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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#ifdef __KERNEL__
33#include <linux/compat.h>
34#endif
35
36/*
37 * The fourth extended filesystem constants/structures
38 */
39
40/*
41 * Define EXT4FS_DEBUG to produce debug messages
42 */
43#undef EXT4FS_DEBUG
44
45/*
46 * Debug code
47 */
48#ifdef EXT4FS_DEBUG
49#define ext4_debug(f, a...) \
50 do { \
51 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
52 __FILE__, __LINE__, __func__); \
53 printk(KERN_DEBUG f, ## a); \
54 } while (0)
55#else
56#define ext4_debug(f, a...) do {} while (0)
57#endif
58
59#define EXT4_ERROR_INODE(inode, fmt, a...) \
60 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
61
62#define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
63 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
64
65#define EXT4_ERROR_FILE(file, block, fmt, a...) \
66 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
67
68/* data type for block offset of block group */
69typedef int ext4_grpblk_t;
70
71/* data type for filesystem-wide blocks number */
72typedef unsigned long long ext4_fsblk_t;
73
74/* data type for file logical block number */
75typedef __u32 ext4_lblk_t;
76
77/* data type for block group number */
78typedef unsigned int ext4_group_t;
79
80/*
81 * Flags used in mballoc's allocation_context flags field.
82 *
83 * Also used to show what's going on for debugging purposes when the
84 * flag field is exported via the traceport interface
85 */
86
87/* prefer goal again. length */
88#define EXT4_MB_HINT_MERGE 0x0001
89/* blocks already reserved */
90#define EXT4_MB_HINT_RESERVED 0x0002
91/* metadata is being allocated */
92#define EXT4_MB_HINT_METADATA 0x0004
93/* first blocks in the file */
94#define EXT4_MB_HINT_FIRST 0x0008
95/* search for the best chunk */
96#define EXT4_MB_HINT_BEST 0x0010
97/* data is being allocated */
98#define EXT4_MB_HINT_DATA 0x0020
99/* don't preallocate (for tails) */
100#define EXT4_MB_HINT_NOPREALLOC 0x0040
101/* allocate for locality group */
102#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
103/* allocate goal blocks or none */
104#define EXT4_MB_HINT_GOAL_ONLY 0x0100
105/* goal is meaningful */
106#define EXT4_MB_HINT_TRY_GOAL 0x0200
107/* blocks already pre-reserved by delayed allocation */
108#define EXT4_MB_DELALLOC_RESERVED 0x0400
109/* We are doing stream allocation */
110#define EXT4_MB_STREAM_ALLOC 0x0800
111/* Use reserved root blocks if needed */
112#define EXT4_MB_USE_ROOT_BLOCKS 0x1000
113
114struct ext4_allocation_request {
115 /* target inode for block we're allocating */
116 struct inode *inode;
117 /* how many blocks we want to allocate */
118 unsigned int len;
119 /* logical block in target inode */
120 ext4_lblk_t logical;
121 /* the closest logical allocated block to the left */
122 ext4_lblk_t lleft;
123 /* the closest logical allocated block to the right */
124 ext4_lblk_t lright;
125 /* phys. target (a hint) */
126 ext4_fsblk_t goal;
127 /* phys. block for the closest logical allocated block to the left */
128 ext4_fsblk_t pleft;
129 /* phys. block for the closest logical allocated block to the right */
130 ext4_fsblk_t pright;
131 /* flags. see above EXT4_MB_HINT_* */
132 unsigned int flags;
133};
134
135/*
136 * Logical to physical block mapping, used by ext4_map_blocks()
137 *
138 * This structure is used to pass requests into ext4_map_blocks() as
139 * well as to store the information returned by ext4_map_blocks(). It
140 * takes less room on the stack than a struct buffer_head.
141 */
142#define EXT4_MAP_NEW (1 << BH_New)
143#define EXT4_MAP_MAPPED (1 << BH_Mapped)
144#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
145#define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
146#define EXT4_MAP_UNINIT (1 << BH_Uninit)
147#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
148 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
149 EXT4_MAP_UNINIT)
150
151struct ext4_map_blocks {
152 ext4_fsblk_t m_pblk;
153 ext4_lblk_t m_lblk;
154 unsigned int m_len;
155 unsigned int m_flags;
156};
157
158/*
159 * For delayed allocation tracking
160 */
161struct mpage_da_data {
162 struct inode *inode;
163 sector_t b_blocknr; /* start block number of extent */
164 size_t b_size; /* size of extent */
165 unsigned long b_state; /* state of the extent */
166 unsigned long first_page, next_page; /* extent of pages */
167 struct writeback_control *wbc;
168 int io_done;
169 int pages_written;
170 int retval;
171};
172
173/*
174 * Flags for ext4_io_end->flags
175 */
176#define EXT4_IO_END_UNWRITTEN 0x0001
177#define EXT4_IO_END_ERROR 0x0002
178#define EXT4_IO_END_QUEUED 0x0004
179
180struct ext4_io_page {
181 struct page *p_page;
182 atomic_t p_count;
183};
184
185#define MAX_IO_PAGES 128
186
187typedef struct ext4_io_end {
188 struct list_head list; /* per-file finished IO list */
189 struct inode *inode; /* file being written to */
190 unsigned int flag; /* unwritten or not */
191 struct page *page; /* page struct for buffer write */
192 loff_t offset; /* offset in the file */
193 ssize_t size; /* size of the extent */
194 struct work_struct work; /* data work queue */
195 struct kiocb *iocb; /* iocb struct for AIO */
196 int result; /* error value for AIO */
197 int num_io_pages;
198 struct ext4_io_page *pages[MAX_IO_PAGES];
199} ext4_io_end_t;
200
201struct ext4_io_submit {
202 int io_op;
203 struct bio *io_bio;
204 ext4_io_end_t *io_end;
205 struct ext4_io_page *io_page;
206 sector_t io_next_block;
207};
208
209/*
210 * Special inodes numbers
211 */
212#define EXT4_BAD_INO 1 /* Bad blocks inode */
213#define EXT4_ROOT_INO 2 /* Root inode */
214#define EXT4_USR_QUOTA_INO 3 /* User quota inode */
215#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
216#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
217#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
218#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
219#define EXT4_JOURNAL_INO 8 /* Journal inode */
220
221/* First non-reserved inode for old ext4 filesystems */
222#define EXT4_GOOD_OLD_FIRST_INO 11
223
224/*
225 * Maximal count of links to a file
226 */
227#define EXT4_LINK_MAX 65000
228
229/*
230 * Macro-instructions used to manage several block sizes
231 */
232#define EXT4_MIN_BLOCK_SIZE 1024
233#define EXT4_MAX_BLOCK_SIZE 65536
234#define EXT4_MIN_BLOCK_LOG_SIZE 10
235#define EXT4_MAX_BLOCK_LOG_SIZE 16
236#ifdef __KERNEL__
237# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
238#else
239# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
240#endif
241#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
242#ifdef __KERNEL__
243# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
244#else
245# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
246#endif
247#ifdef __KERNEL__
248#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
249#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
250#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
251#else
252#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
253 EXT4_GOOD_OLD_INODE_SIZE : \
254 (s)->s_inode_size)
255#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
256 EXT4_GOOD_OLD_FIRST_INO : \
257 (s)->s_first_ino)
258#endif
259#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
260
261/*
262 * Structure of a blocks group descriptor
263 */
264struct ext4_group_desc
265{
266 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
267 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
268 __le32 bg_inode_table_lo; /* Inodes table block */
269 __le16 bg_free_blocks_count_lo;/* Free blocks count */
270 __le16 bg_free_inodes_count_lo;/* Free inodes count */
271 __le16 bg_used_dirs_count_lo; /* Directories count */
272 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
273 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
274 __le16 bg_itable_unused_lo; /* Unused inodes count */
275 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
276 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
277 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
278 __le32 bg_inode_table_hi; /* Inodes table block MSB */
279 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
280 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
281 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
282 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
283 __u32 bg_reserved2[3];
284};
285
286/*
287 * Structure of a flex block group info
288 */
289
290struct flex_groups {
291 atomic_t free_inodes;
292 atomic_t free_blocks;
293 atomic_t used_dirs;
294};
295
296#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
297#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
298#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
299
300/*
301 * Macro-instructions used to manage group descriptors
302 */
303#define EXT4_MIN_DESC_SIZE 32
304#define EXT4_MIN_DESC_SIZE_64BIT 64
305#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
306#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
307#ifdef __KERNEL__
308# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
309# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
310# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
311# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
312#else
313# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
314# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
315# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
316#endif
317
318/*
319 * Constants relative to the data blocks
320 */
321#define EXT4_NDIR_BLOCKS 12
322#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
323#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
324#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
325#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
326
327/*
328 * Inode flags
329 */
330#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
331#define EXT4_UNRM_FL 0x00000002 /* Undelete */
332#define EXT4_COMPR_FL 0x00000004 /* Compress file */
333#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
334#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
335#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
336#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
337#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
338/* Reserved for compression usage... */
339#define EXT4_DIRTY_FL 0x00000100
340#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
341#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
342#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
343/* End compression flags --- maybe not all used */
344#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
345#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
346#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
347#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
348#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
349#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
350#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
351#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
352#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
353#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
354#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
355
356#define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
357#define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
358
359/* Flags that should be inherited by new inodes from their parent. */
360#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
361 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
362 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
363 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
364 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
365
366/* Flags that are appropriate for regular files (all but dir-specific ones). */
367#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
368
369/* Flags that are appropriate for non-directories/regular files. */
370#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
371
372/* Mask out flags that are inappropriate for the given type of inode. */
373static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
374{
375 if (S_ISDIR(mode))
376 return flags;
377 else if (S_ISREG(mode))
378 return flags & EXT4_REG_FLMASK;
379 else
380 return flags & EXT4_OTHER_FLMASK;
381}
382
383/*
384 * Inode flags used for atomic set/get
385 */
386enum {
387 EXT4_INODE_SECRM = 0, /* Secure deletion */
388 EXT4_INODE_UNRM = 1, /* Undelete */
389 EXT4_INODE_COMPR = 2, /* Compress file */
390 EXT4_INODE_SYNC = 3, /* Synchronous updates */
391 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
392 EXT4_INODE_APPEND = 5, /* writes to file may only append */
393 EXT4_INODE_NODUMP = 6, /* do not dump file */
394 EXT4_INODE_NOATIME = 7, /* do not update atime */
395/* Reserved for compression usage... */
396 EXT4_INODE_DIRTY = 8,
397 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
398 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
399 EXT4_INODE_ECOMPR = 11, /* Compression error */
400/* End compression flags --- maybe not all used */
401 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
402 EXT4_INODE_IMAGIC = 13, /* AFS directory */
403 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
404 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
405 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
406 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
407 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
408 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
409 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
410 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
411 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
412};
413
414#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
415#define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
416 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
417 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
418
419/*
420 * Since it's pretty easy to mix up bit numbers and hex values, and we
421 * can't do a compile-time test for ENUM values, we use a run-time
422 * test to make sure that EXT4_XXX_FL is consistent with respect to
423 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop
424 * out so it won't cost any extra space in the compiled kernel image.
425 * But it's important that these values are the same, since we are
426 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
427 * must be consistent with the values of FS_XXX_FL defined in
428 * include/linux/fs.h and the on-disk values found in ext2, ext3, and
429 * ext4 filesystems, and of course the values defined in e2fsprogs.
430 *
431 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
432 */
433static inline void ext4_check_flag_values(void)
434{
435 CHECK_FLAG_VALUE(SECRM);
436 CHECK_FLAG_VALUE(UNRM);
437 CHECK_FLAG_VALUE(COMPR);
438 CHECK_FLAG_VALUE(SYNC);
439 CHECK_FLAG_VALUE(IMMUTABLE);
440 CHECK_FLAG_VALUE(APPEND);
441 CHECK_FLAG_VALUE(NODUMP);
442 CHECK_FLAG_VALUE(NOATIME);
443 CHECK_FLAG_VALUE(DIRTY);
444 CHECK_FLAG_VALUE(COMPRBLK);
445 CHECK_FLAG_VALUE(NOCOMPR);
446 CHECK_FLAG_VALUE(ECOMPR);
447 CHECK_FLAG_VALUE(INDEX);
448 CHECK_FLAG_VALUE(IMAGIC);
449 CHECK_FLAG_VALUE(JOURNAL_DATA);
450 CHECK_FLAG_VALUE(NOTAIL);
451 CHECK_FLAG_VALUE(DIRSYNC);
452 CHECK_FLAG_VALUE(TOPDIR);
453 CHECK_FLAG_VALUE(HUGE_FILE);
454 CHECK_FLAG_VALUE(EXTENTS);
455 CHECK_FLAG_VALUE(EA_INODE);
456 CHECK_FLAG_VALUE(EOFBLOCKS);
457 CHECK_FLAG_VALUE(RESERVED);
458}
459
460/* Used to pass group descriptor data when online resize is done */
461struct ext4_new_group_input {
462 __u32 group; /* Group number for this data */
463 __u64 block_bitmap; /* Absolute block number of block bitmap */
464 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
465 __u64 inode_table; /* Absolute block number of inode table start */
466 __u32 blocks_count; /* Total number of blocks in this group */
467 __u16 reserved_blocks; /* Number of reserved blocks in this group */
468 __u16 unused;
469};
470
471#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
472struct compat_ext4_new_group_input {
473 u32 group;
474 compat_u64 block_bitmap;
475 compat_u64 inode_bitmap;
476 compat_u64 inode_table;
477 u32 blocks_count;
478 u16 reserved_blocks;
479 u16 unused;
480};
481#endif
482
483/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
484struct ext4_new_group_data {
485 __u32 group;
486 __u64 block_bitmap;
487 __u64 inode_bitmap;
488 __u64 inode_table;
489 __u32 blocks_count;
490 __u16 reserved_blocks;
491 __u16 unused;
492 __u32 free_blocks_count;
493};
494
495/*
496 * Flags used by ext4_map_blocks()
497 */
498 /* Allocate any needed blocks and/or convert an unitialized
499 extent to be an initialized ext4 */
500#define EXT4_GET_BLOCKS_CREATE 0x0001
501 /* Request the creation of an unitialized extent */
502#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
503#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
504 EXT4_GET_BLOCKS_CREATE)
505 /* Caller is from the delayed allocation writeout path,
506 so set the magic i_delalloc_reserve_flag after taking the
507 inode allocation semaphore for */
508#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
509 /* caller is from the direct IO path, request to creation of an
510 unitialized extents if not allocated, split the uninitialized
511 extent if blocks has been preallocated already*/
512#define EXT4_GET_BLOCKS_PRE_IO 0x0008
513#define EXT4_GET_BLOCKS_CONVERT 0x0010
514#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
515 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
516 /* Convert extent to initialized after IO complete */
517#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
518 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
519 /* Punch out blocks of an extent */
520#define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020
521 /* Don't normalize allocation size (used for fallocate) */
522#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
523
524/*
525 * Flags used by ext4_free_blocks
526 */
527#define EXT4_FREE_BLOCKS_METADATA 0x0001
528#define EXT4_FREE_BLOCKS_FORGET 0x0002
529#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
530#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
531
532/*
533 * ioctl commands
534 */
535#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
536#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
537#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
538#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
539#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
540#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
541#ifdef CONFIG_JBD2_DEBUG
542#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
543#endif
544#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
545#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
546#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
547#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
548#define EXT4_IOC_MIGRATE _IO('f', 9)
549 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
550 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
551#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
552#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
553
554#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
555/*
556 * ioctl commands in 32 bit emulation
557 */
558#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
559#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
560#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
561#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
562#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
563#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
564#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
565#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
566#ifdef CONFIG_JBD2_DEBUG
567#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
568#endif
569#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
570#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
571#endif
572
573/* Max physical block we can address w/o extents */
574#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
575
576/*
577 * Structure of an inode on the disk
578 */
579struct ext4_inode {
580 __le16 i_mode; /* File mode */
581 __le16 i_uid; /* Low 16 bits of Owner Uid */
582 __le32 i_size_lo; /* Size in bytes */
583 __le32 i_atime; /* Access time */
584 __le32 i_ctime; /* Inode Change time */
585 __le32 i_mtime; /* Modification time */
586 __le32 i_dtime; /* Deletion Time */
587 __le16 i_gid; /* Low 16 bits of Group Id */
588 __le16 i_links_count; /* Links count */
589 __le32 i_blocks_lo; /* Blocks count */
590 __le32 i_flags; /* File flags */
591 union {
592 struct {
593 __le32 l_i_version;
594 } linux1;
595 struct {
596 __u32 h_i_translator;
597 } hurd1;
598 struct {
599 __u32 m_i_reserved1;
600 } masix1;
601 } osd1; /* OS dependent 1 */
602 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
603 __le32 i_generation; /* File version (for NFS) */
604 __le32 i_file_acl_lo; /* File ACL */
605 __le32 i_size_high;
606 __le32 i_obso_faddr; /* Obsoleted fragment address */
607 union {
608 struct {
609 __le16 l_i_blocks_high; /* were l_i_reserved1 */
610 __le16 l_i_file_acl_high;
611 __le16 l_i_uid_high; /* these 2 fields */
612 __le16 l_i_gid_high; /* were reserved2[0] */
613 __u32 l_i_reserved2;
614 } linux2;
615 struct {
616 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
617 __u16 h_i_mode_high;
618 __u16 h_i_uid_high;
619 __u16 h_i_gid_high;
620 __u32 h_i_author;
621 } hurd2;
622 struct {
623 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
624 __le16 m_i_file_acl_high;
625 __u32 m_i_reserved2[2];
626 } masix2;
627 } osd2; /* OS dependent 2 */
628 __le16 i_extra_isize;
629 __le16 i_pad1;
630 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
631 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
632 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
633 __le32 i_crtime; /* File Creation time */
634 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
635 __le32 i_version_hi; /* high 32 bits for 64-bit version */
636};
637
638struct move_extent {
639 __u32 reserved; /* should be zero */
640 __u32 donor_fd; /* donor file descriptor */
641 __u64 orig_start; /* logical start offset in block for orig */
642 __u64 donor_start; /* logical start offset in block for donor */
643 __u64 len; /* block length to be moved */
644 __u64 moved_len; /* moved block length */
645};
646
647#define EXT4_EPOCH_BITS 2
648#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
649#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
650
651/*
652 * Extended fields will fit into an inode if the filesystem was formatted
653 * with large inodes (-I 256 or larger) and there are not currently any EAs
654 * consuming all of the available space. For new inodes we always reserve
655 * enough space for the kernel's known extended fields, but for inodes
656 * created with an old kernel this might not have been the case. None of
657 * the extended inode fields is critical for correct filesystem operation.
658 * This macro checks if a certain field fits in the inode. Note that
659 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
660 */
661#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
662 ((offsetof(typeof(*ext4_inode), field) + \
663 sizeof((ext4_inode)->field)) \
664 <= (EXT4_GOOD_OLD_INODE_SIZE + \
665 (einode)->i_extra_isize)) \
666
667static inline __le32 ext4_encode_extra_time(struct timespec *time)
668{
669 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
670 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
671 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
672}
673
674static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
675{
676 if (sizeof(time->tv_sec) > 4)
677 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
678 << 32;
679 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
680}
681
682#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
683do { \
684 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
685 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
686 (raw_inode)->xtime ## _extra = \
687 ext4_encode_extra_time(&(inode)->xtime); \
688} while (0)
689
690#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
691do { \
692 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
693 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
694 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
695 (raw_inode)->xtime ## _extra = \
696 ext4_encode_extra_time(&(einode)->xtime); \
697} while (0)
698
699#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
700do { \
701 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
702 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
703 ext4_decode_extra_time(&(inode)->xtime, \
704 raw_inode->xtime ## _extra); \
705 else \
706 (inode)->xtime.tv_nsec = 0; \
707} while (0)
708
709#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
710do { \
711 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
712 (einode)->xtime.tv_sec = \
713 (signed)le32_to_cpu((raw_inode)->xtime); \
714 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
715 ext4_decode_extra_time(&(einode)->xtime, \
716 raw_inode->xtime ## _extra); \
717 else \
718 (einode)->xtime.tv_nsec = 0; \
719} while (0)
720
721#define i_disk_version osd1.linux1.l_i_version
722
723#if defined(__KERNEL__) || defined(__linux__)
724#define i_reserved1 osd1.linux1.l_i_reserved1
725#define i_file_acl_high osd2.linux2.l_i_file_acl_high
726#define i_blocks_high osd2.linux2.l_i_blocks_high
727#define i_uid_low i_uid
728#define i_gid_low i_gid
729#define i_uid_high osd2.linux2.l_i_uid_high
730#define i_gid_high osd2.linux2.l_i_gid_high
731#define i_reserved2 osd2.linux2.l_i_reserved2
732
733#elif defined(__GNU__)
734
735#define i_translator osd1.hurd1.h_i_translator
736#define i_uid_high osd2.hurd2.h_i_uid_high
737#define i_gid_high osd2.hurd2.h_i_gid_high
738#define i_author osd2.hurd2.h_i_author
739
740#elif defined(__masix__)
741
742#define i_reserved1 osd1.masix1.m_i_reserved1
743#define i_file_acl_high osd2.masix2.m_i_file_acl_high
744#define i_reserved2 osd2.masix2.m_i_reserved2
745
746#endif /* defined(__KERNEL__) || defined(__linux__) */
747
748/*
749 * storage for cached extent
750 * If ec_len == 0, then the cache is invalid.
751 * If ec_start == 0, then the cache represents a gap (null mapping)
752 */
753struct ext4_ext_cache {
754 ext4_fsblk_t ec_start;
755 ext4_lblk_t ec_block;
756 __u32 ec_len; /* must be 32bit to return holes */
757};
758
759/*
760 * fourth extended file system inode data in memory
761 */
762struct ext4_inode_info {
763 __le32 i_data[15]; /* unconverted */
764 __u32 i_dtime;
765 ext4_fsblk_t i_file_acl;
766
767 /*
768 * i_block_group is the number of the block group which contains
769 * this file's inode. Constant across the lifetime of the inode,
770 * it is ued for making block allocation decisions - we try to
771 * place a file's data blocks near its inode block, and new inodes
772 * near to their parent directory's inode.
773 */
774 ext4_group_t i_block_group;
775 ext4_lblk_t i_dir_start_lookup;
776#if (BITS_PER_LONG < 64)
777 unsigned long i_state_flags; /* Dynamic state flags */
778#endif
779 unsigned long i_flags;
780
781#ifdef CONFIG_EXT4_FS_XATTR
782 /*
783 * Extended attributes can be read independently of the main file
784 * data. Taking i_mutex even when reading would cause contention
785 * between readers of EAs and writers of regular file data, so
786 * instead we synchronize on xattr_sem when reading or changing
787 * EAs.
788 */
789 struct rw_semaphore xattr_sem;
790#endif
791
792 struct list_head i_orphan; /* unlinked but open inodes */
793
794 /*
795 * i_disksize keeps track of what the inode size is ON DISK, not
796 * in memory. During truncate, i_size is set to the new size by
797 * the VFS prior to calling ext4_truncate(), but the filesystem won't
798 * set i_disksize to 0 until the truncate is actually under way.
799 *
800 * The intent is that i_disksize always represents the blocks which
801 * are used by this file. This allows recovery to restart truncate
802 * on orphans if we crash during truncate. We actually write i_disksize
803 * into the on-disk inode when writing inodes out, instead of i_size.
804 *
805 * The only time when i_disksize and i_size may be different is when
806 * a truncate is in progress. The only things which change i_disksize
807 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
808 */
809 loff_t i_disksize;
810
811 /*
812 * i_data_sem is for serialising ext4_truncate() against
813 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
814 * data tree are chopped off during truncate. We can't do that in
815 * ext4 because whenever we perform intermediate commits during
816 * truncate, the inode and all the metadata blocks *must* be in a
817 * consistent state which allows truncation of the orphans to restart
818 * during recovery. Hence we must fix the get_block-vs-truncate race
819 * by other means, so we have i_data_sem.
820 */
821 struct rw_semaphore i_data_sem;
822 struct inode vfs_inode;
823 struct jbd2_inode *jinode;
824
825 struct ext4_ext_cache i_cached_extent;
826 /*
827 * File creation time. Its function is same as that of
828 * struct timespec i_{a,c,m}time in the generic inode.
829 */
830 struct timespec i_crtime;
831
832 /* mballoc */
833 struct list_head i_prealloc_list;
834 spinlock_t i_prealloc_lock;
835
836 /* ialloc */
837 ext4_group_t i_last_alloc_group;
838
839 /* allocation reservation info for delalloc */
840 unsigned int i_reserved_data_blocks;
841 unsigned int i_reserved_meta_blocks;
842 unsigned int i_allocated_meta_blocks;
843 ext4_lblk_t i_da_metadata_calc_last_lblock;
844 int i_da_metadata_calc_len;
845
846 /* on-disk additional length */
847 __u16 i_extra_isize;
848
849#ifdef CONFIG_QUOTA
850 /* quota space reservation, managed internally by quota code */
851 qsize_t i_reserved_quota;
852#endif
853
854 /* completed IOs that might need unwritten extents handling */
855 struct list_head i_completed_io_list;
856 spinlock_t i_completed_io_lock;
857 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
858 /* current io_end structure for async DIO write*/
859 ext4_io_end_t *cur_aio_dio;
860 atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */
861
862 spinlock_t i_block_reservation_lock;
863
864 /*
865 * Transactions that contain inode's metadata needed to complete
866 * fsync and fdatasync, respectively.
867 */
868 tid_t i_sync_tid;
869 tid_t i_datasync_tid;
870};
871
872/*
873 * File system states
874 */
875#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
876#define EXT4_ERROR_FS 0x0002 /* Errors detected */
877#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
878
879/*
880 * Misc. filesystem flags
881 */
882#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
883#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
884#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
885
886/*
887 * Mount flags
888 */
889#define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
890#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
891#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
892#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
893#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
894#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
895#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
896#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
897#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
898#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
899#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
900#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
901#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
902#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
903#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
904#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
905#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
906#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
907#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
908#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
909#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
910#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
911#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
912#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
913#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
914#define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */
915#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
916#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
917#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
918#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
919#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
920
921#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
922 ~EXT4_MOUNT_##opt
923#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
924 EXT4_MOUNT_##opt
925#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
926 EXT4_MOUNT_##opt)
927
928#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
929 ~EXT4_MOUNT2_##opt
930#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
931 EXT4_MOUNT2_##opt
932#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
933 EXT4_MOUNT2_##opt)
934
935#define ext4_set_bit __test_and_set_bit_le
936#define ext4_set_bit_atomic ext2_set_bit_atomic
937#define ext4_clear_bit __test_and_clear_bit_le
938#define ext4_clear_bit_atomic ext2_clear_bit_atomic
939#define ext4_test_bit test_bit_le
940#define ext4_find_first_zero_bit find_first_zero_bit_le
941#define ext4_find_next_zero_bit find_next_zero_bit_le
942#define ext4_find_next_bit find_next_bit_le
943
944extern void ext4_set_bits(void *bm, int cur, int len);
945
946/*
947 * Maximal mount counts between two filesystem checks
948 */
949#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
950#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
951
952/*
953 * Behaviour when detecting errors
954 */
955#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
956#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
957#define EXT4_ERRORS_PANIC 3 /* Panic */
958#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
959
960/*
961 * Structure of the super block
962 */
963struct ext4_super_block {
964/*00*/ __le32 s_inodes_count; /* Inodes count */
965 __le32 s_blocks_count_lo; /* Blocks count */
966 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
967 __le32 s_free_blocks_count_lo; /* Free blocks count */
968/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
969 __le32 s_first_data_block; /* First Data Block */
970 __le32 s_log_block_size; /* Block size */
971 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
972/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
973 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
974 __le32 s_inodes_per_group; /* # Inodes per group */
975 __le32 s_mtime; /* Mount time */
976/*30*/ __le32 s_wtime; /* Write time */
977 __le16 s_mnt_count; /* Mount count */
978 __le16 s_max_mnt_count; /* Maximal mount count */
979 __le16 s_magic; /* Magic signature */
980 __le16 s_state; /* File system state */
981 __le16 s_errors; /* Behaviour when detecting errors */
982 __le16 s_minor_rev_level; /* minor revision level */
983/*40*/ __le32 s_lastcheck; /* time of last check */
984 __le32 s_checkinterval; /* max. time between checks */
985 __le32 s_creator_os; /* OS */
986 __le32 s_rev_level; /* Revision level */
987/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
988 __le16 s_def_resgid; /* Default gid for reserved blocks */
989 /*
990 * These fields are for EXT4_DYNAMIC_REV superblocks only.
991 *
992 * Note: the difference between the compatible feature set and
993 * the incompatible feature set is that if there is a bit set
994 * in the incompatible feature set that the kernel doesn't
995 * know about, it should refuse to mount the filesystem.
996 *
997 * e2fsck's requirements are more strict; if it doesn't know
998 * about a feature in either the compatible or incompatible
999 * feature set, it must abort and not try to meddle with
1000 * things it doesn't understand...
1001 */
1002 __le32 s_first_ino; /* First non-reserved inode */
1003 __le16 s_inode_size; /* size of inode structure */
1004 __le16 s_block_group_nr; /* block group # of this superblock */
1005 __le32 s_feature_compat; /* compatible feature set */
1006/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1007 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1008/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1009/*78*/ char s_volume_name[16]; /* volume name */
1010/*88*/ char s_last_mounted[64]; /* directory where last mounted */
1011/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1012 /*
1013 * Performance hints. Directory preallocation should only
1014 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1015 */
1016 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1017 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1018 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1019 /*
1020 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1021 */
1022/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1023/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1024 __le32 s_journal_dev; /* device number of journal file */
1025 __le32 s_last_orphan; /* start of list of inodes to delete */
1026 __le32 s_hash_seed[4]; /* HTREE hash seed */
1027 __u8 s_def_hash_version; /* Default hash version to use */
1028 __u8 s_jnl_backup_type;
1029 __le16 s_desc_size; /* size of group descriptor */
1030/*100*/ __le32 s_default_mount_opts;
1031 __le32 s_first_meta_bg; /* First metablock block group */
1032 __le32 s_mkfs_time; /* When the filesystem was created */
1033 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1034 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1035/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1036 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1037 __le32 s_free_blocks_count_hi; /* Free blocks count */
1038 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1039 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1040 __le32 s_flags; /* Miscellaneous flags */
1041 __le16 s_raid_stride; /* RAID stride */
1042 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1043 __le64 s_mmp_block; /* Block for multi-mount protection */
1044 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1045 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1046 __u8 s_reserved_char_pad;
1047 __le16 s_reserved_pad;
1048 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1049 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1050 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1051 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1052 snapshot's future use */
1053 __le32 s_snapshot_list; /* inode number of the head of the
1054 on-disk snapshot list */
1055#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1056 __le32 s_error_count; /* number of fs errors */
1057 __le32 s_first_error_time; /* first time an error happened */
1058 __le32 s_first_error_ino; /* inode involved in first error */
1059 __le64 s_first_error_block; /* block involved of first error */
1060 __u8 s_first_error_func[32]; /* function where the error happened */
1061 __le32 s_first_error_line; /* line number where error happened */
1062 __le32 s_last_error_time; /* most recent time of an error */
1063 __le32 s_last_error_ino; /* inode involved in last error */
1064 __le32 s_last_error_line; /* line number where error happened */
1065 __le64 s_last_error_block; /* block involved of last error */
1066 __u8 s_last_error_func[32]; /* function where the error happened */
1067#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1068 __u8 s_mount_opts[64];
1069 __le32 s_reserved[112]; /* Padding to the end of the block */
1070};
1071
1072#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1073
1074#ifdef __KERNEL__
1075
1076/*
1077 * run-time mount flags
1078 */
1079#define EXT4_MF_MNTDIR_SAMPLED 0x0001
1080#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1081
1082/*
1083 * fourth extended-fs super-block data in memory
1084 */
1085struct ext4_sb_info {
1086 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1087 unsigned long s_inodes_per_block;/* Number of inodes per block */
1088 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1089 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1090 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1091 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1092 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1093 ext4_group_t s_groups_count; /* Number of groups in the fs */
1094 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1095 unsigned long s_overhead_last; /* Last calculated overhead */
1096 unsigned long s_blocks_last; /* Last seen block count */
1097 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1098 struct buffer_head * s_sbh; /* Buffer containing the super block */
1099 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1100 struct buffer_head **s_group_desc;
1101 unsigned int s_mount_opt;
1102 unsigned int s_mount_opt2;
1103 unsigned int s_mount_flags;
1104 ext4_fsblk_t s_sb_block;
1105 uid_t s_resuid;
1106 gid_t s_resgid;
1107 unsigned short s_mount_state;
1108 unsigned short s_pad;
1109 int s_addr_per_block_bits;
1110 int s_desc_per_block_bits;
1111 int s_inode_size;
1112 int s_first_ino;
1113 unsigned int s_inode_readahead_blks;
1114 unsigned int s_inode_goal;
1115 spinlock_t s_next_gen_lock;
1116 u32 s_next_generation;
1117 u32 s_hash_seed[4];
1118 int s_def_hash_version;
1119 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1120 struct percpu_counter s_freeblocks_counter;
1121 struct percpu_counter s_freeinodes_counter;
1122 struct percpu_counter s_dirs_counter;
1123 struct percpu_counter s_dirtyblocks_counter;
1124 struct blockgroup_lock *s_blockgroup_lock;
1125 struct proc_dir_entry *s_proc;
1126 struct kobject s_kobj;
1127 struct completion s_kobj_unregister;
1128
1129 /* Journaling */
1130 struct journal_s *s_journal;
1131 struct list_head s_orphan;
1132 struct mutex s_orphan_lock;
1133 unsigned long s_resize_flags; /* Flags indicating if there
1134 is a resizer */
1135 unsigned long s_commit_interval;
1136 u32 s_max_batch_time;
1137 u32 s_min_batch_time;
1138 struct block_device *journal_bdev;
1139#ifdef CONFIG_JBD2_DEBUG
1140 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
1141 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
1142#endif
1143#ifdef CONFIG_QUOTA
1144 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1145 int s_jquota_fmt; /* Format of quota to use */
1146#endif
1147 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1148 struct rb_root system_blks;
1149
1150#ifdef EXTENTS_STATS
1151 /* ext4 extents stats */
1152 unsigned long s_ext_min;
1153 unsigned long s_ext_max;
1154 unsigned long s_depth_max;
1155 spinlock_t s_ext_stats_lock;
1156 unsigned long s_ext_blocks;
1157 unsigned long s_ext_extents;
1158#endif
1159 /* ext4 extent cache stats */
1160 unsigned long extent_cache_hits;
1161 unsigned long extent_cache_misses;
1162
1163 /* for buddy allocator */
1164 struct ext4_group_info ***s_group_info;
1165 struct inode *s_buddy_cache;
1166 spinlock_t s_md_lock;
1167 unsigned short *s_mb_offsets;
1168 unsigned int *s_mb_maxs;
1169
1170 /* tunables */
1171 unsigned long s_stripe;
1172 unsigned int s_mb_stream_request;
1173 unsigned int s_mb_max_to_scan;
1174 unsigned int s_mb_min_to_scan;
1175 unsigned int s_mb_stats;
1176 unsigned int s_mb_order2_reqs;
1177 unsigned int s_mb_group_prealloc;
1178 unsigned int s_max_writeback_mb_bump;
1179 /* where last allocation was done - for stream allocation */
1180 unsigned long s_mb_last_group;
1181 unsigned long s_mb_last_start;
1182
1183 /* stats for buddy allocator */
1184 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1185 atomic_t s_bal_success; /* we found long enough chunks */
1186 atomic_t s_bal_allocated; /* in blocks */
1187 atomic_t s_bal_ex_scanned; /* total extents scanned */
1188 atomic_t s_bal_goals; /* goal hits */
1189 atomic_t s_bal_breaks; /* too long searches */
1190 atomic_t s_bal_2orders; /* 2^order hits */
1191 spinlock_t s_bal_lock;
1192 unsigned long s_mb_buddies_generated;
1193 unsigned long long s_mb_generation_time;
1194 atomic_t s_mb_lost_chunks;
1195 atomic_t s_mb_preallocated;
1196 atomic_t s_mb_discarded;
1197 atomic_t s_lock_busy;
1198
1199 /* locality groups */
1200 struct ext4_locality_group __percpu *s_locality_groups;
1201
1202 /* for write statistics */
1203 unsigned long s_sectors_written_start;
1204 u64 s_kbytes_written;
1205
1206 unsigned int s_log_groups_per_flex;
1207 struct flex_groups *s_flex_groups;
1208
1209 /* workqueue for dio unwritten */
1210 struct workqueue_struct *dio_unwritten_wq;
1211
1212 /* timer for periodic error stats printing */
1213 struct timer_list s_err_report;
1214
1215 /* Lazy inode table initialization info */
1216 struct ext4_li_request *s_li_request;
1217 /* Wait multiplier for lazy initialization thread */
1218 unsigned int s_li_wait_mult;
1219
1220 /* Kernel thread for multiple mount protection */
1221 struct task_struct *s_mmp_tsk;
1222
1223 /* record the last minlen when FITRIM is called. */
1224 atomic_t s_last_trim_minblks;
1225};
1226
1227static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1228{
1229 return sb->s_fs_info;
1230}
1231static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1232{
1233 return container_of(inode, struct ext4_inode_info, vfs_inode);
1234}
1235
1236static inline struct timespec ext4_current_time(struct inode *inode)
1237{
1238 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1239 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1240}
1241
1242static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1243{
1244 return ino == EXT4_ROOT_INO ||
1245 ino == EXT4_JOURNAL_INO ||
1246 ino == EXT4_RESIZE_INO ||
1247 (ino >= EXT4_FIRST_INO(sb) &&
1248 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1249}
1250
1251/*
1252 * Inode dynamic state flags
1253 */
1254enum {
1255 EXT4_STATE_JDATA, /* journaled data exists */
1256 EXT4_STATE_NEW, /* inode is newly created */
1257 EXT4_STATE_XATTR, /* has in-inode xattrs */
1258 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1259 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1260 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1261 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1262 EXT4_STATE_NEWENTRY, /* File just added to dir */
1263 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
1264};
1265
1266#define EXT4_INODE_BIT_FNS(name, field, offset) \
1267static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1268{ \
1269 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1270} \
1271static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1272{ \
1273 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1274} \
1275static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1276{ \
1277 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1278}
1279
1280EXT4_INODE_BIT_FNS(flag, flags, 0)
1281#if (BITS_PER_LONG < 64)
1282EXT4_INODE_BIT_FNS(state, state_flags, 0)
1283
1284static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1285{
1286 (ei)->i_state_flags = 0;
1287}
1288#else
1289EXT4_INODE_BIT_FNS(state, flags, 32)
1290
1291static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1292{
1293 /* We depend on the fact that callers will set i_flags */
1294}
1295#endif
1296#else
1297/* Assume that user mode programs are passing in an ext4fs superblock, not
1298 * a kernel struct super_block. This will allow us to call the feature-test
1299 * macros from user land. */
1300#define EXT4_SB(sb) (sb)
1301#endif
1302
1303#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1304
1305/*
1306 * Codes for operating systems
1307 */
1308#define EXT4_OS_LINUX 0
1309#define EXT4_OS_HURD 1
1310#define EXT4_OS_MASIX 2
1311#define EXT4_OS_FREEBSD 3
1312#define EXT4_OS_LITES 4
1313
1314/*
1315 * Revision levels
1316 */
1317#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1318#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1319
1320#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1321#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1322
1323#define EXT4_GOOD_OLD_INODE_SIZE 128
1324
1325/*
1326 * Feature set definitions
1327 */
1328
1329#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1330 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1331#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1332 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1333#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1334 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1335#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1336 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1337#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1338 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1339#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1340 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1341#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1342 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1343#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1344 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1345#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1346 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1347
1348#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1349#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1350#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1351#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1352#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1353#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1354
1355#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1356#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1357#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1358#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1359#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1360#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1361#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1362#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1363
1364#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1365#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1366#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1367#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1368#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1369#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1370#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1371#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1372#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1373#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1374#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1375
1376#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1377#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1378 EXT4_FEATURE_INCOMPAT_META_BG)
1379#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1380 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1381 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1382
1383#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1384#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1385 EXT4_FEATURE_INCOMPAT_RECOVER| \
1386 EXT4_FEATURE_INCOMPAT_META_BG)
1387#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1388 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1389 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1390
1391#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1392#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1393 EXT4_FEATURE_INCOMPAT_RECOVER| \
1394 EXT4_FEATURE_INCOMPAT_META_BG| \
1395 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1396 EXT4_FEATURE_INCOMPAT_64BIT| \
1397 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1398 EXT4_FEATURE_INCOMPAT_MMP)
1399#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1400 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1401 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1402 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1403 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1404 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1405 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
1406
1407/*
1408 * Default values for user and/or group using reserved blocks
1409 */
1410#define EXT4_DEF_RESUID 0
1411#define EXT4_DEF_RESGID 0
1412
1413#define EXT4_DEF_INODE_READAHEAD_BLKS 32
1414
1415/*
1416 * Default mount options
1417 */
1418#define EXT4_DEFM_DEBUG 0x0001
1419#define EXT4_DEFM_BSDGROUPS 0x0002
1420#define EXT4_DEFM_XATTR_USER 0x0004
1421#define EXT4_DEFM_ACL 0x0008
1422#define EXT4_DEFM_UID16 0x0010
1423#define EXT4_DEFM_JMODE 0x0060
1424#define EXT4_DEFM_JMODE_DATA 0x0020
1425#define EXT4_DEFM_JMODE_ORDERED 0x0040
1426#define EXT4_DEFM_JMODE_WBACK 0x0060
1427#define EXT4_DEFM_NOBARRIER 0x0100
1428#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1429#define EXT4_DEFM_DISCARD 0x0400
1430#define EXT4_DEFM_NODELALLOC 0x0800
1431
1432/*
1433 * Default journal batch times
1434 */
1435#define EXT4_DEF_MIN_BATCH_TIME 0
1436#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1437
1438/*
1439 * Minimum number of groups in a flexgroup before we separate out
1440 * directories into the first block group of a flexgroup
1441 */
1442#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1443
1444/*
1445 * Structure of a directory entry
1446 */
1447#define EXT4_NAME_LEN 255
1448
1449struct ext4_dir_entry {
1450 __le32 inode; /* Inode number */
1451 __le16 rec_len; /* Directory entry length */
1452 __le16 name_len; /* Name length */
1453 char name[EXT4_NAME_LEN]; /* File name */
1454};
1455
1456/*
1457 * The new version of the directory entry. Since EXT4 structures are
1458 * stored in intel byte order, and the name_len field could never be
1459 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1460 * file_type field.
1461 */
1462struct ext4_dir_entry_2 {
1463 __le32 inode; /* Inode number */
1464 __le16 rec_len; /* Directory entry length */
1465 __u8 name_len; /* Name length */
1466 __u8 file_type;
1467 char name[EXT4_NAME_LEN]; /* File name */
1468};
1469
1470/*
1471 * Ext4 directory file types. Only the low 3 bits are used. The
1472 * other bits are reserved for now.
1473 */
1474#define EXT4_FT_UNKNOWN 0
1475#define EXT4_FT_REG_FILE 1
1476#define EXT4_FT_DIR 2
1477#define EXT4_FT_CHRDEV 3
1478#define EXT4_FT_BLKDEV 4
1479#define EXT4_FT_FIFO 5
1480#define EXT4_FT_SOCK 6
1481#define EXT4_FT_SYMLINK 7
1482
1483#define EXT4_FT_MAX 8
1484
1485/*
1486 * EXT4_DIR_PAD defines the directory entries boundaries
1487 *
1488 * NOTE: It must be a multiple of 4
1489 */
1490#define EXT4_DIR_PAD 4
1491#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1492#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1493 ~EXT4_DIR_ROUND)
1494#define EXT4_MAX_REC_LEN ((1<<16)-1)
1495
1496/*
1497 * If we ever get support for fs block sizes > page_size, we'll need
1498 * to remove the #if statements in the next two functions...
1499 */
1500static inline unsigned int
1501ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1502{
1503 unsigned len = le16_to_cpu(dlen);
1504
1505#if (PAGE_CACHE_SIZE >= 65536)
1506 if (len == EXT4_MAX_REC_LEN || len == 0)
1507 return blocksize;
1508 return (len & 65532) | ((len & 3) << 16);
1509#else
1510 return len;
1511#endif
1512}
1513
1514static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1515{
1516 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1517 BUG();
1518#if (PAGE_CACHE_SIZE >= 65536)
1519 if (len < 65536)
1520 return cpu_to_le16(len);
1521 if (len == blocksize) {
1522 if (blocksize == 65536)
1523 return cpu_to_le16(EXT4_MAX_REC_LEN);
1524 else
1525 return cpu_to_le16(0);
1526 }
1527 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1528#else
1529 return cpu_to_le16(len);
1530#endif
1531}
1532
1533/*
1534 * Hash Tree Directory indexing
1535 * (c) Daniel Phillips, 2001
1536 */
1537
1538#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1539 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1540 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1541#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1542#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1543
1544/* Legal values for the dx_root hash_version field: */
1545
1546#define DX_HASH_LEGACY 0
1547#define DX_HASH_HALF_MD4 1
1548#define DX_HASH_TEA 2
1549#define DX_HASH_LEGACY_UNSIGNED 3
1550#define DX_HASH_HALF_MD4_UNSIGNED 4
1551#define DX_HASH_TEA_UNSIGNED 5
1552
1553#ifdef __KERNEL__
1554
1555/* hash info structure used by the directory hash */
1556struct dx_hash_info
1557{
1558 u32 hash;
1559 u32 minor_hash;
1560 int hash_version;
1561 u32 *seed;
1562};
1563
1564#define EXT4_HTREE_EOF 0x7fffffff
1565
1566/*
1567 * Control parameters used by ext4_htree_next_block
1568 */
1569#define HASH_NB_ALWAYS 1
1570
1571
1572/*
1573 * Describe an inode's exact location on disk and in memory
1574 */
1575struct ext4_iloc
1576{
1577 struct buffer_head *bh;
1578 unsigned long offset;
1579 ext4_group_t block_group;
1580};
1581
1582static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1583{
1584 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1585}
1586
1587/*
1588 * This structure is stuffed into the struct file's private_data field
1589 * for directories. It is where we put information so that we can do
1590 * readdir operations in hash tree order.
1591 */
1592struct dir_private_info {
1593 struct rb_root root;
1594 struct rb_node *curr_node;
1595 struct fname *extra_fname;
1596 loff_t last_pos;
1597 __u32 curr_hash;
1598 __u32 curr_minor_hash;
1599 __u32 next_hash;
1600};
1601
1602/* calculate the first block number of the group */
1603static inline ext4_fsblk_t
1604ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1605{
1606 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1607 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1608}
1609
1610/*
1611 * Special error return code only used by dx_probe() and its callers.
1612 */
1613#define ERR_BAD_DX_DIR -75000
1614
1615void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1616 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1617
1618/*
1619 * Timeout and state flag for lazy initialization inode thread.
1620 */
1621#define EXT4_DEF_LI_WAIT_MULT 10
1622#define EXT4_DEF_LI_MAX_START_DELAY 5
1623#define EXT4_LAZYINIT_QUIT 0x0001
1624#define EXT4_LAZYINIT_RUNNING 0x0002
1625
1626/*
1627 * Lazy inode table initialization info
1628 */
1629struct ext4_lazy_init {
1630 unsigned long li_state;
1631 struct list_head li_request_list;
1632 struct mutex li_list_mtx;
1633};
1634
1635struct ext4_li_request {
1636 struct super_block *lr_super;
1637 struct ext4_sb_info *lr_sbi;
1638 ext4_group_t lr_next_group;
1639 struct list_head lr_request;
1640 unsigned long lr_next_sched;
1641 unsigned long lr_timeout;
1642};
1643
1644struct ext4_features {
1645 struct kobject f_kobj;
1646 struct completion f_kobj_unregister;
1647};
1648
1649/*
1650 * This structure will be used for multiple mount protection. It will be
1651 * written into the block number saved in the s_mmp_block field in the
1652 * superblock. Programs that check MMP should assume that if
1653 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1654 * to use the filesystem, regardless of how old the timestamp is.
1655 */
1656#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1657#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1658#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1659#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1660
1661struct mmp_struct {
1662 __le32 mmp_magic; /* Magic number for MMP */
1663 __le32 mmp_seq; /* Sequence no. updated periodically */
1664
1665 /*
1666 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1667 * purposes and do not affect the correctness of the algorithm
1668 */
1669 __le64 mmp_time; /* Time last updated */
1670 char mmp_nodename[64]; /* Node which last updated MMP block */
1671 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1672
1673 /*
1674 * mmp_check_interval is used to verify if the MMP block has been
1675 * updated on the block device. The value is updated based on the
1676 * maximum time to write the MMP block during an update cycle.
1677 */
1678 __le16 mmp_check_interval;
1679
1680 __le16 mmp_pad1;
1681 __le32 mmp_pad2[227];
1682};
1683
1684/* arguments passed to the mmp thread */
1685struct mmpd_data {
1686 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1687 struct super_block *sb; /* super block of the fs */
1688};
1689
1690/*
1691 * Check interval multiplier
1692 * The MMP block is written every update interval and initially checked every
1693 * update interval x the multiplier (the value is then adapted based on the
1694 * write latency). The reason is that writes can be delayed under load and we
1695 * don't want readers to incorrectly assume that the filesystem is no longer
1696 * in use.
1697 */
1698#define EXT4_MMP_CHECK_MULT 2UL
1699
1700/*
1701 * Minimum interval for MMP checking in seconds.
1702 */
1703#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1704
1705/*
1706 * Maximum interval for MMP checking in seconds.
1707 */
1708#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1709
1710/*
1711 * Function prototypes
1712 */
1713
1714/*
1715 * Ok, these declarations are also in <linux/kernel.h> but none of the
1716 * ext4 source programs needs to include it so they are duplicated here.
1717 */
1718# define NORET_TYPE /**/
1719# define ATTRIB_NORET __attribute__((noreturn))
1720# define NORET_AND noreturn,
1721
1722/* bitmap.c */
1723extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1724
1725/* balloc.c */
1726extern unsigned int ext4_block_group(struct super_block *sb,
1727 ext4_fsblk_t blocknr);
1728extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1729 ext4_fsblk_t blocknr);
1730extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1731extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1732 ext4_group_t group);
1733extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1734 ext4_fsblk_t goal,
1735 unsigned int flags,
1736 unsigned long *count,
1737 int *errp);
1738extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
1739 s64 nblocks, unsigned int flags);
1740extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1741extern void ext4_check_blocks_bitmap(struct super_block *);
1742extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1743 ext4_group_t block_group,
1744 struct buffer_head ** bh);
1745extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1746struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1747 ext4_group_t block_group);
1748extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1749 struct buffer_head *bh,
1750 ext4_group_t group,
1751 struct ext4_group_desc *desc);
1752#define ext4_free_blocks_after_init(sb, group, desc) \
1753 ext4_init_block_bitmap(sb, NULL, group, desc)
1754ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
1755
1756/* dir.c */
1757extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1758 struct file *,
1759 struct ext4_dir_entry_2 *,
1760 struct buffer_head *, unsigned int);
1761#define ext4_check_dir_entry(dir, filp, de, bh, offset) \
1762 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1763 (de), (bh), (offset)))
1764extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1765 __u32 minor_hash,
1766 struct ext4_dir_entry_2 *dirent);
1767extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1768
1769/* fsync.c */
1770extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
1771extern int ext4_flush_completed_IO(struct inode *);
1772
1773/* hash.c */
1774extern int ext4fs_dirhash(const char *name, int len, struct
1775 dx_hash_info *hinfo);
1776
1777/* ialloc.c */
1778extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
1779 const struct qstr *qstr, __u32 goal);
1780extern void ext4_free_inode(handle_t *, struct inode *);
1781extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1782extern unsigned long ext4_count_free_inodes(struct super_block *);
1783extern unsigned long ext4_count_dirs(struct super_block *);
1784extern void ext4_check_inodes_bitmap(struct super_block *);
1785extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1786extern int ext4_init_inode_table(struct super_block *sb,
1787 ext4_group_t group, int barrier);
1788
1789/* mballoc.c */
1790extern long ext4_mb_stats;
1791extern long ext4_mb_max_to_scan;
1792extern int ext4_mb_init(struct super_block *, int);
1793extern int ext4_mb_release(struct super_block *);
1794extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1795 struct ext4_allocation_request *, int *);
1796extern int ext4_mb_reserve_blocks(struct super_block *, int);
1797extern void ext4_discard_preallocations(struct inode *);
1798extern int __init ext4_init_mballoc(void);
1799extern void ext4_exit_mballoc(void);
1800extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1801 struct buffer_head *bh, ext4_fsblk_t block,
1802 unsigned long count, int flags);
1803extern int ext4_mb_add_groupinfo(struct super_block *sb,
1804 ext4_group_t i, struct ext4_group_desc *desc);
1805extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
1806 ext4_fsblk_t block, unsigned long count);
1807extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
1808
1809/* inode.c */
1810struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1811 ext4_lblk_t, int, int *);
1812struct buffer_head *ext4_bread(handle_t *, struct inode *,
1813 ext4_lblk_t, int, int *);
1814int ext4_get_block(struct inode *inode, sector_t iblock,
1815 struct buffer_head *bh_result, int create);
1816
1817extern struct inode *ext4_iget(struct super_block *, unsigned long);
1818extern int ext4_write_inode(struct inode *, struct writeback_control *);
1819extern int ext4_setattr(struct dentry *, struct iattr *);
1820extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1821 struct kstat *stat);
1822extern void ext4_evict_inode(struct inode *);
1823extern void ext4_clear_inode(struct inode *);
1824extern int ext4_sync_inode(handle_t *, struct inode *);
1825extern void ext4_dirty_inode(struct inode *, int);
1826extern int ext4_change_inode_journal_flag(struct inode *, int);
1827extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1828extern int ext4_can_truncate(struct inode *inode);
1829extern void ext4_truncate(struct inode *);
1830extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
1831extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1832extern void ext4_set_inode_flags(struct inode *);
1833extern void ext4_get_inode_flags(struct ext4_inode_info *);
1834extern int ext4_alloc_da_blocks(struct inode *inode);
1835extern void ext4_set_aops(struct inode *inode);
1836extern int ext4_writepage_trans_blocks(struct inode *);
1837extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1838extern int ext4_block_truncate_page(handle_t *handle,
1839 struct address_space *mapping, loff_t from);
1840extern int ext4_block_zero_page_range(handle_t *handle,
1841 struct address_space *mapping, loff_t from, loff_t length);
1842extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1843extern qsize_t *ext4_get_reserved_space(struct inode *inode);
1844extern void ext4_da_update_reserve_space(struct inode *inode,
1845 int used, int quota_claim);
1846
1847/* indirect.c */
1848extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
1849 struct ext4_map_blocks *map, int flags);
1850extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
1851 const struct iovec *iov, loff_t offset,
1852 unsigned long nr_segs);
1853extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
1854extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
1855extern void ext4_ind_truncate(struct inode *inode);
1856
1857/* ioctl.c */
1858extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1859extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1860
1861/* migrate.c */
1862extern int ext4_ext_migrate(struct inode *);
1863
1864/* namei.c */
1865extern int ext4_orphan_add(handle_t *, struct inode *);
1866extern int ext4_orphan_del(handle_t *, struct inode *);
1867extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1868 __u32 start_minor_hash, __u32 *next_hash);
1869
1870/* resize.c */
1871extern int ext4_group_add(struct super_block *sb,
1872 struct ext4_new_group_data *input);
1873extern int ext4_group_extend(struct super_block *sb,
1874 struct ext4_super_block *es,
1875 ext4_fsblk_t n_blocks_count);
1876
1877/* super.c */
1878extern void *ext4_kvmalloc(size_t size, gfp_t flags);
1879extern void *ext4_kvzalloc(size_t size, gfp_t flags);
1880extern void ext4_kvfree(void *ptr);
1881extern void __ext4_error(struct super_block *, const char *, unsigned int,
1882 const char *, ...)
1883 __attribute__ ((format (printf, 4, 5)));
1884#define ext4_error(sb, message...) __ext4_error(sb, __func__, \
1885 __LINE__, ## message)
1886extern void ext4_error_inode(struct inode *, const char *, unsigned int,
1887 ext4_fsblk_t, const char *, ...)
1888 __attribute__ ((format (printf, 5, 6)));
1889extern void ext4_error_file(struct file *, const char *, unsigned int,
1890 ext4_fsblk_t, const char *, ...)
1891 __attribute__ ((format (printf, 5, 6)));
1892extern void __ext4_std_error(struct super_block *, const char *,
1893 unsigned int, int);
1894extern void __ext4_abort(struct super_block *, const char *, unsigned int,
1895 const char *, ...)
1896 __attribute__ ((format (printf, 4, 5)));
1897#define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
1898 __LINE__, ## message)
1899extern void __ext4_warning(struct super_block *, const char *, unsigned int,
1900 const char *, ...)
1901 __attribute__ ((format (printf, 4, 5)));
1902#define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
1903 __LINE__, ## message)
1904extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1905 __attribute__ ((format (printf, 3, 4)));
1906extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
1907 const char *, unsigned int, const char *);
1908#define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \
1909 __LINE__, msg)
1910extern void __ext4_grp_locked_error(const char *, unsigned int, \
1911 struct super_block *, ext4_group_t, \
1912 unsigned long, ext4_fsblk_t, \
1913 const char *, ...)
1914 __attribute__ ((format (printf, 7, 8)));
1915#define ext4_grp_locked_error(sb, grp, message...) \
1916 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
1917extern void ext4_update_dynamic_rev(struct super_block *sb);
1918extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1919 __u32 compat);
1920extern int ext4_update_rocompat_feature(handle_t *handle,
1921 struct super_block *sb, __u32 rocompat);
1922extern int ext4_update_incompat_feature(handle_t *handle,
1923 struct super_block *sb, __u32 incompat);
1924extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1925 struct ext4_group_desc *bg);
1926extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1927 struct ext4_group_desc *bg);
1928extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1929 struct ext4_group_desc *bg);
1930extern __u32 ext4_free_blks_count(struct super_block *sb,
1931 struct ext4_group_desc *bg);
1932extern __u32 ext4_free_inodes_count(struct super_block *sb,
1933 struct ext4_group_desc *bg);
1934extern __u32 ext4_used_dirs_count(struct super_block *sb,
1935 struct ext4_group_desc *bg);
1936extern __u32 ext4_itable_unused_count(struct super_block *sb,
1937 struct ext4_group_desc *bg);
1938extern void ext4_block_bitmap_set(struct super_block *sb,
1939 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1940extern void ext4_inode_bitmap_set(struct super_block *sb,
1941 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1942extern void ext4_inode_table_set(struct super_block *sb,
1943 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1944extern void ext4_free_blks_set(struct super_block *sb,
1945 struct ext4_group_desc *bg, __u32 count);
1946extern void ext4_free_inodes_set(struct super_block *sb,
1947 struct ext4_group_desc *bg, __u32 count);
1948extern void ext4_used_dirs_set(struct super_block *sb,
1949 struct ext4_group_desc *bg, __u32 count);
1950extern void ext4_itable_unused_set(struct super_block *sb,
1951 struct ext4_group_desc *bg, __u32 count);
1952extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1953 struct ext4_group_desc *gdp);
1954extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1955 struct ext4_group_desc *gdp);
1956
1957static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1958{
1959 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1960 le32_to_cpu(es->s_blocks_count_lo);
1961}
1962
1963static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1964{
1965 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1966 le32_to_cpu(es->s_r_blocks_count_lo);
1967}
1968
1969static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1970{
1971 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1972 le32_to_cpu(es->s_free_blocks_count_lo);
1973}
1974
1975static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1976 ext4_fsblk_t blk)
1977{
1978 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1979 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1980}
1981
1982static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1983 ext4_fsblk_t blk)
1984{
1985 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1986 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1987}
1988
1989static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1990 ext4_fsblk_t blk)
1991{
1992 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1993 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1994}
1995
1996static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1997{
1998 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1999 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2000 le32_to_cpu(raw_inode->i_size_lo);
2001 else
2002 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2003}
2004
2005static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2006{
2007 raw_inode->i_size_lo = cpu_to_le32(i_size);
2008 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2009}
2010
2011static inline
2012struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2013 ext4_group_t group)
2014{
2015 struct ext4_group_info ***grp_info;
2016 long indexv, indexh;
2017 grp_info = EXT4_SB(sb)->s_group_info;
2018 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2019 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2020 return grp_info[indexv][indexh];
2021}
2022
2023/*
2024 * Reading s_groups_count requires using smp_rmb() afterwards. See
2025 * the locking protocol documented in the comments of ext4_group_add()
2026 * in resize.c
2027 */
2028static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2029{
2030 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2031
2032 smp_rmb();
2033 return ngroups;
2034}
2035
2036static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2037 ext4_group_t block_group)
2038{
2039 return block_group >> sbi->s_log_groups_per_flex;
2040}
2041
2042static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2043{
2044 return 1 << sbi->s_log_groups_per_flex;
2045}
2046
2047#define ext4_std_error(sb, errno) \
2048do { \
2049 if ((errno)) \
2050 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2051} while (0)
2052
2053#ifdef CONFIG_SMP
2054/* Each CPU can accumulate percpu_counter_batch blocks in their local
2055 * counters. So we need to make sure we have free blocks more
2056 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2057 */
2058#define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2059#else
2060#define EXT4_FREEBLOCKS_WATERMARK 0
2061#endif
2062
2063static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2064{
2065 /*
2066 * XXX: replace with spinlock if seen contended -bzzz
2067 */
2068 down_write(&EXT4_I(inode)->i_data_sem);
2069 if (newsize > EXT4_I(inode)->i_disksize)
2070 EXT4_I(inode)->i_disksize = newsize;
2071 up_write(&EXT4_I(inode)->i_data_sem);
2072 return ;
2073}
2074
2075struct ext4_group_info {
2076 unsigned long bb_state;
2077 struct rb_root bb_free_root;
2078 ext4_grpblk_t bb_first_free; /* first free block */
2079 ext4_grpblk_t bb_free; /* total free blocks */
2080 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2081 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2082 struct list_head bb_prealloc_list;
2083#ifdef DOUBLE_CHECK
2084 void *bb_bitmap;
2085#endif
2086 struct rw_semaphore alloc_sem;
2087 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2088 * regions, index is order.
2089 * bb_counters[3] = 5 means
2090 * 5 free 8-block regions. */
2091};
2092
2093#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2094#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2095
2096#define EXT4_MB_GRP_NEED_INIT(grp) \
2097 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2098
2099#define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2100 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2101#define EXT4_MB_GRP_SET_TRIMMED(grp) \
2102 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2103#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2104 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2105
2106#define EXT4_MAX_CONTENTION 8
2107#define EXT4_CONTENTION_THRESHOLD 2
2108
2109static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2110 ext4_group_t group)
2111{
2112 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2113}
2114
2115/*
2116 * Returns true if the filesystem is busy enough that attempts to
2117 * access the block group locks has run into contention.
2118 */
2119static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2120{
2121 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2122}
2123
2124static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2125{
2126 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2127 if (spin_trylock(lock))
2128 /*
2129 * We're able to grab the lock right away, so drop the
2130 * lock contention counter.
2131 */
2132 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2133 else {
2134 /*
2135 * The lock is busy, so bump the contention counter,
2136 * and then wait on the spin lock.
2137 */
2138 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2139 EXT4_MAX_CONTENTION);
2140 spin_lock(lock);
2141 }
2142}
2143
2144static inline void ext4_unlock_group(struct super_block *sb,
2145 ext4_group_t group)
2146{
2147 spin_unlock(ext4_group_lock_ptr(sb, group));
2148}
2149
2150static inline void ext4_mark_super_dirty(struct super_block *sb)
2151{
2152 if (EXT4_SB(sb)->s_journal == NULL)
2153 sb->s_dirt =1;
2154}
2155
2156/*
2157 * Block validity checking
2158 */
2159#define ext4_check_indirect_blockref(inode, bh) \
2160 ext4_check_blockref(__func__, __LINE__, inode, \
2161 (__le32 *)(bh)->b_data, \
2162 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2163
2164#define ext4_ind_check_inode(inode) \
2165 ext4_check_blockref(__func__, __LINE__, inode, \
2166 EXT4_I(inode)->i_data, \
2167 EXT4_NDIR_BLOCKS)
2168
2169/*
2170 * Inodes and files operations
2171 */
2172
2173/* dir.c */
2174extern const struct file_operations ext4_dir_operations;
2175
2176/* file.c */
2177extern const struct inode_operations ext4_file_inode_operations;
2178extern const struct file_operations ext4_file_operations;
2179extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2180
2181/* namei.c */
2182extern const struct inode_operations ext4_dir_inode_operations;
2183extern const struct inode_operations ext4_special_inode_operations;
2184extern struct dentry *ext4_get_parent(struct dentry *child);
2185
2186/* symlink.c */
2187extern const struct inode_operations ext4_symlink_inode_operations;
2188extern const struct inode_operations ext4_fast_symlink_inode_operations;
2189
2190/* block_validity */
2191extern void ext4_release_system_zone(struct super_block *sb);
2192extern int ext4_setup_system_zone(struct super_block *sb);
2193extern int __init ext4_init_system_zone(void);
2194extern void ext4_exit_system_zone(void);
2195extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2196 ext4_fsblk_t start_blk,
2197 unsigned int count);
2198extern int ext4_check_blockref(const char *, unsigned int,
2199 struct inode *, __le32 *, unsigned int);
2200
2201/* extents.c */
2202extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2203extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2204extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2205 int chunk);
2206extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2207 struct ext4_map_blocks *map, int flags);
2208extern void ext4_ext_truncate(struct inode *);
2209extern int ext4_ext_punch_hole(struct file *file, loff_t offset,
2210 loff_t length);
2211extern void ext4_ext_init(struct super_block *);
2212extern void ext4_ext_release(struct super_block *);
2213extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2214 loff_t len);
2215extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
2216 ssize_t len);
2217extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2218 struct ext4_map_blocks *map, int flags);
2219extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2220 __u64 start, __u64 len);
2221/* move_extent.c */
2222extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2223 __u64 start_orig, __u64 start_donor,
2224 __u64 len, __u64 *moved_len);
2225
2226/* page-io.c */
2227extern int __init ext4_init_pageio(void);
2228extern void ext4_exit_pageio(void);
2229extern void ext4_ioend_wait(struct inode *);
2230extern void ext4_free_io_end(ext4_io_end_t *io);
2231extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2232extern int ext4_end_io_nolock(ext4_io_end_t *io);
2233extern void ext4_io_submit(struct ext4_io_submit *io);
2234extern int ext4_bio_write_page(struct ext4_io_submit *io,
2235 struct page *page,
2236 int len,
2237 struct writeback_control *wbc);
2238
2239/* mmp.c */
2240extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2241
2242/* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2243enum ext4_state_bits {
2244 BH_Uninit /* blocks are allocated but uninitialized on disk */
2245 = BH_JBDPrivateStart,
2246};
2247
2248BUFFER_FNS(Uninit, uninit)
2249TAS_BUFFER_FNS(Uninit, uninit)
2250
2251/*
2252 * Add new method to test wether block and inode bitmaps are properly
2253 * initialized. With uninit_bg reading the block from disk is not enough
2254 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2255 */
2256#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2257
2258static inline int bitmap_uptodate(struct buffer_head *bh)
2259{
2260 return (buffer_uptodate(bh) &&
2261 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2262}
2263static inline void set_bitmap_uptodate(struct buffer_head *bh)
2264{
2265 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2266}
2267
2268#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2269
2270/* For ioend & aio unwritten conversion wait queues */
2271#define EXT4_WQ_HASH_SZ 37
2272#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2273 EXT4_WQ_HASH_SZ])
2274#define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2275 EXT4_WQ_HASH_SZ])
2276extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2277extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2278
2279#define EXT4_RESIZING 0
2280extern int ext4_resize_begin(struct super_block *sb);
2281extern void ext4_resize_end(struct super_block *sb);
2282
2283#endif /* __KERNEL__ */
2284
2285#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 */