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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright 1996, 1997, 1998 Hans Reiser, see reiserfs/README for licensing and copyright details
3 */
4
5 /* this file has an amazingly stupid
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07006 name, yura please fix it to be
7 reiserfs.h, and merge all the rest
8 of our .h files that are in this
9 directory into it. */
Linus Torvalds1da177e2005-04-16 15:20:36 -070010
11#ifndef _LINUX_REISER_FS_H
12#define _LINUX_REISER_FS_H
13
14#include <linux/types.h>
Jeff Garzike18fa702006-09-24 11:13:19 -040015#include <linux/magic.h>
16
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#ifdef __KERNEL__
18#include <linux/slab.h>
19#include <linux/interrupt.h>
20#include <linux/sched.h>
21#include <linux/workqueue.h>
22#include <asm/unaligned.h>
23#include <linux/bitops.h>
24#include <linux/proc_fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/buffer_head.h>
26#include <linux/reiserfs_fs_i.h>
27#include <linux/reiserfs_fs_sb.h>
28#endif
29
30/*
31 * include/linux/reiser_fs.h
32 *
33 * Reiser File System constants and structures
34 *
35 */
36
Jaswinder Singh Rajput750e1c12009-02-03 19:40:03 +053037/* ioctl's command */
38#define REISERFS_IOC_UNPACK _IOW(0xCD,1,long)
39/* define following flags to be the same as in ext2, so that chattr(1),
40 lsattr(1) will work with us. */
41#define REISERFS_IOC_GETFLAGS FS_IOC_GETFLAGS
42#define REISERFS_IOC_SETFLAGS FS_IOC_SETFLAGS
43#define REISERFS_IOC_GETVERSION FS_IOC_GETVERSION
44#define REISERFS_IOC_SETVERSION FS_IOC_SETVERSION
45
46#ifdef __KERNEL__
47/* the 32 bit compat definitions with int argument */
48#define REISERFS_IOC32_UNPACK _IOW(0xCD, 1, int)
49#define REISERFS_IOC32_GETFLAGS FS_IOC32_GETFLAGS
50#define REISERFS_IOC32_SETFLAGS FS_IOC32_SETFLAGS
51#define REISERFS_IOC32_GETVERSION FS_IOC32_GETVERSION
52#define REISERFS_IOC32_SETVERSION FS_IOC32_SETVERSION
53
Frederic Weisbecker8ebc4232009-04-07 04:19:49 +020054/*
55 * Locking primitives. The write lock is a per superblock
56 * special mutex that has properties close to the Big Kernel Lock
57 * which was used in the previous locking scheme.
58 */
59void reiserfs_write_lock(struct super_block *s);
60void reiserfs_write_unlock(struct super_block *s);
Frederic Weisbeckerdaf88c82009-04-14 05:34:23 +020061int reiserfs_write_lock_once(struct super_block *s);
62void reiserfs_write_unlock_once(struct super_block *s, int lock_depth);
Jaswinder Singh Rajput750e1c12009-02-03 19:40:03 +053063
Frederic Weisbeckerc4a62ca2009-12-30 03:20:19 +010064#ifdef CONFIG_REISERFS_CHECK
65void reiserfs_lock_check_recursive(struct super_block *s);
66#else
67static inline void reiserfs_lock_check_recursive(struct super_block *s) { }
68#endif
69
Frederic Weisbeckere43d3f22009-05-07 22:51:20 +020070/*
Frederic Weisbeckerc72e0572009-05-16 18:12:08 +020071 * Several mutexes depend on the write lock.
72 * However sometimes we want to relax the write lock while we hold
73 * these mutexes, according to the release/reacquire on schedule()
74 * properties of the Bkl that were used.
75 * Reiserfs performances and locking were based on this scheme.
76 * Now that the write lock is a mutex and not the bkl anymore, doing so
77 * may result in a deadlock:
78 *
79 * A acquire write_lock
80 * A acquire j_commit_mutex
81 * A release write_lock and wait for something
82 * B acquire write_lock
83 * B can't acquire j_commit_mutex and sleep
84 * A can't acquire write lock anymore
85 * deadlock
86 *
87 * What we do here is avoiding such deadlock by playing the same game
88 * than the Bkl: if we can't acquire a mutex that depends on the write lock,
89 * we release the write lock, wait a bit and then retry.
90 *
91 * The mutexes concerned by this hack are:
92 * - The commit mutex of a journal list
93 * - The flush mutex
94 * - The journal lock
95 * - The inode mutex
96 */
97static inline void reiserfs_mutex_lock_safe(struct mutex *m,
98 struct super_block *s)
99{
Frederic Weisbeckerc4a62ca2009-12-30 03:20:19 +0100100 reiserfs_lock_check_recursive(s);
Frederic Weisbeckerc72e0572009-05-16 18:12:08 +0200101 reiserfs_write_unlock(s);
102 mutex_lock(m);
103 reiserfs_write_lock(s);
104}
105
Frederic Weisbecker47376ce2009-12-16 23:25:50 +0100106static inline void
107reiserfs_mutex_lock_nested_safe(struct mutex *m, unsigned int subclass,
108 struct super_block *s)
109{
Frederic Weisbeckerc4a62ca2009-12-30 03:20:19 +0100110 reiserfs_lock_check_recursive(s);
Frederic Weisbecker47376ce2009-12-16 23:25:50 +0100111 reiserfs_write_unlock(s);
112 mutex_lock_nested(m, subclass);
113 reiserfs_write_lock(s);
114}
115
Frederic Weisbecker0719d342009-12-30 00:39:22 +0100116static inline void
117reiserfs_down_read_safe(struct rw_semaphore *sem, struct super_block *s)
118{
Frederic Weisbeckerc4a62ca2009-12-30 03:20:19 +0100119 reiserfs_lock_check_recursive(s);
Frederic Weisbecker0719d342009-12-30 00:39:22 +0100120 reiserfs_write_unlock(s);
121 down_read(sem);
122 reiserfs_write_lock(s);
123}
124
Frederic Weisbeckerc72e0572009-05-16 18:12:08 +0200125/*
Frederic Weisbeckere43d3f22009-05-07 22:51:20 +0200126 * When we schedule, we usually want to also release the write lock,
127 * according to the previous bkl based locking scheme of reiserfs.
128 */
129static inline void reiserfs_cond_resched(struct super_block *s)
130{
131 if (need_resched()) {
132 reiserfs_write_unlock(s);
133 schedule();
134 reiserfs_write_lock(s);
135 }
136}
137
Jaswinder Singh Rajput750e1c12009-02-03 19:40:03 +0530138struct fid;
139
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140/* in reading the #defines, it may help to understand that they employ
141 the following abbreviations:
142
143 B = Buffer
144 I = Item header
145 H = Height within the tree (should be changed to LEV)
146 N = Number of the item in the node
147 STAT = stat data
148 DEH = Directory Entry Header
149 EC = Entry Count
150 E = Entry number
151 UL = Unsigned Long
152 BLKH = BLocK Header
153 UNFM = UNForMatted node
154 DC = Disk Child
155 P = Path
156
157 These #defines are named by concatenating these abbreviations,
158 where first comes the arguments, and last comes the return value,
159 of the macro.
160
161*/
162
163#define USE_INODE_GENERATION_COUNTER
164
165#define REISERFS_PREALLOCATE
166#define DISPLACE_NEW_PACKING_LOCALITIES
167#define PREALLOCATION_SIZE 9
168
169/* n must be power of 2 */
170#define _ROUND_UP(x,n) (((x)+(n)-1u) & ~((n)-1u))
171
172// to be ok for alpha and others we have to align structures to 8 byte
173// boundary.
174// FIXME: do not change 4 by anything else: there is code which relies on that
175#define ROUND_UP(x) _ROUND_UP(x,8LL)
176
177/* debug levels. Right now, CONFIG_REISERFS_CHECK means print all debug
178** messages.
179*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700180#define REISERFS_DEBUG_CODE 5 /* extra messages to help find/debug errors */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Jeff Mahoney45b03d52009-03-30 14:02:21 -0400182void __reiserfs_warning(struct super_block *s, const char *id,
183 const char *func, const char *fmt, ...);
184#define reiserfs_warning(s, id, fmt, args...) \
185 __reiserfs_warning(s, id, __func__, fmt, ##args)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186/* assertions handling */
187
188/** always check a condition and panic if it's false. */
Jeff Mahoneyc3a9c212009-03-30 14:02:25 -0400189#define __RASSERT(cond, scond, format, args...) \
190do { \
191 if (!(cond)) \
192 reiserfs_panic(NULL, "assertion failure", "(" #cond ") at " \
193 __FILE__ ":%i:%s: " format "\n", \
194 in_interrupt() ? -1 : task_pid_nr(current), \
195 __LINE__, __func__ , ##args); \
196} while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
Al Viro2d954d02007-07-27 14:23:44 +0100198#define RASSERT(cond, format, args...) __RASSERT(cond, #cond, format, ##args)
199
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200#if defined( CONFIG_REISERFS_CHECK )
Al Viro2d954d02007-07-27 14:23:44 +0100201#define RFALSE(cond, format, args...) __RASSERT(!(cond), "!(" #cond ")", format, ##args)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202#else
203#define RFALSE( cond, format, args... ) do {;} while( 0 )
204#endif
205
206#define CONSTF __attribute_const__
207/*
208 * Disk Data Structures
209 */
210
211/***************************************************************************/
212/* SUPER BLOCK */
213/***************************************************************************/
214
215/*
216 * Structure of super block on disk, a version of which in RAM is often accessed as REISERFS_SB(s)->s_rs
217 * the version in RAM is part of a larger structure containing fields never written to disk.
218 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700219#define UNSET_HASH 0 // read_super will guess about, what hash names
220 // in directories were sorted with
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221#define TEA_HASH 1
222#define YURA_HASH 2
223#define R5_HASH 3
224#define DEFAULT_HASH R5_HASH
225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226struct journal_params {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700227 __le32 jp_journal_1st_block; /* where does journal start from on its
228 * device */
229 __le32 jp_journal_dev; /* journal device st_rdev */
230 __le32 jp_journal_size; /* size of the journal */
231 __le32 jp_journal_trans_max; /* max number of blocks in a transaction. */
232 __le32 jp_journal_magic; /* random value made on fs creation (this
233 * was sb_journal_block_count) */
234 __le32 jp_journal_max_batch; /* max number of blocks to batch into a
235 * trans */
236 __le32 jp_journal_max_commit_age; /* in seconds, how old can an async
237 * commit be */
238 __le32 jp_journal_max_trans_age; /* in seconds, how old can a transaction
239 * be */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240};
241
242/* this is the super from 3.5.X, where X >= 10 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700243struct reiserfs_super_block_v1 {
244 __le32 s_block_count; /* blocks count */
245 __le32 s_free_blocks; /* free blocks count */
246 __le32 s_root_block; /* root block number */
247 struct journal_params s_journal;
248 __le16 s_blocksize; /* block size */
249 __le16 s_oid_maxsize; /* max size of object id array, see
250 * get_objectid() commentary */
251 __le16 s_oid_cursize; /* current size of object id array */
252 __le16 s_umount_state; /* this is set to 1 when filesystem was
253 * umounted, to 2 - when not */
254 char s_magic[10]; /* reiserfs magic string indicates that
255 * file system is reiserfs:
256 * "ReIsErFs" or "ReIsEr2Fs" or "ReIsEr3Fs" */
257 __le16 s_fs_state; /* it is set to used by fsck to mark which
258 * phase of rebuilding is done */
259 __le32 s_hash_function_code; /* indicate, what hash function is being use
260 * to sort names in a directory*/
261 __le16 s_tree_height; /* height of disk tree */
262 __le16 s_bmap_nr; /* amount of bitmap blocks needed to address
263 * each block of file system */
264 __le16 s_version; /* this field is only reliable on filesystem
265 * with non-standard journal */
266 __le16 s_reserved_for_journal; /* size in blocks of journal area on main
267 * device, we need to keep after
268 * making fs with non-standard journal */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269} __attribute__ ((__packed__));
270
271#define SB_SIZE_V1 (sizeof(struct reiserfs_super_block_v1))
272
273/* this is the on disk super block */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700274struct reiserfs_super_block {
275 struct reiserfs_super_block_v1 s_v1;
276 __le32 s_inode_generation;
277 __le32 s_flags; /* Right now used only by inode-attributes, if enabled */
278 unsigned char s_uuid[16]; /* filesystem unique identifier */
279 unsigned char s_label[16]; /* filesystem volume label */
Jeff Mahoney702d21c2009-03-30 14:02:16 -0400280 __le16 s_mnt_count; /* Count of mounts since last fsck */
281 __le16 s_max_mnt_count; /* Maximum mounts before check */
282 __le32 s_lastcheck; /* Timestamp of last fsck */
283 __le32 s_check_interval; /* Interval between checks */
284 char s_unused[76]; /* zero filled by mkreiserfs and
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700285 * reiserfs_convert_objectid_map_v1()
286 * so any additions must be updated
287 * there as well. */
288} __attribute__ ((__packed__));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
290#define SB_SIZE (sizeof(struct reiserfs_super_block))
291
292#define REISERFS_VERSION_1 0
293#define REISERFS_VERSION_2 2
294
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295// on-disk super block fields converted to cpu form
296#define SB_DISK_SUPER_BLOCK(s) (REISERFS_SB(s)->s_rs)
297#define SB_V1_DISK_SUPER_BLOCK(s) (&(SB_DISK_SUPER_BLOCK(s)->s_v1))
298#define SB_BLOCKSIZE(s) \
299 le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_blocksize))
300#define SB_BLOCK_COUNT(s) \
301 le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_block_count))
302#define SB_FREE_BLOCKS(s) \
303 le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_free_blocks))
304#define SB_REISERFS_MAGIC(s) \
305 (SB_V1_DISK_SUPER_BLOCK(s)->s_magic)
306#define SB_ROOT_BLOCK(s) \
307 le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_root_block))
308#define SB_TREE_HEIGHT(s) \
309 le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_tree_height))
310#define SB_REISERFS_STATE(s) \
311 le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_umount_state))
312#define SB_VERSION(s) le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_version))
313#define SB_BMAP_NR(s) le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_bmap_nr))
314
315#define PUT_SB_BLOCK_COUNT(s, val) \
316 do { SB_V1_DISK_SUPER_BLOCK(s)->s_block_count = cpu_to_le32(val); } while (0)
317#define PUT_SB_FREE_BLOCKS(s, val) \
318 do { SB_V1_DISK_SUPER_BLOCK(s)->s_free_blocks = cpu_to_le32(val); } while (0)
319#define PUT_SB_ROOT_BLOCK(s, val) \
320 do { SB_V1_DISK_SUPER_BLOCK(s)->s_root_block = cpu_to_le32(val); } while (0)
321#define PUT_SB_TREE_HEIGHT(s, val) \
322 do { SB_V1_DISK_SUPER_BLOCK(s)->s_tree_height = cpu_to_le16(val); } while (0)
323#define PUT_SB_REISERFS_STATE(s, val) \
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700324 do { SB_V1_DISK_SUPER_BLOCK(s)->s_umount_state = cpu_to_le16(val); } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325#define PUT_SB_VERSION(s, val) \
326 do { SB_V1_DISK_SUPER_BLOCK(s)->s_version = cpu_to_le16(val); } while (0)
327#define PUT_SB_BMAP_NR(s, val) \
328 do { SB_V1_DISK_SUPER_BLOCK(s)->s_bmap_nr = cpu_to_le16 (val); } while (0)
329
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330#define SB_ONDISK_JP(s) (&SB_V1_DISK_SUPER_BLOCK(s)->s_journal)
331#define SB_ONDISK_JOURNAL_SIZE(s) \
332 le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_size))
333#define SB_ONDISK_JOURNAL_1st_BLOCK(s) \
334 le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_1st_block))
335#define SB_ONDISK_JOURNAL_DEVICE(s) \
336 le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_dev))
337#define SB_ONDISK_RESERVED_FOR_JOURNAL(s) \
Al Virob8cc9362005-05-01 08:59:18 -0700338 le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_reserved_for_journal))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
340#define is_block_in_log_or_reserved_area(s, block) \
341 block >= SB_JOURNAL_1st_RESERVED_BLOCK(s) \
342 && block < SB_JOURNAL_1st_RESERVED_BLOCK(s) + \
343 ((!is_reiserfs_jr(SB_DISK_SUPER_BLOCK(s)) ? \
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700344 SB_ONDISK_JOURNAL_SIZE(s) + 1 : SB_ONDISK_RESERVED_FOR_JOURNAL(s)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700346int is_reiserfs_3_5(struct reiserfs_super_block *rs);
347int is_reiserfs_3_6(struct reiserfs_super_block *rs);
348int is_reiserfs_jr(struct reiserfs_super_block *rs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
350/* ReiserFS leaves the first 64k unused, so that partition labels have
351 enough space. If someone wants to write a fancy bootloader that
352 needs more than 64k, let us know, and this will be increased in size.
353 This number must be larger than than the largest block size on any
354 platform, or code will break. -Hans */
355#define REISERFS_DISK_OFFSET_IN_BYTES (64 * 1024)
356#define REISERFS_FIRST_BLOCK unused_define
357#define REISERFS_JOURNAL_OFFSET_IN_BYTES REISERFS_DISK_OFFSET_IN_BYTES
358
359/* the spot for the super in versions 3.5 - 3.5.10 (inclusive) */
360#define REISERFS_OLD_DISK_OFFSET_IN_BYTES (8 * 1024)
361
Davidlohr Bueso7a2e3652010-07-13 05:53:44 -0400362/* reiserfs internal error code (used by search_by_key and fix_nodes)) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363#define CARRY_ON 0
364#define REPEAT_SEARCH -1
365#define IO_ERROR -2
366#define NO_DISK_SPACE -3
367#define NO_BALANCING_NEEDED (-4)
368#define NO_MORE_UNUSED_CONTIGUOUS_BLOCKS (-5)
369#define QUOTA_EXCEEDED -6
370
371typedef __u32 b_blocknr_t;
Al Viro3e8962b2005-05-01 08:59:18 -0700372typedef __le32 unp_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
374struct unfm_nodeinfo {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700375 unp_t unfm_nodenum;
376 unsigned short unfm_freespace;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377};
378
379/* there are two formats of keys: 3.5 and 3.6
380 */
381#define KEY_FORMAT_3_5 0
382#define KEY_FORMAT_3_6 1
383
384/* there are two stat datas */
385#define STAT_DATA_V1 0
386#define STAT_DATA_V2 1
387
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388static inline struct reiserfs_inode_info *REISERFS_I(const struct inode *inode)
389{
390 return container_of(inode, struct reiserfs_inode_info, vfs_inode);
391}
392
393static inline struct reiserfs_sb_info *REISERFS_SB(const struct super_block *sb)
394{
395 return sb->s_fs_info;
396}
397
Jeff Mahoneycb680c12007-10-18 23:39:27 -0700398/* Don't trust REISERFS_SB(sb)->s_bmap_nr, it's a u16
399 * which overflows on large file systems. */
Mike Frysinger13d8bcd262008-02-08 04:21:54 -0800400static inline __u32 reiserfs_bmap_count(struct super_block *sb)
Jeff Mahoneycb680c12007-10-18 23:39:27 -0700401{
402 return (SB_BLOCK_COUNT(sb) - 1) / (sb->s_blocksize * 8) + 1;
403}
404
405static inline int bmap_would_wrap(unsigned bmap_nr)
406{
407 return bmap_nr > ((1LL << 16) - 1);
408}
409
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410/** this says about version of key of all items (but stat data) the
411 object consists of */
412#define get_inode_item_key_version( inode ) \
413 ((REISERFS_I(inode)->i_flags & i_item_key_version_mask) ? KEY_FORMAT_3_6 : KEY_FORMAT_3_5)
414
415#define set_inode_item_key_version( inode, version ) \
416 ({ if((version)==KEY_FORMAT_3_6) \
417 REISERFS_I(inode)->i_flags |= i_item_key_version_mask; \
418 else \
419 REISERFS_I(inode)->i_flags &= ~i_item_key_version_mask; })
420
421#define get_inode_sd_version(inode) \
422 ((REISERFS_I(inode)->i_flags & i_stat_data_version_mask) ? STAT_DATA_V2 : STAT_DATA_V1)
423
424#define set_inode_sd_version(inode, version) \
425 ({ if((version)==STAT_DATA_V2) \
426 REISERFS_I(inode)->i_flags |= i_stat_data_version_mask; \
427 else \
428 REISERFS_I(inode)->i_flags &= ~i_stat_data_version_mask; })
429
430/* This is an aggressive tail suppression policy, I am hoping it
431 improves our benchmarks. The principle behind it is that percentage
432 space saving is what matters, not absolute space saving. This is
433 non-intuitive, but it helps to understand it if you consider that the
434 cost to access 4 blocks is not much more than the cost to access 1
435 block, if you have to do a seek and rotate. A tail risks a
436 non-linear disk access that is significant as a percentage of total
437 time cost for a 4 block file and saves an amount of space that is
438 less significant as a percentage of space, or so goes the hypothesis.
439 -Hans */
440#define STORE_TAIL_IN_UNFM_S1(n_file_size,n_tail_size,n_block_size) \
441(\
442 (!(n_tail_size)) || \
443 (((n_tail_size) > MAX_DIRECT_ITEM_LEN(n_block_size)) || \
444 ( (n_file_size) >= (n_block_size) * 4 ) || \
445 ( ( (n_file_size) >= (n_block_size) * 3 ) && \
446 ( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size))/4) ) || \
447 ( ( (n_file_size) >= (n_block_size) * 2 ) && \
448 ( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size))/2) ) || \
449 ( ( (n_file_size) >= (n_block_size) ) && \
450 ( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size) * 3)/4) ) ) \
451)
452
453/* Another strategy for tails, this one means only create a tail if all the
454 file would fit into one DIRECT item.
455 Primary intention for this one is to increase performance by decreasing
456 seeking.
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700457*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458#define STORE_TAIL_IN_UNFM_S2(n_file_size,n_tail_size,n_block_size) \
459(\
460 (!(n_tail_size)) || \
461 (((n_file_size) > MAX_DIRECT_ITEM_LEN(n_block_size)) ) \
462)
463
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464/*
465 * values for s_umount_state field
466 */
467#define REISERFS_VALID_FS 1
468#define REISERFS_ERROR_FS 2
469
470//
471// there are 5 item types currently
472//
473#define TYPE_STAT_DATA 0
474#define TYPE_INDIRECT 1
475#define TYPE_DIRECT 2
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700476#define TYPE_DIRENTRY 3
477#define TYPE_MAXTYPE 3
478#define TYPE_ANY 15 // FIXME: comment is required
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
480/***************************************************************************/
481/* KEY & ITEM HEAD */
482/***************************************************************************/
483
484//
485// directories use this key as well as old files
486//
487struct offset_v1 {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700488 __le32 k_offset;
489 __le32 k_uniqueness;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490} __attribute__ ((__packed__));
491
492struct offset_v2 {
Al Virof8e08a82005-05-01 08:59:19 -0700493 __le64 v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494} __attribute__ ((__packed__));
495
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700496static inline __u16 offset_v2_k_type(const struct offset_v2 *v2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497{
Al Virof8e08a82005-05-01 08:59:19 -0700498 __u8 type = le64_to_cpu(v2->v) >> 60;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700499 return (type <= TYPE_MAXTYPE) ? type : TYPE_ANY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500}
501
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700502static inline void set_offset_v2_k_type(struct offset_v2 *v2, int type)
503{
504 v2->v =
505 (v2->v & cpu_to_le64(~0ULL >> 4)) | cpu_to_le64((__u64) type << 60);
506}
507
508static inline loff_t offset_v2_k_offset(const struct offset_v2 *v2)
509{
510 return le64_to_cpu(v2->v) & (~0ULL >> 4);
511}
512
513static inline void set_offset_v2_k_offset(struct offset_v2 *v2, loff_t offset)
514{
515 offset &= (~0ULL >> 4);
516 v2->v = (v2->v & cpu_to_le64(15ULL << 60)) | cpu_to_le64(offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
519/* Key of an item determines its location in the S+tree, and
520 is composed of 4 components */
521struct reiserfs_key {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700522 __le32 k_dir_id; /* packing locality: by default parent
523 directory object id */
524 __le32 k_objectid; /* object identifier */
525 union {
526 struct offset_v1 k_offset_v1;
527 struct offset_v2 k_offset_v2;
528 } __attribute__ ((__packed__)) u;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529} __attribute__ ((__packed__));
530
Al Viro6a3a16f2005-05-01 08:59:17 -0700531struct in_core_key {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700532 __u32 k_dir_id; /* packing locality: by default parent
533 directory object id */
534 __u32 k_objectid; /* object identifier */
535 __u64 k_offset;
536 __u8 k_type;
Al Viro6b9f5822005-05-01 08:59:19 -0700537};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
539struct cpu_key {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700540 struct in_core_key on_disk_key;
541 int version;
542 int key_length; /* 3 in all cases but direct2indirect and
543 indirect2direct conversion */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544};
545
546/* Our function for comparing keys can compare keys of different
547 lengths. It takes as a parameter the length of the keys it is to
548 compare. These defines are used in determining what is to be passed
549 to it as that parameter. */
550#define REISERFS_FULL_KEY_LEN 4
551#define REISERFS_SHORT_KEY_LEN 2
552
553/* The result of the key compare */
554#define FIRST_GREATER 1
555#define SECOND_GREATER -1
556#define KEYS_IDENTICAL 0
557#define KEY_FOUND 1
558#define KEY_NOT_FOUND 0
559
560#define KEY_SIZE (sizeof(struct reiserfs_key))
561#define SHORT_KEY_SIZE (sizeof (__u32) + sizeof (__u32))
562
563/* return values for search_by_key and clones */
564#define ITEM_FOUND 1
565#define ITEM_NOT_FOUND 0
566#define ENTRY_FOUND 1
567#define ENTRY_NOT_FOUND 0
568#define DIRECTORY_NOT_FOUND -1
569#define REGULAR_FILE_FOUND -2
570#define DIRECTORY_FOUND -3
571#define BYTE_FOUND 1
572#define BYTE_NOT_FOUND 0
573#define FILE_NOT_FOUND -1
574
575#define POSITION_FOUND 1
576#define POSITION_NOT_FOUND 0
577
578// return values for reiserfs_find_entry and search_by_entry_key
579#define NAME_FOUND 1
580#define NAME_NOT_FOUND 0
581#define GOTO_PREVIOUS_ITEM 2
582#define NAME_FOUND_INVISIBLE 3
583
584/* Everything in the filesystem is stored as a set of items. The
585 item head contains the key of the item, its free space (for
586 indirect items) and specifies the location of the item itself
587 within the block. */
588
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700589struct item_head {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 /* Everything in the tree is found by searching for it based on
591 * its key.*/
592 struct reiserfs_key ih_key;
593 union {
594 /* The free space in the last unformatted node of an
595 indirect item if this is an indirect item. This
596 equals 0xFFFF iff this is a direct item or stat data
597 item. Note that the key, not this field, is used to
598 determine the item type, and thus which field this
599 union contains. */
Al Viro3e8962b2005-05-01 08:59:18 -0700600 __le16 ih_free_space_reserved;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 /* Iff this is a directory item, this field equals the
602 number of directory entries in the directory item. */
Al Viro3e8962b2005-05-01 08:59:18 -0700603 __le16 ih_entry_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 } __attribute__ ((__packed__)) u;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700605 __le16 ih_item_len; /* total size of the item body */
606 __le16 ih_item_location; /* an offset to the item body
607 * within the block */
608 __le16 ih_version; /* 0 for all old items, 2 for new
609 ones. Highest bit is set by fsck
610 temporary, cleaned after all
611 done */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612} __attribute__ ((__packed__));
613/* size of item header */
614#define IH_SIZE (sizeof(struct item_head))
615
616#define ih_free_space(ih) le16_to_cpu((ih)->u.ih_free_space_reserved)
617#define ih_version(ih) le16_to_cpu((ih)->ih_version)
618#define ih_entry_count(ih) le16_to_cpu((ih)->u.ih_entry_count)
619#define ih_location(ih) le16_to_cpu((ih)->ih_item_location)
620#define ih_item_len(ih) le16_to_cpu((ih)->ih_item_len)
621
622#define put_ih_free_space(ih, val) do { (ih)->u.ih_free_space_reserved = cpu_to_le16(val); } while(0)
623#define put_ih_version(ih, val) do { (ih)->ih_version = cpu_to_le16(val); } while (0)
624#define put_ih_entry_count(ih, val) do { (ih)->u.ih_entry_count = cpu_to_le16(val); } while (0)
625#define put_ih_location(ih, val) do { (ih)->ih_item_location = cpu_to_le16(val); } while (0)
626#define put_ih_item_len(ih, val) do { (ih)->ih_item_len = cpu_to_le16(val); } while (0)
627
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628#define unreachable_item(ih) (ih_version(ih) & (1 << 15))
629
630#define get_ih_free_space(ih) (ih_version (ih) == KEY_FORMAT_3_6 ? 0 : ih_free_space (ih))
631#define set_ih_free_space(ih,val) put_ih_free_space((ih), ((ih_version(ih) == KEY_FORMAT_3_6) ? 0 : (val)))
632
633/* these operate on indirect items, where you've got an array of ints
634** at a possibly unaligned location. These are a noop on ia32
635**
636** p is the array of __u32, i is the index into the array, v is the value
637** to store there.
638*/
Harvey Harrison8b5ac312008-07-25 01:45:26 -0700639#define get_block_num(p, i) get_unaligned_le32((p) + (i))
640#define put_block_num(p, i, v) put_unaligned_le32((v), (p) + (i))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
642//
643// in old version uniqueness field shows key type
644//
645#define V1_SD_UNIQUENESS 0
646#define V1_INDIRECT_UNIQUENESS 0xfffffffe
647#define V1_DIRECT_UNIQUENESS 0xffffffff
648#define V1_DIRENTRY_UNIQUENESS 500
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700649#define V1_ANY_UNIQUENESS 555 // FIXME: comment is required
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650
651//
652// here are conversion routines
653//
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700654static inline int uniqueness2type(__u32 uniqueness) CONSTF;
655static inline int uniqueness2type(__u32 uniqueness)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700657 switch ((int)uniqueness) {
658 case V1_SD_UNIQUENESS:
659 return TYPE_STAT_DATA;
660 case V1_INDIRECT_UNIQUENESS:
661 return TYPE_INDIRECT;
662 case V1_DIRECT_UNIQUENESS:
663 return TYPE_DIRECT;
664 case V1_DIRENTRY_UNIQUENESS:
665 return TYPE_DIRENTRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 case V1_ANY_UNIQUENESS:
Jeff Mahoneyfd7cb032009-03-30 14:02:23 -0400667 default:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700668 return TYPE_ANY;
669 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670}
671
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700672static inline __u32 type2uniqueness(int type) CONSTF;
673static inline __u32 type2uniqueness(int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700675 switch (type) {
676 case TYPE_STAT_DATA:
677 return V1_SD_UNIQUENESS;
678 case TYPE_INDIRECT:
679 return V1_INDIRECT_UNIQUENESS;
680 case TYPE_DIRECT:
681 return V1_DIRECT_UNIQUENESS;
682 case TYPE_DIRENTRY:
683 return V1_DIRENTRY_UNIQUENESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 case TYPE_ANY:
Jeff Mahoneyfd7cb032009-03-30 14:02:23 -0400685 default:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700686 return V1_ANY_UNIQUENESS;
687 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688}
689
690//
691// key is pointer to on disk key which is stored in le, result is cpu,
692// there is no way to get version of object from key, so, provide
693// version to these defines
694//
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700695static inline loff_t le_key_k_offset(int version,
696 const struct reiserfs_key *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700698 return (version == KEY_FORMAT_3_5) ?
699 le32_to_cpu(key->u.k_offset_v1.k_offset) :
700 offset_v2_k_offset(&(key->u.k_offset_v2));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701}
702
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700703static inline loff_t le_ih_k_offset(const struct item_head *ih)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700705 return le_key_k_offset(ih_version(ih), &(ih->ih_key));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706}
707
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700708static inline loff_t le_key_k_type(int version, const struct reiserfs_key *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700710 return (version == KEY_FORMAT_3_5) ?
711 uniqueness2type(le32_to_cpu(key->u.k_offset_v1.k_uniqueness)) :
712 offset_v2_k_type(&(key->u.k_offset_v2));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713}
714
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700715static inline loff_t le_ih_k_type(const struct item_head *ih)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700717 return le_key_k_type(ih_version(ih), &(ih->ih_key));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718}
719
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700720static inline void set_le_key_k_offset(int version, struct reiserfs_key *key,
721 loff_t offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700723 (version == KEY_FORMAT_3_5) ? (void)(key->u.k_offset_v1.k_offset = cpu_to_le32(offset)) : /* jdm check */
724 (void)(set_offset_v2_k_offset(&(key->u.k_offset_v2), offset));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725}
726
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700727static inline void set_le_ih_k_offset(struct item_head *ih, loff_t offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700729 set_le_key_k_offset(ih_version(ih), &(ih->ih_key), offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730}
731
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700732static inline void set_le_key_k_type(int version, struct reiserfs_key *key,
733 int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700735 (version == KEY_FORMAT_3_5) ?
736 (void)(key->u.k_offset_v1.k_uniqueness =
737 cpu_to_le32(type2uniqueness(type)))
738 : (void)(set_offset_v2_k_type(&(key->u.k_offset_v2), type));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739}
Jeff Mahoney1d965fe2009-06-17 16:26:29 -0700740
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700741static inline void set_le_ih_k_type(struct item_head *ih, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700743 set_le_key_k_type(ih_version(ih), &(ih->ih_key), type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744}
745
Jeff Mahoney1d965fe2009-06-17 16:26:29 -0700746static inline int is_direntry_le_key(int version, struct reiserfs_key *key)
747{
748 return le_key_k_type(version, key) == TYPE_DIRENTRY;
749}
750
751static inline int is_direct_le_key(int version, struct reiserfs_key *key)
752{
753 return le_key_k_type(version, key) == TYPE_DIRECT;
754}
755
756static inline int is_indirect_le_key(int version, struct reiserfs_key *key)
757{
758 return le_key_k_type(version, key) == TYPE_INDIRECT;
759}
760
761static inline int is_statdata_le_key(int version, struct reiserfs_key *key)
762{
763 return le_key_k_type(version, key) == TYPE_STAT_DATA;
764}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765
766//
767// item header has version.
768//
Jeff Mahoney1d965fe2009-06-17 16:26:29 -0700769static inline int is_direntry_le_ih(struct item_head *ih)
770{
771 return is_direntry_le_key(ih_version(ih), &ih->ih_key);
772}
773
774static inline int is_direct_le_ih(struct item_head *ih)
775{
776 return is_direct_le_key(ih_version(ih), &ih->ih_key);
777}
778
779static inline int is_indirect_le_ih(struct item_head *ih)
780{
781 return is_indirect_le_key(ih_version(ih), &ih->ih_key);
782}
783
784static inline int is_statdata_le_ih(struct item_head *ih)
785{
786 return is_statdata_le_key(ih_version(ih), &ih->ih_key);
787}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789//
790// key is pointer to cpu key, result is cpu
791//
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700792static inline loff_t cpu_key_k_offset(const struct cpu_key *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700794 return key->on_disk_key.k_offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795}
796
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700797static inline loff_t cpu_key_k_type(const struct cpu_key *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700799 return key->on_disk_key.k_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800}
801
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700802static inline void set_cpu_key_k_offset(struct cpu_key *key, loff_t offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803{
Al Viro6b9f5822005-05-01 08:59:19 -0700804 key->on_disk_key.k_offset = offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805}
806
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700807static inline void set_cpu_key_k_type(struct cpu_key *key, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808{
Al Viro6b9f5822005-05-01 08:59:19 -0700809 key->on_disk_key.k_type = type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810}
811
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700812static inline void cpu_key_k_offset_dec(struct cpu_key *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700814 key->on_disk_key.k_offset--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815}
816
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817#define is_direntry_cpu_key(key) (cpu_key_k_type (key) == TYPE_DIRENTRY)
818#define is_direct_cpu_key(key) (cpu_key_k_type (key) == TYPE_DIRECT)
819#define is_indirect_cpu_key(key) (cpu_key_k_type (key) == TYPE_INDIRECT)
820#define is_statdata_cpu_key(key) (cpu_key_k_type (key) == TYPE_STAT_DATA)
821
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822/* are these used ? */
823#define is_direntry_cpu_ih(ih) (is_direntry_cpu_key (&((ih)->ih_key)))
824#define is_direct_cpu_ih(ih) (is_direct_cpu_key (&((ih)->ih_key)))
825#define is_indirect_cpu_ih(ih) (is_indirect_cpu_key (&((ih)->ih_key)))
826#define is_statdata_cpu_ih(ih) (is_statdata_cpu_key (&((ih)->ih_key)))
827
Jeff Mahoneyd68caa92009-03-30 14:02:49 -0400828#define I_K_KEY_IN_ITEM(ih, key, n_blocksize) \
829 (!COMP_SHORT_KEYS(ih, key) && \
830 I_OFF_BYTE_IN_ITEM(ih, k_offset(key), n_blocksize))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700832/* maximal length of item */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833#define MAX_ITEM_LEN(block_size) (block_size - BLKH_SIZE - IH_SIZE)
834#define MIN_ITEM_LEN 1
835
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836/* object identifier for root dir */
837#define REISERFS_ROOT_OBJECTID 2
838#define REISERFS_ROOT_PARENT_OBJECTID 1
Jaswinder Singh Rajput750e1c12009-02-03 19:40:03 +0530839
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840extern struct reiserfs_key root_key;
841
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842/*
843 * Picture represents a leaf of the S+tree
844 * ______________________________________________________
845 * | | Array of | | |
846 * |Block | Object-Item | F r e e | Objects- |
847 * | head | Headers | S p a c e | Items |
848 * |______|_______________|___________________|___________|
849 */
850
851/* Header of a disk block. More precisely, header of a formatted leaf
852 or internal node, and not the header of an unformatted node. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700853struct block_head {
854 __le16 blk_level; /* Level of a block in the tree. */
855 __le16 blk_nr_item; /* Number of keys/items in a block. */
856 __le16 blk_free_space; /* Block free space in bytes. */
857 __le16 blk_reserved;
858 /* dump this in v4/planA */
859 struct reiserfs_key blk_right_delim_key; /* kept only for compatibility */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860};
861
862#define BLKH_SIZE (sizeof(struct block_head))
863#define blkh_level(p_blkh) (le16_to_cpu((p_blkh)->blk_level))
864#define blkh_nr_item(p_blkh) (le16_to_cpu((p_blkh)->blk_nr_item))
865#define blkh_free_space(p_blkh) (le16_to_cpu((p_blkh)->blk_free_space))
866#define blkh_reserved(p_blkh) (le16_to_cpu((p_blkh)->blk_reserved))
867#define set_blkh_level(p_blkh,val) ((p_blkh)->blk_level = cpu_to_le16(val))
868#define set_blkh_nr_item(p_blkh,val) ((p_blkh)->blk_nr_item = cpu_to_le16(val))
869#define set_blkh_free_space(p_blkh,val) ((p_blkh)->blk_free_space = cpu_to_le16(val))
870#define set_blkh_reserved(p_blkh,val) ((p_blkh)->blk_reserved = cpu_to_le16(val))
871#define blkh_right_delim_key(p_blkh) ((p_blkh)->blk_right_delim_key)
872#define set_blkh_right_delim_key(p_blkh,val) ((p_blkh)->blk_right_delim_key = val)
873
874/*
875 * values for blk_level field of the struct block_head
876 */
877
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700878#define FREE_LEVEL 0 /* when node gets removed from the tree its
879 blk_level is set to FREE_LEVEL. It is then
880 used to see whether the node is still in the
881 tree */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700883#define DISK_LEAF_NODE_LEVEL 1 /* Leaf node level. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884
885/* Given the buffer head of a formatted node, resolve to the block head of that node. */
Jeff Mahoneyad31a4f2009-03-30 14:02:46 -0400886#define B_BLK_HEAD(bh) ((struct block_head *)((bh)->b_data))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887/* Number of items that are in buffer. */
Jeff Mahoneyad31a4f2009-03-30 14:02:46 -0400888#define B_NR_ITEMS(bh) (blkh_nr_item(B_BLK_HEAD(bh)))
889#define B_LEVEL(bh) (blkh_level(B_BLK_HEAD(bh)))
890#define B_FREE_SPACE(bh) (blkh_free_space(B_BLK_HEAD(bh)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891
Jeff Mahoneyad31a4f2009-03-30 14:02:46 -0400892#define PUT_B_NR_ITEMS(bh, val) do { set_blkh_nr_item(B_BLK_HEAD(bh), val); } while (0)
893#define PUT_B_LEVEL(bh, val) do { set_blkh_level(B_BLK_HEAD(bh), val); } while (0)
894#define PUT_B_FREE_SPACE(bh, val) do { set_blkh_free_space(B_BLK_HEAD(bh), val); } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896/* Get right delimiting key. -- little endian */
Jeff Mahoneyad31a4f2009-03-30 14:02:46 -0400897#define B_PRIGHT_DELIM_KEY(bh) (&(blk_right_delim_key(B_BLK_HEAD(bh))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
899/* Does the buffer contain a disk leaf. */
Jeff Mahoneyad31a4f2009-03-30 14:02:46 -0400900#define B_IS_ITEMS_LEVEL(bh) (B_LEVEL(bh) == DISK_LEAF_NODE_LEVEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901
902/* Does the buffer contain a disk internal node */
Jeff Mahoneyad31a4f2009-03-30 14:02:46 -0400903#define B_IS_KEYS_LEVEL(bh) (B_LEVEL(bh) > DISK_LEAF_NODE_LEVEL \
904 && B_LEVEL(bh) <= MAX_HEIGHT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906/***************************************************************************/
907/* STAT DATA */
908/***************************************************************************/
909
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910//
911// old stat data is 32 bytes long. We are going to distinguish new one by
912// different size
913//
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700914struct stat_data_v1 {
915 __le16 sd_mode; /* file type, permissions */
916 __le16 sd_nlink; /* number of hard links */
917 __le16 sd_uid; /* owner */
918 __le16 sd_gid; /* group */
919 __le32 sd_size; /* file size */
920 __le32 sd_atime; /* time of last access */
921 __le32 sd_mtime; /* time file was last modified */
922 __le32 sd_ctime; /* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */
923 union {
924 __le32 sd_rdev;
925 __le32 sd_blocks; /* number of blocks file uses */
926 } __attribute__ ((__packed__)) u;
927 __le32 sd_first_direct_byte; /* first byte of file which is stored
928 in a direct item: except that if it
929 equals 1 it is a symlink and if it
930 equals ~(__u32)0 there is no
931 direct item. The existence of this
932 field really grates on me. Let's
933 replace it with a macro based on
934 sd_size and our tail suppression
935 policy. Someday. -Hans */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936} __attribute__ ((__packed__));
937
938#define SD_V1_SIZE (sizeof(struct stat_data_v1))
939#define stat_data_v1(ih) (ih_version (ih) == KEY_FORMAT_3_5)
940#define sd_v1_mode(sdp) (le16_to_cpu((sdp)->sd_mode))
941#define set_sd_v1_mode(sdp,v) ((sdp)->sd_mode = cpu_to_le16(v))
942#define sd_v1_nlink(sdp) (le16_to_cpu((sdp)->sd_nlink))
943#define set_sd_v1_nlink(sdp,v) ((sdp)->sd_nlink = cpu_to_le16(v))
944#define sd_v1_uid(sdp) (le16_to_cpu((sdp)->sd_uid))
945#define set_sd_v1_uid(sdp,v) ((sdp)->sd_uid = cpu_to_le16(v))
946#define sd_v1_gid(sdp) (le16_to_cpu((sdp)->sd_gid))
947#define set_sd_v1_gid(sdp,v) ((sdp)->sd_gid = cpu_to_le16(v))
948#define sd_v1_size(sdp) (le32_to_cpu((sdp)->sd_size))
949#define set_sd_v1_size(sdp,v) ((sdp)->sd_size = cpu_to_le32(v))
950#define sd_v1_atime(sdp) (le32_to_cpu((sdp)->sd_atime))
951#define set_sd_v1_atime(sdp,v) ((sdp)->sd_atime = cpu_to_le32(v))
952#define sd_v1_mtime(sdp) (le32_to_cpu((sdp)->sd_mtime))
953#define set_sd_v1_mtime(sdp,v) ((sdp)->sd_mtime = cpu_to_le32(v))
954#define sd_v1_ctime(sdp) (le32_to_cpu((sdp)->sd_ctime))
955#define set_sd_v1_ctime(sdp,v) ((sdp)->sd_ctime = cpu_to_le32(v))
956#define sd_v1_rdev(sdp) (le32_to_cpu((sdp)->u.sd_rdev))
957#define set_sd_v1_rdev(sdp,v) ((sdp)->u.sd_rdev = cpu_to_le32(v))
958#define sd_v1_blocks(sdp) (le32_to_cpu((sdp)->u.sd_blocks))
959#define set_sd_v1_blocks(sdp,v) ((sdp)->u.sd_blocks = cpu_to_le32(v))
960#define sd_v1_first_direct_byte(sdp) \
961 (le32_to_cpu((sdp)->sd_first_direct_byte))
962#define set_sd_v1_first_direct_byte(sdp,v) \
963 ((sdp)->sd_first_direct_byte = cpu_to_le32(v))
964
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965/* inode flags stored in sd_attrs (nee sd_reserved) */
966
967/* we want common flags to have the same values as in ext2,
968 so chattr(1) will work without problems */
David Howells36695672006-08-29 19:06:16 +0100969#define REISERFS_IMMUTABLE_FL FS_IMMUTABLE_FL
970#define REISERFS_APPEND_FL FS_APPEND_FL
971#define REISERFS_SYNC_FL FS_SYNC_FL
972#define REISERFS_NOATIME_FL FS_NOATIME_FL
973#define REISERFS_NODUMP_FL FS_NODUMP_FL
974#define REISERFS_SECRM_FL FS_SECRM_FL
975#define REISERFS_UNRM_FL FS_UNRM_FL
976#define REISERFS_COMPR_FL FS_COMPR_FL
977#define REISERFS_NOTAIL_FL FS_NOTAIL_FL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978
979/* persistent flags that file inherits from the parent directory */
980#define REISERFS_INHERIT_MASK ( REISERFS_IMMUTABLE_FL | \
981 REISERFS_SYNC_FL | \
982 REISERFS_NOATIME_FL | \
983 REISERFS_NODUMP_FL | \
984 REISERFS_SECRM_FL | \
985 REISERFS_COMPR_FL | \
986 REISERFS_NOTAIL_FL )
987
988/* Stat Data on disk (reiserfs version of UFS disk inode minus the
989 address blocks) */
990struct stat_data {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700991 __le16 sd_mode; /* file type, permissions */
992 __le16 sd_attrs; /* persistent inode flags */
993 __le32 sd_nlink; /* number of hard links */
994 __le64 sd_size; /* file size */
995 __le32 sd_uid; /* owner */
996 __le32 sd_gid; /* group */
997 __le32 sd_atime; /* time of last access */
998 __le32 sd_mtime; /* time file was last modified */
999 __le32 sd_ctime; /* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */
1000 __le32 sd_blocks;
1001 union {
1002 __le32 sd_rdev;
1003 __le32 sd_generation;
1004 //__le32 sd_first_direct_byte;
1005 /* first byte of file which is stored in a
1006 direct item: except that if it equals 1
1007 it is a symlink and if it equals
1008 ~(__u32)0 there is no direct item. The
1009 existence of this field really grates
1010 on me. Let's replace it with a macro
1011 based on sd_size and our tail
1012 suppression policy? */
1013 } __attribute__ ((__packed__)) u;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014} __attribute__ ((__packed__));
1015//
1016// this is 44 bytes long
1017//
1018#define SD_SIZE (sizeof(struct stat_data))
1019#define SD_V2_SIZE SD_SIZE
1020#define stat_data_v2(ih) (ih_version (ih) == KEY_FORMAT_3_6)
1021#define sd_v2_mode(sdp) (le16_to_cpu((sdp)->sd_mode))
1022#define set_sd_v2_mode(sdp,v) ((sdp)->sd_mode = cpu_to_le16(v))
1023/* sd_reserved */
1024/* set_sd_reserved */
1025#define sd_v2_nlink(sdp) (le32_to_cpu((sdp)->sd_nlink))
1026#define set_sd_v2_nlink(sdp,v) ((sdp)->sd_nlink = cpu_to_le32(v))
1027#define sd_v2_size(sdp) (le64_to_cpu((sdp)->sd_size))
1028#define set_sd_v2_size(sdp,v) ((sdp)->sd_size = cpu_to_le64(v))
1029#define sd_v2_uid(sdp) (le32_to_cpu((sdp)->sd_uid))
1030#define set_sd_v2_uid(sdp,v) ((sdp)->sd_uid = cpu_to_le32(v))
1031#define sd_v2_gid(sdp) (le32_to_cpu((sdp)->sd_gid))
1032#define set_sd_v2_gid(sdp,v) ((sdp)->sd_gid = cpu_to_le32(v))
1033#define sd_v2_atime(sdp) (le32_to_cpu((sdp)->sd_atime))
1034#define set_sd_v2_atime(sdp,v) ((sdp)->sd_atime = cpu_to_le32(v))
1035#define sd_v2_mtime(sdp) (le32_to_cpu((sdp)->sd_mtime))
1036#define set_sd_v2_mtime(sdp,v) ((sdp)->sd_mtime = cpu_to_le32(v))
1037#define sd_v2_ctime(sdp) (le32_to_cpu((sdp)->sd_ctime))
1038#define set_sd_v2_ctime(sdp,v) ((sdp)->sd_ctime = cpu_to_le32(v))
1039#define sd_v2_blocks(sdp) (le32_to_cpu((sdp)->sd_blocks))
1040#define set_sd_v2_blocks(sdp,v) ((sdp)->sd_blocks = cpu_to_le32(v))
1041#define sd_v2_rdev(sdp) (le32_to_cpu((sdp)->u.sd_rdev))
1042#define set_sd_v2_rdev(sdp,v) ((sdp)->u.sd_rdev = cpu_to_le32(v))
1043#define sd_v2_generation(sdp) (le32_to_cpu((sdp)->u.sd_generation))
1044#define set_sd_v2_generation(sdp,v) ((sdp)->u.sd_generation = cpu_to_le32(v))
1045#define sd_v2_attrs(sdp) (le16_to_cpu((sdp)->sd_attrs))
1046#define set_sd_v2_attrs(sdp,v) ((sdp)->sd_attrs = cpu_to_le16(v))
1047
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048/***************************************************************************/
1049/* DIRECTORY STRUCTURE */
1050/***************************************************************************/
1051/*
1052 Picture represents the structure of directory items
1053 ________________________________________________
1054 | Array of | | | | | |
1055 | directory |N-1| N-2 | .... | 1st |0th|
1056 | entry headers | | | | | |
1057 |_______________|___|_____|________|_______|___|
1058 <---- directory entries ------>
1059
1060 First directory item has k_offset component 1. We store "." and ".."
1061 in one item, always, we never split "." and ".." into differing
1062 items. This makes, among other things, the code for removing
1063 directories simpler. */
1064#define SD_OFFSET 0
1065#define SD_UNIQUENESS 0
1066#define DOT_OFFSET 1
1067#define DOT_DOT_OFFSET 2
1068#define DIRENTRY_UNIQUENESS 500
1069
1070/* */
1071#define FIRST_ITEM_OFFSET 1
1072
1073/*
1074 Q: How to get key of object pointed to by entry from entry?
1075
1076 A: Each directory entry has its header. This header has deh_dir_id and deh_objectid fields, those are key
1077 of object, entry points to */
1078
1079/* NOT IMPLEMENTED:
1080 Directory will someday contain stat data of object */
1081
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001082struct reiserfs_de_head {
1083 __le32 deh_offset; /* third component of the directory entry key */
1084 __le32 deh_dir_id; /* objectid of the parent directory of the object, that is referenced
1085 by directory entry */
1086 __le32 deh_objectid; /* objectid of the object, that is referenced by directory entry */
1087 __le16 deh_location; /* offset of name in the whole item */
1088 __le16 deh_state; /* whether 1) entry contains stat data (for future), and 2) whether
1089 entry is hidden (unlinked) */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090} __attribute__ ((__packed__));
1091#define DEH_SIZE sizeof(struct reiserfs_de_head)
1092#define deh_offset(p_deh) (le32_to_cpu((p_deh)->deh_offset))
1093#define deh_dir_id(p_deh) (le32_to_cpu((p_deh)->deh_dir_id))
1094#define deh_objectid(p_deh) (le32_to_cpu((p_deh)->deh_objectid))
1095#define deh_location(p_deh) (le16_to_cpu((p_deh)->deh_location))
1096#define deh_state(p_deh) (le16_to_cpu((p_deh)->deh_state))
1097
1098#define put_deh_offset(p_deh,v) ((p_deh)->deh_offset = cpu_to_le32((v)))
1099#define put_deh_dir_id(p_deh,v) ((p_deh)->deh_dir_id = cpu_to_le32((v)))
1100#define put_deh_objectid(p_deh,v) ((p_deh)->deh_objectid = cpu_to_le32((v)))
1101#define put_deh_location(p_deh,v) ((p_deh)->deh_location = cpu_to_le16((v)))
1102#define put_deh_state(p_deh,v) ((p_deh)->deh_state = cpu_to_le16((v)))
1103
1104/* empty directory contains two entries "." and ".." and their headers */
1105#define EMPTY_DIR_SIZE \
1106(DEH_SIZE * 2 + ROUND_UP (strlen (".")) + ROUND_UP (strlen ("..")))
1107
1108/* old format directories have this size when empty */
1109#define EMPTY_DIR_SIZE_V1 (DEH_SIZE * 2 + 3)
1110
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001111#define DEH_Statdata 0 /* not used now */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112#define DEH_Visible 2
1113
1114/* 64 bit systems (and the S/390) need to be aligned explicitly -jdm */
1115#if BITS_PER_LONG == 64 || defined(__s390__) || defined(__hppa__)
1116# define ADDR_UNALIGNED_BITS (3)
1117#endif
1118
1119/* These are only used to manipulate deh_state.
1120 * Because of this, we'll use the ext2_ bit routines,
1121 * since they are little endian */
1122#ifdef ADDR_UNALIGNED_BITS
1123
1124# define aligned_address(addr) ((void *)((long)(addr) & ~((1UL << ADDR_UNALIGNED_BITS) - 1)))
1125# define unaligned_offset(addr) (((int)((long)(addr) & ((1 << ADDR_UNALIGNED_BITS) - 1))) << 3)
1126
1127# define set_bit_unaligned(nr, addr) ext2_set_bit((nr) + unaligned_offset(addr), aligned_address(addr))
1128# define clear_bit_unaligned(nr, addr) ext2_clear_bit((nr) + unaligned_offset(addr), aligned_address(addr))
1129# define test_bit_unaligned(nr, addr) ext2_test_bit((nr) + unaligned_offset(addr), aligned_address(addr))
1130
1131#else
1132
1133# define set_bit_unaligned(nr, addr) ext2_set_bit(nr, addr)
1134# define clear_bit_unaligned(nr, addr) ext2_clear_bit(nr, addr)
1135# define test_bit_unaligned(nr, addr) ext2_test_bit(nr, addr)
1136
1137#endif
1138
1139#define mark_de_with_sd(deh) set_bit_unaligned (DEH_Statdata, &((deh)->deh_state))
1140#define mark_de_without_sd(deh) clear_bit_unaligned (DEH_Statdata, &((deh)->deh_state))
1141#define mark_de_visible(deh) set_bit_unaligned (DEH_Visible, &((deh)->deh_state))
1142#define mark_de_hidden(deh) clear_bit_unaligned (DEH_Visible, &((deh)->deh_state))
1143
1144#define de_with_sd(deh) test_bit_unaligned (DEH_Statdata, &((deh)->deh_state))
1145#define de_visible(deh) test_bit_unaligned (DEH_Visible, &((deh)->deh_state))
1146#define de_hidden(deh) !test_bit_unaligned (DEH_Visible, &((deh)->deh_state))
1147
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001148extern void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid,
1149 __le32 par_dirid, __le32 par_objid);
1150extern void make_empty_dir_item(char *body, __le32 dirid, __le32 objid,
1151 __le32 par_dirid, __le32 par_objid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152
1153/* array of the entry headers */
1154 /* get item body */
1155#define B_I_PITEM(bh,ih) ( (bh)->b_data + ih_location(ih) )
1156#define B_I_DEH(bh,ih) ((struct reiserfs_de_head *)(B_I_PITEM(bh,ih)))
1157
1158/* length of the directory entry in directory item. This define
1159 calculates length of i-th directory entry using directory entry
1160 locations from dir entry head. When it calculates length of 0-th
1161 directory entry, it uses length of whole item in place of entry
1162 location of the non-existent following entry in the calculation.
1163 See picture above.*/
1164/*
1165#define I_DEH_N_ENTRY_LENGTH(ih,deh,i) \
1166((i) ? (deh_location((deh)-1) - deh_location((deh))) : (ih_item_len((ih)) - deh_location((deh))))
1167*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001168static inline int entry_length(const struct buffer_head *bh,
1169 const struct item_head *ih, int pos_in_item)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001171 struct reiserfs_de_head *deh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001173 deh = B_I_DEH(bh, ih) + pos_in_item;
1174 if (pos_in_item)
1175 return deh_location(deh - 1) - deh_location(deh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001177 return ih_item_len(ih) - deh_location(deh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178}
1179
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180/* number of entries in the directory item, depends on ENTRY_COUNT being at the start of directory dynamic data. */
1181#define I_ENTRY_COUNT(ih) (ih_entry_count((ih)))
1182
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183/* name by bh, ih and entry_num */
1184#define B_I_E_NAME(bh,ih,entry_num) ((char *)(bh->b_data + ih_location(ih) + deh_location(B_I_DEH(bh,ih)+(entry_num))))
1185
1186// two entries per block (at least)
1187#define REISERFS_MAX_NAME(block_size) 255
1188
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189/* this structure is used for operations on directory entries. It is
1190 not a disk structure. */
1191/* When reiserfs_find_entry or search_by_entry_key find directory
1192 entry, they return filled reiserfs_dir_entry structure */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001193struct reiserfs_dir_entry {
1194 struct buffer_head *de_bh;
1195 int de_item_num;
1196 struct item_head *de_ih;
1197 int de_entry_num;
1198 struct reiserfs_de_head *de_deh;
1199 int de_entrylen;
1200 int de_namelen;
1201 char *de_name;
Jeff Mahoney3af1efe2006-03-02 13:25:26 -05001202 unsigned long *de_gen_number_bit_string;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001204 __u32 de_dir_id;
1205 __u32 de_objectid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001207 struct cpu_key de_entry_key;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208};
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001209
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210/* these defines are useful when a particular member of a reiserfs_dir_entry is needed */
1211
1212/* pointer to file name, stored in entry */
1213#define B_I_DEH_ENTRY_FILE_NAME(bh,ih,deh) (B_I_PITEM (bh, ih) + deh_location(deh))
1214
1215/* length of name */
1216#define I_DEH_N_ENTRY_FILE_NAME_LENGTH(ih,deh,entry_num) \
1217(I_DEH_N_ENTRY_LENGTH (ih, deh, entry_num) - (de_with_sd (deh) ? SD_SIZE : 0))
1218
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219/* hash value occupies bits from 7 up to 30 */
1220#define GET_HASH_VALUE(offset) ((offset) & 0x7fffff80LL)
1221/* generation number occupies 7 bits starting from 0 up to 6 */
1222#define GET_GENERATION_NUMBER(offset) ((offset) & 0x7fLL)
1223#define MAX_GENERATION_NUMBER 127
1224
1225#define SET_GENERATION_NUMBER(offset,gen_number) (GET_HASH_VALUE(offset)|(gen_number))
1226
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227/*
1228 * Picture represents an internal node of the reiserfs tree
1229 * ______________________________________________________
1230 * | | Array of | Array of | Free |
1231 * |block | keys | pointers | space |
1232 * | head | N | N+1 | |
1233 * |______|_______________|___________________|___________|
1234 */
1235
1236/***************************************************************************/
1237/* DISK CHILD */
1238/***************************************************************************/
1239/* Disk child pointer: The pointer from an internal node of the tree
1240 to a node that is on disk. */
1241struct disk_child {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001242 __le32 dc_block_number; /* Disk child's block number. */
1243 __le16 dc_size; /* Disk child's used space. */
1244 __le16 dc_reserved;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245};
1246
1247#define DC_SIZE (sizeof(struct disk_child))
1248#define dc_block_number(dc_p) (le32_to_cpu((dc_p)->dc_block_number))
1249#define dc_size(dc_p) (le16_to_cpu((dc_p)->dc_size))
1250#define put_dc_block_number(dc_p, val) do { (dc_p)->dc_block_number = cpu_to_le32(val); } while(0)
1251#define put_dc_size(dc_p, val) do { (dc_p)->dc_size = cpu_to_le16(val); } while(0)
1252
1253/* Get disk child by buffer header and position in the tree node. */
Jeff Mahoneyad31a4f2009-03-30 14:02:46 -04001254#define B_N_CHILD(bh, n_pos) ((struct disk_child *)\
1255((bh)->b_data + BLKH_SIZE + B_NR_ITEMS(bh) * KEY_SIZE + DC_SIZE * (n_pos)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256
1257/* Get disk child number by buffer header and position in the tree node. */
Jeff Mahoneyad31a4f2009-03-30 14:02:46 -04001258#define B_N_CHILD_NUM(bh, n_pos) (dc_block_number(B_N_CHILD(bh, n_pos)))
1259#define PUT_B_N_CHILD_NUM(bh, n_pos, val) \
1260 (put_dc_block_number(B_N_CHILD(bh, n_pos), val))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001262 /* maximal value of field child_size in structure disk_child */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263 /* child size is the combined size of all items and their headers */
1264#define MAX_CHILD_SIZE(bh) ((int)( (bh)->b_size - BLKH_SIZE ))
1265
1266/* amount of used space in buffer (not including block head) */
1267#define B_CHILD_SIZE(cur) (MAX_CHILD_SIZE(cur)-(B_FREE_SPACE(cur)))
1268
1269/* max and min number of keys in internal node */
1270#define MAX_NR_KEY(bh) ( (MAX_CHILD_SIZE(bh)-DC_SIZE)/(KEY_SIZE+DC_SIZE) )
1271#define MIN_NR_KEY(bh) (MAX_NR_KEY(bh)/2)
1272
1273/***************************************************************************/
1274/* PATH STRUCTURES AND DEFINES */
1275/***************************************************************************/
1276
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277/* Search_by_key fills up the path from the root to the leaf as it descends the tree looking for the
1278 key. It uses reiserfs_bread to try to find buffers in the cache given their block number. If it
1279 does not find them in the cache it reads them from disk. For each node search_by_key finds using
1280 reiserfs_bread it then uses bin_search to look through that node. bin_search will find the
1281 position of the block_number of the next node if it is looking through an internal node. If it
1282 is looking through a leaf node bin_search will find the position of the item which has key either
1283 equal to given key, or which is the maximal key less than the given key. */
1284
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001285struct path_element {
1286 struct buffer_head *pe_buffer; /* Pointer to the buffer at the path in the tree. */
1287 int pe_position; /* Position in the tree node which is placed in the */
1288 /* buffer above. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289};
1290
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001291#define MAX_HEIGHT 5 /* maximal height of a tree. don't change this without changing JOURNAL_PER_BALANCE_CNT */
1292#define EXTENDED_MAX_HEIGHT 7 /* Must be equals MAX_HEIGHT + FIRST_PATH_ELEMENT_OFFSET */
1293#define FIRST_PATH_ELEMENT_OFFSET 2 /* Must be equal to at least 2. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001295#define ILLEGAL_PATH_ELEMENT_OFFSET 1 /* Must be equal to FIRST_PATH_ELEMENT_OFFSET - 1 */
1296#define MAX_FEB_SIZE 6 /* this MUST be MAX_HEIGHT + 1. See about FEB below */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297
1298/* We need to keep track of who the ancestors of nodes are. When we
1299 perform a search we record which nodes were visited while
1300 descending the tree looking for the node we searched for. This list
1301 of nodes is called the path. This information is used while
1302 performing balancing. Note that this path information may become
1303 invalid, and this means we must check it when using it to see if it
1304 is still valid. You'll need to read search_by_key and the comments
1305 in it, especially about decrement_counters_in_path(), to understand
1306 this structure.
1307
1308Paths make the code so much harder to work with and debug.... An
1309enormous number of bugs are due to them, and trying to write or modify
1310code that uses them just makes my head hurt. They are based on an
1311excessive effort to avoid disturbing the precious VFS code.:-( The
1312gods only know how we are going to SMP the code that uses them.
1313znodes are the way! */
1314
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001315#define PATH_READA 0x1 /* do read ahead */
1316#define PATH_READA_BACK 0x2 /* read backwards */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001318struct treepath {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001319 int path_length; /* Length of the array above. */
1320 int reada;
1321 struct path_element path_elements[EXTENDED_MAX_HEIGHT]; /* Array of the path elements. */
1322 int pos_in_item;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323};
1324
1325#define pos_in_item(path) ((path)->pos_in_item)
1326
1327#define INITIALIZE_PATH(var) \
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001328struct treepath var = {.path_length = ILLEGAL_PATH_ELEMENT_OFFSET, .reada = 0,}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329
1330/* Get path element by path and path position. */
Jeff Mahoneyd68caa92009-03-30 14:02:49 -04001331#define PATH_OFFSET_PELEMENT(path, n_offset) ((path)->path_elements + (n_offset))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332
1333/* Get buffer header at the path by path and path position. */
Jeff Mahoneyd68caa92009-03-30 14:02:49 -04001334#define PATH_OFFSET_PBUFFER(path, n_offset) (PATH_OFFSET_PELEMENT(path, n_offset)->pe_buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335
1336/* Get position in the element at the path by path and path position. */
Jeff Mahoneyd68caa92009-03-30 14:02:49 -04001337#define PATH_OFFSET_POSITION(path, n_offset) (PATH_OFFSET_PELEMENT(path, n_offset)->pe_position)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338
Jeff Mahoneyd68caa92009-03-30 14:02:49 -04001339#define PATH_PLAST_BUFFER(path) (PATH_OFFSET_PBUFFER((path), (path)->path_length))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 /* you know, to the person who didn't
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001341 write this the macro name does not
1342 at first suggest what it does.
1343 Maybe POSITION_FROM_PATH_END? Or
1344 maybe we should just focus on
1345 dumping paths... -Hans */
Jeff Mahoneyd68caa92009-03-30 14:02:49 -04001346#define PATH_LAST_POSITION(path) (PATH_OFFSET_POSITION((path), (path)->path_length))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347
Jeff Mahoneyd68caa92009-03-30 14:02:49 -04001348#define PATH_PITEM_HEAD(path) B_N_PITEM_HEAD(PATH_PLAST_BUFFER(path), PATH_LAST_POSITION(path))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349
1350/* in do_balance leaf has h == 0 in contrast with path structure,
1351 where root has level == 0. That is why we need these defines */
Jeff Mahoneyd68caa92009-03-30 14:02:49 -04001352#define PATH_H_PBUFFER(path, h) PATH_OFFSET_PBUFFER (path, path->path_length - (h)) /* tb->S[h] */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001353#define PATH_H_PPARENT(path, h) PATH_H_PBUFFER (path, (h) + 1) /* tb->F[h] or tb->S[0]->b_parent */
1354#define PATH_H_POSITION(path, h) PATH_OFFSET_POSITION (path, path->path_length - (h))
1355#define PATH_H_B_ITEM_ORDER(path, h) PATH_H_POSITION(path, h + 1) /* tb->S[h]->b_item_order */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356
Jeff Mahoneyd68caa92009-03-30 14:02:49 -04001357#define PATH_H_PATH_OFFSET(path, n_h) ((path)->path_length - (n_h))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358
1359#define get_last_bh(path) PATH_PLAST_BUFFER(path)
1360#define get_ih(path) PATH_PITEM_HEAD(path)
1361#define get_item_pos(path) PATH_LAST_POSITION(path)
1362#define get_item(path) ((void *)B_N_PITEM(PATH_PLAST_BUFFER(path), PATH_LAST_POSITION (path)))
1363#define item_moved(ih,path) comp_items(ih, path)
1364#define path_changed(ih,path) comp_items (ih, path)
1365
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366/***************************************************************************/
1367/* MISC */
1368/***************************************************************************/
1369
1370/* Size of pointer to the unformatted node. */
1371#define UNFM_P_SIZE (sizeof(unp_t))
1372#define UNFM_P_SHIFT 2
1373
1374// in in-core inode key is stored on le form
1375#define INODE_PKEY(inode) ((struct reiserfs_key *)(REISERFS_I(inode)->i_key))
1376
1377#define MAX_UL_INT 0xffffffff
1378#define MAX_INT 0x7ffffff
1379#define MAX_US_INT 0xffff
1380
1381// reiserfs version 2 has max offset 60 bits. Version 1 - 32 bit offset
1382#define U32_MAX (~(__u32)0)
1383
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001384static inline loff_t max_reiserfs_offset(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001386 if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5)
1387 return (loff_t) U32_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001389 return (loff_t) ((~(__u64) 0) >> 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390}
1391
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392/*#define MAX_KEY_UNIQUENESS MAX_UL_INT*/
1393#define MAX_KEY_OBJECTID MAX_UL_INT
1394
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395#define MAX_B_NUM MAX_UL_INT
1396#define MAX_FC_NUM MAX_US_INT
1397
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398/* the purpose is to detect overflow of an unsigned short */
1399#define REISERFS_LINK_MAX (MAX_US_INT - 1000)
1400
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401/* The following defines are used in reiserfs_insert_item and reiserfs_append_item */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001402#define REISERFS_KERNEL_MEM 0 /* reiserfs kernel memory mode */
1403#define REISERFS_USER_MEM 1 /* reiserfs user memory mode */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404
1405#define fs_generation(s) (REISERFS_SB(s)->s_generation_counter)
1406#define get_generation(s) atomic_read (&fs_generation(s))
1407#define FILESYSTEM_CHANGED_TB(tb) (get_generation((tb)->tb_sb) != (tb)->fs_gen)
1408#define __fs_changed(gen,s) (gen != get_generation (s))
Frederic Weisbeckerf32049d2009-04-30 22:05:25 +02001409#define fs_changed(gen,s) \
1410({ \
Frederic Weisbeckerd663af82009-05-07 23:25:29 +02001411 reiserfs_cond_resched(s); \
Frederic Weisbeckerf32049d2009-04-30 22:05:25 +02001412 __fs_changed(gen, s); \
1413})
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415/***************************************************************************/
1416/* FIXATE NODES */
1417/***************************************************************************/
1418
1419#define VI_TYPE_LEFT_MERGEABLE 1
1420#define VI_TYPE_RIGHT_MERGEABLE 2
1421
1422/* To make any changes in the tree we always first find node, that
1423 contains item to be changed/deleted or place to insert a new
1424 item. We call this node S. To do balancing we need to decide what
1425 we will shift to left/right neighbor, or to a new node, where new
1426 item will be etc. To make this analysis simpler we build virtual
1427 node. Virtual node is an array of items, that will replace items of
1428 node S. (For instance if we are going to delete an item, virtual
1429 node does not contain it). Virtual node keeps information about
1430 item sizes and types, mergeability of first and last items, sizes
1431 of all entries in directory item. We use this array of items when
1432 calculating what we can shift to neighbors and how many nodes we
1433 have to have if we do not any shiftings, if we shift to left/right
1434 neighbor or to both. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001435struct virtual_item {
1436 int vi_index; // index in the array of item operations
1437 unsigned short vi_type; // left/right mergeability
1438 unsigned short vi_item_len; /* length of item that it will have after balancing */
1439 struct item_head *vi_ih;
1440 const char *vi_item; // body of item (old or new)
1441 const void *vi_new_data; // 0 always but paste mode
1442 void *vi_uarea; // item specific area
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443};
1444
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001445struct virtual_node {
1446 char *vn_free_ptr; /* this is a pointer to the free space in the buffer */
1447 unsigned short vn_nr_item; /* number of items in virtual node */
1448 short vn_size; /* size of node , that node would have if it has unlimited size and no balancing is performed */
1449 short vn_mode; /* mode of balancing (paste, insert, delete, cut) */
1450 short vn_affected_item_num;
1451 short vn_pos_in_item;
1452 struct item_head *vn_ins_ih; /* item header of inserted item, 0 for other modes */
1453 const void *vn_data;
1454 struct virtual_item *vn_vi; /* array of items (including a new one, excluding item to be deleted) */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455};
1456
1457/* used by directory items when creating virtual nodes */
1458struct direntry_uarea {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001459 int flags;
1460 __u16 entry_count;
1461 __u16 entry_sizes[1];
1462} __attribute__ ((__packed__));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463
1464/***************************************************************************/
1465/* TREE BALANCE */
1466/***************************************************************************/
1467
1468/* This temporary structure is used in tree balance algorithms, and
1469 constructed as we go to the extent that its various parts are
1470 needed. It contains arrays of nodes that can potentially be
1471 involved in the balancing of node S, and parameters that define how
1472 each of the nodes must be balanced. Note that in these algorithms
1473 for balancing the worst case is to need to balance the current node
1474 S and the left and right neighbors and all of their parents plus
1475 create a new node. We implement S1 balancing for the leaf nodes
1476 and S0 balancing for the internal nodes (S1 and S0 are defined in
1477 our papers.)*/
1478
1479#define MAX_FREE_BLOCK 7 /* size of the array of buffers to free at end of do_balance */
1480
1481/* maximum number of FEB blocknrs on a single level */
1482#define MAX_AMOUNT_NEEDED 2
1483
1484/* someday somebody will prefix every field in this struct with tb_ */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001485struct tree_balance {
1486 int tb_mode;
1487 int need_balance_dirty;
1488 struct super_block *tb_sb;
1489 struct reiserfs_transaction_handle *transaction_handle;
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001490 struct treepath *tb_path;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001491 struct buffer_head *L[MAX_HEIGHT]; /* array of left neighbors of nodes in the path */
1492 struct buffer_head *R[MAX_HEIGHT]; /* array of right neighbors of nodes in the path */
1493 struct buffer_head *FL[MAX_HEIGHT]; /* array of fathers of the left neighbors */
1494 struct buffer_head *FR[MAX_HEIGHT]; /* array of fathers of the right neighbors */
1495 struct buffer_head *CFL[MAX_HEIGHT]; /* array of common parents of center node and its left neighbor */
1496 struct buffer_head *CFR[MAX_HEIGHT]; /* array of common parents of center node and its right neighbor */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001498 struct buffer_head *FEB[MAX_FEB_SIZE]; /* array of empty buffers. Number of buffers in array equals
1499 cur_blknum. */
1500 struct buffer_head *used[MAX_FEB_SIZE];
1501 struct buffer_head *thrown[MAX_FEB_SIZE];
1502 int lnum[MAX_HEIGHT]; /* array of number of items which must be
1503 shifted to the left in order to balance the
1504 current node; for leaves includes item that
1505 will be partially shifted; for internal
1506 nodes, it is the number of child pointers
1507 rather than items. It includes the new item
1508 being created. The code sometimes subtracts
1509 one to get the number of wholly shifted
1510 items for other purposes. */
1511 int rnum[MAX_HEIGHT]; /* substitute right for left in comment above */
1512 int lkey[MAX_HEIGHT]; /* array indexed by height h mapping the key delimiting L[h] and
1513 S[h] to its item number within the node CFL[h] */
1514 int rkey[MAX_HEIGHT]; /* substitute r for l in comment above */
1515 int insert_size[MAX_HEIGHT]; /* the number of bytes by we are trying to add or remove from
1516 S[h]. A negative value means removing. */
1517 int blknum[MAX_HEIGHT]; /* number of nodes that will replace node S[h] after
1518 balancing on the level h of the tree. If 0 then S is
1519 being deleted, if 1 then S is remaining and no new nodes
1520 are being created, if 2 or 3 then 1 or 2 new nodes is
1521 being created */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001523 /* fields that are used only for balancing leaves of the tree */
1524 int cur_blknum; /* number of empty blocks having been already allocated */
1525 int s0num; /* number of items that fall into left most node when S[0] splits */
1526 int s1num; /* number of items that fall into first new node when S[0] splits */
1527 int s2num; /* number of items that fall into second new node when S[0] splits */
1528 int lbytes; /* number of bytes which can flow to the left neighbor from the left */
1529 /* most liquid item that cannot be shifted from S[0] entirely */
1530 /* if -1 then nothing will be partially shifted */
1531 int rbytes; /* number of bytes which will flow to the right neighbor from the right */
1532 /* most liquid item that cannot be shifted from S[0] entirely */
1533 /* if -1 then nothing will be partially shifted */
1534 int s1bytes; /* number of bytes which flow to the first new node when S[0] splits */
1535 /* note: if S[0] splits into 3 nodes, then items do not need to be cut */
1536 int s2bytes;
1537 struct buffer_head *buf_to_free[MAX_FREE_BLOCK]; /* buffers which are to be freed after do_balance finishes by unfix_nodes */
1538 char *vn_buf; /* kmalloced memory. Used to create
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539 virtual node and keep map of
1540 dirtied bitmap blocks */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001541 int vn_buf_size; /* size of the vn_buf */
1542 struct virtual_node *tb_vn; /* VN starts after bitmap of bitmap blocks */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001544 int fs_gen; /* saved value of `reiserfs_generation' counter
1545 see FILESYSTEM_CHANGED() macro in reiserfs_fs.h */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546#ifdef DISPLACE_NEW_PACKING_LOCALITIES
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001547 struct in_core_key key; /* key pointer, to pass to block allocator or
1548 another low-level subsystem */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001550};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551
1552/* These are modes of balancing */
1553
1554/* When inserting an item. */
1555#define M_INSERT 'i'
1556/* When inserting into (directories only) or appending onto an already
1557 existant item. */
1558#define M_PASTE 'p'
1559/* When deleting an item. */
1560#define M_DELETE 'd'
1561/* When truncating an item or removing an entry from a (directory) item. */
1562#define M_CUT 'c'
1563
1564/* used when balancing on leaf level skipped (in reiserfsck) */
1565#define M_INTERNAL 'n'
1566
1567/* When further balancing is not needed, then do_balance does not need
1568 to be called. */
1569#define M_SKIP_BALANCING 's'
1570#define M_CONVERT 'v'
1571
1572/* modes of leaf_move_items */
1573#define LEAF_FROM_S_TO_L 0
1574#define LEAF_FROM_S_TO_R 1
1575#define LEAF_FROM_R_TO_L 2
1576#define LEAF_FROM_L_TO_R 3
1577#define LEAF_FROM_S_TO_SNEW 4
1578
1579#define FIRST_TO_LAST 0
1580#define LAST_TO_FIRST 1
1581
1582/* used in do_balance for passing parent of node information that has
1583 been gotten from tb struct */
1584struct buffer_info {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001585 struct tree_balance *tb;
1586 struct buffer_head *bi_bh;
1587 struct buffer_head *bi_parent;
1588 int bi_position;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589};
1590
Jeff Mahoneyc3a9c212009-03-30 14:02:25 -04001591static inline struct super_block *sb_from_tb(struct tree_balance *tb)
1592{
1593 return tb ? tb->tb_sb : NULL;
1594}
1595
1596static inline struct super_block *sb_from_bi(struct buffer_info *bi)
1597{
1598 return bi ? sb_from_tb(bi->tb) : NULL;
1599}
1600
Linus Torvalds1da177e2005-04-16 15:20:36 -07001601/* there are 4 types of items: stat data, directory item, indirect, direct.
1602+-------------------+------------+--------------+------------+
1603| | k_offset | k_uniqueness | mergeable? |
1604+-------------------+------------+--------------+------------+
1605| stat data | 0 | 0 | no |
1606+-------------------+------------+--------------+------------+
1607| 1st directory item| DOT_OFFSET |DIRENTRY_UNIQUENESS| no |
1608| non 1st directory | hash value | | yes |
1609| item | | | |
1610+-------------------+------------+--------------+------------+
1611| indirect item | offset + 1 |TYPE_INDIRECT | if this is not the first indirect item of the object
1612+-------------------+------------+--------------+------------+
1613| direct item | offset + 1 |TYPE_DIRECT | if not this is not the first direct item of the object
1614+-------------------+------------+--------------+------------+
1615*/
1616
1617struct item_operations {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001618 int (*bytes_number) (struct item_head * ih, int block_size);
1619 void (*decrement_key) (struct cpu_key *);
1620 int (*is_left_mergeable) (struct reiserfs_key * ih,
1621 unsigned long bsize);
1622 void (*print_item) (struct item_head *, char *item);
1623 void (*check_item) (struct item_head *, char *item);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001625 int (*create_vi) (struct virtual_node * vn, struct virtual_item * vi,
1626 int is_affected, int insert_size);
1627 int (*check_left) (struct virtual_item * vi, int free,
1628 int start_skip, int end_skip);
1629 int (*check_right) (struct virtual_item * vi, int free);
1630 int (*part_size) (struct virtual_item * vi, int from, int to);
1631 int (*unit_num) (struct virtual_item * vi);
1632 void (*print_vi) (struct virtual_item * vi);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633};
1634
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001635extern struct item_operations *item_ops[TYPE_ANY + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636
1637#define op_bytes_number(ih,bsize) item_ops[le_ih_k_type (ih)]->bytes_number (ih, bsize)
1638#define op_is_left_mergeable(key,bsize) item_ops[le_key_k_type (le_key_version (key), key)]->is_left_mergeable (key, bsize)
1639#define op_print_item(ih,item) item_ops[le_ih_k_type (ih)]->print_item (ih, item)
1640#define op_check_item(ih,item) item_ops[le_ih_k_type (ih)]->check_item (ih, item)
1641#define op_create_vi(vn,vi,is_affected,insert_size) item_ops[le_ih_k_type ((vi)->vi_ih)]->create_vi (vn,vi,is_affected,insert_size)
1642#define op_check_left(vi,free,start_skip,end_skip) item_ops[(vi)->vi_index]->check_left (vi, free, start_skip, end_skip)
1643#define op_check_right(vi,free) item_ops[(vi)->vi_index]->check_right (vi, free)
1644#define op_part_size(vi,from,to) item_ops[(vi)->vi_index]->part_size (vi, from, to)
1645#define op_unit_num(vi) item_ops[(vi)->vi_index]->unit_num (vi)
1646#define op_print_vi(vi) item_ops[(vi)->vi_index]->print_vi (vi)
1647
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648#define COMP_SHORT_KEYS comp_short_keys
1649
1650/* number of blocks pointed to by the indirect item */
Jeff Mahoneyd68caa92009-03-30 14:02:49 -04001651#define I_UNFM_NUM(ih) (ih_item_len(ih) / UNFM_P_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652
1653/* the used space within the unformatted node corresponding to pos within the item pointed to by ih */
1654#define I_POS_UNFM_SIZE(ih,pos,size) (((pos) == I_UNFM_NUM(ih) - 1 ) ? (size) - ih_free_space(ih) : (size))
1655
1656/* number of bytes contained by the direct item or the unformatted nodes the indirect item points to */
1657
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001658/* get the item header */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659#define B_N_PITEM_HEAD(bh,item_num) ( (struct item_head * )((bh)->b_data + BLKH_SIZE) + (item_num) )
1660
1661/* get key */
1662#define B_N_PDELIM_KEY(bh,item_num) ( (struct reiserfs_key * )((bh)->b_data + BLKH_SIZE) + (item_num) )
1663
1664/* get the key */
1665#define B_N_PKEY(bh,item_num) ( &(B_N_PITEM_HEAD(bh,item_num)->ih_key) )
1666
1667/* get item body */
1668#define B_N_PITEM(bh,item_num) ( (bh)->b_data + ih_location(B_N_PITEM_HEAD((bh),(item_num))))
1669
1670/* get the stat data by the buffer header and the item order */
1671#define B_N_STAT_DATA(bh,nr) \
1672( (struct stat_data *)((bh)->b_data + ih_location(B_N_PITEM_HEAD((bh),(nr))) ) )
1673
1674 /* following defines use reiserfs buffer header and item header */
1675
1676/* get stat-data */
1677#define B_I_STAT_DATA(bh, ih) ( (struct stat_data * )((bh)->b_data + ih_location(ih)) )
1678
1679// this is 3976 for size==4096
1680#define MAX_DIRECT_ITEM_LEN(size) ((size) - BLKH_SIZE - 2*IH_SIZE - SD_SIZE - UNFM_P_SIZE)
1681
1682/* indirect items consist of entries which contain blocknrs, pos
1683 indicates which entry, and B_I_POS_UNFM_POINTER resolves to the
1684 blocknr contained by the entry pos points to */
1685#define B_I_POS_UNFM_POINTER(bh,ih,pos) le32_to_cpu(*(((unp_t *)B_I_PITEM(bh,ih)) + (pos)))
1686#define PUT_B_I_POS_UNFM_POINTER(bh,ih,pos, val) do {*(((unp_t *)B_I_PITEM(bh,ih)) + (pos)) = cpu_to_le32(val); } while (0)
1687
1688struct reiserfs_iget_args {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001689 __u32 objectid;
1690 __u32 dirid;
1691};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001692
1693/***************************************************************************/
1694/* FUNCTION DECLARATIONS */
1695/***************************************************************************/
1696
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697#define get_journal_desc_magic(bh) (bh->b_data + bh->b_size - 12)
1698
1699#define journal_trans_half(blocksize) \
1700 ((blocksize - sizeof (struct reiserfs_journal_desc) + sizeof (__u32) - 12) / sizeof (__u32))
1701
1702/* journal.c see journal.c for all the comments here */
1703
1704/* first block written in a commit. */
1705struct reiserfs_journal_desc {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001706 __le32 j_trans_id; /* id of commit */
1707 __le32 j_len; /* length of commit. len +1 is the commit block */
1708 __le32 j_mount_id; /* mount id of this trans */
1709 __le32 j_realblock[1]; /* real locations for each block */
1710};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001711
1712#define get_desc_trans_id(d) le32_to_cpu((d)->j_trans_id)
1713#define get_desc_trans_len(d) le32_to_cpu((d)->j_len)
1714#define get_desc_mount_id(d) le32_to_cpu((d)->j_mount_id)
1715
1716#define set_desc_trans_id(d,val) do { (d)->j_trans_id = cpu_to_le32 (val); } while (0)
1717#define set_desc_trans_len(d,val) do { (d)->j_len = cpu_to_le32 (val); } while (0)
1718#define set_desc_mount_id(d,val) do { (d)->j_mount_id = cpu_to_le32 (val); } while (0)
1719
1720/* last block written in a commit */
1721struct reiserfs_journal_commit {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001722 __le32 j_trans_id; /* must match j_trans_id from the desc block */
1723 __le32 j_len; /* ditto */
1724 __le32 j_realblock[1]; /* real locations for each block */
1725};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726
1727#define get_commit_trans_id(c) le32_to_cpu((c)->j_trans_id)
1728#define get_commit_trans_len(c) le32_to_cpu((c)->j_len)
1729#define get_commit_mount_id(c) le32_to_cpu((c)->j_mount_id)
1730
1731#define set_commit_trans_id(c,val) do { (c)->j_trans_id = cpu_to_le32 (val); } while (0)
1732#define set_commit_trans_len(c,val) do { (c)->j_len = cpu_to_le32 (val); } while (0)
1733
1734/* this header block gets written whenever a transaction is considered fully flushed, and is more recent than the
1735** last fully flushed transaction. fully flushed means all the log blocks and all the real blocks are on disk,
1736** and this transaction does not need to be replayed.
1737*/
1738struct reiserfs_journal_header {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001739 __le32 j_last_flush_trans_id; /* id of last fully flushed transaction */
1740 __le32 j_first_unflushed_offset; /* offset in the log of where to start replay after a crash */
1741 __le32 j_mount_id;
1742 /* 12 */ struct journal_params jh_journal;
1743};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744
1745/* biggest tunable defines are right here */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001746#define JOURNAL_BLOCK_COUNT 8192 /* number of blocks in the journal */
1747#define JOURNAL_TRANS_MAX_DEFAULT 1024 /* biggest possible single transaction, don't change for now (8/3/99) */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748#define JOURNAL_TRANS_MIN_DEFAULT 256
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001749#define JOURNAL_MAX_BATCH_DEFAULT 900 /* max blocks to batch into one transaction, don't make this any bigger than 900 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750#define JOURNAL_MIN_RATIO 2
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001751#define JOURNAL_MAX_COMMIT_AGE 30
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752#define JOURNAL_MAX_TRANS_AGE 30
1753#define JOURNAL_PER_BALANCE_CNT (3 * (MAX_HEIGHT-2) + 9)
Jeff Mahoney0ab26212009-03-30 14:02:39 -04001754#define JOURNAL_BLOCKS_PER_OBJECT(sb) (JOURNAL_PER_BALANCE_CNT * 3 + \
1755 2 * (REISERFS_QUOTA_INIT_BLOCKS(sb) + \
1756 REISERFS_QUOTA_TRANS_BLOCKS(sb)))
1757
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758#ifdef CONFIG_QUOTA
Jan Kara556a2a42005-06-23 22:01:06 -07001759/* We need to update data and inode (atime) */
1760#define REISERFS_QUOTA_TRANS_BLOCKS(s) (REISERFS_SB(s)->s_mount_opt & (1<<REISERFS_QUOTA) ? 2 : 0)
1761/* 1 balancing, 1 bitmap, 1 data per write + stat data update */
1762#define REISERFS_QUOTA_INIT_BLOCKS(s) (REISERFS_SB(s)->s_mount_opt & (1<<REISERFS_QUOTA) ? \
1763(DQUOT_INIT_ALLOC*(JOURNAL_PER_BALANCE_CNT+2)+DQUOT_INIT_REWRITE+1) : 0)
1764/* same as with INIT */
1765#define REISERFS_QUOTA_DEL_BLOCKS(s) (REISERFS_SB(s)->s_mount_opt & (1<<REISERFS_QUOTA) ? \
1766(DQUOT_DEL_ALLOC*(JOURNAL_PER_BALANCE_CNT+2)+DQUOT_DEL_REWRITE+1) : 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001767#else
Jan Kara556a2a42005-06-23 22:01:06 -07001768#define REISERFS_QUOTA_TRANS_BLOCKS(s) 0
1769#define REISERFS_QUOTA_INIT_BLOCKS(s) 0
1770#define REISERFS_QUOTA_DEL_BLOCKS(s) 0
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771#endif
1772
1773/* both of these can be as low as 1, or as high as you want. The min is the
1774** number of 4k bitmap nodes preallocated on mount. New nodes are allocated
1775** as needed, and released when transactions are committed. On release, if
1776** the current number of nodes is > max, the node is freed, otherwise,
1777** it is put on a free list for faster use later.
1778*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001779#define REISERFS_MIN_BITMAP_NODES 10
1780#define REISERFS_MAX_BITMAP_NODES 100
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001782#define JBH_HASH_SHIFT 13 /* these are based on journal hash size of 8192 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783#define JBH_HASH_MASK 8191
1784
1785#define _jhashfn(sb,block) \
1786 (((unsigned long)sb>>L1_CACHE_SHIFT) ^ \
1787 (((block)<<(JBH_HASH_SHIFT - 6)) ^ ((block) >> 13) ^ ((block) << (JBH_HASH_SHIFT - 12))))
1788#define journal_hash(t,sb,block) ((t)[_jhashfn((sb),(block)) & JBH_HASH_MASK])
1789
1790// We need these to make journal.c code more readable
1791#define journal_find_get_block(s, block) __find_get_block(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize)
1792#define journal_getblk(s, block) __getblk(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize)
1793#define journal_bread(s, block) __bread(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize)
1794
1795enum reiserfs_bh_state_bits {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001796 BH_JDirty = BH_PrivateStart, /* buffer is in current transaction */
1797 BH_JDirty_wait,
1798 BH_JNew, /* disk block was taken off free list before
1799 * being in a finished transaction, or
1800 * written to disk. Can be reused immed. */
1801 BH_JPrepared,
1802 BH_JRestore_dirty,
1803 BH_JTest, // debugging only will go away
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804};
1805
1806BUFFER_FNS(JDirty, journaled);
1807TAS_BUFFER_FNS(JDirty, journaled);
1808BUFFER_FNS(JDirty_wait, journal_dirty);
1809TAS_BUFFER_FNS(JDirty_wait, journal_dirty);
1810BUFFER_FNS(JNew, journal_new);
1811TAS_BUFFER_FNS(JNew, journal_new);
1812BUFFER_FNS(JPrepared, journal_prepared);
1813TAS_BUFFER_FNS(JPrepared, journal_prepared);
1814BUFFER_FNS(JRestore_dirty, journal_restore_dirty);
1815TAS_BUFFER_FNS(JRestore_dirty, journal_restore_dirty);
1816BUFFER_FNS(JTest, journal_test);
1817TAS_BUFFER_FNS(JTest, journal_test);
1818
1819/*
1820** transaction handle which is passed around for all journal calls
1821*/
1822struct reiserfs_transaction_handle {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001823 struct super_block *t_super; /* super for this FS when journal_begin was
1824 called. saves calls to reiserfs_get_super
1825 also used by nested transactions to make
1826 sure they are nesting on the right FS
1827 _must_ be first in the handle
1828 */
1829 int t_refcount;
1830 int t_blocks_logged; /* number of blocks this writer has logged */
1831 int t_blocks_allocated; /* number of blocks this writer allocated */
Jeff Mahoney600ed412009-03-30 14:02:17 -04001832 unsigned int t_trans_id; /* sanity check, equals the current trans id */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001833 void *t_handle_save; /* save existing current->journal_info */
1834 unsigned displace_new_blocks:1; /* if new block allocation occurres, that block
1835 should be displaced from others */
1836 struct list_head t_list;
1837};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838
1839/* used to keep track of ordered and tail writes, attached to the buffer
1840 * head through b_journal_head.
1841 */
1842struct reiserfs_jh {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001843 struct reiserfs_journal_list *jl;
1844 struct buffer_head *bh;
1845 struct list_head list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846};
1847
1848void reiserfs_free_jh(struct buffer_head *bh);
1849int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh);
1850int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001851int journal_mark_dirty(struct reiserfs_transaction_handle *,
1852 struct super_block *, struct buffer_head *bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001854static inline int reiserfs_file_data_log(struct inode *inode)
1855{
1856 if (reiserfs_data_log(inode->i_sb) ||
1857 (REISERFS_I(inode)->i_flags & i_data_log))
1858 return 1;
1859 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860}
1861
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001862static inline int reiserfs_transaction_running(struct super_block *s)
1863{
1864 struct reiserfs_transaction_handle *th = current->journal_info;
1865 if (th && th->t_super == s)
1866 return 1;
1867 if (th && th->t_super == NULL)
1868 BUG();
1869 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001870}
1871
Alexander Zarochentzev23f9e0f2006-03-25 03:06:57 -08001872static inline int reiserfs_transaction_free_space(struct reiserfs_transaction_handle *th)
1873{
1874 return th->t_blocks_allocated - th->t_blocks_logged;
1875}
1876
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001877struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
1878 super_block
1879 *,
1880 int count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *);
1882int reiserfs_commit_page(struct inode *inode, struct page *page,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001883 unsigned from, unsigned to);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884int reiserfs_flush_old_commits(struct super_block *);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001885int reiserfs_commit_for_inode(struct inode *);
1886int reiserfs_inode_needs_commit(struct inode *);
1887void reiserfs_update_inode_transaction(struct inode *);
1888void reiserfs_wait_on_write_block(struct super_block *s);
1889void reiserfs_block_writes(struct reiserfs_transaction_handle *th);
1890void reiserfs_allow_writes(struct super_block *s);
1891void reiserfs_check_lock_depth(struct super_block *s, char *caller);
1892int reiserfs_prepare_for_journal(struct super_block *, struct buffer_head *bh,
1893 int wait);
1894void reiserfs_restore_prepared_buffer(struct super_block *,
1895 struct buffer_head *bh);
1896int journal_init(struct super_block *, const char *j_dev_name, int old_format,
1897 unsigned int);
1898int journal_release(struct reiserfs_transaction_handle *, struct super_block *);
1899int journal_release_error(struct reiserfs_transaction_handle *,
1900 struct super_block *);
1901int journal_end(struct reiserfs_transaction_handle *, struct super_block *,
1902 unsigned long);
1903int journal_end_sync(struct reiserfs_transaction_handle *, struct super_block *,
1904 unsigned long);
1905int journal_mark_freed(struct reiserfs_transaction_handle *,
1906 struct super_block *, b_blocknr_t blocknr);
1907int journal_transaction_should_end(struct reiserfs_transaction_handle *, int);
Jeff Mahoneya9dd3642009-03-30 14:02:45 -04001908int reiserfs_in_journal(struct super_block *sb, unsigned int bmap_nr,
1909 int bit_nr, int searchall, b_blocknr_t *next);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001910int journal_begin(struct reiserfs_transaction_handle *,
Jeff Mahoneya9dd3642009-03-30 14:02:45 -04001911 struct super_block *sb, unsigned long);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001912int journal_join_abort(struct reiserfs_transaction_handle *,
Jeff Mahoneya9dd3642009-03-30 14:02:45 -04001913 struct super_block *sb, unsigned long);
Jeff Mahoney32e8b102009-03-30 14:02:26 -04001914void reiserfs_abort_journal(struct super_block *sb, int errno);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001915void reiserfs_abort(struct super_block *sb, int errno, const char *fmt, ...);
1916int reiserfs_allocate_list_bitmaps(struct super_block *s,
Jeff Mahoney3ee16672007-10-18 23:39:25 -07001917 struct reiserfs_list_bitmap *, unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001919void add_save_link(struct reiserfs_transaction_handle *th,
1920 struct inode *inode, int truncate);
1921int remove_save_link(struct inode *inode, int truncate);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922
1923/* objectid.c */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001924__u32 reiserfs_get_unused_objectid(struct reiserfs_transaction_handle *th);
1925void reiserfs_release_objectid(struct reiserfs_transaction_handle *th,
1926 __u32 objectid_to_release);
1927int reiserfs_convert_objectid_map_v1(struct super_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928
1929/* stree.c */
1930int B_IS_IN_TREE(const struct buffer_head *);
Jeff Mahoneyd68caa92009-03-30 14:02:49 -04001931extern void copy_item_head(struct item_head *to,
1932 const struct item_head *from);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933
1934// first key is in cpu form, second - le
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001935extern int comp_short_keys(const struct reiserfs_key *le_key,
1936 const struct cpu_key *cpu_key);
1937extern void le_key2cpu_key(struct cpu_key *to, const struct reiserfs_key *from);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001938
1939// both are in le form
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001940extern int comp_le_keys(const struct reiserfs_key *,
1941 const struct reiserfs_key *);
1942extern int comp_short_le_keys(const struct reiserfs_key *,
1943 const struct reiserfs_key *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944
1945//
1946// get key version from on disk key - kludge
1947//
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001948static inline int le_key_version(const struct reiserfs_key *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001950 int type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001952 type = offset_v2_k_type(&(key->u.k_offset_v2));
1953 if (type != TYPE_DIRECT && type != TYPE_INDIRECT
1954 && type != TYPE_DIRENTRY)
1955 return KEY_FORMAT_3_5;
1956
1957 return KEY_FORMAT_3_6;
1958
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959}
1960
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001961static inline void copy_key(struct reiserfs_key *to,
1962 const struct reiserfs_key *from)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001963{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001964 memcpy(to, from, KEY_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965}
1966
Jeff Mahoneyd68caa92009-03-30 14:02:49 -04001967int comp_items(const struct item_head *stored_ih, const struct treepath *path);
1968const struct reiserfs_key *get_rkey(const struct treepath *chk_path,
Jeff Mahoneya9dd3642009-03-30 14:02:45 -04001969 const struct super_block *sb);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001970int search_by_key(struct super_block *, const struct cpu_key *,
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001971 struct treepath *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972#define search_item(s,key,path) search_by_key (s, key, path, DISK_LEAF_NODE_LEVEL)
Jeff Mahoneya9dd3642009-03-30 14:02:45 -04001973int search_for_position_by_key(struct super_block *sb,
Jeff Mahoneyd68caa92009-03-30 14:02:49 -04001974 const struct cpu_key *cpu_key,
1975 struct treepath *search_path);
Jeff Mahoneyad31a4f2009-03-30 14:02:46 -04001976extern void decrement_bcount(struct buffer_head *bh);
Jeff Mahoneyd68caa92009-03-30 14:02:49 -04001977void decrement_counters_in_path(struct treepath *search_path);
1978void pathrelse(struct treepath *search_path);
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001979int reiserfs_check_path(struct treepath *p);
Jeff Mahoneyd68caa92009-03-30 14:02:49 -04001980void pathrelse_and_restore(struct super_block *s, struct treepath *search_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001981
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001982int reiserfs_insert_item(struct reiserfs_transaction_handle *th,
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001983 struct treepath *path,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001984 const struct cpu_key *key,
1985 struct item_head *ih,
1986 struct inode *inode, const char *body);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001988int reiserfs_paste_into_item(struct reiserfs_transaction_handle *th,
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001989 struct treepath *path,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001990 const struct cpu_key *key,
1991 struct inode *inode,
1992 const char *body, int paste_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001993
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001994int reiserfs_cut_from_item(struct reiserfs_transaction_handle *th,
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001995 struct treepath *path,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001996 struct cpu_key *key,
1997 struct inode *inode,
1998 struct page *page, loff_t new_file_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001999
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002000int reiserfs_delete_item(struct reiserfs_transaction_handle *th,
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08002001 struct treepath *path,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002002 const struct cpu_key *key,
Jeff Mahoneyd68caa92009-03-30 14:02:49 -04002003 struct inode *inode, struct buffer_head *un_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002004
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002005void reiserfs_delete_solid_item(struct reiserfs_transaction_handle *th,
2006 struct inode *inode, struct reiserfs_key *key);
2007int reiserfs_delete_object(struct reiserfs_transaction_handle *th,
Jeff Mahoney995c7622009-03-30 14:02:47 -04002008 struct inode *inode);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002009int reiserfs_do_truncate(struct reiserfs_transaction_handle *th,
Jeff Mahoney995c7622009-03-30 14:02:47 -04002010 struct inode *inode, struct page *,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002011 int update_timestamps);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002012
2013#define i_block_size(inode) ((inode)->i_sb->s_blocksize)
2014#define file_size(inode) ((inode)->i_size)
2015#define tail_size(inode) (file_size (inode) & (i_block_size (inode) - 1))
2016
2017#define tail_has_to_be_packed(inode) (have_large_tails ((inode)->i_sb)?\
2018!STORE_TAIL_IN_UNFM_S1(file_size (inode), tail_size(inode), inode->i_sb->s_blocksize):have_small_tails ((inode)->i_sb)?!STORE_TAIL_IN_UNFM_S2(file_size (inode), tail_size(inode), inode->i_sb->s_blocksize):0 )
2019
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002020void padd_item(char *item, int total_length, int length);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002021
2022/* inode.c */
2023/* args for the create parameter of reiserfs_get_block */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002024#define GET_BLOCK_NO_CREATE 0 /* don't create new blocks or convert tails */
2025#define GET_BLOCK_CREATE 1 /* add anything you need to find block */
2026#define GET_BLOCK_NO_HOLE 2 /* return -ENOENT for file holes */
2027#define GET_BLOCK_READ_DIRECT 4 /* read the tail if indirect item not found */
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08002028#define GET_BLOCK_NO_IMUX 8 /* i_mutex is not held, don't preallocate */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002029#define GET_BLOCK_NO_DANGLE 16 /* don't leave any transactions running */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002030
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002031void reiserfs_read_locked_inode(struct inode *inode,
2032 struct reiserfs_iget_args *args);
2033int reiserfs_find_actor(struct inode *inode, void *p);
2034int reiserfs_init_locked_inode(struct inode *inode, void *p);
Al Viro845a2cc2010-06-07 11:37:37 -04002035void reiserfs_evict_inode(struct inode *inode);
Christoph Hellwiga9185b42010-03-05 09:21:37 +01002036int reiserfs_write_inode(struct inode *inode, struct writeback_control *wbc);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002037int reiserfs_get_block(struct inode *inode, sector_t block,
2038 struct buffer_head *bh_result, int create);
Christoph Hellwigbe55caf2007-10-21 16:42:13 -07002039struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
2040 int fh_len, int fh_type);
2041struct dentry *reiserfs_fh_to_parent(struct super_block *sb, struct fid *fid,
2042 int fh_len, int fh_type);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002043int reiserfs_encode_fh(struct dentry *dentry, __u32 * data, int *lenp,
2044 int connectable);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002045
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002046int reiserfs_truncate_file(struct inode *, int update_timestamps);
2047void make_cpu_key(struct cpu_key *cpu_key, struct inode *inode, loff_t offset,
2048 int type, int key_length);
2049void make_le_item_head(struct item_head *ih, const struct cpu_key *key,
2050 int version,
2051 loff_t offset, int type, int length, int entry_count);
2052struct inode *reiserfs_iget(struct super_block *s, const struct cpu_key *key);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002053
Jeff Mahoney57fe60d2009-03-30 14:02:41 -04002054struct reiserfs_security_handle;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002055int reiserfs_new_inode(struct reiserfs_transaction_handle *th,
2056 struct inode *dir, int mode,
2057 const char *symname, loff_t i_size,
Jeff Mahoney57fe60d2009-03-30 14:02:41 -04002058 struct dentry *dentry, struct inode *inode,
2059 struct reiserfs_security_handle *security);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002060
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002061void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th,
2062 struct inode *inode, loff_t size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002063
2064static inline void reiserfs_update_sd(struct reiserfs_transaction_handle *th,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002065 struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002067 reiserfs_update_sd_size(th, inode, inode->i_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002068}
2069
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002070void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode);
2071void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002072int reiserfs_setattr(struct dentry *dentry, struct iattr *attr);
2073
Christoph Hellwigebdec242010-10-06 10:47:23 +02002074int __reiserfs_write_begin(struct page *page, unsigned from, unsigned len);
2075
Linus Torvalds1da177e2005-04-16 15:20:36 -07002076/* namei.c */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002077void set_de_name_and_namelen(struct reiserfs_dir_entry *de);
2078int search_by_entry_key(struct super_block *sb, const struct cpu_key *key,
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08002079 struct treepath *path, struct reiserfs_dir_entry *de);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002080struct dentry *reiserfs_get_parent(struct dentry *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081
Alexey Dobriyane3c96f52009-12-15 16:46:54 -08002082#ifdef CONFIG_REISERFS_PROC_INFO
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002083int reiserfs_proc_info_init(struct super_block *sb);
2084int reiserfs_proc_info_done(struct super_block *sb);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002085int reiserfs_proc_info_global_init(void);
2086int reiserfs_proc_info_global_done(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002087
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088#define PROC_EXP( e ) e
2089
2090#define __PINFO( sb ) REISERFS_SB(sb) -> s_proc_info_data
2091#define PROC_INFO_MAX( sb, field, value ) \
2092 __PINFO( sb ).field = \
2093 max( REISERFS_SB( sb ) -> s_proc_info_data.field, value )
2094#define PROC_INFO_INC( sb, field ) ( ++ ( __PINFO( sb ).field ) )
2095#define PROC_INFO_ADD( sb, field, val ) ( __PINFO( sb ).field += ( val ) )
2096#define PROC_INFO_BH_STAT( sb, bh, level ) \
2097 PROC_INFO_INC( sb, sbk_read_at[ ( level ) ] ); \
2098 PROC_INFO_ADD( sb, free_at[ ( level ) ], B_FREE_SPACE( bh ) ); \
2099 PROC_INFO_ADD( sb, items_at[ ( level ) ], B_NR_ITEMS( bh ) )
2100#else
Alexey Dobriyane3c96f52009-12-15 16:46:54 -08002101static inline int reiserfs_proc_info_init(struct super_block *sb)
2102{
2103 return 0;
2104}
2105
2106static inline int reiserfs_proc_info_done(struct super_block *sb)
2107{
2108 return 0;
2109}
2110
2111static inline int reiserfs_proc_info_global_init(void)
2112{
2113 return 0;
2114}
2115
2116static inline int reiserfs_proc_info_global_done(void)
2117{
2118 return 0;
2119}
2120
Linus Torvalds1da177e2005-04-16 15:20:36 -07002121#define PROC_EXP( e )
2122#define VOID_V ( ( void ) 0 )
2123#define PROC_INFO_MAX( sb, field, value ) VOID_V
2124#define PROC_INFO_INC( sb, field ) VOID_V
2125#define PROC_INFO_ADD( sb, field, val ) VOID_V
Jeff Mahoneyad31a4f2009-03-30 14:02:46 -04002126#define PROC_INFO_BH_STAT(sb, bh, n_node_level) VOID_V
Linus Torvalds1da177e2005-04-16 15:20:36 -07002127#endif
2128
2129/* dir.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002130extern const struct inode_operations reiserfs_dir_inode_operations;
2131extern const struct inode_operations reiserfs_symlink_inode_operations;
2132extern const struct inode_operations reiserfs_special_inode_operations;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002133extern const struct file_operations reiserfs_dir_operations;
Jeff Mahoneya41f1a42009-03-30 14:02:40 -04002134int reiserfs_readdir_dentry(struct dentry *, void *, filldir_t, loff_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002135
2136/* tail_conversion.c */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002137int direct2indirect(struct reiserfs_transaction_handle *, struct inode *,
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08002138 struct treepath *, struct buffer_head *, loff_t);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002139int indirect2direct(struct reiserfs_transaction_handle *, struct inode *,
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08002140 struct page *, struct treepath *, const struct cpu_key *,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002141 loff_t, char *);
2142void reiserfs_unmap_buffer(struct buffer_head *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002143
2144/* file.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002145extern const struct inode_operations reiserfs_file_inode_operations;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002146extern const struct file_operations reiserfs_file_operations;
Christoph Hellwigf5e54d62006-06-28 04:26:44 -07002147extern const struct address_space_operations reiserfs_address_space_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002148
2149/* fix_nodes.c */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002150
Jeff Mahoneya063ae12009-03-30 14:02:48 -04002151int fix_nodes(int n_op_mode, struct tree_balance *tb,
Jeff Mahoneyd68caa92009-03-30 14:02:49 -04002152 struct item_head *ins_ih, const void *);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002153void unfix_nodes(struct tree_balance *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002154
2155/* prints.c */
Jeff Mahoneyc3a9c212009-03-30 14:02:25 -04002156void __reiserfs_panic(struct super_block *s, const char *id,
2157 const char *function, const char *fmt, ...)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002158 __attribute__ ((noreturn));
Jeff Mahoneyc3a9c212009-03-30 14:02:25 -04002159#define reiserfs_panic(s, id, fmt, args...) \
2160 __reiserfs_panic(s, id, __func__, fmt, ##args)
Jeff Mahoney1e5e59d2009-03-30 14:02:27 -04002161void __reiserfs_error(struct super_block *s, const char *id,
2162 const char *function, const char *fmt, ...);
2163#define reiserfs_error(s, id, fmt, args...) \
2164 __reiserfs_error(s, id, __func__, fmt, ##args)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002165void reiserfs_info(struct super_block *s, const char *fmt, ...);
2166void reiserfs_debug(struct super_block *s, int level, const char *fmt, ...);
2167void print_indirect_item(struct buffer_head *bh, int item_num);
2168void store_print_tb(struct tree_balance *tb);
2169void print_cur_tb(char *mes);
2170void print_de(struct reiserfs_dir_entry *de);
2171void print_bi(struct buffer_info *bi, char *mes);
2172#define PRINT_LEAF_ITEMS 1 /* print all items */
2173#define PRINT_DIRECTORY_ITEMS 2 /* print directory items */
2174#define PRINT_DIRECT_ITEMS 4 /* print contents of direct items */
2175void print_block(struct buffer_head *bh, ...);
2176void print_bmap(struct super_block *s, int silent);
2177void print_bmap_block(int i, char *data, int size, int silent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002178/*void print_super_block (struct super_block * s, char * mes);*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002179void print_objectid_map(struct super_block *s);
2180void print_block_head(struct buffer_head *bh, char *mes);
2181void check_leaf(struct buffer_head *bh);
2182void check_internal(struct buffer_head *bh);
2183void print_statistics(struct super_block *s);
2184char *reiserfs_hashname(int code);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002185
2186/* lbalance.c */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002187int leaf_move_items(int shift_mode, struct tree_balance *tb, int mov_num,
2188 int mov_bytes, struct buffer_head *Snew);
2189int leaf_shift_left(struct tree_balance *tb, int shift_num, int shift_bytes);
2190int leaf_shift_right(struct tree_balance *tb, int shift_num, int shift_bytes);
2191void leaf_delete_items(struct buffer_info *cur_bi, int last_first, int first,
2192 int del_num, int del_bytes);
2193void leaf_insert_into_buf(struct buffer_info *bi, int before,
2194 struct item_head *inserted_item_ih,
2195 const char *inserted_item_body, int zeros_number);
2196void leaf_paste_in_buffer(struct buffer_info *bi, int pasted_item_num,
2197 int pos_in_item, int paste_size, const char *body,
2198 int zeros_number);
2199void leaf_cut_from_buffer(struct buffer_info *bi, int cut_item_num,
2200 int pos_in_item, int cut_size);
Jeff Mahoneyeba00302009-03-30 14:02:18 -04002201void leaf_paste_entries(struct buffer_info *bi, int item_num, int before,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002202 int new_entry_count, struct reiserfs_de_head *new_dehs,
2203 const char *records, int paste_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002204/* ibalance.c */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002205int balance_internal(struct tree_balance *, int, int, struct item_head *,
2206 struct buffer_head **);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002207
2208/* do_balance.c */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002209void do_balance_mark_leaf_dirty(struct tree_balance *tb,
2210 struct buffer_head *bh, int flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002211#define do_balance_mark_internal_dirty do_balance_mark_leaf_dirty
2212#define do_balance_mark_sb_dirty do_balance_mark_leaf_dirty
2213
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002214void do_balance(struct tree_balance *tb, struct item_head *ih,
2215 const char *body, int flag);
2216void reiserfs_invalidate_buffer(struct tree_balance *tb,
2217 struct buffer_head *bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002218
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002219int get_left_neighbor_position(struct tree_balance *tb, int h);
2220int get_right_neighbor_position(struct tree_balance *tb, int h);
2221void replace_key(struct tree_balance *tb, struct buffer_head *, int,
2222 struct buffer_head *, int);
2223void make_empty_node(struct buffer_info *);
2224struct buffer_head *get_FEB(struct tree_balance *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002225
2226/* bitmap.c */
2227
2228/* structure contains hints for block allocator, and it is a container for
2229 * arguments, such as node, search path, transaction_handle, etc. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002230struct __reiserfs_blocknr_hint {
2231 struct inode *inode; /* inode passed to allocator, if we allocate unf. nodes */
Jeff Mahoney3ee16672007-10-18 23:39:25 -07002232 sector_t block; /* file offset, in blocks */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002233 struct in_core_key key;
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08002234 struct treepath *path; /* search path, used by allocator to deternine search_start by
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002235 * various ways */
2236 struct reiserfs_transaction_handle *th; /* transaction handle is needed to log super blocks and
2237 * bitmap blocks changes */
2238 b_blocknr_t beg, end;
2239 b_blocknr_t search_start; /* a field used to transfer search start value (block number)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002240 * between different block allocator procedures
2241 * (determine_search_start() and others) */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002242 int prealloc_size; /* is set in determine_prealloc_size() function, used by underlayed
2243 * function that do actual allocation */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002244
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002245 unsigned formatted_node:1; /* the allocator uses different polices for getting disk space for
Linus Torvalds1da177e2005-04-16 15:20:36 -07002246 * formatted/unformatted blocks with/without preallocation */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002247 unsigned preallocate:1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002248};
2249
2250typedef struct __reiserfs_blocknr_hint reiserfs_blocknr_hint_t;
2251
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002252int reiserfs_parse_alloc_options(struct super_block *, char *);
2253void reiserfs_init_alloc_options(struct super_block *s);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002254
2255/*
2256 * given a directory, this will tell you what packing locality
2257 * to use for a new object underneat it. The locality is returned
2258 * in disk byte order (le).
2259 */
Al Viro3e8962b2005-05-01 08:59:18 -07002260__le32 reiserfs_choose_packing(struct inode *dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002261
Jeff Mahoney6f010462006-09-30 23:28:43 -07002262int reiserfs_init_bitmap_cache(struct super_block *sb);
2263void reiserfs_free_bitmap_cache(struct super_block *sb);
2264void reiserfs_cache_bitmap_metadata(struct super_block *sb, struct buffer_head *bh, struct reiserfs_bitmap_info *info);
2265struct buffer_head *reiserfs_read_bitmap_block(struct super_block *sb, unsigned int bitmap);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002266int is_reusable(struct super_block *s, b_blocknr_t block, int bit_value);
2267void reiserfs_free_block(struct reiserfs_transaction_handle *th, struct inode *,
2268 b_blocknr_t, int for_unformatted);
2269int reiserfs_allocate_blocknrs(reiserfs_blocknr_hint_t *, b_blocknr_t *, int,
2270 int);
Adrian Bunk9adeb1b2005-09-10 00:27:18 -07002271static inline int reiserfs_new_form_blocknrs(struct tree_balance *tb,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002272 b_blocknr_t * new_blocknrs,
2273 int amount_needed)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002274{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002275 reiserfs_blocknr_hint_t hint = {
2276 .th = tb->transaction_handle,
2277 .path = tb->tb_path,
2278 .inode = NULL,
2279 .key = tb->key,
2280 .block = 0,
2281 .formatted_node = 1
2282 };
2283 return reiserfs_allocate_blocknrs(&hint, new_blocknrs, amount_needed,
2284 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002285}
2286
Adrian Bunk9adeb1b2005-09-10 00:27:18 -07002287static inline int reiserfs_new_unf_blocknrs(struct reiserfs_transaction_handle
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002288 *th, struct inode *inode,
2289 b_blocknr_t * new_blocknrs,
Jeff Mahoney3ee16672007-10-18 23:39:25 -07002290 struct treepath *path,
2291 sector_t block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002292{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002293 reiserfs_blocknr_hint_t hint = {
2294 .th = th,
2295 .path = path,
2296 .inode = inode,
2297 .block = block,
2298 .formatted_node = 0,
2299 .preallocate = 0
2300 };
2301 return reiserfs_allocate_blocknrs(&hint, new_blocknrs, 1, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002302}
2303
2304#ifdef REISERFS_PREALLOCATE
Adrian Bunk9adeb1b2005-09-10 00:27:18 -07002305static inline int reiserfs_new_unf_blocknrs2(struct reiserfs_transaction_handle
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002306 *th, struct inode *inode,
2307 b_blocknr_t * new_blocknrs,
Jeff Mahoney3ee16672007-10-18 23:39:25 -07002308 struct treepath *path,
2309 sector_t block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002310{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002311 reiserfs_blocknr_hint_t hint = {
2312 .th = th,
2313 .path = path,
2314 .inode = inode,
2315 .block = block,
2316 .formatted_node = 0,
2317 .preallocate = 1
2318 };
2319 return reiserfs_allocate_blocknrs(&hint, new_blocknrs, 1, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002320}
2321
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002322void reiserfs_discard_prealloc(struct reiserfs_transaction_handle *th,
2323 struct inode *inode);
2324void reiserfs_discard_all_prealloc(struct reiserfs_transaction_handle *th);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002325#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002326
2327/* hashes.c */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002328__u32 keyed_hash(const signed char *msg, int len);
2329__u32 yura_hash(const signed char *msg, int len);
2330__u32 r5_hash(const signed char *msg, int len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002331
2332/* the ext2 bit routines adjust for big or little endian as
2333** appropriate for the arch, so in our laziness we use them rather
2334** than using the bit routines they call more directly. These
2335** routines must be used when changing on disk bitmaps. */
2336#define reiserfs_test_and_set_le_bit ext2_set_bit
2337#define reiserfs_test_and_clear_le_bit ext2_clear_bit
2338#define reiserfs_test_le_bit ext2_test_bit
2339#define reiserfs_find_next_zero_le_bit ext2_find_next_zero_bit
2340
2341/* sometimes reiserfs_truncate may require to allocate few new blocks
2342 to perform indirect2direct conversion. People probably used to
2343 think, that truncate should work without problems on a filesystem
2344 without free disk space. They may complain that they can not
2345 truncate due to lack of free disk space. This spare space allows us
2346 to not worry about it. 500 is probably too much, but it should be
2347 absolutely safe */
2348#define SPARE_SPACE 500
2349
Linus Torvalds1da177e2005-04-16 15:20:36 -07002350/* prototypes from ioctl.c */
Frederic Weisbecker205cb372009-10-14 23:22:17 +02002351long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
David Howells52b499c2006-08-29 19:06:18 +01002352long reiserfs_compat_ioctl(struct file *filp,
2353 unsigned int cmd, unsigned long arg);
Jan Karad5dee5c2008-04-28 02:16:23 -07002354int reiserfs_unpack(struct inode *inode, struct file *filp);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002355
Jaswinder Singh Rajput11d9f652009-02-02 21:45:41 +05302356#endif /* __KERNEL__ */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002357
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002358#endif /* _LINUX_REISER_FS_H */