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[PATCH] Make most file operations structs in fs/ const
[linux.git] / include / linux / ext3_fs.h
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1da177e4
LT		 1/*
2 * linux/include/linux/ext3_fs.h
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card ([email protected])
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_EXT3_FS_H
17#define _LINUX_EXT3_FS_H
18
19#include <linux/types.h>
20#include <linux/ext3_fs_i.h>
21#include <linux/ext3_fs_sb.h>
22
23
24struct statfs;
25
26/*
27 * The second extended filesystem constants/structures
28 */
29
30/*
31 * Define EXT3FS_DEBUG to produce debug messages
32 */
33#undef EXT3FS_DEBUG
34
35/*
36 * Define EXT3_RESERVATION to reserve data blocks for expanding files
37 */
38#define EXT3_DEFAULT_RESERVE_BLOCKS 8
b54e41ec
MC		 39/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
40#define EXT3_MAX_RESERVE_BLOCKS 1027
1da177e4
LT		 41#define EXT3_RESERVE_WINDOW_NOT_ALLOCATED 0
42/*
43 * Always enable hashed directories
44 */
45#define CONFIG_EXT3_INDEX
46
47/*
48 * Debug code
49 */
50#ifdef EXT3FS_DEBUG
51#define ext3_debug(f, a...) \
52 do { \
53 printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:", \
54 __FILE__, __LINE__, __FUNCTION__); \
55 printk (KERN_DEBUG f, ## a); \
56 } while (0)
57#else
58#define ext3_debug(f, a...) do {} while (0)
59#endif
60
61/*
62 * Special inodes numbers
63 */
64#define EXT3_BAD_INO 1 /* Bad blocks inode */
65#define EXT3_ROOT_INO 2 /* Root inode */
66#define EXT3_BOOT_LOADER_INO 5 /* Boot loader inode */
67#define EXT3_UNDEL_DIR_INO 6 /* Undelete directory inode */
68#define EXT3_RESIZE_INO 7 /* Reserved group descriptors inode */
69#define EXT3_JOURNAL_INO 8 /* Journal inode */
70
71/* First non-reserved inode for old ext3 filesystems */
72#define EXT3_GOOD_OLD_FIRST_INO 11
73
74/*
75 * The second extended file system magic number
76 */
77#define EXT3_SUPER_MAGIC 0xEF53
78
79/*
80 * Maximal count of links to a file
81 */
82#define EXT3_LINK_MAX 32000
83
84/*
85 * Macro-instructions used to manage several block sizes
86 */
87#define EXT3_MIN_BLOCK_SIZE 1024
88#define EXT3_MAX_BLOCK_SIZE 4096
89#define EXT3_MIN_BLOCK_LOG_SIZE 10
90#ifdef __KERNEL__
91# define EXT3_BLOCK_SIZE(s) ((s)->s_blocksize)
92#else
93# define EXT3_BLOCK_SIZE(s) (EXT3_MIN_BLOCK_SIZE << (s)->s_log_block_size)
94#endif
95#define EXT3_ADDR_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (__u32))
96#ifdef __KERNEL__
97# define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
98#else
99# define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
100#endif
101#ifdef __KERNEL__
102#define EXT3_ADDR_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_addr_per_block_bits)
103#define EXT3_INODE_SIZE(s) (EXT3_SB(s)->s_inode_size)
104#define EXT3_FIRST_INO(s) (EXT3_SB(s)->s_first_ino)
105#else
106#define EXT3_INODE_SIZE(s) (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
107 EXT3_GOOD_OLD_INODE_SIZE : \
108 (s)->s_inode_size)
109#define EXT3_FIRST_INO(s) (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
110 EXT3_GOOD_OLD_FIRST_INO : \
111 (s)->s_first_ino)
112#endif
113
114/*
115 * Macro-instructions used to manage fragments
116 */
117#define EXT3_MIN_FRAG_SIZE 1024
118#define EXT3_MAX_FRAG_SIZE 4096
119#define EXT3_MIN_FRAG_LOG_SIZE 10
120#ifdef __KERNEL__
121# define EXT3_FRAG_SIZE(s) (EXT3_SB(s)->s_frag_size)
122# define EXT3_FRAGS_PER_BLOCK(s) (EXT3_SB(s)->s_frags_per_block)
123#else
124# define EXT3_FRAG_SIZE(s) (EXT3_MIN_FRAG_SIZE << (s)->s_log_frag_size)
125# define EXT3_FRAGS_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / EXT3_FRAG_SIZE(s))
126#endif
127
128/*
129 * Structure of a blocks group descriptor
130 */
131struct ext3_group_desc
132{
133 __le32 bg_block_bitmap; /* Blocks bitmap block */
134 __le32 bg_inode_bitmap; /* Inodes bitmap block */
135 __le32 bg_inode_table; /* Inodes table block */
136 __le16 bg_free_blocks_count; /* Free blocks count */
137 __le16 bg_free_inodes_count; /* Free inodes count */
138 __le16 bg_used_dirs_count; /* Directories count */
139 __u16 bg_pad;
140 __le32 bg_reserved[3];
141};
142
143/*
144 * Macro-instructions used to manage group descriptors
145 */
146#ifdef __KERNEL__
147# define EXT3_BLOCKS_PER_GROUP(s) (EXT3_SB(s)->s_blocks_per_group)
148# define EXT3_DESC_PER_BLOCK(s) (EXT3_SB(s)->s_desc_per_block)
149# define EXT3_INODES_PER_GROUP(s) (EXT3_SB(s)->s_inodes_per_group)
150# define EXT3_DESC_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_desc_per_block_bits)
151#else
152# define EXT3_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
153# define EXT3_DESC_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (struct ext3_group_desc))
154# define EXT3_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
155#endif
156
157/*
158 * Constants relative to the data blocks
159 */
160#define EXT3_NDIR_BLOCKS 12
161#define EXT3_IND_BLOCK EXT3_NDIR_BLOCKS
162#define EXT3_DIND_BLOCK (EXT3_IND_BLOCK + 1)
163#define EXT3_TIND_BLOCK (EXT3_DIND_BLOCK + 1)
164#define EXT3_N_BLOCKS (EXT3_TIND_BLOCK + 1)
165
166/*
167 * Inode flags
168 */
169#define EXT3_SECRM_FL 0x00000001 /* Secure deletion */
170#define EXT3_UNRM_FL 0x00000002 /* Undelete */
171#define EXT3_COMPR_FL 0x00000004 /* Compress file */
172#define EXT3_SYNC_FL 0x00000008 /* Synchronous updates */
173#define EXT3_IMMUTABLE_FL 0x00000010 /* Immutable file */
174#define EXT3_APPEND_FL 0x00000020 /* writes to file may only append */
175#define EXT3_NODUMP_FL 0x00000040 /* do not dump file */
176#define EXT3_NOATIME_FL 0x00000080 /* do not update atime */
177/* Reserved for compression usage... */
178#define EXT3_DIRTY_FL 0x00000100
179#define EXT3_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
180#define EXT3_NOCOMPR_FL 0x00000400 /* Don't compress */
181#define EXT3_ECOMPR_FL 0x00000800 /* Compression error */
182/* End compression flags --- maybe not all used */
183#define EXT3_INDEX_FL 0x00001000 /* hash-indexed directory */
184#define EXT3_IMAGIC_FL 0x00002000 /* AFS directory */
185#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
186#define EXT3_NOTAIL_FL 0x00008000 /* file tail should not be merged */
187#define EXT3_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
188#define EXT3_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
189#define EXT3_RESERVED_FL 0x80000000 /* reserved for ext3 lib */
190
191#define EXT3_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
192#define EXT3_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
193
194/*
195 * Inode dynamic state flags
196 */
197#define EXT3_STATE_JDATA 0x00000001 /* journaled data exists */
198#define EXT3_STATE_NEW 0x00000002 /* inode is newly created */
199#define EXT3_STATE_XATTR 0x00000004 /* has in-inode xattrs */
200
201/* Used to pass group descriptor data when online resize is done */
202struct ext3_new_group_input {
203 __u32 group; /* Group number for this data */
204 __u32 block_bitmap; /* Absolute block number of block bitmap */
205 __u32 inode_bitmap; /* Absolute block number of inode bitmap */
206 __u32 inode_table; /* Absolute block number of inode table start */
207 __u32 blocks_count; /* Total number of blocks in this group */
208 __u16 reserved_blocks; /* Number of reserved blocks in this group */
209 __u16 unused;
210};
211
212/* The struct ext3_new_group_input in kernel space, with free_blocks_count */
213struct ext3_new_group_data {
214 __u32 group;
215 __u32 block_bitmap;
216 __u32 inode_bitmap;
217 __u32 inode_table;
218 __u32 blocks_count;
219 __u16 reserved_blocks;
220 __u16 unused;
221 __u32 free_blocks_count;
222};
223
224
225/*
226 * ioctl commands
227 */
228#define EXT3_IOC_GETFLAGS _IOR('f', 1, long)
229#define EXT3_IOC_SETFLAGS _IOW('f', 2, long)
230#define EXT3_IOC_GETVERSION _IOR('f', 3, long)
231#define EXT3_IOC_SETVERSION _IOW('f', 4, long)
232#define EXT3_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
233#define EXT3_IOC_GROUP_ADD _IOW('f', 8,struct ext3_new_group_input)
234#define EXT3_IOC_GETVERSION_OLD _IOR('v', 1, long)
235#define EXT3_IOC_SETVERSION_OLD _IOW('v', 2, long)
236#ifdef CONFIG_JBD_DEBUG
237#define EXT3_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
238#endif
239#define EXT3_IOC_GETRSVSZ _IOR('f', 5, long)
240#define EXT3_IOC_SETRSVSZ _IOW('f', 6, long)
241
08c6a96f
JK		 242/*
243 * Mount options
244 */
245struct ext3_mount_options {
246 unsigned long s_mount_opt;
247 uid_t s_resuid;
248 gid_t s_resgid;
249 unsigned long s_commit_interval;
250#ifdef CONFIG_QUOTA
251 int s_jquota_fmt;
252 char *s_qf_names[MAXQUOTAS];
253#endif
254};
255
1da177e4
LT		 256/*
257 * Structure of an inode on the disk
258 */
259struct ext3_inode {
260 __le16 i_mode; /* File mode */
261 __le16 i_uid; /* Low 16 bits of Owner Uid */
262 __le32 i_size; /* Size in bytes */
263 __le32 i_atime; /* Access time */
264 __le32 i_ctime; /* Creation time */
265 __le32 i_mtime; /* Modification time */
266 __le32 i_dtime; /* Deletion Time */
267 __le16 i_gid; /* Low 16 bits of Group Id */
268 __le16 i_links_count; /* Links count */
269 __le32 i_blocks; /* Blocks count */
270 __le32 i_flags; /* File flags */
271 union {
272 struct {
273 __u32 l_i_reserved1;
274 } linux1;
275 struct {
276 __u32 h_i_translator;
277 } hurd1;
278 struct {
279 __u32 m_i_reserved1;
280 } masix1;
281 } osd1; /* OS dependent 1 */
282 __le32 i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
283 __le32 i_generation; /* File version (for NFS) */
284 __le32 i_file_acl; /* File ACL */
285 __le32 i_dir_acl; /* Directory ACL */
286 __le32 i_faddr; /* Fragment address */
287 union {
288 struct {
289 __u8 l_i_frag; /* Fragment number */
290 __u8 l_i_fsize; /* Fragment size */
291 __u16 i_pad1;
292 __le16 l_i_uid_high; /* these 2 fields */
293 __le16 l_i_gid_high; /* were reserved2[0] */
294 __u32 l_i_reserved2;
295 } linux2;
296 struct {
297 __u8 h_i_frag; /* Fragment number */
298 __u8 h_i_fsize; /* Fragment size */
299 __u16 h_i_mode_high;
300 __u16 h_i_uid_high;
301 __u16 h_i_gid_high;
302 __u32 h_i_author;
303 } hurd2;
304 struct {
305 __u8 m_i_frag; /* Fragment number */
306 __u8 m_i_fsize; /* Fragment size */
307 __u16 m_pad1;
308 __u32 m_i_reserved2[2];
309 } masix2;
310 } osd2; /* OS dependent 2 */
311 __le16 i_extra_isize;
312 __le16 i_pad1;
313};
314
315#define i_size_high i_dir_acl
316
317#if defined(__KERNEL__) || defined(__linux__)
318#define i_reserved1 osd1.linux1.l_i_reserved1
319#define i_frag osd2.linux2.l_i_frag
320#define i_fsize osd2.linux2.l_i_fsize
321#define i_uid_low i_uid
322#define i_gid_low i_gid
323#define i_uid_high osd2.linux2.l_i_uid_high
324#define i_gid_high osd2.linux2.l_i_gid_high
325#define i_reserved2 osd2.linux2.l_i_reserved2
326
327#elif defined(__GNU__)
328
329#define i_translator osd1.hurd1.h_i_translator
330#define i_frag osd2.hurd2.h_i_frag;
331#define i_fsize osd2.hurd2.h_i_fsize;
332#define i_uid_high osd2.hurd2.h_i_uid_high
333#define i_gid_high osd2.hurd2.h_i_gid_high
334#define i_author osd2.hurd2.h_i_author
335
336#elif defined(__masix__)
337
338#define i_reserved1 osd1.masix1.m_i_reserved1
339#define i_frag osd2.masix2.m_i_frag
340#define i_fsize osd2.masix2.m_i_fsize
341#define i_reserved2 osd2.masix2.m_i_reserved2
342
343#endif /* defined(__KERNEL__) || defined(__linux__) */
344
345/*
346 * File system states
347 */
348#define EXT3_VALID_FS 0x0001 /* Unmounted cleanly */
349#define EXT3_ERROR_FS 0x0002 /* Errors detected */
350#define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */
351
352/*
353 * Mount flags
354 */
355#define EXT3_MOUNT_CHECK 0x00001 /* Do mount-time checks */
356#define EXT3_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
357#define EXT3_MOUNT_GRPID 0x00004 /* Create files with directory's group */
358#define EXT3_MOUNT_DEBUG 0x00008 /* Some debugging messages */
359#define EXT3_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
360#define EXT3_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
361#define EXT3_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
362#define EXT3_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
363#define EXT3_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
364#define EXT3_MOUNT_ABORT 0x00200 /* Fatal error detected */
365#define EXT3_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
366#define EXT3_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
367#define EXT3_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
368#define EXT3_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
369#define EXT3_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
370#define EXT3_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
371#define EXT3_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
372#define EXT3_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
373#define EXT3_MOUNT_RESERVATION 0x10000 /* Preallocation */
374#define EXT3_MOUNT_BARRIER 0x20000 /* Use block barriers */
375#define EXT3_MOUNT_NOBH 0x40000 /* No bufferheads */
1f54587b 376#define EXT3_MOUNT_QUOTA 0x80000 /* Some quota option set */
8fc2751b
MB		 377#define EXT3_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
378#define EXT3_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
1da177e4
LT		 379
380/* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
381#ifndef _LINUX_EXT2_FS_H
382#define clear_opt(o, opt) o &= ~EXT3_MOUNT_##opt
383#define set_opt(o, opt) o |= EXT3_MOUNT_##opt
384#define test_opt(sb, opt) (EXT3_SB(sb)->s_mount_opt & \
385 EXT3_MOUNT_##opt)
386#else
387#define EXT2_MOUNT_NOLOAD EXT3_MOUNT_NOLOAD
388#define EXT2_MOUNT_ABORT EXT3_MOUNT_ABORT
389#define EXT2_MOUNT_DATA_FLAGS EXT3_MOUNT_DATA_FLAGS
390#endif
391
392#define ext3_set_bit ext2_set_bit
393#define ext3_set_bit_atomic ext2_set_bit_atomic
394#define ext3_clear_bit ext2_clear_bit
395#define ext3_clear_bit_atomic ext2_clear_bit_atomic
396#define ext3_test_bit ext2_test_bit
397#define ext3_find_first_zero_bit ext2_find_first_zero_bit
398#define ext3_find_next_zero_bit ext2_find_next_zero_bit
399
400/*
401 * Maximal mount counts between two filesystem checks
402 */
403#define EXT3_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
404#define EXT3_DFL_CHECKINTERVAL 0 /* Don't use interval check */
405
406/*
407 * Behaviour when detecting errors
408 */
409#define EXT3_ERRORS_CONTINUE 1 /* Continue execution */
410#define EXT3_ERRORS_RO 2 /* Remount fs read-only */
411#define EXT3_ERRORS_PANIC 3 /* Panic */
412#define EXT3_ERRORS_DEFAULT EXT3_ERRORS_CONTINUE
413
414/*
415 * Structure of the super block
416 */
417struct ext3_super_block {
418/*00*/ __le32 s_inodes_count; /* Inodes count */
419 __le32 s_blocks_count; /* Blocks count */
420 __le32 s_r_blocks_count; /* Reserved blocks count */
421 __le32 s_free_blocks_count; /* Free blocks count */
422/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
423 __le32 s_first_data_block; /* First Data Block */
424 __le32 s_log_block_size; /* Block size */
425 __le32 s_log_frag_size; /* Fragment size */
426/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
427 __le32 s_frags_per_group; /* # Fragments per group */
428 __le32 s_inodes_per_group; /* # Inodes per group */
429 __le32 s_mtime; /* Mount time */
430/*30*/ __le32 s_wtime; /* Write time */
431 __le16 s_mnt_count; /* Mount count */
432 __le16 s_max_mnt_count; /* Maximal mount count */
433 __le16 s_magic; /* Magic signature */
434 __le16 s_state; /* File system state */
435 __le16 s_errors; /* Behaviour when detecting errors */
436 __le16 s_minor_rev_level; /* minor revision level */
437/*40*/ __le32 s_lastcheck; /* time of last check */
438 __le32 s_checkinterval; /* max. time between checks */
439 __le32 s_creator_os; /* OS */
440 __le32 s_rev_level; /* Revision level */
441/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
442 __le16 s_def_resgid; /* Default gid for reserved blocks */
443 /*
444 * These fields are for EXT3_DYNAMIC_REV superblocks only.
445 *
446 * Note: the difference between the compatible feature set and
447 * the incompatible feature set is that if there is a bit set
448 * in the incompatible feature set that the kernel doesn't
449 * know about, it should refuse to mount the filesystem.
450 *
451 * e2fsck's requirements are more strict; if it doesn't know
452 * about a feature in either the compatible or incompatible
453 * feature set, it must abort and not try to meddle with
454 * things it doesn't understand...
455 */
456 __le32 s_first_ino; /* First non-reserved inode */
457 __le16 s_inode_size; /* size of inode structure */
458 __le16 s_block_group_nr; /* block group # of this superblock */
459 __le32 s_feature_compat; /* compatible feature set */
460/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
461 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
462/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
463/*78*/ char s_volume_name[16]; /* volume name */
464/*88*/ char s_last_mounted[64]; /* directory where last mounted */
465/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
466 /*
467 * Performance hints. Directory preallocation should only
468 * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
469 */
470 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
471 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
472 __u16 s_reserved_gdt_blocks; /* Per group desc for online growth */
473 /*
474 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
475 */
476/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
477/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
478 __le32 s_journal_dev; /* device number of journal file */
479 __le32 s_last_orphan; /* start of list of inodes to delete */
480 __le32 s_hash_seed[4]; /* HTREE hash seed */
481 __u8 s_def_hash_version; /* Default hash version to use */
482 __u8 s_reserved_char_pad;
483 __u16 s_reserved_word_pad;
484 __le32 s_default_mount_opts;
485 __le32 s_first_meta_bg; /* First metablock block group */
486 __u32 s_reserved[190]; /* Padding to the end of the block */
487};
488
489#ifdef __KERNEL__
490static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
491{
492 return sb->s_fs_info;
493}
494static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
495{
496 return container_of(inode, struct ext3_inode_info, vfs_inode);
497}
498#else
499/* Assume that user mode programs are passing in an ext3fs superblock, not
500 * a kernel struct super_block. This will allow us to call the feature-test
501 * macros from user land. */
502#define EXT3_SB(sb) (sb)
503#endif
504
505#define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
506
507/*
508 * Codes for operating systems
509 */
510#define EXT3_OS_LINUX 0
511#define EXT3_OS_HURD 1
512#define EXT3_OS_MASIX 2
513#define EXT3_OS_FREEBSD 3
514#define EXT3_OS_LITES 4
515
516/*
517 * Revision levels
518 */
519#define EXT3_GOOD_OLD_REV 0 /* The good old (original) format */
520#define EXT3_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
521
522#define EXT3_CURRENT_REV EXT3_GOOD_OLD_REV
523#define EXT3_MAX_SUPP_REV EXT3_DYNAMIC_REV
524
525#define EXT3_GOOD_OLD_INODE_SIZE 128
526
527/*
528 * Feature set definitions
529 */
530
531#define EXT3_HAS_COMPAT_FEATURE(sb,mask) \
532 ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
533#define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask) \
534 ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
535#define EXT3_HAS_INCOMPAT_FEATURE(sb,mask) \
536 ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
537#define EXT3_SET_COMPAT_FEATURE(sb,mask) \
538 EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
539#define EXT3_SET_RO_COMPAT_FEATURE(sb,mask) \
540 EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
541#define EXT3_SET_INCOMPAT_FEATURE(sb,mask) \
542 EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
543#define EXT3_CLEAR_COMPAT_FEATURE(sb,mask) \
544 EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
545#define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
546 EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
547#define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask) \
548 EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
549
550#define EXT3_FEATURE_COMPAT_DIR_PREALLOC 0x0001
551#define EXT3_FEATURE_COMPAT_IMAGIC_INODES 0x0002
552#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
553#define EXT3_FEATURE_COMPAT_EXT_ATTR 0x0008
554#define EXT3_FEATURE_COMPAT_RESIZE_INODE 0x0010
555#define EXT3_FEATURE_COMPAT_DIR_INDEX 0x0020
556
557#define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
558#define EXT3_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
559#define EXT3_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
560
561#define EXT3_FEATURE_INCOMPAT_COMPRESSION 0x0001
562#define EXT3_FEATURE_INCOMPAT_FILETYPE 0x0002
563#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
564#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
565#define EXT3_FEATURE_INCOMPAT_META_BG 0x0010
566
567#define EXT3_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
568#define EXT3_FEATURE_INCOMPAT_SUPP (EXT3_FEATURE_INCOMPAT_FILETYPE| \
569 EXT3_FEATURE_INCOMPAT_RECOVER| \
570 EXT3_FEATURE_INCOMPAT_META_BG)
571#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
572 EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
573 EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
574
575/*
576 * Default values for user and/or group using reserved blocks
577 */
578#define EXT3_DEF_RESUID 0
579#define EXT3_DEF_RESGID 0
580
581/*
582 * Default mount options
583 */
584#define EXT3_DEFM_DEBUG 0x0001
585#define EXT3_DEFM_BSDGROUPS 0x0002
586#define EXT3_DEFM_XATTR_USER 0x0004
587#define EXT3_DEFM_ACL 0x0008
588#define EXT3_DEFM_UID16 0x0010
589#define EXT3_DEFM_JMODE 0x0060
590#define EXT3_DEFM_JMODE_DATA 0x0020
591#define EXT3_DEFM_JMODE_ORDERED 0x0040
592#define EXT3_DEFM_JMODE_WBACK 0x0060
593
594/*
595 * Structure of a directory entry
596 */
597#define EXT3_NAME_LEN 255
598
599struct ext3_dir_entry {
600 __le32 inode; /* Inode number */
601 __le16 rec_len; /* Directory entry length */
602 __le16 name_len; /* Name length */
603 char name[EXT3_NAME_LEN]; /* File name */
604};
605
606/*
607 * The new version of the directory entry. Since EXT3 structures are
608 * stored in intel byte order, and the name_len field could never be
609 * bigger than 255 chars, it's safe to reclaim the extra byte for the
610 * file_type field.
611 */
612struct ext3_dir_entry_2 {
613 __le32 inode; /* Inode number */
614 __le16 rec_len; /* Directory entry length */
615 __u8 name_len; /* Name length */
616 __u8 file_type;
617 char name[EXT3_NAME_LEN]; /* File name */
618};
619
620/*
621 * Ext3 directory file types. Only the low 3 bits are used. The
622 * other bits are reserved for now.
623 */
624#define EXT3_FT_UNKNOWN 0
625#define EXT3_FT_REG_FILE 1
626#define EXT3_FT_DIR 2
627#define EXT3_FT_CHRDEV 3
628#define EXT3_FT_BLKDEV 4
629#define EXT3_FT_FIFO 5
630#define EXT3_FT_SOCK 6
631#define EXT3_FT_SYMLINK 7
632
633#define EXT3_FT_MAX 8
634
635/*
636 * EXT3_DIR_PAD defines the directory entries boundaries
637 *
638 * NOTE: It must be a multiple of 4
639 */
640#define EXT3_DIR_PAD 4
641#define EXT3_DIR_ROUND (EXT3_DIR_PAD - 1)
642#define EXT3_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT3_DIR_ROUND) & \
643 ~EXT3_DIR_ROUND)
644/*
645 * Hash Tree Directory indexing
646 * (c) Daniel Phillips, 2001
647 */
648
649#ifdef CONFIG_EXT3_INDEX
650 #define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
651 EXT3_FEATURE_COMPAT_DIR_INDEX) && \
652 (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
653#define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
654#define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
655#else
656 #define is_dx(dir) 0
657#define EXT3_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT3_LINK_MAX)
658#define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
659#endif
660
661/* Legal values for the dx_root hash_version field: */
662
663#define DX_HASH_LEGACY 0
664#define DX_HASH_HALF_MD4 1
665#define DX_HASH_TEA 2
666
667/* hash info structure used by the directory hash */
668struct dx_hash_info
669{
670 u32 hash;
671 u32 minor_hash;
672 int hash_version;
673 u32 *seed;
674};
675
676#define EXT3_HTREE_EOF 0x7fffffff
677
678#ifdef __KERNEL__
679/*
680 * Control parameters used by ext3_htree_next_block
681 */
682#define HASH_NB_ALWAYS 1
683
684
685/*
686 * Describe an inode's exact location on disk and in memory
687 */
688struct ext3_iloc
689{
690 struct buffer_head *bh;
691 unsigned long offset;
692 unsigned long block_group;
693};
694
695static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
696{
697 return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
698}
699
700/*
701 * This structure is stuffed into the struct file's private_data field
702 * for directories. It is where we put information so that we can do
703 * readdir operations in hash tree order.
704 */
705struct dir_private_info {
706 struct rb_root root;
707 struct rb_node *curr_node;
708 struct fname *extra_fname;
709 loff_t last_pos;
710 __u32 curr_hash;
711 __u32 curr_minor_hash;
712 __u32 next_hash;
713};
714
715/*
716 * Special error return code only used by dx_probe() and its callers.
717 */
718#define ERR_BAD_DX_DIR -75000
719
720/*
721 * Function prototypes
722 */
723
724/*
725 * Ok, these declarations are also in <linux/kernel.h> but none of the
726 * ext3 source programs needs to include it so they are duplicated here.
727 */
728# define NORET_TYPE /**/
729# define ATTRIB_NORET __attribute__((noreturn))
730# define NORET_AND noreturn,
731
732/* balloc.c */
733extern int ext3_bg_has_super(struct super_block *sb, int group);
734extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
735extern int ext3_new_block (handle_t *, struct inode *, unsigned long, int *);
b54e41ec
MC		 736extern int ext3_new_blocks (handle_t *, struct inode *, unsigned long,
737 unsigned long *, int *);
1da177e4
LT		 738extern void ext3_free_blocks (handle_t *, struct inode *, unsigned long,
739 unsigned long);
740extern void ext3_free_blocks_sb (handle_t *, struct super_block *,
741 unsigned long, unsigned long, int *);
742extern unsigned long ext3_count_free_blocks (struct super_block *);
743extern void ext3_check_blocks_bitmap (struct super_block *);
744extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
745 unsigned int block_group,
746 struct buffer_head ** bh);
747extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
748extern void ext3_init_block_alloc_info(struct inode *);
749extern void ext3_rsv_window_add(struct super_block *sb, struct ext3_reserve_window_node *rsv);
750
751/* dir.c */
752extern int ext3_check_dir_entry(const char *, struct inode *,
753 struct ext3_dir_entry_2 *,
754 struct buffer_head *, unsigned long);
755extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
756 __u32 minor_hash,
757 struct ext3_dir_entry_2 *dirent);
758extern void ext3_htree_free_dir_info(struct dir_private_info *p);
759
760/* fsync.c */
761extern int ext3_sync_file (struct file *, struct dentry *, int);
762
763/* hash.c */
764extern int ext3fs_dirhash(const char *name, int len, struct
765 dx_hash_info *hinfo);
766
767/* ialloc.c */
768extern struct inode * ext3_new_inode (handle_t *, struct inode *, int);
769extern void ext3_free_inode (handle_t *, struct inode *);
770extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
771extern unsigned long ext3_count_free_inodes (struct super_block *);
772extern unsigned long ext3_count_dirs (struct super_block *);
773extern void ext3_check_inodes_bitmap (struct super_block *);
774extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
775
776
777/* inode.c */
d8733c29
AM		 778int ext3_forget(handle_t *, int, struct inode *, struct buffer_head *, int);
779struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
780struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
89747d36
MC		 781int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
782 sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
783 int create, int extend_disksize);
1da177e4
LT		 784
785extern void ext3_read_inode (struct inode *);
786extern int ext3_write_inode (struct inode *, int);
787extern int ext3_setattr (struct dentry *, struct iattr *);
788extern void ext3_delete_inode (struct inode *);
789extern int ext3_sync_inode (handle_t *, struct inode *);
790extern void ext3_discard_reservation (struct inode *);
791extern void ext3_dirty_inode(struct inode *);
792extern int ext3_change_inode_journal_flag(struct inode *, int);
793extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *);
794extern void ext3_truncate (struct inode *);
795extern void ext3_set_inode_flags(struct inode *);
796extern void ext3_set_aops(struct inode *inode);
797
798/* ioctl.c */
799extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
800 unsigned long);
801
802/* namei.c */
803extern int ext3_orphan_add(handle_t *, struct inode *);
804extern int ext3_orphan_del(handle_t *, struct inode *);
805extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
806 __u32 start_minor_hash, __u32 *next_hash);
807
808/* resize.c */
809extern int ext3_group_add(struct super_block *sb,
810 struct ext3_new_group_data *input);
811extern int ext3_group_extend(struct super_block *sb,
812 struct ext3_super_block *es,
813 unsigned long n_blocks_count);
814
815/* super.c */
816extern void ext3_error (struct super_block *, const char *, const char *, ...)
817 __attribute__ ((format (printf, 3, 4)));
818extern void __ext3_std_error (struct super_block *, const char *, int);
819extern void ext3_abort (struct super_block *, const char *, const char *, ...)
820 __attribute__ ((format (printf, 3, 4)));
821extern void ext3_warning (struct super_block *, const char *, const char *, ...)
822 __attribute__ ((format (printf, 3, 4)));
823extern void ext3_update_dynamic_rev (struct super_block *sb);
824
825#define ext3_std_error(sb, errno) \
826do { \
827 if ((errno)) \
828 __ext3_std_error((sb), __FUNCTION__, (errno)); \
829} while (0)
830
831/*
832 * Inodes and files operations
833 */
834
835/* dir.c */
4b6f5d20 836extern const struct file_operations ext3_dir_operations;
1da177e4
LT		 837
838/* file.c */
839extern struct inode_operations ext3_file_inode_operations;
4b6f5d20 840extern const struct file_operations ext3_file_operations;
1da177e4
LT		 841
842/* namei.c */
843extern struct inode_operations ext3_dir_inode_operations;
844extern struct inode_operations ext3_special_inode_operations;
845
846/* symlink.c */
847extern struct inode_operations ext3_symlink_inode_operations;
848extern struct inode_operations ext3_fast_symlink_inode_operations;
849
850
851#endif /* __KERNEL__ */
852
853#endif /* _LINUX_EXT3_FS_H */
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