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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 | |
26 | * decrement_counters_in_path | |
27 | * reiserfs_check_path | |
28 | * pathrelse_and_restore | |
29 | * pathrelse | |
30 | * search_by_key_reada | |
31 | * search_by_key | |
32 | * search_for_position_by_key | |
33 | * comp_items | |
34 | * prepare_for_direct_item | |
35 | * prepare_for_direntry_item | |
36 | * prepare_for_delete_or_cut | |
37 | * calc_deleted_bytes_number | |
38 | * init_tb_struct | |
39 | * padd_item | |
40 | * reiserfs_delete_item | |
41 | * reiserfs_delete_solid_item | |
42 | * reiserfs_delete_object | |
43 | * maybe_indirect_to_direct | |
44 | * indirect_to_direct_roll_back | |
45 | * reiserfs_cut_from_item | |
46 | * truncate_directory | |
47 | * reiserfs_do_truncate | |
48 | * reiserfs_paste_into_item | |
49 | * reiserfs_insert_item | |
50 | */ | |
51 | ||
1da177e4 LT |
52 | #include <linux/time.h> |
53 | #include <linux/string.h> | |
54 | #include <linux/pagemap.h> | |
55 | #include <linux/reiserfs_fs.h> | |
1da177e4 LT |
56 | #include <linux/buffer_head.h> |
57 | #include <linux/quotaops.h> | |
58 | ||
59 | /* Does the buffer contain a disk block which is in the tree. */ | |
bd4c625c | 60 | inline int B_IS_IN_TREE(const struct buffer_head *p_s_bh) |
1da177e4 LT |
61 | { |
62 | ||
bd4c625c LT |
63 | RFALSE(B_LEVEL(p_s_bh) > MAX_HEIGHT, |
64 | "PAP-1010: block (%b) has too big level (%z)", p_s_bh, p_s_bh); | |
1da177e4 | 65 | |
bd4c625c | 66 | return (B_LEVEL(p_s_bh) != FREE_LEVEL); |
1da177e4 LT |
67 | } |
68 | ||
69 | // | |
70 | // to gets item head in le form | |
71 | // | |
bd4c625c LT |
72 | inline void copy_item_head(struct item_head *p_v_to, |
73 | const struct item_head *p_v_from) | |
1da177e4 | 74 | { |
bd4c625c | 75 | memcpy(p_v_to, p_v_from, IH_SIZE); |
1da177e4 LT |
76 | } |
77 | ||
1da177e4 LT |
78 | /* k1 is pointer to on-disk structure which is stored in little-endian |
79 | form. k2 is pointer to cpu variable. For key of items of the same | |
80 | object this returns 0. | |
81 | Returns: -1 if key1 < key2 | |
82 | 0 if key1 == key2 | |
83 | 1 if key1 > key2 */ | |
bd4c625c LT |
84 | inline int comp_short_keys(const struct reiserfs_key *le_key, |
85 | const struct cpu_key *cpu_key) | |
1da177e4 | 86 | { |
bd4c625c LT |
87 | __u32 n; |
88 | n = le32_to_cpu(le_key->k_dir_id); | |
89 | if (n < cpu_key->on_disk_key.k_dir_id) | |
90 | return -1; | |
91 | if (n > cpu_key->on_disk_key.k_dir_id) | |
92 | return 1; | |
93 | n = le32_to_cpu(le_key->k_objectid); | |
94 | if (n < cpu_key->on_disk_key.k_objectid) | |
95 | return -1; | |
96 | if (n > cpu_key->on_disk_key.k_objectid) | |
97 | return 1; | |
98 | return 0; | |
1da177e4 LT |
99 | } |
100 | ||
1da177e4 LT |
101 | /* k1 is pointer to on-disk structure which is stored in little-endian |
102 | form. k2 is pointer to cpu variable. | |
103 | Compare keys using all 4 key fields. | |
104 | Returns: -1 if key1 < key2 0 | |
105 | if key1 = key2 1 if key1 > key2 */ | |
bd4c625c LT |
106 | static inline int comp_keys(const struct reiserfs_key *le_key, |
107 | const struct cpu_key *cpu_key) | |
1da177e4 | 108 | { |
bd4c625c LT |
109 | int retval; |
110 | ||
111 | retval = comp_short_keys(le_key, cpu_key); | |
112 | if (retval) | |
113 | return retval; | |
114 | if (le_key_k_offset(le_key_version(le_key), le_key) < | |
115 | cpu_key_k_offset(cpu_key)) | |
116 | return -1; | |
117 | if (le_key_k_offset(le_key_version(le_key), le_key) > | |
118 | cpu_key_k_offset(cpu_key)) | |
119 | return 1; | |
120 | ||
121 | if (cpu_key->key_length == 3) | |
122 | return 0; | |
123 | ||
124 | /* this part is needed only when tail conversion is in progress */ | |
125 | if (le_key_k_type(le_key_version(le_key), le_key) < | |
126 | cpu_key_k_type(cpu_key)) | |
127 | return -1; | |
128 | ||
129 | if (le_key_k_type(le_key_version(le_key), le_key) > | |
130 | cpu_key_k_type(cpu_key)) | |
131 | return 1; | |
1da177e4 | 132 | |
bd4c625c | 133 | return 0; |
1da177e4 LT |
134 | } |
135 | ||
bd4c625c LT |
136 | inline int comp_short_le_keys(const struct reiserfs_key *key1, |
137 | const struct reiserfs_key *key2) | |
1da177e4 | 138 | { |
bd4c625c LT |
139 | __u32 *p_s_1_u32, *p_s_2_u32; |
140 | int n_key_length = REISERFS_SHORT_KEY_LEN; | |
141 | ||
142 | p_s_1_u32 = (__u32 *) key1; | |
143 | p_s_2_u32 = (__u32 *) key2; | |
144 | for (; n_key_length--; ++p_s_1_u32, ++p_s_2_u32) { | |
145 | if (le32_to_cpu(*p_s_1_u32) < le32_to_cpu(*p_s_2_u32)) | |
146 | return -1; | |
147 | if (le32_to_cpu(*p_s_1_u32) > le32_to_cpu(*p_s_2_u32)) | |
148 | return 1; | |
149 | } | |
150 | return 0; | |
1da177e4 LT |
151 | } |
152 | ||
bd4c625c | 153 | inline void le_key2cpu_key(struct cpu_key *to, const struct reiserfs_key *from) |
1da177e4 | 154 | { |
bd4c625c LT |
155 | int version; |
156 | to->on_disk_key.k_dir_id = le32_to_cpu(from->k_dir_id); | |
157 | to->on_disk_key.k_objectid = le32_to_cpu(from->k_objectid); | |
158 | ||
159 | // find out version of the key | |
160 | version = le_key_version(from); | |
161 | to->version = version; | |
162 | to->on_disk_key.k_offset = le_key_k_offset(version, from); | |
163 | to->on_disk_key.k_type = le_key_k_type(version, from); | |
1da177e4 LT |
164 | } |
165 | ||
1da177e4 LT |
166 | // this does not say which one is bigger, it only returns 1 if keys |
167 | // are not equal, 0 otherwise | |
bd4c625c LT |
168 | inline int comp_le_keys(const struct reiserfs_key *k1, |
169 | const struct reiserfs_key *k2) | |
1da177e4 | 170 | { |
bd4c625c | 171 | return memcmp(k1, k2, sizeof(struct reiserfs_key)); |
1da177e4 LT |
172 | } |
173 | ||
174 | /************************************************************************** | |
175 | * Binary search toolkit function * | |
176 | * Search for an item in the array by the item key * | |
177 | * Returns: 1 if found, 0 if not found; * | |
178 | * *p_n_pos = number of the searched element if found, else the * | |
179 | * number of the first element that is larger than p_v_key. * | |
180 | **************************************************************************/ | |
181 | /* For those not familiar with binary search: n_lbound is the leftmost item that it | |
182 | could be, n_rbound the rightmost item that it could be. We examine the item | |
183 | halfway between n_lbound and n_rbound, and that tells us either that we can increase | |
184 | n_lbound, or decrease n_rbound, or that we have found it, or if n_lbound <= n_rbound that | |
185 | there are no possible items, and we have not found it. With each examination we | |
186 | cut the number of possible items it could be by one more than half rounded down, | |
187 | or we find it. */ | |
bd4c625c LT |
188 | static inline int bin_search(const void *p_v_key, /* Key to search for. */ |
189 | const void *p_v_base, /* First item in the array. */ | |
190 | int p_n_num, /* Number of items in the array. */ | |
191 | int p_n_width, /* Item size in the array. | |
192 | searched. Lest the reader be | |
193 | confused, note that this is crafted | |
194 | as a general function, and when it | |
195 | is applied specifically to the array | |
196 | of item headers in a node, p_n_width | |
197 | is actually the item header size not | |
198 | the item size. */ | |
199 | int *p_n_pos /* Number of the searched for element. */ | |
200 | ) | |
201 | { | |
202 | int n_rbound, n_lbound, n_j; | |
203 | ||
204 | for (n_j = ((n_rbound = p_n_num - 1) + (n_lbound = 0)) / 2; | |
205 | n_lbound <= n_rbound; n_j = (n_rbound + n_lbound) / 2) | |
206 | switch (comp_keys | |
207 | ((struct reiserfs_key *)((char *)p_v_base + | |
208 | n_j * p_n_width), | |
209 | (struct cpu_key *)p_v_key)) { | |
210 | case -1: | |
211 | n_lbound = n_j + 1; | |
212 | continue; | |
213 | case 1: | |
214 | n_rbound = n_j - 1; | |
215 | continue; | |
216 | case 0: | |
217 | *p_n_pos = n_j; | |
218 | return ITEM_FOUND; /* Key found in the array. */ | |
219 | } | |
220 | ||
221 | /* bin_search did not find given key, it returns position of key, | |
222 | that is minimal and greater than the given one. */ | |
223 | *p_n_pos = n_lbound; | |
224 | return ITEM_NOT_FOUND; | |
1da177e4 LT |
225 | } |
226 | ||
227 | #ifdef CONFIG_REISERFS_CHECK | |
bd4c625c | 228 | extern struct tree_balance *cur_tb; |
1da177e4 LT |
229 | #endif |
230 | ||
1da177e4 | 231 | /* Minimal possible key. It is never in the tree. */ |
bd4c625c | 232 | const struct reiserfs_key MIN_KEY = { 0, 0, {{0, 0},} }; |
1da177e4 LT |
233 | |
234 | /* Maximal possible key. It is never in the tree. */ | |
bd4c625c | 235 | static const struct reiserfs_key MAX_KEY = { |
3e8962be AV |
236 | __constant_cpu_to_le32(0xffffffff), |
237 | __constant_cpu_to_le32(0xffffffff), | |
238 | {{__constant_cpu_to_le32(0xffffffff), | |
bd4c625c | 239 | __constant_cpu_to_le32(0xffffffff)},} |
3e8962be | 240 | }; |
1da177e4 | 241 | |
1da177e4 LT |
242 | /* Get delimiting key of the buffer by looking for it in the buffers in the path, starting from the bottom |
243 | of the path, and going upwards. We must check the path's validity at each step. If the key is not in | |
244 | the path, there is no delimiting key in the tree (buffer is first or last buffer in tree), and in this | |
245 | case we return a special key, either MIN_KEY or MAX_KEY. */ | |
fec6d055 | 246 | static inline const struct reiserfs_key *get_lkey(const struct treepath |
bd4c625c LT |
247 | *p_s_chk_path, |
248 | const struct super_block | |
249 | *p_s_sb) | |
250 | { | |
251 | int n_position, n_path_offset = p_s_chk_path->path_length; | |
252 | struct buffer_head *p_s_parent; | |
253 | ||
254 | RFALSE(n_path_offset < FIRST_PATH_ELEMENT_OFFSET, | |
255 | "PAP-5010: invalid offset in the path"); | |
256 | ||
257 | /* While not higher in path than first element. */ | |
258 | while (n_path_offset-- > FIRST_PATH_ELEMENT_OFFSET) { | |
259 | ||
260 | RFALSE(!buffer_uptodate | |
261 | (PATH_OFFSET_PBUFFER(p_s_chk_path, n_path_offset)), | |
262 | "PAP-5020: parent is not uptodate"); | |
263 | ||
264 | /* Parent at the path is not in the tree now. */ | |
265 | if (!B_IS_IN_TREE | |
266 | (p_s_parent = | |
267 | PATH_OFFSET_PBUFFER(p_s_chk_path, n_path_offset))) | |
268 | return &MAX_KEY; | |
269 | /* Check whether position in the parent is correct. */ | |
270 | if ((n_position = | |
271 | PATH_OFFSET_POSITION(p_s_chk_path, | |
272 | n_path_offset)) > | |
273 | B_NR_ITEMS(p_s_parent)) | |
274 | return &MAX_KEY; | |
275 | /* Check whether parent at the path really points to the child. */ | |
276 | if (B_N_CHILD_NUM(p_s_parent, n_position) != | |
277 | PATH_OFFSET_PBUFFER(p_s_chk_path, | |
278 | n_path_offset + 1)->b_blocknr) | |
279 | return &MAX_KEY; | |
280 | /* Return delimiting key if position in the parent is not equal to zero. */ | |
281 | if (n_position) | |
282 | return B_N_PDELIM_KEY(p_s_parent, n_position - 1); | |
283 | } | |
284 | /* Return MIN_KEY if we are in the root of the buffer tree. */ | |
285 | if (PATH_OFFSET_PBUFFER(p_s_chk_path, FIRST_PATH_ELEMENT_OFFSET)-> | |
286 | b_blocknr == SB_ROOT_BLOCK(p_s_sb)) | |
287 | return &MIN_KEY; | |
288 | return &MAX_KEY; | |
1da177e4 LT |
289 | } |
290 | ||
1da177e4 | 291 | /* Get delimiting key of the buffer at the path and its right neighbor. */ |
fec6d055 | 292 | inline const struct reiserfs_key *get_rkey(const struct treepath *p_s_chk_path, |
bd4c625c LT |
293 | const struct super_block *p_s_sb) |
294 | { | |
295 | int n_position, n_path_offset = p_s_chk_path->path_length; | |
296 | struct buffer_head *p_s_parent; | |
297 | ||
298 | RFALSE(n_path_offset < FIRST_PATH_ELEMENT_OFFSET, | |
299 | "PAP-5030: invalid offset in the path"); | |
300 | ||
301 | while (n_path_offset-- > FIRST_PATH_ELEMENT_OFFSET) { | |
302 | ||
303 | RFALSE(!buffer_uptodate | |
304 | (PATH_OFFSET_PBUFFER(p_s_chk_path, n_path_offset)), | |
305 | "PAP-5040: parent is not uptodate"); | |
306 | ||
307 | /* Parent at the path is not in the tree now. */ | |
308 | if (!B_IS_IN_TREE | |
309 | (p_s_parent = | |
310 | PATH_OFFSET_PBUFFER(p_s_chk_path, n_path_offset))) | |
311 | return &MIN_KEY; | |
312 | /* Check whether position in the parent is correct. */ | |
313 | if ((n_position = | |
314 | PATH_OFFSET_POSITION(p_s_chk_path, | |
315 | n_path_offset)) > | |
316 | B_NR_ITEMS(p_s_parent)) | |
317 | return &MIN_KEY; | |
318 | /* Check whether parent at the path really points to the child. */ | |
319 | if (B_N_CHILD_NUM(p_s_parent, n_position) != | |
320 | PATH_OFFSET_PBUFFER(p_s_chk_path, | |
321 | n_path_offset + 1)->b_blocknr) | |
322 | return &MIN_KEY; | |
323 | /* Return delimiting key if position in the parent is not the last one. */ | |
324 | if (n_position != B_NR_ITEMS(p_s_parent)) | |
325 | return B_N_PDELIM_KEY(p_s_parent, n_position); | |
326 | } | |
327 | /* Return MAX_KEY if we are in the root of the buffer tree. */ | |
328 | if (PATH_OFFSET_PBUFFER(p_s_chk_path, FIRST_PATH_ELEMENT_OFFSET)-> | |
329 | b_blocknr == SB_ROOT_BLOCK(p_s_sb)) | |
330 | return &MAX_KEY; | |
331 | return &MIN_KEY; | |
1da177e4 LT |
332 | } |
333 | ||
1da177e4 LT |
334 | /* Check whether a key is contained in the tree rooted from a buffer at a path. */ |
335 | /* This works by looking at the left and right delimiting keys for the buffer in the last path_element in | |
336 | the path. These delimiting keys are stored at least one level above that buffer in the tree. If the | |
337 | buffer is the first or last node in the tree order then one of the delimiting keys may be absent, and in | |
338 | this case get_lkey and get_rkey return a special key which is MIN_KEY or MAX_KEY. */ | |
fec6d055 | 339 | static inline int key_in_buffer(struct treepath *p_s_chk_path, /* Path which should be checked. */ |
bd4c625c LT |
340 | const struct cpu_key *p_s_key, /* Key which should be checked. */ |
341 | struct super_block *p_s_sb /* Super block pointer. */ | |
342 | ) | |
343 | { | |
1da177e4 | 344 | |
bd4c625c LT |
345 | RFALSE(!p_s_key || p_s_chk_path->path_length < FIRST_PATH_ELEMENT_OFFSET |
346 | || p_s_chk_path->path_length > MAX_HEIGHT, | |
347 | "PAP-5050: pointer to the key(%p) is NULL or invalid path length(%d)", | |
348 | p_s_key, p_s_chk_path->path_length); | |
349 | RFALSE(!PATH_PLAST_BUFFER(p_s_chk_path)->b_bdev, | |
350 | "PAP-5060: device must not be NODEV"); | |
351 | ||
352 | if (comp_keys(get_lkey(p_s_chk_path, p_s_sb), p_s_key) == 1) | |
353 | /* left delimiting key is bigger, that the key we look for */ | |
354 | return 0; | |
355 | // if ( comp_keys(p_s_key, get_rkey(p_s_chk_path, p_s_sb)) != -1 ) | |
356 | if (comp_keys(get_rkey(p_s_chk_path, p_s_sb), p_s_key) != 1) | |
357 | /* p_s_key must be less than right delimitiing key */ | |
358 | return 0; | |
359 | return 1; | |
1da177e4 LT |
360 | } |
361 | ||
bd4c625c LT |
362 | inline void decrement_bcount(struct buffer_head *p_s_bh) |
363 | { | |
364 | if (p_s_bh) { | |
365 | if (atomic_read(&(p_s_bh->b_count))) { | |
366 | put_bh(p_s_bh); | |
367 | return; | |
368 | } | |
c3a9c210 JM |
369 | reiserfs_panic(NULL, "PAP-5070", |
370 | "trying to free free buffer %b", p_s_bh); | |
bd4c625c LT |
371 | } |
372 | } | |
1da177e4 LT |
373 | |
374 | /* Decrement b_count field of the all buffers in the path. */ | |
fec6d055 | 375 | void decrement_counters_in_path(struct treepath *p_s_search_path) |
bd4c625c LT |
376 | { |
377 | int n_path_offset = p_s_search_path->path_length; | |
378 | ||
379 | RFALSE(n_path_offset < ILLEGAL_PATH_ELEMENT_OFFSET || | |
380 | n_path_offset > EXTENDED_MAX_HEIGHT - 1, | |
381 | "PAP-5080: invalid path offset of %d", n_path_offset); | |
1da177e4 | 382 | |
bd4c625c LT |
383 | while (n_path_offset > ILLEGAL_PATH_ELEMENT_OFFSET) { |
384 | struct buffer_head *bh; | |
1da177e4 | 385 | |
bd4c625c LT |
386 | bh = PATH_OFFSET_PBUFFER(p_s_search_path, n_path_offset--); |
387 | decrement_bcount(bh); | |
388 | } | |
389 | p_s_search_path->path_length = ILLEGAL_PATH_ELEMENT_OFFSET; | |
1da177e4 LT |
390 | } |
391 | ||
fec6d055 | 392 | int reiserfs_check_path(struct treepath *p) |
bd4c625c LT |
393 | { |
394 | RFALSE(p->path_length != ILLEGAL_PATH_ELEMENT_OFFSET, | |
395 | "path not properly relsed"); | |
396 | return 0; | |
397 | } | |
1da177e4 LT |
398 | |
399 | /* Release all buffers in the path. Restore dirty bits clean | |
400 | ** when preparing the buffer for the log | |
401 | ** | |
402 | ** only called from fix_nodes() | |
403 | */ | |
fec6d055 | 404 | void pathrelse_and_restore(struct super_block *s, struct treepath *p_s_search_path) |
bd4c625c LT |
405 | { |
406 | int n_path_offset = p_s_search_path->path_length; | |
407 | ||
408 | RFALSE(n_path_offset < ILLEGAL_PATH_ELEMENT_OFFSET, | |
409 | "clm-4000: invalid path offset"); | |
410 | ||
411 | while (n_path_offset > ILLEGAL_PATH_ELEMENT_OFFSET) { | |
412 | reiserfs_restore_prepared_buffer(s, | |
413 | PATH_OFFSET_PBUFFER | |
414 | (p_s_search_path, | |
415 | n_path_offset)); | |
416 | brelse(PATH_OFFSET_PBUFFER(p_s_search_path, n_path_offset--)); | |
417 | } | |
418 | p_s_search_path->path_length = ILLEGAL_PATH_ELEMENT_OFFSET; | |
1da177e4 LT |
419 | } |
420 | ||
421 | /* Release all buffers in the path. */ | |
fec6d055 | 422 | void pathrelse(struct treepath *p_s_search_path) |
bd4c625c LT |
423 | { |
424 | int n_path_offset = p_s_search_path->path_length; | |
1da177e4 | 425 | |
bd4c625c LT |
426 | RFALSE(n_path_offset < ILLEGAL_PATH_ELEMENT_OFFSET, |
427 | "PAP-5090: invalid path offset"); | |
1da177e4 | 428 | |
bd4c625c LT |
429 | while (n_path_offset > ILLEGAL_PATH_ELEMENT_OFFSET) |
430 | brelse(PATH_OFFSET_PBUFFER(p_s_search_path, n_path_offset--)); | |
1da177e4 | 431 | |
bd4c625c LT |
432 | p_s_search_path->path_length = ILLEGAL_PATH_ELEMENT_OFFSET; |
433 | } | |
1da177e4 | 434 | |
bd4c625c LT |
435 | static int is_leaf(char *buf, int blocksize, struct buffer_head *bh) |
436 | { | |
437 | struct block_head *blkh; | |
438 | struct item_head *ih; | |
439 | int used_space; | |
440 | int prev_location; | |
441 | int i; | |
442 | int nr; | |
443 | ||
444 | blkh = (struct block_head *)buf; | |
445 | if (blkh_level(blkh) != DISK_LEAF_NODE_LEVEL) { | |
45b03d5e JM |
446 | reiserfs_warning(NULL, "reiserfs-5080", |
447 | "this should be caught earlier"); | |
bd4c625c | 448 | return 0; |
1da177e4 | 449 | } |
bd4c625c LT |
450 | |
451 | nr = blkh_nr_item(blkh); | |
452 | if (nr < 1 || nr > ((blocksize - BLKH_SIZE) / (IH_SIZE + MIN_ITEM_LEN))) { | |
453 | /* item number is too big or too small */ | |
45b03d5e JM |
454 | reiserfs_warning(NULL, "reiserfs-5081", |
455 | "nr_item seems wrong: %z", bh); | |
bd4c625c | 456 | return 0; |
1da177e4 | 457 | } |
bd4c625c LT |
458 | ih = (struct item_head *)(buf + BLKH_SIZE) + nr - 1; |
459 | used_space = BLKH_SIZE + IH_SIZE * nr + (blocksize - ih_location(ih)); | |
460 | if (used_space != blocksize - blkh_free_space(blkh)) { | |
461 | /* free space does not match to calculated amount of use space */ | |
45b03d5e JM |
462 | reiserfs_warning(NULL, "reiserfs-5082", |
463 | "free space seems wrong: %z", bh); | |
bd4c625c | 464 | return 0; |
1da177e4 | 465 | } |
bd4c625c LT |
466 | // FIXME: it is_leaf will hit performance too much - we may have |
467 | // return 1 here | |
468 | ||
469 | /* check tables of item heads */ | |
470 | ih = (struct item_head *)(buf + BLKH_SIZE); | |
471 | prev_location = blocksize; | |
472 | for (i = 0; i < nr; i++, ih++) { | |
473 | if (le_ih_k_type(ih) == TYPE_ANY) { | |
45b03d5e JM |
474 | reiserfs_warning(NULL, "reiserfs-5083", |
475 | "wrong item type for item %h", | |
bd4c625c LT |
476 | ih); |
477 | return 0; | |
478 | } | |
479 | if (ih_location(ih) >= blocksize | |
480 | || ih_location(ih) < IH_SIZE * nr) { | |
45b03d5e JM |
481 | reiserfs_warning(NULL, "reiserfs-5084", |
482 | "item location seems wrong: %h", | |
bd4c625c LT |
483 | ih); |
484 | return 0; | |
485 | } | |
486 | if (ih_item_len(ih) < 1 | |
487 | || ih_item_len(ih) > MAX_ITEM_LEN(blocksize)) { | |
45b03d5e JM |
488 | reiserfs_warning(NULL, "reiserfs-5085", |
489 | "item length seems wrong: %h", | |
bd4c625c LT |
490 | ih); |
491 | return 0; | |
492 | } | |
493 | if (prev_location - ih_location(ih) != ih_item_len(ih)) { | |
45b03d5e JM |
494 | reiserfs_warning(NULL, "reiserfs-5086", |
495 | "item location seems wrong " | |
496 | "(second one): %h", ih); | |
bd4c625c LT |
497 | return 0; |
498 | } | |
499 | prev_location = ih_location(ih); | |
1da177e4 | 500 | } |
1da177e4 | 501 | |
bd4c625c LT |
502 | // one may imagine much more checks |
503 | return 1; | |
1da177e4 LT |
504 | } |
505 | ||
1da177e4 | 506 | /* returns 1 if buf looks like an internal node, 0 otherwise */ |
bd4c625c | 507 | static int is_internal(char *buf, int blocksize, struct buffer_head *bh) |
1da177e4 | 508 | { |
bd4c625c LT |
509 | struct block_head *blkh; |
510 | int nr; | |
511 | int used_space; | |
512 | ||
513 | blkh = (struct block_head *)buf; | |
514 | nr = blkh_level(blkh); | |
515 | if (nr <= DISK_LEAF_NODE_LEVEL || nr > MAX_HEIGHT) { | |
516 | /* this level is not possible for internal nodes */ | |
45b03d5e JM |
517 | reiserfs_warning(NULL, "reiserfs-5087", |
518 | "this should be caught earlier"); | |
bd4c625c LT |
519 | return 0; |
520 | } | |
1da177e4 | 521 | |
bd4c625c LT |
522 | nr = blkh_nr_item(blkh); |
523 | if (nr > (blocksize - BLKH_SIZE - DC_SIZE) / (KEY_SIZE + DC_SIZE)) { | |
524 | /* for internal which is not root we might check min number of keys */ | |
45b03d5e JM |
525 | reiserfs_warning(NULL, "reiserfs-5088", |
526 | "number of key seems wrong: %z", bh); | |
bd4c625c LT |
527 | return 0; |
528 | } | |
1da177e4 | 529 | |
bd4c625c LT |
530 | used_space = BLKH_SIZE + KEY_SIZE * nr + DC_SIZE * (nr + 1); |
531 | if (used_space != blocksize - blkh_free_space(blkh)) { | |
45b03d5e JM |
532 | reiserfs_warning(NULL, "reiserfs-5089", |
533 | "free space seems wrong: %z", bh); | |
bd4c625c LT |
534 | return 0; |
535 | } | |
536 | // one may imagine much more checks | |
537 | return 1; | |
1da177e4 LT |
538 | } |
539 | ||
1da177e4 LT |
540 | // make sure that bh contains formatted node of reiserfs tree of |
541 | // 'level'-th level | |
bd4c625c | 542 | static int is_tree_node(struct buffer_head *bh, int level) |
1da177e4 | 543 | { |
bd4c625c | 544 | if (B_LEVEL(bh) != level) { |
45b03d5e JM |
545 | reiserfs_warning(NULL, "reiserfs-5090", "node level %d does " |
546 | "not match to the expected one %d", | |
bd4c625c LT |
547 | B_LEVEL(bh), level); |
548 | return 0; | |
549 | } | |
550 | if (level == DISK_LEAF_NODE_LEVEL) | |
551 | return is_leaf(bh->b_data, bh->b_size, bh); | |
1da177e4 | 552 | |
bd4c625c | 553 | return is_internal(bh->b_data, bh->b_size, bh); |
1da177e4 LT |
554 | } |
555 | ||
1da177e4 LT |
556 | #define SEARCH_BY_KEY_READA 16 |
557 | ||
558 | /* The function is NOT SCHEDULE-SAFE! */ | |
bd4c625c LT |
559 | static void search_by_key_reada(struct super_block *s, |
560 | struct buffer_head **bh, | |
3ee16670 | 561 | b_blocknr_t *b, int num) |
1da177e4 | 562 | { |
bd4c625c LT |
563 | int i, j; |
564 | ||
565 | for (i = 0; i < num; i++) { | |
566 | bh[i] = sb_getblk(s, b[i]); | |
567 | } | |
568 | for (j = 0; j < i; j++) { | |
569 | /* | |
570 | * note, this needs attention if we are getting rid of the BKL | |
571 | * you have to make sure the prepared bit isn't set on this buffer | |
572 | */ | |
573 | if (!buffer_uptodate(bh[j])) | |
574 | ll_rw_block(READA, 1, bh + j); | |
575 | brelse(bh[j]); | |
576 | } | |
1da177e4 LT |
577 | } |
578 | ||
579 | /************************************************************************** | |
580 | * Algorithm SearchByKey * | |
581 | * look for item in the Disk S+Tree by its key * | |
582 | * Input: p_s_sb - super block * | |
583 | * p_s_key - pointer to the key to search * | |
584 | * Output: ITEM_FOUND, ITEM_NOT_FOUND or IO_ERROR * | |
585 | * p_s_search_path - path from the root to the needed leaf * | |
586 | **************************************************************************/ | |
587 | ||
588 | /* This function fills up the path from the root to the leaf as it | |
589 | descends the tree looking for the key. It uses reiserfs_bread to | |
590 | try to find buffers in the cache given their block number. If it | |
591 | does not find them in the cache it reads them from disk. For each | |
592 | node search_by_key finds using reiserfs_bread it then uses | |
593 | bin_search to look through that node. bin_search will find the | |
594 | position of the block_number of the next node if it is looking | |
595 | through an internal node. If it is looking through a leaf node | |
596 | bin_search will find the position of the item which has key either | |
597 | equal to given key, or which is the maximal key less than the given | |
598 | key. search_by_key returns a path that must be checked for the | |
599 | correctness of the top of the path but need not be checked for the | |
600 | correctness of the bottom of the path */ | |
601 | /* The function is NOT SCHEDULE-SAFE! */ | |
bd4c625c | 602 | int search_by_key(struct super_block *p_s_sb, const struct cpu_key *p_s_key, /* Key to search. */ |
fec6d055 | 603 | struct treepath *p_s_search_path,/* This structure was |
bd4c625c LT |
604 | allocated and initialized |
605 | by the calling | |
606 | function. It is filled up | |
607 | by this function. */ | |
608 | int n_stop_level /* How far down the tree to search. To | |
609 | stop at leaf level - set to | |
610 | DISK_LEAF_NODE_LEVEL */ | |
611 | ) | |
612 | { | |
3ee16670 | 613 | b_blocknr_t n_block_number; |
bd4c625c LT |
614 | int expected_level; |
615 | struct buffer_head *p_s_bh; | |
616 | struct path_element *p_s_last_element; | |
617 | int n_node_level, n_retval; | |
618 | int right_neighbor_of_leaf_node; | |
619 | int fs_gen; | |
620 | struct buffer_head *reada_bh[SEARCH_BY_KEY_READA]; | |
3ee16670 | 621 | b_blocknr_t reada_blocks[SEARCH_BY_KEY_READA]; |
bd4c625c | 622 | int reada_count = 0; |
1da177e4 LT |
623 | |
624 | #ifdef CONFIG_REISERFS_CHECK | |
bd4c625c | 625 | int n_repeat_counter = 0; |
1da177e4 | 626 | #endif |
1da177e4 | 627 | |
bd4c625c LT |
628 | PROC_INFO_INC(p_s_sb, search_by_key); |
629 | ||
630 | /* As we add each node to a path we increase its count. This means that | |
631 | we must be careful to release all nodes in a path before we either | |
632 | discard the path struct or re-use the path struct, as we do here. */ | |
1da177e4 | 633 | |
bd4c625c | 634 | decrement_counters_in_path(p_s_search_path); |
1da177e4 | 635 | |
bd4c625c LT |
636 | right_neighbor_of_leaf_node = 0; |
637 | ||
638 | /* With each iteration of this loop we search through the items in the | |
639 | current node, and calculate the next current node(next path element) | |
640 | for the next iteration of this loop.. */ | |
641 | n_block_number = SB_ROOT_BLOCK(p_s_sb); | |
642 | expected_level = -1; | |
643 | while (1) { | |
1da177e4 LT |
644 | |
645 | #ifdef CONFIG_REISERFS_CHECK | |
bd4c625c | 646 | if (!(++n_repeat_counter % 50000)) |
45b03d5e JM |
647 | reiserfs_warning(p_s_sb, "PAP-5100", |
648 | "%s: there were %d iterations of " | |
649 | "while loop looking for key %K", | |
bd4c625c LT |
650 | current->comm, n_repeat_counter, |
651 | p_s_key); | |
1da177e4 LT |
652 | #endif |
653 | ||
bd4c625c LT |
654 | /* prep path to have another element added to it. */ |
655 | p_s_last_element = | |
656 | PATH_OFFSET_PELEMENT(p_s_search_path, | |
657 | ++p_s_search_path->path_length); | |
658 | fs_gen = get_generation(p_s_sb); | |
659 | ||
660 | /* Read the next tree node, and set the last element in the path to | |
661 | have a pointer to it. */ | |
662 | if ((p_s_bh = p_s_last_element->pe_buffer = | |
663 | sb_getblk(p_s_sb, n_block_number))) { | |
664 | if (!buffer_uptodate(p_s_bh) && reada_count > 1) { | |
665 | search_by_key_reada(p_s_sb, reada_bh, | |
666 | reada_blocks, reada_count); | |
667 | } | |
668 | ll_rw_block(READ, 1, &p_s_bh); | |
669 | wait_on_buffer(p_s_bh); | |
670 | if (!buffer_uptodate(p_s_bh)) | |
671 | goto io_error; | |
672 | } else { | |
673 | io_error: | |
674 | p_s_search_path->path_length--; | |
675 | pathrelse(p_s_search_path); | |
676 | return IO_ERROR; | |
677 | } | |
678 | reada_count = 0; | |
679 | if (expected_level == -1) | |
680 | expected_level = SB_TREE_HEIGHT(p_s_sb); | |
681 | expected_level--; | |
682 | ||
683 | /* It is possible that schedule occurred. We must check whether the key | |
684 | to search is still in the tree rooted from the current buffer. If | |
685 | not then repeat search from the root. */ | |
686 | if (fs_changed(fs_gen, p_s_sb) && | |
687 | (!B_IS_IN_TREE(p_s_bh) || | |
688 | B_LEVEL(p_s_bh) != expected_level || | |
689 | !key_in_buffer(p_s_search_path, p_s_key, p_s_sb))) { | |
690 | PROC_INFO_INC(p_s_sb, search_by_key_fs_changed); | |
691 | PROC_INFO_INC(p_s_sb, search_by_key_restarted); | |
692 | PROC_INFO_INC(p_s_sb, | |
693 | sbk_restarted[expected_level - 1]); | |
694 | decrement_counters_in_path(p_s_search_path); | |
695 | ||
696 | /* Get the root block number so that we can repeat the search | |
697 | starting from the root. */ | |
698 | n_block_number = SB_ROOT_BLOCK(p_s_sb); | |
699 | expected_level = -1; | |
700 | right_neighbor_of_leaf_node = 0; | |
701 | ||
702 | /* repeat search from the root */ | |
703 | continue; | |
704 | } | |
1da177e4 | 705 | |
bd4c625c LT |
706 | /* only check that the key is in the buffer if p_s_key is not |
707 | equal to the MAX_KEY. Latter case is only possible in | |
708 | "finish_unfinished()" processing during mount. */ | |
709 | RFALSE(comp_keys(&MAX_KEY, p_s_key) && | |
710 | !key_in_buffer(p_s_search_path, p_s_key, p_s_sb), | |
711 | "PAP-5130: key is not in the buffer"); | |
1da177e4 | 712 | #ifdef CONFIG_REISERFS_CHECK |
bd4c625c LT |
713 | if (cur_tb) { |
714 | print_cur_tb("5140"); | |
c3a9c210 JM |
715 | reiserfs_panic(p_s_sb, "PAP-5140", |
716 | "schedule occurred in do_balance!"); | |
bd4c625c | 717 | } |
1da177e4 LT |
718 | #endif |
719 | ||
bd4c625c LT |
720 | // make sure, that the node contents look like a node of |
721 | // certain level | |
722 | if (!is_tree_node(p_s_bh, expected_level)) { | |
0030b645 JM |
723 | reiserfs_error(p_s_sb, "vs-5150", |
724 | "invalid format found in block %ld. " | |
725 | "Fsck?", p_s_bh->b_blocknr); | |
bd4c625c LT |
726 | pathrelse(p_s_search_path); |
727 | return IO_ERROR; | |
728 | } | |
1da177e4 | 729 | |
bd4c625c LT |
730 | /* ok, we have acquired next formatted node in the tree */ |
731 | n_node_level = B_LEVEL(p_s_bh); | |
1da177e4 | 732 | |
bd4c625c | 733 | PROC_INFO_BH_STAT(p_s_sb, p_s_bh, n_node_level - 1); |
1da177e4 | 734 | |
bd4c625c LT |
735 | RFALSE(n_node_level < n_stop_level, |
736 | "vs-5152: tree level (%d) is less than stop level (%d)", | |
737 | n_node_level, n_stop_level); | |
1da177e4 | 738 | |
bd4c625c LT |
739 | n_retval = bin_search(p_s_key, B_N_PITEM_HEAD(p_s_bh, 0), |
740 | B_NR_ITEMS(p_s_bh), | |
741 | (n_node_level == | |
742 | DISK_LEAF_NODE_LEVEL) ? IH_SIZE : | |
743 | KEY_SIZE, | |
744 | &(p_s_last_element->pe_position)); | |
745 | if (n_node_level == n_stop_level) { | |
746 | return n_retval; | |
747 | } | |
1da177e4 | 748 | |
bd4c625c LT |
749 | /* we are not in the stop level */ |
750 | if (n_retval == ITEM_FOUND) | |
751 | /* item has been found, so we choose the pointer which is to the right of the found one */ | |
752 | p_s_last_element->pe_position++; | |
753 | ||
754 | /* if item was not found we choose the position which is to | |
755 | the left of the found item. This requires no code, | |
756 | bin_search did it already. */ | |
757 | ||
758 | /* So we have chosen a position in the current node which is | |
759 | an internal node. Now we calculate child block number by | |
760 | position in the node. */ | |
761 | n_block_number = | |
762 | B_N_CHILD_NUM(p_s_bh, p_s_last_element->pe_position); | |
763 | ||
764 | /* if we are going to read leaf nodes, try for read ahead as well */ | |
765 | if ((p_s_search_path->reada & PATH_READA) && | |
766 | n_node_level == DISK_LEAF_NODE_LEVEL + 1) { | |
767 | int pos = p_s_last_element->pe_position; | |
768 | int limit = B_NR_ITEMS(p_s_bh); | |
769 | struct reiserfs_key *le_key; | |
770 | ||
771 | if (p_s_search_path->reada & PATH_READA_BACK) | |
772 | limit = 0; | |
773 | while (reada_count < SEARCH_BY_KEY_READA) { | |
774 | if (pos == limit) | |
775 | break; | |
776 | reada_blocks[reada_count++] = | |
777 | B_N_CHILD_NUM(p_s_bh, pos); | |
778 | if (p_s_search_path->reada & PATH_READA_BACK) | |
779 | pos--; | |
780 | else | |
781 | pos++; | |
782 | ||
783 | /* | |
784 | * check to make sure we're in the same object | |
785 | */ | |
786 | le_key = B_N_PDELIM_KEY(p_s_bh, pos); | |
787 | if (le32_to_cpu(le_key->k_objectid) != | |
788 | p_s_key->on_disk_key.k_objectid) { | |
789 | break; | |
790 | } | |
791 | } | |
1da177e4 | 792 | } |
bd4c625c | 793 | } |
1da177e4 LT |
794 | } |
795 | ||
1da177e4 LT |
796 | /* Form the path to an item and position in this item which contains |
797 | file byte defined by p_s_key. If there is no such item | |
798 | corresponding to the key, we point the path to the item with | |
799 | maximal key less than p_s_key, and *p_n_pos_in_item is set to one | |
800 | past the last entry/byte in the item. If searching for entry in a | |
801 | directory item, and it is not found, *p_n_pos_in_item is set to one | |
802 | entry more than the entry with maximal key which is less than the | |
803 | sought key. | |
804 | ||
805 | Note that if there is no entry in this same node which is one more, | |
806 | then we point to an imaginary entry. for direct items, the | |
807 | position is in units of bytes, for indirect items the position is | |
808 | in units of blocknr entries, for directory items the position is in | |
809 | units of directory entries. */ | |
810 | ||
811 | /* The function is NOT SCHEDULE-SAFE! */ | |
bd4c625c LT |
812 | int search_for_position_by_key(struct super_block *p_s_sb, /* Pointer to the super block. */ |
813 | const struct cpu_key *p_cpu_key, /* Key to search (cpu variable) */ | |
fec6d055 | 814 | struct treepath *p_s_search_path /* Filled up by this function. */ |
bd4c625c LT |
815 | ) |
816 | { | |
817 | struct item_head *p_le_ih; /* pointer to on-disk structure */ | |
818 | int n_blk_size; | |
819 | loff_t item_offset, offset; | |
820 | struct reiserfs_dir_entry de; | |
821 | int retval; | |
822 | ||
823 | /* If searching for directory entry. */ | |
824 | if (is_direntry_cpu_key(p_cpu_key)) | |
825 | return search_by_entry_key(p_s_sb, p_cpu_key, p_s_search_path, | |
826 | &de); | |
827 | ||
828 | /* If not searching for directory entry. */ | |
829 | ||
830 | /* If item is found. */ | |
831 | retval = search_item(p_s_sb, p_cpu_key, p_s_search_path); | |
832 | if (retval == IO_ERROR) | |
833 | return retval; | |
834 | if (retval == ITEM_FOUND) { | |
1da177e4 | 835 | |
bd4c625c LT |
836 | RFALSE(!ih_item_len |
837 | (B_N_PITEM_HEAD | |
838 | (PATH_PLAST_BUFFER(p_s_search_path), | |
839 | PATH_LAST_POSITION(p_s_search_path))), | |
840 | "PAP-5165: item length equals zero"); | |
1da177e4 | 841 | |
bd4c625c LT |
842 | pos_in_item(p_s_search_path) = 0; |
843 | return POSITION_FOUND; | |
844 | } | |
1da177e4 | 845 | |
bd4c625c LT |
846 | RFALSE(!PATH_LAST_POSITION(p_s_search_path), |
847 | "PAP-5170: position equals zero"); | |
1da177e4 | 848 | |
bd4c625c LT |
849 | /* Item is not found. Set path to the previous item. */ |
850 | p_le_ih = | |
851 | B_N_PITEM_HEAD(PATH_PLAST_BUFFER(p_s_search_path), | |
852 | --PATH_LAST_POSITION(p_s_search_path)); | |
853 | n_blk_size = p_s_sb->s_blocksize; | |
1da177e4 | 854 | |
bd4c625c LT |
855 | if (comp_short_keys(&(p_le_ih->ih_key), p_cpu_key)) { |
856 | return FILE_NOT_FOUND; | |
857 | } | |
858 | // FIXME: quite ugly this far | |
1da177e4 | 859 | |
bd4c625c LT |
860 | item_offset = le_ih_k_offset(p_le_ih); |
861 | offset = cpu_key_k_offset(p_cpu_key); | |
1da177e4 | 862 | |
bd4c625c LT |
863 | /* Needed byte is contained in the item pointed to by the path. */ |
864 | if (item_offset <= offset && | |
865 | item_offset + op_bytes_number(p_le_ih, n_blk_size) > offset) { | |
866 | pos_in_item(p_s_search_path) = offset - item_offset; | |
867 | if (is_indirect_le_ih(p_le_ih)) { | |
868 | pos_in_item(p_s_search_path) /= n_blk_size; | |
869 | } | |
870 | return POSITION_FOUND; | |
1da177e4 | 871 | } |
1da177e4 | 872 | |
bd4c625c LT |
873 | /* Needed byte is not contained in the item pointed to by the |
874 | path. Set pos_in_item out of the item. */ | |
875 | if (is_indirect_le_ih(p_le_ih)) | |
876 | pos_in_item(p_s_search_path) = | |
877 | ih_item_len(p_le_ih) / UNFM_P_SIZE; | |
878 | else | |
879 | pos_in_item(p_s_search_path) = ih_item_len(p_le_ih); | |
880 | ||
881 | return POSITION_NOT_FOUND; | |
882 | } | |
1da177e4 LT |
883 | |
884 | /* Compare given item and item pointed to by the path. */ | |
fec6d055 | 885 | int comp_items(const struct item_head *stored_ih, const struct treepath *p_s_path) |
1da177e4 | 886 | { |
bd4c625c LT |
887 | struct buffer_head *p_s_bh; |
888 | struct item_head *ih; | |
1da177e4 | 889 | |
bd4c625c LT |
890 | /* Last buffer at the path is not in the tree. */ |
891 | if (!B_IS_IN_TREE(p_s_bh = PATH_PLAST_BUFFER(p_s_path))) | |
892 | return 1; | |
1da177e4 | 893 | |
bd4c625c LT |
894 | /* Last path position is invalid. */ |
895 | if (PATH_LAST_POSITION(p_s_path) >= B_NR_ITEMS(p_s_bh)) | |
896 | return 1; | |
1da177e4 | 897 | |
bd4c625c LT |
898 | /* we need only to know, whether it is the same item */ |
899 | ih = get_ih(p_s_path); | |
900 | return memcmp(stored_ih, ih, IH_SIZE); | |
1da177e4 LT |
901 | } |
902 | ||
1da177e4 LT |
903 | /* unformatted nodes are not logged anymore, ever. This is safe |
904 | ** now | |
905 | */ | |
906 | #define held_by_others(bh) (atomic_read(&(bh)->b_count) > 1) | |
907 | ||
908 | // block can not be forgotten as it is in I/O or held by someone | |
909 | #define block_in_use(bh) (buffer_locked(bh) || (held_by_others(bh))) | |
910 | ||
1da177e4 | 911 | // prepare for delete or cut of direct item |
fec6d055 | 912 | static inline int prepare_for_direct_item(struct treepath *path, |
bd4c625c LT |
913 | struct item_head *le_ih, |
914 | struct inode *inode, | |
915 | loff_t new_file_length, int *cut_size) | |
1da177e4 | 916 | { |
bd4c625c LT |
917 | loff_t round_len; |
918 | ||
919 | if (new_file_length == max_reiserfs_offset(inode)) { | |
920 | /* item has to be deleted */ | |
921 | *cut_size = -(IH_SIZE + ih_item_len(le_ih)); | |
922 | return M_DELETE; | |
923 | } | |
924 | // new file gets truncated | |
925 | if (get_inode_item_key_version(inode) == KEY_FORMAT_3_6) { | |
926 | // | |
927 | round_len = ROUND_UP(new_file_length); | |
928 | /* this was n_new_file_length < le_ih ... */ | |
929 | if (round_len < le_ih_k_offset(le_ih)) { | |
930 | *cut_size = -(IH_SIZE + ih_item_len(le_ih)); | |
931 | return M_DELETE; /* Delete this item. */ | |
932 | } | |
933 | /* Calculate first position and size for cutting from item. */ | |
934 | pos_in_item(path) = round_len - (le_ih_k_offset(le_ih) - 1); | |
935 | *cut_size = -(ih_item_len(le_ih) - pos_in_item(path)); | |
936 | ||
937 | return M_CUT; /* Cut from this item. */ | |
938 | } | |
939 | ||
940 | // old file: items may have any length | |
941 | ||
942 | if (new_file_length < le_ih_k_offset(le_ih)) { | |
943 | *cut_size = -(IH_SIZE + ih_item_len(le_ih)); | |
944 | return M_DELETE; /* Delete this item. */ | |
1da177e4 LT |
945 | } |
946 | /* Calculate first position and size for cutting from item. */ | |
bd4c625c LT |
947 | *cut_size = -(ih_item_len(le_ih) - |
948 | (pos_in_item(path) = | |
949 | new_file_length + 1 - le_ih_k_offset(le_ih))); | |
950 | return M_CUT; /* Cut from this item. */ | |
1da177e4 LT |
951 | } |
952 | ||
fec6d055 | 953 | static inline int prepare_for_direntry_item(struct treepath *path, |
bd4c625c LT |
954 | struct item_head *le_ih, |
955 | struct inode *inode, | |
956 | loff_t new_file_length, | |
957 | int *cut_size) | |
1da177e4 | 958 | { |
bd4c625c LT |
959 | if (le_ih_k_offset(le_ih) == DOT_OFFSET && |
960 | new_file_length == max_reiserfs_offset(inode)) { | |
961 | RFALSE(ih_entry_count(le_ih) != 2, | |
962 | "PAP-5220: incorrect empty directory item (%h)", le_ih); | |
963 | *cut_size = -(IH_SIZE + ih_item_len(le_ih)); | |
964 | return M_DELETE; /* Delete the directory item containing "." and ".." entry. */ | |
965 | } | |
1da177e4 | 966 | |
bd4c625c LT |
967 | if (ih_entry_count(le_ih) == 1) { |
968 | /* Delete the directory item such as there is one record only | |
969 | in this item */ | |
970 | *cut_size = -(IH_SIZE + ih_item_len(le_ih)); | |
971 | return M_DELETE; | |
972 | } | |
973 | ||
974 | /* Cut one record from the directory item. */ | |
975 | *cut_size = | |
976 | -(DEH_SIZE + | |
977 | entry_length(get_last_bh(path), le_ih, pos_in_item(path))); | |
978 | return M_CUT; | |
979 | } | |
1da177e4 | 980 | |
23f9e0f8 AZ |
981 | #define JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD (2 * JOURNAL_PER_BALANCE_CNT + 1) |
982 | ||
1da177e4 LT |
983 | /* If the path points to a directory or direct item, calculate mode and the size cut, for balance. |
984 | If the path points to an indirect item, remove some number of its unformatted nodes. | |
985 | In case of file truncate calculate whether this item must be deleted/truncated or last | |
986 | unformatted node of this item will be converted to a direct item. | |
987 | This function returns a determination of what balance mode the calling function should employ. */ | |
fec6d055 | 988 | static char prepare_for_delete_or_cut(struct reiserfs_transaction_handle *th, struct inode *inode, struct treepath *p_s_path, const struct cpu_key *p_s_item_key, int *p_n_removed, /* Number of unformatted nodes which were removed |
bd4c625c LT |
989 | from end of the file. */ |
990 | int *p_n_cut_size, unsigned long long n_new_file_length /* MAX_KEY_OFFSET in case of delete. */ | |
991 | ) | |
992 | { | |
993 | struct super_block *p_s_sb = inode->i_sb; | |
994 | struct item_head *p_le_ih = PATH_PITEM_HEAD(p_s_path); | |
995 | struct buffer_head *p_s_bh = PATH_PLAST_BUFFER(p_s_path); | |
1da177e4 | 996 | |
bd4c625c | 997 | BUG_ON(!th->t_trans_id); |
1da177e4 | 998 | |
bd4c625c LT |
999 | /* Stat_data item. */ |
1000 | if (is_statdata_le_ih(p_le_ih)) { | |
1da177e4 | 1001 | |
bd4c625c LT |
1002 | RFALSE(n_new_file_length != max_reiserfs_offset(inode), |
1003 | "PAP-5210: mode must be M_DELETE"); | |
1da177e4 | 1004 | |
bd4c625c LT |
1005 | *p_n_cut_size = -(IH_SIZE + ih_item_len(p_le_ih)); |
1006 | return M_DELETE; | |
1007 | } | |
1da177e4 | 1008 | |
bd4c625c LT |
1009 | /* Directory item. */ |
1010 | if (is_direntry_le_ih(p_le_ih)) | |
1011 | return prepare_for_direntry_item(p_s_path, p_le_ih, inode, | |
1012 | n_new_file_length, | |
1013 | p_n_cut_size); | |
1da177e4 | 1014 | |
bd4c625c LT |
1015 | /* Direct item. */ |
1016 | if (is_direct_le_ih(p_le_ih)) | |
1017 | return prepare_for_direct_item(p_s_path, p_le_ih, inode, | |
1018 | n_new_file_length, p_n_cut_size); | |
1019 | ||
1020 | /* Case of an indirect item. */ | |
1021 | { | |
23f9e0f8 AZ |
1022 | int blk_size = p_s_sb->s_blocksize; |
1023 | struct item_head s_ih; | |
1024 | int need_re_search; | |
1025 | int delete = 0; | |
1026 | int result = M_CUT; | |
1027 | int pos = 0; | |
1028 | ||
1029 | if ( n_new_file_length == max_reiserfs_offset (inode) ) { | |
1030 | /* prepare_for_delete_or_cut() is called by | |
1031 | * reiserfs_delete_item() */ | |
1032 | n_new_file_length = 0; | |
1033 | delete = 1; | |
1034 | } | |
1035 | ||
1036 | do { | |
1037 | need_re_search = 0; | |
1038 | *p_n_cut_size = 0; | |
1039 | p_s_bh = PATH_PLAST_BUFFER(p_s_path); | |
1040 | copy_item_head(&s_ih, PATH_PITEM_HEAD(p_s_path)); | |
1041 | pos = I_UNFM_NUM(&s_ih); | |
bd4c625c | 1042 | |
23f9e0f8 | 1043 | while (le_ih_k_offset (&s_ih) + (pos - 1) * blk_size > n_new_file_length) { |
87588dd6 AV |
1044 | __le32 *unfm; |
1045 | __u32 block; | |
bd4c625c | 1046 | |
23f9e0f8 AZ |
1047 | /* Each unformatted block deletion may involve one additional |
1048 | * bitmap block into the transaction, thereby the initial | |
1049 | * journal space reservation might not be enough. */ | |
1050 | if (!delete && (*p_n_cut_size) != 0 && | |
1051 | reiserfs_transaction_free_space(th) < JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD) { | |
1052 | break; | |
1053 | } | |
bd4c625c | 1054 | |
87588dd6 | 1055 | unfm = (__le32 *)B_I_PITEM(p_s_bh, &s_ih) + pos - 1; |
23f9e0f8 | 1056 | block = get_block_num(unfm, 0); |
bd4c625c | 1057 | |
23f9e0f8 AZ |
1058 | if (block != 0) { |
1059 | reiserfs_prepare_for_journal(p_s_sb, p_s_bh, 1); | |
1060 | put_block_num(unfm, 0, 0); | |
1061 | journal_mark_dirty (th, p_s_sb, p_s_bh); | |
1062 | reiserfs_free_block(th, inode, block, 1); | |
1063 | } | |
bd4c625c | 1064 | |
23f9e0f8 | 1065 | cond_resched(); |
bd4c625c | 1066 | |
23f9e0f8 AZ |
1067 | if (item_moved (&s_ih, p_s_path)) { |
1068 | need_re_search = 1; | |
1069 | break; | |
1070 | } | |
1071 | ||
1072 | pos --; | |
1073 | (*p_n_removed) ++; | |
1074 | (*p_n_cut_size) -= UNFM_P_SIZE; | |
1075 | ||
1076 | if (pos == 0) { | |
1077 | (*p_n_cut_size) -= IH_SIZE; | |
1078 | result = M_DELETE; | |
1079 | break; | |
1080 | } | |
1081 | } | |
1082 | /* a trick. If the buffer has been logged, this will do nothing. If | |
1083 | ** we've broken the loop without logging it, it will restore the | |
1084 | ** buffer */ | |
1085 | reiserfs_restore_prepared_buffer(p_s_sb, p_s_bh); | |
1086 | } while (need_re_search && | |
1087 | search_for_position_by_key(p_s_sb, p_s_item_key, p_s_path) == POSITION_FOUND); | |
1088 | pos_in_item(p_s_path) = pos * UNFM_P_SIZE; | |
1089 | ||
1090 | if (*p_n_cut_size == 0) { | |
1091 | /* Nothing were cut. maybe convert last unformatted node to the | |
1092 | * direct item? */ | |
1093 | result = M_CONVERT; | |
1094 | } | |
1095 | return result; | |
bd4c625c | 1096 | } |
1da177e4 LT |
1097 | } |
1098 | ||
1099 | /* Calculate number of bytes which will be deleted or cut during balance */ | |
bd4c625c LT |
1100 | static int calc_deleted_bytes_number(struct tree_balance *p_s_tb, char c_mode) |
1101 | { | |
1102 | int n_del_size; | |
1103 | struct item_head *p_le_ih = PATH_PITEM_HEAD(p_s_tb->tb_path); | |
1104 | ||
1105 | if (is_statdata_le_ih(p_le_ih)) | |
1106 | return 0; | |
1107 | ||
1108 | n_del_size = | |
1109 | (c_mode == | |
1110 | M_DELETE) ? ih_item_len(p_le_ih) : -p_s_tb->insert_size[0]; | |
1111 | if (is_direntry_le_ih(p_le_ih)) { | |
1112 | // return EMPTY_DIR_SIZE; /* We delete emty directoris only. */ | |
1113 | // we can't use EMPTY_DIR_SIZE, as old format dirs have a different | |
1114 | // empty size. ick. FIXME, is this right? | |
1115 | // | |
1116 | return n_del_size; | |
1117 | } | |
1da177e4 | 1118 | |
bd4c625c LT |
1119 | if (is_indirect_le_ih(p_le_ih)) |
1120 | n_del_size = (n_del_size / UNFM_P_SIZE) * (PATH_PLAST_BUFFER(p_s_tb->tb_path)->b_size); // - get_ih_free_space (p_le_ih); | |
1121 | return n_del_size; | |
1da177e4 LT |
1122 | } |
1123 | ||
bd4c625c LT |
1124 | static void init_tb_struct(struct reiserfs_transaction_handle *th, |
1125 | struct tree_balance *p_s_tb, | |
1126 | struct super_block *p_s_sb, | |
fec6d055 | 1127 | struct treepath *p_s_path, int n_size) |
bd4c625c | 1128 | { |
1da177e4 | 1129 | |
bd4c625c | 1130 | BUG_ON(!th->t_trans_id); |
1da177e4 | 1131 | |
bd4c625c LT |
1132 | memset(p_s_tb, '\0', sizeof(struct tree_balance)); |
1133 | p_s_tb->transaction_handle = th; | |
1134 | p_s_tb->tb_sb = p_s_sb; | |
1135 | p_s_tb->tb_path = p_s_path; | |
1136 | PATH_OFFSET_PBUFFER(p_s_path, ILLEGAL_PATH_ELEMENT_OFFSET) = NULL; | |
1137 | PATH_OFFSET_POSITION(p_s_path, ILLEGAL_PATH_ELEMENT_OFFSET) = 0; | |
1138 | p_s_tb->insert_size[0] = n_size; | |
1139 | } | |
1da177e4 | 1140 | |
bd4c625c | 1141 | void padd_item(char *item, int total_length, int length) |
1da177e4 | 1142 | { |
bd4c625c | 1143 | int i; |
1da177e4 | 1144 | |
bd4c625c LT |
1145 | for (i = total_length; i > length;) |
1146 | item[--i] = 0; | |
1da177e4 LT |
1147 | } |
1148 | ||
1149 | #ifdef REISERQUOTA_DEBUG | |
1150 | char key2type(struct reiserfs_key *ih) | |
1151 | { | |
bd4c625c LT |
1152 | if (is_direntry_le_key(2, ih)) |
1153 | return 'd'; | |
1154 | if (is_direct_le_key(2, ih)) | |
1155 | return 'D'; | |
1156 | if (is_indirect_le_key(2, ih)) | |
1157 | return 'i'; | |
1158 | if (is_statdata_le_key(2, ih)) | |
1159 | return 's'; | |
1160 | return 'u'; | |
1da177e4 LT |
1161 | } |
1162 | ||
1163 | char head2type(struct item_head *ih) | |
1164 | { | |
bd4c625c LT |
1165 | if (is_direntry_le_ih(ih)) |
1166 | return 'd'; | |
1167 | if (is_direct_le_ih(ih)) | |
1168 | return 'D'; | |
1169 | if (is_indirect_le_ih(ih)) | |
1170 | return 'i'; | |
1171 | if (is_statdata_le_ih(ih)) | |
1172 | return 's'; | |
1173 | return 'u'; | |
1da177e4 LT |
1174 | } |
1175 | #endif | |
1176 | ||
1177 | /* Delete object item. */ | |
fec6d055 | 1178 | int reiserfs_delete_item(struct reiserfs_transaction_handle *th, struct treepath *p_s_path, /* Path to the deleted item. */ |
bd4c625c LT |
1179 | const struct cpu_key *p_s_item_key, /* Key to search for the deleted item. */ |
1180 | struct inode *p_s_inode, /* inode is here just to update i_blocks and quotas */ | |
1181 | struct buffer_head *p_s_un_bh) | |
1182 | { /* NULL or unformatted node pointer. */ | |
1183 | struct super_block *p_s_sb = p_s_inode->i_sb; | |
1184 | struct tree_balance s_del_balance; | |
1185 | struct item_head s_ih; | |
1186 | struct item_head *q_ih; | |
1187 | int quota_cut_bytes; | |
1188 | int n_ret_value, n_del_size, n_removed; | |
1da177e4 LT |
1189 | |
1190 | #ifdef CONFIG_REISERFS_CHECK | |
bd4c625c LT |
1191 | char c_mode; |
1192 | int n_iter = 0; | |
1da177e4 LT |
1193 | #endif |
1194 | ||
bd4c625c | 1195 | BUG_ON(!th->t_trans_id); |
1da177e4 | 1196 | |
bd4c625c LT |
1197 | init_tb_struct(th, &s_del_balance, p_s_sb, p_s_path, |
1198 | 0 /*size is unknown */ ); | |
1da177e4 | 1199 | |
bd4c625c LT |
1200 | while (1) { |
1201 | n_removed = 0; | |
1da177e4 LT |
1202 | |
1203 | #ifdef CONFIG_REISERFS_CHECK | |
bd4c625c LT |
1204 | n_iter++; |
1205 | c_mode = | |
1da177e4 | 1206 | #endif |
bd4c625c LT |
1207 | prepare_for_delete_or_cut(th, p_s_inode, p_s_path, |
1208 | p_s_item_key, &n_removed, | |
1209 | &n_del_size, | |
1210 | max_reiserfs_offset(p_s_inode)); | |
1211 | ||
1212 | RFALSE(c_mode != M_DELETE, "PAP-5320: mode must be M_DELETE"); | |
1213 | ||
1214 | copy_item_head(&s_ih, PATH_PITEM_HEAD(p_s_path)); | |
1215 | s_del_balance.insert_size[0] = n_del_size; | |
1216 | ||
1217 | n_ret_value = fix_nodes(M_DELETE, &s_del_balance, NULL, NULL); | |
1218 | if (n_ret_value != REPEAT_SEARCH) | |
1219 | break; | |
1220 | ||
1221 | PROC_INFO_INC(p_s_sb, delete_item_restarted); | |
1222 | ||
1223 | // file system changed, repeat search | |
1224 | n_ret_value = | |
1225 | search_for_position_by_key(p_s_sb, p_s_item_key, p_s_path); | |
1226 | if (n_ret_value == IO_ERROR) | |
1227 | break; | |
1228 | if (n_ret_value == FILE_NOT_FOUND) { | |
45b03d5e | 1229 | reiserfs_warning(p_s_sb, "vs-5340", |
bd4c625c LT |
1230 | "no items of the file %K found", |
1231 | p_s_item_key); | |
1232 | break; | |
1233 | } | |
1234 | } /* while (1) */ | |
1da177e4 | 1235 | |
bd4c625c LT |
1236 | if (n_ret_value != CARRY_ON) { |
1237 | unfix_nodes(&s_del_balance); | |
1238 | return 0; | |
1239 | } | |
1240 | // reiserfs_delete_item returns item length when success | |
1241 | n_ret_value = calc_deleted_bytes_number(&s_del_balance, M_DELETE); | |
1242 | q_ih = get_ih(p_s_path); | |
1243 | quota_cut_bytes = ih_item_len(q_ih); | |
1244 | ||
1245 | /* hack so the quota code doesn't have to guess if the file | |
1246 | ** has a tail. On tail insert, we allocate quota for 1 unformatted node. | |
1247 | ** We test the offset because the tail might have been | |
1248 | ** split into multiple items, and we only want to decrement for | |
1249 | ** the unfm node once | |
1250 | */ | |
1251 | if (!S_ISLNK(p_s_inode->i_mode) && is_direct_le_ih(q_ih)) { | |
1252 | if ((le_ih_k_offset(q_ih) & (p_s_sb->s_blocksize - 1)) == 1) { | |
1253 | quota_cut_bytes = p_s_sb->s_blocksize + UNFM_P_SIZE; | |
1254 | } else { | |
1255 | quota_cut_bytes = 0; | |
1256 | } | |
1da177e4 | 1257 | } |
1da177e4 | 1258 | |
bd4c625c LT |
1259 | if (p_s_un_bh) { |
1260 | int off; | |
1261 | char *data; | |
1262 | ||
1263 | /* We are in direct2indirect conversion, so move tail contents | |
1264 | to the unformatted node */ | |
1265 | /* note, we do the copy before preparing the buffer because we | |
1266 | ** don't care about the contents of the unformatted node yet. | |
1267 | ** the only thing we really care about is the direct item's data | |
1268 | ** is in the unformatted node. | |
1269 | ** | |
1270 | ** Otherwise, we would have to call reiserfs_prepare_for_journal on | |
1271 | ** the unformatted node, which might schedule, meaning we'd have to | |
1272 | ** loop all the way back up to the start of the while loop. | |
1273 | ** | |
1274 | ** The unformatted node must be dirtied later on. We can't be | |
1275 | ** sure here if the entire tail has been deleted yet. | |
1276 | ** | |
1277 | ** p_s_un_bh is from the page cache (all unformatted nodes are | |
1278 | ** from the page cache) and might be a highmem page. So, we | |
1279 | ** can't use p_s_un_bh->b_data. | |
1280 | ** -clm | |
1281 | */ | |
1282 | ||
1283 | data = kmap_atomic(p_s_un_bh->b_page, KM_USER0); | |
1284 | off = ((le_ih_k_offset(&s_ih) - 1) & (PAGE_CACHE_SIZE - 1)); | |
1285 | memcpy(data + off, | |
1286 | B_I_PITEM(PATH_PLAST_BUFFER(p_s_path), &s_ih), | |
1287 | n_ret_value); | |
1288 | kunmap_atomic(data, KM_USER0); | |
1da177e4 | 1289 | } |
bd4c625c LT |
1290 | /* Perform balancing after all resources have been collected at once. */ |
1291 | do_balance(&s_del_balance, NULL, NULL, M_DELETE); | |
1da177e4 LT |
1292 | |
1293 | #ifdef REISERQUOTA_DEBUG | |
bd4c625c LT |
1294 | reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, |
1295 | "reiserquota delete_item(): freeing %u, id=%u type=%c", | |
1296 | quota_cut_bytes, p_s_inode->i_uid, head2type(&s_ih)); | |
1da177e4 | 1297 | #endif |
bd4c625c | 1298 | DQUOT_FREE_SPACE_NODIRTY(p_s_inode, quota_cut_bytes); |
1da177e4 | 1299 | |
bd4c625c LT |
1300 | /* Return deleted body length */ |
1301 | return n_ret_value; | |
1da177e4 LT |
1302 | } |
1303 | ||
1da177e4 LT |
1304 | /* Summary Of Mechanisms For Handling Collisions Between Processes: |
1305 | ||
1306 | deletion of the body of the object is performed by iput(), with the | |
1307 | result that if multiple processes are operating on a file, the | |
1308 | deletion of the body of the file is deferred until the last process | |
1309 | that has an open inode performs its iput(). | |
1310 | ||
1311 | writes and truncates are protected from collisions by use of | |
1312 | semaphores. | |
1313 | ||
1314 | creates, linking, and mknod are protected from collisions with other | |
1315 | processes by making the reiserfs_add_entry() the last step in the | |
1316 | creation, and then rolling back all changes if there was a collision. | |
1317 | - Hans | |
1318 | */ | |
1319 | ||
1da177e4 | 1320 | /* this deletes item which never gets split */ |
bd4c625c LT |
1321 | void reiserfs_delete_solid_item(struct reiserfs_transaction_handle *th, |
1322 | struct inode *inode, struct reiserfs_key *key) | |
1da177e4 | 1323 | { |
bd4c625c LT |
1324 | struct tree_balance tb; |
1325 | INITIALIZE_PATH(path); | |
1326 | int item_len = 0; | |
1327 | int tb_init = 0; | |
1328 | struct cpu_key cpu_key; | |
1329 | int retval; | |
1330 | int quota_cut_bytes = 0; | |
1331 | ||
1332 | BUG_ON(!th->t_trans_id); | |
1333 | ||
1334 | le_key2cpu_key(&cpu_key, key); | |
1335 | ||
1336 | while (1) { | |
1337 | retval = search_item(th->t_super, &cpu_key, &path); | |
1338 | if (retval == IO_ERROR) { | |
0030b645 JM |
1339 | reiserfs_error(th->t_super, "vs-5350", |
1340 | "i/o failure occurred trying " | |
1341 | "to delete %K", &cpu_key); | |
bd4c625c LT |
1342 | break; |
1343 | } | |
1344 | if (retval != ITEM_FOUND) { | |
1345 | pathrelse(&path); | |
1346 | // No need for a warning, if there is just no free space to insert '..' item into the newly-created subdir | |
1347 | if (! | |
1348 | ((unsigned long long) | |
1349 | GET_HASH_VALUE(le_key_k_offset | |
1350 | (le_key_version(key), key)) == 0 | |
1351 | && (unsigned long long) | |
1352 | GET_GENERATION_NUMBER(le_key_k_offset | |
1353 | (le_key_version(key), | |
1354 | key)) == 1)) | |
45b03d5e JM |
1355 | reiserfs_warning(th->t_super, "vs-5355", |
1356 | "%k not found", key); | |
bd4c625c LT |
1357 | break; |
1358 | } | |
1359 | if (!tb_init) { | |
1360 | tb_init = 1; | |
1361 | item_len = ih_item_len(PATH_PITEM_HEAD(&path)); | |
1362 | init_tb_struct(th, &tb, th->t_super, &path, | |
1363 | -(IH_SIZE + item_len)); | |
1364 | } | |
1365 | quota_cut_bytes = ih_item_len(PATH_PITEM_HEAD(&path)); | |
1da177e4 | 1366 | |
bd4c625c LT |
1367 | retval = fix_nodes(M_DELETE, &tb, NULL, NULL); |
1368 | if (retval == REPEAT_SEARCH) { | |
1369 | PROC_INFO_INC(th->t_super, delete_solid_item_restarted); | |
1370 | continue; | |
1371 | } | |
1da177e4 | 1372 | |
bd4c625c LT |
1373 | if (retval == CARRY_ON) { |
1374 | do_balance(&tb, NULL, NULL, M_DELETE); | |
1375 | if (inode) { /* Should we count quota for item? (we don't count quotas for save-links) */ | |
1da177e4 | 1376 | #ifdef REISERQUOTA_DEBUG |
bd4c625c LT |
1377 | reiserfs_debug(th->t_super, REISERFS_DEBUG_CODE, |
1378 | "reiserquota delete_solid_item(): freeing %u id=%u type=%c", | |
1379 | quota_cut_bytes, inode->i_uid, | |
1380 | key2type(key)); | |
1da177e4 | 1381 | #endif |
bd4c625c LT |
1382 | DQUOT_FREE_SPACE_NODIRTY(inode, |
1383 | quota_cut_bytes); | |
1384 | } | |
1385 | break; | |
1386 | } | |
1387 | // IO_ERROR, NO_DISK_SPACE, etc | |
45b03d5e | 1388 | reiserfs_warning(th->t_super, "vs-5360", |
bd4c625c LT |
1389 | "could not delete %K due to fix_nodes failure", |
1390 | &cpu_key); | |
1391 | unfix_nodes(&tb); | |
1392 | break; | |
1da177e4 LT |
1393 | } |
1394 | ||
bd4c625c | 1395 | reiserfs_check_path(&path); |
1da177e4 LT |
1396 | } |
1397 | ||
bd4c625c LT |
1398 | int reiserfs_delete_object(struct reiserfs_transaction_handle *th, |
1399 | struct inode *inode) | |
1da177e4 | 1400 | { |
bd4c625c LT |
1401 | int err; |
1402 | inode->i_size = 0; | |
1403 | BUG_ON(!th->t_trans_id); | |
1404 | ||
1405 | /* for directory this deletes item containing "." and ".." */ | |
1406 | err = | |
1407 | reiserfs_do_truncate(th, inode, NULL, 0 /*no timestamp updates */ ); | |
1408 | if (err) | |
1409 | return err; | |
1410 | ||
1da177e4 | 1411 | #if defined( USE_INODE_GENERATION_COUNTER ) |
bd4c625c LT |
1412 | if (!old_format_only(th->t_super)) { |
1413 | __le32 *inode_generation; | |
1414 | ||
1415 | inode_generation = | |
1416 | &REISERFS_SB(th->t_super)->s_rs->s_inode_generation; | |
9e902df6 | 1417 | le32_add_cpu(inode_generation, 1); |
bd4c625c | 1418 | } |
1da177e4 LT |
1419 | /* USE_INODE_GENERATION_COUNTER */ |
1420 | #endif | |
bd4c625c | 1421 | reiserfs_delete_solid_item(th, inode, INODE_PKEY(inode)); |
1da177e4 | 1422 | |
bd4c625c | 1423 | return err; |
1da177e4 LT |
1424 | } |
1425 | ||
bd4c625c LT |
1426 | static void unmap_buffers(struct page *page, loff_t pos) |
1427 | { | |
1428 | struct buffer_head *bh; | |
1429 | struct buffer_head *head; | |
1430 | struct buffer_head *next; | |
1431 | unsigned long tail_index; | |
1432 | unsigned long cur_index; | |
1433 | ||
1434 | if (page) { | |
1435 | if (page_has_buffers(page)) { | |
1436 | tail_index = pos & (PAGE_CACHE_SIZE - 1); | |
1437 | cur_index = 0; | |
1438 | head = page_buffers(page); | |
1439 | bh = head; | |
1440 | do { | |
1441 | next = bh->b_this_page; | |
1442 | ||
1443 | /* we want to unmap the buffers that contain the tail, and | |
1444 | ** all the buffers after it (since the tail must be at the | |
1445 | ** end of the file). We don't want to unmap file data | |
1446 | ** before the tail, since it might be dirty and waiting to | |
1447 | ** reach disk | |
1448 | */ | |
1449 | cur_index += bh->b_size; | |
1450 | if (cur_index > tail_index) { | |
1451 | reiserfs_unmap_buffer(bh); | |
1452 | } | |
1453 | bh = next; | |
1454 | } while (bh != head); | |
1da177e4 | 1455 | } |
1da177e4 | 1456 | } |
1da177e4 LT |
1457 | } |
1458 | ||
bd4c625c LT |
1459 | static int maybe_indirect_to_direct(struct reiserfs_transaction_handle *th, |
1460 | struct inode *p_s_inode, | |
1461 | struct page *page, | |
fec6d055 | 1462 | struct treepath *p_s_path, |
bd4c625c LT |
1463 | const struct cpu_key *p_s_item_key, |
1464 | loff_t n_new_file_size, char *p_c_mode) | |
1465 | { | |
1466 | struct super_block *p_s_sb = p_s_inode->i_sb; | |
1467 | int n_block_size = p_s_sb->s_blocksize; | |
1468 | int cut_bytes; | |
1469 | BUG_ON(!th->t_trans_id); | |
14a61442 | 1470 | BUG_ON(n_new_file_size != p_s_inode->i_size); |
1da177e4 | 1471 | |
bd4c625c LT |
1472 | /* the page being sent in could be NULL if there was an i/o error |
1473 | ** reading in the last block. The user will hit problems trying to | |
1474 | ** read the file, but for now we just skip the indirect2direct | |
1475 | */ | |
1476 | if (atomic_read(&p_s_inode->i_count) > 1 || | |
1477 | !tail_has_to_be_packed(p_s_inode) || | |
1478 | !page || (REISERFS_I(p_s_inode)->i_flags & i_nopack_mask)) { | |
1479 | // leave tail in an unformatted node | |
1480 | *p_c_mode = M_SKIP_BALANCING; | |
1481 | cut_bytes = | |
1482 | n_block_size - (n_new_file_size & (n_block_size - 1)); | |
1483 | pathrelse(p_s_path); | |
1484 | return cut_bytes; | |
1485 | } | |
1486 | /* Permorm the conversion to a direct_item. */ | |
1487 | /*return indirect_to_direct (p_s_inode, p_s_path, p_s_item_key, n_new_file_size, p_c_mode); */ | |
1488 | return indirect2direct(th, p_s_inode, page, p_s_path, p_s_item_key, | |
1489 | n_new_file_size, p_c_mode); | |
1490 | } | |
1da177e4 LT |
1491 | |
1492 | /* we did indirect_to_direct conversion. And we have inserted direct | |
1493 | item successesfully, but there were no disk space to cut unfm | |
1494 | pointer being converted. Therefore we have to delete inserted | |
1495 | direct item(s) */ | |
bd4c625c | 1496 | static void indirect_to_direct_roll_back(struct reiserfs_transaction_handle *th, |
fec6d055 | 1497 | struct inode *inode, struct treepath *path) |
1da177e4 | 1498 | { |
bd4c625c LT |
1499 | struct cpu_key tail_key; |
1500 | int tail_len; | |
1501 | int removed; | |
1502 | BUG_ON(!th->t_trans_id); | |
1503 | ||
1504 | make_cpu_key(&tail_key, inode, inode->i_size + 1, TYPE_DIRECT, 4); // !!!! | |
1505 | tail_key.key_length = 4; | |
1506 | ||
1507 | tail_len = | |
1508 | (cpu_key_k_offset(&tail_key) & (inode->i_sb->s_blocksize - 1)) - 1; | |
1509 | while (tail_len) { | |
1510 | /* look for the last byte of the tail */ | |
1511 | if (search_for_position_by_key(inode->i_sb, &tail_key, path) == | |
1512 | POSITION_NOT_FOUND) | |
c3a9c210 JM |
1513 | reiserfs_panic(inode->i_sb, "vs-5615", |
1514 | "found invalid item"); | |
bd4c625c LT |
1515 | RFALSE(path->pos_in_item != |
1516 | ih_item_len(PATH_PITEM_HEAD(path)) - 1, | |
1517 | "vs-5616: appended bytes found"); | |
1518 | PATH_LAST_POSITION(path)--; | |
1519 | ||
1520 | removed = | |
1521 | reiserfs_delete_item(th, path, &tail_key, inode, | |
1522 | NULL /*unbh not needed */ ); | |
1523 | RFALSE(removed <= 0 | |
1524 | || removed > tail_len, | |
1525 | "vs-5617: there was tail %d bytes, removed item length %d bytes", | |
1526 | tail_len, removed); | |
1527 | tail_len -= removed; | |
1528 | set_cpu_key_k_offset(&tail_key, | |
1529 | cpu_key_k_offset(&tail_key) - removed); | |
1530 | } | |
45b03d5e JM |
1531 | reiserfs_warning(inode->i_sb, "reiserfs-5091", "indirect_to_direct " |
1532 | "conversion has been rolled back due to " | |
1533 | "lack of disk space"); | |
bd4c625c LT |
1534 | //mark_file_without_tail (inode); |
1535 | mark_inode_dirty(inode); | |
1da177e4 LT |
1536 | } |
1537 | ||
1da177e4 | 1538 | /* (Truncate or cut entry) or delete object item. Returns < 0 on failure */ |
bd4c625c | 1539 | int reiserfs_cut_from_item(struct reiserfs_transaction_handle *th, |
fec6d055 | 1540 | struct treepath *p_s_path, |
bd4c625c LT |
1541 | struct cpu_key *p_s_item_key, |
1542 | struct inode *p_s_inode, | |
1543 | struct page *page, loff_t n_new_file_size) | |
1da177e4 | 1544 | { |
bd4c625c LT |
1545 | struct super_block *p_s_sb = p_s_inode->i_sb; |
1546 | /* Every function which is going to call do_balance must first | |
1547 | create a tree_balance structure. Then it must fill up this | |
1548 | structure by using the init_tb_struct and fix_nodes functions. | |
1549 | After that we can make tree balancing. */ | |
1550 | struct tree_balance s_cut_balance; | |
1551 | struct item_head *p_le_ih; | |
1552 | int n_cut_size = 0, /* Amount to be cut. */ | |
1553 | n_ret_value = CARRY_ON, n_removed = 0, /* Number of the removed unformatted nodes. */ | |
1554 | n_is_inode_locked = 0; | |
1555 | char c_mode; /* Mode of the balance. */ | |
1556 | int retval2 = -1; | |
1557 | int quota_cut_bytes; | |
1558 | loff_t tail_pos = 0; | |
1559 | ||
1560 | BUG_ON(!th->t_trans_id); | |
1561 | ||
1562 | init_tb_struct(th, &s_cut_balance, p_s_inode->i_sb, p_s_path, | |
1563 | n_cut_size); | |
1564 | ||
1565 | /* Repeat this loop until we either cut the item without needing | |
1566 | to balance, or we fix_nodes without schedule occurring */ | |
1567 | while (1) { | |
1568 | /* Determine the balance mode, position of the first byte to | |
1569 | be cut, and size to be cut. In case of the indirect item | |
1570 | free unformatted nodes which are pointed to by the cut | |
1571 | pointers. */ | |
1572 | ||
1573 | c_mode = | |
1574 | prepare_for_delete_or_cut(th, p_s_inode, p_s_path, | |
1575 | p_s_item_key, &n_removed, | |
1576 | &n_cut_size, n_new_file_size); | |
1577 | if (c_mode == M_CONVERT) { | |
1578 | /* convert last unformatted node to direct item or leave | |
1579 | tail in the unformatted node */ | |
1580 | RFALSE(n_ret_value != CARRY_ON, | |
1581 | "PAP-5570: can not convert twice"); | |
1582 | ||
1583 | n_ret_value = | |
1584 | maybe_indirect_to_direct(th, p_s_inode, page, | |
1585 | p_s_path, p_s_item_key, | |
1586 | n_new_file_size, &c_mode); | |
1587 | if (c_mode == M_SKIP_BALANCING) | |
1588 | /* tail has been left in the unformatted node */ | |
1589 | return n_ret_value; | |
1590 | ||
1591 | n_is_inode_locked = 1; | |
1592 | ||
1593 | /* removing of last unformatted node will change value we | |
1594 | have to return to truncate. Save it */ | |
1595 | retval2 = n_ret_value; | |
1596 | /*retval2 = p_s_sb->s_blocksize - (n_new_file_size & (p_s_sb->s_blocksize - 1)); */ | |
1597 | ||
1598 | /* So, we have performed the first part of the conversion: | |
1599 | inserting the new direct item. Now we are removing the | |
1600 | last unformatted node pointer. Set key to search for | |
1601 | it. */ | |
1602 | set_cpu_key_k_type(p_s_item_key, TYPE_INDIRECT); | |
1603 | p_s_item_key->key_length = 4; | |
1604 | n_new_file_size -= | |
1605 | (n_new_file_size & (p_s_sb->s_blocksize - 1)); | |
1606 | tail_pos = n_new_file_size; | |
1607 | set_cpu_key_k_offset(p_s_item_key, n_new_file_size + 1); | |
1608 | if (search_for_position_by_key | |
1609 | (p_s_sb, p_s_item_key, | |
1610 | p_s_path) == POSITION_NOT_FOUND) { | |
1611 | print_block(PATH_PLAST_BUFFER(p_s_path), 3, | |
1612 | PATH_LAST_POSITION(p_s_path) - 1, | |
1613 | PATH_LAST_POSITION(p_s_path) + 1); | |
c3a9c210 JM |
1614 | reiserfs_panic(p_s_sb, "PAP-5580", "item to " |
1615 | "convert does not exist (%K)", | |
bd4c625c LT |
1616 | p_s_item_key); |
1617 | } | |
1618 | continue; | |
1619 | } | |
1620 | if (n_cut_size == 0) { | |
1621 | pathrelse(p_s_path); | |
1622 | return 0; | |
1623 | } | |
1624 | ||
1625 | s_cut_balance.insert_size[0] = n_cut_size; | |
1626 | ||
1627 | n_ret_value = fix_nodes(c_mode, &s_cut_balance, NULL, NULL); | |
1628 | if (n_ret_value != REPEAT_SEARCH) | |
1629 | break; | |
1630 | ||
1631 | PROC_INFO_INC(p_s_sb, cut_from_item_restarted); | |
1632 | ||
1633 | n_ret_value = | |
1634 | search_for_position_by_key(p_s_sb, p_s_item_key, p_s_path); | |
1635 | if (n_ret_value == POSITION_FOUND) | |
1636 | continue; | |
1da177e4 | 1637 | |
45b03d5e | 1638 | reiserfs_warning(p_s_sb, "PAP-5610", "item %K not found", |
bd4c625c LT |
1639 | p_s_item_key); |
1640 | unfix_nodes(&s_cut_balance); | |
1641 | return (n_ret_value == IO_ERROR) ? -EIO : -ENOENT; | |
1642 | } /* while */ | |
1643 | ||
1644 | // check fix_nodes results (IO_ERROR or NO_DISK_SPACE) | |
1645 | if (n_ret_value != CARRY_ON) { | |
1646 | if (n_is_inode_locked) { | |
1647 | // FIXME: this seems to be not needed: we are always able | |
1648 | // to cut item | |
1649 | indirect_to_direct_roll_back(th, p_s_inode, p_s_path); | |
1650 | } | |
1651 | if (n_ret_value == NO_DISK_SPACE) | |
45b03d5e JM |
1652 | reiserfs_warning(p_s_sb, "reiserfs-5092", |
1653 | "NO_DISK_SPACE"); | |
bd4c625c LT |
1654 | unfix_nodes(&s_cut_balance); |
1655 | return -EIO; | |
1da177e4 | 1656 | } |
bd4c625c LT |
1657 | |
1658 | /* go ahead and perform balancing */ | |
1659 | ||
1660 | RFALSE(c_mode == M_PASTE || c_mode == M_INSERT, "invalid mode"); | |
1661 | ||
1662 | /* Calculate number of bytes that need to be cut from the item. */ | |
1663 | quota_cut_bytes = | |
1664 | (c_mode == | |
1665 | M_DELETE) ? ih_item_len(get_ih(p_s_path)) : -s_cut_balance. | |
1666 | insert_size[0]; | |
1667 | if (retval2 == -1) | |
1668 | n_ret_value = calc_deleted_bytes_number(&s_cut_balance, c_mode); | |
1669 | else | |
1670 | n_ret_value = retval2; | |
1671 | ||
1672 | /* For direct items, we only change the quota when deleting the last | |
1673 | ** item. | |
1674 | */ | |
1675 | p_le_ih = PATH_PITEM_HEAD(s_cut_balance.tb_path); | |
1676 | if (!S_ISLNK(p_s_inode->i_mode) && is_direct_le_ih(p_le_ih)) { | |
1677 | if (c_mode == M_DELETE && | |
1678 | (le_ih_k_offset(p_le_ih) & (p_s_sb->s_blocksize - 1)) == | |
1679 | 1) { | |
1680 | // FIXME: this is to keep 3.5 happy | |
1681 | REISERFS_I(p_s_inode)->i_first_direct_byte = U32_MAX; | |
1682 | quota_cut_bytes = p_s_sb->s_blocksize + UNFM_P_SIZE; | |
1683 | } else { | |
1684 | quota_cut_bytes = 0; | |
1685 | } | |
1da177e4 | 1686 | } |
1da177e4 | 1687 | #ifdef CONFIG_REISERFS_CHECK |
bd4c625c LT |
1688 | if (n_is_inode_locked) { |
1689 | struct item_head *le_ih = | |
1690 | PATH_PITEM_HEAD(s_cut_balance.tb_path); | |
1691 | /* we are going to complete indirect2direct conversion. Make | |
1692 | sure, that we exactly remove last unformatted node pointer | |
1693 | of the item */ | |
1694 | if (!is_indirect_le_ih(le_ih)) | |
c3a9c210 | 1695 | reiserfs_panic(p_s_sb, "vs-5652", |
bd4c625c LT |
1696 | "item must be indirect %h", le_ih); |
1697 | ||
1698 | if (c_mode == M_DELETE && ih_item_len(le_ih) != UNFM_P_SIZE) | |
c3a9c210 JM |
1699 | reiserfs_panic(p_s_sb, "vs-5653", "completing " |
1700 | "indirect2direct conversion indirect " | |
1701 | "item %h being deleted must be of " | |
1702 | "4 byte long", le_ih); | |
bd4c625c LT |
1703 | |
1704 | if (c_mode == M_CUT | |
1705 | && s_cut_balance.insert_size[0] != -UNFM_P_SIZE) { | |
c3a9c210 JM |
1706 | reiserfs_panic(p_s_sb, "vs-5654", "can not complete " |
1707 | "indirect2direct conversion of %h " | |
1708 | "(CUT, insert_size==%d)", | |
bd4c625c LT |
1709 | le_ih, s_cut_balance.insert_size[0]); |
1710 | } | |
1711 | /* it would be useful to make sure, that right neighboring | |
1712 | item is direct item of this file */ | |
1da177e4 | 1713 | } |
1da177e4 | 1714 | #endif |
bd4c625c LT |
1715 | |
1716 | do_balance(&s_cut_balance, NULL, NULL, c_mode); | |
1717 | if (n_is_inode_locked) { | |
1718 | /* we've done an indirect->direct conversion. when the data block | |
1719 | ** was freed, it was removed from the list of blocks that must | |
1720 | ** be flushed before the transaction commits, make sure to | |
1721 | ** unmap and invalidate it | |
1722 | */ | |
1723 | unmap_buffers(page, tail_pos); | |
1724 | REISERFS_I(p_s_inode)->i_flags &= ~i_pack_on_close_mask; | |
1725 | } | |
1da177e4 | 1726 | #ifdef REISERQUOTA_DEBUG |
bd4c625c LT |
1727 | reiserfs_debug(p_s_inode->i_sb, REISERFS_DEBUG_CODE, |
1728 | "reiserquota cut_from_item(): freeing %u id=%u type=%c", | |
1729 | quota_cut_bytes, p_s_inode->i_uid, '?'); | |
1da177e4 | 1730 | #endif |
bd4c625c LT |
1731 | DQUOT_FREE_SPACE_NODIRTY(p_s_inode, quota_cut_bytes); |
1732 | return n_ret_value; | |
1da177e4 LT |
1733 | } |
1734 | ||
bd4c625c LT |
1735 | static void truncate_directory(struct reiserfs_transaction_handle *th, |
1736 | struct inode *inode) | |
1da177e4 | 1737 | { |
bd4c625c LT |
1738 | BUG_ON(!th->t_trans_id); |
1739 | if (inode->i_nlink) | |
0030b645 | 1740 | reiserfs_error(inode->i_sb, "vs-5655", "link count != 0"); |
bd4c625c LT |
1741 | |
1742 | set_le_key_k_offset(KEY_FORMAT_3_5, INODE_PKEY(inode), DOT_OFFSET); | |
1743 | set_le_key_k_type(KEY_FORMAT_3_5, INODE_PKEY(inode), TYPE_DIRENTRY); | |
1744 | reiserfs_delete_solid_item(th, inode, INODE_PKEY(inode)); | |
1745 | reiserfs_update_sd(th, inode); | |
1746 | set_le_key_k_offset(KEY_FORMAT_3_5, INODE_PKEY(inode), SD_OFFSET); | |
1747 | set_le_key_k_type(KEY_FORMAT_3_5, INODE_PKEY(inode), TYPE_STAT_DATA); | |
1da177e4 LT |
1748 | } |
1749 | ||
bd4c625c LT |
1750 | /* Truncate file to the new size. Note, this must be called with a transaction |
1751 | already started */ | |
1752 | int reiserfs_do_truncate(struct reiserfs_transaction_handle *th, struct inode *p_s_inode, /* ->i_size contains new | |
1753 | size */ | |
1754 | struct page *page, /* up to date for last block */ | |
1755 | int update_timestamps /* when it is called by | |
1756 | file_release to convert | |
1757 | the tail - no timestamps | |
1758 | should be updated */ | |
1759 | ) | |
1760 | { | |
1761 | INITIALIZE_PATH(s_search_path); /* Path to the current object item. */ | |
1762 | struct item_head *p_le_ih; /* Pointer to an item header. */ | |
1763 | struct cpu_key s_item_key; /* Key to search for a previous file item. */ | |
1764 | loff_t n_file_size, /* Old file size. */ | |
1765 | n_new_file_size; /* New file size. */ | |
1766 | int n_deleted; /* Number of deleted or truncated bytes. */ | |
1767 | int retval; | |
1768 | int err = 0; | |
1769 | ||
1770 | BUG_ON(!th->t_trans_id); | |
1771 | if (! | |
1772 | (S_ISREG(p_s_inode->i_mode) || S_ISDIR(p_s_inode->i_mode) | |
1773 | || S_ISLNK(p_s_inode->i_mode))) | |
1774 | return 0; | |
1775 | ||
1776 | if (S_ISDIR(p_s_inode->i_mode)) { | |
1777 | // deletion of directory - no need to update timestamps | |
1778 | truncate_directory(th, p_s_inode); | |
1779 | return 0; | |
1780 | } | |
1da177e4 | 1781 | |
bd4c625c LT |
1782 | /* Get new file size. */ |
1783 | n_new_file_size = p_s_inode->i_size; | |
1da177e4 | 1784 | |
bd4c625c LT |
1785 | // FIXME: note, that key type is unimportant here |
1786 | make_cpu_key(&s_item_key, p_s_inode, max_reiserfs_offset(p_s_inode), | |
1787 | TYPE_DIRECT, 3); | |
1da177e4 | 1788 | |
bd4c625c LT |
1789 | retval = |
1790 | search_for_position_by_key(p_s_inode->i_sb, &s_item_key, | |
1791 | &s_search_path); | |
1792 | if (retval == IO_ERROR) { | |
0030b645 JM |
1793 | reiserfs_error(p_s_inode->i_sb, "vs-5657", |
1794 | "i/o failure occurred trying to truncate %K", | |
1795 | &s_item_key); | |
bd4c625c LT |
1796 | err = -EIO; |
1797 | goto out; | |
1798 | } | |
1799 | if (retval == POSITION_FOUND || retval == FILE_NOT_FOUND) { | |
0030b645 JM |
1800 | reiserfs_error(p_s_inode->i_sb, "PAP-5660", |
1801 | "wrong result %d of search for %K", retval, | |
1802 | &s_item_key); | |
bd4c625c LT |
1803 | |
1804 | err = -EIO; | |
1805 | goto out; | |
1806 | } | |
1da177e4 | 1807 | |
bd4c625c LT |
1808 | s_search_path.pos_in_item--; |
1809 | ||
1810 | /* Get real file size (total length of all file items) */ | |
1811 | p_le_ih = PATH_PITEM_HEAD(&s_search_path); | |
1812 | if (is_statdata_le_ih(p_le_ih)) | |
1813 | n_file_size = 0; | |
1814 | else { | |
1815 | loff_t offset = le_ih_k_offset(p_le_ih); | |
1816 | int bytes = | |
1817 | op_bytes_number(p_le_ih, p_s_inode->i_sb->s_blocksize); | |
1818 | ||
1819 | /* this may mismatch with real file size: if last direct item | |
1820 | had no padding zeros and last unformatted node had no free | |
1821 | space, this file would have this file size */ | |
1822 | n_file_size = offset + bytes - 1; | |
1823 | } | |
1824 | /* | |
1825 | * are we doing a full truncate or delete, if so | |
1826 | * kick in the reada code | |
1827 | */ | |
1828 | if (n_new_file_size == 0) | |
1829 | s_search_path.reada = PATH_READA | PATH_READA_BACK; | |
1830 | ||
1831 | if (n_file_size == 0 || n_file_size < n_new_file_size) { | |
1832 | goto update_and_out; | |
1da177e4 LT |
1833 | } |
1834 | ||
bd4c625c LT |
1835 | /* Update key to search for the last file item. */ |
1836 | set_cpu_key_k_offset(&s_item_key, n_file_size); | |
1837 | ||
1838 | do { | |
1839 | /* Cut or delete file item. */ | |
1840 | n_deleted = | |
1841 | reiserfs_cut_from_item(th, &s_search_path, &s_item_key, | |
1842 | p_s_inode, page, n_new_file_size); | |
1843 | if (n_deleted < 0) { | |
45b03d5e JM |
1844 | reiserfs_warning(p_s_inode->i_sb, "vs-5665", |
1845 | "reiserfs_cut_from_item failed"); | |
bd4c625c LT |
1846 | reiserfs_check_path(&s_search_path); |
1847 | return 0; | |
1848 | } | |
1da177e4 | 1849 | |
bd4c625c LT |
1850 | RFALSE(n_deleted > n_file_size, |
1851 | "PAP-5670: reiserfs_cut_from_item: too many bytes deleted: deleted %d, file_size %lu, item_key %K", | |
1852 | n_deleted, n_file_size, &s_item_key); | |
1da177e4 | 1853 | |
bd4c625c LT |
1854 | /* Change key to search the last file item. */ |
1855 | n_file_size -= n_deleted; | |
1da177e4 | 1856 | |
bd4c625c | 1857 | set_cpu_key_k_offset(&s_item_key, n_file_size); |
1da177e4 | 1858 | |
bd4c625c LT |
1859 | /* While there are bytes to truncate and previous file item is presented in the tree. */ |
1860 | ||
1861 | /* | |
1862 | ** This loop could take a really long time, and could log | |
1863 | ** many more blocks than a transaction can hold. So, we do a polite | |
1864 | ** journal end here, and if the transaction needs ending, we make | |
1865 | ** sure the file is consistent before ending the current trans | |
1866 | ** and starting a new one | |
1867 | */ | |
23f9e0f8 AZ |
1868 | if (journal_transaction_should_end(th, 0) || |
1869 | reiserfs_transaction_free_space(th) <= JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD) { | |
bd4c625c LT |
1870 | int orig_len_alloc = th->t_blocks_allocated; |
1871 | decrement_counters_in_path(&s_search_path); | |
1872 | ||
1873 | if (update_timestamps) { | |
1874 | p_s_inode->i_mtime = p_s_inode->i_ctime = | |
1875 | CURRENT_TIME_SEC; | |
1876 | } | |
1877 | reiserfs_update_sd(th, p_s_inode); | |
1878 | ||
1879 | err = journal_end(th, p_s_inode->i_sb, orig_len_alloc); | |
1880 | if (err) | |
1881 | goto out; | |
1882 | err = journal_begin(th, p_s_inode->i_sb, | |
23f9e0f8 | 1883 | JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD + JOURNAL_PER_BALANCE_CNT * 4) ; |
bd4c625c LT |
1884 | if (err) |
1885 | goto out; | |
1886 | reiserfs_update_inode_transaction(p_s_inode); | |
1887 | } | |
1888 | } while (n_file_size > ROUND_UP(n_new_file_size) && | |
1889 | search_for_position_by_key(p_s_inode->i_sb, &s_item_key, | |
1890 | &s_search_path) == POSITION_FOUND); | |
1891 | ||
1892 | RFALSE(n_file_size > ROUND_UP(n_new_file_size), | |
1893 | "PAP-5680: truncate did not finish: new_file_size %Ld, current %Ld, oid %d", | |
1894 | n_new_file_size, n_file_size, s_item_key.on_disk_key.k_objectid); | |
1895 | ||
1896 | update_and_out: | |
1897 | if (update_timestamps) { | |
1898 | // this is truncate, not file closing | |
1899 | p_s_inode->i_mtime = p_s_inode->i_ctime = CURRENT_TIME_SEC; | |
1da177e4 | 1900 | } |
bd4c625c | 1901 | reiserfs_update_sd(th, p_s_inode); |
1da177e4 | 1902 | |
bd4c625c LT |
1903 | out: |
1904 | pathrelse(&s_search_path); | |
1905 | return err; | |
1906 | } | |
1da177e4 LT |
1907 | |
1908 | #ifdef CONFIG_REISERFS_CHECK | |
1909 | // this makes sure, that we __append__, not overwrite or add holes | |
fec6d055 | 1910 | static void check_research_for_paste(struct treepath *path, |
bd4c625c | 1911 | const struct cpu_key *p_s_key) |
1da177e4 | 1912 | { |
bd4c625c LT |
1913 | struct item_head *found_ih = get_ih(path); |
1914 | ||
1915 | if (is_direct_le_ih(found_ih)) { | |
1916 | if (le_ih_k_offset(found_ih) + | |
1917 | op_bytes_number(found_ih, | |
1918 | get_last_bh(path)->b_size) != | |
1919 | cpu_key_k_offset(p_s_key) | |
1920 | || op_bytes_number(found_ih, | |
1921 | get_last_bh(path)->b_size) != | |
1922 | pos_in_item(path)) | |
c3a9c210 JM |
1923 | reiserfs_panic(NULL, "PAP-5720", "found direct item " |
1924 | "%h or position (%d) does not match " | |
1925 | "to key %K", found_ih, | |
1926 | pos_in_item(path), p_s_key); | |
bd4c625c LT |
1927 | } |
1928 | if (is_indirect_le_ih(found_ih)) { | |
1929 | if (le_ih_k_offset(found_ih) + | |
1930 | op_bytes_number(found_ih, | |
1931 | get_last_bh(path)->b_size) != | |
1932 | cpu_key_k_offset(p_s_key) | |
1933 | || I_UNFM_NUM(found_ih) != pos_in_item(path) | |
1934 | || get_ih_free_space(found_ih) != 0) | |
c3a9c210 JM |
1935 | reiserfs_panic(NULL, "PAP-5730", "found indirect " |
1936 | "item (%h) or position (%d) does not " | |
1937 | "match to key (%K)", | |
bd4c625c LT |
1938 | found_ih, pos_in_item(path), p_s_key); |
1939 | } | |
1da177e4 | 1940 | } |
bd4c625c | 1941 | #endif /* config reiserfs check */ |
1da177e4 LT |
1942 | |
1943 | /* Paste bytes to the existing item. Returns bytes number pasted into the item. */ | |
fec6d055 | 1944 | int reiserfs_paste_into_item(struct reiserfs_transaction_handle *th, struct treepath *p_s_search_path, /* Path to the pasted item. */ |
bd4c625c LT |
1945 | const struct cpu_key *p_s_key, /* Key to search for the needed item. */ |
1946 | struct inode *inode, /* Inode item belongs to */ | |
1947 | const char *p_c_body, /* Pointer to the bytes to paste. */ | |
1948 | int n_pasted_size) | |
1949 | { /* Size of pasted bytes. */ | |
1950 | struct tree_balance s_paste_balance; | |
1951 | int retval; | |
1952 | int fs_gen; | |
1953 | ||
1954 | BUG_ON(!th->t_trans_id); | |
1da177e4 | 1955 | |
bd4c625c | 1956 | fs_gen = get_generation(inode->i_sb); |
1da177e4 LT |
1957 | |
1958 | #ifdef REISERQUOTA_DEBUG | |
bd4c625c LT |
1959 | reiserfs_debug(inode->i_sb, REISERFS_DEBUG_CODE, |
1960 | "reiserquota paste_into_item(): allocating %u id=%u type=%c", | |
1961 | n_pasted_size, inode->i_uid, | |
1962 | key2type(&(p_s_key->on_disk_key))); | |
1da177e4 LT |
1963 | #endif |
1964 | ||
bd4c625c LT |
1965 | if (DQUOT_ALLOC_SPACE_NODIRTY(inode, n_pasted_size)) { |
1966 | pathrelse(p_s_search_path); | |
1967 | return -EDQUOT; | |
1968 | } | |
1969 | init_tb_struct(th, &s_paste_balance, th->t_super, p_s_search_path, | |
1970 | n_pasted_size); | |
1da177e4 | 1971 | #ifdef DISPLACE_NEW_PACKING_LOCALITIES |
bd4c625c | 1972 | s_paste_balance.key = p_s_key->on_disk_key; |
1da177e4 LT |
1973 | #endif |
1974 | ||
bd4c625c LT |
1975 | /* DQUOT_* can schedule, must check before the fix_nodes */ |
1976 | if (fs_changed(fs_gen, inode->i_sb)) { | |
1977 | goto search_again; | |
1da177e4 | 1978 | } |
bd4c625c LT |
1979 | |
1980 | while ((retval = | |
1981 | fix_nodes(M_PASTE, &s_paste_balance, NULL, | |
1982 | p_c_body)) == REPEAT_SEARCH) { | |
1983 | search_again: | |
1984 | /* file system changed while we were in the fix_nodes */ | |
1985 | PROC_INFO_INC(th->t_super, paste_into_item_restarted); | |
1986 | retval = | |
1987 | search_for_position_by_key(th->t_super, p_s_key, | |
1988 | p_s_search_path); | |
1989 | if (retval == IO_ERROR) { | |
1990 | retval = -EIO; | |
1991 | goto error_out; | |
1992 | } | |
1993 | if (retval == POSITION_FOUND) { | |
45b03d5e JM |
1994 | reiserfs_warning(inode->i_sb, "PAP-5710", |
1995 | "entry or pasted byte (%K) exists", | |
bd4c625c LT |
1996 | p_s_key); |
1997 | retval = -EEXIST; | |
1998 | goto error_out; | |
1999 | } | |
1da177e4 | 2000 | #ifdef CONFIG_REISERFS_CHECK |
bd4c625c | 2001 | check_research_for_paste(p_s_search_path, p_s_key); |
1da177e4 | 2002 | #endif |
bd4c625c | 2003 | } |
1da177e4 | 2004 | |
bd4c625c LT |
2005 | /* Perform balancing after all resources are collected by fix_nodes, and |
2006 | accessing them will not risk triggering schedule. */ | |
2007 | if (retval == CARRY_ON) { | |
2008 | do_balance(&s_paste_balance, NULL /*ih */ , p_c_body, M_PASTE); | |
2009 | return 0; | |
2010 | } | |
2011 | retval = (retval == NO_DISK_SPACE) ? -ENOSPC : -EIO; | |
2012 | error_out: | |
2013 | /* this also releases the path */ | |
2014 | unfix_nodes(&s_paste_balance); | |
1da177e4 | 2015 | #ifdef REISERQUOTA_DEBUG |
bd4c625c LT |
2016 | reiserfs_debug(inode->i_sb, REISERFS_DEBUG_CODE, |
2017 | "reiserquota paste_into_item(): freeing %u id=%u type=%c", | |
2018 | n_pasted_size, inode->i_uid, | |
2019 | key2type(&(p_s_key->on_disk_key))); | |
1da177e4 | 2020 | #endif |
bd4c625c LT |
2021 | DQUOT_FREE_SPACE_NODIRTY(inode, n_pasted_size); |
2022 | return retval; | |
1da177e4 LT |
2023 | } |
2024 | ||
1da177e4 | 2025 | /* Insert new item into the buffer at the path. */ |
fec6d055 | 2026 | int reiserfs_insert_item(struct reiserfs_transaction_handle *th, struct treepath *p_s_path, /* Path to the inserteded item. */ |
bd4c625c LT |
2027 | const struct cpu_key *key, struct item_head *p_s_ih, /* Pointer to the item header to insert. */ |
2028 | struct inode *inode, const char *p_c_body) | |
2029 | { /* Pointer to the bytes to insert. */ | |
2030 | struct tree_balance s_ins_balance; | |
2031 | int retval; | |
2032 | int fs_gen = 0; | |
2033 | int quota_bytes = 0; | |
2034 | ||
2035 | BUG_ON(!th->t_trans_id); | |
2036 | ||
2037 | if (inode) { /* Do we count quotas for item? */ | |
2038 | fs_gen = get_generation(inode->i_sb); | |
2039 | quota_bytes = ih_item_len(p_s_ih); | |
2040 | ||
2041 | /* hack so the quota code doesn't have to guess if the file has | |
2042 | ** a tail, links are always tails, so there's no guessing needed | |
2043 | */ | |
2044 | if (!S_ISLNK(inode->i_mode) && is_direct_le_ih(p_s_ih)) { | |
2045 | quota_bytes = inode->i_sb->s_blocksize + UNFM_P_SIZE; | |
2046 | } | |
1da177e4 | 2047 | #ifdef REISERQUOTA_DEBUG |
bd4c625c LT |
2048 | reiserfs_debug(inode->i_sb, REISERFS_DEBUG_CODE, |
2049 | "reiserquota insert_item(): allocating %u id=%u type=%c", | |
2050 | quota_bytes, inode->i_uid, head2type(p_s_ih)); | |
1da177e4 | 2051 | #endif |
bd4c625c LT |
2052 | /* We can't dirty inode here. It would be immediately written but |
2053 | * appropriate stat item isn't inserted yet... */ | |
2054 | if (DQUOT_ALLOC_SPACE_NODIRTY(inode, quota_bytes)) { | |
2055 | pathrelse(p_s_path); | |
2056 | return -EDQUOT; | |
2057 | } | |
1da177e4 | 2058 | } |
bd4c625c LT |
2059 | init_tb_struct(th, &s_ins_balance, th->t_super, p_s_path, |
2060 | IH_SIZE + ih_item_len(p_s_ih)); | |
1da177e4 | 2061 | #ifdef DISPLACE_NEW_PACKING_LOCALITIES |
bd4c625c | 2062 | s_ins_balance.key = key->on_disk_key; |
1da177e4 | 2063 | #endif |
bd4c625c LT |
2064 | /* DQUOT_* can schedule, must check to be sure calling fix_nodes is safe */ |
2065 | if (inode && fs_changed(fs_gen, inode->i_sb)) { | |
2066 | goto search_again; | |
1da177e4 | 2067 | } |
bd4c625c LT |
2068 | |
2069 | while ((retval = | |
2070 | fix_nodes(M_INSERT, &s_ins_balance, p_s_ih, | |
2071 | p_c_body)) == REPEAT_SEARCH) { | |
2072 | search_again: | |
2073 | /* file system changed while we were in the fix_nodes */ | |
2074 | PROC_INFO_INC(th->t_super, insert_item_restarted); | |
2075 | retval = search_item(th->t_super, key, p_s_path); | |
2076 | if (retval == IO_ERROR) { | |
2077 | retval = -EIO; | |
2078 | goto error_out; | |
2079 | } | |
2080 | if (retval == ITEM_FOUND) { | |
45b03d5e | 2081 | reiserfs_warning(th->t_super, "PAP-5760", |
bd4c625c LT |
2082 | "key %K already exists in the tree", |
2083 | key); | |
2084 | retval = -EEXIST; | |
2085 | goto error_out; | |
2086 | } | |
1da177e4 | 2087 | } |
1da177e4 | 2088 | |
bd4c625c LT |
2089 | /* make balancing after all resources will be collected at a time */ |
2090 | if (retval == CARRY_ON) { | |
2091 | do_balance(&s_ins_balance, p_s_ih, p_c_body, M_INSERT); | |
2092 | return 0; | |
2093 | } | |
1da177e4 | 2094 | |
bd4c625c LT |
2095 | retval = (retval == NO_DISK_SPACE) ? -ENOSPC : -EIO; |
2096 | error_out: | |
2097 | /* also releases the path */ | |
2098 | unfix_nodes(&s_ins_balance); | |
1da177e4 | 2099 | #ifdef REISERQUOTA_DEBUG |
bd4c625c LT |
2100 | reiserfs_debug(th->t_super, REISERFS_DEBUG_CODE, |
2101 | "reiserquota insert_item(): freeing %u id=%u type=%c", | |
2102 | quota_bytes, inode->i_uid, head2type(p_s_ih)); | |
1da177e4 | 2103 | #endif |
bd4c625c LT |
2104 | if (inode) |
2105 | DQUOT_FREE_SPACE_NODIRTY(inode, quota_bytes); | |
2106 | return retval; | |
1da177e4 | 2107 | } |