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 604a092d73STheodore Ts'o /* 614a092d73STheodore Ts'o * Turn on EXT_DEBUG to get lots of info about extents operations. 624a092d73STheodore Ts'o */ 634a092d73STheodore Ts'o #define EXT_DEBUG__ 644a092d73STheodore Ts'o #ifdef EXT_DEBUG 654a092d73STheodore Ts'o #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 664a092d73STheodore Ts'o #else 674a092d73STheodore Ts'o #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 684a092d73STheodore Ts'o #endif 694a092d73STheodore Ts'o 70273df556SFrank Mayhar #define EXT4_ERROR_INODE(inode, fmt, a...) \ 71c398eda0STheodore Ts'o ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 72c398eda0STheodore Ts'o 73c398eda0STheodore Ts'o #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 74c398eda0STheodore Ts'o ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 75273df556SFrank Mayhar 76f7c21177STheodore Ts'o #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 77f7c21177STheodore Ts'o ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 78273df556SFrank Mayhar 79d444c3c3STheodore Ts'o /* data type for block offset of block group */ 80d444c3c3STheodore Ts'o typedef int ext4_grpblk_t; 81d444c3c3STheodore Ts'o 82d444c3c3STheodore Ts'o /* data type for filesystem-wide blocks number */ 83d444c3c3STheodore Ts'o typedef unsigned long long ext4_fsblk_t; 84d444c3c3STheodore Ts'o 85d444c3c3STheodore Ts'o /* data type for file logical block number */ 86d444c3c3STheodore Ts'o typedef __u32 ext4_lblk_t; 87d444c3c3STheodore Ts'o 88d444c3c3STheodore Ts'o /* data type for block group number */ 89d444c3c3STheodore Ts'o typedef unsigned int ext4_group_t; 90d444c3c3STheodore Ts'o 91296c355cSTheodore Ts'o /* 92296c355cSTheodore Ts'o * Flags used in mballoc's allocation_context flags field. 93296c355cSTheodore Ts'o * 94296c355cSTheodore Ts'o * Also used to show what's going on for debugging purposes when the 95296c355cSTheodore Ts'o * flag field is exported via the traceport interface 96296c355cSTheodore Ts'o */ 97d444c3c3STheodore Ts'o 983dcf5451SChristoph Hellwig /* prefer goal again. length */ 990ef90db9STheodore Ts'o #define EXT4_MB_HINT_MERGE 0x0001 1003dcf5451SChristoph Hellwig /* blocks already reserved */ 1010ef90db9STheodore Ts'o #define EXT4_MB_HINT_RESERVED 0x0002 1023dcf5451SChristoph Hellwig /* metadata is being allocated */ 1030ef90db9STheodore Ts'o #define EXT4_MB_HINT_METADATA 0x0004 1043dcf5451SChristoph Hellwig /* first blocks in the file */ 1050ef90db9STheodore Ts'o #define EXT4_MB_HINT_FIRST 0x0008 1063dcf5451SChristoph Hellwig /* search for the best chunk */ 1070ef90db9STheodore Ts'o #define EXT4_MB_HINT_BEST 0x0010 1083dcf5451SChristoph Hellwig /* data is being allocated */ 1090ef90db9STheodore Ts'o #define EXT4_MB_HINT_DATA 0x0020 1103dcf5451SChristoph Hellwig /* don't preallocate (for tails) */ 1110ef90db9STheodore Ts'o #define EXT4_MB_HINT_NOPREALLOC 0x0040 1123dcf5451SChristoph Hellwig /* allocate for locality group */ 1130ef90db9STheodore Ts'o #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 1143dcf5451SChristoph Hellwig /* allocate goal blocks or none */ 1150ef90db9STheodore Ts'o #define EXT4_MB_HINT_GOAL_ONLY 0x0100 1163dcf5451SChristoph Hellwig /* goal is meaningful */ 1170ef90db9STheodore Ts'o #define EXT4_MB_HINT_TRY_GOAL 0x0200 118d2a17637SMingming Cao /* blocks already pre-reserved by delayed allocation */ 1190ef90db9STheodore Ts'o #define EXT4_MB_DELALLOC_RESERVED 0x0400 1204ba74d00STheodore Ts'o /* We are doing stream allocation */ 1214ba74d00STheodore Ts'o #define EXT4_MB_STREAM_ALLOC 0x0800 12255f020dbSAllison Henderson /* Use reserved root blocks if needed */ 12355f020dbSAllison Henderson #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 12427dd4385SLukas Czerner /* Use blocks from reserved pool */ 12527dd4385SLukas Czerner #define EXT4_MB_USE_RESERVED 0x2000 1263dcf5451SChristoph Hellwig 1273dcf5451SChristoph Hellwig struct ext4_allocation_request { 1283dcf5451SChristoph Hellwig /* target inode for block we're allocating */ 1293dcf5451SChristoph Hellwig struct inode *inode; 1303dcf5451SChristoph Hellwig /* how many blocks we want to allocate */ 131498e5f24STheodore Ts'o unsigned int len; 132726447d8SEric Sandeen /* logical block in target inode */ 133726447d8SEric Sandeen ext4_lblk_t logical; 134726447d8SEric Sandeen /* the closest logical allocated block to the left */ 135726447d8SEric Sandeen ext4_lblk_t lleft; 136726447d8SEric Sandeen /* the closest logical allocated block to the right */ 137726447d8SEric Sandeen ext4_lblk_t lright; 138726447d8SEric Sandeen /* phys. target (a hint) */ 139726447d8SEric Sandeen ext4_fsblk_t goal; 140726447d8SEric Sandeen /* phys. block for the closest logical allocated block to the left */ 141726447d8SEric Sandeen ext4_fsblk_t pleft; 142726447d8SEric Sandeen /* phys. block for the closest logical allocated block to the right */ 143726447d8SEric Sandeen ext4_fsblk_t pright; 1443dcf5451SChristoph Hellwig /* flags. see above EXT4_MB_HINT_* */ 145498e5f24STheodore Ts'o unsigned int flags; 1463dcf5451SChristoph Hellwig }; 1473dcf5451SChristoph Hellwig 1483dcf5451SChristoph Hellwig /* 149e35fd660STheodore Ts'o * Logical to physical block mapping, used by ext4_map_blocks() 150e35fd660STheodore Ts'o * 151e35fd660STheodore Ts'o * This structure is used to pass requests into ext4_map_blocks() as 152e35fd660STheodore Ts'o * well as to store the information returned by ext4_map_blocks(). It 153e35fd660STheodore Ts'o * takes less room on the stack than a struct buffer_head. 154e35fd660STheodore Ts'o */ 155e35fd660STheodore Ts'o #define EXT4_MAP_NEW (1 << BH_New) 156e35fd660STheodore Ts'o #define EXT4_MAP_MAPPED (1 << BH_Mapped) 157e35fd660STheodore Ts'o #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 158e35fd660STheodore Ts'o #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 159e35fd660STheodore Ts'o #define EXT4_MAP_UNINIT (1 << BH_Uninit) 1607b415bf6SAditya Kali /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of 1617b415bf6SAditya Kali * ext4_map_blocks wants to know whether or not the underlying cluster has 1627b415bf6SAditya Kali * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that 1637b415bf6SAditya Kali * the requested mapping was from previously mapped (or delayed allocated) 1647b415bf6SAditya Kali * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster 1657b415bf6SAditya Kali * should never appear on buffer_head's state flags. 1667b415bf6SAditya Kali */ 1677b415bf6SAditya Kali #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster) 168e35fd660STheodore Ts'o #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 169e35fd660STheodore Ts'o EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 1707b415bf6SAditya Kali EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER) 171e35fd660STheodore Ts'o 172e35fd660STheodore Ts'o struct ext4_map_blocks { 173e35fd660STheodore Ts'o ext4_fsblk_t m_pblk; 174e35fd660STheodore Ts'o ext4_lblk_t m_lblk; 175e35fd660STheodore Ts'o unsigned int m_len; 176e35fd660STheodore Ts'o unsigned int m_flags; 177e35fd660STheodore Ts'o }; 178e35fd660STheodore Ts'o 179e35fd660STheodore Ts'o /* 180b3a3ca8cSTheodore Ts'o * For delayed allocation tracking 181b3a3ca8cSTheodore Ts'o */ 182b3a3ca8cSTheodore Ts'o struct mpage_da_data { 183b3a3ca8cSTheodore Ts'o struct inode *inode; 184b3a3ca8cSTheodore Ts'o sector_t b_blocknr; /* start block number of extent */ 185b3a3ca8cSTheodore Ts'o size_t b_size; /* size of extent */ 186b3a3ca8cSTheodore Ts'o unsigned long b_state; /* state of the extent */ 187b3a3ca8cSTheodore Ts'o unsigned long first_page, next_page; /* extent of pages */ 188b3a3ca8cSTheodore Ts'o struct writeback_control *wbc; 189b3a3ca8cSTheodore Ts'o int io_done; 190b3a3ca8cSTheodore Ts'o int pages_written; 191b3a3ca8cSTheodore Ts'o int retval; 192b3a3ca8cSTheodore Ts'o }; 193bd2d0210STheodore Ts'o 194bd2d0210STheodore Ts'o /* 195bd2d0210STheodore Ts'o * Flags for ext4_io_end->flags 196bd2d0210STheodore Ts'o */ 197bd2d0210STheodore Ts'o #define EXT4_IO_END_UNWRITTEN 0x0001 198bd2d0210STheodore Ts'o #define EXT4_IO_END_ERROR 0x0002 19984c17543SJan Kara #define EXT4_IO_END_DIRECT 0x0004 200bd2d0210STheodore Ts'o 2014188188bSCurt Wohlgemuth /* 2024188188bSCurt Wohlgemuth * For converting uninitialized extents on a work queue. 2034188188bSCurt Wohlgemuth */ 2040031462bSMingming Cao typedef struct ext4_io_end { 2055b3ff237Sjiayingz@google.com (Jiaying Zhang) struct list_head list; /* per-file finished IO list */ 2060031462bSMingming Cao struct inode *inode; /* file being written to */ 2078d5d02e6SMingming Cao unsigned int flag; /* unwritten or not */ 208a1de02dcSEric Sandeen loff_t offset; /* offset in the file */ 209a1de02dcSEric Sandeen ssize_t size; /* size of the extent */ 2105b3ff237Sjiayingz@google.com (Jiaying Zhang) struct kiocb *iocb; /* iocb struct for AIO */ 2115b3ff237Sjiayingz@google.com (Jiaying Zhang) int result; /* error value for AIO */ 21297a851edSJan Kara atomic_t count; /* reference counter */ 2130031462bSMingming Cao } ext4_io_end_t; 2140031462bSMingming Cao 215bd2d0210STheodore Ts'o struct ext4_io_submit { 216bd2d0210STheodore Ts'o int io_op; 217bd2d0210STheodore Ts'o struct bio *io_bio; 218bd2d0210STheodore Ts'o ext4_io_end_t *io_end; 219bd2d0210STheodore Ts'o sector_t io_next_block; 220bd2d0210STheodore Ts'o }; 221bd2d0210STheodore Ts'o 222b3a3ca8cSTheodore Ts'o /* 2233dcf5451SChristoph Hellwig * Special inodes numbers 2243dcf5451SChristoph Hellwig */ 2253dcf5451SChristoph Hellwig #define EXT4_BAD_INO 1 /* Bad blocks inode */ 2263dcf5451SChristoph Hellwig #define EXT4_ROOT_INO 2 /* Root inode */ 227ae812306SAditya Kali #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 228ae812306SAditya Kali #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 2293dcf5451SChristoph Hellwig #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 2303dcf5451SChristoph Hellwig #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 2313dcf5451SChristoph Hellwig #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 2323dcf5451SChristoph Hellwig #define EXT4_JOURNAL_INO 8 /* Journal inode */ 2333dcf5451SChristoph Hellwig 2343dcf5451SChristoph Hellwig /* First non-reserved inode for old ext4 filesystems */ 2353dcf5451SChristoph Hellwig #define EXT4_GOOD_OLD_FIRST_INO 11 2363dcf5451SChristoph Hellwig 2373dcf5451SChristoph Hellwig /* 2383dcf5451SChristoph Hellwig * Maximal count of links to a file 2393dcf5451SChristoph Hellwig */ 2403dcf5451SChristoph Hellwig #define EXT4_LINK_MAX 65000 2413dcf5451SChristoph Hellwig 2423dcf5451SChristoph Hellwig /* 2433dcf5451SChristoph Hellwig * Macro-instructions used to manage several block sizes 2443dcf5451SChristoph Hellwig */ 2453dcf5451SChristoph Hellwig #define EXT4_MIN_BLOCK_SIZE 1024 2463dcf5451SChristoph Hellwig #define EXT4_MAX_BLOCK_SIZE 65536 2473dcf5451SChristoph Hellwig #define EXT4_MIN_BLOCK_LOG_SIZE 10 248fb1813f4SCurt Wohlgemuth #define EXT4_MAX_BLOCK_LOG_SIZE 16 2493dcf5451SChristoph Hellwig #ifdef __KERNEL__ 2503dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 2513dcf5451SChristoph Hellwig #else 2523dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 2533dcf5451SChristoph Hellwig #endif 2543dcf5451SChristoph Hellwig #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 255281b5995STheodore Ts'o #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 256281b5995STheodore Ts'o EXT4_SB(s)->s_cluster_bits) 2573dcf5451SChristoph Hellwig #ifdef __KERNEL__ 2583dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 259281b5995STheodore Ts'o # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 2603dcf5451SChristoph Hellwig #else 2613dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 2623dcf5451SChristoph Hellwig #endif 2633dcf5451SChristoph Hellwig #ifdef __KERNEL__ 2643dcf5451SChristoph Hellwig #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 2653dcf5451SChristoph Hellwig #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 2663dcf5451SChristoph Hellwig #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 2673dcf5451SChristoph Hellwig #else 2683dcf5451SChristoph Hellwig #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 2693dcf5451SChristoph Hellwig EXT4_GOOD_OLD_INODE_SIZE : \ 2703dcf5451SChristoph Hellwig (s)->s_inode_size) 2713dcf5451SChristoph Hellwig #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 2723dcf5451SChristoph Hellwig EXT4_GOOD_OLD_FIRST_INO : \ 2733dcf5451SChristoph Hellwig (s)->s_first_ino) 2743dcf5451SChristoph Hellwig #endif 2753dcf5451SChristoph Hellwig #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 2763dcf5451SChristoph Hellwig 277d5b8f310STheodore Ts'o /* Translate a block number to a cluster number */ 278d5b8f310STheodore Ts'o #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 279d5b8f310STheodore Ts'o /* Translate a cluster number to a block number */ 280d5b8f310STheodore Ts'o #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 281d5b8f310STheodore Ts'o /* Translate # of blks to # of clusters */ 282d5b8f310STheodore Ts'o #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 283d5b8f310STheodore Ts'o (sbi)->s_cluster_bits) 284d5b8f310STheodore Ts'o 2853dcf5451SChristoph Hellwig /* 2863dcf5451SChristoph Hellwig * Structure of a blocks group descriptor 2873dcf5451SChristoph Hellwig */ 2883dcf5451SChristoph Hellwig struct ext4_group_desc 2893dcf5451SChristoph Hellwig { 2903dcf5451SChristoph Hellwig __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 2913dcf5451SChristoph Hellwig __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 2923dcf5451SChristoph Hellwig __le32 bg_inode_table_lo; /* Inodes table block */ 293560671a0SAneesh Kumar K.V __le16 bg_free_blocks_count_lo;/* Free blocks count */ 294560671a0SAneesh Kumar K.V __le16 bg_free_inodes_count_lo;/* Free inodes count */ 295560671a0SAneesh Kumar K.V __le16 bg_used_dirs_count_lo; /* Directories count */ 2963dcf5451SChristoph Hellwig __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 297e6153918SDarrick J. Wong __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 298e6153918SDarrick J. Wong __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 299e6153918SDarrick J. Wong __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 300560671a0SAneesh Kumar K.V __le16 bg_itable_unused_lo; /* Unused inodes count */ 3013dcf5451SChristoph Hellwig __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 3023dcf5451SChristoph Hellwig __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 3033dcf5451SChristoph Hellwig __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 3043dcf5451SChristoph Hellwig __le32 bg_inode_table_hi; /* Inodes table block MSB */ 3053dcf5451SChristoph Hellwig __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 3063dcf5451SChristoph Hellwig __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 3073dcf5451SChristoph Hellwig __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 3083dcf5451SChristoph Hellwig __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 309e6153918SDarrick J. Wong __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 310e6153918SDarrick J. Wong __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 311e6153918SDarrick J. Wong __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 312e6153918SDarrick J. Wong __u32 bg_reserved; 3133dcf5451SChristoph Hellwig }; 3143dcf5451SChristoph Hellwig 31541a246d1SDarrick J. Wong #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 31641a246d1SDarrick J. Wong (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 31741a246d1SDarrick J. Wong sizeof(__le16)) 31841a246d1SDarrick J. Wong #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 31941a246d1SDarrick J. Wong (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 32041a246d1SDarrick J. Wong sizeof(__le16)) 32141a246d1SDarrick J. Wong 322772cb7c8SJose R. Santos /* 323772cb7c8SJose R. Santos * Structure of a flex block group info 324772cb7c8SJose R. Santos */ 325772cb7c8SJose R. Santos 326772cb7c8SJose R. Santos struct flex_groups { 32790ba983fSTheodore Ts'o atomic64_t free_clusters; 3289f24e420STheodore Ts'o atomic_t free_inodes; 3297d39db14STheodore Ts'o atomic_t used_dirs; 330772cb7c8SJose R. Santos }; 331772cb7c8SJose R. Santos 3323dcf5451SChristoph Hellwig #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 3333dcf5451SChristoph Hellwig #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 3343dcf5451SChristoph Hellwig #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 3353dcf5451SChristoph Hellwig 3363dcf5451SChristoph Hellwig /* 3373dcf5451SChristoph Hellwig * Macro-instructions used to manage group descriptors 3383dcf5451SChristoph Hellwig */ 3393dcf5451SChristoph Hellwig #define EXT4_MIN_DESC_SIZE 32 3403dcf5451SChristoph Hellwig #define EXT4_MIN_DESC_SIZE_64BIT 64 3413dcf5451SChristoph Hellwig #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 3423dcf5451SChristoph Hellwig #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 3433dcf5451SChristoph Hellwig #ifdef __KERNEL__ 3443dcf5451SChristoph Hellwig # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 345281b5995STheodore Ts'o # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 3463dcf5451SChristoph Hellwig # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 3473dcf5451SChristoph Hellwig # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 3483dcf5451SChristoph Hellwig # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 3493dcf5451SChristoph Hellwig #else 3503dcf5451SChristoph Hellwig # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 3513dcf5451SChristoph Hellwig # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 3523dcf5451SChristoph Hellwig # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 3533dcf5451SChristoph Hellwig #endif 3543dcf5451SChristoph Hellwig 3553dcf5451SChristoph Hellwig /* 3563dcf5451SChristoph Hellwig * Constants relative to the data blocks 3573dcf5451SChristoph Hellwig */ 3583dcf5451SChristoph Hellwig #define EXT4_NDIR_BLOCKS 12 3593dcf5451SChristoph Hellwig #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 3603dcf5451SChristoph Hellwig #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 3613dcf5451SChristoph Hellwig #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 3623dcf5451SChristoph Hellwig #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 3633dcf5451SChristoph Hellwig 3643dcf5451SChristoph Hellwig /* 3653dcf5451SChristoph Hellwig * Inode flags 3663dcf5451SChristoph Hellwig */ 3673dcf5451SChristoph Hellwig #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 3683dcf5451SChristoph Hellwig #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 3693dcf5451SChristoph Hellwig #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 3703dcf5451SChristoph Hellwig #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 3713dcf5451SChristoph Hellwig #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 3723dcf5451SChristoph Hellwig #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 3733dcf5451SChristoph Hellwig #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 3743dcf5451SChristoph Hellwig #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 3753dcf5451SChristoph Hellwig /* Reserved for compression usage... */ 3763dcf5451SChristoph Hellwig #define EXT4_DIRTY_FL 0x00000100 3773dcf5451SChristoph Hellwig #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 3783dcf5451SChristoph Hellwig #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 3793dcf5451SChristoph Hellwig #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 3803dcf5451SChristoph Hellwig /* End compression flags --- maybe not all used */ 3813dcf5451SChristoph Hellwig #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 3823dcf5451SChristoph Hellwig #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 3833dcf5451SChristoph Hellwig #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 3843dcf5451SChristoph Hellwig #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 3853dcf5451SChristoph Hellwig #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 3863dcf5451SChristoph Hellwig #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 3873dcf5451SChristoph Hellwig #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 3883dcf5451SChristoph Hellwig #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 389f710b4b9STheodore Ts'o #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 390c8d46e41SJiaying Zhang #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 39167cf5b09STao Ma #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 3923dcf5451SChristoph Hellwig #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 3933dcf5451SChristoph Hellwig 394c8d46e41SJiaying Zhang #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 395996bb9fdSTheodore Ts'o #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */ 3963dcf5451SChristoph Hellwig 3978fa43a81SDuane Griffin /* Flags that should be inherited by new inodes from their parent. */ 3988fa43a81SDuane Griffin #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 3991cd9f097STheodore Ts'o EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 4008fa43a81SDuane Griffin EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 4018fa43a81SDuane Griffin EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 4028fa43a81SDuane Griffin 4032dc6b0d4SDuane Griffin /* Flags that are appropriate for regular files (all but dir-specific ones). */ 4042dc6b0d4SDuane Griffin #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 4052dc6b0d4SDuane Griffin 4062dc6b0d4SDuane Griffin /* Flags that are appropriate for non-directories/regular files. */ 4072dc6b0d4SDuane Griffin #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 4082dc6b0d4SDuane Griffin 4092dc6b0d4SDuane Griffin /* Mask out flags that are inappropriate for the given type of inode. */ 4102dc6b0d4SDuane Griffin static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 4112dc6b0d4SDuane Griffin { 4122dc6b0d4SDuane Griffin if (S_ISDIR(mode)) 4132dc6b0d4SDuane Griffin return flags; 4142dc6b0d4SDuane Griffin else if (S_ISREG(mode)) 4152dc6b0d4SDuane Griffin return flags & EXT4_REG_FLMASK; 4162dc6b0d4SDuane Griffin else 4172dc6b0d4SDuane Griffin return flags & EXT4_OTHER_FLMASK; 4182dc6b0d4SDuane Griffin } 4192dc6b0d4SDuane Griffin 42012e9b892SDmitry Monakhov /* 42112e9b892SDmitry Monakhov * Inode flags used for atomic set/get 42212e9b892SDmitry Monakhov */ 42312e9b892SDmitry Monakhov enum { 42412e9b892SDmitry Monakhov EXT4_INODE_SECRM = 0, /* Secure deletion */ 42512e9b892SDmitry Monakhov EXT4_INODE_UNRM = 1, /* Undelete */ 42612e9b892SDmitry Monakhov EXT4_INODE_COMPR = 2, /* Compress file */ 42712e9b892SDmitry Monakhov EXT4_INODE_SYNC = 3, /* Synchronous updates */ 42812e9b892SDmitry Monakhov EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 42912e9b892SDmitry Monakhov EXT4_INODE_APPEND = 5, /* writes to file may only append */ 43012e9b892SDmitry Monakhov EXT4_INODE_NODUMP = 6, /* do not dump file */ 43112e9b892SDmitry Monakhov EXT4_INODE_NOATIME = 7, /* do not update atime */ 43212e9b892SDmitry Monakhov /* Reserved for compression usage... */ 43312e9b892SDmitry Monakhov EXT4_INODE_DIRTY = 8, 43412e9b892SDmitry Monakhov EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 43512e9b892SDmitry Monakhov EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 43612e9b892SDmitry Monakhov EXT4_INODE_ECOMPR = 11, /* Compression error */ 43712e9b892SDmitry Monakhov /* End compression flags --- maybe not all used */ 43812e9b892SDmitry Monakhov EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 43912e9b892SDmitry Monakhov EXT4_INODE_IMAGIC = 13, /* AFS directory */ 44012e9b892SDmitry Monakhov EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 44112e9b892SDmitry Monakhov EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 44212e9b892SDmitry Monakhov EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 44312e9b892SDmitry Monakhov EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 44412e9b892SDmitry Monakhov EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 44512e9b892SDmitry Monakhov EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 44612e9b892SDmitry Monakhov EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 44712e9b892SDmitry Monakhov EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 44867cf5b09STao Ma EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 44912e9b892SDmitry Monakhov EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 45012e9b892SDmitry Monakhov }; 45112e9b892SDmitry Monakhov 45212e9b892SDmitry Monakhov /* 4539a4c8019SCarlos Maiolino * Since it's pretty easy to mix up bit numbers and hex values, we use a 4549a4c8019SCarlos Maiolino * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 4559a4c8019SCarlos Maiolino * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 4569a4c8019SCarlos Maiolino * any extra space in the compiled kernel image, otherwise, the build will fail. 4579a4c8019SCarlos Maiolino * It's important that these values are the same, since we are using 4589a4c8019SCarlos Maiolino * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 4599a4c8019SCarlos Maiolino * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 4609a4c8019SCarlos Maiolino * values found in ext2, ext3 and ext4 filesystems, and of course the values 4619a4c8019SCarlos Maiolino * defined in e2fsprogs. 46212e9b892SDmitry Monakhov * 46312e9b892SDmitry Monakhov * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 46412e9b892SDmitry Monakhov */ 4659a4c8019SCarlos Maiolino #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 4669a4c8019SCarlos Maiolino #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 4679a4c8019SCarlos Maiolino 46812e9b892SDmitry Monakhov static inline void ext4_check_flag_values(void) 46912e9b892SDmitry Monakhov { 47012e9b892SDmitry Monakhov CHECK_FLAG_VALUE(SECRM); 47112e9b892SDmitry Monakhov CHECK_FLAG_VALUE(UNRM); 47212e9b892SDmitry Monakhov CHECK_FLAG_VALUE(COMPR); 47312e9b892SDmitry Monakhov CHECK_FLAG_VALUE(SYNC); 47412e9b892SDmitry Monakhov CHECK_FLAG_VALUE(IMMUTABLE); 47512e9b892SDmitry Monakhov CHECK_FLAG_VALUE(APPEND); 47612e9b892SDmitry Monakhov CHECK_FLAG_VALUE(NODUMP); 47712e9b892SDmitry Monakhov CHECK_FLAG_VALUE(NOATIME); 47812e9b892SDmitry Monakhov CHECK_FLAG_VALUE(DIRTY); 47912e9b892SDmitry Monakhov CHECK_FLAG_VALUE(COMPRBLK); 48012e9b892SDmitry Monakhov CHECK_FLAG_VALUE(NOCOMPR); 48112e9b892SDmitry Monakhov CHECK_FLAG_VALUE(ECOMPR); 48212e9b892SDmitry Monakhov CHECK_FLAG_VALUE(INDEX); 48312e9b892SDmitry Monakhov CHECK_FLAG_VALUE(IMAGIC); 48412e9b892SDmitry Monakhov CHECK_FLAG_VALUE(JOURNAL_DATA); 48512e9b892SDmitry Monakhov CHECK_FLAG_VALUE(NOTAIL); 48612e9b892SDmitry Monakhov CHECK_FLAG_VALUE(DIRSYNC); 48712e9b892SDmitry Monakhov CHECK_FLAG_VALUE(TOPDIR); 48812e9b892SDmitry Monakhov CHECK_FLAG_VALUE(HUGE_FILE); 48912e9b892SDmitry Monakhov CHECK_FLAG_VALUE(EXTENTS); 49012e9b892SDmitry Monakhov CHECK_FLAG_VALUE(EA_INODE); 49112e9b892SDmitry Monakhov CHECK_FLAG_VALUE(EOFBLOCKS); 49267cf5b09STao Ma CHECK_FLAG_VALUE(INLINE_DATA); 49312e9b892SDmitry Monakhov CHECK_FLAG_VALUE(RESERVED); 49412e9b892SDmitry Monakhov } 49512e9b892SDmitry Monakhov 4963dcf5451SChristoph Hellwig /* Used to pass group descriptor data when online resize is done */ 4973dcf5451SChristoph Hellwig struct ext4_new_group_input { 4983dcf5451SChristoph Hellwig __u32 group; /* Group number for this data */ 4993dcf5451SChristoph Hellwig __u64 block_bitmap; /* Absolute block number of block bitmap */ 5003dcf5451SChristoph Hellwig __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 5013dcf5451SChristoph Hellwig __u64 inode_table; /* Absolute block number of inode table start */ 5023dcf5451SChristoph Hellwig __u32 blocks_count; /* Total number of blocks in this group */ 5033dcf5451SChristoph Hellwig __u16 reserved_blocks; /* Number of reserved blocks in this group */ 5043dcf5451SChristoph Hellwig __u16 unused; 5053dcf5451SChristoph Hellwig }; 5063dcf5451SChristoph Hellwig 5074d92dc0fSBen Hutchings #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 5084d92dc0fSBen Hutchings struct compat_ext4_new_group_input { 5094d92dc0fSBen Hutchings u32 group; 5104d92dc0fSBen Hutchings compat_u64 block_bitmap; 5114d92dc0fSBen Hutchings compat_u64 inode_bitmap; 5124d92dc0fSBen Hutchings compat_u64 inode_table; 5134d92dc0fSBen Hutchings u32 blocks_count; 5144d92dc0fSBen Hutchings u16 reserved_blocks; 5154d92dc0fSBen Hutchings u16 unused; 5164d92dc0fSBen Hutchings }; 5174d92dc0fSBen Hutchings #endif 5184d92dc0fSBen Hutchings 5193dcf5451SChristoph Hellwig /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 5203dcf5451SChristoph Hellwig struct ext4_new_group_data { 5213dcf5451SChristoph Hellwig __u32 group; 5223dcf5451SChristoph Hellwig __u64 block_bitmap; 5233dcf5451SChristoph Hellwig __u64 inode_bitmap; 5243dcf5451SChristoph Hellwig __u64 inode_table; 5253dcf5451SChristoph Hellwig __u32 blocks_count; 5263dcf5451SChristoph Hellwig __u16 reserved_blocks; 5273dcf5451SChristoph Hellwig __u16 unused; 5283dcf5451SChristoph Hellwig __u32 free_blocks_count; 5293dcf5451SChristoph Hellwig }; 5303dcf5451SChristoph Hellwig 53133afdcc5SYongqiang Yang /* Indexes used to index group tables in ext4_new_group_data */ 53233afdcc5SYongqiang Yang enum { 53333afdcc5SYongqiang Yang BLOCK_BITMAP = 0, /* block bitmap */ 53433afdcc5SYongqiang Yang INODE_BITMAP, /* inode bitmap */ 53533afdcc5SYongqiang Yang INODE_TABLE, /* inode tables */ 53633afdcc5SYongqiang Yang GROUP_TABLE_COUNT, 53733afdcc5SYongqiang Yang }; 53833afdcc5SYongqiang Yang 5393dcf5451SChristoph Hellwig /* 54079e83036SEric Sandeen * Flags used by ext4_map_blocks() 5413dcf5451SChristoph Hellwig */ 542c2177057STheodore Ts'o /* Allocate any needed blocks and/or convert an unitialized 543c2177057STheodore Ts'o extent to be an initialized ext4 */ 5442ac3b6e0STheodore Ts'o #define EXT4_GET_BLOCKS_CREATE 0x0001 545c2177057STheodore Ts'o /* Request the creation of an unitialized extent */ 5462ac3b6e0STheodore Ts'o #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 547c2177057STheodore Ts'o #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 548c2177057STheodore Ts'o EXT4_GET_BLOCKS_CREATE) 54927dd4385SLukas Czerner /* Caller is from the delayed allocation writeout path 55027dd4385SLukas Czerner * finally doing the actual allocation of delayed blocks */ 55103f5d8bcSJan Kara #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 5520031462bSMingming Cao /* caller is from the direct IO path, request to creation of an 5530031462bSMingming Cao unitialized extents if not allocated, split the uninitialized 5540031462bSMingming Cao extent if blocks has been preallocated already*/ 555c7064ef1SJiaying Zhang #define EXT4_GET_BLOCKS_PRE_IO 0x0008 5561296cc85SAneesh Kumar K.V #define EXT4_GET_BLOCKS_CONVERT 0x0010 557c7064ef1SJiaying Zhang #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 5580031462bSMingming Cao EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 559c7064ef1SJiaying Zhang /* Convert extent to initialized after IO complete */ 560c7064ef1SJiaying Zhang #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 561744692dcSJiaying Zhang EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 56227dd4385SLukas Czerner /* Eventual metadata allocation (due to growing extent tree) 56327dd4385SLukas Czerner * should not fail, so try to use reserved blocks for that.*/ 56427dd4385SLukas Czerner #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 565556b27abSVivek Haldar /* Don't normalize allocation size (used for fallocate) */ 566556b27abSVivek Haldar #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 567a4e5d88bSDmitry Monakhov /* Request will not result in inode size update (user for fallocate) */ 568a4e5d88bSDmitry Monakhov #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 569729f52c6SZheng Liu /* Do not take i_data_sem locking in ext4_map_blocks */ 570729f52c6SZheng Liu #define EXT4_GET_BLOCKS_NO_LOCK 0x0100 571d100eef2SZheng Liu /* Do not put hole in extent cache */ 572d100eef2SZheng Liu #define EXT4_GET_BLOCKS_NO_PUT_HOLE 0x0200 5733dcf5451SChristoph Hellwig 5743dcf5451SChristoph Hellwig /* 575e6362609STheodore Ts'o * Flags used by ext4_free_blocks 576e6362609STheodore Ts'o */ 577e6362609STheodore Ts'o #define EXT4_FREE_BLOCKS_METADATA 0x0001 578e6362609STheodore Ts'o #define EXT4_FREE_BLOCKS_FORGET 0x0002 5791f2acb60STheodore Ts'o #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 5807132de74SMaxim Patlasov #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 58184130193STheodore Ts'o #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 58284130193STheodore Ts'o #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 583e6362609STheodore Ts'o 584e6362609STheodore Ts'o /* 5853dcf5451SChristoph Hellwig * ioctl commands 5863dcf5451SChristoph Hellwig */ 5873dcf5451SChristoph Hellwig #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 5883dcf5451SChristoph Hellwig #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 5893dcf5451SChristoph Hellwig #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 5903dcf5451SChristoph Hellwig #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 5913dcf5451SChristoph Hellwig #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 5923dcf5451SChristoph Hellwig #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 5933dcf5451SChristoph Hellwig #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 5943dcf5451SChristoph Hellwig #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 5958eea80d5STheodore Ts'o #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 5968eea80d5STheodore Ts'o #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 5978eea80d5STheodore Ts'o #define EXT4_IOC_MIGRATE _IO('f', 9) 598ccd2506bSTheodore Ts'o /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 5998eea80d5STheodore Ts'o /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 600ccd2506bSTheodore Ts'o #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 601748de673SAkira Fujita #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 60219c5246dSYongqiang Yang #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 603393d1d1dSDr. Tilmann Bubeck #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 6043dcf5451SChristoph Hellwig 605899ad0ceSBen Hutchings #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 6063dcf5451SChristoph Hellwig /* 6073dcf5451SChristoph Hellwig * ioctl commands in 32 bit emulation 6083dcf5451SChristoph Hellwig */ 6093dcf5451SChristoph Hellwig #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 6103dcf5451SChristoph Hellwig #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 6113dcf5451SChristoph Hellwig #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 6123dcf5451SChristoph Hellwig #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 6133dcf5451SChristoph Hellwig #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 6143dcf5451SChristoph Hellwig #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 6153dcf5451SChristoph Hellwig #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 6164d92dc0fSBen Hutchings #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 6173dcf5451SChristoph Hellwig #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 6183dcf5451SChristoph Hellwig #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 619899ad0ceSBen Hutchings #endif 6203dcf5451SChristoph Hellwig 621b595076aSUwe Kleine-König /* Max physical block we can address w/o extents */ 622fb0a387dSEric Sandeen #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 623fb0a387dSEric Sandeen 6243dcf5451SChristoph Hellwig /* 6253dcf5451SChristoph Hellwig * Structure of an inode on the disk 6263dcf5451SChristoph Hellwig */ 6273dcf5451SChristoph Hellwig struct ext4_inode { 6283dcf5451SChristoph Hellwig __le16 i_mode; /* File mode */ 6293dcf5451SChristoph Hellwig __le16 i_uid; /* Low 16 bits of Owner Uid */ 6303dcf5451SChristoph Hellwig __le32 i_size_lo; /* Size in bytes */ 6313dcf5451SChristoph Hellwig __le32 i_atime; /* Access time */ 6323dcf5451SChristoph Hellwig __le32 i_ctime; /* Inode Change time */ 6333dcf5451SChristoph Hellwig __le32 i_mtime; /* Modification time */ 6343dcf5451SChristoph Hellwig __le32 i_dtime; /* Deletion Time */ 6353dcf5451SChristoph Hellwig __le16 i_gid; /* Low 16 bits of Group Id */ 6363dcf5451SChristoph Hellwig __le16 i_links_count; /* Links count */ 6373dcf5451SChristoph Hellwig __le32 i_blocks_lo; /* Blocks count */ 6383dcf5451SChristoph Hellwig __le32 i_flags; /* File flags */ 6393dcf5451SChristoph Hellwig union { 6403dcf5451SChristoph Hellwig struct { 6413dcf5451SChristoph Hellwig __le32 l_i_version; 6423dcf5451SChristoph Hellwig } linux1; 6433dcf5451SChristoph Hellwig struct { 6443dcf5451SChristoph Hellwig __u32 h_i_translator; 6453dcf5451SChristoph Hellwig } hurd1; 6463dcf5451SChristoph Hellwig struct { 6473dcf5451SChristoph Hellwig __u32 m_i_reserved1; 6483dcf5451SChristoph Hellwig } masix1; 6493dcf5451SChristoph Hellwig } osd1; /* OS dependent 1 */ 6503dcf5451SChristoph Hellwig __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 6513dcf5451SChristoph Hellwig __le32 i_generation; /* File version (for NFS) */ 6523dcf5451SChristoph Hellwig __le32 i_file_acl_lo; /* File ACL */ 6533dcf5451SChristoph Hellwig __le32 i_size_high; 6543dcf5451SChristoph Hellwig __le32 i_obso_faddr; /* Obsoleted fragment address */ 6553dcf5451SChristoph Hellwig union { 6563dcf5451SChristoph Hellwig struct { 6573dcf5451SChristoph Hellwig __le16 l_i_blocks_high; /* were l_i_reserved1 */ 6583dcf5451SChristoph Hellwig __le16 l_i_file_acl_high; 6593dcf5451SChristoph Hellwig __le16 l_i_uid_high; /* these 2 fields */ 6603dcf5451SChristoph Hellwig __le16 l_i_gid_high; /* were reserved2[0] */ 661e6153918SDarrick J. Wong __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 662e6153918SDarrick J. Wong __le16 l_i_reserved; 6633dcf5451SChristoph Hellwig } linux2; 6643dcf5451SChristoph Hellwig struct { 6653dcf5451SChristoph Hellwig __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 6663dcf5451SChristoph Hellwig __u16 h_i_mode_high; 6673dcf5451SChristoph Hellwig __u16 h_i_uid_high; 6683dcf5451SChristoph Hellwig __u16 h_i_gid_high; 6693dcf5451SChristoph Hellwig __u32 h_i_author; 6703dcf5451SChristoph Hellwig } hurd2; 6713dcf5451SChristoph Hellwig struct { 6723dcf5451SChristoph Hellwig __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 6733dcf5451SChristoph Hellwig __le16 m_i_file_acl_high; 6743dcf5451SChristoph Hellwig __u32 m_i_reserved2[2]; 6753dcf5451SChristoph Hellwig } masix2; 6763dcf5451SChristoph Hellwig } osd2; /* OS dependent 2 */ 6773dcf5451SChristoph Hellwig __le16 i_extra_isize; 678e6153918SDarrick J. Wong __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 6793dcf5451SChristoph Hellwig __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 6803dcf5451SChristoph Hellwig __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 6813dcf5451SChristoph Hellwig __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 6823dcf5451SChristoph Hellwig __le32 i_crtime; /* File Creation time */ 6833dcf5451SChristoph Hellwig __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 6843dcf5451SChristoph Hellwig __le32 i_version_hi; /* high 32 bits for 64-bit version */ 6853dcf5451SChristoph Hellwig }; 6863dcf5451SChristoph Hellwig 687748de673SAkira Fujita struct move_extent { 688748de673SAkira Fujita __u32 reserved; /* should be zero */ 689748de673SAkira Fujita __u32 donor_fd; /* donor file descriptor */ 690748de673SAkira Fujita __u64 orig_start; /* logical start offset in block for orig */ 691748de673SAkira Fujita __u64 donor_start; /* logical start offset in block for donor */ 692748de673SAkira Fujita __u64 len; /* block length to be moved */ 693748de673SAkira Fujita __u64 moved_len; /* moved block length */ 694748de673SAkira Fujita }; 6953dcf5451SChristoph Hellwig 6963dcf5451SChristoph Hellwig #define EXT4_EPOCH_BITS 2 6973dcf5451SChristoph Hellwig #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 6983dcf5451SChristoph Hellwig #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 6993dcf5451SChristoph Hellwig 7003dcf5451SChristoph Hellwig /* 7013dcf5451SChristoph Hellwig * Extended fields will fit into an inode if the filesystem was formatted 7023dcf5451SChristoph Hellwig * with large inodes (-I 256 or larger) and there are not currently any EAs 7033dcf5451SChristoph Hellwig * consuming all of the available space. For new inodes we always reserve 7043dcf5451SChristoph Hellwig * enough space for the kernel's known extended fields, but for inodes 7053dcf5451SChristoph Hellwig * created with an old kernel this might not have been the case. None of 7063dcf5451SChristoph Hellwig * the extended inode fields is critical for correct filesystem operation. 7073dcf5451SChristoph Hellwig * This macro checks if a certain field fits in the inode. Note that 7083dcf5451SChristoph Hellwig * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 7093dcf5451SChristoph Hellwig */ 7103dcf5451SChristoph Hellwig #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 7113dcf5451SChristoph Hellwig ((offsetof(typeof(*ext4_inode), field) + \ 7123dcf5451SChristoph Hellwig sizeof((ext4_inode)->field)) \ 7133dcf5451SChristoph Hellwig <= (EXT4_GOOD_OLD_INODE_SIZE + \ 7143dcf5451SChristoph Hellwig (einode)->i_extra_isize)) \ 7153dcf5451SChristoph Hellwig 7163dcf5451SChristoph Hellwig static inline __le32 ext4_encode_extra_time(struct timespec *time) 7173dcf5451SChristoph Hellwig { 7183dcf5451SChristoph Hellwig return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 719c1fccc06STheodore Ts'o (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 720c1fccc06STheodore Ts'o ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 7213dcf5451SChristoph Hellwig } 7223dcf5451SChristoph Hellwig 7233dcf5451SChristoph Hellwig static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 7243dcf5451SChristoph Hellwig { 7253dcf5451SChristoph Hellwig if (sizeof(time->tv_sec) > 4) 7263dcf5451SChristoph Hellwig time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 7273dcf5451SChristoph Hellwig << 32; 728c1fccc06STheodore Ts'o time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 7293dcf5451SChristoph Hellwig } 7303dcf5451SChristoph Hellwig 7313dcf5451SChristoph Hellwig #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 7323dcf5451SChristoph Hellwig do { \ 7333dcf5451SChristoph Hellwig (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 7343dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 7353dcf5451SChristoph Hellwig (raw_inode)->xtime ## _extra = \ 7363dcf5451SChristoph Hellwig ext4_encode_extra_time(&(inode)->xtime); \ 7373dcf5451SChristoph Hellwig } while (0) 7383dcf5451SChristoph Hellwig 7393dcf5451SChristoph Hellwig #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 7403dcf5451SChristoph Hellwig do { \ 7413dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 7423dcf5451SChristoph Hellwig (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 7433dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 7443dcf5451SChristoph Hellwig (raw_inode)->xtime ## _extra = \ 7453dcf5451SChristoph Hellwig ext4_encode_extra_time(&(einode)->xtime); \ 7463dcf5451SChristoph Hellwig } while (0) 7473dcf5451SChristoph Hellwig 7483dcf5451SChristoph Hellwig #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 7493dcf5451SChristoph Hellwig do { \ 7503dcf5451SChristoph Hellwig (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 7513dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 7523dcf5451SChristoph Hellwig ext4_decode_extra_time(&(inode)->xtime, \ 7533dcf5451SChristoph Hellwig raw_inode->xtime ## _extra); \ 754af0b44a1SEric Sandeen else \ 755af0b44a1SEric Sandeen (inode)->xtime.tv_nsec = 0; \ 7563dcf5451SChristoph Hellwig } while (0) 7573dcf5451SChristoph Hellwig 7583dcf5451SChristoph Hellwig #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 7593dcf5451SChristoph Hellwig do { \ 7603dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 7613dcf5451SChristoph Hellwig (einode)->xtime.tv_sec = \ 7623dcf5451SChristoph Hellwig (signed)le32_to_cpu((raw_inode)->xtime); \ 7633dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 7643dcf5451SChristoph Hellwig ext4_decode_extra_time(&(einode)->xtime, \ 7653dcf5451SChristoph Hellwig raw_inode->xtime ## _extra); \ 766af0b44a1SEric Sandeen else \ 767af0b44a1SEric Sandeen (einode)->xtime.tv_nsec = 0; \ 7683dcf5451SChristoph Hellwig } while (0) 7693dcf5451SChristoph Hellwig 7703dcf5451SChristoph Hellwig #define i_disk_version osd1.linux1.l_i_version 7713dcf5451SChristoph Hellwig 7723dcf5451SChristoph Hellwig #if defined(__KERNEL__) || defined(__linux__) 7733dcf5451SChristoph Hellwig #define i_reserved1 osd1.linux1.l_i_reserved1 7743dcf5451SChristoph Hellwig #define i_file_acl_high osd2.linux2.l_i_file_acl_high 7753dcf5451SChristoph Hellwig #define i_blocks_high osd2.linux2.l_i_blocks_high 7763dcf5451SChristoph Hellwig #define i_uid_low i_uid 7773dcf5451SChristoph Hellwig #define i_gid_low i_gid 7783dcf5451SChristoph Hellwig #define i_uid_high osd2.linux2.l_i_uid_high 7793dcf5451SChristoph Hellwig #define i_gid_high osd2.linux2.l_i_gid_high 780e6153918SDarrick J. Wong #define i_checksum_lo osd2.linux2.l_i_checksum_lo 7813dcf5451SChristoph Hellwig 7823dcf5451SChristoph Hellwig #elif defined(__GNU__) 7833dcf5451SChristoph Hellwig 7843dcf5451SChristoph Hellwig #define i_translator osd1.hurd1.h_i_translator 7853dcf5451SChristoph Hellwig #define i_uid_high osd2.hurd2.h_i_uid_high 7863dcf5451SChristoph Hellwig #define i_gid_high osd2.hurd2.h_i_gid_high 7873dcf5451SChristoph Hellwig #define i_author osd2.hurd2.h_i_author 7883dcf5451SChristoph Hellwig 7893dcf5451SChristoph Hellwig #elif defined(__masix__) 7903dcf5451SChristoph Hellwig 7913dcf5451SChristoph Hellwig #define i_reserved1 osd1.masix1.m_i_reserved1 7923dcf5451SChristoph Hellwig #define i_file_acl_high osd2.masix2.m_i_file_acl_high 7933dcf5451SChristoph Hellwig #define i_reserved2 osd2.masix2.m_i_reserved2 7943dcf5451SChristoph Hellwig 7953dcf5451SChristoph Hellwig #endif /* defined(__KERNEL__) || defined(__linux__) */ 7963dcf5451SChristoph Hellwig 797c0677e6dSZheng Liu #include "extents_status.h" 798c0677e6dSZheng Liu 799d444c3c3STheodore Ts'o /* 800d444c3c3STheodore Ts'o * fourth extended file system inode data in memory 801d444c3c3STheodore Ts'o */ 802d444c3c3STheodore Ts'o struct ext4_inode_info { 803d444c3c3STheodore Ts'o __le32 i_data[15]; /* unconverted */ 804d444c3c3STheodore Ts'o __u32 i_dtime; 80512e9b892SDmitry Monakhov ext4_fsblk_t i_file_acl; 806d444c3c3STheodore Ts'o 807d444c3c3STheodore Ts'o /* 808d444c3c3STheodore Ts'o * i_block_group is the number of the block group which contains 809d444c3c3STheodore Ts'o * this file's inode. Constant across the lifetime of the inode, 810d444c3c3STheodore Ts'o * it is ued for making block allocation decisions - we try to 811d444c3c3STheodore Ts'o * place a file's data blocks near its inode block, and new inodes 812d444c3c3STheodore Ts'o * near to their parent directory's inode. 813d444c3c3STheodore Ts'o */ 814d444c3c3STheodore Ts'o ext4_group_t i_block_group; 8158a2005d3STheodore Ts'o ext4_lblk_t i_dir_start_lookup; 816353eb83cSTheodore Ts'o #if (BITS_PER_LONG < 64) 81719f5fb7aSTheodore Ts'o unsigned long i_state_flags; /* Dynamic state flags */ 818353eb83cSTheodore Ts'o #endif 81912e9b892SDmitry Monakhov unsigned long i_flags; 820d444c3c3STheodore Ts'o 821d444c3c3STheodore Ts'o /* 822d444c3c3STheodore Ts'o * Extended attributes can be read independently of the main file 823d444c3c3STheodore Ts'o * data. Taking i_mutex even when reading would cause contention 824d444c3c3STheodore Ts'o * between readers of EAs and writers of regular file data, so 825d444c3c3STheodore Ts'o * instead we synchronize on xattr_sem when reading or changing 826d444c3c3STheodore Ts'o * EAs. 827d444c3c3STheodore Ts'o */ 828d444c3c3STheodore Ts'o struct rw_semaphore xattr_sem; 829d444c3c3STheodore Ts'o 830d444c3c3STheodore Ts'o struct list_head i_orphan; /* unlinked but open inodes */ 831d444c3c3STheodore Ts'o 832d444c3c3STheodore Ts'o /* 833d444c3c3STheodore Ts'o * i_disksize keeps track of what the inode size is ON DISK, not 834d444c3c3STheodore Ts'o * in memory. During truncate, i_size is set to the new size by 835d444c3c3STheodore Ts'o * the VFS prior to calling ext4_truncate(), but the filesystem won't 836d444c3c3STheodore Ts'o * set i_disksize to 0 until the truncate is actually under way. 837d444c3c3STheodore Ts'o * 838d444c3c3STheodore Ts'o * The intent is that i_disksize always represents the blocks which 839d444c3c3STheodore Ts'o * are used by this file. This allows recovery to restart truncate 840d444c3c3STheodore Ts'o * on orphans if we crash during truncate. We actually write i_disksize 841d444c3c3STheodore Ts'o * into the on-disk inode when writing inodes out, instead of i_size. 842d444c3c3STheodore Ts'o * 843d444c3c3STheodore Ts'o * The only time when i_disksize and i_size may be different is when 844d444c3c3STheodore Ts'o * a truncate is in progress. The only things which change i_disksize 845d444c3c3STheodore Ts'o * are ext4_get_block (growth) and ext4_truncate (shrinkth). 846d444c3c3STheodore Ts'o */ 847d444c3c3STheodore Ts'o loff_t i_disksize; 848d444c3c3STheodore Ts'o 849d444c3c3STheodore Ts'o /* 850d444c3c3STheodore Ts'o * i_data_sem is for serialising ext4_truncate() against 851d444c3c3STheodore Ts'o * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 852d444c3c3STheodore Ts'o * data tree are chopped off during truncate. We can't do that in 853d444c3c3STheodore Ts'o * ext4 because whenever we perform intermediate commits during 854d444c3c3STheodore Ts'o * truncate, the inode and all the metadata blocks *must* be in a 855d444c3c3STheodore Ts'o * consistent state which allows truncation of the orphans to restart 856d444c3c3STheodore Ts'o * during recovery. Hence we must fix the get_block-vs-truncate race 857d444c3c3STheodore Ts'o * by other means, so we have i_data_sem. 858d444c3c3STheodore Ts'o */ 859d444c3c3STheodore Ts'o struct rw_semaphore i_data_sem; 860d444c3c3STheodore Ts'o struct inode vfs_inode; 8618aefcd55STheodore Ts'o struct jbd2_inode *jinode; 862d444c3c3STheodore Ts'o 863d444c3c3STheodore Ts'o /* 864d444c3c3STheodore Ts'o * File creation time. Its function is same as that of 865d444c3c3STheodore Ts'o * struct timespec i_{a,c,m}time in the generic inode. 866d444c3c3STheodore Ts'o */ 867d444c3c3STheodore Ts'o struct timespec i_crtime; 868d444c3c3STheodore Ts'o 869d444c3c3STheodore Ts'o /* mballoc */ 870d444c3c3STheodore Ts'o struct list_head i_prealloc_list; 871d444c3c3STheodore Ts'o spinlock_t i_prealloc_lock; 872d444c3c3STheodore Ts'o 873c0677e6dSZheng Liu /* extents status tree */ 874c0677e6dSZheng Liu struct ext4_es_tree i_es_tree; 875c0677e6dSZheng Liu rwlock_t i_es_lock; 87674cd15cdSZheng Liu struct list_head i_es_lru; 87774cd15cdSZheng Liu unsigned int i_es_lru_nr; /* protected by i_es_lock */ 878c0677e6dSZheng Liu 879d444c3c3STheodore Ts'o /* ialloc */ 880d444c3c3STheodore Ts'o ext4_group_t i_last_alloc_group; 881d444c3c3STheodore Ts'o 882d444c3c3STheodore Ts'o /* allocation reservation info for delalloc */ 88357042651STheodore Ts'o /* In case of bigalloc, these refer to clusters rather than blocks */ 884d444c3c3STheodore Ts'o unsigned int i_reserved_data_blocks; 885d444c3c3STheodore Ts'o unsigned int i_reserved_meta_blocks; 886d444c3c3STheodore Ts'o unsigned int i_allocated_meta_blocks; 88701f49d0bSTheodore Ts'o ext4_lblk_t i_da_metadata_calc_last_lblock; 8889d0be502STheodore Ts'o int i_da_metadata_calc_len; 889d444c3c3STheodore Ts'o 890d444c3c3STheodore Ts'o /* on-disk additional length */ 891d444c3c3STheodore Ts'o __u16 i_extra_isize; 892d444c3c3STheodore Ts'o 89367cf5b09STao Ma /* Indicate the inline data space. */ 89467cf5b09STao Ma u16 i_inline_off; 89567cf5b09STao Ma u16 i_inline_size; 89667cf5b09STao Ma 897a9e7f447SDmitry Monakhov #ifdef CONFIG_QUOTA 898a9e7f447SDmitry Monakhov /* quota space reservation, managed internally by quota code */ 899a9e7f447SDmitry Monakhov qsize_t i_reserved_quota; 900a9e7f447SDmitry Monakhov #endif 9018d5d02e6SMingming Cao 902c7064ef1SJiaying Zhang /* completed IOs that might need unwritten extents handling */ 903c7064ef1SJiaying Zhang struct list_head i_completed_io_list; 904744692dcSJiaying Zhang spinlock_t i_completed_io_lock; 9058a2005d3STheodore Ts'o atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 906e27f41e1SDmitry Monakhov atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 90784c17543SJan Kara struct work_struct i_unwritten_work; /* deferred extent conversion */ 9088a2005d3STheodore Ts'o 9098a2005d3STheodore Ts'o spinlock_t i_block_reservation_lock; 910b436b9beSJan Kara 911b436b9beSJan Kara /* 912b436b9beSJan Kara * Transactions that contain inode's metadata needed to complete 913b436b9beSJan Kara * fsync and fdatasync, respectively. 914b436b9beSJan Kara */ 915b436b9beSJan Kara tid_t i_sync_tid; 916b436b9beSJan Kara tid_t i_datasync_tid; 917814525f4SDarrick J. Wong 918814525f4SDarrick J. Wong /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 919814525f4SDarrick J. Wong __u32 i_csum_seed; 920d444c3c3STheodore Ts'o }; 921d444c3c3STheodore Ts'o 922d444c3c3STheodore Ts'o /* 9233dcf5451SChristoph Hellwig * File system states 9243dcf5451SChristoph Hellwig */ 9253dcf5451SChristoph Hellwig #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 9263dcf5451SChristoph Hellwig #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 9273dcf5451SChristoph Hellwig #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 9283dcf5451SChristoph Hellwig 9293dcf5451SChristoph Hellwig /* 9303dcf5451SChristoph Hellwig * Misc. filesystem flags 9313dcf5451SChristoph Hellwig */ 9323dcf5451SChristoph Hellwig #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 9333dcf5451SChristoph Hellwig #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 9343dcf5451SChristoph Hellwig #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 9353dcf5451SChristoph Hellwig 9363dcf5451SChristoph Hellwig /* 93768911009SLukas Czerner * Mount flags set via mount options or defaults 9383dcf5451SChristoph Hellwig */ 9393dcf5451SChristoph Hellwig #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 9403dcf5451SChristoph Hellwig #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 9413dcf5451SChristoph Hellwig #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 9423dcf5451SChristoph Hellwig #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 9433dcf5451SChristoph Hellwig #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 94439ef17f1STheodore Ts'o #define EXT4_MOUNT_ERRORS_MASK 0x00070 9453dcf5451SChristoph Hellwig #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 9463dcf5451SChristoph Hellwig #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 9473dcf5451SChristoph Hellwig #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 9483dcf5451SChristoph Hellwig #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 9493dcf5451SChristoph Hellwig #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 9503dcf5451SChristoph Hellwig #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 9513dcf5451SChristoph Hellwig #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 9523dcf5451SChristoph Hellwig #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 9533dcf5451SChristoph Hellwig #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 9543dcf5451SChristoph Hellwig #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 955afd4672dSTheodore Ts'o #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 9563dcf5451SChristoph Hellwig #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 9573dcf5451SChristoph Hellwig #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 9583dcf5451SChristoph Hellwig #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 9593dcf5451SChristoph Hellwig #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 960744692dcSJiaying Zhang #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 961d4da6c9cSLinus Torvalds #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 9623dcf5451SChristoph Hellwig #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 96364769240SAlex Tomas #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 9645bf5683aSHidehiro Kawai #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 9656fd058f7STheodore Ts'o #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 9665328e635SEric Sandeen #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 967bfff6873SLukas Czerner #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 9685bf5683aSHidehiro Kawai 96968911009SLukas Czerner /* 97068911009SLukas Czerner * Mount flags set either automatically (could not be set by mount option) 97168911009SLukas Czerner * based on per file system feature or property or in special cases such as 97268911009SLukas Czerner * distinguishing between explicit mount option definition and default. 97368911009SLukas Czerner */ 97456889787STheodore Ts'o #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 97556889787STheodore Ts'o specified delalloc */ 97668911009SLukas Czerner #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 97768911009SLukas Czerner size of blocksize * 8 97868911009SLukas Czerner blocks */ 97956889787STheodore Ts'o 980fd8c37ecSTheodore Ts'o #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 981fd8c37ecSTheodore Ts'o ~EXT4_MOUNT_##opt 982fd8c37ecSTheodore Ts'o #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 983fd8c37ecSTheodore Ts'o EXT4_MOUNT_##opt 9843dcf5451SChristoph Hellwig #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 9853dcf5451SChristoph Hellwig EXT4_MOUNT_##opt) 9863dcf5451SChristoph Hellwig 987a2595b8aSTheodore Ts'o #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 988a2595b8aSTheodore Ts'o ~EXT4_MOUNT2_##opt 989a2595b8aSTheodore Ts'o #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 990a2595b8aSTheodore Ts'o EXT4_MOUNT2_##opt 991a2595b8aSTheodore Ts'o #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 992a2595b8aSTheodore Ts'o EXT4_MOUNT2_##opt) 993a2595b8aSTheodore Ts'o 994597d508cSAkinobu Mita #define ext4_test_and_set_bit __test_and_set_bit_le 995597d508cSAkinobu Mita #define ext4_set_bit __set_bit_le 9963dcf5451SChristoph Hellwig #define ext4_set_bit_atomic ext2_set_bit_atomic 997597d508cSAkinobu Mita #define ext4_test_and_clear_bit __test_and_clear_bit_le 998597d508cSAkinobu Mita #define ext4_clear_bit __clear_bit_le 9993dcf5451SChristoph Hellwig #define ext4_clear_bit_atomic ext2_clear_bit_atomic 100050e0168cSAkinobu Mita #define ext4_test_bit test_bit_le 100150e0168cSAkinobu Mita #define ext4_find_next_zero_bit find_next_zero_bit_le 100250e0168cSAkinobu Mita #define ext4_find_next_bit find_next_bit_le 10033dcf5451SChristoph Hellwig 1004c3e94d1dSYongqiang Yang extern void ext4_set_bits(void *bm, int cur, int len); 1005c3e94d1dSYongqiang Yang 10063dcf5451SChristoph Hellwig /* 10073dcf5451SChristoph Hellwig * Maximal mount counts between two filesystem checks 10083dcf5451SChristoph Hellwig */ 10093dcf5451SChristoph Hellwig #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 10103dcf5451SChristoph Hellwig #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 10113dcf5451SChristoph Hellwig 10123dcf5451SChristoph Hellwig /* 10133dcf5451SChristoph Hellwig * Behaviour when detecting errors 10143dcf5451SChristoph Hellwig */ 10153dcf5451SChristoph Hellwig #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 10163dcf5451SChristoph Hellwig #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 10173dcf5451SChristoph Hellwig #define EXT4_ERRORS_PANIC 3 /* Panic */ 10183dcf5451SChristoph Hellwig #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 10193dcf5451SChristoph Hellwig 1020e6153918SDarrick J. Wong /* Metadata checksum algorithm codes */ 1021e6153918SDarrick J. Wong #define EXT4_CRC32C_CHKSUM 1 1022e6153918SDarrick J. Wong 10233dcf5451SChristoph Hellwig /* 10243dcf5451SChristoph Hellwig * Structure of the super block 10253dcf5451SChristoph Hellwig */ 10263dcf5451SChristoph Hellwig struct ext4_super_block { 10273dcf5451SChristoph Hellwig /*00*/ __le32 s_inodes_count; /* Inodes count */ 10283dcf5451SChristoph Hellwig __le32 s_blocks_count_lo; /* Blocks count */ 10293dcf5451SChristoph Hellwig __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 10303dcf5451SChristoph Hellwig __le32 s_free_blocks_count_lo; /* Free blocks count */ 10313dcf5451SChristoph Hellwig /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 10323dcf5451SChristoph Hellwig __le32 s_first_data_block; /* First Data Block */ 10333dcf5451SChristoph Hellwig __le32 s_log_block_size; /* Block size */ 1034281b5995STheodore Ts'o __le32 s_log_cluster_size; /* Allocation cluster size */ 10353dcf5451SChristoph Hellwig /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1036281b5995STheodore Ts'o __le32 s_clusters_per_group; /* # Clusters per group */ 10373dcf5451SChristoph Hellwig __le32 s_inodes_per_group; /* # Inodes per group */ 10383dcf5451SChristoph Hellwig __le32 s_mtime; /* Mount time */ 10393dcf5451SChristoph Hellwig /*30*/ __le32 s_wtime; /* Write time */ 10403dcf5451SChristoph Hellwig __le16 s_mnt_count; /* Mount count */ 10413dcf5451SChristoph Hellwig __le16 s_max_mnt_count; /* Maximal mount count */ 10423dcf5451SChristoph Hellwig __le16 s_magic; /* Magic signature */ 10433dcf5451SChristoph Hellwig __le16 s_state; /* File system state */ 10443dcf5451SChristoph Hellwig __le16 s_errors; /* Behaviour when detecting errors */ 10453dcf5451SChristoph Hellwig __le16 s_minor_rev_level; /* minor revision level */ 10463dcf5451SChristoph Hellwig /*40*/ __le32 s_lastcheck; /* time of last check */ 10473dcf5451SChristoph Hellwig __le32 s_checkinterval; /* max. time between checks */ 10483dcf5451SChristoph Hellwig __le32 s_creator_os; /* OS */ 10493dcf5451SChristoph Hellwig __le32 s_rev_level; /* Revision level */ 10503dcf5451SChristoph Hellwig /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 10513dcf5451SChristoph Hellwig __le16 s_def_resgid; /* Default gid for reserved blocks */ 10523dcf5451SChristoph Hellwig /* 10533dcf5451SChristoph Hellwig * These fields are for EXT4_DYNAMIC_REV superblocks only. 10543dcf5451SChristoph Hellwig * 10553dcf5451SChristoph Hellwig * Note: the difference between the compatible feature set and 10563dcf5451SChristoph Hellwig * the incompatible feature set is that if there is a bit set 10573dcf5451SChristoph Hellwig * in the incompatible feature set that the kernel doesn't 10583dcf5451SChristoph Hellwig * know about, it should refuse to mount the filesystem. 10593dcf5451SChristoph Hellwig * 10603dcf5451SChristoph Hellwig * e2fsck's requirements are more strict; if it doesn't know 10613dcf5451SChristoph Hellwig * about a feature in either the compatible or incompatible 10623dcf5451SChristoph Hellwig * feature set, it must abort and not try to meddle with 10633dcf5451SChristoph Hellwig * things it doesn't understand... 10643dcf5451SChristoph Hellwig */ 10653dcf5451SChristoph Hellwig __le32 s_first_ino; /* First non-reserved inode */ 10663dcf5451SChristoph Hellwig __le16 s_inode_size; /* size of inode structure */ 10673dcf5451SChristoph Hellwig __le16 s_block_group_nr; /* block group # of this superblock */ 10683dcf5451SChristoph Hellwig __le32 s_feature_compat; /* compatible feature set */ 10693dcf5451SChristoph Hellwig /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 10703dcf5451SChristoph Hellwig __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 10713dcf5451SChristoph Hellwig /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 10723dcf5451SChristoph Hellwig /*78*/ char s_volume_name[16]; /* volume name */ 10733dcf5451SChristoph Hellwig /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 10743dcf5451SChristoph Hellwig /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 10753dcf5451SChristoph Hellwig /* 10763dcf5451SChristoph Hellwig * Performance hints. Directory preallocation should only 10773dcf5451SChristoph Hellwig * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 10783dcf5451SChristoph Hellwig */ 10793dcf5451SChristoph Hellwig __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 10803dcf5451SChristoph Hellwig __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 10813dcf5451SChristoph Hellwig __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 10823dcf5451SChristoph Hellwig /* 10833dcf5451SChristoph Hellwig * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 10843dcf5451SChristoph Hellwig */ 10853dcf5451SChristoph Hellwig /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 10863dcf5451SChristoph Hellwig /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 10873dcf5451SChristoph Hellwig __le32 s_journal_dev; /* device number of journal file */ 10883dcf5451SChristoph Hellwig __le32 s_last_orphan; /* start of list of inodes to delete */ 10893dcf5451SChristoph Hellwig __le32 s_hash_seed[4]; /* HTREE hash seed */ 10903dcf5451SChristoph Hellwig __u8 s_def_hash_version; /* Default hash version to use */ 109189eeddf0STheodore Ts'o __u8 s_jnl_backup_type; 10923dcf5451SChristoph Hellwig __le16 s_desc_size; /* size of group descriptor */ 10933dcf5451SChristoph Hellwig /*100*/ __le32 s_default_mount_opts; 10943dcf5451SChristoph Hellwig __le32 s_first_meta_bg; /* First metablock block group */ 10953dcf5451SChristoph Hellwig __le32 s_mkfs_time; /* When the filesystem was created */ 10963dcf5451SChristoph Hellwig __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 10973dcf5451SChristoph Hellwig /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 10983dcf5451SChristoph Hellwig /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 10993dcf5451SChristoph Hellwig __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 11003dcf5451SChristoph Hellwig __le32 s_free_blocks_count_hi; /* Free blocks count */ 11013dcf5451SChristoph Hellwig __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 11023dcf5451SChristoph Hellwig __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 11033dcf5451SChristoph Hellwig __le32 s_flags; /* Miscellaneous flags */ 11043dcf5451SChristoph Hellwig __le16 s_raid_stride; /* RAID stride */ 1105c5e06d10SJohann Lombardi __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 11063dcf5451SChristoph Hellwig __le64 s_mmp_block; /* Block for multi-mount protection */ 11073dcf5451SChristoph Hellwig __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1108772cb7c8SJose R. Santos __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1109e6153918SDarrick J. Wong __u8 s_checksum_type; /* metadata checksum algorithm used */ 1110772cb7c8SJose R. Santos __le16 s_reserved_pad; 1111afc32f7eSTheodore Ts'o __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 11124a9cdec7STheodore Ts'o __le32 s_snapshot_inum; /* Inode number of active snapshot */ 11134a9cdec7STheodore Ts'o __le32 s_snapshot_id; /* sequential ID of active snapshot */ 11144a9cdec7STheodore Ts'o __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 11154a9cdec7STheodore Ts'o snapshot's future use */ 11164a9cdec7STheodore Ts'o __le32 s_snapshot_list; /* inode number of the head of the 11174a9cdec7STheodore Ts'o on-disk snapshot list */ 11181c13d5c0STheodore Ts'o #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 11191c13d5c0STheodore Ts'o __le32 s_error_count; /* number of fs errors */ 11201c13d5c0STheodore Ts'o __le32 s_first_error_time; /* first time an error happened */ 11211c13d5c0STheodore Ts'o __le32 s_first_error_ino; /* inode involved in first error */ 11221c13d5c0STheodore Ts'o __le64 s_first_error_block; /* block involved of first error */ 11231c13d5c0STheodore Ts'o __u8 s_first_error_func[32]; /* function where the error happened */ 11241c13d5c0STheodore Ts'o __le32 s_first_error_line; /* line number where error happened */ 11251c13d5c0STheodore Ts'o __le32 s_last_error_time; /* most recent time of an error */ 11261c13d5c0STheodore Ts'o __le32 s_last_error_ino; /* inode involved in last error */ 11271c13d5c0STheodore Ts'o __le32 s_last_error_line; /* line number where error happened */ 11281c13d5c0STheodore Ts'o __le64 s_last_error_block; /* block involved of last error */ 11291c13d5c0STheodore Ts'o __u8 s_last_error_func[32]; /* function where the error happened */ 11308b67f04aSTheodore Ts'o #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 11318b67f04aSTheodore Ts'o __u8 s_mount_opts[64]; 1132281b5995STheodore Ts'o __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1133281b5995STheodore Ts'o __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1134281b5995STheodore Ts'o __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1135e6153918SDarrick J. Wong __le32 s_reserved[108]; /* Padding to the end of the block */ 1136e6153918SDarrick J. Wong __le32 s_checksum; /* crc32c(superblock) */ 11373dcf5451SChristoph Hellwig }; 11383dcf5451SChristoph Hellwig 11391c13d5c0STheodore Ts'o #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 11401c13d5c0STheodore Ts'o 11413dcf5451SChristoph Hellwig #ifdef __KERNEL__ 1142bc0b0d6dSTheodore Ts'o 1143bc0b0d6dSTheodore Ts'o /* 11444ab2f15bSTheodore Ts'o * run-time mount flags 1145bc0b0d6dSTheodore Ts'o */ 1146bc0b0d6dSTheodore Ts'o #define EXT4_MF_MNTDIR_SAMPLED 0x0001 11474ab2f15bSTheodore Ts'o #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1148bc0b0d6dSTheodore Ts'o 1149ca0faba0STheodore Ts'o /* 1150ca0faba0STheodore Ts'o * fourth extended-fs super-block data in memory 1151ca0faba0STheodore Ts'o */ 1152ca0faba0STheodore Ts'o struct ext4_sb_info { 1153ca0faba0STheodore Ts'o unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1154ca0faba0STheodore Ts'o unsigned long s_inodes_per_block;/* Number of inodes per block */ 1155ca0faba0STheodore Ts'o unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1156281b5995STheodore Ts'o unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1157ca0faba0STheodore Ts'o unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1158ca0faba0STheodore Ts'o unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1159ca0faba0STheodore Ts'o unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1160ca0faba0STheodore Ts'o unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1161ca0faba0STheodore Ts'o ext4_group_t s_groups_count; /* Number of groups in the fs */ 1162fb0a387dSEric Sandeen ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1163952fc18eSTheodore Ts'o unsigned long s_overhead; /* # of fs overhead clusters */ 1164281b5995STheodore Ts'o unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1165281b5995STheodore Ts'o unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1166ca0faba0STheodore Ts'o loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1167ca0faba0STheodore Ts'o struct buffer_head * s_sbh; /* Buffer containing the super block */ 1168ca0faba0STheodore Ts'o struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1169ca0faba0STheodore Ts'o struct buffer_head **s_group_desc; 11707f4520ccSTheodore Ts'o unsigned int s_mount_opt; 1171a2595b8aSTheodore Ts'o unsigned int s_mount_opt2; 1172bc0b0d6dSTheodore Ts'o unsigned int s_mount_flags; 11735a916be1STheodore Ts'o unsigned int s_def_mount_opt; 1174ca0faba0STheodore Ts'o ext4_fsblk_t s_sb_block; 117527dd4385SLukas Czerner atomic64_t s_resv_clusters; 117608cefc7aSEric W. Biederman kuid_t s_resuid; 117708cefc7aSEric W. Biederman kgid_t s_resgid; 1178ca0faba0STheodore Ts'o unsigned short s_mount_state; 1179ca0faba0STheodore Ts'o unsigned short s_pad; 1180ca0faba0STheodore Ts'o int s_addr_per_block_bits; 1181ca0faba0STheodore Ts'o int s_desc_per_block_bits; 1182ca0faba0STheodore Ts'o int s_inode_size; 1183ca0faba0STheodore Ts'o int s_first_ino; 1184ca0faba0STheodore Ts'o unsigned int s_inode_readahead_blks; 118511013911SAndreas Dilger unsigned int s_inode_goal; 1186ca0faba0STheodore Ts'o spinlock_t s_next_gen_lock; 1187ca0faba0STheodore Ts'o u32 s_next_generation; 1188ca0faba0STheodore Ts'o u32 s_hash_seed[4]; 1189ca0faba0STheodore Ts'o int s_def_hash_version; 1190ca0faba0STheodore Ts'o int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 119157042651STheodore Ts'o struct percpu_counter s_freeclusters_counter; 1192ca0faba0STheodore Ts'o struct percpu_counter s_freeinodes_counter; 1193ca0faba0STheodore Ts'o struct percpu_counter s_dirs_counter; 119457042651STheodore Ts'o struct percpu_counter s_dirtyclusters_counter; 1195ca0faba0STheodore Ts'o struct blockgroup_lock *s_blockgroup_lock; 1196ca0faba0STheodore Ts'o struct proc_dir_entry *s_proc; 1197ca0faba0STheodore Ts'o struct kobject s_kobj; 1198ca0faba0STheodore Ts'o struct completion s_kobj_unregister; 11992c0544b2STheodore Ts'o struct super_block *s_sb; 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; 123428623c2fSTheodore Ts'o unsigned int s_group_info_size; 1235ca0faba0STheodore Ts'o 1236ca0faba0STheodore Ts'o /* tunables */ 1237ca0faba0STheodore Ts'o unsigned long s_stripe; 1238ca0faba0STheodore Ts'o unsigned int s_mb_stream_request; 1239ca0faba0STheodore Ts'o unsigned int s_mb_max_to_scan; 1240ca0faba0STheodore Ts'o unsigned int s_mb_min_to_scan; 1241ca0faba0STheodore Ts'o unsigned int s_mb_stats; 1242ca0faba0STheodore Ts'o unsigned int s_mb_order2_reqs; 1243ca0faba0STheodore Ts'o unsigned int s_mb_group_prealloc; 1244df981d03STheodore Ts'o unsigned int s_max_dir_size_kb; 1245ca0faba0STheodore Ts'o /* where last allocation was done - for stream allocation */ 1246ca0faba0STheodore Ts'o unsigned long s_mb_last_group; 1247ca0faba0STheodore Ts'o unsigned long s_mb_last_start; 1248ca0faba0STheodore Ts'o 1249ca0faba0STheodore Ts'o /* stats for buddy allocator */ 1250ca0faba0STheodore Ts'o atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1251ca0faba0STheodore Ts'o atomic_t s_bal_success; /* we found long enough chunks */ 1252ca0faba0STheodore Ts'o atomic_t s_bal_allocated; /* in blocks */ 1253ca0faba0STheodore Ts'o atomic_t s_bal_ex_scanned; /* total extents scanned */ 1254ca0faba0STheodore Ts'o atomic_t s_bal_goals; /* goal hits */ 1255ca0faba0STheodore Ts'o atomic_t s_bal_breaks; /* too long searches */ 1256ca0faba0STheodore Ts'o atomic_t s_bal_2orders; /* 2^order hits */ 1257ca0faba0STheodore Ts'o spinlock_t s_bal_lock; 1258ca0faba0STheodore Ts'o unsigned long s_mb_buddies_generated; 1259ca0faba0STheodore Ts'o unsigned long long s_mb_generation_time; 1260ca0faba0STheodore Ts'o atomic_t s_mb_lost_chunks; 1261ca0faba0STheodore Ts'o atomic_t s_mb_preallocated; 1262ca0faba0STheodore Ts'o atomic_t s_mb_discarded; 126350797481STheodore Ts'o atomic_t s_lock_busy; 1264ca0faba0STheodore Ts'o 1265ca0faba0STheodore Ts'o /* locality groups */ 1266003cb608STejun Heo struct ext4_locality_group __percpu *s_locality_groups; 1267ca0faba0STheodore Ts'o 1268ca0faba0STheodore Ts'o /* for write statistics */ 1269ca0faba0STheodore Ts'o unsigned long s_sectors_written_start; 1270ca0faba0STheodore Ts'o u64 s_kbytes_written; 1271ca0faba0STheodore Ts'o 127267a5da56SZheng Liu /* the size of zero-out chunk */ 127367a5da56SZheng Liu unsigned int s_extent_max_zeroout_kb; 127467a5da56SZheng Liu 1275ca0faba0STheodore Ts'o unsigned int s_log_groups_per_flex; 1276ca0faba0STheodore Ts'o struct flex_groups *s_flex_groups; 1277117fff10STheodore Ts'o ext4_group_t s_flex_groups_allocated; 12784c0425ffSMingming Cao 12794c0425ffSMingming Cao /* workqueue for dio unwritten */ 12804c0425ffSMingming Cao struct workqueue_struct *dio_unwritten_wq; 128166e61a9eSTheodore Ts'o 128266e61a9eSTheodore Ts'o /* timer for periodic error stats printing */ 128366e61a9eSTheodore Ts'o struct timer_list s_err_report; 1284bfff6873SLukas Czerner 1285bfff6873SLukas Czerner /* Lazy inode table initialization info */ 1286bfff6873SLukas Czerner struct ext4_li_request *s_li_request; 1287bfff6873SLukas Czerner /* Wait multiplier for lazy initialization thread */ 1288bfff6873SLukas Czerner unsigned int s_li_wait_mult; 1289c5e06d10SJohann Lombardi 1290c5e06d10SJohann Lombardi /* Kernel thread for multiple mount protection */ 1291c5e06d10SJohann Lombardi struct task_struct *s_mmp_tsk; 12923d56b8d2STao Ma 12933d56b8d2STao Ma /* record the last minlen when FITRIM is called. */ 12943d56b8d2STao Ma atomic_t s_last_trim_minblks; 12950441984aSDarrick J. Wong 12960441984aSDarrick J. Wong /* Reference to checksum algorithm driver via cryptoapi */ 12970441984aSDarrick J. Wong struct crypto_shash *s_chksum_driver; 1298a9c47317SDarrick J. Wong 1299a9c47317SDarrick J. Wong /* Precomputed FS UUID checksum for seeding other checksums */ 1300a9c47317SDarrick J. Wong __u32 s_csum_seed; 130174cd15cdSZheng Liu 130274cd15cdSZheng Liu /* Reclaim extents from extent status tree */ 130374cd15cdSZheng Liu struct shrinker s_es_shrinker; 130474cd15cdSZheng Liu struct list_head s_es_lru; 13051ac6466fSTheodore Ts'o struct percpu_counter s_extent_cache_cnt; 130674cd15cdSZheng Liu spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp; 1307ca0faba0STheodore Ts'o }; 1308ca0faba0STheodore Ts'o 13093dcf5451SChristoph Hellwig static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 13103dcf5451SChristoph Hellwig { 13113dcf5451SChristoph Hellwig return sb->s_fs_info; 13123dcf5451SChristoph Hellwig } 13133dcf5451SChristoph Hellwig static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 13143dcf5451SChristoph Hellwig { 13153dcf5451SChristoph Hellwig return container_of(inode, struct ext4_inode_info, vfs_inode); 13163dcf5451SChristoph Hellwig } 13173dcf5451SChristoph Hellwig 13183dcf5451SChristoph Hellwig static inline struct timespec ext4_current_time(struct inode *inode) 13193dcf5451SChristoph Hellwig { 13203dcf5451SChristoph Hellwig return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 13213dcf5451SChristoph Hellwig current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 13223dcf5451SChristoph Hellwig } 13233dcf5451SChristoph Hellwig 13243dcf5451SChristoph Hellwig static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 13253dcf5451SChristoph Hellwig { 13263dcf5451SChristoph Hellwig return ino == EXT4_ROOT_INO || 13277c319d32SAditya Kali ino == EXT4_USR_QUOTA_INO || 13287c319d32SAditya Kali ino == EXT4_GRP_QUOTA_INO || 1329393d1d1dSDr. Tilmann Bubeck ino == EXT4_BOOT_LOADER_INO || 13303dcf5451SChristoph Hellwig ino == EXT4_JOURNAL_INO || 13313dcf5451SChristoph Hellwig ino == EXT4_RESIZE_INO || 13323dcf5451SChristoph Hellwig (ino >= EXT4_FIRST_INO(sb) && 13333dcf5451SChristoph Hellwig ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 13343dcf5451SChristoph Hellwig } 133519f5fb7aSTheodore Ts'o 13360edeb71dSTao Ma static inline void ext4_set_io_unwritten_flag(struct inode *inode, 13370edeb71dSTao Ma struct ext4_io_end *io_end) 13380edeb71dSTao Ma { 13390edeb71dSTao Ma if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 13400edeb71dSTao Ma io_end->flag |= EXT4_IO_END_UNWRITTEN; 1341e27f41e1SDmitry Monakhov atomic_inc(&EXT4_I(inode)->i_unwritten); 13420edeb71dSTao Ma } 13430edeb71dSTao Ma } 13440edeb71dSTao Ma 1345f45ee3a1SDmitry Monakhov static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) 1346f45ee3a1SDmitry Monakhov { 1347f45ee3a1SDmitry Monakhov return inode->i_private; 1348f45ee3a1SDmitry Monakhov } 1349f45ee3a1SDmitry Monakhov 1350f45ee3a1SDmitry Monakhov static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io) 1351f45ee3a1SDmitry Monakhov { 1352f45ee3a1SDmitry Monakhov inode->i_private = io; 1353f45ee3a1SDmitry Monakhov } 1354f45ee3a1SDmitry Monakhov 135519f5fb7aSTheodore Ts'o /* 135619f5fb7aSTheodore Ts'o * Inode dynamic state flags 135719f5fb7aSTheodore Ts'o */ 135819f5fb7aSTheodore Ts'o enum { 135919f5fb7aSTheodore Ts'o EXT4_STATE_JDATA, /* journaled data exists */ 136019f5fb7aSTheodore Ts'o EXT4_STATE_NEW, /* inode is newly created */ 136119f5fb7aSTheodore Ts'o EXT4_STATE_XATTR, /* has in-inode xattrs */ 136219f5fb7aSTheodore Ts'o EXT4_STATE_NO_EXPAND, /* No space for expansion */ 136319f5fb7aSTheodore Ts'o EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 136419f5fb7aSTheodore Ts'o EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 136519f5fb7aSTheodore Ts'o EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 136614ece102SFrank Mayhar EXT4_STATE_NEWENTRY, /* File just added to dir */ 1367f2321097STheodore Ts'o EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */ 136817335dccSDmitry Monakhov EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 136917335dccSDmitry Monakhov nolocking */ 137067cf5b09STao Ma EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 137174d553aaSTheodore Ts'o EXT4_STATE_ORDERED_MODE, /* data=ordered mode */ 137219f5fb7aSTheodore Ts'o }; 137319f5fb7aSTheodore Ts'o 1374353eb83cSTheodore Ts'o #define EXT4_INODE_BIT_FNS(name, field, offset) \ 137512e9b892SDmitry Monakhov static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 137612e9b892SDmitry Monakhov { \ 1377353eb83cSTheodore Ts'o return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 137812e9b892SDmitry Monakhov } \ 137912e9b892SDmitry Monakhov static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 138012e9b892SDmitry Monakhov { \ 1381353eb83cSTheodore Ts'o set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 138212e9b892SDmitry Monakhov } \ 138312e9b892SDmitry Monakhov static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 138412e9b892SDmitry Monakhov { \ 1385353eb83cSTheodore Ts'o clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 138619f5fb7aSTheodore Ts'o } 138719f5fb7aSTheodore Ts'o 1388353eb83cSTheodore Ts'o EXT4_INODE_BIT_FNS(flag, flags, 0) 1389353eb83cSTheodore Ts'o #if (BITS_PER_LONG < 64) 1390353eb83cSTheodore Ts'o EXT4_INODE_BIT_FNS(state, state_flags, 0) 1391353eb83cSTheodore Ts'o 1392353eb83cSTheodore Ts'o static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1393353eb83cSTheodore Ts'o { 1394353eb83cSTheodore Ts'o (ei)->i_state_flags = 0; 1395353eb83cSTheodore Ts'o } 1396353eb83cSTheodore Ts'o #else 1397353eb83cSTheodore Ts'o EXT4_INODE_BIT_FNS(state, flags, 32) 1398353eb83cSTheodore Ts'o 1399353eb83cSTheodore Ts'o static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1400353eb83cSTheodore Ts'o { 1401353eb83cSTheodore Ts'o /* We depend on the fact that callers will set i_flags */ 1402353eb83cSTheodore Ts'o } 1403353eb83cSTheodore Ts'o #endif 14043dcf5451SChristoph Hellwig #else 14053dcf5451SChristoph Hellwig /* Assume that user mode programs are passing in an ext4fs superblock, not 14063dcf5451SChristoph Hellwig * a kernel struct super_block. This will allow us to call the feature-test 14073dcf5451SChristoph Hellwig * macros from user land. */ 14083dcf5451SChristoph Hellwig #define EXT4_SB(sb) (sb) 14093dcf5451SChristoph Hellwig #endif 14103dcf5451SChristoph Hellwig 14113dcf5451SChristoph Hellwig #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 14123dcf5451SChristoph Hellwig 14133dcf5451SChristoph Hellwig /* 14143dcf5451SChristoph Hellwig * Codes for operating systems 14153dcf5451SChristoph Hellwig */ 14163dcf5451SChristoph Hellwig #define EXT4_OS_LINUX 0 14173dcf5451SChristoph Hellwig #define EXT4_OS_HURD 1 14183dcf5451SChristoph Hellwig #define EXT4_OS_MASIX 2 14193dcf5451SChristoph Hellwig #define EXT4_OS_FREEBSD 3 14203dcf5451SChristoph Hellwig #define EXT4_OS_LITES 4 14213dcf5451SChristoph Hellwig 14223dcf5451SChristoph Hellwig /* 14233dcf5451SChristoph Hellwig * Revision levels 14243dcf5451SChristoph Hellwig */ 14253dcf5451SChristoph Hellwig #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 14263dcf5451SChristoph Hellwig #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 14273dcf5451SChristoph Hellwig 14283dcf5451SChristoph Hellwig #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 14293dcf5451SChristoph Hellwig #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 14303dcf5451SChristoph Hellwig 14313dcf5451SChristoph Hellwig #define EXT4_GOOD_OLD_INODE_SIZE 128 14323dcf5451SChristoph Hellwig 14333dcf5451SChristoph Hellwig /* 14343dcf5451SChristoph Hellwig * Feature set definitions 14353dcf5451SChristoph Hellwig */ 14363dcf5451SChristoph Hellwig 14373dcf5451SChristoph Hellwig #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 14383a06d778SAneesh Kumar K.V ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 14393dcf5451SChristoph Hellwig #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 14403a06d778SAneesh Kumar K.V ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 14413dcf5451SChristoph Hellwig #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 14423a06d778SAneesh Kumar K.V ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 14433dcf5451SChristoph Hellwig #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 14443dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 14453dcf5451SChristoph Hellwig #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 14463dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 14473dcf5451SChristoph Hellwig #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 14483dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 14493dcf5451SChristoph Hellwig #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 14503dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 14513dcf5451SChristoph Hellwig #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 14523dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 14533dcf5451SChristoph Hellwig #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 14543dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 14553dcf5451SChristoph Hellwig 14563dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 14573dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 14583dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 14593dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 14603dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 14613dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 14623dcf5451SChristoph Hellwig 14633dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 14643dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 14653dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 14663dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 14673dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 14683dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 14693dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1470ae812306SAditya Kali #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1471281b5995STheodore Ts'o #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1472e6153918SDarrick J. Wong /* 1473e6153918SDarrick J. Wong * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1474e6153918SDarrick J. Wong * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1475e6153918SDarrick J. Wong * all other data structures' checksums. However, the METADATA_CSUM and 1476e6153918SDarrick J. Wong * GDT_CSUM bits are mutually exclusive. 1477e6153918SDarrick J. Wong */ 14789b90e5e0STheodore Ts'o #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 14793dcf5451SChristoph Hellwig 14803dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 14813dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 14823dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 14833dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 14843dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 14853dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 14863dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 14873dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 14883dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1489f710b4b9STheodore Ts'o #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1490f710b4b9STheodore Ts'o #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1491856cbcf9STheodore Ts'o #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ 14929b90e5e0STheodore Ts'o #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 149367cf5b09STao Ma #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 14943dcf5451SChristoph Hellwig 14952035e776STheodore Ts'o #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 14962035e776STheodore Ts'o #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 14972035e776STheodore Ts'o EXT4_FEATURE_INCOMPAT_META_BG) 14982035e776STheodore Ts'o #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 14992035e776STheodore Ts'o EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 15002035e776STheodore Ts'o EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 15012035e776STheodore Ts'o 15022035e776STheodore Ts'o #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 15032035e776STheodore Ts'o #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 15042035e776STheodore Ts'o EXT4_FEATURE_INCOMPAT_RECOVER| \ 15052035e776STheodore Ts'o EXT4_FEATURE_INCOMPAT_META_BG) 15062035e776STheodore Ts'o #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 15072035e776STheodore Ts'o EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 15082035e776STheodore Ts'o EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 15092035e776STheodore Ts'o 15103dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 15113dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 15123dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_RECOVER| \ 15133dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_META_BG| \ 15143dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_EXTENTS| \ 15153dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_64BIT| \ 1516c5e06d10SJohann Lombardi EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1517f08225d1STao Ma EXT4_FEATURE_INCOMPAT_MMP | \ 1518f08225d1STao Ma EXT4_FEATURE_INCOMPAT_INLINE_DATA) 15193dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 15203dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 15213dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 15223dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 15233dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 15243dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 15256f16b606STheodore Ts'o EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1526e93376c2SDarrick J. Wong EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 15277c319d32SAditya Kali EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 15287c319d32SAditya Kali EXT4_FEATURE_RO_COMPAT_QUOTA) 15293dcf5451SChristoph Hellwig 15303dcf5451SChristoph Hellwig /* 15313dcf5451SChristoph Hellwig * Default values for user and/or group using reserved blocks 15323dcf5451SChristoph Hellwig */ 15333dcf5451SChristoph Hellwig #define EXT4_DEF_RESUID 0 15343dcf5451SChristoph Hellwig #define EXT4_DEF_RESGID 0 15353dcf5451SChristoph Hellwig 1536240799cdSTheodore Ts'o #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1537240799cdSTheodore Ts'o 15383dcf5451SChristoph Hellwig /* 15393dcf5451SChristoph Hellwig * Default mount options 15403dcf5451SChristoph Hellwig */ 15413dcf5451SChristoph Hellwig #define EXT4_DEFM_DEBUG 0x0001 15423dcf5451SChristoph Hellwig #define EXT4_DEFM_BSDGROUPS 0x0002 15433dcf5451SChristoph Hellwig #define EXT4_DEFM_XATTR_USER 0x0004 15443dcf5451SChristoph Hellwig #define EXT4_DEFM_ACL 0x0008 15453dcf5451SChristoph Hellwig #define EXT4_DEFM_UID16 0x0010 15463dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE 0x0060 15473dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE_DATA 0x0020 15483dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE_ORDERED 0x0040 15493dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE_WBACK 0x0060 15508b67f04aSTheodore Ts'o #define EXT4_DEFM_NOBARRIER 0x0100 15518b67f04aSTheodore Ts'o #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 15528b67f04aSTheodore Ts'o #define EXT4_DEFM_DISCARD 0x0400 15538b67f04aSTheodore Ts'o #define EXT4_DEFM_NODELALLOC 0x0800 15543dcf5451SChristoph Hellwig 15553dcf5451SChristoph Hellwig /* 155630773840STheodore Ts'o * Default journal batch times 155730773840STheodore Ts'o */ 155830773840STheodore Ts'o #define EXT4_DEF_MIN_BATCH_TIME 0 155930773840STheodore Ts'o #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 156030773840STheodore Ts'o 156130773840STheodore Ts'o /* 1562a4912123STheodore Ts'o * Minimum number of groups in a flexgroup before we separate out 1563a4912123STheodore Ts'o * directories into the first block group of a flexgroup 1564a4912123STheodore Ts'o */ 1565a4912123STheodore Ts'o #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1566a4912123STheodore Ts'o 1567a4912123STheodore Ts'o /* 15683dcf5451SChristoph Hellwig * Structure of a directory entry 15693dcf5451SChristoph Hellwig */ 15703dcf5451SChristoph Hellwig #define EXT4_NAME_LEN 255 15713dcf5451SChristoph Hellwig 15723dcf5451SChristoph Hellwig struct ext4_dir_entry { 15733dcf5451SChristoph Hellwig __le32 inode; /* Inode number */ 15743dcf5451SChristoph Hellwig __le16 rec_len; /* Directory entry length */ 15753dcf5451SChristoph Hellwig __le16 name_len; /* Name length */ 15763dcf5451SChristoph Hellwig char name[EXT4_NAME_LEN]; /* File name */ 15773dcf5451SChristoph Hellwig }; 15783dcf5451SChristoph Hellwig 15793dcf5451SChristoph Hellwig /* 15803dcf5451SChristoph Hellwig * The new version of the directory entry. Since EXT4 structures are 15813dcf5451SChristoph Hellwig * stored in intel byte order, and the name_len field could never be 15823dcf5451SChristoph Hellwig * bigger than 255 chars, it's safe to reclaim the extra byte for the 15833dcf5451SChristoph Hellwig * file_type field. 15843dcf5451SChristoph Hellwig */ 15853dcf5451SChristoph Hellwig struct ext4_dir_entry_2 { 15863dcf5451SChristoph Hellwig __le32 inode; /* Inode number */ 15873dcf5451SChristoph Hellwig __le16 rec_len; /* Directory entry length */ 15883dcf5451SChristoph Hellwig __u8 name_len; /* Name length */ 15893dcf5451SChristoph Hellwig __u8 file_type; 15903dcf5451SChristoph Hellwig char name[EXT4_NAME_LEN]; /* File name */ 15913dcf5451SChristoph Hellwig }; 15923dcf5451SChristoph Hellwig 15933dcf5451SChristoph Hellwig /* 1594e6153918SDarrick J. Wong * This is a bogus directory entry at the end of each leaf block that 1595e6153918SDarrick J. Wong * records checksums. 1596e6153918SDarrick J. Wong */ 1597e6153918SDarrick J. Wong struct ext4_dir_entry_tail { 1598e6153918SDarrick J. Wong __le32 det_reserved_zero1; /* Pretend to be unused */ 1599e6153918SDarrick J. Wong __le16 det_rec_len; /* 12 */ 1600e6153918SDarrick J. Wong __u8 det_reserved_zero2; /* Zero name length */ 1601e6153918SDarrick J. Wong __u8 det_reserved_ft; /* 0xDE, fake file type */ 1602e6153918SDarrick J. Wong __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1603e6153918SDarrick J. Wong }; 1604e6153918SDarrick J. Wong 16053c47d541STao Ma #define EXT4_DIRENT_TAIL(block, blocksize) \ 16063c47d541STao Ma ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 16073c47d541STao Ma ((blocksize) - \ 16083c47d541STao Ma sizeof(struct ext4_dir_entry_tail)))) 16093c47d541STao Ma 1610e6153918SDarrick J. Wong /* 16113dcf5451SChristoph Hellwig * Ext4 directory file types. Only the low 3 bits are used. The 16123dcf5451SChristoph Hellwig * other bits are reserved for now. 16133dcf5451SChristoph Hellwig */ 16143dcf5451SChristoph Hellwig #define EXT4_FT_UNKNOWN 0 16153dcf5451SChristoph Hellwig #define EXT4_FT_REG_FILE 1 16163dcf5451SChristoph Hellwig #define EXT4_FT_DIR 2 16173dcf5451SChristoph Hellwig #define EXT4_FT_CHRDEV 3 16183dcf5451SChristoph Hellwig #define EXT4_FT_BLKDEV 4 16193dcf5451SChristoph Hellwig #define EXT4_FT_FIFO 5 16203dcf5451SChristoph Hellwig #define EXT4_FT_SOCK 6 16213dcf5451SChristoph Hellwig #define EXT4_FT_SYMLINK 7 16223dcf5451SChristoph Hellwig 16233dcf5451SChristoph Hellwig #define EXT4_FT_MAX 8 16243dcf5451SChristoph Hellwig 1625e6153918SDarrick J. Wong #define EXT4_FT_DIR_CSUM 0xDE 1626e6153918SDarrick J. Wong 16273dcf5451SChristoph Hellwig /* 16283dcf5451SChristoph Hellwig * EXT4_DIR_PAD defines the directory entries boundaries 16293dcf5451SChristoph Hellwig * 16303dcf5451SChristoph Hellwig * NOTE: It must be a multiple of 4 16313dcf5451SChristoph Hellwig */ 16323dcf5451SChristoph Hellwig #define EXT4_DIR_PAD 4 16333dcf5451SChristoph Hellwig #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 16343dcf5451SChristoph Hellwig #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 16353dcf5451SChristoph Hellwig ~EXT4_DIR_ROUND) 16363dcf5451SChristoph Hellwig #define EXT4_MAX_REC_LEN ((1<<16)-1) 16373dcf5451SChristoph Hellwig 16383dcf5451SChristoph Hellwig /* 16390cfc9255SEric Sandeen * If we ever get support for fs block sizes > page_size, we'll need 16400cfc9255SEric Sandeen * to remove the #if statements in the next two functions... 16410cfc9255SEric Sandeen */ 16420cfc9255SEric Sandeen static inline unsigned int 16430cfc9255SEric Sandeen ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 16440cfc9255SEric Sandeen { 16450cfc9255SEric Sandeen unsigned len = le16_to_cpu(dlen); 16460cfc9255SEric Sandeen 16470cfc9255SEric Sandeen #if (PAGE_CACHE_SIZE >= 65536) 16480cfc9255SEric Sandeen if (len == EXT4_MAX_REC_LEN || len == 0) 16490cfc9255SEric Sandeen return blocksize; 16500cfc9255SEric Sandeen return (len & 65532) | ((len & 3) << 16); 16510cfc9255SEric Sandeen #else 16520cfc9255SEric Sandeen return len; 16530cfc9255SEric Sandeen #endif 16540cfc9255SEric Sandeen } 16550cfc9255SEric Sandeen 16560cfc9255SEric Sandeen static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 16570cfc9255SEric Sandeen { 16580cfc9255SEric Sandeen if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 16590cfc9255SEric Sandeen BUG(); 16600cfc9255SEric Sandeen #if (PAGE_CACHE_SIZE >= 65536) 16610cfc9255SEric Sandeen if (len < 65536) 16620cfc9255SEric Sandeen return cpu_to_le16(len); 16630cfc9255SEric Sandeen if (len == blocksize) { 16640cfc9255SEric Sandeen if (blocksize == 65536) 16650cfc9255SEric Sandeen return cpu_to_le16(EXT4_MAX_REC_LEN); 16660cfc9255SEric Sandeen else 16670cfc9255SEric Sandeen return cpu_to_le16(0); 16680cfc9255SEric Sandeen } 16690cfc9255SEric Sandeen return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 16700cfc9255SEric Sandeen #else 16710cfc9255SEric Sandeen return cpu_to_le16(len); 16720cfc9255SEric Sandeen #endif 16730cfc9255SEric Sandeen } 16740cfc9255SEric Sandeen 16750cfc9255SEric Sandeen /* 16763dcf5451SChristoph Hellwig * Hash Tree Directory indexing 16773dcf5451SChristoph Hellwig * (c) Daniel Phillips, 2001 16783dcf5451SChristoph Hellwig */ 16793dcf5451SChristoph Hellwig 16803dcf5451SChristoph Hellwig #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 16813dcf5451SChristoph Hellwig EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 168212e9b892SDmitry Monakhov ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 16833dcf5451SChristoph Hellwig #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 16843dcf5451SChristoph Hellwig #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 16853dcf5451SChristoph Hellwig 16863dcf5451SChristoph Hellwig /* Legal values for the dx_root hash_version field: */ 16873dcf5451SChristoph Hellwig 16883dcf5451SChristoph Hellwig #define DX_HASH_LEGACY 0 16893dcf5451SChristoph Hellwig #define DX_HASH_HALF_MD4 1 16903dcf5451SChristoph Hellwig #define DX_HASH_TEA 2 1691f99b2589STheodore Ts'o #define DX_HASH_LEGACY_UNSIGNED 3 1692f99b2589STheodore Ts'o #define DX_HASH_HALF_MD4_UNSIGNED 4 1693f99b2589STheodore Ts'o #define DX_HASH_TEA_UNSIGNED 5 16943dcf5451SChristoph Hellwig 16950441984aSDarrick J. Wong static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 16960441984aSDarrick J. Wong const void *address, unsigned int length) 16970441984aSDarrick J. Wong { 16980441984aSDarrick J. Wong struct { 16990441984aSDarrick J. Wong struct shash_desc shash; 17003108b54bSTheodore Ts'o char ctx[4]; 17010441984aSDarrick J. Wong } desc; 17020441984aSDarrick J. Wong int err; 17030441984aSDarrick J. Wong 17043108b54bSTheodore Ts'o BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 17053108b54bSTheodore Ts'o 17060441984aSDarrick J. Wong desc.shash.tfm = sbi->s_chksum_driver; 17070441984aSDarrick J. Wong desc.shash.flags = 0; 17080441984aSDarrick J. Wong *(u32 *)desc.ctx = crc; 17090441984aSDarrick J. Wong 17100441984aSDarrick J. Wong err = crypto_shash_update(&desc.shash, address, length); 17110441984aSDarrick J. Wong BUG_ON(err); 17120441984aSDarrick J. Wong 17130441984aSDarrick J. Wong return *(u32 *)desc.ctx; 17140441984aSDarrick J. Wong } 17150441984aSDarrick J. Wong 17163dcf5451SChristoph Hellwig #ifdef __KERNEL__ 17173dcf5451SChristoph Hellwig 17183dcf5451SChristoph Hellwig /* hash info structure used by the directory hash */ 17193dcf5451SChristoph Hellwig struct dx_hash_info 17203dcf5451SChristoph Hellwig { 17213dcf5451SChristoph Hellwig u32 hash; 17223dcf5451SChristoph Hellwig u32 minor_hash; 17233dcf5451SChristoph Hellwig int hash_version; 17243dcf5451SChristoph Hellwig u32 *seed; 17253dcf5451SChristoph Hellwig }; 17263dcf5451SChristoph Hellwig 1727d1f5273eSFan Yong 1728d1f5273eSFan Yong /* 32 and 64 bit signed EOF for dx directories */ 1729d1f5273eSFan Yong #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1730d1f5273eSFan Yong #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1731d1f5273eSFan Yong 17323dcf5451SChristoph Hellwig 17333dcf5451SChristoph Hellwig /* 17343dcf5451SChristoph Hellwig * Control parameters used by ext4_htree_next_block 17353dcf5451SChristoph Hellwig */ 17363dcf5451SChristoph Hellwig #define HASH_NB_ALWAYS 1 17373dcf5451SChristoph Hellwig 17383dcf5451SChristoph Hellwig 17393dcf5451SChristoph Hellwig /* 17403dcf5451SChristoph Hellwig * Describe an inode's exact location on disk and in memory 17413dcf5451SChristoph Hellwig */ 17423dcf5451SChristoph Hellwig struct ext4_iloc 17433dcf5451SChristoph Hellwig { 17443dcf5451SChristoph Hellwig struct buffer_head *bh; 17453dcf5451SChristoph Hellwig unsigned long offset; 17463dcf5451SChristoph Hellwig ext4_group_t block_group; 17473dcf5451SChristoph Hellwig }; 17483dcf5451SChristoph Hellwig 17493dcf5451SChristoph Hellwig static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 17503dcf5451SChristoph Hellwig { 17513dcf5451SChristoph Hellwig return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 17523dcf5451SChristoph Hellwig } 17533dcf5451SChristoph Hellwig 17543dcf5451SChristoph Hellwig /* 17553dcf5451SChristoph Hellwig * This structure is stuffed into the struct file's private_data field 17563dcf5451SChristoph Hellwig * for directories. It is where we put information so that we can do 17573dcf5451SChristoph Hellwig * readdir operations in hash tree order. 17583dcf5451SChristoph Hellwig */ 17593dcf5451SChristoph Hellwig struct dir_private_info { 17603dcf5451SChristoph Hellwig struct rb_root root; 17613dcf5451SChristoph Hellwig struct rb_node *curr_node; 17623dcf5451SChristoph Hellwig struct fname *extra_fname; 17633dcf5451SChristoph Hellwig loff_t last_pos; 17643dcf5451SChristoph Hellwig __u32 curr_hash; 17653dcf5451SChristoph Hellwig __u32 curr_minor_hash; 17663dcf5451SChristoph Hellwig __u32 next_hash; 17673dcf5451SChristoph Hellwig }; 17683dcf5451SChristoph Hellwig 17693dcf5451SChristoph Hellwig /* calculate the first block number of the group */ 17703dcf5451SChristoph Hellwig static inline ext4_fsblk_t 17713dcf5451SChristoph Hellwig ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 17723dcf5451SChristoph Hellwig { 17733dcf5451SChristoph Hellwig return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 17743dcf5451SChristoph Hellwig le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 17753dcf5451SChristoph Hellwig } 17763dcf5451SChristoph Hellwig 17773dcf5451SChristoph Hellwig /* 17783dcf5451SChristoph Hellwig * Special error return code only used by dx_probe() and its callers. 17793dcf5451SChristoph Hellwig */ 17803dcf5451SChristoph Hellwig #define ERR_BAD_DX_DIR -75000 17813dcf5451SChristoph Hellwig 17823dcf5451SChristoph Hellwig /* 1783bfff6873SLukas Czerner * Timeout and state flag for lazy initialization inode thread. 1784bfff6873SLukas Czerner */ 1785bfff6873SLukas Czerner #define EXT4_DEF_LI_WAIT_MULT 10 1786bfff6873SLukas Czerner #define EXT4_DEF_LI_MAX_START_DELAY 5 1787bfff6873SLukas Czerner #define EXT4_LAZYINIT_QUIT 0x0001 1788bfff6873SLukas Czerner #define EXT4_LAZYINIT_RUNNING 0x0002 1789bfff6873SLukas Czerner 1790bfff6873SLukas Czerner /* 1791bfff6873SLukas Czerner * Lazy inode table initialization info 1792bfff6873SLukas Czerner */ 1793bfff6873SLukas Czerner struct ext4_lazy_init { 1794bfff6873SLukas Czerner unsigned long li_state; 1795bfff6873SLukas Czerner struct list_head li_request_list; 1796bfff6873SLukas Czerner struct mutex li_list_mtx; 1797bfff6873SLukas Czerner }; 1798bfff6873SLukas Czerner 1799bfff6873SLukas Czerner struct ext4_li_request { 1800bfff6873SLukas Czerner struct super_block *lr_super; 1801bfff6873SLukas Czerner struct ext4_sb_info *lr_sbi; 1802bfff6873SLukas Czerner ext4_group_t lr_next_group; 1803bfff6873SLukas Czerner struct list_head lr_request; 1804bfff6873SLukas Czerner unsigned long lr_next_sched; 1805bfff6873SLukas Czerner unsigned long lr_timeout; 1806bfff6873SLukas Czerner }; 1807bfff6873SLukas Czerner 1808857ac889SLukas Czerner struct ext4_features { 1809857ac889SLukas Czerner struct kobject f_kobj; 1810857ac889SLukas Czerner struct completion f_kobj_unregister; 1811857ac889SLukas Czerner }; 1812857ac889SLukas Czerner 1813bfff6873SLukas Czerner /* 1814c5e06d10SJohann Lombardi * This structure will be used for multiple mount protection. It will be 1815c5e06d10SJohann Lombardi * written into the block number saved in the s_mmp_block field in the 1816c5e06d10SJohann Lombardi * superblock. Programs that check MMP should assume that if 1817c5e06d10SJohann Lombardi * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1818c5e06d10SJohann Lombardi * to use the filesystem, regardless of how old the timestamp is. 1819c5e06d10SJohann Lombardi */ 1820c5e06d10SJohann Lombardi #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1821c5e06d10SJohann Lombardi #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1822c5e06d10SJohann Lombardi #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1823c5e06d10SJohann Lombardi #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1824c5e06d10SJohann Lombardi 1825c5e06d10SJohann Lombardi struct mmp_struct { 1826c5e06d10SJohann Lombardi __le32 mmp_magic; /* Magic number for MMP */ 1827c5e06d10SJohann Lombardi __le32 mmp_seq; /* Sequence no. updated periodically */ 1828c5e06d10SJohann Lombardi 1829c5e06d10SJohann Lombardi /* 1830c5e06d10SJohann Lombardi * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1831c5e06d10SJohann Lombardi * purposes and do not affect the correctness of the algorithm 1832c5e06d10SJohann Lombardi */ 1833c5e06d10SJohann Lombardi __le64 mmp_time; /* Time last updated */ 1834c5e06d10SJohann Lombardi char mmp_nodename[64]; /* Node which last updated MMP block */ 1835c5e06d10SJohann Lombardi char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1836c5e06d10SJohann Lombardi 1837c5e06d10SJohann Lombardi /* 1838c5e06d10SJohann Lombardi * mmp_check_interval is used to verify if the MMP block has been 1839c5e06d10SJohann Lombardi * updated on the block device. The value is updated based on the 1840c5e06d10SJohann Lombardi * maximum time to write the MMP block during an update cycle. 1841c5e06d10SJohann Lombardi */ 1842c5e06d10SJohann Lombardi __le16 mmp_check_interval; 1843c5e06d10SJohann Lombardi 1844c5e06d10SJohann Lombardi __le16 mmp_pad1; 1845e6153918SDarrick J. Wong __le32 mmp_pad2[226]; 1846e6153918SDarrick J. Wong __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1847c5e06d10SJohann Lombardi }; 1848c5e06d10SJohann Lombardi 1849c5e06d10SJohann Lombardi /* arguments passed to the mmp thread */ 1850c5e06d10SJohann Lombardi struct mmpd_data { 1851c5e06d10SJohann Lombardi struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1852c5e06d10SJohann Lombardi struct super_block *sb; /* super block of the fs */ 1853c5e06d10SJohann Lombardi }; 1854c5e06d10SJohann Lombardi 1855c5e06d10SJohann Lombardi /* 1856c5e06d10SJohann Lombardi * Check interval multiplier 1857c5e06d10SJohann Lombardi * The MMP block is written every update interval and initially checked every 1858c5e06d10SJohann Lombardi * update interval x the multiplier (the value is then adapted based on the 1859c5e06d10SJohann Lombardi * write latency). The reason is that writes can be delayed under load and we 1860c5e06d10SJohann Lombardi * don't want readers to incorrectly assume that the filesystem is no longer 1861c5e06d10SJohann Lombardi * in use. 1862c5e06d10SJohann Lombardi */ 1863c5e06d10SJohann Lombardi #define EXT4_MMP_CHECK_MULT 2UL 1864c5e06d10SJohann Lombardi 1865c5e06d10SJohann Lombardi /* 1866c5e06d10SJohann Lombardi * Minimum interval for MMP checking in seconds. 1867c5e06d10SJohann Lombardi */ 1868c5e06d10SJohann Lombardi #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1869c5e06d10SJohann Lombardi 1870c5e06d10SJohann Lombardi /* 1871c5e06d10SJohann Lombardi * Maximum interval for MMP checking in seconds. 1872c5e06d10SJohann Lombardi */ 1873c5e06d10SJohann Lombardi #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1874c5e06d10SJohann Lombardi 1875c5e06d10SJohann Lombardi /* 18763dcf5451SChristoph Hellwig * Function prototypes 18773dcf5451SChristoph Hellwig */ 18783dcf5451SChristoph Hellwig 18793dcf5451SChristoph Hellwig /* 18803dcf5451SChristoph Hellwig * Ok, these declarations are also in <linux/kernel.h> but none of the 18813dcf5451SChristoph Hellwig * ext4 source programs needs to include it so they are duplicated here. 18823dcf5451SChristoph Hellwig */ 18833dcf5451SChristoph Hellwig # define NORET_TYPE /**/ 18843dcf5451SChristoph Hellwig # define ATTRIB_NORET __attribute__((noreturn)) 18853dcf5451SChristoph Hellwig # define NORET_AND noreturn, 18863dcf5451SChristoph Hellwig 1887498e5f24STheodore Ts'o /* bitmap.c */ 1888f6fb99caSTheodore Ts'o extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 188941a246d1SDarrick J. Wong void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 189041a246d1SDarrick J. Wong struct ext4_group_desc *gdp, 189141a246d1SDarrick J. Wong struct buffer_head *bh, int sz); 189241a246d1SDarrick J. Wong int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 189341a246d1SDarrick J. Wong struct ext4_group_desc *gdp, 189441a246d1SDarrick J. Wong struct buffer_head *bh, int sz); 1895fa77dcfaSDarrick J. Wong void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1896fa77dcfaSDarrick J. Wong struct ext4_group_desc *gdp, 189779f1ba49STao Ma struct buffer_head *bh); 1898fa77dcfaSDarrick J. Wong int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1899fa77dcfaSDarrick J. Wong struct ext4_group_desc *gdp, 190079f1ba49STao Ma struct buffer_head *bh); 1901498e5f24STheodore Ts'o 19023dcf5451SChristoph Hellwig /* balloc.c */ 1903bd86298eSLukas Czerner extern void ext4_get_group_no_and_offset(struct super_block *sb, 1904bd86298eSLukas Czerner ext4_fsblk_t blocknr, 1905bd86298eSLukas Czerner ext4_group_t *blockgrpp, 1906bd86298eSLukas Czerner ext4_grpblk_t *offsetp); 1907bd86298eSLukas Czerner extern ext4_group_t ext4_get_group_number(struct super_block *sb, 1908bd86298eSLukas Czerner ext4_fsblk_t block); 1909bd86298eSLukas Czerner 1910fa77dcfaSDarrick J. Wong extern void ext4_validate_block_bitmap(struct super_block *sb, 1911fa77dcfaSDarrick J. Wong struct ext4_group_desc *desc, 1912fa77dcfaSDarrick J. Wong unsigned int block_group, 1913fa77dcfaSDarrick J. Wong struct buffer_head *bh); 19143dcf5451SChristoph Hellwig extern unsigned int ext4_block_group(struct super_block *sb, 19153dcf5451SChristoph Hellwig ext4_fsblk_t blocknr); 19163dcf5451SChristoph Hellwig extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 19173dcf5451SChristoph Hellwig ext4_fsblk_t blocknr); 19183dcf5451SChristoph Hellwig extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 19193dcf5451SChristoph Hellwig extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 19203dcf5451SChristoph Hellwig ext4_group_t group); 19217061eba7SAneesh Kumar K.V extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 192255f020dbSAllison Henderson ext4_fsblk_t goal, 192355f020dbSAllison Henderson unsigned int flags, 192455f020dbSAllison Henderson unsigned long *count, 192555f020dbSAllison Henderson int *errp); 1926e7d5f315STheodore Ts'o extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 1927e7d5f315STheodore Ts'o s64 nclusters, unsigned int flags); 19285dee5437STheodore Ts'o extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 19293dcf5451SChristoph Hellwig extern void ext4_check_blocks_bitmap(struct super_block *); 19303dcf5451SChristoph Hellwig extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 19313dcf5451SChristoph Hellwig ext4_group_t block_group, 19323dcf5451SChristoph Hellwig struct buffer_head ** bh); 19333dcf5451SChristoph Hellwig extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1934813e5727STheodore Ts'o 1935813e5727STheodore Ts'o extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 1936813e5727STheodore Ts'o ext4_group_t block_group); 1937813e5727STheodore Ts'o extern int ext4_wait_block_bitmap(struct super_block *sb, 1938813e5727STheodore Ts'o ext4_group_t block_group, 1939813e5727STheodore Ts'o struct buffer_head *bh); 1940813e5727STheodore Ts'o extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1941bb23c20aSTheodore Ts'o ext4_group_t block_group); 1942fd034a84STheodore Ts'o extern void ext4_init_block_bitmap(struct super_block *sb, 1943bb23c20aSTheodore Ts'o struct buffer_head *bh, 1944bb23c20aSTheodore Ts'o ext4_group_t group, 1945bb23c20aSTheodore Ts'o struct ext4_group_desc *desc); 1946cff1dfd7STheodore Ts'o extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 1947fd034a84STheodore Ts'o ext4_group_t block_group, 1948fd034a84STheodore Ts'o struct ext4_group_desc *gdp); 1949d5b8f310STheodore Ts'o extern unsigned ext4_num_overhead_clusters(struct super_block *sb, 1950d5b8f310STheodore Ts'o ext4_group_t block_group, 1951d5b8f310STheodore Ts'o struct ext4_group_desc *gdp); 1952f86186b4SEric Sandeen ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 19533dcf5451SChristoph Hellwig 19543dcf5451SChristoph Hellwig /* dir.c */ 195560fd4da3STheodore Ts'o extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 1956f7c21177STheodore Ts'o struct file *, 19573dcf5451SChristoph Hellwig struct ext4_dir_entry_2 *, 1958226ba972STao Ma struct buffer_head *, char *, int, 1959226ba972STao Ma unsigned int); 1960226ba972STao Ma #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 1961f7c21177STheodore Ts'o unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 1962226ba972STao Ma (de), (bh), (buf), (size), (offset))) 19633dcf5451SChristoph Hellwig extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 19643dcf5451SChristoph Hellwig __u32 minor_hash, 19653dcf5451SChristoph Hellwig struct ext4_dir_entry_2 *dirent); 19663dcf5451SChristoph Hellwig extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1967978fef91STao Ma extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 1968978fef91STao Ma struct buffer_head *bh, 1969978fef91STao Ma void *buf, int buf_size, 1970978fef91STao Ma const char *name, int namelen, 1971978fef91STao Ma struct ext4_dir_entry_2 **dest_de); 1972978fef91STao Ma void ext4_insert_dentry(struct inode *inode, 1973978fef91STao Ma struct ext4_dir_entry_2 *de, 1974978fef91STao Ma int buf_size, 1975978fef91STao Ma const char *name, int namelen); 1976978fef91STao Ma static inline void ext4_update_dx_flag(struct inode *inode) 1977978fef91STao Ma { 1978978fef91STao Ma if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb, 1979978fef91STao Ma EXT4_FEATURE_COMPAT_DIR_INDEX)) 1980978fef91STao Ma ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 1981978fef91STao Ma } 198265d165d9STao Ma static unsigned char ext4_filetype_table[] = { 198365d165d9STao Ma DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 198465d165d9STao Ma }; 198565d165d9STao Ma 198665d165d9STao Ma static inline unsigned char get_dtype(struct super_block *sb, int filetype) 198765d165d9STao Ma { 198865d165d9STao Ma if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) || 198965d165d9STao Ma (filetype >= EXT4_FT_MAX)) 199065d165d9STao Ma return DT_UNKNOWN; 199165d165d9STao Ma 199265d165d9STao Ma return ext4_filetype_table[filetype]; 199365d165d9STao Ma } 19943dcf5451SChristoph Hellwig 19953dcf5451SChristoph Hellwig /* fsync.c */ 199602c24a82SJosef Bacik extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 1997c278531dSDmitry Monakhov extern int ext4_flush_unwritten_io(struct inode *); 19983dcf5451SChristoph Hellwig 19993dcf5451SChristoph Hellwig /* hash.c */ 20003dcf5451SChristoph Hellwig extern int ext4fs_dirhash(const char *name, int len, struct 20013dcf5451SChristoph Hellwig dx_hash_info *hinfo); 20023dcf5451SChristoph Hellwig 20033dcf5451SChristoph Hellwig /* ialloc.c */ 20041139575aSTheodore Ts'o extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 20055cb81dabSDmitry Monakhov const struct qstr *qstr, __u32 goal, 20061139575aSTheodore Ts'o uid_t *owner, int handle_type, 20071139575aSTheodore Ts'o unsigned int line_no, int nblocks); 20081139575aSTheodore Ts'o 20091139575aSTheodore Ts'o #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 20101139575aSTheodore Ts'o __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 20111139575aSTheodore Ts'o 0, 0, 0) 20121139575aSTheodore Ts'o #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 20131139575aSTheodore Ts'o type, nblocks) \ 20141139575aSTheodore Ts'o __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 20151139575aSTheodore Ts'o (type), __LINE__, (nblocks)) 20161139575aSTheodore Ts'o 20171139575aSTheodore Ts'o 20183dcf5451SChristoph Hellwig extern void ext4_free_inode(handle_t *, struct inode *); 20193dcf5451SChristoph Hellwig extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 20203dcf5451SChristoph Hellwig extern unsigned long ext4_count_free_inodes(struct super_block *); 20213dcf5451SChristoph Hellwig extern unsigned long ext4_count_dirs(struct super_block *); 20223dcf5451SChristoph Hellwig extern void ext4_check_inodes_bitmap(struct super_block *); 202361d08673STheodore Ts'o extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2024bfff6873SLukas Czerner extern int ext4_init_inode_table(struct super_block *sb, 2025bfff6873SLukas Czerner ext4_group_t group, int barrier); 2026813e5727STheodore Ts'o extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 20273dcf5451SChristoph Hellwig 20283dcf5451SChristoph Hellwig /* mballoc.c */ 20293dcf5451SChristoph Hellwig extern long ext4_mb_stats; 20303dcf5451SChristoph Hellwig extern long ext4_mb_max_to_scan; 20319d99012fSAkira Fujita extern int ext4_mb_init(struct super_block *); 20323dcf5451SChristoph Hellwig extern int ext4_mb_release(struct super_block *); 20333dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 20343dcf5451SChristoph Hellwig struct ext4_allocation_request *, int *); 20353dcf5451SChristoph Hellwig extern int ext4_mb_reserve_blocks(struct super_block *, int); 2036c2ea3fdeSTheodore Ts'o extern void ext4_discard_preallocations(struct inode *); 20375dabfc78STheodore Ts'o extern int __init ext4_init_mballoc(void); 20385dabfc78STheodore Ts'o extern void ext4_exit_mballoc(void); 203944338711STheodore Ts'o extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2040e6362609STheodore Ts'o struct buffer_head *bh, ext4_fsblk_t block, 2041e6362609STheodore Ts'o unsigned long count, int flags); 204228623c2fSTheodore Ts'o extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 204328623c2fSTheodore Ts'o ext4_group_t ngroups); 2044920313a7SAneesh Kumar K.V extern int ext4_mb_add_groupinfo(struct super_block *sb, 20455f21b0e6SFrederic Bohe ext4_group_t i, struct ext4_group_desc *desc); 2046cc7365dfSYongqiang Yang extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 20472846e820SAmir Goldstein ext4_fsblk_t block, unsigned long count); 20487360d173SLukas Czerner extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 20497360d173SLukas Czerner 20503dcf5451SChristoph Hellwig /* inode.c */ 20513dcf5451SChristoph Hellwig struct buffer_head *ext4_getblk(handle_t *, struct inode *, 20523dcf5451SChristoph Hellwig ext4_lblk_t, int, int *); 20533dcf5451SChristoph Hellwig struct buffer_head *ext4_bread(handle_t *, struct inode *, 20543dcf5451SChristoph Hellwig ext4_lblk_t, int, int *); 2055f19d5870STao Ma int ext4_get_block_write(struct inode *inode, sector_t iblock, 2056f19d5870STao Ma struct buffer_head *bh_result, int create); 20576873fa0dSEric Sandeen int ext4_get_block(struct inode *inode, sector_t iblock, 20586873fa0dSEric Sandeen struct buffer_head *bh_result, int create); 20599c3569b5STao Ma int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 20609c3569b5STao Ma struct buffer_head *bh, int create); 2061f19d5870STao Ma int ext4_walk_page_buffers(handle_t *handle, 2062f19d5870STao Ma struct buffer_head *head, 2063f19d5870STao Ma unsigned from, 2064f19d5870STao Ma unsigned to, 2065f19d5870STao Ma int *partial, 2066f19d5870STao Ma int (*fn)(handle_t *handle, 2067f19d5870STao Ma struct buffer_head *bh)); 2068f19d5870STao Ma int do_journal_get_write_access(handle_t *handle, 2069f19d5870STao Ma struct buffer_head *bh); 20709c3569b5STao Ma #define FALL_BACK_TO_NONDELALLOC 1 20719c3569b5STao Ma #define CONVERT_INLINE_DATA 2 20723dcf5451SChristoph Hellwig 20733dcf5451SChristoph Hellwig extern struct inode *ext4_iget(struct super_block *, unsigned long); 2074a9185b41SChristoph Hellwig extern int ext4_write_inode(struct inode *, struct writeback_control *); 20753dcf5451SChristoph Hellwig extern int ext4_setattr(struct dentry *, struct iattr *); 20763e3398a0SMingming Cao extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 20773e3398a0SMingming Cao struct kstat *stat); 20780930fcc1SAl Viro extern void ext4_evict_inode(struct inode *); 20790930fcc1SAl Viro extern void ext4_clear_inode(struct inode *); 20803dcf5451SChristoph Hellwig extern int ext4_sync_inode(handle_t *, struct inode *); 2081aa385729SChristoph Hellwig extern void ext4_dirty_inode(struct inode *, int); 20823dcf5451SChristoph Hellwig extern int ext4_change_inode_journal_flag(struct inode *, int); 20833dcf5451SChristoph Hellwig extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 208491ef4cafSDuane Griffin extern int ext4_can_truncate(struct inode *inode); 20853dcf5451SChristoph Hellwig extern void ext4_truncate(struct inode *); 2086a4bb6b64SAllison Henderson extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); 2087487caeefSJan Kara extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 20883dcf5451SChristoph Hellwig extern void ext4_set_inode_flags(struct inode *); 20893dcf5451SChristoph Hellwig extern void ext4_get_inode_flags(struct ext4_inode_info *); 2090ccd2506bSTheodore Ts'o extern int ext4_alloc_da_blocks(struct inode *inode); 20913dcf5451SChristoph Hellwig extern void ext4_set_aops(struct inode *inode); 20923dcf5451SChristoph Hellwig extern int ext4_writepage_trans_blocks(struct inode *); 2093f3bd1f3fSMingming Cao extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2094d863dc36SLukas Czerner extern int ext4_block_truncate_page(handle_t *handle, 2095d863dc36SLukas Czerner struct address_space *mapping, loff_t from); 2096d863dc36SLukas Czerner extern int ext4_block_zero_page_range(handle_t *handle, 2097d863dc36SLukas Czerner struct address_space *mapping, loff_t from, loff_t length); 2098a87dd18cSLukas Czerner extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2099a87dd18cSLukas Czerner loff_t lstart, loff_t lend); 2100c2ec175cSNick Piggin extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2101a9e7f447SDmitry Monakhov extern qsize_t *ext4_get_reserved_space(struct inode *inode); 21025f634d06SAneesh Kumar K.V extern void ext4_da_update_reserve_space(struct inode *inode, 21035f634d06SAneesh Kumar K.V int used, int quota_claim); 2104dae1e52cSAmir Goldstein 2105dae1e52cSAmir Goldstein /* indirect.c */ 2106dae1e52cSAmir Goldstein extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2107dae1e52cSAmir Goldstein struct ext4_map_blocks *map, int flags); 2108dae1e52cSAmir Goldstein extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, 2109dae1e52cSAmir Goldstein const struct iovec *iov, loff_t offset, 2110dae1e52cSAmir Goldstein unsigned long nr_segs); 2111dae1e52cSAmir Goldstein extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2112fa55a0edSJan Kara extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2113819c4920STheodore Ts'o extern void ext4_ind_truncate(handle_t *, struct inode *inode); 211426a4c0c6STheodore Ts'o extern int ext4_free_hole_blocks(handle_t *handle, struct inode *inode, 211526a4c0c6STheodore Ts'o ext4_lblk_t first, ext4_lblk_t stop); 2116ff9893dcSAmir Goldstein 21173dcf5451SChristoph Hellwig /* ioctl.c */ 21183dcf5451SChristoph Hellwig extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 21193dcf5451SChristoph Hellwig extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 21203dcf5451SChristoph Hellwig 21213dcf5451SChristoph Hellwig /* migrate.c */ 21222a43a878SAneesh Kumar K.V extern int ext4_ext_migrate(struct inode *); 21230d14b098SLukas Czerner extern int ext4_ind_migrate(struct inode *inode); 21243d0518f4SWei Yongjun 21253dcf5451SChristoph Hellwig /* namei.c */ 2126b0336e8dSDarrick J. Wong extern int ext4_dirent_csum_verify(struct inode *inode, 2127b0336e8dSDarrick J. Wong struct ext4_dir_entry *dirent); 21283dcf5451SChristoph Hellwig extern int ext4_orphan_add(handle_t *, struct inode *); 21293dcf5451SChristoph Hellwig extern int ext4_orphan_del(handle_t *, struct inode *); 21303dcf5451SChristoph Hellwig extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 21313dcf5451SChristoph Hellwig __u32 start_minor_hash, __u32 *next_hash); 21327335cd3bSTao Ma extern int search_dir(struct buffer_head *bh, 21337335cd3bSTao Ma char *search_buf, 21347335cd3bSTao Ma int buf_size, 21357335cd3bSTao Ma struct inode *dir, 21367335cd3bSTao Ma const struct qstr *d_name, 21377335cd3bSTao Ma unsigned int offset, 21387335cd3bSTao Ma struct ext4_dir_entry_2 **res_dir); 213905019a9eSTao Ma extern int ext4_generic_delete_entry(handle_t *handle, 214005019a9eSTao Ma struct inode *dir, 214105019a9eSTao Ma struct ext4_dir_entry_2 *de_del, 214205019a9eSTao Ma struct buffer_head *bh, 214305019a9eSTao Ma void *entry_buf, 214405019a9eSTao Ma int buf_size, 214505019a9eSTao Ma int csum_size); 21463dcf5451SChristoph Hellwig 21473dcf5451SChristoph Hellwig /* resize.c */ 21483dcf5451SChristoph Hellwig extern int ext4_group_add(struct super_block *sb, 21493dcf5451SChristoph Hellwig struct ext4_new_group_data *input); 21503dcf5451SChristoph Hellwig extern int ext4_group_extend(struct super_block *sb, 21513dcf5451SChristoph Hellwig struct ext4_super_block *es, 21523dcf5451SChristoph Hellwig ext4_fsblk_t n_blocks_count); 215319c5246dSYongqiang Yang extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 21543dcf5451SChristoph Hellwig 21553dcf5451SChristoph Hellwig /* super.c */ 2156952fc18eSTheodore Ts'o extern int ext4_calculate_overhead(struct super_block *sb); 2157a9c47317SDarrick J. Wong extern int ext4_superblock_csum_verify(struct super_block *sb, 2158a9c47317SDarrick J. Wong struct ext4_super_block *es); 215906db49e6STheodore Ts'o extern void ext4_superblock_csum_set(struct super_block *sb); 21609933fc0aSTheodore Ts'o extern void *ext4_kvmalloc(size_t size, gfp_t flags); 21619933fc0aSTheodore Ts'o extern void *ext4_kvzalloc(size_t size, gfp_t flags); 21629933fc0aSTheodore Ts'o extern void ext4_kvfree(void *ptr); 2163117fff10STheodore Ts'o extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2164117fff10STheodore Ts'o ext4_group_t ngroup); 2165722887ddSTheodore Ts'o extern const char *ext4_decode_error(struct super_block *sb, int errno, 2166722887ddSTheodore Ts'o char nbuf[16]); 2167b9075fa9SJoe Perches extern __printf(4, 5) 2168b9075fa9SJoe Perches void __ext4_error(struct super_block *, const char *, unsigned int, 2169b9075fa9SJoe Perches const char *, ...); 2170c398eda0STheodore Ts'o #define ext4_error(sb, message...) __ext4_error(sb, __func__, \ 2171c398eda0STheodore Ts'o __LINE__, ## message) 2172b9075fa9SJoe Perches extern __printf(5, 6) 2173b9075fa9SJoe Perches void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2174b9075fa9SJoe Perches const char *, ...); 2175b9075fa9SJoe Perches extern __printf(5, 6) 2176b9075fa9SJoe Perches void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2177b9075fa9SJoe Perches const char *, ...); 2178c398eda0STheodore Ts'o extern void __ext4_std_error(struct super_block *, const char *, 2179c398eda0STheodore Ts'o unsigned int, int); 2180b9075fa9SJoe Perches extern __printf(4, 5) 2181b9075fa9SJoe Perches void __ext4_abort(struct super_block *, const char *, unsigned int, 2182b9075fa9SJoe Perches const char *, ...); 2183c398eda0STheodore Ts'o #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \ 2184c398eda0STheodore Ts'o __LINE__, ## message) 2185b9075fa9SJoe Perches extern __printf(4, 5) 2186b9075fa9SJoe Perches void __ext4_warning(struct super_block *, const char *, unsigned int, 2187b9075fa9SJoe Perches const char *, ...); 2188c398eda0STheodore Ts'o #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \ 2189c398eda0STheodore Ts'o __LINE__, ## message) 2190b9075fa9SJoe Perches extern __printf(3, 4) 2191b9075fa9SJoe Perches void ext4_msg(struct super_block *, const char *, const char *, ...); 2192c5e06d10SJohann Lombardi extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2193c5e06d10SJohann Lombardi const char *, unsigned int, const char *); 2194c5e06d10SJohann Lombardi #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \ 2195c5e06d10SJohann Lombardi __LINE__, msg) 2196b9075fa9SJoe Perches extern __printf(7, 8) 2197b9075fa9SJoe Perches void __ext4_grp_locked_error(const char *, unsigned int, 2198b9075fa9SJoe Perches struct super_block *, ext4_group_t, 2199b9075fa9SJoe Perches unsigned long, ext4_fsblk_t, 2200b9075fa9SJoe Perches const char *, ...); 2201e29136f8STheodore Ts'o #define ext4_grp_locked_error(sb, grp, message...) \ 2202e29136f8STheodore Ts'o __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message) 22033dcf5451SChristoph Hellwig extern void ext4_update_dynamic_rev(struct super_block *sb); 22043dcf5451SChristoph Hellwig extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 22053dcf5451SChristoph Hellwig __u32 compat); 22063dcf5451SChristoph Hellwig extern int ext4_update_rocompat_feature(handle_t *handle, 22073dcf5451SChristoph Hellwig struct super_block *sb, __u32 rocompat); 22083dcf5451SChristoph Hellwig extern int ext4_update_incompat_feature(handle_t *handle, 22093dcf5451SChristoph Hellwig struct super_block *sb, __u32 incompat); 22103dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 22113dcf5451SChristoph Hellwig struct ext4_group_desc *bg); 22123dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 22133dcf5451SChristoph Hellwig struct ext4_group_desc *bg); 22143dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 22153dcf5451SChristoph Hellwig struct ext4_group_desc *bg); 2216021b65bbSTheodore Ts'o extern __u32 ext4_free_group_clusters(struct super_block *sb, 2217560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 2218560671a0SAneesh Kumar K.V extern __u32 ext4_free_inodes_count(struct super_block *sb, 2219560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 2220560671a0SAneesh Kumar K.V extern __u32 ext4_used_dirs_count(struct super_block *sb, 2221560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 2222560671a0SAneesh Kumar K.V extern __u32 ext4_itable_unused_count(struct super_block *sb, 2223560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 22243dcf5451SChristoph Hellwig extern void ext4_block_bitmap_set(struct super_block *sb, 22253dcf5451SChristoph Hellwig struct ext4_group_desc *bg, ext4_fsblk_t blk); 22263dcf5451SChristoph Hellwig extern void ext4_inode_bitmap_set(struct super_block *sb, 22273dcf5451SChristoph Hellwig struct ext4_group_desc *bg, ext4_fsblk_t blk); 22283dcf5451SChristoph Hellwig extern void ext4_inode_table_set(struct super_block *sb, 22293dcf5451SChristoph Hellwig struct ext4_group_desc *bg, ext4_fsblk_t blk); 2230021b65bbSTheodore Ts'o extern void ext4_free_group_clusters_set(struct super_block *sb, 2231021b65bbSTheodore Ts'o struct ext4_group_desc *bg, 2232021b65bbSTheodore Ts'o __u32 count); 2233560671a0SAneesh Kumar K.V extern void ext4_free_inodes_set(struct super_block *sb, 2234560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count); 2235560671a0SAneesh Kumar K.V extern void ext4_used_dirs_set(struct super_block *sb, 2236560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count); 2237560671a0SAneesh Kumar K.V extern void ext4_itable_unused_set(struct super_block *sb, 2238560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count); 2239feb0ab32SDarrick J. Wong extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2240bb23c20aSTheodore Ts'o struct ext4_group_desc *gdp); 2241feb0ab32SDarrick J. Wong extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2242bb23c20aSTheodore Ts'o struct ext4_group_desc *gdp); 22437f511862STheodore Ts'o extern int ext4_register_li_request(struct super_block *sb, 22447f511862STheodore Ts'o ext4_group_t first_not_zeroed); 22453dcf5451SChristoph Hellwig 224641a246d1SDarrick J. Wong static inline int ext4_has_group_desc_csum(struct super_block *sb) 224741a246d1SDarrick J. Wong { 224841a246d1SDarrick J. Wong return EXT4_HAS_RO_COMPAT_FEATURE(sb, 224941a246d1SDarrick J. Wong EXT4_FEATURE_RO_COMPAT_GDT_CSUM | 225041a246d1SDarrick J. Wong EXT4_FEATURE_RO_COMPAT_METADATA_CSUM); 225141a246d1SDarrick J. Wong } 225241a246d1SDarrick J. Wong 22533dcf5451SChristoph Hellwig static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 22543dcf5451SChristoph Hellwig { 22553dcf5451SChristoph Hellwig return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 22563dcf5451SChristoph Hellwig le32_to_cpu(es->s_blocks_count_lo); 22573dcf5451SChristoph Hellwig } 22583dcf5451SChristoph Hellwig 22593dcf5451SChristoph Hellwig static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 22603dcf5451SChristoph Hellwig { 22613dcf5451SChristoph Hellwig return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 22623dcf5451SChristoph Hellwig le32_to_cpu(es->s_r_blocks_count_lo); 22633dcf5451SChristoph Hellwig } 22643dcf5451SChristoph Hellwig 22653dcf5451SChristoph Hellwig static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 22663dcf5451SChristoph Hellwig { 22673dcf5451SChristoph Hellwig return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 22683dcf5451SChristoph Hellwig le32_to_cpu(es->s_free_blocks_count_lo); 22693dcf5451SChristoph Hellwig } 22703dcf5451SChristoph Hellwig 22713dcf5451SChristoph Hellwig static inline void ext4_blocks_count_set(struct ext4_super_block *es, 22723dcf5451SChristoph Hellwig ext4_fsblk_t blk) 22733dcf5451SChristoph Hellwig { 22743dcf5451SChristoph Hellwig es->s_blocks_count_lo = cpu_to_le32((u32)blk); 22753dcf5451SChristoph Hellwig es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 22763dcf5451SChristoph Hellwig } 22773dcf5451SChristoph Hellwig 22783dcf5451SChristoph Hellwig static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 22793dcf5451SChristoph Hellwig ext4_fsblk_t blk) 22803dcf5451SChristoph Hellwig { 22813dcf5451SChristoph Hellwig es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 22823dcf5451SChristoph Hellwig es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 22833dcf5451SChristoph Hellwig } 22843dcf5451SChristoph Hellwig 22853dcf5451SChristoph Hellwig static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 22863dcf5451SChristoph Hellwig ext4_fsblk_t blk) 22873dcf5451SChristoph Hellwig { 22883dcf5451SChristoph Hellwig es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 22893dcf5451SChristoph Hellwig es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 22903dcf5451SChristoph Hellwig } 22913dcf5451SChristoph Hellwig 22923dcf5451SChristoph Hellwig static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 22933dcf5451SChristoph Hellwig { 229406a279d6STheodore Ts'o if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 22953dcf5451SChristoph Hellwig return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 22963dcf5451SChristoph Hellwig le32_to_cpu(raw_inode->i_size_lo); 229706a279d6STheodore Ts'o else 229806a279d6STheodore Ts'o return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 22993dcf5451SChristoph Hellwig } 23003dcf5451SChristoph Hellwig 23013dcf5451SChristoph Hellwig static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 23023dcf5451SChristoph Hellwig { 23033dcf5451SChristoph Hellwig raw_inode->i_size_lo = cpu_to_le32(i_size); 23043dcf5451SChristoph Hellwig raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 23053dcf5451SChristoph Hellwig } 23063dcf5451SChristoph Hellwig 23073dcf5451SChristoph Hellwig static inline 23083dcf5451SChristoph Hellwig struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 23093dcf5451SChristoph Hellwig ext4_group_t group) 23103dcf5451SChristoph Hellwig { 23113dcf5451SChristoph Hellwig struct ext4_group_info ***grp_info; 23123dcf5451SChristoph Hellwig long indexv, indexh; 23133dcf5451SChristoph Hellwig grp_info = EXT4_SB(sb)->s_group_info; 23143dcf5451SChristoph Hellwig indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 23153dcf5451SChristoph Hellwig indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 23163dcf5451SChristoph Hellwig return grp_info[indexv][indexh]; 23173dcf5451SChristoph Hellwig } 23183dcf5451SChristoph Hellwig 23198df9675fSTheodore Ts'o /* 23208df9675fSTheodore Ts'o * Reading s_groups_count requires using smp_rmb() afterwards. See 23218df9675fSTheodore Ts'o * the locking protocol documented in the comments of ext4_group_add() 23228df9675fSTheodore Ts'o * in resize.c 23238df9675fSTheodore Ts'o */ 23248df9675fSTheodore Ts'o static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 23258df9675fSTheodore Ts'o { 23268df9675fSTheodore Ts'o ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 23278df9675fSTheodore Ts'o 23288df9675fSTheodore Ts'o smp_rmb(); 23298df9675fSTheodore Ts'o return ngroups; 23308df9675fSTheodore Ts'o } 23313dcf5451SChristoph Hellwig 2332772cb7c8SJose R. Santos static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2333772cb7c8SJose R. Santos ext4_group_t block_group) 2334772cb7c8SJose R. Santos { 2335772cb7c8SJose R. Santos return block_group >> sbi->s_log_groups_per_flex; 2336772cb7c8SJose R. Santos } 2337772cb7c8SJose R. Santos 2338772cb7c8SJose R. Santos static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2339772cb7c8SJose R. Santos { 2340772cb7c8SJose R. Santos return 1 << sbi->s_log_groups_per_flex; 2341772cb7c8SJose R. Santos } 2342772cb7c8SJose R. Santos 23433dcf5451SChristoph Hellwig #define ext4_std_error(sb, errno) \ 23443dcf5451SChristoph Hellwig do { \ 23453dcf5451SChristoph Hellwig if ((errno)) \ 2346c398eda0STheodore Ts'o __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 23473dcf5451SChristoph Hellwig } while (0) 23483dcf5451SChristoph Hellwig 2349a30d542aSAneesh Kumar K.V #ifdef CONFIG_SMP 2350df55c99dSTheodore Ts'o /* Each CPU can accumulate percpu_counter_batch clusters in their local 2351df55c99dSTheodore Ts'o * counters. So we need to make sure we have free clusters more 2352179f7ebfSEric Dumazet * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2353a30d542aSAneesh Kumar K.V */ 2354df55c99dSTheodore Ts'o #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2355a30d542aSAneesh Kumar K.V #else 2356df55c99dSTheodore Ts'o #define EXT4_FREECLUSTERS_WATERMARK 0 2357a30d542aSAneesh Kumar K.V #endif 2358a30d542aSAneesh Kumar K.V 2359cf17fea6SAneesh Kumar K.V static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2360cf17fea6SAneesh Kumar K.V { 2361cf17fea6SAneesh Kumar K.V /* 2362cf17fea6SAneesh Kumar K.V * XXX: replace with spinlock if seen contended -bzzz 2363cf17fea6SAneesh Kumar K.V */ 2364cf17fea6SAneesh Kumar K.V down_write(&EXT4_I(inode)->i_data_sem); 2365cf17fea6SAneesh Kumar K.V if (newsize > EXT4_I(inode)->i_disksize) 2366cf17fea6SAneesh Kumar K.V EXT4_I(inode)->i_disksize = newsize; 2367cf17fea6SAneesh Kumar K.V up_write(&EXT4_I(inode)->i_data_sem); 2368cf17fea6SAneesh Kumar K.V return ; 2369cf17fea6SAneesh Kumar K.V } 2370a30d542aSAneesh Kumar K.V 23715d1b1b3fSAneesh Kumar K.V struct ext4_group_info { 23725d1b1b3fSAneesh Kumar K.V unsigned long bb_state; 23735d1b1b3fSAneesh Kumar K.V struct rb_root bb_free_root; 2374a36b4498SEric Sandeen ext4_grpblk_t bb_first_free; /* first free block */ 2375a36b4498SEric Sandeen ext4_grpblk_t bb_free; /* total free blocks */ 2376a36b4498SEric Sandeen ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 23778a57d9d6SCurt Wohlgemuth ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 23785d1b1b3fSAneesh Kumar K.V struct list_head bb_prealloc_list; 23795d1b1b3fSAneesh Kumar K.V #ifdef DOUBLE_CHECK 23805d1b1b3fSAneesh Kumar K.V void *bb_bitmap; 23815d1b1b3fSAneesh Kumar K.V #endif 23825d1b1b3fSAneesh Kumar K.V struct rw_semaphore alloc_sem; 2383a36b4498SEric Sandeen ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2384a36b4498SEric Sandeen * regions, index is order. 2385a36b4498SEric Sandeen * bb_counters[3] = 5 means 2386a36b4498SEric Sandeen * 5 free 8-block regions. */ 23875d1b1b3fSAneesh Kumar K.V }; 23885d1b1b3fSAneesh Kumar K.V 23895d1b1b3fSAneesh Kumar K.V #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 23903d56b8d2STao Ma #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 23915d1b1b3fSAneesh Kumar K.V 23925d1b1b3fSAneesh Kumar K.V #define EXT4_MB_GRP_NEED_INIT(grp) \ 23935d1b1b3fSAneesh Kumar K.V (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 23945d1b1b3fSAneesh Kumar K.V 23953d56b8d2STao Ma #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 23963d56b8d2STao Ma (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 23973d56b8d2STao Ma #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 23983d56b8d2STao Ma (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 23993d56b8d2STao Ma #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 24003d56b8d2STao Ma (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 24013d56b8d2STao Ma 240250797481STheodore Ts'o #define EXT4_MAX_CONTENTION 8 240350797481STheodore Ts'o #define EXT4_CONTENTION_THRESHOLD 2 240450797481STheodore Ts'o 2405955ce5f5SAneesh Kumar K.V static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2406955ce5f5SAneesh Kumar K.V ext4_group_t group) 2407955ce5f5SAneesh Kumar K.V { 2408955ce5f5SAneesh Kumar K.V return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2409955ce5f5SAneesh Kumar K.V } 2410955ce5f5SAneesh Kumar K.V 241150797481STheodore Ts'o /* 241250797481STheodore Ts'o * Returns true if the filesystem is busy enough that attempts to 241350797481STheodore Ts'o * access the block group locks has run into contention. 241450797481STheodore Ts'o */ 241550797481STheodore Ts'o static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 241650797481STheodore Ts'o { 241750797481STheodore Ts'o return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 241850797481STheodore Ts'o } 241950797481STheodore Ts'o 24205d1b1b3fSAneesh Kumar K.V static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 24215d1b1b3fSAneesh Kumar K.V { 242250797481STheodore Ts'o spinlock_t *lock = ext4_group_lock_ptr(sb, group); 242350797481STheodore Ts'o if (spin_trylock(lock)) 242450797481STheodore Ts'o /* 242550797481STheodore Ts'o * We're able to grab the lock right away, so drop the 242650797481STheodore Ts'o * lock contention counter. 242750797481STheodore Ts'o */ 242850797481STheodore Ts'o atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 242950797481STheodore Ts'o else { 243050797481STheodore Ts'o /* 243150797481STheodore Ts'o * The lock is busy, so bump the contention counter, 243250797481STheodore Ts'o * and then wait on the spin lock. 243350797481STheodore Ts'o */ 243450797481STheodore Ts'o atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 243550797481STheodore Ts'o EXT4_MAX_CONTENTION); 243650797481STheodore Ts'o spin_lock(lock); 243750797481STheodore Ts'o } 24385d1b1b3fSAneesh Kumar K.V } 24395d1b1b3fSAneesh Kumar K.V 24405d1b1b3fSAneesh Kumar K.V static inline void ext4_unlock_group(struct super_block *sb, 24415d1b1b3fSAneesh Kumar K.V ext4_group_t group) 24425d1b1b3fSAneesh Kumar K.V { 2443955ce5f5SAneesh Kumar K.V spin_unlock(ext4_group_lock_ptr(sb, group)); 24445d1b1b3fSAneesh Kumar K.V } 24455d1b1b3fSAneesh Kumar K.V 24463dcf5451SChristoph Hellwig /* 24471f7d1e77STheodore Ts'o * Block validity checking 24481f7d1e77STheodore Ts'o */ 24491f7d1e77STheodore Ts'o #define ext4_check_indirect_blockref(inode, bh) \ 24501f7d1e77STheodore Ts'o ext4_check_blockref(__func__, __LINE__, inode, \ 24511f7d1e77STheodore Ts'o (__le32 *)(bh)->b_data, \ 24521f7d1e77STheodore Ts'o EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 24531f7d1e77STheodore Ts'o 24541f7d1e77STheodore Ts'o #define ext4_ind_check_inode(inode) \ 24551f7d1e77STheodore Ts'o ext4_check_blockref(__func__, __LINE__, inode, \ 24561f7d1e77STheodore Ts'o EXT4_I(inode)->i_data, \ 24571f7d1e77STheodore Ts'o EXT4_NDIR_BLOCKS) 24581f7d1e77STheodore Ts'o 24591f7d1e77STheodore Ts'o /* 24603dcf5451SChristoph Hellwig * Inodes and files operations 24613dcf5451SChristoph Hellwig */ 24623dcf5451SChristoph Hellwig 24633dcf5451SChristoph Hellwig /* dir.c */ 24643dcf5451SChristoph Hellwig extern const struct file_operations ext4_dir_operations; 24653dcf5451SChristoph Hellwig 24663dcf5451SChristoph Hellwig /* file.c */ 24673dcf5451SChristoph Hellwig extern const struct inode_operations ext4_file_inode_operations; 24683dcf5451SChristoph Hellwig extern const struct file_operations ext4_file_operations; 2469e0d10bfaSToshiyuki Okajima extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2470c278531dSDmitry Monakhov extern void ext4_unwritten_wait(struct inode *inode); 24713dcf5451SChristoph Hellwig 247295eaefbdSTheodore Ts'o /* inline.c */ 247395eaefbdSTheodore Ts'o extern int ext4_has_inline_data(struct inode *inode); 247495eaefbdSTheodore Ts'o extern int ext4_get_inline_size(struct inode *inode); 247595eaefbdSTheodore Ts'o extern int ext4_get_max_inline_size(struct inode *inode); 247695eaefbdSTheodore Ts'o extern int ext4_find_inline_data_nolock(struct inode *inode); 247795eaefbdSTheodore Ts'o extern void ext4_write_inline_data(struct inode *inode, 247895eaefbdSTheodore Ts'o struct ext4_iloc *iloc, 247995eaefbdSTheodore Ts'o void *buffer, loff_t pos, 248095eaefbdSTheodore Ts'o unsigned int len); 248195eaefbdSTheodore Ts'o extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode, 248295eaefbdSTheodore Ts'o unsigned int len); 248395eaefbdSTheodore Ts'o extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 248495eaefbdSTheodore Ts'o unsigned int len); 248595eaefbdSTheodore Ts'o extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 248695eaefbdSTheodore Ts'o 248795eaefbdSTheodore Ts'o extern int ext4_readpage_inline(struct inode *inode, struct page *page); 248895eaefbdSTheodore Ts'o extern int ext4_try_to_write_inline_data(struct address_space *mapping, 248995eaefbdSTheodore Ts'o struct inode *inode, 249095eaefbdSTheodore Ts'o loff_t pos, unsigned len, 249195eaefbdSTheodore Ts'o unsigned flags, 249295eaefbdSTheodore Ts'o struct page **pagep); 249395eaefbdSTheodore Ts'o extern int ext4_write_inline_data_end(struct inode *inode, 249495eaefbdSTheodore Ts'o loff_t pos, unsigned len, 249595eaefbdSTheodore Ts'o unsigned copied, 249695eaefbdSTheodore Ts'o struct page *page); 249795eaefbdSTheodore Ts'o extern struct buffer_head * 249895eaefbdSTheodore Ts'o ext4_journalled_write_inline_data(struct inode *inode, 249995eaefbdSTheodore Ts'o unsigned len, 250095eaefbdSTheodore Ts'o struct page *page); 250195eaefbdSTheodore Ts'o extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 250295eaefbdSTheodore Ts'o struct inode *inode, 250395eaefbdSTheodore Ts'o loff_t pos, unsigned len, 250495eaefbdSTheodore Ts'o unsigned flags, 250595eaefbdSTheodore Ts'o struct page **pagep, 250695eaefbdSTheodore Ts'o void **fsdata); 250795eaefbdSTheodore Ts'o extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 250895eaefbdSTheodore Ts'o unsigned len, unsigned copied, 250995eaefbdSTheodore Ts'o struct page *page); 251095eaefbdSTheodore Ts'o extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry, 251195eaefbdSTheodore Ts'o struct inode *inode); 251295eaefbdSTheodore Ts'o extern int ext4_try_create_inline_dir(handle_t *handle, 251395eaefbdSTheodore Ts'o struct inode *parent, 251495eaefbdSTheodore Ts'o struct inode *inode); 251595eaefbdSTheodore Ts'o extern int ext4_read_inline_dir(struct file *filp, 251695eaefbdSTheodore Ts'o void *dirent, filldir_t filldir, 251795eaefbdSTheodore Ts'o int *has_inline_data); 25188af0f082STao Ma extern int htree_inlinedir_to_tree(struct file *dir_file, 25198af0f082STao Ma struct inode *dir, ext4_lblk_t block, 25208af0f082STao Ma struct dx_hash_info *hinfo, 25218af0f082STao Ma __u32 start_hash, __u32 start_minor_hash, 25228af0f082STao Ma int *has_inline_data); 252395eaefbdSTheodore Ts'o extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 252495eaefbdSTheodore Ts'o const struct qstr *d_name, 252595eaefbdSTheodore Ts'o struct ext4_dir_entry_2 **res_dir, 252695eaefbdSTheodore Ts'o int *has_inline_data); 252795eaefbdSTheodore Ts'o extern int ext4_delete_inline_entry(handle_t *handle, 252895eaefbdSTheodore Ts'o struct inode *dir, 252995eaefbdSTheodore Ts'o struct ext4_dir_entry_2 *de_del, 253095eaefbdSTheodore Ts'o struct buffer_head *bh, 253195eaefbdSTheodore Ts'o int *has_inline_data); 253295eaefbdSTheodore Ts'o extern int empty_inline_dir(struct inode *dir, int *has_inline_data); 253395eaefbdSTheodore Ts'o extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 253495eaefbdSTheodore Ts'o struct ext4_dir_entry_2 **parent_de, 253595eaefbdSTheodore Ts'o int *retval); 253695eaefbdSTheodore Ts'o extern int ext4_inline_data_fiemap(struct inode *inode, 253795eaefbdSTheodore Ts'o struct fiemap_extent_info *fieinfo, 253895eaefbdSTheodore Ts'o int *has_inline); 253995eaefbdSTheodore Ts'o extern int ext4_try_to_evict_inline_data(handle_t *handle, 254095eaefbdSTheodore Ts'o struct inode *inode, 254195eaefbdSTheodore Ts'o int needed); 254295eaefbdSTheodore Ts'o extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 254395eaefbdSTheodore Ts'o 254495eaefbdSTheodore Ts'o extern int ext4_convert_inline_data(struct inode *inode); 254595eaefbdSTheodore Ts'o 25463dcf5451SChristoph Hellwig /* namei.c */ 25473dcf5451SChristoph Hellwig extern const struct inode_operations ext4_dir_inode_operations; 25483dcf5451SChristoph Hellwig extern const struct inode_operations ext4_special_inode_operations; 2549596397b7STheodore Ts'o extern struct dentry *ext4_get_parent(struct dentry *child); 2550a774f9c2STao Ma extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 2551a774f9c2STao Ma struct ext4_dir_entry_2 *de, 2552a774f9c2STao Ma int blocksize, int csum_size, 2553a774f9c2STao Ma unsigned int parent_ino, int dotdot_real_len); 25543c47d541STao Ma extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 25553c47d541STao Ma unsigned int blocksize); 25563c47d541STao Ma extern int ext4_handle_dirty_dirent_node(handle_t *handle, 25573c47d541STao Ma struct inode *inode, 25583c47d541STao Ma struct buffer_head *bh); 25598af0f082STao Ma #define S_SHIFT 12 25608af0f082STao Ma static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 25618af0f082STao Ma [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 25628af0f082STao Ma [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 25638af0f082STao Ma [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 25648af0f082STao Ma [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 25658af0f082STao Ma [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 25668af0f082STao Ma [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 25678af0f082STao Ma [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 25688af0f082STao Ma }; 25698af0f082STao Ma 25708af0f082STao Ma static inline void ext4_set_de_type(struct super_block *sb, 25718af0f082STao Ma struct ext4_dir_entry_2 *de, 25728af0f082STao Ma umode_t mode) { 25738af0f082STao Ma if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE)) 25748af0f082STao Ma de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 25758af0f082STao Ma } 25768af0f082STao Ma 25773dcf5451SChristoph Hellwig 25783dcf5451SChristoph Hellwig /* symlink.c */ 25793dcf5451SChristoph Hellwig extern const struct inode_operations ext4_symlink_inode_operations; 25803dcf5451SChristoph Hellwig extern const struct inode_operations ext4_fast_symlink_inode_operations; 25813dcf5451SChristoph Hellwig 25826fd058f7STheodore Ts'o /* block_validity */ 25836fd058f7STheodore Ts'o extern void ext4_release_system_zone(struct super_block *sb); 25846fd058f7STheodore Ts'o extern int ext4_setup_system_zone(struct super_block *sb); 25855dabfc78STheodore Ts'o extern int __init ext4_init_system_zone(void); 25865dabfc78STheodore Ts'o extern void ext4_exit_system_zone(void); 25876fd058f7STheodore Ts'o extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 25886fd058f7STheodore Ts'o ext4_fsblk_t start_blk, 25896fd058f7STheodore Ts'o unsigned int count); 25901f7d1e77STheodore Ts'o extern int ext4_check_blockref(const char *, unsigned int, 25911f7d1e77STheodore Ts'o struct inode *, __le32 *, unsigned int); 25926fd058f7STheodore Ts'o 25933dcf5451SChristoph Hellwig /* extents.c */ 25944a092d73STheodore Ts'o struct ext4_ext_path; 25954a092d73STheodore Ts'o struct ext4_extent; 25964a092d73STheodore Ts'o 25973dcf5451SChristoph Hellwig extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 25983dcf5451SChristoph Hellwig extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2599fffb2739SJan Kara extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 2600e35fd660STheodore Ts'o extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2601e35fd660STheodore Ts'o struct ext4_map_blocks *map, int flags); 2602819c4920STheodore Ts'o extern void ext4_ext_truncate(handle_t *, struct inode *); 260326a4c0c6STheodore Ts'o extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 260426a4c0c6STheodore Ts'o ext4_lblk_t end); 26053dcf5451SChristoph Hellwig extern void ext4_ext_init(struct super_block *); 26063dcf5451SChristoph Hellwig extern void ext4_ext_release(struct super_block *); 26072fe17c10SChristoph Hellwig extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 26083dcf5451SChristoph Hellwig loff_t len); 26090031462bSMingming Cao extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, 2610a1de02dcSEric Sandeen ssize_t len); 2611e35fd660STheodore Ts'o extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2612e35fd660STheodore Ts'o struct ext4_map_blocks *map, int flags); 26134a092d73STheodore Ts'o extern int ext4_ext_calc_metadata_amount(struct inode *inode, 26144a092d73STheodore Ts'o ext4_lblk_t lblocks); 26154a092d73STheodore Ts'o extern int ext4_extent_tree_init(handle_t *, struct inode *); 26164a092d73STheodore Ts'o extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 26174a092d73STheodore Ts'o int num, 26184a092d73STheodore Ts'o struct ext4_ext_path *path); 26194a092d73STheodore Ts'o extern int ext4_can_extents_be_merged(struct inode *inode, 26204a092d73STheodore Ts'o struct ext4_extent *ex1, 26214a092d73STheodore Ts'o struct ext4_extent *ex2); 26224a092d73STheodore Ts'o extern int ext4_ext_insert_extent(handle_t *, struct inode *, 26234a092d73STheodore Ts'o struct ext4_ext_path *, 26244a092d73STheodore Ts'o struct ext4_extent *, int); 26254a092d73STheodore Ts'o extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t, 26264a092d73STheodore Ts'o struct ext4_ext_path *); 26274a092d73STheodore Ts'o extern void ext4_ext_drop_refs(struct ext4_ext_path *); 26284a092d73STheodore Ts'o extern int ext4_ext_check_inode(struct inode *inode); 2629f7fec032SZheng Liu extern int ext4_find_delalloc_range(struct inode *inode, 2630f7fec032SZheng Liu ext4_lblk_t lblk_start, 2631f7fec032SZheng Liu ext4_lblk_t lblk_end); 26324a092d73STheodore Ts'o extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 26333a06d778SAneesh Kumar K.V extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 26343a06d778SAneesh Kumar K.V __u64 start, __u64 len); 26354a092d73STheodore Ts'o 26364a092d73STheodore Ts'o 2637748de673SAkira Fujita /* move_extent.c */ 2638393d1d1dSDr. Tilmann Bubeck extern void ext4_double_down_write_data_sem(struct inode *first, 2639393d1d1dSDr. Tilmann Bubeck struct inode *second); 2640393d1d1dSDr. Tilmann Bubeck extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 2641393d1d1dSDr. Tilmann Bubeck struct inode *donor_inode); 2642393d1d1dSDr. Tilmann Bubeck void ext4_inode_double_lock(struct inode *inode1, struct inode *inode2); 2643393d1d1dSDr. Tilmann Bubeck void ext4_inode_double_unlock(struct inode *inode1, struct inode *inode2); 2644748de673SAkira Fujita extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2645748de673SAkira Fujita __u64 start_orig, __u64 start_donor, 2646748de673SAkira Fujita __u64 len, __u64 *moved_len); 2647748de673SAkira Fujita 2648bd2d0210STheodore Ts'o /* page-io.c */ 26495dabfc78STheodore Ts'o extern int __init ext4_init_pageio(void); 26505dabfc78STheodore Ts'o extern void ext4_exit_pageio(void); 26511ada47d9STheodore Ts'o extern void ext4_ioend_shutdown(struct inode *); 2652bd2d0210STheodore Ts'o extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 265397a851edSJan Kara extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 265497a851edSJan Kara extern int ext4_put_io_end(ext4_io_end_t *io_end); 265597a851edSJan Kara extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 265697a851edSJan Kara extern void ext4_io_submit_init(struct ext4_io_submit *io, 265797a851edSJan Kara struct writeback_control *wbc); 265884c17543SJan Kara extern void ext4_end_io_work(struct work_struct *work); 2659bd2d0210STheodore Ts'o extern void ext4_io_submit(struct ext4_io_submit *io); 2660bd2d0210STheodore Ts'o extern int ext4_bio_write_page(struct ext4_io_submit *io, 2661bd2d0210STheodore Ts'o struct page *page, 2662bd2d0210STheodore Ts'o int len, 2663bd2d0210STheodore Ts'o struct writeback_control *wbc); 26643a06d778SAneesh Kumar K.V 2665c5e06d10SJohann Lombardi /* mmp.c */ 2666c5e06d10SJohann Lombardi extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 26675c359a47SDarrick J. Wong extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp); 26685c359a47SDarrick J. Wong extern int ext4_mmp_csum_verify(struct super_block *sb, 26695c359a47SDarrick J. Wong struct mmp_struct *mmp); 2670c5e06d10SJohann Lombardi 2671744692dcSJiaying Zhang /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ 2672744692dcSJiaying Zhang enum ext4_state_bits { 2673744692dcSJiaying Zhang BH_Uninit /* blocks are allocated but uninitialized on disk */ 2674744692dcSJiaying Zhang = BH_JBDPrivateStart, 26757b415bf6SAditya Kali BH_AllocFromCluster, /* allocated blocks were part of already 26767b415bf6SAditya Kali * allocated cluster. Note that this flag will 26777b415bf6SAditya Kali * never, ever appear in a buffer_head's state 26787b415bf6SAditya Kali * flag. See EXT4_MAP_FROM_CLUSTER to see where 26797b415bf6SAditya Kali * this is used. */ 2680744692dcSJiaying Zhang }; 2681744692dcSJiaying Zhang 2682744692dcSJiaying Zhang BUFFER_FNS(Uninit, uninit) 2683744692dcSJiaying Zhang TAS_BUFFER_FNS(Uninit, uninit) 2684744692dcSJiaying Zhang 26852ccb5fb9SAneesh Kumar K.V /* 268648fc7f7eSAdam Buchbinder * Add new method to test whether block and inode bitmaps are properly 26872ccb5fb9SAneesh Kumar K.V * initialized. With uninit_bg reading the block from disk is not enough 26882ccb5fb9SAneesh Kumar K.V * to mark the bitmap uptodate. We need to also zero-out the bitmap 26892ccb5fb9SAneesh Kumar K.V */ 26902ccb5fb9SAneesh Kumar K.V #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 26912ccb5fb9SAneesh Kumar K.V 26922ccb5fb9SAneesh Kumar K.V static inline int bitmap_uptodate(struct buffer_head *bh) 26932ccb5fb9SAneesh Kumar K.V { 26942ccb5fb9SAneesh Kumar K.V return (buffer_uptodate(bh) && 26952ccb5fb9SAneesh Kumar K.V test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 26962ccb5fb9SAneesh Kumar K.V } 26972ccb5fb9SAneesh Kumar K.V static inline void set_bitmap_uptodate(struct buffer_head *bh) 26982ccb5fb9SAneesh Kumar K.V { 26992ccb5fb9SAneesh Kumar K.V set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 27002ccb5fb9SAneesh Kumar K.V } 27012ccb5fb9SAneesh Kumar K.V 270217335dccSDmitry Monakhov /* 270317335dccSDmitry Monakhov * Disable DIO read nolock optimization, so new dioreaders will be forced 270417335dccSDmitry Monakhov * to grab i_mutex 270517335dccSDmitry Monakhov */ 270617335dccSDmitry Monakhov static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 270717335dccSDmitry Monakhov { 270817335dccSDmitry Monakhov ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 270917335dccSDmitry Monakhov smp_mb(); 271017335dccSDmitry Monakhov } 271117335dccSDmitry Monakhov static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 271217335dccSDmitry Monakhov { 271317335dccSDmitry Monakhov smp_mb(); 271417335dccSDmitry Monakhov ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 271517335dccSDmitry Monakhov } 271617335dccSDmitry Monakhov 2717731eb1a0SAkinobu Mita #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 2718731eb1a0SAkinobu Mita 2719e9e3bcecSEric Sandeen /* For ioend & aio unwritten conversion wait queues */ 2720e9e3bcecSEric Sandeen #define EXT4_WQ_HASH_SZ 37 2721e9e3bcecSEric Sandeen #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 2722e9e3bcecSEric Sandeen EXT4_WQ_HASH_SZ]) 2723e9e3bcecSEric Sandeen #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 2724e9e3bcecSEric Sandeen EXT4_WQ_HASH_SZ]) 2725e9e3bcecSEric Sandeen extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 2726e9e3bcecSEric Sandeen extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 2727e9e3bcecSEric Sandeen 27288f82f840SYongqiang Yang #define EXT4_RESIZING 0 27298f82f840SYongqiang Yang extern int ext4_resize_begin(struct super_block *sb); 27308f82f840SYongqiang Yang extern void ext4_resize_end(struct super_block *sb); 27318f82f840SYongqiang Yang 27323dcf5451SChristoph Hellwig #endif /* __KERNEL__ */ 27333dcf5451SChristoph Hellwig 27343dcf5451SChristoph Hellwig #endif /* _EXT4_H */ 2735