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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <linux/time.h>
53#include <linux/string.h>
54#include <linux/pagemap.h>
55#include <linux/reiserfs_fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <linux/buffer_head.h>
57#include <linux/quotaops.h>
58
59/* Does the buffer contain a disk block which is in the tree. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070060inline int B_IS_IN_TREE(const struct buffer_head *p_s_bh)
Linus Torvalds1da177e2005-04-16 15:20:36 -070061{
62
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070063 RFALSE(B_LEVEL(p_s_bh) > MAX_HEIGHT,
64 "PAP-1010: block (%b) has too big level (%z)", p_s_bh, p_s_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070066 return (B_LEVEL(p_s_bh) != FREE_LEVEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067}
68
69//
70// to gets item head in le form
71//
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070072inline void copy_item_head(struct item_head *p_v_to,
73 const struct item_head *p_v_from)
Linus Torvalds1da177e2005-04-16 15:20:36 -070074{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070075 memcpy(p_v_to, p_v_from, IH_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076}
77
Linus Torvalds1da177e2005-04-16 15:20:36 -070078/* 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 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070084inline int comp_short_keys(const struct reiserfs_key *le_key,
85 const struct cpu_key *cpu_key)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070087 __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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099}
100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101/* 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 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700106static inline int comp_keys(const struct reiserfs_key *le_key,
107 const struct cpu_key *cpu_key)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700109 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700111 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700121 if (cpu_key->key_length == 3)
122 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700124 /* 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700129 if (le_key_k_type(le_key_version(le_key), le_key) >
130 cpu_key_k_type(cpu_key))
131 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700133 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134}
135
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700136inline int comp_short_le_keys(const struct reiserfs_key *key1,
137 const struct reiserfs_key *key2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700139 __u32 *p_s_1_u32, *p_s_2_u32;
140 int n_key_length = REISERFS_SHORT_KEY_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700142 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151}
152
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700153inline void le_key2cpu_key(struct cpu_key *to, const struct reiserfs_key *from)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700155 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164}
165
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166// this does not say which one is bigger, it only returns 1 if keys
167// are not equal, 0 otherwise
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700168inline int comp_le_keys(const struct reiserfs_key *k1,
169 const struct reiserfs_key *k2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700171 return memcmp(k1, k2, sizeof(struct reiserfs_key));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172}
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. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700188static 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700204 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700221 /* 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225}
226
227#ifdef CONFIG_REISERFS_CHECK
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700228extern struct tree_balance *cur_tb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229#endif
230
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231/* Minimal possible key. It is never in the tree. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700232const struct reiserfs_key MIN_KEY = { 0, 0, {{0, 0},} };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
234/* Maximal possible key. It is never in the tree. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700235static const struct reiserfs_key MAX_KEY = {
Al Viro3e8962b2005-05-01 08:59:18 -0700236 __constant_cpu_to_le32(0xffffffff),
237 __constant_cpu_to_le32(0xffffffff),
238 {{__constant_cpu_to_le32(0xffffffff),
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700239 __constant_cpu_to_le32(0xffffffff)},}
Al Viro3e8962b2005-05-01 08:59:18 -0700240};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242/* 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. */
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -0800246static inline const struct reiserfs_key *get_lkey(const struct treepath
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700247 *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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700254 RFALSE(n_path_offset < FIRST_PATH_ELEMENT_OFFSET,
255 "PAP-5010: invalid offset in the path");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700257 /* While not higher in path than first element. */
258 while (n_path_offset-- > FIRST_PATH_ELEMENT_OFFSET) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700260 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289}
290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291/* Get delimiting key of the buffer at the path and its right neighbor. */
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -0800292inline const struct reiserfs_key *get_rkey(const struct treepath *p_s_chk_path,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700293 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700298 RFALSE(n_path_offset < FIRST_PATH_ELEMENT_OFFSET,
299 "PAP-5030: invalid offset in the path");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700301 while (n_path_offset-- > FIRST_PATH_ELEMENT_OFFSET) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700303 RFALSE(!buffer_uptodate
304 (PATH_OFFSET_PBUFFER(p_s_chk_path, n_path_offset)),
305 "PAP-5040: parent is not uptodate");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700307 /* 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332}
333
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334/* 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. */
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -0800339static inline int key_in_buffer(struct treepath *p_s_chk_path, /* Path which should be checked. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700340 const struct cpu_key *p_s_key, /* Key which should be checked. */
341 struct super_block *p_s_sb /* Super block pointer. */
342 )
343{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700345 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");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700352 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360}
361
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700362inline 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 }
369 reiserfs_panic(NULL,
370 "PAP-5070: decrement_bcount: trying to free free buffer %b",
371 p_s_bh);
372 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373}
374
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375/* Decrement b_count field of the all buffers in the path. */
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -0800376void decrement_counters_in_path(struct treepath *p_s_search_path)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700377{
378 int n_path_offset = p_s_search_path->path_length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700380 RFALSE(n_path_offset < ILLEGAL_PATH_ELEMENT_OFFSET ||
381 n_path_offset > EXTENDED_MAX_HEIGHT - 1,
382 "PAP-5080: invalid path offset of %d", n_path_offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700384 while (n_path_offset > ILLEGAL_PATH_ELEMENT_OFFSET) {
385 struct buffer_head *bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700387 bh = PATH_OFFSET_PBUFFER(p_s_search_path, n_path_offset--);
388 decrement_bcount(bh);
389 }
390 p_s_search_path->path_length = ILLEGAL_PATH_ELEMENT_OFFSET;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391}
392
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -0800393int reiserfs_check_path(struct treepath *p)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700394{
395 RFALSE(p->path_length != ILLEGAL_PATH_ELEMENT_OFFSET,
396 "path not properly relsed");
397 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398}
399
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400/* Release all buffers in the path. Restore dirty bits clean
401** when preparing the buffer for the log
402**
403** only called from fix_nodes()
404*/
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -0800405void pathrelse_and_restore(struct super_block *s, struct treepath *p_s_search_path)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700406{
407 int n_path_offset = p_s_search_path->path_length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700409 RFALSE(n_path_offset < ILLEGAL_PATH_ELEMENT_OFFSET,
410 "clm-4000: invalid path offset");
411
412 while (n_path_offset > ILLEGAL_PATH_ELEMENT_OFFSET) {
413 reiserfs_restore_prepared_buffer(s,
414 PATH_OFFSET_PBUFFER
415 (p_s_search_path,
416 n_path_offset));
417 brelse(PATH_OFFSET_PBUFFER(p_s_search_path, n_path_offset--));
418 }
419 p_s_search_path->path_length = ILLEGAL_PATH_ELEMENT_OFFSET;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420}
421
422/* Release all buffers in the path. */
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -0800423void pathrelse(struct treepath *p_s_search_path)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700425 int n_path_offset = p_s_search_path->path_length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700427 RFALSE(n_path_offset < ILLEGAL_PATH_ELEMENT_OFFSET,
428 "PAP-5090: invalid path offset");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700430 while (n_path_offset > ILLEGAL_PATH_ELEMENT_OFFSET)
431 brelse(PATH_OFFSET_PBUFFER(p_s_search_path, n_path_offset--));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700433 p_s_search_path->path_length = ILLEGAL_PATH_ELEMENT_OFFSET;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434}
435
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700436static int is_leaf(char *buf, int blocksize, struct buffer_head *bh)
437{
438 struct block_head *blkh;
439 struct item_head *ih;
440 int used_space;
441 int prev_location;
442 int i;
443 int nr;
444
445 blkh = (struct block_head *)buf;
446 if (blkh_level(blkh) != DISK_LEAF_NODE_LEVEL) {
447 reiserfs_warning(NULL,
448 "is_leaf: this should be caught earlier");
449 return 0;
450 }
451
452 nr = blkh_nr_item(blkh);
453 if (nr < 1 || nr > ((blocksize - BLKH_SIZE) / (IH_SIZE + MIN_ITEM_LEN))) {
454 /* item number is too big or too small */
455 reiserfs_warning(NULL, "is_leaf: nr_item seems wrong: %z", bh);
456 return 0;
457 }
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 */
462 reiserfs_warning(NULL, "is_leaf: free space seems wrong: %z",
463 bh);
464 return 0;
465 }
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) {
474 reiserfs_warning(NULL,
475 "is_leaf: wrong item type for item %h",
476 ih);
477 return 0;
478 }
479 if (ih_location(ih) >= blocksize
480 || ih_location(ih) < IH_SIZE * nr) {
481 reiserfs_warning(NULL,
482 "is_leaf: item location seems wrong: %h",
483 ih);
484 return 0;
485 }
486 if (ih_item_len(ih) < 1
487 || ih_item_len(ih) > MAX_ITEM_LEN(blocksize)) {
488 reiserfs_warning(NULL,
489 "is_leaf: item length seems wrong: %h",
490 ih);
491 return 0;
492 }
493 if (prev_location - ih_location(ih) != ih_item_len(ih)) {
494 reiserfs_warning(NULL,
495 "is_leaf: item location seems wrong (second one): %h",
496 ih);
497 return 0;
498 }
499 prev_location = ih_location(ih);
500 }
501
502 // one may imagine much more checks
503 return 1;
504}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505
506/* returns 1 if buf looks like an internal node, 0 otherwise */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700507static int is_internal(char *buf, int blocksize, struct buffer_head *bh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700509 struct block_head *blkh;
510 int nr;
511 int used_space;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700513 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 */
517 reiserfs_warning(NULL,
518 "is_internal: this should be caught earlier");
519 return 0;
520 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700522 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 */
525 reiserfs_warning(NULL,
526 "is_internal: number of key seems wrong: %z",
527 bh);
528 return 0;
529 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700531 used_space = BLKH_SIZE + KEY_SIZE * nr + DC_SIZE * (nr + 1);
532 if (used_space != blocksize - blkh_free_space(blkh)) {
533 reiserfs_warning(NULL,
534 "is_internal: free space seems wrong: %z", bh);
535 return 0;
536 }
537 // one may imagine much more checks
538 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539}
540
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541// make sure that bh contains formatted node of reiserfs tree of
542// 'level'-th level
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700543static int is_tree_node(struct buffer_head *bh, int level)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700545 if (B_LEVEL(bh) != level) {
546 reiserfs_warning(NULL,
547 "is_tree_node: node level %d does not match to the expected one %d",
548 B_LEVEL(bh), level);
549 return 0;
550 }
551 if (level == DISK_LEAF_NODE_LEVEL)
552 return is_leaf(bh->b_data, bh->b_size, bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700554 return is_internal(bh->b_data, bh->b_size, bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555}
556
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557#define SEARCH_BY_KEY_READA 16
558
559/* The function is NOT SCHEDULE-SAFE! */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700560static void search_by_key_reada(struct super_block *s,
561 struct buffer_head **bh,
Jeff Mahoney3ee16672007-10-18 23:39:25 -0700562 b_blocknr_t *b, int num)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700564 int i, j;
565
566 for (i = 0; i < num; i++) {
567 bh[i] = sb_getblk(s, b[i]);
568 }
569 for (j = 0; j < i; j++) {
570 /*
571 * note, this needs attention if we are getting rid of the BKL
572 * you have to make sure the prepared bit isn't set on this buffer
573 */
574 if (!buffer_uptodate(bh[j]))
575 ll_rw_block(READA, 1, bh + j);
576 brelse(bh[j]);
577 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578}
579
580/**************************************************************************
581 * Algorithm SearchByKey *
582 * look for item in the Disk S+Tree by its key *
583 * Input: p_s_sb - super block *
584 * p_s_key - pointer to the key to search *
585 * Output: ITEM_FOUND, ITEM_NOT_FOUND or IO_ERROR *
586 * p_s_search_path - path from the root to the needed leaf *
587 **************************************************************************/
588
589/* This function fills up the path from the root to the leaf as it
590 descends the tree looking for the key. It uses reiserfs_bread to
591 try to find buffers in the cache given their block number. If it
592 does not find them in the cache it reads them from disk. For each
593 node search_by_key finds using reiserfs_bread it then uses
594 bin_search to look through that node. bin_search will find the
595 position of the block_number of the next node if it is looking
596 through an internal node. If it is looking through a leaf node
597 bin_search will find the position of the item which has key either
598 equal to given key, or which is the maximal key less than the given
599 key. search_by_key returns a path that must be checked for the
600 correctness of the top of the path but need not be checked for the
601 correctness of the bottom of the path */
602/* The function is NOT SCHEDULE-SAFE! */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700603int search_by_key(struct super_block *p_s_sb, const struct cpu_key *p_s_key, /* Key to search. */
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -0800604 struct treepath *p_s_search_path,/* This structure was
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700605 allocated and initialized
606 by the calling
607 function. It is filled up
608 by this function. */
609 int n_stop_level /* How far down the tree to search. To
610 stop at leaf level - set to
611 DISK_LEAF_NODE_LEVEL */
612 )
613{
Jeff Mahoney3ee16672007-10-18 23:39:25 -0700614 b_blocknr_t n_block_number;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700615 int expected_level;
616 struct buffer_head *p_s_bh;
617 struct path_element *p_s_last_element;
618 int n_node_level, n_retval;
619 int right_neighbor_of_leaf_node;
620 int fs_gen;
621 struct buffer_head *reada_bh[SEARCH_BY_KEY_READA];
Jeff Mahoney3ee16672007-10-18 23:39:25 -0700622 b_blocknr_t reada_blocks[SEARCH_BY_KEY_READA];
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700623 int reada_count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624
625#ifdef CONFIG_REISERFS_CHECK
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700626 int n_repeat_counter = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700629 PROC_INFO_INC(p_s_sb, search_by_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700631 /* As we add each node to a path we increase its count. This means that
632 we must be careful to release all nodes in a path before we either
633 discard the path struct or re-use the path struct, as we do here. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700635 decrement_counters_in_path(p_s_search_path);
636
637 right_neighbor_of_leaf_node = 0;
638
639 /* With each iteration of this loop we search through the items in the
640 current node, and calculate the next current node(next path element)
641 for the next iteration of this loop.. */
642 n_block_number = SB_ROOT_BLOCK(p_s_sb);
643 expected_level = -1;
644 while (1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645
646#ifdef CONFIG_REISERFS_CHECK
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700647 if (!(++n_repeat_counter % 50000))
648 reiserfs_warning(p_s_sb, "PAP-5100: search_by_key: %s:"
649 "there were %d iterations of while loop "
650 "looking for key %K",
651 current->comm, n_repeat_counter,
652 p_s_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653#endif
654
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700655 /* prep path to have another element added to it. */
656 p_s_last_element =
657 PATH_OFFSET_PELEMENT(p_s_search_path,
658 ++p_s_search_path->path_length);
659 fs_gen = get_generation(p_s_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700661 /* Read the next tree node, and set the last element in the path to
662 have a pointer to it. */
663 if ((p_s_bh = p_s_last_element->pe_buffer =
664 sb_getblk(p_s_sb, n_block_number))) {
665 if (!buffer_uptodate(p_s_bh) && reada_count > 1) {
666 search_by_key_reada(p_s_sb, reada_bh,
667 reada_blocks, reada_count);
668 }
669 ll_rw_block(READ, 1, &p_s_bh);
670 wait_on_buffer(p_s_bh);
671 if (!buffer_uptodate(p_s_bh))
672 goto io_error;
673 } else {
674 io_error:
675 p_s_search_path->path_length--;
676 pathrelse(p_s_search_path);
677 return IO_ERROR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700679 reada_count = 0;
680 if (expected_level == -1)
681 expected_level = SB_TREE_HEIGHT(p_s_sb);
682 expected_level--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700684 /* It is possible that schedule occurred. We must check whether the key
685 to search is still in the tree rooted from the current buffer. If
686 not then repeat search from the root. */
687 if (fs_changed(fs_gen, p_s_sb) &&
688 (!B_IS_IN_TREE(p_s_bh) ||
689 B_LEVEL(p_s_bh) != expected_level ||
690 !key_in_buffer(p_s_search_path, p_s_key, p_s_sb))) {
691 PROC_INFO_INC(p_s_sb, search_by_key_fs_changed);
692 PROC_INFO_INC(p_s_sb, search_by_key_restarted);
693 PROC_INFO_INC(p_s_sb,
694 sbk_restarted[expected_level - 1]);
695 decrement_counters_in_path(p_s_search_path);
696
697 /* Get the root block number so that we can repeat the search
698 starting from the root. */
699 n_block_number = SB_ROOT_BLOCK(p_s_sb);
700 expected_level = -1;
701 right_neighbor_of_leaf_node = 0;
702
703 /* repeat search from the root */
704 continue;
705 }
706
707 /* only check that the key is in the buffer if p_s_key is not
708 equal to the MAX_KEY. Latter case is only possible in
709 "finish_unfinished()" processing during mount. */
710 RFALSE(comp_keys(&MAX_KEY, p_s_key) &&
711 !key_in_buffer(p_s_search_path, p_s_key, p_s_sb),
712 "PAP-5130: key is not in the buffer");
713#ifdef CONFIG_REISERFS_CHECK
714 if (cur_tb) {
715 print_cur_tb("5140");
716 reiserfs_panic(p_s_sb,
717 "PAP-5140: search_by_key: schedule occurred in do_balance!");
718 }
719#endif
720
721 // make sure, that the node contents look like a node of
722 // certain level
723 if (!is_tree_node(p_s_bh, expected_level)) {
724 reiserfs_warning(p_s_sb, "vs-5150: search_by_key: "
725 "invalid format found in block %ld. Fsck?",
726 p_s_bh->b_blocknr);
727 pathrelse(p_s_search_path);
728 return IO_ERROR;
729 }
730
731 /* ok, we have acquired next formatted node in the tree */
732 n_node_level = B_LEVEL(p_s_bh);
733
734 PROC_INFO_BH_STAT(p_s_sb, p_s_bh, n_node_level - 1);
735
736 RFALSE(n_node_level < n_stop_level,
737 "vs-5152: tree level (%d) is less than stop level (%d)",
738 n_node_level, n_stop_level);
739
740 n_retval = bin_search(p_s_key, B_N_PITEM_HEAD(p_s_bh, 0),
741 B_NR_ITEMS(p_s_bh),
742 (n_node_level ==
743 DISK_LEAF_NODE_LEVEL) ? IH_SIZE :
744 KEY_SIZE,
745 &(p_s_last_element->pe_position));
746 if (n_node_level == n_stop_level) {
747 return n_retval;
748 }
749
750 /* we are not in the stop level */
751 if (n_retval == ITEM_FOUND)
752 /* item has been found, so we choose the pointer which is to the right of the found one */
753 p_s_last_element->pe_position++;
754
755 /* if item was not found we choose the position which is to
756 the left of the found item. This requires no code,
757 bin_search did it already. */
758
759 /* So we have chosen a position in the current node which is
760 an internal node. Now we calculate child block number by
761 position in the node. */
762 n_block_number =
763 B_N_CHILD_NUM(p_s_bh, p_s_last_element->pe_position);
764
765 /* if we are going to read leaf nodes, try for read ahead as well */
766 if ((p_s_search_path->reada & PATH_READA) &&
767 n_node_level == DISK_LEAF_NODE_LEVEL + 1) {
768 int pos = p_s_last_element->pe_position;
769 int limit = B_NR_ITEMS(p_s_bh);
770 struct reiserfs_key *le_key;
771
772 if (p_s_search_path->reada & PATH_READA_BACK)
773 limit = 0;
774 while (reada_count < SEARCH_BY_KEY_READA) {
775 if (pos == limit)
776 break;
777 reada_blocks[reada_count++] =
778 B_N_CHILD_NUM(p_s_bh, pos);
779 if (p_s_search_path->reada & PATH_READA_BACK)
780 pos--;
781 else
782 pos++;
783
784 /*
785 * check to make sure we're in the same object
786 */
787 le_key = B_N_PDELIM_KEY(p_s_bh, pos);
788 if (le32_to_cpu(le_key->k_objectid) !=
789 p_s_key->on_disk_key.k_objectid) {
790 break;
791 }
792 }
793 }
794 }
795}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796
797/* Form the path to an item and position in this item which contains
798 file byte defined by p_s_key. If there is no such item
799 corresponding to the key, we point the path to the item with
800 maximal key less than p_s_key, and *p_n_pos_in_item is set to one
801 past the last entry/byte in the item. If searching for entry in a
802 directory item, and it is not found, *p_n_pos_in_item is set to one
803 entry more than the entry with maximal key which is less than the
804 sought key.
805
806 Note that if there is no entry in this same node which is one more,
807 then we point to an imaginary entry. for direct items, the
808 position is in units of bytes, for indirect items the position is
809 in units of blocknr entries, for directory items the position is in
810 units of directory entries. */
811
812/* The function is NOT SCHEDULE-SAFE! */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700813int search_for_position_by_key(struct super_block *p_s_sb, /* Pointer to the super block. */
814 const struct cpu_key *p_cpu_key, /* Key to search (cpu variable) */
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -0800815 struct treepath *p_s_search_path /* Filled up by this function. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700816 )
817{
818 struct item_head *p_le_ih; /* pointer to on-disk structure */
819 int n_blk_size;
820 loff_t item_offset, offset;
821 struct reiserfs_dir_entry de;
822 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700824 /* If searching for directory entry. */
825 if (is_direntry_cpu_key(p_cpu_key))
826 return search_by_entry_key(p_s_sb, p_cpu_key, p_s_search_path,
827 &de);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700829 /* If not searching for directory entry. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700831 /* If item is found. */
832 retval = search_item(p_s_sb, p_cpu_key, p_s_search_path);
833 if (retval == IO_ERROR)
834 return retval;
835 if (retval == ITEM_FOUND) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700837 RFALSE(!ih_item_len
838 (B_N_PITEM_HEAD
839 (PATH_PLAST_BUFFER(p_s_search_path),
840 PATH_LAST_POSITION(p_s_search_path))),
841 "PAP-5165: item length equals zero");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700843 pos_in_item(p_s_search_path) = 0;
844 return POSITION_FOUND;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700847 RFALSE(!PATH_LAST_POSITION(p_s_search_path),
848 "PAP-5170: position equals zero");
849
850 /* Item is not found. Set path to the previous item. */
851 p_le_ih =
852 B_N_PITEM_HEAD(PATH_PLAST_BUFFER(p_s_search_path),
853 --PATH_LAST_POSITION(p_s_search_path));
854 n_blk_size = p_s_sb->s_blocksize;
855
856 if (comp_short_keys(&(p_le_ih->ih_key), p_cpu_key)) {
857 return FILE_NOT_FOUND;
858 }
859 // FIXME: quite ugly this far
860
861 item_offset = le_ih_k_offset(p_le_ih);
862 offset = cpu_key_k_offset(p_cpu_key);
863
864 /* Needed byte is contained in the item pointed to by the path. */
865 if (item_offset <= offset &&
866 item_offset + op_bytes_number(p_le_ih, n_blk_size) > offset) {
867 pos_in_item(p_s_search_path) = offset - item_offset;
868 if (is_indirect_le_ih(p_le_ih)) {
869 pos_in_item(p_s_search_path) /= n_blk_size;
870 }
871 return POSITION_FOUND;
872 }
873
874 /* Needed byte is not contained in the item pointed to by the
875 path. Set pos_in_item out of the item. */
876 if (is_indirect_le_ih(p_le_ih))
877 pos_in_item(p_s_search_path) =
878 ih_item_len(p_le_ih) / UNFM_P_SIZE;
879 else
880 pos_in_item(p_s_search_path) = ih_item_len(p_le_ih);
881
882 return POSITION_NOT_FOUND;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883}
884
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885/* Compare given item and item pointed to by the path. */
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -0800886int comp_items(const struct item_head *stored_ih, const struct treepath *p_s_path)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700888 struct buffer_head *p_s_bh;
889 struct item_head *ih;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700891 /* Last buffer at the path is not in the tree. */
892 if (!B_IS_IN_TREE(p_s_bh = PATH_PLAST_BUFFER(p_s_path)))
893 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700895 /* Last path position is invalid. */
896 if (PATH_LAST_POSITION(p_s_path) >= B_NR_ITEMS(p_s_bh))
897 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700899 /* we need only to know, whether it is the same item */
900 ih = get_ih(p_s_path);
901 return memcmp(stored_ih, ih, IH_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902}
903
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904/* unformatted nodes are not logged anymore, ever. This is safe
905** now
906*/
907#define held_by_others(bh) (atomic_read(&(bh)->b_count) > 1)
908
909// block can not be forgotten as it is in I/O or held by someone
910#define block_in_use(bh) (buffer_locked(bh) || (held_by_others(bh)))
911
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912// prepare for delete or cut of direct item
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -0800913static inline int prepare_for_direct_item(struct treepath *path,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700914 struct item_head *le_ih,
915 struct inode *inode,
916 loff_t new_file_length, int *cut_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700918 loff_t round_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700920 if (new_file_length == max_reiserfs_offset(inode)) {
921 /* item has to be deleted */
922 *cut_size = -(IH_SIZE + ih_item_len(le_ih));
923 return M_DELETE;
924 }
925 // new file gets truncated
926 if (get_inode_item_key_version(inode) == KEY_FORMAT_3_6) {
927 //
928 round_len = ROUND_UP(new_file_length);
929 /* this was n_new_file_length < le_ih ... */
930 if (round_len < le_ih_k_offset(le_ih)) {
931 *cut_size = -(IH_SIZE + ih_item_len(le_ih));
932 return M_DELETE; /* Delete this item. */
933 }
934 /* Calculate first position and size for cutting from item. */
935 pos_in_item(path) = round_len - (le_ih_k_offset(le_ih) - 1);
936 *cut_size = -(ih_item_len(le_ih) - pos_in_item(path));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700938 return M_CUT; /* Cut from this item. */
939 }
940
941 // old file: items may have any length
942
943 if (new_file_length < le_ih_k_offset(le_ih)) {
944 *cut_size = -(IH_SIZE + ih_item_len(le_ih));
945 return M_DELETE; /* Delete this item. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 }
947 /* Calculate first position and size for cutting from item. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700948 *cut_size = -(ih_item_len(le_ih) -
949 (pos_in_item(path) =
950 new_file_length + 1 - le_ih_k_offset(le_ih)));
951 return M_CUT; /* Cut from this item. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952}
953
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -0800954static inline int prepare_for_direntry_item(struct treepath *path,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700955 struct item_head *le_ih,
956 struct inode *inode,
957 loff_t new_file_length,
958 int *cut_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700960 if (le_ih_k_offset(le_ih) == DOT_OFFSET &&
961 new_file_length == max_reiserfs_offset(inode)) {
962 RFALSE(ih_entry_count(le_ih) != 2,
963 "PAP-5220: incorrect empty directory item (%h)", le_ih);
964 *cut_size = -(IH_SIZE + ih_item_len(le_ih));
965 return M_DELETE; /* Delete the directory item containing "." and ".." entry. */
966 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700968 if (ih_entry_count(le_ih) == 1) {
969 /* Delete the directory item such as there is one record only
970 in this item */
971 *cut_size = -(IH_SIZE + ih_item_len(le_ih));
972 return M_DELETE;
973 }
974
975 /* Cut one record from the directory item. */
976 *cut_size =
977 -(DEH_SIZE +
978 entry_length(get_last_bh(path), le_ih, pos_in_item(path)));
979 return M_CUT;
980}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981
Alexander Zarochentzev23f9e0f2006-03-25 03:06:57 -0800982#define JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD (2 * JOURNAL_PER_BALANCE_CNT + 1)
983
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984/* If the path points to a directory or direct item, calculate mode and the size cut, for balance.
985 If the path points to an indirect item, remove some number of its unformatted nodes.
986 In case of file truncate calculate whether this item must be deleted/truncated or last
987 unformatted node of this item will be converted to a direct item.
988 This function returns a determination of what balance mode the calling function should employ. */
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -0800989static 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
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700990 from end of the file. */
991 int *p_n_cut_size, unsigned long long n_new_file_length /* MAX_KEY_OFFSET in case of delete. */
992 )
993{
994 struct super_block *p_s_sb = inode->i_sb;
995 struct item_head *p_le_ih = PATH_PITEM_HEAD(p_s_path);
996 struct buffer_head *p_s_bh = PATH_PLAST_BUFFER(p_s_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700998 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001000 /* Stat_data item. */
1001 if (is_statdata_le_ih(p_le_ih)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001003 RFALSE(n_new_file_length != max_reiserfs_offset(inode),
1004 "PAP-5210: mode must be M_DELETE");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001006 *p_n_cut_size = -(IH_SIZE + ih_item_len(p_le_ih));
1007 return M_DELETE;
1008 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001010 /* Directory item. */
1011 if (is_direntry_le_ih(p_le_ih))
1012 return prepare_for_direntry_item(p_s_path, p_le_ih, inode,
1013 n_new_file_length,
1014 p_n_cut_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001016 /* Direct item. */
1017 if (is_direct_le_ih(p_le_ih))
1018 return prepare_for_direct_item(p_s_path, p_le_ih, inode,
1019 n_new_file_length, p_n_cut_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001021 /* Case of an indirect item. */
1022 {
Alexander Zarochentzev23f9e0f2006-03-25 03:06:57 -08001023 int blk_size = p_s_sb->s_blocksize;
1024 struct item_head s_ih;
1025 int need_re_search;
1026 int delete = 0;
1027 int result = M_CUT;
1028 int pos = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029
Alexander Zarochentzev23f9e0f2006-03-25 03:06:57 -08001030 if ( n_new_file_length == max_reiserfs_offset (inode) ) {
1031 /* prepare_for_delete_or_cut() is called by
1032 * reiserfs_delete_item() */
1033 n_new_file_length = 0;
1034 delete = 1;
1035 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036
Alexander Zarochentzev23f9e0f2006-03-25 03:06:57 -08001037 do {
1038 need_re_search = 0;
1039 *p_n_cut_size = 0;
1040 p_s_bh = PATH_PLAST_BUFFER(p_s_path);
1041 copy_item_head(&s_ih, PATH_PITEM_HEAD(p_s_path));
1042 pos = I_UNFM_NUM(&s_ih);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043
Alexander Zarochentzev23f9e0f2006-03-25 03:06:57 -08001044 while (le_ih_k_offset (&s_ih) + (pos - 1) * blk_size > n_new_file_length) {
Al Viro87588dd2007-07-26 17:47:03 +01001045 __le32 *unfm;
1046 __u32 block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047
Alexander Zarochentzev23f9e0f2006-03-25 03:06:57 -08001048 /* Each unformatted block deletion may involve one additional
1049 * bitmap block into the transaction, thereby the initial
1050 * journal space reservation might not be enough. */
1051 if (!delete && (*p_n_cut_size) != 0 &&
1052 reiserfs_transaction_free_space(th) < JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD) {
1053 break;
1054 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055
Al Viro87588dd2007-07-26 17:47:03 +01001056 unfm = (__le32 *)B_I_PITEM(p_s_bh, &s_ih) + pos - 1;
Alexander Zarochentzev23f9e0f2006-03-25 03:06:57 -08001057 block = get_block_num(unfm, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058
Alexander Zarochentzev23f9e0f2006-03-25 03:06:57 -08001059 if (block != 0) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001060 reiserfs_prepare_for_journal(p_s_sb, p_s_bh, 1);
Alexander Zarochentzev23f9e0f2006-03-25 03:06:57 -08001061 put_block_num(unfm, 0, 0);
1062 journal_mark_dirty (th, p_s_sb, p_s_bh);
1063 reiserfs_free_block(th, inode, block, 1);
1064 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065
Alexander Zarochentzev23f9e0f2006-03-25 03:06:57 -08001066 cond_resched();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067
Alexander Zarochentzev23f9e0f2006-03-25 03:06:57 -08001068 if (item_moved (&s_ih, p_s_path)) {
1069 need_re_search = 1;
1070 break;
1071 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072
Alexander Zarochentzev23f9e0f2006-03-25 03:06:57 -08001073 pos --;
1074 (*p_n_removed) ++;
1075 (*p_n_cut_size) -= UNFM_P_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076
Alexander Zarochentzev23f9e0f2006-03-25 03:06:57 -08001077 if (pos == 0) {
1078 (*p_n_cut_size) -= IH_SIZE;
1079 result = M_DELETE;
1080 break;
1081 }
1082 }
1083 /* a trick. If the buffer has been logged, this will do nothing. If
1084 ** we've broken the loop without logging it, it will restore the
1085 ** buffer */
1086 reiserfs_restore_prepared_buffer(p_s_sb, p_s_bh);
1087 } while (need_re_search &&
1088 search_for_position_by_key(p_s_sb, p_s_item_key, p_s_path) == POSITION_FOUND);
1089 pos_in_item(p_s_path) = pos * UNFM_P_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090
Alexander Zarochentzev23f9e0f2006-03-25 03:06:57 -08001091 if (*p_n_cut_size == 0) {
1092 /* Nothing were cut. maybe convert last unformatted node to the
1093 * direct item? */
1094 result = M_CONVERT;
1095 }
1096 return result;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001097 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098}
1099
1100/* Calculate number of bytes which will be deleted or cut during balance */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001101static int calc_deleted_bytes_number(struct tree_balance *p_s_tb, char c_mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001103 int n_del_size;
1104 struct item_head *p_le_ih = PATH_PITEM_HEAD(p_s_tb->tb_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001106 if (is_statdata_le_ih(p_le_ih))
1107 return 0;
1108
1109 n_del_size =
1110 (c_mode ==
1111 M_DELETE) ? ih_item_len(p_le_ih) : -p_s_tb->insert_size[0];
1112 if (is_direntry_le_ih(p_le_ih)) {
1113 // return EMPTY_DIR_SIZE; /* We delete emty directoris only. */
1114 // we can't use EMPTY_DIR_SIZE, as old format dirs have a different
1115 // empty size. ick. FIXME, is this right?
1116 //
1117 return n_del_size;
1118 }
1119
1120 if (is_indirect_le_ih(p_le_ih))
1121 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);
1122 return n_del_size;
1123}
1124
1125static void init_tb_struct(struct reiserfs_transaction_handle *th,
1126 struct tree_balance *p_s_tb,
1127 struct super_block *p_s_sb,
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001128 struct treepath *p_s_path, int n_size)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001129{
1130
1131 BUG_ON(!th->t_trans_id);
1132
1133 memset(p_s_tb, '\0', sizeof(struct tree_balance));
1134 p_s_tb->transaction_handle = th;
1135 p_s_tb->tb_sb = p_s_sb;
1136 p_s_tb->tb_path = p_s_path;
1137 PATH_OFFSET_PBUFFER(p_s_path, ILLEGAL_PATH_ELEMENT_OFFSET) = NULL;
1138 PATH_OFFSET_POSITION(p_s_path, ILLEGAL_PATH_ELEMENT_OFFSET) = 0;
1139 p_s_tb->insert_size[0] = n_size;
1140}
1141
1142void padd_item(char *item, int total_length, int length)
1143{
1144 int i;
1145
1146 for (i = total_length; i > length;)
1147 item[--i] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148}
1149
1150#ifdef REISERQUOTA_DEBUG
1151char key2type(struct reiserfs_key *ih)
1152{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001153 if (is_direntry_le_key(2, ih))
1154 return 'd';
1155 if (is_direct_le_key(2, ih))
1156 return 'D';
1157 if (is_indirect_le_key(2, ih))
1158 return 'i';
1159 if (is_statdata_le_key(2, ih))
1160 return 's';
1161 return 'u';
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162}
1163
1164char head2type(struct item_head *ih)
1165{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001166 if (is_direntry_le_ih(ih))
1167 return 'd';
1168 if (is_direct_le_ih(ih))
1169 return 'D';
1170 if (is_indirect_le_ih(ih))
1171 return 'i';
1172 if (is_statdata_le_ih(ih))
1173 return 's';
1174 return 'u';
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175}
1176#endif
1177
1178/* Delete object item. */
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001179int reiserfs_delete_item(struct reiserfs_transaction_handle *th, struct treepath *p_s_path, /* Path to the deleted item. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001180 const struct cpu_key *p_s_item_key, /* Key to search for the deleted item. */
1181 struct inode *p_s_inode, /* inode is here just to update i_blocks and quotas */
1182 struct buffer_head *p_s_un_bh)
1183{ /* NULL or unformatted node pointer. */
1184 struct super_block *p_s_sb = p_s_inode->i_sb;
1185 struct tree_balance s_del_balance;
1186 struct item_head s_ih;
1187 struct item_head *q_ih;
1188 int quota_cut_bytes;
1189 int n_ret_value, n_del_size, n_removed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190
1191#ifdef CONFIG_REISERFS_CHECK
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001192 char c_mode;
1193 int n_iter = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194#endif
1195
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001196 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001198 init_tb_struct(th, &s_del_balance, p_s_sb, p_s_path,
1199 0 /*size is unknown */ );
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001201 while (1) {
1202 n_removed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203
1204#ifdef CONFIG_REISERFS_CHECK
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001205 n_iter++;
1206 c_mode =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001208 prepare_for_delete_or_cut(th, p_s_inode, p_s_path,
1209 p_s_item_key, &n_removed,
1210 &n_del_size,
1211 max_reiserfs_offset(p_s_inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001213 RFALSE(c_mode != M_DELETE, "PAP-5320: mode must be M_DELETE");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001215 copy_item_head(&s_ih, PATH_PITEM_HEAD(p_s_path));
1216 s_del_balance.insert_size[0] = n_del_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001218 n_ret_value = fix_nodes(M_DELETE, &s_del_balance, NULL, NULL);
1219 if (n_ret_value != REPEAT_SEARCH)
1220 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001222 PROC_INFO_INC(p_s_sb, delete_item_restarted);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001224 // file system changed, repeat search
1225 n_ret_value =
1226 search_for_position_by_key(p_s_sb, p_s_item_key, p_s_path);
1227 if (n_ret_value == IO_ERROR)
1228 break;
1229 if (n_ret_value == FILE_NOT_FOUND) {
1230 reiserfs_warning(p_s_sb,
1231 "vs-5340: reiserfs_delete_item: "
1232 "no items of the file %K found",
1233 p_s_item_key);
1234 break;
1235 }
1236 } /* while (1) */
1237
1238 if (n_ret_value != CARRY_ON) {
1239 unfix_nodes(&s_del_balance);
1240 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001242 // reiserfs_delete_item returns item length when success
1243 n_ret_value = calc_deleted_bytes_number(&s_del_balance, M_DELETE);
1244 q_ih = get_ih(p_s_path);
1245 quota_cut_bytes = ih_item_len(q_ih);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001247 /* hack so the quota code doesn't have to guess if the file
1248 ** has a tail. On tail insert, we allocate quota for 1 unformatted node.
1249 ** We test the offset because the tail might have been
1250 ** split into multiple items, and we only want to decrement for
1251 ** the unfm node once
1252 */
1253 if (!S_ISLNK(p_s_inode->i_mode) && is_direct_le_ih(q_ih)) {
1254 if ((le_ih_k_offset(q_ih) & (p_s_sb->s_blocksize - 1)) == 1) {
1255 quota_cut_bytes = p_s_sb->s_blocksize + UNFM_P_SIZE;
1256 } else {
1257 quota_cut_bytes = 0;
1258 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001261 if (p_s_un_bh) {
1262 int off;
1263 char *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001265 /* We are in direct2indirect conversion, so move tail contents
1266 to the unformatted node */
1267 /* note, we do the copy before preparing the buffer because we
1268 ** don't care about the contents of the unformatted node yet.
1269 ** the only thing we really care about is the direct item's data
1270 ** is in the unformatted node.
1271 **
1272 ** Otherwise, we would have to call reiserfs_prepare_for_journal on
1273 ** the unformatted node, which might schedule, meaning we'd have to
1274 ** loop all the way back up to the start of the while loop.
1275 **
1276 ** The unformatted node must be dirtied later on. We can't be
1277 ** sure here if the entire tail has been deleted yet.
1278 **
1279 ** p_s_un_bh is from the page cache (all unformatted nodes are
1280 ** from the page cache) and might be a highmem page. So, we
1281 ** can't use p_s_un_bh->b_data.
1282 ** -clm
1283 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001285 data = kmap_atomic(p_s_un_bh->b_page, KM_USER0);
1286 off = ((le_ih_k_offset(&s_ih) - 1) & (PAGE_CACHE_SIZE - 1));
1287 memcpy(data + off,
1288 B_I_PITEM(PATH_PLAST_BUFFER(p_s_path), &s_ih),
1289 n_ret_value);
1290 kunmap_atomic(data, KM_USER0);
1291 }
1292 /* Perform balancing after all resources have been collected at once. */
1293 do_balance(&s_del_balance, NULL, NULL, M_DELETE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294
1295#ifdef REISERQUOTA_DEBUG
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001296 reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
1297 "reiserquota delete_item(): freeing %u, id=%u type=%c",
1298 quota_cut_bytes, p_s_inode->i_uid, head2type(&s_ih));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001300 DQUOT_FREE_SPACE_NODIRTY(p_s_inode, quota_cut_bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001302 /* Return deleted body length */
1303 return n_ret_value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304}
1305
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306/* Summary Of Mechanisms For Handling Collisions Between Processes:
1307
1308 deletion of the body of the object is performed by iput(), with the
1309 result that if multiple processes are operating on a file, the
1310 deletion of the body of the file is deferred until the last process
1311 that has an open inode performs its iput().
1312
1313 writes and truncates are protected from collisions by use of
1314 semaphores.
1315
1316 creates, linking, and mknod are protected from collisions with other
1317 processes by making the reiserfs_add_entry() the last step in the
1318 creation, and then rolling back all changes if there was a collision.
1319 - Hans
1320*/
1321
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322/* this deletes item which never gets split */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001323void reiserfs_delete_solid_item(struct reiserfs_transaction_handle *th,
1324 struct inode *inode, struct reiserfs_key *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001326 struct tree_balance tb;
1327 INITIALIZE_PATH(path);
1328 int item_len = 0;
1329 int tb_init = 0;
1330 struct cpu_key cpu_key;
1331 int retval;
1332 int quota_cut_bytes = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001334 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001336 le_key2cpu_key(&cpu_key, key);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001338 while (1) {
1339 retval = search_item(th->t_super, &cpu_key, &path);
1340 if (retval == IO_ERROR) {
1341 reiserfs_warning(th->t_super,
1342 "vs-5350: reiserfs_delete_solid_item: "
1343 "i/o failure occurred trying to delete %K",
1344 &cpu_key);
1345 break;
1346 }
1347 if (retval != ITEM_FOUND) {
1348 pathrelse(&path);
1349 // No need for a warning, if there is just no free space to insert '..' item into the newly-created subdir
1350 if (!
1351 ((unsigned long long)
1352 GET_HASH_VALUE(le_key_k_offset
1353 (le_key_version(key), key)) == 0
1354 && (unsigned long long)
1355 GET_GENERATION_NUMBER(le_key_k_offset
1356 (le_key_version(key),
1357 key)) == 1))
1358 reiserfs_warning(th->t_super,
1359 "vs-5355: reiserfs_delete_solid_item: %k not found",
1360 key);
1361 break;
1362 }
1363 if (!tb_init) {
1364 tb_init = 1;
1365 item_len = ih_item_len(PATH_PITEM_HEAD(&path));
1366 init_tb_struct(th, &tb, th->t_super, &path,
1367 -(IH_SIZE + item_len));
1368 }
1369 quota_cut_bytes = ih_item_len(PATH_PITEM_HEAD(&path));
1370
1371 retval = fix_nodes(M_DELETE, &tb, NULL, NULL);
1372 if (retval == REPEAT_SEARCH) {
1373 PROC_INFO_INC(th->t_super, delete_solid_item_restarted);
1374 continue;
1375 }
1376
1377 if (retval == CARRY_ON) {
1378 do_balance(&tb, NULL, NULL, M_DELETE);
1379 if (inode) { /* Should we count quota for item? (we don't count quotas for save-links) */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380#ifdef REISERQUOTA_DEBUG
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001381 reiserfs_debug(th->t_super, REISERFS_DEBUG_CODE,
1382 "reiserquota delete_solid_item(): freeing %u id=%u type=%c",
1383 quota_cut_bytes, inode->i_uid,
1384 key2type(key));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001386 DQUOT_FREE_SPACE_NODIRTY(inode,
1387 quota_cut_bytes);
1388 }
1389 break;
1390 }
1391 // IO_ERROR, NO_DISK_SPACE, etc
1392 reiserfs_warning(th->t_super,
1393 "vs-5360: reiserfs_delete_solid_item: "
1394 "could not delete %K due to fix_nodes failure",
1395 &cpu_key);
1396 unfix_nodes(&tb);
1397 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 }
1399
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001400 reiserfs_check_path(&path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401}
1402
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001403int reiserfs_delete_object(struct reiserfs_transaction_handle *th,
1404 struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001406 int err;
1407 inode->i_size = 0;
1408 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001410 /* for directory this deletes item containing "." and ".." */
1411 err =
1412 reiserfs_do_truncate(th, inode, NULL, 0 /*no timestamp updates */ );
1413 if (err)
1414 return err;
1415
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416#if defined( USE_INODE_GENERATION_COUNTER )
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001417 if (!old_format_only(th->t_super)) {
1418 __le32 *inode_generation;
1419
1420 inode_generation =
1421 &REISERFS_SB(th->t_super)->s_rs->s_inode_generation;
Marcin Slusarz9e902df2008-04-28 02:16:20 -07001422 le32_add_cpu(inode_generation, 1);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001423 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424/* USE_INODE_GENERATION_COUNTER */
1425#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001426 reiserfs_delete_solid_item(th, inode, INODE_PKEY(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001428 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429}
1430
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001431static void unmap_buffers(struct page *page, loff_t pos)
1432{
1433 struct buffer_head *bh;
1434 struct buffer_head *head;
1435 struct buffer_head *next;
1436 unsigned long tail_index;
1437 unsigned long cur_index;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001439 if (page) {
1440 if (page_has_buffers(page)) {
1441 tail_index = pos & (PAGE_CACHE_SIZE - 1);
1442 cur_index = 0;
1443 head = page_buffers(page);
1444 bh = head;
1445 do {
1446 next = bh->b_this_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001448 /* we want to unmap the buffers that contain the tail, and
1449 ** all the buffers after it (since the tail must be at the
1450 ** end of the file). We don't want to unmap file data
1451 ** before the tail, since it might be dirty and waiting to
1452 ** reach disk
1453 */
1454 cur_index += bh->b_size;
1455 if (cur_index > tail_index) {
1456 reiserfs_unmap_buffer(bh);
1457 }
1458 bh = next;
1459 } while (bh != head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462}
1463
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001464static int maybe_indirect_to_direct(struct reiserfs_transaction_handle *th,
1465 struct inode *p_s_inode,
1466 struct page *page,
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001467 struct treepath *p_s_path,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001468 const struct cpu_key *p_s_item_key,
1469 loff_t n_new_file_size, char *p_c_mode)
1470{
1471 struct super_block *p_s_sb = p_s_inode->i_sb;
1472 int n_block_size = p_s_sb->s_blocksize;
1473 int cut_bytes;
1474 BUG_ON(!th->t_trans_id);
Eric Sesterhenn14a61442006-10-03 23:36:38 +02001475 BUG_ON(n_new_file_size != p_s_inode->i_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001477 /* the page being sent in could be NULL if there was an i/o error
1478 ** reading in the last block. The user will hit problems trying to
1479 ** read the file, but for now we just skip the indirect2direct
1480 */
1481 if (atomic_read(&p_s_inode->i_count) > 1 ||
1482 !tail_has_to_be_packed(p_s_inode) ||
1483 !page || (REISERFS_I(p_s_inode)->i_flags & i_nopack_mask)) {
1484 // leave tail in an unformatted node
1485 *p_c_mode = M_SKIP_BALANCING;
1486 cut_bytes =
1487 n_block_size - (n_new_file_size & (n_block_size - 1));
1488 pathrelse(p_s_path);
1489 return cut_bytes;
1490 }
1491 /* Permorm the conversion to a direct_item. */
1492 /*return indirect_to_direct (p_s_inode, p_s_path, p_s_item_key, n_new_file_size, p_c_mode); */
1493 return indirect2direct(th, p_s_inode, page, p_s_path, p_s_item_key,
1494 n_new_file_size, p_c_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495}
1496
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497/* we did indirect_to_direct conversion. And we have inserted direct
1498 item successesfully, but there were no disk space to cut unfm
1499 pointer being converted. Therefore we have to delete inserted
1500 direct item(s) */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001501static void indirect_to_direct_roll_back(struct reiserfs_transaction_handle *th,
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001502 struct inode *inode, struct treepath *path)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001504 struct cpu_key tail_key;
1505 int tail_len;
1506 int removed;
1507 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001509 make_cpu_key(&tail_key, inode, inode->i_size + 1, TYPE_DIRECT, 4); // !!!!
1510 tail_key.key_length = 4;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001512 tail_len =
1513 (cpu_key_k_offset(&tail_key) & (inode->i_sb->s_blocksize - 1)) - 1;
1514 while (tail_len) {
1515 /* look for the last byte of the tail */
1516 if (search_for_position_by_key(inode->i_sb, &tail_key, path) ==
1517 POSITION_NOT_FOUND)
1518 reiserfs_panic(inode->i_sb,
1519 "vs-5615: indirect_to_direct_roll_back: found invalid item");
1520 RFALSE(path->pos_in_item !=
1521 ih_item_len(PATH_PITEM_HEAD(path)) - 1,
1522 "vs-5616: appended bytes found");
1523 PATH_LAST_POSITION(path)--;
1524
1525 removed =
1526 reiserfs_delete_item(th, path, &tail_key, inode,
1527 NULL /*unbh not needed */ );
1528 RFALSE(removed <= 0
1529 || removed > tail_len,
1530 "vs-5617: there was tail %d bytes, removed item length %d bytes",
1531 tail_len, removed);
1532 tail_len -= removed;
1533 set_cpu_key_k_offset(&tail_key,
1534 cpu_key_k_offset(&tail_key) - removed);
1535 }
1536 reiserfs_warning(inode->i_sb,
1537 "indirect_to_direct_roll_back: indirect_to_direct conversion has been rolled back due to lack of disk space");
1538 //mark_file_without_tail (inode);
1539 mark_inode_dirty(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540}
1541
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542/* (Truncate or cut entry) or delete object item. Returns < 0 on failure */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001543int reiserfs_cut_from_item(struct reiserfs_transaction_handle *th,
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001544 struct treepath *p_s_path,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001545 struct cpu_key *p_s_item_key,
1546 struct inode *p_s_inode,
1547 struct page *page, loff_t n_new_file_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001549 struct super_block *p_s_sb = p_s_inode->i_sb;
1550 /* Every function which is going to call do_balance must first
1551 create a tree_balance structure. Then it must fill up this
1552 structure by using the init_tb_struct and fix_nodes functions.
1553 After that we can make tree balancing. */
1554 struct tree_balance s_cut_balance;
1555 struct item_head *p_le_ih;
1556 int n_cut_size = 0, /* Amount to be cut. */
1557 n_ret_value = CARRY_ON, n_removed = 0, /* Number of the removed unformatted nodes. */
1558 n_is_inode_locked = 0;
1559 char c_mode; /* Mode of the balance. */
1560 int retval2 = -1;
1561 int quota_cut_bytes;
1562 loff_t tail_pos = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001564 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001566 init_tb_struct(th, &s_cut_balance, p_s_inode->i_sb, p_s_path,
1567 n_cut_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001569 /* Repeat this loop until we either cut the item without needing
1570 to balance, or we fix_nodes without schedule occurring */
1571 while (1) {
1572 /* Determine the balance mode, position of the first byte to
1573 be cut, and size to be cut. In case of the indirect item
1574 free unformatted nodes which are pointed to by the cut
1575 pointers. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001577 c_mode =
1578 prepare_for_delete_or_cut(th, p_s_inode, p_s_path,
1579 p_s_item_key, &n_removed,
1580 &n_cut_size, n_new_file_size);
1581 if (c_mode == M_CONVERT) {
1582 /* convert last unformatted node to direct item or leave
1583 tail in the unformatted node */
1584 RFALSE(n_ret_value != CARRY_ON,
1585 "PAP-5570: can not convert twice");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001587 n_ret_value =
1588 maybe_indirect_to_direct(th, p_s_inode, page,
1589 p_s_path, p_s_item_key,
1590 n_new_file_size, &c_mode);
1591 if (c_mode == M_SKIP_BALANCING)
1592 /* tail has been left in the unformatted node */
1593 return n_ret_value;
1594
1595 n_is_inode_locked = 1;
1596
1597 /* removing of last unformatted node will change value we
1598 have to return to truncate. Save it */
1599 retval2 = n_ret_value;
1600 /*retval2 = p_s_sb->s_blocksize - (n_new_file_size & (p_s_sb->s_blocksize - 1)); */
1601
1602 /* So, we have performed the first part of the conversion:
1603 inserting the new direct item. Now we are removing the
1604 last unformatted node pointer. Set key to search for
1605 it. */
1606 set_cpu_key_k_type(p_s_item_key, TYPE_INDIRECT);
1607 p_s_item_key->key_length = 4;
1608 n_new_file_size -=
1609 (n_new_file_size & (p_s_sb->s_blocksize - 1));
1610 tail_pos = n_new_file_size;
1611 set_cpu_key_k_offset(p_s_item_key, n_new_file_size + 1);
1612 if (search_for_position_by_key
1613 (p_s_sb, p_s_item_key,
1614 p_s_path) == POSITION_NOT_FOUND) {
1615 print_block(PATH_PLAST_BUFFER(p_s_path), 3,
1616 PATH_LAST_POSITION(p_s_path) - 1,
1617 PATH_LAST_POSITION(p_s_path) + 1);
1618 reiserfs_panic(p_s_sb,
1619 "PAP-5580: reiserfs_cut_from_item: item to convert does not exist (%K)",
1620 p_s_item_key);
1621 }
1622 continue;
1623 }
1624 if (n_cut_size == 0) {
1625 pathrelse(p_s_path);
1626 return 0;
1627 }
1628
1629 s_cut_balance.insert_size[0] = n_cut_size;
1630
1631 n_ret_value = fix_nodes(c_mode, &s_cut_balance, NULL, NULL);
1632 if (n_ret_value != REPEAT_SEARCH)
1633 break;
1634
1635 PROC_INFO_INC(p_s_sb, cut_from_item_restarted);
1636
1637 n_ret_value =
1638 search_for_position_by_key(p_s_sb, p_s_item_key, p_s_path);
1639 if (n_ret_value == POSITION_FOUND)
1640 continue;
1641
1642 reiserfs_warning(p_s_sb,
1643 "PAP-5610: reiserfs_cut_from_item: item %K not found",
1644 p_s_item_key);
1645 unfix_nodes(&s_cut_balance);
1646 return (n_ret_value == IO_ERROR) ? -EIO : -ENOENT;
1647 } /* while */
1648
1649 // check fix_nodes results (IO_ERROR or NO_DISK_SPACE)
1650 if (n_ret_value != CARRY_ON) {
1651 if (n_is_inode_locked) {
1652 // FIXME: this seems to be not needed: we are always able
1653 // to cut item
1654 indirect_to_direct_roll_back(th, p_s_inode, p_s_path);
1655 }
1656 if (n_ret_value == NO_DISK_SPACE)
1657 reiserfs_warning(p_s_sb, "NO_DISK_SPACE");
1658 unfix_nodes(&s_cut_balance);
1659 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660 }
1661
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001662 /* go ahead and perform balancing */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001664 RFALSE(c_mode == M_PASTE || c_mode == M_INSERT, "invalid mode");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001665
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001666 /* Calculate number of bytes that need to be cut from the item. */
1667 quota_cut_bytes =
1668 (c_mode ==
1669 M_DELETE) ? ih_item_len(get_ih(p_s_path)) : -s_cut_balance.
1670 insert_size[0];
1671 if (retval2 == -1)
1672 n_ret_value = calc_deleted_bytes_number(&s_cut_balance, c_mode);
1673 else
1674 n_ret_value = retval2;
1675
1676 /* For direct items, we only change the quota when deleting the last
1677 ** item.
1678 */
1679 p_le_ih = PATH_PITEM_HEAD(s_cut_balance.tb_path);
1680 if (!S_ISLNK(p_s_inode->i_mode) && is_direct_le_ih(p_le_ih)) {
1681 if (c_mode == M_DELETE &&
1682 (le_ih_k_offset(p_le_ih) & (p_s_sb->s_blocksize - 1)) ==
1683 1) {
1684 // FIXME: this is to keep 3.5 happy
1685 REISERFS_I(p_s_inode)->i_first_direct_byte = U32_MAX;
1686 quota_cut_bytes = p_s_sb->s_blocksize + UNFM_P_SIZE;
1687 } else {
1688 quota_cut_bytes = 0;
1689 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691#ifdef CONFIG_REISERFS_CHECK
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001692 if (n_is_inode_locked) {
1693 struct item_head *le_ih =
1694 PATH_PITEM_HEAD(s_cut_balance.tb_path);
1695 /* we are going to complete indirect2direct conversion. Make
1696 sure, that we exactly remove last unformatted node pointer
1697 of the item */
1698 if (!is_indirect_le_ih(le_ih))
1699 reiserfs_panic(p_s_sb,
1700 "vs-5652: reiserfs_cut_from_item: "
1701 "item must be indirect %h", le_ih);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001702
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001703 if (c_mode == M_DELETE && ih_item_len(le_ih) != UNFM_P_SIZE)
1704 reiserfs_panic(p_s_sb,
1705 "vs-5653: reiserfs_cut_from_item: "
1706 "completing indirect2direct conversion indirect item %h "
1707 "being deleted must be of 4 byte long",
1708 le_ih);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001710 if (c_mode == M_CUT
1711 && s_cut_balance.insert_size[0] != -UNFM_P_SIZE) {
1712 reiserfs_panic(p_s_sb,
1713 "vs-5654: reiserfs_cut_from_item: "
1714 "can not complete indirect2direct conversion of %h (CUT, insert_size==%d)",
1715 le_ih, s_cut_balance.insert_size[0]);
1716 }
1717 /* it would be useful to make sure, that right neighboring
1718 item is direct item of this file */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001719 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001721
1722 do_balance(&s_cut_balance, NULL, NULL, c_mode);
1723 if (n_is_inode_locked) {
1724 /* we've done an indirect->direct conversion. when the data block
1725 ** was freed, it was removed from the list of blocks that must
1726 ** be flushed before the transaction commits, make sure to
1727 ** unmap and invalidate it
1728 */
1729 unmap_buffers(page, tail_pos);
1730 REISERFS_I(p_s_inode)->i_flags &= ~i_pack_on_close_mask;
1731 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732#ifdef REISERQUOTA_DEBUG
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001733 reiserfs_debug(p_s_inode->i_sb, REISERFS_DEBUG_CODE,
1734 "reiserquota cut_from_item(): freeing %u id=%u type=%c",
1735 quota_cut_bytes, p_s_inode->i_uid, '?');
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001737 DQUOT_FREE_SPACE_NODIRTY(p_s_inode, quota_cut_bytes);
1738 return n_ret_value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739}
1740
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001741static void truncate_directory(struct reiserfs_transaction_handle *th,
1742 struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001744 BUG_ON(!th->t_trans_id);
1745 if (inode->i_nlink)
1746 reiserfs_warning(inode->i_sb,
1747 "vs-5655: truncate_directory: link count != 0");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001749 set_le_key_k_offset(KEY_FORMAT_3_5, INODE_PKEY(inode), DOT_OFFSET);
1750 set_le_key_k_type(KEY_FORMAT_3_5, INODE_PKEY(inode), TYPE_DIRENTRY);
1751 reiserfs_delete_solid_item(th, inode, INODE_PKEY(inode));
1752 reiserfs_update_sd(th, inode);
1753 set_le_key_k_offset(KEY_FORMAT_3_5, INODE_PKEY(inode), SD_OFFSET);
1754 set_le_key_k_type(KEY_FORMAT_3_5, INODE_PKEY(inode), TYPE_STAT_DATA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001755}
1756
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757/* Truncate file to the new size. Note, this must be called with a transaction
1758 already started */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001759int reiserfs_do_truncate(struct reiserfs_transaction_handle *th, struct inode *p_s_inode, /* ->i_size contains new
1760 size */
1761 struct page *page, /* up to date for last block */
1762 int update_timestamps /* when it is called by
1763 file_release to convert
1764 the tail - no timestamps
1765 should be updated */
1766 )
1767{
1768 INITIALIZE_PATH(s_search_path); /* Path to the current object item. */
1769 struct item_head *p_le_ih; /* Pointer to an item header. */
1770 struct cpu_key s_item_key; /* Key to search for a previous file item. */
1771 loff_t n_file_size, /* Old file size. */
1772 n_new_file_size; /* New file size. */
1773 int n_deleted; /* Number of deleted or truncated bytes. */
1774 int retval;
1775 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001776
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001777 BUG_ON(!th->t_trans_id);
1778 if (!
1779 (S_ISREG(p_s_inode->i_mode) || S_ISDIR(p_s_inode->i_mode)
1780 || S_ISLNK(p_s_inode->i_mode)))
1781 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001782
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001783 if (S_ISDIR(p_s_inode->i_mode)) {
1784 // deletion of directory - no need to update timestamps
1785 truncate_directory(th, p_s_inode);
1786 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001787 }
1788
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001789 /* Get new file size. */
1790 n_new_file_size = p_s_inode->i_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001791
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001792 // FIXME: note, that key type is unimportant here
1793 make_cpu_key(&s_item_key, p_s_inode, max_reiserfs_offset(p_s_inode),
1794 TYPE_DIRECT, 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001795
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001796 retval =
1797 search_for_position_by_key(p_s_inode->i_sb, &s_item_key,
1798 &s_search_path);
1799 if (retval == IO_ERROR) {
1800 reiserfs_warning(p_s_inode->i_sb,
1801 "vs-5657: reiserfs_do_truncate: "
1802 "i/o failure occurred trying to truncate %K",
1803 &s_item_key);
1804 err = -EIO;
1805 goto out;
1806 }
1807 if (retval == POSITION_FOUND || retval == FILE_NOT_FOUND) {
1808 reiserfs_warning(p_s_inode->i_sb,
1809 "PAP-5660: reiserfs_do_truncate: "
1810 "wrong result %d of search for %K", retval,
1811 &s_item_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001812
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001813 err = -EIO;
1814 goto out;
1815 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001816
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001817 s_search_path.pos_in_item--;
1818
1819 /* Get real file size (total length of all file items) */
1820 p_le_ih = PATH_PITEM_HEAD(&s_search_path);
1821 if (is_statdata_le_ih(p_le_ih))
1822 n_file_size = 0;
1823 else {
1824 loff_t offset = le_ih_k_offset(p_le_ih);
1825 int bytes =
1826 op_bytes_number(p_le_ih, p_s_inode->i_sb->s_blocksize);
1827
1828 /* this may mismatch with real file size: if last direct item
1829 had no padding zeros and last unformatted node had no free
1830 space, this file would have this file size */
1831 n_file_size = offset + bytes - 1;
1832 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 /*
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001834 * are we doing a full truncate or delete, if so
1835 * kick in the reada code
1836 */
1837 if (n_new_file_size == 0)
1838 s_search_path.reada = PATH_READA | PATH_READA_BACK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001840 if (n_file_size == 0 || n_file_size < n_new_file_size) {
1841 goto update_and_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001844 /* Update key to search for the last file item. */
1845 set_cpu_key_k_offset(&s_item_key, n_file_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001847 do {
1848 /* Cut or delete file item. */
1849 n_deleted =
1850 reiserfs_cut_from_item(th, &s_search_path, &s_item_key,
1851 p_s_inode, page, n_new_file_size);
1852 if (n_deleted < 0) {
1853 reiserfs_warning(p_s_inode->i_sb,
1854 "vs-5665: reiserfs_do_truncate: reiserfs_cut_from_item failed");
1855 reiserfs_check_path(&s_search_path);
1856 return 0;
1857 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001858
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001859 RFALSE(n_deleted > n_file_size,
1860 "PAP-5670: reiserfs_cut_from_item: too many bytes deleted: deleted %d, file_size %lu, item_key %K",
1861 n_deleted, n_file_size, &s_item_key);
1862
1863 /* Change key to search the last file item. */
1864 n_file_size -= n_deleted;
1865
1866 set_cpu_key_k_offset(&s_item_key, n_file_size);
1867
1868 /* While there are bytes to truncate and previous file item is presented in the tree. */
1869
1870 /*
1871 ** This loop could take a really long time, and could log
1872 ** many more blocks than a transaction can hold. So, we do a polite
1873 ** journal end here, and if the transaction needs ending, we make
1874 ** sure the file is consistent before ending the current trans
1875 ** and starting a new one
1876 */
Alexander Zarochentzev23f9e0f2006-03-25 03:06:57 -08001877 if (journal_transaction_should_end(th, 0) ||
1878 reiserfs_transaction_free_space(th) <= JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001879 int orig_len_alloc = th->t_blocks_allocated;
1880 decrement_counters_in_path(&s_search_path);
1881
1882 if (update_timestamps) {
1883 p_s_inode->i_mtime = p_s_inode->i_ctime =
1884 CURRENT_TIME_SEC;
1885 }
1886 reiserfs_update_sd(th, p_s_inode);
1887
1888 err = journal_end(th, p_s_inode->i_sb, orig_len_alloc);
1889 if (err)
1890 goto out;
1891 err = journal_begin(th, p_s_inode->i_sb,
Alexander Zarochentzev23f9e0f2006-03-25 03:06:57 -08001892 JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD + JOURNAL_PER_BALANCE_CNT * 4) ;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001893 if (err)
1894 goto out;
1895 reiserfs_update_inode_transaction(p_s_inode);
1896 }
1897 } while (n_file_size > ROUND_UP(n_new_file_size) &&
1898 search_for_position_by_key(p_s_inode->i_sb, &s_item_key,
1899 &s_search_path) == POSITION_FOUND);
1900
1901 RFALSE(n_file_size > ROUND_UP(n_new_file_size),
1902 "PAP-5680: truncate did not finish: new_file_size %Ld, current %Ld, oid %d",
1903 n_new_file_size, n_file_size, s_item_key.on_disk_key.k_objectid);
1904
1905 update_and_out:
1906 if (update_timestamps) {
1907 // this is truncate, not file closing
1908 p_s_inode->i_mtime = p_s_inode->i_ctime = CURRENT_TIME_SEC;
1909 }
1910 reiserfs_update_sd(th, p_s_inode);
1911
1912 out:
1913 pathrelse(&s_search_path);
1914 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915}
1916
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917#ifdef CONFIG_REISERFS_CHECK
1918// this makes sure, that we __append__, not overwrite or add holes
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001919static void check_research_for_paste(struct treepath *path,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001920 const struct cpu_key *p_s_key)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001922 struct item_head *found_ih = get_ih(path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001924 if (is_direct_le_ih(found_ih)) {
1925 if (le_ih_k_offset(found_ih) +
1926 op_bytes_number(found_ih,
1927 get_last_bh(path)->b_size) !=
1928 cpu_key_k_offset(p_s_key)
1929 || op_bytes_number(found_ih,
1930 get_last_bh(path)->b_size) !=
1931 pos_in_item(path))
1932 reiserfs_panic(NULL,
1933 "PAP-5720: check_research_for_paste: "
1934 "found direct item %h or position (%d) does not match to key %K",
1935 found_ih, pos_in_item(path), p_s_key);
1936 }
1937 if (is_indirect_le_ih(found_ih)) {
1938 if (le_ih_k_offset(found_ih) +
1939 op_bytes_number(found_ih,
1940 get_last_bh(path)->b_size) !=
1941 cpu_key_k_offset(p_s_key)
1942 || I_UNFM_NUM(found_ih) != pos_in_item(path)
1943 || get_ih_free_space(found_ih) != 0)
1944 reiserfs_panic(NULL,
1945 "PAP-5730: check_research_for_paste: "
1946 "found indirect item (%h) or position (%d) does not match to key (%K)",
1947 found_ih, pos_in_item(path), p_s_key);
1948 }
1949}
1950#endif /* config reiserfs check */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951
1952/* Paste bytes to the existing item. Returns bytes number pasted into the item. */
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001953int reiserfs_paste_into_item(struct reiserfs_transaction_handle *th, struct treepath *p_s_search_path, /* Path to the pasted item. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001954 const struct cpu_key *p_s_key, /* Key to search for the needed item. */
1955 struct inode *inode, /* Inode item belongs to */
1956 const char *p_c_body, /* Pointer to the bytes to paste. */
1957 int n_pasted_size)
1958{ /* Size of pasted bytes. */
1959 struct tree_balance s_paste_balance;
1960 int retval;
1961 int fs_gen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001963 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001964
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001965 fs_gen = get_generation(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001966
1967#ifdef REISERQUOTA_DEBUG
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001968 reiserfs_debug(inode->i_sb, REISERFS_DEBUG_CODE,
1969 "reiserquota paste_into_item(): allocating %u id=%u type=%c",
1970 n_pasted_size, inode->i_uid,
1971 key2type(&(p_s_key->on_disk_key)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972#endif
1973
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001974 if (DQUOT_ALLOC_SPACE_NODIRTY(inode, n_pasted_size)) {
1975 pathrelse(p_s_search_path);
1976 return -EDQUOT;
1977 }
1978 init_tb_struct(th, &s_paste_balance, th->t_super, p_s_search_path,
1979 n_pasted_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001980#ifdef DISPLACE_NEW_PACKING_LOCALITIES
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001981 s_paste_balance.key = p_s_key->on_disk_key;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982#endif
1983
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001984 /* DQUOT_* can schedule, must check before the fix_nodes */
1985 if (fs_changed(fs_gen, inode->i_sb)) {
1986 goto search_again;
1987 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001988
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001989 while ((retval =
1990 fix_nodes(M_PASTE, &s_paste_balance, NULL,
1991 p_c_body)) == REPEAT_SEARCH) {
1992 search_again:
1993 /* file system changed while we were in the fix_nodes */
1994 PROC_INFO_INC(th->t_super, paste_into_item_restarted);
1995 retval =
1996 search_for_position_by_key(th->t_super, p_s_key,
1997 p_s_search_path);
1998 if (retval == IO_ERROR) {
1999 retval = -EIO;
2000 goto error_out;
2001 }
2002 if (retval == POSITION_FOUND) {
2003 reiserfs_warning(inode->i_sb,
2004 "PAP-5710: reiserfs_paste_into_item: entry or pasted byte (%K) exists",
2005 p_s_key);
2006 retval = -EEXIST;
2007 goto error_out;
2008 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002009#ifdef CONFIG_REISERFS_CHECK
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002010 check_research_for_paste(p_s_search_path, p_s_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002011#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002012 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002013
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002014 /* Perform balancing after all resources are collected by fix_nodes, and
2015 accessing them will not risk triggering schedule. */
2016 if (retval == CARRY_ON) {
2017 do_balance(&s_paste_balance, NULL /*ih */ , p_c_body, M_PASTE);
2018 return 0;
2019 }
2020 retval = (retval == NO_DISK_SPACE) ? -ENOSPC : -EIO;
2021 error_out:
2022 /* this also releases the path */
2023 unfix_nodes(&s_paste_balance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002024#ifdef REISERQUOTA_DEBUG
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002025 reiserfs_debug(inode->i_sb, REISERFS_DEBUG_CODE,
2026 "reiserquota paste_into_item(): freeing %u id=%u type=%c",
2027 n_pasted_size, inode->i_uid,
2028 key2type(&(p_s_key->on_disk_key)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002029#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002030 DQUOT_FREE_SPACE_NODIRTY(inode, n_pasted_size);
2031 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002032}
2033
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034/* Insert new item into the buffer at the path. */
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08002035int reiserfs_insert_item(struct reiserfs_transaction_handle *th, struct treepath *p_s_path, /* Path to the inserteded item. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002036 const struct cpu_key *key, struct item_head *p_s_ih, /* Pointer to the item header to insert. */
2037 struct inode *inode, const char *p_c_body)
2038{ /* Pointer to the bytes to insert. */
2039 struct tree_balance s_ins_balance;
2040 int retval;
2041 int fs_gen = 0;
2042 int quota_bytes = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002043
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002044 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002045
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002046 if (inode) { /* Do we count quotas for item? */
2047 fs_gen = get_generation(inode->i_sb);
2048 quota_bytes = ih_item_len(p_s_ih);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002049
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002050 /* hack so the quota code doesn't have to guess if the file has
2051 ** a tail, links are always tails, so there's no guessing needed
2052 */
2053 if (!S_ISLNK(inode->i_mode) && is_direct_le_ih(p_s_ih)) {
2054 quota_bytes = inode->i_sb->s_blocksize + UNFM_P_SIZE;
2055 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056#ifdef REISERQUOTA_DEBUG
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002057 reiserfs_debug(inode->i_sb, REISERFS_DEBUG_CODE,
2058 "reiserquota insert_item(): allocating %u id=%u type=%c",
2059 quota_bytes, inode->i_uid, head2type(p_s_ih));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002060#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002061 /* We can't dirty inode here. It would be immediately written but
2062 * appropriate stat item isn't inserted yet... */
2063 if (DQUOT_ALLOC_SPACE_NODIRTY(inode, quota_bytes)) {
2064 pathrelse(p_s_path);
2065 return -EDQUOT;
2066 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002068 init_tb_struct(th, &s_ins_balance, th->t_super, p_s_path,
2069 IH_SIZE + ih_item_len(p_s_ih));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070#ifdef DISPLACE_NEW_PACKING_LOCALITIES
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002071 s_ins_balance.key = key->on_disk_key;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002072#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002073 /* DQUOT_* can schedule, must check to be sure calling fix_nodes is safe */
2074 if (inode && fs_changed(fs_gen, inode->i_sb)) {
2075 goto search_again;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002076 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002077
2078 while ((retval =
2079 fix_nodes(M_INSERT, &s_ins_balance, p_s_ih,
2080 p_c_body)) == REPEAT_SEARCH) {
2081 search_again:
2082 /* file system changed while we were in the fix_nodes */
2083 PROC_INFO_INC(th->t_super, insert_item_restarted);
2084 retval = search_item(th->t_super, key, p_s_path);
2085 if (retval == IO_ERROR) {
2086 retval = -EIO;
2087 goto error_out;
2088 }
2089 if (retval == ITEM_FOUND) {
2090 reiserfs_warning(th->t_super,
2091 "PAP-5760: reiserfs_insert_item: "
2092 "key %K already exists in the tree",
2093 key);
2094 retval = -EEXIST;
2095 goto error_out;
2096 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002097 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002098
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002099 /* make balancing after all resources will be collected at a time */
2100 if (retval == CARRY_ON) {
2101 do_balance(&s_ins_balance, p_s_ih, p_c_body, M_INSERT);
2102 return 0;
2103 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002104
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002105 retval = (retval == NO_DISK_SPACE) ? -ENOSPC : -EIO;
2106 error_out:
2107 /* also releases the path */
2108 unfix_nodes(&s_ins_balance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002109#ifdef REISERQUOTA_DEBUG
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002110 reiserfs_debug(th->t_super, REISERFS_DEBUG_CODE,
2111 "reiserquota insert_item(): freeing %u id=%u type=%c",
2112 quota_bytes, inode->i_uid, head2type(p_s_ih));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002113#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002114 if (inode)
2115 DQUOT_FREE_SPACE_NODIRTY(inode, quota_bytes);
2116 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002117}