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> 323dcf5451SChristoph Hellwig 333dcf5451SChristoph Hellwig /* 348a35694eSShen Feng * The fourth extended filesystem constants/structures 353dcf5451SChristoph Hellwig */ 363dcf5451SChristoph Hellwig 373dcf5451SChristoph Hellwig /* 383dcf5451SChristoph Hellwig * Define EXT4FS_DEBUG to produce debug messages 393dcf5451SChristoph Hellwig */ 403dcf5451SChristoph Hellwig #undef EXT4FS_DEBUG 413dcf5451SChristoph Hellwig 423dcf5451SChristoph Hellwig /* 433dcf5451SChristoph Hellwig * Debug code 443dcf5451SChristoph Hellwig */ 453dcf5451SChristoph Hellwig #ifdef EXT4FS_DEBUG 463dcf5451SChristoph Hellwig #define ext4_debug(f, a...) \ 473dcf5451SChristoph Hellwig do { \ 483dcf5451SChristoph Hellwig printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 494db9c54aSStoyan Gaydarov __FILE__, __LINE__, __func__); \ 503dcf5451SChristoph Hellwig printk(KERN_DEBUG f, ## a); \ 513dcf5451SChristoph Hellwig } while (0) 523dcf5451SChristoph Hellwig #else 533dcf5451SChristoph Hellwig #define ext4_debug(f, a...) do {} while (0) 543dcf5451SChristoph Hellwig #endif 553dcf5451SChristoph Hellwig 56d444c3c3STheodore Ts'o /* data type for block offset of block group */ 57d444c3c3STheodore Ts'o typedef int ext4_grpblk_t; 58d444c3c3STheodore Ts'o 59d444c3c3STheodore Ts'o /* data type for filesystem-wide blocks number */ 60d444c3c3STheodore Ts'o typedef unsigned long long ext4_fsblk_t; 61d444c3c3STheodore Ts'o 62d444c3c3STheodore Ts'o /* data type for file logical block number */ 63d444c3c3STheodore Ts'o typedef __u32 ext4_lblk_t; 64d444c3c3STheodore Ts'o 65d444c3c3STheodore Ts'o /* data type for block group number */ 66d444c3c3STheodore Ts'o typedef unsigned int ext4_group_t; 67d444c3c3STheodore Ts'o 68d444c3c3STheodore Ts'o 693dcf5451SChristoph Hellwig /* prefer goal again. length */ 700ef90db9STheodore Ts'o #define EXT4_MB_HINT_MERGE 0x0001 713dcf5451SChristoph Hellwig /* blocks already reserved */ 720ef90db9STheodore Ts'o #define EXT4_MB_HINT_RESERVED 0x0002 733dcf5451SChristoph Hellwig /* metadata is being allocated */ 740ef90db9STheodore Ts'o #define EXT4_MB_HINT_METADATA 0x0004 753dcf5451SChristoph Hellwig /* first blocks in the file */ 760ef90db9STheodore Ts'o #define EXT4_MB_HINT_FIRST 0x0008 773dcf5451SChristoph Hellwig /* search for the best chunk */ 780ef90db9STheodore Ts'o #define EXT4_MB_HINT_BEST 0x0010 793dcf5451SChristoph Hellwig /* data is being allocated */ 800ef90db9STheodore Ts'o #define EXT4_MB_HINT_DATA 0x0020 813dcf5451SChristoph Hellwig /* don't preallocate (for tails) */ 820ef90db9STheodore Ts'o #define EXT4_MB_HINT_NOPREALLOC 0x0040 833dcf5451SChristoph Hellwig /* allocate for locality group */ 840ef90db9STheodore Ts'o #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 853dcf5451SChristoph Hellwig /* allocate goal blocks or none */ 860ef90db9STheodore Ts'o #define EXT4_MB_HINT_GOAL_ONLY 0x0100 873dcf5451SChristoph Hellwig /* goal is meaningful */ 880ef90db9STheodore Ts'o #define EXT4_MB_HINT_TRY_GOAL 0x0200 89d2a17637SMingming Cao /* blocks already pre-reserved by delayed allocation */ 900ef90db9STheodore Ts'o #define EXT4_MB_DELALLOC_RESERVED 0x0400 91d2a17637SMingming Cao 923dcf5451SChristoph Hellwig 933dcf5451SChristoph Hellwig struct ext4_allocation_request { 943dcf5451SChristoph Hellwig /* target inode for block we're allocating */ 953dcf5451SChristoph Hellwig struct inode *inode; 963dcf5451SChristoph Hellwig /* how many blocks we want to allocate */ 97498e5f24STheodore Ts'o unsigned int len; 98726447d8SEric Sandeen /* logical block in target inode */ 99726447d8SEric Sandeen ext4_lblk_t logical; 100726447d8SEric Sandeen /* the closest logical allocated block to the left */ 101726447d8SEric Sandeen ext4_lblk_t lleft; 102726447d8SEric Sandeen /* the closest logical allocated block to the right */ 103726447d8SEric Sandeen ext4_lblk_t lright; 104726447d8SEric Sandeen /* phys. target (a hint) */ 105726447d8SEric Sandeen ext4_fsblk_t goal; 106726447d8SEric Sandeen /* phys. block for the closest logical allocated block to the left */ 107726447d8SEric Sandeen ext4_fsblk_t pleft; 108726447d8SEric Sandeen /* phys. block for the closest logical allocated block to the right */ 109726447d8SEric Sandeen ext4_fsblk_t pright; 1103dcf5451SChristoph Hellwig /* flags. see above EXT4_MB_HINT_* */ 111498e5f24STheodore Ts'o unsigned int flags; 1123dcf5451SChristoph Hellwig }; 1133dcf5451SChristoph Hellwig 1143dcf5451SChristoph Hellwig /* 1153dcf5451SChristoph Hellwig * Special inodes numbers 1163dcf5451SChristoph Hellwig */ 1173dcf5451SChristoph Hellwig #define EXT4_BAD_INO 1 /* Bad blocks inode */ 1183dcf5451SChristoph Hellwig #define EXT4_ROOT_INO 2 /* Root inode */ 1193dcf5451SChristoph Hellwig #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 1203dcf5451SChristoph Hellwig #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 1213dcf5451SChristoph Hellwig #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 1223dcf5451SChristoph Hellwig #define EXT4_JOURNAL_INO 8 /* Journal inode */ 1233dcf5451SChristoph Hellwig 1243dcf5451SChristoph Hellwig /* First non-reserved inode for old ext4 filesystems */ 1253dcf5451SChristoph Hellwig #define EXT4_GOOD_OLD_FIRST_INO 11 1263dcf5451SChristoph Hellwig 1273dcf5451SChristoph Hellwig /* 1283dcf5451SChristoph Hellwig * Maximal count of links to a file 1293dcf5451SChristoph Hellwig */ 1303dcf5451SChristoph Hellwig #define EXT4_LINK_MAX 65000 1313dcf5451SChristoph Hellwig 1323dcf5451SChristoph Hellwig /* 1333dcf5451SChristoph Hellwig * Macro-instructions used to manage several block sizes 1343dcf5451SChristoph Hellwig */ 1353dcf5451SChristoph Hellwig #define EXT4_MIN_BLOCK_SIZE 1024 1363dcf5451SChristoph Hellwig #define EXT4_MAX_BLOCK_SIZE 65536 1373dcf5451SChristoph Hellwig #define EXT4_MIN_BLOCK_LOG_SIZE 10 1383dcf5451SChristoph Hellwig #ifdef __KERNEL__ 1393dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 1403dcf5451SChristoph Hellwig #else 1413dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 1423dcf5451SChristoph Hellwig #endif 1433dcf5451SChristoph Hellwig #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 1443dcf5451SChristoph Hellwig #ifdef __KERNEL__ 1453dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 1463dcf5451SChristoph Hellwig #else 1473dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 1483dcf5451SChristoph Hellwig #endif 1493dcf5451SChristoph Hellwig #ifdef __KERNEL__ 1503dcf5451SChristoph Hellwig #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 1513dcf5451SChristoph Hellwig #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 1523dcf5451SChristoph Hellwig #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 1533dcf5451SChristoph Hellwig #else 1543dcf5451SChristoph Hellwig #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 1553dcf5451SChristoph Hellwig EXT4_GOOD_OLD_INODE_SIZE : \ 1563dcf5451SChristoph Hellwig (s)->s_inode_size) 1573dcf5451SChristoph Hellwig #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 1583dcf5451SChristoph Hellwig EXT4_GOOD_OLD_FIRST_INO : \ 1593dcf5451SChristoph Hellwig (s)->s_first_ino) 1603dcf5451SChristoph Hellwig #endif 1613dcf5451SChristoph Hellwig #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 1623dcf5451SChristoph Hellwig 1633dcf5451SChristoph Hellwig /* 1643dcf5451SChristoph Hellwig * Structure of a blocks group descriptor 1653dcf5451SChristoph Hellwig */ 1663dcf5451SChristoph Hellwig struct ext4_group_desc 1673dcf5451SChristoph Hellwig { 1683dcf5451SChristoph Hellwig __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 1693dcf5451SChristoph Hellwig __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 1703dcf5451SChristoph Hellwig __le32 bg_inode_table_lo; /* Inodes table block */ 171560671a0SAneesh Kumar K.V __le16 bg_free_blocks_count_lo;/* Free blocks count */ 172560671a0SAneesh Kumar K.V __le16 bg_free_inodes_count_lo;/* Free inodes count */ 173560671a0SAneesh Kumar K.V __le16 bg_used_dirs_count_lo; /* Directories count */ 1743dcf5451SChristoph Hellwig __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 1753dcf5451SChristoph Hellwig __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 176560671a0SAneesh Kumar K.V __le16 bg_itable_unused_lo; /* Unused inodes count */ 1773dcf5451SChristoph Hellwig __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 1783dcf5451SChristoph Hellwig __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 1793dcf5451SChristoph Hellwig __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 1803dcf5451SChristoph Hellwig __le32 bg_inode_table_hi; /* Inodes table block MSB */ 1813dcf5451SChristoph Hellwig __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 1823dcf5451SChristoph Hellwig __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 1833dcf5451SChristoph Hellwig __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 1843dcf5451SChristoph Hellwig __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 1853dcf5451SChristoph Hellwig __u32 bg_reserved2[3]; 1863dcf5451SChristoph Hellwig }; 1873dcf5451SChristoph Hellwig 188772cb7c8SJose R. Santos /* 189772cb7c8SJose R. Santos * Structure of a flex block group info 190772cb7c8SJose R. Santos */ 191772cb7c8SJose R. Santos 192772cb7c8SJose R. Santos struct flex_groups { 1939f24e420STheodore Ts'o atomic_t free_inodes; 1949f24e420STheodore Ts'o atomic_t free_blocks; 1957d39db14STheodore Ts'o atomic_t used_dirs; 196772cb7c8SJose R. Santos }; 197772cb7c8SJose R. Santos 1983dcf5451SChristoph Hellwig #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 1993dcf5451SChristoph Hellwig #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 2003dcf5451SChristoph Hellwig #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 2013dcf5451SChristoph Hellwig 2023dcf5451SChristoph Hellwig /* 2033dcf5451SChristoph Hellwig * Macro-instructions used to manage group descriptors 2043dcf5451SChristoph Hellwig */ 2053dcf5451SChristoph Hellwig #define EXT4_MIN_DESC_SIZE 32 2063dcf5451SChristoph Hellwig #define EXT4_MIN_DESC_SIZE_64BIT 64 2073dcf5451SChristoph Hellwig #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 2083dcf5451SChristoph Hellwig #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 2093dcf5451SChristoph Hellwig #ifdef __KERNEL__ 2103dcf5451SChristoph Hellwig # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 2113dcf5451SChristoph Hellwig # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 2123dcf5451SChristoph Hellwig # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 2133dcf5451SChristoph Hellwig # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 2143dcf5451SChristoph Hellwig #else 2153dcf5451SChristoph Hellwig # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 2163dcf5451SChristoph Hellwig # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 2173dcf5451SChristoph Hellwig # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 2183dcf5451SChristoph Hellwig #endif 2193dcf5451SChristoph Hellwig 2203dcf5451SChristoph Hellwig /* 2213dcf5451SChristoph Hellwig * Constants relative to the data blocks 2223dcf5451SChristoph Hellwig */ 2233dcf5451SChristoph Hellwig #define EXT4_NDIR_BLOCKS 12 2243dcf5451SChristoph Hellwig #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 2253dcf5451SChristoph Hellwig #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 2263dcf5451SChristoph Hellwig #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 2273dcf5451SChristoph Hellwig #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 2283dcf5451SChristoph Hellwig 2293dcf5451SChristoph Hellwig /* 2303dcf5451SChristoph Hellwig * Inode flags 2313dcf5451SChristoph Hellwig */ 2323dcf5451SChristoph Hellwig #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 2333dcf5451SChristoph Hellwig #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 2343dcf5451SChristoph Hellwig #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 2353dcf5451SChristoph Hellwig #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 2363dcf5451SChristoph Hellwig #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 2373dcf5451SChristoph Hellwig #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 2383dcf5451SChristoph Hellwig #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 2393dcf5451SChristoph Hellwig #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 2403dcf5451SChristoph Hellwig /* Reserved for compression usage... */ 2413dcf5451SChristoph Hellwig #define EXT4_DIRTY_FL 0x00000100 2423dcf5451SChristoph Hellwig #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 2433dcf5451SChristoph Hellwig #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 2443dcf5451SChristoph Hellwig #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 2453dcf5451SChristoph Hellwig /* End compression flags --- maybe not all used */ 2463dcf5451SChristoph Hellwig #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 2473dcf5451SChristoph Hellwig #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 2483dcf5451SChristoph Hellwig #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 2493dcf5451SChristoph Hellwig #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 2503dcf5451SChristoph Hellwig #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 2513dcf5451SChristoph Hellwig #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 2523dcf5451SChristoph Hellwig #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 2533dcf5451SChristoph Hellwig #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 2543dcf5451SChristoph Hellwig #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */ 2553dcf5451SChristoph Hellwig #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 2563dcf5451SChristoph Hellwig 2573dcf5451SChristoph Hellwig #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ 2584db46fc2SAneesh Kumar K.V #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */ 2593dcf5451SChristoph Hellwig 2608fa43a81SDuane Griffin /* Flags that should be inherited by new inodes from their parent. */ 2618fa43a81SDuane Griffin #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 2628fa43a81SDuane Griffin EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ 2638fa43a81SDuane Griffin EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 2648fa43a81SDuane Griffin EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 2658fa43a81SDuane Griffin EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 2668fa43a81SDuane Griffin 2672dc6b0d4SDuane Griffin /* Flags that are appropriate for regular files (all but dir-specific ones). */ 2682dc6b0d4SDuane Griffin #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 2692dc6b0d4SDuane Griffin 2702dc6b0d4SDuane Griffin /* Flags that are appropriate for non-directories/regular files. */ 2712dc6b0d4SDuane Griffin #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 2722dc6b0d4SDuane Griffin 2732dc6b0d4SDuane Griffin /* Mask out flags that are inappropriate for the given type of inode. */ 2742dc6b0d4SDuane Griffin static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 2752dc6b0d4SDuane Griffin { 2762dc6b0d4SDuane Griffin if (S_ISDIR(mode)) 2772dc6b0d4SDuane Griffin return flags; 2782dc6b0d4SDuane Griffin else if (S_ISREG(mode)) 2792dc6b0d4SDuane Griffin return flags & EXT4_REG_FLMASK; 2802dc6b0d4SDuane Griffin else 2812dc6b0d4SDuane Griffin return flags & EXT4_OTHER_FLMASK; 2822dc6b0d4SDuane Griffin } 2832dc6b0d4SDuane Griffin 2843dcf5451SChristoph Hellwig /* 2853dcf5451SChristoph Hellwig * Inode dynamic state flags 2863dcf5451SChristoph Hellwig */ 2873dcf5451SChristoph Hellwig #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */ 2883dcf5451SChristoph Hellwig #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */ 2893dcf5451SChristoph Hellwig #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */ 2903dcf5451SChristoph Hellwig #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ 2917d8f9f7dSTheodore Ts'o #define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */ 2923dcf5451SChristoph Hellwig 2933dcf5451SChristoph Hellwig /* Used to pass group descriptor data when online resize is done */ 2943dcf5451SChristoph Hellwig struct ext4_new_group_input { 2953dcf5451SChristoph Hellwig __u32 group; /* Group number for this data */ 2963dcf5451SChristoph Hellwig __u64 block_bitmap; /* Absolute block number of block bitmap */ 2973dcf5451SChristoph Hellwig __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 2983dcf5451SChristoph Hellwig __u64 inode_table; /* Absolute block number of inode table start */ 2993dcf5451SChristoph Hellwig __u32 blocks_count; /* Total number of blocks in this group */ 3003dcf5451SChristoph Hellwig __u16 reserved_blocks; /* Number of reserved blocks in this group */ 3013dcf5451SChristoph Hellwig __u16 unused; 3023dcf5451SChristoph Hellwig }; 3033dcf5451SChristoph Hellwig 3043dcf5451SChristoph Hellwig /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 3053dcf5451SChristoph Hellwig struct ext4_new_group_data { 3063dcf5451SChristoph Hellwig __u32 group; 3073dcf5451SChristoph Hellwig __u64 block_bitmap; 3083dcf5451SChristoph Hellwig __u64 inode_bitmap; 3093dcf5451SChristoph Hellwig __u64 inode_table; 3103dcf5451SChristoph Hellwig __u32 blocks_count; 3113dcf5451SChristoph Hellwig __u16 reserved_blocks; 3123dcf5451SChristoph Hellwig __u16 unused; 3133dcf5451SChristoph Hellwig __u32 free_blocks_count; 3143dcf5451SChristoph Hellwig }; 3153dcf5451SChristoph Hellwig 3163dcf5451SChristoph Hellwig /* 317c2177057STheodore Ts'o * Flags used by ext4_get_blocks() 3183dcf5451SChristoph Hellwig */ 319c2177057STheodore Ts'o /* Allocate any needed blocks and/or convert an unitialized 320c2177057STheodore Ts'o extent to be an initialized ext4 */ 3212ac3b6e0STheodore Ts'o #define EXT4_GET_BLOCKS_CREATE 0x0001 322c2177057STheodore Ts'o /* Request the creation of an unitialized extent */ 3232ac3b6e0STheodore Ts'o #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 324c2177057STheodore Ts'o #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 325c2177057STheodore Ts'o EXT4_GET_BLOCKS_CREATE) 326c2177057STheodore Ts'o /* Caller is from the delayed allocation writeout path, 3272ac3b6e0STheodore Ts'o so set the magic i_delalloc_reserve_flag after taking the 3282ac3b6e0STheodore Ts'o inode allocation semaphore for */ 32903f5d8bcSJan Kara #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 3302ac3b6e0STheodore Ts'o /* Call ext4_da_update_reserve_space() after successfully 3312ac3b6e0STheodore Ts'o allocating the blocks */ 33203f5d8bcSJan Kara #define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE 0x0008 3332ac3b6e0STheodore Ts'o 3343dcf5451SChristoph Hellwig 3353dcf5451SChristoph Hellwig /* 3363dcf5451SChristoph Hellwig * ioctl commands 3373dcf5451SChristoph Hellwig */ 3383dcf5451SChristoph Hellwig #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 3393dcf5451SChristoph Hellwig #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 3403dcf5451SChristoph Hellwig #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 3413dcf5451SChristoph Hellwig #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 3423dcf5451SChristoph Hellwig #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 3433dcf5451SChristoph Hellwig #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 3443dcf5451SChristoph Hellwig #ifdef CONFIG_JBD2_DEBUG 3453dcf5451SChristoph Hellwig #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 3463dcf5451SChristoph Hellwig #endif 3473dcf5451SChristoph Hellwig #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 3483dcf5451SChristoph Hellwig #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 3498eea80d5STheodore Ts'o #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 3508eea80d5STheodore Ts'o #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 3518eea80d5STheodore Ts'o #define EXT4_IOC_MIGRATE _IO('f', 9) 352ccd2506bSTheodore Ts'o /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 3538eea80d5STheodore Ts'o /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 354ccd2506bSTheodore Ts'o #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 355748de673SAkira Fujita #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 3563dcf5451SChristoph Hellwig 3573dcf5451SChristoph Hellwig /* 3583dcf5451SChristoph Hellwig * ioctl commands in 32 bit emulation 3593dcf5451SChristoph Hellwig */ 3603dcf5451SChristoph Hellwig #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 3613dcf5451SChristoph Hellwig #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 3623dcf5451SChristoph Hellwig #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 3633dcf5451SChristoph Hellwig #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 3643dcf5451SChristoph Hellwig #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 3653dcf5451SChristoph Hellwig #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 3663dcf5451SChristoph Hellwig #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 3673dcf5451SChristoph Hellwig #ifdef CONFIG_JBD2_DEBUG 3683dcf5451SChristoph Hellwig #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 3693dcf5451SChristoph Hellwig #endif 3703dcf5451SChristoph Hellwig #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 3713dcf5451SChristoph Hellwig #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 3723dcf5451SChristoph Hellwig 3733dcf5451SChristoph Hellwig 3743dcf5451SChristoph Hellwig /* 3753dcf5451SChristoph Hellwig * Mount options 3763dcf5451SChristoph Hellwig */ 3773dcf5451SChristoph Hellwig struct ext4_mount_options { 3783dcf5451SChristoph Hellwig unsigned long s_mount_opt; 3793dcf5451SChristoph Hellwig uid_t s_resuid; 3803dcf5451SChristoph Hellwig gid_t s_resgid; 3813dcf5451SChristoph Hellwig unsigned long s_commit_interval; 38230773840STheodore Ts'o u32 s_min_batch_time, s_max_batch_time; 3833dcf5451SChristoph Hellwig #ifdef CONFIG_QUOTA 3843dcf5451SChristoph Hellwig int s_jquota_fmt; 3853dcf5451SChristoph Hellwig char *s_qf_names[MAXQUOTAS]; 3863dcf5451SChristoph Hellwig #endif 3873dcf5451SChristoph Hellwig }; 3883dcf5451SChristoph Hellwig 3893dcf5451SChristoph Hellwig /* 3903dcf5451SChristoph Hellwig * Structure of an inode on the disk 3913dcf5451SChristoph Hellwig */ 3923dcf5451SChristoph Hellwig struct ext4_inode { 3933dcf5451SChristoph Hellwig __le16 i_mode; /* File mode */ 3943dcf5451SChristoph Hellwig __le16 i_uid; /* Low 16 bits of Owner Uid */ 3953dcf5451SChristoph Hellwig __le32 i_size_lo; /* Size in bytes */ 3963dcf5451SChristoph Hellwig __le32 i_atime; /* Access time */ 3973dcf5451SChristoph Hellwig __le32 i_ctime; /* Inode Change time */ 3983dcf5451SChristoph Hellwig __le32 i_mtime; /* Modification time */ 3993dcf5451SChristoph Hellwig __le32 i_dtime; /* Deletion Time */ 4003dcf5451SChristoph Hellwig __le16 i_gid; /* Low 16 bits of Group Id */ 4013dcf5451SChristoph Hellwig __le16 i_links_count; /* Links count */ 4023dcf5451SChristoph Hellwig __le32 i_blocks_lo; /* Blocks count */ 4033dcf5451SChristoph Hellwig __le32 i_flags; /* File flags */ 4043dcf5451SChristoph Hellwig union { 4053dcf5451SChristoph Hellwig struct { 4063dcf5451SChristoph Hellwig __le32 l_i_version; 4073dcf5451SChristoph Hellwig } linux1; 4083dcf5451SChristoph Hellwig struct { 4093dcf5451SChristoph Hellwig __u32 h_i_translator; 4103dcf5451SChristoph Hellwig } hurd1; 4113dcf5451SChristoph Hellwig struct { 4123dcf5451SChristoph Hellwig __u32 m_i_reserved1; 4133dcf5451SChristoph Hellwig } masix1; 4143dcf5451SChristoph Hellwig } osd1; /* OS dependent 1 */ 4153dcf5451SChristoph Hellwig __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 4163dcf5451SChristoph Hellwig __le32 i_generation; /* File version (for NFS) */ 4173dcf5451SChristoph Hellwig __le32 i_file_acl_lo; /* File ACL */ 4183dcf5451SChristoph Hellwig __le32 i_size_high; 4193dcf5451SChristoph Hellwig __le32 i_obso_faddr; /* Obsoleted fragment address */ 4203dcf5451SChristoph Hellwig union { 4213dcf5451SChristoph Hellwig struct { 4223dcf5451SChristoph Hellwig __le16 l_i_blocks_high; /* were l_i_reserved1 */ 4233dcf5451SChristoph Hellwig __le16 l_i_file_acl_high; 4243dcf5451SChristoph Hellwig __le16 l_i_uid_high; /* these 2 fields */ 4253dcf5451SChristoph Hellwig __le16 l_i_gid_high; /* were reserved2[0] */ 4263dcf5451SChristoph Hellwig __u32 l_i_reserved2; 4273dcf5451SChristoph Hellwig } linux2; 4283dcf5451SChristoph Hellwig struct { 4293dcf5451SChristoph Hellwig __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 4303dcf5451SChristoph Hellwig __u16 h_i_mode_high; 4313dcf5451SChristoph Hellwig __u16 h_i_uid_high; 4323dcf5451SChristoph Hellwig __u16 h_i_gid_high; 4333dcf5451SChristoph Hellwig __u32 h_i_author; 4343dcf5451SChristoph Hellwig } hurd2; 4353dcf5451SChristoph Hellwig struct { 4363dcf5451SChristoph Hellwig __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 4373dcf5451SChristoph Hellwig __le16 m_i_file_acl_high; 4383dcf5451SChristoph Hellwig __u32 m_i_reserved2[2]; 4393dcf5451SChristoph Hellwig } masix2; 4403dcf5451SChristoph Hellwig } osd2; /* OS dependent 2 */ 4413dcf5451SChristoph Hellwig __le16 i_extra_isize; 4423dcf5451SChristoph Hellwig __le16 i_pad1; 4433dcf5451SChristoph Hellwig __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 4443dcf5451SChristoph Hellwig __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 4453dcf5451SChristoph Hellwig __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 4463dcf5451SChristoph Hellwig __le32 i_crtime; /* File Creation time */ 4473dcf5451SChristoph Hellwig __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 4483dcf5451SChristoph Hellwig __le32 i_version_hi; /* high 32 bits for 64-bit version */ 4493dcf5451SChristoph Hellwig }; 4503dcf5451SChristoph Hellwig 451748de673SAkira Fujita struct move_extent { 452748de673SAkira Fujita __u32 reserved; /* should be zero */ 453748de673SAkira Fujita __u32 donor_fd; /* donor file descriptor */ 454748de673SAkira Fujita __u64 orig_start; /* logical start offset in block for orig */ 455748de673SAkira Fujita __u64 donor_start; /* logical start offset in block for donor */ 456748de673SAkira Fujita __u64 len; /* block length to be moved */ 457748de673SAkira Fujita __u64 moved_len; /* moved block length */ 458748de673SAkira Fujita }; 459748de673SAkira Fujita #define MAX_DEFRAG_SIZE ((1UL<<31) - 1) 4603dcf5451SChristoph Hellwig 4613dcf5451SChristoph Hellwig #define EXT4_EPOCH_BITS 2 4623dcf5451SChristoph Hellwig #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 4633dcf5451SChristoph Hellwig #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 4643dcf5451SChristoph Hellwig 4653dcf5451SChristoph Hellwig /* 4663dcf5451SChristoph Hellwig * Extended fields will fit into an inode if the filesystem was formatted 4673dcf5451SChristoph Hellwig * with large inodes (-I 256 or larger) and there are not currently any EAs 4683dcf5451SChristoph Hellwig * consuming all of the available space. For new inodes we always reserve 4693dcf5451SChristoph Hellwig * enough space for the kernel's known extended fields, but for inodes 4703dcf5451SChristoph Hellwig * created with an old kernel this might not have been the case. None of 4713dcf5451SChristoph Hellwig * the extended inode fields is critical for correct filesystem operation. 4723dcf5451SChristoph Hellwig * This macro checks if a certain field fits in the inode. Note that 4733dcf5451SChristoph Hellwig * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 4743dcf5451SChristoph Hellwig */ 4753dcf5451SChristoph Hellwig #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 4763dcf5451SChristoph Hellwig ((offsetof(typeof(*ext4_inode), field) + \ 4773dcf5451SChristoph Hellwig sizeof((ext4_inode)->field)) \ 4783dcf5451SChristoph Hellwig <= (EXT4_GOOD_OLD_INODE_SIZE + \ 4793dcf5451SChristoph Hellwig (einode)->i_extra_isize)) \ 4803dcf5451SChristoph Hellwig 4813dcf5451SChristoph Hellwig static inline __le32 ext4_encode_extra_time(struct timespec *time) 4823dcf5451SChristoph Hellwig { 4833dcf5451SChristoph Hellwig return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 4843dcf5451SChristoph Hellwig time->tv_sec >> 32 : 0) | 4853dcf5451SChristoph Hellwig ((time->tv_nsec << 2) & EXT4_NSEC_MASK)); 4863dcf5451SChristoph Hellwig } 4873dcf5451SChristoph Hellwig 4883dcf5451SChristoph Hellwig static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 4893dcf5451SChristoph Hellwig { 4903dcf5451SChristoph Hellwig if (sizeof(time->tv_sec) > 4) 4913dcf5451SChristoph Hellwig time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 4923dcf5451SChristoph Hellwig << 32; 4933dcf5451SChristoph Hellwig time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2; 4943dcf5451SChristoph Hellwig } 4953dcf5451SChristoph Hellwig 4963dcf5451SChristoph Hellwig #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 4973dcf5451SChristoph Hellwig do { \ 4983dcf5451SChristoph Hellwig (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 4993dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 5003dcf5451SChristoph Hellwig (raw_inode)->xtime ## _extra = \ 5013dcf5451SChristoph Hellwig ext4_encode_extra_time(&(inode)->xtime); \ 5023dcf5451SChristoph Hellwig } while (0) 5033dcf5451SChristoph Hellwig 5043dcf5451SChristoph Hellwig #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 5053dcf5451SChristoph Hellwig do { \ 5063dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 5073dcf5451SChristoph Hellwig (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 5083dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 5093dcf5451SChristoph Hellwig (raw_inode)->xtime ## _extra = \ 5103dcf5451SChristoph Hellwig ext4_encode_extra_time(&(einode)->xtime); \ 5113dcf5451SChristoph Hellwig } while (0) 5123dcf5451SChristoph Hellwig 5133dcf5451SChristoph Hellwig #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 5143dcf5451SChristoph Hellwig do { \ 5153dcf5451SChristoph Hellwig (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 5163dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 5173dcf5451SChristoph Hellwig ext4_decode_extra_time(&(inode)->xtime, \ 5183dcf5451SChristoph Hellwig raw_inode->xtime ## _extra); \ 5193dcf5451SChristoph Hellwig } while (0) 5203dcf5451SChristoph Hellwig 5213dcf5451SChristoph Hellwig #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 5223dcf5451SChristoph Hellwig do { \ 5233dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 5243dcf5451SChristoph Hellwig (einode)->xtime.tv_sec = \ 5253dcf5451SChristoph Hellwig (signed)le32_to_cpu((raw_inode)->xtime); \ 5263dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 5273dcf5451SChristoph Hellwig ext4_decode_extra_time(&(einode)->xtime, \ 5283dcf5451SChristoph Hellwig raw_inode->xtime ## _extra); \ 5293dcf5451SChristoph Hellwig } while (0) 5303dcf5451SChristoph Hellwig 5313dcf5451SChristoph Hellwig #define i_disk_version osd1.linux1.l_i_version 5323dcf5451SChristoph Hellwig 5333dcf5451SChristoph Hellwig #if defined(__KERNEL__) || defined(__linux__) 5343dcf5451SChristoph Hellwig #define i_reserved1 osd1.linux1.l_i_reserved1 5353dcf5451SChristoph Hellwig #define i_file_acl_high osd2.linux2.l_i_file_acl_high 5363dcf5451SChristoph Hellwig #define i_blocks_high osd2.linux2.l_i_blocks_high 5373dcf5451SChristoph Hellwig #define i_uid_low i_uid 5383dcf5451SChristoph Hellwig #define i_gid_low i_gid 5393dcf5451SChristoph Hellwig #define i_uid_high osd2.linux2.l_i_uid_high 5403dcf5451SChristoph Hellwig #define i_gid_high osd2.linux2.l_i_gid_high 5413dcf5451SChristoph Hellwig #define i_reserved2 osd2.linux2.l_i_reserved2 5423dcf5451SChristoph Hellwig 5433dcf5451SChristoph Hellwig #elif defined(__GNU__) 5443dcf5451SChristoph Hellwig 5453dcf5451SChristoph Hellwig #define i_translator osd1.hurd1.h_i_translator 5463dcf5451SChristoph Hellwig #define i_uid_high osd2.hurd2.h_i_uid_high 5473dcf5451SChristoph Hellwig #define i_gid_high osd2.hurd2.h_i_gid_high 5483dcf5451SChristoph Hellwig #define i_author osd2.hurd2.h_i_author 5493dcf5451SChristoph Hellwig 5503dcf5451SChristoph Hellwig #elif defined(__masix__) 5513dcf5451SChristoph Hellwig 5523dcf5451SChristoph Hellwig #define i_reserved1 osd1.masix1.m_i_reserved1 5533dcf5451SChristoph Hellwig #define i_file_acl_high osd2.masix2.m_i_file_acl_high 5543dcf5451SChristoph Hellwig #define i_reserved2 osd2.masix2.m_i_reserved2 5553dcf5451SChristoph Hellwig 5563dcf5451SChristoph Hellwig #endif /* defined(__KERNEL__) || defined(__linux__) */ 5573dcf5451SChristoph Hellwig 5583dcf5451SChristoph Hellwig /* 559d444c3c3STheodore Ts'o * storage for cached extent 560d444c3c3STheodore Ts'o */ 561d444c3c3STheodore Ts'o struct ext4_ext_cache { 562d444c3c3STheodore Ts'o ext4_fsblk_t ec_start; 563d444c3c3STheodore Ts'o ext4_lblk_t ec_block; 564d444c3c3STheodore Ts'o __u32 ec_len; /* must be 32bit to return holes */ 565d444c3c3STheodore Ts'o __u32 ec_type; 566d444c3c3STheodore Ts'o }; 567d444c3c3STheodore Ts'o 568d444c3c3STheodore Ts'o /* 569d444c3c3STheodore Ts'o * fourth extended file system inode data in memory 570d444c3c3STheodore Ts'o */ 571d444c3c3STheodore Ts'o struct ext4_inode_info { 572d444c3c3STheodore Ts'o __le32 i_data[15]; /* unconverted */ 573d444c3c3STheodore Ts'o __u32 i_flags; 574d444c3c3STheodore Ts'o ext4_fsblk_t i_file_acl; 575d444c3c3STheodore Ts'o __u32 i_dtime; 576d444c3c3STheodore Ts'o 577d444c3c3STheodore Ts'o /* 578d444c3c3STheodore Ts'o * i_block_group is the number of the block group which contains 579d444c3c3STheodore Ts'o * this file's inode. Constant across the lifetime of the inode, 580d444c3c3STheodore Ts'o * it is ued for making block allocation decisions - we try to 581d444c3c3STheodore Ts'o * place a file's data blocks near its inode block, and new inodes 582d444c3c3STheodore Ts'o * near to their parent directory's inode. 583d444c3c3STheodore Ts'o */ 584d444c3c3STheodore Ts'o ext4_group_t i_block_group; 585d444c3c3STheodore Ts'o __u32 i_state; /* Dynamic state flags for ext4 */ 586d444c3c3STheodore Ts'o 587d444c3c3STheodore Ts'o ext4_lblk_t i_dir_start_lookup; 588d444c3c3STheodore Ts'o #ifdef CONFIG_EXT4_FS_XATTR 589d444c3c3STheodore Ts'o /* 590d444c3c3STheodore Ts'o * Extended attributes can be read independently of the main file 591d444c3c3STheodore Ts'o * data. Taking i_mutex even when reading would cause contention 592d444c3c3STheodore Ts'o * between readers of EAs and writers of regular file data, so 593d444c3c3STheodore Ts'o * instead we synchronize on xattr_sem when reading or changing 594d444c3c3STheodore Ts'o * EAs. 595d444c3c3STheodore Ts'o */ 596d444c3c3STheodore Ts'o struct rw_semaphore xattr_sem; 597d444c3c3STheodore Ts'o #endif 598d444c3c3STheodore Ts'o 599d444c3c3STheodore Ts'o struct list_head i_orphan; /* unlinked but open inodes */ 600d444c3c3STheodore Ts'o 601d444c3c3STheodore Ts'o /* 602d444c3c3STheodore Ts'o * i_disksize keeps track of what the inode size is ON DISK, not 603d444c3c3STheodore Ts'o * in memory. During truncate, i_size is set to the new size by 604d444c3c3STheodore Ts'o * the VFS prior to calling ext4_truncate(), but the filesystem won't 605d444c3c3STheodore Ts'o * set i_disksize to 0 until the truncate is actually under way. 606d444c3c3STheodore Ts'o * 607d444c3c3STheodore Ts'o * The intent is that i_disksize always represents the blocks which 608d444c3c3STheodore Ts'o * are used by this file. This allows recovery to restart truncate 609d444c3c3STheodore Ts'o * on orphans if we crash during truncate. We actually write i_disksize 610d444c3c3STheodore Ts'o * into the on-disk inode when writing inodes out, instead of i_size. 611d444c3c3STheodore Ts'o * 612d444c3c3STheodore Ts'o * The only time when i_disksize and i_size may be different is when 613d444c3c3STheodore Ts'o * a truncate is in progress. The only things which change i_disksize 614d444c3c3STheodore Ts'o * are ext4_get_block (growth) and ext4_truncate (shrinkth). 615d444c3c3STheodore Ts'o */ 616d444c3c3STheodore Ts'o loff_t i_disksize; 617d444c3c3STheodore Ts'o 618d444c3c3STheodore Ts'o /* 619d444c3c3STheodore Ts'o * i_data_sem is for serialising ext4_truncate() against 620d444c3c3STheodore Ts'o * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 621d444c3c3STheodore Ts'o * data tree are chopped off during truncate. We can't do that in 622d444c3c3STheodore Ts'o * ext4 because whenever we perform intermediate commits during 623d444c3c3STheodore Ts'o * truncate, the inode and all the metadata blocks *must* be in a 624d444c3c3STheodore Ts'o * consistent state which allows truncation of the orphans to restart 625d444c3c3STheodore Ts'o * during recovery. Hence we must fix the get_block-vs-truncate race 626d444c3c3STheodore Ts'o * by other means, so we have i_data_sem. 627d444c3c3STheodore Ts'o */ 628d444c3c3STheodore Ts'o struct rw_semaphore i_data_sem; 629d444c3c3STheodore Ts'o struct inode vfs_inode; 630d444c3c3STheodore Ts'o struct jbd2_inode jinode; 631d444c3c3STheodore Ts'o 632d444c3c3STheodore Ts'o struct ext4_ext_cache i_cached_extent; 633d444c3c3STheodore Ts'o /* 634d444c3c3STheodore Ts'o * File creation time. Its function is same as that of 635d444c3c3STheodore Ts'o * struct timespec i_{a,c,m}time in the generic inode. 636d444c3c3STheodore Ts'o */ 637d444c3c3STheodore Ts'o struct timespec i_crtime; 638d444c3c3STheodore Ts'o 639d444c3c3STheodore Ts'o /* mballoc */ 640d444c3c3STheodore Ts'o struct list_head i_prealloc_list; 641d444c3c3STheodore Ts'o spinlock_t i_prealloc_lock; 642d444c3c3STheodore Ts'o 643d444c3c3STheodore Ts'o /* ialloc */ 644d444c3c3STheodore Ts'o ext4_group_t i_last_alloc_group; 645d444c3c3STheodore Ts'o 646d444c3c3STheodore Ts'o /* allocation reservation info for delalloc */ 647d444c3c3STheodore Ts'o unsigned int i_reserved_data_blocks; 648d444c3c3STheodore Ts'o unsigned int i_reserved_meta_blocks; 649d444c3c3STheodore Ts'o unsigned int i_allocated_meta_blocks; 650d444c3c3STheodore Ts'o unsigned short i_delalloc_reserved_flag; 651d444c3c3STheodore Ts'o 652d444c3c3STheodore Ts'o /* on-disk additional length */ 653d444c3c3STheodore Ts'o __u16 i_extra_isize; 654d444c3c3STheodore Ts'o 655d444c3c3STheodore Ts'o spinlock_t i_block_reservation_lock; 656d444c3c3STheodore Ts'o }; 657d444c3c3STheodore Ts'o 658d444c3c3STheodore Ts'o /* 6593dcf5451SChristoph Hellwig * File system states 6603dcf5451SChristoph Hellwig */ 6613dcf5451SChristoph Hellwig #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 6623dcf5451SChristoph Hellwig #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 6633dcf5451SChristoph Hellwig #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 6643dcf5451SChristoph Hellwig 6653dcf5451SChristoph Hellwig /* 6663dcf5451SChristoph Hellwig * Misc. filesystem flags 6673dcf5451SChristoph Hellwig */ 6683dcf5451SChristoph Hellwig #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 6693dcf5451SChristoph Hellwig #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 6703dcf5451SChristoph Hellwig #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 6713dcf5451SChristoph Hellwig 6723dcf5451SChristoph Hellwig /* 6733dcf5451SChristoph Hellwig * Mount flags 6743dcf5451SChristoph Hellwig */ 6753dcf5451SChristoph Hellwig #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 6763dcf5451SChristoph Hellwig #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 6773dcf5451SChristoph Hellwig #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 6783dcf5451SChristoph Hellwig #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 6793dcf5451SChristoph Hellwig #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 6803dcf5451SChristoph Hellwig #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 6813dcf5451SChristoph Hellwig #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 6823dcf5451SChristoph Hellwig #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 6833dcf5451SChristoph Hellwig #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 6843dcf5451SChristoph Hellwig #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 6853dcf5451SChristoph Hellwig #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 6863dcf5451SChristoph Hellwig #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 6873dcf5451SChristoph Hellwig #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 6883dcf5451SChristoph Hellwig #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 6893dcf5451SChristoph Hellwig #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 6903dcf5451SChristoph Hellwig #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 691afd4672dSTheodore Ts'o #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 6923dcf5451SChristoph Hellwig #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 6933dcf5451SChristoph Hellwig #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ 6943dcf5451SChristoph Hellwig #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 6953dcf5451SChristoph Hellwig #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 6963dcf5451SChristoph Hellwig #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 6973dcf5451SChristoph Hellwig #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 6983dcf5451SChristoph Hellwig #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 6993dcf5451SChristoph Hellwig #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 70064769240SAlex Tomas #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 7015bf5683aSHidehiro Kawai #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 7026fd058f7STheodore Ts'o #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 7035bf5683aSHidehiro Kawai 7043dcf5451SChristoph Hellwig #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt 7053dcf5451SChristoph Hellwig #define set_opt(o, opt) o |= EXT4_MOUNT_##opt 7063dcf5451SChristoph Hellwig #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 7073dcf5451SChristoph Hellwig EXT4_MOUNT_##opt) 7083dcf5451SChristoph Hellwig 7093dcf5451SChristoph Hellwig #define ext4_set_bit ext2_set_bit 7103dcf5451SChristoph Hellwig #define ext4_set_bit_atomic ext2_set_bit_atomic 7113dcf5451SChristoph Hellwig #define ext4_clear_bit ext2_clear_bit 7123dcf5451SChristoph Hellwig #define ext4_clear_bit_atomic ext2_clear_bit_atomic 7133dcf5451SChristoph Hellwig #define ext4_test_bit ext2_test_bit 7143dcf5451SChristoph Hellwig #define ext4_find_first_zero_bit ext2_find_first_zero_bit 7153dcf5451SChristoph Hellwig #define ext4_find_next_zero_bit ext2_find_next_zero_bit 7163dcf5451SChristoph Hellwig #define ext4_find_next_bit ext2_find_next_bit 7173dcf5451SChristoph Hellwig 7183dcf5451SChristoph Hellwig /* 7193dcf5451SChristoph Hellwig * Maximal mount counts between two filesystem checks 7203dcf5451SChristoph Hellwig */ 7213dcf5451SChristoph Hellwig #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 7223dcf5451SChristoph Hellwig #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 7233dcf5451SChristoph Hellwig 7243dcf5451SChristoph Hellwig /* 7253dcf5451SChristoph Hellwig * Behaviour when detecting errors 7263dcf5451SChristoph Hellwig */ 7273dcf5451SChristoph Hellwig #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 7283dcf5451SChristoph Hellwig #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 7293dcf5451SChristoph Hellwig #define EXT4_ERRORS_PANIC 3 /* Panic */ 7303dcf5451SChristoph Hellwig #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 7313dcf5451SChristoph Hellwig 7323dcf5451SChristoph Hellwig /* 7333dcf5451SChristoph Hellwig * Structure of the super block 7343dcf5451SChristoph Hellwig */ 7353dcf5451SChristoph Hellwig struct ext4_super_block { 7363dcf5451SChristoph Hellwig /*00*/ __le32 s_inodes_count; /* Inodes count */ 7373dcf5451SChristoph Hellwig __le32 s_blocks_count_lo; /* Blocks count */ 7383dcf5451SChristoph Hellwig __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 7393dcf5451SChristoph Hellwig __le32 s_free_blocks_count_lo; /* Free blocks count */ 7403dcf5451SChristoph Hellwig /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 7413dcf5451SChristoph Hellwig __le32 s_first_data_block; /* First Data Block */ 7423dcf5451SChristoph Hellwig __le32 s_log_block_size; /* Block size */ 7433dcf5451SChristoph Hellwig __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ 7443dcf5451SChristoph Hellwig /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 7453dcf5451SChristoph Hellwig __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ 7463dcf5451SChristoph Hellwig __le32 s_inodes_per_group; /* # Inodes per group */ 7473dcf5451SChristoph Hellwig __le32 s_mtime; /* Mount time */ 7483dcf5451SChristoph Hellwig /*30*/ __le32 s_wtime; /* Write time */ 7493dcf5451SChristoph Hellwig __le16 s_mnt_count; /* Mount count */ 7503dcf5451SChristoph Hellwig __le16 s_max_mnt_count; /* Maximal mount count */ 7513dcf5451SChristoph Hellwig __le16 s_magic; /* Magic signature */ 7523dcf5451SChristoph Hellwig __le16 s_state; /* File system state */ 7533dcf5451SChristoph Hellwig __le16 s_errors; /* Behaviour when detecting errors */ 7543dcf5451SChristoph Hellwig __le16 s_minor_rev_level; /* minor revision level */ 7553dcf5451SChristoph Hellwig /*40*/ __le32 s_lastcheck; /* time of last check */ 7563dcf5451SChristoph Hellwig __le32 s_checkinterval; /* max. time between checks */ 7573dcf5451SChristoph Hellwig __le32 s_creator_os; /* OS */ 7583dcf5451SChristoph Hellwig __le32 s_rev_level; /* Revision level */ 7593dcf5451SChristoph Hellwig /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 7603dcf5451SChristoph Hellwig __le16 s_def_resgid; /* Default gid for reserved blocks */ 7613dcf5451SChristoph Hellwig /* 7623dcf5451SChristoph Hellwig * These fields are for EXT4_DYNAMIC_REV superblocks only. 7633dcf5451SChristoph Hellwig * 7643dcf5451SChristoph Hellwig * Note: the difference between the compatible feature set and 7653dcf5451SChristoph Hellwig * the incompatible feature set is that if there is a bit set 7663dcf5451SChristoph Hellwig * in the incompatible feature set that the kernel doesn't 7673dcf5451SChristoph Hellwig * know about, it should refuse to mount the filesystem. 7683dcf5451SChristoph Hellwig * 7693dcf5451SChristoph Hellwig * e2fsck's requirements are more strict; if it doesn't know 7703dcf5451SChristoph Hellwig * about a feature in either the compatible or incompatible 7713dcf5451SChristoph Hellwig * feature set, it must abort and not try to meddle with 7723dcf5451SChristoph Hellwig * things it doesn't understand... 7733dcf5451SChristoph Hellwig */ 7743dcf5451SChristoph Hellwig __le32 s_first_ino; /* First non-reserved inode */ 7753dcf5451SChristoph Hellwig __le16 s_inode_size; /* size of inode structure */ 7763dcf5451SChristoph Hellwig __le16 s_block_group_nr; /* block group # of this superblock */ 7773dcf5451SChristoph Hellwig __le32 s_feature_compat; /* compatible feature set */ 7783dcf5451SChristoph Hellwig /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 7793dcf5451SChristoph Hellwig __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 7803dcf5451SChristoph Hellwig /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 7813dcf5451SChristoph Hellwig /*78*/ char s_volume_name[16]; /* volume name */ 7823dcf5451SChristoph Hellwig /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 7833dcf5451SChristoph Hellwig /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 7843dcf5451SChristoph Hellwig /* 7853dcf5451SChristoph Hellwig * Performance hints. Directory preallocation should only 7863dcf5451SChristoph Hellwig * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 7873dcf5451SChristoph Hellwig */ 7883dcf5451SChristoph Hellwig __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 7893dcf5451SChristoph Hellwig __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 7903dcf5451SChristoph Hellwig __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 7913dcf5451SChristoph Hellwig /* 7923dcf5451SChristoph Hellwig * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 7933dcf5451SChristoph Hellwig */ 7943dcf5451SChristoph Hellwig /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 7953dcf5451SChristoph Hellwig /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 7963dcf5451SChristoph Hellwig __le32 s_journal_dev; /* device number of journal file */ 7973dcf5451SChristoph Hellwig __le32 s_last_orphan; /* start of list of inodes to delete */ 7983dcf5451SChristoph Hellwig __le32 s_hash_seed[4]; /* HTREE hash seed */ 7993dcf5451SChristoph Hellwig __u8 s_def_hash_version; /* Default hash version to use */ 8003dcf5451SChristoph Hellwig __u8 s_reserved_char_pad; 8013dcf5451SChristoph Hellwig __le16 s_desc_size; /* size of group descriptor */ 8023dcf5451SChristoph Hellwig /*100*/ __le32 s_default_mount_opts; 8033dcf5451SChristoph Hellwig __le32 s_first_meta_bg; /* First metablock block group */ 8043dcf5451SChristoph Hellwig __le32 s_mkfs_time; /* When the filesystem was created */ 8053dcf5451SChristoph Hellwig __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 8063dcf5451SChristoph Hellwig /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 8073dcf5451SChristoph Hellwig /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 8083dcf5451SChristoph Hellwig __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 8093dcf5451SChristoph Hellwig __le32 s_free_blocks_count_hi; /* Free blocks count */ 8103dcf5451SChristoph Hellwig __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 8113dcf5451SChristoph Hellwig __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 8123dcf5451SChristoph Hellwig __le32 s_flags; /* Miscellaneous flags */ 8133dcf5451SChristoph Hellwig __le16 s_raid_stride; /* RAID stride */ 8143dcf5451SChristoph Hellwig __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ 8153dcf5451SChristoph Hellwig __le64 s_mmp_block; /* Block for multi-mount protection */ 8163dcf5451SChristoph Hellwig __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 817772cb7c8SJose R. Santos __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 818772cb7c8SJose R. Santos __u8 s_reserved_char_pad2; 819772cb7c8SJose R. Santos __le16 s_reserved_pad; 820afc32f7eSTheodore Ts'o __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 821afc32f7eSTheodore Ts'o __u32 s_reserved[160]; /* Padding to the end of the block */ 8223dcf5451SChristoph Hellwig }; 8233dcf5451SChristoph Hellwig 8243dcf5451SChristoph Hellwig #ifdef __KERNEL__ 825bc0b0d6dSTheodore Ts'o 826bc0b0d6dSTheodore Ts'o /* 8274ab2f15bSTheodore Ts'o * run-time mount flags 828bc0b0d6dSTheodore Ts'o */ 829bc0b0d6dSTheodore Ts'o #define EXT4_MF_MNTDIR_SAMPLED 0x0001 8304ab2f15bSTheodore Ts'o #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 831bc0b0d6dSTheodore Ts'o 832ca0faba0STheodore Ts'o /* 833ca0faba0STheodore Ts'o * fourth extended-fs super-block data in memory 834ca0faba0STheodore Ts'o */ 835ca0faba0STheodore Ts'o struct ext4_sb_info { 836ca0faba0STheodore Ts'o unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 837ca0faba0STheodore Ts'o unsigned long s_inodes_per_block;/* Number of inodes per block */ 838ca0faba0STheodore Ts'o unsigned long s_blocks_per_group;/* Number of blocks in a group */ 839ca0faba0STheodore Ts'o unsigned long s_inodes_per_group;/* Number of inodes in a group */ 840ca0faba0STheodore Ts'o unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 841ca0faba0STheodore Ts'o unsigned long s_gdb_count; /* Number of group descriptor blocks */ 842ca0faba0STheodore Ts'o unsigned long s_desc_per_block; /* Number of group descriptors per block */ 843ca0faba0STheodore Ts'o ext4_group_t s_groups_count; /* Number of groups in the fs */ 844ca0faba0STheodore Ts'o unsigned long s_overhead_last; /* Last calculated overhead */ 845ca0faba0STheodore Ts'o unsigned long s_blocks_last; /* Last seen block count */ 846ca0faba0STheodore Ts'o loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 847ca0faba0STheodore Ts'o struct buffer_head * s_sbh; /* Buffer containing the super block */ 848ca0faba0STheodore Ts'o struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 849ca0faba0STheodore Ts'o struct buffer_head **s_group_desc; 8507f4520ccSTheodore Ts'o unsigned int s_mount_opt; 851bc0b0d6dSTheodore Ts'o unsigned int s_mount_flags; 852ca0faba0STheodore Ts'o ext4_fsblk_t s_sb_block; 853ca0faba0STheodore Ts'o uid_t s_resuid; 854ca0faba0STheodore Ts'o gid_t s_resgid; 855ca0faba0STheodore Ts'o unsigned short s_mount_state; 856ca0faba0STheodore Ts'o unsigned short s_pad; 857ca0faba0STheodore Ts'o int s_addr_per_block_bits; 858ca0faba0STheodore Ts'o int s_desc_per_block_bits; 859ca0faba0STheodore Ts'o int s_inode_size; 860ca0faba0STheodore Ts'o int s_first_ino; 861ca0faba0STheodore Ts'o unsigned int s_inode_readahead_blks; 86211013911SAndreas Dilger unsigned int s_inode_goal; 863ca0faba0STheodore Ts'o spinlock_t s_next_gen_lock; 864ca0faba0STheodore Ts'o u32 s_next_generation; 865ca0faba0STheodore Ts'o u32 s_hash_seed[4]; 866ca0faba0STheodore Ts'o int s_def_hash_version; 867ca0faba0STheodore Ts'o int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 868ca0faba0STheodore Ts'o struct percpu_counter s_freeblocks_counter; 869ca0faba0STheodore Ts'o struct percpu_counter s_freeinodes_counter; 870ca0faba0STheodore Ts'o struct percpu_counter s_dirs_counter; 871ca0faba0STheodore Ts'o struct percpu_counter s_dirtyblocks_counter; 872ca0faba0STheodore Ts'o struct blockgroup_lock *s_blockgroup_lock; 873ca0faba0STheodore Ts'o struct proc_dir_entry *s_proc; 874ca0faba0STheodore Ts'o struct kobject s_kobj; 875ca0faba0STheodore Ts'o struct completion s_kobj_unregister; 876ca0faba0STheodore Ts'o 877ca0faba0STheodore Ts'o /* Journaling */ 878ca0faba0STheodore Ts'o struct inode *s_journal_inode; 879ca0faba0STheodore Ts'o struct journal_s *s_journal; 880ca0faba0STheodore Ts'o struct list_head s_orphan; 881ca0faba0STheodore Ts'o struct mutex s_orphan_lock; 882ca0faba0STheodore Ts'o struct mutex s_resize_lock; 883ca0faba0STheodore Ts'o unsigned long s_commit_interval; 884ca0faba0STheodore Ts'o u32 s_max_batch_time; 885ca0faba0STheodore Ts'o u32 s_min_batch_time; 886ca0faba0STheodore Ts'o struct block_device *journal_bdev; 887ca0faba0STheodore Ts'o #ifdef CONFIG_JBD2_DEBUG 888ca0faba0STheodore Ts'o struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */ 889ca0faba0STheodore Ts'o wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */ 890ca0faba0STheodore Ts'o #endif 891ca0faba0STheodore Ts'o #ifdef CONFIG_QUOTA 892ca0faba0STheodore Ts'o char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 893ca0faba0STheodore Ts'o int s_jquota_fmt; /* Format of quota to use */ 894ca0faba0STheodore Ts'o #endif 895ca0faba0STheodore Ts'o unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 8966fd058f7STheodore Ts'o struct rb_root system_blks; 897ca0faba0STheodore Ts'o 898ca0faba0STheodore Ts'o #ifdef EXTENTS_STATS 899ca0faba0STheodore Ts'o /* ext4 extents stats */ 900ca0faba0STheodore Ts'o unsigned long s_ext_min; 901ca0faba0STheodore Ts'o unsigned long s_ext_max; 902ca0faba0STheodore Ts'o unsigned long s_depth_max; 903ca0faba0STheodore Ts'o spinlock_t s_ext_stats_lock; 904ca0faba0STheodore Ts'o unsigned long s_ext_blocks; 905ca0faba0STheodore Ts'o unsigned long s_ext_extents; 906ca0faba0STheodore Ts'o #endif 907ca0faba0STheodore Ts'o 908ca0faba0STheodore Ts'o /* for buddy allocator */ 909ca0faba0STheodore Ts'o struct ext4_group_info ***s_group_info; 910ca0faba0STheodore Ts'o struct inode *s_buddy_cache; 911ca0faba0STheodore Ts'o long s_blocks_reserved; 912ca0faba0STheodore Ts'o spinlock_t s_reserve_lock; 913ca0faba0STheodore Ts'o spinlock_t s_md_lock; 914ca0faba0STheodore Ts'o tid_t s_last_transaction; 915ca0faba0STheodore Ts'o unsigned short *s_mb_offsets; 916ca0faba0STheodore Ts'o unsigned int *s_mb_maxs; 917ca0faba0STheodore Ts'o 918ca0faba0STheodore Ts'o /* tunables */ 919ca0faba0STheodore Ts'o unsigned long s_stripe; 920ca0faba0STheodore Ts'o unsigned int s_mb_stream_request; 921ca0faba0STheodore Ts'o unsigned int s_mb_max_to_scan; 922ca0faba0STheodore Ts'o unsigned int s_mb_min_to_scan; 923ca0faba0STheodore Ts'o unsigned int s_mb_stats; 924ca0faba0STheodore Ts'o unsigned int s_mb_order2_reqs; 925ca0faba0STheodore Ts'o unsigned int s_mb_group_prealloc; 926ca0faba0STheodore Ts'o /* where last allocation was done - for stream allocation */ 927ca0faba0STheodore Ts'o unsigned long s_mb_last_group; 928ca0faba0STheodore Ts'o unsigned long s_mb_last_start; 929ca0faba0STheodore Ts'o 930ca0faba0STheodore Ts'o /* history to debug policy */ 931ca0faba0STheodore Ts'o struct ext4_mb_history *s_mb_history; 932ca0faba0STheodore Ts'o int s_mb_history_cur; 933ca0faba0STheodore Ts'o int s_mb_history_max; 934ca0faba0STheodore Ts'o int s_mb_history_num; 935ca0faba0STheodore Ts'o spinlock_t s_mb_history_lock; 936ca0faba0STheodore Ts'o int s_mb_history_filter; 937ca0faba0STheodore Ts'o 938ca0faba0STheodore Ts'o /* stats for buddy allocator */ 939ca0faba0STheodore Ts'o spinlock_t s_mb_pa_lock; 940ca0faba0STheodore Ts'o atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 941ca0faba0STheodore Ts'o atomic_t s_bal_success; /* we found long enough chunks */ 942ca0faba0STheodore Ts'o atomic_t s_bal_allocated; /* in blocks */ 943ca0faba0STheodore Ts'o atomic_t s_bal_ex_scanned; /* total extents scanned */ 944ca0faba0STheodore Ts'o atomic_t s_bal_goals; /* goal hits */ 945ca0faba0STheodore Ts'o atomic_t s_bal_breaks; /* too long searches */ 946ca0faba0STheodore Ts'o atomic_t s_bal_2orders; /* 2^order hits */ 947ca0faba0STheodore Ts'o spinlock_t s_bal_lock; 948ca0faba0STheodore Ts'o unsigned long s_mb_buddies_generated; 949ca0faba0STheodore Ts'o unsigned long long s_mb_generation_time; 950ca0faba0STheodore Ts'o atomic_t s_mb_lost_chunks; 951ca0faba0STheodore Ts'o atomic_t s_mb_preallocated; 952ca0faba0STheodore Ts'o atomic_t s_mb_discarded; 953ca0faba0STheodore Ts'o 954ca0faba0STheodore Ts'o /* locality groups */ 955ca0faba0STheodore Ts'o struct ext4_locality_group *s_locality_groups; 956ca0faba0STheodore Ts'o 957ca0faba0STheodore Ts'o /* for write statistics */ 958ca0faba0STheodore Ts'o unsigned long s_sectors_written_start; 959ca0faba0STheodore Ts'o u64 s_kbytes_written; 960ca0faba0STheodore Ts'o 961ca0faba0STheodore Ts'o unsigned int s_log_groups_per_flex; 962ca0faba0STheodore Ts'o struct flex_groups *s_flex_groups; 963ca0faba0STheodore Ts'o }; 964ca0faba0STheodore Ts'o 9653dcf5451SChristoph Hellwig static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 9663dcf5451SChristoph Hellwig { 9673dcf5451SChristoph Hellwig return sb->s_fs_info; 9683dcf5451SChristoph Hellwig } 9693dcf5451SChristoph Hellwig static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 9703dcf5451SChristoph Hellwig { 9713dcf5451SChristoph Hellwig return container_of(inode, struct ext4_inode_info, vfs_inode); 9723dcf5451SChristoph Hellwig } 9733dcf5451SChristoph Hellwig 9743dcf5451SChristoph Hellwig static inline struct timespec ext4_current_time(struct inode *inode) 9753dcf5451SChristoph Hellwig { 9763dcf5451SChristoph Hellwig return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 9773dcf5451SChristoph Hellwig current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 9783dcf5451SChristoph Hellwig } 9793dcf5451SChristoph Hellwig 9803dcf5451SChristoph Hellwig static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 9813dcf5451SChristoph Hellwig { 9823dcf5451SChristoph Hellwig return ino == EXT4_ROOT_INO || 9833dcf5451SChristoph Hellwig ino == EXT4_JOURNAL_INO || 9843dcf5451SChristoph Hellwig ino == EXT4_RESIZE_INO || 9853dcf5451SChristoph Hellwig (ino >= EXT4_FIRST_INO(sb) && 9863dcf5451SChristoph Hellwig ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 9873dcf5451SChristoph Hellwig } 9883dcf5451SChristoph Hellwig #else 9893dcf5451SChristoph Hellwig /* Assume that user mode programs are passing in an ext4fs superblock, not 9903dcf5451SChristoph Hellwig * a kernel struct super_block. This will allow us to call the feature-test 9913dcf5451SChristoph Hellwig * macros from user land. */ 9923dcf5451SChristoph Hellwig #define EXT4_SB(sb) (sb) 9933dcf5451SChristoph Hellwig #endif 9943dcf5451SChristoph Hellwig 9953dcf5451SChristoph Hellwig #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 9963dcf5451SChristoph Hellwig 9973dcf5451SChristoph Hellwig /* 9983dcf5451SChristoph Hellwig * Codes for operating systems 9993dcf5451SChristoph Hellwig */ 10003dcf5451SChristoph Hellwig #define EXT4_OS_LINUX 0 10013dcf5451SChristoph Hellwig #define EXT4_OS_HURD 1 10023dcf5451SChristoph Hellwig #define EXT4_OS_MASIX 2 10033dcf5451SChristoph Hellwig #define EXT4_OS_FREEBSD 3 10043dcf5451SChristoph Hellwig #define EXT4_OS_LITES 4 10053dcf5451SChristoph Hellwig 10063dcf5451SChristoph Hellwig /* 10073dcf5451SChristoph Hellwig * Revision levels 10083dcf5451SChristoph Hellwig */ 10093dcf5451SChristoph Hellwig #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 10103dcf5451SChristoph Hellwig #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 10113dcf5451SChristoph Hellwig 10123dcf5451SChristoph Hellwig #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 10133dcf5451SChristoph Hellwig #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 10143dcf5451SChristoph Hellwig 10153dcf5451SChristoph Hellwig #define EXT4_GOOD_OLD_INODE_SIZE 128 10163dcf5451SChristoph Hellwig 10173dcf5451SChristoph Hellwig /* 10183dcf5451SChristoph Hellwig * Feature set definitions 10193dcf5451SChristoph Hellwig */ 10203dcf5451SChristoph Hellwig 10213dcf5451SChristoph Hellwig #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 10223a06d778SAneesh Kumar K.V ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 10233dcf5451SChristoph Hellwig #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 10243a06d778SAneesh Kumar K.V ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 10253dcf5451SChristoph Hellwig #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 10263a06d778SAneesh Kumar K.V ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 10273dcf5451SChristoph Hellwig #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 10283dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 10293dcf5451SChristoph Hellwig #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 10303dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 10313dcf5451SChristoph Hellwig #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 10323dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 10333dcf5451SChristoph Hellwig #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 10343dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 10353dcf5451SChristoph Hellwig #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 10363dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 10373dcf5451SChristoph Hellwig #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 10383dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 10393dcf5451SChristoph Hellwig 10403dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 10413dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 10423dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 10433dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 10443dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 10453dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 10463dcf5451SChristoph Hellwig 10473dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 10483dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 10493dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 10503dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 10513dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 10523dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 10533dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 10543dcf5451SChristoph Hellwig 10553dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 10563dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 10573dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 10583dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 10593dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 10603dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 10613dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 10623dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 10633dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 10643dcf5451SChristoph Hellwig 10653dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 10663dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 10673dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_RECOVER| \ 10683dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_META_BG| \ 10693dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_EXTENTS| \ 10703dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_64BIT| \ 10713dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_FLEX_BG) 10723dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 10733dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 10743dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 10753dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 10763dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 10773dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 10783dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 10793dcf5451SChristoph Hellwig 10803dcf5451SChristoph Hellwig /* 10813dcf5451SChristoph Hellwig * Default values for user and/or group using reserved blocks 10823dcf5451SChristoph Hellwig */ 10833dcf5451SChristoph Hellwig #define EXT4_DEF_RESUID 0 10843dcf5451SChristoph Hellwig #define EXT4_DEF_RESGID 0 10853dcf5451SChristoph Hellwig 1086240799cdSTheodore Ts'o #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1087240799cdSTheodore Ts'o 10883dcf5451SChristoph Hellwig /* 10893dcf5451SChristoph Hellwig * Default mount options 10903dcf5451SChristoph Hellwig */ 10913dcf5451SChristoph Hellwig #define EXT4_DEFM_DEBUG 0x0001 10923dcf5451SChristoph Hellwig #define EXT4_DEFM_BSDGROUPS 0x0002 10933dcf5451SChristoph Hellwig #define EXT4_DEFM_XATTR_USER 0x0004 10943dcf5451SChristoph Hellwig #define EXT4_DEFM_ACL 0x0008 10953dcf5451SChristoph Hellwig #define EXT4_DEFM_UID16 0x0010 10963dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE 0x0060 10973dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE_DATA 0x0020 10983dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE_ORDERED 0x0040 10993dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE_WBACK 0x0060 11003dcf5451SChristoph Hellwig 11013dcf5451SChristoph Hellwig /* 110230773840STheodore Ts'o * Default journal batch times 110330773840STheodore Ts'o */ 110430773840STheodore Ts'o #define EXT4_DEF_MIN_BATCH_TIME 0 110530773840STheodore Ts'o #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 110630773840STheodore Ts'o 110730773840STheodore Ts'o /* 1108a4912123STheodore Ts'o * Minimum number of groups in a flexgroup before we separate out 1109a4912123STheodore Ts'o * directories into the first block group of a flexgroup 1110a4912123STheodore Ts'o */ 1111a4912123STheodore Ts'o #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1112a4912123STheodore Ts'o 1113a4912123STheodore Ts'o /* 11143dcf5451SChristoph Hellwig * Structure of a directory entry 11153dcf5451SChristoph Hellwig */ 11163dcf5451SChristoph Hellwig #define EXT4_NAME_LEN 255 11173dcf5451SChristoph Hellwig 11183dcf5451SChristoph Hellwig struct ext4_dir_entry { 11193dcf5451SChristoph Hellwig __le32 inode; /* Inode number */ 11203dcf5451SChristoph Hellwig __le16 rec_len; /* Directory entry length */ 11213dcf5451SChristoph Hellwig __le16 name_len; /* Name length */ 11223dcf5451SChristoph Hellwig char name[EXT4_NAME_LEN]; /* File name */ 11233dcf5451SChristoph Hellwig }; 11243dcf5451SChristoph Hellwig 11253dcf5451SChristoph Hellwig /* 11263dcf5451SChristoph Hellwig * The new version of the directory entry. Since EXT4 structures are 11273dcf5451SChristoph Hellwig * stored in intel byte order, and the name_len field could never be 11283dcf5451SChristoph Hellwig * bigger than 255 chars, it's safe to reclaim the extra byte for the 11293dcf5451SChristoph Hellwig * file_type field. 11303dcf5451SChristoph Hellwig */ 11313dcf5451SChristoph Hellwig struct ext4_dir_entry_2 { 11323dcf5451SChristoph Hellwig __le32 inode; /* Inode number */ 11333dcf5451SChristoph Hellwig __le16 rec_len; /* Directory entry length */ 11343dcf5451SChristoph Hellwig __u8 name_len; /* Name length */ 11353dcf5451SChristoph Hellwig __u8 file_type; 11363dcf5451SChristoph Hellwig char name[EXT4_NAME_LEN]; /* File name */ 11373dcf5451SChristoph Hellwig }; 11383dcf5451SChristoph Hellwig 11393dcf5451SChristoph Hellwig /* 11403dcf5451SChristoph Hellwig * Ext4 directory file types. Only the low 3 bits are used. The 11413dcf5451SChristoph Hellwig * other bits are reserved for now. 11423dcf5451SChristoph Hellwig */ 11433dcf5451SChristoph Hellwig #define EXT4_FT_UNKNOWN 0 11443dcf5451SChristoph Hellwig #define EXT4_FT_REG_FILE 1 11453dcf5451SChristoph Hellwig #define EXT4_FT_DIR 2 11463dcf5451SChristoph Hellwig #define EXT4_FT_CHRDEV 3 11473dcf5451SChristoph Hellwig #define EXT4_FT_BLKDEV 4 11483dcf5451SChristoph Hellwig #define EXT4_FT_FIFO 5 11493dcf5451SChristoph Hellwig #define EXT4_FT_SOCK 6 11503dcf5451SChristoph Hellwig #define EXT4_FT_SYMLINK 7 11513dcf5451SChristoph Hellwig 11523dcf5451SChristoph Hellwig #define EXT4_FT_MAX 8 11533dcf5451SChristoph Hellwig 11543dcf5451SChristoph Hellwig /* 11553dcf5451SChristoph Hellwig * EXT4_DIR_PAD defines the directory entries boundaries 11563dcf5451SChristoph Hellwig * 11573dcf5451SChristoph Hellwig * NOTE: It must be a multiple of 4 11583dcf5451SChristoph Hellwig */ 11593dcf5451SChristoph Hellwig #define EXT4_DIR_PAD 4 11603dcf5451SChristoph Hellwig #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 11613dcf5451SChristoph Hellwig #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 11623dcf5451SChristoph Hellwig ~EXT4_DIR_ROUND) 11633dcf5451SChristoph Hellwig #define EXT4_MAX_REC_LEN ((1<<16)-1) 11643dcf5451SChristoph Hellwig 11653dcf5451SChristoph Hellwig /* 11663dcf5451SChristoph Hellwig * Hash Tree Directory indexing 11673dcf5451SChristoph Hellwig * (c) Daniel Phillips, 2001 11683dcf5451SChristoph Hellwig */ 11693dcf5451SChristoph Hellwig 11703dcf5451SChristoph Hellwig #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 11713dcf5451SChristoph Hellwig EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 11723dcf5451SChristoph Hellwig (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) 11733dcf5451SChristoph Hellwig #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 11743dcf5451SChristoph Hellwig #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 11753dcf5451SChristoph Hellwig 11763dcf5451SChristoph Hellwig /* Legal values for the dx_root hash_version field: */ 11773dcf5451SChristoph Hellwig 11783dcf5451SChristoph Hellwig #define DX_HASH_LEGACY 0 11793dcf5451SChristoph Hellwig #define DX_HASH_HALF_MD4 1 11803dcf5451SChristoph Hellwig #define DX_HASH_TEA 2 1181f99b2589STheodore Ts'o #define DX_HASH_LEGACY_UNSIGNED 3 1182f99b2589STheodore Ts'o #define DX_HASH_HALF_MD4_UNSIGNED 4 1183f99b2589STheodore Ts'o #define DX_HASH_TEA_UNSIGNED 5 11843dcf5451SChristoph Hellwig 11853dcf5451SChristoph Hellwig #ifdef __KERNEL__ 11863dcf5451SChristoph Hellwig 11873dcf5451SChristoph Hellwig /* hash info structure used by the directory hash */ 11883dcf5451SChristoph Hellwig struct dx_hash_info 11893dcf5451SChristoph Hellwig { 11903dcf5451SChristoph Hellwig u32 hash; 11913dcf5451SChristoph Hellwig u32 minor_hash; 11923dcf5451SChristoph Hellwig int hash_version; 11933dcf5451SChristoph Hellwig u32 *seed; 11943dcf5451SChristoph Hellwig }; 11953dcf5451SChristoph Hellwig 11963dcf5451SChristoph Hellwig #define EXT4_HTREE_EOF 0x7fffffff 11973dcf5451SChristoph Hellwig 11983dcf5451SChristoph Hellwig /* 11993dcf5451SChristoph Hellwig * Control parameters used by ext4_htree_next_block 12003dcf5451SChristoph Hellwig */ 12013dcf5451SChristoph Hellwig #define HASH_NB_ALWAYS 1 12023dcf5451SChristoph Hellwig 12033dcf5451SChristoph Hellwig 12043dcf5451SChristoph Hellwig /* 12053dcf5451SChristoph Hellwig * Describe an inode's exact location on disk and in memory 12063dcf5451SChristoph Hellwig */ 12073dcf5451SChristoph Hellwig struct ext4_iloc 12083dcf5451SChristoph Hellwig { 12093dcf5451SChristoph Hellwig struct buffer_head *bh; 12103dcf5451SChristoph Hellwig unsigned long offset; 12113dcf5451SChristoph Hellwig ext4_group_t block_group; 12123dcf5451SChristoph Hellwig }; 12133dcf5451SChristoph Hellwig 12143dcf5451SChristoph Hellwig static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 12153dcf5451SChristoph Hellwig { 12163dcf5451SChristoph Hellwig return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 12173dcf5451SChristoph Hellwig } 12183dcf5451SChristoph Hellwig 12193dcf5451SChristoph Hellwig /* 12203dcf5451SChristoph Hellwig * This structure is stuffed into the struct file's private_data field 12213dcf5451SChristoph Hellwig * for directories. It is where we put information so that we can do 12223dcf5451SChristoph Hellwig * readdir operations in hash tree order. 12233dcf5451SChristoph Hellwig */ 12243dcf5451SChristoph Hellwig struct dir_private_info { 12253dcf5451SChristoph Hellwig struct rb_root root; 12263dcf5451SChristoph Hellwig struct rb_node *curr_node; 12273dcf5451SChristoph Hellwig struct fname *extra_fname; 12283dcf5451SChristoph Hellwig loff_t last_pos; 12293dcf5451SChristoph Hellwig __u32 curr_hash; 12303dcf5451SChristoph Hellwig __u32 curr_minor_hash; 12313dcf5451SChristoph Hellwig __u32 next_hash; 12323dcf5451SChristoph Hellwig }; 12333dcf5451SChristoph Hellwig 12343dcf5451SChristoph Hellwig /* calculate the first block number of the group */ 12353dcf5451SChristoph Hellwig static inline ext4_fsblk_t 12363dcf5451SChristoph Hellwig ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 12373dcf5451SChristoph Hellwig { 12383dcf5451SChristoph Hellwig return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 12393dcf5451SChristoph Hellwig le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 12403dcf5451SChristoph Hellwig } 12413dcf5451SChristoph Hellwig 12423dcf5451SChristoph Hellwig /* 12433dcf5451SChristoph Hellwig * Special error return code only used by dx_probe() and its callers. 12443dcf5451SChristoph Hellwig */ 12453dcf5451SChristoph Hellwig #define ERR_BAD_DX_DIR -75000 12463dcf5451SChristoph Hellwig 12473dcf5451SChristoph Hellwig void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1248a9df9a49STheodore Ts'o ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 12493dcf5451SChristoph Hellwig 12509f6200bbSTheodore Ts'o extern struct proc_dir_entry *ext4_proc_root; 12519f6200bbSTheodore Ts'o 12523dcf5451SChristoph Hellwig /* 12533dcf5451SChristoph Hellwig * Function prototypes 12543dcf5451SChristoph Hellwig */ 12553dcf5451SChristoph Hellwig 12563dcf5451SChristoph Hellwig /* 12573dcf5451SChristoph Hellwig * Ok, these declarations are also in <linux/kernel.h> but none of the 12583dcf5451SChristoph Hellwig * ext4 source programs needs to include it so they are duplicated here. 12593dcf5451SChristoph Hellwig */ 12603dcf5451SChristoph Hellwig # define NORET_TYPE /**/ 12613dcf5451SChristoph Hellwig # define ATTRIB_NORET __attribute__((noreturn)) 12623dcf5451SChristoph Hellwig # define NORET_AND noreturn, 12633dcf5451SChristoph Hellwig 1264498e5f24STheodore Ts'o /* bitmap.c */ 1265498e5f24STheodore Ts'o extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 1266498e5f24STheodore Ts'o 12673dcf5451SChristoph Hellwig /* balloc.c */ 12683dcf5451SChristoph Hellwig extern unsigned int ext4_block_group(struct super_block *sb, 12693dcf5451SChristoph Hellwig ext4_fsblk_t blocknr); 12703dcf5451SChristoph Hellwig extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 12713dcf5451SChristoph Hellwig ext4_fsblk_t blocknr); 12723dcf5451SChristoph Hellwig extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 12733dcf5451SChristoph Hellwig extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 12743dcf5451SChristoph Hellwig ext4_group_t group); 12757061eba7SAneesh Kumar K.V extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 12763dcf5451SChristoph Hellwig ext4_fsblk_t goal, unsigned long *count, int *errp); 12775c791616SAneesh Kumar K.V extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 12788c3bf8a0SEric Sandeen extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 12793dcf5451SChristoph Hellwig extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 12803dcf5451SChristoph Hellwig ext4_fsblk_t block, unsigned long count, int metadata); 1281e21675d4SAneesh Kumar K.V extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, 1282e21675d4SAneesh Kumar K.V ext4_fsblk_t block, unsigned long count); 12833dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); 12843dcf5451SChristoph Hellwig extern void ext4_check_blocks_bitmap(struct super_block *); 12853dcf5451SChristoph Hellwig extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 12863dcf5451SChristoph Hellwig ext4_group_t block_group, 12873dcf5451SChristoph Hellwig struct buffer_head ** bh); 12883dcf5451SChristoph Hellwig extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1289bb23c20aSTheodore Ts'o struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1290bb23c20aSTheodore Ts'o ext4_group_t block_group); 1291bb23c20aSTheodore Ts'o extern unsigned ext4_init_block_bitmap(struct super_block *sb, 1292bb23c20aSTheodore Ts'o struct buffer_head *bh, 1293bb23c20aSTheodore Ts'o ext4_group_t group, 1294bb23c20aSTheodore Ts'o struct ext4_group_desc *desc); 1295bb23c20aSTheodore Ts'o #define ext4_free_blocks_after_init(sb, group, desc) \ 1296bb23c20aSTheodore Ts'o ext4_init_block_bitmap(sb, NULL, group, desc) 12973dcf5451SChristoph Hellwig 12983dcf5451SChristoph Hellwig /* dir.c */ 12993dcf5451SChristoph Hellwig extern int ext4_check_dir_entry(const char *, struct inode *, 13003dcf5451SChristoph Hellwig struct ext4_dir_entry_2 *, 1301498e5f24STheodore Ts'o struct buffer_head *, unsigned int); 13023dcf5451SChristoph Hellwig extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 13033dcf5451SChristoph Hellwig __u32 minor_hash, 13043dcf5451SChristoph Hellwig struct ext4_dir_entry_2 *dirent); 13053dcf5451SChristoph Hellwig extern void ext4_htree_free_dir_info(struct dir_private_info *p); 13063dcf5451SChristoph Hellwig 13073dcf5451SChristoph Hellwig /* fsync.c */ 13083dcf5451SChristoph Hellwig extern int ext4_sync_file(struct file *, struct dentry *, int); 13093dcf5451SChristoph Hellwig 13103dcf5451SChristoph Hellwig /* hash.c */ 13113dcf5451SChristoph Hellwig extern int ext4fs_dirhash(const char *name, int len, struct 13123dcf5451SChristoph Hellwig dx_hash_info *hinfo); 13133dcf5451SChristoph Hellwig 13143dcf5451SChristoph Hellwig /* ialloc.c */ 1315f157a4aaSTheodore Ts'o extern struct inode *ext4_new_inode(handle_t *, struct inode *, int, 131611013911SAndreas Dilger const struct qstr *qstr, __u32 goal); 13173dcf5451SChristoph Hellwig extern void ext4_free_inode(handle_t *, struct inode *); 13183dcf5451SChristoph Hellwig extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 13193dcf5451SChristoph Hellwig extern unsigned long ext4_count_free_inodes(struct super_block *); 13203dcf5451SChristoph Hellwig extern unsigned long ext4_count_dirs(struct super_block *); 13213dcf5451SChristoph Hellwig extern void ext4_check_inodes_bitmap(struct super_block *); 1322bb23c20aSTheodore Ts'o extern unsigned ext4_init_inode_bitmap(struct super_block *sb, 1323bb23c20aSTheodore Ts'o struct buffer_head *bh, 1324bb23c20aSTheodore Ts'o ext4_group_t group, 1325bb23c20aSTheodore Ts'o struct ext4_group_desc *desc); 1326bb23c20aSTheodore Ts'o extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 13273dcf5451SChristoph Hellwig 13283dcf5451SChristoph Hellwig /* mballoc.c */ 13293dcf5451SChristoph Hellwig extern long ext4_mb_stats; 13303dcf5451SChristoph Hellwig extern long ext4_mb_max_to_scan; 13313dcf5451SChristoph Hellwig extern int ext4_mb_init(struct super_block *, int); 13323dcf5451SChristoph Hellwig extern int ext4_mb_release(struct super_block *); 13333dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 13343dcf5451SChristoph Hellwig struct ext4_allocation_request *, int *); 13353dcf5451SChristoph Hellwig extern int ext4_mb_reserve_blocks(struct super_block *, int); 1336c2ea3fdeSTheodore Ts'o extern void ext4_discard_preallocations(struct inode *); 13373dcf5451SChristoph Hellwig extern int __init init_ext4_mballoc(void); 13383dcf5451SChristoph Hellwig extern void exit_ext4_mballoc(void); 13393dcf5451SChristoph Hellwig extern void ext4_mb_free_blocks(handle_t *, struct inode *, 13400610b6e9STheodore Ts'o ext4_fsblk_t, unsigned long, int, unsigned long *); 1341920313a7SAneesh Kumar K.V extern int ext4_mb_add_groupinfo(struct super_block *sb, 13425f21b0e6SFrederic Bohe ext4_group_t i, struct ext4_group_desc *desc); 13435f21b0e6SFrederic Bohe extern void ext4_mb_update_group_info(struct ext4_group_info *grp, 13445f21b0e6SFrederic Bohe ext4_grpblk_t add); 1345920313a7SAneesh Kumar K.V extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); 1346920313a7SAneesh Kumar K.V extern void ext4_mb_put_buddy_cache_lock(struct super_block *, 1347920313a7SAneesh Kumar K.V ext4_group_t, int); 13483dcf5451SChristoph Hellwig /* inode.c */ 13493dcf5451SChristoph Hellwig int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, 13503dcf5451SChristoph Hellwig struct buffer_head *bh, ext4_fsblk_t blocknr); 13513dcf5451SChristoph Hellwig struct buffer_head *ext4_getblk(handle_t *, struct inode *, 13523dcf5451SChristoph Hellwig ext4_lblk_t, int, int *); 13533dcf5451SChristoph Hellwig struct buffer_head *ext4_bread(handle_t *, struct inode *, 13543dcf5451SChristoph Hellwig ext4_lblk_t, int, int *); 13556873fa0dSEric Sandeen int ext4_get_block(struct inode *inode, sector_t iblock, 13566873fa0dSEric Sandeen struct buffer_head *bh_result, int create); 13573dcf5451SChristoph Hellwig 13583dcf5451SChristoph Hellwig extern struct inode *ext4_iget(struct super_block *, unsigned long); 13593dcf5451SChristoph Hellwig extern int ext4_write_inode(struct inode *, int); 13603dcf5451SChristoph Hellwig extern int ext4_setattr(struct dentry *, struct iattr *); 13613e3398a0SMingming Cao extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 13623e3398a0SMingming Cao struct kstat *stat); 13633dcf5451SChristoph Hellwig extern void ext4_delete_inode(struct inode *); 13643dcf5451SChristoph Hellwig extern int ext4_sync_inode(handle_t *, struct inode *); 13653dcf5451SChristoph Hellwig extern void ext4_dirty_inode(struct inode *); 13663dcf5451SChristoph Hellwig extern int ext4_change_inode_journal_flag(struct inode *, int); 13673dcf5451SChristoph Hellwig extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 136891ef4cafSDuane Griffin extern int ext4_can_truncate(struct inode *inode); 13693dcf5451SChristoph Hellwig extern void ext4_truncate(struct inode *); 13703dcf5451SChristoph Hellwig extern void ext4_set_inode_flags(struct inode *); 13713dcf5451SChristoph Hellwig extern void ext4_get_inode_flags(struct ext4_inode_info *); 1372ccd2506bSTheodore Ts'o extern int ext4_alloc_da_blocks(struct inode *inode); 13733dcf5451SChristoph Hellwig extern void ext4_set_aops(struct inode *inode); 13743dcf5451SChristoph Hellwig extern int ext4_writepage_trans_blocks(struct inode *); 1375a02908f1SMingming Cao extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); 1376f3bd1f3fSMingming Cao extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 1377cf108bcaSJan Kara extern int ext4_block_truncate_page(handle_t *handle, 13783dcf5451SChristoph Hellwig struct address_space *mapping, loff_t from); 1379c2ec175cSNick Piggin extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 138060e58e0fSMingming Cao extern qsize_t ext4_get_reserved_space(struct inode *inode); 13813dcf5451SChristoph Hellwig 13823dcf5451SChristoph Hellwig /* ioctl.c */ 13833dcf5451SChristoph Hellwig extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 13843dcf5451SChristoph Hellwig extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 13853dcf5451SChristoph Hellwig 13863dcf5451SChristoph Hellwig /* migrate.c */ 13872a43a878SAneesh Kumar K.V extern int ext4_ext_migrate(struct inode *); 13883d0518f4SWei Yongjun 13893dcf5451SChristoph Hellwig /* namei.c */ 13903d0518f4SWei Yongjun extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize); 13913d0518f4SWei Yongjun extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize); 13923dcf5451SChristoph Hellwig extern int ext4_orphan_add(handle_t *, struct inode *); 13933dcf5451SChristoph Hellwig extern int ext4_orphan_del(handle_t *, struct inode *); 13943dcf5451SChristoph Hellwig extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 13953dcf5451SChristoph Hellwig __u32 start_minor_hash, __u32 *next_hash); 13963dcf5451SChristoph Hellwig 13973dcf5451SChristoph Hellwig /* resize.c */ 13983dcf5451SChristoph Hellwig extern int ext4_group_add(struct super_block *sb, 13993dcf5451SChristoph Hellwig struct ext4_new_group_data *input); 14003dcf5451SChristoph Hellwig extern int ext4_group_extend(struct super_block *sb, 14013dcf5451SChristoph Hellwig struct ext4_super_block *es, 14023dcf5451SChristoph Hellwig ext4_fsblk_t n_blocks_count); 14033dcf5451SChristoph Hellwig 14043dcf5451SChristoph Hellwig /* super.c */ 14053dcf5451SChristoph Hellwig extern void ext4_error(struct super_block *, const char *, const char *, ...) 14063dcf5451SChristoph Hellwig __attribute__ ((format (printf, 3, 4))); 14073dcf5451SChristoph Hellwig extern void __ext4_std_error(struct super_block *, const char *, int); 14083dcf5451SChristoph Hellwig extern void ext4_abort(struct super_block *, const char *, const char *, ...) 14093dcf5451SChristoph Hellwig __attribute__ ((format (printf, 3, 4))); 14103dcf5451SChristoph Hellwig extern void ext4_warning(struct super_block *, const char *, const char *, ...) 14113dcf5451SChristoph Hellwig __attribute__ ((format (printf, 3, 4))); 1412b31e1552SEric Sandeen extern void ext4_msg(struct super_block *, const char *, const char *, ...) 1413b31e1552SEric Sandeen __attribute__ ((format (printf, 3, 4))); 14145d1b1b3fSAneesh Kumar K.V extern void ext4_grp_locked_error(struct super_block *, ext4_group_t, 14155d1b1b3fSAneesh Kumar K.V const char *, const char *, ...) 14165d1b1b3fSAneesh Kumar K.V __attribute__ ((format (printf, 4, 5))); 14173dcf5451SChristoph Hellwig extern void ext4_update_dynamic_rev(struct super_block *sb); 14183dcf5451SChristoph Hellwig extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 14193dcf5451SChristoph Hellwig __u32 compat); 14203dcf5451SChristoph Hellwig extern int ext4_update_rocompat_feature(handle_t *handle, 14213dcf5451SChristoph Hellwig struct super_block *sb, __u32 rocompat); 14223dcf5451SChristoph Hellwig extern int ext4_update_incompat_feature(handle_t *handle, 14233dcf5451SChristoph Hellwig struct super_block *sb, __u32 incompat); 14243dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 14253dcf5451SChristoph Hellwig struct ext4_group_desc *bg); 14263dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 14273dcf5451SChristoph Hellwig struct ext4_group_desc *bg); 14283dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 14293dcf5451SChristoph Hellwig struct ext4_group_desc *bg); 1430560671a0SAneesh Kumar K.V extern __u32 ext4_free_blks_count(struct super_block *sb, 1431560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 1432560671a0SAneesh Kumar K.V extern __u32 ext4_free_inodes_count(struct super_block *sb, 1433560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 1434560671a0SAneesh Kumar K.V extern __u32 ext4_used_dirs_count(struct super_block *sb, 1435560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 1436560671a0SAneesh Kumar K.V extern __u32 ext4_itable_unused_count(struct super_block *sb, 1437560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 14383dcf5451SChristoph Hellwig extern void ext4_block_bitmap_set(struct super_block *sb, 14393dcf5451SChristoph Hellwig struct ext4_group_desc *bg, ext4_fsblk_t blk); 14403dcf5451SChristoph Hellwig extern void ext4_inode_bitmap_set(struct super_block *sb, 14413dcf5451SChristoph Hellwig struct ext4_group_desc *bg, ext4_fsblk_t blk); 14423dcf5451SChristoph Hellwig extern void ext4_inode_table_set(struct super_block *sb, 14433dcf5451SChristoph Hellwig struct ext4_group_desc *bg, ext4_fsblk_t blk); 1444560671a0SAneesh Kumar K.V extern void ext4_free_blks_set(struct super_block *sb, 1445560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count); 1446560671a0SAneesh Kumar K.V extern void ext4_free_inodes_set(struct super_block *sb, 1447560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count); 1448560671a0SAneesh Kumar K.V extern void ext4_used_dirs_set(struct super_block *sb, 1449560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count); 1450560671a0SAneesh Kumar K.V extern void ext4_itable_unused_set(struct super_block *sb, 1451560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count); 1452bb23c20aSTheodore Ts'o extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, 1453bb23c20aSTheodore Ts'o struct ext4_group_desc *gdp); 1454bb23c20aSTheodore Ts'o extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, 1455bb23c20aSTheodore Ts'o struct ext4_group_desc *gdp); 14563dcf5451SChristoph Hellwig 14573dcf5451SChristoph Hellwig static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 14583dcf5451SChristoph Hellwig { 14593dcf5451SChristoph Hellwig return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 14603dcf5451SChristoph Hellwig le32_to_cpu(es->s_blocks_count_lo); 14613dcf5451SChristoph Hellwig } 14623dcf5451SChristoph Hellwig 14633dcf5451SChristoph Hellwig static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 14643dcf5451SChristoph Hellwig { 14653dcf5451SChristoph Hellwig return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 14663dcf5451SChristoph Hellwig le32_to_cpu(es->s_r_blocks_count_lo); 14673dcf5451SChristoph Hellwig } 14683dcf5451SChristoph Hellwig 14693dcf5451SChristoph Hellwig static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 14703dcf5451SChristoph Hellwig { 14713dcf5451SChristoph Hellwig return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 14723dcf5451SChristoph Hellwig le32_to_cpu(es->s_free_blocks_count_lo); 14733dcf5451SChristoph Hellwig } 14743dcf5451SChristoph Hellwig 14753dcf5451SChristoph Hellwig static inline void ext4_blocks_count_set(struct ext4_super_block *es, 14763dcf5451SChristoph Hellwig ext4_fsblk_t blk) 14773dcf5451SChristoph Hellwig { 14783dcf5451SChristoph Hellwig es->s_blocks_count_lo = cpu_to_le32((u32)blk); 14793dcf5451SChristoph Hellwig es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 14803dcf5451SChristoph Hellwig } 14813dcf5451SChristoph Hellwig 14823dcf5451SChristoph Hellwig static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 14833dcf5451SChristoph Hellwig ext4_fsblk_t blk) 14843dcf5451SChristoph Hellwig { 14853dcf5451SChristoph Hellwig es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 14863dcf5451SChristoph Hellwig es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 14873dcf5451SChristoph Hellwig } 14883dcf5451SChristoph Hellwig 14893dcf5451SChristoph Hellwig static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 14903dcf5451SChristoph Hellwig ext4_fsblk_t blk) 14913dcf5451SChristoph Hellwig { 14923dcf5451SChristoph Hellwig es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 14933dcf5451SChristoph Hellwig es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 14943dcf5451SChristoph Hellwig } 14953dcf5451SChristoph Hellwig 14963dcf5451SChristoph Hellwig static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 14973dcf5451SChristoph Hellwig { 149806a279d6STheodore Ts'o if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 14993dcf5451SChristoph Hellwig return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 15003dcf5451SChristoph Hellwig le32_to_cpu(raw_inode->i_size_lo); 150106a279d6STheodore Ts'o else 150206a279d6STheodore Ts'o return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 15033dcf5451SChristoph Hellwig } 15043dcf5451SChristoph Hellwig 15053dcf5451SChristoph Hellwig static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 15063dcf5451SChristoph Hellwig { 15073dcf5451SChristoph Hellwig raw_inode->i_size_lo = cpu_to_le32(i_size); 15083dcf5451SChristoph Hellwig raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 15093dcf5451SChristoph Hellwig } 15103dcf5451SChristoph Hellwig 15113dcf5451SChristoph Hellwig static inline 15123dcf5451SChristoph Hellwig struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 15133dcf5451SChristoph Hellwig ext4_group_t group) 15143dcf5451SChristoph Hellwig { 15153dcf5451SChristoph Hellwig struct ext4_group_info ***grp_info; 15163dcf5451SChristoph Hellwig long indexv, indexh; 15173dcf5451SChristoph Hellwig grp_info = EXT4_SB(sb)->s_group_info; 15183dcf5451SChristoph Hellwig indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 15193dcf5451SChristoph Hellwig indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 15203dcf5451SChristoph Hellwig return grp_info[indexv][indexh]; 15213dcf5451SChristoph Hellwig } 15223dcf5451SChristoph Hellwig 15238df9675fSTheodore Ts'o /* 15248df9675fSTheodore Ts'o * Reading s_groups_count requires using smp_rmb() afterwards. See 15258df9675fSTheodore Ts'o * the locking protocol documented in the comments of ext4_group_add() 15268df9675fSTheodore Ts'o * in resize.c 15278df9675fSTheodore Ts'o */ 15288df9675fSTheodore Ts'o static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 15298df9675fSTheodore Ts'o { 15308df9675fSTheodore Ts'o ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 15318df9675fSTheodore Ts'o 15328df9675fSTheodore Ts'o smp_rmb(); 15338df9675fSTheodore Ts'o return ngroups; 15348df9675fSTheodore Ts'o } 15353dcf5451SChristoph Hellwig 1536772cb7c8SJose R. Santos static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 1537772cb7c8SJose R. Santos ext4_group_t block_group) 1538772cb7c8SJose R. Santos { 1539772cb7c8SJose R. Santos return block_group >> sbi->s_log_groups_per_flex; 1540772cb7c8SJose R. Santos } 1541772cb7c8SJose R. Santos 1542772cb7c8SJose R. Santos static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 1543772cb7c8SJose R. Santos { 1544772cb7c8SJose R. Santos return 1 << sbi->s_log_groups_per_flex; 1545772cb7c8SJose R. Santos } 1546772cb7c8SJose R. Santos 15473dcf5451SChristoph Hellwig #define ext4_std_error(sb, errno) \ 15483dcf5451SChristoph Hellwig do { \ 15493dcf5451SChristoph Hellwig if ((errno)) \ 15504db9c54aSStoyan Gaydarov __ext4_std_error((sb), __func__, (errno)); \ 15513dcf5451SChristoph Hellwig } while (0) 15523dcf5451SChristoph Hellwig 1553a30d542aSAneesh Kumar K.V #ifdef CONFIG_SMP 1554179f7ebfSEric Dumazet /* Each CPU can accumulate percpu_counter_batch blocks in their local 1555a30d542aSAneesh Kumar K.V * counters. So we need to make sure we have free blocks more 1556179f7ebfSEric Dumazet * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 1557a30d542aSAneesh Kumar K.V */ 1558179f7ebfSEric Dumazet #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 1559a30d542aSAneesh Kumar K.V #else 1560a30d542aSAneesh Kumar K.V #define EXT4_FREEBLOCKS_WATERMARK 0 1561a30d542aSAneesh Kumar K.V #endif 1562a30d542aSAneesh Kumar K.V 1563cf17fea6SAneesh Kumar K.V static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 1564cf17fea6SAneesh Kumar K.V { 1565cf17fea6SAneesh Kumar K.V /* 1566cf17fea6SAneesh Kumar K.V * XXX: replace with spinlock if seen contended -bzzz 1567cf17fea6SAneesh Kumar K.V */ 1568cf17fea6SAneesh Kumar K.V down_write(&EXT4_I(inode)->i_data_sem); 1569cf17fea6SAneesh Kumar K.V if (newsize > EXT4_I(inode)->i_disksize) 1570cf17fea6SAneesh Kumar K.V EXT4_I(inode)->i_disksize = newsize; 1571cf17fea6SAneesh Kumar K.V up_write(&EXT4_I(inode)->i_data_sem); 1572cf17fea6SAneesh Kumar K.V return ; 1573cf17fea6SAneesh Kumar K.V } 1574a30d542aSAneesh Kumar K.V 15755d1b1b3fSAneesh Kumar K.V struct ext4_group_info { 15765d1b1b3fSAneesh Kumar K.V unsigned long bb_state; 15775d1b1b3fSAneesh Kumar K.V struct rb_root bb_free_root; 15785d1b1b3fSAneesh Kumar K.V unsigned short bb_first_free; 15795d1b1b3fSAneesh Kumar K.V unsigned short bb_free; 15805d1b1b3fSAneesh Kumar K.V unsigned short bb_fragments; 15815d1b1b3fSAneesh Kumar K.V struct list_head bb_prealloc_list; 15825d1b1b3fSAneesh Kumar K.V #ifdef DOUBLE_CHECK 15835d1b1b3fSAneesh Kumar K.V void *bb_bitmap; 15845d1b1b3fSAneesh Kumar K.V #endif 15855d1b1b3fSAneesh Kumar K.V struct rw_semaphore alloc_sem; 15865d1b1b3fSAneesh Kumar K.V unsigned short bb_counters[]; 15875d1b1b3fSAneesh Kumar K.V }; 15885d1b1b3fSAneesh Kumar K.V 15895d1b1b3fSAneesh Kumar K.V #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 15905d1b1b3fSAneesh Kumar K.V 15915d1b1b3fSAneesh Kumar K.V #define EXT4_MB_GRP_NEED_INIT(grp) \ 15925d1b1b3fSAneesh Kumar K.V (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 15935d1b1b3fSAneesh Kumar K.V 1594955ce5f5SAneesh Kumar K.V static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 1595955ce5f5SAneesh Kumar K.V ext4_group_t group) 1596955ce5f5SAneesh Kumar K.V { 1597955ce5f5SAneesh Kumar K.V return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 1598955ce5f5SAneesh Kumar K.V } 1599955ce5f5SAneesh Kumar K.V 16005d1b1b3fSAneesh Kumar K.V static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 16015d1b1b3fSAneesh Kumar K.V { 1602955ce5f5SAneesh Kumar K.V spin_lock(ext4_group_lock_ptr(sb, group)); 16035d1b1b3fSAneesh Kumar K.V } 16045d1b1b3fSAneesh Kumar K.V 16055d1b1b3fSAneesh Kumar K.V static inline void ext4_unlock_group(struct super_block *sb, 16065d1b1b3fSAneesh Kumar K.V ext4_group_t group) 16075d1b1b3fSAneesh Kumar K.V { 1608955ce5f5SAneesh Kumar K.V spin_unlock(ext4_group_lock_ptr(sb, group)); 16095d1b1b3fSAneesh Kumar K.V } 16105d1b1b3fSAneesh Kumar K.V 16113dcf5451SChristoph Hellwig /* 16123dcf5451SChristoph Hellwig * Inodes and files operations 16133dcf5451SChristoph Hellwig */ 16143dcf5451SChristoph Hellwig 16153dcf5451SChristoph Hellwig /* dir.c */ 16163dcf5451SChristoph Hellwig extern const struct file_operations ext4_dir_operations; 16173dcf5451SChristoph Hellwig 16183dcf5451SChristoph Hellwig /* file.c */ 16193dcf5451SChristoph Hellwig extern const struct inode_operations ext4_file_inode_operations; 16203dcf5451SChristoph Hellwig extern const struct file_operations ext4_file_operations; 16213dcf5451SChristoph Hellwig 16223dcf5451SChristoph Hellwig /* namei.c */ 16233dcf5451SChristoph Hellwig extern const struct inode_operations ext4_dir_inode_operations; 16243dcf5451SChristoph Hellwig extern const struct inode_operations ext4_special_inode_operations; 1625596397b7STheodore Ts'o extern struct dentry *ext4_get_parent(struct dentry *child); 16263dcf5451SChristoph Hellwig 16273dcf5451SChristoph Hellwig /* symlink.c */ 16283dcf5451SChristoph Hellwig extern const struct inode_operations ext4_symlink_inode_operations; 16293dcf5451SChristoph Hellwig extern const struct inode_operations ext4_fast_symlink_inode_operations; 16303dcf5451SChristoph Hellwig 16316fd058f7STheodore Ts'o /* block_validity */ 16326fd058f7STheodore Ts'o extern void ext4_release_system_zone(struct super_block *sb); 16336fd058f7STheodore Ts'o extern int ext4_setup_system_zone(struct super_block *sb); 16346fd058f7STheodore Ts'o extern int __init init_ext4_system_zone(void); 16356fd058f7STheodore Ts'o extern void exit_ext4_system_zone(void); 16366fd058f7STheodore Ts'o extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 16376fd058f7STheodore Ts'o ext4_fsblk_t start_blk, 16386fd058f7STheodore Ts'o unsigned int count); 16396fd058f7STheodore Ts'o 16403dcf5451SChristoph Hellwig /* extents.c */ 16413dcf5451SChristoph Hellwig extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 16423dcf5451SChristoph Hellwig extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 1643a02908f1SMingming Cao extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 1644a02908f1SMingming Cao int chunk); 16453dcf5451SChristoph Hellwig extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, 1646498e5f24STheodore Ts'o ext4_lblk_t iblock, unsigned int max_blocks, 1647c2177057STheodore Ts'o struct buffer_head *bh_result, int flags); 1648cf108bcaSJan Kara extern void ext4_ext_truncate(struct inode *); 16493dcf5451SChristoph Hellwig extern void ext4_ext_init(struct super_block *); 16503dcf5451SChristoph Hellwig extern void ext4_ext_release(struct super_block *); 16513dcf5451SChristoph Hellwig extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, 16523dcf5451SChristoph Hellwig loff_t len); 165312b7ac17STheodore Ts'o extern int ext4_get_blocks(handle_t *handle, struct inode *inode, 1654498e5f24STheodore Ts'o sector_t block, unsigned int max_blocks, 1655c2177057STheodore Ts'o struct buffer_head *bh, int flags); 16563a06d778SAneesh Kumar K.V extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 16573a06d778SAneesh Kumar K.V __u64 start, __u64 len); 1658748de673SAkira Fujita /* move_extent.c */ 1659748de673SAkira Fujita extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 1660748de673SAkira Fujita __u64 start_orig, __u64 start_donor, 1661748de673SAkira Fujita __u64 len, __u64 *moved_len); 1662748de673SAkira Fujita 16633a06d778SAneesh Kumar K.V 16642ccb5fb9SAneesh Kumar K.V /* 16652ccb5fb9SAneesh Kumar K.V * Add new method to test wether block and inode bitmaps are properly 16662ccb5fb9SAneesh Kumar K.V * initialized. With uninit_bg reading the block from disk is not enough 16672ccb5fb9SAneesh Kumar K.V * to mark the bitmap uptodate. We need to also zero-out the bitmap 16682ccb5fb9SAneesh Kumar K.V */ 16692ccb5fb9SAneesh Kumar K.V #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 16702ccb5fb9SAneesh Kumar K.V 16712ccb5fb9SAneesh Kumar K.V static inline int bitmap_uptodate(struct buffer_head *bh) 16722ccb5fb9SAneesh Kumar K.V { 16732ccb5fb9SAneesh Kumar K.V return (buffer_uptodate(bh) && 16742ccb5fb9SAneesh Kumar K.V test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 16752ccb5fb9SAneesh Kumar K.V } 16762ccb5fb9SAneesh Kumar K.V static inline void set_bitmap_uptodate(struct buffer_head *bh) 16772ccb5fb9SAneesh Kumar K.V { 16782ccb5fb9SAneesh Kumar K.V set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 16792ccb5fb9SAneesh Kumar K.V } 16802ccb5fb9SAneesh Kumar K.V 16813dcf5451SChristoph Hellwig #endif /* __KERNEL__ */ 16823dcf5451SChristoph Hellwig 16833dcf5451SChristoph Hellwig #endif /* _EXT4_H */ 1684