Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README | |
3 | */ | |
4 | ||
5 | /* | |
6 | * Written by Anatoly P. Pinchuk pap@namesys.botik.ru | |
7 | * Programm System Institute | |
8 | * Pereslavl-Zalessky Russia | |
9 | */ | |
10 | ||
11 | /* | |
12 | * This file contains functions dealing with S+tree | |
13 | * | |
14 | * B_IS_IN_TREE | |
15 | * copy_item_head | |
16 | * comp_short_keys | |
17 | * comp_keys | |
18 | * comp_short_le_keys | |
19 | * le_key2cpu_key | |
20 | * comp_le_keys | |
21 | * bin_search | |
22 | * get_lkey | |
23 | * get_rkey | |
24 | * key_in_buffer | |
25 | * decrement_bcount | |
1da177e4 LT |
26 | * reiserfs_check_path |
27 | * pathrelse_and_restore | |
28 | * pathrelse | |
29 | * search_by_key_reada | |
30 | * search_by_key | |
31 | * search_for_position_by_key | |
32 | * comp_items | |
33 | * prepare_for_direct_item | |
34 | * prepare_for_direntry_item | |
35 | * prepare_for_delete_or_cut | |
36 | * calc_deleted_bytes_number | |
37 | * init_tb_struct | |
38 | * padd_item | |
39 | * reiserfs_delete_item | |
40 | * reiserfs_delete_solid_item | |
41 | * reiserfs_delete_object | |
42 | * maybe_indirect_to_direct | |
43 | * indirect_to_direct_roll_back | |
44 | * reiserfs_cut_from_item | |
45 | * truncate_directory | |
46 | * reiserfs_do_truncate | |
47 | * reiserfs_paste_into_item | |
48 | * reiserfs_insert_item | |
49 | */ | |
50 | ||
1da177e4 LT |
51 | #include <linux/time.h> |
52 | #include <linux/string.h> | |
53 | #include <linux/pagemap.h> | |
54 | #include <linux/reiserfs_fs.h> | |
1da177e4 LT |
55 | #include <linux/buffer_head.h> |
56 | #include <linux/quotaops.h> | |
57 | ||
58 | /* Does the buffer contain a disk block which is in the tree. */ | |
ad31a4fc | 59 | inline int B_IS_IN_TREE(const struct buffer_head *bh) |
1da177e4 LT |
60 | { |
61 | ||
ad31a4fc JM |
62 | RFALSE(B_LEVEL(bh) > MAX_HEIGHT, |
63 | "PAP-1010: block (%b) has too big level (%z)", bh, bh); | |
1da177e4 | 64 | |
ad31a4fc | 65 | return (B_LEVEL(bh) != FREE_LEVEL); |
1da177e4 LT |
66 | } |
67 | ||
68 | // | |
69 | // to gets item head in le form | |
70 | // | |
d68caa95 JM |
71 | inline void copy_item_head(struct item_head *to, |
72 | const struct item_head *from) | |
1da177e4 | 73 | { |
d68caa95 | 74 | memcpy(to, from, IH_SIZE); |
1da177e4 LT |
75 | } |
76 | ||
1da177e4 LT |
77 | /* k1 is pointer to on-disk structure which is stored in little-endian |
78 | form. k2 is pointer to cpu variable. For key of items of the same | |
79 | object this returns 0. | |
0222e657 | 80 | Returns: -1 if key1 < key2 |
1da177e4 LT |
81 | 0 if key1 == key2 |
82 | 1 if key1 > key2 */ | |
bd4c625c LT |
83 | inline int comp_short_keys(const struct reiserfs_key *le_key, |
84 | const struct cpu_key *cpu_key) | |
1da177e4 | 85 | { |
bd4c625c LT |
86 | __u32 n; |
87 | n = le32_to_cpu(le_key->k_dir_id); | |
88 | if (n < cpu_key->on_disk_key.k_dir_id) | |
89 | return -1; | |
90 | if (n > cpu_key->on_disk_key.k_dir_id) | |
91 | return 1; | |
92 | n = le32_to_cpu(le_key->k_objectid); | |
93 | if (n < cpu_key->on_disk_key.k_objectid) | |
94 | return -1; | |
95 | if (n > cpu_key->on_disk_key.k_objectid) | |
96 | return 1; | |
97 | return 0; | |
1da177e4 LT |
98 | } |
99 | ||
1da177e4 LT |
100 | /* k1 is pointer to on-disk structure which is stored in little-endian |
101 | form. k2 is pointer to cpu variable. | |
102 | Compare keys using all 4 key fields. | |
103 | Returns: -1 if key1 < key2 0 | |
104 | if key1 = key2 1 if key1 > key2 */ | |
bd4c625c LT |
105 | static inline int comp_keys(const struct reiserfs_key *le_key, |
106 | const struct cpu_key *cpu_key) | |
1da177e4 | 107 | { |
bd4c625c LT |
108 | int retval; |
109 | ||
110 | retval = comp_short_keys(le_key, cpu_key); | |
111 | if (retval) | |
112 | return retval; | |
113 | if (le_key_k_offset(le_key_version(le_key), le_key) < | |
114 | cpu_key_k_offset(cpu_key)) | |
115 | return -1; | |
116 | if (le_key_k_offset(le_key_version(le_key), le_key) > | |
117 | cpu_key_k_offset(cpu_key)) | |
118 | return 1; | |
119 | ||
120 | if (cpu_key->key_length == 3) | |
121 | return 0; | |
122 | ||
123 | /* this part is needed only when tail conversion is in progress */ | |
124 | if (le_key_k_type(le_key_version(le_key), le_key) < | |
125 | cpu_key_k_type(cpu_key)) | |
126 | return -1; | |
127 | ||
128 | if (le_key_k_type(le_key_version(le_key), le_key) > | |
129 | cpu_key_k_type(cpu_key)) | |
130 | return 1; | |
1da177e4 | 131 | |
bd4c625c | 132 | return 0; |
1da177e4 LT |
133 | } |
134 | ||
bd4c625c LT |
135 | inline int comp_short_le_keys(const struct reiserfs_key *key1, |
136 | const struct reiserfs_key *key2) | |
1da177e4 | 137 | { |
d68caa95 | 138 | __u32 *k1_u32, *k2_u32; |
ee93961b | 139 | int key_length = REISERFS_SHORT_KEY_LEN; |
bd4c625c | 140 | |
d68caa95 JM |
141 | k1_u32 = (__u32 *) key1; |
142 | k2_u32 = (__u32 *) key2; | |
ee93961b | 143 | for (; key_length--; ++k1_u32, ++k2_u32) { |
d68caa95 | 144 | if (le32_to_cpu(*k1_u32) < le32_to_cpu(*k2_u32)) |
bd4c625c | 145 | return -1; |
d68caa95 | 146 | if (le32_to_cpu(*k1_u32) > le32_to_cpu(*k2_u32)) |
bd4c625c LT |
147 | return 1; |
148 | } | |
149 | return 0; | |
1da177e4 LT |
150 | } |
151 | ||
bd4c625c | 152 | inline void le_key2cpu_key(struct cpu_key *to, const struct reiserfs_key *from) |
1da177e4 | 153 | { |
bd4c625c LT |
154 | int version; |
155 | to->on_disk_key.k_dir_id = le32_to_cpu(from->k_dir_id); | |
156 | to->on_disk_key.k_objectid = le32_to_cpu(from->k_objectid); | |
157 | ||
158 | // find out version of the key | |
159 | version = le_key_version(from); | |
160 | to->version = version; | |
161 | to->on_disk_key.k_offset = le_key_k_offset(version, from); | |
162 | to->on_disk_key.k_type = le_key_k_type(version, from); | |
1da177e4 LT |
163 | } |
164 | ||
1da177e4 LT |
165 | // this does not say which one is bigger, it only returns 1 if keys |
166 | // are not equal, 0 otherwise | |
bd4c625c LT |
167 | inline int comp_le_keys(const struct reiserfs_key *k1, |
168 | const struct reiserfs_key *k2) | |
1da177e4 | 169 | { |
bd4c625c | 170 | return memcmp(k1, k2, sizeof(struct reiserfs_key)); |
1da177e4 LT |
171 | } |
172 | ||
173 | /************************************************************************** | |
174 | * Binary search toolkit function * | |
175 | * Search for an item in the array by the item key * | |
176 | * Returns: 1 if found, 0 if not found; * | |
d68caa95 JM |
177 | * *pos = number of the searched element if found, else the * |
178 | * number of the first element that is larger than key. * | |
1da177e4 | 179 | **************************************************************************/ |
ee93961b JM |
180 | /* For those not familiar with binary search: lbound is the leftmost item that it |
181 | could be, rbound the rightmost item that it could be. We examine the item | |
182 | halfway between lbound and rbound, and that tells us either that we can increase | |
183 | lbound, or decrease rbound, or that we have found it, or if lbound <= rbound that | |
1da177e4 LT |
184 | there are no possible items, and we have not found it. With each examination we |
185 | cut the number of possible items it could be by one more than half rounded down, | |
186 | or we find it. */ | |
d68caa95 JM |
187 | static inline int bin_search(const void *key, /* Key to search for. */ |
188 | const void *base, /* First item in the array. */ | |
189 | int num, /* Number of items in the array. */ | |
190 | int width, /* Item size in the array. | |
191 | searched. Lest the reader be | |
192 | confused, note that this is crafted | |
193 | as a general function, and when it | |
194 | is applied specifically to the array | |
195 | of item headers in a node, width | |
196 | is actually the item header size not | |
197 | the item size. */ | |
198 | int *pos /* Number of the searched for element. */ | |
bd4c625c LT |
199 | ) |
200 | { | |
ee93961b | 201 | int rbound, lbound, j; |
bd4c625c | 202 | |
ee93961b JM |
203 | for (j = ((rbound = num - 1) + (lbound = 0)) / 2; |
204 | lbound <= rbound; j = (rbound + lbound) / 2) | |
bd4c625c | 205 | switch (comp_keys |
ee93961b | 206 | ((struct reiserfs_key *)((char *)base + j * width), |
d68caa95 | 207 | (struct cpu_key *)key)) { |
bd4c625c | 208 | case -1: |
ee93961b | 209 | lbound = j + 1; |
bd4c625c LT |
210 | continue; |
211 | case 1: | |
ee93961b | 212 | rbound = j - 1; |
bd4c625c LT |
213 | continue; |
214 | case 0: | |
ee93961b | 215 | *pos = j; |
bd4c625c LT |
216 | return ITEM_FOUND; /* Key found in the array. */ |
217 | } | |
218 | ||
219 | /* bin_search did not find given key, it returns position of key, | |
220 | that is minimal and greater than the given one. */ | |
ee93961b | 221 | *pos = lbound; |
bd4c625c | 222 | return ITEM_NOT_FOUND; |
1da177e4 LT |
223 | } |
224 | ||
225 | #ifdef CONFIG_REISERFS_CHECK | |
bd4c625c | 226 | extern struct tree_balance *cur_tb; |
1da177e4 LT |
227 | #endif |
228 | ||
1da177e4 | 229 | /* Minimal possible key. It is never in the tree. */ |
bd4c625c | 230 | const struct reiserfs_key MIN_KEY = { 0, 0, {{0, 0},} }; |
1da177e4 LT |
231 | |
232 | /* Maximal possible key. It is never in the tree. */ | |
bd4c625c | 233 | static const struct reiserfs_key MAX_KEY = { |
3e8962be AV |
234 | __constant_cpu_to_le32(0xffffffff), |
235 | __constant_cpu_to_le32(0xffffffff), | |
236 | {{__constant_cpu_to_le32(0xffffffff), | |
bd4c625c | 237 | __constant_cpu_to_le32(0xffffffff)},} |
3e8962be | 238 | }; |
1da177e4 | 239 | |
1da177e4 LT |
240 | /* Get delimiting key of the buffer by looking for it in the buffers in the path, starting from the bottom |
241 | of the path, and going upwards. We must check the path's validity at each step. If the key is not in | |
242 | the path, there is no delimiting key in the tree (buffer is first or last buffer in tree), and in this | |
243 | case we return a special key, either MIN_KEY or MAX_KEY. */ | |
ee93961b JM |
244 | static inline const struct reiserfs_key *get_lkey(const struct treepath *chk_path, |
245 | const struct super_block *sb) | |
bd4c625c | 246 | { |
ee93961b | 247 | int position, path_offset = chk_path->path_length; |
d68caa95 | 248 | struct buffer_head *parent; |
bd4c625c | 249 | |
ee93961b | 250 | RFALSE(path_offset < FIRST_PATH_ELEMENT_OFFSET, |
bd4c625c LT |
251 | "PAP-5010: invalid offset in the path"); |
252 | ||
253 | /* While not higher in path than first element. */ | |
ee93961b | 254 | while (path_offset-- > FIRST_PATH_ELEMENT_OFFSET) { |
bd4c625c LT |
255 | |
256 | RFALSE(!buffer_uptodate | |
ee93961b | 257 | (PATH_OFFSET_PBUFFER(chk_path, path_offset)), |
bd4c625c LT |
258 | "PAP-5020: parent is not uptodate"); |
259 | ||
260 | /* Parent at the path is not in the tree now. */ | |
261 | if (!B_IS_IN_TREE | |
d68caa95 | 262 | (parent = |
ee93961b | 263 | PATH_OFFSET_PBUFFER(chk_path, path_offset))) |
bd4c625c LT |
264 | return &MAX_KEY; |
265 | /* Check whether position in the parent is correct. */ | |
ee93961b | 266 | if ((position = |
d68caa95 | 267 | PATH_OFFSET_POSITION(chk_path, |
ee93961b | 268 | path_offset)) > |
d68caa95 | 269 | B_NR_ITEMS(parent)) |
bd4c625c LT |
270 | return &MAX_KEY; |
271 | /* Check whether parent at the path really points to the child. */ | |
ee93961b | 272 | if (B_N_CHILD_NUM(parent, position) != |
d68caa95 | 273 | PATH_OFFSET_PBUFFER(chk_path, |
ee93961b | 274 | path_offset + 1)->b_blocknr) |
bd4c625c LT |
275 | return &MAX_KEY; |
276 | /* Return delimiting key if position in the parent is not equal to zero. */ | |
ee93961b JM |
277 | if (position) |
278 | return B_N_PDELIM_KEY(parent, position - 1); | |
bd4c625c LT |
279 | } |
280 | /* Return MIN_KEY if we are in the root of the buffer tree. */ | |
d68caa95 | 281 | if (PATH_OFFSET_PBUFFER(chk_path, FIRST_PATH_ELEMENT_OFFSET)-> |
a9dd3643 | 282 | b_blocknr == SB_ROOT_BLOCK(sb)) |
bd4c625c LT |
283 | return &MIN_KEY; |
284 | return &MAX_KEY; | |
1da177e4 LT |
285 | } |
286 | ||
1da177e4 | 287 | /* Get delimiting key of the buffer at the path and its right neighbor. */ |
d68caa95 | 288 | inline const struct reiserfs_key *get_rkey(const struct treepath *chk_path, |
a9dd3643 | 289 | const struct super_block *sb) |
bd4c625c | 290 | { |
ee93961b | 291 | int position, path_offset = chk_path->path_length; |
d68caa95 | 292 | struct buffer_head *parent; |
bd4c625c | 293 | |
ee93961b | 294 | RFALSE(path_offset < FIRST_PATH_ELEMENT_OFFSET, |
bd4c625c LT |
295 | "PAP-5030: invalid offset in the path"); |
296 | ||
ee93961b | 297 | while (path_offset-- > FIRST_PATH_ELEMENT_OFFSET) { |
bd4c625c LT |
298 | |
299 | RFALSE(!buffer_uptodate | |
ee93961b | 300 | (PATH_OFFSET_PBUFFER(chk_path, path_offset)), |
bd4c625c LT |
301 | "PAP-5040: parent is not uptodate"); |
302 | ||
303 | /* Parent at the path is not in the tree now. */ | |
304 | if (!B_IS_IN_TREE | |
d68caa95 | 305 | (parent = |
ee93961b | 306 | PATH_OFFSET_PBUFFER(chk_path, path_offset))) |
bd4c625c LT |
307 | return &MIN_KEY; |
308 | /* Check whether position in the parent is correct. */ | |
ee93961b | 309 | if ((position = |
d68caa95 | 310 | PATH_OFFSET_POSITION(chk_path, |
ee93961b | 311 | path_offset)) > |
d68caa95 | 312 | B_NR_ITEMS(parent)) |
bd4c625c LT |
313 | return &MIN_KEY; |
314 | /* Check whether parent at the path really points to the child. */ | |
ee93961b | 315 | if (B_N_CHILD_NUM(parent, position) != |
d68caa95 | 316 | PATH_OFFSET_PBUFFER(chk_path, |
ee93961b | 317 | path_offset + 1)->b_blocknr) |
bd4c625c LT |
318 | return &MIN_KEY; |
319 | /* Return delimiting key if position in the parent is not the last one. */ | |
ee93961b JM |
320 | if (position != B_NR_ITEMS(parent)) |
321 | return B_N_PDELIM_KEY(parent, position); | |
bd4c625c LT |
322 | } |
323 | /* Return MAX_KEY if we are in the root of the buffer tree. */ | |
d68caa95 | 324 | if (PATH_OFFSET_PBUFFER(chk_path, FIRST_PATH_ELEMENT_OFFSET)-> |
a9dd3643 | 325 | b_blocknr == SB_ROOT_BLOCK(sb)) |
bd4c625c LT |
326 | return &MAX_KEY; |
327 | return &MIN_KEY; | |
1da177e4 LT |
328 | } |
329 | ||
1da177e4 LT |
330 | /* Check whether a key is contained in the tree rooted from a buffer at a path. */ |
331 | /* This works by looking at the left and right delimiting keys for the buffer in the last path_element in | |
332 | the path. These delimiting keys are stored at least one level above that buffer in the tree. If the | |
333 | buffer is the first or last node in the tree order then one of the delimiting keys may be absent, and in | |
334 | this case get_lkey and get_rkey return a special key which is MIN_KEY or MAX_KEY. */ | |
d68caa95 JM |
335 | static inline int key_in_buffer(struct treepath *chk_path, /* Path which should be checked. */ |
336 | const struct cpu_key *key, /* Key which should be checked. */ | |
337 | struct super_block *sb | |
bd4c625c LT |
338 | ) |
339 | { | |
1da177e4 | 340 | |
d68caa95 JM |
341 | RFALSE(!key || chk_path->path_length < FIRST_PATH_ELEMENT_OFFSET |
342 | || chk_path->path_length > MAX_HEIGHT, | |
bd4c625c | 343 | "PAP-5050: pointer to the key(%p) is NULL or invalid path length(%d)", |
d68caa95 JM |
344 | key, chk_path->path_length); |
345 | RFALSE(!PATH_PLAST_BUFFER(chk_path)->b_bdev, | |
bd4c625c LT |
346 | "PAP-5060: device must not be NODEV"); |
347 | ||
d68caa95 | 348 | if (comp_keys(get_lkey(chk_path, sb), key) == 1) |
bd4c625c LT |
349 | /* left delimiting key is bigger, that the key we look for */ |
350 | return 0; | |
d68caa95 JM |
351 | /* if ( comp_keys(key, get_rkey(chk_path, sb)) != -1 ) */ |
352 | if (comp_keys(get_rkey(chk_path, sb), key) != 1) | |
353 | /* key must be less than right delimitiing key */ | |
bd4c625c LT |
354 | return 0; |
355 | return 1; | |
1da177e4 LT |
356 | } |
357 | ||
fec6d055 | 358 | int reiserfs_check_path(struct treepath *p) |
bd4c625c LT |
359 | { |
360 | RFALSE(p->path_length != ILLEGAL_PATH_ELEMENT_OFFSET, | |
361 | "path not properly relsed"); | |
362 | return 0; | |
363 | } | |
1da177e4 | 364 | |
3cd6dbe6 JM |
365 | /* Drop the reference to each buffer in a path and restore |
366 | * dirty bits clean when preparing the buffer for the log. | |
367 | * This version should only be called from fix_nodes() */ | |
368 | void pathrelse_and_restore(struct super_block *sb, | |
d68caa95 | 369 | struct treepath *search_path) |
bd4c625c | 370 | { |
ee93961b | 371 | int path_offset = search_path->path_length; |
bd4c625c | 372 | |
ee93961b | 373 | RFALSE(path_offset < ILLEGAL_PATH_ELEMENT_OFFSET, |
bd4c625c LT |
374 | "clm-4000: invalid path offset"); |
375 | ||
ee93961b | 376 | while (path_offset > ILLEGAL_PATH_ELEMENT_OFFSET) { |
3cd6dbe6 | 377 | struct buffer_head *bh; |
ee93961b | 378 | bh = PATH_OFFSET_PBUFFER(search_path, path_offset--); |
3cd6dbe6 JM |
379 | reiserfs_restore_prepared_buffer(sb, bh); |
380 | brelse(bh); | |
bd4c625c | 381 | } |
d68caa95 | 382 | search_path->path_length = ILLEGAL_PATH_ELEMENT_OFFSET; |
1da177e4 LT |
383 | } |
384 | ||
3cd6dbe6 | 385 | /* Drop the reference to each buffer in a path */ |
d68caa95 | 386 | void pathrelse(struct treepath *search_path) |
bd4c625c | 387 | { |
ee93961b | 388 | int path_offset = search_path->path_length; |
1da177e4 | 389 | |
ee93961b | 390 | RFALSE(path_offset < ILLEGAL_PATH_ELEMENT_OFFSET, |
bd4c625c | 391 | "PAP-5090: invalid path offset"); |
1da177e4 | 392 | |
ee93961b JM |
393 | while (path_offset > ILLEGAL_PATH_ELEMENT_OFFSET) |
394 | brelse(PATH_OFFSET_PBUFFER(search_path, path_offset--)); | |
1da177e4 | 395 | |
d68caa95 | 396 | search_path->path_length = ILLEGAL_PATH_ELEMENT_OFFSET; |
bd4c625c | 397 | } |
1da177e4 | 398 | |
bd4c625c LT |
399 | static int is_leaf(char *buf, int blocksize, struct buffer_head *bh) |
400 | { | |
401 | struct block_head *blkh; | |
402 | struct item_head *ih; | |
403 | int used_space; | |
404 | int prev_location; | |
405 | int i; | |
406 | int nr; | |
407 | ||
408 | blkh = (struct block_head *)buf; | |
409 | if (blkh_level(blkh) != DISK_LEAF_NODE_LEVEL) { | |
45b03d5e JM |
410 | reiserfs_warning(NULL, "reiserfs-5080", |
411 | "this should be caught earlier"); | |
bd4c625c | 412 | return 0; |
1da177e4 | 413 | } |
bd4c625c LT |
414 | |
415 | nr = blkh_nr_item(blkh); | |
416 | if (nr < 1 || nr > ((blocksize - BLKH_SIZE) / (IH_SIZE + MIN_ITEM_LEN))) { | |
417 | /* item number is too big or too small */ | |
45b03d5e JM |
418 | reiserfs_warning(NULL, "reiserfs-5081", |
419 | "nr_item seems wrong: %z", bh); | |
bd4c625c | 420 | return 0; |
1da177e4 | 421 | } |
bd4c625c LT |
422 | ih = (struct item_head *)(buf + BLKH_SIZE) + nr - 1; |
423 | used_space = BLKH_SIZE + IH_SIZE * nr + (blocksize - ih_location(ih)); | |
424 | if (used_space != blocksize - blkh_free_space(blkh)) { | |
425 | /* free space does not match to calculated amount of use space */ | |
45b03d5e JM |
426 | reiserfs_warning(NULL, "reiserfs-5082", |
427 | "free space seems wrong: %z", bh); | |
bd4c625c | 428 | return 0; |
1da177e4 | 429 | } |
bd4c625c LT |
430 | // FIXME: it is_leaf will hit performance too much - we may have |
431 | // return 1 here | |
432 | ||
433 | /* check tables of item heads */ | |
434 | ih = (struct item_head *)(buf + BLKH_SIZE); | |
435 | prev_location = blocksize; | |
436 | for (i = 0; i < nr; i++, ih++) { | |
437 | if (le_ih_k_type(ih) == TYPE_ANY) { | |
45b03d5e JM |
438 | reiserfs_warning(NULL, "reiserfs-5083", |
439 | "wrong item type for item %h", | |
bd4c625c LT |
440 | ih); |
441 | return 0; | |
442 | } | |
443 | if (ih_location(ih) >= blocksize | |
444 | || ih_location(ih) < IH_SIZE * nr) { | |
45b03d5e JM |
445 | reiserfs_warning(NULL, "reiserfs-5084", |
446 | "item location seems wrong: %h", | |
bd4c625c LT |
447 | ih); |
448 | return 0; | |
449 | } | |
450 | if (ih_item_len(ih) < 1 | |
451 | || ih_item_len(ih) > MAX_ITEM_LEN(blocksize)) { | |
45b03d5e JM |
452 | reiserfs_warning(NULL, "reiserfs-5085", |
453 | "item length seems wrong: %h", | |
bd4c625c LT |
454 | ih); |
455 | return 0; | |
456 | } | |
457 | if (prev_location - ih_location(ih) != ih_item_len(ih)) { | |
45b03d5e JM |
458 | reiserfs_warning(NULL, "reiserfs-5086", |
459 | "item location seems wrong " | |
460 | "(second one): %h", ih); | |
bd4c625c LT |
461 | return 0; |
462 | } | |
463 | prev_location = ih_location(ih); | |
1da177e4 | 464 | } |
1da177e4 | 465 | |
bd4c625c LT |
466 | // one may imagine much more checks |
467 | return 1; | |
1da177e4 LT |
468 | } |
469 | ||
1da177e4 | 470 | /* returns 1 if buf looks like an internal node, 0 otherwise */ |
bd4c625c | 471 | static int is_internal(char *buf, int blocksize, struct buffer_head *bh) |
1da177e4 | 472 | { |
bd4c625c LT |
473 | struct block_head *blkh; |
474 | int nr; | |
475 | int used_space; | |
476 | ||
477 | blkh = (struct block_head *)buf; | |
478 | nr = blkh_level(blkh); | |
479 | if (nr <= DISK_LEAF_NODE_LEVEL || nr > MAX_HEIGHT) { | |
480 | /* this level is not possible for internal nodes */ | |
45b03d5e JM |
481 | reiserfs_warning(NULL, "reiserfs-5087", |
482 | "this should be caught earlier"); | |
bd4c625c LT |
483 | return 0; |
484 | } | |
1da177e4 | 485 | |
bd4c625c LT |
486 | nr = blkh_nr_item(blkh); |
487 | if (nr > (blocksize - BLKH_SIZE - DC_SIZE) / (KEY_SIZE + DC_SIZE)) { | |
488 | /* for internal which is not root we might check min number of keys */ | |
45b03d5e JM |
489 | reiserfs_warning(NULL, "reiserfs-5088", |
490 | "number of key seems wrong: %z", bh); | |
bd4c625c LT |
491 | return 0; |
492 | } | |
1da177e4 | 493 | |
bd4c625c LT |
494 | used_space = BLKH_SIZE + KEY_SIZE * nr + DC_SIZE * (nr + 1); |
495 | if (used_space != blocksize - blkh_free_space(blkh)) { | |
45b03d5e JM |
496 | reiserfs_warning(NULL, "reiserfs-5089", |
497 | "free space seems wrong: %z", bh); | |
bd4c625c LT |
498 | return 0; |
499 | } | |
500 | // one may imagine much more checks | |
501 | return 1; | |
1da177e4 LT |
502 | } |
503 | ||
1da177e4 LT |
504 | // make sure that bh contains formatted node of reiserfs tree of |
505 | // 'level'-th level | |
bd4c625c | 506 | static int is_tree_node(struct buffer_head *bh, int level) |
1da177e4 | 507 | { |
bd4c625c | 508 | if (B_LEVEL(bh) != level) { |
45b03d5e JM |
509 | reiserfs_warning(NULL, "reiserfs-5090", "node level %d does " |
510 | "not match to the expected one %d", | |
bd4c625c LT |
511 | B_LEVEL(bh), level); |
512 | return 0; | |
513 | } | |
514 | if (level == DISK_LEAF_NODE_LEVEL) | |
515 | return is_leaf(bh->b_data, bh->b_size, bh); | |
1da177e4 | 516 | |
bd4c625c | 517 | return is_internal(bh->b_data, bh->b_size, bh); |
1da177e4 LT |
518 | } |
519 | ||
1da177e4 LT |
520 | #define SEARCH_BY_KEY_READA 16 |
521 | ||
522 | /* The function is NOT SCHEDULE-SAFE! */ | |
bd4c625c LT |
523 | static void search_by_key_reada(struct super_block *s, |
524 | struct buffer_head **bh, | |
3ee16670 | 525 | b_blocknr_t *b, int num) |
1da177e4 | 526 | { |
bd4c625c LT |
527 | int i, j; |
528 | ||
529 | for (i = 0; i < num; i++) { | |
530 | bh[i] = sb_getblk(s, b[i]); | |
531 | } | |
532 | for (j = 0; j < i; j++) { | |
533 | /* | |
534 | * note, this needs attention if we are getting rid of the BKL | |
535 | * you have to make sure the prepared bit isn't set on this buffer | |
536 | */ | |
537 | if (!buffer_uptodate(bh[j])) | |
538 | ll_rw_block(READA, 1, bh + j); | |
539 | brelse(bh[j]); | |
540 | } | |
1da177e4 LT |
541 | } |
542 | ||
543 | /************************************************************************** | |
544 | * Algorithm SearchByKey * | |
545 | * look for item in the Disk S+Tree by its key * | |
a9dd3643 | 546 | * Input: sb - super block * |
d68caa95 | 547 | * key - pointer to the key to search * |
1da177e4 | 548 | * Output: ITEM_FOUND, ITEM_NOT_FOUND or IO_ERROR * |
d68caa95 | 549 | * search_path - path from the root to the needed leaf * |
1da177e4 LT |
550 | **************************************************************************/ |
551 | ||
552 | /* This function fills up the path from the root to the leaf as it | |
553 | descends the tree looking for the key. It uses reiserfs_bread to | |
554 | try to find buffers in the cache given their block number. If it | |
555 | does not find them in the cache it reads them from disk. For each | |
556 | node search_by_key finds using reiserfs_bread it then uses | |
557 | bin_search to look through that node. bin_search will find the | |
558 | position of the block_number of the next node if it is looking | |
559 | through an internal node. If it is looking through a leaf node | |
560 | bin_search will find the position of the item which has key either | |
561 | equal to given key, or which is the maximal key less than the given | |
562 | key. search_by_key returns a path that must be checked for the | |
563 | correctness of the top of the path but need not be checked for the | |
564 | correctness of the bottom of the path */ | |
565 | /* The function is NOT SCHEDULE-SAFE! */ | |
d68caa95 JM |
566 | int search_by_key(struct super_block *sb, const struct cpu_key *key, /* Key to search. */ |
567 | struct treepath *search_path,/* This structure was | |
bd4c625c LT |
568 | allocated and initialized |
569 | by the calling | |
570 | function. It is filled up | |
571 | by this function. */ | |
ee93961b | 572 | int stop_level /* How far down the tree to search. To |
bd4c625c LT |
573 | stop at leaf level - set to |
574 | DISK_LEAF_NODE_LEVEL */ | |
575 | ) | |
576 | { | |
ee93961b | 577 | b_blocknr_t block_number; |
bd4c625c | 578 | int expected_level; |
ad31a4fc | 579 | struct buffer_head *bh; |
d68caa95 | 580 | struct path_element *last_element; |
ee93961b | 581 | int node_level, retval; |
bd4c625c LT |
582 | int right_neighbor_of_leaf_node; |
583 | int fs_gen; | |
584 | struct buffer_head *reada_bh[SEARCH_BY_KEY_READA]; | |
3ee16670 | 585 | b_blocknr_t reada_blocks[SEARCH_BY_KEY_READA]; |
bd4c625c | 586 | int reada_count = 0; |
1da177e4 LT |
587 | |
588 | #ifdef CONFIG_REISERFS_CHECK | |
ee93961b | 589 | int repeat_counter = 0; |
1da177e4 | 590 | #endif |
1da177e4 | 591 | |
a9dd3643 | 592 | PROC_INFO_INC(sb, search_by_key); |
bd4c625c LT |
593 | |
594 | /* As we add each node to a path we increase its count. This means that | |
595 | we must be careful to release all nodes in a path before we either | |
596 | discard the path struct or re-use the path struct, as we do here. */ | |
1da177e4 | 597 | |
d68caa95 | 598 | pathrelse(search_path); |
1da177e4 | 599 | |
bd4c625c LT |
600 | right_neighbor_of_leaf_node = 0; |
601 | ||
602 | /* With each iteration of this loop we search through the items in the | |
603 | current node, and calculate the next current node(next path element) | |
604 | for the next iteration of this loop.. */ | |
ee93961b | 605 | block_number = SB_ROOT_BLOCK(sb); |
bd4c625c LT |
606 | expected_level = -1; |
607 | while (1) { | |
1da177e4 LT |
608 | |
609 | #ifdef CONFIG_REISERFS_CHECK | |
ee93961b | 610 | if (!(++repeat_counter % 50000)) |
a9dd3643 | 611 | reiserfs_warning(sb, "PAP-5100", |
45b03d5e JM |
612 | "%s: there were %d iterations of " |
613 | "while loop looking for key %K", | |
ee93961b | 614 | current->comm, repeat_counter, |
d68caa95 | 615 | key); |
1da177e4 LT |
616 | #endif |
617 | ||
bd4c625c | 618 | /* prep path to have another element added to it. */ |
d68caa95 JM |
619 | last_element = |
620 | PATH_OFFSET_PELEMENT(search_path, | |
621 | ++search_path->path_length); | |
a9dd3643 | 622 | fs_gen = get_generation(sb); |
bd4c625c LT |
623 | |
624 | /* Read the next tree node, and set the last element in the path to | |
625 | have a pointer to it. */ | |
d68caa95 | 626 | if ((bh = last_element->pe_buffer = |
ee93961b | 627 | sb_getblk(sb, block_number))) { |
ad31a4fc | 628 | if (!buffer_uptodate(bh) && reada_count > 1) |
a9dd3643 | 629 | search_by_key_reada(sb, reada_bh, |
bd4c625c | 630 | reada_blocks, reada_count); |
ad31a4fc JM |
631 | ll_rw_block(READ, 1, &bh); |
632 | wait_on_buffer(bh); | |
633 | if (!buffer_uptodate(bh)) | |
bd4c625c LT |
634 | goto io_error; |
635 | } else { | |
636 | io_error: | |
d68caa95 JM |
637 | search_path->path_length--; |
638 | pathrelse(search_path); | |
bd4c625c LT |
639 | return IO_ERROR; |
640 | } | |
641 | reada_count = 0; | |
642 | if (expected_level == -1) | |
a9dd3643 | 643 | expected_level = SB_TREE_HEIGHT(sb); |
bd4c625c LT |
644 | expected_level--; |
645 | ||
646 | /* It is possible that schedule occurred. We must check whether the key | |
647 | to search is still in the tree rooted from the current buffer. If | |
648 | not then repeat search from the root. */ | |
a9dd3643 | 649 | if (fs_changed(fs_gen, sb) && |
ad31a4fc JM |
650 | (!B_IS_IN_TREE(bh) || |
651 | B_LEVEL(bh) != expected_level || | |
d68caa95 | 652 | !key_in_buffer(search_path, key, sb))) { |
a9dd3643 JM |
653 | PROC_INFO_INC(sb, search_by_key_fs_changed); |
654 | PROC_INFO_INC(sb, search_by_key_restarted); | |
655 | PROC_INFO_INC(sb, | |
bd4c625c | 656 | sbk_restarted[expected_level - 1]); |
d68caa95 | 657 | pathrelse(search_path); |
bd4c625c LT |
658 | |
659 | /* Get the root block number so that we can repeat the search | |
660 | starting from the root. */ | |
ee93961b | 661 | block_number = SB_ROOT_BLOCK(sb); |
bd4c625c LT |
662 | expected_level = -1; |
663 | right_neighbor_of_leaf_node = 0; | |
664 | ||
665 | /* repeat search from the root */ | |
666 | continue; | |
667 | } | |
1da177e4 | 668 | |
d68caa95 | 669 | /* only check that the key is in the buffer if key is not |
bd4c625c LT |
670 | equal to the MAX_KEY. Latter case is only possible in |
671 | "finish_unfinished()" processing during mount. */ | |
d68caa95 JM |
672 | RFALSE(comp_keys(&MAX_KEY, key) && |
673 | !key_in_buffer(search_path, key, sb), | |
bd4c625c | 674 | "PAP-5130: key is not in the buffer"); |
1da177e4 | 675 | #ifdef CONFIG_REISERFS_CHECK |
bd4c625c LT |
676 | if (cur_tb) { |
677 | print_cur_tb("5140"); | |
a9dd3643 | 678 | reiserfs_panic(sb, "PAP-5140", |
c3a9c210 | 679 | "schedule occurred in do_balance!"); |
bd4c625c | 680 | } |
1da177e4 LT |
681 | #endif |
682 | ||
bd4c625c LT |
683 | // make sure, that the node contents look like a node of |
684 | // certain level | |
ad31a4fc | 685 | if (!is_tree_node(bh, expected_level)) { |
a9dd3643 | 686 | reiserfs_error(sb, "vs-5150", |
0030b645 | 687 | "invalid format found in block %ld. " |
ad31a4fc | 688 | "Fsck?", bh->b_blocknr); |
d68caa95 | 689 | pathrelse(search_path); |
bd4c625c LT |
690 | return IO_ERROR; |
691 | } | |
1da177e4 | 692 | |
bd4c625c | 693 | /* ok, we have acquired next formatted node in the tree */ |
ee93961b | 694 | node_level = B_LEVEL(bh); |
1da177e4 | 695 | |
ee93961b | 696 | PROC_INFO_BH_STAT(sb, bh, node_level - 1); |
1da177e4 | 697 | |
ee93961b | 698 | RFALSE(node_level < stop_level, |
bd4c625c | 699 | "vs-5152: tree level (%d) is less than stop level (%d)", |
ee93961b | 700 | node_level, stop_level); |
1da177e4 | 701 | |
ee93961b | 702 | retval = bin_search(key, B_N_PITEM_HEAD(bh, 0), |
ad31a4fc | 703 | B_NR_ITEMS(bh), |
ee93961b | 704 | (node_level == |
bd4c625c LT |
705 | DISK_LEAF_NODE_LEVEL) ? IH_SIZE : |
706 | KEY_SIZE, | |
d68caa95 | 707 | &(last_element->pe_position)); |
ee93961b JM |
708 | if (node_level == stop_level) { |
709 | return retval; | |
bd4c625c | 710 | } |
1da177e4 | 711 | |
bd4c625c | 712 | /* we are not in the stop level */ |
ee93961b | 713 | if (retval == ITEM_FOUND) |
bd4c625c | 714 | /* item has been found, so we choose the pointer which is to the right of the found one */ |
d68caa95 | 715 | last_element->pe_position++; |
bd4c625c LT |
716 | |
717 | /* if item was not found we choose the position which is to | |
718 | the left of the found item. This requires no code, | |
719 | bin_search did it already. */ | |
720 | ||
721 | /* So we have chosen a position in the current node which is | |
722 | an internal node. Now we calculate child block number by | |
723 | position in the node. */ | |
ee93961b | 724 | block_number = |
d68caa95 | 725 | B_N_CHILD_NUM(bh, last_element->pe_position); |
bd4c625c LT |
726 | |
727 | /* if we are going to read leaf nodes, try for read ahead as well */ | |
d68caa95 | 728 | if ((search_path->reada & PATH_READA) && |
ee93961b | 729 | node_level == DISK_LEAF_NODE_LEVEL + 1) { |
d68caa95 | 730 | int pos = last_element->pe_position; |
ad31a4fc | 731 | int limit = B_NR_ITEMS(bh); |
bd4c625c LT |
732 | struct reiserfs_key *le_key; |
733 | ||
d68caa95 | 734 | if (search_path->reada & PATH_READA_BACK) |
bd4c625c LT |
735 | limit = 0; |
736 | while (reada_count < SEARCH_BY_KEY_READA) { | |
737 | if (pos == limit) | |
738 | break; | |
739 | reada_blocks[reada_count++] = | |
ad31a4fc | 740 | B_N_CHILD_NUM(bh, pos); |
d68caa95 | 741 | if (search_path->reada & PATH_READA_BACK) |
bd4c625c LT |
742 | pos--; |
743 | else | |
744 | pos++; | |
745 | ||
746 | /* | |
747 | * check to make sure we're in the same object | |
748 | */ | |
ad31a4fc | 749 | le_key = B_N_PDELIM_KEY(bh, pos); |
bd4c625c | 750 | if (le32_to_cpu(le_key->k_objectid) != |
d68caa95 | 751 | key->on_disk_key.k_objectid) { |
bd4c625c LT |
752 | break; |
753 | } | |
754 | } | |
1da177e4 | 755 | } |
bd4c625c | 756 | } |
1da177e4 LT |
757 | } |
758 | ||
1da177e4 | 759 | /* Form the path to an item and position in this item which contains |
d68caa95 | 760 | file byte defined by key. If there is no such item |
1da177e4 | 761 | corresponding to the key, we point the path to the item with |
d68caa95 | 762 | maximal key less than key, and *pos_in_item is set to one |
1da177e4 | 763 | past the last entry/byte in the item. If searching for entry in a |
d68caa95 | 764 | directory item, and it is not found, *pos_in_item is set to one |
1da177e4 LT |
765 | entry more than the entry with maximal key which is less than the |
766 | sought key. | |
767 | ||
768 | Note that if there is no entry in this same node which is one more, | |
769 | then we point to an imaginary entry. for direct items, the | |
770 | position is in units of bytes, for indirect items the position is | |
771 | in units of blocknr entries, for directory items the position is in | |
772 | units of directory entries. */ | |
773 | ||
774 | /* The function is NOT SCHEDULE-SAFE! */ | |
a9dd3643 | 775 | int search_for_position_by_key(struct super_block *sb, /* Pointer to the super block. */ |
bd4c625c | 776 | const struct cpu_key *p_cpu_key, /* Key to search (cpu variable) */ |
d68caa95 | 777 | struct treepath *search_path /* Filled up by this function. */ |
bd4c625c LT |
778 | ) |
779 | { | |
780 | struct item_head *p_le_ih; /* pointer to on-disk structure */ | |
ee93961b | 781 | int blk_size; |
bd4c625c LT |
782 | loff_t item_offset, offset; |
783 | struct reiserfs_dir_entry de; | |
784 | int retval; | |
785 | ||
786 | /* If searching for directory entry. */ | |
787 | if (is_direntry_cpu_key(p_cpu_key)) | |
d68caa95 | 788 | return search_by_entry_key(sb, p_cpu_key, search_path, |
bd4c625c LT |
789 | &de); |
790 | ||
791 | /* If not searching for directory entry. */ | |
792 | ||
793 | /* If item is found. */ | |
d68caa95 | 794 | retval = search_item(sb, p_cpu_key, search_path); |
bd4c625c LT |
795 | if (retval == IO_ERROR) |
796 | return retval; | |
797 | if (retval == ITEM_FOUND) { | |
1da177e4 | 798 | |
bd4c625c LT |
799 | RFALSE(!ih_item_len |
800 | (B_N_PITEM_HEAD | |
d68caa95 JM |
801 | (PATH_PLAST_BUFFER(search_path), |
802 | PATH_LAST_POSITION(search_path))), | |
bd4c625c | 803 | "PAP-5165: item length equals zero"); |
1da177e4 | 804 | |
d68caa95 | 805 | pos_in_item(search_path) = 0; |
bd4c625c LT |
806 | return POSITION_FOUND; |
807 | } | |
1da177e4 | 808 | |
d68caa95 | 809 | RFALSE(!PATH_LAST_POSITION(search_path), |
bd4c625c | 810 | "PAP-5170: position equals zero"); |
1da177e4 | 811 | |
bd4c625c LT |
812 | /* Item is not found. Set path to the previous item. */ |
813 | p_le_ih = | |
d68caa95 JM |
814 | B_N_PITEM_HEAD(PATH_PLAST_BUFFER(search_path), |
815 | --PATH_LAST_POSITION(search_path)); | |
ee93961b | 816 | blk_size = sb->s_blocksize; |
1da177e4 | 817 | |
bd4c625c LT |
818 | if (comp_short_keys(&(p_le_ih->ih_key), p_cpu_key)) { |
819 | return FILE_NOT_FOUND; | |
820 | } | |
821 | // FIXME: quite ugly this far | |
1da177e4 | 822 | |
bd4c625c LT |
823 | item_offset = le_ih_k_offset(p_le_ih); |
824 | offset = cpu_key_k_offset(p_cpu_key); | |
1da177e4 | 825 | |
bd4c625c LT |
826 | /* Needed byte is contained in the item pointed to by the path. */ |
827 | if (item_offset <= offset && | |
ee93961b | 828 | item_offset + op_bytes_number(p_le_ih, blk_size) > offset) { |
d68caa95 | 829 | pos_in_item(search_path) = offset - item_offset; |
bd4c625c | 830 | if (is_indirect_le_ih(p_le_ih)) { |
ee93961b | 831 | pos_in_item(search_path) /= blk_size; |
bd4c625c LT |
832 | } |
833 | return POSITION_FOUND; | |
1da177e4 | 834 | } |
1da177e4 | 835 | |
bd4c625c LT |
836 | /* Needed byte is not contained in the item pointed to by the |
837 | path. Set pos_in_item out of the item. */ | |
838 | if (is_indirect_le_ih(p_le_ih)) | |
d68caa95 | 839 | pos_in_item(search_path) = |
bd4c625c LT |
840 | ih_item_len(p_le_ih) / UNFM_P_SIZE; |
841 | else | |
d68caa95 | 842 | pos_in_item(search_path) = ih_item_len(p_le_ih); |
bd4c625c LT |
843 | |
844 | return POSITION_NOT_FOUND; | |
845 | } | |
1da177e4 LT |
846 | |
847 | /* Compare given item and item pointed to by the path. */ | |
d68caa95 | 848 | int comp_items(const struct item_head *stored_ih, const struct treepath *path) |
1da177e4 | 849 | { |
d68caa95 | 850 | struct buffer_head *bh = PATH_PLAST_BUFFER(path); |
bd4c625c | 851 | struct item_head *ih; |
1da177e4 | 852 | |
bd4c625c | 853 | /* Last buffer at the path is not in the tree. */ |
ad31a4fc | 854 | if (!B_IS_IN_TREE(bh)) |
bd4c625c | 855 | return 1; |
1da177e4 | 856 | |
bd4c625c | 857 | /* Last path position is invalid. */ |
d68caa95 | 858 | if (PATH_LAST_POSITION(path) >= B_NR_ITEMS(bh)) |
bd4c625c | 859 | return 1; |
1da177e4 | 860 | |
bd4c625c | 861 | /* we need only to know, whether it is the same item */ |
d68caa95 | 862 | ih = get_ih(path); |
bd4c625c | 863 | return memcmp(stored_ih, ih, IH_SIZE); |
1da177e4 LT |
864 | } |
865 | ||
1da177e4 LT |
866 | /* unformatted nodes are not logged anymore, ever. This is safe |
867 | ** now | |
868 | */ | |
869 | #define held_by_others(bh) (atomic_read(&(bh)->b_count) > 1) | |
870 | ||
871 | // block can not be forgotten as it is in I/O or held by someone | |
872 | #define block_in_use(bh) (buffer_locked(bh) || (held_by_others(bh))) | |
873 | ||
1da177e4 | 874 | // prepare for delete or cut of direct item |
fec6d055 | 875 | static inline int prepare_for_direct_item(struct treepath *path, |
bd4c625c LT |
876 | struct item_head *le_ih, |
877 | struct inode *inode, | |
878 | loff_t new_file_length, int *cut_size) | |
1da177e4 | 879 | { |
bd4c625c LT |
880 | loff_t round_len; |
881 | ||
882 | if (new_file_length == max_reiserfs_offset(inode)) { | |
883 | /* item has to be deleted */ | |
884 | *cut_size = -(IH_SIZE + ih_item_len(le_ih)); | |
885 | return M_DELETE; | |
886 | } | |
887 | // new file gets truncated | |
888 | if (get_inode_item_key_version(inode) == KEY_FORMAT_3_6) { | |
0222e657 | 889 | // |
bd4c625c | 890 | round_len = ROUND_UP(new_file_length); |
ee93961b | 891 | /* this was new_file_length < le_ih ... */ |
bd4c625c LT |
892 | if (round_len < le_ih_k_offset(le_ih)) { |
893 | *cut_size = -(IH_SIZE + ih_item_len(le_ih)); | |
894 | return M_DELETE; /* Delete this item. */ | |
895 | } | |
896 | /* Calculate first position and size for cutting from item. */ | |
897 | pos_in_item(path) = round_len - (le_ih_k_offset(le_ih) - 1); | |
898 | *cut_size = -(ih_item_len(le_ih) - pos_in_item(path)); | |
899 | ||
900 | return M_CUT; /* Cut from this item. */ | |
901 | } | |
902 | ||
903 | // old file: items may have any length | |
904 | ||
905 | if (new_file_length < le_ih_k_offset(le_ih)) { | |
906 | *cut_size = -(IH_SIZE + ih_item_len(le_ih)); | |
907 | return M_DELETE; /* Delete this item. */ | |
1da177e4 LT |
908 | } |
909 | /* Calculate first position and size for cutting from item. */ | |
bd4c625c LT |
910 | *cut_size = -(ih_item_len(le_ih) - |
911 | (pos_in_item(path) = | |
912 | new_file_length + 1 - le_ih_k_offset(le_ih))); | |
913 | return M_CUT; /* Cut from this item. */ | |
1da177e4 LT |
914 | } |
915 | ||
fec6d055 | 916 | static inline int prepare_for_direntry_item(struct treepath *path, |
bd4c625c LT |
917 | struct item_head *le_ih, |
918 | struct inode *inode, | |
919 | loff_t new_file_length, | |
920 | int *cut_size) | |
1da177e4 | 921 | { |
bd4c625c LT |
922 | if (le_ih_k_offset(le_ih) == DOT_OFFSET && |
923 | new_file_length == max_reiserfs_offset(inode)) { | |
924 | RFALSE(ih_entry_count(le_ih) != 2, | |
925 | "PAP-5220: incorrect empty directory item (%h)", le_ih); | |
926 | *cut_size = -(IH_SIZE + ih_item_len(le_ih)); | |
927 | return M_DELETE; /* Delete the directory item containing "." and ".." entry. */ | |
928 | } | |
1da177e4 | 929 | |
bd4c625c LT |
930 | if (ih_entry_count(le_ih) == 1) { |
931 | /* Delete the directory item such as there is one record only | |
932 | in this item */ | |
933 | *cut_size = -(IH_SIZE + ih_item_len(le_ih)); | |
934 | return M_DELETE; | |
935 | } | |
936 | ||
937 | /* Cut one record from the directory item. */ | |
938 | *cut_size = | |
939 | -(DEH_SIZE + | |
940 | entry_length(get_last_bh(path), le_ih, pos_in_item(path))); | |
941 | return M_CUT; | |
942 | } | |
1da177e4 | 943 | |
23f9e0f8 AZ |
944 | #define JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD (2 * JOURNAL_PER_BALANCE_CNT + 1) |
945 | ||
1da177e4 LT |
946 | /* If the path points to a directory or direct item, calculate mode and the size cut, for balance. |
947 | If the path points to an indirect item, remove some number of its unformatted nodes. | |
948 | In case of file truncate calculate whether this item must be deleted/truncated or last | |
949 | unformatted node of this item will be converted to a direct item. | |
950 | This function returns a determination of what balance mode the calling function should employ. */ | |
d68caa95 | 951 | static char prepare_for_delete_or_cut(struct reiserfs_transaction_handle *th, struct inode *inode, struct treepath *path, const struct cpu_key *item_key, int *removed, /* Number of unformatted nodes which were removed |
bd4c625c | 952 | from end of the file. */ |
ee93961b | 953 | int *cut_size, unsigned long long new_file_length /* MAX_KEY_OFFSET in case of delete. */ |
bd4c625c LT |
954 | ) |
955 | { | |
a9dd3643 | 956 | struct super_block *sb = inode->i_sb; |
d68caa95 JM |
957 | struct item_head *p_le_ih = PATH_PITEM_HEAD(path); |
958 | struct buffer_head *bh = PATH_PLAST_BUFFER(path); | |
1da177e4 | 959 | |
bd4c625c | 960 | BUG_ON(!th->t_trans_id); |
1da177e4 | 961 | |
bd4c625c LT |
962 | /* Stat_data item. */ |
963 | if (is_statdata_le_ih(p_le_ih)) { | |
1da177e4 | 964 | |
ee93961b | 965 | RFALSE(new_file_length != max_reiserfs_offset(inode), |
bd4c625c | 966 | "PAP-5210: mode must be M_DELETE"); |
1da177e4 | 967 | |
d68caa95 | 968 | *cut_size = -(IH_SIZE + ih_item_len(p_le_ih)); |
bd4c625c LT |
969 | return M_DELETE; |
970 | } | |
1da177e4 | 971 | |
bd4c625c LT |
972 | /* Directory item. */ |
973 | if (is_direntry_le_ih(p_le_ih)) | |
d68caa95 | 974 | return prepare_for_direntry_item(path, p_le_ih, inode, |
ee93961b | 975 | new_file_length, |
d68caa95 | 976 | cut_size); |
1da177e4 | 977 | |
bd4c625c LT |
978 | /* Direct item. */ |
979 | if (is_direct_le_ih(p_le_ih)) | |
d68caa95 | 980 | return prepare_for_direct_item(path, p_le_ih, inode, |
ee93961b | 981 | new_file_length, cut_size); |
bd4c625c LT |
982 | |
983 | /* Case of an indirect item. */ | |
984 | { | |
a9dd3643 | 985 | int blk_size = sb->s_blocksize; |
23f9e0f8 AZ |
986 | struct item_head s_ih; |
987 | int need_re_search; | |
988 | int delete = 0; | |
989 | int result = M_CUT; | |
990 | int pos = 0; | |
991 | ||
ee93961b | 992 | if ( new_file_length == max_reiserfs_offset (inode) ) { |
23f9e0f8 AZ |
993 | /* prepare_for_delete_or_cut() is called by |
994 | * reiserfs_delete_item() */ | |
ee93961b | 995 | new_file_length = 0; |
23f9e0f8 AZ |
996 | delete = 1; |
997 | } | |
998 | ||
999 | do { | |
1000 | need_re_search = 0; | |
d68caa95 JM |
1001 | *cut_size = 0; |
1002 | bh = PATH_PLAST_BUFFER(path); | |
1003 | copy_item_head(&s_ih, PATH_PITEM_HEAD(path)); | |
23f9e0f8 | 1004 | pos = I_UNFM_NUM(&s_ih); |
bd4c625c | 1005 | |
ee93961b | 1006 | while (le_ih_k_offset (&s_ih) + (pos - 1) * blk_size > new_file_length) { |
87588dd6 AV |
1007 | __le32 *unfm; |
1008 | __u32 block; | |
bd4c625c | 1009 | |
23f9e0f8 AZ |
1010 | /* Each unformatted block deletion may involve one additional |
1011 | * bitmap block into the transaction, thereby the initial | |
1012 | * journal space reservation might not be enough. */ | |
d68caa95 JM |
1013 | if (!delete && (*cut_size) != 0 && |
1014 | reiserfs_transaction_free_space(th) < JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD) | |
23f9e0f8 | 1015 | break; |
bd4c625c | 1016 | |
ad31a4fc | 1017 | unfm = (__le32 *)B_I_PITEM(bh, &s_ih) + pos - 1; |
23f9e0f8 | 1018 | block = get_block_num(unfm, 0); |
bd4c625c | 1019 | |
23f9e0f8 | 1020 | if (block != 0) { |
ad31a4fc | 1021 | reiserfs_prepare_for_journal(sb, bh, 1); |
23f9e0f8 | 1022 | put_block_num(unfm, 0, 0); |
ad31a4fc | 1023 | journal_mark_dirty(th, sb, bh); |
23f9e0f8 AZ |
1024 | reiserfs_free_block(th, inode, block, 1); |
1025 | } | |
bd4c625c | 1026 | |
23f9e0f8 | 1027 | cond_resched(); |
bd4c625c | 1028 | |
d68caa95 | 1029 | if (item_moved (&s_ih, path)) { |
23f9e0f8 AZ |
1030 | need_re_search = 1; |
1031 | break; | |
1032 | } | |
1033 | ||
1034 | pos --; | |
d68caa95 JM |
1035 | (*removed)++; |
1036 | (*cut_size) -= UNFM_P_SIZE; | |
23f9e0f8 AZ |
1037 | |
1038 | if (pos == 0) { | |
d68caa95 | 1039 | (*cut_size) -= IH_SIZE; |
23f9e0f8 AZ |
1040 | result = M_DELETE; |
1041 | break; | |
1042 | } | |
1043 | } | |
1044 | /* a trick. If the buffer has been logged, this will do nothing. If | |
1045 | ** we've broken the loop without logging it, it will restore the | |
1046 | ** buffer */ | |
ad31a4fc | 1047 | reiserfs_restore_prepared_buffer(sb, bh); |
23f9e0f8 | 1048 | } while (need_re_search && |
d68caa95 JM |
1049 | search_for_position_by_key(sb, item_key, path) == POSITION_FOUND); |
1050 | pos_in_item(path) = pos * UNFM_P_SIZE; | |
23f9e0f8 | 1051 | |
d68caa95 | 1052 | if (*cut_size == 0) { |
23f9e0f8 AZ |
1053 | /* Nothing were cut. maybe convert last unformatted node to the |
1054 | * direct item? */ | |
1055 | result = M_CONVERT; | |
1056 | } | |
1057 | return result; | |
bd4c625c | 1058 | } |
1da177e4 LT |
1059 | } |
1060 | ||
1061 | /* Calculate number of bytes which will be deleted or cut during balance */ | |
ee93961b | 1062 | static int calc_deleted_bytes_number(struct tree_balance *tb, char mode) |
bd4c625c | 1063 | { |
ee93961b | 1064 | int del_size; |
a063ae17 | 1065 | struct item_head *p_le_ih = PATH_PITEM_HEAD(tb->tb_path); |
bd4c625c LT |
1066 | |
1067 | if (is_statdata_le_ih(p_le_ih)) | |
1068 | return 0; | |
1069 | ||
ee93961b JM |
1070 | del_size = |
1071 | (mode == | |
a063ae17 | 1072 | M_DELETE) ? ih_item_len(p_le_ih) : -tb->insert_size[0]; |
bd4c625c | 1073 | if (is_direntry_le_ih(p_le_ih)) { |
ee93961b JM |
1074 | /* return EMPTY_DIR_SIZE; We delete emty directoris only. |
1075 | * we can't use EMPTY_DIR_SIZE, as old format dirs have a different | |
1076 | * empty size. ick. FIXME, is this right? */ | |
1077 | return del_size; | |
bd4c625c | 1078 | } |
1da177e4 | 1079 | |
bd4c625c | 1080 | if (is_indirect_le_ih(p_le_ih)) |
ee93961b | 1081 | del_size = (del_size / UNFM_P_SIZE) * |
a063ae17 | 1082 | (PATH_PLAST_BUFFER(tb->tb_path)->b_size); |
ee93961b | 1083 | return del_size; |
1da177e4 LT |
1084 | } |
1085 | ||
bd4c625c | 1086 | static void init_tb_struct(struct reiserfs_transaction_handle *th, |
a063ae17 | 1087 | struct tree_balance *tb, |
a9dd3643 | 1088 | struct super_block *sb, |
ee93961b | 1089 | struct treepath *path, int size) |
bd4c625c | 1090 | { |
1da177e4 | 1091 | |
bd4c625c | 1092 | BUG_ON(!th->t_trans_id); |
1da177e4 | 1093 | |
a063ae17 JM |
1094 | memset(tb, '\0', sizeof(struct tree_balance)); |
1095 | tb->transaction_handle = th; | |
1096 | tb->tb_sb = sb; | |
d68caa95 JM |
1097 | tb->tb_path = path; |
1098 | PATH_OFFSET_PBUFFER(path, ILLEGAL_PATH_ELEMENT_OFFSET) = NULL; | |
1099 | PATH_OFFSET_POSITION(path, ILLEGAL_PATH_ELEMENT_OFFSET) = 0; | |
ee93961b | 1100 | tb->insert_size[0] = size; |
bd4c625c | 1101 | } |
1da177e4 | 1102 | |
bd4c625c | 1103 | void padd_item(char *item, int total_length, int length) |
1da177e4 | 1104 | { |
bd4c625c | 1105 | int i; |
1da177e4 | 1106 | |
bd4c625c LT |
1107 | for (i = total_length; i > length;) |
1108 | item[--i] = 0; | |
1da177e4 LT |
1109 | } |
1110 | ||
1111 | #ifdef REISERQUOTA_DEBUG | |
1112 | char key2type(struct reiserfs_key *ih) | |
1113 | { | |
bd4c625c LT |
1114 | if (is_direntry_le_key(2, ih)) |
1115 | return 'd'; | |
1116 | if (is_direct_le_key(2, ih)) | |
1117 | return 'D'; | |
1118 | if (is_indirect_le_key(2, ih)) | |
1119 | return 'i'; | |
1120 | if (is_statdata_le_key(2, ih)) | |
1121 | return 's'; | |
1122 | return 'u'; | |
1da177e4 LT |
1123 | } |
1124 | ||
1125 | char head2type(struct item_head *ih) | |
1126 | { | |
bd4c625c LT |
1127 | if (is_direntry_le_ih(ih)) |
1128 | return 'd'; | |
1129 | if (is_direct_le_ih(ih)) | |
1130 | return 'D'; | |
1131 | if (is_indirect_le_ih(ih)) | |
1132 | return 'i'; | |
1133 | if (is_statdata_le_ih(ih)) | |
1134 | return 's'; | |
1135 | return 'u'; | |
1da177e4 LT |
1136 | } |
1137 | #endif | |
1138 | ||
d68caa95 JM |
1139 | /* Delete object item. |
1140 | * th - active transaction handle | |
1141 | * path - path to the deleted item | |
1142 | * item_key - key to search for the deleted item | |
1143 | * indode - used for updating i_blocks and quotas | |
1144 | * un_bh - NULL or unformatted node pointer | |
1145 | */ | |
1146 | int reiserfs_delete_item(struct reiserfs_transaction_handle *th, | |
1147 | struct treepath *path, const struct cpu_key *item_key, | |
1148 | struct inode *inode, struct buffer_head *un_bh) | |
1149 | { | |
995c762e | 1150 | struct super_block *sb = inode->i_sb; |
bd4c625c LT |
1151 | struct tree_balance s_del_balance; |
1152 | struct item_head s_ih; | |
1153 | struct item_head *q_ih; | |
1154 | int quota_cut_bytes; | |
ee93961b | 1155 | int ret_value, del_size, removed; |
1da177e4 LT |
1156 | |
1157 | #ifdef CONFIG_REISERFS_CHECK | |
ee93961b JM |
1158 | char mode; |
1159 | int iter = 0; | |
1da177e4 LT |
1160 | #endif |
1161 | ||
bd4c625c | 1162 | BUG_ON(!th->t_trans_id); |
1da177e4 | 1163 | |
d68caa95 | 1164 | init_tb_struct(th, &s_del_balance, sb, path, |
bd4c625c | 1165 | 0 /*size is unknown */ ); |
1da177e4 | 1166 | |
bd4c625c | 1167 | while (1) { |
ee93961b | 1168 | removed = 0; |
1da177e4 LT |
1169 | |
1170 | #ifdef CONFIG_REISERFS_CHECK | |
ee93961b JM |
1171 | iter++; |
1172 | mode = | |
1da177e4 | 1173 | #endif |
d68caa95 | 1174 | prepare_for_delete_or_cut(th, inode, path, |
ee93961b JM |
1175 | item_key, &removed, |
1176 | &del_size, | |
995c762e | 1177 | max_reiserfs_offset(inode)); |
bd4c625c | 1178 | |
ee93961b | 1179 | RFALSE(mode != M_DELETE, "PAP-5320: mode must be M_DELETE"); |
bd4c625c | 1180 | |
d68caa95 | 1181 | copy_item_head(&s_ih, PATH_PITEM_HEAD(path)); |
ee93961b | 1182 | s_del_balance.insert_size[0] = del_size; |
bd4c625c | 1183 | |
ee93961b JM |
1184 | ret_value = fix_nodes(M_DELETE, &s_del_balance, NULL, NULL); |
1185 | if (ret_value != REPEAT_SEARCH) | |
bd4c625c LT |
1186 | break; |
1187 | ||
a9dd3643 | 1188 | PROC_INFO_INC(sb, delete_item_restarted); |
bd4c625c LT |
1189 | |
1190 | // file system changed, repeat search | |
ee93961b | 1191 | ret_value = |
d68caa95 | 1192 | search_for_position_by_key(sb, item_key, path); |
ee93961b | 1193 | if (ret_value == IO_ERROR) |
bd4c625c | 1194 | break; |
ee93961b | 1195 | if (ret_value == FILE_NOT_FOUND) { |
a9dd3643 | 1196 | reiserfs_warning(sb, "vs-5340", |
bd4c625c | 1197 | "no items of the file %K found", |
d68caa95 | 1198 | item_key); |
bd4c625c LT |
1199 | break; |
1200 | } | |
1201 | } /* while (1) */ | |
1da177e4 | 1202 | |
ee93961b | 1203 | if (ret_value != CARRY_ON) { |
bd4c625c LT |
1204 | unfix_nodes(&s_del_balance); |
1205 | return 0; | |
1206 | } | |
1207 | // reiserfs_delete_item returns item length when success | |
ee93961b | 1208 | ret_value = calc_deleted_bytes_number(&s_del_balance, M_DELETE); |
d68caa95 | 1209 | q_ih = get_ih(path); |
bd4c625c LT |
1210 | quota_cut_bytes = ih_item_len(q_ih); |
1211 | ||
1212 | /* hack so the quota code doesn't have to guess if the file | |
1213 | ** has a tail. On tail insert, we allocate quota for 1 unformatted node. | |
1214 | ** We test the offset because the tail might have been | |
1215 | ** split into multiple items, and we only want to decrement for | |
1216 | ** the unfm node once | |
1217 | */ | |
995c762e | 1218 | if (!S_ISLNK(inode->i_mode) && is_direct_le_ih(q_ih)) { |
a9dd3643 JM |
1219 | if ((le_ih_k_offset(q_ih) & (sb->s_blocksize - 1)) == 1) { |
1220 | quota_cut_bytes = sb->s_blocksize + UNFM_P_SIZE; | |
bd4c625c LT |
1221 | } else { |
1222 | quota_cut_bytes = 0; | |
1223 | } | |
1da177e4 | 1224 | } |
1da177e4 | 1225 | |
d68caa95 | 1226 | if (un_bh) { |
bd4c625c LT |
1227 | int off; |
1228 | char *data; | |
1229 | ||
1230 | /* We are in direct2indirect conversion, so move tail contents | |
1231 | to the unformatted node */ | |
1232 | /* note, we do the copy before preparing the buffer because we | |
1233 | ** don't care about the contents of the unformatted node yet. | |
1234 | ** the only thing we really care about is the direct item's data | |
1235 | ** is in the unformatted node. | |
1236 | ** | |
1237 | ** Otherwise, we would have to call reiserfs_prepare_for_journal on | |
1238 | ** the unformatted node, which might schedule, meaning we'd have to | |
1239 | ** loop all the way back up to the start of the while loop. | |
1240 | ** | |
1241 | ** The unformatted node must be dirtied later on. We can't be | |
1242 | ** sure here if the entire tail has been deleted yet. | |
1243 | ** | |
d68caa95 | 1244 | ** un_bh is from the page cache (all unformatted nodes are |
bd4c625c | 1245 | ** from the page cache) and might be a highmem page. So, we |
d68caa95 | 1246 | ** can't use un_bh->b_data. |
bd4c625c LT |
1247 | ** -clm |
1248 | */ | |
1249 | ||
d68caa95 | 1250 | data = kmap_atomic(un_bh->b_page, KM_USER0); |
bd4c625c LT |
1251 | off = ((le_ih_k_offset(&s_ih) - 1) & (PAGE_CACHE_SIZE - 1)); |
1252 | memcpy(data + off, | |
d68caa95 | 1253 | B_I_PITEM(PATH_PLAST_BUFFER(path), &s_ih), |
ee93961b | 1254 | ret_value); |
bd4c625c | 1255 | kunmap_atomic(data, KM_USER0); |
1da177e4 | 1256 | } |
bd4c625c LT |
1257 | /* Perform balancing after all resources have been collected at once. */ |
1258 | do_balance(&s_del_balance, NULL, NULL, M_DELETE); | |
1da177e4 LT |
1259 | |
1260 | #ifdef REISERQUOTA_DEBUG | |
a9dd3643 | 1261 | reiserfs_debug(sb, REISERFS_DEBUG_CODE, |
bd4c625c | 1262 | "reiserquota delete_item(): freeing %u, id=%u type=%c", |
995c762e | 1263 | quota_cut_bytes, inode->i_uid, head2type(&s_ih)); |
1da177e4 | 1264 | #endif |
e1c50248 | 1265 | vfs_dq_free_space_nodirty(inode, quota_cut_bytes); |
1da177e4 | 1266 | |
bd4c625c | 1267 | /* Return deleted body length */ |
ee93961b | 1268 | return ret_value; |
1da177e4 LT |
1269 | } |
1270 | ||
1da177e4 LT |
1271 | /* Summary Of Mechanisms For Handling Collisions Between Processes: |
1272 | ||
1273 | deletion of the body of the object is performed by iput(), with the | |
1274 | result that if multiple processes are operating on a file, the | |
1275 | deletion of the body of the file is deferred until the last process | |
1276 | that has an open inode performs its iput(). | |
1277 | ||
1278 | writes and truncates are protected from collisions by use of | |
1279 | semaphores. | |
1280 | ||
1281 | creates, linking, and mknod are protected from collisions with other | |
1282 | processes by making the reiserfs_add_entry() the last step in the | |
1283 | creation, and then rolling back all changes if there was a collision. | |
1284 | - Hans | |
1285 | */ | |
1286 | ||
1da177e4 | 1287 | /* this deletes item which never gets split */ |
bd4c625c LT |
1288 | void reiserfs_delete_solid_item(struct reiserfs_transaction_handle *th, |
1289 | struct inode *inode, struct reiserfs_key *key) | |
1da177e4 | 1290 | { |
bd4c625c LT |
1291 | struct tree_balance tb; |
1292 | INITIALIZE_PATH(path); | |
1293 | int item_len = 0; | |
1294 | int tb_init = 0; | |
1295 | struct cpu_key cpu_key; | |
1296 | int retval; | |
1297 | int quota_cut_bytes = 0; | |
1298 | ||
1299 | BUG_ON(!th->t_trans_id); | |
1300 | ||
1301 | le_key2cpu_key(&cpu_key, key); | |
1302 | ||
1303 | while (1) { | |
1304 | retval = search_item(th->t_super, &cpu_key, &path); | |
1305 | if (retval == IO_ERROR) { | |
0030b645 JM |
1306 | reiserfs_error(th->t_super, "vs-5350", |
1307 | "i/o failure occurred trying " | |
1308 | "to delete %K", &cpu_key); | |
bd4c625c LT |
1309 | break; |
1310 | } | |
1311 | if (retval != ITEM_FOUND) { | |
1312 | pathrelse(&path); | |
1313 | // No need for a warning, if there is just no free space to insert '..' item into the newly-created subdir | |
1314 | if (! | |
1315 | ((unsigned long long) | |
1316 | GET_HASH_VALUE(le_key_k_offset | |
1317 | (le_key_version(key), key)) == 0 | |
1318 | && (unsigned long long) | |
1319 | GET_GENERATION_NUMBER(le_key_k_offset | |
1320 | (le_key_version(key), | |
1321 | key)) == 1)) | |
45b03d5e JM |
1322 | reiserfs_warning(th->t_super, "vs-5355", |
1323 | "%k not found", key); | |
bd4c625c LT |
1324 | break; |
1325 | } | |
1326 | if (!tb_init) { | |
1327 | tb_init = 1; | |
1328 | item_len = ih_item_len(PATH_PITEM_HEAD(&path)); | |
1329 | init_tb_struct(th, &tb, th->t_super, &path, | |
1330 | -(IH_SIZE + item_len)); | |
1331 | } | |
1332 | quota_cut_bytes = ih_item_len(PATH_PITEM_HEAD(&path)); | |
1da177e4 | 1333 | |
bd4c625c LT |
1334 | retval = fix_nodes(M_DELETE, &tb, NULL, NULL); |
1335 | if (retval == REPEAT_SEARCH) { | |
1336 | PROC_INFO_INC(th->t_super, delete_solid_item_restarted); | |
1337 | continue; | |
1338 | } | |
1da177e4 | 1339 | |
bd4c625c LT |
1340 | if (retval == CARRY_ON) { |
1341 | do_balance(&tb, NULL, NULL, M_DELETE); | |
1342 | if (inode) { /* Should we count quota for item? (we don't count quotas for save-links) */ | |
1da177e4 | 1343 | #ifdef REISERQUOTA_DEBUG |
bd4c625c LT |
1344 | reiserfs_debug(th->t_super, REISERFS_DEBUG_CODE, |
1345 | "reiserquota delete_solid_item(): freeing %u id=%u type=%c", | |
1346 | quota_cut_bytes, inode->i_uid, | |
1347 | key2type(key)); | |
1da177e4 | 1348 | #endif |
77db4f25 | 1349 | vfs_dq_free_space_nodirty(inode, |
bd4c625c LT |
1350 | quota_cut_bytes); |
1351 | } | |
1352 | break; | |
1353 | } | |
1354 | // IO_ERROR, NO_DISK_SPACE, etc | |
45b03d5e | 1355 | reiserfs_warning(th->t_super, "vs-5360", |
bd4c625c LT |
1356 | "could not delete %K due to fix_nodes failure", |
1357 | &cpu_key); | |
1358 | unfix_nodes(&tb); | |
1359 | break; | |
1da177e4 LT |
1360 | } |
1361 | ||
bd4c625c | 1362 | reiserfs_check_path(&path); |
1da177e4 LT |
1363 | } |
1364 | ||
bd4c625c LT |
1365 | int reiserfs_delete_object(struct reiserfs_transaction_handle *th, |
1366 | struct inode *inode) | |
1da177e4 | 1367 | { |
bd4c625c LT |
1368 | int err; |
1369 | inode->i_size = 0; | |
1370 | BUG_ON(!th->t_trans_id); | |
1371 | ||
1372 | /* for directory this deletes item containing "." and ".." */ | |
1373 | err = | |
1374 | reiserfs_do_truncate(th, inode, NULL, 0 /*no timestamp updates */ ); | |
1375 | if (err) | |
1376 | return err; | |
1377 | ||
1da177e4 | 1378 | #if defined( USE_INODE_GENERATION_COUNTER ) |
bd4c625c LT |
1379 | if (!old_format_only(th->t_super)) { |
1380 | __le32 *inode_generation; | |
1381 | ||
1382 | inode_generation = | |
1383 | &REISERFS_SB(th->t_super)->s_rs->s_inode_generation; | |
9e902df6 | 1384 | le32_add_cpu(inode_generation, 1); |
bd4c625c | 1385 | } |
1da177e4 LT |
1386 | /* USE_INODE_GENERATION_COUNTER */ |
1387 | #endif | |
bd4c625c | 1388 | reiserfs_delete_solid_item(th, inode, INODE_PKEY(inode)); |
1da177e4 | 1389 | |
bd4c625c | 1390 | return err; |
1da177e4 LT |
1391 | } |
1392 | ||
bd4c625c LT |
1393 | static void unmap_buffers(struct page *page, loff_t pos) |
1394 | { | |
1395 | struct buffer_head *bh; | |
1396 | struct buffer_head *head; | |
1397 | struct buffer_head *next; | |
1398 | unsigned long tail_index; | |
1399 | unsigned long cur_index; | |
1400 | ||
1401 | if (page) { | |
1402 | if (page_has_buffers(page)) { | |
1403 | tail_index = pos & (PAGE_CACHE_SIZE - 1); | |
1404 | cur_index = 0; | |
1405 | head = page_buffers(page); | |
1406 | bh = head; | |
1407 | do { | |
1408 | next = bh->b_this_page; | |
1409 | ||
1410 | /* we want to unmap the buffers that contain the tail, and | |
1411 | ** all the buffers after it (since the tail must be at the | |
1412 | ** end of the file). We don't want to unmap file data | |
1413 | ** before the tail, since it might be dirty and waiting to | |
1414 | ** reach disk | |
1415 | */ | |
1416 | cur_index += bh->b_size; | |
1417 | if (cur_index > tail_index) { | |
1418 | reiserfs_unmap_buffer(bh); | |
1419 | } | |
1420 | bh = next; | |
1421 | } while (bh != head); | |
1da177e4 | 1422 | } |
1da177e4 | 1423 | } |
1da177e4 LT |
1424 | } |
1425 | ||
bd4c625c | 1426 | static int maybe_indirect_to_direct(struct reiserfs_transaction_handle *th, |
995c762e | 1427 | struct inode *inode, |
bd4c625c | 1428 | struct page *page, |
d68caa95 JM |
1429 | struct treepath *path, |
1430 | const struct cpu_key *item_key, | |
ee93961b | 1431 | loff_t new_file_size, char *mode) |
bd4c625c | 1432 | { |
995c762e | 1433 | struct super_block *sb = inode->i_sb; |
ee93961b | 1434 | int block_size = sb->s_blocksize; |
bd4c625c LT |
1435 | int cut_bytes; |
1436 | BUG_ON(!th->t_trans_id); | |
ee93961b | 1437 | BUG_ON(new_file_size != inode->i_size); |
1da177e4 | 1438 | |
bd4c625c LT |
1439 | /* the page being sent in could be NULL if there was an i/o error |
1440 | ** reading in the last block. The user will hit problems trying to | |
1441 | ** read the file, but for now we just skip the indirect2direct | |
1442 | */ | |
995c762e JM |
1443 | if (atomic_read(&inode->i_count) > 1 || |
1444 | !tail_has_to_be_packed(inode) || | |
1445 | !page || (REISERFS_I(inode)->i_flags & i_nopack_mask)) { | |
0222e657 | 1446 | /* leave tail in an unformatted node */ |
d68caa95 | 1447 | *mode = M_SKIP_BALANCING; |
bd4c625c | 1448 | cut_bytes = |
ee93961b | 1449 | block_size - (new_file_size & (block_size - 1)); |
d68caa95 | 1450 | pathrelse(path); |
bd4c625c LT |
1451 | return cut_bytes; |
1452 | } | |
d68caa95 JM |
1453 | /* Perform the conversion to a direct_item. */ |
1454 | /* return indirect_to_direct(inode, path, item_key, | |
ee93961b | 1455 | new_file_size, mode); */ |
d68caa95 | 1456 | return indirect2direct(th, inode, page, path, item_key, |
ee93961b | 1457 | new_file_size, mode); |
bd4c625c | 1458 | } |
1da177e4 LT |
1459 | |
1460 | /* we did indirect_to_direct conversion. And we have inserted direct | |
1461 | item successesfully, but there were no disk space to cut unfm | |
1462 | pointer being converted. Therefore we have to delete inserted | |
1463 | direct item(s) */ | |
bd4c625c | 1464 | static void indirect_to_direct_roll_back(struct reiserfs_transaction_handle *th, |
fec6d055 | 1465 | struct inode *inode, struct treepath *path) |
1da177e4 | 1466 | { |
bd4c625c LT |
1467 | struct cpu_key tail_key; |
1468 | int tail_len; | |
1469 | int removed; | |
1470 | BUG_ON(!th->t_trans_id); | |
1471 | ||
1472 | make_cpu_key(&tail_key, inode, inode->i_size + 1, TYPE_DIRECT, 4); // !!!! | |
1473 | tail_key.key_length = 4; | |
1474 | ||
1475 | tail_len = | |
1476 | (cpu_key_k_offset(&tail_key) & (inode->i_sb->s_blocksize - 1)) - 1; | |
1477 | while (tail_len) { | |
1478 | /* look for the last byte of the tail */ | |
1479 | if (search_for_position_by_key(inode->i_sb, &tail_key, path) == | |
1480 | POSITION_NOT_FOUND) | |
c3a9c210 JM |
1481 | reiserfs_panic(inode->i_sb, "vs-5615", |
1482 | "found invalid item"); | |
bd4c625c LT |
1483 | RFALSE(path->pos_in_item != |
1484 | ih_item_len(PATH_PITEM_HEAD(path)) - 1, | |
1485 | "vs-5616: appended bytes found"); | |
1486 | PATH_LAST_POSITION(path)--; | |
1487 | ||
1488 | removed = | |
1489 | reiserfs_delete_item(th, path, &tail_key, inode, | |
1490 | NULL /*unbh not needed */ ); | |
1491 | RFALSE(removed <= 0 | |
1492 | || removed > tail_len, | |
1493 | "vs-5617: there was tail %d bytes, removed item length %d bytes", | |
1494 | tail_len, removed); | |
1495 | tail_len -= removed; | |
1496 | set_cpu_key_k_offset(&tail_key, | |
1497 | cpu_key_k_offset(&tail_key) - removed); | |
1498 | } | |
45b03d5e JM |
1499 | reiserfs_warning(inode->i_sb, "reiserfs-5091", "indirect_to_direct " |
1500 | "conversion has been rolled back due to " | |
1501 | "lack of disk space"); | |
bd4c625c LT |
1502 | //mark_file_without_tail (inode); |
1503 | mark_inode_dirty(inode); | |
1da177e4 LT |
1504 | } |
1505 | ||
1da177e4 | 1506 | /* (Truncate or cut entry) or delete object item. Returns < 0 on failure */ |
bd4c625c | 1507 | int reiserfs_cut_from_item(struct reiserfs_transaction_handle *th, |
d68caa95 JM |
1508 | struct treepath *path, |
1509 | struct cpu_key *item_key, | |
995c762e | 1510 | struct inode *inode, |
ee93961b | 1511 | struct page *page, loff_t new_file_size) |
1da177e4 | 1512 | { |
995c762e | 1513 | struct super_block *sb = inode->i_sb; |
bd4c625c LT |
1514 | /* Every function which is going to call do_balance must first |
1515 | create a tree_balance structure. Then it must fill up this | |
1516 | structure by using the init_tb_struct and fix_nodes functions. | |
1517 | After that we can make tree balancing. */ | |
1518 | struct tree_balance s_cut_balance; | |
1519 | struct item_head *p_le_ih; | |
ee93961b JM |
1520 | int cut_size = 0, /* Amount to be cut. */ |
1521 | ret_value = CARRY_ON, removed = 0, /* Number of the removed unformatted nodes. */ | |
1522 | is_inode_locked = 0; | |
1523 | char mode; /* Mode of the balance. */ | |
bd4c625c LT |
1524 | int retval2 = -1; |
1525 | int quota_cut_bytes; | |
1526 | loff_t tail_pos = 0; | |
1527 | ||
1528 | BUG_ON(!th->t_trans_id); | |
1529 | ||
d68caa95 | 1530 | init_tb_struct(th, &s_cut_balance, inode->i_sb, path, |
ee93961b | 1531 | cut_size); |
bd4c625c LT |
1532 | |
1533 | /* Repeat this loop until we either cut the item without needing | |
1534 | to balance, or we fix_nodes without schedule occurring */ | |
1535 | while (1) { | |
1536 | /* Determine the balance mode, position of the first byte to | |
1537 | be cut, and size to be cut. In case of the indirect item | |
1538 | free unformatted nodes which are pointed to by the cut | |
1539 | pointers. */ | |
1540 | ||
ee93961b | 1541 | mode = |
d68caa95 | 1542 | prepare_for_delete_or_cut(th, inode, path, |
ee93961b JM |
1543 | item_key, &removed, |
1544 | &cut_size, new_file_size); | |
1545 | if (mode == M_CONVERT) { | |
bd4c625c LT |
1546 | /* convert last unformatted node to direct item or leave |
1547 | tail in the unformatted node */ | |
ee93961b | 1548 | RFALSE(ret_value != CARRY_ON, |
bd4c625c LT |
1549 | "PAP-5570: can not convert twice"); |
1550 | ||
ee93961b | 1551 | ret_value = |
995c762e | 1552 | maybe_indirect_to_direct(th, inode, page, |
d68caa95 | 1553 | path, item_key, |
ee93961b JM |
1554 | new_file_size, &mode); |
1555 | if (mode == M_SKIP_BALANCING) | |
bd4c625c | 1556 | /* tail has been left in the unformatted node */ |
ee93961b | 1557 | return ret_value; |
bd4c625c | 1558 | |
ee93961b | 1559 | is_inode_locked = 1; |
bd4c625c LT |
1560 | |
1561 | /* removing of last unformatted node will change value we | |
1562 | have to return to truncate. Save it */ | |
ee93961b JM |
1563 | retval2 = ret_value; |
1564 | /*retval2 = sb->s_blocksize - (new_file_size & (sb->s_blocksize - 1)); */ | |
bd4c625c LT |
1565 | |
1566 | /* So, we have performed the first part of the conversion: | |
1567 | inserting the new direct item. Now we are removing the | |
1568 | last unformatted node pointer. Set key to search for | |
1569 | it. */ | |
d68caa95 JM |
1570 | set_cpu_key_k_type(item_key, TYPE_INDIRECT); |
1571 | item_key->key_length = 4; | |
ee93961b JM |
1572 | new_file_size -= |
1573 | (new_file_size & (sb->s_blocksize - 1)); | |
1574 | tail_pos = new_file_size; | |
1575 | set_cpu_key_k_offset(item_key, new_file_size + 1); | |
bd4c625c | 1576 | if (search_for_position_by_key |
d68caa95 JM |
1577 | (sb, item_key, |
1578 | path) == POSITION_NOT_FOUND) { | |
1579 | print_block(PATH_PLAST_BUFFER(path), 3, | |
1580 | PATH_LAST_POSITION(path) - 1, | |
1581 | PATH_LAST_POSITION(path) + 1); | |
a9dd3643 | 1582 | reiserfs_panic(sb, "PAP-5580", "item to " |
c3a9c210 | 1583 | "convert does not exist (%K)", |
d68caa95 | 1584 | item_key); |
bd4c625c LT |
1585 | } |
1586 | continue; | |
1587 | } | |
ee93961b | 1588 | if (cut_size == 0) { |
d68caa95 | 1589 | pathrelse(path); |
bd4c625c LT |
1590 | return 0; |
1591 | } | |
1592 | ||
ee93961b | 1593 | s_cut_balance.insert_size[0] = cut_size; |
bd4c625c | 1594 | |
ee93961b JM |
1595 | ret_value = fix_nodes(mode, &s_cut_balance, NULL, NULL); |
1596 | if (ret_value != REPEAT_SEARCH) | |
bd4c625c LT |
1597 | break; |
1598 | ||
a9dd3643 | 1599 | PROC_INFO_INC(sb, cut_from_item_restarted); |
bd4c625c | 1600 | |
ee93961b | 1601 | ret_value = |
d68caa95 | 1602 | search_for_position_by_key(sb, item_key, path); |
ee93961b | 1603 | if (ret_value == POSITION_FOUND) |
bd4c625c | 1604 | continue; |
1da177e4 | 1605 | |
a9dd3643 | 1606 | reiserfs_warning(sb, "PAP-5610", "item %K not found", |
d68caa95 | 1607 | item_key); |
bd4c625c | 1608 | unfix_nodes(&s_cut_balance); |
ee93961b | 1609 | return (ret_value == IO_ERROR) ? -EIO : -ENOENT; |
bd4c625c LT |
1610 | } /* while */ |
1611 | ||
1612 | // check fix_nodes results (IO_ERROR or NO_DISK_SPACE) | |
ee93961b JM |
1613 | if (ret_value != CARRY_ON) { |
1614 | if (is_inode_locked) { | |
bd4c625c LT |
1615 | // FIXME: this seems to be not needed: we are always able |
1616 | // to cut item | |
d68caa95 | 1617 | indirect_to_direct_roll_back(th, inode, path); |
bd4c625c | 1618 | } |
ee93961b | 1619 | if (ret_value == NO_DISK_SPACE) |
a9dd3643 | 1620 | reiserfs_warning(sb, "reiserfs-5092", |
45b03d5e | 1621 | "NO_DISK_SPACE"); |
bd4c625c LT |
1622 | unfix_nodes(&s_cut_balance); |
1623 | return -EIO; | |
1da177e4 | 1624 | } |
bd4c625c LT |
1625 | |
1626 | /* go ahead and perform balancing */ | |
1627 | ||
ee93961b | 1628 | RFALSE(mode == M_PASTE || mode == M_INSERT, "invalid mode"); |
bd4c625c LT |
1629 | |
1630 | /* Calculate number of bytes that need to be cut from the item. */ | |
1631 | quota_cut_bytes = | |
ee93961b | 1632 | (mode == |
d68caa95 | 1633 | M_DELETE) ? ih_item_len(get_ih(path)) : -s_cut_balance. |
bd4c625c LT |
1634 | insert_size[0]; |
1635 | if (retval2 == -1) | |
ee93961b | 1636 | ret_value = calc_deleted_bytes_number(&s_cut_balance, mode); |
bd4c625c | 1637 | else |
ee93961b | 1638 | ret_value = retval2; |
bd4c625c LT |
1639 | |
1640 | /* For direct items, we only change the quota when deleting the last | |
1641 | ** item. | |
1642 | */ | |
1643 | p_le_ih = PATH_PITEM_HEAD(s_cut_balance.tb_path); | |
995c762e | 1644 | if (!S_ISLNK(inode->i_mode) && is_direct_le_ih(p_le_ih)) { |
ee93961b | 1645 | if (mode == M_DELETE && |
a9dd3643 | 1646 | (le_ih_k_offset(p_le_ih) & (sb->s_blocksize - 1)) == |
bd4c625c LT |
1647 | 1) { |
1648 | // FIXME: this is to keep 3.5 happy | |
995c762e | 1649 | REISERFS_I(inode)->i_first_direct_byte = U32_MAX; |
a9dd3643 | 1650 | quota_cut_bytes = sb->s_blocksize + UNFM_P_SIZE; |
bd4c625c LT |
1651 | } else { |
1652 | quota_cut_bytes = 0; | |
1653 | } | |
1da177e4 | 1654 | } |
1da177e4 | 1655 | #ifdef CONFIG_REISERFS_CHECK |
ee93961b | 1656 | if (is_inode_locked) { |
bd4c625c LT |
1657 | struct item_head *le_ih = |
1658 | PATH_PITEM_HEAD(s_cut_balance.tb_path); | |
1659 | /* we are going to complete indirect2direct conversion. Make | |
1660 | sure, that we exactly remove last unformatted node pointer | |
1661 | of the item */ | |
1662 | if (!is_indirect_le_ih(le_ih)) | |
a9dd3643 | 1663 | reiserfs_panic(sb, "vs-5652", |
bd4c625c LT |
1664 | "item must be indirect %h", le_ih); |
1665 | ||
ee93961b | 1666 | if (mode == M_DELETE && ih_item_len(le_ih) != UNFM_P_SIZE) |
a9dd3643 | 1667 | reiserfs_panic(sb, "vs-5653", "completing " |
c3a9c210 JM |
1668 | "indirect2direct conversion indirect " |
1669 | "item %h being deleted must be of " | |
1670 | "4 byte long", le_ih); | |
bd4c625c | 1671 | |
ee93961b | 1672 | if (mode == M_CUT |
bd4c625c | 1673 | && s_cut_balance.insert_size[0] != -UNFM_P_SIZE) { |
a9dd3643 | 1674 | reiserfs_panic(sb, "vs-5654", "can not complete " |
c3a9c210 JM |
1675 | "indirect2direct conversion of %h " |
1676 | "(CUT, insert_size==%d)", | |
bd4c625c LT |
1677 | le_ih, s_cut_balance.insert_size[0]); |
1678 | } | |
1679 | /* it would be useful to make sure, that right neighboring | |
1680 | item is direct item of this file */ | |
1da177e4 | 1681 | } |
1da177e4 | 1682 | #endif |
bd4c625c | 1683 | |
ee93961b JM |
1684 | do_balance(&s_cut_balance, NULL, NULL, mode); |
1685 | if (is_inode_locked) { | |
bd4c625c LT |
1686 | /* we've done an indirect->direct conversion. when the data block |
1687 | ** was freed, it was removed from the list of blocks that must | |
1688 | ** be flushed before the transaction commits, make sure to | |
1689 | ** unmap and invalidate it | |
1690 | */ | |
1691 | unmap_buffers(page, tail_pos); | |
995c762e | 1692 | REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask; |
bd4c625c | 1693 | } |
1da177e4 | 1694 | #ifdef REISERQUOTA_DEBUG |
995c762e | 1695 | reiserfs_debug(inode->i_sb, REISERFS_DEBUG_CODE, |
bd4c625c | 1696 | "reiserquota cut_from_item(): freeing %u id=%u type=%c", |
995c762e | 1697 | quota_cut_bytes, inode->i_uid, '?'); |
1da177e4 | 1698 | #endif |
e1c50248 | 1699 | vfs_dq_free_space_nodirty(inode, quota_cut_bytes); |
ee93961b | 1700 | return ret_value; |
1da177e4 LT |
1701 | } |
1702 | ||
bd4c625c LT |
1703 | static void truncate_directory(struct reiserfs_transaction_handle *th, |
1704 | struct inode *inode) | |
1da177e4 | 1705 | { |
bd4c625c LT |
1706 | BUG_ON(!th->t_trans_id); |
1707 | if (inode->i_nlink) | |
0030b645 | 1708 | reiserfs_error(inode->i_sb, "vs-5655", "link count != 0"); |
bd4c625c LT |
1709 | |
1710 | set_le_key_k_offset(KEY_FORMAT_3_5, INODE_PKEY(inode), DOT_OFFSET); | |
1711 | set_le_key_k_type(KEY_FORMAT_3_5, INODE_PKEY(inode), TYPE_DIRENTRY); | |
1712 | reiserfs_delete_solid_item(th, inode, INODE_PKEY(inode)); | |
1713 | reiserfs_update_sd(th, inode); | |
1714 | set_le_key_k_offset(KEY_FORMAT_3_5, INODE_PKEY(inode), SD_OFFSET); | |
1715 | set_le_key_k_type(KEY_FORMAT_3_5, INODE_PKEY(inode), TYPE_STAT_DATA); | |
1da177e4 LT |
1716 | } |
1717 | ||
bd4c625c LT |
1718 | /* Truncate file to the new size. Note, this must be called with a transaction |
1719 | already started */ | |
995c762e JM |
1720 | int reiserfs_do_truncate(struct reiserfs_transaction_handle *th, |
1721 | struct inode *inode, /* ->i_size contains new size */ | |
bd4c625c LT |
1722 | struct page *page, /* up to date for last block */ |
1723 | int update_timestamps /* when it is called by | |
1724 | file_release to convert | |
1725 | the tail - no timestamps | |
1726 | should be updated */ | |
1727 | ) | |
1728 | { | |
1729 | INITIALIZE_PATH(s_search_path); /* Path to the current object item. */ | |
1730 | struct item_head *p_le_ih; /* Pointer to an item header. */ | |
1731 | struct cpu_key s_item_key; /* Key to search for a previous file item. */ | |
ee93961b JM |
1732 | loff_t file_size, /* Old file size. */ |
1733 | new_file_size; /* New file size. */ | |
1734 | int deleted; /* Number of deleted or truncated bytes. */ | |
bd4c625c LT |
1735 | int retval; |
1736 | int err = 0; | |
1737 | ||
1738 | BUG_ON(!th->t_trans_id); | |
1739 | if (! | |
995c762e JM |
1740 | (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) |
1741 | || S_ISLNK(inode->i_mode))) | |
bd4c625c LT |
1742 | return 0; |
1743 | ||
995c762e | 1744 | if (S_ISDIR(inode->i_mode)) { |
bd4c625c | 1745 | // deletion of directory - no need to update timestamps |
995c762e | 1746 | truncate_directory(th, inode); |
bd4c625c LT |
1747 | return 0; |
1748 | } | |
1da177e4 | 1749 | |
bd4c625c | 1750 | /* Get new file size. */ |
ee93961b | 1751 | new_file_size = inode->i_size; |
1da177e4 | 1752 | |
bd4c625c | 1753 | // FIXME: note, that key type is unimportant here |
995c762e | 1754 | make_cpu_key(&s_item_key, inode, max_reiserfs_offset(inode), |
bd4c625c | 1755 | TYPE_DIRECT, 3); |
1da177e4 | 1756 | |
bd4c625c | 1757 | retval = |
995c762e | 1758 | search_for_position_by_key(inode->i_sb, &s_item_key, |
bd4c625c LT |
1759 | &s_search_path); |
1760 | if (retval == IO_ERROR) { | |
995c762e | 1761 | reiserfs_error(inode->i_sb, "vs-5657", |
0030b645 JM |
1762 | "i/o failure occurred trying to truncate %K", |
1763 | &s_item_key); | |
bd4c625c LT |
1764 | err = -EIO; |
1765 | goto out; | |
1766 | } | |
1767 | if (retval == POSITION_FOUND || retval == FILE_NOT_FOUND) { | |
995c762e | 1768 | reiserfs_error(inode->i_sb, "PAP-5660", |
0030b645 JM |
1769 | "wrong result %d of search for %K", retval, |
1770 | &s_item_key); | |
bd4c625c LT |
1771 | |
1772 | err = -EIO; | |
1773 | goto out; | |
1774 | } | |
1da177e4 | 1775 | |
bd4c625c LT |
1776 | s_search_path.pos_in_item--; |
1777 | ||
1778 | /* Get real file size (total length of all file items) */ | |
1779 | p_le_ih = PATH_PITEM_HEAD(&s_search_path); | |
1780 | if (is_statdata_le_ih(p_le_ih)) | |
ee93961b | 1781 | file_size = 0; |
bd4c625c LT |
1782 | else { |
1783 | loff_t offset = le_ih_k_offset(p_le_ih); | |
1784 | int bytes = | |
995c762e | 1785 | op_bytes_number(p_le_ih, inode->i_sb->s_blocksize); |
bd4c625c LT |
1786 | |
1787 | /* this may mismatch with real file size: if last direct item | |
1788 | had no padding zeros and last unformatted node had no free | |
1789 | space, this file would have this file size */ | |
ee93961b | 1790 | file_size = offset + bytes - 1; |
bd4c625c LT |
1791 | } |
1792 | /* | |
1793 | * are we doing a full truncate or delete, if so | |
1794 | * kick in the reada code | |
1795 | */ | |
ee93961b | 1796 | if (new_file_size == 0) |
bd4c625c LT |
1797 | s_search_path.reada = PATH_READA | PATH_READA_BACK; |
1798 | ||
ee93961b | 1799 | if (file_size == 0 || file_size < new_file_size) { |
bd4c625c | 1800 | goto update_and_out; |
1da177e4 LT |
1801 | } |
1802 | ||
bd4c625c | 1803 | /* Update key to search for the last file item. */ |
ee93961b | 1804 | set_cpu_key_k_offset(&s_item_key, file_size); |
bd4c625c LT |
1805 | |
1806 | do { | |
1807 | /* Cut or delete file item. */ | |
ee93961b | 1808 | deleted = |
bd4c625c | 1809 | reiserfs_cut_from_item(th, &s_search_path, &s_item_key, |
ee93961b JM |
1810 | inode, page, new_file_size); |
1811 | if (deleted < 0) { | |
995c762e | 1812 | reiserfs_warning(inode->i_sb, "vs-5665", |
45b03d5e | 1813 | "reiserfs_cut_from_item failed"); |
bd4c625c LT |
1814 | reiserfs_check_path(&s_search_path); |
1815 | return 0; | |
1816 | } | |
1da177e4 | 1817 | |
ee93961b | 1818 | RFALSE(deleted > file_size, |
bd4c625c | 1819 | "PAP-5670: reiserfs_cut_from_item: too many bytes deleted: deleted %d, file_size %lu, item_key %K", |
ee93961b | 1820 | deleted, file_size, &s_item_key); |
1da177e4 | 1821 | |
bd4c625c | 1822 | /* Change key to search the last file item. */ |
ee93961b | 1823 | file_size -= deleted; |
1da177e4 | 1824 | |
ee93961b | 1825 | set_cpu_key_k_offset(&s_item_key, file_size); |
1da177e4 | 1826 | |
bd4c625c LT |
1827 | /* While there are bytes to truncate and previous file item is presented in the tree. */ |
1828 | ||
1829 | /* | |
0222e657 | 1830 | ** This loop could take a really long time, and could log |
bd4c625c LT |
1831 | ** many more blocks than a transaction can hold. So, we do a polite |
1832 | ** journal end here, and if the transaction needs ending, we make | |
1833 | ** sure the file is consistent before ending the current trans | |
1834 | ** and starting a new one | |
1835 | */ | |
23f9e0f8 AZ |
1836 | if (journal_transaction_should_end(th, 0) || |
1837 | reiserfs_transaction_free_space(th) <= JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD) { | |
bd4c625c | 1838 | int orig_len_alloc = th->t_blocks_allocated; |
3cd6dbe6 | 1839 | pathrelse(&s_search_path); |
bd4c625c LT |
1840 | |
1841 | if (update_timestamps) { | |
995c762e JM |
1842 | inode->i_mtime = CURRENT_TIME_SEC; |
1843 | inode->i_ctime = CURRENT_TIME_SEC; | |
bd4c625c | 1844 | } |
995c762e | 1845 | reiserfs_update_sd(th, inode); |
bd4c625c | 1846 | |
995c762e | 1847 | err = journal_end(th, inode->i_sb, orig_len_alloc); |
bd4c625c LT |
1848 | if (err) |
1849 | goto out; | |
995c762e | 1850 | err = journal_begin(th, inode->i_sb, |
23f9e0f8 | 1851 | JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD + JOURNAL_PER_BALANCE_CNT * 4) ; |
bd4c625c LT |
1852 | if (err) |
1853 | goto out; | |
995c762e | 1854 | reiserfs_update_inode_transaction(inode); |
bd4c625c | 1855 | } |
ee93961b | 1856 | } while (file_size > ROUND_UP(new_file_size) && |
995c762e | 1857 | search_for_position_by_key(inode->i_sb, &s_item_key, |
bd4c625c LT |
1858 | &s_search_path) == POSITION_FOUND); |
1859 | ||
ee93961b | 1860 | RFALSE(file_size > ROUND_UP(new_file_size), |
bd4c625c | 1861 | "PAP-5680: truncate did not finish: new_file_size %Ld, current %Ld, oid %d", |
ee93961b | 1862 | new_file_size, file_size, s_item_key.on_disk_key.k_objectid); |
bd4c625c LT |
1863 | |
1864 | update_and_out: | |
1865 | if (update_timestamps) { | |
1866 | // this is truncate, not file closing | |
995c762e JM |
1867 | inode->i_mtime = CURRENT_TIME_SEC; |
1868 | inode->i_ctime = CURRENT_TIME_SEC; | |
1da177e4 | 1869 | } |
995c762e | 1870 | reiserfs_update_sd(th, inode); |
1da177e4 | 1871 | |
bd4c625c LT |
1872 | out: |
1873 | pathrelse(&s_search_path); | |
1874 | return err; | |
1875 | } | |
1da177e4 LT |
1876 | |
1877 | #ifdef CONFIG_REISERFS_CHECK | |
1878 | // this makes sure, that we __append__, not overwrite or add holes | |
fec6d055 | 1879 | static void check_research_for_paste(struct treepath *path, |
d68caa95 | 1880 | const struct cpu_key *key) |
1da177e4 | 1881 | { |
bd4c625c LT |
1882 | struct item_head *found_ih = get_ih(path); |
1883 | ||
1884 | if (is_direct_le_ih(found_ih)) { | |
1885 | if (le_ih_k_offset(found_ih) + | |
1886 | op_bytes_number(found_ih, | |
1887 | get_last_bh(path)->b_size) != | |
d68caa95 | 1888 | cpu_key_k_offset(key) |
bd4c625c LT |
1889 | || op_bytes_number(found_ih, |
1890 | get_last_bh(path)->b_size) != | |
1891 | pos_in_item(path)) | |
c3a9c210 JM |
1892 | reiserfs_panic(NULL, "PAP-5720", "found direct item " |
1893 | "%h or position (%d) does not match " | |
1894 | "to key %K", found_ih, | |
d68caa95 | 1895 | pos_in_item(path), key); |
bd4c625c LT |
1896 | } |
1897 | if (is_indirect_le_ih(found_ih)) { | |
1898 | if (le_ih_k_offset(found_ih) + | |
1899 | op_bytes_number(found_ih, | |
1900 | get_last_bh(path)->b_size) != | |
d68caa95 | 1901 | cpu_key_k_offset(key) |
bd4c625c LT |
1902 | || I_UNFM_NUM(found_ih) != pos_in_item(path) |
1903 | || get_ih_free_space(found_ih) != 0) | |
c3a9c210 JM |
1904 | reiserfs_panic(NULL, "PAP-5730", "found indirect " |
1905 | "item (%h) or position (%d) does not " | |
1906 | "match to key (%K)", | |
d68caa95 | 1907 | found_ih, pos_in_item(path), key); |
bd4c625c | 1908 | } |
1da177e4 | 1909 | } |
bd4c625c | 1910 | #endif /* config reiserfs check */ |
1da177e4 LT |
1911 | |
1912 | /* Paste bytes to the existing item. Returns bytes number pasted into the item. */ | |
d68caa95 JM |
1913 | int reiserfs_paste_into_item(struct reiserfs_transaction_handle *th, struct treepath *search_path, /* Path to the pasted item. */ |
1914 | const struct cpu_key *key, /* Key to search for the needed item. */ | |
bd4c625c | 1915 | struct inode *inode, /* Inode item belongs to */ |
d68caa95 | 1916 | const char *body, /* Pointer to the bytes to paste. */ |
ee93961b | 1917 | int pasted_size) |
bd4c625c LT |
1918 | { /* Size of pasted bytes. */ |
1919 | struct tree_balance s_paste_balance; | |
1920 | int retval; | |
1921 | int fs_gen; | |
1922 | ||
1923 | BUG_ON(!th->t_trans_id); | |
1da177e4 | 1924 | |
bd4c625c | 1925 | fs_gen = get_generation(inode->i_sb); |
1da177e4 LT |
1926 | |
1927 | #ifdef REISERQUOTA_DEBUG | |
bd4c625c LT |
1928 | reiserfs_debug(inode->i_sb, REISERFS_DEBUG_CODE, |
1929 | "reiserquota paste_into_item(): allocating %u id=%u type=%c", | |
ee93961b | 1930 | pasted_size, inode->i_uid, |
d68caa95 | 1931 | key2type(&(key->on_disk_key))); |
1da177e4 LT |
1932 | #endif |
1933 | ||
e1c50248 | 1934 | if (vfs_dq_alloc_space_nodirty(inode, pasted_size)) { |
d68caa95 | 1935 | pathrelse(search_path); |
bd4c625c LT |
1936 | return -EDQUOT; |
1937 | } | |
d68caa95 | 1938 | init_tb_struct(th, &s_paste_balance, th->t_super, search_path, |
ee93961b | 1939 | pasted_size); |
1da177e4 | 1940 | #ifdef DISPLACE_NEW_PACKING_LOCALITIES |
d68caa95 | 1941 | s_paste_balance.key = key->on_disk_key; |
1da177e4 LT |
1942 | #endif |
1943 | ||
bd4c625c LT |
1944 | /* DQUOT_* can schedule, must check before the fix_nodes */ |
1945 | if (fs_changed(fs_gen, inode->i_sb)) { | |
1946 | goto search_again; | |
1da177e4 | 1947 | } |
bd4c625c LT |
1948 | |
1949 | while ((retval = | |
1950 | fix_nodes(M_PASTE, &s_paste_balance, NULL, | |
d68caa95 | 1951 | body)) == REPEAT_SEARCH) { |
bd4c625c LT |
1952 | search_again: |
1953 | /* file system changed while we were in the fix_nodes */ | |
1954 | PROC_INFO_INC(th->t_super, paste_into_item_restarted); | |
1955 | retval = | |
d68caa95 JM |
1956 | search_for_position_by_key(th->t_super, key, |
1957 | search_path); | |
bd4c625c LT |
1958 | if (retval == IO_ERROR) { |
1959 | retval = -EIO; | |
1960 | goto error_out; | |
1961 | } | |
1962 | if (retval == POSITION_FOUND) { | |
45b03d5e JM |
1963 | reiserfs_warning(inode->i_sb, "PAP-5710", |
1964 | "entry or pasted byte (%K) exists", | |
d68caa95 | 1965 | key); |
bd4c625c LT |
1966 | retval = -EEXIST; |
1967 | goto error_out; | |
1968 | } | |
1da177e4 | 1969 | #ifdef CONFIG_REISERFS_CHECK |
d68caa95 | 1970 | check_research_for_paste(search_path, key); |
1da177e4 | 1971 | #endif |
bd4c625c | 1972 | } |
1da177e4 | 1973 | |
bd4c625c LT |
1974 | /* Perform balancing after all resources are collected by fix_nodes, and |
1975 | accessing them will not risk triggering schedule. */ | |
1976 | if (retval == CARRY_ON) { | |
d68caa95 | 1977 | do_balance(&s_paste_balance, NULL /*ih */ , body, M_PASTE); |
bd4c625c LT |
1978 | return 0; |
1979 | } | |
1980 | retval = (retval == NO_DISK_SPACE) ? -ENOSPC : -EIO; | |
1981 | error_out: | |
1982 | /* this also releases the path */ | |
1983 | unfix_nodes(&s_paste_balance); | |
1da177e4 | 1984 | #ifdef REISERQUOTA_DEBUG |
bd4c625c LT |
1985 | reiserfs_debug(inode->i_sb, REISERFS_DEBUG_CODE, |
1986 | "reiserquota paste_into_item(): freeing %u id=%u type=%c", | |
ee93961b | 1987 | pasted_size, inode->i_uid, |
d68caa95 | 1988 | key2type(&(key->on_disk_key))); |
1da177e4 | 1989 | #endif |
e1c50248 | 1990 | vfs_dq_free_space_nodirty(inode, pasted_size); |
bd4c625c | 1991 | return retval; |
1da177e4 LT |
1992 | } |
1993 | ||
d68caa95 JM |
1994 | /* Insert new item into the buffer at the path. |
1995 | * th - active transaction handle | |
1996 | * path - path to the inserted item | |
1997 | * ih - pointer to the item header to insert | |
1998 | * body - pointer to the bytes to insert | |
1999 | */ | |
2000 | int reiserfs_insert_item(struct reiserfs_transaction_handle *th, | |
2001 | struct treepath *path, const struct cpu_key *key, | |
2002 | struct item_head *ih, struct inode *inode, | |
2003 | const char *body) | |
2004 | { | |
bd4c625c LT |
2005 | struct tree_balance s_ins_balance; |
2006 | int retval; | |
2007 | int fs_gen = 0; | |
2008 | int quota_bytes = 0; | |
2009 | ||
2010 | BUG_ON(!th->t_trans_id); | |
2011 | ||
2012 | if (inode) { /* Do we count quotas for item? */ | |
2013 | fs_gen = get_generation(inode->i_sb); | |
d68caa95 | 2014 | quota_bytes = ih_item_len(ih); |
bd4c625c LT |
2015 | |
2016 | /* hack so the quota code doesn't have to guess if the file has | |
2017 | ** a tail, links are always tails, so there's no guessing needed | |
2018 | */ | |
d68caa95 | 2019 | if (!S_ISLNK(inode->i_mode) && is_direct_le_ih(ih)) |
bd4c625c | 2020 | quota_bytes = inode->i_sb->s_blocksize + UNFM_P_SIZE; |
1da177e4 | 2021 | #ifdef REISERQUOTA_DEBUG |
bd4c625c LT |
2022 | reiserfs_debug(inode->i_sb, REISERFS_DEBUG_CODE, |
2023 | "reiserquota insert_item(): allocating %u id=%u type=%c", | |
d68caa95 | 2024 | quota_bytes, inode->i_uid, head2type(ih)); |
1da177e4 | 2025 | #endif |
bd4c625c LT |
2026 | /* We can't dirty inode here. It would be immediately written but |
2027 | * appropriate stat item isn't inserted yet... */ | |
77db4f25 | 2028 | if (vfs_dq_alloc_space_nodirty(inode, quota_bytes)) { |
d68caa95 | 2029 | pathrelse(path); |
bd4c625c LT |
2030 | return -EDQUOT; |
2031 | } | |
1da177e4 | 2032 | } |
d68caa95 JM |
2033 | init_tb_struct(th, &s_ins_balance, th->t_super, path, |
2034 | IH_SIZE + ih_item_len(ih)); | |
1da177e4 | 2035 | #ifdef DISPLACE_NEW_PACKING_LOCALITIES |
bd4c625c | 2036 | s_ins_balance.key = key->on_disk_key; |
1da177e4 | 2037 | #endif |
bd4c625c LT |
2038 | /* DQUOT_* can schedule, must check to be sure calling fix_nodes is safe */ |
2039 | if (inode && fs_changed(fs_gen, inode->i_sb)) { | |
2040 | goto search_again; | |
1da177e4 | 2041 | } |
bd4c625c LT |
2042 | |
2043 | while ((retval = | |
d68caa95 JM |
2044 | fix_nodes(M_INSERT, &s_ins_balance, ih, |
2045 | body)) == REPEAT_SEARCH) { | |
bd4c625c LT |
2046 | search_again: |
2047 | /* file system changed while we were in the fix_nodes */ | |
2048 | PROC_INFO_INC(th->t_super, insert_item_restarted); | |
d68caa95 | 2049 | retval = search_item(th->t_super, key, path); |
bd4c625c LT |
2050 | if (retval == IO_ERROR) { |
2051 | retval = -EIO; | |
2052 | goto error_out; | |
2053 | } | |
2054 | if (retval == ITEM_FOUND) { | |
45b03d5e | 2055 | reiserfs_warning(th->t_super, "PAP-5760", |
bd4c625c LT |
2056 | "key %K already exists in the tree", |
2057 | key); | |
2058 | retval = -EEXIST; | |
2059 | goto error_out; | |
2060 | } | |
1da177e4 | 2061 | } |
1da177e4 | 2062 | |
bd4c625c LT |
2063 | /* make balancing after all resources will be collected at a time */ |
2064 | if (retval == CARRY_ON) { | |
d68caa95 | 2065 | do_balance(&s_ins_balance, ih, body, M_INSERT); |
bd4c625c LT |
2066 | return 0; |
2067 | } | |
1da177e4 | 2068 | |
bd4c625c LT |
2069 | retval = (retval == NO_DISK_SPACE) ? -ENOSPC : -EIO; |
2070 | error_out: | |
2071 | /* also releases the path */ | |
2072 | unfix_nodes(&s_ins_balance); | |
1da177e4 | 2073 | #ifdef REISERQUOTA_DEBUG |
bd4c625c LT |
2074 | reiserfs_debug(th->t_super, REISERFS_DEBUG_CODE, |
2075 | "reiserquota insert_item(): freeing %u id=%u type=%c", | |
d68caa95 | 2076 | quota_bytes, inode->i_uid, head2type(ih)); |
1da177e4 | 2077 | #endif |
bd4c625c | 2078 | if (inode) |
77db4f25 | 2079 | vfs_dq_free_space_nodirty(inode, quota_bytes); |
bd4c625c | 2080 | return retval; |
1da177e4 | 2081 | } |