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> 320441984aSDarrick J. Wong #include <crypto/hash.h> 334d92dc0fSBen Hutchings #ifdef __KERNEL__ 344d92dc0fSBen Hutchings #include <linux/compat.h> 354d92dc0fSBen Hutchings #endif 363dcf5451SChristoph Hellwig 373dcf5451SChristoph Hellwig /* 388a35694eSShen Feng * The fourth extended filesystem constants/structures 393dcf5451SChristoph Hellwig */ 403dcf5451SChristoph Hellwig 413dcf5451SChristoph Hellwig /* 423dcf5451SChristoph Hellwig * Define EXT4FS_DEBUG to produce debug messages 433dcf5451SChristoph Hellwig */ 443dcf5451SChristoph Hellwig #undef EXT4FS_DEBUG 453dcf5451SChristoph Hellwig 463dcf5451SChristoph Hellwig /* 473dcf5451SChristoph Hellwig * Debug code 483dcf5451SChristoph Hellwig */ 493dcf5451SChristoph Hellwig #ifdef EXT4FS_DEBUG 503dcf5451SChristoph Hellwig #define ext4_debug(f, a...) \ 513dcf5451SChristoph Hellwig do { \ 523dcf5451SChristoph Hellwig printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 534db9c54aSStoyan Gaydarov __FILE__, __LINE__, __func__); \ 543dcf5451SChristoph Hellwig printk(KERN_DEBUG f, ## a); \ 553dcf5451SChristoph Hellwig } while (0) 563dcf5451SChristoph Hellwig #else 57ace36ad4SJoe Perches #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 583dcf5451SChristoph Hellwig #endif 593dcf5451SChristoph Hellwig 60273df556SFrank Mayhar #define EXT4_ERROR_INODE(inode, fmt, a...) \ 61c398eda0STheodore Ts'o ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 62c398eda0STheodore Ts'o 63c398eda0STheodore Ts'o #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 64c398eda0STheodore Ts'o ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 65273df556SFrank Mayhar 66f7c21177STheodore Ts'o #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 67f7c21177STheodore Ts'o ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 68273df556SFrank Mayhar 69d444c3c3STheodore Ts'o /* data type for block offset of block group */ 70d444c3c3STheodore Ts'o typedef int ext4_grpblk_t; 71d444c3c3STheodore Ts'o 72d444c3c3STheodore Ts'o /* data type for filesystem-wide blocks number */ 73d444c3c3STheodore Ts'o typedef unsigned long long ext4_fsblk_t; 74d444c3c3STheodore Ts'o 75d444c3c3STheodore Ts'o /* data type for file logical block number */ 76d444c3c3STheodore Ts'o typedef __u32 ext4_lblk_t; 77d444c3c3STheodore Ts'o 78d444c3c3STheodore Ts'o /* data type for block group number */ 79d444c3c3STheodore Ts'o typedef unsigned int ext4_group_t; 80d444c3c3STheodore Ts'o 81296c355cSTheodore Ts'o /* 82296c355cSTheodore Ts'o * Flags used in mballoc's allocation_context flags field. 83296c355cSTheodore Ts'o * 84296c355cSTheodore Ts'o * Also used to show what's going on for debugging purposes when the 85296c355cSTheodore Ts'o * flag field is exported via the traceport interface 86296c355cSTheodore Ts'o */ 87d444c3c3STheodore Ts'o 883dcf5451SChristoph Hellwig /* prefer goal again. length */ 890ef90db9STheodore Ts'o #define EXT4_MB_HINT_MERGE 0x0001 903dcf5451SChristoph Hellwig /* blocks already reserved */ 910ef90db9STheodore Ts'o #define EXT4_MB_HINT_RESERVED 0x0002 923dcf5451SChristoph Hellwig /* metadata is being allocated */ 930ef90db9STheodore Ts'o #define EXT4_MB_HINT_METADATA 0x0004 943dcf5451SChristoph Hellwig /* first blocks in the file */ 950ef90db9STheodore Ts'o #define EXT4_MB_HINT_FIRST 0x0008 963dcf5451SChristoph Hellwig /* search for the best chunk */ 970ef90db9STheodore Ts'o #define EXT4_MB_HINT_BEST 0x0010 983dcf5451SChristoph Hellwig /* data is being allocated */ 990ef90db9STheodore Ts'o #define EXT4_MB_HINT_DATA 0x0020 1003dcf5451SChristoph Hellwig /* don't preallocate (for tails) */ 1010ef90db9STheodore Ts'o #define EXT4_MB_HINT_NOPREALLOC 0x0040 1023dcf5451SChristoph Hellwig /* allocate for locality group */ 1030ef90db9STheodore Ts'o #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 1043dcf5451SChristoph Hellwig /* allocate goal blocks or none */ 1050ef90db9STheodore Ts'o #define EXT4_MB_HINT_GOAL_ONLY 0x0100 1063dcf5451SChristoph Hellwig /* goal is meaningful */ 1070ef90db9STheodore Ts'o #define EXT4_MB_HINT_TRY_GOAL 0x0200 108d2a17637SMingming Cao /* blocks already pre-reserved by delayed allocation */ 1090ef90db9STheodore Ts'o #define EXT4_MB_DELALLOC_RESERVED 0x0400 1104ba74d00STheodore Ts'o /* We are doing stream allocation */ 1114ba74d00STheodore Ts'o #define EXT4_MB_STREAM_ALLOC 0x0800 11255f020dbSAllison Henderson /* Use reserved root blocks if needed */ 11355f020dbSAllison Henderson #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 1143dcf5451SChristoph Hellwig 1153dcf5451SChristoph Hellwig struct ext4_allocation_request { 1163dcf5451SChristoph Hellwig /* target inode for block we're allocating */ 1173dcf5451SChristoph Hellwig struct inode *inode; 1183dcf5451SChristoph Hellwig /* how many blocks we want to allocate */ 119498e5f24STheodore Ts'o unsigned int len; 120726447d8SEric Sandeen /* logical block in target inode */ 121726447d8SEric Sandeen ext4_lblk_t logical; 122726447d8SEric Sandeen /* the closest logical allocated block to the left */ 123726447d8SEric Sandeen ext4_lblk_t lleft; 124726447d8SEric Sandeen /* the closest logical allocated block to the right */ 125726447d8SEric Sandeen ext4_lblk_t lright; 126726447d8SEric Sandeen /* phys. target (a hint) */ 127726447d8SEric Sandeen ext4_fsblk_t goal; 128726447d8SEric Sandeen /* phys. block for the closest logical allocated block to the left */ 129726447d8SEric Sandeen ext4_fsblk_t pleft; 130726447d8SEric Sandeen /* phys. block for the closest logical allocated block to the right */ 131726447d8SEric Sandeen ext4_fsblk_t pright; 1323dcf5451SChristoph Hellwig /* flags. see above EXT4_MB_HINT_* */ 133498e5f24STheodore Ts'o unsigned int flags; 1343dcf5451SChristoph Hellwig }; 1353dcf5451SChristoph Hellwig 1363dcf5451SChristoph Hellwig /* 137e35fd660STheodore Ts'o * Logical to physical block mapping, used by ext4_map_blocks() 138e35fd660STheodore Ts'o * 139e35fd660STheodore Ts'o * This structure is used to pass requests into ext4_map_blocks() as 140e35fd660STheodore Ts'o * well as to store the information returned by ext4_map_blocks(). It 141e35fd660STheodore Ts'o * takes less room on the stack than a struct buffer_head. 142e35fd660STheodore Ts'o */ 143e35fd660STheodore Ts'o #define EXT4_MAP_NEW (1 << BH_New) 144e35fd660STheodore Ts'o #define EXT4_MAP_MAPPED (1 << BH_Mapped) 145e35fd660STheodore Ts'o #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 146e35fd660STheodore Ts'o #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 147e35fd660STheodore Ts'o #define EXT4_MAP_UNINIT (1 << BH_Uninit) 1487b415bf6SAditya Kali /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of 1497b415bf6SAditya Kali * ext4_map_blocks wants to know whether or not the underlying cluster has 1507b415bf6SAditya Kali * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that 1517b415bf6SAditya Kali * the requested mapping was from previously mapped (or delayed allocated) 1527b415bf6SAditya Kali * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster 1537b415bf6SAditya Kali * should never appear on buffer_head's state flags. 1547b415bf6SAditya Kali */ 1557b415bf6SAditya Kali #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster) 156e35fd660STheodore Ts'o #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 157e35fd660STheodore Ts'o EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 1587b415bf6SAditya Kali EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER) 159e35fd660STheodore Ts'o 160e35fd660STheodore Ts'o struct ext4_map_blocks { 161e35fd660STheodore Ts'o ext4_fsblk_t m_pblk; 162e35fd660STheodore Ts'o ext4_lblk_t m_lblk; 163e35fd660STheodore Ts'o unsigned int m_len; 164e35fd660STheodore Ts'o unsigned int m_flags; 165e35fd660STheodore Ts'o }; 166e35fd660STheodore Ts'o 167e35fd660STheodore Ts'o /* 168b3a3ca8cSTheodore Ts'o * For delayed allocation tracking 169b3a3ca8cSTheodore Ts'o */ 170b3a3ca8cSTheodore Ts'o struct mpage_da_data { 171b3a3ca8cSTheodore Ts'o struct inode *inode; 172b3a3ca8cSTheodore Ts'o sector_t b_blocknr; /* start block number of extent */ 173b3a3ca8cSTheodore Ts'o size_t b_size; /* size of extent */ 174b3a3ca8cSTheodore Ts'o unsigned long b_state; /* state of the extent */ 175b3a3ca8cSTheodore Ts'o unsigned long first_page, next_page; /* extent of pages */ 176b3a3ca8cSTheodore Ts'o struct writeback_control *wbc; 177b3a3ca8cSTheodore Ts'o int io_done; 178b3a3ca8cSTheodore Ts'o int pages_written; 179b3a3ca8cSTheodore Ts'o int retval; 180b3a3ca8cSTheodore Ts'o }; 181bd2d0210STheodore Ts'o 182bd2d0210STheodore Ts'o /* 183bd2d0210STheodore Ts'o * Flags for ext4_io_end->flags 184bd2d0210STheodore Ts'o */ 185bd2d0210STheodore Ts'o #define EXT4_IO_END_UNWRITTEN 0x0001 186bd2d0210STheodore Ts'o #define EXT4_IO_END_ERROR 0x0002 1878c0bec21SJiaying Zhang #define EXT4_IO_END_QUEUED 0x0004 188266991b1SJeff Moyer #define EXT4_IO_END_DIRECT 0x0008 189491caa43SJeff Moyer #define EXT4_IO_END_IN_FSYNC 0x0010 190bd2d0210STheodore Ts'o 191bd2d0210STheodore Ts'o struct ext4_io_page { 192bd2d0210STheodore Ts'o struct page *p_page; 19383668e71STheodore Ts'o atomic_t p_count; 194bd2d0210STheodore Ts'o }; 195bd2d0210STheodore Ts'o 196bd2d0210STheodore Ts'o #define MAX_IO_PAGES 128 197bd2d0210STheodore Ts'o 1984188188bSCurt Wohlgemuth /* 1994188188bSCurt Wohlgemuth * For converting uninitialized extents on a work queue. 2004188188bSCurt Wohlgemuth * 2014188188bSCurt Wohlgemuth * 'page' is only used from the writepage() path; 'pages' is only used for 2024188188bSCurt Wohlgemuth * buffered writes; they are used to keep page references until conversion 2034188188bSCurt Wohlgemuth * takes place. For AIO/DIO, neither field is filled in. 2044188188bSCurt Wohlgemuth */ 2050031462bSMingming Cao typedef struct ext4_io_end { 2065b3ff237Sjiayingz@google.com (Jiaying Zhang) struct list_head list; /* per-file finished IO list */ 2070031462bSMingming Cao struct inode *inode; /* file being written to */ 2088d5d02e6SMingming Cao unsigned int flag; /* unwritten or not */ 2094188188bSCurt Wohlgemuth struct page *page; /* for writepage() path */ 210a1de02dcSEric Sandeen loff_t offset; /* offset in the file */ 211a1de02dcSEric Sandeen ssize_t size; /* size of the extent */ 2120031462bSMingming Cao struct work_struct work; /* data work queue */ 2135b3ff237Sjiayingz@google.com (Jiaying Zhang) struct kiocb *iocb; /* iocb struct for AIO */ 2145b3ff237Sjiayingz@google.com (Jiaying Zhang) int result; /* error value for AIO */ 2154188188bSCurt Wohlgemuth int num_io_pages; /* for writepages() */ 2164188188bSCurt Wohlgemuth struct ext4_io_page *pages[MAX_IO_PAGES]; /* for writepages() */ 2170031462bSMingming Cao } ext4_io_end_t; 2180031462bSMingming Cao 219bd2d0210STheodore Ts'o struct ext4_io_submit { 220bd2d0210STheodore Ts'o int io_op; 221bd2d0210STheodore Ts'o struct bio *io_bio; 222bd2d0210STheodore Ts'o ext4_io_end_t *io_end; 223bd2d0210STheodore Ts'o struct ext4_io_page *io_page; 224bd2d0210STheodore Ts'o sector_t io_next_block; 225bd2d0210STheodore Ts'o }; 226bd2d0210STheodore Ts'o 227b3a3ca8cSTheodore Ts'o /* 2283dcf5451SChristoph Hellwig * Special inodes numbers 2293dcf5451SChristoph Hellwig */ 2303dcf5451SChristoph Hellwig #define EXT4_BAD_INO 1 /* Bad blocks inode */ 2313dcf5451SChristoph Hellwig #define EXT4_ROOT_INO 2 /* Root inode */ 232ae812306SAditya Kali #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 233ae812306SAditya Kali #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 2343dcf5451SChristoph Hellwig #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 2353dcf5451SChristoph Hellwig #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 2363dcf5451SChristoph Hellwig #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 2373dcf5451SChristoph Hellwig #define EXT4_JOURNAL_INO 8 /* Journal inode */ 2383dcf5451SChristoph Hellwig 2393dcf5451SChristoph Hellwig /* First non-reserved inode for old ext4 filesystems */ 2403dcf5451SChristoph Hellwig #define EXT4_GOOD_OLD_FIRST_INO 11 2413dcf5451SChristoph Hellwig 2423dcf5451SChristoph Hellwig /* 2433dcf5451SChristoph Hellwig * Maximal count of links to a file 2443dcf5451SChristoph Hellwig */ 2453dcf5451SChristoph Hellwig #define EXT4_LINK_MAX 65000 2463dcf5451SChristoph Hellwig 2473dcf5451SChristoph Hellwig /* 2483dcf5451SChristoph Hellwig * Macro-instructions used to manage several block sizes 2493dcf5451SChristoph Hellwig */ 2503dcf5451SChristoph Hellwig #define EXT4_MIN_BLOCK_SIZE 1024 2513dcf5451SChristoph Hellwig #define EXT4_MAX_BLOCK_SIZE 65536 2523dcf5451SChristoph Hellwig #define EXT4_MIN_BLOCK_LOG_SIZE 10 253fb1813f4SCurt Wohlgemuth #define EXT4_MAX_BLOCK_LOG_SIZE 16 2543dcf5451SChristoph Hellwig #ifdef __KERNEL__ 2553dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 2563dcf5451SChristoph Hellwig #else 2573dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 2583dcf5451SChristoph Hellwig #endif 2593dcf5451SChristoph Hellwig #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 260281b5995STheodore Ts'o #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 261281b5995STheodore Ts'o EXT4_SB(s)->s_cluster_bits) 2623dcf5451SChristoph Hellwig #ifdef __KERNEL__ 2633dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 264281b5995STheodore Ts'o # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 2653dcf5451SChristoph Hellwig #else 2663dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 2673dcf5451SChristoph Hellwig #endif 2683dcf5451SChristoph Hellwig #ifdef __KERNEL__ 2693dcf5451SChristoph Hellwig #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 2703dcf5451SChristoph Hellwig #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 2713dcf5451SChristoph Hellwig #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 2723dcf5451SChristoph Hellwig #else 2733dcf5451SChristoph Hellwig #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 2743dcf5451SChristoph Hellwig EXT4_GOOD_OLD_INODE_SIZE : \ 2753dcf5451SChristoph Hellwig (s)->s_inode_size) 2763dcf5451SChristoph Hellwig #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 2773dcf5451SChristoph Hellwig EXT4_GOOD_OLD_FIRST_INO : \ 2783dcf5451SChristoph Hellwig (s)->s_first_ino) 2793dcf5451SChristoph Hellwig #endif 2803dcf5451SChristoph Hellwig #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 2813dcf5451SChristoph Hellwig 282d5b8f310STheodore Ts'o /* Translate a block number to a cluster number */ 283d5b8f310STheodore Ts'o #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 284d5b8f310STheodore Ts'o /* Translate a cluster number to a block number */ 285d5b8f310STheodore Ts'o #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 286d5b8f310STheodore Ts'o /* Translate # of blks to # of clusters */ 287d5b8f310STheodore Ts'o #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 288d5b8f310STheodore Ts'o (sbi)->s_cluster_bits) 289d5b8f310STheodore Ts'o 2903dcf5451SChristoph Hellwig /* 2913dcf5451SChristoph Hellwig * Structure of a blocks group descriptor 2923dcf5451SChristoph Hellwig */ 2933dcf5451SChristoph Hellwig struct ext4_group_desc 2943dcf5451SChristoph Hellwig { 2953dcf5451SChristoph Hellwig __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 2963dcf5451SChristoph Hellwig __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 2973dcf5451SChristoph Hellwig __le32 bg_inode_table_lo; /* Inodes table block */ 298560671a0SAneesh Kumar K.V __le16 bg_free_blocks_count_lo;/* Free blocks count */ 299560671a0SAneesh Kumar K.V __le16 bg_free_inodes_count_lo;/* Free inodes count */ 300560671a0SAneesh Kumar K.V __le16 bg_used_dirs_count_lo; /* Directories count */ 3013dcf5451SChristoph Hellwig __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 302e6153918SDarrick J. Wong __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 303e6153918SDarrick J. Wong __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 304e6153918SDarrick J. Wong __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 305560671a0SAneesh Kumar K.V __le16 bg_itable_unused_lo; /* Unused inodes count */ 3063dcf5451SChristoph Hellwig __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 3073dcf5451SChristoph Hellwig __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 3083dcf5451SChristoph Hellwig __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 3093dcf5451SChristoph Hellwig __le32 bg_inode_table_hi; /* Inodes table block MSB */ 3103dcf5451SChristoph Hellwig __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 3113dcf5451SChristoph Hellwig __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 3123dcf5451SChristoph Hellwig __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 3133dcf5451SChristoph Hellwig __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 314e6153918SDarrick J. Wong __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 315e6153918SDarrick J. Wong __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 316e6153918SDarrick J. Wong __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 317e6153918SDarrick J. Wong __u32 bg_reserved; 3183dcf5451SChristoph Hellwig }; 3193dcf5451SChristoph Hellwig 32041a246d1SDarrick J. Wong #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 32141a246d1SDarrick J. Wong (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 32241a246d1SDarrick J. Wong sizeof(__le16)) 32341a246d1SDarrick J. Wong #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 32441a246d1SDarrick J. Wong (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 32541a246d1SDarrick J. Wong sizeof(__le16)) 32641a246d1SDarrick J. Wong 327772cb7c8SJose R. Santos /* 328772cb7c8SJose R. Santos * Structure of a flex block group info 329772cb7c8SJose R. Santos */ 330772cb7c8SJose R. Santos 331772cb7c8SJose R. Santos struct flex_groups { 3329f24e420STheodore Ts'o atomic_t free_inodes; 33324aaa8efSTheodore Ts'o atomic_t free_clusters; 3347d39db14STheodore Ts'o atomic_t used_dirs; 335772cb7c8SJose R. Santos }; 336772cb7c8SJose R. Santos 3373dcf5451SChristoph Hellwig #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 3383dcf5451SChristoph Hellwig #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 3393dcf5451SChristoph Hellwig #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 3403dcf5451SChristoph Hellwig 3413dcf5451SChristoph Hellwig /* 3423dcf5451SChristoph Hellwig * Macro-instructions used to manage group descriptors 3433dcf5451SChristoph Hellwig */ 3443dcf5451SChristoph Hellwig #define EXT4_MIN_DESC_SIZE 32 3453dcf5451SChristoph Hellwig #define EXT4_MIN_DESC_SIZE_64BIT 64 3463dcf5451SChristoph Hellwig #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 3473dcf5451SChristoph Hellwig #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 3483dcf5451SChristoph Hellwig #ifdef __KERNEL__ 3493dcf5451SChristoph Hellwig # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 350281b5995STheodore Ts'o # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 3513dcf5451SChristoph Hellwig # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 3523dcf5451SChristoph Hellwig # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 3533dcf5451SChristoph Hellwig # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 3543dcf5451SChristoph Hellwig #else 3553dcf5451SChristoph Hellwig # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 3563dcf5451SChristoph Hellwig # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 3573dcf5451SChristoph Hellwig # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 3583dcf5451SChristoph Hellwig #endif 3593dcf5451SChristoph Hellwig 3603dcf5451SChristoph Hellwig /* 3613dcf5451SChristoph Hellwig * Constants relative to the data blocks 3623dcf5451SChristoph Hellwig */ 3633dcf5451SChristoph Hellwig #define EXT4_NDIR_BLOCKS 12 3643dcf5451SChristoph Hellwig #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 3653dcf5451SChristoph Hellwig #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 3663dcf5451SChristoph Hellwig #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 3673dcf5451SChristoph Hellwig #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 3683dcf5451SChristoph Hellwig 3693dcf5451SChristoph Hellwig /* 3703dcf5451SChristoph Hellwig * Inode flags 3713dcf5451SChristoph Hellwig */ 3723dcf5451SChristoph Hellwig #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 3733dcf5451SChristoph Hellwig #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 3743dcf5451SChristoph Hellwig #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 3753dcf5451SChristoph Hellwig #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 3763dcf5451SChristoph Hellwig #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 3773dcf5451SChristoph Hellwig #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 3783dcf5451SChristoph Hellwig #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 3793dcf5451SChristoph Hellwig #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 3803dcf5451SChristoph Hellwig /* Reserved for compression usage... */ 3813dcf5451SChristoph Hellwig #define EXT4_DIRTY_FL 0x00000100 3823dcf5451SChristoph Hellwig #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 3833dcf5451SChristoph Hellwig #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 3843dcf5451SChristoph Hellwig #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 3853dcf5451SChristoph Hellwig /* End compression flags --- maybe not all used */ 3863dcf5451SChristoph Hellwig #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 3873dcf5451SChristoph Hellwig #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 3883dcf5451SChristoph Hellwig #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 3893dcf5451SChristoph Hellwig #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 3903dcf5451SChristoph Hellwig #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 3913dcf5451SChristoph Hellwig #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 3923dcf5451SChristoph Hellwig #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 3933dcf5451SChristoph Hellwig #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 394f710b4b9STheodore Ts'o #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 395c8d46e41SJiaying Zhang #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 3963dcf5451SChristoph Hellwig #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 3973dcf5451SChristoph Hellwig 398c8d46e41SJiaying Zhang #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 399c8d46e41SJiaying Zhang #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 4003dcf5451SChristoph Hellwig 4018fa43a81SDuane Griffin /* Flags that should be inherited by new inodes from their parent. */ 4028fa43a81SDuane Griffin #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 4031cd9f097STheodore Ts'o EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 4048fa43a81SDuane Griffin EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 4058fa43a81SDuane Griffin EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 4068fa43a81SDuane Griffin 4072dc6b0d4SDuane Griffin /* Flags that are appropriate for regular files (all but dir-specific ones). */ 4082dc6b0d4SDuane Griffin #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 4092dc6b0d4SDuane Griffin 4102dc6b0d4SDuane Griffin /* Flags that are appropriate for non-directories/regular files. */ 4112dc6b0d4SDuane Griffin #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 4122dc6b0d4SDuane Griffin 4132dc6b0d4SDuane Griffin /* Mask out flags that are inappropriate for the given type of inode. */ 4142dc6b0d4SDuane Griffin static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 4152dc6b0d4SDuane Griffin { 4162dc6b0d4SDuane Griffin if (S_ISDIR(mode)) 4172dc6b0d4SDuane Griffin return flags; 4182dc6b0d4SDuane Griffin else if (S_ISREG(mode)) 4192dc6b0d4SDuane Griffin return flags & EXT4_REG_FLMASK; 4202dc6b0d4SDuane Griffin else 4212dc6b0d4SDuane Griffin return flags & EXT4_OTHER_FLMASK; 4222dc6b0d4SDuane Griffin } 4232dc6b0d4SDuane Griffin 42412e9b892SDmitry Monakhov /* 42512e9b892SDmitry Monakhov * Inode flags used for atomic set/get 42612e9b892SDmitry Monakhov */ 42712e9b892SDmitry Monakhov enum { 42812e9b892SDmitry Monakhov EXT4_INODE_SECRM = 0, /* Secure deletion */ 42912e9b892SDmitry Monakhov EXT4_INODE_UNRM = 1, /* Undelete */ 43012e9b892SDmitry Monakhov EXT4_INODE_COMPR = 2, /* Compress file */ 43112e9b892SDmitry Monakhov EXT4_INODE_SYNC = 3, /* Synchronous updates */ 43212e9b892SDmitry Monakhov EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 43312e9b892SDmitry Monakhov EXT4_INODE_APPEND = 5, /* writes to file may only append */ 43412e9b892SDmitry Monakhov EXT4_INODE_NODUMP = 6, /* do not dump file */ 43512e9b892SDmitry Monakhov EXT4_INODE_NOATIME = 7, /* do not update atime */ 43612e9b892SDmitry Monakhov /* Reserved for compression usage... */ 43712e9b892SDmitry Monakhov EXT4_INODE_DIRTY = 8, 43812e9b892SDmitry Monakhov EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 43912e9b892SDmitry Monakhov EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 44012e9b892SDmitry Monakhov EXT4_INODE_ECOMPR = 11, /* Compression error */ 44112e9b892SDmitry Monakhov /* End compression flags --- maybe not all used */ 44212e9b892SDmitry Monakhov EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 44312e9b892SDmitry Monakhov EXT4_INODE_IMAGIC = 13, /* AFS directory */ 44412e9b892SDmitry Monakhov EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 44512e9b892SDmitry Monakhov EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 44612e9b892SDmitry Monakhov EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 44712e9b892SDmitry Monakhov EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 44812e9b892SDmitry Monakhov EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 44912e9b892SDmitry Monakhov EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 45012e9b892SDmitry Monakhov EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 45112e9b892SDmitry Monakhov EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 45212e9b892SDmitry Monakhov EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 45312e9b892SDmitry Monakhov }; 45412e9b892SDmitry Monakhov 45512e9b892SDmitry Monakhov #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 45612e9b892SDmitry Monakhov #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \ 45712e9b892SDmitry Monakhov printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \ 45812e9b892SDmitry Monakhov EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); } 45912e9b892SDmitry Monakhov 46012e9b892SDmitry Monakhov /* 46112e9b892SDmitry Monakhov * Since it's pretty easy to mix up bit numbers and hex values, and we 46212e9b892SDmitry Monakhov * can't do a compile-time test for ENUM values, we use a run-time 46312e9b892SDmitry Monakhov * test to make sure that EXT4_XXX_FL is consistent with respect to 46412e9b892SDmitry Monakhov * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop 46512e9b892SDmitry Monakhov * out so it won't cost any extra space in the compiled kernel image. 46612e9b892SDmitry Monakhov * But it's important that these values are the same, since we are 46712e9b892SDmitry Monakhov * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL 46812e9b892SDmitry Monakhov * must be consistent with the values of FS_XXX_FL defined in 46912e9b892SDmitry Monakhov * include/linux/fs.h and the on-disk values found in ext2, ext3, and 47012e9b892SDmitry Monakhov * ext4 filesystems, and of course the values defined in e2fsprogs. 47112e9b892SDmitry Monakhov * 47212e9b892SDmitry Monakhov * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 47312e9b892SDmitry Monakhov */ 47412e9b892SDmitry Monakhov static inline void ext4_check_flag_values(void) 47512e9b892SDmitry Monakhov { 47612e9b892SDmitry Monakhov CHECK_FLAG_VALUE(SECRM); 47712e9b892SDmitry Monakhov CHECK_FLAG_VALUE(UNRM); 47812e9b892SDmitry Monakhov CHECK_FLAG_VALUE(COMPR); 47912e9b892SDmitry Monakhov CHECK_FLAG_VALUE(SYNC); 48012e9b892SDmitry Monakhov CHECK_FLAG_VALUE(IMMUTABLE); 48112e9b892SDmitry Monakhov CHECK_FLAG_VALUE(APPEND); 48212e9b892SDmitry Monakhov CHECK_FLAG_VALUE(NODUMP); 48312e9b892SDmitry Monakhov CHECK_FLAG_VALUE(NOATIME); 48412e9b892SDmitry Monakhov CHECK_FLAG_VALUE(DIRTY); 48512e9b892SDmitry Monakhov CHECK_FLAG_VALUE(COMPRBLK); 48612e9b892SDmitry Monakhov CHECK_FLAG_VALUE(NOCOMPR); 48712e9b892SDmitry Monakhov CHECK_FLAG_VALUE(ECOMPR); 48812e9b892SDmitry Monakhov CHECK_FLAG_VALUE(INDEX); 48912e9b892SDmitry Monakhov CHECK_FLAG_VALUE(IMAGIC); 49012e9b892SDmitry Monakhov CHECK_FLAG_VALUE(JOURNAL_DATA); 49112e9b892SDmitry Monakhov CHECK_FLAG_VALUE(NOTAIL); 49212e9b892SDmitry Monakhov CHECK_FLAG_VALUE(DIRSYNC); 49312e9b892SDmitry Monakhov CHECK_FLAG_VALUE(TOPDIR); 49412e9b892SDmitry Monakhov CHECK_FLAG_VALUE(HUGE_FILE); 49512e9b892SDmitry Monakhov CHECK_FLAG_VALUE(EXTENTS); 49612e9b892SDmitry Monakhov CHECK_FLAG_VALUE(EA_INODE); 49712e9b892SDmitry Monakhov CHECK_FLAG_VALUE(EOFBLOCKS); 49812e9b892SDmitry Monakhov CHECK_FLAG_VALUE(RESERVED); 49912e9b892SDmitry Monakhov } 50012e9b892SDmitry Monakhov 5013dcf5451SChristoph Hellwig /* Used to pass group descriptor data when online resize is done */ 5023dcf5451SChristoph Hellwig struct ext4_new_group_input { 5033dcf5451SChristoph Hellwig __u32 group; /* Group number for this data */ 5043dcf5451SChristoph Hellwig __u64 block_bitmap; /* Absolute block number of block bitmap */ 5053dcf5451SChristoph Hellwig __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 5063dcf5451SChristoph Hellwig __u64 inode_table; /* Absolute block number of inode table start */ 5073dcf5451SChristoph Hellwig __u32 blocks_count; /* Total number of blocks in this group */ 5083dcf5451SChristoph Hellwig __u16 reserved_blocks; /* Number of reserved blocks in this group */ 5093dcf5451SChristoph Hellwig __u16 unused; 5103dcf5451SChristoph Hellwig }; 5113dcf5451SChristoph Hellwig 5124d92dc0fSBen Hutchings #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 5134d92dc0fSBen Hutchings struct compat_ext4_new_group_input { 5144d92dc0fSBen Hutchings u32 group; 5154d92dc0fSBen Hutchings compat_u64 block_bitmap; 5164d92dc0fSBen Hutchings compat_u64 inode_bitmap; 5174d92dc0fSBen Hutchings compat_u64 inode_table; 5184d92dc0fSBen Hutchings u32 blocks_count; 5194d92dc0fSBen Hutchings u16 reserved_blocks; 5204d92dc0fSBen Hutchings u16 unused; 5214d92dc0fSBen Hutchings }; 5224d92dc0fSBen Hutchings #endif 5234d92dc0fSBen Hutchings 5243dcf5451SChristoph Hellwig /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 5253dcf5451SChristoph Hellwig struct ext4_new_group_data { 5263dcf5451SChristoph Hellwig __u32 group; 5273dcf5451SChristoph Hellwig __u64 block_bitmap; 5283dcf5451SChristoph Hellwig __u64 inode_bitmap; 5293dcf5451SChristoph Hellwig __u64 inode_table; 5303dcf5451SChristoph Hellwig __u32 blocks_count; 5313dcf5451SChristoph Hellwig __u16 reserved_blocks; 5323dcf5451SChristoph Hellwig __u16 unused; 5333dcf5451SChristoph Hellwig __u32 free_blocks_count; 5343dcf5451SChristoph Hellwig }; 5353dcf5451SChristoph Hellwig 53633afdcc5SYongqiang Yang /* Indexes used to index group tables in ext4_new_group_data */ 53733afdcc5SYongqiang Yang enum { 53833afdcc5SYongqiang Yang BLOCK_BITMAP = 0, /* block bitmap */ 53933afdcc5SYongqiang Yang INODE_BITMAP, /* inode bitmap */ 54033afdcc5SYongqiang Yang INODE_TABLE, /* inode tables */ 54133afdcc5SYongqiang Yang GROUP_TABLE_COUNT, 54233afdcc5SYongqiang Yang }; 54333afdcc5SYongqiang Yang 5443dcf5451SChristoph Hellwig /* 54579e83036SEric Sandeen * Flags used by ext4_map_blocks() 5463dcf5451SChristoph Hellwig */ 547c2177057STheodore Ts'o /* Allocate any needed blocks and/or convert an unitialized 548c2177057STheodore Ts'o extent to be an initialized ext4 */ 5492ac3b6e0STheodore Ts'o #define EXT4_GET_BLOCKS_CREATE 0x0001 550c2177057STheodore Ts'o /* Request the creation of an unitialized extent */ 5512ac3b6e0STheodore Ts'o #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 552c2177057STheodore Ts'o #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 553c2177057STheodore Ts'o EXT4_GET_BLOCKS_CREATE) 554c2177057STheodore Ts'o /* Caller is from the delayed allocation writeout path, 5552ac3b6e0STheodore Ts'o so set the magic i_delalloc_reserve_flag after taking the 5562ac3b6e0STheodore Ts'o inode allocation semaphore for */ 55703f5d8bcSJan Kara #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 5580031462bSMingming Cao /* caller is from the direct IO path, request to creation of an 5590031462bSMingming Cao unitialized extents if not allocated, split the uninitialized 5600031462bSMingming Cao extent if blocks has been preallocated already*/ 561c7064ef1SJiaying Zhang #define EXT4_GET_BLOCKS_PRE_IO 0x0008 5621296cc85SAneesh Kumar K.V #define EXT4_GET_BLOCKS_CONVERT 0x0010 563c7064ef1SJiaying Zhang #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 5640031462bSMingming Cao EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 565c7064ef1SJiaying Zhang /* Convert extent to initialized after IO complete */ 566c7064ef1SJiaying Zhang #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 567744692dcSJiaying Zhang EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 56855f020dbSAllison Henderson /* Punch out blocks of an extent */ 56955f020dbSAllison Henderson #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020 570556b27abSVivek Haldar /* Don't normalize allocation size (used for fallocate) */ 571556b27abSVivek Haldar #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 572a4e5d88bSDmitry Monakhov /* Request will not result in inode size update (user for fallocate) */ 573a4e5d88bSDmitry Monakhov #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 5743dcf5451SChristoph Hellwig 5753dcf5451SChristoph Hellwig /* 576e6362609STheodore Ts'o * Flags used by ext4_free_blocks 577e6362609STheodore Ts'o */ 578e6362609STheodore Ts'o #define EXT4_FREE_BLOCKS_METADATA 0x0001 579e6362609STheodore Ts'o #define EXT4_FREE_BLOCKS_FORGET 0x0002 5801f2acb60STheodore Ts'o #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 5817132de74SMaxim Patlasov #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 58284130193STheodore Ts'o #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 58384130193STheodore Ts'o #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 584e6362609STheodore Ts'o 585e6362609STheodore Ts'o /* 5864e96b2dbSAllison Henderson * Flags used by ext4_discard_partial_page_buffers 5874e96b2dbSAllison Henderson */ 5884e96b2dbSAllison Henderson #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001 5893dcf5451SChristoph Hellwig 5903dcf5451SChristoph Hellwig /* 5913dcf5451SChristoph Hellwig * ioctl commands 5923dcf5451SChristoph Hellwig */ 5933dcf5451SChristoph Hellwig #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 5943dcf5451SChristoph Hellwig #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 5953dcf5451SChristoph Hellwig #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 5963dcf5451SChristoph Hellwig #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 5973dcf5451SChristoph Hellwig #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 5983dcf5451SChristoph Hellwig #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 5993dcf5451SChristoph Hellwig #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 6003dcf5451SChristoph Hellwig #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 6018eea80d5STheodore Ts'o #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 6028eea80d5STheodore Ts'o #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 6038eea80d5STheodore Ts'o #define EXT4_IOC_MIGRATE _IO('f', 9) 604ccd2506bSTheodore Ts'o /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 6058eea80d5STheodore Ts'o /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 606ccd2506bSTheodore Ts'o #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 607748de673SAkira Fujita #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 60819c5246dSYongqiang Yang #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 6093dcf5451SChristoph Hellwig 610899ad0ceSBen Hutchings #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 6113dcf5451SChristoph Hellwig /* 6123dcf5451SChristoph Hellwig * ioctl commands in 32 bit emulation 6133dcf5451SChristoph Hellwig */ 6143dcf5451SChristoph Hellwig #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 6153dcf5451SChristoph Hellwig #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 6163dcf5451SChristoph Hellwig #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 6173dcf5451SChristoph Hellwig #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 6183dcf5451SChristoph Hellwig #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 6193dcf5451SChristoph Hellwig #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 6203dcf5451SChristoph Hellwig #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 6214d92dc0fSBen Hutchings #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 6223dcf5451SChristoph Hellwig #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 6233dcf5451SChristoph Hellwig #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 624899ad0ceSBen Hutchings #endif 6253dcf5451SChristoph Hellwig 626b595076aSUwe Kleine-König /* Max physical block we can address w/o extents */ 627fb0a387dSEric Sandeen #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 628fb0a387dSEric Sandeen 6293dcf5451SChristoph Hellwig /* 6303dcf5451SChristoph Hellwig * Structure of an inode on the disk 6313dcf5451SChristoph Hellwig */ 6323dcf5451SChristoph Hellwig struct ext4_inode { 6333dcf5451SChristoph Hellwig __le16 i_mode; /* File mode */ 6343dcf5451SChristoph Hellwig __le16 i_uid; /* Low 16 bits of Owner Uid */ 6353dcf5451SChristoph Hellwig __le32 i_size_lo; /* Size in bytes */ 6363dcf5451SChristoph Hellwig __le32 i_atime; /* Access time */ 6373dcf5451SChristoph Hellwig __le32 i_ctime; /* Inode Change time */ 6383dcf5451SChristoph Hellwig __le32 i_mtime; /* Modification time */ 6393dcf5451SChristoph Hellwig __le32 i_dtime; /* Deletion Time */ 6403dcf5451SChristoph Hellwig __le16 i_gid; /* Low 16 bits of Group Id */ 6413dcf5451SChristoph Hellwig __le16 i_links_count; /* Links count */ 6423dcf5451SChristoph Hellwig __le32 i_blocks_lo; /* Blocks count */ 6433dcf5451SChristoph Hellwig __le32 i_flags; /* File flags */ 6443dcf5451SChristoph Hellwig union { 6453dcf5451SChristoph Hellwig struct { 6463dcf5451SChristoph Hellwig __le32 l_i_version; 6473dcf5451SChristoph Hellwig } linux1; 6483dcf5451SChristoph Hellwig struct { 6493dcf5451SChristoph Hellwig __u32 h_i_translator; 6503dcf5451SChristoph Hellwig } hurd1; 6513dcf5451SChristoph Hellwig struct { 6523dcf5451SChristoph Hellwig __u32 m_i_reserved1; 6533dcf5451SChristoph Hellwig } masix1; 6543dcf5451SChristoph Hellwig } osd1; /* OS dependent 1 */ 6553dcf5451SChristoph Hellwig __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 6563dcf5451SChristoph Hellwig __le32 i_generation; /* File version (for NFS) */ 6573dcf5451SChristoph Hellwig __le32 i_file_acl_lo; /* File ACL */ 6583dcf5451SChristoph Hellwig __le32 i_size_high; 6593dcf5451SChristoph Hellwig __le32 i_obso_faddr; /* Obsoleted fragment address */ 6603dcf5451SChristoph Hellwig union { 6613dcf5451SChristoph Hellwig struct { 6623dcf5451SChristoph Hellwig __le16 l_i_blocks_high; /* were l_i_reserved1 */ 6633dcf5451SChristoph Hellwig __le16 l_i_file_acl_high; 6643dcf5451SChristoph Hellwig __le16 l_i_uid_high; /* these 2 fields */ 6653dcf5451SChristoph Hellwig __le16 l_i_gid_high; /* were reserved2[0] */ 666e6153918SDarrick J. Wong __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 667e6153918SDarrick J. Wong __le16 l_i_reserved; 6683dcf5451SChristoph Hellwig } linux2; 6693dcf5451SChristoph Hellwig struct { 6703dcf5451SChristoph Hellwig __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 6713dcf5451SChristoph Hellwig __u16 h_i_mode_high; 6723dcf5451SChristoph Hellwig __u16 h_i_uid_high; 6733dcf5451SChristoph Hellwig __u16 h_i_gid_high; 6743dcf5451SChristoph Hellwig __u32 h_i_author; 6753dcf5451SChristoph Hellwig } hurd2; 6763dcf5451SChristoph Hellwig struct { 6773dcf5451SChristoph Hellwig __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 6783dcf5451SChristoph Hellwig __le16 m_i_file_acl_high; 6793dcf5451SChristoph Hellwig __u32 m_i_reserved2[2]; 6803dcf5451SChristoph Hellwig } masix2; 6813dcf5451SChristoph Hellwig } osd2; /* OS dependent 2 */ 6823dcf5451SChristoph Hellwig __le16 i_extra_isize; 683e6153918SDarrick J. Wong __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 6843dcf5451SChristoph Hellwig __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 6853dcf5451SChristoph Hellwig __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 6863dcf5451SChristoph Hellwig __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 6873dcf5451SChristoph Hellwig __le32 i_crtime; /* File Creation time */ 6883dcf5451SChristoph Hellwig __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 6893dcf5451SChristoph Hellwig __le32 i_version_hi; /* high 32 bits for 64-bit version */ 6903dcf5451SChristoph Hellwig }; 6913dcf5451SChristoph Hellwig 692748de673SAkira Fujita struct move_extent { 693748de673SAkira Fujita __u32 reserved; /* should be zero */ 694748de673SAkira Fujita __u32 donor_fd; /* donor file descriptor */ 695748de673SAkira Fujita __u64 orig_start; /* logical start offset in block for orig */ 696748de673SAkira Fujita __u64 donor_start; /* logical start offset in block for donor */ 697748de673SAkira Fujita __u64 len; /* block length to be moved */ 698748de673SAkira Fujita __u64 moved_len; /* moved block length */ 699748de673SAkira Fujita }; 7003dcf5451SChristoph Hellwig 7013dcf5451SChristoph Hellwig #define EXT4_EPOCH_BITS 2 7023dcf5451SChristoph Hellwig #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 7033dcf5451SChristoph Hellwig #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 7043dcf5451SChristoph Hellwig 7053dcf5451SChristoph Hellwig /* 7063dcf5451SChristoph Hellwig * Extended fields will fit into an inode if the filesystem was formatted 7073dcf5451SChristoph Hellwig * with large inodes (-I 256 or larger) and there are not currently any EAs 7083dcf5451SChristoph Hellwig * consuming all of the available space. For new inodes we always reserve 7093dcf5451SChristoph Hellwig * enough space for the kernel's known extended fields, but for inodes 7103dcf5451SChristoph Hellwig * created with an old kernel this might not have been the case. None of 7113dcf5451SChristoph Hellwig * the extended inode fields is critical for correct filesystem operation. 7123dcf5451SChristoph Hellwig * This macro checks if a certain field fits in the inode. Note that 7133dcf5451SChristoph Hellwig * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 7143dcf5451SChristoph Hellwig */ 7153dcf5451SChristoph Hellwig #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 7163dcf5451SChristoph Hellwig ((offsetof(typeof(*ext4_inode), field) + \ 7173dcf5451SChristoph Hellwig sizeof((ext4_inode)->field)) \ 7183dcf5451SChristoph Hellwig <= (EXT4_GOOD_OLD_INODE_SIZE + \ 7193dcf5451SChristoph Hellwig (einode)->i_extra_isize)) \ 7203dcf5451SChristoph Hellwig 7213dcf5451SChristoph Hellwig static inline __le32 ext4_encode_extra_time(struct timespec *time) 7223dcf5451SChristoph Hellwig { 7233dcf5451SChristoph Hellwig return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 724c1fccc06STheodore Ts'o (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 725c1fccc06STheodore Ts'o ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 7263dcf5451SChristoph Hellwig } 7273dcf5451SChristoph Hellwig 7283dcf5451SChristoph Hellwig static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 7293dcf5451SChristoph Hellwig { 7303dcf5451SChristoph Hellwig if (sizeof(time->tv_sec) > 4) 7313dcf5451SChristoph Hellwig time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 7323dcf5451SChristoph Hellwig << 32; 733c1fccc06STheodore Ts'o time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 7343dcf5451SChristoph Hellwig } 7353dcf5451SChristoph Hellwig 7363dcf5451SChristoph Hellwig #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 7373dcf5451SChristoph Hellwig do { \ 7383dcf5451SChristoph Hellwig (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 7393dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 7403dcf5451SChristoph Hellwig (raw_inode)->xtime ## _extra = \ 7413dcf5451SChristoph Hellwig ext4_encode_extra_time(&(inode)->xtime); \ 7423dcf5451SChristoph Hellwig } while (0) 7433dcf5451SChristoph Hellwig 7443dcf5451SChristoph Hellwig #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 7453dcf5451SChristoph Hellwig do { \ 7463dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 7473dcf5451SChristoph Hellwig (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 7483dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 7493dcf5451SChristoph Hellwig (raw_inode)->xtime ## _extra = \ 7503dcf5451SChristoph Hellwig ext4_encode_extra_time(&(einode)->xtime); \ 7513dcf5451SChristoph Hellwig } while (0) 7523dcf5451SChristoph Hellwig 7533dcf5451SChristoph Hellwig #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 7543dcf5451SChristoph Hellwig do { \ 7553dcf5451SChristoph Hellwig (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 7563dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 7573dcf5451SChristoph Hellwig ext4_decode_extra_time(&(inode)->xtime, \ 7583dcf5451SChristoph Hellwig raw_inode->xtime ## _extra); \ 759af0b44a1SEric Sandeen else \ 760af0b44a1SEric Sandeen (inode)->xtime.tv_nsec = 0; \ 7613dcf5451SChristoph Hellwig } while (0) 7623dcf5451SChristoph Hellwig 7633dcf5451SChristoph Hellwig #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 7643dcf5451SChristoph Hellwig do { \ 7653dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 7663dcf5451SChristoph Hellwig (einode)->xtime.tv_sec = \ 7673dcf5451SChristoph Hellwig (signed)le32_to_cpu((raw_inode)->xtime); \ 7683dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 7693dcf5451SChristoph Hellwig ext4_decode_extra_time(&(einode)->xtime, \ 7703dcf5451SChristoph Hellwig raw_inode->xtime ## _extra); \ 771af0b44a1SEric Sandeen else \ 772af0b44a1SEric Sandeen (einode)->xtime.tv_nsec = 0; \ 7733dcf5451SChristoph Hellwig } while (0) 7743dcf5451SChristoph Hellwig 7753dcf5451SChristoph Hellwig #define i_disk_version osd1.linux1.l_i_version 7763dcf5451SChristoph Hellwig 7773dcf5451SChristoph Hellwig #if defined(__KERNEL__) || defined(__linux__) 7783dcf5451SChristoph Hellwig #define i_reserved1 osd1.linux1.l_i_reserved1 7793dcf5451SChristoph Hellwig #define i_file_acl_high osd2.linux2.l_i_file_acl_high 7803dcf5451SChristoph Hellwig #define i_blocks_high osd2.linux2.l_i_blocks_high 7813dcf5451SChristoph Hellwig #define i_uid_low i_uid 7823dcf5451SChristoph Hellwig #define i_gid_low i_gid 7833dcf5451SChristoph Hellwig #define i_uid_high osd2.linux2.l_i_uid_high 7843dcf5451SChristoph Hellwig #define i_gid_high osd2.linux2.l_i_gid_high 785e6153918SDarrick J. Wong #define i_checksum_lo osd2.linux2.l_i_checksum_lo 7863dcf5451SChristoph Hellwig 7873dcf5451SChristoph Hellwig #elif defined(__GNU__) 7883dcf5451SChristoph Hellwig 7893dcf5451SChristoph Hellwig #define i_translator osd1.hurd1.h_i_translator 7903dcf5451SChristoph Hellwig #define i_uid_high osd2.hurd2.h_i_uid_high 7913dcf5451SChristoph Hellwig #define i_gid_high osd2.hurd2.h_i_gid_high 7923dcf5451SChristoph Hellwig #define i_author osd2.hurd2.h_i_author 7933dcf5451SChristoph Hellwig 7943dcf5451SChristoph Hellwig #elif defined(__masix__) 7953dcf5451SChristoph Hellwig 7963dcf5451SChristoph Hellwig #define i_reserved1 osd1.masix1.m_i_reserved1 7973dcf5451SChristoph Hellwig #define i_file_acl_high osd2.masix2.m_i_file_acl_high 7983dcf5451SChristoph Hellwig #define i_reserved2 osd2.masix2.m_i_reserved2 7993dcf5451SChristoph Hellwig 8003dcf5451SChristoph Hellwig #endif /* defined(__KERNEL__) || defined(__linux__) */ 8013dcf5451SChristoph Hellwig 8023dcf5451SChristoph Hellwig /* 803d444c3c3STheodore Ts'o * storage for cached extent 804b05e6ae5STheodore Ts'o * If ec_len == 0, then the cache is invalid. 805b05e6ae5STheodore Ts'o * If ec_start == 0, then the cache represents a gap (null mapping) 806d444c3c3STheodore Ts'o */ 807d444c3c3STheodore Ts'o struct ext4_ext_cache { 808d444c3c3STheodore Ts'o ext4_fsblk_t ec_start; 809d444c3c3STheodore Ts'o ext4_lblk_t ec_block; 810d444c3c3STheodore Ts'o __u32 ec_len; /* must be 32bit to return holes */ 811d444c3c3STheodore Ts'o }; 812d444c3c3STheodore Ts'o 813d444c3c3STheodore Ts'o /* 814d444c3c3STheodore Ts'o * fourth extended file system inode data in memory 815d444c3c3STheodore Ts'o */ 816d444c3c3STheodore Ts'o struct ext4_inode_info { 817d444c3c3STheodore Ts'o __le32 i_data[15]; /* unconverted */ 818d444c3c3STheodore Ts'o __u32 i_dtime; 81912e9b892SDmitry Monakhov ext4_fsblk_t i_file_acl; 820d444c3c3STheodore Ts'o 821d444c3c3STheodore Ts'o /* 822d444c3c3STheodore Ts'o * i_block_group is the number of the block group which contains 823d444c3c3STheodore Ts'o * this file's inode. Constant across the lifetime of the inode, 824d444c3c3STheodore Ts'o * it is ued for making block allocation decisions - we try to 825d444c3c3STheodore Ts'o * place a file's data blocks near its inode block, and new inodes 826d444c3c3STheodore Ts'o * near to their parent directory's inode. 827d444c3c3STheodore Ts'o */ 828d444c3c3STheodore Ts'o ext4_group_t i_block_group; 8298a2005d3STheodore Ts'o ext4_lblk_t i_dir_start_lookup; 830353eb83cSTheodore Ts'o #if (BITS_PER_LONG < 64) 83119f5fb7aSTheodore Ts'o unsigned long i_state_flags; /* Dynamic state flags */ 832353eb83cSTheodore Ts'o #endif 83312e9b892SDmitry Monakhov unsigned long i_flags; 834d444c3c3STheodore Ts'o 835d444c3c3STheodore Ts'o #ifdef CONFIG_EXT4_FS_XATTR 836d444c3c3STheodore Ts'o /* 837d444c3c3STheodore Ts'o * Extended attributes can be read independently of the main file 838d444c3c3STheodore Ts'o * data. Taking i_mutex even when reading would cause contention 839d444c3c3STheodore Ts'o * between readers of EAs and writers of regular file data, so 840d444c3c3STheodore Ts'o * instead we synchronize on xattr_sem when reading or changing 841d444c3c3STheodore Ts'o * EAs. 842d444c3c3STheodore Ts'o */ 843d444c3c3STheodore Ts'o struct rw_semaphore xattr_sem; 844d444c3c3STheodore Ts'o #endif 845d444c3c3STheodore Ts'o 846d444c3c3STheodore Ts'o struct list_head i_orphan; /* unlinked but open inodes */ 847d444c3c3STheodore Ts'o 848d444c3c3STheodore Ts'o /* 849d444c3c3STheodore Ts'o * i_disksize keeps track of what the inode size is ON DISK, not 850d444c3c3STheodore Ts'o * in memory. During truncate, i_size is set to the new size by 851d444c3c3STheodore Ts'o * the VFS prior to calling ext4_truncate(), but the filesystem won't 852d444c3c3STheodore Ts'o * set i_disksize to 0 until the truncate is actually under way. 853d444c3c3STheodore Ts'o * 854d444c3c3STheodore Ts'o * The intent is that i_disksize always represents the blocks which 855d444c3c3STheodore Ts'o * are used by this file. This allows recovery to restart truncate 856d444c3c3STheodore Ts'o * on orphans if we crash during truncate. We actually write i_disksize 857d444c3c3STheodore Ts'o * into the on-disk inode when writing inodes out, instead of i_size. 858d444c3c3STheodore Ts'o * 859d444c3c3STheodore Ts'o * The only time when i_disksize and i_size may be different is when 860d444c3c3STheodore Ts'o * a truncate is in progress. The only things which change i_disksize 861d444c3c3STheodore Ts'o * are ext4_get_block (growth) and ext4_truncate (shrinkth). 862d444c3c3STheodore Ts'o */ 863d444c3c3STheodore Ts'o loff_t i_disksize; 864d444c3c3STheodore Ts'o 865d444c3c3STheodore Ts'o /* 866d444c3c3STheodore Ts'o * i_data_sem is for serialising ext4_truncate() against 867d444c3c3STheodore Ts'o * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 868d444c3c3STheodore Ts'o * data tree are chopped off during truncate. We can't do that in 869d444c3c3STheodore Ts'o * ext4 because whenever we perform intermediate commits during 870d444c3c3STheodore Ts'o * truncate, the inode and all the metadata blocks *must* be in a 871d444c3c3STheodore Ts'o * consistent state which allows truncation of the orphans to restart 872d444c3c3STheodore Ts'o * during recovery. Hence we must fix the get_block-vs-truncate race 873d444c3c3STheodore Ts'o * by other means, so we have i_data_sem. 874d444c3c3STheodore Ts'o */ 875d444c3c3STheodore Ts'o struct rw_semaphore i_data_sem; 876d444c3c3STheodore Ts'o struct inode vfs_inode; 8778aefcd55STheodore Ts'o struct jbd2_inode *jinode; 878d444c3c3STheodore Ts'o 879d444c3c3STheodore Ts'o struct ext4_ext_cache i_cached_extent; 880d444c3c3STheodore Ts'o /* 881d444c3c3STheodore Ts'o * File creation time. Its function is same as that of 882d444c3c3STheodore Ts'o * struct timespec i_{a,c,m}time in the generic inode. 883d444c3c3STheodore Ts'o */ 884d444c3c3STheodore Ts'o struct timespec i_crtime; 885d444c3c3STheodore Ts'o 886d444c3c3STheodore Ts'o /* mballoc */ 887d444c3c3STheodore Ts'o struct list_head i_prealloc_list; 888d444c3c3STheodore Ts'o spinlock_t i_prealloc_lock; 889d444c3c3STheodore Ts'o 890d444c3c3STheodore Ts'o /* ialloc */ 891d444c3c3STheodore Ts'o ext4_group_t i_last_alloc_group; 892d444c3c3STheodore Ts'o 893d444c3c3STheodore Ts'o /* allocation reservation info for delalloc */ 89457042651STheodore Ts'o /* In case of bigalloc, these refer to clusters rather than blocks */ 895d444c3c3STheodore Ts'o unsigned int i_reserved_data_blocks; 896d444c3c3STheodore Ts'o unsigned int i_reserved_meta_blocks; 897d444c3c3STheodore Ts'o unsigned int i_allocated_meta_blocks; 89801f49d0bSTheodore Ts'o ext4_lblk_t i_da_metadata_calc_last_lblock; 8999d0be502STheodore Ts'o int i_da_metadata_calc_len; 900d444c3c3STheodore Ts'o 901d444c3c3STheodore Ts'o /* on-disk additional length */ 902d444c3c3STheodore Ts'o __u16 i_extra_isize; 903d444c3c3STheodore Ts'o 904a9e7f447SDmitry Monakhov #ifdef CONFIG_QUOTA 905a9e7f447SDmitry Monakhov /* quota space reservation, managed internally by quota code */ 906a9e7f447SDmitry Monakhov qsize_t i_reserved_quota; 907a9e7f447SDmitry Monakhov #endif 9088d5d02e6SMingming Cao 909c7064ef1SJiaying Zhang /* completed IOs that might need unwritten extents handling */ 910c7064ef1SJiaying Zhang struct list_head i_completed_io_list; 911744692dcSJiaying Zhang spinlock_t i_completed_io_lock; 9128a2005d3STheodore Ts'o atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 9138d5d02e6SMingming Cao /* current io_end structure for async DIO write*/ 9148d5d02e6SMingming Cao ext4_io_end_t *cur_aio_dio; 915e9e3bcecSEric Sandeen atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */ 9168a2005d3STheodore Ts'o 9178a2005d3STheodore Ts'o spinlock_t i_block_reservation_lock; 918b436b9beSJan Kara 919b436b9beSJan Kara /* 920b436b9beSJan Kara * Transactions that contain inode's metadata needed to complete 921b436b9beSJan Kara * fsync and fdatasync, respectively. 922b436b9beSJan Kara */ 923b436b9beSJan Kara tid_t i_sync_tid; 924b436b9beSJan Kara tid_t i_datasync_tid; 925814525f4SDarrick J. Wong 926814525f4SDarrick J. Wong /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 927814525f4SDarrick J. Wong __u32 i_csum_seed; 928d444c3c3STheodore Ts'o }; 929d444c3c3STheodore Ts'o 930d444c3c3STheodore Ts'o /* 9313dcf5451SChristoph Hellwig * File system states 9323dcf5451SChristoph Hellwig */ 9333dcf5451SChristoph Hellwig #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 9343dcf5451SChristoph Hellwig #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 9353dcf5451SChristoph Hellwig #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 9363dcf5451SChristoph Hellwig 9373dcf5451SChristoph Hellwig /* 9383dcf5451SChristoph Hellwig * Misc. filesystem flags 9393dcf5451SChristoph Hellwig */ 9403dcf5451SChristoph Hellwig #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 9413dcf5451SChristoph Hellwig #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 9423dcf5451SChristoph Hellwig #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 9433dcf5451SChristoph Hellwig 9443dcf5451SChristoph Hellwig /* 9453dcf5451SChristoph Hellwig * Mount flags 9463dcf5451SChristoph Hellwig */ 9473dcf5451SChristoph Hellwig #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 9483dcf5451SChristoph Hellwig #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 9493dcf5451SChristoph Hellwig #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 9503dcf5451SChristoph Hellwig #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 9513dcf5451SChristoph Hellwig #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 95239ef17f1STheodore Ts'o #define EXT4_MOUNT_ERRORS_MASK 0x00070 9533dcf5451SChristoph Hellwig #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 9543dcf5451SChristoph Hellwig #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 9553dcf5451SChristoph Hellwig #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 9563dcf5451SChristoph Hellwig #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 9573dcf5451SChristoph Hellwig #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 9583dcf5451SChristoph Hellwig #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 9593dcf5451SChristoph Hellwig #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 9603dcf5451SChristoph Hellwig #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 9613dcf5451SChristoph Hellwig #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 9623dcf5451SChristoph Hellwig #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 963afd4672dSTheodore Ts'o #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 9643dcf5451SChristoph Hellwig #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 9653dcf5451SChristoph Hellwig #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 9663dcf5451SChristoph Hellwig #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 9673dcf5451SChristoph Hellwig #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 968744692dcSJiaying Zhang #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 969d4da6c9cSLinus Torvalds #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 9703dcf5451SChristoph Hellwig #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 9711449032bSTheodore Ts'o #define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */ 97264769240SAlex Tomas #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 9735bf5683aSHidehiro Kawai #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 9746fd058f7STheodore Ts'o #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 9755328e635SEric Sandeen #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 976bfff6873SLukas Czerner #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 9775bf5683aSHidehiro Kawai 97856889787STheodore Ts'o #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 97956889787STheodore Ts'o specified delalloc */ 98056889787STheodore Ts'o 981fd8c37ecSTheodore Ts'o #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 982fd8c37ecSTheodore Ts'o ~EXT4_MOUNT_##opt 983fd8c37ecSTheodore Ts'o #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 984fd8c37ecSTheodore Ts'o EXT4_MOUNT_##opt 9853dcf5451SChristoph Hellwig #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 9863dcf5451SChristoph Hellwig EXT4_MOUNT_##opt) 9873dcf5451SChristoph Hellwig 988a2595b8aSTheodore Ts'o #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 989a2595b8aSTheodore Ts'o ~EXT4_MOUNT2_##opt 990a2595b8aSTheodore Ts'o #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 991a2595b8aSTheodore Ts'o EXT4_MOUNT2_##opt 992a2595b8aSTheodore Ts'o #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 993a2595b8aSTheodore Ts'o EXT4_MOUNT2_##opt) 994a2595b8aSTheodore Ts'o 995597d508cSAkinobu Mita #define ext4_test_and_set_bit __test_and_set_bit_le 996597d508cSAkinobu Mita #define ext4_set_bit __set_bit_le 9973dcf5451SChristoph Hellwig #define ext4_set_bit_atomic ext2_set_bit_atomic 998597d508cSAkinobu Mita #define ext4_test_and_clear_bit __test_and_clear_bit_le 999597d508cSAkinobu Mita #define ext4_clear_bit __clear_bit_le 10003dcf5451SChristoph Hellwig #define ext4_clear_bit_atomic ext2_clear_bit_atomic 100150e0168cSAkinobu Mita #define ext4_test_bit test_bit_le 100250e0168cSAkinobu Mita #define ext4_find_next_zero_bit find_next_zero_bit_le 100350e0168cSAkinobu Mita #define ext4_find_next_bit find_next_bit_le 10043dcf5451SChristoph Hellwig 1005c3e94d1dSYongqiang Yang extern void ext4_set_bits(void *bm, int cur, int len); 1006c3e94d1dSYongqiang Yang 10073dcf5451SChristoph Hellwig /* 10083dcf5451SChristoph Hellwig * Maximal mount counts between two filesystem checks 10093dcf5451SChristoph Hellwig */ 10103dcf5451SChristoph Hellwig #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 10113dcf5451SChristoph Hellwig #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 10123dcf5451SChristoph Hellwig 10133dcf5451SChristoph Hellwig /* 10143dcf5451SChristoph Hellwig * Behaviour when detecting errors 10153dcf5451SChristoph Hellwig */ 10163dcf5451SChristoph Hellwig #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 10173dcf5451SChristoph Hellwig #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 10183dcf5451SChristoph Hellwig #define EXT4_ERRORS_PANIC 3 /* Panic */ 10193dcf5451SChristoph Hellwig #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 10203dcf5451SChristoph Hellwig 1021e6153918SDarrick J. Wong /* Metadata checksum algorithm codes */ 1022e6153918SDarrick J. Wong #define EXT4_CRC32C_CHKSUM 1 1023e6153918SDarrick J. Wong 10243dcf5451SChristoph Hellwig /* 10253dcf5451SChristoph Hellwig * Structure of the super block 10263dcf5451SChristoph Hellwig */ 10273dcf5451SChristoph Hellwig struct ext4_super_block { 10283dcf5451SChristoph Hellwig /*00*/ __le32 s_inodes_count; /* Inodes count */ 10293dcf5451SChristoph Hellwig __le32 s_blocks_count_lo; /* Blocks count */ 10303dcf5451SChristoph Hellwig __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 10313dcf5451SChristoph Hellwig __le32 s_free_blocks_count_lo; /* Free blocks count */ 10323dcf5451SChristoph Hellwig /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 10333dcf5451SChristoph Hellwig __le32 s_first_data_block; /* First Data Block */ 10343dcf5451SChristoph Hellwig __le32 s_log_block_size; /* Block size */ 1035281b5995STheodore Ts'o __le32 s_log_cluster_size; /* Allocation cluster size */ 10363dcf5451SChristoph Hellwig /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1037281b5995STheodore Ts'o __le32 s_clusters_per_group; /* # Clusters per group */ 10383dcf5451SChristoph Hellwig __le32 s_inodes_per_group; /* # Inodes per group */ 10393dcf5451SChristoph Hellwig __le32 s_mtime; /* Mount time */ 10403dcf5451SChristoph Hellwig /*30*/ __le32 s_wtime; /* Write time */ 10413dcf5451SChristoph Hellwig __le16 s_mnt_count; /* Mount count */ 10423dcf5451SChristoph Hellwig __le16 s_max_mnt_count; /* Maximal mount count */ 10433dcf5451SChristoph Hellwig __le16 s_magic; /* Magic signature */ 10443dcf5451SChristoph Hellwig __le16 s_state; /* File system state */ 10453dcf5451SChristoph Hellwig __le16 s_errors; /* Behaviour when detecting errors */ 10463dcf5451SChristoph Hellwig __le16 s_minor_rev_level; /* minor revision level */ 10473dcf5451SChristoph Hellwig /*40*/ __le32 s_lastcheck; /* time of last check */ 10483dcf5451SChristoph Hellwig __le32 s_checkinterval; /* max. time between checks */ 10493dcf5451SChristoph Hellwig __le32 s_creator_os; /* OS */ 10503dcf5451SChristoph Hellwig __le32 s_rev_level; /* Revision level */ 10513dcf5451SChristoph Hellwig /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 10523dcf5451SChristoph Hellwig __le16 s_def_resgid; /* Default gid for reserved blocks */ 10533dcf5451SChristoph Hellwig /* 10543dcf5451SChristoph Hellwig * These fields are for EXT4_DYNAMIC_REV superblocks only. 10553dcf5451SChristoph Hellwig * 10563dcf5451SChristoph Hellwig * Note: the difference between the compatible feature set and 10573dcf5451SChristoph Hellwig * the incompatible feature set is that if there is a bit set 10583dcf5451SChristoph Hellwig * in the incompatible feature set that the kernel doesn't 10593dcf5451SChristoph Hellwig * know about, it should refuse to mount the filesystem. 10603dcf5451SChristoph Hellwig * 10613dcf5451SChristoph Hellwig * e2fsck's requirements are more strict; if it doesn't know 10623dcf5451SChristoph Hellwig * about a feature in either the compatible or incompatible 10633dcf5451SChristoph Hellwig * feature set, it must abort and not try to meddle with 10643dcf5451SChristoph Hellwig * things it doesn't understand... 10653dcf5451SChristoph Hellwig */ 10663dcf5451SChristoph Hellwig __le32 s_first_ino; /* First non-reserved inode */ 10673dcf5451SChristoph Hellwig __le16 s_inode_size; /* size of inode structure */ 10683dcf5451SChristoph Hellwig __le16 s_block_group_nr; /* block group # of this superblock */ 10693dcf5451SChristoph Hellwig __le32 s_feature_compat; /* compatible feature set */ 10703dcf5451SChristoph Hellwig /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 10713dcf5451SChristoph Hellwig __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 10723dcf5451SChristoph Hellwig /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 10733dcf5451SChristoph Hellwig /*78*/ char s_volume_name[16]; /* volume name */ 10743dcf5451SChristoph Hellwig /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 10753dcf5451SChristoph Hellwig /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 10763dcf5451SChristoph Hellwig /* 10773dcf5451SChristoph Hellwig * Performance hints. Directory preallocation should only 10783dcf5451SChristoph Hellwig * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 10793dcf5451SChristoph Hellwig */ 10803dcf5451SChristoph Hellwig __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 10813dcf5451SChristoph Hellwig __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 10823dcf5451SChristoph Hellwig __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 10833dcf5451SChristoph Hellwig /* 10843dcf5451SChristoph Hellwig * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 10853dcf5451SChristoph Hellwig */ 10863dcf5451SChristoph Hellwig /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 10873dcf5451SChristoph Hellwig /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 10883dcf5451SChristoph Hellwig __le32 s_journal_dev; /* device number of journal file */ 10893dcf5451SChristoph Hellwig __le32 s_last_orphan; /* start of list of inodes to delete */ 10903dcf5451SChristoph Hellwig __le32 s_hash_seed[4]; /* HTREE hash seed */ 10913dcf5451SChristoph Hellwig __u8 s_def_hash_version; /* Default hash version to use */ 109289eeddf0STheodore Ts'o __u8 s_jnl_backup_type; 10933dcf5451SChristoph Hellwig __le16 s_desc_size; /* size of group descriptor */ 10943dcf5451SChristoph Hellwig /*100*/ __le32 s_default_mount_opts; 10953dcf5451SChristoph Hellwig __le32 s_first_meta_bg; /* First metablock block group */ 10963dcf5451SChristoph Hellwig __le32 s_mkfs_time; /* When the filesystem was created */ 10973dcf5451SChristoph Hellwig __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 10983dcf5451SChristoph Hellwig /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 10993dcf5451SChristoph Hellwig /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 11003dcf5451SChristoph Hellwig __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 11013dcf5451SChristoph Hellwig __le32 s_free_blocks_count_hi; /* Free blocks count */ 11023dcf5451SChristoph Hellwig __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 11033dcf5451SChristoph Hellwig __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 11043dcf5451SChristoph Hellwig __le32 s_flags; /* Miscellaneous flags */ 11053dcf5451SChristoph Hellwig __le16 s_raid_stride; /* RAID stride */ 1106c5e06d10SJohann Lombardi __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 11073dcf5451SChristoph Hellwig __le64 s_mmp_block; /* Block for multi-mount protection */ 11083dcf5451SChristoph Hellwig __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1109772cb7c8SJose R. Santos __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1110e6153918SDarrick J. Wong __u8 s_checksum_type; /* metadata checksum algorithm used */ 1111772cb7c8SJose R. Santos __le16 s_reserved_pad; 1112afc32f7eSTheodore Ts'o __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 11134a9cdec7STheodore Ts'o __le32 s_snapshot_inum; /* Inode number of active snapshot */ 11144a9cdec7STheodore Ts'o __le32 s_snapshot_id; /* sequential ID of active snapshot */ 11154a9cdec7STheodore Ts'o __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 11164a9cdec7STheodore Ts'o snapshot's future use */ 11174a9cdec7STheodore Ts'o __le32 s_snapshot_list; /* inode number of the head of the 11184a9cdec7STheodore Ts'o on-disk snapshot list */ 11191c13d5c0STheodore Ts'o #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 11201c13d5c0STheodore Ts'o __le32 s_error_count; /* number of fs errors */ 11211c13d5c0STheodore Ts'o __le32 s_first_error_time; /* first time an error happened */ 11221c13d5c0STheodore Ts'o __le32 s_first_error_ino; /* inode involved in first error */ 11231c13d5c0STheodore Ts'o __le64 s_first_error_block; /* block involved of first error */ 11241c13d5c0STheodore Ts'o __u8 s_first_error_func[32]; /* function where the error happened */ 11251c13d5c0STheodore Ts'o __le32 s_first_error_line; /* line number where error happened */ 11261c13d5c0STheodore Ts'o __le32 s_last_error_time; /* most recent time of an error */ 11271c13d5c0STheodore Ts'o __le32 s_last_error_ino; /* inode involved in last error */ 11281c13d5c0STheodore Ts'o __le32 s_last_error_line; /* line number where error happened */ 11291c13d5c0STheodore Ts'o __le64 s_last_error_block; /* block involved of last error */ 11301c13d5c0STheodore Ts'o __u8 s_last_error_func[32]; /* function where the error happened */ 11318b67f04aSTheodore Ts'o #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 11328b67f04aSTheodore Ts'o __u8 s_mount_opts[64]; 1133281b5995STheodore Ts'o __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1134281b5995STheodore Ts'o __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1135281b5995STheodore Ts'o __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1136e6153918SDarrick J. Wong __le32 s_reserved[108]; /* Padding to the end of the block */ 1137e6153918SDarrick J. Wong __le32 s_checksum; /* crc32c(superblock) */ 11383dcf5451SChristoph Hellwig }; 11393dcf5451SChristoph Hellwig 11401c13d5c0STheodore Ts'o #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 11411c13d5c0STheodore Ts'o 11423dcf5451SChristoph Hellwig #ifdef __KERNEL__ 1143bc0b0d6dSTheodore Ts'o 1144bc0b0d6dSTheodore Ts'o /* 11454ab2f15bSTheodore Ts'o * run-time mount flags 1146bc0b0d6dSTheodore Ts'o */ 1147bc0b0d6dSTheodore Ts'o #define EXT4_MF_MNTDIR_SAMPLED 0x0001 11484ab2f15bSTheodore Ts'o #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1149bc0b0d6dSTheodore Ts'o 1150ca0faba0STheodore Ts'o /* 1151ca0faba0STheodore Ts'o * fourth extended-fs super-block data in memory 1152ca0faba0STheodore Ts'o */ 1153ca0faba0STheodore Ts'o struct ext4_sb_info { 1154ca0faba0STheodore Ts'o unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1155ca0faba0STheodore Ts'o unsigned long s_inodes_per_block;/* Number of inodes per block */ 1156ca0faba0STheodore Ts'o unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1157281b5995STheodore Ts'o unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1158ca0faba0STheodore Ts'o unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1159ca0faba0STheodore Ts'o unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1160ca0faba0STheodore Ts'o unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1161ca0faba0STheodore Ts'o unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1162ca0faba0STheodore Ts'o ext4_group_t s_groups_count; /* Number of groups in the fs */ 1163fb0a387dSEric Sandeen ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1164ca0faba0STheodore Ts'o unsigned long s_overhead_last; /* Last calculated overhead */ 1165ca0faba0STheodore Ts'o unsigned long s_blocks_last; /* Last seen block count */ 1166281b5995STheodore Ts'o unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1167281b5995STheodore Ts'o unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1168ca0faba0STheodore Ts'o loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1169ca0faba0STheodore Ts'o struct buffer_head * s_sbh; /* Buffer containing the super block */ 1170ca0faba0STheodore Ts'o struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1171ca0faba0STheodore Ts'o struct buffer_head **s_group_desc; 11727f4520ccSTheodore Ts'o unsigned int s_mount_opt; 1173a2595b8aSTheodore Ts'o unsigned int s_mount_opt2; 1174bc0b0d6dSTheodore Ts'o unsigned int s_mount_flags; 11755a916be1STheodore Ts'o unsigned int s_def_mount_opt; 1176ca0faba0STheodore Ts'o ext4_fsblk_t s_sb_block; 1177ca0faba0STheodore Ts'o uid_t s_resuid; 1178ca0faba0STheodore Ts'o gid_t s_resgid; 1179ca0faba0STheodore Ts'o unsigned short s_mount_state; 1180ca0faba0STheodore Ts'o unsigned short s_pad; 1181ca0faba0STheodore Ts'o int s_addr_per_block_bits; 1182ca0faba0STheodore Ts'o int s_desc_per_block_bits; 1183ca0faba0STheodore Ts'o int s_inode_size; 1184ca0faba0STheodore Ts'o int s_first_ino; 1185ca0faba0STheodore Ts'o unsigned int s_inode_readahead_blks; 118611013911SAndreas Dilger unsigned int s_inode_goal; 1187ca0faba0STheodore Ts'o spinlock_t s_next_gen_lock; 1188ca0faba0STheodore Ts'o u32 s_next_generation; 1189ca0faba0STheodore Ts'o u32 s_hash_seed[4]; 1190ca0faba0STheodore Ts'o int s_def_hash_version; 1191ca0faba0STheodore Ts'o int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 119257042651STheodore Ts'o struct percpu_counter s_freeclusters_counter; 1193ca0faba0STheodore Ts'o struct percpu_counter s_freeinodes_counter; 1194ca0faba0STheodore Ts'o struct percpu_counter s_dirs_counter; 119557042651STheodore Ts'o struct percpu_counter s_dirtyclusters_counter; 1196ca0faba0STheodore Ts'o struct blockgroup_lock *s_blockgroup_lock; 1197ca0faba0STheodore Ts'o struct proc_dir_entry *s_proc; 1198ca0faba0STheodore Ts'o struct kobject s_kobj; 1199ca0faba0STheodore Ts'o struct completion s_kobj_unregister; 1200ca0faba0STheodore Ts'o 1201ca0faba0STheodore Ts'o /* Journaling */ 1202ca0faba0STheodore Ts'o struct journal_s *s_journal; 1203ca0faba0STheodore Ts'o struct list_head s_orphan; 1204ca0faba0STheodore Ts'o struct mutex s_orphan_lock; 12058f82f840SYongqiang Yang unsigned long s_resize_flags; /* Flags indicating if there 12068f82f840SYongqiang Yang is a resizer */ 1207ca0faba0STheodore Ts'o unsigned long s_commit_interval; 1208ca0faba0STheodore Ts'o u32 s_max_batch_time; 1209ca0faba0STheodore Ts'o u32 s_min_batch_time; 1210ca0faba0STheodore Ts'o struct block_device *journal_bdev; 1211ca0faba0STheodore Ts'o #ifdef CONFIG_QUOTA 1212ca0faba0STheodore Ts'o char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 1213ca0faba0STheodore Ts'o int s_jquota_fmt; /* Format of quota to use */ 1214ca0faba0STheodore Ts'o #endif 1215ca0faba0STheodore Ts'o unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 12166fd058f7STheodore Ts'o struct rb_root system_blks; 1217ca0faba0STheodore Ts'o 1218ca0faba0STheodore Ts'o #ifdef EXTENTS_STATS 1219ca0faba0STheodore Ts'o /* ext4 extents stats */ 1220ca0faba0STheodore Ts'o unsigned long s_ext_min; 1221ca0faba0STheodore Ts'o unsigned long s_ext_max; 1222ca0faba0STheodore Ts'o unsigned long s_depth_max; 1223ca0faba0STheodore Ts'o spinlock_t s_ext_stats_lock; 1224ca0faba0STheodore Ts'o unsigned long s_ext_blocks; 1225ca0faba0STheodore Ts'o unsigned long s_ext_extents; 1226ca0faba0STheodore Ts'o #endif 1227ca0faba0STheodore Ts'o 1228ca0faba0STheodore Ts'o /* for buddy allocator */ 1229ca0faba0STheodore Ts'o struct ext4_group_info ***s_group_info; 1230ca0faba0STheodore Ts'o struct inode *s_buddy_cache; 1231ca0faba0STheodore Ts'o spinlock_t s_md_lock; 1232ca0faba0STheodore Ts'o unsigned short *s_mb_offsets; 1233ca0faba0STheodore Ts'o unsigned int *s_mb_maxs; 1234ca0faba0STheodore Ts'o 1235ca0faba0STheodore Ts'o /* tunables */ 1236ca0faba0STheodore Ts'o unsigned long s_stripe; 1237ca0faba0STheodore Ts'o unsigned int s_mb_stream_request; 1238ca0faba0STheodore Ts'o unsigned int s_mb_max_to_scan; 1239ca0faba0STheodore Ts'o unsigned int s_mb_min_to_scan; 1240ca0faba0STheodore Ts'o unsigned int s_mb_stats; 1241ca0faba0STheodore Ts'o unsigned int s_mb_order2_reqs; 1242ca0faba0STheodore Ts'o unsigned int s_mb_group_prealloc; 124355138e0bSTheodore Ts'o unsigned int s_max_writeback_mb_bump; 1244ca0faba0STheodore Ts'o /* where last allocation was done - for stream allocation */ 1245ca0faba0STheodore Ts'o unsigned long s_mb_last_group; 1246ca0faba0STheodore Ts'o unsigned long s_mb_last_start; 1247ca0faba0STheodore Ts'o 1248ca0faba0STheodore Ts'o /* stats for buddy allocator */ 1249ca0faba0STheodore Ts'o atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1250ca0faba0STheodore Ts'o atomic_t s_bal_success; /* we found long enough chunks */ 1251ca0faba0STheodore Ts'o atomic_t s_bal_allocated; /* in blocks */ 1252ca0faba0STheodore Ts'o atomic_t s_bal_ex_scanned; /* total extents scanned */ 1253ca0faba0STheodore Ts'o atomic_t s_bal_goals; /* goal hits */ 1254ca0faba0STheodore Ts'o atomic_t s_bal_breaks; /* too long searches */ 1255ca0faba0STheodore Ts'o atomic_t s_bal_2orders; /* 2^order hits */ 1256ca0faba0STheodore Ts'o spinlock_t s_bal_lock; 1257ca0faba0STheodore Ts'o unsigned long s_mb_buddies_generated; 1258ca0faba0STheodore Ts'o unsigned long long s_mb_generation_time; 1259ca0faba0STheodore Ts'o atomic_t s_mb_lost_chunks; 1260ca0faba0STheodore Ts'o atomic_t s_mb_preallocated; 1261ca0faba0STheodore Ts'o atomic_t s_mb_discarded; 126250797481STheodore Ts'o atomic_t s_lock_busy; 1263ca0faba0STheodore Ts'o 1264ca0faba0STheodore Ts'o /* locality groups */ 1265003cb608STejun Heo struct ext4_locality_group __percpu *s_locality_groups; 1266ca0faba0STheodore Ts'o 1267ca0faba0STheodore Ts'o /* for write statistics */ 1268ca0faba0STheodore Ts'o unsigned long s_sectors_written_start; 1269ca0faba0STheodore Ts'o u64 s_kbytes_written; 1270ca0faba0STheodore Ts'o 1271ca0faba0STheodore Ts'o unsigned int s_log_groups_per_flex; 1272ca0faba0STheodore Ts'o struct flex_groups *s_flex_groups; 12734c0425ffSMingming Cao 12744c0425ffSMingming Cao /* workqueue for dio unwritten */ 12754c0425ffSMingming Cao struct workqueue_struct *dio_unwritten_wq; 127666e61a9eSTheodore Ts'o 127766e61a9eSTheodore Ts'o /* timer for periodic error stats printing */ 127866e61a9eSTheodore Ts'o struct timer_list s_err_report; 1279bfff6873SLukas Czerner 1280bfff6873SLukas Czerner /* Lazy inode table initialization info */ 1281bfff6873SLukas Czerner struct ext4_li_request *s_li_request; 1282bfff6873SLukas Czerner /* Wait multiplier for lazy initialization thread */ 1283bfff6873SLukas Czerner unsigned int s_li_wait_mult; 1284c5e06d10SJohann Lombardi 1285c5e06d10SJohann Lombardi /* Kernel thread for multiple mount protection */ 1286c5e06d10SJohann Lombardi struct task_struct *s_mmp_tsk; 12873d56b8d2STao Ma 12883d56b8d2STao Ma /* record the last minlen when FITRIM is called. */ 12893d56b8d2STao Ma atomic_t s_last_trim_minblks; 12900441984aSDarrick J. Wong 12910441984aSDarrick J. Wong /* Reference to checksum algorithm driver via cryptoapi */ 12920441984aSDarrick J. Wong struct crypto_shash *s_chksum_driver; 1293a9c47317SDarrick J. Wong 1294a9c47317SDarrick J. Wong /* Precomputed FS UUID checksum for seeding other checksums */ 1295a9c47317SDarrick J. Wong __u32 s_csum_seed; 1296ca0faba0STheodore Ts'o }; 1297ca0faba0STheodore Ts'o 12983dcf5451SChristoph Hellwig static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 12993dcf5451SChristoph Hellwig { 13003dcf5451SChristoph Hellwig return sb->s_fs_info; 13013dcf5451SChristoph Hellwig } 13023dcf5451SChristoph Hellwig static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 13033dcf5451SChristoph Hellwig { 13043dcf5451SChristoph Hellwig return container_of(inode, struct ext4_inode_info, vfs_inode); 13053dcf5451SChristoph Hellwig } 13063dcf5451SChristoph Hellwig 13073dcf5451SChristoph Hellwig static inline struct timespec ext4_current_time(struct inode *inode) 13083dcf5451SChristoph Hellwig { 13093dcf5451SChristoph Hellwig return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 13103dcf5451SChristoph Hellwig current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 13113dcf5451SChristoph Hellwig } 13123dcf5451SChristoph Hellwig 13133dcf5451SChristoph Hellwig static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 13143dcf5451SChristoph Hellwig { 13153dcf5451SChristoph Hellwig return ino == EXT4_ROOT_INO || 13163dcf5451SChristoph Hellwig ino == EXT4_JOURNAL_INO || 13173dcf5451SChristoph Hellwig ino == EXT4_RESIZE_INO || 13183dcf5451SChristoph Hellwig (ino >= EXT4_FIRST_INO(sb) && 13193dcf5451SChristoph Hellwig ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 13203dcf5451SChristoph Hellwig } 132119f5fb7aSTheodore Ts'o 13220edeb71dSTao Ma static inline void ext4_set_io_unwritten_flag(struct inode *inode, 13230edeb71dSTao Ma struct ext4_io_end *io_end) 13240edeb71dSTao Ma { 13250edeb71dSTao Ma if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 13260edeb71dSTao Ma io_end->flag |= EXT4_IO_END_UNWRITTEN; 13270edeb71dSTao Ma atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten); 13280edeb71dSTao Ma } 13290edeb71dSTao Ma } 13300edeb71dSTao Ma 133119f5fb7aSTheodore Ts'o /* 133219f5fb7aSTheodore Ts'o * Inode dynamic state flags 133319f5fb7aSTheodore Ts'o */ 133419f5fb7aSTheodore Ts'o enum { 133519f5fb7aSTheodore Ts'o EXT4_STATE_JDATA, /* journaled data exists */ 133619f5fb7aSTheodore Ts'o EXT4_STATE_NEW, /* inode is newly created */ 133719f5fb7aSTheodore Ts'o EXT4_STATE_XATTR, /* has in-inode xattrs */ 133819f5fb7aSTheodore Ts'o EXT4_STATE_NO_EXPAND, /* No space for expansion */ 133919f5fb7aSTheodore Ts'o EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 134019f5fb7aSTheodore Ts'o EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 134119f5fb7aSTheodore Ts'o EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 134214ece102SFrank Mayhar EXT4_STATE_NEWENTRY, /* File just added to dir */ 1343f2321097STheodore Ts'o EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */ 134419f5fb7aSTheodore Ts'o }; 134519f5fb7aSTheodore Ts'o 1346353eb83cSTheodore Ts'o #define EXT4_INODE_BIT_FNS(name, field, offset) \ 134712e9b892SDmitry Monakhov static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 134812e9b892SDmitry Monakhov { \ 1349353eb83cSTheodore Ts'o return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 135012e9b892SDmitry Monakhov } \ 135112e9b892SDmitry Monakhov static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 135212e9b892SDmitry Monakhov { \ 1353353eb83cSTheodore Ts'o set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 135412e9b892SDmitry Monakhov } \ 135512e9b892SDmitry Monakhov static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 135612e9b892SDmitry Monakhov { \ 1357353eb83cSTheodore Ts'o clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 135819f5fb7aSTheodore Ts'o } 135919f5fb7aSTheodore Ts'o 1360353eb83cSTheodore Ts'o EXT4_INODE_BIT_FNS(flag, flags, 0) 1361353eb83cSTheodore Ts'o #if (BITS_PER_LONG < 64) 1362353eb83cSTheodore Ts'o EXT4_INODE_BIT_FNS(state, state_flags, 0) 1363353eb83cSTheodore Ts'o 1364353eb83cSTheodore Ts'o static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1365353eb83cSTheodore Ts'o { 1366353eb83cSTheodore Ts'o (ei)->i_state_flags = 0; 1367353eb83cSTheodore Ts'o } 1368353eb83cSTheodore Ts'o #else 1369353eb83cSTheodore Ts'o EXT4_INODE_BIT_FNS(state, flags, 32) 1370353eb83cSTheodore Ts'o 1371353eb83cSTheodore Ts'o static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1372353eb83cSTheodore Ts'o { 1373353eb83cSTheodore Ts'o /* We depend on the fact that callers will set i_flags */ 1374353eb83cSTheodore Ts'o } 1375353eb83cSTheodore Ts'o #endif 13763dcf5451SChristoph Hellwig #else 13773dcf5451SChristoph Hellwig /* Assume that user mode programs are passing in an ext4fs superblock, not 13783dcf5451SChristoph Hellwig * a kernel struct super_block. This will allow us to call the feature-test 13793dcf5451SChristoph Hellwig * macros from user land. */ 13803dcf5451SChristoph Hellwig #define EXT4_SB(sb) (sb) 13813dcf5451SChristoph Hellwig #endif 13823dcf5451SChristoph Hellwig 13833dcf5451SChristoph Hellwig #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 13843dcf5451SChristoph Hellwig 13853dcf5451SChristoph Hellwig /* 13863dcf5451SChristoph Hellwig * Codes for operating systems 13873dcf5451SChristoph Hellwig */ 13883dcf5451SChristoph Hellwig #define EXT4_OS_LINUX 0 13893dcf5451SChristoph Hellwig #define EXT4_OS_HURD 1 13903dcf5451SChristoph Hellwig #define EXT4_OS_MASIX 2 13913dcf5451SChristoph Hellwig #define EXT4_OS_FREEBSD 3 13923dcf5451SChristoph Hellwig #define EXT4_OS_LITES 4 13933dcf5451SChristoph Hellwig 13943dcf5451SChristoph Hellwig /* 13953dcf5451SChristoph Hellwig * Revision levels 13963dcf5451SChristoph Hellwig */ 13973dcf5451SChristoph Hellwig #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 13983dcf5451SChristoph Hellwig #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 13993dcf5451SChristoph Hellwig 14003dcf5451SChristoph Hellwig #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 14013dcf5451SChristoph Hellwig #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 14023dcf5451SChristoph Hellwig 14033dcf5451SChristoph Hellwig #define EXT4_GOOD_OLD_INODE_SIZE 128 14043dcf5451SChristoph Hellwig 14053dcf5451SChristoph Hellwig /* 14063dcf5451SChristoph Hellwig * Feature set definitions 14073dcf5451SChristoph Hellwig */ 14083dcf5451SChristoph Hellwig 14093dcf5451SChristoph Hellwig #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 14103a06d778SAneesh Kumar K.V ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 14113dcf5451SChristoph Hellwig #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 14123a06d778SAneesh Kumar K.V ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 14133dcf5451SChristoph Hellwig #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 14143a06d778SAneesh Kumar K.V ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 14153dcf5451SChristoph Hellwig #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 14163dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 14173dcf5451SChristoph Hellwig #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 14183dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 14193dcf5451SChristoph Hellwig #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 14203dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 14213dcf5451SChristoph Hellwig #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 14223dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 14233dcf5451SChristoph Hellwig #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 14243dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 14253dcf5451SChristoph Hellwig #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 14263dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 14273dcf5451SChristoph Hellwig 14283dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 14293dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 14303dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 14313dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 14323dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 14333dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 14343dcf5451SChristoph Hellwig 14353dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 14363dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 14373dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 14383dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 14393dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 14403dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 14413dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1442ae812306SAditya Kali #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1443281b5995STheodore Ts'o #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1444e6153918SDarrick J. Wong /* 1445e6153918SDarrick J. Wong * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1446e6153918SDarrick J. Wong * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1447e6153918SDarrick J. Wong * all other data structures' checksums. However, the METADATA_CSUM and 1448e6153918SDarrick J. Wong * GDT_CSUM bits are mutually exclusive. 1449e6153918SDarrick J. Wong */ 14509b90e5e0STheodore Ts'o #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 14513dcf5451SChristoph Hellwig 14523dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 14533dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 14543dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 14553dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 14563dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 14573dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 14583dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 14593dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 14603dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1461f710b4b9STheodore Ts'o #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1462f710b4b9STheodore Ts'o #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1463856cbcf9STheodore Ts'o #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ 14649b90e5e0STheodore Ts'o #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1465856cbcf9STheodore Ts'o #define EXT4_FEATURE_INCOMPAT_INLINEDATA 0x8000 /* data in inode */ 14663dcf5451SChristoph Hellwig 14672035e776STheodore Ts'o #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 14682035e776STheodore Ts'o #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 14692035e776STheodore Ts'o EXT4_FEATURE_INCOMPAT_META_BG) 14702035e776STheodore Ts'o #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 14712035e776STheodore Ts'o EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 14722035e776STheodore Ts'o EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 14732035e776STheodore Ts'o 14742035e776STheodore Ts'o #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 14752035e776STheodore Ts'o #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 14762035e776STheodore Ts'o EXT4_FEATURE_INCOMPAT_RECOVER| \ 14772035e776STheodore Ts'o EXT4_FEATURE_INCOMPAT_META_BG) 14782035e776STheodore Ts'o #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 14792035e776STheodore Ts'o EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 14802035e776STheodore Ts'o EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 14812035e776STheodore Ts'o 14823dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 14833dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 14843dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_RECOVER| \ 14853dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_META_BG| \ 14863dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_EXTENTS| \ 14873dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_64BIT| \ 1488c5e06d10SJohann Lombardi EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1489c5e06d10SJohann Lombardi EXT4_FEATURE_INCOMPAT_MMP) 14903dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 14913dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 14923dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 14933dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 14943dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 14953dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 14966f16b606STheodore Ts'o EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 14976f16b606STheodore Ts'o EXT4_FEATURE_RO_COMPAT_BIGALLOC) 14983dcf5451SChristoph Hellwig 14993dcf5451SChristoph Hellwig /* 15003dcf5451SChristoph Hellwig * Default values for user and/or group using reserved blocks 15013dcf5451SChristoph Hellwig */ 15023dcf5451SChristoph Hellwig #define EXT4_DEF_RESUID 0 15033dcf5451SChristoph Hellwig #define EXT4_DEF_RESGID 0 15043dcf5451SChristoph Hellwig 1505240799cdSTheodore Ts'o #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1506240799cdSTheodore Ts'o 15073dcf5451SChristoph Hellwig /* 15083dcf5451SChristoph Hellwig * Default mount options 15093dcf5451SChristoph Hellwig */ 15103dcf5451SChristoph Hellwig #define EXT4_DEFM_DEBUG 0x0001 15113dcf5451SChristoph Hellwig #define EXT4_DEFM_BSDGROUPS 0x0002 15123dcf5451SChristoph Hellwig #define EXT4_DEFM_XATTR_USER 0x0004 15133dcf5451SChristoph Hellwig #define EXT4_DEFM_ACL 0x0008 15143dcf5451SChristoph Hellwig #define EXT4_DEFM_UID16 0x0010 15153dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE 0x0060 15163dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE_DATA 0x0020 15173dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE_ORDERED 0x0040 15183dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE_WBACK 0x0060 15198b67f04aSTheodore Ts'o #define EXT4_DEFM_NOBARRIER 0x0100 15208b67f04aSTheodore Ts'o #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 15218b67f04aSTheodore Ts'o #define EXT4_DEFM_DISCARD 0x0400 15228b67f04aSTheodore Ts'o #define EXT4_DEFM_NODELALLOC 0x0800 15233dcf5451SChristoph Hellwig 15243dcf5451SChristoph Hellwig /* 152530773840STheodore Ts'o * Default journal batch times 152630773840STheodore Ts'o */ 152730773840STheodore Ts'o #define EXT4_DEF_MIN_BATCH_TIME 0 152830773840STheodore Ts'o #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 152930773840STheodore Ts'o 153030773840STheodore Ts'o /* 1531a4912123STheodore Ts'o * Minimum number of groups in a flexgroup before we separate out 1532a4912123STheodore Ts'o * directories into the first block group of a flexgroup 1533a4912123STheodore Ts'o */ 1534a4912123STheodore Ts'o #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1535a4912123STheodore Ts'o 1536a4912123STheodore Ts'o /* 15373dcf5451SChristoph Hellwig * Structure of a directory entry 15383dcf5451SChristoph Hellwig */ 15393dcf5451SChristoph Hellwig #define EXT4_NAME_LEN 255 15403dcf5451SChristoph Hellwig 15413dcf5451SChristoph Hellwig struct ext4_dir_entry { 15423dcf5451SChristoph Hellwig __le32 inode; /* Inode number */ 15433dcf5451SChristoph Hellwig __le16 rec_len; /* Directory entry length */ 15443dcf5451SChristoph Hellwig __le16 name_len; /* Name length */ 15453dcf5451SChristoph Hellwig char name[EXT4_NAME_LEN]; /* File name */ 15463dcf5451SChristoph Hellwig }; 15473dcf5451SChristoph Hellwig 15483dcf5451SChristoph Hellwig /* 15493dcf5451SChristoph Hellwig * The new version of the directory entry. Since EXT4 structures are 15503dcf5451SChristoph Hellwig * stored in intel byte order, and the name_len field could never be 15513dcf5451SChristoph Hellwig * bigger than 255 chars, it's safe to reclaim the extra byte for the 15523dcf5451SChristoph Hellwig * file_type field. 15533dcf5451SChristoph Hellwig */ 15543dcf5451SChristoph Hellwig struct ext4_dir_entry_2 { 15553dcf5451SChristoph Hellwig __le32 inode; /* Inode number */ 15563dcf5451SChristoph Hellwig __le16 rec_len; /* Directory entry length */ 15573dcf5451SChristoph Hellwig __u8 name_len; /* Name length */ 15583dcf5451SChristoph Hellwig __u8 file_type; 15593dcf5451SChristoph Hellwig char name[EXT4_NAME_LEN]; /* File name */ 15603dcf5451SChristoph Hellwig }; 15613dcf5451SChristoph Hellwig 15623dcf5451SChristoph Hellwig /* 1563e6153918SDarrick J. Wong * This is a bogus directory entry at the end of each leaf block that 1564e6153918SDarrick J. Wong * records checksums. 1565e6153918SDarrick J. Wong */ 1566e6153918SDarrick J. Wong struct ext4_dir_entry_tail { 1567e6153918SDarrick J. Wong __le32 det_reserved_zero1; /* Pretend to be unused */ 1568e6153918SDarrick J. Wong __le16 det_rec_len; /* 12 */ 1569e6153918SDarrick J. Wong __u8 det_reserved_zero2; /* Zero name length */ 1570e6153918SDarrick J. Wong __u8 det_reserved_ft; /* 0xDE, fake file type */ 1571e6153918SDarrick J. Wong __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1572e6153918SDarrick J. Wong }; 1573e6153918SDarrick J. Wong 1574e6153918SDarrick J. Wong /* 15753dcf5451SChristoph Hellwig * Ext4 directory file types. Only the low 3 bits are used. The 15763dcf5451SChristoph Hellwig * other bits are reserved for now. 15773dcf5451SChristoph Hellwig */ 15783dcf5451SChristoph Hellwig #define EXT4_FT_UNKNOWN 0 15793dcf5451SChristoph Hellwig #define EXT4_FT_REG_FILE 1 15803dcf5451SChristoph Hellwig #define EXT4_FT_DIR 2 15813dcf5451SChristoph Hellwig #define EXT4_FT_CHRDEV 3 15823dcf5451SChristoph Hellwig #define EXT4_FT_BLKDEV 4 15833dcf5451SChristoph Hellwig #define EXT4_FT_FIFO 5 15843dcf5451SChristoph Hellwig #define EXT4_FT_SOCK 6 15853dcf5451SChristoph Hellwig #define EXT4_FT_SYMLINK 7 15863dcf5451SChristoph Hellwig 15873dcf5451SChristoph Hellwig #define EXT4_FT_MAX 8 15883dcf5451SChristoph Hellwig 1589e6153918SDarrick J. Wong #define EXT4_FT_DIR_CSUM 0xDE 1590e6153918SDarrick J. Wong 15913dcf5451SChristoph Hellwig /* 15923dcf5451SChristoph Hellwig * EXT4_DIR_PAD defines the directory entries boundaries 15933dcf5451SChristoph Hellwig * 15943dcf5451SChristoph Hellwig * NOTE: It must be a multiple of 4 15953dcf5451SChristoph Hellwig */ 15963dcf5451SChristoph Hellwig #define EXT4_DIR_PAD 4 15973dcf5451SChristoph Hellwig #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 15983dcf5451SChristoph Hellwig #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 15993dcf5451SChristoph Hellwig ~EXT4_DIR_ROUND) 16003dcf5451SChristoph Hellwig #define EXT4_MAX_REC_LEN ((1<<16)-1) 16013dcf5451SChristoph Hellwig 16023dcf5451SChristoph Hellwig /* 16030cfc9255SEric Sandeen * If we ever get support for fs block sizes > page_size, we'll need 16040cfc9255SEric Sandeen * to remove the #if statements in the next two functions... 16050cfc9255SEric Sandeen */ 16060cfc9255SEric Sandeen static inline unsigned int 16070cfc9255SEric Sandeen ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 16080cfc9255SEric Sandeen { 16090cfc9255SEric Sandeen unsigned len = le16_to_cpu(dlen); 16100cfc9255SEric Sandeen 16110cfc9255SEric Sandeen #if (PAGE_CACHE_SIZE >= 65536) 16120cfc9255SEric Sandeen if (len == EXT4_MAX_REC_LEN || len == 0) 16130cfc9255SEric Sandeen return blocksize; 16140cfc9255SEric Sandeen return (len & 65532) | ((len & 3) << 16); 16150cfc9255SEric Sandeen #else 16160cfc9255SEric Sandeen return len; 16170cfc9255SEric Sandeen #endif 16180cfc9255SEric Sandeen } 16190cfc9255SEric Sandeen 16200cfc9255SEric Sandeen static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 16210cfc9255SEric Sandeen { 16220cfc9255SEric Sandeen if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 16230cfc9255SEric Sandeen BUG(); 16240cfc9255SEric Sandeen #if (PAGE_CACHE_SIZE >= 65536) 16250cfc9255SEric Sandeen if (len < 65536) 16260cfc9255SEric Sandeen return cpu_to_le16(len); 16270cfc9255SEric Sandeen if (len == blocksize) { 16280cfc9255SEric Sandeen if (blocksize == 65536) 16290cfc9255SEric Sandeen return cpu_to_le16(EXT4_MAX_REC_LEN); 16300cfc9255SEric Sandeen else 16310cfc9255SEric Sandeen return cpu_to_le16(0); 16320cfc9255SEric Sandeen } 16330cfc9255SEric Sandeen return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 16340cfc9255SEric Sandeen #else 16350cfc9255SEric Sandeen return cpu_to_le16(len); 16360cfc9255SEric Sandeen #endif 16370cfc9255SEric Sandeen } 16380cfc9255SEric Sandeen 16390cfc9255SEric Sandeen /* 16403dcf5451SChristoph Hellwig * Hash Tree Directory indexing 16413dcf5451SChristoph Hellwig * (c) Daniel Phillips, 2001 16423dcf5451SChristoph Hellwig */ 16433dcf5451SChristoph Hellwig 16443dcf5451SChristoph Hellwig #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 16453dcf5451SChristoph Hellwig EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 164612e9b892SDmitry Monakhov ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 16473dcf5451SChristoph Hellwig #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 16483dcf5451SChristoph Hellwig #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 16493dcf5451SChristoph Hellwig 16503dcf5451SChristoph Hellwig /* Legal values for the dx_root hash_version field: */ 16513dcf5451SChristoph Hellwig 16523dcf5451SChristoph Hellwig #define DX_HASH_LEGACY 0 16533dcf5451SChristoph Hellwig #define DX_HASH_HALF_MD4 1 16543dcf5451SChristoph Hellwig #define DX_HASH_TEA 2 1655f99b2589STheodore Ts'o #define DX_HASH_LEGACY_UNSIGNED 3 1656f99b2589STheodore Ts'o #define DX_HASH_HALF_MD4_UNSIGNED 4 1657f99b2589STheodore Ts'o #define DX_HASH_TEA_UNSIGNED 5 16583dcf5451SChristoph Hellwig 16590441984aSDarrick J. Wong static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 16600441984aSDarrick J. Wong const void *address, unsigned int length) 16610441984aSDarrick J. Wong { 16620441984aSDarrick J. Wong struct { 16630441984aSDarrick J. Wong struct shash_desc shash; 16640441984aSDarrick J. Wong char ctx[crypto_shash_descsize(sbi->s_chksum_driver)]; 16650441984aSDarrick J. Wong } desc; 16660441984aSDarrick J. Wong int err; 16670441984aSDarrick J. Wong 16680441984aSDarrick J. Wong desc.shash.tfm = sbi->s_chksum_driver; 16690441984aSDarrick J. Wong desc.shash.flags = 0; 16700441984aSDarrick J. Wong *(u32 *)desc.ctx = crc; 16710441984aSDarrick J. Wong 16720441984aSDarrick J. Wong err = crypto_shash_update(&desc.shash, address, length); 16730441984aSDarrick J. Wong BUG_ON(err); 16740441984aSDarrick J. Wong 16750441984aSDarrick J. Wong return *(u32 *)desc.ctx; 16760441984aSDarrick J. Wong } 16770441984aSDarrick J. Wong 16783dcf5451SChristoph Hellwig #ifdef __KERNEL__ 16793dcf5451SChristoph Hellwig 16803dcf5451SChristoph Hellwig /* hash info structure used by the directory hash */ 16813dcf5451SChristoph Hellwig struct dx_hash_info 16823dcf5451SChristoph Hellwig { 16833dcf5451SChristoph Hellwig u32 hash; 16843dcf5451SChristoph Hellwig u32 minor_hash; 16853dcf5451SChristoph Hellwig int hash_version; 16863dcf5451SChristoph Hellwig u32 *seed; 16873dcf5451SChristoph Hellwig }; 16883dcf5451SChristoph Hellwig 1689d1f5273eSFan Yong 1690d1f5273eSFan Yong /* 32 and 64 bit signed EOF for dx directories */ 1691d1f5273eSFan Yong #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1692d1f5273eSFan Yong #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1693d1f5273eSFan Yong 16943dcf5451SChristoph Hellwig 16953dcf5451SChristoph Hellwig /* 16963dcf5451SChristoph Hellwig * Control parameters used by ext4_htree_next_block 16973dcf5451SChristoph Hellwig */ 16983dcf5451SChristoph Hellwig #define HASH_NB_ALWAYS 1 16993dcf5451SChristoph Hellwig 17003dcf5451SChristoph Hellwig 17013dcf5451SChristoph Hellwig /* 17023dcf5451SChristoph Hellwig * Describe an inode's exact location on disk and in memory 17033dcf5451SChristoph Hellwig */ 17043dcf5451SChristoph Hellwig struct ext4_iloc 17053dcf5451SChristoph Hellwig { 17063dcf5451SChristoph Hellwig struct buffer_head *bh; 17073dcf5451SChristoph Hellwig unsigned long offset; 17083dcf5451SChristoph Hellwig ext4_group_t block_group; 17093dcf5451SChristoph Hellwig }; 17103dcf5451SChristoph Hellwig 17113dcf5451SChristoph Hellwig static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 17123dcf5451SChristoph Hellwig { 17133dcf5451SChristoph Hellwig return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 17143dcf5451SChristoph Hellwig } 17153dcf5451SChristoph Hellwig 17163dcf5451SChristoph Hellwig /* 17173dcf5451SChristoph Hellwig * This structure is stuffed into the struct file's private_data field 17183dcf5451SChristoph Hellwig * for directories. It is where we put information so that we can do 17193dcf5451SChristoph Hellwig * readdir operations in hash tree order. 17203dcf5451SChristoph Hellwig */ 17213dcf5451SChristoph Hellwig struct dir_private_info { 17223dcf5451SChristoph Hellwig struct rb_root root; 17233dcf5451SChristoph Hellwig struct rb_node *curr_node; 17243dcf5451SChristoph Hellwig struct fname *extra_fname; 17253dcf5451SChristoph Hellwig loff_t last_pos; 17263dcf5451SChristoph Hellwig __u32 curr_hash; 17273dcf5451SChristoph Hellwig __u32 curr_minor_hash; 17283dcf5451SChristoph Hellwig __u32 next_hash; 17293dcf5451SChristoph Hellwig }; 17303dcf5451SChristoph Hellwig 17313dcf5451SChristoph Hellwig /* calculate the first block number of the group */ 17323dcf5451SChristoph Hellwig static inline ext4_fsblk_t 17333dcf5451SChristoph Hellwig ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 17343dcf5451SChristoph Hellwig { 17353dcf5451SChristoph Hellwig return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 17363dcf5451SChristoph Hellwig le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 17373dcf5451SChristoph Hellwig } 17383dcf5451SChristoph Hellwig 17393dcf5451SChristoph Hellwig /* 17403dcf5451SChristoph Hellwig * Special error return code only used by dx_probe() and its callers. 17413dcf5451SChristoph Hellwig */ 17423dcf5451SChristoph Hellwig #define ERR_BAD_DX_DIR -75000 17433dcf5451SChristoph Hellwig 17443dcf5451SChristoph Hellwig void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1745a9df9a49STheodore Ts'o ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 17463dcf5451SChristoph Hellwig 17473dcf5451SChristoph Hellwig /* 1748bfff6873SLukas Czerner * Timeout and state flag for lazy initialization inode thread. 1749bfff6873SLukas Czerner */ 1750bfff6873SLukas Czerner #define EXT4_DEF_LI_WAIT_MULT 10 1751bfff6873SLukas Czerner #define EXT4_DEF_LI_MAX_START_DELAY 5 1752bfff6873SLukas Czerner #define EXT4_LAZYINIT_QUIT 0x0001 1753bfff6873SLukas Czerner #define EXT4_LAZYINIT_RUNNING 0x0002 1754bfff6873SLukas Czerner 1755bfff6873SLukas Czerner /* 1756bfff6873SLukas Czerner * Lazy inode table initialization info 1757bfff6873SLukas Czerner */ 1758bfff6873SLukas Czerner struct ext4_lazy_init { 1759bfff6873SLukas Czerner unsigned long li_state; 1760bfff6873SLukas Czerner struct list_head li_request_list; 1761bfff6873SLukas Czerner struct mutex li_list_mtx; 1762bfff6873SLukas Czerner }; 1763bfff6873SLukas Czerner 1764bfff6873SLukas Czerner struct ext4_li_request { 1765bfff6873SLukas Czerner struct super_block *lr_super; 1766bfff6873SLukas Czerner struct ext4_sb_info *lr_sbi; 1767bfff6873SLukas Czerner ext4_group_t lr_next_group; 1768bfff6873SLukas Czerner struct list_head lr_request; 1769bfff6873SLukas Czerner unsigned long lr_next_sched; 1770bfff6873SLukas Czerner unsigned long lr_timeout; 1771bfff6873SLukas Czerner }; 1772bfff6873SLukas Czerner 1773857ac889SLukas Czerner struct ext4_features { 1774857ac889SLukas Czerner struct kobject f_kobj; 1775857ac889SLukas Czerner struct completion f_kobj_unregister; 1776857ac889SLukas Czerner }; 1777857ac889SLukas Czerner 1778bfff6873SLukas Czerner /* 1779c5e06d10SJohann Lombardi * This structure will be used for multiple mount protection. It will be 1780c5e06d10SJohann Lombardi * written into the block number saved in the s_mmp_block field in the 1781c5e06d10SJohann Lombardi * superblock. Programs that check MMP should assume that if 1782c5e06d10SJohann Lombardi * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1783c5e06d10SJohann Lombardi * to use the filesystem, regardless of how old the timestamp is. 1784c5e06d10SJohann Lombardi */ 1785c5e06d10SJohann Lombardi #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1786c5e06d10SJohann Lombardi #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1787c5e06d10SJohann Lombardi #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1788c5e06d10SJohann Lombardi #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1789c5e06d10SJohann Lombardi 1790c5e06d10SJohann Lombardi struct mmp_struct { 1791c5e06d10SJohann Lombardi __le32 mmp_magic; /* Magic number for MMP */ 1792c5e06d10SJohann Lombardi __le32 mmp_seq; /* Sequence no. updated periodically */ 1793c5e06d10SJohann Lombardi 1794c5e06d10SJohann Lombardi /* 1795c5e06d10SJohann Lombardi * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1796c5e06d10SJohann Lombardi * purposes and do not affect the correctness of the algorithm 1797c5e06d10SJohann Lombardi */ 1798c5e06d10SJohann Lombardi __le64 mmp_time; /* Time last updated */ 1799c5e06d10SJohann Lombardi char mmp_nodename[64]; /* Node which last updated MMP block */ 1800c5e06d10SJohann Lombardi char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1801c5e06d10SJohann Lombardi 1802c5e06d10SJohann Lombardi /* 1803c5e06d10SJohann Lombardi * mmp_check_interval is used to verify if the MMP block has been 1804c5e06d10SJohann Lombardi * updated on the block device. The value is updated based on the 1805c5e06d10SJohann Lombardi * maximum time to write the MMP block during an update cycle. 1806c5e06d10SJohann Lombardi */ 1807c5e06d10SJohann Lombardi __le16 mmp_check_interval; 1808c5e06d10SJohann Lombardi 1809c5e06d10SJohann Lombardi __le16 mmp_pad1; 1810e6153918SDarrick J. Wong __le32 mmp_pad2[226]; 1811e6153918SDarrick J. Wong __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1812c5e06d10SJohann Lombardi }; 1813c5e06d10SJohann Lombardi 1814c5e06d10SJohann Lombardi /* arguments passed to the mmp thread */ 1815c5e06d10SJohann Lombardi struct mmpd_data { 1816c5e06d10SJohann Lombardi struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1817c5e06d10SJohann Lombardi struct super_block *sb; /* super block of the fs */ 1818c5e06d10SJohann Lombardi }; 1819c5e06d10SJohann Lombardi 1820c5e06d10SJohann Lombardi /* 1821c5e06d10SJohann Lombardi * Check interval multiplier 1822c5e06d10SJohann Lombardi * The MMP block is written every update interval and initially checked every 1823c5e06d10SJohann Lombardi * update interval x the multiplier (the value is then adapted based on the 1824c5e06d10SJohann Lombardi * write latency). The reason is that writes can be delayed under load and we 1825c5e06d10SJohann Lombardi * don't want readers to incorrectly assume that the filesystem is no longer 1826c5e06d10SJohann Lombardi * in use. 1827c5e06d10SJohann Lombardi */ 1828c5e06d10SJohann Lombardi #define EXT4_MMP_CHECK_MULT 2UL 1829c5e06d10SJohann Lombardi 1830c5e06d10SJohann Lombardi /* 1831c5e06d10SJohann Lombardi * Minimum interval for MMP checking in seconds. 1832c5e06d10SJohann Lombardi */ 1833c5e06d10SJohann Lombardi #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1834c5e06d10SJohann Lombardi 1835c5e06d10SJohann Lombardi /* 1836c5e06d10SJohann Lombardi * Maximum interval for MMP checking in seconds. 1837c5e06d10SJohann Lombardi */ 1838c5e06d10SJohann Lombardi #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1839c5e06d10SJohann Lombardi 1840c5e06d10SJohann Lombardi /* 18413dcf5451SChristoph Hellwig * Function prototypes 18423dcf5451SChristoph Hellwig */ 18433dcf5451SChristoph Hellwig 18443dcf5451SChristoph Hellwig /* 18453dcf5451SChristoph Hellwig * Ok, these declarations are also in <linux/kernel.h> but none of the 18463dcf5451SChristoph Hellwig * ext4 source programs needs to include it so they are duplicated here. 18473dcf5451SChristoph Hellwig */ 18483dcf5451SChristoph Hellwig # define NORET_TYPE /**/ 18493dcf5451SChristoph Hellwig # define ATTRIB_NORET __attribute__((noreturn)) 18503dcf5451SChristoph Hellwig # define NORET_AND noreturn, 18513dcf5451SChristoph Hellwig 1852498e5f24STheodore Ts'o /* bitmap.c */ 1853498e5f24STheodore Ts'o extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 185441a246d1SDarrick J. Wong void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 185541a246d1SDarrick J. Wong struct ext4_group_desc *gdp, 185641a246d1SDarrick J. Wong struct buffer_head *bh, int sz); 185741a246d1SDarrick J. Wong int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 185841a246d1SDarrick J. Wong struct ext4_group_desc *gdp, 185941a246d1SDarrick J. Wong struct buffer_head *bh, int sz); 1860fa77dcfaSDarrick J. Wong void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1861fa77dcfaSDarrick J. Wong struct ext4_group_desc *gdp, 1862fa77dcfaSDarrick J. Wong struct buffer_head *bh, int sz); 1863fa77dcfaSDarrick J. Wong int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1864fa77dcfaSDarrick J. Wong struct ext4_group_desc *gdp, 1865fa77dcfaSDarrick J. Wong struct buffer_head *bh, int sz); 1866498e5f24STheodore Ts'o 18673dcf5451SChristoph Hellwig /* balloc.c */ 1868fa77dcfaSDarrick J. Wong extern void ext4_validate_block_bitmap(struct super_block *sb, 1869fa77dcfaSDarrick J. Wong struct ext4_group_desc *desc, 1870fa77dcfaSDarrick J. Wong unsigned int block_group, 1871fa77dcfaSDarrick J. Wong struct buffer_head *bh); 18723dcf5451SChristoph Hellwig extern unsigned int ext4_block_group(struct super_block *sb, 18733dcf5451SChristoph Hellwig ext4_fsblk_t blocknr); 18743dcf5451SChristoph Hellwig extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 18753dcf5451SChristoph Hellwig ext4_fsblk_t blocknr); 18763dcf5451SChristoph Hellwig extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 18773dcf5451SChristoph Hellwig extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 18783dcf5451SChristoph Hellwig ext4_group_t group); 18797061eba7SAneesh Kumar K.V extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 188055f020dbSAllison Henderson ext4_fsblk_t goal, 188155f020dbSAllison Henderson unsigned int flags, 188255f020dbSAllison Henderson unsigned long *count, 188355f020dbSAllison Henderson int *errp); 1884e7d5f315STheodore Ts'o extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 1885e7d5f315STheodore Ts'o s64 nclusters, unsigned int flags); 18865dee5437STheodore Ts'o extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 18873dcf5451SChristoph Hellwig extern void ext4_check_blocks_bitmap(struct super_block *); 18883dcf5451SChristoph Hellwig extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 18893dcf5451SChristoph Hellwig ext4_group_t block_group, 18903dcf5451SChristoph Hellwig struct buffer_head ** bh); 18913dcf5451SChristoph Hellwig extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1892813e5727STheodore Ts'o 1893813e5727STheodore Ts'o extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 1894813e5727STheodore Ts'o ext4_group_t block_group); 1895813e5727STheodore Ts'o extern int ext4_wait_block_bitmap(struct super_block *sb, 1896813e5727STheodore Ts'o ext4_group_t block_group, 1897813e5727STheodore Ts'o struct buffer_head *bh); 1898813e5727STheodore Ts'o extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1899bb23c20aSTheodore Ts'o ext4_group_t block_group); 1900fd034a84STheodore Ts'o extern void ext4_init_block_bitmap(struct super_block *sb, 1901bb23c20aSTheodore Ts'o struct buffer_head *bh, 1902bb23c20aSTheodore Ts'o ext4_group_t group, 1903bb23c20aSTheodore Ts'o struct ext4_group_desc *desc); 1904cff1dfd7STheodore Ts'o extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 1905fd034a84STheodore Ts'o ext4_group_t block_group, 1906fd034a84STheodore Ts'o struct ext4_group_desc *gdp); 1907d5b8f310STheodore Ts'o extern unsigned ext4_num_overhead_clusters(struct super_block *sb, 1908d5b8f310STheodore Ts'o ext4_group_t block_group, 1909d5b8f310STheodore Ts'o struct ext4_group_desc *gdp); 1910f86186b4SEric Sandeen ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 19113dcf5451SChristoph Hellwig 19123dcf5451SChristoph Hellwig /* dir.c */ 191360fd4da3STheodore Ts'o extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 1914f7c21177STheodore Ts'o struct file *, 19153dcf5451SChristoph Hellwig struct ext4_dir_entry_2 *, 1916498e5f24STheodore Ts'o struct buffer_head *, unsigned int); 1917f7c21177STheodore Ts'o #define ext4_check_dir_entry(dir, filp, de, bh, offset) \ 1918f7c21177STheodore Ts'o unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 1919f7c21177STheodore Ts'o (de), (bh), (offset))) 19203dcf5451SChristoph Hellwig extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 19213dcf5451SChristoph Hellwig __u32 minor_hash, 19223dcf5451SChristoph Hellwig struct ext4_dir_entry_2 *dirent); 19233dcf5451SChristoph Hellwig extern void ext4_htree_free_dir_info(struct dir_private_info *p); 19243dcf5451SChristoph Hellwig 19253dcf5451SChristoph Hellwig /* fsync.c */ 192602c24a82SJosef Bacik extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 19273889fd57SJiaying Zhang extern int ext4_flush_completed_IO(struct inode *); 19283dcf5451SChristoph Hellwig 19293dcf5451SChristoph Hellwig /* hash.c */ 19303dcf5451SChristoph Hellwig extern int ext4fs_dirhash(const char *name, int len, struct 19313dcf5451SChristoph Hellwig dx_hash_info *hinfo); 19323dcf5451SChristoph Hellwig 19333dcf5451SChristoph Hellwig /* ialloc.c */ 1934dcca3fecSAl Viro extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t, 19355cb81dabSDmitry Monakhov const struct qstr *qstr, __u32 goal, 19365cb81dabSDmitry Monakhov uid_t *owner); 19373dcf5451SChristoph Hellwig extern void ext4_free_inode(handle_t *, struct inode *); 19383dcf5451SChristoph Hellwig extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 19393dcf5451SChristoph Hellwig extern unsigned long ext4_count_free_inodes(struct super_block *); 19403dcf5451SChristoph Hellwig extern unsigned long ext4_count_dirs(struct super_block *); 19413dcf5451SChristoph Hellwig extern void ext4_check_inodes_bitmap(struct super_block *); 194261d08673STheodore Ts'o extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 1943bfff6873SLukas Czerner extern int ext4_init_inode_table(struct super_block *sb, 1944bfff6873SLukas Czerner ext4_group_t group, int barrier); 1945813e5727STheodore Ts'o extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 19463dcf5451SChristoph Hellwig 19473dcf5451SChristoph Hellwig /* mballoc.c */ 19483dcf5451SChristoph Hellwig extern long ext4_mb_stats; 19493dcf5451SChristoph Hellwig extern long ext4_mb_max_to_scan; 19503dcf5451SChristoph Hellwig extern int ext4_mb_init(struct super_block *, int); 19513dcf5451SChristoph Hellwig extern int ext4_mb_release(struct super_block *); 19523dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 19533dcf5451SChristoph Hellwig struct ext4_allocation_request *, int *); 19543dcf5451SChristoph Hellwig extern int ext4_mb_reserve_blocks(struct super_block *, int); 1955c2ea3fdeSTheodore Ts'o extern void ext4_discard_preallocations(struct inode *); 19565dabfc78STheodore Ts'o extern int __init ext4_init_mballoc(void); 19575dabfc78STheodore Ts'o extern void ext4_exit_mballoc(void); 195844338711STheodore Ts'o extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1959e6362609STheodore Ts'o struct buffer_head *bh, ext4_fsblk_t block, 1960e6362609STheodore Ts'o unsigned long count, int flags); 1961920313a7SAneesh Kumar K.V extern int ext4_mb_add_groupinfo(struct super_block *sb, 19625f21b0e6SFrederic Bohe ext4_group_t i, struct ext4_group_desc *desc); 1963cc7365dfSYongqiang Yang extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 19642846e820SAmir Goldstein ext4_fsblk_t block, unsigned long count); 19657360d173SLukas Czerner extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 19667360d173SLukas Czerner 19673dcf5451SChristoph Hellwig /* inode.c */ 19683dcf5451SChristoph Hellwig struct buffer_head *ext4_getblk(handle_t *, struct inode *, 19693dcf5451SChristoph Hellwig ext4_lblk_t, int, int *); 19703dcf5451SChristoph Hellwig struct buffer_head *ext4_bread(handle_t *, struct inode *, 19713dcf5451SChristoph Hellwig ext4_lblk_t, int, int *); 19726873fa0dSEric Sandeen int ext4_get_block(struct inode *inode, sector_t iblock, 19736873fa0dSEric Sandeen struct buffer_head *bh_result, int create); 19743dcf5451SChristoph Hellwig 19753dcf5451SChristoph Hellwig extern struct inode *ext4_iget(struct super_block *, unsigned long); 1976a9185b41SChristoph Hellwig extern int ext4_write_inode(struct inode *, struct writeback_control *); 19773dcf5451SChristoph Hellwig extern int ext4_setattr(struct dentry *, struct iattr *); 19783e3398a0SMingming Cao extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 19793e3398a0SMingming Cao struct kstat *stat); 19800930fcc1SAl Viro extern void ext4_evict_inode(struct inode *); 19810930fcc1SAl Viro extern void ext4_clear_inode(struct inode *); 19823dcf5451SChristoph Hellwig extern int ext4_sync_inode(handle_t *, struct inode *); 1983aa385729SChristoph Hellwig extern void ext4_dirty_inode(struct inode *, int); 19843dcf5451SChristoph Hellwig extern int ext4_change_inode_journal_flag(struct inode *, int); 19853dcf5451SChristoph Hellwig extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 198691ef4cafSDuane Griffin extern int ext4_can_truncate(struct inode *inode); 19873dcf5451SChristoph Hellwig extern void ext4_truncate(struct inode *); 1988a4bb6b64SAllison Henderson extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); 1989487caeefSJan Kara extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 19903dcf5451SChristoph Hellwig extern void ext4_set_inode_flags(struct inode *); 19913dcf5451SChristoph Hellwig extern void ext4_get_inode_flags(struct ext4_inode_info *); 1992ccd2506bSTheodore Ts'o extern int ext4_alloc_da_blocks(struct inode *inode); 19933dcf5451SChristoph Hellwig extern void ext4_set_aops(struct inode *inode); 19943dcf5451SChristoph Hellwig extern int ext4_writepage_trans_blocks(struct inode *); 1995f3bd1f3fSMingming Cao extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 19964e96b2dbSAllison Henderson extern int ext4_discard_partial_page_buffers(handle_t *handle, 19974e96b2dbSAllison Henderson struct address_space *mapping, loff_t from, 19984e96b2dbSAllison Henderson loff_t length, int flags); 1999c2ec175cSNick Piggin extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2000a9e7f447SDmitry Monakhov extern qsize_t *ext4_get_reserved_space(struct inode *inode); 20015f634d06SAneesh Kumar K.V extern void ext4_da_update_reserve_space(struct inode *inode, 20025f634d06SAneesh Kumar K.V int used, int quota_claim); 2003dae1e52cSAmir Goldstein 2004dae1e52cSAmir Goldstein /* indirect.c */ 2005dae1e52cSAmir Goldstein extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2006dae1e52cSAmir Goldstein struct ext4_map_blocks *map, int flags); 2007dae1e52cSAmir Goldstein extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, 2008dae1e52cSAmir Goldstein const struct iovec *iov, loff_t offset, 2009dae1e52cSAmir Goldstein unsigned long nr_segs); 2010dae1e52cSAmir Goldstein extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2011dae1e52cSAmir Goldstein extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk); 2012ff9893dcSAmir Goldstein extern void ext4_ind_truncate(struct inode *inode); 2013ff9893dcSAmir Goldstein 20143dcf5451SChristoph Hellwig /* ioctl.c */ 20153dcf5451SChristoph Hellwig extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 20163dcf5451SChristoph Hellwig extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 20173dcf5451SChristoph Hellwig 20183dcf5451SChristoph Hellwig /* migrate.c */ 20192a43a878SAneesh Kumar K.V extern int ext4_ext_migrate(struct inode *); 20203d0518f4SWei Yongjun 20213dcf5451SChristoph Hellwig /* namei.c */ 2022b0336e8dSDarrick J. Wong extern int ext4_dirent_csum_verify(struct inode *inode, 2023b0336e8dSDarrick J. Wong struct ext4_dir_entry *dirent); 20243dcf5451SChristoph Hellwig extern int ext4_orphan_add(handle_t *, struct inode *); 20253dcf5451SChristoph Hellwig extern int ext4_orphan_del(handle_t *, struct inode *); 20263dcf5451SChristoph Hellwig extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 20273dcf5451SChristoph Hellwig __u32 start_minor_hash, __u32 *next_hash); 20283dcf5451SChristoph Hellwig 20293dcf5451SChristoph Hellwig /* resize.c */ 20303dcf5451SChristoph Hellwig extern int ext4_group_add(struct super_block *sb, 20313dcf5451SChristoph Hellwig struct ext4_new_group_data *input); 20323dcf5451SChristoph Hellwig extern int ext4_group_extend(struct super_block *sb, 20333dcf5451SChristoph Hellwig struct ext4_super_block *es, 20343dcf5451SChristoph Hellwig ext4_fsblk_t n_blocks_count); 203519c5246dSYongqiang Yang extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 20363dcf5451SChristoph Hellwig 20373dcf5451SChristoph Hellwig /* super.c */ 2038a9c47317SDarrick J. Wong extern int ext4_superblock_csum_verify(struct super_block *sb, 2039a9c47317SDarrick J. Wong struct ext4_super_block *es); 2040a9c47317SDarrick J. Wong extern void ext4_superblock_csum_set(struct super_block *sb, 2041a9c47317SDarrick J. Wong struct ext4_super_block *es); 20429933fc0aSTheodore Ts'o extern void *ext4_kvmalloc(size_t size, gfp_t flags); 20439933fc0aSTheodore Ts'o extern void *ext4_kvzalloc(size_t size, gfp_t flags); 20449933fc0aSTheodore Ts'o extern void ext4_kvfree(void *ptr); 2045b9075fa9SJoe Perches extern __printf(4, 5) 2046b9075fa9SJoe Perches void __ext4_error(struct super_block *, const char *, unsigned int, 2047b9075fa9SJoe Perches const char *, ...); 2048c398eda0STheodore Ts'o #define ext4_error(sb, message...) __ext4_error(sb, __func__, \ 2049c398eda0STheodore Ts'o __LINE__, ## message) 2050b9075fa9SJoe Perches extern __printf(5, 6) 2051b9075fa9SJoe Perches void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2052b9075fa9SJoe Perches const char *, ...); 2053b9075fa9SJoe Perches extern __printf(5, 6) 2054b9075fa9SJoe Perches void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2055b9075fa9SJoe Perches const char *, ...); 2056c398eda0STheodore Ts'o extern void __ext4_std_error(struct super_block *, const char *, 2057c398eda0STheodore Ts'o unsigned int, int); 2058b9075fa9SJoe Perches extern __printf(4, 5) 2059b9075fa9SJoe Perches void __ext4_abort(struct super_block *, const char *, unsigned int, 2060b9075fa9SJoe Perches const char *, ...); 2061c398eda0STheodore Ts'o #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \ 2062c398eda0STheodore Ts'o __LINE__, ## message) 2063b9075fa9SJoe Perches extern __printf(4, 5) 2064b9075fa9SJoe Perches void __ext4_warning(struct super_block *, const char *, unsigned int, 2065b9075fa9SJoe Perches const char *, ...); 2066c398eda0STheodore Ts'o #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \ 2067c398eda0STheodore Ts'o __LINE__, ## message) 2068b9075fa9SJoe Perches extern __printf(3, 4) 2069b9075fa9SJoe Perches void ext4_msg(struct super_block *, const char *, const char *, ...); 2070c5e06d10SJohann Lombardi extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2071c5e06d10SJohann Lombardi const char *, unsigned int, const char *); 2072c5e06d10SJohann Lombardi #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \ 2073c5e06d10SJohann Lombardi __LINE__, msg) 2074b9075fa9SJoe Perches extern __printf(7, 8) 2075b9075fa9SJoe Perches void __ext4_grp_locked_error(const char *, unsigned int, 2076b9075fa9SJoe Perches struct super_block *, ext4_group_t, 2077b9075fa9SJoe Perches unsigned long, ext4_fsblk_t, 2078b9075fa9SJoe Perches const char *, ...); 2079e29136f8STheodore Ts'o #define ext4_grp_locked_error(sb, grp, message...) \ 2080e29136f8STheodore Ts'o __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message) 20813dcf5451SChristoph Hellwig extern void ext4_update_dynamic_rev(struct super_block *sb); 20823dcf5451SChristoph Hellwig extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 20833dcf5451SChristoph Hellwig __u32 compat); 20843dcf5451SChristoph Hellwig extern int ext4_update_rocompat_feature(handle_t *handle, 20853dcf5451SChristoph Hellwig struct super_block *sb, __u32 rocompat); 20863dcf5451SChristoph Hellwig extern int ext4_update_incompat_feature(handle_t *handle, 20873dcf5451SChristoph Hellwig struct super_block *sb, __u32 incompat); 20883dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 20893dcf5451SChristoph Hellwig struct ext4_group_desc *bg); 20903dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 20913dcf5451SChristoph Hellwig struct ext4_group_desc *bg); 20923dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 20933dcf5451SChristoph Hellwig struct ext4_group_desc *bg); 2094021b65bbSTheodore Ts'o extern __u32 ext4_free_group_clusters(struct super_block *sb, 2095560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 2096560671a0SAneesh Kumar K.V extern __u32 ext4_free_inodes_count(struct super_block *sb, 2097560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 2098560671a0SAneesh Kumar K.V extern __u32 ext4_used_dirs_count(struct super_block *sb, 2099560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 2100560671a0SAneesh Kumar K.V extern __u32 ext4_itable_unused_count(struct super_block *sb, 2101560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 21023dcf5451SChristoph Hellwig extern void ext4_block_bitmap_set(struct super_block *sb, 21033dcf5451SChristoph Hellwig struct ext4_group_desc *bg, ext4_fsblk_t blk); 21043dcf5451SChristoph Hellwig extern void ext4_inode_bitmap_set(struct super_block *sb, 21053dcf5451SChristoph Hellwig struct ext4_group_desc *bg, ext4_fsblk_t blk); 21063dcf5451SChristoph Hellwig extern void ext4_inode_table_set(struct super_block *sb, 21073dcf5451SChristoph Hellwig struct ext4_group_desc *bg, ext4_fsblk_t blk); 2108021b65bbSTheodore Ts'o extern void ext4_free_group_clusters_set(struct super_block *sb, 2109021b65bbSTheodore Ts'o struct ext4_group_desc *bg, 2110021b65bbSTheodore Ts'o __u32 count); 2111560671a0SAneesh Kumar K.V extern void ext4_free_inodes_set(struct super_block *sb, 2112560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count); 2113560671a0SAneesh Kumar K.V extern void ext4_used_dirs_set(struct super_block *sb, 2114560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count); 2115560671a0SAneesh Kumar K.V extern void ext4_itable_unused_set(struct super_block *sb, 2116560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count); 2117feb0ab32SDarrick J. Wong extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2118bb23c20aSTheodore Ts'o struct ext4_group_desc *gdp); 2119feb0ab32SDarrick J. Wong extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2120bb23c20aSTheodore Ts'o struct ext4_group_desc *gdp); 21213dcf5451SChristoph Hellwig 212241a246d1SDarrick J. Wong static inline int ext4_has_group_desc_csum(struct super_block *sb) 212341a246d1SDarrick J. Wong { 212441a246d1SDarrick J. Wong return EXT4_HAS_RO_COMPAT_FEATURE(sb, 212541a246d1SDarrick J. Wong EXT4_FEATURE_RO_COMPAT_GDT_CSUM | 212641a246d1SDarrick J. Wong EXT4_FEATURE_RO_COMPAT_METADATA_CSUM); 212741a246d1SDarrick J. Wong } 212841a246d1SDarrick J. Wong 21293dcf5451SChristoph Hellwig static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 21303dcf5451SChristoph Hellwig { 21313dcf5451SChristoph Hellwig return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 21323dcf5451SChristoph Hellwig le32_to_cpu(es->s_blocks_count_lo); 21333dcf5451SChristoph Hellwig } 21343dcf5451SChristoph Hellwig 21353dcf5451SChristoph Hellwig static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 21363dcf5451SChristoph Hellwig { 21373dcf5451SChristoph Hellwig return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 21383dcf5451SChristoph Hellwig le32_to_cpu(es->s_r_blocks_count_lo); 21393dcf5451SChristoph Hellwig } 21403dcf5451SChristoph Hellwig 21413dcf5451SChristoph Hellwig static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 21423dcf5451SChristoph Hellwig { 21433dcf5451SChristoph Hellwig return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 21443dcf5451SChristoph Hellwig le32_to_cpu(es->s_free_blocks_count_lo); 21453dcf5451SChristoph Hellwig } 21463dcf5451SChristoph Hellwig 21473dcf5451SChristoph Hellwig static inline void ext4_blocks_count_set(struct ext4_super_block *es, 21483dcf5451SChristoph Hellwig ext4_fsblk_t blk) 21493dcf5451SChristoph Hellwig { 21503dcf5451SChristoph Hellwig es->s_blocks_count_lo = cpu_to_le32((u32)blk); 21513dcf5451SChristoph Hellwig es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 21523dcf5451SChristoph Hellwig } 21533dcf5451SChristoph Hellwig 21543dcf5451SChristoph Hellwig static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 21553dcf5451SChristoph Hellwig ext4_fsblk_t blk) 21563dcf5451SChristoph Hellwig { 21573dcf5451SChristoph Hellwig es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 21583dcf5451SChristoph Hellwig es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 21593dcf5451SChristoph Hellwig } 21603dcf5451SChristoph Hellwig 21613dcf5451SChristoph Hellwig static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 21623dcf5451SChristoph Hellwig ext4_fsblk_t blk) 21633dcf5451SChristoph Hellwig { 21643dcf5451SChristoph Hellwig es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 21653dcf5451SChristoph Hellwig es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 21663dcf5451SChristoph Hellwig } 21673dcf5451SChristoph Hellwig 21683dcf5451SChristoph Hellwig static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 21693dcf5451SChristoph Hellwig { 217006a279d6STheodore Ts'o if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 21713dcf5451SChristoph Hellwig return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 21723dcf5451SChristoph Hellwig le32_to_cpu(raw_inode->i_size_lo); 217306a279d6STheodore Ts'o else 217406a279d6STheodore Ts'o return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 21753dcf5451SChristoph Hellwig } 21763dcf5451SChristoph Hellwig 21773dcf5451SChristoph Hellwig static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 21783dcf5451SChristoph Hellwig { 21793dcf5451SChristoph Hellwig raw_inode->i_size_lo = cpu_to_le32(i_size); 21803dcf5451SChristoph Hellwig raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 21813dcf5451SChristoph Hellwig } 21823dcf5451SChristoph Hellwig 21833dcf5451SChristoph Hellwig static inline 21843dcf5451SChristoph Hellwig struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 21853dcf5451SChristoph Hellwig ext4_group_t group) 21863dcf5451SChristoph Hellwig { 21873dcf5451SChristoph Hellwig struct ext4_group_info ***grp_info; 21883dcf5451SChristoph Hellwig long indexv, indexh; 21893dcf5451SChristoph Hellwig grp_info = EXT4_SB(sb)->s_group_info; 21903dcf5451SChristoph Hellwig indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 21913dcf5451SChristoph Hellwig indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 21923dcf5451SChristoph Hellwig return grp_info[indexv][indexh]; 21933dcf5451SChristoph Hellwig } 21943dcf5451SChristoph Hellwig 21958df9675fSTheodore Ts'o /* 21968df9675fSTheodore Ts'o * Reading s_groups_count requires using smp_rmb() afterwards. See 21978df9675fSTheodore Ts'o * the locking protocol documented in the comments of ext4_group_add() 21988df9675fSTheodore Ts'o * in resize.c 21998df9675fSTheodore Ts'o */ 22008df9675fSTheodore Ts'o static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 22018df9675fSTheodore Ts'o { 22028df9675fSTheodore Ts'o ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 22038df9675fSTheodore Ts'o 22048df9675fSTheodore Ts'o smp_rmb(); 22058df9675fSTheodore Ts'o return ngroups; 22068df9675fSTheodore Ts'o } 22073dcf5451SChristoph Hellwig 2208772cb7c8SJose R. Santos static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2209772cb7c8SJose R. Santos ext4_group_t block_group) 2210772cb7c8SJose R. Santos { 2211772cb7c8SJose R. Santos return block_group >> sbi->s_log_groups_per_flex; 2212772cb7c8SJose R. Santos } 2213772cb7c8SJose R. Santos 2214772cb7c8SJose R. Santos static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2215772cb7c8SJose R. Santos { 2216772cb7c8SJose R. Santos return 1 << sbi->s_log_groups_per_flex; 2217772cb7c8SJose R. Santos } 2218772cb7c8SJose R. Santos 22193dcf5451SChristoph Hellwig #define ext4_std_error(sb, errno) \ 22203dcf5451SChristoph Hellwig do { \ 22213dcf5451SChristoph Hellwig if ((errno)) \ 2222c398eda0STheodore Ts'o __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 22233dcf5451SChristoph Hellwig } while (0) 22243dcf5451SChristoph Hellwig 2225a30d542aSAneesh Kumar K.V #ifdef CONFIG_SMP 2226df55c99dSTheodore Ts'o /* Each CPU can accumulate percpu_counter_batch clusters in their local 2227df55c99dSTheodore Ts'o * counters. So we need to make sure we have free clusters more 2228179f7ebfSEric Dumazet * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2229a30d542aSAneesh Kumar K.V */ 2230df55c99dSTheodore Ts'o #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2231a30d542aSAneesh Kumar K.V #else 2232df55c99dSTheodore Ts'o #define EXT4_FREECLUSTERS_WATERMARK 0 2233a30d542aSAneesh Kumar K.V #endif 2234a30d542aSAneesh Kumar K.V 2235cf17fea6SAneesh Kumar K.V static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2236cf17fea6SAneesh Kumar K.V { 2237cf17fea6SAneesh Kumar K.V /* 2238cf17fea6SAneesh Kumar K.V * XXX: replace with spinlock if seen contended -bzzz 2239cf17fea6SAneesh Kumar K.V */ 2240cf17fea6SAneesh Kumar K.V down_write(&EXT4_I(inode)->i_data_sem); 2241cf17fea6SAneesh Kumar K.V if (newsize > EXT4_I(inode)->i_disksize) 2242cf17fea6SAneesh Kumar K.V EXT4_I(inode)->i_disksize = newsize; 2243cf17fea6SAneesh Kumar K.V up_write(&EXT4_I(inode)->i_data_sem); 2244cf17fea6SAneesh Kumar K.V return ; 2245cf17fea6SAneesh Kumar K.V } 2246a30d542aSAneesh Kumar K.V 22475d1b1b3fSAneesh Kumar K.V struct ext4_group_info { 22485d1b1b3fSAneesh Kumar K.V unsigned long bb_state; 22495d1b1b3fSAneesh Kumar K.V struct rb_root bb_free_root; 2250a36b4498SEric Sandeen ext4_grpblk_t bb_first_free; /* first free block */ 2251a36b4498SEric Sandeen ext4_grpblk_t bb_free; /* total free blocks */ 2252a36b4498SEric Sandeen ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 22538a57d9d6SCurt Wohlgemuth ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 22545d1b1b3fSAneesh Kumar K.V struct list_head bb_prealloc_list; 22555d1b1b3fSAneesh Kumar K.V #ifdef DOUBLE_CHECK 22565d1b1b3fSAneesh Kumar K.V void *bb_bitmap; 22575d1b1b3fSAneesh Kumar K.V #endif 22585d1b1b3fSAneesh Kumar K.V struct rw_semaphore alloc_sem; 2259a36b4498SEric Sandeen ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2260a36b4498SEric Sandeen * regions, index is order. 2261a36b4498SEric Sandeen * bb_counters[3] = 5 means 2262a36b4498SEric Sandeen * 5 free 8-block regions. */ 22635d1b1b3fSAneesh Kumar K.V }; 22645d1b1b3fSAneesh Kumar K.V 22655d1b1b3fSAneesh Kumar K.V #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 22663d56b8d2STao Ma #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 22675d1b1b3fSAneesh Kumar K.V 22685d1b1b3fSAneesh Kumar K.V #define EXT4_MB_GRP_NEED_INIT(grp) \ 22695d1b1b3fSAneesh Kumar K.V (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 22705d1b1b3fSAneesh Kumar K.V 22713d56b8d2STao Ma #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 22723d56b8d2STao Ma (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 22733d56b8d2STao Ma #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 22743d56b8d2STao Ma (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 22753d56b8d2STao Ma #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 22763d56b8d2STao Ma (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 22773d56b8d2STao Ma 227850797481STheodore Ts'o #define EXT4_MAX_CONTENTION 8 227950797481STheodore Ts'o #define EXT4_CONTENTION_THRESHOLD 2 228050797481STheodore Ts'o 2281955ce5f5SAneesh Kumar K.V static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2282955ce5f5SAneesh Kumar K.V ext4_group_t group) 2283955ce5f5SAneesh Kumar K.V { 2284955ce5f5SAneesh Kumar K.V return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2285955ce5f5SAneesh Kumar K.V } 2286955ce5f5SAneesh Kumar K.V 228750797481STheodore Ts'o /* 228850797481STheodore Ts'o * Returns true if the filesystem is busy enough that attempts to 228950797481STheodore Ts'o * access the block group locks has run into contention. 229050797481STheodore Ts'o */ 229150797481STheodore Ts'o static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 229250797481STheodore Ts'o { 229350797481STheodore Ts'o return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 229450797481STheodore Ts'o } 229550797481STheodore Ts'o 22965d1b1b3fSAneesh Kumar K.V static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 22975d1b1b3fSAneesh Kumar K.V { 229850797481STheodore Ts'o spinlock_t *lock = ext4_group_lock_ptr(sb, group); 229950797481STheodore Ts'o if (spin_trylock(lock)) 230050797481STheodore Ts'o /* 230150797481STheodore Ts'o * We're able to grab the lock right away, so drop the 230250797481STheodore Ts'o * lock contention counter. 230350797481STheodore Ts'o */ 230450797481STheodore Ts'o atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 230550797481STheodore Ts'o else { 230650797481STheodore Ts'o /* 230750797481STheodore Ts'o * The lock is busy, so bump the contention counter, 230850797481STheodore Ts'o * and then wait on the spin lock. 230950797481STheodore Ts'o */ 231050797481STheodore Ts'o atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 231150797481STheodore Ts'o EXT4_MAX_CONTENTION); 231250797481STheodore Ts'o spin_lock(lock); 231350797481STheodore Ts'o } 23145d1b1b3fSAneesh Kumar K.V } 23155d1b1b3fSAneesh Kumar K.V 23165d1b1b3fSAneesh Kumar K.V static inline void ext4_unlock_group(struct super_block *sb, 23175d1b1b3fSAneesh Kumar K.V ext4_group_t group) 23185d1b1b3fSAneesh Kumar K.V { 2319955ce5f5SAneesh Kumar K.V spin_unlock(ext4_group_lock_ptr(sb, group)); 23205d1b1b3fSAneesh Kumar K.V } 23215d1b1b3fSAneesh Kumar K.V 2322a0375156STheodore Ts'o static inline void ext4_mark_super_dirty(struct super_block *sb) 2323a0375156STheodore Ts'o { 2324a9c47317SDarrick J. Wong struct ext4_super_block *es = EXT4_SB(sb)->s_es; 2325a9c47317SDarrick J. Wong 2326a9c47317SDarrick J. Wong ext4_superblock_csum_set(sb, es); 2327a0375156STheodore Ts'o if (EXT4_SB(sb)->s_journal == NULL) 2328a0375156STheodore Ts'o sb->s_dirt =1; 2329a0375156STheodore Ts'o } 2330a0375156STheodore Ts'o 23313dcf5451SChristoph Hellwig /* 23321f7d1e77STheodore Ts'o * Block validity checking 23331f7d1e77STheodore Ts'o */ 23341f7d1e77STheodore Ts'o #define ext4_check_indirect_blockref(inode, bh) \ 23351f7d1e77STheodore Ts'o ext4_check_blockref(__func__, __LINE__, inode, \ 23361f7d1e77STheodore Ts'o (__le32 *)(bh)->b_data, \ 23371f7d1e77STheodore Ts'o EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 23381f7d1e77STheodore Ts'o 23391f7d1e77STheodore Ts'o #define ext4_ind_check_inode(inode) \ 23401f7d1e77STheodore Ts'o ext4_check_blockref(__func__, __LINE__, inode, \ 23411f7d1e77STheodore Ts'o EXT4_I(inode)->i_data, \ 23421f7d1e77STheodore Ts'o EXT4_NDIR_BLOCKS) 23431f7d1e77STheodore Ts'o 23441f7d1e77STheodore Ts'o /* 23453dcf5451SChristoph Hellwig * Inodes and files operations 23463dcf5451SChristoph Hellwig */ 23473dcf5451SChristoph Hellwig 23483dcf5451SChristoph Hellwig /* dir.c */ 23493dcf5451SChristoph Hellwig extern const struct file_operations ext4_dir_operations; 23503dcf5451SChristoph Hellwig 23513dcf5451SChristoph Hellwig /* file.c */ 23523dcf5451SChristoph Hellwig extern const struct inode_operations ext4_file_inode_operations; 23533dcf5451SChristoph Hellwig extern const struct file_operations ext4_file_operations; 2354e0d10bfaSToshiyuki Okajima extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 23553dcf5451SChristoph Hellwig 23563dcf5451SChristoph Hellwig /* namei.c */ 23573dcf5451SChristoph Hellwig extern const struct inode_operations ext4_dir_inode_operations; 23583dcf5451SChristoph Hellwig extern const struct inode_operations ext4_special_inode_operations; 2359596397b7STheodore Ts'o extern struct dentry *ext4_get_parent(struct dentry *child); 23603dcf5451SChristoph Hellwig 23613dcf5451SChristoph Hellwig /* symlink.c */ 23623dcf5451SChristoph Hellwig extern const struct inode_operations ext4_symlink_inode_operations; 23633dcf5451SChristoph Hellwig extern const struct inode_operations ext4_fast_symlink_inode_operations; 23643dcf5451SChristoph Hellwig 23656fd058f7STheodore Ts'o /* block_validity */ 23666fd058f7STheodore Ts'o extern void ext4_release_system_zone(struct super_block *sb); 23676fd058f7STheodore Ts'o extern int ext4_setup_system_zone(struct super_block *sb); 23685dabfc78STheodore Ts'o extern int __init ext4_init_system_zone(void); 23695dabfc78STheodore Ts'o extern void ext4_exit_system_zone(void); 23706fd058f7STheodore Ts'o extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 23716fd058f7STheodore Ts'o ext4_fsblk_t start_blk, 23726fd058f7STheodore Ts'o unsigned int count); 23731f7d1e77STheodore Ts'o extern int ext4_check_blockref(const char *, unsigned int, 23741f7d1e77STheodore Ts'o struct inode *, __le32 *, unsigned int); 23756fd058f7STheodore Ts'o 23763dcf5451SChristoph Hellwig /* extents.c */ 23773dcf5451SChristoph Hellwig extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 23783dcf5451SChristoph Hellwig extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2379a02908f1SMingming Cao extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 2380a02908f1SMingming Cao int chunk); 2381e35fd660STheodore Ts'o extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2382e35fd660STheodore Ts'o struct ext4_map_blocks *map, int flags); 2383cf108bcaSJan Kara extern void ext4_ext_truncate(struct inode *); 2384a4bb6b64SAllison Henderson extern int ext4_ext_punch_hole(struct file *file, loff_t offset, 2385a4bb6b64SAllison Henderson loff_t length); 23863dcf5451SChristoph Hellwig extern void ext4_ext_init(struct super_block *); 23873dcf5451SChristoph Hellwig extern void ext4_ext_release(struct super_block *); 23882fe17c10SChristoph Hellwig extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 23893dcf5451SChristoph Hellwig loff_t len); 23900031462bSMingming Cao extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, 2391a1de02dcSEric Sandeen ssize_t len); 2392e35fd660STheodore Ts'o extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2393e35fd660STheodore Ts'o struct ext4_map_blocks *map, int flags); 23943a06d778SAneesh Kumar K.V extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 23953a06d778SAneesh Kumar K.V __u64 start, __u64 len); 2396748de673SAkira Fujita /* move_extent.c */ 2397748de673SAkira Fujita extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2398748de673SAkira Fujita __u64 start_orig, __u64 start_donor, 2399748de673SAkira Fujita __u64 len, __u64 *moved_len); 2400748de673SAkira Fujita 2401bd2d0210STheodore Ts'o /* page-io.c */ 24025dabfc78STheodore Ts'o extern int __init ext4_init_pageio(void); 24035dabfc78STheodore Ts'o extern void ext4_exit_pageio(void); 2404f7ad6d2eSTheodore Ts'o extern void ext4_ioend_wait(struct inode *); 2405bd2d0210STheodore Ts'o extern void ext4_free_io_end(ext4_io_end_t *io); 2406bd2d0210STheodore Ts'o extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 2407bd2d0210STheodore Ts'o extern int ext4_end_io_nolock(ext4_io_end_t *io); 2408bd2d0210STheodore Ts'o extern void ext4_io_submit(struct ext4_io_submit *io); 2409bd2d0210STheodore Ts'o extern int ext4_bio_write_page(struct ext4_io_submit *io, 2410bd2d0210STheodore Ts'o struct page *page, 2411bd2d0210STheodore Ts'o int len, 2412bd2d0210STheodore Ts'o struct writeback_control *wbc); 24133a06d778SAneesh Kumar K.V 2414c5e06d10SJohann Lombardi /* mmp.c */ 2415c5e06d10SJohann Lombardi extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 2416c5e06d10SJohann Lombardi 2417744692dcSJiaying Zhang /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ 2418744692dcSJiaying Zhang enum ext4_state_bits { 2419744692dcSJiaying Zhang BH_Uninit /* blocks are allocated but uninitialized on disk */ 2420744692dcSJiaying Zhang = BH_JBDPrivateStart, 24217b415bf6SAditya Kali BH_AllocFromCluster, /* allocated blocks were part of already 24227b415bf6SAditya Kali * allocated cluster. Note that this flag will 24237b415bf6SAditya Kali * never, ever appear in a buffer_head's state 24247b415bf6SAditya Kali * flag. See EXT4_MAP_FROM_CLUSTER to see where 24257b415bf6SAditya Kali * this is used. */ 24265356f261SAditya Kali BH_Da_Mapped, /* Delayed allocated block that now has a mapping. This 24275356f261SAditya Kali * flag is set when ext4_map_blocks is called on a 24285356f261SAditya Kali * delayed allocated block to get its real mapping. */ 2429744692dcSJiaying Zhang }; 2430744692dcSJiaying Zhang 2431744692dcSJiaying Zhang BUFFER_FNS(Uninit, uninit) 2432744692dcSJiaying Zhang TAS_BUFFER_FNS(Uninit, uninit) 24335356f261SAditya Kali BUFFER_FNS(Da_Mapped, da_mapped) 2434744692dcSJiaying Zhang 24352ccb5fb9SAneesh Kumar K.V /* 24362ccb5fb9SAneesh Kumar K.V * Add new method to test wether block and inode bitmaps are properly 24372ccb5fb9SAneesh Kumar K.V * initialized. With uninit_bg reading the block from disk is not enough 24382ccb5fb9SAneesh Kumar K.V * to mark the bitmap uptodate. We need to also zero-out the bitmap 24392ccb5fb9SAneesh Kumar K.V */ 24402ccb5fb9SAneesh Kumar K.V #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 24412ccb5fb9SAneesh Kumar K.V 24422ccb5fb9SAneesh Kumar K.V static inline int bitmap_uptodate(struct buffer_head *bh) 24432ccb5fb9SAneesh Kumar K.V { 24442ccb5fb9SAneesh Kumar K.V return (buffer_uptodate(bh) && 24452ccb5fb9SAneesh Kumar K.V test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 24462ccb5fb9SAneesh Kumar K.V } 24472ccb5fb9SAneesh Kumar K.V static inline void set_bitmap_uptodate(struct buffer_head *bh) 24482ccb5fb9SAneesh Kumar K.V { 24492ccb5fb9SAneesh Kumar K.V set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 24502ccb5fb9SAneesh Kumar K.V } 24512ccb5fb9SAneesh Kumar K.V 2452731eb1a0SAkinobu Mita #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 2453731eb1a0SAkinobu Mita 2454e9e3bcecSEric Sandeen /* For ioend & aio unwritten conversion wait queues */ 2455e9e3bcecSEric Sandeen #define EXT4_WQ_HASH_SZ 37 2456e9e3bcecSEric Sandeen #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 2457e9e3bcecSEric Sandeen EXT4_WQ_HASH_SZ]) 2458e9e3bcecSEric Sandeen #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 2459e9e3bcecSEric Sandeen EXT4_WQ_HASH_SZ]) 2460e9e3bcecSEric Sandeen extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 2461e9e3bcecSEric Sandeen extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 2462e9e3bcecSEric Sandeen 24638f82f840SYongqiang Yang #define EXT4_RESIZING 0 24648f82f840SYongqiang Yang extern int ext4_resize_begin(struct super_block *sb); 24658f82f840SYongqiang Yang extern void ext4_resize_end(struct super_block *sb); 24668f82f840SYongqiang Yang 24673dcf5451SChristoph Hellwig #endif /* __KERNEL__ */ 24683dcf5451SChristoph Hellwig 2469d8990240SAditya Kali #include "ext4_extents.h" 2470d8990240SAditya Kali 24713dcf5451SChristoph Hellwig #endif /* _EXT4_H */ 2472