Loading...
1/*
2 * ext4.h
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/include/linux/minix_fs.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
16#ifndef _EXT4_H
17#define _EXT4_H
18
19#include <linux/types.h>
20#include <linux/blkdev.h>
21#include <linux/magic.h>
22#include <linux/jbd2.h>
23#include <linux/quota.h>
24#include <linux/rwsem.h>
25#include <linux/rbtree.h>
26#include <linux/seqlock.h>
27#include <linux/mutex.h>
28#include <linux/timer.h>
29#include <linux/wait.h>
30#include <linux/blockgroup_lock.h>
31#include <linux/percpu_counter.h>
32#include <crypto/hash.h>
33#ifdef __KERNEL__
34#include <linux/compat.h>
35#endif
36
37/*
38 * The fourth extended filesystem constants/structures
39 */
40
41/*
42 * Define EXT4FS_DEBUG to produce debug messages
43 */
44#undef EXT4FS_DEBUG
45
46/*
47 * Debug code
48 */
49#ifdef EXT4FS_DEBUG
50#define ext4_debug(f, a...) \
51 do { \
52 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
53 __FILE__, __LINE__, __func__); \
54 printk(KERN_DEBUG f, ## a); \
55 } while (0)
56#else
57#define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
58#endif
59
60#define EXT4_ERROR_INODE(inode, fmt, a...) \
61 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
62
63#define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
64 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
65
66#define EXT4_ERROR_FILE(file, block, fmt, a...) \
67 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
68
69/* data type for block offset of block group */
70typedef int ext4_grpblk_t;
71
72/* data type for filesystem-wide blocks number */
73typedef unsigned long long ext4_fsblk_t;
74
75/* data type for file logical block number */
76typedef __u32 ext4_lblk_t;
77
78/* data type for block group number */
79typedef unsigned int ext4_group_t;
80
81/*
82 * Flags used in mballoc's allocation_context flags field.
83 *
84 * Also used to show what's going on for debugging purposes when the
85 * flag field is exported via the traceport interface
86 */
87
88/* prefer goal again. length */
89#define EXT4_MB_HINT_MERGE 0x0001
90/* blocks already reserved */
91#define EXT4_MB_HINT_RESERVED 0x0002
92/* metadata is being allocated */
93#define EXT4_MB_HINT_METADATA 0x0004
94/* first blocks in the file */
95#define EXT4_MB_HINT_FIRST 0x0008
96/* search for the best chunk */
97#define EXT4_MB_HINT_BEST 0x0010
98/* data is being allocated */
99#define EXT4_MB_HINT_DATA 0x0020
100/* don't preallocate (for tails) */
101#define EXT4_MB_HINT_NOPREALLOC 0x0040
102/* allocate for locality group */
103#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
104/* allocate goal blocks or none */
105#define EXT4_MB_HINT_GOAL_ONLY 0x0100
106/* goal is meaningful */
107#define EXT4_MB_HINT_TRY_GOAL 0x0200
108/* blocks already pre-reserved by delayed allocation */
109#define EXT4_MB_DELALLOC_RESERVED 0x0400
110/* We are doing stream allocation */
111#define EXT4_MB_STREAM_ALLOC 0x0800
112/* Use reserved root blocks if needed */
113#define EXT4_MB_USE_ROOT_BLOCKS 0x1000
114
115struct ext4_allocation_request {
116 /* target inode for block we're allocating */
117 struct inode *inode;
118 /* how many blocks we want to allocate */
119 unsigned int len;
120 /* logical block in target inode */
121 ext4_lblk_t logical;
122 /* the closest logical allocated block to the left */
123 ext4_lblk_t lleft;
124 /* the closest logical allocated block to the right */
125 ext4_lblk_t lright;
126 /* phys. target (a hint) */
127 ext4_fsblk_t goal;
128 /* phys. block for the closest logical allocated block to the left */
129 ext4_fsblk_t pleft;
130 /* phys. block for the closest logical allocated block to the right */
131 ext4_fsblk_t pright;
132 /* flags. see above EXT4_MB_HINT_* */
133 unsigned int flags;
134};
135
136/*
137 * Logical to physical block mapping, used by ext4_map_blocks()
138 *
139 * This structure is used to pass requests into ext4_map_blocks() as
140 * well as to store the information returned by ext4_map_blocks(). It
141 * takes less room on the stack than a struct buffer_head.
142 */
143#define EXT4_MAP_NEW (1 << BH_New)
144#define EXT4_MAP_MAPPED (1 << BH_Mapped)
145#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
146#define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
147#define EXT4_MAP_UNINIT (1 << BH_Uninit)
148/* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
149 * ext4_map_blocks wants to know whether or not the underlying cluster has
150 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
151 * the requested mapping was from previously mapped (or delayed allocated)
152 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
153 * should never appear on buffer_head's state flags.
154 */
155#define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster)
156#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
157 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
158 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER)
159
160struct ext4_map_blocks {
161 ext4_fsblk_t m_pblk;
162 ext4_lblk_t m_lblk;
163 unsigned int m_len;
164 unsigned int m_flags;
165};
166
167/*
168 * For delayed allocation tracking
169 */
170struct mpage_da_data {
171 struct inode *inode;
172 sector_t b_blocknr; /* start block number of extent */
173 size_t b_size; /* size of extent */
174 unsigned long b_state; /* state of the extent */
175 unsigned long first_page, next_page; /* extent of pages */
176 struct writeback_control *wbc;
177 int io_done;
178 int pages_written;
179 int retval;
180};
181
182/*
183 * Flags for ext4_io_end->flags
184 */
185#define EXT4_IO_END_UNWRITTEN 0x0001
186#define EXT4_IO_END_ERROR 0x0002
187#define EXT4_IO_END_QUEUED 0x0004
188#define EXT4_IO_END_DIRECT 0x0008
189#define EXT4_IO_END_IN_FSYNC 0x0010
190
191struct ext4_io_page {
192 struct page *p_page;
193 atomic_t p_count;
194};
195
196#define MAX_IO_PAGES 128
197
198/*
199 * For converting uninitialized extents on a work queue.
200 *
201 * 'page' is only used from the writepage() path; 'pages' is only used for
202 * buffered writes; they are used to keep page references until conversion
203 * takes place. For AIO/DIO, neither field is filled in.
204 */
205typedef struct ext4_io_end {
206 struct list_head list; /* per-file finished IO list */
207 struct inode *inode; /* file being written to */
208 unsigned int flag; /* unwritten or not */
209 struct page *page; /* for writepage() path */
210 loff_t offset; /* offset in the file */
211 ssize_t size; /* size of the extent */
212 struct work_struct work; /* data work queue */
213 struct kiocb *iocb; /* iocb struct for AIO */
214 int result; /* error value for AIO */
215 int num_io_pages; /* for writepages() */
216 struct ext4_io_page *pages[MAX_IO_PAGES]; /* for writepages() */
217} ext4_io_end_t;
218
219struct ext4_io_submit {
220 int io_op;
221 struct bio *io_bio;
222 ext4_io_end_t *io_end;
223 struct ext4_io_page *io_page;
224 sector_t io_next_block;
225};
226
227/*
228 * Special inodes numbers
229 */
230#define EXT4_BAD_INO 1 /* Bad blocks inode */
231#define EXT4_ROOT_INO 2 /* Root inode */
232#define EXT4_USR_QUOTA_INO 3 /* User quota inode */
233#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
234#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
235#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
236#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
237#define EXT4_JOURNAL_INO 8 /* Journal inode */
238
239/* First non-reserved inode for old ext4 filesystems */
240#define EXT4_GOOD_OLD_FIRST_INO 11
241
242/*
243 * Maximal count of links to a file
244 */
245#define EXT4_LINK_MAX 65000
246
247/*
248 * Macro-instructions used to manage several block sizes
249 */
250#define EXT4_MIN_BLOCK_SIZE 1024
251#define EXT4_MAX_BLOCK_SIZE 65536
252#define EXT4_MIN_BLOCK_LOG_SIZE 10
253#define EXT4_MAX_BLOCK_LOG_SIZE 16
254#ifdef __KERNEL__
255# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
256#else
257# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
258#endif
259#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
260#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
261 EXT4_SB(s)->s_cluster_bits)
262#ifdef __KERNEL__
263# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
264# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
265#else
266# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
267#endif
268#ifdef __KERNEL__
269#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
270#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
271#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
272#else
273#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
274 EXT4_GOOD_OLD_INODE_SIZE : \
275 (s)->s_inode_size)
276#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
277 EXT4_GOOD_OLD_FIRST_INO : \
278 (s)->s_first_ino)
279#endif
280#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
281
282/* Translate a block number to a cluster number */
283#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
284/* Translate a cluster number to a block number */
285#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
286/* Translate # of blks to # of clusters */
287#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
288 (sbi)->s_cluster_bits)
289
290/*
291 * Structure of a blocks group descriptor
292 */
293struct ext4_group_desc
294{
295 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
296 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
297 __le32 bg_inode_table_lo; /* Inodes table block */
298 __le16 bg_free_blocks_count_lo;/* Free blocks count */
299 __le16 bg_free_inodes_count_lo;/* Free inodes count */
300 __le16 bg_used_dirs_count_lo; /* Directories count */
301 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
302 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
303 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
304 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
305 __le16 bg_itable_unused_lo; /* Unused inodes count */
306 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
307 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
308 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
309 __le32 bg_inode_table_hi; /* Inodes table block MSB */
310 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
311 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
312 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
313 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
314 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
315 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
316 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
317 __u32 bg_reserved;
318};
319
320#define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
321 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
322 sizeof(__le16))
323#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
324 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
325 sizeof(__le16))
326
327/*
328 * Structure of a flex block group info
329 */
330
331struct flex_groups {
332 atomic_t free_inodes;
333 atomic_t free_clusters;
334 atomic_t used_dirs;
335};
336
337#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
338#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
339#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
340
341/*
342 * Macro-instructions used to manage group descriptors
343 */
344#define EXT4_MIN_DESC_SIZE 32
345#define EXT4_MIN_DESC_SIZE_64BIT 64
346#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
347#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
348#ifdef __KERNEL__
349# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
350# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
351# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
352# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
353# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
354#else
355# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
356# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
357# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
358#endif
359
360/*
361 * Constants relative to the data blocks
362 */
363#define EXT4_NDIR_BLOCKS 12
364#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
365#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
366#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
367#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
368
369/*
370 * Inode flags
371 */
372#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
373#define EXT4_UNRM_FL 0x00000002 /* Undelete */
374#define EXT4_COMPR_FL 0x00000004 /* Compress file */
375#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
376#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
377#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
378#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
379#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
380/* Reserved for compression usage... */
381#define EXT4_DIRTY_FL 0x00000100
382#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
383#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
384#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
385/* End compression flags --- maybe not all used */
386#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
387#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
388#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
389#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
390#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
391#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
392#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
393#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
394#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
395#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
396#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
397
398#define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
399#define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
400
401/* Flags that should be inherited by new inodes from their parent. */
402#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
403 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
404 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
405 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
406
407/* Flags that are appropriate for regular files (all but dir-specific ones). */
408#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
409
410/* Flags that are appropriate for non-directories/regular files. */
411#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
412
413/* Mask out flags that are inappropriate for the given type of inode. */
414static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
415{
416 if (S_ISDIR(mode))
417 return flags;
418 else if (S_ISREG(mode))
419 return flags & EXT4_REG_FLMASK;
420 else
421 return flags & EXT4_OTHER_FLMASK;
422}
423
424/*
425 * Inode flags used for atomic set/get
426 */
427enum {
428 EXT4_INODE_SECRM = 0, /* Secure deletion */
429 EXT4_INODE_UNRM = 1, /* Undelete */
430 EXT4_INODE_COMPR = 2, /* Compress file */
431 EXT4_INODE_SYNC = 3, /* Synchronous updates */
432 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
433 EXT4_INODE_APPEND = 5, /* writes to file may only append */
434 EXT4_INODE_NODUMP = 6, /* do not dump file */
435 EXT4_INODE_NOATIME = 7, /* do not update atime */
436/* Reserved for compression usage... */
437 EXT4_INODE_DIRTY = 8,
438 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
439 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
440 EXT4_INODE_ECOMPR = 11, /* Compression error */
441/* End compression flags --- maybe not all used */
442 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
443 EXT4_INODE_IMAGIC = 13, /* AFS directory */
444 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
445 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
446 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
447 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
448 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
449 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
450 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
451 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
452 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
453};
454
455#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
456#define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
457 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
458 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
459
460/*
461 * Since it's pretty easy to mix up bit numbers and hex values, and we
462 * can't do a compile-time test for ENUM values, we use a run-time
463 * test to make sure that EXT4_XXX_FL is consistent with respect to
464 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop
465 * out so it won't cost any extra space in the compiled kernel image.
466 * But it's important that these values are the same, since we are
467 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
468 * must be consistent with the values of FS_XXX_FL defined in
469 * include/linux/fs.h and the on-disk values found in ext2, ext3, and
470 * ext4 filesystems, and of course the values defined in e2fsprogs.
471 *
472 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
473 */
474static inline void ext4_check_flag_values(void)
475{
476 CHECK_FLAG_VALUE(SECRM);
477 CHECK_FLAG_VALUE(UNRM);
478 CHECK_FLAG_VALUE(COMPR);
479 CHECK_FLAG_VALUE(SYNC);
480 CHECK_FLAG_VALUE(IMMUTABLE);
481 CHECK_FLAG_VALUE(APPEND);
482 CHECK_FLAG_VALUE(NODUMP);
483 CHECK_FLAG_VALUE(NOATIME);
484 CHECK_FLAG_VALUE(DIRTY);
485 CHECK_FLAG_VALUE(COMPRBLK);
486 CHECK_FLAG_VALUE(NOCOMPR);
487 CHECK_FLAG_VALUE(ECOMPR);
488 CHECK_FLAG_VALUE(INDEX);
489 CHECK_FLAG_VALUE(IMAGIC);
490 CHECK_FLAG_VALUE(JOURNAL_DATA);
491 CHECK_FLAG_VALUE(NOTAIL);
492 CHECK_FLAG_VALUE(DIRSYNC);
493 CHECK_FLAG_VALUE(TOPDIR);
494 CHECK_FLAG_VALUE(HUGE_FILE);
495 CHECK_FLAG_VALUE(EXTENTS);
496 CHECK_FLAG_VALUE(EA_INODE);
497 CHECK_FLAG_VALUE(EOFBLOCKS);
498 CHECK_FLAG_VALUE(RESERVED);
499}
500
501/* Used to pass group descriptor data when online resize is done */
502struct ext4_new_group_input {
503 __u32 group; /* Group number for this data */
504 __u64 block_bitmap; /* Absolute block number of block bitmap */
505 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
506 __u64 inode_table; /* Absolute block number of inode table start */
507 __u32 blocks_count; /* Total number of blocks in this group */
508 __u16 reserved_blocks; /* Number of reserved blocks in this group */
509 __u16 unused;
510};
511
512#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
513struct compat_ext4_new_group_input {
514 u32 group;
515 compat_u64 block_bitmap;
516 compat_u64 inode_bitmap;
517 compat_u64 inode_table;
518 u32 blocks_count;
519 u16 reserved_blocks;
520 u16 unused;
521};
522#endif
523
524/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
525struct ext4_new_group_data {
526 __u32 group;
527 __u64 block_bitmap;
528 __u64 inode_bitmap;
529 __u64 inode_table;
530 __u32 blocks_count;
531 __u16 reserved_blocks;
532 __u16 unused;
533 __u32 free_blocks_count;
534};
535
536/* Indexes used to index group tables in ext4_new_group_data */
537enum {
538 BLOCK_BITMAP = 0, /* block bitmap */
539 INODE_BITMAP, /* inode bitmap */
540 INODE_TABLE, /* inode tables */
541 GROUP_TABLE_COUNT,
542};
543
544/*
545 * Flags used by ext4_map_blocks()
546 */
547 /* Allocate any needed blocks and/or convert an unitialized
548 extent to be an initialized ext4 */
549#define EXT4_GET_BLOCKS_CREATE 0x0001
550 /* Request the creation of an unitialized extent */
551#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
552#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
553 EXT4_GET_BLOCKS_CREATE)
554 /* Caller is from the delayed allocation writeout path,
555 so set the magic i_delalloc_reserve_flag after taking the
556 inode allocation semaphore for */
557#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
558 /* caller is from the direct IO path, request to creation of an
559 unitialized extents if not allocated, split the uninitialized
560 extent if blocks has been preallocated already*/
561#define EXT4_GET_BLOCKS_PRE_IO 0x0008
562#define EXT4_GET_BLOCKS_CONVERT 0x0010
563#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
564 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
565 /* Convert extent to initialized after IO complete */
566#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
567 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
568 /* Punch out blocks of an extent */
569#define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020
570 /* Don't normalize allocation size (used for fallocate) */
571#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
572 /* Request will not result in inode size update (user for fallocate) */
573#define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
574
575/*
576 * Flags used by ext4_free_blocks
577 */
578#define EXT4_FREE_BLOCKS_METADATA 0x0001
579#define EXT4_FREE_BLOCKS_FORGET 0x0002
580#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
581#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
582#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
583#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
584
585/*
586 * Flags used by ext4_discard_partial_page_buffers
587 */
588#define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001
589
590/*
591 * ioctl commands
592 */
593#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
594#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
595#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
596#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
597#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
598#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
599#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
600#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
601#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
602#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
603#define EXT4_IOC_MIGRATE _IO('f', 9)
604 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
605 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
606#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
607#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
608#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
609
610#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
611/*
612 * ioctl commands in 32 bit emulation
613 */
614#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
615#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
616#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
617#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
618#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
619#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
620#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
621#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
622#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
623#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
624#endif
625
626/* Max physical block we can address w/o extents */
627#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
628
629/*
630 * Structure of an inode on the disk
631 */
632struct ext4_inode {
633 __le16 i_mode; /* File mode */
634 __le16 i_uid; /* Low 16 bits of Owner Uid */
635 __le32 i_size_lo; /* Size in bytes */
636 __le32 i_atime; /* Access time */
637 __le32 i_ctime; /* Inode Change time */
638 __le32 i_mtime; /* Modification time */
639 __le32 i_dtime; /* Deletion Time */
640 __le16 i_gid; /* Low 16 bits of Group Id */
641 __le16 i_links_count; /* Links count */
642 __le32 i_blocks_lo; /* Blocks count */
643 __le32 i_flags; /* File flags */
644 union {
645 struct {
646 __le32 l_i_version;
647 } linux1;
648 struct {
649 __u32 h_i_translator;
650 } hurd1;
651 struct {
652 __u32 m_i_reserved1;
653 } masix1;
654 } osd1; /* OS dependent 1 */
655 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
656 __le32 i_generation; /* File version (for NFS) */
657 __le32 i_file_acl_lo; /* File ACL */
658 __le32 i_size_high;
659 __le32 i_obso_faddr; /* Obsoleted fragment address */
660 union {
661 struct {
662 __le16 l_i_blocks_high; /* were l_i_reserved1 */
663 __le16 l_i_file_acl_high;
664 __le16 l_i_uid_high; /* these 2 fields */
665 __le16 l_i_gid_high; /* were reserved2[0] */
666 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
667 __le16 l_i_reserved;
668 } linux2;
669 struct {
670 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
671 __u16 h_i_mode_high;
672 __u16 h_i_uid_high;
673 __u16 h_i_gid_high;
674 __u32 h_i_author;
675 } hurd2;
676 struct {
677 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
678 __le16 m_i_file_acl_high;
679 __u32 m_i_reserved2[2];
680 } masix2;
681 } osd2; /* OS dependent 2 */
682 __le16 i_extra_isize;
683 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
684 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
685 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
686 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
687 __le32 i_crtime; /* File Creation time */
688 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
689 __le32 i_version_hi; /* high 32 bits for 64-bit version */
690};
691
692struct move_extent {
693 __u32 reserved; /* should be zero */
694 __u32 donor_fd; /* donor file descriptor */
695 __u64 orig_start; /* logical start offset in block for orig */
696 __u64 donor_start; /* logical start offset in block for donor */
697 __u64 len; /* block length to be moved */
698 __u64 moved_len; /* moved block length */
699};
700
701#define EXT4_EPOCH_BITS 2
702#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
703#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
704
705/*
706 * Extended fields will fit into an inode if the filesystem was formatted
707 * with large inodes (-I 256 or larger) and there are not currently any EAs
708 * consuming all of the available space. For new inodes we always reserve
709 * enough space for the kernel's known extended fields, but for inodes
710 * created with an old kernel this might not have been the case. None of
711 * the extended inode fields is critical for correct filesystem operation.
712 * This macro checks if a certain field fits in the inode. Note that
713 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
714 */
715#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
716 ((offsetof(typeof(*ext4_inode), field) + \
717 sizeof((ext4_inode)->field)) \
718 <= (EXT4_GOOD_OLD_INODE_SIZE + \
719 (einode)->i_extra_isize)) \
720
721static inline __le32 ext4_encode_extra_time(struct timespec *time)
722{
723 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
724 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
725 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
726}
727
728static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
729{
730 if (sizeof(time->tv_sec) > 4)
731 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
732 << 32;
733 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
734}
735
736#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
737do { \
738 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
739 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
740 (raw_inode)->xtime ## _extra = \
741 ext4_encode_extra_time(&(inode)->xtime); \
742} while (0)
743
744#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
745do { \
746 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
747 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
748 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
749 (raw_inode)->xtime ## _extra = \
750 ext4_encode_extra_time(&(einode)->xtime); \
751} while (0)
752
753#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
754do { \
755 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
756 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
757 ext4_decode_extra_time(&(inode)->xtime, \
758 raw_inode->xtime ## _extra); \
759 else \
760 (inode)->xtime.tv_nsec = 0; \
761} while (0)
762
763#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
764do { \
765 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
766 (einode)->xtime.tv_sec = \
767 (signed)le32_to_cpu((raw_inode)->xtime); \
768 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
769 ext4_decode_extra_time(&(einode)->xtime, \
770 raw_inode->xtime ## _extra); \
771 else \
772 (einode)->xtime.tv_nsec = 0; \
773} while (0)
774
775#define i_disk_version osd1.linux1.l_i_version
776
777#if defined(__KERNEL__) || defined(__linux__)
778#define i_reserved1 osd1.linux1.l_i_reserved1
779#define i_file_acl_high osd2.linux2.l_i_file_acl_high
780#define i_blocks_high osd2.linux2.l_i_blocks_high
781#define i_uid_low i_uid
782#define i_gid_low i_gid
783#define i_uid_high osd2.linux2.l_i_uid_high
784#define i_gid_high osd2.linux2.l_i_gid_high
785#define i_checksum_lo osd2.linux2.l_i_checksum_lo
786
787#elif defined(__GNU__)
788
789#define i_translator osd1.hurd1.h_i_translator
790#define i_uid_high osd2.hurd2.h_i_uid_high
791#define i_gid_high osd2.hurd2.h_i_gid_high
792#define i_author osd2.hurd2.h_i_author
793
794#elif defined(__masix__)
795
796#define i_reserved1 osd1.masix1.m_i_reserved1
797#define i_file_acl_high osd2.masix2.m_i_file_acl_high
798#define i_reserved2 osd2.masix2.m_i_reserved2
799
800#endif /* defined(__KERNEL__) || defined(__linux__) */
801
802/*
803 * storage for cached extent
804 * If ec_len == 0, then the cache is invalid.
805 * If ec_start == 0, then the cache represents a gap (null mapping)
806 */
807struct ext4_ext_cache {
808 ext4_fsblk_t ec_start;
809 ext4_lblk_t ec_block;
810 __u32 ec_len; /* must be 32bit to return holes */
811};
812
813/*
814 * fourth extended file system inode data in memory
815 */
816struct ext4_inode_info {
817 __le32 i_data[15]; /* unconverted */
818 __u32 i_dtime;
819 ext4_fsblk_t i_file_acl;
820
821 /*
822 * i_block_group is the number of the block group which contains
823 * this file's inode. Constant across the lifetime of the inode,
824 * it is ued for making block allocation decisions - we try to
825 * place a file's data blocks near its inode block, and new inodes
826 * near to their parent directory's inode.
827 */
828 ext4_group_t i_block_group;
829 ext4_lblk_t i_dir_start_lookup;
830#if (BITS_PER_LONG < 64)
831 unsigned long i_state_flags; /* Dynamic state flags */
832#endif
833 unsigned long i_flags;
834
835#ifdef CONFIG_EXT4_FS_XATTR
836 /*
837 * Extended attributes can be read independently of the main file
838 * data. Taking i_mutex even when reading would cause contention
839 * between readers of EAs and writers of regular file data, so
840 * instead we synchronize on xattr_sem when reading or changing
841 * EAs.
842 */
843 struct rw_semaphore xattr_sem;
844#endif
845
846 struct list_head i_orphan; /* unlinked but open inodes */
847
848 /*
849 * i_disksize keeps track of what the inode size is ON DISK, not
850 * in memory. During truncate, i_size is set to the new size by
851 * the VFS prior to calling ext4_truncate(), but the filesystem won't
852 * set i_disksize to 0 until the truncate is actually under way.
853 *
854 * The intent is that i_disksize always represents the blocks which
855 * are used by this file. This allows recovery to restart truncate
856 * on orphans if we crash during truncate. We actually write i_disksize
857 * into the on-disk inode when writing inodes out, instead of i_size.
858 *
859 * The only time when i_disksize and i_size may be different is when
860 * a truncate is in progress. The only things which change i_disksize
861 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
862 */
863 loff_t i_disksize;
864
865 /*
866 * i_data_sem is for serialising ext4_truncate() against
867 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
868 * data tree are chopped off during truncate. We can't do that in
869 * ext4 because whenever we perform intermediate commits during
870 * truncate, the inode and all the metadata blocks *must* be in a
871 * consistent state which allows truncation of the orphans to restart
872 * during recovery. Hence we must fix the get_block-vs-truncate race
873 * by other means, so we have i_data_sem.
874 */
875 struct rw_semaphore i_data_sem;
876 struct inode vfs_inode;
877 struct jbd2_inode *jinode;
878
879 struct ext4_ext_cache i_cached_extent;
880 /*
881 * File creation time. Its function is same as that of
882 * struct timespec i_{a,c,m}time in the generic inode.
883 */
884 struct timespec i_crtime;
885
886 /* mballoc */
887 struct list_head i_prealloc_list;
888 spinlock_t i_prealloc_lock;
889
890 /* ialloc */
891 ext4_group_t i_last_alloc_group;
892
893 /* allocation reservation info for delalloc */
894 /* In case of bigalloc, these refer to clusters rather than blocks */
895 unsigned int i_reserved_data_blocks;
896 unsigned int i_reserved_meta_blocks;
897 unsigned int i_allocated_meta_blocks;
898 ext4_lblk_t i_da_metadata_calc_last_lblock;
899 int i_da_metadata_calc_len;
900
901 /* on-disk additional length */
902 __u16 i_extra_isize;
903
904#ifdef CONFIG_QUOTA
905 /* quota space reservation, managed internally by quota code */
906 qsize_t i_reserved_quota;
907#endif
908
909 /* completed IOs that might need unwritten extents handling */
910 struct list_head i_completed_io_list;
911 spinlock_t i_completed_io_lock;
912 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
913 /* current io_end structure for async DIO write*/
914 ext4_io_end_t *cur_aio_dio;
915 atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */
916
917 spinlock_t i_block_reservation_lock;
918
919 /*
920 * Transactions that contain inode's metadata needed to complete
921 * fsync and fdatasync, respectively.
922 */
923 tid_t i_sync_tid;
924 tid_t i_datasync_tid;
925
926 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
927 __u32 i_csum_seed;
928};
929
930/*
931 * File system states
932 */
933#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
934#define EXT4_ERROR_FS 0x0002 /* Errors detected */
935#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
936
937/*
938 * Misc. filesystem flags
939 */
940#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
941#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
942#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
943
944/*
945 * Mount flags
946 */
947#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
948#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
949#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
950#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
951#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
952#define EXT4_MOUNT_ERRORS_MASK 0x00070
953#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
954#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
955#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
956#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
957#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
958#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
959#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
960#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
961#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
962#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
963#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
964#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
965#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
966#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
967#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
968#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
969#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
970#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
971#define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */
972#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
973#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
974#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
975#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
976#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
977
978#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
979 specified delalloc */
980
981#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
982 ~EXT4_MOUNT_##opt
983#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
984 EXT4_MOUNT_##opt
985#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
986 EXT4_MOUNT_##opt)
987
988#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
989 ~EXT4_MOUNT2_##opt
990#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
991 EXT4_MOUNT2_##opt
992#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
993 EXT4_MOUNT2_##opt)
994
995#define ext4_test_and_set_bit __test_and_set_bit_le
996#define ext4_set_bit __set_bit_le
997#define ext4_set_bit_atomic ext2_set_bit_atomic
998#define ext4_test_and_clear_bit __test_and_clear_bit_le
999#define ext4_clear_bit __clear_bit_le
1000#define ext4_clear_bit_atomic ext2_clear_bit_atomic
1001#define ext4_test_bit test_bit_le
1002#define ext4_find_next_zero_bit find_next_zero_bit_le
1003#define ext4_find_next_bit find_next_bit_le
1004
1005extern void ext4_set_bits(void *bm, int cur, int len);
1006
1007/*
1008 * Maximal mount counts between two filesystem checks
1009 */
1010#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1011#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1012
1013/*
1014 * Behaviour when detecting errors
1015 */
1016#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1017#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1018#define EXT4_ERRORS_PANIC 3 /* Panic */
1019#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1020
1021/* Metadata checksum algorithm codes */
1022#define EXT4_CRC32C_CHKSUM 1
1023
1024/*
1025 * Structure of the super block
1026 */
1027struct ext4_super_block {
1028/*00*/ __le32 s_inodes_count; /* Inodes count */
1029 __le32 s_blocks_count_lo; /* Blocks count */
1030 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1031 __le32 s_free_blocks_count_lo; /* Free blocks count */
1032/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1033 __le32 s_first_data_block; /* First Data Block */
1034 __le32 s_log_block_size; /* Block size */
1035 __le32 s_log_cluster_size; /* Allocation cluster size */
1036/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1037 __le32 s_clusters_per_group; /* # Clusters per group */
1038 __le32 s_inodes_per_group; /* # Inodes per group */
1039 __le32 s_mtime; /* Mount time */
1040/*30*/ __le32 s_wtime; /* Write time */
1041 __le16 s_mnt_count; /* Mount count */
1042 __le16 s_max_mnt_count; /* Maximal mount count */
1043 __le16 s_magic; /* Magic signature */
1044 __le16 s_state; /* File system state */
1045 __le16 s_errors; /* Behaviour when detecting errors */
1046 __le16 s_minor_rev_level; /* minor revision level */
1047/*40*/ __le32 s_lastcheck; /* time of last check */
1048 __le32 s_checkinterval; /* max. time between checks */
1049 __le32 s_creator_os; /* OS */
1050 __le32 s_rev_level; /* Revision level */
1051/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1052 __le16 s_def_resgid; /* Default gid for reserved blocks */
1053 /*
1054 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1055 *
1056 * Note: the difference between the compatible feature set and
1057 * the incompatible feature set is that if there is a bit set
1058 * in the incompatible feature set that the kernel doesn't
1059 * know about, it should refuse to mount the filesystem.
1060 *
1061 * e2fsck's requirements are more strict; if it doesn't know
1062 * about a feature in either the compatible or incompatible
1063 * feature set, it must abort and not try to meddle with
1064 * things it doesn't understand...
1065 */
1066 __le32 s_first_ino; /* First non-reserved inode */
1067 __le16 s_inode_size; /* size of inode structure */
1068 __le16 s_block_group_nr; /* block group # of this superblock */
1069 __le32 s_feature_compat; /* compatible feature set */
1070/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1071 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1072/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1073/*78*/ char s_volume_name[16]; /* volume name */
1074/*88*/ char s_last_mounted[64]; /* directory where last mounted */
1075/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1076 /*
1077 * Performance hints. Directory preallocation should only
1078 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1079 */
1080 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1081 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1082 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1083 /*
1084 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1085 */
1086/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1087/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1088 __le32 s_journal_dev; /* device number of journal file */
1089 __le32 s_last_orphan; /* start of list of inodes to delete */
1090 __le32 s_hash_seed[4]; /* HTREE hash seed */
1091 __u8 s_def_hash_version; /* Default hash version to use */
1092 __u8 s_jnl_backup_type;
1093 __le16 s_desc_size; /* size of group descriptor */
1094/*100*/ __le32 s_default_mount_opts;
1095 __le32 s_first_meta_bg; /* First metablock block group */
1096 __le32 s_mkfs_time; /* When the filesystem was created */
1097 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1098 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1099/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1100 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1101 __le32 s_free_blocks_count_hi; /* Free blocks count */
1102 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1103 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1104 __le32 s_flags; /* Miscellaneous flags */
1105 __le16 s_raid_stride; /* RAID stride */
1106 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1107 __le64 s_mmp_block; /* Block for multi-mount protection */
1108 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1109 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1110 __u8 s_checksum_type; /* metadata checksum algorithm used */
1111 __le16 s_reserved_pad;
1112 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1113 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1114 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1115 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1116 snapshot's future use */
1117 __le32 s_snapshot_list; /* inode number of the head of the
1118 on-disk snapshot list */
1119#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1120 __le32 s_error_count; /* number of fs errors */
1121 __le32 s_first_error_time; /* first time an error happened */
1122 __le32 s_first_error_ino; /* inode involved in first error */
1123 __le64 s_first_error_block; /* block involved of first error */
1124 __u8 s_first_error_func[32]; /* function where the error happened */
1125 __le32 s_first_error_line; /* line number where error happened */
1126 __le32 s_last_error_time; /* most recent time of an error */
1127 __le32 s_last_error_ino; /* inode involved in last error */
1128 __le32 s_last_error_line; /* line number where error happened */
1129 __le64 s_last_error_block; /* block involved of last error */
1130 __u8 s_last_error_func[32]; /* function where the error happened */
1131#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1132 __u8 s_mount_opts[64];
1133 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1134 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1135 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1136 __le32 s_reserved[108]; /* Padding to the end of the block */
1137 __le32 s_checksum; /* crc32c(superblock) */
1138};
1139
1140#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1141
1142#ifdef __KERNEL__
1143
1144/*
1145 * run-time mount flags
1146 */
1147#define EXT4_MF_MNTDIR_SAMPLED 0x0001
1148#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1149
1150/*
1151 * fourth extended-fs super-block data in memory
1152 */
1153struct ext4_sb_info {
1154 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1155 unsigned long s_inodes_per_block;/* Number of inodes per block */
1156 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1157 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1158 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1159 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1160 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1161 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1162 ext4_group_t s_groups_count; /* Number of groups in the fs */
1163 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1164 unsigned long s_overhead; /* # of fs overhead clusters */
1165 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1166 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1167 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1168 struct buffer_head * s_sbh; /* Buffer containing the super block */
1169 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1170 struct buffer_head **s_group_desc;
1171 unsigned int s_mount_opt;
1172 unsigned int s_mount_opt2;
1173 unsigned int s_mount_flags;
1174 unsigned int s_def_mount_opt;
1175 ext4_fsblk_t s_sb_block;
1176 kuid_t s_resuid;
1177 kgid_t s_resgid;
1178 unsigned short s_mount_state;
1179 unsigned short s_pad;
1180 int s_addr_per_block_bits;
1181 int s_desc_per_block_bits;
1182 int s_inode_size;
1183 int s_first_ino;
1184 unsigned int s_inode_readahead_blks;
1185 unsigned int s_inode_goal;
1186 spinlock_t s_next_gen_lock;
1187 u32 s_next_generation;
1188 u32 s_hash_seed[4];
1189 int s_def_hash_version;
1190 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1191 struct percpu_counter s_freeclusters_counter;
1192 struct percpu_counter s_freeinodes_counter;
1193 struct percpu_counter s_dirs_counter;
1194 struct percpu_counter s_dirtyclusters_counter;
1195 struct blockgroup_lock *s_blockgroup_lock;
1196 struct proc_dir_entry *s_proc;
1197 struct kobject s_kobj;
1198 struct completion s_kobj_unregister;
1199 struct super_block *s_sb;
1200
1201 /* Journaling */
1202 struct journal_s *s_journal;
1203 struct list_head s_orphan;
1204 struct mutex s_orphan_lock;
1205 unsigned long s_resize_flags; /* Flags indicating if there
1206 is a resizer */
1207 unsigned long s_commit_interval;
1208 u32 s_max_batch_time;
1209 u32 s_min_batch_time;
1210 struct block_device *journal_bdev;
1211#ifdef CONFIG_QUOTA
1212 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1213 int s_jquota_fmt; /* Format of quota to use */
1214#endif
1215 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1216 struct rb_root system_blks;
1217
1218#ifdef EXTENTS_STATS
1219 /* ext4 extents stats */
1220 unsigned long s_ext_min;
1221 unsigned long s_ext_max;
1222 unsigned long s_depth_max;
1223 spinlock_t s_ext_stats_lock;
1224 unsigned long s_ext_blocks;
1225 unsigned long s_ext_extents;
1226#endif
1227
1228 /* for buddy allocator */
1229 struct ext4_group_info ***s_group_info;
1230 struct inode *s_buddy_cache;
1231 spinlock_t s_md_lock;
1232 unsigned short *s_mb_offsets;
1233 unsigned int *s_mb_maxs;
1234
1235 /* tunables */
1236 unsigned long s_stripe;
1237 unsigned int s_mb_stream_request;
1238 unsigned int s_mb_max_to_scan;
1239 unsigned int s_mb_min_to_scan;
1240 unsigned int s_mb_stats;
1241 unsigned int s_mb_order2_reqs;
1242 unsigned int s_mb_group_prealloc;
1243 unsigned int s_max_writeback_mb_bump;
1244 /* where last allocation was done - for stream allocation */
1245 unsigned long s_mb_last_group;
1246 unsigned long s_mb_last_start;
1247
1248 /* stats for buddy allocator */
1249 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1250 atomic_t s_bal_success; /* we found long enough chunks */
1251 atomic_t s_bal_allocated; /* in blocks */
1252 atomic_t s_bal_ex_scanned; /* total extents scanned */
1253 atomic_t s_bal_goals; /* goal hits */
1254 atomic_t s_bal_breaks; /* too long searches */
1255 atomic_t s_bal_2orders; /* 2^order hits */
1256 spinlock_t s_bal_lock;
1257 unsigned long s_mb_buddies_generated;
1258 unsigned long long s_mb_generation_time;
1259 atomic_t s_mb_lost_chunks;
1260 atomic_t s_mb_preallocated;
1261 atomic_t s_mb_discarded;
1262 atomic_t s_lock_busy;
1263
1264 /* locality groups */
1265 struct ext4_locality_group __percpu *s_locality_groups;
1266
1267 /* for write statistics */
1268 unsigned long s_sectors_written_start;
1269 u64 s_kbytes_written;
1270
1271 unsigned int s_log_groups_per_flex;
1272 struct flex_groups *s_flex_groups;
1273
1274 /* workqueue for dio unwritten */
1275 struct workqueue_struct *dio_unwritten_wq;
1276
1277 /* timer for periodic error stats printing */
1278 struct timer_list s_err_report;
1279
1280 /* Lazy inode table initialization info */
1281 struct ext4_li_request *s_li_request;
1282 /* Wait multiplier for lazy initialization thread */
1283 unsigned int s_li_wait_mult;
1284
1285 /* Kernel thread for multiple mount protection */
1286 struct task_struct *s_mmp_tsk;
1287
1288 /* record the last minlen when FITRIM is called. */
1289 atomic_t s_last_trim_minblks;
1290
1291 /* Reference to checksum algorithm driver via cryptoapi */
1292 struct crypto_shash *s_chksum_driver;
1293
1294 /* Precomputed FS UUID checksum for seeding other checksums */
1295 __u32 s_csum_seed;
1296};
1297
1298static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1299{
1300 return sb->s_fs_info;
1301}
1302static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1303{
1304 return container_of(inode, struct ext4_inode_info, vfs_inode);
1305}
1306
1307static inline struct timespec ext4_current_time(struct inode *inode)
1308{
1309 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1310 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1311}
1312
1313static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1314{
1315 return ino == EXT4_ROOT_INO ||
1316 ino == EXT4_JOURNAL_INO ||
1317 ino == EXT4_RESIZE_INO ||
1318 (ino >= EXT4_FIRST_INO(sb) &&
1319 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1320}
1321
1322static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1323 struct ext4_io_end *io_end)
1324{
1325 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1326 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1327 atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten);
1328 }
1329}
1330
1331/*
1332 * Inode dynamic state flags
1333 */
1334enum {
1335 EXT4_STATE_JDATA, /* journaled data exists */
1336 EXT4_STATE_NEW, /* inode is newly created */
1337 EXT4_STATE_XATTR, /* has in-inode xattrs */
1338 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1339 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1340 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1341 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1342 EXT4_STATE_NEWENTRY, /* File just added to dir */
1343 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
1344};
1345
1346#define EXT4_INODE_BIT_FNS(name, field, offset) \
1347static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1348{ \
1349 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1350} \
1351static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1352{ \
1353 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1354} \
1355static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1356{ \
1357 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1358}
1359
1360EXT4_INODE_BIT_FNS(flag, flags, 0)
1361#if (BITS_PER_LONG < 64)
1362EXT4_INODE_BIT_FNS(state, state_flags, 0)
1363
1364static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1365{
1366 (ei)->i_state_flags = 0;
1367}
1368#else
1369EXT4_INODE_BIT_FNS(state, flags, 32)
1370
1371static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1372{
1373 /* We depend on the fact that callers will set i_flags */
1374}
1375#endif
1376#else
1377/* Assume that user mode programs are passing in an ext4fs superblock, not
1378 * a kernel struct super_block. This will allow us to call the feature-test
1379 * macros from user land. */
1380#define EXT4_SB(sb) (sb)
1381#endif
1382
1383#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1384
1385/*
1386 * Codes for operating systems
1387 */
1388#define EXT4_OS_LINUX 0
1389#define EXT4_OS_HURD 1
1390#define EXT4_OS_MASIX 2
1391#define EXT4_OS_FREEBSD 3
1392#define EXT4_OS_LITES 4
1393
1394/*
1395 * Revision levels
1396 */
1397#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1398#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1399
1400#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1401#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1402
1403#define EXT4_GOOD_OLD_INODE_SIZE 128
1404
1405/*
1406 * Feature set definitions
1407 */
1408
1409#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1410 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1411#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1412 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1413#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1414 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1415#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1416 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1417#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1418 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1419#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1420 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1421#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1422 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1423#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1424 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1425#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1426 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1427
1428#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1429#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1430#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1431#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1432#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1433#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1434
1435#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1436#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1437#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1438#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1439#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1440#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1441#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1442#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1443#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1444/*
1445 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1446 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1447 * all other data structures' checksums. However, the METADATA_CSUM and
1448 * GDT_CSUM bits are mutually exclusive.
1449 */
1450#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1451
1452#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1453#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1454#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1455#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1456#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1457#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1458#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1459#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1460#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1461#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1462#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1463#define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
1464#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1465#define EXT4_FEATURE_INCOMPAT_INLINEDATA 0x8000 /* data in inode */
1466
1467#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1468#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1469 EXT4_FEATURE_INCOMPAT_META_BG)
1470#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1471 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1472 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1473
1474#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1475#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1476 EXT4_FEATURE_INCOMPAT_RECOVER| \
1477 EXT4_FEATURE_INCOMPAT_META_BG)
1478#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1479 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1480 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1481
1482#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1483#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1484 EXT4_FEATURE_INCOMPAT_RECOVER| \
1485 EXT4_FEATURE_INCOMPAT_META_BG| \
1486 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1487 EXT4_FEATURE_INCOMPAT_64BIT| \
1488 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1489 EXT4_FEATURE_INCOMPAT_MMP)
1490#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1491 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1492 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1493 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1494 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1495 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1496 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1497 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1498 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)
1499
1500/*
1501 * Default values for user and/or group using reserved blocks
1502 */
1503#define EXT4_DEF_RESUID 0
1504#define EXT4_DEF_RESGID 0
1505
1506#define EXT4_DEF_INODE_READAHEAD_BLKS 32
1507
1508/*
1509 * Default mount options
1510 */
1511#define EXT4_DEFM_DEBUG 0x0001
1512#define EXT4_DEFM_BSDGROUPS 0x0002
1513#define EXT4_DEFM_XATTR_USER 0x0004
1514#define EXT4_DEFM_ACL 0x0008
1515#define EXT4_DEFM_UID16 0x0010
1516#define EXT4_DEFM_JMODE 0x0060
1517#define EXT4_DEFM_JMODE_DATA 0x0020
1518#define EXT4_DEFM_JMODE_ORDERED 0x0040
1519#define EXT4_DEFM_JMODE_WBACK 0x0060
1520#define EXT4_DEFM_NOBARRIER 0x0100
1521#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1522#define EXT4_DEFM_DISCARD 0x0400
1523#define EXT4_DEFM_NODELALLOC 0x0800
1524
1525/*
1526 * Default journal batch times
1527 */
1528#define EXT4_DEF_MIN_BATCH_TIME 0
1529#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1530
1531/*
1532 * Minimum number of groups in a flexgroup before we separate out
1533 * directories into the first block group of a flexgroup
1534 */
1535#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1536
1537/*
1538 * Structure of a directory entry
1539 */
1540#define EXT4_NAME_LEN 255
1541
1542struct ext4_dir_entry {
1543 __le32 inode; /* Inode number */
1544 __le16 rec_len; /* Directory entry length */
1545 __le16 name_len; /* Name length */
1546 char name[EXT4_NAME_LEN]; /* File name */
1547};
1548
1549/*
1550 * The new version of the directory entry. Since EXT4 structures are
1551 * stored in intel byte order, and the name_len field could never be
1552 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1553 * file_type field.
1554 */
1555struct ext4_dir_entry_2 {
1556 __le32 inode; /* Inode number */
1557 __le16 rec_len; /* Directory entry length */
1558 __u8 name_len; /* Name length */
1559 __u8 file_type;
1560 char name[EXT4_NAME_LEN]; /* File name */
1561};
1562
1563/*
1564 * This is a bogus directory entry at the end of each leaf block that
1565 * records checksums.
1566 */
1567struct ext4_dir_entry_tail {
1568 __le32 det_reserved_zero1; /* Pretend to be unused */
1569 __le16 det_rec_len; /* 12 */
1570 __u8 det_reserved_zero2; /* Zero name length */
1571 __u8 det_reserved_ft; /* 0xDE, fake file type */
1572 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1573};
1574
1575/*
1576 * Ext4 directory file types. Only the low 3 bits are used. The
1577 * other bits are reserved for now.
1578 */
1579#define EXT4_FT_UNKNOWN 0
1580#define EXT4_FT_REG_FILE 1
1581#define EXT4_FT_DIR 2
1582#define EXT4_FT_CHRDEV 3
1583#define EXT4_FT_BLKDEV 4
1584#define EXT4_FT_FIFO 5
1585#define EXT4_FT_SOCK 6
1586#define EXT4_FT_SYMLINK 7
1587
1588#define EXT4_FT_MAX 8
1589
1590#define EXT4_FT_DIR_CSUM 0xDE
1591
1592/*
1593 * EXT4_DIR_PAD defines the directory entries boundaries
1594 *
1595 * NOTE: It must be a multiple of 4
1596 */
1597#define EXT4_DIR_PAD 4
1598#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1599#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1600 ~EXT4_DIR_ROUND)
1601#define EXT4_MAX_REC_LEN ((1<<16)-1)
1602
1603/*
1604 * If we ever get support for fs block sizes > page_size, we'll need
1605 * to remove the #if statements in the next two functions...
1606 */
1607static inline unsigned int
1608ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1609{
1610 unsigned len = le16_to_cpu(dlen);
1611
1612#if (PAGE_CACHE_SIZE >= 65536)
1613 if (len == EXT4_MAX_REC_LEN || len == 0)
1614 return blocksize;
1615 return (len & 65532) | ((len & 3) << 16);
1616#else
1617 return len;
1618#endif
1619}
1620
1621static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1622{
1623 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1624 BUG();
1625#if (PAGE_CACHE_SIZE >= 65536)
1626 if (len < 65536)
1627 return cpu_to_le16(len);
1628 if (len == blocksize) {
1629 if (blocksize == 65536)
1630 return cpu_to_le16(EXT4_MAX_REC_LEN);
1631 else
1632 return cpu_to_le16(0);
1633 }
1634 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1635#else
1636 return cpu_to_le16(len);
1637#endif
1638}
1639
1640/*
1641 * Hash Tree Directory indexing
1642 * (c) Daniel Phillips, 2001
1643 */
1644
1645#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1646 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1647 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1648#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1649#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1650
1651/* Legal values for the dx_root hash_version field: */
1652
1653#define DX_HASH_LEGACY 0
1654#define DX_HASH_HALF_MD4 1
1655#define DX_HASH_TEA 2
1656#define DX_HASH_LEGACY_UNSIGNED 3
1657#define DX_HASH_HALF_MD4_UNSIGNED 4
1658#define DX_HASH_TEA_UNSIGNED 5
1659
1660static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1661 const void *address, unsigned int length)
1662{
1663 struct {
1664 struct shash_desc shash;
1665 char ctx[crypto_shash_descsize(sbi->s_chksum_driver)];
1666 } desc;
1667 int err;
1668
1669 desc.shash.tfm = sbi->s_chksum_driver;
1670 desc.shash.flags = 0;
1671 *(u32 *)desc.ctx = crc;
1672
1673 err = crypto_shash_update(&desc.shash, address, length);
1674 BUG_ON(err);
1675
1676 return *(u32 *)desc.ctx;
1677}
1678
1679#ifdef __KERNEL__
1680
1681/* hash info structure used by the directory hash */
1682struct dx_hash_info
1683{
1684 u32 hash;
1685 u32 minor_hash;
1686 int hash_version;
1687 u32 *seed;
1688};
1689
1690
1691/* 32 and 64 bit signed EOF for dx directories */
1692#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1693#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1694
1695
1696/*
1697 * Control parameters used by ext4_htree_next_block
1698 */
1699#define HASH_NB_ALWAYS 1
1700
1701
1702/*
1703 * Describe an inode's exact location on disk and in memory
1704 */
1705struct ext4_iloc
1706{
1707 struct buffer_head *bh;
1708 unsigned long offset;
1709 ext4_group_t block_group;
1710};
1711
1712static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1713{
1714 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1715}
1716
1717/*
1718 * This structure is stuffed into the struct file's private_data field
1719 * for directories. It is where we put information so that we can do
1720 * readdir operations in hash tree order.
1721 */
1722struct dir_private_info {
1723 struct rb_root root;
1724 struct rb_node *curr_node;
1725 struct fname *extra_fname;
1726 loff_t last_pos;
1727 __u32 curr_hash;
1728 __u32 curr_minor_hash;
1729 __u32 next_hash;
1730};
1731
1732/* calculate the first block number of the group */
1733static inline ext4_fsblk_t
1734ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1735{
1736 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1737 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1738}
1739
1740/*
1741 * Special error return code only used by dx_probe() and its callers.
1742 */
1743#define ERR_BAD_DX_DIR -75000
1744
1745void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1746 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1747
1748/*
1749 * Timeout and state flag for lazy initialization inode thread.
1750 */
1751#define EXT4_DEF_LI_WAIT_MULT 10
1752#define EXT4_DEF_LI_MAX_START_DELAY 5
1753#define EXT4_LAZYINIT_QUIT 0x0001
1754#define EXT4_LAZYINIT_RUNNING 0x0002
1755
1756/*
1757 * Lazy inode table initialization info
1758 */
1759struct ext4_lazy_init {
1760 unsigned long li_state;
1761 struct list_head li_request_list;
1762 struct mutex li_list_mtx;
1763};
1764
1765struct ext4_li_request {
1766 struct super_block *lr_super;
1767 struct ext4_sb_info *lr_sbi;
1768 ext4_group_t lr_next_group;
1769 struct list_head lr_request;
1770 unsigned long lr_next_sched;
1771 unsigned long lr_timeout;
1772};
1773
1774struct ext4_features {
1775 struct kobject f_kobj;
1776 struct completion f_kobj_unregister;
1777};
1778
1779/*
1780 * This structure will be used for multiple mount protection. It will be
1781 * written into the block number saved in the s_mmp_block field in the
1782 * superblock. Programs that check MMP should assume that if
1783 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1784 * to use the filesystem, regardless of how old the timestamp is.
1785 */
1786#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1787#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1788#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1789#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1790
1791struct mmp_struct {
1792 __le32 mmp_magic; /* Magic number for MMP */
1793 __le32 mmp_seq; /* Sequence no. updated periodically */
1794
1795 /*
1796 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1797 * purposes and do not affect the correctness of the algorithm
1798 */
1799 __le64 mmp_time; /* Time last updated */
1800 char mmp_nodename[64]; /* Node which last updated MMP block */
1801 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1802
1803 /*
1804 * mmp_check_interval is used to verify if the MMP block has been
1805 * updated on the block device. The value is updated based on the
1806 * maximum time to write the MMP block during an update cycle.
1807 */
1808 __le16 mmp_check_interval;
1809
1810 __le16 mmp_pad1;
1811 __le32 mmp_pad2[226];
1812 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
1813};
1814
1815/* arguments passed to the mmp thread */
1816struct mmpd_data {
1817 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1818 struct super_block *sb; /* super block of the fs */
1819};
1820
1821/*
1822 * Check interval multiplier
1823 * The MMP block is written every update interval and initially checked every
1824 * update interval x the multiplier (the value is then adapted based on the
1825 * write latency). The reason is that writes can be delayed under load and we
1826 * don't want readers to incorrectly assume that the filesystem is no longer
1827 * in use.
1828 */
1829#define EXT4_MMP_CHECK_MULT 2UL
1830
1831/*
1832 * Minimum interval for MMP checking in seconds.
1833 */
1834#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1835
1836/*
1837 * Maximum interval for MMP checking in seconds.
1838 */
1839#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1840
1841/*
1842 * Function prototypes
1843 */
1844
1845/*
1846 * Ok, these declarations are also in <linux/kernel.h> but none of the
1847 * ext4 source programs needs to include it so they are duplicated here.
1848 */
1849# define NORET_TYPE /**/
1850# define ATTRIB_NORET __attribute__((noreturn))
1851# define NORET_AND noreturn,
1852
1853/* bitmap.c */
1854extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
1855void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1856 struct ext4_group_desc *gdp,
1857 struct buffer_head *bh, int sz);
1858int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1859 struct ext4_group_desc *gdp,
1860 struct buffer_head *bh, int sz);
1861void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1862 struct ext4_group_desc *gdp,
1863 struct buffer_head *bh, int sz);
1864int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1865 struct ext4_group_desc *gdp,
1866 struct buffer_head *bh, int sz);
1867
1868/* balloc.c */
1869extern void ext4_validate_block_bitmap(struct super_block *sb,
1870 struct ext4_group_desc *desc,
1871 unsigned int block_group,
1872 struct buffer_head *bh);
1873extern unsigned int ext4_block_group(struct super_block *sb,
1874 ext4_fsblk_t blocknr);
1875extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1876 ext4_fsblk_t blocknr);
1877extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1878extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1879 ext4_group_t group);
1880extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1881 ext4_fsblk_t goal,
1882 unsigned int flags,
1883 unsigned long *count,
1884 int *errp);
1885extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1886 s64 nclusters, unsigned int flags);
1887extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
1888extern void ext4_check_blocks_bitmap(struct super_block *);
1889extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1890 ext4_group_t block_group,
1891 struct buffer_head ** bh);
1892extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1893
1894extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
1895 ext4_group_t block_group);
1896extern int ext4_wait_block_bitmap(struct super_block *sb,
1897 ext4_group_t block_group,
1898 struct buffer_head *bh);
1899extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1900 ext4_group_t block_group);
1901extern void ext4_init_block_bitmap(struct super_block *sb,
1902 struct buffer_head *bh,
1903 ext4_group_t group,
1904 struct ext4_group_desc *desc);
1905extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
1906 ext4_group_t block_group,
1907 struct ext4_group_desc *gdp);
1908extern unsigned ext4_num_overhead_clusters(struct super_block *sb,
1909 ext4_group_t block_group,
1910 struct ext4_group_desc *gdp);
1911ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
1912
1913/* dir.c */
1914extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1915 struct file *,
1916 struct ext4_dir_entry_2 *,
1917 struct buffer_head *, unsigned int);
1918#define ext4_check_dir_entry(dir, filp, de, bh, offset) \
1919 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1920 (de), (bh), (offset)))
1921extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1922 __u32 minor_hash,
1923 struct ext4_dir_entry_2 *dirent);
1924extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1925
1926/* fsync.c */
1927extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
1928extern int ext4_flush_completed_IO(struct inode *);
1929
1930/* hash.c */
1931extern int ext4fs_dirhash(const char *name, int len, struct
1932 dx_hash_info *hinfo);
1933
1934/* ialloc.c */
1935extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t,
1936 const struct qstr *qstr, __u32 goal,
1937 uid_t *owner);
1938extern void ext4_free_inode(handle_t *, struct inode *);
1939extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1940extern unsigned long ext4_count_free_inodes(struct super_block *);
1941extern unsigned long ext4_count_dirs(struct super_block *);
1942extern void ext4_check_inodes_bitmap(struct super_block *);
1943extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1944extern int ext4_init_inode_table(struct super_block *sb,
1945 ext4_group_t group, int barrier);
1946extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
1947
1948/* mballoc.c */
1949extern long ext4_mb_stats;
1950extern long ext4_mb_max_to_scan;
1951extern int ext4_mb_init(struct super_block *);
1952extern int ext4_mb_release(struct super_block *);
1953extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1954 struct ext4_allocation_request *, int *);
1955extern int ext4_mb_reserve_blocks(struct super_block *, int);
1956extern void ext4_discard_preallocations(struct inode *);
1957extern int __init ext4_init_mballoc(void);
1958extern void ext4_exit_mballoc(void);
1959extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1960 struct buffer_head *bh, ext4_fsblk_t block,
1961 unsigned long count, int flags);
1962extern int ext4_mb_add_groupinfo(struct super_block *sb,
1963 ext4_group_t i, struct ext4_group_desc *desc);
1964extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
1965 ext4_fsblk_t block, unsigned long count);
1966extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
1967
1968/* inode.c */
1969struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1970 ext4_lblk_t, int, int *);
1971struct buffer_head *ext4_bread(handle_t *, struct inode *,
1972 ext4_lblk_t, int, int *);
1973int ext4_get_block(struct inode *inode, sector_t iblock,
1974 struct buffer_head *bh_result, int create);
1975
1976extern struct inode *ext4_iget(struct super_block *, unsigned long);
1977extern int ext4_write_inode(struct inode *, struct writeback_control *);
1978extern int ext4_setattr(struct dentry *, struct iattr *);
1979extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1980 struct kstat *stat);
1981extern void ext4_evict_inode(struct inode *);
1982extern void ext4_clear_inode(struct inode *);
1983extern int ext4_sync_inode(handle_t *, struct inode *);
1984extern void ext4_dirty_inode(struct inode *, int);
1985extern int ext4_change_inode_journal_flag(struct inode *, int);
1986extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1987extern int ext4_can_truncate(struct inode *inode);
1988extern void ext4_truncate(struct inode *);
1989extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
1990extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1991extern void ext4_set_inode_flags(struct inode *);
1992extern void ext4_get_inode_flags(struct ext4_inode_info *);
1993extern int ext4_alloc_da_blocks(struct inode *inode);
1994extern void ext4_set_aops(struct inode *inode);
1995extern int ext4_writepage_trans_blocks(struct inode *);
1996extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1997extern int ext4_discard_partial_page_buffers(handle_t *handle,
1998 struct address_space *mapping, loff_t from,
1999 loff_t length, int flags);
2000extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2001extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2002extern void ext4_da_update_reserve_space(struct inode *inode,
2003 int used, int quota_claim);
2004
2005/* indirect.c */
2006extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2007 struct ext4_map_blocks *map, int flags);
2008extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
2009 const struct iovec *iov, loff_t offset,
2010 unsigned long nr_segs);
2011extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2012extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
2013extern void ext4_ind_truncate(struct inode *inode);
2014
2015/* ioctl.c */
2016extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2017extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2018
2019/* migrate.c */
2020extern int ext4_ext_migrate(struct inode *);
2021
2022/* namei.c */
2023extern int ext4_dirent_csum_verify(struct inode *inode,
2024 struct ext4_dir_entry *dirent);
2025extern int ext4_orphan_add(handle_t *, struct inode *);
2026extern int ext4_orphan_del(handle_t *, struct inode *);
2027extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2028 __u32 start_minor_hash, __u32 *next_hash);
2029
2030/* resize.c */
2031extern int ext4_group_add(struct super_block *sb,
2032 struct ext4_new_group_data *input);
2033extern int ext4_group_extend(struct super_block *sb,
2034 struct ext4_super_block *es,
2035 ext4_fsblk_t n_blocks_count);
2036extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2037
2038/* super.c */
2039extern int ext4_calculate_overhead(struct super_block *sb);
2040extern int ext4_superblock_csum_verify(struct super_block *sb,
2041 struct ext4_super_block *es);
2042extern void ext4_superblock_csum_set(struct super_block *sb,
2043 struct ext4_super_block *es);
2044extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2045extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2046extern void ext4_kvfree(void *ptr);
2047extern __printf(4, 5)
2048void __ext4_error(struct super_block *, const char *, unsigned int,
2049 const char *, ...);
2050#define ext4_error(sb, message...) __ext4_error(sb, __func__, \
2051 __LINE__, ## message)
2052extern __printf(5, 6)
2053void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2054 const char *, ...);
2055extern __printf(5, 6)
2056void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2057 const char *, ...);
2058extern void __ext4_std_error(struct super_block *, const char *,
2059 unsigned int, int);
2060extern __printf(4, 5)
2061void __ext4_abort(struct super_block *, const char *, unsigned int,
2062 const char *, ...);
2063#define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
2064 __LINE__, ## message)
2065extern __printf(4, 5)
2066void __ext4_warning(struct super_block *, const char *, unsigned int,
2067 const char *, ...);
2068#define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
2069 __LINE__, ## message)
2070extern __printf(3, 4)
2071void ext4_msg(struct super_block *, const char *, const char *, ...);
2072extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2073 const char *, unsigned int, const char *);
2074#define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \
2075 __LINE__, msg)
2076extern __printf(7, 8)
2077void __ext4_grp_locked_error(const char *, unsigned int,
2078 struct super_block *, ext4_group_t,
2079 unsigned long, ext4_fsblk_t,
2080 const char *, ...);
2081#define ext4_grp_locked_error(sb, grp, message...) \
2082 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
2083extern void ext4_update_dynamic_rev(struct super_block *sb);
2084extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2085 __u32 compat);
2086extern int ext4_update_rocompat_feature(handle_t *handle,
2087 struct super_block *sb, __u32 rocompat);
2088extern int ext4_update_incompat_feature(handle_t *handle,
2089 struct super_block *sb, __u32 incompat);
2090extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2091 struct ext4_group_desc *bg);
2092extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2093 struct ext4_group_desc *bg);
2094extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2095 struct ext4_group_desc *bg);
2096extern __u32 ext4_free_group_clusters(struct super_block *sb,
2097 struct ext4_group_desc *bg);
2098extern __u32 ext4_free_inodes_count(struct super_block *sb,
2099 struct ext4_group_desc *bg);
2100extern __u32 ext4_used_dirs_count(struct super_block *sb,
2101 struct ext4_group_desc *bg);
2102extern __u32 ext4_itable_unused_count(struct super_block *sb,
2103 struct ext4_group_desc *bg);
2104extern void ext4_block_bitmap_set(struct super_block *sb,
2105 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2106extern void ext4_inode_bitmap_set(struct super_block *sb,
2107 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2108extern void ext4_inode_table_set(struct super_block *sb,
2109 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2110extern void ext4_free_group_clusters_set(struct super_block *sb,
2111 struct ext4_group_desc *bg,
2112 __u32 count);
2113extern void ext4_free_inodes_set(struct super_block *sb,
2114 struct ext4_group_desc *bg, __u32 count);
2115extern void ext4_used_dirs_set(struct super_block *sb,
2116 struct ext4_group_desc *bg, __u32 count);
2117extern void ext4_itable_unused_set(struct super_block *sb,
2118 struct ext4_group_desc *bg, __u32 count);
2119extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2120 struct ext4_group_desc *gdp);
2121extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2122 struct ext4_group_desc *gdp);
2123
2124static inline int ext4_has_group_desc_csum(struct super_block *sb)
2125{
2126 return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2127 EXT4_FEATURE_RO_COMPAT_GDT_CSUM |
2128 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
2129}
2130
2131static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2132{
2133 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2134 le32_to_cpu(es->s_blocks_count_lo);
2135}
2136
2137static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2138{
2139 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2140 le32_to_cpu(es->s_r_blocks_count_lo);
2141}
2142
2143static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2144{
2145 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2146 le32_to_cpu(es->s_free_blocks_count_lo);
2147}
2148
2149static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2150 ext4_fsblk_t blk)
2151{
2152 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2153 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2154}
2155
2156static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2157 ext4_fsblk_t blk)
2158{
2159 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2160 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2161}
2162
2163static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2164 ext4_fsblk_t blk)
2165{
2166 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2167 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2168}
2169
2170static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2171{
2172 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2173 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2174 le32_to_cpu(raw_inode->i_size_lo);
2175 else
2176 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2177}
2178
2179static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2180{
2181 raw_inode->i_size_lo = cpu_to_le32(i_size);
2182 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2183}
2184
2185static inline
2186struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2187 ext4_group_t group)
2188{
2189 struct ext4_group_info ***grp_info;
2190 long indexv, indexh;
2191 grp_info = EXT4_SB(sb)->s_group_info;
2192 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2193 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2194 return grp_info[indexv][indexh];
2195}
2196
2197/*
2198 * Reading s_groups_count requires using smp_rmb() afterwards. See
2199 * the locking protocol documented in the comments of ext4_group_add()
2200 * in resize.c
2201 */
2202static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2203{
2204 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2205
2206 smp_rmb();
2207 return ngroups;
2208}
2209
2210static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2211 ext4_group_t block_group)
2212{
2213 return block_group >> sbi->s_log_groups_per_flex;
2214}
2215
2216static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2217{
2218 return 1 << sbi->s_log_groups_per_flex;
2219}
2220
2221#define ext4_std_error(sb, errno) \
2222do { \
2223 if ((errno)) \
2224 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2225} while (0)
2226
2227#ifdef CONFIG_SMP
2228/* Each CPU can accumulate percpu_counter_batch clusters in their local
2229 * counters. So we need to make sure we have free clusters more
2230 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2231 */
2232#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2233#else
2234#define EXT4_FREECLUSTERS_WATERMARK 0
2235#endif
2236
2237static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2238{
2239 /*
2240 * XXX: replace with spinlock if seen contended -bzzz
2241 */
2242 down_write(&EXT4_I(inode)->i_data_sem);
2243 if (newsize > EXT4_I(inode)->i_disksize)
2244 EXT4_I(inode)->i_disksize = newsize;
2245 up_write(&EXT4_I(inode)->i_data_sem);
2246 return ;
2247}
2248
2249struct ext4_group_info {
2250 unsigned long bb_state;
2251 struct rb_root bb_free_root;
2252 ext4_grpblk_t bb_first_free; /* first free block */
2253 ext4_grpblk_t bb_free; /* total free blocks */
2254 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2255 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2256 struct list_head bb_prealloc_list;
2257#ifdef DOUBLE_CHECK
2258 void *bb_bitmap;
2259#endif
2260 struct rw_semaphore alloc_sem;
2261 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2262 * regions, index is order.
2263 * bb_counters[3] = 5 means
2264 * 5 free 8-block regions. */
2265};
2266
2267#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2268#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2269
2270#define EXT4_MB_GRP_NEED_INIT(grp) \
2271 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2272
2273#define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2274 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2275#define EXT4_MB_GRP_SET_TRIMMED(grp) \
2276 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2277#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2278 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2279
2280#define EXT4_MAX_CONTENTION 8
2281#define EXT4_CONTENTION_THRESHOLD 2
2282
2283static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2284 ext4_group_t group)
2285{
2286 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2287}
2288
2289/*
2290 * Returns true if the filesystem is busy enough that attempts to
2291 * access the block group locks has run into contention.
2292 */
2293static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2294{
2295 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2296}
2297
2298static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2299{
2300 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2301 if (spin_trylock(lock))
2302 /*
2303 * We're able to grab the lock right away, so drop the
2304 * lock contention counter.
2305 */
2306 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2307 else {
2308 /*
2309 * The lock is busy, so bump the contention counter,
2310 * and then wait on the spin lock.
2311 */
2312 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2313 EXT4_MAX_CONTENTION);
2314 spin_lock(lock);
2315 }
2316}
2317
2318static inline void ext4_unlock_group(struct super_block *sb,
2319 ext4_group_t group)
2320{
2321 spin_unlock(ext4_group_lock_ptr(sb, group));
2322}
2323
2324static inline void ext4_mark_super_dirty(struct super_block *sb)
2325{
2326 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
2327
2328 ext4_superblock_csum_set(sb, es);
2329 if (EXT4_SB(sb)->s_journal == NULL)
2330 sb->s_dirt =1;
2331}
2332
2333/*
2334 * Block validity checking
2335 */
2336#define ext4_check_indirect_blockref(inode, bh) \
2337 ext4_check_blockref(__func__, __LINE__, inode, \
2338 (__le32 *)(bh)->b_data, \
2339 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2340
2341#define ext4_ind_check_inode(inode) \
2342 ext4_check_blockref(__func__, __LINE__, inode, \
2343 EXT4_I(inode)->i_data, \
2344 EXT4_NDIR_BLOCKS)
2345
2346/*
2347 * Inodes and files operations
2348 */
2349
2350/* dir.c */
2351extern const struct file_operations ext4_dir_operations;
2352
2353/* file.c */
2354extern const struct inode_operations ext4_file_inode_operations;
2355extern const struct file_operations ext4_file_operations;
2356extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2357
2358/* namei.c */
2359extern const struct inode_operations ext4_dir_inode_operations;
2360extern const struct inode_operations ext4_special_inode_operations;
2361extern struct dentry *ext4_get_parent(struct dentry *child);
2362
2363/* symlink.c */
2364extern const struct inode_operations ext4_symlink_inode_operations;
2365extern const struct inode_operations ext4_fast_symlink_inode_operations;
2366
2367/* block_validity */
2368extern void ext4_release_system_zone(struct super_block *sb);
2369extern int ext4_setup_system_zone(struct super_block *sb);
2370extern int __init ext4_init_system_zone(void);
2371extern void ext4_exit_system_zone(void);
2372extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2373 ext4_fsblk_t start_blk,
2374 unsigned int count);
2375extern int ext4_check_blockref(const char *, unsigned int,
2376 struct inode *, __le32 *, unsigned int);
2377
2378/* extents.c */
2379extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2380extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2381extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2382 int chunk);
2383extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2384 struct ext4_map_blocks *map, int flags);
2385extern void ext4_ext_truncate(struct inode *);
2386extern int ext4_ext_punch_hole(struct file *file, loff_t offset,
2387 loff_t length);
2388extern void ext4_ext_init(struct super_block *);
2389extern void ext4_ext_release(struct super_block *);
2390extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2391 loff_t len);
2392extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
2393 ssize_t len);
2394extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2395 struct ext4_map_blocks *map, int flags);
2396extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2397 __u64 start, __u64 len);
2398/* move_extent.c */
2399extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2400 __u64 start_orig, __u64 start_donor,
2401 __u64 len, __u64 *moved_len);
2402
2403/* page-io.c */
2404extern int __init ext4_init_pageio(void);
2405extern void ext4_exit_pageio(void);
2406extern void ext4_ioend_wait(struct inode *);
2407extern void ext4_free_io_end(ext4_io_end_t *io);
2408extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2409extern int ext4_end_io_nolock(ext4_io_end_t *io);
2410extern void ext4_io_submit(struct ext4_io_submit *io);
2411extern int ext4_bio_write_page(struct ext4_io_submit *io,
2412 struct page *page,
2413 int len,
2414 struct writeback_control *wbc);
2415
2416/* mmp.c */
2417extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2418extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp);
2419extern int ext4_mmp_csum_verify(struct super_block *sb,
2420 struct mmp_struct *mmp);
2421
2422/* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2423enum ext4_state_bits {
2424 BH_Uninit /* blocks are allocated but uninitialized on disk */
2425 = BH_JBDPrivateStart,
2426 BH_AllocFromCluster, /* allocated blocks were part of already
2427 * allocated cluster. Note that this flag will
2428 * never, ever appear in a buffer_head's state
2429 * flag. See EXT4_MAP_FROM_CLUSTER to see where
2430 * this is used. */
2431 BH_Da_Mapped, /* Delayed allocated block that now has a mapping. This
2432 * flag is set when ext4_map_blocks is called on a
2433 * delayed allocated block to get its real mapping. */
2434};
2435
2436BUFFER_FNS(Uninit, uninit)
2437TAS_BUFFER_FNS(Uninit, uninit)
2438BUFFER_FNS(Da_Mapped, da_mapped)
2439
2440/*
2441 * Add new method to test wether block and inode bitmaps are properly
2442 * initialized. With uninit_bg reading the block from disk is not enough
2443 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2444 */
2445#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2446
2447static inline int bitmap_uptodate(struct buffer_head *bh)
2448{
2449 return (buffer_uptodate(bh) &&
2450 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2451}
2452static inline void set_bitmap_uptodate(struct buffer_head *bh)
2453{
2454 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2455}
2456
2457#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2458
2459/* For ioend & aio unwritten conversion wait queues */
2460#define EXT4_WQ_HASH_SZ 37
2461#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2462 EXT4_WQ_HASH_SZ])
2463#define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2464 EXT4_WQ_HASH_SZ])
2465extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2466extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2467
2468#define EXT4_RESIZING 0
2469extern int ext4_resize_begin(struct super_block *sb);
2470extern void ext4_resize_end(struct super_block *sb);
2471
2472#endif /* __KERNEL__ */
2473
2474#include "ext4_extents.h"
2475
2476#endif /* _EXT4_H */
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ext4.h
4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * from
11 *
12 * linux/include/linux/minix_fs.h
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 */
16
17#ifndef _EXT4_H
18#define _EXT4_H
19
20#include <linux/types.h>
21#include <linux/blkdev.h>
22#include <linux/magic.h>
23#include <linux/jbd2.h>
24#include <linux/quota.h>
25#include <linux/rwsem.h>
26#include <linux/rbtree.h>
27#include <linux/seqlock.h>
28#include <linux/mutex.h>
29#include <linux/timer.h>
30#include <linux/version.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#endif
43
44#include <linux/fscrypt.h>
45#include <linux/fsverity.h>
46
47#include <linux/compiler.h>
48
49/*
50 * The fourth extended filesystem constants/structures
51 */
52
53/*
54 * with AGGRESSIVE_CHECK allocator runs consistency checks over
55 * structures. these checks slow things down a lot
56 */
57#define AGGRESSIVE_CHECK__
58
59/*
60 * with DOUBLE_CHECK defined mballoc creates persistent in-core
61 * bitmaps, maintains and uses them to check for double allocations
62 */
63#define DOUBLE_CHECK__
64
65/*
66 * Define EXT4FS_DEBUG to produce debug messages
67 */
68#undef EXT4FS_DEBUG
69
70/*
71 * Debug code
72 */
73#ifdef EXT4FS_DEBUG
74#define ext4_debug(f, a...) \
75 do { \
76 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
77 __FILE__, __LINE__, __func__); \
78 printk(KERN_DEBUG f, ## a); \
79 } while (0)
80#else
81#define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
82#endif
83
84 /*
85 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
86 */
87#define EXT_DEBUG__
88
89/*
90 * Dynamic printk for controlled extents debugging.
91 */
92#ifdef CONFIG_EXT4_DEBUG
93#define ext_debug(ino, fmt, ...) \
94 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \
95 current->comm, task_pid_nr(current), \
96 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \
97 __func__, ##__VA_ARGS__)
98#else
99#define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
100#endif
101
102/* data type for block offset of block group */
103typedef int ext4_grpblk_t;
104
105/* data type for filesystem-wide blocks number */
106typedef unsigned long long ext4_fsblk_t;
107
108/* data type for file logical block number */
109typedef __u32 ext4_lblk_t;
110
111/* data type for block group number */
112typedef unsigned int ext4_group_t;
113
114enum SHIFT_DIRECTION {
115 SHIFT_LEFT = 0,
116 SHIFT_RIGHT,
117};
118
119/*
120 * Flags used in mballoc's allocation_context flags field.
121 *
122 * Also used to show what's going on for debugging purposes when the
123 * flag field is exported via the traceport interface
124 */
125
126/* prefer goal again. length */
127#define EXT4_MB_HINT_MERGE 0x0001
128/* blocks already reserved */
129#define EXT4_MB_HINT_RESERVED 0x0002
130/* metadata is being allocated */
131#define EXT4_MB_HINT_METADATA 0x0004
132/* first blocks in the file */
133#define EXT4_MB_HINT_FIRST 0x0008
134/* search for the best chunk */
135#define EXT4_MB_HINT_BEST 0x0010
136/* data is being allocated */
137#define EXT4_MB_HINT_DATA 0x0020
138/* don't preallocate (for tails) */
139#define EXT4_MB_HINT_NOPREALLOC 0x0040
140/* allocate for locality group */
141#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
142/* allocate goal blocks or none */
143#define EXT4_MB_HINT_GOAL_ONLY 0x0100
144/* goal is meaningful */
145#define EXT4_MB_HINT_TRY_GOAL 0x0200
146/* blocks already pre-reserved by delayed allocation */
147#define EXT4_MB_DELALLOC_RESERVED 0x0400
148/* We are doing stream allocation */
149#define EXT4_MB_STREAM_ALLOC 0x0800
150/* Use reserved root blocks if needed */
151#define EXT4_MB_USE_ROOT_BLOCKS 0x1000
152/* Use blocks from reserved pool */
153#define EXT4_MB_USE_RESERVED 0x2000
154/* Do strict check for free blocks while retrying block allocation */
155#define EXT4_MB_STRICT_CHECK 0x4000
156
157struct ext4_allocation_request {
158 /* target inode for block we're allocating */
159 struct inode *inode;
160 /* how many blocks we want to allocate */
161 unsigned int len;
162 /* logical block in target inode */
163 ext4_lblk_t logical;
164 /* the closest logical allocated block to the left */
165 ext4_lblk_t lleft;
166 /* the closest logical allocated block to the right */
167 ext4_lblk_t lright;
168 /* phys. target (a hint) */
169 ext4_fsblk_t goal;
170 /* phys. block for the closest logical allocated block to the left */
171 ext4_fsblk_t pleft;
172 /* phys. block for the closest logical allocated block to the right */
173 ext4_fsblk_t pright;
174 /* flags. see above EXT4_MB_HINT_* */
175 unsigned int flags;
176};
177
178/*
179 * Logical to physical block mapping, used by ext4_map_blocks()
180 *
181 * This structure is used to pass requests into ext4_map_blocks() as
182 * well as to store the information returned by ext4_map_blocks(). It
183 * takes less room on the stack than a struct buffer_head.
184 */
185#define EXT4_MAP_NEW BIT(BH_New)
186#define EXT4_MAP_MAPPED BIT(BH_Mapped)
187#define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten)
188#define EXT4_MAP_BOUNDARY BIT(BH_Boundary)
189#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
190 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
191
192struct ext4_map_blocks {
193 ext4_fsblk_t m_pblk;
194 ext4_lblk_t m_lblk;
195 unsigned int m_len;
196 unsigned int m_flags;
197};
198
199/*
200 * Block validity checking, system zone rbtree.
201 */
202struct ext4_system_blocks {
203 struct rb_root root;
204 struct rcu_head rcu;
205};
206
207/*
208 * Flags for ext4_io_end->flags
209 */
210#define EXT4_IO_END_UNWRITTEN 0x0001
211
212struct ext4_io_end_vec {
213 struct list_head list; /* list of io_end_vec */
214 loff_t offset; /* offset in the file */
215 ssize_t size; /* size of the extent */
216};
217
218/*
219 * For converting unwritten extents on a work queue. 'handle' is used for
220 * buffered writeback.
221 */
222typedef struct ext4_io_end {
223 struct list_head list; /* per-file finished IO list */
224 handle_t *handle; /* handle reserved for extent
225 * conversion */
226 struct inode *inode; /* file being written to */
227 struct bio *bio; /* Linked list of completed
228 * bios covering the extent */
229 unsigned int flag; /* unwritten or not */
230 atomic_t count; /* reference counter */
231 struct list_head list_vec; /* list of ext4_io_end_vec */
232} ext4_io_end_t;
233
234struct ext4_io_submit {
235 struct writeback_control *io_wbc;
236 struct bio *io_bio;
237 ext4_io_end_t *io_end;
238 sector_t io_next_block;
239};
240
241/*
242 * Special inodes numbers
243 */
244#define EXT4_BAD_INO 1 /* Bad blocks inode */
245#define EXT4_ROOT_INO 2 /* Root inode */
246#define EXT4_USR_QUOTA_INO 3 /* User quota inode */
247#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
248#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
249#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
250#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
251#define EXT4_JOURNAL_INO 8 /* Journal inode */
252
253/* First non-reserved inode for old ext4 filesystems */
254#define EXT4_GOOD_OLD_FIRST_INO 11
255
256/*
257 * Maximal count of links to a file
258 */
259#define EXT4_LINK_MAX 65000
260
261/*
262 * Macro-instructions used to manage several block sizes
263 */
264#define EXT4_MIN_BLOCK_SIZE 1024
265#define EXT4_MAX_BLOCK_SIZE 65536
266#define EXT4_MIN_BLOCK_LOG_SIZE 10
267#define EXT4_MAX_BLOCK_LOG_SIZE 16
268#define EXT4_MAX_CLUSTER_LOG_SIZE 30
269#ifdef __KERNEL__
270# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
271#else
272# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
273#endif
274#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
275#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
276 EXT4_SB(s)->s_cluster_bits)
277#ifdef __KERNEL__
278# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
279# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
280#else
281# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
282#endif
283#ifdef __KERNEL__
284#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
285#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
286#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
287#else
288#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
289 EXT4_GOOD_OLD_INODE_SIZE : \
290 (s)->s_inode_size)
291#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
292 EXT4_GOOD_OLD_FIRST_INO : \
293 (s)->s_first_ino)
294#endif
295#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
296#define EXT4_MAX_BLOCKS(size, offset, blkbits) \
297 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
298 blkbits))
299
300/* Translate a block number to a cluster number */
301#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
302/* Translate a cluster number to a block number */
303#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
304/* Translate # of blks to # of clusters */
305#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
306 (sbi)->s_cluster_bits)
307/* Mask out the low bits to get the starting block of the cluster */
308#define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
309 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
310#define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
311 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
312/* Fill in the low bits to get the last block of the cluster */
313#define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \
314 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
315/* Get the cluster offset */
316#define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
317 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
318#define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
319 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
320
321/*
322 * Structure of a blocks group descriptor
323 */
324struct ext4_group_desc
325{
326 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
327 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
328 __le32 bg_inode_table_lo; /* Inodes table block */
329 __le16 bg_free_blocks_count_lo;/* Free blocks count */
330 __le16 bg_free_inodes_count_lo;/* Free inodes count */
331 __le16 bg_used_dirs_count_lo; /* Directories count */
332 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
333 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
334 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
335 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
336 __le16 bg_itable_unused_lo; /* Unused inodes count */
337 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
338 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
339 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
340 __le32 bg_inode_table_hi; /* Inodes table block MSB */
341 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
342 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
343 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
344 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
345 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
346 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
347 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
348 __u32 bg_reserved;
349};
350
351#define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
352 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
353 sizeof(__le16))
354#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
355 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
356 sizeof(__le16))
357
358/*
359 * Structure of a flex block group info
360 */
361
362struct flex_groups {
363 atomic64_t free_clusters;
364 atomic_t free_inodes;
365 atomic_t used_dirs;
366};
367
368#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
369#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
370#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
371
372/*
373 * Macro-instructions used to manage group descriptors
374 */
375#define EXT4_MIN_DESC_SIZE 32
376#define EXT4_MIN_DESC_SIZE_64BIT 64
377#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
378#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
379#ifdef __KERNEL__
380# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
381# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
382# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
383# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
384# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
385#else
386# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
387# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
388# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
389#endif
390
391/*
392 * Constants relative to the data blocks
393 */
394#define EXT4_NDIR_BLOCKS 12
395#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
396#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
397#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
398#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
399
400/*
401 * Inode flags
402 */
403#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
404#define EXT4_UNRM_FL 0x00000002 /* Undelete */
405#define EXT4_COMPR_FL 0x00000004 /* Compress file */
406#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
407#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
408#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
409#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
410#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
411/* Reserved for compression usage... */
412#define EXT4_DIRTY_FL 0x00000100
413#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
414#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
415 /* nb: was previously EXT2_ECOMPR_FL */
416#define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
417/* End compression flags --- maybe not all used */
418#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
419#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
420#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
421#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
422#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
423#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
424#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
425#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
426#define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */
427#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
428/* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
429
430#define EXT4_DAX_FL 0x02000000 /* Inode is DAX */
431
432#define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
433#define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
434#define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */
435#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
436
437/* User modifiable flags */
438#define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \
439 EXT4_UNRM_FL | \
440 EXT4_COMPR_FL | \
441 EXT4_SYNC_FL | \
442 EXT4_IMMUTABLE_FL | \
443 EXT4_APPEND_FL | \
444 EXT4_NODUMP_FL | \
445 EXT4_NOATIME_FL | \
446 EXT4_JOURNAL_DATA_FL | \
447 EXT4_NOTAIL_FL | \
448 EXT4_DIRSYNC_FL | \
449 EXT4_TOPDIR_FL | \
450 EXT4_EXTENTS_FL | \
451 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
452 EXT4_DAX_FL | \
453 EXT4_PROJINHERIT_FL | \
454 EXT4_CASEFOLD_FL)
455
456/* User visible flags */
457#define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \
458 EXT4_DIRTY_FL | \
459 EXT4_COMPRBLK_FL | \
460 EXT4_NOCOMPR_FL | \
461 EXT4_ENCRYPT_FL | \
462 EXT4_INDEX_FL | \
463 EXT4_VERITY_FL | \
464 EXT4_INLINE_DATA_FL)
465
466/* Flags we can manipulate with through FS_IOC_FSSETXATTR */
467#define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \
468 EXT4_IMMUTABLE_FL | \
469 EXT4_APPEND_FL | \
470 EXT4_NODUMP_FL | \
471 EXT4_NOATIME_FL | \
472 EXT4_PROJINHERIT_FL | \
473 EXT4_DAX_FL)
474
475/* Flags that should be inherited by new inodes from their parent. */
476#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
477 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
478 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
479 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
480 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
481 EXT4_DAX_FL)
482
483/* Flags that are appropriate for regular files (all but dir-specific ones). */
484#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
485 EXT4_PROJINHERIT_FL))
486
487/* Flags that are appropriate for non-directories/regular files. */
488#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
489
490/* The only flags that should be swapped */
491#define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
492
493/* Flags which are mutually exclusive to DAX */
494#define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
495 EXT4_JOURNAL_DATA_FL)
496
497/* Mask out flags that are inappropriate for the given type of inode. */
498static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
499{
500 if (S_ISDIR(mode))
501 return flags;
502 else if (S_ISREG(mode))
503 return flags & EXT4_REG_FLMASK;
504 else
505 return flags & EXT4_OTHER_FLMASK;
506}
507
508/*
509 * Inode flags used for atomic set/get
510 */
511enum {
512 EXT4_INODE_SECRM = 0, /* Secure deletion */
513 EXT4_INODE_UNRM = 1, /* Undelete */
514 EXT4_INODE_COMPR = 2, /* Compress file */
515 EXT4_INODE_SYNC = 3, /* Synchronous updates */
516 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
517 EXT4_INODE_APPEND = 5, /* writes to file may only append */
518 EXT4_INODE_NODUMP = 6, /* do not dump file */
519 EXT4_INODE_NOATIME = 7, /* do not update atime */
520/* Reserved for compression usage... */
521 EXT4_INODE_DIRTY = 8,
522 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
523 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
524 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */
525/* End compression flags --- maybe not all used */
526 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
527 EXT4_INODE_IMAGIC = 13, /* AFS directory */
528 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
529 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
530 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
531 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
532 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
533 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
534 EXT4_INODE_VERITY = 20, /* Verity protected inode */
535 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
536/* 22 was formerly EXT4_INODE_EOFBLOCKS */
537 EXT4_INODE_DAX = 25, /* Inode is DAX */
538 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
539 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */
540 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */
541 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
542};
543
544/*
545 * Since it's pretty easy to mix up bit numbers and hex values, we use a
546 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
547 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
548 * any extra space in the compiled kernel image, otherwise, the build will fail.
549 * It's important that these values are the same, since we are using
550 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
551 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
552 * values found in ext2, ext3 and ext4 filesystems, and of course the values
553 * defined in e2fsprogs.
554 *
555 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
556 */
557#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
558#define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
559
560static inline void ext4_check_flag_values(void)
561{
562 CHECK_FLAG_VALUE(SECRM);
563 CHECK_FLAG_VALUE(UNRM);
564 CHECK_FLAG_VALUE(COMPR);
565 CHECK_FLAG_VALUE(SYNC);
566 CHECK_FLAG_VALUE(IMMUTABLE);
567 CHECK_FLAG_VALUE(APPEND);
568 CHECK_FLAG_VALUE(NODUMP);
569 CHECK_FLAG_VALUE(NOATIME);
570 CHECK_FLAG_VALUE(DIRTY);
571 CHECK_FLAG_VALUE(COMPRBLK);
572 CHECK_FLAG_VALUE(NOCOMPR);
573 CHECK_FLAG_VALUE(ENCRYPT);
574 CHECK_FLAG_VALUE(INDEX);
575 CHECK_FLAG_VALUE(IMAGIC);
576 CHECK_FLAG_VALUE(JOURNAL_DATA);
577 CHECK_FLAG_VALUE(NOTAIL);
578 CHECK_FLAG_VALUE(DIRSYNC);
579 CHECK_FLAG_VALUE(TOPDIR);
580 CHECK_FLAG_VALUE(HUGE_FILE);
581 CHECK_FLAG_VALUE(EXTENTS);
582 CHECK_FLAG_VALUE(VERITY);
583 CHECK_FLAG_VALUE(EA_INODE);
584 CHECK_FLAG_VALUE(INLINE_DATA);
585 CHECK_FLAG_VALUE(PROJINHERIT);
586 CHECK_FLAG_VALUE(CASEFOLD);
587 CHECK_FLAG_VALUE(RESERVED);
588}
589
590/* Used to pass group descriptor data when online resize is done */
591struct ext4_new_group_input {
592 __u32 group; /* Group number for this data */
593 __u64 block_bitmap; /* Absolute block number of block bitmap */
594 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
595 __u64 inode_table; /* Absolute block number of inode table start */
596 __u32 blocks_count; /* Total number of blocks in this group */
597 __u16 reserved_blocks; /* Number of reserved blocks in this group */
598 __u16 unused;
599};
600
601#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
602struct compat_ext4_new_group_input {
603 u32 group;
604 compat_u64 block_bitmap;
605 compat_u64 inode_bitmap;
606 compat_u64 inode_table;
607 u32 blocks_count;
608 u16 reserved_blocks;
609 u16 unused;
610};
611#endif
612
613/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
614struct ext4_new_group_data {
615 __u32 group;
616 __u64 block_bitmap;
617 __u64 inode_bitmap;
618 __u64 inode_table;
619 __u32 blocks_count;
620 __u16 reserved_blocks;
621 __u16 mdata_blocks;
622 __u32 free_clusters_count;
623};
624
625/* Indexes used to index group tables in ext4_new_group_data */
626enum {
627 BLOCK_BITMAP = 0, /* block bitmap */
628 INODE_BITMAP, /* inode bitmap */
629 INODE_TABLE, /* inode tables */
630 GROUP_TABLE_COUNT,
631};
632
633/*
634 * Flags used by ext4_map_blocks()
635 */
636 /* Allocate any needed blocks and/or convert an unwritten
637 extent to be an initialized ext4 */
638#define EXT4_GET_BLOCKS_CREATE 0x0001
639 /* Request the creation of an unwritten extent */
640#define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
641#define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
642 EXT4_GET_BLOCKS_CREATE)
643 /* Caller is from the delayed allocation writeout path
644 * finally doing the actual allocation of delayed blocks */
645#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
646 /* caller is from the direct IO path, request to creation of an
647 unwritten extents if not allocated, split the unwritten
648 extent if blocks has been preallocated already*/
649#define EXT4_GET_BLOCKS_PRE_IO 0x0008
650#define EXT4_GET_BLOCKS_CONVERT 0x0010
651#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
652 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
653 /* Convert extent to initialized after IO complete */
654#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
655 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
656 /* Eventual metadata allocation (due to growing extent tree)
657 * should not fail, so try to use reserved blocks for that.*/
658#define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
659 /* Don't normalize allocation size (used for fallocate) */
660#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
661 /* Convert written extents to unwritten */
662#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
663 /* Write zeros to newly created written extents */
664#define EXT4_GET_BLOCKS_ZERO 0x0200
665#define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
666 EXT4_GET_BLOCKS_ZERO)
667 /* Caller will submit data before dropping transaction handle. This
668 * allows jbd2 to avoid submitting data before commit. */
669#define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400
670
671/*
672 * The bit position of these flags must not overlap with any of the
673 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
674 * read_extent_tree_block(), ext4_split_extent_at(),
675 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
676 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
677 * caching the extents when reading from the extent tree while a
678 * truncate or punch hole operation is in progress.
679 */
680#define EXT4_EX_NOCACHE 0x40000000
681#define EXT4_EX_FORCE_CACHE 0x20000000
682#define EXT4_EX_NOFAIL 0x10000000
683
684/*
685 * Flags used by ext4_free_blocks
686 */
687#define EXT4_FREE_BLOCKS_METADATA 0x0001
688#define EXT4_FREE_BLOCKS_FORGET 0x0002
689#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
690#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
691#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
692#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
693#define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040
694
695/*
696 * ioctl commands
697 */
698#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
699#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
700#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
701#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
702#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
703#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
704#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
705#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
706#define EXT4_IOC_MIGRATE _IO('f', 9)
707 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
708 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
709#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
710#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
711#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
712#define EXT4_IOC_SWAP_BOOT _IO('f', 17)
713#define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
714/* ioctl codes 19--39 are reserved for fscrypt */
715#define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40)
716#define EXT4_IOC_GETSTATE _IOW('f', 41, __u32)
717#define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap)
718
719#define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
720
721/*
722 * Flags for going down operation
723 */
724#define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */
725#define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */
726#define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */
727
728/*
729 * Flags returned by EXT4_IOC_GETSTATE
730 *
731 * We only expose to userspace a subset of the state flags in
732 * i_state_flags
733 */
734#define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001
735#define EXT4_STATE_FLAG_NEW 0x00000002
736#define EXT4_STATE_FLAG_NEWENTRY 0x00000004
737#define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008
738
739#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
740/*
741 * ioctl commands in 32 bit emulation
742 */
743#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
744#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
745#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
746#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
747#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
748#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
749#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
750#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
751#endif
752
753/*
754 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
755 * It indicates that the entry in extent status cache is for a hole.
756 */
757#define EXT4_FIEMAP_EXTENT_HOLE 0x08000000
758
759/* Max physical block we can address w/o extents */
760#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
761
762/* Max logical block we can support */
763#define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE
764
765/*
766 * Structure of an inode on the disk
767 */
768struct ext4_inode {
769 __le16 i_mode; /* File mode */
770 __le16 i_uid; /* Low 16 bits of Owner Uid */
771 __le32 i_size_lo; /* Size in bytes */
772 __le32 i_atime; /* Access time */
773 __le32 i_ctime; /* Inode Change time */
774 __le32 i_mtime; /* Modification time */
775 __le32 i_dtime; /* Deletion Time */
776 __le16 i_gid; /* Low 16 bits of Group Id */
777 __le16 i_links_count; /* Links count */
778 __le32 i_blocks_lo; /* Blocks count */
779 __le32 i_flags; /* File flags */
780 union {
781 struct {
782 __le32 l_i_version;
783 } linux1;
784 struct {
785 __u32 h_i_translator;
786 } hurd1;
787 struct {
788 __u32 m_i_reserved1;
789 } masix1;
790 } osd1; /* OS dependent 1 */
791 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
792 __le32 i_generation; /* File version (for NFS) */
793 __le32 i_file_acl_lo; /* File ACL */
794 __le32 i_size_high;
795 __le32 i_obso_faddr; /* Obsoleted fragment address */
796 union {
797 struct {
798 __le16 l_i_blocks_high; /* were l_i_reserved1 */
799 __le16 l_i_file_acl_high;
800 __le16 l_i_uid_high; /* these 2 fields */
801 __le16 l_i_gid_high; /* were reserved2[0] */
802 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
803 __le16 l_i_reserved;
804 } linux2;
805 struct {
806 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
807 __u16 h_i_mode_high;
808 __u16 h_i_uid_high;
809 __u16 h_i_gid_high;
810 __u32 h_i_author;
811 } hurd2;
812 struct {
813 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
814 __le16 m_i_file_acl_high;
815 __u32 m_i_reserved2[2];
816 } masix2;
817 } osd2; /* OS dependent 2 */
818 __le16 i_extra_isize;
819 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
820 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
821 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
822 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
823 __le32 i_crtime; /* File Creation time */
824 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
825 __le32 i_version_hi; /* high 32 bits for 64-bit version */
826 __le32 i_projid; /* Project ID */
827};
828
829struct move_extent {
830 __u32 reserved; /* should be zero */
831 __u32 donor_fd; /* donor file descriptor */
832 __u64 orig_start; /* logical start offset in block for orig */
833 __u64 donor_start; /* logical start offset in block for donor */
834 __u64 len; /* block length to be moved */
835 __u64 moved_len; /* moved block length */
836};
837
838#define EXT4_EPOCH_BITS 2
839#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
840#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
841
842/*
843 * Extended fields will fit into an inode if the filesystem was formatted
844 * with large inodes (-I 256 or larger) and there are not currently any EAs
845 * consuming all of the available space. For new inodes we always reserve
846 * enough space for the kernel's known extended fields, but for inodes
847 * created with an old kernel this might not have been the case. None of
848 * the extended inode fields is critical for correct filesystem operation.
849 * This macro checks if a certain field fits in the inode. Note that
850 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
851 */
852#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
853 ((offsetof(typeof(*ext4_inode), field) + \
854 sizeof((ext4_inode)->field)) \
855 <= (EXT4_GOOD_OLD_INODE_SIZE + \
856 (einode)->i_extra_isize)) \
857
858/*
859 * We use an encoding that preserves the times for extra epoch "00":
860 *
861 * extra msb of adjust for signed
862 * epoch 32-bit 32-bit tv_sec to
863 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range
864 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31
865 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19
866 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07
867 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25
868 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16
869 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04
870 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22
871 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10
872 *
873 * Note that previous versions of the kernel on 64-bit systems would
874 * incorrectly use extra epoch bits 1,1 for dates between 1901 and
875 * 1970. e2fsck will correct this, assuming that it is run on the
876 * affected filesystem before 2242.
877 */
878
879static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
880{
881 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
882 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
883}
884
885static inline void ext4_decode_extra_time(struct timespec64 *time,
886 __le32 extra)
887{
888 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
889 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
890 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
891}
892
893#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
894do { \
895 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\
896 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
897 (raw_inode)->xtime ## _extra = \
898 ext4_encode_extra_time(&(inode)->xtime); \
899 } \
900 else \
901 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \
902} while (0)
903
904#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
905do { \
906 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
907 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
908 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
909 (raw_inode)->xtime ## _extra = \
910 ext4_encode_extra_time(&(einode)->xtime); \
911} while (0)
912
913#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
914do { \
915 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
916 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \
917 ext4_decode_extra_time(&(inode)->xtime, \
918 raw_inode->xtime ## _extra); \
919 } \
920 else \
921 (inode)->xtime.tv_nsec = 0; \
922} while (0)
923
924
925#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
926do { \
927 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
928 (einode)->xtime.tv_sec = \
929 (signed)le32_to_cpu((raw_inode)->xtime); \
930 else \
931 (einode)->xtime.tv_sec = 0; \
932 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
933 ext4_decode_extra_time(&(einode)->xtime, \
934 raw_inode->xtime ## _extra); \
935 else \
936 (einode)->xtime.tv_nsec = 0; \
937} while (0)
938
939#define i_disk_version osd1.linux1.l_i_version
940
941#if defined(__KERNEL__) || defined(__linux__)
942#define i_reserved1 osd1.linux1.l_i_reserved1
943#define i_file_acl_high osd2.linux2.l_i_file_acl_high
944#define i_blocks_high osd2.linux2.l_i_blocks_high
945#define i_uid_low i_uid
946#define i_gid_low i_gid
947#define i_uid_high osd2.linux2.l_i_uid_high
948#define i_gid_high osd2.linux2.l_i_gid_high
949#define i_checksum_lo osd2.linux2.l_i_checksum_lo
950
951#elif defined(__GNU__)
952
953#define i_translator osd1.hurd1.h_i_translator
954#define i_uid_high osd2.hurd2.h_i_uid_high
955#define i_gid_high osd2.hurd2.h_i_gid_high
956#define i_author osd2.hurd2.h_i_author
957
958#elif defined(__masix__)
959
960#define i_reserved1 osd1.masix1.m_i_reserved1
961#define i_file_acl_high osd2.masix2.m_i_file_acl_high
962#define i_reserved2 osd2.masix2.m_i_reserved2
963
964#endif /* defined(__KERNEL__) || defined(__linux__) */
965
966#include "extents_status.h"
967
968/*
969 * Lock subclasses for i_data_sem in the ext4_inode_info structure.
970 *
971 * These are needed to avoid lockdep false positives when we need to
972 * allocate blocks to the quota inode during ext4_map_blocks(), while
973 * holding i_data_sem for a normal (non-quota) inode. Since we don't
974 * do quota tracking for the quota inode, this avoids deadlock (as
975 * well as infinite recursion, since it isn't turtles all the way
976 * down...)
977 *
978 * I_DATA_SEM_NORMAL - Used for most inodes
979 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode
980 * where the second inode has larger inode number
981 * than the first
982 * I_DATA_SEM_QUOTA - Used for quota inodes only
983 */
984enum {
985 I_DATA_SEM_NORMAL = 0,
986 I_DATA_SEM_OTHER,
987 I_DATA_SEM_QUOTA,
988};
989
990
991/*
992 * fourth extended file system inode data in memory
993 */
994struct ext4_inode_info {
995 __le32 i_data[15]; /* unconverted */
996 __u32 i_dtime;
997 ext4_fsblk_t i_file_acl;
998
999 /*
1000 * i_block_group is the number of the block group which contains
1001 * this file's inode. Constant across the lifetime of the inode,
1002 * it is used for making block allocation decisions - we try to
1003 * place a file's data blocks near its inode block, and new inodes
1004 * near to their parent directory's inode.
1005 */
1006 ext4_group_t i_block_group;
1007 ext4_lblk_t i_dir_start_lookup;
1008#if (BITS_PER_LONG < 64)
1009 unsigned long i_state_flags; /* Dynamic state flags */
1010#endif
1011 unsigned long i_flags;
1012
1013 /*
1014 * Extended attributes can be read independently of the main file
1015 * data. Taking i_mutex even when reading would cause contention
1016 * between readers of EAs and writers of regular file data, so
1017 * instead we synchronize on xattr_sem when reading or changing
1018 * EAs.
1019 */
1020 struct rw_semaphore xattr_sem;
1021
1022 struct list_head i_orphan; /* unlinked but open inodes */
1023
1024 /*
1025 * i_disksize keeps track of what the inode size is ON DISK, not
1026 * in memory. During truncate, i_size is set to the new size by
1027 * the VFS prior to calling ext4_truncate(), but the filesystem won't
1028 * set i_disksize to 0 until the truncate is actually under way.
1029 *
1030 * The intent is that i_disksize always represents the blocks which
1031 * are used by this file. This allows recovery to restart truncate
1032 * on orphans if we crash during truncate. We actually write i_disksize
1033 * into the on-disk inode when writing inodes out, instead of i_size.
1034 *
1035 * The only time when i_disksize and i_size may be different is when
1036 * a truncate is in progress. The only things which change i_disksize
1037 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1038 */
1039 loff_t i_disksize;
1040
1041 /*
1042 * i_data_sem is for serialising ext4_truncate() against
1043 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
1044 * data tree are chopped off during truncate. We can't do that in
1045 * ext4 because whenever we perform intermediate commits during
1046 * truncate, the inode and all the metadata blocks *must* be in a
1047 * consistent state which allows truncation of the orphans to restart
1048 * during recovery. Hence we must fix the get_block-vs-truncate race
1049 * by other means, so we have i_data_sem.
1050 */
1051 struct rw_semaphore i_data_sem;
1052 /*
1053 * i_mmap_sem is for serializing page faults with truncate / punch hole
1054 * operations. We have to make sure that new page cannot be faulted in
1055 * a section of the inode that is being punched. We cannot easily use
1056 * i_data_sem for this since we need protection for the whole punch
1057 * operation and i_data_sem ranks below transaction start so we have
1058 * to occasionally drop it.
1059 */
1060 struct rw_semaphore i_mmap_sem;
1061 struct inode vfs_inode;
1062 struct jbd2_inode *jinode;
1063
1064 spinlock_t i_raw_lock; /* protects updates to the raw inode */
1065
1066 /*
1067 * File creation time. Its function is same as that of
1068 * struct timespec64 i_{a,c,m}time in the generic inode.
1069 */
1070 struct timespec64 i_crtime;
1071
1072 /* mballoc */
1073 atomic_t i_prealloc_active;
1074 struct list_head i_prealloc_list;
1075 spinlock_t i_prealloc_lock;
1076
1077 /* extents status tree */
1078 struct ext4_es_tree i_es_tree;
1079 rwlock_t i_es_lock;
1080 struct list_head i_es_list;
1081 unsigned int i_es_all_nr; /* protected by i_es_lock */
1082 unsigned int i_es_shk_nr; /* protected by i_es_lock */
1083 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
1084 extents to shrink. Protected by
1085 i_es_lock */
1086
1087 /* ialloc */
1088 ext4_group_t i_last_alloc_group;
1089
1090 /* allocation reservation info for delalloc */
1091 /* In case of bigalloc, this refer to clusters rather than blocks */
1092 unsigned int i_reserved_data_blocks;
1093
1094 /* pending cluster reservations for bigalloc file systems */
1095 struct ext4_pending_tree i_pending_tree;
1096
1097 /* on-disk additional length */
1098 __u16 i_extra_isize;
1099
1100 /* Indicate the inline data space. */
1101 u16 i_inline_off;
1102 u16 i_inline_size;
1103
1104#ifdef CONFIG_QUOTA
1105 /* quota space reservation, managed internally by quota code */
1106 qsize_t i_reserved_quota;
1107#endif
1108
1109 /* Lock protecting lists below */
1110 spinlock_t i_completed_io_lock;
1111 /*
1112 * Completed IOs that need unwritten extents handling and have
1113 * transaction reserved
1114 */
1115 struct list_head i_rsv_conversion_list;
1116 struct work_struct i_rsv_conversion_work;
1117 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1118
1119 spinlock_t i_block_reservation_lock;
1120
1121 /*
1122 * Transactions that contain inode's metadata needed to complete
1123 * fsync and fdatasync, respectively.
1124 */
1125 tid_t i_sync_tid;
1126 tid_t i_datasync_tid;
1127
1128#ifdef CONFIG_QUOTA
1129 struct dquot *i_dquot[MAXQUOTAS];
1130#endif
1131
1132 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1133 __u32 i_csum_seed;
1134
1135 kprojid_t i_projid;
1136};
1137
1138/*
1139 * File system states
1140 */
1141#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
1142#define EXT4_ERROR_FS 0x0002 /* Errors detected */
1143#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
1144
1145/*
1146 * Misc. filesystem flags
1147 */
1148#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
1149#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
1150#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
1151
1152/*
1153 * Mount flags set via mount options or defaults
1154 */
1155#define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */
1156#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
1157#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
1158#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
1159#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
1160#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
1161#define EXT4_MOUNT_ERRORS_MASK 0x00070
1162#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
1163#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
1164#ifdef CONFIG_FS_DAX
1165#define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */
1166#else
1167#define EXT4_MOUNT_DAX_ALWAYS 0
1168#endif
1169#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
1170#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
1171#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
1172#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
1173#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
1174#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
1175#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
1176#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
1177#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
1178#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
1179#define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */
1180#define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota,
1181 * enable enforcement for hidden
1182 * quota files */
1183#define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable
1184 * enforcement for hidden quota
1185 * files */
1186#define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota
1187 * enforcement */
1188#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
1189#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
1190#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1191#define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */
1192#define EXT4_MOUNT_PREFETCH_BLOCK_BITMAPS 0x4000000
1193#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
1194#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
1195#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
1196#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
1197#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
1198
1199/*
1200 * Mount flags set either automatically (could not be set by mount option)
1201 * based on per file system feature or property or in special cases such as
1202 * distinguishing between explicit mount option definition and default.
1203 */
1204#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1205 specified delalloc */
1206#define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1207 size of blocksize * 8
1208 blocks */
1209#define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1210 file systems */
1211#define EXT4_MOUNT2_DAX_NEVER 0x00000008 /* Do not allow Direct Access */
1212#define EXT4_MOUNT2_DAX_INODE 0x00000010 /* For printing options only */
1213
1214#define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly
1215 specified journal checksum */
1216
1217#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1218 ~EXT4_MOUNT_##opt
1219#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1220 EXT4_MOUNT_##opt
1221#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1222 EXT4_MOUNT_##opt)
1223
1224#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1225 ~EXT4_MOUNT2_##opt
1226#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1227 EXT4_MOUNT2_##opt
1228#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1229 EXT4_MOUNT2_##opt)
1230
1231#define ext4_test_and_set_bit __test_and_set_bit_le
1232#define ext4_set_bit __set_bit_le
1233#define ext4_set_bit_atomic ext2_set_bit_atomic
1234#define ext4_test_and_clear_bit __test_and_clear_bit_le
1235#define ext4_clear_bit __clear_bit_le
1236#define ext4_clear_bit_atomic ext2_clear_bit_atomic
1237#define ext4_test_bit test_bit_le
1238#define ext4_find_next_zero_bit find_next_zero_bit_le
1239#define ext4_find_next_bit find_next_bit_le
1240
1241extern void ext4_set_bits(void *bm, int cur, int len);
1242
1243/*
1244 * Maximal mount counts between two filesystem checks
1245 */
1246#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1247#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1248
1249/*
1250 * Behaviour when detecting errors
1251 */
1252#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1253#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1254#define EXT4_ERRORS_PANIC 3 /* Panic */
1255#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1256
1257/* Metadata checksum algorithm codes */
1258#define EXT4_CRC32C_CHKSUM 1
1259
1260/*
1261 * Structure of the super block
1262 */
1263struct ext4_super_block {
1264/*00*/ __le32 s_inodes_count; /* Inodes count */
1265 __le32 s_blocks_count_lo; /* Blocks count */
1266 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1267 __le32 s_free_blocks_count_lo; /* Free blocks count */
1268/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1269 __le32 s_first_data_block; /* First Data Block */
1270 __le32 s_log_block_size; /* Block size */
1271 __le32 s_log_cluster_size; /* Allocation cluster size */
1272/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1273 __le32 s_clusters_per_group; /* # Clusters per group */
1274 __le32 s_inodes_per_group; /* # Inodes per group */
1275 __le32 s_mtime; /* Mount time */
1276/*30*/ __le32 s_wtime; /* Write time */
1277 __le16 s_mnt_count; /* Mount count */
1278 __le16 s_max_mnt_count; /* Maximal mount count */
1279 __le16 s_magic; /* Magic signature */
1280 __le16 s_state; /* File system state */
1281 __le16 s_errors; /* Behaviour when detecting errors */
1282 __le16 s_minor_rev_level; /* minor revision level */
1283/*40*/ __le32 s_lastcheck; /* time of last check */
1284 __le32 s_checkinterval; /* max. time between checks */
1285 __le32 s_creator_os; /* OS */
1286 __le32 s_rev_level; /* Revision level */
1287/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1288 __le16 s_def_resgid; /* Default gid for reserved blocks */
1289 /*
1290 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1291 *
1292 * Note: the difference between the compatible feature set and
1293 * the incompatible feature set is that if there is a bit set
1294 * in the incompatible feature set that the kernel doesn't
1295 * know about, it should refuse to mount the filesystem.
1296 *
1297 * e2fsck's requirements are more strict; if it doesn't know
1298 * about a feature in either the compatible or incompatible
1299 * feature set, it must abort and not try to meddle with
1300 * things it doesn't understand...
1301 */
1302 __le32 s_first_ino; /* First non-reserved inode */
1303 __le16 s_inode_size; /* size of inode structure */
1304 __le16 s_block_group_nr; /* block group # of this superblock */
1305 __le32 s_feature_compat; /* compatible feature set */
1306/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1307 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1308/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1309/*78*/ char s_volume_name[16]; /* volume name */
1310/*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */
1311/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1312 /*
1313 * Performance hints. Directory preallocation should only
1314 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1315 */
1316 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1317 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1318 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1319 /*
1320 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1321 */
1322/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1323/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1324 __le32 s_journal_dev; /* device number of journal file */
1325 __le32 s_last_orphan; /* start of list of inodes to delete */
1326 __le32 s_hash_seed[4]; /* HTREE hash seed */
1327 __u8 s_def_hash_version; /* Default hash version to use */
1328 __u8 s_jnl_backup_type;
1329 __le16 s_desc_size; /* size of group descriptor */
1330/*100*/ __le32 s_default_mount_opts;
1331 __le32 s_first_meta_bg; /* First metablock block group */
1332 __le32 s_mkfs_time; /* When the filesystem was created */
1333 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1334 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1335/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1336 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1337 __le32 s_free_blocks_count_hi; /* Free blocks count */
1338 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1339 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1340 __le32 s_flags; /* Miscellaneous flags */
1341 __le16 s_raid_stride; /* RAID stride */
1342 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1343 __le64 s_mmp_block; /* Block for multi-mount protection */
1344 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1345 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1346 __u8 s_checksum_type; /* metadata checksum algorithm used */
1347 __u8 s_encryption_level; /* versioning level for encryption */
1348 __u8 s_reserved_pad; /* Padding to next 32bits */
1349 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1350 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1351 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1352 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1353 snapshot's future use */
1354 __le32 s_snapshot_list; /* inode number of the head of the
1355 on-disk snapshot list */
1356#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1357 __le32 s_error_count; /* number of fs errors */
1358 __le32 s_first_error_time; /* first time an error happened */
1359 __le32 s_first_error_ino; /* inode involved in first error */
1360 __le64 s_first_error_block; /* block involved of first error */
1361 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */
1362 __le32 s_first_error_line; /* line number where error happened */
1363 __le32 s_last_error_time; /* most recent time of an error */
1364 __le32 s_last_error_ino; /* inode involved in last error */
1365 __le32 s_last_error_line; /* line number where error happened */
1366 __le64 s_last_error_block; /* block involved of last error */
1367 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */
1368#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1369 __u8 s_mount_opts[64];
1370 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1371 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1372 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1373 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1374 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
1375 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
1376 __le32 s_lpf_ino; /* Location of the lost+found inode */
1377 __le32 s_prj_quota_inum; /* inode for tracking project quota */
1378 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */
1379 __u8 s_wtime_hi;
1380 __u8 s_mtime_hi;
1381 __u8 s_mkfs_time_hi;
1382 __u8 s_lastcheck_hi;
1383 __u8 s_first_error_time_hi;
1384 __u8 s_last_error_time_hi;
1385 __u8 s_first_error_errcode;
1386 __u8 s_last_error_errcode;
1387 __le16 s_encoding; /* Filename charset encoding */
1388 __le16 s_encoding_flags; /* Filename charset encoding flags */
1389 __le32 s_reserved[95]; /* Padding to the end of the block */
1390 __le32 s_checksum; /* crc32c(superblock) */
1391};
1392
1393#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1394
1395#ifdef __KERNEL__
1396
1397/*
1398 * run-time mount flags
1399 */
1400#define EXT4_MF_MNTDIR_SAMPLED 0x0001
1401#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1402
1403#ifdef CONFIG_FS_ENCRYPTION
1404#define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_ctx.ctx != NULL)
1405#else
1406#define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1407#endif
1408
1409/* Number of quota types we support */
1410#define EXT4_MAXQUOTAS 3
1411
1412#define EXT4_ENC_UTF8_12_1 1
1413
1414/*
1415 * Flags for ext4_sb_info.s_encoding_flags.
1416 */
1417#define EXT4_ENC_STRICT_MODE_FL (1 << 0)
1418
1419#define ext4_has_strict_mode(sbi) \
1420 (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL)
1421
1422/*
1423 * fourth extended-fs super-block data in memory
1424 */
1425struct ext4_sb_info {
1426 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1427 unsigned long s_inodes_per_block;/* Number of inodes per block */
1428 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1429 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1430 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1431 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1432 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1433 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1434 ext4_group_t s_groups_count; /* Number of groups in the fs */
1435 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1436 unsigned long s_overhead; /* # of fs overhead clusters */
1437 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1438 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1439 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1440 struct buffer_head * s_sbh; /* Buffer containing the super block */
1441 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1442 struct buffer_head * __rcu *s_group_desc;
1443 unsigned int s_mount_opt;
1444 unsigned int s_mount_opt2;
1445 unsigned int s_mount_flags;
1446 unsigned int s_def_mount_opt;
1447 ext4_fsblk_t s_sb_block;
1448 atomic64_t s_resv_clusters;
1449 kuid_t s_resuid;
1450 kgid_t s_resgid;
1451 unsigned short s_mount_state;
1452 unsigned short s_pad;
1453 int s_addr_per_block_bits;
1454 int s_desc_per_block_bits;
1455 int s_inode_size;
1456 int s_first_ino;
1457 unsigned int s_inode_readahead_blks;
1458 unsigned int s_inode_goal;
1459 u32 s_hash_seed[4];
1460 int s_def_hash_version;
1461 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1462 struct percpu_counter s_freeclusters_counter;
1463 struct percpu_counter s_freeinodes_counter;
1464 struct percpu_counter s_dirs_counter;
1465 struct percpu_counter s_dirtyclusters_counter;
1466 struct blockgroup_lock *s_blockgroup_lock;
1467 struct proc_dir_entry *s_proc;
1468 struct kobject s_kobj;
1469 struct completion s_kobj_unregister;
1470 struct super_block *s_sb;
1471#ifdef CONFIG_UNICODE
1472 struct unicode_map *s_encoding;
1473 __u16 s_encoding_flags;
1474#endif
1475
1476 /* Journaling */
1477 struct journal_s *s_journal;
1478 struct list_head s_orphan;
1479 struct mutex s_orphan_lock;
1480 unsigned long s_ext4_flags; /* Ext4 superblock flags */
1481 unsigned long s_commit_interval;
1482 u32 s_max_batch_time;
1483 u32 s_min_batch_time;
1484 struct block_device *journal_bdev;
1485#ifdef CONFIG_QUOTA
1486 /* Names of quota files with journalled quota */
1487 char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1488 int s_jquota_fmt; /* Format of quota to use */
1489#endif
1490 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1491 struct ext4_system_blocks __rcu *system_blks;
1492
1493#ifdef EXTENTS_STATS
1494 /* ext4 extents stats */
1495 unsigned long s_ext_min;
1496 unsigned long s_ext_max;
1497 unsigned long s_depth_max;
1498 spinlock_t s_ext_stats_lock;
1499 unsigned long s_ext_blocks;
1500 unsigned long s_ext_extents;
1501#endif
1502
1503 /* for buddy allocator */
1504 struct ext4_group_info ** __rcu *s_group_info;
1505 struct inode *s_buddy_cache;
1506 spinlock_t s_md_lock;
1507 unsigned short *s_mb_offsets;
1508 unsigned int *s_mb_maxs;
1509 unsigned int s_group_info_size;
1510 unsigned int s_mb_free_pending;
1511 struct list_head s_freed_data_list; /* List of blocks to be freed
1512 after commit completed */
1513
1514 /* tunables */
1515 unsigned long s_stripe;
1516 unsigned int s_mb_stream_request;
1517 unsigned int s_mb_max_to_scan;
1518 unsigned int s_mb_min_to_scan;
1519 unsigned int s_mb_stats;
1520 unsigned int s_mb_order2_reqs;
1521 unsigned int s_mb_group_prealloc;
1522 unsigned int s_mb_max_inode_prealloc;
1523 unsigned int s_max_dir_size_kb;
1524 /* where last allocation was done - for stream allocation */
1525 unsigned long s_mb_last_group;
1526 unsigned long s_mb_last_start;
1527 unsigned int s_mb_prefetch;
1528 unsigned int s_mb_prefetch_limit;
1529
1530 /* stats for buddy allocator */
1531 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1532 atomic_t s_bal_success; /* we found long enough chunks */
1533 atomic_t s_bal_allocated; /* in blocks */
1534 atomic_t s_bal_ex_scanned; /* total extents scanned */
1535 atomic_t s_bal_goals; /* goal hits */
1536 atomic_t s_bal_breaks; /* too long searches */
1537 atomic_t s_bal_2orders; /* 2^order hits */
1538 spinlock_t s_bal_lock;
1539 unsigned long s_mb_buddies_generated;
1540 unsigned long long s_mb_generation_time;
1541 atomic_t s_mb_lost_chunks;
1542 atomic_t s_mb_preallocated;
1543 atomic_t s_mb_discarded;
1544 atomic_t s_lock_busy;
1545
1546 /* locality groups */
1547 struct ext4_locality_group __percpu *s_locality_groups;
1548
1549 /* for write statistics */
1550 unsigned long s_sectors_written_start;
1551 u64 s_kbytes_written;
1552
1553 /* the size of zero-out chunk */
1554 unsigned int s_extent_max_zeroout_kb;
1555
1556 unsigned int s_log_groups_per_flex;
1557 struct flex_groups * __rcu *s_flex_groups;
1558 ext4_group_t s_flex_groups_allocated;
1559
1560 /* workqueue for reserved extent conversions (buffered io) */
1561 struct workqueue_struct *rsv_conversion_wq;
1562
1563 /* timer for periodic error stats printing */
1564 struct timer_list s_err_report;
1565
1566 /* Lazy inode table initialization info */
1567 struct ext4_li_request *s_li_request;
1568 /* Wait multiplier for lazy initialization thread */
1569 unsigned int s_li_wait_mult;
1570
1571 /* Kernel thread for multiple mount protection */
1572 struct task_struct *s_mmp_tsk;
1573
1574 /* record the last minlen when FITRIM is called. */
1575 atomic_t s_last_trim_minblks;
1576
1577 /* Reference to checksum algorithm driver via cryptoapi */
1578 struct crypto_shash *s_chksum_driver;
1579
1580 /* Precomputed FS UUID checksum for seeding other checksums */
1581 __u32 s_csum_seed;
1582
1583 /* Reclaim extents from extent status tree */
1584 struct shrinker s_es_shrinker;
1585 struct list_head s_es_list; /* List of inodes with reclaimable extents */
1586 long s_es_nr_inode;
1587 struct ext4_es_stats s_es_stats;
1588 struct mb_cache *s_ea_block_cache;
1589 struct mb_cache *s_ea_inode_cache;
1590 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1591
1592 /* Ratelimit ext4 messages. */
1593 struct ratelimit_state s_err_ratelimit_state;
1594 struct ratelimit_state s_warning_ratelimit_state;
1595 struct ratelimit_state s_msg_ratelimit_state;
1596 atomic_t s_warning_count;
1597 atomic_t s_msg_count;
1598
1599 /* Encryption context for '-o test_dummy_encryption' */
1600 struct fscrypt_dummy_context s_dummy_enc_ctx;
1601
1602 /*
1603 * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1604 * or EXTENTS flag.
1605 */
1606 struct percpu_rw_semaphore s_writepages_rwsem;
1607 struct dax_device *s_daxdev;
1608#ifdef CONFIG_EXT4_DEBUG
1609 unsigned long s_simulate_fail;
1610#endif
1611 /* Record the errseq of the backing block device */
1612 errseq_t s_bdev_wb_err;
1613 spinlock_t s_bdev_wb_lock;
1614};
1615
1616static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1617{
1618 return sb->s_fs_info;
1619}
1620static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1621{
1622 return container_of(inode, struct ext4_inode_info, vfs_inode);
1623}
1624
1625static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1626{
1627 return ino == EXT4_ROOT_INO ||
1628 (ino >= EXT4_FIRST_INO(sb) &&
1629 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1630}
1631
1632/*
1633 * Returns: sbi->field[index]
1634 * Used to access an array element from the following sbi fields which require
1635 * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1636 * - s_group_desc
1637 * - s_group_info
1638 * - s_flex_group
1639 */
1640#define sbi_array_rcu_deref(sbi, field, index) \
1641({ \
1642 typeof(*((sbi)->field)) _v; \
1643 rcu_read_lock(); \
1644 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \
1645 rcu_read_unlock(); \
1646 _v; \
1647})
1648
1649/*
1650 * Simulate_fail codes
1651 */
1652#define EXT4_SIM_BBITMAP_EIO 1
1653#define EXT4_SIM_BBITMAP_CRC 2
1654#define EXT4_SIM_IBITMAP_EIO 3
1655#define EXT4_SIM_IBITMAP_CRC 4
1656#define EXT4_SIM_INODE_EIO 5
1657#define EXT4_SIM_INODE_CRC 6
1658#define EXT4_SIM_DIRBLOCK_EIO 7
1659#define EXT4_SIM_DIRBLOCK_CRC 8
1660
1661static inline bool ext4_simulate_fail(struct super_block *sb,
1662 unsigned long code)
1663{
1664#ifdef CONFIG_EXT4_DEBUG
1665 struct ext4_sb_info *sbi = EXT4_SB(sb);
1666
1667 if (unlikely(sbi->s_simulate_fail == code)) {
1668 sbi->s_simulate_fail = 0;
1669 return true;
1670 }
1671#endif
1672 return false;
1673}
1674
1675static inline void ext4_simulate_fail_bh(struct super_block *sb,
1676 struct buffer_head *bh,
1677 unsigned long code)
1678{
1679 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1680 clear_buffer_uptodate(bh);
1681}
1682
1683/*
1684 * Error number codes for s_{first,last}_error_errno
1685 *
1686 * Linux errno numbers are architecture specific, so we need to translate
1687 * them into something which is architecture independent. We don't define
1688 * codes for all errno's; just the ones which are most likely to be the cause
1689 * of an ext4_error() call.
1690 */
1691#define EXT4_ERR_UNKNOWN 1
1692#define EXT4_ERR_EIO 2
1693#define EXT4_ERR_ENOMEM 3
1694#define EXT4_ERR_EFSBADCRC 4
1695#define EXT4_ERR_EFSCORRUPTED 5
1696#define EXT4_ERR_ENOSPC 6
1697#define EXT4_ERR_ENOKEY 7
1698#define EXT4_ERR_EROFS 8
1699#define EXT4_ERR_EFBIG 9
1700#define EXT4_ERR_EEXIST 10
1701#define EXT4_ERR_ERANGE 11
1702#define EXT4_ERR_EOVERFLOW 12
1703#define EXT4_ERR_EBUSY 13
1704#define EXT4_ERR_ENOTDIR 14
1705#define EXT4_ERR_ENOTEMPTY 15
1706#define EXT4_ERR_ESHUTDOWN 16
1707#define EXT4_ERR_EFAULT 17
1708
1709/*
1710 * Inode dynamic state flags
1711 */
1712enum {
1713 EXT4_STATE_JDATA, /* journaled data exists */
1714 EXT4_STATE_NEW, /* inode is newly created */
1715 EXT4_STATE_XATTR, /* has in-inode xattrs */
1716 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1717 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1718 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1719 EXT4_STATE_NEWENTRY, /* File just added to dir */
1720 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1721 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1722 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */
1723 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */
1724};
1725
1726#define EXT4_INODE_BIT_FNS(name, field, offset) \
1727static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1728{ \
1729 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1730} \
1731static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1732{ \
1733 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1734} \
1735static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1736{ \
1737 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1738}
1739
1740/* Add these declarations here only so that these functions can be
1741 * found by name. Otherwise, they are very hard to locate. */
1742static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1743static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1744static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1745EXT4_INODE_BIT_FNS(flag, flags, 0)
1746
1747/* Add these declarations here only so that these functions can be
1748 * found by name. Otherwise, they are very hard to locate. */
1749static inline int ext4_test_inode_state(struct inode *inode, int bit);
1750static inline void ext4_set_inode_state(struct inode *inode, int bit);
1751static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1752#if (BITS_PER_LONG < 64)
1753EXT4_INODE_BIT_FNS(state, state_flags, 0)
1754
1755static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1756{
1757 (ei)->i_state_flags = 0;
1758}
1759#else
1760EXT4_INODE_BIT_FNS(state, flags, 32)
1761
1762static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1763{
1764 /* We depend on the fact that callers will set i_flags */
1765}
1766#endif
1767#else
1768/* Assume that user mode programs are passing in an ext4fs superblock, not
1769 * a kernel struct super_block. This will allow us to call the feature-test
1770 * macros from user land. */
1771#define EXT4_SB(sb) (sb)
1772#endif
1773
1774static inline bool ext4_verity_in_progress(struct inode *inode)
1775{
1776 return IS_ENABLED(CONFIG_FS_VERITY) &&
1777 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1778}
1779
1780#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1781
1782/*
1783 * Codes for operating systems
1784 */
1785#define EXT4_OS_LINUX 0
1786#define EXT4_OS_HURD 1
1787#define EXT4_OS_MASIX 2
1788#define EXT4_OS_FREEBSD 3
1789#define EXT4_OS_LITES 4
1790
1791/*
1792 * Revision levels
1793 */
1794#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1795#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1796
1797#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1798#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1799
1800#define EXT4_GOOD_OLD_INODE_SIZE 128
1801
1802#define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN)
1803#define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX
1804#define EXT4_TIMESTAMP_MIN S32_MIN
1805
1806/*
1807 * Feature set definitions
1808 */
1809
1810#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1811#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1812#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1813#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1814#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1815#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1816#define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1817#define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
1818
1819#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1820#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1821#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1822#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1823#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1824#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1825#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1826#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1827#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1828/*
1829 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1830 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1831 * all other data structures' checksums. However, the METADATA_CSUM and
1832 * GDT_CSUM bits are mutually exclusive.
1833 */
1834#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1835#define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
1836#define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
1837#define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
1838
1839#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1840#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1841#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1842#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1843#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1844#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1845#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1846#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1847#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1848#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1849#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1850#define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
1851#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1852#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1853#define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
1854#define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000
1855
1856extern void ext4_update_dynamic_rev(struct super_block *sb);
1857
1858#define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1859static inline bool ext4_has_feature_##name(struct super_block *sb) \
1860{ \
1861 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1862 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1863} \
1864static inline void ext4_set_feature_##name(struct super_block *sb) \
1865{ \
1866 ext4_update_dynamic_rev(sb); \
1867 EXT4_SB(sb)->s_es->s_feature_compat |= \
1868 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1869} \
1870static inline void ext4_clear_feature_##name(struct super_block *sb) \
1871{ \
1872 EXT4_SB(sb)->s_es->s_feature_compat &= \
1873 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1874}
1875
1876#define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1877static inline bool ext4_has_feature_##name(struct super_block *sb) \
1878{ \
1879 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1880 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1881} \
1882static inline void ext4_set_feature_##name(struct super_block *sb) \
1883{ \
1884 ext4_update_dynamic_rev(sb); \
1885 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1886 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1887} \
1888static inline void ext4_clear_feature_##name(struct super_block *sb) \
1889{ \
1890 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1891 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1892}
1893
1894#define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1895static inline bool ext4_has_feature_##name(struct super_block *sb) \
1896{ \
1897 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1898 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1899} \
1900static inline void ext4_set_feature_##name(struct super_block *sb) \
1901{ \
1902 ext4_update_dynamic_rev(sb); \
1903 EXT4_SB(sb)->s_es->s_feature_incompat |= \
1904 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1905} \
1906static inline void ext4_clear_feature_##name(struct super_block *sb) \
1907{ \
1908 EXT4_SB(sb)->s_es->s_feature_incompat &= \
1909 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1910}
1911
1912EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
1913EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES)
1914EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL)
1915EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR)
1916EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE)
1917EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
1918EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
1919EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES)
1920
1921EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
1922EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
1923EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR)
1924EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE)
1925EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM)
1926EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK)
1927EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE)
1928EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA)
1929EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC)
1930EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
1931EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
1932EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
1933EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY)
1934
1935EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
1936EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
1937EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER)
1938EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV)
1939EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG)
1940EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS)
1941EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
1942EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP)
1943EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG)
1944EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE)
1945EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA)
1946EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
1947EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
1948EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
1949EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
1950EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD)
1951
1952#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1953#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1954 EXT4_FEATURE_INCOMPAT_META_BG)
1955#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1956 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1957 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1958
1959#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1960#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1961 EXT4_FEATURE_INCOMPAT_RECOVER| \
1962 EXT4_FEATURE_INCOMPAT_META_BG)
1963#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1964 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1965 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1966
1967#define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1968#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1969 EXT4_FEATURE_INCOMPAT_RECOVER| \
1970 EXT4_FEATURE_INCOMPAT_META_BG| \
1971 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1972 EXT4_FEATURE_INCOMPAT_64BIT| \
1973 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1974 EXT4_FEATURE_INCOMPAT_EA_INODE| \
1975 EXT4_FEATURE_INCOMPAT_MMP | \
1976 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1977 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1978 EXT4_FEATURE_INCOMPAT_CASEFOLD | \
1979 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
1980 EXT4_FEATURE_INCOMPAT_LARGEDIR)
1981#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1982 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1983 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1984 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1985 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1986 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1987 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1988 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1989 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1990 EXT4_FEATURE_RO_COMPAT_QUOTA |\
1991 EXT4_FEATURE_RO_COMPAT_PROJECT |\
1992 EXT4_FEATURE_RO_COMPAT_VERITY)
1993
1994#define EXTN_FEATURE_FUNCS(ver) \
1995static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1996{ \
1997 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1998 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1999} \
2000static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2001{ \
2002 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2003 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2004} \
2005static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2006{ \
2007 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2008 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2009}
2010
2011EXTN_FEATURE_FUNCS(2)
2012EXTN_FEATURE_FUNCS(3)
2013EXTN_FEATURE_FUNCS(4)
2014
2015static inline bool ext4_has_compat_features(struct super_block *sb)
2016{
2017 return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2018}
2019static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2020{
2021 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2022}
2023static inline bool ext4_has_incompat_features(struct super_block *sb)
2024{
2025 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2026}
2027
2028/*
2029 * Superblock flags
2030 */
2031#define EXT4_FLAGS_RESIZING 0
2032#define EXT4_FLAGS_SHUTDOWN 1
2033#define EXT4_FLAGS_BDEV_IS_DAX 2
2034
2035static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
2036{
2037 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
2038}
2039
2040
2041/*
2042 * Default values for user and/or group using reserved blocks
2043 */
2044#define EXT4_DEF_RESUID 0
2045#define EXT4_DEF_RESGID 0
2046
2047/*
2048 * Default project ID
2049 */
2050#define EXT4_DEF_PROJID 0
2051
2052#define EXT4_DEF_INODE_READAHEAD_BLKS 32
2053
2054/*
2055 * Default mount options
2056 */
2057#define EXT4_DEFM_DEBUG 0x0001
2058#define EXT4_DEFM_BSDGROUPS 0x0002
2059#define EXT4_DEFM_XATTR_USER 0x0004
2060#define EXT4_DEFM_ACL 0x0008
2061#define EXT4_DEFM_UID16 0x0010
2062#define EXT4_DEFM_JMODE 0x0060
2063#define EXT4_DEFM_JMODE_DATA 0x0020
2064#define EXT4_DEFM_JMODE_ORDERED 0x0040
2065#define EXT4_DEFM_JMODE_WBACK 0x0060
2066#define EXT4_DEFM_NOBARRIER 0x0100
2067#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2068#define EXT4_DEFM_DISCARD 0x0400
2069#define EXT4_DEFM_NODELALLOC 0x0800
2070
2071/*
2072 * Default journal batch times
2073 */
2074#define EXT4_DEF_MIN_BATCH_TIME 0
2075#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
2076
2077/*
2078 * Minimum number of groups in a flexgroup before we separate out
2079 * directories into the first block group of a flexgroup
2080 */
2081#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
2082
2083/*
2084 * Structure of a directory entry
2085 */
2086#define EXT4_NAME_LEN 255
2087
2088struct ext4_dir_entry {
2089 __le32 inode; /* Inode number */
2090 __le16 rec_len; /* Directory entry length */
2091 __le16 name_len; /* Name length */
2092 char name[EXT4_NAME_LEN]; /* File name */
2093};
2094
2095/*
2096 * The new version of the directory entry. Since EXT4 structures are
2097 * stored in intel byte order, and the name_len field could never be
2098 * bigger than 255 chars, it's safe to reclaim the extra byte for the
2099 * file_type field.
2100 */
2101struct ext4_dir_entry_2 {
2102 __le32 inode; /* Inode number */
2103 __le16 rec_len; /* Directory entry length */
2104 __u8 name_len; /* Name length */
2105 __u8 file_type; /* See file type macros EXT4_FT_* below */
2106 char name[EXT4_NAME_LEN]; /* File name */
2107};
2108
2109/*
2110 * This is a bogus directory entry at the end of each leaf block that
2111 * records checksums.
2112 */
2113struct ext4_dir_entry_tail {
2114 __le32 det_reserved_zero1; /* Pretend to be unused */
2115 __le16 det_rec_len; /* 12 */
2116 __u8 det_reserved_zero2; /* Zero name length */
2117 __u8 det_reserved_ft; /* 0xDE, fake file type */
2118 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
2119};
2120
2121#define EXT4_DIRENT_TAIL(block, blocksize) \
2122 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2123 ((blocksize) - \
2124 sizeof(struct ext4_dir_entry_tail))))
2125
2126/*
2127 * Ext4 directory file types. Only the low 3 bits are used. The
2128 * other bits are reserved for now.
2129 */
2130#define EXT4_FT_UNKNOWN 0
2131#define EXT4_FT_REG_FILE 1
2132#define EXT4_FT_DIR 2
2133#define EXT4_FT_CHRDEV 3
2134#define EXT4_FT_BLKDEV 4
2135#define EXT4_FT_FIFO 5
2136#define EXT4_FT_SOCK 6
2137#define EXT4_FT_SYMLINK 7
2138
2139#define EXT4_FT_MAX 8
2140
2141#define EXT4_FT_DIR_CSUM 0xDE
2142
2143/*
2144 * EXT4_DIR_PAD defines the directory entries boundaries
2145 *
2146 * NOTE: It must be a multiple of 4
2147 */
2148#define EXT4_DIR_PAD 4
2149#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
2150#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
2151 ~EXT4_DIR_ROUND)
2152#define EXT4_MAX_REC_LEN ((1<<16)-1)
2153
2154/*
2155 * If we ever get support for fs block sizes > page_size, we'll need
2156 * to remove the #if statements in the next two functions...
2157 */
2158static inline unsigned int
2159ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2160{
2161 unsigned len = le16_to_cpu(dlen);
2162
2163#if (PAGE_SIZE >= 65536)
2164 if (len == EXT4_MAX_REC_LEN || len == 0)
2165 return blocksize;
2166 return (len & 65532) | ((len & 3) << 16);
2167#else
2168 return len;
2169#endif
2170}
2171
2172static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2173{
2174 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2175 BUG();
2176#if (PAGE_SIZE >= 65536)
2177 if (len < 65536)
2178 return cpu_to_le16(len);
2179 if (len == blocksize) {
2180 if (blocksize == 65536)
2181 return cpu_to_le16(EXT4_MAX_REC_LEN);
2182 else
2183 return cpu_to_le16(0);
2184 }
2185 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2186#else
2187 return cpu_to_le16(len);
2188#endif
2189}
2190
2191/*
2192 * Hash Tree Directory indexing
2193 * (c) Daniel Phillips, 2001
2194 */
2195
2196#define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2197 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2198#define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2199 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2200#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2201
2202/* Legal values for the dx_root hash_version field: */
2203
2204#define DX_HASH_LEGACY 0
2205#define DX_HASH_HALF_MD4 1
2206#define DX_HASH_TEA 2
2207#define DX_HASH_LEGACY_UNSIGNED 3
2208#define DX_HASH_HALF_MD4_UNSIGNED 4
2209#define DX_HASH_TEA_UNSIGNED 5
2210
2211static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2212 const void *address, unsigned int length)
2213{
2214 struct {
2215 struct shash_desc shash;
2216 char ctx[4];
2217 } desc;
2218
2219 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2220
2221 desc.shash.tfm = sbi->s_chksum_driver;
2222 *(u32 *)desc.ctx = crc;
2223
2224 BUG_ON(crypto_shash_update(&desc.shash, address, length));
2225
2226 return *(u32 *)desc.ctx;
2227}
2228
2229#ifdef __KERNEL__
2230
2231/* hash info structure used by the directory hash */
2232struct dx_hash_info
2233{
2234 u32 hash;
2235 u32 minor_hash;
2236 int hash_version;
2237 u32 *seed;
2238};
2239
2240
2241/* 32 and 64 bit signed EOF for dx directories */
2242#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
2243#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
2244
2245
2246/*
2247 * Control parameters used by ext4_htree_next_block
2248 */
2249#define HASH_NB_ALWAYS 1
2250
2251struct ext4_filename {
2252 const struct qstr *usr_fname;
2253 struct fscrypt_str disk_name;
2254 struct dx_hash_info hinfo;
2255#ifdef CONFIG_FS_ENCRYPTION
2256 struct fscrypt_str crypto_buf;
2257#endif
2258#ifdef CONFIG_UNICODE
2259 struct fscrypt_str cf_name;
2260#endif
2261};
2262
2263#define fname_name(p) ((p)->disk_name.name)
2264#define fname_len(p) ((p)->disk_name.len)
2265
2266/*
2267 * Describe an inode's exact location on disk and in memory
2268 */
2269struct ext4_iloc
2270{
2271 struct buffer_head *bh;
2272 unsigned long offset;
2273 ext4_group_t block_group;
2274};
2275
2276static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2277{
2278 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2279}
2280
2281static inline bool ext4_is_quota_file(struct inode *inode)
2282{
2283 return IS_NOQUOTA(inode) &&
2284 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2285}
2286
2287/*
2288 * This structure is stuffed into the struct file's private_data field
2289 * for directories. It is where we put information so that we can do
2290 * readdir operations in hash tree order.
2291 */
2292struct dir_private_info {
2293 struct rb_root root;
2294 struct rb_node *curr_node;
2295 struct fname *extra_fname;
2296 loff_t last_pos;
2297 __u32 curr_hash;
2298 __u32 curr_minor_hash;
2299 __u32 next_hash;
2300};
2301
2302/* calculate the first block number of the group */
2303static inline ext4_fsblk_t
2304ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2305{
2306 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2307 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2308}
2309
2310/*
2311 * Special error return code only used by dx_probe() and its callers.
2312 */
2313#define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
2314
2315/* htree levels for ext4 */
2316#define EXT4_HTREE_LEVEL_COMPAT 2
2317#define EXT4_HTREE_LEVEL 3
2318
2319static inline int ext4_dir_htree_level(struct super_block *sb)
2320{
2321 return ext4_has_feature_largedir(sb) ?
2322 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2323}
2324
2325/*
2326 * Timeout and state flag for lazy initialization inode thread.
2327 */
2328#define EXT4_DEF_LI_WAIT_MULT 10
2329#define EXT4_DEF_LI_MAX_START_DELAY 5
2330#define EXT4_LAZYINIT_QUIT 0x0001
2331#define EXT4_LAZYINIT_RUNNING 0x0002
2332
2333/*
2334 * Lazy inode table initialization info
2335 */
2336struct ext4_lazy_init {
2337 unsigned long li_state;
2338 struct list_head li_request_list;
2339 struct mutex li_list_mtx;
2340};
2341
2342enum ext4_li_mode {
2343 EXT4_LI_MODE_PREFETCH_BBITMAP,
2344 EXT4_LI_MODE_ITABLE,
2345};
2346
2347struct ext4_li_request {
2348 struct super_block *lr_super;
2349 enum ext4_li_mode lr_mode;
2350 ext4_group_t lr_first_not_zeroed;
2351 ext4_group_t lr_next_group;
2352 struct list_head lr_request;
2353 unsigned long lr_next_sched;
2354 unsigned long lr_timeout;
2355};
2356
2357struct ext4_features {
2358 struct kobject f_kobj;
2359 struct completion f_kobj_unregister;
2360};
2361
2362/*
2363 * This structure will be used for multiple mount protection. It will be
2364 * written into the block number saved in the s_mmp_block field in the
2365 * superblock. Programs that check MMP should assume that if
2366 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2367 * to use the filesystem, regardless of how old the timestamp is.
2368 */
2369#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
2370#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2371#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
2372#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
2373
2374struct mmp_struct {
2375 __le32 mmp_magic; /* Magic number for MMP */
2376 __le32 mmp_seq; /* Sequence no. updated periodically */
2377
2378 /*
2379 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2380 * purposes and do not affect the correctness of the algorithm
2381 */
2382 __le64 mmp_time; /* Time last updated */
2383 char mmp_nodename[64]; /* Node which last updated MMP block */
2384 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
2385
2386 /*
2387 * mmp_check_interval is used to verify if the MMP block has been
2388 * updated on the block device. The value is updated based on the
2389 * maximum time to write the MMP block during an update cycle.
2390 */
2391 __le16 mmp_check_interval;
2392
2393 __le16 mmp_pad1;
2394 __le32 mmp_pad2[226];
2395 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
2396};
2397
2398/* arguments passed to the mmp thread */
2399struct mmpd_data {
2400 struct buffer_head *bh; /* bh from initial read_mmp_block() */
2401 struct super_block *sb; /* super block of the fs */
2402};
2403
2404/*
2405 * Check interval multiplier
2406 * The MMP block is written every update interval and initially checked every
2407 * update interval x the multiplier (the value is then adapted based on the
2408 * write latency). The reason is that writes can be delayed under load and we
2409 * don't want readers to incorrectly assume that the filesystem is no longer
2410 * in use.
2411 */
2412#define EXT4_MMP_CHECK_MULT 2UL
2413
2414/*
2415 * Minimum interval for MMP checking in seconds.
2416 */
2417#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
2418
2419/*
2420 * Maximum interval for MMP checking in seconds.
2421 */
2422#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
2423
2424/*
2425 * Function prototypes
2426 */
2427
2428/*
2429 * Ok, these declarations are also in <linux/kernel.h> but none of the
2430 * ext4 source programs needs to include it so they are duplicated here.
2431 */
2432# define NORET_TYPE /**/
2433# define ATTRIB_NORET __attribute__((noreturn))
2434# define NORET_AND noreturn,
2435
2436/* bitmap.c */
2437extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2438void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2439 struct ext4_group_desc *gdp,
2440 struct buffer_head *bh, int sz);
2441int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2442 struct ext4_group_desc *gdp,
2443 struct buffer_head *bh, int sz);
2444void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2445 struct ext4_group_desc *gdp,
2446 struct buffer_head *bh);
2447int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2448 struct ext4_group_desc *gdp,
2449 struct buffer_head *bh);
2450
2451/* balloc.c */
2452extern void ext4_get_group_no_and_offset(struct super_block *sb,
2453 ext4_fsblk_t blocknr,
2454 ext4_group_t *blockgrpp,
2455 ext4_grpblk_t *offsetp);
2456extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2457 ext4_fsblk_t block);
2458
2459extern unsigned int ext4_block_group(struct super_block *sb,
2460 ext4_fsblk_t blocknr);
2461extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2462 ext4_fsblk_t blocknr);
2463extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2464extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2465 ext4_group_t group);
2466extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2467 ext4_fsblk_t goal,
2468 unsigned int flags,
2469 unsigned long *count,
2470 int *errp);
2471extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2472 s64 nclusters, unsigned int flags);
2473extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2474extern void ext4_check_blocks_bitmap(struct super_block *);
2475extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2476 ext4_group_t block_group,
2477 struct buffer_head ** bh);
2478extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2479
2480extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2481 ext4_group_t block_group,
2482 bool ignore_locked);
2483extern int ext4_wait_block_bitmap(struct super_block *sb,
2484 ext4_group_t block_group,
2485 struct buffer_head *bh);
2486extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2487 ext4_group_t block_group);
2488extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2489 ext4_group_t block_group,
2490 struct ext4_group_desc *gdp);
2491ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2492
2493#ifdef CONFIG_UNICODE
2494extern void ext4_fname_setup_ci_filename(struct inode *dir,
2495 const struct qstr *iname,
2496 struct fscrypt_str *fname);
2497#endif
2498
2499#ifdef CONFIG_FS_ENCRYPTION
2500static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2501 const struct fscrypt_name *src)
2502{
2503 memset(dst, 0, sizeof(*dst));
2504
2505 dst->usr_fname = src->usr_fname;
2506 dst->disk_name = src->disk_name;
2507 dst->hinfo.hash = src->hash;
2508 dst->hinfo.minor_hash = src->minor_hash;
2509 dst->crypto_buf = src->crypto_buf;
2510}
2511
2512static inline int ext4_fname_setup_filename(struct inode *dir,
2513 const struct qstr *iname,
2514 int lookup,
2515 struct ext4_filename *fname)
2516{
2517 struct fscrypt_name name;
2518 int err;
2519
2520 err = fscrypt_setup_filename(dir, iname, lookup, &name);
2521 if (err)
2522 return err;
2523
2524 ext4_fname_from_fscrypt_name(fname, &name);
2525
2526#ifdef CONFIG_UNICODE
2527 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2528#endif
2529 return 0;
2530}
2531
2532static inline int ext4_fname_prepare_lookup(struct inode *dir,
2533 struct dentry *dentry,
2534 struct ext4_filename *fname)
2535{
2536 struct fscrypt_name name;
2537 int err;
2538
2539 err = fscrypt_prepare_lookup(dir, dentry, &name);
2540 if (err)
2541 return err;
2542
2543 ext4_fname_from_fscrypt_name(fname, &name);
2544
2545#ifdef CONFIG_UNICODE
2546 ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name);
2547#endif
2548 return 0;
2549}
2550
2551static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2552{
2553 struct fscrypt_name name;
2554
2555 name.crypto_buf = fname->crypto_buf;
2556 fscrypt_free_filename(&name);
2557
2558 fname->crypto_buf.name = NULL;
2559 fname->usr_fname = NULL;
2560 fname->disk_name.name = NULL;
2561
2562#ifdef CONFIG_UNICODE
2563 kfree(fname->cf_name.name);
2564 fname->cf_name.name = NULL;
2565#endif
2566}
2567#else /* !CONFIG_FS_ENCRYPTION */
2568static inline int ext4_fname_setup_filename(struct inode *dir,
2569 const struct qstr *iname,
2570 int lookup,
2571 struct ext4_filename *fname)
2572{
2573 fname->usr_fname = iname;
2574 fname->disk_name.name = (unsigned char *) iname->name;
2575 fname->disk_name.len = iname->len;
2576
2577#ifdef CONFIG_UNICODE
2578 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2579#endif
2580
2581 return 0;
2582}
2583
2584static inline int ext4_fname_prepare_lookup(struct inode *dir,
2585 struct dentry *dentry,
2586 struct ext4_filename *fname)
2587{
2588 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2589}
2590
2591static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2592{
2593#ifdef CONFIG_UNICODE
2594 kfree(fname->cf_name.name);
2595 fname->cf_name.name = NULL;
2596#endif
2597}
2598#endif /* !CONFIG_FS_ENCRYPTION */
2599
2600/* dir.c */
2601extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2602 struct file *,
2603 struct ext4_dir_entry_2 *,
2604 struct buffer_head *, char *, int,
2605 unsigned int);
2606#define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2607 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2608 (de), (bh), (buf), (size), (offset)))
2609extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2610 __u32 minor_hash,
2611 struct ext4_dir_entry_2 *dirent,
2612 struct fscrypt_str *ent_name);
2613extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2614extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2615 struct buffer_head *bh,
2616 void *buf, int buf_size,
2617 struct ext4_filename *fname,
2618 struct ext4_dir_entry_2 **dest_de);
2619void ext4_insert_dentry(struct inode *inode,
2620 struct ext4_dir_entry_2 *de,
2621 int buf_size,
2622 struct ext4_filename *fname);
2623static inline void ext4_update_dx_flag(struct inode *inode)
2624{
2625 if (!ext4_has_feature_dir_index(inode->i_sb)) {
2626 /* ext4_iget() should have caught this... */
2627 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2628 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2629 }
2630}
2631static const unsigned char ext4_filetype_table[] = {
2632 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2633};
2634
2635static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2636{
2637 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2638 return DT_UNKNOWN;
2639
2640 return ext4_filetype_table[filetype];
2641}
2642extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2643 void *buf, int buf_size);
2644
2645/* fsync.c */
2646extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2647
2648/* hash.c */
2649extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2650 struct dx_hash_info *hinfo);
2651
2652/* ialloc.c */
2653extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2654 const struct qstr *qstr, __u32 goal,
2655 uid_t *owner, __u32 i_flags,
2656 int handle_type, unsigned int line_no,
2657 int nblocks);
2658
2659#define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2660 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2661 i_flags, 0, 0, 0)
2662#define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2663 type, nblocks) \
2664 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2665 0, (type), __LINE__, (nblocks))
2666
2667
2668extern void ext4_free_inode(handle_t *, struct inode *);
2669extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2670extern unsigned long ext4_count_free_inodes(struct super_block *);
2671extern unsigned long ext4_count_dirs(struct super_block *);
2672extern void ext4_check_inodes_bitmap(struct super_block *);
2673extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2674extern int ext4_init_inode_table(struct super_block *sb,
2675 ext4_group_t group, int barrier);
2676extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2677
2678/* mballoc.c */
2679extern const struct seq_operations ext4_mb_seq_groups_ops;
2680extern long ext4_mb_stats;
2681extern long ext4_mb_max_to_scan;
2682extern int ext4_mb_init(struct super_block *);
2683extern int ext4_mb_release(struct super_block *);
2684extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2685 struct ext4_allocation_request *, int *);
2686extern int ext4_mb_reserve_blocks(struct super_block *, int);
2687extern void ext4_discard_preallocations(struct inode *, unsigned int);
2688extern int __init ext4_init_mballoc(void);
2689extern void ext4_exit_mballoc(void);
2690extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2691 ext4_group_t group,
2692 unsigned int nr, int *cnt);
2693extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2694 unsigned int nr);
2695
2696extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2697 struct buffer_head *bh, ext4_fsblk_t block,
2698 unsigned long count, int flags);
2699extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2700 ext4_group_t ngroups);
2701extern int ext4_mb_add_groupinfo(struct super_block *sb,
2702 ext4_group_t i, struct ext4_group_desc *desc);
2703extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2704 ext4_fsblk_t block, unsigned long count);
2705extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2706extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2707
2708/* inode.c */
2709int ext4_inode_is_fast_symlink(struct inode *inode);
2710struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2711struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2712int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2713 bool wait, struct buffer_head **bhs);
2714int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2715 struct buffer_head *bh_result, int create);
2716int ext4_get_block(struct inode *inode, sector_t iblock,
2717 struct buffer_head *bh_result, int create);
2718int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2719 struct buffer_head *bh, int create);
2720int ext4_walk_page_buffers(handle_t *handle,
2721 struct buffer_head *head,
2722 unsigned from,
2723 unsigned to,
2724 int *partial,
2725 int (*fn)(handle_t *handle,
2726 struct buffer_head *bh));
2727int do_journal_get_write_access(handle_t *handle,
2728 struct buffer_head *bh);
2729#define FALL_BACK_TO_NONDELALLOC 1
2730#define CONVERT_INLINE_DATA 2
2731
2732typedef enum {
2733 EXT4_IGET_NORMAL = 0,
2734 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */
2735 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */
2736} ext4_iget_flags;
2737
2738extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2739 ext4_iget_flags flags, const char *function,
2740 unsigned int line);
2741
2742#define ext4_iget(sb, ino, flags) \
2743 __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2744
2745extern int ext4_write_inode(struct inode *, struct writeback_control *);
2746extern int ext4_setattr(struct dentry *, struct iattr *);
2747extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2748extern void ext4_evict_inode(struct inode *);
2749extern void ext4_clear_inode(struct inode *);
2750extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2751extern int ext4_sync_inode(handle_t *, struct inode *);
2752extern void ext4_dirty_inode(struct inode *, int);
2753extern int ext4_change_inode_journal_flag(struct inode *, int);
2754extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2755extern int ext4_inode_attach_jinode(struct inode *inode);
2756extern int ext4_can_truncate(struct inode *inode);
2757extern int ext4_truncate(struct inode *);
2758extern int ext4_break_layouts(struct inode *);
2759extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2760extern void ext4_set_inode_flags(struct inode *, bool init);
2761extern int ext4_alloc_da_blocks(struct inode *inode);
2762extern void ext4_set_aops(struct inode *inode);
2763extern int ext4_writepage_trans_blocks(struct inode *);
2764extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2765extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2766 loff_t lstart, loff_t lend);
2767extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2768extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
2769extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2770extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2771extern void ext4_da_release_space(struct inode *inode, int to_free);
2772extern void ext4_da_update_reserve_space(struct inode *inode,
2773 int used, int quota_claim);
2774extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2775 ext4_fsblk_t pblk, ext4_lblk_t len);
2776
2777/* indirect.c */
2778extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2779 struct ext4_map_blocks *map, int flags);
2780extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2781extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2782extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2783 ext4_lblk_t start, ext4_lblk_t end);
2784
2785/* ioctl.c */
2786extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2787extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2788
2789/* migrate.c */
2790extern int ext4_ext_migrate(struct inode *);
2791extern int ext4_ind_migrate(struct inode *inode);
2792
2793/* namei.c */
2794extern int ext4_dirblock_csum_verify(struct inode *inode,
2795 struct buffer_head *bh);
2796extern int ext4_orphan_add(handle_t *, struct inode *);
2797extern int ext4_orphan_del(handle_t *, struct inode *);
2798extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2799 __u32 start_minor_hash, __u32 *next_hash);
2800extern int ext4_search_dir(struct buffer_head *bh,
2801 char *search_buf,
2802 int buf_size,
2803 struct inode *dir,
2804 struct ext4_filename *fname,
2805 unsigned int offset,
2806 struct ext4_dir_entry_2 **res_dir);
2807extern int ext4_generic_delete_entry(struct inode *dir,
2808 struct ext4_dir_entry_2 *de_del,
2809 struct buffer_head *bh,
2810 void *entry_buf,
2811 int buf_size,
2812 int csum_size);
2813extern bool ext4_empty_dir(struct inode *inode);
2814
2815/* resize.c */
2816extern void ext4_kvfree_array_rcu(void *to_free);
2817extern int ext4_group_add(struct super_block *sb,
2818 struct ext4_new_group_data *input);
2819extern int ext4_group_extend(struct super_block *sb,
2820 struct ext4_super_block *es,
2821 ext4_fsblk_t n_blocks_count);
2822extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2823
2824/* super.c */
2825extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2826 sector_t block, int op_flags);
2827extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2828extern int ext4_calculate_overhead(struct super_block *sb);
2829extern void ext4_superblock_csum_set(struct super_block *sb);
2830extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2831 ext4_group_t ngroup);
2832extern const char *ext4_decode_error(struct super_block *sb, int errno,
2833 char nbuf[16]);
2834extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2835 ext4_group_t block_group,
2836 unsigned int flags);
2837
2838extern __printf(6, 7)
2839void __ext4_error(struct super_block *, const char *, unsigned int, int, __u64,
2840 const char *, ...);
2841extern __printf(6, 7)
2842void __ext4_error_inode(struct inode *, const char *, unsigned int,
2843 ext4_fsblk_t, int, const char *, ...);
2844extern __printf(5, 6)
2845void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2846 const char *, ...);
2847extern void __ext4_std_error(struct super_block *, const char *,
2848 unsigned int, int);
2849extern __printf(5, 6)
2850void __ext4_abort(struct super_block *, const char *, unsigned int, int,
2851 const char *, ...);
2852extern __printf(4, 5)
2853void __ext4_warning(struct super_block *, const char *, unsigned int,
2854 const char *, ...);
2855extern __printf(4, 5)
2856void __ext4_warning_inode(const struct inode *inode, const char *function,
2857 unsigned int line, const char *fmt, ...);
2858extern __printf(3, 4)
2859void __ext4_msg(struct super_block *, const char *, const char *, ...);
2860extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2861 const char *, unsigned int, const char *);
2862extern __printf(7, 8)
2863void __ext4_grp_locked_error(const char *, unsigned int,
2864 struct super_block *, ext4_group_t,
2865 unsigned long, ext4_fsblk_t,
2866 const char *, ...);
2867
2868#define EXT4_ERROR_INODE(inode, fmt, a...) \
2869 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2870
2871#define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \
2872 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
2873
2874#define ext4_error_inode_block(inode, block, err, fmt, a...) \
2875 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
2876 (fmt), ## a)
2877
2878#define EXT4_ERROR_FILE(file, block, fmt, a...) \
2879 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2880
2881#ifdef CONFIG_PRINTK
2882
2883#define ext4_error_inode(inode, func, line, block, fmt, ...) \
2884 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
2885#define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
2886 __ext4_error_inode((inode), (func), (line), (block), \
2887 (err), (fmt), ##__VA_ARGS__)
2888#define ext4_error_file(file, func, line, block, fmt, ...) \
2889 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2890#define ext4_error(sb, fmt, ...) \
2891 __ext4_error((sb), __func__, __LINE__, 0, 0, (fmt), ##__VA_ARGS__)
2892#define ext4_error_err(sb, err, fmt, ...) \
2893 __ext4_error((sb), __func__, __LINE__, (err), 0, (fmt), ##__VA_ARGS__)
2894#define ext4_abort(sb, err, fmt, ...) \
2895 __ext4_abort((sb), __func__, __LINE__, (err), (fmt), ##__VA_ARGS__)
2896#define ext4_warning(sb, fmt, ...) \
2897 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2898#define ext4_warning_inode(inode, fmt, ...) \
2899 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2900#define ext4_msg(sb, level, fmt, ...) \
2901 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2902#define dump_mmp_msg(sb, mmp, msg) \
2903 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2904#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2905 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2906 fmt, ##__VA_ARGS__)
2907
2908#else
2909
2910#define ext4_error_inode(inode, func, line, block, fmt, ...) \
2911do { \
2912 no_printk(fmt, ##__VA_ARGS__); \
2913 __ext4_error_inode(inode, "", 0, block, 0, " "); \
2914} while (0)
2915#define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
2916do { \
2917 no_printk(fmt, ##__VA_ARGS__); \
2918 __ext4_error_inode(inode, "", 0, block, err, " "); \
2919} while (0)
2920#define ext4_error_file(file, func, line, block, fmt, ...) \
2921do { \
2922 no_printk(fmt, ##__VA_ARGS__); \
2923 __ext4_error_file(file, "", 0, block, " "); \
2924} while (0)
2925#define ext4_error(sb, fmt, ...) \
2926do { \
2927 no_printk(fmt, ##__VA_ARGS__); \
2928 __ext4_error(sb, "", 0, 0, 0, " "); \
2929} while (0)
2930#define ext4_error_err(sb, err, fmt, ...) \
2931do { \
2932 no_printk(fmt, ##__VA_ARGS__); \
2933 __ext4_error(sb, "", 0, err, 0, " "); \
2934} while (0)
2935#define ext4_abort(sb, err, fmt, ...) \
2936do { \
2937 no_printk(fmt, ##__VA_ARGS__); \
2938 __ext4_abort(sb, "", 0, err, " "); \
2939} while (0)
2940#define ext4_warning(sb, fmt, ...) \
2941do { \
2942 no_printk(fmt, ##__VA_ARGS__); \
2943 __ext4_warning(sb, "", 0, " "); \
2944} while (0)
2945#define ext4_warning_inode(inode, fmt, ...) \
2946do { \
2947 no_printk(fmt, ##__VA_ARGS__); \
2948 __ext4_warning_inode(inode, "", 0, " "); \
2949} while (0)
2950#define ext4_msg(sb, level, fmt, ...) \
2951do { \
2952 no_printk(fmt, ##__VA_ARGS__); \
2953 __ext4_msg(sb, "", " "); \
2954} while (0)
2955#define dump_mmp_msg(sb, mmp, msg) \
2956 __dump_mmp_msg(sb, mmp, "", 0, "")
2957#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2958do { \
2959 no_printk(fmt, ##__VA_ARGS__); \
2960 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
2961} while (0)
2962
2963#endif
2964
2965extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2966 struct ext4_group_desc *bg);
2967extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2968 struct ext4_group_desc *bg);
2969extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2970 struct ext4_group_desc *bg);
2971extern __u32 ext4_free_group_clusters(struct super_block *sb,
2972 struct ext4_group_desc *bg);
2973extern __u32 ext4_free_inodes_count(struct super_block *sb,
2974 struct ext4_group_desc *bg);
2975extern __u32 ext4_used_dirs_count(struct super_block *sb,
2976 struct ext4_group_desc *bg);
2977extern __u32 ext4_itable_unused_count(struct super_block *sb,
2978 struct ext4_group_desc *bg);
2979extern void ext4_block_bitmap_set(struct super_block *sb,
2980 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2981extern void ext4_inode_bitmap_set(struct super_block *sb,
2982 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2983extern void ext4_inode_table_set(struct super_block *sb,
2984 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2985extern void ext4_free_group_clusters_set(struct super_block *sb,
2986 struct ext4_group_desc *bg,
2987 __u32 count);
2988extern void ext4_free_inodes_set(struct super_block *sb,
2989 struct ext4_group_desc *bg, __u32 count);
2990extern void ext4_used_dirs_set(struct super_block *sb,
2991 struct ext4_group_desc *bg, __u32 count);
2992extern void ext4_itable_unused_set(struct super_block *sb,
2993 struct ext4_group_desc *bg, __u32 count);
2994extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2995 struct ext4_group_desc *gdp);
2996extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2997 struct ext4_group_desc *gdp);
2998extern int ext4_register_li_request(struct super_block *sb,
2999 ext4_group_t first_not_zeroed);
3000
3001static inline int ext4_has_metadata_csum(struct super_block *sb)
3002{
3003 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3004 !EXT4_SB(sb)->s_chksum_driver);
3005
3006 return ext4_has_feature_metadata_csum(sb) &&
3007 (EXT4_SB(sb)->s_chksum_driver != NULL);
3008}
3009
3010static inline int ext4_has_group_desc_csum(struct super_block *sb)
3011{
3012 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3013}
3014
3015static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3016{
3017 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
3018 le32_to_cpu(es->s_blocks_count_lo);
3019}
3020
3021static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3022{
3023 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
3024 le32_to_cpu(es->s_r_blocks_count_lo);
3025}
3026
3027static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3028{
3029 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
3030 le32_to_cpu(es->s_free_blocks_count_lo);
3031}
3032
3033static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3034 ext4_fsblk_t blk)
3035{
3036 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3037 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3038}
3039
3040static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3041 ext4_fsblk_t blk)
3042{
3043 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3044 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3045}
3046
3047static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3048 ext4_fsblk_t blk)
3049{
3050 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3051 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3052}
3053
3054static inline loff_t ext4_isize(struct super_block *sb,
3055 struct ext4_inode *raw_inode)
3056{
3057 if (ext4_has_feature_largedir(sb) ||
3058 S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3059 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3060 le32_to_cpu(raw_inode->i_size_lo);
3061
3062 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3063}
3064
3065static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3066{
3067 raw_inode->i_size_lo = cpu_to_le32(i_size);
3068 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3069}
3070
3071static inline
3072struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
3073 ext4_group_t group)
3074{
3075 struct ext4_group_info **grp_info;
3076 long indexv, indexh;
3077 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
3078 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
3079 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
3080 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
3081 return grp_info[indexh];
3082}
3083
3084/*
3085 * Reading s_groups_count requires using smp_rmb() afterwards. See
3086 * the locking protocol documented in the comments of ext4_group_add()
3087 * in resize.c
3088 */
3089static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3090{
3091 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3092
3093 smp_rmb();
3094 return ngroups;
3095}
3096
3097static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3098 ext4_group_t block_group)
3099{
3100 return block_group >> sbi->s_log_groups_per_flex;
3101}
3102
3103static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3104{
3105 return 1 << sbi->s_log_groups_per_flex;
3106}
3107
3108#define ext4_std_error(sb, errno) \
3109do { \
3110 if ((errno)) \
3111 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
3112} while (0)
3113
3114#ifdef CONFIG_SMP
3115/* Each CPU can accumulate percpu_counter_batch clusters in their local
3116 * counters. So we need to make sure we have free clusters more
3117 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
3118 */
3119#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3120#else
3121#define EXT4_FREECLUSTERS_WATERMARK 0
3122#endif
3123
3124/* Update i_disksize. Requires i_mutex to avoid races with truncate */
3125static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3126{
3127 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3128 !inode_is_locked(inode));
3129 down_write(&EXT4_I(inode)->i_data_sem);
3130 if (newsize > EXT4_I(inode)->i_disksize)
3131 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3132 up_write(&EXT4_I(inode)->i_data_sem);
3133}
3134
3135/* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
3136static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3137{
3138 int changed = 0;
3139
3140 if (newsize > inode->i_size) {
3141 i_size_write(inode, newsize);
3142 changed = 1;
3143 }
3144 if (newsize > EXT4_I(inode)->i_disksize) {
3145 ext4_update_i_disksize(inode, newsize);
3146 changed |= 2;
3147 }
3148 return changed;
3149}
3150
3151int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3152 loff_t len);
3153
3154struct ext4_group_info {
3155 unsigned long bb_state;
3156 struct rb_root bb_free_root;
3157 ext4_grpblk_t bb_first_free; /* first free block */
3158 ext4_grpblk_t bb_free; /* total free blocks */
3159 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
3160 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
3161 struct list_head bb_prealloc_list;
3162#ifdef DOUBLE_CHECK
3163 void *bb_bitmap;
3164#endif
3165 struct rw_semaphore alloc_sem;
3166 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
3167 * regions, index is order.
3168 * bb_counters[3] = 5 means
3169 * 5 free 8-block regions. */
3170};
3171
3172#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
3173#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
3174#define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
3175#define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
3176#define EXT4_GROUP_INFO_BBITMAP_CORRUPT \
3177 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3178#define EXT4_GROUP_INFO_IBITMAP_CORRUPT \
3179 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3180#define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4
3181
3182#define EXT4_MB_GRP_NEED_INIT(grp) \
3183 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3184#define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
3185 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3186#define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
3187 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3188
3189#define EXT4_MB_GRP_WAS_TRIMMED(grp) \
3190 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3191#define EXT4_MB_GRP_SET_TRIMMED(grp) \
3192 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3193#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
3194 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3195#define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \
3196 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3197
3198#define EXT4_MAX_CONTENTION 8
3199#define EXT4_CONTENTION_THRESHOLD 2
3200
3201static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3202 ext4_group_t group)
3203{
3204 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3205}
3206
3207/*
3208 * Returns true if the filesystem is busy enough that attempts to
3209 * access the block group locks has run into contention.
3210 */
3211static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3212{
3213 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3214}
3215
3216static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3217{
3218 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3219 if (spin_trylock(lock))
3220 /*
3221 * We're able to grab the lock right away, so drop the
3222 * lock contention counter.
3223 */
3224 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3225 else {
3226 /*
3227 * The lock is busy, so bump the contention counter,
3228 * and then wait on the spin lock.
3229 */
3230 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3231 EXT4_MAX_CONTENTION);
3232 spin_lock(lock);
3233 }
3234}
3235
3236static inline void ext4_unlock_group(struct super_block *sb,
3237 ext4_group_t group)
3238{
3239 spin_unlock(ext4_group_lock_ptr(sb, group));
3240}
3241
3242/*
3243 * Block validity checking
3244 */
3245#define ext4_check_indirect_blockref(inode, bh) \
3246 ext4_check_blockref(__func__, __LINE__, inode, \
3247 (__le32 *)(bh)->b_data, \
3248 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3249
3250#define ext4_ind_check_inode(inode) \
3251 ext4_check_blockref(__func__, __LINE__, inode, \
3252 EXT4_I(inode)->i_data, \
3253 EXT4_NDIR_BLOCKS)
3254
3255/*
3256 * Inodes and files operations
3257 */
3258
3259/* dir.c */
3260extern const struct file_operations ext4_dir_operations;
3261
3262#ifdef CONFIG_UNICODE
3263extern const struct dentry_operations ext4_dentry_ops;
3264#endif
3265
3266/* file.c */
3267extern const struct inode_operations ext4_file_inode_operations;
3268extern const struct file_operations ext4_file_operations;
3269extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3270
3271/* inline.c */
3272extern int ext4_get_max_inline_size(struct inode *inode);
3273extern int ext4_find_inline_data_nolock(struct inode *inode);
3274extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3275 unsigned int len);
3276extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3277
3278extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3279extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3280 struct inode *inode,
3281 loff_t pos, unsigned len,
3282 unsigned flags,
3283 struct page **pagep);
3284extern int ext4_write_inline_data_end(struct inode *inode,
3285 loff_t pos, unsigned len,
3286 unsigned copied,
3287 struct page *page);
3288extern struct buffer_head *
3289ext4_journalled_write_inline_data(struct inode *inode,
3290 unsigned len,
3291 struct page *page);
3292extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3293 struct inode *inode,
3294 loff_t pos, unsigned len,
3295 unsigned flags,
3296 struct page **pagep,
3297 void **fsdata);
3298extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3299 unsigned len, unsigned copied,
3300 struct page *page);
3301extern int ext4_try_add_inline_entry(handle_t *handle,
3302 struct ext4_filename *fname,
3303 struct inode *dir, struct inode *inode);
3304extern int ext4_try_create_inline_dir(handle_t *handle,
3305 struct inode *parent,
3306 struct inode *inode);
3307extern int ext4_read_inline_dir(struct file *filp,
3308 struct dir_context *ctx,
3309 int *has_inline_data);
3310extern int ext4_inlinedir_to_tree(struct file *dir_file,
3311 struct inode *dir, ext4_lblk_t block,
3312 struct dx_hash_info *hinfo,
3313 __u32 start_hash, __u32 start_minor_hash,
3314 int *has_inline_data);
3315extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3316 struct ext4_filename *fname,
3317 struct ext4_dir_entry_2 **res_dir,
3318 int *has_inline_data);
3319extern int ext4_delete_inline_entry(handle_t *handle,
3320 struct inode *dir,
3321 struct ext4_dir_entry_2 *de_del,
3322 struct buffer_head *bh,
3323 int *has_inline_data);
3324extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3325extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3326 struct ext4_dir_entry_2 **parent_de,
3327 int *retval);
3328extern int ext4_inline_data_fiemap(struct inode *inode,
3329 struct fiemap_extent_info *fieinfo,
3330 int *has_inline, __u64 start, __u64 len);
3331
3332struct iomap;
3333extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3334
3335extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3336
3337extern int ext4_convert_inline_data(struct inode *inode);
3338
3339static inline int ext4_has_inline_data(struct inode *inode)
3340{
3341 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3342 EXT4_I(inode)->i_inline_off;
3343}
3344
3345/* namei.c */
3346extern const struct inode_operations ext4_dir_inode_operations;
3347extern const struct inode_operations ext4_special_inode_operations;
3348extern struct dentry *ext4_get_parent(struct dentry *child);
3349extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3350 struct ext4_dir_entry_2 *de,
3351 int blocksize, int csum_size,
3352 unsigned int parent_ino, int dotdot_real_len);
3353extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3354 unsigned int blocksize);
3355extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3356 struct buffer_head *bh);
3357extern int ext4_ci_compare(const struct inode *parent,
3358 const struct qstr *fname,
3359 const struct qstr *entry, bool quick);
3360
3361#define S_SHIFT 12
3362static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3363 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
3364 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
3365 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
3366 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
3367 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
3368 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
3369 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
3370};
3371
3372static inline void ext4_set_de_type(struct super_block *sb,
3373 struct ext4_dir_entry_2 *de,
3374 umode_t mode) {
3375 if (ext4_has_feature_filetype(sb))
3376 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3377}
3378
3379/* readpages.c */
3380extern int ext4_mpage_readpages(struct inode *inode,
3381 struct readahead_control *rac, struct page *page);
3382extern int __init ext4_init_post_read_processing(void);
3383extern void ext4_exit_post_read_processing(void);
3384
3385/* symlink.c */
3386extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3387extern const struct inode_operations ext4_symlink_inode_operations;
3388extern const struct inode_operations ext4_fast_symlink_inode_operations;
3389
3390/* sysfs.c */
3391extern int ext4_register_sysfs(struct super_block *sb);
3392extern void ext4_unregister_sysfs(struct super_block *sb);
3393extern int __init ext4_init_sysfs(void);
3394extern void ext4_exit_sysfs(void);
3395
3396/* block_validity */
3397extern void ext4_release_system_zone(struct super_block *sb);
3398extern int ext4_setup_system_zone(struct super_block *sb);
3399extern int __init ext4_init_system_zone(void);
3400extern void ext4_exit_system_zone(void);
3401extern int ext4_inode_block_valid(struct inode *inode,
3402 ext4_fsblk_t start_blk,
3403 unsigned int count);
3404extern int ext4_check_blockref(const char *, unsigned int,
3405 struct inode *, __le32 *, unsigned int);
3406
3407/* extents.c */
3408struct ext4_ext_path;
3409struct ext4_extent;
3410
3411/*
3412 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3413 * __le32.
3414 */
3415#define EXT_MAX_BLOCKS 0xffffffff
3416
3417extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3418extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3419extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3420 struct ext4_map_blocks *map, int flags);
3421extern int ext4_ext_truncate(handle_t *, struct inode *);
3422extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3423 ext4_lblk_t end);
3424extern void ext4_ext_init(struct super_block *);
3425extern void ext4_ext_release(struct super_block *);
3426extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3427 loff_t len);
3428extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3429 loff_t offset, ssize_t len);
3430extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3431 ext4_io_end_t *io_end);
3432extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3433 struct ext4_map_blocks *map, int flags);
3434extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3435 int num,
3436 struct ext4_ext_path *path);
3437extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3438 struct ext4_ext_path **,
3439 struct ext4_extent *, int);
3440extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3441 struct ext4_ext_path **,
3442 int flags);
3443extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3444extern int ext4_ext_check_inode(struct inode *inode);
3445extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3446extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3447 __u64 start, __u64 len);
3448extern int ext4_get_es_cache(struct inode *inode,
3449 struct fiemap_extent_info *fieinfo,
3450 __u64 start, __u64 len);
3451extern int ext4_ext_precache(struct inode *inode);
3452extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3453 struct inode *inode2, ext4_lblk_t lblk1,
3454 ext4_lblk_t lblk2, ext4_lblk_t count,
3455 int mark_unwritten,int *err);
3456extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3457extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3458 int check_cred, int restart_cred,
3459 int revoke_cred);
3460
3461
3462/* move_extent.c */
3463extern void ext4_double_down_write_data_sem(struct inode *first,
3464 struct inode *second);
3465extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3466 struct inode *donor_inode);
3467extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3468 __u64 start_orig, __u64 start_donor,
3469 __u64 len, __u64 *moved_len);
3470
3471/* page-io.c */
3472extern int __init ext4_init_pageio(void);
3473extern void ext4_exit_pageio(void);
3474extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3475extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3476extern int ext4_put_io_end(ext4_io_end_t *io_end);
3477extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3478extern void ext4_io_submit_init(struct ext4_io_submit *io,
3479 struct writeback_control *wbc);
3480extern void ext4_end_io_rsv_work(struct work_struct *work);
3481extern void ext4_io_submit(struct ext4_io_submit *io);
3482extern int ext4_bio_write_page(struct ext4_io_submit *io,
3483 struct page *page,
3484 int len,
3485 struct writeback_control *wbc,
3486 bool keep_towrite);
3487extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3488extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3489
3490/* mmp.c */
3491extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3492
3493/* verity.c */
3494extern const struct fsverity_operations ext4_verityops;
3495
3496/*
3497 * Add new method to test whether block and inode bitmaps are properly
3498 * initialized. With uninit_bg reading the block from disk is not enough
3499 * to mark the bitmap uptodate. We need to also zero-out the bitmap
3500 */
3501#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3502
3503static inline int bitmap_uptodate(struct buffer_head *bh)
3504{
3505 return (buffer_uptodate(bh) &&
3506 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3507}
3508static inline void set_bitmap_uptodate(struct buffer_head *bh)
3509{
3510 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3511}
3512
3513#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3514
3515/* For ioend & aio unwritten conversion wait queues */
3516#define EXT4_WQ_HASH_SZ 37
3517#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
3518 EXT4_WQ_HASH_SZ])
3519extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3520
3521extern int ext4_resize_begin(struct super_block *sb);
3522extern void ext4_resize_end(struct super_block *sb);
3523
3524static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3525 struct ext4_io_end *io_end)
3526{
3527 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3528 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3529 atomic_inc(&EXT4_I(inode)->i_unwritten);
3530 }
3531}
3532
3533static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3534{
3535 struct inode *inode = io_end->inode;
3536
3537 if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3538 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3539 /* Wake up anyone waiting on unwritten extent conversion */
3540 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3541 wake_up_all(ext4_ioend_wq(inode));
3542 }
3543}
3544
3545extern const struct iomap_ops ext4_iomap_ops;
3546extern const struct iomap_ops ext4_iomap_overwrite_ops;
3547extern const struct iomap_ops ext4_iomap_report_ops;
3548
3549static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3550{
3551 /*
3552 * If the buffer has the write error flag, we have failed
3553 * to write out data in the block. In this case, we don't
3554 * have to read the block because we may read the old data
3555 * successfully.
3556 */
3557 if (!buffer_uptodate(bh) && buffer_write_io_error(bh))
3558 set_buffer_uptodate(bh);
3559 return buffer_uptodate(bh);
3560}
3561
3562#endif /* __KERNEL__ */
3563
3564#define EFSBADCRC EBADMSG /* Bad CRC detected */
3565#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
3566
3567#endif /* _EXT4_H */