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 | 69 | /* prefer goal again. length */ |
0ef90db9 | 70 | #define EXT4_MB_HINT_MERGE 0x0001 |
c9de560d | 71 | /* blocks already reserved */ |
0ef90db9 | 72 | #define EXT4_MB_HINT_RESERVED 0x0002 |
c9de560d | 73 | /* metadata is being allocated */ |
0ef90db9 | 74 | #define EXT4_MB_HINT_METADATA 0x0004 |
c9de560d | 75 | /* first blocks in the file */ |
0ef90db9 | 76 | #define EXT4_MB_HINT_FIRST 0x0008 |
c9de560d | 77 | /* search for the best chunk */ |
0ef90db9 | 78 | #define EXT4_MB_HINT_BEST 0x0010 |
c9de560d | 79 | /* data is being allocated */ |
0ef90db9 | 80 | #define EXT4_MB_HINT_DATA 0x0020 |
c9de560d | 81 | /* don't preallocate (for tails) */ |
0ef90db9 | 82 | #define EXT4_MB_HINT_NOPREALLOC 0x0040 |
c9de560d | 83 | /* allocate for locality group */ |
0ef90db9 | 84 | #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 |
c9de560d | 85 | /* allocate goal blocks or none */ |
0ef90db9 | 86 | #define EXT4_MB_HINT_GOAL_ONLY 0x0100 |
c9de560d | 87 | /* goal is meaningful */ |
0ef90db9 | 88 | #define EXT4_MB_HINT_TRY_GOAL 0x0200 |
d2a17637 | 89 | /* blocks already pre-reserved by delayed allocation */ |
0ef90db9 | 90 | #define EXT4_MB_DELALLOC_RESERVED 0x0400 |
4ba74d00 TT |
91 | /* We are doing stream allocation */ |
92 | #define EXT4_MB_STREAM_ALLOC 0x0800 | |
d2a17637 | 93 | |
c9de560d AT |
94 | |
95 | struct ext4_allocation_request { | |
96 | /* target inode for block we're allocating */ | |
97 | struct inode *inode; | |
726447d8 ES |
98 | /* how many blocks we want to allocate */ |
99 | unsigned int len; | |
c9de560d AT |
100 | /* logical block in target inode */ |
101 | ext4_lblk_t logical; | |
c9de560d AT |
102 | /* the closest logical allocated block to the left */ |
103 | ext4_lblk_t lleft; | |
c9de560d AT |
104 | /* the closest logical allocated block to the right */ |
105 | ext4_lblk_t lright; | |
726447d8 ES |
106 | /* phys. target (a hint) */ |
107 | ext4_fsblk_t goal; | |
108 | /* phys. block for the closest logical allocated block to the left */ | |
109 | ext4_fsblk_t pleft; | |
110 | /* phys. block for the closest logical allocated block to the right */ | |
c9de560d | 111 | ext4_fsblk_t pright; |
c9de560d | 112 | /* flags. see above EXT4_MB_HINT_* */ |
498e5f24 | 113 | unsigned int flags; |
c9de560d AT |
114 | }; |
115 | ||
ac27a0ec DK |
116 | /* |
117 | * Special inodes numbers | |
118 | */ | |
617ba13b MC |
119 | #define EXT4_BAD_INO 1 /* Bad blocks inode */ |
120 | #define EXT4_ROOT_INO 2 /* Root inode */ | |
121 | #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ | |
122 | #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ | |
123 | #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ | |
124 | #define EXT4_JOURNAL_INO 8 /* Journal inode */ | |
ac27a0ec | 125 | |
617ba13b MC |
126 | /* First non-reserved inode for old ext4 filesystems */ |
127 | #define EXT4_GOOD_OLD_FIRST_INO 11 | |
ac27a0ec DK |
128 | |
129 | /* | |
130 | * Maximal count of links to a file | |
131 | */ | |
f8628a14 | 132 | #define EXT4_LINK_MAX 65000 |
ac27a0ec DK |
133 | |
134 | /* | |
135 | * Macro-instructions used to manage several block sizes | |
136 | */ | |
617ba13b | 137 | #define EXT4_MIN_BLOCK_SIZE 1024 |
afc7cbca TS |
138 | #define EXT4_MAX_BLOCK_SIZE 65536 |
139 | #define EXT4_MIN_BLOCK_LOG_SIZE 10 | |
ac27a0ec | 140 | #ifdef __KERNEL__ |
617ba13b | 141 | # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) |
ac27a0ec | 142 | #else |
617ba13b | 143 | # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) |
ac27a0ec | 144 | #endif |
af5bc92d | 145 | #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) |
ac27a0ec | 146 | #ifdef __KERNEL__ |
617ba13b | 147 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) |
ac27a0ec | 148 | #else |
617ba13b | 149 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) |
ac27a0ec DK |
150 | #endif |
151 | #ifdef __KERNEL__ | |
617ba13b MC |
152 | #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) |
153 | #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) | |
154 | #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) | |
ac27a0ec | 155 | #else |
617ba13b MC |
156 | #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
157 | EXT4_GOOD_OLD_INODE_SIZE : \ | |
ac27a0ec | 158 | (s)->s_inode_size) |
617ba13b MC |
159 | #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
160 | EXT4_GOOD_OLD_FIRST_INO : \ | |
ac27a0ec DK |
161 | (s)->s_first_ino) |
162 | #endif | |
a2df2a63 | 163 | #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) |
ac27a0ec | 164 | |
ac27a0ec DK |
165 | /* |
166 | * Structure of a blocks group descriptor | |
167 | */ | |
617ba13b | 168 | struct ext4_group_desc |
ac27a0ec | 169 | { |
3a14589c | 170 | __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ |
5272f837 AK |
171 | __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ |
172 | __le32 bg_inode_table_lo; /* Inodes table block */ | |
560671a0 AK |
173 | __le16 bg_free_blocks_count_lo;/* Free blocks count */ |
174 | __le16 bg_free_inodes_count_lo;/* Free inodes count */ | |
175 | __le16 bg_used_dirs_count_lo; /* Directories count */ | |
717d50e4 AD |
176 | __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ |
177 | __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ | |
560671a0 | 178 | __le16 bg_itable_unused_lo; /* Unused inodes count */ |
717d50e4 | 179 | __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ |
8fadc143 AR |
180 | __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ |
181 | __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ | |
182 | __le32 bg_inode_table_hi; /* Inodes table block MSB */ | |
91b51a01 CL |
183 | __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ |
184 | __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ | |
185 | __le16 bg_used_dirs_count_hi; /* Directories count MSB */ | |
560671a0 | 186 | __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ |
91b51a01 | 187 | __u32 bg_reserved2[3]; |
ac27a0ec DK |
188 | }; |
189 | ||
772cb7c8 JS |
190 | /* |
191 | * Structure of a flex block group info | |
192 | */ | |
193 | ||
194 | struct flex_groups { | |
9f24e420 TT |
195 | atomic_t free_inodes; |
196 | atomic_t free_blocks; | |
7d39db14 | 197 | atomic_t used_dirs; |
772cb7c8 JS |
198 | }; |
199 | ||
717d50e4 AD |
200 | #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ |
201 | #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ | |
202 | #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ | |
203 | ||
ac27a0ec DK |
204 | /* |
205 | * Macro-instructions used to manage group descriptors | |
206 | */ | |
0d1ee42f | 207 | #define EXT4_MIN_DESC_SIZE 32 |
8fadc143 | 208 | #define EXT4_MIN_DESC_SIZE_64BIT 64 |
0d1ee42f AR |
209 | #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE |
210 | #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) | |
ac27a0ec | 211 | #ifdef __KERNEL__ |
617ba13b MC |
212 | # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) |
213 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) | |
214 | # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) | |
215 | # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) | |
ac27a0ec | 216 | #else |
617ba13b | 217 | # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) |
0d1ee42f | 218 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) |
617ba13b | 219 | # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) |
ac27a0ec DK |
220 | #endif |
221 | ||
222 | /* | |
223 | * Constants relative to the data blocks | |
224 | */ | |
617ba13b MC |
225 | #define EXT4_NDIR_BLOCKS 12 |
226 | #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS | |
227 | #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) | |
228 | #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) | |
229 | #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) | |
ac27a0ec DK |
230 | |
231 | /* | |
232 | * Inode flags | |
233 | */ | |
617ba13b MC |
234 | #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ |
235 | #define EXT4_UNRM_FL 0x00000002 /* Undelete */ | |
236 | #define EXT4_COMPR_FL 0x00000004 /* Compress file */ | |
237 | #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ | |
238 | #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ | |
239 | #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ | |
240 | #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ | |
241 | #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ | |
ac27a0ec | 242 | /* Reserved for compression usage... */ |
617ba13b MC |
243 | #define EXT4_DIRTY_FL 0x00000100 |
244 | #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ | |
245 | #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ | |
246 | #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ | |
ac27a0ec | 247 | /* End compression flags --- maybe not all used */ |
617ba13b MC |
248 | #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ |
249 | #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ | |
250 | #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ | |
251 | #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ | |
252 | #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ | |
253 | #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ | |
8180a562 | 254 | #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ |
a86c6181 | 255 | #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ |
267e4db9 | 256 | #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */ |
8180a562 | 257 | #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ |
ac27a0ec | 258 | |
a86c6181 | 259 | #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ |
4db46fc2 | 260 | #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */ |
ac27a0ec | 261 | |
8fa43a81 DG |
262 | /* Flags that should be inherited by new inodes from their parent. */ |
263 | #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ | |
264 | EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ | |
265 | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ | |
266 | EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ | |
267 | EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) | |
268 | ||
2dc6b0d4 DG |
269 | /* Flags that are appropriate for regular files (all but dir-specific ones). */ |
270 | #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) | |
271 | ||
272 | /* Flags that are appropriate for non-directories/regular files. */ | |
273 | #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) | |
274 | ||
275 | /* Mask out flags that are inappropriate for the given type of inode. */ | |
276 | static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) | |
277 | { | |
278 | if (S_ISDIR(mode)) | |
279 | return flags; | |
280 | else if (S_ISREG(mode)) | |
281 | return flags & EXT4_REG_FLMASK; | |
282 | else | |
283 | return flags & EXT4_OTHER_FLMASK; | |
284 | } | |
285 | ||
ac27a0ec DK |
286 | /* |
287 | * Inode dynamic state flags | |
288 | */ | |
617ba13b MC |
289 | #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */ |
290 | #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */ | |
291 | #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */ | |
6dd4ee7c | 292 | #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ |
7d8f9f7d | 293 | #define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */ |
ac27a0ec DK |
294 | |
295 | /* Used to pass group descriptor data when online resize is done */ | |
617ba13b | 296 | struct ext4_new_group_input { |
8c55e204 DK |
297 | __u32 group; /* Group number for this data */ |
298 | __u64 block_bitmap; /* Absolute block number of block bitmap */ | |
299 | __u64 inode_bitmap; /* Absolute block number of inode bitmap */ | |
300 | __u64 inode_table; /* Absolute block number of inode table start */ | |
301 | __u32 blocks_count; /* Total number of blocks in this group */ | |
302 | __u16 reserved_blocks; /* Number of reserved blocks in this group */ | |
ac27a0ec DK |
303 | __u16 unused; |
304 | }; | |
305 | ||
617ba13b MC |
306 | /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ |
307 | struct ext4_new_group_data { | |
ac27a0ec | 308 | __u32 group; |
bd81d8ee LV |
309 | __u64 block_bitmap; |
310 | __u64 inode_bitmap; | |
311 | __u64 inode_table; | |
ac27a0ec DK |
312 | __u32 blocks_count; |
313 | __u16 reserved_blocks; | |
314 | __u16 unused; | |
315 | __u32 free_blocks_count; | |
316 | }; | |
317 | ||
a2df2a63 | 318 | /* |
c2177057 | 319 | * Flags used by ext4_get_blocks() |
a2df2a63 | 320 | */ |
c2177057 TT |
321 | /* Allocate any needed blocks and/or convert an unitialized |
322 | extent to be an initialized ext4 */ | |
2ac3b6e0 | 323 | #define EXT4_GET_BLOCKS_CREATE 0x0001 |
c2177057 | 324 | /* Request the creation of an unitialized extent */ |
2ac3b6e0 | 325 | #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 |
c2177057 TT |
326 | #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ |
327 | EXT4_GET_BLOCKS_CREATE) | |
c2177057 | 328 | /* Caller is from the delayed allocation writeout path, |
2ac3b6e0 TT |
329 | so set the magic i_delalloc_reserve_flag after taking the |
330 | inode allocation semaphore for */ | |
03f5d8bc | 331 | #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 |
2ac3b6e0 TT |
332 | /* Call ext4_da_update_reserve_space() after successfully |
333 | allocating the blocks */ | |
03f5d8bc | 334 | #define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE 0x0008 |
2ac3b6e0 | 335 | |
ac27a0ec DK |
336 | |
337 | /* | |
338 | * ioctl commands | |
339 | */ | |
617ba13b MC |
340 | #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS |
341 | #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS | |
342 | #define EXT4_IOC_GETVERSION _IOR('f', 3, long) | |
343 | #define EXT4_IOC_SETVERSION _IOW('f', 4, long) | |
617ba13b MC |
344 | #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION |
345 | #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION | |
e23291b9 | 346 | #ifdef CONFIG_JBD2_DEBUG |
617ba13b | 347 | #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) |
ac27a0ec | 348 | #endif |
617ba13b MC |
349 | #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) |
350 | #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) | |
8eea80d5 TT |
351 | #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) |
352 | #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) | |
353 | #define EXT4_IOC_MIGRATE _IO('f', 9) | |
ccd2506b | 354 | /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ |
8eea80d5 | 355 | /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ |
ccd2506b | 356 | #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) |
748de673 | 357 | #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) |
ac27a0ec DK |
358 | |
359 | /* | |
360 | * ioctl commands in 32 bit emulation | |
361 | */ | |
617ba13b MC |
362 | #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS |
363 | #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS | |
364 | #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) | |
365 | #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) | |
366 | #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) | |
367 | #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) | |
368 | #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) | |
e23291b9 | 369 | #ifdef CONFIG_JBD2_DEBUG |
617ba13b | 370 | #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) |
ac27a0ec | 371 | #endif |
617ba13b MC |
372 | #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION |
373 | #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION | |
ac27a0ec DK |
374 | |
375 | ||
376 | /* | |
377 | * Mount options | |
378 | */ | |
617ba13b | 379 | struct ext4_mount_options { |
ac27a0ec DK |
380 | unsigned long s_mount_opt; |
381 | uid_t s_resuid; | |
382 | gid_t s_resgid; | |
383 | unsigned long s_commit_interval; | |
30773840 | 384 | u32 s_min_batch_time, s_max_batch_time; |
ac27a0ec DK |
385 | #ifdef CONFIG_QUOTA |
386 | int s_jquota_fmt; | |
387 | char *s_qf_names[MAXQUOTAS]; | |
388 | #endif | |
389 | }; | |
390 | ||
391 | /* | |
392 | * Structure of an inode on the disk | |
393 | */ | |
617ba13b | 394 | struct ext4_inode { |
ac27a0ec DK |
395 | __le16 i_mode; /* File mode */ |
396 | __le16 i_uid; /* Low 16 bits of Owner Uid */ | |
a48380f7 | 397 | __le32 i_size_lo; /* Size in bytes */ |
ac27a0ec | 398 | __le32 i_atime; /* Access time */ |
ef7f3835 | 399 | __le32 i_ctime; /* Inode Change time */ |
ac27a0ec DK |
400 | __le32 i_mtime; /* Modification time */ |
401 | __le32 i_dtime; /* Deletion Time */ | |
402 | __le16 i_gid; /* Low 16 bits of Group Id */ | |
403 | __le16 i_links_count; /* Links count */ | |
0fc1b451 | 404 | __le32 i_blocks_lo; /* Blocks count */ |
ac27a0ec DK |
405 | __le32 i_flags; /* File flags */ |
406 | union { | |
407 | struct { | |
25ec56b5 | 408 | __le32 l_i_version; |
ac27a0ec DK |
409 | } linux1; |
410 | struct { | |
411 | __u32 h_i_translator; | |
412 | } hurd1; | |
413 | struct { | |
414 | __u32 m_i_reserved1; | |
415 | } masix1; | |
416 | } osd1; /* OS dependent 1 */ | |
617ba13b | 417 | __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ |
ac27a0ec | 418 | __le32 i_generation; /* File version (for NFS) */ |
7973c0c1 | 419 | __le32 i_file_acl_lo; /* File ACL */ |
a48380f7 | 420 | __le32 i_size_high; |
f077d0d7 | 421 | __le32 i_obso_faddr; /* Obsoleted fragment address */ |
ac27a0ec DK |
422 | union { |
423 | struct { | |
0fc1b451 | 424 | __le16 l_i_blocks_high; /* were l_i_reserved1 */ |
a1ddeb7e | 425 | __le16 l_i_file_acl_high; |
8c55e204 | 426 | __le16 l_i_uid_high; /* these 2 fields */ |
ac27a0ec DK |
427 | __le16 l_i_gid_high; /* were reserved2[0] */ |
428 | __u32 l_i_reserved2; | |
429 | } linux2; | |
430 | struct { | |
f077d0d7 | 431 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
ac27a0ec DK |
432 | __u16 h_i_mode_high; |
433 | __u16 h_i_uid_high; | |
434 | __u16 h_i_gid_high; | |
435 | __u32 h_i_author; | |
436 | } hurd2; | |
437 | struct { | |
f077d0d7 | 438 | __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ |
a1ddeb7e | 439 | __le16 m_i_file_acl_high; |
ac27a0ec DK |
440 | __u32 m_i_reserved2[2]; |
441 | } masix2; | |
442 | } osd2; /* OS dependent 2 */ | |
443 | __le16 i_extra_isize; | |
444 | __le16 i_pad1; | |
ef7f3835 KS |
445 | __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ |
446 | __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ | |
447 | __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ | |
448 | __le32 i_crtime; /* File Creation time */ | |
449 | __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ | |
25ec56b5 | 450 | __le32 i_version_hi; /* high 32 bits for 64-bit version */ |
ac27a0ec DK |
451 | }; |
452 | ||
748de673 AF |
453 | struct move_extent { |
454 | __u32 reserved; /* should be zero */ | |
455 | __u32 donor_fd; /* donor file descriptor */ | |
456 | __u64 orig_start; /* logical start offset in block for orig */ | |
457 | __u64 donor_start; /* logical start offset in block for donor */ | |
458 | __u64 len; /* block length to be moved */ | |
459 | __u64 moved_len; /* moved block length */ | |
460 | }; | |
461 | #define MAX_DEFRAG_SIZE ((1UL<<31) - 1) | |
ac27a0ec | 462 | |
ef7f3835 KS |
463 | #define EXT4_EPOCH_BITS 2 |
464 | #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) | |
465 | #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) | |
466 | ||
467 | /* | |
468 | * Extended fields will fit into an inode if the filesystem was formatted | |
469 | * with large inodes (-I 256 or larger) and there are not currently any EAs | |
470 | * consuming all of the available space. For new inodes we always reserve | |
471 | * enough space for the kernel's known extended fields, but for inodes | |
472 | * created with an old kernel this might not have been the case. None of | |
473 | * the extended inode fields is critical for correct filesystem operation. | |
474 | * This macro checks if a certain field fits in the inode. Note that | |
475 | * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize | |
476 | */ | |
477 | #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ | |
478 | ((offsetof(typeof(*ext4_inode), field) + \ | |
479 | sizeof((ext4_inode)->field)) \ | |
480 | <= (EXT4_GOOD_OLD_INODE_SIZE + \ | |
481 | (einode)->i_extra_isize)) \ | |
482 | ||
483 | static inline __le32 ext4_encode_extra_time(struct timespec *time) | |
484 | { | |
485 | return cpu_to_le32((sizeof(time->tv_sec) > 4 ? | |
486 | time->tv_sec >> 32 : 0) | | |
487 | ((time->tv_nsec << 2) & EXT4_NSEC_MASK)); | |
488 | } | |
489 | ||
490 | static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) | |
491 | { | |
492 | if (sizeof(time->tv_sec) > 4) | |
493 | time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) | |
494 | << 32; | |
495 | time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2; | |
496 | } | |
497 | ||
498 | #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ | |
499 | do { \ | |
500 | (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ | |
501 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
502 | (raw_inode)->xtime ## _extra = \ | |
503 | ext4_encode_extra_time(&(inode)->xtime); \ | |
504 | } while (0) | |
505 | ||
506 | #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ | |
507 | do { \ | |
508 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
509 | (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ | |
510 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | |
511 | (raw_inode)->xtime ## _extra = \ | |
512 | ext4_encode_extra_time(&(einode)->xtime); \ | |
513 | } while (0) | |
514 | ||
515 | #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ | |
516 | do { \ | |
517 | (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ | |
518 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ | |
519 | ext4_decode_extra_time(&(inode)->xtime, \ | |
520 | raw_inode->xtime ## _extra); \ | |
521 | } while (0) | |
522 | ||
523 | #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ | |
524 | do { \ | |
525 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ | |
526 | (einode)->xtime.tv_sec = \ | |
527 | (signed)le32_to_cpu((raw_inode)->xtime); \ | |
528 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ | |
529 | ext4_decode_extra_time(&(einode)->xtime, \ | |
530 | raw_inode->xtime ## _extra); \ | |
531 | } while (0) | |
532 | ||
25ec56b5 JNC |
533 | #define i_disk_version osd1.linux1.l_i_version |
534 | ||
ac27a0ec DK |
535 | #if defined(__KERNEL__) || defined(__linux__) |
536 | #define i_reserved1 osd1.linux1.l_i_reserved1 | |
a1ddeb7e | 537 | #define i_file_acl_high osd2.linux2.l_i_file_acl_high |
0fc1b451 | 538 | #define i_blocks_high osd2.linux2.l_i_blocks_high |
ac27a0ec DK |
539 | #define i_uid_low i_uid |
540 | #define i_gid_low i_gid | |
541 | #define i_uid_high osd2.linux2.l_i_uid_high | |
542 | #define i_gid_high osd2.linux2.l_i_gid_high | |
543 | #define i_reserved2 osd2.linux2.l_i_reserved2 | |
544 | ||
545 | #elif defined(__GNU__) | |
546 | ||
547 | #define i_translator osd1.hurd1.h_i_translator | |
ac27a0ec DK |
548 | #define i_uid_high osd2.hurd2.h_i_uid_high |
549 | #define i_gid_high osd2.hurd2.h_i_gid_high | |
550 | #define i_author osd2.hurd2.h_i_author | |
551 | ||
552 | #elif defined(__masix__) | |
553 | ||
554 | #define i_reserved1 osd1.masix1.m_i_reserved1 | |
a1ddeb7e | 555 | #define i_file_acl_high osd2.masix2.m_i_file_acl_high |
ac27a0ec DK |
556 | #define i_reserved2 osd2.masix2.m_i_reserved2 |
557 | ||
558 | #endif /* defined(__KERNEL__) || defined(__linux__) */ | |
559 | ||
d444c3c3 TT |
560 | /* |
561 | * storage for cached extent | |
562 | */ | |
563 | struct ext4_ext_cache { | |
564 | ext4_fsblk_t ec_start; | |
565 | ext4_lblk_t ec_block; | |
566 | __u32 ec_len; /* must be 32bit to return holes */ | |
567 | __u32 ec_type; | |
568 | }; | |
569 | ||
570 | /* | |
571 | * fourth extended file system inode data in memory | |
572 | */ | |
573 | struct ext4_inode_info { | |
574 | __le32 i_data[15]; /* unconverted */ | |
575 | __u32 i_flags; | |
576 | ext4_fsblk_t i_file_acl; | |
577 | __u32 i_dtime; | |
578 | ||
579 | /* | |
580 | * i_block_group is the number of the block group which contains | |
581 | * this file's inode. Constant across the lifetime of the inode, | |
582 | * it is ued for making block allocation decisions - we try to | |
583 | * place a file's data blocks near its inode block, and new inodes | |
584 | * near to their parent directory's inode. | |
585 | */ | |
586 | ext4_group_t i_block_group; | |
587 | __u32 i_state; /* Dynamic state flags for ext4 */ | |
588 | ||
589 | ext4_lblk_t i_dir_start_lookup; | |
590 | #ifdef CONFIG_EXT4_FS_XATTR | |
591 | /* | |
592 | * Extended attributes can be read independently of the main file | |
593 | * data. Taking i_mutex even when reading would cause contention | |
594 | * between readers of EAs and writers of regular file data, so | |
595 | * instead we synchronize on xattr_sem when reading or changing | |
596 | * EAs. | |
597 | */ | |
598 | struct rw_semaphore xattr_sem; | |
599 | #endif | |
d444c3c3 TT |
600 | |
601 | struct list_head i_orphan; /* unlinked but open inodes */ | |
602 | ||
603 | /* | |
604 | * i_disksize keeps track of what the inode size is ON DISK, not | |
605 | * in memory. During truncate, i_size is set to the new size by | |
606 | * the VFS prior to calling ext4_truncate(), but the filesystem won't | |
607 | * set i_disksize to 0 until the truncate is actually under way. | |
608 | * | |
609 | * The intent is that i_disksize always represents the blocks which | |
610 | * are used by this file. This allows recovery to restart truncate | |
611 | * on orphans if we crash during truncate. We actually write i_disksize | |
612 | * into the on-disk inode when writing inodes out, instead of i_size. | |
613 | * | |
614 | * The only time when i_disksize and i_size may be different is when | |
615 | * a truncate is in progress. The only things which change i_disksize | |
616 | * are ext4_get_block (growth) and ext4_truncate (shrinkth). | |
617 | */ | |
618 | loff_t i_disksize; | |
619 | ||
620 | /* | |
621 | * i_data_sem is for serialising ext4_truncate() against | |
622 | * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's | |
623 | * data tree are chopped off during truncate. We can't do that in | |
624 | * ext4 because whenever we perform intermediate commits during | |
625 | * truncate, the inode and all the metadata blocks *must* be in a | |
626 | * consistent state which allows truncation of the orphans to restart | |
627 | * during recovery. Hence we must fix the get_block-vs-truncate race | |
628 | * by other means, so we have i_data_sem. | |
629 | */ | |
630 | struct rw_semaphore i_data_sem; | |
631 | struct inode vfs_inode; | |
632 | struct jbd2_inode jinode; | |
633 | ||
634 | struct ext4_ext_cache i_cached_extent; | |
635 | /* | |
636 | * File creation time. Its function is same as that of | |
637 | * struct timespec i_{a,c,m}time in the generic inode. | |
638 | */ | |
639 | struct timespec i_crtime; | |
640 | ||
641 | /* mballoc */ | |
642 | struct list_head i_prealloc_list; | |
643 | spinlock_t i_prealloc_lock; | |
644 | ||
645 | /* ialloc */ | |
646 | ext4_group_t i_last_alloc_group; | |
647 | ||
648 | /* allocation reservation info for delalloc */ | |
649 | unsigned int i_reserved_data_blocks; | |
650 | unsigned int i_reserved_meta_blocks; | |
651 | unsigned int i_allocated_meta_blocks; | |
652 | unsigned short i_delalloc_reserved_flag; | |
653 | ||
654 | /* on-disk additional length */ | |
655 | __u16 i_extra_isize; | |
656 | ||
657 | spinlock_t i_block_reservation_lock; | |
658 | }; | |
659 | ||
ac27a0ec DK |
660 | /* |
661 | * File system states | |
662 | */ | |
617ba13b MC |
663 | #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ |
664 | #define EXT4_ERROR_FS 0x0002 /* Errors detected */ | |
665 | #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ | |
ac27a0ec | 666 | |
469108ff TT |
667 | /* |
668 | * Misc. filesystem flags | |
669 | */ | |
670 | #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ | |
671 | #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ | |
672 | #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ | |
673 | ||
ac27a0ec DK |
674 | /* |
675 | * Mount flags | |
676 | */ | |
617ba13b MC |
677 | #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ |
678 | #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ | |
679 | #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ | |
680 | #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ | |
681 | #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ | |
682 | #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ | |
683 | #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ | |
684 | #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ | |
617ba13b MC |
685 | #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ |
686 | #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ | |
687 | #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ | |
688 | #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ | |
689 | #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ | |
690 | #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ | |
691 | #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ | |
692 | #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ | |
afd4672d | 693 | #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ |
617ba13b MC |
694 | #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ |
695 | #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ | |
696 | #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ | |
697 | #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ | |
698 | #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ | |
818d276c GS |
699 | #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ |
700 | #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ | |
25ec56b5 | 701 | #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ |
64769240 | 702 | #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ |
5bf5683a | 703 | #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ |
6fd058f7 | 704 | #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ |
5bf5683a | 705 | |
617ba13b MC |
706 | #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt |
707 | #define set_opt(o, opt) o |= EXT4_MOUNT_##opt | |
708 | #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ | |
709 | EXT4_MOUNT_##opt) | |
ac27a0ec | 710 | |
617ba13b MC |
711 | #define ext4_set_bit ext2_set_bit |
712 | #define ext4_set_bit_atomic ext2_set_bit_atomic | |
713 | #define ext4_clear_bit ext2_clear_bit | |
714 | #define ext4_clear_bit_atomic ext2_clear_bit_atomic | |
715 | #define ext4_test_bit ext2_test_bit | |
716 | #define ext4_find_first_zero_bit ext2_find_first_zero_bit | |
717 | #define ext4_find_next_zero_bit ext2_find_next_zero_bit | |
aa02ad67 | 718 | #define ext4_find_next_bit ext2_find_next_bit |
ac27a0ec DK |
719 | |
720 | /* | |
721 | * Maximal mount counts between two filesystem checks | |
722 | */ | |
617ba13b MC |
723 | #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ |
724 | #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ | |
ac27a0ec DK |
725 | |
726 | /* | |
727 | * Behaviour when detecting errors | |
728 | */ | |
617ba13b MC |
729 | #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ |
730 | #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ | |
731 | #define EXT4_ERRORS_PANIC 3 /* Panic */ | |
732 | #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE | |
ac27a0ec DK |
733 | |
734 | /* | |
735 | * Structure of the super block | |
736 | */ | |
617ba13b | 737 | struct ext4_super_block { |
ac27a0ec | 738 | /*00*/ __le32 s_inodes_count; /* Inodes count */ |
6bc9feff | 739 | __le32 s_blocks_count_lo; /* Blocks count */ |
308ba3ec AK |
740 | __le32 s_r_blocks_count_lo; /* Reserved blocks count */ |
741 | __le32 s_free_blocks_count_lo; /* Free blocks count */ | |
ac27a0ec DK |
742 | /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ |
743 | __le32 s_first_data_block; /* First Data Block */ | |
744 | __le32 s_log_block_size; /* Block size */ | |
f077d0d7 | 745 | __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ |
ac27a0ec | 746 | /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ |
f077d0d7 | 747 | __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ |
ac27a0ec DK |
748 | __le32 s_inodes_per_group; /* # Inodes per group */ |
749 | __le32 s_mtime; /* Mount time */ | |
750 | /*30*/ __le32 s_wtime; /* Write time */ | |
751 | __le16 s_mnt_count; /* Mount count */ | |
752 | __le16 s_max_mnt_count; /* Maximal mount count */ | |
753 | __le16 s_magic; /* Magic signature */ | |
754 | __le16 s_state; /* File system state */ | |
755 | __le16 s_errors; /* Behaviour when detecting errors */ | |
756 | __le16 s_minor_rev_level; /* minor revision level */ | |
757 | /*40*/ __le32 s_lastcheck; /* time of last check */ | |
758 | __le32 s_checkinterval; /* max. time between checks */ | |
759 | __le32 s_creator_os; /* OS */ | |
760 | __le32 s_rev_level; /* Revision level */ | |
761 | /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ | |
762 | __le16 s_def_resgid; /* Default gid for reserved blocks */ | |
763 | /* | |
617ba13b | 764 | * These fields are for EXT4_DYNAMIC_REV superblocks only. |
ac27a0ec DK |
765 | * |
766 | * Note: the difference between the compatible feature set and | |
767 | * the incompatible feature set is that if there is a bit set | |
768 | * in the incompatible feature set that the kernel doesn't | |
769 | * know about, it should refuse to mount the filesystem. | |
770 | * | |
771 | * e2fsck's requirements are more strict; if it doesn't know | |
772 | * about a feature in either the compatible or incompatible | |
773 | * feature set, it must abort and not try to meddle with | |
774 | * things it doesn't understand... | |
775 | */ | |
776 | __le32 s_first_ino; /* First non-reserved inode */ | |
0d1ee42f | 777 | __le16 s_inode_size; /* size of inode structure */ |
ac27a0ec DK |
778 | __le16 s_block_group_nr; /* block group # of this superblock */ |
779 | __le32 s_feature_compat; /* compatible feature set */ | |
780 | /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ | |
781 | __le32 s_feature_ro_compat; /* readonly-compatible feature set */ | |
782 | /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ | |
783 | /*78*/ char s_volume_name[16]; /* volume name */ | |
784 | /*88*/ char s_last_mounted[64]; /* directory where last mounted */ | |
785 | /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ | |
786 | /* | |
787 | * Performance hints. Directory preallocation should only | |
617ba13b | 788 | * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. |
ac27a0ec DK |
789 | */ |
790 | __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ | |
791 | __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ | |
792 | __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ | |
793 | /* | |
617ba13b | 794 | * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. |
ac27a0ec DK |
795 | */ |
796 | /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ | |
797 | /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ | |
798 | __le32 s_journal_dev; /* device number of journal file */ | |
799 | __le32 s_last_orphan; /* start of list of inodes to delete */ | |
800 | __le32 s_hash_seed[4]; /* HTREE hash seed */ | |
801 | __u8 s_def_hash_version; /* Default hash version to use */ | |
802 | __u8 s_reserved_char_pad; | |
0d1ee42f | 803 | __le16 s_desc_size; /* size of group descriptor */ |
bd81d8ee | 804 | /*100*/ __le32 s_default_mount_opts; |
ac27a0ec | 805 | __le32 s_first_meta_bg; /* First metablock block group */ |
bd81d8ee LV |
806 | __le32 s_mkfs_time; /* When the filesystem was created */ |
807 | __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ | |
808 | /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ | |
809 | /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ | |
810 | __le32 s_r_blocks_count_hi; /* Reserved blocks count */ | |
811 | __le32 s_free_blocks_count_hi; /* Free blocks count */ | |
c1bddad9 AK |
812 | __le16 s_min_extra_isize; /* All inodes have at least # bytes */ |
813 | __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ | |
814 | __le32 s_flags; /* Miscellaneous flags */ | |
815 | __le16 s_raid_stride; /* RAID stride */ | |
816 | __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ | |
817 | __le64 s_mmp_block; /* Block for multi-mount protection */ | |
818 | __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ | |
772cb7c8 JS |
819 | __u8 s_log_groups_per_flex; /* FLEX_BG group size */ |
820 | __u8 s_reserved_char_pad2; | |
821 | __le16 s_reserved_pad; | |
afc32f7e TT |
822 | __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ |
823 | __u32 s_reserved[160]; /* Padding to the end of the block */ | |
ac27a0ec DK |
824 | }; |
825 | ||
826 | #ifdef __KERNEL__ | |
bc0b0d6d TT |
827 | |
828 | /* | |
4ab2f15b | 829 | * run-time mount flags |
bc0b0d6d TT |
830 | */ |
831 | #define EXT4_MF_MNTDIR_SAMPLED 0x0001 | |
4ab2f15b | 832 | #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ |
bc0b0d6d | 833 | |
ca0faba0 TT |
834 | /* |
835 | * fourth extended-fs super-block data in memory | |
836 | */ | |
837 | struct ext4_sb_info { | |
838 | unsigned long s_desc_size; /* Size of a group descriptor in bytes */ | |
839 | unsigned long s_inodes_per_block;/* Number of inodes per block */ | |
840 | unsigned long s_blocks_per_group;/* Number of blocks in a group */ | |
841 | unsigned long s_inodes_per_group;/* Number of inodes in a group */ | |
842 | unsigned long s_itb_per_group; /* Number of inode table blocks per group */ | |
843 | unsigned long s_gdb_count; /* Number of group descriptor blocks */ | |
844 | unsigned long s_desc_per_block; /* Number of group descriptors per block */ | |
845 | ext4_group_t s_groups_count; /* Number of groups in the fs */ | |
846 | unsigned long s_overhead_last; /* Last calculated overhead */ | |
847 | unsigned long s_blocks_last; /* Last seen block count */ | |
848 | loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ | |
849 | struct buffer_head * s_sbh; /* Buffer containing the super block */ | |
850 | struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ | |
851 | struct buffer_head **s_group_desc; | |
7f4520cc | 852 | unsigned int s_mount_opt; |
bc0b0d6d | 853 | unsigned int s_mount_flags; |
ca0faba0 TT |
854 | ext4_fsblk_t s_sb_block; |
855 | uid_t s_resuid; | |
856 | gid_t s_resgid; | |
857 | unsigned short s_mount_state; | |
858 | unsigned short s_pad; | |
859 | int s_addr_per_block_bits; | |
860 | int s_desc_per_block_bits; | |
861 | int s_inode_size; | |
862 | int s_first_ino; | |
863 | unsigned int s_inode_readahead_blks; | |
11013911 | 864 | unsigned int s_inode_goal; |
ca0faba0 TT |
865 | spinlock_t s_next_gen_lock; |
866 | u32 s_next_generation; | |
867 | u32 s_hash_seed[4]; | |
868 | int s_def_hash_version; | |
869 | int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ | |
870 | struct percpu_counter s_freeblocks_counter; | |
871 | struct percpu_counter s_freeinodes_counter; | |
872 | struct percpu_counter s_dirs_counter; | |
873 | struct percpu_counter s_dirtyblocks_counter; | |
874 | struct blockgroup_lock *s_blockgroup_lock; | |
875 | struct proc_dir_entry *s_proc; | |
876 | struct kobject s_kobj; | |
877 | struct completion s_kobj_unregister; | |
878 | ||
879 | /* Journaling */ | |
880 | struct inode *s_journal_inode; | |
881 | struct journal_s *s_journal; | |
882 | struct list_head s_orphan; | |
883 | struct mutex s_orphan_lock; | |
884 | struct mutex s_resize_lock; | |
885 | unsigned long s_commit_interval; | |
886 | u32 s_max_batch_time; | |
887 | u32 s_min_batch_time; | |
888 | struct block_device *journal_bdev; | |
889 | #ifdef CONFIG_JBD2_DEBUG | |
890 | struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */ | |
891 | wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */ | |
892 | #endif | |
893 | #ifdef CONFIG_QUOTA | |
894 | char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ | |
895 | int s_jquota_fmt; /* Format of quota to use */ | |
896 | #endif | |
897 | unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ | |
6fd058f7 | 898 | struct rb_root system_blks; |
ca0faba0 TT |
899 | |
900 | #ifdef EXTENTS_STATS | |
901 | /* ext4 extents stats */ | |
902 | unsigned long s_ext_min; | |
903 | unsigned long s_ext_max; | |
904 | unsigned long s_depth_max; | |
905 | spinlock_t s_ext_stats_lock; | |
906 | unsigned long s_ext_blocks; | |
907 | unsigned long s_ext_extents; | |
908 | #endif | |
909 | ||
910 | /* for buddy allocator */ | |
911 | struct ext4_group_info ***s_group_info; | |
912 | struct inode *s_buddy_cache; | |
913 | long s_blocks_reserved; | |
914 | spinlock_t s_reserve_lock; | |
915 | spinlock_t s_md_lock; | |
916 | tid_t s_last_transaction; | |
917 | unsigned short *s_mb_offsets; | |
918 | unsigned int *s_mb_maxs; | |
919 | ||
920 | /* tunables */ | |
921 | unsigned long s_stripe; | |
922 | unsigned int s_mb_stream_request; | |
923 | unsigned int s_mb_max_to_scan; | |
924 | unsigned int s_mb_min_to_scan; | |
925 | unsigned int s_mb_stats; | |
926 | unsigned int s_mb_order2_reqs; | |
927 | unsigned int s_mb_group_prealloc; | |
928 | /* where last allocation was done - for stream allocation */ | |
929 | unsigned long s_mb_last_group; | |
930 | unsigned long s_mb_last_start; | |
931 | ||
932 | /* history to debug policy */ | |
933 | struct ext4_mb_history *s_mb_history; | |
934 | int s_mb_history_cur; | |
935 | int s_mb_history_max; | |
936 | int s_mb_history_num; | |
937 | spinlock_t s_mb_history_lock; | |
938 | int s_mb_history_filter; | |
939 | ||
940 | /* stats for buddy allocator */ | |
941 | spinlock_t s_mb_pa_lock; | |
942 | atomic_t s_bal_reqs; /* number of reqs with len > 1 */ | |
943 | atomic_t s_bal_success; /* we found long enough chunks */ | |
944 | atomic_t s_bal_allocated; /* in blocks */ | |
945 | atomic_t s_bal_ex_scanned; /* total extents scanned */ | |
946 | atomic_t s_bal_goals; /* goal hits */ | |
947 | atomic_t s_bal_breaks; /* too long searches */ | |
948 | atomic_t s_bal_2orders; /* 2^order hits */ | |
949 | spinlock_t s_bal_lock; | |
950 | unsigned long s_mb_buddies_generated; | |
951 | unsigned long long s_mb_generation_time; | |
952 | atomic_t s_mb_lost_chunks; | |
953 | atomic_t s_mb_preallocated; | |
954 | atomic_t s_mb_discarded; | |
955 | ||
956 | /* locality groups */ | |
957 | struct ext4_locality_group *s_locality_groups; | |
958 | ||
959 | /* for write statistics */ | |
960 | unsigned long s_sectors_written_start; | |
961 | u64 s_kbytes_written; | |
962 | ||
963 | unsigned int s_log_groups_per_flex; | |
964 | struct flex_groups *s_flex_groups; | |
965 | }; | |
966 | ||
af5bc92d | 967 | static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) |
ac27a0ec DK |
968 | { |
969 | return sb->s_fs_info; | |
970 | } | |
617ba13b | 971 | static inline struct ext4_inode_info *EXT4_I(struct inode *inode) |
ac27a0ec | 972 | { |
617ba13b | 973 | return container_of(inode, struct ext4_inode_info, vfs_inode); |
ac27a0ec DK |
974 | } |
975 | ||
ef7f3835 KS |
976 | static inline struct timespec ext4_current_time(struct inode *inode) |
977 | { | |
978 | return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? | |
979 | current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; | |
980 | } | |
981 | ||
617ba13b | 982 | static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) |
ac27a0ec | 983 | { |
617ba13b MC |
984 | return ino == EXT4_ROOT_INO || |
985 | ino == EXT4_JOURNAL_INO || | |
986 | ino == EXT4_RESIZE_INO || | |
987 | (ino >= EXT4_FIRST_INO(sb) && | |
988 | ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); | |
ac27a0ec DK |
989 | } |
990 | #else | |
617ba13b | 991 | /* Assume that user mode programs are passing in an ext4fs superblock, not |
ac27a0ec DK |
992 | * a kernel struct super_block. This will allow us to call the feature-test |
993 | * macros from user land. */ | |
617ba13b | 994 | #define EXT4_SB(sb) (sb) |
ac27a0ec DK |
995 | #endif |
996 | ||
617ba13b | 997 | #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime |
ac27a0ec DK |
998 | |
999 | /* | |
1000 | * Codes for operating systems | |
1001 | */ | |
617ba13b MC |
1002 | #define EXT4_OS_LINUX 0 |
1003 | #define EXT4_OS_HURD 1 | |
1004 | #define EXT4_OS_MASIX 2 | |
1005 | #define EXT4_OS_FREEBSD 3 | |
1006 | #define EXT4_OS_LITES 4 | |
ac27a0ec DK |
1007 | |
1008 | /* | |
1009 | * Revision levels | |
1010 | */ | |
617ba13b MC |
1011 | #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ |
1012 | #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ | |
ac27a0ec | 1013 | |
617ba13b MC |
1014 | #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV |
1015 | #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV | |
ac27a0ec | 1016 | |
617ba13b | 1017 | #define EXT4_GOOD_OLD_INODE_SIZE 128 |
ac27a0ec DK |
1018 | |
1019 | /* | |
1020 | * Feature set definitions | |
1021 | */ | |
1022 | ||
617ba13b | 1023 | #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ |
3a06d778 | 1024 | ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) |
617ba13b | 1025 | #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ |
3a06d778 | 1026 | ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) |
617ba13b | 1027 | #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ |
3a06d778 | 1028 | ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) |
617ba13b MC |
1029 | #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ |
1030 | EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) | |
1031 | #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ | |
1032 | EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) | |
1033 | #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ | |
1034 | EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) | |
1035 | #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ | |
1036 | EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) | |
1037 | #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ | |
1038 | EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) | |
1039 | #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ | |
1040 | EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) | |
1041 | ||
1042 | #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 | |
1043 | #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 | |
1044 | #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 | |
1045 | #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 | |
1046 | #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 | |
1047 | #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 | |
1048 | ||
1049 | #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 | |
1050 | #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 | |
1051 | #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 | |
0fc1b451 | 1052 | #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 |
717d50e4 | 1053 | #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 |
f8628a14 | 1054 | #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 |
ef7f3835 | 1055 | #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 |
617ba13b MC |
1056 | |
1057 | #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 | |
1058 | #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 | |
1059 | #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ | |
1060 | #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ | |
1061 | #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 | |
a86c6181 | 1062 | #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ |
bd81d8ee | 1063 | #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 |
0fc1b451 | 1064 | #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 |
ce421581 | 1065 | #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 |
617ba13b MC |
1066 | |
1067 | #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR | |
1068 | #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ | |
1069 | EXT4_FEATURE_INCOMPAT_RECOVER| \ | |
a86c6181 | 1070 | EXT4_FEATURE_INCOMPAT_META_BG| \ |
bd81d8ee | 1071 | EXT4_FEATURE_INCOMPAT_EXTENTS| \ |
ce421581 JS |
1072 | EXT4_FEATURE_INCOMPAT_64BIT| \ |
1073 | EXT4_FEATURE_INCOMPAT_FLEX_BG) | |
617ba13b MC |
1074 | #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
1075 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ | |
717d50e4 | 1076 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ |
f8628a14 | 1077 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ |
ef7f3835 | 1078 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ |
0fc1b451 AK |
1079 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ |
1080 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE) | |
ac27a0ec DK |
1081 | |
1082 | /* | |
1083 | * Default values for user and/or group using reserved blocks | |
1084 | */ | |
617ba13b MC |
1085 | #define EXT4_DEF_RESUID 0 |
1086 | #define EXT4_DEF_RESGID 0 | |
ac27a0ec | 1087 | |
240799cd TT |
1088 | #define EXT4_DEF_INODE_READAHEAD_BLKS 32 |
1089 | ||
ac27a0ec DK |
1090 | /* |
1091 | * Default mount options | |
1092 | */ | |
617ba13b MC |
1093 | #define EXT4_DEFM_DEBUG 0x0001 |
1094 | #define EXT4_DEFM_BSDGROUPS 0x0002 | |
1095 | #define EXT4_DEFM_XATTR_USER 0x0004 | |
1096 | #define EXT4_DEFM_ACL 0x0008 | |
1097 | #define EXT4_DEFM_UID16 0x0010 | |
1098 | #define EXT4_DEFM_JMODE 0x0060 | |
1099 | #define EXT4_DEFM_JMODE_DATA 0x0020 | |
1100 | #define EXT4_DEFM_JMODE_ORDERED 0x0040 | |
1101 | #define EXT4_DEFM_JMODE_WBACK 0x0060 | |
ac27a0ec | 1102 | |
30773840 TT |
1103 | /* |
1104 | * Default journal batch times | |
1105 | */ | |
1106 | #define EXT4_DEF_MIN_BATCH_TIME 0 | |
1107 | #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ | |
1108 | ||
a4912123 TT |
1109 | /* |
1110 | * Minimum number of groups in a flexgroup before we separate out | |
1111 | * directories into the first block group of a flexgroup | |
1112 | */ | |
1113 | #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 | |
1114 | ||
ac27a0ec DK |
1115 | /* |
1116 | * Structure of a directory entry | |
1117 | */ | |
617ba13b | 1118 | #define EXT4_NAME_LEN 255 |
ac27a0ec | 1119 | |
617ba13b | 1120 | struct ext4_dir_entry { |
ac27a0ec DK |
1121 | __le32 inode; /* Inode number */ |
1122 | __le16 rec_len; /* Directory entry length */ | |
1123 | __le16 name_len; /* Name length */ | |
617ba13b | 1124 | char name[EXT4_NAME_LEN]; /* File name */ |
ac27a0ec DK |
1125 | }; |
1126 | ||
1127 | /* | |
617ba13b | 1128 | * The new version of the directory entry. Since EXT4 structures are |
ac27a0ec DK |
1129 | * stored in intel byte order, and the name_len field could never be |
1130 | * bigger than 255 chars, it's safe to reclaim the extra byte for the | |
1131 | * file_type field. | |
1132 | */ | |
617ba13b | 1133 | struct ext4_dir_entry_2 { |
ac27a0ec DK |
1134 | __le32 inode; /* Inode number */ |
1135 | __le16 rec_len; /* Directory entry length */ | |
1136 | __u8 name_len; /* Name length */ | |
1137 | __u8 file_type; | |
617ba13b | 1138 | char name[EXT4_NAME_LEN]; /* File name */ |
ac27a0ec DK |
1139 | }; |
1140 | ||
1141 | /* | |
617ba13b | 1142 | * Ext4 directory file types. Only the low 3 bits are used. The |
ac27a0ec DK |
1143 | * other bits are reserved for now. |
1144 | */ | |
617ba13b MC |
1145 | #define EXT4_FT_UNKNOWN 0 |
1146 | #define EXT4_FT_REG_FILE 1 | |
1147 | #define EXT4_FT_DIR 2 | |
1148 | #define EXT4_FT_CHRDEV 3 | |
1149 | #define EXT4_FT_BLKDEV 4 | |
1150 | #define EXT4_FT_FIFO 5 | |
1151 | #define EXT4_FT_SOCK 6 | |
1152 | #define EXT4_FT_SYMLINK 7 | |
ac27a0ec | 1153 | |
617ba13b | 1154 | #define EXT4_FT_MAX 8 |
ac27a0ec DK |
1155 | |
1156 | /* | |
617ba13b | 1157 | * EXT4_DIR_PAD defines the directory entries boundaries |
ac27a0ec DK |
1158 | * |
1159 | * NOTE: It must be a multiple of 4 | |
1160 | */ | |
617ba13b MC |
1161 | #define EXT4_DIR_PAD 4 |
1162 | #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) | |
1163 | #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ | |
1164 | ~EXT4_DIR_ROUND) | |
a72d7f83 JK |
1165 | #define EXT4_MAX_REC_LEN ((1<<16)-1) |
1166 | ||
ac27a0ec DK |
1167 | /* |
1168 | * Hash Tree Directory indexing | |
1169 | * (c) Daniel Phillips, 2001 | |
1170 | */ | |
1171 | ||
4074fe37 ES |
1172 | #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ |
1173 | EXT4_FEATURE_COMPAT_DIR_INDEX) && \ | |
617ba13b MC |
1174 | (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) |
1175 | #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) | |
1176 | #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) | |
ac27a0ec DK |
1177 | |
1178 | /* Legal values for the dx_root hash_version field: */ | |
1179 | ||
1180 | #define DX_HASH_LEGACY 0 | |
1181 | #define DX_HASH_HALF_MD4 1 | |
1182 | #define DX_HASH_TEA 2 | |
f99b2589 TT |
1183 | #define DX_HASH_LEGACY_UNSIGNED 3 |
1184 | #define DX_HASH_HALF_MD4_UNSIGNED 4 | |
1185 | #define DX_HASH_TEA_UNSIGNED 5 | |
ac27a0ec DK |
1186 | |
1187 | #ifdef __KERNEL__ | |
1188 | ||
1189 | /* hash info structure used by the directory hash */ | |
1190 | struct dx_hash_info | |
1191 | { | |
1192 | u32 hash; | |
1193 | u32 minor_hash; | |
1194 | int hash_version; | |
1195 | u32 *seed; | |
1196 | }; | |
1197 | ||
617ba13b | 1198 | #define EXT4_HTREE_EOF 0x7fffffff |
ac27a0ec DK |
1199 | |
1200 | /* | |
617ba13b | 1201 | * Control parameters used by ext4_htree_next_block |
ac27a0ec DK |
1202 | */ |
1203 | #define HASH_NB_ALWAYS 1 | |
1204 | ||
1205 | ||
1206 | /* | |
1207 | * Describe an inode's exact location on disk and in memory | |
1208 | */ | |
617ba13b | 1209 | struct ext4_iloc |
ac27a0ec DK |
1210 | { |
1211 | struct buffer_head *bh; | |
1212 | unsigned long offset; | |
fd2d4291 | 1213 | ext4_group_t block_group; |
ac27a0ec DK |
1214 | }; |
1215 | ||
617ba13b | 1216 | static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) |
ac27a0ec | 1217 | { |
617ba13b | 1218 | return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); |
ac27a0ec DK |
1219 | } |
1220 | ||
1221 | /* | |
1222 | * This structure is stuffed into the struct file's private_data field | |
1223 | * for directories. It is where we put information so that we can do | |
1224 | * readdir operations in hash tree order. | |
1225 | */ | |
1226 | struct dir_private_info { | |
1227 | struct rb_root root; | |
1228 | struct rb_node *curr_node; | |
1229 | struct fname *extra_fname; | |
1230 | loff_t last_pos; | |
1231 | __u32 curr_hash; | |
1232 | __u32 curr_minor_hash; | |
1233 | __u32 next_hash; | |
1234 | }; | |
1235 | ||
1236 | /* calculate the first block number of the group */ | |
617ba13b | 1237 | static inline ext4_fsblk_t |
fd2d4291 | 1238 | ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) |
ac27a0ec | 1239 | { |
617ba13b MC |
1240 | return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + |
1241 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); | |
ac27a0ec DK |
1242 | } |
1243 | ||
1244 | /* | |
1245 | * Special error return code only used by dx_probe() and its callers. | |
1246 | */ | |
1247 | #define ERR_BAD_DX_DIR -75000 | |
1248 | ||
72b64b59 | 1249 | void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, |
a9df9a49 | 1250 | ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); |
3a5b2ecd | 1251 | |
9f6200bb TT |
1252 | extern struct proc_dir_entry *ext4_proc_root; |
1253 | ||
ac27a0ec DK |
1254 | /* |
1255 | * Function prototypes | |
1256 | */ | |
1257 | ||
1258 | /* | |
1259 | * Ok, these declarations are also in <linux/kernel.h> but none of the | |
617ba13b | 1260 | * ext4 source programs needs to include it so they are duplicated here. |
ac27a0ec | 1261 | */ |
8c55e204 DK |
1262 | # define NORET_TYPE /**/ |
1263 | # define ATTRIB_NORET __attribute__((noreturn)) | |
1264 | # define NORET_AND noreturn, | |
ac27a0ec | 1265 | |
498e5f24 TT |
1266 | /* bitmap.c */ |
1267 | extern unsigned int ext4_count_free(struct buffer_head *, unsigned); | |
1268 | ||
ac27a0ec | 1269 | /* balloc.c */ |
3a5b2ecd MC |
1270 | extern unsigned int ext4_block_group(struct super_block *sb, |
1271 | ext4_fsblk_t blocknr); | |
1272 | extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, | |
1273 | ext4_fsblk_t blocknr); | |
fd2d4291 AM |
1274 | extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); |
1275 | extern unsigned long ext4_bg_num_gdb(struct super_block *sb, | |
1276 | ext4_group_t group); | |
7061eba7 | 1277 | extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, |
617ba13b | 1278 | ext4_fsblk_t goal, unsigned long *count, int *errp); |
5c791616 | 1279 | extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); |
8c3bf8a0 | 1280 | extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); |
af5bc92d | 1281 | extern void ext4_free_blocks(handle_t *handle, struct inode *inode, |
c9de560d | 1282 | ext4_fsblk_t block, unsigned long count, int metadata); |
e21675d4 AK |
1283 | extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, |
1284 | ext4_fsblk_t block, unsigned long count); | |
af5bc92d TT |
1285 | extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); |
1286 | extern void ext4_check_blocks_bitmap(struct super_block *); | |
617ba13b | 1287 | extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, |
fd2d4291 | 1288 | ext4_group_t block_group, |
ac27a0ec | 1289 | struct buffer_head ** bh); |
617ba13b | 1290 | extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); |
bb23c20a TT |
1291 | struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, |
1292 | ext4_group_t block_group); | |
1293 | extern unsigned ext4_init_block_bitmap(struct super_block *sb, | |
1294 | struct buffer_head *bh, | |
1295 | ext4_group_t group, | |
1296 | struct ext4_group_desc *desc); | |
1297 | #define ext4_free_blocks_after_init(sb, group, desc) \ | |
1298 | ext4_init_block_bitmap(sb, NULL, group, desc) | |
ac27a0ec DK |
1299 | |
1300 | /* dir.c */ | |
617ba13b MC |
1301 | extern int ext4_check_dir_entry(const char *, struct inode *, |
1302 | struct ext4_dir_entry_2 *, | |
498e5f24 | 1303 | struct buffer_head *, unsigned int); |
617ba13b | 1304 | extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, |
ac27a0ec | 1305 | __u32 minor_hash, |
617ba13b MC |
1306 | struct ext4_dir_entry_2 *dirent); |
1307 | extern void ext4_htree_free_dir_info(struct dir_private_info *p); | |
ac27a0ec DK |
1308 | |
1309 | /* fsync.c */ | |
af5bc92d | 1310 | extern int ext4_sync_file(struct file *, struct dentry *, int); |
ac27a0ec DK |
1311 | |
1312 | /* hash.c */ | |
617ba13b | 1313 | extern int ext4fs_dirhash(const char *name, int len, struct |
ac27a0ec DK |
1314 | dx_hash_info *hinfo); |
1315 | ||
1316 | /* ialloc.c */ | |
f157a4aa | 1317 | extern struct inode *ext4_new_inode(handle_t *, struct inode *, int, |
11013911 | 1318 | const struct qstr *qstr, __u32 goal); |
af5bc92d TT |
1319 | extern void ext4_free_inode(handle_t *, struct inode *); |
1320 | extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); | |
1321 | extern unsigned long ext4_count_free_inodes(struct super_block *); | |
1322 | extern unsigned long ext4_count_dirs(struct super_block *); | |
1323 | extern void ext4_check_inodes_bitmap(struct super_block *); | |
bb23c20a TT |
1324 | extern unsigned ext4_init_inode_bitmap(struct super_block *sb, |
1325 | struct buffer_head *bh, | |
1326 | ext4_group_t group, | |
1327 | struct ext4_group_desc *desc); | |
1328 | extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap); | |
ac27a0ec | 1329 | |
c9de560d AT |
1330 | /* mballoc.c */ |
1331 | extern long ext4_mb_stats; | |
1332 | extern long ext4_mb_max_to_scan; | |
1333 | extern int ext4_mb_init(struct super_block *, int); | |
1334 | extern int ext4_mb_release(struct super_block *); | |
1335 | extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, | |
1336 | struct ext4_allocation_request *, int *); | |
1337 | extern int ext4_mb_reserve_blocks(struct super_block *, int); | |
c2ea3fde | 1338 | extern void ext4_discard_preallocations(struct inode *); |
c9de560d AT |
1339 | extern int __init init_ext4_mballoc(void); |
1340 | extern void exit_ext4_mballoc(void); | |
1341 | extern void ext4_mb_free_blocks(handle_t *, struct inode *, | |
0610b6e9 | 1342 | ext4_fsblk_t, unsigned long, int, unsigned long *); |
920313a7 | 1343 | extern int ext4_mb_add_groupinfo(struct super_block *sb, |
5f21b0e6 FB |
1344 | ext4_group_t i, struct ext4_group_desc *desc); |
1345 | extern void ext4_mb_update_group_info(struct ext4_group_info *grp, | |
1346 | ext4_grpblk_t add); | |
920313a7 AK |
1347 | extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); |
1348 | extern void ext4_mb_put_buddy_cache_lock(struct super_block *, | |
1349 | ext4_group_t, int); | |
ac27a0ec | 1350 | /* inode.c */ |
617ba13b MC |
1351 | int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, |
1352 | struct buffer_head *bh, ext4_fsblk_t blocknr); | |
725d26d3 AK |
1353 | struct buffer_head *ext4_getblk(handle_t *, struct inode *, |
1354 | ext4_lblk_t, int, int *); | |
1355 | struct buffer_head *ext4_bread(handle_t *, struct inode *, | |
1356 | ext4_lblk_t, int, int *); | |
6873fa0d ES |
1357 | int ext4_get_block(struct inode *inode, sector_t iblock, |
1358 | struct buffer_head *bh_result, int create); | |
ac27a0ec | 1359 | |
1d1fe1ee | 1360 | extern struct inode *ext4_iget(struct super_block *, unsigned long); |
af5bc92d TT |
1361 | extern int ext4_write_inode(struct inode *, int); |
1362 | extern int ext4_setattr(struct dentry *, struct iattr *); | |
3e3398a0 MC |
1363 | extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, |
1364 | struct kstat *stat); | |
af5bc92d TT |
1365 | extern void ext4_delete_inode(struct inode *); |
1366 | extern int ext4_sync_inode(handle_t *, struct inode *); | |
617ba13b MC |
1367 | extern void ext4_dirty_inode(struct inode *); |
1368 | extern int ext4_change_inode_journal_flag(struct inode *, int); | |
1369 | extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); | |
91ef4caf | 1370 | extern int ext4_can_truncate(struct inode *inode); |
af5bc92d | 1371 | extern void ext4_truncate(struct inode *); |
617ba13b | 1372 | extern void ext4_set_inode_flags(struct inode *); |
ff9ddf7e | 1373 | extern void ext4_get_inode_flags(struct ext4_inode_info *); |
ccd2506b | 1374 | extern int ext4_alloc_da_blocks(struct inode *inode); |
617ba13b | 1375 | extern void ext4_set_aops(struct inode *inode); |
a86c6181 | 1376 | extern int ext4_writepage_trans_blocks(struct inode *); |
a02908f1 | 1377 | extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); |
f3bd1f3f | 1378 | extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); |
cf108bca | 1379 | extern int ext4_block_truncate_page(handle_t *handle, |
a86c6181 | 1380 | struct address_space *mapping, loff_t from); |
c2ec175c | 1381 | extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); |
60e58e0f | 1382 | extern qsize_t ext4_get_reserved_space(struct inode *inode); |
ac27a0ec DK |
1383 | |
1384 | /* ioctl.c */ | |
5cdd7b2d | 1385 | extern long ext4_ioctl(struct file *, unsigned int, unsigned long); |
af5bc92d | 1386 | extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); |
ac27a0ec | 1387 | |
c14c6fd5 | 1388 | /* migrate.c */ |
2a43a878 | 1389 | extern int ext4_ext_migrate(struct inode *); |
3d0518f4 | 1390 | |
ac27a0ec | 1391 | /* namei.c */ |
3d0518f4 WY |
1392 | extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize); |
1393 | extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize); | |
617ba13b MC |
1394 | extern int ext4_orphan_add(handle_t *, struct inode *); |
1395 | extern int ext4_orphan_del(handle_t *, struct inode *); | |
1396 | extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, | |
ac27a0ec DK |
1397 | __u32 start_minor_hash, __u32 *next_hash); |
1398 | ||
1399 | /* resize.c */ | |
617ba13b MC |
1400 | extern int ext4_group_add(struct super_block *sb, |
1401 | struct ext4_new_group_data *input); | |
1402 | extern int ext4_group_extend(struct super_block *sb, | |
1403 | struct ext4_super_block *es, | |
1404 | ext4_fsblk_t n_blocks_count); | |
ac27a0ec DK |
1405 | |
1406 | /* super.c */ | |
af5bc92d | 1407 | extern void ext4_error(struct super_block *, const char *, const char *, ...) |
ac27a0ec | 1408 | __attribute__ ((format (printf, 3, 4))); |
af5bc92d TT |
1409 | extern void __ext4_std_error(struct super_block *, const char *, int); |
1410 | extern void ext4_abort(struct super_block *, const char *, const char *, ...) | |
ac27a0ec | 1411 | __attribute__ ((format (printf, 3, 4))); |
af5bc92d | 1412 | extern void ext4_warning(struct super_block *, const char *, const char *, ...) |
ac27a0ec | 1413 | __attribute__ ((format (printf, 3, 4))); |
b31e1552 ES |
1414 | extern void ext4_msg(struct super_block *, const char *, const char *, ...) |
1415 | __attribute__ ((format (printf, 3, 4))); | |
5d1b1b3f AK |
1416 | extern void ext4_grp_locked_error(struct super_block *, ext4_group_t, |
1417 | const char *, const char *, ...) | |
1418 | __attribute__ ((format (printf, 4, 5))); | |
af5bc92d | 1419 | extern void ext4_update_dynamic_rev(struct super_block *sb); |
99e6f829 AK |
1420 | extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, |
1421 | __u32 compat); | |
1422 | extern int ext4_update_rocompat_feature(handle_t *handle, | |
1423 | struct super_block *sb, __u32 rocompat); | |
1424 | extern int ext4_update_incompat_feature(handle_t *handle, | |
1425 | struct super_block *sb, __u32 incompat); | |
8fadc143 AR |
1426 | extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, |
1427 | struct ext4_group_desc *bg); | |
1428 | extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, | |
1429 | struct ext4_group_desc *bg); | |
1430 | extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, | |
1431 | struct ext4_group_desc *bg); | |
560671a0 AK |
1432 | extern __u32 ext4_free_blks_count(struct super_block *sb, |
1433 | struct ext4_group_desc *bg); | |
1434 | extern __u32 ext4_free_inodes_count(struct super_block *sb, | |
1435 | struct ext4_group_desc *bg); | |
1436 | extern __u32 ext4_used_dirs_count(struct super_block *sb, | |
1437 | struct ext4_group_desc *bg); | |
1438 | extern __u32 ext4_itable_unused_count(struct super_block *sb, | |
1439 | struct ext4_group_desc *bg); | |
8fadc143 AR |
1440 | extern void ext4_block_bitmap_set(struct super_block *sb, |
1441 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
1442 | extern void ext4_inode_bitmap_set(struct super_block *sb, | |
1443 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
1444 | extern void ext4_inode_table_set(struct super_block *sb, | |
1445 | struct ext4_group_desc *bg, ext4_fsblk_t blk); | |
560671a0 AK |
1446 | extern void ext4_free_blks_set(struct super_block *sb, |
1447 | struct ext4_group_desc *bg, __u32 count); | |
1448 | extern void ext4_free_inodes_set(struct super_block *sb, | |
1449 | struct ext4_group_desc *bg, __u32 count); | |
1450 | extern void ext4_used_dirs_set(struct super_block *sb, | |
1451 | struct ext4_group_desc *bg, __u32 count); | |
1452 | extern void ext4_itable_unused_set(struct super_block *sb, | |
1453 | struct ext4_group_desc *bg, __u32 count); | |
bb23c20a TT |
1454 | extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, |
1455 | struct ext4_group_desc *gdp); | |
1456 | extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, | |
1457 | struct ext4_group_desc *gdp); | |
bd81d8ee LV |
1458 | |
1459 | static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) | |
1460 | { | |
1461 | return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | | |
6bc9feff | 1462 | le32_to_cpu(es->s_blocks_count_lo); |
bd81d8ee LV |
1463 | } |
1464 | ||
1465 | static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) | |
1466 | { | |
1467 | return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | | |
308ba3ec | 1468 | le32_to_cpu(es->s_r_blocks_count_lo); |
bd81d8ee LV |
1469 | } |
1470 | ||
1471 | static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) | |
1472 | { | |
1473 | return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | | |
308ba3ec | 1474 | le32_to_cpu(es->s_free_blocks_count_lo); |
bd81d8ee LV |
1475 | } |
1476 | ||
1477 | static inline void ext4_blocks_count_set(struct ext4_super_block *es, | |
1478 | ext4_fsblk_t blk) | |
1479 | { | |
6bc9feff | 1480 | es->s_blocks_count_lo = cpu_to_le32((u32)blk); |
bd81d8ee LV |
1481 | es->s_blocks_count_hi = cpu_to_le32(blk >> 32); |
1482 | } | |
1483 | ||
1484 | static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, | |
1485 | ext4_fsblk_t blk) | |
1486 | { | |
308ba3ec | 1487 | es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); |
bd81d8ee LV |
1488 | es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); |
1489 | } | |
1490 | ||
1491 | static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, | |
1492 | ext4_fsblk_t blk) | |
1493 | { | |
308ba3ec | 1494 | es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); |
bd81d8ee LV |
1495 | es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); |
1496 | } | |
1497 | ||
a48380f7 AK |
1498 | static inline loff_t ext4_isize(struct ext4_inode *raw_inode) |
1499 | { | |
06a279d6 TT |
1500 | if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) |
1501 | return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | | |
1502 | le32_to_cpu(raw_inode->i_size_lo); | |
1503 | else | |
1504 | return (loff_t) le32_to_cpu(raw_inode->i_size_lo); | |
a48380f7 | 1505 | } |
bd81d8ee | 1506 | |
a48380f7 AK |
1507 | static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) |
1508 | { | |
1509 | raw_inode->i_size_lo = cpu_to_le32(i_size); | |
1510 | raw_inode->i_size_high = cpu_to_le32(i_size >> 32); | |
1511 | } | |
ac27a0ec | 1512 | |
c9de560d AT |
1513 | static inline |
1514 | struct ext4_group_info *ext4_get_group_info(struct super_block *sb, | |
af5bc92d | 1515 | ext4_group_t group) |
c9de560d AT |
1516 | { |
1517 | struct ext4_group_info ***grp_info; | |
1518 | long indexv, indexh; | |
1519 | grp_info = EXT4_SB(sb)->s_group_info; | |
1520 | indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); | |
1521 | indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); | |
1522 | return grp_info[indexv][indexh]; | |
1523 | } | |
1524 | ||
8df9675f TT |
1525 | /* |
1526 | * Reading s_groups_count requires using smp_rmb() afterwards. See | |
1527 | * the locking protocol documented in the comments of ext4_group_add() | |
1528 | * in resize.c | |
1529 | */ | |
1530 | static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) | |
1531 | { | |
1532 | ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; | |
1533 | ||
1534 | smp_rmb(); | |
1535 | return ngroups; | |
1536 | } | |
c9de560d | 1537 | |
772cb7c8 JS |
1538 | static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, |
1539 | ext4_group_t block_group) | |
1540 | { | |
1541 | return block_group >> sbi->s_log_groups_per_flex; | |
1542 | } | |
1543 | ||
1544 | static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) | |
1545 | { | |
1546 | return 1 << sbi->s_log_groups_per_flex; | |
1547 | } | |
1548 | ||
617ba13b | 1549 | #define ext4_std_error(sb, errno) \ |
ac27a0ec DK |
1550 | do { \ |
1551 | if ((errno)) \ | |
4db9c54a | 1552 | __ext4_std_error((sb), __func__, (errno)); \ |
ac27a0ec DK |
1553 | } while (0) |
1554 | ||
a30d542a | 1555 | #ifdef CONFIG_SMP |
179f7ebf | 1556 | /* Each CPU can accumulate percpu_counter_batch blocks in their local |
a30d542a | 1557 | * counters. So we need to make sure we have free blocks more |
179f7ebf | 1558 | * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. |
a30d542a | 1559 | */ |
179f7ebf | 1560 | #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) |
a30d542a AK |
1561 | #else |
1562 | #define EXT4_FREEBLOCKS_WATERMARK 0 | |
1563 | #endif | |
1564 | ||
cf17fea6 AK |
1565 | static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) |
1566 | { | |
1567 | /* | |
1568 | * XXX: replace with spinlock if seen contended -bzzz | |
1569 | */ | |
1570 | down_write(&EXT4_I(inode)->i_data_sem); | |
1571 | if (newsize > EXT4_I(inode)->i_disksize) | |
1572 | EXT4_I(inode)->i_disksize = newsize; | |
1573 | up_write(&EXT4_I(inode)->i_data_sem); | |
1574 | return ; | |
1575 | } | |
a30d542a | 1576 | |
5d1b1b3f AK |
1577 | struct ext4_group_info { |
1578 | unsigned long bb_state; | |
1579 | struct rb_root bb_free_root; | |
1580 | unsigned short bb_first_free; | |
1581 | unsigned short bb_free; | |
1582 | unsigned short bb_fragments; | |
1583 | struct list_head bb_prealloc_list; | |
1584 | #ifdef DOUBLE_CHECK | |
1585 | void *bb_bitmap; | |
1586 | #endif | |
1587 | struct rw_semaphore alloc_sem; | |
1588 | unsigned short bb_counters[]; | |
1589 | }; | |
1590 | ||
1591 | #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 | |
5d1b1b3f AK |
1592 | |
1593 | #define EXT4_MB_GRP_NEED_INIT(grp) \ | |
1594 | (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) | |
1595 | ||
955ce5f5 AK |
1596 | static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, |
1597 | ext4_group_t group) | |
5d1b1b3f | 1598 | { |
955ce5f5 AK |
1599 | return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); |
1600 | } | |
5d1b1b3f | 1601 | |
955ce5f5 AK |
1602 | static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) |
1603 | { | |
1604 | spin_lock(ext4_group_lock_ptr(sb, group)); | |
5d1b1b3f AK |
1605 | } |
1606 | ||
1607 | static inline void ext4_unlock_group(struct super_block *sb, | |
1608 | ext4_group_t group) | |
1609 | { | |
955ce5f5 | 1610 | spin_unlock(ext4_group_lock_ptr(sb, group)); |
5d1b1b3f AK |
1611 | } |
1612 | ||
ac27a0ec DK |
1613 | /* |
1614 | * Inodes and files operations | |
1615 | */ | |
1616 | ||
1617 | /* dir.c */ | |
617ba13b | 1618 | extern const struct file_operations ext4_dir_operations; |
ac27a0ec DK |
1619 | |
1620 | /* file.c */ | |
c5ef1c42 | 1621 | extern const struct inode_operations ext4_file_inode_operations; |
617ba13b | 1622 | extern const struct file_operations ext4_file_operations; |
ac27a0ec DK |
1623 | |
1624 | /* namei.c */ | |
c5ef1c42 AV |
1625 | extern const struct inode_operations ext4_dir_inode_operations; |
1626 | extern const struct inode_operations ext4_special_inode_operations; | |
596397b7 | 1627 | extern struct dentry *ext4_get_parent(struct dentry *child); |
ac27a0ec DK |
1628 | |
1629 | /* symlink.c */ | |
c5ef1c42 AV |
1630 | extern const struct inode_operations ext4_symlink_inode_operations; |
1631 | extern const struct inode_operations ext4_fast_symlink_inode_operations; | |
ac27a0ec | 1632 | |
6fd058f7 TT |
1633 | /* block_validity */ |
1634 | extern void ext4_release_system_zone(struct super_block *sb); | |
1635 | extern int ext4_setup_system_zone(struct super_block *sb); | |
1636 | extern int __init init_ext4_system_zone(void); | |
1637 | extern void exit_ext4_system_zone(void); | |
1638 | extern int ext4_data_block_valid(struct ext4_sb_info *sbi, | |
1639 | ext4_fsblk_t start_blk, | |
1640 | unsigned int count); | |
1641 | ||
a86c6181 AT |
1642 | /* extents.c */ |
1643 | extern int ext4_ext_tree_init(handle_t *handle, struct inode *); | |
1644 | extern int ext4_ext_writepage_trans_blocks(struct inode *, int); | |
a02908f1 MC |
1645 | extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, |
1646 | int chunk); | |
a86c6181 | 1647 | extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, |
498e5f24 | 1648 | ext4_lblk_t iblock, unsigned int max_blocks, |
c2177057 | 1649 | struct buffer_head *bh_result, int flags); |
cf108bca | 1650 | extern void ext4_ext_truncate(struct inode *); |
a86c6181 AT |
1651 | extern void ext4_ext_init(struct super_block *); |
1652 | extern void ext4_ext_release(struct super_block *); | |
a2df2a63 AA |
1653 | extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, |
1654 | loff_t len); | |
12b7ac17 TT |
1655 | extern int ext4_get_blocks(handle_t *handle, struct inode *inode, |
1656 | sector_t block, unsigned int max_blocks, | |
c2177057 | 1657 | struct buffer_head *bh, int flags); |
3a06d778 AK |
1658 | extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
1659 | __u64 start, __u64 len); | |
748de673 AF |
1660 | /* move_extent.c */ |
1661 | extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, | |
1662 | __u64 start_orig, __u64 start_donor, | |
1663 | __u64 len, __u64 *moved_len); | |
1664 | ||
3a06d778 | 1665 | |
2ccb5fb9 AK |
1666 | /* |
1667 | * Add new method to test wether block and inode bitmaps are properly | |
1668 | * initialized. With uninit_bg reading the block from disk is not enough | |
1669 | * to mark the bitmap uptodate. We need to also zero-out the bitmap | |
1670 | */ | |
1671 | #define BH_BITMAP_UPTODATE BH_JBDPrivateStart | |
1672 | ||
1673 | static inline int bitmap_uptodate(struct buffer_head *bh) | |
1674 | { | |
1675 | return (buffer_uptodate(bh) && | |
1676 | test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); | |
1677 | } | |
1678 | static inline void set_bitmap_uptodate(struct buffer_head *bh) | |
1679 | { | |
1680 | set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); | |
1681 | } | |
1682 | ||
ac27a0ec DK |
1683 | #endif /* __KERNEL__ */ |
1684 | ||
3dcf5451 | 1685 | #endif /* _EXT4_H */ |