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ext4: Enhance ext4_grp_locked_error() to take block and function numbers
[deliverable/linux.git] / fs / ext4 / ext4.h
CommitLineData
ac27a0ec 1/*
3dcf5451 2 * ext4.h
ac27a0ec
DK		 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
3dcf5451
CH		 16#ifndef _EXT4_H
17#define _EXT4_H
ac27a0ec
DK		 18
19#include <linux/types.h>
3a5b2ecd 20#include <linux/blkdev.h>
ac27a0ec 21#include <linux/magic.h>
2ccb5fb9 22#include <linux/jbd2.h>
60e58e0f 23#include <linux/quota.h>
d444c3c3
TT		 24#include <linux/rwsem.h>
25#include <linux/rbtree.h>
26#include <linux/seqlock.h>
27#include <linux/mutex.h>
ca0faba0
TT		 28#include <linux/timer.h>
29#include <linux/wait.h>
30#include <linux/blockgroup_lock.h>
31#include <linux/percpu_counter.h>
4d92dc0f
BH		 32#ifdef __KERNEL__
33#include <linux/compat.h>
34#endif
c9de560d 35
ac27a0ec 36/*
8a35694e 37 * The fourth extended filesystem constants/structures
ac27a0ec
DK		 38 */
39
40/*
617ba13b 41 * Define EXT4FS_DEBUG to produce debug messages
ac27a0ec 42 */
617ba13b 43#undef EXT4FS_DEBUG
ac27a0ec 44
ac27a0ec
DK		 45/*
46 * Debug code
47 */
617ba13b
MC		 48#ifdef EXT4FS_DEBUG
49#define ext4_debug(f, a...) \
ac27a0ec 50 do { \
af5bc92d 51 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
4db9c54a 52 __FILE__, __LINE__, __func__); \
af5bc92d 53 printk(KERN_DEBUG f, ## a); \
ac27a0ec
DK		 54 } while (0)
55#else
617ba13b 56#define ext4_debug(f, a...) do {} while (0)
ac27a0ec
DK		 57#endif
58
273df556 59#define EXT4_ERROR_INODE(inode, fmt, a...) \
24676da4 60 ext4_error_inode(__func__, (inode), (fmt), ## a)
273df556
FM		 61
62#define EXT4_ERROR_FILE(file, fmt, a...) \
24676da4 63 ext4_error_file(__func__, (file), (fmt), ## a)
273df556 64
d444c3c3
TT		 65/* data type for block offset of block group */
66typedef int ext4_grpblk_t;
67
68/* data type for filesystem-wide blocks number */
69typedef unsigned long long ext4_fsblk_t;
70
71/* data type for file logical block number */
72typedef __u32 ext4_lblk_t;
73
74/* data type for block group number */
75typedef unsigned int ext4_group_t;
76
296c355c 77/*
60e6679e 78 * Flags used in mballoc's allocation_context flags field.
296c355c
TT		 79 *
80 * Also used to show what's going on for debugging purposes when the
81 * flag field is exported via the traceport interface
82 */
d444c3c3 83
c9de560d 84/* prefer goal again. length */
0ef90db9 85#define EXT4_MB_HINT_MERGE 0x0001
c9de560d 86/* blocks already reserved */
0ef90db9 87#define EXT4_MB_HINT_RESERVED 0x0002
c9de560d 88/* metadata is being allocated */
0ef90db9 89#define EXT4_MB_HINT_METADATA 0x0004
c9de560d 90/* first blocks in the file */
0ef90db9 91#define EXT4_MB_HINT_FIRST 0x0008
c9de560d 92/* search for the best chunk */
0ef90db9 93#define EXT4_MB_HINT_BEST 0x0010
c9de560d 94/* data is being allocated */
0ef90db9 95#define EXT4_MB_HINT_DATA 0x0020
c9de560d 96/* don't preallocate (for tails) */
0ef90db9 97#define EXT4_MB_HINT_NOPREALLOC 0x0040
c9de560d 98/* allocate for locality group */
0ef90db9 99#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
c9de560d 100/* allocate goal blocks or none */
0ef90db9 101#define EXT4_MB_HINT_GOAL_ONLY 0x0100
c9de560d 102/* goal is meaningful */
0ef90db9 103#define EXT4_MB_HINT_TRY_GOAL 0x0200
d2a17637 104/* blocks already pre-reserved by delayed allocation */
0ef90db9 105#define EXT4_MB_DELALLOC_RESERVED 0x0400
4ba74d00
TT		 106/* We are doing stream allocation */
107#define EXT4_MB_STREAM_ALLOC 0x0800
d2a17637 108
c9de560d
AT		 109
110struct ext4_allocation_request {
111 /* target inode for block we're allocating */
112 struct inode *inode;
726447d8
ES		 113 /* how many blocks we want to allocate */
114 unsigned int len;
c9de560d
AT		 115 /* logical block in target inode */
116 ext4_lblk_t logical;
c9de560d
AT		 117 /* the closest logical allocated block to the left */
118 ext4_lblk_t lleft;
c9de560d
AT		 119 /* the closest logical allocated block to the right */
120 ext4_lblk_t lright;
726447d8
ES		 121 /* phys. target (a hint) */
122 ext4_fsblk_t goal;
123 /* phys. block for the closest logical allocated block to the left */
124 ext4_fsblk_t pleft;
125 /* phys. block for the closest logical allocated block to the right */
c9de560d 126 ext4_fsblk_t pright;
c9de560d 127 /* flags. see above EXT4_MB_HINT_* */
498e5f24 128 unsigned int flags;
c9de560d
AT		 129};
130
e35fd660
TT		 131/*
132 * Logical to physical block mapping, used by ext4_map_blocks()
133 *
134 * This structure is used to pass requests into ext4_map_blocks() as
135 * well as to store the information returned by ext4_map_blocks(). It
136 * takes less room on the stack than a struct buffer_head.
137 */
138#define EXT4_MAP_NEW (1 << BH_New)
139#define EXT4_MAP_MAPPED (1 << BH_Mapped)
140#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
141#define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
142#define EXT4_MAP_UNINIT (1 << BH_Uninit)
143#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
144 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
145 EXT4_MAP_UNINIT)
146
147struct ext4_map_blocks {
148 ext4_fsblk_t m_pblk;
149 ext4_lblk_t m_lblk;
150 unsigned int m_len;
151 unsigned int m_flags;
152};
153
b3a3ca8c
TT		 154/*
155 * For delayed allocation tracking
156 */
157struct mpage_da_data {
158 struct inode *inode;
159 sector_t b_blocknr; /* start block number of extent */
160 size_t b_size; /* size of extent */
161 unsigned long b_state; /* state of the extent */
162 unsigned long first_page, next_page; /* extent of pages */
163 struct writeback_control *wbc;
164 int io_done;
165 int pages_written;
166 int retval;
167};
c7064ef1 168#define EXT4_IO_UNWRITTEN 0x1
0031462b 169typedef struct ext4_io_end {
8d5d02e6 170 struct list_head list; /* per-file finished AIO list */
0031462b 171 struct inode *inode; /* file being written to */
8d5d02e6 172 unsigned int flag; /* unwritten or not */
744692dc 173 struct page *page; /* page struct for buffer write */
a1de02dc
ES		 174 loff_t offset; /* offset in the file */
175 ssize_t size; /* size of the extent */
0031462b
MC		 176 struct work_struct work; /* data work queue */
177} ext4_io_end_t;
178
ac27a0ec
DK		 179/*
180 * Special inodes numbers
181 */
617ba13b
MC		 182#define EXT4_BAD_INO 1 /* Bad blocks inode */
183#define EXT4_ROOT_INO 2 /* Root inode */
184#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
185#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
186#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
187#define EXT4_JOURNAL_INO 8 /* Journal inode */
ac27a0ec 188
617ba13b
MC		 189/* First non-reserved inode for old ext4 filesystems */
190#define EXT4_GOOD_OLD_FIRST_INO 11
ac27a0ec
DK		 191
192/*
193 * Maximal count of links to a file
194 */
f8628a14 195#define EXT4_LINK_MAX 65000
ac27a0ec
DK		 196
197/*
198 * Macro-instructions used to manage several block sizes
199 */
617ba13b 200#define EXT4_MIN_BLOCK_SIZE 1024
afc7cbca
TS		 201#define EXT4_MAX_BLOCK_SIZE 65536
202#define EXT4_MIN_BLOCK_LOG_SIZE 10
ac27a0ec 203#ifdef __KERNEL__
617ba13b 204# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
ac27a0ec 205#else
617ba13b 206# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
ac27a0ec 207#endif
af5bc92d 208#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
ac27a0ec 209#ifdef __KERNEL__
617ba13b 210# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
ac27a0ec 211#else
617ba13b 212# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
ac27a0ec
DK		 213#endif
214#ifdef __KERNEL__
617ba13b
MC		 215#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
216#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
217#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
ac27a0ec 218#else
617ba13b
MC		 219#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
220 EXT4_GOOD_OLD_INODE_SIZE : \
ac27a0ec 221 (s)->s_inode_size)
617ba13b
MC		 222#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
223 EXT4_GOOD_OLD_FIRST_INO : \
ac27a0ec
DK		 224 (s)->s_first_ino)
225#endif
a2df2a63 226#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
ac27a0ec 227
ac27a0ec
DK		 228/*
229 * Structure of a blocks group descriptor
230 */
617ba13b 231struct ext4_group_desc
ac27a0ec 232{
3a14589c 233 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
5272f837
AK		 234 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
235 __le32 bg_inode_table_lo; /* Inodes table block */
560671a0
AK		 236 __le16 bg_free_blocks_count_lo;/* Free blocks count */
237 __le16 bg_free_inodes_count_lo;/* Free inodes count */
238 __le16 bg_used_dirs_count_lo; /* Directories count */
717d50e4
AD		 239 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
240 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
560671a0 241 __le16 bg_itable_unused_lo; /* Unused inodes count */
717d50e4 242 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
8fadc143
AR		 243 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
244 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
245 __le32 bg_inode_table_hi; /* Inodes table block MSB */
91b51a01
CL		 246 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
247 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
248 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
560671a0 249 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
91b51a01 250 __u32 bg_reserved2[3];
ac27a0ec
DK		 251};
252
772cb7c8
JS		 253/*
254 * Structure of a flex block group info
255 */
256
257struct flex_groups {
9f24e420
TT		 258 atomic_t free_inodes;
259 atomic_t free_blocks;
7d39db14 260 atomic_t used_dirs;
772cb7c8
JS		 261};
262
717d50e4
AD		 263#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
264#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
265#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
266
ac27a0ec
DK		 267/*
268 * Macro-instructions used to manage group descriptors
269 */
0d1ee42f 270#define EXT4_MIN_DESC_SIZE 32
8fadc143 271#define EXT4_MIN_DESC_SIZE_64BIT 64
0d1ee42f
AR		 272#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
273#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
ac27a0ec 274#ifdef __KERNEL__
617ba13b
MC		 275# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
276# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
277# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
278# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
ac27a0ec 279#else
617ba13b 280# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
0d1ee42f 281# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
617ba13b 282# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
ac27a0ec
DK		 283#endif
284
285/*
286 * Constants relative to the data blocks
287 */
617ba13b
MC		 288#define EXT4_NDIR_BLOCKS 12
289#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
290#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
291#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
292#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
ac27a0ec
DK		 293
294/*
295 * Inode flags
296 */
617ba13b
MC		 297#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
298#define EXT4_UNRM_FL 0x00000002 /* Undelete */
299#define EXT4_COMPR_FL 0x00000004 /* Compress file */
300#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
301#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
302#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
303#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
304#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
ac27a0ec 305/* Reserved for compression usage... */
617ba13b
MC		 306#define EXT4_DIRTY_FL 0x00000100
307#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
308#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
309#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
ac27a0ec 310/* End compression flags --- maybe not all used */
617ba13b
MC		 311#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
312#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
313#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
314#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
315#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
316#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
8180a562 317#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
a86c6181 318#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
f710b4b9 319#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
c8d46e41 320#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
8180a562 321#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
ac27a0ec 322
c8d46e41
JZ		 323#define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
324#define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
ac27a0ec 325
8fa43a81
DG		 326/* Flags that should be inherited by new inodes from their parent. */
327#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
328 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
329 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
330 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
331 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
332
2dc6b0d4
DG		 333/* Flags that are appropriate for regular files (all but dir-specific ones). */
334#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
335
336/* Flags that are appropriate for non-directories/regular files. */
337#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
338
339/* Mask out flags that are inappropriate for the given type of inode. */
340static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
341{
342 if (S_ISDIR(mode))
343 return flags;
344 else if (S_ISREG(mode))
345 return flags & EXT4_REG_FLMASK;
346 else
347 return flags & EXT4_OTHER_FLMASK;
348}
349
12e9b892
DM		 350/*
351 * Inode flags used for atomic set/get
352 */
353enum {
354 EXT4_INODE_SECRM = 0, /* Secure deletion */
355 EXT4_INODE_UNRM = 1, /* Undelete */
356 EXT4_INODE_COMPR = 2, /* Compress file */
357 EXT4_INODE_SYNC = 3, /* Synchronous updates */
358 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
359 EXT4_INODE_APPEND = 5, /* writes to file may only append */
360 EXT4_INODE_NODUMP = 6, /* do not dump file */
361 EXT4_INODE_NOATIME = 7, /* do not update atime */
362/* Reserved for compression usage... */
363 EXT4_INODE_DIRTY = 8,
364 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
365 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
366 EXT4_INODE_ECOMPR = 11, /* Compression error */
367/* End compression flags --- maybe not all used */
368 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
369 EXT4_INODE_IMAGIC = 13, /* AFS directory */
370 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
371 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
372 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
373 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
374 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
375 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
376 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
377 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
378 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
379};
380
381#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
382#define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
383 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
384 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
385
386/*
387 * Since it's pretty easy to mix up bit numbers and hex values, and we
388 * can't do a compile-time test for ENUM values, we use a run-time
389 * test to make sure that EXT4_XXX_FL is consistent with respect to
390 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop
391 * out so it won't cost any extra space in the compiled kernel image.
392 * But it's important that these values are the same, since we are
393 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
394 * must be consistent with the values of FS_XXX_FL defined in
395 * include/linux/fs.h and the on-disk values found in ext2, ext3, and
396 * ext4 filesystems, and of course the values defined in e2fsprogs.
397 *
398 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
399 */
400static inline void ext4_check_flag_values(void)
401{
402 CHECK_FLAG_VALUE(SECRM);
403 CHECK_FLAG_VALUE(UNRM);
404 CHECK_FLAG_VALUE(COMPR);
405 CHECK_FLAG_VALUE(SYNC);
406 CHECK_FLAG_VALUE(IMMUTABLE);
407 CHECK_FLAG_VALUE(APPEND);
408 CHECK_FLAG_VALUE(NODUMP);
409 CHECK_FLAG_VALUE(NOATIME);
410 CHECK_FLAG_VALUE(DIRTY);
411 CHECK_FLAG_VALUE(COMPRBLK);
412 CHECK_FLAG_VALUE(NOCOMPR);
413 CHECK_FLAG_VALUE(ECOMPR);
414 CHECK_FLAG_VALUE(INDEX);
415 CHECK_FLAG_VALUE(IMAGIC);
416 CHECK_FLAG_VALUE(JOURNAL_DATA);
417 CHECK_FLAG_VALUE(NOTAIL);
418 CHECK_FLAG_VALUE(DIRSYNC);
419 CHECK_FLAG_VALUE(TOPDIR);
420 CHECK_FLAG_VALUE(HUGE_FILE);
421 CHECK_FLAG_VALUE(EXTENTS);
422 CHECK_FLAG_VALUE(EA_INODE);
423 CHECK_FLAG_VALUE(EOFBLOCKS);
424 CHECK_FLAG_VALUE(RESERVED);
425}
426
ac27a0ec 427/* Used to pass group descriptor data when online resize is done */
617ba13b 428struct ext4_new_group_input {
8c55e204
DK		 429 __u32 group; /* Group number for this data */
430 __u64 block_bitmap; /* Absolute block number of block bitmap */
431 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
432 __u64 inode_table; /* Absolute block number of inode table start */
433 __u32 blocks_count; /* Total number of blocks in this group */
434 __u16 reserved_blocks; /* Number of reserved blocks in this group */
ac27a0ec
DK		 435 __u16 unused;
436};
437
4d92dc0f
BH		 438#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
439struct compat_ext4_new_group_input {
440 u32 group;
441 compat_u64 block_bitmap;
442 compat_u64 inode_bitmap;
443 compat_u64 inode_table;
444 u32 blocks_count;
445 u16 reserved_blocks;
446 u16 unused;
447};
448#endif
449
617ba13b
MC		 450/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
451struct ext4_new_group_data {
ac27a0ec 452 __u32 group;
bd81d8ee
LV		 453 __u64 block_bitmap;
454 __u64 inode_bitmap;
455 __u64 inode_table;
ac27a0ec
DK		 456 __u32 blocks_count;
457 __u16 reserved_blocks;
458 __u16 unused;
459 __u32 free_blocks_count;
460};
461
a2df2a63 462/*
c2177057 463 * Flags used by ext4_get_blocks()
a2df2a63 464 */
c2177057
TT		 465 /* Allocate any needed blocks and/or convert an unitialized
466 extent to be an initialized ext4 */
2ac3b6e0 467#define EXT4_GET_BLOCKS_CREATE 0x0001
c2177057 468 /* Request the creation of an unitialized extent */
2ac3b6e0 469#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
c2177057
TT		 470#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
471 EXT4_GET_BLOCKS_CREATE)
c2177057 472 /* Caller is from the delayed allocation writeout path,
60e6679e 473 so set the magic i_delalloc_reserve_flag after taking the
2ac3b6e0 474 inode allocation semaphore for */
03f5d8bc 475#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
0031462b
MC		 476 /* caller is from the direct IO path, request to creation of an
477 unitialized extents if not allocated, split the uninitialized
478 extent if blocks has been preallocated already*/
c7064ef1 479#define EXT4_GET_BLOCKS_PRE_IO 0x0008
1296cc85 480#define EXT4_GET_BLOCKS_CONVERT 0x0010
c7064ef1 481#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
0031462b 482 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
c7064ef1
JZ		 483 /* Convert extent to initialized after IO complete */
484#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
0031462b 485 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
ac27a0ec 486
e6362609
TT		 487/*
488 * Flags used by ext4_free_blocks
489 */
490#define EXT4_FREE_BLOCKS_METADATA 0x0001
491#define EXT4_FREE_BLOCKS_FORGET 0x0002
1f2acb60 492#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
e6362609 493
ac27a0ec
DK		 494/*
495 * ioctl commands
496 */
617ba13b
MC		 497#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
498#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
499#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
500#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
617ba13b
MC		 501#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
502#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
e23291b9 503#ifdef CONFIG_JBD2_DEBUG
617ba13b 504#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
ac27a0ec 505#endif
617ba13b
MC		 506#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
507#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
8eea80d5
TT		 508#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
509#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
510#define EXT4_IOC_MIGRATE _IO('f', 9)
ccd2506b 511 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
8eea80d5 512 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
ccd2506b 513#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
748de673 514#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
ac27a0ec 515
899ad0ce 516#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
ac27a0ec
DK		 517/*
518 * ioctl commands in 32 bit emulation
519 */
617ba13b
MC		 520#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
521#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
522#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
523#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
524#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
525#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
526#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
4d92dc0f 527#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
e23291b9 528#ifdef CONFIG_JBD2_DEBUG
617ba13b 529#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
ac27a0ec 530#endif
617ba13b
MC		 531#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
532#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
899ad0ce 533#endif
ac27a0ec
DK		 534
535
536/*
537 * Mount options
538 */
617ba13b 539struct ext4_mount_options {
ac27a0ec
DK		 540 unsigned long s_mount_opt;
541 uid_t s_resuid;
542 gid_t s_resgid;
543 unsigned long s_commit_interval;
30773840 544 u32 s_min_batch_time, s_max_batch_time;
ac27a0ec
DK		 545#ifdef CONFIG_QUOTA
546 int s_jquota_fmt;
547 char *s_qf_names[MAXQUOTAS];
548#endif
549};
550
fb0a387d
ES		 551/* Max physical block we can addres w/o extents */
552#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
553
ac27a0ec
DK		 554/*
555 * Structure of an inode on the disk
556 */
617ba13b 557struct ext4_inode {
ac27a0ec
DK		 558 __le16 i_mode; /* File mode */
559 __le16 i_uid; /* Low 16 bits of Owner Uid */
a48380f7 560 __le32 i_size_lo; /* Size in bytes */
ac27a0ec 561 __le32 i_atime; /* Access time */
ef7f3835 562 __le32 i_ctime; /* Inode Change time */
ac27a0ec
DK		 563 __le32 i_mtime; /* Modification time */
564 __le32 i_dtime; /* Deletion Time */
565 __le16 i_gid; /* Low 16 bits of Group Id */
566 __le16 i_links_count; /* Links count */
0fc1b451 567 __le32 i_blocks_lo; /* Blocks count */
ac27a0ec
DK		 568 __le32 i_flags; /* File flags */
569 union {
570 struct {
25ec56b5 571 __le32 l_i_version;
ac27a0ec
DK		 572 } linux1;
573 struct {
574 __u32 h_i_translator;
575 } hurd1;
576 struct {
577 __u32 m_i_reserved1;
578 } masix1;
579 } osd1; /* OS dependent 1 */
617ba13b 580 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
ac27a0ec 581 __le32 i_generation; /* File version (for NFS) */
7973c0c1 582 __le32 i_file_acl_lo; /* File ACL */
a48380f7 583 __le32 i_size_high;
f077d0d7 584 __le32 i_obso_faddr; /* Obsoleted fragment address */
ac27a0ec
DK		 585 union {
586 struct {
0fc1b451 587 __le16 l_i_blocks_high; /* were l_i_reserved1 */
a1ddeb7e 588 __le16 l_i_file_acl_high;
8c55e204 589 __le16 l_i_uid_high; /* these 2 fields */
ac27a0ec
DK		 590 __le16 l_i_gid_high; /* were reserved2[0] */
591 __u32 l_i_reserved2;
592 } linux2;
593 struct {
f077d0d7 594 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
ac27a0ec
DK		 595 __u16 h_i_mode_high;
596 __u16 h_i_uid_high;
597 __u16 h_i_gid_high;
598 __u32 h_i_author;
599 } hurd2;
600 struct {
f077d0d7 601 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
a1ddeb7e 602 __le16 m_i_file_acl_high;
ac27a0ec
DK		 603 __u32 m_i_reserved2[2];
604 } masix2;
605 } osd2; /* OS dependent 2 */
606 __le16 i_extra_isize;
607 __le16 i_pad1;
ef7f3835
KS		 608 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
609 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
610 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
611 __le32 i_crtime; /* File Creation time */
612 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
25ec56b5 613 __le32 i_version_hi; /* high 32 bits for 64-bit version */
ac27a0ec
DK		 614};
615
748de673
AF		 616struct move_extent {
617 __u32 reserved; /* should be zero */
618 __u32 donor_fd; /* donor file descriptor */
619 __u64 orig_start; /* logical start offset in block for orig */
620 __u64 donor_start; /* logical start offset in block for donor */
621 __u64 len; /* block length to be moved */
622 __u64 moved_len; /* moved block length */
623};
ac27a0ec 624
ef7f3835
KS		 625#define EXT4_EPOCH_BITS 2
626#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
627#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
628
629/*
630 * Extended fields will fit into an inode if the filesystem was formatted
631 * with large inodes (-I 256 or larger) and there are not currently any EAs
632 * consuming all of the available space. For new inodes we always reserve
633 * enough space for the kernel's known extended fields, but for inodes
634 * created with an old kernel this might not have been the case. None of
635 * the extended inode fields is critical for correct filesystem operation.
636 * This macro checks if a certain field fits in the inode. Note that
637 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
638 */
639#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
640 ((offsetof(typeof(*ext4_inode), field) + \
641 sizeof((ext4_inode)->field)) \
642 <= (EXT4_GOOD_OLD_INODE_SIZE + \
643 (einode)->i_extra_isize)) \
644
645static inline __le32 ext4_encode_extra_time(struct timespec *time)
646{
647 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
c1fccc06
TT		 648 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
649 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
ef7f3835
KS		 650}
651
652static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
653{
654 if (sizeof(time->tv_sec) > 4)
655 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
656 << 32;
c1fccc06 657 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
ef7f3835
KS		 658}
659
660#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
661do { \
662 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
663 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
664 (raw_inode)->xtime ## _extra = \
665 ext4_encode_extra_time(&(inode)->xtime); \
666} while (0)
667
668#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
669do { \
670 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
671 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
672 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
673 (raw_inode)->xtime ## _extra = \
674 ext4_encode_extra_time(&(einode)->xtime); \
675} while (0)
676
677#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
678do { \
679 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
680 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
681 ext4_decode_extra_time(&(inode)->xtime, \
682 raw_inode->xtime ## _extra); \
683} while (0)
684
685#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
686do { \
687 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
688 (einode)->xtime.tv_sec = \
689 (signed)le32_to_cpu((raw_inode)->xtime); \
690 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
691 ext4_decode_extra_time(&(einode)->xtime, \
692 raw_inode->xtime ## _extra); \
693} while (0)
694
25ec56b5
JNC		 695#define i_disk_version osd1.linux1.l_i_version
696
ac27a0ec
DK		 697#if defined(__KERNEL__) || defined(__linux__)
698#define i_reserved1 osd1.linux1.l_i_reserved1
a1ddeb7e 699#define i_file_acl_high osd2.linux2.l_i_file_acl_high
0fc1b451 700#define i_blocks_high osd2.linux2.l_i_blocks_high
ac27a0ec
DK		 701#define i_uid_low i_uid
702#define i_gid_low i_gid
703#define i_uid_high osd2.linux2.l_i_uid_high
704#define i_gid_high osd2.linux2.l_i_gid_high
705#define i_reserved2 osd2.linux2.l_i_reserved2
706
707#elif defined(__GNU__)
708
709#define i_translator osd1.hurd1.h_i_translator
ac27a0ec
DK		 710#define i_uid_high osd2.hurd2.h_i_uid_high
711#define i_gid_high osd2.hurd2.h_i_gid_high
712#define i_author osd2.hurd2.h_i_author
713
714#elif defined(__masix__)
715
716#define i_reserved1 osd1.masix1.m_i_reserved1
a1ddeb7e 717#define i_file_acl_high osd2.masix2.m_i_file_acl_high
ac27a0ec
DK		 718#define i_reserved2 osd2.masix2.m_i_reserved2
719
720#endif /* defined(__KERNEL__) || defined(__linux__) */
721
d444c3c3
TT		 722/*
723 * storage for cached extent
724 */
725struct ext4_ext_cache {
726 ext4_fsblk_t ec_start;
727 ext4_lblk_t ec_block;
728 __u32 ec_len; /* must be 32bit to return holes */
729 __u32 ec_type;
730};
731
732/*
733 * fourth extended file system inode data in memory
734 */
735struct ext4_inode_info {
736 __le32 i_data[15]; /* unconverted */
d444c3c3 737 __u32 i_dtime;
12e9b892 738 ext4_fsblk_t i_file_acl;
d444c3c3
TT		 739
740 /*
741 * i_block_group is the number of the block group which contains
742 * this file's inode. Constant across the lifetime of the inode,
743 * it is ued for making block allocation decisions - we try to
744 * place a file's data blocks near its inode block, and new inodes
745 * near to their parent directory's inode.
746 */
747 ext4_group_t i_block_group;
19f5fb7a 748 unsigned long i_state_flags; /* Dynamic state flags */
12e9b892 749 unsigned long i_flags;
d444c3c3
TT		 750
751 ext4_lblk_t i_dir_start_lookup;
752#ifdef CONFIG_EXT4_FS_XATTR
753 /*
754 * Extended attributes can be read independently of the main file
755 * data. Taking i_mutex even when reading would cause contention
756 * between readers of EAs and writers of regular file data, so
757 * instead we synchronize on xattr_sem when reading or changing
758 * EAs.
759 */
760 struct rw_semaphore xattr_sem;
761#endif
d444c3c3
TT		 762
763 struct list_head i_orphan; /* unlinked but open inodes */
764
765 /*
766 * i_disksize keeps track of what the inode size is ON DISK, not
767 * in memory. During truncate, i_size is set to the new size by
768 * the VFS prior to calling ext4_truncate(), but the filesystem won't
769 * set i_disksize to 0 until the truncate is actually under way.
770 *
771 * The intent is that i_disksize always represents the blocks which
772 * are used by this file. This allows recovery to restart truncate
773 * on orphans if we crash during truncate. We actually write i_disksize
774 * into the on-disk inode when writing inodes out, instead of i_size.
775 *
776 * The only time when i_disksize and i_size may be different is when
777 * a truncate is in progress. The only things which change i_disksize
778 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
779 */
780 loff_t i_disksize;
781
782 /*
783 * i_data_sem is for serialising ext4_truncate() against
784 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
785 * data tree are chopped off during truncate. We can't do that in
786 * ext4 because whenever we perform intermediate commits during
787 * truncate, the inode and all the metadata blocks *must* be in a
788 * consistent state which allows truncation of the orphans to restart
789 * during recovery. Hence we must fix the get_block-vs-truncate race
790 * by other means, so we have i_data_sem.
791 */
792 struct rw_semaphore i_data_sem;
793 struct inode vfs_inode;
794 struct jbd2_inode jinode;
795
796 struct ext4_ext_cache i_cached_extent;
797 /*
798 * File creation time. Its function is same as that of
799 * struct timespec i_{a,c,m}time in the generic inode.
800 */
801 struct timespec i_crtime;
802
803 /* mballoc */
804 struct list_head i_prealloc_list;
805 spinlock_t i_prealloc_lock;
806
807 /* ialloc */
808 ext4_group_t i_last_alloc_group;
809
810 /* allocation reservation info for delalloc */
811 unsigned int i_reserved_data_blocks;
812 unsigned int i_reserved_meta_blocks;
813 unsigned int i_allocated_meta_blocks;
814 unsigned short i_delalloc_reserved_flag;
9d0be502
TT		 815 sector_t i_da_metadata_calc_last_lblock;
816 int i_da_metadata_calc_len;
d444c3c3
TT		 817
818 /* on-disk additional length */
819 __u16 i_extra_isize;
820
821 spinlock_t i_block_reservation_lock;
a9e7f447
DM		 822#ifdef CONFIG_QUOTA
823 /* quota space reservation, managed internally by quota code */
824 qsize_t i_reserved_quota;
825#endif
8d5d02e6 826
c7064ef1
JZ		 827 /* completed IOs that might need unwritten extents handling */
828 struct list_head i_completed_io_list;
744692dc 829 spinlock_t i_completed_io_lock;
8d5d02e6
MC		 830 /* current io_end structure for async DIO write*/
831 ext4_io_end_t *cur_aio_dio;
b436b9be
JK		 832
833 /*
834 * Transactions that contain inode's metadata needed to complete
835 * fsync and fdatasync, respectively.
836 */
837 tid_t i_sync_tid;
838 tid_t i_datasync_tid;
d444c3c3
TT		 839};
840
ac27a0ec
DK		 841/*
842 * File system states
843 */
617ba13b
MC		 844#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
845#define EXT4_ERROR_FS 0x0002 /* Errors detected */
846#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
ac27a0ec 847
469108ff
TT		 848/*
849 * Misc. filesystem flags
850 */
851#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
852#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
853#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
854
ac27a0ec
DK		 855/*
856 * Mount flags
857 */
617ba13b
MC		 858#define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
859#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
860#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
861#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
862#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
863#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
864#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
865#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
617ba13b
MC		 866#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
867#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
868#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
869#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
870#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
871#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
872#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
873#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
afd4672d 874#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
617ba13b 875#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
617ba13b
MC		 876#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
877#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
878#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
744692dc 879#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
d4da6c9c 880#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
818d276c 881#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
25ec56b5 882#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
64769240 883#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
5bf5683a 884#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
6fd058f7 885#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
5328e635 886#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
5bf5683a 887
617ba13b
MC		 888#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
889#define set_opt(o, opt) o |= EXT4_MOUNT_##opt
890#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
891 EXT4_MOUNT_##opt)
ac27a0ec 892
617ba13b
MC		 893#define ext4_set_bit ext2_set_bit
894#define ext4_set_bit_atomic ext2_set_bit_atomic
895#define ext4_clear_bit ext2_clear_bit
896#define ext4_clear_bit_atomic ext2_clear_bit_atomic
897#define ext4_test_bit ext2_test_bit
898#define ext4_find_first_zero_bit ext2_find_first_zero_bit
899#define ext4_find_next_zero_bit ext2_find_next_zero_bit
aa02ad67 900#define ext4_find_next_bit ext2_find_next_bit
ac27a0ec
DK		 901
902/*
903 * Maximal mount counts between two filesystem checks
904 */
617ba13b
MC		 905#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
906#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
ac27a0ec
DK		 907
908/*
909 * Behaviour when detecting errors
910 */
617ba13b
MC		 911#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
912#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
913#define EXT4_ERRORS_PANIC 3 /* Panic */
914#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
ac27a0ec
DK		 915
916/*
917 * Structure of the super block
918 */
617ba13b 919struct ext4_super_block {
ac27a0ec 920/*00*/ __le32 s_inodes_count; /* Inodes count */
6bc9feff 921 __le32 s_blocks_count_lo; /* Blocks count */
308ba3ec
AK		 922 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
923 __le32 s_free_blocks_count_lo; /* Free blocks count */
ac27a0ec
DK		 924/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
925 __le32 s_first_data_block; /* First Data Block */
926 __le32 s_log_block_size; /* Block size */
f077d0d7 927 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
ac27a0ec 928/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
f077d0d7 929 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
ac27a0ec
DK		 930 __le32 s_inodes_per_group; /* # Inodes per group */
931 __le32 s_mtime; /* Mount time */
932/*30*/ __le32 s_wtime; /* Write time */
933 __le16 s_mnt_count; /* Mount count */
934 __le16 s_max_mnt_count; /* Maximal mount count */
935 __le16 s_magic; /* Magic signature */
936 __le16 s_state; /* File system state */
937 __le16 s_errors; /* Behaviour when detecting errors */
938 __le16 s_minor_rev_level; /* minor revision level */
939/*40*/ __le32 s_lastcheck; /* time of last check */
940 __le32 s_checkinterval; /* max. time between checks */
941 __le32 s_creator_os; /* OS */
942 __le32 s_rev_level; /* Revision level */
943/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
944 __le16 s_def_resgid; /* Default gid for reserved blocks */
945 /*
617ba13b 946 * These fields are for EXT4_DYNAMIC_REV superblocks only.
ac27a0ec
DK		 947 *
948 * Note: the difference between the compatible feature set and
949 * the incompatible feature set is that if there is a bit set
950 * in the incompatible feature set that the kernel doesn't
951 * know about, it should refuse to mount the filesystem.
952 *
953 * e2fsck's requirements are more strict; if it doesn't know
954 * about a feature in either the compatible or incompatible
955 * feature set, it must abort and not try to meddle with
956 * things it doesn't understand...
957 */
958 __le32 s_first_ino; /* First non-reserved inode */
0d1ee42f 959 __le16 s_inode_size; /* size of inode structure */
ac27a0ec
DK		 960 __le16 s_block_group_nr; /* block group # of this superblock */
961 __le32 s_feature_compat; /* compatible feature set */
962/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
963 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
964/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
965/*78*/ char s_volume_name[16]; /* volume name */
966/*88*/ char s_last_mounted[64]; /* directory where last mounted */
967/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
968 /*
969 * Performance hints. Directory preallocation should only
617ba13b 970 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
ac27a0ec
DK		 971 */
972 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
973 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
974 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
975 /*
617ba13b 976 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
ac27a0ec
DK		 977 */
978/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
979/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
980 __le32 s_journal_dev; /* device number of journal file */
981 __le32 s_last_orphan; /* start of list of inodes to delete */
982 __le32 s_hash_seed[4]; /* HTREE hash seed */
983 __u8 s_def_hash_version; /* Default hash version to use */
984 __u8 s_reserved_char_pad;
0d1ee42f 985 __le16 s_desc_size; /* size of group descriptor */
bd81d8ee 986/*100*/ __le32 s_default_mount_opts;
ac27a0ec 987 __le32 s_first_meta_bg; /* First metablock block group */
bd81d8ee
LV		 988 __le32 s_mkfs_time; /* When the filesystem was created */
989 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
990 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
991/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
992 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
993 __le32 s_free_blocks_count_hi; /* Free blocks count */
c1bddad9
AK		 994 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
995 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
996 __le32 s_flags; /* Miscellaneous flags */
997 __le16 s_raid_stride; /* RAID stride */
998 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
999 __le64 s_mmp_block; /* Block for multi-mount protection */
1000 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
772cb7c8
JS		 1001 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1002 __u8 s_reserved_char_pad2;
1003 __le16 s_reserved_pad;
afc32f7e 1004 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
4a9cdec7
TT		 1005 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1006 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1007 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1008 snapshot's future use */
1009 __le32 s_snapshot_list; /* inode number of the head of the
1010 on-disk snapshot list */
1011 __u32 s_reserved[155]; /* Padding to the end of the block */
ac27a0ec
DK		 1012};
1013
1014#ifdef __KERNEL__
bc0b0d6d
TT		 1015
1016/*
4ab2f15b 1017 * run-time mount flags
bc0b0d6d
TT		 1018 */
1019#define EXT4_MF_MNTDIR_SAMPLED 0x0001
4ab2f15b 1020#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
bc0b0d6d 1021
ca0faba0
TT		 1022/*
1023 * fourth extended-fs super-block data in memory
1024 */
1025struct ext4_sb_info {
1026 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1027 unsigned long s_inodes_per_block;/* Number of inodes per block */
1028 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1029 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1030 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1031 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1032 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1033 ext4_group_t s_groups_count; /* Number of groups in the fs */
fb0a387d 1034 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
ca0faba0
TT		 1035 unsigned long s_overhead_last; /* Last calculated overhead */
1036 unsigned long s_blocks_last; /* Last seen block count */
1037 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1038 struct buffer_head * s_sbh; /* Buffer containing the super block */
1039 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1040 struct buffer_head **s_group_desc;
7f4520cc 1041 unsigned int s_mount_opt;
bc0b0d6d 1042 unsigned int s_mount_flags;
ca0faba0
TT		 1043 ext4_fsblk_t s_sb_block;
1044 uid_t s_resuid;
1045 gid_t s_resgid;
1046 unsigned short s_mount_state;
1047 unsigned short s_pad;
1048 int s_addr_per_block_bits;
1049 int s_desc_per_block_bits;
1050 int s_inode_size;
1051 int s_first_ino;
1052 unsigned int s_inode_readahead_blks;
11013911 1053 unsigned int s_inode_goal;
ca0faba0
TT		 1054 spinlock_t s_next_gen_lock;
1055 u32 s_next_generation;
1056 u32 s_hash_seed[4];
1057 int s_def_hash_version;
1058 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1059 struct percpu_counter s_freeblocks_counter;
1060 struct percpu_counter s_freeinodes_counter;
1061 struct percpu_counter s_dirs_counter;
1062 struct percpu_counter s_dirtyblocks_counter;
1063 struct blockgroup_lock *s_blockgroup_lock;
1064 struct proc_dir_entry *s_proc;
1065 struct kobject s_kobj;
1066 struct completion s_kobj_unregister;
1067
1068 /* Journaling */
1069 struct inode *s_journal_inode;
1070 struct journal_s *s_journal;
1071 struct list_head s_orphan;
1072 struct mutex s_orphan_lock;
1073 struct mutex s_resize_lock;
1074 unsigned long s_commit_interval;
1075 u32 s_max_batch_time;
1076 u32 s_min_batch_time;
1077 struct block_device *journal_bdev;
1078#ifdef CONFIG_JBD2_DEBUG
1079 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
1080 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
1081#endif
1082#ifdef CONFIG_QUOTA
1083 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1084 int s_jquota_fmt; /* Format of quota to use */
1085#endif
1086 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
6fd058f7 1087 struct rb_root system_blks;
ca0faba0
TT		 1088
1089#ifdef EXTENTS_STATS
1090 /* ext4 extents stats */
1091 unsigned long s_ext_min;
1092 unsigned long s_ext_max;
1093 unsigned long s_depth_max;
1094 spinlock_t s_ext_stats_lock;
1095 unsigned long s_ext_blocks;
1096 unsigned long s_ext_extents;
1097#endif
1098
1099 /* for buddy allocator */
1100 struct ext4_group_info ***s_group_info;
1101 struct inode *s_buddy_cache;
1102 long s_blocks_reserved;
1103 spinlock_t s_reserve_lock;
1104 spinlock_t s_md_lock;
1105 tid_t s_last_transaction;
1106 unsigned short *s_mb_offsets;
1107 unsigned int *s_mb_maxs;
1108
1109 /* tunables */
1110 unsigned long s_stripe;
1111 unsigned int s_mb_stream_request;
1112 unsigned int s_mb_max_to_scan;
1113 unsigned int s_mb_min_to_scan;
1114 unsigned int s_mb_stats;
1115 unsigned int s_mb_order2_reqs;
1116 unsigned int s_mb_group_prealloc;
55138e0b 1117 unsigned int s_max_writeback_mb_bump;
ca0faba0
TT		 1118 /* where last allocation was done - for stream allocation */
1119 unsigned long s_mb_last_group;
1120 unsigned long s_mb_last_start;
1121
ca0faba0
TT		 1122 /* stats for buddy allocator */
1123 spinlock_t s_mb_pa_lock;
1124 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1125 atomic_t s_bal_success; /* we found long enough chunks */
1126 atomic_t s_bal_allocated; /* in blocks */
1127 atomic_t s_bal_ex_scanned; /* total extents scanned */
1128 atomic_t s_bal_goals; /* goal hits */
1129 atomic_t s_bal_breaks; /* too long searches */
1130 atomic_t s_bal_2orders; /* 2^order hits */
1131 spinlock_t s_bal_lock;
1132 unsigned long s_mb_buddies_generated;
1133 unsigned long long s_mb_generation_time;
1134 atomic_t s_mb_lost_chunks;
1135 atomic_t s_mb_preallocated;
1136 atomic_t s_mb_discarded;
50797481 1137 atomic_t s_lock_busy;
ca0faba0
TT		 1138
1139 /* locality groups */
003cb608 1140 struct ext4_locality_group __percpu *s_locality_groups;
ca0faba0
TT		 1141
1142 /* for write statistics */
1143 unsigned long s_sectors_written_start;
1144 u64 s_kbytes_written;
1145
1146 unsigned int s_log_groups_per_flex;
1147 struct flex_groups *s_flex_groups;
4c0425ff
MC		 1148
1149 /* workqueue for dio unwritten */
1150 struct workqueue_struct *dio_unwritten_wq;
ca0faba0
TT		 1151};
1152
af5bc92d 1153static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
ac27a0ec
DK		 1154{
1155 return sb->s_fs_info;
1156}
617ba13b 1157static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
ac27a0ec 1158{
617ba13b 1159 return container_of(inode, struct ext4_inode_info, vfs_inode);
ac27a0ec
DK		 1160}
1161
ef7f3835
KS		 1162static inline struct timespec ext4_current_time(struct inode *inode)
1163{
1164 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1165 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1166}
1167
617ba13b 1168static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
ac27a0ec 1169{
617ba13b
MC		 1170 return ino == EXT4_ROOT_INO ||
1171 ino == EXT4_JOURNAL_INO ||
1172 ino == EXT4_RESIZE_INO ||
1173 (ino >= EXT4_FIRST_INO(sb) &&
1174 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
ac27a0ec 1175}
19f5fb7a
TT		 1176
1177/*
1178 * Inode dynamic state flags
1179 */
1180enum {
1181 EXT4_STATE_JDATA, /* journaled data exists */
1182 EXT4_STATE_NEW, /* inode is newly created */
1183 EXT4_STATE_XATTR, /* has in-inode xattrs */
1184 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1185 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1186 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1187 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
14ece102 1188 EXT4_STATE_NEWENTRY, /* File just added to dir */
19f5fb7a
TT		 1189};
1190
12e9b892
DM		 1191#define EXT4_INODE_BIT_FNS(name, field) \
1192static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1193{ \
1194 return test_bit(bit, &EXT4_I(inode)->i_##field); \
1195} \
1196static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1197{ \
1198 set_bit(bit, &EXT4_I(inode)->i_##field); \
1199} \
1200static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1201{ \
1202 clear_bit(bit, &EXT4_I(inode)->i_##field); \
19f5fb7a
TT		 1203}
1204
12e9b892
DM		 1205EXT4_INODE_BIT_FNS(flag, flags)
1206EXT4_INODE_BIT_FNS(state, state_flags)
ac27a0ec 1207#else
617ba13b 1208/* Assume that user mode programs are passing in an ext4fs superblock, not
ac27a0ec
DK		 1209 * a kernel struct super_block. This will allow us to call the feature-test
1210 * macros from user land. */
617ba13b 1211#define EXT4_SB(sb) (sb)
ac27a0ec
DK		 1212#endif
1213
617ba13b 1214#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
ac27a0ec
DK		 1215
1216/*
1217 * Codes for operating systems
1218 */
617ba13b
MC		 1219#define EXT4_OS_LINUX 0
1220#define EXT4_OS_HURD 1
1221#define EXT4_OS_MASIX 2
1222#define EXT4_OS_FREEBSD 3
1223#define EXT4_OS_LITES 4
ac27a0ec
DK		 1224
1225/*
1226 * Revision levels
1227 */
617ba13b
MC		 1228#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1229#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
ac27a0ec 1230
617ba13b
MC		 1231#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1232#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
ac27a0ec 1233
617ba13b 1234#define EXT4_GOOD_OLD_INODE_SIZE 128
ac27a0ec
DK		 1235
1236/*
1237 * Feature set definitions
1238 */
1239
617ba13b 1240#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
3a06d778 1241 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
617ba13b 1242#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
3a06d778 1243 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
617ba13b 1244#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
3a06d778 1245 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
617ba13b
MC		 1246#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1247 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1248#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1249 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1250#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1251 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1252#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1253 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1254#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1255 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1256#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1257 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1258
1259#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1260#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1261#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1262#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1263#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1264#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1265
1266#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1267#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1268#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
0fc1b451 1269#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
717d50e4 1270#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
f8628a14 1271#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
ef7f3835 1272#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
617ba13b
MC		 1273
1274#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1275#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1276#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1277#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1278#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
a86c6181 1279#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
bd81d8ee 1280#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
0fc1b451 1281#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
ce421581 1282#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
f710b4b9
TT		 1283#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1284#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
617ba13b
MC		 1285
1286#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1287#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1288 EXT4_FEATURE_INCOMPAT_RECOVER| \
a86c6181 1289 EXT4_FEATURE_INCOMPAT_META_BG| \
bd81d8ee 1290 EXT4_FEATURE_INCOMPAT_EXTENTS| \
ce421581
JS		 1291 EXT4_FEATURE_INCOMPAT_64BIT| \
1292 EXT4_FEATURE_INCOMPAT_FLEX_BG)
617ba13b
MC		 1293#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1294 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
717d50e4 1295 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
f8628a14 1296 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
ef7f3835 1297 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
0fc1b451
AK		 1298 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1299 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
ac27a0ec
DK		 1300
1301/*
1302 * Default values for user and/or group using reserved blocks
1303 */
617ba13b
MC		 1304#define EXT4_DEF_RESUID 0
1305#define EXT4_DEF_RESGID 0
ac27a0ec 1306
240799cd
TT		 1307#define EXT4_DEF_INODE_READAHEAD_BLKS 32
1308
ac27a0ec
DK		 1309/*
1310 * Default mount options
1311 */
617ba13b
MC		 1312#define EXT4_DEFM_DEBUG 0x0001
1313#define EXT4_DEFM_BSDGROUPS 0x0002
1314#define EXT4_DEFM_XATTR_USER 0x0004
1315#define EXT4_DEFM_ACL 0x0008
1316#define EXT4_DEFM_UID16 0x0010
1317#define EXT4_DEFM_JMODE 0x0060
1318#define EXT4_DEFM_JMODE_DATA 0x0020
1319#define EXT4_DEFM_JMODE_ORDERED 0x0040
1320#define EXT4_DEFM_JMODE_WBACK 0x0060
ac27a0ec 1321
30773840
TT		 1322/*
1323 * Default journal batch times
1324 */
1325#define EXT4_DEF_MIN_BATCH_TIME 0
1326#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1327
a4912123
TT		 1328/*
1329 * Minimum number of groups in a flexgroup before we separate out
1330 * directories into the first block group of a flexgroup
1331 */
1332#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1333
ac27a0ec
DK		 1334/*
1335 * Structure of a directory entry
1336 */
617ba13b 1337#define EXT4_NAME_LEN 255
ac27a0ec 1338
617ba13b 1339struct ext4_dir_entry {
ac27a0ec
DK		 1340 __le32 inode; /* Inode number */
1341 __le16 rec_len; /* Directory entry length */
1342 __le16 name_len; /* Name length */
617ba13b 1343 char name[EXT4_NAME_LEN]; /* File name */
ac27a0ec
DK		 1344};
1345
1346/*
617ba13b 1347 * The new version of the directory entry. Since EXT4 structures are
ac27a0ec
DK		 1348 * stored in intel byte order, and the name_len field could never be
1349 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1350 * file_type field.
1351 */
617ba13b 1352struct ext4_dir_entry_2 {
ac27a0ec
DK		 1353 __le32 inode; /* Inode number */
1354 __le16 rec_len; /* Directory entry length */
1355 __u8 name_len; /* Name length */
1356 __u8 file_type;
617ba13b 1357 char name[EXT4_NAME_LEN]; /* File name */
ac27a0ec
DK		 1358};
1359
1360/*
617ba13b 1361 * Ext4 directory file types. Only the low 3 bits are used. The
ac27a0ec
DK		 1362 * other bits are reserved for now.
1363 */
617ba13b
MC		 1364#define EXT4_FT_UNKNOWN 0
1365#define EXT4_FT_REG_FILE 1
1366#define EXT4_FT_DIR 2
1367#define EXT4_FT_CHRDEV 3
1368#define EXT4_FT_BLKDEV 4
1369#define EXT4_FT_FIFO 5
1370#define EXT4_FT_SOCK 6
1371#define EXT4_FT_SYMLINK 7
ac27a0ec 1372
617ba13b 1373#define EXT4_FT_MAX 8
ac27a0ec
DK		 1374
1375/*
617ba13b 1376 * EXT4_DIR_PAD defines the directory entries boundaries
ac27a0ec
DK		 1377 *
1378 * NOTE: It must be a multiple of 4
1379 */
617ba13b
MC		 1380#define EXT4_DIR_PAD 4
1381#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1382#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1383 ~EXT4_DIR_ROUND)
a72d7f83
JK		 1384#define EXT4_MAX_REC_LEN ((1<<16)-1)
1385
ac27a0ec
DK		 1386/*
1387 * Hash Tree Directory indexing
1388 * (c) Daniel Phillips, 2001
1389 */
1390
4074fe37
ES		 1391#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1392 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
12e9b892 1393 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
617ba13b
MC		 1394#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1395#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
ac27a0ec
DK		 1396
1397/* Legal values for the dx_root hash_version field: */
1398
1399#define DX_HASH_LEGACY 0
1400#define DX_HASH_HALF_MD4 1
1401#define DX_HASH_TEA 2
f99b2589
TT		 1402#define DX_HASH_LEGACY_UNSIGNED 3
1403#define DX_HASH_HALF_MD4_UNSIGNED 4
1404#define DX_HASH_TEA_UNSIGNED 5
ac27a0ec
DK		 1405
1406#ifdef __KERNEL__
1407
1408/* hash info structure used by the directory hash */
1409struct dx_hash_info
1410{
1411 u32 hash;
1412 u32 minor_hash;
1413 int hash_version;
1414 u32 *seed;
1415};
1416
617ba13b 1417#define EXT4_HTREE_EOF 0x7fffffff
ac27a0ec
DK		 1418
1419/*
617ba13b 1420 * Control parameters used by ext4_htree_next_block
ac27a0ec
DK		 1421 */
1422#define HASH_NB_ALWAYS 1
1423
1424
1425/*
1426 * Describe an inode's exact location on disk and in memory
1427 */
617ba13b 1428struct ext4_iloc
ac27a0ec
DK		 1429{
1430 struct buffer_head *bh;
1431 unsigned long offset;
fd2d4291 1432 ext4_group_t block_group;
ac27a0ec
DK		 1433};
1434
617ba13b 1435static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
ac27a0ec 1436{
617ba13b 1437 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
ac27a0ec
DK		 1438}
1439
1440/*
1441 * This structure is stuffed into the struct file's private_data field
1442 * for directories. It is where we put information so that we can do
1443 * readdir operations in hash tree order.
1444 */
1445struct dir_private_info {
1446 struct rb_root root;
1447 struct rb_node *curr_node;
1448 struct fname *extra_fname;
1449 loff_t last_pos;
1450 __u32 curr_hash;
1451 __u32 curr_minor_hash;
1452 __u32 next_hash;
1453};
1454
1455/* calculate the first block number of the group */
617ba13b 1456static inline ext4_fsblk_t
fd2d4291 1457ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
ac27a0ec 1458{
617ba13b
MC		 1459 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1460 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
ac27a0ec
DK		 1461}
1462
1463/*
1464 * Special error return code only used by dx_probe() and its callers.
1465 */
1466#define ERR_BAD_DX_DIR -75000
1467
72b64b59 1468void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
a9df9a49 1469 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
3a5b2ecd 1470
9f6200bb
TT		 1471extern struct proc_dir_entry *ext4_proc_root;
1472
ac27a0ec
DK		 1473/*
1474 * Function prototypes
1475 */
1476
1477/*
1478 * Ok, these declarations are also in <linux/kernel.h> but none of the
617ba13b 1479 * ext4 source programs needs to include it so they are duplicated here.
ac27a0ec 1480 */
8c55e204
DK		 1481# define NORET_TYPE /**/
1482# define ATTRIB_NORET __attribute__((noreturn))
1483# define NORET_AND noreturn,
ac27a0ec 1484
498e5f24
TT		 1485/* bitmap.c */
1486extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1487
ac27a0ec 1488/* balloc.c */
3a5b2ecd
MC		 1489extern unsigned int ext4_block_group(struct super_block *sb,
1490 ext4_fsblk_t blocknr);
1491extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1492 ext4_fsblk_t blocknr);
fd2d4291
AM		 1493extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1494extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1495 ext4_group_t group);
7061eba7 1496extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
617ba13b 1497 ext4_fsblk_t goal, unsigned long *count, int *errp);
5c791616 1498extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
8c3bf8a0 1499extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
e21675d4
AK		 1500extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1501 ext4_fsblk_t block, unsigned long count);
af5bc92d
TT		 1502extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1503extern void ext4_check_blocks_bitmap(struct super_block *);
617ba13b 1504extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
fd2d4291 1505 ext4_group_t block_group,
ac27a0ec 1506 struct buffer_head ** bh);
617ba13b 1507extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
bb23c20a
TT		 1508struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1509 ext4_group_t block_group);
1510extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1511 struct buffer_head *bh,
1512 ext4_group_t group,
1513 struct ext4_group_desc *desc);
1514#define ext4_free_blocks_after_init(sb, group, desc) \
1515 ext4_init_block_bitmap(sb, NULL, group, desc)
ac27a0ec
DK		 1516
1517/* dir.c */
617ba13b
MC		 1518extern int ext4_check_dir_entry(const char *, struct inode *,
1519 struct ext4_dir_entry_2 *,
498e5f24 1520 struct buffer_head *, unsigned int);
617ba13b 1521extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
ac27a0ec 1522 __u32 minor_hash,
617ba13b
MC		 1523 struct ext4_dir_entry_2 *dirent);
1524extern void ext4_htree_free_dir_info(struct dir_private_info *p);
ac27a0ec
DK		 1525
1526/* fsync.c */
7ea80859 1527extern int ext4_sync_file(struct file *, int);
ac27a0ec
DK		 1528
1529/* hash.c */
617ba13b 1530extern int ext4fs_dirhash(const char *name, int len, struct
ac27a0ec
DK		 1531 dx_hash_info *hinfo);
1532
1533/* ialloc.c */
f157a4aa 1534extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
11013911 1535 const struct qstr *qstr, __u32 goal);
af5bc92d
TT		 1536extern void ext4_free_inode(handle_t *, struct inode *);
1537extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1538extern unsigned long ext4_count_free_inodes(struct super_block *);
1539extern unsigned long ext4_count_dirs(struct super_block *);
1540extern void ext4_check_inodes_bitmap(struct super_block *);
bb23c20a
TT		 1541extern unsigned ext4_init_inode_bitmap(struct super_block *sb,
1542 struct buffer_head *bh,
1543 ext4_group_t group,
1544 struct ext4_group_desc *desc);
1545extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
ac27a0ec 1546
c9de560d
AT		 1547/* mballoc.c */
1548extern long ext4_mb_stats;
1549extern long ext4_mb_max_to_scan;
1550extern int ext4_mb_init(struct super_block *, int);
1551extern int ext4_mb_release(struct super_block *);
1552extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1553 struct ext4_allocation_request *, int *);
1554extern int ext4_mb_reserve_blocks(struct super_block *, int);
c2ea3fde 1555extern void ext4_discard_preallocations(struct inode *);
c9de560d
AT		 1556extern int __init init_ext4_mballoc(void);
1557extern void exit_ext4_mballoc(void);
44338711 1558extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
e6362609
TT		 1559 struct buffer_head *bh, ext4_fsblk_t block,
1560 unsigned long count, int flags);
920313a7 1561extern int ext4_mb_add_groupinfo(struct super_block *sb,
5f21b0e6 1562 ext4_group_t i, struct ext4_group_desc *desc);
920313a7
AK		 1563extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1564extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1565 ext4_group_t, int);
ac27a0ec 1566/* inode.c */
725d26d3
AK		 1567struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1568 ext4_lblk_t, int, int *);
1569struct buffer_head *ext4_bread(handle_t *, struct inode *,
1570 ext4_lblk_t, int, int *);
6873fa0d
ES		 1571int ext4_get_block(struct inode *inode, sector_t iblock,
1572 struct buffer_head *bh_result, int create);
ac27a0ec 1573
1d1fe1ee 1574extern struct inode *ext4_iget(struct super_block *, unsigned long);
a9185b41 1575extern int ext4_write_inode(struct inode *, struct writeback_control *);
af5bc92d 1576extern int ext4_setattr(struct dentry *, struct iattr *);
3e3398a0
MC		 1577extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1578 struct kstat *stat);
af5bc92d
TT		 1579extern void ext4_delete_inode(struct inode *);
1580extern int ext4_sync_inode(handle_t *, struct inode *);
617ba13b
MC		 1581extern void ext4_dirty_inode(struct inode *);
1582extern int ext4_change_inode_journal_flag(struct inode *, int);
1583extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
91ef4caf 1584extern int ext4_can_truncate(struct inode *inode);
af5bc92d 1585extern void ext4_truncate(struct inode *);
487caeef 1586extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
617ba13b 1587extern void ext4_set_inode_flags(struct inode *);
ff9ddf7e 1588extern void ext4_get_inode_flags(struct ext4_inode_info *);
ccd2506b 1589extern int ext4_alloc_da_blocks(struct inode *inode);
617ba13b 1590extern void ext4_set_aops(struct inode *inode);
a86c6181 1591extern int ext4_writepage_trans_blocks(struct inode *);
a02908f1 1592extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
f3bd1f3f 1593extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
cf108bca 1594extern int ext4_block_truncate_page(handle_t *handle,
a86c6181 1595 struct address_space *mapping, loff_t from);
c2ec175c 1596extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
a9e7f447 1597extern qsize_t *ext4_get_reserved_space(struct inode *inode);
c7064ef1 1598extern int flush_completed_IO(struct inode *inode);
5f634d06
AK		 1599extern void ext4_da_update_reserve_space(struct inode *inode,
1600 int used, int quota_claim);
ac27a0ec 1601/* ioctl.c */
5cdd7b2d 1602extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
af5bc92d 1603extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
ac27a0ec 1604
c14c6fd5 1605/* migrate.c */
2a43a878 1606extern int ext4_ext_migrate(struct inode *);
3d0518f4 1607
ac27a0ec 1608/* namei.c */
3d0518f4
WY		 1609extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize);
1610extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize);
617ba13b
MC		 1611extern int ext4_orphan_add(handle_t *, struct inode *);
1612extern int ext4_orphan_del(handle_t *, struct inode *);
1613extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
ac27a0ec
DK		 1614 __u32 start_minor_hash, __u32 *next_hash);
1615
1616/* resize.c */
617ba13b
MC		 1617extern int ext4_group_add(struct super_block *sb,
1618 struct ext4_new_group_data *input);
1619extern int ext4_group_extend(struct super_block *sb,
1620 struct ext4_super_block *es,
1621 ext4_fsblk_t n_blocks_count);
ac27a0ec
DK		 1622
1623/* super.c */
12062ddd 1624extern void __ext4_error(struct super_block *, const char *, const char *, ...)
ac27a0ec 1625 __attribute__ ((format (printf, 3, 4)));
12062ddd 1626#define ext4_error(sb, message...) __ext4_error(sb, __func__, ## message)
273df556
FM		 1627extern void ext4_error_inode(const char *, struct inode *, const char *, ...)
1628 __attribute__ ((format (printf, 3, 4)));
1629extern void ext4_error_file(const char *, struct file *, const char *, ...)
ac27a0ec 1630 __attribute__ ((format (printf, 3, 4)));
af5bc92d 1631extern void __ext4_std_error(struct super_block *, const char *, int);
c67d859e 1632extern void __ext4_abort(struct super_block *, const char *, const char *, ...)
ac27a0ec 1633 __attribute__ ((format (printf, 3, 4)));
c67d859e
TT		 1634#define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
1635 ## message)
12062ddd
ES		 1636extern void __ext4_warning(struct super_block *, const char *,
1637 const char *, ...)
ac27a0ec 1638 __attribute__ ((format (printf, 3, 4)));
12062ddd 1639#define ext4_warning(sb, message...) __ext4_warning(sb, __func__, ## message)
b31e1552
ES		 1640extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1641 __attribute__ ((format (printf, 3, 4)));
e29136f8
TT		 1642extern void __ext4_grp_locked_error(const char *, unsigned int, \
1643 struct super_block *, ext4_group_t, \
1644 unsigned long, ext4_fsblk_t, \
1645 const char *, ...)
1646 __attribute__ ((format (printf, 7, 8)));
1647#define ext4_grp_locked_error(sb, grp, message...) \
1648 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
af5bc92d 1649extern void ext4_update_dynamic_rev(struct super_block *sb);
99e6f829
AK		 1650extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1651 __u32 compat);
1652extern int ext4_update_rocompat_feature(handle_t *handle,
1653 struct super_block *sb, __u32 rocompat);
1654extern int ext4_update_incompat_feature(handle_t *handle,
1655 struct super_block *sb, __u32 incompat);
8fadc143
AR		 1656extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1657 struct ext4_group_desc *bg);
1658extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1659 struct ext4_group_desc *bg);
1660extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1661 struct ext4_group_desc *bg);
560671a0
AK		 1662extern __u32 ext4_free_blks_count(struct super_block *sb,
1663 struct ext4_group_desc *bg);
1664extern __u32 ext4_free_inodes_count(struct super_block *sb,
1665 struct ext4_group_desc *bg);
1666extern __u32 ext4_used_dirs_count(struct super_block *sb,
1667 struct ext4_group_desc *bg);
1668extern __u32 ext4_itable_unused_count(struct super_block *sb,
1669 struct ext4_group_desc *bg);
8fadc143
AR		 1670extern void ext4_block_bitmap_set(struct super_block *sb,
1671 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1672extern void ext4_inode_bitmap_set(struct super_block *sb,
1673 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1674extern void ext4_inode_table_set(struct super_block *sb,
1675 struct ext4_group_desc *bg, ext4_fsblk_t blk);
560671a0
AK		 1676extern void ext4_free_blks_set(struct super_block *sb,
1677 struct ext4_group_desc *bg, __u32 count);
1678extern void ext4_free_inodes_set(struct super_block *sb,
1679 struct ext4_group_desc *bg, __u32 count);
1680extern void ext4_used_dirs_set(struct super_block *sb,
1681 struct ext4_group_desc *bg, __u32 count);
1682extern void ext4_itable_unused_set(struct super_block *sb,
1683 struct ext4_group_desc *bg, __u32 count);
bb23c20a
TT		 1684extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1685 struct ext4_group_desc *gdp);
1686extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1687 struct ext4_group_desc *gdp);
bd81d8ee
LV		 1688
1689static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1690{
1691 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
6bc9feff 1692 le32_to_cpu(es->s_blocks_count_lo);
bd81d8ee
LV		 1693}
1694
1695static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1696{
1697 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
308ba3ec 1698 le32_to_cpu(es->s_r_blocks_count_lo);
bd81d8ee
LV		 1699}
1700
1701static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1702{
1703 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
308ba3ec 1704 le32_to_cpu(es->s_free_blocks_count_lo);
bd81d8ee
LV		 1705}
1706
1707static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1708 ext4_fsblk_t blk)
1709{
6bc9feff 1710 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
bd81d8ee
LV		 1711 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1712}
1713
1714static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1715 ext4_fsblk_t blk)
1716{
308ba3ec 1717 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
bd81d8ee
LV		 1718 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1719}
1720
1721static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1722 ext4_fsblk_t blk)
1723{
308ba3ec 1724 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
bd81d8ee
LV		 1725 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1726}
1727
a48380f7
AK		 1728static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1729{
06a279d6
TT		 1730 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1731 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1732 le32_to_cpu(raw_inode->i_size_lo);
1733 else
1734 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
a48380f7 1735}
bd81d8ee 1736
a48380f7
AK		 1737static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1738{
1739 raw_inode->i_size_lo = cpu_to_le32(i_size);
1740 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1741}
ac27a0ec 1742
c9de560d
AT		 1743static inline
1744struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
af5bc92d 1745 ext4_group_t group)
c9de560d
AT		 1746{
1747 struct ext4_group_info ***grp_info;
1748 long indexv, indexh;
1749 grp_info = EXT4_SB(sb)->s_group_info;
1750 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1751 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1752 return grp_info[indexv][indexh];
1753}
1754
8df9675f
TT		 1755/*
1756 * Reading s_groups_count requires using smp_rmb() afterwards. See
1757 * the locking protocol documented in the comments of ext4_group_add()
1758 * in resize.c
1759 */
1760static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
1761{
1762 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
1763
1764 smp_rmb();
1765 return ngroups;
1766}
c9de560d 1767
772cb7c8
JS		 1768static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1769 ext4_group_t block_group)
1770{
1771 return block_group >> sbi->s_log_groups_per_flex;
1772}
1773
1774static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1775{
1776 return 1 << sbi->s_log_groups_per_flex;
1777}
1778
617ba13b 1779#define ext4_std_error(sb, errno) \
ac27a0ec
DK		 1780do { \
1781 if ((errno)) \
4db9c54a 1782 __ext4_std_error((sb), __func__, (errno)); \
ac27a0ec
DK		 1783} while (0)
1784
a30d542a 1785#ifdef CONFIG_SMP
179f7ebf 1786/* Each CPU can accumulate percpu_counter_batch blocks in their local
a30d542a 1787 * counters. So we need to make sure we have free blocks more
179f7ebf 1788 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
a30d542a 1789 */
179f7ebf 1790#define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
a30d542a
AK		 1791#else
1792#define EXT4_FREEBLOCKS_WATERMARK 0
1793#endif
1794
cf17fea6
AK		 1795static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1796{
1797 /*
1798 * XXX: replace with spinlock if seen contended -bzzz
1799 */
1800 down_write(&EXT4_I(inode)->i_data_sem);
1801 if (newsize > EXT4_I(inode)->i_disksize)
1802 EXT4_I(inode)->i_disksize = newsize;
1803 up_write(&EXT4_I(inode)->i_data_sem);
1804 return ;
1805}
a30d542a 1806
5d1b1b3f
AK		 1807struct ext4_group_info {
1808 unsigned long bb_state;
1809 struct rb_root bb_free_root;
a36b4498
ES		 1810 ext4_grpblk_t bb_first_free; /* first free block */
1811 ext4_grpblk_t bb_free; /* total free blocks */
1812 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
8a57d9d6 1813 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
5d1b1b3f
AK		 1814 struct list_head bb_prealloc_list;
1815#ifdef DOUBLE_CHECK
1816 void *bb_bitmap;
1817#endif
1818 struct rw_semaphore alloc_sem;
a36b4498
ES		 1819 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
1820 * regions, index is order.
1821 * bb_counters[3] = 5 means
1822 * 5 free 8-block regions. */
5d1b1b3f
AK		 1823};
1824
1825#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
5d1b1b3f
AK		 1826
1827#define EXT4_MB_GRP_NEED_INIT(grp) \
1828 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1829
50797481
TT		 1830#define EXT4_MAX_CONTENTION 8
1831#define EXT4_CONTENTION_THRESHOLD 2
1832
955ce5f5
AK		 1833static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
1834 ext4_group_t group)
5d1b1b3f 1835{
955ce5f5
AK		 1836 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
1837}
5d1b1b3f 1838
50797481
TT		 1839/*
1840 * Returns true if the filesystem is busy enough that attempts to
1841 * access the block group locks has run into contention.
1842 */
1843static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
1844{
1845 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
1846}
1847
955ce5f5
AK		 1848static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1849{
50797481
TT		 1850 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
1851 if (spin_trylock(lock))
1852 /*
1853 * We're able to grab the lock right away, so drop the
1854 * lock contention counter.
1855 */
1856 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
1857 else {
1858 /*
1859 * The lock is busy, so bump the contention counter,
1860 * and then wait on the spin lock.
1861 */
1862 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
1863 EXT4_MAX_CONTENTION);
1864 spin_lock(lock);
1865 }
5d1b1b3f
AK		 1866}
1867
1868static inline void ext4_unlock_group(struct super_block *sb,
1869 ext4_group_t group)
1870{
955ce5f5 1871 spin_unlock(ext4_group_lock_ptr(sb, group));
5d1b1b3f
AK		 1872}
1873
a0375156
TT		 1874static inline void ext4_mark_super_dirty(struct super_block *sb)
1875{
1876 if (EXT4_SB(sb)->s_journal == NULL)
1877 sb->s_dirt =1;
1878}
1879
ac27a0ec
DK		 1880/*
1881 * Inodes and files operations
1882 */
1883
1884/* dir.c */
617ba13b 1885extern const struct file_operations ext4_dir_operations;
ac27a0ec
DK		 1886
1887/* file.c */
c5ef1c42 1888extern const struct inode_operations ext4_file_inode_operations;
617ba13b 1889extern const struct file_operations ext4_file_operations;
ac27a0ec
DK		 1890
1891/* namei.c */
c5ef1c42
AV		 1892extern const struct inode_operations ext4_dir_inode_operations;
1893extern const struct inode_operations ext4_special_inode_operations;
596397b7 1894extern struct dentry *ext4_get_parent(struct dentry *child);
ac27a0ec
DK		 1895
1896/* symlink.c */
c5ef1c42
AV		 1897extern const struct inode_operations ext4_symlink_inode_operations;
1898extern const struct inode_operations ext4_fast_symlink_inode_operations;
ac27a0ec 1899
6fd058f7
TT		 1900/* block_validity */
1901extern void ext4_release_system_zone(struct super_block *sb);
1902extern int ext4_setup_system_zone(struct super_block *sb);
1903extern int __init init_ext4_system_zone(void);
1904extern void exit_ext4_system_zone(void);
1905extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
1906 ext4_fsblk_t start_blk,
1907 unsigned int count);
1908
a86c6181
AT		 1909/* extents.c */
1910extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1911extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
a02908f1
MC		 1912extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1913 int chunk);
e35fd660
TT		 1914extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
1915 struct ext4_map_blocks *map, int flags);
cf108bca 1916extern void ext4_ext_truncate(struct inode *);
a86c6181
AT		 1917extern void ext4_ext_init(struct super_block *);
1918extern void ext4_ext_release(struct super_block *);
a2df2a63
AA		 1919extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1920 loff_t len);
0031462b 1921extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
a1de02dc 1922 ssize_t len);
e35fd660
TT		 1923extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
1924 struct ext4_map_blocks *map, int flags);
12b7ac17
TT		 1925extern int ext4_get_blocks(handle_t *handle, struct inode *inode,
1926 sector_t block, unsigned int max_blocks,
c2177057 1927 struct buffer_head *bh, int flags);
3a06d778
AK		 1928extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1929 __u64 start, __u64 len);
748de673
AF		 1930/* move_extent.c */
1931extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
1932 __u64 start_orig, __u64 start_donor,
1933 __u64 len, __u64 *moved_len);
1934
3a06d778 1935
744692dc
JZ		 1936/* BH_Uninit flag: blocks are allocated but uninitialized on disk */
1937enum ext4_state_bits {
1938 BH_Uninit /* blocks are allocated but uninitialized on disk */
1939 = BH_JBDPrivateStart,
1940};
1941
1942BUFFER_FNS(Uninit, uninit)
1943TAS_BUFFER_FNS(Uninit, uninit)
1944
2ccb5fb9
AK		 1945/*
1946 * Add new method to test wether block and inode bitmaps are properly
1947 * initialized. With uninit_bg reading the block from disk is not enough
1948 * to mark the bitmap uptodate. We need to also zero-out the bitmap
1949 */
1950#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1951
1952static inline int bitmap_uptodate(struct buffer_head *bh)
1953{
1954 return (buffer_uptodate(bh) &&
1955 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1956}
1957static inline void set_bitmap_uptodate(struct buffer_head *bh)
1958{
1959 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1960}
1961
731eb1a0
AM		 1962#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
1963
ac27a0ec
DK		 1964#endif /* __KERNEL__ */
1965
3dcf5451 1966#endif /* _EXT4_H */
Linux kernel - Deliverables
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