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authorChristoph Hellwig <hch@lst.de>2008-04-29 18:13:32 -0400
committerTheodore Ts'o <tytso@mit.edu>2008-04-29 18:13:32 -0400
commit3dcf54515aa4981a647ad74859199032965193a5 (patch)
treeb95d895bb2f6fa15be29411b15d538c21b0de930 /include
parent216553c4b7f3e3e2beb4981cddca9b2027523928 (diff)
ext4: move headers out of include/linux
Move ext4 headers out of include/linux. This is just the trivial move, there's some more thing that could be done later. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'include')
-rw-r--r--include/linux/ext4_fs.h1205
-rw-r--r--include/linux/ext4_fs_extents.h232
-rw-r--r--include/linux/ext4_fs_i.h167
-rw-r--r--include/linux/ext4_fs_sb.h148
-rw-r--r--include/linux/ext4_jbd2.h231
5 files changed, 0 insertions, 1983 deletions
diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h
deleted file mode 100644
index 1ae0f965f386..000000000000
--- a/include/linux/ext4_fs.h
+++ /dev/null
@@ -1,1205 +0,0 @@
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#include <linux/ext4_fs_i.h>
23
24/*
25 * The second extended filesystem constants/structures
26 */
27
28/*
29 * Define EXT4FS_DEBUG to produce debug messages
30 */
31#undef EXT4FS_DEBUG
32
33/*
34 * Define EXT4_RESERVATION to reserve data blocks for expanding files
35 */
36#define EXT4_DEFAULT_RESERVE_BLOCKS 8
37/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
38#define EXT4_MAX_RESERVE_BLOCKS 1027
39#define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
40
41/*
42 * Debug code
43 */
44#ifdef EXT4FS_DEBUG
45#define ext4_debug(f, a...) \
46 do { \
47 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
48 __FILE__, __LINE__, __FUNCTION__); \
49 printk (KERN_DEBUG f, ## a); \
50 } while (0)
51#else
52#define ext4_debug(f, a...) do {} while (0)
53#endif
54
55#define EXT4_MULTIBLOCK_ALLOCATOR 1
56
57/* prefer goal again. length */
58#define EXT4_MB_HINT_MERGE 1
59/* blocks already reserved */
60#define EXT4_MB_HINT_RESERVED 2
61/* metadata is being allocated */
62#define EXT4_MB_HINT_METADATA 4
63/* first blocks in the file */
64#define EXT4_MB_HINT_FIRST 8
65/* search for the best chunk */
66#define EXT4_MB_HINT_BEST 16
67/* data is being allocated */
68#define EXT4_MB_HINT_DATA 32
69/* don't preallocate (for tails) */
70#define EXT4_MB_HINT_NOPREALLOC 64
71/* allocate for locality group */
72#define EXT4_MB_HINT_GROUP_ALLOC 128
73/* allocate goal blocks or none */
74#define EXT4_MB_HINT_GOAL_ONLY 256
75/* goal is meaningful */
76#define EXT4_MB_HINT_TRY_GOAL 512
77
78struct ext4_allocation_request {
79 /* target inode for block we're allocating */
80 struct inode *inode;
81 /* logical block in target inode */
82 ext4_lblk_t logical;
83 /* phys. target (a hint) */
84 ext4_fsblk_t goal;
85 /* the closest logical allocated block to the left */
86 ext4_lblk_t lleft;
87 /* phys. block for ^^^ */
88 ext4_fsblk_t pleft;
89 /* the closest logical allocated block to the right */
90 ext4_lblk_t lright;
91 /* phys. block for ^^^ */
92 ext4_fsblk_t pright;
93 /* how many blocks we want to allocate */
94 unsigned long len;
95 /* flags. see above EXT4_MB_HINT_* */
96 unsigned long flags;
97};
98
99/*
100 * Special inodes numbers
101 */
102#define EXT4_BAD_INO 1 /* Bad blocks inode */
103#define EXT4_ROOT_INO 2 /* Root inode */
104#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
105#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
106#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
107#define EXT4_JOURNAL_INO 8 /* Journal inode */
108
109/* First non-reserved inode for old ext4 filesystems */
110#define EXT4_GOOD_OLD_FIRST_INO 11
111
112/*
113 * Maximal count of links to a file
114 */
115#define EXT4_LINK_MAX 65000
116
117/*
118 * Macro-instructions used to manage several block sizes
119 */
120#define EXT4_MIN_BLOCK_SIZE 1024
121#define EXT4_MAX_BLOCK_SIZE 65536
122#define EXT4_MIN_BLOCK_LOG_SIZE 10
123#ifdef __KERNEL__
124# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
125#else
126# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
127#endif
128#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
129#ifdef __KERNEL__
130# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
131#else
132# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
133#endif
134#ifdef __KERNEL__
135#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
136#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
137#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
138#else
139#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
140 EXT4_GOOD_OLD_INODE_SIZE : \
141 (s)->s_inode_size)
142#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
143 EXT4_GOOD_OLD_FIRST_INO : \
144 (s)->s_first_ino)
145#endif
146#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
147
148/*
149 * Structure of a blocks group descriptor
150 */
151struct ext4_group_desc
152{
153 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
154 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
155 __le32 bg_inode_table_lo; /* Inodes table block */
156 __le16 bg_free_blocks_count; /* Free blocks count */
157 __le16 bg_free_inodes_count; /* Free inodes count */
158 __le16 bg_used_dirs_count; /* Directories count */
159 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
160 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
161 __le16 bg_itable_unused; /* Unused inodes count */
162 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
163 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
164 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
165 __le32 bg_inode_table_hi; /* Inodes table block MSB */
166 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
167 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
168 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
169 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
170 __u32 bg_reserved2[3];
171};
172
173#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
174#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
175#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
176
177#ifdef __KERNEL__
178#include <linux/ext4_fs_sb.h>
179#endif
180/*
181 * Macro-instructions used to manage group descriptors
182 */
183#define EXT4_MIN_DESC_SIZE 32
184#define EXT4_MIN_DESC_SIZE_64BIT 64
185#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
186#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
187#ifdef __KERNEL__
188# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
189# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
190# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
191# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
192#else
193# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
194# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
195# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
196#endif
197
198/*
199 * Constants relative to the data blocks
200 */
201#define EXT4_NDIR_BLOCKS 12
202#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
203#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
204#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
205#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
206
207/*
208 * Inode flags
209 */
210#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
211#define EXT4_UNRM_FL 0x00000002 /* Undelete */
212#define EXT4_COMPR_FL 0x00000004 /* Compress file */
213#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
214#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
215#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
216#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
217#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
218/* Reserved for compression usage... */
219#define EXT4_DIRTY_FL 0x00000100
220#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
221#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
222#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
223/* End compression flags --- maybe not all used */
224#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
225#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
226#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
227#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
228#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
229#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
230#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
231#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
232#define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */
233#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
234
235#define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
236#define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
237
238/*
239 * Inode dynamic state flags
240 */
241#define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
242#define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
243#define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
244#define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
245
246/* Used to pass group descriptor data when online resize is done */
247struct ext4_new_group_input {
248 __u32 group; /* Group number for this data */
249 __u64 block_bitmap; /* Absolute block number of block bitmap */
250 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
251 __u64 inode_table; /* Absolute block number of inode table start */
252 __u32 blocks_count; /* Total number of blocks in this group */
253 __u16 reserved_blocks; /* Number of reserved blocks in this group */
254 __u16 unused;
255};
256
257/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
258struct ext4_new_group_data {
259 __u32 group;
260 __u64 block_bitmap;
261 __u64 inode_bitmap;
262 __u64 inode_table;
263 __u32 blocks_count;
264 __u16 reserved_blocks;
265 __u16 unused;
266 __u32 free_blocks_count;
267};
268
269/*
270 * Following is used by preallocation code to tell get_blocks() that we
271 * want uninitialzed extents.
272 */
273#define EXT4_CREATE_UNINITIALIZED_EXT 2
274
275/*
276 * ioctl commands
277 */
278#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
279#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
280#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
281#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
282#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
283#define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
284#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
285#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
286#ifdef CONFIG_JBD2_DEBUG
287#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
288#endif
289#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
290#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
291#define EXT4_IOC_MIGRATE _IO('f', 7)
292
293/*
294 * ioctl commands in 32 bit emulation
295 */
296#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
297#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
298#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
299#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
300#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
301#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
302#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
303#ifdef CONFIG_JBD2_DEBUG
304#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
305#endif
306#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
307#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
308
309
310/*
311 * Mount options
312 */
313struct ext4_mount_options {
314 unsigned long s_mount_opt;
315 uid_t s_resuid;
316 gid_t s_resgid;
317 unsigned long s_commit_interval;
318#ifdef CONFIG_QUOTA
319 int s_jquota_fmt;
320 char *s_qf_names[MAXQUOTAS];
321#endif
322};
323
324/*
325 * Structure of an inode on the disk
326 */
327struct ext4_inode {
328 __le16 i_mode; /* File mode */
329 __le16 i_uid; /* Low 16 bits of Owner Uid */
330 __le32 i_size_lo; /* Size in bytes */
331 __le32 i_atime; /* Access time */
332 __le32 i_ctime; /* Inode Change time */
333 __le32 i_mtime; /* Modification time */
334 __le32 i_dtime; /* Deletion Time */
335 __le16 i_gid; /* Low 16 bits of Group Id */
336 __le16 i_links_count; /* Links count */
337 __le32 i_blocks_lo; /* Blocks count */
338 __le32 i_flags; /* File flags */
339 union {
340 struct {
341 __le32 l_i_version;
342 } linux1;
343 struct {
344 __u32 h_i_translator;
345 } hurd1;
346 struct {
347 __u32 m_i_reserved1;
348 } masix1;
349 } osd1; /* OS dependent 1 */
350 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
351 __le32 i_generation; /* File version (for NFS) */
352 __le32 i_file_acl_lo; /* File ACL */
353 __le32 i_size_high;
354 __le32 i_obso_faddr; /* Obsoleted fragment address */
355 union {
356 struct {
357 __le16 l_i_blocks_high; /* were l_i_reserved1 */
358 __le16 l_i_file_acl_high;
359 __le16 l_i_uid_high; /* these 2 fields */
360 __le16 l_i_gid_high; /* were reserved2[0] */
361 __u32 l_i_reserved2;
362 } linux2;
363 struct {
364 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
365 __u16 h_i_mode_high;
366 __u16 h_i_uid_high;
367 __u16 h_i_gid_high;
368 __u32 h_i_author;
369 } hurd2;
370 struct {
371 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
372 __le16 m_i_file_acl_high;
373 __u32 m_i_reserved2[2];
374 } masix2;
375 } osd2; /* OS dependent 2 */
376 __le16 i_extra_isize;
377 __le16 i_pad1;
378 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
379 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
380 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
381 __le32 i_crtime; /* File Creation time */
382 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
383 __le32 i_version_hi; /* high 32 bits for 64-bit version */
384};
385
386
387#define EXT4_EPOCH_BITS 2
388#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
389#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
390
391/*
392 * Extended fields will fit into an inode if the filesystem was formatted
393 * with large inodes (-I 256 or larger) and there are not currently any EAs
394 * consuming all of the available space. For new inodes we always reserve
395 * enough space for the kernel's known extended fields, but for inodes
396 * created with an old kernel this might not have been the case. None of
397 * the extended inode fields is critical for correct filesystem operation.
398 * This macro checks if a certain field fits in the inode. Note that
399 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
400 */
401#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
402 ((offsetof(typeof(*ext4_inode), field) + \
403 sizeof((ext4_inode)->field)) \
404 <= (EXT4_GOOD_OLD_INODE_SIZE + \
405 (einode)->i_extra_isize)) \
406
407static inline __le32 ext4_encode_extra_time(struct timespec *time)
408{
409 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
410 time->tv_sec >> 32 : 0) |
411 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
412}
413
414static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
415{
416 if (sizeof(time->tv_sec) > 4)
417 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
418 << 32;
419 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
420}
421
422#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
423do { \
424 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
425 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
426 (raw_inode)->xtime ## _extra = \
427 ext4_encode_extra_time(&(inode)->xtime); \
428} while (0)
429
430#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
431do { \
432 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
433 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
434 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
435 (raw_inode)->xtime ## _extra = \
436 ext4_encode_extra_time(&(einode)->xtime); \
437} while (0)
438
439#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
440do { \
441 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
442 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
443 ext4_decode_extra_time(&(inode)->xtime, \
444 raw_inode->xtime ## _extra); \
445} while (0)
446
447#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
448do { \
449 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
450 (einode)->xtime.tv_sec = \
451 (signed)le32_to_cpu((raw_inode)->xtime); \
452 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
453 ext4_decode_extra_time(&(einode)->xtime, \
454 raw_inode->xtime ## _extra); \
455} while (0)
456
457#define i_disk_version osd1.linux1.l_i_version
458
459#if defined(__KERNEL__) || defined(__linux__)
460#define i_reserved1 osd1.linux1.l_i_reserved1
461#define i_file_acl_high osd2.linux2.l_i_file_acl_high
462#define i_blocks_high osd2.linux2.l_i_blocks_high
463#define i_uid_low i_uid
464#define i_gid_low i_gid
465#define i_uid_high osd2.linux2.l_i_uid_high
466#define i_gid_high osd2.linux2.l_i_gid_high
467#define i_reserved2 osd2.linux2.l_i_reserved2
468
469#elif defined(__GNU__)
470
471#define i_translator osd1.hurd1.h_i_translator
472#define i_uid_high osd2.hurd2.h_i_uid_high
473#define i_gid_high osd2.hurd2.h_i_gid_high
474#define i_author osd2.hurd2.h_i_author
475
476#elif defined(__masix__)
477
478#define i_reserved1 osd1.masix1.m_i_reserved1
479#define i_file_acl_high osd2.masix2.m_i_file_acl_high
480#define i_reserved2 osd2.masix2.m_i_reserved2
481
482#endif /* defined(__KERNEL__) || defined(__linux__) */
483
484/*
485 * File system states
486 */
487#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
488#define EXT4_ERROR_FS 0x0002 /* Errors detected */
489#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
490
491/*
492 * Misc. filesystem flags
493 */
494#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
495#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
496#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
497
498/*
499 * Mount flags
500 */
501#define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
502#define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
503#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
504#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
505#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
506#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
507#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
508#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
509#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
510#define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
511#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
512#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
513#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
514#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
515#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
516#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
517#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
518#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
519#define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
520#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
521#define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
522#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
523#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
524#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
525#define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
526#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
527#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
528#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
529#define EXT4_MOUNT_MBALLOC 0x4000000 /* Buddy allocation support */
530/* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
531#ifndef _LINUX_EXT2_FS_H
532#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
533#define set_opt(o, opt) o |= EXT4_MOUNT_##opt
534#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
535 EXT4_MOUNT_##opt)
536#else
537#define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
538#define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
539#define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
540#endif
541
542#define ext4_set_bit ext2_set_bit
543#define ext4_set_bit_atomic ext2_set_bit_atomic
544#define ext4_clear_bit ext2_clear_bit
545#define ext4_clear_bit_atomic ext2_clear_bit_atomic
546#define ext4_test_bit ext2_test_bit
547#define ext4_find_first_zero_bit ext2_find_first_zero_bit
548#define ext4_find_next_zero_bit ext2_find_next_zero_bit
549#define ext4_find_next_bit ext2_find_next_bit
550
551/*
552 * Maximal mount counts between two filesystem checks
553 */
554#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
555#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
556
557/*
558 * Behaviour when detecting errors
559 */
560#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
561#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
562#define EXT4_ERRORS_PANIC 3 /* Panic */
563#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
564
565/*
566 * Structure of the super block
567 */
568struct ext4_super_block {
569/*00*/ __le32 s_inodes_count; /* Inodes count */
570 __le32 s_blocks_count_lo; /* Blocks count */
571 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
572 __le32 s_free_blocks_count_lo; /* Free blocks count */
573/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
574 __le32 s_first_data_block; /* First Data Block */
575 __le32 s_log_block_size; /* Block size */
576 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
577/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
578 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
579 __le32 s_inodes_per_group; /* # Inodes per group */
580 __le32 s_mtime; /* Mount time */
581/*30*/ __le32 s_wtime; /* Write time */
582 __le16 s_mnt_count; /* Mount count */
583 __le16 s_max_mnt_count; /* Maximal mount count */
584 __le16 s_magic; /* Magic signature */
585 __le16 s_state; /* File system state */
586 __le16 s_errors; /* Behaviour when detecting errors */
587 __le16 s_minor_rev_level; /* minor revision level */
588/*40*/ __le32 s_lastcheck; /* time of last check */
589 __le32 s_checkinterval; /* max. time between checks */
590 __le32 s_creator_os; /* OS */
591 __le32 s_rev_level; /* Revision level */
592/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
593 __le16 s_def_resgid; /* Default gid for reserved blocks */
594 /*
595 * These fields are for EXT4_DYNAMIC_REV superblocks only.
596 *
597 * Note: the difference between the compatible feature set and
598 * the incompatible feature set is that if there is a bit set
599 * in the incompatible feature set that the kernel doesn't
600 * know about, it should refuse to mount the filesystem.
601 *
602 * e2fsck's requirements are more strict; if it doesn't know
603 * about a feature in either the compatible or incompatible
604 * feature set, it must abort and not try to meddle with
605 * things it doesn't understand...
606 */
607 __le32 s_first_ino; /* First non-reserved inode */
608 __le16 s_inode_size; /* size of inode structure */
609 __le16 s_block_group_nr; /* block group # of this superblock */
610 __le32 s_feature_compat; /* compatible feature set */
611/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
612 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
613/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
614/*78*/ char s_volume_name[16]; /* volume name */
615/*88*/ char s_last_mounted[64]; /* directory where last mounted */
616/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
617 /*
618 * Performance hints. Directory preallocation should only
619 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
620 */
621 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
622 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
623 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
624 /*
625 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
626 */
627/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
628/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
629 __le32 s_journal_dev; /* device number of journal file */
630 __le32 s_last_orphan; /* start of list of inodes to delete */
631 __le32 s_hash_seed[4]; /* HTREE hash seed */
632 __u8 s_def_hash_version; /* Default hash version to use */
633 __u8 s_reserved_char_pad;
634 __le16 s_desc_size; /* size of group descriptor */
635/*100*/ __le32 s_default_mount_opts;
636 __le32 s_first_meta_bg; /* First metablock block group */
637 __le32 s_mkfs_time; /* When the filesystem was created */
638 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
639 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
640/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
641 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
642 __le32 s_free_blocks_count_hi; /* Free blocks count */
643 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
644 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
645 __le32 s_flags; /* Miscellaneous flags */
646 __le16 s_raid_stride; /* RAID stride */
647 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
648 __le64 s_mmp_block; /* Block for multi-mount protection */
649 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
650 __u32 s_reserved[163]; /* Padding to the end of the block */
651};
652
653#ifdef __KERNEL__
654static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
655{
656 return sb->s_fs_info;
657}
658static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
659{
660 return container_of(inode, struct ext4_inode_info, vfs_inode);
661}
662
663static inline struct timespec ext4_current_time(struct inode *inode)
664{
665 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
666 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
667}
668
669
670static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
671{
672 return ino == EXT4_ROOT_INO ||
673 ino == EXT4_JOURNAL_INO ||
674 ino == EXT4_RESIZE_INO ||
675 (ino >= EXT4_FIRST_INO(sb) &&
676 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
677}
678#else
679/* Assume that user mode programs are passing in an ext4fs superblock, not
680 * a kernel struct super_block. This will allow us to call the feature-test
681 * macros from user land. */
682#define EXT4_SB(sb) (sb)
683#endif
684
685#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
686
687/*
688 * Codes for operating systems
689 */
690#define EXT4_OS_LINUX 0
691#define EXT4_OS_HURD 1
692#define EXT4_OS_MASIX 2
693#define EXT4_OS_FREEBSD 3
694#define EXT4_OS_LITES 4
695
696/*
697 * Revision levels
698 */
699#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
700#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
701
702#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
703#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
704
705#define EXT4_GOOD_OLD_INODE_SIZE 128
706
707/*
708 * Feature set definitions
709 */
710
711#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
712 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
713#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
714 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
715#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
716 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
717#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
718 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
719#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
720 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
721#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
722 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
723#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
724 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
725#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
726 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
727#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
728 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
729
730#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
731#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
732#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
733#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
734#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
735#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
736
737#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
738#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
739#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
740#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
741#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
742#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
743#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
744
745#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
746#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
747#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
748#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
749#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
750#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
751#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
752#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
753#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
754
755#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
756#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
757 EXT4_FEATURE_INCOMPAT_RECOVER| \
758 EXT4_FEATURE_INCOMPAT_META_BG| \
759 EXT4_FEATURE_INCOMPAT_EXTENTS| \
760 EXT4_FEATURE_INCOMPAT_64BIT| \
761 EXT4_FEATURE_INCOMPAT_FLEX_BG)
762#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
763 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
764 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
765 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
766 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
767 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
768 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
769
770/*
771 * Default values for user and/or group using reserved blocks
772 */
773#define EXT4_DEF_RESUID 0
774#define EXT4_DEF_RESGID 0
775
776/*
777 * Default mount options
778 */
779#define EXT4_DEFM_DEBUG 0x0001
780#define EXT4_DEFM_BSDGROUPS 0x0002
781#define EXT4_DEFM_XATTR_USER 0x0004
782#define EXT4_DEFM_ACL 0x0008
783#define EXT4_DEFM_UID16 0x0010
784#define EXT4_DEFM_JMODE 0x0060
785#define EXT4_DEFM_JMODE_DATA 0x0020
786#define EXT4_DEFM_JMODE_ORDERED 0x0040
787#define EXT4_DEFM_JMODE_WBACK 0x0060
788
789/*
790 * Structure of a directory entry
791 */
792#define EXT4_NAME_LEN 255
793
794struct ext4_dir_entry {
795 __le32 inode; /* Inode number */
796 __le16 rec_len; /* Directory entry length */
797 __le16 name_len; /* Name length */
798 char name[EXT4_NAME_LEN]; /* File name */
799};
800
801/*
802 * The new version of the directory entry. Since EXT4 structures are
803 * stored in intel byte order, and the name_len field could never be
804 * bigger than 255 chars, it's safe to reclaim the extra byte for the
805 * file_type field.
806 */
807struct ext4_dir_entry_2 {
808 __le32 inode; /* Inode number */
809 __le16 rec_len; /* Directory entry length */
810 __u8 name_len; /* Name length */
811 __u8 file_type;
812 char name[EXT4_NAME_LEN]; /* File name */
813};
814
815/*
816 * Ext4 directory file types. Only the low 3 bits are used. The
817 * other bits are reserved for now.
818 */
819#define EXT4_FT_UNKNOWN 0
820#define EXT4_FT_REG_FILE 1
821#define EXT4_FT_DIR 2
822#define EXT4_FT_CHRDEV 3
823#define EXT4_FT_BLKDEV 4
824#define EXT4_FT_FIFO 5
825#define EXT4_FT_SOCK 6
826#define EXT4_FT_SYMLINK 7
827
828#define EXT4_FT_MAX 8
829
830/*
831 * EXT4_DIR_PAD defines the directory entries boundaries
832 *
833 * NOTE: It must be a multiple of 4
834 */
835#define EXT4_DIR_PAD 4
836#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
837#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
838 ~EXT4_DIR_ROUND)
839#define EXT4_MAX_REC_LEN ((1<<16)-1)
840
841static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
842{
843 unsigned len = le16_to_cpu(dlen);
844
845 if (len == EXT4_MAX_REC_LEN)
846 return 1 << 16;
847 return len;
848}
849
850static inline __le16 ext4_rec_len_to_disk(unsigned len)
851{
852 if (len == (1 << 16))
853 return cpu_to_le16(EXT4_MAX_REC_LEN);
854 else if (len > (1 << 16))
855 BUG();
856 return cpu_to_le16(len);
857}
858
859/*
860 * Hash Tree Directory indexing
861 * (c) Daniel Phillips, 2001
862 */
863
864#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
865 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
866 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
867#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
868#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
869
870/* Legal values for the dx_root hash_version field: */
871
872#define DX_HASH_LEGACY 0
873#define DX_HASH_HALF_MD4 1
874#define DX_HASH_TEA 2
875
876#ifdef __KERNEL__
877
878/* hash info structure used by the directory hash */
879struct dx_hash_info
880{
881 u32 hash;
882 u32 minor_hash;
883 int hash_version;
884 u32 *seed;
885};
886
887#define EXT4_HTREE_EOF 0x7fffffff
888
889/*
890 * Control parameters used by ext4_htree_next_block
891 */
892#define HASH_NB_ALWAYS 1
893
894
895/*
896 * Describe an inode's exact location on disk and in memory
897 */
898struct ext4_iloc
899{
900 struct buffer_head *bh;
901 unsigned long offset;
902 ext4_group_t block_group;
903};
904
905static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
906{
907 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
908}
909
910/*
911 * This structure is stuffed into the struct file's private_data field
912 * for directories. It is where we put information so that we can do
913 * readdir operations in hash tree order.
914 */
915struct dir_private_info {
916 struct rb_root root;
917 struct rb_node *curr_node;
918 struct fname *extra_fname;
919 loff_t last_pos;
920 __u32 curr_hash;
921 __u32 curr_minor_hash;
922 __u32 next_hash;
923};
924
925/* calculate the first block number of the group */
926static inline ext4_fsblk_t
927ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
928{
929 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
930 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
931}
932
933/*
934 * Special error return code only used by dx_probe() and its callers.
935 */
936#define ERR_BAD_DX_DIR -75000
937
938void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
939 unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
940
941/*
942 * Function prototypes
943 */
944
945/*
946 * Ok, these declarations are also in <linux/kernel.h> but none of the
947 * ext4 source programs needs to include it so they are duplicated here.
948 */
949# define NORET_TYPE /**/
950# define ATTRIB_NORET __attribute__((noreturn))
951# define NORET_AND noreturn,
952
953/* balloc.c */
954extern unsigned int ext4_block_group(struct super_block *sb,
955 ext4_fsblk_t blocknr);
956extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
957 ext4_fsblk_t blocknr);
958extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
959extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
960 ext4_group_t group);
961extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
962 ext4_fsblk_t goal, int *errp);
963extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
964 ext4_fsblk_t goal, unsigned long *count, int *errp);
965extern ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
966 ext4_fsblk_t goal, unsigned long *count, int *errp);
967extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
968 ext4_fsblk_t block, unsigned long count, int metadata);
969extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
970 ext4_fsblk_t block, unsigned long count,
971 unsigned long *pdquot_freed_blocks);
972extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
973extern void ext4_check_blocks_bitmap (struct super_block *);
974extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
975 ext4_group_t block_group,
976 struct buffer_head ** bh);
977extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
978extern void ext4_init_block_alloc_info(struct inode *);
979extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
980
981/* dir.c */
982extern int ext4_check_dir_entry(const char *, struct inode *,
983 struct ext4_dir_entry_2 *,
984 struct buffer_head *, unsigned long);
985extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
986 __u32 minor_hash,
987 struct ext4_dir_entry_2 *dirent);
988extern void ext4_htree_free_dir_info(struct dir_private_info *p);
989
990/* fsync.c */
991extern int ext4_sync_file (struct file *, struct dentry *, int);
992
993/* hash.c */
994extern int ext4fs_dirhash(const char *name, int len, struct
995 dx_hash_info *hinfo);
996
997/* ialloc.c */
998extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
999extern void ext4_free_inode (handle_t *, struct inode *);
1000extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
1001extern unsigned long ext4_count_free_inodes (struct super_block *);
1002extern unsigned long ext4_count_dirs (struct super_block *);
1003extern void ext4_check_inodes_bitmap (struct super_block *);
1004extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
1005
1006/* mballoc.c */
1007extern long ext4_mb_stats;
1008extern long ext4_mb_max_to_scan;
1009extern int ext4_mb_init(struct super_block *, int);
1010extern int ext4_mb_release(struct super_block *);
1011extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1012 struct ext4_allocation_request *, int *);
1013extern int ext4_mb_reserve_blocks(struct super_block *, int);
1014extern void ext4_mb_discard_inode_preallocations(struct inode *);
1015extern int __init init_ext4_mballoc(void);
1016extern void exit_ext4_mballoc(void);
1017extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1018 unsigned long, unsigned long, int, unsigned long *);
1019
1020
1021/* inode.c */
1022int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1023 struct buffer_head *bh, ext4_fsblk_t blocknr);
1024struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1025 ext4_lblk_t, int, int *);
1026struct buffer_head *ext4_bread(handle_t *, struct inode *,
1027 ext4_lblk_t, int, int *);
1028int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
1029 ext4_lblk_t iblock, unsigned long maxblocks,
1030 struct buffer_head *bh_result,
1031 int create, int extend_disksize);
1032
1033extern struct inode *ext4_iget(struct super_block *, unsigned long);
1034extern int ext4_write_inode (struct inode *, int);
1035extern int ext4_setattr (struct dentry *, struct iattr *);
1036extern void ext4_delete_inode (struct inode *);
1037extern int ext4_sync_inode (handle_t *, struct inode *);
1038extern void ext4_discard_reservation (struct inode *);
1039extern void ext4_dirty_inode(struct inode *);
1040extern int ext4_change_inode_journal_flag(struct inode *, int);
1041extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1042extern void ext4_truncate (struct inode *);
1043extern void ext4_set_inode_flags(struct inode *);
1044extern void ext4_get_inode_flags(struct ext4_inode_info *);
1045extern void ext4_set_aops(struct inode *inode);
1046extern int ext4_writepage_trans_blocks(struct inode *);
1047extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
1048 struct address_space *mapping, loff_t from);
1049
1050/* ioctl.c */
1051extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1052extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
1053
1054/* migrate.c */
1055extern int ext4_ext_migrate(struct inode *, struct file *, unsigned int,
1056 unsigned long);
1057/* namei.c */
1058extern int ext4_orphan_add(handle_t *, struct inode *);
1059extern int ext4_orphan_del(handle_t *, struct inode *);
1060extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1061 __u32 start_minor_hash, __u32 *next_hash);
1062
1063/* resize.c */
1064extern int ext4_group_add(struct super_block *sb,
1065 struct ext4_new_group_data *input);
1066extern int ext4_group_extend(struct super_block *sb,
1067 struct ext4_super_block *es,
1068 ext4_fsblk_t n_blocks_count);
1069
1070/* super.c */
1071extern void ext4_error (struct super_block *, const char *, const char *, ...)
1072 __attribute__ ((format (printf, 3, 4)));
1073extern void __ext4_std_error (struct super_block *, const char *, int);
1074extern void ext4_abort (struct super_block *, const char *, const char *, ...)
1075 __attribute__ ((format (printf, 3, 4)));
1076extern void ext4_warning (struct super_block *, const char *, const char *, ...)
1077 __attribute__ ((format (printf, 3, 4)));
1078extern void ext4_update_dynamic_rev (struct super_block *sb);
1079extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1080 __u32 compat);
1081extern int ext4_update_rocompat_feature(handle_t *handle,
1082 struct super_block *sb, __u32 rocompat);
1083extern int ext4_update_incompat_feature(handle_t *handle,
1084 struct super_block *sb, __u32 incompat);
1085extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1086 struct ext4_group_desc *bg);
1087extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1088 struct ext4_group_desc *bg);
1089extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1090 struct ext4_group_desc *bg);
1091extern void ext4_block_bitmap_set(struct super_block *sb,
1092 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1093extern void ext4_inode_bitmap_set(struct super_block *sb,
1094 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1095extern void ext4_inode_table_set(struct super_block *sb,
1096 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1097
1098static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1099{
1100 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1101 le32_to_cpu(es->s_blocks_count_lo);
1102}
1103
1104static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1105{
1106 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1107 le32_to_cpu(es->s_r_blocks_count_lo);
1108}
1109
1110static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1111{
1112 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1113 le32_to_cpu(es->s_free_blocks_count_lo);
1114}
1115
1116static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1117 ext4_fsblk_t blk)
1118{
1119 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1120 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1121}
1122
1123static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1124 ext4_fsblk_t blk)
1125{
1126 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1127 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1128}
1129
1130static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1131 ext4_fsblk_t blk)
1132{
1133 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1134 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1135}
1136
1137static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1138{
1139 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1140 le32_to_cpu(raw_inode->i_size_lo);
1141}
1142
1143static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1144{
1145 raw_inode->i_size_lo = cpu_to_le32(i_size);
1146 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1147}
1148
1149static inline
1150struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1151 ext4_group_t group)
1152{
1153 struct ext4_group_info ***grp_info;
1154 long indexv, indexh;
1155 grp_info = EXT4_SB(sb)->s_group_info;
1156 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1157 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1158 return grp_info[indexv][indexh];
1159}
1160
1161
1162#define ext4_std_error(sb, errno) \
1163do { \
1164 if ((errno)) \
1165 __ext4_std_error((sb), __FUNCTION__, (errno)); \
1166} while (0)
1167
1168/*
1169 * Inodes and files operations
1170 */
1171
1172/* dir.c */
1173extern const struct file_operations ext4_dir_operations;
1174
1175/* file.c */
1176extern const struct inode_operations ext4_file_inode_operations;
1177extern const struct file_operations ext4_file_operations;
1178
1179/* namei.c */
1180extern const struct inode_operations ext4_dir_inode_operations;
1181extern const struct inode_operations ext4_special_inode_operations;
1182
1183/* symlink.c */
1184extern const struct inode_operations ext4_symlink_inode_operations;
1185extern const struct inode_operations ext4_fast_symlink_inode_operations;
1186
1187/* extents.c */
1188extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1189extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1190extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1191 ext4_lblk_t iblock,
1192 unsigned long max_blocks, struct buffer_head *bh_result,
1193 int create, int extend_disksize);
1194extern void ext4_ext_truncate(struct inode *, struct page *);
1195extern void ext4_ext_init(struct super_block *);
1196extern void ext4_ext_release(struct super_block *);
1197extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1198 loff_t len);
1199extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1200 sector_t block, unsigned long max_blocks,
1201 struct buffer_head *bh, int create,
1202 int extend_disksize);
1203#endif /* __KERNEL__ */
1204
1205#endif /* _LINUX_EXT4_FS_H */
diff --git a/include/linux/ext4_fs_extents.h b/include/linux/ext4_fs_extents.h
deleted file mode 100644
index 1285c583b2d8..000000000000
--- a/include/linux/ext4_fs_extents.h
+++ /dev/null
@@ -1,232 +0,0 @@
1/*
2 * Copyright (c) 2003-2006, Cluster File Systems, Inc, info@clusterfs.com
3 * Written by Alex Tomas <alex@clusterfs.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public Licens
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-
17 */
18
19#ifndef _LINUX_EXT4_EXTENTS
20#define _LINUX_EXT4_EXTENTS
21
22#include <linux/ext4_fs.h>
23
24/*
25 * With AGGRESSIVE_TEST defined, the capacity of index/leaf blocks
26 * becomes very small, so index split, in-depth growing and
27 * other hard changes happen much more often.
28 * This is for debug purposes only.
29 */
30#define AGGRESSIVE_TEST_
31
32/*
33 * With EXTENTS_STATS defined, the number of blocks and extents
34 * are collected in the truncate path. They'll be shown at
35 * umount time.
36 */
37#define EXTENTS_STATS__
38
39/*
40 * If CHECK_BINSEARCH is defined, then the results of the binary search
41 * will also be checked by linear search.
42 */
43#define CHECK_BINSEARCH__
44
45/*
46 * If EXT_DEBUG is defined you can use the 'extdebug' mount option
47 * to get lots of info about what's going on.
48 */
49#define EXT_DEBUG__
50#ifdef EXT_DEBUG
51#define ext_debug(a...) printk(a)
52#else
53#define ext_debug(a...)
54#endif
55
56/*
57 * If EXT_STATS is defined then stats numbers are collected.
58 * These number will be displayed at umount time.
59 */
60#define EXT_STATS_
61
62
63/*
64 * ext4_inode has i_block array (60 bytes total).
65 * The first 12 bytes store ext4_extent_header;
66 * the remainder stores an array of ext4_extent.
67 */
68
69/*
70 * This is the extent on-disk structure.
71 * It's used at the bottom of the tree.
72 */
73struct ext4_extent {
74 __le32 ee_block; /* first logical block extent covers */
75 __le16 ee_len; /* number of blocks covered by extent */
76 __le16 ee_start_hi; /* high 16 bits of physical block */
77 __le32 ee_start_lo; /* low 32 bits of physical block */
78};
79
80/*
81 * This is index on-disk structure.
82 * It's used at all the levels except the bottom.
83 */
84struct ext4_extent_idx {
85 __le32 ei_block; /* index covers logical blocks from 'block' */
86 __le32 ei_leaf_lo; /* pointer to the physical block of the next *
87 * level. leaf or next index could be there */
88 __le16 ei_leaf_hi; /* high 16 bits of physical block */
89 __u16 ei_unused;
90};
91
92/*
93 * Each block (leaves and indexes), even inode-stored has header.
94 */
95struct ext4_extent_header {
96 __le16 eh_magic; /* probably will support different formats */
97 __le16 eh_entries; /* number of valid entries */
98 __le16 eh_max; /* capacity of store in entries */
99 __le16 eh_depth; /* has tree real underlying blocks? */
100 __le32 eh_generation; /* generation of the tree */
101};
102
103#define EXT4_EXT_MAGIC cpu_to_le16(0xf30a)
104
105/*
106 * Array of ext4_ext_path contains path to some extent.
107 * Creation/lookup routines use it for traversal/splitting/etc.
108 * Truncate uses it to simulate recursive walking.
109 */
110struct ext4_ext_path {
111 ext4_fsblk_t p_block;
112 __u16 p_depth;
113 struct ext4_extent *p_ext;
114 struct ext4_extent_idx *p_idx;
115 struct ext4_extent_header *p_hdr;
116 struct buffer_head *p_bh;
117};
118
119/*
120 * structure for external API
121 */
122
123#define EXT4_EXT_CACHE_NO 0
124#define EXT4_EXT_CACHE_GAP 1
125#define EXT4_EXT_CACHE_EXTENT 2
126
127
128#define EXT_MAX_BLOCK 0xffffffff
129
130/*
131 * EXT_INIT_MAX_LEN is the maximum number of blocks we can have in an
132 * initialized extent. This is 2^15 and not (2^16 - 1), since we use the
133 * MSB of ee_len field in the extent datastructure to signify if this
134 * particular extent is an initialized extent or an uninitialized (i.e.
135 * preallocated).
136 * EXT_UNINIT_MAX_LEN is the maximum number of blocks we can have in an
137 * uninitialized extent.
138 * If ee_len is <= 0x8000, it is an initialized extent. Otherwise, it is an
139 * uninitialized one. In other words, if MSB of ee_len is set, it is an
140 * uninitialized extent with only one special scenario when ee_len = 0x8000.
141 * In this case we can not have an uninitialized extent of zero length and
142 * thus we make it as a special case of initialized extent with 0x8000 length.
143 * This way we get better extent-to-group alignment for initialized extents.
144 * Hence, the maximum number of blocks we can have in an *initialized*
145 * extent is 2^15 (32768) and in an *uninitialized* extent is 2^15-1 (32767).
146 */
147#define EXT_INIT_MAX_LEN (1UL << 15)
148#define EXT_UNINIT_MAX_LEN (EXT_INIT_MAX_LEN - 1)
149
150
151#define EXT_FIRST_EXTENT(__hdr__) \
152 ((struct ext4_extent *) (((char *) (__hdr__)) + \
153 sizeof(struct ext4_extent_header)))
154#define EXT_FIRST_INDEX(__hdr__) \
155 ((struct ext4_extent_idx *) (((char *) (__hdr__)) + \
156 sizeof(struct ext4_extent_header)))
157#define EXT_HAS_FREE_INDEX(__path__) \
158 (le16_to_cpu((__path__)->p_hdr->eh_entries) \
159 < le16_to_cpu((__path__)->p_hdr->eh_max))
160#define EXT_LAST_EXTENT(__hdr__) \
161 (EXT_FIRST_EXTENT((__hdr__)) + le16_to_cpu((__hdr__)->eh_entries) - 1)
162#define EXT_LAST_INDEX(__hdr__) \
163 (EXT_FIRST_INDEX((__hdr__)) + le16_to_cpu((__hdr__)->eh_entries) - 1)
164#define EXT_MAX_EXTENT(__hdr__) \
165 (EXT_FIRST_EXTENT((__hdr__)) + le16_to_cpu((__hdr__)->eh_max) - 1)
166#define EXT_MAX_INDEX(__hdr__) \
167 (EXT_FIRST_INDEX((__hdr__)) + le16_to_cpu((__hdr__)->eh_max) - 1)
168
169static inline struct ext4_extent_header *ext_inode_hdr(struct inode *inode)
170{
171 return (struct ext4_extent_header *) EXT4_I(inode)->i_data;
172}
173
174static inline struct ext4_extent_header *ext_block_hdr(struct buffer_head *bh)
175{
176 return (struct ext4_extent_header *) bh->b_data;
177}
178
179static inline unsigned short ext_depth(struct inode *inode)
180{
181 return le16_to_cpu(ext_inode_hdr(inode)->eh_depth);
182}
183
184static inline void ext4_ext_tree_changed(struct inode *inode)
185{
186 EXT4_I(inode)->i_ext_generation++;
187}
188
189static inline void
190ext4_ext_invalidate_cache(struct inode *inode)
191{
192 EXT4_I(inode)->i_cached_extent.ec_type = EXT4_EXT_CACHE_NO;
193}
194
195static inline void ext4_ext_mark_uninitialized(struct ext4_extent *ext)
196{
197 /* We can not have an uninitialized extent of zero length! */
198 BUG_ON((le16_to_cpu(ext->ee_len) & ~EXT_INIT_MAX_LEN) == 0);
199 ext->ee_len |= cpu_to_le16(EXT_INIT_MAX_LEN);
200}
201
202static inline int ext4_ext_is_uninitialized(struct ext4_extent *ext)
203{
204 /* Extent with ee_len of 0x8000 is treated as an initialized extent */
205 return (le16_to_cpu(ext->ee_len) > EXT_INIT_MAX_LEN);
206}
207
208static inline int ext4_ext_get_actual_len(struct ext4_extent *ext)
209{
210 return (le16_to_cpu(ext->ee_len) <= EXT_INIT_MAX_LEN ?
211 le16_to_cpu(ext->ee_len) :
212 (le16_to_cpu(ext->ee_len) - EXT_INIT_MAX_LEN));
213}
214
215extern ext4_fsblk_t idx_pblock(struct ext4_extent_idx *);
216extern void ext4_ext_store_pblock(struct ext4_extent *, ext4_fsblk_t);
217extern int ext4_extent_tree_init(handle_t *, struct inode *);
218extern int ext4_ext_calc_credits_for_insert(struct inode *, struct ext4_ext_path *);
219extern int ext4_ext_try_to_merge(struct inode *inode,
220 struct ext4_ext_path *path,
221 struct ext4_extent *);
222extern unsigned int ext4_ext_check_overlap(struct inode *, struct ext4_extent *, struct ext4_ext_path *);
223extern int ext4_ext_insert_extent(handle_t *, struct inode *, struct ext4_ext_path *, struct ext4_extent *);
224extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t,
225 struct ext4_ext_path *);
226extern int ext4_ext_search_left(struct inode *, struct ext4_ext_path *,
227 ext4_lblk_t *, ext4_fsblk_t *);
228extern int ext4_ext_search_right(struct inode *, struct ext4_ext_path *,
229 ext4_lblk_t *, ext4_fsblk_t *);
230extern void ext4_ext_drop_refs(struct ext4_ext_path *);
231#endif /* _LINUX_EXT4_EXTENTS */
232
diff --git a/include/linux/ext4_fs_i.h b/include/linux/ext4_fs_i.h
deleted file mode 100644
index d5508d3cf290..000000000000
--- a/include/linux/ext4_fs_i.h
+++ /dev/null
@@ -1,167 +0,0 @@
1/*
2 * linux/include/linux/ext4_fs_i.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_i.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
16#ifndef _LINUX_EXT4_FS_I
17#define _LINUX_EXT4_FS_I
18
19#include <linux/rwsem.h>
20#include <linux/rbtree.h>
21#include <linux/seqlock.h>
22#include <linux/mutex.h>
23
24/* data type for block offset of block group */
25typedef int ext4_grpblk_t;
26
27/* data type for filesystem-wide blocks number */
28typedef unsigned long long ext4_fsblk_t;
29
30/* data type for file logical block number */
31typedef __u32 ext4_lblk_t;
32
33/* data type for block group number */
34typedef unsigned long ext4_group_t;
35
36struct ext4_reserve_window {
37 ext4_fsblk_t _rsv_start; /* First byte reserved */
38 ext4_fsblk_t _rsv_end; /* Last byte reserved or 0 */
39};
40
41struct ext4_reserve_window_node {
42 struct rb_node rsv_node;
43 __u32 rsv_goal_size;
44 __u32 rsv_alloc_hit;
45 struct ext4_reserve_window rsv_window;
46};
47
48struct ext4_block_alloc_info {
49 /* information about reservation window */
50 struct ext4_reserve_window_node rsv_window_node;
51 /*
52 * was i_next_alloc_block in ext4_inode_info
53 * is the logical (file-relative) number of the
54 * most-recently-allocated block in this file.
55 * We use this for detecting linearly ascending allocation requests.
56 */
57 ext4_lblk_t last_alloc_logical_block;
58 /*
59 * Was i_next_alloc_goal in ext4_inode_info
60 * is the *physical* companion to i_next_alloc_block.
61 * it the physical block number of the block which was most-recentl
62 * allocated to this file. This give us the goal (target) for the next
63 * allocation when we detect linearly ascending requests.
64 */
65 ext4_fsblk_t last_alloc_physical_block;
66};
67
68#define rsv_start rsv_window._rsv_start
69#define rsv_end rsv_window._rsv_end
70
71/*
72 * storage for cached extent
73 */
74struct ext4_ext_cache {
75 ext4_fsblk_t ec_start;
76 ext4_lblk_t ec_block;
77 __u32 ec_len; /* must be 32bit to return holes */
78 __u32 ec_type;
79};
80
81/*
82 * third extended file system inode data in memory
83 */
84struct ext4_inode_info {
85 __le32 i_data[15]; /* unconverted */
86 __u32 i_flags;
87 ext4_fsblk_t i_file_acl;
88 __u32 i_dtime;
89
90 /*
91 * i_block_group is the number of the block group which contains
92 * this file's inode. Constant across the lifetime of the inode,
93 * it is ued for making block allocation decisions - we try to
94 * place a file's data blocks near its inode block, and new inodes
95 * near to their parent directory's inode.
96 */
97 ext4_group_t i_block_group;
98 __u32 i_state; /* Dynamic state flags for ext4 */
99
100 /* block reservation info */
101 struct ext4_block_alloc_info *i_block_alloc_info;
102
103 ext4_lblk_t i_dir_start_lookup;
104#ifdef CONFIG_EXT4DEV_FS_XATTR
105 /*
106 * Extended attributes can be read independently of the main file
107 * data. Taking i_mutex even when reading would cause contention
108 * between readers of EAs and writers of regular file data, so
109 * instead we synchronize on xattr_sem when reading or changing
110 * EAs.
111 */
112 struct rw_semaphore xattr_sem;
113#endif
114#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
115 struct posix_acl *i_acl;
116 struct posix_acl *i_default_acl;
117#endif
118
119 struct list_head i_orphan; /* unlinked but open inodes */
120
121 /*
122 * i_disksize keeps track of what the inode size is ON DISK, not
123 * in memory. During truncate, i_size is set to the new size by
124 * the VFS prior to calling ext4_truncate(), but the filesystem won't
125 * set i_disksize to 0 until the truncate is actually under way.
126 *
127 * The intent is that i_disksize always represents the blocks which
128 * are used by this file. This allows recovery to restart truncate
129 * on orphans if we crash during truncate. We actually write i_disksize
130 * into the on-disk inode when writing inodes out, instead of i_size.
131 *
132 * The only time when i_disksize and i_size may be different is when
133 * a truncate is in progress. The only things which change i_disksize
134 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
135 */
136 loff_t i_disksize;
137
138 /* on-disk additional length */
139 __u16 i_extra_isize;
140
141 /*
142 * i_data_sem is for serialising ext4_truncate() against
143 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
144 * data tree are chopped off during truncate. We can't do that in
145 * ext4 because whenever we perform intermediate commits during
146 * truncate, the inode and all the metadata blocks *must* be in a
147 * consistent state which allows truncation of the orphans to restart
148 * during recovery. Hence we must fix the get_block-vs-truncate race
149 * by other means, so we have i_data_sem.
150 */
151 struct rw_semaphore i_data_sem;
152 struct inode vfs_inode;
153
154 unsigned long i_ext_generation;
155 struct ext4_ext_cache i_cached_extent;
156 /*
157 * File creation time. Its function is same as that of
158 * struct timespec i_{a,c,m}time in the generic inode.
159 */
160 struct timespec i_crtime;
161
162 /* mballoc */
163 struct list_head i_prealloc_list;
164 spinlock_t i_prealloc_lock;
165};
166
167#endif /* _LINUX_EXT4_FS_I */
diff --git a/include/linux/ext4_fs_sb.h b/include/linux/ext4_fs_sb.h
deleted file mode 100644
index abaae2c8cccf..000000000000
--- a/include/linux/ext4_fs_sb.h
+++ /dev/null
@@ -1,148 +0,0 @@
1/*
2 * linux/include/linux/ext4_fs_sb.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_sb.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
16#ifndef _LINUX_EXT4_FS_SB
17#define _LINUX_EXT4_FS_SB
18
19#ifdef __KERNEL__
20#include <linux/timer.h>
21#include <linux/wait.h>
22#include <linux/blockgroup_lock.h>
23#include <linux/percpu_counter.h>
24#endif
25#include <linux/rbtree.h>
26
27/*
28 * third extended-fs super-block data in memory
29 */
30struct ext4_sb_info {
31 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
32 unsigned long s_inodes_per_block;/* Number of inodes per block */
33 unsigned long s_blocks_per_group;/* Number of blocks in a group */
34 unsigned long s_inodes_per_group;/* Number of inodes in a group */
35 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
36 unsigned long s_gdb_count; /* Number of group descriptor blocks */
37 unsigned long s_desc_per_block; /* Number of group descriptors per block */
38 ext4_group_t s_groups_count; /* Number of groups in the fs */
39 unsigned long s_overhead_last; /* Last calculated overhead */
40 unsigned long s_blocks_last; /* Last seen block count */
41 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
42 struct buffer_head * s_sbh; /* Buffer containing the super block */
43 struct ext4_super_block * s_es; /* Pointer to the super block in the buffer */
44 struct buffer_head ** s_group_desc;
45 unsigned long s_mount_opt;
46 ext4_fsblk_t s_sb_block;
47 uid_t s_resuid;
48 gid_t s_resgid;
49 unsigned short s_mount_state;
50 unsigned short s_pad;
51 int s_addr_per_block_bits;
52 int s_desc_per_block_bits;
53 int s_inode_size;
54 int s_first_ino;
55 spinlock_t s_next_gen_lock;
56 u32 s_next_generation;
57 u32 s_hash_seed[4];
58 int s_def_hash_version;
59 struct percpu_counter s_freeblocks_counter;
60 struct percpu_counter s_freeinodes_counter;
61 struct percpu_counter s_dirs_counter;
62 struct blockgroup_lock s_blockgroup_lock;
63
64 /* root of the per fs reservation window tree */
65 spinlock_t s_rsv_window_lock;
66 struct rb_root s_rsv_window_root;
67 struct ext4_reserve_window_node s_rsv_window_head;
68
69 /* Journaling */
70 struct inode * s_journal_inode;
71 struct journal_s * s_journal;
72 struct list_head s_orphan;
73 unsigned long s_commit_interval;
74 struct block_device *journal_bdev;
75#ifdef CONFIG_JBD2_DEBUG
76 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
77 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
78#endif
79#ifdef CONFIG_QUOTA
80 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
81 int s_jquota_fmt; /* Format of quota to use */
82#endif
83 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
84
85#ifdef EXTENTS_STATS
86 /* ext4 extents stats */
87 unsigned long s_ext_min;
88 unsigned long s_ext_max;
89 unsigned long s_depth_max;
90 spinlock_t s_ext_stats_lock;
91 unsigned long s_ext_blocks;
92 unsigned long s_ext_extents;
93#endif
94
95 /* for buddy allocator */
96 struct ext4_group_info ***s_group_info;
97 struct inode *s_buddy_cache;
98 long s_blocks_reserved;
99 spinlock_t s_reserve_lock;
100 struct list_head s_active_transaction;
101 struct list_head s_closed_transaction;
102 struct list_head s_committed_transaction;
103 spinlock_t s_md_lock;
104 tid_t s_last_transaction;
105 unsigned short *s_mb_offsets, *s_mb_maxs;
106
107 /* tunables */
108 unsigned long s_stripe;
109 unsigned long s_mb_stream_request;
110 unsigned long s_mb_max_to_scan;
111 unsigned long s_mb_min_to_scan;
112 unsigned long s_mb_stats;
113 unsigned long s_mb_order2_reqs;
114 unsigned long s_mb_group_prealloc;
115 /* where last allocation was done - for stream allocation */
116 unsigned long s_mb_last_group;
117 unsigned long s_mb_last_start;
118
119 /* history to debug policy */
120 struct ext4_mb_history *s_mb_history;
121 int s_mb_history_cur;
122 int s_mb_history_max;
123 int s_mb_history_num;
124 struct proc_dir_entry *s_mb_proc;
125 spinlock_t s_mb_history_lock;
126 int s_mb_history_filter;
127
128 /* stats for buddy allocator */
129 spinlock_t s_mb_pa_lock;
130 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
131 atomic_t s_bal_success; /* we found long enough chunks */
132 atomic_t s_bal_allocated; /* in blocks */
133 atomic_t s_bal_ex_scanned; /* total extents scanned */
134 atomic_t s_bal_goals; /* goal hits */
135 atomic_t s_bal_breaks; /* too long searches */
136 atomic_t s_bal_2orders; /* 2^order hits */
137 spinlock_t s_bal_lock;
138 unsigned long s_mb_buddies_generated;
139 unsigned long long s_mb_generation_time;
140 atomic_t s_mb_lost_chunks;
141 atomic_t s_mb_preallocated;
142 atomic_t s_mb_discarded;
143
144 /* locality groups */
145 struct ext4_locality_group *s_locality_groups;
146};
147
148#endif /* _LINUX_EXT4_FS_SB */
diff --git a/include/linux/ext4_jbd2.h b/include/linux/ext4_jbd2.h
deleted file mode 100644
index 38c71d3c8dbf..000000000000
--- a/include/linux/ext4_jbd2.h
+++ /dev/null
@@ -1,231 +0,0 @@
1/*
2 * linux/include/linux/ext4_jbd2.h
3 *
4 * Written by Stephen C. Tweedie <sct@redhat.com>, 1999
5 *
6 * Copyright 1998--1999 Red Hat corp --- All Rights Reserved
7 *
8 * This file is part of the Linux kernel and is made available under
9 * the terms of the GNU General Public License, version 2, or at your
10 * option, any later version, incorporated herein by reference.
11 *
12 * Ext4-specific journaling extensions.
13 */
14
15#ifndef _LINUX_EXT4_JBD2_H
16#define _LINUX_EXT4_JBD2_H
17
18#include <linux/fs.h>
19#include <linux/jbd2.h>
20#include <linux/ext4_fs.h>
21
22#define EXT4_JOURNAL(inode) (EXT4_SB((inode)->i_sb)->s_journal)
23
24/* Define the number of blocks we need to account to a transaction to
25 * modify one block of data.
26 *
27 * We may have to touch one inode, one bitmap buffer, up to three
28 * indirection blocks, the group and superblock summaries, and the data
29 * block to complete the transaction.
30 *
31 * For extents-enabled fs we may have to allocate and modify up to
32 * 5 levels of tree + root which are stored in the inode. */
33
34#define EXT4_SINGLEDATA_TRANS_BLOCKS(sb) \
35 (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS) \
36 || test_opt(sb, EXTENTS) ? 27U : 8U)
37
38/* Extended attribute operations touch at most two data buffers,
39 * two bitmap buffers, and two group summaries, in addition to the inode
40 * and the superblock, which are already accounted for. */
41
42#define EXT4_XATTR_TRANS_BLOCKS 6U
43
44/* Define the minimum size for a transaction which modifies data. This
45 * needs to take into account the fact that we may end up modifying two
46 * quota files too (one for the group, one for the user quota). The
47 * superblock only gets updated once, of course, so don't bother
48 * counting that again for the quota updates. */
49
50#define EXT4_DATA_TRANS_BLOCKS(sb) (EXT4_SINGLEDATA_TRANS_BLOCKS(sb) + \
51 EXT4_XATTR_TRANS_BLOCKS - 2 + \
52 2*EXT4_QUOTA_TRANS_BLOCKS(sb))
53
54/* Delete operations potentially hit one directory's namespace plus an
55 * entire inode, plus arbitrary amounts of bitmap/indirection data. Be
56 * generous. We can grow the delete transaction later if necessary. */
57
58#define EXT4_DELETE_TRANS_BLOCKS(sb) (2 * EXT4_DATA_TRANS_BLOCKS(sb) + 64)
59
60/* Define an arbitrary limit for the amount of data we will anticipate
61 * writing to any given transaction. For unbounded transactions such as
62 * write(2) and truncate(2) we can write more than this, but we always
63 * start off at the maximum transaction size and grow the transaction
64 * optimistically as we go. */
65
66#define EXT4_MAX_TRANS_DATA 64U
67
68/* We break up a large truncate or write transaction once the handle's
69 * buffer credits gets this low, we need either to extend the
70 * transaction or to start a new one. Reserve enough space here for
71 * inode, bitmap, superblock, group and indirection updates for at least
72 * one block, plus two quota updates. Quota allocations are not
73 * needed. */
74
75#define EXT4_RESERVE_TRANS_BLOCKS 12U
76
77#define EXT4_INDEX_EXTRA_TRANS_BLOCKS 8
78
79#ifdef CONFIG_QUOTA
80/* Amount of blocks needed for quota update - we know that the structure was
81 * allocated so we need to update only inode+data */
82#define EXT4_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0)
83/* Amount of blocks needed for quota insert/delete - we do some block writes
84 * but inode, sb and group updates are done only once */
85#define EXT4_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\
86 (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_INIT_REWRITE) : 0)
87#define EXT4_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
88 (EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)+3+DQUOT_DEL_REWRITE) : 0)
89#else
90#define EXT4_QUOTA_TRANS_BLOCKS(sb) 0
91#define EXT4_QUOTA_INIT_BLOCKS(sb) 0
92#define EXT4_QUOTA_DEL_BLOCKS(sb) 0
93#endif
94
95int
96ext4_mark_iloc_dirty(handle_t *handle,
97 struct inode *inode,
98 struct ext4_iloc *iloc);
99
100/*
101 * On success, We end up with an outstanding reference count against
102 * iloc->bh. This _must_ be cleaned up later.
103 */
104
105int ext4_reserve_inode_write(handle_t *handle, struct inode *inode,
106 struct ext4_iloc *iloc);
107
108int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode);
109
110/*
111 * Wrapper functions with which ext4 calls into JBD. The intent here is
112 * to allow these to be turned into appropriate stubs so ext4 can control
113 * ext2 filesystems, so ext2+ext4 systems only nee one fs. This work hasn't
114 * been done yet.
115 */
116
117static inline void ext4_journal_release_buffer(handle_t *handle,
118 struct buffer_head *bh)
119{
120 jbd2_journal_release_buffer(handle, bh);
121}
122
123void ext4_journal_abort_handle(const char *caller, const char *err_fn,
124 struct buffer_head *bh, handle_t *handle, int err);
125
126int __ext4_journal_get_undo_access(const char *where, handle_t *handle,
127 struct buffer_head *bh);
128
129int __ext4_journal_get_write_access(const char *where, handle_t *handle,
130 struct buffer_head *bh);
131
132int __ext4_journal_forget(const char *where, handle_t *handle,
133 struct buffer_head *bh);
134
135int __ext4_journal_revoke(const char *where, handle_t *handle,
136 ext4_fsblk_t blocknr, struct buffer_head *bh);
137
138int __ext4_journal_get_create_access(const char *where,
139 handle_t *handle, struct buffer_head *bh);
140
141int __ext4_journal_dirty_metadata(const char *where,
142 handle_t *handle, struct buffer_head *bh);
143
144#define ext4_journal_get_undo_access(handle, bh) \
145 __ext4_journal_get_undo_access(__FUNCTION__, (handle), (bh))
146#define ext4_journal_get_write_access(handle, bh) \
147 __ext4_journal_get_write_access(__FUNCTION__, (handle), (bh))
148#define ext4_journal_revoke(handle, blocknr, bh) \
149 __ext4_journal_revoke(__FUNCTION__, (handle), (blocknr), (bh))
150#define ext4_journal_get_create_access(handle, bh) \
151 __ext4_journal_get_create_access(__FUNCTION__, (handle), (bh))
152#define ext4_journal_dirty_metadata(handle, bh) \
153 __ext4_journal_dirty_metadata(__FUNCTION__, (handle), (bh))
154#define ext4_journal_forget(handle, bh) \
155 __ext4_journal_forget(__FUNCTION__, (handle), (bh))
156
157int ext4_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
158
159handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks);
160int __ext4_journal_stop(const char *where, handle_t *handle);
161
162static inline handle_t *ext4_journal_start(struct inode *inode, int nblocks)
163{
164 return ext4_journal_start_sb(inode->i_sb, nblocks);
165}
166
167#define ext4_journal_stop(handle) \
168 __ext4_journal_stop(__FUNCTION__, (handle))
169
170static inline handle_t *ext4_journal_current_handle(void)
171{
172 return journal_current_handle();
173}
174
175static inline int ext4_journal_extend(handle_t *handle, int nblocks)
176{
177 return jbd2_journal_extend(handle, nblocks);
178}
179
180static inline int ext4_journal_restart(handle_t *handle, int nblocks)
181{
182 return jbd2_journal_restart(handle, nblocks);
183}
184
185static inline int ext4_journal_blocks_per_page(struct inode *inode)
186{
187 return jbd2_journal_blocks_per_page(inode);
188}
189
190static inline int ext4_journal_force_commit(journal_t *journal)
191{
192 return jbd2_journal_force_commit(journal);
193}
194
195/* super.c */
196int ext4_force_commit(struct super_block *sb);
197
198static inline int ext4_should_journal_data(struct inode *inode)
199{
200 if (!S_ISREG(inode->i_mode))
201 return 1;
202 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
203 return 1;
204 if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
205 return 1;
206 return 0;
207}
208
209static inline int ext4_should_order_data(struct inode *inode)
210{
211 if (!S_ISREG(inode->i_mode))
212 return 0;
213 if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
214 return 0;
215 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
216 return 1;
217 return 0;
218}
219
220static inline int ext4_should_writeback_data(struct inode *inode)
221{
222 if (!S_ISREG(inode->i_mode))
223 return 0;
224 if (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL)
225 return 0;
226 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
227 return 1;
228 return 0;
229}
230
231#endif /* _LINUX_EXT4_JBD2_H */
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