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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/*
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 <linux/ratelimit.h>
33#include <crypto/hash.h>
34#include <linux/falloc.h>
35#ifdef __KERNEL__
36#include <linux/compat.h>
37#endif
38
39/*
40 * The fourth extended filesystem constants/structures
41 */
42
43/*
44 * Define EXT4FS_DEBUG to produce debug messages
45 */
46#undef EXT4FS_DEBUG
47
48/*
49 * Debug code
50 */
51#ifdef EXT4FS_DEBUG
52#define ext4_debug(f, a...) \
53 do { \
54 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
55 __FILE__, __LINE__, __func__); \
56 printk(KERN_DEBUG f, ## a); \
57 } while (0)
58#else
59#define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
60#endif
61
62/*
63 * Turn on EXT_DEBUG to get lots of info about extents operations.
64 */
65#define EXT_DEBUG__
66#ifdef EXT_DEBUG
67#define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
68#else
69#define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
70#endif
71
72#define EXT4_ERROR_INODE(inode, fmt, a...) \
73 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
74
75#define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
76 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
77
78#define EXT4_ERROR_FILE(file, block, fmt, a...) \
79 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
80
81/* data type for block offset of block group */
82typedef int ext4_grpblk_t;
83
84/* data type for filesystem-wide blocks number */
85typedef unsigned long long ext4_fsblk_t;
86
87/* data type for file logical block number */
88typedef __u32 ext4_lblk_t;
89
90/* data type for block group number */
91typedef unsigned int ext4_group_t;
92
93/*
94 * Flags used in mballoc's allocation_context flags field.
95 *
96 * Also used to show what's going on for debugging purposes when the
97 * flag field is exported via the traceport interface
98 */
99
100/* prefer goal again. length */
101#define EXT4_MB_HINT_MERGE 0x0001
102/* blocks already reserved */
103#define EXT4_MB_HINT_RESERVED 0x0002
104/* metadata is being allocated */
105#define EXT4_MB_HINT_METADATA 0x0004
106/* first blocks in the file */
107#define EXT4_MB_HINT_FIRST 0x0008
108/* search for the best chunk */
109#define EXT4_MB_HINT_BEST 0x0010
110/* data is being allocated */
111#define EXT4_MB_HINT_DATA 0x0020
112/* don't preallocate (for tails) */
113#define EXT4_MB_HINT_NOPREALLOC 0x0040
114/* allocate for locality group */
115#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
116/* allocate goal blocks or none */
117#define EXT4_MB_HINT_GOAL_ONLY 0x0100
118/* goal is meaningful */
119#define EXT4_MB_HINT_TRY_GOAL 0x0200
120/* blocks already pre-reserved by delayed allocation */
121#define EXT4_MB_DELALLOC_RESERVED 0x0400
122/* We are doing stream allocation */
123#define EXT4_MB_STREAM_ALLOC 0x0800
124/* Use reserved root blocks if needed */
125#define EXT4_MB_USE_ROOT_BLOCKS 0x1000
126/* Use blocks from reserved pool */
127#define EXT4_MB_USE_RESERVED 0x2000
128
129struct ext4_allocation_request {
130 /* target inode for block we're allocating */
131 struct inode *inode;
132 /* how many blocks we want to allocate */
133 unsigned int len;
134 /* logical block in target inode */
135 ext4_lblk_t logical;
136 /* the closest logical allocated block to the left */
137 ext4_lblk_t lleft;
138 /* the closest logical allocated block to the right */
139 ext4_lblk_t lright;
140 /* phys. target (a hint) */
141 ext4_fsblk_t goal;
142 /* phys. block for the closest logical allocated block to the left */
143 ext4_fsblk_t pleft;
144 /* phys. block for the closest logical allocated block to the right */
145 ext4_fsblk_t pright;
146 /* flags. see above EXT4_MB_HINT_* */
147 unsigned int flags;
148};
149
150/*
151 * Logical to physical block mapping, used by ext4_map_blocks()
152 *
153 * This structure is used to pass requests into ext4_map_blocks() as
154 * well as to store the information returned by ext4_map_blocks(). It
155 * takes less room on the stack than a struct buffer_head.
156 */
157#define EXT4_MAP_NEW (1 << BH_New)
158#define EXT4_MAP_MAPPED (1 << BH_Mapped)
159#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
160#define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
161#define EXT4_MAP_UNINIT (1 << BH_Uninit)
162/* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
163 * ext4_map_blocks wants to know whether or not the underlying cluster has
164 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
165 * the requested mapping was from previously mapped (or delayed allocated)
166 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
167 * should never appear on buffer_head's state flags.
168 */
169#define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster)
170#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
171 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
172 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER)
173
174struct ext4_map_blocks {
175 ext4_fsblk_t m_pblk;
176 ext4_lblk_t m_lblk;
177 unsigned int m_len;
178 unsigned int m_flags;
179};
180
181/*
182 * Flags for ext4_io_end->flags
183 */
184#define EXT4_IO_END_UNWRITTEN 0x0001
185
186/*
187 * For converting uninitialized extents on a work queue. 'handle' is used for
188 * buffered writeback.
189 */
190typedef struct ext4_io_end {
191 struct list_head list; /* per-file finished IO list */
192 handle_t *handle; /* handle reserved for extent
193 * conversion */
194 struct inode *inode; /* file being written to */
195 struct bio *bio; /* Linked list of completed
196 * bios covering the extent */
197 unsigned int flag; /* unwritten or not */
198 loff_t offset; /* offset in the file */
199 ssize_t size; /* size of the extent */
200 atomic_t count; /* reference counter */
201} ext4_io_end_t;
202
203struct ext4_io_submit {
204 int io_op;
205 struct bio *io_bio;
206 ext4_io_end_t *io_end;
207 sector_t io_next_block;
208};
209
210/*
211 * Special inodes numbers
212 */
213#define EXT4_BAD_INO 1 /* Bad blocks inode */
214#define EXT4_ROOT_INO 2 /* Root inode */
215#define EXT4_USR_QUOTA_INO 3 /* User quota inode */
216#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
217#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
218#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
219#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
220#define EXT4_JOURNAL_INO 8 /* Journal inode */
221
222/* First non-reserved inode for old ext4 filesystems */
223#define EXT4_GOOD_OLD_FIRST_INO 11
224
225/*
226 * Maximal count of links to a file
227 */
228#define EXT4_LINK_MAX 65000
229
230/*
231 * Macro-instructions used to manage several block sizes
232 */
233#define EXT4_MIN_BLOCK_SIZE 1024
234#define EXT4_MAX_BLOCK_SIZE 65536
235#define EXT4_MIN_BLOCK_LOG_SIZE 10
236#define EXT4_MAX_BLOCK_LOG_SIZE 16
237#ifdef __KERNEL__
238# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
239#else
240# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
241#endif
242#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
243#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
244 EXT4_SB(s)->s_cluster_bits)
245#ifdef __KERNEL__
246# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
247# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
248#else
249# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
250#endif
251#ifdef __KERNEL__
252#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
253#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
254#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
255#else
256#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
257 EXT4_GOOD_OLD_INODE_SIZE : \
258 (s)->s_inode_size)
259#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
260 EXT4_GOOD_OLD_FIRST_INO : \
261 (s)->s_first_ino)
262#endif
263#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
264
265/* Translate a block number to a cluster number */
266#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
267/* Translate a cluster number to a block number */
268#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
269/* Translate # of blks to # of clusters */
270#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
271 (sbi)->s_cluster_bits)
272/* Mask out the low bits to get the starting block of the cluster */
273#define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
274 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
275#define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
276 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
277/* Get the cluster offset */
278#define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
279 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
280#define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
281 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
282
283/*
284 * Structure of a blocks group descriptor
285 */
286struct ext4_group_desc
287{
288 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
289 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
290 __le32 bg_inode_table_lo; /* Inodes table block */
291 __le16 bg_free_blocks_count_lo;/* Free blocks count */
292 __le16 bg_free_inodes_count_lo;/* Free inodes count */
293 __le16 bg_used_dirs_count_lo; /* Directories count */
294 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
295 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
296 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
297 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
298 __le16 bg_itable_unused_lo; /* Unused inodes count */
299 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
300 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
301 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
302 __le32 bg_inode_table_hi; /* Inodes table block MSB */
303 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
304 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
305 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
306 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
307 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
308 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
309 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
310 __u32 bg_reserved;
311};
312
313#define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
314 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
315 sizeof(__le16))
316#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
317 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
318 sizeof(__le16))
319
320/*
321 * Structure of a flex block group info
322 */
323
324struct flex_groups {
325 atomic64_t free_clusters;
326 atomic_t free_inodes;
327 atomic_t used_dirs;
328};
329
330#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
331#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
332#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
333
334/*
335 * Macro-instructions used to manage group descriptors
336 */
337#define EXT4_MIN_DESC_SIZE 32
338#define EXT4_MIN_DESC_SIZE_64BIT 64
339#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
340#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
341#ifdef __KERNEL__
342# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
343# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
344# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
345# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
346# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
347#else
348# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
349# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
350# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
351#endif
352
353/*
354 * Constants relative to the data blocks
355 */
356#define EXT4_NDIR_BLOCKS 12
357#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
358#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
359#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
360#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
361
362/*
363 * Inode flags
364 */
365#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
366#define EXT4_UNRM_FL 0x00000002 /* Undelete */
367#define EXT4_COMPR_FL 0x00000004 /* Compress file */
368#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
369#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
370#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
371#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
372#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
373/* Reserved for compression usage... */
374#define EXT4_DIRTY_FL 0x00000100
375#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
376#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
377#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
378/* End compression flags --- maybe not all used */
379#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
380#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
381#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
382#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
383#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
384#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
385#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
386#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
387#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
388#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
389#define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
390#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
391
392#define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
393#define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */
394
395/* Flags that should be inherited by new inodes from their parent. */
396#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
397 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
398 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
399 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
400
401/* Flags that are appropriate for regular files (all but dir-specific ones). */
402#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
403
404/* Flags that are appropriate for non-directories/regular files. */
405#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
406
407/* Mask out flags that are inappropriate for the given type of inode. */
408static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
409{
410 if (S_ISDIR(mode))
411 return flags;
412 else if (S_ISREG(mode))
413 return flags & EXT4_REG_FLMASK;
414 else
415 return flags & EXT4_OTHER_FLMASK;
416}
417
418/*
419 * Inode flags used for atomic set/get
420 */
421enum {
422 EXT4_INODE_SECRM = 0, /* Secure deletion */
423 EXT4_INODE_UNRM = 1, /* Undelete */
424 EXT4_INODE_COMPR = 2, /* Compress file */
425 EXT4_INODE_SYNC = 3, /* Synchronous updates */
426 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
427 EXT4_INODE_APPEND = 5, /* writes to file may only append */
428 EXT4_INODE_NODUMP = 6, /* do not dump file */
429 EXT4_INODE_NOATIME = 7, /* do not update atime */
430/* Reserved for compression usage... */
431 EXT4_INODE_DIRTY = 8,
432 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
433 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
434 EXT4_INODE_ECOMPR = 11, /* Compression error */
435/* End compression flags --- maybe not all used */
436 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
437 EXT4_INODE_IMAGIC = 13, /* AFS directory */
438 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
439 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
440 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
441 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
442 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
443 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
444 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
445 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
446 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
447 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
448};
449
450/*
451 * Since it's pretty easy to mix up bit numbers and hex values, we use a
452 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
453 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
454 * any extra space in the compiled kernel image, otherwise, the build will fail.
455 * It's important that these values are the same, since we are using
456 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
457 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
458 * values found in ext2, ext3 and ext4 filesystems, and of course the values
459 * defined in e2fsprogs.
460 *
461 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
462 */
463#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
464#define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
465
466static inline void ext4_check_flag_values(void)
467{
468 CHECK_FLAG_VALUE(SECRM);
469 CHECK_FLAG_VALUE(UNRM);
470 CHECK_FLAG_VALUE(COMPR);
471 CHECK_FLAG_VALUE(SYNC);
472 CHECK_FLAG_VALUE(IMMUTABLE);
473 CHECK_FLAG_VALUE(APPEND);
474 CHECK_FLAG_VALUE(NODUMP);
475 CHECK_FLAG_VALUE(NOATIME);
476 CHECK_FLAG_VALUE(DIRTY);
477 CHECK_FLAG_VALUE(COMPRBLK);
478 CHECK_FLAG_VALUE(NOCOMPR);
479 CHECK_FLAG_VALUE(ECOMPR);
480 CHECK_FLAG_VALUE(INDEX);
481 CHECK_FLAG_VALUE(IMAGIC);
482 CHECK_FLAG_VALUE(JOURNAL_DATA);
483 CHECK_FLAG_VALUE(NOTAIL);
484 CHECK_FLAG_VALUE(DIRSYNC);
485 CHECK_FLAG_VALUE(TOPDIR);
486 CHECK_FLAG_VALUE(HUGE_FILE);
487 CHECK_FLAG_VALUE(EXTENTS);
488 CHECK_FLAG_VALUE(EA_INODE);
489 CHECK_FLAG_VALUE(EOFBLOCKS);
490 CHECK_FLAG_VALUE(INLINE_DATA);
491 CHECK_FLAG_VALUE(RESERVED);
492}
493
494/* Used to pass group descriptor data when online resize is done */
495struct ext4_new_group_input {
496 __u32 group; /* Group number for this data */
497 __u64 block_bitmap; /* Absolute block number of block bitmap */
498 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
499 __u64 inode_table; /* Absolute block number of inode table start */
500 __u32 blocks_count; /* Total number of blocks in this group */
501 __u16 reserved_blocks; /* Number of reserved blocks in this group */
502 __u16 unused;
503};
504
505#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
506struct compat_ext4_new_group_input {
507 u32 group;
508 compat_u64 block_bitmap;
509 compat_u64 inode_bitmap;
510 compat_u64 inode_table;
511 u32 blocks_count;
512 u16 reserved_blocks;
513 u16 unused;
514};
515#endif
516
517/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
518struct ext4_new_group_data {
519 __u32 group;
520 __u64 block_bitmap;
521 __u64 inode_bitmap;
522 __u64 inode_table;
523 __u32 blocks_count;
524 __u16 reserved_blocks;
525 __u16 unused;
526 __u32 free_blocks_count;
527};
528
529/* Indexes used to index group tables in ext4_new_group_data */
530enum {
531 BLOCK_BITMAP = 0, /* block bitmap */
532 INODE_BITMAP, /* inode bitmap */
533 INODE_TABLE, /* inode tables */
534 GROUP_TABLE_COUNT,
535};
536
537/*
538 * Flags used by ext4_map_blocks()
539 */
540 /* Allocate any needed blocks and/or convert an unitialized
541 extent to be an initialized ext4 */
542#define EXT4_GET_BLOCKS_CREATE 0x0001
543 /* Request the creation of an unitialized extent */
544#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
545#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
546 EXT4_GET_BLOCKS_CREATE)
547 /* Caller is from the delayed allocation writeout path
548 * finally doing the actual allocation of delayed blocks */
549#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
550 /* caller is from the direct IO path, request to creation of an
551 unitialized extents if not allocated, split the uninitialized
552 extent if blocks has been preallocated already*/
553#define EXT4_GET_BLOCKS_PRE_IO 0x0008
554#define EXT4_GET_BLOCKS_CONVERT 0x0010
555#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
556 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
557 /* Convert extent to initialized after IO complete */
558#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
559 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
560 /* Eventual metadata allocation (due to growing extent tree)
561 * should not fail, so try to use reserved blocks for that.*/
562#define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
563 /* Don't normalize allocation size (used for fallocate) */
564#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
565 /* Request will not result in inode size update (user for fallocate) */
566#define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
567 /* Do not take i_data_sem locking in ext4_map_blocks */
568#define EXT4_GET_BLOCKS_NO_LOCK 0x0100
569 /* Do not put hole in extent cache */
570#define EXT4_GET_BLOCKS_NO_PUT_HOLE 0x0200
571 /* Convert written extents to unwritten */
572#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0400
573
574/*
575 * The bit position of these flags must not overlap with any of the
576 * EXT4_GET_BLOCKS_*. They are used by ext4_ext_find_extent(),
577 * read_extent_tree_block(), ext4_split_extent_at(),
578 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
579 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
580 * caching the extents when reading from the extent tree while a
581 * truncate or punch hole operation is in progress.
582 */
583#define EXT4_EX_NOCACHE 0x0400
584#define EXT4_EX_FORCE_CACHE 0x0800
585
586/*
587 * Flags used by ext4_free_blocks
588 */
589#define EXT4_FREE_BLOCKS_METADATA 0x0001
590#define EXT4_FREE_BLOCKS_FORGET 0x0002
591#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
592#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
593#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
594#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
595#define EXT4_FREE_BLOCKS_RESERVE 0x0040
596
597/*
598 * ioctl commands
599 */
600#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
601#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
602#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
603#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
604#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
605#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
606#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
607#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
608#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
609#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
610#define EXT4_IOC_MIGRATE _IO('f', 9)
611 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
612 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
613#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
614#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
615#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
616#define EXT4_IOC_SWAP_BOOT _IO('f', 17)
617#define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
618
619#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
620/*
621 * ioctl commands in 32 bit emulation
622 */
623#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
624#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
625#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
626#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
627#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
628#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
629#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
630#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
631#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
632#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
633#endif
634
635/* Max physical block we can address w/o extents */
636#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
637
638/*
639 * Structure of an inode on the disk
640 */
641struct ext4_inode {
642 __le16 i_mode; /* File mode */
643 __le16 i_uid; /* Low 16 bits of Owner Uid */
644 __le32 i_size_lo; /* Size in bytes */
645 __le32 i_atime; /* Access time */
646 __le32 i_ctime; /* Inode Change time */
647 __le32 i_mtime; /* Modification time */
648 __le32 i_dtime; /* Deletion Time */
649 __le16 i_gid; /* Low 16 bits of Group Id */
650 __le16 i_links_count; /* Links count */
651 __le32 i_blocks_lo; /* Blocks count */
652 __le32 i_flags; /* File flags */
653 union {
654 struct {
655 __le32 l_i_version;
656 } linux1;
657 struct {
658 __u32 h_i_translator;
659 } hurd1;
660 struct {
661 __u32 m_i_reserved1;
662 } masix1;
663 } osd1; /* OS dependent 1 */
664 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
665 __le32 i_generation; /* File version (for NFS) */
666 __le32 i_file_acl_lo; /* File ACL */
667 __le32 i_size_high;
668 __le32 i_obso_faddr; /* Obsoleted fragment address */
669 union {
670 struct {
671 __le16 l_i_blocks_high; /* were l_i_reserved1 */
672 __le16 l_i_file_acl_high;
673 __le16 l_i_uid_high; /* these 2 fields */
674 __le16 l_i_gid_high; /* were reserved2[0] */
675 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
676 __le16 l_i_reserved;
677 } linux2;
678 struct {
679 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
680 __u16 h_i_mode_high;
681 __u16 h_i_uid_high;
682 __u16 h_i_gid_high;
683 __u32 h_i_author;
684 } hurd2;
685 struct {
686 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
687 __le16 m_i_file_acl_high;
688 __u32 m_i_reserved2[2];
689 } masix2;
690 } osd2; /* OS dependent 2 */
691 __le16 i_extra_isize;
692 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
693 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
694 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
695 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
696 __le32 i_crtime; /* File Creation time */
697 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
698 __le32 i_version_hi; /* high 32 bits for 64-bit version */
699};
700
701struct move_extent {
702 __u32 reserved; /* should be zero */
703 __u32 donor_fd; /* donor file descriptor */
704 __u64 orig_start; /* logical start offset in block for orig */
705 __u64 donor_start; /* logical start offset in block for donor */
706 __u64 len; /* block length to be moved */
707 __u64 moved_len; /* moved block length */
708};
709
710#define EXT4_EPOCH_BITS 2
711#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
712#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
713
714/*
715 * Extended fields will fit into an inode if the filesystem was formatted
716 * with large inodes (-I 256 or larger) and there are not currently any EAs
717 * consuming all of the available space. For new inodes we always reserve
718 * enough space for the kernel's known extended fields, but for inodes
719 * created with an old kernel this might not have been the case. None of
720 * the extended inode fields is critical for correct filesystem operation.
721 * This macro checks if a certain field fits in the inode. Note that
722 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
723 */
724#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
725 ((offsetof(typeof(*ext4_inode), field) + \
726 sizeof((ext4_inode)->field)) \
727 <= (EXT4_GOOD_OLD_INODE_SIZE + \
728 (einode)->i_extra_isize)) \
729
730static inline __le32 ext4_encode_extra_time(struct timespec *time)
731{
732 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
733 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
734 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
735}
736
737static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
738{
739 if (sizeof(time->tv_sec) > 4)
740 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
741 << 32;
742 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
743}
744
745#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
746do { \
747 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
748 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
749 (raw_inode)->xtime ## _extra = \
750 ext4_encode_extra_time(&(inode)->xtime); \
751} while (0)
752
753#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
754do { \
755 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
756 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
757 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
758 (raw_inode)->xtime ## _extra = \
759 ext4_encode_extra_time(&(einode)->xtime); \
760} while (0)
761
762#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
763do { \
764 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
765 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
766 ext4_decode_extra_time(&(inode)->xtime, \
767 raw_inode->xtime ## _extra); \
768 else \
769 (inode)->xtime.tv_nsec = 0; \
770} while (0)
771
772#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
773do { \
774 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
775 (einode)->xtime.tv_sec = \
776 (signed)le32_to_cpu((raw_inode)->xtime); \
777 else \
778 (einode)->xtime.tv_sec = 0; \
779 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
780 ext4_decode_extra_time(&(einode)->xtime, \
781 raw_inode->xtime ## _extra); \
782 else \
783 (einode)->xtime.tv_nsec = 0; \
784} while (0)
785
786#define i_disk_version osd1.linux1.l_i_version
787
788#if defined(__KERNEL__) || defined(__linux__)
789#define i_reserved1 osd1.linux1.l_i_reserved1
790#define i_file_acl_high osd2.linux2.l_i_file_acl_high
791#define i_blocks_high osd2.linux2.l_i_blocks_high
792#define i_uid_low i_uid
793#define i_gid_low i_gid
794#define i_uid_high osd2.linux2.l_i_uid_high
795#define i_gid_high osd2.linux2.l_i_gid_high
796#define i_checksum_lo osd2.linux2.l_i_checksum_lo
797
798#elif defined(__GNU__)
799
800#define i_translator osd1.hurd1.h_i_translator
801#define i_uid_high osd2.hurd2.h_i_uid_high
802#define i_gid_high osd2.hurd2.h_i_gid_high
803#define i_author osd2.hurd2.h_i_author
804
805#elif defined(__masix__)
806
807#define i_reserved1 osd1.masix1.m_i_reserved1
808#define i_file_acl_high osd2.masix2.m_i_file_acl_high
809#define i_reserved2 osd2.masix2.m_i_reserved2
810
811#endif /* defined(__KERNEL__) || defined(__linux__) */
812
813#include "extents_status.h"
814
815/*
816 * fourth extended file system inode data in memory
817 */
818struct ext4_inode_info {
819 __le32 i_data[15]; /* unconverted */
820 __u32 i_dtime;
821 ext4_fsblk_t i_file_acl;
822
823 /*
824 * i_block_group is the number of the block group which contains
825 * this file's inode. Constant across the lifetime of the inode,
826 * it is ued for making block allocation decisions - we try to
827 * place a file's data blocks near its inode block, and new inodes
828 * near to their parent directory's inode.
829 */
830 ext4_group_t i_block_group;
831 ext4_lblk_t i_dir_start_lookup;
832#if (BITS_PER_LONG < 64)
833 unsigned long i_state_flags; /* Dynamic state flags */
834#endif
835 unsigned long i_flags;
836
837 /*
838 * Extended attributes can be read independently of the main file
839 * data. Taking i_mutex even when reading would cause contention
840 * between readers of EAs and writers of regular file data, so
841 * instead we synchronize on xattr_sem when reading or changing
842 * EAs.
843 */
844 struct rw_semaphore xattr_sem;
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 /*
880 * File creation time. Its function is same as that of
881 * struct timespec i_{a,c,m}time in the generic inode.
882 */
883 struct timespec i_crtime;
884
885 /* mballoc */
886 struct list_head i_prealloc_list;
887 spinlock_t i_prealloc_lock;
888
889 /* extents status tree */
890 struct ext4_es_tree i_es_tree;
891 rwlock_t i_es_lock;
892 struct list_head i_es_lru;
893 unsigned int i_es_lru_nr; /* protected by i_es_lock */
894 unsigned long i_touch_when; /* jiffies of last accessing */
895
896 /* ialloc */
897 ext4_group_t i_last_alloc_group;
898
899 /* allocation reservation info for delalloc */
900 /* In case of bigalloc, these refer to clusters rather than blocks */
901 unsigned int i_reserved_data_blocks;
902 unsigned int i_reserved_meta_blocks;
903 unsigned int i_allocated_meta_blocks;
904 ext4_lblk_t i_da_metadata_calc_last_lblock;
905 int i_da_metadata_calc_len;
906
907 /* on-disk additional length */
908 __u16 i_extra_isize;
909
910 /* Indicate the inline data space. */
911 u16 i_inline_off;
912 u16 i_inline_size;
913
914#ifdef CONFIG_QUOTA
915 /* quota space reservation, managed internally by quota code */
916 qsize_t i_reserved_quota;
917#endif
918
919 /* Lock protecting lists below */
920 spinlock_t i_completed_io_lock;
921 /*
922 * Completed IOs that need unwritten extents handling and have
923 * transaction reserved
924 */
925 struct list_head i_rsv_conversion_list;
926 /*
927 * Completed IOs that need unwritten extents handling and don't have
928 * transaction reserved
929 */
930 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
931 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
932 struct work_struct i_rsv_conversion_work;
933
934 spinlock_t i_block_reservation_lock;
935
936 /*
937 * Transactions that contain inode's metadata needed to complete
938 * fsync and fdatasync, respectively.
939 */
940 tid_t i_sync_tid;
941 tid_t i_datasync_tid;
942
943 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
944 __u32 i_csum_seed;
945};
946
947/*
948 * File system states
949 */
950#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
951#define EXT4_ERROR_FS 0x0002 /* Errors detected */
952#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
953
954/*
955 * Misc. filesystem flags
956 */
957#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
958#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
959#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
960
961/*
962 * Mount flags set via mount options or defaults
963 */
964#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
965#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
966#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
967#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
968#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
969#define EXT4_MOUNT_ERRORS_MASK 0x00070
970#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
971#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
972#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
973#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
974#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
975#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
976#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
977#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
978#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
979#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
980#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
981#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
982#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
983#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
984#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
985#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
986#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
987#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
988#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
989#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
990#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
991#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
992#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
993
994/*
995 * Mount flags set either automatically (could not be set by mount option)
996 * based on per file system feature or property or in special cases such as
997 * distinguishing between explicit mount option definition and default.
998 */
999#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1000 specified delalloc */
1001#define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1002 size of blocksize * 8
1003 blocks */
1004#define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1005 file systems */
1006
1007#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1008 ~EXT4_MOUNT_##opt
1009#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1010 EXT4_MOUNT_##opt
1011#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1012 EXT4_MOUNT_##opt)
1013
1014#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1015 ~EXT4_MOUNT2_##opt
1016#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1017 EXT4_MOUNT2_##opt
1018#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1019 EXT4_MOUNT2_##opt)
1020
1021#define ext4_test_and_set_bit __test_and_set_bit_le
1022#define ext4_set_bit __set_bit_le
1023#define ext4_set_bit_atomic ext2_set_bit_atomic
1024#define ext4_test_and_clear_bit __test_and_clear_bit_le
1025#define ext4_clear_bit __clear_bit_le
1026#define ext4_clear_bit_atomic ext2_clear_bit_atomic
1027#define ext4_test_bit test_bit_le
1028#define ext4_find_next_zero_bit find_next_zero_bit_le
1029#define ext4_find_next_bit find_next_bit_le
1030
1031extern void ext4_set_bits(void *bm, int cur, int len);
1032
1033/*
1034 * Maximal mount counts between two filesystem checks
1035 */
1036#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1037#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1038
1039/*
1040 * Behaviour when detecting errors
1041 */
1042#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1043#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1044#define EXT4_ERRORS_PANIC 3 /* Panic */
1045#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1046
1047/* Metadata checksum algorithm codes */
1048#define EXT4_CRC32C_CHKSUM 1
1049
1050/*
1051 * Structure of the super block
1052 */
1053struct ext4_super_block {
1054/*00*/ __le32 s_inodes_count; /* Inodes count */
1055 __le32 s_blocks_count_lo; /* Blocks count */
1056 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1057 __le32 s_free_blocks_count_lo; /* Free blocks count */
1058/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1059 __le32 s_first_data_block; /* First Data Block */
1060 __le32 s_log_block_size; /* Block size */
1061 __le32 s_log_cluster_size; /* Allocation cluster size */
1062/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1063 __le32 s_clusters_per_group; /* # Clusters per group */
1064 __le32 s_inodes_per_group; /* # Inodes per group */
1065 __le32 s_mtime; /* Mount time */
1066/*30*/ __le32 s_wtime; /* Write time */
1067 __le16 s_mnt_count; /* Mount count */
1068 __le16 s_max_mnt_count; /* Maximal mount count */
1069 __le16 s_magic; /* Magic signature */
1070 __le16 s_state; /* File system state */
1071 __le16 s_errors; /* Behaviour when detecting errors */
1072 __le16 s_minor_rev_level; /* minor revision level */
1073/*40*/ __le32 s_lastcheck; /* time of last check */
1074 __le32 s_checkinterval; /* max. time between checks */
1075 __le32 s_creator_os; /* OS */
1076 __le32 s_rev_level; /* Revision level */
1077/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1078 __le16 s_def_resgid; /* Default gid for reserved blocks */
1079 /*
1080 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1081 *
1082 * Note: the difference between the compatible feature set and
1083 * the incompatible feature set is that if there is a bit set
1084 * in the incompatible feature set that the kernel doesn't
1085 * know about, it should refuse to mount the filesystem.
1086 *
1087 * e2fsck's requirements are more strict; if it doesn't know
1088 * about a feature in either the compatible or incompatible
1089 * feature set, it must abort and not try to meddle with
1090 * things it doesn't understand...
1091 */
1092 __le32 s_first_ino; /* First non-reserved inode */
1093 __le16 s_inode_size; /* size of inode structure */
1094 __le16 s_block_group_nr; /* block group # of this superblock */
1095 __le32 s_feature_compat; /* compatible feature set */
1096/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1097 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1098/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1099/*78*/ char s_volume_name[16]; /* volume name */
1100/*88*/ char s_last_mounted[64]; /* directory where last mounted */
1101/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1102 /*
1103 * Performance hints. Directory preallocation should only
1104 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1105 */
1106 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1107 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1108 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1109 /*
1110 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1111 */
1112/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1113/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1114 __le32 s_journal_dev; /* device number of journal file */
1115 __le32 s_last_orphan; /* start of list of inodes to delete */
1116 __le32 s_hash_seed[4]; /* HTREE hash seed */
1117 __u8 s_def_hash_version; /* Default hash version to use */
1118 __u8 s_jnl_backup_type;
1119 __le16 s_desc_size; /* size of group descriptor */
1120/*100*/ __le32 s_default_mount_opts;
1121 __le32 s_first_meta_bg; /* First metablock block group */
1122 __le32 s_mkfs_time; /* When the filesystem was created */
1123 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1124 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1125/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1126 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1127 __le32 s_free_blocks_count_hi; /* Free blocks count */
1128 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1129 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1130 __le32 s_flags; /* Miscellaneous flags */
1131 __le16 s_raid_stride; /* RAID stride */
1132 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1133 __le64 s_mmp_block; /* Block for multi-mount protection */
1134 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1135 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1136 __u8 s_checksum_type; /* metadata checksum algorithm used */
1137 __le16 s_reserved_pad;
1138 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1139 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1140 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1141 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1142 snapshot's future use */
1143 __le32 s_snapshot_list; /* inode number of the head of the
1144 on-disk snapshot list */
1145#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1146 __le32 s_error_count; /* number of fs errors */
1147 __le32 s_first_error_time; /* first time an error happened */
1148 __le32 s_first_error_ino; /* inode involved in first error */
1149 __le64 s_first_error_block; /* block involved of first error */
1150 __u8 s_first_error_func[32]; /* function where the error happened */
1151 __le32 s_first_error_line; /* line number where error happened */
1152 __le32 s_last_error_time; /* most recent time of an error */
1153 __le32 s_last_error_ino; /* inode involved in last error */
1154 __le32 s_last_error_line; /* line number where error happened */
1155 __le64 s_last_error_block; /* block involved of last error */
1156 __u8 s_last_error_func[32]; /* function where the error happened */
1157#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1158 __u8 s_mount_opts[64];
1159 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1160 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1161 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1162 __le32 s_reserved[108]; /* Padding to the end of the block */
1163 __le32 s_checksum; /* crc32c(superblock) */
1164};
1165
1166#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1167
1168#ifdef __KERNEL__
1169
1170/*
1171 * run-time mount flags
1172 */
1173#define EXT4_MF_MNTDIR_SAMPLED 0x0001
1174#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1175
1176/*
1177 * fourth extended-fs super-block data in memory
1178 */
1179struct ext4_sb_info {
1180 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1181 unsigned long s_inodes_per_block;/* Number of inodes per block */
1182 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1183 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1184 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1185 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1186 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1187 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1188 ext4_group_t s_groups_count; /* Number of groups in the fs */
1189 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1190 unsigned long s_overhead; /* # of fs overhead clusters */
1191 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1192 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1193 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1194 struct buffer_head * s_sbh; /* Buffer containing the super block */
1195 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1196 struct buffer_head **s_group_desc;
1197 unsigned int s_mount_opt;
1198 unsigned int s_mount_opt2;
1199 unsigned int s_mount_flags;
1200 unsigned int s_def_mount_opt;
1201 ext4_fsblk_t s_sb_block;
1202 atomic64_t s_resv_clusters;
1203 kuid_t s_resuid;
1204 kgid_t s_resgid;
1205 unsigned short s_mount_state;
1206 unsigned short s_pad;
1207 int s_addr_per_block_bits;
1208 int s_desc_per_block_bits;
1209 int s_inode_size;
1210 int s_first_ino;
1211 unsigned int s_inode_readahead_blks;
1212 unsigned int s_inode_goal;
1213 spinlock_t s_next_gen_lock;
1214 u32 s_next_generation;
1215 u32 s_hash_seed[4];
1216 int s_def_hash_version;
1217 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1218 struct percpu_counter s_freeclusters_counter;
1219 struct percpu_counter s_freeinodes_counter;
1220 struct percpu_counter s_dirs_counter;
1221 struct percpu_counter s_dirtyclusters_counter;
1222 struct blockgroup_lock *s_blockgroup_lock;
1223 struct proc_dir_entry *s_proc;
1224 struct kobject s_kobj;
1225 struct completion s_kobj_unregister;
1226 struct super_block *s_sb;
1227
1228 /* Journaling */
1229 struct journal_s *s_journal;
1230 struct list_head s_orphan;
1231 struct mutex s_orphan_lock;
1232 unsigned long s_resize_flags; /* Flags indicating if there
1233 is a resizer */
1234 unsigned long s_commit_interval;
1235 u32 s_max_batch_time;
1236 u32 s_min_batch_time;
1237 struct block_device *journal_bdev;
1238#ifdef CONFIG_QUOTA
1239 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1240 int s_jquota_fmt; /* Format of quota to use */
1241#endif
1242 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1243 struct rb_root system_blks;
1244
1245#ifdef EXTENTS_STATS
1246 /* ext4 extents stats */
1247 unsigned long s_ext_min;
1248 unsigned long s_ext_max;
1249 unsigned long s_depth_max;
1250 spinlock_t s_ext_stats_lock;
1251 unsigned long s_ext_blocks;
1252 unsigned long s_ext_extents;
1253#endif
1254
1255 /* for buddy allocator */
1256 struct ext4_group_info ***s_group_info;
1257 struct inode *s_buddy_cache;
1258 spinlock_t s_md_lock;
1259 unsigned short *s_mb_offsets;
1260 unsigned int *s_mb_maxs;
1261 unsigned int s_group_info_size;
1262
1263 /* tunables */
1264 unsigned long s_stripe;
1265 unsigned int s_mb_stream_request;
1266 unsigned int s_mb_max_to_scan;
1267 unsigned int s_mb_min_to_scan;
1268 unsigned int s_mb_stats;
1269 unsigned int s_mb_order2_reqs;
1270 unsigned int s_mb_group_prealloc;
1271 unsigned int s_max_dir_size_kb;
1272 /* where last allocation was done - for stream allocation */
1273 unsigned long s_mb_last_group;
1274 unsigned long s_mb_last_start;
1275
1276 /* stats for buddy allocator */
1277 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1278 atomic_t s_bal_success; /* we found long enough chunks */
1279 atomic_t s_bal_allocated; /* in blocks */
1280 atomic_t s_bal_ex_scanned; /* total extents scanned */
1281 atomic_t s_bal_goals; /* goal hits */
1282 atomic_t s_bal_breaks; /* too long searches */
1283 atomic_t s_bal_2orders; /* 2^order hits */
1284 spinlock_t s_bal_lock;
1285 unsigned long s_mb_buddies_generated;
1286 unsigned long long s_mb_generation_time;
1287 atomic_t s_mb_lost_chunks;
1288 atomic_t s_mb_preallocated;
1289 atomic_t s_mb_discarded;
1290 atomic_t s_lock_busy;
1291
1292 /* locality groups */
1293 struct ext4_locality_group __percpu *s_locality_groups;
1294
1295 /* for write statistics */
1296 unsigned long s_sectors_written_start;
1297 u64 s_kbytes_written;
1298
1299 /* the size of zero-out chunk */
1300 unsigned int s_extent_max_zeroout_kb;
1301
1302 unsigned int s_log_groups_per_flex;
1303 struct flex_groups *s_flex_groups;
1304 ext4_group_t s_flex_groups_allocated;
1305
1306 /* workqueue for reserved extent conversions (buffered io) */
1307 struct workqueue_struct *rsv_conversion_wq;
1308
1309 /* timer for periodic error stats printing */
1310 struct timer_list s_err_report;
1311
1312 /* Lazy inode table initialization info */
1313 struct ext4_li_request *s_li_request;
1314 /* Wait multiplier for lazy initialization thread */
1315 unsigned int s_li_wait_mult;
1316
1317 /* Kernel thread for multiple mount protection */
1318 struct task_struct *s_mmp_tsk;
1319
1320 /* record the last minlen when FITRIM is called. */
1321 atomic_t s_last_trim_minblks;
1322
1323 /* Reference to checksum algorithm driver via cryptoapi */
1324 struct crypto_shash *s_chksum_driver;
1325
1326 /* Precomputed FS UUID checksum for seeding other checksums */
1327 __u32 s_csum_seed;
1328
1329 /* Reclaim extents from extent status tree */
1330 struct shrinker s_es_shrinker;
1331 struct list_head s_es_lru;
1332 unsigned long s_es_last_sorted;
1333 struct percpu_counter s_extent_cache_cnt;
1334 struct mb_cache *s_mb_cache;
1335 spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp;
1336
1337 /* Ratelimit ext4 messages. */
1338 struct ratelimit_state s_err_ratelimit_state;
1339 struct ratelimit_state s_warning_ratelimit_state;
1340 struct ratelimit_state s_msg_ratelimit_state;
1341};
1342
1343static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1344{
1345 return sb->s_fs_info;
1346}
1347static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1348{
1349 return container_of(inode, struct ext4_inode_info, vfs_inode);
1350}
1351
1352static inline struct timespec ext4_current_time(struct inode *inode)
1353{
1354 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1355 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1356}
1357
1358static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1359{
1360 return ino == EXT4_ROOT_INO ||
1361 ino == EXT4_USR_QUOTA_INO ||
1362 ino == EXT4_GRP_QUOTA_INO ||
1363 ino == EXT4_BOOT_LOADER_INO ||
1364 ino == EXT4_JOURNAL_INO ||
1365 ino == EXT4_RESIZE_INO ||
1366 (ino >= EXT4_FIRST_INO(sb) &&
1367 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1368}
1369
1370static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1371 struct ext4_io_end *io_end)
1372{
1373 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1374 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1375 atomic_inc(&EXT4_I(inode)->i_unwritten);
1376 }
1377}
1378
1379static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1380{
1381 return inode->i_private;
1382}
1383
1384static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1385{
1386 inode->i_private = io;
1387}
1388
1389/*
1390 * Inode dynamic state flags
1391 */
1392enum {
1393 EXT4_STATE_JDATA, /* journaled data exists */
1394 EXT4_STATE_NEW, /* inode is newly created */
1395 EXT4_STATE_XATTR, /* has in-inode xattrs */
1396 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1397 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1398 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1399 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1400 EXT4_STATE_NEWENTRY, /* File just added to dir */
1401 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
1402 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
1403 nolocking */
1404 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1405 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */
1406 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1407};
1408
1409#define EXT4_INODE_BIT_FNS(name, field, offset) \
1410static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1411{ \
1412 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1413} \
1414static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1415{ \
1416 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1417} \
1418static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1419{ \
1420 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1421}
1422
1423/* Add these declarations here only so that these functions can be
1424 * found by name. Otherwise, they are very hard to locate. */
1425static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1426static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1427static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1428EXT4_INODE_BIT_FNS(flag, flags, 0)
1429
1430/* Add these declarations here only so that these functions can be
1431 * found by name. Otherwise, they are very hard to locate. */
1432static inline int ext4_test_inode_state(struct inode *inode, int bit);
1433static inline void ext4_set_inode_state(struct inode *inode, int bit);
1434static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1435#if (BITS_PER_LONG < 64)
1436EXT4_INODE_BIT_FNS(state, state_flags, 0)
1437
1438static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1439{
1440 (ei)->i_state_flags = 0;
1441}
1442#else
1443EXT4_INODE_BIT_FNS(state, flags, 32)
1444
1445static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1446{
1447 /* We depend on the fact that callers will set i_flags */
1448}
1449#endif
1450#else
1451/* Assume that user mode programs are passing in an ext4fs superblock, not
1452 * a kernel struct super_block. This will allow us to call the feature-test
1453 * macros from user land. */
1454#define EXT4_SB(sb) (sb)
1455#endif
1456
1457#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1458
1459/*
1460 * Codes for operating systems
1461 */
1462#define EXT4_OS_LINUX 0
1463#define EXT4_OS_HURD 1
1464#define EXT4_OS_MASIX 2
1465#define EXT4_OS_FREEBSD 3
1466#define EXT4_OS_LITES 4
1467
1468/*
1469 * Revision levels
1470 */
1471#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1472#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1473
1474#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1475#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1476
1477#define EXT4_GOOD_OLD_INODE_SIZE 128
1478
1479/*
1480 * Feature set definitions
1481 */
1482
1483#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1484 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1485#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1486 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1487#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1488 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1489#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1490 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1491#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1492 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1493#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1494 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1495#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1496 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1497#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1498 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1499#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1500 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1501
1502#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1503#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1504#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1505#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1506#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1507#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1508
1509#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1510#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1511#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1512#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1513#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1514#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1515#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1516#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1517#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1518/*
1519 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1520 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1521 * all other data structures' checksums. However, the METADATA_CSUM and
1522 * GDT_CSUM bits are mutually exclusive.
1523 */
1524#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1525
1526#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1527#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1528#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1529#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1530#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1531#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1532#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1533#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1534#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1535#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1536#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1537#define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
1538#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1539#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1540
1541#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1542#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1543 EXT4_FEATURE_INCOMPAT_META_BG)
1544#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1545 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1546 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1547
1548#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1549#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1550 EXT4_FEATURE_INCOMPAT_RECOVER| \
1551 EXT4_FEATURE_INCOMPAT_META_BG)
1552#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1553 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1554 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1555
1556#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1557#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1558 EXT4_FEATURE_INCOMPAT_RECOVER| \
1559 EXT4_FEATURE_INCOMPAT_META_BG| \
1560 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1561 EXT4_FEATURE_INCOMPAT_64BIT| \
1562 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1563 EXT4_FEATURE_INCOMPAT_MMP | \
1564 EXT4_FEATURE_INCOMPAT_INLINE_DATA)
1565#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1566 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1567 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1568 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1569 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1570 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1571 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1572 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1573 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1574 EXT4_FEATURE_RO_COMPAT_QUOTA)
1575
1576/*
1577 * Default values for user and/or group using reserved blocks
1578 */
1579#define EXT4_DEF_RESUID 0
1580#define EXT4_DEF_RESGID 0
1581
1582#define EXT4_DEF_INODE_READAHEAD_BLKS 32
1583
1584/*
1585 * Default mount options
1586 */
1587#define EXT4_DEFM_DEBUG 0x0001
1588#define EXT4_DEFM_BSDGROUPS 0x0002
1589#define EXT4_DEFM_XATTR_USER 0x0004
1590#define EXT4_DEFM_ACL 0x0008
1591#define EXT4_DEFM_UID16 0x0010
1592#define EXT4_DEFM_JMODE 0x0060
1593#define EXT4_DEFM_JMODE_DATA 0x0020
1594#define EXT4_DEFM_JMODE_ORDERED 0x0040
1595#define EXT4_DEFM_JMODE_WBACK 0x0060
1596#define EXT4_DEFM_NOBARRIER 0x0100
1597#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1598#define EXT4_DEFM_DISCARD 0x0400
1599#define EXT4_DEFM_NODELALLOC 0x0800
1600
1601/*
1602 * Default journal batch times
1603 */
1604#define EXT4_DEF_MIN_BATCH_TIME 0
1605#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1606
1607/*
1608 * Minimum number of groups in a flexgroup before we separate out
1609 * directories into the first block group of a flexgroup
1610 */
1611#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1612
1613/*
1614 * Structure of a directory entry
1615 */
1616#define EXT4_NAME_LEN 255
1617
1618struct ext4_dir_entry {
1619 __le32 inode; /* Inode number */
1620 __le16 rec_len; /* Directory entry length */
1621 __le16 name_len; /* Name length */
1622 char name[EXT4_NAME_LEN]; /* File name */
1623};
1624
1625/*
1626 * The new version of the directory entry. Since EXT4 structures are
1627 * stored in intel byte order, and the name_len field could never be
1628 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1629 * file_type field.
1630 */
1631struct ext4_dir_entry_2 {
1632 __le32 inode; /* Inode number */
1633 __le16 rec_len; /* Directory entry length */
1634 __u8 name_len; /* Name length */
1635 __u8 file_type;
1636 char name[EXT4_NAME_LEN]; /* File name */
1637};
1638
1639/*
1640 * This is a bogus directory entry at the end of each leaf block that
1641 * records checksums.
1642 */
1643struct ext4_dir_entry_tail {
1644 __le32 det_reserved_zero1; /* Pretend to be unused */
1645 __le16 det_rec_len; /* 12 */
1646 __u8 det_reserved_zero2; /* Zero name length */
1647 __u8 det_reserved_ft; /* 0xDE, fake file type */
1648 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1649};
1650
1651#define EXT4_DIRENT_TAIL(block, blocksize) \
1652 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1653 ((blocksize) - \
1654 sizeof(struct ext4_dir_entry_tail))))
1655
1656/*
1657 * Ext4 directory file types. Only the low 3 bits are used. The
1658 * other bits are reserved for now.
1659 */
1660#define EXT4_FT_UNKNOWN 0
1661#define EXT4_FT_REG_FILE 1
1662#define EXT4_FT_DIR 2
1663#define EXT4_FT_CHRDEV 3
1664#define EXT4_FT_BLKDEV 4
1665#define EXT4_FT_FIFO 5
1666#define EXT4_FT_SOCK 6
1667#define EXT4_FT_SYMLINK 7
1668
1669#define EXT4_FT_MAX 8
1670
1671#define EXT4_FT_DIR_CSUM 0xDE
1672
1673/*
1674 * EXT4_DIR_PAD defines the directory entries boundaries
1675 *
1676 * NOTE: It must be a multiple of 4
1677 */
1678#define EXT4_DIR_PAD 4
1679#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1680#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1681 ~EXT4_DIR_ROUND)
1682#define EXT4_MAX_REC_LEN ((1<<16)-1)
1683
1684/*
1685 * If we ever get support for fs block sizes > page_size, we'll need
1686 * to remove the #if statements in the next two functions...
1687 */
1688static inline unsigned int
1689ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1690{
1691 unsigned len = le16_to_cpu(dlen);
1692
1693#if (PAGE_CACHE_SIZE >= 65536)
1694 if (len == EXT4_MAX_REC_LEN || len == 0)
1695 return blocksize;
1696 return (len & 65532) | ((len & 3) << 16);
1697#else
1698 return len;
1699#endif
1700}
1701
1702static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1703{
1704 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1705 BUG();
1706#if (PAGE_CACHE_SIZE >= 65536)
1707 if (len < 65536)
1708 return cpu_to_le16(len);
1709 if (len == blocksize) {
1710 if (blocksize == 65536)
1711 return cpu_to_le16(EXT4_MAX_REC_LEN);
1712 else
1713 return cpu_to_le16(0);
1714 }
1715 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1716#else
1717 return cpu_to_le16(len);
1718#endif
1719}
1720
1721/*
1722 * Hash Tree Directory indexing
1723 * (c) Daniel Phillips, 2001
1724 */
1725
1726#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1727 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1728 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1729#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1730#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1731
1732/* Legal values for the dx_root hash_version field: */
1733
1734#define DX_HASH_LEGACY 0
1735#define DX_HASH_HALF_MD4 1
1736#define DX_HASH_TEA 2
1737#define DX_HASH_LEGACY_UNSIGNED 3
1738#define DX_HASH_HALF_MD4_UNSIGNED 4
1739#define DX_HASH_TEA_UNSIGNED 5
1740
1741static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1742 const void *address, unsigned int length)
1743{
1744 struct {
1745 struct shash_desc shash;
1746 char ctx[4];
1747 } desc;
1748 int err;
1749
1750 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1751
1752 desc.shash.tfm = sbi->s_chksum_driver;
1753 desc.shash.flags = 0;
1754 *(u32 *)desc.ctx = crc;
1755
1756 err = crypto_shash_update(&desc.shash, address, length);
1757 BUG_ON(err);
1758
1759 return *(u32 *)desc.ctx;
1760}
1761
1762#ifdef __KERNEL__
1763
1764/* hash info structure used by the directory hash */
1765struct dx_hash_info
1766{
1767 u32 hash;
1768 u32 minor_hash;
1769 int hash_version;
1770 u32 *seed;
1771};
1772
1773
1774/* 32 and 64 bit signed EOF for dx directories */
1775#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1776#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1777
1778
1779/*
1780 * Control parameters used by ext4_htree_next_block
1781 */
1782#define HASH_NB_ALWAYS 1
1783
1784
1785/*
1786 * Describe an inode's exact location on disk and in memory
1787 */
1788struct ext4_iloc
1789{
1790 struct buffer_head *bh;
1791 unsigned long offset;
1792 ext4_group_t block_group;
1793};
1794
1795static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1796{
1797 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1798}
1799
1800/*
1801 * This structure is stuffed into the struct file's private_data field
1802 * for directories. It is where we put information so that we can do
1803 * readdir operations in hash tree order.
1804 */
1805struct dir_private_info {
1806 struct rb_root root;
1807 struct rb_node *curr_node;
1808 struct fname *extra_fname;
1809 loff_t last_pos;
1810 __u32 curr_hash;
1811 __u32 curr_minor_hash;
1812 __u32 next_hash;
1813};
1814
1815/* calculate the first block number of the group */
1816static inline ext4_fsblk_t
1817ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1818{
1819 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1820 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1821}
1822
1823/*
1824 * Special error return code only used by dx_probe() and its callers.
1825 */
1826#define ERR_BAD_DX_DIR -75000
1827
1828/*
1829 * Timeout and state flag for lazy initialization inode thread.
1830 */
1831#define EXT4_DEF_LI_WAIT_MULT 10
1832#define EXT4_DEF_LI_MAX_START_DELAY 5
1833#define EXT4_LAZYINIT_QUIT 0x0001
1834#define EXT4_LAZYINIT_RUNNING 0x0002
1835
1836/*
1837 * Lazy inode table initialization info
1838 */
1839struct ext4_lazy_init {
1840 unsigned long li_state;
1841 struct list_head li_request_list;
1842 struct mutex li_list_mtx;
1843};
1844
1845struct ext4_li_request {
1846 struct super_block *lr_super;
1847 struct ext4_sb_info *lr_sbi;
1848 ext4_group_t lr_next_group;
1849 struct list_head lr_request;
1850 unsigned long lr_next_sched;
1851 unsigned long lr_timeout;
1852};
1853
1854struct ext4_features {
1855 struct kobject f_kobj;
1856 struct completion f_kobj_unregister;
1857};
1858
1859/*
1860 * This structure will be used for multiple mount protection. It will be
1861 * written into the block number saved in the s_mmp_block field in the
1862 * superblock. Programs that check MMP should assume that if
1863 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1864 * to use the filesystem, regardless of how old the timestamp is.
1865 */
1866#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1867#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1868#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1869#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1870
1871struct mmp_struct {
1872 __le32 mmp_magic; /* Magic number for MMP */
1873 __le32 mmp_seq; /* Sequence no. updated periodically */
1874
1875 /*
1876 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1877 * purposes and do not affect the correctness of the algorithm
1878 */
1879 __le64 mmp_time; /* Time last updated */
1880 char mmp_nodename[64]; /* Node which last updated MMP block */
1881 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1882
1883 /*
1884 * mmp_check_interval is used to verify if the MMP block has been
1885 * updated on the block device. The value is updated based on the
1886 * maximum time to write the MMP block during an update cycle.
1887 */
1888 __le16 mmp_check_interval;
1889
1890 __le16 mmp_pad1;
1891 __le32 mmp_pad2[226];
1892 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
1893};
1894
1895/* arguments passed to the mmp thread */
1896struct mmpd_data {
1897 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1898 struct super_block *sb; /* super block of the fs */
1899};
1900
1901/*
1902 * Check interval multiplier
1903 * The MMP block is written every update interval and initially checked every
1904 * update interval x the multiplier (the value is then adapted based on the
1905 * write latency). The reason is that writes can be delayed under load and we
1906 * don't want readers to incorrectly assume that the filesystem is no longer
1907 * in use.
1908 */
1909#define EXT4_MMP_CHECK_MULT 2UL
1910
1911/*
1912 * Minimum interval for MMP checking in seconds.
1913 */
1914#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1915
1916/*
1917 * Maximum interval for MMP checking in seconds.
1918 */
1919#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1920
1921/*
1922 * Function prototypes
1923 */
1924
1925/*
1926 * Ok, these declarations are also in <linux/kernel.h> but none of the
1927 * ext4 source programs needs to include it so they are duplicated here.
1928 */
1929# define NORET_TYPE /**/
1930# define ATTRIB_NORET __attribute__((noreturn))
1931# define NORET_AND noreturn,
1932
1933/* bitmap.c */
1934extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
1935void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1936 struct ext4_group_desc *gdp,
1937 struct buffer_head *bh, int sz);
1938int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1939 struct ext4_group_desc *gdp,
1940 struct buffer_head *bh, int sz);
1941void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1942 struct ext4_group_desc *gdp,
1943 struct buffer_head *bh);
1944int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1945 struct ext4_group_desc *gdp,
1946 struct buffer_head *bh);
1947
1948/* balloc.c */
1949extern void ext4_get_group_no_and_offset(struct super_block *sb,
1950 ext4_fsblk_t blocknr,
1951 ext4_group_t *blockgrpp,
1952 ext4_grpblk_t *offsetp);
1953extern ext4_group_t ext4_get_group_number(struct super_block *sb,
1954 ext4_fsblk_t block);
1955
1956extern void ext4_validate_block_bitmap(struct super_block *sb,
1957 struct ext4_group_desc *desc,
1958 ext4_group_t block_group,
1959 struct buffer_head *bh);
1960extern unsigned int ext4_block_group(struct super_block *sb,
1961 ext4_fsblk_t blocknr);
1962extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1963 ext4_fsblk_t blocknr);
1964extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1965extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1966 ext4_group_t group);
1967extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1968 ext4_fsblk_t goal,
1969 unsigned int flags,
1970 unsigned long *count,
1971 int *errp);
1972extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1973 s64 nclusters, unsigned int flags);
1974extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
1975extern void ext4_check_blocks_bitmap(struct super_block *);
1976extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1977 ext4_group_t block_group,
1978 struct buffer_head ** bh);
1979extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1980
1981extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
1982 ext4_group_t block_group);
1983extern int ext4_wait_block_bitmap(struct super_block *sb,
1984 ext4_group_t block_group,
1985 struct buffer_head *bh);
1986extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1987 ext4_group_t block_group);
1988extern void ext4_init_block_bitmap(struct super_block *sb,
1989 struct buffer_head *bh,
1990 ext4_group_t group,
1991 struct ext4_group_desc *desc);
1992extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
1993 ext4_group_t block_group,
1994 struct ext4_group_desc *gdp);
1995extern unsigned ext4_num_overhead_clusters(struct super_block *sb,
1996 ext4_group_t block_group,
1997 struct ext4_group_desc *gdp);
1998ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
1999
2000/* dir.c */
2001extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2002 struct file *,
2003 struct ext4_dir_entry_2 *,
2004 struct buffer_head *, char *, int,
2005 unsigned int);
2006#define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2007 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2008 (de), (bh), (buf), (size), (offset)))
2009extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2010 __u32 minor_hash,
2011 struct ext4_dir_entry_2 *dirent);
2012extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2013extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2014 struct buffer_head *bh,
2015 void *buf, int buf_size,
2016 const char *name, int namelen,
2017 struct ext4_dir_entry_2 **dest_de);
2018void ext4_insert_dentry(struct inode *inode,
2019 struct ext4_dir_entry_2 *de,
2020 int buf_size,
2021 const char *name, int namelen);
2022static inline void ext4_update_dx_flag(struct inode *inode)
2023{
2024 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb,
2025 EXT4_FEATURE_COMPAT_DIR_INDEX))
2026 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2027}
2028static unsigned char ext4_filetype_table[] = {
2029 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2030};
2031
2032static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2033{
2034 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) ||
2035 (filetype >= EXT4_FT_MAX))
2036 return DT_UNKNOWN;
2037
2038 return ext4_filetype_table[filetype];
2039}
2040
2041/* fsync.c */
2042extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2043
2044/* hash.c */
2045extern int ext4fs_dirhash(const char *name, int len, struct
2046 dx_hash_info *hinfo);
2047
2048/* ialloc.c */
2049extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2050 const struct qstr *qstr, __u32 goal,
2051 uid_t *owner, int handle_type,
2052 unsigned int line_no, int nblocks);
2053
2054#define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2055 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2056 0, 0, 0)
2057#define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2058 type, nblocks) \
2059 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2060 (type), __LINE__, (nblocks))
2061
2062
2063extern void ext4_free_inode(handle_t *, struct inode *);
2064extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2065extern unsigned long ext4_count_free_inodes(struct super_block *);
2066extern unsigned long ext4_count_dirs(struct super_block *);
2067extern void ext4_check_inodes_bitmap(struct super_block *);
2068extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2069extern int ext4_init_inode_table(struct super_block *sb,
2070 ext4_group_t group, int barrier);
2071extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2072
2073/* mballoc.c */
2074extern long ext4_mb_stats;
2075extern long ext4_mb_max_to_scan;
2076extern int ext4_mb_init(struct super_block *);
2077extern int ext4_mb_release(struct super_block *);
2078extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2079 struct ext4_allocation_request *, int *);
2080extern int ext4_mb_reserve_blocks(struct super_block *, int);
2081extern void ext4_discard_preallocations(struct inode *);
2082extern int __init ext4_init_mballoc(void);
2083extern void ext4_exit_mballoc(void);
2084extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2085 struct buffer_head *bh, ext4_fsblk_t block,
2086 unsigned long count, int flags);
2087extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2088 ext4_group_t ngroups);
2089extern int ext4_mb_add_groupinfo(struct super_block *sb,
2090 ext4_group_t i, struct ext4_group_desc *desc);
2091extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2092 ext4_fsblk_t block, unsigned long count);
2093extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2094
2095/* inode.c */
2096struct buffer_head *ext4_getblk(handle_t *, struct inode *,
2097 ext4_lblk_t, int, int *);
2098struct buffer_head *ext4_bread(handle_t *, struct inode *,
2099 ext4_lblk_t, int, int *);
2100int ext4_get_block_write(struct inode *inode, sector_t iblock,
2101 struct buffer_head *bh_result, int create);
2102int ext4_get_block(struct inode *inode, sector_t iblock,
2103 struct buffer_head *bh_result, int create);
2104int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2105 struct buffer_head *bh, int create);
2106int ext4_walk_page_buffers(handle_t *handle,
2107 struct buffer_head *head,
2108 unsigned from,
2109 unsigned to,
2110 int *partial,
2111 int (*fn)(handle_t *handle,
2112 struct buffer_head *bh));
2113int do_journal_get_write_access(handle_t *handle,
2114 struct buffer_head *bh);
2115#define FALL_BACK_TO_NONDELALLOC 1
2116#define CONVERT_INLINE_DATA 2
2117
2118extern struct inode *ext4_iget(struct super_block *, unsigned long);
2119extern int ext4_write_inode(struct inode *, struct writeback_control *);
2120extern int ext4_setattr(struct dentry *, struct iattr *);
2121extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2122 struct kstat *stat);
2123extern void ext4_evict_inode(struct inode *);
2124extern void ext4_clear_inode(struct inode *);
2125extern int ext4_sync_inode(handle_t *, struct inode *);
2126extern void ext4_dirty_inode(struct inode *, int);
2127extern int ext4_change_inode_journal_flag(struct inode *, int);
2128extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2129extern int ext4_inode_attach_jinode(struct inode *inode);
2130extern int ext4_can_truncate(struct inode *inode);
2131extern void ext4_truncate(struct inode *);
2132extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2133extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2134extern void ext4_set_inode_flags(struct inode *);
2135extern void ext4_get_inode_flags(struct ext4_inode_info *);
2136extern int ext4_alloc_da_blocks(struct inode *inode);
2137extern void ext4_set_aops(struct inode *inode);
2138extern int ext4_writepage_trans_blocks(struct inode *);
2139extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2140extern int ext4_block_truncate_page(handle_t *handle,
2141 struct address_space *mapping, loff_t from);
2142extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2143 loff_t lstart, loff_t lend);
2144extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2145extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2146extern void ext4_da_update_reserve_space(struct inode *inode,
2147 int used, int quota_claim);
2148
2149/* indirect.c */
2150extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2151 struct ext4_map_blocks *map, int flags);
2152extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
2153 const struct iovec *iov, loff_t offset,
2154 unsigned long nr_segs);
2155extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2156extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2157extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2158extern int ext4_free_hole_blocks(handle_t *handle, struct inode *inode,
2159 ext4_lblk_t first, ext4_lblk_t stop);
2160
2161/* ioctl.c */
2162extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2163extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2164
2165/* migrate.c */
2166extern int ext4_ext_migrate(struct inode *);
2167extern int ext4_ind_migrate(struct inode *inode);
2168
2169/* namei.c */
2170extern int ext4_dirent_csum_verify(struct inode *inode,
2171 struct ext4_dir_entry *dirent);
2172extern int ext4_orphan_add(handle_t *, struct inode *);
2173extern int ext4_orphan_del(handle_t *, struct inode *);
2174extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2175 __u32 start_minor_hash, __u32 *next_hash);
2176extern int search_dir(struct buffer_head *bh,
2177 char *search_buf,
2178 int buf_size,
2179 struct inode *dir,
2180 const struct qstr *d_name,
2181 unsigned int offset,
2182 struct ext4_dir_entry_2 **res_dir);
2183extern int ext4_generic_delete_entry(handle_t *handle,
2184 struct inode *dir,
2185 struct ext4_dir_entry_2 *de_del,
2186 struct buffer_head *bh,
2187 void *entry_buf,
2188 int buf_size,
2189 int csum_size);
2190
2191/* resize.c */
2192extern int ext4_group_add(struct super_block *sb,
2193 struct ext4_new_group_data *input);
2194extern int ext4_group_extend(struct super_block *sb,
2195 struct ext4_super_block *es,
2196 ext4_fsblk_t n_blocks_count);
2197extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2198
2199/* super.c */
2200extern int ext4_calculate_overhead(struct super_block *sb);
2201extern int ext4_superblock_csum_verify(struct super_block *sb,
2202 struct ext4_super_block *es);
2203extern void ext4_superblock_csum_set(struct super_block *sb);
2204extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2205extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2206extern void ext4_kvfree(void *ptr);
2207extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2208 ext4_group_t ngroup);
2209extern const char *ext4_decode_error(struct super_block *sb, int errno,
2210 char nbuf[16]);
2211
2212extern __printf(4, 5)
2213void __ext4_error(struct super_block *, const char *, unsigned int,
2214 const char *, ...);
2215extern __printf(5, 6)
2216void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2217 const char *, ...);
2218extern __printf(5, 6)
2219void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2220 const char *, ...);
2221extern void __ext4_std_error(struct super_block *, const char *,
2222 unsigned int, int);
2223extern __printf(4, 5)
2224void __ext4_abort(struct super_block *, const char *, unsigned int,
2225 const char *, ...);
2226extern __printf(4, 5)
2227void __ext4_warning(struct super_block *, const char *, unsigned int,
2228 const char *, ...);
2229extern __printf(3, 4)
2230void __ext4_msg(struct super_block *, const char *, const char *, ...);
2231extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2232 const char *, unsigned int, const char *);
2233extern __printf(7, 8)
2234void __ext4_grp_locked_error(const char *, unsigned int,
2235 struct super_block *, ext4_group_t,
2236 unsigned long, ext4_fsblk_t,
2237 const char *, ...);
2238
2239#ifdef CONFIG_PRINTK
2240
2241#define ext4_error_inode(inode, func, line, block, fmt, ...) \
2242 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2243#define ext4_error_file(file, func, line, block, fmt, ...) \
2244 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2245#define ext4_error(sb, fmt, ...) \
2246 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2247#define ext4_abort(sb, fmt, ...) \
2248 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2249#define ext4_warning(sb, fmt, ...) \
2250 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2251#define ext4_msg(sb, level, fmt, ...) \
2252 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2253#define dump_mmp_msg(sb, mmp, msg) \
2254 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2255#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2256 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2257 fmt, ##__VA_ARGS__)
2258
2259#else
2260
2261#define ext4_error_inode(inode, func, line, block, fmt, ...) \
2262do { \
2263 no_printk(fmt, ##__VA_ARGS__); \
2264 __ext4_error_inode(inode, "", 0, block, " "); \
2265} while (0)
2266#define ext4_error_file(file, func, line, block, fmt, ...) \
2267do { \
2268 no_printk(fmt, ##__VA_ARGS__); \
2269 __ext4_error_file(file, "", 0, block, " "); \
2270} while (0)
2271#define ext4_error(sb, fmt, ...) \
2272do { \
2273 no_printk(fmt, ##__VA_ARGS__); \
2274 __ext4_error(sb, "", 0, " "); \
2275} while (0)
2276#define ext4_abort(sb, fmt, ...) \
2277do { \
2278 no_printk(fmt, ##__VA_ARGS__); \
2279 __ext4_abort(sb, "", 0, " "); \
2280} while (0)
2281#define ext4_warning(sb, fmt, ...) \
2282do { \
2283 no_printk(fmt, ##__VA_ARGS__); \
2284 __ext4_warning(sb, "", 0, " "); \
2285} while (0)
2286#define ext4_msg(sb, level, fmt, ...) \
2287do { \
2288 no_printk(fmt, ##__VA_ARGS__); \
2289 __ext4_msg(sb, "", " "); \
2290} while (0)
2291#define dump_mmp_msg(sb, mmp, msg) \
2292 __dump_mmp_msg(sb, mmp, "", 0, "")
2293#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2294do { \
2295 no_printk(fmt, ##__VA_ARGS__); \
2296 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
2297} while (0)
2298
2299#endif
2300
2301extern void ext4_update_dynamic_rev(struct super_block *sb);
2302extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2303 __u32 compat);
2304extern int ext4_update_rocompat_feature(handle_t *handle,
2305 struct super_block *sb, __u32 rocompat);
2306extern int ext4_update_incompat_feature(handle_t *handle,
2307 struct super_block *sb, __u32 incompat);
2308extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2309 struct ext4_group_desc *bg);
2310extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2311 struct ext4_group_desc *bg);
2312extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2313 struct ext4_group_desc *bg);
2314extern __u32 ext4_free_group_clusters(struct super_block *sb,
2315 struct ext4_group_desc *bg);
2316extern __u32 ext4_free_inodes_count(struct super_block *sb,
2317 struct ext4_group_desc *bg);
2318extern __u32 ext4_used_dirs_count(struct super_block *sb,
2319 struct ext4_group_desc *bg);
2320extern __u32 ext4_itable_unused_count(struct super_block *sb,
2321 struct ext4_group_desc *bg);
2322extern void ext4_block_bitmap_set(struct super_block *sb,
2323 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2324extern void ext4_inode_bitmap_set(struct super_block *sb,
2325 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2326extern void ext4_inode_table_set(struct super_block *sb,
2327 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2328extern void ext4_free_group_clusters_set(struct super_block *sb,
2329 struct ext4_group_desc *bg,
2330 __u32 count);
2331extern void ext4_free_inodes_set(struct super_block *sb,
2332 struct ext4_group_desc *bg, __u32 count);
2333extern void ext4_used_dirs_set(struct super_block *sb,
2334 struct ext4_group_desc *bg, __u32 count);
2335extern void ext4_itable_unused_set(struct super_block *sb,
2336 struct ext4_group_desc *bg, __u32 count);
2337extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2338 struct ext4_group_desc *gdp);
2339extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2340 struct ext4_group_desc *gdp);
2341extern int ext4_register_li_request(struct super_block *sb,
2342 ext4_group_t first_not_zeroed);
2343
2344static inline int ext4_has_group_desc_csum(struct super_block *sb)
2345{
2346 return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2347 EXT4_FEATURE_RO_COMPAT_GDT_CSUM |
2348 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
2349}
2350
2351static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2352{
2353 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2354 le32_to_cpu(es->s_blocks_count_lo);
2355}
2356
2357static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2358{
2359 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2360 le32_to_cpu(es->s_r_blocks_count_lo);
2361}
2362
2363static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2364{
2365 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2366 le32_to_cpu(es->s_free_blocks_count_lo);
2367}
2368
2369static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2370 ext4_fsblk_t blk)
2371{
2372 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2373 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2374}
2375
2376static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2377 ext4_fsblk_t blk)
2378{
2379 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2380 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2381}
2382
2383static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2384 ext4_fsblk_t blk)
2385{
2386 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2387 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2388}
2389
2390static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2391{
2392 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2393 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2394 le32_to_cpu(raw_inode->i_size_lo);
2395 else
2396 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2397}
2398
2399static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2400{
2401 raw_inode->i_size_lo = cpu_to_le32(i_size);
2402 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2403}
2404
2405static inline
2406struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2407 ext4_group_t group)
2408{
2409 struct ext4_group_info ***grp_info;
2410 long indexv, indexh;
2411 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2412 grp_info = EXT4_SB(sb)->s_group_info;
2413 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2414 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2415 return grp_info[indexv][indexh];
2416}
2417
2418/*
2419 * Reading s_groups_count requires using smp_rmb() afterwards. See
2420 * the locking protocol documented in the comments of ext4_group_add()
2421 * in resize.c
2422 */
2423static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2424{
2425 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2426
2427 smp_rmb();
2428 return ngroups;
2429}
2430
2431static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2432 ext4_group_t block_group)
2433{
2434 return block_group >> sbi->s_log_groups_per_flex;
2435}
2436
2437static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2438{
2439 return 1 << sbi->s_log_groups_per_flex;
2440}
2441
2442#define ext4_std_error(sb, errno) \
2443do { \
2444 if ((errno)) \
2445 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2446} while (0)
2447
2448#ifdef CONFIG_SMP
2449/* Each CPU can accumulate percpu_counter_batch clusters in their local
2450 * counters. So we need to make sure we have free clusters more
2451 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2452 */
2453#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2454#else
2455#define EXT4_FREECLUSTERS_WATERMARK 0
2456#endif
2457
2458/* Update i_disksize. Requires i_mutex to avoid races with truncate */
2459static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2460{
2461 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2462 !mutex_is_locked(&inode->i_mutex));
2463 down_write(&EXT4_I(inode)->i_data_sem);
2464 if (newsize > EXT4_I(inode)->i_disksize)
2465 EXT4_I(inode)->i_disksize = newsize;
2466 up_write(&EXT4_I(inode)->i_data_sem);
2467}
2468
2469struct ext4_group_info {
2470 unsigned long bb_state;
2471 struct rb_root bb_free_root;
2472 ext4_grpblk_t bb_first_free; /* first free block */
2473 ext4_grpblk_t bb_free; /* total free blocks */
2474 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2475 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2476 struct list_head bb_prealloc_list;
2477#ifdef DOUBLE_CHECK
2478 void *bb_bitmap;
2479#endif
2480 struct rw_semaphore alloc_sem;
2481 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2482 * regions, index is order.
2483 * bb_counters[3] = 5 means
2484 * 5 free 8-block regions. */
2485};
2486
2487#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2488#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2489#define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
2490#define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
2491
2492#define EXT4_MB_GRP_NEED_INIT(grp) \
2493 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2494#define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
2495 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2496#define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
2497 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2498
2499#define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2500 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2501#define EXT4_MB_GRP_SET_TRIMMED(grp) \
2502 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2503#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2504 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2505
2506#define EXT4_MAX_CONTENTION 8
2507#define EXT4_CONTENTION_THRESHOLD 2
2508
2509static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2510 ext4_group_t group)
2511{
2512 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2513}
2514
2515/*
2516 * Returns true if the filesystem is busy enough that attempts to
2517 * access the block group locks has run into contention.
2518 */
2519static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2520{
2521 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2522}
2523
2524static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2525{
2526 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2527 if (spin_trylock(lock))
2528 /*
2529 * We're able to grab the lock right away, so drop the
2530 * lock contention counter.
2531 */
2532 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2533 else {
2534 /*
2535 * The lock is busy, so bump the contention counter,
2536 * and then wait on the spin lock.
2537 */
2538 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2539 EXT4_MAX_CONTENTION);
2540 spin_lock(lock);
2541 }
2542}
2543
2544static inline void ext4_unlock_group(struct super_block *sb,
2545 ext4_group_t group)
2546{
2547 spin_unlock(ext4_group_lock_ptr(sb, group));
2548}
2549
2550/*
2551 * Block validity checking
2552 */
2553#define ext4_check_indirect_blockref(inode, bh) \
2554 ext4_check_blockref(__func__, __LINE__, inode, \
2555 (__le32 *)(bh)->b_data, \
2556 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2557
2558#define ext4_ind_check_inode(inode) \
2559 ext4_check_blockref(__func__, __LINE__, inode, \
2560 EXT4_I(inode)->i_data, \
2561 EXT4_NDIR_BLOCKS)
2562
2563/*
2564 * Inodes and files operations
2565 */
2566
2567/* dir.c */
2568extern const struct file_operations ext4_dir_operations;
2569
2570/* file.c */
2571extern const struct inode_operations ext4_file_inode_operations;
2572extern const struct file_operations ext4_file_operations;
2573extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2574extern void ext4_unwritten_wait(struct inode *inode);
2575
2576/* inline.c */
2577extern int ext4_has_inline_data(struct inode *inode);
2578extern int ext4_get_inline_size(struct inode *inode);
2579extern int ext4_get_max_inline_size(struct inode *inode);
2580extern int ext4_find_inline_data_nolock(struct inode *inode);
2581extern void ext4_write_inline_data(struct inode *inode,
2582 struct ext4_iloc *iloc,
2583 void *buffer, loff_t pos,
2584 unsigned int len);
2585extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
2586 unsigned int len);
2587extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2588 unsigned int len);
2589extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2590
2591extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2592extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2593 struct inode *inode,
2594 loff_t pos, unsigned len,
2595 unsigned flags,
2596 struct page **pagep);
2597extern int ext4_write_inline_data_end(struct inode *inode,
2598 loff_t pos, unsigned len,
2599 unsigned copied,
2600 struct page *page);
2601extern struct buffer_head *
2602ext4_journalled_write_inline_data(struct inode *inode,
2603 unsigned len,
2604 struct page *page);
2605extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
2606 struct inode *inode,
2607 loff_t pos, unsigned len,
2608 unsigned flags,
2609 struct page **pagep,
2610 void **fsdata);
2611extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
2612 unsigned len, unsigned copied,
2613 struct page *page);
2614extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
2615 struct inode *inode);
2616extern int ext4_try_create_inline_dir(handle_t *handle,
2617 struct inode *parent,
2618 struct inode *inode);
2619extern int ext4_read_inline_dir(struct file *filp,
2620 struct dir_context *ctx,
2621 int *has_inline_data);
2622extern int htree_inlinedir_to_tree(struct file *dir_file,
2623 struct inode *dir, ext4_lblk_t block,
2624 struct dx_hash_info *hinfo,
2625 __u32 start_hash, __u32 start_minor_hash,
2626 int *has_inline_data);
2627extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
2628 const struct qstr *d_name,
2629 struct ext4_dir_entry_2 **res_dir,
2630 int *has_inline_data);
2631extern int ext4_delete_inline_entry(handle_t *handle,
2632 struct inode *dir,
2633 struct ext4_dir_entry_2 *de_del,
2634 struct buffer_head *bh,
2635 int *has_inline_data);
2636extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
2637extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
2638 struct ext4_dir_entry_2 **parent_de,
2639 int *retval);
2640extern int ext4_inline_data_fiemap(struct inode *inode,
2641 struct fiemap_extent_info *fieinfo,
2642 int *has_inline);
2643extern int ext4_try_to_evict_inline_data(handle_t *handle,
2644 struct inode *inode,
2645 int needed);
2646extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
2647
2648extern int ext4_convert_inline_data(struct inode *inode);
2649
2650/* namei.c */
2651extern const struct inode_operations ext4_dir_inode_operations;
2652extern const struct inode_operations ext4_special_inode_operations;
2653extern struct dentry *ext4_get_parent(struct dentry *child);
2654extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
2655 struct ext4_dir_entry_2 *de,
2656 int blocksize, int csum_size,
2657 unsigned int parent_ino, int dotdot_real_len);
2658extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
2659 unsigned int blocksize);
2660extern int ext4_handle_dirty_dirent_node(handle_t *handle,
2661 struct inode *inode,
2662 struct buffer_head *bh);
2663#define S_SHIFT 12
2664static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
2665 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
2666 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
2667 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
2668 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
2669 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
2670 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
2671 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
2672};
2673
2674static inline void ext4_set_de_type(struct super_block *sb,
2675 struct ext4_dir_entry_2 *de,
2676 umode_t mode) {
2677 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE))
2678 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
2679}
2680
2681
2682/* symlink.c */
2683extern const struct inode_operations ext4_symlink_inode_operations;
2684extern const struct inode_operations ext4_fast_symlink_inode_operations;
2685
2686/* block_validity */
2687extern void ext4_release_system_zone(struct super_block *sb);
2688extern int ext4_setup_system_zone(struct super_block *sb);
2689extern int __init ext4_init_system_zone(void);
2690extern void ext4_exit_system_zone(void);
2691extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2692 ext4_fsblk_t start_blk,
2693 unsigned int count);
2694extern int ext4_check_blockref(const char *, unsigned int,
2695 struct inode *, __le32 *, unsigned int);
2696
2697/* extents.c */
2698struct ext4_ext_path;
2699struct ext4_extent;
2700
2701/*
2702 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
2703 * __le32.
2704 */
2705#define EXT_MAX_BLOCKS 0xffffffff
2706
2707extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2708extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2709extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
2710extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2711 struct ext4_map_blocks *map, int flags);
2712extern void ext4_ext_truncate(handle_t *, struct inode *);
2713extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
2714 ext4_lblk_t end);
2715extern void ext4_ext_init(struct super_block *);
2716extern void ext4_ext_release(struct super_block *);
2717extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2718 loff_t len);
2719extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
2720 loff_t offset, ssize_t len);
2721extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2722 struct ext4_map_blocks *map, int flags);
2723extern int ext4_ext_calc_metadata_amount(struct inode *inode,
2724 ext4_lblk_t lblocks);
2725extern int ext4_extent_tree_init(handle_t *, struct inode *);
2726extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
2727 int num,
2728 struct ext4_ext_path *path);
2729extern int ext4_can_extents_be_merged(struct inode *inode,
2730 struct ext4_extent *ex1,
2731 struct ext4_extent *ex2);
2732extern int ext4_ext_insert_extent(handle_t *, struct inode *,
2733 struct ext4_ext_path *,
2734 struct ext4_extent *, int);
2735extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t,
2736 struct ext4_ext_path *,
2737 int flags);
2738extern void ext4_ext_drop_refs(struct ext4_ext_path *);
2739extern int ext4_ext_check_inode(struct inode *inode);
2740extern int ext4_find_delalloc_range(struct inode *inode,
2741 ext4_lblk_t lblk_start,
2742 ext4_lblk_t lblk_end);
2743extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
2744extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2745 __u64 start, __u64 len);
2746extern int ext4_ext_precache(struct inode *inode);
2747extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
2748
2749/* move_extent.c */
2750extern void ext4_double_down_write_data_sem(struct inode *first,
2751 struct inode *second);
2752extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
2753 struct inode *donor_inode);
2754extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2755 __u64 start_orig, __u64 start_donor,
2756 __u64 len, __u64 *moved_len);
2757extern int mext_next_extent(struct inode *inode, struct ext4_ext_path *path,
2758 struct ext4_extent **extent);
2759
2760/* page-io.c */
2761extern int __init ext4_init_pageio(void);
2762extern void ext4_exit_pageio(void);
2763extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2764extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
2765extern int ext4_put_io_end(ext4_io_end_t *io_end);
2766extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
2767extern void ext4_io_submit_init(struct ext4_io_submit *io,
2768 struct writeback_control *wbc);
2769extern void ext4_end_io_rsv_work(struct work_struct *work);
2770extern void ext4_io_submit(struct ext4_io_submit *io);
2771extern int ext4_bio_write_page(struct ext4_io_submit *io,
2772 struct page *page,
2773 int len,
2774 struct writeback_control *wbc);
2775
2776/* mmp.c */
2777extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2778extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp);
2779extern int ext4_mmp_csum_verify(struct super_block *sb,
2780 struct mmp_struct *mmp);
2781
2782/*
2783 * Note that these flags will never ever appear in a buffer_head's state flag.
2784 * See EXT4_MAP_... to see where this is used.
2785 */
2786enum ext4_state_bits {
2787 BH_Uninit /* blocks are allocated but uninitialized on disk */
2788 = BH_JBDPrivateStart,
2789 BH_AllocFromCluster, /* allocated blocks were part of already
2790 * allocated cluster. */
2791};
2792
2793/*
2794 * Add new method to test whether block and inode bitmaps are properly
2795 * initialized. With uninit_bg reading the block from disk is not enough
2796 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2797 */
2798#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2799
2800static inline int bitmap_uptodate(struct buffer_head *bh)
2801{
2802 return (buffer_uptodate(bh) &&
2803 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2804}
2805static inline void set_bitmap_uptodate(struct buffer_head *bh)
2806{
2807 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2808}
2809
2810/*
2811 * Disable DIO read nolock optimization, so new dioreaders will be forced
2812 * to grab i_mutex
2813 */
2814static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
2815{
2816 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2817 smp_mb();
2818}
2819static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
2820{
2821 smp_mb();
2822 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2823}
2824
2825#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2826
2827/* For ioend & aio unwritten conversion wait queues */
2828#define EXT4_WQ_HASH_SZ 37
2829#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2830 EXT4_WQ_HASH_SZ])
2831#define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2832 EXT4_WQ_HASH_SZ])
2833extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2834extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2835
2836#define EXT4_RESIZING 0
2837extern int ext4_resize_begin(struct super_block *sb);
2838extern void ext4_resize_end(struct super_block *sb);
2839
2840#endif /* __KERNEL__ */
2841
2842#endif /* _EXT4_H */