brintos / linux-shallow public Read only

1// SPDX-License-Identifier: GPL-2.02/*3 *  ext4.h4 *5 * Copyright (C) 1992, 1993, 1994, 19956 * Remy Card (card@masi.ibp.fr)7 * Laboratoire MASI - Institut Blaise Pascal8 * Universite Pierre et Marie Curie (Paris VI)9 *10 *  from11 *12 *  linux/include/linux/minix_fs.h13 *14 *  Copyright (C) 1991, 1992  Linus Torvalds15 */16 17#ifndef _EXT4_H18#define _EXT4_H19 20#include <linux/refcount.h>21#include <linux/types.h>22#include <linux/blkdev.h>23#include <linux/magic.h>24#include <linux/jbd2.h>25#include <linux/quota.h>26#include <linux/rwsem.h>27#include <linux/rbtree.h>28#include <linux/seqlock.h>29#include <linux/mutex.h>30#include <linux/timer.h>31#include <linux/wait.h>32#include <linux/sched/signal.h>33#include <linux/blockgroup_lock.h>34#include <linux/percpu_counter.h>35#include <linux/ratelimit.h>36#include <crypto/hash.h>37#include <linux/falloc.h>38#include <linux/percpu-rwsem.h>39#include <linux/fiemap.h>40#ifdef __KERNEL__41#include <linux/compat.h>42#endif43#include <uapi/linux/ext4.h>44 45#include <linux/fscrypt.h>46#include <linux/fsverity.h>47 48#include <linux/compiler.h>49 50/*51 * The fourth extended filesystem constants/structures52 */53 54/*55 * with AGGRESSIVE_CHECK allocator runs consistency checks over56 * structures. these checks slow things down a lot57 */58#define AGGRESSIVE_CHECK__59 60/*61 * with DOUBLE_CHECK defined mballoc creates persistent in-core62 * bitmaps, maintains and uses them to check for double allocations63 */64#define DOUBLE_CHECK__65 66/*67 * Define EXT4FS_DEBUG to produce debug messages68 */69#undef EXT4FS_DEBUG70 71/*72 * Debug code73 */74#ifdef EXT4FS_DEBUG75#define ext4_debug(f, a...)						\76	do {								\77		printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",	\78			__FILE__, __LINE__, __func__);			\79		printk(KERN_DEBUG f, ## a);				\80	} while (0)81#else82#define ext4_debug(fmt, ...)	no_printk(fmt, ##__VA_ARGS__)83#endif84 85 /*86  * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c87  */88#define EXT_DEBUG__89 90/*91 * Dynamic printk for controlled extents debugging.92 */93#ifdef CONFIG_EXT4_DEBUG94#define ext_debug(ino, fmt, ...)					\95	pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt,	\96		 current->comm, task_pid_nr(current),			\97		 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__,	\98		 __func__, ##__VA_ARGS__)99#else100#define ext_debug(ino, fmt, ...)	no_printk(fmt, ##__VA_ARGS__)101#endif102 103#define ASSERT(assert)						\104do {									\105	if (unlikely(!(assert))) {					\106		printk(KERN_EMERG					\107		       "Assertion failure in %s() at %s:%d: '%s'\n",	\108		       __func__, __FILE__, __LINE__, #assert);		\109		BUG();							\110	}								\111} while (0)112 113/* data type for block offset of block group */114typedef int ext4_grpblk_t;115 116/* data type for filesystem-wide blocks number */117typedef unsigned long long ext4_fsblk_t;118 119/* data type for file logical block number */120typedef __u32 ext4_lblk_t;121 122/* data type for block group number */123typedef unsigned int ext4_group_t;124 125enum SHIFT_DIRECTION {126	SHIFT_LEFT = 0,127	SHIFT_RIGHT,128};129 130/*131 * For each criteria, mballoc has slightly different way of finding132 * the required blocks nad usually, higher the criteria the slower the133 * allocation.  We start at lower criterias and keep falling back to134 * higher ones if we are not able to find any blocks.  Lower (earlier)135 * criteria are faster.136 */137enum criteria {138	/*139	 * Used when number of blocks needed is a power of 2. This140	 * doesn't trigger any disk IO except prefetch and is the141	 * fastest criteria.142	 */143	CR_POWER2_ALIGNED,144 145	/*146	 * Tries to lookup in-memory data structures to find the most147	 * suitable group that satisfies goal request. No disk IO148	 * except block prefetch.149	 */150	CR_GOAL_LEN_FAST,151 152        /*153	 * Same as CR_GOAL_LEN_FAST but is allowed to reduce the goal154         * length to the best available length for faster allocation.155	 */156	CR_BEST_AVAIL_LEN,157 158	/*159	 * Reads each block group sequentially, performing disk IO if160	 * necessary, to find find_suitable block group. Tries to161	 * allocate goal length but might trim the request if nothing162	 * is found after enough tries.163	 */164	CR_GOAL_LEN_SLOW,165 166	/*167	 * Finds the first free set of blocks and allocates168	 * those. This is only used in rare cases when169	 * CR_GOAL_LEN_SLOW also fails to allocate anything.170	 */171	CR_ANY_FREE,172 173	/*174	 * Number of criterias defined.175	 */176	EXT4_MB_NUM_CRS177};178 179/*180 * Flags used in mballoc's allocation_context flags field.181 *182 * Also used to show what's going on for debugging purposes when the183 * flag field is exported via the traceport interface184 */185 186/* prefer goal again. length */187#define EXT4_MB_HINT_MERGE		0x0001188/* blocks already reserved */189#define EXT4_MB_HINT_RESERVED		0x0002190/* metadata is being allocated */191#define EXT4_MB_HINT_METADATA		0x0004192/* first blocks in the file */193#define EXT4_MB_HINT_FIRST		0x0008194/* search for the best chunk */195#define EXT4_MB_HINT_BEST		0x0010196/* data is being allocated */197#define EXT4_MB_HINT_DATA		0x0020198/* don't preallocate (for tails) */199#define EXT4_MB_HINT_NOPREALLOC		0x0040200/* allocate for locality group */201#define EXT4_MB_HINT_GROUP_ALLOC	0x0080202/* allocate goal blocks or none */203#define EXT4_MB_HINT_GOAL_ONLY		0x0100204/* goal is meaningful */205#define EXT4_MB_HINT_TRY_GOAL		0x0200206/* blocks already pre-reserved by delayed allocation */207#define EXT4_MB_DELALLOC_RESERVED	0x0400208/* We are doing stream allocation */209#define EXT4_MB_STREAM_ALLOC		0x0800210/* Use reserved root blocks if needed */211#define EXT4_MB_USE_ROOT_BLOCKS		0x1000212/* Use blocks from reserved pool */213#define EXT4_MB_USE_RESERVED		0x2000214/* Do strict check for free blocks while retrying block allocation */215#define EXT4_MB_STRICT_CHECK		0x4000216/* Large fragment size list lookup succeeded at least once for217 * CR_POWER2_ALIGNED */218#define EXT4_MB_CR_POWER2_ALIGNED_OPTIMIZED		0x8000219/* Avg fragment size rb tree lookup succeeded at least once for220 * CR_GOAL_LEN_FAST */221#define EXT4_MB_CR_GOAL_LEN_FAST_OPTIMIZED		0x00010000222/* Avg fragment size rb tree lookup succeeded at least once for223 * CR_BEST_AVAIL_LEN */224#define EXT4_MB_CR_BEST_AVAIL_LEN_OPTIMIZED		0x00020000225 226struct ext4_allocation_request {227	/* target inode for block we're allocating */228	struct inode *inode;229	/* how many blocks we want to allocate */230	unsigned int len;231	/* logical block in target inode */232	ext4_lblk_t logical;233	/* the closest logical allocated block to the left */234	ext4_lblk_t lleft;235	/* the closest logical allocated block to the right */236	ext4_lblk_t lright;237	/* phys. target (a hint) */238	ext4_fsblk_t goal;239	/* phys. block for the closest logical allocated block to the left */240	ext4_fsblk_t pleft;241	/* phys. block for the closest logical allocated block to the right */242	ext4_fsblk_t pright;243	/* flags. see above EXT4_MB_HINT_* */244	unsigned int flags;245};246 247/*248 * Logical to physical block mapping, used by ext4_map_blocks()249 *250 * This structure is used to pass requests into ext4_map_blocks() as251 * well as to store the information returned by ext4_map_blocks().  It252 * takes less room on the stack than a struct buffer_head.253 */254#define EXT4_MAP_NEW		BIT(BH_New)255#define EXT4_MAP_MAPPED		BIT(BH_Mapped)256#define EXT4_MAP_UNWRITTEN	BIT(BH_Unwritten)257#define EXT4_MAP_BOUNDARY	BIT(BH_Boundary)258#define EXT4_MAP_DELAYED	BIT(BH_Delay)259#define EXT4_MAP_FLAGS		(EXT4_MAP_NEW | EXT4_MAP_MAPPED |\260				 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\261				 EXT4_MAP_DELAYED)262 263struct ext4_map_blocks {264	ext4_fsblk_t m_pblk;265	ext4_lblk_t m_lblk;266	unsigned int m_len;267	unsigned int m_flags;268};269 270/*271 * Block validity checking, system zone rbtree.272 */273struct ext4_system_blocks {274	struct rb_root root;275	struct rcu_head rcu;276};277 278/*279 * Flags for ext4_io_end->flags280 */281#define	EXT4_IO_END_UNWRITTEN	0x0001282 283struct ext4_io_end_vec {284	struct list_head list;		/* list of io_end_vec */285	loff_t offset;			/* offset in the file */286	ssize_t size;			/* size of the extent */287};288 289/*290 * For converting unwritten extents on a work queue. 'handle' is used for291 * buffered writeback.292 */293typedef struct ext4_io_end {294	struct list_head	list;		/* per-file finished IO list */295	handle_t		*handle;	/* handle reserved for extent296						 * conversion */297	struct inode		*inode;		/* file being written to */298	struct bio		*bio;		/* Linked list of completed299						 * bios covering the extent */300	unsigned int		flag;		/* unwritten or not */301	refcount_t		count;		/* reference counter */302	struct list_head	list_vec;	/* list of ext4_io_end_vec */303} ext4_io_end_t;304 305struct ext4_io_submit {306	struct writeback_control *io_wbc;307	struct bio		*io_bio;308	ext4_io_end_t		*io_end;309	sector_t		io_next_block;310};311 312/*313 * Special inodes numbers314 */315#define	EXT4_BAD_INO		 1	/* Bad blocks inode */316#define EXT4_ROOT_INO		 2	/* Root inode */317#define EXT4_USR_QUOTA_INO	 3	/* User quota inode */318#define EXT4_GRP_QUOTA_INO	 4	/* Group quota inode */319#define EXT4_BOOT_LOADER_INO	 5	/* Boot loader inode */320#define EXT4_UNDEL_DIR_INO	 6	/* Undelete directory inode */321#define EXT4_RESIZE_INO		 7	/* Reserved group descriptors inode */322#define EXT4_JOURNAL_INO	 8	/* Journal inode */323 324/* First non-reserved inode for old ext4 filesystems */325#define EXT4_GOOD_OLD_FIRST_INO	11326 327/*328 * Maximal count of links to a file329 */330#define EXT4_LINK_MAX		65000331 332/*333 * Macro-instructions used to manage several block sizes334 */335#define EXT4_MIN_BLOCK_SIZE		1024336#define	EXT4_MAX_BLOCK_SIZE		65536337#define EXT4_MIN_BLOCK_LOG_SIZE		10338#define EXT4_MAX_BLOCK_LOG_SIZE		16339#define EXT4_MAX_CLUSTER_LOG_SIZE	30340#ifdef __KERNEL__341# define EXT4_BLOCK_SIZE(s)		((s)->s_blocksize)342#else343# define EXT4_BLOCK_SIZE(s)		(EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)344#endif345#define	EXT4_ADDR_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / sizeof(__u32))346#define EXT4_CLUSTER_SIZE(s)		(EXT4_BLOCK_SIZE(s) << \347					 EXT4_SB(s)->s_cluster_bits)348#ifdef __KERNEL__349# define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_blocksize_bits)350# define EXT4_CLUSTER_BITS(s)		(EXT4_SB(s)->s_cluster_bits)351#else352# define EXT4_BLOCK_SIZE_BITS(s)	((s)->s_log_block_size + 10)353#endif354#ifdef __KERNEL__355#define	EXT4_ADDR_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_addr_per_block_bits)356#define EXT4_INODE_SIZE(s)		(EXT4_SB(s)->s_inode_size)357#define EXT4_FIRST_INO(s)		(EXT4_SB(s)->s_first_ino)358#else359#define EXT4_INODE_SIZE(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \360				 EXT4_GOOD_OLD_INODE_SIZE : \361				 (s)->s_inode_size)362#define EXT4_FIRST_INO(s)	(((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \363				 EXT4_GOOD_OLD_FIRST_INO : \364				 (s)->s_first_ino)365#endif366#define EXT4_BLOCK_ALIGN(size, blkbits)		ALIGN((size), (1 << (blkbits)))367#define EXT4_MAX_BLOCKS(size, offset, blkbits) \368	((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \369								  blkbits))370 371/* Translate a block number to a cluster number */372#define EXT4_B2C(sbi, blk)	((blk) >> (sbi)->s_cluster_bits)373/* Translate a cluster number to a block number */374#define EXT4_C2B(sbi, cluster)	((cluster) << (sbi)->s_cluster_bits)375/* Translate # of blks to # of clusters */376#define EXT4_NUM_B2C(sbi, blks)	(((blks) + (sbi)->s_cluster_ratio - 1) >> \377				 (sbi)->s_cluster_bits)378/* Mask out the low bits to get the starting block of the cluster */379#define EXT4_PBLK_CMASK(s, pblk) ((pblk) &				\380				  ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))381#define EXT4_LBLK_CMASK(s, lblk) ((lblk) &				\382				  ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))383/* Fill in the low bits to get the last block of the cluster */384#define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) |				\385				    ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))386/* Get the cluster offset */387#define EXT4_PBLK_COFF(s, pblk) ((pblk) &				\388				 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))389#define EXT4_LBLK_COFF(s, lblk) ((lblk) &				\390				 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))391 392/*393 * Structure of a blocks group descriptor394 */395struct ext4_group_desc396{397	__le32	bg_block_bitmap_lo;	/* Blocks bitmap block */398	__le32	bg_inode_bitmap_lo;	/* Inodes bitmap block */399	__le32	bg_inode_table_lo;	/* Inodes table block */400	__le16	bg_free_blocks_count_lo;/* Free blocks count */401	__le16	bg_free_inodes_count_lo;/* Free inodes count */402	__le16	bg_used_dirs_count_lo;	/* Directories count */403	__le16	bg_flags;		/* EXT4_BG_flags (INODE_UNINIT, etc) */404	__le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */405	__le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */406	__le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */407	__le16  bg_itable_unused_lo;	/* Unused inodes count */408	__le16  bg_checksum;		/* crc16(sb_uuid+group+desc) */409	__le32	bg_block_bitmap_hi;	/* Blocks bitmap block MSB */410	__le32	bg_inode_bitmap_hi;	/* Inodes bitmap block MSB */411	__le32	bg_inode_table_hi;	/* Inodes table block MSB */412	__le16	bg_free_blocks_count_hi;/* Free blocks count MSB */413	__le16	bg_free_inodes_count_hi;/* Free inodes count MSB */414	__le16	bg_used_dirs_count_hi;	/* Directories count MSB */415	__le16  bg_itable_unused_hi;    /* Unused inodes count MSB */416	__le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */417	__le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */418	__le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */419	__u32   bg_reserved;420};421 422#define EXT4_BG_INODE_BITMAP_CSUM_HI_END	\423	(offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \424	 sizeof(__le16))425#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END	\426	(offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \427	 sizeof(__le16))428 429/*430 * Structure of a flex block group info431 */432 433struct flex_groups {434	atomic64_t	free_clusters;435	atomic_t	free_inodes;436	atomic_t	used_dirs;437};438 439#define EXT4_BG_INODE_UNINIT	0x0001 /* Inode table/bitmap not in use */440#define EXT4_BG_BLOCK_UNINIT	0x0002 /* Block bitmap not in use */441#define EXT4_BG_INODE_ZEROED	0x0004 /* On-disk itable initialized to zero */442 443/*444 * Macro-instructions used to manage group descriptors445 */446#define EXT4_MIN_DESC_SIZE		32447#define EXT4_MIN_DESC_SIZE_64BIT	64448#define	EXT4_MAX_DESC_SIZE		EXT4_MIN_BLOCK_SIZE449#define EXT4_DESC_SIZE(s)		(EXT4_SB(s)->s_desc_size)450#ifdef __KERNEL__451# define EXT4_BLOCKS_PER_GROUP(s)	(EXT4_SB(s)->s_blocks_per_group)452# define EXT4_CLUSTERS_PER_GROUP(s)	(EXT4_SB(s)->s_clusters_per_group)453# define EXT4_DESC_PER_BLOCK(s)		(EXT4_SB(s)->s_desc_per_block)454# define EXT4_INODES_PER_GROUP(s)	(EXT4_SB(s)->s_inodes_per_group)455# define EXT4_DESC_PER_BLOCK_BITS(s)	(EXT4_SB(s)->s_desc_per_block_bits)456#else457# define EXT4_BLOCKS_PER_GROUP(s)	((s)->s_blocks_per_group)458# define EXT4_DESC_PER_BLOCK(s)		(EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))459# define EXT4_INODES_PER_GROUP(s)	((s)->s_inodes_per_group)460#endif461 462/*463 * Constants relative to the data blocks464 */465#define	EXT4_NDIR_BLOCKS		12466#define	EXT4_IND_BLOCK			EXT4_NDIR_BLOCKS467#define	EXT4_DIND_BLOCK			(EXT4_IND_BLOCK + 1)468#define	EXT4_TIND_BLOCK			(EXT4_DIND_BLOCK + 1)469#define	EXT4_N_BLOCKS			(EXT4_TIND_BLOCK + 1)470 471/*472 * Inode flags473 */474#define	EXT4_SECRM_FL			0x00000001 /* Secure deletion */475#define	EXT4_UNRM_FL			0x00000002 /* Undelete */476#define	EXT4_COMPR_FL			0x00000004 /* Compress file */477#define EXT4_SYNC_FL			0x00000008 /* Synchronous updates */478#define EXT4_IMMUTABLE_FL		0x00000010 /* Immutable file */479#define EXT4_APPEND_FL			0x00000020 /* writes to file may only append */480#define EXT4_NODUMP_FL			0x00000040 /* do not dump file */481#define EXT4_NOATIME_FL			0x00000080 /* do not update atime */482/* Reserved for compression usage... */483#define EXT4_DIRTY_FL			0x00000100484#define EXT4_COMPRBLK_FL		0x00000200 /* One or more compressed clusters */485#define EXT4_NOCOMPR_FL			0x00000400 /* Don't compress */486	/* nb: was previously EXT2_ECOMPR_FL */487#define EXT4_ENCRYPT_FL			0x00000800 /* encrypted file */488/* End compression flags --- maybe not all used */489#define EXT4_INDEX_FL			0x00001000 /* hash-indexed directory */490#define EXT4_IMAGIC_FL			0x00002000 /* AFS directory */491#define EXT4_JOURNAL_DATA_FL		0x00004000 /* file data should be journaled */492#define EXT4_NOTAIL_FL			0x00008000 /* file tail should not be merged */493#define EXT4_DIRSYNC_FL			0x00010000 /* dirsync behaviour (directories only) */494#define EXT4_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/495#define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */496#define EXT4_EXTENTS_FL			0x00080000 /* Inode uses extents */497#define EXT4_VERITY_FL			0x00100000 /* Verity protected inode */498#define EXT4_EA_INODE_FL	        0x00200000 /* Inode used for large EA */499/* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */500 501#define EXT4_DAX_FL			0x02000000 /* Inode is DAX */502 503#define EXT4_INLINE_DATA_FL		0x10000000 /* Inode has inline data. */504#define EXT4_PROJINHERIT_FL		0x20000000 /* Create with parents projid */505#define EXT4_CASEFOLD_FL		0x40000000 /* Casefolded directory */506#define EXT4_RESERVED_FL		0x80000000 /* reserved for ext4 lib */507 508/* User modifiable flags */509#define EXT4_FL_USER_MODIFIABLE		(EXT4_SECRM_FL | \510					 EXT4_UNRM_FL | \511					 EXT4_COMPR_FL | \512					 EXT4_SYNC_FL | \513					 EXT4_IMMUTABLE_FL | \514					 EXT4_APPEND_FL | \515					 EXT4_NODUMP_FL | \516					 EXT4_NOATIME_FL | \517					 EXT4_JOURNAL_DATA_FL | \518					 EXT4_NOTAIL_FL | \519					 EXT4_DIRSYNC_FL | \520					 EXT4_TOPDIR_FL | \521					 EXT4_EXTENTS_FL | \522					 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \523					 EXT4_DAX_FL | \524					 EXT4_PROJINHERIT_FL | \525					 EXT4_CASEFOLD_FL)526 527/* User visible flags */528#define EXT4_FL_USER_VISIBLE		(EXT4_FL_USER_MODIFIABLE | \529					 EXT4_DIRTY_FL | \530					 EXT4_COMPRBLK_FL | \531					 EXT4_NOCOMPR_FL | \532					 EXT4_ENCRYPT_FL | \533					 EXT4_INDEX_FL | \534					 EXT4_VERITY_FL | \535					 EXT4_INLINE_DATA_FL)536 537/* Flags that should be inherited by new inodes from their parent. */538#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\539			   EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\540			   EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\541			   EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\542			   EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\543			   EXT4_DAX_FL)544 545/* Flags that are appropriate for regular files (all but dir-specific ones). */546#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\547			   EXT4_PROJINHERIT_FL))548 549/* Flags that are appropriate for non-directories/regular files. */550#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)551 552/* The only flags that should be swapped */553#define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)554 555/* Flags which are mutually exclusive to DAX */556#define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\557			   EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)558 559/* Mask out flags that are inappropriate for the given type of inode. */560static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)561{562	if (S_ISDIR(mode))563		return flags;564	else if (S_ISREG(mode))565		return flags & EXT4_REG_FLMASK;566	else567		return flags & EXT4_OTHER_FLMASK;568}569 570/*571 * Inode flags used for atomic set/get572 */573enum {574	EXT4_INODE_SECRM	= 0,	/* Secure deletion */575	EXT4_INODE_UNRM		= 1,	/* Undelete */576	EXT4_INODE_COMPR	= 2,	/* Compress file */577	EXT4_INODE_SYNC		= 3,	/* Synchronous updates */578	EXT4_INODE_IMMUTABLE	= 4,	/* Immutable file */579	EXT4_INODE_APPEND	= 5,	/* writes to file may only append */580	EXT4_INODE_NODUMP	= 6,	/* do not dump file */581	EXT4_INODE_NOATIME	= 7,	/* do not update atime */582/* Reserved for compression usage... */583	EXT4_INODE_DIRTY	= 8,584	EXT4_INODE_COMPRBLK	= 9,	/* One or more compressed clusters */585	EXT4_INODE_NOCOMPR	= 10,	/* Don't compress */586	EXT4_INODE_ENCRYPT	= 11,	/* Encrypted file */587/* End compression flags --- maybe not all used */588	EXT4_INODE_INDEX	= 12,	/* hash-indexed directory */589	EXT4_INODE_IMAGIC	= 13,	/* AFS directory */590	EXT4_INODE_JOURNAL_DATA	= 14,	/* file data should be journaled */591	EXT4_INODE_NOTAIL	= 15,	/* file tail should not be merged */592	EXT4_INODE_DIRSYNC	= 16,	/* dirsync behaviour (directories only) */593	EXT4_INODE_TOPDIR	= 17,	/* Top of directory hierarchies*/594	EXT4_INODE_HUGE_FILE	= 18,	/* Set to each huge file */595	EXT4_INODE_EXTENTS	= 19,	/* Inode uses extents */596	EXT4_INODE_VERITY	= 20,	/* Verity protected inode */597	EXT4_INODE_EA_INODE	= 21,	/* Inode used for large EA */598/* 22 was formerly EXT4_INODE_EOFBLOCKS */599	EXT4_INODE_DAX		= 25,	/* Inode is DAX */600	EXT4_INODE_INLINE_DATA	= 28,	/* Data in inode. */601	EXT4_INODE_PROJINHERIT	= 29,	/* Create with parents projid */602	EXT4_INODE_CASEFOLD	= 30,	/* Casefolded directory */603	EXT4_INODE_RESERVED	= 31,	/* reserved for ext4 lib */604};605 606/*607 * Since it's pretty easy to mix up bit numbers and hex values, we use a608 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to609 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost610 * any extra space in the compiled kernel image, otherwise, the build will fail.611 * It's important that these values are the same, since we are using612 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent613 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk614 * values found in ext2, ext3 and ext4 filesystems, and of course the values615 * defined in e2fsprogs.616 *617 * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)618 */619#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG))620#define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))621 622static inline void ext4_check_flag_values(void)623{624	CHECK_FLAG_VALUE(SECRM);625	CHECK_FLAG_VALUE(UNRM);626	CHECK_FLAG_VALUE(COMPR);627	CHECK_FLAG_VALUE(SYNC);628	CHECK_FLAG_VALUE(IMMUTABLE);629	CHECK_FLAG_VALUE(APPEND);630	CHECK_FLAG_VALUE(NODUMP);631	CHECK_FLAG_VALUE(NOATIME);632	CHECK_FLAG_VALUE(DIRTY);633	CHECK_FLAG_VALUE(COMPRBLK);634	CHECK_FLAG_VALUE(NOCOMPR);635	CHECK_FLAG_VALUE(ENCRYPT);636	CHECK_FLAG_VALUE(INDEX);637	CHECK_FLAG_VALUE(IMAGIC);638	CHECK_FLAG_VALUE(JOURNAL_DATA);639	CHECK_FLAG_VALUE(NOTAIL);640	CHECK_FLAG_VALUE(DIRSYNC);641	CHECK_FLAG_VALUE(TOPDIR);642	CHECK_FLAG_VALUE(HUGE_FILE);643	CHECK_FLAG_VALUE(EXTENTS);644	CHECK_FLAG_VALUE(VERITY);645	CHECK_FLAG_VALUE(EA_INODE);646	CHECK_FLAG_VALUE(INLINE_DATA);647	CHECK_FLAG_VALUE(PROJINHERIT);648	CHECK_FLAG_VALUE(CASEFOLD);649	CHECK_FLAG_VALUE(RESERVED);650}651 652#if defined(__KERNEL__) && defined(CONFIG_COMPAT)653struct compat_ext4_new_group_input {654	u32 group;655	compat_u64 block_bitmap;656	compat_u64 inode_bitmap;657	compat_u64 inode_table;658	u32 blocks_count;659	u16 reserved_blocks;660	u16 unused;661};662#endif663 664/* The struct ext4_new_group_input in kernel space, with free_blocks_count */665struct ext4_new_group_data {666	__u32 group;667	__u64 block_bitmap;668	__u64 inode_bitmap;669	__u64 inode_table;670	__u32 blocks_count;671	__u16 reserved_blocks;672	__u16 mdata_blocks;673	__u32 free_clusters_count;674};675 676/* Indexes used to index group tables in ext4_new_group_data */677enum {678	BLOCK_BITMAP = 0,	/* block bitmap */679	INODE_BITMAP,		/* inode bitmap */680	INODE_TABLE,		/* inode tables */681	GROUP_TABLE_COUNT,682};683 684/*685 * Flags used by ext4_map_blocks()686 */687	/* Allocate any needed blocks and/or convert an unwritten688	   extent to be an initialized ext4 */689#define EXT4_GET_BLOCKS_CREATE			0x0001690	/* Request the creation of an unwritten extent */691#define EXT4_GET_BLOCKS_UNWRIT_EXT		0x0002692#define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT	(EXT4_GET_BLOCKS_UNWRIT_EXT|\693						 EXT4_GET_BLOCKS_CREATE)694	/* Caller is from the delayed allocation writeout path695	 * finally doing the actual allocation of delayed blocks */696#define EXT4_GET_BLOCKS_DELALLOC_RESERVE	0x0004697	/* caller is from the direct IO path, request to creation of an698	unwritten extents if not allocated, split the unwritten699	extent if blocks has been preallocated already*/700#define EXT4_GET_BLOCKS_PRE_IO			0x0008701#define EXT4_GET_BLOCKS_CONVERT			0x0010702#define EXT4_GET_BLOCKS_IO_CREATE_EXT		(EXT4_GET_BLOCKS_PRE_IO|\703					 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)704	/* Convert extent to initialized after IO complete */705#define EXT4_GET_BLOCKS_IO_CONVERT_EXT		(EXT4_GET_BLOCKS_CONVERT|\706					 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)707	/* Eventual metadata allocation (due to growing extent tree)708	 * should not fail, so try to use reserved blocks for that.*/709#define EXT4_GET_BLOCKS_METADATA_NOFAIL		0x0020710	/* Don't normalize allocation size (used for fallocate) */711#define EXT4_GET_BLOCKS_NO_NORMALIZE		0x0040712	/* Convert written extents to unwritten */713#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN	0x0100714	/* Write zeros to newly created written extents */715#define EXT4_GET_BLOCKS_ZERO			0x0200716#define EXT4_GET_BLOCKS_CREATE_ZERO		(EXT4_GET_BLOCKS_CREATE |\717					EXT4_GET_BLOCKS_ZERO)718	/* Caller will submit data before dropping transaction handle. This719	 * allows jbd2 to avoid submitting data before commit. */720#define EXT4_GET_BLOCKS_IO_SUBMIT		0x0400721	/* Caller is in the atomic contex, find extent if it has been cached */722#define EXT4_GET_BLOCKS_CACHED_NOWAIT		0x0800723 724/*725 * The bit position of these flags must not overlap with any of the726 * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),727 * read_extent_tree_block(), ext4_split_extent_at(),728 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().729 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be730 * caching the extents when reading from the extent tree while a731 * truncate or punch hole operation is in progress.732 */733#define EXT4_EX_NOCACHE				0x40000000734#define EXT4_EX_FORCE_CACHE			0x20000000735#define EXT4_EX_NOFAIL				0x10000000736 737/*738 * Flags used by ext4_free_blocks739 */740#define EXT4_FREE_BLOCKS_METADATA		0x0001741#define EXT4_FREE_BLOCKS_FORGET			0x0002742#define EXT4_FREE_BLOCKS_VALIDATED		0x0004743#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE		0x0008744#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER	0x0010745#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER	0x0020746#define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040747 748#if defined(__KERNEL__) && defined(CONFIG_COMPAT)749/*750 * ioctl commands in 32 bit emulation751 */752#define EXT4_IOC32_GETVERSION		_IOR('f', 3, int)753#define EXT4_IOC32_SETVERSION		_IOW('f', 4, int)754#define EXT4_IOC32_GETRSVSZ		_IOR('f', 5, int)755#define EXT4_IOC32_SETRSVSZ		_IOW('f', 6, int)756#define EXT4_IOC32_GROUP_EXTEND		_IOW('f', 7, unsigned int)757#define EXT4_IOC32_GROUP_ADD		_IOW('f', 8, struct compat_ext4_new_group_input)758#define EXT4_IOC32_GETVERSION_OLD	FS_IOC32_GETVERSION759#define EXT4_IOC32_SETVERSION_OLD	FS_IOC32_SETVERSION760#endif761 762/* Max physical block we can address w/o extents */763#define EXT4_MAX_BLOCK_FILE_PHYS	0xFFFFFFFF764 765/* Max logical block we can support */766#define EXT4_MAX_LOGICAL_BLOCK		0xFFFFFFFE767 768/*769 * Structure of an inode on the disk770 */771struct ext4_inode {772	__le16	i_mode;		/* File mode */773	__le16	i_uid;		/* Low 16 bits of Owner Uid */774	__le32	i_size_lo;	/* Size in bytes */775	__le32	i_atime;	/* Access time */776	__le32	i_ctime;	/* Inode Change time */777	__le32	i_mtime;	/* Modification time */778	__le32	i_dtime;	/* Deletion Time */779	__le16	i_gid;		/* Low 16 bits of Group Id */780	__le16	i_links_count;	/* Links count */781	__le32	i_blocks_lo;	/* Blocks count */782	__le32	i_flags;	/* File flags */783	union {784		struct {785			__le32  l_i_version;786		} linux1;787		struct {788			__u32  h_i_translator;789		} hurd1;790		struct {791			__u32  m_i_reserved1;792		} masix1;793	} osd1;				/* OS dependent 1 */794	__le32	i_block[EXT4_N_BLOCKS];/* Pointers to blocks */795	__le32	i_generation;	/* File version (for NFS) */796	__le32	i_file_acl_lo;	/* File ACL */797	__le32	i_size_high;798	__le32	i_obso_faddr;	/* Obsoleted fragment address */799	union {800		struct {801			__le16	l_i_blocks_high; /* were l_i_reserved1 */802			__le16	l_i_file_acl_high;803			__le16	l_i_uid_high;	/* these 2 fields */804			__le16	l_i_gid_high;	/* were reserved2[0] */805			__le16	l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */806			__le16	l_i_reserved;807		} linux2;808		struct {809			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */810			__u16	h_i_mode_high;811			__u16	h_i_uid_high;812			__u16	h_i_gid_high;813			__u32	h_i_author;814		} hurd2;815		struct {816			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */817			__le16	m_i_file_acl_high;818			__u32	m_i_reserved2[2];819		} masix2;820	} osd2;				/* OS dependent 2 */821	__le16	i_extra_isize;822	__le16	i_checksum_hi;	/* crc32c(uuid+inum+inode) BE */823	__le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */824	__le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */825	__le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */826	__le32  i_crtime;       /* File Creation time */827	__le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */828	__le32  i_version_hi;	/* high 32 bits for 64-bit version */829	__le32	i_projid;	/* Project ID */830};831 832#define EXT4_EPOCH_BITS 2833#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)834#define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)835 836/*837 * Extended fields will fit into an inode if the filesystem was formatted838 * with large inodes (-I 256 or larger) and there are not currently any EAs839 * consuming all of the available space. For new inodes we always reserve840 * enough space for the kernel's known extended fields, but for inodes841 * created with an old kernel this might not have been the case. None of842 * the extended inode fields is critical for correct filesystem operation.843 * This macro checks if a certain field fits in the inode. Note that844 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize845 */846#define EXT4_FITS_IN_INODE(ext4_inode, einode, field)	\847	((offsetof(typeof(*ext4_inode), field) +	\848	  sizeof((ext4_inode)->field))			\849	<= (EXT4_GOOD_OLD_INODE_SIZE +			\850	    (einode)->i_extra_isize))			\851 852/*853 * We use an encoding that preserves the times for extra epoch "00":854 *855 * extra  msb of                         adjust for signed856 * epoch  32-bit                         32-bit tv_sec to857 * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range858 * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31859 * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19860 * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07861 * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25862 * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16863 * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04864 * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22865 * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10866 *867 * Note that previous versions of the kernel on 64-bit systems would868 * incorrectly use extra epoch bits 1,1 for dates between 1901 and869 * 1970.  e2fsck will correct this, assuming that it is run on the870 * affected filesystem before 2242.871 */872 873static inline __le32 ext4_encode_extra_time(struct timespec64 ts)874{875	u32 extra = ((ts.tv_sec - (s32)ts.tv_sec) >> 32) & EXT4_EPOCH_MASK;876	return cpu_to_le32(extra | (ts.tv_nsec << EXT4_EPOCH_BITS));877}878 879static inline struct timespec64 ext4_decode_extra_time(__le32 base,880						       __le32 extra)881{882	struct timespec64 ts = { .tv_sec = (signed)le32_to_cpu(base) };883 884	if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))885		ts.tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;886	ts.tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;887	return ts;888}889 890#define EXT4_INODE_SET_XTIME_VAL(xtime, inode, raw_inode, ts)			\891do {										\892	if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {	\893		(raw_inode)->xtime = cpu_to_le32((ts).tv_sec);			\894		(raw_inode)->xtime ## _extra = ext4_encode_extra_time(ts);	\895	} else									\896		(raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (ts).tv_sec, S32_MIN, S32_MAX));	\897} while (0)898 899#define EXT4_INODE_SET_ATIME(inode, raw_inode)						\900	EXT4_INODE_SET_XTIME_VAL(i_atime, inode, raw_inode, inode_get_atime(inode))901 902#define EXT4_INODE_SET_MTIME(inode, raw_inode)						\903	EXT4_INODE_SET_XTIME_VAL(i_mtime, inode, raw_inode, inode_get_mtime(inode))904 905#define EXT4_INODE_SET_CTIME(inode, raw_inode)						\906	EXT4_INODE_SET_XTIME_VAL(i_ctime, inode, raw_inode, inode_get_ctime(inode))907 908#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)				\909	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))			\910		EXT4_INODE_SET_XTIME_VAL(xtime, &((einode)->vfs_inode),		\911					 raw_inode, (einode)->xtime)912 913#define EXT4_INODE_GET_XTIME_VAL(xtime, inode, raw_inode)			\914	(EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra) ?	\915		ext4_decode_extra_time((raw_inode)->xtime,				\916				       (raw_inode)->xtime ## _extra) :		\917		(struct timespec64) {						\918			.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime)	\919		})920 921#define EXT4_INODE_GET_ATIME(inode, raw_inode)					\922do {										\923	inode_set_atime_to_ts(inode,						\924		EXT4_INODE_GET_XTIME_VAL(i_atime, inode, raw_inode));		\925} while (0)926 927#define EXT4_INODE_GET_MTIME(inode, raw_inode)					\928do {										\929	inode_set_mtime_to_ts(inode,						\930		EXT4_INODE_GET_XTIME_VAL(i_mtime, inode, raw_inode));		\931} while (0)932 933#define EXT4_INODE_GET_CTIME(inode, raw_inode)					\934do {										\935	inode_set_ctime_to_ts(inode,						\936		EXT4_INODE_GET_XTIME_VAL(i_ctime, inode, raw_inode));		\937} while (0)938 939#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)				\940do {										\941	if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) 			\942		(einode)->xtime =						\943			EXT4_INODE_GET_XTIME_VAL(xtime, &(einode->vfs_inode),	\944						 raw_inode);			\945	else									\946		(einode)->xtime = (struct timespec64){0, 0};			\947} while (0)948 949#define i_disk_version osd1.linux1.l_i_version950 951#if defined(__KERNEL__) || defined(__linux__)952#define i_reserved1	osd1.linux1.l_i_reserved1953#define i_file_acl_high	osd2.linux2.l_i_file_acl_high954#define i_blocks_high	osd2.linux2.l_i_blocks_high955#define i_uid_low	i_uid956#define i_gid_low	i_gid957#define i_uid_high	osd2.linux2.l_i_uid_high958#define i_gid_high	osd2.linux2.l_i_gid_high959#define i_checksum_lo	osd2.linux2.l_i_checksum_lo960 961#elif defined(__GNU__)962 963#define i_translator	osd1.hurd1.h_i_translator964#define i_uid_high	osd2.hurd2.h_i_uid_high965#define i_gid_high	osd2.hurd2.h_i_gid_high966#define i_author	osd2.hurd2.h_i_author967 968#elif defined(__masix__)969 970#define i_reserved1	osd1.masix1.m_i_reserved1971#define i_file_acl_high	osd2.masix2.m_i_file_acl_high972#define i_reserved2	osd2.masix2.m_i_reserved2973 974#endif /* defined(__KERNEL__) || defined(__linux__) */975 976#include "extents_status.h"977#include "fast_commit.h"978 979/*980 * Lock subclasses for i_data_sem in the ext4_inode_info structure.981 *982 * These are needed to avoid lockdep false positives when we need to983 * allocate blocks to the quota inode during ext4_map_blocks(), while984 * holding i_data_sem for a normal (non-quota) inode.  Since we don't985 * do quota tracking for the quota inode, this avoids deadlock (as986 * well as infinite recursion, since it isn't turtles all the way987 * down...)988 *989 *  I_DATA_SEM_NORMAL - Used for most inodes990 *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode991 *			  where the second inode has larger inode number992 *			  than the first993 *  I_DATA_SEM_QUOTA  - Used for quota inodes only994 *  I_DATA_SEM_EA     - Used for ea_inodes only995 */996enum {997	I_DATA_SEM_NORMAL = 0,998	I_DATA_SEM_OTHER,999	I_DATA_SEM_QUOTA,1000	I_DATA_SEM_EA1001};1002 1003 1004/*1005 * fourth extended file system inode data in memory1006 */1007struct ext4_inode_info {1008	__le32	i_data[15];	/* unconverted */1009	__u32	i_dtime;1010	ext4_fsblk_t	i_file_acl;1011 1012	/*1013	 * i_block_group is the number of the block group which contains1014	 * this file's inode.  Constant across the lifetime of the inode,1015	 * it is used for making block allocation decisions - we try to1016	 * place a file's data blocks near its inode block, and new inodes1017	 * near to their parent directory's inode.1018	 */1019	ext4_group_t	i_block_group;1020	ext4_lblk_t	i_dir_start_lookup;1021#if (BITS_PER_LONG < 64)1022	unsigned long	i_state_flags;		/* Dynamic state flags */1023#endif1024	unsigned long	i_flags;1025 1026	/*1027	 * Extended attributes can be read independently of the main file1028	 * data. Taking i_rwsem even when reading would cause contention1029	 * between readers of EAs and writers of regular file data, so1030	 * instead we synchronize on xattr_sem when reading or changing1031	 * EAs.1032	 */1033	struct rw_semaphore xattr_sem;1034 1035	/*1036	 * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise1037	 * i_orphan is used.1038	 */1039	union {1040		struct list_head i_orphan;	/* unlinked but open inodes */1041		unsigned int i_orphan_idx;	/* Index in orphan file */1042	};1043 1044	/* Fast commit related info */1045 1046	/* For tracking dentry create updates */1047	struct list_head i_fc_dilist;1048	struct list_head i_fc_list;	/*1049					 * inodes that need fast commit1050					 * protected by sbi->s_fc_lock.1051					 */1052 1053	/* Start of lblk range that needs to be committed in this fast commit */1054	ext4_lblk_t i_fc_lblk_start;1055 1056	/* End of lblk range that needs to be committed in this fast commit */1057	ext4_lblk_t i_fc_lblk_len;1058 1059	/* Number of ongoing updates on this inode */1060	atomic_t  i_fc_updates;1061	atomic_t i_unwritten; /* Nr. of inflight conversions pending */1062 1063	/* Fast commit wait queue for this inode */1064	wait_queue_head_t i_fc_wait;1065 1066	/* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */1067	struct mutex i_fc_lock;1068 1069	/*1070	 * i_disksize keeps track of what the inode size is ON DISK, not1071	 * in memory.  During truncate, i_size is set to the new size by1072	 * the VFS prior to calling ext4_truncate(), but the filesystem won't1073	 * set i_disksize to 0 until the truncate is actually under way.1074	 *1075	 * The intent is that i_disksize always represents the blocks which1076	 * are used by this file.  This allows recovery to restart truncate1077	 * on orphans if we crash during truncate.  We actually write i_disksize1078	 * into the on-disk inode when writing inodes out, instead of i_size.1079	 *1080	 * The only time when i_disksize and i_size may be different is when1081	 * a truncate is in progress.  The only things which change i_disksize1082	 * are ext4_get_block (growth) and ext4_truncate (shrinkth).1083	 */1084	loff_t	i_disksize;1085 1086	/*1087	 * i_data_sem is for serialising ext4_truncate() against1088	 * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's1089	 * data tree are chopped off during truncate. We can't do that in1090	 * ext4 because whenever we perform intermediate commits during1091	 * truncate, the inode and all the metadata blocks *must* be in a1092	 * consistent state which allows truncation of the orphans to restart1093	 * during recovery.  Hence we must fix the get_block-vs-truncate race1094	 * by other means, so we have i_data_sem.1095	 */1096	struct rw_semaphore i_data_sem;1097	struct inode vfs_inode;1098	struct jbd2_inode *jinode;1099 1100	spinlock_t i_raw_lock;	/* protects updates to the raw inode */1101 1102	/*1103	 * File creation time. Its function is same as that of1104	 * struct timespec64 i_{a,c,m}time in the generic inode.1105	 */1106	struct timespec64 i_crtime;1107 1108	/* mballoc */1109	atomic_t i_prealloc_active;1110 1111	/* allocation reservation info for delalloc */1112	/* In case of bigalloc, this refer to clusters rather than blocks */1113	unsigned int i_reserved_data_blocks;1114	struct rb_root i_prealloc_node;1115	rwlock_t i_prealloc_lock;1116 1117	/* extents status tree */1118	struct ext4_es_tree i_es_tree;1119	rwlock_t i_es_lock;1120	struct list_head i_es_list;1121	unsigned int i_es_all_nr;	/* protected by i_es_lock */1122	unsigned int i_es_shk_nr;	/* protected by i_es_lock */1123	ext4_lblk_t i_es_shrink_lblk;	/* Offset where we start searching for1124					   extents to shrink. Protected by1125					   i_es_lock  */1126 1127	/* ialloc */1128	ext4_group_t	i_last_alloc_group;1129 1130	/* pending cluster reservations for bigalloc file systems */1131	struct ext4_pending_tree i_pending_tree;1132 1133	/* on-disk additional length */1134	__u16 i_extra_isize;1135 1136	/* Indicate the inline data space. */1137	u16 i_inline_off;1138	u16 i_inline_size;1139 1140#ifdef CONFIG_QUOTA1141	/* quota space reservation, managed internally by quota code */1142	qsize_t i_reserved_quota;1143#endif1144 1145	/* Lock protecting lists below */1146	spinlock_t i_completed_io_lock;1147	/*1148	 * Completed IOs that need unwritten extents handling and have1149	 * transaction reserved1150	 */1151	struct list_head i_rsv_conversion_list;1152	struct work_struct i_rsv_conversion_work;1153 1154	spinlock_t i_block_reservation_lock;1155 1156	/*1157	 * Transactions that contain inode's metadata needed to complete1158	 * fsync and fdatasync, respectively.1159	 */1160	tid_t i_sync_tid;1161	tid_t i_datasync_tid;1162 1163#ifdef CONFIG_QUOTA1164	struct dquot __rcu *i_dquot[MAXQUOTAS];1165#endif1166 1167	/* Precomputed uuid+inum+igen checksum for seeding inode checksums */1168	__u32 i_csum_seed;1169 1170	kprojid_t i_projid;1171};1172 1173/*1174 * File system states1175 */1176#define	EXT4_VALID_FS			0x0001	/* Unmounted cleanly */1177#define	EXT4_ERROR_FS			0x0002	/* Errors detected */1178#define	EXT4_ORPHAN_FS			0x0004	/* Orphans being recovered */1179#define EXT4_FC_REPLAY			0x0020	/* Fast commit replay ongoing */1180 1181/*1182 * Misc. filesystem flags1183 */1184#define EXT2_FLAGS_SIGNED_HASH		0x0001  /* Signed dirhash in use */1185#define EXT2_FLAGS_UNSIGNED_HASH	0x0002  /* Unsigned dirhash in use */1186#define EXT2_FLAGS_TEST_FILESYS		0x0004	/* to test development code */1187 1188/*1189 * Mount flags set via mount options or defaults1190 */1191#define EXT4_MOUNT_NO_MBCACHE		0x00001 /* Do not use mbcache */1192#define EXT4_MOUNT_GRPID		0x00004	/* Create files with directory's group */1193#define EXT4_MOUNT_DEBUG		0x00008	/* Some debugging messages */1194#define EXT4_MOUNT_ERRORS_CONT		0x00010	/* Continue on errors */1195#define EXT4_MOUNT_ERRORS_RO		0x00020	/* Remount fs ro on errors */1196#define EXT4_MOUNT_ERRORS_PANIC		0x00040	/* Panic on errors */1197#define EXT4_MOUNT_ERRORS_MASK		0x000701198#define EXT4_MOUNT_MINIX_DF		0x00080	/* Mimics the Minix statfs */1199#define EXT4_MOUNT_NOLOAD		0x00100	/* Don't use existing journal*/1200#ifdef CONFIG_FS_DAX1201#define EXT4_MOUNT_DAX_ALWAYS		0x00200	/* Direct Access */1202#else1203#define EXT4_MOUNT_DAX_ALWAYS		01204#endif1205#define EXT4_MOUNT_DATA_FLAGS		0x00C00	/* Mode for data writes: */1206#define EXT4_MOUNT_JOURNAL_DATA		0x00400	/* Write data to journal */1207#define EXT4_MOUNT_ORDERED_DATA		0x00800	/* Flush data before commit */1208#define EXT4_MOUNT_WRITEBACK_DATA	0x00C00	/* No data ordering */1209#define EXT4_MOUNT_UPDATE_JOURNAL	0x01000	/* Update the journal format */1210#define EXT4_MOUNT_NO_UID32		0x02000  /* Disable 32-bit UIDs */1211#define EXT4_MOUNT_XATTR_USER		0x04000	/* Extended user attributes */1212#define EXT4_MOUNT_POSIX_ACL		0x08000	/* POSIX Access Control Lists */1213#define EXT4_MOUNT_NO_AUTO_DA_ALLOC	0x10000	/* No auto delalloc mapping */1214#define EXT4_MOUNT_BARRIER		0x20000 /* Use block barriers */1215#define EXT4_MOUNT_QUOTA		0x40000 /* Some quota option set */1216#define EXT4_MOUNT_USRQUOTA		0x80000 /* "old" user quota,1217						 * enable enforcement for hidden1218						 * quota files */1219#define EXT4_MOUNT_GRPQUOTA		0x100000 /* "old" group quota, enable1220						  * enforcement for hidden quota1221						  * files */1222#define EXT4_MOUNT_PRJQUOTA		0x200000 /* Enable project quota1223						  * enforcement */1224#define EXT4_MOUNT_DIOREAD_NOLOCK	0x400000 /* Enable support for dio read nolocking */1225#define EXT4_MOUNT_JOURNAL_CHECKSUM	0x800000 /* Journal checksums */1226#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT	0x1000000 /* Journal Async Commit */1227#define EXT4_MOUNT_WARN_ON_ERROR	0x2000000 /* Trigger WARN_ON on error */1228#define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x40000001229#define EXT4_MOUNT_DELALLOC		0x8000000 /* Delalloc support */1230#define EXT4_MOUNT_DATA_ERR_ABORT	0x10000000 /* Abort on file data write */1231#define EXT4_MOUNT_BLOCK_VALIDITY	0x20000000 /* Block validity checking */1232#define EXT4_MOUNT_DISCARD		0x40000000 /* Issue DISCARD requests */1233#define EXT4_MOUNT_INIT_INODE_TABLE	0x80000000 /* Initialize uninitialized itables */1234 1235/*1236 * Mount flags set either automatically (could not be set by mount option)1237 * based on per file system feature or property or in special cases such as1238 * distinguishing between explicit mount option definition and default.1239 */1240#define EXT4_MOUNT2_EXPLICIT_DELALLOC	0x00000001 /* User explicitly1241						      specified delalloc */1242#define EXT4_MOUNT2_STD_GROUP_SIZE	0x00000002 /* We have standard group1243						      size of blocksize * 81244						      blocks */1245#define EXT4_MOUNT2_HURD_COMPAT		0x00000004 /* Support HURD-castrated1246						      file systems */1247#define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM	0x00000008 /* User explicitly1248						specified journal checksum */1249 1250#define EXT4_MOUNT2_JOURNAL_FAST_COMMIT	0x00000010 /* Journal fast commit */1251#define EXT4_MOUNT2_DAX_NEVER		0x00000020 /* Do not allow Direct Access */1252#define EXT4_MOUNT2_DAX_INODE		0x00000040 /* For printing options only */1253#define EXT4_MOUNT2_MB_OPTIMIZE_SCAN	0x00000080 /* Optimize group1254						    * scanning in mballoc1255						    */1256#define EXT4_MOUNT2_ABORT		0x00000100 /* Abort filesystem */1257 1258#define clear_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt &= \1259						~EXT4_MOUNT_##opt1260#define set_opt(sb, opt)		EXT4_SB(sb)->s_mount_opt |= \1261						EXT4_MOUNT_##opt1262#define test_opt(sb, opt)		(EXT4_SB(sb)->s_mount_opt & \1263					 EXT4_MOUNT_##opt)1264 1265#define clear_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 &= \1266						~EXT4_MOUNT2_##opt1267#define set_opt2(sb, opt)		EXT4_SB(sb)->s_mount_opt2 |= \1268						EXT4_MOUNT2_##opt1269#define test_opt2(sb, opt)		(EXT4_SB(sb)->s_mount_opt2 & \1270					 EXT4_MOUNT2_##opt)1271 1272#define ext4_test_and_set_bit		__test_and_set_bit_le1273#define ext4_set_bit			__set_bit_le1274#define ext4_test_and_clear_bit		__test_and_clear_bit_le1275#define ext4_clear_bit			__clear_bit_le1276#define ext4_test_bit			test_bit_le1277#define ext4_find_next_zero_bit		find_next_zero_bit_le1278#define ext4_find_next_bit		find_next_bit_le1279 1280extern void mb_set_bits(void *bm, int cur, int len);1281 1282/*1283 * Maximal mount counts between two filesystem checks1284 */1285#define EXT4_DFL_MAX_MNT_COUNT		20	/* Allow 20 mounts */1286#define EXT4_DFL_CHECKINTERVAL		0	/* Don't use interval check */1287 1288/*1289 * Behaviour when detecting errors1290 */1291#define EXT4_ERRORS_CONTINUE		1	/* Continue execution */1292#define EXT4_ERRORS_RO			2	/* Remount fs read-only */1293#define EXT4_ERRORS_PANIC		3	/* Panic */1294#define EXT4_ERRORS_DEFAULT		EXT4_ERRORS_CONTINUE1295 1296/* Metadata checksum algorithm codes */1297#define EXT4_CRC32C_CHKSUM		11298 1299#define EXT4_LABEL_MAX			161300 1301/*1302 * Structure of the super block1303 */1304struct ext4_super_block {1305/*00*/	__le32	s_inodes_count;		/* Inodes count */1306	__le32	s_blocks_count_lo;	/* Blocks count */1307	__le32	s_r_blocks_count_lo;	/* Reserved blocks count */1308	__le32	s_free_blocks_count_lo;	/* Free blocks count */1309/*10*/	__le32	s_free_inodes_count;	/* Free inodes count */1310	__le32	s_first_data_block;	/* First Data Block */1311	__le32	s_log_block_size;	/* Block size */1312	__le32	s_log_cluster_size;	/* Allocation cluster size */1313/*20*/	__le32	s_blocks_per_group;	/* # Blocks per group */1314	__le32	s_clusters_per_group;	/* # Clusters per group */1315	__le32	s_inodes_per_group;	/* # Inodes per group */1316	__le32	s_mtime;		/* Mount time */1317/*30*/	__le32	s_wtime;		/* Write time */1318	__le16	s_mnt_count;		/* Mount count */1319	__le16	s_max_mnt_count;	/* Maximal mount count */1320	__le16	s_magic;		/* Magic signature */1321	__le16	s_state;		/* File system state */1322	__le16	s_errors;		/* Behaviour when detecting errors */1323	__le16	s_minor_rev_level;	/* minor revision level */1324/*40*/	__le32	s_lastcheck;		/* time of last check */1325	__le32	s_checkinterval;	/* max. time between checks */1326	__le32	s_creator_os;		/* OS */1327	__le32	s_rev_level;		/* Revision level */1328/*50*/	__le16	s_def_resuid;		/* Default uid for reserved blocks */1329	__le16	s_def_resgid;		/* Default gid for reserved blocks */1330	/*1331	 * These fields are for EXT4_DYNAMIC_REV superblocks only.1332	 *1333	 * Note: the difference between the compatible feature set and1334	 * the incompatible feature set is that if there is a bit set1335	 * in the incompatible feature set that the kernel doesn't1336	 * know about, it should refuse to mount the filesystem.1337	 *1338	 * e2fsck's requirements are more strict; if it doesn't know1339	 * about a feature in either the compatible or incompatible1340	 * feature set, it must abort and not try to meddle with1341	 * things it doesn't understand...1342	 */1343	__le32	s_first_ino;		/* First non-reserved inode */1344	__le16  s_inode_size;		/* size of inode structure */1345	__le16	s_block_group_nr;	/* block group # of this superblock */1346	__le32	s_feature_compat;	/* compatible feature set */1347/*60*/	__le32	s_feature_incompat;	/* incompatible feature set */1348	__le32	s_feature_ro_compat;	/* readonly-compatible feature set */1349/*68*/	__u8	s_uuid[16];		/* 128-bit uuid for volume */1350/*78*/	char	s_volume_name[EXT4_LABEL_MAX] __nonstring; /* volume name */1351/*88*/	char	s_last_mounted[64] __nonstring;	/* directory where last mounted */1352/*C8*/	__le32	s_algorithm_usage_bitmap; /* For compression */1353	/*1354	 * Performance hints.  Directory preallocation should only1355	 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.1356	 */1357	__u8	s_prealloc_blocks;	/* Nr of blocks to try to preallocate*/1358	__u8	s_prealloc_dir_blocks;	/* Nr to preallocate for dirs */1359	__le16	s_reserved_gdt_blocks;	/* Per group desc for online growth */1360	/*1361	 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.1362	 */1363/*D0*/	__u8	s_journal_uuid[16];	/* uuid of journal superblock */1364/*E0*/	__le32	s_journal_inum;		/* inode number of journal file */1365	__le32	s_journal_dev;		/* device number of journal file */1366	__le32	s_last_orphan;		/* start of list of inodes to delete */1367	__le32	s_hash_seed[4];		/* HTREE hash seed */1368	__u8	s_def_hash_version;	/* Default hash version to use */1369	__u8	s_jnl_backup_type;1370	__le16  s_desc_size;		/* size of group descriptor */1371/*100*/	__le32	s_default_mount_opts;1372	__le32	s_first_meta_bg;	/* First metablock block group */1373	__le32	s_mkfs_time;		/* When the filesystem was created */1374	__le32	s_jnl_blocks[17];	/* Backup of the journal inode */1375	/* 64bit support valid if EXT4_FEATURE_INCOMPAT_64BIT */1376/*150*/	__le32	s_blocks_count_hi;	/* Blocks count */1377	__le32	s_r_blocks_count_hi;	/* Reserved blocks count */1378	__le32	s_free_blocks_count_hi;	/* Free blocks count */1379	__le16	s_min_extra_isize;	/* All inodes have at least # bytes */1380	__le16	s_want_extra_isize; 	/* New inodes should reserve # bytes */1381	__le32	s_flags;		/* Miscellaneous flags */1382	__le16  s_raid_stride;		/* RAID stride */1383	__le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */1384	__le64  s_mmp_block;            /* Block for multi-mount protection */1385	__le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/1386	__u8	s_log_groups_per_flex;  /* FLEX_BG group size */1387	__u8	s_checksum_type;	/* metadata checksum algorithm used */1388	__u8	s_encryption_level;	/* versioning level for encryption */1389	__u8	s_reserved_pad;		/* Padding to next 32bits */1390	__le64	s_kbytes_written;	/* nr of lifetime kilobytes written */1391	__le32	s_snapshot_inum;	/* Inode number of active snapshot */1392	__le32	s_snapshot_id;		/* sequential ID of active snapshot */1393	__le64	s_snapshot_r_blocks_count; /* reserved blocks for active1394					      snapshot's future use */1395	__le32	s_snapshot_list;	/* inode number of the head of the1396					   on-disk snapshot list */1397#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)1398	__le32	s_error_count;		/* number of fs errors */1399	__le32	s_first_error_time;	/* first time an error happened */1400	__le32	s_first_error_ino;	/* inode involved in first error */1401	__le64	s_first_error_block;	/* block involved of first error */1402	__u8	s_first_error_func[32] __nonstring;	/* function where the error happened */1403	__le32	s_first_error_line;	/* line number where error happened */1404	__le32	s_last_error_time;	/* most recent time of an error */1405	__le32	s_last_error_ino;	/* inode involved in last error */1406	__le32	s_last_error_line;	/* line number where error happened */1407	__le64	s_last_error_block;	/* block involved of last error */1408	__u8	s_last_error_func[32] __nonstring;	/* function where the error happened */1409#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)1410	__u8	s_mount_opts[64];1411	__le32	s_usr_quota_inum;	/* inode for tracking user quota */1412	__le32	s_grp_quota_inum;	/* inode for tracking group quota */1413	__le32	s_overhead_clusters;	/* overhead blocks/clusters in fs */1414	__le32	s_backup_bgs[2];	/* groups with sparse_super2 SBs */1415	__u8	s_encrypt_algos[4];	/* Encryption algorithms in use  */1416	__u8	s_encrypt_pw_salt[16];	/* Salt used for string2key algorithm */1417	__le32	s_lpf_ino;		/* Location of the lost+found inode */1418	__le32	s_prj_quota_inum;	/* inode for tracking project quota */1419	__le32	s_checksum_seed;	/* crc32c(uuid) if csum_seed set */1420	__u8	s_wtime_hi;1421	__u8	s_mtime_hi;1422	__u8	s_mkfs_time_hi;1423	__u8	s_lastcheck_hi;1424	__u8	s_first_error_time_hi;1425	__u8	s_last_error_time_hi;1426	__u8	s_first_error_errcode;1427	__u8    s_last_error_errcode;1428	__le16  s_encoding;		/* Filename charset encoding */1429	__le16  s_encoding_flags;	/* Filename charset encoding flags */1430	__le32  s_orphan_file_inum;	/* Inode for tracking orphan inodes */1431	__le32	s_reserved[94];		/* Padding to the end of the block */1432	__le32	s_checksum;		/* crc32c(superblock) */1433};1434 1435#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)1436 1437#ifdef __KERNEL__1438 1439/* Number of quota types we support */1440#define EXT4_MAXQUOTAS 31441 1442#define EXT4_ENC_UTF8_12_1	11443 1444/* Types of ext4 journal triggers */1445enum ext4_journal_trigger_type {1446	EXT4_JTR_ORPHAN_FILE,1447	EXT4_JTR_NONE	/* This must be the last entry for indexing to work! */1448};1449 1450#define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE1451 1452struct ext4_journal_trigger {1453	struct jbd2_buffer_trigger_type tr_triggers;1454	struct super_block *sb;1455};1456 1457static inline struct ext4_journal_trigger *EXT4_TRIGGER(1458				struct jbd2_buffer_trigger_type *trigger)1459{1460	return container_of(trigger, struct ext4_journal_trigger, tr_triggers);1461}1462 1463#define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca041464 1465/* Structure at the tail of orphan block */1466struct ext4_orphan_block_tail {1467	__le32 ob_magic;1468	__le32 ob_checksum;1469};1470 1471static inline int ext4_inodes_per_orphan_block(struct super_block *sb)1472{1473	return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) /1474			sizeof(u32);1475}1476 1477struct ext4_orphan_block {1478	atomic_t ob_free_entries;	/* Number of free orphan entries in block */1479	struct buffer_head *ob_bh;	/* Buffer for orphan block */1480};1481 1482/*1483 * Info about orphan file.1484 */1485struct ext4_orphan_info {1486	int of_blocks;			/* Number of orphan blocks in a file */1487	__u32 of_csum_seed;		/* Checksum seed for orphan file */1488	struct ext4_orphan_block *of_binfo;	/* Array with info about orphan1489						 * file blocks */1490};1491 1492/*1493 * fourth extended-fs super-block data in memory1494 */1495struct ext4_sb_info {1496	unsigned long s_desc_size;	/* Size of a group descriptor in bytes */1497	unsigned long s_inodes_per_block;/* Number of inodes per block */1498	unsigned long s_blocks_per_group;/* Number of blocks in a group */1499	unsigned long s_clusters_per_group; /* Number of clusters in a group */1500	unsigned long s_inodes_per_group;/* Number of inodes in a group */1501	unsigned long s_itb_per_group;	/* Number of inode table blocks per group */1502	unsigned long s_gdb_count;	/* Number of group descriptor blocks */1503	unsigned long s_desc_per_block;	/* Number of group descriptors per block */1504	ext4_group_t s_groups_count;	/* Number of groups in the fs */1505	ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */1506	unsigned long s_overhead;  /* # of fs overhead clusters */1507	unsigned int s_cluster_ratio;	/* Number of blocks per cluster */1508	unsigned int s_cluster_bits;	/* log2 of s_cluster_ratio */1509	loff_t s_bitmap_maxbytes;	/* max bytes for bitmap files */1510	struct buffer_head * s_sbh;	/* Buffer containing the super block */1511	struct ext4_super_block *s_es;	/* Pointer to the super block in the buffer */1512	/* Array of bh's for the block group descriptors */1513	struct buffer_head * __rcu *s_group_desc;1514	unsigned int s_mount_opt;1515	unsigned int s_mount_opt2;1516	unsigned long s_mount_flags;1517	unsigned int s_def_mount_opt;1518	unsigned int s_def_mount_opt2;1519	ext4_fsblk_t s_sb_block;1520	atomic64_t s_resv_clusters;1521	kuid_t s_resuid;1522	kgid_t s_resgid;1523	unsigned short s_mount_state;1524	unsigned short s_pad;1525	int s_addr_per_block_bits;1526	int s_desc_per_block_bits;1527	int s_inode_size;1528	int s_first_ino;1529	unsigned int s_inode_readahead_blks;1530	unsigned int s_inode_goal;1531	u32 s_hash_seed[4];1532	int s_def_hash_version;1533	int s_hash_unsigned;	/* 3 if hash should be unsigned, 0 if not */1534	struct percpu_counter s_freeclusters_counter;1535	struct percpu_counter s_freeinodes_counter;1536	struct percpu_counter s_dirs_counter;1537	struct percpu_counter s_dirtyclusters_counter;1538	struct percpu_counter s_sra_exceeded_retry_limit;1539	struct blockgroup_lock *s_blockgroup_lock;1540	struct proc_dir_entry *s_proc;1541	struct kobject s_kobj;1542	struct completion s_kobj_unregister;1543	struct super_block *s_sb;1544	struct buffer_head *s_mmp_bh;1545 1546	/* Journaling */1547	struct journal_s *s_journal;1548	unsigned long s_ext4_flags;		/* Ext4 superblock flags */1549	struct mutex s_orphan_lock;	/* Protects on disk list changes */1550	struct list_head s_orphan;	/* List of orphaned inodes in on disk1551					   list */1552	struct ext4_orphan_info s_orphan_info;1553	unsigned long s_commit_interval;1554	u32 s_max_batch_time;1555	u32 s_min_batch_time;1556	struct file *s_journal_bdev_file;1557#ifdef CONFIG_QUOTA1558	/* Names of quota files with journalled quota */1559	char __rcu *s_qf_names[EXT4_MAXQUOTAS];1560	int s_jquota_fmt;			/* Format of quota to use */1561#endif1562	unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */1563	struct ext4_system_blocks __rcu *s_system_blks;1564 1565#ifdef EXTENTS_STATS1566	/* ext4 extents stats */1567	unsigned long s_ext_min;1568	unsigned long s_ext_max;1569	unsigned long s_depth_max;1570	spinlock_t s_ext_stats_lock;1571	unsigned long s_ext_blocks;1572	unsigned long s_ext_extents;1573#endif1574 1575	/* for buddy allocator */1576	struct ext4_group_info ** __rcu *s_group_info;1577	struct inode *s_buddy_cache;1578	spinlock_t s_md_lock;1579	unsigned short *s_mb_offsets;1580	unsigned int *s_mb_maxs;1581	unsigned int s_group_info_size;1582	unsigned int s_mb_free_pending;1583	struct list_head s_freed_data_list[2];	/* List of blocks to be freed1584						   after commit completed */1585	struct list_head s_discard_list;1586	struct work_struct s_discard_work;1587	atomic_t s_retry_alloc_pending;1588	struct list_head *s_mb_avg_fragment_size;1589	rwlock_t *s_mb_avg_fragment_size_locks;1590	struct list_head *s_mb_largest_free_orders;1591	rwlock_t *s_mb_largest_free_orders_locks;1592 1593	/* tunables */1594	unsigned long s_stripe;1595	unsigned int s_mb_max_linear_groups;1596	unsigned int s_mb_stream_request;1597	unsigned int s_mb_max_to_scan;1598	unsigned int s_mb_min_to_scan;1599	unsigned int s_mb_stats;1600	unsigned int s_mb_order2_reqs;1601	unsigned int s_mb_group_prealloc;1602	unsigned int s_max_dir_size_kb;1603	/* where last allocation was done - for stream allocation */1604	unsigned long s_mb_last_group;1605	unsigned long s_mb_last_start;1606	unsigned int s_mb_prefetch;1607	unsigned int s_mb_prefetch_limit;1608	unsigned int s_mb_best_avail_max_trim_order;1609 1610	/* stats for buddy allocator */1611	atomic_t s_bal_reqs;	/* number of reqs with len > 1 */1612	atomic_t s_bal_success;	/* we found long enough chunks */1613	atomic_t s_bal_allocated;	/* in blocks */1614	atomic_t s_bal_ex_scanned;	/* total extents scanned */1615	atomic_t s_bal_cX_ex_scanned[EXT4_MB_NUM_CRS];	/* total extents scanned */1616	atomic_t s_bal_groups_scanned;	/* number of groups scanned */1617	atomic_t s_bal_goals;	/* goal hits */1618	atomic_t s_bal_len_goals;	/* len goal hits */1619	atomic_t s_bal_breaks;	/* too long searches */1620	atomic_t s_bal_2orders;	/* 2^order hits */1621	atomic_t s_bal_p2_aligned_bad_suggestions;1622	atomic_t s_bal_goal_fast_bad_suggestions;1623	atomic_t s_bal_best_avail_bad_suggestions;1624	atomic64_t s_bal_cX_groups_considered[EXT4_MB_NUM_CRS];1625	atomic64_t s_bal_cX_hits[EXT4_MB_NUM_CRS];1626	atomic64_t s_bal_cX_failed[EXT4_MB_NUM_CRS];		/* cX loop didn't find blocks */1627	atomic_t s_mb_buddies_generated;	/* number of buddies generated */1628	atomic64_t s_mb_generation_time;1629	atomic_t s_mb_lost_chunks;1630	atomic_t s_mb_preallocated;1631	atomic_t s_mb_discarded;1632	atomic_t s_lock_busy;1633 1634	/* locality groups */1635	struct ext4_locality_group __percpu *s_locality_groups;1636 1637	/* for write statistics */1638	unsigned long s_sectors_written_start;1639	u64 s_kbytes_written;1640 1641	/* the size of zero-out chunk */1642	unsigned int s_extent_max_zeroout_kb;1643 1644	unsigned int s_log_groups_per_flex;1645	struct flex_groups * __rcu *s_flex_groups;1646	ext4_group_t s_flex_groups_allocated;1647 1648	/* workqueue for reserved extent conversions (buffered io) */1649	struct workqueue_struct *rsv_conversion_wq;1650 1651	/* timer for periodic error stats printing */1652	struct timer_list s_err_report;1653 1654	/* Lazy inode table initialization info */1655	struct ext4_li_request *s_li_request;1656	/* Wait multiplier for lazy initialization thread */1657	unsigned int s_li_wait_mult;1658 1659	/* Kernel thread for multiple mount protection */1660	struct task_struct *s_mmp_tsk;1661 1662	/* record the last minlen when FITRIM is called. */1663	unsigned long s_last_trim_minblks;1664 1665	/* Reference to checksum algorithm driver via cryptoapi */1666	struct crypto_shash *s_chksum_driver;1667 1668	/* Precomputed FS UUID checksum for seeding other checksums */1669	__u32 s_csum_seed;1670 1671	/* Reclaim extents from extent status tree */1672	struct shrinker *s_es_shrinker;1673	struct list_head s_es_list;	/* List of inodes with reclaimable extents */1674	long s_es_nr_inode;1675	struct ext4_es_stats s_es_stats;1676	struct mb_cache *s_ea_block_cache;1677	struct mb_cache *s_ea_inode_cache;1678	spinlock_t s_es_lock ____cacheline_aligned_in_smp;1679 1680	/* Journal triggers for checksum computation */1681	struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT];1682 1683	/* Ratelimit ext4 messages. */1684	struct ratelimit_state s_err_ratelimit_state;1685	struct ratelimit_state s_warning_ratelimit_state;1686	struct ratelimit_state s_msg_ratelimit_state;1687	atomic_t s_warning_count;1688	atomic_t s_msg_count;1689 1690	/* Encryption policy for '-o test_dummy_encryption' */1691	struct fscrypt_dummy_policy s_dummy_enc_policy;1692 1693	/*1694	 * Barrier between writepages ops and changing any inode's JOURNAL_DATA1695	 * or EXTENTS flag or between writepages ops and changing DELALLOC or1696	 * DIOREAD_NOLOCK mount options on remount.1697	 */1698	struct percpu_rw_semaphore s_writepages_rwsem;1699	struct dax_device *s_daxdev;1700	u64 s_dax_part_off;1701#ifdef CONFIG_EXT4_DEBUG1702	unsigned long s_simulate_fail;1703#endif1704	/* Record the errseq of the backing block device */1705	errseq_t s_bdev_wb_err;1706	spinlock_t s_bdev_wb_lock;1707 1708	/* Information about errors that happened during this mount */1709	spinlock_t s_error_lock;1710	int s_add_error_count;1711	int s_first_error_code;1712	__u32 s_first_error_line;1713	__u32 s_first_error_ino;1714	__u64 s_first_error_block;1715	const char *s_first_error_func;1716	time64_t s_first_error_time;1717	int s_last_error_code;1718	__u32 s_last_error_line;1719	__u32 s_last_error_ino;1720	__u64 s_last_error_block;1721	const char *s_last_error_func;1722	time64_t s_last_error_time;1723	/*1724	 * If we are in a context where we cannot update the on-disk1725	 * superblock, we queue the work here.  This is used to update1726	 * the error information in the superblock, and for periodic1727	 * updates of the superblock called from the commit callback1728	 * function.1729	 */1730	struct work_struct s_sb_upd_work;1731 1732	/* Ext4 fast commit sub transaction ID */1733	atomic_t s_fc_subtid;1734 1735	/*1736	 * After commit starts, the main queue gets locked, and the further1737	 * updates get added in the staging queue.1738	 */1739#define FC_Q_MAIN	01740#define FC_Q_STAGING	11741	struct list_head s_fc_q[2];	/* Inodes staged for fast commit1742					 * that have data changes in them.1743					 */1744	struct list_head s_fc_dentry_q[2];	/* directory entry updates */1745	unsigned int s_fc_bytes;1746	/*1747	 * Main fast commit lock. This lock protects accesses to the1748	 * following fields:1749	 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.1750	 */1751	spinlock_t s_fc_lock;1752	struct buffer_head *s_fc_bh;1753	struct ext4_fc_stats s_fc_stats;1754	tid_t s_fc_ineligible_tid;1755#ifdef CONFIG_EXT4_DEBUG1756	int s_fc_debug_max_replay;1757#endif1758	struct ext4_fc_replay_state s_fc_replay_state;1759};1760 1761static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)1762{1763	return sb->s_fs_info;1764}1765static inline struct ext4_inode_info *EXT4_I(struct inode *inode)1766{1767	return container_of(inode, struct ext4_inode_info, vfs_inode);1768}1769 1770static inline int ext4_writepages_down_read(struct super_block *sb)1771{1772	percpu_down_read(&EXT4_SB(sb)->s_writepages_rwsem);1773	return memalloc_nofs_save();1774}1775 1776static inline void ext4_writepages_up_read(struct super_block *sb, int ctx)1777{1778	memalloc_nofs_restore(ctx);1779	percpu_up_read(&EXT4_SB(sb)->s_writepages_rwsem);1780}1781 1782static inline int ext4_writepages_down_write(struct super_block *sb)1783{1784	percpu_down_write(&EXT4_SB(sb)->s_writepages_rwsem);1785	return memalloc_nofs_save();1786}1787 1788static inline void ext4_writepages_up_write(struct super_block *sb, int ctx)1789{1790	memalloc_nofs_restore(ctx);1791	percpu_up_write(&EXT4_SB(sb)->s_writepages_rwsem);1792}1793 1794static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)1795{1796	return ino == EXT4_ROOT_INO ||1797		(ino >= EXT4_FIRST_INO(sb) &&1798		 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));1799}1800 1801/*1802 * Returns: sbi->field[index]1803 * Used to access an array element from the following sbi fields which require1804 * rcu protection to avoid dereferencing an invalid pointer due to reassignment1805 * - s_group_desc1806 * - s_group_info1807 * - s_flex_group1808 */1809#define sbi_array_rcu_deref(sbi, field, index)				   \1810({									   \1811	typeof(*((sbi)->field)) _v;					   \1812	rcu_read_lock();						   \1813	_v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index];	   \1814	rcu_read_unlock();						   \1815	_v;								   \1816})1817 1818/*1819 * run-time mount flags1820 */1821enum {1822	EXT4_MF_MNTDIR_SAMPLED,1823	EXT4_MF_FC_INELIGIBLE	/* Fast commit ineligible */1824};1825 1826static inline void ext4_set_mount_flag(struct super_block *sb, int bit)1827{1828	set_bit(bit, &EXT4_SB(sb)->s_mount_flags);1829}1830 1831static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)1832{1833	clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);1834}1835 1836static inline int ext4_test_mount_flag(struct super_block *sb, int bit)1837{1838	return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);1839}1840 1841 1842/*1843 * Simulate_fail codes1844 */1845#define EXT4_SIM_BBITMAP_EIO	11846#define EXT4_SIM_BBITMAP_CRC	21847#define EXT4_SIM_IBITMAP_EIO	31848#define EXT4_SIM_IBITMAP_CRC	41849#define EXT4_SIM_INODE_EIO	51850#define EXT4_SIM_INODE_CRC	61851#define EXT4_SIM_DIRBLOCK_EIO	71852#define EXT4_SIM_DIRBLOCK_CRC	81853 1854static inline bool ext4_simulate_fail(struct super_block *sb,1855				     unsigned long code)1856{1857#ifdef CONFIG_EXT4_DEBUG1858	struct ext4_sb_info *sbi = EXT4_SB(sb);1859 1860	if (unlikely(sbi->s_simulate_fail == code)) {1861		sbi->s_simulate_fail = 0;1862		return true;1863	}1864#endif1865	return false;1866}1867 1868static inline void ext4_simulate_fail_bh(struct super_block *sb,1869					 struct buffer_head *bh,1870					 unsigned long code)1871{1872	if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))1873		clear_buffer_uptodate(bh);1874}1875 1876/*1877 * Error number codes for s_{first,last}_error_errno1878 *1879 * Linux errno numbers are architecture specific, so we need to translate1880 * them into something which is architecture independent.   We don't define1881 * codes for all errno's; just the ones which are most likely to be the cause1882 * of an ext4_error() call.1883 */1884#define EXT4_ERR_UNKNOWN	 11885#define EXT4_ERR_EIO		 21886#define EXT4_ERR_ENOMEM		 31887#define EXT4_ERR_EFSBADCRC	 41888#define EXT4_ERR_EFSCORRUPTED	 51889#define EXT4_ERR_ENOSPC		 61890#define EXT4_ERR_ENOKEY		 71891#define EXT4_ERR_EROFS		 81892#define EXT4_ERR_EFBIG		 91893#define EXT4_ERR_EEXIST		101894#define EXT4_ERR_ERANGE		111895#define EXT4_ERR_EOVERFLOW	121896#define EXT4_ERR_EBUSY		131897#define EXT4_ERR_ENOTDIR	141898#define EXT4_ERR_ENOTEMPTY	151899#define EXT4_ERR_ESHUTDOWN	161900#define EXT4_ERR_EFAULT		171901 1902/*1903 * Inode dynamic state flags1904 */1905enum {1906	EXT4_STATE_NEW,			/* inode is newly created */1907	EXT4_STATE_XATTR,		/* has in-inode xattrs */1908	EXT4_STATE_NO_EXPAND,		/* No space for expansion */1909	EXT4_STATE_DA_ALLOC_CLOSE,	/* Alloc DA blks on close */1910	EXT4_STATE_EXT_MIGRATE,		/* Inode is migrating */1911	EXT4_STATE_NEWENTRY,		/* File just added to dir */1912	EXT4_STATE_MAY_INLINE_DATA,	/* may have in-inode data */1913	EXT4_STATE_EXT_PRECACHED,	/* extents have been precached */1914	EXT4_STATE_LUSTRE_EA_INODE,	/* Lustre-style ea_inode */1915	EXT4_STATE_VERITY_IN_PROGRESS,	/* building fs-verity Merkle tree */1916	EXT4_STATE_FC_COMMITTING,	/* Fast commit ongoing */1917	EXT4_STATE_ORPHAN_FILE,		/* Inode orphaned in orphan file */1918};1919 1920#define EXT4_INODE_BIT_FNS(name, field, offset)				\1921static inline int ext4_test_inode_##name(struct inode *inode, int bit)	\1922{									\1923	return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);	\1924}									\1925static inline void ext4_set_inode_##name(struct inode *inode, int bit)	\1926{									\1927	set_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\1928}									\1929static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \1930{									\1931	clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);		\1932}1933 1934/* Add these declarations here only so that these functions can be1935 * found by name.  Otherwise, they are very hard to locate. */1936static inline int ext4_test_inode_flag(struct inode *inode, int bit);1937static inline void ext4_set_inode_flag(struct inode *inode, int bit);1938static inline void ext4_clear_inode_flag(struct inode *inode, int bit);1939EXT4_INODE_BIT_FNS(flag, flags, 0)1940 1941/* Add these declarations here only so that these functions can be1942 * found by name.  Otherwise, they are very hard to locate. */1943static inline int ext4_test_inode_state(struct inode *inode, int bit);1944static inline void ext4_set_inode_state(struct inode *inode, int bit);1945static inline void ext4_clear_inode_state(struct inode *inode, int bit);1946#if (BITS_PER_LONG < 64)1947EXT4_INODE_BIT_FNS(state, state_flags, 0)1948 1949static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)1950{1951	(ei)->i_state_flags = 0;1952}1953#else1954EXT4_INODE_BIT_FNS(state, flags, 32)1955 1956static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)1957{1958	/* We depend on the fact that callers will set i_flags */1959}1960#endif1961#else1962/* Assume that user mode programs are passing in an ext4fs superblock, not1963 * a kernel struct super_block.  This will allow us to call the feature-test1964 * macros from user land. */1965#define EXT4_SB(sb)	(sb)1966#endif1967 1968static inline bool ext4_verity_in_progress(struct inode *inode)1969{1970	return IS_ENABLED(CONFIG_FS_VERITY) &&1971	       ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);1972}1973 1974#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime1975 1976/*1977 * Codes for operating systems1978 */1979#define EXT4_OS_LINUX		01980#define EXT4_OS_HURD		11981#define EXT4_OS_MASIX		21982#define EXT4_OS_FREEBSD		31983#define EXT4_OS_LITES		41984 1985/*1986 * Revision levels1987 */1988#define EXT4_GOOD_OLD_REV	0	/* The good old (original) format */1989#define EXT4_DYNAMIC_REV	1	/* V2 format w/ dynamic inode sizes */1990 1991#define EXT4_MAX_SUPP_REV	EXT4_DYNAMIC_REV1992 1993#define EXT4_GOOD_OLD_INODE_SIZE 1281994 1995#define EXT4_EXTRA_TIMESTAMP_MAX	(((s64)1 << 34) - 1  + S32_MIN)1996#define EXT4_NON_EXTRA_TIMESTAMP_MAX	S32_MAX1997#define EXT4_TIMESTAMP_MIN		S32_MIN1998 1999/*2000 * Feature set definitions2001 */2002 2003#define EXT4_FEATURE_COMPAT_DIR_PREALLOC	0x00012004#define EXT4_FEATURE_COMPAT_IMAGIC_INODES	0x00022005#define EXT4_FEATURE_COMPAT_HAS_JOURNAL		0x00042006#define EXT4_FEATURE_COMPAT_EXT_ATTR		0x00082007#define EXT4_FEATURE_COMPAT_RESIZE_INODE	0x00102008#define EXT4_FEATURE_COMPAT_DIR_INDEX		0x00202009#define EXT4_FEATURE_COMPAT_SPARSE_SUPER2	0x02002010/*2011 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes2012 * incompatible only if fast commit blocks are present in the FS. Since we2013 * clear the journal (and thus the fast commit blocks), we don't mark FS as2014 * incompatible. We also have a JBD2 incompat feature, which gets set when2015 * there are fast commit blocks present in the journal.2016 */2017#define EXT4_FEATURE_COMPAT_FAST_COMMIT		0x04002018#define EXT4_FEATURE_COMPAT_STABLE_INODES	0x08002019#define EXT4_FEATURE_COMPAT_ORPHAN_FILE		0x1000	/* Orphan file exists */2020 2021#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER	0x00012022#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE	0x00022023#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR	0x00042024#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x00082025#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM		0x00102026#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK	0x00202027#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE	0x00402028#define EXT4_FEATURE_RO_COMPAT_QUOTA		0x01002029#define EXT4_FEATURE_RO_COMPAT_BIGALLOC		0x02002030/*2031 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When2032 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as2033 * all other data structures' checksums.  However, the METADATA_CSUM and2034 * GDT_CSUM bits are mutually exclusive.2035 */2036#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM	0x04002037#define EXT4_FEATURE_RO_COMPAT_READONLY		0x10002038#define EXT4_FEATURE_RO_COMPAT_PROJECT		0x20002039#define EXT4_FEATURE_RO_COMPAT_VERITY		0x80002040#define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT	0x10000 /* Orphan file may be2041							   non-empty */2042 2043#define EXT4_FEATURE_INCOMPAT_COMPRESSION	0x00012044#define EXT4_FEATURE_INCOMPAT_FILETYPE		0x00022045#define EXT4_FEATURE_INCOMPAT_RECOVER		0x0004 /* Needs recovery */2046#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV	0x0008 /* Journal device */2047#define EXT4_FEATURE_INCOMPAT_META_BG		0x00102048#define EXT4_FEATURE_INCOMPAT_EXTENTS		0x0040 /* extents support */2049#define EXT4_FEATURE_INCOMPAT_64BIT		0x00802050#define EXT4_FEATURE_INCOMPAT_MMP               0x01002051#define EXT4_FEATURE_INCOMPAT_FLEX_BG		0x02002052#define EXT4_FEATURE_INCOMPAT_EA_INODE		0x0400 /* EA in inode */2053#define EXT4_FEATURE_INCOMPAT_DIRDATA		0x1000 /* data in dirent */2054#define EXT4_FEATURE_INCOMPAT_CSUM_SEED		0x20002055#define EXT4_FEATURE_INCOMPAT_LARGEDIR		0x4000 /* >2GB or 3-lvl htree */2056#define EXT4_FEATURE_INCOMPAT_INLINE_DATA	0x8000 /* data in inode */2057#define EXT4_FEATURE_INCOMPAT_ENCRYPT		0x100002058#define EXT4_FEATURE_INCOMPAT_CASEFOLD		0x200002059 2060extern void ext4_update_dynamic_rev(struct super_block *sb);2061 2062#define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \2063static inline bool ext4_has_feature_##name(struct super_block *sb) \2064{ \2065	return ((EXT4_SB(sb)->s_es->s_feature_compat & \2066		cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \2067} \2068static inline void ext4_set_feature_##name(struct super_block *sb) \2069{ \2070	ext4_update_dynamic_rev(sb); \2071	EXT4_SB(sb)->s_es->s_feature_compat |= \2072		cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \2073} \2074static inline void ext4_clear_feature_##name(struct super_block *sb) \2075{ \2076	EXT4_SB(sb)->s_es->s_feature_compat &= \2077		~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \2078}2079 2080#define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \2081static inline bool ext4_has_feature_##name(struct super_block *sb) \2082{ \2083	return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \2084		cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \2085} \2086static inline void ext4_set_feature_##name(struct super_block *sb) \2087{ \2088	ext4_update_dynamic_rev(sb); \2089	EXT4_SB(sb)->s_es->s_feature_ro_compat |= \2090		cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \2091} \2092static inline void ext4_clear_feature_##name(struct super_block *sb) \2093{ \2094	EXT4_SB(sb)->s_es->s_feature_ro_compat &= \2095		~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \2096}2097 2098#define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \2099static inline bool ext4_has_feature_##name(struct super_block *sb) \2100{ \2101	return ((EXT4_SB(sb)->s_es->s_feature_incompat & \2102		cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \2103} \2104static inline void ext4_set_feature_##name(struct super_block *sb) \2105{ \2106	ext4_update_dynamic_rev(sb); \2107	EXT4_SB(sb)->s_es->s_feature_incompat |= \2108		cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \2109} \2110static inline void ext4_clear_feature_##name(struct super_block *sb) \2111{ \2112	EXT4_SB(sb)->s_es->s_feature_incompat &= \2113		~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \2114}2115 2116EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,		DIR_PREALLOC)2117EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,	IMAGIC_INODES)2118EXT4_FEATURE_COMPAT_FUNCS(journal,		HAS_JOURNAL)2119EXT4_FEATURE_COMPAT_FUNCS(xattr,		EXT_ATTR)2120EXT4_FEATURE_COMPAT_FUNCS(resize_inode,		RESIZE_INODE)2121EXT4_FEATURE_COMPAT_FUNCS(dir_index,		DIR_INDEX)2122EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,	SPARSE_SUPER2)2123EXT4_FEATURE_COMPAT_FUNCS(fast_commit,		FAST_COMMIT)2124EXT4_FEATURE_COMPAT_FUNCS(stable_inodes,	STABLE_INODES)2125EXT4_FEATURE_COMPAT_FUNCS(orphan_file,		ORPHAN_FILE)2126 2127EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,	SPARSE_SUPER)2128EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,	LARGE_FILE)2129EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,		BTREE_DIR)2130EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,		HUGE_FILE)2131EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,		GDT_CSUM)2132EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,		DIR_NLINK)2133EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,	EXTRA_ISIZE)2134EXT4_FEATURE_RO_COMPAT_FUNCS(quota,		QUOTA)2135EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,		BIGALLOC)2136EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,	METADATA_CSUM)2137EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,		READONLY)2138EXT4_FEATURE_RO_COMPAT_FUNCS(project,		PROJECT)2139EXT4_FEATURE_RO_COMPAT_FUNCS(verity,		VERITY)2140EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present,	ORPHAN_PRESENT)2141 2142EXT4_FEATURE_INCOMPAT_FUNCS(compression,	COMPRESSION)2143EXT4_FEATURE_INCOMPAT_FUNCS(filetype,		FILETYPE)2144EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,	RECOVER)2145EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,	JOURNAL_DEV)2146EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,		META_BG)2147EXT4_FEATURE_INCOMPAT_FUNCS(extents,		EXTENTS)2148EXT4_FEATURE_INCOMPAT_FUNCS(64bit,		64BIT)2149EXT4_FEATURE_INCOMPAT_FUNCS(mmp,		MMP)2150EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,		FLEX_BG)2151EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,		EA_INODE)2152EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,		DIRDATA)2153EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,		CSUM_SEED)2154EXT4_FEATURE_INCOMPAT_FUNCS(largedir,		LARGEDIR)2155EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,	INLINE_DATA)2156EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,		ENCRYPT)2157EXT4_FEATURE_INCOMPAT_FUNCS(casefold,		CASEFOLD)2158 2159#define EXT2_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR2160#define EXT2_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \2161					 EXT4_FEATURE_INCOMPAT_META_BG)2162#define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \2163					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \2164					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)2165 2166#define EXT3_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR2167#define EXT3_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \2168					 EXT4_FEATURE_INCOMPAT_RECOVER| \2169					 EXT4_FEATURE_INCOMPAT_META_BG)2170#define EXT3_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \2171					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \2172					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)2173 2174#define EXT4_FEATURE_COMPAT_SUPP	(EXT4_FEATURE_COMPAT_EXT_ATTR| \2175					 EXT4_FEATURE_COMPAT_ORPHAN_FILE)2176#define EXT4_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \2177					 EXT4_FEATURE_INCOMPAT_RECOVER| \2178					 EXT4_FEATURE_INCOMPAT_META_BG| \2179					 EXT4_FEATURE_INCOMPAT_EXTENTS| \2180					 EXT4_FEATURE_INCOMPAT_64BIT| \2181					 EXT4_FEATURE_INCOMPAT_FLEX_BG| \2182					 EXT4_FEATURE_INCOMPAT_EA_INODE| \2183					 EXT4_FEATURE_INCOMPAT_MMP | \2184					 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \2185					 EXT4_FEATURE_INCOMPAT_ENCRYPT | \2186					 EXT4_FEATURE_INCOMPAT_CASEFOLD | \2187					 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \2188					 EXT4_FEATURE_INCOMPAT_LARGEDIR)2189#define EXT4_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \2190					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \2191					 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \2192					 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \2193					 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \2194					 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\2195					 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\2196					 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\2197					 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\2198					 EXT4_FEATURE_RO_COMPAT_QUOTA |\2199					 EXT4_FEATURE_RO_COMPAT_PROJECT |\2200					 EXT4_FEATURE_RO_COMPAT_VERITY |\2201					 EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT)2202 2203#define EXTN_FEATURE_FUNCS(ver) \2204static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \2205{ \2206	return ((EXT4_SB(sb)->s_es->s_feature_compat & \2207		cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \2208} \2209static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \2210{ \2211	return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \2212		cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \2213} \2214static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \2215{ \2216	return ((EXT4_SB(sb)->s_es->s_feature_incompat & \2217		cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \2218}2219 2220EXTN_FEATURE_FUNCS(2)2221EXTN_FEATURE_FUNCS(3)2222EXTN_FEATURE_FUNCS(4)2223 2224static inline bool ext4_has_compat_features(struct super_block *sb)2225{2226	return (EXT4_SB(sb)->s_es->s_feature_compat != 0);2227}2228static inline bool ext4_has_ro_compat_features(struct super_block *sb)2229{2230	return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);2231}2232static inline bool ext4_has_incompat_features(struct super_block *sb)2233{2234	return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);2235}2236 2237extern int ext4_feature_set_ok(struct super_block *sb, int readonly);2238 2239/*2240 * Superblock flags2241 */2242#define EXT4_FLAGS_RESIZING	02243#define EXT4_FLAGS_SHUTDOWN	12244#define EXT4_FLAGS_BDEV_IS_DAX	22245 2246static inline int ext4_forced_shutdown(struct super_block *sb)2247{2248	return test_bit(EXT4_FLAGS_SHUTDOWN, &EXT4_SB(sb)->s_ext4_flags);2249}2250 2251/*2252 * Default values for user and/or group using reserved blocks2253 */2254#define	EXT4_DEF_RESUID		02255#define	EXT4_DEF_RESGID		02256 2257/*2258 * Default project ID2259 */2260#define	EXT4_DEF_PROJID		02261 2262#define EXT4_DEF_INODE_READAHEAD_BLKS	322263 2264/*2265 * Default mount options2266 */2267#define EXT4_DEFM_DEBUG		0x00012268#define EXT4_DEFM_BSDGROUPS	0x00022269#define EXT4_DEFM_XATTR_USER	0x00042270#define EXT4_DEFM_ACL		0x00082271#define EXT4_DEFM_UID16		0x00102272#define EXT4_DEFM_JMODE		0x00602273#define EXT4_DEFM_JMODE_DATA	0x00202274#define EXT4_DEFM_JMODE_ORDERED	0x00402275#define EXT4_DEFM_JMODE_WBACK	0x00602276#define EXT4_DEFM_NOBARRIER	0x01002277#define EXT4_DEFM_BLOCK_VALIDITY 0x02002278#define EXT4_DEFM_DISCARD	0x04002279#define EXT4_DEFM_NODELALLOC	0x08002280 2281/*2282 * Default journal batch times2283 */2284#define EXT4_DEF_MIN_BATCH_TIME	02285#define EXT4_DEF_MAX_BATCH_TIME	15000 /* 15ms */2286 2287/*2288 * Minimum number of groups in a flexgroup before we separate out2289 * directories into the first block group of a flexgroup2290 */2291#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME	42292 2293/*2294 * Structure of a directory entry2295 */2296#define EXT4_NAME_LEN 2552297/*2298 * Base length of the ext4 directory entry excluding the name length2299 */2300#define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN)2301 2302struct ext4_dir_entry {2303	__le32	inode;			/* Inode number */2304	__le16	rec_len;		/* Directory entry length */2305	__le16	name_len;		/* Name length */2306	char	name[EXT4_NAME_LEN];	/* File name */2307};2308 2309 2310/*2311 * Encrypted Casefolded entries require saving the hash on disk. This structure2312 * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned2313 * boundary.2314 */2315struct ext4_dir_entry_hash {2316	__le32 hash;2317	__le32 minor_hash;2318};2319 2320/*2321 * The new version of the directory entry.  Since EXT4 structures are2322 * stored in intel byte order, and the name_len field could never be2323 * bigger than 255 chars, it's safe to reclaim the extra byte for the2324 * file_type field.2325 */2326struct ext4_dir_entry_2 {2327	__le32	inode;			/* Inode number */2328	__le16	rec_len;		/* Directory entry length */2329	__u8	name_len;		/* Name length */2330	__u8	file_type;		/* See file type macros EXT4_FT_* below */2331	char	name[EXT4_NAME_LEN];	/* File name */2332};2333 2334/*2335 * Access the hashes at the end of ext4_dir_entry_22336 */2337#define EXT4_DIRENT_HASHES(entry) \2338	((struct ext4_dir_entry_hash *) \2339		(((void *)(entry)) + \2340		((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)))2341#define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(entry)->hash)2342#define EXT4_DIRENT_MINOR_HASH(entry) \2343		le32_to_cpu(EXT4_DIRENT_HASHES(entry)->minor_hash)2344 2345static inline bool ext4_hash_in_dirent(const struct inode *inode)2346{2347	return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode);2348}2349 2350/*2351 * This is a bogus directory entry at the end of each leaf block that2352 * records checksums.2353 */2354struct ext4_dir_entry_tail {2355	__le32	det_reserved_zero1;	/* Pretend to be unused */2356	__le16	det_rec_len;		/* 12 */2357	__u8	det_reserved_zero2;	/* Zero name length */2358	__u8	det_reserved_ft;	/* 0xDE, fake file type */2359	__le32	det_checksum;		/* crc32c(uuid+inum+dirblock) */2360};2361 2362#define EXT4_DIRENT_TAIL(block, blocksize) \2363	((struct ext4_dir_entry_tail *)(((void *)(block)) + \2364					((blocksize) - \2365					 sizeof(struct ext4_dir_entry_tail))))2366 2367/*2368 * Ext4 directory file types.  Only the low 3 bits are used.  The2369 * other bits are reserved for now.2370 */2371#define EXT4_FT_UNKNOWN		02372#define EXT4_FT_REG_FILE	12373#define EXT4_FT_DIR		22374#define EXT4_FT_CHRDEV		32375#define EXT4_FT_BLKDEV		42376#define EXT4_FT_FIFO		52377#define EXT4_FT_SOCK		62378#define EXT4_FT_SYMLINK		72379 2380#define EXT4_FT_MAX		82381 2382#define EXT4_FT_DIR_CSUM	0xDE2383 2384/*2385 * EXT4_DIR_PAD defines the directory entries boundaries2386 *2387 * NOTE: It must be a multiple of 42388 */2389#define EXT4_DIR_PAD			42390#define EXT4_DIR_ROUND			(EXT4_DIR_PAD - 1)2391#define EXT4_MAX_REC_LEN		((1<<16)-1)2392 2393/*2394 * The rec_len is dependent on the type of directory. Directories that are2395 * casefolded and encrypted need to store the hash as well, so we add room for2396 * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should2397 * pass NULL for dir, as those entries do not use the extra fields.2398 */2399static inline unsigned int ext4_dir_rec_len(__u8 name_len,2400						const struct inode *dir)2401{2402	int rec_len = (name_len + 8 + EXT4_DIR_ROUND);2403 2404	if (dir && ext4_hash_in_dirent(dir))2405		rec_len += sizeof(struct ext4_dir_entry_hash);2406	return (rec_len & ~EXT4_DIR_ROUND);2407}2408 2409/*2410 * If we ever get support for fs block sizes > page_size, we'll need2411 * to remove the #if statements in the next two functions...2412 */2413static inline unsigned int2414ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)2415{2416	unsigned len = le16_to_cpu(dlen);2417 2418#if (PAGE_SIZE >= 65536)2419	if (len == EXT4_MAX_REC_LEN || len == 0)2420		return blocksize;2421	return (len & 65532) | ((len & 3) << 16);2422#else2423	return len;2424#endif2425}2426 2427static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)2428{2429	BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3));2430#if (PAGE_SIZE >= 65536)2431	if (len < 65536)2432		return cpu_to_le16(len);2433	if (len == blocksize) {2434		if (blocksize == 65536)2435			return cpu_to_le16(EXT4_MAX_REC_LEN);2436		else2437			return cpu_to_le16(0);2438	}2439	return cpu_to_le16((len & 65532) | ((len >> 16) & 3));2440#else2441	return cpu_to_le16(len);2442#endif2443}2444 2445/*2446 * Hash Tree Directory indexing2447 * (c) Daniel Phillips, 20012448 */2449 2450#define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \2451		    ext4_test_inode_flag((dir), EXT4_INODE_INDEX))2452#define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \2453		    !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))2454#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)2455 2456/* Legal values for the dx_root hash_version field: */2457 2458#define DX_HASH_LEGACY			02459#define DX_HASH_HALF_MD4		12460#define DX_HASH_TEA			22461#define DX_HASH_LEGACY_UNSIGNED		32462#define DX_HASH_HALF_MD4_UNSIGNED	42463#define DX_HASH_TEA_UNSIGNED		52464#define DX_HASH_SIPHASH			62465#define DX_HASH_LAST 			DX_HASH_SIPHASH2466 2467static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,2468			      const void *address, unsigned int length)2469{2470	struct {2471		struct shash_desc shash;2472		char ctx[4];2473	} desc;2474 2475	BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));2476 2477	desc.shash.tfm = sbi->s_chksum_driver;2478	*(u32 *)desc.ctx = crc;2479 2480	BUG_ON(crypto_shash_update(&desc.shash, address, length));2481 2482	return *(u32 *)desc.ctx;2483}2484 2485#ifdef __KERNEL__2486 2487/* hash info structure used by the directory hash */2488struct dx_hash_info2489{2490	u32		hash;2491	u32		minor_hash;2492	int		hash_version;2493	u32		*seed;2494};2495 2496 2497/* 32 and 64 bit signed EOF for dx directories */2498#define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)2499#define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)2500 2501 2502/*2503 * Control parameters used by ext4_htree_next_block2504 */2505#define HASH_NB_ALWAYS		12506 2507struct ext4_filename {2508	const struct qstr *usr_fname;2509	struct fscrypt_str disk_name;2510	struct dx_hash_info hinfo;2511#ifdef CONFIG_FS_ENCRYPTION2512	struct fscrypt_str crypto_buf;2513#endif2514#if IS_ENABLED(CONFIG_UNICODE)2515	struct qstr cf_name;2516#endif2517};2518 2519#define fname_name(p) ((p)->disk_name.name)2520#define fname_usr_name(p) ((p)->usr_fname->name)2521#define fname_len(p)  ((p)->disk_name.len)2522 2523/*2524 * Describe an inode's exact location on disk and in memory2525 */2526struct ext4_iloc2527{2528	struct buffer_head *bh;2529	unsigned long offset;2530	ext4_group_t block_group;2531};2532 2533static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)2534{2535	return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);2536}2537 2538static inline bool ext4_is_quota_file(struct inode *inode)2539{2540	return IS_NOQUOTA(inode) &&2541	       !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);2542}2543 2544/*2545 * This structure is stuffed into the struct file's private_data field2546 * for directories.  It is where we put information so that we can do2547 * readdir operations in hash tree order.2548 */2549struct dir_private_info {2550	struct rb_root	root;2551	struct rb_node	*curr_node;2552	struct fname	*extra_fname;2553	loff_t		last_pos;2554	__u32		curr_hash;2555	__u32		curr_minor_hash;2556	__u32		next_hash;2557	u64		cookie;2558	bool		initialized;2559};2560 2561/* calculate the first block number of the group */2562static inline ext4_fsblk_t2563ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)2564{2565	return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +2566		le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);2567}2568 2569/*2570 * Special error return code only used by dx_probe() and its callers.2571 */2572#define ERR_BAD_DX_DIR	(-(MAX_ERRNO - 1))2573 2574/* htree levels for ext4 */2575#define	EXT4_HTREE_LEVEL_COMPAT	22576#define	EXT4_HTREE_LEVEL	32577 2578static inline int ext4_dir_htree_level(struct super_block *sb)2579{2580	return ext4_has_feature_largedir(sb) ?2581		EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;2582}2583 2584/*2585 * Timeout and state flag for lazy initialization inode thread.2586 */2587#define EXT4_DEF_LI_WAIT_MULT			102588#define EXT4_DEF_LI_MAX_START_DELAY		52589#define EXT4_LAZYINIT_QUIT			0x00012590#define EXT4_LAZYINIT_RUNNING			0x00022591 2592/*2593 * Lazy inode table initialization info2594 */2595struct ext4_lazy_init {2596	unsigned long		li_state;2597	struct list_head	li_request_list;2598	struct mutex		li_list_mtx;2599};2600 2601enum ext4_li_mode {2602	EXT4_LI_MODE_PREFETCH_BBITMAP,2603	EXT4_LI_MODE_ITABLE,2604};2605 2606struct ext4_li_request {2607	struct super_block	*lr_super;2608	enum ext4_li_mode	lr_mode;2609	ext4_group_t		lr_first_not_zeroed;2610	ext4_group_t		lr_next_group;2611	struct list_head	lr_request;2612	unsigned long		lr_next_sched;2613	unsigned long		lr_timeout;2614};2615 2616struct ext4_features {2617	struct kobject f_kobj;2618	struct completion f_kobj_unregister;2619};2620 2621/*2622 * This structure will be used for multiple mount protection. It will be2623 * written into the block number saved in the s_mmp_block field in the2624 * superblock. Programs that check MMP should assume that if2625 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe2626 * to use the filesystem, regardless of how old the timestamp is.2627 */2628#define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */2629#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */2630#define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */2631#define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */2632 2633struct mmp_struct {2634	__le32	mmp_magic;		/* Magic number for MMP */2635	__le32	mmp_seq;		/* Sequence no. updated periodically */2636 2637	/*2638	 * mmp_time, mmp_nodename & mmp_bdevname are only used for information2639	 * purposes and do not affect the correctness of the algorithm2640	 */2641	__le64	mmp_time;		/* Time last updated */2642	char	mmp_nodename[64];	/* Node which last updated MMP block */2643	char	mmp_bdevname[32];	/* Bdev which last updated MMP block */2644 2645	/*2646	 * mmp_check_interval is used to verify if the MMP block has been2647	 * updated on the block device. The value is updated based on the2648	 * maximum time to write the MMP block during an update cycle.2649	 */2650	__le16	mmp_check_interval;2651 2652	__le16	mmp_pad1;2653	__le32	mmp_pad2[226];2654	__le32	mmp_checksum;		/* crc32c(uuid+mmp_block) */2655};2656 2657/* arguments passed to the mmp thread */2658struct mmpd_data {2659	struct buffer_head *bh; /* bh from initial read_mmp_block() */2660	struct super_block *sb;  /* super block of the fs */2661};2662 2663/*2664 * Check interval multiplier2665 * The MMP block is written every update interval and initially checked every2666 * update interval x the multiplier (the value is then adapted based on the2667 * write latency). The reason is that writes can be delayed under load and we2668 * don't want readers to incorrectly assume that the filesystem is no longer2669 * in use.2670 */2671#define EXT4_MMP_CHECK_MULT		2UL2672 2673/*2674 * Minimum interval for MMP checking in seconds.2675 */2676#define EXT4_MMP_MIN_CHECK_INTERVAL	5UL2677 2678/*2679 * Maximum interval for MMP checking in seconds.2680 */2681#define EXT4_MMP_MAX_CHECK_INTERVAL	300UL2682 2683/*2684 * Function prototypes2685 */2686 2687/*2688 * Ok, these declarations are also in <linux/kernel.h> but none of the2689 * ext4 source programs needs to include it so they are duplicated here.2690 */2691# define NORET_TYPE	/**/2692# define ATTRIB_NORET	__attribute__((noreturn))2693# define NORET_AND	noreturn,2694 2695/* bitmap.c */2696extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);2697void ext4_inode_bitmap_csum_set(struct super_block *sb,2698				struct ext4_group_desc *gdp,2699				struct buffer_head *bh);2700int ext4_inode_bitmap_csum_verify(struct super_block *sb,2701				  struct ext4_group_desc *gdp,2702				  struct buffer_head *bh);2703void ext4_block_bitmap_csum_set(struct super_block *sb,2704				struct ext4_group_desc *gdp,2705				struct buffer_head *bh);2706int ext4_block_bitmap_csum_verify(struct super_block *sb,2707				  struct ext4_group_desc *gdp,2708				  struct buffer_head *bh);2709 2710/* balloc.c */2711extern void ext4_get_group_no_and_offset(struct super_block *sb,2712					 ext4_fsblk_t blocknr,2713					 ext4_group_t *blockgrpp,2714					 ext4_grpblk_t *offsetp);2715extern ext4_group_t ext4_get_group_number(struct super_block *sb,2716					  ext4_fsblk_t block);2717 2718extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);2719extern unsigned long ext4_bg_num_gdb(struct super_block *sb,2720			ext4_group_t group);2721extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,2722					 ext4_fsblk_t goal,2723					 unsigned int flags,2724					 unsigned long *count,2725					 int *errp);2726extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,2727				    s64 nclusters, unsigned int flags);2728extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);2729extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,2730						    ext4_group_t block_group,2731						    struct buffer_head ** bh);2732extern struct ext4_group_info *ext4_get_group_info(struct super_block *sb,2733						   ext4_group_t group);2734extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);2735 2736extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,2737						ext4_group_t block_group,2738						bool ignore_locked);2739extern int ext4_wait_block_bitmap(struct super_block *sb,2740				  ext4_group_t block_group,2741				  struct buffer_head *bh);2742extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,2743						  ext4_group_t block_group);2744extern unsigned ext4_free_clusters_after_init(struct super_block *sb,2745					      ext4_group_t block_group,2746					      struct ext4_group_desc *gdp);2747ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);2748 2749#if IS_ENABLED(CONFIG_UNICODE)2750extern int ext4_fname_setup_ci_filename(struct inode *dir,2751					const struct qstr *iname,2752					struct ext4_filename *fname);2753 2754static inline void ext4_fname_free_ci_filename(struct ext4_filename *fname)2755{2756	kfree(fname->cf_name.name);2757	fname->cf_name.name = NULL;2758}2759#else2760static inline int ext4_fname_setup_ci_filename(struct inode *dir,2761					       const struct qstr *iname,2762					       struct ext4_filename *fname)2763{2764	return 0;2765}2766 2767static inline void ext4_fname_free_ci_filename(struct ext4_filename *fname)2768{2769}2770#endif2771 2772/* ext4 encryption related stuff goes here crypto.c */2773#ifdef CONFIG_FS_ENCRYPTION2774extern const struct fscrypt_operations ext4_cryptops;2775 2776int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,2777			      int lookup, struct ext4_filename *fname);2778 2779int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry,2780			      struct ext4_filename *fname);2781 2782void ext4_fname_free_filename(struct ext4_filename *fname);2783 2784int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg);2785 2786#else /* !CONFIG_FS_ENCRYPTION */2787static inline int ext4_fname_setup_filename(struct inode *dir,2788					    const struct qstr *iname,2789					    int lookup,2790					    struct ext4_filename *fname)2791{2792	fname->usr_fname = iname;2793	fname->disk_name.name = (unsigned char *) iname->name;2794	fname->disk_name.len = iname->len;2795 2796	return ext4_fname_setup_ci_filename(dir, iname, fname);2797}2798 2799static inline int ext4_fname_prepare_lookup(struct inode *dir,2800					    struct dentry *dentry,2801					    struct ext4_filename *fname)2802{2803	return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);2804}2805 2806static inline void ext4_fname_free_filename(struct ext4_filename *fname)2807{2808	ext4_fname_free_ci_filename(fname);2809}2810 2811static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp,2812						   void __user *arg)2813{2814	return -EOPNOTSUPP;2815}2816#endif /* !CONFIG_FS_ENCRYPTION */2817 2818/* dir.c */2819extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,2820				  struct file *,2821				  struct ext4_dir_entry_2 *,2822				  struct buffer_head *, char *, int,2823				  unsigned int);2824#define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \2825	unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \2826				(de), (bh), (buf), (size), (offset)))2827extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,2828				__u32 minor_hash,2829				struct ext4_dir_entry_2 *dirent,2830				struct fscrypt_str *ent_name);2831extern void ext4_htree_free_dir_info(struct dir_private_info *p);2832extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,2833			     struct buffer_head *bh,2834			     void *buf, int buf_size,2835			     struct ext4_filename *fname,2836			     struct ext4_dir_entry_2 **dest_de);2837void ext4_insert_dentry(struct inode *dir, struct inode *inode,2838			struct ext4_dir_entry_2 *de,2839			int buf_size,2840			struct ext4_filename *fname);2841static inline void ext4_update_dx_flag(struct inode *inode)2842{2843	if (!ext4_has_feature_dir_index(inode->i_sb) &&2844	    ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {2845		/* ext4_iget() should have caught this... */2846		WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));2847		ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);2848	}2849}2850static const unsigned char ext4_filetype_table[] = {2851	DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK2852};2853 2854static inline  unsigned char get_dtype(struct super_block *sb, int filetype)2855{2856	if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)2857		return DT_UNKNOWN;2858 2859	return ext4_filetype_table[filetype];2860}2861extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,2862			     void *buf, int buf_size);2863 2864/* fsync.c */2865extern int ext4_sync_file(struct file *, loff_t, loff_t, int);2866 2867/* hash.c */2868extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,2869			  struct dx_hash_info *hinfo);2870 2871/* ialloc.c */2872extern int ext4_mark_inode_used(struct super_block *sb, int ino);2873extern struct inode *__ext4_new_inode(struct mnt_idmap *, handle_t *,2874				      struct inode *, umode_t,2875				      const struct qstr *qstr, __u32 goal,2876				      uid_t *owner, __u32 i_flags,2877				      int handle_type, unsigned int line_no,2878				      int nblocks);2879 2880#define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags)          \2881	__ext4_new_inode(&nop_mnt_idmap, (handle), (dir), (mode), (qstr),      \2882			 (goal), (owner), i_flags, 0, 0, 0)2883#define ext4_new_inode_start_handle(idmap, dir, mode, qstr, goal, owner, \2884				    type, nblocks)		    \2885	__ext4_new_inode((idmap), NULL, (dir), (mode), (qstr), (goal), (owner), \2886			 0, (type), __LINE__, (nblocks))2887 2888 2889extern void ext4_free_inode(handle_t *, struct inode *);2890extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);2891extern unsigned long ext4_count_free_inodes(struct super_block *);2892extern unsigned long ext4_count_dirs(struct super_block *);2893extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);2894extern int ext4_init_inode_table(struct super_block *sb,2895				 ext4_group_t group, int barrier);2896extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);2897 2898/* fast_commit.c */2899int ext4_fc_info_show(struct seq_file *seq, void *v);2900void ext4_fc_init(struct super_block *sb, journal_t *journal);2901void ext4_fc_init_inode(struct inode *inode);2902void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,2903			 ext4_lblk_t end);2904void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,2905	struct dentry *dentry);2906void __ext4_fc_track_link(handle_t *handle, struct inode *inode,2907	struct dentry *dentry);2908void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);2909void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);2910void __ext4_fc_track_create(handle_t *handle, struct inode *inode,2911			    struct dentry *dentry);2912void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);2913void ext4_fc_track_inode(handle_t *handle, struct inode *inode);2914void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle);2915void ext4_fc_start_update(struct inode *inode);2916void ext4_fc_stop_update(struct inode *inode);2917void ext4_fc_del(struct inode *inode);2918bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);2919void ext4_fc_replay_cleanup(struct super_block *sb);2920int ext4_fc_commit(journal_t *journal, tid_t commit_tid);2921int __init ext4_fc_init_dentry_cache(void);2922void ext4_fc_destroy_dentry_cache(void);2923int ext4_fc_record_regions(struct super_block *sb, int ino,2924			   ext4_lblk_t lblk, ext4_fsblk_t pblk,2925			   int len, int replay);2926 2927/* mballoc.c */2928extern const struct seq_operations ext4_mb_seq_groups_ops;2929extern const struct seq_operations ext4_mb_seq_structs_summary_ops;2930extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);2931extern int ext4_mb_init(struct super_block *);2932extern void ext4_mb_release(struct super_block *);2933extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,2934				struct ext4_allocation_request *, int *);2935extern void ext4_discard_preallocations(struct inode *);2936extern int __init ext4_init_mballoc(void);2937extern void ext4_exit_mballoc(void);2938extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,2939				     ext4_group_t group,2940				     unsigned int nr, int *cnt);2941extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,2942				  unsigned int nr);2943 2944extern void ext4_free_blocks(handle_t *handle, struct inode *inode,2945			     struct buffer_head *bh, ext4_fsblk_t block,2946			     unsigned long count, int flags);2947extern int ext4_mb_alloc_groupinfo(struct super_block *sb,2948				   ext4_group_t ngroups);2949extern int ext4_mb_add_groupinfo(struct super_block *sb,2950		ext4_group_t i, struct ext4_group_desc *desc);2951extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,2952				ext4_fsblk_t block, unsigned long count);2953extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);2954extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);2955extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,2956			    int len, bool state);2957static inline bool ext4_mb_cr_expensive(enum criteria cr)2958{2959	return cr >= CR_GOAL_LEN_SLOW;2960}2961 2962/* inode.c */2963void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,2964			 struct ext4_inode_info *ei);2965int ext4_inode_is_fast_symlink(struct inode *inode);2966struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);2967struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);2968int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,2969		     bool wait, struct buffer_head **bhs);2970int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,2971			     struct buffer_head *bh_result, int create);2972int ext4_get_block(struct inode *inode, sector_t iblock,2973		   struct buffer_head *bh_result, int create);2974int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,2975			   struct buffer_head *bh, int create);2976int ext4_walk_page_buffers(handle_t *handle,2977			   struct inode *inode,2978			   struct buffer_head *head,2979			   unsigned from,2980			   unsigned to,2981			   int *partial,2982			   int (*fn)(handle_t *handle, struct inode *inode,2983				     struct buffer_head *bh));2984int do_journal_get_write_access(handle_t *handle, struct inode *inode,2985				struct buffer_head *bh);2986#define FALL_BACK_TO_NONDELALLOC 12987#define CONVERT_INLINE_DATA	 22988 2989typedef enum {2990	EXT4_IGET_NORMAL =	0,2991	EXT4_IGET_SPECIAL =	0x0001, /* OK to iget a system inode */2992	EXT4_IGET_HANDLE = 	0x0002,	/* Inode # is from a handle */2993	EXT4_IGET_BAD =		0x0004, /* Allow to iget a bad inode */2994	EXT4_IGET_EA_INODE =	0x0008	/* Inode should contain an EA value */2995} ext4_iget_flags;2996 2997extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,2998				 ext4_iget_flags flags, const char *function,2999				 unsigned int line);3000 3001#define ext4_iget(sb, ino, flags) \3002	__ext4_iget((sb), (ino), (flags), __func__, __LINE__)3003 3004extern int  ext4_write_inode(struct inode *, struct writeback_control *);3005extern int  ext4_setattr(struct mnt_idmap *, struct dentry *,3006			 struct iattr *);3007extern u32  ext4_dio_alignment(struct inode *inode);3008extern int  ext4_getattr(struct mnt_idmap *, const struct path *,3009			 struct kstat *, u32, unsigned int);3010extern void ext4_evict_inode(struct inode *);3011extern void ext4_clear_inode(struct inode *);3012extern int  ext4_file_getattr(struct mnt_idmap *, const struct path *,3013			      struct kstat *, u32, unsigned int);3014extern void ext4_dirty_inode(struct inode *, int);3015extern int ext4_change_inode_journal_flag(struct inode *, int);3016extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);3017extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,3018			  struct ext4_iloc *iloc);3019extern int ext4_inode_attach_jinode(struct inode *inode);3020extern int ext4_can_truncate(struct inode *inode);3021extern int ext4_truncate(struct inode *);3022extern int ext4_break_layouts(struct inode *);3023extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);3024extern void ext4_set_inode_flags(struct inode *, bool init);3025extern int ext4_alloc_da_blocks(struct inode *inode);3026extern void ext4_set_aops(struct inode *inode);3027extern int ext4_writepage_trans_blocks(struct inode *);3028extern int ext4_normal_submit_inode_data_buffers(struct jbd2_inode *jinode);3029extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);3030extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,3031			     loff_t lstart, loff_t lend);3032extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);3033extern qsize_t *ext4_get_reserved_space(struct inode *inode);3034extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);3035extern void ext4_da_release_space(struct inode *inode, int to_free);3036extern void ext4_da_update_reserve_space(struct inode *inode,3037					int used, int quota_claim);3038extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,3039			      ext4_fsblk_t pblk, ext4_lblk_t len);3040 3041/* indirect.c */3042extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,3043				struct ext4_map_blocks *map, int flags);3044extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);3045extern void ext4_ind_truncate(handle_t *, struct inode *inode);3046extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,3047				 ext4_lblk_t start, ext4_lblk_t end);3048 3049/* ioctl.c */3050extern long ext4_ioctl(struct file *, unsigned int, unsigned long);3051extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);3052int ext4_fileattr_set(struct mnt_idmap *idmap,3053		      struct dentry *dentry, struct fileattr *fa);3054int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);3055extern void ext4_reset_inode_seed(struct inode *inode);3056int ext4_update_overhead(struct super_block *sb, bool force);3057int ext4_force_shutdown(struct super_block *sb, u32 flags);3058 3059/* migrate.c */3060extern int ext4_ext_migrate(struct inode *);3061extern int ext4_ind_migrate(struct inode *inode);3062 3063/* namei.c */3064extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,3065			     struct inode *inode);3066extern int ext4_dirblock_csum_verify(struct inode *inode,3067				     struct buffer_head *bh);3068extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,3069				__u32 start_minor_hash, __u32 *next_hash);3070extern int ext4_search_dir(struct buffer_head *bh,3071			   char *search_buf,3072			   int buf_size,3073			   struct inode *dir,3074			   struct ext4_filename *fname,3075			   unsigned int offset,3076			   struct ext4_dir_entry_2 **res_dir);3077extern int ext4_generic_delete_entry(struct inode *dir,3078				     struct ext4_dir_entry_2 *de_del,3079				     struct buffer_head *bh,3080				     void *entry_buf,3081				     int buf_size,3082				     int csum_size);3083extern bool ext4_empty_dir(struct inode *inode);3084 3085/* resize.c */3086extern void ext4_kvfree_array_rcu(void *to_free);3087extern int ext4_group_add(struct super_block *sb,3088				struct ext4_new_group_data *input);3089extern int ext4_group_extend(struct super_block *sb,3090				struct ext4_super_block *es,3091				ext4_fsblk_t n_blocks_count);3092extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);3093extern unsigned int ext4_list_backups(struct super_block *sb,3094				      unsigned int *three, unsigned int *five,3095				      unsigned int *seven);3096 3097/* super.c */3098extern struct buffer_head *ext4_sb_bread(struct super_block *sb,3099					 sector_t block, blk_opf_t op_flags);3100extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,3101						   sector_t block);3102extern void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags,3103				bh_end_io_t *end_io);3104extern int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags,3105			bh_end_io_t *end_io);3106extern int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait);3107extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);3108extern int ext4_seq_options_show(struct seq_file *seq, void *offset);3109extern int ext4_calculate_overhead(struct super_block *sb);3110extern __le32 ext4_superblock_csum(struct super_block *sb,3111				   struct ext4_super_block *es);3112extern void ext4_superblock_csum_set(struct super_block *sb);3113extern int ext4_alloc_flex_bg_array(struct super_block *sb,3114				    ext4_group_t ngroup);3115extern const char *ext4_decode_error(struct super_block *sb, int errno,3116				     char nbuf[16]);3117extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,3118					     ext4_group_t block_group,3119					     unsigned int flags);3120extern unsigned int ext4_num_base_meta_blocks(struct super_block *sb,3121					      ext4_group_t block_group);3122 3123extern __printf(7, 8)3124void __ext4_error(struct super_block *, const char *, unsigned int, bool,3125		  int, __u64, const char *, ...);3126extern __printf(6, 7)3127void __ext4_error_inode(struct inode *, const char *, unsigned int,3128			ext4_fsblk_t, int, const char *, ...);3129extern __printf(5, 6)3130void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,3131		     const char *, ...);3132extern void __ext4_std_error(struct super_block *, const char *,3133			     unsigned int, int);3134extern __printf(4, 5)3135void __ext4_warning(struct super_block *, const char *, unsigned int,3136		    const char *, ...);3137extern __printf(4, 5)3138void __ext4_warning_inode(const struct inode *inode, const char *function,3139			  unsigned int line, const char *fmt, ...);3140extern __printf(3, 4)3141void __ext4_msg(struct super_block *, const char *, const char *, ...);3142extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,3143			   const char *, unsigned int, const char *);3144extern __printf(7, 8)3145void __ext4_grp_locked_error(const char *, unsigned int,3146			     struct super_block *, ext4_group_t,3147			     unsigned long, ext4_fsblk_t,3148			     const char *, ...);3149 3150#define EXT4_ERROR_INODE(inode, fmt, a...) \3151	ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)3152 3153#define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...)			\3154	__ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)3155 3156#define ext4_error_inode_block(inode, block, err, fmt, a...)		\3157	__ext4_error_inode((inode), __func__, __LINE__, (block), (err),	\3158			   (fmt), ## a)3159 3160#define EXT4_ERROR_FILE(file, block, fmt, a...)				\3161	ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)3162 3163#define ext4_abort(sb, err, fmt, a...)					\3164	__ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)3165 3166#ifdef CONFIG_PRINTK3167 3168#define ext4_error_inode(inode, func, line, block, fmt, ...)		\3169	__ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)3170#define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)	\3171	__ext4_error_inode((inode), (func), (line), (block), 		\3172			   (err), (fmt), ##__VA_ARGS__)3173#define ext4_error_file(file, func, line, block, fmt, ...)		\3174	__ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)3175#define ext4_error(sb, fmt, ...)					\3176	__ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt),	\3177		##__VA_ARGS__)3178#define ext4_error_err(sb, err, fmt, ...)				\3179	__ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt),	\3180		##__VA_ARGS__)3181#define ext4_warning(sb, fmt, ...)					\3182	__ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)3183#define ext4_warning_inode(inode, fmt, ...)				\3184	__ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)3185#define ext4_msg(sb, level, fmt, ...)				\3186	__ext4_msg(sb, level, fmt, ##__VA_ARGS__)3187#define dump_mmp_msg(sb, mmp, msg)					\3188	__dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)3189#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)		\3190	__ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \3191				fmt, ##__VA_ARGS__)3192 3193#else3194 3195#define ext4_error_inode(inode, func, line, block, fmt, ...)		\3196do {									\3197	no_printk(fmt, ##__VA_ARGS__);					\3198	__ext4_error_inode(inode, "", 0, block, 0, " ");		\3199} while (0)3200#define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)	\3201do {									\3202	no_printk(fmt, ##__VA_ARGS__);					\3203	__ext4_error_inode(inode, "", 0, block, err, " ");		\3204} while (0)3205#define ext4_error_file(file, func, line, block, fmt, ...)		\3206do {									\3207	no_printk(fmt, ##__VA_ARGS__);					\3208	__ext4_error_file(file, "", 0, block, " ");			\3209} while (0)3210#define ext4_error(sb, fmt, ...)					\3211do {									\3212	no_printk(fmt, ##__VA_ARGS__);					\3213	__ext4_error(sb, "", 0, false, 0, 0, " ");			\3214} while (0)3215#define ext4_error_err(sb, err, fmt, ...)				\3216do {									\3217	no_printk(fmt, ##__VA_ARGS__);					\3218	__ext4_error(sb, "", 0, false, err, 0, " ");			\3219} while (0)3220#define ext4_warning(sb, fmt, ...)					\3221do {									\3222	no_printk(fmt, ##__VA_ARGS__);					\3223	__ext4_warning(sb, "", 0, " ");					\3224} while (0)3225#define ext4_warning_inode(inode, fmt, ...)				\3226do {									\3227	no_printk(fmt, ##__VA_ARGS__);					\3228	__ext4_warning_inode(inode, "", 0, " ");			\3229} while (0)3230#define ext4_msg(sb, level, fmt, ...)					\3231do {									\3232	no_printk(fmt, ##__VA_ARGS__);					\3233	__ext4_msg(sb, "", " ");					\3234} while (0)3235#define dump_mmp_msg(sb, mmp, msg)					\3236	__dump_mmp_msg(sb, mmp, "", 0, "")3237#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)		\3238do {									\3239	no_printk(fmt, ##__VA_ARGS__);				\3240	__ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");	\3241} while (0)3242 3243#endif3244 3245extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,3246				      struct ext4_group_desc *bg);3247extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,3248				      struct ext4_group_desc *bg);3249extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,3250				     struct ext4_group_desc *bg);3251extern __u32 ext4_free_group_clusters(struct super_block *sb,3252				      struct ext4_group_desc *bg);3253extern __u32 ext4_free_inodes_count(struct super_block *sb,3254				 struct ext4_group_desc *bg);3255extern __u32 ext4_used_dirs_count(struct super_block *sb,3256				struct ext4_group_desc *bg);3257extern __u32 ext4_itable_unused_count(struct super_block *sb,3258				   struct ext4_group_desc *bg);3259extern void ext4_block_bitmap_set(struct super_block *sb,3260				  struct ext4_group_desc *bg, ext4_fsblk_t blk);3261extern void ext4_inode_bitmap_set(struct super_block *sb,3262				  struct ext4_group_desc *bg, ext4_fsblk_t blk);3263extern void ext4_inode_table_set(struct super_block *sb,3264				 struct ext4_group_desc *bg, ext4_fsblk_t blk);3265extern void ext4_free_group_clusters_set(struct super_block *sb,3266					 struct ext4_group_desc *bg,3267					 __u32 count);3268extern void ext4_free_inodes_set(struct super_block *sb,3269				struct ext4_group_desc *bg, __u32 count);3270extern void ext4_used_dirs_set(struct super_block *sb,3271				struct ext4_group_desc *bg, __u32 count);3272extern void ext4_itable_unused_set(struct super_block *sb,3273				   struct ext4_group_desc *bg, __u32 count);3274extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,3275				       struct ext4_group_desc *gdp);3276extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,3277				     struct ext4_group_desc *gdp);3278extern int ext4_register_li_request(struct super_block *sb,3279				    ext4_group_t first_not_zeroed);3280 3281static inline int ext4_has_metadata_csum(struct super_block *sb)3282{3283	WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&3284		     !EXT4_SB(sb)->s_chksum_driver);3285 3286	return ext4_has_feature_metadata_csum(sb) &&3287	       (EXT4_SB(sb)->s_chksum_driver != NULL);3288}3289 3290static inline int ext4_has_group_desc_csum(struct super_block *sb)3291{3292	return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);3293}3294 3295#define ext4_read_incompat_64bit_val(es, name) \3296	(((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \3297		? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \3298		le32_to_cpu(es->name##_lo))3299 3300static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)3301{3302	return ext4_read_incompat_64bit_val(es, s_blocks_count);3303}3304 3305static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)3306{3307	return ext4_read_incompat_64bit_val(es, s_r_blocks_count);3308}3309 3310static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)3311{3312	return ext4_read_incompat_64bit_val(es, s_free_blocks_count);3313}3314 3315static inline void ext4_blocks_count_set(struct ext4_super_block *es,3316					 ext4_fsblk_t blk)3317{3318	es->s_blocks_count_lo = cpu_to_le32((u32)blk);3319	es->s_blocks_count_hi = cpu_to_le32(blk >> 32);3320}3321 3322static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,3323					      ext4_fsblk_t blk)3324{3325	es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);3326	es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);3327}3328 3329static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,3330					   ext4_fsblk_t blk)3331{3332	es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);3333	es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);3334}3335 3336static inline loff_t ext4_isize(struct super_block *sb,3337				struct ext4_inode *raw_inode)3338{3339	if (ext4_has_feature_largedir(sb) ||3340	    S_ISREG(le16_to_cpu(raw_inode->i_mode)))3341		return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |3342			le32_to_cpu(raw_inode->i_size_lo);3343 3344	return (loff_t) le32_to_cpu(raw_inode->i_size_lo);3345}3346 3347static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)3348{3349	raw_inode->i_size_lo = cpu_to_le32(i_size);3350	raw_inode->i_size_high = cpu_to_le32(i_size >> 32);3351}3352 3353/*3354 * Reading s_groups_count requires using smp_rmb() afterwards.  See3355 * the locking protocol documented in the comments of ext4_group_add()3356 * in resize.c3357 */3358static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)3359{3360	ext4_group_t	ngroups = EXT4_SB(sb)->s_groups_count;3361 3362	smp_rmb();3363	return ngroups;3364}3365 3366static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,3367					     ext4_group_t block_group)3368{3369	return block_group >> sbi->s_log_groups_per_flex;3370}3371 3372static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)3373{3374	return 1 << sbi->s_log_groups_per_flex;3375}3376 3377#define ext4_std_error(sb, errno)				\3378do {								\3379	if ((errno))						\3380		__ext4_std_error((sb), __func__, __LINE__, (errno));	\3381} while (0)3382 3383#ifdef CONFIG_SMP3384/* Each CPU can accumulate percpu_counter_batch clusters in their local3385 * counters. So we need to make sure we have free clusters more3386 * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.3387 */3388#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))3389#else3390#define EXT4_FREECLUSTERS_WATERMARK 03391#endif3392 3393/* Update i_disksize. Requires i_rwsem to avoid races with truncate */3394static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)3395{3396	WARN_ON_ONCE(S_ISREG(inode->i_mode) &&3397		     !inode_is_locked(inode));3398	down_write(&EXT4_I(inode)->i_data_sem);3399	if (newsize > EXT4_I(inode)->i_disksize)3400		WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);3401	up_write(&EXT4_I(inode)->i_data_sem);3402}3403 3404/* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */3405static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)3406{3407	int changed = 0;3408 3409	if (newsize > inode->i_size) {3410		i_size_write(inode, newsize);3411		changed = 1;3412	}3413	if (newsize > EXT4_I(inode)->i_disksize) {3414		ext4_update_i_disksize(inode, newsize);3415		changed |= 2;3416	}3417	return changed;3418}3419 3420int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,3421				      loff_t len);3422 3423struct ext4_group_info {3424	unsigned long   bb_state;3425#ifdef AGGRESSIVE_CHECK3426	unsigned long	bb_check_counter;3427#endif3428	struct rb_root  bb_free_root;3429	ext4_grpblk_t	bb_first_free;	/* first free block */3430	ext4_grpblk_t	bb_free;	/* total free blocks */3431	ext4_grpblk_t	bb_fragments;	/* nr of freespace fragments */3432	int		bb_avg_fragment_size_order;	/* order of average3433							   fragment in BG */3434	ext4_grpblk_t	bb_largest_free_order;/* order of largest frag in BG */3435	ext4_group_t	bb_group;	/* Group number */3436	struct          list_head bb_prealloc_list;3437#ifdef DOUBLE_CHECK3438	void            *bb_bitmap;3439#endif3440	struct rw_semaphore alloc_sem;3441	struct list_head bb_avg_fragment_size_node;3442	struct list_head bb_largest_free_order_node;3443	ext4_grpblk_t	bb_counters[];	/* Nr of free power-of-two-block3444					 * regions, index is order.3445					 * bb_counters[3] = 5 means3446					 * 5 free 8-block regions. */3447};3448 3449#define EXT4_GROUP_INFO_NEED_INIT_BIT		03450#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT		13451#define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT	23452#define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT	33453#define EXT4_GROUP_INFO_BBITMAP_CORRUPT		\3454	(1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)3455#define EXT4_GROUP_INFO_IBITMAP_CORRUPT		\3456	(1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)3457#define EXT4_GROUP_INFO_BBITMAP_READ_BIT	43458 3459#define EXT4_MB_GRP_NEED_INIT(grp)	\3460	(test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))3461#define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)	\3462	(test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))3463#define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)	\3464	(test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))3465 3466#define EXT4_MB_GRP_WAS_TRIMMED(grp)	\3467	(test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))3468#define EXT4_MB_GRP_SET_TRIMMED(grp)	\3469	(set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))3470#define EXT4_MB_GRP_CLEAR_TRIMMED(grp)	\3471	(clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))3472#define EXT4_MB_GRP_TEST_AND_SET_READ(grp)	\3473	(test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))3474 3475#define EXT4_MAX_CONTENTION		83476#define EXT4_CONTENTION_THRESHOLD	23477 3478static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,3479					      ext4_group_t group)3480{3481	return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);3482}3483 3484/*3485 * Returns true if the filesystem is busy enough that attempts to3486 * access the block group locks has run into contention.3487 */3488static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)3489{3490	return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);3491}3492 3493static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)3494{3495	spinlock_t *lock = ext4_group_lock_ptr(sb, group);3496	if (spin_trylock(lock))3497		/*3498		 * We're able to grab the lock right away, so drop the3499		 * lock contention counter.3500		 */3501		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);3502	else {3503		/*3504		 * The lock is busy, so bump the contention counter,3505		 * and then wait on the spin lock.3506		 */3507		atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,3508				  EXT4_MAX_CONTENTION);3509		spin_lock(lock);3510	}3511}3512 3513static inline void ext4_unlock_group(struct super_block *sb,3514					ext4_group_t group)3515{3516	spin_unlock(ext4_group_lock_ptr(sb, group));3517}3518 3519#ifdef CONFIG_QUOTA3520static inline bool ext4_quota_capable(struct super_block *sb)3521{3522	return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));3523}3524 3525static inline bool ext4_is_quota_journalled(struct super_block *sb)3526{3527	struct ext4_sb_info *sbi = EXT4_SB(sb);3528 3529	return (ext4_has_feature_quota(sb) ||3530		sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);3531}3532int ext4_enable_quotas(struct super_block *sb);3533#endif3534 3535/*3536 * Block validity checking3537 */3538#define ext4_check_indirect_blockref(inode, bh)				\3539	ext4_check_blockref(__func__, __LINE__, inode,			\3540			    (__le32 *)(bh)->b_data,			\3541			    EXT4_ADDR_PER_BLOCK((inode)->i_sb))3542 3543#define ext4_ind_check_inode(inode)					\3544	ext4_check_blockref(__func__, __LINE__, inode,			\3545			    EXT4_I(inode)->i_data,			\3546			    EXT4_NDIR_BLOCKS)3547 3548/*3549 * Inodes and files operations3550 */3551 3552/* dir.c */3553extern const struct file_operations ext4_dir_operations;3554 3555/* file.c */3556extern const struct inode_operations ext4_file_inode_operations;3557extern const struct file_operations ext4_file_operations;3558extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);3559 3560/* inline.c */3561extern int ext4_get_max_inline_size(struct inode *inode);3562extern int ext4_find_inline_data_nolock(struct inode *inode);3563extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);3564 3565int ext4_readpage_inline(struct inode *inode, struct folio *folio);3566extern int ext4_try_to_write_inline_data(struct address_space *mapping,3567					 struct inode *inode,3568					 loff_t pos, unsigned len,3569					 struct folio **foliop);3570int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,3571			       unsigned copied, struct folio *folio);3572extern int ext4_da_write_inline_data_begin(struct address_space *mapping,3573					   struct inode *inode,3574					   loff_t pos, unsigned len,3575					   struct folio **foliop,3576					   void **fsdata);3577extern int ext4_try_add_inline_entry(handle_t *handle,3578				     struct ext4_filename *fname,3579				     struct inode *dir, struct inode *inode);3580extern int ext4_try_create_inline_dir(handle_t *handle,3581				      struct inode *parent,3582				      struct inode *inode);3583extern int ext4_read_inline_dir(struct file *filp,3584				struct dir_context *ctx,3585				int *has_inline_data);3586extern int ext4_inlinedir_to_tree(struct file *dir_file,3587				  struct inode *dir, ext4_lblk_t block,3588				  struct dx_hash_info *hinfo,3589				  __u32 start_hash, __u32 start_minor_hash,3590				  int *has_inline_data);3591extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,3592					struct ext4_filename *fname,3593					struct ext4_dir_entry_2 **res_dir,3594					int *has_inline_data);3595extern int ext4_delete_inline_entry(handle_t *handle,3596				    struct inode *dir,3597				    struct ext4_dir_entry_2 *de_del,3598				    struct buffer_head *bh,3599				    int *has_inline_data);3600extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);3601extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,3602					struct ext4_dir_entry_2 **parent_de,3603					int *retval);3604extern void *ext4_read_inline_link(struct inode *inode);3605 3606struct iomap;3607extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);3608 3609extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);3610 3611extern int ext4_convert_inline_data(struct inode *inode);3612 3613static inline int ext4_has_inline_data(struct inode *inode)3614{3615	return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&3616	       EXT4_I(inode)->i_inline_off;3617}3618 3619/* namei.c */3620extern const struct inode_operations ext4_dir_inode_operations;3621extern const struct inode_operations ext4_special_inode_operations;3622extern struct dentry *ext4_get_parent(struct dentry *child);3623extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,3624				 struct ext4_dir_entry_2 *de,3625				 int blocksize, int csum_size,3626				 unsigned int parent_ino, int dotdot_real_len);3627extern void ext4_initialize_dirent_tail(struct buffer_head *bh,3628					unsigned int blocksize);3629extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,3630				      struct buffer_head *bh);3631extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name,3632			 struct inode *inode, struct dentry *dentry);3633extern int __ext4_link(struct inode *dir, struct inode *inode,3634		       struct dentry *dentry);3635 3636#define S_SHIFT 123637static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {3638	[S_IFREG >> S_SHIFT]	= EXT4_FT_REG_FILE,3639	[S_IFDIR >> S_SHIFT]	= EXT4_FT_DIR,3640	[S_IFCHR >> S_SHIFT]	= EXT4_FT_CHRDEV,3641	[S_IFBLK >> S_SHIFT]	= EXT4_FT_BLKDEV,3642	[S_IFIFO >> S_SHIFT]	= EXT4_FT_FIFO,3643	[S_IFSOCK >> S_SHIFT]	= EXT4_FT_SOCK,3644	[S_IFLNK >> S_SHIFT]	= EXT4_FT_SYMLINK,3645};3646 3647static inline void ext4_set_de_type(struct super_block *sb,3648				struct ext4_dir_entry_2 *de,3649				umode_t mode) {3650	if (ext4_has_feature_filetype(sb))3651		de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];3652}3653 3654/* readpages.c */3655extern int ext4_mpage_readpages(struct inode *inode,3656		struct readahead_control *rac, struct folio *folio);3657extern int __init ext4_init_post_read_processing(void);3658extern void ext4_exit_post_read_processing(void);3659 3660/* symlink.c */3661extern const struct inode_operations ext4_encrypted_symlink_inode_operations;3662extern const struct inode_operations ext4_symlink_inode_operations;3663extern const struct inode_operations ext4_fast_symlink_inode_operations;3664 3665/* sysfs.c */3666extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);3667extern int ext4_register_sysfs(struct super_block *sb);3668extern void ext4_unregister_sysfs(struct super_block *sb);3669extern int __init ext4_init_sysfs(void);3670extern void ext4_exit_sysfs(void);3671 3672/* block_validity */3673extern void ext4_release_system_zone(struct super_block *sb);3674extern int ext4_setup_system_zone(struct super_block *sb);3675extern int __init ext4_init_system_zone(void);3676extern void ext4_exit_system_zone(void);3677extern int ext4_inode_block_valid(struct inode *inode,3678				  ext4_fsblk_t start_blk,3679				  unsigned int count);3680extern int ext4_check_blockref(const char *, unsigned int,3681			       struct inode *, __le32 *, unsigned int);3682extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode,3683				ext4_fsblk_t start_blk, unsigned int count);3684 3685 3686/* extents.c */3687struct ext4_ext_path;3688struct ext4_extent;3689 3690/*3691 * Maximum number of logical blocks in a file; ext4_extent's ee_block is3692 * __le32.3693 */3694#define EXT_MAX_BLOCKS	0xffffffff3695 3696extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);3697extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);3698extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,3699			       struct ext4_map_blocks *map, int flags);3700extern int ext4_ext_truncate(handle_t *, struct inode *);3701extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,3702				 ext4_lblk_t end);3703extern void ext4_ext_init(struct super_block *);3704extern void ext4_ext_release(struct super_block *);3705extern long ext4_fallocate(struct file *file, int mode, loff_t offset,3706			  loff_t len);3707extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,3708					  loff_t offset, ssize_t len);3709extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,3710					     ext4_io_end_t *io_end);3711extern int ext4_map_blocks(handle_t *handle, struct inode *inode,3712			   struct ext4_map_blocks *map, int flags);3713extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,3714						   int num,3715						   struct ext4_ext_path *path);3716extern struct ext4_ext_path *ext4_ext_insert_extent(3717				handle_t *handle, struct inode *inode,3718				struct ext4_ext_path *path,3719				struct ext4_extent *newext, int gb_flags);3720extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,3721					      struct ext4_ext_path *,3722					      int flags);3723extern void ext4_free_ext_path(struct ext4_ext_path *);3724extern int ext4_ext_check_inode(struct inode *inode);3725extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);3726extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,3727			__u64 start, __u64 len);3728extern int ext4_get_es_cache(struct inode *inode,3729			     struct fiemap_extent_info *fieinfo,3730			     __u64 start, __u64 len);3731extern int ext4_ext_precache(struct inode *inode);3732extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,3733				struct inode *inode2, ext4_lblk_t lblk1,3734			     ext4_lblk_t lblk2,  ext4_lblk_t count,3735			     int mark_unwritten,int *err);3736extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);3737extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,3738				       int check_cred, int restart_cred,3739				       int revoke_cred);3740extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);3741extern int ext4_ext_replay_set_iblocks(struct inode *inode);3742extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,3743		int len, int unwritten, ext4_fsblk_t pblk);3744extern int ext4_ext_clear_bb(struct inode *inode);3745 3746 3747/* move_extent.c */3748extern void ext4_double_down_write_data_sem(struct inode *first,3749					    struct inode *second);3750extern void ext4_double_up_write_data_sem(struct inode *orig_inode,3751					  struct inode *donor_inode);3752extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,3753			     __u64 start_orig, __u64 start_donor,3754			     __u64 len, __u64 *moved_len);3755 3756/* page-io.c */3757extern int __init ext4_init_pageio(void);3758extern void ext4_exit_pageio(void);3759extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);3760extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);3761extern int ext4_put_io_end(ext4_io_end_t *io_end);3762extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);3763extern void ext4_io_submit_init(struct ext4_io_submit *io,3764				struct writeback_control *wbc);3765extern void ext4_end_io_rsv_work(struct work_struct *work);3766extern void ext4_io_submit(struct ext4_io_submit *io);3767int ext4_bio_write_folio(struct ext4_io_submit *io, struct folio *page,3768		size_t len);3769extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);3770extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);3771 3772/* mmp.c */3773extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);3774 3775/* mmp.c */3776extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);3777 3778/* verity.c */3779extern const struct fsverity_operations ext4_verityops;3780 3781/* orphan.c */3782extern int ext4_orphan_add(handle_t *, struct inode *);3783extern int ext4_orphan_del(handle_t *, struct inode *);3784extern void ext4_orphan_cleanup(struct super_block *sb,3785				struct ext4_super_block *es);3786extern void ext4_release_orphan_info(struct super_block *sb);3787extern int ext4_init_orphan_info(struct super_block *sb);3788extern int ext4_orphan_file_empty(struct super_block *sb);3789extern void ext4_orphan_file_block_trigger(3790				struct jbd2_buffer_trigger_type *triggers,3791				struct buffer_head *bh,3792				void *data, size_t size);3793 3794/*3795 * Add new method to test whether block and inode bitmaps are properly3796 * initialized. With uninit_bg reading the block from disk is not enough3797 * to mark the bitmap uptodate. We need to also zero-out the bitmap3798 */3799#define BH_BITMAP_UPTODATE BH_JBDPrivateStart3800 3801static inline int bitmap_uptodate(struct buffer_head *bh)3802{3803	return (buffer_uptodate(bh) &&3804			test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));3805}3806static inline void set_bitmap_uptodate(struct buffer_head *bh)3807{3808	set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);3809}3810 3811/* For ioend & aio unwritten conversion wait queues */3812#define EXT4_WQ_HASH_SZ		373813#define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\3814					    EXT4_WQ_HASH_SZ])3815extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];3816 3817extern int ext4_resize_begin(struct super_block *sb);3818extern int ext4_resize_end(struct super_block *sb, bool update_backups);3819 3820static inline void ext4_set_io_unwritten_flag(struct inode *inode,3821					      struct ext4_io_end *io_end)3822{3823	if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {3824		io_end->flag |= EXT4_IO_END_UNWRITTEN;3825		atomic_inc(&EXT4_I(inode)->i_unwritten);3826	}3827}3828 3829static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)3830{3831	struct inode *inode = io_end->inode;3832 3833	if (io_end->flag & EXT4_IO_END_UNWRITTEN) {3834		io_end->flag &= ~EXT4_IO_END_UNWRITTEN;3835		/* Wake up anyone waiting on unwritten extent conversion */3836		if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))3837			wake_up_all(ext4_ioend_wq(inode));3838	}3839}3840 3841extern const struct iomap_ops ext4_iomap_ops;3842extern const struct iomap_ops ext4_iomap_overwrite_ops;3843extern const struct iomap_ops ext4_iomap_report_ops;3844 3845static inline int ext4_buffer_uptodate(struct buffer_head *bh)3846{3847	/*3848	 * If the buffer has the write error flag, we have failed3849	 * to write out data in the block.  In this  case, we don't3850	 * have to read the block because we may read the old data3851	 * successfully.3852	 */3853	if (buffer_write_io_error(bh))3854		set_buffer_uptodate(bh);3855	return buffer_uptodate(bh);3856}3857 3858extern int ext4_block_write_begin(handle_t *handle, struct folio *folio,3859				  loff_t pos, unsigned len,3860				  get_block_t *get_block);3861#endif	/* __KERNEL__ */3862 3863#define EFSBADCRC	EBADMSG		/* Bad CRC detected */3864#define EFSCORRUPTED	EUCLEAN		/* Filesystem is corrupted */3865 3866#endif	/* _EXT4_H */3867