| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * ext4.h |
| * |
| * Copyright (C) 1992, 1993, 1994, 1995 |
| * Remy Card (card@masi.ibp.fr) |
| * Laboratoire MASI - Institut Blaise Pascal |
| * Universite Pierre et Marie Curie (Paris VI) |
| * |
| * from |
| * |
| * linux/include/linux/minix_fs.h |
| * |
| * Copyright (C) 1991, 1992 Linus Torvalds |
| */ |
| |
| #ifndef _EXT4_H |
| #define _EXT4_H |
| |
| #include <linux/refcount.h> |
| #include <linux/types.h> |
| #include <linux/blkdev.h> |
| #include <linux/magic.h> |
| #include <linux/jbd2.h> |
| #include <linux/quota.h> |
| #include <linux/rwsem.h> |
| #include <linux/rbtree.h> |
| #include <linux/seqlock.h> |
| #include <linux/mutex.h> |
| #include <linux/timer.h> |
| #include <linux/wait.h> |
| #include <linux/sched/signal.h> |
| #include <linux/blockgroup_lock.h> |
| #include <linux/percpu_counter.h> |
| #include <linux/ratelimit.h> |
| #include <crypto/hash.h> |
| #include <linux/falloc.h> |
| #include <linux/percpu-rwsem.h> |
| #include <linux/fiemap.h> |
| #ifdef __KERNEL__ |
| #include <linux/compat.h> |
| #endif |
| |
| #include <linux/fscrypt.h> |
| #include <linux/fsverity.h> |
| |
| #include <linux/compiler.h> |
| |
| /* |
| * The fourth extended filesystem constants/structures |
| */ |
| |
| /* |
| * with AGGRESSIVE_CHECK allocator runs consistency checks over |
| * structures. these checks slow things down a lot |
| */ |
| #define AGGRESSIVE_CHECK__ |
| |
| /* |
| * with DOUBLE_CHECK defined mballoc creates persistent in-core |
| * bitmaps, maintains and uses them to check for double allocations |
| */ |
| #define DOUBLE_CHECK__ |
| |
| /* |
| * Define EXT4FS_DEBUG to produce debug messages |
| */ |
| #undef EXT4FS_DEBUG |
| |
| /* |
| * Debug code |
| */ |
| #ifdef EXT4FS_DEBUG |
| #define ext4_debug(f, a...) \ |
| do { \ |
| printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ |
| __FILE__, __LINE__, __func__); \ |
| printk(KERN_DEBUG f, ## a); \ |
| } while (0) |
| #else |
| #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
| #endif |
| |
| /* |
| * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c |
| */ |
| #define EXT_DEBUG__ |
| |
| /* |
| * Dynamic printk for controlled extents debugging. |
| */ |
| #ifdef CONFIG_EXT4_DEBUG |
| #define ext_debug(ino, fmt, ...) \ |
| pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \ |
| current->comm, task_pid_nr(current), \ |
| ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \ |
| __func__, ##__VA_ARGS__) |
| #else |
| #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
| #endif |
| |
| #define ASSERT(assert) \ |
| do { \ |
| if (unlikely(!(assert))) { \ |
| printk(KERN_EMERG \ |
| "Assertion failure in %s() at %s:%d: '%s'\n", \ |
| __func__, __FILE__, __LINE__, #assert); \ |
| BUG(); \ |
| } \ |
| } while (0) |
| |
| /* data type for block offset of block group */ |
| typedef int ext4_grpblk_t; |
| |
| /* data type for filesystem-wide blocks number */ |
| typedef unsigned long long ext4_fsblk_t; |
| |
| /* data type for file logical block number */ |
| typedef __u32 ext4_lblk_t; |
| |
| /* data type for block group number */ |
| typedef unsigned int ext4_group_t; |
| |
| enum SHIFT_DIRECTION { |
| SHIFT_LEFT = 0, |
| SHIFT_RIGHT, |
| }; |
| |
| /* |
| * Flags used in mballoc's allocation_context flags field. |
| * |
| * Also used to show what's going on for debugging purposes when the |
| * flag field is exported via the traceport interface |
| */ |
| |
| /* prefer goal again. length */ |
| #define EXT4_MB_HINT_MERGE 0x0001 |
| /* blocks already reserved */ |
| #define EXT4_MB_HINT_RESERVED 0x0002 |
| /* metadata is being allocated */ |
| #define EXT4_MB_HINT_METADATA 0x0004 |
| /* first blocks in the file */ |
| #define EXT4_MB_HINT_FIRST 0x0008 |
| /* search for the best chunk */ |
| #define EXT4_MB_HINT_BEST 0x0010 |
| /* data is being allocated */ |
| #define EXT4_MB_HINT_DATA 0x0020 |
| /* don't preallocate (for tails) */ |
| #define EXT4_MB_HINT_NOPREALLOC 0x0040 |
| /* allocate for locality group */ |
| #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 |
| /* allocate goal blocks or none */ |
| #define EXT4_MB_HINT_GOAL_ONLY 0x0100 |
| /* goal is meaningful */ |
| #define EXT4_MB_HINT_TRY_GOAL 0x0200 |
| /* blocks already pre-reserved by delayed allocation */ |
| #define EXT4_MB_DELALLOC_RESERVED 0x0400 |
| /* We are doing stream allocation */ |
| #define EXT4_MB_STREAM_ALLOC 0x0800 |
| /* Use reserved root blocks if needed */ |
| #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 |
| /* Use blocks from reserved pool */ |
| #define EXT4_MB_USE_RESERVED 0x2000 |
| /* Do strict check for free blocks while retrying block allocation */ |
| #define EXT4_MB_STRICT_CHECK 0x4000 |
| /* Large fragment size list lookup succeeded at least once for cr = 0 */ |
| #define EXT4_MB_CR0_OPTIMIZED 0x8000 |
| /* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */ |
| #define EXT4_MB_CR1_OPTIMIZED 0x00010000 |
| struct ext4_allocation_request { |
| /* target inode for block we're allocating */ |
| struct inode *inode; |
| /* how many blocks we want to allocate */ |
| unsigned int len; |
| /* logical block in target inode */ |
| ext4_lblk_t logical; |
| /* the closest logical allocated block to the left */ |
| ext4_lblk_t lleft; |
| /* the closest logical allocated block to the right */ |
| ext4_lblk_t lright; |
| /* phys. target (a hint) */ |
| ext4_fsblk_t goal; |
| /* phys. block for the closest logical allocated block to the left */ |
| ext4_fsblk_t pleft; |
| /* phys. block for the closest logical allocated block to the right */ |
| ext4_fsblk_t pright; |
| /* flags. see above EXT4_MB_HINT_* */ |
| unsigned int flags; |
| }; |
| |
| /* |
| * Logical to physical block mapping, used by ext4_map_blocks() |
| * |
| * This structure is used to pass requests into ext4_map_blocks() as |
| * well as to store the information returned by ext4_map_blocks(). It |
| * takes less room on the stack than a struct buffer_head. |
| */ |
| #define EXT4_MAP_NEW BIT(BH_New) |
| #define EXT4_MAP_MAPPED BIT(BH_Mapped) |
| #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) |
| #define EXT4_MAP_BOUNDARY BIT(BH_Boundary) |
| #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ |
| EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) |
| |
| struct ext4_map_blocks { |
| ext4_fsblk_t m_pblk; |
| ext4_lblk_t m_lblk; |
| unsigned int m_len; |
| unsigned int m_flags; |
| }; |
| |
| /* |
| * Block validity checking, system zone rbtree. |
| */ |
| struct ext4_system_blocks { |
| struct rb_root root; |
| struct rcu_head rcu; |
| }; |
| |
| /* |
| * Flags for ext4_io_end->flags |
| */ |
| #define EXT4_IO_END_UNWRITTEN 0x0001 |
| |
| struct ext4_io_end_vec { |
| struct list_head list; /* list of io_end_vec */ |
| loff_t offset; /* offset in the file */ |
| ssize_t size; /* size of the extent */ |
| }; |
| |
| /* |
| * For converting unwritten extents on a work queue. 'handle' is used for |
| * buffered writeback. |
| */ |
| typedef struct ext4_io_end { |
| struct list_head list; /* per-file finished IO list */ |
| handle_t *handle; /* handle reserved for extent |
| * conversion */ |
| struct inode *inode; /* file being written to */ |
| struct bio *bio; /* Linked list of completed |
| * bios covering the extent */ |
| unsigned int flag; /* unwritten or not */ |
| refcount_t count; /* reference counter */ |
| struct list_head list_vec; /* list of ext4_io_end_vec */ |
| } ext4_io_end_t; |
| |
| struct ext4_io_submit { |
| struct writeback_control *io_wbc; |
| struct bio *io_bio; |
| ext4_io_end_t *io_end; |
| sector_t io_next_block; |
| }; |
| |
| /* |
| * Special inodes numbers |
| */ |
| #define EXT4_BAD_INO 1 /* Bad blocks inode */ |
| #define EXT4_ROOT_INO 2 /* Root inode */ |
| #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ |
| #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ |
| #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ |
| #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ |
| #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ |
| #define EXT4_JOURNAL_INO 8 /* Journal inode */ |
| |
| /* First non-reserved inode for old ext4 filesystems */ |
| #define EXT4_GOOD_OLD_FIRST_INO 11 |
| |
| /* |
| * Maximal count of links to a file |
| */ |
| #define EXT4_LINK_MAX 65000 |
| |
| /* |
| * Macro-instructions used to manage several block sizes |
| */ |
| #define EXT4_MIN_BLOCK_SIZE 1024 |
| #define EXT4_MAX_BLOCK_SIZE 65536 |
| #define EXT4_MIN_BLOCK_LOG_SIZE 10 |
| #define EXT4_MAX_BLOCK_LOG_SIZE 16 |
| #define EXT4_MAX_CLUSTER_LOG_SIZE 30 |
| #ifdef __KERNEL__ |
| # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) |
| #else |
| # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) |
| #endif |
| #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) |
| #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ |
| EXT4_SB(s)->s_cluster_bits) |
| #ifdef __KERNEL__ |
| # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) |
| # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) |
| #else |
| # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) |
| #endif |
| #ifdef __KERNEL__ |
| #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) |
| #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) |
| #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) |
| #else |
| #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
| EXT4_GOOD_OLD_INODE_SIZE : \ |
| (s)->s_inode_size) |
| #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
| EXT4_GOOD_OLD_FIRST_INO : \ |
| (s)->s_first_ino) |
| #endif |
| #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) |
| #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ |
| ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ |
| blkbits)) |
| |
| /* Translate a block number to a cluster number */ |
| #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) |
| /* Translate a cluster number to a block number */ |
| #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) |
| /* Translate # of blks to # of clusters */ |
| #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ |
| (sbi)->s_cluster_bits) |
| /* Mask out the low bits to get the starting block of the cluster */ |
| #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ |
| ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) |
| #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ |
| ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) |
| /* Fill in the low bits to get the last block of the cluster */ |
| #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ |
| ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) |
| /* Get the cluster offset */ |
| #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ |
| ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) |
| #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ |
| ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) |
| |
| /* |
| * Structure of a blocks group descriptor |
| */ |
| struct ext4_group_desc |
| { |
| __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ |
| __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ |
| __le32 bg_inode_table_lo; /* Inodes table block */ |
| __le16 bg_free_blocks_count_lo;/* Free blocks count */ |
| __le16 bg_free_inodes_count_lo;/* Free inodes count */ |
| __le16 bg_used_dirs_count_lo; /* Directories count */ |
| __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ |
| __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ |
| __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ |
| __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ |
| __le16 bg_itable_unused_lo; /* Unused inodes count */ |
| __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ |
| __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ |
| __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ |
| __le32 bg_inode_table_hi; /* Inodes table block MSB */ |
| __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ |
| __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ |
| __le16 bg_used_dirs_count_hi; /* Directories count MSB */ |
| __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ |
| __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ |
| __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ |
| __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ |
| __u32 bg_reserved; |
| }; |
| |
| #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ |
| (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ |
| sizeof(__le16)) |
| #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ |
| (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ |
| sizeof(__le16)) |
| |
| /* |
| * Structure of a flex block group info |
| */ |
| |
| struct flex_groups { |
| atomic64_t free_clusters; |
| atomic_t free_inodes; |
| atomic_t used_dirs; |
| }; |
| |
| #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ |
| #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ |
| #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ |
| |
| /* |
| * Macro-instructions used to manage group descriptors |
| */ |
| #define EXT4_MIN_DESC_SIZE 32 |
| #define EXT4_MIN_DESC_SIZE_64BIT 64 |
| #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE |
| #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) |
| #ifdef __KERNEL__ |
| # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) |
| # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) |
| # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) |
| # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) |
| # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) |
| #else |
| # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) |
| # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) |
| # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) |
| #endif |
| |
| /* |
| * Constants relative to the data blocks |
| */ |
| #define EXT4_NDIR_BLOCKS 12 |
| #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS |
| #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) |
| #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) |
| #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) |
| |
| /* |
| * Inode flags |
| */ |
| #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ |
| #define EXT4_UNRM_FL 0x00000002 /* Undelete */ |
| #define EXT4_COMPR_FL 0x00000004 /* Compress file */ |
| #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ |
| #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ |
| #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ |
| #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ |
| #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ |
| /* Reserved for compression usage... */ |
| #define EXT4_DIRTY_FL 0x00000100 |
| #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ |
| #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ |
| /* nb: was previously EXT2_ECOMPR_FL */ |
| #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ |
| /* End compression flags --- maybe not all used */ |
| #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ |
| #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ |
| #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ |
| #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ |
| #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ |
| #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ |
| #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ |
| #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ |
| #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ |
| #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ |
| /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ |
| |
| #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */ |
| |
| #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ |
| #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ |
| #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ |
| #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ |
| |
| /* User modifiable flags */ |
| #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \ |
| EXT4_UNRM_FL | \ |
| EXT4_COMPR_FL | \ |
| EXT4_SYNC_FL | \ |
| EXT4_IMMUTABLE_FL | \ |
| EXT4_APPEND_FL | \ |
| EXT4_NODUMP_FL | \ |
| EXT4_NOATIME_FL | \ |
| EXT4_JOURNAL_DATA_FL | \ |
| EXT4_NOTAIL_FL | \ |
| EXT4_DIRSYNC_FL | \ |
| EXT4_TOPDIR_FL | \ |
| EXT4_EXTENTS_FL | \ |
| 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \ |
| EXT4_DAX_FL | \ |
| EXT4_PROJINHERIT_FL | \ |
| EXT4_CASEFOLD_FL) |
| |
| /* User visible flags */ |
| #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \ |
| EXT4_DIRTY_FL | \ |
| EXT4_COMPRBLK_FL | \ |
| EXT4_NOCOMPR_FL | \ |
| EXT4_ENCRYPT_FL | \ |
| EXT4_INDEX_FL | \ |
| EXT4_VERITY_FL | \ |
| EXT4_INLINE_DATA_FL) |
| |
| /* Flags that should be inherited by new inodes from their parent. */ |
| #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ |
| EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ |
| EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ |
| EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ |
| EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\ |
| EXT4_DAX_FL) |
| |
| /* Flags that are appropriate for regular files (all but dir-specific ones). */ |
| #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ |
| EXT4_PROJINHERIT_FL)) |
| |
| /* Flags that are appropriate for non-directories/regular files. */ |
| #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) |
| |
| /* The only flags that should be swapped */ |
| #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) |
| |
| /* Flags which are mutually exclusive to DAX */ |
| #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\ |
| EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL) |
| |
| /* Mask out flags that are inappropriate for the given type of inode. */ |
| static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) |
| { |
| if (S_ISDIR(mode)) |
| return flags; |
| else if (S_ISREG(mode)) |
| return flags & EXT4_REG_FLMASK; |
| else |
| return flags & EXT4_OTHER_FLMASK; |
| } |
| |
| /* |
| * Inode flags used for atomic set/get |
| */ |
| enum { |
| EXT4_INODE_SECRM = 0, /* Secure deletion */ |
| EXT4_INODE_UNRM = 1, /* Undelete */ |
| EXT4_INODE_COMPR = 2, /* Compress file */ |
| EXT4_INODE_SYNC = 3, /* Synchronous updates */ |
| EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ |
| EXT4_INODE_APPEND = 5, /* writes to file may only append */ |
| EXT4_INODE_NODUMP = 6, /* do not dump file */ |
| EXT4_INODE_NOATIME = 7, /* do not update atime */ |
| /* Reserved for compression usage... */ |
| EXT4_INODE_DIRTY = 8, |
| EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ |
| EXT4_INODE_NOCOMPR = 10, /* Don't compress */ |
| EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ |
| /* End compression flags --- maybe not all used */ |
| EXT4_INODE_INDEX = 12, /* hash-indexed directory */ |
| EXT4_INODE_IMAGIC = 13, /* AFS directory */ |
| EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ |
| EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ |
| EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ |
| EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ |
| EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ |
| EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ |
| EXT4_INODE_VERITY = 20, /* Verity protected inode */ |
| EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ |
| /* 22 was formerly EXT4_INODE_EOFBLOCKS */ |
| EXT4_INODE_DAX = 25, /* Inode is DAX */ |
| EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ |
| EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ |
| EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ |
| EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ |
| }; |
| |
| /* |
| * Since it's pretty easy to mix up bit numbers and hex values, we use a |
| * build-time check to make sure that EXT4_XXX_FL is consistent with respect to |
| * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost |
| * any extra space in the compiled kernel image, otherwise, the build will fail. |
| * It's important that these values are the same, since we are using |
| * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent |
| * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk |
| * values found in ext2, ext3 and ext4 filesystems, and of course the values |
| * defined in e2fsprogs. |
| * |
| * It's not paranoia if the Murphy's Law really *is* out to get you. :-) |
| */ |
| #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) |
| #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) |
| |
| static inline void ext4_check_flag_values(void) |
| { |
| CHECK_FLAG_VALUE(SECRM); |
| CHECK_FLAG_VALUE(UNRM); |
| CHECK_FLAG_VALUE(COMPR); |
| CHECK_FLAG_VALUE(SYNC); |
| CHECK_FLAG_VALUE(IMMUTABLE); |
| CHECK_FLAG_VALUE(APPEND); |
| CHECK_FLAG_VALUE(NODUMP); |
| CHECK_FLAG_VALUE(NOATIME); |
| CHECK_FLAG_VALUE(DIRTY); |
| CHECK_FLAG_VALUE(COMPRBLK); |
| CHECK_FLAG_VALUE(NOCOMPR); |
| CHECK_FLAG_VALUE(ENCRYPT); |
| CHECK_FLAG_VALUE(INDEX); |
| CHECK_FLAG_VALUE(IMAGIC); |
| CHECK_FLAG_VALUE(JOURNAL_DATA); |
| CHECK_FLAG_VALUE(NOTAIL); |
| CHECK_FLAG_VALUE(DIRSYNC); |
| CHECK_FLAG_VALUE(TOPDIR); |
| CHECK_FLAG_VALUE(HUGE_FILE); |
| CHECK_FLAG_VALUE(EXTENTS); |
| CHECK_FLAG_VALUE(VERITY); |
| CHECK_FLAG_VALUE(EA_INODE); |
| CHECK_FLAG_VALUE(INLINE_DATA); |
| CHECK_FLAG_VALUE(PROJINHERIT); |
| CHECK_FLAG_VALUE(CASEFOLD); |
| CHECK_FLAG_VALUE(RESERVED); |
| } |
| |
| /* Used to pass group descriptor data when online resize is done */ |
| struct ext4_new_group_input { |
| __u32 group; /* Group number for this data */ |
| __u64 block_bitmap; /* Absolute block number of block bitmap */ |
| __u64 inode_bitmap; /* Absolute block number of inode bitmap */ |
| __u64 inode_table; /* Absolute block number of inode table start */ |
| __u32 blocks_count; /* Total number of blocks in this group */ |
| __u16 reserved_blocks; /* Number of reserved blocks in this group */ |
| __u16 unused; |
| }; |
| |
| #if defined(__KERNEL__) && defined(CONFIG_COMPAT) |
| struct compat_ext4_new_group_input { |
| u32 group; |
| compat_u64 block_bitmap; |
| compat_u64 inode_bitmap; |
| compat_u64 inode_table; |
| u32 blocks_count; |
| u16 reserved_blocks; |
| u16 unused; |
| }; |
| #endif |
| |
| /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ |
| struct ext4_new_group_data { |
| __u32 group; |
| __u64 block_bitmap; |
| __u64 inode_bitmap; |
| __u64 inode_table; |
| __u32 blocks_count; |
| __u16 reserved_blocks; |
| __u16 mdata_blocks; |
| __u32 free_clusters_count; |
| }; |
| |
| /* Indexes used to index group tables in ext4_new_group_data */ |
| enum { |
| BLOCK_BITMAP = 0, /* block bitmap */ |
| INODE_BITMAP, /* inode bitmap */ |
| INODE_TABLE, /* inode tables */ |
| GROUP_TABLE_COUNT, |
| }; |
| |
| /* |
| * Flags used by ext4_map_blocks() |
| */ |
| /* Allocate any needed blocks and/or convert an unwritten |
| extent to be an initialized ext4 */ |
| #define EXT4_GET_BLOCKS_CREATE 0x0001 |
| /* Request the creation of an unwritten extent */ |
| #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 |
| #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ |
| EXT4_GET_BLOCKS_CREATE) |
| /* Caller is from the delayed allocation writeout path |
| * finally doing the actual allocation of delayed blocks */ |
| #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 |
| /* caller is from the direct IO path, request to creation of an |
| unwritten extents if not allocated, split the unwritten |
| extent if blocks has been preallocated already*/ |
| #define EXT4_GET_BLOCKS_PRE_IO 0x0008 |
| #define EXT4_GET_BLOCKS_CONVERT 0x0010 |
| #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ |
| EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) |
| /* Convert extent to initialized after IO complete */ |
| #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ |
| EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) |
| /* Eventual metadata allocation (due to growing extent tree) |
| * should not fail, so try to use reserved blocks for that.*/ |
| #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 |
| /* Don't normalize allocation size (used for fallocate) */ |
| #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 |
| /* Convert written extents to unwritten */ |
| #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 |
| /* Write zeros to newly created written extents */ |
| #define EXT4_GET_BLOCKS_ZERO 0x0200 |
| #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ |
| EXT4_GET_BLOCKS_ZERO) |
| /* Caller will submit data before dropping transaction handle. This |
| * allows jbd2 to avoid submitting data before commit. */ |
| #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 |
| /* Caller is in the atomic contex, find extent if it has been cached */ |
| #define EXT4_GET_BLOCKS_CACHED_NOWAIT 0x0800 |
| |
| /* |
| * The bit position of these flags must not overlap with any of the |
| * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), |
| * read_extent_tree_block(), ext4_split_extent_at(), |
| * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). |
| * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be |
| * caching the extents when reading from the extent tree while a |
| * truncate or punch hole operation is in progress. |
| */ |
| #define EXT4_EX_NOCACHE 0x40000000 |
| #define EXT4_EX_FORCE_CACHE 0x20000000 |
| #define EXT4_EX_NOFAIL 0x10000000 |
| |
| /* |
| * Flags used by ext4_free_blocks |
| */ |
| #define EXT4_FREE_BLOCKS_METADATA 0x0001 |
| #define EXT4_FREE_BLOCKS_FORGET 0x0002 |
| #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 |
| #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 |
| #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 |
| #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 |
| #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 |
| |
| /* |
| * ioctl commands |
| */ |
| #define EXT4_IOC_GETVERSION _IOR('f', 3, long) |
| #define EXT4_IOC_SETVERSION _IOW('f', 4, long) |
| #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION |
| #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION |
| #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) |
| #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) |
| #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) |
| #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) |
| #define EXT4_IOC_MIGRATE _IO('f', 9) |
| /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ |
| /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ |
| #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) |
| #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) |
| #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) |
| #define EXT4_IOC_SWAP_BOOT _IO('f', 17) |
| #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) |
| /* ioctl codes 19--39 are reserved for fscrypt */ |
| #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40) |
| #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32) |
| #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap) |
| #define EXT4_IOC_CHECKPOINT _IOW('f', 43, __u32) |
| #define EXT4_IOC_GETFSUUID _IOR('f', 44, struct fsuuid) |
| #define EXT4_IOC_SETFSUUID _IOW('f', 44, struct fsuuid) |
| |
| #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) |
| |
| /* |
| * Flags for going down operation |
| */ |
| #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ |
| #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ |
| #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ |
| |
| /* |
| * Flags returned by EXT4_IOC_GETSTATE |
| * |
| * We only expose to userspace a subset of the state flags in |
| * i_state_flags |
| */ |
| #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001 |
| #define EXT4_STATE_FLAG_NEW 0x00000002 |
| #define EXT4_STATE_FLAG_NEWENTRY 0x00000004 |
| #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008 |
| |
| /* flags for ioctl EXT4_IOC_CHECKPOINT */ |
| #define EXT4_IOC_CHECKPOINT_FLAG_DISCARD 0x1 |
| #define EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT 0x2 |
| #define EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN 0x4 |
| #define EXT4_IOC_CHECKPOINT_FLAG_VALID (EXT4_IOC_CHECKPOINT_FLAG_DISCARD | \ |
| EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT | \ |
| EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN) |
| |
| /* |
| * Structure for EXT4_IOC_GETFSUUID/EXT4_IOC_SETFSUUID |
| */ |
| struct fsuuid { |
| __u32 fsu_len; |
| __u32 fsu_flags; |
| __u8 fsu_uuid[]; |
| }; |
| |
| #if defined(__KERNEL__) && defined(CONFIG_COMPAT) |
| /* |
| * ioctl commands in 32 bit emulation |
| */ |
| #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) |
| #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) |
| #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) |
| #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) |
| #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) |
| #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) |
| #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION |
| #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION |
| #endif |
| |
| /* |
| * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag. |
| * It indicates that the entry in extent status cache is for a hole. |
| */ |
| #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000 |
| |
| /* Max physical block we can address w/o extents */ |
| #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF |
| |
| /* Max logical block we can support */ |
| #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE |
| |
| /* |
| * Structure of an inode on the disk |
| */ |
| struct ext4_inode { |
| __le16 i_mode; /* File mode */ |
| __le16 i_uid; /* Low 16 bits of Owner Uid */ |
| __le32 i_size_lo; /* Size in bytes */ |
| __le32 i_atime; /* Access time */ |
| __le32 i_ctime; /* Inode Change time */ |
| __le32 i_mtime; /* Modification time */ |
| __le32 i_dtime; /* Deletion Time */ |
| __le16 i_gid; /* Low 16 bits of Group Id */ |
| __le16 i_links_count; /* Links count */ |
| __le32 i_blocks_lo; /* Blocks count */ |
| __le32 i_flags; /* File flags */ |
| union { |
| struct { |
| __le32 l_i_version; |
| } linux1; |
| struct { |
| __u32 h_i_translator; |
| } hurd1; |
| struct { |
| __u32 m_i_reserved1; |
| } masix1; |
| } osd1; /* OS dependent 1 */ |
| __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ |
| __le32 i_generation; /* File version (for NFS) */ |
| __le32 i_file_acl_lo; /* File ACL */ |
| __le32 i_size_high; |
| __le32 i_obso_faddr; /* Obsoleted fragment address */ |
| union { |
| struct { |
| __le16 l_i_blocks_high; /* were l_i_reserved1 */ |
| __le16 l_i_file_acl_high; |
| __le16 l_i_uid_high; /* these 2 fields */ |
| __le16 l_i_gid_high; /* were reserved2[0] */ |
| __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ |
| __le16 l_i_reserved; |
| } linux2; |
| struct { |
| __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
| __u16 h_i_mode_high; |
| __u16 h_i_uid_high; |
| __u16 h_i_gid_high; |
| __u32 h_i_author; |
| } hurd2; |
| struct { |
| __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
| __le16 m_i_file_acl_high; |
| __u32 m_i_reserved2[2]; |
| } masix2; |
| } osd2; /* OS dependent 2 */ |
| __le16 i_extra_isize; |
| __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ |
| __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ |
| __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ |
| __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ |
| __le32 i_crtime; /* File Creation time */ |
| __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ |
| __le32 i_version_hi; /* high 32 bits for 64-bit version */ |
| __le32 i_projid; /* Project ID */ |
| }; |
| |
| struct move_extent { |
| __u32 reserved; /* should be zero */ |
| __u32 donor_fd; /* donor file descriptor */ |
| __u64 orig_start; /* logical start offset in block for orig */ |
| __u64 donor_start; /* logical start offset in block for donor */ |
| __u64 len; /* block length to be moved */ |
| __u64 moved_len; /* moved block length */ |
| }; |
| |
| #define EXT4_EPOCH_BITS 2 |
| #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) |
| #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) |
| |
| /* |
| * Extended fields will fit into an inode if the filesystem was formatted |
| * with large inodes (-I 256 or larger) and there are not currently any EAs |
| * consuming all of the available space. For new inodes we always reserve |
| * enough space for the kernel's known extended fields, but for inodes |
| * created with an old kernel this might not have been the case. None of |
| * the extended inode fields is critical for correct filesystem operation. |
| * This macro checks if a certain field fits in the inode. Note that |
| * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize |
| */ |
| #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ |
| ((offsetof(typeof(*ext4_inode), field) + \ |
| sizeof((ext4_inode)->field)) \ |
| <= (EXT4_GOOD_OLD_INODE_SIZE + \ |
| (einode)->i_extra_isize)) \ |
| |
| /* |
| * We use an encoding that preserves the times for extra epoch "00": |
| * |
| * extra msb of adjust for signed |
| * epoch 32-bit 32-bit tv_sec to |
| * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range |
| * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 |
| * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 |
| * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 |
| * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 |
| * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 |
| * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 |
| * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 |
| * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 |
| * |
| * Note that previous versions of the kernel on 64-bit systems would |
| * incorrectly use extra epoch bits 1,1 for dates between 1901 and |
| * 1970. e2fsck will correct this, assuming that it is run on the |
| * affected filesystem before 2242. |
| */ |
| |
| static inline __le32 ext4_encode_extra_time(struct timespec64 *time) |
| { |
| u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; |
| return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); |
| } |
| |
| static inline void ext4_decode_extra_time(struct timespec64 *time, |
| __le32 extra) |
| { |
| if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) |
| time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; |
| time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; |
| } |
| |
| #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ |
| do { \ |
| if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ |
| (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ |
| (raw_inode)->xtime ## _extra = \ |
| ext4_encode_extra_time(&(inode)->xtime); \ |
| } \ |
| else \ |
| (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \ |
| } while (0) |
| |
| #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ |
| do { \ |
| if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ |
| (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ |
| if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ |
| (raw_inode)->xtime ## _extra = \ |
| ext4_encode_extra_time(&(einode)->xtime); \ |
| } while (0) |
| |
| #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ |
| do { \ |
| (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ |
| if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ |
| ext4_decode_extra_time(&(inode)->xtime, \ |
| raw_inode->xtime ## _extra); \ |
| } \ |
| else \ |
| (inode)->xtime.tv_nsec = 0; \ |
| } while (0) |
| |
| |
| #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ |
| do { \ |
| if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ |
| (einode)->xtime.tv_sec = \ |
| (signed)le32_to_cpu((raw_inode)->xtime); \ |
| else \ |
| (einode)->xtime.tv_sec = 0; \ |
| if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ |
| ext4_decode_extra_time(&(einode)->xtime, \ |
| raw_inode->xtime ## _extra); \ |
| else \ |
| (einode)->xtime.tv_nsec = 0; \ |
| } while (0) |
| |
| #define i_disk_version osd1.linux1.l_i_version |
| |
| #if defined(__KERNEL__) || defined(__linux__) |
| #define i_reserved1 osd1.linux1.l_i_reserved1 |
| #define i_file_acl_high osd2.linux2.l_i_file_acl_high |
| #define i_blocks_high osd2.linux2.l_i_blocks_high |
| #define i_uid_low i_uid |
| #define i_gid_low i_gid |
| #define i_uid_high osd2.linux2.l_i_uid_high |
| #define i_gid_high osd2.linux2.l_i_gid_high |
| #define i_checksum_lo osd2.linux2.l_i_checksum_lo |
| |
| #elif defined(__GNU__) |
| |
| #define i_translator osd1.hurd1.h_i_translator |
| #define i_uid_high osd2.hurd2.h_i_uid_high |
| #define i_gid_high osd2.hurd2.h_i_gid_high |
| #define i_author osd2.hurd2.h_i_author |
| |
| #elif defined(__masix__) |
| |
| #define i_reserved1 osd1.masix1.m_i_reserved1 |
| #define i_file_acl_high osd2.masix2.m_i_file_acl_high |
| #define i_reserved2 osd2.masix2.m_i_reserved2 |
| |
| #endif /* defined(__KERNEL__) || defined(__linux__) */ |
| |
| #include "extents_status.h" |
| #include "fast_commit.h" |
| |
| /* |
| * Lock subclasses for i_data_sem in the ext4_inode_info structure. |
| * |
| * These are needed to avoid lockdep false positives when we need to |
| * allocate blocks to the quota inode during ext4_map_blocks(), while |
| * holding i_data_sem for a normal (non-quota) inode. Since we don't |
| * do quota tracking for the quota inode, this avoids deadlock (as |
| * well as infinite recursion, since it isn't turtles all the way |
| * down...) |
| * |
| * I_DATA_SEM_NORMAL - Used for most inodes |
| * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode |
| * where the second inode has larger inode number |
| * than the first |
| * I_DATA_SEM_QUOTA - Used for quota inodes only |
| */ |
| enum { |
| I_DATA_SEM_NORMAL = 0, |
| I_DATA_SEM_OTHER, |
| I_DATA_SEM_QUOTA, |
| }; |
| |
| |
| /* |
| * fourth extended file system inode data in memory |
| */ |
| struct ext4_inode_info { |
| __le32 i_data[15]; /* unconverted */ |
| __u32 i_dtime; |
| ext4_fsblk_t i_file_acl; |
| |
| /* |
| * i_block_group is the number of the block group which contains |
| * this file's inode. Constant across the lifetime of the inode, |
| * it is used for making block allocation decisions - we try to |
| * place a file's data blocks near its inode block, and new inodes |
| * near to their parent directory's inode. |
| */ |
| ext4_group_t i_block_group; |
| ext4_lblk_t i_dir_start_lookup; |
| #if (BITS_PER_LONG < 64) |
| unsigned long i_state_flags; /* Dynamic state flags */ |
| #endif |
| unsigned long i_flags; |
| |
| /* |
| * Extended attributes can be read independently of the main file |
| * data. Taking i_rwsem even when reading would cause contention |
| * between readers of EAs and writers of regular file data, so |
| * instead we synchronize on xattr_sem when reading or changing |
| * EAs. |
| */ |
| struct rw_semaphore xattr_sem; |
| |
| /* |
| * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise |
| * i_orphan is used. |
| */ |
| union { |
| struct list_head i_orphan; /* unlinked but open inodes */ |
| unsigned int i_orphan_idx; /* Index in orphan file */ |
| }; |
| |
| /* Fast commit related info */ |
| |
| /* For tracking dentry create updates */ |
| struct list_head i_fc_dilist; |
| struct list_head i_fc_list; /* |
| * inodes that need fast commit |
| * protected by sbi->s_fc_lock. |
| */ |
| |
| /* Start of lblk range that needs to be committed in this fast commit */ |
| ext4_lblk_t i_fc_lblk_start; |
| |
| /* End of lblk range that needs to be committed in this fast commit */ |
| ext4_lblk_t i_fc_lblk_len; |
| |
| /* Number of ongoing updates on this inode */ |
| atomic_t i_fc_updates; |
| |
| /* Fast commit wait queue for this inode */ |
| wait_queue_head_t i_fc_wait; |
| |
| /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */ |
| struct mutex i_fc_lock; |
| |
| /* |
| * i_disksize keeps track of what the inode size is ON DISK, not |
| * in memory. During truncate, i_size is set to the new size by |
| * the VFS prior to calling ext4_truncate(), but the filesystem won't |
| * set i_disksize to 0 until the truncate is actually under way. |
| * |
| * The intent is that i_disksize always represents the blocks which |
| * are used by this file. This allows recovery to restart truncate |
| * on orphans if we crash during truncate. We actually write i_disksize |
| * into the on-disk inode when writing inodes out, instead of i_size. |
| * |
| * The only time when i_disksize and i_size may be different is when |
| * a truncate is in progress. The only things which change i_disksize |
| * are ext4_get_block (growth) and ext4_truncate (shrinkth). |
| */ |
| loff_t i_disksize; |
| |
| /* |
| * i_data_sem is for serialising ext4_truncate() against |
| * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's |
| * data tree are chopped off during truncate. We can't do that in |
| * ext4 because whenever we perform intermediate commits during |
| * truncate, the inode and all the metadata blocks *must* be in a |
| * consistent state which allows truncation of the orphans to restart |
| * during recovery. Hence we must fix the get_block-vs-truncate race |
| * by other means, so we have i_data_sem. |
| */ |
| struct rw_semaphore i_data_sem; |
| struct inode vfs_inode; |
| struct jbd2_inode *jinode; |
| |
| spinlock_t i_raw_lock; /* protects updates to the raw inode */ |
| |
| /* |
| * File creation time. Its function is same as that of |
| * struct timespec64 i_{a,c,m}time in the generic inode. |
| */ |
| struct timespec64 i_crtime; |
| |
| /* mballoc */ |
| atomic_t i_prealloc_active; |
| struct list_head i_prealloc_list; |
| spinlock_t i_prealloc_lock; |
| |
| /* extents status tree */ |
| struct ext4_es_tree i_es_tree; |
| rwlock_t i_es_lock; |
| struct list_head i_es_list; |
| unsigned int i_es_all_nr; /* protected by i_es_lock */ |
| unsigned int i_es_shk_nr; /* protected by i_es_lock */ |
| ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for |
| extents to shrink. Protected by |
| i_es_lock */ |
| |
| /* ialloc */ |
| ext4_group_t i_last_alloc_group; |
| |
| /* allocation reservation info for delalloc */ |
| /* In case of bigalloc, this refer to clusters rather than blocks */ |
| unsigned int i_reserved_data_blocks; |
| |
| /* pending cluster reservations for bigalloc file systems */ |
| struct ext4_pending_tree i_pending_tree; |
| |
| /* on-disk additional length */ |
| __u16 i_extra_isize; |
| |
| /* Indicate the inline data space. */ |
| u16 i_inline_off; |
| u16 i_inline_size; |
| |
| #ifdef CONFIG_QUOTA |
| /* quota space reservation, managed internally by quota code */ |
| qsize_t i_reserved_quota; |
| #endif |
| |
| /* Lock protecting lists below */ |
| spinlock_t i_completed_io_lock; |
| /* |
| * Completed IOs that need unwritten extents handling and have |
| * transaction reserved |
| */ |
| struct list_head i_rsv_conversion_list; |
| struct work_struct i_rsv_conversion_work; |
| atomic_t i_unwritten; /* Nr. of inflight conversions pending */ |
| |
| spinlock_t i_block_reservation_lock; |
| |
| /* |
| * Transactions that contain inode's metadata needed to complete |
| * fsync and fdatasync, respectively. |
| */ |
| tid_t i_sync_tid; |
| tid_t i_datasync_tid; |
| |
| #ifdef CONFIG_QUOTA |
| struct dquot *i_dquot[MAXQUOTAS]; |
| #endif |
| |
| /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ |
| __u32 i_csum_seed; |
| |
| kprojid_t i_projid; |
| }; |
| |
| /* |
| * File system states |
| */ |
| #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ |
| #define EXT4_ERROR_FS 0x0002 /* Errors detected */ |
| #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ |
| #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */ |
| |
| /* |
| * Misc. filesystem flags |
| */ |
| #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ |
| #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ |
| #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ |
| |
| /* |
| * Mount flags set via mount options or defaults |
| */ |
| #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ |
| #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ |
| #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ |
| #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ |
| #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ |
| #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ |
| #define EXT4_MOUNT_ERRORS_MASK 0x00070 |
| #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ |
| #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ |
| #ifdef CONFIG_FS_DAX |
| #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */ |
| #else |
| #define EXT4_MOUNT_DAX_ALWAYS 0 |
| #endif |
| #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ |
| #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ |
| #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ |
| #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ |
| #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ |
| #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ |
| #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ |
| #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ |
| #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ |
| #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ |
| #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ |
| #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, |
| * enable enforcement for hidden |
| * quota files */ |
| #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable |
| * enforcement for hidden quota |
| * files */ |
| #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota |
| * enforcement */ |
| #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ |
| #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ |
| #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ |
| #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ |
| #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000 |
| #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ |
| #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ |
| #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ |
| #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ |
| #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ |
| |
| /* |
| * Mount flags set either automatically (could not be set by mount option) |
| * based on per file system feature or property or in special cases such as |
| * distinguishing between explicit mount option definition and default. |
| */ |
| #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly |
| specified delalloc */ |
| #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group |
| size of blocksize * 8 |
| blocks */ |
| #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated |
| file systems */ |
| #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly |
| specified journal checksum */ |
| |
| #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */ |
| #define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */ |
| #define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */ |
| #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group |
| * scanning in mballoc |
| */ |
| |
| #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ |
| ~EXT4_MOUNT_##opt |
| #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ |
| EXT4_MOUNT_##opt |
| #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ |
| EXT4_MOUNT_##opt) |
| |
| #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ |
| ~EXT4_MOUNT2_##opt |
| #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ |
| EXT4_MOUNT2_##opt |
| #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ |
| EXT4_MOUNT2_##opt) |
| |
| #define ext4_test_and_set_bit __test_and_set_bit_le |
| #define ext4_set_bit __set_bit_le |
| #define ext4_set_bit_atomic ext2_set_bit_atomic |
| #define ext4_test_and_clear_bit __test_and_clear_bit_le |
| #define ext4_clear_bit __clear_bit_le |
| #define ext4_clear_bit_atomic ext2_clear_bit_atomic |
| #define ext4_test_bit test_bit_le |
| #define ext4_find_next_zero_bit find_next_zero_bit_le |
| #define ext4_find_next_bit find_next_bit_le |
| |
| extern void mb_set_bits(void *bm, int cur, int len); |
| |
| /* |
| * Maximal mount counts between two filesystem checks |
| */ |
| #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ |
| #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ |
| |
| /* |
| * Behaviour when detecting errors |
| */ |
| #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ |
| #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ |
| #define EXT4_ERRORS_PANIC 3 /* Panic */ |
| #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE |
| |
| /* Metadata checksum algorithm codes */ |
| #define EXT4_CRC32C_CHKSUM 1 |
| |
| #define EXT4_LABEL_MAX 16 |
| |
| /* |
| * Structure of the super block |
| */ |
| struct ext4_super_block { |
| /*00*/ __le32 s_inodes_count; /* Inodes count */ |
| __le32 s_blocks_count_lo; /* Blocks count */ |
| __le32 s_r_blocks_count_lo; /* Reserved blocks count */ |
| __le32 s_free_blocks_count_lo; /* Free blocks count */ |
| /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ |
| __le32 s_first_data_block; /* First Data Block */ |
| __le32 s_log_block_size; /* Block size */ |
| __le32 s_log_cluster_size; /* Allocation cluster size */ |
| /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ |
| __le32 s_clusters_per_group; /* # Clusters per group */ |
| __le32 s_inodes_per_group; /* # Inodes per group */ |
| __le32 s_mtime; /* Mount time */ |
| /*30*/ __le32 s_wtime; /* Write time */ |
| __le16 s_mnt_count; /* Mount count */ |
| __le16 s_max_mnt_count; /* Maximal mount count */ |
| __le16 s_magic; /* Magic signature */ |
| __le16 s_state; /* File system state */ |
| __le16 s_errors; /* Behaviour when detecting errors */ |
| __le16 s_minor_rev_level; /* minor revision level */ |
| /*40*/ __le32 s_lastcheck; /* time of last check */ |
| __le32 s_checkinterval; /* max. time between checks */ |
| __le32 s_creator_os; /* OS */ |
| __le32 s_rev_level; /* Revision level */ |
| /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ |
| __le16 s_def_resgid; /* Default gid for reserved blocks */ |
| /* |
| * These fields are for EXT4_DYNAMIC_REV superblocks only. |
| * |
| * Note: the difference between the compatible feature set and |
| * the incompatible feature set is that if there is a bit set |
| * in the incompatible feature set that the kernel doesn't |
| * know about, it should refuse to mount the filesystem. |
| * |
| * e2fsck's requirements are more strict; if it doesn't know |
| * about a feature in either the compatible or incompatible |
| * feature set, it must abort and not try to meddle with |
| * things it doesn't understand... |
| */ |
| __le32 s_first_ino; /* First non-reserved inode */ |
| __le16 s_inode_size; /* size of inode structure */ |
| __le16 s_block_group_nr; /* block group # of this superblock */ |
| __le32 s_feature_compat; /* compatible feature set */ |
| /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ |
| __le32 s_feature_ro_compat; /* readonly-compatible feature set */ |
| /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ |
| /*78*/ char s_volume_name[EXT4_LABEL_MAX]; /* volume name */ |
| /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ |
| /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ |
| /* |
| * Performance hints. Directory preallocation should only |
| * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. |
| */ |
| __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ |
| __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ |
| __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ |
| /* |
| * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. |
| */ |
| /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ |
| /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ |
| __le32 s_journal_dev; /* device number of journal file */ |
| __le32 s_last_orphan; /* start of list of inodes to delete */ |
| __le32 s_hash_seed[4]; /* HTREE hash seed */ |
| __u8 s_def_hash_version; /* Default hash version to use */ |
| __u8 s_jnl_backup_type; |
| __le16 s_desc_size; /* size of group descriptor */ |
| /*100*/ __le32 s_default_mount_opts; |
| __le32 s_first_meta_bg; /* First metablock block group */ |
| __le32 s_mkfs_time; /* When the filesystem was created */ |
| __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ |
| /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ |
| /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ |
| __le32 s_r_blocks_count_hi; /* Reserved blocks count */ |
| __le32 s_free_blocks_count_hi; /* Free blocks count */ |
| __le16 s_min_extra_isize; /* All inodes have at least # bytes */ |
| __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ |
| __le32 s_flags; /* Miscellaneous flags */ |
| __le16 s_raid_stride; /* RAID stride */ |
| __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ |
| __le64 s_mmp_block; /* Block for multi-mount protection */ |
| __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ |
| __u8 s_log_groups_per_flex; /* FLEX_BG group size */ |
| __u8 s_checksum_type; /* metadata checksum algorithm used */ |
| __u8 s_encryption_level; /* versioning level for encryption */ |
| __u8 s_reserved_pad; /* Padding to next 32bits */ |
| __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ |
| __le32 s_snapshot_inum; /* Inode number of active snapshot */ |
| __le32 s_snapshot_id; /* sequential ID of active snapshot */ |
| __le64 s_snapshot_r_blocks_count; /* reserved blocks for active |
| snapshot's future use */ |
| __le32 s_snapshot_list; /* inode number of the head of the |
| on-disk snapshot list */ |
| #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) |
| __le32 s_error_count; /* number of fs errors */ |
| __le32 s_first_error_time; /* first time an error happened */ |
| __le32 s_first_error_ino; /* inode involved in first error */ |
| __le64 s_first_error_block; /* block involved of first error */ |
| __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ |
| __le32 s_first_error_line; /* line number where error happened */ |
| __le32 s_last_error_time; /* most recent time of an error */ |
| __le32 s_last_error_ino; /* inode involved in last error */ |
| __le32 s_last_error_line; /* line number where error happened */ |
| __le64 s_last_error_block; /* block involved of last error */ |
| __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ |
| #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) |
| __u8 s_mount_opts[64]; |
| __le32 s_usr_quota_inum; /* inode for tracking user quota */ |
| __le32 s_grp_quota_inum; /* inode for tracking group quota */ |
| __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ |
| __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ |
| __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ |
| __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ |
| __le32 s_lpf_ino; /* Location of the lost+found inode */ |
| __le32 s_prj_quota_inum; /* inode for tracking project quota */ |
| __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ |
| __u8 s_wtime_hi; |
| __u8 s_mtime_hi; |
| __u8 s_mkfs_time_hi; |
| __u8 s_lastcheck_hi; |
| __u8 s_first_error_time_hi; |
| __u8 s_last_error_time_hi; |
| __u8 s_first_error_errcode; |
| __u8 s_last_error_errcode; |
| __le16 s_encoding; /* Filename charset encoding */ |
| __le16 s_encoding_flags; /* Filename charset encoding flags */ |
| __le32 s_orphan_file_inum; /* Inode for tracking orphan inodes */ |
| __le32 s_reserved[94]; /* Padding to the end of the block */ |
| __le32 s_checksum; /* crc32c(superblock) */ |
| }; |
| |
| #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) |
| |
| #ifdef __KERNEL__ |
| |
| /* Number of quota types we support */ |
| #define EXT4_MAXQUOTAS 3 |
| |
| #define EXT4_ENC_UTF8_12_1 1 |
| |
| /* Types of ext4 journal triggers */ |
| enum ext4_journal_trigger_type { |
| EXT4_JTR_ORPHAN_FILE, |
| EXT4_JTR_NONE /* This must be the last entry for indexing to work! */ |
| }; |
| |
| #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE |
| |
| struct ext4_journal_trigger { |
| struct jbd2_buffer_trigger_type tr_triggers; |
| struct super_block *sb; |
| }; |
| |
| static inline struct ext4_journal_trigger *EXT4_TRIGGER( |
| struct jbd2_buffer_trigger_type *trigger) |
| { |
| return container_of(trigger, struct ext4_journal_trigger, tr_triggers); |
| } |
| |
| #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04 |
| |
| /* Structure at the tail of orphan block */ |
| struct ext4_orphan_block_tail { |
| __le32 ob_magic; |
| __le32 ob_checksum; |
| }; |
| |
| static inline int ext4_inodes_per_orphan_block(struct super_block *sb) |
| { |
| return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) / |
| sizeof(u32); |
| } |
| |
| struct ext4_orphan_block { |
| atomic_t ob_free_entries; /* Number of free orphan entries in block */ |
| struct buffer_head *ob_bh; /* Buffer for orphan block */ |
| }; |
| |
| /* |
| * Info about orphan file. |
| */ |
| struct ext4_orphan_info { |
| int of_blocks; /* Number of orphan blocks in a file */ |
| __u32 of_csum_seed; /* Checksum seed for orphan file */ |
| struct ext4_orphan_block *of_binfo; /* Array with info about orphan |
| * file blocks */ |
| }; |
| |
| /* |
| * fourth extended-fs super-block data in memory |
| */ |
| struct ext4_sb_info { |
| unsigned long s_desc_size; /* Size of a group descriptor in bytes */ |
| unsigned long s_inodes_per_block;/* Number of inodes per block */ |
| unsigned long s_blocks_per_group;/* Number of blocks in a group */ |
| unsigned long s_clusters_per_group; /* Number of clusters in a group */ |
| unsigned long s_inodes_per_group;/* Number of inodes in a group */ |
| unsigned long s_itb_per_group; /* Number of inode table blocks per group */ |
| unsigned long s_gdb_count; /* Number of group descriptor blocks */ |
| unsigned long s_desc_per_block; /* Number of group descriptors per block */ |
| ext4_group_t s_groups_count; /* Number of groups in the fs */ |
| ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ |
| unsigned long s_overhead; /* # of fs overhead clusters */ |
| unsigned int s_cluster_ratio; /* Number of blocks per cluster */ |
| unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ |
| loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ |
| struct buffer_head * s_sbh; /* Buffer containing the super block */ |
| struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ |
| struct buffer_head * __rcu *s_group_desc; |
| unsigned int s_mount_opt; |
| unsigned int s_mount_opt2; |
| unsigned long s_mount_flags; |
| unsigned int s_def_mount_opt; |
| ext4_fsblk_t s_sb_block; |
| atomic64_t s_resv_clusters; |
| kuid_t s_resuid; |
| kgid_t s_resgid; |
| unsigned short s_mount_state; |
| unsigned short s_pad; |
| int s_addr_per_block_bits; |
| int s_desc_per_block_bits; |
| int s_inode_size; |
| int s_first_ino; |
| unsigned int s_inode_readahead_blks; |
| unsigned int s_inode_goal; |
| u32 s_hash_seed[4]; |
| int s_def_hash_version; |
| int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */ |
| struct percpu_counter s_freeclusters_counter; |
| struct percpu_counter s_freeinodes_counter; |
| struct percpu_counter s_dirs_counter; |
| struct percpu_counter s_dirtyclusters_counter; |
| struct percpu_counter s_sra_exceeded_retry_limit; |
| struct blockgroup_lock *s_blockgroup_lock; |
| struct proc_dir_entry *s_proc; |
| struct kobject s_kobj; |
| struct completion s_kobj_unregister; |
| struct super_block *s_sb; |
| struct buffer_head *s_mmp_bh; |
| |
| /* Journaling */ |
| struct journal_s *s_journal; |
| unsigned long s_ext4_flags; /* Ext4 superblock flags */ |
| struct mutex s_orphan_lock; /* Protects on disk list changes */ |
| struct list_head s_orphan; /* List of orphaned inodes in on disk |
| list */ |
| struct ext4_orphan_info s_orphan_info; |
| unsigned long s_commit_interval; |
| u32 s_max_batch_time; |
| u32 s_min_batch_time; |
| struct block_device *s_journal_bdev; |
| #ifdef CONFIG_QUOTA |
| /* Names of quota files with journalled quota */ |
| char __rcu *s_qf_names[EXT4_MAXQUOTAS]; |
| int s_jquota_fmt; /* Format of quota to use */ |
| #endif |
| unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ |
| struct ext4_system_blocks __rcu *s_system_blks; |
| |
| #ifdef EXTENTS_STATS |
| /* ext4 extents stats */ |
| unsigned long s_ext_min; |
| unsigned long s_ext_max; |
| unsigned long s_depth_max; |
| spinlock_t s_ext_stats_lock; |
| unsigned long s_ext_blocks; |
| unsigned long s_ext_extents; |
| #endif |
| |
| /* for buddy allocator */ |
| struct ext4_group_info ** __rcu *s_group_info; |
| struct inode *s_buddy_cache; |
| spinlock_t s_md_lock; |
| unsigned short *s_mb_offsets; |
| unsigned int *s_mb_maxs; |
| unsigned int s_group_info_size; |
| unsigned int s_mb_free_pending; |
| struct list_head s_freed_data_list; /* List of blocks to be freed |
| after commit completed */ |
| struct list_head s_discard_list; |
| struct work_struct s_discard_work; |
| atomic_t s_retry_alloc_pending; |
| struct list_head *s_mb_avg_fragment_size; |
| rwlock_t *s_mb_avg_fragment_size_locks; |
| struct list_head *s_mb_largest_free_orders; |
| rwlock_t *s_mb_largest_free_orders_locks; |
| |
| /* tunables */ |
| unsigned long s_stripe; |
| unsigned int s_mb_max_linear_groups; |
| unsigned int s_mb_stream_request; |
| unsigned int s_mb_max_to_scan; |
| unsigned int s_mb_min_to_scan; |
| unsigned int s_mb_stats; |
| unsigned int s_mb_order2_reqs; |
| unsigned int s_mb_group_prealloc; |
| unsigned int s_mb_max_inode_prealloc; |
| unsigned int s_max_dir_size_kb; |
| /* where last allocation was done - for stream allocation */ |
| unsigned long s_mb_last_group; |
| unsigned long s_mb_last_start; |
| unsigned int s_mb_prefetch; |
| unsigned int s_mb_prefetch_limit; |
| |
| /* stats for buddy allocator */ |
| atomic_t s_bal_reqs; /* number of reqs with len > 1 */ |
| atomic_t s_bal_success; /* we found long enough chunks */ |
| atomic_t s_bal_allocated; /* in blocks */ |
| atomic_t s_bal_ex_scanned; /* total extents scanned */ |
| atomic_t s_bal_groups_scanned; /* number of groups scanned */ |
| atomic_t s_bal_goals; /* goal hits */ |
| atomic_t s_bal_breaks; /* too long searches */ |
| atomic_t s_bal_2orders; /* 2^order hits */ |
| atomic_t s_bal_cr0_bad_suggestions; |
| atomic_t s_bal_cr1_bad_suggestions; |
| atomic64_t s_bal_cX_groups_considered[4]; |
| atomic64_t s_bal_cX_hits[4]; |
| atomic64_t s_bal_cX_failed[4]; /* cX loop didn't find blocks */ |
| atomic_t s_mb_buddies_generated; /* number of buddies generated */ |
| atomic64_t s_mb_generation_time; |
| atomic_t s_mb_lost_chunks; |
| atomic_t s_mb_preallocated; |
| atomic_t s_mb_discarded; |
| atomic_t s_lock_busy; |
| |
| /* locality groups */ |
| struct ext4_locality_group __percpu *s_locality_groups; |
| |
| /* for write statistics */ |
| unsigned long s_sectors_written_start; |
| u64 s_kbytes_written; |
| |
| /* the size of zero-out chunk */ |
| unsigned int s_extent_max_zeroout_kb; |
| |
| unsigned int s_log_groups_per_flex; |
| struct flex_groups * __rcu *s_flex_groups; |
| ext4_group_t s_flex_groups_allocated; |
| |
| /* workqueue for reserved extent conversions (buffered io) */ |
| struct workqueue_struct *rsv_conversion_wq; |
| |
| /* timer for periodic error stats printing */ |
| struct timer_list s_err_report; |
| |
| /* Lazy inode table initialization info */ |
| struct ext4_li_request *s_li_request; |
| /* Wait multiplier for lazy initialization thread */ |
| unsigned int s_li_wait_mult; |
| |
| /* Kernel thread for multiple mount protection */ |
| struct task_struct *s_mmp_tsk; |
| |
| /* record the last minlen when FITRIM is called. */ |
| unsigned long s_last_trim_minblks; |
| |
| /* Reference to checksum algorithm driver via cryptoapi */ |
| struct crypto_shash *s_chksum_driver; |
| |
| /* Precomputed FS UUID checksum for seeding other checksums */ |
| __u32 s_csum_seed; |
| |
| /* Reclaim extents from extent status tree */ |
| struct shrinker s_es_shrinker; |
| struct list_head s_es_list; /* List of inodes with reclaimable extents */ |
| long s_es_nr_inode; |
| struct ext4_es_stats s_es_stats; |
| struct mb_cache *s_ea_block_cache; |
| struct mb_cache *s_ea_inode_cache; |
| spinlock_t s_es_lock ____cacheline_aligned_in_smp; |
| |
| /* Journal triggers for checksum computation */ |
| struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT]; |
| |
| /* Ratelimit ext4 messages. */ |
| struct ratelimit_state s_err_ratelimit_state; |
| struct ratelimit_state s_warning_ratelimit_state; |
| struct ratelimit_state s_msg_ratelimit_state; |
| atomic_t s_warning_count; |
| atomic_t s_msg_count; |
| |
| /* Encryption policy for '-o test_dummy_encryption' */ |
| struct fscrypt_dummy_policy s_dummy_enc_policy; |
| |
| /* |
| * Barrier between writepages ops and changing any inode's JOURNAL_DATA |
| * or EXTENTS flag. |
| */ |
| struct percpu_rw_semaphore s_writepages_rwsem; |
| struct dax_device *s_daxdev; |
| u64 s_dax_part_off; |
| #ifdef CONFIG_EXT4_DEBUG |
| unsigned long s_simulate_fail; |
| #endif |
| /* Record the errseq of the backing block device */ |
| errseq_t s_bdev_wb_err; |
| spinlock_t s_bdev_wb_lock; |
| |
| /* Information about errors that happened during this mount */ |
| spinlock_t s_error_lock; |
| int s_add_error_count; |
| int s_first_error_code; |
| __u32 s_first_error_line; |
| __u32 s_first_error_ino; |
| __u64 s_first_error_block; |
| const char *s_first_error_func; |
| time64_t s_first_error_time; |
| int s_last_error_code; |
| __u32 s_last_error_line; |
| __u32 s_last_error_ino; |
| __u64 s_last_error_block; |
| const char *s_last_error_func; |
| time64_t s_last_error_time; |
| /* |
| * If we are in a context where we cannot update error information in |
| * the on-disk superblock, we queue this work to do it. |
| */ |
| struct work_struct s_error_work; |
| |
| /* Ext4 fast commit sub transaction ID */ |
| atomic_t s_fc_subtid; |
| |
| /* |
| * After commit starts, the main queue gets locked, and the further |
| * updates get added in the staging queue. |
| */ |
| #define FC_Q_MAIN 0 |
| #define FC_Q_STAGING 1 |
| struct list_head s_fc_q[2]; /* Inodes staged for fast commit |
| * that have data changes in them. |
| */ |
| struct list_head s_fc_dentry_q[2]; /* directory entry updates */ |
| unsigned int s_fc_bytes; |
| /* |
| * Main fast commit lock. This lock protects accesses to the |
| * following fields: |
| * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh. |
| */ |
| spinlock_t s_fc_lock; |
| struct buffer_head *s_fc_bh; |
| struct ext4_fc_stats s_fc_stats; |
| tid_t s_fc_ineligible_tid; |
| #ifdef CONFIG_EXT4_DEBUG |
| int s_fc_debug_max_replay; |
| #endif |
| struct ext4_fc_replay_state s_fc_replay_state; |
| }; |
| |
| static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) |
| { |
| return sb->s_fs_info; |
| } |
| static inline struct ext4_inode_info *EXT4_I(struct inode *inode) |
| { |
| return container_of(inode, struct ext4_inode_info, vfs_inode); |
| } |
| |
| static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) |
| { |
| return ino == EXT4_ROOT_INO || |
| (ino >= EXT4_FIRST_INO(sb) && |
| ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); |
| } |
| |
| /* |
| * Returns: sbi->field[index] |
| * Used to access an array element from the following sbi fields which require |
| * rcu protection to avoid dereferencing an invalid pointer due to reassignment |
| * - s_group_desc |
| * - s_group_info |
| * - s_flex_group |
| */ |
| #define sbi_array_rcu_deref(sbi, field, index) \ |
| ({ \ |
| typeof(*((sbi)->field)) _v; \ |
| rcu_read_lock(); \ |
| _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ |
| rcu_read_unlock(); \ |
| _v; \ |
| }) |
| |
| /* |
| * run-time mount flags |
| */ |
| enum { |
| EXT4_MF_MNTDIR_SAMPLED, |
| EXT4_MF_FS_ABORTED, /* Fatal error detected */ |
| EXT4_MF_FC_INELIGIBLE /* Fast commit ineligible */ |
| }; |
| |
| static inline void ext4_set_mount_flag(struct super_block *sb, int bit) |
| { |
| set_bit(bit, &EXT4_SB(sb)->s_mount_flags); |
| } |
| |
| static inline void ext4_clear_mount_flag(struct super_block *sb, int bit) |
| { |
| clear_bit(bit, &EXT4_SB(sb)->s_mount_flags); |
| } |
| |
| static inline int ext4_test_mount_flag(struct super_block *sb, int bit) |
| { |
| return test_bit(bit, &EXT4_SB(sb)->s_mount_flags); |
| } |
| |
| |
| /* |
| * Simulate_fail codes |
| */ |
| #define EXT4_SIM_BBITMAP_EIO 1 |
| #define EXT4_SIM_BBITMAP_CRC 2 |
| #define EXT4_SIM_IBITMAP_EIO 3 |
| #define EXT4_SIM_IBITMAP_CRC 4 |
| #define EXT4_SIM_INODE_EIO 5 |
| #define EXT4_SIM_INODE_CRC 6 |
| #define EXT4_SIM_DIRBLOCK_EIO 7 |
| #define EXT4_SIM_DIRBLOCK_CRC 8 |
| |
| static inline bool ext4_simulate_fail(struct super_block *sb, |
| unsigned long code) |
| { |
| #ifdef CONFIG_EXT4_DEBUG |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| |
| if (unlikely(sbi->s_simulate_fail == code)) { |
| sbi->s_simulate_fail = 0; |
| return true; |
| } |
| #endif |
| return false; |
| } |
| |
| static inline void ext4_simulate_fail_bh(struct super_block *sb, |
| struct buffer_head *bh, |
| unsigned long code) |
| { |
| if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) |
| clear_buffer_uptodate(bh); |
| } |
| |
| /* |
| * Error number codes for s_{first,last}_error_errno |
| * |
| * Linux errno numbers are architecture specific, so we need to translate |
| * them into something which is architecture independent. We don't define |
| * codes for all errno's; just the ones which are most likely to be the cause |
| * of an ext4_error() call. |
| */ |
| #define EXT4_ERR_UNKNOWN 1 |
| #define EXT4_ERR_EIO 2 |
| #define EXT4_ERR_ENOMEM 3 |
| #define EXT4_ERR_EFSBADCRC 4 |
| #define EXT4_ERR_EFSCORRUPTED 5 |
| #define EXT4_ERR_ENOSPC 6 |
| #define EXT4_ERR_ENOKEY 7 |
| #define EXT4_ERR_EROFS 8 |
| #define EXT4_ERR_EFBIG 9 |
| #define EXT4_ERR_EEXIST 10 |
| #define EXT4_ERR_ERANGE 11 |
| #define EXT4_ERR_EOVERFLOW 12 |
| #define EXT4_ERR_EBUSY 13 |
| #define EXT4_ERR_ENOTDIR 14 |
| #define EXT4_ERR_ENOTEMPTY 15 |
| #define EXT4_ERR_ESHUTDOWN 16 |
| #define EXT4_ERR_EFAULT 17 |
| |
| /* |
| * Inode dynamic state flags |
| */ |
| enum { |
| EXT4_STATE_JDATA, /* journaled data exists */ |
| EXT4_STATE_NEW, /* inode is newly created */ |
| EXT4_STATE_XATTR, /* has in-inode xattrs */ |
| EXT4_STATE_NO_EXPAND, /* No space for expansion */ |
| EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ |
| EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ |
| EXT4_STATE_NEWENTRY, /* File just added to dir */ |
| EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ |
| EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ |
| EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ |
| EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ |
| EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */ |
| EXT4_STATE_ORPHAN_FILE, /* Inode orphaned in orphan file */ |
| }; |
| |
| #define EXT4_INODE_BIT_FNS(name, field, offset) \ |
| static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ |
| { \ |
| return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ |
| } \ |
| static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ |
| { \ |
| set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ |
| } \ |
| static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ |
| { \ |
| clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ |
| } |
| |
| /* Add these declarations here only so that these functions can be |
| * found by name. Otherwise, they are very hard to locate. */ |
| static inline int ext4_test_inode_flag(struct inode *inode, int bit); |
| static inline void ext4_set_inode_flag(struct inode *inode, int bit); |
| static inline void ext4_clear_inode_flag(struct inode *inode, int bit); |
| EXT4_INODE_BIT_FNS(flag, flags, 0) |
| |
| /* Add these declarations here only so that these functions can be |
| * found by name. Otherwise, they are very hard to locate. */ |
| static inline int ext4_test_inode_state(struct inode *inode, int bit); |
| static inline void ext4_set_inode_state(struct inode *inode, int bit); |
| static inline void ext4_clear_inode_state(struct inode *inode, int bit); |
| #if (BITS_PER_LONG < 64) |
| EXT4_INODE_BIT_FNS(state, state_flags, 0) |
| |
| static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) |
| { |
| (ei)->i_state_flags = 0; |
| } |
| #else |
| EXT4_INODE_BIT_FNS(state, flags, 32) |
| |
| static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) |
| { |
| /* We depend on the fact that callers will set i_flags */ |
| } |
| #endif |
| #else |
| /* Assume that user mode programs are passing in an ext4fs superblock, not |
| * a kernel struct super_block. This will allow us to call the feature-test |
| * macros from user land. */ |
| #define EXT4_SB(sb) (sb) |
| #endif |
| |
| static inline bool ext4_verity_in_progress(struct inode *inode) |
| { |
| return IS_ENABLED(CONFIG_FS_VERITY) && |
| ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); |
| } |
| |
| #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime |
| |
| /* |
| * Codes for operating systems |
| */ |
| #define EXT4_OS_LINUX 0 |
| #define EXT4_OS_HURD 1 |
| #define EXT4_OS_MASIX 2 |
| #define EXT4_OS_FREEBSD 3 |
| #define EXT4_OS_LITES 4 |
| |
| /* |
| * Revision levels |
| */ |
| #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ |
| #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ |
| |
| #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV |
| |
| #define EXT4_GOOD_OLD_INODE_SIZE 128 |
| |
| #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) |
| #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX |
| #define EXT4_TIMESTAMP_MIN S32_MIN |
| |
| /* |
| * Feature set definitions |
| */ |
| |
| #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 |
| #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 |
| #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 |
| #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 |
| #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 |
| #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 |
| #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 |
| /* |
| * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes |
| * incompatible only if fast commit blocks are present in the FS. Since we |
| * clear the journal (and thus the fast commit blocks), we don't mark FS as |
| * incompatible. We also have a JBD2 incompat feature, which gets set when |
| * there are fast commit blocks present in the journal. |
| */ |
| #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400 |
| #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 |
| #define EXT4_FEATURE_COMPAT_ORPHAN_FILE 0x1000 /* Orphan file exists */ |
| |
| #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 |
| #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 |
| #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 |
| #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 |
| #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 |
| #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 |
| #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 |
| #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 |
| #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 |
| /* |
| * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When |
| * METADATA_CSUM is set, group descriptor checksums use the same algorithm as |
| * all other data structures' checksums. However, the METADATA_CSUM and |
| * GDT_CSUM bits are mutually exclusive. |
| */ |
| #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 |
| #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 |
| #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 |
| #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 |
| #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT 0x10000 /* Orphan file may be |
| non-empty */ |
| |
| #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 |
| #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 |
| #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ |
| #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ |
| #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 |
| #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ |
| #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 |
| #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 |
| #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 |
| #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ |
| #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ |
| #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 |
| #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ |
| #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ |
| #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 |
| #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 |
| |
| extern void ext4_update_dynamic_rev(struct super_block *sb); |
| |
| #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ |
| static inline bool ext4_has_feature_##name(struct super_block *sb) \ |
| { \ |
| return ((EXT4_SB(sb)->s_es->s_feature_compat & \ |
| cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ |
| } \ |
| static inline void ext4_set_feature_##name(struct super_block *sb) \ |
| { \ |
| ext4_update_dynamic_rev(sb); \ |
| EXT4_SB(sb)->s_es->s_feature_compat |= \ |
| cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ |
| } \ |
| static inline void ext4_clear_feature_##name(struct super_block *sb) \ |
| { \ |
| EXT4_SB(sb)->s_es->s_feature_compat &= \ |
| ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ |
| } |
| |
| #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ |
| static inline bool ext4_has_feature_##name(struct super_block *sb) \ |
| { \ |
| return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ |
| cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ |
| } \ |
| static inline void ext4_set_feature_##name(struct super_block *sb) \ |
| { \ |
| ext4_update_dynamic_rev(sb); \ |
| EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ |
| cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ |
| } \ |
| static inline void ext4_clear_feature_##name(struct super_block *sb) \ |
| { \ |
| EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ |
| ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ |
| } |
| |
| #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ |
| static inline bool ext4_has_feature_##name(struct super_block *sb) \ |
| { \ |
| return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ |
| cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ |
| } \ |
| static inline void ext4_set_feature_##name(struct super_block *sb) \ |
| { \ |
| ext4_update_dynamic_rev(sb); \ |
| EXT4_SB(sb)->s_es->s_feature_incompat |= \ |
| cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ |
| } \ |
| static inline void ext4_clear_feature_##name(struct super_block *sb) \ |
| { \ |
| EXT4_SB(sb)->s_es->s_feature_incompat &= \ |
| ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ |
| } |
| |
| EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) |
| EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) |
| EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) |
| EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) |
| EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) |
| EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) |
| EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) |
| EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT) |
| EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) |
| EXT4_FEATURE_COMPAT_FUNCS(orphan_file, ORPHAN_FILE) |
| |
| EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) |
| EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) |
| EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) |
| EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) |
| EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) |
| EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) |
| EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) |
| EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) |
| EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) |
| EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) |
| EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) |
| EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) |
| EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) |
| EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present, ORPHAN_PRESENT) |
| |
| EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) |
| EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) |
| EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) |
| EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) |
| EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) |
| EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) |
| EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) |
| EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) |
| EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) |
| EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) |
| EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) |
| EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) |
| EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) |
| EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) |
| EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) |
| EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) |
| |
| #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR |
| #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ |
| EXT4_FEATURE_INCOMPAT_META_BG) |
| #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
| EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ |
| EXT4_FEATURE_RO_COMPAT_BTREE_DIR) |
| |
| #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR |
| #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ |
| EXT4_FEATURE_INCOMPAT_RECOVER| \ |
| EXT4_FEATURE_INCOMPAT_META_BG) |
| #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
| EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ |
| EXT4_FEATURE_RO_COMPAT_BTREE_DIR) |
| |
| #define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_EXT_ATTR| \ |
| EXT4_FEATURE_COMPAT_ORPHAN_FILE) |
| #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ |
| EXT4_FEATURE_INCOMPAT_RECOVER| \ |
| EXT4_FEATURE_INCOMPAT_META_BG| \ |
| EXT4_FEATURE_INCOMPAT_EXTENTS| \ |
| EXT4_FEATURE_INCOMPAT_64BIT| \ |
| EXT4_FEATURE_INCOMPAT_FLEX_BG| \ |
| EXT4_FEATURE_INCOMPAT_EA_INODE| \ |
| EXT4_FEATURE_INCOMPAT_MMP | \ |
| EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ |
| EXT4_FEATURE_INCOMPAT_ENCRYPT | \ |
| EXT4_FEATURE_INCOMPAT_CASEFOLD | \ |
| EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ |
| EXT4_FEATURE_INCOMPAT_LARGEDIR) |
| #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
| EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ |
| EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ |
| EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ |
| EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ |
| EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ |
| EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ |
| EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ |
| EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ |
| EXT4_FEATURE_RO_COMPAT_QUOTA |\ |
| EXT4_FEATURE_RO_COMPAT_PROJECT |\ |
| EXT4_FEATURE_RO_COMPAT_VERITY |\ |
| EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT) |
| |
| #define EXTN_FEATURE_FUNCS(ver) \ |
| static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ |
| { \ |
| return ((EXT4_SB(sb)->s_es->s_feature_compat & \ |
| cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ |
| } \ |
| static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ |
| { \ |
| return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ |
| cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ |
| } \ |
| static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ |
| { \ |
| return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ |
| cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ |
| } |
| |
| EXTN_FEATURE_FUNCS(2) |
| EXTN_FEATURE_FUNCS(3) |
| EXTN_FEATURE_FUNCS(4) |
| |
| static inline bool ext4_has_compat_features(struct super_block *sb) |
| { |
| return (EXT4_SB(sb)->s_es->s_feature_compat != 0); |
| } |
| static inline bool ext4_has_ro_compat_features(struct super_block *sb) |
| { |
| return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); |
| } |
| static inline bool ext4_has_incompat_features(struct super_block *sb) |
| { |
| return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); |
| } |
| |
| extern int ext4_feature_set_ok(struct super_block *sb, int readonly); |
| |
| /* |
| * Superblock flags |
| */ |
| #define EXT4_FLAGS_RESIZING 0 |
| #define EXT4_FLAGS_SHUTDOWN 1 |
| #define EXT4_FLAGS_BDEV_IS_DAX 2 |
| |
| static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) |
| { |
| return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); |
| } |
| |
| /* |
| * Default values for user and/or group using reserved blocks |
| */ |
| #define EXT4_DEF_RESUID 0 |
| #define EXT4_DEF_RESGID 0 |
| |
| /* |
| * Default project ID |
| */ |
| #define EXT4_DEF_PROJID 0 |
| |
| #define EXT4_DEF_INODE_READAHEAD_BLKS 32 |
| |
| /* |
| * Default mount options |
| */ |
| #define EXT4_DEFM_DEBUG 0x0001 |
| #define EXT4_DEFM_BSDGROUPS 0x0002 |
| #define EXT4_DEFM_XATTR_USER 0x0004 |
| #define EXT4_DEFM_ACL 0x0008 |
| #define EXT4_DEFM_UID16 0x0010 |
| #define EXT4_DEFM_JMODE 0x0060 |
| #define EXT4_DEFM_JMODE_DATA 0x0020 |
| #define EXT4_DEFM_JMODE_ORDERED 0x0040 |
| #define EXT4_DEFM_JMODE_WBACK 0x0060 |
| #define EXT4_DEFM_NOBARRIER 0x0100 |
| #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 |
| #define EXT4_DEFM_DISCARD 0x0400 |
| #define EXT4_DEFM_NODELALLOC 0x0800 |
| |
| /* |
| * Default journal batch times |
| */ |
| #define EXT4_DEF_MIN_BATCH_TIME 0 |
| #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ |
| |
| /* |
| * Minimum number of groups in a flexgroup before we separate out |
| * directories into the first block group of a flexgroup |
| */ |
| #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 |
| |
| /* |
| * Structure of a directory entry |
| */ |
| #define EXT4_NAME_LEN 255 |
| /* |
| * Base length of the ext4 directory entry excluding the name length |
| */ |
| #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN) |
| |
| struct ext4_dir_entry { |
| __le32 inode; /* Inode number */ |
| __le16 rec_len; /* Directory entry length */ |
| __le16 name_len; /* Name length */ |
| char name[EXT4_NAME_LEN]; /* File name */ |
| }; |
| |
| |
| /* |
| * Encrypted Casefolded entries require saving the hash on disk. This structure |
| * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned |
| * boundary. |
| */ |
| struct ext4_dir_entry_hash { |
| __le32 hash; |
| __le32 minor_hash; |
| }; |
| |
| /* |
| * The new version of the directory entry. Since EXT4 structures are |
| * stored in intel byte order, and the name_len field could never be |
| * bigger than 255 chars, it's safe to reclaim the extra byte for the |
| * file_type field. |
| */ |
| struct ext4_dir_entry_2 { |
| __le32 inode; /* Inode number */ |
| __le16 rec_len; /* Directory entry length */ |
| __u8 name_len; /* Name length */ |
| __u8 file_type; /* See file type macros EXT4_FT_* below */ |
| char name[EXT4_NAME_LEN]; /* File name */ |
| }; |
| |
| /* |
| * Access the hashes at the end of ext4_dir_entry_2 |
| */ |
| #define EXT4_DIRENT_HASHES(entry) \ |
| ((struct ext4_dir_entry_hash *) \ |
| (((void *)(entry)) + \ |
| ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND))) |
| #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash) |
| #define EXT4_DIRENT_MINOR_HASH(entry) \ |
| le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash) |
| |
| static inline bool ext4_hash_in_dirent(const struct inode *inode) |
| { |
| return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode); |
| } |
| |
| /* |
| * This is a bogus directory entry at the end of each leaf block that |
| * records checksums. |
| */ |
| struct ext4_dir_entry_tail { |
| __le32 det_reserved_zero1; /* Pretend to be unused */ |
| __le16 det_rec_len; /* 12 */ |
| __u8 det_reserved_zero2; /* Zero name length */ |
| __u8 det_reserved_ft; /* 0xDE, fake file type */ |
| __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ |
| }; |
| |
| #define EXT4_DIRENT_TAIL(block, blocksize) \ |
| ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ |
| ((blocksize) - \ |
| sizeof(struct ext4_dir_entry_tail)))) |
| |
| /* |
| * Ext4 directory file types. Only the low 3 bits are used. The |
| * other bits are reserved for now. |
| */ |
| #define EXT4_FT_UNKNOWN 0 |
| #define EXT4_FT_REG_FILE 1 |
| #define EXT4_FT_DIR 2 |
| #define EXT4_FT_CHRDEV 3 |
| #define EXT4_FT_BLKDEV 4 |
| #define EXT4_FT_FIFO 5 |
| #define EXT4_FT_SOCK 6 |
| #define EXT4_FT_SYMLINK 7 |
| |
| #define EXT4_FT_MAX 8 |
| |
| #define EXT4_FT_DIR_CSUM 0xDE |
| |
| /* |
| * EXT4_DIR_PAD defines the directory entries boundaries |
| * |
| * NOTE: It must be a multiple of 4 |
| */ |
| #define EXT4_DIR_PAD 4 |
| #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) |
| #define EXT4_MAX_REC_LEN ((1<<16)-1) |
| |
| /* |
| * The rec_len is dependent on the type of directory. Directories that are |
| * casefolded and encrypted need to store the hash as well, so we add room for |
| * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should |
| * pass NULL for dir, as those entries do not use the extra fields. |
| */ |
| static inline unsigned int ext4_dir_rec_len(__u8 name_len, |
| const struct inode *dir) |
| { |
| int rec_len = (name_len + 8 + EXT4_DIR_ROUND); |
| |
| if (dir && ext4_hash_in_dirent(dir)) |
| rec_len += sizeof(struct ext4_dir_entry_hash); |
| return (rec_len & ~EXT4_DIR_ROUND); |
| } |
| |
| /* |
| * If we ever get support for fs block sizes > page_size, we'll need |
| * to remove the #if statements in the next two functions... |
| */ |
| static inline unsigned int |
| ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) |
| { |
| unsigned len = le16_to_cpu(dlen); |
| |
| #if (PAGE_SIZE >= 65536) |
| if (len == EXT4_MAX_REC_LEN || len == 0) |
| return blocksize; |
| return (len & 65532) | ((len & 3) << 16); |
| #else |
| return len; |
| #endif |
| } |
| |
| static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) |
| { |
| BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)); |
| #if (PAGE_SIZE >= 65536) |
| if (len < 65536) |
| return cpu_to_le16(len); |
| if (len == blocksize) { |
| if (blocksize == 65536) |
| return cpu_to_le16(EXT4_MAX_REC_LEN); |
| else |
| return cpu_to_le16(0); |
| } |
| return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); |
| #else |
| return cpu_to_le16(len); |
| #endif |
| } |
| |
| /* |
| * Hash Tree Directory indexing |
| * (c) Daniel Phillips, 2001 |
| */ |
| |
| #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ |
| ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) |
| #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ |
| !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) |
| #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) |
| |
| /* Legal values for the dx_root hash_version field: */ |
| |
| #define DX_HASH_LEGACY 0 |
| #define DX_HASH_HALF_MD4 1 |
| #define DX_HASH_TEA 2 |
| #define DX_HASH_LEGACY_UNSIGNED 3 |
| #define DX_HASH_HALF_MD4_UNSIGNED 4 |
| #define DX_HASH_TEA_UNSIGNED 5 |
| #define DX_HASH_SIPHASH 6 |
| |
| static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, |
| const void *address, unsigned int length) |
| { |
| struct { |
| struct shash_desc shash; |
| char ctx[4]; |
| } desc; |
| |
| BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); |
| |
| desc.shash.tfm = sbi->s_chksum_driver; |
| *(u32 *)desc.ctx = crc; |
| |
| BUG_ON(crypto_shash_update(&desc.shash, address, length)); |
| |
| return *(u32 *)desc.ctx; |
| } |
| |
| #ifdef __KERNEL__ |
| |
| /* hash info structure used by the directory hash */ |
| struct dx_hash_info |
| { |
| u32 hash; |
| u32 minor_hash; |
| int hash_version; |
| u32 *seed; |
| }; |
| |
| |
| /* 32 and 64 bit signed EOF for dx directories */ |
| #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) |
| #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) |
| |
| |
| /* |
| * Control parameters used by ext4_htree_next_block |
| */ |
| #define HASH_NB_ALWAYS 1 |
| |
| struct ext4_filename { |
| const struct qstr *usr_fname; |
| struct fscrypt_str disk_name; |
| struct dx_hash_info hinfo; |
| #ifdef CONFIG_FS_ENCRYPTION |
| struct fscrypt_str crypto_buf; |
| #endif |
| #if IS_ENABLED(CONFIG_UNICODE) |
| struct fscrypt_str cf_name; |
| #endif |
| }; |
| |
| #define fname_name(p) ((p)->disk_name.name) |
| #define fname_usr_name(p) ((p)->usr_fname->name) |
| #define fname_len(p) ((p)->disk_name.len) |
| |
| /* |
| * Describe an inode's exact location on disk and in memory |
| */ |
| struct ext4_iloc |
| { |
| struct buffer_head *bh; |
| unsigned long offset; |
| ext4_group_t block_group; |
| }; |
| |
| static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) |
| { |
| return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); |
| } |
| |
| static inline bool ext4_is_quota_file(struct inode *inode) |
| { |
| return IS_NOQUOTA(inode) && |
| !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); |
| } |
| |
| /* |
| * This structure is stuffed into the struct file's private_data field |
| * for directories. It is where we put information so that we can do |
| * readdir operations in hash tree order. |
| */ |
| struct dir_private_info { |
| struct rb_root root; |
| struct rb_node *curr_node; |
| struct fname *extra_fname; |
| loff_t last_pos; |
| __u32 curr_hash; |
| __u32 curr_minor_hash; |
| __u32 next_hash; |
| }; |
| |
| /* calculate the first block number of the group */ |
| static inline ext4_fsblk_t |
| ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) |
| { |
| return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + |
| le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); |
| } |
| |
| /* |
| * Special error return code only used by dx_probe() and its callers. |
| */ |
| #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) |
| |
| /* htree levels for ext4 */ |
| #define EXT4_HTREE_LEVEL_COMPAT 2 |
| #define EXT4_HTREE_LEVEL 3 |
| |
| static inline int ext4_dir_htree_level(struct super_block *sb) |
| { |
| return ext4_has_feature_largedir(sb) ? |
| EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; |
| } |
| |
| /* |
| * Timeout and state flag for lazy initialization inode thread. |
| */ |
| #define EXT4_DEF_LI_WAIT_MULT 10 |
| #define EXT4_DEF_LI_MAX_START_DELAY 5 |
| #define EXT4_LAZYINIT_QUIT 0x0001 |
| #define EXT4_LAZYINIT_RUNNING 0x0002 |
| |
| /* |
| * Lazy inode table initialization info |
| */ |
| struct ext4_lazy_init { |
| unsigned long li_state; |
| struct list_head li_request_list; |
| struct mutex li_list_mtx; |
| }; |
| |
| enum ext4_li_mode { |
| EXT4_LI_MODE_PREFETCH_BBITMAP, |
| EXT4_LI_MODE_ITABLE, |
| }; |
| |
| struct ext4_li_request { |
| struct super_block *lr_super; |
| enum ext4_li_mode lr_mode; |
| ext4_group_t lr_first_not_zeroed; |
| ext4_group_t lr_next_group; |
| struct list_head lr_request; |
| unsigned long lr_next_sched; |
| unsigned long lr_timeout; |
| }; |
| |
| struct ext4_features { |
| struct kobject f_kobj; |
| struct completion f_kobj_unregister; |
| }; |
| |
| /* |
| * This structure will be used for multiple mount protection. It will be |
| * written into the block number saved in the s_mmp_block field in the |
| * superblock. Programs that check MMP should assume that if |
| * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe |
| * to use the filesystem, regardless of how old the timestamp is. |
| */ |
| #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ |
| #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ |
| #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ |
| #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ |
| |
| struct mmp_struct { |
| __le32 mmp_magic; /* Magic number for MMP */ |
| __le32 mmp_seq; /* Sequence no. updated periodically */ |
| |
| /* |
| * mmp_time, mmp_nodename & mmp_bdevname are only used for information |
| * purposes and do not affect the correctness of the algorithm |
| */ |
| __le64 mmp_time; /* Time last updated */ |
| char mmp_nodename[64]; /* Node which last updated MMP block */ |
| char mmp_bdevname[32]; /* Bdev which last updated MMP block */ |
| |
| /* |
| * mmp_check_interval is used to verify if the MMP block has been |
| * updated on the block device. The value is updated based on the |
| * maximum time to write the MMP block during an update cycle. |
| */ |
| __le16 mmp_check_interval; |
| |
| __le16 mmp_pad1; |
| __le32 mmp_pad2[226]; |
| __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ |
| }; |
| |
| /* arguments passed to the mmp thread */ |
| struct mmpd_data { |
| struct buffer_head *bh; /* bh from initial read_mmp_block() */ |
| struct super_block *sb; /* super block of the fs */ |
| }; |
| |
| /* |
| * Check interval multiplier |
| * The MMP block is written every update interval and initially checked every |
| * update interval x the multiplier (the value is then adapted based on the |
| * write latency). The reason is that writes can be delayed under load and we |
| * don't want readers to incorrectly assume that the filesystem is no longer |
| * in use. |
| */ |
| #define EXT4_MMP_CHECK_MULT 2UL |
| |
| /* |
| * Minimum interval for MMP checking in seconds. |
| */ |
| #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL |
| |
| /* |
| * Maximum interval for MMP checking in seconds. |
| */ |
| #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL |
| |
| /* |
| * Function prototypes |
| */ |
| |
| /* |
| * Ok, these declarations are also in <linux/kernel.h> but none of the |
| * ext4 source programs needs to include it so they are duplicated here. |
| */ |
| # define NORET_TYPE /**/ |
| # define ATTRIB_NORET __attribute__((noreturn)) |
| # define NORET_AND noreturn, |
| |
| /* bitmap.c */ |
| extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); |
| void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, |
| struct ext4_group_desc *gdp, |
| struct buffer_head *bh, int sz); |
| int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, |
| struct ext4_group_desc *gdp, |
| struct buffer_head *bh, int sz); |
| void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, |
| struct ext4_group_desc *gdp, |
| struct buffer_head *bh); |
| int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, |
| struct ext4_group_desc *gdp, |
| struct buffer_head *bh); |
| |
| /* balloc.c */ |
| extern void ext4_get_group_no_and_offset(struct super_block *sb, |
| ext4_fsblk_t blocknr, |
| ext4_group_t *blockgrpp, |
| ext4_grpblk_t *offsetp); |
| extern ext4_group_t ext4_get_group_number(struct super_block *sb, |
| ext4_fsblk_t block); |
| |
| extern unsigned int ext4_block_group(struct super_block *sb, |
| ext4_fsblk_t blocknr); |
| extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, |
| ext4_fsblk_t blocknr); |
| extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); |
| extern unsigned long ext4_bg_num_gdb(struct super_block *sb, |
| ext4_group_t group); |
| extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, |
| ext4_fsblk_t goal, |
| unsigned int flags, |
| unsigned long *count, |
| int *errp); |
| extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, |
| s64 nclusters, unsigned int flags); |
| extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); |
| extern void ext4_check_blocks_bitmap(struct super_block *); |
| extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, |
| ext4_group_t block_group, |
| struct buffer_head ** bh); |
| extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); |
| |
| extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, |
| ext4_group_t block_group, |
| bool ignore_locked); |
| extern int ext4_wait_block_bitmap(struct super_block *sb, |
| ext4_group_t block_group, |
| struct buffer_head *bh); |
| extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, |
| ext4_group_t block_group); |
| extern unsigned ext4_free_clusters_after_init(struct super_block *sb, |
| ext4_group_t block_group, |
| struct ext4_group_desc *gdp); |
| ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); |
| |
| #if IS_ENABLED(CONFIG_UNICODE) |
| extern int ext4_fname_setup_ci_filename(struct inode *dir, |
| const struct qstr *iname, |
| struct ext4_filename *fname); |
| #endif |
| |
| /* ext4 encryption related stuff goes here crypto.c */ |
| #ifdef CONFIG_FS_ENCRYPTION |
| extern const struct fscrypt_operations ext4_cryptops; |
| |
| int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname, |
| int lookup, struct ext4_filename *fname); |
| |
| int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry, |
| struct ext4_filename *fname); |
| |
| void ext4_fname_free_filename(struct ext4_filename *fname); |
| |
| int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg); |
| |
| #else /* !CONFIG_FS_ENCRYPTION */ |
| static inline int ext4_fname_setup_filename(struct inode *dir, |
| const struct qstr *iname, |
| int lookup, |
| struct ext4_filename *fname) |
| { |
| int err = 0; |
| fname->usr_fname = iname; |
| fname->disk_name.name = (unsigned char *) iname->name; |
| fname->disk_name.len = iname->len; |
| |
| #if IS_ENABLED(CONFIG_UNICODE) |
| err = ext4_fname_setup_ci_filename(dir, iname, fname); |
| #endif |
| |
| return err; |
| } |
| |
| static inline int ext4_fname_prepare_lookup(struct inode *dir, |
| struct dentry *dentry, |
| struct ext4_filename *fname) |
| { |
| return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); |
| } |
| |
| static inline void ext4_fname_free_filename(struct ext4_filename *fname) |
| { |
| #if IS_ENABLED(CONFIG_UNICODE) |
| kfree(fname->cf_name.name); |
| fname->cf_name.name = NULL; |
| #endif |
| } |
| |
| static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp, |
| void __user *arg) |
| { |
| return -EOPNOTSUPP; |
| } |
| #endif /* !CONFIG_FS_ENCRYPTION */ |
| |
| /* dir.c */ |
| extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, |
| struct file *, |
| struct ext4_dir_entry_2 *, |
| struct buffer_head *, char *, int, |
| unsigned int); |
| #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ |
| unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ |
| (de), (bh), (buf), (size), (offset))) |
| extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, |
| __u32 minor_hash, |
| struct ext4_dir_entry_2 *dirent, |
| struct fscrypt_str *ent_name); |
| extern void ext4_htree_free_dir_info(struct dir_private_info *p); |
| extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, |
| struct buffer_head *bh, |
| void *buf, int buf_size, |
| struct ext4_filename *fname, |
| struct ext4_dir_entry_2 **dest_de); |
| void ext4_insert_dentry(struct inode *dir, struct inode *inode, |
| struct ext4_dir_entry_2 *de, |
| int buf_size, |
| struct ext4_filename *fname); |
| static inline void ext4_update_dx_flag(struct inode *inode) |
| { |
| if (!ext4_has_feature_dir_index(inode->i_sb) && |
| ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) { |
| /* ext4_iget() should have caught this... */ |
| WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); |
| ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); |
| } |
| } |
| static const unsigned char ext4_filetype_table[] = { |
| DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK |
| }; |
| |
| static inline unsigned char get_dtype(struct super_block *sb, int filetype) |
| { |
| if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) |
| return DT_UNKNOWN; |
| |
| return ext4_filetype_table[filetype]; |
| } |
| extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, |
| void *buf, int buf_size); |
| |
| /* fsync.c */ |
| extern int ext4_sync_file(struct file *, loff_t, loff_t, int); |
| |
| /* hash.c */ |
| extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, |
| struct dx_hash_info *hinfo); |
| |
| /* ialloc.c */ |
| extern int ext4_mark_inode_used(struct super_block *sb, int ino); |
| extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *, |
| struct inode *, umode_t, |
| const struct qstr *qstr, __u32 goal, |
| uid_t *owner, __u32 i_flags, |
| int handle_type, unsigned int line_no, |
| int nblocks); |
| |
| #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ |
| __ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr), \ |
| (goal), (owner), i_flags, 0, 0, 0) |
| #define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \ |
| type, nblocks) \ |
| __ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \ |
| 0, (type), __LINE__, (nblocks)) |
| |
| |
| extern void ext4_free_inode(handle_t *, struct inode *); |
| extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); |
| extern unsigned long ext4_count_free_inodes(struct super_block *); |
| extern unsigned long ext4_count_dirs(struct super_block *); |
| extern void ext4_check_inodes_bitmap(struct super_block *); |
| extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); |
| extern int ext4_init_inode_table(struct super_block *sb, |
| ext4_group_t group, int barrier); |
| extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); |
| |
| /* fast_commit.c */ |
| int ext4_fc_info_show(struct seq_file *seq, void *v); |
| void ext4_fc_init(struct super_block *sb, journal_t *journal); |
| void ext4_fc_init_inode(struct inode *inode); |
| void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start, |
| ext4_lblk_t end); |
| void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode, |
| struct dentry *dentry); |
| void __ext4_fc_track_link(handle_t *handle, struct inode *inode, |
| struct dentry *dentry); |
| void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry); |
| void ext4_fc_track_link(handle_t *handle, struct dentry *dentry); |
| void __ext4_fc_track_create(handle_t *handle, struct inode *inode, |
| struct dentry *dentry); |
| void ext4_fc_track_create(handle_t *handle, struct dentry *dentry); |
| void ext4_fc_track_inode(handle_t *handle, struct inode *inode); |
| void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle); |
| void ext4_fc_start_update(struct inode *inode); |
| void ext4_fc_stop_update(struct inode *inode); |
| void ext4_fc_del(struct inode *inode); |
| bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block); |
| void ext4_fc_replay_cleanup(struct super_block *sb); |
| int ext4_fc_commit(journal_t *journal, tid_t commit_tid); |
| int __init ext4_fc_init_dentry_cache(void); |
| void ext4_fc_destroy_dentry_cache(void); |
| int ext4_fc_record_regions(struct super_block *sb, int ino, |
| ext4_lblk_t lblk, ext4_fsblk_t pblk, |
| int len, int replay); |
| |
| /* mballoc.c */ |
| extern const struct seq_operations ext4_mb_seq_groups_ops; |
| extern const struct seq_operations ext4_mb_seq_structs_summary_ops; |
| extern long ext4_mb_stats; |
| extern long ext4_mb_max_to_scan; |
| extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset); |
| extern int ext4_mb_init(struct super_block *); |
| extern int ext4_mb_release(struct super_block *); |
| extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, |
| struct ext4_allocation_request *, int *); |
| extern int ext4_mb_reserve_blocks(struct super_block *, int); |
| extern void ext4_discard_preallocations(struct inode *, unsigned int); |
| extern int __init ext4_init_mballoc(void); |
| extern void ext4_exit_mballoc(void); |
| extern ext4_group_t ext4_mb_prefetch(struct super_block *sb, |
| ext4_group_t group, |
| unsigned int nr, int *cnt); |
| extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group, |
| unsigned int nr); |
| |
| extern void ext4_free_blocks(handle_t *handle, struct inode *inode, |
| struct buffer_head *bh, ext4_fsblk_t block, |
| unsigned long count, int flags); |
| extern int ext4_mb_alloc_groupinfo(struct super_block *sb, |
| ext4_group_t ngroups); |
| extern int ext4_mb_add_groupinfo(struct super_block *sb, |
| ext4_group_t i, struct ext4_group_desc *desc); |
| extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, |
| ext4_fsblk_t block, unsigned long count); |
| extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); |
| extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); |
| extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, |
| int len, int state); |
| |
| /* inode.c */ |
| void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw, |
| struct ext4_inode_info *ei); |
| int ext4_inode_is_fast_symlink(struct inode *inode); |
| struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); |
| struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); |
| int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, |
| bool wait, struct buffer_head **bhs); |
| int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, |
| struct buffer_head *bh_result, int create); |
| int ext4_get_block(struct inode *inode, sector_t iblock, |
| struct buffer_head *bh_result, int create); |
| int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, |
| struct buffer_head *bh, int create); |
| int ext4_walk_page_buffers(handle_t *handle, |
| struct inode *inode, |
| struct buffer_head *head, |
| unsigned from, |
| unsigned to, |
| int *partial, |
| int (*fn)(handle_t *handle, struct inode *inode, |
| struct buffer_head *bh)); |
| int do_journal_get_write_access(handle_t *handle, struct inode *inode, |
| struct buffer_head *bh); |
| #define FALL_BACK_TO_NONDELALLOC 1 |
| #define CONVERT_INLINE_DATA 2 |
| |
| typedef enum { |
| EXT4_IGET_NORMAL = 0, |
| EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ |
| EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */ |
| } ext4_iget_flags; |
| |
| extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, |
| ext4_iget_flags flags, const char *function, |
| unsigned int line); |
| |
| #define ext4_iget(sb, ino, flags) \ |
| __ext4_iget((sb), (ino), (flags), __func__, __LINE__) |
| |
| extern int ext4_write_inode(struct inode *, struct writeback_control *); |
| extern int ext4_setattr(struct user_namespace *, struct dentry *, |
| struct iattr *); |
| extern u32 ext4_dio_alignment(struct inode *inode); |
| extern int ext4_getattr(struct user_namespace *, const struct path *, |
| struct kstat *, u32, unsigned int); |
| extern void ext4_evict_inode(struct inode *); |
| extern void ext4_clear_inode(struct inode *); |
| extern int ext4_file_getattr(struct user_namespace *, const struct path *, |
| struct kstat *, u32, unsigned int); |
| extern int ext4_sync_inode(handle_t *, struct inode *); |
| extern void ext4_dirty_inode(struct inode *, int); |
| extern int ext4_change_inode_journal_flag(struct inode *, int); |
| extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); |
| extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino, |
| struct ext4_iloc *iloc); |
| extern int ext4_inode_attach_jinode(struct inode *inode); |
| extern int ext4_can_truncate(struct inode *inode); |
| extern int ext4_truncate(struct inode *); |
| extern int ext4_break_layouts(struct inode *); |
| extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); |
| extern void ext4_set_inode_flags(struct inode *, bool init); |
| extern int ext4_alloc_da_blocks(struct inode *inode); |
| extern void ext4_set_aops(struct inode *inode); |
| extern int ext4_writepage_trans_blocks(struct inode *); |
| extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); |
| extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, |
| loff_t lstart, loff_t lend); |
| extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); |
| extern qsize_t *ext4_get_reserved_space(struct inode *inode); |
| extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); |
| extern void ext4_da_release_space(struct inode *inode, int to_free); |
| extern void ext4_da_update_reserve_space(struct inode *inode, |
| int used, int quota_claim); |
| extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, |
| ext4_fsblk_t pblk, ext4_lblk_t len); |
| |
| /* indirect.c */ |
| extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, |
| struct ext4_map_blocks *map, int flags); |
| extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); |
| extern void ext4_ind_truncate(handle_t *, struct inode *inode); |
| extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, |
| ext4_lblk_t start, ext4_lblk_t end); |
| |
| /* ioctl.c */ |
| extern long ext4_ioctl(struct file *, unsigned int, unsigned long); |
| extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); |
| int ext4_fileattr_set(struct user_namespace *mnt_userns, |
| struct dentry *dentry, struct fileattr *fa); |
| int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa); |
| extern void ext4_reset_inode_seed(struct inode *inode); |
| int ext4_update_overhead(struct super_block *sb, bool force); |
| |
| /* migrate.c */ |
| extern int ext4_ext_migrate(struct inode *); |
| extern int ext4_ind_migrate(struct inode *inode); |
| |
| /* namei.c */ |
| extern int ext4_init_new_dir(handle_t *handle, struct inode *dir, |
| struct inode *inode); |
| extern int ext4_dirblock_csum_verify(struct inode *inode, |
| struct buffer_head *bh); |
| extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, |
| __u32 start_minor_hash, __u32 *next_hash); |
| extern int ext4_search_dir(struct buffer_head *bh, |
| char *search_buf, |
| int buf_size, |
| struct inode *dir, |
| struct ext4_filename *fname, |
| unsigned int offset, |
| struct ext4_dir_entry_2 **res_dir); |
| extern int ext4_generic_delete_entry(struct inode *dir, |
| struct ext4_dir_entry_2 *de_del, |
| struct buffer_head *bh, |
| void *entry_buf, |
| int buf_size, |
| int csum_size); |
| extern bool ext4_empty_dir(struct inode *inode); |
| |
| /* resize.c */ |
| extern void ext4_kvfree_array_rcu(void *to_free); |
| extern int ext4_group_add(struct super_block *sb, |
| struct ext4_new_group_data *input); |
| extern int ext4_group_extend(struct super_block *sb, |
| struct ext4_super_block *es, |
| ext4_fsblk_t n_blocks_count); |
| extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); |
| extern unsigned int ext4_list_backups(struct super_block *sb, |
| unsigned int *three, unsigned int *five, |
| unsigned int *seven); |
| |
| /* super.c */ |
| extern struct buffer_head *ext4_sb_bread(struct super_block *sb, |
| sector_t block, blk_opf_t op_flags); |
| extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb, |
| sector_t block); |
| extern void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags, |
| bh_end_io_t *end_io); |
| extern int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags, |
| bh_end_io_t *end_io); |
| extern int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait); |
| extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block); |
| extern int ext4_seq_options_show(struct seq_file *seq, void *offset); |
| extern int ext4_calculate_overhead(struct super_block *sb); |
| extern __le32 ext4_superblock_csum(struct super_block *sb, |
| struct ext4_super_block *es); |
| extern void ext4_superblock_csum_set(struct super_block *sb); |
| extern int ext4_alloc_flex_bg_array(struct super_block *sb, |
| ext4_group_t ngroup); |
| extern const char *ext4_decode_error(struct super_block *sb, int errno, |
| char nbuf[16]); |
| extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, |
| ext4_group_t block_group, |
| unsigned int flags); |
| |
| extern __printf(7, 8) |
| void __ext4_error(struct super_block *, const char *, unsigned int, bool, |
| int, __u64, const char *, ...); |
| extern __printf(6, 7) |
| void __ext4_error_inode(struct inode *, const char *, unsigned int, |
| ext4_fsblk_t, int, const char *, ...); |
| extern __printf(5, 6) |
| void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, |
| const char *, ...); |
| extern void __ext4_std_error(struct super_block *, const char *, |
| unsigned int, int); |
| extern __printf(4, 5) |
| void __ext4_warning(struct super_block *, const char *, unsigned int, |
| const char *, ...); |
| extern __printf(4, 5) |
| void __ext4_warning_inode(const struct inode *inode, const char *function, |
| unsigned int line, const char *fmt, ...); |
| extern __printf(3, 4) |
| void __ext4_msg(struct super_block *, const char *, const char *, ...); |
| extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, |
| const char *, unsigned int, const char *); |
| extern __printf(7, 8) |
| void __ext4_grp_locked_error(const char *, unsigned int, |
| struct super_block *, ext4_group_t, |
| unsigned long, ext4_fsblk_t, |
| const char *, ...); |
| |
| #define EXT4_ERROR_INODE(inode, fmt, a...) \ |
| ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) |
| |
| #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ |
| __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) |
| |
| #define ext4_error_inode_block(inode, block, err, fmt, a...) \ |
| __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ |
| (fmt), ## a) |
| |
| #define EXT4_ERROR_FILE(file, block, fmt, a...) \ |
| ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) |
| |
| #define ext4_abort(sb, err, fmt, a...) \ |
| __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a) |
| |
| #ifdef CONFIG_PRINTK |
| |
| #define ext4_error_inode(inode, func, line, block, fmt, ...) \ |
| __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) |
| #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ |
| __ext4_error_inode((inode), (func), (line), (block), \ |
| (err), (fmt), ##__VA_ARGS__) |
| #define ext4_error_file(file, func, line, block, fmt, ...) \ |
| __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) |
| #define ext4_error(sb, fmt, ...) \ |
| __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \ |
| ##__VA_ARGS__) |
| #define ext4_error_err(sb, err, fmt, ...) \ |
| __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \ |
| ##__VA_ARGS__) |
| #define ext4_warning(sb, fmt, ...) \ |
| __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) |
| #define ext4_warning_inode(inode, fmt, ...) \ |
| __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) |
| #define ext4_msg(sb, level, fmt, ...) \ |
| __ext4_msg(sb, level, fmt, ##__VA_ARGS__) |
| #define dump_mmp_msg(sb, mmp, msg) \ |
| __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) |
| #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ |
| __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ |
| fmt, ##__VA_ARGS__) |
| |
| #else |
| |
| #define ext4_error_inode(inode, func, line, block, fmt, ...) \ |
| do { \ |
| no_printk(fmt, ##__VA_ARGS__); \ |
| __ext4_error_inode(inode, "", 0, block, 0, " "); \ |
| } while (0) |
| #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ |
| do { \ |
| no_printk(fmt, ##__VA_ARGS__); \ |
| __ext4_error_inode(inode, "", 0, block, err, " "); \ |
| } while (0) |
| #define ext4_error_file(file, func, line, block, fmt, ...) \ |
| do { \ |
| no_printk(fmt, ##__VA_ARGS__); \ |
| __ext4_error_file(file, "", 0, block, " "); \ |
| } while (0) |
| #define ext4_error(sb, fmt, ...) \ |
| do { \ |
| no_printk(fmt, ##__VA_ARGS__); \ |
| __ext4_error(sb, "", 0, false, 0, 0, " "); \ |
| } while (0) |
| #define ext4_error_err(sb, err, fmt, ...) \ |
| do { \ |
| no_printk(fmt, ##__VA_ARGS__); \ |
| __ext4_error(sb, "", 0, false, err, 0, " "); \ |
| } while (0) |
| #define ext4_warning(sb, fmt, ...) \ |
| do { \ |
| no_printk(fmt, ##__VA_ARGS__); \ |
| __ext4_warning(sb, "", 0, " "); \ |
| } while (0) |
| #define ext4_warning_inode(inode, fmt, ...) \ |
| do { \ |
| no_printk(fmt, ##__VA_ARGS__); \ |
| __ext4_warning_inode(inode, "", 0, " "); \ |
| } while (0) |
| #define ext4_msg(sb, level, fmt, ...) \ |
| do { \ |
| no_printk(fmt, ##__VA_ARGS__); \ |
| __ext4_msg(sb, "", " "); \ |
| } while (0) |
| #define dump_mmp_msg(sb, mmp, msg) \ |
| __dump_mmp_msg(sb, mmp, "", 0, "") |
| #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ |
| do { \ |
| no_printk(fmt, ##__VA_ARGS__); \ |
| __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ |
| } while (0) |
| |
| #endif |
| |
| extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, |
| struct ext4_group_desc *bg); |
| extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, |
| struct ext4_group_desc *bg); |
| extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, |
| struct ext4_group_desc *bg); |
| extern __u32 ext4_free_group_clusters(struct super_block *sb, |
| struct ext4_group_desc *bg); |
| extern __u32 ext4_free_inodes_count(struct super_block *sb, |
| struct ext4_group_desc *bg); |
| extern __u32 ext4_used_dirs_count(struct super_block *sb, |
| struct ext4_group_desc *bg); |
| extern __u32 ext4_itable_unused_count(struct super_block *sb, |
| struct ext4_group_desc *bg); |
| extern void ext4_block_bitmap_set(struct super_block *sb, |
| struct ext4_group_desc *bg, ext4_fsblk_t blk); |
| extern void ext4_inode_bitmap_set(struct super_block *sb, |
| struct ext4_group_desc *bg, ext4_fsblk_t blk); |
| extern void ext4_inode_table_set(struct super_block *sb, |
| struct ext4_group_desc *bg, ext4_fsblk_t blk); |
| extern void ext4_free_group_clusters_set(struct super_block *sb, |
| struct ext4_group_desc *bg, |
| __u32 count); |
| extern void ext4_free_inodes_set(struct super_block *sb, |
| struct ext4_group_desc *bg, __u32 count); |
| extern void ext4_used_dirs_set(struct super_block *sb, |
| struct ext4_group_desc *bg, __u32 count); |
| extern void ext4_itable_unused_set(struct super_block *sb, |
| struct ext4_group_desc *bg, __u32 count); |
| extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, |
| struct ext4_group_desc *gdp); |
| extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, |
| struct ext4_group_desc *gdp); |
| extern int ext4_register_li_request(struct super_block *sb, |
| ext4_group_t first_not_zeroed); |
| |
| static inline int ext4_has_metadata_csum(struct super_block *sb) |
| { |
| WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && |
| !EXT4_SB(sb)->s_chksum_driver); |
| |
| return ext4_has_feature_metadata_csum(sb) && |
| (EXT4_SB(sb)->s_chksum_driver != NULL); |
| } |
| |
| static inline int ext4_has_group_desc_csum(struct super_block *sb) |
| { |
| return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); |
| } |
| |
| #define ext4_read_incompat_64bit_val(es, name) \ |
| (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \ |
| ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \ |
| le32_to_cpu(es->name##_lo)) |
| |
| static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) |
| { |
| return ext4_read_incompat_64bit_val(es, s_blocks_count); |
| } |
| |
| static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) |
| { |
| return ext4_read_incompat_64bit_val(es, s_r_blocks_count); |
| } |
| |
| static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) |
| { |
| return ext4_read_incompat_64bit_val(es, s_free_blocks_count); |
| } |
| |
| static inline void ext4_blocks_count_set(struct ext4_super_block *es, |
| ext4_fsblk_t blk) |
| { |
| es->s_blocks_count_lo = cpu_to_le32((u32)blk); |
| es->s_blocks_count_hi = cpu_to_le32(blk >> 32); |
| } |
| |
| static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, |
| ext4_fsblk_t blk) |
| { |
| es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); |
| es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); |
| } |
| |
| static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, |
| ext4_fsblk_t blk) |
| { |
| es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); |
| es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); |
| } |
| |
| static inline loff_t ext4_isize(struct super_block *sb, |
| struct ext4_inode *raw_inode) |
| { |
| if (ext4_has_feature_largedir(sb) || |
| S_ISREG(le16_to_cpu(raw_inode->i_mode))) |
| return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | |
| le32_to_cpu(raw_inode->i_size_lo); |
| |
| return (loff_t) le32_to_cpu(raw_inode->i_size_lo); |
| } |
| |
| static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) |
| { |
| raw_inode->i_size_lo = cpu_to_le32(i_size); |
| raw_inode->i_size_high = cpu_to_le32(i_size >> 32); |
| } |
| |
| static inline |
| struct ext4_group_info *ext4_get_group_info(struct super_block *sb, |
| ext4_group_t group) |
| { |
| struct ext4_group_info **grp_info; |
| long indexv, indexh; |
| BUG_ON(group >= EXT4_SB(sb)->s_groups_count); |
| indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); |
| indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); |
| grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv); |
| return grp_info[indexh]; |
| } |
| |
| /* |
| * Reading s_groups_count requires using smp_rmb() afterwards. See |
| * the locking protocol documented in the comments of ext4_group_add() |
| * in resize.c |
| */ |
| static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) |
| { |
| ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; |
| |
| smp_rmb(); |
| return ngroups; |
| } |
| |
| static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, |
| ext4_group_t block_group) |
| { |
| return block_group >> sbi->s_log_groups_per_flex; |
| } |
| |
| static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) |
| { |
| return 1 << sbi->s_log_groups_per_flex; |
| } |
| |
| #define ext4_std_error(sb, errno) \ |
| do { \ |
| if ((errno)) \ |
| __ext4_std_error((sb), __func__, __LINE__, (errno)); \ |
| } while (0) |
| |
| #ifdef CONFIG_SMP |
| /* Each CPU can accumulate percpu_counter_batch clusters in their local |
| * counters. So we need to make sure we have free clusters more |
| * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. |
| */ |
| #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) |
| #else |
| #define EXT4_FREECLUSTERS_WATERMARK 0 |
| #endif |
| |
| /* Update i_disksize. Requires i_rwsem to avoid races with truncate */ |
| static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) |
| { |
| WARN_ON_ONCE(S_ISREG(inode->i_mode) && |
| !inode_is_locked(inode)); |
| down_write(&EXT4_I(inode)->i_data_sem); |
| if (newsize > EXT4_I(inode)->i_disksize) |
| WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); |
| up_write(&EXT4_I(inode)->i_data_sem); |
| } |
| |
| /* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */ |
| static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) |
| { |
| int changed = 0; |
| |
| if (newsize > inode->i_size) { |
| i_size_write(inode, newsize); |
| changed = 1; |
| } |
| if (newsize > EXT4_I(inode)->i_disksize) { |
| ext4_update_i_disksize(inode, newsize); |
| changed |= 2; |
| } |
| return changed; |
| } |
| |
| int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, |
| loff_t len); |
| |
| struct ext4_group_info { |
| unsigned long bb_state; |
| #ifdef AGGRESSIVE_CHECK |
| unsigned long bb_check_counter; |
| #endif |
| struct rb_root bb_free_root; |
| ext4_grpblk_t bb_first_free; /* first free block */ |
| ext4_grpblk_t bb_free; /* total free blocks */ |
| ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ |
| int bb_avg_fragment_size_order; /* order of average |
| fragment in BG */ |
| ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ |
| ext4_group_t bb_group; /* Group number */ |
| struct list_head bb_prealloc_list; |
| #ifdef DOUBLE_CHECK |
| void *bb_bitmap; |
| #endif |
| struct rw_semaphore alloc_sem; |
| struct list_head bb_avg_fragment_size_node; |
| struct list_head bb_largest_free_order_node; |
| ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block |
| * regions, index is order. |
| * bb_counters[3] = 5 means |
| * 5 free 8-block regions. */ |
| }; |
| |
| #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 |
| #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 |
| #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 |
| #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 |
| #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ |
| (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) |
| #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ |
| (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) |
| #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4 |
| |
| #define EXT4_MB_GRP_NEED_INIT(grp) \ |
| (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) |
| #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ |
| (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) |
| #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ |
| (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) |
| |
| #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ |
| (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) |
| #define EXT4_MB_GRP_SET_TRIMMED(grp) \ |
| (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) |
| #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ |
| (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) |
| #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \ |
| (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state))) |
| |
| #define EXT4_MAX_CONTENTION 8 |
| #define EXT4_CONTENTION_THRESHOLD 2 |
| |
| static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, |
| ext4_group_t group) |
| { |
| return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); |
| } |
| |
| /* |
| * Returns true if the filesystem is busy enough that attempts to |
| * access the block group locks has run into contention. |
| */ |
| static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) |
| { |
| return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); |
| } |
| |
| static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) |
| { |
| spinlock_t *lock = ext4_group_lock_ptr(sb, group); |
| if (spin_trylock(lock)) |
| /* |
| * We're able to grab the lock right away, so drop the |
| * lock contention counter. |
| */ |
| atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); |
| else { |
| /* |
| * The lock is busy, so bump the contention counter, |
| * and then wait on the spin lock. |
| */ |
| atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, |
| EXT4_MAX_CONTENTION); |
| spin_lock(lock); |
| } |
| } |
| |
| static inline void ext4_unlock_group(struct super_block *sb, |
| ext4_group_t group) |
| { |
| spin_unlock(ext4_group_lock_ptr(sb, group)); |
| } |
| |
| #ifdef CONFIG_QUOTA |
| static inline bool ext4_quota_capable(struct super_block *sb) |
| { |
| return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb)); |
| } |
| |
| static inline bool ext4_is_quota_journalled(struct super_block *sb) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| |
| return (ext4_has_feature_quota(sb) || |
| sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]); |
| } |
| int ext4_enable_quotas(struct super_block *sb); |
| #endif |
| |
| /* |
| * Block validity checking |
| */ |
| #define ext4_check_indirect_blockref(inode, bh) \ |
| ext4_check_blockref(__func__, __LINE__, inode, \ |
| (__le32 *)(bh)->b_data, \ |
| EXT4_ADDR_PER_BLOCK((inode)->i_sb)) |
| |
| #define ext4_ind_check_inode(inode) \ |
| ext4_check_blockref(__func__, __LINE__, inode, \ |
| EXT4_I(inode)->i_data, \ |
| EXT4_NDIR_BLOCKS) |
| |
| /* |
| * Inodes and files operations |
| */ |
| |
| /* dir.c */ |
| extern const struct file_operations ext4_dir_operations; |
| |
| /* file.c */ |
| extern const struct inode_operations ext4_file_inode_operations; |
| extern const struct file_operations ext4_file_operations; |
| extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); |
| |
| /* inline.c */ |
| extern int ext4_get_max_inline_size(struct inode *inode); |
| extern int ext4_find_inline_data_nolock(struct inode *inode); |
| extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, |
| unsigned int len); |
| extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); |
| |
| extern int ext4_readpage_inline(struct inode *inode, struct page *page); |
| extern int ext4_try_to_write_inline_data(struct address_space *mapping, |
| struct inode *inode, |
| loff_t pos, unsigned len, |
| struct page **pagep); |
| extern int ext4_write_inline_data_end(struct inode *inode, |
| loff_t pos, unsigned len, |
| unsigned copied, |
| struct page *page); |
| extern struct buffer_head * |
| ext4_journalled_write_inline_data(struct inode *inode, |
| unsigned len, |
| struct page *page); |
| extern int ext4_da_write_inline_data_begin(struct address_space *mapping, |
| struct inode *inode, |
| loff_t pos, unsigned len, |
| struct page **pagep, |
| void **fsdata); |
| extern int ext4_try_add_inline_entry(handle_t *handle, |
| struct ext4_filename *fname, |
| struct inode *dir, struct inode *inode); |
| extern int ext4_try_create_inline_dir(handle_t *handle, |
| struct inode *parent, |
| struct inode *inode); |
| extern int ext4_read_inline_dir(struct file *filp, |
| struct dir_context *ctx, |
| int *has_inline_data); |
| extern int ext4_inlinedir_to_tree(struct file *dir_file, |
| struct inode *dir, ext4_lblk_t block, |
| struct dx_hash_info *hinfo, |
| __u32 start_hash, __u32 start_minor_hash, |
| int *has_inline_data); |
| extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, |
| struct ext4_filename *fname, |
| struct ext4_dir_entry_2 **res_dir, |
| int *has_inline_data); |
| extern int ext4_delete_inline_entry(handle_t *handle, |
| struct inode *dir, |
| struct ext4_dir_entry_2 *de_del, |
| struct buffer_head *bh, |
| int *has_inline_data); |
| extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); |
| extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, |
| struct ext4_dir_entry_2 **parent_de, |
| int *retval); |
| extern void *ext4_read_inline_link(struct inode *inode); |
| |
| struct iomap; |
| extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); |
| |
| extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); |
| |
| extern int ext4_convert_inline_data(struct inode *inode); |
| |
| static inline int ext4_has_inline_data(struct inode *inode) |
| { |
| return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && |
| EXT4_I(inode)->i_inline_off; |
| } |
| |
| /* namei.c */ |
| extern const struct inode_operations ext4_dir_inode_operations; |
| extern const struct inode_operations ext4_special_inode_operations; |
| extern struct dentry *ext4_get_parent(struct dentry *child); |
| extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, |
| struct ext4_dir_entry_2 *de, |
| int blocksize, int csum_size, |
| unsigned int parent_ino, int dotdot_real_len); |
| extern void ext4_initialize_dirent_tail(struct buffer_head *bh, |
| unsigned int blocksize); |
| extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, |
| struct buffer_head *bh); |
| extern int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name, |
| struct inode *inode); |
| extern int __ext4_link(struct inode *dir, struct inode *inode, |
| struct dentry *dentry); |
| |
| #define S_SHIFT 12 |
| static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { |
| [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, |
| [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, |
| [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, |
| [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, |
| [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, |
| [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, |
| [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, |
| }; |
| |
| static inline void ext4_set_de_type(struct super_block *sb, |
| struct ext4_dir_entry_2 *de, |
| umode_t mode) { |
| if (ext4_has_feature_filetype(sb)) |
| de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; |
| } |
| |
| /* readpages.c */ |
| extern int ext4_mpage_readpages(struct inode *inode, |
| struct readahead_control *rac, struct page *page); |
| extern int __init ext4_init_post_read_processing(void); |
| extern void ext4_exit_post_read_processing(void); |
| |
| /* symlink.c */ |
| extern const struct inode_operations ext4_encrypted_symlink_inode_operations; |
| extern const struct inode_operations ext4_symlink_inode_operations; |
| extern const struct inode_operations ext4_fast_symlink_inode_operations; |
| |
| /* sysfs.c */ |
| extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi); |
| extern int ext4_register_sysfs(struct super_block *sb); |
| extern void ext4_unregister_sysfs(struct super_block *sb); |
| extern int __init ext4_init_sysfs(void); |
| extern void ext4_exit_sysfs(void); |
| |
| /* block_validity */ |
| extern void ext4_release_system_zone(struct super_block *sb); |
| extern int ext4_setup_system_zone(struct super_block *sb); |
| extern int __init ext4_init_system_zone(void); |
| extern void ext4_exit_system_zone(void); |
| extern int ext4_inode_block_valid(struct inode *inode, |
| ext4_fsblk_t start_blk, |
| unsigned int count); |
| extern int ext4_check_blockref(const char *, unsigned int, |
| struct inode *, __le32 *, unsigned int); |
| extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode, |
| ext4_fsblk_t start_blk, unsigned int count); |
| |
| |
| /* extents.c */ |
| struct ext4_ext_path; |
| struct ext4_extent; |
| |
| /* |
| * Maximum number of logical blocks in a file; ext4_extent's ee_block is |
| * __le32. |
| */ |
| #define EXT_MAX_BLOCKS 0xffffffff |
| |
| extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); |
| extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); |
| extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, |
| struct ext4_map_blocks *map, int flags); |
| extern int ext4_ext_truncate(handle_t *, struct inode *); |
| extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, |
| ext4_lblk_t end); |
| extern void ext4_ext_init(struct super_block *); |
| extern void ext4_ext_release(struct super_block *); |
| extern long ext4_fallocate(struct file *file, int mode, loff_t offset, |
| loff_t len); |
| extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, |
| loff_t offset, ssize_t len); |
| extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, |
| ext4_io_end_t *io_end); |
| extern int ext4_map_blocks(handle_t *handle, struct inode *inode, |
| struct ext4_map_blocks *map, int flags); |
| extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, |
| int num, |
| struct ext4_ext_path *path); |
| extern int ext4_ext_insert_extent(handle_t *, struct inode *, |
| struct ext4_ext_path **, |
| struct ext4_extent *, int); |
| extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, |
| struct ext4_ext_path **, |
| int flags); |
| extern void ext4_free_ext_path(struct ext4_ext_path *); |
| extern int ext4_ext_check_inode(struct inode *inode); |
| extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); |
| extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
| __u64 start, __u64 len); |
| extern int ext4_get_es_cache(struct inode *inode, |
| struct fiemap_extent_info *fieinfo, |
| __u64 start, __u64 len); |
| extern int ext4_ext_precache(struct inode *inode); |
| extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, |
| struct inode *inode2, ext4_lblk_t lblk1, |
| ext4_lblk_t lblk2, ext4_lblk_t count, |
| int mark_unwritten,int *err); |
| extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); |
| extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, |
| int check_cred, int restart_cred, |
| int revoke_cred); |
| extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end); |
| extern int ext4_ext_replay_set_iblocks(struct inode *inode); |
| extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start, |
| int len, int unwritten, ext4_fsblk_t pblk); |
| extern int ext4_ext_clear_bb(struct inode *inode); |
| |
| |
| /* move_extent.c */ |
| extern void ext4_double_down_write_data_sem(struct inode *first, |
| struct inode *second); |
| extern void ext4_double_up_write_data_sem(struct inode *orig_inode, |
| struct inode *donor_inode); |
| extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, |
| __u64 start_orig, __u64 start_donor, |
| __u64 len, __u64 *moved_len); |
| |
| /* page-io.c */ |
| extern int __init ext4_init_pageio(void); |
| extern void ext4_exit_pageio(void); |
| extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); |
| extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); |
| extern int ext4_put_io_end(ext4_io_end_t *io_end); |
| extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); |
| extern void ext4_io_submit_init(struct ext4_io_submit *io, |
| struct writeback_control *wbc); |
| extern void ext4_end_io_rsv_work(struct work_struct *work); |
| extern void ext4_io_submit(struct ext4_io_submit *io); |
| extern int ext4_bio_write_page(struct ext4_io_submit *io, |
| struct page *page, |
| int len, |
| bool keep_towrite); |
| extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); |
| extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); |
| |
| /* mmp.c */ |
| extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); |
| |
| /* mmp.c */ |
| extern void ext4_stop_mmpd(struct ext4_sb_info *sbi); |
| |
| /* verity.c */ |
| extern const struct fsverity_operations ext4_verityops; |
| |
| /* orphan.c */ |
| extern int ext4_orphan_add(handle_t *, struct inode *); |
| extern int ext4_orphan_del(handle_t *, struct inode *); |
| extern void ext4_orphan_cleanup(struct super_block *sb, |
| struct ext4_super_block *es); |
| extern void ext4_release_orphan_info(struct super_block *sb); |
| extern int ext4_init_orphan_info(struct super_block *sb); |
| extern int ext4_orphan_file_empty(struct super_block *sb); |
| extern void ext4_orphan_file_block_trigger( |
| struct jbd2_buffer_trigger_type *triggers, |
| struct buffer_head *bh, |
| void *data, size_t size); |
| |
| /* |
| * Add new method to test whether block and inode bitmaps are properly |
| * initialized. With uninit_bg reading the block from disk is not enough |
| * to mark the bitmap uptodate. We need to also zero-out the bitmap |
| */ |
| #define BH_BITMAP_UPTODATE BH_JBDPrivateStart |
| |
| static inline int bitmap_uptodate(struct buffer_head *bh) |
| { |
| return (buffer_uptodate(bh) && |
| test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); |
| } |
| static inline void set_bitmap_uptodate(struct buffer_head *bh) |
| { |
| set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); |
| } |
| |
| #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) |
| |
| /* For ioend & aio unwritten conversion wait queues */ |
| #define EXT4_WQ_HASH_SZ 37 |
| #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ |
| EXT4_WQ_HASH_SZ]) |
| extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; |
| |
| extern int ext4_resize_begin(struct super_block *sb); |
| extern int ext4_resize_end(struct super_block *sb, bool update_backups); |
| |
| static inline void ext4_set_io_unwritten_flag(struct inode *inode, |
| struct ext4_io_end *io_end) |
| { |
| if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { |
| io_end->flag |= EXT4_IO_END_UNWRITTEN; |
| atomic_inc(&EXT4_I(inode)->i_unwritten); |
| } |
| } |
| |
| static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) |
| { |
| struct inode *inode = io_end->inode; |
| |
| if (io_end->flag & EXT4_IO_END_UNWRITTEN) { |
| io_end->flag &= ~EXT4_IO_END_UNWRITTEN; |
| /* Wake up anyone waiting on unwritten extent conversion */ |
| if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) |
| wake_up_all(ext4_ioend_wq(inode)); |
| } |
| } |
| |
| extern const struct iomap_ops ext4_iomap_ops; |
| extern const struct iomap_ops ext4_iomap_overwrite_ops; |
| extern const struct iomap_ops ext4_iomap_report_ops; |
| |
| static inline int ext4_buffer_uptodate(struct buffer_head *bh) |
| { |
| /* |
| * If the buffer has the write error flag, we have failed |
| * to write out data in the block. In this case, we don't |
| * have to read the block because we may read the old data |
| * successfully. |
| */ |
| if (buffer_write_io_error(bh)) |
| set_buffer_uptodate(bh); |
| return buffer_uptodate(bh); |
| } |
| |
| #endif /* __KERNEL__ */ |
| |
| #define EFSBADCRC EBADMSG /* Bad CRC detected */ |
| #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ |
| |
| #endif /* _EXT4_H */ |
