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> 243dcf5451SChristoph Hellwig #include "ext4_i.h" 253dcf5451SChristoph Hellwig 263dcf5451SChristoph Hellwig /* 278a35694eSShen Feng * The fourth extended filesystem constants/structures 283dcf5451SChristoph Hellwig */ 293dcf5451SChristoph Hellwig 303dcf5451SChristoph Hellwig /* 313dcf5451SChristoph Hellwig * Define EXT4FS_DEBUG to produce debug messages 323dcf5451SChristoph Hellwig */ 333dcf5451SChristoph Hellwig #undef EXT4FS_DEBUG 343dcf5451SChristoph Hellwig 353dcf5451SChristoph Hellwig /* 363dcf5451SChristoph Hellwig * Debug code 373dcf5451SChristoph Hellwig */ 383dcf5451SChristoph Hellwig #ifdef EXT4FS_DEBUG 393dcf5451SChristoph Hellwig #define ext4_debug(f, a...) \ 403dcf5451SChristoph Hellwig do { \ 413dcf5451SChristoph Hellwig printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 424db9c54aSStoyan Gaydarov __FILE__, __LINE__, __func__); \ 433dcf5451SChristoph Hellwig printk(KERN_DEBUG f, ## a); \ 443dcf5451SChristoph Hellwig } while (0) 453dcf5451SChristoph Hellwig #else 463dcf5451SChristoph Hellwig #define ext4_debug(f, a...) do {} while (0) 473dcf5451SChristoph Hellwig #endif 483dcf5451SChristoph Hellwig 493dcf5451SChristoph Hellwig /* prefer goal again. length */ 503dcf5451SChristoph Hellwig #define EXT4_MB_HINT_MERGE 1 513dcf5451SChristoph Hellwig /* blocks already reserved */ 523dcf5451SChristoph Hellwig #define EXT4_MB_HINT_RESERVED 2 533dcf5451SChristoph Hellwig /* metadata is being allocated */ 543dcf5451SChristoph Hellwig #define EXT4_MB_HINT_METADATA 4 553dcf5451SChristoph Hellwig /* first blocks in the file */ 563dcf5451SChristoph Hellwig #define EXT4_MB_HINT_FIRST 8 573dcf5451SChristoph Hellwig /* search for the best chunk */ 583dcf5451SChristoph Hellwig #define EXT4_MB_HINT_BEST 16 593dcf5451SChristoph Hellwig /* data is being allocated */ 603dcf5451SChristoph Hellwig #define EXT4_MB_HINT_DATA 32 613dcf5451SChristoph Hellwig /* don't preallocate (for tails) */ 623dcf5451SChristoph Hellwig #define EXT4_MB_HINT_NOPREALLOC 64 633dcf5451SChristoph Hellwig /* allocate for locality group */ 643dcf5451SChristoph Hellwig #define EXT4_MB_HINT_GROUP_ALLOC 128 653dcf5451SChristoph Hellwig /* allocate goal blocks or none */ 663dcf5451SChristoph Hellwig #define EXT4_MB_HINT_GOAL_ONLY 256 673dcf5451SChristoph Hellwig /* goal is meaningful */ 683dcf5451SChristoph Hellwig #define EXT4_MB_HINT_TRY_GOAL 512 69d2a17637SMingming Cao /* blocks already pre-reserved by delayed allocation */ 70d2a17637SMingming Cao #define EXT4_MB_DELALLOC_RESERVED 1024 71d2a17637SMingming Cao 723dcf5451SChristoph Hellwig 733dcf5451SChristoph Hellwig struct ext4_allocation_request { 743dcf5451SChristoph Hellwig /* target inode for block we're allocating */ 753dcf5451SChristoph Hellwig struct inode *inode; 763dcf5451SChristoph Hellwig /* logical block in target inode */ 773dcf5451SChristoph Hellwig ext4_lblk_t logical; 783dcf5451SChristoph Hellwig /* phys. target (a hint) */ 793dcf5451SChristoph Hellwig ext4_fsblk_t goal; 803dcf5451SChristoph Hellwig /* the closest logical allocated block to the left */ 813dcf5451SChristoph Hellwig ext4_lblk_t lleft; 823dcf5451SChristoph Hellwig /* phys. block for ^^^ */ 833dcf5451SChristoph Hellwig ext4_fsblk_t pleft; 843dcf5451SChristoph Hellwig /* the closest logical allocated block to the right */ 853dcf5451SChristoph Hellwig ext4_lblk_t lright; 863dcf5451SChristoph Hellwig /* phys. block for ^^^ */ 873dcf5451SChristoph Hellwig ext4_fsblk_t pright; 883dcf5451SChristoph Hellwig /* how many blocks we want to allocate */ 89498e5f24STheodore Ts'o unsigned int len; 903dcf5451SChristoph Hellwig /* flags. see above EXT4_MB_HINT_* */ 91498e5f24STheodore Ts'o unsigned int flags; 923dcf5451SChristoph Hellwig }; 933dcf5451SChristoph Hellwig 943dcf5451SChristoph Hellwig /* 953dcf5451SChristoph Hellwig * Special inodes numbers 963dcf5451SChristoph Hellwig */ 973dcf5451SChristoph Hellwig #define EXT4_BAD_INO 1 /* Bad blocks inode */ 983dcf5451SChristoph Hellwig #define EXT4_ROOT_INO 2 /* Root inode */ 993dcf5451SChristoph Hellwig #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 1003dcf5451SChristoph Hellwig #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 1013dcf5451SChristoph Hellwig #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 1023dcf5451SChristoph Hellwig #define EXT4_JOURNAL_INO 8 /* Journal inode */ 1033dcf5451SChristoph Hellwig 1043dcf5451SChristoph Hellwig /* First non-reserved inode for old ext4 filesystems */ 1053dcf5451SChristoph Hellwig #define EXT4_GOOD_OLD_FIRST_INO 11 1063dcf5451SChristoph Hellwig 1073dcf5451SChristoph Hellwig /* 1083dcf5451SChristoph Hellwig * Maximal count of links to a file 1093dcf5451SChristoph Hellwig */ 1103dcf5451SChristoph Hellwig #define EXT4_LINK_MAX 65000 1113dcf5451SChristoph Hellwig 1123dcf5451SChristoph Hellwig /* 1133dcf5451SChristoph Hellwig * Macro-instructions used to manage several block sizes 1143dcf5451SChristoph Hellwig */ 1153dcf5451SChristoph Hellwig #define EXT4_MIN_BLOCK_SIZE 1024 1163dcf5451SChristoph Hellwig #define EXT4_MAX_BLOCK_SIZE 65536 1173dcf5451SChristoph Hellwig #define EXT4_MIN_BLOCK_LOG_SIZE 10 1183dcf5451SChristoph Hellwig #ifdef __KERNEL__ 1193dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 1203dcf5451SChristoph Hellwig #else 1213dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 1223dcf5451SChristoph Hellwig #endif 1233dcf5451SChristoph Hellwig #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 1243dcf5451SChristoph Hellwig #ifdef __KERNEL__ 1253dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 1263dcf5451SChristoph Hellwig #else 1273dcf5451SChristoph Hellwig # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 1283dcf5451SChristoph Hellwig #endif 1293dcf5451SChristoph Hellwig #ifdef __KERNEL__ 1303dcf5451SChristoph Hellwig #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 1313dcf5451SChristoph Hellwig #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 1323dcf5451SChristoph Hellwig #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 1333dcf5451SChristoph Hellwig #else 1343dcf5451SChristoph Hellwig #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 1353dcf5451SChristoph Hellwig EXT4_GOOD_OLD_INODE_SIZE : \ 1363dcf5451SChristoph Hellwig (s)->s_inode_size) 1373dcf5451SChristoph Hellwig #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 1383dcf5451SChristoph Hellwig EXT4_GOOD_OLD_FIRST_INO : \ 1393dcf5451SChristoph Hellwig (s)->s_first_ino) 1403dcf5451SChristoph Hellwig #endif 1413dcf5451SChristoph Hellwig #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 1423dcf5451SChristoph Hellwig 1433dcf5451SChristoph Hellwig /* 1443dcf5451SChristoph Hellwig * Structure of a blocks group descriptor 1453dcf5451SChristoph Hellwig */ 1463dcf5451SChristoph Hellwig struct ext4_group_desc 1473dcf5451SChristoph Hellwig { 1483dcf5451SChristoph Hellwig __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 1493dcf5451SChristoph Hellwig __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 1503dcf5451SChristoph Hellwig __le32 bg_inode_table_lo; /* Inodes table block */ 151560671a0SAneesh Kumar K.V __le16 bg_free_blocks_count_lo;/* Free blocks count */ 152560671a0SAneesh Kumar K.V __le16 bg_free_inodes_count_lo;/* Free inodes count */ 153560671a0SAneesh Kumar K.V __le16 bg_used_dirs_count_lo; /* Directories count */ 1543dcf5451SChristoph Hellwig __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 1553dcf5451SChristoph Hellwig __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 156560671a0SAneesh Kumar K.V __le16 bg_itable_unused_lo; /* Unused inodes count */ 1573dcf5451SChristoph Hellwig __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 1583dcf5451SChristoph Hellwig __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 1593dcf5451SChristoph Hellwig __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 1603dcf5451SChristoph Hellwig __le32 bg_inode_table_hi; /* Inodes table block MSB */ 1613dcf5451SChristoph Hellwig __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 1623dcf5451SChristoph Hellwig __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 1633dcf5451SChristoph Hellwig __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 1643dcf5451SChristoph Hellwig __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 1653dcf5451SChristoph Hellwig __u32 bg_reserved2[3]; 1663dcf5451SChristoph Hellwig }; 1673dcf5451SChristoph Hellwig 168772cb7c8SJose R. Santos /* 169772cb7c8SJose R. Santos * Structure of a flex block group info 170772cb7c8SJose R. Santos */ 171772cb7c8SJose R. Santos 172772cb7c8SJose R. Santos struct flex_groups { 1739f24e420STheodore Ts'o atomic_t free_inodes; 1749f24e420STheodore Ts'o atomic_t free_blocks; 1757d39db14STheodore Ts'o atomic_t used_dirs; 176772cb7c8SJose R. Santos }; 177772cb7c8SJose R. Santos 1783dcf5451SChristoph Hellwig #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 1793dcf5451SChristoph Hellwig #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 1803dcf5451SChristoph Hellwig #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 1813dcf5451SChristoph Hellwig 1823dcf5451SChristoph Hellwig #ifdef __KERNEL__ 1833dcf5451SChristoph Hellwig #include "ext4_sb.h" 1843dcf5451SChristoph Hellwig #endif 1853dcf5451SChristoph Hellwig /* 1863dcf5451SChristoph Hellwig * Macro-instructions used to manage group descriptors 1873dcf5451SChristoph Hellwig */ 1883dcf5451SChristoph Hellwig #define EXT4_MIN_DESC_SIZE 32 1893dcf5451SChristoph Hellwig #define EXT4_MIN_DESC_SIZE_64BIT 64 1903dcf5451SChristoph Hellwig #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 1913dcf5451SChristoph Hellwig #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 1923dcf5451SChristoph Hellwig #ifdef __KERNEL__ 1933dcf5451SChristoph Hellwig # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 1943dcf5451SChristoph Hellwig # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 1953dcf5451SChristoph Hellwig # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 1963dcf5451SChristoph Hellwig # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 1973dcf5451SChristoph Hellwig #else 1983dcf5451SChristoph Hellwig # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 1993dcf5451SChristoph Hellwig # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 2003dcf5451SChristoph Hellwig # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 2013dcf5451SChristoph Hellwig #endif 2023dcf5451SChristoph Hellwig 2033dcf5451SChristoph Hellwig /* 2043dcf5451SChristoph Hellwig * Constants relative to the data blocks 2053dcf5451SChristoph Hellwig */ 2063dcf5451SChristoph Hellwig #define EXT4_NDIR_BLOCKS 12 2073dcf5451SChristoph Hellwig #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 2083dcf5451SChristoph Hellwig #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 2093dcf5451SChristoph Hellwig #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 2103dcf5451SChristoph Hellwig #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 2113dcf5451SChristoph Hellwig 2123dcf5451SChristoph Hellwig /* 2133dcf5451SChristoph Hellwig * Inode flags 2143dcf5451SChristoph Hellwig */ 2153dcf5451SChristoph Hellwig #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 2163dcf5451SChristoph Hellwig #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 2173dcf5451SChristoph Hellwig #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 2183dcf5451SChristoph Hellwig #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 2193dcf5451SChristoph Hellwig #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 2203dcf5451SChristoph Hellwig #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 2213dcf5451SChristoph Hellwig #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 2223dcf5451SChristoph Hellwig #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 2233dcf5451SChristoph Hellwig /* Reserved for compression usage... */ 2243dcf5451SChristoph Hellwig #define EXT4_DIRTY_FL 0x00000100 2253dcf5451SChristoph Hellwig #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 2263dcf5451SChristoph Hellwig #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 2273dcf5451SChristoph Hellwig #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 2283dcf5451SChristoph Hellwig /* End compression flags --- maybe not all used */ 2293dcf5451SChristoph Hellwig #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 2303dcf5451SChristoph Hellwig #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 2313dcf5451SChristoph Hellwig #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 2323dcf5451SChristoph Hellwig #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 2333dcf5451SChristoph Hellwig #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 2343dcf5451SChristoph Hellwig #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 2353dcf5451SChristoph Hellwig #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 2363dcf5451SChristoph Hellwig #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 2373dcf5451SChristoph Hellwig #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */ 2383dcf5451SChristoph Hellwig #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 2393dcf5451SChristoph Hellwig 2403dcf5451SChristoph Hellwig #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ 2414db46fc2SAneesh Kumar K.V #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */ 2423dcf5451SChristoph Hellwig 2438fa43a81SDuane Griffin /* Flags that should be inherited by new inodes from their parent. */ 2448fa43a81SDuane Griffin #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 2458fa43a81SDuane Griffin EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ 2468fa43a81SDuane Griffin EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 2478fa43a81SDuane Griffin EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 2488fa43a81SDuane Griffin EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 2498fa43a81SDuane Griffin 2502dc6b0d4SDuane Griffin /* Flags that are appropriate for regular files (all but dir-specific ones). */ 2512dc6b0d4SDuane Griffin #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 2522dc6b0d4SDuane Griffin 2532dc6b0d4SDuane Griffin /* Flags that are appropriate for non-directories/regular files. */ 2542dc6b0d4SDuane Griffin #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 2552dc6b0d4SDuane Griffin 2562dc6b0d4SDuane Griffin /* Mask out flags that are inappropriate for the given type of inode. */ 2572dc6b0d4SDuane Griffin static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 2582dc6b0d4SDuane Griffin { 2592dc6b0d4SDuane Griffin if (S_ISDIR(mode)) 2602dc6b0d4SDuane Griffin return flags; 2612dc6b0d4SDuane Griffin else if (S_ISREG(mode)) 2622dc6b0d4SDuane Griffin return flags & EXT4_REG_FLMASK; 2632dc6b0d4SDuane Griffin else 2642dc6b0d4SDuane Griffin return flags & EXT4_OTHER_FLMASK; 2652dc6b0d4SDuane Griffin } 2662dc6b0d4SDuane Griffin 2673dcf5451SChristoph Hellwig /* 2683dcf5451SChristoph Hellwig * Inode dynamic state flags 2693dcf5451SChristoph Hellwig */ 2703dcf5451SChristoph Hellwig #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */ 2713dcf5451SChristoph Hellwig #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */ 2723dcf5451SChristoph Hellwig #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */ 2733dcf5451SChristoph Hellwig #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ 2747d8f9f7dSTheodore Ts'o #define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */ 2753dcf5451SChristoph Hellwig 2763dcf5451SChristoph Hellwig /* Used to pass group descriptor data when online resize is done */ 2773dcf5451SChristoph Hellwig struct ext4_new_group_input { 2783dcf5451SChristoph Hellwig __u32 group; /* Group number for this data */ 2793dcf5451SChristoph Hellwig __u64 block_bitmap; /* Absolute block number of block bitmap */ 2803dcf5451SChristoph Hellwig __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 2813dcf5451SChristoph Hellwig __u64 inode_table; /* Absolute block number of inode table start */ 2823dcf5451SChristoph Hellwig __u32 blocks_count; /* Total number of blocks in this group */ 2833dcf5451SChristoph Hellwig __u16 reserved_blocks; /* Number of reserved blocks in this group */ 2843dcf5451SChristoph Hellwig __u16 unused; 2853dcf5451SChristoph Hellwig }; 2863dcf5451SChristoph Hellwig 2873dcf5451SChristoph Hellwig /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 2883dcf5451SChristoph Hellwig struct ext4_new_group_data { 2893dcf5451SChristoph Hellwig __u32 group; 2903dcf5451SChristoph Hellwig __u64 block_bitmap; 2913dcf5451SChristoph Hellwig __u64 inode_bitmap; 2923dcf5451SChristoph Hellwig __u64 inode_table; 2933dcf5451SChristoph Hellwig __u32 blocks_count; 2943dcf5451SChristoph Hellwig __u16 reserved_blocks; 2953dcf5451SChristoph Hellwig __u16 unused; 2963dcf5451SChristoph Hellwig __u32 free_blocks_count; 2973dcf5451SChristoph Hellwig }; 2983dcf5451SChristoph Hellwig 2993dcf5451SChristoph Hellwig /* 3003dcf5451SChristoph Hellwig * Following is used by preallocation code to tell get_blocks() that we 3013dcf5451SChristoph Hellwig * want uninitialzed extents. 3023dcf5451SChristoph Hellwig */ 3033dcf5451SChristoph Hellwig #define EXT4_CREATE_UNINITIALIZED_EXT 2 3043dcf5451SChristoph Hellwig 3053dcf5451SChristoph Hellwig /* 3063dcf5451SChristoph Hellwig * ioctl commands 3073dcf5451SChristoph Hellwig */ 3083dcf5451SChristoph Hellwig #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 3093dcf5451SChristoph Hellwig #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 3103dcf5451SChristoph Hellwig #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 3113dcf5451SChristoph Hellwig #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 3123dcf5451SChristoph Hellwig #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 3133dcf5451SChristoph Hellwig #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 3143dcf5451SChristoph Hellwig #ifdef CONFIG_JBD2_DEBUG 3153dcf5451SChristoph Hellwig #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 3163dcf5451SChristoph Hellwig #endif 3173dcf5451SChristoph Hellwig #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 3183dcf5451SChristoph Hellwig #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 3198eea80d5STheodore Ts'o #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 3208eea80d5STheodore Ts'o #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 3218eea80d5STheodore Ts'o #define EXT4_IOC_MIGRATE _IO('f', 9) 322ccd2506bSTheodore Ts'o /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 3238eea80d5STheodore Ts'o /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 324ccd2506bSTheodore Ts'o #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 3253dcf5451SChristoph Hellwig 3263dcf5451SChristoph Hellwig /* 3273dcf5451SChristoph Hellwig * ioctl commands in 32 bit emulation 3283dcf5451SChristoph Hellwig */ 3293dcf5451SChristoph Hellwig #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 3303dcf5451SChristoph Hellwig #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 3313dcf5451SChristoph Hellwig #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 3323dcf5451SChristoph Hellwig #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 3333dcf5451SChristoph Hellwig #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 3343dcf5451SChristoph Hellwig #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 3353dcf5451SChristoph Hellwig #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 3363dcf5451SChristoph Hellwig #ifdef CONFIG_JBD2_DEBUG 3373dcf5451SChristoph Hellwig #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 3383dcf5451SChristoph Hellwig #endif 3393dcf5451SChristoph Hellwig #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 3403dcf5451SChristoph Hellwig #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 3413dcf5451SChristoph Hellwig 3423dcf5451SChristoph Hellwig 3433dcf5451SChristoph Hellwig /* 3443dcf5451SChristoph Hellwig * Mount options 3453dcf5451SChristoph Hellwig */ 3463dcf5451SChristoph Hellwig struct ext4_mount_options { 3473dcf5451SChristoph Hellwig unsigned long s_mount_opt; 3483dcf5451SChristoph Hellwig uid_t s_resuid; 3493dcf5451SChristoph Hellwig gid_t s_resgid; 3503dcf5451SChristoph Hellwig unsigned long s_commit_interval; 35130773840STheodore Ts'o u32 s_min_batch_time, s_max_batch_time; 3523dcf5451SChristoph Hellwig #ifdef CONFIG_QUOTA 3533dcf5451SChristoph Hellwig int s_jquota_fmt; 3543dcf5451SChristoph Hellwig char *s_qf_names[MAXQUOTAS]; 3553dcf5451SChristoph Hellwig #endif 3563dcf5451SChristoph Hellwig }; 3573dcf5451SChristoph Hellwig 3583dcf5451SChristoph Hellwig /* 3593dcf5451SChristoph Hellwig * Structure of an inode on the disk 3603dcf5451SChristoph Hellwig */ 3613dcf5451SChristoph Hellwig struct ext4_inode { 3623dcf5451SChristoph Hellwig __le16 i_mode; /* File mode */ 3633dcf5451SChristoph Hellwig __le16 i_uid; /* Low 16 bits of Owner Uid */ 3643dcf5451SChristoph Hellwig __le32 i_size_lo; /* Size in bytes */ 3653dcf5451SChristoph Hellwig __le32 i_atime; /* Access time */ 3663dcf5451SChristoph Hellwig __le32 i_ctime; /* Inode Change time */ 3673dcf5451SChristoph Hellwig __le32 i_mtime; /* Modification time */ 3683dcf5451SChristoph Hellwig __le32 i_dtime; /* Deletion Time */ 3693dcf5451SChristoph Hellwig __le16 i_gid; /* Low 16 bits of Group Id */ 3703dcf5451SChristoph Hellwig __le16 i_links_count; /* Links count */ 3713dcf5451SChristoph Hellwig __le32 i_blocks_lo; /* Blocks count */ 3723dcf5451SChristoph Hellwig __le32 i_flags; /* File flags */ 3733dcf5451SChristoph Hellwig union { 3743dcf5451SChristoph Hellwig struct { 3753dcf5451SChristoph Hellwig __le32 l_i_version; 3763dcf5451SChristoph Hellwig } linux1; 3773dcf5451SChristoph Hellwig struct { 3783dcf5451SChristoph Hellwig __u32 h_i_translator; 3793dcf5451SChristoph Hellwig } hurd1; 3803dcf5451SChristoph Hellwig struct { 3813dcf5451SChristoph Hellwig __u32 m_i_reserved1; 3823dcf5451SChristoph Hellwig } masix1; 3833dcf5451SChristoph Hellwig } osd1; /* OS dependent 1 */ 3843dcf5451SChristoph Hellwig __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 3853dcf5451SChristoph Hellwig __le32 i_generation; /* File version (for NFS) */ 3863dcf5451SChristoph Hellwig __le32 i_file_acl_lo; /* File ACL */ 3873dcf5451SChristoph Hellwig __le32 i_size_high; 3883dcf5451SChristoph Hellwig __le32 i_obso_faddr; /* Obsoleted fragment address */ 3893dcf5451SChristoph Hellwig union { 3903dcf5451SChristoph Hellwig struct { 3913dcf5451SChristoph Hellwig __le16 l_i_blocks_high; /* were l_i_reserved1 */ 3923dcf5451SChristoph Hellwig __le16 l_i_file_acl_high; 3933dcf5451SChristoph Hellwig __le16 l_i_uid_high; /* these 2 fields */ 3943dcf5451SChristoph Hellwig __le16 l_i_gid_high; /* were reserved2[0] */ 3953dcf5451SChristoph Hellwig __u32 l_i_reserved2; 3963dcf5451SChristoph Hellwig } linux2; 3973dcf5451SChristoph Hellwig struct { 3983dcf5451SChristoph Hellwig __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 3993dcf5451SChristoph Hellwig __u16 h_i_mode_high; 4003dcf5451SChristoph Hellwig __u16 h_i_uid_high; 4013dcf5451SChristoph Hellwig __u16 h_i_gid_high; 4023dcf5451SChristoph Hellwig __u32 h_i_author; 4033dcf5451SChristoph Hellwig } hurd2; 4043dcf5451SChristoph Hellwig struct { 4053dcf5451SChristoph Hellwig __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 4063dcf5451SChristoph Hellwig __le16 m_i_file_acl_high; 4073dcf5451SChristoph Hellwig __u32 m_i_reserved2[2]; 4083dcf5451SChristoph Hellwig } masix2; 4093dcf5451SChristoph Hellwig } osd2; /* OS dependent 2 */ 4103dcf5451SChristoph Hellwig __le16 i_extra_isize; 4113dcf5451SChristoph Hellwig __le16 i_pad1; 4123dcf5451SChristoph Hellwig __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 4133dcf5451SChristoph Hellwig __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 4143dcf5451SChristoph Hellwig __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 4153dcf5451SChristoph Hellwig __le32 i_crtime; /* File Creation time */ 4163dcf5451SChristoph Hellwig __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 4173dcf5451SChristoph Hellwig __le32 i_version_hi; /* high 32 bits for 64-bit version */ 4183dcf5451SChristoph Hellwig }; 4193dcf5451SChristoph Hellwig 4203dcf5451SChristoph Hellwig 4213dcf5451SChristoph Hellwig #define EXT4_EPOCH_BITS 2 4223dcf5451SChristoph Hellwig #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 4233dcf5451SChristoph Hellwig #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 4243dcf5451SChristoph Hellwig 4253dcf5451SChristoph Hellwig /* 4263dcf5451SChristoph Hellwig * Extended fields will fit into an inode if the filesystem was formatted 4273dcf5451SChristoph Hellwig * with large inodes (-I 256 or larger) and there are not currently any EAs 4283dcf5451SChristoph Hellwig * consuming all of the available space. For new inodes we always reserve 4293dcf5451SChristoph Hellwig * enough space for the kernel's known extended fields, but for inodes 4303dcf5451SChristoph Hellwig * created with an old kernel this might not have been the case. None of 4313dcf5451SChristoph Hellwig * the extended inode fields is critical for correct filesystem operation. 4323dcf5451SChristoph Hellwig * This macro checks if a certain field fits in the inode. Note that 4333dcf5451SChristoph Hellwig * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 4343dcf5451SChristoph Hellwig */ 4353dcf5451SChristoph Hellwig #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 4363dcf5451SChristoph Hellwig ((offsetof(typeof(*ext4_inode), field) + \ 4373dcf5451SChristoph Hellwig sizeof((ext4_inode)->field)) \ 4383dcf5451SChristoph Hellwig <= (EXT4_GOOD_OLD_INODE_SIZE + \ 4393dcf5451SChristoph Hellwig (einode)->i_extra_isize)) \ 4403dcf5451SChristoph Hellwig 4413dcf5451SChristoph Hellwig static inline __le32 ext4_encode_extra_time(struct timespec *time) 4423dcf5451SChristoph Hellwig { 4433dcf5451SChristoph Hellwig return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 4443dcf5451SChristoph Hellwig time->tv_sec >> 32 : 0) | 4453dcf5451SChristoph Hellwig ((time->tv_nsec << 2) & EXT4_NSEC_MASK)); 4463dcf5451SChristoph Hellwig } 4473dcf5451SChristoph Hellwig 4483dcf5451SChristoph Hellwig static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 4493dcf5451SChristoph Hellwig { 4503dcf5451SChristoph Hellwig if (sizeof(time->tv_sec) > 4) 4513dcf5451SChristoph Hellwig time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 4523dcf5451SChristoph Hellwig << 32; 4533dcf5451SChristoph Hellwig time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2; 4543dcf5451SChristoph Hellwig } 4553dcf5451SChristoph Hellwig 4563dcf5451SChristoph Hellwig #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 4573dcf5451SChristoph Hellwig do { \ 4583dcf5451SChristoph Hellwig (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 4593dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 4603dcf5451SChristoph Hellwig (raw_inode)->xtime ## _extra = \ 4613dcf5451SChristoph Hellwig ext4_encode_extra_time(&(inode)->xtime); \ 4623dcf5451SChristoph Hellwig } while (0) 4633dcf5451SChristoph Hellwig 4643dcf5451SChristoph Hellwig #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 4653dcf5451SChristoph Hellwig do { \ 4663dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 4673dcf5451SChristoph Hellwig (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 4683dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 4693dcf5451SChristoph Hellwig (raw_inode)->xtime ## _extra = \ 4703dcf5451SChristoph Hellwig ext4_encode_extra_time(&(einode)->xtime); \ 4713dcf5451SChristoph Hellwig } while (0) 4723dcf5451SChristoph Hellwig 4733dcf5451SChristoph Hellwig #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 4743dcf5451SChristoph Hellwig do { \ 4753dcf5451SChristoph Hellwig (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 4763dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 4773dcf5451SChristoph Hellwig ext4_decode_extra_time(&(inode)->xtime, \ 4783dcf5451SChristoph Hellwig raw_inode->xtime ## _extra); \ 4793dcf5451SChristoph Hellwig } while (0) 4803dcf5451SChristoph Hellwig 4813dcf5451SChristoph Hellwig #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 4823dcf5451SChristoph Hellwig do { \ 4833dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 4843dcf5451SChristoph Hellwig (einode)->xtime.tv_sec = \ 4853dcf5451SChristoph Hellwig (signed)le32_to_cpu((raw_inode)->xtime); \ 4863dcf5451SChristoph Hellwig if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 4873dcf5451SChristoph Hellwig ext4_decode_extra_time(&(einode)->xtime, \ 4883dcf5451SChristoph Hellwig raw_inode->xtime ## _extra); \ 4893dcf5451SChristoph Hellwig } while (0) 4903dcf5451SChristoph Hellwig 4913dcf5451SChristoph Hellwig #define i_disk_version osd1.linux1.l_i_version 4923dcf5451SChristoph Hellwig 4933dcf5451SChristoph Hellwig #if defined(__KERNEL__) || defined(__linux__) 4943dcf5451SChristoph Hellwig #define i_reserved1 osd1.linux1.l_i_reserved1 4953dcf5451SChristoph Hellwig #define i_file_acl_high osd2.linux2.l_i_file_acl_high 4963dcf5451SChristoph Hellwig #define i_blocks_high osd2.linux2.l_i_blocks_high 4973dcf5451SChristoph Hellwig #define i_uid_low i_uid 4983dcf5451SChristoph Hellwig #define i_gid_low i_gid 4993dcf5451SChristoph Hellwig #define i_uid_high osd2.linux2.l_i_uid_high 5003dcf5451SChristoph Hellwig #define i_gid_high osd2.linux2.l_i_gid_high 5013dcf5451SChristoph Hellwig #define i_reserved2 osd2.linux2.l_i_reserved2 5023dcf5451SChristoph Hellwig 5033dcf5451SChristoph Hellwig #elif defined(__GNU__) 5043dcf5451SChristoph Hellwig 5053dcf5451SChristoph Hellwig #define i_translator osd1.hurd1.h_i_translator 5063dcf5451SChristoph Hellwig #define i_uid_high osd2.hurd2.h_i_uid_high 5073dcf5451SChristoph Hellwig #define i_gid_high osd2.hurd2.h_i_gid_high 5083dcf5451SChristoph Hellwig #define i_author osd2.hurd2.h_i_author 5093dcf5451SChristoph Hellwig 5103dcf5451SChristoph Hellwig #elif defined(__masix__) 5113dcf5451SChristoph Hellwig 5123dcf5451SChristoph Hellwig #define i_reserved1 osd1.masix1.m_i_reserved1 5133dcf5451SChristoph Hellwig #define i_file_acl_high osd2.masix2.m_i_file_acl_high 5143dcf5451SChristoph Hellwig #define i_reserved2 osd2.masix2.m_i_reserved2 5153dcf5451SChristoph Hellwig 5163dcf5451SChristoph Hellwig #endif /* defined(__KERNEL__) || defined(__linux__) */ 5173dcf5451SChristoph Hellwig 5183dcf5451SChristoph Hellwig /* 5193dcf5451SChristoph Hellwig * File system states 5203dcf5451SChristoph Hellwig */ 5213dcf5451SChristoph Hellwig #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 5223dcf5451SChristoph Hellwig #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 5233dcf5451SChristoph Hellwig #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 5243dcf5451SChristoph Hellwig 5253dcf5451SChristoph Hellwig /* 5263dcf5451SChristoph Hellwig * Misc. filesystem flags 5273dcf5451SChristoph Hellwig */ 5283dcf5451SChristoph Hellwig #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 5293dcf5451SChristoph Hellwig #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 5303dcf5451SChristoph Hellwig #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 5313dcf5451SChristoph Hellwig 5323dcf5451SChristoph Hellwig /* 5333dcf5451SChristoph Hellwig * Mount flags 5343dcf5451SChristoph Hellwig */ 5353dcf5451SChristoph Hellwig #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 5363dcf5451SChristoph Hellwig #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 5373dcf5451SChristoph Hellwig #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 5383dcf5451SChristoph Hellwig #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 5393dcf5451SChristoph Hellwig #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 5403dcf5451SChristoph Hellwig #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 5413dcf5451SChristoph Hellwig #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 5423dcf5451SChristoph Hellwig #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 5433dcf5451SChristoph Hellwig #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */ 5443dcf5451SChristoph Hellwig #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 5453dcf5451SChristoph Hellwig #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 5463dcf5451SChristoph Hellwig #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 5473dcf5451SChristoph Hellwig #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 5483dcf5451SChristoph Hellwig #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 5493dcf5451SChristoph Hellwig #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 5503dcf5451SChristoph Hellwig #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 5513dcf5451SChristoph Hellwig #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 552afd4672dSTheodore Ts'o #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 5533dcf5451SChristoph Hellwig #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 5543dcf5451SChristoph Hellwig #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ 5553dcf5451SChristoph Hellwig #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 5563dcf5451SChristoph Hellwig #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 5573dcf5451SChristoph Hellwig #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 5583dcf5451SChristoph Hellwig #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 5593dcf5451SChristoph Hellwig #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 5603dcf5451SChristoph Hellwig #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 56164769240SAlex Tomas #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 5625bf5683aSHidehiro Kawai #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 5635bf5683aSHidehiro Kawai 5643dcf5451SChristoph Hellwig /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */ 5653dcf5451SChristoph Hellwig #ifndef _LINUX_EXT2_FS_H 5663dcf5451SChristoph Hellwig #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt 5673dcf5451SChristoph Hellwig #define set_opt(o, opt) o |= EXT4_MOUNT_##opt 5683dcf5451SChristoph Hellwig #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 5693dcf5451SChristoph Hellwig EXT4_MOUNT_##opt) 5703dcf5451SChristoph Hellwig #else 5713dcf5451SChristoph Hellwig #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD 5723dcf5451SChristoph Hellwig #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT 5733dcf5451SChristoph Hellwig #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS 5743dcf5451SChristoph Hellwig #endif 5753dcf5451SChristoph Hellwig 5763dcf5451SChristoph Hellwig #define ext4_set_bit ext2_set_bit 5773dcf5451SChristoph Hellwig #define ext4_set_bit_atomic ext2_set_bit_atomic 5783dcf5451SChristoph Hellwig #define ext4_clear_bit ext2_clear_bit 5793dcf5451SChristoph Hellwig #define ext4_clear_bit_atomic ext2_clear_bit_atomic 5803dcf5451SChristoph Hellwig #define ext4_test_bit ext2_test_bit 5813dcf5451SChristoph Hellwig #define ext4_find_first_zero_bit ext2_find_first_zero_bit 5823dcf5451SChristoph Hellwig #define ext4_find_next_zero_bit ext2_find_next_zero_bit 5833dcf5451SChristoph Hellwig #define ext4_find_next_bit ext2_find_next_bit 5843dcf5451SChristoph Hellwig 5853dcf5451SChristoph Hellwig /* 5863dcf5451SChristoph Hellwig * Maximal mount counts between two filesystem checks 5873dcf5451SChristoph Hellwig */ 5883dcf5451SChristoph Hellwig #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 5893dcf5451SChristoph Hellwig #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 5903dcf5451SChristoph Hellwig 5913dcf5451SChristoph Hellwig /* 5923dcf5451SChristoph Hellwig * Behaviour when detecting errors 5933dcf5451SChristoph Hellwig */ 5943dcf5451SChristoph Hellwig #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 5953dcf5451SChristoph Hellwig #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 5963dcf5451SChristoph Hellwig #define EXT4_ERRORS_PANIC 3 /* Panic */ 5973dcf5451SChristoph Hellwig #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 5983dcf5451SChristoph Hellwig 5993dcf5451SChristoph Hellwig /* 6003dcf5451SChristoph Hellwig * Structure of the super block 6013dcf5451SChristoph Hellwig */ 6023dcf5451SChristoph Hellwig struct ext4_super_block { 6033dcf5451SChristoph Hellwig /*00*/ __le32 s_inodes_count; /* Inodes count */ 6043dcf5451SChristoph Hellwig __le32 s_blocks_count_lo; /* Blocks count */ 6053dcf5451SChristoph Hellwig __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 6063dcf5451SChristoph Hellwig __le32 s_free_blocks_count_lo; /* Free blocks count */ 6073dcf5451SChristoph Hellwig /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 6083dcf5451SChristoph Hellwig __le32 s_first_data_block; /* First Data Block */ 6093dcf5451SChristoph Hellwig __le32 s_log_block_size; /* Block size */ 6103dcf5451SChristoph Hellwig __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ 6113dcf5451SChristoph Hellwig /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 6123dcf5451SChristoph Hellwig __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ 6133dcf5451SChristoph Hellwig __le32 s_inodes_per_group; /* # Inodes per group */ 6143dcf5451SChristoph Hellwig __le32 s_mtime; /* Mount time */ 6153dcf5451SChristoph Hellwig /*30*/ __le32 s_wtime; /* Write time */ 6163dcf5451SChristoph Hellwig __le16 s_mnt_count; /* Mount count */ 6173dcf5451SChristoph Hellwig __le16 s_max_mnt_count; /* Maximal mount count */ 6183dcf5451SChristoph Hellwig __le16 s_magic; /* Magic signature */ 6193dcf5451SChristoph Hellwig __le16 s_state; /* File system state */ 6203dcf5451SChristoph Hellwig __le16 s_errors; /* Behaviour when detecting errors */ 6213dcf5451SChristoph Hellwig __le16 s_minor_rev_level; /* minor revision level */ 6223dcf5451SChristoph Hellwig /*40*/ __le32 s_lastcheck; /* time of last check */ 6233dcf5451SChristoph Hellwig __le32 s_checkinterval; /* max. time between checks */ 6243dcf5451SChristoph Hellwig __le32 s_creator_os; /* OS */ 6253dcf5451SChristoph Hellwig __le32 s_rev_level; /* Revision level */ 6263dcf5451SChristoph Hellwig /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 6273dcf5451SChristoph Hellwig __le16 s_def_resgid; /* Default gid for reserved blocks */ 6283dcf5451SChristoph Hellwig /* 6293dcf5451SChristoph Hellwig * These fields are for EXT4_DYNAMIC_REV superblocks only. 6303dcf5451SChristoph Hellwig * 6313dcf5451SChristoph Hellwig * Note: the difference between the compatible feature set and 6323dcf5451SChristoph Hellwig * the incompatible feature set is that if there is a bit set 6333dcf5451SChristoph Hellwig * in the incompatible feature set that the kernel doesn't 6343dcf5451SChristoph Hellwig * know about, it should refuse to mount the filesystem. 6353dcf5451SChristoph Hellwig * 6363dcf5451SChristoph Hellwig * e2fsck's requirements are more strict; if it doesn't know 6373dcf5451SChristoph Hellwig * about a feature in either the compatible or incompatible 6383dcf5451SChristoph Hellwig * feature set, it must abort and not try to meddle with 6393dcf5451SChristoph Hellwig * things it doesn't understand... 6403dcf5451SChristoph Hellwig */ 6413dcf5451SChristoph Hellwig __le32 s_first_ino; /* First non-reserved inode */ 6423dcf5451SChristoph Hellwig __le16 s_inode_size; /* size of inode structure */ 6433dcf5451SChristoph Hellwig __le16 s_block_group_nr; /* block group # of this superblock */ 6443dcf5451SChristoph Hellwig __le32 s_feature_compat; /* compatible feature set */ 6453dcf5451SChristoph Hellwig /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 6463dcf5451SChristoph Hellwig __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 6473dcf5451SChristoph Hellwig /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 6483dcf5451SChristoph Hellwig /*78*/ char s_volume_name[16]; /* volume name */ 6493dcf5451SChristoph Hellwig /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 6503dcf5451SChristoph Hellwig /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 6513dcf5451SChristoph Hellwig /* 6523dcf5451SChristoph Hellwig * Performance hints. Directory preallocation should only 6533dcf5451SChristoph Hellwig * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 6543dcf5451SChristoph Hellwig */ 6553dcf5451SChristoph Hellwig __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 6563dcf5451SChristoph Hellwig __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 6573dcf5451SChristoph Hellwig __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 6583dcf5451SChristoph Hellwig /* 6593dcf5451SChristoph Hellwig * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 6603dcf5451SChristoph Hellwig */ 6613dcf5451SChristoph Hellwig /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 6623dcf5451SChristoph Hellwig /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 6633dcf5451SChristoph Hellwig __le32 s_journal_dev; /* device number of journal file */ 6643dcf5451SChristoph Hellwig __le32 s_last_orphan; /* start of list of inodes to delete */ 6653dcf5451SChristoph Hellwig __le32 s_hash_seed[4]; /* HTREE hash seed */ 6663dcf5451SChristoph Hellwig __u8 s_def_hash_version; /* Default hash version to use */ 6673dcf5451SChristoph Hellwig __u8 s_reserved_char_pad; 6683dcf5451SChristoph Hellwig __le16 s_desc_size; /* size of group descriptor */ 6693dcf5451SChristoph Hellwig /*100*/ __le32 s_default_mount_opts; 6703dcf5451SChristoph Hellwig __le32 s_first_meta_bg; /* First metablock block group */ 6713dcf5451SChristoph Hellwig __le32 s_mkfs_time; /* When the filesystem was created */ 6723dcf5451SChristoph Hellwig __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 6733dcf5451SChristoph Hellwig /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 6743dcf5451SChristoph Hellwig /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 6753dcf5451SChristoph Hellwig __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 6763dcf5451SChristoph Hellwig __le32 s_free_blocks_count_hi; /* Free blocks count */ 6773dcf5451SChristoph Hellwig __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 6783dcf5451SChristoph Hellwig __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 6793dcf5451SChristoph Hellwig __le32 s_flags; /* Miscellaneous flags */ 6803dcf5451SChristoph Hellwig __le16 s_raid_stride; /* RAID stride */ 6813dcf5451SChristoph Hellwig __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ 6823dcf5451SChristoph Hellwig __le64 s_mmp_block; /* Block for multi-mount protection */ 6833dcf5451SChristoph Hellwig __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 684772cb7c8SJose R. Santos __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 685772cb7c8SJose R. Santos __u8 s_reserved_char_pad2; 686772cb7c8SJose R. Santos __le16 s_reserved_pad; 687afc32f7eSTheodore Ts'o __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 688afc32f7eSTheodore Ts'o __u32 s_reserved[160]; /* Padding to the end of the block */ 6893dcf5451SChristoph Hellwig }; 6903dcf5451SChristoph Hellwig 6913dcf5451SChristoph Hellwig #ifdef __KERNEL__ 6923dcf5451SChristoph Hellwig static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 6933dcf5451SChristoph Hellwig { 6943dcf5451SChristoph Hellwig return sb->s_fs_info; 6953dcf5451SChristoph Hellwig } 6963dcf5451SChristoph Hellwig static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 6973dcf5451SChristoph Hellwig { 6983dcf5451SChristoph Hellwig return container_of(inode, struct ext4_inode_info, vfs_inode); 6993dcf5451SChristoph Hellwig } 7003dcf5451SChristoph Hellwig 7013dcf5451SChristoph Hellwig static inline struct timespec ext4_current_time(struct inode *inode) 7023dcf5451SChristoph Hellwig { 7033dcf5451SChristoph Hellwig return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 7043dcf5451SChristoph Hellwig current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 7053dcf5451SChristoph Hellwig } 7063dcf5451SChristoph Hellwig 7073dcf5451SChristoph Hellwig 7083dcf5451SChristoph Hellwig static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 7093dcf5451SChristoph Hellwig { 7103dcf5451SChristoph Hellwig return ino == EXT4_ROOT_INO || 7113dcf5451SChristoph Hellwig ino == EXT4_JOURNAL_INO || 7123dcf5451SChristoph Hellwig ino == EXT4_RESIZE_INO || 7133dcf5451SChristoph Hellwig (ino >= EXT4_FIRST_INO(sb) && 7143dcf5451SChristoph Hellwig ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 7153dcf5451SChristoph Hellwig } 7163dcf5451SChristoph Hellwig #else 7173dcf5451SChristoph Hellwig /* Assume that user mode programs are passing in an ext4fs superblock, not 7183dcf5451SChristoph Hellwig * a kernel struct super_block. This will allow us to call the feature-test 7193dcf5451SChristoph Hellwig * macros from user land. */ 7203dcf5451SChristoph Hellwig #define EXT4_SB(sb) (sb) 7213dcf5451SChristoph Hellwig #endif 7223dcf5451SChristoph Hellwig 7233dcf5451SChristoph Hellwig #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 7243dcf5451SChristoph Hellwig 7253dcf5451SChristoph Hellwig /* 7263dcf5451SChristoph Hellwig * Codes for operating systems 7273dcf5451SChristoph Hellwig */ 7283dcf5451SChristoph Hellwig #define EXT4_OS_LINUX 0 7293dcf5451SChristoph Hellwig #define EXT4_OS_HURD 1 7303dcf5451SChristoph Hellwig #define EXT4_OS_MASIX 2 7313dcf5451SChristoph Hellwig #define EXT4_OS_FREEBSD 3 7323dcf5451SChristoph Hellwig #define EXT4_OS_LITES 4 7333dcf5451SChristoph Hellwig 7343dcf5451SChristoph Hellwig /* 7353dcf5451SChristoph Hellwig * Revision levels 7363dcf5451SChristoph Hellwig */ 7373dcf5451SChristoph Hellwig #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 7383dcf5451SChristoph Hellwig #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 7393dcf5451SChristoph Hellwig 7403dcf5451SChristoph Hellwig #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 7413dcf5451SChristoph Hellwig #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 7423dcf5451SChristoph Hellwig 7433dcf5451SChristoph Hellwig #define EXT4_GOOD_OLD_INODE_SIZE 128 7443dcf5451SChristoph Hellwig 7453dcf5451SChristoph Hellwig /* 7463dcf5451SChristoph Hellwig * Feature set definitions 7473dcf5451SChristoph Hellwig */ 7483dcf5451SChristoph Hellwig 7493dcf5451SChristoph Hellwig #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 7503a06d778SAneesh Kumar K.V ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 7513dcf5451SChristoph Hellwig #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 7523a06d778SAneesh Kumar K.V ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 7533dcf5451SChristoph Hellwig #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 7543a06d778SAneesh Kumar K.V ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 7553dcf5451SChristoph Hellwig #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 7563dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 7573dcf5451SChristoph Hellwig #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 7583dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 7593dcf5451SChristoph Hellwig #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 7603dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 7613dcf5451SChristoph Hellwig #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 7623dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 7633dcf5451SChristoph Hellwig #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 7643dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 7653dcf5451SChristoph Hellwig #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 7663dcf5451SChristoph Hellwig EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 7673dcf5451SChristoph Hellwig 7683dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 7693dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 7703dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 7713dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 7723dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 7733dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 7743dcf5451SChristoph Hellwig 7753dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 7763dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 7773dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 7783dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 7793dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 7803dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 7813dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 7823dcf5451SChristoph Hellwig 7833dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 7843dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 7853dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 7863dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 7873dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 7883dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 7893dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 7903dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 7913dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 7923dcf5451SChristoph Hellwig 7933dcf5451SChristoph Hellwig #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 7943dcf5451SChristoph Hellwig #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 7953dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_RECOVER| \ 7963dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_META_BG| \ 7973dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_EXTENTS| \ 7983dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_64BIT| \ 7993dcf5451SChristoph Hellwig EXT4_FEATURE_INCOMPAT_FLEX_BG) 8003dcf5451SChristoph Hellwig #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 8013dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 8023dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 8033dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 8043dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 8053dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 8063dcf5451SChristoph Hellwig EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 8073dcf5451SChristoph Hellwig 8083dcf5451SChristoph Hellwig /* 8093dcf5451SChristoph Hellwig * Default values for user and/or group using reserved blocks 8103dcf5451SChristoph Hellwig */ 8113dcf5451SChristoph Hellwig #define EXT4_DEF_RESUID 0 8123dcf5451SChristoph Hellwig #define EXT4_DEF_RESGID 0 8133dcf5451SChristoph Hellwig 814240799cdSTheodore Ts'o #define EXT4_DEF_INODE_READAHEAD_BLKS 32 815240799cdSTheodore Ts'o 8163dcf5451SChristoph Hellwig /* 8173dcf5451SChristoph Hellwig * Default mount options 8183dcf5451SChristoph Hellwig */ 8193dcf5451SChristoph Hellwig #define EXT4_DEFM_DEBUG 0x0001 8203dcf5451SChristoph Hellwig #define EXT4_DEFM_BSDGROUPS 0x0002 8213dcf5451SChristoph Hellwig #define EXT4_DEFM_XATTR_USER 0x0004 8223dcf5451SChristoph Hellwig #define EXT4_DEFM_ACL 0x0008 8233dcf5451SChristoph Hellwig #define EXT4_DEFM_UID16 0x0010 8243dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE 0x0060 8253dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE_DATA 0x0020 8263dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE_ORDERED 0x0040 8273dcf5451SChristoph Hellwig #define EXT4_DEFM_JMODE_WBACK 0x0060 8283dcf5451SChristoph Hellwig 8293dcf5451SChristoph Hellwig /* 83030773840STheodore Ts'o * Default journal batch times 83130773840STheodore Ts'o */ 83230773840STheodore Ts'o #define EXT4_DEF_MIN_BATCH_TIME 0 83330773840STheodore Ts'o #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 83430773840STheodore Ts'o 83530773840STheodore Ts'o /* 836a4912123STheodore Ts'o * Minimum number of groups in a flexgroup before we separate out 837a4912123STheodore Ts'o * directories into the first block group of a flexgroup 838a4912123STheodore Ts'o */ 839a4912123STheodore Ts'o #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 840a4912123STheodore Ts'o 841a4912123STheodore Ts'o /* 8423dcf5451SChristoph Hellwig * Structure of a directory entry 8433dcf5451SChristoph Hellwig */ 8443dcf5451SChristoph Hellwig #define EXT4_NAME_LEN 255 8453dcf5451SChristoph Hellwig 8463dcf5451SChristoph Hellwig struct ext4_dir_entry { 8473dcf5451SChristoph Hellwig __le32 inode; /* Inode number */ 8483dcf5451SChristoph Hellwig __le16 rec_len; /* Directory entry length */ 8493dcf5451SChristoph Hellwig __le16 name_len; /* Name length */ 8503dcf5451SChristoph Hellwig char name[EXT4_NAME_LEN]; /* File name */ 8513dcf5451SChristoph Hellwig }; 8523dcf5451SChristoph Hellwig 8533dcf5451SChristoph Hellwig /* 8543dcf5451SChristoph Hellwig * The new version of the directory entry. Since EXT4 structures are 8553dcf5451SChristoph Hellwig * stored in intel byte order, and the name_len field could never be 8563dcf5451SChristoph Hellwig * bigger than 255 chars, it's safe to reclaim the extra byte for the 8573dcf5451SChristoph Hellwig * file_type field. 8583dcf5451SChristoph Hellwig */ 8593dcf5451SChristoph Hellwig struct ext4_dir_entry_2 { 8603dcf5451SChristoph Hellwig __le32 inode; /* Inode number */ 8613dcf5451SChristoph Hellwig __le16 rec_len; /* Directory entry length */ 8623dcf5451SChristoph Hellwig __u8 name_len; /* Name length */ 8633dcf5451SChristoph Hellwig __u8 file_type; 8643dcf5451SChristoph Hellwig char name[EXT4_NAME_LEN]; /* File name */ 8653dcf5451SChristoph Hellwig }; 8663dcf5451SChristoph Hellwig 8673dcf5451SChristoph Hellwig /* 8683dcf5451SChristoph Hellwig * Ext4 directory file types. Only the low 3 bits are used. The 8693dcf5451SChristoph Hellwig * other bits are reserved for now. 8703dcf5451SChristoph Hellwig */ 8713dcf5451SChristoph Hellwig #define EXT4_FT_UNKNOWN 0 8723dcf5451SChristoph Hellwig #define EXT4_FT_REG_FILE 1 8733dcf5451SChristoph Hellwig #define EXT4_FT_DIR 2 8743dcf5451SChristoph Hellwig #define EXT4_FT_CHRDEV 3 8753dcf5451SChristoph Hellwig #define EXT4_FT_BLKDEV 4 8763dcf5451SChristoph Hellwig #define EXT4_FT_FIFO 5 8773dcf5451SChristoph Hellwig #define EXT4_FT_SOCK 6 8783dcf5451SChristoph Hellwig #define EXT4_FT_SYMLINK 7 8793dcf5451SChristoph Hellwig 8803dcf5451SChristoph Hellwig #define EXT4_FT_MAX 8 8813dcf5451SChristoph Hellwig 8823dcf5451SChristoph Hellwig /* 8833dcf5451SChristoph Hellwig * EXT4_DIR_PAD defines the directory entries boundaries 8843dcf5451SChristoph Hellwig * 8853dcf5451SChristoph Hellwig * NOTE: It must be a multiple of 4 8863dcf5451SChristoph Hellwig */ 8873dcf5451SChristoph Hellwig #define EXT4_DIR_PAD 4 8883dcf5451SChristoph Hellwig #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 8893dcf5451SChristoph Hellwig #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 8903dcf5451SChristoph Hellwig ~EXT4_DIR_ROUND) 8913dcf5451SChristoph Hellwig #define EXT4_MAX_REC_LEN ((1<<16)-1) 8923dcf5451SChristoph Hellwig 8933dcf5451SChristoph Hellwig /* 8943dcf5451SChristoph Hellwig * Hash Tree Directory indexing 8953dcf5451SChristoph Hellwig * (c) Daniel Phillips, 2001 8963dcf5451SChristoph Hellwig */ 8973dcf5451SChristoph Hellwig 8983dcf5451SChristoph Hellwig #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 8993dcf5451SChristoph Hellwig EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 9003dcf5451SChristoph Hellwig (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) 9013dcf5451SChristoph Hellwig #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 9023dcf5451SChristoph Hellwig #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 9033dcf5451SChristoph Hellwig 9043dcf5451SChristoph Hellwig /* Legal values for the dx_root hash_version field: */ 9053dcf5451SChristoph Hellwig 9063dcf5451SChristoph Hellwig #define DX_HASH_LEGACY 0 9073dcf5451SChristoph Hellwig #define DX_HASH_HALF_MD4 1 9083dcf5451SChristoph Hellwig #define DX_HASH_TEA 2 909f99b2589STheodore Ts'o #define DX_HASH_LEGACY_UNSIGNED 3 910f99b2589STheodore Ts'o #define DX_HASH_HALF_MD4_UNSIGNED 4 911f99b2589STheodore Ts'o #define DX_HASH_TEA_UNSIGNED 5 9123dcf5451SChristoph Hellwig 9133dcf5451SChristoph Hellwig #ifdef __KERNEL__ 9143dcf5451SChristoph Hellwig 9153dcf5451SChristoph Hellwig /* hash info structure used by the directory hash */ 9163dcf5451SChristoph Hellwig struct dx_hash_info 9173dcf5451SChristoph Hellwig { 9183dcf5451SChristoph Hellwig u32 hash; 9193dcf5451SChristoph Hellwig u32 minor_hash; 9203dcf5451SChristoph Hellwig int hash_version; 9213dcf5451SChristoph Hellwig u32 *seed; 9223dcf5451SChristoph Hellwig }; 9233dcf5451SChristoph Hellwig 9243dcf5451SChristoph Hellwig #define EXT4_HTREE_EOF 0x7fffffff 9253dcf5451SChristoph Hellwig 9263dcf5451SChristoph Hellwig /* 9273dcf5451SChristoph Hellwig * Control parameters used by ext4_htree_next_block 9283dcf5451SChristoph Hellwig */ 9293dcf5451SChristoph Hellwig #define HASH_NB_ALWAYS 1 9303dcf5451SChristoph Hellwig 9313dcf5451SChristoph Hellwig 9323dcf5451SChristoph Hellwig /* 9333dcf5451SChristoph Hellwig * Describe an inode's exact location on disk and in memory 9343dcf5451SChristoph Hellwig */ 9353dcf5451SChristoph Hellwig struct ext4_iloc 9363dcf5451SChristoph Hellwig { 9373dcf5451SChristoph Hellwig struct buffer_head *bh; 9383dcf5451SChristoph Hellwig unsigned long offset; 9393dcf5451SChristoph Hellwig ext4_group_t block_group; 9403dcf5451SChristoph Hellwig }; 9413dcf5451SChristoph Hellwig 9423dcf5451SChristoph Hellwig static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 9433dcf5451SChristoph Hellwig { 9443dcf5451SChristoph Hellwig return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 9453dcf5451SChristoph Hellwig } 9463dcf5451SChristoph Hellwig 9473dcf5451SChristoph Hellwig /* 9483dcf5451SChristoph Hellwig * This structure is stuffed into the struct file's private_data field 9493dcf5451SChristoph Hellwig * for directories. It is where we put information so that we can do 9503dcf5451SChristoph Hellwig * readdir operations in hash tree order. 9513dcf5451SChristoph Hellwig */ 9523dcf5451SChristoph Hellwig struct dir_private_info { 9533dcf5451SChristoph Hellwig struct rb_root root; 9543dcf5451SChristoph Hellwig struct rb_node *curr_node; 9553dcf5451SChristoph Hellwig struct fname *extra_fname; 9563dcf5451SChristoph Hellwig loff_t last_pos; 9573dcf5451SChristoph Hellwig __u32 curr_hash; 9583dcf5451SChristoph Hellwig __u32 curr_minor_hash; 9593dcf5451SChristoph Hellwig __u32 next_hash; 9603dcf5451SChristoph Hellwig }; 9613dcf5451SChristoph Hellwig 9623dcf5451SChristoph Hellwig /* calculate the first block number of the group */ 9633dcf5451SChristoph Hellwig static inline ext4_fsblk_t 9643dcf5451SChristoph Hellwig ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 9653dcf5451SChristoph Hellwig { 9663dcf5451SChristoph Hellwig return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 9673dcf5451SChristoph Hellwig le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 9683dcf5451SChristoph Hellwig } 9693dcf5451SChristoph Hellwig 9703dcf5451SChristoph Hellwig /* 9713dcf5451SChristoph Hellwig * Special error return code only used by dx_probe() and its callers. 9723dcf5451SChristoph Hellwig */ 9733dcf5451SChristoph Hellwig #define ERR_BAD_DX_DIR -75000 9743dcf5451SChristoph Hellwig 9753dcf5451SChristoph Hellwig void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 976a9df9a49STheodore Ts'o ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 9773dcf5451SChristoph Hellwig 9789f6200bbSTheodore Ts'o extern struct proc_dir_entry *ext4_proc_root; 9799f6200bbSTheodore Ts'o 9803dcf5451SChristoph Hellwig /* 9813dcf5451SChristoph Hellwig * Function prototypes 9823dcf5451SChristoph Hellwig */ 9833dcf5451SChristoph Hellwig 9843dcf5451SChristoph Hellwig /* 9853dcf5451SChristoph Hellwig * Ok, these declarations are also in <linux/kernel.h> but none of the 9863dcf5451SChristoph Hellwig * ext4 source programs needs to include it so they are duplicated here. 9873dcf5451SChristoph Hellwig */ 9883dcf5451SChristoph Hellwig # define NORET_TYPE /**/ 9893dcf5451SChristoph Hellwig # define ATTRIB_NORET __attribute__((noreturn)) 9903dcf5451SChristoph Hellwig # define NORET_AND noreturn, 9913dcf5451SChristoph Hellwig 992498e5f24STheodore Ts'o /* bitmap.c */ 993498e5f24STheodore Ts'o extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 994498e5f24STheodore Ts'o 9953dcf5451SChristoph Hellwig /* balloc.c */ 9963dcf5451SChristoph Hellwig extern unsigned int ext4_block_group(struct super_block *sb, 9973dcf5451SChristoph Hellwig ext4_fsblk_t blocknr); 9983dcf5451SChristoph Hellwig extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 9993dcf5451SChristoph Hellwig ext4_fsblk_t blocknr); 10003dcf5451SChristoph Hellwig extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 10013dcf5451SChristoph Hellwig extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 10023dcf5451SChristoph Hellwig ext4_group_t group); 10037061eba7SAneesh Kumar K.V extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 10043dcf5451SChristoph Hellwig ext4_fsblk_t goal, unsigned long *count, int *errp); 10055c791616SAneesh Kumar K.V extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 10068c3bf8a0SEric Sandeen extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 10073dcf5451SChristoph Hellwig extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 10083dcf5451SChristoph Hellwig ext4_fsblk_t block, unsigned long count, int metadata); 1009e21675d4SAneesh Kumar K.V extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, 1010e21675d4SAneesh Kumar K.V ext4_fsblk_t block, unsigned long count); 10113dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); 10123dcf5451SChristoph Hellwig extern void ext4_check_blocks_bitmap(struct super_block *); 10133dcf5451SChristoph Hellwig extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 10143dcf5451SChristoph Hellwig ext4_group_t block_group, 10153dcf5451SChristoph Hellwig struct buffer_head ** bh); 10163dcf5451SChristoph Hellwig extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 10173dcf5451SChristoph Hellwig 10183dcf5451SChristoph Hellwig /* dir.c */ 10193dcf5451SChristoph Hellwig extern int ext4_check_dir_entry(const char *, struct inode *, 10203dcf5451SChristoph Hellwig struct ext4_dir_entry_2 *, 1021498e5f24STheodore Ts'o struct buffer_head *, unsigned int); 10223dcf5451SChristoph Hellwig extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 10233dcf5451SChristoph Hellwig __u32 minor_hash, 10243dcf5451SChristoph Hellwig struct ext4_dir_entry_2 *dirent); 10253dcf5451SChristoph Hellwig extern void ext4_htree_free_dir_info(struct dir_private_info *p); 10263dcf5451SChristoph Hellwig 10273dcf5451SChristoph Hellwig /* fsync.c */ 10283dcf5451SChristoph Hellwig extern int ext4_sync_file(struct file *, struct dentry *, int); 10293dcf5451SChristoph Hellwig 10303dcf5451SChristoph Hellwig /* hash.c */ 10313dcf5451SChristoph Hellwig extern int ext4fs_dirhash(const char *name, int len, struct 10323dcf5451SChristoph Hellwig dx_hash_info *hinfo); 10333dcf5451SChristoph Hellwig 10343dcf5451SChristoph Hellwig /* ialloc.c */ 10353dcf5451SChristoph Hellwig extern struct inode * ext4_new_inode(handle_t *, struct inode *, int); 10363dcf5451SChristoph Hellwig extern void ext4_free_inode(handle_t *, struct inode *); 10373dcf5451SChristoph Hellwig extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 10383dcf5451SChristoph Hellwig extern unsigned long ext4_count_free_inodes(struct super_block *); 10393dcf5451SChristoph Hellwig extern unsigned long ext4_count_dirs(struct super_block *); 10403dcf5451SChristoph Hellwig extern void ext4_check_inodes_bitmap(struct super_block *); 10413dcf5451SChristoph Hellwig 10423dcf5451SChristoph Hellwig /* mballoc.c */ 10433dcf5451SChristoph Hellwig extern long ext4_mb_stats; 10443dcf5451SChristoph Hellwig extern long ext4_mb_max_to_scan; 10453dcf5451SChristoph Hellwig extern int ext4_mb_init(struct super_block *, int); 10463dcf5451SChristoph Hellwig extern int ext4_mb_release(struct super_block *); 10473dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 10483dcf5451SChristoph Hellwig struct ext4_allocation_request *, int *); 10493dcf5451SChristoph Hellwig extern int ext4_mb_reserve_blocks(struct super_block *, int); 1050c2ea3fdeSTheodore Ts'o extern void ext4_discard_preallocations(struct inode *); 10513dcf5451SChristoph Hellwig extern int __init init_ext4_mballoc(void); 10523dcf5451SChristoph Hellwig extern void exit_ext4_mballoc(void); 10533dcf5451SChristoph Hellwig extern void ext4_mb_free_blocks(handle_t *, struct inode *, 10543dcf5451SChristoph Hellwig unsigned long, unsigned long, int, unsigned long *); 1055920313a7SAneesh Kumar K.V extern int ext4_mb_add_groupinfo(struct super_block *sb, 10565f21b0e6SFrederic Bohe ext4_group_t i, struct ext4_group_desc *desc); 10575f21b0e6SFrederic Bohe extern void ext4_mb_update_group_info(struct ext4_group_info *grp, 10585f21b0e6SFrederic Bohe ext4_grpblk_t add); 1059920313a7SAneesh Kumar K.V extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); 1060920313a7SAneesh Kumar K.V extern void ext4_mb_put_buddy_cache_lock(struct super_block *, 1061920313a7SAneesh Kumar K.V ext4_group_t, int); 10623dcf5451SChristoph Hellwig /* inode.c */ 10633dcf5451SChristoph Hellwig int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, 10643dcf5451SChristoph Hellwig struct buffer_head *bh, ext4_fsblk_t blocknr); 10653dcf5451SChristoph Hellwig struct buffer_head *ext4_getblk(handle_t *, struct inode *, 10663dcf5451SChristoph Hellwig ext4_lblk_t, int, int *); 10673dcf5451SChristoph Hellwig struct buffer_head *ext4_bread(handle_t *, struct inode *, 10683dcf5451SChristoph Hellwig ext4_lblk_t, int, int *); 10696873fa0dSEric Sandeen int ext4_get_block(struct inode *inode, sector_t iblock, 10706873fa0dSEric Sandeen struct buffer_head *bh_result, int create); 10713dcf5451SChristoph Hellwig 10723dcf5451SChristoph Hellwig extern struct inode *ext4_iget(struct super_block *, unsigned long); 10733dcf5451SChristoph Hellwig extern int ext4_write_inode(struct inode *, int); 10743dcf5451SChristoph Hellwig extern int ext4_setattr(struct dentry *, struct iattr *); 10753e3398a0SMingming Cao extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 10763e3398a0SMingming Cao struct kstat *stat); 10773dcf5451SChristoph Hellwig extern void ext4_delete_inode(struct inode *); 10783dcf5451SChristoph Hellwig extern int ext4_sync_inode(handle_t *, struct inode *); 10793dcf5451SChristoph Hellwig extern void ext4_dirty_inode(struct inode *); 10803dcf5451SChristoph Hellwig extern int ext4_change_inode_journal_flag(struct inode *, int); 10813dcf5451SChristoph Hellwig extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 108291ef4cafSDuane Griffin extern int ext4_can_truncate(struct inode *inode); 10833dcf5451SChristoph Hellwig extern void ext4_truncate(struct inode *); 10843dcf5451SChristoph Hellwig extern void ext4_set_inode_flags(struct inode *); 10853dcf5451SChristoph Hellwig extern void ext4_get_inode_flags(struct ext4_inode_info *); 1086ccd2506bSTheodore Ts'o extern int ext4_alloc_da_blocks(struct inode *inode); 10873dcf5451SChristoph Hellwig extern void ext4_set_aops(struct inode *inode); 10883dcf5451SChristoph Hellwig extern int ext4_writepage_trans_blocks(struct inode *); 1089a02908f1SMingming Cao extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); 1090f3bd1f3fSMingming Cao extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 1091cf108bcaSJan Kara extern int ext4_block_truncate_page(handle_t *handle, 10923dcf5451SChristoph Hellwig struct address_space *mapping, loff_t from); 1093c2ec175cSNick Piggin extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 109460e58e0fSMingming Cao extern qsize_t ext4_get_reserved_space(struct inode *inode); 10953dcf5451SChristoph Hellwig 10963dcf5451SChristoph Hellwig /* ioctl.c */ 10973dcf5451SChristoph Hellwig extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 10983dcf5451SChristoph Hellwig extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 10993dcf5451SChristoph Hellwig 11003dcf5451SChristoph Hellwig /* migrate.c */ 11012a43a878SAneesh Kumar K.V extern int ext4_ext_migrate(struct inode *); 11023d0518f4SWei Yongjun 11033dcf5451SChristoph Hellwig /* namei.c */ 11043d0518f4SWei Yongjun extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize); 11053d0518f4SWei Yongjun extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize); 11063dcf5451SChristoph Hellwig extern int ext4_orphan_add(handle_t *, struct inode *); 11073dcf5451SChristoph Hellwig extern int ext4_orphan_del(handle_t *, struct inode *); 11083dcf5451SChristoph Hellwig extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 11093dcf5451SChristoph Hellwig __u32 start_minor_hash, __u32 *next_hash); 11103dcf5451SChristoph Hellwig 11113dcf5451SChristoph Hellwig /* resize.c */ 11123dcf5451SChristoph Hellwig extern int ext4_group_add(struct super_block *sb, 11133dcf5451SChristoph Hellwig struct ext4_new_group_data *input); 11143dcf5451SChristoph Hellwig extern int ext4_group_extend(struct super_block *sb, 11153dcf5451SChristoph Hellwig struct ext4_super_block *es, 11163dcf5451SChristoph Hellwig ext4_fsblk_t n_blocks_count); 11173dcf5451SChristoph Hellwig 11183dcf5451SChristoph Hellwig /* super.c */ 11193dcf5451SChristoph Hellwig extern void ext4_error(struct super_block *, const char *, const char *, ...) 11203dcf5451SChristoph Hellwig __attribute__ ((format (printf, 3, 4))); 11213dcf5451SChristoph Hellwig extern void __ext4_std_error(struct super_block *, const char *, int); 11223dcf5451SChristoph Hellwig extern void ext4_abort(struct super_block *, const char *, const char *, ...) 11233dcf5451SChristoph Hellwig __attribute__ ((format (printf, 3, 4))); 11243dcf5451SChristoph Hellwig extern void ext4_warning(struct super_block *, const char *, const char *, ...) 11253dcf5451SChristoph Hellwig __attribute__ ((format (printf, 3, 4))); 11265d1b1b3fSAneesh Kumar K.V extern void ext4_grp_locked_error(struct super_block *, ext4_group_t, 11275d1b1b3fSAneesh Kumar K.V const char *, const char *, ...) 11285d1b1b3fSAneesh Kumar K.V __attribute__ ((format (printf, 4, 5))); 11293dcf5451SChristoph Hellwig extern void ext4_update_dynamic_rev(struct super_block *sb); 11303dcf5451SChristoph Hellwig extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 11313dcf5451SChristoph Hellwig __u32 compat); 11323dcf5451SChristoph Hellwig extern int ext4_update_rocompat_feature(handle_t *handle, 11333dcf5451SChristoph Hellwig struct super_block *sb, __u32 rocompat); 11343dcf5451SChristoph Hellwig extern int ext4_update_incompat_feature(handle_t *handle, 11353dcf5451SChristoph Hellwig struct super_block *sb, __u32 incompat); 11363dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 11373dcf5451SChristoph Hellwig struct ext4_group_desc *bg); 11383dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 11393dcf5451SChristoph Hellwig struct ext4_group_desc *bg); 11403dcf5451SChristoph Hellwig extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 11413dcf5451SChristoph Hellwig struct ext4_group_desc *bg); 1142560671a0SAneesh Kumar K.V extern __u32 ext4_free_blks_count(struct super_block *sb, 1143560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 1144560671a0SAneesh Kumar K.V extern __u32 ext4_free_inodes_count(struct super_block *sb, 1145560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 1146560671a0SAneesh Kumar K.V extern __u32 ext4_used_dirs_count(struct super_block *sb, 1147560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 1148560671a0SAneesh Kumar K.V extern __u32 ext4_itable_unused_count(struct super_block *sb, 1149560671a0SAneesh Kumar K.V struct ext4_group_desc *bg); 11503dcf5451SChristoph Hellwig extern void ext4_block_bitmap_set(struct super_block *sb, 11513dcf5451SChristoph Hellwig struct ext4_group_desc *bg, ext4_fsblk_t blk); 11523dcf5451SChristoph Hellwig extern void ext4_inode_bitmap_set(struct super_block *sb, 11533dcf5451SChristoph Hellwig struct ext4_group_desc *bg, ext4_fsblk_t blk); 11543dcf5451SChristoph Hellwig extern void ext4_inode_table_set(struct super_block *sb, 11553dcf5451SChristoph Hellwig struct ext4_group_desc *bg, ext4_fsblk_t blk); 1156560671a0SAneesh Kumar K.V extern void ext4_free_blks_set(struct super_block *sb, 1157560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count); 1158560671a0SAneesh Kumar K.V extern void ext4_free_inodes_set(struct super_block *sb, 1159560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count); 1160560671a0SAneesh Kumar K.V extern void ext4_used_dirs_set(struct super_block *sb, 1161560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count); 1162560671a0SAneesh Kumar K.V extern void ext4_itable_unused_set(struct super_block *sb, 1163560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count); 11643dcf5451SChristoph Hellwig 11653dcf5451SChristoph Hellwig static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 11663dcf5451SChristoph Hellwig { 11673dcf5451SChristoph Hellwig return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 11683dcf5451SChristoph Hellwig le32_to_cpu(es->s_blocks_count_lo); 11693dcf5451SChristoph Hellwig } 11703dcf5451SChristoph Hellwig 11713dcf5451SChristoph Hellwig static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 11723dcf5451SChristoph Hellwig { 11733dcf5451SChristoph Hellwig return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 11743dcf5451SChristoph Hellwig le32_to_cpu(es->s_r_blocks_count_lo); 11753dcf5451SChristoph Hellwig } 11763dcf5451SChristoph Hellwig 11773dcf5451SChristoph Hellwig static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 11783dcf5451SChristoph Hellwig { 11793dcf5451SChristoph Hellwig return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 11803dcf5451SChristoph Hellwig le32_to_cpu(es->s_free_blocks_count_lo); 11813dcf5451SChristoph Hellwig } 11823dcf5451SChristoph Hellwig 11833dcf5451SChristoph Hellwig static inline void ext4_blocks_count_set(struct ext4_super_block *es, 11843dcf5451SChristoph Hellwig ext4_fsblk_t blk) 11853dcf5451SChristoph Hellwig { 11863dcf5451SChristoph Hellwig es->s_blocks_count_lo = cpu_to_le32((u32)blk); 11873dcf5451SChristoph Hellwig es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 11883dcf5451SChristoph Hellwig } 11893dcf5451SChristoph Hellwig 11903dcf5451SChristoph Hellwig static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 11913dcf5451SChristoph Hellwig ext4_fsblk_t blk) 11923dcf5451SChristoph Hellwig { 11933dcf5451SChristoph Hellwig es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 11943dcf5451SChristoph Hellwig es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 11953dcf5451SChristoph Hellwig } 11963dcf5451SChristoph Hellwig 11973dcf5451SChristoph Hellwig static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 11983dcf5451SChristoph Hellwig ext4_fsblk_t blk) 11993dcf5451SChristoph Hellwig { 12003dcf5451SChristoph Hellwig es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 12013dcf5451SChristoph Hellwig es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 12023dcf5451SChristoph Hellwig } 12033dcf5451SChristoph Hellwig 12043dcf5451SChristoph Hellwig static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 12053dcf5451SChristoph Hellwig { 120606a279d6STheodore Ts'o if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 12073dcf5451SChristoph Hellwig return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 12083dcf5451SChristoph Hellwig le32_to_cpu(raw_inode->i_size_lo); 120906a279d6STheodore Ts'o else 121006a279d6STheodore Ts'o return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 12113dcf5451SChristoph Hellwig } 12123dcf5451SChristoph Hellwig 12133dcf5451SChristoph Hellwig static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 12143dcf5451SChristoph Hellwig { 12153dcf5451SChristoph Hellwig raw_inode->i_size_lo = cpu_to_le32(i_size); 12163dcf5451SChristoph Hellwig raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 12173dcf5451SChristoph Hellwig } 12183dcf5451SChristoph Hellwig 12193dcf5451SChristoph Hellwig static inline 12203dcf5451SChristoph Hellwig struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 12213dcf5451SChristoph Hellwig ext4_group_t group) 12223dcf5451SChristoph Hellwig { 12233dcf5451SChristoph Hellwig struct ext4_group_info ***grp_info; 12243dcf5451SChristoph Hellwig long indexv, indexh; 12253dcf5451SChristoph Hellwig grp_info = EXT4_SB(sb)->s_group_info; 12263dcf5451SChristoph Hellwig indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 12273dcf5451SChristoph Hellwig indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 12283dcf5451SChristoph Hellwig return grp_info[indexv][indexh]; 12293dcf5451SChristoph Hellwig } 12303dcf5451SChristoph Hellwig 12318df9675fSTheodore Ts'o /* 12328df9675fSTheodore Ts'o * Reading s_groups_count requires using smp_rmb() afterwards. See 12338df9675fSTheodore Ts'o * the locking protocol documented in the comments of ext4_group_add() 12348df9675fSTheodore Ts'o * in resize.c 12358df9675fSTheodore Ts'o */ 12368df9675fSTheodore Ts'o static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 12378df9675fSTheodore Ts'o { 12388df9675fSTheodore Ts'o ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 12398df9675fSTheodore Ts'o 12408df9675fSTheodore Ts'o smp_rmb(); 12418df9675fSTheodore Ts'o return ngroups; 12428df9675fSTheodore Ts'o } 12433dcf5451SChristoph Hellwig 1244772cb7c8SJose R. Santos static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 1245772cb7c8SJose R. Santos ext4_group_t block_group) 1246772cb7c8SJose R. Santos { 1247772cb7c8SJose R. Santos return block_group >> sbi->s_log_groups_per_flex; 1248772cb7c8SJose R. Santos } 1249772cb7c8SJose R. Santos 1250772cb7c8SJose R. Santos static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 1251772cb7c8SJose R. Santos { 1252772cb7c8SJose R. Santos return 1 << sbi->s_log_groups_per_flex; 1253772cb7c8SJose R. Santos } 1254772cb7c8SJose R. Santos 12553dcf5451SChristoph Hellwig #define ext4_std_error(sb, errno) \ 12563dcf5451SChristoph Hellwig do { \ 12573dcf5451SChristoph Hellwig if ((errno)) \ 12584db9c54aSStoyan Gaydarov __ext4_std_error((sb), __func__, (errno)); \ 12593dcf5451SChristoph Hellwig } while (0) 12603dcf5451SChristoph Hellwig 1261a30d542aSAneesh Kumar K.V #ifdef CONFIG_SMP 1262179f7ebfSEric Dumazet /* Each CPU can accumulate percpu_counter_batch blocks in their local 1263a30d542aSAneesh Kumar K.V * counters. So we need to make sure we have free blocks more 1264179f7ebfSEric Dumazet * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 1265a30d542aSAneesh Kumar K.V */ 1266179f7ebfSEric Dumazet #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 1267a30d542aSAneesh Kumar K.V #else 1268a30d542aSAneesh Kumar K.V #define EXT4_FREEBLOCKS_WATERMARK 0 1269a30d542aSAneesh Kumar K.V #endif 1270a30d542aSAneesh Kumar K.V 1271cf17fea6SAneesh Kumar K.V static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 1272cf17fea6SAneesh Kumar K.V { 1273cf17fea6SAneesh Kumar K.V /* 1274cf17fea6SAneesh Kumar K.V * XXX: replace with spinlock if seen contended -bzzz 1275cf17fea6SAneesh Kumar K.V */ 1276cf17fea6SAneesh Kumar K.V down_write(&EXT4_I(inode)->i_data_sem); 1277cf17fea6SAneesh Kumar K.V if (newsize > EXT4_I(inode)->i_disksize) 1278cf17fea6SAneesh Kumar K.V EXT4_I(inode)->i_disksize = newsize; 1279cf17fea6SAneesh Kumar K.V up_write(&EXT4_I(inode)->i_data_sem); 1280cf17fea6SAneesh Kumar K.V return ; 1281cf17fea6SAneesh Kumar K.V } 1282a30d542aSAneesh Kumar K.V 12835d1b1b3fSAneesh Kumar K.V struct ext4_group_info { 12845d1b1b3fSAneesh Kumar K.V unsigned long bb_state; 12855d1b1b3fSAneesh Kumar K.V struct rb_root bb_free_root; 12865d1b1b3fSAneesh Kumar K.V unsigned short bb_first_free; 12875d1b1b3fSAneesh Kumar K.V unsigned short bb_free; 12885d1b1b3fSAneesh Kumar K.V unsigned short bb_fragments; 12895d1b1b3fSAneesh Kumar K.V struct list_head bb_prealloc_list; 12905d1b1b3fSAneesh Kumar K.V #ifdef DOUBLE_CHECK 12915d1b1b3fSAneesh Kumar K.V void *bb_bitmap; 12925d1b1b3fSAneesh Kumar K.V #endif 12935d1b1b3fSAneesh Kumar K.V struct rw_semaphore alloc_sem; 12945d1b1b3fSAneesh Kumar K.V unsigned short bb_counters[]; 12955d1b1b3fSAneesh Kumar K.V }; 12965d1b1b3fSAneesh Kumar K.V 12975d1b1b3fSAneesh Kumar K.V #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 12985d1b1b3fSAneesh Kumar K.V #define EXT4_GROUP_INFO_LOCKED_BIT 1 12995d1b1b3fSAneesh Kumar K.V 13005d1b1b3fSAneesh Kumar K.V #define EXT4_MB_GRP_NEED_INIT(grp) \ 13015d1b1b3fSAneesh Kumar K.V (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 13025d1b1b3fSAneesh Kumar K.V 13035d1b1b3fSAneesh Kumar K.V static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 13045d1b1b3fSAneesh Kumar K.V { 13055d1b1b3fSAneesh Kumar K.V struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); 13065d1b1b3fSAneesh Kumar K.V 13075d1b1b3fSAneesh Kumar K.V bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state)); 13085d1b1b3fSAneesh Kumar K.V } 13095d1b1b3fSAneesh Kumar K.V 13105d1b1b3fSAneesh Kumar K.V static inline void ext4_unlock_group(struct super_block *sb, 13115d1b1b3fSAneesh Kumar K.V ext4_group_t group) 13125d1b1b3fSAneesh Kumar K.V { 13135d1b1b3fSAneesh Kumar K.V struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); 13145d1b1b3fSAneesh Kumar K.V 13155d1b1b3fSAneesh Kumar K.V bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state)); 13165d1b1b3fSAneesh Kumar K.V } 13175d1b1b3fSAneesh Kumar K.V 13185d1b1b3fSAneesh Kumar K.V static inline int ext4_is_group_locked(struct super_block *sb, 13195d1b1b3fSAneesh Kumar K.V ext4_group_t group) 13205d1b1b3fSAneesh Kumar K.V { 13215d1b1b3fSAneesh Kumar K.V struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); 13225d1b1b3fSAneesh Kumar K.V 13235d1b1b3fSAneesh Kumar K.V return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT, 13245d1b1b3fSAneesh Kumar K.V &(grinfo->bb_state)); 13255d1b1b3fSAneesh Kumar K.V } 13265d1b1b3fSAneesh Kumar K.V 13273dcf5451SChristoph Hellwig /* 13283dcf5451SChristoph Hellwig * Inodes and files operations 13293dcf5451SChristoph Hellwig */ 13303dcf5451SChristoph Hellwig 13313dcf5451SChristoph Hellwig /* dir.c */ 13323dcf5451SChristoph Hellwig extern const struct file_operations ext4_dir_operations; 13333dcf5451SChristoph Hellwig 13343dcf5451SChristoph Hellwig /* file.c */ 13353dcf5451SChristoph Hellwig extern const struct inode_operations ext4_file_inode_operations; 13363dcf5451SChristoph Hellwig extern const struct file_operations ext4_file_operations; 13373dcf5451SChristoph Hellwig 13383dcf5451SChristoph Hellwig /* namei.c */ 13393dcf5451SChristoph Hellwig extern const struct inode_operations ext4_dir_inode_operations; 13403dcf5451SChristoph Hellwig extern const struct inode_operations ext4_special_inode_operations; 13413dcf5451SChristoph Hellwig 13423dcf5451SChristoph Hellwig /* symlink.c */ 13433dcf5451SChristoph Hellwig extern const struct inode_operations ext4_symlink_inode_operations; 13443dcf5451SChristoph Hellwig extern const struct inode_operations ext4_fast_symlink_inode_operations; 13453dcf5451SChristoph Hellwig 13463dcf5451SChristoph Hellwig /* extents.c */ 13473dcf5451SChristoph Hellwig extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 13483dcf5451SChristoph Hellwig extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 1349a02908f1SMingming Cao extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 1350a02908f1SMingming Cao int chunk); 13513dcf5451SChristoph Hellwig extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, 1352498e5f24STheodore Ts'o ext4_lblk_t iblock, unsigned int max_blocks, 1353498e5f24STheodore Ts'o struct buffer_head *bh_result, 13543dcf5451SChristoph Hellwig int create, int extend_disksize); 1355cf108bcaSJan Kara extern void ext4_ext_truncate(struct inode *); 13563dcf5451SChristoph Hellwig extern void ext4_ext_init(struct super_block *); 13573dcf5451SChristoph Hellwig extern void ext4_ext_release(struct super_block *); 13583dcf5451SChristoph Hellwig extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, 13593dcf5451SChristoph Hellwig loff_t len); 13603dcf5451SChristoph Hellwig extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, 1361498e5f24STheodore Ts'o sector_t block, unsigned int max_blocks, 13623dcf5451SChristoph Hellwig struct buffer_head *bh, int create, 1363d2a17637SMingming Cao int extend_disksize, int flag); 13643a06d778SAneesh Kumar K.V extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 13653a06d778SAneesh Kumar K.V __u64 start, __u64 len); 13663a06d778SAneesh Kumar K.V 13672ccb5fb9SAneesh Kumar K.V /* 13682ccb5fb9SAneesh Kumar K.V * Add new method to test wether block and inode bitmaps are properly 13692ccb5fb9SAneesh Kumar K.V * initialized. With uninit_bg reading the block from disk is not enough 13702ccb5fb9SAneesh Kumar K.V * to mark the bitmap uptodate. We need to also zero-out the bitmap 13712ccb5fb9SAneesh Kumar K.V */ 13722ccb5fb9SAneesh Kumar K.V #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 13732ccb5fb9SAneesh Kumar K.V 13742ccb5fb9SAneesh Kumar K.V static inline int bitmap_uptodate(struct buffer_head *bh) 13752ccb5fb9SAneesh Kumar K.V { 13762ccb5fb9SAneesh Kumar K.V return (buffer_uptodate(bh) && 13772ccb5fb9SAneesh Kumar K.V test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 13782ccb5fb9SAneesh Kumar K.V } 13792ccb5fb9SAneesh Kumar K.V static inline void set_bitmap_uptodate(struct buffer_head *bh) 13802ccb5fb9SAneesh Kumar K.V { 13812ccb5fb9SAneesh Kumar K.V set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 13822ccb5fb9SAneesh Kumar K.V } 13832ccb5fb9SAneesh Kumar K.V 13843dcf5451SChristoph Hellwig #endif /* __KERNEL__ */ 13853dcf5451SChristoph Hellwig 13863dcf5451SChristoph Hellwig #endif /* _EXT4_H */ 1387