13dcf5451SChristoph Hellwig /* 23dcf5451SChristoph Hellwig * ext4.h 33dcf5451SChristoph Hellwig * 43dcf5451SChristoph Hellwig * Copyright (C) 1992, 1993, 1994, 1995 53dcf5451SChristoph Hellwig * Remy Card (card@masi.ibp.fr) 63dcf5451SChristoph Hellwig * Laboratoire MASI - Institut Blaise Pascal 73dcf5451SChristoph Hellwig * Universite Pierre et Marie Curie (Paris VI) 83dcf5451SChristoph Hellwig * 93dcf5451SChristoph Hellwig * from 103dcf5451SChristoph Hellwig * 113dcf5451SChristoph Hellwig * linux/include/linux/minix_fs.h 123dcf5451SChristoph Hellwig * 133dcf5451SChristoph Hellwig * Copyright (C) 1991, 1992 Linus Torvalds 143dcf5451SChristoph Hellwig */ 153dcf5451SChristoph Hellwig 163dcf5451SChristoph Hellwig #ifndef _EXT4_H 173dcf5451SChristoph Hellwig #define _EXT4_H 183dcf5451SChristoph Hellwig 193dcf5451SChristoph Hellwig #include <linux/types.h> 203dcf5451SChristoph Hellwig #include <linux/blkdev.h> 213dcf5451SChristoph Hellwig #include <linux/magic.h> 222ccb5fb9SAneesh Kumar K.V #include <linux/jbd2.h> 2360e58e0fSMingming Cao #include <linux/quota.h> 24d444c3c3STheodore Ts'o #include <linux/rwsem.h> 25d444c3c3STheodore Ts'o #include <linux/rbtree.h> 26d444c3c3STheodore Ts'o #include <linux/seqlock.h> 27d444c3c3STheodore Ts'o #include <linux/mutex.h> 28ca0faba0STheodore Ts'o #include <linux/timer.h> 29ca0faba0STheodore Ts'o #include <linux/wait.h> 30ca0faba0STheodore Ts'o #include <linux/blockgroup_lock.h> 31ca0faba0STheodore Ts'o #include <linux/percpu_counter.h> 324d92dc0fSBen Hutchings #ifdef __KERNEL__ 334d92dc0fSBen Hutchings #include <linux/compat.h> 344d92dc0fSBen Hutchings #endif 353dcf5451SChristoph Hellwig 363dcf5451SChristoph Hellwig /* 378a35694eSShen Feng * The fourth extended filesystem constants/structures 383dcf5451SChristoph Hellwig */ 393dcf5451SChristoph Hellwig 403dcf5451SChristoph Hellwig /* 413dcf5451SChristoph Hellwig * Define EXT4FS_DEBUG to produce debug messages 423dcf5451SChristoph Hellwig */ 433dcf5451SChristoph Hellwig #undef EXT4FS_DEBUG 443dcf5451SChristoph Hellwig 453dcf5451SChristoph Hellwig /* 463dcf5451SChristoph Hellwig * Debug code 473dcf5451SChristoph Hellwig */ 483dcf5451SChristoph Hellwig #ifdef EXT4FS_DEBUG 493dcf5451SChristoph Hellwig #define ext4_debug(f, a...) \ 503dcf5451SChristoph Hellwig do { \ 513dcf5451SChristoph Hellwig printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 524db9c54aSStoyan Gaydarov __FILE__, __LINE__, __func__); \ 533dcf5451SChristoph Hellwig printk(KERN_DEBUG f, ## a); \ 543dcf5451SChristoph Hellwig } while (0) 553dcf5451SChristoph Hellwig #else 56ace36ad4SJoe Perches #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 573dcf5451SChristoph Hellwig #endif 583dcf5451SChristoph Hellwig 59273df556SFrank Mayhar #define EXT4_ERROR_INODE(inode, fmt, a...) \ 60c398eda0STheodore Ts'o ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 61c398eda0STheodore Ts'o 62c398eda0STheodore Ts'o #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 63c398eda0STheodore Ts'o ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 64273df556SFrank Mayhar 65f7c21177STheodore Ts'o #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 66f7c21177STheodore Ts'o ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 67273df556SFrank Mayhar 68d444c3c3STheodore Ts'o /* data type for block offset of block group */ 69d444c3c3STheodore Ts'o typedef int ext4_grpblk_t; 70d444c3c3STheodore Ts'o 71d444c3c3STheodore Ts'o /* data type for filesystem-wide blocks number */ 72d444c3c3STheodore Ts'o typedef unsigned long long ext4_fsblk_t; 73d444c3c3STheodore Ts'o 74d444c3c3STheodore Ts'o /* data type for file logical block number */ 75d444c3c3STheodore Ts'o typedef __u32 ext4_lblk_t; 76d444c3c3STheodore Ts'o 77d444c3c3STheodore Ts'o /* data type for block group number */ 78d444c3c3STheodore Ts'o typedef unsigned int ext4_group_t; 79d444c3c3STheodore Ts'o 80296c355cSTheodore Ts'o /* 81296c355cSTheodore Ts'o * Flags used in mballoc's allocation_context flags field. 82296c355cSTheodore Ts'o * 83296c355cSTheodore Ts'o * Also used to show what's going on for debugging purposes when the 84296c355cSTheodore Ts'o * flag field is exported via the traceport interface 85296c355cSTheodore Ts'o */ 86d444c3c3STheodore Ts'o 873dcf5451SChristoph Hellwig /* prefer goal again. length */ 880ef90db9STheodore Ts'o #define EXT4_MB_HINT_MERGE 0x0001 893dcf5451SChristoph Hellwig /* blocks already reserved */ 900ef90db9STheodore Ts'o #define EXT4_MB_HINT_RESERVED 0x0002 913dcf5451SChristoph Hellwig /* metadata is being allocated */ 920ef90db9STheodore Ts'o #define EXT4_MB_HINT_METADATA 0x0004 933dcf5451SChristoph Hellwig /* first blocks in the file */ 940ef90db9STheodore Ts'o #define EXT4_MB_HINT_FIRST 0x0008 953dcf5451SChristoph Hellwig /* search for the best chunk */ 960ef90db9STheodore Ts'o #define EXT4_MB_HINT_BEST 0x0010 973dcf5451SChristoph Hellwig /* data is being allocated */ 980ef90db9STheodore Ts'o #define EXT4_MB_HINT_DATA 0x0020 993dcf5451SChristoph Hellwig /* don't preallocate (for tails) */ 1000ef90db9STheodore Ts'o #define EXT4_MB_HINT_NOPREALLOC 0x0040 1013dcf5451SChristoph Hellwig /* allocate for locality group */ 1020ef90db9STheodore Ts'o #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 1033dcf5451SChristoph Hellwig /* allocate goal blocks or none */ 1040ef90db9STheodore Ts'o #define EXT4_MB_HINT_GOAL_ONLY 0x0100 1053dcf5451SChristoph Hellwig /* goal is meaningful */ 1060ef90db9STheodore Ts'o #define EXT4_MB_HINT_TRY_GOAL 0x0200 107d2a17637SMingming Cao /* blocks already pre-reserved by delayed allocation */ 1080ef90db9STheodore Ts'o #define EXT4_MB_DELALLOC_RESERVED 0x0400 1094ba74d00STheodore Ts'o /* We are doing stream allocation */ 1104ba74d00STheodore Ts'o #define EXT4_MB_STREAM_ALLOC 0x0800 11155f020dbSAllison Henderson /* Use reserved root blocks if needed */ 11255f020dbSAllison Henderson #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 1133dcf5451SChristoph Hellwig 1143dcf5451SChristoph Hellwig struct ext4_allocation_request { 1153dcf5451SChristoph Hellwig /* target inode for block we're allocating */ 1163dcf5451SChristoph Hellwig struct inode *inode; 1173dcf5451SChristoph Hellwig /* how many blocks we want to allocate */ 118498e5f24STheodore Ts'o unsigned int len; 119726447d8SEric Sandeen /* logical block in target inode */ 120726447d8SEric Sandeen ext4_lblk_t logical; 121726447d8SEric Sandeen /* the closest logical allocated block to the left */ 122726447d8SEric Sandeen ext4_lblk_t lleft; 123726447d8SEric Sandeen /* the closest logical allocated block to the right */ 124726447d8SEric Sandeen ext4_lblk_t lright; 125726447d8SEric Sandeen /* phys. target (a hint) */ 126726447d8SEric Sandeen ext4_fsblk_t goal; 127726447d8SEric Sandeen /* phys. block for the closest logical allocated block to the left */ 128726447d8SEric Sandeen ext4_fsblk_t pleft; 129726447d8SEric Sandeen /* phys. block for the closest logical allocated block to the right */ 130726447d8SEric Sandeen ext4_fsblk_t pright; 1313dcf5451SChristoph Hellwig /* flags. see above EXT4_MB_HINT_* */ 132498e5f24STheodore Ts'o unsigned int flags; 1333dcf5451SChristoph Hellwig }; 1343dcf5451SChristoph Hellwig 1353dcf5451SChristoph Hellwig /* 136e35fd660STheodore Ts'o * Logical to physical block mapping, used by ext4_map_blocks() 137e35fd660STheodore Ts'o * 138e35fd660STheodore Ts'o * This structure is used to pass requests into ext4_map_blocks() as 139e35fd660STheodore Ts'o * well as to store the information returned by ext4_map_blocks(). It 140e35fd660STheodore Ts'o * takes less room on the stack than a struct buffer_head. 141e35fd660STheodore Ts'o */ 142e35fd660STheodore Ts'o #define EXT4_MAP_NEW (1 << BH_New) 143e35fd660STheodore Ts'o #define EXT4_MAP_MAPPED (1 << BH_Mapped) 144e35fd660STheodore Ts'o #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 145e35fd660STheodore Ts'o #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 146e35fd660STheodore Ts'o #define EXT4_MAP_UNINIT (1 << BH_Uninit) 1477b415bf6SAditya Kali /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of 1487b415bf6SAditya Kali * ext4_map_blocks wants to know whether or not the underlying cluster has 1497b415bf6SAditya Kali * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that 1507b415bf6SAditya Kali * the requested mapping was from previously mapped (or delayed allocated) 1517b415bf6SAditya Kali * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster 1527b415bf6SAditya Kali * should never appear on buffer_head's state flags. 1537b415bf6SAditya Kali */ 1547b415bf6SAditya Kali #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster) 155e35fd660STheodore Ts'o #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 156e35fd660STheodore Ts'o EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 1577b415bf6SAditya Kali EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER) 158e35fd660STheodore Ts'o 159e35fd660STheodore Ts'o struct ext4_map_blocks { 160e35fd660STheodore Ts'o ext4_fsblk_t m_pblk; 161e35fd660STheodore Ts'o ext4_lblk_t m_lblk; 162e35fd660STheodore Ts'o unsigned int m_len; 163e35fd660STheodore Ts'o unsigned int m_flags; 164e35fd660STheodore Ts'o }; 165e35fd660STheodore Ts'o 166e35fd660STheodore Ts'o /* 167b3a3ca8cSTheodore Ts'o * For delayed allocation tracking 168b3a3ca8cSTheodore Ts'o */ 169b3a3ca8cSTheodore Ts'o struct mpage_da_data { 170b3a3ca8cSTheodore Ts'o struct inode *inode; 171b3a3ca8cSTheodore Ts'o sector_t b_blocknr; /* start block number of extent */ 172b3a3ca8cSTheodore Ts'o size_t b_size; /* size of extent */ 173b3a3ca8cSTheodore Ts'o unsigned long b_state; /* state of the extent */ 174b3a3ca8cSTheodore Ts'o unsigned long first_page, next_page; /* extent of pages */ 175b3a3ca8cSTheodore Ts'o struct writeback_control *wbc; 176b3a3ca8cSTheodore Ts'o int io_done; 177b3a3ca8cSTheodore Ts'o int pages_written; 178b3a3ca8cSTheodore Ts'o int retval; 179b3a3ca8cSTheodore Ts'o }; 180bd2d0210STheodore Ts'o 181bd2d0210STheodore Ts'o /* 182bd2d0210STheodore Ts'o * Flags for ext4_io_end->flags 183bd2d0210STheodore Ts'o */ 184bd2d0210STheodore Ts'o #define EXT4_IO_END_UNWRITTEN 0x0001 185bd2d0210STheodore Ts'o #define EXT4_IO_END_ERROR 0x0002 1868c0bec21SJiaying Zhang #define EXT4_IO_END_QUEUED 0x0004 187266991b1SJeff Moyer #define EXT4_IO_END_DIRECT 0x0008 188491caa43SJeff Moyer #define EXT4_IO_END_IN_FSYNC 0x0010 189bd2d0210STheodore Ts'o 190bd2d0210STheodore Ts'o struct ext4_io_page { 191bd2d0210STheodore Ts'o struct page *p_page; 19283668e71STheodore Ts'o atomic_t p_count; 193bd2d0210STheodore Ts'o }; 194bd2d0210STheodore Ts'o 195bd2d0210STheodore Ts'o #define MAX_IO_PAGES 128 196bd2d0210STheodore Ts'o 1974188188bSCurt Wohlgemuth /* 1984188188bSCurt Wohlgemuth * For converting uninitialized extents on a work queue. 1994188188bSCurt Wohlgemuth * 2004188188bSCurt Wohlgemuth * 'page' is only used from the writepage() path; 'pages' is only used for 2014188188bSCurt Wohlgemuth * buffered writes; they are used to keep page references until conversion 2024188188bSCurt Wohlgemuth * takes place. For AIO/DIO, neither field is filled in. 2034188188bSCurt Wohlgemuth */ 2040031462bSMingming Cao typedef struct ext4_io_end { 2055b3ff237Sjiayingz@google.com (Jiaying Zhang) struct list_head list; /* per-file finished IO list */ 2060031462bSMingming Cao struct inode *inode; /* file being written to */ 2078d5d02e6SMingming Cao unsigned int flag; /* unwritten or not */ 2084188188bSCurt Wohlgemuth struct page *page; /* for writepage() path */ 209a1de02dcSEric Sandeen loff_t offset; /* offset in the file */ 210a1de02dcSEric Sandeen ssize_t size; /* size of the extent */ 2110031462bSMingming Cao struct work_struct work; /* data work queue */ 2125b3ff237Sjiayingz@google.com (Jiaying Zhang) struct kiocb *iocb; /* iocb struct for AIO */ 2135b3ff237Sjiayingz@google.com (Jiaying Zhang) int result; /* error value for AIO */ 2144188188bSCurt Wohlgemuth int num_io_pages; /* for writepages() */ 2154188188bSCurt Wohlgemuth struct ext4_io_page *pages[MAX_IO_PAGES]; /* for writepages() */ 2160031462bSMingming Cao } ext4_io_end_t; 2170031462bSMingming Cao 218bd2d0210STheodore Ts'o struct ext4_io_submit { 219bd2d0210STheodore Ts'o int io_op; 220bd2d0210STheodore Ts'o struct bio *io_bio; 221bd2d0210STheodore Ts'o ext4_io_end_t *io_end; 222bd2d0210STheodore Ts'o struct ext4_io_page *io_page; 223bd2d0210STheodore Ts'o sector_t io_next_block; 224bd2d0210STheodore Ts'o }; 225bd2d0210STheodore Ts'o 226b3a3ca8cSTheodore Ts'o /* 2273dcf5451SChristoph Hellwig * Special inodes numbers 2283dcf5451SChristoph Hellwig */ 2293dcf5451SChristoph Hellwig #define EXT4_BAD_INO 1 /* Bad blocks inode */ 2303dcf5451SChristoph Hellwig #define EXT4_ROOT_INO 2 /* Root inode */ 231ae812306SAditya Kali #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 232ae812306SAditya Kali #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 2333dcf5451SChristoph Hellwig #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 2343dcf5451SChristoph Hellwig #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 2353dcf5451SChristoph Hellwig #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 2363dcf5451SChristoph Hellwig #define EXT4_JOURNAL_INO 8 /* Journal inode */ 2373dcf5451SChristoph Hellwig 2383dcf5451SChristoph Hellwig /* First non-reserved inode for old ext4 filesystems */ 2393dcf5451SChristoph Hellwig #define EXT4_GOOD_OLD_FIRST_INO 11 2403dcf5451SChristoph Hellwig 2413dcf5451SChristoph Hellwig /* 2423dcf5451SChristoph Hellwig * Maximal count of links to a file 2433dcf5451SChristoph Hellwig */ 2443dcf5451SChristoph Hellwig #define EXT4_LINK_MAX 65000 2453dcf5451SChristoph Hellwig 2463dcf5451SChristoph Hellwig /* 2473dcf5451SChristoph Hellwig * Macro-instructions used to manage several block sizes 2483dcf5451SChristoph Hellwig */ 2493dcf5451SChristoph Hellwig #define EXT4_MIN_BLOCK_SIZE 1024 2503dcf5451SChristoph Hellwig #define EXT4_MAX_BLOCK_SIZE 65536 2513dcf5451SChristoph Hellwig #define EXT4_MIN_BLOCK_LOG_SIZE 10 252fb1813f4SCurt Wohlgemuth #define EXT4_MAX_BLOCK_LOG_SIZE 16 2533dcf5451SChristoph Hellwig #ifdef __KERNEL__ 2543dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 2553dcf5451SChristoph Hellwig #else 2563dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 2573dcf5451SChristoph Hellwig #endif 2583dcf5451SChristoph Hellwig #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 259281b5995STheodore Ts'o #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 260281b5995STheodore Ts'o EXT4_SB(s)->s_cluster_bits) 2613dcf5451SChristoph Hellwig #ifdef __KERNEL__ 2623dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 263281b5995STheodore Ts'o # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 2643dcf5451SChristoph Hellwig #else 2653dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 2663dcf5451SChristoph Hellwig #endif 2673dcf5451SChristoph Hellwig #ifdef __KERNEL__ 2683dcf5451SChristoph Hellwig #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 2693dcf5451SChristoph Hellwig #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 2703dcf5451SChristoph Hellwig #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 2713dcf5451SChristoph Hellwig #else 2723dcf5451SChristoph Hellwig #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 2733dcf5451SChristoph Hellwig EXT4_GOOD_OLD_INODE_SIZE : \ 2743dcf5451SChristoph Hellwig (s)->s_inode_size) 2753dcf5451SChristoph Hellwig #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 2763dcf5451SChristoph Hellwig EXT4_GOOD_OLD_FIRST_INO : \ 2773dcf5451SChristoph Hellwig (s)->s_first_ino) 2783dcf5451SChristoph Hellwig #endif 2793dcf5451SChristoph Hellwig #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 2803dcf5451SChristoph Hellwig 281d5b8f310STheodore Ts'o /* Translate a block number to a cluster number */ 282d5b8f310STheodore Ts'o #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 283d5b8f310STheodore Ts'o /* Translate a cluster number to a block number */ 284d5b8f310STheodore Ts'o #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 285d5b8f310STheodore Ts'o /* Translate # of blks to # of clusters */ 286d5b8f310STheodore Ts'o #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 287d5b8f310STheodore Ts'o (sbi)->s_cluster_bits) 288d5b8f310STheodore Ts'o 2893dcf5451SChristoph Hellwig /* 2903dcf5451SChristoph Hellwig * Structure of a blocks group descriptor 2913dcf5451SChristoph Hellwig */ 2923dcf5451SChristoph Hellwig struct ext4_group_desc 2933dcf5451SChristoph Hellwig { 2943dcf5451SChristoph Hellwig __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 2953dcf5451SChristoph Hellwig __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 2963dcf5451SChristoph Hellwig __le32 bg_inode_table_lo; /* Inodes table block */ 297560671a0SAneesh Kumar K.V __le16 bg_free_blocks_count_lo;/* Free blocks count */ 298560671a0SAneesh Kumar K.V __le16 bg_free_inodes_count_lo;/* Free inodes count */ 299560671a0SAneesh Kumar K.V __le16 bg_used_dirs_count_lo; /* Directories count */ 3003dcf5451SChristoph Hellwig __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 301e6153918SDarrick J. Wong __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 302e6153918SDarrick J. Wong __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 303e6153918SDarrick J. Wong __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 304560671a0SAneesh Kumar K.V __le16 bg_itable_unused_lo; /* Unused inodes count */ 3053dcf5451SChristoph Hellwig __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 3063dcf5451SChristoph Hellwig __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 3073dcf5451SChristoph Hellwig __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 3083dcf5451SChristoph Hellwig __le32 bg_inode_table_hi; /* Inodes table block MSB */ 3093dcf5451SChristoph Hellwig __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 3103dcf5451SChristoph Hellwig __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 3113dcf5451SChristoph Hellwig __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 3123dcf5451SChristoph Hellwig __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 313e6153918SDarrick J. Wong __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 314e6153918SDarrick J. Wong __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 315e6153918SDarrick J. Wong __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 316e6153918SDarrick J. Wong __u32 bg_reserved; 3173dcf5451SChristoph Hellwig }; 3183dcf5451SChristoph Hellwig 319772cb7c8SJose R. Santos /* 320772cb7c8SJose R. Santos * Structure of a flex block group info 321772cb7c8SJose R. Santos */ 322772cb7c8SJose R. Santos 323772cb7c8SJose R. Santos struct flex_groups { 3249f24e420STheodore Ts'o atomic_t free_inodes; 32524aaa8efSTheodore Ts'o atomic_t free_clusters; 3267d39db14STheodore Ts'o atomic_t used_dirs; 327772cb7c8SJose R. Santos }; 328772cb7c8SJose R. Santos 3293dcf5451SChristoph Hellwig #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 3303dcf5451SChristoph Hellwig #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 3313dcf5451SChristoph Hellwig #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 3323dcf5451SChristoph Hellwig 3333dcf5451SChristoph Hellwig /* 3343dcf5451SChristoph Hellwig * Macro-instructions used to manage group descriptors 3353dcf5451SChristoph Hellwig */ 3363dcf5451SChristoph Hellwig #define EXT4_MIN_DESC_SIZE 32 3373dcf5451SChristoph Hellwig #define EXT4_MIN_DESC_SIZE_64BIT 64 3383dcf5451SChristoph Hellwig #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 3393dcf5451SChristoph Hellwig #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 3403dcf5451SChristoph Hellwig #ifdef __KERNEL__ 3413dcf5451SChristoph Hellwig # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 342281b5995STheodore Ts'o # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 3433dcf5451SChristoph Hellwig # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 3443dcf5451SChristoph Hellwig # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 3453dcf5451SChristoph Hellwig # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 3463dcf5451SChristoph Hellwig #else 3473dcf5451SChristoph Hellwig # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 3483dcf5451SChristoph Hellwig # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 3493dcf5451SChristoph Hellwig # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 3503dcf5451SChristoph Hellwig #endif 3513dcf5451SChristoph Hellwig 3523dcf5451SChristoph Hellwig /* 3533dcf5451SChristoph Hellwig * Constants relative to the data blocks 3543dcf5451SChristoph Hellwig */ 3553dcf5451SChristoph Hellwig #define EXT4_NDIR_BLOCKS 12 3563dcf5451SChristoph Hellwig #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 3573dcf5451SChristoph Hellwig #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 3583dcf5451SChristoph Hellwig #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 3593dcf5451SChristoph Hellwig #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 3603dcf5451SChristoph Hellwig 3613dcf5451SChristoph Hellwig /* 3623dcf5451SChristoph Hellwig * Inode flags 3633dcf5451SChristoph Hellwig */ 3643dcf5451SChristoph Hellwig #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 3653dcf5451SChristoph Hellwig #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 3663dcf5451SChristoph Hellwig #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 3673dcf5451SChristoph Hellwig #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 3683dcf5451SChristoph Hellwig #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 3693dcf5451SChristoph Hellwig #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 3703dcf5451SChristoph Hellwig #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 3713dcf5451SChristoph Hellwig #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 3723dcf5451SChristoph Hellwig /* Reserved for compression usage... */ 3733dcf5451SChristoph Hellwig #define EXT4_DIRTY_FL 0x00000100 3743dcf5451SChristoph Hellwig #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 3753dcf5451SChristoph Hellwig #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 3763dcf5451SChristoph Hellwig #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 3773dcf5451SChristoph Hellwig /* End compression flags --- maybe not all used */ 3783dcf5451SChristoph Hellwig #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 3793dcf5451SChristoph Hellwig #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 3803dcf5451SChristoph Hellwig #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 3813dcf5451SChristoph Hellwig #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 3823dcf5451SChristoph Hellwig #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 3833dcf5451SChristoph Hellwig #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 3843dcf5451SChristoph Hellwig #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 3853dcf5451SChristoph Hellwig #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 386f710b4b9STheodore Ts'o #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 387c8d46e41SJiaying Zhang #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 3883dcf5451SChristoph Hellwig #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 3893dcf5451SChristoph Hellwig 390c8d46e41SJiaying Zhang #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 391c8d46e41SJiaying Zhang #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 3923dcf5451SChristoph Hellwig 3938fa43a81SDuane Griffin /* Flags that should be inherited by new inodes from their parent. */ 3948fa43a81SDuane Griffin #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 3951cd9f097STheodore Ts'o EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 3968fa43a81SDuane Griffin EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 3978fa43a81SDuane Griffin EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 3988fa43a81SDuane Griffin 3992dc6b0d4SDuane Griffin /* Flags that are appropriate for regular files (all but dir-specific ones). */ 4002dc6b0d4SDuane Griffin #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 4012dc6b0d4SDuane Griffin 4022dc6b0d4SDuane Griffin /* Flags that are appropriate for non-directories/regular files. */ 4032dc6b0d4SDuane Griffin #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 4042dc6b0d4SDuane Griffin 4052dc6b0d4SDuane Griffin /* Mask out flags that are inappropriate for the given type of inode. */ 4062dc6b0d4SDuane Griffin static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 4072dc6b0d4SDuane Griffin { 4082dc6b0d4SDuane Griffin if (S_ISDIR(mode)) 4092dc6b0d4SDuane Griffin return flags; 4102dc6b0d4SDuane Griffin else if (S_ISREG(mode)) 4112dc6b0d4SDuane Griffin return flags & EXT4_REG_FLMASK; 4122dc6b0d4SDuane Griffin else 4132dc6b0d4SDuane Griffin return flags & EXT4_OTHER_FLMASK; 4142dc6b0d4SDuane Griffin } 4152dc6b0d4SDuane Griffin 41612e9b892SDmitry Monakhov /* 41712e9b892SDmitry Monakhov * Inode flags used for atomic set/get 41812e9b892SDmitry Monakhov */ 41912e9b892SDmitry Monakhov enum { 42012e9b892SDmitry Monakhov EXT4_INODE_SECRM = 0, /* Secure deletion */ 42112e9b892SDmitry Monakhov EXT4_INODE_UNRM = 1, /* Undelete */ 42212e9b892SDmitry Monakhov EXT4_INODE_COMPR = 2, /* Compress file */ 42312e9b892SDmitry Monakhov EXT4_INODE_SYNC = 3, /* Synchronous updates */ 42412e9b892SDmitry Monakhov EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 42512e9b892SDmitry Monakhov EXT4_INODE_APPEND = 5, /* writes to file may only append */ 42612e9b892SDmitry Monakhov EXT4_INODE_NODUMP = 6, /* do not dump file */ 42712e9b892SDmitry Monakhov EXT4_INODE_NOATIME = 7, /* do not update atime */ 42812e9b892SDmitry Monakhov /* Reserved for compression usage... */ 42912e9b892SDmitry Monakhov EXT4_INODE_DIRTY = 8, 43012e9b892SDmitry Monakhov EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 43112e9b892SDmitry Monakhov EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 43212e9b892SDmitry Monakhov EXT4_INODE_ECOMPR = 11, /* Compression error */ 43312e9b892SDmitry Monakhov /* End compression flags --- maybe not all used */ 43412e9b892SDmitry Monakhov EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 43512e9b892SDmitry Monakhov EXT4_INODE_IMAGIC = 13, /* AFS directory */ 43612e9b892SDmitry Monakhov EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 43712e9b892SDmitry Monakhov EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 43812e9b892SDmitry Monakhov EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 43912e9b892SDmitry Monakhov EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 44012e9b892SDmitry Monakhov EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 44112e9b892SDmitry Monakhov EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 44212e9b892SDmitry Monakhov EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 44312e9b892SDmitry Monakhov EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 44412e9b892SDmitry Monakhov EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 44512e9b892SDmitry Monakhov }; 44612e9b892SDmitry Monakhov 44712e9b892SDmitry Monakhov #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 44812e9b892SDmitry Monakhov #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \ 44912e9b892SDmitry Monakhov printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \ 45012e9b892SDmitry Monakhov EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); } 45112e9b892SDmitry Monakhov 45212e9b892SDmitry Monakhov /* 45312e9b892SDmitry Monakhov * Since it's pretty easy to mix up bit numbers and hex values, and we 45412e9b892SDmitry Monakhov * can't do a compile-time test for ENUM values, we use a run-time 45512e9b892SDmitry Monakhov * test to make sure that EXT4_XXX_FL is consistent with respect to 45612e9b892SDmitry Monakhov * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop 45712e9b892SDmitry Monakhov * out so it won't cost any extra space in the compiled kernel image. 45812e9b892SDmitry Monakhov * But it's important that these values are the same, since we are 45912e9b892SDmitry Monakhov * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL 46012e9b892SDmitry Monakhov * must be consistent with the values of FS_XXX_FL defined in 46112e9b892SDmitry Monakhov * include/linux/fs.h and the on-disk values found in ext2, ext3, and 46212e9b892SDmitry Monakhov * ext4 filesystems, and of course the values defined in e2fsprogs. 46312e9b892SDmitry Monakhov * 46412e9b892SDmitry Monakhov * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 46512e9b892SDmitry Monakhov */ 46612e9b892SDmitry Monakhov static inline void ext4_check_flag_values(void) 46712e9b892SDmitry Monakhov { 46812e9b892SDmitry Monakhov CHECK_FLAG_VALUE(SECRM); 46912e9b892SDmitry Monakhov CHECK_FLAG_VALUE(UNRM); 47012e9b892SDmitry Monakhov CHECK_FLAG_VALUE(COMPR); 47112e9b892SDmitry Monakhov CHECK_FLAG_VALUE(SYNC); 47212e9b892SDmitry Monakhov CHECK_FLAG_VALUE(IMMUTABLE); 47312e9b892SDmitry Monakhov CHECK_FLAG_VALUE(APPEND); 47412e9b892SDmitry Monakhov CHECK_FLAG_VALUE(NODUMP); 47512e9b892SDmitry Monakhov CHECK_FLAG_VALUE(NOATIME); 47612e9b892SDmitry Monakhov CHECK_FLAG_VALUE(DIRTY); 47712e9b892SDmitry Monakhov CHECK_FLAG_VALUE(COMPRBLK); 47812e9b892SDmitry Monakhov CHECK_FLAG_VALUE(NOCOMPR); 47912e9b892SDmitry Monakhov CHECK_FLAG_VALUE(ECOMPR); 48012e9b892SDmitry Monakhov CHECK_FLAG_VALUE(INDEX); 48112e9b892SDmitry Monakhov CHECK_FLAG_VALUE(IMAGIC); 48212e9b892SDmitry Monakhov CHECK_FLAG_VALUE(JOURNAL_DATA); 48312e9b892SDmitry Monakhov CHECK_FLAG_VALUE(NOTAIL); 48412e9b892SDmitry Monakhov CHECK_FLAG_VALUE(DIRSYNC); 48512e9b892SDmitry Monakhov CHECK_FLAG_VALUE(TOPDIR); 48612e9b892SDmitry Monakhov CHECK_FLAG_VALUE(HUGE_FILE); 48712e9b892SDmitry Monakhov CHECK_FLAG_VALUE(EXTENTS); 48812e9b892SDmitry Monakhov CHECK_FLAG_VALUE(EA_INODE); 48912e9b892SDmitry Monakhov CHECK_FLAG_VALUE(EOFBLOCKS); 49012e9b892SDmitry Monakhov CHECK_FLAG_VALUE(RESERVED); 49112e9b892SDmitry Monakhov } 49212e9b892SDmitry Monakhov 4933dcf5451SChristoph Hellwig /* Used to pass group descriptor data when online resize is done */ 4943dcf5451SChristoph Hellwig struct ext4_new_group_input { 4953dcf5451SChristoph Hellwig __u32 group; /* Group number for this data */ 4963dcf5451SChristoph Hellwig __u64 block_bitmap; /* Absolute block number of block bitmap */ 4973dcf5451SChristoph Hellwig __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 4983dcf5451SChristoph Hellwig __u64 inode_table; /* Absolute block number of inode table start */ 4993dcf5451SChristoph Hellwig __u32 blocks_count; /* Total number of blocks in this group */ 5003dcf5451SChristoph Hellwig __u16 reserved_blocks; /* Number of reserved blocks in this group */ 5013dcf5451SChristoph Hellwig __u16 unused; 5023dcf5451SChristoph Hellwig }; 5033dcf5451SChristoph Hellwig 5044d92dc0fSBen Hutchings #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 5054d92dc0fSBen Hutchings struct compat_ext4_new_group_input { 5064d92dc0fSBen Hutchings u32 group; 5074d92dc0fSBen Hutchings compat_u64 block_bitmap; 5084d92dc0fSBen Hutchings compat_u64 inode_bitmap; 5094d92dc0fSBen Hutchings compat_u64 inode_table; 5104d92dc0fSBen Hutchings u32 blocks_count; 5114d92dc0fSBen Hutchings u16 reserved_blocks; 5124d92dc0fSBen Hutchings u16 unused; 5134d92dc0fSBen Hutchings }; 5144d92dc0fSBen Hutchings #endif 5154d92dc0fSBen Hutchings 5163dcf5451SChristoph Hellwig /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 5173dcf5451SChristoph Hellwig struct ext4_new_group_data { 5183dcf5451SChristoph Hellwig __u32 group; 5193dcf5451SChristoph Hellwig __u64 block_bitmap; 5203dcf5451SChristoph Hellwig __u64 inode_bitmap; 5213dcf5451SChristoph Hellwig __u64 inode_table; 5223dcf5451SChristoph Hellwig __u32 blocks_count; 5233dcf5451SChristoph Hellwig __u16 reserved_blocks; 5243dcf5451SChristoph Hellwig __u16 unused; 5253dcf5451SChristoph Hellwig __u32 free_blocks_count; 5263dcf5451SChristoph Hellwig }; 5273dcf5451SChristoph Hellwig 52833afdcc5SYongqiang Yang /* Indexes used to index group tables in ext4_new_group_data */ 52933afdcc5SYongqiang Yang enum { 53033afdcc5SYongqiang Yang BLOCK_BITMAP = 0, /* block bitmap */ 53133afdcc5SYongqiang Yang INODE_BITMAP, /* inode bitmap */ 53233afdcc5SYongqiang Yang INODE_TABLE, /* inode tables */ 53333afdcc5SYongqiang Yang GROUP_TABLE_COUNT, 53433afdcc5SYongqiang Yang }; 53533afdcc5SYongqiang Yang 5363dcf5451SChristoph Hellwig /* 53779e83036SEric Sandeen * Flags used by ext4_map_blocks() 5383dcf5451SChristoph Hellwig */ 539c2177057STheodore Ts'o /* Allocate any needed blocks and/or convert an unitialized 540c2177057STheodore Ts'o extent to be an initialized ext4 */ 5412ac3b6e0STheodore Ts'o #define EXT4_GET_BLOCKS_CREATE 0x0001 542c2177057STheodore Ts'o /* Request the creation of an unitialized extent */ 5432ac3b6e0STheodore Ts'o #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 544c2177057STheodore Ts'o #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 545c2177057STheodore Ts'o EXT4_GET_BLOCKS_CREATE) 546c2177057STheodore Ts'o /* Caller is from the delayed allocation writeout path, 5472ac3b6e0STheodore Ts'o so set the magic i_delalloc_reserve_flag after taking the 5482ac3b6e0STheodore Ts'o inode allocation semaphore for */ 54903f5d8bcSJan Kara #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 5500031462bSMingming Cao /* caller is from the direct IO path, request to creation of an 5510031462bSMingming Cao unitialized extents if not allocated, split the uninitialized 5520031462bSMingming Cao extent if blocks has been preallocated already*/ 553c7064ef1SJiaying Zhang #define EXT4_GET_BLOCKS_PRE_IO 0x0008 5541296cc85SAneesh Kumar K.V #define EXT4_GET_BLOCKS_CONVERT 0x0010 555c7064ef1SJiaying Zhang #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 5560031462bSMingming Cao EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 557c7064ef1SJiaying Zhang /* Convert extent to initialized after IO complete */ 558c7064ef1SJiaying Zhang #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 559744692dcSJiaying Zhang EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 56055f020dbSAllison Henderson /* Punch out blocks of an extent */ 56155f020dbSAllison Henderson #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020 562556b27abSVivek Haldar /* Don't normalize allocation size (used for fallocate) */ 563556b27abSVivek Haldar #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 564a4e5d88bSDmitry Monakhov /* Request will not result in inode size update (user for fallocate) */ 565a4e5d88bSDmitry Monakhov #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 5663dcf5451SChristoph Hellwig 5673dcf5451SChristoph Hellwig /* 568e6362609STheodore Ts'o * Flags used by ext4_free_blocks 569e6362609STheodore Ts'o */ 570e6362609STheodore Ts'o #define EXT4_FREE_BLOCKS_METADATA 0x0001 571e6362609STheodore Ts'o #define EXT4_FREE_BLOCKS_FORGET 0x0002 5721f2acb60STheodore Ts'o #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 5737132de74SMaxim Patlasov #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 57484130193STheodore Ts'o #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 57584130193STheodore Ts'o #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 576e6362609STheodore Ts'o 577e6362609STheodore Ts'o /* 5784e96b2dbSAllison Henderson * Flags used by ext4_discard_partial_page_buffers 5794e96b2dbSAllison Henderson */ 5804e96b2dbSAllison Henderson #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001 5813dcf5451SChristoph Hellwig 5823dcf5451SChristoph Hellwig /* 5833dcf5451SChristoph Hellwig * ioctl commands 5843dcf5451SChristoph Hellwig */ 5853dcf5451SChristoph Hellwig #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 5863dcf5451SChristoph Hellwig #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 5873dcf5451SChristoph Hellwig #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 5883dcf5451SChristoph Hellwig #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 5893dcf5451SChristoph Hellwig #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 5903dcf5451SChristoph Hellwig #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 5913dcf5451SChristoph Hellwig #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 5923dcf5451SChristoph Hellwig #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 5938eea80d5STheodore Ts'o #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 5948eea80d5STheodore Ts'o #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 5958eea80d5STheodore Ts'o #define EXT4_IOC_MIGRATE _IO('f', 9) 596ccd2506bSTheodore Ts'o /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 5978eea80d5STheodore Ts'o /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 598ccd2506bSTheodore Ts'o #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 599748de673SAkira Fujita #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 60019c5246dSYongqiang Yang #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 6013dcf5451SChristoph Hellwig 602899ad0ceSBen Hutchings #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 6033dcf5451SChristoph Hellwig /* 6043dcf5451SChristoph Hellwig * ioctl commands in 32 bit emulation 6053dcf5451SChristoph Hellwig */ 6063dcf5451SChristoph Hellwig #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 6073dcf5451SChristoph Hellwig #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 6083dcf5451SChristoph Hellwig #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 6093dcf5451SChristoph Hellwig #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 6103dcf5451SChristoph Hellwig #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 6113dcf5451SChristoph Hellwig #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 6123dcf5451SChristoph Hellwig #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 6134d92dc0fSBen Hutchings #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 6143dcf5451SChristoph Hellwig #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 6153dcf5451SChristoph Hellwig #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 616899ad0ceSBen Hutchings #endif 6173dcf5451SChristoph Hellwig 618b595076aSUwe Kleine-König /* Max physical block we can address w/o extents */ 619fb0a387dSEric Sandeen #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 620fb0a387dSEric Sandeen 6213dcf5451SChristoph Hellwig /* 6223dcf5451SChristoph Hellwig * Structure of an inode on the disk 6233dcf5451SChristoph Hellwig */ 6243dcf5451SChristoph Hellwig struct ext4_inode { 6253dcf5451SChristoph Hellwig __le16 i_mode; /* File mode */ 6263dcf5451SChristoph Hellwig __le16 i_uid; /* Low 16 bits of Owner Uid */ 6273dcf5451SChristoph Hellwig __le32 i_size_lo; /* Size in bytes */ 6283dcf5451SChristoph Hellwig __le32 i_atime; /* Access time */ 6293dcf5451SChristoph Hellwig __le32 i_ctime; /* Inode Change time */ 6303dcf5451SChristoph Hellwig __le32 i_mtime; /* Modification time */ 6313dcf5451SChristoph Hellwig __le32 i_dtime; /* Deletion Time */ 6323dcf5451SChristoph Hellwig __le16 i_gid; /* Low 16 bits of Group Id */ 6333dcf5451SChristoph Hellwig __le16 i_links_count; /* Links count */ 6343dcf5451SChristoph Hellwig __le32 i_blocks_lo; /* Blocks count */ 6353dcf5451SChristoph Hellwig __le32 i_flags; /* File flags */ 6363dcf5451SChristoph Hellwig union { 6373dcf5451SChristoph Hellwig struct { 6383dcf5451SChristoph Hellwig __le32 l_i_version; 6393dcf5451SChristoph Hellwig } linux1; 6403dcf5451SChristoph Hellwig struct { 6413dcf5451SChristoph Hellwig __u32 h_i_translator; 6423dcf5451SChristoph Hellwig } hurd1; 6433dcf5451SChristoph Hellwig struct { 6443dcf5451SChristoph Hellwig __u32 m_i_reserved1; 6453dcf5451SChristoph Hellwig } masix1; 6463dcf5451SChristoph Hellwig } osd1; /* OS dependent 1 */ 6473dcf5451SChristoph Hellwig __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 6483dcf5451SChristoph Hellwig __le32 i_generation; /* File version (for NFS) */ 6493dcf5451SChristoph Hellwig __le32 i_file_acl_lo; /* File ACL */ 6503dcf5451SChristoph Hellwig __le32 i_size_high; 6513dcf5451SChristoph Hellwig __le32 i_obso_faddr; /* Obsoleted fragment address */ 6523dcf5451SChristoph Hellwig union { 6533dcf5451SChristoph Hellwig struct { 6543dcf5451SChristoph Hellwig __le16 l_i_blocks_high; /* were l_i_reserved1 */ 6553dcf5451SChristoph Hellwig __le16 l_i_file_acl_high; 6563dcf5451SChristoph Hellwig __le16 l_i_uid_high; /* these 2 fields */ 6573dcf5451SChristoph Hellwig __le16 l_i_gid_high; /* were reserved2[0] */ 658e6153918SDarrick J. Wong __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 659e6153918SDarrick J. Wong __le16 l_i_reserved; 6603dcf5451SChristoph Hellwig } linux2; 6613dcf5451SChristoph Hellwig struct { 6623dcf5451SChristoph Hellwig __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 6633dcf5451SChristoph Hellwig __u16 h_i_mode_high; 6643dcf5451SChristoph Hellwig __u16 h_i_uid_high; 6653dcf5451SChristoph Hellwig __u16 h_i_gid_high; 6663dcf5451SChristoph Hellwig __u32 h_i_author; 6673dcf5451SChristoph Hellwig } hurd2; 6683dcf5451SChristoph Hellwig struct { 6693dcf5451SChristoph Hellwig __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 6703dcf5451SChristoph Hellwig __le16 m_i_file_acl_high; 6713dcf5451SChristoph Hellwig __u32 m_i_reserved2[2]; 6723dcf5451SChristoph Hellwig } masix2; 6733dcf5451SChristoph Hellwig } osd2; /* OS dependent 2 */ 6743dcf5451SChristoph Hellwig __le16 i_extra_isize; 675e6153918SDarrick J. Wong __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 6763dcf5451SChristoph Hellwig __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 6773dcf5451SChristoph Hellwig __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 6783dcf5451SChristoph Hellwig __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 6793dcf5451SChristoph Hellwig __le32 i_crtime; /* File Creation time */ 6803dcf5451SChristoph Hellwig __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 6813dcf5451SChristoph Hellwig __le32 i_version_hi; /* high 32 bits for 64-bit version */ 6823dcf5451SChristoph Hellwig }; 6833dcf5451SChristoph Hellwig 684748de673SAkira Fujita struct move_extent { 685748de673SAkira Fujita __u32 reserved; /* should be zero */ 686748de673SAkira Fujita __u32 donor_fd; /* donor file descriptor */ 687748de673SAkira Fujita __u64 orig_start; /* logical start offset in block for orig */ 688748de673SAkira Fujita __u64 donor_start; /* logical start offset in block for donor */ 689748de673SAkira Fujita __u64 len; /* block length to be moved */ 690748de673SAkira Fujita __u64 moved_len; /* moved block length */ 691748de673SAkira Fujita }; 6923dcf5451SChristoph Hellwig 6933dcf5451SChristoph Hellwig #define EXT4_EPOCH_BITS 2 6943dcf5451SChristoph Hellwig #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 6953dcf5451SChristoph Hellwig #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 6963dcf5451SChristoph Hellwig 6973dcf5451SChristoph Hellwig /* 6983dcf5451SChristoph Hellwig * Extended fields will fit into an inode if the filesystem was formatted 6993dcf5451SChristoph Hellwig * with large inodes (-I 256 or larger) and there are not currently any EAs 7003dcf5451SChristoph Hellwig * consuming all of the available space. For new inodes we always reserve 7013dcf5451SChristoph Hellwig * enough space for the kernel's known extended fields, but for inodes 7023dcf5451SChristoph Hellwig * created with an old kernel this might not have been the case. None of 7033dcf5451SChristoph Hellwig * the extended inode fields is critical for correct filesystem operation. 7043dcf5451SChristoph Hellwig * This macro checks if a certain field fits in the inode. Note that 7053dcf5451SChristoph Hellwig * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 7063dcf5451SChristoph Hellwig */ 7073dcf5451SChristoph Hellwig #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 7083dcf5451SChristoph Hellwig ((offsetof(typeof(*ext4_inode), field) + \ 7093dcf5451SChristoph Hellwig sizeof((ext4_inode)->field)) \ 7103dcf5451SChristoph Hellwig <= (EXT4_GOOD_OLD_INODE_SIZE + \ 7113dcf5451SChristoph Hellwig (einode)->i_extra_isize)) \ 7123dcf5451SChristoph Hellwig 7133dcf5451SChristoph Hellwig static inline __le32 ext4_encode_extra_time(struct timespec *time) 7143dcf5451SChristoph Hellwig { 7153dcf5451SChristoph Hellwig return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 716c1fccc06STheodore Ts'o (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 717c1fccc06STheodore Ts'o ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 7183dcf5451SChristoph Hellwig } 7193dcf5451SChristoph Hellwig 7203dcf5451SChristoph Hellwig static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 7213dcf5451SChristoph Hellwig { 7223dcf5451SChristoph Hellwig if (sizeof(time->tv_sec) > 4) 7233dcf5451SChristoph Hellwig time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 7243dcf5451SChristoph Hellwig << 32; 725c1fccc06STheodore Ts'o time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 7263dcf5451SChristoph Hellwig } 7273dcf5451SChristoph Hellwig 7283dcf5451SChristoph Hellwig #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 7293dcf5451SChristoph Hellwig do { \ 7303dcf5451SChristoph Hellwig (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 7313dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 7323dcf5451SChristoph Hellwig (raw_inode)->xtime ## _extra = \ 7333dcf5451SChristoph Hellwig ext4_encode_extra_time(&(inode)->xtime); \ 7343dcf5451SChristoph Hellwig } while (0) 7353dcf5451SChristoph Hellwig 7363dcf5451SChristoph Hellwig #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 7373dcf5451SChristoph Hellwig do { \ 7383dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 7393dcf5451SChristoph Hellwig (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 7403dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 7413dcf5451SChristoph Hellwig (raw_inode)->xtime ## _extra = \ 7423dcf5451SChristoph Hellwig ext4_encode_extra_time(&(einode)->xtime); \ 7433dcf5451SChristoph Hellwig } while (0) 7443dcf5451SChristoph Hellwig 7453dcf5451SChristoph Hellwig #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 7463dcf5451SChristoph Hellwig do { \ 7473dcf5451SChristoph Hellwig (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 7483dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 7493dcf5451SChristoph Hellwig ext4_decode_extra_time(&(inode)->xtime, \ 7503dcf5451SChristoph Hellwig raw_inode->xtime ## _extra); \ 751af0b44a1SEric Sandeen else \ 752af0b44a1SEric Sandeen (inode)->xtime.tv_nsec = 0; \ 7533dcf5451SChristoph Hellwig } while (0) 7543dcf5451SChristoph Hellwig 7553dcf5451SChristoph Hellwig #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 7563dcf5451SChristoph Hellwig do { \ 7573dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 7583dcf5451SChristoph Hellwig (einode)->xtime.tv_sec = \ 7593dcf5451SChristoph Hellwig (signed)le32_to_cpu((raw_inode)->xtime); \ 7603dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 7613dcf5451SChristoph Hellwig ext4_decode_extra_time(&(einode)->xtime, \ 7623dcf5451SChristoph Hellwig raw_inode->xtime ## _extra); \ 763af0b44a1SEric Sandeen else \ 764af0b44a1SEric Sandeen (einode)->xtime.tv_nsec = 0; \ 7653dcf5451SChristoph Hellwig } while (0) 7663dcf5451SChristoph Hellwig 7673dcf5451SChristoph Hellwig #define i_disk_version osd1.linux1.l_i_version 7683dcf5451SChristoph Hellwig 7693dcf5451SChristoph Hellwig #if defined(__KERNEL__) || defined(__linux__) 7703dcf5451SChristoph Hellwig #define i_reserved1 osd1.linux1.l_i_reserved1 7713dcf5451SChristoph Hellwig #define i_file_acl_high osd2.linux2.l_i_file_acl_high 7723dcf5451SChristoph Hellwig #define i_blocks_high osd2.linux2.l_i_blocks_high 7733dcf5451SChristoph Hellwig #define i_uid_low i_uid 7743dcf5451SChristoph Hellwig #define i_gid_low i_gid 7753dcf5451SChristoph Hellwig #define i_uid_high osd2.linux2.l_i_uid_high 7763dcf5451SChristoph Hellwig #define i_gid_high osd2.linux2.l_i_gid_high 777e6153918SDarrick J. Wong #define i_checksum_lo osd2.linux2.l_i_checksum_lo 7783dcf5451SChristoph Hellwig 7793dcf5451SChristoph Hellwig #elif defined(__GNU__) 7803dcf5451SChristoph Hellwig 7813dcf5451SChristoph Hellwig #define i_translator osd1.hurd1.h_i_translator 7823dcf5451SChristoph Hellwig #define i_uid_high osd2.hurd2.h_i_uid_high 7833dcf5451SChristoph Hellwig #define i_gid_high osd2.hurd2.h_i_gid_high 7843dcf5451SChristoph Hellwig #define i_author osd2.hurd2.h_i_author 7853dcf5451SChristoph Hellwig 7863dcf5451SChristoph Hellwig #elif defined(__masix__) 7873dcf5451SChristoph Hellwig 7883dcf5451SChristoph Hellwig #define i_reserved1 osd1.masix1.m_i_reserved1 7893dcf5451SChristoph Hellwig #define i_file_acl_high osd2.masix2.m_i_file_acl_high 7903dcf5451SChristoph Hellwig #define i_reserved2 osd2.masix2.m_i_reserved2 7913dcf5451SChristoph Hellwig 7923dcf5451SChristoph Hellwig #endif /* defined(__KERNEL__) || defined(__linux__) */ 7933dcf5451SChristoph Hellwig 7943dcf5451SChristoph Hellwig /* 795d444c3c3STheodore Ts'o * storage for cached extent 796b05e6ae5STheodore Ts'o * If ec_len == 0, then the cache is invalid. 797b05e6ae5STheodore Ts'o * If ec_start == 0, then the cache represents a gap (null mapping) 798d444c3c3STheodore Ts'o */ 799d444c3c3STheodore Ts'o struct ext4_ext_cache { 800d444c3c3STheodore Ts'o ext4_fsblk_t ec_start; 801d444c3c3STheodore Ts'o ext4_lblk_t ec_block; 802d444c3c3STheodore Ts'o __u32 ec_len; /* must be 32bit to return holes */ 803d444c3c3STheodore Ts'o }; 804d444c3c3STheodore Ts'o 805d444c3c3STheodore Ts'o /* 806d444c3c3STheodore Ts'o * fourth extended file system inode data in memory 807d444c3c3STheodore Ts'o */ 808d444c3c3STheodore Ts'o struct ext4_inode_info { 809d444c3c3STheodore Ts'o __le32 i_data[15]; /* unconverted */ 810d444c3c3STheodore Ts'o __u32 i_dtime; 81112e9b892SDmitry Monakhov ext4_fsblk_t i_file_acl; 812d444c3c3STheodore Ts'o 813d444c3c3STheodore Ts'o /* 814d444c3c3STheodore Ts'o * i_block_group is the number of the block group which contains 815d444c3c3STheodore Ts'o * this file's inode. Constant across the lifetime of the inode, 816d444c3c3STheodore Ts'o * it is ued for making block allocation decisions - we try to 817d444c3c3STheodore Ts'o * place a file's data blocks near its inode block, and new inodes 818d444c3c3STheodore Ts'o * near to their parent directory's inode. 819d444c3c3STheodore Ts'o */ 820d444c3c3STheodore Ts'o ext4_group_t i_block_group; 8218a2005d3STheodore Ts'o ext4_lblk_t i_dir_start_lookup; 822353eb83cSTheodore Ts'o #if (BITS_PER_LONG < 64) 82319f5fb7aSTheodore Ts'o unsigned long i_state_flags; /* Dynamic state flags */ 824353eb83cSTheodore Ts'o #endif 82512e9b892SDmitry Monakhov unsigned long i_flags; 826d444c3c3STheodore Ts'o 827d444c3c3STheodore Ts'o #ifdef CONFIG_EXT4_FS_XATTR 828d444c3c3STheodore Ts'o /* 829d444c3c3STheodore Ts'o * Extended attributes can be read independently of the main file 830d444c3c3STheodore Ts'o * data. Taking i_mutex even when reading would cause contention 831d444c3c3STheodore Ts'o * between readers of EAs and writers of regular file data, so 832d444c3c3STheodore Ts'o * instead we synchronize on xattr_sem when reading or changing 833d444c3c3STheodore Ts'o * EAs. 834d444c3c3STheodore Ts'o */ 835d444c3c3STheodore Ts'o struct rw_semaphore xattr_sem; 836d444c3c3STheodore Ts'o #endif 837d444c3c3STheodore Ts'o 838d444c3c3STheodore Ts'o struct list_head i_orphan; /* unlinked but open inodes */ 839d444c3c3STheodore Ts'o 840d444c3c3STheodore Ts'o /* 841d444c3c3STheodore Ts'o * i_disksize keeps track of what the inode size is ON DISK, not 842d444c3c3STheodore Ts'o * in memory. During truncate, i_size is set to the new size by 843d444c3c3STheodore Ts'o * the VFS prior to calling ext4_truncate(), but the filesystem won't 844d444c3c3STheodore Ts'o * set i_disksize to 0 until the truncate is actually under way. 845d444c3c3STheodore Ts'o * 846d444c3c3STheodore Ts'o * The intent is that i_disksize always represents the blocks which 847d444c3c3STheodore Ts'o * are used by this file. This allows recovery to restart truncate 848d444c3c3STheodore Ts'o * on orphans if we crash during truncate. We actually write i_disksize 849d444c3c3STheodore Ts'o * into the on-disk inode when writing inodes out, instead of i_size. 850d444c3c3STheodore Ts'o * 851d444c3c3STheodore Ts'o * The only time when i_disksize and i_size may be different is when 852d444c3c3STheodore Ts'o * a truncate is in progress. The only things which change i_disksize 853d444c3c3STheodore Ts'o * are ext4_get_block (growth) and ext4_truncate (shrinkth). 854d444c3c3STheodore Ts'o */ 855d444c3c3STheodore Ts'o loff_t i_disksize; 856d444c3c3STheodore Ts'o 857d444c3c3STheodore Ts'o /* 858d444c3c3STheodore Ts'o * i_data_sem is for serialising ext4_truncate() against 859d444c3c3STheodore Ts'o * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 860d444c3c3STheodore Ts'o * data tree are chopped off during truncate. We can't do that in 861d444c3c3STheodore Ts'o * ext4 because whenever we perform intermediate commits during 862d444c3c3STheodore Ts'o * truncate, the inode and all the metadata blocks *must* be in a 863d444c3c3STheodore Ts'o * consistent state which allows truncation of the orphans to restart 864d444c3c3STheodore Ts'o * during recovery. Hence we must fix the get_block-vs-truncate race 865d444c3c3STheodore Ts'o * by other means, so we have i_data_sem. 866d444c3c3STheodore Ts'o */ 867d444c3c3STheodore Ts'o struct rw_semaphore i_data_sem; 868d444c3c3STheodore Ts'o struct inode vfs_inode; 8698aefcd55STheodore Ts'o struct jbd2_inode *jinode; 870d444c3c3STheodore Ts'o 871d444c3c3STheodore Ts'o struct ext4_ext_cache i_cached_extent; 872d444c3c3STheodore Ts'o /* 873d444c3c3STheodore Ts'o * File creation time. Its function is same as that of 874d444c3c3STheodore Ts'o * struct timespec i_{a,c,m}time in the generic inode. 875d444c3c3STheodore Ts'o */ 876d444c3c3STheodore Ts'o struct timespec i_crtime; 877d444c3c3STheodore Ts'o 878d444c3c3STheodore Ts'o /* mballoc */ 879d444c3c3STheodore Ts'o struct list_head i_prealloc_list; 880d444c3c3STheodore Ts'o spinlock_t i_prealloc_lock; 881d444c3c3STheodore Ts'o 882d444c3c3STheodore Ts'o /* ialloc */ 883d444c3c3STheodore Ts'o ext4_group_t i_last_alloc_group; 884d444c3c3STheodore Ts'o 885d444c3c3STheodore Ts'o /* allocation reservation info for delalloc */ 88657042651STheodore Ts'o /* In case of bigalloc, these refer to clusters rather than blocks */ 887d444c3c3STheodore Ts'o unsigned int i_reserved_data_blocks; 888d444c3c3STheodore Ts'o unsigned int i_reserved_meta_blocks; 889d444c3c3STheodore Ts'o unsigned int i_allocated_meta_blocks; 89001f49d0bSTheodore Ts'o ext4_lblk_t i_da_metadata_calc_last_lblock; 8919d0be502STheodore Ts'o int i_da_metadata_calc_len; 892d444c3c3STheodore Ts'o 893d444c3c3STheodore Ts'o /* on-disk additional length */ 894d444c3c3STheodore Ts'o __u16 i_extra_isize; 895d444c3c3STheodore Ts'o 896a9e7f447SDmitry Monakhov #ifdef CONFIG_QUOTA 897a9e7f447SDmitry Monakhov /* quota space reservation, managed internally by quota code */ 898a9e7f447SDmitry Monakhov qsize_t i_reserved_quota; 899a9e7f447SDmitry Monakhov #endif 9008d5d02e6SMingming Cao 901c7064ef1SJiaying Zhang /* completed IOs that might need unwritten extents handling */ 902c7064ef1SJiaying Zhang struct list_head i_completed_io_list; 903744692dcSJiaying Zhang spinlock_t i_completed_io_lock; 9048a2005d3STheodore Ts'o atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 9058d5d02e6SMingming Cao /* current io_end structure for async DIO write*/ 9068d5d02e6SMingming Cao ext4_io_end_t *cur_aio_dio; 907e9e3bcecSEric Sandeen atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */ 9088a2005d3STheodore Ts'o 9098a2005d3STheodore Ts'o spinlock_t i_block_reservation_lock; 910b436b9beSJan Kara 911b436b9beSJan Kara /* 912b436b9beSJan Kara * Transactions that contain inode's metadata needed to complete 913b436b9beSJan Kara * fsync and fdatasync, respectively. 914b436b9beSJan Kara */ 915b436b9beSJan Kara tid_t i_sync_tid; 916b436b9beSJan Kara tid_t i_datasync_tid; 917d444c3c3STheodore Ts'o }; 918d444c3c3STheodore Ts'o 919d444c3c3STheodore Ts'o /* 9203dcf5451SChristoph Hellwig * File system states 9213dcf5451SChristoph Hellwig */ 9223dcf5451SChristoph Hellwig #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 9233dcf5451SChristoph Hellwig #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 9243dcf5451SChristoph Hellwig #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 9253dcf5451SChristoph Hellwig 9263dcf5451SChristoph Hellwig /* 9273dcf5451SChristoph Hellwig * Misc. filesystem flags 9283dcf5451SChristoph Hellwig */ 9293dcf5451SChristoph Hellwig #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 9303dcf5451SChristoph Hellwig #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 9313dcf5451SChristoph Hellwig #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 9323dcf5451SChristoph Hellwig 9333dcf5451SChristoph Hellwig /* 9343dcf5451SChristoph Hellwig * Mount flags 9353dcf5451SChristoph Hellwig */ 9363dcf5451SChristoph Hellwig #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 9373dcf5451SChristoph Hellwig #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 9383dcf5451SChristoph Hellwig #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 9393dcf5451SChristoph Hellwig #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 9403dcf5451SChristoph Hellwig #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 94139ef17f1STheodore Ts'o #define EXT4_MOUNT_ERRORS_MASK 0x00070 9423dcf5451SChristoph Hellwig #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 9433dcf5451SChristoph Hellwig #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 9443dcf5451SChristoph Hellwig #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 9453dcf5451SChristoph Hellwig #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 9463dcf5451SChristoph Hellwig #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 9473dcf5451SChristoph Hellwig #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 9483dcf5451SChristoph Hellwig #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 9493dcf5451SChristoph Hellwig #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 9503dcf5451SChristoph Hellwig #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 9513dcf5451SChristoph Hellwig #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 952afd4672dSTheodore Ts'o #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 9533dcf5451SChristoph Hellwig #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 9543dcf5451SChristoph Hellwig #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 9553dcf5451SChristoph Hellwig #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 9563dcf5451SChristoph Hellwig #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 957744692dcSJiaying Zhang #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 958d4da6c9cSLinus Torvalds #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 9593dcf5451SChristoph Hellwig #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 9601449032bSTheodore Ts'o #define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */ 96164769240SAlex Tomas #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 9625bf5683aSHidehiro Kawai #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 9636fd058f7STheodore Ts'o #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 9645328e635SEric Sandeen #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 965bfff6873SLukas Czerner #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 9665bf5683aSHidehiro Kawai 96756889787STheodore Ts'o #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 96856889787STheodore Ts'o specified delalloc */ 96956889787STheodore Ts'o 970fd8c37ecSTheodore Ts'o #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 971fd8c37ecSTheodore Ts'o ~EXT4_MOUNT_##opt 972fd8c37ecSTheodore Ts'o #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 973fd8c37ecSTheodore Ts'o EXT4_MOUNT_##opt 9743dcf5451SChristoph Hellwig #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 9753dcf5451SChristoph Hellwig EXT4_MOUNT_##opt) 9763dcf5451SChristoph Hellwig 977a2595b8aSTheodore Ts'o #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 978a2595b8aSTheodore Ts'o ~EXT4_MOUNT2_##opt 979a2595b8aSTheodore Ts'o #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 980a2595b8aSTheodore Ts'o EXT4_MOUNT2_##opt 981a2595b8aSTheodore Ts'o #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 982a2595b8aSTheodore Ts'o EXT4_MOUNT2_##opt) 983a2595b8aSTheodore Ts'o 984597d508cSAkinobu Mita #define ext4_test_and_set_bit __test_and_set_bit_le 985597d508cSAkinobu Mita #define ext4_set_bit __set_bit_le 9863dcf5451SChristoph Hellwig #define ext4_set_bit_atomic ext2_set_bit_atomic 987597d508cSAkinobu Mita #define ext4_test_and_clear_bit __test_and_clear_bit_le 988597d508cSAkinobu Mita #define ext4_clear_bit __clear_bit_le 9893dcf5451SChristoph Hellwig #define ext4_clear_bit_atomic ext2_clear_bit_atomic 99050e0168cSAkinobu Mita #define ext4_test_bit test_bit_le 99150e0168cSAkinobu Mita #define ext4_find_next_zero_bit find_next_zero_bit_le 99250e0168cSAkinobu Mita #define ext4_find_next_bit find_next_bit_le 9933dcf5451SChristoph Hellwig 994c3e94d1dSYongqiang Yang extern void ext4_set_bits(void *bm, int cur, int len); 995c3e94d1dSYongqiang Yang 9963dcf5451SChristoph Hellwig /* 9973dcf5451SChristoph Hellwig * Maximal mount counts between two filesystem checks 9983dcf5451SChristoph Hellwig */ 9993dcf5451SChristoph Hellwig #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 10003dcf5451SChristoph Hellwig #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 10013dcf5451SChristoph Hellwig 10023dcf5451SChristoph Hellwig /* 10033dcf5451SChristoph Hellwig * Behaviour when detecting errors 10043dcf5451SChristoph Hellwig */ 10053dcf5451SChristoph Hellwig #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 10063dcf5451SChristoph Hellwig #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 10073dcf5451SChristoph Hellwig #define EXT4_ERRORS_PANIC 3 /* Panic */ 10083dcf5451SChristoph Hellwig #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 10093dcf5451SChristoph Hellwig 1010e6153918SDarrick J. Wong /* Metadata checksum algorithm codes */ 1011e6153918SDarrick J. Wong #define EXT4_CRC32C_CHKSUM 1 1012e6153918SDarrick J. Wong 10133dcf5451SChristoph Hellwig /* 10143dcf5451SChristoph Hellwig * Structure of the super block 10153dcf5451SChristoph Hellwig */ 10163dcf5451SChristoph Hellwig struct ext4_super_block { 10173dcf5451SChristoph Hellwig /*00*/ __le32 s_inodes_count; /* Inodes count */ 10183dcf5451SChristoph Hellwig __le32 s_blocks_count_lo; /* Blocks count */ 10193dcf5451SChristoph Hellwig __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 10203dcf5451SChristoph Hellwig __le32 s_free_blocks_count_lo; /* Free blocks count */ 10213dcf5451SChristoph Hellwig /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 10223dcf5451SChristoph Hellwig __le32 s_first_data_block; /* First Data Block */ 10233dcf5451SChristoph Hellwig __le32 s_log_block_size; /* Block size */ 1024281b5995STheodore Ts'o __le32 s_log_cluster_size; /* Allocation cluster size */ 10253dcf5451SChristoph Hellwig /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1026281b5995STheodore Ts'o __le32 s_clusters_per_group; /* # Clusters per group */ 10273dcf5451SChristoph Hellwig __le32 s_inodes_per_group; /* # Inodes per group */ 10283dcf5451SChristoph Hellwig __le32 s_mtime; /* Mount time */ 10293dcf5451SChristoph Hellwig /*30*/ __le32 s_wtime; /* Write time */ 10303dcf5451SChristoph Hellwig __le16 s_mnt_count; /* Mount count */ 10313dcf5451SChristoph Hellwig __le16 s_max_mnt_count; /* Maximal mount count */ 10323dcf5451SChristoph Hellwig __le16 s_magic; /* Magic signature */ 10333dcf5451SChristoph Hellwig __le16 s_state; /* File system state */ 10343dcf5451SChristoph Hellwig __le16 s_errors; /* Behaviour when detecting errors */ 10353dcf5451SChristoph Hellwig __le16 s_minor_rev_level; /* minor revision level */ 10363dcf5451SChristoph Hellwig /*40*/ __le32 s_lastcheck; /* time of last check */ 10373dcf5451SChristoph Hellwig __le32 s_checkinterval; /* max. time between checks */ 10383dcf5451SChristoph Hellwig __le32 s_creator_os; /* OS */ 10393dcf5451SChristoph Hellwig __le32 s_rev_level; /* Revision level */ 10403dcf5451SChristoph Hellwig /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 10413dcf5451SChristoph Hellwig __le16 s_def_resgid; /* Default gid for reserved blocks */ 10423dcf5451SChristoph Hellwig /* 10433dcf5451SChristoph Hellwig * These fields are for EXT4_DYNAMIC_REV superblocks only. 10443dcf5451SChristoph Hellwig * 10453dcf5451SChristoph Hellwig * Note: the difference between the compatible feature set and 10463dcf5451SChristoph Hellwig * the incompatible feature set is that if there is a bit set 10473dcf5451SChristoph Hellwig * in the incompatible feature set that the kernel doesn't 10483dcf5451SChristoph Hellwig * know about, it should refuse to mount the filesystem. 10493dcf5451SChristoph Hellwig * 10503dcf5451SChristoph Hellwig * e2fsck's requirements are more strict; if it doesn't know 10513dcf5451SChristoph Hellwig * about a feature in either the compatible or incompatible 10523dcf5451SChristoph Hellwig * feature set, it must abort and not try to meddle with 10533dcf5451SChristoph Hellwig * things it doesn't understand... 10543dcf5451SChristoph Hellwig */ 10553dcf5451SChristoph Hellwig __le32 s_first_ino; /* First non-reserved inode */ 10563dcf5451SChristoph Hellwig __le16 s_inode_size; /* size of inode structure */ 10573dcf5451SChristoph Hellwig __le16 s_block_group_nr; /* block group # of this superblock */ 10583dcf5451SChristoph Hellwig __le32 s_feature_compat; /* compatible feature set */ 10593dcf5451SChristoph Hellwig /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 10603dcf5451SChristoph Hellwig __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 10613dcf5451SChristoph Hellwig /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 10623dcf5451SChristoph Hellwig /*78*/ char s_volume_name[16]; /* volume name */ 10633dcf5451SChristoph Hellwig /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 10643dcf5451SChristoph Hellwig /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 10653dcf5451SChristoph Hellwig /* 10663dcf5451SChristoph Hellwig * Performance hints. Directory preallocation should only 10673dcf5451SChristoph Hellwig * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 10683dcf5451SChristoph Hellwig */ 10693dcf5451SChristoph Hellwig __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 10703dcf5451SChristoph Hellwig __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 10713dcf5451SChristoph Hellwig __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 10723dcf5451SChristoph Hellwig /* 10733dcf5451SChristoph Hellwig * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 10743dcf5451SChristoph Hellwig */ 10753dcf5451SChristoph Hellwig /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 10763dcf5451SChristoph Hellwig /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 10773dcf5451SChristoph Hellwig __le32 s_journal_dev; /* device number of journal file */ 10783dcf5451SChristoph Hellwig __le32 s_last_orphan; /* start of list of inodes to delete */ 10793dcf5451SChristoph Hellwig __le32 s_hash_seed[4]; /* HTREE hash seed */ 10803dcf5451SChristoph Hellwig __u8 s_def_hash_version; /* Default hash version to use */ 108189eeddf0STheodore Ts'o __u8 s_jnl_backup_type; 10823dcf5451SChristoph Hellwig __le16 s_desc_size; /* size of group descriptor */ 10833dcf5451SChristoph Hellwig /*100*/ __le32 s_default_mount_opts; 10843dcf5451SChristoph Hellwig __le32 s_first_meta_bg; /* First metablock block group */ 10853dcf5451SChristoph Hellwig __le32 s_mkfs_time; /* When the filesystem was created */ 10863dcf5451SChristoph Hellwig __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 10873dcf5451SChristoph Hellwig /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 10883dcf5451SChristoph Hellwig /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 10893dcf5451SChristoph Hellwig __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 10903dcf5451SChristoph Hellwig __le32 s_free_blocks_count_hi; /* Free blocks count */ 10913dcf5451SChristoph Hellwig __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 10923dcf5451SChristoph Hellwig __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 10933dcf5451SChristoph Hellwig __le32 s_flags; /* Miscellaneous flags */ 10943dcf5451SChristoph Hellwig __le16 s_raid_stride; /* RAID stride */ 1095c5e06d10SJohann Lombardi __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 10963dcf5451SChristoph Hellwig __le64 s_mmp_block; /* Block for multi-mount protection */ 10973dcf5451SChristoph Hellwig __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1098772cb7c8SJose R. Santos __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1099e6153918SDarrick J. Wong __u8 s_checksum_type; /* metadata checksum algorithm used */ 1100772cb7c8SJose R. Santos __le16 s_reserved_pad; 1101afc32f7eSTheodore Ts'o __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 11024a9cdec7STheodore Ts'o __le32 s_snapshot_inum; /* Inode number of active snapshot */ 11034a9cdec7STheodore Ts'o __le32 s_snapshot_id; /* sequential ID of active snapshot */ 11044a9cdec7STheodore Ts'o __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 11054a9cdec7STheodore Ts'o snapshot's future use */ 11064a9cdec7STheodore Ts'o __le32 s_snapshot_list; /* inode number of the head of the 11074a9cdec7STheodore Ts'o on-disk snapshot list */ 11081c13d5c0STheodore Ts'o #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 11091c13d5c0STheodore Ts'o __le32 s_error_count; /* number of fs errors */ 11101c13d5c0STheodore Ts'o __le32 s_first_error_time; /* first time an error happened */ 11111c13d5c0STheodore Ts'o __le32 s_first_error_ino; /* inode involved in first error */ 11121c13d5c0STheodore Ts'o __le64 s_first_error_block; /* block involved of first error */ 11131c13d5c0STheodore Ts'o __u8 s_first_error_func[32]; /* function where the error happened */ 11141c13d5c0STheodore Ts'o __le32 s_first_error_line; /* line number where error happened */ 11151c13d5c0STheodore Ts'o __le32 s_last_error_time; /* most recent time of an error */ 11161c13d5c0STheodore Ts'o __le32 s_last_error_ino; /* inode involved in last error */ 11171c13d5c0STheodore Ts'o __le32 s_last_error_line; /* line number where error happened */ 11181c13d5c0STheodore Ts'o __le64 s_last_error_block; /* block involved of last error */ 11191c13d5c0STheodore Ts'o __u8 s_last_error_func[32]; /* function where the error happened */ 11208b67f04aSTheodore Ts'o #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 11218b67f04aSTheodore Ts'o __u8 s_mount_opts[64]; 1122281b5995STheodore Ts'o __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1123281b5995STheodore Ts'o __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1124281b5995STheodore Ts'o __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1125e6153918SDarrick J. Wong __le32 s_reserved[108]; /* Padding to the end of the block */ 1126e6153918SDarrick J. Wong __le32 s_checksum; /* crc32c(superblock) */ 11273dcf5451SChristoph Hellwig }; 11283dcf5451SChristoph Hellwig 11291c13d5c0STheodore Ts'o #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 11301c13d5c0STheodore Ts'o 11313dcf5451SChristoph Hellwig #ifdef __KERNEL__ 1132bc0b0d6dSTheodore Ts'o 1133bc0b0d6dSTheodore Ts'o /* 11344ab2f15bSTheodore Ts'o * run-time mount flags 1135bc0b0d6dSTheodore Ts'o */ 1136bc0b0d6dSTheodore Ts'o #define EXT4_MF_MNTDIR_SAMPLED 0x0001 11374ab2f15bSTheodore Ts'o #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1138bc0b0d6dSTheodore Ts'o 1139ca0faba0STheodore Ts'o /* 1140ca0faba0STheodore Ts'o * fourth extended-fs super-block data in memory 1141ca0faba0STheodore Ts'o */ 1142ca0faba0STheodore Ts'o struct ext4_sb_info { 1143ca0faba0STheodore Ts'o unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1144ca0faba0STheodore Ts'o unsigned long s_inodes_per_block;/* Number of inodes per block */ 1145ca0faba0STheodore Ts'o unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1146281b5995STheodore Ts'o unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1147ca0faba0STheodore Ts'o unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1148ca0faba0STheodore Ts'o unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1149ca0faba0STheodore Ts'o unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1150ca0faba0STheodore Ts'o unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1151ca0faba0STheodore Ts'o ext4_group_t s_groups_count; /* Number of groups in the fs */ 1152fb0a387dSEric Sandeen ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1153ca0faba0STheodore Ts'o unsigned long s_overhead_last; /* Last calculated overhead */ 1154ca0faba0STheodore Ts'o unsigned long s_blocks_last; /* Last seen block count */ 1155281b5995STheodore Ts'o unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1156281b5995STheodore Ts'o unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1157ca0faba0STheodore Ts'o loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1158ca0faba0STheodore Ts'o struct buffer_head * s_sbh; /* Buffer containing the super block */ 1159ca0faba0STheodore Ts'o struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1160ca0faba0STheodore Ts'o struct buffer_head **s_group_desc; 11617f4520ccSTheodore Ts'o unsigned int s_mount_opt; 1162a2595b8aSTheodore Ts'o unsigned int s_mount_opt2; 1163bc0b0d6dSTheodore Ts'o unsigned int s_mount_flags; 11645a916be1STheodore Ts'o unsigned int s_def_mount_opt; 1165ca0faba0STheodore Ts'o ext4_fsblk_t s_sb_block; 1166ca0faba0STheodore Ts'o uid_t s_resuid; 1167ca0faba0STheodore Ts'o gid_t s_resgid; 1168ca0faba0STheodore Ts'o unsigned short s_mount_state; 1169ca0faba0STheodore Ts'o unsigned short s_pad; 1170ca0faba0STheodore Ts'o int s_addr_per_block_bits; 1171ca0faba0STheodore Ts'o int s_desc_per_block_bits; 1172ca0faba0STheodore Ts'o int s_inode_size; 1173ca0faba0STheodore Ts'o int s_first_ino; 1174ca0faba0STheodore Ts'o unsigned int s_inode_readahead_blks; 117511013911SAndreas Dilger unsigned int s_inode_goal; 1176ca0faba0STheodore Ts'o spinlock_t s_next_gen_lock; 1177ca0faba0STheodore Ts'o u32 s_next_generation; 1178ca0faba0STheodore Ts'o u32 s_hash_seed[4]; 1179ca0faba0STheodore Ts'o int s_def_hash_version; 1180ca0faba0STheodore Ts'o int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 118157042651STheodore Ts'o struct percpu_counter s_freeclusters_counter; 1182ca0faba0STheodore Ts'o struct percpu_counter s_freeinodes_counter; 1183ca0faba0STheodore Ts'o struct percpu_counter s_dirs_counter; 118457042651STheodore Ts'o struct percpu_counter s_dirtyclusters_counter; 1185ca0faba0STheodore Ts'o struct blockgroup_lock *s_blockgroup_lock; 1186ca0faba0STheodore Ts'o struct proc_dir_entry *s_proc; 1187ca0faba0STheodore Ts'o struct kobject s_kobj; 1188ca0faba0STheodore Ts'o struct completion s_kobj_unregister; 1189ca0faba0STheodore Ts'o 1190ca0faba0STheodore Ts'o /* Journaling */ 1191ca0faba0STheodore Ts'o struct journal_s *s_journal; 1192ca0faba0STheodore Ts'o struct list_head s_orphan; 1193ca0faba0STheodore Ts'o struct mutex s_orphan_lock; 11948f82f840SYongqiang Yang unsigned long s_resize_flags; /* Flags indicating if there 11958f82f840SYongqiang Yang is a resizer */ 1196ca0faba0STheodore Ts'o unsigned long s_commit_interval; 1197ca0faba0STheodore Ts'o u32 s_max_batch_time; 1198ca0faba0STheodore Ts'o u32 s_min_batch_time; 1199ca0faba0STheodore Ts'o struct block_device *journal_bdev; 1200ca0faba0STheodore Ts'o #ifdef CONFIG_QUOTA 1201ca0faba0STheodore Ts'o char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 1202ca0faba0STheodore Ts'o int s_jquota_fmt; /* Format of quota to use */ 1203ca0faba0STheodore Ts'o #endif 1204ca0faba0STheodore Ts'o unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 12056fd058f7STheodore Ts'o struct rb_root system_blks; 1206ca0faba0STheodore Ts'o 1207ca0faba0STheodore Ts'o #ifdef EXTENTS_STATS 1208ca0faba0STheodore Ts'o /* ext4 extents stats */ 1209ca0faba0STheodore Ts'o unsigned long s_ext_min; 1210ca0faba0STheodore Ts'o unsigned long s_ext_max; 1211ca0faba0STheodore Ts'o unsigned long s_depth_max; 1212ca0faba0STheodore Ts'o spinlock_t s_ext_stats_lock; 1213ca0faba0STheodore Ts'o unsigned long s_ext_blocks; 1214ca0faba0STheodore Ts'o unsigned long s_ext_extents; 1215ca0faba0STheodore Ts'o #endif 1216ca0faba0STheodore Ts'o 1217ca0faba0STheodore Ts'o /* for buddy allocator */ 1218ca0faba0STheodore Ts'o struct ext4_group_info ***s_group_info; 1219ca0faba0STheodore Ts'o struct inode *s_buddy_cache; 1220ca0faba0STheodore Ts'o spinlock_t s_md_lock; 1221ca0faba0STheodore Ts'o unsigned short *s_mb_offsets; 1222ca0faba0STheodore Ts'o unsigned int *s_mb_maxs; 1223ca0faba0STheodore Ts'o 1224ca0faba0STheodore Ts'o /* tunables */ 1225ca0faba0STheodore Ts'o unsigned long s_stripe; 1226ca0faba0STheodore Ts'o unsigned int s_mb_stream_request; 1227ca0faba0STheodore Ts'o unsigned int s_mb_max_to_scan; 1228ca0faba0STheodore Ts'o unsigned int s_mb_min_to_scan; 1229ca0faba0STheodore Ts'o unsigned int s_mb_stats; 1230ca0faba0STheodore Ts'o unsigned int s_mb_order2_reqs; 1231ca0faba0STheodore Ts'o unsigned int s_mb_group_prealloc; 123255138e0bSTheodore Ts'o unsigned int s_max_writeback_mb_bump; 1233ca0faba0STheodore Ts'o /* where last allocation was done - for stream allocation */ 1234ca0faba0STheodore Ts'o unsigned long s_mb_last_group; 1235ca0faba0STheodore Ts'o unsigned long s_mb_last_start; 1236ca0faba0STheodore Ts'o 1237ca0faba0STheodore Ts'o /* stats for buddy allocator */ 1238ca0faba0STheodore Ts'o atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1239ca0faba0STheodore Ts'o atomic_t s_bal_success; /* we found long enough chunks */ 1240ca0faba0STheodore Ts'o atomic_t s_bal_allocated; /* in blocks */ 1241ca0faba0STheodore Ts'o atomic_t s_bal_ex_scanned; /* total extents scanned */ 1242ca0faba0STheodore Ts'o atomic_t s_bal_goals; /* goal hits */ 1243ca0faba0STheodore Ts'o atomic_t s_bal_breaks; /* too long searches */ 1244ca0faba0STheodore Ts'o atomic_t s_bal_2orders; /* 2^order hits */ 1245ca0faba0STheodore Ts'o spinlock_t s_bal_lock; 1246ca0faba0STheodore Ts'o unsigned long s_mb_buddies_generated; 1247ca0faba0STheodore Ts'o unsigned long long s_mb_generation_time; 1248ca0faba0STheodore Ts'o atomic_t s_mb_lost_chunks; 1249ca0faba0STheodore Ts'o atomic_t s_mb_preallocated; 1250ca0faba0STheodore Ts'o atomic_t s_mb_discarded; 125150797481STheodore Ts'o atomic_t s_lock_busy; 1252ca0faba0STheodore Ts'o 1253ca0faba0STheodore Ts'o /* locality groups */ 1254003cb608STejun Heo struct ext4_locality_group __percpu *s_locality_groups; 1255ca0faba0STheodore Ts'o 1256ca0faba0STheodore Ts'o /* for write statistics */ 1257ca0faba0STheodore Ts'o unsigned long s_sectors_written_start; 1258ca0faba0STheodore Ts'o u64 s_kbytes_written; 1259ca0faba0STheodore Ts'o 1260ca0faba0STheodore Ts'o unsigned int s_log_groups_per_flex; 1261ca0faba0STheodore Ts'o struct flex_groups *s_flex_groups; 12624c0425ffSMingming Cao 12634c0425ffSMingming Cao /* workqueue for dio unwritten */ 12644c0425ffSMingming Cao struct workqueue_struct *dio_unwritten_wq; 126566e61a9eSTheodore Ts'o 126666e61a9eSTheodore Ts'o /* timer for periodic error stats printing */ 126766e61a9eSTheodore Ts'o struct timer_list s_err_report; 1268bfff6873SLukas Czerner 1269bfff6873SLukas Czerner /* Lazy inode table initialization info */ 1270bfff6873SLukas Czerner struct ext4_li_request *s_li_request; 1271bfff6873SLukas Czerner /* Wait multiplier for lazy initialization thread */ 1272bfff6873SLukas Czerner unsigned int s_li_wait_mult; 1273c5e06d10SJohann Lombardi 1274c5e06d10SJohann Lombardi /* Kernel thread for multiple mount protection */ 1275c5e06d10SJohann Lombardi struct task_struct *s_mmp_tsk; 12763d56b8d2STao Ma 12773d56b8d2STao Ma /* record the last minlen when FITRIM is called. */ 12783d56b8d2STao Ma atomic_t s_last_trim_minblks; 1279ca0faba0STheodore Ts'o }; 1280ca0faba0STheodore Ts'o 12813dcf5451SChristoph Hellwig static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 12823dcf5451SChristoph Hellwig { 12833dcf5451SChristoph Hellwig return sb->s_fs_info; 12843dcf5451SChristoph Hellwig } 12853dcf5451SChristoph Hellwig static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 12863dcf5451SChristoph Hellwig { 12873dcf5451SChristoph Hellwig return container_of(inode, struct ext4_inode_info, vfs_inode); 12883dcf5451SChristoph Hellwig } 12893dcf5451SChristoph Hellwig 12903dcf5451SChristoph Hellwig static inline struct timespec ext4_current_time(struct inode *inode) 12913dcf5451SChristoph Hellwig { 12923dcf5451SChristoph Hellwig return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 12933dcf5451SChristoph Hellwig current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 12943dcf5451SChristoph Hellwig } 12953dcf5451SChristoph Hellwig 12963dcf5451SChristoph Hellwig static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 12973dcf5451SChristoph Hellwig { 12983dcf5451SChristoph Hellwig return ino == EXT4_ROOT_INO || 12993dcf5451SChristoph Hellwig ino == EXT4_JOURNAL_INO || 13003dcf5451SChristoph Hellwig ino == EXT4_RESIZE_INO || 13013dcf5451SChristoph Hellwig (ino >= EXT4_FIRST_INO(sb) && 13023dcf5451SChristoph Hellwig ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 13033dcf5451SChristoph Hellwig } 130419f5fb7aSTheodore Ts'o 13050edeb71dSTao Ma static inline void ext4_set_io_unwritten_flag(struct inode *inode, 13060edeb71dSTao Ma struct ext4_io_end *io_end) 13070edeb71dSTao Ma { 13080edeb71dSTao Ma if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 13090edeb71dSTao Ma io_end->flag |= EXT4_IO_END_UNWRITTEN; 13100edeb71dSTao Ma atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten); 13110edeb71dSTao Ma } 13120edeb71dSTao Ma } 13130edeb71dSTao Ma 131419f5fb7aSTheodore Ts'o /* 131519f5fb7aSTheodore Ts'o * Inode dynamic state flags 131619f5fb7aSTheodore Ts'o */ 131719f5fb7aSTheodore Ts'o enum { 131819f5fb7aSTheodore Ts'o EXT4_STATE_JDATA, /* journaled data exists */ 131919f5fb7aSTheodore Ts'o EXT4_STATE_NEW, /* inode is newly created */ 132019f5fb7aSTheodore Ts'o EXT4_STATE_XATTR, /* has in-inode xattrs */ 132119f5fb7aSTheodore Ts'o EXT4_STATE_NO_EXPAND, /* No space for expansion */ 132219f5fb7aSTheodore Ts'o EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 132319f5fb7aSTheodore Ts'o EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 132419f5fb7aSTheodore Ts'o EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 132514ece102SFrank Mayhar EXT4_STATE_NEWENTRY, /* File just added to dir */ 1326f2321097STheodore Ts'o EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */ 132719f5fb7aSTheodore Ts'o }; 132819f5fb7aSTheodore Ts'o 1329353eb83cSTheodore Ts'o #define EXT4_INODE_BIT_FNS(name, field, offset) \ 133012e9b892SDmitry Monakhov static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 133112e9b892SDmitry Monakhov { \ 1332353eb83cSTheodore Ts'o return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 133312e9b892SDmitry Monakhov } \ 133412e9b892SDmitry Monakhov static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 133512e9b892SDmitry Monakhov { \ 1336353eb83cSTheodore Ts'o set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 133712e9b892SDmitry Monakhov } \ 133812e9b892SDmitry Monakhov static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 133912e9b892SDmitry Monakhov { \ 1340353eb83cSTheodore Ts'o clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 134119f5fb7aSTheodore Ts'o } 134219f5fb7aSTheodore Ts'o 1343353eb83cSTheodore Ts'o EXT4_INODE_BIT_FNS(flag, flags, 0) 1344353eb83cSTheodore Ts'o #if (BITS_PER_LONG < 64) 1345353eb83cSTheodore Ts'o EXT4_INODE_BIT_FNS(state, state_flags, 0) 1346353eb83cSTheodore Ts'o 1347353eb83cSTheodore Ts'o static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1348353eb83cSTheodore Ts'o { 1349353eb83cSTheodore Ts'o (ei)->i_state_flags = 0; 1350353eb83cSTheodore Ts'o } 1351353eb83cSTheodore Ts'o #else 1352353eb83cSTheodore Ts'o EXT4_INODE_BIT_FNS(state, flags, 32) 1353353eb83cSTheodore Ts'o 1354353eb83cSTheodore Ts'o static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1355353eb83cSTheodore Ts'o { 1356353eb83cSTheodore Ts'o /* We depend on the fact that callers will set i_flags */ 1357353eb83cSTheodore Ts'o } 1358353eb83cSTheodore Ts'o #endif 13593dcf5451SChristoph Hellwig #else 13603dcf5451SChristoph Hellwig /* Assume that user mode programs are passing in an ext4fs superblock, not 13613dcf5451SChristoph Hellwig * a kernel struct super_block. This will allow us to call the feature-test 13623dcf5451SChristoph Hellwig * macros from user land. */ 13633dcf5451SChristoph Hellwig #define EXT4_SB(sb) (sb) 13643dcf5451SChristoph Hellwig #endif 13653dcf5451SChristoph Hellwig 13663dcf5451SChristoph Hellwig #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 13673dcf5451SChristoph Hellwig 13683dcf5451SChristoph Hellwig /* 13693dcf5451SChristoph Hellwig * Codes for operating systems 13703dcf5451SChristoph Hellwig */ 13713dcf5451SChristoph Hellwig #define EXT4_OS_LINUX 0 13723dcf5451SChristoph Hellwig #define EXT4_OS_HURD 1 13733dcf5451SChristoph Hellwig #define EXT4_OS_MASIX 2 13743dcf5451SChristoph Hellwig #define EXT4_OS_FREEBSD 3 13753dcf5451SChristoph Hellwig #define EXT4_OS_LITES 4 13763dcf5451SChristoph Hellwig 13773dcf5451SChristoph Hellwig /* 13783dcf5451SChristoph Hellwig * Revision levels 13793dcf5451SChristoph Hellwig */ 13803dcf5451SChristoph Hellwig #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 13813dcf5451SChristoph Hellwig #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 13823dcf5451SChristoph Hellwig 13833dcf5451SChristoph Hellwig #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 13843dcf5451SChristoph Hellwig #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 13853dcf5451SChristoph Hellwig 13863dcf5451SChristoph Hellwig #define EXT4_GOOD_OLD_INODE_SIZE 128 13873dcf5451SChristoph Hellwig 13883dcf5451SChristoph Hellwig /* 13893dcf5451SChristoph Hellwig * Feature set definitions 13903dcf5451SChristoph Hellwig */ 13913dcf5451SChristoph Hellwig 13923dcf5451SChristoph Hellwig #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 13933a06d778SAneesh Kumar K.V ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 13943dcf5451SChristoph Hellwig #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 13953a06d778SAneesh Kumar K.V ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 13963dcf5451SChristoph Hellwig #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 13973a06d778SAneesh Kumar K.V ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 13983dcf5451SChristoph Hellwig #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 13993dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 14003dcf5451SChristoph Hellwig #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 14013dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 14023dcf5451SChristoph Hellwig #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 14033dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 14043dcf5451SChristoph Hellwig #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 14053dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 14063dcf5451SChristoph Hellwig #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 14073dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 14083dcf5451SChristoph Hellwig #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 14093dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 14103dcf5451SChristoph Hellwig 14113dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 14123dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 14133dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 14143dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 14153dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 14163dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 14173dcf5451SChristoph Hellwig 14183dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 14193dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 14203dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 14213dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 14223dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 14233dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 14243dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1425ae812306SAditya Kali #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1426281b5995STheodore Ts'o #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1427e6153918SDarrick J. Wong /* 1428e6153918SDarrick J. Wong * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1429e6153918SDarrick J. Wong * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1430e6153918SDarrick J. Wong * all other data structures' checksums. However, the METADATA_CSUM and 1431e6153918SDarrick J. Wong * GDT_CSUM bits are mutually exclusive. 1432e6153918SDarrick J. Wong */ 14339b90e5e0STheodore Ts'o #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 14343dcf5451SChristoph Hellwig 14353dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 14363dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 14373dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 14383dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 14393dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 14403dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 14413dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 14423dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 14433dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1444f710b4b9STheodore Ts'o #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1445f710b4b9STheodore Ts'o #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1446856cbcf9STheodore Ts'o #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ 14479b90e5e0STheodore Ts'o #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1448856cbcf9STheodore Ts'o #define EXT4_FEATURE_INCOMPAT_INLINEDATA 0x8000 /* data in inode */ 14493dcf5451SChristoph Hellwig 14502035e776STheodore Ts'o #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 14512035e776STheodore Ts'o #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 14522035e776STheodore Ts'o EXT4_FEATURE_INCOMPAT_META_BG) 14532035e776STheodore Ts'o #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 14542035e776STheodore Ts'o EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 14552035e776STheodore Ts'o EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 14562035e776STheodore Ts'o 14572035e776STheodore Ts'o #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 14582035e776STheodore Ts'o #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 14592035e776STheodore Ts'o EXT4_FEATURE_INCOMPAT_RECOVER| \ 14602035e776STheodore Ts'o EXT4_FEATURE_INCOMPAT_META_BG) 14612035e776STheodore Ts'o #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 14622035e776STheodore Ts'o EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 14632035e776STheodore Ts'o EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 14642035e776STheodore Ts'o 14653dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 14663dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 14673dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_RECOVER| \ 14683dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_META_BG| \ 14693dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_EXTENTS| \ 14703dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_64BIT| \ 1471c5e06d10SJohann Lombardi EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1472c5e06d10SJohann Lombardi EXT4_FEATURE_INCOMPAT_MMP) 14733dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 14743dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 14753dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 14763dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 14773dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 14783dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 14796f16b606STheodore Ts'o EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 14806f16b606STheodore Ts'o EXT4_FEATURE_RO_COMPAT_BIGALLOC) 14813dcf5451SChristoph Hellwig 14823dcf5451SChristoph Hellwig /* 14833dcf5451SChristoph Hellwig * Default values for user and/or group using reserved blocks 14843dcf5451SChristoph Hellwig */ 14853dcf5451SChristoph Hellwig #define EXT4_DEF_RESUID 0 14863dcf5451SChristoph Hellwig #define EXT4_DEF_RESGID 0 14873dcf5451SChristoph Hellwig 1488240799cdSTheodore Ts'o #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1489240799cdSTheodore Ts'o 14903dcf5451SChristoph Hellwig /* 14913dcf5451SChristoph Hellwig * Default mount options 14923dcf5451SChristoph Hellwig */ 14933dcf5451SChristoph Hellwig #define EXT4_DEFM_DEBUG 0x0001 14943dcf5451SChristoph Hellwig #define EXT4_DEFM_BSDGROUPS 0x0002 14953dcf5451SChristoph Hellwig #define EXT4_DEFM_XATTR_USER 0x0004 14963dcf5451SChristoph Hellwig #define EXT4_DEFM_ACL 0x0008 14973dcf5451SChristoph Hellwig #define EXT4_DEFM_UID16 0x0010 14983dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE 0x0060 14993dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE_DATA 0x0020 15003dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE_ORDERED 0x0040 15013dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE_WBACK 0x0060 15028b67f04aSTheodore Ts'o #define EXT4_DEFM_NOBARRIER 0x0100 15038b67f04aSTheodore Ts'o #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 15048b67f04aSTheodore Ts'o #define EXT4_DEFM_DISCARD 0x0400 15058b67f04aSTheodore Ts'o #define EXT4_DEFM_NODELALLOC 0x0800 15063dcf5451SChristoph Hellwig 15073dcf5451SChristoph Hellwig /* 150830773840STheodore Ts'o * Default journal batch times 150930773840STheodore Ts'o */ 151030773840STheodore Ts'o #define EXT4_DEF_MIN_BATCH_TIME 0 151130773840STheodore Ts'o #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 151230773840STheodore Ts'o 151330773840STheodore Ts'o /* 1514a4912123STheodore Ts'o * Minimum number of groups in a flexgroup before we separate out 1515a4912123STheodore Ts'o * directories into the first block group of a flexgroup 1516a4912123STheodore Ts'o */ 1517a4912123STheodore Ts'o #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1518a4912123STheodore Ts'o 1519a4912123STheodore Ts'o /* 15203dcf5451SChristoph Hellwig * Structure of a directory entry 15213dcf5451SChristoph Hellwig */ 15223dcf5451SChristoph Hellwig #define EXT4_NAME_LEN 255 15233dcf5451SChristoph Hellwig 15243dcf5451SChristoph Hellwig struct ext4_dir_entry { 15253dcf5451SChristoph Hellwig __le32 inode; /* Inode number */ 15263dcf5451SChristoph Hellwig __le16 rec_len; /* Directory entry length */ 15273dcf5451SChristoph Hellwig __le16 name_len; /* Name length */ 15283dcf5451SChristoph Hellwig char name[EXT4_NAME_LEN]; /* File name */ 15293dcf5451SChristoph Hellwig }; 15303dcf5451SChristoph Hellwig 15313dcf5451SChristoph Hellwig /* 15323dcf5451SChristoph Hellwig * The new version of the directory entry. Since EXT4 structures are 15333dcf5451SChristoph Hellwig * stored in intel byte order, and the name_len field could never be 15343dcf5451SChristoph Hellwig * bigger than 255 chars, it's safe to reclaim the extra byte for the 15353dcf5451SChristoph Hellwig * file_type field. 15363dcf5451SChristoph Hellwig */ 15373dcf5451SChristoph Hellwig struct ext4_dir_entry_2 { 15383dcf5451SChristoph Hellwig __le32 inode; /* Inode number */ 15393dcf5451SChristoph Hellwig __le16 rec_len; /* Directory entry length */ 15403dcf5451SChristoph Hellwig __u8 name_len; /* Name length */ 15413dcf5451SChristoph Hellwig __u8 file_type; 15423dcf5451SChristoph Hellwig char name[EXT4_NAME_LEN]; /* File name */ 15433dcf5451SChristoph Hellwig }; 15443dcf5451SChristoph Hellwig 15453dcf5451SChristoph Hellwig /* 1546e6153918SDarrick J. Wong * This is a bogus directory entry at the end of each leaf block that 1547e6153918SDarrick J. Wong * records checksums. 1548e6153918SDarrick J. Wong */ 1549e6153918SDarrick J. Wong struct ext4_dir_entry_tail { 1550e6153918SDarrick J. Wong __le32 det_reserved_zero1; /* Pretend to be unused */ 1551e6153918SDarrick J. Wong __le16 det_rec_len; /* 12 */ 1552e6153918SDarrick J. Wong __u8 det_reserved_zero2; /* Zero name length */ 1553e6153918SDarrick J. Wong __u8 det_reserved_ft; /* 0xDE, fake file type */ 1554e6153918SDarrick J. Wong __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1555e6153918SDarrick J. Wong }; 1556e6153918SDarrick J. Wong 1557e6153918SDarrick J. Wong /* 15583dcf5451SChristoph Hellwig * Ext4 directory file types. Only the low 3 bits are used. The 15593dcf5451SChristoph Hellwig * other bits are reserved for now. 15603dcf5451SChristoph Hellwig */ 15613dcf5451SChristoph Hellwig #define EXT4_FT_UNKNOWN 0 15623dcf5451SChristoph Hellwig #define EXT4_FT_REG_FILE 1 15633dcf5451SChristoph Hellwig #define EXT4_FT_DIR 2 15643dcf5451SChristoph Hellwig #define EXT4_FT_CHRDEV 3 15653dcf5451SChristoph Hellwig #define EXT4_FT_BLKDEV 4 15663dcf5451SChristoph Hellwig #define EXT4_FT_FIFO 5 15673dcf5451SChristoph Hellwig #define EXT4_FT_SOCK 6 15683dcf5451SChristoph Hellwig #define EXT4_FT_SYMLINK 7 15693dcf5451SChristoph Hellwig 15703dcf5451SChristoph Hellwig #define EXT4_FT_MAX 8 15713dcf5451SChristoph Hellwig 1572e6153918SDarrick J. Wong #define EXT4_FT_DIR_CSUM 0xDE 1573e6153918SDarrick J. Wong 15743dcf5451SChristoph Hellwig /* 15753dcf5451SChristoph Hellwig * EXT4_DIR_PAD defines the directory entries boundaries 15763dcf5451SChristoph Hellwig * 15773dcf5451SChristoph Hellwig * NOTE: It must be a multiple of 4 15783dcf5451SChristoph Hellwig */ 15793dcf5451SChristoph Hellwig #define EXT4_DIR_PAD 4 15803dcf5451SChristoph Hellwig #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 15813dcf5451SChristoph Hellwig #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 15823dcf5451SChristoph Hellwig ~EXT4_DIR_ROUND) 15833dcf5451SChristoph Hellwig #define EXT4_MAX_REC_LEN ((1<<16)-1) 15843dcf5451SChristoph Hellwig 15853dcf5451SChristoph Hellwig /* 15860cfc9255SEric Sandeen * If we ever get support for fs block sizes > page_size, we'll need 15870cfc9255SEric Sandeen * to remove the #if statements in the next two functions... 15880cfc9255SEric Sandeen */ 15890cfc9255SEric Sandeen static inline unsigned int 15900cfc9255SEric Sandeen ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 15910cfc9255SEric Sandeen { 15920cfc9255SEric Sandeen unsigned len = le16_to_cpu(dlen); 15930cfc9255SEric Sandeen 15940cfc9255SEric Sandeen #if (PAGE_CACHE_SIZE >= 65536) 15950cfc9255SEric Sandeen if (len == EXT4_MAX_REC_LEN || len == 0) 15960cfc9255SEric Sandeen return blocksize; 15970cfc9255SEric Sandeen return (len & 65532) | ((len & 3) << 16); 15980cfc9255SEric Sandeen #else 15990cfc9255SEric Sandeen return len; 16000cfc9255SEric Sandeen #endif 16010cfc9255SEric Sandeen } 16020cfc9255SEric Sandeen 16030cfc9255SEric Sandeen static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 16040cfc9255SEric Sandeen { 16050cfc9255SEric Sandeen if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 16060cfc9255SEric Sandeen BUG(); 16070cfc9255SEric Sandeen #if (PAGE_CACHE_SIZE >= 65536) 16080cfc9255SEric Sandeen if (len < 65536) 16090cfc9255SEric Sandeen return cpu_to_le16(len); 16100cfc9255SEric Sandeen if (len == blocksize) { 16110cfc9255SEric Sandeen if (blocksize == 65536) 16120cfc9255SEric Sandeen return cpu_to_le16(EXT4_MAX_REC_LEN); 16130cfc9255SEric Sandeen else 16140cfc9255SEric Sandeen return cpu_to_le16(0); 16150cfc9255SEric Sandeen } 16160cfc9255SEric Sandeen return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 16170cfc9255SEric Sandeen #else 16180cfc9255SEric Sandeen return cpu_to_le16(len); 16190cfc9255SEric Sandeen #endif 16200cfc9255SEric Sandeen } 16210cfc9255SEric Sandeen 16220cfc9255SEric Sandeen /* 16233dcf5451SChristoph Hellwig * Hash Tree Directory indexing 16243dcf5451SChristoph Hellwig * (c) Daniel Phillips, 2001 16253dcf5451SChristoph Hellwig */ 16263dcf5451SChristoph Hellwig 16273dcf5451SChristoph Hellwig #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 16283dcf5451SChristoph Hellwig EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 162912e9b892SDmitry Monakhov ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 16303dcf5451SChristoph Hellwig #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 16313dcf5451SChristoph Hellwig #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 16323dcf5451SChristoph Hellwig 16333dcf5451SChristoph Hellwig /* Legal values for the dx_root hash_version field: */ 16343dcf5451SChristoph Hellwig 16353dcf5451SChristoph Hellwig #define DX_HASH_LEGACY 0 16363dcf5451SChristoph Hellwig #define DX_HASH_HALF_MD4 1 16373dcf5451SChristoph Hellwig #define DX_HASH_TEA 2 1638f99b2589STheodore Ts'o #define DX_HASH_LEGACY_UNSIGNED 3 1639f99b2589STheodore Ts'o #define DX_HASH_HALF_MD4_UNSIGNED 4 1640f99b2589STheodore Ts'o #define DX_HASH_TEA_UNSIGNED 5 16413dcf5451SChristoph Hellwig 16423dcf5451SChristoph Hellwig #ifdef __KERNEL__ 16433dcf5451SChristoph Hellwig 16443dcf5451SChristoph Hellwig /* hash info structure used by the directory hash */ 16453dcf5451SChristoph Hellwig struct dx_hash_info 16463dcf5451SChristoph Hellwig { 16473dcf5451SChristoph Hellwig u32 hash; 16483dcf5451SChristoph Hellwig u32 minor_hash; 16493dcf5451SChristoph Hellwig int hash_version; 16503dcf5451SChristoph Hellwig u32 *seed; 16513dcf5451SChristoph Hellwig }; 16523dcf5451SChristoph Hellwig 1653d1f5273eSFan Yong 1654d1f5273eSFan Yong /* 32 and 64 bit signed EOF for dx directories */ 1655d1f5273eSFan Yong #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1656d1f5273eSFan Yong #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1657d1f5273eSFan Yong 16583dcf5451SChristoph Hellwig 16593dcf5451SChristoph Hellwig /* 16603dcf5451SChristoph Hellwig * Control parameters used by ext4_htree_next_block 16613dcf5451SChristoph Hellwig */ 16623dcf5451SChristoph Hellwig #define HASH_NB_ALWAYS 1 16633dcf5451SChristoph Hellwig 16643dcf5451SChristoph Hellwig 16653dcf5451SChristoph Hellwig /* 16663dcf5451SChristoph Hellwig * Describe an inode's exact location on disk and in memory 16673dcf5451SChristoph Hellwig */ 16683dcf5451SChristoph Hellwig struct ext4_iloc 16693dcf5451SChristoph Hellwig { 16703dcf5451SChristoph Hellwig struct buffer_head *bh; 16713dcf5451SChristoph Hellwig unsigned long offset; 16723dcf5451SChristoph Hellwig ext4_group_t block_group; 16733dcf5451SChristoph Hellwig }; 16743dcf5451SChristoph Hellwig 16753dcf5451SChristoph Hellwig static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 16763dcf5451SChristoph Hellwig { 16773dcf5451SChristoph Hellwig return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 16783dcf5451SChristoph Hellwig } 16793dcf5451SChristoph Hellwig 16803dcf5451SChristoph Hellwig /* 16813dcf5451SChristoph Hellwig * This structure is stuffed into the struct file's private_data field 16823dcf5451SChristoph Hellwig * for directories. It is where we put information so that we can do 16833dcf5451SChristoph Hellwig * readdir operations in hash tree order. 16843dcf5451SChristoph Hellwig */ 16853dcf5451SChristoph Hellwig struct dir_private_info { 16863dcf5451SChristoph Hellwig struct rb_root root; 16873dcf5451SChristoph Hellwig struct rb_node *curr_node; 16883dcf5451SChristoph Hellwig struct fname *extra_fname; 16893dcf5451SChristoph Hellwig loff_t last_pos; 16903dcf5451SChristoph Hellwig __u32 curr_hash; 16913dcf5451SChristoph Hellwig __u32 curr_minor_hash; 16923dcf5451SChristoph Hellwig __u32 next_hash; 16933dcf5451SChristoph Hellwig }; 16943dcf5451SChristoph Hellwig 16953dcf5451SChristoph Hellwig /* calculate the first block number of the group */ 16963dcf5451SChristoph Hellwig static inline ext4_fsblk_t 16973dcf5451SChristoph Hellwig ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 16983dcf5451SChristoph Hellwig { 16993dcf5451SChristoph Hellwig return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 17003dcf5451SChristoph Hellwig le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 17013dcf5451SChristoph Hellwig } 17023dcf5451SChristoph Hellwig 17033dcf5451SChristoph Hellwig /* 17043dcf5451SChristoph Hellwig * Special error return code only used by dx_probe() and its callers. 17053dcf5451SChristoph Hellwig */ 17063dcf5451SChristoph Hellwig #define ERR_BAD_DX_DIR -75000 17073dcf5451SChristoph Hellwig 17083dcf5451SChristoph Hellwig void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1709a9df9a49STheodore Ts'o ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 17103dcf5451SChristoph Hellwig 17113dcf5451SChristoph Hellwig /* 1712bfff6873SLukas Czerner * Timeout and state flag for lazy initialization inode thread. 1713bfff6873SLukas Czerner */ 1714bfff6873SLukas Czerner #define EXT4_DEF_LI_WAIT_MULT 10 1715bfff6873SLukas Czerner #define EXT4_DEF_LI_MAX_START_DELAY 5 1716bfff6873SLukas Czerner #define EXT4_LAZYINIT_QUIT 0x0001 1717bfff6873SLukas Czerner #define EXT4_LAZYINIT_RUNNING 0x0002 1718bfff6873SLukas Czerner 1719bfff6873SLukas Czerner /* 1720bfff6873SLukas Czerner * Lazy inode table initialization info 1721bfff6873SLukas Czerner */ 1722bfff6873SLukas Czerner struct ext4_lazy_init { 1723bfff6873SLukas Czerner unsigned long li_state; 1724bfff6873SLukas Czerner struct list_head li_request_list; 1725bfff6873SLukas Czerner struct mutex li_list_mtx; 1726bfff6873SLukas Czerner }; 1727bfff6873SLukas Czerner 1728bfff6873SLukas Czerner struct ext4_li_request { 1729bfff6873SLukas Czerner struct super_block *lr_super; 1730bfff6873SLukas Czerner struct ext4_sb_info *lr_sbi; 1731bfff6873SLukas Czerner ext4_group_t lr_next_group; 1732bfff6873SLukas Czerner struct list_head lr_request; 1733bfff6873SLukas Czerner unsigned long lr_next_sched; 1734bfff6873SLukas Czerner unsigned long lr_timeout; 1735bfff6873SLukas Czerner }; 1736bfff6873SLukas Czerner 1737857ac889SLukas Czerner struct ext4_features { 1738857ac889SLukas Czerner struct kobject f_kobj; 1739857ac889SLukas Czerner struct completion f_kobj_unregister; 1740857ac889SLukas Czerner }; 1741857ac889SLukas Czerner 1742bfff6873SLukas Czerner /* 1743c5e06d10SJohann Lombardi * This structure will be used for multiple mount protection. It will be 1744c5e06d10SJohann Lombardi * written into the block number saved in the s_mmp_block field in the 1745c5e06d10SJohann Lombardi * superblock. Programs that check MMP should assume that if 1746c5e06d10SJohann Lombardi * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1747c5e06d10SJohann Lombardi * to use the filesystem, regardless of how old the timestamp is. 1748c5e06d10SJohann Lombardi */ 1749c5e06d10SJohann Lombardi #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1750c5e06d10SJohann Lombardi #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1751c5e06d10SJohann Lombardi #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1752c5e06d10SJohann Lombardi #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1753c5e06d10SJohann Lombardi 1754c5e06d10SJohann Lombardi struct mmp_struct { 1755c5e06d10SJohann Lombardi __le32 mmp_magic; /* Magic number for MMP */ 1756c5e06d10SJohann Lombardi __le32 mmp_seq; /* Sequence no. updated periodically */ 1757c5e06d10SJohann Lombardi 1758c5e06d10SJohann Lombardi /* 1759c5e06d10SJohann Lombardi * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1760c5e06d10SJohann Lombardi * purposes and do not affect the correctness of the algorithm 1761c5e06d10SJohann Lombardi */ 1762c5e06d10SJohann Lombardi __le64 mmp_time; /* Time last updated */ 1763c5e06d10SJohann Lombardi char mmp_nodename[64]; /* Node which last updated MMP block */ 1764c5e06d10SJohann Lombardi char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1765c5e06d10SJohann Lombardi 1766c5e06d10SJohann Lombardi /* 1767c5e06d10SJohann Lombardi * mmp_check_interval is used to verify if the MMP block has been 1768c5e06d10SJohann Lombardi * updated on the block device. The value is updated based on the 1769c5e06d10SJohann Lombardi * maximum time to write the MMP block during an update cycle. 1770c5e06d10SJohann Lombardi */ 1771c5e06d10SJohann Lombardi __le16 mmp_check_interval; 1772c5e06d10SJohann Lombardi 1773c5e06d10SJohann Lombardi __le16 mmp_pad1; 1774e6153918SDarrick J. Wong __le32 mmp_pad2[226]; 1775e6153918SDarrick J. Wong __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1776c5e06d10SJohann Lombardi }; 1777c5e06d10SJohann Lombardi 1778c5e06d10SJohann Lombardi /* arguments passed to the mmp thread */ 1779c5e06d10SJohann Lombardi struct mmpd_data { 1780c5e06d10SJohann Lombardi struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1781c5e06d10SJohann Lombardi struct super_block *sb; /* super block of the fs */ 1782c5e06d10SJohann Lombardi }; 1783c5e06d10SJohann Lombardi 1784c5e06d10SJohann Lombardi /* 1785c5e06d10SJohann Lombardi * Check interval multiplier 1786c5e06d10SJohann Lombardi * The MMP block is written every update interval and initially checked every 1787c5e06d10SJohann Lombardi * update interval x the multiplier (the value is then adapted based on the 1788c5e06d10SJohann Lombardi * write latency). The reason is that writes can be delayed under load and we 1789c5e06d10SJohann Lombardi * don't want readers to incorrectly assume that the filesystem is no longer 1790c5e06d10SJohann Lombardi * in use. 1791c5e06d10SJohann Lombardi */ 1792c5e06d10SJohann Lombardi #define EXT4_MMP_CHECK_MULT 2UL 1793c5e06d10SJohann Lombardi 1794c5e06d10SJohann Lombardi /* 1795c5e06d10SJohann Lombardi * Minimum interval for MMP checking in seconds. 1796c5e06d10SJohann Lombardi */ 1797c5e06d10SJohann Lombardi #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1798c5e06d10SJohann Lombardi 1799c5e06d10SJohann Lombardi /* 1800c5e06d10SJohann Lombardi * Maximum interval for MMP checking in seconds. 1801c5e06d10SJohann Lombardi */ 1802c5e06d10SJohann Lombardi #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1803c5e06d10SJohann Lombardi 1804c5e06d10SJohann Lombardi /* 18053dcf5451SChristoph Hellwig * Function prototypes 18063dcf5451SChristoph Hellwig */ 18073dcf5451SChristoph Hellwig 18083dcf5451SChristoph Hellwig /* 18093dcf5451SChristoph Hellwig * Ok, these declarations are also in <linux/kernel.h> but none of the 18103dcf5451SChristoph Hellwig * ext4 source programs needs to include it so they are duplicated here. 18113dcf5451SChristoph Hellwig */ 18123dcf5451SChristoph Hellwig # define NORET_TYPE /**/ 18133dcf5451SChristoph Hellwig # define ATTRIB_NORET __attribute__((noreturn)) 18143dcf5451SChristoph Hellwig # define NORET_AND noreturn, 18153dcf5451SChristoph Hellwig 1816498e5f24STheodore Ts'o /* bitmap.c */ 1817498e5f24STheodore Ts'o extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 1818498e5f24STheodore Ts'o 18193dcf5451SChristoph Hellwig /* balloc.c */ 18203dcf5451SChristoph Hellwig extern unsigned int ext4_block_group(struct super_block *sb, 18213dcf5451SChristoph Hellwig ext4_fsblk_t blocknr); 18223dcf5451SChristoph Hellwig extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 18233dcf5451SChristoph Hellwig ext4_fsblk_t blocknr); 18243dcf5451SChristoph Hellwig extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 18253dcf5451SChristoph Hellwig extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 18263dcf5451SChristoph Hellwig ext4_group_t group); 18277061eba7SAneesh Kumar K.V extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 182855f020dbSAllison Henderson ext4_fsblk_t goal, 182955f020dbSAllison Henderson unsigned int flags, 183055f020dbSAllison Henderson unsigned long *count, 183155f020dbSAllison Henderson int *errp); 1832e7d5f315STheodore Ts'o extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 1833e7d5f315STheodore Ts'o s64 nclusters, unsigned int flags); 18345dee5437STheodore Ts'o extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 18353dcf5451SChristoph Hellwig extern void ext4_check_blocks_bitmap(struct super_block *); 18363dcf5451SChristoph Hellwig extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 18373dcf5451SChristoph Hellwig ext4_group_t block_group, 18383dcf5451SChristoph Hellwig struct buffer_head ** bh); 18393dcf5451SChristoph Hellwig extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1840813e5727STheodore Ts'o 1841813e5727STheodore Ts'o extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 1842813e5727STheodore Ts'o ext4_group_t block_group); 1843813e5727STheodore Ts'o extern int ext4_wait_block_bitmap(struct super_block *sb, 1844813e5727STheodore Ts'o ext4_group_t block_group, 1845813e5727STheodore Ts'o struct buffer_head *bh); 1846813e5727STheodore Ts'o extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1847bb23c20aSTheodore Ts'o ext4_group_t block_group); 1848fd034a84STheodore Ts'o extern void ext4_init_block_bitmap(struct super_block *sb, 1849bb23c20aSTheodore Ts'o struct buffer_head *bh, 1850bb23c20aSTheodore Ts'o ext4_group_t group, 1851bb23c20aSTheodore Ts'o struct ext4_group_desc *desc); 1852cff1dfd7STheodore Ts'o extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 1853fd034a84STheodore Ts'o ext4_group_t block_group, 1854fd034a84STheodore Ts'o struct ext4_group_desc *gdp); 1855d5b8f310STheodore Ts'o extern unsigned ext4_num_overhead_clusters(struct super_block *sb, 1856d5b8f310STheodore Ts'o ext4_group_t block_group, 1857d5b8f310STheodore Ts'o struct ext4_group_desc *gdp); 1858f86186b4SEric Sandeen ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 18593dcf5451SChristoph Hellwig 18603dcf5451SChristoph Hellwig /* dir.c */ 186160fd4da3STheodore Ts'o extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 1862f7c21177STheodore Ts'o struct file *, 18633dcf5451SChristoph Hellwig struct ext4_dir_entry_2 *, 1864498e5f24STheodore Ts'o struct buffer_head *, unsigned int); 1865f7c21177STheodore Ts'o #define ext4_check_dir_entry(dir, filp, de, bh, offset) \ 1866f7c21177STheodore Ts'o unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 1867f7c21177STheodore Ts'o (de), (bh), (offset))) 18683dcf5451SChristoph Hellwig extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 18693dcf5451SChristoph Hellwig __u32 minor_hash, 18703dcf5451SChristoph Hellwig struct ext4_dir_entry_2 *dirent); 18713dcf5451SChristoph Hellwig extern void ext4_htree_free_dir_info(struct dir_private_info *p); 18723dcf5451SChristoph Hellwig 18733dcf5451SChristoph Hellwig /* fsync.c */ 187402c24a82SJosef Bacik extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 18753889fd57SJiaying Zhang extern int ext4_flush_completed_IO(struct inode *); 18763dcf5451SChristoph Hellwig 18773dcf5451SChristoph Hellwig /* hash.c */ 18783dcf5451SChristoph Hellwig extern int ext4fs_dirhash(const char *name, int len, struct 18793dcf5451SChristoph Hellwig dx_hash_info *hinfo); 18803dcf5451SChristoph Hellwig 18813dcf5451SChristoph Hellwig /* ialloc.c */ 1882dcca3fecSAl Viro extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t, 18835cb81dabSDmitry Monakhov const struct qstr *qstr, __u32 goal, 18845cb81dabSDmitry Monakhov uid_t *owner); 18853dcf5451SChristoph Hellwig extern void ext4_free_inode(handle_t *, struct inode *); 18863dcf5451SChristoph Hellwig extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 18873dcf5451SChristoph Hellwig extern unsigned long ext4_count_free_inodes(struct super_block *); 18883dcf5451SChristoph Hellwig extern unsigned long ext4_count_dirs(struct super_block *); 18893dcf5451SChristoph Hellwig extern void ext4_check_inodes_bitmap(struct super_block *); 189061d08673STheodore Ts'o extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 1891bfff6873SLukas Czerner extern int ext4_init_inode_table(struct super_block *sb, 1892bfff6873SLukas Czerner ext4_group_t group, int barrier); 1893813e5727STheodore Ts'o extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 18943dcf5451SChristoph Hellwig 18953dcf5451SChristoph Hellwig /* mballoc.c */ 18963dcf5451SChristoph Hellwig extern long ext4_mb_stats; 18973dcf5451SChristoph Hellwig extern long ext4_mb_max_to_scan; 18983dcf5451SChristoph Hellwig extern int ext4_mb_init(struct super_block *, int); 18993dcf5451SChristoph Hellwig extern int ext4_mb_release(struct super_block *); 19003dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 19013dcf5451SChristoph Hellwig struct ext4_allocation_request *, int *); 19023dcf5451SChristoph Hellwig extern int ext4_mb_reserve_blocks(struct super_block *, int); 1903c2ea3fdeSTheodore Ts'o extern void ext4_discard_preallocations(struct inode *); 19045dabfc78STheodore Ts'o extern int __init ext4_init_mballoc(void); 19055dabfc78STheodore Ts'o extern void ext4_exit_mballoc(void); 190644338711STheodore Ts'o extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1907e6362609STheodore Ts'o struct buffer_head *bh, ext4_fsblk_t block, 1908e6362609STheodore Ts'o unsigned long count, int flags); 1909920313a7SAneesh Kumar K.V extern int ext4_mb_add_groupinfo(struct super_block *sb, 19105f21b0e6SFrederic Bohe ext4_group_t i, struct ext4_group_desc *desc); 1911cc7365dfSYongqiang Yang extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 19122846e820SAmir Goldstein ext4_fsblk_t block, unsigned long count); 19137360d173SLukas Czerner extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 19147360d173SLukas Czerner 19153dcf5451SChristoph Hellwig /* inode.c */ 19163dcf5451SChristoph Hellwig struct buffer_head *ext4_getblk(handle_t *, struct inode *, 19173dcf5451SChristoph Hellwig ext4_lblk_t, int, int *); 19183dcf5451SChristoph Hellwig struct buffer_head *ext4_bread(handle_t *, struct inode *, 19193dcf5451SChristoph Hellwig ext4_lblk_t, int, int *); 19206873fa0dSEric Sandeen int ext4_get_block(struct inode *inode, sector_t iblock, 19216873fa0dSEric Sandeen struct buffer_head *bh_result, int create); 19223dcf5451SChristoph Hellwig 19233dcf5451SChristoph Hellwig extern struct inode *ext4_iget(struct super_block *, unsigned long); 1924a9185b41SChristoph Hellwig extern int ext4_write_inode(struct inode *, struct writeback_control *); 19253dcf5451SChristoph Hellwig extern int ext4_setattr(struct dentry *, struct iattr *); 19263e3398a0SMingming Cao extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 19273e3398a0SMingming Cao struct kstat *stat); 19280930fcc1SAl Viro extern void ext4_evict_inode(struct inode *); 19290930fcc1SAl Viro extern void ext4_clear_inode(struct inode *); 19303dcf5451SChristoph Hellwig extern int ext4_sync_inode(handle_t *, struct inode *); 1931aa385729SChristoph Hellwig extern void ext4_dirty_inode(struct inode *, int); 19323dcf5451SChristoph Hellwig extern int ext4_change_inode_journal_flag(struct inode *, int); 19333dcf5451SChristoph Hellwig extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 193491ef4cafSDuane Griffin extern int ext4_can_truncate(struct inode *inode); 19353dcf5451SChristoph Hellwig extern void ext4_truncate(struct inode *); 1936a4bb6b64SAllison Henderson extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); 1937487caeefSJan Kara extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 19383dcf5451SChristoph Hellwig extern void ext4_set_inode_flags(struct inode *); 19393dcf5451SChristoph Hellwig extern void ext4_get_inode_flags(struct ext4_inode_info *); 1940ccd2506bSTheodore Ts'o extern int ext4_alloc_da_blocks(struct inode *inode); 19413dcf5451SChristoph Hellwig extern void ext4_set_aops(struct inode *inode); 19423dcf5451SChristoph Hellwig extern int ext4_writepage_trans_blocks(struct inode *); 1943f3bd1f3fSMingming Cao extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 19444e96b2dbSAllison Henderson extern int ext4_discard_partial_page_buffers(handle_t *handle, 19454e96b2dbSAllison Henderson struct address_space *mapping, loff_t from, 19464e96b2dbSAllison Henderson loff_t length, int flags); 1947c2ec175cSNick Piggin extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 1948a9e7f447SDmitry Monakhov extern qsize_t *ext4_get_reserved_space(struct inode *inode); 19495f634d06SAneesh Kumar K.V extern void ext4_da_update_reserve_space(struct inode *inode, 19505f634d06SAneesh Kumar K.V int used, int quota_claim); 1951dae1e52cSAmir Goldstein 1952dae1e52cSAmir Goldstein /* indirect.c */ 1953dae1e52cSAmir Goldstein extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 1954dae1e52cSAmir Goldstein struct ext4_map_blocks *map, int flags); 1955dae1e52cSAmir Goldstein extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, 1956dae1e52cSAmir Goldstein const struct iovec *iov, loff_t offset, 1957dae1e52cSAmir Goldstein unsigned long nr_segs); 1958dae1e52cSAmir Goldstein extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 1959dae1e52cSAmir Goldstein extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk); 1960ff9893dcSAmir Goldstein extern void ext4_ind_truncate(struct inode *inode); 1961ff9893dcSAmir Goldstein 19623dcf5451SChristoph Hellwig /* ioctl.c */ 19633dcf5451SChristoph Hellwig extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 19643dcf5451SChristoph Hellwig extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 19653dcf5451SChristoph Hellwig 19663dcf5451SChristoph Hellwig /* migrate.c */ 19672a43a878SAneesh Kumar K.V extern int ext4_ext_migrate(struct inode *); 19683d0518f4SWei Yongjun 19693dcf5451SChristoph Hellwig /* namei.c */ 19703dcf5451SChristoph Hellwig extern int ext4_orphan_add(handle_t *, struct inode *); 19713dcf5451SChristoph Hellwig extern int ext4_orphan_del(handle_t *, struct inode *); 19723dcf5451SChristoph Hellwig extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 19733dcf5451SChristoph Hellwig __u32 start_minor_hash, __u32 *next_hash); 19743dcf5451SChristoph Hellwig 19753dcf5451SChristoph Hellwig /* resize.c */ 19763dcf5451SChristoph Hellwig extern int ext4_group_add(struct super_block *sb, 19773dcf5451SChristoph Hellwig struct ext4_new_group_data *input); 19783dcf5451SChristoph Hellwig extern int ext4_group_extend(struct super_block *sb, 19793dcf5451SChristoph Hellwig struct ext4_super_block *es, 19803dcf5451SChristoph Hellwig ext4_fsblk_t n_blocks_count); 198119c5246dSYongqiang Yang extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 19823dcf5451SChristoph Hellwig 19833dcf5451SChristoph Hellwig /* super.c */ 19849933fc0aSTheodore Ts'o extern void *ext4_kvmalloc(size_t size, gfp_t flags); 19859933fc0aSTheodore Ts'o extern void *ext4_kvzalloc(size_t size, gfp_t flags); 19869933fc0aSTheodore Ts'o extern void ext4_kvfree(void *ptr); 1987b9075fa9SJoe Perches extern __printf(4, 5) 1988b9075fa9SJoe Perches void __ext4_error(struct super_block *, const char *, unsigned int, 1989b9075fa9SJoe Perches const char *, ...); 1990c398eda0STheodore Ts'o #define ext4_error(sb, message...) __ext4_error(sb, __func__, \ 1991c398eda0STheodore Ts'o __LINE__, ## message) 1992b9075fa9SJoe Perches extern __printf(5, 6) 1993b9075fa9SJoe Perches void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 1994b9075fa9SJoe Perches const char *, ...); 1995b9075fa9SJoe Perches extern __printf(5, 6) 1996b9075fa9SJoe Perches void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 1997b9075fa9SJoe Perches const char *, ...); 1998c398eda0STheodore Ts'o extern void __ext4_std_error(struct super_block *, const char *, 1999c398eda0STheodore Ts'o unsigned int, int); 2000b9075fa9SJoe Perches extern __printf(4, 5) 2001b9075fa9SJoe Perches void __ext4_abort(struct super_block *, const char *, unsigned int, 2002b9075fa9SJoe Perches const char *, ...); 2003c398eda0STheodore Ts'o #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \ 2004c398eda0STheodore Ts'o __LINE__, ## message) 2005b9075fa9SJoe Perches extern __printf(4, 5) 2006b9075fa9SJoe Perches void __ext4_warning(struct super_block *, const char *, unsigned int, 2007b9075fa9SJoe Perches const char *, ...); 2008c398eda0STheodore Ts'o #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \ 2009c398eda0STheodore Ts'o __LINE__, ## message) 2010b9075fa9SJoe Perches extern __printf(3, 4) 2011b9075fa9SJoe Perches void ext4_msg(struct super_block *, const char *, const char *, ...); 2012c5e06d10SJohann Lombardi extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2013c5e06d10SJohann Lombardi const char *, unsigned int, const char *); 2014c5e06d10SJohann Lombardi #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \ 2015c5e06d10SJohann Lombardi __LINE__, msg) 2016b9075fa9SJoe Perches extern __printf(7, 8) 2017b9075fa9SJoe Perches void __ext4_grp_locked_error(const char *, unsigned int, 2018b9075fa9SJoe Perches struct super_block *, ext4_group_t, 2019b9075fa9SJoe Perches unsigned long, ext4_fsblk_t, 2020b9075fa9SJoe Perches const char *, ...); 2021e29136f8STheodore Ts'o #define ext4_grp_locked_error(sb, grp, message...) \ 2022e29136f8STheodore Ts'o __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message) 20233dcf5451SChristoph Hellwig extern void ext4_update_dynamic_rev(struct super_block *sb); 20243dcf5451SChristoph Hellwig extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 20253dcf5451SChristoph Hellwig __u32 compat); 20263dcf5451SChristoph Hellwig extern int ext4_update_rocompat_feature(handle_t *handle, 20273dcf5451SChristoph Hellwig struct super_block *sb, __u32 rocompat); 20283dcf5451SChristoph Hellwig extern int ext4_update_incompat_feature(handle_t *handle, 20293dcf5451SChristoph Hellwig struct super_block *sb, __u32 incompat); 20303dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 20313dcf5451SChristoph Hellwig struct ext4_group_desc *bg); 20323dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 20333dcf5451SChristoph Hellwig struct ext4_group_desc *bg); 20343dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 20353dcf5451SChristoph Hellwig struct ext4_group_desc *bg); 2036021b65bbSTheodore Ts'o extern __u32 ext4_free_group_clusters(struct super_block *sb, 2037560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 2038560671a0SAneesh Kumar K.V extern __u32 ext4_free_inodes_count(struct super_block *sb, 2039560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 2040560671a0SAneesh Kumar K.V extern __u32 ext4_used_dirs_count(struct super_block *sb, 2041560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 2042560671a0SAneesh Kumar K.V extern __u32 ext4_itable_unused_count(struct super_block *sb, 2043560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 20443dcf5451SChristoph Hellwig extern void ext4_block_bitmap_set(struct super_block *sb, 20453dcf5451SChristoph Hellwig struct ext4_group_desc *bg, ext4_fsblk_t blk); 20463dcf5451SChristoph Hellwig extern void ext4_inode_bitmap_set(struct super_block *sb, 20473dcf5451SChristoph Hellwig struct ext4_group_desc *bg, ext4_fsblk_t blk); 20483dcf5451SChristoph Hellwig extern void ext4_inode_table_set(struct super_block *sb, 20493dcf5451SChristoph Hellwig struct ext4_group_desc *bg, ext4_fsblk_t blk); 2050021b65bbSTheodore Ts'o extern void ext4_free_group_clusters_set(struct super_block *sb, 2051021b65bbSTheodore Ts'o struct ext4_group_desc *bg, 2052021b65bbSTheodore Ts'o __u32 count); 2053560671a0SAneesh Kumar K.V extern void ext4_free_inodes_set(struct super_block *sb, 2054560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count); 2055560671a0SAneesh Kumar K.V extern void ext4_used_dirs_set(struct super_block *sb, 2056560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count); 2057560671a0SAneesh Kumar K.V extern void ext4_itable_unused_set(struct super_block *sb, 2058560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count); 2059bb23c20aSTheodore Ts'o extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, 2060bb23c20aSTheodore Ts'o struct ext4_group_desc *gdp); 2061bb23c20aSTheodore Ts'o extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, 2062bb23c20aSTheodore Ts'o struct ext4_group_desc *gdp); 20633dcf5451SChristoph Hellwig 20643dcf5451SChristoph Hellwig static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 20653dcf5451SChristoph Hellwig { 20663dcf5451SChristoph Hellwig return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 20673dcf5451SChristoph Hellwig le32_to_cpu(es->s_blocks_count_lo); 20683dcf5451SChristoph Hellwig } 20693dcf5451SChristoph Hellwig 20703dcf5451SChristoph Hellwig static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 20713dcf5451SChristoph Hellwig { 20723dcf5451SChristoph Hellwig return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 20733dcf5451SChristoph Hellwig le32_to_cpu(es->s_r_blocks_count_lo); 20743dcf5451SChristoph Hellwig } 20753dcf5451SChristoph Hellwig 20763dcf5451SChristoph Hellwig static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 20773dcf5451SChristoph Hellwig { 20783dcf5451SChristoph Hellwig return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 20793dcf5451SChristoph Hellwig le32_to_cpu(es->s_free_blocks_count_lo); 20803dcf5451SChristoph Hellwig } 20813dcf5451SChristoph Hellwig 20823dcf5451SChristoph Hellwig static inline void ext4_blocks_count_set(struct ext4_super_block *es, 20833dcf5451SChristoph Hellwig ext4_fsblk_t blk) 20843dcf5451SChristoph Hellwig { 20853dcf5451SChristoph Hellwig es->s_blocks_count_lo = cpu_to_le32((u32)blk); 20863dcf5451SChristoph Hellwig es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 20873dcf5451SChristoph Hellwig } 20883dcf5451SChristoph Hellwig 20893dcf5451SChristoph Hellwig static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 20903dcf5451SChristoph Hellwig ext4_fsblk_t blk) 20913dcf5451SChristoph Hellwig { 20923dcf5451SChristoph Hellwig es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 20933dcf5451SChristoph Hellwig es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 20943dcf5451SChristoph Hellwig } 20953dcf5451SChristoph Hellwig 20963dcf5451SChristoph Hellwig static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 20973dcf5451SChristoph Hellwig ext4_fsblk_t blk) 20983dcf5451SChristoph Hellwig { 20993dcf5451SChristoph Hellwig es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 21003dcf5451SChristoph Hellwig es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 21013dcf5451SChristoph Hellwig } 21023dcf5451SChristoph Hellwig 21033dcf5451SChristoph Hellwig static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 21043dcf5451SChristoph Hellwig { 210506a279d6STheodore Ts'o if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 21063dcf5451SChristoph Hellwig return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 21073dcf5451SChristoph Hellwig le32_to_cpu(raw_inode->i_size_lo); 210806a279d6STheodore Ts'o else 210906a279d6STheodore Ts'o return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 21103dcf5451SChristoph Hellwig } 21113dcf5451SChristoph Hellwig 21123dcf5451SChristoph Hellwig static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 21133dcf5451SChristoph Hellwig { 21143dcf5451SChristoph Hellwig raw_inode->i_size_lo = cpu_to_le32(i_size); 21153dcf5451SChristoph Hellwig raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 21163dcf5451SChristoph Hellwig } 21173dcf5451SChristoph Hellwig 21183dcf5451SChristoph Hellwig static inline 21193dcf5451SChristoph Hellwig struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 21203dcf5451SChristoph Hellwig ext4_group_t group) 21213dcf5451SChristoph Hellwig { 21223dcf5451SChristoph Hellwig struct ext4_group_info ***grp_info; 21233dcf5451SChristoph Hellwig long indexv, indexh; 21243dcf5451SChristoph Hellwig grp_info = EXT4_SB(sb)->s_group_info; 21253dcf5451SChristoph Hellwig indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 21263dcf5451SChristoph Hellwig indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 21273dcf5451SChristoph Hellwig return grp_info[indexv][indexh]; 21283dcf5451SChristoph Hellwig } 21293dcf5451SChristoph Hellwig 21308df9675fSTheodore Ts'o /* 21318df9675fSTheodore Ts'o * Reading s_groups_count requires using smp_rmb() afterwards. See 21328df9675fSTheodore Ts'o * the locking protocol documented in the comments of ext4_group_add() 21338df9675fSTheodore Ts'o * in resize.c 21348df9675fSTheodore Ts'o */ 21358df9675fSTheodore Ts'o static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 21368df9675fSTheodore Ts'o { 21378df9675fSTheodore Ts'o ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 21388df9675fSTheodore Ts'o 21398df9675fSTheodore Ts'o smp_rmb(); 21408df9675fSTheodore Ts'o return ngroups; 21418df9675fSTheodore Ts'o } 21423dcf5451SChristoph Hellwig 2143772cb7c8SJose R. Santos static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2144772cb7c8SJose R. Santos ext4_group_t block_group) 2145772cb7c8SJose R. Santos { 2146772cb7c8SJose R. Santos return block_group >> sbi->s_log_groups_per_flex; 2147772cb7c8SJose R. Santos } 2148772cb7c8SJose R. Santos 2149772cb7c8SJose R. Santos static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2150772cb7c8SJose R. Santos { 2151772cb7c8SJose R. Santos return 1 << sbi->s_log_groups_per_flex; 2152772cb7c8SJose R. Santos } 2153772cb7c8SJose R. Santos 21543dcf5451SChristoph Hellwig #define ext4_std_error(sb, errno) \ 21553dcf5451SChristoph Hellwig do { \ 21563dcf5451SChristoph Hellwig if ((errno)) \ 2157c398eda0STheodore Ts'o __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 21583dcf5451SChristoph Hellwig } while (0) 21593dcf5451SChristoph Hellwig 2160a30d542aSAneesh Kumar K.V #ifdef CONFIG_SMP 2161df55c99dSTheodore Ts'o /* Each CPU can accumulate percpu_counter_batch clusters in their local 2162df55c99dSTheodore Ts'o * counters. So we need to make sure we have free clusters more 2163179f7ebfSEric Dumazet * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2164a30d542aSAneesh Kumar K.V */ 2165df55c99dSTheodore Ts'o #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2166a30d542aSAneesh Kumar K.V #else 2167df55c99dSTheodore Ts'o #define EXT4_FREECLUSTERS_WATERMARK 0 2168a30d542aSAneesh Kumar K.V #endif 2169a30d542aSAneesh Kumar K.V 2170cf17fea6SAneesh Kumar K.V static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2171cf17fea6SAneesh Kumar K.V { 2172cf17fea6SAneesh Kumar K.V /* 2173cf17fea6SAneesh Kumar K.V * XXX: replace with spinlock if seen contended -bzzz 2174cf17fea6SAneesh Kumar K.V */ 2175cf17fea6SAneesh Kumar K.V down_write(&EXT4_I(inode)->i_data_sem); 2176cf17fea6SAneesh Kumar K.V if (newsize > EXT4_I(inode)->i_disksize) 2177cf17fea6SAneesh Kumar K.V EXT4_I(inode)->i_disksize = newsize; 2178cf17fea6SAneesh Kumar K.V up_write(&EXT4_I(inode)->i_data_sem); 2179cf17fea6SAneesh Kumar K.V return ; 2180cf17fea6SAneesh Kumar K.V } 2181a30d542aSAneesh Kumar K.V 21825d1b1b3fSAneesh Kumar K.V struct ext4_group_info { 21835d1b1b3fSAneesh Kumar K.V unsigned long bb_state; 21845d1b1b3fSAneesh Kumar K.V struct rb_root bb_free_root; 2185a36b4498SEric Sandeen ext4_grpblk_t bb_first_free; /* first free block */ 2186a36b4498SEric Sandeen ext4_grpblk_t bb_free; /* total free blocks */ 2187a36b4498SEric Sandeen ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 21888a57d9d6SCurt Wohlgemuth ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 21895d1b1b3fSAneesh Kumar K.V struct list_head bb_prealloc_list; 21905d1b1b3fSAneesh Kumar K.V #ifdef DOUBLE_CHECK 21915d1b1b3fSAneesh Kumar K.V void *bb_bitmap; 21925d1b1b3fSAneesh Kumar K.V #endif 21935d1b1b3fSAneesh Kumar K.V struct rw_semaphore alloc_sem; 2194a36b4498SEric Sandeen ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2195a36b4498SEric Sandeen * regions, index is order. 2196a36b4498SEric Sandeen * bb_counters[3] = 5 means 2197a36b4498SEric Sandeen * 5 free 8-block regions. */ 21985d1b1b3fSAneesh Kumar K.V }; 21995d1b1b3fSAneesh Kumar K.V 22005d1b1b3fSAneesh Kumar K.V #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 22013d56b8d2STao Ma #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 22025d1b1b3fSAneesh Kumar K.V 22035d1b1b3fSAneesh Kumar K.V #define EXT4_MB_GRP_NEED_INIT(grp) \ 22045d1b1b3fSAneesh Kumar K.V (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 22055d1b1b3fSAneesh Kumar K.V 22063d56b8d2STao Ma #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 22073d56b8d2STao Ma (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 22083d56b8d2STao Ma #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 22093d56b8d2STao Ma (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 22103d56b8d2STao Ma #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 22113d56b8d2STao Ma (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 22123d56b8d2STao Ma 221350797481STheodore Ts'o #define EXT4_MAX_CONTENTION 8 221450797481STheodore Ts'o #define EXT4_CONTENTION_THRESHOLD 2 221550797481STheodore Ts'o 2216955ce5f5SAneesh Kumar K.V static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2217955ce5f5SAneesh Kumar K.V ext4_group_t group) 2218955ce5f5SAneesh Kumar K.V { 2219955ce5f5SAneesh Kumar K.V return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2220955ce5f5SAneesh Kumar K.V } 2221955ce5f5SAneesh Kumar K.V 222250797481STheodore Ts'o /* 222350797481STheodore Ts'o * Returns true if the filesystem is busy enough that attempts to 222450797481STheodore Ts'o * access the block group locks has run into contention. 222550797481STheodore Ts'o */ 222650797481STheodore Ts'o static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 222750797481STheodore Ts'o { 222850797481STheodore Ts'o return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 222950797481STheodore Ts'o } 223050797481STheodore Ts'o 22315d1b1b3fSAneesh Kumar K.V static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 22325d1b1b3fSAneesh Kumar K.V { 223350797481STheodore Ts'o spinlock_t *lock = ext4_group_lock_ptr(sb, group); 223450797481STheodore Ts'o if (spin_trylock(lock)) 223550797481STheodore Ts'o /* 223650797481STheodore Ts'o * We're able to grab the lock right away, so drop the 223750797481STheodore Ts'o * lock contention counter. 223850797481STheodore Ts'o */ 223950797481STheodore Ts'o atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 224050797481STheodore Ts'o else { 224150797481STheodore Ts'o /* 224250797481STheodore Ts'o * The lock is busy, so bump the contention counter, 224350797481STheodore Ts'o * and then wait on the spin lock. 224450797481STheodore Ts'o */ 224550797481STheodore Ts'o atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 224650797481STheodore Ts'o EXT4_MAX_CONTENTION); 224750797481STheodore Ts'o spin_lock(lock); 224850797481STheodore Ts'o } 22495d1b1b3fSAneesh Kumar K.V } 22505d1b1b3fSAneesh Kumar K.V 22515d1b1b3fSAneesh Kumar K.V static inline void ext4_unlock_group(struct super_block *sb, 22525d1b1b3fSAneesh Kumar K.V ext4_group_t group) 22535d1b1b3fSAneesh Kumar K.V { 2254955ce5f5SAneesh Kumar K.V spin_unlock(ext4_group_lock_ptr(sb, group)); 22555d1b1b3fSAneesh Kumar K.V } 22565d1b1b3fSAneesh Kumar K.V 2257a0375156STheodore Ts'o static inline void ext4_mark_super_dirty(struct super_block *sb) 2258a0375156STheodore Ts'o { 2259a0375156STheodore Ts'o if (EXT4_SB(sb)->s_journal == NULL) 2260a0375156STheodore Ts'o sb->s_dirt =1; 2261a0375156STheodore Ts'o } 2262a0375156STheodore Ts'o 22633dcf5451SChristoph Hellwig /* 22641f7d1e77STheodore Ts'o * Block validity checking 22651f7d1e77STheodore Ts'o */ 22661f7d1e77STheodore Ts'o #define ext4_check_indirect_blockref(inode, bh) \ 22671f7d1e77STheodore Ts'o ext4_check_blockref(__func__, __LINE__, inode, \ 22681f7d1e77STheodore Ts'o (__le32 *)(bh)->b_data, \ 22691f7d1e77STheodore Ts'o EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 22701f7d1e77STheodore Ts'o 22711f7d1e77STheodore Ts'o #define ext4_ind_check_inode(inode) \ 22721f7d1e77STheodore Ts'o ext4_check_blockref(__func__, __LINE__, inode, \ 22731f7d1e77STheodore Ts'o EXT4_I(inode)->i_data, \ 22741f7d1e77STheodore Ts'o EXT4_NDIR_BLOCKS) 22751f7d1e77STheodore Ts'o 22761f7d1e77STheodore Ts'o /* 22773dcf5451SChristoph Hellwig * Inodes and files operations 22783dcf5451SChristoph Hellwig */ 22793dcf5451SChristoph Hellwig 22803dcf5451SChristoph Hellwig /* dir.c */ 22813dcf5451SChristoph Hellwig extern const struct file_operations ext4_dir_operations; 22823dcf5451SChristoph Hellwig 22833dcf5451SChristoph Hellwig /* file.c */ 22843dcf5451SChristoph Hellwig extern const struct inode_operations ext4_file_inode_operations; 22853dcf5451SChristoph Hellwig extern const struct file_operations ext4_file_operations; 2286e0d10bfaSToshiyuki Okajima extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 22873dcf5451SChristoph Hellwig 22883dcf5451SChristoph Hellwig /* namei.c */ 22893dcf5451SChristoph Hellwig extern const struct inode_operations ext4_dir_inode_operations; 22903dcf5451SChristoph Hellwig extern const struct inode_operations ext4_special_inode_operations; 2291596397b7STheodore Ts'o extern struct dentry *ext4_get_parent(struct dentry *child); 22923dcf5451SChristoph Hellwig 22933dcf5451SChristoph Hellwig /* symlink.c */ 22943dcf5451SChristoph Hellwig extern const struct inode_operations ext4_symlink_inode_operations; 22953dcf5451SChristoph Hellwig extern const struct inode_operations ext4_fast_symlink_inode_operations; 22963dcf5451SChristoph Hellwig 22976fd058f7STheodore Ts'o /* block_validity */ 22986fd058f7STheodore Ts'o extern void ext4_release_system_zone(struct super_block *sb); 22996fd058f7STheodore Ts'o extern int ext4_setup_system_zone(struct super_block *sb); 23005dabfc78STheodore Ts'o extern int __init ext4_init_system_zone(void); 23015dabfc78STheodore Ts'o extern void ext4_exit_system_zone(void); 23026fd058f7STheodore Ts'o extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 23036fd058f7STheodore Ts'o ext4_fsblk_t start_blk, 23046fd058f7STheodore Ts'o unsigned int count); 23051f7d1e77STheodore Ts'o extern int ext4_check_blockref(const char *, unsigned int, 23061f7d1e77STheodore Ts'o struct inode *, __le32 *, unsigned int); 23076fd058f7STheodore Ts'o 23083dcf5451SChristoph Hellwig /* extents.c */ 23093dcf5451SChristoph Hellwig extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 23103dcf5451SChristoph Hellwig extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2311a02908f1SMingming Cao extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 2312a02908f1SMingming Cao int chunk); 2313e35fd660STheodore Ts'o extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2314e35fd660STheodore Ts'o struct ext4_map_blocks *map, int flags); 2315cf108bcaSJan Kara extern void ext4_ext_truncate(struct inode *); 2316a4bb6b64SAllison Henderson extern int ext4_ext_punch_hole(struct file *file, loff_t offset, 2317a4bb6b64SAllison Henderson loff_t length); 23183dcf5451SChristoph Hellwig extern void ext4_ext_init(struct super_block *); 23193dcf5451SChristoph Hellwig extern void ext4_ext_release(struct super_block *); 23202fe17c10SChristoph Hellwig extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 23213dcf5451SChristoph Hellwig loff_t len); 23220031462bSMingming Cao extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, 2323a1de02dcSEric Sandeen ssize_t len); 2324e35fd660STheodore Ts'o extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2325e35fd660STheodore Ts'o struct ext4_map_blocks *map, int flags); 23263a06d778SAneesh Kumar K.V extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 23273a06d778SAneesh Kumar K.V __u64 start, __u64 len); 2328748de673SAkira Fujita /* move_extent.c */ 2329748de673SAkira Fujita extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2330748de673SAkira Fujita __u64 start_orig, __u64 start_donor, 2331748de673SAkira Fujita __u64 len, __u64 *moved_len); 2332748de673SAkira Fujita 2333bd2d0210STheodore Ts'o /* page-io.c */ 23345dabfc78STheodore Ts'o extern int __init ext4_init_pageio(void); 23355dabfc78STheodore Ts'o extern void ext4_exit_pageio(void); 2336f7ad6d2eSTheodore Ts'o extern void ext4_ioend_wait(struct inode *); 2337bd2d0210STheodore Ts'o extern void ext4_free_io_end(ext4_io_end_t *io); 2338bd2d0210STheodore Ts'o extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 2339bd2d0210STheodore Ts'o extern int ext4_end_io_nolock(ext4_io_end_t *io); 2340bd2d0210STheodore Ts'o extern void ext4_io_submit(struct ext4_io_submit *io); 2341bd2d0210STheodore Ts'o extern int ext4_bio_write_page(struct ext4_io_submit *io, 2342bd2d0210STheodore Ts'o struct page *page, 2343bd2d0210STheodore Ts'o int len, 2344bd2d0210STheodore Ts'o struct writeback_control *wbc); 23453a06d778SAneesh Kumar K.V 2346c5e06d10SJohann Lombardi /* mmp.c */ 2347c5e06d10SJohann Lombardi extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 2348c5e06d10SJohann Lombardi 2349744692dcSJiaying Zhang /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ 2350744692dcSJiaying Zhang enum ext4_state_bits { 2351744692dcSJiaying Zhang BH_Uninit /* blocks are allocated but uninitialized on disk */ 2352744692dcSJiaying Zhang = BH_JBDPrivateStart, 23537b415bf6SAditya Kali BH_AllocFromCluster, /* allocated blocks were part of already 23547b415bf6SAditya Kali * allocated cluster. Note that this flag will 23557b415bf6SAditya Kali * never, ever appear in a buffer_head's state 23567b415bf6SAditya Kali * flag. See EXT4_MAP_FROM_CLUSTER to see where 23577b415bf6SAditya Kali * this is used. */ 23585356f261SAditya Kali BH_Da_Mapped, /* Delayed allocated block that now has a mapping. This 23595356f261SAditya Kali * flag is set when ext4_map_blocks is called on a 23605356f261SAditya Kali * delayed allocated block to get its real mapping. */ 2361744692dcSJiaying Zhang }; 2362744692dcSJiaying Zhang 2363744692dcSJiaying Zhang BUFFER_FNS(Uninit, uninit) 2364744692dcSJiaying Zhang TAS_BUFFER_FNS(Uninit, uninit) 23655356f261SAditya Kali BUFFER_FNS(Da_Mapped, da_mapped) 2366744692dcSJiaying Zhang 23672ccb5fb9SAneesh Kumar K.V /* 23682ccb5fb9SAneesh Kumar K.V * Add new method to test wether block and inode bitmaps are properly 23692ccb5fb9SAneesh Kumar K.V * initialized. With uninit_bg reading the block from disk is not enough 23702ccb5fb9SAneesh Kumar K.V * to mark the bitmap uptodate. We need to also zero-out the bitmap 23712ccb5fb9SAneesh Kumar K.V */ 23722ccb5fb9SAneesh Kumar K.V #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 23732ccb5fb9SAneesh Kumar K.V 23742ccb5fb9SAneesh Kumar K.V static inline int bitmap_uptodate(struct buffer_head *bh) 23752ccb5fb9SAneesh Kumar K.V { 23762ccb5fb9SAneesh Kumar K.V return (buffer_uptodate(bh) && 23772ccb5fb9SAneesh Kumar K.V test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 23782ccb5fb9SAneesh Kumar K.V } 23792ccb5fb9SAneesh Kumar K.V static inline void set_bitmap_uptodate(struct buffer_head *bh) 23802ccb5fb9SAneesh Kumar K.V { 23812ccb5fb9SAneesh Kumar K.V set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 23822ccb5fb9SAneesh Kumar K.V } 23832ccb5fb9SAneesh Kumar K.V 2384731eb1a0SAkinobu Mita #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 2385731eb1a0SAkinobu Mita 2386e9e3bcecSEric Sandeen /* For ioend & aio unwritten conversion wait queues */ 2387e9e3bcecSEric Sandeen #define EXT4_WQ_HASH_SZ 37 2388e9e3bcecSEric Sandeen #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 2389e9e3bcecSEric Sandeen EXT4_WQ_HASH_SZ]) 2390e9e3bcecSEric Sandeen #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 2391e9e3bcecSEric Sandeen EXT4_WQ_HASH_SZ]) 2392e9e3bcecSEric Sandeen extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 2393e9e3bcecSEric Sandeen extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 2394e9e3bcecSEric Sandeen 23958f82f840SYongqiang Yang #define EXT4_RESIZING 0 23968f82f840SYongqiang Yang extern int ext4_resize_begin(struct super_block *sb); 23978f82f840SYongqiang Yang extern void ext4_resize_end(struct super_block *sb); 23988f82f840SYongqiang Yang 23993dcf5451SChristoph Hellwig #endif /* __KERNEL__ */ 24003dcf5451SChristoph Hellwig 2401d8990240SAditya Kali #include "ext4_extents.h" 2402d8990240SAditya Kali 24033dcf5451SChristoph Hellwig #endif /* _EXT4_H */ 2404