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1da177e4 LT |
1 | /* |
2 | * Copyright 1996, 1997, 1998 Hans Reiser, see reiserfs/README for licensing and copyright details | |
3 | */ | |
4 | ||
5 | /* this file has an amazingly stupid | |
6 | 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. */ | |
10 | ||
11 | ||
12 | #ifndef _LINUX_REISER_FS_H | |
13 | #define _LINUX_REISER_FS_H | |
14 | ||
15 | #include <linux/types.h> | |
16 | #ifdef __KERNEL__ | |
17 | #include <linux/slab.h> | |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/workqueue.h> | |
21 | #include <asm/unaligned.h> | |
22 | #include <linux/bitops.h> | |
23 | #include <linux/proc_fs.h> | |
24 | #include <linux/smp_lock.h> | |
25 | #include <linux/buffer_head.h> | |
26 | #include <linux/reiserfs_fs_i.h> | |
27 | #include <linux/reiserfs_fs_sb.h> | |
28 | #endif | |
29 | ||
30 | /* | |
31 | * include/linux/reiser_fs.h | |
32 | * | |
33 | * Reiser File System constants and structures | |
34 | * | |
35 | */ | |
36 | ||
37 | /* in reading the #defines, it may help to understand that they employ | |
38 | the following abbreviations: | |
39 | ||
40 | B = Buffer | |
41 | I = Item header | |
42 | H = Height within the tree (should be changed to LEV) | |
43 | N = Number of the item in the node | |
44 | STAT = stat data | |
45 | DEH = Directory Entry Header | |
46 | EC = Entry Count | |
47 | E = Entry number | |
48 | UL = Unsigned Long | |
49 | BLKH = BLocK Header | |
50 | UNFM = UNForMatted node | |
51 | DC = Disk Child | |
52 | P = Path | |
53 | ||
54 | These #defines are named by concatenating these abbreviations, | |
55 | where first comes the arguments, and last comes the return value, | |
56 | of the macro. | |
57 | ||
58 | */ | |
59 | ||
60 | #define USE_INODE_GENERATION_COUNTER | |
61 | ||
62 | #define REISERFS_PREALLOCATE | |
63 | #define DISPLACE_NEW_PACKING_LOCALITIES | |
64 | #define PREALLOCATION_SIZE 9 | |
65 | ||
66 | /* n must be power of 2 */ | |
67 | #define _ROUND_UP(x,n) (((x)+(n)-1u) & ~((n)-1u)) | |
68 | ||
69 | // to be ok for alpha and others we have to align structures to 8 byte | |
70 | // boundary. | |
71 | // FIXME: do not change 4 by anything else: there is code which relies on that | |
72 | #define ROUND_UP(x) _ROUND_UP(x,8LL) | |
73 | ||
74 | /* debug levels. Right now, CONFIG_REISERFS_CHECK means print all debug | |
75 | ** messages. | |
76 | */ | |
77 | #define REISERFS_DEBUG_CODE 5 /* extra messages to help find/debug errors */ | |
78 | ||
79 | void reiserfs_warning (struct super_block *s, const char * fmt, ...); | |
80 | /* assertions handling */ | |
81 | ||
82 | /** always check a condition and panic if it's false. */ | |
83 | #define RASSERT( cond, format, args... ) \ | |
84 | if( !( cond ) ) \ | |
85 | reiserfs_panic( NULL, "reiserfs[%i]: assertion " #cond " failed at " \ | |
86 | __FILE__ ":%i:%s: " format "\n", \ | |
87 | in_interrupt() ? -1 : current -> pid, __LINE__ , __FUNCTION__ , ##args ) | |
88 | ||
89 | #if defined( CONFIG_REISERFS_CHECK ) | |
90 | #define RFALSE( cond, format, args... ) RASSERT( !( cond ), format, ##args ) | |
91 | #else | |
92 | #define RFALSE( cond, format, args... ) do {;} while( 0 ) | |
93 | #endif | |
94 | ||
95 | #define CONSTF __attribute_const__ | |
96 | /* | |
97 | * Disk Data Structures | |
98 | */ | |
99 | ||
100 | /***************************************************************************/ | |
101 | /* SUPER BLOCK */ | |
102 | /***************************************************************************/ | |
103 | ||
104 | /* | |
105 | * Structure of super block on disk, a version of which in RAM is often accessed as REISERFS_SB(s)->s_rs | |
106 | * the version in RAM is part of a larger structure containing fields never written to disk. | |
107 | */ | |
108 | #define UNSET_HASH 0 // read_super will guess about, what hash names | |
109 | // in directories were sorted with | |
110 | #define TEA_HASH 1 | |
111 | #define YURA_HASH 2 | |
112 | #define R5_HASH 3 | |
113 | #define DEFAULT_HASH R5_HASH | |
114 | ||
115 | ||
116 | struct journal_params { | |
3e8962be | 117 | __le32 jp_journal_1st_block; /* where does journal start from on its |
1da177e4 | 118 | * device */ |
3e8962be AV |
119 | __le32 jp_journal_dev; /* journal device st_rdev */ |
120 | __le32 jp_journal_size; /* size of the journal */ | |
121 | __le32 jp_journal_trans_max; /* max number of blocks in a transaction. */ | |
122 | __le32 jp_journal_magic; /* random value made on fs creation (this | |
1da177e4 | 123 | * was sb_journal_block_count) */ |
3e8962be | 124 | __le32 jp_journal_max_batch; /* max number of blocks to batch into a |
1da177e4 | 125 | * trans */ |
3e8962be | 126 | __le32 jp_journal_max_commit_age; /* in seconds, how old can an async |
1da177e4 | 127 | * commit be */ |
3e8962be | 128 | __le32 jp_journal_max_trans_age; /* in seconds, how old can a transaction |
1da177e4 LT |
129 | * be */ |
130 | }; | |
131 | ||
132 | /* this is the super from 3.5.X, where X >= 10 */ | |
133 | struct reiserfs_super_block_v1 | |
134 | { | |
3e8962be AV |
135 | __le32 s_block_count; /* blocks count */ |
136 | __le32 s_free_blocks; /* free blocks count */ | |
137 | __le32 s_root_block; /* root block number */ | |
1da177e4 | 138 | struct journal_params s_journal; |
3e8962be AV |
139 | __le16 s_blocksize; /* block size */ |
140 | __le16 s_oid_maxsize; /* max size of object id array, see | |
1da177e4 | 141 | * get_objectid() commentary */ |
3e8962be AV |
142 | __le16 s_oid_cursize; /* current size of object id array */ |
143 | __le16 s_umount_state; /* this is set to 1 when filesystem was | |
1da177e4 LT |
144 | * umounted, to 2 - when not */ |
145 | char s_magic[10]; /* reiserfs magic string indicates that | |
146 | * file system is reiserfs: | |
147 | * "ReIsErFs" or "ReIsEr2Fs" or "ReIsEr3Fs" */ | |
3e8962be | 148 | __le16 s_fs_state; /* it is set to used by fsck to mark which |
1da177e4 | 149 | * phase of rebuilding is done */ |
3e8962be | 150 | __le32 s_hash_function_code; /* indicate, what hash function is being use |
1da177e4 | 151 | * to sort names in a directory*/ |
3e8962be AV |
152 | __le16 s_tree_height; /* height of disk tree */ |
153 | __le16 s_bmap_nr; /* amount of bitmap blocks needed to address | |
1da177e4 | 154 | * each block of file system */ |
3e8962be | 155 | __le16 s_version; /* this field is only reliable on filesystem |
1da177e4 | 156 | * with non-standard journal */ |
3e8962be | 157 | __le16 s_reserved_for_journal; /* size in blocks of journal area on main |
1da177e4 LT |
158 | * device, we need to keep after |
159 | * making fs with non-standard journal */ | |
160 | } __attribute__ ((__packed__)); | |
161 | ||
162 | #define SB_SIZE_V1 (sizeof(struct reiserfs_super_block_v1)) | |
163 | ||
164 | /* this is the on disk super block */ | |
165 | struct reiserfs_super_block | |
166 | { | |
167 | struct reiserfs_super_block_v1 s_v1; | |
3e8962be AV |
168 | __le32 s_inode_generation; |
169 | __le32 s_flags; /* Right now used only by inode-attributes, if enabled */ | |
1da177e4 LT |
170 | unsigned char s_uuid[16]; /* filesystem unique identifier */ |
171 | unsigned char s_label[16]; /* filesystem volume label */ | |
172 | char s_unused[88] ; /* zero filled by mkreiserfs and | |
173 | * reiserfs_convert_objectid_map_v1() | |
174 | * so any additions must be updated | |
175 | * there as well. */ | |
176 | } __attribute__ ((__packed__)); | |
177 | ||
178 | #define SB_SIZE (sizeof(struct reiserfs_super_block)) | |
179 | ||
180 | #define REISERFS_VERSION_1 0 | |
181 | #define REISERFS_VERSION_2 2 | |
182 | ||
183 | ||
184 | // on-disk super block fields converted to cpu form | |
185 | #define SB_DISK_SUPER_BLOCK(s) (REISERFS_SB(s)->s_rs) | |
186 | #define SB_V1_DISK_SUPER_BLOCK(s) (&(SB_DISK_SUPER_BLOCK(s)->s_v1)) | |
187 | #define SB_BLOCKSIZE(s) \ | |
188 | le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_blocksize)) | |
189 | #define SB_BLOCK_COUNT(s) \ | |
190 | le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_block_count)) | |
191 | #define SB_FREE_BLOCKS(s) \ | |
192 | le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_free_blocks)) | |
193 | #define SB_REISERFS_MAGIC(s) \ | |
194 | (SB_V1_DISK_SUPER_BLOCK(s)->s_magic) | |
195 | #define SB_ROOT_BLOCK(s) \ | |
196 | le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_root_block)) | |
197 | #define SB_TREE_HEIGHT(s) \ | |
198 | le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_tree_height)) | |
199 | #define SB_REISERFS_STATE(s) \ | |
200 | le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_umount_state)) | |
201 | #define SB_VERSION(s) le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_version)) | |
202 | #define SB_BMAP_NR(s) le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_bmap_nr)) | |
203 | ||
204 | #define PUT_SB_BLOCK_COUNT(s, val) \ | |
205 | do { SB_V1_DISK_SUPER_BLOCK(s)->s_block_count = cpu_to_le32(val); } while (0) | |
206 | #define PUT_SB_FREE_BLOCKS(s, val) \ | |
207 | do { SB_V1_DISK_SUPER_BLOCK(s)->s_free_blocks = cpu_to_le32(val); } while (0) | |
208 | #define PUT_SB_ROOT_BLOCK(s, val) \ | |
209 | do { SB_V1_DISK_SUPER_BLOCK(s)->s_root_block = cpu_to_le32(val); } while (0) | |
210 | #define PUT_SB_TREE_HEIGHT(s, val) \ | |
211 | do { SB_V1_DISK_SUPER_BLOCK(s)->s_tree_height = cpu_to_le16(val); } while (0) | |
212 | #define PUT_SB_REISERFS_STATE(s, val) \ | |
213 | do { SB_V1_DISK_SUPER_BLOCK(s)->s_umount_state = cpu_to_le16(val); } while (0) | |
214 | #define PUT_SB_VERSION(s, val) \ | |
215 | do { SB_V1_DISK_SUPER_BLOCK(s)->s_version = cpu_to_le16(val); } while (0) | |
216 | #define PUT_SB_BMAP_NR(s, val) \ | |
217 | do { SB_V1_DISK_SUPER_BLOCK(s)->s_bmap_nr = cpu_to_le16 (val); } while (0) | |
218 | ||
219 | ||
220 | #define SB_ONDISK_JP(s) (&SB_V1_DISK_SUPER_BLOCK(s)->s_journal) | |
221 | #define SB_ONDISK_JOURNAL_SIZE(s) \ | |
222 | le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_size)) | |
223 | #define SB_ONDISK_JOURNAL_1st_BLOCK(s) \ | |
224 | le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_1st_block)) | |
225 | #define SB_ONDISK_JOURNAL_DEVICE(s) \ | |
226 | le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_dev)) | |
227 | #define SB_ONDISK_RESERVED_FOR_JOURNAL(s) \ | |
b8cc936f | 228 | le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_reserved_for_journal)) |
1da177e4 LT |
229 | |
230 | #define is_block_in_log_or_reserved_area(s, block) \ | |
231 | block >= SB_JOURNAL_1st_RESERVED_BLOCK(s) \ | |
232 | && block < SB_JOURNAL_1st_RESERVED_BLOCK(s) + \ | |
233 | ((!is_reiserfs_jr(SB_DISK_SUPER_BLOCK(s)) ? \ | |
234 | SB_ONDISK_JOURNAL_SIZE(s) + 1 : SB_ONDISK_RESERVED_FOR_JOURNAL(s))) | |
235 | ||
236 | ||
237 | ||
238 | /* used by gcc */ | |
239 | #define REISERFS_SUPER_MAGIC 0x52654973 | |
240 | /* used by file system utilities that | |
241 | look at the superblock, etc. */ | |
242 | #define REISERFS_SUPER_MAGIC_STRING "ReIsErFs" | |
243 | #define REISER2FS_SUPER_MAGIC_STRING "ReIsEr2Fs" | |
244 | #define REISER2FS_JR_SUPER_MAGIC_STRING "ReIsEr3Fs" | |
245 | ||
246 | int is_reiserfs_3_5 (struct reiserfs_super_block * rs); | |
247 | int is_reiserfs_3_6 (struct reiserfs_super_block * rs); | |
248 | int is_reiserfs_jr (struct reiserfs_super_block * rs); | |
249 | ||
250 | /* ReiserFS leaves the first 64k unused, so that partition labels have | |
251 | enough space. If someone wants to write a fancy bootloader that | |
252 | needs more than 64k, let us know, and this will be increased in size. | |
253 | This number must be larger than than the largest block size on any | |
254 | platform, or code will break. -Hans */ | |
255 | #define REISERFS_DISK_OFFSET_IN_BYTES (64 * 1024) | |
256 | #define REISERFS_FIRST_BLOCK unused_define | |
257 | #define REISERFS_JOURNAL_OFFSET_IN_BYTES REISERFS_DISK_OFFSET_IN_BYTES | |
258 | ||
259 | /* the spot for the super in versions 3.5 - 3.5.10 (inclusive) */ | |
260 | #define REISERFS_OLD_DISK_OFFSET_IN_BYTES (8 * 1024) | |
261 | ||
262 | // reiserfs internal error code (used by search_by_key adn fix_nodes)) | |
263 | #define CARRY_ON 0 | |
264 | #define REPEAT_SEARCH -1 | |
265 | #define IO_ERROR -2 | |
266 | #define NO_DISK_SPACE -3 | |
267 | #define NO_BALANCING_NEEDED (-4) | |
268 | #define NO_MORE_UNUSED_CONTIGUOUS_BLOCKS (-5) | |
269 | #define QUOTA_EXCEEDED -6 | |
270 | ||
271 | typedef __u32 b_blocknr_t; | |
3e8962be | 272 | typedef __le32 unp_t; |
1da177e4 LT |
273 | |
274 | struct unfm_nodeinfo { | |
275 | unp_t unfm_nodenum; | |
276 | unsigned short unfm_freespace; | |
277 | }; | |
278 | ||
279 | /* there are two formats of keys: 3.5 and 3.6 | |
280 | */ | |
281 | #define KEY_FORMAT_3_5 0 | |
282 | #define KEY_FORMAT_3_6 1 | |
283 | ||
284 | /* there are two stat datas */ | |
285 | #define STAT_DATA_V1 0 | |
286 | #define STAT_DATA_V2 1 | |
287 | ||
288 | ||
289 | static inline struct reiserfs_inode_info *REISERFS_I(const struct inode *inode) | |
290 | { | |
291 | return container_of(inode, struct reiserfs_inode_info, vfs_inode); | |
292 | } | |
293 | ||
294 | static inline struct reiserfs_sb_info *REISERFS_SB(const struct super_block *sb) | |
295 | { | |
296 | return sb->s_fs_info; | |
297 | } | |
298 | ||
299 | /** this says about version of key of all items (but stat data) the | |
300 | object consists of */ | |
301 | #define get_inode_item_key_version( inode ) \ | |
302 | ((REISERFS_I(inode)->i_flags & i_item_key_version_mask) ? KEY_FORMAT_3_6 : KEY_FORMAT_3_5) | |
303 | ||
304 | #define set_inode_item_key_version( inode, version ) \ | |
305 | ({ if((version)==KEY_FORMAT_3_6) \ | |
306 | REISERFS_I(inode)->i_flags |= i_item_key_version_mask; \ | |
307 | else \ | |
308 | REISERFS_I(inode)->i_flags &= ~i_item_key_version_mask; }) | |
309 | ||
310 | #define get_inode_sd_version(inode) \ | |
311 | ((REISERFS_I(inode)->i_flags & i_stat_data_version_mask) ? STAT_DATA_V2 : STAT_DATA_V1) | |
312 | ||
313 | #define set_inode_sd_version(inode, version) \ | |
314 | ({ if((version)==STAT_DATA_V2) \ | |
315 | REISERFS_I(inode)->i_flags |= i_stat_data_version_mask; \ | |
316 | else \ | |
317 | REISERFS_I(inode)->i_flags &= ~i_stat_data_version_mask; }) | |
318 | ||
319 | /* This is an aggressive tail suppression policy, I am hoping it | |
320 | improves our benchmarks. The principle behind it is that percentage | |
321 | space saving is what matters, not absolute space saving. This is | |
322 | non-intuitive, but it helps to understand it if you consider that the | |
323 | cost to access 4 blocks is not much more than the cost to access 1 | |
324 | block, if you have to do a seek and rotate. A tail risks a | |
325 | non-linear disk access that is significant as a percentage of total | |
326 | time cost for a 4 block file and saves an amount of space that is | |
327 | less significant as a percentage of space, or so goes the hypothesis. | |
328 | -Hans */ | |
329 | #define STORE_TAIL_IN_UNFM_S1(n_file_size,n_tail_size,n_block_size) \ | |
330 | (\ | |
331 | (!(n_tail_size)) || \ | |
332 | (((n_tail_size) > MAX_DIRECT_ITEM_LEN(n_block_size)) || \ | |
333 | ( (n_file_size) >= (n_block_size) * 4 ) || \ | |
334 | ( ( (n_file_size) >= (n_block_size) * 3 ) && \ | |
335 | ( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size))/4) ) || \ | |
336 | ( ( (n_file_size) >= (n_block_size) * 2 ) && \ | |
337 | ( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size))/2) ) || \ | |
338 | ( ( (n_file_size) >= (n_block_size) ) && \ | |
339 | ( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size) * 3)/4) ) ) \ | |
340 | ) | |
341 | ||
342 | /* Another strategy for tails, this one means only create a tail if all the | |
343 | file would fit into one DIRECT item. | |
344 | Primary intention for this one is to increase performance by decreasing | |
345 | seeking. | |
346 | */ | |
347 | #define STORE_TAIL_IN_UNFM_S2(n_file_size,n_tail_size,n_block_size) \ | |
348 | (\ | |
349 | (!(n_tail_size)) || \ | |
350 | (((n_file_size) > MAX_DIRECT_ITEM_LEN(n_block_size)) ) \ | |
351 | ) | |
352 | ||
353 | ||
354 | ||
355 | /* | |
356 | * values for s_umount_state field | |
357 | */ | |
358 | #define REISERFS_VALID_FS 1 | |
359 | #define REISERFS_ERROR_FS 2 | |
360 | ||
361 | // | |
362 | // there are 5 item types currently | |
363 | // | |
364 | #define TYPE_STAT_DATA 0 | |
365 | #define TYPE_INDIRECT 1 | |
366 | #define TYPE_DIRECT 2 | |
367 | #define TYPE_DIRENTRY 3 | |
368 | #define TYPE_MAXTYPE 3 | |
369 | #define TYPE_ANY 15 // FIXME: comment is required | |
370 | ||
371 | /***************************************************************************/ | |
372 | /* KEY & ITEM HEAD */ | |
373 | /***************************************************************************/ | |
374 | ||
375 | // | |
376 | // directories use this key as well as old files | |
377 | // | |
378 | struct offset_v1 { | |
3e8962be AV |
379 | __le32 k_offset; |
380 | __le32 k_uniqueness; | |
1da177e4 LT |
381 | } __attribute__ ((__packed__)); |
382 | ||
383 | struct offset_v2 { | |
384 | #ifdef __LITTLE_ENDIAN | |
385 | /* little endian version */ | |
386 | __u64 k_offset:60; | |
387 | __u64 k_type: 4; | |
388 | #else | |
389 | /* big endian version */ | |
390 | __u64 k_type: 4; | |
391 | __u64 k_offset:60; | |
392 | #endif | |
393 | } __attribute__ ((__packed__)); | |
394 | ||
395 | #ifndef __LITTLE_ENDIAN | |
396 | typedef union { | |
397 | struct offset_v2 offset_v2; | |
398 | __u64 linear; | |
399 | } __attribute__ ((__packed__)) offset_v2_esafe_overlay; | |
400 | ||
401 | static inline __u16 offset_v2_k_type( const struct offset_v2 *v2 ) | |
402 | { | |
403 | offset_v2_esafe_overlay tmp = *(const offset_v2_esafe_overlay *)v2; | |
404 | tmp.linear = le64_to_cpu( tmp.linear ); | |
405 | return (tmp.offset_v2.k_type <= TYPE_MAXTYPE)?tmp.offset_v2.k_type:TYPE_ANY; | |
406 | } | |
407 | ||
408 | static inline void set_offset_v2_k_type( struct offset_v2 *v2, int type ) | |
409 | { | |
410 | offset_v2_esafe_overlay *tmp = (offset_v2_esafe_overlay *)v2; | |
411 | tmp->linear = le64_to_cpu(tmp->linear); | |
412 | tmp->offset_v2.k_type = type; | |
413 | tmp->linear = cpu_to_le64(tmp->linear); | |
414 | } | |
415 | ||
416 | static inline loff_t offset_v2_k_offset( const struct offset_v2 *v2 ) | |
417 | { | |
418 | offset_v2_esafe_overlay tmp = *(const offset_v2_esafe_overlay *)v2; | |
419 | tmp.linear = le64_to_cpu( tmp.linear ); | |
420 | return tmp.offset_v2.k_offset; | |
421 | } | |
422 | ||
423 | static inline void set_offset_v2_k_offset( struct offset_v2 *v2, loff_t offset ){ | |
424 | offset_v2_esafe_overlay *tmp = (offset_v2_esafe_overlay *)v2; | |
425 | tmp->linear = le64_to_cpu(tmp->linear); | |
426 | tmp->offset_v2.k_offset = offset; | |
427 | tmp->linear = cpu_to_le64(tmp->linear); | |
428 | } | |
429 | #else | |
430 | # define offset_v2_k_type(v2) ((v2)->k_type) | |
431 | # define set_offset_v2_k_type(v2,val) (offset_v2_k_type(v2) = (val)) | |
432 | # define offset_v2_k_offset(v2) ((v2)->k_offset) | |
433 | # define set_offset_v2_k_offset(v2,val) (offset_v2_k_offset(v2) = (val)) | |
434 | #endif | |
435 | ||
436 | /* Key of an item determines its location in the S+tree, and | |
437 | is composed of 4 components */ | |
438 | struct reiserfs_key { | |
3e8962be | 439 | __le32 k_dir_id; /* packing locality: by default parent |
1da177e4 | 440 | directory object id */ |
3e8962be | 441 | __le32 k_objectid; /* object identifier */ |
1da177e4 LT |
442 | union { |
443 | struct offset_v1 k_offset_v1; | |
444 | struct offset_v2 k_offset_v2; | |
445 | } __attribute__ ((__packed__)) u; | |
446 | } __attribute__ ((__packed__)); | |
447 | ||
6a3a16f2 AV |
448 | struct in_core_key { |
449 | __u32 k_dir_id; /* packing locality: by default parent | |
450 | directory object id */ | |
451 | __u32 k_objectid; /* object identifier */ | |
6b9f5829 AV |
452 | __u64 k_offset; |
453 | __u8 k_type; | |
454 | }; | |
1da177e4 LT |
455 | |
456 | struct cpu_key { | |
6a3a16f2 | 457 | struct in_core_key on_disk_key; |
1da177e4 LT |
458 | int version; |
459 | int key_length; /* 3 in all cases but direct2indirect and | |
460 | indirect2direct conversion */ | |
461 | }; | |
462 | ||
463 | /* Our function for comparing keys can compare keys of different | |
464 | lengths. It takes as a parameter the length of the keys it is to | |
465 | compare. These defines are used in determining what is to be passed | |
466 | to it as that parameter. */ | |
467 | #define REISERFS_FULL_KEY_LEN 4 | |
468 | #define REISERFS_SHORT_KEY_LEN 2 | |
469 | ||
470 | /* The result of the key compare */ | |
471 | #define FIRST_GREATER 1 | |
472 | #define SECOND_GREATER -1 | |
473 | #define KEYS_IDENTICAL 0 | |
474 | #define KEY_FOUND 1 | |
475 | #define KEY_NOT_FOUND 0 | |
476 | ||
477 | #define KEY_SIZE (sizeof(struct reiserfs_key)) | |
478 | #define SHORT_KEY_SIZE (sizeof (__u32) + sizeof (__u32)) | |
479 | ||
480 | /* return values for search_by_key and clones */ | |
481 | #define ITEM_FOUND 1 | |
482 | #define ITEM_NOT_FOUND 0 | |
483 | #define ENTRY_FOUND 1 | |
484 | #define ENTRY_NOT_FOUND 0 | |
485 | #define DIRECTORY_NOT_FOUND -1 | |
486 | #define REGULAR_FILE_FOUND -2 | |
487 | #define DIRECTORY_FOUND -3 | |
488 | #define BYTE_FOUND 1 | |
489 | #define BYTE_NOT_FOUND 0 | |
490 | #define FILE_NOT_FOUND -1 | |
491 | ||
492 | #define POSITION_FOUND 1 | |
493 | #define POSITION_NOT_FOUND 0 | |
494 | ||
495 | // return values for reiserfs_find_entry and search_by_entry_key | |
496 | #define NAME_FOUND 1 | |
497 | #define NAME_NOT_FOUND 0 | |
498 | #define GOTO_PREVIOUS_ITEM 2 | |
499 | #define NAME_FOUND_INVISIBLE 3 | |
500 | ||
501 | /* Everything in the filesystem is stored as a set of items. The | |
502 | item head contains the key of the item, its free space (for | |
503 | indirect items) and specifies the location of the item itself | |
504 | within the block. */ | |
505 | ||
506 | struct item_head | |
507 | { | |
508 | /* Everything in the tree is found by searching for it based on | |
509 | * its key.*/ | |
510 | struct reiserfs_key ih_key; | |
511 | union { | |
512 | /* The free space in the last unformatted node of an | |
513 | indirect item if this is an indirect item. This | |
514 | equals 0xFFFF iff this is a direct item or stat data | |
515 | item. Note that the key, not this field, is used to | |
516 | determine the item type, and thus which field this | |
517 | union contains. */ | |
3e8962be | 518 | __le16 ih_free_space_reserved; |
1da177e4 LT |
519 | /* Iff this is a directory item, this field equals the |
520 | number of directory entries in the directory item. */ | |
3e8962be | 521 | __le16 ih_entry_count; |
1da177e4 | 522 | } __attribute__ ((__packed__)) u; |
3e8962be AV |
523 | __le16 ih_item_len; /* total size of the item body */ |
524 | __le16 ih_item_location; /* an offset to the item body | |
1da177e4 | 525 | * within the block */ |
3e8962be | 526 | __le16 ih_version; /* 0 for all old items, 2 for new |
1da177e4 LT |
527 | ones. Highest bit is set by fsck |
528 | temporary, cleaned after all | |
529 | done */ | |
530 | } __attribute__ ((__packed__)); | |
531 | /* size of item header */ | |
532 | #define IH_SIZE (sizeof(struct item_head)) | |
533 | ||
534 | #define ih_free_space(ih) le16_to_cpu((ih)->u.ih_free_space_reserved) | |
535 | #define ih_version(ih) le16_to_cpu((ih)->ih_version) | |
536 | #define ih_entry_count(ih) le16_to_cpu((ih)->u.ih_entry_count) | |
537 | #define ih_location(ih) le16_to_cpu((ih)->ih_item_location) | |
538 | #define ih_item_len(ih) le16_to_cpu((ih)->ih_item_len) | |
539 | ||
540 | #define put_ih_free_space(ih, val) do { (ih)->u.ih_free_space_reserved = cpu_to_le16(val); } while(0) | |
541 | #define put_ih_version(ih, val) do { (ih)->ih_version = cpu_to_le16(val); } while (0) | |
542 | #define put_ih_entry_count(ih, val) do { (ih)->u.ih_entry_count = cpu_to_le16(val); } while (0) | |
543 | #define put_ih_location(ih, val) do { (ih)->ih_item_location = cpu_to_le16(val); } while (0) | |
544 | #define put_ih_item_len(ih, val) do { (ih)->ih_item_len = cpu_to_le16(val); } while (0) | |
545 | ||
546 | ||
547 | #define unreachable_item(ih) (ih_version(ih) & (1 << 15)) | |
548 | ||
549 | #define get_ih_free_space(ih) (ih_version (ih) == KEY_FORMAT_3_6 ? 0 : ih_free_space (ih)) | |
550 | #define set_ih_free_space(ih,val) put_ih_free_space((ih), ((ih_version(ih) == KEY_FORMAT_3_6) ? 0 : (val))) | |
551 | ||
552 | /* these operate on indirect items, where you've got an array of ints | |
553 | ** at a possibly unaligned location. These are a noop on ia32 | |
554 | ** | |
555 | ** p is the array of __u32, i is the index into the array, v is the value | |
556 | ** to store there. | |
557 | */ | |
558 | #define get_block_num(p, i) le32_to_cpu(get_unaligned((p) + (i))) | |
559 | #define put_block_num(p, i, v) put_unaligned(cpu_to_le32(v), (p) + (i)) | |
560 | ||
561 | // | |
562 | // in old version uniqueness field shows key type | |
563 | // | |
564 | #define V1_SD_UNIQUENESS 0 | |
565 | #define V1_INDIRECT_UNIQUENESS 0xfffffffe | |
566 | #define V1_DIRECT_UNIQUENESS 0xffffffff | |
567 | #define V1_DIRENTRY_UNIQUENESS 500 | |
568 | #define V1_ANY_UNIQUENESS 555 // FIXME: comment is required | |
569 | ||
570 | // | |
571 | // here are conversion routines | |
572 | // | |
573 | static inline int uniqueness2type (__u32 uniqueness) CONSTF; | |
574 | static inline int uniqueness2type (__u32 uniqueness) | |
575 | { | |
576 | switch ((int)uniqueness) { | |
577 | case V1_SD_UNIQUENESS: return TYPE_STAT_DATA; | |
578 | case V1_INDIRECT_UNIQUENESS: return TYPE_INDIRECT; | |
579 | case V1_DIRECT_UNIQUENESS: return TYPE_DIRECT; | |
580 | case V1_DIRENTRY_UNIQUENESS: return TYPE_DIRENTRY; | |
581 | default: | |
582 | reiserfs_warning (NULL, "vs-500: unknown uniqueness %d", | |
583 | uniqueness); | |
584 | case V1_ANY_UNIQUENESS: | |
585 | return TYPE_ANY; | |
586 | } | |
587 | } | |
588 | ||
589 | static inline __u32 type2uniqueness (int type) CONSTF; | |
590 | static inline __u32 type2uniqueness (int type) | |
591 | { | |
592 | switch (type) { | |
593 | case TYPE_STAT_DATA: return V1_SD_UNIQUENESS; | |
594 | case TYPE_INDIRECT: return V1_INDIRECT_UNIQUENESS; | |
595 | case TYPE_DIRECT: return V1_DIRECT_UNIQUENESS; | |
596 | case TYPE_DIRENTRY: return V1_DIRENTRY_UNIQUENESS; | |
597 | default: | |
598 | reiserfs_warning (NULL, "vs-501: unknown type %d", type); | |
599 | case TYPE_ANY: | |
600 | return V1_ANY_UNIQUENESS; | |
601 | } | |
602 | } | |
603 | ||
604 | // | |
605 | // key is pointer to on disk key which is stored in le, result is cpu, | |
606 | // there is no way to get version of object from key, so, provide | |
607 | // version to these defines | |
608 | // | |
609 | static inline loff_t le_key_k_offset (int version, const struct reiserfs_key * key) | |
610 | { | |
611 | return (version == KEY_FORMAT_3_5) ? | |
612 | le32_to_cpu( key->u.k_offset_v1.k_offset ) : | |
613 | offset_v2_k_offset( &(key->u.k_offset_v2) ); | |
614 | } | |
615 | ||
616 | static inline loff_t le_ih_k_offset (const struct item_head * ih) | |
617 | { | |
618 | return le_key_k_offset (ih_version (ih), &(ih->ih_key)); | |
619 | } | |
620 | ||
621 | static inline loff_t le_key_k_type (int version, const struct reiserfs_key * key) | |
622 | { | |
623 | return (version == KEY_FORMAT_3_5) ? | |
624 | uniqueness2type( le32_to_cpu( key->u.k_offset_v1.k_uniqueness)) : | |
625 | offset_v2_k_type( &(key->u.k_offset_v2) ); | |
626 | } | |
627 | ||
628 | static inline loff_t le_ih_k_type (const struct item_head * ih) | |
629 | { | |
630 | return le_key_k_type (ih_version (ih), &(ih->ih_key)); | |
631 | } | |
632 | ||
633 | ||
634 | static inline void set_le_key_k_offset (int version, struct reiserfs_key * key, loff_t offset) | |
635 | { | |
636 | (version == KEY_FORMAT_3_5) ? | |
637 | (void)(key->u.k_offset_v1.k_offset = cpu_to_le32 (offset)) : /* jdm check */ | |
638 | (void)(set_offset_v2_k_offset( &(key->u.k_offset_v2), offset )); | |
639 | } | |
640 | ||
641 | ||
642 | static inline void set_le_ih_k_offset (struct item_head * ih, loff_t offset) | |
643 | { | |
644 | set_le_key_k_offset (ih_version (ih), &(ih->ih_key), offset); | |
645 | } | |
646 | ||
647 | ||
648 | static inline void set_le_key_k_type (int version, struct reiserfs_key * key, int type) | |
649 | { | |
650 | (version == KEY_FORMAT_3_5) ? | |
651 | (void)(key->u.k_offset_v1.k_uniqueness = cpu_to_le32(type2uniqueness(type))): | |
652 | (void)(set_offset_v2_k_type( &(key->u.k_offset_v2), type )); | |
653 | } | |
654 | static inline void set_le_ih_k_type (struct item_head * ih, int type) | |
655 | { | |
656 | set_le_key_k_type (ih_version (ih), &(ih->ih_key), type); | |
657 | } | |
658 | ||
659 | ||
660 | #define is_direntry_le_key(version,key) (le_key_k_type (version, key) == TYPE_DIRENTRY) | |
661 | #define is_direct_le_key(version,key) (le_key_k_type (version, key) == TYPE_DIRECT) | |
662 | #define is_indirect_le_key(version,key) (le_key_k_type (version, key) == TYPE_INDIRECT) | |
663 | #define is_statdata_le_key(version,key) (le_key_k_type (version, key) == TYPE_STAT_DATA) | |
664 | ||
665 | // | |
666 | // item header has version. | |
667 | // | |
668 | #define is_direntry_le_ih(ih) is_direntry_le_key (ih_version (ih), &((ih)->ih_key)) | |
669 | #define is_direct_le_ih(ih) is_direct_le_key (ih_version (ih), &((ih)->ih_key)) | |
670 | #define is_indirect_le_ih(ih) is_indirect_le_key (ih_version(ih), &((ih)->ih_key)) | |
671 | #define is_statdata_le_ih(ih) is_statdata_le_key (ih_version (ih), &((ih)->ih_key)) | |
672 | ||
673 | ||
674 | ||
675 | // | |
676 | // key is pointer to cpu key, result is cpu | |
677 | // | |
678 | static inline loff_t cpu_key_k_offset (const struct cpu_key * key) | |
679 | { | |
6b9f5829 | 680 | return key->on_disk_key.k_offset; |
1da177e4 LT |
681 | } |
682 | ||
683 | static inline loff_t cpu_key_k_type (const struct cpu_key * key) | |
684 | { | |
6b9f5829 | 685 | return key->on_disk_key.k_type; |
1da177e4 LT |
686 | } |
687 | ||
688 | static inline void set_cpu_key_k_offset (struct cpu_key * key, loff_t offset) | |
689 | { | |
6b9f5829 | 690 | key->on_disk_key.k_offset = offset; |
1da177e4 LT |
691 | } |
692 | ||
1da177e4 LT |
693 | static inline void set_cpu_key_k_type (struct cpu_key * key, int type) |
694 | { | |
6b9f5829 | 695 | key->on_disk_key.k_type = type; |
1da177e4 LT |
696 | } |
697 | ||
1da177e4 LT |
698 | static inline void cpu_key_k_offset_dec (struct cpu_key * key) |
699 | { | |
6b9f5829 | 700 | key->on_disk_key.k_offset --; |
1da177e4 LT |
701 | } |
702 | ||
1da177e4 LT |
703 | #define is_direntry_cpu_key(key) (cpu_key_k_type (key) == TYPE_DIRENTRY) |
704 | #define is_direct_cpu_key(key) (cpu_key_k_type (key) == TYPE_DIRECT) | |
705 | #define is_indirect_cpu_key(key) (cpu_key_k_type (key) == TYPE_INDIRECT) | |
706 | #define is_statdata_cpu_key(key) (cpu_key_k_type (key) == TYPE_STAT_DATA) | |
707 | ||
708 | ||
709 | /* are these used ? */ | |
710 | #define is_direntry_cpu_ih(ih) (is_direntry_cpu_key (&((ih)->ih_key))) | |
711 | #define is_direct_cpu_ih(ih) (is_direct_cpu_key (&((ih)->ih_key))) | |
712 | #define is_indirect_cpu_ih(ih) (is_indirect_cpu_key (&((ih)->ih_key))) | |
713 | #define is_statdata_cpu_ih(ih) (is_statdata_cpu_key (&((ih)->ih_key))) | |
714 | ||
715 | ||
716 | ||
717 | ||
718 | ||
719 | #define I_K_KEY_IN_ITEM(p_s_ih, p_s_key, n_blocksize) \ | |
720 | ( ! COMP_SHORT_KEYS(p_s_ih, p_s_key) && \ | |
721 | I_OFF_BYTE_IN_ITEM(p_s_ih, k_offset (p_s_key), n_blocksize) ) | |
722 | ||
723 | /* maximal length of item */ | |
724 | #define MAX_ITEM_LEN(block_size) (block_size - BLKH_SIZE - IH_SIZE) | |
725 | #define MIN_ITEM_LEN 1 | |
726 | ||
727 | ||
728 | /* object identifier for root dir */ | |
729 | #define REISERFS_ROOT_OBJECTID 2 | |
730 | #define REISERFS_ROOT_PARENT_OBJECTID 1 | |
731 | extern struct reiserfs_key root_key; | |
732 | ||
733 | ||
734 | ||
735 | ||
736 | /* | |
737 | * Picture represents a leaf of the S+tree | |
738 | * ______________________________________________________ | |
739 | * | | Array of | | | | |
740 | * |Block | Object-Item | F r e e | Objects- | | |
741 | * | head | Headers | S p a c e | Items | | |
742 | * |______|_______________|___________________|___________| | |
743 | */ | |
744 | ||
745 | /* Header of a disk block. More precisely, header of a formatted leaf | |
746 | or internal node, and not the header of an unformatted node. */ | |
747 | struct block_head { | |
3e8962be AV |
748 | __le16 blk_level; /* Level of a block in the tree. */ |
749 | __le16 blk_nr_item; /* Number of keys/items in a block. */ | |
750 | __le16 blk_free_space; /* Block free space in bytes. */ | |
751 | __le16 blk_reserved; | |
1da177e4 LT |
752 | /* dump this in v4/planA */ |
753 | struct reiserfs_key blk_right_delim_key; /* kept only for compatibility */ | |
754 | }; | |
755 | ||
756 | #define BLKH_SIZE (sizeof(struct block_head)) | |
757 | #define blkh_level(p_blkh) (le16_to_cpu((p_blkh)->blk_level)) | |
758 | #define blkh_nr_item(p_blkh) (le16_to_cpu((p_blkh)->blk_nr_item)) | |
759 | #define blkh_free_space(p_blkh) (le16_to_cpu((p_blkh)->blk_free_space)) | |
760 | #define blkh_reserved(p_blkh) (le16_to_cpu((p_blkh)->blk_reserved)) | |
761 | #define set_blkh_level(p_blkh,val) ((p_blkh)->blk_level = cpu_to_le16(val)) | |
762 | #define set_blkh_nr_item(p_blkh,val) ((p_blkh)->blk_nr_item = cpu_to_le16(val)) | |
763 | #define set_blkh_free_space(p_blkh,val) ((p_blkh)->blk_free_space = cpu_to_le16(val)) | |
764 | #define set_blkh_reserved(p_blkh,val) ((p_blkh)->blk_reserved = cpu_to_le16(val)) | |
765 | #define blkh_right_delim_key(p_blkh) ((p_blkh)->blk_right_delim_key) | |
766 | #define set_blkh_right_delim_key(p_blkh,val) ((p_blkh)->blk_right_delim_key = val) | |
767 | ||
768 | /* | |
769 | * values for blk_level field of the struct block_head | |
770 | */ | |
771 | ||
772 | #define FREE_LEVEL 0 /* when node gets removed from the tree its | |
773 | blk_level is set to FREE_LEVEL. It is then | |
774 | used to see whether the node is still in the | |
775 | tree */ | |
776 | ||
777 | #define DISK_LEAF_NODE_LEVEL 1 /* Leaf node level.*/ | |
778 | ||
779 | /* Given the buffer head of a formatted node, resolve to the block head of that node. */ | |
780 | #define B_BLK_HEAD(p_s_bh) ((struct block_head *)((p_s_bh)->b_data)) | |
781 | /* Number of items that are in buffer. */ | |
782 | #define B_NR_ITEMS(p_s_bh) (blkh_nr_item(B_BLK_HEAD(p_s_bh))) | |
783 | #define B_LEVEL(p_s_bh) (blkh_level(B_BLK_HEAD(p_s_bh))) | |
784 | #define B_FREE_SPACE(p_s_bh) (blkh_free_space(B_BLK_HEAD(p_s_bh))) | |
785 | ||
786 | #define PUT_B_NR_ITEMS(p_s_bh,val) do { set_blkh_nr_item(B_BLK_HEAD(p_s_bh),val); } while (0) | |
787 | #define PUT_B_LEVEL(p_s_bh,val) do { set_blkh_level(B_BLK_HEAD(p_s_bh),val); } while (0) | |
788 | #define PUT_B_FREE_SPACE(p_s_bh,val) do { set_blkh_free_space(B_BLK_HEAD(p_s_bh),val); } while (0) | |
789 | ||
790 | ||
791 | /* Get right delimiting key. -- little endian */ | |
792 | #define B_PRIGHT_DELIM_KEY(p_s_bh) (&(blk_right_delim_key(B_BLK_HEAD(p_s_bh)) | |
793 | ||
794 | /* Does the buffer contain a disk leaf. */ | |
795 | #define B_IS_ITEMS_LEVEL(p_s_bh) (B_LEVEL(p_s_bh) == DISK_LEAF_NODE_LEVEL) | |
796 | ||
797 | /* Does the buffer contain a disk internal node */ | |
798 | #define B_IS_KEYS_LEVEL(p_s_bh) (B_LEVEL(p_s_bh) > DISK_LEAF_NODE_LEVEL \ | |
799 | && B_LEVEL(p_s_bh) <= MAX_HEIGHT) | |
800 | ||
801 | ||
802 | ||
803 | ||
804 | /***************************************************************************/ | |
805 | /* STAT DATA */ | |
806 | /***************************************************************************/ | |
807 | ||
808 | ||
809 | // | |
810 | // old stat data is 32 bytes long. We are going to distinguish new one by | |
811 | // different size | |
812 | // | |
813 | struct stat_data_v1 | |
814 | { | |
3e8962be AV |
815 | __le16 sd_mode; /* file type, permissions */ |
816 | __le16 sd_nlink; /* number of hard links */ | |
817 | __le16 sd_uid; /* owner */ | |
818 | __le16 sd_gid; /* group */ | |
819 | __le32 sd_size; /* file size */ | |
820 | __le32 sd_atime; /* time of last access */ | |
821 | __le32 sd_mtime; /* time file was last modified */ | |
822 | __le32 sd_ctime; /* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */ | |
1da177e4 | 823 | union { |
3e8962be AV |
824 | __le32 sd_rdev; |
825 | __le32 sd_blocks; /* number of blocks file uses */ | |
1da177e4 | 826 | } __attribute__ ((__packed__)) u; |
3e8962be | 827 | __le32 sd_first_direct_byte; /* first byte of file which is stored |
1da177e4 LT |
828 | in a direct item: except that if it |
829 | equals 1 it is a symlink and if it | |
830 | equals ~(__u32)0 there is no | |
831 | direct item. The existence of this | |
832 | field really grates on me. Let's | |
833 | replace it with a macro based on | |
834 | sd_size and our tail suppression | |
835 | policy. Someday. -Hans */ | |
836 | } __attribute__ ((__packed__)); | |
837 | ||
838 | #define SD_V1_SIZE (sizeof(struct stat_data_v1)) | |
839 | #define stat_data_v1(ih) (ih_version (ih) == KEY_FORMAT_3_5) | |
840 | #define sd_v1_mode(sdp) (le16_to_cpu((sdp)->sd_mode)) | |
841 | #define set_sd_v1_mode(sdp,v) ((sdp)->sd_mode = cpu_to_le16(v)) | |
842 | #define sd_v1_nlink(sdp) (le16_to_cpu((sdp)->sd_nlink)) | |
843 | #define set_sd_v1_nlink(sdp,v) ((sdp)->sd_nlink = cpu_to_le16(v)) | |
844 | #define sd_v1_uid(sdp) (le16_to_cpu((sdp)->sd_uid)) | |
845 | #define set_sd_v1_uid(sdp,v) ((sdp)->sd_uid = cpu_to_le16(v)) | |
846 | #define sd_v1_gid(sdp) (le16_to_cpu((sdp)->sd_gid)) | |
847 | #define set_sd_v1_gid(sdp,v) ((sdp)->sd_gid = cpu_to_le16(v)) | |
848 | #define sd_v1_size(sdp) (le32_to_cpu((sdp)->sd_size)) | |
849 | #define set_sd_v1_size(sdp,v) ((sdp)->sd_size = cpu_to_le32(v)) | |
850 | #define sd_v1_atime(sdp) (le32_to_cpu((sdp)->sd_atime)) | |
851 | #define set_sd_v1_atime(sdp,v) ((sdp)->sd_atime = cpu_to_le32(v)) | |
852 | #define sd_v1_mtime(sdp) (le32_to_cpu((sdp)->sd_mtime)) | |
853 | #define set_sd_v1_mtime(sdp,v) ((sdp)->sd_mtime = cpu_to_le32(v)) | |
854 | #define sd_v1_ctime(sdp) (le32_to_cpu((sdp)->sd_ctime)) | |
855 | #define set_sd_v1_ctime(sdp,v) ((sdp)->sd_ctime = cpu_to_le32(v)) | |
856 | #define sd_v1_rdev(sdp) (le32_to_cpu((sdp)->u.sd_rdev)) | |
857 | #define set_sd_v1_rdev(sdp,v) ((sdp)->u.sd_rdev = cpu_to_le32(v)) | |
858 | #define sd_v1_blocks(sdp) (le32_to_cpu((sdp)->u.sd_blocks)) | |
859 | #define set_sd_v1_blocks(sdp,v) ((sdp)->u.sd_blocks = cpu_to_le32(v)) | |
860 | #define sd_v1_first_direct_byte(sdp) \ | |
861 | (le32_to_cpu((sdp)->sd_first_direct_byte)) | |
862 | #define set_sd_v1_first_direct_byte(sdp,v) \ | |
863 | ((sdp)->sd_first_direct_byte = cpu_to_le32(v)) | |
864 | ||
865 | #include <linux/ext2_fs.h> | |
866 | ||
867 | /* inode flags stored in sd_attrs (nee sd_reserved) */ | |
868 | ||
869 | /* we want common flags to have the same values as in ext2, | |
870 | so chattr(1) will work without problems */ | |
871 | #define REISERFS_IMMUTABLE_FL EXT2_IMMUTABLE_FL | |
872 | #define REISERFS_APPEND_FL EXT2_APPEND_FL | |
873 | #define REISERFS_SYNC_FL EXT2_SYNC_FL | |
874 | #define REISERFS_NOATIME_FL EXT2_NOATIME_FL | |
875 | #define REISERFS_NODUMP_FL EXT2_NODUMP_FL | |
876 | #define REISERFS_SECRM_FL EXT2_SECRM_FL | |
877 | #define REISERFS_UNRM_FL EXT2_UNRM_FL | |
878 | #define REISERFS_COMPR_FL EXT2_COMPR_FL | |
879 | #define REISERFS_NOTAIL_FL EXT2_NOTAIL_FL | |
880 | ||
881 | /* persistent flags that file inherits from the parent directory */ | |
882 | #define REISERFS_INHERIT_MASK ( REISERFS_IMMUTABLE_FL | \ | |
883 | REISERFS_SYNC_FL | \ | |
884 | REISERFS_NOATIME_FL | \ | |
885 | REISERFS_NODUMP_FL | \ | |
886 | REISERFS_SECRM_FL | \ | |
887 | REISERFS_COMPR_FL | \ | |
888 | REISERFS_NOTAIL_FL ) | |
889 | ||
890 | /* Stat Data on disk (reiserfs version of UFS disk inode minus the | |
891 | address blocks) */ | |
892 | struct stat_data { | |
3e8962be AV |
893 | __le16 sd_mode; /* file type, permissions */ |
894 | __le16 sd_attrs; /* persistent inode flags */ | |
895 | __le32 sd_nlink; /* number of hard links */ | |
896 | __le64 sd_size; /* file size */ | |
897 | __le32 sd_uid; /* owner */ | |
898 | __le32 sd_gid; /* group */ | |
899 | __le32 sd_atime; /* time of last access */ | |
900 | __le32 sd_mtime; /* time file was last modified */ | |
901 | __le32 sd_ctime; /* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */ | |
902 | __le32 sd_blocks; | |
1da177e4 | 903 | union { |
3e8962be AV |
904 | __le32 sd_rdev; |
905 | __le32 sd_generation; | |
906 | //__le32 sd_first_direct_byte; | |
1da177e4 LT |
907 | /* first byte of file which is stored in a |
908 | direct item: except that if it equals 1 | |
909 | it is a symlink and if it equals | |
910 | ~(__u32)0 there is no direct item. The | |
911 | existence of this field really grates | |
912 | on me. Let's replace it with a macro | |
913 | based on sd_size and our tail | |
914 | suppression policy? */ | |
915 | } __attribute__ ((__packed__)) u; | |
916 | } __attribute__ ((__packed__)); | |
917 | // | |
918 | // this is 44 bytes long | |
919 | // | |
920 | #define SD_SIZE (sizeof(struct stat_data)) | |
921 | #define SD_V2_SIZE SD_SIZE | |
922 | #define stat_data_v2(ih) (ih_version (ih) == KEY_FORMAT_3_6) | |
923 | #define sd_v2_mode(sdp) (le16_to_cpu((sdp)->sd_mode)) | |
924 | #define set_sd_v2_mode(sdp,v) ((sdp)->sd_mode = cpu_to_le16(v)) | |
925 | /* sd_reserved */ | |
926 | /* set_sd_reserved */ | |
927 | #define sd_v2_nlink(sdp) (le32_to_cpu((sdp)->sd_nlink)) | |
928 | #define set_sd_v2_nlink(sdp,v) ((sdp)->sd_nlink = cpu_to_le32(v)) | |
929 | #define sd_v2_size(sdp) (le64_to_cpu((sdp)->sd_size)) | |
930 | #define set_sd_v2_size(sdp,v) ((sdp)->sd_size = cpu_to_le64(v)) | |
931 | #define sd_v2_uid(sdp) (le32_to_cpu((sdp)->sd_uid)) | |
932 | #define set_sd_v2_uid(sdp,v) ((sdp)->sd_uid = cpu_to_le32(v)) | |
933 | #define sd_v2_gid(sdp) (le32_to_cpu((sdp)->sd_gid)) | |
934 | #define set_sd_v2_gid(sdp,v) ((sdp)->sd_gid = cpu_to_le32(v)) | |
935 | #define sd_v2_atime(sdp) (le32_to_cpu((sdp)->sd_atime)) | |
936 | #define set_sd_v2_atime(sdp,v) ((sdp)->sd_atime = cpu_to_le32(v)) | |
937 | #define sd_v2_mtime(sdp) (le32_to_cpu((sdp)->sd_mtime)) | |
938 | #define set_sd_v2_mtime(sdp,v) ((sdp)->sd_mtime = cpu_to_le32(v)) | |
939 | #define sd_v2_ctime(sdp) (le32_to_cpu((sdp)->sd_ctime)) | |
940 | #define set_sd_v2_ctime(sdp,v) ((sdp)->sd_ctime = cpu_to_le32(v)) | |
941 | #define sd_v2_blocks(sdp) (le32_to_cpu((sdp)->sd_blocks)) | |
942 | #define set_sd_v2_blocks(sdp,v) ((sdp)->sd_blocks = cpu_to_le32(v)) | |
943 | #define sd_v2_rdev(sdp) (le32_to_cpu((sdp)->u.sd_rdev)) | |
944 | #define set_sd_v2_rdev(sdp,v) ((sdp)->u.sd_rdev = cpu_to_le32(v)) | |
945 | #define sd_v2_generation(sdp) (le32_to_cpu((sdp)->u.sd_generation)) | |
946 | #define set_sd_v2_generation(sdp,v) ((sdp)->u.sd_generation = cpu_to_le32(v)) | |
947 | #define sd_v2_attrs(sdp) (le16_to_cpu((sdp)->sd_attrs)) | |
948 | #define set_sd_v2_attrs(sdp,v) ((sdp)->sd_attrs = cpu_to_le16(v)) | |
949 | ||
950 | ||
951 | /***************************************************************************/ | |
952 | /* DIRECTORY STRUCTURE */ | |
953 | /***************************************************************************/ | |
954 | /* | |
955 | Picture represents the structure of directory items | |
956 | ________________________________________________ | |
957 | | Array of | | | | | | | |
958 | | directory |N-1| N-2 | .... | 1st |0th| | |
959 | | entry headers | | | | | | | |
960 | |_______________|___|_____|________|_______|___| | |
961 | <---- directory entries ------> | |
962 | ||
963 | First directory item has k_offset component 1. We store "." and ".." | |
964 | in one item, always, we never split "." and ".." into differing | |
965 | items. This makes, among other things, the code for removing | |
966 | directories simpler. */ | |
967 | #define SD_OFFSET 0 | |
968 | #define SD_UNIQUENESS 0 | |
969 | #define DOT_OFFSET 1 | |
970 | #define DOT_DOT_OFFSET 2 | |
971 | #define DIRENTRY_UNIQUENESS 500 | |
972 | ||
973 | /* */ | |
974 | #define FIRST_ITEM_OFFSET 1 | |
975 | ||
976 | /* | |
977 | Q: How to get key of object pointed to by entry from entry? | |
978 | ||
979 | A: Each directory entry has its header. This header has deh_dir_id and deh_objectid fields, those are key | |
980 | of object, entry points to */ | |
981 | ||
982 | /* NOT IMPLEMENTED: | |
983 | Directory will someday contain stat data of object */ | |
984 | ||
985 | ||
986 | ||
987 | struct reiserfs_de_head | |
988 | { | |
3e8962be AV |
989 | __le32 deh_offset; /* third component of the directory entry key */ |
990 | __le32 deh_dir_id; /* objectid of the parent directory of the object, that is referenced | |
1da177e4 | 991 | by directory entry */ |
3e8962be AV |
992 | __le32 deh_objectid; /* objectid of the object, that is referenced by directory entry */ |
993 | __le16 deh_location; /* offset of name in the whole item */ | |
994 | __le16 deh_state; /* whether 1) entry contains stat data (for future), and 2) whether | |
1da177e4 LT |
995 | entry is hidden (unlinked) */ |
996 | } __attribute__ ((__packed__)); | |
997 | #define DEH_SIZE sizeof(struct reiserfs_de_head) | |
998 | #define deh_offset(p_deh) (le32_to_cpu((p_deh)->deh_offset)) | |
999 | #define deh_dir_id(p_deh) (le32_to_cpu((p_deh)->deh_dir_id)) | |
1000 | #define deh_objectid(p_deh) (le32_to_cpu((p_deh)->deh_objectid)) | |
1001 | #define deh_location(p_deh) (le16_to_cpu((p_deh)->deh_location)) | |
1002 | #define deh_state(p_deh) (le16_to_cpu((p_deh)->deh_state)) | |
1003 | ||
1004 | #define put_deh_offset(p_deh,v) ((p_deh)->deh_offset = cpu_to_le32((v))) | |
1005 | #define put_deh_dir_id(p_deh,v) ((p_deh)->deh_dir_id = cpu_to_le32((v))) | |
1006 | #define put_deh_objectid(p_deh,v) ((p_deh)->deh_objectid = cpu_to_le32((v))) | |
1007 | #define put_deh_location(p_deh,v) ((p_deh)->deh_location = cpu_to_le16((v))) | |
1008 | #define put_deh_state(p_deh,v) ((p_deh)->deh_state = cpu_to_le16((v))) | |
1009 | ||
1010 | /* empty directory contains two entries "." and ".." and their headers */ | |
1011 | #define EMPTY_DIR_SIZE \ | |
1012 | (DEH_SIZE * 2 + ROUND_UP (strlen (".")) + ROUND_UP (strlen (".."))) | |
1013 | ||
1014 | /* old format directories have this size when empty */ | |
1015 | #define EMPTY_DIR_SIZE_V1 (DEH_SIZE * 2 + 3) | |
1016 | ||
1017 | #define DEH_Statdata 0 /* not used now */ | |
1018 | #define DEH_Visible 2 | |
1019 | ||
1020 | /* 64 bit systems (and the S/390) need to be aligned explicitly -jdm */ | |
1021 | #if BITS_PER_LONG == 64 || defined(__s390__) || defined(__hppa__) | |
1022 | # define ADDR_UNALIGNED_BITS (3) | |
1023 | #endif | |
1024 | ||
1025 | /* These are only used to manipulate deh_state. | |
1026 | * Because of this, we'll use the ext2_ bit routines, | |
1027 | * since they are little endian */ | |
1028 | #ifdef ADDR_UNALIGNED_BITS | |
1029 | ||
1030 | # define aligned_address(addr) ((void *)((long)(addr) & ~((1UL << ADDR_UNALIGNED_BITS) - 1))) | |
1031 | # define unaligned_offset(addr) (((int)((long)(addr) & ((1 << ADDR_UNALIGNED_BITS) - 1))) << 3) | |
1032 | ||
1033 | # define set_bit_unaligned(nr, addr) ext2_set_bit((nr) + unaligned_offset(addr), aligned_address(addr)) | |
1034 | # define clear_bit_unaligned(nr, addr) ext2_clear_bit((nr) + unaligned_offset(addr), aligned_address(addr)) | |
1035 | # define test_bit_unaligned(nr, addr) ext2_test_bit((nr) + unaligned_offset(addr), aligned_address(addr)) | |
1036 | ||
1037 | #else | |
1038 | ||
1039 | # define set_bit_unaligned(nr, addr) ext2_set_bit(nr, addr) | |
1040 | # define clear_bit_unaligned(nr, addr) ext2_clear_bit(nr, addr) | |
1041 | # define test_bit_unaligned(nr, addr) ext2_test_bit(nr, addr) | |
1042 | ||
1043 | #endif | |
1044 | ||
1045 | #define mark_de_with_sd(deh) set_bit_unaligned (DEH_Statdata, &((deh)->deh_state)) | |
1046 | #define mark_de_without_sd(deh) clear_bit_unaligned (DEH_Statdata, &((deh)->deh_state)) | |
1047 | #define mark_de_visible(deh) set_bit_unaligned (DEH_Visible, &((deh)->deh_state)) | |
1048 | #define mark_de_hidden(deh) clear_bit_unaligned (DEH_Visible, &((deh)->deh_state)) | |
1049 | ||
1050 | #define de_with_sd(deh) test_bit_unaligned (DEH_Statdata, &((deh)->deh_state)) | |
1051 | #define de_visible(deh) test_bit_unaligned (DEH_Visible, &((deh)->deh_state)) | |
1052 | #define de_hidden(deh) !test_bit_unaligned (DEH_Visible, &((deh)->deh_state)) | |
1053 | ||
3e8962be AV |
1054 | extern void make_empty_dir_item_v1 (char * body, __le32 dirid, __le32 objid, |
1055 | __le32 par_dirid, __le32 par_objid); | |
1056 | extern void make_empty_dir_item (char * body, __le32 dirid, __le32 objid, | |
1057 | __le32 par_dirid, __le32 par_objid); | |
1da177e4 LT |
1058 | |
1059 | /* array of the entry headers */ | |
1060 | /* get item body */ | |
1061 | #define B_I_PITEM(bh,ih) ( (bh)->b_data + ih_location(ih) ) | |
1062 | #define B_I_DEH(bh,ih) ((struct reiserfs_de_head *)(B_I_PITEM(bh,ih))) | |
1063 | ||
1064 | /* length of the directory entry in directory item. This define | |
1065 | calculates length of i-th directory entry using directory entry | |
1066 | locations from dir entry head. When it calculates length of 0-th | |
1067 | directory entry, it uses length of whole item in place of entry | |
1068 | location of the non-existent following entry in the calculation. | |
1069 | See picture above.*/ | |
1070 | /* | |
1071 | #define I_DEH_N_ENTRY_LENGTH(ih,deh,i) \ | |
1072 | ((i) ? (deh_location((deh)-1) - deh_location((deh))) : (ih_item_len((ih)) - deh_location((deh)))) | |
1073 | */ | |
1074 | static inline int entry_length (const struct buffer_head * bh, | |
1075 | const struct item_head * ih, int pos_in_item) | |
1076 | { | |
1077 | struct reiserfs_de_head * deh; | |
1078 | ||
1079 | deh = B_I_DEH (bh, ih) + pos_in_item; | |
1080 | if (pos_in_item) | |
1081 | return deh_location(deh-1) - deh_location(deh); | |
1082 | ||
1083 | return ih_item_len(ih) - deh_location(deh); | |
1084 | } | |
1085 | ||
1086 | ||
1087 | ||
1088 | /* number of entries in the directory item, depends on ENTRY_COUNT being at the start of directory dynamic data. */ | |
1089 | #define I_ENTRY_COUNT(ih) (ih_entry_count((ih))) | |
1090 | ||
1091 | ||
1092 | /* name by bh, ih and entry_num */ | |
1093 | #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)))) | |
1094 | ||
1095 | // two entries per block (at least) | |
1096 | #define REISERFS_MAX_NAME(block_size) 255 | |
1097 | ||
1098 | ||
1099 | /* this structure is used for operations on directory entries. It is | |
1100 | not a disk structure. */ | |
1101 | /* When reiserfs_find_entry or search_by_entry_key find directory | |
1102 | entry, they return filled reiserfs_dir_entry structure */ | |
1103 | struct reiserfs_dir_entry | |
1104 | { | |
1105 | struct buffer_head * de_bh; | |
1106 | int de_item_num; | |
1107 | struct item_head * de_ih; | |
1108 | int de_entry_num; | |
1109 | struct reiserfs_de_head * de_deh; | |
1110 | int de_entrylen; | |
1111 | int de_namelen; | |
1112 | char * de_name; | |
1113 | char * de_gen_number_bit_string; | |
1114 | ||
1115 | __u32 de_dir_id; | |
1116 | __u32 de_objectid; | |
1117 | ||
1118 | struct cpu_key de_entry_key; | |
1119 | }; | |
1120 | ||
1121 | /* these defines are useful when a particular member of a reiserfs_dir_entry is needed */ | |
1122 | ||
1123 | /* pointer to file name, stored in entry */ | |
1124 | #define B_I_DEH_ENTRY_FILE_NAME(bh,ih,deh) (B_I_PITEM (bh, ih) + deh_location(deh)) | |
1125 | ||
1126 | /* length of name */ | |
1127 | #define I_DEH_N_ENTRY_FILE_NAME_LENGTH(ih,deh,entry_num) \ | |
1128 | (I_DEH_N_ENTRY_LENGTH (ih, deh, entry_num) - (de_with_sd (deh) ? SD_SIZE : 0)) | |
1129 | ||
1130 | ||
1131 | ||
1132 | /* hash value occupies bits from 7 up to 30 */ | |
1133 | #define GET_HASH_VALUE(offset) ((offset) & 0x7fffff80LL) | |
1134 | /* generation number occupies 7 bits starting from 0 up to 6 */ | |
1135 | #define GET_GENERATION_NUMBER(offset) ((offset) & 0x7fLL) | |
1136 | #define MAX_GENERATION_NUMBER 127 | |
1137 | ||
1138 | #define SET_GENERATION_NUMBER(offset,gen_number) (GET_HASH_VALUE(offset)|(gen_number)) | |
1139 | ||
1140 | ||
1141 | /* | |
1142 | * Picture represents an internal node of the reiserfs tree | |
1143 | * ______________________________________________________ | |
1144 | * | | Array of | Array of | Free | | |
1145 | * |block | keys | pointers | space | | |
1146 | * | head | N | N+1 | | | |
1147 | * |______|_______________|___________________|___________| | |
1148 | */ | |
1149 | ||
1150 | /***************************************************************************/ | |
1151 | /* DISK CHILD */ | |
1152 | /***************************************************************************/ | |
1153 | /* Disk child pointer: The pointer from an internal node of the tree | |
1154 | to a node that is on disk. */ | |
1155 | struct disk_child { | |
3e8962be AV |
1156 | __le32 dc_block_number; /* Disk child's block number. */ |
1157 | __le16 dc_size; /* Disk child's used space. */ | |
1158 | __le16 dc_reserved; | |
1da177e4 LT |
1159 | }; |
1160 | ||
1161 | #define DC_SIZE (sizeof(struct disk_child)) | |
1162 | #define dc_block_number(dc_p) (le32_to_cpu((dc_p)->dc_block_number)) | |
1163 | #define dc_size(dc_p) (le16_to_cpu((dc_p)->dc_size)) | |
1164 | #define put_dc_block_number(dc_p, val) do { (dc_p)->dc_block_number = cpu_to_le32(val); } while(0) | |
1165 | #define put_dc_size(dc_p, val) do { (dc_p)->dc_size = cpu_to_le16(val); } while(0) | |
1166 | ||
1167 | /* Get disk child by buffer header and position in the tree node. */ | |
1168 | #define B_N_CHILD(p_s_bh,n_pos) ((struct disk_child *)\ | |
1169 | ((p_s_bh)->b_data+BLKH_SIZE+B_NR_ITEMS(p_s_bh)*KEY_SIZE+DC_SIZE*(n_pos))) | |
1170 | ||
1171 | /* Get disk child number by buffer header and position in the tree node. */ | |
1172 | #define B_N_CHILD_NUM(p_s_bh,n_pos) (dc_block_number(B_N_CHILD(p_s_bh,n_pos))) | |
1173 | #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 )) | |
1174 | ||
1175 | /* maximal value of field child_size in structure disk_child */ | |
1176 | /* child size is the combined size of all items and their headers */ | |
1177 | #define MAX_CHILD_SIZE(bh) ((int)( (bh)->b_size - BLKH_SIZE )) | |
1178 | ||
1179 | /* amount of used space in buffer (not including block head) */ | |
1180 | #define B_CHILD_SIZE(cur) (MAX_CHILD_SIZE(cur)-(B_FREE_SPACE(cur))) | |
1181 | ||
1182 | /* max and min number of keys in internal node */ | |
1183 | #define MAX_NR_KEY(bh) ( (MAX_CHILD_SIZE(bh)-DC_SIZE)/(KEY_SIZE+DC_SIZE) ) | |
1184 | #define MIN_NR_KEY(bh) (MAX_NR_KEY(bh)/2) | |
1185 | ||
1186 | /***************************************************************************/ | |
1187 | /* PATH STRUCTURES AND DEFINES */ | |
1188 | /***************************************************************************/ | |
1189 | ||
1190 | ||
1191 | /* Search_by_key fills up the path from the root to the leaf as it descends the tree looking for the | |
1192 | key. It uses reiserfs_bread to try to find buffers in the cache given their block number. If it | |
1193 | does not find them in the cache it reads them from disk. For each node search_by_key finds using | |
1194 | reiserfs_bread it then uses bin_search to look through that node. bin_search will find the | |
1195 | position of the block_number of the next node if it is looking through an internal node. If it | |
1196 | is looking through a leaf node bin_search will find the position of the item which has key either | |
1197 | equal to given key, or which is the maximal key less than the given key. */ | |
1198 | ||
1199 | struct path_element { | |
1200 | struct buffer_head * pe_buffer; /* Pointer to the buffer at the path in the tree. */ | |
1201 | int pe_position; /* Position in the tree node which is placed in the */ | |
1202 | /* buffer above. */ | |
1203 | }; | |
1204 | ||
1205 | #define MAX_HEIGHT 5 /* maximal height of a tree. don't change this without changing JOURNAL_PER_BALANCE_CNT */ | |
1206 | #define EXTENDED_MAX_HEIGHT 7 /* Must be equals MAX_HEIGHT + FIRST_PATH_ELEMENT_OFFSET */ | |
1207 | #define FIRST_PATH_ELEMENT_OFFSET 2 /* Must be equal to at least 2. */ | |
1208 | ||
1209 | #define ILLEGAL_PATH_ELEMENT_OFFSET 1 /* Must be equal to FIRST_PATH_ELEMENT_OFFSET - 1 */ | |
1210 | #define MAX_FEB_SIZE 6 /* this MUST be MAX_HEIGHT + 1. See about FEB below */ | |
1211 | ||
1212 | ||
1213 | ||
1214 | /* We need to keep track of who the ancestors of nodes are. When we | |
1215 | perform a search we record which nodes were visited while | |
1216 | descending the tree looking for the node we searched for. This list | |
1217 | of nodes is called the path. This information is used while | |
1218 | performing balancing. Note that this path information may become | |
1219 | invalid, and this means we must check it when using it to see if it | |
1220 | is still valid. You'll need to read search_by_key and the comments | |
1221 | in it, especially about decrement_counters_in_path(), to understand | |
1222 | this structure. | |
1223 | ||
1224 | Paths make the code so much harder to work with and debug.... An | |
1225 | enormous number of bugs are due to them, and trying to write or modify | |
1226 | code that uses them just makes my head hurt. They are based on an | |
1227 | excessive effort to avoid disturbing the precious VFS code.:-( The | |
1228 | gods only know how we are going to SMP the code that uses them. | |
1229 | znodes are the way! */ | |
1230 | ||
1231 | #define PATH_READA 0x1 /* do read ahead */ | |
1232 | #define PATH_READA_BACK 0x2 /* read backwards */ | |
1233 | ||
1234 | struct path { | |
1235 | int path_length; /* Length of the array above. */ | |
1236 | int reada; | |
1237 | struct path_element path_elements[EXTENDED_MAX_HEIGHT]; /* Array of the path elements. */ | |
1238 | int pos_in_item; | |
1239 | }; | |
1240 | ||
1241 | #define pos_in_item(path) ((path)->pos_in_item) | |
1242 | ||
1243 | #define INITIALIZE_PATH(var) \ | |
1244 | struct path var = {.path_length = ILLEGAL_PATH_ELEMENT_OFFSET, .reada = 0,} | |
1245 | ||
1246 | /* Get path element by path and path position. */ | |
1247 | #define PATH_OFFSET_PELEMENT(p_s_path,n_offset) ((p_s_path)->path_elements +(n_offset)) | |
1248 | ||
1249 | /* Get buffer header at the path by path and path position. */ | |
1250 | #define PATH_OFFSET_PBUFFER(p_s_path,n_offset) (PATH_OFFSET_PELEMENT(p_s_path,n_offset)->pe_buffer) | |
1251 | ||
1252 | /* Get position in the element at the path by path and path position. */ | |
1253 | #define PATH_OFFSET_POSITION(p_s_path,n_offset) (PATH_OFFSET_PELEMENT(p_s_path,n_offset)->pe_position) | |
1254 | ||
1255 | ||
1256 | #define PATH_PLAST_BUFFER(p_s_path) (PATH_OFFSET_PBUFFER((p_s_path), (p_s_path)->path_length)) | |
1257 | /* you know, to the person who didn't | |
1258 | write this the macro name does not | |
1259 | at first suggest what it does. | |
1260 | Maybe POSITION_FROM_PATH_END? Or | |
1261 | maybe we should just focus on | |
1262 | dumping paths... -Hans */ | |
1263 | #define PATH_LAST_POSITION(p_s_path) (PATH_OFFSET_POSITION((p_s_path), (p_s_path)->path_length)) | |
1264 | ||
1265 | ||
1266 | #define PATH_PITEM_HEAD(p_s_path) B_N_PITEM_HEAD(PATH_PLAST_BUFFER(p_s_path),PATH_LAST_POSITION(p_s_path)) | |
1267 | ||
1268 | /* in do_balance leaf has h == 0 in contrast with path structure, | |
1269 | where root has level == 0. That is why we need these defines */ | |
1270 | #define PATH_H_PBUFFER(p_s_path, h) PATH_OFFSET_PBUFFER (p_s_path, p_s_path->path_length - (h)) /* tb->S[h] */ | |
1271 | #define PATH_H_PPARENT(path, h) PATH_H_PBUFFER (path, (h) + 1) /* tb->F[h] or tb->S[0]->b_parent */ | |
1272 | #define PATH_H_POSITION(path, h) PATH_OFFSET_POSITION (path, path->path_length - (h)) | |
1273 | #define PATH_H_B_ITEM_ORDER(path, h) PATH_H_POSITION(path, h + 1) /* tb->S[h]->b_item_order */ | |
1274 | ||
1275 | #define PATH_H_PATH_OFFSET(p_s_path, n_h) ((p_s_path)->path_length - (n_h)) | |
1276 | ||
1277 | #define get_last_bh(path) PATH_PLAST_BUFFER(path) | |
1278 | #define get_ih(path) PATH_PITEM_HEAD(path) | |
1279 | #define get_item_pos(path) PATH_LAST_POSITION(path) | |
1280 | #define get_item(path) ((void *)B_N_PITEM(PATH_PLAST_BUFFER(path), PATH_LAST_POSITION (path))) | |
1281 | #define item_moved(ih,path) comp_items(ih, path) | |
1282 | #define path_changed(ih,path) comp_items (ih, path) | |
1283 | ||
1284 | ||
1285 | /***************************************************************************/ | |
1286 | /* MISC */ | |
1287 | /***************************************************************************/ | |
1288 | ||
1289 | /* Size of pointer to the unformatted node. */ | |
1290 | #define UNFM_P_SIZE (sizeof(unp_t)) | |
1291 | #define UNFM_P_SHIFT 2 | |
1292 | ||
1293 | // in in-core inode key is stored on le form | |
1294 | #define INODE_PKEY(inode) ((struct reiserfs_key *)(REISERFS_I(inode)->i_key)) | |
1295 | ||
1296 | #define MAX_UL_INT 0xffffffff | |
1297 | #define MAX_INT 0x7ffffff | |
1298 | #define MAX_US_INT 0xffff | |
1299 | ||
1300 | // reiserfs version 2 has max offset 60 bits. Version 1 - 32 bit offset | |
1301 | #define U32_MAX (~(__u32)0) | |
1302 | ||
1303 | static inline loff_t max_reiserfs_offset (struct inode * inode) | |
1304 | { | |
1305 | if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5) | |
1306 | return (loff_t)U32_MAX; | |
1307 | ||
1308 | return (loff_t)((~(__u64)0) >> 4); | |
1309 | } | |
1310 | ||
1311 | ||
1312 | /*#define MAX_KEY_UNIQUENESS MAX_UL_INT*/ | |
1313 | #define MAX_KEY_OBJECTID MAX_UL_INT | |
1314 | ||
1315 | ||
1316 | #define MAX_B_NUM MAX_UL_INT | |
1317 | #define MAX_FC_NUM MAX_US_INT | |
1318 | ||
1319 | ||
1320 | /* the purpose is to detect overflow of an unsigned short */ | |
1321 | #define REISERFS_LINK_MAX (MAX_US_INT - 1000) | |
1322 | ||
1323 | ||
1324 | /* The following defines are used in reiserfs_insert_item and reiserfs_append_item */ | |
1325 | #define REISERFS_KERNEL_MEM 0 /* reiserfs kernel memory mode */ | |
1326 | #define REISERFS_USER_MEM 1 /* reiserfs user memory mode */ | |
1327 | ||
1328 | #define fs_generation(s) (REISERFS_SB(s)->s_generation_counter) | |
1329 | #define get_generation(s) atomic_read (&fs_generation(s)) | |
1330 | #define FILESYSTEM_CHANGED_TB(tb) (get_generation((tb)->tb_sb) != (tb)->fs_gen) | |
1331 | #define __fs_changed(gen,s) (gen != get_generation (s)) | |
1332 | #define fs_changed(gen,s) ({cond_resched(); __fs_changed(gen, s);}) | |
1333 | ||
1334 | ||
1335 | /***************************************************************************/ | |
1336 | /* FIXATE NODES */ | |
1337 | /***************************************************************************/ | |
1338 | ||
1339 | #define VI_TYPE_LEFT_MERGEABLE 1 | |
1340 | #define VI_TYPE_RIGHT_MERGEABLE 2 | |
1341 | ||
1342 | /* To make any changes in the tree we always first find node, that | |
1343 | contains item to be changed/deleted or place to insert a new | |
1344 | item. We call this node S. To do balancing we need to decide what | |
1345 | we will shift to left/right neighbor, or to a new node, where new | |
1346 | item will be etc. To make this analysis simpler we build virtual | |
1347 | node. Virtual node is an array of items, that will replace items of | |
1348 | node S. (For instance if we are going to delete an item, virtual | |
1349 | node does not contain it). Virtual node keeps information about | |
1350 | item sizes and types, mergeability of first and last items, sizes | |
1351 | of all entries in directory item. We use this array of items when | |
1352 | calculating what we can shift to neighbors and how many nodes we | |
1353 | have to have if we do not any shiftings, if we shift to left/right | |
1354 | neighbor or to both. */ | |
1355 | struct virtual_item | |
1356 | { | |
1357 | int vi_index; // index in the array of item operations | |
1358 | unsigned short vi_type; // left/right mergeability | |
1359 | unsigned short vi_item_len; /* length of item that it will have after balancing */ | |
1360 | struct item_head * vi_ih; | |
1361 | const char * vi_item; // body of item (old or new) | |
1362 | const void * vi_new_data; // 0 always but paste mode | |
1363 | void * vi_uarea; // item specific area | |
1364 | }; | |
1365 | ||
1366 | ||
1367 | struct virtual_node | |
1368 | { | |
1369 | char * vn_free_ptr; /* this is a pointer to the free space in the buffer */ | |
1370 | unsigned short vn_nr_item; /* number of items in virtual node */ | |
1371 | short vn_size; /* size of node , that node would have if it has unlimited size and no balancing is performed */ | |
1372 | short vn_mode; /* mode of balancing (paste, insert, delete, cut) */ | |
1373 | short vn_affected_item_num; | |
1374 | short vn_pos_in_item; | |
1375 | struct item_head * vn_ins_ih; /* item header of inserted item, 0 for other modes */ | |
1376 | const void * vn_data; | |
1377 | struct virtual_item * vn_vi; /* array of items (including a new one, excluding item to be deleted) */ | |
1378 | }; | |
1379 | ||
1380 | /* used by directory items when creating virtual nodes */ | |
1381 | struct direntry_uarea { | |
1382 | int flags; | |
1383 | __u16 entry_count; | |
1384 | __u16 entry_sizes[1]; | |
1385 | } __attribute__ ((__packed__)) ; | |
1386 | ||
1387 | ||
1388 | /***************************************************************************/ | |
1389 | /* TREE BALANCE */ | |
1390 | /***************************************************************************/ | |
1391 | ||
1392 | /* This temporary structure is used in tree balance algorithms, and | |
1393 | constructed as we go to the extent that its various parts are | |
1394 | needed. It contains arrays of nodes that can potentially be | |
1395 | involved in the balancing of node S, and parameters that define how | |
1396 | each of the nodes must be balanced. Note that in these algorithms | |
1397 | for balancing the worst case is to need to balance the current node | |
1398 | S and the left and right neighbors and all of their parents plus | |
1399 | create a new node. We implement S1 balancing for the leaf nodes | |
1400 | and S0 balancing for the internal nodes (S1 and S0 are defined in | |
1401 | our papers.)*/ | |
1402 | ||
1403 | #define MAX_FREE_BLOCK 7 /* size of the array of buffers to free at end of do_balance */ | |
1404 | ||
1405 | /* maximum number of FEB blocknrs on a single level */ | |
1406 | #define MAX_AMOUNT_NEEDED 2 | |
1407 | ||
1408 | /* someday somebody will prefix every field in this struct with tb_ */ | |
1409 | struct tree_balance | |
1410 | { | |
1411 | int tb_mode; | |
1412 | int need_balance_dirty; | |
1413 | struct super_block * tb_sb; | |
1414 | struct reiserfs_transaction_handle *transaction_handle ; | |
1415 | struct path * tb_path; | |
1416 | struct buffer_head * L[MAX_HEIGHT]; /* array of left neighbors of nodes in the path */ | |
1417 | struct buffer_head * R[MAX_HEIGHT]; /* array of right neighbors of nodes in the path*/ | |
1418 | struct buffer_head * FL[MAX_HEIGHT]; /* array of fathers of the left neighbors */ | |
1419 | struct buffer_head * FR[MAX_HEIGHT]; /* array of fathers of the right neighbors */ | |
1420 | struct buffer_head * CFL[MAX_HEIGHT]; /* array of common parents of center node and its left neighbor */ | |
1421 | struct buffer_head * CFR[MAX_HEIGHT]; /* array of common parents of center node and its right neighbor */ | |
1422 | ||
1423 | struct buffer_head * FEB[MAX_FEB_SIZE]; /* array of empty buffers. Number of buffers in array equals | |
1424 | cur_blknum. */ | |
1425 | struct buffer_head * used[MAX_FEB_SIZE]; | |
1426 | struct buffer_head * thrown[MAX_FEB_SIZE]; | |
1427 | int lnum[MAX_HEIGHT]; /* array of number of items which must be | |
1428 | shifted to the left in order to balance the | |
1429 | current node; for leaves includes item that | |
1430 | will be partially shifted; for internal | |
1431 | nodes, it is the number of child pointers | |
1432 | rather than items. It includes the new item | |
1433 | being created. The code sometimes subtracts | |
1434 | one to get the number of wholly shifted | |
1435 | items for other purposes. */ | |
1436 | int rnum[MAX_HEIGHT]; /* substitute right for left in comment above */ | |
1437 | int lkey[MAX_HEIGHT]; /* array indexed by height h mapping the key delimiting L[h] and | |
1438 | S[h] to its item number within the node CFL[h] */ | |
1439 | int rkey[MAX_HEIGHT]; /* substitute r for l in comment above */ | |
1440 | int insert_size[MAX_HEIGHT]; /* the number of bytes by we are trying to add or remove from | |
1441 | S[h]. A negative value means removing. */ | |
1442 | int blknum[MAX_HEIGHT]; /* number of nodes that will replace node S[h] after | |
1443 | balancing on the level h of the tree. If 0 then S is | |
1444 | being deleted, if 1 then S is remaining and no new nodes | |
1445 | are being created, if 2 or 3 then 1 or 2 new nodes is | |
1446 | being created */ | |
1447 | ||
1448 | /* fields that are used only for balancing leaves of the tree */ | |
1449 | int cur_blknum; /* number of empty blocks having been already allocated */ | |
1450 | int s0num; /* number of items that fall into left most node when S[0] splits */ | |
1451 | int s1num; /* number of items that fall into first new node when S[0] splits */ | |
1452 | int s2num; /* number of items that fall into second new node when S[0] splits */ | |
1453 | int lbytes; /* number of bytes which can flow to the left neighbor from the left */ | |
1454 | /* most liquid item that cannot be shifted from S[0] entirely */ | |
1455 | /* if -1 then nothing will be partially shifted */ | |
1456 | int rbytes; /* number of bytes which will flow to the right neighbor from the right */ | |
1457 | /* most liquid item that cannot be shifted from S[0] entirely */ | |
1458 | /* if -1 then nothing will be partially shifted */ | |
1459 | int s1bytes; /* number of bytes which flow to the first new node when S[0] splits */ | |
1460 | /* note: if S[0] splits into 3 nodes, then items do not need to be cut */ | |
1461 | int s2bytes; | |
1462 | struct buffer_head * buf_to_free[MAX_FREE_BLOCK]; /* buffers which are to be freed after do_balance finishes by unfix_nodes */ | |
1463 | char * vn_buf; /* kmalloced memory. Used to create | |
1464 | virtual node and keep map of | |
1465 | dirtied bitmap blocks */ | |
1466 | int vn_buf_size; /* size of the vn_buf */ | |
1467 | struct virtual_node * tb_vn; /* VN starts after bitmap of bitmap blocks */ | |
1468 | ||
1469 | int fs_gen; /* saved value of `reiserfs_generation' counter | |
1470 | see FILESYSTEM_CHANGED() macro in reiserfs_fs.h */ | |
1471 | #ifdef DISPLACE_NEW_PACKING_LOCALITIES | |
6a3a16f2 | 1472 | struct in_core_key key; /* key pointer, to pass to block allocator or |
1da177e4 LT |
1473 | another low-level subsystem */ |
1474 | #endif | |
1475 | } ; | |
1476 | ||
1477 | /* These are modes of balancing */ | |
1478 | ||
1479 | /* When inserting an item. */ | |
1480 | #define M_INSERT 'i' | |
1481 | /* When inserting into (directories only) or appending onto an already | |
1482 | existant item. */ | |
1483 | #define M_PASTE 'p' | |
1484 | /* When deleting an item. */ | |
1485 | #define M_DELETE 'd' | |
1486 | /* When truncating an item or removing an entry from a (directory) item. */ | |
1487 | #define M_CUT 'c' | |
1488 | ||
1489 | /* used when balancing on leaf level skipped (in reiserfsck) */ | |
1490 | #define M_INTERNAL 'n' | |
1491 | ||
1492 | /* When further balancing is not needed, then do_balance does not need | |
1493 | to be called. */ | |
1494 | #define M_SKIP_BALANCING 's' | |
1495 | #define M_CONVERT 'v' | |
1496 | ||
1497 | /* modes of leaf_move_items */ | |
1498 | #define LEAF_FROM_S_TO_L 0 | |
1499 | #define LEAF_FROM_S_TO_R 1 | |
1500 | #define LEAF_FROM_R_TO_L 2 | |
1501 | #define LEAF_FROM_L_TO_R 3 | |
1502 | #define LEAF_FROM_S_TO_SNEW 4 | |
1503 | ||
1504 | #define FIRST_TO_LAST 0 | |
1505 | #define LAST_TO_FIRST 1 | |
1506 | ||
1507 | /* used in do_balance for passing parent of node information that has | |
1508 | been gotten from tb struct */ | |
1509 | struct buffer_info { | |
1510 | struct tree_balance * tb; | |
1511 | struct buffer_head * bi_bh; | |
1512 | struct buffer_head * bi_parent; | |
1513 | int bi_position; | |
1514 | }; | |
1515 | ||
1516 | ||
1517 | /* there are 4 types of items: stat data, directory item, indirect, direct. | |
1518 | +-------------------+------------+--------------+------------+ | |
1519 | | | k_offset | k_uniqueness | mergeable? | | |
1520 | +-------------------+------------+--------------+------------+ | |
1521 | | stat data | 0 | 0 | no | | |
1522 | +-------------------+------------+--------------+------------+ | |
1523 | | 1st directory item| DOT_OFFSET |DIRENTRY_UNIQUENESS| no | | |
1524 | | non 1st directory | hash value | | yes | | |
1525 | | item | | | | | |
1526 | +-------------------+------------+--------------+------------+ | |
1527 | | indirect item | offset + 1 |TYPE_INDIRECT | if this is not the first indirect item of the object | |
1528 | +-------------------+------------+--------------+------------+ | |
1529 | | direct item | offset + 1 |TYPE_DIRECT | if not this is not the first direct item of the object | |
1530 | +-------------------+------------+--------------+------------+ | |
1531 | */ | |
1532 | ||
1533 | struct item_operations { | |
1534 | int (*bytes_number) (struct item_head * ih, int block_size); | |
1535 | void (*decrement_key) (struct cpu_key *); | |
1536 | int (*is_left_mergeable) (struct reiserfs_key * ih, unsigned long bsize); | |
1537 | void (*print_item) (struct item_head *, char * item); | |
1538 | void (*check_item) (struct item_head *, char * item); | |
1539 | ||
1540 | int (*create_vi) (struct virtual_node * vn, struct virtual_item * vi, | |
1541 | int is_affected, int insert_size); | |
1542 | int (*check_left) (struct virtual_item * vi, int free, | |
1543 | int start_skip, int end_skip); | |
1544 | int (*check_right) (struct virtual_item * vi, int free); | |
1545 | int (*part_size) (struct virtual_item * vi, int from, int to); | |
1546 | int (*unit_num) (struct virtual_item * vi); | |
1547 | void (*print_vi) (struct virtual_item * vi); | |
1548 | }; | |
1549 | ||
1550 | ||
1551 | extern struct item_operations * item_ops [TYPE_ANY + 1]; | |
1552 | ||
1553 | #define op_bytes_number(ih,bsize) item_ops[le_ih_k_type (ih)]->bytes_number (ih, bsize) | |
1554 | #define op_is_left_mergeable(key,bsize) item_ops[le_key_k_type (le_key_version (key), key)]->is_left_mergeable (key, bsize) | |
1555 | #define op_print_item(ih,item) item_ops[le_ih_k_type (ih)]->print_item (ih, item) | |
1556 | #define op_check_item(ih,item) item_ops[le_ih_k_type (ih)]->check_item (ih, item) | |
1557 | #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) | |
1558 | #define op_check_left(vi,free,start_skip,end_skip) item_ops[(vi)->vi_index]->check_left (vi, free, start_skip, end_skip) | |
1559 | #define op_check_right(vi,free) item_ops[(vi)->vi_index]->check_right (vi, free) | |
1560 | #define op_part_size(vi,from,to) item_ops[(vi)->vi_index]->part_size (vi, from, to) | |
1561 | #define op_unit_num(vi) item_ops[(vi)->vi_index]->unit_num (vi) | |
1562 | #define op_print_vi(vi) item_ops[(vi)->vi_index]->print_vi (vi) | |
1563 | ||
1564 | ||
1565 | ||
1566 | #define COMP_SHORT_KEYS comp_short_keys | |
1567 | ||
1568 | /* number of blocks pointed to by the indirect item */ | |
1569 | #define I_UNFM_NUM(p_s_ih) ( ih_item_len(p_s_ih) / UNFM_P_SIZE ) | |
1570 | ||
1571 | /* the used space within the unformatted node corresponding to pos within the item pointed to by ih */ | |
1572 | #define I_POS_UNFM_SIZE(ih,pos,size) (((pos) == I_UNFM_NUM(ih) - 1 ) ? (size) - ih_free_space(ih) : (size)) | |
1573 | ||
1574 | /* number of bytes contained by the direct item or the unformatted nodes the indirect item points to */ | |
1575 | ||
1576 | ||
1577 | /* get the item header */ | |
1578 | #define B_N_PITEM_HEAD(bh,item_num) ( (struct item_head * )((bh)->b_data + BLKH_SIZE) + (item_num) ) | |
1579 | ||
1580 | /* get key */ | |
1581 | #define B_N_PDELIM_KEY(bh,item_num) ( (struct reiserfs_key * )((bh)->b_data + BLKH_SIZE) + (item_num) ) | |
1582 | ||
1583 | /* get the key */ | |
1584 | #define B_N_PKEY(bh,item_num) ( &(B_N_PITEM_HEAD(bh,item_num)->ih_key) ) | |
1585 | ||
1586 | /* get item body */ | |
1587 | #define B_N_PITEM(bh,item_num) ( (bh)->b_data + ih_location(B_N_PITEM_HEAD((bh),(item_num)))) | |
1588 | ||
1589 | /* get the stat data by the buffer header and the item order */ | |
1590 | #define B_N_STAT_DATA(bh,nr) \ | |
1591 | ( (struct stat_data *)((bh)->b_data + ih_location(B_N_PITEM_HEAD((bh),(nr))) ) ) | |
1592 | ||
1593 | /* following defines use reiserfs buffer header and item header */ | |
1594 | ||
1595 | /* get stat-data */ | |
1596 | #define B_I_STAT_DATA(bh, ih) ( (struct stat_data * )((bh)->b_data + ih_location(ih)) ) | |
1597 | ||
1598 | // this is 3976 for size==4096 | |
1599 | #define MAX_DIRECT_ITEM_LEN(size) ((size) - BLKH_SIZE - 2*IH_SIZE - SD_SIZE - UNFM_P_SIZE) | |
1600 | ||
1601 | /* indirect items consist of entries which contain blocknrs, pos | |
1602 | indicates which entry, and B_I_POS_UNFM_POINTER resolves to the | |
1603 | blocknr contained by the entry pos points to */ | |
1604 | #define B_I_POS_UNFM_POINTER(bh,ih,pos) le32_to_cpu(*(((unp_t *)B_I_PITEM(bh,ih)) + (pos))) | |
1605 | #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) | |
1606 | ||
1607 | struct reiserfs_iget_args { | |
1608 | __u32 objectid ; | |
1609 | __u32 dirid ; | |
1610 | } ; | |
1611 | ||
1612 | /***************************************************************************/ | |
1613 | /* FUNCTION DECLARATIONS */ | |
1614 | /***************************************************************************/ | |
1615 | ||
1616 | /*#ifdef __KERNEL__*/ | |
1617 | #define get_journal_desc_magic(bh) (bh->b_data + bh->b_size - 12) | |
1618 | ||
1619 | #define journal_trans_half(blocksize) \ | |
1620 | ((blocksize - sizeof (struct reiserfs_journal_desc) + sizeof (__u32) - 12) / sizeof (__u32)) | |
1621 | ||
1622 | /* journal.c see journal.c for all the comments here */ | |
1623 | ||
1624 | /* first block written in a commit. */ | |
1625 | struct reiserfs_journal_desc { | |
3e8962be AV |
1626 | __le32 j_trans_id ; /* id of commit */ |
1627 | __le32 j_len ; /* length of commit. len +1 is the commit block */ | |
1628 | __le32 j_mount_id ; /* mount id of this trans*/ | |
1629 | __le32 j_realblock[1] ; /* real locations for each block */ | |
1da177e4 LT |
1630 | } ; |
1631 | ||
1632 | #define get_desc_trans_id(d) le32_to_cpu((d)->j_trans_id) | |
1633 | #define get_desc_trans_len(d) le32_to_cpu((d)->j_len) | |
1634 | #define get_desc_mount_id(d) le32_to_cpu((d)->j_mount_id) | |
1635 | ||
1636 | #define set_desc_trans_id(d,val) do { (d)->j_trans_id = cpu_to_le32 (val); } while (0) | |
1637 | #define set_desc_trans_len(d,val) do { (d)->j_len = cpu_to_le32 (val); } while (0) | |
1638 | #define set_desc_mount_id(d,val) do { (d)->j_mount_id = cpu_to_le32 (val); } while (0) | |
1639 | ||
1640 | /* last block written in a commit */ | |
1641 | struct reiserfs_journal_commit { | |
3e8962be AV |
1642 | __le32 j_trans_id ; /* must match j_trans_id from the desc block */ |
1643 | __le32 j_len ; /* ditto */ | |
1644 | __le32 j_realblock[1] ; /* real locations for each block */ | |
1da177e4 LT |
1645 | } ; |
1646 | ||
1647 | #define get_commit_trans_id(c) le32_to_cpu((c)->j_trans_id) | |
1648 | #define get_commit_trans_len(c) le32_to_cpu((c)->j_len) | |
1649 | #define get_commit_mount_id(c) le32_to_cpu((c)->j_mount_id) | |
1650 | ||
1651 | #define set_commit_trans_id(c,val) do { (c)->j_trans_id = cpu_to_le32 (val); } while (0) | |
1652 | #define set_commit_trans_len(c,val) do { (c)->j_len = cpu_to_le32 (val); } while (0) | |
1653 | ||
1654 | /* this header block gets written whenever a transaction is considered fully flushed, and is more recent than the | |
1655 | ** last fully flushed transaction. fully flushed means all the log blocks and all the real blocks are on disk, | |
1656 | ** and this transaction does not need to be replayed. | |
1657 | */ | |
1658 | struct reiserfs_journal_header { | |
3e8962be AV |
1659 | __le32 j_last_flush_trans_id ; /* id of last fully flushed transaction */ |
1660 | __le32 j_first_unflushed_offset ; /* offset in the log of where to start replay after a crash */ | |
1661 | __le32 j_mount_id ; | |
1da177e4 LT |
1662 | /* 12 */ struct journal_params jh_journal; |
1663 | } ; | |
1664 | ||
1665 | /* biggest tunable defines are right here */ | |
1666 | #define JOURNAL_BLOCK_COUNT 8192 /* number of blocks in the journal */ | |
1667 | #define JOURNAL_TRANS_MAX_DEFAULT 1024 /* biggest possible single transaction, don't change for now (8/3/99) */ | |
1668 | #define JOURNAL_TRANS_MIN_DEFAULT 256 | |
1669 | #define JOURNAL_MAX_BATCH_DEFAULT 900 /* max blocks to batch into one transaction, don't make this any bigger than 900 */ | |
1670 | #define JOURNAL_MIN_RATIO 2 | |
1671 | #define JOURNAL_MAX_COMMIT_AGE 30 | |
1672 | #define JOURNAL_MAX_TRANS_AGE 30 | |
1673 | #define JOURNAL_PER_BALANCE_CNT (3 * (MAX_HEIGHT-2) + 9) | |
1674 | #ifdef CONFIG_QUOTA | |
1675 | #define REISERFS_QUOTA_TRANS_BLOCKS 2 /* We need to update data and inode (atime) */ | |
1676 | #define REISERFS_QUOTA_INIT_BLOCKS (DQUOT_MAX_WRITES*(JOURNAL_PER_BALANCE_CNT+2)+1) /* 1 balancing, 1 bitmap, 1 data per write + stat data update */ | |
1677 | #else | |
1678 | #define REISERFS_QUOTA_TRANS_BLOCKS 0 | |
1679 | #define REISERFS_QUOTA_INIT_BLOCKS 0 | |
1680 | #endif | |
1681 | ||
1682 | /* both of these can be as low as 1, or as high as you want. The min is the | |
1683 | ** number of 4k bitmap nodes preallocated on mount. New nodes are allocated | |
1684 | ** as needed, and released when transactions are committed. On release, if | |
1685 | ** the current number of nodes is > max, the node is freed, otherwise, | |
1686 | ** it is put on a free list for faster use later. | |
1687 | */ | |
1688 | #define REISERFS_MIN_BITMAP_NODES 10 | |
1689 | #define REISERFS_MAX_BITMAP_NODES 100 | |
1690 | ||
1691 | #define JBH_HASH_SHIFT 13 /* these are based on journal hash size of 8192 */ | |
1692 | #define JBH_HASH_MASK 8191 | |
1693 | ||
1694 | #define _jhashfn(sb,block) \ | |
1695 | (((unsigned long)sb>>L1_CACHE_SHIFT) ^ \ | |
1696 | (((block)<<(JBH_HASH_SHIFT - 6)) ^ ((block) >> 13) ^ ((block) << (JBH_HASH_SHIFT - 12)))) | |
1697 | #define journal_hash(t,sb,block) ((t)[_jhashfn((sb),(block)) & JBH_HASH_MASK]) | |
1698 | ||
1699 | // We need these to make journal.c code more readable | |
1700 | #define journal_find_get_block(s, block) __find_get_block(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize) | |
1701 | #define journal_getblk(s, block) __getblk(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize) | |
1702 | #define journal_bread(s, block) __bread(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize) | |
1703 | ||
1704 | enum reiserfs_bh_state_bits { | |
1705 | BH_JDirty = BH_PrivateStart, /* buffer is in current transaction */ | |
1706 | BH_JDirty_wait, | |
1707 | BH_JNew, /* disk block was taken off free list before | |
1708 | * being in a finished transaction, or | |
1709 | * written to disk. Can be reused immed. */ | |
1710 | BH_JPrepared, | |
1711 | BH_JRestore_dirty, | |
1712 | BH_JTest, // debugging only will go away | |
1713 | }; | |
1714 | ||
1715 | BUFFER_FNS(JDirty, journaled); | |
1716 | TAS_BUFFER_FNS(JDirty, journaled); | |
1717 | BUFFER_FNS(JDirty_wait, journal_dirty); | |
1718 | TAS_BUFFER_FNS(JDirty_wait, journal_dirty); | |
1719 | BUFFER_FNS(JNew, journal_new); | |
1720 | TAS_BUFFER_FNS(JNew, journal_new); | |
1721 | BUFFER_FNS(JPrepared, journal_prepared); | |
1722 | TAS_BUFFER_FNS(JPrepared, journal_prepared); | |
1723 | BUFFER_FNS(JRestore_dirty, journal_restore_dirty); | |
1724 | TAS_BUFFER_FNS(JRestore_dirty, journal_restore_dirty); | |
1725 | BUFFER_FNS(JTest, journal_test); | |
1726 | TAS_BUFFER_FNS(JTest, journal_test); | |
1727 | ||
1728 | /* | |
1729 | ** transaction handle which is passed around for all journal calls | |
1730 | */ | |
1731 | struct reiserfs_transaction_handle { | |
1732 | struct super_block *t_super ; /* super for this FS when journal_begin was | |
1733 | called. saves calls to reiserfs_get_super | |
1734 | also used by nested transactions to make | |
1735 | sure they are nesting on the right FS | |
1736 | _must_ be first in the handle | |
1737 | */ | |
1738 | int t_refcount; | |
1739 | int t_blocks_logged ; /* number of blocks this writer has logged */ | |
1740 | int t_blocks_allocated ; /* number of blocks this writer allocated */ | |
1741 | unsigned long t_trans_id ; /* sanity check, equals the current trans id */ | |
1742 | void *t_handle_save ; /* save existing current->journal_info */ | |
1743 | unsigned displace_new_blocks:1; /* if new block allocation occurres, that block | |
1744 | should be displaced from others */ | |
1745 | struct list_head t_list; | |
1746 | } ; | |
1747 | ||
1748 | /* used to keep track of ordered and tail writes, attached to the buffer | |
1749 | * head through b_journal_head. | |
1750 | */ | |
1751 | struct reiserfs_jh { | |
1752 | struct reiserfs_journal_list *jl; | |
1753 | struct buffer_head *bh; | |
1754 | struct list_head list; | |
1755 | }; | |
1756 | ||
1757 | void reiserfs_free_jh(struct buffer_head *bh); | |
1758 | int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh); | |
1759 | int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh); | |
1760 | int journal_mark_dirty(struct reiserfs_transaction_handle *, struct super_block *, struct buffer_head *bh) ; | |
1761 | ||
1762 | static inline int | |
1763 | reiserfs_file_data_log(struct inode *inode) { | |
1764 | if (reiserfs_data_log(inode->i_sb) || | |
1765 | (REISERFS_I(inode)->i_flags & i_data_log)) | |
1766 | return 1 ; | |
1767 | return 0 ; | |
1768 | } | |
1769 | ||
1770 | static inline int reiserfs_transaction_running(struct super_block *s) { | |
1771 | struct reiserfs_transaction_handle *th = current->journal_info ; | |
1772 | if (th && th->t_super == s) | |
1773 | return 1 ; | |
1774 | if (th && th->t_super == NULL) | |
1775 | BUG(); | |
1776 | return 0 ; | |
1777 | } | |
1778 | ||
1779 | int reiserfs_async_progress_wait(struct super_block *s); | |
1780 | ||
1781 | struct reiserfs_transaction_handle * | |
1782 | reiserfs_persistent_transaction(struct super_block *, int count); | |
1783 | int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *); | |
1784 | int reiserfs_commit_page(struct inode *inode, struct page *page, | |
1785 | unsigned from, unsigned to); | |
1786 | int reiserfs_flush_old_commits(struct super_block *); | |
1787 | int reiserfs_commit_for_inode(struct inode *) ; | |
1788 | int reiserfs_inode_needs_commit(struct inode *) ; | |
1789 | void reiserfs_update_inode_transaction(struct inode *) ; | |
1790 | void reiserfs_wait_on_write_block(struct super_block *s) ; | |
1791 | void reiserfs_block_writes(struct reiserfs_transaction_handle *th) ; | |
1792 | void reiserfs_allow_writes(struct super_block *s) ; | |
1793 | void reiserfs_check_lock_depth(struct super_block *s, char *caller) ; | |
1794 | int reiserfs_prepare_for_journal(struct super_block *, struct buffer_head *bh, int wait) ; | |
1795 | void reiserfs_restore_prepared_buffer(struct super_block *, struct buffer_head *bh) ; | |
1796 | int journal_init(struct super_block *, const char * j_dev_name, int old_format, unsigned int) ; | |
1797 | int journal_release(struct reiserfs_transaction_handle*, struct super_block *) ; | |
1798 | int journal_release_error(struct reiserfs_transaction_handle*, struct super_block *) ; | |
1799 | int journal_end(struct reiserfs_transaction_handle *, struct super_block *, unsigned long) ; | |
1800 | int journal_end_sync(struct reiserfs_transaction_handle *, struct super_block *, unsigned long) ; | |
1801 | int journal_mark_freed(struct reiserfs_transaction_handle *, struct super_block *, b_blocknr_t blocknr) ; | |
1802 | int journal_transaction_should_end(struct reiserfs_transaction_handle *, int) ; | |
1803 | int reiserfs_in_journal(struct super_block *p_s_sb, int bmap_nr, int bit_nr, int searchall, b_blocknr_t *next) ; | |
1804 | int journal_begin(struct reiserfs_transaction_handle *, struct super_block *p_s_sb, unsigned long) ; | |
1805 | int journal_join_abort(struct reiserfs_transaction_handle *, struct super_block *p_s_sb, unsigned long) ; | |
1806 | void reiserfs_journal_abort (struct super_block *sb, int errno); | |
1807 | void reiserfs_abort (struct super_block *sb, int errno, const char *fmt, ...); | |
1808 | int reiserfs_allocate_list_bitmaps(struct super_block *s, struct reiserfs_list_bitmap *, int) ; | |
1809 | ||
1810 | void add_save_link (struct reiserfs_transaction_handle * th, | |
1811 | struct inode * inode, int truncate); | |
1812 | int remove_save_link (struct inode * inode, int truncate); | |
1813 | ||
1814 | /* objectid.c */ | |
1815 | __u32 reiserfs_get_unused_objectid (struct reiserfs_transaction_handle *th); | |
1816 | void reiserfs_release_objectid (struct reiserfs_transaction_handle *th, __u32 objectid_to_release); | |
1817 | int reiserfs_convert_objectid_map_v1(struct super_block *) ; | |
1818 | ||
1819 | /* stree.c */ | |
1820 | int B_IS_IN_TREE(const struct buffer_head *); | |
1821 | extern void copy_item_head(struct item_head * p_v_to, | |
1822 | const struct item_head * p_v_from); | |
1823 | ||
1824 | // first key is in cpu form, second - le | |
1825 | extern int comp_short_keys (const struct reiserfs_key * le_key, | |
1826 | const struct cpu_key * cpu_key); | |
1827 | extern void le_key2cpu_key (struct cpu_key * to, const struct reiserfs_key * from); | |
1828 | ||
1829 | // both are in le form | |
1830 | extern int comp_le_keys (const struct reiserfs_key *, const struct reiserfs_key *); | |
1831 | extern int comp_short_le_keys (const struct reiserfs_key *, const struct reiserfs_key *); | |
1832 | ||
1833 | // | |
1834 | // get key version from on disk key - kludge | |
1835 | // | |
1836 | static inline int le_key_version (const struct reiserfs_key * key) | |
1837 | { | |
1838 | int type; | |
1839 | ||
1840 | type = offset_v2_k_type( &(key->u.k_offset_v2)); | |
1841 | if (type != TYPE_DIRECT && type != TYPE_INDIRECT && type != TYPE_DIRENTRY) | |
1842 | return KEY_FORMAT_3_5; | |
1843 | ||
1844 | return KEY_FORMAT_3_6; | |
1845 | ||
1846 | } | |
1847 | ||
1848 | ||
1849 | static inline void copy_key (struct reiserfs_key *to, const struct reiserfs_key *from) | |
1850 | { | |
1851 | memcpy (to, from, KEY_SIZE); | |
1852 | } | |
1853 | ||
1854 | ||
1855 | int comp_items (const struct item_head * stored_ih, const struct path * p_s_path); | |
1856 | const struct reiserfs_key * get_rkey (const struct path * p_s_chk_path, | |
1857 | const struct super_block * p_s_sb); | |
1858 | int search_by_key (struct super_block *, const struct cpu_key *, | |
1859 | struct path *, int); | |
1860 | #define search_item(s,key,path) search_by_key (s, key, path, DISK_LEAF_NODE_LEVEL) | |
1861 | int search_for_position_by_key (struct super_block * p_s_sb, | |
1862 | const struct cpu_key * p_s_cpu_key, | |
1863 | struct path * p_s_search_path); | |
1864 | extern void decrement_bcount (struct buffer_head * p_s_bh); | |
1865 | void decrement_counters_in_path (struct path * p_s_search_path); | |
1866 | void pathrelse (struct path * p_s_search_path); | |
1867 | int reiserfs_check_path(struct path *p) ; | |
1868 | void pathrelse_and_restore (struct super_block *s, struct path * p_s_search_path); | |
1869 | ||
1870 | int reiserfs_insert_item (struct reiserfs_transaction_handle *th, | |
1871 | struct path * path, | |
1872 | const struct cpu_key * key, | |
1873 | struct item_head * ih, | |
1874 | struct inode *inode, const char * body); | |
1875 | ||
1876 | int reiserfs_paste_into_item (struct reiserfs_transaction_handle *th, | |
1877 | struct path * path, | |
1878 | const struct cpu_key * key, | |
1879 | struct inode *inode, | |
1880 | const char * body, int paste_size); | |
1881 | ||
1882 | int reiserfs_cut_from_item (struct reiserfs_transaction_handle *th, | |
1883 | struct path * path, | |
1884 | struct cpu_key * key, | |
1885 | struct inode * inode, | |
1886 | struct page *page, | |
1887 | loff_t new_file_size); | |
1888 | ||
1889 | int reiserfs_delete_item (struct reiserfs_transaction_handle *th, | |
1890 | struct path * path, | |
1891 | const struct cpu_key * key, | |
1892 | struct inode * inode, | |
1893 | struct buffer_head * p_s_un_bh); | |
1894 | ||
1895 | void reiserfs_delete_solid_item (struct reiserfs_transaction_handle *th, | |
1896 | struct inode *inode, struct reiserfs_key * key); | |
1897 | int reiserfs_delete_object (struct reiserfs_transaction_handle *th, struct inode * p_s_inode); | |
1898 | int reiserfs_do_truncate (struct reiserfs_transaction_handle *th, | |
1899 | struct inode * p_s_inode, struct page *, | |
1900 | int update_timestamps); | |
1901 | ||
1902 | #define i_block_size(inode) ((inode)->i_sb->s_blocksize) | |
1903 | #define file_size(inode) ((inode)->i_size) | |
1904 | #define tail_size(inode) (file_size (inode) & (i_block_size (inode) - 1)) | |
1905 | ||
1906 | #define tail_has_to_be_packed(inode) (have_large_tails ((inode)->i_sb)?\ | |
1907 | !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 ) | |
1908 | ||
1909 | void padd_item (char * item, int total_length, int length); | |
1910 | ||
1911 | /* inode.c */ | |
1912 | /* args for the create parameter of reiserfs_get_block */ | |
1913 | #define GET_BLOCK_NO_CREATE 0 /* don't create new blocks or convert tails */ | |
1914 | #define GET_BLOCK_CREATE 1 /* add anything you need to find block */ | |
1915 | #define GET_BLOCK_NO_HOLE 2 /* return -ENOENT for file holes */ | |
1916 | #define GET_BLOCK_READ_DIRECT 4 /* read the tail if indirect item not found */ | |
1917 | #define GET_BLOCK_NO_ISEM 8 /* i_sem is not held, don't preallocate */ | |
1918 | #define GET_BLOCK_NO_DANGLE 16 /* don't leave any transactions running */ | |
1919 | ||
1920 | int restart_transaction(struct reiserfs_transaction_handle *th, struct inode *inode, struct path *path); | |
1921 | void reiserfs_read_locked_inode(struct inode * inode, struct reiserfs_iget_args *args) ; | |
1922 | int reiserfs_find_actor(struct inode * inode, void *p) ; | |
1923 | int reiserfs_init_locked_inode(struct inode * inode, void *p) ; | |
1924 | void reiserfs_delete_inode (struct inode * inode); | |
1925 | int reiserfs_write_inode (struct inode * inode, int) ; | |
1926 | int reiserfs_get_block (struct inode * inode, sector_t block, struct buffer_head * bh_result, int create); | |
1927 | struct dentry *reiserfs_get_dentry(struct super_block *, void *) ; | |
1928 | struct dentry *reiserfs_decode_fh(struct super_block *sb, __u32 *data, | |
1929 | int len, int fhtype, | |
1930 | int (*acceptable)(void *contect, struct dentry *de), | |
1931 | void *context) ; | |
1932 | int reiserfs_encode_fh( struct dentry *dentry, __u32 *data, int *lenp, | |
1933 | int connectable ); | |
1934 | ||
1935 | int reiserfs_truncate_file(struct inode *, int update_timestamps) ; | |
1936 | void make_cpu_key (struct cpu_key * cpu_key, struct inode * inode, loff_t offset, | |
1937 | int type, int key_length); | |
1938 | void make_le_item_head (struct item_head * ih, const struct cpu_key * key, | |
1939 | int version, | |
1940 | loff_t offset, int type, int length, int entry_count); | |
1941 | struct inode * reiserfs_iget (struct super_block * s, | |
1942 | const struct cpu_key * key); | |
1943 | ||
1944 | ||
1945 | int reiserfs_new_inode (struct reiserfs_transaction_handle *th, | |
1946 | struct inode * dir, int mode, | |
1947 | const char * symname, loff_t i_size, | |
1948 | struct dentry *dentry, struct inode *inode); | |
1949 | ||
1950 | void reiserfs_update_sd_size (struct reiserfs_transaction_handle *th, | |
1951 | struct inode * inode, loff_t size); | |
1952 | ||
1953 | static inline void reiserfs_update_sd(struct reiserfs_transaction_handle *th, | |
1954 | struct inode *inode) | |
1955 | { | |
1956 | reiserfs_update_sd_size(th, inode, inode->i_size) ; | |
1957 | } | |
1958 | ||
1959 | void sd_attrs_to_i_attrs( __u16 sd_attrs, struct inode *inode ); | |
1960 | void i_attrs_to_sd_attrs( struct inode *inode, __u16 *sd_attrs ); | |
1961 | int reiserfs_setattr(struct dentry *dentry, struct iattr *attr); | |
1962 | ||
1963 | /* namei.c */ | |
1964 | void set_de_name_and_namelen (struct reiserfs_dir_entry * de); | |
1965 | int search_by_entry_key (struct super_block * sb, const struct cpu_key * key, | |
1966 | struct path * path, | |
1967 | struct reiserfs_dir_entry * de); | |
1968 | struct dentry *reiserfs_get_parent(struct dentry *) ; | |
1969 | /* procfs.c */ | |
1970 | ||
1971 | #if defined( CONFIG_PROC_FS ) && defined( CONFIG_REISERFS_PROC_INFO ) | |
1972 | #define REISERFS_PROC_INFO | |
1973 | #else | |
1974 | #undef REISERFS_PROC_INFO | |
1975 | #endif | |
1976 | ||
1977 | int reiserfs_proc_info_init( struct super_block *sb ); | |
1978 | int reiserfs_proc_info_done( struct super_block *sb ); | |
1979 | struct proc_dir_entry *reiserfs_proc_register_global( char *name, | |
1980 | read_proc_t *func ); | |
1981 | void reiserfs_proc_unregister_global( const char *name ); | |
1982 | int reiserfs_proc_info_global_init( void ); | |
1983 | int reiserfs_proc_info_global_done( void ); | |
1984 | int reiserfs_global_version_in_proc( char *buffer, char **start, off_t offset, | |
1985 | int count, int *eof, void *data ); | |
1986 | ||
1987 | #if defined( REISERFS_PROC_INFO ) | |
1988 | ||
1989 | #define PROC_EXP( e ) e | |
1990 | ||
1991 | #define __PINFO( sb ) REISERFS_SB(sb) -> s_proc_info_data | |
1992 | #define PROC_INFO_MAX( sb, field, value ) \ | |
1993 | __PINFO( sb ).field = \ | |
1994 | max( REISERFS_SB( sb ) -> s_proc_info_data.field, value ) | |
1995 | #define PROC_INFO_INC( sb, field ) ( ++ ( __PINFO( sb ).field ) ) | |
1996 | #define PROC_INFO_ADD( sb, field, val ) ( __PINFO( sb ).field += ( val ) ) | |
1997 | #define PROC_INFO_BH_STAT( sb, bh, level ) \ | |
1998 | PROC_INFO_INC( sb, sbk_read_at[ ( level ) ] ); \ | |
1999 | PROC_INFO_ADD( sb, free_at[ ( level ) ], B_FREE_SPACE( bh ) ); \ | |
2000 | PROC_INFO_ADD( sb, items_at[ ( level ) ], B_NR_ITEMS( bh ) ) | |
2001 | #else | |
2002 | #define PROC_EXP( e ) | |
2003 | #define VOID_V ( ( void ) 0 ) | |
2004 | #define PROC_INFO_MAX( sb, field, value ) VOID_V | |
2005 | #define PROC_INFO_INC( sb, field ) VOID_V | |
2006 | #define PROC_INFO_ADD( sb, field, val ) VOID_V | |
2007 | #define PROC_INFO_BH_STAT( p_s_sb, p_s_bh, n_node_level ) VOID_V | |
2008 | #endif | |
2009 | ||
2010 | /* dir.c */ | |
2011 | extern struct inode_operations reiserfs_dir_inode_operations; | |
2012 | extern struct inode_operations reiserfs_symlink_inode_operations; | |
2013 | extern struct inode_operations reiserfs_special_inode_operations; | |
2014 | extern struct file_operations reiserfs_dir_operations; | |
2015 | ||
2016 | /* tail_conversion.c */ | |
2017 | int direct2indirect (struct reiserfs_transaction_handle *, struct inode *, struct path *, struct buffer_head *, loff_t); | |
2018 | int indirect2direct (struct reiserfs_transaction_handle *, struct inode *, struct page *, struct path *, const struct cpu_key *, loff_t, char *); | |
2019 | void reiserfs_unmap_buffer(struct buffer_head *) ; | |
2020 | ||
2021 | ||
2022 | /* file.c */ | |
2023 | extern struct inode_operations reiserfs_file_inode_operations; | |
2024 | extern struct file_operations reiserfs_file_operations; | |
2025 | extern struct address_space_operations reiserfs_address_space_operations ; | |
2026 | ||
2027 | /* fix_nodes.c */ | |
2028 | #ifdef CONFIG_REISERFS_CHECK | |
2029 | void * reiserfs_kmalloc (size_t size, int flags, struct super_block * s); | |
2030 | void reiserfs_kfree (const void * vp, size_t size, struct super_block * s); | |
2031 | #else | |
2032 | static inline void *reiserfs_kmalloc(size_t size, int flags, | |
2033 | struct super_block *s) | |
2034 | { | |
2035 | return kmalloc(size, flags); | |
2036 | } | |
2037 | ||
2038 | static inline void reiserfs_kfree(const void *vp, size_t size, | |
2039 | struct super_block *s) | |
2040 | { | |
2041 | kfree(vp); | |
2042 | } | |
2043 | #endif | |
2044 | ||
2045 | int fix_nodes (int n_op_mode, struct tree_balance * p_s_tb, | |
2046 | struct item_head * p_s_ins_ih, const void *); | |
2047 | void unfix_nodes (struct tree_balance *); | |
2048 | ||
2049 | ||
2050 | /* prints.c */ | |
2051 | void reiserfs_panic (struct super_block * s, const char * fmt, ...) __attribute__ ( ( noreturn ) ); | |
2052 | void reiserfs_info (struct super_block *s, const char * fmt, ...); | |
2053 | void reiserfs_debug (struct super_block *s, int level, const char * fmt, ...); | |
2054 | void print_indirect_item (struct buffer_head * bh, int item_num); | |
2055 | void store_print_tb (struct tree_balance * tb); | |
2056 | void print_cur_tb (char * mes); | |
2057 | void print_de (struct reiserfs_dir_entry * de); | |
2058 | void print_bi (struct buffer_info * bi, char * mes); | |
2059 | #define PRINT_LEAF_ITEMS 1 /* print all items */ | |
2060 | #define PRINT_DIRECTORY_ITEMS 2 /* print directory items */ | |
2061 | #define PRINT_DIRECT_ITEMS 4 /* print contents of direct items */ | |
2062 | void print_block (struct buffer_head * bh, ...); | |
2063 | void print_bmap (struct super_block * s, int silent); | |
2064 | void print_bmap_block (int i, char * data, int size, int silent); | |
2065 | /*void print_super_block (struct super_block * s, char * mes);*/ | |
2066 | void print_objectid_map (struct super_block * s); | |
2067 | void print_block_head (struct buffer_head * bh, char * mes); | |
2068 | void check_leaf (struct buffer_head * bh); | |
2069 | void check_internal (struct buffer_head * bh); | |
2070 | void print_statistics (struct super_block * s); | |
2071 | char * reiserfs_hashname(int code); | |
2072 | ||
2073 | /* lbalance.c */ | |
2074 | int leaf_move_items (int shift_mode, struct tree_balance * tb, int mov_num, int mov_bytes, struct buffer_head * Snew); | |
2075 | int leaf_shift_left (struct tree_balance * tb, int shift_num, int shift_bytes); | |
2076 | int leaf_shift_right (struct tree_balance * tb, int shift_num, int shift_bytes); | |
2077 | void leaf_delete_items (struct buffer_info * cur_bi, int last_first, int first, int del_num, int del_bytes); | |
2078 | void leaf_insert_into_buf (struct buffer_info * bi, int before, | |
2079 | struct item_head * inserted_item_ih, const char * inserted_item_body, int zeros_number); | |
2080 | void leaf_paste_in_buffer (struct buffer_info * bi, int pasted_item_num, | |
2081 | int pos_in_item, int paste_size, const char * body, int zeros_number); | |
2082 | void leaf_cut_from_buffer (struct buffer_info * bi, int cut_item_num, int pos_in_item, | |
2083 | int cut_size); | |
2084 | void leaf_paste_entries (struct buffer_head * bh, int item_num, int before, | |
2085 | int new_entry_count, struct reiserfs_de_head * new_dehs, const char * records, int paste_size); | |
2086 | /* ibalance.c */ | |
2087 | int balance_internal (struct tree_balance * , int, int, struct item_head * , | |
2088 | struct buffer_head **); | |
2089 | ||
2090 | /* do_balance.c */ | |
2091 | void do_balance_mark_leaf_dirty (struct tree_balance * tb, | |
2092 | struct buffer_head * bh, int flag); | |
2093 | #define do_balance_mark_internal_dirty do_balance_mark_leaf_dirty | |
2094 | #define do_balance_mark_sb_dirty do_balance_mark_leaf_dirty | |
2095 | ||
2096 | void do_balance (struct tree_balance * tb, struct item_head * ih, | |
2097 | const char * body, int flag); | |
2098 | void reiserfs_invalidate_buffer (struct tree_balance * tb, struct buffer_head * bh); | |
2099 | ||
2100 | int get_left_neighbor_position (struct tree_balance * tb, int h); | |
2101 | int get_right_neighbor_position (struct tree_balance * tb, int h); | |
2102 | void replace_key (struct tree_balance * tb, struct buffer_head *, int, struct buffer_head *, int); | |
2103 | void make_empty_node (struct buffer_info *); | |
2104 | struct buffer_head * get_FEB (struct tree_balance *); | |
2105 | ||
2106 | /* bitmap.c */ | |
2107 | ||
2108 | /* structure contains hints for block allocator, and it is a container for | |
2109 | * arguments, such as node, search path, transaction_handle, etc. */ | |
2110 | struct __reiserfs_blocknr_hint { | |
2111 | struct inode * inode; /* inode passed to allocator, if we allocate unf. nodes */ | |
2112 | long block; /* file offset, in blocks */ | |
6a3a16f2 | 2113 | struct in_core_key key; |
1da177e4 LT |
2114 | struct path * path; /* search path, used by allocator to deternine search_start by |
2115 | * various ways */ | |
2116 | struct reiserfs_transaction_handle * th; /* transaction handle is needed to log super blocks and | |
2117 | * bitmap blocks changes */ | |
2118 | b_blocknr_t beg, end; | |
2119 | b_blocknr_t search_start; /* a field used to transfer search start value (block number) | |
2120 | * between different block allocator procedures | |
2121 | * (determine_search_start() and others) */ | |
2122 | int prealloc_size; /* is set in determine_prealloc_size() function, used by underlayed | |
2123 | * function that do actual allocation */ | |
2124 | ||
2125 | unsigned formatted_node:1; /* the allocator uses different polices for getting disk space for | |
2126 | * formatted/unformatted blocks with/without preallocation */ | |
2127 | unsigned preallocate:1; | |
2128 | }; | |
2129 | ||
2130 | typedef struct __reiserfs_blocknr_hint reiserfs_blocknr_hint_t; | |
2131 | ||
2132 | int reiserfs_parse_alloc_options (struct super_block *, char *); | |
2133 | void reiserfs_init_alloc_options (struct super_block *s); | |
2134 | ||
2135 | /* | |
2136 | * given a directory, this will tell you what packing locality | |
2137 | * to use for a new object underneat it. The locality is returned | |
2138 | * in disk byte order (le). | |
2139 | */ | |
3e8962be | 2140 | __le32 reiserfs_choose_packing(struct inode *dir); |
1da177e4 LT |
2141 | |
2142 | int is_reusable (struct super_block * s, b_blocknr_t block, int bit_value); | |
2143 | void reiserfs_free_block (struct reiserfs_transaction_handle *th, struct inode *, b_blocknr_t, int for_unformatted); | |
2144 | int reiserfs_allocate_blocknrs(reiserfs_blocknr_hint_t *, b_blocknr_t * , int, int); | |
2145 | extern inline int reiserfs_new_form_blocknrs (struct tree_balance * tb, | |
2146 | b_blocknr_t *new_blocknrs, int amount_needed) | |
2147 | { | |
2148 | reiserfs_blocknr_hint_t hint = { | |
2149 | .th = tb->transaction_handle, | |
2150 | .path = tb->tb_path, | |
2151 | .inode = NULL, | |
2152 | .key = tb->key, | |
2153 | .block = 0, | |
2154 | .formatted_node = 1 | |
2155 | }; | |
2156 | return reiserfs_allocate_blocknrs(&hint, new_blocknrs, amount_needed, 0); | |
2157 | } | |
2158 | ||
2159 | extern inline int reiserfs_new_unf_blocknrs (struct reiserfs_transaction_handle *th, | |
2160 | struct inode *inode, | |
2161 | b_blocknr_t *new_blocknrs, | |
2162 | struct path * path, long block) | |
2163 | { | |
2164 | reiserfs_blocknr_hint_t hint = { | |
2165 | .th = th, | |
2166 | .path = path, | |
2167 | .inode = inode, | |
2168 | .block = block, | |
2169 | .formatted_node = 0, | |
2170 | .preallocate = 0 | |
2171 | }; | |
2172 | return reiserfs_allocate_blocknrs(&hint, new_blocknrs, 1, 0); | |
2173 | } | |
2174 | ||
2175 | #ifdef REISERFS_PREALLOCATE | |
2176 | extern inline int reiserfs_new_unf_blocknrs2(struct reiserfs_transaction_handle *th, | |
2177 | struct inode * inode, | |
2178 | b_blocknr_t *new_blocknrs, | |
2179 | struct path * path, long block) | |
2180 | { | |
2181 | reiserfs_blocknr_hint_t hint = { | |
2182 | .th = th, | |
2183 | .path = path, | |
2184 | .inode = inode, | |
2185 | .block = block, | |
2186 | .formatted_node = 0, | |
2187 | .preallocate = 1 | |
2188 | }; | |
2189 | return reiserfs_allocate_blocknrs(&hint, new_blocknrs, 1, 0); | |
2190 | } | |
2191 | ||
2192 | void reiserfs_discard_prealloc (struct reiserfs_transaction_handle *th, | |
2193 | struct inode * inode); | |
2194 | void reiserfs_discard_all_prealloc (struct reiserfs_transaction_handle *th); | |
2195 | #endif | |
2196 | void reiserfs_claim_blocks_to_be_allocated( struct super_block *sb, int blocks); | |
2197 | void reiserfs_release_claimed_blocks( struct super_block *sb, int blocks); | |
2198 | int reiserfs_can_fit_pages(struct super_block *sb); | |
2199 | ||
2200 | /* hashes.c */ | |
2201 | __u32 keyed_hash (const signed char *msg, int len); | |
2202 | __u32 yura_hash (const signed char *msg, int len); | |
2203 | __u32 r5_hash (const signed char *msg, int len); | |
2204 | ||
2205 | /* the ext2 bit routines adjust for big or little endian as | |
2206 | ** appropriate for the arch, so in our laziness we use them rather | |
2207 | ** than using the bit routines they call more directly. These | |
2208 | ** routines must be used when changing on disk bitmaps. */ | |
2209 | #define reiserfs_test_and_set_le_bit ext2_set_bit | |
2210 | #define reiserfs_test_and_clear_le_bit ext2_clear_bit | |
2211 | #define reiserfs_test_le_bit ext2_test_bit | |
2212 | #define reiserfs_find_next_zero_le_bit ext2_find_next_zero_bit | |
2213 | ||
2214 | /* sometimes reiserfs_truncate may require to allocate few new blocks | |
2215 | to perform indirect2direct conversion. People probably used to | |
2216 | think, that truncate should work without problems on a filesystem | |
2217 | without free disk space. They may complain that they can not | |
2218 | truncate due to lack of free disk space. This spare space allows us | |
2219 | to not worry about it. 500 is probably too much, but it should be | |
2220 | absolutely safe */ | |
2221 | #define SPARE_SPACE 500 | |
2222 | ||
2223 | ||
2224 | /* prototypes from ioctl.c */ | |
2225 | int reiserfs_ioctl (struct inode * inode, struct file * filp, | |
2226 | unsigned int cmd, unsigned long arg); | |
2227 | ||
2228 | /* ioctl's command */ | |
2229 | #define REISERFS_IOC_UNPACK _IOW(0xCD,1,long) | |
2230 | /* define following flags to be the same as in ext2, so that chattr(1), | |
2231 | lsattr(1) will work with us. */ | |
2232 | #define REISERFS_IOC_GETFLAGS EXT2_IOC_GETFLAGS | |
2233 | #define REISERFS_IOC_SETFLAGS EXT2_IOC_SETFLAGS | |
2234 | #define REISERFS_IOC_GETVERSION EXT2_IOC_GETVERSION | |
2235 | #define REISERFS_IOC_SETVERSION EXT2_IOC_SETVERSION | |
2236 | ||
2237 | /* Locking primitives */ | |
2238 | /* Right now we are still falling back to (un)lock_kernel, but eventually that | |
2239 | would evolve into real per-fs locks */ | |
2240 | #define reiserfs_write_lock( sb ) lock_kernel() | |
2241 | #define reiserfs_write_unlock( sb ) unlock_kernel() | |
2242 | ||
2243 | /* xattr stuff */ | |
2244 | #define REISERFS_XATTR_DIR_SEM(s) (REISERFS_SB(s)->xattr_dir_sem) | |
2245 | ||
2246 | #endif /* _LINUX_REISER_FS_H */ | |
2247 | ||
2248 |