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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>
15#ifdef __KERNEL__
16#include <linux/slab.h>
17#include <linux/interrupt.h>
18#include <linux/sched.h>
19#include <linux/workqueue.h>
20#include <asm/unaligned.h>
21#include <linux/bitops.h>
22#include <linux/proc_fs.h>
23#include <linux/smp_lock.h>
24#include <linux/buffer_head.h>
25#include <linux/reiserfs_fs_i.h>
26#include <linux/reiserfs_fs_sb.h>
27#endif
28
29/*
30 * include/linux/reiser_fs.h
31 *
32 * Reiser File System constants and structures
33 *
34 */
35
36/* in reading the #defines, it may help to understand that they employ
37 the following abbreviations:
38
39 B = Buffer
40 I = Item header
41 H = Height within the tree (should be changed to LEV)
42 N = Number of the item in the node
43 STAT = stat data
44 DEH = Directory Entry Header
45 EC = Entry Count
46 E = Entry number
47 UL = Unsigned Long
48 BLKH = BLocK Header
49 UNFM = UNForMatted node
50 DC = Disk Child
51 P = Path
52
53 These #defines are named by concatenating these abbreviations,
54 where first comes the arguments, and last comes the return value,
55 of the macro.
56
57*/
58
59#define USE_INODE_GENERATION_COUNTER
60
61#define REISERFS_PREALLOCATE
62#define DISPLACE_NEW_PACKING_LOCALITIES
63#define PREALLOCATION_SIZE 9
64
65/* n must be power of 2 */
66#define _ROUND_UP(x,n) (((x)+(n)-1u) & ~((n)-1u))
67
68// to be ok for alpha and others we have to align structures to 8 byte
69// boundary.
70// FIXME: do not change 4 by anything else: there is code which relies on that
71#define ROUND_UP(x) _ROUND_UP(x,8LL)
72
73/* debug levels. Right now, CONFIG_REISERFS_CHECK means print all debug
74** messages.
75*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070076#define REISERFS_DEBUG_CODE 5 /* extra messages to help find/debug errors */
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070078void reiserfs_warning(struct super_block *s, const char *fmt, ...);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079/* assertions handling */
80
81/** always check a condition and panic if it's false. */
82#define RASSERT( cond, format, args... ) \
83if( !( cond ) ) \
84 reiserfs_panic( NULL, "reiserfs[%i]: assertion " #cond " failed at " \
85 __FILE__ ":%i:%s: " format "\n", \
86 in_interrupt() ? -1 : current -> pid, __LINE__ , __FUNCTION__ , ##args )
87
88#if defined( CONFIG_REISERFS_CHECK )
89#define RFALSE( cond, format, args... ) RASSERT( !( cond ), format, ##args )
90#else
91#define RFALSE( cond, format, args... ) do {;} while( 0 )
92#endif
93
94#define CONSTF __attribute_const__
95/*
96 * Disk Data Structures
97 */
98
99/***************************************************************************/
100/* SUPER BLOCK */
101/***************************************************************************/
102
103/*
104 * Structure of super block on disk, a version of which in RAM is often accessed as REISERFS_SB(s)->s_rs
105 * the version in RAM is part of a larger structure containing fields never written to disk.
106 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700107#define UNSET_HASH 0 // read_super will guess about, what hash names
108 // in directories were sorted with
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109#define TEA_HASH 1
110#define YURA_HASH 2
111#define R5_HASH 3
112#define DEFAULT_HASH R5_HASH
113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114struct journal_params {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700115 __le32 jp_journal_1st_block; /* where does journal start from on its
116 * device */
117 __le32 jp_journal_dev; /* journal device st_rdev */
118 __le32 jp_journal_size; /* size of the journal */
119 __le32 jp_journal_trans_max; /* max number of blocks in a transaction. */
120 __le32 jp_journal_magic; /* random value made on fs creation (this
121 * was sb_journal_block_count) */
122 __le32 jp_journal_max_batch; /* max number of blocks to batch into a
123 * trans */
124 __le32 jp_journal_max_commit_age; /* in seconds, how old can an async
125 * commit be */
126 __le32 jp_journal_max_trans_age; /* in seconds, how old can a transaction
127 * be */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128};
129
130/* this is the super from 3.5.X, where X >= 10 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700131struct reiserfs_super_block_v1 {
132 __le32 s_block_count; /* blocks count */
133 __le32 s_free_blocks; /* free blocks count */
134 __le32 s_root_block; /* root block number */
135 struct journal_params s_journal;
136 __le16 s_blocksize; /* block size */
137 __le16 s_oid_maxsize; /* max size of object id array, see
138 * get_objectid() commentary */
139 __le16 s_oid_cursize; /* current size of object id array */
140 __le16 s_umount_state; /* this is set to 1 when filesystem was
141 * umounted, to 2 - when not */
142 char s_magic[10]; /* reiserfs magic string indicates that
143 * file system is reiserfs:
144 * "ReIsErFs" or "ReIsEr2Fs" or "ReIsEr3Fs" */
145 __le16 s_fs_state; /* it is set to used by fsck to mark which
146 * phase of rebuilding is done */
147 __le32 s_hash_function_code; /* indicate, what hash function is being use
148 * to sort names in a directory*/
149 __le16 s_tree_height; /* height of disk tree */
150 __le16 s_bmap_nr; /* amount of bitmap blocks needed to address
151 * each block of file system */
152 __le16 s_version; /* this field is only reliable on filesystem
153 * with non-standard journal */
154 __le16 s_reserved_for_journal; /* size in blocks of journal area on main
155 * device, we need to keep after
156 * making fs with non-standard journal */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157} __attribute__ ((__packed__));
158
159#define SB_SIZE_V1 (sizeof(struct reiserfs_super_block_v1))
160
161/* this is the on disk super block */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700162struct reiserfs_super_block {
163 struct reiserfs_super_block_v1 s_v1;
164 __le32 s_inode_generation;
165 __le32 s_flags; /* Right now used only by inode-attributes, if enabled */
166 unsigned char s_uuid[16]; /* filesystem unique identifier */
167 unsigned char s_label[16]; /* filesystem volume label */
168 char s_unused[88]; /* zero filled by mkreiserfs and
169 * reiserfs_convert_objectid_map_v1()
170 * so any additions must be updated
171 * there as well. */
172} __attribute__ ((__packed__));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
174#define SB_SIZE (sizeof(struct reiserfs_super_block))
175
176#define REISERFS_VERSION_1 0
177#define REISERFS_VERSION_2 2
178
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179// on-disk super block fields converted to cpu form
180#define SB_DISK_SUPER_BLOCK(s) (REISERFS_SB(s)->s_rs)
181#define SB_V1_DISK_SUPER_BLOCK(s) (&(SB_DISK_SUPER_BLOCK(s)->s_v1))
182#define SB_BLOCKSIZE(s) \
183 le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_blocksize))
184#define SB_BLOCK_COUNT(s) \
185 le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_block_count))
186#define SB_FREE_BLOCKS(s) \
187 le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_free_blocks))
188#define SB_REISERFS_MAGIC(s) \
189 (SB_V1_DISK_SUPER_BLOCK(s)->s_magic)
190#define SB_ROOT_BLOCK(s) \
191 le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_root_block))
192#define SB_TREE_HEIGHT(s) \
193 le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_tree_height))
194#define SB_REISERFS_STATE(s) \
195 le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_umount_state))
196#define SB_VERSION(s) le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_version))
197#define SB_BMAP_NR(s) le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_bmap_nr))
198
199#define PUT_SB_BLOCK_COUNT(s, val) \
200 do { SB_V1_DISK_SUPER_BLOCK(s)->s_block_count = cpu_to_le32(val); } while (0)
201#define PUT_SB_FREE_BLOCKS(s, val) \
202 do { SB_V1_DISK_SUPER_BLOCK(s)->s_free_blocks = cpu_to_le32(val); } while (0)
203#define PUT_SB_ROOT_BLOCK(s, val) \
204 do { SB_V1_DISK_SUPER_BLOCK(s)->s_root_block = cpu_to_le32(val); } while (0)
205#define PUT_SB_TREE_HEIGHT(s, val) \
206 do { SB_V1_DISK_SUPER_BLOCK(s)->s_tree_height = cpu_to_le16(val); } while (0)
207#define PUT_SB_REISERFS_STATE(s, val) \
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700208 do { SB_V1_DISK_SUPER_BLOCK(s)->s_umount_state = cpu_to_le16(val); } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209#define PUT_SB_VERSION(s, val) \
210 do { SB_V1_DISK_SUPER_BLOCK(s)->s_version = cpu_to_le16(val); } while (0)
211#define PUT_SB_BMAP_NR(s, val) \
212 do { SB_V1_DISK_SUPER_BLOCK(s)->s_bmap_nr = cpu_to_le16 (val); } while (0)
213
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214#define SB_ONDISK_JP(s) (&SB_V1_DISK_SUPER_BLOCK(s)->s_journal)
215#define SB_ONDISK_JOURNAL_SIZE(s) \
216 le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_size))
217#define SB_ONDISK_JOURNAL_1st_BLOCK(s) \
218 le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_1st_block))
219#define SB_ONDISK_JOURNAL_DEVICE(s) \
220 le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_dev))
221#define SB_ONDISK_RESERVED_FOR_JOURNAL(s) \
Al Virob8cc9362005-05-01 08:59:18 -0700222 le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_reserved_for_journal))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224#define is_block_in_log_or_reserved_area(s, block) \
225 block >= SB_JOURNAL_1st_RESERVED_BLOCK(s) \
226 && block < SB_JOURNAL_1st_RESERVED_BLOCK(s) + \
227 ((!is_reiserfs_jr(SB_DISK_SUPER_BLOCK(s)) ? \
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700228 SB_ONDISK_JOURNAL_SIZE(s) + 1 : SB_ONDISK_RESERVED_FOR_JOURNAL(s)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
230 /* used by gcc */
231#define REISERFS_SUPER_MAGIC 0x52654973
232 /* used by file system utilities that
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700233 look at the superblock, etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234#define REISERFS_SUPER_MAGIC_STRING "ReIsErFs"
235#define REISER2FS_SUPER_MAGIC_STRING "ReIsEr2Fs"
236#define REISER2FS_JR_SUPER_MAGIC_STRING "ReIsEr3Fs"
237
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700238int is_reiserfs_3_5(struct reiserfs_super_block *rs);
239int is_reiserfs_3_6(struct reiserfs_super_block *rs);
240int is_reiserfs_jr(struct reiserfs_super_block *rs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
242/* ReiserFS leaves the first 64k unused, so that partition labels have
243 enough space. If someone wants to write a fancy bootloader that
244 needs more than 64k, let us know, and this will be increased in size.
245 This number must be larger than than the largest block size on any
246 platform, or code will break. -Hans */
247#define REISERFS_DISK_OFFSET_IN_BYTES (64 * 1024)
248#define REISERFS_FIRST_BLOCK unused_define
249#define REISERFS_JOURNAL_OFFSET_IN_BYTES REISERFS_DISK_OFFSET_IN_BYTES
250
251/* the spot for the super in versions 3.5 - 3.5.10 (inclusive) */
252#define REISERFS_OLD_DISK_OFFSET_IN_BYTES (8 * 1024)
253
254// reiserfs internal error code (used by search_by_key adn fix_nodes))
255#define CARRY_ON 0
256#define REPEAT_SEARCH -1
257#define IO_ERROR -2
258#define NO_DISK_SPACE -3
259#define NO_BALANCING_NEEDED (-4)
260#define NO_MORE_UNUSED_CONTIGUOUS_BLOCKS (-5)
261#define QUOTA_EXCEEDED -6
262
263typedef __u32 b_blocknr_t;
Al Viro3e8962b2005-05-01 08:59:18 -0700264typedef __le32 unp_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266struct unfm_nodeinfo {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700267 unp_t unfm_nodenum;
268 unsigned short unfm_freespace;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269};
270
271/* there are two formats of keys: 3.5 and 3.6
272 */
273#define KEY_FORMAT_3_5 0
274#define KEY_FORMAT_3_6 1
275
276/* there are two stat datas */
277#define STAT_DATA_V1 0
278#define STAT_DATA_V2 1
279
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280static inline struct reiserfs_inode_info *REISERFS_I(const struct inode *inode)
281{
282 return container_of(inode, struct reiserfs_inode_info, vfs_inode);
283}
284
285static inline struct reiserfs_sb_info *REISERFS_SB(const struct super_block *sb)
286{
287 return sb->s_fs_info;
288}
289
290/** this says about version of key of all items (but stat data) the
291 object consists of */
292#define get_inode_item_key_version( inode ) \
293 ((REISERFS_I(inode)->i_flags & i_item_key_version_mask) ? KEY_FORMAT_3_6 : KEY_FORMAT_3_5)
294
295#define set_inode_item_key_version( inode, version ) \
296 ({ if((version)==KEY_FORMAT_3_6) \
297 REISERFS_I(inode)->i_flags |= i_item_key_version_mask; \
298 else \
299 REISERFS_I(inode)->i_flags &= ~i_item_key_version_mask; })
300
301#define get_inode_sd_version(inode) \
302 ((REISERFS_I(inode)->i_flags & i_stat_data_version_mask) ? STAT_DATA_V2 : STAT_DATA_V1)
303
304#define set_inode_sd_version(inode, version) \
305 ({ if((version)==STAT_DATA_V2) \
306 REISERFS_I(inode)->i_flags |= i_stat_data_version_mask; \
307 else \
308 REISERFS_I(inode)->i_flags &= ~i_stat_data_version_mask; })
309
310/* This is an aggressive tail suppression policy, I am hoping it
311 improves our benchmarks. The principle behind it is that percentage
312 space saving is what matters, not absolute space saving. This is
313 non-intuitive, but it helps to understand it if you consider that the
314 cost to access 4 blocks is not much more than the cost to access 1
315 block, if you have to do a seek and rotate. A tail risks a
316 non-linear disk access that is significant as a percentage of total
317 time cost for a 4 block file and saves an amount of space that is
318 less significant as a percentage of space, or so goes the hypothesis.
319 -Hans */
320#define STORE_TAIL_IN_UNFM_S1(n_file_size,n_tail_size,n_block_size) \
321(\
322 (!(n_tail_size)) || \
323 (((n_tail_size) > MAX_DIRECT_ITEM_LEN(n_block_size)) || \
324 ( (n_file_size) >= (n_block_size) * 4 ) || \
325 ( ( (n_file_size) >= (n_block_size) * 3 ) && \
326 ( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size))/4) ) || \
327 ( ( (n_file_size) >= (n_block_size) * 2 ) && \
328 ( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size))/2) ) || \
329 ( ( (n_file_size) >= (n_block_size) ) && \
330 ( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size) * 3)/4) ) ) \
331)
332
333/* Another strategy for tails, this one means only create a tail if all the
334 file would fit into one DIRECT item.
335 Primary intention for this one is to increase performance by decreasing
336 seeking.
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700337*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338#define STORE_TAIL_IN_UNFM_S2(n_file_size,n_tail_size,n_block_size) \
339(\
340 (!(n_tail_size)) || \
341 (((n_file_size) > MAX_DIRECT_ITEM_LEN(n_block_size)) ) \
342)
343
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344/*
345 * values for s_umount_state field
346 */
347#define REISERFS_VALID_FS 1
348#define REISERFS_ERROR_FS 2
349
350//
351// there are 5 item types currently
352//
353#define TYPE_STAT_DATA 0
354#define TYPE_INDIRECT 1
355#define TYPE_DIRECT 2
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700356#define TYPE_DIRENTRY 3
357#define TYPE_MAXTYPE 3
358#define TYPE_ANY 15 // FIXME: comment is required
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359
360/***************************************************************************/
361/* KEY & ITEM HEAD */
362/***************************************************************************/
363
364//
365// directories use this key as well as old files
366//
367struct offset_v1 {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700368 __le32 k_offset;
369 __le32 k_uniqueness;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370} __attribute__ ((__packed__));
371
372struct offset_v2 {
Al Virof8e08a82005-05-01 08:59:19 -0700373 __le64 v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374} __attribute__ ((__packed__));
375
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700376static inline __u16 offset_v2_k_type(const struct offset_v2 *v2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377{
Al Virof8e08a82005-05-01 08:59:19 -0700378 __u8 type = le64_to_cpu(v2->v) >> 60;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700379 return (type <= TYPE_MAXTYPE) ? type : TYPE_ANY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380}
381
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700382static inline void set_offset_v2_k_type(struct offset_v2 *v2, int type)
383{
384 v2->v =
385 (v2->v & cpu_to_le64(~0ULL >> 4)) | cpu_to_le64((__u64) type << 60);
386}
387
388static inline loff_t offset_v2_k_offset(const struct offset_v2 *v2)
389{
390 return le64_to_cpu(v2->v) & (~0ULL >> 4);
391}
392
393static inline void set_offset_v2_k_offset(struct offset_v2 *v2, loff_t offset)
394{
395 offset &= (~0ULL >> 4);
396 v2->v = (v2->v & cpu_to_le64(15ULL << 60)) | cpu_to_le64(offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
399/* Key of an item determines its location in the S+tree, and
400 is composed of 4 components */
401struct reiserfs_key {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700402 __le32 k_dir_id; /* packing locality: by default parent
403 directory object id */
404 __le32 k_objectid; /* object identifier */
405 union {
406 struct offset_v1 k_offset_v1;
407 struct offset_v2 k_offset_v2;
408 } __attribute__ ((__packed__)) u;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409} __attribute__ ((__packed__));
410
Al Viro6a3a16f2005-05-01 08:59:17 -0700411struct in_core_key {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700412 __u32 k_dir_id; /* packing locality: by default parent
413 directory object id */
414 __u32 k_objectid; /* object identifier */
415 __u64 k_offset;
416 __u8 k_type;
Al Viro6b9f5822005-05-01 08:59:19 -0700417};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
419struct cpu_key {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700420 struct in_core_key on_disk_key;
421 int version;
422 int key_length; /* 3 in all cases but direct2indirect and
423 indirect2direct conversion */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424};
425
426/* Our function for comparing keys can compare keys of different
427 lengths. It takes as a parameter the length of the keys it is to
428 compare. These defines are used in determining what is to be passed
429 to it as that parameter. */
430#define REISERFS_FULL_KEY_LEN 4
431#define REISERFS_SHORT_KEY_LEN 2
432
433/* The result of the key compare */
434#define FIRST_GREATER 1
435#define SECOND_GREATER -1
436#define KEYS_IDENTICAL 0
437#define KEY_FOUND 1
438#define KEY_NOT_FOUND 0
439
440#define KEY_SIZE (sizeof(struct reiserfs_key))
441#define SHORT_KEY_SIZE (sizeof (__u32) + sizeof (__u32))
442
443/* return values for search_by_key and clones */
444#define ITEM_FOUND 1
445#define ITEM_NOT_FOUND 0
446#define ENTRY_FOUND 1
447#define ENTRY_NOT_FOUND 0
448#define DIRECTORY_NOT_FOUND -1
449#define REGULAR_FILE_FOUND -2
450#define DIRECTORY_FOUND -3
451#define BYTE_FOUND 1
452#define BYTE_NOT_FOUND 0
453#define FILE_NOT_FOUND -1
454
455#define POSITION_FOUND 1
456#define POSITION_NOT_FOUND 0
457
458// return values for reiserfs_find_entry and search_by_entry_key
459#define NAME_FOUND 1
460#define NAME_NOT_FOUND 0
461#define GOTO_PREVIOUS_ITEM 2
462#define NAME_FOUND_INVISIBLE 3
463
464/* Everything in the filesystem is stored as a set of items. The
465 item head contains the key of the item, its free space (for
466 indirect items) and specifies the location of the item itself
467 within the block. */
468
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700469struct item_head {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 /* Everything in the tree is found by searching for it based on
471 * its key.*/
472 struct reiserfs_key ih_key;
473 union {
474 /* The free space in the last unformatted node of an
475 indirect item if this is an indirect item. This
476 equals 0xFFFF iff this is a direct item or stat data
477 item. Note that the key, not this field, is used to
478 determine the item type, and thus which field this
479 union contains. */
Al Viro3e8962b2005-05-01 08:59:18 -0700480 __le16 ih_free_space_reserved;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 /* Iff this is a directory item, this field equals the
482 number of directory entries in the directory item. */
Al Viro3e8962b2005-05-01 08:59:18 -0700483 __le16 ih_entry_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 } __attribute__ ((__packed__)) u;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700485 __le16 ih_item_len; /* total size of the item body */
486 __le16 ih_item_location; /* an offset to the item body
487 * within the block */
488 __le16 ih_version; /* 0 for all old items, 2 for new
489 ones. Highest bit is set by fsck
490 temporary, cleaned after all
491 done */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492} __attribute__ ((__packed__));
493/* size of item header */
494#define IH_SIZE (sizeof(struct item_head))
495
496#define ih_free_space(ih) le16_to_cpu((ih)->u.ih_free_space_reserved)
497#define ih_version(ih) le16_to_cpu((ih)->ih_version)
498#define ih_entry_count(ih) le16_to_cpu((ih)->u.ih_entry_count)
499#define ih_location(ih) le16_to_cpu((ih)->ih_item_location)
500#define ih_item_len(ih) le16_to_cpu((ih)->ih_item_len)
501
502#define put_ih_free_space(ih, val) do { (ih)->u.ih_free_space_reserved = cpu_to_le16(val); } while(0)
503#define put_ih_version(ih, val) do { (ih)->ih_version = cpu_to_le16(val); } while (0)
504#define put_ih_entry_count(ih, val) do { (ih)->u.ih_entry_count = cpu_to_le16(val); } while (0)
505#define put_ih_location(ih, val) do { (ih)->ih_item_location = cpu_to_le16(val); } while (0)
506#define put_ih_item_len(ih, val) do { (ih)->ih_item_len = cpu_to_le16(val); } while (0)
507
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508#define unreachable_item(ih) (ih_version(ih) & (1 << 15))
509
510#define get_ih_free_space(ih) (ih_version (ih) == KEY_FORMAT_3_6 ? 0 : ih_free_space (ih))
511#define set_ih_free_space(ih,val) put_ih_free_space((ih), ((ih_version(ih) == KEY_FORMAT_3_6) ? 0 : (val)))
512
513/* these operate on indirect items, where you've got an array of ints
514** at a possibly unaligned location. These are a noop on ia32
515**
516** p is the array of __u32, i is the index into the array, v is the value
517** to store there.
518*/
519#define get_block_num(p, i) le32_to_cpu(get_unaligned((p) + (i)))
520#define put_block_num(p, i, v) put_unaligned(cpu_to_le32(v), (p) + (i))
521
522//
523// in old version uniqueness field shows key type
524//
525#define V1_SD_UNIQUENESS 0
526#define V1_INDIRECT_UNIQUENESS 0xfffffffe
527#define V1_DIRECT_UNIQUENESS 0xffffffff
528#define V1_DIRENTRY_UNIQUENESS 500
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700529#define V1_ANY_UNIQUENESS 555 // FIXME: comment is required
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
531//
532// here are conversion routines
533//
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700534static inline int uniqueness2type(__u32 uniqueness) CONSTF;
535static inline int uniqueness2type(__u32 uniqueness)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700537 switch ((int)uniqueness) {
538 case V1_SD_UNIQUENESS:
539 return TYPE_STAT_DATA;
540 case V1_INDIRECT_UNIQUENESS:
541 return TYPE_INDIRECT;
542 case V1_DIRECT_UNIQUENESS:
543 return TYPE_DIRECT;
544 case V1_DIRENTRY_UNIQUENESS:
545 return TYPE_DIRENTRY;
546 default:
547 reiserfs_warning(NULL, "vs-500: unknown uniqueness %d",
548 uniqueness);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 case V1_ANY_UNIQUENESS:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700550 return TYPE_ANY;
551 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552}
553
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700554static inline __u32 type2uniqueness(int type) CONSTF;
555static inline __u32 type2uniqueness(int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700557 switch (type) {
558 case TYPE_STAT_DATA:
559 return V1_SD_UNIQUENESS;
560 case TYPE_INDIRECT:
561 return V1_INDIRECT_UNIQUENESS;
562 case TYPE_DIRECT:
563 return V1_DIRECT_UNIQUENESS;
564 case TYPE_DIRENTRY:
565 return V1_DIRENTRY_UNIQUENESS;
566 default:
567 reiserfs_warning(NULL, "vs-501: unknown type %d", type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 case TYPE_ANY:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700569 return V1_ANY_UNIQUENESS;
570 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571}
572
573//
574// key is pointer to on disk key which is stored in le, result is cpu,
575// there is no way to get version of object from key, so, provide
576// version to these defines
577//
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700578static inline loff_t le_key_k_offset(int version,
579 const struct reiserfs_key *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700581 return (version == KEY_FORMAT_3_5) ?
582 le32_to_cpu(key->u.k_offset_v1.k_offset) :
583 offset_v2_k_offset(&(key->u.k_offset_v2));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584}
585
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700586static inline loff_t le_ih_k_offset(const struct item_head *ih)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700588 return le_key_k_offset(ih_version(ih), &(ih->ih_key));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589}
590
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700591static inline loff_t le_key_k_type(int version, const struct reiserfs_key *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700593 return (version == KEY_FORMAT_3_5) ?
594 uniqueness2type(le32_to_cpu(key->u.k_offset_v1.k_uniqueness)) :
595 offset_v2_k_type(&(key->u.k_offset_v2));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596}
597
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700598static inline loff_t le_ih_k_type(const struct item_head *ih)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700600 return le_key_k_type(ih_version(ih), &(ih->ih_key));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601}
602
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700603static inline void set_le_key_k_offset(int version, struct reiserfs_key *key,
604 loff_t offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700606 (version == KEY_FORMAT_3_5) ? (void)(key->u.k_offset_v1.k_offset = cpu_to_le32(offset)) : /* jdm check */
607 (void)(set_offset_v2_k_offset(&(key->u.k_offset_v2), offset));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608}
609
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700610static inline void set_le_ih_k_offset(struct item_head *ih, loff_t offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700612 set_le_key_k_offset(ih_version(ih), &(ih->ih_key), offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613}
614
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700615static inline void set_le_key_k_type(int version, struct reiserfs_key *key,
616 int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700618 (version == KEY_FORMAT_3_5) ?
619 (void)(key->u.k_offset_v1.k_uniqueness =
620 cpu_to_le32(type2uniqueness(type)))
621 : (void)(set_offset_v2_k_type(&(key->u.k_offset_v2), type));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700623static inline void set_le_ih_k_type(struct item_head *ih, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700625 set_le_key_k_type(ih_version(ih), &(ih->ih_key), type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626}
627
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628#define is_direntry_le_key(version,key) (le_key_k_type (version, key) == TYPE_DIRENTRY)
629#define is_direct_le_key(version,key) (le_key_k_type (version, key) == TYPE_DIRECT)
630#define is_indirect_le_key(version,key) (le_key_k_type (version, key) == TYPE_INDIRECT)
631#define is_statdata_le_key(version,key) (le_key_k_type (version, key) == TYPE_STAT_DATA)
632
633//
634// item header has version.
635//
636#define is_direntry_le_ih(ih) is_direntry_le_key (ih_version (ih), &((ih)->ih_key))
637#define is_direct_le_ih(ih) is_direct_le_key (ih_version (ih), &((ih)->ih_key))
638#define is_indirect_le_ih(ih) is_indirect_le_key (ih_version(ih), &((ih)->ih_key))
639#define is_statdata_le_ih(ih) is_statdata_le_key (ih_version (ih), &((ih)->ih_key))
640
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641//
642// key is pointer to cpu key, result is cpu
643//
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700644static inline loff_t cpu_key_k_offset(const struct cpu_key *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700646 return key->on_disk_key.k_offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647}
648
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700649static inline loff_t cpu_key_k_type(const struct cpu_key *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700651 return key->on_disk_key.k_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652}
653
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700654static inline void set_cpu_key_k_offset(struct cpu_key *key, loff_t offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655{
Al Viro6b9f5822005-05-01 08:59:19 -0700656 key->on_disk_key.k_offset = offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657}
658
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700659static inline void set_cpu_key_k_type(struct cpu_key *key, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660{
Al Viro6b9f5822005-05-01 08:59:19 -0700661 key->on_disk_key.k_type = type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662}
663
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700664static inline void cpu_key_k_offset_dec(struct cpu_key *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700666 key->on_disk_key.k_offset--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667}
668
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669#define is_direntry_cpu_key(key) (cpu_key_k_type (key) == TYPE_DIRENTRY)
670#define is_direct_cpu_key(key) (cpu_key_k_type (key) == TYPE_DIRECT)
671#define is_indirect_cpu_key(key) (cpu_key_k_type (key) == TYPE_INDIRECT)
672#define is_statdata_cpu_key(key) (cpu_key_k_type (key) == TYPE_STAT_DATA)
673
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674/* are these used ? */
675#define is_direntry_cpu_ih(ih) (is_direntry_cpu_key (&((ih)->ih_key)))
676#define is_direct_cpu_ih(ih) (is_direct_cpu_key (&((ih)->ih_key)))
677#define is_indirect_cpu_ih(ih) (is_indirect_cpu_key (&((ih)->ih_key)))
678#define is_statdata_cpu_ih(ih) (is_statdata_cpu_key (&((ih)->ih_key)))
679
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680#define I_K_KEY_IN_ITEM(p_s_ih, p_s_key, n_blocksize) \
681 ( ! COMP_SHORT_KEYS(p_s_ih, p_s_key) && \
682 I_OFF_BYTE_IN_ITEM(p_s_ih, k_offset (p_s_key), n_blocksize) )
683
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700684/* maximal length of item */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685#define MAX_ITEM_LEN(block_size) (block_size - BLKH_SIZE - IH_SIZE)
686#define MIN_ITEM_LEN 1
687
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688/* object identifier for root dir */
689#define REISERFS_ROOT_OBJECTID 2
690#define REISERFS_ROOT_PARENT_OBJECTID 1
691extern struct reiserfs_key root_key;
692
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693/*
694 * Picture represents a leaf of the S+tree
695 * ______________________________________________________
696 * | | Array of | | |
697 * |Block | Object-Item | F r e e | Objects- |
698 * | head | Headers | S p a c e | Items |
699 * |______|_______________|___________________|___________|
700 */
701
702/* Header of a disk block. More precisely, header of a formatted leaf
703 or internal node, and not the header of an unformatted node. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700704struct block_head {
705 __le16 blk_level; /* Level of a block in the tree. */
706 __le16 blk_nr_item; /* Number of keys/items in a block. */
707 __le16 blk_free_space; /* Block free space in bytes. */
708 __le16 blk_reserved;
709 /* dump this in v4/planA */
710 struct reiserfs_key blk_right_delim_key; /* kept only for compatibility */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711};
712
713#define BLKH_SIZE (sizeof(struct block_head))
714#define blkh_level(p_blkh) (le16_to_cpu((p_blkh)->blk_level))
715#define blkh_nr_item(p_blkh) (le16_to_cpu((p_blkh)->blk_nr_item))
716#define blkh_free_space(p_blkh) (le16_to_cpu((p_blkh)->blk_free_space))
717#define blkh_reserved(p_blkh) (le16_to_cpu((p_blkh)->blk_reserved))
718#define set_blkh_level(p_blkh,val) ((p_blkh)->blk_level = cpu_to_le16(val))
719#define set_blkh_nr_item(p_blkh,val) ((p_blkh)->blk_nr_item = cpu_to_le16(val))
720#define set_blkh_free_space(p_blkh,val) ((p_blkh)->blk_free_space = cpu_to_le16(val))
721#define set_blkh_reserved(p_blkh,val) ((p_blkh)->blk_reserved = cpu_to_le16(val))
722#define blkh_right_delim_key(p_blkh) ((p_blkh)->blk_right_delim_key)
723#define set_blkh_right_delim_key(p_blkh,val) ((p_blkh)->blk_right_delim_key = val)
724
725/*
726 * values for blk_level field of the struct block_head
727 */
728
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700729#define FREE_LEVEL 0 /* when node gets removed from the tree its
730 blk_level is set to FREE_LEVEL. It is then
731 used to see whether the node is still in the
732 tree */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700734#define DISK_LEAF_NODE_LEVEL 1 /* Leaf node level. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735
736/* Given the buffer head of a formatted node, resolve to the block head of that node. */
737#define B_BLK_HEAD(p_s_bh) ((struct block_head *)((p_s_bh)->b_data))
738/* Number of items that are in buffer. */
739#define B_NR_ITEMS(p_s_bh) (blkh_nr_item(B_BLK_HEAD(p_s_bh)))
740#define B_LEVEL(p_s_bh) (blkh_level(B_BLK_HEAD(p_s_bh)))
741#define B_FREE_SPACE(p_s_bh) (blkh_free_space(B_BLK_HEAD(p_s_bh)))
742
743#define PUT_B_NR_ITEMS(p_s_bh,val) do { set_blkh_nr_item(B_BLK_HEAD(p_s_bh),val); } while (0)
744#define PUT_B_LEVEL(p_s_bh,val) do { set_blkh_level(B_BLK_HEAD(p_s_bh),val); } while (0)
745#define PUT_B_FREE_SPACE(p_s_bh,val) do { set_blkh_free_space(B_BLK_HEAD(p_s_bh),val); } while (0)
746
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747/* Get right delimiting key. -- little endian */
748#define B_PRIGHT_DELIM_KEY(p_s_bh) (&(blk_right_delim_key(B_BLK_HEAD(p_s_bh))
749
750/* Does the buffer contain a disk leaf. */
751#define B_IS_ITEMS_LEVEL(p_s_bh) (B_LEVEL(p_s_bh) == DISK_LEAF_NODE_LEVEL)
752
753/* Does the buffer contain a disk internal node */
754#define B_IS_KEYS_LEVEL(p_s_bh) (B_LEVEL(p_s_bh) > DISK_LEAF_NODE_LEVEL \
755 && B_LEVEL(p_s_bh) <= MAX_HEIGHT)
756
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757/***************************************************************************/
758/* STAT DATA */
759/***************************************************************************/
760
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761//
762// old stat data is 32 bytes long. We are going to distinguish new one by
763// different size
764//
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700765struct stat_data_v1 {
766 __le16 sd_mode; /* file type, permissions */
767 __le16 sd_nlink; /* number of hard links */
768 __le16 sd_uid; /* owner */
769 __le16 sd_gid; /* group */
770 __le32 sd_size; /* file size */
771 __le32 sd_atime; /* time of last access */
772 __le32 sd_mtime; /* time file was last modified */
773 __le32 sd_ctime; /* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */
774 union {
775 __le32 sd_rdev;
776 __le32 sd_blocks; /* number of blocks file uses */
777 } __attribute__ ((__packed__)) u;
778 __le32 sd_first_direct_byte; /* first byte of file which is stored
779 in a direct item: except that if it
780 equals 1 it is a symlink and if it
781 equals ~(__u32)0 there is no
782 direct item. The existence of this
783 field really grates on me. Let's
784 replace it with a macro based on
785 sd_size and our tail suppression
786 policy. Someday. -Hans */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787} __attribute__ ((__packed__));
788
789#define SD_V1_SIZE (sizeof(struct stat_data_v1))
790#define stat_data_v1(ih) (ih_version (ih) == KEY_FORMAT_3_5)
791#define sd_v1_mode(sdp) (le16_to_cpu((sdp)->sd_mode))
792#define set_sd_v1_mode(sdp,v) ((sdp)->sd_mode = cpu_to_le16(v))
793#define sd_v1_nlink(sdp) (le16_to_cpu((sdp)->sd_nlink))
794#define set_sd_v1_nlink(sdp,v) ((sdp)->sd_nlink = cpu_to_le16(v))
795#define sd_v1_uid(sdp) (le16_to_cpu((sdp)->sd_uid))
796#define set_sd_v1_uid(sdp,v) ((sdp)->sd_uid = cpu_to_le16(v))
797#define sd_v1_gid(sdp) (le16_to_cpu((sdp)->sd_gid))
798#define set_sd_v1_gid(sdp,v) ((sdp)->sd_gid = cpu_to_le16(v))
799#define sd_v1_size(sdp) (le32_to_cpu((sdp)->sd_size))
800#define set_sd_v1_size(sdp,v) ((sdp)->sd_size = cpu_to_le32(v))
801#define sd_v1_atime(sdp) (le32_to_cpu((sdp)->sd_atime))
802#define set_sd_v1_atime(sdp,v) ((sdp)->sd_atime = cpu_to_le32(v))
803#define sd_v1_mtime(sdp) (le32_to_cpu((sdp)->sd_mtime))
804#define set_sd_v1_mtime(sdp,v) ((sdp)->sd_mtime = cpu_to_le32(v))
805#define sd_v1_ctime(sdp) (le32_to_cpu((sdp)->sd_ctime))
806#define set_sd_v1_ctime(sdp,v) ((sdp)->sd_ctime = cpu_to_le32(v))
807#define sd_v1_rdev(sdp) (le32_to_cpu((sdp)->u.sd_rdev))
808#define set_sd_v1_rdev(sdp,v) ((sdp)->u.sd_rdev = cpu_to_le32(v))
809#define sd_v1_blocks(sdp) (le32_to_cpu((sdp)->u.sd_blocks))
810#define set_sd_v1_blocks(sdp,v) ((sdp)->u.sd_blocks = cpu_to_le32(v))
811#define sd_v1_first_direct_byte(sdp) \
812 (le32_to_cpu((sdp)->sd_first_direct_byte))
813#define set_sd_v1_first_direct_byte(sdp,v) \
814 ((sdp)->sd_first_direct_byte = cpu_to_le32(v))
815
816#include <linux/ext2_fs.h>
817
818/* inode flags stored in sd_attrs (nee sd_reserved) */
819
820/* we want common flags to have the same values as in ext2,
821 so chattr(1) will work without problems */
822#define REISERFS_IMMUTABLE_FL EXT2_IMMUTABLE_FL
823#define REISERFS_APPEND_FL EXT2_APPEND_FL
824#define REISERFS_SYNC_FL EXT2_SYNC_FL
825#define REISERFS_NOATIME_FL EXT2_NOATIME_FL
826#define REISERFS_NODUMP_FL EXT2_NODUMP_FL
827#define REISERFS_SECRM_FL EXT2_SECRM_FL
828#define REISERFS_UNRM_FL EXT2_UNRM_FL
829#define REISERFS_COMPR_FL EXT2_COMPR_FL
830#define REISERFS_NOTAIL_FL EXT2_NOTAIL_FL
831
832/* persistent flags that file inherits from the parent directory */
833#define REISERFS_INHERIT_MASK ( REISERFS_IMMUTABLE_FL | \
834 REISERFS_SYNC_FL | \
835 REISERFS_NOATIME_FL | \
836 REISERFS_NODUMP_FL | \
837 REISERFS_SECRM_FL | \
838 REISERFS_COMPR_FL | \
839 REISERFS_NOTAIL_FL )
840
841/* Stat Data on disk (reiserfs version of UFS disk inode minus the
842 address blocks) */
843struct stat_data {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700844 __le16 sd_mode; /* file type, permissions */
845 __le16 sd_attrs; /* persistent inode flags */
846 __le32 sd_nlink; /* number of hard links */
847 __le64 sd_size; /* file size */
848 __le32 sd_uid; /* owner */
849 __le32 sd_gid; /* group */
850 __le32 sd_atime; /* time of last access */
851 __le32 sd_mtime; /* time file was last modified */
852 __le32 sd_ctime; /* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */
853 __le32 sd_blocks;
854 union {
855 __le32 sd_rdev;
856 __le32 sd_generation;
857 //__le32 sd_first_direct_byte;
858 /* first byte of file which is stored in a
859 direct item: except that if it equals 1
860 it is a symlink and if it equals
861 ~(__u32)0 there is no direct item. The
862 existence of this field really grates
863 on me. Let's replace it with a macro
864 based on sd_size and our tail
865 suppression policy? */
866 } __attribute__ ((__packed__)) u;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867} __attribute__ ((__packed__));
868//
869// this is 44 bytes long
870//
871#define SD_SIZE (sizeof(struct stat_data))
872#define SD_V2_SIZE SD_SIZE
873#define stat_data_v2(ih) (ih_version (ih) == KEY_FORMAT_3_6)
874#define sd_v2_mode(sdp) (le16_to_cpu((sdp)->sd_mode))
875#define set_sd_v2_mode(sdp,v) ((sdp)->sd_mode = cpu_to_le16(v))
876/* sd_reserved */
877/* set_sd_reserved */
878#define sd_v2_nlink(sdp) (le32_to_cpu((sdp)->sd_nlink))
879#define set_sd_v2_nlink(sdp,v) ((sdp)->sd_nlink = cpu_to_le32(v))
880#define sd_v2_size(sdp) (le64_to_cpu((sdp)->sd_size))
881#define set_sd_v2_size(sdp,v) ((sdp)->sd_size = cpu_to_le64(v))
882#define sd_v2_uid(sdp) (le32_to_cpu((sdp)->sd_uid))
883#define set_sd_v2_uid(sdp,v) ((sdp)->sd_uid = cpu_to_le32(v))
884#define sd_v2_gid(sdp) (le32_to_cpu((sdp)->sd_gid))
885#define set_sd_v2_gid(sdp,v) ((sdp)->sd_gid = cpu_to_le32(v))
886#define sd_v2_atime(sdp) (le32_to_cpu((sdp)->sd_atime))
887#define set_sd_v2_atime(sdp,v) ((sdp)->sd_atime = cpu_to_le32(v))
888#define sd_v2_mtime(sdp) (le32_to_cpu((sdp)->sd_mtime))
889#define set_sd_v2_mtime(sdp,v) ((sdp)->sd_mtime = cpu_to_le32(v))
890#define sd_v2_ctime(sdp) (le32_to_cpu((sdp)->sd_ctime))
891#define set_sd_v2_ctime(sdp,v) ((sdp)->sd_ctime = cpu_to_le32(v))
892#define sd_v2_blocks(sdp) (le32_to_cpu((sdp)->sd_blocks))
893#define set_sd_v2_blocks(sdp,v) ((sdp)->sd_blocks = cpu_to_le32(v))
894#define sd_v2_rdev(sdp) (le32_to_cpu((sdp)->u.sd_rdev))
895#define set_sd_v2_rdev(sdp,v) ((sdp)->u.sd_rdev = cpu_to_le32(v))
896#define sd_v2_generation(sdp) (le32_to_cpu((sdp)->u.sd_generation))
897#define set_sd_v2_generation(sdp,v) ((sdp)->u.sd_generation = cpu_to_le32(v))
898#define sd_v2_attrs(sdp) (le16_to_cpu((sdp)->sd_attrs))
899#define set_sd_v2_attrs(sdp,v) ((sdp)->sd_attrs = cpu_to_le16(v))
900
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901/***************************************************************************/
902/* DIRECTORY STRUCTURE */
903/***************************************************************************/
904/*
905 Picture represents the structure of directory items
906 ________________________________________________
907 | Array of | | | | | |
908 | directory |N-1| N-2 | .... | 1st |0th|
909 | entry headers | | | | | |
910 |_______________|___|_____|________|_______|___|
911 <---- directory entries ------>
912
913 First directory item has k_offset component 1. We store "." and ".."
914 in one item, always, we never split "." and ".." into differing
915 items. This makes, among other things, the code for removing
916 directories simpler. */
917#define SD_OFFSET 0
918#define SD_UNIQUENESS 0
919#define DOT_OFFSET 1
920#define DOT_DOT_OFFSET 2
921#define DIRENTRY_UNIQUENESS 500
922
923/* */
924#define FIRST_ITEM_OFFSET 1
925
926/*
927 Q: How to get key of object pointed to by entry from entry?
928
929 A: Each directory entry has its header. This header has deh_dir_id and deh_objectid fields, those are key
930 of object, entry points to */
931
932/* NOT IMPLEMENTED:
933 Directory will someday contain stat data of object */
934
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700935struct reiserfs_de_head {
936 __le32 deh_offset; /* third component of the directory entry key */
937 __le32 deh_dir_id; /* objectid of the parent directory of the object, that is referenced
938 by directory entry */
939 __le32 deh_objectid; /* objectid of the object, that is referenced by directory entry */
940 __le16 deh_location; /* offset of name in the whole item */
941 __le16 deh_state; /* whether 1) entry contains stat data (for future), and 2) whether
942 entry is hidden (unlinked) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943} __attribute__ ((__packed__));
944#define DEH_SIZE sizeof(struct reiserfs_de_head)
945#define deh_offset(p_deh) (le32_to_cpu((p_deh)->deh_offset))
946#define deh_dir_id(p_deh) (le32_to_cpu((p_deh)->deh_dir_id))
947#define deh_objectid(p_deh) (le32_to_cpu((p_deh)->deh_objectid))
948#define deh_location(p_deh) (le16_to_cpu((p_deh)->deh_location))
949#define deh_state(p_deh) (le16_to_cpu((p_deh)->deh_state))
950
951#define put_deh_offset(p_deh,v) ((p_deh)->deh_offset = cpu_to_le32((v)))
952#define put_deh_dir_id(p_deh,v) ((p_deh)->deh_dir_id = cpu_to_le32((v)))
953#define put_deh_objectid(p_deh,v) ((p_deh)->deh_objectid = cpu_to_le32((v)))
954#define put_deh_location(p_deh,v) ((p_deh)->deh_location = cpu_to_le16((v)))
955#define put_deh_state(p_deh,v) ((p_deh)->deh_state = cpu_to_le16((v)))
956
957/* empty directory contains two entries "." and ".." and their headers */
958#define EMPTY_DIR_SIZE \
959(DEH_SIZE * 2 + ROUND_UP (strlen (".")) + ROUND_UP (strlen ("..")))
960
961/* old format directories have this size when empty */
962#define EMPTY_DIR_SIZE_V1 (DEH_SIZE * 2 + 3)
963
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700964#define DEH_Statdata 0 /* not used now */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965#define DEH_Visible 2
966
967/* 64 bit systems (and the S/390) need to be aligned explicitly -jdm */
968#if BITS_PER_LONG == 64 || defined(__s390__) || defined(__hppa__)
969# define ADDR_UNALIGNED_BITS (3)
970#endif
971
972/* These are only used to manipulate deh_state.
973 * Because of this, we'll use the ext2_ bit routines,
974 * since they are little endian */
975#ifdef ADDR_UNALIGNED_BITS
976
977# define aligned_address(addr) ((void *)((long)(addr) & ~((1UL << ADDR_UNALIGNED_BITS) - 1)))
978# define unaligned_offset(addr) (((int)((long)(addr) & ((1 << ADDR_UNALIGNED_BITS) - 1))) << 3)
979
980# define set_bit_unaligned(nr, addr) ext2_set_bit((nr) + unaligned_offset(addr), aligned_address(addr))
981# define clear_bit_unaligned(nr, addr) ext2_clear_bit((nr) + unaligned_offset(addr), aligned_address(addr))
982# define test_bit_unaligned(nr, addr) ext2_test_bit((nr) + unaligned_offset(addr), aligned_address(addr))
983
984#else
985
986# define set_bit_unaligned(nr, addr) ext2_set_bit(nr, addr)
987# define clear_bit_unaligned(nr, addr) ext2_clear_bit(nr, addr)
988# define test_bit_unaligned(nr, addr) ext2_test_bit(nr, addr)
989
990#endif
991
992#define mark_de_with_sd(deh) set_bit_unaligned (DEH_Statdata, &((deh)->deh_state))
993#define mark_de_without_sd(deh) clear_bit_unaligned (DEH_Statdata, &((deh)->deh_state))
994#define mark_de_visible(deh) set_bit_unaligned (DEH_Visible, &((deh)->deh_state))
995#define mark_de_hidden(deh) clear_bit_unaligned (DEH_Visible, &((deh)->deh_state))
996
997#define de_with_sd(deh) test_bit_unaligned (DEH_Statdata, &((deh)->deh_state))
998#define de_visible(deh) test_bit_unaligned (DEH_Visible, &((deh)->deh_state))
999#define de_hidden(deh) !test_bit_unaligned (DEH_Visible, &((deh)->deh_state))
1000
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001001extern void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid,
1002 __le32 par_dirid, __le32 par_objid);
1003extern void make_empty_dir_item(char *body, __le32 dirid, __le32 objid,
1004 __le32 par_dirid, __le32 par_objid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005
1006/* array of the entry headers */
1007 /* get item body */
1008#define B_I_PITEM(bh,ih) ( (bh)->b_data + ih_location(ih) )
1009#define B_I_DEH(bh,ih) ((struct reiserfs_de_head *)(B_I_PITEM(bh,ih)))
1010
1011/* length of the directory entry in directory item. This define
1012 calculates length of i-th directory entry using directory entry
1013 locations from dir entry head. When it calculates length of 0-th
1014 directory entry, it uses length of whole item in place of entry
1015 location of the non-existent following entry in the calculation.
1016 See picture above.*/
1017/*
1018#define I_DEH_N_ENTRY_LENGTH(ih,deh,i) \
1019((i) ? (deh_location((deh)-1) - deh_location((deh))) : (ih_item_len((ih)) - deh_location((deh))))
1020*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001021static inline int entry_length(const struct buffer_head *bh,
1022 const struct item_head *ih, int pos_in_item)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001024 struct reiserfs_de_head *deh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001026 deh = B_I_DEH(bh, ih) + pos_in_item;
1027 if (pos_in_item)
1028 return deh_location(deh - 1) - deh_location(deh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001030 return ih_item_len(ih) - deh_location(deh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031}
1032
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033/* number of entries in the directory item, depends on ENTRY_COUNT being at the start of directory dynamic data. */
1034#define I_ENTRY_COUNT(ih) (ih_entry_count((ih)))
1035
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036/* name by bh, ih and entry_num */
1037#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))))
1038
1039// two entries per block (at least)
1040#define REISERFS_MAX_NAME(block_size) 255
1041
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042/* this structure is used for operations on directory entries. It is
1043 not a disk structure. */
1044/* When reiserfs_find_entry or search_by_entry_key find directory
1045 entry, they return filled reiserfs_dir_entry structure */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001046struct reiserfs_dir_entry {
1047 struct buffer_head *de_bh;
1048 int de_item_num;
1049 struct item_head *de_ih;
1050 int de_entry_num;
1051 struct reiserfs_de_head *de_deh;
1052 int de_entrylen;
1053 int de_namelen;
1054 char *de_name;
Jeff Mahoney3af1efe2006-03-02 13:25:26 -05001055 unsigned long *de_gen_number_bit_string;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001057 __u32 de_dir_id;
1058 __u32 de_objectid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001060 struct cpu_key de_entry_key;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061};
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001062
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063/* these defines are useful when a particular member of a reiserfs_dir_entry is needed */
1064
1065/* pointer to file name, stored in entry */
1066#define B_I_DEH_ENTRY_FILE_NAME(bh,ih,deh) (B_I_PITEM (bh, ih) + deh_location(deh))
1067
1068/* length of name */
1069#define I_DEH_N_ENTRY_FILE_NAME_LENGTH(ih,deh,entry_num) \
1070(I_DEH_N_ENTRY_LENGTH (ih, deh, entry_num) - (de_with_sd (deh) ? SD_SIZE : 0))
1071
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072/* hash value occupies bits from 7 up to 30 */
1073#define GET_HASH_VALUE(offset) ((offset) & 0x7fffff80LL)
1074/* generation number occupies 7 bits starting from 0 up to 6 */
1075#define GET_GENERATION_NUMBER(offset) ((offset) & 0x7fLL)
1076#define MAX_GENERATION_NUMBER 127
1077
1078#define SET_GENERATION_NUMBER(offset,gen_number) (GET_HASH_VALUE(offset)|(gen_number))
1079
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080/*
1081 * Picture represents an internal node of the reiserfs tree
1082 * ______________________________________________________
1083 * | | Array of | Array of | Free |
1084 * |block | keys | pointers | space |
1085 * | head | N | N+1 | |
1086 * |______|_______________|___________________|___________|
1087 */
1088
1089/***************************************************************************/
1090/* DISK CHILD */
1091/***************************************************************************/
1092/* Disk child pointer: The pointer from an internal node of the tree
1093 to a node that is on disk. */
1094struct disk_child {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001095 __le32 dc_block_number; /* Disk child's block number. */
1096 __le16 dc_size; /* Disk child's used space. */
1097 __le16 dc_reserved;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098};
1099
1100#define DC_SIZE (sizeof(struct disk_child))
1101#define dc_block_number(dc_p) (le32_to_cpu((dc_p)->dc_block_number))
1102#define dc_size(dc_p) (le16_to_cpu((dc_p)->dc_size))
1103#define put_dc_block_number(dc_p, val) do { (dc_p)->dc_block_number = cpu_to_le32(val); } while(0)
1104#define put_dc_size(dc_p, val) do { (dc_p)->dc_size = cpu_to_le16(val); } while(0)
1105
1106/* Get disk child by buffer header and position in the tree node. */
1107#define B_N_CHILD(p_s_bh,n_pos) ((struct disk_child *)\
1108((p_s_bh)->b_data+BLKH_SIZE+B_NR_ITEMS(p_s_bh)*KEY_SIZE+DC_SIZE*(n_pos)))
1109
1110/* Get disk child number by buffer header and position in the tree node. */
1111#define B_N_CHILD_NUM(p_s_bh,n_pos) (dc_block_number(B_N_CHILD(p_s_bh,n_pos)))
1112#define PUT_B_N_CHILD_NUM(p_s_bh,n_pos, val) (put_dc_block_number(B_N_CHILD(p_s_bh,n_pos), val ))
1113
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001114 /* maximal value of field child_size in structure disk_child */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 /* child size is the combined size of all items and their headers */
1116#define MAX_CHILD_SIZE(bh) ((int)( (bh)->b_size - BLKH_SIZE ))
1117
1118/* amount of used space in buffer (not including block head) */
1119#define B_CHILD_SIZE(cur) (MAX_CHILD_SIZE(cur)-(B_FREE_SPACE(cur)))
1120
1121/* max and min number of keys in internal node */
1122#define MAX_NR_KEY(bh) ( (MAX_CHILD_SIZE(bh)-DC_SIZE)/(KEY_SIZE+DC_SIZE) )
1123#define MIN_NR_KEY(bh) (MAX_NR_KEY(bh)/2)
1124
1125/***************************************************************************/
1126/* PATH STRUCTURES AND DEFINES */
1127/***************************************************************************/
1128
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129/* Search_by_key fills up the path from the root to the leaf as it descends the tree looking for the
1130 key. It uses reiserfs_bread to try to find buffers in the cache given their block number. If it
1131 does not find them in the cache it reads them from disk. For each node search_by_key finds using
1132 reiserfs_bread it then uses bin_search to look through that node. bin_search will find the
1133 position of the block_number of the next node if it is looking through an internal node. If it
1134 is looking through a leaf node bin_search will find the position of the item which has key either
1135 equal to given key, or which is the maximal key less than the given key. */
1136
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001137struct path_element {
1138 struct buffer_head *pe_buffer; /* Pointer to the buffer at the path in the tree. */
1139 int pe_position; /* Position in the tree node which is placed in the */
1140 /* buffer above. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141};
1142
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001143#define MAX_HEIGHT 5 /* maximal height of a tree. don't change this without changing JOURNAL_PER_BALANCE_CNT */
1144#define EXTENDED_MAX_HEIGHT 7 /* Must be equals MAX_HEIGHT + FIRST_PATH_ELEMENT_OFFSET */
1145#define FIRST_PATH_ELEMENT_OFFSET 2 /* Must be equal to at least 2. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001147#define ILLEGAL_PATH_ELEMENT_OFFSET 1 /* Must be equal to FIRST_PATH_ELEMENT_OFFSET - 1 */
1148#define MAX_FEB_SIZE 6 /* this MUST be MAX_HEIGHT + 1. See about FEB below */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149
1150/* We need to keep track of who the ancestors of nodes are. When we
1151 perform a search we record which nodes were visited while
1152 descending the tree looking for the node we searched for. This list
1153 of nodes is called the path. This information is used while
1154 performing balancing. Note that this path information may become
1155 invalid, and this means we must check it when using it to see if it
1156 is still valid. You'll need to read search_by_key and the comments
1157 in it, especially about decrement_counters_in_path(), to understand
1158 this structure.
1159
1160Paths make the code so much harder to work with and debug.... An
1161enormous number of bugs are due to them, and trying to write or modify
1162code that uses them just makes my head hurt. They are based on an
1163excessive effort to avoid disturbing the precious VFS code.:-( The
1164gods only know how we are going to SMP the code that uses them.
1165znodes are the way! */
1166
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001167#define PATH_READA 0x1 /* do read ahead */
1168#define PATH_READA_BACK 0x2 /* read backwards */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001170struct path {
1171 int path_length; /* Length of the array above. */
1172 int reada;
1173 struct path_element path_elements[EXTENDED_MAX_HEIGHT]; /* Array of the path elements. */
1174 int pos_in_item;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175};
1176
1177#define pos_in_item(path) ((path)->pos_in_item)
1178
1179#define INITIALIZE_PATH(var) \
1180struct path var = {.path_length = ILLEGAL_PATH_ELEMENT_OFFSET, .reada = 0,}
1181
1182/* Get path element by path and path position. */
1183#define PATH_OFFSET_PELEMENT(p_s_path,n_offset) ((p_s_path)->path_elements +(n_offset))
1184
1185/* Get buffer header at the path by path and path position. */
1186#define PATH_OFFSET_PBUFFER(p_s_path,n_offset) (PATH_OFFSET_PELEMENT(p_s_path,n_offset)->pe_buffer)
1187
1188/* Get position in the element at the path by path and path position. */
1189#define PATH_OFFSET_POSITION(p_s_path,n_offset) (PATH_OFFSET_PELEMENT(p_s_path,n_offset)->pe_position)
1190
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191#define PATH_PLAST_BUFFER(p_s_path) (PATH_OFFSET_PBUFFER((p_s_path), (p_s_path)->path_length))
1192 /* you know, to the person who didn't
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001193 write this the macro name does not
1194 at first suggest what it does.
1195 Maybe POSITION_FROM_PATH_END? Or
1196 maybe we should just focus on
1197 dumping paths... -Hans */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198#define PATH_LAST_POSITION(p_s_path) (PATH_OFFSET_POSITION((p_s_path), (p_s_path)->path_length))
1199
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200#define PATH_PITEM_HEAD(p_s_path) B_N_PITEM_HEAD(PATH_PLAST_BUFFER(p_s_path),PATH_LAST_POSITION(p_s_path))
1201
1202/* in do_balance leaf has h == 0 in contrast with path structure,
1203 where root has level == 0. That is why we need these defines */
1204#define PATH_H_PBUFFER(p_s_path, h) PATH_OFFSET_PBUFFER (p_s_path, p_s_path->path_length - (h)) /* tb->S[h] */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001205#define PATH_H_PPARENT(path, h) PATH_H_PBUFFER (path, (h) + 1) /* tb->F[h] or tb->S[0]->b_parent */
1206#define PATH_H_POSITION(path, h) PATH_OFFSET_POSITION (path, path->path_length - (h))
1207#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 -07001208
1209#define PATH_H_PATH_OFFSET(p_s_path, n_h) ((p_s_path)->path_length - (n_h))
1210
1211#define get_last_bh(path) PATH_PLAST_BUFFER(path)
1212#define get_ih(path) PATH_PITEM_HEAD(path)
1213#define get_item_pos(path) PATH_LAST_POSITION(path)
1214#define get_item(path) ((void *)B_N_PITEM(PATH_PLAST_BUFFER(path), PATH_LAST_POSITION (path)))
1215#define item_moved(ih,path) comp_items(ih, path)
1216#define path_changed(ih,path) comp_items (ih, path)
1217
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218/***************************************************************************/
1219/* MISC */
1220/***************************************************************************/
1221
1222/* Size of pointer to the unformatted node. */
1223#define UNFM_P_SIZE (sizeof(unp_t))
1224#define UNFM_P_SHIFT 2
1225
1226// in in-core inode key is stored on le form
1227#define INODE_PKEY(inode) ((struct reiserfs_key *)(REISERFS_I(inode)->i_key))
1228
1229#define MAX_UL_INT 0xffffffff
1230#define MAX_INT 0x7ffffff
1231#define MAX_US_INT 0xffff
1232
1233// reiserfs version 2 has max offset 60 bits. Version 1 - 32 bit offset
1234#define U32_MAX (~(__u32)0)
1235
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001236static inline loff_t max_reiserfs_offset(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001238 if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5)
1239 return (loff_t) U32_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001241 return (loff_t) ((~(__u64) 0) >> 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242}
1243
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244/*#define MAX_KEY_UNIQUENESS MAX_UL_INT*/
1245#define MAX_KEY_OBJECTID MAX_UL_INT
1246
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247#define MAX_B_NUM MAX_UL_INT
1248#define MAX_FC_NUM MAX_US_INT
1249
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250/* the purpose is to detect overflow of an unsigned short */
1251#define REISERFS_LINK_MAX (MAX_US_INT - 1000)
1252
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253/* The following defines are used in reiserfs_insert_item and reiserfs_append_item */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001254#define REISERFS_KERNEL_MEM 0 /* reiserfs kernel memory mode */
1255#define REISERFS_USER_MEM 1 /* reiserfs user memory mode */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256
1257#define fs_generation(s) (REISERFS_SB(s)->s_generation_counter)
1258#define get_generation(s) atomic_read (&fs_generation(s))
1259#define FILESYSTEM_CHANGED_TB(tb) (get_generation((tb)->tb_sb) != (tb)->fs_gen)
1260#define __fs_changed(gen,s) (gen != get_generation (s))
1261#define fs_changed(gen,s) ({cond_resched(); __fs_changed(gen, s);})
1262
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263/***************************************************************************/
1264/* FIXATE NODES */
1265/***************************************************************************/
1266
1267#define VI_TYPE_LEFT_MERGEABLE 1
1268#define VI_TYPE_RIGHT_MERGEABLE 2
1269
1270/* To make any changes in the tree we always first find node, that
1271 contains item to be changed/deleted or place to insert a new
1272 item. We call this node S. To do balancing we need to decide what
1273 we will shift to left/right neighbor, or to a new node, where new
1274 item will be etc. To make this analysis simpler we build virtual
1275 node. Virtual node is an array of items, that will replace items of
1276 node S. (For instance if we are going to delete an item, virtual
1277 node does not contain it). Virtual node keeps information about
1278 item sizes and types, mergeability of first and last items, sizes
1279 of all entries in directory item. We use this array of items when
1280 calculating what we can shift to neighbors and how many nodes we
1281 have to have if we do not any shiftings, if we shift to left/right
1282 neighbor or to both. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001283struct virtual_item {
1284 int vi_index; // index in the array of item operations
1285 unsigned short vi_type; // left/right mergeability
1286 unsigned short vi_item_len; /* length of item that it will have after balancing */
1287 struct item_head *vi_ih;
1288 const char *vi_item; // body of item (old or new)
1289 const void *vi_new_data; // 0 always but paste mode
1290 void *vi_uarea; // item specific area
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291};
1292
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001293struct virtual_node {
1294 char *vn_free_ptr; /* this is a pointer to the free space in the buffer */
1295 unsigned short vn_nr_item; /* number of items in virtual node */
1296 short vn_size; /* size of node , that node would have if it has unlimited size and no balancing is performed */
1297 short vn_mode; /* mode of balancing (paste, insert, delete, cut) */
1298 short vn_affected_item_num;
1299 short vn_pos_in_item;
1300 struct item_head *vn_ins_ih; /* item header of inserted item, 0 for other modes */
1301 const void *vn_data;
1302 struct virtual_item *vn_vi; /* array of items (including a new one, excluding item to be deleted) */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303};
1304
1305/* used by directory items when creating virtual nodes */
1306struct direntry_uarea {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001307 int flags;
1308 __u16 entry_count;
1309 __u16 entry_sizes[1];
1310} __attribute__ ((__packed__));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311
1312/***************************************************************************/
1313/* TREE BALANCE */
1314/***************************************************************************/
1315
1316/* This temporary structure is used in tree balance algorithms, and
1317 constructed as we go to the extent that its various parts are
1318 needed. It contains arrays of nodes that can potentially be
1319 involved in the balancing of node S, and parameters that define how
1320 each of the nodes must be balanced. Note that in these algorithms
1321 for balancing the worst case is to need to balance the current node
1322 S and the left and right neighbors and all of their parents plus
1323 create a new node. We implement S1 balancing for the leaf nodes
1324 and S0 balancing for the internal nodes (S1 and S0 are defined in
1325 our papers.)*/
1326
1327#define MAX_FREE_BLOCK 7 /* size of the array of buffers to free at end of do_balance */
1328
1329/* maximum number of FEB blocknrs on a single level */
1330#define MAX_AMOUNT_NEEDED 2
1331
1332/* someday somebody will prefix every field in this struct with tb_ */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001333struct tree_balance {
1334 int tb_mode;
1335 int need_balance_dirty;
1336 struct super_block *tb_sb;
1337 struct reiserfs_transaction_handle *transaction_handle;
1338 struct path *tb_path;
1339 struct buffer_head *L[MAX_HEIGHT]; /* array of left neighbors of nodes in the path */
1340 struct buffer_head *R[MAX_HEIGHT]; /* array of right neighbors of nodes in the path */
1341 struct buffer_head *FL[MAX_HEIGHT]; /* array of fathers of the left neighbors */
1342 struct buffer_head *FR[MAX_HEIGHT]; /* array of fathers of the right neighbors */
1343 struct buffer_head *CFL[MAX_HEIGHT]; /* array of common parents of center node and its left neighbor */
1344 struct buffer_head *CFR[MAX_HEIGHT]; /* array of common parents of center node and its right neighbor */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001346 struct buffer_head *FEB[MAX_FEB_SIZE]; /* array of empty buffers. Number of buffers in array equals
1347 cur_blknum. */
1348 struct buffer_head *used[MAX_FEB_SIZE];
1349 struct buffer_head *thrown[MAX_FEB_SIZE];
1350 int lnum[MAX_HEIGHT]; /* array of number of items which must be
1351 shifted to the left in order to balance the
1352 current node; for leaves includes item that
1353 will be partially shifted; for internal
1354 nodes, it is the number of child pointers
1355 rather than items. It includes the new item
1356 being created. The code sometimes subtracts
1357 one to get the number of wholly shifted
1358 items for other purposes. */
1359 int rnum[MAX_HEIGHT]; /* substitute right for left in comment above */
1360 int lkey[MAX_HEIGHT]; /* array indexed by height h mapping the key delimiting L[h] and
1361 S[h] to its item number within the node CFL[h] */
1362 int rkey[MAX_HEIGHT]; /* substitute r for l in comment above */
1363 int insert_size[MAX_HEIGHT]; /* the number of bytes by we are trying to add or remove from
1364 S[h]. A negative value means removing. */
1365 int blknum[MAX_HEIGHT]; /* number of nodes that will replace node S[h] after
1366 balancing on the level h of the tree. If 0 then S is
1367 being deleted, if 1 then S is remaining and no new nodes
1368 are being created, if 2 or 3 then 1 or 2 new nodes is
1369 being created */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001371 /* fields that are used only for balancing leaves of the tree */
1372 int cur_blknum; /* number of empty blocks having been already allocated */
1373 int s0num; /* number of items that fall into left most node when S[0] splits */
1374 int s1num; /* number of items that fall into first new node when S[0] splits */
1375 int s2num; /* number of items that fall into second new node when S[0] splits */
1376 int lbytes; /* number of bytes which can flow to the left neighbor from the left */
1377 /* most liquid item that cannot be shifted from S[0] entirely */
1378 /* if -1 then nothing will be partially shifted */
1379 int rbytes; /* number of bytes which will flow to the right neighbor from the right */
1380 /* most liquid item that cannot be shifted from S[0] entirely */
1381 /* if -1 then nothing will be partially shifted */
1382 int s1bytes; /* number of bytes which flow to the first new node when S[0] splits */
1383 /* note: if S[0] splits into 3 nodes, then items do not need to be cut */
1384 int s2bytes;
1385 struct buffer_head *buf_to_free[MAX_FREE_BLOCK]; /* buffers which are to be freed after do_balance finishes by unfix_nodes */
1386 char *vn_buf; /* kmalloced memory. Used to create
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387 virtual node and keep map of
1388 dirtied bitmap blocks */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001389 int vn_buf_size; /* size of the vn_buf */
1390 struct virtual_node *tb_vn; /* VN starts after bitmap of bitmap blocks */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001392 int fs_gen; /* saved value of `reiserfs_generation' counter
1393 see FILESYSTEM_CHANGED() macro in reiserfs_fs.h */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394#ifdef DISPLACE_NEW_PACKING_LOCALITIES
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001395 struct in_core_key key; /* key pointer, to pass to block allocator or
1396 another low-level subsystem */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001398};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399
1400/* These are modes of balancing */
1401
1402/* When inserting an item. */
1403#define M_INSERT 'i'
1404/* When inserting into (directories only) or appending onto an already
1405 existant item. */
1406#define M_PASTE 'p'
1407/* When deleting an item. */
1408#define M_DELETE 'd'
1409/* When truncating an item or removing an entry from a (directory) item. */
1410#define M_CUT 'c'
1411
1412/* used when balancing on leaf level skipped (in reiserfsck) */
1413#define M_INTERNAL 'n'
1414
1415/* When further balancing is not needed, then do_balance does not need
1416 to be called. */
1417#define M_SKIP_BALANCING 's'
1418#define M_CONVERT 'v'
1419
1420/* modes of leaf_move_items */
1421#define LEAF_FROM_S_TO_L 0
1422#define LEAF_FROM_S_TO_R 1
1423#define LEAF_FROM_R_TO_L 2
1424#define LEAF_FROM_L_TO_R 3
1425#define LEAF_FROM_S_TO_SNEW 4
1426
1427#define FIRST_TO_LAST 0
1428#define LAST_TO_FIRST 1
1429
1430/* used in do_balance for passing parent of node information that has
1431 been gotten from tb struct */
1432struct buffer_info {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001433 struct tree_balance *tb;
1434 struct buffer_head *bi_bh;
1435 struct buffer_head *bi_parent;
1436 int bi_position;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437};
1438
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439/* there are 4 types of items: stat data, directory item, indirect, direct.
1440+-------------------+------------+--------------+------------+
1441| | k_offset | k_uniqueness | mergeable? |
1442+-------------------+------------+--------------+------------+
1443| stat data | 0 | 0 | no |
1444+-------------------+------------+--------------+------------+
1445| 1st directory item| DOT_OFFSET |DIRENTRY_UNIQUENESS| no |
1446| non 1st directory | hash value | | yes |
1447| item | | | |
1448+-------------------+------------+--------------+------------+
1449| indirect item | offset + 1 |TYPE_INDIRECT | if this is not the first indirect item of the object
1450+-------------------+------------+--------------+------------+
1451| direct item | offset + 1 |TYPE_DIRECT | if not this is not the first direct item of the object
1452+-------------------+------------+--------------+------------+
1453*/
1454
1455struct item_operations {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001456 int (*bytes_number) (struct item_head * ih, int block_size);
1457 void (*decrement_key) (struct cpu_key *);
1458 int (*is_left_mergeable) (struct reiserfs_key * ih,
1459 unsigned long bsize);
1460 void (*print_item) (struct item_head *, char *item);
1461 void (*check_item) (struct item_head *, char *item);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001463 int (*create_vi) (struct virtual_node * vn, struct virtual_item * vi,
1464 int is_affected, int insert_size);
1465 int (*check_left) (struct virtual_item * vi, int free,
1466 int start_skip, int end_skip);
1467 int (*check_right) (struct virtual_item * vi, int free);
1468 int (*part_size) (struct virtual_item * vi, int from, int to);
1469 int (*unit_num) (struct virtual_item * vi);
1470 void (*print_vi) (struct virtual_item * vi);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471};
1472
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001473extern struct item_operations *item_ops[TYPE_ANY + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474
1475#define op_bytes_number(ih,bsize) item_ops[le_ih_k_type (ih)]->bytes_number (ih, bsize)
1476#define op_is_left_mergeable(key,bsize) item_ops[le_key_k_type (le_key_version (key), key)]->is_left_mergeable (key, bsize)
1477#define op_print_item(ih,item) item_ops[le_ih_k_type (ih)]->print_item (ih, item)
1478#define op_check_item(ih,item) item_ops[le_ih_k_type (ih)]->check_item (ih, item)
1479#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)
1480#define op_check_left(vi,free,start_skip,end_skip) item_ops[(vi)->vi_index]->check_left (vi, free, start_skip, end_skip)
1481#define op_check_right(vi,free) item_ops[(vi)->vi_index]->check_right (vi, free)
1482#define op_part_size(vi,from,to) item_ops[(vi)->vi_index]->part_size (vi, from, to)
1483#define op_unit_num(vi) item_ops[(vi)->vi_index]->unit_num (vi)
1484#define op_print_vi(vi) item_ops[(vi)->vi_index]->print_vi (vi)
1485
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486#define COMP_SHORT_KEYS comp_short_keys
1487
1488/* number of blocks pointed to by the indirect item */
1489#define I_UNFM_NUM(p_s_ih) ( ih_item_len(p_s_ih) / UNFM_P_SIZE )
1490
1491/* the used space within the unformatted node corresponding to pos within the item pointed to by ih */
1492#define I_POS_UNFM_SIZE(ih,pos,size) (((pos) == I_UNFM_NUM(ih) - 1 ) ? (size) - ih_free_space(ih) : (size))
1493
1494/* number of bytes contained by the direct item or the unformatted nodes the indirect item points to */
1495
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001496/* get the item header */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497#define B_N_PITEM_HEAD(bh,item_num) ( (struct item_head * )((bh)->b_data + BLKH_SIZE) + (item_num) )
1498
1499/* get key */
1500#define B_N_PDELIM_KEY(bh,item_num) ( (struct reiserfs_key * )((bh)->b_data + BLKH_SIZE) + (item_num) )
1501
1502/* get the key */
1503#define B_N_PKEY(bh,item_num) ( &(B_N_PITEM_HEAD(bh,item_num)->ih_key) )
1504
1505/* get item body */
1506#define B_N_PITEM(bh,item_num) ( (bh)->b_data + ih_location(B_N_PITEM_HEAD((bh),(item_num))))
1507
1508/* get the stat data by the buffer header and the item order */
1509#define B_N_STAT_DATA(bh,nr) \
1510( (struct stat_data *)((bh)->b_data + ih_location(B_N_PITEM_HEAD((bh),(nr))) ) )
1511
1512 /* following defines use reiserfs buffer header and item header */
1513
1514/* get stat-data */
1515#define B_I_STAT_DATA(bh, ih) ( (struct stat_data * )((bh)->b_data + ih_location(ih)) )
1516
1517// this is 3976 for size==4096
1518#define MAX_DIRECT_ITEM_LEN(size) ((size) - BLKH_SIZE - 2*IH_SIZE - SD_SIZE - UNFM_P_SIZE)
1519
1520/* indirect items consist of entries which contain blocknrs, pos
1521 indicates which entry, and B_I_POS_UNFM_POINTER resolves to the
1522 blocknr contained by the entry pos points to */
1523#define B_I_POS_UNFM_POINTER(bh,ih,pos) le32_to_cpu(*(((unp_t *)B_I_PITEM(bh,ih)) + (pos)))
1524#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)
1525
1526struct reiserfs_iget_args {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001527 __u32 objectid;
1528 __u32 dirid;
1529};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530
1531/***************************************************************************/
1532/* FUNCTION DECLARATIONS */
1533/***************************************************************************/
1534
1535/*#ifdef __KERNEL__*/
1536#define get_journal_desc_magic(bh) (bh->b_data + bh->b_size - 12)
1537
1538#define journal_trans_half(blocksize) \
1539 ((blocksize - sizeof (struct reiserfs_journal_desc) + sizeof (__u32) - 12) / sizeof (__u32))
1540
1541/* journal.c see journal.c for all the comments here */
1542
1543/* first block written in a commit. */
1544struct reiserfs_journal_desc {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001545 __le32 j_trans_id; /* id of commit */
1546 __le32 j_len; /* length of commit. len +1 is the commit block */
1547 __le32 j_mount_id; /* mount id of this trans */
1548 __le32 j_realblock[1]; /* real locations for each block */
1549};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550
1551#define get_desc_trans_id(d) le32_to_cpu((d)->j_trans_id)
1552#define get_desc_trans_len(d) le32_to_cpu((d)->j_len)
1553#define get_desc_mount_id(d) le32_to_cpu((d)->j_mount_id)
1554
1555#define set_desc_trans_id(d,val) do { (d)->j_trans_id = cpu_to_le32 (val); } while (0)
1556#define set_desc_trans_len(d,val) do { (d)->j_len = cpu_to_le32 (val); } while (0)
1557#define set_desc_mount_id(d,val) do { (d)->j_mount_id = cpu_to_le32 (val); } while (0)
1558
1559/* last block written in a commit */
1560struct reiserfs_journal_commit {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001561 __le32 j_trans_id; /* must match j_trans_id from the desc block */
1562 __le32 j_len; /* ditto */
1563 __le32 j_realblock[1]; /* real locations for each block */
1564};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565
1566#define get_commit_trans_id(c) le32_to_cpu((c)->j_trans_id)
1567#define get_commit_trans_len(c) le32_to_cpu((c)->j_len)
1568#define get_commit_mount_id(c) le32_to_cpu((c)->j_mount_id)
1569
1570#define set_commit_trans_id(c,val) do { (c)->j_trans_id = cpu_to_le32 (val); } while (0)
1571#define set_commit_trans_len(c,val) do { (c)->j_len = cpu_to_le32 (val); } while (0)
1572
1573/* this header block gets written whenever a transaction is considered fully flushed, and is more recent than the
1574** last fully flushed transaction. fully flushed means all the log blocks and all the real blocks are on disk,
1575** and this transaction does not need to be replayed.
1576*/
1577struct reiserfs_journal_header {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001578 __le32 j_last_flush_trans_id; /* id of last fully flushed transaction */
1579 __le32 j_first_unflushed_offset; /* offset in the log of where to start replay after a crash */
1580 __le32 j_mount_id;
1581 /* 12 */ struct journal_params jh_journal;
1582};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583
1584/* biggest tunable defines are right here */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001585#define JOURNAL_BLOCK_COUNT 8192 /* number of blocks in the journal */
1586#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 -07001587#define JOURNAL_TRANS_MIN_DEFAULT 256
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001588#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 -07001589#define JOURNAL_MIN_RATIO 2
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001590#define JOURNAL_MAX_COMMIT_AGE 30
Linus Torvalds1da177e2005-04-16 15:20:36 -07001591#define JOURNAL_MAX_TRANS_AGE 30
1592#define JOURNAL_PER_BALANCE_CNT (3 * (MAX_HEIGHT-2) + 9)
1593#ifdef CONFIG_QUOTA
Jan Kara556a2a42005-06-23 22:01:06 -07001594/* We need to update data and inode (atime) */
1595#define REISERFS_QUOTA_TRANS_BLOCKS(s) (REISERFS_SB(s)->s_mount_opt & (1<<REISERFS_QUOTA) ? 2 : 0)
1596/* 1 balancing, 1 bitmap, 1 data per write + stat data update */
1597#define REISERFS_QUOTA_INIT_BLOCKS(s) (REISERFS_SB(s)->s_mount_opt & (1<<REISERFS_QUOTA) ? \
1598(DQUOT_INIT_ALLOC*(JOURNAL_PER_BALANCE_CNT+2)+DQUOT_INIT_REWRITE+1) : 0)
1599/* same as with INIT */
1600#define REISERFS_QUOTA_DEL_BLOCKS(s) (REISERFS_SB(s)->s_mount_opt & (1<<REISERFS_QUOTA) ? \
1601(DQUOT_DEL_ALLOC*(JOURNAL_PER_BALANCE_CNT+2)+DQUOT_DEL_REWRITE+1) : 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001602#else
Jan Kara556a2a42005-06-23 22:01:06 -07001603#define REISERFS_QUOTA_TRANS_BLOCKS(s) 0
1604#define REISERFS_QUOTA_INIT_BLOCKS(s) 0
1605#define REISERFS_QUOTA_DEL_BLOCKS(s) 0
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606#endif
1607
1608/* both of these can be as low as 1, or as high as you want. The min is the
1609** number of 4k bitmap nodes preallocated on mount. New nodes are allocated
1610** as needed, and released when transactions are committed. On release, if
1611** the current number of nodes is > max, the node is freed, otherwise,
1612** it is put on a free list for faster use later.
1613*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001614#define REISERFS_MIN_BITMAP_NODES 10
1615#define REISERFS_MAX_BITMAP_NODES 100
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001617#define JBH_HASH_SHIFT 13 /* these are based on journal hash size of 8192 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618#define JBH_HASH_MASK 8191
1619
1620#define _jhashfn(sb,block) \
1621 (((unsigned long)sb>>L1_CACHE_SHIFT) ^ \
1622 (((block)<<(JBH_HASH_SHIFT - 6)) ^ ((block) >> 13) ^ ((block) << (JBH_HASH_SHIFT - 12))))
1623#define journal_hash(t,sb,block) ((t)[_jhashfn((sb),(block)) & JBH_HASH_MASK])
1624
1625// We need these to make journal.c code more readable
1626#define journal_find_get_block(s, block) __find_get_block(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize)
1627#define journal_getblk(s, block) __getblk(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize)
1628#define journal_bread(s, block) __bread(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize)
1629
1630enum reiserfs_bh_state_bits {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001631 BH_JDirty = BH_PrivateStart, /* buffer is in current transaction */
1632 BH_JDirty_wait,
1633 BH_JNew, /* disk block was taken off free list before
1634 * being in a finished transaction, or
1635 * written to disk. Can be reused immed. */
1636 BH_JPrepared,
1637 BH_JRestore_dirty,
1638 BH_JTest, // debugging only will go away
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639};
1640
1641BUFFER_FNS(JDirty, journaled);
1642TAS_BUFFER_FNS(JDirty, journaled);
1643BUFFER_FNS(JDirty_wait, journal_dirty);
1644TAS_BUFFER_FNS(JDirty_wait, journal_dirty);
1645BUFFER_FNS(JNew, journal_new);
1646TAS_BUFFER_FNS(JNew, journal_new);
1647BUFFER_FNS(JPrepared, journal_prepared);
1648TAS_BUFFER_FNS(JPrepared, journal_prepared);
1649BUFFER_FNS(JRestore_dirty, journal_restore_dirty);
1650TAS_BUFFER_FNS(JRestore_dirty, journal_restore_dirty);
1651BUFFER_FNS(JTest, journal_test);
1652TAS_BUFFER_FNS(JTest, journal_test);
1653
1654/*
1655** transaction handle which is passed around for all journal calls
1656*/
1657struct reiserfs_transaction_handle {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001658 struct super_block *t_super; /* super for this FS when journal_begin was
1659 called. saves calls to reiserfs_get_super
1660 also used by nested transactions to make
1661 sure they are nesting on the right FS
1662 _must_ be first in the handle
1663 */
1664 int t_refcount;
1665 int t_blocks_logged; /* number of blocks this writer has logged */
1666 int t_blocks_allocated; /* number of blocks this writer allocated */
1667 unsigned long t_trans_id; /* sanity check, equals the current trans id */
1668 void *t_handle_save; /* save existing current->journal_info */
1669 unsigned displace_new_blocks:1; /* if new block allocation occurres, that block
1670 should be displaced from others */
1671 struct list_head t_list;
1672};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673
1674/* used to keep track of ordered and tail writes, attached to the buffer
1675 * head through b_journal_head.
1676 */
1677struct reiserfs_jh {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001678 struct reiserfs_journal_list *jl;
1679 struct buffer_head *bh;
1680 struct list_head list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681};
1682
1683void reiserfs_free_jh(struct buffer_head *bh);
1684int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh);
1685int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001686int journal_mark_dirty(struct reiserfs_transaction_handle *,
1687 struct super_block *, struct buffer_head *bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001689static inline int reiserfs_file_data_log(struct inode *inode)
1690{
1691 if (reiserfs_data_log(inode->i_sb) ||
1692 (REISERFS_I(inode)->i_flags & i_data_log))
1693 return 1;
1694 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001695}
1696
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001697static inline int reiserfs_transaction_running(struct super_block *s)
1698{
1699 struct reiserfs_transaction_handle *th = current->journal_info;
1700 if (th && th->t_super == s)
1701 return 1;
1702 if (th && th->t_super == NULL)
1703 BUG();
1704 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705}
1706
Alexander Zarochentzev23f9e0f2006-03-25 03:06:57 -08001707static inline int reiserfs_transaction_free_space(struct reiserfs_transaction_handle *th)
1708{
1709 return th->t_blocks_allocated - th->t_blocks_logged;
1710}
1711
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712int reiserfs_async_progress_wait(struct super_block *s);
1713
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001714struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
1715 super_block
1716 *,
1717 int count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001718int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *);
1719int reiserfs_commit_page(struct inode *inode, struct page *page,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001720 unsigned from, unsigned to);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721int reiserfs_flush_old_commits(struct super_block *);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001722int reiserfs_commit_for_inode(struct inode *);
1723int reiserfs_inode_needs_commit(struct inode *);
1724void reiserfs_update_inode_transaction(struct inode *);
1725void reiserfs_wait_on_write_block(struct super_block *s);
1726void reiserfs_block_writes(struct reiserfs_transaction_handle *th);
1727void reiserfs_allow_writes(struct super_block *s);
1728void reiserfs_check_lock_depth(struct super_block *s, char *caller);
1729int reiserfs_prepare_for_journal(struct super_block *, struct buffer_head *bh,
1730 int wait);
1731void reiserfs_restore_prepared_buffer(struct super_block *,
1732 struct buffer_head *bh);
1733int journal_init(struct super_block *, const char *j_dev_name, int old_format,
1734 unsigned int);
1735int journal_release(struct reiserfs_transaction_handle *, struct super_block *);
1736int journal_release_error(struct reiserfs_transaction_handle *,
1737 struct super_block *);
1738int journal_end(struct reiserfs_transaction_handle *, struct super_block *,
1739 unsigned long);
1740int journal_end_sync(struct reiserfs_transaction_handle *, struct super_block *,
1741 unsigned long);
1742int journal_mark_freed(struct reiserfs_transaction_handle *,
1743 struct super_block *, b_blocknr_t blocknr);
1744int journal_transaction_should_end(struct reiserfs_transaction_handle *, int);
1745int reiserfs_in_journal(struct super_block *p_s_sb, int bmap_nr, int bit_nr,
1746 int searchall, b_blocknr_t * next);
1747int journal_begin(struct reiserfs_transaction_handle *,
1748 struct super_block *p_s_sb, unsigned long);
1749int journal_join_abort(struct reiserfs_transaction_handle *,
1750 struct super_block *p_s_sb, unsigned long);
1751void reiserfs_journal_abort(struct super_block *sb, int errno);
1752void reiserfs_abort(struct super_block *sb, int errno, const char *fmt, ...);
1753int reiserfs_allocate_list_bitmaps(struct super_block *s,
1754 struct reiserfs_list_bitmap *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001755
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001756void add_save_link(struct reiserfs_transaction_handle *th,
1757 struct inode *inode, int truncate);
1758int remove_save_link(struct inode *inode, int truncate);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001759
1760/* objectid.c */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001761__u32 reiserfs_get_unused_objectid(struct reiserfs_transaction_handle *th);
1762void reiserfs_release_objectid(struct reiserfs_transaction_handle *th,
1763 __u32 objectid_to_release);
1764int reiserfs_convert_objectid_map_v1(struct super_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001765
1766/* stree.c */
1767int B_IS_IN_TREE(const struct buffer_head *);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001768extern void copy_item_head(struct item_head *p_v_to,
1769 const struct item_head *p_v_from);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770
1771// first key is in cpu form, second - le
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001772extern int comp_short_keys(const struct reiserfs_key *le_key,
1773 const struct cpu_key *cpu_key);
1774extern void le_key2cpu_key(struct cpu_key *to, const struct reiserfs_key *from);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001775
1776// both are in le form
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001777extern int comp_le_keys(const struct reiserfs_key *,
1778 const struct reiserfs_key *);
1779extern int comp_short_le_keys(const struct reiserfs_key *,
1780 const struct reiserfs_key *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781
1782//
1783// get key version from on disk key - kludge
1784//
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001785static inline int le_key_version(const struct reiserfs_key *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001786{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001787 int type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001789 type = offset_v2_k_type(&(key->u.k_offset_v2));
1790 if (type != TYPE_DIRECT && type != TYPE_INDIRECT
1791 && type != TYPE_DIRENTRY)
1792 return KEY_FORMAT_3_5;
1793
1794 return KEY_FORMAT_3_6;
1795
Linus Torvalds1da177e2005-04-16 15:20:36 -07001796}
1797
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001798static inline void copy_key(struct reiserfs_key *to,
1799 const struct reiserfs_key *from)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001801 memcpy(to, from, KEY_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802}
1803
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001804int comp_items(const struct item_head *stored_ih, const struct path *p_s_path);
1805const struct reiserfs_key *get_rkey(const struct path *p_s_chk_path,
1806 const struct super_block *p_s_sb);
1807int search_by_key(struct super_block *, const struct cpu_key *,
1808 struct path *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809#define search_item(s,key,path) search_by_key (s, key, path, DISK_LEAF_NODE_LEVEL)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001810int search_for_position_by_key(struct super_block *p_s_sb,
1811 const struct cpu_key *p_s_cpu_key,
1812 struct path *p_s_search_path);
1813extern void decrement_bcount(struct buffer_head *p_s_bh);
1814void decrement_counters_in_path(struct path *p_s_search_path);
1815void pathrelse(struct path *p_s_search_path);
1816int reiserfs_check_path(struct path *p);
1817void pathrelse_and_restore(struct super_block *s, struct path *p_s_search_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001819int reiserfs_insert_item(struct reiserfs_transaction_handle *th,
1820 struct path *path,
1821 const struct cpu_key *key,
1822 struct item_head *ih,
1823 struct inode *inode, const char *body);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001825int reiserfs_paste_into_item(struct reiserfs_transaction_handle *th,
1826 struct path *path,
1827 const struct cpu_key *key,
1828 struct inode *inode,
1829 const char *body, int paste_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001830
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001831int reiserfs_cut_from_item(struct reiserfs_transaction_handle *th,
1832 struct path *path,
1833 struct cpu_key *key,
1834 struct inode *inode,
1835 struct page *page, loff_t new_file_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001837int reiserfs_delete_item(struct reiserfs_transaction_handle *th,
1838 struct path *path,
1839 const struct cpu_key *key,
1840 struct inode *inode, struct buffer_head *p_s_un_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001842void reiserfs_delete_solid_item(struct reiserfs_transaction_handle *th,
1843 struct inode *inode, struct reiserfs_key *key);
1844int reiserfs_delete_object(struct reiserfs_transaction_handle *th,
1845 struct inode *p_s_inode);
1846int reiserfs_do_truncate(struct reiserfs_transaction_handle *th,
1847 struct inode *p_s_inode, struct page *,
1848 int update_timestamps);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001849
1850#define i_block_size(inode) ((inode)->i_sb->s_blocksize)
1851#define file_size(inode) ((inode)->i_size)
1852#define tail_size(inode) (file_size (inode) & (i_block_size (inode) - 1))
1853
1854#define tail_has_to_be_packed(inode) (have_large_tails ((inode)->i_sb)?\
1855!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 )
1856
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001857void padd_item(char *item, int total_length, int length);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001858
1859/* inode.c */
1860/* args for the create parameter of reiserfs_get_block */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001861#define GET_BLOCK_NO_CREATE 0 /* don't create new blocks or convert tails */
1862#define GET_BLOCK_CREATE 1 /* add anything you need to find block */
1863#define GET_BLOCK_NO_HOLE 2 /* return -ENOENT for file holes */
1864#define GET_BLOCK_READ_DIRECT 4 /* read the tail if indirect item not found */
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001865#define GET_BLOCK_NO_IMUX 8 /* i_mutex is not held, don't preallocate */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001866#define GET_BLOCK_NO_DANGLE 16 /* don't leave any transactions running */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001867
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001868int restart_transaction(struct reiserfs_transaction_handle *th,
1869 struct inode *inode, struct path *path);
1870void reiserfs_read_locked_inode(struct inode *inode,
1871 struct reiserfs_iget_args *args);
1872int reiserfs_find_actor(struct inode *inode, void *p);
1873int reiserfs_init_locked_inode(struct inode *inode, void *p);
1874void reiserfs_delete_inode(struct inode *inode);
1875int reiserfs_write_inode(struct inode *inode, int);
1876int reiserfs_get_block(struct inode *inode, sector_t block,
1877 struct buffer_head *bh_result, int create);
1878struct dentry *reiserfs_get_dentry(struct super_block *, void *);
1879struct dentry *reiserfs_decode_fh(struct super_block *sb, __u32 * data,
1880 int len, int fhtype,
1881 int (*acceptable) (void *contect,
1882 struct dentry * de),
1883 void *context);
1884int reiserfs_encode_fh(struct dentry *dentry, __u32 * data, int *lenp,
1885 int connectable);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001886
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001887int reiserfs_truncate_file(struct inode *, int update_timestamps);
1888void make_cpu_key(struct cpu_key *cpu_key, struct inode *inode, loff_t offset,
1889 int type, int key_length);
1890void make_le_item_head(struct item_head *ih, const struct cpu_key *key,
1891 int version,
1892 loff_t offset, int type, int length, int entry_count);
1893struct inode *reiserfs_iget(struct super_block *s, const struct cpu_key *key);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001895int reiserfs_new_inode(struct reiserfs_transaction_handle *th,
1896 struct inode *dir, int mode,
1897 const char *symname, loff_t i_size,
1898 struct dentry *dentry, struct inode *inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001899
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001900void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th,
1901 struct inode *inode, loff_t size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902
1903static inline void reiserfs_update_sd(struct reiserfs_transaction_handle *th,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001904 struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001906 reiserfs_update_sd_size(th, inode, inode->i_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001907}
1908
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001909void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode);
1910void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911int reiserfs_setattr(struct dentry *dentry, struct iattr *attr);
1912
1913/* namei.c */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001914void set_de_name_and_namelen(struct reiserfs_dir_entry *de);
1915int search_by_entry_key(struct super_block *sb, const struct cpu_key *key,
1916 struct path *path, struct reiserfs_dir_entry *de);
1917struct dentry *reiserfs_get_parent(struct dentry *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918/* procfs.c */
1919
1920#if defined( CONFIG_PROC_FS ) && defined( CONFIG_REISERFS_PROC_INFO )
1921#define REISERFS_PROC_INFO
1922#else
1923#undef REISERFS_PROC_INFO
1924#endif
1925
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001926int reiserfs_proc_info_init(struct super_block *sb);
1927int reiserfs_proc_info_done(struct super_block *sb);
1928struct proc_dir_entry *reiserfs_proc_register_global(char *name,
1929 read_proc_t * func);
1930void reiserfs_proc_unregister_global(const char *name);
1931int reiserfs_proc_info_global_init(void);
1932int reiserfs_proc_info_global_done(void);
1933int reiserfs_global_version_in_proc(char *buffer, char **start, off_t offset,
1934 int count, int *eof, void *data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935
1936#if defined( REISERFS_PROC_INFO )
1937
1938#define PROC_EXP( e ) e
1939
1940#define __PINFO( sb ) REISERFS_SB(sb) -> s_proc_info_data
1941#define PROC_INFO_MAX( sb, field, value ) \
1942 __PINFO( sb ).field = \
1943 max( REISERFS_SB( sb ) -> s_proc_info_data.field, value )
1944#define PROC_INFO_INC( sb, field ) ( ++ ( __PINFO( sb ).field ) )
1945#define PROC_INFO_ADD( sb, field, val ) ( __PINFO( sb ).field += ( val ) )
1946#define PROC_INFO_BH_STAT( sb, bh, level ) \
1947 PROC_INFO_INC( sb, sbk_read_at[ ( level ) ] ); \
1948 PROC_INFO_ADD( sb, free_at[ ( level ) ], B_FREE_SPACE( bh ) ); \
1949 PROC_INFO_ADD( sb, items_at[ ( level ) ], B_NR_ITEMS( bh ) )
1950#else
1951#define PROC_EXP( e )
1952#define VOID_V ( ( void ) 0 )
1953#define PROC_INFO_MAX( sb, field, value ) VOID_V
1954#define PROC_INFO_INC( sb, field ) VOID_V
1955#define PROC_INFO_ADD( sb, field, val ) VOID_V
1956#define PROC_INFO_BH_STAT( p_s_sb, p_s_bh, n_node_level ) VOID_V
1957#endif
1958
1959/* dir.c */
1960extern struct inode_operations reiserfs_dir_inode_operations;
1961extern struct inode_operations reiserfs_symlink_inode_operations;
1962extern struct inode_operations reiserfs_special_inode_operations;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001963extern const struct file_operations reiserfs_dir_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001964
1965/* tail_conversion.c */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001966int direct2indirect(struct reiserfs_transaction_handle *, struct inode *,
1967 struct path *, struct buffer_head *, loff_t);
1968int indirect2direct(struct reiserfs_transaction_handle *, struct inode *,
1969 struct page *, struct path *, const struct cpu_key *,
1970 loff_t, char *);
1971void reiserfs_unmap_buffer(struct buffer_head *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972
1973/* file.c */
1974extern struct inode_operations reiserfs_file_inode_operations;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001975extern const struct file_operations reiserfs_file_operations;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001976extern struct address_space_operations reiserfs_address_space_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001977
1978/* fix_nodes.c */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001980int fix_nodes(int n_op_mode, struct tree_balance *p_s_tb,
1981 struct item_head *p_s_ins_ih, const void *);
1982void unfix_nodes(struct tree_balance *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001983
1984/* prints.c */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001985void reiserfs_panic(struct super_block *s, const char *fmt, ...)
1986 __attribute__ ((noreturn));
1987void reiserfs_info(struct super_block *s, const char *fmt, ...);
1988void reiserfs_debug(struct super_block *s, int level, const char *fmt, ...);
1989void print_indirect_item(struct buffer_head *bh, int item_num);
1990void store_print_tb(struct tree_balance *tb);
1991void print_cur_tb(char *mes);
1992void print_de(struct reiserfs_dir_entry *de);
1993void print_bi(struct buffer_info *bi, char *mes);
1994#define PRINT_LEAF_ITEMS 1 /* print all items */
1995#define PRINT_DIRECTORY_ITEMS 2 /* print directory items */
1996#define PRINT_DIRECT_ITEMS 4 /* print contents of direct items */
1997void print_block(struct buffer_head *bh, ...);
1998void print_bmap(struct super_block *s, int silent);
1999void print_bmap_block(int i, char *data, int size, int silent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000/*void print_super_block (struct super_block * s, char * mes);*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002001void print_objectid_map(struct super_block *s);
2002void print_block_head(struct buffer_head *bh, char *mes);
2003void check_leaf(struct buffer_head *bh);
2004void check_internal(struct buffer_head *bh);
2005void print_statistics(struct super_block *s);
2006char *reiserfs_hashname(int code);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002007
2008/* lbalance.c */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002009int leaf_move_items(int shift_mode, struct tree_balance *tb, int mov_num,
2010 int mov_bytes, struct buffer_head *Snew);
2011int leaf_shift_left(struct tree_balance *tb, int shift_num, int shift_bytes);
2012int leaf_shift_right(struct tree_balance *tb, int shift_num, int shift_bytes);
2013void leaf_delete_items(struct buffer_info *cur_bi, int last_first, int first,
2014 int del_num, int del_bytes);
2015void leaf_insert_into_buf(struct buffer_info *bi, int before,
2016 struct item_head *inserted_item_ih,
2017 const char *inserted_item_body, int zeros_number);
2018void leaf_paste_in_buffer(struct buffer_info *bi, int pasted_item_num,
2019 int pos_in_item, int paste_size, const char *body,
2020 int zeros_number);
2021void leaf_cut_from_buffer(struct buffer_info *bi, int cut_item_num,
2022 int pos_in_item, int cut_size);
2023void leaf_paste_entries(struct buffer_head *bh, int item_num, int before,
2024 int new_entry_count, struct reiserfs_de_head *new_dehs,
2025 const char *records, int paste_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026/* ibalance.c */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002027int balance_internal(struct tree_balance *, int, int, struct item_head *,
2028 struct buffer_head **);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002029
2030/* do_balance.c */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002031void do_balance_mark_leaf_dirty(struct tree_balance *tb,
2032 struct buffer_head *bh, int flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002033#define do_balance_mark_internal_dirty do_balance_mark_leaf_dirty
2034#define do_balance_mark_sb_dirty do_balance_mark_leaf_dirty
2035
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002036void do_balance(struct tree_balance *tb, struct item_head *ih,
2037 const char *body, int flag);
2038void reiserfs_invalidate_buffer(struct tree_balance *tb,
2039 struct buffer_head *bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002040
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002041int get_left_neighbor_position(struct tree_balance *tb, int h);
2042int get_right_neighbor_position(struct tree_balance *tb, int h);
2043void replace_key(struct tree_balance *tb, struct buffer_head *, int,
2044 struct buffer_head *, int);
2045void make_empty_node(struct buffer_info *);
2046struct buffer_head *get_FEB(struct tree_balance *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002047
2048/* bitmap.c */
2049
2050/* structure contains hints for block allocator, and it is a container for
2051 * arguments, such as node, search path, transaction_handle, etc. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002052struct __reiserfs_blocknr_hint {
2053 struct inode *inode; /* inode passed to allocator, if we allocate unf. nodes */
2054 long block; /* file offset, in blocks */
2055 struct in_core_key key;
2056 struct path *path; /* search path, used by allocator to deternine search_start by
2057 * various ways */
2058 struct reiserfs_transaction_handle *th; /* transaction handle is needed to log super blocks and
2059 * bitmap blocks changes */
2060 b_blocknr_t beg, end;
2061 b_blocknr_t search_start; /* a field used to transfer search start value (block number)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062 * between different block allocator procedures
2063 * (determine_search_start() and others) */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002064 int prealloc_size; /* is set in determine_prealloc_size() function, used by underlayed
2065 * function that do actual allocation */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002067 unsigned formatted_node:1; /* the allocator uses different polices for getting disk space for
Linus Torvalds1da177e2005-04-16 15:20:36 -07002068 * formatted/unformatted blocks with/without preallocation */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002069 unsigned preallocate:1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070};
2071
2072typedef struct __reiserfs_blocknr_hint reiserfs_blocknr_hint_t;
2073
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002074int reiserfs_parse_alloc_options(struct super_block *, char *);
2075void reiserfs_init_alloc_options(struct super_block *s);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002076
2077/*
2078 * given a directory, this will tell you what packing locality
2079 * to use for a new object underneat it. The locality is returned
2080 * in disk byte order (le).
2081 */
Al Viro3e8962b2005-05-01 08:59:18 -07002082__le32 reiserfs_choose_packing(struct inode *dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002083
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002084int is_reusable(struct super_block *s, b_blocknr_t block, int bit_value);
2085void reiserfs_free_block(struct reiserfs_transaction_handle *th, struct inode *,
2086 b_blocknr_t, int for_unformatted);
2087int reiserfs_allocate_blocknrs(reiserfs_blocknr_hint_t *, b_blocknr_t *, int,
2088 int);
Adrian Bunk9adeb1b2005-09-10 00:27:18 -07002089static inline int reiserfs_new_form_blocknrs(struct tree_balance *tb,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002090 b_blocknr_t * new_blocknrs,
2091 int amount_needed)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002092{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002093 reiserfs_blocknr_hint_t hint = {
2094 .th = tb->transaction_handle,
2095 .path = tb->tb_path,
2096 .inode = NULL,
2097 .key = tb->key,
2098 .block = 0,
2099 .formatted_node = 1
2100 };
2101 return reiserfs_allocate_blocknrs(&hint, new_blocknrs, amount_needed,
2102 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002103}
2104
Adrian Bunk9adeb1b2005-09-10 00:27:18 -07002105static inline int reiserfs_new_unf_blocknrs(struct reiserfs_transaction_handle
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002106 *th, struct inode *inode,
2107 b_blocknr_t * new_blocknrs,
2108 struct path *path, long block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002109{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002110 reiserfs_blocknr_hint_t hint = {
2111 .th = th,
2112 .path = path,
2113 .inode = inode,
2114 .block = block,
2115 .formatted_node = 0,
2116 .preallocate = 0
2117 };
2118 return reiserfs_allocate_blocknrs(&hint, new_blocknrs, 1, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002119}
2120
2121#ifdef REISERFS_PREALLOCATE
Adrian Bunk9adeb1b2005-09-10 00:27:18 -07002122static inline int reiserfs_new_unf_blocknrs2(struct reiserfs_transaction_handle
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002123 *th, struct inode *inode,
2124 b_blocknr_t * new_blocknrs,
2125 struct path *path, long block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002126{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002127 reiserfs_blocknr_hint_t hint = {
2128 .th = th,
2129 .path = path,
2130 .inode = inode,
2131 .block = block,
2132 .formatted_node = 0,
2133 .preallocate = 1
2134 };
2135 return reiserfs_allocate_blocknrs(&hint, new_blocknrs, 1, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002136}
2137
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002138void reiserfs_discard_prealloc(struct reiserfs_transaction_handle *th,
2139 struct inode *inode);
2140void reiserfs_discard_all_prealloc(struct reiserfs_transaction_handle *th);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002141#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002142void reiserfs_claim_blocks_to_be_allocated(struct super_block *sb, int blocks);
2143void reiserfs_release_claimed_blocks(struct super_block *sb, int blocks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002144int reiserfs_can_fit_pages(struct super_block *sb);
2145
2146/* hashes.c */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002147__u32 keyed_hash(const signed char *msg, int len);
2148__u32 yura_hash(const signed char *msg, int len);
2149__u32 r5_hash(const signed char *msg, int len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002150
2151/* the ext2 bit routines adjust for big or little endian as
2152** appropriate for the arch, so in our laziness we use them rather
2153** than using the bit routines they call more directly. These
2154** routines must be used when changing on disk bitmaps. */
2155#define reiserfs_test_and_set_le_bit ext2_set_bit
2156#define reiserfs_test_and_clear_le_bit ext2_clear_bit
2157#define reiserfs_test_le_bit ext2_test_bit
2158#define reiserfs_find_next_zero_le_bit ext2_find_next_zero_bit
2159
2160/* sometimes reiserfs_truncate may require to allocate few new blocks
2161 to perform indirect2direct conversion. People probably used to
2162 think, that truncate should work without problems on a filesystem
2163 without free disk space. They may complain that they can not
2164 truncate due to lack of free disk space. This spare space allows us
2165 to not worry about it. 500 is probably too much, but it should be
2166 absolutely safe */
2167#define SPARE_SPACE 500
2168
Linus Torvalds1da177e2005-04-16 15:20:36 -07002169/* prototypes from ioctl.c */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002170int reiserfs_ioctl(struct inode *inode, struct file *filp,
2171 unsigned int cmd, unsigned long arg);
2172
Linus Torvalds1da177e2005-04-16 15:20:36 -07002173/* ioctl's command */
2174#define REISERFS_IOC_UNPACK _IOW(0xCD,1,long)
2175/* define following flags to be the same as in ext2, so that chattr(1),
2176 lsattr(1) will work with us. */
2177#define REISERFS_IOC_GETFLAGS EXT2_IOC_GETFLAGS
2178#define REISERFS_IOC_SETFLAGS EXT2_IOC_SETFLAGS
2179#define REISERFS_IOC_GETVERSION EXT2_IOC_GETVERSION
2180#define REISERFS_IOC_SETVERSION EXT2_IOC_SETVERSION
2181
2182/* Locking primitives */
2183/* Right now we are still falling back to (un)lock_kernel, but eventually that
2184 would evolve into real per-fs locks */
2185#define reiserfs_write_lock( sb ) lock_kernel()
2186#define reiserfs_write_unlock( sb ) unlock_kernel()
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002187
Linus Torvalds1da177e2005-04-16 15:20:36 -07002188/* xattr stuff */
2189#define REISERFS_XATTR_DIR_SEM(s) (REISERFS_SB(s)->xattr_dir_sem)
2190
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002191#endif /* _LINUX_REISER_FS_H */