1c9de560dSAlex Tomas /* 2c9de560dSAlex Tomas * Copyright (c) 2003-2006, Cluster File Systems, Inc, info@clusterfs.com 3c9de560dSAlex Tomas * Written by Alex Tomas <alex@clusterfs.com> 4c9de560dSAlex Tomas * 5c9de560dSAlex Tomas * This program is free software; you can redistribute it and/or modify 6c9de560dSAlex Tomas * it under the terms of the GNU General Public License version 2 as 7c9de560dSAlex Tomas * published by the Free Software Foundation. 8c9de560dSAlex Tomas * 9c9de560dSAlex Tomas * This program is distributed in the hope that it will be useful, 10c9de560dSAlex Tomas * but WITHOUT ANY WARRANTY; without even the implied warranty of 11c9de560dSAlex Tomas * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12c9de560dSAlex Tomas * GNU General Public License for more details. 13c9de560dSAlex Tomas * 14c9de560dSAlex Tomas * You should have received a copy of the GNU General Public Licens 15c9de560dSAlex Tomas * along with this program; if not, write to the Free Software 16c9de560dSAlex Tomas * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111- 17c9de560dSAlex Tomas */ 18c9de560dSAlex Tomas 19c9de560dSAlex Tomas 20c9de560dSAlex Tomas /* 21c9de560dSAlex Tomas * mballoc.c contains the multiblocks allocation routines 22c9de560dSAlex Tomas */ 23c9de560dSAlex Tomas 2418aadd47SBobi Jam #include "ext4_jbd2.h" 258f6e39a7SMingming Cao #include "mballoc.h" 2628623c2fSTheodore Ts'o #include <linux/log2.h> 27a0b30c12STheodore Ts'o #include <linux/module.h> 285a0e3ad6STejun Heo #include <linux/slab.h> 2966114cadSTejun Heo #include <linux/backing-dev.h> 309bffad1eSTheodore Ts'o #include <trace/events/ext4.h> 319bffad1eSTheodore Ts'o 32a0b30c12STheodore Ts'o #ifdef CONFIG_EXT4_DEBUG 33a0b30c12STheodore Ts'o ushort ext4_mballoc_debug __read_mostly; 34a0b30c12STheodore Ts'o 35a0b30c12STheodore Ts'o module_param_named(mballoc_debug, ext4_mballoc_debug, ushort, 0644); 36a0b30c12STheodore Ts'o MODULE_PARM_DESC(mballoc_debug, "Debugging level for ext4's mballoc"); 37a0b30c12STheodore Ts'o #endif 38a0b30c12STheodore Ts'o 39c9de560dSAlex Tomas /* 40c9de560dSAlex Tomas * MUSTDO: 41c9de560dSAlex Tomas * - test ext4_ext_search_left() and ext4_ext_search_right() 42c9de560dSAlex Tomas * - search for metadata in few groups 43c9de560dSAlex Tomas * 44c9de560dSAlex Tomas * TODO v4: 45c9de560dSAlex Tomas * - normalization should take into account whether file is still open 46c9de560dSAlex Tomas * - discard preallocations if no free space left (policy?) 47c9de560dSAlex Tomas * - don't normalize tails 48c9de560dSAlex Tomas * - quota 49c9de560dSAlex Tomas * - reservation for superuser 50c9de560dSAlex Tomas * 51c9de560dSAlex Tomas * TODO v3: 52c9de560dSAlex Tomas * - bitmap read-ahead (proposed by Oleg Drokin aka green) 53c9de560dSAlex Tomas * - track min/max extents in each group for better group selection 54c9de560dSAlex Tomas * - mb_mark_used() may allocate chunk right after splitting buddy 55c9de560dSAlex Tomas * - tree of groups sorted by number of free blocks 56c9de560dSAlex Tomas * - error handling 57c9de560dSAlex Tomas */ 58c9de560dSAlex Tomas 59c9de560dSAlex Tomas /* 60c9de560dSAlex Tomas * The allocation request involve request for multiple number of blocks 61c9de560dSAlex Tomas * near to the goal(block) value specified. 62c9de560dSAlex Tomas * 63b713a5ecSTheodore Ts'o * During initialization phase of the allocator we decide to use the 64b713a5ecSTheodore Ts'o * group preallocation or inode preallocation depending on the size of 65b713a5ecSTheodore Ts'o * the file. The size of the file could be the resulting file size we 66b713a5ecSTheodore Ts'o * would have after allocation, or the current file size, which ever 67b713a5ecSTheodore Ts'o * is larger. If the size is less than sbi->s_mb_stream_request we 68b713a5ecSTheodore Ts'o * select to use the group preallocation. The default value of 69b713a5ecSTheodore Ts'o * s_mb_stream_request is 16 blocks. This can also be tuned via 70b713a5ecSTheodore Ts'o * /sys/fs/ext4/<partition>/mb_stream_req. The value is represented in 71b713a5ecSTheodore Ts'o * terms of number of blocks. 72c9de560dSAlex Tomas * 73c9de560dSAlex Tomas * The main motivation for having small file use group preallocation is to 74b713a5ecSTheodore Ts'o * ensure that we have small files closer together on the disk. 75c9de560dSAlex Tomas * 76b713a5ecSTheodore Ts'o * First stage the allocator looks at the inode prealloc list, 77b713a5ecSTheodore Ts'o * ext4_inode_info->i_prealloc_list, which contains list of prealloc 78b713a5ecSTheodore Ts'o * spaces for this particular inode. The inode prealloc space is 79b713a5ecSTheodore Ts'o * represented as: 80c9de560dSAlex Tomas * 81c9de560dSAlex Tomas * pa_lstart -> the logical start block for this prealloc space 82c9de560dSAlex Tomas * pa_pstart -> the physical start block for this prealloc space 8353accfa9STheodore Ts'o * pa_len -> length for this prealloc space (in clusters) 8453accfa9STheodore Ts'o * pa_free -> free space available in this prealloc space (in clusters) 85c9de560dSAlex Tomas * 86c9de560dSAlex Tomas * The inode preallocation space is used looking at the _logical_ start 87c9de560dSAlex Tomas * block. If only the logical file block falls within the range of prealloc 88caaf7a29STao Ma * space we will consume the particular prealloc space. This makes sure that 89caaf7a29STao Ma * we have contiguous physical blocks representing the file blocks 90c9de560dSAlex Tomas * 91c9de560dSAlex Tomas * The important thing to be noted in case of inode prealloc space is that 92c9de560dSAlex Tomas * we don't modify the values associated to inode prealloc space except 93c9de560dSAlex Tomas * pa_free. 94c9de560dSAlex Tomas * 95c9de560dSAlex Tomas * If we are not able to find blocks in the inode prealloc space and if we 96c9de560dSAlex Tomas * have the group allocation flag set then we look at the locality group 97caaf7a29STao Ma * prealloc space. These are per CPU prealloc list represented as 98c9de560dSAlex Tomas * 99c9de560dSAlex Tomas * ext4_sb_info.s_locality_groups[smp_processor_id()] 100c9de560dSAlex Tomas * 101c9de560dSAlex Tomas * The reason for having a per cpu locality group is to reduce the contention 102c9de560dSAlex Tomas * between CPUs. It is possible to get scheduled at this point. 103c9de560dSAlex Tomas * 104c9de560dSAlex Tomas * The locality group prealloc space is used looking at whether we have 10525985edcSLucas De Marchi * enough free space (pa_free) within the prealloc space. 106c9de560dSAlex Tomas * 107c9de560dSAlex Tomas * If we can't allocate blocks via inode prealloc or/and locality group 108c9de560dSAlex Tomas * prealloc then we look at the buddy cache. The buddy cache is represented 109c9de560dSAlex Tomas * by ext4_sb_info.s_buddy_cache (struct inode) whose file offset gets 110c9de560dSAlex Tomas * mapped to the buddy and bitmap information regarding different 111c9de560dSAlex Tomas * groups. The buddy information is attached to buddy cache inode so that 112c9de560dSAlex Tomas * we can access them through the page cache. The information regarding 113c9de560dSAlex Tomas * each group is loaded via ext4_mb_load_buddy. The information involve 114c9de560dSAlex Tomas * block bitmap and buddy information. The information are stored in the 115c9de560dSAlex Tomas * inode as: 116c9de560dSAlex Tomas * 117c9de560dSAlex Tomas * { page } 118c3a326a6SAneesh Kumar K.V * [ group 0 bitmap][ group 0 buddy] [group 1][ group 1]... 119c9de560dSAlex Tomas * 120c9de560dSAlex Tomas * 121c9de560dSAlex Tomas * one block each for bitmap and buddy information. So for each group we 122c9de560dSAlex Tomas * take up 2 blocks. A page can contain blocks_per_page (PAGE_CACHE_SIZE / 123c9de560dSAlex Tomas * blocksize) blocks. So it can have information regarding groups_per_page 124c9de560dSAlex Tomas * which is blocks_per_page/2 125c9de560dSAlex Tomas * 126c9de560dSAlex Tomas * The buddy cache inode is not stored on disk. The inode is thrown 127c9de560dSAlex Tomas * away when the filesystem is unmounted. 128c9de560dSAlex Tomas * 129c9de560dSAlex Tomas * We look for count number of blocks in the buddy cache. If we were able 130c9de560dSAlex Tomas * to locate that many free blocks we return with additional information 131c9de560dSAlex Tomas * regarding rest of the contiguous physical block available 132c9de560dSAlex Tomas * 133c9de560dSAlex Tomas * Before allocating blocks via buddy cache we normalize the request 134c9de560dSAlex Tomas * blocks. This ensure we ask for more blocks that we needed. The extra 135c9de560dSAlex Tomas * blocks that we get after allocation is added to the respective prealloc 136c9de560dSAlex Tomas * list. In case of inode preallocation we follow a list of heuristics 137c9de560dSAlex Tomas * based on file size. This can be found in ext4_mb_normalize_request. If 138c9de560dSAlex Tomas * we are doing a group prealloc we try to normalize the request to 13927baebb8STheodore Ts'o * sbi->s_mb_group_prealloc. The default value of s_mb_group_prealloc is 14027baebb8STheodore Ts'o * dependent on the cluster size; for non-bigalloc file systems, it is 141c9de560dSAlex Tomas * 512 blocks. This can be tuned via 142d7a1fee1SDan Ehrenberg * /sys/fs/ext4/<partition>/mb_group_prealloc. The value is represented in 143c9de560dSAlex Tomas * terms of number of blocks. If we have mounted the file system with -O 144c9de560dSAlex Tomas * stripe=<value> option the group prealloc request is normalized to the 145d7a1fee1SDan Ehrenberg * the smallest multiple of the stripe value (sbi->s_stripe) which is 146d7a1fee1SDan Ehrenberg * greater than the default mb_group_prealloc. 147c9de560dSAlex Tomas * 148d7a1fee1SDan Ehrenberg * The regular allocator (using the buddy cache) supports a few tunables. 149c9de560dSAlex Tomas * 150b713a5ecSTheodore Ts'o * /sys/fs/ext4/<partition>/mb_min_to_scan 151b713a5ecSTheodore Ts'o * /sys/fs/ext4/<partition>/mb_max_to_scan 152b713a5ecSTheodore Ts'o * /sys/fs/ext4/<partition>/mb_order2_req 153c9de560dSAlex Tomas * 154b713a5ecSTheodore Ts'o * The regular allocator uses buddy scan only if the request len is power of 155c9de560dSAlex Tomas * 2 blocks and the order of allocation is >= sbi->s_mb_order2_reqs. The 156c9de560dSAlex Tomas * value of s_mb_order2_reqs can be tuned via 157b713a5ecSTheodore Ts'o * /sys/fs/ext4/<partition>/mb_order2_req. If the request len is equal to 158af901ca1SAndré Goddard Rosa * stripe size (sbi->s_stripe), we try to search for contiguous block in 159b713a5ecSTheodore Ts'o * stripe size. This should result in better allocation on RAID setups. If 160b713a5ecSTheodore Ts'o * not, we search in the specific group using bitmap for best extents. The 161b713a5ecSTheodore Ts'o * tunable min_to_scan and max_to_scan control the behaviour here. 162c9de560dSAlex Tomas * min_to_scan indicate how long the mballoc __must__ look for a best 163b713a5ecSTheodore Ts'o * extent and max_to_scan indicates how long the mballoc __can__ look for a 164c9de560dSAlex Tomas * best extent in the found extents. Searching for the blocks starts with 165c9de560dSAlex Tomas * the group specified as the goal value in allocation context via 166c9de560dSAlex Tomas * ac_g_ex. Each group is first checked based on the criteria whether it 167caaf7a29STao Ma * can be used for allocation. ext4_mb_good_group explains how the groups are 168c9de560dSAlex Tomas * checked. 169c9de560dSAlex Tomas * 170c9de560dSAlex Tomas * Both the prealloc space are getting populated as above. So for the first 171c9de560dSAlex Tomas * request we will hit the buddy cache which will result in this prealloc 172c9de560dSAlex Tomas * space getting filled. The prealloc space is then later used for the 173c9de560dSAlex Tomas * subsequent request. 174c9de560dSAlex Tomas */ 175c9de560dSAlex Tomas 176c9de560dSAlex Tomas /* 177c9de560dSAlex Tomas * mballoc operates on the following data: 178c9de560dSAlex Tomas * - on-disk bitmap 179c9de560dSAlex Tomas * - in-core buddy (actually includes buddy and bitmap) 180c9de560dSAlex Tomas * - preallocation descriptors (PAs) 181c9de560dSAlex Tomas * 182c9de560dSAlex Tomas * there are two types of preallocations: 183c9de560dSAlex Tomas * - inode 184c9de560dSAlex Tomas * assiged to specific inode and can be used for this inode only. 185c9de560dSAlex Tomas * it describes part of inode's space preallocated to specific 186c9de560dSAlex Tomas * physical blocks. any block from that preallocated can be used 187c9de560dSAlex Tomas * independent. the descriptor just tracks number of blocks left 188c9de560dSAlex Tomas * unused. so, before taking some block from descriptor, one must 189c9de560dSAlex Tomas * make sure corresponded logical block isn't allocated yet. this 190c9de560dSAlex Tomas * also means that freeing any block within descriptor's range 191c9de560dSAlex Tomas * must discard all preallocated blocks. 192c9de560dSAlex Tomas * - locality group 193c9de560dSAlex Tomas * assigned to specific locality group which does not translate to 194c9de560dSAlex Tomas * permanent set of inodes: inode can join and leave group. space 195c9de560dSAlex Tomas * from this type of preallocation can be used for any inode. thus 196c9de560dSAlex Tomas * it's consumed from the beginning to the end. 197c9de560dSAlex Tomas * 198c9de560dSAlex Tomas * relation between them can be expressed as: 199c9de560dSAlex Tomas * in-core buddy = on-disk bitmap + preallocation descriptors 200c9de560dSAlex Tomas * 201c9de560dSAlex Tomas * this mean blocks mballoc considers used are: 202c9de560dSAlex Tomas * - allocated blocks (persistent) 203c9de560dSAlex Tomas * - preallocated blocks (non-persistent) 204c9de560dSAlex Tomas * 205c9de560dSAlex Tomas * consistency in mballoc world means that at any time a block is either 206c9de560dSAlex Tomas * free or used in ALL structures. notice: "any time" should not be read 207c9de560dSAlex Tomas * literally -- time is discrete and delimited by locks. 208c9de560dSAlex Tomas * 209c9de560dSAlex Tomas * to keep it simple, we don't use block numbers, instead we count number of 210c9de560dSAlex Tomas * blocks: how many blocks marked used/free in on-disk bitmap, buddy and PA. 211c9de560dSAlex Tomas * 212c9de560dSAlex Tomas * all operations can be expressed as: 213c9de560dSAlex Tomas * - init buddy: buddy = on-disk + PAs 214c9de560dSAlex Tomas * - new PA: buddy += N; PA = N 215c9de560dSAlex Tomas * - use inode PA: on-disk += N; PA -= N 216c9de560dSAlex Tomas * - discard inode PA buddy -= on-disk - PA; PA = 0 217c9de560dSAlex Tomas * - use locality group PA on-disk += N; PA -= N 218c9de560dSAlex Tomas * - discard locality group PA buddy -= PA; PA = 0 219c9de560dSAlex Tomas * note: 'buddy -= on-disk - PA' is used to show that on-disk bitmap 220c9de560dSAlex Tomas * is used in real operation because we can't know actual used 221c9de560dSAlex Tomas * bits from PA, only from on-disk bitmap 222c9de560dSAlex Tomas * 223c9de560dSAlex Tomas * if we follow this strict logic, then all operations above should be atomic. 224c9de560dSAlex Tomas * given some of them can block, we'd have to use something like semaphores 225c9de560dSAlex Tomas * killing performance on high-end SMP hardware. let's try to relax it using 226c9de560dSAlex Tomas * the following knowledge: 227c9de560dSAlex Tomas * 1) if buddy is referenced, it's already initialized 228c9de560dSAlex Tomas * 2) while block is used in buddy and the buddy is referenced, 229c9de560dSAlex Tomas * nobody can re-allocate that block 230c9de560dSAlex Tomas * 3) we work on bitmaps and '+' actually means 'set bits'. if on-disk has 231c9de560dSAlex Tomas * bit set and PA claims same block, it's OK. IOW, one can set bit in 232c9de560dSAlex Tomas * on-disk bitmap if buddy has same bit set or/and PA covers corresponded 233c9de560dSAlex Tomas * block 234c9de560dSAlex Tomas * 235c9de560dSAlex Tomas * so, now we're building a concurrency table: 236c9de560dSAlex Tomas * - init buddy vs. 237c9de560dSAlex Tomas * - new PA 238c9de560dSAlex Tomas * blocks for PA are allocated in the buddy, buddy must be referenced 239c9de560dSAlex Tomas * until PA is linked to allocation group to avoid concurrent buddy init 240c9de560dSAlex Tomas * - use inode PA 241c9de560dSAlex Tomas * we need to make sure that either on-disk bitmap or PA has uptodate data 242c9de560dSAlex Tomas * given (3) we care that PA-=N operation doesn't interfere with init 243c9de560dSAlex Tomas * - discard inode PA 244c9de560dSAlex Tomas * the simplest way would be to have buddy initialized by the discard 245c9de560dSAlex Tomas * - use locality group PA 246c9de560dSAlex Tomas * again PA-=N must be serialized with init 247c9de560dSAlex Tomas * - discard locality group PA 248c9de560dSAlex Tomas * the simplest way would be to have buddy initialized by the discard 249c9de560dSAlex Tomas * - new PA vs. 250c9de560dSAlex Tomas * - use inode PA 251c9de560dSAlex Tomas * i_data_sem serializes them 252c9de560dSAlex Tomas * - discard inode PA 253c9de560dSAlex Tomas * discard process must wait until PA isn't used by another process 254c9de560dSAlex Tomas * - use locality group PA 255c9de560dSAlex Tomas * some mutex should serialize them 256c9de560dSAlex Tomas * - discard locality group PA 257c9de560dSAlex Tomas * discard process must wait until PA isn't used by another process 258c9de560dSAlex Tomas * - use inode PA 259c9de560dSAlex Tomas * - use inode PA 260c9de560dSAlex Tomas * i_data_sem or another mutex should serializes them 261c9de560dSAlex Tomas * - discard inode PA 262c9de560dSAlex Tomas * discard process must wait until PA isn't used by another process 263c9de560dSAlex Tomas * - use locality group PA 264c9de560dSAlex Tomas * nothing wrong here -- they're different PAs covering different blocks 265c9de560dSAlex Tomas * - discard locality group PA 266c9de560dSAlex Tomas * discard process must wait until PA isn't used by another process 267c9de560dSAlex Tomas * 268c9de560dSAlex Tomas * now we're ready to make few consequences: 269c9de560dSAlex Tomas * - PA is referenced and while it is no discard is possible 270c9de560dSAlex Tomas * - PA is referenced until block isn't marked in on-disk bitmap 271c9de560dSAlex Tomas * - PA changes only after on-disk bitmap 272c9de560dSAlex Tomas * - discard must not compete with init. either init is done before 273c9de560dSAlex Tomas * any discard or they're serialized somehow 274c9de560dSAlex Tomas * - buddy init as sum of on-disk bitmap and PAs is done atomically 275c9de560dSAlex Tomas * 276c9de560dSAlex Tomas * a special case when we've used PA to emptiness. no need to modify buddy 277c9de560dSAlex Tomas * in this case, but we should care about concurrent init 278c9de560dSAlex Tomas * 279c9de560dSAlex Tomas */ 280c9de560dSAlex Tomas 281c9de560dSAlex Tomas /* 282c9de560dSAlex Tomas * Logic in few words: 283c9de560dSAlex Tomas * 284c9de560dSAlex Tomas * - allocation: 285c9de560dSAlex Tomas * load group 286c9de560dSAlex Tomas * find blocks 287c9de560dSAlex Tomas * mark bits in on-disk bitmap 288c9de560dSAlex Tomas * release group 289c9de560dSAlex Tomas * 290c9de560dSAlex Tomas * - use preallocation: 291c9de560dSAlex Tomas * find proper PA (per-inode or group) 292c9de560dSAlex Tomas * load group 293c9de560dSAlex Tomas * mark bits in on-disk bitmap 294c9de560dSAlex Tomas * release group 295c9de560dSAlex Tomas * release PA 296c9de560dSAlex Tomas * 297c9de560dSAlex Tomas * - free: 298c9de560dSAlex Tomas * load group 299c9de560dSAlex Tomas * mark bits in on-disk bitmap 300c9de560dSAlex Tomas * release group 301c9de560dSAlex Tomas * 302c9de560dSAlex Tomas * - discard preallocations in group: 303c9de560dSAlex Tomas * mark PAs deleted 304c9de560dSAlex Tomas * move them onto local list 305c9de560dSAlex Tomas * load on-disk bitmap 306c9de560dSAlex Tomas * load group 307c9de560dSAlex Tomas * remove PA from object (inode or locality group) 308c9de560dSAlex Tomas * mark free blocks in-core 309c9de560dSAlex Tomas * 310c9de560dSAlex Tomas * - discard inode's preallocations: 311c9de560dSAlex Tomas */ 312c9de560dSAlex Tomas 313c9de560dSAlex Tomas /* 314c9de560dSAlex Tomas * Locking rules 315c9de560dSAlex Tomas * 316c9de560dSAlex Tomas * Locks: 317c9de560dSAlex Tomas * - bitlock on a group (group) 318c9de560dSAlex Tomas * - object (inode/locality) (object) 319c9de560dSAlex Tomas * - per-pa lock (pa) 320c9de560dSAlex Tomas * 321c9de560dSAlex Tomas * Paths: 322c9de560dSAlex Tomas * - new pa 323c9de560dSAlex Tomas * object 324c9de560dSAlex Tomas * group 325c9de560dSAlex Tomas * 326c9de560dSAlex Tomas * - find and use pa: 327c9de560dSAlex Tomas * pa 328c9de560dSAlex Tomas * 329c9de560dSAlex Tomas * - release consumed pa: 330c9de560dSAlex Tomas * pa 331c9de560dSAlex Tomas * group 332c9de560dSAlex Tomas * object 333c9de560dSAlex Tomas * 334c9de560dSAlex Tomas * - generate in-core bitmap: 335c9de560dSAlex Tomas * group 336c9de560dSAlex Tomas * pa 337c9de560dSAlex Tomas * 338c9de560dSAlex Tomas * - discard all for given object (inode, locality group): 339c9de560dSAlex Tomas * object 340c9de560dSAlex Tomas * pa 341c9de560dSAlex Tomas * group 342c9de560dSAlex Tomas * 343c9de560dSAlex Tomas * - discard all for given group: 344c9de560dSAlex Tomas * group 345c9de560dSAlex Tomas * pa 346c9de560dSAlex Tomas * group 347c9de560dSAlex Tomas * object 348c9de560dSAlex Tomas * 349c9de560dSAlex Tomas */ 350c3a326a6SAneesh Kumar K.V static struct kmem_cache *ext4_pspace_cachep; 351c3a326a6SAneesh Kumar K.V static struct kmem_cache *ext4_ac_cachep; 35218aadd47SBobi Jam static struct kmem_cache *ext4_free_data_cachep; 353fb1813f4SCurt Wohlgemuth 354fb1813f4SCurt Wohlgemuth /* We create slab caches for groupinfo data structures based on the 355fb1813f4SCurt Wohlgemuth * superblock block size. There will be one per mounted filesystem for 356fb1813f4SCurt Wohlgemuth * each unique s_blocksize_bits */ 3572892c15dSEric Sandeen #define NR_GRPINFO_CACHES 8 358fb1813f4SCurt Wohlgemuth static struct kmem_cache *ext4_groupinfo_caches[NR_GRPINFO_CACHES]; 359fb1813f4SCurt Wohlgemuth 3602892c15dSEric Sandeen static const char *ext4_groupinfo_slab_names[NR_GRPINFO_CACHES] = { 3612892c15dSEric Sandeen "ext4_groupinfo_1k", "ext4_groupinfo_2k", "ext4_groupinfo_4k", 3622892c15dSEric Sandeen "ext4_groupinfo_8k", "ext4_groupinfo_16k", "ext4_groupinfo_32k", 3632892c15dSEric Sandeen "ext4_groupinfo_64k", "ext4_groupinfo_128k" 3642892c15dSEric Sandeen }; 3652892c15dSEric Sandeen 366c3a326a6SAneesh Kumar K.V static void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap, 367c3a326a6SAneesh Kumar K.V ext4_group_t group); 3687a2fcbf7SAneesh Kumar K.V static void ext4_mb_generate_from_freelist(struct super_block *sb, void *bitmap, 3697a2fcbf7SAneesh Kumar K.V ext4_group_t group); 37018aadd47SBobi Jam static void ext4_free_data_callback(struct super_block *sb, 37118aadd47SBobi Jam struct ext4_journal_cb_entry *jce, int rc); 372c3a326a6SAneesh Kumar K.V 373ffad0a44SAneesh Kumar K.V static inline void *mb_correct_addr_and_bit(int *bit, void *addr) 374ffad0a44SAneesh Kumar K.V { 375c9de560dSAlex Tomas #if BITS_PER_LONG == 64 376ffad0a44SAneesh Kumar K.V *bit += ((unsigned long) addr & 7UL) << 3; 377ffad0a44SAneesh Kumar K.V addr = (void *) ((unsigned long) addr & ~7UL); 378c9de560dSAlex Tomas #elif BITS_PER_LONG == 32 379ffad0a44SAneesh Kumar K.V *bit += ((unsigned long) addr & 3UL) << 3; 380ffad0a44SAneesh Kumar K.V addr = (void *) ((unsigned long) addr & ~3UL); 381c9de560dSAlex Tomas #else 382c9de560dSAlex Tomas #error "how many bits you are?!" 383c9de560dSAlex Tomas #endif 384ffad0a44SAneesh Kumar K.V return addr; 385ffad0a44SAneesh Kumar K.V } 386c9de560dSAlex Tomas 387c9de560dSAlex Tomas static inline int mb_test_bit(int bit, void *addr) 388c9de560dSAlex Tomas { 389c9de560dSAlex Tomas /* 390c9de560dSAlex Tomas * ext4_test_bit on architecture like powerpc 391c9de560dSAlex Tomas * needs unsigned long aligned address 392c9de560dSAlex Tomas */ 393ffad0a44SAneesh Kumar K.V addr = mb_correct_addr_and_bit(&bit, addr); 394c9de560dSAlex Tomas return ext4_test_bit(bit, addr); 395c9de560dSAlex Tomas } 396c9de560dSAlex Tomas 397c9de560dSAlex Tomas static inline void mb_set_bit(int bit, void *addr) 398c9de560dSAlex Tomas { 399ffad0a44SAneesh Kumar K.V addr = mb_correct_addr_and_bit(&bit, addr); 400c9de560dSAlex Tomas ext4_set_bit(bit, addr); 401c9de560dSAlex Tomas } 402c9de560dSAlex Tomas 403c9de560dSAlex Tomas static inline void mb_clear_bit(int bit, void *addr) 404c9de560dSAlex Tomas { 405ffad0a44SAneesh Kumar K.V addr = mb_correct_addr_and_bit(&bit, addr); 406c9de560dSAlex Tomas ext4_clear_bit(bit, addr); 407c9de560dSAlex Tomas } 408c9de560dSAlex Tomas 409eabe0444SAndrey Sidorov static inline int mb_test_and_clear_bit(int bit, void *addr) 410eabe0444SAndrey Sidorov { 411eabe0444SAndrey Sidorov addr = mb_correct_addr_and_bit(&bit, addr); 412eabe0444SAndrey Sidorov return ext4_test_and_clear_bit(bit, addr); 413eabe0444SAndrey Sidorov } 414eabe0444SAndrey Sidorov 415ffad0a44SAneesh Kumar K.V static inline int mb_find_next_zero_bit(void *addr, int max, int start) 416ffad0a44SAneesh Kumar K.V { 417e7dfb246SAneesh Kumar K.V int fix = 0, ret, tmpmax; 418ffad0a44SAneesh Kumar K.V addr = mb_correct_addr_and_bit(&fix, addr); 419e7dfb246SAneesh Kumar K.V tmpmax = max + fix; 420ffad0a44SAneesh Kumar K.V start += fix; 421ffad0a44SAneesh Kumar K.V 422e7dfb246SAneesh Kumar K.V ret = ext4_find_next_zero_bit(addr, tmpmax, start) - fix; 423e7dfb246SAneesh Kumar K.V if (ret > max) 424e7dfb246SAneesh Kumar K.V return max; 425e7dfb246SAneesh Kumar K.V return ret; 426ffad0a44SAneesh Kumar K.V } 427ffad0a44SAneesh Kumar K.V 428ffad0a44SAneesh Kumar K.V static inline int mb_find_next_bit(void *addr, int max, int start) 429ffad0a44SAneesh Kumar K.V { 430e7dfb246SAneesh Kumar K.V int fix = 0, ret, tmpmax; 431ffad0a44SAneesh Kumar K.V addr = mb_correct_addr_and_bit(&fix, addr); 432e7dfb246SAneesh Kumar K.V tmpmax = max + fix; 433ffad0a44SAneesh Kumar K.V start += fix; 434ffad0a44SAneesh Kumar K.V 435e7dfb246SAneesh Kumar K.V ret = ext4_find_next_bit(addr, tmpmax, start) - fix; 436e7dfb246SAneesh Kumar K.V if (ret > max) 437e7dfb246SAneesh Kumar K.V return max; 438e7dfb246SAneesh Kumar K.V return ret; 439ffad0a44SAneesh Kumar K.V } 440ffad0a44SAneesh Kumar K.V 441c9de560dSAlex Tomas static void *mb_find_buddy(struct ext4_buddy *e4b, int order, int *max) 442c9de560dSAlex Tomas { 443c9de560dSAlex Tomas char *bb; 444c9de560dSAlex Tomas 445c5e8f3f3STheodore Ts'o BUG_ON(e4b->bd_bitmap == e4b->bd_buddy); 446c9de560dSAlex Tomas BUG_ON(max == NULL); 447c9de560dSAlex Tomas 448c9de560dSAlex Tomas if (order > e4b->bd_blkbits + 1) { 449c9de560dSAlex Tomas *max = 0; 450c9de560dSAlex Tomas return NULL; 451c9de560dSAlex Tomas } 452c9de560dSAlex Tomas 453c9de560dSAlex Tomas /* at order 0 we see each particular block */ 45484b775a3SColy Li if (order == 0) { 455c9de560dSAlex Tomas *max = 1 << (e4b->bd_blkbits + 3); 456c5e8f3f3STheodore Ts'o return e4b->bd_bitmap; 45784b775a3SColy Li } 458c9de560dSAlex Tomas 459c5e8f3f3STheodore Ts'o bb = e4b->bd_buddy + EXT4_SB(e4b->bd_sb)->s_mb_offsets[order]; 460c9de560dSAlex Tomas *max = EXT4_SB(e4b->bd_sb)->s_mb_maxs[order]; 461c9de560dSAlex Tomas 462c9de560dSAlex Tomas return bb; 463c9de560dSAlex Tomas } 464c9de560dSAlex Tomas 465c9de560dSAlex Tomas #ifdef DOUBLE_CHECK 466c9de560dSAlex Tomas static void mb_free_blocks_double(struct inode *inode, struct ext4_buddy *e4b, 467c9de560dSAlex Tomas int first, int count) 468c9de560dSAlex Tomas { 469c9de560dSAlex Tomas int i; 470c9de560dSAlex Tomas struct super_block *sb = e4b->bd_sb; 471c9de560dSAlex Tomas 472c9de560dSAlex Tomas if (unlikely(e4b->bd_info->bb_bitmap == NULL)) 473c9de560dSAlex Tomas return; 474bc8e6740SVincent Minet assert_spin_locked(ext4_group_lock_ptr(sb, e4b->bd_group)); 475c9de560dSAlex Tomas for (i = 0; i < count; i++) { 476c9de560dSAlex Tomas if (!mb_test_bit(first + i, e4b->bd_info->bb_bitmap)) { 477c9de560dSAlex Tomas ext4_fsblk_t blocknr; 4785661bd68SAkinobu Mita 4795661bd68SAkinobu Mita blocknr = ext4_group_first_block_no(sb, e4b->bd_group); 48053accfa9STheodore Ts'o blocknr += EXT4_C2B(EXT4_SB(sb), first + i); 4815d1b1b3fSAneesh Kumar K.V ext4_grp_locked_error(sb, e4b->bd_group, 482e29136f8STheodore Ts'o inode ? inode->i_ino : 0, 483e29136f8STheodore Ts'o blocknr, 484e29136f8STheodore Ts'o "freeing block already freed " 485e29136f8STheodore Ts'o "(bit %u)", 486e29136f8STheodore Ts'o first + i); 487c9de560dSAlex Tomas } 488c9de560dSAlex Tomas mb_clear_bit(first + i, e4b->bd_info->bb_bitmap); 489c9de560dSAlex Tomas } 490c9de560dSAlex Tomas } 491c9de560dSAlex Tomas 492c9de560dSAlex Tomas static void mb_mark_used_double(struct ext4_buddy *e4b, int first, int count) 493c9de560dSAlex Tomas { 494c9de560dSAlex Tomas int i; 495c9de560dSAlex Tomas 496c9de560dSAlex Tomas if (unlikely(e4b->bd_info->bb_bitmap == NULL)) 497c9de560dSAlex Tomas return; 498bc8e6740SVincent Minet assert_spin_locked(ext4_group_lock_ptr(e4b->bd_sb, e4b->bd_group)); 499c9de560dSAlex Tomas for (i = 0; i < count; i++) { 500c9de560dSAlex Tomas BUG_ON(mb_test_bit(first + i, e4b->bd_info->bb_bitmap)); 501c9de560dSAlex Tomas mb_set_bit(first + i, e4b->bd_info->bb_bitmap); 502c9de560dSAlex Tomas } 503c9de560dSAlex Tomas } 504c9de560dSAlex Tomas 505c9de560dSAlex Tomas static void mb_cmp_bitmaps(struct ext4_buddy *e4b, void *bitmap) 506c9de560dSAlex Tomas { 507c9de560dSAlex Tomas if (memcmp(e4b->bd_info->bb_bitmap, bitmap, e4b->bd_sb->s_blocksize)) { 508c9de560dSAlex Tomas unsigned char *b1, *b2; 509c9de560dSAlex Tomas int i; 510c9de560dSAlex Tomas b1 = (unsigned char *) e4b->bd_info->bb_bitmap; 511c9de560dSAlex Tomas b2 = (unsigned char *) bitmap; 512c9de560dSAlex Tomas for (i = 0; i < e4b->bd_sb->s_blocksize; i++) { 513c9de560dSAlex Tomas if (b1[i] != b2[i]) { 5149d8b9ec4STheodore Ts'o ext4_msg(e4b->bd_sb, KERN_ERR, 5159d8b9ec4STheodore Ts'o "corruption in group %u " 5164776004fSTheodore Ts'o "at byte %u(%u): %x in copy != %x " 5179d8b9ec4STheodore Ts'o "on disk/prealloc", 518c9de560dSAlex Tomas e4b->bd_group, i, i * 8, b1[i], b2[i]); 519c9de560dSAlex Tomas BUG(); 520c9de560dSAlex Tomas } 521c9de560dSAlex Tomas } 522c9de560dSAlex Tomas } 523c9de560dSAlex Tomas } 524c9de560dSAlex Tomas 525c9de560dSAlex Tomas #else 526c9de560dSAlex Tomas static inline void mb_free_blocks_double(struct inode *inode, 527c9de560dSAlex Tomas struct ext4_buddy *e4b, int first, int count) 528c9de560dSAlex Tomas { 529c9de560dSAlex Tomas return; 530c9de560dSAlex Tomas } 531c9de560dSAlex Tomas static inline void mb_mark_used_double(struct ext4_buddy *e4b, 532c9de560dSAlex Tomas int first, int count) 533c9de560dSAlex Tomas { 534c9de560dSAlex Tomas return; 535c9de560dSAlex Tomas } 536c9de560dSAlex Tomas static inline void mb_cmp_bitmaps(struct ext4_buddy *e4b, void *bitmap) 537c9de560dSAlex Tomas { 538c9de560dSAlex Tomas return; 539c9de560dSAlex Tomas } 540c9de560dSAlex Tomas #endif 541c9de560dSAlex Tomas 542c9de560dSAlex Tomas #ifdef AGGRESSIVE_CHECK 543c9de560dSAlex Tomas 544c9de560dSAlex Tomas #define MB_CHECK_ASSERT(assert) \ 545c9de560dSAlex Tomas do { \ 546c9de560dSAlex Tomas if (!(assert)) { \ 547c9de560dSAlex Tomas printk(KERN_EMERG \ 548c9de560dSAlex Tomas "Assertion failure in %s() at %s:%d: \"%s\"\n", \ 549c9de560dSAlex Tomas function, file, line, # assert); \ 550c9de560dSAlex Tomas BUG(); \ 551c9de560dSAlex Tomas } \ 552c9de560dSAlex Tomas } while (0) 553c9de560dSAlex Tomas 554c9de560dSAlex Tomas static int __mb_check_buddy(struct ext4_buddy *e4b, char *file, 555c9de560dSAlex Tomas const char *function, int line) 556c9de560dSAlex Tomas { 557c9de560dSAlex Tomas struct super_block *sb = e4b->bd_sb; 558c9de560dSAlex Tomas int order = e4b->bd_blkbits + 1; 559c9de560dSAlex Tomas int max; 560c9de560dSAlex Tomas int max2; 561c9de560dSAlex Tomas int i; 562c9de560dSAlex Tomas int j; 563c9de560dSAlex Tomas int k; 564c9de560dSAlex Tomas int count; 565c9de560dSAlex Tomas struct ext4_group_info *grp; 566c9de560dSAlex Tomas int fragments = 0; 567c9de560dSAlex Tomas int fstart; 568c9de560dSAlex Tomas struct list_head *cur; 569c9de560dSAlex Tomas void *buddy; 570c9de560dSAlex Tomas void *buddy2; 571c9de560dSAlex Tomas 572c9de560dSAlex Tomas { 573c9de560dSAlex Tomas static int mb_check_counter; 574c9de560dSAlex Tomas if (mb_check_counter++ % 100 != 0) 575c9de560dSAlex Tomas return 0; 576c9de560dSAlex Tomas } 577c9de560dSAlex Tomas 578c9de560dSAlex Tomas while (order > 1) { 579c9de560dSAlex Tomas buddy = mb_find_buddy(e4b, order, &max); 580c9de560dSAlex Tomas MB_CHECK_ASSERT(buddy); 581c9de560dSAlex Tomas buddy2 = mb_find_buddy(e4b, order - 1, &max2); 582c9de560dSAlex Tomas MB_CHECK_ASSERT(buddy2); 583c9de560dSAlex Tomas MB_CHECK_ASSERT(buddy != buddy2); 584c9de560dSAlex Tomas MB_CHECK_ASSERT(max * 2 == max2); 585c9de560dSAlex Tomas 586c9de560dSAlex Tomas count = 0; 587c9de560dSAlex Tomas for (i = 0; i < max; i++) { 588c9de560dSAlex Tomas 589c9de560dSAlex Tomas if (mb_test_bit(i, buddy)) { 590c9de560dSAlex Tomas /* only single bit in buddy2 may be 1 */ 591c9de560dSAlex Tomas if (!mb_test_bit(i << 1, buddy2)) { 592c9de560dSAlex Tomas MB_CHECK_ASSERT( 593c9de560dSAlex Tomas mb_test_bit((i<<1)+1, buddy2)); 594c9de560dSAlex Tomas } else if (!mb_test_bit((i << 1) + 1, buddy2)) { 595c9de560dSAlex Tomas MB_CHECK_ASSERT( 596c9de560dSAlex Tomas mb_test_bit(i << 1, buddy2)); 597c9de560dSAlex Tomas } 598c9de560dSAlex Tomas continue; 599c9de560dSAlex Tomas } 600c9de560dSAlex Tomas 6010a10da73SRobin Dong /* both bits in buddy2 must be 1 */ 602c9de560dSAlex Tomas MB_CHECK_ASSERT(mb_test_bit(i << 1, buddy2)); 603c9de560dSAlex Tomas MB_CHECK_ASSERT(mb_test_bit((i << 1) + 1, buddy2)); 604c9de560dSAlex Tomas 605c9de560dSAlex Tomas for (j = 0; j < (1 << order); j++) { 606c9de560dSAlex Tomas k = (i * (1 << order)) + j; 607c9de560dSAlex Tomas MB_CHECK_ASSERT( 608c5e8f3f3STheodore Ts'o !mb_test_bit(k, e4b->bd_bitmap)); 609c9de560dSAlex Tomas } 610c9de560dSAlex Tomas count++; 611c9de560dSAlex Tomas } 612c9de560dSAlex Tomas MB_CHECK_ASSERT(e4b->bd_info->bb_counters[order] == count); 613c9de560dSAlex Tomas order--; 614c9de560dSAlex Tomas } 615c9de560dSAlex Tomas 616c9de560dSAlex Tomas fstart = -1; 617c9de560dSAlex Tomas buddy = mb_find_buddy(e4b, 0, &max); 618c9de560dSAlex Tomas for (i = 0; i < max; i++) { 619c9de560dSAlex Tomas if (!mb_test_bit(i, buddy)) { 620c9de560dSAlex Tomas MB_CHECK_ASSERT(i >= e4b->bd_info->bb_first_free); 621c9de560dSAlex Tomas if (fstart == -1) { 622c9de560dSAlex Tomas fragments++; 623c9de560dSAlex Tomas fstart = i; 624c9de560dSAlex Tomas } 625c9de560dSAlex Tomas continue; 626c9de560dSAlex Tomas } 627c9de560dSAlex Tomas fstart = -1; 628c9de560dSAlex Tomas /* check used bits only */ 629c9de560dSAlex Tomas for (j = 0; j < e4b->bd_blkbits + 1; j++) { 630c9de560dSAlex Tomas buddy2 = mb_find_buddy(e4b, j, &max2); 631c9de560dSAlex Tomas k = i >> j; 632c9de560dSAlex Tomas MB_CHECK_ASSERT(k < max2); 633c9de560dSAlex Tomas MB_CHECK_ASSERT(mb_test_bit(k, buddy2)); 634c9de560dSAlex Tomas } 635c9de560dSAlex Tomas } 636c9de560dSAlex Tomas MB_CHECK_ASSERT(!EXT4_MB_GRP_NEED_INIT(e4b->bd_info)); 637c9de560dSAlex Tomas MB_CHECK_ASSERT(e4b->bd_info->bb_fragments == fragments); 638c9de560dSAlex Tomas 639c9de560dSAlex Tomas grp = ext4_get_group_info(sb, e4b->bd_group); 640c9de560dSAlex Tomas list_for_each(cur, &grp->bb_prealloc_list) { 641c9de560dSAlex Tomas ext4_group_t groupnr; 642c9de560dSAlex Tomas struct ext4_prealloc_space *pa; 64360bd63d1SSolofo Ramangalahy pa = list_entry(cur, struct ext4_prealloc_space, pa_group_list); 64460bd63d1SSolofo Ramangalahy ext4_get_group_no_and_offset(sb, pa->pa_pstart, &groupnr, &k); 645c9de560dSAlex Tomas MB_CHECK_ASSERT(groupnr == e4b->bd_group); 64660bd63d1SSolofo Ramangalahy for (i = 0; i < pa->pa_len; i++) 647c9de560dSAlex Tomas MB_CHECK_ASSERT(mb_test_bit(k + i, buddy)); 648c9de560dSAlex Tomas } 649c9de560dSAlex Tomas return 0; 650c9de560dSAlex Tomas } 651c9de560dSAlex Tomas #undef MB_CHECK_ASSERT 652c9de560dSAlex Tomas #define mb_check_buddy(e4b) __mb_check_buddy(e4b, \ 65346e665e9SHarvey Harrison __FILE__, __func__, __LINE__) 654c9de560dSAlex Tomas #else 655c9de560dSAlex Tomas #define mb_check_buddy(e4b) 656c9de560dSAlex Tomas #endif 657c9de560dSAlex Tomas 6587c786059SColy Li /* 6597c786059SColy Li * Divide blocks started from @first with length @len into 6607c786059SColy Li * smaller chunks with power of 2 blocks. 6617c786059SColy Li * Clear the bits in bitmap which the blocks of the chunk(s) covered, 6627c786059SColy Li * then increase bb_counters[] for corresponded chunk size. 6637c786059SColy Li */ 664c9de560dSAlex Tomas static void ext4_mb_mark_free_simple(struct super_block *sb, 665a36b4498SEric Sandeen void *buddy, ext4_grpblk_t first, ext4_grpblk_t len, 666c9de560dSAlex Tomas struct ext4_group_info *grp) 667c9de560dSAlex Tomas { 668c9de560dSAlex Tomas struct ext4_sb_info *sbi = EXT4_SB(sb); 669a36b4498SEric Sandeen ext4_grpblk_t min; 670a36b4498SEric Sandeen ext4_grpblk_t max; 671a36b4498SEric Sandeen ext4_grpblk_t chunk; 672c9de560dSAlex Tomas unsigned short border; 673c9de560dSAlex Tomas 6747137d7a4STheodore Ts'o BUG_ON(len > EXT4_CLUSTERS_PER_GROUP(sb)); 675c9de560dSAlex Tomas 676c9de560dSAlex Tomas border = 2 << sb->s_blocksize_bits; 677c9de560dSAlex Tomas 678c9de560dSAlex Tomas while (len > 0) { 679c9de560dSAlex Tomas /* find how many blocks can be covered since this position */ 680c9de560dSAlex Tomas max = ffs(first | border) - 1; 681c9de560dSAlex Tomas 682c9de560dSAlex Tomas /* find how many blocks of power 2 we need to mark */ 683c9de560dSAlex Tomas min = fls(len) - 1; 684c9de560dSAlex Tomas 685c9de560dSAlex Tomas if (max < min) 686c9de560dSAlex Tomas min = max; 687c9de560dSAlex Tomas chunk = 1 << min; 688c9de560dSAlex Tomas 689c9de560dSAlex Tomas /* mark multiblock chunks only */ 690c9de560dSAlex Tomas grp->bb_counters[min]++; 691c9de560dSAlex Tomas if (min > 0) 692c9de560dSAlex Tomas mb_clear_bit(first >> min, 693c9de560dSAlex Tomas buddy + sbi->s_mb_offsets[min]); 694c9de560dSAlex Tomas 695c9de560dSAlex Tomas len -= chunk; 696c9de560dSAlex Tomas first += chunk; 697c9de560dSAlex Tomas } 698c9de560dSAlex Tomas } 699c9de560dSAlex Tomas 7008a57d9d6SCurt Wohlgemuth /* 7018a57d9d6SCurt Wohlgemuth * Cache the order of the largest free extent we have available in this block 7028a57d9d6SCurt Wohlgemuth * group. 7038a57d9d6SCurt Wohlgemuth */ 7048a57d9d6SCurt Wohlgemuth static void 7058a57d9d6SCurt Wohlgemuth mb_set_largest_free_order(struct super_block *sb, struct ext4_group_info *grp) 7068a57d9d6SCurt Wohlgemuth { 7078a57d9d6SCurt Wohlgemuth int i; 7088a57d9d6SCurt Wohlgemuth int bits; 7098a57d9d6SCurt Wohlgemuth 7108a57d9d6SCurt Wohlgemuth grp->bb_largest_free_order = -1; /* uninit */ 7118a57d9d6SCurt Wohlgemuth 7128a57d9d6SCurt Wohlgemuth bits = sb->s_blocksize_bits + 1; 7138a57d9d6SCurt Wohlgemuth for (i = bits; i >= 0; i--) { 7148a57d9d6SCurt Wohlgemuth if (grp->bb_counters[i] > 0) { 7158a57d9d6SCurt Wohlgemuth grp->bb_largest_free_order = i; 7168a57d9d6SCurt Wohlgemuth break; 7178a57d9d6SCurt Wohlgemuth } 7188a57d9d6SCurt Wohlgemuth } 7198a57d9d6SCurt Wohlgemuth } 7208a57d9d6SCurt Wohlgemuth 721089ceeccSEric Sandeen static noinline_for_stack 722089ceeccSEric Sandeen void ext4_mb_generate_buddy(struct super_block *sb, 723c9de560dSAlex Tomas void *buddy, void *bitmap, ext4_group_t group) 724c9de560dSAlex Tomas { 725c9de560dSAlex Tomas struct ext4_group_info *grp = ext4_get_group_info(sb, group); 726e43bb4e6SNamjae Jeon struct ext4_sb_info *sbi = EXT4_SB(sb); 7277137d7a4STheodore Ts'o ext4_grpblk_t max = EXT4_CLUSTERS_PER_GROUP(sb); 728a36b4498SEric Sandeen ext4_grpblk_t i = 0; 729a36b4498SEric Sandeen ext4_grpblk_t first; 730a36b4498SEric Sandeen ext4_grpblk_t len; 731c9de560dSAlex Tomas unsigned free = 0; 732c9de560dSAlex Tomas unsigned fragments = 0; 733c9de560dSAlex Tomas unsigned long long period = get_cycles(); 734c9de560dSAlex Tomas 735c9de560dSAlex Tomas /* initialize buddy from bitmap which is aggregation 736c9de560dSAlex Tomas * of on-disk bitmap and preallocations */ 737ffad0a44SAneesh Kumar K.V i = mb_find_next_zero_bit(bitmap, max, 0); 738c9de560dSAlex Tomas grp->bb_first_free = i; 739c9de560dSAlex Tomas while (i < max) { 740c9de560dSAlex Tomas fragments++; 741c9de560dSAlex Tomas first = i; 742ffad0a44SAneesh Kumar K.V i = mb_find_next_bit(bitmap, max, i); 743c9de560dSAlex Tomas len = i - first; 744c9de560dSAlex Tomas free += len; 745c9de560dSAlex Tomas if (len > 1) 746c9de560dSAlex Tomas ext4_mb_mark_free_simple(sb, buddy, first, len, grp); 747c9de560dSAlex Tomas else 748c9de560dSAlex Tomas grp->bb_counters[0]++; 749c9de560dSAlex Tomas if (i < max) 750ffad0a44SAneesh Kumar K.V i = mb_find_next_zero_bit(bitmap, max, i); 751c9de560dSAlex Tomas } 752c9de560dSAlex Tomas grp->bb_fragments = fragments; 753c9de560dSAlex Tomas 754c9de560dSAlex Tomas if (free != grp->bb_free) { 755e29136f8STheodore Ts'o ext4_grp_locked_error(sb, group, 0, 0, 75694d4c066STheodore Ts'o "block bitmap and bg descriptor " 75794d4c066STheodore Ts'o "inconsistent: %u vs %u free clusters", 758e29136f8STheodore Ts'o free, grp->bb_free); 759e56eb659SAneesh Kumar K.V /* 760163a203dSDarrick J. Wong * If we intend to continue, we consider group descriptor 761e56eb659SAneesh Kumar K.V * corrupt and update bb_free using bitmap value 762e56eb659SAneesh Kumar K.V */ 763c9de560dSAlex Tomas grp->bb_free = free; 764e43bb4e6SNamjae Jeon if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp)) 765e43bb4e6SNamjae Jeon percpu_counter_sub(&sbi->s_freeclusters_counter, 766e43bb4e6SNamjae Jeon grp->bb_free); 767163a203dSDarrick J. Wong set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state); 768c9de560dSAlex Tomas } 7698a57d9d6SCurt Wohlgemuth mb_set_largest_free_order(sb, grp); 770c9de560dSAlex Tomas 771c9de560dSAlex Tomas clear_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &(grp->bb_state)); 772c9de560dSAlex Tomas 773c9de560dSAlex Tomas period = get_cycles() - period; 774c9de560dSAlex Tomas spin_lock(&EXT4_SB(sb)->s_bal_lock); 775c9de560dSAlex Tomas EXT4_SB(sb)->s_mb_buddies_generated++; 776c9de560dSAlex Tomas EXT4_SB(sb)->s_mb_generation_time += period; 777c9de560dSAlex Tomas spin_unlock(&EXT4_SB(sb)->s_bal_lock); 778c9de560dSAlex Tomas } 779c9de560dSAlex Tomas 780eabe0444SAndrey Sidorov static void mb_regenerate_buddy(struct ext4_buddy *e4b) 781eabe0444SAndrey Sidorov { 782eabe0444SAndrey Sidorov int count; 783eabe0444SAndrey Sidorov int order = 1; 784eabe0444SAndrey Sidorov void *buddy; 785eabe0444SAndrey Sidorov 786eabe0444SAndrey Sidorov while ((buddy = mb_find_buddy(e4b, order++, &count))) { 787eabe0444SAndrey Sidorov ext4_set_bits(buddy, 0, count); 788eabe0444SAndrey Sidorov } 789eabe0444SAndrey Sidorov e4b->bd_info->bb_fragments = 0; 790eabe0444SAndrey Sidorov memset(e4b->bd_info->bb_counters, 0, 791eabe0444SAndrey Sidorov sizeof(*e4b->bd_info->bb_counters) * 792eabe0444SAndrey Sidorov (e4b->bd_sb->s_blocksize_bits + 2)); 793eabe0444SAndrey Sidorov 794eabe0444SAndrey Sidorov ext4_mb_generate_buddy(e4b->bd_sb, e4b->bd_buddy, 795eabe0444SAndrey Sidorov e4b->bd_bitmap, e4b->bd_group); 796eabe0444SAndrey Sidorov } 797eabe0444SAndrey Sidorov 798c9de560dSAlex Tomas /* The buddy information is attached the buddy cache inode 799c9de560dSAlex Tomas * for convenience. The information regarding each group 800c9de560dSAlex Tomas * is loaded via ext4_mb_load_buddy. The information involve 801c9de560dSAlex Tomas * block bitmap and buddy information. The information are 802c9de560dSAlex Tomas * stored in the inode as 803c9de560dSAlex Tomas * 804c9de560dSAlex Tomas * { page } 805c3a326a6SAneesh Kumar K.V * [ group 0 bitmap][ group 0 buddy] [group 1][ group 1]... 806c9de560dSAlex Tomas * 807c9de560dSAlex Tomas * 808c9de560dSAlex Tomas * one block each for bitmap and buddy information. 809c9de560dSAlex Tomas * So for each group we take up 2 blocks. A page can 810c9de560dSAlex Tomas * contain blocks_per_page (PAGE_CACHE_SIZE / blocksize) blocks. 811c9de560dSAlex Tomas * So it can have information regarding groups_per_page which 812c9de560dSAlex Tomas * is blocks_per_page/2 8138a57d9d6SCurt Wohlgemuth * 8148a57d9d6SCurt Wohlgemuth * Locking note: This routine takes the block group lock of all groups 8158a57d9d6SCurt Wohlgemuth * for this page; do not hold this lock when calling this routine! 816c9de560dSAlex Tomas */ 817c9de560dSAlex Tomas 818c9de560dSAlex Tomas static int ext4_mb_init_cache(struct page *page, char *incore) 819c9de560dSAlex Tomas { 8208df9675fSTheodore Ts'o ext4_group_t ngroups; 821c9de560dSAlex Tomas int blocksize; 822c9de560dSAlex Tomas int blocks_per_page; 823c9de560dSAlex Tomas int groups_per_page; 824c9de560dSAlex Tomas int err = 0; 825c9de560dSAlex Tomas int i; 826813e5727STheodore Ts'o ext4_group_t first_group, group; 827c9de560dSAlex Tomas int first_block; 828c9de560dSAlex Tomas struct super_block *sb; 829c9de560dSAlex Tomas struct buffer_head *bhs; 830fa77dcfaSDarrick J. Wong struct buffer_head **bh = NULL; 831c9de560dSAlex Tomas struct inode *inode; 832c9de560dSAlex Tomas char *data; 833c9de560dSAlex Tomas char *bitmap; 8349b8b7d35SAmir Goldstein struct ext4_group_info *grinfo; 835c9de560dSAlex Tomas 8366ba495e9STheodore Ts'o mb_debug(1, "init page %lu\n", page->index); 837c9de560dSAlex Tomas 838c9de560dSAlex Tomas inode = page->mapping->host; 839c9de560dSAlex Tomas sb = inode->i_sb; 8408df9675fSTheodore Ts'o ngroups = ext4_get_groups_count(sb); 841c9de560dSAlex Tomas blocksize = 1 << inode->i_blkbits; 842c9de560dSAlex Tomas blocks_per_page = PAGE_CACHE_SIZE / blocksize; 843c9de560dSAlex Tomas 844c9de560dSAlex Tomas groups_per_page = blocks_per_page >> 1; 845c9de560dSAlex Tomas if (groups_per_page == 0) 846c9de560dSAlex Tomas groups_per_page = 1; 847c9de560dSAlex Tomas 848c9de560dSAlex Tomas /* allocate buffer_heads to read bitmaps */ 849c9de560dSAlex Tomas if (groups_per_page > 1) { 850c9de560dSAlex Tomas i = sizeof(struct buffer_head *) * groups_per_page; 851c9de560dSAlex Tomas bh = kzalloc(i, GFP_NOFS); 852813e5727STheodore Ts'o if (bh == NULL) { 853813e5727STheodore Ts'o err = -ENOMEM; 854c9de560dSAlex Tomas goto out; 855813e5727STheodore Ts'o } 856c9de560dSAlex Tomas } else 857c9de560dSAlex Tomas bh = &bhs; 858c9de560dSAlex Tomas 859c9de560dSAlex Tomas first_group = page->index * blocks_per_page / 2; 860c9de560dSAlex Tomas 861c9de560dSAlex Tomas /* read all groups the page covers into the cache */ 862813e5727STheodore Ts'o for (i = 0, group = first_group; i < groups_per_page; i++, group++) { 863813e5727STheodore Ts'o if (group >= ngroups) 864c9de560dSAlex Tomas break; 865c9de560dSAlex Tomas 866813e5727STheodore Ts'o grinfo = ext4_get_group_info(sb, group); 8679b8b7d35SAmir Goldstein /* 8689b8b7d35SAmir Goldstein * If page is uptodate then we came here after online resize 8699b8b7d35SAmir Goldstein * which added some new uninitialized group info structs, so 8709b8b7d35SAmir Goldstein * we must skip all initialized uptodate buddies on the page, 8719b8b7d35SAmir Goldstein * which may be currently in use by an allocating task. 8729b8b7d35SAmir Goldstein */ 8739b8b7d35SAmir Goldstein if (PageUptodate(page) && !EXT4_MB_GRP_NEED_INIT(grinfo)) { 8749b8b7d35SAmir Goldstein bh[i] = NULL; 8759b8b7d35SAmir Goldstein continue; 8769b8b7d35SAmir Goldstein } 8779008a58eSDarrick J. Wong bh[i] = ext4_read_block_bitmap_nowait(sb, group); 8789008a58eSDarrick J. Wong if (IS_ERR(bh[i])) { 8799008a58eSDarrick J. Wong err = PTR_ERR(bh[i]); 8809008a58eSDarrick J. Wong bh[i] = NULL; 881c9de560dSAlex Tomas goto out; 8822ccb5fb9SAneesh Kumar K.V } 883813e5727STheodore Ts'o mb_debug(1, "read bitmap for group %u\n", group); 884c9de560dSAlex Tomas } 885c9de560dSAlex Tomas 886c9de560dSAlex Tomas /* wait for I/O completion */ 887813e5727STheodore Ts'o for (i = 0, group = first_group; i < groups_per_page; i++, group++) { 8889008a58eSDarrick J. Wong int err2; 8899008a58eSDarrick J. Wong 8909008a58eSDarrick J. Wong if (!bh[i]) 8919008a58eSDarrick J. Wong continue; 8929008a58eSDarrick J. Wong err2 = ext4_wait_block_bitmap(sb, group, bh[i]); 8939008a58eSDarrick J. Wong if (!err) 8949008a58eSDarrick J. Wong err = err2; 895813e5727STheodore Ts'o } 896c9de560dSAlex Tomas 897c9de560dSAlex Tomas first_block = page->index * blocks_per_page; 898c9de560dSAlex Tomas for (i = 0; i < blocks_per_page; i++) { 899c9de560dSAlex Tomas group = (first_block + i) >> 1; 9008df9675fSTheodore Ts'o if (group >= ngroups) 901c9de560dSAlex Tomas break; 902c9de560dSAlex Tomas 9039b8b7d35SAmir Goldstein if (!bh[group - first_group]) 9049b8b7d35SAmir Goldstein /* skip initialized uptodate buddy */ 9059b8b7d35SAmir Goldstein continue; 9069b8b7d35SAmir Goldstein 907bbdc322fSLukas Czerner if (!buffer_verified(bh[group - first_group])) 908bbdc322fSLukas Czerner /* Skip faulty bitmaps */ 909bbdc322fSLukas Czerner continue; 910bbdc322fSLukas Czerner err = 0; 911bbdc322fSLukas Czerner 912c9de560dSAlex Tomas /* 913c9de560dSAlex Tomas * data carry information regarding this 914c9de560dSAlex Tomas * particular group in the format specified 915c9de560dSAlex Tomas * above 916c9de560dSAlex Tomas * 917c9de560dSAlex Tomas */ 918c9de560dSAlex Tomas data = page_address(page) + (i * blocksize); 919c9de560dSAlex Tomas bitmap = bh[group - first_group]->b_data; 920c9de560dSAlex Tomas 921c9de560dSAlex Tomas /* 922c9de560dSAlex Tomas * We place the buddy block and bitmap block 923c9de560dSAlex Tomas * close together 924c9de560dSAlex Tomas */ 925c9de560dSAlex Tomas if ((first_block + i) & 1) { 926c9de560dSAlex Tomas /* this is block of buddy */ 927c9de560dSAlex Tomas BUG_ON(incore == NULL); 9286ba495e9STheodore Ts'o mb_debug(1, "put buddy for group %u in page %lu/%x\n", 929c9de560dSAlex Tomas group, page->index, i * blocksize); 930f307333eSTheodore Ts'o trace_ext4_mb_buddy_bitmap_load(sb, group); 931c9de560dSAlex Tomas grinfo = ext4_get_group_info(sb, group); 932c9de560dSAlex Tomas grinfo->bb_fragments = 0; 933c9de560dSAlex Tomas memset(grinfo->bb_counters, 0, 9341927805eSEric Sandeen sizeof(*grinfo->bb_counters) * 9351927805eSEric Sandeen (sb->s_blocksize_bits+2)); 936c9de560dSAlex Tomas /* 937c9de560dSAlex Tomas * incore got set to the group block bitmap below 938c9de560dSAlex Tomas */ 9397a2fcbf7SAneesh Kumar K.V ext4_lock_group(sb, group); 9409b8b7d35SAmir Goldstein /* init the buddy */ 9419b8b7d35SAmir Goldstein memset(data, 0xff, blocksize); 942c9de560dSAlex Tomas ext4_mb_generate_buddy(sb, data, incore, group); 9437a2fcbf7SAneesh Kumar K.V ext4_unlock_group(sb, group); 944c9de560dSAlex Tomas incore = NULL; 945c9de560dSAlex Tomas } else { 946c9de560dSAlex Tomas /* this is block of bitmap */ 947c9de560dSAlex Tomas BUG_ON(incore != NULL); 9486ba495e9STheodore Ts'o mb_debug(1, "put bitmap for group %u in page %lu/%x\n", 949c9de560dSAlex Tomas group, page->index, i * blocksize); 950f307333eSTheodore Ts'o trace_ext4_mb_bitmap_load(sb, group); 951c9de560dSAlex Tomas 952c9de560dSAlex Tomas /* see comments in ext4_mb_put_pa() */ 953c9de560dSAlex Tomas ext4_lock_group(sb, group); 954c9de560dSAlex Tomas memcpy(data, bitmap, blocksize); 955c9de560dSAlex Tomas 956c9de560dSAlex Tomas /* mark all preallocated blks used in in-core bitmap */ 957c9de560dSAlex Tomas ext4_mb_generate_from_pa(sb, data, group); 9587a2fcbf7SAneesh Kumar K.V ext4_mb_generate_from_freelist(sb, data, group); 959c9de560dSAlex Tomas ext4_unlock_group(sb, group); 960c9de560dSAlex Tomas 961c9de560dSAlex Tomas /* set incore so that the buddy information can be 962c9de560dSAlex Tomas * generated using this 963c9de560dSAlex Tomas */ 964c9de560dSAlex Tomas incore = data; 965c9de560dSAlex Tomas } 966c9de560dSAlex Tomas } 967c9de560dSAlex Tomas SetPageUptodate(page); 968c9de560dSAlex Tomas 969c9de560dSAlex Tomas out: 970c9de560dSAlex Tomas if (bh) { 9719b8b7d35SAmir Goldstein for (i = 0; i < groups_per_page; i++) 972c9de560dSAlex Tomas brelse(bh[i]); 973c9de560dSAlex Tomas if (bh != &bhs) 974c9de560dSAlex Tomas kfree(bh); 975c9de560dSAlex Tomas } 976c9de560dSAlex Tomas return err; 977c9de560dSAlex Tomas } 978c9de560dSAlex Tomas 9798a57d9d6SCurt Wohlgemuth /* 9802de8807bSAmir Goldstein * Lock the buddy and bitmap pages. This make sure other parallel init_group 9812de8807bSAmir Goldstein * on the same buddy page doesn't happen whild holding the buddy page lock. 9822de8807bSAmir Goldstein * Return locked buddy and bitmap pages on e4b struct. If buddy and bitmap 9832de8807bSAmir Goldstein * are on the same page e4b->bd_buddy_page is NULL and return value is 0. 984eee4adc7SEric Sandeen */ 9852de8807bSAmir Goldstein static int ext4_mb_get_buddy_page_lock(struct super_block *sb, 9862de8807bSAmir Goldstein ext4_group_t group, struct ext4_buddy *e4b) 987eee4adc7SEric Sandeen { 9882de8807bSAmir Goldstein struct inode *inode = EXT4_SB(sb)->s_buddy_cache; 9892de8807bSAmir Goldstein int block, pnum, poff; 990eee4adc7SEric Sandeen int blocks_per_page; 9912de8807bSAmir Goldstein struct page *page; 9922de8807bSAmir Goldstein 9932de8807bSAmir Goldstein e4b->bd_buddy_page = NULL; 9942de8807bSAmir Goldstein e4b->bd_bitmap_page = NULL; 995eee4adc7SEric Sandeen 996eee4adc7SEric Sandeen blocks_per_page = PAGE_CACHE_SIZE / sb->s_blocksize; 997eee4adc7SEric Sandeen /* 998eee4adc7SEric Sandeen * the buddy cache inode stores the block bitmap 999eee4adc7SEric Sandeen * and buddy information in consecutive blocks. 1000eee4adc7SEric Sandeen * So for each group we need two blocks. 1001eee4adc7SEric Sandeen */ 1002eee4adc7SEric Sandeen block = group * 2; 1003eee4adc7SEric Sandeen pnum = block / blocks_per_page; 10042de8807bSAmir Goldstein poff = block % blocks_per_page; 10052de8807bSAmir Goldstein page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS); 10062de8807bSAmir Goldstein if (!page) 1007c57ab39bSYounger Liu return -ENOMEM; 10082de8807bSAmir Goldstein BUG_ON(page->mapping != inode->i_mapping); 10092de8807bSAmir Goldstein e4b->bd_bitmap_page = page; 10102de8807bSAmir Goldstein e4b->bd_bitmap = page_address(page) + (poff * sb->s_blocksize); 1011eee4adc7SEric Sandeen 10122de8807bSAmir Goldstein if (blocks_per_page >= 2) { 10132de8807bSAmir Goldstein /* buddy and bitmap are on the same page */ 10142de8807bSAmir Goldstein return 0; 1015eee4adc7SEric Sandeen } 1016eee4adc7SEric Sandeen 10172de8807bSAmir Goldstein block++; 1018eee4adc7SEric Sandeen pnum = block / blocks_per_page; 10192de8807bSAmir Goldstein page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS); 10202de8807bSAmir Goldstein if (!page) 1021c57ab39bSYounger Liu return -ENOMEM; 10222de8807bSAmir Goldstein BUG_ON(page->mapping != inode->i_mapping); 10232de8807bSAmir Goldstein e4b->bd_buddy_page = page; 10242de8807bSAmir Goldstein return 0; 1025eee4adc7SEric Sandeen } 1026eee4adc7SEric Sandeen 10272de8807bSAmir Goldstein static void ext4_mb_put_buddy_page_lock(struct ext4_buddy *e4b) 10282de8807bSAmir Goldstein { 10292de8807bSAmir Goldstein if (e4b->bd_bitmap_page) { 10302de8807bSAmir Goldstein unlock_page(e4b->bd_bitmap_page); 10312de8807bSAmir Goldstein page_cache_release(e4b->bd_bitmap_page); 10322de8807bSAmir Goldstein } 10332de8807bSAmir Goldstein if (e4b->bd_buddy_page) { 10342de8807bSAmir Goldstein unlock_page(e4b->bd_buddy_page); 10352de8807bSAmir Goldstein page_cache_release(e4b->bd_buddy_page); 10362de8807bSAmir Goldstein } 1037eee4adc7SEric Sandeen } 1038eee4adc7SEric Sandeen 1039eee4adc7SEric Sandeen /* 10408a57d9d6SCurt Wohlgemuth * Locking note: This routine calls ext4_mb_init_cache(), which takes the 10418a57d9d6SCurt Wohlgemuth * block group lock of all groups for this page; do not hold the BG lock when 10428a57d9d6SCurt Wohlgemuth * calling this routine! 10438a57d9d6SCurt Wohlgemuth */ 1044b6a758ecSAneesh Kumar K.V static noinline_for_stack 1045b6a758ecSAneesh Kumar K.V int ext4_mb_init_group(struct super_block *sb, ext4_group_t group) 1046b6a758ecSAneesh Kumar K.V { 1047b6a758ecSAneesh Kumar K.V 1048b6a758ecSAneesh Kumar K.V struct ext4_group_info *this_grp; 10492de8807bSAmir Goldstein struct ext4_buddy e4b; 10502de8807bSAmir Goldstein struct page *page; 10512de8807bSAmir Goldstein int ret = 0; 1052b6a758ecSAneesh Kumar K.V 1053b10a44c3STheodore Ts'o might_sleep(); 1054b6a758ecSAneesh Kumar K.V mb_debug(1, "init group %u\n", group); 1055b6a758ecSAneesh Kumar K.V this_grp = ext4_get_group_info(sb, group); 1056b6a758ecSAneesh Kumar K.V /* 105708c3a813SAneesh Kumar K.V * This ensures that we don't reinit the buddy cache 105808c3a813SAneesh Kumar K.V * page which map to the group from which we are already 105908c3a813SAneesh Kumar K.V * allocating. If we are looking at the buddy cache we would 106008c3a813SAneesh Kumar K.V * have taken a reference using ext4_mb_load_buddy and that 10612de8807bSAmir Goldstein * would have pinned buddy page to page cache. 10622457aec6SMel Gorman * The call to ext4_mb_get_buddy_page_lock will mark the 10632457aec6SMel Gorman * page accessed. 1064b6a758ecSAneesh Kumar K.V */ 10652de8807bSAmir Goldstein ret = ext4_mb_get_buddy_page_lock(sb, group, &e4b); 10662de8807bSAmir Goldstein if (ret || !EXT4_MB_GRP_NEED_INIT(this_grp)) { 1067b6a758ecSAneesh Kumar K.V /* 1068b6a758ecSAneesh Kumar K.V * somebody initialized the group 1069b6a758ecSAneesh Kumar K.V * return without doing anything 1070b6a758ecSAneesh Kumar K.V */ 1071b6a758ecSAneesh Kumar K.V goto err; 1072b6a758ecSAneesh Kumar K.V } 10732de8807bSAmir Goldstein 10742de8807bSAmir Goldstein page = e4b.bd_bitmap_page; 1075b6a758ecSAneesh Kumar K.V ret = ext4_mb_init_cache(page, NULL); 10762de8807bSAmir Goldstein if (ret) 1077b6a758ecSAneesh Kumar K.V goto err; 10782de8807bSAmir Goldstein if (!PageUptodate(page)) { 1079b6a758ecSAneesh Kumar K.V ret = -EIO; 1080b6a758ecSAneesh Kumar K.V goto err; 1081b6a758ecSAneesh Kumar K.V } 1082b6a758ecSAneesh Kumar K.V 10832de8807bSAmir Goldstein if (e4b.bd_buddy_page == NULL) { 1084b6a758ecSAneesh Kumar K.V /* 1085b6a758ecSAneesh Kumar K.V * If both the bitmap and buddy are in 1086b6a758ecSAneesh Kumar K.V * the same page we don't need to force 1087b6a758ecSAneesh Kumar K.V * init the buddy 1088b6a758ecSAneesh Kumar K.V */ 10892de8807bSAmir Goldstein ret = 0; 1090b6a758ecSAneesh Kumar K.V goto err; 1091b6a758ecSAneesh Kumar K.V } 10922de8807bSAmir Goldstein /* init buddy cache */ 10932de8807bSAmir Goldstein page = e4b.bd_buddy_page; 10942de8807bSAmir Goldstein ret = ext4_mb_init_cache(page, e4b.bd_bitmap); 10952de8807bSAmir Goldstein if (ret) 10962de8807bSAmir Goldstein goto err; 10972de8807bSAmir Goldstein if (!PageUptodate(page)) { 1098b6a758ecSAneesh Kumar K.V ret = -EIO; 1099b6a758ecSAneesh Kumar K.V goto err; 1100b6a758ecSAneesh Kumar K.V } 1101b6a758ecSAneesh Kumar K.V err: 11022de8807bSAmir Goldstein ext4_mb_put_buddy_page_lock(&e4b); 1103b6a758ecSAneesh Kumar K.V return ret; 1104b6a758ecSAneesh Kumar K.V } 1105b6a758ecSAneesh Kumar K.V 11068a57d9d6SCurt Wohlgemuth /* 11078a57d9d6SCurt Wohlgemuth * Locking note: This routine calls ext4_mb_init_cache(), which takes the 11088a57d9d6SCurt Wohlgemuth * block group lock of all groups for this page; do not hold the BG lock when 11098a57d9d6SCurt Wohlgemuth * calling this routine! 11108a57d9d6SCurt Wohlgemuth */ 11114ddfef7bSEric Sandeen static noinline_for_stack int 11124ddfef7bSEric Sandeen ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group, 1113c9de560dSAlex Tomas struct ext4_buddy *e4b) 1114c9de560dSAlex Tomas { 1115c9de560dSAlex Tomas int blocks_per_page; 1116c9de560dSAlex Tomas int block; 1117c9de560dSAlex Tomas int pnum; 1118c9de560dSAlex Tomas int poff; 1119c9de560dSAlex Tomas struct page *page; 1120fdf6c7a7SShen Feng int ret; 1121920313a7SAneesh Kumar K.V struct ext4_group_info *grp; 1122920313a7SAneesh Kumar K.V struct ext4_sb_info *sbi = EXT4_SB(sb); 1123920313a7SAneesh Kumar K.V struct inode *inode = sbi->s_buddy_cache; 1124c9de560dSAlex Tomas 1125b10a44c3STheodore Ts'o might_sleep(); 11266ba495e9STheodore Ts'o mb_debug(1, "load group %u\n", group); 1127c9de560dSAlex Tomas 1128c9de560dSAlex Tomas blocks_per_page = PAGE_CACHE_SIZE / sb->s_blocksize; 1129920313a7SAneesh Kumar K.V grp = ext4_get_group_info(sb, group); 1130c9de560dSAlex Tomas 1131c9de560dSAlex Tomas e4b->bd_blkbits = sb->s_blocksize_bits; 1132529da704STao Ma e4b->bd_info = grp; 1133c9de560dSAlex Tomas e4b->bd_sb = sb; 1134c9de560dSAlex Tomas e4b->bd_group = group; 1135c9de560dSAlex Tomas e4b->bd_buddy_page = NULL; 1136c9de560dSAlex Tomas e4b->bd_bitmap_page = NULL; 1137c9de560dSAlex Tomas 1138f41c0750SAneesh Kumar K.V if (unlikely(EXT4_MB_GRP_NEED_INIT(grp))) { 1139f41c0750SAneesh Kumar K.V /* 1140f41c0750SAneesh Kumar K.V * we need full data about the group 1141f41c0750SAneesh Kumar K.V * to make a good selection 1142f41c0750SAneesh Kumar K.V */ 1143f41c0750SAneesh Kumar K.V ret = ext4_mb_init_group(sb, group); 1144f41c0750SAneesh Kumar K.V if (ret) 1145f41c0750SAneesh Kumar K.V return ret; 1146f41c0750SAneesh Kumar K.V } 1147f41c0750SAneesh Kumar K.V 1148c9de560dSAlex Tomas /* 1149c9de560dSAlex Tomas * the buddy cache inode stores the block bitmap 1150c9de560dSAlex Tomas * and buddy information in consecutive blocks. 1151c9de560dSAlex Tomas * So for each group we need two blocks. 1152c9de560dSAlex Tomas */ 1153c9de560dSAlex Tomas block = group * 2; 1154c9de560dSAlex Tomas pnum = block / blocks_per_page; 1155c9de560dSAlex Tomas poff = block % blocks_per_page; 1156c9de560dSAlex Tomas 1157c9de560dSAlex Tomas /* we could use find_or_create_page(), but it locks page 1158c9de560dSAlex Tomas * what we'd like to avoid in fast path ... */ 11592457aec6SMel Gorman page = find_get_page_flags(inode->i_mapping, pnum, FGP_ACCESSED); 1160c9de560dSAlex Tomas if (page == NULL || !PageUptodate(page)) { 1161c9de560dSAlex Tomas if (page) 1162920313a7SAneesh Kumar K.V /* 1163920313a7SAneesh Kumar K.V * drop the page reference and try 1164920313a7SAneesh Kumar K.V * to get the page with lock. If we 1165920313a7SAneesh Kumar K.V * are not uptodate that implies 1166920313a7SAneesh Kumar K.V * somebody just created the page but 1167920313a7SAneesh Kumar K.V * is yet to initialize the same. So 1168920313a7SAneesh Kumar K.V * wait for it to initialize. 1169920313a7SAneesh Kumar K.V */ 1170c9de560dSAlex Tomas page_cache_release(page); 1171c9de560dSAlex Tomas page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS); 1172c9de560dSAlex Tomas if (page) { 1173c9de560dSAlex Tomas BUG_ON(page->mapping != inode->i_mapping); 1174c9de560dSAlex Tomas if (!PageUptodate(page)) { 1175fdf6c7a7SShen Feng ret = ext4_mb_init_cache(page, NULL); 1176fdf6c7a7SShen Feng if (ret) { 1177fdf6c7a7SShen Feng unlock_page(page); 1178fdf6c7a7SShen Feng goto err; 1179fdf6c7a7SShen Feng } 1180c9de560dSAlex Tomas mb_cmp_bitmaps(e4b, page_address(page) + 1181c9de560dSAlex Tomas (poff * sb->s_blocksize)); 1182c9de560dSAlex Tomas } 1183c9de560dSAlex Tomas unlock_page(page); 1184c9de560dSAlex Tomas } 1185c9de560dSAlex Tomas } 1186c57ab39bSYounger Liu if (page == NULL) { 1187c57ab39bSYounger Liu ret = -ENOMEM; 1188c57ab39bSYounger Liu goto err; 1189c57ab39bSYounger Liu } 1190c57ab39bSYounger Liu if (!PageUptodate(page)) { 1191fdf6c7a7SShen Feng ret = -EIO; 1192c9de560dSAlex Tomas goto err; 1193fdf6c7a7SShen Feng } 11942457aec6SMel Gorman 11952457aec6SMel Gorman /* Pages marked accessed already */ 1196c9de560dSAlex Tomas e4b->bd_bitmap_page = page; 1197c9de560dSAlex Tomas e4b->bd_bitmap = page_address(page) + (poff * sb->s_blocksize); 1198c9de560dSAlex Tomas 1199c9de560dSAlex Tomas block++; 1200c9de560dSAlex Tomas pnum = block / blocks_per_page; 1201c9de560dSAlex Tomas poff = block % blocks_per_page; 1202c9de560dSAlex Tomas 12032457aec6SMel Gorman page = find_get_page_flags(inode->i_mapping, pnum, FGP_ACCESSED); 1204c9de560dSAlex Tomas if (page == NULL || !PageUptodate(page)) { 1205c9de560dSAlex Tomas if (page) 1206c9de560dSAlex Tomas page_cache_release(page); 1207c9de560dSAlex Tomas page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS); 1208c9de560dSAlex Tomas if (page) { 1209c9de560dSAlex Tomas BUG_ON(page->mapping != inode->i_mapping); 1210fdf6c7a7SShen Feng if (!PageUptodate(page)) { 1211fdf6c7a7SShen Feng ret = ext4_mb_init_cache(page, e4b->bd_bitmap); 1212fdf6c7a7SShen Feng if (ret) { 1213fdf6c7a7SShen Feng unlock_page(page); 1214fdf6c7a7SShen Feng goto err; 1215fdf6c7a7SShen Feng } 1216fdf6c7a7SShen Feng } 1217c9de560dSAlex Tomas unlock_page(page); 1218c9de560dSAlex Tomas } 1219c9de560dSAlex Tomas } 1220c57ab39bSYounger Liu if (page == NULL) { 1221c57ab39bSYounger Liu ret = -ENOMEM; 1222c57ab39bSYounger Liu goto err; 1223c57ab39bSYounger Liu } 1224c57ab39bSYounger Liu if (!PageUptodate(page)) { 1225fdf6c7a7SShen Feng ret = -EIO; 1226c9de560dSAlex Tomas goto err; 1227fdf6c7a7SShen Feng } 12282457aec6SMel Gorman 12292457aec6SMel Gorman /* Pages marked accessed already */ 1230c9de560dSAlex Tomas e4b->bd_buddy_page = page; 1231c9de560dSAlex Tomas e4b->bd_buddy = page_address(page) + (poff * sb->s_blocksize); 1232c9de560dSAlex Tomas 1233c9de560dSAlex Tomas BUG_ON(e4b->bd_bitmap_page == NULL); 1234c9de560dSAlex Tomas BUG_ON(e4b->bd_buddy_page == NULL); 1235c9de560dSAlex Tomas 1236c9de560dSAlex Tomas return 0; 1237c9de560dSAlex Tomas 1238c9de560dSAlex Tomas err: 123926626f11SYang Ruirui if (page) 124026626f11SYang Ruirui page_cache_release(page); 1241c9de560dSAlex Tomas if (e4b->bd_bitmap_page) 1242c9de560dSAlex Tomas page_cache_release(e4b->bd_bitmap_page); 1243c9de560dSAlex Tomas if (e4b->bd_buddy_page) 1244c9de560dSAlex Tomas page_cache_release(e4b->bd_buddy_page); 1245c9de560dSAlex Tomas e4b->bd_buddy = NULL; 1246c9de560dSAlex Tomas e4b->bd_bitmap = NULL; 1247fdf6c7a7SShen Feng return ret; 1248c9de560dSAlex Tomas } 1249c9de560dSAlex Tomas 1250e39e07fdSJing Zhang static void ext4_mb_unload_buddy(struct ext4_buddy *e4b) 1251c9de560dSAlex Tomas { 1252c9de560dSAlex Tomas if (e4b->bd_bitmap_page) 1253c9de560dSAlex Tomas page_cache_release(e4b->bd_bitmap_page); 1254c9de560dSAlex Tomas if (e4b->bd_buddy_page) 1255c9de560dSAlex Tomas page_cache_release(e4b->bd_buddy_page); 1256c9de560dSAlex Tomas } 1257c9de560dSAlex Tomas 1258c9de560dSAlex Tomas 1259c9de560dSAlex Tomas static int mb_find_order_for_block(struct ext4_buddy *e4b, int block) 1260c9de560dSAlex Tomas { 1261c9de560dSAlex Tomas int order = 1; 1262c9de560dSAlex Tomas void *bb; 1263c9de560dSAlex Tomas 1264c5e8f3f3STheodore Ts'o BUG_ON(e4b->bd_bitmap == e4b->bd_buddy); 1265c9de560dSAlex Tomas BUG_ON(block >= (1 << (e4b->bd_blkbits + 3))); 1266c9de560dSAlex Tomas 1267c5e8f3f3STheodore Ts'o bb = e4b->bd_buddy; 1268c9de560dSAlex Tomas while (order <= e4b->bd_blkbits + 1) { 1269c9de560dSAlex Tomas block = block >> 1; 1270c9de560dSAlex Tomas if (!mb_test_bit(block, bb)) { 1271c9de560dSAlex Tomas /* this block is part of buddy of order 'order' */ 1272c9de560dSAlex Tomas return order; 1273c9de560dSAlex Tomas } 1274c9de560dSAlex Tomas bb += 1 << (e4b->bd_blkbits - order); 1275c9de560dSAlex Tomas order++; 1276c9de560dSAlex Tomas } 1277c9de560dSAlex Tomas return 0; 1278c9de560dSAlex Tomas } 1279c9de560dSAlex Tomas 1280955ce5f5SAneesh Kumar K.V static void mb_clear_bits(void *bm, int cur, int len) 1281c9de560dSAlex Tomas { 1282c9de560dSAlex Tomas __u32 *addr; 1283c9de560dSAlex Tomas 1284c9de560dSAlex Tomas len = cur + len; 1285c9de560dSAlex Tomas while (cur < len) { 1286c9de560dSAlex Tomas if ((cur & 31) == 0 && (len - cur) >= 32) { 1287c9de560dSAlex Tomas /* fast path: clear whole word at once */ 1288c9de560dSAlex Tomas addr = bm + (cur >> 3); 1289c9de560dSAlex Tomas *addr = 0; 1290c9de560dSAlex Tomas cur += 32; 1291c9de560dSAlex Tomas continue; 1292c9de560dSAlex Tomas } 1293e8134b27SAneesh Kumar K.V mb_clear_bit(cur, bm); 1294c9de560dSAlex Tomas cur++; 1295c9de560dSAlex Tomas } 1296c9de560dSAlex Tomas } 1297c9de560dSAlex Tomas 1298eabe0444SAndrey Sidorov /* clear bits in given range 1299eabe0444SAndrey Sidorov * will return first found zero bit if any, -1 otherwise 1300eabe0444SAndrey Sidorov */ 1301eabe0444SAndrey Sidorov static int mb_test_and_clear_bits(void *bm, int cur, int len) 1302eabe0444SAndrey Sidorov { 1303eabe0444SAndrey Sidorov __u32 *addr; 1304eabe0444SAndrey Sidorov int zero_bit = -1; 1305eabe0444SAndrey Sidorov 1306eabe0444SAndrey Sidorov len = cur + len; 1307eabe0444SAndrey Sidorov while (cur < len) { 1308eabe0444SAndrey Sidorov if ((cur & 31) == 0 && (len - cur) >= 32) { 1309eabe0444SAndrey Sidorov /* fast path: clear whole word at once */ 1310eabe0444SAndrey Sidorov addr = bm + (cur >> 3); 1311eabe0444SAndrey Sidorov if (*addr != (__u32)(-1) && zero_bit == -1) 1312eabe0444SAndrey Sidorov zero_bit = cur + mb_find_next_zero_bit(addr, 32, 0); 1313eabe0444SAndrey Sidorov *addr = 0; 1314eabe0444SAndrey Sidorov cur += 32; 1315eabe0444SAndrey Sidorov continue; 1316eabe0444SAndrey Sidorov } 1317eabe0444SAndrey Sidorov if (!mb_test_and_clear_bit(cur, bm) && zero_bit == -1) 1318eabe0444SAndrey Sidorov zero_bit = cur; 1319eabe0444SAndrey Sidorov cur++; 1320eabe0444SAndrey Sidorov } 1321eabe0444SAndrey Sidorov 1322eabe0444SAndrey Sidorov return zero_bit; 1323eabe0444SAndrey Sidorov } 1324eabe0444SAndrey Sidorov 1325c3e94d1dSYongqiang Yang void ext4_set_bits(void *bm, int cur, int len) 1326c9de560dSAlex Tomas { 1327c9de560dSAlex Tomas __u32 *addr; 1328c9de560dSAlex Tomas 1329c9de560dSAlex Tomas len = cur + len; 1330c9de560dSAlex Tomas while (cur < len) { 1331c9de560dSAlex Tomas if ((cur & 31) == 0 && (len - cur) >= 32) { 1332c9de560dSAlex Tomas /* fast path: set whole word at once */ 1333c9de560dSAlex Tomas addr = bm + (cur >> 3); 1334c9de560dSAlex Tomas *addr = 0xffffffff; 1335c9de560dSAlex Tomas cur += 32; 1336c9de560dSAlex Tomas continue; 1337c9de560dSAlex Tomas } 1338e8134b27SAneesh Kumar K.V mb_set_bit(cur, bm); 1339c9de560dSAlex Tomas cur++; 1340c9de560dSAlex Tomas } 1341c9de560dSAlex Tomas } 1342c9de560dSAlex Tomas 1343eabe0444SAndrey Sidorov /* 1344eabe0444SAndrey Sidorov * _________________________________________________________________ */ 1345eabe0444SAndrey Sidorov 1346eabe0444SAndrey Sidorov static inline int mb_buddy_adjust_border(int* bit, void* bitmap, int side) 1347eabe0444SAndrey Sidorov { 1348eabe0444SAndrey Sidorov if (mb_test_bit(*bit + side, bitmap)) { 1349eabe0444SAndrey Sidorov mb_clear_bit(*bit, bitmap); 1350eabe0444SAndrey Sidorov (*bit) -= side; 1351eabe0444SAndrey Sidorov return 1; 1352eabe0444SAndrey Sidorov } 1353eabe0444SAndrey Sidorov else { 1354eabe0444SAndrey Sidorov (*bit) += side; 1355eabe0444SAndrey Sidorov mb_set_bit(*bit, bitmap); 1356eabe0444SAndrey Sidorov return -1; 1357eabe0444SAndrey Sidorov } 1358eabe0444SAndrey Sidorov } 1359eabe0444SAndrey Sidorov 1360eabe0444SAndrey Sidorov static void mb_buddy_mark_free(struct ext4_buddy *e4b, int first, int last) 1361eabe0444SAndrey Sidorov { 1362eabe0444SAndrey Sidorov int max; 1363eabe0444SAndrey Sidorov int order = 1; 1364eabe0444SAndrey Sidorov void *buddy = mb_find_buddy(e4b, order, &max); 1365eabe0444SAndrey Sidorov 1366eabe0444SAndrey Sidorov while (buddy) { 1367eabe0444SAndrey Sidorov void *buddy2; 1368eabe0444SAndrey Sidorov 1369eabe0444SAndrey Sidorov /* Bits in range [first; last] are known to be set since 1370eabe0444SAndrey Sidorov * corresponding blocks were allocated. Bits in range 1371eabe0444SAndrey Sidorov * (first; last) will stay set because they form buddies on 1372eabe0444SAndrey Sidorov * upper layer. We just deal with borders if they don't 1373eabe0444SAndrey Sidorov * align with upper layer and then go up. 1374eabe0444SAndrey Sidorov * Releasing entire group is all about clearing 1375eabe0444SAndrey Sidorov * single bit of highest order buddy. 1376eabe0444SAndrey Sidorov */ 1377eabe0444SAndrey Sidorov 1378eabe0444SAndrey Sidorov /* Example: 1379eabe0444SAndrey Sidorov * --------------------------------- 1380eabe0444SAndrey Sidorov * | 1 | 1 | 1 | 1 | 1381eabe0444SAndrey Sidorov * --------------------------------- 1382eabe0444SAndrey Sidorov * | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1383eabe0444SAndrey Sidorov * --------------------------------- 1384eabe0444SAndrey Sidorov * 0 1 2 3 4 5 6 7 1385eabe0444SAndrey Sidorov * \_____________________/ 1386eabe0444SAndrey Sidorov * 1387eabe0444SAndrey Sidorov * Neither [1] nor [6] is aligned to above layer. 1388eabe0444SAndrey Sidorov * Left neighbour [0] is free, so mark it busy, 1389eabe0444SAndrey Sidorov * decrease bb_counters and extend range to 1390eabe0444SAndrey Sidorov * [0; 6] 1391eabe0444SAndrey Sidorov * Right neighbour [7] is busy. It can't be coaleasced with [6], so 1392eabe0444SAndrey Sidorov * mark [6] free, increase bb_counters and shrink range to 1393eabe0444SAndrey Sidorov * [0; 5]. 1394eabe0444SAndrey Sidorov * Then shift range to [0; 2], go up and do the same. 1395eabe0444SAndrey Sidorov */ 1396eabe0444SAndrey Sidorov 1397eabe0444SAndrey Sidorov 1398eabe0444SAndrey Sidorov if (first & 1) 1399eabe0444SAndrey Sidorov e4b->bd_info->bb_counters[order] += mb_buddy_adjust_border(&first, buddy, -1); 1400eabe0444SAndrey Sidorov if (!(last & 1)) 1401eabe0444SAndrey Sidorov e4b->bd_info->bb_counters[order] += mb_buddy_adjust_border(&last, buddy, 1); 1402eabe0444SAndrey Sidorov if (first > last) 1403eabe0444SAndrey Sidorov break; 1404eabe0444SAndrey Sidorov order++; 1405eabe0444SAndrey Sidorov 1406eabe0444SAndrey Sidorov if (first == last || !(buddy2 = mb_find_buddy(e4b, order, &max))) { 1407eabe0444SAndrey Sidorov mb_clear_bits(buddy, first, last - first + 1); 1408eabe0444SAndrey Sidorov e4b->bd_info->bb_counters[order - 1] += last - first + 1; 1409eabe0444SAndrey Sidorov break; 1410eabe0444SAndrey Sidorov } 1411eabe0444SAndrey Sidorov first >>= 1; 1412eabe0444SAndrey Sidorov last >>= 1; 1413eabe0444SAndrey Sidorov buddy = buddy2; 1414eabe0444SAndrey Sidorov } 1415eabe0444SAndrey Sidorov } 1416eabe0444SAndrey Sidorov 14177e5a8cddSShen Feng static void mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b, 1418c9de560dSAlex Tomas int first, int count) 1419c9de560dSAlex Tomas { 1420eabe0444SAndrey Sidorov int left_is_free = 0; 1421eabe0444SAndrey Sidorov int right_is_free = 0; 1422eabe0444SAndrey Sidorov int block; 1423eabe0444SAndrey Sidorov int last = first + count - 1; 1424c9de560dSAlex Tomas struct super_block *sb = e4b->bd_sb; 1425c9de560dSAlex Tomas 1426c99d1e6eSTheodore Ts'o if (WARN_ON(count == 0)) 1427c99d1e6eSTheodore Ts'o return; 1428eabe0444SAndrey Sidorov BUG_ON(last >= (sb->s_blocksize << 3)); 1429bc8e6740SVincent Minet assert_spin_locked(ext4_group_lock_ptr(sb, e4b->bd_group)); 1430163a203dSDarrick J. Wong /* Don't bother if the block group is corrupt. */ 1431163a203dSDarrick J. Wong if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info))) 1432163a203dSDarrick J. Wong return; 1433163a203dSDarrick J. Wong 1434c9de560dSAlex Tomas mb_check_buddy(e4b); 1435c9de560dSAlex Tomas mb_free_blocks_double(inode, e4b, first, count); 1436c9de560dSAlex Tomas 1437c9de560dSAlex Tomas e4b->bd_info->bb_free += count; 1438c9de560dSAlex Tomas if (first < e4b->bd_info->bb_first_free) 1439c9de560dSAlex Tomas e4b->bd_info->bb_first_free = first; 1440c9de560dSAlex Tomas 1441eabe0444SAndrey Sidorov /* access memory sequentially: check left neighbour, 1442eabe0444SAndrey Sidorov * clear range and then check right neighbour 1443eabe0444SAndrey Sidorov */ 1444c9de560dSAlex Tomas if (first != 0) 1445eabe0444SAndrey Sidorov left_is_free = !mb_test_bit(first - 1, e4b->bd_bitmap); 1446eabe0444SAndrey Sidorov block = mb_test_and_clear_bits(e4b->bd_bitmap, first, count); 1447eabe0444SAndrey Sidorov if (last + 1 < EXT4_SB(sb)->s_mb_maxs[0]) 1448eabe0444SAndrey Sidorov right_is_free = !mb_test_bit(last + 1, e4b->bd_bitmap); 1449c9de560dSAlex Tomas 1450eabe0444SAndrey Sidorov if (unlikely(block != -1)) { 1451e43bb4e6SNamjae Jeon struct ext4_sb_info *sbi = EXT4_SB(sb); 1452c9de560dSAlex Tomas ext4_fsblk_t blocknr; 14535661bd68SAkinobu Mita 14545661bd68SAkinobu Mita blocknr = ext4_group_first_block_no(sb, e4b->bd_group); 145553accfa9STheodore Ts'o blocknr += EXT4_C2B(EXT4_SB(sb), block); 14565d1b1b3fSAneesh Kumar K.V ext4_grp_locked_error(sb, e4b->bd_group, 1457e29136f8STheodore Ts'o inode ? inode->i_ino : 0, 1458e29136f8STheodore Ts'o blocknr, 1459e29136f8STheodore Ts'o "freeing already freed block " 1460163a203dSDarrick J. Wong "(bit %u); block bitmap corrupt.", 1461163a203dSDarrick J. Wong block); 1462e43bb4e6SNamjae Jeon if (!EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info)) 1463e43bb4e6SNamjae Jeon percpu_counter_sub(&sbi->s_freeclusters_counter, 1464e43bb4e6SNamjae Jeon e4b->bd_info->bb_free); 1465163a203dSDarrick J. Wong /* Mark the block group as corrupt. */ 1466163a203dSDarrick J. Wong set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, 1467163a203dSDarrick J. Wong &e4b->bd_info->bb_state); 1468eabe0444SAndrey Sidorov mb_regenerate_buddy(e4b); 1469eabe0444SAndrey Sidorov goto done; 1470c9de560dSAlex Tomas } 1471c9de560dSAlex Tomas 1472eabe0444SAndrey Sidorov /* let's maintain fragments counter */ 1473eabe0444SAndrey Sidorov if (left_is_free && right_is_free) 1474eabe0444SAndrey Sidorov e4b->bd_info->bb_fragments--; 1475eabe0444SAndrey Sidorov else if (!left_is_free && !right_is_free) 1476eabe0444SAndrey Sidorov e4b->bd_info->bb_fragments++; 1477c9de560dSAlex Tomas 1478eabe0444SAndrey Sidorov /* buddy[0] == bd_bitmap is a special case, so handle 1479eabe0444SAndrey Sidorov * it right away and let mb_buddy_mark_free stay free of 1480eabe0444SAndrey Sidorov * zero order checks. 1481eabe0444SAndrey Sidorov * Check if neighbours are to be coaleasced, 1482eabe0444SAndrey Sidorov * adjust bitmap bb_counters and borders appropriately. 1483eabe0444SAndrey Sidorov */ 1484eabe0444SAndrey Sidorov if (first & 1) { 1485eabe0444SAndrey Sidorov first += !left_is_free; 1486eabe0444SAndrey Sidorov e4b->bd_info->bb_counters[0] += left_is_free ? -1 : 1; 1487c9de560dSAlex Tomas } 1488eabe0444SAndrey Sidorov if (!(last & 1)) { 1489eabe0444SAndrey Sidorov last -= !right_is_free; 1490eabe0444SAndrey Sidorov e4b->bd_info->bb_counters[0] += right_is_free ? -1 : 1; 1491c9de560dSAlex Tomas } 1492eabe0444SAndrey Sidorov 1493eabe0444SAndrey Sidorov if (first <= last) 1494eabe0444SAndrey Sidorov mb_buddy_mark_free(e4b, first >> 1, last >> 1); 1495eabe0444SAndrey Sidorov 1496eabe0444SAndrey Sidorov done: 14978a57d9d6SCurt Wohlgemuth mb_set_largest_free_order(sb, e4b->bd_info); 1498c9de560dSAlex Tomas mb_check_buddy(e4b); 1499c9de560dSAlex Tomas } 1500c9de560dSAlex Tomas 150115c006a2SRobin Dong static int mb_find_extent(struct ext4_buddy *e4b, int block, 1502c9de560dSAlex Tomas int needed, struct ext4_free_extent *ex) 1503c9de560dSAlex Tomas { 1504c9de560dSAlex Tomas int next = block; 150515c006a2SRobin Dong int max, order; 1506c9de560dSAlex Tomas void *buddy; 1507c9de560dSAlex Tomas 1508bc8e6740SVincent Minet assert_spin_locked(ext4_group_lock_ptr(e4b->bd_sb, e4b->bd_group)); 1509c9de560dSAlex Tomas BUG_ON(ex == NULL); 1510c9de560dSAlex Tomas 151115c006a2SRobin Dong buddy = mb_find_buddy(e4b, 0, &max); 1512c9de560dSAlex Tomas BUG_ON(buddy == NULL); 1513c9de560dSAlex Tomas BUG_ON(block >= max); 1514c9de560dSAlex Tomas if (mb_test_bit(block, buddy)) { 1515c9de560dSAlex Tomas ex->fe_len = 0; 1516c9de560dSAlex Tomas ex->fe_start = 0; 1517c9de560dSAlex Tomas ex->fe_group = 0; 1518c9de560dSAlex Tomas return 0; 1519c9de560dSAlex Tomas } 1520c9de560dSAlex Tomas 1521c9de560dSAlex Tomas /* find actual order */ 1522c9de560dSAlex Tomas order = mb_find_order_for_block(e4b, block); 1523c9de560dSAlex Tomas block = block >> order; 1524c9de560dSAlex Tomas 1525c9de560dSAlex Tomas ex->fe_len = 1 << order; 1526c9de560dSAlex Tomas ex->fe_start = block << order; 1527c9de560dSAlex Tomas ex->fe_group = e4b->bd_group; 1528c9de560dSAlex Tomas 1529c9de560dSAlex Tomas /* calc difference from given start */ 1530c9de560dSAlex Tomas next = next - ex->fe_start; 1531c9de560dSAlex Tomas ex->fe_len -= next; 1532c9de560dSAlex Tomas ex->fe_start += next; 1533c9de560dSAlex Tomas 1534c9de560dSAlex Tomas while (needed > ex->fe_len && 1535d8ec0c39SAlan Cox mb_find_buddy(e4b, order, &max)) { 1536c9de560dSAlex Tomas 1537c9de560dSAlex Tomas if (block + 1 >= max) 1538c9de560dSAlex Tomas break; 1539c9de560dSAlex Tomas 1540c9de560dSAlex Tomas next = (block + 1) * (1 << order); 1541c5e8f3f3STheodore Ts'o if (mb_test_bit(next, e4b->bd_bitmap)) 1542c9de560dSAlex Tomas break; 1543c9de560dSAlex Tomas 1544b051d8dcSRobin Dong order = mb_find_order_for_block(e4b, next); 1545c9de560dSAlex Tomas 1546c9de560dSAlex Tomas block = next >> order; 1547c9de560dSAlex Tomas ex->fe_len += 1 << order; 1548c9de560dSAlex Tomas } 1549c9de560dSAlex Tomas 1550c9de560dSAlex Tomas BUG_ON(ex->fe_start + ex->fe_len > (1 << (e4b->bd_blkbits + 3))); 1551c9de560dSAlex Tomas return ex->fe_len; 1552c9de560dSAlex Tomas } 1553c9de560dSAlex Tomas 1554c9de560dSAlex Tomas static int mb_mark_used(struct ext4_buddy *e4b, struct ext4_free_extent *ex) 1555c9de560dSAlex Tomas { 1556c9de560dSAlex Tomas int ord; 1557c9de560dSAlex Tomas int mlen = 0; 1558c9de560dSAlex Tomas int max = 0; 1559c9de560dSAlex Tomas int cur; 1560c9de560dSAlex Tomas int start = ex->fe_start; 1561c9de560dSAlex Tomas int len = ex->fe_len; 1562c9de560dSAlex Tomas unsigned ret = 0; 1563c9de560dSAlex Tomas int len0 = len; 1564c9de560dSAlex Tomas void *buddy; 1565c9de560dSAlex Tomas 1566c9de560dSAlex Tomas BUG_ON(start + len > (e4b->bd_sb->s_blocksize << 3)); 1567c9de560dSAlex Tomas BUG_ON(e4b->bd_group != ex->fe_group); 1568bc8e6740SVincent Minet assert_spin_locked(ext4_group_lock_ptr(e4b->bd_sb, e4b->bd_group)); 1569c9de560dSAlex Tomas mb_check_buddy(e4b); 1570c9de560dSAlex Tomas mb_mark_used_double(e4b, start, len); 1571c9de560dSAlex Tomas 1572c9de560dSAlex Tomas e4b->bd_info->bb_free -= len; 1573c9de560dSAlex Tomas if (e4b->bd_info->bb_first_free == start) 1574c9de560dSAlex Tomas e4b->bd_info->bb_first_free += len; 1575c9de560dSAlex Tomas 1576c9de560dSAlex Tomas /* let's maintain fragments counter */ 1577c9de560dSAlex Tomas if (start != 0) 1578c5e8f3f3STheodore Ts'o mlen = !mb_test_bit(start - 1, e4b->bd_bitmap); 1579c9de560dSAlex Tomas if (start + len < EXT4_SB(e4b->bd_sb)->s_mb_maxs[0]) 1580c5e8f3f3STheodore Ts'o max = !mb_test_bit(start + len, e4b->bd_bitmap); 1581c9de560dSAlex Tomas if (mlen && max) 1582c9de560dSAlex Tomas e4b->bd_info->bb_fragments++; 1583c9de560dSAlex Tomas else if (!mlen && !max) 1584c9de560dSAlex Tomas e4b->bd_info->bb_fragments--; 1585c9de560dSAlex Tomas 1586c9de560dSAlex Tomas /* let's maintain buddy itself */ 1587c9de560dSAlex Tomas while (len) { 1588c9de560dSAlex Tomas ord = mb_find_order_for_block(e4b, start); 1589c9de560dSAlex Tomas 1590c9de560dSAlex Tomas if (((start >> ord) << ord) == start && len >= (1 << ord)) { 1591c9de560dSAlex Tomas /* the whole chunk may be allocated at once! */ 1592c9de560dSAlex Tomas mlen = 1 << ord; 1593c9de560dSAlex Tomas buddy = mb_find_buddy(e4b, ord, &max); 1594c9de560dSAlex Tomas BUG_ON((start >> ord) >= max); 1595c9de560dSAlex Tomas mb_set_bit(start >> ord, buddy); 1596c9de560dSAlex Tomas e4b->bd_info->bb_counters[ord]--; 1597c9de560dSAlex Tomas start += mlen; 1598c9de560dSAlex Tomas len -= mlen; 1599c9de560dSAlex Tomas BUG_ON(len < 0); 1600c9de560dSAlex Tomas continue; 1601c9de560dSAlex Tomas } 1602c9de560dSAlex Tomas 1603c9de560dSAlex Tomas /* store for history */ 1604c9de560dSAlex Tomas if (ret == 0) 1605c9de560dSAlex Tomas ret = len | (ord << 16); 1606c9de560dSAlex Tomas 1607c9de560dSAlex Tomas /* we have to split large buddy */ 1608c9de560dSAlex Tomas BUG_ON(ord <= 0); 1609c9de560dSAlex Tomas buddy = mb_find_buddy(e4b, ord, &max); 1610c9de560dSAlex Tomas mb_set_bit(start >> ord, buddy); 1611c9de560dSAlex Tomas e4b->bd_info->bb_counters[ord]--; 1612c9de560dSAlex Tomas 1613c9de560dSAlex Tomas ord--; 1614c9de560dSAlex Tomas cur = (start >> ord) & ~1U; 1615c9de560dSAlex Tomas buddy = mb_find_buddy(e4b, ord, &max); 1616c9de560dSAlex Tomas mb_clear_bit(cur, buddy); 1617c9de560dSAlex Tomas mb_clear_bit(cur + 1, buddy); 1618c9de560dSAlex Tomas e4b->bd_info->bb_counters[ord]++; 1619c9de560dSAlex Tomas e4b->bd_info->bb_counters[ord]++; 1620c9de560dSAlex Tomas } 16218a57d9d6SCurt Wohlgemuth mb_set_largest_free_order(e4b->bd_sb, e4b->bd_info); 1622c9de560dSAlex Tomas 1623c5e8f3f3STheodore Ts'o ext4_set_bits(e4b->bd_bitmap, ex->fe_start, len0); 1624c9de560dSAlex Tomas mb_check_buddy(e4b); 1625c9de560dSAlex Tomas 1626c9de560dSAlex Tomas return ret; 1627c9de560dSAlex Tomas } 1628c9de560dSAlex Tomas 1629c9de560dSAlex Tomas /* 1630c9de560dSAlex Tomas * Must be called under group lock! 1631c9de560dSAlex Tomas */ 1632c9de560dSAlex Tomas static void ext4_mb_use_best_found(struct ext4_allocation_context *ac, 1633c9de560dSAlex Tomas struct ext4_buddy *e4b) 1634c9de560dSAlex Tomas { 1635c9de560dSAlex Tomas struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); 1636c9de560dSAlex Tomas int ret; 1637c9de560dSAlex Tomas 1638c9de560dSAlex Tomas BUG_ON(ac->ac_b_ex.fe_group != e4b->bd_group); 1639c9de560dSAlex Tomas BUG_ON(ac->ac_status == AC_STATUS_FOUND); 1640c9de560dSAlex Tomas 1641c9de560dSAlex Tomas ac->ac_b_ex.fe_len = min(ac->ac_b_ex.fe_len, ac->ac_g_ex.fe_len); 1642c9de560dSAlex Tomas ac->ac_b_ex.fe_logical = ac->ac_g_ex.fe_logical; 1643c9de560dSAlex Tomas ret = mb_mark_used(e4b, &ac->ac_b_ex); 1644c9de560dSAlex Tomas 1645c9de560dSAlex Tomas /* preallocation can change ac_b_ex, thus we store actually 1646c9de560dSAlex Tomas * allocated blocks for history */ 1647c9de560dSAlex Tomas ac->ac_f_ex = ac->ac_b_ex; 1648c9de560dSAlex Tomas 1649c9de560dSAlex Tomas ac->ac_status = AC_STATUS_FOUND; 1650c9de560dSAlex Tomas ac->ac_tail = ret & 0xffff; 1651c9de560dSAlex Tomas ac->ac_buddy = ret >> 16; 1652c9de560dSAlex Tomas 1653c3a326a6SAneesh Kumar K.V /* 1654c3a326a6SAneesh Kumar K.V * take the page reference. We want the page to be pinned 1655c3a326a6SAneesh Kumar K.V * so that we don't get a ext4_mb_init_cache_call for this 1656c3a326a6SAneesh Kumar K.V * group until we update the bitmap. That would mean we 1657c3a326a6SAneesh Kumar K.V * double allocate blocks. The reference is dropped 1658c3a326a6SAneesh Kumar K.V * in ext4_mb_release_context 1659c3a326a6SAneesh Kumar K.V */ 1660c9de560dSAlex Tomas ac->ac_bitmap_page = e4b->bd_bitmap_page; 1661c9de560dSAlex Tomas get_page(ac->ac_bitmap_page); 1662c9de560dSAlex Tomas ac->ac_buddy_page = e4b->bd_buddy_page; 1663c9de560dSAlex Tomas get_page(ac->ac_buddy_page); 1664c9de560dSAlex Tomas /* store last allocated for subsequent stream allocation */ 16654ba74d00STheodore Ts'o if (ac->ac_flags & EXT4_MB_STREAM_ALLOC) { 1666c9de560dSAlex Tomas spin_lock(&sbi->s_md_lock); 1667c9de560dSAlex Tomas sbi->s_mb_last_group = ac->ac_f_ex.fe_group; 1668c9de560dSAlex Tomas sbi->s_mb_last_start = ac->ac_f_ex.fe_start; 1669c9de560dSAlex Tomas spin_unlock(&sbi->s_md_lock); 1670c9de560dSAlex Tomas } 1671c9de560dSAlex Tomas } 1672c9de560dSAlex Tomas 1673c9de560dSAlex Tomas /* 1674c9de560dSAlex Tomas * regular allocator, for general purposes allocation 1675c9de560dSAlex Tomas */ 1676c9de560dSAlex Tomas 1677c9de560dSAlex Tomas static void ext4_mb_check_limits(struct ext4_allocation_context *ac, 1678c9de560dSAlex Tomas struct ext4_buddy *e4b, 1679c9de560dSAlex Tomas int finish_group) 1680c9de560dSAlex Tomas { 1681c9de560dSAlex Tomas struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); 1682c9de560dSAlex Tomas struct ext4_free_extent *bex = &ac->ac_b_ex; 1683c9de560dSAlex Tomas struct ext4_free_extent *gex = &ac->ac_g_ex; 1684c9de560dSAlex Tomas struct ext4_free_extent ex; 1685c9de560dSAlex Tomas int max; 1686c9de560dSAlex Tomas 1687032115fcSAneesh Kumar K.V if (ac->ac_status == AC_STATUS_FOUND) 1688032115fcSAneesh Kumar K.V return; 1689c9de560dSAlex Tomas /* 1690c9de560dSAlex Tomas * We don't want to scan for a whole year 1691c9de560dSAlex Tomas */ 1692c9de560dSAlex Tomas if (ac->ac_found > sbi->s_mb_max_to_scan && 1693c9de560dSAlex Tomas !(ac->ac_flags & EXT4_MB_HINT_FIRST)) { 1694c9de560dSAlex Tomas ac->ac_status = AC_STATUS_BREAK; 1695c9de560dSAlex Tomas return; 1696c9de560dSAlex Tomas } 1697c9de560dSAlex Tomas 1698c9de560dSAlex Tomas /* 1699c9de560dSAlex Tomas * Haven't found good chunk so far, let's continue 1700c9de560dSAlex Tomas */ 1701c9de560dSAlex Tomas if (bex->fe_len < gex->fe_len) 1702c9de560dSAlex Tomas return; 1703c9de560dSAlex Tomas 1704c9de560dSAlex Tomas if ((finish_group || ac->ac_found > sbi->s_mb_min_to_scan) 1705c9de560dSAlex Tomas && bex->fe_group == e4b->bd_group) { 1706c9de560dSAlex Tomas /* recheck chunk's availability - we don't know 1707c9de560dSAlex Tomas * when it was found (within this lock-unlock 1708c9de560dSAlex Tomas * period or not) */ 170915c006a2SRobin Dong max = mb_find_extent(e4b, bex->fe_start, gex->fe_len, &ex); 1710c9de560dSAlex Tomas if (max >= gex->fe_len) { 1711c9de560dSAlex Tomas ext4_mb_use_best_found(ac, e4b); 1712c9de560dSAlex Tomas return; 1713c9de560dSAlex Tomas } 1714c9de560dSAlex Tomas } 1715c9de560dSAlex Tomas } 1716c9de560dSAlex Tomas 1717c9de560dSAlex Tomas /* 1718c9de560dSAlex Tomas * The routine checks whether found extent is good enough. If it is, 1719c9de560dSAlex Tomas * then the extent gets marked used and flag is set to the context 1720c9de560dSAlex Tomas * to stop scanning. Otherwise, the extent is compared with the 1721c9de560dSAlex Tomas * previous found extent and if new one is better, then it's stored 1722c9de560dSAlex Tomas * in the context. Later, the best found extent will be used, if 1723c9de560dSAlex Tomas * mballoc can't find good enough extent. 1724c9de560dSAlex Tomas * 1725c9de560dSAlex Tomas * FIXME: real allocation policy is to be designed yet! 1726c9de560dSAlex Tomas */ 1727c9de560dSAlex Tomas static void ext4_mb_measure_extent(struct ext4_allocation_context *ac, 1728c9de560dSAlex Tomas struct ext4_free_extent *ex, 1729c9de560dSAlex Tomas struct ext4_buddy *e4b) 1730c9de560dSAlex Tomas { 1731c9de560dSAlex Tomas struct ext4_free_extent *bex = &ac->ac_b_ex; 1732c9de560dSAlex Tomas struct ext4_free_extent *gex = &ac->ac_g_ex; 1733c9de560dSAlex Tomas 1734c9de560dSAlex Tomas BUG_ON(ex->fe_len <= 0); 17357137d7a4STheodore Ts'o BUG_ON(ex->fe_len > EXT4_CLUSTERS_PER_GROUP(ac->ac_sb)); 17367137d7a4STheodore Ts'o BUG_ON(ex->fe_start >= EXT4_CLUSTERS_PER_GROUP(ac->ac_sb)); 1737c9de560dSAlex Tomas BUG_ON(ac->ac_status != AC_STATUS_CONTINUE); 1738c9de560dSAlex Tomas 1739c9de560dSAlex Tomas ac->ac_found++; 1740c9de560dSAlex Tomas 1741c9de560dSAlex Tomas /* 1742c9de560dSAlex Tomas * The special case - take what you catch first 1743c9de560dSAlex Tomas */ 1744c9de560dSAlex Tomas if (unlikely(ac->ac_flags & EXT4_MB_HINT_FIRST)) { 1745c9de560dSAlex Tomas *bex = *ex; 1746c9de560dSAlex Tomas ext4_mb_use_best_found(ac, e4b); 1747c9de560dSAlex Tomas return; 1748c9de560dSAlex Tomas } 1749c9de560dSAlex Tomas 1750c9de560dSAlex Tomas /* 1751c9de560dSAlex Tomas * Let's check whether the chuck is good enough 1752c9de560dSAlex Tomas */ 1753c9de560dSAlex Tomas if (ex->fe_len == gex->fe_len) { 1754c9de560dSAlex Tomas *bex = *ex; 1755c9de560dSAlex Tomas ext4_mb_use_best_found(ac, e4b); 1756c9de560dSAlex Tomas return; 1757c9de560dSAlex Tomas } 1758c9de560dSAlex Tomas 1759c9de560dSAlex Tomas /* 1760c9de560dSAlex Tomas * If this is first found extent, just store it in the context 1761c9de560dSAlex Tomas */ 1762c9de560dSAlex Tomas if (bex->fe_len == 0) { 1763c9de560dSAlex Tomas *bex = *ex; 1764c9de560dSAlex Tomas return; 1765c9de560dSAlex Tomas } 1766c9de560dSAlex Tomas 1767c9de560dSAlex Tomas /* 1768c9de560dSAlex Tomas * If new found extent is better, store it in the context 1769c9de560dSAlex Tomas */ 1770c9de560dSAlex Tomas if (bex->fe_len < gex->fe_len) { 1771c9de560dSAlex Tomas /* if the request isn't satisfied, any found extent 1772c9de560dSAlex Tomas * larger than previous best one is better */ 1773c9de560dSAlex Tomas if (ex->fe_len > bex->fe_len) 1774c9de560dSAlex Tomas *bex = *ex; 1775c9de560dSAlex Tomas } else if (ex->fe_len > gex->fe_len) { 1776c9de560dSAlex Tomas /* if the request is satisfied, then we try to find 1777c9de560dSAlex Tomas * an extent that still satisfy the request, but is 1778c9de560dSAlex Tomas * smaller than previous one */ 1779c9de560dSAlex Tomas if (ex->fe_len < bex->fe_len) 1780c9de560dSAlex Tomas *bex = *ex; 1781c9de560dSAlex Tomas } 1782c9de560dSAlex Tomas 1783c9de560dSAlex Tomas ext4_mb_check_limits(ac, e4b, 0); 1784c9de560dSAlex Tomas } 1785c9de560dSAlex Tomas 1786089ceeccSEric Sandeen static noinline_for_stack 1787089ceeccSEric Sandeen int ext4_mb_try_best_found(struct ext4_allocation_context *ac, 1788c9de560dSAlex Tomas struct ext4_buddy *e4b) 1789c9de560dSAlex Tomas { 1790c9de560dSAlex Tomas struct ext4_free_extent ex = ac->ac_b_ex; 1791c9de560dSAlex Tomas ext4_group_t group = ex.fe_group; 1792c9de560dSAlex Tomas int max; 1793c9de560dSAlex Tomas int err; 1794c9de560dSAlex Tomas 1795c9de560dSAlex Tomas BUG_ON(ex.fe_len <= 0); 1796c9de560dSAlex Tomas err = ext4_mb_load_buddy(ac->ac_sb, group, e4b); 1797c9de560dSAlex Tomas if (err) 1798c9de560dSAlex Tomas return err; 1799c9de560dSAlex Tomas 1800c9de560dSAlex Tomas ext4_lock_group(ac->ac_sb, group); 180115c006a2SRobin Dong max = mb_find_extent(e4b, ex.fe_start, ex.fe_len, &ex); 1802c9de560dSAlex Tomas 1803c9de560dSAlex Tomas if (max > 0) { 1804c9de560dSAlex Tomas ac->ac_b_ex = ex; 1805c9de560dSAlex Tomas ext4_mb_use_best_found(ac, e4b); 1806c9de560dSAlex Tomas } 1807c9de560dSAlex Tomas 1808c9de560dSAlex Tomas ext4_unlock_group(ac->ac_sb, group); 1809e39e07fdSJing Zhang ext4_mb_unload_buddy(e4b); 1810c9de560dSAlex Tomas 1811c9de560dSAlex Tomas return 0; 1812c9de560dSAlex Tomas } 1813c9de560dSAlex Tomas 1814089ceeccSEric Sandeen static noinline_for_stack 1815089ceeccSEric Sandeen int ext4_mb_find_by_goal(struct ext4_allocation_context *ac, 1816c9de560dSAlex Tomas struct ext4_buddy *e4b) 1817c9de560dSAlex Tomas { 1818c9de560dSAlex Tomas ext4_group_t group = ac->ac_g_ex.fe_group; 1819c9de560dSAlex Tomas int max; 1820c9de560dSAlex Tomas int err; 1821c9de560dSAlex Tomas struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); 1822838cd0cfSYongqiang Yang struct ext4_group_info *grp = ext4_get_group_info(ac->ac_sb, group); 1823c9de560dSAlex Tomas struct ext4_free_extent ex; 1824c9de560dSAlex Tomas 1825c9de560dSAlex Tomas if (!(ac->ac_flags & EXT4_MB_HINT_TRY_GOAL)) 1826c9de560dSAlex Tomas return 0; 1827838cd0cfSYongqiang Yang if (grp->bb_free == 0) 1828838cd0cfSYongqiang Yang return 0; 1829c9de560dSAlex Tomas 1830c9de560dSAlex Tomas err = ext4_mb_load_buddy(ac->ac_sb, group, e4b); 1831c9de560dSAlex Tomas if (err) 1832c9de560dSAlex Tomas return err; 1833c9de560dSAlex Tomas 1834163a203dSDarrick J. Wong if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info))) { 1835163a203dSDarrick J. Wong ext4_mb_unload_buddy(e4b); 1836163a203dSDarrick J. Wong return 0; 1837163a203dSDarrick J. Wong } 1838163a203dSDarrick J. Wong 1839c9de560dSAlex Tomas ext4_lock_group(ac->ac_sb, group); 184015c006a2SRobin Dong max = mb_find_extent(e4b, ac->ac_g_ex.fe_start, 1841c9de560dSAlex Tomas ac->ac_g_ex.fe_len, &ex); 1842ab0c00fcSTheodore Ts'o ex.fe_logical = 0xDEADFA11; /* debug value */ 1843c9de560dSAlex Tomas 1844c9de560dSAlex Tomas if (max >= ac->ac_g_ex.fe_len && ac->ac_g_ex.fe_len == sbi->s_stripe) { 1845c9de560dSAlex Tomas ext4_fsblk_t start; 1846c9de560dSAlex Tomas 18475661bd68SAkinobu Mita start = ext4_group_first_block_no(ac->ac_sb, e4b->bd_group) + 18485661bd68SAkinobu Mita ex.fe_start; 1849c9de560dSAlex Tomas /* use do_div to get remainder (would be 64-bit modulo) */ 1850c9de560dSAlex Tomas if (do_div(start, sbi->s_stripe) == 0) { 1851c9de560dSAlex Tomas ac->ac_found++; 1852c9de560dSAlex Tomas ac->ac_b_ex = ex; 1853c9de560dSAlex Tomas ext4_mb_use_best_found(ac, e4b); 1854c9de560dSAlex Tomas } 1855c9de560dSAlex Tomas } else if (max >= ac->ac_g_ex.fe_len) { 1856c9de560dSAlex Tomas BUG_ON(ex.fe_len <= 0); 1857c9de560dSAlex Tomas BUG_ON(ex.fe_group != ac->ac_g_ex.fe_group); 1858c9de560dSAlex Tomas BUG_ON(ex.fe_start != ac->ac_g_ex.fe_start); 1859c9de560dSAlex Tomas ac->ac_found++; 1860c9de560dSAlex Tomas ac->ac_b_ex = ex; 1861c9de560dSAlex Tomas ext4_mb_use_best_found(ac, e4b); 1862c9de560dSAlex Tomas } else if (max > 0 && (ac->ac_flags & EXT4_MB_HINT_MERGE)) { 1863c9de560dSAlex Tomas /* Sometimes, caller may want to merge even small 1864c9de560dSAlex Tomas * number of blocks to an existing extent */ 1865c9de560dSAlex Tomas BUG_ON(ex.fe_len <= 0); 1866c9de560dSAlex Tomas BUG_ON(ex.fe_group != ac->ac_g_ex.fe_group); 1867c9de560dSAlex Tomas BUG_ON(ex.fe_start != ac->ac_g_ex.fe_start); 1868c9de560dSAlex Tomas ac->ac_found++; 1869c9de560dSAlex Tomas ac->ac_b_ex = ex; 1870c9de560dSAlex Tomas ext4_mb_use_best_found(ac, e4b); 1871c9de560dSAlex Tomas } 1872c9de560dSAlex Tomas ext4_unlock_group(ac->ac_sb, group); 1873e39e07fdSJing Zhang ext4_mb_unload_buddy(e4b); 1874c9de560dSAlex Tomas 1875c9de560dSAlex Tomas return 0; 1876c9de560dSAlex Tomas } 1877c9de560dSAlex Tomas 1878c9de560dSAlex Tomas /* 1879c9de560dSAlex Tomas * The routine scans buddy structures (not bitmap!) from given order 1880c9de560dSAlex Tomas * to max order and tries to find big enough chunk to satisfy the req 1881c9de560dSAlex Tomas */ 1882089ceeccSEric Sandeen static noinline_for_stack 1883089ceeccSEric Sandeen void ext4_mb_simple_scan_group(struct ext4_allocation_context *ac, 1884c9de560dSAlex Tomas struct ext4_buddy *e4b) 1885c9de560dSAlex Tomas { 1886c9de560dSAlex Tomas struct super_block *sb = ac->ac_sb; 1887c9de560dSAlex Tomas struct ext4_group_info *grp = e4b->bd_info; 1888c9de560dSAlex Tomas void *buddy; 1889c9de560dSAlex Tomas int i; 1890c9de560dSAlex Tomas int k; 1891c9de560dSAlex Tomas int max; 1892c9de560dSAlex Tomas 1893c9de560dSAlex Tomas BUG_ON(ac->ac_2order <= 0); 1894c9de560dSAlex Tomas for (i = ac->ac_2order; i <= sb->s_blocksize_bits + 1; i++) { 1895c9de560dSAlex Tomas if (grp->bb_counters[i] == 0) 1896c9de560dSAlex Tomas continue; 1897c9de560dSAlex Tomas 1898c9de560dSAlex Tomas buddy = mb_find_buddy(e4b, i, &max); 1899c9de560dSAlex Tomas BUG_ON(buddy == NULL); 1900c9de560dSAlex Tomas 1901ffad0a44SAneesh Kumar K.V k = mb_find_next_zero_bit(buddy, max, 0); 1902c9de560dSAlex Tomas BUG_ON(k >= max); 1903c9de560dSAlex Tomas 1904c9de560dSAlex Tomas ac->ac_found++; 1905c9de560dSAlex Tomas 1906c9de560dSAlex Tomas ac->ac_b_ex.fe_len = 1 << i; 1907c9de560dSAlex Tomas ac->ac_b_ex.fe_start = k << i; 1908c9de560dSAlex Tomas ac->ac_b_ex.fe_group = e4b->bd_group; 1909c9de560dSAlex Tomas 1910c9de560dSAlex Tomas ext4_mb_use_best_found(ac, e4b); 1911c9de560dSAlex Tomas 1912c9de560dSAlex Tomas BUG_ON(ac->ac_b_ex.fe_len != ac->ac_g_ex.fe_len); 1913c9de560dSAlex Tomas 1914c9de560dSAlex Tomas if (EXT4_SB(sb)->s_mb_stats) 1915c9de560dSAlex Tomas atomic_inc(&EXT4_SB(sb)->s_bal_2orders); 1916c9de560dSAlex Tomas 1917c9de560dSAlex Tomas break; 1918c9de560dSAlex Tomas } 1919c9de560dSAlex Tomas } 1920c9de560dSAlex Tomas 1921c9de560dSAlex Tomas /* 1922c9de560dSAlex Tomas * The routine scans the group and measures all found extents. 1923c9de560dSAlex Tomas * In order to optimize scanning, caller must pass number of 1924c9de560dSAlex Tomas * free blocks in the group, so the routine can know upper limit. 1925c9de560dSAlex Tomas */ 1926089ceeccSEric Sandeen static noinline_for_stack 1927089ceeccSEric Sandeen void ext4_mb_complex_scan_group(struct ext4_allocation_context *ac, 1928c9de560dSAlex Tomas struct ext4_buddy *e4b) 1929c9de560dSAlex Tomas { 1930c9de560dSAlex Tomas struct super_block *sb = ac->ac_sb; 1931c5e8f3f3STheodore Ts'o void *bitmap = e4b->bd_bitmap; 1932c9de560dSAlex Tomas struct ext4_free_extent ex; 1933c9de560dSAlex Tomas int i; 1934c9de560dSAlex Tomas int free; 1935c9de560dSAlex Tomas 1936c9de560dSAlex Tomas free = e4b->bd_info->bb_free; 1937c9de560dSAlex Tomas BUG_ON(free <= 0); 1938c9de560dSAlex Tomas 1939c9de560dSAlex Tomas i = e4b->bd_info->bb_first_free; 1940c9de560dSAlex Tomas 1941c9de560dSAlex Tomas while (free && ac->ac_status == AC_STATUS_CONTINUE) { 1942ffad0a44SAneesh Kumar K.V i = mb_find_next_zero_bit(bitmap, 19437137d7a4STheodore Ts'o EXT4_CLUSTERS_PER_GROUP(sb), i); 19447137d7a4STheodore Ts'o if (i >= EXT4_CLUSTERS_PER_GROUP(sb)) { 194526346ff6SAneesh Kumar K.V /* 1946e56eb659SAneesh Kumar K.V * IF we have corrupt bitmap, we won't find any 194726346ff6SAneesh Kumar K.V * free blocks even though group info says we 194826346ff6SAneesh Kumar K.V * we have free blocks 194926346ff6SAneesh Kumar K.V */ 1950e29136f8STheodore Ts'o ext4_grp_locked_error(sb, e4b->bd_group, 0, 0, 195153accfa9STheodore Ts'o "%d free clusters as per " 1952fde4d95aSTheodore Ts'o "group info. But bitmap says 0", 195326346ff6SAneesh Kumar K.V free); 1954c9de560dSAlex Tomas break; 1955c9de560dSAlex Tomas } 1956c9de560dSAlex Tomas 195715c006a2SRobin Dong mb_find_extent(e4b, i, ac->ac_g_ex.fe_len, &ex); 1958c9de560dSAlex Tomas BUG_ON(ex.fe_len <= 0); 195926346ff6SAneesh Kumar K.V if (free < ex.fe_len) { 1960e29136f8STheodore Ts'o ext4_grp_locked_error(sb, e4b->bd_group, 0, 0, 196153accfa9STheodore Ts'o "%d free clusters as per " 1962fde4d95aSTheodore Ts'o "group info. But got %d blocks", 196326346ff6SAneesh Kumar K.V free, ex.fe_len); 1964e56eb659SAneesh Kumar K.V /* 1965e56eb659SAneesh Kumar K.V * The number of free blocks differs. This mostly 1966e56eb659SAneesh Kumar K.V * indicate that the bitmap is corrupt. So exit 1967e56eb659SAneesh Kumar K.V * without claiming the space. 1968e56eb659SAneesh Kumar K.V */ 1969e56eb659SAneesh Kumar K.V break; 197026346ff6SAneesh Kumar K.V } 1971ab0c00fcSTheodore Ts'o ex.fe_logical = 0xDEADC0DE; /* debug value */ 1972c9de560dSAlex Tomas ext4_mb_measure_extent(ac, &ex, e4b); 1973c9de560dSAlex Tomas 1974c9de560dSAlex Tomas i += ex.fe_len; 1975c9de560dSAlex Tomas free -= ex.fe_len; 1976c9de560dSAlex Tomas } 1977c9de560dSAlex Tomas 1978c9de560dSAlex Tomas ext4_mb_check_limits(ac, e4b, 1); 1979c9de560dSAlex Tomas } 1980c9de560dSAlex Tomas 1981c9de560dSAlex Tomas /* 1982c9de560dSAlex Tomas * This is a special case for storages like raid5 1983506bf2d8SEric Sandeen * we try to find stripe-aligned chunks for stripe-size-multiple requests 1984c9de560dSAlex Tomas */ 1985089ceeccSEric Sandeen static noinline_for_stack 1986089ceeccSEric Sandeen void ext4_mb_scan_aligned(struct ext4_allocation_context *ac, 1987c9de560dSAlex Tomas struct ext4_buddy *e4b) 1988c9de560dSAlex Tomas { 1989c9de560dSAlex Tomas struct super_block *sb = ac->ac_sb; 1990c9de560dSAlex Tomas struct ext4_sb_info *sbi = EXT4_SB(sb); 1991c5e8f3f3STheodore Ts'o void *bitmap = e4b->bd_bitmap; 1992c9de560dSAlex Tomas struct ext4_free_extent ex; 1993c9de560dSAlex Tomas ext4_fsblk_t first_group_block; 1994c9de560dSAlex Tomas ext4_fsblk_t a; 1995c9de560dSAlex Tomas ext4_grpblk_t i; 1996c9de560dSAlex Tomas int max; 1997c9de560dSAlex Tomas 1998c9de560dSAlex Tomas BUG_ON(sbi->s_stripe == 0); 1999c9de560dSAlex Tomas 2000c9de560dSAlex Tomas /* find first stripe-aligned block in group */ 20015661bd68SAkinobu Mita first_group_block = ext4_group_first_block_no(sb, e4b->bd_group); 20025661bd68SAkinobu Mita 2003c9de560dSAlex Tomas a = first_group_block + sbi->s_stripe - 1; 2004c9de560dSAlex Tomas do_div(a, sbi->s_stripe); 2005c9de560dSAlex Tomas i = (a * sbi->s_stripe) - first_group_block; 2006c9de560dSAlex Tomas 20077137d7a4STheodore Ts'o while (i < EXT4_CLUSTERS_PER_GROUP(sb)) { 2008c9de560dSAlex Tomas if (!mb_test_bit(i, bitmap)) { 200915c006a2SRobin Dong max = mb_find_extent(e4b, i, sbi->s_stripe, &ex); 2010c9de560dSAlex Tomas if (max >= sbi->s_stripe) { 2011c9de560dSAlex Tomas ac->ac_found++; 2012ab0c00fcSTheodore Ts'o ex.fe_logical = 0xDEADF00D; /* debug value */ 2013c9de560dSAlex Tomas ac->ac_b_ex = ex; 2014c9de560dSAlex Tomas ext4_mb_use_best_found(ac, e4b); 2015c9de560dSAlex Tomas break; 2016c9de560dSAlex Tomas } 2017c9de560dSAlex Tomas } 2018c9de560dSAlex Tomas i += sbi->s_stripe; 2019c9de560dSAlex Tomas } 2020c9de560dSAlex Tomas } 2021c9de560dSAlex Tomas 202242ac1848SLukas Czerner /* 202342ac1848SLukas Czerner * This is now called BEFORE we load the buddy bitmap. 202442ac1848SLukas Czerner * Returns either 1 or 0 indicating that the group is either suitable 202542ac1848SLukas Czerner * for the allocation or not. In addition it can also return negative 202642ac1848SLukas Czerner * error code when something goes wrong. 202742ac1848SLukas Czerner */ 2028c9de560dSAlex Tomas static int ext4_mb_good_group(struct ext4_allocation_context *ac, 2029c9de560dSAlex Tomas ext4_group_t group, int cr) 2030c9de560dSAlex Tomas { 2031c9de560dSAlex Tomas unsigned free, fragments; 2032a4912123STheodore Ts'o int flex_size = ext4_flex_bg_size(EXT4_SB(ac->ac_sb)); 2033c9de560dSAlex Tomas struct ext4_group_info *grp = ext4_get_group_info(ac->ac_sb, group); 2034c9de560dSAlex Tomas 2035c9de560dSAlex Tomas BUG_ON(cr < 0 || cr >= 4); 20368a57d9d6SCurt Wohlgemuth 203701fc48e8STheodore Ts'o free = grp->bb_free; 203801fc48e8STheodore Ts'o if (free == 0) 203901fc48e8STheodore Ts'o return 0; 204001fc48e8STheodore Ts'o if (cr <= 2 && free < ac->ac_g_ex.fe_len) 204101fc48e8STheodore Ts'o return 0; 204201fc48e8STheodore Ts'o 2043163a203dSDarrick J. Wong if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(grp))) 2044163a203dSDarrick J. Wong return 0; 2045163a203dSDarrick J. Wong 20468a57d9d6SCurt Wohlgemuth /* We only do this if the grp has never been initialized */ 20478a57d9d6SCurt Wohlgemuth if (unlikely(EXT4_MB_GRP_NEED_INIT(grp))) { 20488a57d9d6SCurt Wohlgemuth int ret = ext4_mb_init_group(ac->ac_sb, group); 20498a57d9d6SCurt Wohlgemuth if (ret) 205042ac1848SLukas Czerner return ret; 20518a57d9d6SCurt Wohlgemuth } 2052c9de560dSAlex Tomas 2053c9de560dSAlex Tomas fragments = grp->bb_fragments; 2054c9de560dSAlex Tomas if (fragments == 0) 2055c9de560dSAlex Tomas return 0; 2056c9de560dSAlex Tomas 2057c9de560dSAlex Tomas switch (cr) { 2058c9de560dSAlex Tomas case 0: 2059c9de560dSAlex Tomas BUG_ON(ac->ac_2order == 0); 2060c9de560dSAlex Tomas 2061a4912123STheodore Ts'o /* Avoid using the first bg of a flexgroup for data files */ 2062a4912123STheodore Ts'o if ((ac->ac_flags & EXT4_MB_HINT_DATA) && 2063a4912123STheodore Ts'o (flex_size >= EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME) && 2064a4912123STheodore Ts'o ((group % flex_size) == 0)) 2065a4912123STheodore Ts'o return 0; 2066a4912123STheodore Ts'o 206740ae3487STheodore Ts'o if ((ac->ac_2order > ac->ac_sb->s_blocksize_bits+1) || 206840ae3487STheodore Ts'o (free / fragments) >= ac->ac_g_ex.fe_len) 206940ae3487STheodore Ts'o return 1; 207040ae3487STheodore Ts'o 207140ae3487STheodore Ts'o if (grp->bb_largest_free_order < ac->ac_2order) 207240ae3487STheodore Ts'o return 0; 207340ae3487STheodore Ts'o 2074c9de560dSAlex Tomas return 1; 2075c9de560dSAlex Tomas case 1: 2076c9de560dSAlex Tomas if ((free / fragments) >= ac->ac_g_ex.fe_len) 2077c9de560dSAlex Tomas return 1; 2078c9de560dSAlex Tomas break; 2079c9de560dSAlex Tomas case 2: 2080c9de560dSAlex Tomas if (free >= ac->ac_g_ex.fe_len) 2081c9de560dSAlex Tomas return 1; 2082c9de560dSAlex Tomas break; 2083c9de560dSAlex Tomas case 3: 2084c9de560dSAlex Tomas return 1; 2085c9de560dSAlex Tomas default: 2086c9de560dSAlex Tomas BUG(); 2087c9de560dSAlex Tomas } 2088c9de560dSAlex Tomas 2089c9de560dSAlex Tomas return 0; 2090c9de560dSAlex Tomas } 2091c9de560dSAlex Tomas 20924ddfef7bSEric Sandeen static noinline_for_stack int 20934ddfef7bSEric Sandeen ext4_mb_regular_allocator(struct ext4_allocation_context *ac) 2094c9de560dSAlex Tomas { 20958df9675fSTheodore Ts'o ext4_group_t ngroups, group, i; 2096c9de560dSAlex Tomas int cr; 209742ac1848SLukas Czerner int err = 0, first_err = 0; 2098c9de560dSAlex Tomas struct ext4_sb_info *sbi; 2099c9de560dSAlex Tomas struct super_block *sb; 2100c9de560dSAlex Tomas struct ext4_buddy e4b; 2101c9de560dSAlex Tomas 2102c9de560dSAlex Tomas sb = ac->ac_sb; 2103c9de560dSAlex Tomas sbi = EXT4_SB(sb); 21048df9675fSTheodore Ts'o ngroups = ext4_get_groups_count(sb); 2105fb0a387dSEric Sandeen /* non-extent files are limited to low blocks/groups */ 210612e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(ac->ac_inode, EXT4_INODE_EXTENTS))) 2107fb0a387dSEric Sandeen ngroups = sbi->s_blockfile_groups; 2108fb0a387dSEric Sandeen 2109c9de560dSAlex Tomas BUG_ON(ac->ac_status == AC_STATUS_FOUND); 2110c9de560dSAlex Tomas 2111c9de560dSAlex Tomas /* first, try the goal */ 2112c9de560dSAlex Tomas err = ext4_mb_find_by_goal(ac, &e4b); 2113c9de560dSAlex Tomas if (err || ac->ac_status == AC_STATUS_FOUND) 2114c9de560dSAlex Tomas goto out; 2115c9de560dSAlex Tomas 2116c9de560dSAlex Tomas if (unlikely(ac->ac_flags & EXT4_MB_HINT_GOAL_ONLY)) 2117c9de560dSAlex Tomas goto out; 2118c9de560dSAlex Tomas 2119c9de560dSAlex Tomas /* 2120c9de560dSAlex Tomas * ac->ac2_order is set only if the fe_len is a power of 2 2121c9de560dSAlex Tomas * if ac2_order is set we also set criteria to 0 so that we 2122c9de560dSAlex Tomas * try exact allocation using buddy. 2123c9de560dSAlex Tomas */ 2124c9de560dSAlex Tomas i = fls(ac->ac_g_ex.fe_len); 2125c9de560dSAlex Tomas ac->ac_2order = 0; 2126c9de560dSAlex Tomas /* 2127c9de560dSAlex Tomas * We search using buddy data only if the order of the request 2128c9de560dSAlex Tomas * is greater than equal to the sbi_s_mb_order2_reqs 2129b713a5ecSTheodore Ts'o * You can tune it via /sys/fs/ext4/<partition>/mb_order2_req 2130c9de560dSAlex Tomas */ 2131c9de560dSAlex Tomas if (i >= sbi->s_mb_order2_reqs) { 2132c9de560dSAlex Tomas /* 2133c9de560dSAlex Tomas * This should tell if fe_len is exactly power of 2 2134c9de560dSAlex Tomas */ 2135c9de560dSAlex Tomas if ((ac->ac_g_ex.fe_len & (~(1 << (i - 1)))) == 0) 2136c9de560dSAlex Tomas ac->ac_2order = i - 1; 2137c9de560dSAlex Tomas } 2138c9de560dSAlex Tomas 21394ba74d00STheodore Ts'o /* if stream allocation is enabled, use global goal */ 21404ba74d00STheodore Ts'o if (ac->ac_flags & EXT4_MB_STREAM_ALLOC) { 2141c9de560dSAlex Tomas /* TBD: may be hot point */ 2142c9de560dSAlex Tomas spin_lock(&sbi->s_md_lock); 2143c9de560dSAlex Tomas ac->ac_g_ex.fe_group = sbi->s_mb_last_group; 2144c9de560dSAlex Tomas ac->ac_g_ex.fe_start = sbi->s_mb_last_start; 2145c9de560dSAlex Tomas spin_unlock(&sbi->s_md_lock); 2146c9de560dSAlex Tomas } 21474ba74d00STheodore Ts'o 2148c9de560dSAlex Tomas /* Let's just scan groups to find more-less suitable blocks */ 2149c9de560dSAlex Tomas cr = ac->ac_2order ? 0 : 1; 2150c9de560dSAlex Tomas /* 2151c9de560dSAlex Tomas * cr == 0 try to get exact allocation, 2152c9de560dSAlex Tomas * cr == 3 try to get anything 2153c9de560dSAlex Tomas */ 2154c9de560dSAlex Tomas repeat: 2155c9de560dSAlex Tomas for (; cr < 4 && ac->ac_status == AC_STATUS_CONTINUE; cr++) { 2156c9de560dSAlex Tomas ac->ac_criteria = cr; 2157ed8f9c75SAneesh Kumar K.V /* 2158ed8f9c75SAneesh Kumar K.V * searching for the right group start 2159ed8f9c75SAneesh Kumar K.V * from the goal value specified 2160ed8f9c75SAneesh Kumar K.V */ 2161ed8f9c75SAneesh Kumar K.V group = ac->ac_g_ex.fe_group; 2162ed8f9c75SAneesh Kumar K.V 21638df9675fSTheodore Ts'o for (i = 0; i < ngroups; group++, i++) { 216442ac1848SLukas Czerner int ret = 0; 21652ed5724dSTheodore Ts'o cond_resched(); 2166e6155736SLachlan McIlroy /* 2167e6155736SLachlan McIlroy * Artificially restricted ngroups for non-extent 2168e6155736SLachlan McIlroy * files makes group > ngroups possible on first loop. 2169e6155736SLachlan McIlroy */ 2170e6155736SLachlan McIlroy if (group >= ngroups) 2171c9de560dSAlex Tomas group = 0; 2172c9de560dSAlex Tomas 21738a57d9d6SCurt Wohlgemuth /* This now checks without needing the buddy page */ 217442ac1848SLukas Czerner ret = ext4_mb_good_group(ac, group, cr); 217542ac1848SLukas Czerner if (ret <= 0) { 217642ac1848SLukas Czerner if (!first_err) 217742ac1848SLukas Czerner first_err = ret; 2178c9de560dSAlex Tomas continue; 217942ac1848SLukas Czerner } 2180c9de560dSAlex Tomas 2181c9de560dSAlex Tomas err = ext4_mb_load_buddy(sb, group, &e4b); 2182c9de560dSAlex Tomas if (err) 2183c9de560dSAlex Tomas goto out; 2184c9de560dSAlex Tomas 2185c9de560dSAlex Tomas ext4_lock_group(sb, group); 21868a57d9d6SCurt Wohlgemuth 21878a57d9d6SCurt Wohlgemuth /* 21888a57d9d6SCurt Wohlgemuth * We need to check again after locking the 21898a57d9d6SCurt Wohlgemuth * block group 21908a57d9d6SCurt Wohlgemuth */ 219142ac1848SLukas Czerner ret = ext4_mb_good_group(ac, group, cr); 219242ac1848SLukas Czerner if (ret <= 0) { 2193c9de560dSAlex Tomas ext4_unlock_group(sb, group); 2194e39e07fdSJing Zhang ext4_mb_unload_buddy(&e4b); 219542ac1848SLukas Czerner if (!first_err) 219642ac1848SLukas Czerner first_err = ret; 2197c9de560dSAlex Tomas continue; 2198c9de560dSAlex Tomas } 2199c9de560dSAlex Tomas 2200c9de560dSAlex Tomas ac->ac_groups_scanned++; 220140ae3487STheodore Ts'o if (cr == 0 && ac->ac_2order < sb->s_blocksize_bits+2) 2202c9de560dSAlex Tomas ext4_mb_simple_scan_group(ac, &e4b); 2203506bf2d8SEric Sandeen else if (cr == 1 && sbi->s_stripe && 2204506bf2d8SEric Sandeen !(ac->ac_g_ex.fe_len % sbi->s_stripe)) 2205c9de560dSAlex Tomas ext4_mb_scan_aligned(ac, &e4b); 2206c9de560dSAlex Tomas else 2207c9de560dSAlex Tomas ext4_mb_complex_scan_group(ac, &e4b); 2208c9de560dSAlex Tomas 2209c9de560dSAlex Tomas ext4_unlock_group(sb, group); 2210e39e07fdSJing Zhang ext4_mb_unload_buddy(&e4b); 2211c9de560dSAlex Tomas 2212c9de560dSAlex Tomas if (ac->ac_status != AC_STATUS_CONTINUE) 2213c9de560dSAlex Tomas break; 2214c9de560dSAlex Tomas } 2215c9de560dSAlex Tomas } 2216c9de560dSAlex Tomas 2217c9de560dSAlex Tomas if (ac->ac_b_ex.fe_len > 0 && ac->ac_status != AC_STATUS_FOUND && 2218c9de560dSAlex Tomas !(ac->ac_flags & EXT4_MB_HINT_FIRST)) { 2219c9de560dSAlex Tomas /* 2220c9de560dSAlex Tomas * We've been searching too long. Let's try to allocate 2221c9de560dSAlex Tomas * the best chunk we've found so far 2222c9de560dSAlex Tomas */ 2223c9de560dSAlex Tomas 2224c9de560dSAlex Tomas ext4_mb_try_best_found(ac, &e4b); 2225c9de560dSAlex Tomas if (ac->ac_status != AC_STATUS_FOUND) { 2226c9de560dSAlex Tomas /* 2227c9de560dSAlex Tomas * Someone more lucky has already allocated it. 2228c9de560dSAlex Tomas * The only thing we can do is just take first 2229c9de560dSAlex Tomas * found block(s) 2230c9de560dSAlex Tomas printk(KERN_DEBUG "EXT4-fs: someone won our chunk\n"); 2231c9de560dSAlex Tomas */ 2232c9de560dSAlex Tomas ac->ac_b_ex.fe_group = 0; 2233c9de560dSAlex Tomas ac->ac_b_ex.fe_start = 0; 2234c9de560dSAlex Tomas ac->ac_b_ex.fe_len = 0; 2235c9de560dSAlex Tomas ac->ac_status = AC_STATUS_CONTINUE; 2236c9de560dSAlex Tomas ac->ac_flags |= EXT4_MB_HINT_FIRST; 2237c9de560dSAlex Tomas cr = 3; 2238c9de560dSAlex Tomas atomic_inc(&sbi->s_mb_lost_chunks); 2239c9de560dSAlex Tomas goto repeat; 2240c9de560dSAlex Tomas } 2241c9de560dSAlex Tomas } 2242c9de560dSAlex Tomas out: 224342ac1848SLukas Czerner if (!err && ac->ac_status != AC_STATUS_FOUND && first_err) 224442ac1848SLukas Czerner err = first_err; 2245c9de560dSAlex Tomas return err; 2246c9de560dSAlex Tomas } 2247c9de560dSAlex Tomas 2248c9de560dSAlex Tomas static void *ext4_mb_seq_groups_start(struct seq_file *seq, loff_t *pos) 2249c9de560dSAlex Tomas { 2250c9de560dSAlex Tomas struct super_block *sb = seq->private; 2251c9de560dSAlex Tomas ext4_group_t group; 2252c9de560dSAlex Tomas 22538df9675fSTheodore Ts'o if (*pos < 0 || *pos >= ext4_get_groups_count(sb)) 2254c9de560dSAlex Tomas return NULL; 2255c9de560dSAlex Tomas group = *pos + 1; 2256a9df9a49STheodore Ts'o return (void *) ((unsigned long) group); 2257c9de560dSAlex Tomas } 2258c9de560dSAlex Tomas 2259c9de560dSAlex Tomas static void *ext4_mb_seq_groups_next(struct seq_file *seq, void *v, loff_t *pos) 2260c9de560dSAlex Tomas { 2261c9de560dSAlex Tomas struct super_block *sb = seq->private; 2262c9de560dSAlex Tomas ext4_group_t group; 2263c9de560dSAlex Tomas 2264c9de560dSAlex Tomas ++*pos; 22658df9675fSTheodore Ts'o if (*pos < 0 || *pos >= ext4_get_groups_count(sb)) 2266c9de560dSAlex Tomas return NULL; 2267c9de560dSAlex Tomas group = *pos + 1; 2268a9df9a49STheodore Ts'o return (void *) ((unsigned long) group); 2269c9de560dSAlex Tomas } 2270c9de560dSAlex Tomas 2271c9de560dSAlex Tomas static int ext4_mb_seq_groups_show(struct seq_file *seq, void *v) 2272c9de560dSAlex Tomas { 2273c9de560dSAlex Tomas struct super_block *sb = seq->private; 2274a9df9a49STheodore Ts'o ext4_group_t group = (ext4_group_t) ((unsigned long) v); 2275c9de560dSAlex Tomas int i; 22761c8457caSAditya Kali int err, buddy_loaded = 0; 2277c9de560dSAlex Tomas struct ext4_buddy e4b; 22781c8457caSAditya Kali struct ext4_group_info *grinfo; 2279c9de560dSAlex Tomas struct sg { 2280c9de560dSAlex Tomas struct ext4_group_info info; 2281a36b4498SEric Sandeen ext4_grpblk_t counters[16]; 2282c9de560dSAlex Tomas } sg; 2283c9de560dSAlex Tomas 2284c9de560dSAlex Tomas group--; 2285c9de560dSAlex Tomas if (group == 0) 228697b4af2fSRasmus Villemoes seq_puts(seq, "#group: free frags first [" 228797b4af2fSRasmus Villemoes " 2^0 2^1 2^2 2^3 2^4 2^5 2^6 " 2288802cf1f9SHuaitong Han " 2^7 2^8 2^9 2^10 2^11 2^12 2^13 ]\n"); 2289c9de560dSAlex Tomas 2290c9de560dSAlex Tomas i = (sb->s_blocksize_bits + 2) * sizeof(sg.info.bb_counters[0]) + 2291c9de560dSAlex Tomas sizeof(struct ext4_group_info); 22921c8457caSAditya Kali grinfo = ext4_get_group_info(sb, group); 22931c8457caSAditya Kali /* Load the group info in memory only if not already loaded. */ 22941c8457caSAditya Kali if (unlikely(EXT4_MB_GRP_NEED_INIT(grinfo))) { 2295c9de560dSAlex Tomas err = ext4_mb_load_buddy(sb, group, &e4b); 2296c9de560dSAlex Tomas if (err) { 2297a9df9a49STheodore Ts'o seq_printf(seq, "#%-5u: I/O error\n", group); 2298c9de560dSAlex Tomas return 0; 2299c9de560dSAlex Tomas } 23001c8457caSAditya Kali buddy_loaded = 1; 23011c8457caSAditya Kali } 23021c8457caSAditya Kali 2303c9de560dSAlex Tomas memcpy(&sg, ext4_get_group_info(sb, group), i); 23041c8457caSAditya Kali 23051c8457caSAditya Kali if (buddy_loaded) 2306e39e07fdSJing Zhang ext4_mb_unload_buddy(&e4b); 2307c9de560dSAlex Tomas 2308a9df9a49STheodore Ts'o seq_printf(seq, "#%-5u: %-5u %-5u %-5u [", group, sg.info.bb_free, 2309c9de560dSAlex Tomas sg.info.bb_fragments, sg.info.bb_first_free); 2310c9de560dSAlex Tomas for (i = 0; i <= 13; i++) 2311c9de560dSAlex Tomas seq_printf(seq, " %-5u", i <= sb->s_blocksize_bits + 1 ? 2312c9de560dSAlex Tomas sg.info.bb_counters[i] : 0); 2313c9de560dSAlex Tomas seq_printf(seq, " ]\n"); 2314c9de560dSAlex Tomas 2315c9de560dSAlex Tomas return 0; 2316c9de560dSAlex Tomas } 2317c9de560dSAlex Tomas 2318c9de560dSAlex Tomas static void ext4_mb_seq_groups_stop(struct seq_file *seq, void *v) 2319c9de560dSAlex Tomas { 2320c9de560dSAlex Tomas } 2321c9de560dSAlex Tomas 23227f1346a9STobias Klauser static const struct seq_operations ext4_mb_seq_groups_ops = { 2323c9de560dSAlex Tomas .start = ext4_mb_seq_groups_start, 2324c9de560dSAlex Tomas .next = ext4_mb_seq_groups_next, 2325c9de560dSAlex Tomas .stop = ext4_mb_seq_groups_stop, 2326c9de560dSAlex Tomas .show = ext4_mb_seq_groups_show, 2327c9de560dSAlex Tomas }; 2328c9de560dSAlex Tomas 2329c9de560dSAlex Tomas static int ext4_mb_seq_groups_open(struct inode *inode, struct file *file) 2330c9de560dSAlex Tomas { 2331d9dda78bSAl Viro struct super_block *sb = PDE_DATA(inode); 2332c9de560dSAlex Tomas int rc; 2333c9de560dSAlex Tomas 2334c9de560dSAlex Tomas rc = seq_open(file, &ext4_mb_seq_groups_ops); 2335c9de560dSAlex Tomas if (rc == 0) { 2336a271fe85SJoe Perches struct seq_file *m = file->private_data; 2337c9de560dSAlex Tomas m->private = sb; 2338c9de560dSAlex Tomas } 2339c9de560dSAlex Tomas return rc; 2340c9de560dSAlex Tomas 2341c9de560dSAlex Tomas } 2342c9de560dSAlex Tomas 2343ebd173beSTheodore Ts'o const struct file_operations ext4_seq_mb_groups_fops = { 2344c9de560dSAlex Tomas .owner = THIS_MODULE, 2345c9de560dSAlex Tomas .open = ext4_mb_seq_groups_open, 2346c9de560dSAlex Tomas .read = seq_read, 2347c9de560dSAlex Tomas .llseek = seq_lseek, 2348c9de560dSAlex Tomas .release = seq_release, 2349c9de560dSAlex Tomas }; 2350c9de560dSAlex Tomas 2351fb1813f4SCurt Wohlgemuth static struct kmem_cache *get_groupinfo_cache(int blocksize_bits) 2352fb1813f4SCurt Wohlgemuth { 2353fb1813f4SCurt Wohlgemuth int cache_index = blocksize_bits - EXT4_MIN_BLOCK_LOG_SIZE; 2354fb1813f4SCurt Wohlgemuth struct kmem_cache *cachep = ext4_groupinfo_caches[cache_index]; 2355fb1813f4SCurt Wohlgemuth 2356fb1813f4SCurt Wohlgemuth BUG_ON(!cachep); 2357fb1813f4SCurt Wohlgemuth return cachep; 2358fb1813f4SCurt Wohlgemuth } 23595f21b0e6SFrederic Bohe 236028623c2fSTheodore Ts'o /* 236128623c2fSTheodore Ts'o * Allocate the top-level s_group_info array for the specified number 236228623c2fSTheodore Ts'o * of groups 236328623c2fSTheodore Ts'o */ 236428623c2fSTheodore Ts'o int ext4_mb_alloc_groupinfo(struct super_block *sb, ext4_group_t ngroups) 236528623c2fSTheodore Ts'o { 236628623c2fSTheodore Ts'o struct ext4_sb_info *sbi = EXT4_SB(sb); 236728623c2fSTheodore Ts'o unsigned size; 236828623c2fSTheodore Ts'o struct ext4_group_info ***new_groupinfo; 236928623c2fSTheodore Ts'o 237028623c2fSTheodore Ts'o size = (ngroups + EXT4_DESC_PER_BLOCK(sb) - 1) >> 237128623c2fSTheodore Ts'o EXT4_DESC_PER_BLOCK_BITS(sb); 237228623c2fSTheodore Ts'o if (size <= sbi->s_group_info_size) 237328623c2fSTheodore Ts'o return 0; 237428623c2fSTheodore Ts'o 237528623c2fSTheodore Ts'o size = roundup_pow_of_two(sizeof(*sbi->s_group_info) * size); 237628623c2fSTheodore Ts'o new_groupinfo = ext4_kvzalloc(size, GFP_KERNEL); 237728623c2fSTheodore Ts'o if (!new_groupinfo) { 237828623c2fSTheodore Ts'o ext4_msg(sb, KERN_ERR, "can't allocate buddy meta group"); 237928623c2fSTheodore Ts'o return -ENOMEM; 238028623c2fSTheodore Ts'o } 238128623c2fSTheodore Ts'o if (sbi->s_group_info) { 238228623c2fSTheodore Ts'o memcpy(new_groupinfo, sbi->s_group_info, 238328623c2fSTheodore Ts'o sbi->s_group_info_size * sizeof(*sbi->s_group_info)); 2384b93b41d4SAl Viro kvfree(sbi->s_group_info); 238528623c2fSTheodore Ts'o } 238628623c2fSTheodore Ts'o sbi->s_group_info = new_groupinfo; 238728623c2fSTheodore Ts'o sbi->s_group_info_size = size / sizeof(*sbi->s_group_info); 238828623c2fSTheodore Ts'o ext4_debug("allocated s_groupinfo array for %d meta_bg's\n", 238928623c2fSTheodore Ts'o sbi->s_group_info_size); 239028623c2fSTheodore Ts'o return 0; 239128623c2fSTheodore Ts'o } 239228623c2fSTheodore Ts'o 23935f21b0e6SFrederic Bohe /* Create and initialize ext4_group_info data for the given group. */ 2394920313a7SAneesh Kumar K.V int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group, 23955f21b0e6SFrederic Bohe struct ext4_group_desc *desc) 23965f21b0e6SFrederic Bohe { 2397fb1813f4SCurt Wohlgemuth int i; 23985f21b0e6SFrederic Bohe int metalen = 0; 23995f21b0e6SFrederic Bohe struct ext4_sb_info *sbi = EXT4_SB(sb); 24005f21b0e6SFrederic Bohe struct ext4_group_info **meta_group_info; 2401fb1813f4SCurt Wohlgemuth struct kmem_cache *cachep = get_groupinfo_cache(sb->s_blocksize_bits); 24025f21b0e6SFrederic Bohe 24035f21b0e6SFrederic Bohe /* 24045f21b0e6SFrederic Bohe * First check if this group is the first of a reserved block. 24055f21b0e6SFrederic Bohe * If it's true, we have to allocate a new table of pointers 24065f21b0e6SFrederic Bohe * to ext4_group_info structures 24075f21b0e6SFrederic Bohe */ 24085f21b0e6SFrederic Bohe if (group % EXT4_DESC_PER_BLOCK(sb) == 0) { 24095f21b0e6SFrederic Bohe metalen = sizeof(*meta_group_info) << 24105f21b0e6SFrederic Bohe EXT4_DESC_PER_BLOCK_BITS(sb); 24114fdb5543SDmitry Monakhov meta_group_info = kmalloc(metalen, GFP_NOFS); 24125f21b0e6SFrederic Bohe if (meta_group_info == NULL) { 24137f6a11e7SJoe Perches ext4_msg(sb, KERN_ERR, "can't allocate mem " 24149d8b9ec4STheodore Ts'o "for a buddy group"); 24155f21b0e6SFrederic Bohe goto exit_meta_group_info; 24165f21b0e6SFrederic Bohe } 24175f21b0e6SFrederic Bohe sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)] = 24185f21b0e6SFrederic Bohe meta_group_info; 24195f21b0e6SFrederic Bohe } 24205f21b0e6SFrederic Bohe 24215f21b0e6SFrederic Bohe meta_group_info = 24225f21b0e6SFrederic Bohe sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)]; 24235f21b0e6SFrederic Bohe i = group & (EXT4_DESC_PER_BLOCK(sb) - 1); 24245f21b0e6SFrederic Bohe 24254fdb5543SDmitry Monakhov meta_group_info[i] = kmem_cache_zalloc(cachep, GFP_NOFS); 24265f21b0e6SFrederic Bohe if (meta_group_info[i] == NULL) { 24277f6a11e7SJoe Perches ext4_msg(sb, KERN_ERR, "can't allocate buddy mem"); 24285f21b0e6SFrederic Bohe goto exit_group_info; 24295f21b0e6SFrederic Bohe } 24305f21b0e6SFrederic Bohe set_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, 24315f21b0e6SFrederic Bohe &(meta_group_info[i]->bb_state)); 24325f21b0e6SFrederic Bohe 24335f21b0e6SFrederic Bohe /* 24345f21b0e6SFrederic Bohe * initialize bb_free to be able to skip 24355f21b0e6SFrederic Bohe * empty groups without initialization 24365f21b0e6SFrederic Bohe */ 24375f21b0e6SFrederic Bohe if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { 24385f21b0e6SFrederic Bohe meta_group_info[i]->bb_free = 2439cff1dfd7STheodore Ts'o ext4_free_clusters_after_init(sb, group, desc); 24405f21b0e6SFrederic Bohe } else { 24415f21b0e6SFrederic Bohe meta_group_info[i]->bb_free = 2442021b65bbSTheodore Ts'o ext4_free_group_clusters(sb, desc); 24435f21b0e6SFrederic Bohe } 24445f21b0e6SFrederic Bohe 24455f21b0e6SFrederic Bohe INIT_LIST_HEAD(&meta_group_info[i]->bb_prealloc_list); 2446920313a7SAneesh Kumar K.V init_rwsem(&meta_group_info[i]->alloc_sem); 244764e290ecSVenkatesh Pallipadi meta_group_info[i]->bb_free_root = RB_ROOT; 24488a57d9d6SCurt Wohlgemuth meta_group_info[i]->bb_largest_free_order = -1; /* uninit */ 24495f21b0e6SFrederic Bohe 24505f21b0e6SFrederic Bohe #ifdef DOUBLE_CHECK 24515f21b0e6SFrederic Bohe { 24525f21b0e6SFrederic Bohe struct buffer_head *bh; 24535f21b0e6SFrederic Bohe meta_group_info[i]->bb_bitmap = 24544fdb5543SDmitry Monakhov kmalloc(sb->s_blocksize, GFP_NOFS); 24555f21b0e6SFrederic Bohe BUG_ON(meta_group_info[i]->bb_bitmap == NULL); 24565f21b0e6SFrederic Bohe bh = ext4_read_block_bitmap(sb, group); 24579008a58eSDarrick J. Wong BUG_ON(IS_ERR_OR_NULL(bh)); 24585f21b0e6SFrederic Bohe memcpy(meta_group_info[i]->bb_bitmap, bh->b_data, 24595f21b0e6SFrederic Bohe sb->s_blocksize); 24605f21b0e6SFrederic Bohe put_bh(bh); 24615f21b0e6SFrederic Bohe } 24625f21b0e6SFrederic Bohe #endif 24635f21b0e6SFrederic Bohe 24645f21b0e6SFrederic Bohe return 0; 24655f21b0e6SFrederic Bohe 24665f21b0e6SFrederic Bohe exit_group_info: 24675f21b0e6SFrederic Bohe /* If a meta_group_info table has been allocated, release it now */ 2468caaf7a29STao Ma if (group % EXT4_DESC_PER_BLOCK(sb) == 0) { 24695f21b0e6SFrederic Bohe kfree(sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)]); 2470caaf7a29STao Ma sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)] = NULL; 2471caaf7a29STao Ma } 24725f21b0e6SFrederic Bohe exit_meta_group_info: 24735f21b0e6SFrederic Bohe return -ENOMEM; 24745f21b0e6SFrederic Bohe } /* ext4_mb_add_groupinfo */ 24755f21b0e6SFrederic Bohe 2476c9de560dSAlex Tomas static int ext4_mb_init_backend(struct super_block *sb) 2477c9de560dSAlex Tomas { 24788df9675fSTheodore Ts'o ext4_group_t ngroups = ext4_get_groups_count(sb); 2479c9de560dSAlex Tomas ext4_group_t i; 2480c9de560dSAlex Tomas struct ext4_sb_info *sbi = EXT4_SB(sb); 248128623c2fSTheodore Ts'o int err; 24825f21b0e6SFrederic Bohe struct ext4_group_desc *desc; 2483fb1813f4SCurt Wohlgemuth struct kmem_cache *cachep; 2484c9de560dSAlex Tomas 248528623c2fSTheodore Ts'o err = ext4_mb_alloc_groupinfo(sb, ngroups); 248628623c2fSTheodore Ts'o if (err) 248728623c2fSTheodore Ts'o return err; 24885f21b0e6SFrederic Bohe 2489c9de560dSAlex Tomas sbi->s_buddy_cache = new_inode(sb); 2490c9de560dSAlex Tomas if (sbi->s_buddy_cache == NULL) { 24919d8b9ec4STheodore Ts'o ext4_msg(sb, KERN_ERR, "can't get new inode"); 2492c9de560dSAlex Tomas goto err_freesgi; 2493c9de560dSAlex Tomas } 249448e6061bSYu Jian /* To avoid potentially colliding with an valid on-disk inode number, 249548e6061bSYu Jian * use EXT4_BAD_INO for the buddy cache inode number. This inode is 249648e6061bSYu Jian * not in the inode hash, so it should never be found by iget(), but 249748e6061bSYu Jian * this will avoid confusion if it ever shows up during debugging. */ 249848e6061bSYu Jian sbi->s_buddy_cache->i_ino = EXT4_BAD_INO; 2499c9de560dSAlex Tomas EXT4_I(sbi->s_buddy_cache)->i_disksize = 0; 25008df9675fSTheodore Ts'o for (i = 0; i < ngroups; i++) { 2501c9de560dSAlex Tomas desc = ext4_get_group_desc(sb, i, NULL); 2502c9de560dSAlex Tomas if (desc == NULL) { 25039d8b9ec4STheodore Ts'o ext4_msg(sb, KERN_ERR, "can't read descriptor %u", i); 2504c9de560dSAlex Tomas goto err_freebuddy; 2505c9de560dSAlex Tomas } 25065f21b0e6SFrederic Bohe if (ext4_mb_add_groupinfo(sb, i, desc) != 0) 25075f21b0e6SFrederic Bohe goto err_freebuddy; 2508c9de560dSAlex Tomas } 2509c9de560dSAlex Tomas 2510c9de560dSAlex Tomas return 0; 2511c9de560dSAlex Tomas 2512c9de560dSAlex Tomas err_freebuddy: 2513fb1813f4SCurt Wohlgemuth cachep = get_groupinfo_cache(sb->s_blocksize_bits); 2514f1fa3342SRoel Kluin while (i-- > 0) 2515fb1813f4SCurt Wohlgemuth kmem_cache_free(cachep, ext4_get_group_info(sb, i)); 251628623c2fSTheodore Ts'o i = sbi->s_group_info_size; 2517f1fa3342SRoel Kluin while (i-- > 0) 2518c9de560dSAlex Tomas kfree(sbi->s_group_info[i]); 2519c9de560dSAlex Tomas iput(sbi->s_buddy_cache); 2520c9de560dSAlex Tomas err_freesgi: 2521b93b41d4SAl Viro kvfree(sbi->s_group_info); 2522c9de560dSAlex Tomas return -ENOMEM; 2523c9de560dSAlex Tomas } 2524c9de560dSAlex Tomas 25252892c15dSEric Sandeen static void ext4_groupinfo_destroy_slabs(void) 25262892c15dSEric Sandeen { 25272892c15dSEric Sandeen int i; 25282892c15dSEric Sandeen 25292892c15dSEric Sandeen for (i = 0; i < NR_GRPINFO_CACHES; i++) { 25302892c15dSEric Sandeen if (ext4_groupinfo_caches[i]) 25312892c15dSEric Sandeen kmem_cache_destroy(ext4_groupinfo_caches[i]); 25322892c15dSEric Sandeen ext4_groupinfo_caches[i] = NULL; 25332892c15dSEric Sandeen } 25342892c15dSEric Sandeen } 25352892c15dSEric Sandeen 25362892c15dSEric Sandeen static int ext4_groupinfo_create_slab(size_t size) 25372892c15dSEric Sandeen { 25382892c15dSEric Sandeen static DEFINE_MUTEX(ext4_grpinfo_slab_create_mutex); 25392892c15dSEric Sandeen int slab_size; 25402892c15dSEric Sandeen int blocksize_bits = order_base_2(size); 25412892c15dSEric Sandeen int cache_index = blocksize_bits - EXT4_MIN_BLOCK_LOG_SIZE; 25422892c15dSEric Sandeen struct kmem_cache *cachep; 25432892c15dSEric Sandeen 25442892c15dSEric Sandeen if (cache_index >= NR_GRPINFO_CACHES) 25452892c15dSEric Sandeen return -EINVAL; 25462892c15dSEric Sandeen 25472892c15dSEric Sandeen if (unlikely(cache_index < 0)) 25482892c15dSEric Sandeen cache_index = 0; 25492892c15dSEric Sandeen 25502892c15dSEric Sandeen mutex_lock(&ext4_grpinfo_slab_create_mutex); 25512892c15dSEric Sandeen if (ext4_groupinfo_caches[cache_index]) { 25522892c15dSEric Sandeen mutex_unlock(&ext4_grpinfo_slab_create_mutex); 25532892c15dSEric Sandeen return 0; /* Already created */ 25542892c15dSEric Sandeen } 25552892c15dSEric Sandeen 25562892c15dSEric Sandeen slab_size = offsetof(struct ext4_group_info, 25572892c15dSEric Sandeen bb_counters[blocksize_bits + 2]); 25582892c15dSEric Sandeen 25592892c15dSEric Sandeen cachep = kmem_cache_create(ext4_groupinfo_slab_names[cache_index], 25602892c15dSEric Sandeen slab_size, 0, SLAB_RECLAIM_ACCOUNT, 25612892c15dSEric Sandeen NULL); 25622892c15dSEric Sandeen 2563823ba01fSTao Ma ext4_groupinfo_caches[cache_index] = cachep; 2564823ba01fSTao Ma 25652892c15dSEric Sandeen mutex_unlock(&ext4_grpinfo_slab_create_mutex); 25662892c15dSEric Sandeen if (!cachep) { 25679d8b9ec4STheodore Ts'o printk(KERN_EMERG 25689d8b9ec4STheodore Ts'o "EXT4-fs: no memory for groupinfo slab cache\n"); 25692892c15dSEric Sandeen return -ENOMEM; 25702892c15dSEric Sandeen } 25712892c15dSEric Sandeen 25722892c15dSEric Sandeen return 0; 25732892c15dSEric Sandeen } 25742892c15dSEric Sandeen 25759d99012fSAkira Fujita int ext4_mb_init(struct super_block *sb) 2576c9de560dSAlex Tomas { 2577c9de560dSAlex Tomas struct ext4_sb_info *sbi = EXT4_SB(sb); 25786be2ded1SAneesh Kumar K.V unsigned i, j; 2579c9de560dSAlex Tomas unsigned offset; 2580c9de560dSAlex Tomas unsigned max; 258174767c5aSShen Feng int ret; 2582c9de560dSAlex Tomas 25831927805eSEric Sandeen i = (sb->s_blocksize_bits + 2) * sizeof(*sbi->s_mb_offsets); 2584c9de560dSAlex Tomas 2585c9de560dSAlex Tomas sbi->s_mb_offsets = kmalloc(i, GFP_KERNEL); 2586c9de560dSAlex Tomas if (sbi->s_mb_offsets == NULL) { 2587fb1813f4SCurt Wohlgemuth ret = -ENOMEM; 2588fb1813f4SCurt Wohlgemuth goto out; 2589c9de560dSAlex Tomas } 2590ff7ef329SYasunori Goto 25911927805eSEric Sandeen i = (sb->s_blocksize_bits + 2) * sizeof(*sbi->s_mb_maxs); 2592c9de560dSAlex Tomas sbi->s_mb_maxs = kmalloc(i, GFP_KERNEL); 2593c9de560dSAlex Tomas if (sbi->s_mb_maxs == NULL) { 2594fb1813f4SCurt Wohlgemuth ret = -ENOMEM; 2595fb1813f4SCurt Wohlgemuth goto out; 2596fb1813f4SCurt Wohlgemuth } 2597fb1813f4SCurt Wohlgemuth 25982892c15dSEric Sandeen ret = ext4_groupinfo_create_slab(sb->s_blocksize); 25992892c15dSEric Sandeen if (ret < 0) 2600fb1813f4SCurt Wohlgemuth goto out; 2601c9de560dSAlex Tomas 2602c9de560dSAlex Tomas /* order 0 is regular bitmap */ 2603c9de560dSAlex Tomas sbi->s_mb_maxs[0] = sb->s_blocksize << 3; 2604c9de560dSAlex Tomas sbi->s_mb_offsets[0] = 0; 2605c9de560dSAlex Tomas 2606c9de560dSAlex Tomas i = 1; 2607c9de560dSAlex Tomas offset = 0; 2608c9de560dSAlex Tomas max = sb->s_blocksize << 2; 2609c9de560dSAlex Tomas do { 2610c9de560dSAlex Tomas sbi->s_mb_offsets[i] = offset; 2611c9de560dSAlex Tomas sbi->s_mb_maxs[i] = max; 2612c9de560dSAlex Tomas offset += 1 << (sb->s_blocksize_bits - i); 2613c9de560dSAlex Tomas max = max >> 1; 2614c9de560dSAlex Tomas i++; 2615c9de560dSAlex Tomas } while (i <= sb->s_blocksize_bits + 1); 2616c9de560dSAlex Tomas 2617c9de560dSAlex Tomas spin_lock_init(&sbi->s_md_lock); 2618c9de560dSAlex Tomas spin_lock_init(&sbi->s_bal_lock); 2619c9de560dSAlex Tomas 2620c9de560dSAlex Tomas sbi->s_mb_max_to_scan = MB_DEFAULT_MAX_TO_SCAN; 2621c9de560dSAlex Tomas sbi->s_mb_min_to_scan = MB_DEFAULT_MIN_TO_SCAN; 2622c9de560dSAlex Tomas sbi->s_mb_stats = MB_DEFAULT_STATS; 2623c9de560dSAlex Tomas sbi->s_mb_stream_request = MB_DEFAULT_STREAM_THRESHOLD; 2624c9de560dSAlex Tomas sbi->s_mb_order2_reqs = MB_DEFAULT_ORDER2_REQS; 262527baebb8STheodore Ts'o /* 262627baebb8STheodore Ts'o * The default group preallocation is 512, which for 4k block 262727baebb8STheodore Ts'o * sizes translates to 2 megabytes. However for bigalloc file 262827baebb8STheodore Ts'o * systems, this is probably too big (i.e, if the cluster size 262927baebb8STheodore Ts'o * is 1 megabyte, then group preallocation size becomes half a 263027baebb8STheodore Ts'o * gigabyte!). As a default, we will keep a two megabyte 263127baebb8STheodore Ts'o * group pralloc size for cluster sizes up to 64k, and after 263227baebb8STheodore Ts'o * that, we will force a minimum group preallocation size of 263327baebb8STheodore Ts'o * 32 clusters. This translates to 8 megs when the cluster 263427baebb8STheodore Ts'o * size is 256k, and 32 megs when the cluster size is 1 meg, 263527baebb8STheodore Ts'o * which seems reasonable as a default. 263627baebb8STheodore Ts'o */ 263727baebb8STheodore Ts'o sbi->s_mb_group_prealloc = max(MB_DEFAULT_GROUP_PREALLOC >> 263827baebb8STheodore Ts'o sbi->s_cluster_bits, 32); 2639d7a1fee1SDan Ehrenberg /* 2640d7a1fee1SDan Ehrenberg * If there is a s_stripe > 1, then we set the s_mb_group_prealloc 2641d7a1fee1SDan Ehrenberg * to the lowest multiple of s_stripe which is bigger than 2642d7a1fee1SDan Ehrenberg * the s_mb_group_prealloc as determined above. We want 2643d7a1fee1SDan Ehrenberg * the preallocation size to be an exact multiple of the 2644d7a1fee1SDan Ehrenberg * RAID stripe size so that preallocations don't fragment 2645d7a1fee1SDan Ehrenberg * the stripes. 2646d7a1fee1SDan Ehrenberg */ 2647d7a1fee1SDan Ehrenberg if (sbi->s_stripe > 1) { 2648d7a1fee1SDan Ehrenberg sbi->s_mb_group_prealloc = roundup( 2649d7a1fee1SDan Ehrenberg sbi->s_mb_group_prealloc, sbi->s_stripe); 2650d7a1fee1SDan Ehrenberg } 2651c9de560dSAlex Tomas 2652730c213cSEric Sandeen sbi->s_locality_groups = alloc_percpu(struct ext4_locality_group); 2653c9de560dSAlex Tomas if (sbi->s_locality_groups == NULL) { 2654fb1813f4SCurt Wohlgemuth ret = -ENOMEM; 2655029b10c5SAndrey Tsyvarev goto out; 2656c9de560dSAlex Tomas } 2657730c213cSEric Sandeen for_each_possible_cpu(i) { 2658c9de560dSAlex Tomas struct ext4_locality_group *lg; 2659730c213cSEric Sandeen lg = per_cpu_ptr(sbi->s_locality_groups, i); 2660c9de560dSAlex Tomas mutex_init(&lg->lg_mutex); 26616be2ded1SAneesh Kumar K.V for (j = 0; j < PREALLOC_TB_SIZE; j++) 26626be2ded1SAneesh Kumar K.V INIT_LIST_HEAD(&lg->lg_prealloc_list[j]); 2663c9de560dSAlex Tomas spin_lock_init(&lg->lg_prealloc_lock); 2664c9de560dSAlex Tomas } 2665c9de560dSAlex Tomas 266679a77c5aSYu Jian /* init file for buddy data */ 266779a77c5aSYu Jian ret = ext4_mb_init_backend(sb); 26687aa0baeaSTao Ma if (ret != 0) 26697aa0baeaSTao Ma goto out_free_locality_groups; 267079a77c5aSYu Jian 26717aa0baeaSTao Ma return 0; 26727aa0baeaSTao Ma 26737aa0baeaSTao Ma out_free_locality_groups: 26747aa0baeaSTao Ma free_percpu(sbi->s_locality_groups); 26757aa0baeaSTao Ma sbi->s_locality_groups = NULL; 2676fb1813f4SCurt Wohlgemuth out: 2677fb1813f4SCurt Wohlgemuth kfree(sbi->s_mb_offsets); 26787aa0baeaSTao Ma sbi->s_mb_offsets = NULL; 2679fb1813f4SCurt Wohlgemuth kfree(sbi->s_mb_maxs); 26807aa0baeaSTao Ma sbi->s_mb_maxs = NULL; 2681fb1813f4SCurt Wohlgemuth return ret; 2682c9de560dSAlex Tomas } 2683c9de560dSAlex Tomas 2684955ce5f5SAneesh Kumar K.V /* need to called with the ext4 group lock held */ 2685c9de560dSAlex Tomas static void ext4_mb_cleanup_pa(struct ext4_group_info *grp) 2686c9de560dSAlex Tomas { 2687c9de560dSAlex Tomas struct ext4_prealloc_space *pa; 2688c9de560dSAlex Tomas struct list_head *cur, *tmp; 2689c9de560dSAlex Tomas int count = 0; 2690c9de560dSAlex Tomas 2691c9de560dSAlex Tomas list_for_each_safe(cur, tmp, &grp->bb_prealloc_list) { 2692c9de560dSAlex Tomas pa = list_entry(cur, struct ext4_prealloc_space, pa_group_list); 2693c9de560dSAlex Tomas list_del(&pa->pa_group_list); 2694c9de560dSAlex Tomas count++; 2695688f05a0SAneesh Kumar K.V kmem_cache_free(ext4_pspace_cachep, pa); 2696c9de560dSAlex Tomas } 2697c9de560dSAlex Tomas if (count) 26986ba495e9STheodore Ts'o mb_debug(1, "mballoc: %u PAs left\n", count); 2699c9de560dSAlex Tomas 2700c9de560dSAlex Tomas } 2701c9de560dSAlex Tomas 2702c9de560dSAlex Tomas int ext4_mb_release(struct super_block *sb) 2703c9de560dSAlex Tomas { 27048df9675fSTheodore Ts'o ext4_group_t ngroups = ext4_get_groups_count(sb); 2705c9de560dSAlex Tomas ext4_group_t i; 2706c9de560dSAlex Tomas int num_meta_group_infos; 2707c9de560dSAlex Tomas struct ext4_group_info *grinfo; 2708c9de560dSAlex Tomas struct ext4_sb_info *sbi = EXT4_SB(sb); 2709fb1813f4SCurt Wohlgemuth struct kmem_cache *cachep = get_groupinfo_cache(sb->s_blocksize_bits); 2710c9de560dSAlex Tomas 2711c9de560dSAlex Tomas if (sbi->s_group_info) { 27128df9675fSTheodore Ts'o for (i = 0; i < ngroups; i++) { 2713c9de560dSAlex Tomas grinfo = ext4_get_group_info(sb, i); 2714c9de560dSAlex Tomas #ifdef DOUBLE_CHECK 2715c9de560dSAlex Tomas kfree(grinfo->bb_bitmap); 2716c9de560dSAlex Tomas #endif 2717c9de560dSAlex Tomas ext4_lock_group(sb, i); 2718c9de560dSAlex Tomas ext4_mb_cleanup_pa(grinfo); 2719c9de560dSAlex Tomas ext4_unlock_group(sb, i); 2720fb1813f4SCurt Wohlgemuth kmem_cache_free(cachep, grinfo); 2721c9de560dSAlex Tomas } 27228df9675fSTheodore Ts'o num_meta_group_infos = (ngroups + 2723c9de560dSAlex Tomas EXT4_DESC_PER_BLOCK(sb) - 1) >> 2724c9de560dSAlex Tomas EXT4_DESC_PER_BLOCK_BITS(sb); 2725c9de560dSAlex Tomas for (i = 0; i < num_meta_group_infos; i++) 2726c9de560dSAlex Tomas kfree(sbi->s_group_info[i]); 2727b93b41d4SAl Viro kvfree(sbi->s_group_info); 2728c9de560dSAlex Tomas } 2729c9de560dSAlex Tomas kfree(sbi->s_mb_offsets); 2730c9de560dSAlex Tomas kfree(sbi->s_mb_maxs); 2731c9de560dSAlex Tomas iput(sbi->s_buddy_cache); 2732c9de560dSAlex Tomas if (sbi->s_mb_stats) { 27339d8b9ec4STheodore Ts'o ext4_msg(sb, KERN_INFO, 27349d8b9ec4STheodore Ts'o "mballoc: %u blocks %u reqs (%u success)", 2735c9de560dSAlex Tomas atomic_read(&sbi->s_bal_allocated), 2736c9de560dSAlex Tomas atomic_read(&sbi->s_bal_reqs), 2737c9de560dSAlex Tomas atomic_read(&sbi->s_bal_success)); 27389d8b9ec4STheodore Ts'o ext4_msg(sb, KERN_INFO, 27399d8b9ec4STheodore Ts'o "mballoc: %u extents scanned, %u goal hits, " 27409d8b9ec4STheodore Ts'o "%u 2^N hits, %u breaks, %u lost", 2741c9de560dSAlex Tomas atomic_read(&sbi->s_bal_ex_scanned), 2742c9de560dSAlex Tomas atomic_read(&sbi->s_bal_goals), 2743c9de560dSAlex Tomas atomic_read(&sbi->s_bal_2orders), 2744c9de560dSAlex Tomas atomic_read(&sbi->s_bal_breaks), 2745c9de560dSAlex Tomas atomic_read(&sbi->s_mb_lost_chunks)); 27469d8b9ec4STheodore Ts'o ext4_msg(sb, KERN_INFO, 27479d8b9ec4STheodore Ts'o "mballoc: %lu generated and it took %Lu", 2748ced156e4STao Ma sbi->s_mb_buddies_generated, 2749c9de560dSAlex Tomas sbi->s_mb_generation_time); 27509d8b9ec4STheodore Ts'o ext4_msg(sb, KERN_INFO, 27519d8b9ec4STheodore Ts'o "mballoc: %u preallocated, %u discarded", 2752c9de560dSAlex Tomas atomic_read(&sbi->s_mb_preallocated), 2753c9de560dSAlex Tomas atomic_read(&sbi->s_mb_discarded)); 2754c9de560dSAlex Tomas } 2755c9de560dSAlex Tomas 2756730c213cSEric Sandeen free_percpu(sbi->s_locality_groups); 2757c9de560dSAlex Tomas 2758c9de560dSAlex Tomas return 0; 2759c9de560dSAlex Tomas } 2760c9de560dSAlex Tomas 276177ca6cdfSLukas Czerner static inline int ext4_issue_discard(struct super_block *sb, 276284130193STheodore Ts'o ext4_group_t block_group, ext4_grpblk_t cluster, int count) 27635c521830SJiaying Zhang { 27645c521830SJiaying Zhang ext4_fsblk_t discard_block; 27655c521830SJiaying Zhang 276684130193STheodore Ts'o discard_block = (EXT4_C2B(EXT4_SB(sb), cluster) + 276784130193STheodore Ts'o ext4_group_first_block_no(sb, block_group)); 276884130193STheodore Ts'o count = EXT4_C2B(EXT4_SB(sb), count); 27695c521830SJiaying Zhang trace_ext4_discard_blocks(sb, 27705c521830SJiaying Zhang (unsigned long long) discard_block, count); 277193259636SLukas Czerner return sb_issue_discard(sb, discard_block, count, GFP_NOFS, 0); 27725c521830SJiaying Zhang } 27735c521830SJiaying Zhang 27743e624fc7STheodore Ts'o /* 27753e624fc7STheodore Ts'o * This function is called by the jbd2 layer once the commit has finished, 27763e624fc7STheodore Ts'o * so we know we can free the blocks that were released with that commit. 27773e624fc7STheodore Ts'o */ 277818aadd47SBobi Jam static void ext4_free_data_callback(struct super_block *sb, 277918aadd47SBobi Jam struct ext4_journal_cb_entry *jce, 278018aadd47SBobi Jam int rc) 2781c9de560dSAlex Tomas { 278218aadd47SBobi Jam struct ext4_free_data *entry = (struct ext4_free_data *)jce; 2783c9de560dSAlex Tomas struct ext4_buddy e4b; 2784c894058dSAneesh Kumar K.V struct ext4_group_info *db; 2785d9f34504STheodore Ts'o int err, count = 0, count2 = 0; 2786c9de560dSAlex Tomas 27876ba495e9STheodore Ts'o mb_debug(1, "gonna free %u blocks in group %u (0x%p):", 278818aadd47SBobi Jam entry->efd_count, entry->efd_group, entry); 2789c9de560dSAlex Tomas 2790d71c1ae2SLukas Czerner if (test_opt(sb, DISCARD)) { 2791d71c1ae2SLukas Czerner err = ext4_issue_discard(sb, entry->efd_group, 2792d71c1ae2SLukas Czerner entry->efd_start_cluster, 2793d71c1ae2SLukas Czerner entry->efd_count); 2794d71c1ae2SLukas Czerner if (err && err != -EOPNOTSUPP) 2795d71c1ae2SLukas Czerner ext4_msg(sb, KERN_WARNING, "discard request in" 2796d71c1ae2SLukas Czerner " group:%d block:%d count:%d failed" 2797d71c1ae2SLukas Czerner " with %d", entry->efd_group, 2798d71c1ae2SLukas Czerner entry->efd_start_cluster, 2799d71c1ae2SLukas Czerner entry->efd_count, err); 2800d71c1ae2SLukas Czerner } 2801b90f6870STheodore Ts'o 280218aadd47SBobi Jam err = ext4_mb_load_buddy(sb, entry->efd_group, &e4b); 2803c9de560dSAlex Tomas /* we expect to find existing buddy because it's pinned */ 2804c9de560dSAlex Tomas BUG_ON(err != 0); 2805c9de560dSAlex Tomas 280618aadd47SBobi Jam 2807c894058dSAneesh Kumar K.V db = e4b.bd_info; 2808c9de560dSAlex Tomas /* there are blocks to put in buddy to make them really free */ 280918aadd47SBobi Jam count += entry->efd_count; 2810c9de560dSAlex Tomas count2++; 281118aadd47SBobi Jam ext4_lock_group(sb, entry->efd_group); 2812c894058dSAneesh Kumar K.V /* Take it out of per group rb tree */ 281318aadd47SBobi Jam rb_erase(&entry->efd_node, &(db->bb_free_root)); 281418aadd47SBobi Jam mb_free_blocks(NULL, &e4b, entry->efd_start_cluster, entry->efd_count); 2815c9de560dSAlex Tomas 28163d56b8d2STao Ma /* 28173d56b8d2STao Ma * Clear the trimmed flag for the group so that the next 28183d56b8d2STao Ma * ext4_trim_fs can trim it. 28193d56b8d2STao Ma * If the volume is mounted with -o discard, online discard 28203d56b8d2STao Ma * is supported and the free blocks will be trimmed online. 28213d56b8d2STao Ma */ 28223d56b8d2STao Ma if (!test_opt(sb, DISCARD)) 28233d56b8d2STao Ma EXT4_MB_GRP_CLEAR_TRIMMED(db); 28243d56b8d2STao Ma 2825c894058dSAneesh Kumar K.V if (!db->bb_free_root.rb_node) { 2826c894058dSAneesh Kumar K.V /* No more items in the per group rb tree 2827c894058dSAneesh Kumar K.V * balance refcounts from ext4_mb_free_metadata() 2828c894058dSAneesh Kumar K.V */ 2829c9de560dSAlex Tomas page_cache_release(e4b.bd_buddy_page); 2830c9de560dSAlex Tomas page_cache_release(e4b.bd_bitmap_page); 2831c894058dSAneesh Kumar K.V } 283218aadd47SBobi Jam ext4_unlock_group(sb, entry->efd_group); 283318aadd47SBobi Jam kmem_cache_free(ext4_free_data_cachep, entry); 2834e39e07fdSJing Zhang ext4_mb_unload_buddy(&e4b); 2835c9de560dSAlex Tomas 28366ba495e9STheodore Ts'o mb_debug(1, "freed %u blocks in %u structures\n", count, count2); 2837c9de560dSAlex Tomas } 2838c9de560dSAlex Tomas 28395dabfc78STheodore Ts'o int __init ext4_init_mballoc(void) 2840c9de560dSAlex Tomas { 284116828088STheodore Ts'o ext4_pspace_cachep = KMEM_CACHE(ext4_prealloc_space, 284216828088STheodore Ts'o SLAB_RECLAIM_ACCOUNT); 2843c9de560dSAlex Tomas if (ext4_pspace_cachep == NULL) 2844c9de560dSAlex Tomas return -ENOMEM; 2845c9de560dSAlex Tomas 284616828088STheodore Ts'o ext4_ac_cachep = KMEM_CACHE(ext4_allocation_context, 284716828088STheodore Ts'o SLAB_RECLAIM_ACCOUNT); 2848256bdb49SEric Sandeen if (ext4_ac_cachep == NULL) { 2849256bdb49SEric Sandeen kmem_cache_destroy(ext4_pspace_cachep); 2850256bdb49SEric Sandeen return -ENOMEM; 2851256bdb49SEric Sandeen } 2852c894058dSAneesh Kumar K.V 285318aadd47SBobi Jam ext4_free_data_cachep = KMEM_CACHE(ext4_free_data, 285416828088STheodore Ts'o SLAB_RECLAIM_ACCOUNT); 285518aadd47SBobi Jam if (ext4_free_data_cachep == NULL) { 2856c894058dSAneesh Kumar K.V kmem_cache_destroy(ext4_pspace_cachep); 2857c894058dSAneesh Kumar K.V kmem_cache_destroy(ext4_ac_cachep); 2858c894058dSAneesh Kumar K.V return -ENOMEM; 2859c894058dSAneesh Kumar K.V } 2860c9de560dSAlex Tomas return 0; 2861c9de560dSAlex Tomas } 2862c9de560dSAlex Tomas 28635dabfc78STheodore Ts'o void ext4_exit_mballoc(void) 2864c9de560dSAlex Tomas { 28653e03f9caSJesper Dangaard Brouer /* 28663e03f9caSJesper Dangaard Brouer * Wait for completion of call_rcu()'s on ext4_pspace_cachep 28673e03f9caSJesper Dangaard Brouer * before destroying the slab cache. 28683e03f9caSJesper Dangaard Brouer */ 28693e03f9caSJesper Dangaard Brouer rcu_barrier(); 2870c9de560dSAlex Tomas kmem_cache_destroy(ext4_pspace_cachep); 2871256bdb49SEric Sandeen kmem_cache_destroy(ext4_ac_cachep); 287218aadd47SBobi Jam kmem_cache_destroy(ext4_free_data_cachep); 28732892c15dSEric Sandeen ext4_groupinfo_destroy_slabs(); 2874c9de560dSAlex Tomas } 2875c9de560dSAlex Tomas 2876c9de560dSAlex Tomas 2877c9de560dSAlex Tomas /* 287873b2c716SUwe Kleine-König * Check quota and mark chosen space (ac->ac_b_ex) non-free in bitmaps 2879c9de560dSAlex Tomas * Returns 0 if success or error code 2880c9de560dSAlex Tomas */ 28814ddfef7bSEric Sandeen static noinline_for_stack int 28824ddfef7bSEric Sandeen ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac, 288353accfa9STheodore Ts'o handle_t *handle, unsigned int reserv_clstrs) 2884c9de560dSAlex Tomas { 2885c9de560dSAlex Tomas struct buffer_head *bitmap_bh = NULL; 2886c9de560dSAlex Tomas struct ext4_group_desc *gdp; 2887c9de560dSAlex Tomas struct buffer_head *gdp_bh; 2888c9de560dSAlex Tomas struct ext4_sb_info *sbi; 2889c9de560dSAlex Tomas struct super_block *sb; 2890c9de560dSAlex Tomas ext4_fsblk_t block; 2891519deca0SAneesh Kumar K.V int err, len; 2892c9de560dSAlex Tomas 2893c9de560dSAlex Tomas BUG_ON(ac->ac_status != AC_STATUS_FOUND); 2894c9de560dSAlex Tomas BUG_ON(ac->ac_b_ex.fe_len <= 0); 2895c9de560dSAlex Tomas 2896c9de560dSAlex Tomas sb = ac->ac_sb; 2897c9de560dSAlex Tomas sbi = EXT4_SB(sb); 2898c9de560dSAlex Tomas 2899574ca174STheodore Ts'o bitmap_bh = ext4_read_block_bitmap(sb, ac->ac_b_ex.fe_group); 29009008a58eSDarrick J. Wong if (IS_ERR(bitmap_bh)) { 29019008a58eSDarrick J. Wong err = PTR_ERR(bitmap_bh); 29029008a58eSDarrick J. Wong bitmap_bh = NULL; 2903c9de560dSAlex Tomas goto out_err; 29049008a58eSDarrick J. Wong } 2905c9de560dSAlex Tomas 29065d601255Sliang xie BUFFER_TRACE(bitmap_bh, "getting write access"); 2907c9de560dSAlex Tomas err = ext4_journal_get_write_access(handle, bitmap_bh); 2908c9de560dSAlex Tomas if (err) 2909c9de560dSAlex Tomas goto out_err; 2910c9de560dSAlex Tomas 2911c9de560dSAlex Tomas err = -EIO; 2912c9de560dSAlex Tomas gdp = ext4_get_group_desc(sb, ac->ac_b_ex.fe_group, &gdp_bh); 2913c9de560dSAlex Tomas if (!gdp) 2914c9de560dSAlex Tomas goto out_err; 2915c9de560dSAlex Tomas 2916a9df9a49STheodore Ts'o ext4_debug("using block group %u(%d)\n", ac->ac_b_ex.fe_group, 2917021b65bbSTheodore Ts'o ext4_free_group_clusters(sb, gdp)); 291803cddb80SAneesh Kumar K.V 29195d601255Sliang xie BUFFER_TRACE(gdp_bh, "get_write_access"); 2920c9de560dSAlex Tomas err = ext4_journal_get_write_access(handle, gdp_bh); 2921c9de560dSAlex Tomas if (err) 2922c9de560dSAlex Tomas goto out_err; 2923c9de560dSAlex Tomas 2924bda00de7SAkinobu Mita block = ext4_grp_offs_to_block(sb, &ac->ac_b_ex); 2925c9de560dSAlex Tomas 292653accfa9STheodore Ts'o len = EXT4_C2B(sbi, ac->ac_b_ex.fe_len); 29276fd058f7STheodore Ts'o if (!ext4_data_block_valid(sbi, block, len)) { 292812062dddSEric Sandeen ext4_error(sb, "Allocating blocks %llu-%llu which overlap " 29291084f252STheodore Ts'o "fs metadata", block, block+len); 2930519deca0SAneesh Kumar K.V /* File system mounted not to panic on error 2931519deca0SAneesh Kumar K.V * Fix the bitmap and repeat the block allocation 2932519deca0SAneesh Kumar K.V * We leak some of the blocks here. 2933519deca0SAneesh Kumar K.V */ 2934955ce5f5SAneesh Kumar K.V ext4_lock_group(sb, ac->ac_b_ex.fe_group); 2935c3e94d1dSYongqiang Yang ext4_set_bits(bitmap_bh->b_data, ac->ac_b_ex.fe_start, 2936519deca0SAneesh Kumar K.V ac->ac_b_ex.fe_len); 2937955ce5f5SAneesh Kumar K.V ext4_unlock_group(sb, ac->ac_b_ex.fe_group); 29380390131bSFrank Mayhar err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); 2939519deca0SAneesh Kumar K.V if (!err) 2940519deca0SAneesh Kumar K.V err = -EAGAIN; 2941519deca0SAneesh Kumar K.V goto out_err; 2942c9de560dSAlex Tomas } 2943955ce5f5SAneesh Kumar K.V 2944955ce5f5SAneesh Kumar K.V ext4_lock_group(sb, ac->ac_b_ex.fe_group); 2945c9de560dSAlex Tomas #ifdef AGGRESSIVE_CHECK 2946c9de560dSAlex Tomas { 2947c9de560dSAlex Tomas int i; 2948c9de560dSAlex Tomas for (i = 0; i < ac->ac_b_ex.fe_len; i++) { 2949c9de560dSAlex Tomas BUG_ON(mb_test_bit(ac->ac_b_ex.fe_start + i, 2950c9de560dSAlex Tomas bitmap_bh->b_data)); 2951c9de560dSAlex Tomas } 2952c9de560dSAlex Tomas } 2953c9de560dSAlex Tomas #endif 2954c3e94d1dSYongqiang Yang ext4_set_bits(bitmap_bh->b_data, ac->ac_b_ex.fe_start, 2955c3e94d1dSYongqiang Yang ac->ac_b_ex.fe_len); 2956c9de560dSAlex Tomas if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { 2957c9de560dSAlex Tomas gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT); 2958021b65bbSTheodore Ts'o ext4_free_group_clusters_set(sb, gdp, 2959cff1dfd7STheodore Ts'o ext4_free_clusters_after_init(sb, 2960560671a0SAneesh Kumar K.V ac->ac_b_ex.fe_group, gdp)); 2961c9de560dSAlex Tomas } 2962021b65bbSTheodore Ts'o len = ext4_free_group_clusters(sb, gdp) - ac->ac_b_ex.fe_len; 2963021b65bbSTheodore Ts'o ext4_free_group_clusters_set(sb, gdp, len); 296479f1ba49STao Ma ext4_block_bitmap_csum_set(sb, ac->ac_b_ex.fe_group, gdp, bitmap_bh); 2965feb0ab32SDarrick J. Wong ext4_group_desc_csum_set(sb, ac->ac_b_ex.fe_group, gdp); 2966955ce5f5SAneesh Kumar K.V 2967955ce5f5SAneesh Kumar K.V ext4_unlock_group(sb, ac->ac_b_ex.fe_group); 296857042651STheodore Ts'o percpu_counter_sub(&sbi->s_freeclusters_counter, ac->ac_b_ex.fe_len); 2969d2a17637SMingming Cao /* 29706bc6e63fSAneesh Kumar K.V * Now reduce the dirty block count also. Should not go negative 2971d2a17637SMingming Cao */ 29726bc6e63fSAneesh Kumar K.V if (!(ac->ac_flags & EXT4_MB_DELALLOC_RESERVED)) 29736bc6e63fSAneesh Kumar K.V /* release all the reserved blocks if non delalloc */ 297457042651STheodore Ts'o percpu_counter_sub(&sbi->s_dirtyclusters_counter, 297557042651STheodore Ts'o reserv_clstrs); 2976c9de560dSAlex Tomas 2977772cb7c8SJose R. Santos if (sbi->s_log_groups_per_flex) { 2978772cb7c8SJose R. Santos ext4_group_t flex_group = ext4_flex_group(sbi, 2979772cb7c8SJose R. Santos ac->ac_b_ex.fe_group); 298090ba983fSTheodore Ts'o atomic64_sub(ac->ac_b_ex.fe_len, 298124aaa8efSTheodore Ts'o &sbi->s_flex_groups[flex_group].free_clusters); 2982772cb7c8SJose R. Santos } 2983772cb7c8SJose R. Santos 29840390131bSFrank Mayhar err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); 2985c9de560dSAlex Tomas if (err) 2986c9de560dSAlex Tomas goto out_err; 29870390131bSFrank Mayhar err = ext4_handle_dirty_metadata(handle, NULL, gdp_bh); 2988c9de560dSAlex Tomas 2989c9de560dSAlex Tomas out_err: 299042a10addSAneesh Kumar K.V brelse(bitmap_bh); 2991c9de560dSAlex Tomas return err; 2992c9de560dSAlex Tomas } 2993c9de560dSAlex Tomas 2994c9de560dSAlex Tomas /* 2995c9de560dSAlex Tomas * here we normalize request for locality group 2996d7a1fee1SDan Ehrenberg * Group request are normalized to s_mb_group_prealloc, which goes to 2997d7a1fee1SDan Ehrenberg * s_strip if we set the same via mount option. 2998d7a1fee1SDan Ehrenberg * s_mb_group_prealloc can be configured via 2999b713a5ecSTheodore Ts'o * /sys/fs/ext4/<partition>/mb_group_prealloc 3000c9de560dSAlex Tomas * 3001c9de560dSAlex Tomas * XXX: should we try to preallocate more than the group has now? 3002c9de560dSAlex Tomas */ 3003c9de560dSAlex Tomas static void ext4_mb_normalize_group_request(struct ext4_allocation_context *ac) 3004c9de560dSAlex Tomas { 3005c9de560dSAlex Tomas struct super_block *sb = ac->ac_sb; 3006c9de560dSAlex Tomas struct ext4_locality_group *lg = ac->ac_lg; 3007c9de560dSAlex Tomas 3008c9de560dSAlex Tomas BUG_ON(lg == NULL); 3009c9de560dSAlex Tomas ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc; 30106ba495e9STheodore Ts'o mb_debug(1, "#%u: goal %u blocks for locality group\n", 3011c9de560dSAlex Tomas current->pid, ac->ac_g_ex.fe_len); 3012c9de560dSAlex Tomas } 3013c9de560dSAlex Tomas 3014c9de560dSAlex Tomas /* 3015c9de560dSAlex Tomas * Normalization means making request better in terms of 3016c9de560dSAlex Tomas * size and alignment 3017c9de560dSAlex Tomas */ 30184ddfef7bSEric Sandeen static noinline_for_stack void 30194ddfef7bSEric Sandeen ext4_mb_normalize_request(struct ext4_allocation_context *ac, 3020c9de560dSAlex Tomas struct ext4_allocation_request *ar) 3021c9de560dSAlex Tomas { 302253accfa9STheodore Ts'o struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); 3023c9de560dSAlex Tomas int bsbits, max; 3024c9de560dSAlex Tomas ext4_lblk_t end; 30251592d2c5SCurt Wohlgemuth loff_t size, start_off; 30261592d2c5SCurt Wohlgemuth loff_t orig_size __maybe_unused; 30275a0790c2SAndi Kleen ext4_lblk_t start; 3028c9de560dSAlex Tomas struct ext4_inode_info *ei = EXT4_I(ac->ac_inode); 30299a0762c5SAneesh Kumar K.V struct ext4_prealloc_space *pa; 3030c9de560dSAlex Tomas 3031c9de560dSAlex Tomas /* do normalize only data requests, metadata requests 3032c9de560dSAlex Tomas do not need preallocation */ 3033c9de560dSAlex Tomas if (!(ac->ac_flags & EXT4_MB_HINT_DATA)) 3034c9de560dSAlex Tomas return; 3035c9de560dSAlex Tomas 3036c9de560dSAlex Tomas /* sometime caller may want exact blocks */ 3037c9de560dSAlex Tomas if (unlikely(ac->ac_flags & EXT4_MB_HINT_GOAL_ONLY)) 3038c9de560dSAlex Tomas return; 3039c9de560dSAlex Tomas 3040c9de560dSAlex Tomas /* caller may indicate that preallocation isn't 3041c9de560dSAlex Tomas * required (it's a tail, for example) */ 3042c9de560dSAlex Tomas if (ac->ac_flags & EXT4_MB_HINT_NOPREALLOC) 3043c9de560dSAlex Tomas return; 3044c9de560dSAlex Tomas 3045c9de560dSAlex Tomas if (ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC) { 3046c9de560dSAlex Tomas ext4_mb_normalize_group_request(ac); 3047c9de560dSAlex Tomas return ; 3048c9de560dSAlex Tomas } 3049c9de560dSAlex Tomas 3050c9de560dSAlex Tomas bsbits = ac->ac_sb->s_blocksize_bits; 3051c9de560dSAlex Tomas 3052c9de560dSAlex Tomas /* first, let's learn actual file size 3053c9de560dSAlex Tomas * given current request is allocated */ 305453accfa9STheodore Ts'o size = ac->ac_o_ex.fe_logical + EXT4_C2B(sbi, ac->ac_o_ex.fe_len); 3055c9de560dSAlex Tomas size = size << bsbits; 3056c9de560dSAlex Tomas if (size < i_size_read(ac->ac_inode)) 3057c9de560dSAlex Tomas size = i_size_read(ac->ac_inode); 30585a0790c2SAndi Kleen orig_size = size; 3059c9de560dSAlex Tomas 30601930479cSValerie Clement /* max size of free chunks */ 30611930479cSValerie Clement max = 2 << bsbits; 3062c9de560dSAlex Tomas 30631930479cSValerie Clement #define NRL_CHECK_SIZE(req, size, max, chunk_size) \ 30641930479cSValerie Clement (req <= (size) || max <= (chunk_size)) 3065c9de560dSAlex Tomas 3066c9de560dSAlex Tomas /* first, try to predict filesize */ 3067c9de560dSAlex Tomas /* XXX: should this table be tunable? */ 3068c9de560dSAlex Tomas start_off = 0; 3069c9de560dSAlex Tomas if (size <= 16 * 1024) { 3070c9de560dSAlex Tomas size = 16 * 1024; 3071c9de560dSAlex Tomas } else if (size <= 32 * 1024) { 3072c9de560dSAlex Tomas size = 32 * 1024; 3073c9de560dSAlex Tomas } else if (size <= 64 * 1024) { 3074c9de560dSAlex Tomas size = 64 * 1024; 3075c9de560dSAlex Tomas } else if (size <= 128 * 1024) { 3076c9de560dSAlex Tomas size = 128 * 1024; 3077c9de560dSAlex Tomas } else if (size <= 256 * 1024) { 3078c9de560dSAlex Tomas size = 256 * 1024; 3079c9de560dSAlex Tomas } else if (size <= 512 * 1024) { 3080c9de560dSAlex Tomas size = 512 * 1024; 3081c9de560dSAlex Tomas } else if (size <= 1024 * 1024) { 3082c9de560dSAlex Tomas size = 1024 * 1024; 30831930479cSValerie Clement } else if (NRL_CHECK_SIZE(size, 4 * 1024 * 1024, max, 2 * 1024)) { 3084c9de560dSAlex Tomas start_off = ((loff_t)ac->ac_o_ex.fe_logical >> 30851930479cSValerie Clement (21 - bsbits)) << 21; 30861930479cSValerie Clement size = 2 * 1024 * 1024; 30871930479cSValerie Clement } else if (NRL_CHECK_SIZE(size, 8 * 1024 * 1024, max, 4 * 1024)) { 3088c9de560dSAlex Tomas start_off = ((loff_t)ac->ac_o_ex.fe_logical >> 3089c9de560dSAlex Tomas (22 - bsbits)) << 22; 3090c9de560dSAlex Tomas size = 4 * 1024 * 1024; 3091c9de560dSAlex Tomas } else if (NRL_CHECK_SIZE(ac->ac_o_ex.fe_len, 30921930479cSValerie Clement (8<<20)>>bsbits, max, 8 * 1024)) { 3093c9de560dSAlex Tomas start_off = ((loff_t)ac->ac_o_ex.fe_logical >> 3094c9de560dSAlex Tomas (23 - bsbits)) << 23; 3095c9de560dSAlex Tomas size = 8 * 1024 * 1024; 3096c9de560dSAlex Tomas } else { 3097c9de560dSAlex Tomas start_off = (loff_t) ac->ac_o_ex.fe_logical << bsbits; 3098b27b1535SXiaoguang Wang size = (loff_t) EXT4_C2B(EXT4_SB(ac->ac_sb), 3099b27b1535SXiaoguang Wang ac->ac_o_ex.fe_len) << bsbits; 3100c9de560dSAlex Tomas } 31015a0790c2SAndi Kleen size = size >> bsbits; 31025a0790c2SAndi Kleen start = start_off >> bsbits; 3103c9de560dSAlex Tomas 3104c9de560dSAlex Tomas /* don't cover already allocated blocks in selected range */ 3105c9de560dSAlex Tomas if (ar->pleft && start <= ar->lleft) { 3106c9de560dSAlex Tomas size -= ar->lleft + 1 - start; 3107c9de560dSAlex Tomas start = ar->lleft + 1; 3108c9de560dSAlex Tomas } 3109c9de560dSAlex Tomas if (ar->pright && start + size - 1 >= ar->lright) 3110c9de560dSAlex Tomas size -= start + size - ar->lright; 3111c9de560dSAlex Tomas 3112c9de560dSAlex Tomas end = start + size; 3113c9de560dSAlex Tomas 3114c9de560dSAlex Tomas /* check we don't cross already preallocated blocks */ 3115c9de560dSAlex Tomas rcu_read_lock(); 31169a0762c5SAneesh Kumar K.V list_for_each_entry_rcu(pa, &ei->i_prealloc_list, pa_inode_list) { 3117498e5f24STheodore Ts'o ext4_lblk_t pa_end; 3118c9de560dSAlex Tomas 3119c9de560dSAlex Tomas if (pa->pa_deleted) 3120c9de560dSAlex Tomas continue; 3121c9de560dSAlex Tomas spin_lock(&pa->pa_lock); 3122c9de560dSAlex Tomas if (pa->pa_deleted) { 3123c9de560dSAlex Tomas spin_unlock(&pa->pa_lock); 3124c9de560dSAlex Tomas continue; 3125c9de560dSAlex Tomas } 3126c9de560dSAlex Tomas 312753accfa9STheodore Ts'o pa_end = pa->pa_lstart + EXT4_C2B(EXT4_SB(ac->ac_sb), 312853accfa9STheodore Ts'o pa->pa_len); 3129c9de560dSAlex Tomas 3130c9de560dSAlex Tomas /* PA must not overlap original request */ 3131c9de560dSAlex Tomas BUG_ON(!(ac->ac_o_ex.fe_logical >= pa_end || 3132c9de560dSAlex Tomas ac->ac_o_ex.fe_logical < pa->pa_lstart)); 3133c9de560dSAlex Tomas 313438877f4eSEric Sandeen /* skip PAs this normalized request doesn't overlap with */ 313538877f4eSEric Sandeen if (pa->pa_lstart >= end || pa_end <= start) { 3136c9de560dSAlex Tomas spin_unlock(&pa->pa_lock); 3137c9de560dSAlex Tomas continue; 3138c9de560dSAlex Tomas } 3139c9de560dSAlex Tomas BUG_ON(pa->pa_lstart <= start && pa_end >= end); 3140c9de560dSAlex Tomas 314138877f4eSEric Sandeen /* adjust start or end to be adjacent to this pa */ 3142c9de560dSAlex Tomas if (pa_end <= ac->ac_o_ex.fe_logical) { 3143c9de560dSAlex Tomas BUG_ON(pa_end < start); 3144c9de560dSAlex Tomas start = pa_end; 314538877f4eSEric Sandeen } else if (pa->pa_lstart > ac->ac_o_ex.fe_logical) { 3146c9de560dSAlex Tomas BUG_ON(pa->pa_lstart > end); 3147c9de560dSAlex Tomas end = pa->pa_lstart; 3148c9de560dSAlex Tomas } 3149c9de560dSAlex Tomas spin_unlock(&pa->pa_lock); 3150c9de560dSAlex Tomas } 3151c9de560dSAlex Tomas rcu_read_unlock(); 3152c9de560dSAlex Tomas size = end - start; 3153c9de560dSAlex Tomas 3154c9de560dSAlex Tomas /* XXX: extra loop to check we really don't overlap preallocations */ 3155c9de560dSAlex Tomas rcu_read_lock(); 31569a0762c5SAneesh Kumar K.V list_for_each_entry_rcu(pa, &ei->i_prealloc_list, pa_inode_list) { 3157498e5f24STheodore Ts'o ext4_lblk_t pa_end; 315853accfa9STheodore Ts'o 3159c9de560dSAlex Tomas spin_lock(&pa->pa_lock); 3160c9de560dSAlex Tomas if (pa->pa_deleted == 0) { 316153accfa9STheodore Ts'o pa_end = pa->pa_lstart + EXT4_C2B(EXT4_SB(ac->ac_sb), 316253accfa9STheodore Ts'o pa->pa_len); 3163c9de560dSAlex Tomas BUG_ON(!(start >= pa_end || end <= pa->pa_lstart)); 3164c9de560dSAlex Tomas } 3165c9de560dSAlex Tomas spin_unlock(&pa->pa_lock); 3166c9de560dSAlex Tomas } 3167c9de560dSAlex Tomas rcu_read_unlock(); 3168c9de560dSAlex Tomas 3169c9de560dSAlex Tomas if (start + size <= ac->ac_o_ex.fe_logical && 3170c9de560dSAlex Tomas start > ac->ac_o_ex.fe_logical) { 31719d8b9ec4STheodore Ts'o ext4_msg(ac->ac_sb, KERN_ERR, 31729d8b9ec4STheodore Ts'o "start %lu, size %lu, fe_logical %lu", 3173c9de560dSAlex Tomas (unsigned long) start, (unsigned long) size, 3174c9de560dSAlex Tomas (unsigned long) ac->ac_o_ex.fe_logical); 3175dfe076c1SDmitry Monakhov BUG(); 3176c9de560dSAlex Tomas } 3177b5b60778SMaurizio Lombardi BUG_ON(size <= 0 || size > EXT4_BLOCKS_PER_GROUP(ac->ac_sb)); 3178c9de560dSAlex Tomas 3179c9de560dSAlex Tomas /* now prepare goal request */ 3180c9de560dSAlex Tomas 3181c9de560dSAlex Tomas /* XXX: is it better to align blocks WRT to logical 3182c9de560dSAlex Tomas * placement or satisfy big request as is */ 3183c9de560dSAlex Tomas ac->ac_g_ex.fe_logical = start; 318453accfa9STheodore Ts'o ac->ac_g_ex.fe_len = EXT4_NUM_B2C(sbi, size); 3185c9de560dSAlex Tomas 3186c9de560dSAlex Tomas /* define goal start in order to merge */ 3187c9de560dSAlex Tomas if (ar->pright && (ar->lright == (start + size))) { 3188c9de560dSAlex Tomas /* merge to the right */ 3189c9de560dSAlex Tomas ext4_get_group_no_and_offset(ac->ac_sb, ar->pright - size, 3190c9de560dSAlex Tomas &ac->ac_f_ex.fe_group, 3191c9de560dSAlex Tomas &ac->ac_f_ex.fe_start); 3192c9de560dSAlex Tomas ac->ac_flags |= EXT4_MB_HINT_TRY_GOAL; 3193c9de560dSAlex Tomas } 3194c9de560dSAlex Tomas if (ar->pleft && (ar->lleft + 1 == start)) { 3195c9de560dSAlex Tomas /* merge to the left */ 3196c9de560dSAlex Tomas ext4_get_group_no_and_offset(ac->ac_sb, ar->pleft + 1, 3197c9de560dSAlex Tomas &ac->ac_f_ex.fe_group, 3198c9de560dSAlex Tomas &ac->ac_f_ex.fe_start); 3199c9de560dSAlex Tomas ac->ac_flags |= EXT4_MB_HINT_TRY_GOAL; 3200c9de560dSAlex Tomas } 3201c9de560dSAlex Tomas 32026ba495e9STheodore Ts'o mb_debug(1, "goal: %u(was %u) blocks at %u\n", (unsigned) size, 3203c9de560dSAlex Tomas (unsigned) orig_size, (unsigned) start); 3204c9de560dSAlex Tomas } 3205c9de560dSAlex Tomas 3206c9de560dSAlex Tomas static void ext4_mb_collect_stats(struct ext4_allocation_context *ac) 3207c9de560dSAlex Tomas { 3208c9de560dSAlex Tomas struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); 3209c9de560dSAlex Tomas 3210c9de560dSAlex Tomas if (sbi->s_mb_stats && ac->ac_g_ex.fe_len > 1) { 3211c9de560dSAlex Tomas atomic_inc(&sbi->s_bal_reqs); 3212c9de560dSAlex Tomas atomic_add(ac->ac_b_ex.fe_len, &sbi->s_bal_allocated); 3213291dae47SCurt Wohlgemuth if (ac->ac_b_ex.fe_len >= ac->ac_o_ex.fe_len) 3214c9de560dSAlex Tomas atomic_inc(&sbi->s_bal_success); 3215c9de560dSAlex Tomas atomic_add(ac->ac_found, &sbi->s_bal_ex_scanned); 3216c9de560dSAlex Tomas if (ac->ac_g_ex.fe_start == ac->ac_b_ex.fe_start && 3217c9de560dSAlex Tomas ac->ac_g_ex.fe_group == ac->ac_b_ex.fe_group) 3218c9de560dSAlex Tomas atomic_inc(&sbi->s_bal_goals); 3219c9de560dSAlex Tomas if (ac->ac_found > sbi->s_mb_max_to_scan) 3220c9de560dSAlex Tomas atomic_inc(&sbi->s_bal_breaks); 3221c9de560dSAlex Tomas } 3222c9de560dSAlex Tomas 3223296c355cSTheodore Ts'o if (ac->ac_op == EXT4_MB_HISTORY_ALLOC) 3224296c355cSTheodore Ts'o trace_ext4_mballoc_alloc(ac); 3225296c355cSTheodore Ts'o else 3226296c355cSTheodore Ts'o trace_ext4_mballoc_prealloc(ac); 3227c9de560dSAlex Tomas } 3228c9de560dSAlex Tomas 3229c9de560dSAlex Tomas /* 3230b844167eSCurt Wohlgemuth * Called on failure; free up any blocks from the inode PA for this 3231b844167eSCurt Wohlgemuth * context. We don't need this for MB_GROUP_PA because we only change 3232b844167eSCurt Wohlgemuth * pa_free in ext4_mb_release_context(), but on failure, we've already 3233b844167eSCurt Wohlgemuth * zeroed out ac->ac_b_ex.fe_len, so group_pa->pa_free is not changed. 3234b844167eSCurt Wohlgemuth */ 3235b844167eSCurt Wohlgemuth static void ext4_discard_allocated_blocks(struct ext4_allocation_context *ac) 3236b844167eSCurt Wohlgemuth { 3237b844167eSCurt Wohlgemuth struct ext4_prealloc_space *pa = ac->ac_pa; 323886f0afd4STheodore Ts'o struct ext4_buddy e4b; 323986f0afd4STheodore Ts'o int err; 3240b844167eSCurt Wohlgemuth 324186f0afd4STheodore Ts'o if (pa == NULL) { 3242c99d1e6eSTheodore Ts'o if (ac->ac_f_ex.fe_len == 0) 3243c99d1e6eSTheodore Ts'o return; 324486f0afd4STheodore Ts'o err = ext4_mb_load_buddy(ac->ac_sb, ac->ac_f_ex.fe_group, &e4b); 324586f0afd4STheodore Ts'o if (err) { 324686f0afd4STheodore Ts'o /* 324786f0afd4STheodore Ts'o * This should never happen since we pin the 324886f0afd4STheodore Ts'o * pages in the ext4_allocation_context so 324986f0afd4STheodore Ts'o * ext4_mb_load_buddy() should never fail. 325086f0afd4STheodore Ts'o */ 325186f0afd4STheodore Ts'o WARN(1, "mb_load_buddy failed (%d)", err); 325286f0afd4STheodore Ts'o return; 325386f0afd4STheodore Ts'o } 325486f0afd4STheodore Ts'o ext4_lock_group(ac->ac_sb, ac->ac_f_ex.fe_group); 325586f0afd4STheodore Ts'o mb_free_blocks(ac->ac_inode, &e4b, ac->ac_f_ex.fe_start, 325686f0afd4STheodore Ts'o ac->ac_f_ex.fe_len); 325786f0afd4STheodore Ts'o ext4_unlock_group(ac->ac_sb, ac->ac_f_ex.fe_group); 3258c99d1e6eSTheodore Ts'o ext4_mb_unload_buddy(&e4b); 325986f0afd4STheodore Ts'o return; 326086f0afd4STheodore Ts'o } 326186f0afd4STheodore Ts'o if (pa->pa_type == MB_INODE_PA) 3262400db9d3SZheng Liu pa->pa_free += ac->ac_b_ex.fe_len; 3263b844167eSCurt Wohlgemuth } 3264b844167eSCurt Wohlgemuth 3265b844167eSCurt Wohlgemuth /* 3266c9de560dSAlex Tomas * use blocks preallocated to inode 3267c9de560dSAlex Tomas */ 3268c9de560dSAlex Tomas static void ext4_mb_use_inode_pa(struct ext4_allocation_context *ac, 3269c9de560dSAlex Tomas struct ext4_prealloc_space *pa) 3270c9de560dSAlex Tomas { 327153accfa9STheodore Ts'o struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); 3272c9de560dSAlex Tomas ext4_fsblk_t start; 3273c9de560dSAlex Tomas ext4_fsblk_t end; 3274c9de560dSAlex Tomas int len; 3275c9de560dSAlex Tomas 3276c9de560dSAlex Tomas /* found preallocated blocks, use them */ 3277c9de560dSAlex Tomas start = pa->pa_pstart + (ac->ac_o_ex.fe_logical - pa->pa_lstart); 327853accfa9STheodore Ts'o end = min(pa->pa_pstart + EXT4_C2B(sbi, pa->pa_len), 327953accfa9STheodore Ts'o start + EXT4_C2B(sbi, ac->ac_o_ex.fe_len)); 328053accfa9STheodore Ts'o len = EXT4_NUM_B2C(sbi, end - start); 3281c9de560dSAlex Tomas ext4_get_group_no_and_offset(ac->ac_sb, start, &ac->ac_b_ex.fe_group, 3282c9de560dSAlex Tomas &ac->ac_b_ex.fe_start); 3283c9de560dSAlex Tomas ac->ac_b_ex.fe_len = len; 3284c9de560dSAlex Tomas ac->ac_status = AC_STATUS_FOUND; 3285c9de560dSAlex Tomas ac->ac_pa = pa; 3286c9de560dSAlex Tomas 3287c9de560dSAlex Tomas BUG_ON(start < pa->pa_pstart); 328853accfa9STheodore Ts'o BUG_ON(end > pa->pa_pstart + EXT4_C2B(sbi, pa->pa_len)); 3289c9de560dSAlex Tomas BUG_ON(pa->pa_free < len); 3290c9de560dSAlex Tomas pa->pa_free -= len; 3291c9de560dSAlex Tomas 32926ba495e9STheodore Ts'o mb_debug(1, "use %llu/%u from inode pa %p\n", start, len, pa); 3293c9de560dSAlex Tomas } 3294c9de560dSAlex Tomas 3295c9de560dSAlex Tomas /* 3296c9de560dSAlex Tomas * use blocks preallocated to locality group 3297c9de560dSAlex Tomas */ 3298c9de560dSAlex Tomas static void ext4_mb_use_group_pa(struct ext4_allocation_context *ac, 3299c9de560dSAlex Tomas struct ext4_prealloc_space *pa) 3300c9de560dSAlex Tomas { 330103cddb80SAneesh Kumar K.V unsigned int len = ac->ac_o_ex.fe_len; 33026be2ded1SAneesh Kumar K.V 3303c9de560dSAlex Tomas ext4_get_group_no_and_offset(ac->ac_sb, pa->pa_pstart, 3304c9de560dSAlex Tomas &ac->ac_b_ex.fe_group, 3305c9de560dSAlex Tomas &ac->ac_b_ex.fe_start); 3306c9de560dSAlex Tomas ac->ac_b_ex.fe_len = len; 3307c9de560dSAlex Tomas ac->ac_status = AC_STATUS_FOUND; 3308c9de560dSAlex Tomas ac->ac_pa = pa; 3309c9de560dSAlex Tomas 3310c9de560dSAlex Tomas /* we don't correct pa_pstart or pa_plen here to avoid 331126346ff6SAneesh Kumar K.V * possible race when the group is being loaded concurrently 3312c9de560dSAlex Tomas * instead we correct pa later, after blocks are marked 331326346ff6SAneesh Kumar K.V * in on-disk bitmap -- see ext4_mb_release_context() 331426346ff6SAneesh Kumar K.V * Other CPUs are prevented from allocating from this pa by lg_mutex 3315c9de560dSAlex Tomas */ 33166ba495e9STheodore Ts'o mb_debug(1, "use %u/%u from group pa %p\n", pa->pa_lstart-len, len, pa); 3317c9de560dSAlex Tomas } 3318c9de560dSAlex Tomas 3319c9de560dSAlex Tomas /* 33205e745b04SAneesh Kumar K.V * Return the prealloc space that have minimal distance 33215e745b04SAneesh Kumar K.V * from the goal block. @cpa is the prealloc 33225e745b04SAneesh Kumar K.V * space that is having currently known minimal distance 33235e745b04SAneesh Kumar K.V * from the goal block. 33245e745b04SAneesh Kumar K.V */ 33255e745b04SAneesh Kumar K.V static struct ext4_prealloc_space * 33265e745b04SAneesh Kumar K.V ext4_mb_check_group_pa(ext4_fsblk_t goal_block, 33275e745b04SAneesh Kumar K.V struct ext4_prealloc_space *pa, 33285e745b04SAneesh Kumar K.V struct ext4_prealloc_space *cpa) 33295e745b04SAneesh Kumar K.V { 33305e745b04SAneesh Kumar K.V ext4_fsblk_t cur_distance, new_distance; 33315e745b04SAneesh Kumar K.V 33325e745b04SAneesh Kumar K.V if (cpa == NULL) { 33335e745b04SAneesh Kumar K.V atomic_inc(&pa->pa_count); 33345e745b04SAneesh Kumar K.V return pa; 33355e745b04SAneesh Kumar K.V } 333679211c8eSAndrew Morton cur_distance = abs(goal_block - cpa->pa_pstart); 333779211c8eSAndrew Morton new_distance = abs(goal_block - pa->pa_pstart); 33385e745b04SAneesh Kumar K.V 33395a54b2f1SColy Li if (cur_distance <= new_distance) 33405e745b04SAneesh Kumar K.V return cpa; 33415e745b04SAneesh Kumar K.V 33425e745b04SAneesh Kumar K.V /* drop the previous reference */ 33435e745b04SAneesh Kumar K.V atomic_dec(&cpa->pa_count); 33445e745b04SAneesh Kumar K.V atomic_inc(&pa->pa_count); 33455e745b04SAneesh Kumar K.V return pa; 33465e745b04SAneesh Kumar K.V } 33475e745b04SAneesh Kumar K.V 33485e745b04SAneesh Kumar K.V /* 3349c9de560dSAlex Tomas * search goal blocks in preallocated space 3350c9de560dSAlex Tomas */ 33514ddfef7bSEric Sandeen static noinline_for_stack int 33524ddfef7bSEric Sandeen ext4_mb_use_preallocated(struct ext4_allocation_context *ac) 3353c9de560dSAlex Tomas { 335453accfa9STheodore Ts'o struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); 33556be2ded1SAneesh Kumar K.V int order, i; 3356c9de560dSAlex Tomas struct ext4_inode_info *ei = EXT4_I(ac->ac_inode); 3357c9de560dSAlex Tomas struct ext4_locality_group *lg; 33585e745b04SAneesh Kumar K.V struct ext4_prealloc_space *pa, *cpa = NULL; 33595e745b04SAneesh Kumar K.V ext4_fsblk_t goal_block; 3360c9de560dSAlex Tomas 3361c9de560dSAlex Tomas /* only data can be preallocated */ 3362c9de560dSAlex Tomas if (!(ac->ac_flags & EXT4_MB_HINT_DATA)) 3363c9de560dSAlex Tomas return 0; 3364c9de560dSAlex Tomas 3365c9de560dSAlex Tomas /* first, try per-file preallocation */ 3366c9de560dSAlex Tomas rcu_read_lock(); 33679a0762c5SAneesh Kumar K.V list_for_each_entry_rcu(pa, &ei->i_prealloc_list, pa_inode_list) { 3368c9de560dSAlex Tomas 3369c9de560dSAlex Tomas /* all fields in this condition don't change, 3370c9de560dSAlex Tomas * so we can skip locking for them */ 3371c9de560dSAlex Tomas if (ac->ac_o_ex.fe_logical < pa->pa_lstart || 337253accfa9STheodore Ts'o ac->ac_o_ex.fe_logical >= (pa->pa_lstart + 337353accfa9STheodore Ts'o EXT4_C2B(sbi, pa->pa_len))) 3374c9de560dSAlex Tomas continue; 3375c9de560dSAlex Tomas 3376fb0a387dSEric Sandeen /* non-extent files can't have physical blocks past 2^32 */ 337712e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(ac->ac_inode, EXT4_INODE_EXTENTS)) && 337853accfa9STheodore Ts'o (pa->pa_pstart + EXT4_C2B(sbi, pa->pa_len) > 337953accfa9STheodore Ts'o EXT4_MAX_BLOCK_FILE_PHYS)) 3380fb0a387dSEric Sandeen continue; 3381fb0a387dSEric Sandeen 3382c9de560dSAlex Tomas /* found preallocated blocks, use them */ 3383c9de560dSAlex Tomas spin_lock(&pa->pa_lock); 3384c9de560dSAlex Tomas if (pa->pa_deleted == 0 && pa->pa_free) { 3385c9de560dSAlex Tomas atomic_inc(&pa->pa_count); 3386c9de560dSAlex Tomas ext4_mb_use_inode_pa(ac, pa); 3387c9de560dSAlex Tomas spin_unlock(&pa->pa_lock); 3388c9de560dSAlex Tomas ac->ac_criteria = 10; 3389c9de560dSAlex Tomas rcu_read_unlock(); 3390c9de560dSAlex Tomas return 1; 3391c9de560dSAlex Tomas } 3392c9de560dSAlex Tomas spin_unlock(&pa->pa_lock); 3393c9de560dSAlex Tomas } 3394c9de560dSAlex Tomas rcu_read_unlock(); 3395c9de560dSAlex Tomas 3396c9de560dSAlex Tomas /* can we use group allocation? */ 3397c9de560dSAlex Tomas if (!(ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC)) 3398c9de560dSAlex Tomas return 0; 3399c9de560dSAlex Tomas 3400c9de560dSAlex Tomas /* inode may have no locality group for some reason */ 3401c9de560dSAlex Tomas lg = ac->ac_lg; 3402c9de560dSAlex Tomas if (lg == NULL) 3403c9de560dSAlex Tomas return 0; 34046be2ded1SAneesh Kumar K.V order = fls(ac->ac_o_ex.fe_len) - 1; 34056be2ded1SAneesh Kumar K.V if (order > PREALLOC_TB_SIZE - 1) 34066be2ded1SAneesh Kumar K.V /* The max size of hash table is PREALLOC_TB_SIZE */ 34076be2ded1SAneesh Kumar K.V order = PREALLOC_TB_SIZE - 1; 3408c9de560dSAlex Tomas 3409bda00de7SAkinobu Mita goal_block = ext4_grp_offs_to_block(ac->ac_sb, &ac->ac_g_ex); 34105e745b04SAneesh Kumar K.V /* 34115e745b04SAneesh Kumar K.V * search for the prealloc space that is having 34125e745b04SAneesh Kumar K.V * minimal distance from the goal block. 34135e745b04SAneesh Kumar K.V */ 34146be2ded1SAneesh Kumar K.V for (i = order; i < PREALLOC_TB_SIZE; i++) { 3415c9de560dSAlex Tomas rcu_read_lock(); 34166be2ded1SAneesh Kumar K.V list_for_each_entry_rcu(pa, &lg->lg_prealloc_list[i], 34176be2ded1SAneesh Kumar K.V pa_inode_list) { 3418c9de560dSAlex Tomas spin_lock(&pa->pa_lock); 34196be2ded1SAneesh Kumar K.V if (pa->pa_deleted == 0 && 34206be2ded1SAneesh Kumar K.V pa->pa_free >= ac->ac_o_ex.fe_len) { 34215e745b04SAneesh Kumar K.V 34225e745b04SAneesh Kumar K.V cpa = ext4_mb_check_group_pa(goal_block, 34235e745b04SAneesh Kumar K.V pa, cpa); 34245e745b04SAneesh Kumar K.V } 3425c9de560dSAlex Tomas spin_unlock(&pa->pa_lock); 34265e745b04SAneesh Kumar K.V } 34275e745b04SAneesh Kumar K.V rcu_read_unlock(); 34285e745b04SAneesh Kumar K.V } 34295e745b04SAneesh Kumar K.V if (cpa) { 34305e745b04SAneesh Kumar K.V ext4_mb_use_group_pa(ac, cpa); 3431c9de560dSAlex Tomas ac->ac_criteria = 20; 3432c9de560dSAlex Tomas return 1; 3433c9de560dSAlex Tomas } 3434c9de560dSAlex Tomas return 0; 3435c9de560dSAlex Tomas } 3436c9de560dSAlex Tomas 3437c9de560dSAlex Tomas /* 34387a2fcbf7SAneesh Kumar K.V * the function goes through all block freed in the group 34397a2fcbf7SAneesh Kumar K.V * but not yet committed and marks them used in in-core bitmap. 34407a2fcbf7SAneesh Kumar K.V * buddy must be generated from this bitmap 3441955ce5f5SAneesh Kumar K.V * Need to be called with the ext4 group lock held 34427a2fcbf7SAneesh Kumar K.V */ 34437a2fcbf7SAneesh Kumar K.V static void ext4_mb_generate_from_freelist(struct super_block *sb, void *bitmap, 34447a2fcbf7SAneesh Kumar K.V ext4_group_t group) 34457a2fcbf7SAneesh Kumar K.V { 34467a2fcbf7SAneesh Kumar K.V struct rb_node *n; 34477a2fcbf7SAneesh Kumar K.V struct ext4_group_info *grp; 34487a2fcbf7SAneesh Kumar K.V struct ext4_free_data *entry; 34497a2fcbf7SAneesh Kumar K.V 34507a2fcbf7SAneesh Kumar K.V grp = ext4_get_group_info(sb, group); 34517a2fcbf7SAneesh Kumar K.V n = rb_first(&(grp->bb_free_root)); 34527a2fcbf7SAneesh Kumar K.V 34537a2fcbf7SAneesh Kumar K.V while (n) { 345418aadd47SBobi Jam entry = rb_entry(n, struct ext4_free_data, efd_node); 345518aadd47SBobi Jam ext4_set_bits(bitmap, entry->efd_start_cluster, entry->efd_count); 34567a2fcbf7SAneesh Kumar K.V n = rb_next(n); 34577a2fcbf7SAneesh Kumar K.V } 34587a2fcbf7SAneesh Kumar K.V return; 34597a2fcbf7SAneesh Kumar K.V } 34607a2fcbf7SAneesh Kumar K.V 34617a2fcbf7SAneesh Kumar K.V /* 3462c9de560dSAlex Tomas * the function goes through all preallocation in this group and marks them 3463c9de560dSAlex Tomas * used in in-core bitmap. buddy must be generated from this bitmap 3464955ce5f5SAneesh Kumar K.V * Need to be called with ext4 group lock held 3465c9de560dSAlex Tomas */ 3466089ceeccSEric Sandeen static noinline_for_stack 3467089ceeccSEric Sandeen void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap, 3468c9de560dSAlex Tomas ext4_group_t group) 3469c9de560dSAlex Tomas { 3470c9de560dSAlex Tomas struct ext4_group_info *grp = ext4_get_group_info(sb, group); 3471c9de560dSAlex Tomas struct ext4_prealloc_space *pa; 3472c9de560dSAlex Tomas struct list_head *cur; 3473c9de560dSAlex Tomas ext4_group_t groupnr; 3474c9de560dSAlex Tomas ext4_grpblk_t start; 3475c9de560dSAlex Tomas int preallocated = 0; 3476c9de560dSAlex Tomas int len; 3477c9de560dSAlex Tomas 3478c9de560dSAlex Tomas /* all form of preallocation discards first load group, 3479c9de560dSAlex Tomas * so the only competing code is preallocation use. 3480c9de560dSAlex Tomas * we don't need any locking here 3481c9de560dSAlex Tomas * notice we do NOT ignore preallocations with pa_deleted 3482c9de560dSAlex Tomas * otherwise we could leave used blocks available for 3483c9de560dSAlex Tomas * allocation in buddy when concurrent ext4_mb_put_pa() 3484c9de560dSAlex Tomas * is dropping preallocation 3485c9de560dSAlex Tomas */ 3486c9de560dSAlex Tomas list_for_each(cur, &grp->bb_prealloc_list) { 3487c9de560dSAlex Tomas pa = list_entry(cur, struct ext4_prealloc_space, pa_group_list); 3488c9de560dSAlex Tomas spin_lock(&pa->pa_lock); 3489c9de560dSAlex Tomas ext4_get_group_no_and_offset(sb, pa->pa_pstart, 3490c9de560dSAlex Tomas &groupnr, &start); 3491c9de560dSAlex Tomas len = pa->pa_len; 3492c9de560dSAlex Tomas spin_unlock(&pa->pa_lock); 3493c9de560dSAlex Tomas if (unlikely(len == 0)) 3494c9de560dSAlex Tomas continue; 3495c9de560dSAlex Tomas BUG_ON(groupnr != group); 3496c3e94d1dSYongqiang Yang ext4_set_bits(bitmap, start, len); 3497c9de560dSAlex Tomas preallocated += len; 3498c9de560dSAlex Tomas } 34996ba495e9STheodore Ts'o mb_debug(1, "prellocated %u for group %u\n", preallocated, group); 3500c9de560dSAlex Tomas } 3501c9de560dSAlex Tomas 3502c9de560dSAlex Tomas static void ext4_mb_pa_callback(struct rcu_head *head) 3503c9de560dSAlex Tomas { 3504c9de560dSAlex Tomas struct ext4_prealloc_space *pa; 3505c9de560dSAlex Tomas pa = container_of(head, struct ext4_prealloc_space, u.pa_rcu); 35064e8d2139SJunho Ryu 35074e8d2139SJunho Ryu BUG_ON(atomic_read(&pa->pa_count)); 35084e8d2139SJunho Ryu BUG_ON(pa->pa_deleted == 0); 3509c9de560dSAlex Tomas kmem_cache_free(ext4_pspace_cachep, pa); 3510c9de560dSAlex Tomas } 3511c9de560dSAlex Tomas 3512c9de560dSAlex Tomas /* 3513c9de560dSAlex Tomas * drops a reference to preallocated space descriptor 3514c9de560dSAlex Tomas * if this was the last reference and the space is consumed 3515c9de560dSAlex Tomas */ 3516c9de560dSAlex Tomas static void ext4_mb_put_pa(struct ext4_allocation_context *ac, 3517c9de560dSAlex Tomas struct super_block *sb, struct ext4_prealloc_space *pa) 3518c9de560dSAlex Tomas { 3519a9df9a49STheodore Ts'o ext4_group_t grp; 3520d33a1976SEric Sandeen ext4_fsblk_t grp_blk; 3521c9de560dSAlex Tomas 3522c9de560dSAlex Tomas /* in this short window concurrent discard can set pa_deleted */ 3523c9de560dSAlex Tomas spin_lock(&pa->pa_lock); 35244e8d2139SJunho Ryu if (!atomic_dec_and_test(&pa->pa_count) || pa->pa_free != 0) { 35254e8d2139SJunho Ryu spin_unlock(&pa->pa_lock); 35264e8d2139SJunho Ryu return; 35274e8d2139SJunho Ryu } 35284e8d2139SJunho Ryu 3529c9de560dSAlex Tomas if (pa->pa_deleted == 1) { 3530c9de560dSAlex Tomas spin_unlock(&pa->pa_lock); 3531c9de560dSAlex Tomas return; 3532c9de560dSAlex Tomas } 3533c9de560dSAlex Tomas 3534c9de560dSAlex Tomas pa->pa_deleted = 1; 3535c9de560dSAlex Tomas spin_unlock(&pa->pa_lock); 3536c9de560dSAlex Tomas 3537d33a1976SEric Sandeen grp_blk = pa->pa_pstart; 3538cc0fb9adSAneesh Kumar K.V /* 3539cc0fb9adSAneesh Kumar K.V * If doing group-based preallocation, pa_pstart may be in the 3540cc0fb9adSAneesh Kumar K.V * next group when pa is used up 3541cc0fb9adSAneesh Kumar K.V */ 3542cc0fb9adSAneesh Kumar K.V if (pa->pa_type == MB_GROUP_PA) 3543d33a1976SEric Sandeen grp_blk--; 3544d33a1976SEric Sandeen 3545bd86298eSLukas Czerner grp = ext4_get_group_number(sb, grp_blk); 3546c9de560dSAlex Tomas 3547c9de560dSAlex Tomas /* 3548c9de560dSAlex Tomas * possible race: 3549c9de560dSAlex Tomas * 3550c9de560dSAlex Tomas * P1 (buddy init) P2 (regular allocation) 3551c9de560dSAlex Tomas * find block B in PA 3552c9de560dSAlex Tomas * copy on-disk bitmap to buddy 3553c9de560dSAlex Tomas * mark B in on-disk bitmap 3554c9de560dSAlex Tomas * drop PA from group 3555c9de560dSAlex Tomas * mark all PAs in buddy 3556c9de560dSAlex Tomas * 3557c9de560dSAlex Tomas * thus, P1 initializes buddy with B available. to prevent this 3558c9de560dSAlex Tomas * we make "copy" and "mark all PAs" atomic and serialize "drop PA" 3559c9de560dSAlex Tomas * against that pair 3560c9de560dSAlex Tomas */ 3561c9de560dSAlex Tomas ext4_lock_group(sb, grp); 3562c9de560dSAlex Tomas list_del(&pa->pa_group_list); 3563c9de560dSAlex Tomas ext4_unlock_group(sb, grp); 3564c9de560dSAlex Tomas 3565c9de560dSAlex Tomas spin_lock(pa->pa_obj_lock); 3566c9de560dSAlex Tomas list_del_rcu(&pa->pa_inode_list); 3567c9de560dSAlex Tomas spin_unlock(pa->pa_obj_lock); 3568c9de560dSAlex Tomas 3569c9de560dSAlex Tomas call_rcu(&(pa)->u.pa_rcu, ext4_mb_pa_callback); 3570c9de560dSAlex Tomas } 3571c9de560dSAlex Tomas 3572c9de560dSAlex Tomas /* 3573c9de560dSAlex Tomas * creates new preallocated space for given inode 3574c9de560dSAlex Tomas */ 35754ddfef7bSEric Sandeen static noinline_for_stack int 35764ddfef7bSEric Sandeen ext4_mb_new_inode_pa(struct ext4_allocation_context *ac) 3577c9de560dSAlex Tomas { 3578c9de560dSAlex Tomas struct super_block *sb = ac->ac_sb; 357953accfa9STheodore Ts'o struct ext4_sb_info *sbi = EXT4_SB(sb); 3580c9de560dSAlex Tomas struct ext4_prealloc_space *pa; 3581c9de560dSAlex Tomas struct ext4_group_info *grp; 3582c9de560dSAlex Tomas struct ext4_inode_info *ei; 3583c9de560dSAlex Tomas 3584c9de560dSAlex Tomas /* preallocate only when found space is larger then requested */ 3585c9de560dSAlex Tomas BUG_ON(ac->ac_o_ex.fe_len >= ac->ac_b_ex.fe_len); 3586c9de560dSAlex Tomas BUG_ON(ac->ac_status != AC_STATUS_FOUND); 3587c9de560dSAlex Tomas BUG_ON(!S_ISREG(ac->ac_inode->i_mode)); 3588c9de560dSAlex Tomas 3589c9de560dSAlex Tomas pa = kmem_cache_alloc(ext4_pspace_cachep, GFP_NOFS); 3590c9de560dSAlex Tomas if (pa == NULL) 3591c9de560dSAlex Tomas return -ENOMEM; 3592c9de560dSAlex Tomas 3593c9de560dSAlex Tomas if (ac->ac_b_ex.fe_len < ac->ac_g_ex.fe_len) { 3594c9de560dSAlex Tomas int winl; 3595c9de560dSAlex Tomas int wins; 3596c9de560dSAlex Tomas int win; 3597c9de560dSAlex Tomas int offs; 3598c9de560dSAlex Tomas 3599c9de560dSAlex Tomas /* we can't allocate as much as normalizer wants. 3600c9de560dSAlex Tomas * so, found space must get proper lstart 3601c9de560dSAlex Tomas * to cover original request */ 3602c9de560dSAlex Tomas BUG_ON(ac->ac_g_ex.fe_logical > ac->ac_o_ex.fe_logical); 3603c9de560dSAlex Tomas BUG_ON(ac->ac_g_ex.fe_len < ac->ac_o_ex.fe_len); 3604c9de560dSAlex Tomas 3605c9de560dSAlex Tomas /* we're limited by original request in that 3606c9de560dSAlex Tomas * logical block must be covered any way 3607c9de560dSAlex Tomas * winl is window we can move our chunk within */ 3608c9de560dSAlex Tomas winl = ac->ac_o_ex.fe_logical - ac->ac_g_ex.fe_logical; 3609c9de560dSAlex Tomas 3610c9de560dSAlex Tomas /* also, we should cover whole original request */ 361153accfa9STheodore Ts'o wins = EXT4_C2B(sbi, ac->ac_b_ex.fe_len - ac->ac_o_ex.fe_len); 3612c9de560dSAlex Tomas 3613c9de560dSAlex Tomas /* the smallest one defines real window */ 3614c9de560dSAlex Tomas win = min(winl, wins); 3615c9de560dSAlex Tomas 361653accfa9STheodore Ts'o offs = ac->ac_o_ex.fe_logical % 361753accfa9STheodore Ts'o EXT4_C2B(sbi, ac->ac_b_ex.fe_len); 3618c9de560dSAlex Tomas if (offs && offs < win) 3619c9de560dSAlex Tomas win = offs; 3620c9de560dSAlex Tomas 362153accfa9STheodore Ts'o ac->ac_b_ex.fe_logical = ac->ac_o_ex.fe_logical - 3622810da240SLukas Czerner EXT4_NUM_B2C(sbi, win); 3623c9de560dSAlex Tomas BUG_ON(ac->ac_o_ex.fe_logical < ac->ac_b_ex.fe_logical); 3624c9de560dSAlex Tomas BUG_ON(ac->ac_o_ex.fe_len > ac->ac_b_ex.fe_len); 3625c9de560dSAlex Tomas } 3626c9de560dSAlex Tomas 3627c9de560dSAlex Tomas /* preallocation can change ac_b_ex, thus we store actually 3628c9de560dSAlex Tomas * allocated blocks for history */ 3629c9de560dSAlex Tomas ac->ac_f_ex = ac->ac_b_ex; 3630c9de560dSAlex Tomas 3631c9de560dSAlex Tomas pa->pa_lstart = ac->ac_b_ex.fe_logical; 3632c9de560dSAlex Tomas pa->pa_pstart = ext4_grp_offs_to_block(sb, &ac->ac_b_ex); 3633c9de560dSAlex Tomas pa->pa_len = ac->ac_b_ex.fe_len; 3634c9de560dSAlex Tomas pa->pa_free = pa->pa_len; 3635c9de560dSAlex Tomas atomic_set(&pa->pa_count, 1); 3636c9de560dSAlex Tomas spin_lock_init(&pa->pa_lock); 3637d794bf8eSAneesh Kumar K.V INIT_LIST_HEAD(&pa->pa_inode_list); 3638d794bf8eSAneesh Kumar K.V INIT_LIST_HEAD(&pa->pa_group_list); 3639c9de560dSAlex Tomas pa->pa_deleted = 0; 3640cc0fb9adSAneesh Kumar K.V pa->pa_type = MB_INODE_PA; 3641c9de560dSAlex Tomas 36426ba495e9STheodore Ts'o mb_debug(1, "new inode pa %p: %llu/%u for %u\n", pa, 3643c9de560dSAlex Tomas pa->pa_pstart, pa->pa_len, pa->pa_lstart); 36449bffad1eSTheodore Ts'o trace_ext4_mb_new_inode_pa(ac, pa); 3645c9de560dSAlex Tomas 3646c9de560dSAlex Tomas ext4_mb_use_inode_pa(ac, pa); 364753accfa9STheodore Ts'o atomic_add(pa->pa_free, &sbi->s_mb_preallocated); 3648c9de560dSAlex Tomas 3649c9de560dSAlex Tomas ei = EXT4_I(ac->ac_inode); 3650c9de560dSAlex Tomas grp = ext4_get_group_info(sb, ac->ac_b_ex.fe_group); 3651c9de560dSAlex Tomas 3652c9de560dSAlex Tomas pa->pa_obj_lock = &ei->i_prealloc_lock; 3653c9de560dSAlex Tomas pa->pa_inode = ac->ac_inode; 3654c9de560dSAlex Tomas 3655c9de560dSAlex Tomas ext4_lock_group(sb, ac->ac_b_ex.fe_group); 3656c9de560dSAlex Tomas list_add(&pa->pa_group_list, &grp->bb_prealloc_list); 3657c9de560dSAlex Tomas ext4_unlock_group(sb, ac->ac_b_ex.fe_group); 3658c9de560dSAlex Tomas 3659c9de560dSAlex Tomas spin_lock(pa->pa_obj_lock); 3660c9de560dSAlex Tomas list_add_rcu(&pa->pa_inode_list, &ei->i_prealloc_list); 3661c9de560dSAlex Tomas spin_unlock(pa->pa_obj_lock); 3662c9de560dSAlex Tomas 3663c9de560dSAlex Tomas return 0; 3664c9de560dSAlex Tomas } 3665c9de560dSAlex Tomas 3666c9de560dSAlex Tomas /* 3667c9de560dSAlex Tomas * creates new preallocated space for locality group inodes belongs to 3668c9de560dSAlex Tomas */ 36694ddfef7bSEric Sandeen static noinline_for_stack int 36704ddfef7bSEric Sandeen ext4_mb_new_group_pa(struct ext4_allocation_context *ac) 3671c9de560dSAlex Tomas { 3672c9de560dSAlex Tomas struct super_block *sb = ac->ac_sb; 3673c9de560dSAlex Tomas struct ext4_locality_group *lg; 3674c9de560dSAlex Tomas struct ext4_prealloc_space *pa; 3675c9de560dSAlex Tomas struct ext4_group_info *grp; 3676c9de560dSAlex Tomas 3677c9de560dSAlex Tomas /* preallocate only when found space is larger then requested */ 3678c9de560dSAlex Tomas BUG_ON(ac->ac_o_ex.fe_len >= ac->ac_b_ex.fe_len); 3679c9de560dSAlex Tomas BUG_ON(ac->ac_status != AC_STATUS_FOUND); 3680c9de560dSAlex Tomas BUG_ON(!S_ISREG(ac->ac_inode->i_mode)); 3681c9de560dSAlex Tomas 3682c9de560dSAlex Tomas BUG_ON(ext4_pspace_cachep == NULL); 3683c9de560dSAlex Tomas pa = kmem_cache_alloc(ext4_pspace_cachep, GFP_NOFS); 3684c9de560dSAlex Tomas if (pa == NULL) 3685c9de560dSAlex Tomas return -ENOMEM; 3686c9de560dSAlex Tomas 3687c9de560dSAlex Tomas /* preallocation can change ac_b_ex, thus we store actually 3688c9de560dSAlex Tomas * allocated blocks for history */ 3689c9de560dSAlex Tomas ac->ac_f_ex = ac->ac_b_ex; 3690c9de560dSAlex Tomas 3691c9de560dSAlex Tomas pa->pa_pstart = ext4_grp_offs_to_block(sb, &ac->ac_b_ex); 3692c9de560dSAlex Tomas pa->pa_lstart = pa->pa_pstart; 3693c9de560dSAlex Tomas pa->pa_len = ac->ac_b_ex.fe_len; 3694c9de560dSAlex Tomas pa->pa_free = pa->pa_len; 3695c9de560dSAlex Tomas atomic_set(&pa->pa_count, 1); 3696c9de560dSAlex Tomas spin_lock_init(&pa->pa_lock); 36976be2ded1SAneesh Kumar K.V INIT_LIST_HEAD(&pa->pa_inode_list); 3698d794bf8eSAneesh Kumar K.V INIT_LIST_HEAD(&pa->pa_group_list); 3699c9de560dSAlex Tomas pa->pa_deleted = 0; 3700cc0fb9adSAneesh Kumar K.V pa->pa_type = MB_GROUP_PA; 3701c9de560dSAlex Tomas 37026ba495e9STheodore Ts'o mb_debug(1, "new group pa %p: %llu/%u for %u\n", pa, 3703c9de560dSAlex Tomas pa->pa_pstart, pa->pa_len, pa->pa_lstart); 37049bffad1eSTheodore Ts'o trace_ext4_mb_new_group_pa(ac, pa); 3705c9de560dSAlex Tomas 3706c9de560dSAlex Tomas ext4_mb_use_group_pa(ac, pa); 3707c9de560dSAlex Tomas atomic_add(pa->pa_free, &EXT4_SB(sb)->s_mb_preallocated); 3708c9de560dSAlex Tomas 3709c9de560dSAlex Tomas grp = ext4_get_group_info(sb, ac->ac_b_ex.fe_group); 3710c9de560dSAlex Tomas lg = ac->ac_lg; 3711c9de560dSAlex Tomas BUG_ON(lg == NULL); 3712c9de560dSAlex Tomas 3713c9de560dSAlex Tomas pa->pa_obj_lock = &lg->lg_prealloc_lock; 3714c9de560dSAlex Tomas pa->pa_inode = NULL; 3715c9de560dSAlex Tomas 3716c9de560dSAlex Tomas ext4_lock_group(sb, ac->ac_b_ex.fe_group); 3717c9de560dSAlex Tomas list_add(&pa->pa_group_list, &grp->bb_prealloc_list); 3718c9de560dSAlex Tomas ext4_unlock_group(sb, ac->ac_b_ex.fe_group); 3719c9de560dSAlex Tomas 37206be2ded1SAneesh Kumar K.V /* 37216be2ded1SAneesh Kumar K.V * We will later add the new pa to the right bucket 37226be2ded1SAneesh Kumar K.V * after updating the pa_free in ext4_mb_release_context 37236be2ded1SAneesh Kumar K.V */ 3724c9de560dSAlex Tomas return 0; 3725c9de560dSAlex Tomas } 3726c9de560dSAlex Tomas 3727c9de560dSAlex Tomas static int ext4_mb_new_preallocation(struct ext4_allocation_context *ac) 3728c9de560dSAlex Tomas { 3729c9de560dSAlex Tomas int err; 3730c9de560dSAlex Tomas 3731c9de560dSAlex Tomas if (ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC) 3732c9de560dSAlex Tomas err = ext4_mb_new_group_pa(ac); 3733c9de560dSAlex Tomas else 3734c9de560dSAlex Tomas err = ext4_mb_new_inode_pa(ac); 3735c9de560dSAlex Tomas return err; 3736c9de560dSAlex Tomas } 3737c9de560dSAlex Tomas 3738c9de560dSAlex Tomas /* 3739c9de560dSAlex Tomas * finds all unused blocks in on-disk bitmap, frees them in 3740c9de560dSAlex Tomas * in-core bitmap and buddy. 3741c9de560dSAlex Tomas * @pa must be unlinked from inode and group lists, so that 3742c9de560dSAlex Tomas * nobody else can find/use it. 3743c9de560dSAlex Tomas * the caller MUST hold group/inode locks. 3744c9de560dSAlex Tomas * TODO: optimize the case when there are no in-core structures yet 3745c9de560dSAlex Tomas */ 37464ddfef7bSEric Sandeen static noinline_for_stack int 37474ddfef7bSEric Sandeen ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh, 37483e1e5f50SEric Sandeen struct ext4_prealloc_space *pa) 3749c9de560dSAlex Tomas { 3750c9de560dSAlex Tomas struct super_block *sb = e4b->bd_sb; 3751c9de560dSAlex Tomas struct ext4_sb_info *sbi = EXT4_SB(sb); 3752498e5f24STheodore Ts'o unsigned int end; 3753498e5f24STheodore Ts'o unsigned int next; 3754c9de560dSAlex Tomas ext4_group_t group; 3755c9de560dSAlex Tomas ext4_grpblk_t bit; 3756ba80b101STheodore Ts'o unsigned long long grp_blk_start; 3757c9de560dSAlex Tomas int err = 0; 3758c9de560dSAlex Tomas int free = 0; 3759c9de560dSAlex Tomas 3760c9de560dSAlex Tomas BUG_ON(pa->pa_deleted == 0); 3761c9de560dSAlex Tomas ext4_get_group_no_and_offset(sb, pa->pa_pstart, &group, &bit); 376253accfa9STheodore Ts'o grp_blk_start = pa->pa_pstart - EXT4_C2B(sbi, bit); 3763c9de560dSAlex Tomas BUG_ON(group != e4b->bd_group && pa->pa_len != 0); 3764c9de560dSAlex Tomas end = bit + pa->pa_len; 3765c9de560dSAlex Tomas 3766c9de560dSAlex Tomas while (bit < end) { 3767ffad0a44SAneesh Kumar K.V bit = mb_find_next_zero_bit(bitmap_bh->b_data, end, bit); 3768c9de560dSAlex Tomas if (bit >= end) 3769c9de560dSAlex Tomas break; 3770ffad0a44SAneesh Kumar K.V next = mb_find_next_bit(bitmap_bh->b_data, end, bit); 37716ba495e9STheodore Ts'o mb_debug(1, " free preallocated %u/%u in group %u\n", 37725a0790c2SAndi Kleen (unsigned) ext4_group_first_block_no(sb, group) + bit, 37735a0790c2SAndi Kleen (unsigned) next - bit, (unsigned) group); 3774c9de560dSAlex Tomas free += next - bit; 3775c9de560dSAlex Tomas 37763e1e5f50SEric Sandeen trace_ext4_mballoc_discard(sb, NULL, group, bit, next - bit); 377753accfa9STheodore Ts'o trace_ext4_mb_release_inode_pa(pa, (grp_blk_start + 377853accfa9STheodore Ts'o EXT4_C2B(sbi, bit)), 3779a9c667f8SLukas Czerner next - bit); 3780c9de560dSAlex Tomas mb_free_blocks(pa->pa_inode, e4b, bit, next - bit); 3781c9de560dSAlex Tomas bit = next + 1; 3782c9de560dSAlex Tomas } 3783c9de560dSAlex Tomas if (free != pa->pa_free) { 37849d8b9ec4STheodore Ts'o ext4_msg(e4b->bd_sb, KERN_CRIT, 37859d8b9ec4STheodore Ts'o "pa %p: logic %lu, phys. %lu, len %lu", 3786c9de560dSAlex Tomas pa, (unsigned long) pa->pa_lstart, 3787c9de560dSAlex Tomas (unsigned long) pa->pa_pstart, 3788c9de560dSAlex Tomas (unsigned long) pa->pa_len); 3789e29136f8STheodore Ts'o ext4_grp_locked_error(sb, group, 0, 0, "free %u, pa_free %u", 379026346ff6SAneesh Kumar K.V free, pa->pa_free); 3791e56eb659SAneesh Kumar K.V /* 3792e56eb659SAneesh Kumar K.V * pa is already deleted so we use the value obtained 3793e56eb659SAneesh Kumar K.V * from the bitmap and continue. 3794e56eb659SAneesh Kumar K.V */ 3795c9de560dSAlex Tomas } 3796c9de560dSAlex Tomas atomic_add(free, &sbi->s_mb_discarded); 3797c9de560dSAlex Tomas 3798c9de560dSAlex Tomas return err; 3799c9de560dSAlex Tomas } 3800c9de560dSAlex Tomas 38014ddfef7bSEric Sandeen static noinline_for_stack int 38024ddfef7bSEric Sandeen ext4_mb_release_group_pa(struct ext4_buddy *e4b, 38033e1e5f50SEric Sandeen struct ext4_prealloc_space *pa) 3804c9de560dSAlex Tomas { 3805c9de560dSAlex Tomas struct super_block *sb = e4b->bd_sb; 3806c9de560dSAlex Tomas ext4_group_t group; 3807c9de560dSAlex Tomas ext4_grpblk_t bit; 3808c9de560dSAlex Tomas 380960e07cf5SYongqiang Yang trace_ext4_mb_release_group_pa(sb, pa); 3810c9de560dSAlex Tomas BUG_ON(pa->pa_deleted == 0); 3811c9de560dSAlex Tomas ext4_get_group_no_and_offset(sb, pa->pa_pstart, &group, &bit); 3812c9de560dSAlex Tomas BUG_ON(group != e4b->bd_group && pa->pa_len != 0); 3813c9de560dSAlex Tomas mb_free_blocks(pa->pa_inode, e4b, bit, pa->pa_len); 3814c9de560dSAlex Tomas atomic_add(pa->pa_len, &EXT4_SB(sb)->s_mb_discarded); 38153e1e5f50SEric Sandeen trace_ext4_mballoc_discard(sb, NULL, group, bit, pa->pa_len); 3816c9de560dSAlex Tomas 3817c9de560dSAlex Tomas return 0; 3818c9de560dSAlex Tomas } 3819c9de560dSAlex Tomas 3820c9de560dSAlex Tomas /* 3821c9de560dSAlex Tomas * releases all preallocations in given group 3822c9de560dSAlex Tomas * 3823c9de560dSAlex Tomas * first, we need to decide discard policy: 3824c9de560dSAlex Tomas * - when do we discard 3825c9de560dSAlex Tomas * 1) ENOSPC 3826c9de560dSAlex Tomas * - how many do we discard 3827c9de560dSAlex Tomas * 1) how many requested 3828c9de560dSAlex Tomas */ 38294ddfef7bSEric Sandeen static noinline_for_stack int 38304ddfef7bSEric Sandeen ext4_mb_discard_group_preallocations(struct super_block *sb, 3831c9de560dSAlex Tomas ext4_group_t group, int needed) 3832c9de560dSAlex Tomas { 3833c9de560dSAlex Tomas struct ext4_group_info *grp = ext4_get_group_info(sb, group); 3834c9de560dSAlex Tomas struct buffer_head *bitmap_bh = NULL; 3835c9de560dSAlex Tomas struct ext4_prealloc_space *pa, *tmp; 3836c9de560dSAlex Tomas struct list_head list; 3837c9de560dSAlex Tomas struct ext4_buddy e4b; 3838c9de560dSAlex Tomas int err; 3839c9de560dSAlex Tomas int busy = 0; 3840c9de560dSAlex Tomas int free = 0; 3841c9de560dSAlex Tomas 38426ba495e9STheodore Ts'o mb_debug(1, "discard preallocation for group %u\n", group); 3843c9de560dSAlex Tomas 3844c9de560dSAlex Tomas if (list_empty(&grp->bb_prealloc_list)) 3845c9de560dSAlex Tomas return 0; 3846c9de560dSAlex Tomas 3847574ca174STheodore Ts'o bitmap_bh = ext4_read_block_bitmap(sb, group); 38489008a58eSDarrick J. Wong if (IS_ERR(bitmap_bh)) { 38499008a58eSDarrick J. Wong err = PTR_ERR(bitmap_bh); 38509008a58eSDarrick J. Wong ext4_error(sb, "Error %d reading block bitmap for %u", 38519008a58eSDarrick J. Wong err, group); 3852ce89f46cSAneesh Kumar K.V return 0; 3853c9de560dSAlex Tomas } 3854c9de560dSAlex Tomas 3855c9de560dSAlex Tomas err = ext4_mb_load_buddy(sb, group, &e4b); 3856ce89f46cSAneesh Kumar K.V if (err) { 385712062dddSEric Sandeen ext4_error(sb, "Error loading buddy information for %u", group); 3858ce89f46cSAneesh Kumar K.V put_bh(bitmap_bh); 3859ce89f46cSAneesh Kumar K.V return 0; 3860ce89f46cSAneesh Kumar K.V } 3861c9de560dSAlex Tomas 3862c9de560dSAlex Tomas if (needed == 0) 38637137d7a4STheodore Ts'o needed = EXT4_CLUSTERS_PER_GROUP(sb) + 1; 3864c9de560dSAlex Tomas 3865c9de560dSAlex Tomas INIT_LIST_HEAD(&list); 3866c9de560dSAlex Tomas repeat: 3867c9de560dSAlex Tomas ext4_lock_group(sb, group); 3868c9de560dSAlex Tomas list_for_each_entry_safe(pa, tmp, 3869c9de560dSAlex Tomas &grp->bb_prealloc_list, pa_group_list) { 3870c9de560dSAlex Tomas spin_lock(&pa->pa_lock); 3871c9de560dSAlex Tomas if (atomic_read(&pa->pa_count)) { 3872c9de560dSAlex Tomas spin_unlock(&pa->pa_lock); 3873c9de560dSAlex Tomas busy = 1; 3874c9de560dSAlex Tomas continue; 3875c9de560dSAlex Tomas } 3876c9de560dSAlex Tomas if (pa->pa_deleted) { 3877c9de560dSAlex Tomas spin_unlock(&pa->pa_lock); 3878c9de560dSAlex Tomas continue; 3879c9de560dSAlex Tomas } 3880c9de560dSAlex Tomas 3881c9de560dSAlex Tomas /* seems this one can be freed ... */ 3882c9de560dSAlex Tomas pa->pa_deleted = 1; 3883c9de560dSAlex Tomas 3884c9de560dSAlex Tomas /* we can trust pa_free ... */ 3885c9de560dSAlex Tomas free += pa->pa_free; 3886c9de560dSAlex Tomas 3887c9de560dSAlex Tomas spin_unlock(&pa->pa_lock); 3888c9de560dSAlex Tomas 3889c9de560dSAlex Tomas list_del(&pa->pa_group_list); 3890c9de560dSAlex Tomas list_add(&pa->u.pa_tmp_list, &list); 3891c9de560dSAlex Tomas } 3892c9de560dSAlex Tomas 3893c9de560dSAlex Tomas /* if we still need more blocks and some PAs were used, try again */ 3894c9de560dSAlex Tomas if (free < needed && busy) { 3895c9de560dSAlex Tomas busy = 0; 3896c9de560dSAlex Tomas ext4_unlock_group(sb, group); 3897bb8b20edSLukas Czerner cond_resched(); 3898c9de560dSAlex Tomas goto repeat; 3899c9de560dSAlex Tomas } 3900c9de560dSAlex Tomas 3901c9de560dSAlex Tomas /* found anything to free? */ 3902c9de560dSAlex Tomas if (list_empty(&list)) { 3903c9de560dSAlex Tomas BUG_ON(free != 0); 3904c9de560dSAlex Tomas goto out; 3905c9de560dSAlex Tomas } 3906c9de560dSAlex Tomas 3907c9de560dSAlex Tomas /* now free all selected PAs */ 3908c9de560dSAlex Tomas list_for_each_entry_safe(pa, tmp, &list, u.pa_tmp_list) { 3909c9de560dSAlex Tomas 3910c9de560dSAlex Tomas /* remove from object (inode or locality group) */ 3911c9de560dSAlex Tomas spin_lock(pa->pa_obj_lock); 3912c9de560dSAlex Tomas list_del_rcu(&pa->pa_inode_list); 3913c9de560dSAlex Tomas spin_unlock(pa->pa_obj_lock); 3914c9de560dSAlex Tomas 3915cc0fb9adSAneesh Kumar K.V if (pa->pa_type == MB_GROUP_PA) 39163e1e5f50SEric Sandeen ext4_mb_release_group_pa(&e4b, pa); 3917c9de560dSAlex Tomas else 39183e1e5f50SEric Sandeen ext4_mb_release_inode_pa(&e4b, bitmap_bh, pa); 3919c9de560dSAlex Tomas 3920c9de560dSAlex Tomas list_del(&pa->u.pa_tmp_list); 3921c9de560dSAlex Tomas call_rcu(&(pa)->u.pa_rcu, ext4_mb_pa_callback); 3922c9de560dSAlex Tomas } 3923c9de560dSAlex Tomas 3924c9de560dSAlex Tomas out: 3925c9de560dSAlex Tomas ext4_unlock_group(sb, group); 3926e39e07fdSJing Zhang ext4_mb_unload_buddy(&e4b); 3927c9de560dSAlex Tomas put_bh(bitmap_bh); 3928c9de560dSAlex Tomas return free; 3929c9de560dSAlex Tomas } 3930c9de560dSAlex Tomas 3931c9de560dSAlex Tomas /* 3932c9de560dSAlex Tomas * releases all non-used preallocated blocks for given inode 3933c9de560dSAlex Tomas * 3934c9de560dSAlex Tomas * It's important to discard preallocations under i_data_sem 3935c9de560dSAlex Tomas * We don't want another block to be served from the prealloc 3936c9de560dSAlex Tomas * space when we are discarding the inode prealloc space. 3937c9de560dSAlex Tomas * 3938c9de560dSAlex Tomas * FIXME!! Make sure it is valid at all the call sites 3939c9de560dSAlex Tomas */ 3940c2ea3fdeSTheodore Ts'o void ext4_discard_preallocations(struct inode *inode) 3941c9de560dSAlex Tomas { 3942c9de560dSAlex Tomas struct ext4_inode_info *ei = EXT4_I(inode); 3943c9de560dSAlex Tomas struct super_block *sb = inode->i_sb; 3944c9de560dSAlex Tomas struct buffer_head *bitmap_bh = NULL; 3945c9de560dSAlex Tomas struct ext4_prealloc_space *pa, *tmp; 3946c9de560dSAlex Tomas ext4_group_t group = 0; 3947c9de560dSAlex Tomas struct list_head list; 3948c9de560dSAlex Tomas struct ext4_buddy e4b; 3949c9de560dSAlex Tomas int err; 3950c9de560dSAlex Tomas 3951c2ea3fdeSTheodore Ts'o if (!S_ISREG(inode->i_mode)) { 3952c9de560dSAlex Tomas /*BUG_ON(!list_empty(&ei->i_prealloc_list));*/ 3953c9de560dSAlex Tomas return; 3954c9de560dSAlex Tomas } 3955c9de560dSAlex Tomas 39566ba495e9STheodore Ts'o mb_debug(1, "discard preallocation for inode %lu\n", inode->i_ino); 39579bffad1eSTheodore Ts'o trace_ext4_discard_preallocations(inode); 3958c9de560dSAlex Tomas 3959c9de560dSAlex Tomas INIT_LIST_HEAD(&list); 3960c9de560dSAlex Tomas 3961c9de560dSAlex Tomas repeat: 3962c9de560dSAlex Tomas /* first, collect all pa's in the inode */ 3963c9de560dSAlex Tomas spin_lock(&ei->i_prealloc_lock); 3964c9de560dSAlex Tomas while (!list_empty(&ei->i_prealloc_list)) { 3965c9de560dSAlex Tomas pa = list_entry(ei->i_prealloc_list.next, 3966c9de560dSAlex Tomas struct ext4_prealloc_space, pa_inode_list); 3967c9de560dSAlex Tomas BUG_ON(pa->pa_obj_lock != &ei->i_prealloc_lock); 3968c9de560dSAlex Tomas spin_lock(&pa->pa_lock); 3969c9de560dSAlex Tomas if (atomic_read(&pa->pa_count)) { 3970c9de560dSAlex Tomas /* this shouldn't happen often - nobody should 3971c9de560dSAlex Tomas * use preallocation while we're discarding it */ 3972c9de560dSAlex Tomas spin_unlock(&pa->pa_lock); 3973c9de560dSAlex Tomas spin_unlock(&ei->i_prealloc_lock); 39749d8b9ec4STheodore Ts'o ext4_msg(sb, KERN_ERR, 39759d8b9ec4STheodore Ts'o "uh-oh! used pa while discarding"); 3976c9de560dSAlex Tomas WARN_ON(1); 3977c9de560dSAlex Tomas schedule_timeout_uninterruptible(HZ); 3978c9de560dSAlex Tomas goto repeat; 3979c9de560dSAlex Tomas 3980c9de560dSAlex Tomas } 3981c9de560dSAlex Tomas if (pa->pa_deleted == 0) { 3982c9de560dSAlex Tomas pa->pa_deleted = 1; 3983c9de560dSAlex Tomas spin_unlock(&pa->pa_lock); 3984c9de560dSAlex Tomas list_del_rcu(&pa->pa_inode_list); 3985c9de560dSAlex Tomas list_add(&pa->u.pa_tmp_list, &list); 3986c9de560dSAlex Tomas continue; 3987c9de560dSAlex Tomas } 3988c9de560dSAlex Tomas 3989c9de560dSAlex Tomas /* someone is deleting pa right now */ 3990c9de560dSAlex Tomas spin_unlock(&pa->pa_lock); 3991c9de560dSAlex Tomas spin_unlock(&ei->i_prealloc_lock); 3992c9de560dSAlex Tomas 3993c9de560dSAlex Tomas /* we have to wait here because pa_deleted 3994c9de560dSAlex Tomas * doesn't mean pa is already unlinked from 3995c9de560dSAlex Tomas * the list. as we might be called from 3996c9de560dSAlex Tomas * ->clear_inode() the inode will get freed 3997c9de560dSAlex Tomas * and concurrent thread which is unlinking 3998c9de560dSAlex Tomas * pa from inode's list may access already 3999c9de560dSAlex Tomas * freed memory, bad-bad-bad */ 4000c9de560dSAlex Tomas 4001c9de560dSAlex Tomas /* XXX: if this happens too often, we can 4002c9de560dSAlex Tomas * add a flag to force wait only in case 4003c9de560dSAlex Tomas * of ->clear_inode(), but not in case of 4004c9de560dSAlex Tomas * regular truncate */ 4005c9de560dSAlex Tomas schedule_timeout_uninterruptible(HZ); 4006c9de560dSAlex Tomas goto repeat; 4007c9de560dSAlex Tomas } 4008c9de560dSAlex Tomas spin_unlock(&ei->i_prealloc_lock); 4009c9de560dSAlex Tomas 4010c9de560dSAlex Tomas list_for_each_entry_safe(pa, tmp, &list, u.pa_tmp_list) { 4011cc0fb9adSAneesh Kumar K.V BUG_ON(pa->pa_type != MB_INODE_PA); 4012bd86298eSLukas Czerner group = ext4_get_group_number(sb, pa->pa_pstart); 4013c9de560dSAlex Tomas 4014c9de560dSAlex Tomas err = ext4_mb_load_buddy(sb, group, &e4b); 4015ce89f46cSAneesh Kumar K.V if (err) { 401612062dddSEric Sandeen ext4_error(sb, "Error loading buddy information for %u", 401712062dddSEric Sandeen group); 4018ce89f46cSAneesh Kumar K.V continue; 4019ce89f46cSAneesh Kumar K.V } 4020c9de560dSAlex Tomas 4021574ca174STheodore Ts'o bitmap_bh = ext4_read_block_bitmap(sb, group); 40229008a58eSDarrick J. Wong if (IS_ERR(bitmap_bh)) { 40239008a58eSDarrick J. Wong err = PTR_ERR(bitmap_bh); 40249008a58eSDarrick J. Wong ext4_error(sb, "Error %d reading block bitmap for %u", 40259008a58eSDarrick J. Wong err, group); 4026e39e07fdSJing Zhang ext4_mb_unload_buddy(&e4b); 4027ce89f46cSAneesh Kumar K.V continue; 4028c9de560dSAlex Tomas } 4029c9de560dSAlex Tomas 4030c9de560dSAlex Tomas ext4_lock_group(sb, group); 4031c9de560dSAlex Tomas list_del(&pa->pa_group_list); 40323e1e5f50SEric Sandeen ext4_mb_release_inode_pa(&e4b, bitmap_bh, pa); 4033c9de560dSAlex Tomas ext4_unlock_group(sb, group); 4034c9de560dSAlex Tomas 4035e39e07fdSJing Zhang ext4_mb_unload_buddy(&e4b); 4036c9de560dSAlex Tomas put_bh(bitmap_bh); 4037c9de560dSAlex Tomas 4038c9de560dSAlex Tomas list_del(&pa->u.pa_tmp_list); 4039c9de560dSAlex Tomas call_rcu(&(pa)->u.pa_rcu, ext4_mb_pa_callback); 4040c9de560dSAlex Tomas } 4041c9de560dSAlex Tomas } 4042c9de560dSAlex Tomas 40436ba495e9STheodore Ts'o #ifdef CONFIG_EXT4_DEBUG 4044c9de560dSAlex Tomas static void ext4_mb_show_ac(struct ext4_allocation_context *ac) 4045c9de560dSAlex Tomas { 4046c9de560dSAlex Tomas struct super_block *sb = ac->ac_sb; 40478df9675fSTheodore Ts'o ext4_group_t ngroups, i; 4048c9de560dSAlex Tomas 4049a0b30c12STheodore Ts'o if (!ext4_mballoc_debug || 40504dd89fc6STheodore Ts'o (EXT4_SB(sb)->s_mount_flags & EXT4_MF_FS_ABORTED)) 4051e3570639SEric Sandeen return; 4052e3570639SEric Sandeen 40537f6a11e7SJoe Perches ext4_msg(ac->ac_sb, KERN_ERR, "Can't allocate:" 40549d8b9ec4STheodore Ts'o " Allocation context details:"); 40557f6a11e7SJoe Perches ext4_msg(ac->ac_sb, KERN_ERR, "status %d flags %d", 4056c9de560dSAlex Tomas ac->ac_status, ac->ac_flags); 40577f6a11e7SJoe Perches ext4_msg(ac->ac_sb, KERN_ERR, "orig %lu/%lu/%lu@%lu, " 40589d8b9ec4STheodore Ts'o "goal %lu/%lu/%lu@%lu, " 40599d8b9ec4STheodore Ts'o "best %lu/%lu/%lu@%lu cr %d", 4060c9de560dSAlex Tomas (unsigned long)ac->ac_o_ex.fe_group, 4061c9de560dSAlex Tomas (unsigned long)ac->ac_o_ex.fe_start, 4062c9de560dSAlex Tomas (unsigned long)ac->ac_o_ex.fe_len, 4063c9de560dSAlex Tomas (unsigned long)ac->ac_o_ex.fe_logical, 4064c9de560dSAlex Tomas (unsigned long)ac->ac_g_ex.fe_group, 4065c9de560dSAlex Tomas (unsigned long)ac->ac_g_ex.fe_start, 4066c9de560dSAlex Tomas (unsigned long)ac->ac_g_ex.fe_len, 4067c9de560dSAlex Tomas (unsigned long)ac->ac_g_ex.fe_logical, 4068c9de560dSAlex Tomas (unsigned long)ac->ac_b_ex.fe_group, 4069c9de560dSAlex Tomas (unsigned long)ac->ac_b_ex.fe_start, 4070c9de560dSAlex Tomas (unsigned long)ac->ac_b_ex.fe_len, 4071c9de560dSAlex Tomas (unsigned long)ac->ac_b_ex.fe_logical, 4072c9de560dSAlex Tomas (int)ac->ac_criteria); 4073dc9ddd98SEric Sandeen ext4_msg(ac->ac_sb, KERN_ERR, "%d found", ac->ac_found); 40747f6a11e7SJoe Perches ext4_msg(ac->ac_sb, KERN_ERR, "groups: "); 40758df9675fSTheodore Ts'o ngroups = ext4_get_groups_count(sb); 40768df9675fSTheodore Ts'o for (i = 0; i < ngroups; i++) { 4077c9de560dSAlex Tomas struct ext4_group_info *grp = ext4_get_group_info(sb, i); 4078c9de560dSAlex Tomas struct ext4_prealloc_space *pa; 4079c9de560dSAlex Tomas ext4_grpblk_t start; 4080c9de560dSAlex Tomas struct list_head *cur; 4081c9de560dSAlex Tomas ext4_lock_group(sb, i); 4082c9de560dSAlex Tomas list_for_each(cur, &grp->bb_prealloc_list) { 4083c9de560dSAlex Tomas pa = list_entry(cur, struct ext4_prealloc_space, 4084c9de560dSAlex Tomas pa_group_list); 4085c9de560dSAlex Tomas spin_lock(&pa->pa_lock); 4086c9de560dSAlex Tomas ext4_get_group_no_and_offset(sb, pa->pa_pstart, 4087c9de560dSAlex Tomas NULL, &start); 4088c9de560dSAlex Tomas spin_unlock(&pa->pa_lock); 40891c718505SAkira Fujita printk(KERN_ERR "PA:%u:%d:%u \n", i, 4090c9de560dSAlex Tomas start, pa->pa_len); 4091c9de560dSAlex Tomas } 409260bd63d1SSolofo Ramangalahy ext4_unlock_group(sb, i); 4093c9de560dSAlex Tomas 4094c9de560dSAlex Tomas if (grp->bb_free == 0) 4095c9de560dSAlex Tomas continue; 40961c718505SAkira Fujita printk(KERN_ERR "%u: %d/%d \n", 4097c9de560dSAlex Tomas i, grp->bb_free, grp->bb_fragments); 4098c9de560dSAlex Tomas } 4099c9de560dSAlex Tomas printk(KERN_ERR "\n"); 4100c9de560dSAlex Tomas } 4101c9de560dSAlex Tomas #else 4102c9de560dSAlex Tomas static inline void ext4_mb_show_ac(struct ext4_allocation_context *ac) 4103c9de560dSAlex Tomas { 4104c9de560dSAlex Tomas return; 4105c9de560dSAlex Tomas } 4106c9de560dSAlex Tomas #endif 4107c9de560dSAlex Tomas 4108c9de560dSAlex Tomas /* 4109c9de560dSAlex Tomas * We use locality group preallocation for small size file. The size of the 4110c9de560dSAlex Tomas * file is determined by the current size or the resulting size after 4111c9de560dSAlex Tomas * allocation which ever is larger 4112c9de560dSAlex Tomas * 4113b713a5ecSTheodore Ts'o * One can tune this size via /sys/fs/ext4/<partition>/mb_stream_req 4114c9de560dSAlex Tomas */ 4115c9de560dSAlex Tomas static void ext4_mb_group_or_file(struct ext4_allocation_context *ac) 4116c9de560dSAlex Tomas { 4117c9de560dSAlex Tomas struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); 4118c9de560dSAlex Tomas int bsbits = ac->ac_sb->s_blocksize_bits; 4119c9de560dSAlex Tomas loff_t size, isize; 4120c9de560dSAlex Tomas 4121c9de560dSAlex Tomas if (!(ac->ac_flags & EXT4_MB_HINT_DATA)) 4122c9de560dSAlex Tomas return; 4123c9de560dSAlex Tomas 41244ba74d00STheodore Ts'o if (unlikely(ac->ac_flags & EXT4_MB_HINT_GOAL_ONLY)) 41254ba74d00STheodore Ts'o return; 41264ba74d00STheodore Ts'o 412753accfa9STheodore Ts'o size = ac->ac_o_ex.fe_logical + EXT4_C2B(sbi, ac->ac_o_ex.fe_len); 412850797481STheodore Ts'o isize = (i_size_read(ac->ac_inode) + ac->ac_sb->s_blocksize - 1) 412950797481STheodore Ts'o >> bsbits; 4130c9de560dSAlex Tomas 413150797481STheodore Ts'o if ((size == isize) && 413250797481STheodore Ts'o !ext4_fs_is_busy(sbi) && 413350797481STheodore Ts'o (atomic_read(&ac->ac_inode->i_writecount) == 0)) { 413450797481STheodore Ts'o ac->ac_flags |= EXT4_MB_HINT_NOPREALLOC; 413550797481STheodore Ts'o return; 413650797481STheodore Ts'o } 413750797481STheodore Ts'o 4138ebbe0277SRobin Dong if (sbi->s_mb_group_prealloc <= 0) { 4139ebbe0277SRobin Dong ac->ac_flags |= EXT4_MB_STREAM_ALLOC; 4140ebbe0277SRobin Dong return; 4141ebbe0277SRobin Dong } 4142ebbe0277SRobin Dong 4143c9de560dSAlex Tomas /* don't use group allocation for large files */ 414471780577STheodore Ts'o size = max(size, isize); 4145cc483f10STao Ma if (size > sbi->s_mb_stream_request) { 41464ba74d00STheodore Ts'o ac->ac_flags |= EXT4_MB_STREAM_ALLOC; 4147c9de560dSAlex Tomas return; 41484ba74d00STheodore Ts'o } 4149c9de560dSAlex Tomas 4150c9de560dSAlex Tomas BUG_ON(ac->ac_lg != NULL); 4151c9de560dSAlex Tomas /* 4152c9de560dSAlex Tomas * locality group prealloc space are per cpu. The reason for having 4153c9de560dSAlex Tomas * per cpu locality group is to reduce the contention between block 4154c9de560dSAlex Tomas * request from multiple CPUs. 4155c9de560dSAlex Tomas */ 4156a0b6bc63SChristoph Lameter ac->ac_lg = raw_cpu_ptr(sbi->s_locality_groups); 4157c9de560dSAlex Tomas 4158c9de560dSAlex Tomas /* we're going to use group allocation */ 4159c9de560dSAlex Tomas ac->ac_flags |= EXT4_MB_HINT_GROUP_ALLOC; 4160c9de560dSAlex Tomas 4161c9de560dSAlex Tomas /* serialize all allocations in the group */ 4162c9de560dSAlex Tomas mutex_lock(&ac->ac_lg->lg_mutex); 4163c9de560dSAlex Tomas } 4164c9de560dSAlex Tomas 41654ddfef7bSEric Sandeen static noinline_for_stack int 41664ddfef7bSEric Sandeen ext4_mb_initialize_context(struct ext4_allocation_context *ac, 4167c9de560dSAlex Tomas struct ext4_allocation_request *ar) 4168c9de560dSAlex Tomas { 4169c9de560dSAlex Tomas struct super_block *sb = ar->inode->i_sb; 4170c9de560dSAlex Tomas struct ext4_sb_info *sbi = EXT4_SB(sb); 4171c9de560dSAlex Tomas struct ext4_super_block *es = sbi->s_es; 4172c9de560dSAlex Tomas ext4_group_t group; 4173498e5f24STheodore Ts'o unsigned int len; 4174498e5f24STheodore Ts'o ext4_fsblk_t goal; 4175c9de560dSAlex Tomas ext4_grpblk_t block; 4176c9de560dSAlex Tomas 4177c9de560dSAlex Tomas /* we can't allocate > group size */ 4178c9de560dSAlex Tomas len = ar->len; 4179c9de560dSAlex Tomas 4180c9de560dSAlex Tomas /* just a dirty hack to filter too big requests */ 418140ae3487STheodore Ts'o if (len >= EXT4_CLUSTERS_PER_GROUP(sb)) 418240ae3487STheodore Ts'o len = EXT4_CLUSTERS_PER_GROUP(sb); 4183c9de560dSAlex Tomas 4184c9de560dSAlex Tomas /* start searching from the goal */ 4185c9de560dSAlex Tomas goal = ar->goal; 4186c9de560dSAlex Tomas if (goal < le32_to_cpu(es->s_first_data_block) || 4187c9de560dSAlex Tomas goal >= ext4_blocks_count(es)) 4188c9de560dSAlex Tomas goal = le32_to_cpu(es->s_first_data_block); 4189c9de560dSAlex Tomas ext4_get_group_no_and_offset(sb, goal, &group, &block); 4190c9de560dSAlex Tomas 4191c9de560dSAlex Tomas /* set up allocation goals */ 4192f5a44db5STheodore Ts'o ac->ac_b_ex.fe_logical = EXT4_LBLK_CMASK(sbi, ar->logical); 4193c9de560dSAlex Tomas ac->ac_status = AC_STATUS_CONTINUE; 4194c9de560dSAlex Tomas ac->ac_sb = sb; 4195c9de560dSAlex Tomas ac->ac_inode = ar->inode; 419653accfa9STheodore Ts'o ac->ac_o_ex.fe_logical = ac->ac_b_ex.fe_logical; 4197c9de560dSAlex Tomas ac->ac_o_ex.fe_group = group; 4198c9de560dSAlex Tomas ac->ac_o_ex.fe_start = block; 4199c9de560dSAlex Tomas ac->ac_o_ex.fe_len = len; 420053accfa9STheodore Ts'o ac->ac_g_ex = ac->ac_o_ex; 4201c9de560dSAlex Tomas ac->ac_flags = ar->flags; 4202c9de560dSAlex Tomas 4203c9de560dSAlex Tomas /* we have to define context: we'll we work with a file or 4204c9de560dSAlex Tomas * locality group. this is a policy, actually */ 4205c9de560dSAlex Tomas ext4_mb_group_or_file(ac); 4206c9de560dSAlex Tomas 42076ba495e9STheodore Ts'o mb_debug(1, "init ac: %u blocks @ %u, goal %u, flags %x, 2^%d, " 4208c9de560dSAlex Tomas "left: %u/%u, right %u/%u to %swritable\n", 4209c9de560dSAlex Tomas (unsigned) ar->len, (unsigned) ar->logical, 4210c9de560dSAlex Tomas (unsigned) ar->goal, ac->ac_flags, ac->ac_2order, 4211c9de560dSAlex Tomas (unsigned) ar->lleft, (unsigned) ar->pleft, 4212c9de560dSAlex Tomas (unsigned) ar->lright, (unsigned) ar->pright, 4213c9de560dSAlex Tomas atomic_read(&ar->inode->i_writecount) ? "" : "non-"); 4214c9de560dSAlex Tomas return 0; 4215c9de560dSAlex Tomas 4216c9de560dSAlex Tomas } 4217c9de560dSAlex Tomas 42186be2ded1SAneesh Kumar K.V static noinline_for_stack void 42196be2ded1SAneesh Kumar K.V ext4_mb_discard_lg_preallocations(struct super_block *sb, 42206be2ded1SAneesh Kumar K.V struct ext4_locality_group *lg, 42216be2ded1SAneesh Kumar K.V int order, int total_entries) 42226be2ded1SAneesh Kumar K.V { 42236be2ded1SAneesh Kumar K.V ext4_group_t group = 0; 42246be2ded1SAneesh Kumar K.V struct ext4_buddy e4b; 42256be2ded1SAneesh Kumar K.V struct list_head discard_list; 42266be2ded1SAneesh Kumar K.V struct ext4_prealloc_space *pa, *tmp; 42276be2ded1SAneesh Kumar K.V 42286ba495e9STheodore Ts'o mb_debug(1, "discard locality group preallocation\n"); 42296be2ded1SAneesh Kumar K.V 42306be2ded1SAneesh Kumar K.V INIT_LIST_HEAD(&discard_list); 42316be2ded1SAneesh Kumar K.V 42326be2ded1SAneesh Kumar K.V spin_lock(&lg->lg_prealloc_lock); 42336be2ded1SAneesh Kumar K.V list_for_each_entry_rcu(pa, &lg->lg_prealloc_list[order], 42346be2ded1SAneesh Kumar K.V pa_inode_list) { 42356be2ded1SAneesh Kumar K.V spin_lock(&pa->pa_lock); 42366be2ded1SAneesh Kumar K.V if (atomic_read(&pa->pa_count)) { 42376be2ded1SAneesh Kumar K.V /* 42386be2ded1SAneesh Kumar K.V * This is the pa that we just used 42396be2ded1SAneesh Kumar K.V * for block allocation. So don't 42406be2ded1SAneesh Kumar K.V * free that 42416be2ded1SAneesh Kumar K.V */ 42426be2ded1SAneesh Kumar K.V spin_unlock(&pa->pa_lock); 42436be2ded1SAneesh Kumar K.V continue; 42446be2ded1SAneesh Kumar K.V } 42456be2ded1SAneesh Kumar K.V if (pa->pa_deleted) { 42466be2ded1SAneesh Kumar K.V spin_unlock(&pa->pa_lock); 42476be2ded1SAneesh Kumar K.V continue; 42486be2ded1SAneesh Kumar K.V } 42496be2ded1SAneesh Kumar K.V /* only lg prealloc space */ 4250cc0fb9adSAneesh Kumar K.V BUG_ON(pa->pa_type != MB_GROUP_PA); 42516be2ded1SAneesh Kumar K.V 42526be2ded1SAneesh Kumar K.V /* seems this one can be freed ... */ 42536be2ded1SAneesh Kumar K.V pa->pa_deleted = 1; 42546be2ded1SAneesh Kumar K.V spin_unlock(&pa->pa_lock); 42556be2ded1SAneesh Kumar K.V 42566be2ded1SAneesh Kumar K.V list_del_rcu(&pa->pa_inode_list); 42576be2ded1SAneesh Kumar K.V list_add(&pa->u.pa_tmp_list, &discard_list); 42586be2ded1SAneesh Kumar K.V 42596be2ded1SAneesh Kumar K.V total_entries--; 42606be2ded1SAneesh Kumar K.V if (total_entries <= 5) { 42616be2ded1SAneesh Kumar K.V /* 42626be2ded1SAneesh Kumar K.V * we want to keep only 5 entries 42636be2ded1SAneesh Kumar K.V * allowing it to grow to 8. This 42646be2ded1SAneesh Kumar K.V * mak sure we don't call discard 42656be2ded1SAneesh Kumar K.V * soon for this list. 42666be2ded1SAneesh Kumar K.V */ 42676be2ded1SAneesh Kumar K.V break; 42686be2ded1SAneesh Kumar K.V } 42696be2ded1SAneesh Kumar K.V } 42706be2ded1SAneesh Kumar K.V spin_unlock(&lg->lg_prealloc_lock); 42716be2ded1SAneesh Kumar K.V 42726be2ded1SAneesh Kumar K.V list_for_each_entry_safe(pa, tmp, &discard_list, u.pa_tmp_list) { 42736be2ded1SAneesh Kumar K.V 4274bd86298eSLukas Czerner group = ext4_get_group_number(sb, pa->pa_pstart); 42756be2ded1SAneesh Kumar K.V if (ext4_mb_load_buddy(sb, group, &e4b)) { 427612062dddSEric Sandeen ext4_error(sb, "Error loading buddy information for %u", 427712062dddSEric Sandeen group); 42786be2ded1SAneesh Kumar K.V continue; 42796be2ded1SAneesh Kumar K.V } 42806be2ded1SAneesh Kumar K.V ext4_lock_group(sb, group); 42816be2ded1SAneesh Kumar K.V list_del(&pa->pa_group_list); 42823e1e5f50SEric Sandeen ext4_mb_release_group_pa(&e4b, pa); 42836be2ded1SAneesh Kumar K.V ext4_unlock_group(sb, group); 42846be2ded1SAneesh Kumar K.V 4285e39e07fdSJing Zhang ext4_mb_unload_buddy(&e4b); 42866be2ded1SAneesh Kumar K.V list_del(&pa->u.pa_tmp_list); 42876be2ded1SAneesh Kumar K.V call_rcu(&(pa)->u.pa_rcu, ext4_mb_pa_callback); 42886be2ded1SAneesh Kumar K.V } 42896be2ded1SAneesh Kumar K.V } 42906be2ded1SAneesh Kumar K.V 42916be2ded1SAneesh Kumar K.V /* 42926be2ded1SAneesh Kumar K.V * We have incremented pa_count. So it cannot be freed at this 42936be2ded1SAneesh Kumar K.V * point. Also we hold lg_mutex. So no parallel allocation is 42946be2ded1SAneesh Kumar K.V * possible from this lg. That means pa_free cannot be updated. 42956be2ded1SAneesh Kumar K.V * 42966be2ded1SAneesh Kumar K.V * A parallel ext4_mb_discard_group_preallocations is possible. 42976be2ded1SAneesh Kumar K.V * which can cause the lg_prealloc_list to be updated. 42986be2ded1SAneesh Kumar K.V */ 42996be2ded1SAneesh Kumar K.V 43006be2ded1SAneesh Kumar K.V static void ext4_mb_add_n_trim(struct ext4_allocation_context *ac) 43016be2ded1SAneesh Kumar K.V { 43026be2ded1SAneesh Kumar K.V int order, added = 0, lg_prealloc_count = 1; 43036be2ded1SAneesh Kumar K.V struct super_block *sb = ac->ac_sb; 43046be2ded1SAneesh Kumar K.V struct ext4_locality_group *lg = ac->ac_lg; 43056be2ded1SAneesh Kumar K.V struct ext4_prealloc_space *tmp_pa, *pa = ac->ac_pa; 43066be2ded1SAneesh Kumar K.V 43076be2ded1SAneesh Kumar K.V order = fls(pa->pa_free) - 1; 43086be2ded1SAneesh Kumar K.V if (order > PREALLOC_TB_SIZE - 1) 43096be2ded1SAneesh Kumar K.V /* The max size of hash table is PREALLOC_TB_SIZE */ 43106be2ded1SAneesh Kumar K.V order = PREALLOC_TB_SIZE - 1; 43116be2ded1SAneesh Kumar K.V /* Add the prealloc space to lg */ 4312f1167009SNiu Yawei spin_lock(&lg->lg_prealloc_lock); 43136be2ded1SAneesh Kumar K.V list_for_each_entry_rcu(tmp_pa, &lg->lg_prealloc_list[order], 43146be2ded1SAneesh Kumar K.V pa_inode_list) { 43156be2ded1SAneesh Kumar K.V spin_lock(&tmp_pa->pa_lock); 43166be2ded1SAneesh Kumar K.V if (tmp_pa->pa_deleted) { 4317e7c9e3e9STheodore Ts'o spin_unlock(&tmp_pa->pa_lock); 43186be2ded1SAneesh Kumar K.V continue; 43196be2ded1SAneesh Kumar K.V } 43206be2ded1SAneesh Kumar K.V if (!added && pa->pa_free < tmp_pa->pa_free) { 43216be2ded1SAneesh Kumar K.V /* Add to the tail of the previous entry */ 43226be2ded1SAneesh Kumar K.V list_add_tail_rcu(&pa->pa_inode_list, 43236be2ded1SAneesh Kumar K.V &tmp_pa->pa_inode_list); 43246be2ded1SAneesh Kumar K.V added = 1; 43256be2ded1SAneesh Kumar K.V /* 43266be2ded1SAneesh Kumar K.V * we want to count the total 43276be2ded1SAneesh Kumar K.V * number of entries in the list 43286be2ded1SAneesh Kumar K.V */ 43296be2ded1SAneesh Kumar K.V } 43306be2ded1SAneesh Kumar K.V spin_unlock(&tmp_pa->pa_lock); 43316be2ded1SAneesh Kumar K.V lg_prealloc_count++; 43326be2ded1SAneesh Kumar K.V } 43336be2ded1SAneesh Kumar K.V if (!added) 43346be2ded1SAneesh Kumar K.V list_add_tail_rcu(&pa->pa_inode_list, 43356be2ded1SAneesh Kumar K.V &lg->lg_prealloc_list[order]); 4336f1167009SNiu Yawei spin_unlock(&lg->lg_prealloc_lock); 43376be2ded1SAneesh Kumar K.V 43386be2ded1SAneesh Kumar K.V /* Now trim the list to be not more than 8 elements */ 43396be2ded1SAneesh Kumar K.V if (lg_prealloc_count > 8) { 43406be2ded1SAneesh Kumar K.V ext4_mb_discard_lg_preallocations(sb, lg, 43416be2ded1SAneesh Kumar K.V order, lg_prealloc_count); 43426be2ded1SAneesh Kumar K.V return; 43436be2ded1SAneesh Kumar K.V } 43446be2ded1SAneesh Kumar K.V return ; 43456be2ded1SAneesh Kumar K.V } 43466be2ded1SAneesh Kumar K.V 4347c9de560dSAlex Tomas /* 4348c9de560dSAlex Tomas * release all resource we used in allocation 4349c9de560dSAlex Tomas */ 4350c9de560dSAlex Tomas static int ext4_mb_release_context(struct ext4_allocation_context *ac) 4351c9de560dSAlex Tomas { 435253accfa9STheodore Ts'o struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); 43536be2ded1SAneesh Kumar K.V struct ext4_prealloc_space *pa = ac->ac_pa; 43546be2ded1SAneesh Kumar K.V if (pa) { 4355cc0fb9adSAneesh Kumar K.V if (pa->pa_type == MB_GROUP_PA) { 4356c9de560dSAlex Tomas /* see comment in ext4_mb_use_group_pa() */ 43576be2ded1SAneesh Kumar K.V spin_lock(&pa->pa_lock); 435853accfa9STheodore Ts'o pa->pa_pstart += EXT4_C2B(sbi, ac->ac_b_ex.fe_len); 435953accfa9STheodore Ts'o pa->pa_lstart += EXT4_C2B(sbi, ac->ac_b_ex.fe_len); 43606be2ded1SAneesh Kumar K.V pa->pa_free -= ac->ac_b_ex.fe_len; 43616be2ded1SAneesh Kumar K.V pa->pa_len -= ac->ac_b_ex.fe_len; 43626be2ded1SAneesh Kumar K.V spin_unlock(&pa->pa_lock); 4363ba443916SAneesh Kumar K.V } 4364ba443916SAneesh Kumar K.V } 4365ba443916SAneesh Kumar K.V if (pa) { 43666be2ded1SAneesh Kumar K.V /* 43676be2ded1SAneesh Kumar K.V * We want to add the pa to the right bucket. 43686be2ded1SAneesh Kumar K.V * Remove it from the list and while adding 43696be2ded1SAneesh Kumar K.V * make sure the list to which we are adding 437044183d42SAmir Goldstein * doesn't grow big. 43716be2ded1SAneesh Kumar K.V */ 4372cc0fb9adSAneesh Kumar K.V if ((pa->pa_type == MB_GROUP_PA) && likely(pa->pa_free)) { 43736be2ded1SAneesh Kumar K.V spin_lock(pa->pa_obj_lock); 43746be2ded1SAneesh Kumar K.V list_del_rcu(&pa->pa_inode_list); 43756be2ded1SAneesh Kumar K.V spin_unlock(pa->pa_obj_lock); 43766be2ded1SAneesh Kumar K.V ext4_mb_add_n_trim(ac); 4377c9de560dSAlex Tomas } 43786be2ded1SAneesh Kumar K.V ext4_mb_put_pa(ac, ac->ac_sb, pa); 4379c9de560dSAlex Tomas } 4380c9de560dSAlex Tomas if (ac->ac_bitmap_page) 4381c9de560dSAlex Tomas page_cache_release(ac->ac_bitmap_page); 4382c9de560dSAlex Tomas if (ac->ac_buddy_page) 4383c9de560dSAlex Tomas page_cache_release(ac->ac_buddy_page); 4384c9de560dSAlex Tomas if (ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC) 4385c9de560dSAlex Tomas mutex_unlock(&ac->ac_lg->lg_mutex); 4386c9de560dSAlex Tomas ext4_mb_collect_stats(ac); 4387c9de560dSAlex Tomas return 0; 4388c9de560dSAlex Tomas } 4389c9de560dSAlex Tomas 4390c9de560dSAlex Tomas static int ext4_mb_discard_preallocations(struct super_block *sb, int needed) 4391c9de560dSAlex Tomas { 43928df9675fSTheodore Ts'o ext4_group_t i, ngroups = ext4_get_groups_count(sb); 4393c9de560dSAlex Tomas int ret; 4394c9de560dSAlex Tomas int freed = 0; 4395c9de560dSAlex Tomas 43969bffad1eSTheodore Ts'o trace_ext4_mb_discard_preallocations(sb, needed); 43978df9675fSTheodore Ts'o for (i = 0; i < ngroups && needed > 0; i++) { 4398c9de560dSAlex Tomas ret = ext4_mb_discard_group_preallocations(sb, i, needed); 4399c9de560dSAlex Tomas freed += ret; 4400c9de560dSAlex Tomas needed -= ret; 4401c9de560dSAlex Tomas } 4402c9de560dSAlex Tomas 4403c9de560dSAlex Tomas return freed; 4404c9de560dSAlex Tomas } 4405c9de560dSAlex Tomas 4406c9de560dSAlex Tomas /* 4407c9de560dSAlex Tomas * Main entry point into mballoc to allocate blocks 4408c9de560dSAlex Tomas * it tries to use preallocation first, then falls back 4409c9de560dSAlex Tomas * to usual allocation 4410c9de560dSAlex Tomas */ 4411c9de560dSAlex Tomas ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle, 4412c9de560dSAlex Tomas struct ext4_allocation_request *ar, int *errp) 4413c9de560dSAlex Tomas { 44146bc6e63fSAneesh Kumar K.V int freed; 4415256bdb49SEric Sandeen struct ext4_allocation_context *ac = NULL; 4416c9de560dSAlex Tomas struct ext4_sb_info *sbi; 4417c9de560dSAlex Tomas struct super_block *sb; 4418c9de560dSAlex Tomas ext4_fsblk_t block = 0; 441960e58e0fSMingming Cao unsigned int inquota = 0; 442053accfa9STheodore Ts'o unsigned int reserv_clstrs = 0; 4421c9de560dSAlex Tomas 4422b10a44c3STheodore Ts'o might_sleep(); 4423c9de560dSAlex Tomas sb = ar->inode->i_sb; 4424c9de560dSAlex Tomas sbi = EXT4_SB(sb); 4425c9de560dSAlex Tomas 44269bffad1eSTheodore Ts'o trace_ext4_request_blocks(ar); 4427ba80b101STheodore Ts'o 442845dc63e7SDmitry Monakhov /* Allow to use superuser reservation for quota file */ 442945dc63e7SDmitry Monakhov if (IS_NOQUOTA(ar->inode)) 443045dc63e7SDmitry Monakhov ar->flags |= EXT4_MB_USE_ROOT_BLOCKS; 443145dc63e7SDmitry Monakhov 4432e3cf5d5dSTheodore Ts'o if ((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0) { 443360e58e0fSMingming Cao /* Without delayed allocation we need to verify 443460e58e0fSMingming Cao * there is enough free blocks to do block allocation 443560e58e0fSMingming Cao * and verify allocation doesn't exceed the quota limits. 4436d2a17637SMingming Cao */ 443755f020dbSAllison Henderson while (ar->len && 4438e7d5f315STheodore Ts'o ext4_claim_free_clusters(sbi, ar->len, ar->flags)) { 443955f020dbSAllison Henderson 4440030ba6bcSAneesh Kumar K.V /* let others to free the space */ 4441bb8b20edSLukas Czerner cond_resched(); 4442030ba6bcSAneesh Kumar K.V ar->len = ar->len >> 1; 4443030ba6bcSAneesh Kumar K.V } 4444030ba6bcSAneesh Kumar K.V if (!ar->len) { 444507031431SMingming Cao *errp = -ENOSPC; 444607031431SMingming Cao return 0; 444707031431SMingming Cao } 444853accfa9STheodore Ts'o reserv_clstrs = ar->len; 444955f020dbSAllison Henderson if (ar->flags & EXT4_MB_USE_ROOT_BLOCKS) { 445053accfa9STheodore Ts'o dquot_alloc_block_nofail(ar->inode, 445153accfa9STheodore Ts'o EXT4_C2B(sbi, ar->len)); 445255f020dbSAllison Henderson } else { 445355f020dbSAllison Henderson while (ar->len && 445453accfa9STheodore Ts'o dquot_alloc_block(ar->inode, 445553accfa9STheodore Ts'o EXT4_C2B(sbi, ar->len))) { 445655f020dbSAllison Henderson 4457c9de560dSAlex Tomas ar->flags |= EXT4_MB_HINT_NOPREALLOC; 4458c9de560dSAlex Tomas ar->len--; 4459c9de560dSAlex Tomas } 446055f020dbSAllison Henderson } 446160e58e0fSMingming Cao inquota = ar->len; 4462c9de560dSAlex Tomas if (ar->len == 0) { 4463c9de560dSAlex Tomas *errp = -EDQUOT; 44646c7a120aSAditya Kali goto out; 4465c9de560dSAlex Tomas } 446660e58e0fSMingming Cao } 4467d2a17637SMingming Cao 446885556c9aSWei Yongjun ac = kmem_cache_zalloc(ext4_ac_cachep, GFP_NOFS); 4469833576b3STheodore Ts'o if (!ac) { 4470363d4251SShen Feng ar->len = 0; 4471256bdb49SEric Sandeen *errp = -ENOMEM; 44726c7a120aSAditya Kali goto out; 4473256bdb49SEric Sandeen } 4474256bdb49SEric Sandeen 4475256bdb49SEric Sandeen *errp = ext4_mb_initialize_context(ac, ar); 4476c9de560dSAlex Tomas if (*errp) { 4477c9de560dSAlex Tomas ar->len = 0; 44786c7a120aSAditya Kali goto out; 4479c9de560dSAlex Tomas } 4480c9de560dSAlex Tomas 4481256bdb49SEric Sandeen ac->ac_op = EXT4_MB_HISTORY_PREALLOC; 4482256bdb49SEric Sandeen if (!ext4_mb_use_preallocated(ac)) { 4483256bdb49SEric Sandeen ac->ac_op = EXT4_MB_HISTORY_ALLOC; 4484256bdb49SEric Sandeen ext4_mb_normalize_request(ac, ar); 4485c9de560dSAlex Tomas repeat: 4486c9de560dSAlex Tomas /* allocate space in core */ 44876c7a120aSAditya Kali *errp = ext4_mb_regular_allocator(ac); 44882c00ef3eSAlexey Khoroshilov if (*errp) 44892c00ef3eSAlexey Khoroshilov goto discard_and_exit; 4490c9de560dSAlex Tomas 4491c9de560dSAlex Tomas /* as we've just preallocated more space than 44922c00ef3eSAlexey Khoroshilov * user requested originally, we store allocated 4493c9de560dSAlex Tomas * space in a special descriptor */ 4494256bdb49SEric Sandeen if (ac->ac_status == AC_STATUS_FOUND && 4495256bdb49SEric Sandeen ac->ac_o_ex.fe_len < ac->ac_b_ex.fe_len) 44962c00ef3eSAlexey Khoroshilov *errp = ext4_mb_new_preallocation(ac); 44972c00ef3eSAlexey Khoroshilov if (*errp) { 44982c00ef3eSAlexey Khoroshilov discard_and_exit: 44992c00ef3eSAlexey Khoroshilov ext4_discard_allocated_blocks(ac); 45002c00ef3eSAlexey Khoroshilov goto errout; 45012c00ef3eSAlexey Khoroshilov } 4502c9de560dSAlex Tomas } 4503256bdb49SEric Sandeen if (likely(ac->ac_status == AC_STATUS_FOUND)) { 450453accfa9STheodore Ts'o *errp = ext4_mb_mark_diskspace_used(ac, handle, reserv_clstrs); 4505519deca0SAneesh Kumar K.V if (*errp == -EAGAIN) { 45068556e8f3SAneesh Kumar K.V /* 45078556e8f3SAneesh Kumar K.V * drop the reference that we took 45088556e8f3SAneesh Kumar K.V * in ext4_mb_use_best_found 45098556e8f3SAneesh Kumar K.V */ 45108556e8f3SAneesh Kumar K.V ext4_mb_release_context(ac); 4511519deca0SAneesh Kumar K.V ac->ac_b_ex.fe_group = 0; 4512519deca0SAneesh Kumar K.V ac->ac_b_ex.fe_start = 0; 4513519deca0SAneesh Kumar K.V ac->ac_b_ex.fe_len = 0; 4514519deca0SAneesh Kumar K.V ac->ac_status = AC_STATUS_CONTINUE; 4515519deca0SAneesh Kumar K.V goto repeat; 45166d138cedSEric Sandeen } else if (*errp) { 4517b844167eSCurt Wohlgemuth ext4_discard_allocated_blocks(ac); 45186d138cedSEric Sandeen goto errout; 45196d138cedSEric Sandeen } else { 4520256bdb49SEric Sandeen block = ext4_grp_offs_to_block(sb, &ac->ac_b_ex); 4521256bdb49SEric Sandeen ar->len = ac->ac_b_ex.fe_len; 4522519deca0SAneesh Kumar K.V } 4523c9de560dSAlex Tomas } else { 4524256bdb49SEric Sandeen freed = ext4_mb_discard_preallocations(sb, ac->ac_o_ex.fe_len); 4525c9de560dSAlex Tomas if (freed) 4526c9de560dSAlex Tomas goto repeat; 4527c9de560dSAlex Tomas *errp = -ENOSPC; 45286c7a120aSAditya Kali } 45296c7a120aSAditya Kali 45306d138cedSEric Sandeen errout: 45316c7a120aSAditya Kali if (*errp) { 4532256bdb49SEric Sandeen ac->ac_b_ex.fe_len = 0; 4533c9de560dSAlex Tomas ar->len = 0; 4534256bdb49SEric Sandeen ext4_mb_show_ac(ac); 4535c9de560dSAlex Tomas } 4536256bdb49SEric Sandeen ext4_mb_release_context(ac); 45376c7a120aSAditya Kali out: 45386c7a120aSAditya Kali if (ac) 4539363d4251SShen Feng kmem_cache_free(ext4_ac_cachep, ac); 454060e58e0fSMingming Cao if (inquota && ar->len < inquota) 454153accfa9STheodore Ts'o dquot_free_block(ar->inode, EXT4_C2B(sbi, inquota - ar->len)); 45420087d9fbSAneesh Kumar K.V if (!ar->len) { 4543e3cf5d5dSTheodore Ts'o if ((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0) 45440087d9fbSAneesh Kumar K.V /* release all the reserved blocks if non delalloc */ 454557042651STheodore Ts'o percpu_counter_sub(&sbi->s_dirtyclusters_counter, 454653accfa9STheodore Ts'o reserv_clstrs); 45470087d9fbSAneesh Kumar K.V } 4548c9de560dSAlex Tomas 45499bffad1eSTheodore Ts'o trace_ext4_allocate_blocks(ar, (unsigned long long)block); 4550ba80b101STheodore Ts'o 4551c9de560dSAlex Tomas return block; 4552c9de560dSAlex Tomas } 4553c9de560dSAlex Tomas 4554c894058dSAneesh Kumar K.V /* 4555c894058dSAneesh Kumar K.V * We can merge two free data extents only if the physical blocks 4556c894058dSAneesh Kumar K.V * are contiguous, AND the extents were freed by the same transaction, 4557c894058dSAneesh Kumar K.V * AND the blocks are associated with the same group. 4558c894058dSAneesh Kumar K.V */ 4559c894058dSAneesh Kumar K.V static int can_merge(struct ext4_free_data *entry1, 4560c894058dSAneesh Kumar K.V struct ext4_free_data *entry2) 4561c894058dSAneesh Kumar K.V { 456218aadd47SBobi Jam if ((entry1->efd_tid == entry2->efd_tid) && 456318aadd47SBobi Jam (entry1->efd_group == entry2->efd_group) && 456418aadd47SBobi Jam ((entry1->efd_start_cluster + entry1->efd_count) == entry2->efd_start_cluster)) 4565c894058dSAneesh Kumar K.V return 1; 4566c894058dSAneesh Kumar K.V return 0; 4567c894058dSAneesh Kumar K.V } 4568c894058dSAneesh Kumar K.V 45694ddfef7bSEric Sandeen static noinline_for_stack int 45704ddfef7bSEric Sandeen ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b, 45717a2fcbf7SAneesh Kumar K.V struct ext4_free_data *new_entry) 4572c9de560dSAlex Tomas { 4573e29136f8STheodore Ts'o ext4_group_t group = e4b->bd_group; 457484130193STheodore Ts'o ext4_grpblk_t cluster; 45757a2fcbf7SAneesh Kumar K.V struct ext4_free_data *entry; 4576c9de560dSAlex Tomas struct ext4_group_info *db = e4b->bd_info; 4577c9de560dSAlex Tomas struct super_block *sb = e4b->bd_sb; 4578c9de560dSAlex Tomas struct ext4_sb_info *sbi = EXT4_SB(sb); 4579c894058dSAneesh Kumar K.V struct rb_node **n = &db->bb_free_root.rb_node, *node; 4580c894058dSAneesh Kumar K.V struct rb_node *parent = NULL, *new_node; 4581c894058dSAneesh Kumar K.V 45820390131bSFrank Mayhar BUG_ON(!ext4_handle_valid(handle)); 4583c9de560dSAlex Tomas BUG_ON(e4b->bd_bitmap_page == NULL); 4584c9de560dSAlex Tomas BUG_ON(e4b->bd_buddy_page == NULL); 4585c9de560dSAlex Tomas 458618aadd47SBobi Jam new_node = &new_entry->efd_node; 458718aadd47SBobi Jam cluster = new_entry->efd_start_cluster; 4588c9de560dSAlex Tomas 4589c894058dSAneesh Kumar K.V if (!*n) { 4590c894058dSAneesh Kumar K.V /* first free block exent. We need to 4591c894058dSAneesh Kumar K.V protect buddy cache from being freed, 4592c9de560dSAlex Tomas * otherwise we'll refresh it from 4593c9de560dSAlex Tomas * on-disk bitmap and lose not-yet-available 4594c9de560dSAlex Tomas * blocks */ 4595c9de560dSAlex Tomas page_cache_get(e4b->bd_buddy_page); 4596c9de560dSAlex Tomas page_cache_get(e4b->bd_bitmap_page); 4597c894058dSAneesh Kumar K.V } 4598c894058dSAneesh Kumar K.V while (*n) { 4599c894058dSAneesh Kumar K.V parent = *n; 460018aadd47SBobi Jam entry = rb_entry(parent, struct ext4_free_data, efd_node); 460118aadd47SBobi Jam if (cluster < entry->efd_start_cluster) 4602c894058dSAneesh Kumar K.V n = &(*n)->rb_left; 460318aadd47SBobi Jam else if (cluster >= (entry->efd_start_cluster + entry->efd_count)) 4604c894058dSAneesh Kumar K.V n = &(*n)->rb_right; 4605c894058dSAneesh Kumar K.V else { 4606e29136f8STheodore Ts'o ext4_grp_locked_error(sb, group, 0, 460784130193STheodore Ts'o ext4_group_first_block_no(sb, group) + 460884130193STheodore Ts'o EXT4_C2B(sbi, cluster), 4609e29136f8STheodore Ts'o "Block already on to-be-freed list"); 4610c894058dSAneesh Kumar K.V return 0; 4611c9de560dSAlex Tomas } 4612c9de560dSAlex Tomas } 4613c9de560dSAlex Tomas 4614c894058dSAneesh Kumar K.V rb_link_node(new_node, parent, n); 4615c894058dSAneesh Kumar K.V rb_insert_color(new_node, &db->bb_free_root); 4616c894058dSAneesh Kumar K.V 4617c894058dSAneesh Kumar K.V /* Now try to see the extent can be merged to left and right */ 4618c894058dSAneesh Kumar K.V node = rb_prev(new_node); 4619c894058dSAneesh Kumar K.V if (node) { 462018aadd47SBobi Jam entry = rb_entry(node, struct ext4_free_data, efd_node); 46215d3ee208SDmitry Monakhov if (can_merge(entry, new_entry) && 46225d3ee208SDmitry Monakhov ext4_journal_callback_try_del(handle, &entry->efd_jce)) { 462318aadd47SBobi Jam new_entry->efd_start_cluster = entry->efd_start_cluster; 462418aadd47SBobi Jam new_entry->efd_count += entry->efd_count; 4625c894058dSAneesh Kumar K.V rb_erase(node, &(db->bb_free_root)); 462618aadd47SBobi Jam kmem_cache_free(ext4_free_data_cachep, entry); 4627c9de560dSAlex Tomas } 4628c9de560dSAlex Tomas } 4629c894058dSAneesh Kumar K.V 4630c894058dSAneesh Kumar K.V node = rb_next(new_node); 4631c894058dSAneesh Kumar K.V if (node) { 463218aadd47SBobi Jam entry = rb_entry(node, struct ext4_free_data, efd_node); 46335d3ee208SDmitry Monakhov if (can_merge(new_entry, entry) && 46345d3ee208SDmitry Monakhov ext4_journal_callback_try_del(handle, &entry->efd_jce)) { 463518aadd47SBobi Jam new_entry->efd_count += entry->efd_count; 4636c894058dSAneesh Kumar K.V rb_erase(node, &(db->bb_free_root)); 463718aadd47SBobi Jam kmem_cache_free(ext4_free_data_cachep, entry); 4638c894058dSAneesh Kumar K.V } 4639c894058dSAneesh Kumar K.V } 46403e624fc7STheodore Ts'o /* Add the extent to transaction's private list */ 464118aadd47SBobi Jam ext4_journal_callback_add(handle, ext4_free_data_callback, 464218aadd47SBobi Jam &new_entry->efd_jce); 4643c9de560dSAlex Tomas return 0; 4644c9de560dSAlex Tomas } 4645c9de560dSAlex Tomas 464644338711STheodore Ts'o /** 464744338711STheodore Ts'o * ext4_free_blocks() -- Free given blocks and update quota 464844338711STheodore Ts'o * @handle: handle for this transaction 464944338711STheodore Ts'o * @inode: inode 465044338711STheodore Ts'o * @block: start physical block to free 465144338711STheodore Ts'o * @count: number of blocks to count 46525def1360SYongqiang Yang * @flags: flags used by ext4_free_blocks 4653c9de560dSAlex Tomas */ 465444338711STheodore Ts'o void ext4_free_blocks(handle_t *handle, struct inode *inode, 4655e6362609STheodore Ts'o struct buffer_head *bh, ext4_fsblk_t block, 4656e6362609STheodore Ts'o unsigned long count, int flags) 4657c9de560dSAlex Tomas { 465826346ff6SAneesh Kumar K.V struct buffer_head *bitmap_bh = NULL; 4659c9de560dSAlex Tomas struct super_block *sb = inode->i_sb; 4660c9de560dSAlex Tomas struct ext4_group_desc *gdp; 4661498e5f24STheodore Ts'o unsigned int overflow; 4662c9de560dSAlex Tomas ext4_grpblk_t bit; 4663c9de560dSAlex Tomas struct buffer_head *gd_bh; 4664c9de560dSAlex Tomas ext4_group_t block_group; 4665c9de560dSAlex Tomas struct ext4_sb_info *sbi; 4666c9de560dSAlex Tomas struct ext4_buddy e4b; 466784130193STheodore Ts'o unsigned int count_clusters; 4668c9de560dSAlex Tomas int err = 0; 4669c9de560dSAlex Tomas int ret; 4670c9de560dSAlex Tomas 4671b10a44c3STheodore Ts'o might_sleep(); 4672e6362609STheodore Ts'o if (bh) { 4673e6362609STheodore Ts'o if (block) 4674e6362609STheodore Ts'o BUG_ON(block != bh->b_blocknr); 4675e6362609STheodore Ts'o else 4676e6362609STheodore Ts'o block = bh->b_blocknr; 4677e6362609STheodore Ts'o } 4678c9de560dSAlex Tomas 4679c9de560dSAlex Tomas sbi = EXT4_SB(sb); 46801f2acb60STheodore Ts'o if (!(flags & EXT4_FREE_BLOCKS_VALIDATED) && 46811f2acb60STheodore Ts'o !ext4_data_block_valid(sbi, block, count)) { 468212062dddSEric Sandeen ext4_error(sb, "Freeing blocks not in datazone - " 46830610b6e9STheodore Ts'o "block = %llu, count = %lu", block, count); 4684c9de560dSAlex Tomas goto error_return; 4685c9de560dSAlex Tomas } 4686c9de560dSAlex Tomas 46870610b6e9STheodore Ts'o ext4_debug("freeing block %llu\n", block); 4688e6362609STheodore Ts'o trace_ext4_free_blocks(inode, block, count, flags); 4689e6362609STheodore Ts'o 46909c02ac97SDaeho Jeong if (bh && (flags & EXT4_FREE_BLOCKS_FORGET)) { 46919c02ac97SDaeho Jeong BUG_ON(count > 1); 4692e6362609STheodore Ts'o 4693e6362609STheodore Ts'o ext4_forget(handle, flags & EXT4_FREE_BLOCKS_METADATA, 46949c02ac97SDaeho Jeong inode, bh, block); 4695e6362609STheodore Ts'o } 4696e6362609STheodore Ts'o 4697e6362609STheodore Ts'o /* 469884130193STheodore Ts'o * If the extent to be freed does not begin on a cluster 469984130193STheodore Ts'o * boundary, we need to deal with partial clusters at the 470084130193STheodore Ts'o * beginning and end of the extent. Normally we will free 470184130193STheodore Ts'o * blocks at the beginning or the end unless we are explicitly 470284130193STheodore Ts'o * requested to avoid doing so. 470384130193STheodore Ts'o */ 4704f5a44db5STheodore Ts'o overflow = EXT4_PBLK_COFF(sbi, block); 470584130193STheodore Ts'o if (overflow) { 470684130193STheodore Ts'o if (flags & EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER) { 470784130193STheodore Ts'o overflow = sbi->s_cluster_ratio - overflow; 470884130193STheodore Ts'o block += overflow; 470984130193STheodore Ts'o if (count > overflow) 471084130193STheodore Ts'o count -= overflow; 471184130193STheodore Ts'o else 471284130193STheodore Ts'o return; 471384130193STheodore Ts'o } else { 471484130193STheodore Ts'o block -= overflow; 471584130193STheodore Ts'o count += overflow; 471684130193STheodore Ts'o } 471784130193STheodore Ts'o } 4718f5a44db5STheodore Ts'o overflow = EXT4_LBLK_COFF(sbi, count); 471984130193STheodore Ts'o if (overflow) { 472084130193STheodore Ts'o if (flags & EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER) { 472184130193STheodore Ts'o if (count > overflow) 472284130193STheodore Ts'o count -= overflow; 472384130193STheodore Ts'o else 472484130193STheodore Ts'o return; 472584130193STheodore Ts'o } else 472684130193STheodore Ts'o count += sbi->s_cluster_ratio - overflow; 472784130193STheodore Ts'o } 472884130193STheodore Ts'o 47299c02ac97SDaeho Jeong if (!bh && (flags & EXT4_FREE_BLOCKS_FORGET)) { 47309c02ac97SDaeho Jeong int i; 4731f96c450dSDaeho Jeong int is_metadata = flags & EXT4_FREE_BLOCKS_METADATA; 47329c02ac97SDaeho Jeong 47339c02ac97SDaeho Jeong for (i = 0; i < count; i++) { 47349c02ac97SDaeho Jeong cond_resched(); 4735f96c450dSDaeho Jeong if (is_metadata) 47369c02ac97SDaeho Jeong bh = sb_find_get_block(inode->i_sb, block + i); 4737f96c450dSDaeho Jeong ext4_forget(handle, is_metadata, inode, bh, block + i); 47389c02ac97SDaeho Jeong } 47399c02ac97SDaeho Jeong } 47409c02ac97SDaeho Jeong 4741c9de560dSAlex Tomas do_more: 4742c9de560dSAlex Tomas overflow = 0; 4743c9de560dSAlex Tomas ext4_get_group_no_and_offset(sb, block, &block_group, &bit); 4744c9de560dSAlex Tomas 4745163a203dSDarrick J. Wong if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT( 4746163a203dSDarrick J. Wong ext4_get_group_info(sb, block_group)))) 4747163a203dSDarrick J. Wong return; 4748163a203dSDarrick J. Wong 4749c9de560dSAlex Tomas /* 4750c9de560dSAlex Tomas * Check to see if we are freeing blocks across a group 4751c9de560dSAlex Tomas * boundary. 4752c9de560dSAlex Tomas */ 475384130193STheodore Ts'o if (EXT4_C2B(sbi, bit) + count > EXT4_BLOCKS_PER_GROUP(sb)) { 475484130193STheodore Ts'o overflow = EXT4_C2B(sbi, bit) + count - 475584130193STheodore Ts'o EXT4_BLOCKS_PER_GROUP(sb); 4756c9de560dSAlex Tomas count -= overflow; 4757c9de560dSAlex Tomas } 4758810da240SLukas Czerner count_clusters = EXT4_NUM_B2C(sbi, count); 4759574ca174STheodore Ts'o bitmap_bh = ext4_read_block_bitmap(sb, block_group); 47609008a58eSDarrick J. Wong if (IS_ERR(bitmap_bh)) { 47619008a58eSDarrick J. Wong err = PTR_ERR(bitmap_bh); 47629008a58eSDarrick J. Wong bitmap_bh = NULL; 4763c9de560dSAlex Tomas goto error_return; 4764ce89f46cSAneesh Kumar K.V } 4765c9de560dSAlex Tomas gdp = ext4_get_group_desc(sb, block_group, &gd_bh); 4766ce89f46cSAneesh Kumar K.V if (!gdp) { 4767ce89f46cSAneesh Kumar K.V err = -EIO; 4768c9de560dSAlex Tomas goto error_return; 4769ce89f46cSAneesh Kumar K.V } 4770c9de560dSAlex Tomas 4771c9de560dSAlex Tomas if (in_range(ext4_block_bitmap(sb, gdp), block, count) || 4772c9de560dSAlex Tomas in_range(ext4_inode_bitmap(sb, gdp), block, count) || 4773c9de560dSAlex Tomas in_range(block, ext4_inode_table(sb, gdp), 4774c9de560dSAlex Tomas EXT4_SB(sb)->s_itb_per_group) || 4775c9de560dSAlex Tomas in_range(block + count - 1, ext4_inode_table(sb, gdp), 4776c9de560dSAlex Tomas EXT4_SB(sb)->s_itb_per_group)) { 4777c9de560dSAlex Tomas 477812062dddSEric Sandeen ext4_error(sb, "Freeing blocks in system zone - " 47790610b6e9STheodore Ts'o "Block = %llu, count = %lu", block, count); 4780519deca0SAneesh Kumar K.V /* err = 0. ext4_std_error should be a no op */ 4781519deca0SAneesh Kumar K.V goto error_return; 4782c9de560dSAlex Tomas } 4783c9de560dSAlex Tomas 4784c9de560dSAlex Tomas BUFFER_TRACE(bitmap_bh, "getting write access"); 4785c9de560dSAlex Tomas err = ext4_journal_get_write_access(handle, bitmap_bh); 4786c9de560dSAlex Tomas if (err) 4787c9de560dSAlex Tomas goto error_return; 4788c9de560dSAlex Tomas 4789c9de560dSAlex Tomas /* 4790c9de560dSAlex Tomas * We are about to modify some metadata. Call the journal APIs 4791c9de560dSAlex Tomas * to unshare ->b_data if a currently-committing transaction is 4792c9de560dSAlex Tomas * using it 4793c9de560dSAlex Tomas */ 4794c9de560dSAlex Tomas BUFFER_TRACE(gd_bh, "get_write_access"); 4795c9de560dSAlex Tomas err = ext4_journal_get_write_access(handle, gd_bh); 4796c9de560dSAlex Tomas if (err) 4797c9de560dSAlex Tomas goto error_return; 4798c9de560dSAlex Tomas #ifdef AGGRESSIVE_CHECK 4799c9de560dSAlex Tomas { 4800c9de560dSAlex Tomas int i; 480184130193STheodore Ts'o for (i = 0; i < count_clusters; i++) 4802c9de560dSAlex Tomas BUG_ON(!mb_test_bit(bit + i, bitmap_bh->b_data)); 4803c9de560dSAlex Tomas } 4804c9de560dSAlex Tomas #endif 480584130193STheodore Ts'o trace_ext4_mballoc_free(sb, inode, block_group, bit, count_clusters); 4806c9de560dSAlex Tomas 4807920313a7SAneesh Kumar K.V err = ext4_mb_load_buddy(sb, block_group, &e4b); 4808920313a7SAneesh Kumar K.V if (err) 4809920313a7SAneesh Kumar K.V goto error_return; 4810e6362609STheodore Ts'o 4811f96c450dSDaeho Jeong /* 4812f96c450dSDaeho Jeong * We need to make sure we don't reuse the freed block until after the 4813f96c450dSDaeho Jeong * transaction is committed. We make an exception if the inode is to be 4814f96c450dSDaeho Jeong * written in writeback mode since writeback mode has weak data 4815f96c450dSDaeho Jeong * consistency guarantees. 4816f96c450dSDaeho Jeong */ 4817f96c450dSDaeho Jeong if (ext4_handle_valid(handle) && 4818f96c450dSDaeho Jeong ((flags & EXT4_FREE_BLOCKS_METADATA) || 4819f96c450dSDaeho Jeong !ext4_should_writeback_data(inode))) { 48207a2fcbf7SAneesh Kumar K.V struct ext4_free_data *new_entry; 48217a2fcbf7SAneesh Kumar K.V /* 48227444a072SMichal Hocko * We use __GFP_NOFAIL because ext4_free_blocks() is not allowed 48237444a072SMichal Hocko * to fail. 48247a2fcbf7SAneesh Kumar K.V */ 48257444a072SMichal Hocko new_entry = kmem_cache_alloc(ext4_free_data_cachep, 48267444a072SMichal Hocko GFP_NOFS|__GFP_NOFAIL); 482718aadd47SBobi Jam new_entry->efd_start_cluster = bit; 482818aadd47SBobi Jam new_entry->efd_group = block_group; 482918aadd47SBobi Jam new_entry->efd_count = count_clusters; 483018aadd47SBobi Jam new_entry->efd_tid = handle->h_transaction->t_tid; 4831955ce5f5SAneesh Kumar K.V 48327a2fcbf7SAneesh Kumar K.V ext4_lock_group(sb, block_group); 483384130193STheodore Ts'o mb_clear_bits(bitmap_bh->b_data, bit, count_clusters); 48347a2fcbf7SAneesh Kumar K.V ext4_mb_free_metadata(handle, &e4b, new_entry); 4835c9de560dSAlex Tomas } else { 48367a2fcbf7SAneesh Kumar K.V /* need to update group_info->bb_free and bitmap 48377a2fcbf7SAneesh Kumar K.V * with group lock held. generate_buddy look at 48387a2fcbf7SAneesh Kumar K.V * them with group lock_held 48397a2fcbf7SAneesh Kumar K.V */ 4840d71c1ae2SLukas Czerner if (test_opt(sb, DISCARD)) { 4841d71c1ae2SLukas Czerner err = ext4_issue_discard(sb, block_group, bit, count); 4842d71c1ae2SLukas Czerner if (err && err != -EOPNOTSUPP) 4843d71c1ae2SLukas Czerner ext4_msg(sb, KERN_WARNING, "discard request in" 4844d71c1ae2SLukas Czerner " group:%d block:%d count:%lu failed" 4845d71c1ae2SLukas Czerner " with %d", block_group, bit, count, 4846d71c1ae2SLukas Czerner err); 48478f9ff189SLukas Czerner } else 48488f9ff189SLukas Czerner EXT4_MB_GRP_CLEAR_TRIMMED(e4b.bd_info); 4849d71c1ae2SLukas Czerner 4850955ce5f5SAneesh Kumar K.V ext4_lock_group(sb, block_group); 485184130193STheodore Ts'o mb_clear_bits(bitmap_bh->b_data, bit, count_clusters); 485284130193STheodore Ts'o mb_free_blocks(inode, &e4b, bit, count_clusters); 4853c9de560dSAlex Tomas } 4854c9de560dSAlex Tomas 4855021b65bbSTheodore Ts'o ret = ext4_free_group_clusters(sb, gdp) + count_clusters; 4856021b65bbSTheodore Ts'o ext4_free_group_clusters_set(sb, gdp, ret); 485779f1ba49STao Ma ext4_block_bitmap_csum_set(sb, block_group, gdp, bitmap_bh); 4858feb0ab32SDarrick J. Wong ext4_group_desc_csum_set(sb, block_group, gdp); 4859955ce5f5SAneesh Kumar K.V ext4_unlock_group(sb, block_group); 4860c9de560dSAlex Tomas 4861772cb7c8SJose R. Santos if (sbi->s_log_groups_per_flex) { 4862772cb7c8SJose R. Santos ext4_group_t flex_group = ext4_flex_group(sbi, block_group); 486390ba983fSTheodore Ts'o atomic64_add(count_clusters, 486424aaa8efSTheodore Ts'o &sbi->s_flex_groups[flex_group].free_clusters); 4865772cb7c8SJose R. Santos } 4866772cb7c8SJose R. Santos 48677b415bf6SAditya Kali if (!(flags & EXT4_FREE_BLOCKS_NO_QUOT_UPDATE)) 48687b415bf6SAditya Kali dquot_free_block(inode, EXT4_C2B(sbi, count_clusters)); 48697d734532SJan Kara percpu_counter_add(&sbi->s_freeclusters_counter, count_clusters); 48707d734532SJan Kara 48717d734532SJan Kara ext4_mb_unload_buddy(&e4b); 48727b415bf6SAditya Kali 48737a2fcbf7SAneesh Kumar K.V /* We dirtied the bitmap block */ 48747a2fcbf7SAneesh Kumar K.V BUFFER_TRACE(bitmap_bh, "dirtied bitmap block"); 48757a2fcbf7SAneesh Kumar K.V err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); 48767a2fcbf7SAneesh Kumar K.V 4877c9de560dSAlex Tomas /* And the group descriptor block */ 4878c9de560dSAlex Tomas BUFFER_TRACE(gd_bh, "dirtied group descriptor block"); 48790390131bSFrank Mayhar ret = ext4_handle_dirty_metadata(handle, NULL, gd_bh); 4880c9de560dSAlex Tomas if (!err) 4881c9de560dSAlex Tomas err = ret; 4882c9de560dSAlex Tomas 4883c9de560dSAlex Tomas if (overflow && !err) { 4884c9de560dSAlex Tomas block += count; 4885c9de560dSAlex Tomas count = overflow; 4886c9de560dSAlex Tomas put_bh(bitmap_bh); 4887c9de560dSAlex Tomas goto do_more; 4888c9de560dSAlex Tomas } 4889c9de560dSAlex Tomas error_return: 4890c9de560dSAlex Tomas brelse(bitmap_bh); 4891c9de560dSAlex Tomas ext4_std_error(sb, err); 4892c9de560dSAlex Tomas return; 4893c9de560dSAlex Tomas } 48947360d173SLukas Czerner 48957360d173SLukas Czerner /** 48960529155eSYongqiang Yang * ext4_group_add_blocks() -- Add given blocks to an existing group 48972846e820SAmir Goldstein * @handle: handle to this transaction 48982846e820SAmir Goldstein * @sb: super block 48994907cb7bSAnatol Pomozov * @block: start physical block to add to the block group 49002846e820SAmir Goldstein * @count: number of blocks to free 49012846e820SAmir Goldstein * 4902e73a347bSAmir Goldstein * This marks the blocks as free in the bitmap and buddy. 49032846e820SAmir Goldstein */ 4904cc7365dfSYongqiang Yang int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 49052846e820SAmir Goldstein ext4_fsblk_t block, unsigned long count) 49062846e820SAmir Goldstein { 49072846e820SAmir Goldstein struct buffer_head *bitmap_bh = NULL; 49082846e820SAmir Goldstein struct buffer_head *gd_bh; 49092846e820SAmir Goldstein ext4_group_t block_group; 49102846e820SAmir Goldstein ext4_grpblk_t bit; 49112846e820SAmir Goldstein unsigned int i; 49122846e820SAmir Goldstein struct ext4_group_desc *desc; 49132846e820SAmir Goldstein struct ext4_sb_info *sbi = EXT4_SB(sb); 4914e73a347bSAmir Goldstein struct ext4_buddy e4b; 49152846e820SAmir Goldstein int err = 0, ret, blk_free_count; 49162846e820SAmir Goldstein ext4_grpblk_t blocks_freed; 49172846e820SAmir Goldstein 49182846e820SAmir Goldstein ext4_debug("Adding block(s) %llu-%llu\n", block, block + count - 1); 49192846e820SAmir Goldstein 49204740b830SYongqiang Yang if (count == 0) 49214740b830SYongqiang Yang return 0; 49224740b830SYongqiang Yang 49232846e820SAmir Goldstein ext4_get_group_no_and_offset(sb, block, &block_group, &bit); 49242846e820SAmir Goldstein /* 49252846e820SAmir Goldstein * Check to see if we are freeing blocks across a group 49262846e820SAmir Goldstein * boundary. 49272846e820SAmir Goldstein */ 4928cc7365dfSYongqiang Yang if (bit + count > EXT4_BLOCKS_PER_GROUP(sb)) { 4929cc7365dfSYongqiang Yang ext4_warning(sb, "too much blocks added to group %u\n", 4930cc7365dfSYongqiang Yang block_group); 4931cc7365dfSYongqiang Yang err = -EINVAL; 49322846e820SAmir Goldstein goto error_return; 4933cc7365dfSYongqiang Yang } 49342cd05cc3STheodore Ts'o 49352846e820SAmir Goldstein bitmap_bh = ext4_read_block_bitmap(sb, block_group); 49369008a58eSDarrick J. Wong if (IS_ERR(bitmap_bh)) { 49379008a58eSDarrick J. Wong err = PTR_ERR(bitmap_bh); 49389008a58eSDarrick J. Wong bitmap_bh = NULL; 49392846e820SAmir Goldstein goto error_return; 4940cc7365dfSYongqiang Yang } 4941cc7365dfSYongqiang Yang 49422846e820SAmir Goldstein desc = ext4_get_group_desc(sb, block_group, &gd_bh); 4943cc7365dfSYongqiang Yang if (!desc) { 4944cc7365dfSYongqiang Yang err = -EIO; 49452846e820SAmir Goldstein goto error_return; 4946cc7365dfSYongqiang Yang } 49472846e820SAmir Goldstein 49482846e820SAmir Goldstein if (in_range(ext4_block_bitmap(sb, desc), block, count) || 49492846e820SAmir Goldstein in_range(ext4_inode_bitmap(sb, desc), block, count) || 49502846e820SAmir Goldstein in_range(block, ext4_inode_table(sb, desc), sbi->s_itb_per_group) || 49512846e820SAmir Goldstein in_range(block + count - 1, ext4_inode_table(sb, desc), 49522846e820SAmir Goldstein sbi->s_itb_per_group)) { 49532846e820SAmir Goldstein ext4_error(sb, "Adding blocks in system zones - " 49542846e820SAmir Goldstein "Block = %llu, count = %lu", 49552846e820SAmir Goldstein block, count); 4956cc7365dfSYongqiang Yang err = -EINVAL; 49572846e820SAmir Goldstein goto error_return; 49582846e820SAmir Goldstein } 49592846e820SAmir Goldstein 49602cd05cc3STheodore Ts'o BUFFER_TRACE(bitmap_bh, "getting write access"); 49612cd05cc3STheodore Ts'o err = ext4_journal_get_write_access(handle, bitmap_bh); 49622846e820SAmir Goldstein if (err) 49632846e820SAmir Goldstein goto error_return; 49642846e820SAmir Goldstein 49652846e820SAmir Goldstein /* 49662846e820SAmir Goldstein * We are about to modify some metadata. Call the journal APIs 49672846e820SAmir Goldstein * to unshare ->b_data if a currently-committing transaction is 49682846e820SAmir Goldstein * using it 49692846e820SAmir Goldstein */ 49702846e820SAmir Goldstein BUFFER_TRACE(gd_bh, "get_write_access"); 49712846e820SAmir Goldstein err = ext4_journal_get_write_access(handle, gd_bh); 49722846e820SAmir Goldstein if (err) 49732846e820SAmir Goldstein goto error_return; 4974e73a347bSAmir Goldstein 49752846e820SAmir Goldstein for (i = 0, blocks_freed = 0; i < count; i++) { 49762846e820SAmir Goldstein BUFFER_TRACE(bitmap_bh, "clear bit"); 4977e73a347bSAmir Goldstein if (!mb_test_bit(bit + i, bitmap_bh->b_data)) { 49782846e820SAmir Goldstein ext4_error(sb, "bit already cleared for block %llu", 49792846e820SAmir Goldstein (ext4_fsblk_t)(block + i)); 49802846e820SAmir Goldstein BUFFER_TRACE(bitmap_bh, "bit already cleared"); 49812846e820SAmir Goldstein } else { 49822846e820SAmir Goldstein blocks_freed++; 49832846e820SAmir Goldstein } 49842846e820SAmir Goldstein } 4985e73a347bSAmir Goldstein 4986e73a347bSAmir Goldstein err = ext4_mb_load_buddy(sb, block_group, &e4b); 4987e73a347bSAmir Goldstein if (err) 4988e73a347bSAmir Goldstein goto error_return; 4989e73a347bSAmir Goldstein 4990e73a347bSAmir Goldstein /* 4991e73a347bSAmir Goldstein * need to update group_info->bb_free and bitmap 4992e73a347bSAmir Goldstein * with group lock held. generate_buddy look at 4993e73a347bSAmir Goldstein * them with group lock_held 4994e73a347bSAmir Goldstein */ 49952846e820SAmir Goldstein ext4_lock_group(sb, block_group); 4996e73a347bSAmir Goldstein mb_clear_bits(bitmap_bh->b_data, bit, count); 4997e73a347bSAmir Goldstein mb_free_blocks(NULL, &e4b, bit, count); 4998021b65bbSTheodore Ts'o blk_free_count = blocks_freed + ext4_free_group_clusters(sb, desc); 4999021b65bbSTheodore Ts'o ext4_free_group_clusters_set(sb, desc, blk_free_count); 500079f1ba49STao Ma ext4_block_bitmap_csum_set(sb, block_group, desc, bitmap_bh); 5001feb0ab32SDarrick J. Wong ext4_group_desc_csum_set(sb, block_group, desc); 50022846e820SAmir Goldstein ext4_unlock_group(sb, block_group); 500357042651STheodore Ts'o percpu_counter_add(&sbi->s_freeclusters_counter, 5004810da240SLukas Czerner EXT4_NUM_B2C(sbi, blocks_freed)); 50052846e820SAmir Goldstein 50062846e820SAmir Goldstein if (sbi->s_log_groups_per_flex) { 50072846e820SAmir Goldstein ext4_group_t flex_group = ext4_flex_group(sbi, block_group); 500890ba983fSTheodore Ts'o atomic64_add(EXT4_NUM_B2C(sbi, blocks_freed), 500924aaa8efSTheodore Ts'o &sbi->s_flex_groups[flex_group].free_clusters); 50102846e820SAmir Goldstein } 5011e73a347bSAmir Goldstein 5012e73a347bSAmir Goldstein ext4_mb_unload_buddy(&e4b); 50132846e820SAmir Goldstein 50142846e820SAmir Goldstein /* We dirtied the bitmap block */ 50152846e820SAmir Goldstein BUFFER_TRACE(bitmap_bh, "dirtied bitmap block"); 50162846e820SAmir Goldstein err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); 50172846e820SAmir Goldstein 50182846e820SAmir Goldstein /* And the group descriptor block */ 50192846e820SAmir Goldstein BUFFER_TRACE(gd_bh, "dirtied group descriptor block"); 50202846e820SAmir Goldstein ret = ext4_handle_dirty_metadata(handle, NULL, gd_bh); 50212846e820SAmir Goldstein if (!err) 50222846e820SAmir Goldstein err = ret; 50232846e820SAmir Goldstein 50242846e820SAmir Goldstein error_return: 50252846e820SAmir Goldstein brelse(bitmap_bh); 50262846e820SAmir Goldstein ext4_std_error(sb, err); 5027cc7365dfSYongqiang Yang return err; 50282846e820SAmir Goldstein } 50292846e820SAmir Goldstein 50302846e820SAmir Goldstein /** 50317360d173SLukas Czerner * ext4_trim_extent -- function to TRIM one single free extent in the group 50327360d173SLukas Czerner * @sb: super block for the file system 50337360d173SLukas Czerner * @start: starting block of the free extent in the alloc. group 50347360d173SLukas Czerner * @count: number of blocks to TRIM 50357360d173SLukas Czerner * @group: alloc. group we are working with 50367360d173SLukas Czerner * @e4b: ext4 buddy for the group 50377360d173SLukas Czerner * 50387360d173SLukas Czerner * Trim "count" blocks starting at "start" in the "group". To assure that no 50397360d173SLukas Czerner * one will allocate those blocks, mark it as used in buddy bitmap. This must 50407360d173SLukas Czerner * be called with under the group lock. 50417360d173SLukas Czerner */ 5042d71c1ae2SLukas Czerner static int ext4_trim_extent(struct super_block *sb, int start, int count, 50437360d173SLukas Czerner ext4_group_t group, struct ext4_buddy *e4b) 5044e2cbd587Sjon ernst __releases(bitlock) 5045e2cbd587Sjon ernst __acquires(bitlock) 50467360d173SLukas Czerner { 50477360d173SLukas Czerner struct ext4_free_extent ex; 5048d71c1ae2SLukas Czerner int ret = 0; 50497360d173SLukas Czerner 5050b3d4c2b1STao Ma trace_ext4_trim_extent(sb, group, start, count); 5051b3d4c2b1STao Ma 50527360d173SLukas Czerner assert_spin_locked(ext4_group_lock_ptr(sb, group)); 50537360d173SLukas Czerner 50547360d173SLukas Czerner ex.fe_start = start; 50557360d173SLukas Czerner ex.fe_group = group; 50567360d173SLukas Czerner ex.fe_len = count; 50577360d173SLukas Czerner 50587360d173SLukas Czerner /* 50597360d173SLukas Czerner * Mark blocks used, so no one can reuse them while 50607360d173SLukas Czerner * being trimmed. 50617360d173SLukas Czerner */ 50627360d173SLukas Czerner mb_mark_used(e4b, &ex); 50637360d173SLukas Czerner ext4_unlock_group(sb, group); 5064d71c1ae2SLukas Czerner ret = ext4_issue_discard(sb, group, start, count); 50657360d173SLukas Czerner ext4_lock_group(sb, group); 50667360d173SLukas Czerner mb_free_blocks(NULL, e4b, start, ex.fe_len); 5067d71c1ae2SLukas Czerner return ret; 50687360d173SLukas Czerner } 50697360d173SLukas Czerner 50707360d173SLukas Czerner /** 50717360d173SLukas Czerner * ext4_trim_all_free -- function to trim all free space in alloc. group 50727360d173SLukas Czerner * @sb: super block for file system 507322612283STao Ma * @group: group to be trimmed 50747360d173SLukas Czerner * @start: first group block to examine 50757360d173SLukas Czerner * @max: last group block to examine 50767360d173SLukas Czerner * @minblocks: minimum extent block count 50777360d173SLukas Czerner * 50787360d173SLukas Czerner * ext4_trim_all_free walks through group's buddy bitmap searching for free 50797360d173SLukas Czerner * extents. When the free block is found, ext4_trim_extent is called to TRIM 50807360d173SLukas Czerner * the extent. 50817360d173SLukas Czerner * 50827360d173SLukas Czerner * 50837360d173SLukas Czerner * ext4_trim_all_free walks through group's block bitmap searching for free 50847360d173SLukas Czerner * extents. When the free extent is found, mark it as used in group buddy 50857360d173SLukas Czerner * bitmap. Then issue a TRIM command on this extent and free the extent in 50867360d173SLukas Czerner * the group buddy bitmap. This is done until whole group is scanned. 50877360d173SLukas Czerner */ 50880b75a840SLukas Czerner static ext4_grpblk_t 508978944086SLukas Czerner ext4_trim_all_free(struct super_block *sb, ext4_group_t group, 509078944086SLukas Czerner ext4_grpblk_t start, ext4_grpblk_t max, 509178944086SLukas Czerner ext4_grpblk_t minblocks) 50927360d173SLukas Czerner { 50937360d173SLukas Czerner void *bitmap; 5094169ddc3eSTao Ma ext4_grpblk_t next, count = 0, free_count = 0; 509578944086SLukas Czerner struct ext4_buddy e4b; 5096d71c1ae2SLukas Czerner int ret = 0; 50977360d173SLukas Czerner 5098b3d4c2b1STao Ma trace_ext4_trim_all_free(sb, group, start, max); 5099b3d4c2b1STao Ma 510078944086SLukas Czerner ret = ext4_mb_load_buddy(sb, group, &e4b); 510178944086SLukas Czerner if (ret) { 510278944086SLukas Czerner ext4_error(sb, "Error in loading buddy " 510378944086SLukas Czerner "information for %u", group); 510478944086SLukas Czerner return ret; 510578944086SLukas Czerner } 510678944086SLukas Czerner bitmap = e4b.bd_bitmap; 510728739eeaSLukas Czerner 510828739eeaSLukas Czerner ext4_lock_group(sb, group); 51093d56b8d2STao Ma if (EXT4_MB_GRP_WAS_TRIMMED(e4b.bd_info) && 51103d56b8d2STao Ma minblocks >= atomic_read(&EXT4_SB(sb)->s_last_trim_minblks)) 51113d56b8d2STao Ma goto out; 51123d56b8d2STao Ma 511378944086SLukas Czerner start = (e4b.bd_info->bb_first_free > start) ? 511478944086SLukas Czerner e4b.bd_info->bb_first_free : start; 51157360d173SLukas Czerner 5116913eed83SLukas Czerner while (start <= max) { 5117913eed83SLukas Czerner start = mb_find_next_zero_bit(bitmap, max + 1, start); 5118913eed83SLukas Czerner if (start > max) 51197360d173SLukas Czerner break; 5120913eed83SLukas Czerner next = mb_find_next_bit(bitmap, max + 1, start); 51217360d173SLukas Czerner 51227360d173SLukas Czerner if ((next - start) >= minblocks) { 5123d71c1ae2SLukas Czerner ret = ext4_trim_extent(sb, start, 512478944086SLukas Czerner next - start, group, &e4b); 5125d71c1ae2SLukas Czerner if (ret && ret != -EOPNOTSUPP) 5126d71c1ae2SLukas Czerner break; 5127d71c1ae2SLukas Czerner ret = 0; 51287360d173SLukas Czerner count += next - start; 51297360d173SLukas Czerner } 5130169ddc3eSTao Ma free_count += next - start; 51317360d173SLukas Czerner start = next + 1; 51327360d173SLukas Czerner 51337360d173SLukas Czerner if (fatal_signal_pending(current)) { 51347360d173SLukas Czerner count = -ERESTARTSYS; 51357360d173SLukas Czerner break; 51367360d173SLukas Czerner } 51377360d173SLukas Czerner 51387360d173SLukas Czerner if (need_resched()) { 51397360d173SLukas Czerner ext4_unlock_group(sb, group); 51407360d173SLukas Czerner cond_resched(); 51417360d173SLukas Czerner ext4_lock_group(sb, group); 51427360d173SLukas Czerner } 51437360d173SLukas Czerner 5144169ddc3eSTao Ma if ((e4b.bd_info->bb_free - free_count) < minblocks) 51457360d173SLukas Czerner break; 51467360d173SLukas Czerner } 51473d56b8d2STao Ma 5148d71c1ae2SLukas Czerner if (!ret) { 5149d71c1ae2SLukas Czerner ret = count; 51503d56b8d2STao Ma EXT4_MB_GRP_SET_TRIMMED(e4b.bd_info); 5151d71c1ae2SLukas Czerner } 51523d56b8d2STao Ma out: 51537360d173SLukas Czerner ext4_unlock_group(sb, group); 515478944086SLukas Czerner ext4_mb_unload_buddy(&e4b); 51557360d173SLukas Czerner 51567360d173SLukas Czerner ext4_debug("trimmed %d blocks in the group %d\n", 51577360d173SLukas Czerner count, group); 51587360d173SLukas Czerner 5159d71c1ae2SLukas Czerner return ret; 51607360d173SLukas Czerner } 51617360d173SLukas Czerner 51627360d173SLukas Czerner /** 51637360d173SLukas Czerner * ext4_trim_fs() -- trim ioctl handle function 51647360d173SLukas Czerner * @sb: superblock for filesystem 51657360d173SLukas Czerner * @range: fstrim_range structure 51667360d173SLukas Czerner * 51677360d173SLukas Czerner * start: First Byte to trim 51687360d173SLukas Czerner * len: number of Bytes to trim from start 51697360d173SLukas Czerner * minlen: minimum extent length in Bytes 51707360d173SLukas Czerner * ext4_trim_fs goes through all allocation groups containing Bytes from 51717360d173SLukas Czerner * start to start+len. For each such a group ext4_trim_all_free function 51727360d173SLukas Czerner * is invoked to trim all free space. 51737360d173SLukas Czerner */ 51747360d173SLukas Czerner int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range) 51757360d173SLukas Czerner { 517678944086SLukas Czerner struct ext4_group_info *grp; 5177913eed83SLukas Czerner ext4_group_t group, first_group, last_group; 51787137d7a4STheodore Ts'o ext4_grpblk_t cnt = 0, first_cluster, last_cluster; 5179913eed83SLukas Czerner uint64_t start, end, minlen, trimmed = 0; 51800f0a25bfSJan Kara ext4_fsblk_t first_data_blk = 51810f0a25bfSJan Kara le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 5182913eed83SLukas Czerner ext4_fsblk_t max_blks = ext4_blocks_count(EXT4_SB(sb)->s_es); 51837360d173SLukas Czerner int ret = 0; 51847360d173SLukas Czerner 51857360d173SLukas Czerner start = range->start >> sb->s_blocksize_bits; 5186913eed83SLukas Czerner end = start + (range->len >> sb->s_blocksize_bits) - 1; 5187aaf7d73eSLukas Czerner minlen = EXT4_NUM_B2C(EXT4_SB(sb), 5188aaf7d73eSLukas Czerner range->minlen >> sb->s_blocksize_bits); 51897360d173SLukas Czerner 51905de35e8dSLukas Czerner if (minlen > EXT4_CLUSTERS_PER_GROUP(sb) || 51915de35e8dSLukas Czerner start >= max_blks || 51925de35e8dSLukas Czerner range->len < sb->s_blocksize) 51937360d173SLukas Czerner return -EINVAL; 5194913eed83SLukas Czerner if (end >= max_blks) 5195913eed83SLukas Czerner end = max_blks - 1; 5196913eed83SLukas Czerner if (end <= first_data_blk) 519722f10457STao Ma goto out; 5198913eed83SLukas Czerner if (start < first_data_blk) 51990f0a25bfSJan Kara start = first_data_blk; 52007360d173SLukas Czerner 5201913eed83SLukas Czerner /* Determine first and last group to examine based on start and end */ 52027360d173SLukas Czerner ext4_get_group_no_and_offset(sb, (ext4_fsblk_t) start, 52037137d7a4STheodore Ts'o &first_group, &first_cluster); 5204913eed83SLukas Czerner ext4_get_group_no_and_offset(sb, (ext4_fsblk_t) end, 52057137d7a4STheodore Ts'o &last_group, &last_cluster); 52067360d173SLukas Czerner 5207913eed83SLukas Czerner /* end now represents the last cluster to discard in this group */ 5208913eed83SLukas Czerner end = EXT4_CLUSTERS_PER_GROUP(sb) - 1; 52097360d173SLukas Czerner 52107360d173SLukas Czerner for (group = first_group; group <= last_group; group++) { 521178944086SLukas Czerner grp = ext4_get_group_info(sb, group); 521278944086SLukas Czerner /* We only do this if the grp has never been initialized */ 521378944086SLukas Czerner if (unlikely(EXT4_MB_GRP_NEED_INIT(grp))) { 521478944086SLukas Czerner ret = ext4_mb_init_group(sb, group); 521578944086SLukas Czerner if (ret) 52167360d173SLukas Czerner break; 52177360d173SLukas Czerner } 52187360d173SLukas Czerner 52190ba08517STao Ma /* 5220913eed83SLukas Czerner * For all the groups except the last one, last cluster will 5221913eed83SLukas Czerner * always be EXT4_CLUSTERS_PER_GROUP(sb)-1, so we only need to 5222913eed83SLukas Czerner * change it for the last group, note that last_cluster is 5223913eed83SLukas Czerner * already computed earlier by ext4_get_group_no_and_offset() 52240ba08517STao Ma */ 5225913eed83SLukas Czerner if (group == last_group) 5226913eed83SLukas Czerner end = last_cluster; 52277360d173SLukas Czerner 522878944086SLukas Czerner if (grp->bb_free >= minlen) { 52297137d7a4STheodore Ts'o cnt = ext4_trim_all_free(sb, group, first_cluster, 5230913eed83SLukas Czerner end, minlen); 52317360d173SLukas Czerner if (cnt < 0) { 52327360d173SLukas Czerner ret = cnt; 52337360d173SLukas Czerner break; 52347360d173SLukas Czerner } 52357360d173SLukas Czerner trimmed += cnt; 523621e7fd22SLukas Czerner } 5237913eed83SLukas Czerner 5238913eed83SLukas Czerner /* 5239913eed83SLukas Czerner * For every group except the first one, we are sure 5240913eed83SLukas Czerner * that the first cluster to discard will be cluster #0. 5241913eed83SLukas Czerner */ 52427137d7a4STheodore Ts'o first_cluster = 0; 52437360d173SLukas Czerner } 52447360d173SLukas Czerner 52453d56b8d2STao Ma if (!ret) 52463d56b8d2STao Ma atomic_set(&EXT4_SB(sb)->s_last_trim_minblks, minlen); 52473d56b8d2STao Ma 524822f10457STao Ma out: 5249aaf7d73eSLukas Czerner range->len = EXT4_C2B(EXT4_SB(sb), trimmed) << sb->s_blocksize_bits; 52507360d173SLukas Czerner return ret; 52517360d173SLukas Czerner } 5252