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1/*
2 * linux/include/linux/ext4_fs.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 _LINUX_EXT4_FS_H
17#define _LINUX_EXT4_FS_H
18
19#include <linux/types.h>
20#include <linux/blkdev.h>
21#include <linux/magic.h>
22
23#include <linux/ext4_fs_i.h>
24
25/*
26 * The second extended filesystem constants/structures
27 */
28
29/*
30 * Define EXT4FS_DEBUG to produce debug messages
31 */
32#undef EXT4FS_DEBUG
33
34/*
35 * Define EXT4_RESERVATION to reserve data blocks for expanding files
36 */
37#define EXT4_DEFAULT_RESERVE_BLOCKS 8
38/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
39#define EXT4_MAX_RESERVE_BLOCKS 1027
40#define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
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__, __FUNCTION__); \
50 printk (KERN_DEBUG f, ## a); \
51 } while (0)
52#else
53#define ext4_debug(f, a...) do {} while (0)
54#endif
55
56#define EXT4_MULTIBLOCK_ALLOCATOR 1
57
58/* prefer goal again. length */
59#define EXT4_MB_HINT_MERGE 1
60/* blocks already reserved */
61#define EXT4_MB_HINT_RESERVED 2
62/* metadata is being allocated */
63#define EXT4_MB_HINT_METADATA 4
64/* first blocks in the file */
65#define EXT4_MB_HINT_FIRST 8
66/* search for the best chunk */
67#define EXT4_MB_HINT_BEST 16
68/* data is being allocated */
69#define EXT4_MB_HINT_DATA 32
70/* don't preallocate (for tails) */
71#define EXT4_MB_HINT_NOPREALLOC 64
72/* allocate for locality group */
73#define EXT4_MB_HINT_GROUP_ALLOC 128
74/* allocate goal blocks or none */
75#define EXT4_MB_HINT_GOAL_ONLY 256
76/* goal is meaningful */
77#define EXT4_MB_HINT_TRY_GOAL 512
78
79struct ext4_allocation_request {
80 /* target inode for block we're allocating */
81 struct inode *inode;
82 /* logical block in target inode */
83 ext4_lblk_t logical;
84 /* phys. target (a hint) */
85 ext4_fsblk_t goal;
86 /* the closest logical allocated block to the left */
87 ext4_lblk_t lleft;
88 /* phys. block for ^^^ */
89 ext4_fsblk_t pleft;
90 /* the closest logical allocated block to the right */
91 ext4_lblk_t lright;
92 /* phys. block for ^^^ */
93 ext4_fsblk_t pright;
94 /* how many blocks we want to allocate */
95 unsigned long len;
96 /* flags. see above EXT4_MB_HINT_* */
97 unsigned long flags;
98};
99
100/*
101 * Special inodes numbers
102 */
103#define EXT4_BAD_INO 1 /* Bad blocks inode */
104#define EXT4_ROOT_INO 2 /* Root inode */
105#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
106#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
107#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
108#define EXT4_JOURNAL_INO 8 /* Journal inode */
109
110/* First non-reserved inode for old ext4 filesystems */
111#define EXT4_GOOD_OLD_FIRST_INO 11
112
113/*
114 * Maximal count of links to a file
115 */
116#define EXT4_LINK_MAX 65000
117
118/*
119 * Macro-instructions used to manage several block sizes
120 */
121#define EXT4_MIN_BLOCK_SIZE 1024
122#define EXT4_MAX_BLOCK_SIZE 65536
123#define EXT4_MIN_BLOCK_LOG_SIZE 10
124#ifdef __KERNEL__
125# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
126#else
127# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
128#endif
129#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
130#ifdef __KERNEL__
131# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
132#else
133# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
134#endif
135#ifdef __KERNEL__
136#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
137#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
138#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
139#else
140#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
141 EXT4_GOOD_OLD_INODE_SIZE : \
142 (s)->s_inode_size)
143#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
144 EXT4_GOOD_OLD_FIRST_INO : \
145 (s)->s_first_ino)
146#endif
147#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
148
149/*
150 * Structure of a blocks group descriptor
151 */
152struct ext4_group_desc
153{
154 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
155 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
156 __le32 bg_inode_table_lo; /* Inodes table block */
157 __le16 bg_free_blocks_count; /* Free blocks count */
158 __le16 bg_free_inodes_count; /* Free inodes count */
159 __le16 bg_used_dirs_count; /* Directories count */
160 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
161 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
162 __le16 bg_itable_unused; /* Unused inodes count */
163 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
164 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
165 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
166 __le32 bg_inode_table_hi; /* Inodes table block MSB */
167 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
168 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
169 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
170 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
171 __u32 bg_reserved2[3];
172};
173
174#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
175#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
176#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
177
178#ifdef __KERNEL__
179#include <linux/ext4_fs_i.h>
180#include <linux/ext4_fs_sb.h>
181#endif
182/*
183 * Macro-instructions used to manage group descriptors
184 */
185#define EXT4_MIN_DESC_SIZE 32
186#define EXT4_MIN_DESC_SIZE_64BIT 64
187#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
188#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
189#ifdef __KERNEL__
190# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
191# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
192# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
193# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
194#else
195# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
196# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
197# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
198#endif
199
200/*
201 * Constants relative to the data blocks
202 */
203#define EXT4_NDIR_BLOCKS 12
204#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
205#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
206#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
207#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
208
209/*
210 * Inode flags
211 */
212#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
213#define EXT4_UNRM_FL 0x00000002 /* Undelete */
214#define EXT4_COMPR_FL 0x00000004 /* Compress file */
215#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
216#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
217#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
218#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
219#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
220/* Reserved for compression usage... */
221#define EXT4_DIRTY_FL 0x00000100
222#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
223#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
224#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
225/* End compression flags --- maybe not all used */
226#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
227#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
228#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
229#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
230#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
231#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
232#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
233#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
234#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
235
236#define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
237#define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
238
239/*
240 * Inode dynamic state flags
241 */
242#define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
243#define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
244#define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
245#define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
246
247/* Used to pass group descriptor data when online resize is done */
248struct ext4_new_group_input {
249 __u32 group; /* Group number for this data */
250 __u64 block_bitmap; /* Absolute block number of block bitmap */
251 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
252 __u64 inode_table; /* Absolute block number of inode table start */
253 __u32 blocks_count; /* Total number of blocks in this group */
254 __u16 reserved_blocks; /* Number of reserved blocks in this group */
255 __u16 unused;
256};
257
258/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
259struct ext4_new_group_data {
260 __u32 group;
261 __u64 block_bitmap;
262 __u64 inode_bitmap;
263 __u64 inode_table;
264 __u32 blocks_count;
265 __u16 reserved_blocks;
266 __u16 unused;
267 __u32 free_blocks_count;
268};
269
270/*
271 * Following is used by preallocation code to tell get_blocks() that we
272 * want uninitialzed extents.
273 */
274#define EXT4_CREATE_UNINITIALIZED_EXT 2
275
276/*
277 * ioctl commands
278 */
279#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
280#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
281#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
282#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
283#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
284#define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
285#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
286#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
287#ifdef CONFIG_JBD2_DEBUG
288#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
289#endif
290#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
291#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
292#define EXT4_IOC_MIGRATE _IO('f', 7)
293
294/*
295 * ioctl commands in 32 bit emulation
296 */
297#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
298#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
299#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
300#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
301#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
302#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
303#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
304#ifdef CONFIG_JBD2_DEBUG
305#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
306#endif
307#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
308#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
309
310
311/*
312 * Mount options
313 */
314struct ext4_mount_options {
315 unsigned long s_mount_opt;
316 uid_t s_resuid;
317 gid_t s_resgid;
318 unsigned long s_commit_interval;
319#ifdef CONFIG_QUOTA
320 int s_jquota_fmt;
321 char *s_qf_names[MAXQUOTAS];
322#endif
323};
324
325/*
326 * Structure of an inode on the disk
327 */
328struct ext4_inode {
329 __le16 i_mode; /* File mode */
330 __le16 i_uid; /* Low 16 bits of Owner Uid */
331 __le32 i_size_lo; /* Size in bytes */
332 __le32 i_atime; /* Access time */
333 __le32 i_ctime; /* Inode Change time */
334 __le32 i_mtime; /* Modification time */
335 __le32 i_dtime; /* Deletion Time */
336 __le16 i_gid; /* Low 16 bits of Group Id */
337 __le16 i_links_count; /* Links count */
338 __le32 i_blocks_lo; /* Blocks count */
339 __le32 i_flags; /* File flags */
340 union {
341 struct {
342 __le32 l_i_version;
343 } linux1;
344 struct {
345 __u32 h_i_translator;
346 } hurd1;
347 struct {
348 __u32 m_i_reserved1;
349 } masix1;
350 } osd1; /* OS dependent 1 */
351 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
352 __le32 i_generation; /* File version (for NFS) */
353 __le32 i_file_acl_lo; /* File ACL */
354 __le32 i_size_high;
355 __le32 i_obso_faddr; /* Obsoleted fragment address */
356 union {
357 struct {
358 __le16 l_i_blocks_high; /* were l_i_reserved1 */
359 __le16 l_i_file_acl_high;
360 __le16 l_i_uid_high; /* these 2 fields */
361 __le16 l_i_gid_high; /* were reserved2[0] */
362 __u32 l_i_reserved2;
363 } linux2;
364 struct {
365 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
366 __u16 h_i_mode_high;
367 __u16 h_i_uid_high;
368 __u16 h_i_gid_high;
369 __u32 h_i_author;
370 } hurd2;
371 struct {
372 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
373 __le16 m_i_file_acl_high;
374 __u32 m_i_reserved2[2];
375 } masix2;
376 } osd2; /* OS dependent 2 */
377 __le16 i_extra_isize;
378 __le16 i_pad1;
379 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
380 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
381 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
382 __le32 i_crtime; /* File Creation time */
383 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
384 __le32 i_version_hi; /* high 32 bits for 64-bit version */
385};
386
387
388#define EXT4_EPOCH_BITS 2
389#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
390#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
391
392/*
393 * Extended fields will fit into an inode if the filesystem was formatted
394 * with large inodes (-I 256 or larger) and there are not currently any EAs
395 * consuming all of the available space. For new inodes we always reserve
396 * enough space for the kernel's known extended fields, but for inodes
397 * created with an old kernel this might not have been the case. None of
398 * the extended inode fields is critical for correct filesystem operation.
399 * This macro checks if a certain field fits in the inode. Note that
400 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
401 */
402#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
403 ((offsetof(typeof(*ext4_inode), field) + \
404 sizeof((ext4_inode)->field)) \
405 <= (EXT4_GOOD_OLD_INODE_SIZE + \
406 (einode)->i_extra_isize)) \
407
408static inline __le32 ext4_encode_extra_time(struct timespec *time)
409{
410 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
411 time->tv_sec >> 32 : 0) |
412 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
413}
414
415static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
416{
417 if (sizeof(time->tv_sec) > 4)
418 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
419 << 32;
420 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
421}
422
423#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
424do { \
425 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
426 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
427 (raw_inode)->xtime ## _extra = \
428 ext4_encode_extra_time(&(inode)->xtime); \
429} while (0)
430
431#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
432do { \
433 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
434 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
435 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
436 (raw_inode)->xtime ## _extra = \
437 ext4_encode_extra_time(&(einode)->xtime); \
438} while (0)
439
440#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
441do { \
442 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
443 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
444 ext4_decode_extra_time(&(inode)->xtime, \
445 raw_inode->xtime ## _extra); \
446} while (0)
447
448#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
449do { \
450 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
451 (einode)->xtime.tv_sec = \
452 (signed)le32_to_cpu((raw_inode)->xtime); \
453 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
454 ext4_decode_extra_time(&(einode)->xtime, \
455 raw_inode->xtime ## _extra); \
456} while (0)
457
458#define i_disk_version osd1.linux1.l_i_version
459
460#if defined(__KERNEL__) || defined(__linux__)
461#define i_reserved1 osd1.linux1.l_i_reserved1
462#define i_file_acl_high osd2.linux2.l_i_file_acl_high
463#define i_blocks_high osd2.linux2.l_i_blocks_high
464#define i_uid_low i_uid
465#define i_gid_low i_gid
466#define i_uid_high osd2.linux2.l_i_uid_high
467#define i_gid_high osd2.linux2.l_i_gid_high
468#define i_reserved2 osd2.linux2.l_i_reserved2
469
470#elif defined(__GNU__)
471
472#define i_translator osd1.hurd1.h_i_translator
473#define i_uid_high osd2.hurd2.h_i_uid_high
474#define i_gid_high osd2.hurd2.h_i_gid_high
475#define i_author osd2.hurd2.h_i_author
476
477#elif defined(__masix__)
478
479#define i_reserved1 osd1.masix1.m_i_reserved1
480#define i_file_acl_high osd2.masix2.m_i_file_acl_high
481#define i_reserved2 osd2.masix2.m_i_reserved2
482
483#endif /* defined(__KERNEL__) || defined(__linux__) */
484
485/*
486 * File system states
487 */
488#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
489#define EXT4_ERROR_FS 0x0002 /* Errors detected */
490#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
491
492/*
493 * Misc. filesystem flags
494 */
495#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
496#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
497#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
498
499/*
500 * Mount flags
501 */
502#define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
503#define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
504#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
505#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
506#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
507#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
508#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
509#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
510#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
511#define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
512#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
513#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
514#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
515#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
516#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
517#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
518#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
519#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
520#define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
521#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
522#define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
523#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
524#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
525#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
526#define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
527#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
528#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
529#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
530#define EXT4_MOUNT_MBALLOC 0x4000000 /* Buddy allocation support */
531/* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
532#ifndef _LINUX_EXT2_FS_H
533#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
534#define set_opt(o, opt) o |= EXT4_MOUNT_##opt
535#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
536 EXT4_MOUNT_##opt)
537#else
538#define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
539#define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
540#define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
541#endif
542
543#define ext4_set_bit ext2_set_bit
544#define ext4_set_bit_atomic ext2_set_bit_atomic
545#define ext4_clear_bit ext2_clear_bit
546#define ext4_clear_bit_atomic ext2_clear_bit_atomic
547#define ext4_test_bit ext2_test_bit
548#define ext4_find_first_zero_bit ext2_find_first_zero_bit
549#define ext4_find_next_zero_bit ext2_find_next_zero_bit
550#define ext4_find_next_bit ext2_find_next_bit
551
552/*
553 * Maximal mount counts between two filesystem checks
554 */
555#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
556#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
557
558/*
559 * Behaviour when detecting errors
560 */
561#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
562#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
563#define EXT4_ERRORS_PANIC 3 /* Panic */
564#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
565
566/*
567 * Structure of the super block
568 */
569struct ext4_super_block {
570/*00*/ __le32 s_inodes_count; /* Inodes count */
571 __le32 s_blocks_count_lo; /* Blocks count */
572 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
573 __le32 s_free_blocks_count_lo; /* Free blocks count */
574/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
575 __le32 s_first_data_block; /* First Data Block */
576 __le32 s_log_block_size; /* Block size */
577 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
578/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
579 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
580 __le32 s_inodes_per_group; /* # Inodes per group */
581 __le32 s_mtime; /* Mount time */
582/*30*/ __le32 s_wtime; /* Write time */
583 __le16 s_mnt_count; /* Mount count */
584 __le16 s_max_mnt_count; /* Maximal mount count */
585 __le16 s_magic; /* Magic signature */
586 __le16 s_state; /* File system state */
587 __le16 s_errors; /* Behaviour when detecting errors */
588 __le16 s_minor_rev_level; /* minor revision level */
589/*40*/ __le32 s_lastcheck; /* time of last check */
590 __le32 s_checkinterval; /* max. time between checks */
591 __le32 s_creator_os; /* OS */
592 __le32 s_rev_level; /* Revision level */
593/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
594 __le16 s_def_resgid; /* Default gid for reserved blocks */
595 /*
596 * These fields are for EXT4_DYNAMIC_REV superblocks only.
597 *
598 * Note: the difference between the compatible feature set and
599 * the incompatible feature set is that if there is a bit set
600 * in the incompatible feature set that the kernel doesn't
601 * know about, it should refuse to mount the filesystem.
602 *
603 * e2fsck's requirements are more strict; if it doesn't know
604 * about a feature in either the compatible or incompatible
605 * feature set, it must abort and not try to meddle with
606 * things it doesn't understand...
607 */
608 __le32 s_first_ino; /* First non-reserved inode */
609 __le16 s_inode_size; /* size of inode structure */
610 __le16 s_block_group_nr; /* block group # of this superblock */
611 __le32 s_feature_compat; /* compatible feature set */
612/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
613 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
614/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
615/*78*/ char s_volume_name[16]; /* volume name */
616/*88*/ char s_last_mounted[64]; /* directory where last mounted */
617/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
618 /*
619 * Performance hints. Directory preallocation should only
620 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
621 */
622 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
623 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
624 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
625 /*
626 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
627 */
628/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
629/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
630 __le32 s_journal_dev; /* device number of journal file */
631 __le32 s_last_orphan; /* start of list of inodes to delete */
632 __le32 s_hash_seed[4]; /* HTREE hash seed */
633 __u8 s_def_hash_version; /* Default hash version to use */
634 __u8 s_reserved_char_pad;
635 __le16 s_desc_size; /* size of group descriptor */
636/*100*/ __le32 s_default_mount_opts;
637 __le32 s_first_meta_bg; /* First metablock block group */
638 __le32 s_mkfs_time; /* When the filesystem was created */
639 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
640 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
641/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
642 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
643 __le32 s_free_blocks_count_hi; /* Free blocks count */
644 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
645 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
646 __le32 s_flags; /* Miscellaneous flags */
647 __le16 s_raid_stride; /* RAID stride */
648 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
649 __le64 s_mmp_block; /* Block for multi-mount protection */
650 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
651 __u32 s_reserved[163]; /* Padding to the end of the block */
652};
653
654#ifdef __KERNEL__
655static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
656{
657 return sb->s_fs_info;
658}
659static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
660{
661 return container_of(inode, struct ext4_inode_info, vfs_inode);
662}
663
664static inline struct timespec ext4_current_time(struct inode *inode)
665{
666 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
667 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
668}
669
670
671static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
672{
673 return ino == EXT4_ROOT_INO ||
674 ino == EXT4_JOURNAL_INO ||
675 ino == EXT4_RESIZE_INO ||
676 (ino >= EXT4_FIRST_INO(sb) &&
677 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
678}
679#else
680/* Assume that user mode programs are passing in an ext4fs superblock, not
681 * a kernel struct super_block. This will allow us to call the feature-test
682 * macros from user land. */
683#define EXT4_SB(sb) (sb)
684#endif
685
686#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
687
688/*
689 * Codes for operating systems
690 */
691#define EXT4_OS_LINUX 0
692#define EXT4_OS_HURD 1
693#define EXT4_OS_MASIX 2
694#define EXT4_OS_FREEBSD 3
695#define EXT4_OS_LITES 4
696
697/*
698 * Revision levels
699 */
700#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
701#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
702
703#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
704#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
705
706#define EXT4_GOOD_OLD_INODE_SIZE 128
707
708/*
709 * Feature set definitions
710 */
711
712#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
713 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
714#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
715 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
716#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
717 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
718#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
719 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
720#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
721 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
722#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
723 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
724#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
725 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
726#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
727 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
728#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
729 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
730
731#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
732#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
733#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
734#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
735#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
736#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
737
738#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
739#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
740#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
741#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
742#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
743#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
744#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
745
746#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
747#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
748#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
749#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
750#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
751#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
752#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
753#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
754#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
755
756#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
757#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
758 EXT4_FEATURE_INCOMPAT_RECOVER| \
759 EXT4_FEATURE_INCOMPAT_META_BG| \
760 EXT4_FEATURE_INCOMPAT_EXTENTS| \
761 EXT4_FEATURE_INCOMPAT_64BIT| \
762 EXT4_FEATURE_INCOMPAT_FLEX_BG)
763#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
764 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
765 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
766 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
767 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
768 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
769 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
770
771/*
772 * Default values for user and/or group using reserved blocks
773 */
774#define EXT4_DEF_RESUID 0
775#define EXT4_DEF_RESGID 0
776
777/*
778 * Default mount options
779 */
780#define EXT4_DEFM_DEBUG 0x0001
781#define EXT4_DEFM_BSDGROUPS 0x0002
782#define EXT4_DEFM_XATTR_USER 0x0004
783#define EXT4_DEFM_ACL 0x0008
784#define EXT4_DEFM_UID16 0x0010
785#define EXT4_DEFM_JMODE 0x0060
786#define EXT4_DEFM_JMODE_DATA 0x0020
787#define EXT4_DEFM_JMODE_ORDERED 0x0040
788#define EXT4_DEFM_JMODE_WBACK 0x0060
789
790/*
791 * Structure of a directory entry
792 */
793#define EXT4_NAME_LEN 255
794
795struct ext4_dir_entry {
796 __le32 inode; /* Inode number */
797 __le16 rec_len; /* Directory entry length */
798 __le16 name_len; /* Name length */
799 char name[EXT4_NAME_LEN]; /* File name */
800};
801
802/*
803 * The new version of the directory entry. Since EXT4 structures are
804 * stored in intel byte order, and the name_len field could never be
805 * bigger than 255 chars, it's safe to reclaim the extra byte for the
806 * file_type field.
807 */
808struct ext4_dir_entry_2 {
809 __le32 inode; /* Inode number */
810 __le16 rec_len; /* Directory entry length */
811 __u8 name_len; /* Name length */
812 __u8 file_type;
813 char name[EXT4_NAME_LEN]; /* File name */
814};
815
816/*
817 * Ext4 directory file types. Only the low 3 bits are used. The
818 * other bits are reserved for now.
819 */
820#define EXT4_FT_UNKNOWN 0
821#define EXT4_FT_REG_FILE 1
822#define EXT4_FT_DIR 2
823#define EXT4_FT_CHRDEV 3
824#define EXT4_FT_BLKDEV 4
825#define EXT4_FT_FIFO 5
826#define EXT4_FT_SOCK 6
827#define EXT4_FT_SYMLINK 7
828
829#define EXT4_FT_MAX 8
830
831/*
832 * EXT4_DIR_PAD defines the directory entries boundaries
833 *
834 * NOTE: It must be a multiple of 4
835 */
836#define EXT4_DIR_PAD 4
837#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
838#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
839 ~EXT4_DIR_ROUND)
840#define EXT4_MAX_REC_LEN ((1<<16)-1)
841
842static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
843{
844 unsigned len = le16_to_cpu(dlen);
845
846 if (len == EXT4_MAX_REC_LEN)
847 return 1 << 16;
848 return len;
849}
850
851static inline __le16 ext4_rec_len_to_disk(unsigned len)
852{
853 if (len == (1 << 16))
854 return cpu_to_le16(EXT4_MAX_REC_LEN);
855 else if (len > (1 << 16))
856 BUG();
857 return cpu_to_le16(len);
858}
859
860/*
861 * Hash Tree Directory indexing
862 * (c) Daniel Phillips, 2001
863 */
864
865#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
866 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
867 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
868#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
869#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
870
871/* Legal values for the dx_root hash_version field: */
872
873#define DX_HASH_LEGACY 0
874#define DX_HASH_HALF_MD4 1
875#define DX_HASH_TEA 2
876
877#ifdef __KERNEL__
878
879/* hash info structure used by the directory hash */
880struct dx_hash_info
881{
882 u32 hash;
883 u32 minor_hash;
884 int hash_version;
885 u32 *seed;
886};
887
888#define EXT4_HTREE_EOF 0x7fffffff
889
890/*
891 * Control parameters used by ext4_htree_next_block
892 */
893#define HASH_NB_ALWAYS 1
894
895
896/*
897 * Describe an inode's exact location on disk and in memory
898 */
899struct ext4_iloc
900{
901 struct buffer_head *bh;
902 unsigned long offset;
903 ext4_group_t block_group;
904};
905
906static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
907{
908 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
909}
910
911/*
912 * This structure is stuffed into the struct file's private_data field
913 * for directories. It is where we put information so that we can do
914 * readdir operations in hash tree order.
915 */
916struct dir_private_info {
917 struct rb_root root;
918 struct rb_node *curr_node;
919 struct fname *extra_fname;
920 loff_t last_pos;
921 __u32 curr_hash;
922 __u32 curr_minor_hash;
923 __u32 next_hash;
924};
925
926/* calculate the first block number of the group */
927static inline ext4_fsblk_t
928ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
929{
930 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
931 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
932}
933
934/*
935 * Special error return code only used by dx_probe() and its callers.
936 */
937#define ERR_BAD_DX_DIR -75000
938
939void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
940 unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
941
942/*
943 * Function prototypes
944 */
945
946/*
947 * Ok, these declarations are also in <linux/kernel.h> but none of the
948 * ext4 source programs needs to include it so they are duplicated here.
949 */
950# define NORET_TYPE /**/
951# define ATTRIB_NORET __attribute__((noreturn))
952# define NORET_AND noreturn,
953
954/* balloc.c */
955extern unsigned int ext4_block_group(struct super_block *sb,
956 ext4_fsblk_t blocknr);
957extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
958 ext4_fsblk_t blocknr);
959extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
960extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
961 ext4_group_t group);
962extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
963 ext4_fsblk_t goal, int *errp);
964extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
965 ext4_fsblk_t goal, unsigned long *count, int *errp);
966extern ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
967 ext4_fsblk_t goal, unsigned long *count, int *errp);
968extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
969 ext4_fsblk_t block, unsigned long count, int metadata);
970extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
971 ext4_fsblk_t block, unsigned long count,
972 unsigned long *pdquot_freed_blocks);
973extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
974extern void ext4_check_blocks_bitmap (struct super_block *);
975extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
976 ext4_group_t block_group,
977 struct buffer_head ** bh);
978extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
979extern void ext4_init_block_alloc_info(struct inode *);
980extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
981
982/* dir.c */
983extern int ext4_check_dir_entry(const char *, struct inode *,
984 struct ext4_dir_entry_2 *,
985 struct buffer_head *, unsigned long);
986extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
987 __u32 minor_hash,
988 struct ext4_dir_entry_2 *dirent);
989extern void ext4_htree_free_dir_info(struct dir_private_info *p);
990
991/* fsync.c */
992extern int ext4_sync_file (struct file *, struct dentry *, int);
993
994/* hash.c */
995extern int ext4fs_dirhash(const char *name, int len, struct
996 dx_hash_info *hinfo);
997
998/* ialloc.c */
999extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
1000extern void ext4_free_inode (handle_t *, struct inode *);
1001extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
1002extern unsigned long ext4_count_free_inodes (struct super_block *);
1003extern unsigned long ext4_count_dirs (struct super_block *);
1004extern void ext4_check_inodes_bitmap (struct super_block *);
1005extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
1006
1007/* mballoc.c */
1008extern long ext4_mb_stats;
1009extern long ext4_mb_max_to_scan;
1010extern int ext4_mb_init(struct super_block *, int);
1011extern int ext4_mb_release(struct super_block *);
1012extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1013 struct ext4_allocation_request *, int *);
1014extern int ext4_mb_reserve_blocks(struct super_block *, int);
1015extern void ext4_mb_discard_inode_preallocations(struct inode *);
1016extern int __init init_ext4_mballoc(void);
1017extern void exit_ext4_mballoc(void);
1018extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1019 unsigned long, unsigned long, int, unsigned long *);
1020
1021
1022/* inode.c */
1023int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1024 struct buffer_head *bh, ext4_fsblk_t blocknr);
1025struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1026 ext4_lblk_t, int, int *);
1027struct buffer_head *ext4_bread(handle_t *, struct inode *,
1028 ext4_lblk_t, int, int *);
1029int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
1030 ext4_lblk_t iblock, unsigned long maxblocks,
1031 struct buffer_head *bh_result,
1032 int create, int extend_disksize);
1033
1034extern struct inode *ext4_iget(struct super_block *, unsigned long);
1035extern int ext4_write_inode (struct inode *, int);
1036extern int ext4_setattr (struct dentry *, struct iattr *);
1037extern void ext4_delete_inode (struct inode *);
1038extern int ext4_sync_inode (handle_t *, struct inode *);
1039extern void ext4_discard_reservation (struct inode *);
1040extern void ext4_dirty_inode(struct inode *);
1041extern int ext4_change_inode_journal_flag(struct inode *, int);
1042extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1043extern void ext4_truncate (struct inode *);
1044extern void ext4_set_inode_flags(struct inode *);
1045extern void ext4_get_inode_flags(struct ext4_inode_info *);
1046extern void ext4_set_aops(struct inode *inode);
1047extern int ext4_writepage_trans_blocks(struct inode *);
1048extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
1049 struct address_space *mapping, loff_t from);
1050
1051/* ioctl.c */
1052extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
1053 unsigned long);
1054extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
1055
1056/* migrate.c */
1057extern int ext4_ext_migrate(struct inode *, struct file *, unsigned int,
1058 unsigned long);
1059/* namei.c */
1060extern int ext4_orphan_add(handle_t *, struct inode *);
1061extern int ext4_orphan_del(handle_t *, struct inode *);
1062extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1063 __u32 start_minor_hash, __u32 *next_hash);
1064
1065/* resize.c */
1066extern int ext4_group_add(struct super_block *sb,
1067 struct ext4_new_group_data *input);
1068extern int ext4_group_extend(struct super_block *sb,
1069 struct ext4_super_block *es,
1070 ext4_fsblk_t n_blocks_count);
1071
1072/* super.c */
1073extern void ext4_error (struct super_block *, const char *, const char *, ...)
1074 __attribute__ ((format (printf, 3, 4)));
1075extern void __ext4_std_error (struct super_block *, const char *, int);
1076extern void ext4_abort (struct super_block *, const char *, const char *, ...)
1077 __attribute__ ((format (printf, 3, 4)));
1078extern void ext4_warning (struct super_block *, const char *, const char *, ...)
1079 __attribute__ ((format (printf, 3, 4)));
1080extern void ext4_update_dynamic_rev (struct super_block *sb);
1081extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1082 __u32 compat);
1083extern int ext4_update_rocompat_feature(handle_t *handle,
1084 struct super_block *sb, __u32 rocompat);
1085extern int ext4_update_incompat_feature(handle_t *handle,
1086 struct super_block *sb, __u32 incompat);
1087extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1088 struct ext4_group_desc *bg);
1089extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1090 struct ext4_group_desc *bg);
1091extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1092 struct ext4_group_desc *bg);
1093extern void ext4_block_bitmap_set(struct super_block *sb,
1094 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1095extern void ext4_inode_bitmap_set(struct super_block *sb,
1096 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1097extern void ext4_inode_table_set(struct super_block *sb,
1098 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1099
1100static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1101{
1102 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1103 le32_to_cpu(es->s_blocks_count_lo);
1104}
1105
1106static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1107{
1108 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1109 le32_to_cpu(es->s_r_blocks_count_lo);
1110}
1111
1112static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1113{
1114 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1115 le32_to_cpu(es->s_free_blocks_count_lo);
1116}
1117
1118static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1119 ext4_fsblk_t blk)
1120{
1121 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1122 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1123}
1124
1125static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1126 ext4_fsblk_t blk)
1127{
1128 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1129 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1130}
1131
1132static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1133 ext4_fsblk_t blk)
1134{
1135 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1136 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1137}
1138
1139static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1140{
1141 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1142 le32_to_cpu(raw_inode->i_size_lo);
1143}
1144
1145static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1146{
1147 raw_inode->i_size_lo = cpu_to_le32(i_size);
1148 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1149}
1150
1151static inline
1152struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1153 ext4_group_t group)
1154{
1155 struct ext4_group_info ***grp_info;
1156 long indexv, indexh;
1157 grp_info = EXT4_SB(sb)->s_group_info;
1158 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1159 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1160 return grp_info[indexv][indexh];
1161}
1162
1163
1164#define ext4_std_error(sb, errno) \
1165do { \
1166 if ((errno)) \
1167 __ext4_std_error((sb), __FUNCTION__, (errno)); \
1168} while (0)
1169
1170/*
1171 * Inodes and files operations
1172 */
1173
1174/* dir.c */
1175extern const struct file_operations ext4_dir_operations;
1176
1177/* file.c */
1178extern const struct inode_operations ext4_file_inode_operations;
1179extern const struct file_operations ext4_file_operations;
1180
1181/* namei.c */
1182extern const struct inode_operations ext4_dir_inode_operations;
1183extern const struct inode_operations ext4_special_inode_operations;
1184
1185/* symlink.c */
1186extern const struct inode_operations ext4_symlink_inode_operations;
1187extern const struct inode_operations ext4_fast_symlink_inode_operations;
1188
1189/* extents.c */
1190extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1191extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1192extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1193 ext4_lblk_t iblock,
1194 unsigned long max_blocks, struct buffer_head *bh_result,
1195 int create, int extend_disksize);
1196extern void ext4_ext_truncate(struct inode *, struct page *);
1197extern void ext4_ext_init(struct super_block *);
1198extern void ext4_ext_release(struct super_block *);
1199extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1200 loff_t len);
1201extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1202 sector_t block, unsigned long max_blocks,
1203 struct buffer_head *bh, int create,
1204 int extend_disksize);
1205#endif /* __KERNEL__ */
1206
1207#endif /* _LINUX_EXT4_FS_H */