Commit | Line | Data |
---|---|---|
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> | |
c9de560d | 32 | |
ac27a0ec | 33 | /* |
8a35694e | 34 | * The fourth extended filesystem constants/structures |
ac27a0ec DK |
35 | */ |
36 | ||
37 | /* | |
617ba13b | 38 | * Define EXT4FS_DEBUG to produce debug messages |
ac27a0ec | 39 | */ |
617ba13b | 40 | #undef EXT4FS_DEBUG |
ac27a0ec | 41 | |
ac27a0ec DK |
42 | /* |
43 | * Debug code | |
44 | */ | |
617ba13b MC |
45 | #ifdef EXT4FS_DEBUG |
46 | #define ext4_debug(f, a...) \ | |
ac27a0ec | 47 | do { \ |
af5bc92d | 48 | printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ |
4db9c54a | 49 | __FILE__, __LINE__, __func__); \ |
af5bc92d | 50 | printk(KERN_DEBUG f, ## a); \ |
ac27a0ec DK |
51 | } while (0) |
52 | #else | |
617ba13b | 53 | #define ext4_debug(f, a...) do {} while (0) |
ac27a0ec DK |
54 | #endif |
55 | ||
d444c3c3 TT |
56 | /* data type for block offset of block group */ |
57 | typedef int ext4_grpblk_t; | |
58 | ||
59 | /* data type for filesystem-wide blocks number */ | |
60 | typedef unsigned long long ext4_fsblk_t; | |
61 | ||
62 | /* data type for file logical block number */ | |
63 | typedef __u32 ext4_lblk_t; | |
64 | ||
65 | /* data type for block group number */ | |
66 | typedef unsigned int ext4_group_t; | |
67 | ||
68 | ||
c9de560d AT |
69 | /* prefer goal again. length */ |
70 | #define EXT4_MB_HINT_MERGE 1 | |
71 | /* blocks already reserved */ | |
72 | #define EXT4_MB_HINT_RESERVED 2 | |
73 | /* metadata is being allocated */ | |
74 | #define EXT4_MB_HINT_METADATA 4 | |
75 | /* first blocks in the file */ | |
76 | #define EXT4_MB_HINT_FIRST 8 | |
77 | /* search for the best chunk */ | |
78 | #define EXT4_MB_HINT_BEST 16 | |
79 | /* data is being allocated */ | |
80 | #define EXT4_MB_HINT_DATA 32 | |
81 | /* don't preallocate (for tails) */ | |
82 | #define EXT4_MB_HINT_NOPREALLOC 64 | |
83 | /* allocate for locality group */ | |
84 | #define EXT4_MB_HINT_GROUP_ALLOC 128 | |
85 | /* allocate goal blocks or none */ | |
86 | #define EXT4_MB_HINT_GOAL_ONLY 256 | |
87 | /* goal is meaningful */ | |
88 | #define EXT4_MB_HINT_TRY_GOAL 512 | |
d2a17637 MC |
89 | /* blocks already pre-reserved by delayed allocation */ |
90 | #define EXT4_MB_DELALLOC_RESERVED 1024 | |
91 | ||
c9de560d AT |
92 | |
93 | struct ext4_allocation_request { | |
94 | /* target inode for block we're allocating */ | |
95 | struct inode *inode; | |
726447d8 ES |
96 | /* how many blocks we want to allocate */ |
97 | unsigned int len; | |
c9de560d AT |
98 | /* logical block in target inode */ |
99 | ext4_lblk_t logical; | |
c9de560d AT |
100 | /* the closest logical allocated block to the left */ |
101 | ext4_lblk_t lleft; | |
c9de560d AT |
102 | /* the closest logical allocated block to the right */ |
103 | ext4_lblk_t lright; | |
726447d8 ES |
104 | /* phys. target (a hint) */ |
105 | ext4_fsblk_t goal; | |
106 | /* phys. block for the closest logical allocated block to the left */ | |
107 | ext4_fsblk_t pleft; | |
108 | /* phys. block for the closest logical allocated block to the right */ | |
c9de560d | 109 | ext4_fsblk_t pright; |
c9de560d | 110 | /* flags. see above EXT4_MB_HINT_* */ |
498e5f24 | 111 | unsigned int flags; |
c9de560d AT |
112 | }; |
113 | ||
ac27a0ec DK |
114 | /* |
115 | * Special inodes numbers | |
116 | */ | |
617ba13b MC |
117 | #define EXT4_BAD_INO 1 /* Bad blocks inode */ |
118 | #define EXT4_ROOT_INO 2 /* Root inode */ | |
119 | #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ | |
120 | #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ | |
121 | #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ | |
122 | #define EXT4_JOURNAL_INO 8 /* Journal inode */ | |
ac27a0ec | 123 | |
617ba13b MC |
124 | /* First non-reserved inode for old ext4 filesystems */ |
125 | #define EXT4_GOOD_OLD_FIRST_INO 11 | |
ac27a0ec DK |
126 | |
127 | /* | |
128 | * Maximal count of links to a file | |
129 | */ | |
f8628a14 | 130 | #define EXT4_LINK_MAX 65000 |
ac27a0ec DK |
131 | |
132 | /* | |
133 | * Macro-instructions used to manage several block sizes | |
134 | */ | |
617ba13b | 135 | #define EXT4_MIN_BLOCK_SIZE 1024 |
afc7cbca TS |
136 | #define EXT4_MAX_BLOCK_SIZE 65536 |
137 | #define EXT4_MIN_BLOCK_LOG_SIZE 10 | |
ac27a0ec | 138 | #ifdef __KERNEL__ |
617ba13b | 139 | # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) |
ac27a0ec | 140 | #else |
617ba13b | 141 | # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) |
ac27a0ec | 142 | #endif |
af5bc92d | 143 | #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) |
ac27a0ec | 144 | #ifdef __KERNEL__ |
617ba13b | 145 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) |
ac27a0ec | 146 | #else |
617ba13b | 147 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) |
ac27a0ec DK |
148 | #endif |
149 | #ifdef __KERNEL__ | |
617ba13b MC |
150 | #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) |
151 | #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) | |
152 | #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) | |
ac27a0ec | 153 | #else |
617ba13b MC |
154 | #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
155 | EXT4_GOOD_OLD_INODE_SIZE : \ | |
ac27a0ec | 156 | (s)->s_inode_size) |
617ba13b MC |
157 | #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
158 | EXT4_GOOD_OLD_FIRST_INO : \ | |
ac27a0ec DK |
159 | (s)->s_first_ino) |
160 | #endif | |
a2df2a63 | 161 | #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) |
ac27a0ec | 162 | |
ac27a0ec DK |
163 | /* |
164 | * Structure of a blocks group descriptor | |
165 | */ | |
617ba13b | 166 | struct ext4_group_desc |
ac27a0ec | 167 | { |
3a14589c | 168 | __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ |
5272f837 AK |
169 | __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ |
170 | __le32 bg_inode_table_lo; /* Inodes table block */ | |
560671a0 AK |
171 | __le16 bg_free_blocks_count_lo;/* Free blocks count */ |
172 | __le16 bg_free_inodes_count_lo;/* Free inodes count */ | |
173 | __le16 bg_used_dirs_count_lo; /* Directories count */ | |
717d50e4 AD |
174 | __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ |
175 | __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ | |
560671a0 | 176 | __le16 bg_itable_unused_lo; /* Unused inodes count */ |
717d50e4 | 177 | __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ |
8fadc143 AR |
178 | __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ |
179 | __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ | |
180 | __le32 bg_inode_table_hi; /* Inodes table block MSB */ | |
91b51a01 CL |
181 | __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ |
182 | __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ | |
183 | __le16 bg_used_dirs_count_hi; /* Directories count MSB */ | |
560671a0 | 184 | __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ |
91b51a01 | 185 | __u32 bg_reserved2[3]; |
ac27a0ec DK |
186 | }; |
187 | ||
772cb7c8 JS |
188 | /* |
189 | * Structure of a flex block group info | |
190 | */ | |
191 | ||
192 | struct flex_groups { | |
9f24e420 TT |
193 | atomic_t free_inodes; |
194 | atomic_t free_blocks; | |
7d39db14 | 195 | atomic_t used_dirs; |
772cb7c8 JS |
196 | }; |
197 | ||
717d50e4 AD |
198 | #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ |
199 | #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ | |
200 | #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ | |
201 | ||
ac27a0ec DK |
202 | /* |
203 | * Macro-instructions used to manage group descriptors | |
204 | */ | |
0d1ee42f | 205 | #define EXT4_MIN_DESC_SIZE 32 |
8fadc143 | 206 | #define EXT4_MIN_DESC_SIZE_64BIT 64 |
0d1ee42f AR |
207 | #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE |
208 | #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) | |
ac27a0ec | 209 | #ifdef __KERNEL__ |
617ba13b MC |
210 | # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) |
211 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) | |
212 | # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) | |
213 | # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) | |
ac27a0ec | 214 | #else |
617ba13b | 215 | # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) |
0d1ee42f | 216 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) |
617ba13b | 217 | # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) |
ac27a0ec DK |
218 | #endif |
219 | ||
220 | /* | |
221 | * Constants relative to the data blocks | |
222 | */ | |
617ba13b MC |
223 | #define EXT4_NDIR_BLOCKS 12 |
224 | #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS | |
225 | #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) | |
226 | #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) | |
227 | #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) | |
ac27a0ec DK |
228 | |
229 | /* | |
230 | * Inode flags | |
231 | */ | |
617ba13b MC |
232 | #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ |
233 | #define EXT4_UNRM_FL 0x00000002 /* Undelete */ | |
234 | #define EXT4_COMPR_FL 0x00000004 /* Compress file */ | |
235 | #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ | |
236 | #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ | |
237 | #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ | |
238 | #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ | |
239 | #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ | |
ac27a0ec | 240 | /* Reserved for compression usage... */ |
617ba13b MC |
241 | #define EXT4_DIRTY_FL 0x00000100 |
242 | #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ | |
243 | #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ | |
244 | #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ | |
ac27a0ec | 245 | /* End compression flags --- maybe not all used */ |
617ba13b MC |
246 | #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ |
247 | #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ | |
248 | #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ | |
249 | #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ | |
250 | #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ | |
251 | #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ | |
8180a562 | 252 | #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ |
a86c6181 | 253 | #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ |
267e4db9 | 254 | #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */ |
8180a562 | 255 | #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ |
ac27a0ec | 256 | |
a86c6181 | 257 | #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ |
4db46fc2 | 258 | #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */ |
ac27a0ec | 259 | |
8fa43a81 DG |
260 | /* Flags that should be inherited by new inodes from their parent. */ |
261 | #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ | |
262 | EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ | |
263 | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ | |
264 | EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ | |
265 | EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) | |
266 | ||
2dc6b0d4 DG |
267 | /* Flags that are appropriate for regular files (all but dir-specific ones). */ |
268 | #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) | |
269 | ||
270 | /* Flags that are appropriate for non-directories/regular files. */ | |
271 | #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) | |
272 | ||
273 | /* Mask out flags that are inappropriate for the given type of inode. */ | |
274 | static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) | |
275 | { | |
276 | if (S_ISDIR(mode)) | |
277 | return flags; | |
278 | else if (S_ISREG(mode)) | |
279 | return flags & EXT4_REG_FLMASK; | |
280 | else | |
281 | return flags & EXT4_OTHER_FLMASK; | |
282 | } | |
283 | ||
ac27a0ec DK |
284 | /* |
285 | * Inode dynamic state flags | |
286 | */ | |
617ba13b MC |
287 | #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */ |
288 | #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */ | |
289 | #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */ | |
6dd4ee7c | 290 | #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ |
7d8f9f7d | 291 | #define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */ |
ac27a0ec DK |
292 | |
293 | /* Used to pass group descriptor data when online resize is done */ | |
617ba13b | 294 | struct ext4_new_group_input { |
8c55e204 DK |
295 | __u32 group; /* Group number for this data */ |
296 | __u64 block_bitmap; /* Absolute block number of block bitmap */ | |
297 | __u64 inode_bitmap; /* Absolute block number of inode bitmap */ | |
298 | __u64 inode_table; /* Absolute block number of inode table start */ | |
299 | __u32 blocks_count; /* Total number of blocks in this group */ | |
300 | __u16 reserved_blocks; /* Number of reserved blocks in this group */ | |
ac27a0ec DK |
301 | __u16 unused; |
302 | }; | |
303 | ||
617ba13b MC |
304 | /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ |
305 | struct ext4_new_group_data { | |
ac27a0ec | 306 | __u32 group; |
bd81d8ee LV |
307 | __u64 block_bitmap; |
308 | __u64 inode_bitmap; | |
309 | __u64 inode_table; | |
ac27a0ec DK |
310 | __u32 blocks_count; |
311 | __u16 reserved_blocks; | |
312 | __u16 unused; | |
313 | __u32 free_blocks_count; | |
314 | }; | |
315 | ||
a2df2a63 | 316 | /* |
c2177057 | 317 | * Flags used by ext4_get_blocks() |
a2df2a63 | 318 | */ |
c2177057 TT |
319 | /* Allocate any needed blocks and/or convert an unitialized |
320 | extent to be an initialized ext4 */ | |
2ac3b6e0 | 321 | #define EXT4_GET_BLOCKS_CREATE 0x0001 |
c2177057 | 322 | /* Request the creation of an unitialized extent */ |
2ac3b6e0 | 323 | #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 |
c2177057 TT |
324 | #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ |
325 | EXT4_GET_BLOCKS_CREATE) | |
c2177057 | 326 | /* Caller is from the delayed allocation writeout path, |
2ac3b6e0 TT |
327 | so set the magic i_delalloc_reserve_flag after taking the |
328 | inode allocation semaphore for */ | |
03f5d8bc | 329 | #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 |
2ac3b6e0 TT |
330 | /* Call ext4_da_update_reserve_space() after successfully |
331 | allocating the blocks */ | |
03f5d8bc | 332 | #define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE 0x0008 |
2ac3b6e0 | 333 | |
ac27a0ec DK |
334 | |
335 | /* | |
336 | * ioctl commands | |
337 | */ | |
617ba13b MC |
338 | #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS |
339 | #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS | |
340 | #define EXT4_IOC_GETVERSION _IOR('f', 3, long) | |
341 | #define EXT4_IOC_SETVERSION _IOW('f', 4, long) | |
617ba13b MC |
342 | #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION |
343 | #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION | |
e23291b9 | 344 | #ifdef CONFIG_JBD2_DEBUG |
617ba13b | 345 | #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) |
ac27a0ec | 346 | #endif |
617ba13b MC |
347 | #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) |
348 | #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) | |
8eea80d5 TT |
349 | #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) |
350 | #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) | |
351 | #define EXT4_IOC_MIGRATE _IO('f', 9) | |
ccd2506b | 352 | /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ |
8eea80d5 | 353 | /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ |
ccd2506b | 354 | #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) |
748de673 | 355 | #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) |
ac27a0ec DK |
356 | |
357 | /* | |
358 | * ioctl commands in 32 bit emulation | |
359 | */ | |
617ba13b MC |
360 | #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS |
361 | #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS | |
362 | #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) | |
363 | #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) | |
364 | #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) | |
365 | #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) | |
366 | #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) | |
e23291b9 | 367 | #ifdef CONFIG_JBD2_DEBUG |
617ba13b | 368 | #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) |
ac27a0ec | 369 | #endif |
617ba13b MC |
370 | #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION |
371 | #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION | |
ac27a0ec DK |
372 | |
373 | ||
374 | /* | |
375 | * Mount options | |
376 | */ | |
617ba13b | 377 | struct ext4_mount_options { |
ac27a0ec DK |
378 | unsigned long s_mount_opt; |
379 | uid_t s_resuid; | |
380 | gid_t s_resgid; | |
381 | unsigned long s_commit_interval; | |
30773840 | 382 | u32 s_min_batch_time, s_max_batch_time; |
ac27a0ec DK |
383 | #ifdef CONFIG_QUOTA |
384 | int s_jquota_fmt; | |
385 | char *s_qf_names[MAXQUOTAS]; | |
386 | #endif | |
387 | }; | |
388 | ||
389 | /* | |
390 | * Structure of an inode on the disk | |
391 | */ | |
617ba13b | 392 | struct ext4_inode { |
ac27a0ec DK |
393 | __le16 i_mode; /* File mode */ |
394 | __le16 i_uid; /* Low 16 bits of Owner Uid */ | |
a48380f7 | 395 | __le32 i_size_lo; /* Size in bytes */ |
ac27a0ec | 396 | __le32 i_atime; /* Access time */ |
ef7f3835 | 397 | __le32 i_ctime; /* Inode Change time */ |
ac27a0ec DK |
398 | __le32 i_mtime; /* Modification time */ |
399 | __le32 i_dtime; /* Deletion Time */ | |
400 | __le16 i_gid; /* Low 16 bits of Group Id */ | |
401 | __le16 i_links_count; /* Links count */ | |
0fc1b451 | 402 | __le32 i_blocks_lo; /* Blocks count */ |
ac27a0ec DK |
403 | __le32 i_flags; /* File flags */ |
404 | union { | |
405 | struct { | |
25ec56b5 | 406 | __le32 l_i_version; |
ac27a0ec DK |
407 | } linux1; |
408 | struct { | |
409 | __u32 h_i_translator; | |
410 | } hurd1; | |
411 | struct { | |
412 | __u32 m_i_reserved1; | |
413 | } masix1; | |
414 | } osd1; /* OS dependent 1 */ | |
617ba13b | 415 | __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ |
ac27a0ec | 416 | __le32 i_generation; /* File version (for NFS) */ |
7973c0c1 | 417 | __le32 i_file_acl_lo; /* File ACL */ |
a48380f7 | 418 | __le32 i_size_high; |
f077d0d7 | 419 | __le32 i_obso_faddr; /* Obsoleted fragment address */ |
ac27a0ec DK |
420 | union { |
421 | struct { | |
0fc1b451 | 422 | __le16 l_i_blocks_high; /* were l_i_reserved1 */ |
a1ddeb7e | 423 | __le16 l_i_file_acl_high; |
8c55e204 | 424 | __le16 l_i_uid_high; /* these 2 fields */ |
ac27a0ec DK |
425 | __le16 l_i_gid_high; /* were reserved2[0] */ |
426 | __u32 l_i_reserved2; | |
427 | } linux2; | |
428 | struct { | |
f077d0d7 | 429 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
ac27a0ec DK |
430 | __u16 h_i_mode_high; |
431 | __u16 h_i_uid_high; | |
432 | __u16 h_i_gid_high; | |
433 | __u32 h_i_author; | |
434 | } hurd2; | |
435 | struct { | |
f077d0d7 | 436 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
a1ddeb7e | 437 | __le16 m_i_file_acl_high; |
ac27a0ec DK |
438 | __u32 m_i_reserved2[2]; |
439 | } masix2; | |
440 | } osd2; /* OS dependent 2 */ | |
441 | __le16 i_extra_isize; | |
442 | __le16 i_pad1; | |
ef7f3835 KS |
443 | __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ |
444 | __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ | |
445 | __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ | |
446 | __le32 i_crtime; /* File Creation time */ | |
447 | __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ | |
25ec56b5 | 448 | __le32 i_version_hi; /* high 32 bits for 64-bit version */ |
ac27a0ec DK |
449 | }; |
450 | ||
748de673 AF |
451 | struct move_extent { |
452 | __u32 reserved; /* should be zero */ | |
453 | __u32 donor_fd; /* donor file descriptor */ | |
454 | __u64 orig_start; /* logical start offset in block for orig */ | |
455 | __u64 donor_start; /* logical start offset in block for donor */ | |
456 | __u64 len; /* block length to be moved */ | |
457 | __u64 moved_len; /* moved block length */ | |
458 | }; | |
459 | #define MAX_DEFRAG_SIZE ((1UL<<31) - 1) | |
ac27a0ec | 460 | |
ef7f3835 KS |
461 | #define EXT4_EPOCH_BITS 2 |
462 | #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) | |
463 | #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) | |
464 | ||
465 | /* | |
466 | * Extended fields will fit into an inode if the filesystem was formatted | |
467 | * with large inodes (-I 256 or larger) and there are not currently any EAs | |
468 | * consuming all of the available space. For new inodes we always reserve | |
469 | * enough space for the kernel's known extended fields, but for inodes | |
470 | * created with an old kernel this might not have been the case. None of | |
471 | * the extended inode fields is critical for correct filesystem operation. | |
472 | * This macro checks if a certain field fits in the inode. Note that | |
473 | * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize | |
474 | */ | |
475 | #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ | |
476 | ((offsetof(typeof(*ext4_inode), field) + \ | |
477 | sizeof((ext4_inode)->field)) \ | |
478 | <= (EXT4_GOOD_OLD_INODE_SIZE + \ | |
479 | (einode)->i_extra_isize)) \ | |
480 | ||
481 | static inline __le32 ext4_encode_extra_time(struct timespec *time) | |
482 | { | |
483 | return cpu_to_le32((sizeof(time->tv_sec) > 4 ? | |
484 | time->tv_sec >> 32 : 0) | | |
485 | ((time->tv_nsec << 2) & EXT4_NSEC_MASK)); | |
486 | } | |
487 | ||
488 | static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) | |
489 | { | |
490 | if (sizeof(time->tv_sec) > 4) | |
491 | time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) | |
492 | << 32; | |
493 | time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2; | |
494 | } | |
495 | ||
496 | #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ | |
497 | do { \ | |
498 | (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ | |
499 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
500 | (raw_inode)->xtime ## _extra = \ | |
501 | ext4_encode_extra_time(&(inode)->xtime); \ | |
502 | } while (0) | |
503 | ||
504 | #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ | |
505 | do { \ | |
506 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
507 | (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ | |
508 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | |
509 | (raw_inode)->xtime ## _extra = \ | |
510 | ext4_encode_extra_time(&(einode)->xtime); \ | |
511 | } while (0) | |
512 | ||
513 | #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ | |
514 | do { \ | |
515 | (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ | |
516 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
517 | ext4_decode_extra_time(&(inode)->xtime, \ | |
518 | raw_inode->xtime ## _extra); \ | |
519 | } while (0) | |
520 | ||
521 | #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ | |
522 | do { \ | |
523 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
524 | (einode)->xtime.tv_sec = \ | |
525 | (signed)le32_to_cpu((raw_inode)->xtime); \ | |
526 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | |
527 | ext4_decode_extra_time(&(einode)->xtime, \ | |
528 | raw_inode->xtime ## _extra); \ | |
529 | } while (0) | |
530 | ||
25ec56b5 JNC |
531 | #define i_disk_version osd1.linux1.l_i_version |
532 | ||
ac27a0ec DK |
533 | #if defined(__KERNEL__) || defined(__linux__) |
534 | #define i_reserved1 osd1.linux1.l_i_reserved1 | |
a1ddeb7e | 535 | #define i_file_acl_high osd2.linux2.l_i_file_acl_high |
0fc1b451 | 536 | #define i_blocks_high osd2.linux2.l_i_blocks_high |
ac27a0ec DK |
537 | #define i_uid_low i_uid |
538 | #define i_gid_low i_gid | |
539 | #define i_uid_high osd2.linux2.l_i_uid_high | |
540 | #define i_gid_high osd2.linux2.l_i_gid_high | |
541 | #define i_reserved2 osd2.linux2.l_i_reserved2 | |
542 | ||
543 | #elif defined(__GNU__) | |
544 | ||
545 | #define i_translator osd1.hurd1.h_i_translator | |
ac27a0ec DK |
546 | #define i_uid_high osd2.hurd2.h_i_uid_high |
547 | #define i_gid_high osd2.hurd2.h_i_gid_high | |
548 | #define i_author osd2.hurd2.h_i_author | |
549 | ||
550 | #elif defined(__masix__) | |
551 | ||
552 | #define i_reserved1 osd1.masix1.m_i_reserved1 | |
a1ddeb7e | 553 | #define i_file_acl_high osd2.masix2.m_i_file_acl_high |
ac27a0ec DK |
554 | #define i_reserved2 osd2.masix2.m_i_reserved2 |
555 | ||
556 | #endif /* defined(__KERNEL__) || defined(__linux__) */ | |
557 | ||
d444c3c3 TT |
558 | /* |
559 | * storage for cached extent | |
560 | */ | |
561 | struct ext4_ext_cache { | |
562 | ext4_fsblk_t ec_start; | |
563 | ext4_lblk_t ec_block; | |
564 | __u32 ec_len; /* must be 32bit to return holes */ | |
565 | __u32 ec_type; | |
566 | }; | |
567 | ||
568 | /* | |
569 | * fourth extended file system inode data in memory | |
570 | */ | |
571 | struct ext4_inode_info { | |
572 | __le32 i_data[15]; /* unconverted */ | |
573 | __u32 i_flags; | |
574 | ext4_fsblk_t i_file_acl; | |
575 | __u32 i_dtime; | |
576 | ||
577 | /* | |
578 | * i_block_group is the number of the block group which contains | |
579 | * this file's inode. Constant across the lifetime of the inode, | |
580 | * it is ued for making block allocation decisions - we try to | |
581 | * place a file's data blocks near its inode block, and new inodes | |
582 | * near to their parent directory's inode. | |
583 | */ | |
584 | ext4_group_t i_block_group; | |
585 | __u32 i_state; /* Dynamic state flags for ext4 */ | |
586 | ||
587 | ext4_lblk_t i_dir_start_lookup; | |
588 | #ifdef CONFIG_EXT4_FS_XATTR | |
589 | /* | |
590 | * Extended attributes can be read independently of the main file | |
591 | * data. Taking i_mutex even when reading would cause contention | |
592 | * between readers of EAs and writers of regular file data, so | |
593 | * instead we synchronize on xattr_sem when reading or changing | |
594 | * EAs. | |
595 | */ | |
596 | struct rw_semaphore xattr_sem; | |
597 | #endif | |
d444c3c3 TT |
598 | |
599 | struct list_head i_orphan; /* unlinked but open inodes */ | |
600 | ||
601 | /* | |
602 | * i_disksize keeps track of what the inode size is ON DISK, not | |
603 | * in memory. During truncate, i_size is set to the new size by | |
604 | * the VFS prior to calling ext4_truncate(), but the filesystem won't | |
605 | * set i_disksize to 0 until the truncate is actually under way. | |
606 | * | |
607 | * The intent is that i_disksize always represents the blocks which | |
608 | * are used by this file. This allows recovery to restart truncate | |
609 | * on orphans if we crash during truncate. We actually write i_disksize | |
610 | * into the on-disk inode when writing inodes out, instead of i_size. | |
611 | * | |
612 | * The only time when i_disksize and i_size may be different is when | |
613 | * a truncate is in progress. The only things which change i_disksize | |
614 | * are ext4_get_block (growth) and ext4_truncate (shrinkth). | |
615 | */ | |
616 | loff_t i_disksize; | |
617 | ||
618 | /* | |
619 | * i_data_sem is for serialising ext4_truncate() against | |
620 | * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's | |
621 | * data tree are chopped off during truncate. We can't do that in | |
622 | * ext4 because whenever we perform intermediate commits during | |
623 | * truncate, the inode and all the metadata blocks *must* be in a | |
624 | * consistent state which allows truncation of the orphans to restart | |
625 | * during recovery. Hence we must fix the get_block-vs-truncate race | |
626 | * by other means, so we have i_data_sem. | |
627 | */ | |
628 | struct rw_semaphore i_data_sem; | |
629 | struct inode vfs_inode; | |
630 | struct jbd2_inode jinode; | |
631 | ||
632 | struct ext4_ext_cache i_cached_extent; | |
633 | /* | |
634 | * File creation time. Its function is same as that of | |
635 | * struct timespec i_{a,c,m}time in the generic inode. | |
636 | */ | |
637 | struct timespec i_crtime; | |
638 | ||
639 | /* mballoc */ | |
640 | struct list_head i_prealloc_list; | |
641 | spinlock_t i_prealloc_lock; | |
642 | ||
643 | /* ialloc */ | |
644 | ext4_group_t i_last_alloc_group; | |
645 | ||
646 | /* allocation reservation info for delalloc */ | |
647 | unsigned int i_reserved_data_blocks; | |
648 | unsigned int i_reserved_meta_blocks; | |
649 | unsigned int i_allocated_meta_blocks; | |
650 | unsigned short i_delalloc_reserved_flag; | |
651 | ||
652 | /* on-disk additional length */ | |
653 | __u16 i_extra_isize; | |
654 | ||
655 | spinlock_t i_block_reservation_lock; | |
656 | }; | |
657 | ||
ac27a0ec DK |
658 | /* |
659 | * File system states | |
660 | */ | |
617ba13b MC |
661 | #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ |
662 | #define EXT4_ERROR_FS 0x0002 /* Errors detected */ | |
663 | #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ | |
ac27a0ec | 664 | |
469108ff TT |
665 | /* |
666 | * Misc. filesystem flags | |
667 | */ | |
668 | #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ | |
669 | #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ | |
670 | #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ | |
671 | ||
ac27a0ec DK |
672 | /* |
673 | * Mount flags | |
674 | */ | |
617ba13b MC |
675 | #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ |
676 | #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ | |
677 | #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ | |
678 | #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ | |
679 | #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ | |
680 | #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ | |
681 | #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ | |
682 | #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ | |
617ba13b MC |
683 | #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ |
684 | #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ | |
685 | #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ | |
686 | #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ | |
687 | #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ | |
688 | #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ | |
689 | #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ | |
690 | #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ | |
afd4672d | 691 | #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ |
617ba13b MC |
692 | #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ |
693 | #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ | |
694 | #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ | |
695 | #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ | |
696 | #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ | |
818d276c GS |
697 | #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ |
698 | #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ | |
25ec56b5 | 699 | #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ |
64769240 | 700 | #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ |
5bf5683a | 701 | #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ |
6fd058f7 | 702 | #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ |
5bf5683a | 703 | |
617ba13b MC |
704 | #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt |
705 | #define set_opt(o, opt) o |= EXT4_MOUNT_##opt | |
706 | #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ | |
707 | EXT4_MOUNT_##opt) | |
ac27a0ec | 708 | |
617ba13b MC |
709 | #define ext4_set_bit ext2_set_bit |
710 | #define ext4_set_bit_atomic ext2_set_bit_atomic | |
711 | #define ext4_clear_bit ext2_clear_bit | |
712 | #define ext4_clear_bit_atomic ext2_clear_bit_atomic | |
713 | #define ext4_test_bit ext2_test_bit | |
714 | #define ext4_find_first_zero_bit ext2_find_first_zero_bit | |
715 | #define ext4_find_next_zero_bit ext2_find_next_zero_bit | |
aa02ad67 | 716 | #define ext4_find_next_bit ext2_find_next_bit |
ac27a0ec DK |
717 | |
718 | /* | |
719 | * Maximal mount counts between two filesystem checks | |
720 | */ | |
617ba13b MC |
721 | #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ |
722 | #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ | |
ac27a0ec DK |
723 | |
724 | /* | |
725 | * Behaviour when detecting errors | |
726 | */ | |
617ba13b MC |
727 | #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ |
728 | #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ | |
729 | #define EXT4_ERRORS_PANIC 3 /* Panic */ | |
730 | #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE | |
ac27a0ec DK |
731 | |
732 | /* | |
733 | * Structure of the super block | |
734 | */ | |
617ba13b | 735 | struct ext4_super_block { |
ac27a0ec | 736 | /*00*/ __le32 s_inodes_count; /* Inodes count */ |
6bc9feff | 737 | __le32 s_blocks_count_lo; /* Blocks count */ |
308ba3ec AK |
738 | __le32 s_r_blocks_count_lo; /* Reserved blocks count */ |
739 | __le32 s_free_blocks_count_lo; /* Free blocks count */ | |
ac27a0ec DK |
740 | /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ |
741 | __le32 s_first_data_block; /* First Data Block */ | |
742 | __le32 s_log_block_size; /* Block size */ | |
f077d0d7 | 743 | __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ |
ac27a0ec | 744 | /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ |
f077d0d7 | 745 | __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ |
ac27a0ec DK |
746 | __le32 s_inodes_per_group; /* # Inodes per group */ |
747 | __le32 s_mtime; /* Mount time */ | |
748 | /*30*/ __le32 s_wtime; /* Write time */ | |
749 | __le16 s_mnt_count; /* Mount count */ | |
750 | __le16 s_max_mnt_count; /* Maximal mount count */ | |
751 | __le16 s_magic; /* Magic signature */ | |
752 | __le16 s_state; /* File system state */ | |
753 | __le16 s_errors; /* Behaviour when detecting errors */ | |
754 | __le16 s_minor_rev_level; /* minor revision level */ | |
755 | /*40*/ __le32 s_lastcheck; /* time of last check */ | |
756 | __le32 s_checkinterval; /* max. time between checks */ | |
757 | __le32 s_creator_os; /* OS */ | |
758 | __le32 s_rev_level; /* Revision level */ | |
759 | /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ | |
760 | __le16 s_def_resgid; /* Default gid for reserved blocks */ | |
761 | /* | |
617ba13b | 762 | * These fields are for EXT4_DYNAMIC_REV superblocks only. |
ac27a0ec DK |
763 | * |
764 | * Note: the difference between the compatible feature set and | |
765 | * the incompatible feature set is that if there is a bit set | |
766 | * in the incompatible feature set that the kernel doesn't | |
767 | * know about, it should refuse to mount the filesystem. | |
768 | * | |
769 | * e2fsck's requirements are more strict; if it doesn't know | |
770 | * about a feature in either the compatible or incompatible | |
771 | * feature set, it must abort and not try to meddle with | |
772 | * things it doesn't understand... | |
773 | */ | |
774 | __le32 s_first_ino; /* First non-reserved inode */ | |
0d1ee42f | 775 | __le16 s_inode_size; /* size of inode structure */ |
ac27a0ec DK |
776 | __le16 s_block_group_nr; /* block group # of this superblock */ |
777 | __le32 s_feature_compat; /* compatible feature set */ | |
778 | /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ | |
779 | __le32 s_feature_ro_compat; /* readonly-compatible feature set */ | |
780 | /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ | |
781 | /*78*/ char s_volume_name[16]; /* volume name */ | |
782 | /*88*/ char s_last_mounted[64]; /* directory where last mounted */ | |
783 | /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ | |
784 | /* | |
785 | * Performance hints. Directory preallocation should only | |
617ba13b | 786 | * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. |
ac27a0ec DK |
787 | */ |
788 | __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ | |
789 | __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ | |
790 | __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ | |
791 | /* | |
617ba13b | 792 | * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. |
ac27a0ec DK |
793 | */ |
794 | /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ | |
795 | /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ | |
796 | __le32 s_journal_dev; /* device number of journal file */ | |
797 | __le32 s_last_orphan; /* start of list of inodes to delete */ | |
798 | __le32 s_hash_seed[4]; /* HTREE hash seed */ | |
799 | __u8 s_def_hash_version; /* Default hash version to use */ | |
800 | __u8 s_reserved_char_pad; | |
0d1ee42f | 801 | __le16 s_desc_size; /* size of group descriptor */ |
bd81d8ee | 802 | /*100*/ __le32 s_default_mount_opts; |
ac27a0ec | 803 | __le32 s_first_meta_bg; /* First metablock block group */ |
bd81d8ee LV |
804 | __le32 s_mkfs_time; /* When the filesystem was created */ |
805 | __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ | |
806 | /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ | |
807 | /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ | |
808 | __le32 s_r_blocks_count_hi; /* Reserved blocks count */ | |
809 | __le32 s_free_blocks_count_hi; /* Free blocks count */ | |
c1bddad9 AK |
810 | __le16 s_min_extra_isize; /* All inodes have at least # bytes */ |
811 | __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ | |
812 | __le32 s_flags; /* Miscellaneous flags */ | |
813 | __le16 s_raid_stride; /* RAID stride */ | |
814 | __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ | |
815 | __le64 s_mmp_block; /* Block for multi-mount protection */ | |
816 | __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ | |
772cb7c8 JS |
817 | __u8 s_log_groups_per_flex; /* FLEX_BG group size */ |
818 | __u8 s_reserved_char_pad2; | |
819 | __le16 s_reserved_pad; | |
afc32f7e TT |
820 | __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ |
821 | __u32 s_reserved[160]; /* Padding to the end of the block */ | |
ac27a0ec DK |
822 | }; |
823 | ||
824 | #ifdef __KERNEL__ | |
bc0b0d6d TT |
825 | |
826 | /* | |
4ab2f15b | 827 | * run-time mount flags |
bc0b0d6d TT |
828 | */ |
829 | #define EXT4_MF_MNTDIR_SAMPLED 0x0001 | |
4ab2f15b | 830 | #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ |
bc0b0d6d | 831 | |
ca0faba0 TT |
832 | /* |
833 | * fourth extended-fs super-block data in memory | |
834 | */ | |
835 | struct ext4_sb_info { | |
836 | unsigned long s_desc_size; /* Size of a group descriptor in bytes */ | |
837 | unsigned long s_inodes_per_block;/* Number of inodes per block */ | |
838 | unsigned long s_blocks_per_group;/* Number of blocks in a group */ | |
839 | unsigned long s_inodes_per_group;/* Number of inodes in a group */ | |
840 | unsigned long s_itb_per_group; /* Number of inode table blocks per group */ | |
841 | unsigned long s_gdb_count; /* Number of group descriptor blocks */ | |
842 | unsigned long s_desc_per_block; /* Number of group descriptors per block */ | |
843 | ext4_group_t s_groups_count; /* Number of groups in the fs */ | |
844 | unsigned long s_overhead_last; /* Last calculated overhead */ | |
845 | unsigned long s_blocks_last; /* Last seen block count */ | |
846 | loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ | |
847 | struct buffer_head * s_sbh; /* Buffer containing the super block */ | |
848 | struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ | |
849 | struct buffer_head **s_group_desc; | |
7f4520cc | 850 | unsigned int s_mount_opt; |
bc0b0d6d | 851 | unsigned int s_mount_flags; |
ca0faba0 TT |
852 | ext4_fsblk_t s_sb_block; |
853 | uid_t s_resuid; | |
854 | gid_t s_resgid; | |
855 | unsigned short s_mount_state; | |
856 | unsigned short s_pad; | |
857 | int s_addr_per_block_bits; | |
858 | int s_desc_per_block_bits; | |
859 | int s_inode_size; | |
860 | int s_first_ino; | |
861 | unsigned int s_inode_readahead_blks; | |
11013911 | 862 | unsigned int s_inode_goal; |
ca0faba0 TT |
863 | spinlock_t s_next_gen_lock; |
864 | u32 s_next_generation; | |
865 | u32 s_hash_seed[4]; | |
866 | int s_def_hash_version; | |
867 | int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ | |
868 | struct percpu_counter s_freeblocks_counter; | |
869 | struct percpu_counter s_freeinodes_counter; | |
870 | struct percpu_counter s_dirs_counter; | |
871 | struct percpu_counter s_dirtyblocks_counter; | |
872 | struct blockgroup_lock *s_blockgroup_lock; | |
873 | struct proc_dir_entry *s_proc; | |
874 | struct kobject s_kobj; | |
875 | struct completion s_kobj_unregister; | |
876 | ||
877 | /* Journaling */ | |
878 | struct inode *s_journal_inode; | |
879 | struct journal_s *s_journal; | |
880 | struct list_head s_orphan; | |
881 | struct mutex s_orphan_lock; | |
882 | struct mutex s_resize_lock; | |
883 | unsigned long s_commit_interval; | |
884 | u32 s_max_batch_time; | |
885 | u32 s_min_batch_time; | |
886 | struct block_device *journal_bdev; | |
887 | #ifdef CONFIG_JBD2_DEBUG | |
888 | struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */ | |
889 | wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */ | |
890 | #endif | |
891 | #ifdef CONFIG_QUOTA | |
892 | char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ | |
893 | int s_jquota_fmt; /* Format of quota to use */ | |
894 | #endif | |
895 | unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ | |
6fd058f7 | 896 | struct rb_root system_blks; |
ca0faba0 TT |
897 | |
898 | #ifdef EXTENTS_STATS | |
899 | /* ext4 extents stats */ | |
900 | unsigned long s_ext_min; | |
901 | unsigned long s_ext_max; | |
902 | unsigned long s_depth_max; | |
903 | spinlock_t s_ext_stats_lock; | |
904 | unsigned long s_ext_blocks; | |
905 | unsigned long s_ext_extents; | |
906 | #endif | |
907 | ||
908 | /* for buddy allocator */ | |
909 | struct ext4_group_info ***s_group_info; | |
910 | struct inode *s_buddy_cache; | |
911 | long s_blocks_reserved; | |
912 | spinlock_t s_reserve_lock; | |
913 | spinlock_t s_md_lock; | |
914 | tid_t s_last_transaction; | |
915 | unsigned short *s_mb_offsets; | |
916 | unsigned int *s_mb_maxs; | |
917 | ||
918 | /* tunables */ | |
919 | unsigned long s_stripe; | |
920 | unsigned int s_mb_stream_request; | |
921 | unsigned int s_mb_max_to_scan; | |
922 | unsigned int s_mb_min_to_scan; | |
923 | unsigned int s_mb_stats; | |
924 | unsigned int s_mb_order2_reqs; | |
925 | unsigned int s_mb_group_prealloc; | |
926 | /* where last allocation was done - for stream allocation */ | |
927 | unsigned long s_mb_last_group; | |
928 | unsigned long s_mb_last_start; | |
929 | ||
930 | /* history to debug policy */ | |
931 | struct ext4_mb_history *s_mb_history; | |
932 | int s_mb_history_cur; | |
933 | int s_mb_history_max; | |
934 | int s_mb_history_num; | |
935 | spinlock_t s_mb_history_lock; | |
936 | int s_mb_history_filter; | |
937 | ||
938 | /* stats for buddy allocator */ | |
939 | spinlock_t s_mb_pa_lock; | |
940 | atomic_t s_bal_reqs; /* number of reqs with len > 1 */ | |
941 | atomic_t s_bal_success; /* we found long enough chunks */ | |
942 | atomic_t s_bal_allocated; /* in blocks */ | |
943 | atomic_t s_bal_ex_scanned; /* total extents scanned */ | |
944 | atomic_t s_bal_goals; /* goal hits */ | |
945 | atomic_t s_bal_breaks; /* too long searches */ | |
946 | atomic_t s_bal_2orders; /* 2^order hits */ | |
947 | spinlock_t s_bal_lock; | |
948 | unsigned long s_mb_buddies_generated; | |
949 | unsigned long long s_mb_generation_time; | |
950 | atomic_t s_mb_lost_chunks; | |
951 | atomic_t s_mb_preallocated; | |
952 | atomic_t s_mb_discarded; | |
953 | ||
954 | /* locality groups */ | |
955 | struct ext4_locality_group *s_locality_groups; | |
956 | ||
957 | /* for write statistics */ | |
958 | unsigned long s_sectors_written_start; | |
959 | u64 s_kbytes_written; | |
960 | ||
961 | unsigned int s_log_groups_per_flex; | |
962 | struct flex_groups *s_flex_groups; | |
963 | }; | |
964 | ||
af5bc92d | 965 | static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) |
ac27a0ec DK |
966 | { |
967 | return sb->s_fs_info; | |
968 | } | |
617ba13b | 969 | static inline struct ext4_inode_info *EXT4_I(struct inode *inode) |
ac27a0ec | 970 | { |
617ba13b | 971 | return container_of(inode, struct ext4_inode_info, vfs_inode); |
ac27a0ec DK |
972 | } |
973 | ||
ef7f3835 KS |
974 | static inline struct timespec ext4_current_time(struct inode *inode) |
975 | { | |
976 | return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? | |
977 | current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; | |
978 | } | |
979 | ||
617ba13b | 980 | static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) |
ac27a0ec | 981 | { |
617ba13b MC |
982 | return ino == EXT4_ROOT_INO || |
983 | ino == EXT4_JOURNAL_INO || | |
984 | ino == EXT4_RESIZE_INO || | |
985 | (ino >= EXT4_FIRST_INO(sb) && | |
986 | ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); | |
ac27a0ec DK |
987 | } |
988 | #else | |
617ba13b | 989 | /* Assume that user mode programs are passing in an ext4fs superblock, not |
ac27a0ec DK |
990 | * a kernel struct super_block. This will allow us to call the feature-test |
991 | * macros from user land. */ | |
617ba13b | 992 | #define EXT4_SB(sb) (sb) |
ac27a0ec DK |
993 | #endif |
994 | ||
617ba13b | 995 | #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime |
ac27a0ec DK |
996 | |
997 | /* | |
998 | * Codes for operating systems | |
999 | */ | |
617ba13b MC |
1000 | #define EXT4_OS_LINUX 0 |
1001 | #define EXT4_OS_HURD 1 | |
1002 | #define EXT4_OS_MASIX 2 | |
1003 | #define EXT4_OS_FREEBSD 3 | |
1004 | #define EXT4_OS_LITES 4 | |
ac27a0ec DK |
1005 | |
1006 | /* | |
1007 | * Revision levels | |
1008 | */ | |
617ba13b MC |
1009 | #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ |
1010 | #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ | |
ac27a0ec | 1011 | |
617ba13b MC |
1012 | #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV |
1013 | #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV | |
ac27a0ec | 1014 | |
617ba13b | 1015 | #define EXT4_GOOD_OLD_INODE_SIZE 128 |
ac27a0ec DK |
1016 | |
1017 | /* | |
1018 | * Feature set definitions | |
1019 | */ | |
1020 | ||
617ba13b | 1021 | #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ |
3a06d778 | 1022 | ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) |
617ba13b | 1023 | #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ |
3a06d778 | 1024 | ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) |
617ba13b | 1025 | #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ |
3a06d778 | 1026 | ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) |
617ba13b MC |
1027 | #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ |
1028 | EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) | |
1029 | #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ | |
1030 | EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) | |
1031 | #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ | |
1032 | EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) | |
1033 | #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ | |
1034 | EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) | |
1035 | #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ | |
1036 | EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) | |
1037 | #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ | |
1038 | EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) | |
1039 | ||
1040 | #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 | |
1041 | #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 | |
1042 | #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 | |
1043 | #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 | |
1044 | #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 | |
1045 | #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 | |
1046 | ||
1047 | #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 | |
1048 | #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 | |
1049 | #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 | |
0fc1b451 | 1050 | #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 |
717d50e4 | 1051 | #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 |
f8628a14 | 1052 | #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 |
ef7f3835 | 1053 | #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 |
617ba13b MC |
1054 | |
1055 | #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 | |
1056 | #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 | |
1057 | #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ | |
1058 | #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ | |
1059 | #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 | |
a86c6181 | 1060 | #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ |
bd81d8ee | 1061 | #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 |
0fc1b451 | 1062 | #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 |
ce421581 | 1063 | #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 |
617ba13b MC |
1064 | |
1065 | #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR | |
1066 | #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ | |
1067 | EXT4_FEATURE_INCOMPAT_RECOVER| \ | |
a86c6181 | 1068 | EXT4_FEATURE_INCOMPAT_META_BG| \ |
bd81d8ee | 1069 | EXT4_FEATURE_INCOMPAT_EXTENTS| \ |
ce421581 JS |
1070 | EXT4_FEATURE_INCOMPAT_64BIT| \ |
1071 | EXT4_FEATURE_INCOMPAT_FLEX_BG) | |
617ba13b MC |
1072 | #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
1073 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
717d50e4 | 1074 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ |
f8628a14 | 1075 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ |
ef7f3835 | 1076 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ |
0fc1b451 AK |
1077 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ |
1078 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE) | |
ac27a0ec DK |
1079 | |
1080 | /* | |
1081 | * Default values for user and/or group using reserved blocks | |
1082 | */ | |
617ba13b MC |
1083 | #define EXT4_DEF_RESUID 0 |
1084 | #define EXT4_DEF_RESGID 0 | |
ac27a0ec | 1085 | |
240799cd TT |
1086 | #define EXT4_DEF_INODE_READAHEAD_BLKS 32 |
1087 | ||
ac27a0ec DK |
1088 | /* |
1089 | * Default mount options | |
1090 | */ | |
617ba13b MC |
1091 | #define EXT4_DEFM_DEBUG 0x0001 |
1092 | #define EXT4_DEFM_BSDGROUPS 0x0002 | |
1093 | #define EXT4_DEFM_XATTR_USER 0x0004 | |
1094 | #define EXT4_DEFM_ACL 0x0008 | |
1095 | #define EXT4_DEFM_UID16 0x0010 | |
1096 | #define EXT4_DEFM_JMODE 0x0060 | |
1097 | #define EXT4_DEFM_JMODE_DATA 0x0020 | |
1098 | #define EXT4_DEFM_JMODE_ORDERED 0x0040 | |
1099 | #define EXT4_DEFM_JMODE_WBACK 0x0060 | |
ac27a0ec | 1100 | |
30773840 TT |
1101 | /* |
1102 | * Default journal batch times | |
1103 | */ | |
1104 | #define EXT4_DEF_MIN_BATCH_TIME 0 | |
1105 | #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ | |
1106 | ||
a4912123 TT |
1107 | /* |
1108 | * Minimum number of groups in a flexgroup before we separate out | |
1109 | * directories into the first block group of a flexgroup | |
1110 | */ | |
1111 | #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 | |
1112 | ||
ac27a0ec DK |
1113 | /* |
1114 | * Structure of a directory entry | |
1115 | */ | |
617ba13b | 1116 | #define EXT4_NAME_LEN 255 |
ac27a0ec | 1117 | |
617ba13b | 1118 | struct ext4_dir_entry { |
ac27a0ec DK |
1119 | __le32 inode; /* Inode number */ |
1120 | __le16 rec_len; /* Directory entry length */ | |
1121 | __le16 name_len; /* Name length */ | |
617ba13b | 1122 | char name[EXT4_NAME_LEN]; /* File name */ |
ac27a0ec DK |
1123 | }; |
1124 | ||
1125 | /* | |
617ba13b | 1126 | * The new version of the directory entry. Since EXT4 structures are |
ac27a0ec DK |
1127 | * stored in intel byte order, and the name_len field could never be |
1128 | * bigger than 255 chars, it's safe to reclaim the extra byte for the | |
1129 | * file_type field. | |
1130 | */ | |
617ba13b | 1131 | struct ext4_dir_entry_2 { |
ac27a0ec DK |
1132 | __le32 inode; /* Inode number */ |
1133 | __le16 rec_len; /* Directory entry length */ | |
1134 | __u8 name_len; /* Name length */ | |
1135 | __u8 file_type; | |
617ba13b | 1136 | char name[EXT4_NAME_LEN]; /* File name */ |
ac27a0ec DK |
1137 | }; |
1138 | ||
1139 | /* | |
617ba13b | 1140 | * Ext4 directory file types. Only the low 3 bits are used. The |
ac27a0ec DK |
1141 | * other bits are reserved for now. |
1142 | */ | |
617ba13b MC |
1143 | #define EXT4_FT_UNKNOWN 0 |
1144 | #define EXT4_FT_REG_FILE 1 | |
1145 | #define EXT4_FT_DIR 2 | |
1146 | #define EXT4_FT_CHRDEV 3 | |
1147 | #define EXT4_FT_BLKDEV 4 | |
1148 | #define EXT4_FT_FIFO 5 | |
1149 | #define EXT4_FT_SOCK 6 | |
1150 | #define EXT4_FT_SYMLINK 7 | |
ac27a0ec | 1151 | |
617ba13b | 1152 | #define EXT4_FT_MAX 8 |
ac27a0ec DK |
1153 | |
1154 | /* | |
617ba13b | 1155 | * EXT4_DIR_PAD defines the directory entries boundaries |
ac27a0ec DK |
1156 | * |
1157 | * NOTE: It must be a multiple of 4 | |
1158 | */ | |
617ba13b MC |
1159 | #define EXT4_DIR_PAD 4 |
1160 | #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) | |
1161 | #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ | |
1162 | ~EXT4_DIR_ROUND) | |
a72d7f83 JK |
1163 | #define EXT4_MAX_REC_LEN ((1<<16)-1) |
1164 | ||
ac27a0ec DK |
1165 | /* |
1166 | * Hash Tree Directory indexing | |
1167 | * (c) Daniel Phillips, 2001 | |
1168 | */ | |
1169 | ||
4074fe37 ES |
1170 | #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ |
1171 | EXT4_FEATURE_COMPAT_DIR_INDEX) && \ | |
617ba13b MC |
1172 | (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) |
1173 | #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) | |
1174 | #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) | |
ac27a0ec DK |
1175 | |
1176 | /* Legal values for the dx_root hash_version field: */ | |
1177 | ||
1178 | #define DX_HASH_LEGACY 0 | |
1179 | #define DX_HASH_HALF_MD4 1 | |
1180 | #define DX_HASH_TEA 2 | |
f99b2589 TT |
1181 | #define DX_HASH_LEGACY_UNSIGNED 3 |
1182 | #define DX_HASH_HALF_MD4_UNSIGNED 4 | |
1183 | #define DX_HASH_TEA_UNSIGNED 5 | |
ac27a0ec DK |
1184 | |
1185 | #ifdef __KERNEL__ | |
1186 | ||
1187 | /* hash info structure used by the directory hash */ | |
1188 | struct dx_hash_info | |
1189 | { | |
1190 | u32 hash; | |
1191 | u32 minor_hash; | |
1192 | int hash_version; | |
1193 | u32 *seed; | |
1194 | }; | |
1195 | ||
617ba13b | 1196 | #define EXT4_HTREE_EOF 0x7fffffff |
ac27a0ec DK |
1197 | |
1198 | /* | |
617ba13b | 1199 | * Control parameters used by ext4_htree_next_block |
ac27a0ec DK |
1200 | */ |
1201 | #define HASH_NB_ALWAYS 1 | |
1202 | ||
1203 | ||
1204 | /* | |
1205 | * Describe an inode's exact location on disk and in memory | |
1206 | */ | |
617ba13b | 1207 | struct ext4_iloc |
ac27a0ec DK |
1208 | { |
1209 | struct buffer_head *bh; | |
1210 | unsigned long offset; | |
fd2d4291 | 1211 | ext4_group_t block_group; |
ac27a0ec DK |
1212 | }; |
1213 | ||
617ba13b | 1214 | static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) |
ac27a0ec | 1215 | { |
617ba13b | 1216 | return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); |
ac27a0ec DK |
1217 | } |
1218 | ||
1219 | /* | |
1220 | * This structure is stuffed into the struct file's private_data field | |
1221 | * for directories. It is where we put information so that we can do | |
1222 | * readdir operations in hash tree order. | |
1223 | */ | |
1224 | struct dir_private_info { | |
1225 | struct rb_root root; | |
1226 | struct rb_node *curr_node; | |
1227 | struct fname *extra_fname; | |
1228 | loff_t last_pos; | |
1229 | __u32 curr_hash; | |
1230 | __u32 curr_minor_hash; | |
1231 | __u32 next_hash; | |
1232 | }; | |
1233 | ||
1234 | /* calculate the first block number of the group */ | |
617ba13b | 1235 | static inline ext4_fsblk_t |
fd2d4291 | 1236 | ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) |
ac27a0ec | 1237 | { |
617ba13b MC |
1238 | return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + |
1239 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); | |
ac27a0ec DK |
1240 | } |
1241 | ||
1242 | /* | |
1243 | * Special error return code only used by dx_probe() and its callers. | |
1244 | */ | |
1245 | #define ERR_BAD_DX_DIR -75000 | |
1246 | ||
72b64b59 | 1247 | void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, |
a9df9a49 | 1248 | ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); |
3a5b2ecd | 1249 | |
9f6200bb TT |
1250 | extern struct proc_dir_entry *ext4_proc_root; |
1251 | ||
ac27a0ec DK |
1252 | /* |
1253 | * Function prototypes | |
1254 | */ | |
1255 | ||
1256 | /* | |
1257 | * Ok, these declarations are also in <linux/kernel.h> but none of the | |
617ba13b | 1258 | * ext4 source programs needs to include it so they are duplicated here. |
ac27a0ec | 1259 | */ |
8c55e204 DK |
1260 | # define NORET_TYPE /**/ |
1261 | # define ATTRIB_NORET __attribute__((noreturn)) | |
1262 | # define NORET_AND noreturn, | |
ac27a0ec | 1263 | |
498e5f24 TT |
1264 | /* bitmap.c */ |
1265 | extern unsigned int ext4_count_free(struct buffer_head *, unsigned); | |
1266 | ||
ac27a0ec | 1267 | /* balloc.c */ |
3a5b2ecd MC |
1268 | extern unsigned int ext4_block_group(struct super_block *sb, |
1269 | ext4_fsblk_t blocknr); | |
1270 | extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, | |
1271 | ext4_fsblk_t blocknr); | |
fd2d4291 AM |
1272 | extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); |
1273 | extern unsigned long ext4_bg_num_gdb(struct super_block *sb, | |
1274 | ext4_group_t group); | |
7061eba7 | 1275 | extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, |
617ba13b | 1276 | ext4_fsblk_t goal, unsigned long *count, int *errp); |
5c791616 | 1277 | extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); |
8c3bf8a0 | 1278 | extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); |
af5bc92d | 1279 | extern void ext4_free_blocks(handle_t *handle, struct inode *inode, |
c9de560d | 1280 | ext4_fsblk_t block, unsigned long count, int metadata); |
e21675d4 AK |
1281 | extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, |
1282 | ext4_fsblk_t block, unsigned long count); | |
af5bc92d TT |
1283 | extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); |
1284 | extern void ext4_check_blocks_bitmap(struct super_block *); | |
617ba13b | 1285 | extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, |
fd2d4291 | 1286 | ext4_group_t block_group, |
ac27a0ec | 1287 | struct buffer_head ** bh); |
617ba13b | 1288 | extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); |
bb23c20a TT |
1289 | struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, |
1290 | ext4_group_t block_group); | |
1291 | extern unsigned ext4_init_block_bitmap(struct super_block *sb, | |
1292 | struct buffer_head *bh, | |
1293 | ext4_group_t group, | |
1294 | struct ext4_group_desc *desc); | |
1295 | #define ext4_free_blocks_after_init(sb, group, desc) \ | |
1296 | ext4_init_block_bitmap(sb, NULL, group, desc) | |
ac27a0ec DK |
1297 | |
1298 | /* dir.c */ | |
617ba13b MC |
1299 | extern int ext4_check_dir_entry(const char *, struct inode *, |
1300 | struct ext4_dir_entry_2 *, | |
498e5f24 | 1301 | struct buffer_head *, unsigned int); |
617ba13b | 1302 | extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, |
ac27a0ec | 1303 | __u32 minor_hash, |
617ba13b MC |
1304 | struct ext4_dir_entry_2 *dirent); |
1305 | extern void ext4_htree_free_dir_info(struct dir_private_info *p); | |
ac27a0ec DK |
1306 | |
1307 | /* fsync.c */ | |
af5bc92d | 1308 | extern int ext4_sync_file(struct file *, struct dentry *, int); |
ac27a0ec DK |
1309 | |
1310 | /* hash.c */ | |
617ba13b | 1311 | extern int ext4fs_dirhash(const char *name, int len, struct |
ac27a0ec DK |
1312 | dx_hash_info *hinfo); |
1313 | ||
1314 | /* ialloc.c */ | |
f157a4aa | 1315 | extern struct inode *ext4_new_inode(handle_t *, struct inode *, int, |
11013911 | 1316 | const struct qstr *qstr, __u32 goal); |
af5bc92d TT |
1317 | extern void ext4_free_inode(handle_t *, struct inode *); |
1318 | extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); | |
1319 | extern unsigned long ext4_count_free_inodes(struct super_block *); | |
1320 | extern unsigned long ext4_count_dirs(struct super_block *); | |
1321 | extern void ext4_check_inodes_bitmap(struct super_block *); | |
bb23c20a TT |
1322 | extern unsigned ext4_init_inode_bitmap(struct super_block *sb, |
1323 | struct buffer_head *bh, | |
1324 | ext4_group_t group, | |
1325 | struct ext4_group_desc *desc); | |
1326 | extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap); | |
ac27a0ec | 1327 | |
c9de560d AT |
1328 | /* mballoc.c */ |
1329 | extern long ext4_mb_stats; | |
1330 | extern long ext4_mb_max_to_scan; | |
1331 | extern int ext4_mb_init(struct super_block *, int); | |
1332 | extern int ext4_mb_release(struct super_block *); | |
1333 | extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, | |
1334 | struct ext4_allocation_request *, int *); | |
1335 | extern int ext4_mb_reserve_blocks(struct super_block *, int); | |
c2ea3fde | 1336 | extern void ext4_discard_preallocations(struct inode *); |
c9de560d AT |
1337 | extern int __init init_ext4_mballoc(void); |
1338 | extern void exit_ext4_mballoc(void); | |
1339 | extern void ext4_mb_free_blocks(handle_t *, struct inode *, | |
0610b6e9 | 1340 | ext4_fsblk_t, unsigned long, int, unsigned long *); |
920313a7 | 1341 | extern int ext4_mb_add_groupinfo(struct super_block *sb, |
5f21b0e6 FB |
1342 | ext4_group_t i, struct ext4_group_desc *desc); |
1343 | extern void ext4_mb_update_group_info(struct ext4_group_info *grp, | |
1344 | ext4_grpblk_t add); | |
920313a7 AK |
1345 | extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); |
1346 | extern void ext4_mb_put_buddy_cache_lock(struct super_block *, | |
1347 | ext4_group_t, int); | |
ac27a0ec | 1348 | /* inode.c */ |
617ba13b MC |
1349 | int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, |
1350 | struct buffer_head *bh, ext4_fsblk_t blocknr); | |
725d26d3 AK |
1351 | struct buffer_head *ext4_getblk(handle_t *, struct inode *, |
1352 | ext4_lblk_t, int, int *); | |
1353 | struct buffer_head *ext4_bread(handle_t *, struct inode *, | |
1354 | ext4_lblk_t, int, int *); | |
6873fa0d ES |
1355 | int ext4_get_block(struct inode *inode, sector_t iblock, |
1356 | struct buffer_head *bh_result, int create); | |
ac27a0ec | 1357 | |
1d1fe1ee | 1358 | extern struct inode *ext4_iget(struct super_block *, unsigned long); |
af5bc92d TT |
1359 | extern int ext4_write_inode(struct inode *, int); |
1360 | extern int ext4_setattr(struct dentry *, struct iattr *); | |
3e3398a0 MC |
1361 | extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, |
1362 | struct kstat *stat); | |
af5bc92d TT |
1363 | extern void ext4_delete_inode(struct inode *); |
1364 | extern int ext4_sync_inode(handle_t *, struct inode *); | |
617ba13b MC |
1365 | extern void ext4_dirty_inode(struct inode *); |
1366 | extern int ext4_change_inode_journal_flag(struct inode *, int); | |
1367 | extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); | |
91ef4caf | 1368 | extern int ext4_can_truncate(struct inode *inode); |
af5bc92d | 1369 | extern void ext4_truncate(struct inode *); |
617ba13b | 1370 | extern void ext4_set_inode_flags(struct inode *); |
ff9ddf7e | 1371 | extern void ext4_get_inode_flags(struct ext4_inode_info *); |
ccd2506b | 1372 | extern int ext4_alloc_da_blocks(struct inode *inode); |
617ba13b | 1373 | extern void ext4_set_aops(struct inode *inode); |
a86c6181 | 1374 | extern int ext4_writepage_trans_blocks(struct inode *); |
a02908f1 | 1375 | extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); |
f3bd1f3f | 1376 | extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); |
cf108bca | 1377 | extern int ext4_block_truncate_page(handle_t *handle, |
a86c6181 | 1378 | struct address_space *mapping, loff_t from); |
c2ec175c | 1379 | extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); |
60e58e0f | 1380 | extern qsize_t ext4_get_reserved_space(struct inode *inode); |
ac27a0ec DK |
1381 | |
1382 | /* ioctl.c */ | |
5cdd7b2d | 1383 | extern long ext4_ioctl(struct file *, unsigned int, unsigned long); |
af5bc92d | 1384 | extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); |
ac27a0ec | 1385 | |
c14c6fd5 | 1386 | /* migrate.c */ |
2a43a878 | 1387 | extern int ext4_ext_migrate(struct inode *); |
3d0518f4 | 1388 | |
ac27a0ec | 1389 | /* namei.c */ |
3d0518f4 WY |
1390 | extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize); |
1391 | extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize); | |
617ba13b MC |
1392 | extern int ext4_orphan_add(handle_t *, struct inode *); |
1393 | extern int ext4_orphan_del(handle_t *, struct inode *); | |
1394 | extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, | |
ac27a0ec DK |
1395 | __u32 start_minor_hash, __u32 *next_hash); |
1396 | ||
1397 | /* resize.c */ | |
617ba13b MC |
1398 | extern int ext4_group_add(struct super_block *sb, |
1399 | struct ext4_new_group_data *input); | |
1400 | extern int ext4_group_extend(struct super_block *sb, | |
1401 | struct ext4_super_block *es, | |
1402 | ext4_fsblk_t n_blocks_count); | |
ac27a0ec DK |
1403 | |
1404 | /* super.c */ | |
af5bc92d | 1405 | extern void ext4_error(struct super_block *, const char *, const char *, ...) |
ac27a0ec | 1406 | __attribute__ ((format (printf, 3, 4))); |
af5bc92d TT |
1407 | extern void __ext4_std_error(struct super_block *, const char *, int); |
1408 | extern void ext4_abort(struct super_block *, const char *, const char *, ...) | |
ac27a0ec | 1409 | __attribute__ ((format (printf, 3, 4))); |
af5bc92d | 1410 | extern void ext4_warning(struct super_block *, const char *, const char *, ...) |
ac27a0ec | 1411 | __attribute__ ((format (printf, 3, 4))); |
b31e1552 ES |
1412 | extern void ext4_msg(struct super_block *, const char *, const char *, ...) |
1413 | __attribute__ ((format (printf, 3, 4))); | |
5d1b1b3f AK |
1414 | extern void ext4_grp_locked_error(struct super_block *, ext4_group_t, |
1415 | const char *, const char *, ...) | |
1416 | __attribute__ ((format (printf, 4, 5))); | |
af5bc92d | 1417 | extern void ext4_update_dynamic_rev(struct super_block *sb); |
99e6f829 AK |
1418 | extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, |
1419 | __u32 compat); | |
1420 | extern int ext4_update_rocompat_feature(handle_t *handle, | |
1421 | struct super_block *sb, __u32 rocompat); | |
1422 | extern int ext4_update_incompat_feature(handle_t *handle, | |
1423 | struct super_block *sb, __u32 incompat); | |
8fadc143 AR |
1424 | extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, |
1425 | struct ext4_group_desc *bg); | |
1426 | extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, | |
1427 | struct ext4_group_desc *bg); | |
1428 | extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, | |
1429 | struct ext4_group_desc *bg); | |
560671a0 AK |
1430 | extern __u32 ext4_free_blks_count(struct super_block *sb, |
1431 | struct ext4_group_desc *bg); | |
1432 | extern __u32 ext4_free_inodes_count(struct super_block *sb, | |
1433 | struct ext4_group_desc *bg); | |
1434 | extern __u32 ext4_used_dirs_count(struct super_block *sb, | |
1435 | struct ext4_group_desc *bg); | |
1436 | extern __u32 ext4_itable_unused_count(struct super_block *sb, | |
1437 | struct ext4_group_desc *bg); | |
8fadc143 AR |
1438 | extern void ext4_block_bitmap_set(struct super_block *sb, |
1439 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
1440 | extern void ext4_inode_bitmap_set(struct super_block *sb, | |
1441 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
1442 | extern void ext4_inode_table_set(struct super_block *sb, | |
1443 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
560671a0 AK |
1444 | extern void ext4_free_blks_set(struct super_block *sb, |
1445 | struct ext4_group_desc *bg, __u32 count); | |
1446 | extern void ext4_free_inodes_set(struct super_block *sb, | |
1447 | struct ext4_group_desc *bg, __u32 count); | |
1448 | extern void ext4_used_dirs_set(struct super_block *sb, | |
1449 | struct ext4_group_desc *bg, __u32 count); | |
1450 | extern void ext4_itable_unused_set(struct super_block *sb, | |
1451 | struct ext4_group_desc *bg, __u32 count); | |
bb23c20a TT |
1452 | extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, |
1453 | struct ext4_group_desc *gdp); | |
1454 | extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, | |
1455 | struct ext4_group_desc *gdp); | |
bd81d8ee LV |
1456 | |
1457 | static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) | |
1458 | { | |
1459 | return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | | |
6bc9feff | 1460 | le32_to_cpu(es->s_blocks_count_lo); |
bd81d8ee LV |
1461 | } |
1462 | ||
1463 | static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) | |
1464 | { | |
1465 | return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | | |
308ba3ec | 1466 | le32_to_cpu(es->s_r_blocks_count_lo); |
bd81d8ee LV |
1467 | } |
1468 | ||
1469 | static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) | |
1470 | { | |
1471 | return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | | |
308ba3ec | 1472 | le32_to_cpu(es->s_free_blocks_count_lo); |
bd81d8ee LV |
1473 | } |
1474 | ||
1475 | static inline void ext4_blocks_count_set(struct ext4_super_block *es, | |
1476 | ext4_fsblk_t blk) | |
1477 | { | |
6bc9feff | 1478 | es->s_blocks_count_lo = cpu_to_le32((u32)blk); |
bd81d8ee LV |
1479 | es->s_blocks_count_hi = cpu_to_le32(blk >> 32); |
1480 | } | |
1481 | ||
1482 | static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, | |
1483 | ext4_fsblk_t blk) | |
1484 | { | |
308ba3ec | 1485 | es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); |
bd81d8ee LV |
1486 | es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); |
1487 | } | |
1488 | ||
1489 | static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, | |
1490 | ext4_fsblk_t blk) | |
1491 | { | |
308ba3ec | 1492 | es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); |
bd81d8ee LV |
1493 | es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); |
1494 | } | |
1495 | ||
a48380f7 AK |
1496 | static inline loff_t ext4_isize(struct ext4_inode *raw_inode) |
1497 | { | |
06a279d6 TT |
1498 | if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) |
1499 | return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | | |
1500 | le32_to_cpu(raw_inode->i_size_lo); | |
1501 | else | |
1502 | return (loff_t) le32_to_cpu(raw_inode->i_size_lo); | |
a48380f7 | 1503 | } |
bd81d8ee | 1504 | |
a48380f7 AK |
1505 | static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) |
1506 | { | |
1507 | raw_inode->i_size_lo = cpu_to_le32(i_size); | |
1508 | raw_inode->i_size_high = cpu_to_le32(i_size >> 32); | |
1509 | } | |
ac27a0ec | 1510 | |
c9de560d AT |
1511 | static inline |
1512 | struct ext4_group_info *ext4_get_group_info(struct super_block *sb, | |
af5bc92d | 1513 | ext4_group_t group) |
c9de560d AT |
1514 | { |
1515 | struct ext4_group_info ***grp_info; | |
1516 | long indexv, indexh; | |
1517 | grp_info = EXT4_SB(sb)->s_group_info; | |
1518 | indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); | |
1519 | indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); | |
1520 | return grp_info[indexv][indexh]; | |
1521 | } | |
1522 | ||
8df9675f TT |
1523 | /* |
1524 | * Reading s_groups_count requires using smp_rmb() afterwards. See | |
1525 | * the locking protocol documented in the comments of ext4_group_add() | |
1526 | * in resize.c | |
1527 | */ | |
1528 | static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) | |
1529 | { | |
1530 | ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; | |
1531 | ||
1532 | smp_rmb(); | |
1533 | return ngroups; | |
1534 | } | |
c9de560d | 1535 | |
772cb7c8 JS |
1536 | static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, |
1537 | ext4_group_t block_group) | |
1538 | { | |
1539 | return block_group >> sbi->s_log_groups_per_flex; | |
1540 | } | |
1541 | ||
1542 | static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) | |
1543 | { | |
1544 | return 1 << sbi->s_log_groups_per_flex; | |
1545 | } | |
1546 | ||
617ba13b | 1547 | #define ext4_std_error(sb, errno) \ |
ac27a0ec DK |
1548 | do { \ |
1549 | if ((errno)) \ | |
4db9c54a | 1550 | __ext4_std_error((sb), __func__, (errno)); \ |
ac27a0ec DK |
1551 | } while (0) |
1552 | ||
a30d542a | 1553 | #ifdef CONFIG_SMP |
179f7ebf | 1554 | /* Each CPU can accumulate percpu_counter_batch blocks in their local |
a30d542a | 1555 | * counters. So we need to make sure we have free blocks more |
179f7ebf | 1556 | * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. |
a30d542a | 1557 | */ |
179f7ebf | 1558 | #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) |
a30d542a AK |
1559 | #else |
1560 | #define EXT4_FREEBLOCKS_WATERMARK 0 | |
1561 | #endif | |
1562 | ||
cf17fea6 AK |
1563 | static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) |
1564 | { | |
1565 | /* | |
1566 | * XXX: replace with spinlock if seen contended -bzzz | |
1567 | */ | |
1568 | down_write(&EXT4_I(inode)->i_data_sem); | |
1569 | if (newsize > EXT4_I(inode)->i_disksize) | |
1570 | EXT4_I(inode)->i_disksize = newsize; | |
1571 | up_write(&EXT4_I(inode)->i_data_sem); | |
1572 | return ; | |
1573 | } | |
a30d542a | 1574 | |
5d1b1b3f AK |
1575 | struct ext4_group_info { |
1576 | unsigned long bb_state; | |
1577 | struct rb_root bb_free_root; | |
1578 | unsigned short bb_first_free; | |
1579 | unsigned short bb_free; | |
1580 | unsigned short bb_fragments; | |
1581 | struct list_head bb_prealloc_list; | |
1582 | #ifdef DOUBLE_CHECK | |
1583 | void *bb_bitmap; | |
1584 | #endif | |
1585 | struct rw_semaphore alloc_sem; | |
1586 | unsigned short bb_counters[]; | |
1587 | }; | |
1588 | ||
1589 | #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 | |
5d1b1b3f AK |
1590 | |
1591 | #define EXT4_MB_GRP_NEED_INIT(grp) \ | |
1592 | (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) | |
1593 | ||
955ce5f5 AK |
1594 | static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, |
1595 | ext4_group_t group) | |
5d1b1b3f | 1596 | { |
955ce5f5 AK |
1597 | return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); |
1598 | } | |
5d1b1b3f | 1599 | |
955ce5f5 AK |
1600 | static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) |
1601 | { | |
1602 | spin_lock(ext4_group_lock_ptr(sb, group)); | |
5d1b1b3f AK |
1603 | } |
1604 | ||
1605 | static inline void ext4_unlock_group(struct super_block *sb, | |
1606 | ext4_group_t group) | |
1607 | { | |
955ce5f5 | 1608 | spin_unlock(ext4_group_lock_ptr(sb, group)); |
5d1b1b3f AK |
1609 | } |
1610 | ||
ac27a0ec DK |
1611 | /* |
1612 | * Inodes and files operations | |
1613 | */ | |
1614 | ||
1615 | /* dir.c */ | |
617ba13b | 1616 | extern const struct file_operations ext4_dir_operations; |
ac27a0ec DK |
1617 | |
1618 | /* file.c */ | |
c5ef1c42 | 1619 | extern const struct inode_operations ext4_file_inode_operations; |
617ba13b | 1620 | extern const struct file_operations ext4_file_operations; |
ac27a0ec DK |
1621 | |
1622 | /* namei.c */ | |
c5ef1c42 AV |
1623 | extern const struct inode_operations ext4_dir_inode_operations; |
1624 | extern const struct inode_operations ext4_special_inode_operations; | |
596397b7 | 1625 | extern struct dentry *ext4_get_parent(struct dentry *child); |
ac27a0ec DK |
1626 | |
1627 | /* symlink.c */ | |
c5ef1c42 AV |
1628 | extern const struct inode_operations ext4_symlink_inode_operations; |
1629 | extern const struct inode_operations ext4_fast_symlink_inode_operations; | |
ac27a0ec | 1630 | |
6fd058f7 TT |
1631 | /* block_validity */ |
1632 | extern void ext4_release_system_zone(struct super_block *sb); | |
1633 | extern int ext4_setup_system_zone(struct super_block *sb); | |
1634 | extern int __init init_ext4_system_zone(void); | |
1635 | extern void exit_ext4_system_zone(void); | |
1636 | extern int ext4_data_block_valid(struct ext4_sb_info *sbi, | |
1637 | ext4_fsblk_t start_blk, | |
1638 | unsigned int count); | |
1639 | ||
a86c6181 AT |
1640 | /* extents.c */ |
1641 | extern int ext4_ext_tree_init(handle_t *handle, struct inode *); | |
1642 | extern int ext4_ext_writepage_trans_blocks(struct inode *, int); | |
a02908f1 MC |
1643 | extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, |
1644 | int chunk); | |
a86c6181 | 1645 | extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, |
498e5f24 | 1646 | ext4_lblk_t iblock, unsigned int max_blocks, |
c2177057 | 1647 | struct buffer_head *bh_result, int flags); |
cf108bca | 1648 | extern void ext4_ext_truncate(struct inode *); |
a86c6181 AT |
1649 | extern void ext4_ext_init(struct super_block *); |
1650 | extern void ext4_ext_release(struct super_block *); | |
a2df2a63 AA |
1651 | extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, |
1652 | loff_t len); | |
12b7ac17 TT |
1653 | extern int ext4_get_blocks(handle_t *handle, struct inode *inode, |
1654 | sector_t block, unsigned int max_blocks, | |
c2177057 | 1655 | struct buffer_head *bh, int flags); |
3a06d778 AK |
1656 | extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
1657 | __u64 start, __u64 len); | |
748de673 AF |
1658 | /* move_extent.c */ |
1659 | extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, | |
1660 | __u64 start_orig, __u64 start_donor, | |
1661 | __u64 len, __u64 *moved_len); | |
1662 | ||
3a06d778 | 1663 | |
2ccb5fb9 AK |
1664 | /* |
1665 | * Add new method to test wether block and inode bitmaps are properly | |
1666 | * initialized. With uninit_bg reading the block from disk is not enough | |
1667 | * to mark the bitmap uptodate. We need to also zero-out the bitmap | |
1668 | */ | |
1669 | #define BH_BITMAP_UPTODATE BH_JBDPrivateStart | |
1670 | ||
1671 | static inline int bitmap_uptodate(struct buffer_head *bh) | |
1672 | { | |
1673 | return (buffer_uptodate(bh) && | |
1674 | test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); | |
1675 | } | |
1676 | static inline void set_bitmap_uptodate(struct buffer_head *bh) | |
1677 | { | |
1678 | set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); | |
1679 | } | |
1680 | ||
ac27a0ec DK |
1681 | #endif /* __KERNEL__ */ |
1682 | ||
3dcf5451 | 1683 | #endif /* _EXT4_H */ |