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Slab allocators: consistent ZERO_SIZE_PTR support and NULL result semantics
[deliverable/linux.git] / include / linux / ext4_fs.h
1 /*
2 * linux/include/linux/ext4_fs.h
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/include/linux/minix_fs.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
16 #ifndef _LINUX_EXT4_FS_H
17 #define _LINUX_EXT4_FS_H
18
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
22
23 /*
24 * The second extended filesystem constants/structures
25 */
26
27 /*
28 * Define EXT4FS_DEBUG to produce debug messages
29 */
30 #undef EXT4FS_DEBUG
31
32 /*
33 * Define EXT4_RESERVATION to reserve data blocks for expanding files
34 */
35 #define EXT4_DEFAULT_RESERVE_BLOCKS 8
36 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
37 #define EXT4_MAX_RESERVE_BLOCKS 1027
38 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
39 /*
40 * Always enable hashed directories
41 */
42 #define CONFIG_EXT4_INDEX
43
44 /*
45 * Debug code
46 */
47 #ifdef EXT4FS_DEBUG
48 #define ext4_debug(f, a...) \
49 do { \
50 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
51 __FILE__, __LINE__, __FUNCTION__); \
52 printk (KERN_DEBUG f, ## a); \
53 } while (0)
54 #else
55 #define ext4_debug(f, a...) do {} while (0)
56 #endif
57
58 /*
59 * Special inodes numbers
60 */
61 #define EXT4_BAD_INO 1 /* Bad blocks inode */
62 #define EXT4_ROOT_INO 2 /* Root inode */
63 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
64 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
65 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
66 #define EXT4_JOURNAL_INO 8 /* Journal inode */
67
68 /* First non-reserved inode for old ext4 filesystems */
69 #define EXT4_GOOD_OLD_FIRST_INO 11
70
71 /*
72 * Maximal count of links to a file
73 */
74 #define EXT4_LINK_MAX 32000
75
76 /*
77 * Macro-instructions used to manage several block sizes
78 */
79 #define EXT4_MIN_BLOCK_SIZE 1024
80 #define EXT4_MAX_BLOCK_SIZE 4096
81 #define EXT4_MIN_BLOCK_LOG_SIZE 10
82 #ifdef __KERNEL__
83 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
84 #else
85 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
86 #endif
87 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
88 #ifdef __KERNEL__
89 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
90 #else
91 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
92 #endif
93 #ifdef __KERNEL__
94 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
95 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
96 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
97 #else
98 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
99 EXT4_GOOD_OLD_INODE_SIZE : \
100 (s)->s_inode_size)
101 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
102 EXT4_GOOD_OLD_FIRST_INO : \
103 (s)->s_first_ino)
104 #endif
105
106 /*
107 * Macro-instructions used to manage fragments
108 */
109 #define EXT4_MIN_FRAG_SIZE 1024
110 #define EXT4_MAX_FRAG_SIZE 4096
111 #define EXT4_MIN_FRAG_LOG_SIZE 10
112 #ifdef __KERNEL__
113 # define EXT4_FRAG_SIZE(s) (EXT4_SB(s)->s_frag_size)
114 # define EXT4_FRAGS_PER_BLOCK(s) (EXT4_SB(s)->s_frags_per_block)
115 #else
116 # define EXT4_FRAG_SIZE(s) (EXT4_MIN_FRAG_SIZE << (s)->s_log_frag_size)
117 # define EXT4_FRAGS_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_FRAG_SIZE(s))
118 #endif
119
120 /*
121 * Structure of a blocks group descriptor
122 */
123 struct ext4_group_desc
124 {
125 __le32 bg_block_bitmap; /* Blocks bitmap block */
126 __le32 bg_inode_bitmap; /* Inodes bitmap block */
127 __le32 bg_inode_table; /* Inodes table block */
128 __le16 bg_free_blocks_count; /* Free blocks count */
129 __le16 bg_free_inodes_count; /* Free inodes count */
130 __le16 bg_used_dirs_count; /* Directories count */
131 __u16 bg_flags;
132 __u32 bg_reserved[3];
133 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
134 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
135 __le32 bg_inode_table_hi; /* Inodes table block MSB */
136 };
137
138 #ifdef __KERNEL__
139 #include <linux/ext4_fs_i.h>
140 #include <linux/ext4_fs_sb.h>
141 #endif
142 /*
143 * Macro-instructions used to manage group descriptors
144 */
145 #define EXT4_MIN_DESC_SIZE 32
146 #define EXT4_MIN_DESC_SIZE_64BIT 64
147 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
148 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
149 #ifdef __KERNEL__
150 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
151 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
152 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
153 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
154 #else
155 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
156 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
157 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
158 #endif
159
160 /*
161 * Constants relative to the data blocks
162 */
163 #define EXT4_NDIR_BLOCKS 12
164 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
165 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
166 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
167 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
168
169 /*
170 * Inode flags
171 */
172 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
173 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
174 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
175 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
176 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
177 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
178 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
179 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
180 /* Reserved for compression usage... */
181 #define EXT4_DIRTY_FL 0x00000100
182 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
183 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
184 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
185 /* End compression flags --- maybe not all used */
186 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
187 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
188 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
189 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
190 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
191 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
192 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
193 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
194
195 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
196 #define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
197
198 /*
199 * Inode dynamic state flags
200 */
201 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
202 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
203 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
204
205 /* Used to pass group descriptor data when online resize is done */
206 struct ext4_new_group_input {
207 __u32 group; /* Group number for this data */
208 __u64 block_bitmap; /* Absolute block number of block bitmap */
209 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
210 __u64 inode_table; /* Absolute block number of inode table start */
211 __u32 blocks_count; /* Total number of blocks in this group */
212 __u16 reserved_blocks; /* Number of reserved blocks in this group */
213 __u16 unused;
214 };
215
216 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
217 struct ext4_new_group_data {
218 __u32 group;
219 __u64 block_bitmap;
220 __u64 inode_bitmap;
221 __u64 inode_table;
222 __u32 blocks_count;
223 __u16 reserved_blocks;
224 __u16 unused;
225 __u32 free_blocks_count;
226 };
227
228
229 /*
230 * ioctl commands
231 */
232 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
233 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
234 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
235 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
236 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
237 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
238 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
239 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
240 #ifdef CONFIG_JBD_DEBUG
241 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
242 #endif
243 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
244 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
245
246 /*
247 * ioctl commands in 32 bit emulation
248 */
249 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
250 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
251 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
252 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
253 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
254 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
255 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
256 #ifdef CONFIG_JBD_DEBUG
257 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
258 #endif
259 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
260 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
261
262
263 /*
264 * Mount options
265 */
266 struct ext4_mount_options {
267 unsigned long s_mount_opt;
268 uid_t s_resuid;
269 gid_t s_resgid;
270 unsigned long s_commit_interval;
271 #ifdef CONFIG_QUOTA
272 int s_jquota_fmt;
273 char *s_qf_names[MAXQUOTAS];
274 #endif
275 };
276
277 /*
278 * Structure of an inode on the disk
279 */
280 struct ext4_inode {
281 __le16 i_mode; /* File mode */
282 __le16 i_uid; /* Low 16 bits of Owner Uid */
283 __le32 i_size; /* Size in bytes */
284 __le32 i_atime; /* Access time */
285 __le32 i_ctime; /* Creation time */
286 __le32 i_mtime; /* Modification time */
287 __le32 i_dtime; /* Deletion Time */
288 __le16 i_gid; /* Low 16 bits of Group Id */
289 __le16 i_links_count; /* Links count */
290 __le32 i_blocks; /* Blocks count */
291 __le32 i_flags; /* File flags */
292 union {
293 struct {
294 __u32 l_i_reserved1;
295 } linux1;
296 struct {
297 __u32 h_i_translator;
298 } hurd1;
299 struct {
300 __u32 m_i_reserved1;
301 } masix1;
302 } osd1; /* OS dependent 1 */
303 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
304 __le32 i_generation; /* File version (for NFS) */
305 __le32 i_file_acl; /* File ACL */
306 __le32 i_dir_acl; /* Directory ACL */
307 __le32 i_faddr; /* Fragment address */
308 union {
309 struct {
310 __u8 l_i_frag; /* Fragment number */
311 __u8 l_i_fsize; /* Fragment size */
312 __le16 l_i_file_acl_high;
313 __le16 l_i_uid_high; /* these 2 fields */
314 __le16 l_i_gid_high; /* were reserved2[0] */
315 __u32 l_i_reserved2;
316 } linux2;
317 struct {
318 __u8 h_i_frag; /* Fragment number */
319 __u8 h_i_fsize; /* Fragment size */
320 __u16 h_i_mode_high;
321 __u16 h_i_uid_high;
322 __u16 h_i_gid_high;
323 __u32 h_i_author;
324 } hurd2;
325 struct {
326 __u8 m_i_frag; /* Fragment number */
327 __u8 m_i_fsize; /* Fragment size */
328 __le16 m_i_file_acl_high;
329 __u32 m_i_reserved2[2];
330 } masix2;
331 } osd2; /* OS dependent 2 */
332 __le16 i_extra_isize;
333 __le16 i_pad1;
334 };
335
336 #define i_size_high i_dir_acl
337
338 #if defined(__KERNEL__) || defined(__linux__)
339 #define i_reserved1 osd1.linux1.l_i_reserved1
340 #define i_frag osd2.linux2.l_i_frag
341 #define i_fsize osd2.linux2.l_i_fsize
342 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
343 #define i_uid_low i_uid
344 #define i_gid_low i_gid
345 #define i_uid_high osd2.linux2.l_i_uid_high
346 #define i_gid_high osd2.linux2.l_i_gid_high
347 #define i_reserved2 osd2.linux2.l_i_reserved2
348
349 #elif defined(__GNU__)
350
351 #define i_translator osd1.hurd1.h_i_translator
352 #define i_frag osd2.hurd2.h_i_frag;
353 #define i_fsize osd2.hurd2.h_i_fsize;
354 #define i_uid_high osd2.hurd2.h_i_uid_high
355 #define i_gid_high osd2.hurd2.h_i_gid_high
356 #define i_author osd2.hurd2.h_i_author
357
358 #elif defined(__masix__)
359
360 #define i_reserved1 osd1.masix1.m_i_reserved1
361 #define i_frag osd2.masix2.m_i_frag
362 #define i_fsize osd2.masix2.m_i_fsize
363 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
364 #define i_reserved2 osd2.masix2.m_i_reserved2
365
366 #endif /* defined(__KERNEL__) || defined(__linux__) */
367
368 /*
369 * File system states
370 */
371 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
372 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
373 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
374
375 /*
376 * Mount flags
377 */
378 #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
379 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
380 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
381 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
382 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
383 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
384 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
385 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
386 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
387 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
388 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
389 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
390 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
391 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
392 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
393 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
394 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
395 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
396 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
397 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
398 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
399 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
400 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
401 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
402 #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
403
404 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
405 #ifndef _LINUX_EXT2_FS_H
406 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
407 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
408 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
409 EXT4_MOUNT_##opt)
410 #else
411 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
412 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
413 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
414 #endif
415
416 #define ext4_set_bit ext2_set_bit
417 #define ext4_set_bit_atomic ext2_set_bit_atomic
418 #define ext4_clear_bit ext2_clear_bit
419 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
420 #define ext4_test_bit ext2_test_bit
421 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
422 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
423
424 /*
425 * Maximal mount counts between two filesystem checks
426 */
427 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
428 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
429
430 /*
431 * Behaviour when detecting errors
432 */
433 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
434 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
435 #define EXT4_ERRORS_PANIC 3 /* Panic */
436 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
437
438 /*
439 * Structure of the super block
440 */
441 struct ext4_super_block {
442 /*00*/ __le32 s_inodes_count; /* Inodes count */
443 __le32 s_blocks_count; /* Blocks count */
444 __le32 s_r_blocks_count; /* Reserved blocks count */
445 __le32 s_free_blocks_count; /* Free blocks count */
446 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
447 __le32 s_first_data_block; /* First Data Block */
448 __le32 s_log_block_size; /* Block size */
449 __le32 s_log_frag_size; /* Fragment size */
450 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
451 __le32 s_frags_per_group; /* # Fragments per group */
452 __le32 s_inodes_per_group; /* # Inodes per group */
453 __le32 s_mtime; /* Mount time */
454 /*30*/ __le32 s_wtime; /* Write time */
455 __le16 s_mnt_count; /* Mount count */
456 __le16 s_max_mnt_count; /* Maximal mount count */
457 __le16 s_magic; /* Magic signature */
458 __le16 s_state; /* File system state */
459 __le16 s_errors; /* Behaviour when detecting errors */
460 __le16 s_minor_rev_level; /* minor revision level */
461 /*40*/ __le32 s_lastcheck; /* time of last check */
462 __le32 s_checkinterval; /* max. time between checks */
463 __le32 s_creator_os; /* OS */
464 __le32 s_rev_level; /* Revision level */
465 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
466 __le16 s_def_resgid; /* Default gid for reserved blocks */
467 /*
468 * These fields are for EXT4_DYNAMIC_REV superblocks only.
469 *
470 * Note: the difference between the compatible feature set and
471 * the incompatible feature set is that if there is a bit set
472 * in the incompatible feature set that the kernel doesn't
473 * know about, it should refuse to mount the filesystem.
474 *
475 * e2fsck's requirements are more strict; if it doesn't know
476 * about a feature in either the compatible or incompatible
477 * feature set, it must abort and not try to meddle with
478 * things it doesn't understand...
479 */
480 __le32 s_first_ino; /* First non-reserved inode */
481 __le16 s_inode_size; /* size of inode structure */
482 __le16 s_block_group_nr; /* block group # of this superblock */
483 __le32 s_feature_compat; /* compatible feature set */
484 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
485 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
486 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
487 /*78*/ char s_volume_name[16]; /* volume name */
488 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
489 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
490 /*
491 * Performance hints. Directory preallocation should only
492 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
493 */
494 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
495 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
496 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
497 /*
498 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
499 */
500 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
501 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
502 __le32 s_journal_dev; /* device number of journal file */
503 __le32 s_last_orphan; /* start of list of inodes to delete */
504 __le32 s_hash_seed[4]; /* HTREE hash seed */
505 __u8 s_def_hash_version; /* Default hash version to use */
506 __u8 s_reserved_char_pad;
507 __le16 s_desc_size; /* size of group descriptor */
508 /*100*/ __le32 s_default_mount_opts;
509 __le32 s_first_meta_bg; /* First metablock block group */
510 __le32 s_mkfs_time; /* When the filesystem was created */
511 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
512 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
513 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
514 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
515 __le32 s_free_blocks_count_hi; /* Free blocks count */
516 __u16 s_min_extra_isize; /* All inodes have at least # bytes */
517 __u16 s_want_extra_isize; /* New inodes should reserve # bytes */
518 __u32 s_flags; /* Miscellaneous flags */
519 __u16 s_raid_stride; /* RAID stride */
520 __u16 s_mmp_interval; /* # seconds to wait in MMP checking */
521 __u64 s_mmp_block; /* Block for multi-mount protection */
522 __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
523 __u32 s_reserved[163]; /* Padding to the end of the block */
524 };
525
526 #ifdef __KERNEL__
527 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
528 {
529 return sb->s_fs_info;
530 }
531 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
532 {
533 return container_of(inode, struct ext4_inode_info, vfs_inode);
534 }
535
536 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
537 {
538 return ino == EXT4_ROOT_INO ||
539 ino == EXT4_JOURNAL_INO ||
540 ino == EXT4_RESIZE_INO ||
541 (ino >= EXT4_FIRST_INO(sb) &&
542 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
543 }
544 #else
545 /* Assume that user mode programs are passing in an ext4fs superblock, not
546 * a kernel struct super_block. This will allow us to call the feature-test
547 * macros from user land. */
548 #define EXT4_SB(sb) (sb)
549 #endif
550
551 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
552
553 /*
554 * Codes for operating systems
555 */
556 #define EXT4_OS_LINUX 0
557 #define EXT4_OS_HURD 1
558 #define EXT4_OS_MASIX 2
559 #define EXT4_OS_FREEBSD 3
560 #define EXT4_OS_LITES 4
561
562 /*
563 * Revision levels
564 */
565 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
566 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
567
568 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
569 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
570
571 #define EXT4_GOOD_OLD_INODE_SIZE 128
572
573 /*
574 * Feature set definitions
575 */
576
577 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
578 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
579 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
580 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
581 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
582 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
583 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
584 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
585 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
586 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
587 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
588 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
589 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
590 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
591 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
592 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
593 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
594 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
595
596 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
597 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
598 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
599 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
600 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
601 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
602
603 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
604 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
605 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
606
607 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
608 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
609 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
610 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
611 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
612 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
613 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
614
615 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
616 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
617 EXT4_FEATURE_INCOMPAT_RECOVER| \
618 EXT4_FEATURE_INCOMPAT_META_BG| \
619 EXT4_FEATURE_INCOMPAT_EXTENTS| \
620 EXT4_FEATURE_INCOMPAT_64BIT)
621 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
622 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
623 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
624
625 /*
626 * Default values for user and/or group using reserved blocks
627 */
628 #define EXT4_DEF_RESUID 0
629 #define EXT4_DEF_RESGID 0
630
631 /*
632 * Default mount options
633 */
634 #define EXT4_DEFM_DEBUG 0x0001
635 #define EXT4_DEFM_BSDGROUPS 0x0002
636 #define EXT4_DEFM_XATTR_USER 0x0004
637 #define EXT4_DEFM_ACL 0x0008
638 #define EXT4_DEFM_UID16 0x0010
639 #define EXT4_DEFM_JMODE 0x0060
640 #define EXT4_DEFM_JMODE_DATA 0x0020
641 #define EXT4_DEFM_JMODE_ORDERED 0x0040
642 #define EXT4_DEFM_JMODE_WBACK 0x0060
643
644 /*
645 * Structure of a directory entry
646 */
647 #define EXT4_NAME_LEN 255
648
649 struct ext4_dir_entry {
650 __le32 inode; /* Inode number */
651 __le16 rec_len; /* Directory entry length */
652 __le16 name_len; /* Name length */
653 char name[EXT4_NAME_LEN]; /* File name */
654 };
655
656 /*
657 * The new version of the directory entry. Since EXT4 structures are
658 * stored in intel byte order, and the name_len field could never be
659 * bigger than 255 chars, it's safe to reclaim the extra byte for the
660 * file_type field.
661 */
662 struct ext4_dir_entry_2 {
663 __le32 inode; /* Inode number */
664 __le16 rec_len; /* Directory entry length */
665 __u8 name_len; /* Name length */
666 __u8 file_type;
667 char name[EXT4_NAME_LEN]; /* File name */
668 };
669
670 /*
671 * Ext4 directory file types. Only the low 3 bits are used. The
672 * other bits are reserved for now.
673 */
674 #define EXT4_FT_UNKNOWN 0
675 #define EXT4_FT_REG_FILE 1
676 #define EXT4_FT_DIR 2
677 #define EXT4_FT_CHRDEV 3
678 #define EXT4_FT_BLKDEV 4
679 #define EXT4_FT_FIFO 5
680 #define EXT4_FT_SOCK 6
681 #define EXT4_FT_SYMLINK 7
682
683 #define EXT4_FT_MAX 8
684
685 /*
686 * EXT4_DIR_PAD defines the directory entries boundaries
687 *
688 * NOTE: It must be a multiple of 4
689 */
690 #define EXT4_DIR_PAD 4
691 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
692 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
693 ~EXT4_DIR_ROUND)
694 /*
695 * Hash Tree Directory indexing
696 * (c) Daniel Phillips, 2001
697 */
698
699 #ifdef CONFIG_EXT4_INDEX
700 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
701 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
702 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
703 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
704 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
705 #else
706 #define is_dx(dir) 0
707 #define EXT4_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT4_LINK_MAX)
708 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
709 #endif
710
711 /* Legal values for the dx_root hash_version field: */
712
713 #define DX_HASH_LEGACY 0
714 #define DX_HASH_HALF_MD4 1
715 #define DX_HASH_TEA 2
716
717 #ifdef __KERNEL__
718
719 /* hash info structure used by the directory hash */
720 struct dx_hash_info
721 {
722 u32 hash;
723 u32 minor_hash;
724 int hash_version;
725 u32 *seed;
726 };
727
728 #define EXT4_HTREE_EOF 0x7fffffff
729
730 /*
731 * Control parameters used by ext4_htree_next_block
732 */
733 #define HASH_NB_ALWAYS 1
734
735
736 /*
737 * Describe an inode's exact location on disk and in memory
738 */
739 struct ext4_iloc
740 {
741 struct buffer_head *bh;
742 unsigned long offset;
743 unsigned long block_group;
744 };
745
746 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
747 {
748 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
749 }
750
751 /*
752 * This structure is stuffed into the struct file's private_data field
753 * for directories. It is where we put information so that we can do
754 * readdir operations in hash tree order.
755 */
756 struct dir_private_info {
757 struct rb_root root;
758 struct rb_node *curr_node;
759 struct fname *extra_fname;
760 loff_t last_pos;
761 __u32 curr_hash;
762 __u32 curr_minor_hash;
763 __u32 next_hash;
764 };
765
766 /* calculate the first block number of the group */
767 static inline ext4_fsblk_t
768 ext4_group_first_block_no(struct super_block *sb, unsigned long group_no)
769 {
770 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
771 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
772 }
773
774 /*
775 * Special error return code only used by dx_probe() and its callers.
776 */
777 #define ERR_BAD_DX_DIR -75000
778
779 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
780 unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
781
782 /*
783 * Function prototypes
784 */
785
786 /*
787 * Ok, these declarations are also in <linux/kernel.h> but none of the
788 * ext4 source programs needs to include it so they are duplicated here.
789 */
790 # define NORET_TYPE /**/
791 # define ATTRIB_NORET __attribute__((noreturn))
792 # define NORET_AND noreturn,
793
794 /* balloc.c */
795 extern unsigned int ext4_block_group(struct super_block *sb,
796 ext4_fsblk_t blocknr);
797 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
798 ext4_fsblk_t blocknr);
799 extern int ext4_bg_has_super(struct super_block *sb, int group);
800 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, int group);
801 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
802 ext4_fsblk_t goal, int *errp);
803 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
804 ext4_fsblk_t goal, unsigned long *count, int *errp);
805 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
806 ext4_fsblk_t block, unsigned long count);
807 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
808 ext4_fsblk_t block, unsigned long count,
809 unsigned long *pdquot_freed_blocks);
810 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
811 extern void ext4_check_blocks_bitmap (struct super_block *);
812 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
813 unsigned int block_group,
814 struct buffer_head ** bh);
815 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
816 extern void ext4_init_block_alloc_info(struct inode *);
817 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
818
819 /* dir.c */
820 extern int ext4_check_dir_entry(const char *, struct inode *,
821 struct ext4_dir_entry_2 *,
822 struct buffer_head *, unsigned long);
823 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
824 __u32 minor_hash,
825 struct ext4_dir_entry_2 *dirent);
826 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
827
828 /* fsync.c */
829 extern int ext4_sync_file (struct file *, struct dentry *, int);
830
831 /* hash.c */
832 extern int ext4fs_dirhash(const char *name, int len, struct
833 dx_hash_info *hinfo);
834
835 /* ialloc.c */
836 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
837 extern void ext4_free_inode (handle_t *, struct inode *);
838 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
839 extern unsigned long ext4_count_free_inodes (struct super_block *);
840 extern unsigned long ext4_count_dirs (struct super_block *);
841 extern void ext4_check_inodes_bitmap (struct super_block *);
842 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
843
844
845 /* inode.c */
846 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
847 struct buffer_head *bh, ext4_fsblk_t blocknr);
848 struct buffer_head * ext4_getblk (handle_t *, struct inode *, long, int, int *);
849 struct buffer_head * ext4_bread (handle_t *, struct inode *, int, int, int *);
850 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
851 sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
852 int create, int extend_disksize);
853
854 extern void ext4_read_inode (struct inode *);
855 extern int ext4_write_inode (struct inode *, int);
856 extern int ext4_setattr (struct dentry *, struct iattr *);
857 extern void ext4_delete_inode (struct inode *);
858 extern int ext4_sync_inode (handle_t *, struct inode *);
859 extern void ext4_discard_reservation (struct inode *);
860 extern void ext4_dirty_inode(struct inode *);
861 extern int ext4_change_inode_journal_flag(struct inode *, int);
862 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
863 extern void ext4_truncate (struct inode *);
864 extern void ext4_set_inode_flags(struct inode *);
865 extern void ext4_set_aops(struct inode *inode);
866 extern int ext4_writepage_trans_blocks(struct inode *);
867 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
868 struct address_space *mapping, loff_t from);
869
870 /* ioctl.c */
871 extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
872 unsigned long);
873 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
874
875 /* namei.c */
876 extern int ext4_orphan_add(handle_t *, struct inode *);
877 extern int ext4_orphan_del(handle_t *, struct inode *);
878 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
879 __u32 start_minor_hash, __u32 *next_hash);
880
881 /* resize.c */
882 extern int ext4_group_add(struct super_block *sb,
883 struct ext4_new_group_data *input);
884 extern int ext4_group_extend(struct super_block *sb,
885 struct ext4_super_block *es,
886 ext4_fsblk_t n_blocks_count);
887
888 /* super.c */
889 extern void ext4_error (struct super_block *, const char *, const char *, ...)
890 __attribute__ ((format (printf, 3, 4)));
891 extern void __ext4_std_error (struct super_block *, const char *, int);
892 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
893 __attribute__ ((format (printf, 3, 4)));
894 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
895 __attribute__ ((format (printf, 3, 4)));
896 extern void ext4_update_dynamic_rev (struct super_block *sb);
897 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
898 struct ext4_group_desc *bg);
899 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
900 struct ext4_group_desc *bg);
901 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
902 struct ext4_group_desc *bg);
903 extern void ext4_block_bitmap_set(struct super_block *sb,
904 struct ext4_group_desc *bg, ext4_fsblk_t blk);
905 extern void ext4_inode_bitmap_set(struct super_block *sb,
906 struct ext4_group_desc *bg, ext4_fsblk_t blk);
907 extern void ext4_inode_table_set(struct super_block *sb,
908 struct ext4_group_desc *bg, ext4_fsblk_t blk);
909
910 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
911 {
912 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
913 le32_to_cpu(es->s_blocks_count);
914 }
915
916 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
917 {
918 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
919 le32_to_cpu(es->s_r_blocks_count);
920 }
921
922 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
923 {
924 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
925 le32_to_cpu(es->s_free_blocks_count);
926 }
927
928 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
929 ext4_fsblk_t blk)
930 {
931 es->s_blocks_count = cpu_to_le32((u32)blk);
932 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
933 }
934
935 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
936 ext4_fsblk_t blk)
937 {
938 es->s_free_blocks_count = cpu_to_le32((u32)blk);
939 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
940 }
941
942 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
943 ext4_fsblk_t blk)
944 {
945 es->s_r_blocks_count = cpu_to_le32((u32)blk);
946 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
947 }
948
949
950
951 #define ext4_std_error(sb, errno) \
952 do { \
953 if ((errno)) \
954 __ext4_std_error((sb), __FUNCTION__, (errno)); \
955 } while (0)
956
957 /*
958 * Inodes and files operations
959 */
960
961 /* dir.c */
962 extern const struct file_operations ext4_dir_operations;
963
964 /* file.c */
965 extern const struct inode_operations ext4_file_inode_operations;
966 extern const struct file_operations ext4_file_operations;
967
968 /* namei.c */
969 extern const struct inode_operations ext4_dir_inode_operations;
970 extern const struct inode_operations ext4_special_inode_operations;
971
972 /* symlink.c */
973 extern const struct inode_operations ext4_symlink_inode_operations;
974 extern const struct inode_operations ext4_fast_symlink_inode_operations;
975
976 /* extents.c */
977 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
978 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
979 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
980 ext4_fsblk_t iblock,
981 unsigned long max_blocks, struct buffer_head *bh_result,
982 int create, int extend_disksize);
983 extern void ext4_ext_truncate(struct inode *, struct page *);
984 extern void ext4_ext_init(struct super_block *);
985 extern void ext4_ext_release(struct super_block *);
986 static inline int
987 ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
988 unsigned long max_blocks, struct buffer_head *bh,
989 int create, int extend_disksize)
990 {
991 if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)
992 return ext4_ext_get_blocks(handle, inode, block, max_blocks,
993 bh, create, extend_disksize);
994 return ext4_get_blocks_handle(handle, inode, block, max_blocks, bh,
995 create, extend_disksize);
996 }
997
998
999 #endif /* __KERNEL__ */
1000
1001 #endif /* _LINUX_EXT4_FS_H */
Linux kernel - Deliverables
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