// SPDX-License-Identifier: GPL-2.0 /* * ext4.h * * Copyright (C) 1992, 1993, 1994, 1995 * Remy Card ([email protected]) * 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 <uapi/linux/ext4.h> #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 … #else #define ext4_debug(fmt, ...) … #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, ...) … #else #define ext_debug … #endif #define ASSERT(assert) … /* data type for block offset of block group */ ext4_grpblk_t; /* data type for filesystem-wide blocks number */ ext4_fsblk_t; /* data type for file logical block number */ ext4_lblk_t; /* data type for block group number */ ext4_group_t; enum SHIFT_DIRECTION { … }; /* * For each criteria, mballoc has slightly different way of finding * the required blocks nad usually, higher the criteria the slower the * allocation. We start at lower criterias and keep falling back to * higher ones if we are not able to find any blocks. Lower (earlier) * criteria are faster. */ enum criteria { … }; /* * 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 … /* blocks already reserved */ #define EXT4_MB_HINT_RESERVED … /* metadata is being allocated */ #define EXT4_MB_HINT_METADATA … /* first blocks in the file */ #define EXT4_MB_HINT_FIRST … /* search for the best chunk */ #define EXT4_MB_HINT_BEST … /* data is being allocated */ #define EXT4_MB_HINT_DATA … /* don't preallocate (for tails) */ #define EXT4_MB_HINT_NOPREALLOC … /* allocate for locality group */ #define EXT4_MB_HINT_GROUP_ALLOC … /* allocate goal blocks or none */ #define EXT4_MB_HINT_GOAL_ONLY … /* goal is meaningful */ #define EXT4_MB_HINT_TRY_GOAL … /* blocks already pre-reserved by delayed allocation */ #define EXT4_MB_DELALLOC_RESERVED … /* We are doing stream allocation */ #define EXT4_MB_STREAM_ALLOC … /* Use reserved root blocks if needed */ #define EXT4_MB_USE_ROOT_BLOCKS … /* Use blocks from reserved pool */ #define EXT4_MB_USE_RESERVED … /* Do strict check for free blocks while retrying block allocation */ #define EXT4_MB_STRICT_CHECK … /* Large fragment size list lookup succeeded at least once for * CR_POWER2_ALIGNED */ #define EXT4_MB_CR_POWER2_ALIGNED_OPTIMIZED … /* Avg fragment size rb tree lookup succeeded at least once for * CR_GOAL_LEN_FAST */ #define EXT4_MB_CR_GOAL_LEN_FAST_OPTIMIZED … /* Avg fragment size rb tree lookup succeeded at least once for * CR_BEST_AVAIL_LEN */ #define EXT4_MB_CR_BEST_AVAIL_LEN_OPTIMIZED … struct ext4_allocation_request { … }; /* * 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 … #define EXT4_MAP_MAPPED … #define EXT4_MAP_UNWRITTEN … #define EXT4_MAP_BOUNDARY … #define EXT4_MAP_DELAYED … #define EXT4_MAP_FLAGS … struct ext4_map_blocks { … }; /* * Block validity checking, system zone rbtree. */ struct ext4_system_blocks { … }; /* * Flags for ext4_io_end->flags */ #define EXT4_IO_END_UNWRITTEN … struct ext4_io_end_vec { … }; /* * For converting unwritten extents on a work queue. 'handle' is used for * buffered writeback. */ ext4_io_end_t; struct ext4_io_submit { … }; /* * Special inodes numbers */ #define EXT4_BAD_INO … #define EXT4_ROOT_INO … #define EXT4_USR_QUOTA_INO … #define EXT4_GRP_QUOTA_INO … #define EXT4_BOOT_LOADER_INO … #define EXT4_UNDEL_DIR_INO … #define EXT4_RESIZE_INO … #define EXT4_JOURNAL_INO … /* First non-reserved inode for old ext4 filesystems */ #define EXT4_GOOD_OLD_FIRST_INO … /* * Maximal count of links to a file */ #define EXT4_LINK_MAX … /* * Macro-instructions used to manage several block sizes */ #define EXT4_MIN_BLOCK_SIZE … #define EXT4_MAX_BLOCK_SIZE … #define EXT4_MIN_BLOCK_LOG_SIZE … #define EXT4_MAX_BLOCK_LOG_SIZE … #define EXT4_MAX_CLUSTER_LOG_SIZE … #ifdef __KERNEL__ #define EXT4_BLOCK_SIZE(s) … #else #define EXT4_BLOCK_SIZE … #endif #define EXT4_ADDR_PER_BLOCK(s) … #define EXT4_CLUSTER_SIZE(s) … #ifdef __KERNEL__ #define EXT4_BLOCK_SIZE_BITS(s) … #define EXT4_CLUSTER_BITS(s) … #else #define EXT4_BLOCK_SIZE_BITS … #endif #ifdef __KERNEL__ #define EXT4_ADDR_PER_BLOCK_BITS(s) … #define EXT4_INODE_SIZE(s) … #define EXT4_FIRST_INO(s) … #else #define EXT4_INODE_SIZE … #define EXT4_FIRST_INO … #endif #define EXT4_BLOCK_ALIGN(size, blkbits) … #define EXT4_MAX_BLOCKS(size, offset, blkbits) … /* Translate a block number to a cluster number */ #define EXT4_B2C(sbi, blk) … /* Translate a cluster number to a block number */ #define EXT4_C2B(sbi, cluster) … /* Translate # of blks to # of clusters */ #define EXT4_NUM_B2C(sbi, blks) … /* Mask out the low bits to get the starting block of the cluster */ #define EXT4_PBLK_CMASK(s, pblk) … #define EXT4_LBLK_CMASK(s, lblk) … /* Fill in the low bits to get the last block of the cluster */ #define EXT4_LBLK_CFILL(sbi, lblk) … /* Get the cluster offset */ #define EXT4_PBLK_COFF(s, pblk) … #define EXT4_LBLK_COFF(s, lblk) … /* * Structure of a blocks group descriptor */ struct ext4_group_desc { … }; #define EXT4_BG_INODE_BITMAP_CSUM_HI_END … #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END … /* * Structure of a flex block group info */ struct flex_groups { … }; #define EXT4_BG_INODE_UNINIT … #define EXT4_BG_BLOCK_UNINIT … #define EXT4_BG_INODE_ZEROED … /* * Macro-instructions used to manage group descriptors */ #define EXT4_MIN_DESC_SIZE … #define EXT4_MIN_DESC_SIZE_64BIT … #define EXT4_MAX_DESC_SIZE … #define EXT4_DESC_SIZE(s) … #ifdef __KERNEL__ #define EXT4_BLOCKS_PER_GROUP(s) … #define EXT4_CLUSTERS_PER_GROUP(s) … #define EXT4_DESC_PER_BLOCK(s) … #define EXT4_INODES_PER_GROUP(s) … #define EXT4_DESC_PER_BLOCK_BITS(s) … #else #define EXT4_BLOCKS_PER_GROUP … #define EXT4_DESC_PER_BLOCK … #define EXT4_INODES_PER_GROUP … #endif /* * Constants relative to the data blocks */ #define EXT4_NDIR_BLOCKS … #define EXT4_IND_BLOCK … #define EXT4_DIND_BLOCK … #define EXT4_TIND_BLOCK … #define EXT4_N_BLOCKS … /* * Inode flags */ #define EXT4_SECRM_FL … #define EXT4_UNRM_FL … #define EXT4_COMPR_FL … #define EXT4_SYNC_FL … #define EXT4_IMMUTABLE_FL … #define EXT4_APPEND_FL … #define EXT4_NODUMP_FL … #define EXT4_NOATIME_FL … /* Reserved for compression usage... */ #define EXT4_DIRTY_FL … #define EXT4_COMPRBLK_FL … #define EXT4_NOCOMPR_FL … /* nb: was previously EXT2_ECOMPR_FL */ #define EXT4_ENCRYPT_FL … /* End compression flags --- maybe not all used */ #define EXT4_INDEX_FL … #define EXT4_IMAGIC_FL … #define EXT4_JOURNAL_DATA_FL … #define EXT4_NOTAIL_FL … #define EXT4_DIRSYNC_FL … #define EXT4_TOPDIR_FL … #define EXT4_HUGE_FILE_FL … #define EXT4_EXTENTS_FL … #define EXT4_VERITY_FL … #define EXT4_EA_INODE_FL … /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ #define EXT4_DAX_FL … #define EXT4_INLINE_DATA_FL … #define EXT4_PROJINHERIT_FL … #define EXT4_CASEFOLD_FL … #define EXT4_RESERVED_FL … /* User modifiable flags */ #define EXT4_FL_USER_MODIFIABLE … /* User visible flags */ #define EXT4_FL_USER_VISIBLE … /* Flags that should be inherited by new inodes from their parent. */ #define EXT4_FL_INHERITED … /* Flags that are appropriate for regular files (all but dir-specific ones). */ #define EXT4_REG_FLMASK … /* Flags that are appropriate for non-directories/regular files. */ #define EXT4_OTHER_FLMASK … /* The only flags that should be swapped */ #define EXT4_FL_SHOULD_SWAP … /* Flags which are mutually exclusive to DAX */ #define EXT4_DAX_MUT_EXCL … /* Mask out flags that are inappropriate for the given type of inode. */ static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) { … } /* * Inode flags used for atomic set/get */ enum { … }; /* * 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) … #define CHECK_FLAG_VALUE(FLAG) … static inline void ext4_check_flag_values(void) { … } #if defined(__KERNEL__) && defined(CONFIG_COMPAT) struct compat_ext4_new_group_input { … }; #endif /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ struct ext4_new_group_data { … }; /* Indexes used to index group tables in ext4_new_group_data */ enum { … }; /* * 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 … /* Request the creation of an unwritten extent */ #define EXT4_GET_BLOCKS_UNWRIT_EXT … #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT … /* Caller is from the delayed allocation writeout path * finally doing the actual allocation of delayed blocks */ #define EXT4_GET_BLOCKS_DELALLOC_RESERVE … /* 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 … #define EXT4_GET_BLOCKS_CONVERT … #define EXT4_GET_BLOCKS_IO_CREATE_EXT … /* Convert extent to initialized after IO complete */ #define EXT4_GET_BLOCKS_IO_CONVERT_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 … /* Don't normalize allocation size (used for fallocate) */ #define EXT4_GET_BLOCKS_NO_NORMALIZE … /* Convert written extents to unwritten */ #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN … /* Write zeros to newly created written extents */ #define EXT4_GET_BLOCKS_ZERO … #define EXT4_GET_BLOCKS_CREATE_ZERO … /* Caller will submit data before dropping transaction handle. This * allows jbd2 to avoid submitting data before commit. */ #define EXT4_GET_BLOCKS_IO_SUBMIT … /* Caller is in the atomic contex, find extent if it has been cached */ #define EXT4_GET_BLOCKS_CACHED_NOWAIT … /* * 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 … #define EXT4_EX_FORCE_CACHE … #define EXT4_EX_NOFAIL … /* * Flags used by ext4_free_blocks */ #define EXT4_FREE_BLOCKS_METADATA … #define EXT4_FREE_BLOCKS_FORGET … #define EXT4_FREE_BLOCKS_VALIDATED … #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE … #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER … #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER … #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER … #if defined(__KERNEL__) && defined(CONFIG_COMPAT) /* * ioctl commands in 32 bit emulation */ #define EXT4_IOC32_GETVERSION … #define EXT4_IOC32_SETVERSION … #define EXT4_IOC32_GETRSVSZ … #define EXT4_IOC32_SETRSVSZ … #define EXT4_IOC32_GROUP_EXTEND … #define EXT4_IOC32_GROUP_ADD … #define EXT4_IOC32_GETVERSION_OLD … #define EXT4_IOC32_SETVERSION_OLD … #endif /* Max physical block we can address w/o extents */ #define EXT4_MAX_BLOCK_FILE_PHYS … /* Max logical block we can support */ #define EXT4_MAX_LOGICAL_BLOCK … /* * Structure of an inode on the disk */ struct ext4_inode { … }; #define EXT4_EPOCH_BITS … #define EXT4_EPOCH_MASK … #define EXT4_NSEC_MASK … /* * 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) … \ /* * 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 ts) { … } static inline struct timespec64 ext4_decode_extra_time(__le32 base, __le32 extra) { … } #define EXT4_INODE_SET_XTIME_VAL(xtime, inode, raw_inode, ts) … #define EXT4_INODE_SET_ATIME(inode, raw_inode) … #define EXT4_INODE_SET_MTIME(inode, raw_inode) … #define EXT4_INODE_SET_CTIME(inode, raw_inode) … #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) … #define EXT4_INODE_GET_XTIME_VAL(xtime, inode, raw_inode) … #define EXT4_INODE_GET_ATIME(inode, raw_inode) … #define EXT4_INODE_GET_MTIME(inode, raw_inode) … #define EXT4_INODE_GET_CTIME(inode, raw_inode) … #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) … #define i_disk_version … #if defined(__KERNEL__) || defined(__linux__) #define i_reserved1 … #define i_file_acl_high … #define i_blocks_high … #define i_uid_low … #define i_gid_low … #define i_uid_high … #define i_gid_high … #define i_checksum_lo … #elif defined(__GNU__) #define i_translator … #define i_uid_high … #define i_gid_high … #define i_author … #elif defined(__masix__) #define i_reserved1 … #define i_file_acl_high … #define 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 * I_DATA_SEM_EA - Used for ea_inodes only */ enum { … }; /* * fourth extended file system inode data in memory */ struct ext4_inode_info { … }; /* * File system states */ #define EXT4_VALID_FS … #define EXT4_ERROR_FS … #define EXT4_ORPHAN_FS … #define EXT4_FC_REPLAY … /* * Misc. filesystem flags */ #define EXT2_FLAGS_SIGNED_HASH … #define EXT2_FLAGS_UNSIGNED_HASH … #define EXT2_FLAGS_TEST_FILESYS … /* * Mount flags set via mount options or defaults */ #define EXT4_MOUNT_NO_MBCACHE … #define EXT4_MOUNT_GRPID … #define EXT4_MOUNT_DEBUG … #define EXT4_MOUNT_ERRORS_CONT … #define EXT4_MOUNT_ERRORS_RO … #define EXT4_MOUNT_ERRORS_PANIC … #define EXT4_MOUNT_ERRORS_MASK … #define EXT4_MOUNT_MINIX_DF … #define EXT4_MOUNT_NOLOAD … #ifdef CONFIG_FS_DAX #define EXT4_MOUNT_DAX_ALWAYS … #else #define EXT4_MOUNT_DAX_ALWAYS … #endif #define EXT4_MOUNT_DATA_FLAGS … #define EXT4_MOUNT_JOURNAL_DATA … #define EXT4_MOUNT_ORDERED_DATA … #define EXT4_MOUNT_WRITEBACK_DATA … #define EXT4_MOUNT_UPDATE_JOURNAL … #define EXT4_MOUNT_NO_UID32 … #define EXT4_MOUNT_XATTR_USER … #define EXT4_MOUNT_POSIX_ACL … #define EXT4_MOUNT_NO_AUTO_DA_ALLOC … #define EXT4_MOUNT_BARRIER … #define EXT4_MOUNT_QUOTA … #define EXT4_MOUNT_USRQUOTA … #define EXT4_MOUNT_GRPQUOTA … #define EXT4_MOUNT_PRJQUOTA … #define EXT4_MOUNT_DIOREAD_NOLOCK … #define EXT4_MOUNT_JOURNAL_CHECKSUM … #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT … #define EXT4_MOUNT_WARN_ON_ERROR … #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS … #define EXT4_MOUNT_DELALLOC … #define EXT4_MOUNT_DATA_ERR_ABORT … #define EXT4_MOUNT_BLOCK_VALIDITY … #define EXT4_MOUNT_DISCARD … #define EXT4_MOUNT_INIT_INODE_TABLE … /* * 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 … #define EXT4_MOUNT2_STD_GROUP_SIZE … #define EXT4_MOUNT2_HURD_COMPAT … #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM … #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT … #define EXT4_MOUNT2_DAX_NEVER … #define EXT4_MOUNT2_DAX_INODE … #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN … #define EXT4_MOUNT2_ABORT … #define clear_opt(sb, opt) … #define set_opt(sb, opt) … #define test_opt(sb, opt) … #define clear_opt2(sb, opt) … #define set_opt2(sb, opt) … #define test_opt2(sb, opt) … #define ext4_test_and_set_bit … #define ext4_set_bit … #define ext4_test_and_clear_bit … #define ext4_clear_bit … #define ext4_test_bit … #define ext4_find_next_zero_bit … #define ext4_find_next_bit … extern void mb_set_bits(void *bm, int cur, int len); /* * Maximal mount counts between two filesystem checks */ #define EXT4_DFL_MAX_MNT_COUNT … #define EXT4_DFL_CHECKINTERVAL … /* * Behaviour when detecting errors */ #define EXT4_ERRORS_CONTINUE … #define EXT4_ERRORS_RO … #define EXT4_ERRORS_PANIC … #define EXT4_ERRORS_DEFAULT … /* Metadata checksum algorithm codes */ #define EXT4_CRC32C_CHKSUM … #define EXT4_LABEL_MAX … /* * Structure of the super block */ struct ext4_super_block { … }; #define EXT4_S_ERR_LEN … #ifdef __KERNEL__ /* Number of quota types we support */ #define EXT4_MAXQUOTAS … #define EXT4_ENC_UTF8_12_1 … /* Types of ext4 journal triggers */ enum ext4_journal_trigger_type { … }; #define EXT4_JOURNAL_TRIGGER_COUNT … struct ext4_journal_trigger { … }; static inline struct ext4_journal_trigger *EXT4_TRIGGER( struct jbd2_buffer_trigger_type *trigger) { … } #define EXT4_ORPHAN_BLOCK_MAGIC … /* Structure at the tail of orphan block */ struct ext4_orphan_block_tail { … }; static inline int ext4_inodes_per_orphan_block(struct super_block *sb) { … } struct ext4_orphan_block { … }; /* * Info about orphan file. */ struct ext4_orphan_info { … }; /* * fourth extended-fs super-block data in memory */ struct ext4_sb_info { … }; static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) { … } static inline struct ext4_inode_info *EXT4_I(struct inode *inode) { … } static inline int ext4_writepages_down_read(struct super_block *sb) { … } static inline void ext4_writepages_up_read(struct super_block *sb, int ctx) { … } static inline int ext4_writepages_down_write(struct super_block *sb) { … } static inline void ext4_writepages_up_write(struct super_block *sb, int ctx) { … } static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) { … } /* * 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) … /* * run-time mount flags */ enum { … }; static inline void ext4_set_mount_flag(struct super_block *sb, int bit) { … } static inline void ext4_clear_mount_flag(struct super_block *sb, int bit) { … } static inline int ext4_test_mount_flag(struct super_block *sb, int bit) { … } /* * Simulate_fail codes */ #define EXT4_SIM_BBITMAP_EIO … #define EXT4_SIM_BBITMAP_CRC … #define EXT4_SIM_IBITMAP_EIO … #define EXT4_SIM_IBITMAP_CRC … #define EXT4_SIM_INODE_EIO … #define EXT4_SIM_INODE_CRC … #define EXT4_SIM_DIRBLOCK_EIO … #define EXT4_SIM_DIRBLOCK_CRC … static inline bool ext4_simulate_fail(struct super_block *sb, unsigned long code) { … } static inline void ext4_simulate_fail_bh(struct super_block *sb, struct buffer_head *bh, unsigned long code) { … } /* * 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 … #define EXT4_ERR_EIO … #define EXT4_ERR_ENOMEM … #define EXT4_ERR_EFSBADCRC … #define EXT4_ERR_EFSCORRUPTED … #define EXT4_ERR_ENOSPC … #define EXT4_ERR_ENOKEY … #define EXT4_ERR_EROFS … #define EXT4_ERR_EFBIG … #define EXT4_ERR_EEXIST … #define EXT4_ERR_ERANGE … #define EXT4_ERR_EOVERFLOW … #define EXT4_ERR_EBUSY … #define EXT4_ERR_ENOTDIR … #define EXT4_ERR_ENOTEMPTY … #define EXT4_ERR_ESHUTDOWN … #define EXT4_ERR_EFAULT … /* * Inode dynamic state flags */ enum { … }; #define EXT4_INODE_BIT_FNS(name, field, offset) … /* 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(…) /* 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(…) static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) { … } #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 … #endif static inline bool ext4_verity_in_progress(struct inode *inode) { … } #define NEXT_ORPHAN(inode) … /* * Codes for operating systems */ #define EXT4_OS_LINUX … #define EXT4_OS_HURD … #define EXT4_OS_MASIX … #define EXT4_OS_FREEBSD … #define EXT4_OS_LITES … /* * Revision levels */ #define EXT4_GOOD_OLD_REV … #define EXT4_DYNAMIC_REV … #define EXT4_MAX_SUPP_REV … #define EXT4_GOOD_OLD_INODE_SIZE … #define EXT4_EXTRA_TIMESTAMP_MAX … #define EXT4_NON_EXTRA_TIMESTAMP_MAX … #define EXT4_TIMESTAMP_MIN … /* * Feature set definitions */ #define EXT4_FEATURE_COMPAT_DIR_PREALLOC … #define EXT4_FEATURE_COMPAT_IMAGIC_INODES … #define EXT4_FEATURE_COMPAT_HAS_JOURNAL … #define EXT4_FEATURE_COMPAT_EXT_ATTR … #define EXT4_FEATURE_COMPAT_RESIZE_INODE … #define EXT4_FEATURE_COMPAT_DIR_INDEX … #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 … /* * 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 … #define EXT4_FEATURE_COMPAT_STABLE_INODES … #define EXT4_FEATURE_COMPAT_ORPHAN_FILE … #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER … #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE … #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR … #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE … #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM … #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK … #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE … #define EXT4_FEATURE_RO_COMPAT_QUOTA … #define EXT4_FEATURE_RO_COMPAT_BIGALLOC … /* * 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 … #define EXT4_FEATURE_RO_COMPAT_READONLY … #define EXT4_FEATURE_RO_COMPAT_PROJECT … #define EXT4_FEATURE_RO_COMPAT_VERITY … #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT … #define EXT4_FEATURE_INCOMPAT_COMPRESSION … #define EXT4_FEATURE_INCOMPAT_FILETYPE … #define EXT4_FEATURE_INCOMPAT_RECOVER … #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV … #define EXT4_FEATURE_INCOMPAT_META_BG … #define EXT4_FEATURE_INCOMPAT_EXTENTS … #define EXT4_FEATURE_INCOMPAT_64BIT … #define EXT4_FEATURE_INCOMPAT_MMP … #define EXT4_FEATURE_INCOMPAT_FLEX_BG … #define EXT4_FEATURE_INCOMPAT_EA_INODE … #define EXT4_FEATURE_INCOMPAT_DIRDATA … #define EXT4_FEATURE_INCOMPAT_CSUM_SEED … #define EXT4_FEATURE_INCOMPAT_LARGEDIR … #define EXT4_FEATURE_INCOMPAT_INLINE_DATA … #define EXT4_FEATURE_INCOMPAT_ENCRYPT … #define EXT4_FEATURE_INCOMPAT_CASEFOLD … extern void ext4_update_dynamic_rev(struct super_block *sb); #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) … #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) … #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) … EXT4_FEATURE_COMPAT_FUNCS(…) EXT4_FEATURE_COMPAT_FUNCS(…) EXT4_FEATURE_COMPAT_FUNCS(…) EXT4_FEATURE_COMPAT_FUNCS(…) EXT4_FEATURE_COMPAT_FUNCS(…) EXT4_FEATURE_COMPAT_FUNCS(…) EXT4_FEATURE_COMPAT_FUNCS(…) EXT4_FEATURE_COMPAT_FUNCS(…) EXT4_FEATURE_COMPAT_FUNCS(…) EXT4_FEATURE_COMPAT_FUNCS(…) EXT4_FEATURE_RO_COMPAT_FUNCS(…) EXT4_FEATURE_RO_COMPAT_FUNCS(…) EXT4_FEATURE_RO_COMPAT_FUNCS(…) EXT4_FEATURE_RO_COMPAT_FUNCS(…) EXT4_FEATURE_RO_COMPAT_FUNCS(…) EXT4_FEATURE_RO_COMPAT_FUNCS(…) EXT4_FEATURE_RO_COMPAT_FUNCS(…) EXT4_FEATURE_RO_COMPAT_FUNCS(…) EXT4_FEATURE_RO_COMPAT_FUNCS(…) EXT4_FEATURE_RO_COMPAT_FUNCS(…) EXT4_FEATURE_RO_COMPAT_FUNCS(…) EXT4_FEATURE_RO_COMPAT_FUNCS(…) EXT4_FEATURE_RO_COMPAT_FUNCS(…) EXT4_FEATURE_RO_COMPAT_FUNCS(…) EXT4_FEATURE_INCOMPAT_FUNCS(…) EXT4_FEATURE_INCOMPAT_FUNCS(…) EXT4_FEATURE_INCOMPAT_FUNCS(…) EXT4_FEATURE_INCOMPAT_FUNCS(…) EXT4_FEATURE_INCOMPAT_FUNCS(…) EXT4_FEATURE_INCOMPAT_FUNCS(…) EXT4_FEATURE_INCOMPAT_FUNCS(…) EXT4_FEATURE_INCOMPAT_FUNCS(…) EXT4_FEATURE_INCOMPAT_FUNCS(…) EXT4_FEATURE_INCOMPAT_FUNCS(…) EXT4_FEATURE_INCOMPAT_FUNCS(…) EXT4_FEATURE_INCOMPAT_FUNCS(…) EXT4_FEATURE_INCOMPAT_FUNCS(…) EXT4_FEATURE_INCOMPAT_FUNCS(…) EXT4_FEATURE_INCOMPAT_FUNCS(…) EXT4_FEATURE_INCOMPAT_FUNCS(…) #define EXT2_FEATURE_COMPAT_SUPP … #define EXT2_FEATURE_INCOMPAT_SUPP … #define EXT2_FEATURE_RO_COMPAT_SUPP … #define EXT3_FEATURE_COMPAT_SUPP … #define EXT3_FEATURE_INCOMPAT_SUPP … #define EXT3_FEATURE_RO_COMPAT_SUPP … #define EXT4_FEATURE_COMPAT_SUPP … #define EXT4_FEATURE_INCOMPAT_SUPP … #define EXT4_FEATURE_RO_COMPAT_SUPP … #define EXTN_FEATURE_FUNCS(ver) … EXTN_FEATURE_FUNCS(…) EXTN_FEATURE_FUNCS(…) EXTN_FEATURE_FUNCS(…) static inline bool ext4_has_compat_features(struct super_block *sb) { … } static inline bool ext4_has_ro_compat_features(struct super_block *sb) { … } static inline bool ext4_has_incompat_features(struct super_block *sb) { … } extern int ext4_feature_set_ok(struct super_block *sb, int readonly); /* * Superblock flags */ #define EXT4_FLAGS_RESIZING … #define EXT4_FLAGS_SHUTDOWN … #define EXT4_FLAGS_BDEV_IS_DAX … static inline int ext4_forced_shutdown(struct super_block *sb) { … } /* * Default values for user and/or group using reserved blocks */ #define EXT4_DEF_RESUID … #define EXT4_DEF_RESGID … /* * Default project ID */ #define EXT4_DEF_PROJID … #define EXT4_DEF_INODE_READAHEAD_BLKS … /* * Default mount options */ #define EXT4_DEFM_DEBUG … #define EXT4_DEFM_BSDGROUPS … #define EXT4_DEFM_XATTR_USER … #define EXT4_DEFM_ACL … #define EXT4_DEFM_UID16 … #define EXT4_DEFM_JMODE … #define EXT4_DEFM_JMODE_DATA … #define EXT4_DEFM_JMODE_ORDERED … #define EXT4_DEFM_JMODE_WBACK … #define EXT4_DEFM_NOBARRIER … #define EXT4_DEFM_BLOCK_VALIDITY … #define EXT4_DEFM_DISCARD … #define EXT4_DEFM_NODELALLOC … /* * Default journal batch times */ #define EXT4_DEF_MIN_BATCH_TIME … #define EXT4_DEF_MAX_BATCH_TIME … /* * 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 … /* * Structure of a directory entry */ #define EXT4_NAME_LEN … /* * Base length of the ext4 directory entry excluding the name length */ #define EXT4_BASE_DIR_LEN … struct ext4_dir_entry { … }; /* * 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 { … }; /* * 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 { … }; /* * Access the hashes at the end of ext4_dir_entry_2 */ #define EXT4_DIRENT_HASHES(entry) … #define EXT4_DIRENT_HASH(entry) … #define EXT4_DIRENT_MINOR_HASH(entry) … static inline bool ext4_hash_in_dirent(const struct inode *inode) { … } /* * This is a bogus directory entry at the end of each leaf block that * records checksums. */ struct ext4_dir_entry_tail { … }; #define EXT4_DIRENT_TAIL(block, blocksize) … /* * Ext4 directory file types. Only the low 3 bits are used. The * other bits are reserved for now. */ #define EXT4_FT_UNKNOWN … #define EXT4_FT_REG_FILE … #define EXT4_FT_DIR … #define EXT4_FT_CHRDEV … #define EXT4_FT_BLKDEV … #define EXT4_FT_FIFO … #define EXT4_FT_SOCK … #define EXT4_FT_SYMLINK … #define EXT4_FT_MAX … #define EXT4_FT_DIR_CSUM … /* * EXT4_DIR_PAD defines the directory entries boundaries * * NOTE: It must be a multiple of 4 */ #define EXT4_DIR_PAD … #define EXT4_DIR_ROUND … #define EXT4_MAX_REC_LEN … /* * 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) { … } /* * 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) { … } static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) { … } /* * Hash Tree Directory indexing * (c) Daniel Phillips, 2001 */ #define is_dx(dir) … #define EXT4_DIR_LINK_MAX(dir) … #define EXT4_DIR_LINK_EMPTY(dir) … /* Legal values for the dx_root hash_version field: */ #define DX_HASH_LEGACY … #define DX_HASH_HALF_MD4 … #define DX_HASH_TEA … #define DX_HASH_LEGACY_UNSIGNED … #define DX_HASH_HALF_MD4_UNSIGNED … #define DX_HASH_TEA_UNSIGNED … #define DX_HASH_SIPHASH … static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, const void *address, unsigned int length) { … } #ifdef __KERNEL__ /* hash info structure used by the directory hash */ struct dx_hash_info { … }; /* 32 and 64 bit signed EOF for dx directories */ #define EXT4_HTREE_EOF_32BIT … #define EXT4_HTREE_EOF_64BIT … /* * Control parameters used by ext4_htree_next_block */ #define HASH_NB_ALWAYS … struct ext4_filename { … }; #define fname_name(p) … #define fname_usr_name(p) … #define fname_len(p) … /* * Describe an inode's exact location on disk and in memory */ struct ext4_iloc { … }; static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) { … } static inline bool ext4_is_quota_file(struct inode *inode) { … } /* * 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 { … }; /* 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) { … } /* * Special error return code only used by dx_probe() and its callers. */ #define ERR_BAD_DX_DIR … /* htree levels for ext4 */ #define EXT4_HTREE_LEVEL_COMPAT … #define EXT4_HTREE_LEVEL … static inline int ext4_dir_htree_level(struct super_block *sb) { … } /* * Timeout and state flag for lazy initialization inode thread. */ #define EXT4_DEF_LI_WAIT_MULT … #define EXT4_DEF_LI_MAX_START_DELAY … #define EXT4_LAZYINIT_QUIT … #define EXT4_LAZYINIT_RUNNING … /* * Lazy inode table initialization info */ struct ext4_lazy_init { … }; enum ext4_li_mode { … }; struct ext4_li_request { … }; struct ext4_features { … }; /* * 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 … #define EXT4_MMP_SEQ_CLEAN … #define EXT4_MMP_SEQ_FSCK … #define EXT4_MMP_SEQ_MAX … struct mmp_struct { … }; /* arguments passed to the mmp thread */ struct mmpd_data { … }; /* * 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 … /* * Minimum interval for MMP checking in seconds. */ #define EXT4_MMP_MIN_CHECK_INTERVAL … /* * Maximum interval for MMP checking in seconds. */ #define EXT4_MMP_MAX_CHECK_INTERVAL … /* * 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 … #define NORET_AND … /* bitmap.c */ extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); void ext4_inode_bitmap_csum_set(struct super_block *sb, struct ext4_group_desc *gdp, struct buffer_head *bh, int sz); int ext4_inode_bitmap_csum_verify(struct super_block *sb, struct ext4_group_desc *gdp, struct buffer_head *bh, int sz); void ext4_block_bitmap_csum_set(struct super_block *sb, struct ext4_group_desc *gdp, struct buffer_head *bh); int ext4_block_bitmap_csum_verify(struct super_block *sb, 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 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 struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, ext4_group_t block_group, struct buffer_head ** bh); extern struct ext4_group_info *ext4_get_group_info(struct super_block *sb, ext4_group_t group); 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); static inline void ext4_fname_free_ci_filename(struct ext4_filename *fname) { … } #else static inline int ext4_fname_setup_ci_filename(struct inode *dir, const struct qstr *iname, struct ext4_filename *fname) { return 0; } static inline void ext4_fname_free_ci_filename(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) { fname->usr_fname = iname; fname->disk_name.name = (unsigned char *) iname->name; fname->disk_name.len = iname->len; return ext4_fname_setup_ci_filename(dir, iname, fname); } 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) { ext4_fname_free_ci_filename(fname); } 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) … 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) { … } static const unsigned char ext4_filetype_table[] = …; static inline unsigned char get_dtype(struct super_block *sb, int 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 mnt_idmap *, 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) … #define ext4_new_inode_start_handle(idmap, dir, mode, qstr, goal, owner, \ type, 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_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 int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset); extern int ext4_mb_init(struct super_block *); extern void ext4_mb_release(struct super_block *); extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, struct ext4_allocation_request *, int *); extern void ext4_discard_preallocations(struct inode *); 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, bool state); static inline bool ext4_mb_cr_expensive(enum criteria cr) { … } /* 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 … #define CONVERT_INLINE_DATA … 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) … extern int ext4_write_inode(struct inode *, struct writeback_control *); extern int ext4_setattr(struct mnt_idmap *, struct dentry *, struct iattr *); extern u32 ext4_dio_alignment(struct inode *inode); extern int ext4_getattr(struct mnt_idmap *, 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 mnt_idmap *, const struct path *, struct kstat *, u32, unsigned int); 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_normal_submit_inode_data_buffers(struct jbd2_inode *jinode); 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 mnt_idmap *idmap, 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); int ext4_force_shutdown(struct super_block *sb, u32 flags); /* 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 unsigned int ext4_num_base_meta_blocks(struct super_block *sb, ext4_group_t block_group); 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...) … #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) … #define ext4_error_inode_block(inode, block, err, fmt, a...) … #define EXT4_ERROR_FILE(file, block, fmt, a...) … #define ext4_abort(sb, err, fmt, a...) … #ifdef CONFIG_PRINTK #define ext4_error_inode(inode, func, line, block, fmt, ...) … #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) … #define ext4_error_file(file, func, line, block, fmt, ...) … #define ext4_error(sb, fmt, ...) … #define ext4_error_err(sb, err, fmt, ...) … #define ext4_warning(sb, fmt, ...) … #define ext4_warning_inode(inode, fmt, ...) … #define ext4_msg(sb, level, fmt, ...) … #define dump_mmp_msg(sb, mmp, msg) … #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) … #else #define ext4_error_inode … #define ext4_error_inode_err … #define ext4_error_file … #define ext4_error … #define ext4_error_err … #define ext4_warning … #define ext4_warning_inode … #define ext4_msg … #define dump_mmp_msg … #define ext4_grp_locked_error … #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) { … } static inline int ext4_has_group_desc_csum(struct super_block *sb) { … } #define ext4_read_incompat_64bit_val(es, name) … static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) { … } static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) { … } static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) { … } static inline void ext4_blocks_count_set(struct ext4_super_block *es, ext4_fsblk_t blk) { … } static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, ext4_fsblk_t blk) { … } static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, ext4_fsblk_t blk) { … } static inline loff_t ext4_isize(struct super_block *sb, struct ext4_inode *raw_inode) { … } static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) { … } /* * 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) { … } static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, ext4_group_t block_group) { … } static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) { … } #define ext4_std_error(sb, errno) … #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 … #else #define EXT4_FREECLUSTERS_WATERMARK … #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) { … } /* 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 ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, loff_t len); struct ext4_group_info { … }; #define EXT4_GROUP_INFO_NEED_INIT_BIT … #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT … #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT … #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT … #define EXT4_GROUP_INFO_BBITMAP_CORRUPT … #define EXT4_GROUP_INFO_IBITMAP_CORRUPT … #define EXT4_GROUP_INFO_BBITMAP_READ_BIT … #define EXT4_MB_GRP_NEED_INIT(grp) … #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) … #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) … #define EXT4_MB_GRP_WAS_TRIMMED(grp) … #define EXT4_MB_GRP_SET_TRIMMED(grp) … #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) … #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) … #define EXT4_MAX_CONTENTION … #define EXT4_CONTENTION_THRESHOLD … static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, ext4_group_t 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) { … } static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) { … } static inline void ext4_unlock_group(struct super_block *sb, ext4_group_t group) { … } #ifdef CONFIG_QUOTA static inline bool ext4_quota_capable(struct super_block *sb) { … } static inline bool ext4_is_quota_journalled(struct super_block *sb) { … } int ext4_enable_quotas(struct super_block *sb); #endif /* * Block validity checking */ #define ext4_check_indirect_blockref(inode, bh) … #define ext4_ind_check_inode(inode) … /* * 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_destroy_inline_data(handle_t *handle, struct inode *inode); int ext4_readpage_inline(struct inode *inode, struct folio *folio); extern int ext4_try_to_write_inline_data(struct address_space *mapping, struct inode *inode, loff_t pos, unsigned len, struct page **pagep); int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, unsigned copied, struct folio *folio); 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) { … } /* 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(struct inode *dir, const struct qstr *d_name, struct inode *inode, struct dentry *dentry); extern int __ext4_link(struct inode *dir, struct inode *inode, struct dentry *dentry); #define S_SHIFT … static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = …; static inline void ext4_set_de_type(struct super_block *sb, struct ext4_dir_entry_2 *de, umode_t mode) { … } /* readpages.c */ extern int ext4_mpage_readpages(struct inode *inode, struct readahead_control *rac, struct folio *folio); 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 … 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); int ext4_bio_write_folio(struct ext4_io_submit *io, struct folio *page, size_t len); 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 … static inline int bitmap_uptodate(struct buffer_head *bh) { … } static inline void set_bitmap_uptodate(struct buffer_head *bh) { … } /* For ioend & aio unwritten conversion wait queues */ #define EXT4_WQ_HASH_SZ … #define ext4_ioend_wq(v) … 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) { … } static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) { … } 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) { … } #endif /* __KERNEL__ */ #define EFSBADCRC … #define EFSCORRUPTED … #endif /* _EXT4_H */
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