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
33 /*
34 * The fourth extended filesystem constants/structures
35 */
36
37 /*
38 * Define EXT4FS_DEBUG to produce debug messages
39 */
40 #undef EXT4FS_DEBUG
41
42 /*
43 * Debug code
44 */
45 #ifdef EXT4FS_DEBUG
46 #define ext4_debug(f, a...) \
47 do { \
48 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
49 __FILE__, __LINE__, __func__); \
50 printk(KERN_DEBUG f, ## a); \
51 } while (0)
52 #else
53 #define ext4_debug(f, a...) do {} while (0)
54 #endif
55
56 /* data type for block offset of block group */
57 typedef int ext4_grpblk_t;
58
59 /* data type for filesystem-wide blocks number */
60 typedef unsigned long long ext4_fsblk_t;
61
62 /* data type for file logical block number */
63 typedef __u32 ext4_lblk_t;
64
65 /* data type for block group number */
66 typedef unsigned int ext4_group_t;
67
68
69 /* prefer goal again. length */
70 #define EXT4_MB_HINT_MERGE 1
71 /* blocks already reserved */
72 #define EXT4_MB_HINT_RESERVED 2
73 /* metadata is being allocated */
74 #define EXT4_MB_HINT_METADATA 4
75 /* first blocks in the file */
76 #define EXT4_MB_HINT_FIRST 8
77 /* search for the best chunk */
78 #define EXT4_MB_HINT_BEST 16
79 /* data is being allocated */
80 #define EXT4_MB_HINT_DATA 32
81 /* don't preallocate (for tails) */
82 #define EXT4_MB_HINT_NOPREALLOC 64
83 /* allocate for locality group */
84 #define EXT4_MB_HINT_GROUP_ALLOC 128
85 /* allocate goal blocks or none */
86 #define EXT4_MB_HINT_GOAL_ONLY 256
87 /* goal is meaningful */
88 #define EXT4_MB_HINT_TRY_GOAL 512
89 /* blocks already pre-reserved by delayed allocation */
90 #define EXT4_MB_DELALLOC_RESERVED 1024
91 /* We are doing stream allocation */
92 #define EXT4_MB_STREAM_ALLOC 2048
93
94
95 struct ext4_allocation_request {
96 /* target inode for block we're allocating */
97 struct inode *inode;
98 /* how many blocks we want to allocate */
99 unsigned int len;
100 /* logical block in target inode */
101 ext4_lblk_t logical;
102 /* the closest logical allocated block to the left */
103 ext4_lblk_t lleft;
104 /* the closest logical allocated block to the right */
105 ext4_lblk_t lright;
106 /* phys. target (a hint) */
107 ext4_fsblk_t goal;
108 /* phys. block for the closest logical allocated block to the left */
109 ext4_fsblk_t pleft;
110 /* phys. block for the closest logical allocated block to the right */
111 ext4_fsblk_t pright;
112 /* flags. see above EXT4_MB_HINT_* */
113 unsigned int flags;
114 };
115
116 #define DIO_AIO_UNWRITTEN 0x1
117 typedef struct ext4_io_end {
118 struct list_head list; /* per-file finished AIO list */
119 struct inode *inode; /* file being written to */
120 unsigned int flag; /* sync IO or AIO */
121 int error; /* I/O error code */
122 ext4_lblk_t offset; /* offset in the file */
123 size_t size; /* size of the extent */
124 struct work_struct work; /* data work queue */
125 } ext4_io_end_t;
126
127 /*
128 * Delayed allocation stuff
129 */
130
131 struct mpage_da_data {
132 struct inode *inode;
133 sector_t b_blocknr; /* start block number of extent */
134 size_t b_size; /* size of extent */
135 unsigned long b_state; /* state of the extent */
136 unsigned long first_page, next_page; /* extent of pages */
137 struct writeback_control *wbc;
138 int io_done;
139 int pages_written;
140 int retval;
141 };
142
143 /*
144 * Special inodes numbers
145 */
146 #define EXT4_BAD_INO 1 /* Bad blocks inode */
147 #define EXT4_ROOT_INO 2 /* Root inode */
148 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
149 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
150 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
151 #define EXT4_JOURNAL_INO 8 /* Journal inode */
152
153 /* First non-reserved inode for old ext4 filesystems */
154 #define EXT4_GOOD_OLD_FIRST_INO 11
155
156 /*
157 * Maximal count of links to a file
158 */
159 #define EXT4_LINK_MAX 65000
160
161 /*
162 * Macro-instructions used to manage several block sizes
163 */
164 #define EXT4_MIN_BLOCK_SIZE 1024
165 #define EXT4_MAX_BLOCK_SIZE 65536
166 #define EXT4_MIN_BLOCK_LOG_SIZE 10
167 #ifdef __KERNEL__
168 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
169 #else
170 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
171 #endif
172 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
173 #ifdef __KERNEL__
174 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
175 #else
176 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
177 #endif
178 #ifdef __KERNEL__
179 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
180 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
181 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
182 #else
183 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
184 EXT4_GOOD_OLD_INODE_SIZE : \
185 (s)->s_inode_size)
186 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
187 EXT4_GOOD_OLD_FIRST_INO : \
188 (s)->s_first_ino)
189 #endif
190 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
191
192 /*
193 * Structure of a blocks group descriptor
194 */
195 struct ext4_group_desc
196 {
197 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
198 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
199 __le32 bg_inode_table_lo; /* Inodes table block */
200 __le16 bg_free_blocks_count_lo;/* Free blocks count */
201 __le16 bg_free_inodes_count_lo;/* Free inodes count */
202 __le16 bg_used_dirs_count_lo; /* Directories count */
203 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
204 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
205 __le16 bg_itable_unused_lo; /* Unused inodes count */
206 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
207 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
208 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
209 __le32 bg_inode_table_hi; /* Inodes table block MSB */
210 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
211 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
212 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
213 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
214 __u32 bg_reserved2[3];
215 };
216
217 /*
218 * Structure of a flex block group info
219 */
220
221 struct flex_groups {
222 atomic_t free_inodes;
223 atomic_t free_blocks;
224 atomic_t used_dirs;
225 };
226
227 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
228 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
229 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
230
231 /*
232 * Macro-instructions used to manage group descriptors
233 */
234 #define EXT4_MIN_DESC_SIZE 32
235 #define EXT4_MIN_DESC_SIZE_64BIT 64
236 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
237 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
238 #ifdef __KERNEL__
239 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
240 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
241 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
242 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
243 #else
244 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
245 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
246 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
247 #endif
248
249 /*
250 * Constants relative to the data blocks
251 */
252 #define EXT4_NDIR_BLOCKS 12
253 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
254 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
255 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
256 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
257
258 /*
259 * Inode flags
260 */
261 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
262 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
263 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
264 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
265 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
266 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
267 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
268 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
269 /* Reserved for compression usage... */
270 #define EXT4_DIRTY_FL 0x00000100
271 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
272 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
273 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
274 /* End compression flags --- maybe not all used */
275 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
276 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
277 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
278 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
279 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
280 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
281 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
282 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
283 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
284
285 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
286 #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */
287
288 /* Flags that should be inherited by new inodes from their parent. */
289 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
290 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
291 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
292 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
293 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
294
295 /* Flags that are appropriate for regular files (all but dir-specific ones). */
296 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
297
298 /* Flags that are appropriate for non-directories/regular files. */
299 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
300
301 /* Mask out flags that are inappropriate for the given type of inode. */
302 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
303 {
304 if (S_ISDIR(mode))
305 return flags;
306 else if (S_ISREG(mode))
307 return flags & EXT4_REG_FLMASK;
308 else
309 return flags & EXT4_OTHER_FLMASK;
310 }
311
312 /*
313 * Inode dynamic state flags
314 */
315 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
316 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
317 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
318 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
319 #define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */
320 #define EXT4_STATE_EXT_MIGRATE 0x00000020 /* Inode is migrating */
321 #define EXT4_STATE_DIO_UNWRITTEN 0x00000040 /* need convert on dio done*/
322
323 /* Used to pass group descriptor data when online resize is done */
324 struct ext4_new_group_input {
325 __u32 group; /* Group number for this data */
326 __u64 block_bitmap; /* Absolute block number of block bitmap */
327 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
328 __u64 inode_table; /* Absolute block number of inode table start */
329 __u32 blocks_count; /* Total number of blocks in this group */
330 __u16 reserved_blocks; /* Number of reserved blocks in this group */
331 __u16 unused;
332 };
333
334 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
335 struct ext4_new_group_data {
336 __u32 group;
337 __u64 block_bitmap;
338 __u64 inode_bitmap;
339 __u64 inode_table;
340 __u32 blocks_count;
341 __u16 reserved_blocks;
342 __u16 unused;
343 __u32 free_blocks_count;
344 };
345
346 /*
347 * Flags used by ext4_get_blocks()
348 */
349 /* Allocate any needed blocks and/or convert an unitialized
350 extent to be an initialized ext4 */
351 #define EXT4_GET_BLOCKS_CREATE 0x0001
352 /* Request the creation of an unitialized extent */
353 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
354 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
355 EXT4_GET_BLOCKS_CREATE)
356 /* Caller is from the delayed allocation writeout path,
357 so set the magic i_delalloc_reserve_flag after taking the
358 inode allocation semaphore for */
359 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
360 /* Call ext4_da_update_reserve_space() after successfully
361 allocating the blocks */
362 #define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE 0x0008
363 /* caller is from the direct IO path, request to creation of an
364 unitialized extents if not allocated, split the uninitialized
365 extent if blocks has been preallocated already*/
366 #define EXT4_GET_BLOCKS_DIO 0x0010
367 #define EXT4_GET_BLOCKS_CONVERT 0x0020
368 #define EXT4_GET_BLOCKS_DIO_CREATE_EXT (EXT4_GET_BLOCKS_DIO|\
369 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
370 /* Convert extent to initialized after direct IO complete */
371 #define EXT4_GET_BLOCKS_DIO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
372 EXT4_GET_BLOCKS_DIO_CREATE_EXT)
373
374 /*
375 * ioctl commands
376 */
377 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
378 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
379 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
380 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
381 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
382 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
383 #ifdef CONFIG_JBD2_DEBUG
384 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
385 #endif
386 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
387 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
388 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
389 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
390 #define EXT4_IOC_MIGRATE _IO('f', 9)
391 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
392 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
393 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
394 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
395
396 /*
397 * ioctl commands in 32 bit emulation
398 */
399 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
400 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
401 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
402 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
403 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
404 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
405 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
406 #ifdef CONFIG_JBD2_DEBUG
407 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
408 #endif
409 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
410 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
411
412
413 /*
414 * Mount options
415 */
416 struct ext4_mount_options {
417 unsigned long s_mount_opt;
418 uid_t s_resuid;
419 gid_t s_resgid;
420 unsigned long s_commit_interval;
421 u32 s_min_batch_time, s_max_batch_time;
422 #ifdef CONFIG_QUOTA
423 int s_jquota_fmt;
424 char *s_qf_names[MAXQUOTAS];
425 #endif
426 };
427
428 /* Max physical block we can addres w/o extents */
429 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
430
431 /*
432 * Structure of an inode on the disk
433 */
434 struct ext4_inode {
435 __le16 i_mode; /* File mode */
436 __le16 i_uid; /* Low 16 bits of Owner Uid */
437 __le32 i_size_lo; /* Size in bytes */
438 __le32 i_atime; /* Access time */
439 __le32 i_ctime; /* Inode Change time */
440 __le32 i_mtime; /* Modification time */
441 __le32 i_dtime; /* Deletion Time */
442 __le16 i_gid; /* Low 16 bits of Group Id */
443 __le16 i_links_count; /* Links count */
444 __le32 i_blocks_lo; /* Blocks count */
445 __le32 i_flags; /* File flags */
446 union {
447 struct {
448 __le32 l_i_version;
449 } linux1;
450 struct {
451 __u32 h_i_translator;
452 } hurd1;
453 struct {
454 __u32 m_i_reserved1;
455 } masix1;
456 } osd1; /* OS dependent 1 */
457 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
458 __le32 i_generation; /* File version (for NFS) */
459 __le32 i_file_acl_lo; /* File ACL */
460 __le32 i_size_high;
461 __le32 i_obso_faddr; /* Obsoleted fragment address */
462 union {
463 struct {
464 __le16 l_i_blocks_high; /* were l_i_reserved1 */
465 __le16 l_i_file_acl_high;
466 __le16 l_i_uid_high; /* these 2 fields */
467 __le16 l_i_gid_high; /* were reserved2[0] */
468 __u32 l_i_reserved2;
469 } linux2;
470 struct {
471 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
472 __u16 h_i_mode_high;
473 __u16 h_i_uid_high;
474 __u16 h_i_gid_high;
475 __u32 h_i_author;
476 } hurd2;
477 struct {
478 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
479 __le16 m_i_file_acl_high;
480 __u32 m_i_reserved2[2];
481 } masix2;
482 } osd2; /* OS dependent 2 */
483 __le16 i_extra_isize;
484 __le16 i_pad1;
485 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
486 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
487 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
488 __le32 i_crtime; /* File Creation time */
489 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
490 __le32 i_version_hi; /* high 32 bits for 64-bit version */
491 };
492
493 struct move_extent {
494 __u32 reserved; /* should be zero */
495 __u32 donor_fd; /* donor file descriptor */
496 __u64 orig_start; /* logical start offset in block for orig */
497 __u64 donor_start; /* logical start offset in block for donor */
498 __u64 len; /* block length to be moved */
499 __u64 moved_len; /* moved block length */
500 };
501 #define MAX_DEFRAG_SIZE ((1UL<<31) - 1)
502
503 #define EXT4_EPOCH_BITS 2
504 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
505 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
506
507 /*
508 * Extended fields will fit into an inode if the filesystem was formatted
509 * with large inodes (-I 256 or larger) and there are not currently any EAs
510 * consuming all of the available space. For new inodes we always reserve
511 * enough space for the kernel's known extended fields, but for inodes
512 * created with an old kernel this might not have been the case. None of
513 * the extended inode fields is critical for correct filesystem operation.
514 * This macro checks if a certain field fits in the inode. Note that
515 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
516 */
517 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
518 ((offsetof(typeof(*ext4_inode), field) + \
519 sizeof((ext4_inode)->field)) \
520 <= (EXT4_GOOD_OLD_INODE_SIZE + \
521 (einode)->i_extra_isize)) \
522
523 static inline __le32 ext4_encode_extra_time(struct timespec *time)
524 {
525 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
526 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
527 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
528 }
529
530 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
531 {
532 if (sizeof(time->tv_sec) > 4)
533 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
534 << 32;
535 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
536 }
537
538 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
539 do { \
540 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
541 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
542 (raw_inode)->xtime ## _extra = \
543 ext4_encode_extra_time(&(inode)->xtime); \
544 } while (0)
545
546 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
547 do { \
548 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
549 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
550 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
551 (raw_inode)->xtime ## _extra = \
552 ext4_encode_extra_time(&(einode)->xtime); \
553 } while (0)
554
555 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
556 do { \
557 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
558 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
559 ext4_decode_extra_time(&(inode)->xtime, \
560 raw_inode->xtime ## _extra); \
561 } while (0)
562
563 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
564 do { \
565 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
566 (einode)->xtime.tv_sec = \
567 (signed)le32_to_cpu((raw_inode)->xtime); \
568 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
569 ext4_decode_extra_time(&(einode)->xtime, \
570 raw_inode->xtime ## _extra); \
571 } while (0)
572
573 #define i_disk_version osd1.linux1.l_i_version
574
575 #if defined(__KERNEL__) || defined(__linux__)
576 #define i_reserved1 osd1.linux1.l_i_reserved1
577 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
578 #define i_blocks_high osd2.linux2.l_i_blocks_high
579 #define i_uid_low i_uid
580 #define i_gid_low i_gid
581 #define i_uid_high osd2.linux2.l_i_uid_high
582 #define i_gid_high osd2.linux2.l_i_gid_high
583 #define i_reserved2 osd2.linux2.l_i_reserved2
584
585 #elif defined(__GNU__)
586
587 #define i_translator osd1.hurd1.h_i_translator
588 #define i_uid_high osd2.hurd2.h_i_uid_high
589 #define i_gid_high osd2.hurd2.h_i_gid_high
590 #define i_author osd2.hurd2.h_i_author
591
592 #elif defined(__masix__)
593
594 #define i_reserved1 osd1.masix1.m_i_reserved1
595 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
596 #define i_reserved2 osd2.masix2.m_i_reserved2
597
598 #endif /* defined(__KERNEL__) || defined(__linux__) */
599
600 /*
601 * storage for cached extent
602 */
603 struct ext4_ext_cache {
604 ext4_fsblk_t ec_start;
605 ext4_lblk_t ec_block;
606 __u32 ec_len; /* must be 32bit to return holes */
607 __u32 ec_type;
608 };
609
610 /*
611 * fourth extended file system inode data in memory
612 */
613 struct ext4_inode_info {
614 __le32 i_data[15]; /* unconverted */
615 __u32 i_flags;
616 ext4_fsblk_t i_file_acl;
617 __u32 i_dtime;
618
619 /*
620 * i_block_group is the number of the block group which contains
621 * this file's inode. Constant across the lifetime of the inode,
622 * it is ued for making block allocation decisions - we try to
623 * place a file's data blocks near its inode block, and new inodes
624 * near to their parent directory's inode.
625 */
626 ext4_group_t i_block_group;
627 __u32 i_state; /* Dynamic state flags for ext4 */
628
629 ext4_lblk_t i_dir_start_lookup;
630 #ifdef CONFIG_EXT4_FS_XATTR
631 /*
632 * Extended attributes can be read independently of the main file
633 * data. Taking i_mutex even when reading would cause contention
634 * between readers of EAs and writers of regular file data, so
635 * instead we synchronize on xattr_sem when reading or changing
636 * EAs.
637 */
638 struct rw_semaphore xattr_sem;
639 #endif
640
641 struct list_head i_orphan; /* unlinked but open inodes */
642
643 /*
644 * i_disksize keeps track of what the inode size is ON DISK, not
645 * in memory. During truncate, i_size is set to the new size by
646 * the VFS prior to calling ext4_truncate(), but the filesystem won't
647 * set i_disksize to 0 until the truncate is actually under way.
648 *
649 * The intent is that i_disksize always represents the blocks which
650 * are used by this file. This allows recovery to restart truncate
651 * on orphans if we crash during truncate. We actually write i_disksize
652 * into the on-disk inode when writing inodes out, instead of i_size.
653 *
654 * The only time when i_disksize and i_size may be different is when
655 * a truncate is in progress. The only things which change i_disksize
656 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
657 */
658 loff_t i_disksize;
659
660 /*
661 * i_data_sem is for serialising ext4_truncate() against
662 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
663 * data tree are chopped off during truncate. We can't do that in
664 * ext4 because whenever we perform intermediate commits during
665 * truncate, the inode and all the metadata blocks *must* be in a
666 * consistent state which allows truncation of the orphans to restart
667 * during recovery. Hence we must fix the get_block-vs-truncate race
668 * by other means, so we have i_data_sem.
669 */
670 struct rw_semaphore i_data_sem;
671 struct inode vfs_inode;
672 struct jbd2_inode jinode;
673
674 struct ext4_ext_cache i_cached_extent;
675 /*
676 * File creation time. Its function is same as that of
677 * struct timespec i_{a,c,m}time in the generic inode.
678 */
679 struct timespec i_crtime;
680
681 /* mballoc */
682 struct list_head i_prealloc_list;
683 spinlock_t i_prealloc_lock;
684
685 /* ialloc */
686 ext4_group_t i_last_alloc_group;
687
688 /* allocation reservation info for delalloc */
689 unsigned int i_reserved_data_blocks;
690 unsigned int i_reserved_meta_blocks;
691 unsigned int i_allocated_meta_blocks;
692 unsigned short i_delalloc_reserved_flag;
693
694 /* on-disk additional length */
695 __u16 i_extra_isize;
696
697 spinlock_t i_block_reservation_lock;
698 #ifdef CONFIG_QUOTA
699 /* quota space reservation, managed internally by quota code */
700 qsize_t i_reserved_quota;
701 #endif
702
703 /* completed async DIOs that might need unwritten extents handling */
704 struct list_head i_aio_dio_complete_list;
705 /* current io_end structure for async DIO write*/
706 ext4_io_end_t *cur_aio_dio;
707
708 /*
709 * Transactions that contain inode's metadata needed to complete
710 * fsync and fdatasync, respectively.
711 */
712 tid_t i_sync_tid;
713 tid_t i_datasync_tid;
714 };
715
716 /*
717 * File system states
718 */
719 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
720 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
721 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
722
723 /*
724 * Misc. filesystem flags
725 */
726 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
727 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
728 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
729
730 /*
731 * Mount flags
732 */
733 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
734 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
735 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
736 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
737 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
738 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
739 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
740 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
741 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
742 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
743 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
744 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
745 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
746 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
747 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
748 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
749 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
750 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
751 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
752 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
753 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
754 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
755 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
756 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
757 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
758 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
759 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
760 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
761 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
762
763 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
764 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
765 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
766 EXT4_MOUNT_##opt)
767
768 #define ext4_set_bit ext2_set_bit
769 #define ext4_set_bit_atomic ext2_set_bit_atomic
770 #define ext4_clear_bit ext2_clear_bit
771 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
772 #define ext4_test_bit ext2_test_bit
773 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
774 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
775 #define ext4_find_next_bit ext2_find_next_bit
776
777 /*
778 * Maximal mount counts between two filesystem checks
779 */
780 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
781 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
782
783 /*
784 * Behaviour when detecting errors
785 */
786 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
787 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
788 #define EXT4_ERRORS_PANIC 3 /* Panic */
789 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
790
791 /*
792 * Structure of the super block
793 */
794 struct ext4_super_block {
795 /*00*/ __le32 s_inodes_count; /* Inodes count */
796 __le32 s_blocks_count_lo; /* Blocks count */
797 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
798 __le32 s_free_blocks_count_lo; /* Free blocks count */
799 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
800 __le32 s_first_data_block; /* First Data Block */
801 __le32 s_log_block_size; /* Block size */
802 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
803 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
804 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
805 __le32 s_inodes_per_group; /* # Inodes per group */
806 __le32 s_mtime; /* Mount time */
807 /*30*/ __le32 s_wtime; /* Write time */
808 __le16 s_mnt_count; /* Mount count */
809 __le16 s_max_mnt_count; /* Maximal mount count */
810 __le16 s_magic; /* Magic signature */
811 __le16 s_state; /* File system state */
812 __le16 s_errors; /* Behaviour when detecting errors */
813 __le16 s_minor_rev_level; /* minor revision level */
814 /*40*/ __le32 s_lastcheck; /* time of last check */
815 __le32 s_checkinterval; /* max. time between checks */
816 __le32 s_creator_os; /* OS */
817 __le32 s_rev_level; /* Revision level */
818 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
819 __le16 s_def_resgid; /* Default gid for reserved blocks */
820 /*
821 * These fields are for EXT4_DYNAMIC_REV superblocks only.
822 *
823 * Note: the difference between the compatible feature set and
824 * the incompatible feature set is that if there is a bit set
825 * in the incompatible feature set that the kernel doesn't
826 * know about, it should refuse to mount the filesystem.
827 *
828 * e2fsck's requirements are more strict; if it doesn't know
829 * about a feature in either the compatible or incompatible
830 * feature set, it must abort and not try to meddle with
831 * things it doesn't understand...
832 */
833 __le32 s_first_ino; /* First non-reserved inode */
834 __le16 s_inode_size; /* size of inode structure */
835 __le16 s_block_group_nr; /* block group # of this superblock */
836 __le32 s_feature_compat; /* compatible feature set */
837 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
838 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
839 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
840 /*78*/ char s_volume_name[16]; /* volume name */
841 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
842 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
843 /*
844 * Performance hints. Directory preallocation should only
845 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
846 */
847 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
848 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
849 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
850 /*
851 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
852 */
853 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
854 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
855 __le32 s_journal_dev; /* device number of journal file */
856 __le32 s_last_orphan; /* start of list of inodes to delete */
857 __le32 s_hash_seed[4]; /* HTREE hash seed */
858 __u8 s_def_hash_version; /* Default hash version to use */
859 __u8 s_reserved_char_pad;
860 __le16 s_desc_size; /* size of group descriptor */
861 /*100*/ __le32 s_default_mount_opts;
862 __le32 s_first_meta_bg; /* First metablock block group */
863 __le32 s_mkfs_time; /* When the filesystem was created */
864 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
865 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
866 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
867 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
868 __le32 s_free_blocks_count_hi; /* Free blocks count */
869 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
870 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
871 __le32 s_flags; /* Miscellaneous flags */
872 __le16 s_raid_stride; /* RAID stride */
873 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
874 __le64 s_mmp_block; /* Block for multi-mount protection */
875 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
876 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
877 __u8 s_reserved_char_pad2;
878 __le16 s_reserved_pad;
879 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
880 __u32 s_reserved[160]; /* Padding to the end of the block */
881 };
882
883 #ifdef __KERNEL__
884
885 /*
886 * run-time mount flags
887 */
888 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
889 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
890
891 /*
892 * fourth extended-fs super-block data in memory
893 */
894 struct ext4_sb_info {
895 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
896 unsigned long s_inodes_per_block;/* Number of inodes per block */
897 unsigned long s_blocks_per_group;/* Number of blocks in a group */
898 unsigned long s_inodes_per_group;/* Number of inodes in a group */
899 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
900 unsigned long s_gdb_count; /* Number of group descriptor blocks */
901 unsigned long s_desc_per_block; /* Number of group descriptors per block */
902 ext4_group_t s_groups_count; /* Number of groups in the fs */
903 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
904 unsigned long s_overhead_last; /* Last calculated overhead */
905 unsigned long s_blocks_last; /* Last seen block count */
906 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
907 struct buffer_head * s_sbh; /* Buffer containing the super block */
908 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
909 struct buffer_head **s_group_desc;
910 unsigned int s_mount_opt;
911 unsigned int s_mount_flags;
912 ext4_fsblk_t s_sb_block;
913 uid_t s_resuid;
914 gid_t s_resgid;
915 unsigned short s_mount_state;
916 unsigned short s_pad;
917 int s_addr_per_block_bits;
918 int s_desc_per_block_bits;
919 int s_inode_size;
920 int s_first_ino;
921 unsigned int s_inode_readahead_blks;
922 unsigned int s_inode_goal;
923 spinlock_t s_next_gen_lock;
924 u32 s_next_generation;
925 u32 s_hash_seed[4];
926 int s_def_hash_version;
927 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
928 struct percpu_counter s_freeblocks_counter;
929 struct percpu_counter s_freeinodes_counter;
930 struct percpu_counter s_dirs_counter;
931 struct percpu_counter s_dirtyblocks_counter;
932 struct blockgroup_lock *s_blockgroup_lock;
933 struct proc_dir_entry *s_proc;
934 struct kobject s_kobj;
935 struct completion s_kobj_unregister;
936
937 /* Journaling */
938 struct inode *s_journal_inode;
939 struct journal_s *s_journal;
940 struct list_head s_orphan;
941 struct mutex s_orphan_lock;
942 struct mutex s_resize_lock;
943 unsigned long s_commit_interval;
944 u32 s_max_batch_time;
945 u32 s_min_batch_time;
946 struct block_device *journal_bdev;
947 #ifdef CONFIG_JBD2_DEBUG
948 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
949 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
950 #endif
951 #ifdef CONFIG_QUOTA
952 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
953 int s_jquota_fmt; /* Format of quota to use */
954 #endif
955 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
956 struct rb_root system_blks;
957
958 #ifdef EXTENTS_STATS
959 /* ext4 extents stats */
960 unsigned long s_ext_min;
961 unsigned long s_ext_max;
962 unsigned long s_depth_max;
963 spinlock_t s_ext_stats_lock;
964 unsigned long s_ext_blocks;
965 unsigned long s_ext_extents;
966 #endif
967
968 /* for buddy allocator */
969 struct ext4_group_info ***s_group_info;
970 struct inode *s_buddy_cache;
971 long s_blocks_reserved;
972 spinlock_t s_reserve_lock;
973 spinlock_t s_md_lock;
974 tid_t s_last_transaction;
975 unsigned short *s_mb_offsets;
976 unsigned int *s_mb_maxs;
977
978 /* tunables */
979 unsigned long s_stripe;
980 unsigned int s_mb_stream_request;
981 unsigned int s_mb_max_to_scan;
982 unsigned int s_mb_min_to_scan;
983 unsigned int s_mb_stats;
984 unsigned int s_mb_order2_reqs;
985 unsigned int s_mb_group_prealloc;
986 unsigned int s_max_writeback_mb_bump;
987 /* where last allocation was done - for stream allocation */
988 unsigned long s_mb_last_group;
989 unsigned long s_mb_last_start;
990
991 /* history to debug policy */
992 struct ext4_mb_history *s_mb_history;
993 int s_mb_history_cur;
994 int s_mb_history_max;
995 int s_mb_history_num;
996 spinlock_t s_mb_history_lock;
997 int s_mb_history_filter;
998
999 /* stats for buddy allocator */
1000 spinlock_t s_mb_pa_lock;
1001 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1002 atomic_t s_bal_success; /* we found long enough chunks */
1003 atomic_t s_bal_allocated; /* in blocks */
1004 atomic_t s_bal_ex_scanned; /* total extents scanned */
1005 atomic_t s_bal_goals; /* goal hits */
1006 atomic_t s_bal_breaks; /* too long searches */
1007 atomic_t s_bal_2orders; /* 2^order hits */
1008 spinlock_t s_bal_lock;
1009 unsigned long s_mb_buddies_generated;
1010 unsigned long long s_mb_generation_time;
1011 atomic_t s_mb_lost_chunks;
1012 atomic_t s_mb_preallocated;
1013 atomic_t s_mb_discarded;
1014 atomic_t s_lock_busy;
1015
1016 /* locality groups */
1017 struct ext4_locality_group *s_locality_groups;
1018
1019 /* for write statistics */
1020 unsigned long s_sectors_written_start;
1021 u64 s_kbytes_written;
1022
1023 unsigned int s_log_groups_per_flex;
1024 struct flex_groups *s_flex_groups;
1025
1026 /* workqueue for dio unwritten */
1027 struct workqueue_struct *dio_unwritten_wq;
1028 };
1029
1030 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1031 {
1032 return sb->s_fs_info;
1033 }
1034 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1035 {
1036 return container_of(inode, struct ext4_inode_info, vfs_inode);
1037 }
1038
1039 static inline struct timespec ext4_current_time(struct inode *inode)
1040 {
1041 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1042 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1043 }
1044
1045 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1046 {
1047 return ino == EXT4_ROOT_INO ||
1048 ino == EXT4_JOURNAL_INO ||
1049 ino == EXT4_RESIZE_INO ||
1050 (ino >= EXT4_FIRST_INO(sb) &&
1051 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1052 }
1053 #else
1054 /* Assume that user mode programs are passing in an ext4fs superblock, not
1055 * a kernel struct super_block. This will allow us to call the feature-test
1056 * macros from user land. */
1057 #define EXT4_SB(sb) (sb)
1058 #endif
1059
1060 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1061
1062 /*
1063 * Codes for operating systems
1064 */
1065 #define EXT4_OS_LINUX 0
1066 #define EXT4_OS_HURD 1
1067 #define EXT4_OS_MASIX 2
1068 #define EXT4_OS_FREEBSD 3
1069 #define EXT4_OS_LITES 4
1070
1071 /*
1072 * Revision levels
1073 */
1074 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1075 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1076
1077 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1078 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1079
1080 #define EXT4_GOOD_OLD_INODE_SIZE 128
1081
1082 /*
1083 * Feature set definitions
1084 */
1085
1086 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1087 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1088 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1089 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1090 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1091 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1092 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1093 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1094 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1095 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1096 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1097 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1098 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1099 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1100 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1101 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1102 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1103 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1104
1105 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1106 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1107 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1108 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1109 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1110 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1111
1112 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1113 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1114 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1115 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1116 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1117 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1118 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1119
1120 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1121 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1122 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1123 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1124 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1125 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1126 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1127 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1128 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1129
1130 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1131 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1132 EXT4_FEATURE_INCOMPAT_RECOVER| \
1133 EXT4_FEATURE_INCOMPAT_META_BG| \
1134 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1135 EXT4_FEATURE_INCOMPAT_64BIT| \
1136 EXT4_FEATURE_INCOMPAT_FLEX_BG)
1137 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1138 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1139 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1140 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1141 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1142 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1143 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
1144
1145 /*
1146 * Default values for user and/or group using reserved blocks
1147 */
1148 #define EXT4_DEF_RESUID 0
1149 #define EXT4_DEF_RESGID 0
1150
1151 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1152
1153 /*
1154 * Default mount options
1155 */
1156 #define EXT4_DEFM_DEBUG 0x0001
1157 #define EXT4_DEFM_BSDGROUPS 0x0002
1158 #define EXT4_DEFM_XATTR_USER 0x0004
1159 #define EXT4_DEFM_ACL 0x0008
1160 #define EXT4_DEFM_UID16 0x0010
1161 #define EXT4_DEFM_JMODE 0x0060
1162 #define EXT4_DEFM_JMODE_DATA 0x0020
1163 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1164 #define EXT4_DEFM_JMODE_WBACK 0x0060
1165
1166 /*
1167 * Default journal batch times
1168 */
1169 #define EXT4_DEF_MIN_BATCH_TIME 0
1170 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1171
1172 /*
1173 * Minimum number of groups in a flexgroup before we separate out
1174 * directories into the first block group of a flexgroup
1175 */
1176 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1177
1178 /*
1179 * Structure of a directory entry
1180 */
1181 #define EXT4_NAME_LEN 255
1182
1183 struct ext4_dir_entry {
1184 __le32 inode; /* Inode number */
1185 __le16 rec_len; /* Directory entry length */
1186 __le16 name_len; /* Name length */
1187 char name[EXT4_NAME_LEN]; /* File name */
1188 };
1189
1190 /*
1191 * The new version of the directory entry. Since EXT4 structures are
1192 * stored in intel byte order, and the name_len field could never be
1193 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1194 * file_type field.
1195 */
1196 struct ext4_dir_entry_2 {
1197 __le32 inode; /* Inode number */
1198 __le16 rec_len; /* Directory entry length */
1199 __u8 name_len; /* Name length */
1200 __u8 file_type;
1201 char name[EXT4_NAME_LEN]; /* File name */
1202 };
1203
1204 /*
1205 * Ext4 directory file types. Only the low 3 bits are used. The
1206 * other bits are reserved for now.
1207 */
1208 #define EXT4_FT_UNKNOWN 0
1209 #define EXT4_FT_REG_FILE 1
1210 #define EXT4_FT_DIR 2
1211 #define EXT4_FT_CHRDEV 3
1212 #define EXT4_FT_BLKDEV 4
1213 #define EXT4_FT_FIFO 5
1214 #define EXT4_FT_SOCK 6
1215 #define EXT4_FT_SYMLINK 7
1216
1217 #define EXT4_FT_MAX 8
1218
1219 /*
1220 * EXT4_DIR_PAD defines the directory entries boundaries
1221 *
1222 * NOTE: It must be a multiple of 4
1223 */
1224 #define EXT4_DIR_PAD 4
1225 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1226 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1227 ~EXT4_DIR_ROUND)
1228 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1229
1230 /*
1231 * Hash Tree Directory indexing
1232 * (c) Daniel Phillips, 2001
1233 */
1234
1235 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1236 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1237 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
1238 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1239 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1240
1241 /* Legal values for the dx_root hash_version field: */
1242
1243 #define DX_HASH_LEGACY 0
1244 #define DX_HASH_HALF_MD4 1
1245 #define DX_HASH_TEA 2
1246 #define DX_HASH_LEGACY_UNSIGNED 3
1247 #define DX_HASH_HALF_MD4_UNSIGNED 4
1248 #define DX_HASH_TEA_UNSIGNED 5
1249
1250 #ifdef __KERNEL__
1251
1252 /* hash info structure used by the directory hash */
1253 struct dx_hash_info
1254 {
1255 u32 hash;
1256 u32 minor_hash;
1257 int hash_version;
1258 u32 *seed;
1259 };
1260
1261 #define EXT4_HTREE_EOF 0x7fffffff
1262
1263 /*
1264 * Control parameters used by ext4_htree_next_block
1265 */
1266 #define HASH_NB_ALWAYS 1
1267
1268
1269 /*
1270 * Describe an inode's exact location on disk and in memory
1271 */
1272 struct ext4_iloc
1273 {
1274 struct buffer_head *bh;
1275 unsigned long offset;
1276 ext4_group_t block_group;
1277 };
1278
1279 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1280 {
1281 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1282 }
1283
1284 /*
1285 * This structure is stuffed into the struct file's private_data field
1286 * for directories. It is where we put information so that we can do
1287 * readdir operations in hash tree order.
1288 */
1289 struct dir_private_info {
1290 struct rb_root root;
1291 struct rb_node *curr_node;
1292 struct fname *extra_fname;
1293 loff_t last_pos;
1294 __u32 curr_hash;
1295 __u32 curr_minor_hash;
1296 __u32 next_hash;
1297 };
1298
1299 /* calculate the first block number of the group */
1300 static inline ext4_fsblk_t
1301 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1302 {
1303 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1304 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1305 }
1306
1307 /*
1308 * Special error return code only used by dx_probe() and its callers.
1309 */
1310 #define ERR_BAD_DX_DIR -75000
1311
1312 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1313 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1314
1315 extern struct proc_dir_entry *ext4_proc_root;
1316
1317 /*
1318 * Function prototypes
1319 */
1320
1321 /*
1322 * Ok, these declarations are also in <linux/kernel.h> but none of the
1323 * ext4 source programs needs to include it so they are duplicated here.
1324 */
1325 # define NORET_TYPE /**/
1326 # define ATTRIB_NORET __attribute__((noreturn))
1327 # define NORET_AND noreturn,
1328
1329 /* bitmap.c */
1330 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1331
1332 /* balloc.c */
1333 extern unsigned int ext4_block_group(struct super_block *sb,
1334 ext4_fsblk_t blocknr);
1335 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1336 ext4_fsblk_t blocknr);
1337 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1338 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1339 ext4_group_t group);
1340 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1341 ext4_fsblk_t goal, unsigned long *count, int *errp);
1342 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1343 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1344 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1345 ext4_fsblk_t block, unsigned long count, int metadata);
1346 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1347 ext4_fsblk_t block, unsigned long count);
1348 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1349 extern void ext4_check_blocks_bitmap(struct super_block *);
1350 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1351 ext4_group_t block_group,
1352 struct buffer_head ** bh);
1353 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1354 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1355 ext4_group_t block_group);
1356 extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1357 struct buffer_head *bh,
1358 ext4_group_t group,
1359 struct ext4_group_desc *desc);
1360 #define ext4_free_blocks_after_init(sb, group, desc) \
1361 ext4_init_block_bitmap(sb, NULL, group, desc)
1362
1363 /* dir.c */
1364 extern int ext4_check_dir_entry(const char *, struct inode *,
1365 struct ext4_dir_entry_2 *,
1366 struct buffer_head *, unsigned int);
1367 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1368 __u32 minor_hash,
1369 struct ext4_dir_entry_2 *dirent);
1370 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1371
1372 /* fsync.c */
1373 extern int ext4_sync_file(struct file *, struct dentry *, int);
1374
1375 /* hash.c */
1376 extern int ext4fs_dirhash(const char *name, int len, struct
1377 dx_hash_info *hinfo);
1378
1379 /* ialloc.c */
1380 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
1381 const struct qstr *qstr, __u32 goal);
1382 extern void ext4_free_inode(handle_t *, struct inode *);
1383 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1384 extern unsigned long ext4_count_free_inodes(struct super_block *);
1385 extern unsigned long ext4_count_dirs(struct super_block *);
1386 extern void ext4_check_inodes_bitmap(struct super_block *);
1387 extern unsigned ext4_init_inode_bitmap(struct super_block *sb,
1388 struct buffer_head *bh,
1389 ext4_group_t group,
1390 struct ext4_group_desc *desc);
1391 extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1392
1393 /* mballoc.c */
1394 extern long ext4_mb_stats;
1395 extern long ext4_mb_max_to_scan;
1396 extern int ext4_mb_init(struct super_block *, int);
1397 extern int ext4_mb_release(struct super_block *);
1398 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1399 struct ext4_allocation_request *, int *);
1400 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1401 extern void ext4_discard_preallocations(struct inode *);
1402 extern int __init init_ext4_mballoc(void);
1403 extern void exit_ext4_mballoc(void);
1404 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1405 ext4_fsblk_t, unsigned long, int, unsigned long *);
1406 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1407 ext4_group_t i, struct ext4_group_desc *desc);
1408 extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
1409 ext4_grpblk_t add);
1410 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1411 extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1412 ext4_group_t, int);
1413 /* inode.c */
1414 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1415 struct buffer_head *bh, ext4_fsblk_t blocknr);
1416 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1417 ext4_lblk_t, int, int *);
1418 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1419 ext4_lblk_t, int, int *);
1420 int ext4_get_block(struct inode *inode, sector_t iblock,
1421 struct buffer_head *bh_result, int create);
1422
1423 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1424 extern int ext4_write_inode(struct inode *, int);
1425 extern int ext4_setattr(struct dentry *, struct iattr *);
1426 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1427 struct kstat *stat);
1428 extern void ext4_delete_inode(struct inode *);
1429 extern int ext4_sync_inode(handle_t *, struct inode *);
1430 extern void ext4_dirty_inode(struct inode *);
1431 extern int ext4_change_inode_journal_flag(struct inode *, int);
1432 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1433 extern int ext4_can_truncate(struct inode *inode);
1434 extern void ext4_truncate(struct inode *);
1435 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1436 extern void ext4_set_inode_flags(struct inode *);
1437 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1438 extern int ext4_alloc_da_blocks(struct inode *inode);
1439 extern void ext4_set_aops(struct inode *inode);
1440 extern int ext4_writepage_trans_blocks(struct inode *);
1441 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
1442 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1443 extern int ext4_block_truncate_page(handle_t *handle,
1444 struct address_space *mapping, loff_t from);
1445 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1446 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
1447 extern int flush_aio_dio_completed_IO(struct inode *inode);
1448 /* ioctl.c */
1449 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1450 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1451
1452 /* migrate.c */
1453 extern int ext4_ext_migrate(struct inode *);
1454
1455 /* namei.c */
1456 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize);
1457 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize);
1458 extern int ext4_orphan_add(handle_t *, struct inode *);
1459 extern int ext4_orphan_del(handle_t *, struct inode *);
1460 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1461 __u32 start_minor_hash, __u32 *next_hash);
1462
1463 /* resize.c */
1464 extern int ext4_group_add(struct super_block *sb,
1465 struct ext4_new_group_data *input);
1466 extern int ext4_group_extend(struct super_block *sb,
1467 struct ext4_super_block *es,
1468 ext4_fsblk_t n_blocks_count);
1469
1470 /* super.c */
1471 extern void ext4_error(struct super_block *, const char *, const char *, ...)
1472 __attribute__ ((format (printf, 3, 4)));
1473 extern void __ext4_std_error(struct super_block *, const char *, int);
1474 extern void ext4_abort(struct super_block *, const char *, const char *, ...)
1475 __attribute__ ((format (printf, 3, 4)));
1476 extern void ext4_warning(struct super_block *, const char *, const char *, ...)
1477 __attribute__ ((format (printf, 3, 4)));
1478 extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1479 __attribute__ ((format (printf, 3, 4)));
1480 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1481 const char *, const char *, ...)
1482 __attribute__ ((format (printf, 4, 5)));
1483 extern void ext4_update_dynamic_rev(struct super_block *sb);
1484 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1485 __u32 compat);
1486 extern int ext4_update_rocompat_feature(handle_t *handle,
1487 struct super_block *sb, __u32 rocompat);
1488 extern int ext4_update_incompat_feature(handle_t *handle,
1489 struct super_block *sb, __u32 incompat);
1490 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1491 struct ext4_group_desc *bg);
1492 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1493 struct ext4_group_desc *bg);
1494 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1495 struct ext4_group_desc *bg);
1496 extern __u32 ext4_free_blks_count(struct super_block *sb,
1497 struct ext4_group_desc *bg);
1498 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1499 struct ext4_group_desc *bg);
1500 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1501 struct ext4_group_desc *bg);
1502 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1503 struct ext4_group_desc *bg);
1504 extern void ext4_block_bitmap_set(struct super_block *sb,
1505 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1506 extern void ext4_inode_bitmap_set(struct super_block *sb,
1507 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1508 extern void ext4_inode_table_set(struct super_block *sb,
1509 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1510 extern void ext4_free_blks_set(struct super_block *sb,
1511 struct ext4_group_desc *bg, __u32 count);
1512 extern void ext4_free_inodes_set(struct super_block *sb,
1513 struct ext4_group_desc *bg, __u32 count);
1514 extern void ext4_used_dirs_set(struct super_block *sb,
1515 struct ext4_group_desc *bg, __u32 count);
1516 extern void ext4_itable_unused_set(struct super_block *sb,
1517 struct ext4_group_desc *bg, __u32 count);
1518 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1519 struct ext4_group_desc *gdp);
1520 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1521 struct ext4_group_desc *gdp);
1522
1523 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1524 {
1525 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1526 le32_to_cpu(es->s_blocks_count_lo);
1527 }
1528
1529 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1530 {
1531 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1532 le32_to_cpu(es->s_r_blocks_count_lo);
1533 }
1534
1535 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1536 {
1537 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1538 le32_to_cpu(es->s_free_blocks_count_lo);
1539 }
1540
1541 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1542 ext4_fsblk_t blk)
1543 {
1544 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1545 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1546 }
1547
1548 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1549 ext4_fsblk_t blk)
1550 {
1551 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1552 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1553 }
1554
1555 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1556 ext4_fsblk_t blk)
1557 {
1558 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1559 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1560 }
1561
1562 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1563 {
1564 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1565 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1566 le32_to_cpu(raw_inode->i_size_lo);
1567 else
1568 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
1569 }
1570
1571 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1572 {
1573 raw_inode->i_size_lo = cpu_to_le32(i_size);
1574 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1575 }
1576
1577 static inline
1578 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1579 ext4_group_t group)
1580 {
1581 struct ext4_group_info ***grp_info;
1582 long indexv, indexh;
1583 grp_info = EXT4_SB(sb)->s_group_info;
1584 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1585 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1586 return grp_info[indexv][indexh];
1587 }
1588
1589 /*
1590 * Reading s_groups_count requires using smp_rmb() afterwards. See
1591 * the locking protocol documented in the comments of ext4_group_add()
1592 * in resize.c
1593 */
1594 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
1595 {
1596 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
1597
1598 smp_rmb();
1599 return ngroups;
1600 }
1601
1602 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1603 ext4_group_t block_group)
1604 {
1605 return block_group >> sbi->s_log_groups_per_flex;
1606 }
1607
1608 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1609 {
1610 return 1 << sbi->s_log_groups_per_flex;
1611 }
1612
1613 #define ext4_std_error(sb, errno) \
1614 do { \
1615 if ((errno)) \
1616 __ext4_std_error((sb), __func__, (errno)); \
1617 } while (0)
1618
1619 #ifdef CONFIG_SMP
1620 /* Each CPU can accumulate percpu_counter_batch blocks in their local
1621 * counters. So we need to make sure we have free blocks more
1622 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
1623 */
1624 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1625 #else
1626 #define EXT4_FREEBLOCKS_WATERMARK 0
1627 #endif
1628
1629 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1630 {
1631 /*
1632 * XXX: replace with spinlock if seen contended -bzzz
1633 */
1634 down_write(&EXT4_I(inode)->i_data_sem);
1635 if (newsize > EXT4_I(inode)->i_disksize)
1636 EXT4_I(inode)->i_disksize = newsize;
1637 up_write(&EXT4_I(inode)->i_data_sem);
1638 return ;
1639 }
1640
1641 struct ext4_group_info {
1642 unsigned long bb_state;
1643 struct rb_root bb_free_root;
1644 unsigned short bb_first_free;
1645 unsigned short bb_free;
1646 unsigned short bb_fragments;
1647 struct list_head bb_prealloc_list;
1648 #ifdef DOUBLE_CHECK
1649 void *bb_bitmap;
1650 #endif
1651 struct rw_semaphore alloc_sem;
1652 unsigned short bb_counters[];
1653 };
1654
1655 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1656
1657 #define EXT4_MB_GRP_NEED_INIT(grp) \
1658 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1659
1660 #define EXT4_MAX_CONTENTION 8
1661 #define EXT4_CONTENTION_THRESHOLD 2
1662
1663 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
1664 ext4_group_t group)
1665 {
1666 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
1667 }
1668
1669 /*
1670 * Returns true if the filesystem is busy enough that attempts to
1671 * access the block group locks has run into contention.
1672 */
1673 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
1674 {
1675 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
1676 }
1677
1678 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1679 {
1680 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
1681 if (spin_trylock(lock))
1682 /*
1683 * We're able to grab the lock right away, so drop the
1684 * lock contention counter.
1685 */
1686 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
1687 else {
1688 /*
1689 * The lock is busy, so bump the contention counter,
1690 * and then wait on the spin lock.
1691 */
1692 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
1693 EXT4_MAX_CONTENTION);
1694 spin_lock(lock);
1695 }
1696 }
1697
1698 static inline void ext4_unlock_group(struct super_block *sb,
1699 ext4_group_t group)
1700 {
1701 spin_unlock(ext4_group_lock_ptr(sb, group));
1702 }
1703
1704 /*
1705 * Inodes and files operations
1706 */
1707
1708 /* dir.c */
1709 extern const struct file_operations ext4_dir_operations;
1710
1711 /* file.c */
1712 extern const struct inode_operations ext4_file_inode_operations;
1713 extern const struct file_operations ext4_file_operations;
1714
1715 /* namei.c */
1716 extern const struct inode_operations ext4_dir_inode_operations;
1717 extern const struct inode_operations ext4_special_inode_operations;
1718 extern struct dentry *ext4_get_parent(struct dentry *child);
1719
1720 /* symlink.c */
1721 extern const struct inode_operations ext4_symlink_inode_operations;
1722 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1723
1724 /* block_validity */
1725 extern void ext4_release_system_zone(struct super_block *sb);
1726 extern int ext4_setup_system_zone(struct super_block *sb);
1727 extern int __init init_ext4_system_zone(void);
1728 extern void exit_ext4_system_zone(void);
1729 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
1730 ext4_fsblk_t start_blk,
1731 unsigned int count);
1732
1733 /* extents.c */
1734 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1735 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1736 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1737 int chunk);
1738 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1739 ext4_lblk_t iblock, unsigned int max_blocks,
1740 struct buffer_head *bh_result, int flags);
1741 extern void ext4_ext_truncate(struct inode *);
1742 extern void ext4_ext_init(struct super_block *);
1743 extern void ext4_ext_release(struct super_block *);
1744 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1745 loff_t len);
1746 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
1747 loff_t len);
1748 extern int ext4_get_blocks(handle_t *handle, struct inode *inode,
1749 sector_t block, unsigned int max_blocks,
1750 struct buffer_head *bh, int flags);
1751 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1752 __u64 start, __u64 len);
1753 /* move_extent.c */
1754 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
1755 __u64 start_orig, __u64 start_donor,
1756 __u64 len, __u64 *moved_len);
1757
1758
1759 /*
1760 * Add new method to test wether block and inode bitmaps are properly
1761 * initialized. With uninit_bg reading the block from disk is not enough
1762 * to mark the bitmap uptodate. We need to also zero-out the bitmap
1763 */
1764 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1765
1766 static inline int bitmap_uptodate(struct buffer_head *bh)
1767 {
1768 return (buffer_uptodate(bh) &&
1769 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1770 }
1771 static inline void set_bitmap_uptodate(struct buffer_head *bh)
1772 {
1773 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1774 }
1775
1776 #endif /* __KERNEL__ */
1777
1778 #endif /* _EXT4_H */
1779
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