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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README | |
3 | */ | |
4 | ||
1da177e4 LT |
5 | #include <linux/time.h> |
6 | #include <linux/fs.h> | |
7 | #include <linux/reiserfs_fs.h> | |
8 | #include <linux/reiserfs_acl.h> | |
9 | #include <linux/reiserfs_xattr.h> | |
a5694255 | 10 | #include <linux/exportfs.h> |
1da177e4 LT |
11 | #include <linux/smp_lock.h> |
12 | #include <linux/pagemap.h> | |
13 | #include <linux/highmem.h> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
1da177e4 LT |
15 | #include <asm/uaccess.h> |
16 | #include <asm/unaligned.h> | |
17 | #include <linux/buffer_head.h> | |
18 | #include <linux/mpage.h> | |
19 | #include <linux/writeback.h> | |
20 | #include <linux/quotaops.h> | |
ba9d8cec | 21 | #include <linux/swap.h> |
1da177e4 | 22 | |
ba9d8cec VS |
23 | int reiserfs_commit_write(struct file *f, struct page *page, |
24 | unsigned from, unsigned to); | |
25 | int reiserfs_prepare_write(struct file *f, struct page *page, | |
26 | unsigned from, unsigned to); | |
1da177e4 | 27 | |
845a2cc0 | 28 | void reiserfs_evict_inode(struct inode *inode) |
1da177e4 | 29 | { |
bd4c625c LT |
30 | /* We need blocks for transaction + (user+group) quota update (possibly delete) */ |
31 | int jbegin_count = | |
32 | JOURNAL_PER_BALANCE_CNT * 2 + | |
33 | 2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb); | |
34 | struct reiserfs_transaction_handle th; | |
cb1c2e51 | 35 | int depth; |
24996049 | 36 | int err; |
1da177e4 | 37 | |
845a2cc0 | 38 | if (!inode->i_nlink && !is_bad_inode(inode)) |
871a2931 | 39 | dquot_initialize(inode); |
907f4554 | 40 | |
fef26658 | 41 | truncate_inode_pages(&inode->i_data, 0); |
845a2cc0 AV |
42 | if (inode->i_nlink) |
43 | goto no_delete; | |
fef26658 | 44 | |
cb1c2e51 | 45 | depth = reiserfs_write_lock_once(inode->i_sb); |
1da177e4 | 46 | |
bd4c625c LT |
47 | /* The = 0 happens when we abort creating a new inode for some reason like lack of space.. */ |
48 | if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) { /* also handles bad_inode case */ | |
bd4c625c | 49 | reiserfs_delete_xattrs(inode); |
1da177e4 | 50 | |
b0b33dee | 51 | if (journal_begin(&th, inode->i_sb, jbegin_count)) |
bd4c625c | 52 | goto out; |
bd4c625c | 53 | reiserfs_update_inode_transaction(inode); |
1da177e4 | 54 | |
eb35c218 JM |
55 | reiserfs_discard_prealloc(&th, inode); |
56 | ||
24996049 | 57 | err = reiserfs_delete_object(&th, inode); |
1da177e4 | 58 | |
bd4c625c LT |
59 | /* Do quota update inside a transaction for journaled quotas. We must do that |
60 | * after delete_object so that quota updates go into the same transaction as | |
61 | * stat data deletion */ | |
24996049 | 62 | if (!err) |
63936dda | 63 | dquot_free_inode(inode); |
bd4c625c | 64 | |
b0b33dee | 65 | if (journal_end(&th, inode->i_sb, jbegin_count)) |
bd4c625c | 66 | goto out; |
1da177e4 | 67 | |
24996049 JM |
68 | /* check return value from reiserfs_delete_object after |
69 | * ending the transaction | |
70 | */ | |
71 | if (err) | |
72 | goto out; | |
73 | ||
bd4c625c LT |
74 | /* all items of file are deleted, so we can remove "save" link */ |
75 | remove_save_link(inode, 0 /* not truncate */ ); /* we can't do anything | |
76 | * about an error here */ | |
77 | } else { | |
78 | /* no object items are in the tree */ | |
79 | ; | |
80 | } | |
81 | out: | |
845a2cc0 AV |
82 | end_writeback(inode); /* note this must go after the journal_end to prevent deadlock */ |
83 | dquot_drop(inode); | |
bd4c625c | 84 | inode->i_blocks = 0; |
cb1c2e51 | 85 | reiserfs_write_unlock_once(inode->i_sb, depth); |
845a2cc0 AV |
86 | |
87 | no_delete: | |
88 | end_writeback(inode); | |
89 | dquot_drop(inode); | |
1da177e4 LT |
90 | } |
91 | ||
bd4c625c LT |
92 | static void _make_cpu_key(struct cpu_key *key, int version, __u32 dirid, |
93 | __u32 objectid, loff_t offset, int type, int length) | |
1da177e4 | 94 | { |
bd4c625c | 95 | key->version = version; |
1da177e4 | 96 | |
bd4c625c LT |
97 | key->on_disk_key.k_dir_id = dirid; |
98 | key->on_disk_key.k_objectid = objectid; | |
99 | set_cpu_key_k_offset(key, offset); | |
100 | set_cpu_key_k_type(key, type); | |
101 | key->key_length = length; | |
1da177e4 LT |
102 | } |
103 | ||
1da177e4 LT |
104 | /* take base of inode_key (it comes from inode always) (dirid, objectid) and version from an inode, set |
105 | offset and type of key */ | |
bd4c625c LT |
106 | void make_cpu_key(struct cpu_key *key, struct inode *inode, loff_t offset, |
107 | int type, int length) | |
1da177e4 | 108 | { |
bd4c625c LT |
109 | _make_cpu_key(key, get_inode_item_key_version(inode), |
110 | le32_to_cpu(INODE_PKEY(inode)->k_dir_id), | |
111 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), offset, type, | |
112 | length); | |
1da177e4 LT |
113 | } |
114 | ||
1da177e4 LT |
115 | // |
116 | // when key is 0, do not set version and short key | |
117 | // | |
bd4c625c LT |
118 | inline void make_le_item_head(struct item_head *ih, const struct cpu_key *key, |
119 | int version, | |
120 | loff_t offset, int type, int length, | |
121 | int entry_count /*or ih_free_space */ ) | |
1da177e4 | 122 | { |
bd4c625c LT |
123 | if (key) { |
124 | ih->ih_key.k_dir_id = cpu_to_le32(key->on_disk_key.k_dir_id); | |
125 | ih->ih_key.k_objectid = | |
126 | cpu_to_le32(key->on_disk_key.k_objectid); | |
127 | } | |
128 | put_ih_version(ih, version); | |
129 | set_le_ih_k_offset(ih, offset); | |
130 | set_le_ih_k_type(ih, type); | |
131 | put_ih_item_len(ih, length); | |
132 | /* set_ih_free_space (ih, 0); */ | |
133 | // for directory items it is entry count, for directs and stat | |
134 | // datas - 0xffff, for indirects - 0 | |
135 | put_ih_entry_count(ih, entry_count); | |
1da177e4 LT |
136 | } |
137 | ||
138 | // | |
139 | // FIXME: we might cache recently accessed indirect item | |
140 | ||
141 | // Ugh. Not too eager for that.... | |
142 | // I cut the code until such time as I see a convincing argument (benchmark). | |
143 | // I don't want a bloated inode struct..., and I don't like code complexity.... | |
144 | ||
145 | /* cutting the code is fine, since it really isn't in use yet and is easy | |
146 | ** to add back in. But, Vladimir has a really good idea here. Think | |
147 | ** about what happens for reading a file. For each page, | |
148 | ** The VFS layer calls reiserfs_readpage, who searches the tree to find | |
149 | ** an indirect item. This indirect item has X number of pointers, where | |
150 | ** X is a big number if we've done the block allocation right. But, | |
151 | ** we only use one or two of these pointers during each call to readpage, | |
152 | ** needlessly researching again later on. | |
153 | ** | |
154 | ** The size of the cache could be dynamic based on the size of the file. | |
155 | ** | |
156 | ** I'd also like to see us cache the location the stat data item, since | |
157 | ** we are needlessly researching for that frequently. | |
158 | ** | |
159 | ** --chris | |
160 | */ | |
161 | ||
162 | /* If this page has a file tail in it, and | |
163 | ** it was read in by get_block_create_0, the page data is valid, | |
164 | ** but tail is still sitting in a direct item, and we can't write to | |
165 | ** it. So, look through this page, and check all the mapped buffers | |
166 | ** to make sure they have valid block numbers. Any that don't need | |
167 | ** to be unmapped, so that block_prepare_write will correctly call | |
168 | ** reiserfs_get_block to convert the tail into an unformatted node | |
169 | */ | |
bd4c625c LT |
170 | static inline void fix_tail_page_for_writing(struct page *page) |
171 | { | |
172 | struct buffer_head *head, *next, *bh; | |
173 | ||
174 | if (page && page_has_buffers(page)) { | |
175 | head = page_buffers(page); | |
176 | bh = head; | |
177 | do { | |
178 | next = bh->b_this_page; | |
179 | if (buffer_mapped(bh) && bh->b_blocknr == 0) { | |
180 | reiserfs_unmap_buffer(bh); | |
181 | } | |
182 | bh = next; | |
183 | } while (bh != head); | |
184 | } | |
1da177e4 LT |
185 | } |
186 | ||
187 | /* reiserfs_get_block does not need to allocate a block only if it has been | |
188 | done already or non-hole position has been found in the indirect item */ | |
bd4c625c LT |
189 | static inline int allocation_needed(int retval, b_blocknr_t allocated, |
190 | struct item_head *ih, | |
191 | __le32 * item, int pos_in_item) | |
1da177e4 | 192 | { |
bd4c625c LT |
193 | if (allocated) |
194 | return 0; | |
195 | if (retval == POSITION_FOUND && is_indirect_le_ih(ih) && | |
196 | get_block_num(item, pos_in_item)) | |
197 | return 0; | |
198 | return 1; | |
1da177e4 LT |
199 | } |
200 | ||
bd4c625c | 201 | static inline int indirect_item_found(int retval, struct item_head *ih) |
1da177e4 | 202 | { |
bd4c625c | 203 | return (retval == POSITION_FOUND) && is_indirect_le_ih(ih); |
1da177e4 LT |
204 | } |
205 | ||
bd4c625c LT |
206 | static inline void set_block_dev_mapped(struct buffer_head *bh, |
207 | b_blocknr_t block, struct inode *inode) | |
1da177e4 LT |
208 | { |
209 | map_bh(bh, inode->i_sb, block); | |
210 | } | |
211 | ||
1da177e4 LT |
212 | // |
213 | // files which were created in the earlier version can not be longer, | |
214 | // than 2 gb | |
215 | // | |
3ee16670 | 216 | static int file_capable(struct inode *inode, sector_t block) |
1da177e4 | 217 | { |
bd4c625c LT |
218 | if (get_inode_item_key_version(inode) != KEY_FORMAT_3_5 || // it is new file. |
219 | block < (1 << (31 - inode->i_sb->s_blocksize_bits))) // old file, but 'block' is inside of 2gb | |
220 | return 1; | |
1da177e4 | 221 | |
bd4c625c | 222 | return 0; |
1da177e4 LT |
223 | } |
224 | ||
deba0f49 AB |
225 | static int restart_transaction(struct reiserfs_transaction_handle *th, |
226 | struct inode *inode, struct treepath *path) | |
bd4c625c LT |
227 | { |
228 | struct super_block *s = th->t_super; | |
229 | int len = th->t_blocks_allocated; | |
230 | int err; | |
231 | ||
232 | BUG_ON(!th->t_trans_id); | |
233 | BUG_ON(!th->t_refcount); | |
234 | ||
87b4126f S |
235 | pathrelse(path); |
236 | ||
bd4c625c LT |
237 | /* we cannot restart while nested */ |
238 | if (th->t_refcount > 1) { | |
239 | return 0; | |
240 | } | |
bd4c625c LT |
241 | reiserfs_update_sd(th, inode); |
242 | err = journal_end(th, s, len); | |
243 | if (!err) { | |
244 | err = journal_begin(th, s, JOURNAL_PER_BALANCE_CNT * 6); | |
245 | if (!err) | |
246 | reiserfs_update_inode_transaction(inode); | |
247 | } | |
248 | return err; | |
1da177e4 LT |
249 | } |
250 | ||
251 | // it is called by get_block when create == 0. Returns block number | |
252 | // for 'block'-th logical block of file. When it hits direct item it | |
253 | // returns 0 (being called from bmap) or read direct item into piece | |
254 | // of page (bh_result) | |
255 | ||
256 | // Please improve the english/clarity in the comment above, as it is | |
257 | // hard to understand. | |
258 | ||
3ee16670 | 259 | static int _get_block_create_0(struct inode *inode, sector_t block, |
bd4c625c | 260 | struct buffer_head *bh_result, int args) |
1da177e4 | 261 | { |
bd4c625c LT |
262 | INITIALIZE_PATH(path); |
263 | struct cpu_key key; | |
264 | struct buffer_head *bh; | |
265 | struct item_head *ih, tmp_ih; | |
3ee16670 | 266 | b_blocknr_t blocknr; |
bd4c625c LT |
267 | char *p = NULL; |
268 | int chars; | |
269 | int ret; | |
270 | int result; | |
271 | int done = 0; | |
272 | unsigned long offset; | |
273 | ||
274 | // prepare the key to look for the 'block'-th block of file | |
275 | make_cpu_key(&key, inode, | |
276 | (loff_t) block * inode->i_sb->s_blocksize + 1, TYPE_ANY, | |
277 | 3); | |
278 | ||
bd4c625c LT |
279 | result = search_for_position_by_key(inode->i_sb, &key, &path); |
280 | if (result != POSITION_FOUND) { | |
281 | pathrelse(&path); | |
282 | if (p) | |
283 | kunmap(bh_result->b_page); | |
284 | if (result == IO_ERROR) | |
285 | return -EIO; | |
286 | // We do not return -ENOENT if there is a hole but page is uptodate, because it means | |
287 | // That there is some MMAPED data associated with it that is yet to be written to disk. | |
288 | if ((args & GET_BLOCK_NO_HOLE) | |
289 | && !PageUptodate(bh_result->b_page)) { | |
290 | return -ENOENT; | |
291 | } | |
292 | return 0; | |
293 | } | |
294 | // | |
295 | bh = get_last_bh(&path); | |
296 | ih = get_ih(&path); | |
297 | if (is_indirect_le_ih(ih)) { | |
298 | __le32 *ind_item = (__le32 *) B_I_PITEM(bh, ih); | |
299 | ||
300 | /* FIXME: here we could cache indirect item or part of it in | |
301 | the inode to avoid search_by_key in case of subsequent | |
302 | access to file */ | |
303 | blocknr = get_block_num(ind_item, path.pos_in_item); | |
304 | ret = 0; | |
305 | if (blocknr) { | |
306 | map_bh(bh_result, inode->i_sb, blocknr); | |
307 | if (path.pos_in_item == | |
308 | ((ih_item_len(ih) / UNFM_P_SIZE) - 1)) { | |
309 | set_buffer_boundary(bh_result); | |
310 | } | |
311 | } else | |
312 | // We do not return -ENOENT if there is a hole but page is uptodate, because it means | |
313 | // That there is some MMAPED data associated with it that is yet to be written to disk. | |
314 | if ((args & GET_BLOCK_NO_HOLE) | |
315 | && !PageUptodate(bh_result->b_page)) { | |
316 | ret = -ENOENT; | |
317 | } | |
318 | ||
319 | pathrelse(&path); | |
320 | if (p) | |
321 | kunmap(bh_result->b_page); | |
322 | return ret; | |
323 | } | |
324 | // requested data are in direct item(s) | |
325 | if (!(args & GET_BLOCK_READ_DIRECT)) { | |
326 | // we are called by bmap. FIXME: we can not map block of file | |
327 | // when it is stored in direct item(s) | |
328 | pathrelse(&path); | |
329 | if (p) | |
330 | kunmap(bh_result->b_page); | |
331 | return -ENOENT; | |
332 | } | |
333 | ||
334 | /* if we've got a direct item, and the buffer or page was uptodate, | |
335 | ** we don't want to pull data off disk again. skip to the | |
336 | ** end, where we map the buffer and return | |
337 | */ | |
338 | if (buffer_uptodate(bh_result)) { | |
339 | goto finished; | |
340 | } else | |
341 | /* | |
342 | ** grab_tail_page can trigger calls to reiserfs_get_block on up to date | |
343 | ** pages without any buffers. If the page is up to date, we don't want | |
344 | ** read old data off disk. Set the up to date bit on the buffer instead | |
345 | ** and jump to the end | |
346 | */ | |
347 | if (!bh_result->b_page || PageUptodate(bh_result->b_page)) { | |
1da177e4 | 348 | set_buffer_uptodate(bh_result); |
bd4c625c LT |
349 | goto finished; |
350 | } | |
351 | // read file tail into part of page | |
352 | offset = (cpu_key_k_offset(&key) - 1) & (PAGE_CACHE_SIZE - 1); | |
bd4c625c LT |
353 | copy_item_head(&tmp_ih, ih); |
354 | ||
355 | /* we only want to kmap if we are reading the tail into the page. | |
356 | ** this is not the common case, so we don't kmap until we are | |
357 | ** sure we need to. But, this means the item might move if | |
358 | ** kmap schedules | |
359 | */ | |
27b3a5c5 | 360 | if (!p) |
bd4c625c | 361 | p = (char *)kmap(bh_result->b_page); |
27b3a5c5 | 362 | |
bd4c625c LT |
363 | p += offset; |
364 | memset(p, 0, inode->i_sb->s_blocksize); | |
365 | do { | |
366 | if (!is_direct_le_ih(ih)) { | |
367 | BUG(); | |
368 | } | |
369 | /* make sure we don't read more bytes than actually exist in | |
370 | ** the file. This can happen in odd cases where i_size isn't | |
0222e657 | 371 | ** correct, and when direct item padding results in a few |
bd4c625c LT |
372 | ** extra bytes at the end of the direct item |
373 | */ | |
374 | if ((le_ih_k_offset(ih) + path.pos_in_item) > inode->i_size) | |
375 | break; | |
376 | if ((le_ih_k_offset(ih) - 1 + ih_item_len(ih)) > inode->i_size) { | |
377 | chars = | |
378 | inode->i_size - (le_ih_k_offset(ih) - 1) - | |
379 | path.pos_in_item; | |
380 | done = 1; | |
381 | } else { | |
382 | chars = ih_item_len(ih) - path.pos_in_item; | |
383 | } | |
384 | memcpy(p, B_I_PITEM(bh, ih) + path.pos_in_item, chars); | |
385 | ||
386 | if (done) | |
387 | break; | |
388 | ||
389 | p += chars; | |
390 | ||
391 | if (PATH_LAST_POSITION(&path) != (B_NR_ITEMS(bh) - 1)) | |
392 | // we done, if read direct item is not the last item of | |
393 | // node FIXME: we could try to check right delimiting key | |
394 | // to see whether direct item continues in the right | |
395 | // neighbor or rely on i_size | |
396 | break; | |
397 | ||
398 | // update key to look for the next piece | |
399 | set_cpu_key_k_offset(&key, cpu_key_k_offset(&key) + chars); | |
400 | result = search_for_position_by_key(inode->i_sb, &key, &path); | |
401 | if (result != POSITION_FOUND) | |
402 | // i/o error most likely | |
403 | break; | |
404 | bh = get_last_bh(&path); | |
405 | ih = get_ih(&path); | |
406 | } while (1); | |
407 | ||
408 | flush_dcache_page(bh_result->b_page); | |
409 | kunmap(bh_result->b_page); | |
410 | ||
411 | finished: | |
412 | pathrelse(&path); | |
413 | ||
414 | if (result == IO_ERROR) | |
415 | return -EIO; | |
1da177e4 | 416 | |
bd4c625c LT |
417 | /* this buffer has valid data, but isn't valid for io. mapping it to |
418 | * block #0 tells the rest of reiserfs it just has a tail in it | |
419 | */ | |
420 | map_bh(bh_result, inode->i_sb, 0); | |
421 | set_buffer_uptodate(bh_result); | |
422 | return 0; | |
423 | } | |
1da177e4 LT |
424 | |
425 | // this is called to create file map. So, _get_block_create_0 will not | |
426 | // read direct item | |
bd4c625c LT |
427 | static int reiserfs_bmap(struct inode *inode, sector_t block, |
428 | struct buffer_head *bh_result, int create) | |
1da177e4 | 429 | { |
bd4c625c LT |
430 | if (!file_capable(inode, block)) |
431 | return -EFBIG; | |
432 | ||
433 | reiserfs_write_lock(inode->i_sb); | |
434 | /* do not read the direct item */ | |
435 | _get_block_create_0(inode, block, bh_result, 0); | |
436 | reiserfs_write_unlock(inode->i_sb); | |
437 | return 0; | |
1da177e4 LT |
438 | } |
439 | ||
440 | /* special version of get_block that is only used by grab_tail_page right | |
441 | ** now. It is sent to block_prepare_write, and when you try to get a | |
442 | ** block past the end of the file (or a block from a hole) it returns | |
443 | ** -ENOENT instead of a valid buffer. block_prepare_write expects to | |
444 | ** be able to do i/o on the buffers returned, unless an error value | |
445 | ** is also returned. | |
0222e657 | 446 | ** |
1da177e4 LT |
447 | ** So, this allows block_prepare_write to be used for reading a single block |
448 | ** in a page. Where it does not produce a valid page for holes, or past the | |
449 | ** end of the file. This turns out to be exactly what we need for reading | |
450 | ** tails for conversion. | |
451 | ** | |
452 | ** The point of the wrapper is forcing a certain value for create, even | |
0222e657 JM |
453 | ** though the VFS layer is calling this function with create==1. If you |
454 | ** don't want to send create == GET_BLOCK_NO_HOLE to reiserfs_get_block, | |
1da177e4 LT |
455 | ** don't use this function. |
456 | */ | |
bd4c625c LT |
457 | static int reiserfs_get_block_create_0(struct inode *inode, sector_t block, |
458 | struct buffer_head *bh_result, | |
459 | int create) | |
460 | { | |
461 | return reiserfs_get_block(inode, block, bh_result, GET_BLOCK_NO_HOLE); | |
1da177e4 LT |
462 | } |
463 | ||
464 | /* This is special helper for reiserfs_get_block in case we are executing | |
465 | direct_IO request. */ | |
466 | static int reiserfs_get_blocks_direct_io(struct inode *inode, | |
467 | sector_t iblock, | |
1da177e4 LT |
468 | struct buffer_head *bh_result, |
469 | int create) | |
470 | { | |
bd4c625c LT |
471 | int ret; |
472 | ||
473 | bh_result->b_page = NULL; | |
1da177e4 | 474 | |
bd4c625c LT |
475 | /* We set the b_size before reiserfs_get_block call since it is |
476 | referenced in convert_tail_for_hole() that may be called from | |
477 | reiserfs_get_block() */ | |
478 | bh_result->b_size = (1 << inode->i_blkbits); | |
479 | ||
480 | ret = reiserfs_get_block(inode, iblock, bh_result, | |
481 | create | GET_BLOCK_NO_DANGLE); | |
482 | if (ret) | |
483 | goto out; | |
484 | ||
485 | /* don't allow direct io onto tail pages */ | |
486 | if (buffer_mapped(bh_result) && bh_result->b_blocknr == 0) { | |
487 | /* make sure future calls to the direct io funcs for this offset | |
488 | ** in the file fail by unmapping the buffer | |
489 | */ | |
490 | clear_buffer_mapped(bh_result); | |
491 | ret = -EINVAL; | |
492 | } | |
493 | /* Possible unpacked tail. Flush the data before pages have | |
494 | disappeared */ | |
495 | if (REISERFS_I(inode)->i_flags & i_pack_on_close_mask) { | |
496 | int err; | |
8ebc4232 FW |
497 | |
498 | reiserfs_write_lock(inode->i_sb); | |
499 | ||
bd4c625c LT |
500 | err = reiserfs_commit_for_inode(inode); |
501 | REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask; | |
8ebc4232 FW |
502 | |
503 | reiserfs_write_unlock(inode->i_sb); | |
504 | ||
bd4c625c LT |
505 | if (err < 0) |
506 | ret = err; | |
507 | } | |
508 | out: | |
509 | return ret; | |
510 | } | |
1da177e4 LT |
511 | |
512 | /* | |
513 | ** helper function for when reiserfs_get_block is called for a hole | |
514 | ** but the file tail is still in a direct item | |
515 | ** bh_result is the buffer head for the hole | |
516 | ** tail_offset is the offset of the start of the tail in the file | |
517 | ** | |
518 | ** This calls prepare_write, which will start a new transaction | |
519 | ** you should not be in a transaction, or have any paths held when you | |
520 | ** call this. | |
521 | */ | |
bd4c625c LT |
522 | static int convert_tail_for_hole(struct inode *inode, |
523 | struct buffer_head *bh_result, | |
524 | loff_t tail_offset) | |
525 | { | |
526 | unsigned long index; | |
527 | unsigned long tail_end; | |
528 | unsigned long tail_start; | |
529 | struct page *tail_page; | |
530 | struct page *hole_page = bh_result->b_page; | |
531 | int retval = 0; | |
532 | ||
533 | if ((tail_offset & (bh_result->b_size - 1)) != 1) | |
534 | return -EIO; | |
535 | ||
536 | /* always try to read until the end of the block */ | |
537 | tail_start = tail_offset & (PAGE_CACHE_SIZE - 1); | |
538 | tail_end = (tail_start | (bh_result->b_size - 1)) + 1; | |
539 | ||
540 | index = tail_offset >> PAGE_CACHE_SHIFT; | |
541 | /* hole_page can be zero in case of direct_io, we are sure | |
542 | that we cannot get here if we write with O_DIRECT into | |
543 | tail page */ | |
544 | if (!hole_page || index != hole_page->index) { | |
545 | tail_page = grab_cache_page(inode->i_mapping, index); | |
546 | retval = -ENOMEM; | |
547 | if (!tail_page) { | |
548 | goto out; | |
549 | } | |
550 | } else { | |
551 | tail_page = hole_page; | |
552 | } | |
553 | ||
554 | /* we don't have to make sure the conversion did not happen while | |
555 | ** we were locking the page because anyone that could convert | |
1b1dcc1b | 556 | ** must first take i_mutex. |
bd4c625c LT |
557 | ** |
558 | ** We must fix the tail page for writing because it might have buffers | |
559 | ** that are mapped, but have a block number of 0. This indicates tail | |
560 | ** data that has been read directly into the page, and block_prepare_write | |
561 | ** won't trigger a get_block in this case. | |
562 | */ | |
563 | fix_tail_page_for_writing(tail_page); | |
564 | retval = reiserfs_prepare_write(NULL, tail_page, tail_start, tail_end); | |
565 | if (retval) | |
566 | goto unlock; | |
567 | ||
568 | /* tail conversion might change the data in the page */ | |
569 | flush_dcache_page(tail_page); | |
570 | ||
571 | retval = reiserfs_commit_write(NULL, tail_page, tail_start, tail_end); | |
572 | ||
573 | unlock: | |
574 | if (tail_page != hole_page) { | |
575 | unlock_page(tail_page); | |
576 | page_cache_release(tail_page); | |
577 | } | |
578 | out: | |
579 | return retval; | |
1da177e4 LT |
580 | } |
581 | ||
582 | static inline int _allocate_block(struct reiserfs_transaction_handle *th, | |
3ee16670 | 583 | sector_t block, |
bd4c625c LT |
584 | struct inode *inode, |
585 | b_blocknr_t * allocated_block_nr, | |
fec6d055 | 586 | struct treepath *path, int flags) |
bd4c625c LT |
587 | { |
588 | BUG_ON(!th->t_trans_id); | |
589 | ||
1da177e4 | 590 | #ifdef REISERFS_PREALLOCATE |
1b1dcc1b | 591 | if (!(flags & GET_BLOCK_NO_IMUX)) { |
bd4c625c LT |
592 | return reiserfs_new_unf_blocknrs2(th, inode, allocated_block_nr, |
593 | path, block); | |
594 | } | |
1da177e4 | 595 | #endif |
bd4c625c LT |
596 | return reiserfs_new_unf_blocknrs(th, inode, allocated_block_nr, path, |
597 | block); | |
1da177e4 LT |
598 | } |
599 | ||
bd4c625c LT |
600 | int reiserfs_get_block(struct inode *inode, sector_t block, |
601 | struct buffer_head *bh_result, int create) | |
1da177e4 | 602 | { |
bd4c625c LT |
603 | int repeat, retval = 0; |
604 | b_blocknr_t allocated_block_nr = 0; // b_blocknr_t is (unsigned) 32 bit int | |
605 | INITIALIZE_PATH(path); | |
606 | int pos_in_item; | |
607 | struct cpu_key key; | |
608 | struct buffer_head *bh, *unbh = NULL; | |
609 | struct item_head *ih, tmp_ih; | |
610 | __le32 *item; | |
611 | int done; | |
612 | int fs_gen; | |
26931309 | 613 | int lock_depth; |
bd4c625c | 614 | struct reiserfs_transaction_handle *th = NULL; |
0222e657 | 615 | /* space reserved in transaction batch: |
bd4c625c LT |
616 | . 3 balancings in direct->indirect conversion |
617 | . 1 block involved into reiserfs_update_sd() | |
618 | XXX in practically impossible worst case direct2indirect() | |
619 | can incur (much) more than 3 balancings. | |
620 | quota update for user, group */ | |
621 | int jbegin_count = | |
622 | JOURNAL_PER_BALANCE_CNT * 3 + 1 + | |
623 | 2 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
624 | int version; | |
625 | int dangle = 1; | |
626 | loff_t new_offset = | |
627 | (((loff_t) block) << inode->i_sb->s_blocksize_bits) + 1; | |
628 | ||
26931309 | 629 | lock_depth = reiserfs_write_lock_once(inode->i_sb); |
bd4c625c | 630 | version = get_inode_item_key_version(inode); |
1da177e4 | 631 | |
bd4c625c | 632 | if (!file_capable(inode, block)) { |
26931309 | 633 | reiserfs_write_unlock_once(inode->i_sb, lock_depth); |
bd4c625c LT |
634 | return -EFBIG; |
635 | } | |
636 | ||
637 | /* if !create, we aren't changing the FS, so we don't need to | |
638 | ** log anything, so we don't need to start a transaction | |
639 | */ | |
640 | if (!(create & GET_BLOCK_CREATE)) { | |
641 | int ret; | |
642 | /* find number of block-th logical block of the file */ | |
643 | ret = _get_block_create_0(inode, block, bh_result, | |
644 | create | GET_BLOCK_READ_DIRECT); | |
26931309 | 645 | reiserfs_write_unlock_once(inode->i_sb, lock_depth); |
bd4c625c LT |
646 | return ret; |
647 | } | |
648 | /* | |
649 | * if we're already in a transaction, make sure to close | |
650 | * any new transactions we start in this func | |
651 | */ | |
652 | if ((create & GET_BLOCK_NO_DANGLE) || | |
653 | reiserfs_transaction_running(inode->i_sb)) | |
654 | dangle = 0; | |
655 | ||
656 | /* If file is of such a size, that it might have a tail and tails are enabled | |
657 | ** we should mark it as possibly needing tail packing on close | |
658 | */ | |
659 | if ((have_large_tails(inode->i_sb) | |
660 | && inode->i_size < i_block_size(inode) * 4) | |
661 | || (have_small_tails(inode->i_sb) | |
662 | && inode->i_size < i_block_size(inode))) | |
663 | REISERFS_I(inode)->i_flags |= i_pack_on_close_mask; | |
664 | ||
665 | /* set the key of the first byte in the 'block'-th block of file */ | |
666 | make_cpu_key(&key, inode, new_offset, TYPE_ANY, 3 /*key length */ ); | |
667 | if ((new_offset + inode->i_sb->s_blocksize - 1) > inode->i_size) { | |
668 | start_trans: | |
669 | th = reiserfs_persistent_transaction(inode->i_sb, jbegin_count); | |
670 | if (!th) { | |
671 | retval = -ENOMEM; | |
1da177e4 LT |
672 | goto failure; |
673 | } | |
bd4c625c LT |
674 | reiserfs_update_inode_transaction(inode); |
675 | } | |
676 | research: | |
1da177e4 | 677 | |
bd4c625c | 678 | retval = search_for_position_by_key(inode->i_sb, &key, &path); |
1da177e4 | 679 | if (retval == IO_ERROR) { |
bd4c625c LT |
680 | retval = -EIO; |
681 | goto failure; | |
682 | } | |
683 | ||
684 | bh = get_last_bh(&path); | |
685 | ih = get_ih(&path); | |
686 | item = get_item(&path); | |
1da177e4 | 687 | pos_in_item = path.pos_in_item; |
1da177e4 | 688 | |
bd4c625c LT |
689 | fs_gen = get_generation(inode->i_sb); |
690 | copy_item_head(&tmp_ih, ih); | |
691 | ||
692 | if (allocation_needed | |
693 | (retval, allocated_block_nr, ih, item, pos_in_item)) { | |
694 | /* we have to allocate block for the unformatted node */ | |
695 | if (!th) { | |
696 | pathrelse(&path); | |
697 | goto start_trans; | |
698 | } | |
699 | ||
700 | repeat = | |
701 | _allocate_block(th, block, inode, &allocated_block_nr, | |
702 | &path, create); | |
703 | ||
704 | if (repeat == NO_DISK_SPACE || repeat == QUOTA_EXCEEDED) { | |
705 | /* restart the transaction to give the journal a chance to free | |
706 | ** some blocks. releases the path, so we have to go back to | |
707 | ** research if we succeed on the second try | |
708 | */ | |
709 | SB_JOURNAL(inode->i_sb)->j_next_async_flush = 1; | |
710 | retval = restart_transaction(th, inode, &path); | |
711 | if (retval) | |
712 | goto failure; | |
713 | repeat = | |
714 | _allocate_block(th, block, inode, | |
715 | &allocated_block_nr, NULL, create); | |
716 | ||
717 | if (repeat != NO_DISK_SPACE && repeat != QUOTA_EXCEEDED) { | |
718 | goto research; | |
719 | } | |
720 | if (repeat == QUOTA_EXCEEDED) | |
721 | retval = -EDQUOT; | |
722 | else | |
723 | retval = -ENOSPC; | |
724 | goto failure; | |
725 | } | |
726 | ||
727 | if (fs_changed(fs_gen, inode->i_sb) | |
728 | && item_moved(&tmp_ih, &path)) { | |
729 | goto research; | |
730 | } | |
731 | } | |
732 | ||
733 | if (indirect_item_found(retval, ih)) { | |
734 | b_blocknr_t unfm_ptr; | |
735 | /* 'block'-th block is in the file already (there is | |
736 | corresponding cell in some indirect item). But it may be | |
737 | zero unformatted node pointer (hole) */ | |
738 | unfm_ptr = get_block_num(item, pos_in_item); | |
739 | if (unfm_ptr == 0) { | |
740 | /* use allocated block to plug the hole */ | |
741 | reiserfs_prepare_for_journal(inode->i_sb, bh, 1); | |
742 | if (fs_changed(fs_gen, inode->i_sb) | |
743 | && item_moved(&tmp_ih, &path)) { | |
744 | reiserfs_restore_prepared_buffer(inode->i_sb, | |
745 | bh); | |
746 | goto research; | |
747 | } | |
748 | set_buffer_new(bh_result); | |
749 | if (buffer_dirty(bh_result) | |
750 | && reiserfs_data_ordered(inode->i_sb)) | |
751 | reiserfs_add_ordered_list(inode, bh_result); | |
752 | put_block_num(item, pos_in_item, allocated_block_nr); | |
753 | unfm_ptr = allocated_block_nr; | |
754 | journal_mark_dirty(th, inode->i_sb, bh); | |
755 | reiserfs_update_sd(th, inode); | |
756 | } | |
757 | set_block_dev_mapped(bh_result, unfm_ptr, inode); | |
758 | pathrelse(&path); | |
759 | retval = 0; | |
760 | if (!dangle && th) | |
761 | retval = reiserfs_end_persistent_transaction(th); | |
762 | ||
26931309 | 763 | reiserfs_write_unlock_once(inode->i_sb, lock_depth); |
bd4c625c LT |
764 | |
765 | /* the item was found, so new blocks were not added to the file | |
0222e657 | 766 | ** there is no need to make sure the inode is updated with this |
bd4c625c LT |
767 | ** transaction |
768 | */ | |
769 | return retval; | |
770 | } | |
771 | ||
772 | if (!th) { | |
773 | pathrelse(&path); | |
774 | goto start_trans; | |
775 | } | |
776 | ||
777 | /* desired position is not found or is in the direct item. We have | |
778 | to append file with holes up to 'block'-th block converting | |
779 | direct items to indirect one if necessary */ | |
780 | done = 0; | |
781 | do { | |
782 | if (is_statdata_le_ih(ih)) { | |
783 | __le32 unp = 0; | |
784 | struct cpu_key tmp_key; | |
785 | ||
786 | /* indirect item has to be inserted */ | |
787 | make_le_item_head(&tmp_ih, &key, version, 1, | |
788 | TYPE_INDIRECT, UNFM_P_SIZE, | |
789 | 0 /* free_space */ ); | |
790 | ||
791 | if (cpu_key_k_offset(&key) == 1) { | |
792 | /* we are going to add 'block'-th block to the file. Use | |
793 | allocated block for that */ | |
794 | unp = cpu_to_le32(allocated_block_nr); | |
795 | set_block_dev_mapped(bh_result, | |
796 | allocated_block_nr, inode); | |
797 | set_buffer_new(bh_result); | |
798 | done = 1; | |
799 | } | |
800 | tmp_key = key; // ;) | |
801 | set_cpu_key_k_offset(&tmp_key, 1); | |
802 | PATH_LAST_POSITION(&path)++; | |
803 | ||
804 | retval = | |
805 | reiserfs_insert_item(th, &path, &tmp_key, &tmp_ih, | |
806 | inode, (char *)&unp); | |
807 | if (retval) { | |
808 | reiserfs_free_block(th, inode, | |
809 | allocated_block_nr, 1); | |
810 | goto failure; // retval == -ENOSPC, -EDQUOT or -EIO or -EEXIST | |
811 | } | |
812 | //mark_tail_converted (inode); | |
813 | } else if (is_direct_le_ih(ih)) { | |
814 | /* direct item has to be converted */ | |
815 | loff_t tail_offset; | |
816 | ||
817 | tail_offset = | |
818 | ((le_ih_k_offset(ih) - | |
819 | 1) & ~(inode->i_sb->s_blocksize - 1)) + 1; | |
820 | if (tail_offset == cpu_key_k_offset(&key)) { | |
821 | /* direct item we just found fits into block we have | |
822 | to map. Convert it into unformatted node: use | |
823 | bh_result for the conversion */ | |
824 | set_block_dev_mapped(bh_result, | |
825 | allocated_block_nr, inode); | |
826 | unbh = bh_result; | |
827 | done = 1; | |
828 | } else { | |
829 | /* we have to padd file tail stored in direct item(s) | |
830 | up to block size and convert it to unformatted | |
831 | node. FIXME: this should also get into page cache */ | |
832 | ||
833 | pathrelse(&path); | |
834 | /* | |
835 | * ugly, but we can only end the transaction if | |
836 | * we aren't nested | |
837 | */ | |
838 | BUG_ON(!th->t_refcount); | |
839 | if (th->t_refcount == 1) { | |
840 | retval = | |
841 | reiserfs_end_persistent_transaction | |
842 | (th); | |
843 | th = NULL; | |
844 | if (retval) | |
845 | goto failure; | |
846 | } | |
847 | ||
848 | retval = | |
849 | convert_tail_for_hole(inode, bh_result, | |
850 | tail_offset); | |
851 | if (retval) { | |
852 | if (retval != -ENOSPC) | |
0030b645 JM |
853 | reiserfs_error(inode->i_sb, |
854 | "clm-6004", | |
855 | "convert tail failed " | |
856 | "inode %lu, error %d", | |
857 | inode->i_ino, | |
858 | retval); | |
bd4c625c LT |
859 | if (allocated_block_nr) { |
860 | /* the bitmap, the super, and the stat data == 3 */ | |
861 | if (!th) | |
862 | th = reiserfs_persistent_transaction(inode->i_sb, 3); | |
863 | if (th) | |
864 | reiserfs_free_block(th, | |
865 | inode, | |
866 | allocated_block_nr, | |
867 | 1); | |
868 | } | |
869 | goto failure; | |
870 | } | |
871 | goto research; | |
872 | } | |
873 | retval = | |
874 | direct2indirect(th, inode, &path, unbh, | |
875 | tail_offset); | |
876 | if (retval) { | |
877 | reiserfs_unmap_buffer(unbh); | |
878 | reiserfs_free_block(th, inode, | |
879 | allocated_block_nr, 1); | |
880 | goto failure; | |
881 | } | |
882 | /* it is important the set_buffer_uptodate is done after | |
883 | ** the direct2indirect. The buffer might contain valid | |
884 | ** data newer than the data on disk (read by readpage, changed, | |
885 | ** and then sent here by writepage). direct2indirect needs | |
886 | ** to know if unbh was already up to date, so it can decide | |
887 | ** if the data in unbh needs to be replaced with data from | |
888 | ** the disk | |
889 | */ | |
890 | set_buffer_uptodate(unbh); | |
891 | ||
892 | /* unbh->b_page == NULL in case of DIRECT_IO request, this means | |
893 | buffer will disappear shortly, so it should not be added to | |
894 | */ | |
895 | if (unbh->b_page) { | |
896 | /* we've converted the tail, so we must | |
897 | ** flush unbh before the transaction commits | |
898 | */ | |
899 | reiserfs_add_tail_list(inode, unbh); | |
900 | ||
901 | /* mark it dirty now to prevent commit_write from adding | |
902 | ** this buffer to the inode's dirty buffer list | |
903 | */ | |
904 | /* | |
905 | * AKPM: changed __mark_buffer_dirty to mark_buffer_dirty(). | |
906 | * It's still atomic, but it sets the page dirty too, | |
907 | * which makes it eligible for writeback at any time by the | |
908 | * VM (which was also the case with __mark_buffer_dirty()) | |
909 | */ | |
910 | mark_buffer_dirty(unbh); | |
911 | } | |
912 | } else { | |
913 | /* append indirect item with holes if needed, when appending | |
914 | pointer to 'block'-th block use block, which is already | |
915 | allocated */ | |
916 | struct cpu_key tmp_key; | |
917 | unp_t unf_single = 0; // We use this in case we need to allocate only | |
918 | // one block which is a fastpath | |
919 | unp_t *un; | |
920 | __u64 max_to_insert = | |
921 | MAX_ITEM_LEN(inode->i_sb->s_blocksize) / | |
922 | UNFM_P_SIZE; | |
923 | __u64 blocks_needed; | |
924 | ||
925 | RFALSE(pos_in_item != ih_item_len(ih) / UNFM_P_SIZE, | |
926 | "vs-804: invalid position for append"); | |
927 | /* indirect item has to be appended, set up key of that position */ | |
928 | make_cpu_key(&tmp_key, inode, | |
929 | le_key_k_offset(version, | |
930 | &(ih->ih_key)) + | |
931 | op_bytes_number(ih, | |
932 | inode->i_sb->s_blocksize), | |
933 | //pos_in_item * inode->i_sb->s_blocksize, | |
934 | TYPE_INDIRECT, 3); // key type is unimportant | |
935 | ||
c499ec24 VS |
936 | RFALSE(cpu_key_k_offset(&tmp_key) > cpu_key_k_offset(&key), |
937 | "green-805: invalid offset"); | |
bd4c625c LT |
938 | blocks_needed = |
939 | 1 + | |
940 | ((cpu_key_k_offset(&key) - | |
941 | cpu_key_k_offset(&tmp_key)) >> inode->i_sb-> | |
942 | s_blocksize_bits); | |
bd4c625c LT |
943 | |
944 | if (blocks_needed == 1) { | |
945 | un = &unf_single; | |
946 | } else { | |
1d2c6cfd | 947 | un = kzalloc(min(blocks_needed, max_to_insert) * UNFM_P_SIZE, GFP_NOFS); |
bd4c625c LT |
948 | if (!un) { |
949 | un = &unf_single; | |
950 | blocks_needed = 1; | |
951 | max_to_insert = 0; | |
01afb213 | 952 | } |
bd4c625c LT |
953 | } |
954 | if (blocks_needed <= max_to_insert) { | |
955 | /* we are going to add target block to the file. Use allocated | |
956 | block for that */ | |
957 | un[blocks_needed - 1] = | |
958 | cpu_to_le32(allocated_block_nr); | |
959 | set_block_dev_mapped(bh_result, | |
960 | allocated_block_nr, inode); | |
961 | set_buffer_new(bh_result); | |
962 | done = 1; | |
963 | } else { | |
964 | /* paste hole to the indirect item */ | |
965 | /* If kmalloc failed, max_to_insert becomes zero and it means we | |
966 | only have space for one block */ | |
967 | blocks_needed = | |
968 | max_to_insert ? max_to_insert : 1; | |
969 | } | |
970 | retval = | |
971 | reiserfs_paste_into_item(th, &path, &tmp_key, inode, | |
972 | (char *)un, | |
973 | UNFM_P_SIZE * | |
974 | blocks_needed); | |
975 | ||
976 | if (blocks_needed != 1) | |
977 | kfree(un); | |
978 | ||
979 | if (retval) { | |
980 | reiserfs_free_block(th, inode, | |
981 | allocated_block_nr, 1); | |
982 | goto failure; | |
983 | } | |
984 | if (!done) { | |
985 | /* We need to mark new file size in case this function will be | |
986 | interrupted/aborted later on. And we may do this only for | |
987 | holes. */ | |
988 | inode->i_size += | |
989 | inode->i_sb->s_blocksize * blocks_needed; | |
990 | } | |
991 | } | |
1da177e4 | 992 | |
bd4c625c LT |
993 | if (done == 1) |
994 | break; | |
1da177e4 | 995 | |
bd4c625c LT |
996 | /* this loop could log more blocks than we had originally asked |
997 | ** for. So, we have to allow the transaction to end if it is | |
0222e657 | 998 | ** too big or too full. Update the inode so things are |
bd4c625c LT |
999 | ** consistent if we crash before the function returns |
1000 | ** | |
1001 | ** release the path so that anybody waiting on the path before | |
1002 | ** ending their transaction will be able to continue. | |
1003 | */ | |
1004 | if (journal_transaction_should_end(th, th->t_blocks_allocated)) { | |
1005 | retval = restart_transaction(th, inode, &path); | |
1006 | if (retval) | |
1007 | goto failure; | |
1008 | } | |
8ebc4232 FW |
1009 | /* |
1010 | * inserting indirect pointers for a hole can take a | |
1011 | * long time. reschedule if needed and also release the write | |
1012 | * lock for others. | |
bd4c625c | 1013 | */ |
26931309 FW |
1014 | if (need_resched()) { |
1015 | reiserfs_write_unlock_once(inode->i_sb, lock_depth); | |
1016 | schedule(); | |
1017 | lock_depth = reiserfs_write_lock_once(inode->i_sb); | |
1018 | } | |
1da177e4 | 1019 | |
bd4c625c LT |
1020 | retval = search_for_position_by_key(inode->i_sb, &key, &path); |
1021 | if (retval == IO_ERROR) { | |
1022 | retval = -EIO; | |
1023 | goto failure; | |
1024 | } | |
1025 | if (retval == POSITION_FOUND) { | |
45b03d5e | 1026 | reiserfs_warning(inode->i_sb, "vs-825", |
bd4c625c LT |
1027 | "%K should not be found", &key); |
1028 | retval = -EEXIST; | |
1029 | if (allocated_block_nr) | |
1030 | reiserfs_free_block(th, inode, | |
1031 | allocated_block_nr, 1); | |
1032 | pathrelse(&path); | |
1033 | goto failure; | |
1034 | } | |
1035 | bh = get_last_bh(&path); | |
1036 | ih = get_ih(&path); | |
1037 | item = get_item(&path); | |
1038 | pos_in_item = path.pos_in_item; | |
1039 | } while (1); | |
1040 | ||
1041 | retval = 0; | |
1042 | ||
1043 | failure: | |
1044 | if (th && (!dangle || (retval && !th->t_trans_id))) { | |
1045 | int err; | |
1046 | if (th->t_trans_id) | |
1047 | reiserfs_update_sd(th, inode); | |
1048 | err = reiserfs_end_persistent_transaction(th); | |
1049 | if (err) | |
1050 | retval = err; | |
1051 | } | |
1052 | ||
26931309 | 1053 | reiserfs_write_unlock_once(inode->i_sb, lock_depth); |
bd4c625c LT |
1054 | reiserfs_check_path(&path); |
1055 | return retval; | |
1da177e4 LT |
1056 | } |
1057 | ||
1058 | static int | |
1059 | reiserfs_readpages(struct file *file, struct address_space *mapping, | |
bd4c625c | 1060 | struct list_head *pages, unsigned nr_pages) |
1da177e4 | 1061 | { |
bd4c625c | 1062 | return mpage_readpages(mapping, pages, nr_pages, reiserfs_get_block); |
1da177e4 LT |
1063 | } |
1064 | ||
1065 | /* Compute real number of used bytes by file | |
1066 | * Following three functions can go away when we'll have enough space in stat item | |
1067 | */ | |
1068 | static int real_space_diff(struct inode *inode, int sd_size) | |
1069 | { | |
bd4c625c LT |
1070 | int bytes; |
1071 | loff_t blocksize = inode->i_sb->s_blocksize; | |
1072 | ||
1073 | if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) | |
1074 | return sd_size; | |
1075 | ||
1076 | /* End of file is also in full block with indirect reference, so round | |
1077 | ** up to the next block. | |
1078 | ** | |
1079 | ** there is just no way to know if the tail is actually packed | |
1080 | ** on the file, so we have to assume it isn't. When we pack the | |
1081 | ** tail, we add 4 bytes to pretend there really is an unformatted | |
1082 | ** node pointer | |
1083 | */ | |
1084 | bytes = | |
1085 | ((inode->i_size + | |
1086 | (blocksize - 1)) >> inode->i_sb->s_blocksize_bits) * UNFM_P_SIZE + | |
1087 | sd_size; | |
1088 | return bytes; | |
1da177e4 LT |
1089 | } |
1090 | ||
1091 | static inline loff_t to_real_used_space(struct inode *inode, ulong blocks, | |
bd4c625c | 1092 | int sd_size) |
1da177e4 | 1093 | { |
bd4c625c LT |
1094 | if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) { |
1095 | return inode->i_size + | |
1096 | (loff_t) (real_space_diff(inode, sd_size)); | |
1097 | } | |
1098 | return ((loff_t) real_space_diff(inode, sd_size)) + | |
1099 | (((loff_t) blocks) << 9); | |
1da177e4 LT |
1100 | } |
1101 | ||
1102 | /* Compute number of blocks used by file in ReiserFS counting */ | |
1103 | static inline ulong to_fake_used_blocks(struct inode *inode, int sd_size) | |
1104 | { | |
bd4c625c LT |
1105 | loff_t bytes = inode_get_bytes(inode); |
1106 | loff_t real_space = real_space_diff(inode, sd_size); | |
1107 | ||
1108 | /* keeps fsck and non-quota versions of reiserfs happy */ | |
1109 | if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) { | |
1110 | bytes += (loff_t) 511; | |
1111 | } | |
1112 | ||
1113 | /* files from before the quota patch might i_blocks such that | |
1114 | ** bytes < real_space. Deal with that here to prevent it from | |
1115 | ** going negative. | |
1116 | */ | |
1117 | if (bytes < real_space) | |
1118 | return 0; | |
1119 | return (bytes - real_space) >> 9; | |
1da177e4 LT |
1120 | } |
1121 | ||
1122 | // | |
1123 | // BAD: new directories have stat data of new type and all other items | |
1124 | // of old type. Version stored in the inode says about body items, so | |
1125 | // in update_stat_data we can not rely on inode, but have to check | |
1126 | // item version directly | |
1127 | // | |
1128 | ||
1129 | // called by read_locked_inode | |
fec6d055 | 1130 | static void init_inode(struct inode *inode, struct treepath *path) |
1da177e4 | 1131 | { |
bd4c625c LT |
1132 | struct buffer_head *bh; |
1133 | struct item_head *ih; | |
1134 | __u32 rdev; | |
1135 | //int version = ITEM_VERSION_1; | |
1136 | ||
1137 | bh = PATH_PLAST_BUFFER(path); | |
1138 | ih = PATH_PITEM_HEAD(path); | |
1139 | ||
1140 | copy_key(INODE_PKEY(inode), &(ih->ih_key)); | |
bd4c625c LT |
1141 | |
1142 | INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list)); | |
1143 | REISERFS_I(inode)->i_flags = 0; | |
1144 | REISERFS_I(inode)->i_prealloc_block = 0; | |
1145 | REISERFS_I(inode)->i_prealloc_count = 0; | |
1146 | REISERFS_I(inode)->i_trans_id = 0; | |
1147 | REISERFS_I(inode)->i_jl = NULL; | |
068fbb31 | 1148 | reiserfs_init_xattr_rwsem(inode); |
bd4c625c LT |
1149 | |
1150 | if (stat_data_v1(ih)) { | |
1151 | struct stat_data_v1 *sd = | |
1152 | (struct stat_data_v1 *)B_I_PITEM(bh, ih); | |
1153 | unsigned long blocks; | |
1154 | ||
1155 | set_inode_item_key_version(inode, KEY_FORMAT_3_5); | |
1156 | set_inode_sd_version(inode, STAT_DATA_V1); | |
1157 | inode->i_mode = sd_v1_mode(sd); | |
1158 | inode->i_nlink = sd_v1_nlink(sd); | |
1159 | inode->i_uid = sd_v1_uid(sd); | |
1160 | inode->i_gid = sd_v1_gid(sd); | |
1161 | inode->i_size = sd_v1_size(sd); | |
1162 | inode->i_atime.tv_sec = sd_v1_atime(sd); | |
1163 | inode->i_mtime.tv_sec = sd_v1_mtime(sd); | |
1164 | inode->i_ctime.tv_sec = sd_v1_ctime(sd); | |
1165 | inode->i_atime.tv_nsec = 0; | |
1166 | inode->i_ctime.tv_nsec = 0; | |
1167 | inode->i_mtime.tv_nsec = 0; | |
1168 | ||
1169 | inode->i_blocks = sd_v1_blocks(sd); | |
1170 | inode->i_generation = le32_to_cpu(INODE_PKEY(inode)->k_dir_id); | |
1171 | blocks = (inode->i_size + 511) >> 9; | |
1172 | blocks = _ROUND_UP(blocks, inode->i_sb->s_blocksize >> 9); | |
1173 | if (inode->i_blocks > blocks) { | |
1174 | // there was a bug in <=3.5.23 when i_blocks could take negative | |
1175 | // values. Starting from 3.5.17 this value could even be stored in | |
1176 | // stat data. For such files we set i_blocks based on file | |
1177 | // size. Just 2 notes: this can be wrong for sparce files. On-disk value will be | |
1178 | // only updated if file's inode will ever change | |
1179 | inode->i_blocks = blocks; | |
1180 | } | |
1da177e4 | 1181 | |
bd4c625c LT |
1182 | rdev = sd_v1_rdev(sd); |
1183 | REISERFS_I(inode)->i_first_direct_byte = | |
1184 | sd_v1_first_direct_byte(sd); | |
1185 | /* an early bug in the quota code can give us an odd number for the | |
1186 | ** block count. This is incorrect, fix it here. | |
1187 | */ | |
1188 | if (inode->i_blocks & 1) { | |
1189 | inode->i_blocks++; | |
1190 | } | |
1191 | inode_set_bytes(inode, | |
1192 | to_real_used_space(inode, inode->i_blocks, | |
1193 | SD_V1_SIZE)); | |
1194 | /* nopack is initially zero for v1 objects. For v2 objects, | |
1195 | nopack is initialised from sd_attrs */ | |
1196 | REISERFS_I(inode)->i_flags &= ~i_nopack_mask; | |
1197 | } else { | |
1198 | // new stat data found, but object may have old items | |
1199 | // (directories and symlinks) | |
1200 | struct stat_data *sd = (struct stat_data *)B_I_PITEM(bh, ih); | |
1201 | ||
1202 | inode->i_mode = sd_v2_mode(sd); | |
1203 | inode->i_nlink = sd_v2_nlink(sd); | |
1204 | inode->i_uid = sd_v2_uid(sd); | |
1205 | inode->i_size = sd_v2_size(sd); | |
1206 | inode->i_gid = sd_v2_gid(sd); | |
1207 | inode->i_mtime.tv_sec = sd_v2_mtime(sd); | |
1208 | inode->i_atime.tv_sec = sd_v2_atime(sd); | |
1209 | inode->i_ctime.tv_sec = sd_v2_ctime(sd); | |
1210 | inode->i_ctime.tv_nsec = 0; | |
1211 | inode->i_mtime.tv_nsec = 0; | |
1212 | inode->i_atime.tv_nsec = 0; | |
1213 | inode->i_blocks = sd_v2_blocks(sd); | |
1214 | rdev = sd_v2_rdev(sd); | |
1215 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
1216 | inode->i_generation = | |
1217 | le32_to_cpu(INODE_PKEY(inode)->k_dir_id); | |
1218 | else | |
1219 | inode->i_generation = sd_v2_generation(sd); | |
1da177e4 | 1220 | |
bd4c625c LT |
1221 | if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) |
1222 | set_inode_item_key_version(inode, KEY_FORMAT_3_5); | |
1223 | else | |
1224 | set_inode_item_key_version(inode, KEY_FORMAT_3_6); | |
1225 | REISERFS_I(inode)->i_first_direct_byte = 0; | |
1226 | set_inode_sd_version(inode, STAT_DATA_V2); | |
1227 | inode_set_bytes(inode, | |
1228 | to_real_used_space(inode, inode->i_blocks, | |
1229 | SD_V2_SIZE)); | |
421f91d2 | 1230 | /* read persistent inode attributes from sd and initialise |
bd4c625c LT |
1231 | generic inode flags from them */ |
1232 | REISERFS_I(inode)->i_attrs = sd_v2_attrs(sd); | |
1233 | sd_attrs_to_i_attrs(sd_v2_attrs(sd), inode); | |
1234 | } | |
1235 | ||
1236 | pathrelse(path); | |
1237 | if (S_ISREG(inode->i_mode)) { | |
1238 | inode->i_op = &reiserfs_file_inode_operations; | |
1239 | inode->i_fop = &reiserfs_file_operations; | |
1240 | inode->i_mapping->a_ops = &reiserfs_address_space_operations; | |
1241 | } else if (S_ISDIR(inode->i_mode)) { | |
1242 | inode->i_op = &reiserfs_dir_inode_operations; | |
1243 | inode->i_fop = &reiserfs_dir_operations; | |
1244 | } else if (S_ISLNK(inode->i_mode)) { | |
1245 | inode->i_op = &reiserfs_symlink_inode_operations; | |
1246 | inode->i_mapping->a_ops = &reiserfs_address_space_operations; | |
1247 | } else { | |
1248 | inode->i_blocks = 0; | |
1249 | inode->i_op = &reiserfs_special_inode_operations; | |
1250 | init_special_inode(inode, inode->i_mode, new_decode_dev(rdev)); | |
1251 | } | |
1252 | } | |
1da177e4 LT |
1253 | |
1254 | // update new stat data with inode fields | |
bd4c625c | 1255 | static void inode2sd(void *sd, struct inode *inode, loff_t size) |
1da177e4 | 1256 | { |
bd4c625c LT |
1257 | struct stat_data *sd_v2 = (struct stat_data *)sd; |
1258 | __u16 flags; | |
1259 | ||
1260 | set_sd_v2_mode(sd_v2, inode->i_mode); | |
1261 | set_sd_v2_nlink(sd_v2, inode->i_nlink); | |
1262 | set_sd_v2_uid(sd_v2, inode->i_uid); | |
1263 | set_sd_v2_size(sd_v2, size); | |
1264 | set_sd_v2_gid(sd_v2, inode->i_gid); | |
1265 | set_sd_v2_mtime(sd_v2, inode->i_mtime.tv_sec); | |
1266 | set_sd_v2_atime(sd_v2, inode->i_atime.tv_sec); | |
1267 | set_sd_v2_ctime(sd_v2, inode->i_ctime.tv_sec); | |
1268 | set_sd_v2_blocks(sd_v2, to_fake_used_blocks(inode, SD_V2_SIZE)); | |
1269 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
1270 | set_sd_v2_rdev(sd_v2, new_encode_dev(inode->i_rdev)); | |
1271 | else | |
1272 | set_sd_v2_generation(sd_v2, inode->i_generation); | |
1273 | flags = REISERFS_I(inode)->i_attrs; | |
1274 | i_attrs_to_sd_attrs(inode, &flags); | |
1275 | set_sd_v2_attrs(sd_v2, flags); | |
1da177e4 LT |
1276 | } |
1277 | ||
1da177e4 | 1278 | // used to copy inode's fields to old stat data |
bd4c625c | 1279 | static void inode2sd_v1(void *sd, struct inode *inode, loff_t size) |
1da177e4 | 1280 | { |
bd4c625c LT |
1281 | struct stat_data_v1 *sd_v1 = (struct stat_data_v1 *)sd; |
1282 | ||
1283 | set_sd_v1_mode(sd_v1, inode->i_mode); | |
1284 | set_sd_v1_uid(sd_v1, inode->i_uid); | |
1285 | set_sd_v1_gid(sd_v1, inode->i_gid); | |
1286 | set_sd_v1_nlink(sd_v1, inode->i_nlink); | |
1287 | set_sd_v1_size(sd_v1, size); | |
1288 | set_sd_v1_atime(sd_v1, inode->i_atime.tv_sec); | |
1289 | set_sd_v1_ctime(sd_v1, inode->i_ctime.tv_sec); | |
1290 | set_sd_v1_mtime(sd_v1, inode->i_mtime.tv_sec); | |
1291 | ||
1292 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
1293 | set_sd_v1_rdev(sd_v1, new_encode_dev(inode->i_rdev)); | |
1294 | else | |
1295 | set_sd_v1_blocks(sd_v1, to_fake_used_blocks(inode, SD_V1_SIZE)); | |
1da177e4 | 1296 | |
bd4c625c LT |
1297 | // Sigh. i_first_direct_byte is back |
1298 | set_sd_v1_first_direct_byte(sd_v1, | |
1299 | REISERFS_I(inode)->i_first_direct_byte); | |
1300 | } | |
1da177e4 LT |
1301 | |
1302 | /* NOTE, you must prepare the buffer head before sending it here, | |
1303 | ** and then log it after the call | |
1304 | */ | |
fec6d055 | 1305 | static void update_stat_data(struct treepath *path, struct inode *inode, |
bd4c625c | 1306 | loff_t size) |
1da177e4 | 1307 | { |
bd4c625c LT |
1308 | struct buffer_head *bh; |
1309 | struct item_head *ih; | |
1310 | ||
1311 | bh = PATH_PLAST_BUFFER(path); | |
1312 | ih = PATH_PITEM_HEAD(path); | |
1313 | ||
1314 | if (!is_statdata_le_ih(ih)) | |
c3a9c210 | 1315 | reiserfs_panic(inode->i_sb, "vs-13065", "key %k, found item %h", |
bd4c625c LT |
1316 | INODE_PKEY(inode), ih); |
1317 | ||
1318 | if (stat_data_v1(ih)) { | |
1319 | // path points to old stat data | |
1320 | inode2sd_v1(B_I_PITEM(bh, ih), inode, size); | |
1321 | } else { | |
1322 | inode2sd(B_I_PITEM(bh, ih), inode, size); | |
1323 | } | |
1da177e4 | 1324 | |
bd4c625c LT |
1325 | return; |
1326 | } | |
1da177e4 | 1327 | |
bd4c625c LT |
1328 | void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th, |
1329 | struct inode *inode, loff_t size) | |
1da177e4 | 1330 | { |
bd4c625c LT |
1331 | struct cpu_key key; |
1332 | INITIALIZE_PATH(path); | |
1333 | struct buffer_head *bh; | |
1334 | int fs_gen; | |
1335 | struct item_head *ih, tmp_ih; | |
1336 | int retval; | |
1337 | ||
1338 | BUG_ON(!th->t_trans_id); | |
1339 | ||
1340 | make_cpu_key(&key, inode, SD_OFFSET, TYPE_STAT_DATA, 3); //key type is unimportant | |
1341 | ||
1342 | for (;;) { | |
1343 | int pos; | |
1344 | /* look for the object's stat data */ | |
1345 | retval = search_item(inode->i_sb, &key, &path); | |
1346 | if (retval == IO_ERROR) { | |
0030b645 JM |
1347 | reiserfs_error(inode->i_sb, "vs-13050", |
1348 | "i/o failure occurred trying to " | |
1349 | "update %K stat data", &key); | |
bd4c625c LT |
1350 | return; |
1351 | } | |
1352 | if (retval == ITEM_NOT_FOUND) { | |
1353 | pos = PATH_LAST_POSITION(&path); | |
1354 | pathrelse(&path); | |
1355 | if (inode->i_nlink == 0) { | |
1356 | /*reiserfs_warning (inode->i_sb, "vs-13050: reiserfs_update_sd: i_nlink == 0, stat data not found"); */ | |
1357 | return; | |
1358 | } | |
45b03d5e JM |
1359 | reiserfs_warning(inode->i_sb, "vs-13060", |
1360 | "stat data of object %k (nlink == %d) " | |
1361 | "not found (pos %d)", | |
bd4c625c LT |
1362 | INODE_PKEY(inode), inode->i_nlink, |
1363 | pos); | |
1364 | reiserfs_check_path(&path); | |
1365 | return; | |
1366 | } | |
1367 | ||
1368 | /* sigh, prepare_for_journal might schedule. When it schedules the | |
1369 | ** FS might change. We have to detect that, and loop back to the | |
1370 | ** search if the stat data item has moved | |
1371 | */ | |
1372 | bh = get_last_bh(&path); | |
1373 | ih = get_ih(&path); | |
1374 | copy_item_head(&tmp_ih, ih); | |
1375 | fs_gen = get_generation(inode->i_sb); | |
1376 | reiserfs_prepare_for_journal(inode->i_sb, bh, 1); | |
1377 | if (fs_changed(fs_gen, inode->i_sb) | |
1378 | && item_moved(&tmp_ih, &path)) { | |
1379 | reiserfs_restore_prepared_buffer(inode->i_sb, bh); | |
1380 | continue; /* Stat_data item has been moved after scheduling. */ | |
1381 | } | |
1382 | break; | |
1383 | } | |
1384 | update_stat_data(&path, inode, size); | |
1385 | journal_mark_dirty(th, th->t_super, bh); | |
1386 | pathrelse(&path); | |
1387 | return; | |
1da177e4 LT |
1388 | } |
1389 | ||
1390 | /* reiserfs_read_locked_inode is called to read the inode off disk, and it | |
1391 | ** does a make_bad_inode when things go wrong. But, we need to make sure | |
1392 | ** and clear the key in the private portion of the inode, otherwise a | |
1393 | ** corresponding iput might try to delete whatever object the inode last | |
1394 | ** represented. | |
1395 | */ | |
bd4c625c LT |
1396 | static void reiserfs_make_bad_inode(struct inode *inode) |
1397 | { | |
1398 | memset(INODE_PKEY(inode), 0, KEY_SIZE); | |
1399 | make_bad_inode(inode); | |
1da177e4 LT |
1400 | } |
1401 | ||
1402 | // | |
1403 | // initially this function was derived from minix or ext2's analog and | |
1404 | // evolved as the prototype did | |
1405 | // | |
1406 | ||
bd4c625c | 1407 | int reiserfs_init_locked_inode(struct inode *inode, void *p) |
1da177e4 | 1408 | { |
bd4c625c LT |
1409 | struct reiserfs_iget_args *args = (struct reiserfs_iget_args *)p; |
1410 | inode->i_ino = args->objectid; | |
1411 | INODE_PKEY(inode)->k_dir_id = cpu_to_le32(args->dirid); | |
1412 | return 0; | |
1da177e4 LT |
1413 | } |
1414 | ||
1415 | /* looks for stat data in the tree, and fills up the fields of in-core | |
1416 | inode stat data fields */ | |
bd4c625c LT |
1417 | void reiserfs_read_locked_inode(struct inode *inode, |
1418 | struct reiserfs_iget_args *args) | |
1da177e4 | 1419 | { |
bd4c625c LT |
1420 | INITIALIZE_PATH(path_to_sd); |
1421 | struct cpu_key key; | |
1422 | unsigned long dirino; | |
1423 | int retval; | |
1424 | ||
1425 | dirino = args->dirid; | |
1426 | ||
1427 | /* set version 1, version 2 could be used too, because stat data | |
1428 | key is the same in both versions */ | |
1429 | key.version = KEY_FORMAT_3_5; | |
1430 | key.on_disk_key.k_dir_id = dirino; | |
1431 | key.on_disk_key.k_objectid = inode->i_ino; | |
1432 | key.on_disk_key.k_offset = 0; | |
1433 | key.on_disk_key.k_type = 0; | |
1434 | ||
1435 | /* look for the object's stat data */ | |
1436 | retval = search_item(inode->i_sb, &key, &path_to_sd); | |
1437 | if (retval == IO_ERROR) { | |
0030b645 JM |
1438 | reiserfs_error(inode->i_sb, "vs-13070", |
1439 | "i/o failure occurred trying to find " | |
1440 | "stat data of %K", &key); | |
bd4c625c LT |
1441 | reiserfs_make_bad_inode(inode); |
1442 | return; | |
1443 | } | |
1444 | if (retval != ITEM_FOUND) { | |
1445 | /* a stale NFS handle can trigger this without it being an error */ | |
1446 | pathrelse(&path_to_sd); | |
1447 | reiserfs_make_bad_inode(inode); | |
1448 | inode->i_nlink = 0; | |
1449 | return; | |
1450 | } | |
1451 | ||
1452 | init_inode(inode, &path_to_sd); | |
1453 | ||
1454 | /* It is possible that knfsd is trying to access inode of a file | |
1455 | that is being removed from the disk by some other thread. As we | |
1456 | update sd on unlink all that is required is to check for nlink | |
1457 | here. This bug was first found by Sizif when debugging | |
1458 | SquidNG/Butterfly, forgotten, and found again after Philippe | |
0222e657 | 1459 | Gramoulle <philippe.gramoulle@mmania.com> reproduced it. |
bd4c625c LT |
1460 | |
1461 | More logical fix would require changes in fs/inode.c:iput() to | |
1462 | remove inode from hash-table _after_ fs cleaned disk stuff up and | |
1463 | in iget() to return NULL if I_FREEING inode is found in | |
1464 | hash-table. */ | |
1465 | /* Currently there is one place where it's ok to meet inode with | |
1466 | nlink==0: processing of open-unlinked and half-truncated files | |
1467 | during mount (fs/reiserfs/super.c:finish_unfinished()). */ | |
1468 | if ((inode->i_nlink == 0) && | |
1469 | !REISERFS_SB(inode->i_sb)->s_is_unlinked_ok) { | |
45b03d5e | 1470 | reiserfs_warning(inode->i_sb, "vs-13075", |
bd4c625c LT |
1471 | "dead inode read from disk %K. " |
1472 | "This is likely to be race with knfsd. Ignore", | |
1473 | &key); | |
1474 | reiserfs_make_bad_inode(inode); | |
1475 | } | |
1476 | ||
1477 | reiserfs_check_path(&path_to_sd); /* init inode should be relsing */ | |
1da177e4 LT |
1478 | |
1479 | } | |
1480 | ||
1481 | /** | |
1482 | * reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked(). | |
1483 | * | |
1484 | * @inode: inode from hash table to check | |
1485 | * @opaque: "cookie" passed to iget5_locked(). This is &reiserfs_iget_args. | |
1486 | * | |
1487 | * This function is called by iget5_locked() to distinguish reiserfs inodes | |
1488 | * having the same inode numbers. Such inodes can only exist due to some | |
1489 | * error condition. One of them should be bad. Inodes with identical | |
1490 | * inode numbers (objectids) are distinguished by parent directory ids. | |
1491 | * | |
1492 | */ | |
bd4c625c | 1493 | int reiserfs_find_actor(struct inode *inode, void *opaque) |
1da177e4 | 1494 | { |
bd4c625c | 1495 | struct reiserfs_iget_args *args; |
1da177e4 | 1496 | |
bd4c625c LT |
1497 | args = opaque; |
1498 | /* args is already in CPU order */ | |
1499 | return (inode->i_ino == args->objectid) && | |
1500 | (le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args->dirid); | |
1da177e4 LT |
1501 | } |
1502 | ||
bd4c625c | 1503 | struct inode *reiserfs_iget(struct super_block *s, const struct cpu_key *key) |
1da177e4 | 1504 | { |
bd4c625c LT |
1505 | struct inode *inode; |
1506 | struct reiserfs_iget_args args; | |
1507 | ||
1508 | args.objectid = key->on_disk_key.k_objectid; | |
1509 | args.dirid = key->on_disk_key.k_dir_id; | |
175359f8 | 1510 | reiserfs_write_unlock(s); |
bd4c625c LT |
1511 | inode = iget5_locked(s, key->on_disk_key.k_objectid, |
1512 | reiserfs_find_actor, reiserfs_init_locked_inode, | |
1513 | (void *)(&args)); | |
175359f8 | 1514 | reiserfs_write_lock(s); |
bd4c625c LT |
1515 | if (!inode) |
1516 | return ERR_PTR(-ENOMEM); | |
1517 | ||
1518 | if (inode->i_state & I_NEW) { | |
1519 | reiserfs_read_locked_inode(inode, &args); | |
1520 | unlock_new_inode(inode); | |
1521 | } | |
1522 | ||
1523 | if (comp_short_keys(INODE_PKEY(inode), key) || is_bad_inode(inode)) { | |
1524 | /* either due to i/o error or a stale NFS handle */ | |
1525 | iput(inode); | |
1526 | inode = NULL; | |
1527 | } | |
1528 | return inode; | |
1da177e4 LT |
1529 | } |
1530 | ||
be55caf1 CH |
1531 | static struct dentry *reiserfs_get_dentry(struct super_block *sb, |
1532 | u32 objectid, u32 dir_id, u32 generation) | |
1533 | ||
1da177e4 | 1534 | { |
bd4c625c | 1535 | struct cpu_key key; |
bd4c625c LT |
1536 | struct inode *inode; |
1537 | ||
be55caf1 CH |
1538 | key.on_disk_key.k_objectid = objectid; |
1539 | key.on_disk_key.k_dir_id = dir_id; | |
bd4c625c LT |
1540 | reiserfs_write_lock(sb); |
1541 | inode = reiserfs_iget(sb, &key); | |
be55caf1 CH |
1542 | if (inode && !IS_ERR(inode) && generation != 0 && |
1543 | generation != inode->i_generation) { | |
bd4c625c LT |
1544 | iput(inode); |
1545 | inode = NULL; | |
1546 | } | |
1547 | reiserfs_write_unlock(sb); | |
44003728 CH |
1548 | |
1549 | return d_obtain_alias(inode); | |
1da177e4 LT |
1550 | } |
1551 | ||
be55caf1 CH |
1552 | struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, struct fid *fid, |
1553 | int fh_len, int fh_type) | |
bd4c625c | 1554 | { |
bd4c625c LT |
1555 | /* fhtype happens to reflect the number of u32s encoded. |
1556 | * due to a bug in earlier code, fhtype might indicate there | |
1557 | * are more u32s then actually fitted. | |
1558 | * so if fhtype seems to be more than len, reduce fhtype. | |
1559 | * Valid types are: | |
1560 | * 2 - objectid + dir_id - legacy support | |
1561 | * 3 - objectid + dir_id + generation | |
1562 | * 4 - objectid + dir_id + objectid and dirid of parent - legacy | |
1563 | * 5 - objectid + dir_id + generation + objectid and dirid of parent | |
1564 | * 6 - as above plus generation of directory | |
1565 | * 6 does not fit in NFSv2 handles | |
1566 | */ | |
be55caf1 CH |
1567 | if (fh_type > fh_len) { |
1568 | if (fh_type != 6 || fh_len != 5) | |
45b03d5e | 1569 | reiserfs_warning(sb, "reiserfs-13077", |
be55caf1 CH |
1570 | "nfsd/reiserfs, fhtype=%d, len=%d - odd", |
1571 | fh_type, fh_len); | |
1572 | fh_type = 5; | |
bd4c625c LT |
1573 | } |
1574 | ||
be55caf1 CH |
1575 | return reiserfs_get_dentry(sb, fid->raw[0], fid->raw[1], |
1576 | (fh_type == 3 || fh_type >= 5) ? fid->raw[2] : 0); | |
1577 | } | |
1da177e4 | 1578 | |
be55caf1 CH |
1579 | struct dentry *reiserfs_fh_to_parent(struct super_block *sb, struct fid *fid, |
1580 | int fh_len, int fh_type) | |
1581 | { | |
1582 | if (fh_type < 4) | |
1583 | return NULL; | |
1584 | ||
1585 | return reiserfs_get_dentry(sb, | |
1586 | (fh_type >= 5) ? fid->raw[3] : fid->raw[2], | |
1587 | (fh_type >= 5) ? fid->raw[4] : fid->raw[3], | |
1588 | (fh_type == 6) ? fid->raw[5] : 0); | |
1da177e4 LT |
1589 | } |
1590 | ||
bd4c625c LT |
1591 | int reiserfs_encode_fh(struct dentry *dentry, __u32 * data, int *lenp, |
1592 | int need_parent) | |
1593 | { | |
1594 | struct inode *inode = dentry->d_inode; | |
1595 | int maxlen = *lenp; | |
1596 | ||
1597 | if (maxlen < 3) | |
1598 | return 255; | |
1599 | ||
1600 | data[0] = inode->i_ino; | |
1601 | data[1] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id); | |
1602 | data[2] = inode->i_generation; | |
1603 | *lenp = 3; | |
1604 | /* no room for directory info? return what we've stored so far */ | |
1605 | if (maxlen < 5 || !need_parent) | |
1606 | return 3; | |
1607 | ||
1608 | spin_lock(&dentry->d_lock); | |
1609 | inode = dentry->d_parent->d_inode; | |
1610 | data[3] = inode->i_ino; | |
1611 | data[4] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id); | |
1612 | *lenp = 5; | |
1613 | if (maxlen >= 6) { | |
1614 | data[5] = inode->i_generation; | |
1615 | *lenp = 6; | |
1616 | } | |
1617 | spin_unlock(&dentry->d_lock); | |
1618 | return *lenp; | |
1619 | } | |
1da177e4 LT |
1620 | |
1621 | /* looks for stat data, then copies fields to it, marks the buffer | |
1622 | containing stat data as dirty */ | |
1623 | /* reiserfs inodes are never really dirty, since the dirty inode call | |
1624 | ** always logs them. This call allows the VFS inode marking routines | |
1625 | ** to properly mark inodes for datasync and such, but only actually | |
1626 | ** does something when called for a synchronous update. | |
1627 | */ | |
a9185b41 | 1628 | int reiserfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
bd4c625c LT |
1629 | { |
1630 | struct reiserfs_transaction_handle th; | |
1631 | int jbegin_count = 1; | |
1632 | ||
1633 | if (inode->i_sb->s_flags & MS_RDONLY) | |
1634 | return -EROFS; | |
1635 | /* memory pressure can sometimes initiate write_inode calls with sync == 1, | |
0222e657 | 1636 | ** these cases are just when the system needs ram, not when the |
bd4c625c LT |
1637 | ** inode needs to reach disk for safety, and they can safely be |
1638 | ** ignored because the altered inode has already been logged. | |
1639 | */ | |
a9185b41 | 1640 | if (wbc->sync_mode == WB_SYNC_ALL && !(current->flags & PF_MEMALLOC)) { |
bd4c625c LT |
1641 | reiserfs_write_lock(inode->i_sb); |
1642 | if (!journal_begin(&th, inode->i_sb, jbegin_count)) { | |
1643 | reiserfs_update_sd(&th, inode); | |
1644 | journal_end_sync(&th, inode->i_sb, jbegin_count); | |
1645 | } | |
1646 | reiserfs_write_unlock(inode->i_sb); | |
1647 | } | |
1648 | return 0; | |
1da177e4 LT |
1649 | } |
1650 | ||
1651 | /* stat data of new object is inserted already, this inserts the item | |
1652 | containing "." and ".." entries */ | |
bd4c625c LT |
1653 | static int reiserfs_new_directory(struct reiserfs_transaction_handle *th, |
1654 | struct inode *inode, | |
fec6d055 | 1655 | struct item_head *ih, struct treepath *path, |
bd4c625c | 1656 | struct inode *dir) |
1da177e4 | 1657 | { |
bd4c625c LT |
1658 | struct super_block *sb = th->t_super; |
1659 | char empty_dir[EMPTY_DIR_SIZE]; | |
1660 | char *body = empty_dir; | |
1661 | struct cpu_key key; | |
1662 | int retval; | |
1663 | ||
1664 | BUG_ON(!th->t_trans_id); | |
1665 | ||
1666 | _make_cpu_key(&key, KEY_FORMAT_3_5, le32_to_cpu(ih->ih_key.k_dir_id), | |
1667 | le32_to_cpu(ih->ih_key.k_objectid), DOT_OFFSET, | |
1668 | TYPE_DIRENTRY, 3 /*key length */ ); | |
1669 | ||
1670 | /* compose item head for new item. Directories consist of items of | |
1671 | old type (ITEM_VERSION_1). Do not set key (second arg is 0), it | |
1672 | is done by reiserfs_new_inode */ | |
1673 | if (old_format_only(sb)) { | |
1674 | make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET, | |
1675 | TYPE_DIRENTRY, EMPTY_DIR_SIZE_V1, 2); | |
1676 | ||
1677 | make_empty_dir_item_v1(body, ih->ih_key.k_dir_id, | |
1678 | ih->ih_key.k_objectid, | |
1679 | INODE_PKEY(dir)->k_dir_id, | |
1680 | INODE_PKEY(dir)->k_objectid); | |
1681 | } else { | |
1682 | make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET, | |
1683 | TYPE_DIRENTRY, EMPTY_DIR_SIZE, 2); | |
1684 | ||
1685 | make_empty_dir_item(body, ih->ih_key.k_dir_id, | |
1686 | ih->ih_key.k_objectid, | |
1687 | INODE_PKEY(dir)->k_dir_id, | |
1688 | INODE_PKEY(dir)->k_objectid); | |
1689 | } | |
1690 | ||
1691 | /* look for place in the tree for new item */ | |
1692 | retval = search_item(sb, &key, path); | |
1693 | if (retval == IO_ERROR) { | |
0030b645 JM |
1694 | reiserfs_error(sb, "vs-13080", |
1695 | "i/o failure occurred creating new directory"); | |
bd4c625c LT |
1696 | return -EIO; |
1697 | } | |
1698 | if (retval == ITEM_FOUND) { | |
1699 | pathrelse(path); | |
45b03d5e | 1700 | reiserfs_warning(sb, "vs-13070", |
bd4c625c LT |
1701 | "object with this key exists (%k)", |
1702 | &(ih->ih_key)); | |
1703 | return -EEXIST; | |
1704 | } | |
1da177e4 | 1705 | |
bd4c625c LT |
1706 | /* insert item, that is empty directory item */ |
1707 | return reiserfs_insert_item(th, path, &key, ih, inode, body); | |
1708 | } | |
1da177e4 LT |
1709 | |
1710 | /* stat data of object has been inserted, this inserts the item | |
1711 | containing the body of symlink */ | |
bd4c625c LT |
1712 | static int reiserfs_new_symlink(struct reiserfs_transaction_handle *th, struct inode *inode, /* Inode of symlink */ |
1713 | struct item_head *ih, | |
fec6d055 | 1714 | struct treepath *path, const char *symname, |
bd4c625c | 1715 | int item_len) |
1da177e4 | 1716 | { |
bd4c625c LT |
1717 | struct super_block *sb = th->t_super; |
1718 | struct cpu_key key; | |
1719 | int retval; | |
1720 | ||
1721 | BUG_ON(!th->t_trans_id); | |
1722 | ||
1723 | _make_cpu_key(&key, KEY_FORMAT_3_5, | |
1724 | le32_to_cpu(ih->ih_key.k_dir_id), | |
1725 | le32_to_cpu(ih->ih_key.k_objectid), | |
1726 | 1, TYPE_DIRECT, 3 /*key length */ ); | |
1727 | ||
1728 | make_le_item_head(ih, NULL, KEY_FORMAT_3_5, 1, TYPE_DIRECT, item_len, | |
1729 | 0 /*free_space */ ); | |
1730 | ||
1731 | /* look for place in the tree for new item */ | |
1732 | retval = search_item(sb, &key, path); | |
1733 | if (retval == IO_ERROR) { | |
0030b645 JM |
1734 | reiserfs_error(sb, "vs-13080", |
1735 | "i/o failure occurred creating new symlink"); | |
bd4c625c LT |
1736 | return -EIO; |
1737 | } | |
1738 | if (retval == ITEM_FOUND) { | |
1739 | pathrelse(path); | |
45b03d5e | 1740 | reiserfs_warning(sb, "vs-13080", |
bd4c625c LT |
1741 | "object with this key exists (%k)", |
1742 | &(ih->ih_key)); | |
1743 | return -EEXIST; | |
1744 | } | |
1da177e4 | 1745 | |
bd4c625c LT |
1746 | /* insert item, that is body of symlink */ |
1747 | return reiserfs_insert_item(th, path, &key, ih, inode, symname); | |
1748 | } | |
1da177e4 LT |
1749 | |
1750 | /* inserts the stat data into the tree, and then calls | |
1751 | reiserfs_new_directory (to insert ".", ".." item if new object is | |
1752 | directory) or reiserfs_new_symlink (to insert symlink body if new | |
0222e657 | 1753 | object is symlink) or nothing (if new object is regular file) |
1da177e4 LT |
1754 | |
1755 | NOTE! uid and gid must already be set in the inode. If we return | |
1756 | non-zero due to an error, we have to drop the quota previously allocated | |
1757 | for the fresh inode. This can only be done outside a transaction, so | |
1758 | if we return non-zero, we also end the transaction. */ | |
bd4c625c LT |
1759 | int reiserfs_new_inode(struct reiserfs_transaction_handle *th, |
1760 | struct inode *dir, int mode, const char *symname, | |
0222e657 | 1761 | /* 0 for regular, EMTRY_DIR_SIZE for dirs, |
bd4c625c LT |
1762 | strlen (symname) for symlinks) */ |
1763 | loff_t i_size, struct dentry *dentry, | |
57fe60df JM |
1764 | struct inode *inode, |
1765 | struct reiserfs_security_handle *security) | |
1da177e4 | 1766 | { |
bd4c625c | 1767 | struct super_block *sb; |
c1eaa26b | 1768 | struct reiserfs_iget_args args; |
bd4c625c LT |
1769 | INITIALIZE_PATH(path_to_key); |
1770 | struct cpu_key key; | |
1771 | struct item_head ih; | |
1772 | struct stat_data sd; | |
1773 | int retval; | |
1774 | int err; | |
1775 | ||
1776 | BUG_ON(!th->t_trans_id); | |
1777 | ||
871a2931 | 1778 | dquot_initialize(inode); |
63936dda CH |
1779 | err = dquot_alloc_inode(inode); |
1780 | if (err) | |
bd4c625c | 1781 | goto out_end_trans; |
585b7747 | 1782 | if (!dir->i_nlink) { |
bd4c625c LT |
1783 | err = -EPERM; |
1784 | goto out_bad_inode; | |
1785 | } | |
1786 | ||
1787 | sb = dir->i_sb; | |
1788 | ||
1789 | /* item head of new item */ | |
1790 | ih.ih_key.k_dir_id = reiserfs_choose_packing(dir); | |
1791 | ih.ih_key.k_objectid = cpu_to_le32(reiserfs_get_unused_objectid(th)); | |
1792 | if (!ih.ih_key.k_objectid) { | |
1793 | err = -ENOMEM; | |
1794 | goto out_bad_inode; | |
1795 | } | |
c1eaa26b | 1796 | args.objectid = inode->i_ino = le32_to_cpu(ih.ih_key.k_objectid); |
2f1169e2 AV |
1797 | if (old_format_only(sb)) |
1798 | make_le_item_head(&ih, NULL, KEY_FORMAT_3_5, SD_OFFSET, | |
1799 | TYPE_STAT_DATA, SD_V1_SIZE, MAX_US_INT); | |
1800 | else | |
1801 | make_le_item_head(&ih, NULL, KEY_FORMAT_3_6, SD_OFFSET, | |
1802 | TYPE_STAT_DATA, SD_SIZE, MAX_US_INT); | |
c1eaa26b AV |
1803 | memcpy(INODE_PKEY(inode), &(ih.ih_key), KEY_SIZE); |
1804 | args.dirid = le32_to_cpu(ih.ih_key.k_dir_id); | |
1805 | if (insert_inode_locked4(inode, args.objectid, | |
1806 | reiserfs_find_actor, &args) < 0) { | |
1807 | err = -EINVAL; | |
1808 | goto out_bad_inode; | |
1809 | } | |
bd4c625c | 1810 | if (old_format_only(sb)) |
0222e657 | 1811 | /* not a perfect generation count, as object ids can be reused, but |
bd4c625c LT |
1812 | ** this is as good as reiserfs can do right now. |
1813 | ** note that the private part of inode isn't filled in yet, we have | |
1814 | ** to use the directory. | |
1815 | */ | |
1816 | inode->i_generation = le32_to_cpu(INODE_PKEY(dir)->k_objectid); | |
1817 | else | |
1da177e4 | 1818 | #if defined( USE_INODE_GENERATION_COUNTER ) |
bd4c625c LT |
1819 | inode->i_generation = |
1820 | le32_to_cpu(REISERFS_SB(sb)->s_rs->s_inode_generation); | |
1da177e4 | 1821 | #else |
bd4c625c | 1822 | inode->i_generation = ++event; |
1da177e4 LT |
1823 | #endif |
1824 | ||
bd4c625c LT |
1825 | /* fill stat data */ |
1826 | inode->i_nlink = (S_ISDIR(mode) ? 2 : 1); | |
1827 | ||
1828 | /* uid and gid must already be set by the caller for quota init */ | |
1829 | ||
1830 | /* symlink cannot be immutable or append only, right? */ | |
1831 | if (S_ISLNK(inode->i_mode)) | |
1832 | inode->i_flags &= ~(S_IMMUTABLE | S_APPEND); | |
1833 | ||
1834 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; | |
1835 | inode->i_size = i_size; | |
1836 | inode->i_blocks = 0; | |
1837 | inode->i_bytes = 0; | |
1838 | REISERFS_I(inode)->i_first_direct_byte = S_ISLNK(mode) ? 1 : | |
1839 | U32_MAX /*NO_BYTES_IN_DIRECT_ITEM */ ; | |
1840 | ||
1841 | INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list)); | |
1842 | REISERFS_I(inode)->i_flags = 0; | |
1843 | REISERFS_I(inode)->i_prealloc_block = 0; | |
1844 | REISERFS_I(inode)->i_prealloc_count = 0; | |
1845 | REISERFS_I(inode)->i_trans_id = 0; | |
1846 | REISERFS_I(inode)->i_jl = NULL; | |
1847 | REISERFS_I(inode)->i_attrs = | |
1848 | REISERFS_I(dir)->i_attrs & REISERFS_INHERIT_MASK; | |
1849 | sd_attrs_to_i_attrs(REISERFS_I(inode)->i_attrs, inode); | |
068fbb31 | 1850 | reiserfs_init_xattr_rwsem(inode); |
bd4c625c | 1851 | |
bd4c625c LT |
1852 | /* key to search for correct place for new stat data */ |
1853 | _make_cpu_key(&key, KEY_FORMAT_3_6, le32_to_cpu(ih.ih_key.k_dir_id), | |
1854 | le32_to_cpu(ih.ih_key.k_objectid), SD_OFFSET, | |
1855 | TYPE_STAT_DATA, 3 /*key length */ ); | |
1856 | ||
1857 | /* find proper place for inserting of stat data */ | |
1858 | retval = search_item(sb, &key, &path_to_key); | |
1859 | if (retval == IO_ERROR) { | |
1860 | err = -EIO; | |
1861 | goto out_bad_inode; | |
1862 | } | |
1863 | if (retval == ITEM_FOUND) { | |
1864 | pathrelse(&path_to_key); | |
1865 | err = -EEXIST; | |
1866 | goto out_bad_inode; | |
1867 | } | |
1868 | if (old_format_only(sb)) { | |
1869 | if (inode->i_uid & ~0xffff || inode->i_gid & ~0xffff) { | |
1870 | pathrelse(&path_to_key); | |
1871 | /* i_uid or i_gid is too big to be stored in stat data v3.5 */ | |
1872 | err = -EINVAL; | |
1873 | goto out_bad_inode; | |
1874 | } | |
1875 | inode2sd_v1(&sd, inode, inode->i_size); | |
1876 | } else { | |
1877 | inode2sd(&sd, inode, inode->i_size); | |
1878 | } | |
bd4c625c LT |
1879 | // store in in-core inode the key of stat data and version all |
1880 | // object items will have (directory items will have old offset | |
1881 | // format, other new objects will consist of new items) | |
bd4c625c LT |
1882 | if (old_format_only(sb) || S_ISDIR(mode) || S_ISLNK(mode)) |
1883 | set_inode_item_key_version(inode, KEY_FORMAT_3_5); | |
1884 | else | |
1885 | set_inode_item_key_version(inode, KEY_FORMAT_3_6); | |
1886 | if (old_format_only(sb)) | |
1887 | set_inode_sd_version(inode, STAT_DATA_V1); | |
1888 | else | |
1889 | set_inode_sd_version(inode, STAT_DATA_V2); | |
1890 | ||
1891 | /* insert the stat data into the tree */ | |
1da177e4 | 1892 | #ifdef DISPLACE_NEW_PACKING_LOCALITIES |
bd4c625c LT |
1893 | if (REISERFS_I(dir)->new_packing_locality) |
1894 | th->displace_new_blocks = 1; | |
1da177e4 | 1895 | #endif |
bd4c625c LT |
1896 | retval = |
1897 | reiserfs_insert_item(th, &path_to_key, &key, &ih, inode, | |
1898 | (char *)(&sd)); | |
1899 | if (retval) { | |
1900 | err = retval; | |
1901 | reiserfs_check_path(&path_to_key); | |
1902 | goto out_bad_inode; | |
1903 | } | |
1da177e4 | 1904 | #ifdef DISPLACE_NEW_PACKING_LOCALITIES |
bd4c625c LT |
1905 | if (!th->displace_new_blocks) |
1906 | REISERFS_I(dir)->new_packing_locality = 0; | |
1da177e4 | 1907 | #endif |
bd4c625c LT |
1908 | if (S_ISDIR(mode)) { |
1909 | /* insert item with "." and ".." */ | |
1910 | retval = | |
1911 | reiserfs_new_directory(th, inode, &ih, &path_to_key, dir); | |
1912 | } | |
1913 | ||
1914 | if (S_ISLNK(mode)) { | |
1915 | /* insert body of symlink */ | |
1916 | if (!old_format_only(sb)) | |
1917 | i_size = ROUND_UP(i_size); | |
1918 | retval = | |
1919 | reiserfs_new_symlink(th, inode, &ih, &path_to_key, symname, | |
1920 | i_size); | |
1921 | } | |
1922 | if (retval) { | |
1923 | err = retval; | |
1924 | reiserfs_check_path(&path_to_key); | |
1925 | journal_end(th, th->t_super, th->t_blocks_allocated); | |
1926 | goto out_inserted_sd; | |
1927 | } | |
1928 | ||
bd4c625c | 1929 | if (reiserfs_posixacl(inode->i_sb)) { |
0ab2621e | 1930 | retval = reiserfs_inherit_default_acl(th, dir, dentry, inode); |
bd4c625c LT |
1931 | if (retval) { |
1932 | err = retval; | |
1933 | reiserfs_check_path(&path_to_key); | |
1934 | journal_end(th, th->t_super, th->t_blocks_allocated); | |
1935 | goto out_inserted_sd; | |
1936 | } | |
1937 | } else if (inode->i_sb->s_flags & MS_POSIXACL) { | |
45b03d5e JM |
1938 | reiserfs_warning(inode->i_sb, "jdm-13090", |
1939 | "ACLs aren't enabled in the fs, " | |
bd4c625c | 1940 | "but vfs thinks they are!"); |
6dfede69 JM |
1941 | } else if (IS_PRIVATE(dir)) |
1942 | inode->i_flags |= S_PRIVATE; | |
bd4c625c | 1943 | |
57fe60df JM |
1944 | if (security->name) { |
1945 | retval = reiserfs_security_write(th, inode, security); | |
1946 | if (retval) { | |
1947 | err = retval; | |
1948 | reiserfs_check_path(&path_to_key); | |
1949 | retval = journal_end(th, th->t_super, | |
1950 | th->t_blocks_allocated); | |
1951 | if (retval) | |
1952 | err = retval; | |
1953 | goto out_inserted_sd; | |
1954 | } | |
bd4c625c LT |
1955 | } |
1956 | ||
bd4c625c LT |
1957 | reiserfs_update_sd(th, inode); |
1958 | reiserfs_check_path(&path_to_key); | |
1959 | ||
1960 | return 0; | |
1da177e4 LT |
1961 | |
1962 | /* it looks like you can easily compress these two goto targets into | |
1963 | * one. Keeping it like this doesn't actually hurt anything, and they | |
1964 | * are place holders for what the quota code actually needs. | |
1965 | */ | |
bd4c625c LT |
1966 | out_bad_inode: |
1967 | /* Invalidate the object, nothing was inserted yet */ | |
1968 | INODE_PKEY(inode)->k_objectid = 0; | |
1969 | ||
1970 | /* Quota change must be inside a transaction for journaling */ | |
63936dda | 1971 | dquot_free_inode(inode); |
bd4c625c LT |
1972 | |
1973 | out_end_trans: | |
1974 | journal_end(th, th->t_super, th->t_blocks_allocated); | |
1975 | /* Drop can be outside and it needs more credits so it's better to have it outside */ | |
9f754758 | 1976 | dquot_drop(inode); |
bd4c625c LT |
1977 | inode->i_flags |= S_NOQUOTA; |
1978 | make_bad_inode(inode); | |
1979 | ||
1980 | out_inserted_sd: | |
1981 | inode->i_nlink = 0; | |
1982 | th->t_trans_id = 0; /* so the caller can't use this handle later */ | |
c1eaa26b | 1983 | unlock_new_inode(inode); /* OK to do even if we hadn't locked it */ |
d984561b | 1984 | iput(inode); |
bd4c625c | 1985 | return err; |
1da177e4 LT |
1986 | } |
1987 | ||
1988 | /* | |
1989 | ** finds the tail page in the page cache, | |
1990 | ** reads the last block in. | |
1991 | ** | |
1992 | ** On success, page_result is set to a locked, pinned page, and bh_result | |
1993 | ** is set to an up to date buffer for the last block in the file. returns 0. | |
1994 | ** | |
1995 | ** tail conversion is not done, so bh_result might not be valid for writing | |
1996 | ** check buffer_mapped(bh_result) and bh_result->b_blocknr != 0 before | |
1997 | ** trying to write the block. | |
1998 | ** | |
1999 | ** on failure, nonzero is returned, page_result and bh_result are untouched. | |
2000 | */ | |
995c762e | 2001 | static int grab_tail_page(struct inode *inode, |
bd4c625c LT |
2002 | struct page **page_result, |
2003 | struct buffer_head **bh_result) | |
2004 | { | |
2005 | ||
2006 | /* we want the page with the last byte in the file, | |
2007 | ** not the page that will hold the next byte for appending | |
2008 | */ | |
995c762e | 2009 | unsigned long index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; |
bd4c625c LT |
2010 | unsigned long pos = 0; |
2011 | unsigned long start = 0; | |
995c762e JM |
2012 | unsigned long blocksize = inode->i_sb->s_blocksize; |
2013 | unsigned long offset = (inode->i_size) & (PAGE_CACHE_SIZE - 1); | |
bd4c625c LT |
2014 | struct buffer_head *bh; |
2015 | struct buffer_head *head; | |
2016 | struct page *page; | |
2017 | int error; | |
2018 | ||
2019 | /* we know that we are only called with inode->i_size > 0. | |
2020 | ** we also know that a file tail can never be as big as a block | |
2021 | ** If i_size % blocksize == 0, our file is currently block aligned | |
2022 | ** and it won't need converting or zeroing after a truncate. | |
2023 | */ | |
2024 | if ((offset & (blocksize - 1)) == 0) { | |
2025 | return -ENOENT; | |
2026 | } | |
995c762e | 2027 | page = grab_cache_page(inode->i_mapping, index); |
bd4c625c LT |
2028 | error = -ENOMEM; |
2029 | if (!page) { | |
2030 | goto out; | |
2031 | } | |
2032 | /* start within the page of the last block in the file */ | |
2033 | start = (offset / blocksize) * blocksize; | |
2034 | ||
2035 | error = block_prepare_write(page, start, offset, | |
2036 | reiserfs_get_block_create_0); | |
2037 | if (error) | |
2038 | goto unlock; | |
2039 | ||
2040 | head = page_buffers(page); | |
2041 | bh = head; | |
2042 | do { | |
2043 | if (pos >= start) { | |
2044 | break; | |
2045 | } | |
2046 | bh = bh->b_this_page; | |
2047 | pos += blocksize; | |
2048 | } while (bh != head); | |
2049 | ||
2050 | if (!buffer_uptodate(bh)) { | |
2051 | /* note, this should never happen, prepare_write should | |
2052 | ** be taking care of this for us. If the buffer isn't up to date, | |
2053 | ** I've screwed up the code to find the buffer, or the code to | |
2054 | ** call prepare_write | |
2055 | */ | |
995c762e | 2056 | reiserfs_error(inode->i_sb, "clm-6000", |
0030b645 | 2057 | "error reading block %lu", bh->b_blocknr); |
bd4c625c LT |
2058 | error = -EIO; |
2059 | goto unlock; | |
2060 | } | |
2061 | *bh_result = bh; | |
2062 | *page_result = page; | |
2063 | ||
2064 | out: | |
2065 | return error; | |
2066 | ||
2067 | unlock: | |
2068 | unlock_page(page); | |
2069 | page_cache_release(page); | |
2070 | return error; | |
1da177e4 LT |
2071 | } |
2072 | ||
2073 | /* | |
2074 | ** vfs version of truncate file. Must NOT be called with | |
2075 | ** a transaction already started. | |
2076 | ** | |
2077 | ** some code taken from block_truncate_page | |
2078 | */ | |
995c762e | 2079 | int reiserfs_truncate_file(struct inode *inode, int update_timestamps) |
bd4c625c LT |
2080 | { |
2081 | struct reiserfs_transaction_handle th; | |
2082 | /* we want the offset for the first byte after the end of the file */ | |
995c762e JM |
2083 | unsigned long offset = inode->i_size & (PAGE_CACHE_SIZE - 1); |
2084 | unsigned blocksize = inode->i_sb->s_blocksize; | |
bd4c625c LT |
2085 | unsigned length; |
2086 | struct page *page = NULL; | |
2087 | int error; | |
2088 | struct buffer_head *bh = NULL; | |
24996049 | 2089 | int err2; |
22c963ad | 2090 | int lock_depth; |
bd4c625c | 2091 | |
22c963ad | 2092 | lock_depth = reiserfs_write_lock_once(inode->i_sb); |
bd4c625c | 2093 | |
995c762e JM |
2094 | if (inode->i_size > 0) { |
2095 | error = grab_tail_page(inode, &page, &bh); | |
2096 | if (error) { | |
0222e657 | 2097 | // -ENOENT means we truncated past the end of the file, |
bd4c625c LT |
2098 | // and get_block_create_0 could not find a block to read in, |
2099 | // which is ok. | |
2100 | if (error != -ENOENT) | |
995c762e | 2101 | reiserfs_error(inode->i_sb, "clm-6001", |
0030b645 JM |
2102 | "grab_tail_page failed %d", |
2103 | error); | |
bd4c625c LT |
2104 | page = NULL; |
2105 | bh = NULL; | |
2106 | } | |
2107 | } | |
1da177e4 | 2108 | |
0222e657 JM |
2109 | /* so, if page != NULL, we have a buffer head for the offset at |
2110 | ** the end of the file. if the bh is mapped, and bh->b_blocknr != 0, | |
2111 | ** then we have an unformatted node. Otherwise, we have a direct item, | |
2112 | ** and no zeroing is required on disk. We zero after the truncate, | |
2113 | ** because the truncate might pack the item anyway | |
bd4c625c | 2114 | ** (it will unmap bh if it packs). |
1da177e4 | 2115 | */ |
bd4c625c LT |
2116 | /* it is enough to reserve space in transaction for 2 balancings: |
2117 | one for "save" link adding and another for the first | |
2118 | cut_from_item. 1 is for update_sd */ | |
995c762e | 2119 | error = journal_begin(&th, inode->i_sb, |
bd4c625c LT |
2120 | JOURNAL_PER_BALANCE_CNT * 2 + 1); |
2121 | if (error) | |
2122 | goto out; | |
995c762e | 2123 | reiserfs_update_inode_transaction(inode); |
bd4c625c LT |
2124 | if (update_timestamps) |
2125 | /* we are doing real truncate: if the system crashes before the last | |
2126 | transaction of truncating gets committed - on reboot the file | |
2127 | either appears truncated properly or not truncated at all */ | |
995c762e JM |
2128 | add_save_link(&th, inode, 1); |
2129 | err2 = reiserfs_do_truncate(&th, inode, page, update_timestamps); | |
bd4c625c | 2130 | error = |
995c762e | 2131 | journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT * 2 + 1); |
bd4c625c LT |
2132 | if (error) |
2133 | goto out; | |
2134 | ||
24996049 JM |
2135 | /* check reiserfs_do_truncate after ending the transaction */ |
2136 | if (err2) { | |
2137 | error = err2; | |
2138 | goto out; | |
2139 | } | |
2140 | ||
bd4c625c | 2141 | if (update_timestamps) { |
995c762e | 2142 | error = remove_save_link(inode, 1 /* truncate */); |
bd4c625c LT |
2143 | if (error) |
2144 | goto out; | |
2145 | } | |
2146 | ||
2147 | if (page) { | |
2148 | length = offset & (blocksize - 1); | |
2149 | /* if we are not on a block boundary */ | |
2150 | if (length) { | |
bd4c625c | 2151 | length = blocksize - length; |
eebd2aa3 | 2152 | zero_user(page, offset, length); |
bd4c625c LT |
2153 | if (buffer_mapped(bh) && bh->b_blocknr != 0) { |
2154 | mark_buffer_dirty(bh); | |
2155 | } | |
2156 | } | |
2157 | unlock_page(page); | |
2158 | page_cache_release(page); | |
2159 | } | |
2160 | ||
22c963ad FW |
2161 | reiserfs_write_unlock_once(inode->i_sb, lock_depth); |
2162 | ||
bd4c625c LT |
2163 | return 0; |
2164 | out: | |
2165 | if (page) { | |
2166 | unlock_page(page); | |
2167 | page_cache_release(page); | |
2168 | } | |
22c963ad FW |
2169 | |
2170 | reiserfs_write_unlock_once(inode->i_sb, lock_depth); | |
2171 | ||
bd4c625c LT |
2172 | return error; |
2173 | } | |
2174 | ||
2175 | static int map_block_for_writepage(struct inode *inode, | |
2176 | struct buffer_head *bh_result, | |
2177 | unsigned long block) | |
2178 | { | |
2179 | struct reiserfs_transaction_handle th; | |
2180 | int fs_gen; | |
2181 | struct item_head tmp_ih; | |
2182 | struct item_head *ih; | |
2183 | struct buffer_head *bh; | |
2184 | __le32 *item; | |
2185 | struct cpu_key key; | |
2186 | INITIALIZE_PATH(path); | |
2187 | int pos_in_item; | |
2188 | int jbegin_count = JOURNAL_PER_BALANCE_CNT; | |
7729ac5e | 2189 | loff_t byte_offset = ((loff_t)block << inode->i_sb->s_blocksize_bits)+1; |
bd4c625c LT |
2190 | int retval; |
2191 | int use_get_block = 0; | |
2192 | int bytes_copied = 0; | |
2193 | int copy_size; | |
2194 | int trans_running = 0; | |
2195 | ||
2196 | /* catch places below that try to log something without starting a trans */ | |
2197 | th.t_trans_id = 0; | |
2198 | ||
2199 | if (!buffer_uptodate(bh_result)) { | |
2200 | return -EIO; | |
2201 | } | |
2202 | ||
2203 | kmap(bh_result->b_page); | |
2204 | start_over: | |
2205 | reiserfs_write_lock(inode->i_sb); | |
2206 | make_cpu_key(&key, inode, byte_offset, TYPE_ANY, 3); | |
2207 | ||
2208 | research: | |
2209 | retval = search_for_position_by_key(inode->i_sb, &key, &path); | |
2210 | if (retval != POSITION_FOUND) { | |
2211 | use_get_block = 1; | |
2212 | goto out; | |
2213 | } | |
2214 | ||
2215 | bh = get_last_bh(&path); | |
2216 | ih = get_ih(&path); | |
2217 | item = get_item(&path); | |
2218 | pos_in_item = path.pos_in_item; | |
2219 | ||
2220 | /* we've found an unformatted node */ | |
2221 | if (indirect_item_found(retval, ih)) { | |
2222 | if (bytes_copied > 0) { | |
45b03d5e JM |
2223 | reiserfs_warning(inode->i_sb, "clm-6002", |
2224 | "bytes_copied %d", bytes_copied); | |
bd4c625c LT |
2225 | } |
2226 | if (!get_block_num(item, pos_in_item)) { | |
2227 | /* crap, we are writing to a hole */ | |
2228 | use_get_block = 1; | |
2229 | goto out; | |
2230 | } | |
2231 | set_block_dev_mapped(bh_result, | |
2232 | get_block_num(item, pos_in_item), inode); | |
2233 | } else if (is_direct_le_ih(ih)) { | |
2234 | char *p; | |
2235 | p = page_address(bh_result->b_page); | |
2236 | p += (byte_offset - 1) & (PAGE_CACHE_SIZE - 1); | |
2237 | copy_size = ih_item_len(ih) - pos_in_item; | |
2238 | ||
2239 | fs_gen = get_generation(inode->i_sb); | |
2240 | copy_item_head(&tmp_ih, ih); | |
2241 | ||
2242 | if (!trans_running) { | |
2243 | /* vs-3050 is gone, no need to drop the path */ | |
2244 | retval = journal_begin(&th, inode->i_sb, jbegin_count); | |
2245 | if (retval) | |
2246 | goto out; | |
2247 | reiserfs_update_inode_transaction(inode); | |
2248 | trans_running = 1; | |
2249 | if (fs_changed(fs_gen, inode->i_sb) | |
2250 | && item_moved(&tmp_ih, &path)) { | |
2251 | reiserfs_restore_prepared_buffer(inode->i_sb, | |
2252 | bh); | |
2253 | goto research; | |
2254 | } | |
2255 | } | |
2256 | ||
2257 | reiserfs_prepare_for_journal(inode->i_sb, bh, 1); | |
2258 | ||
2259 | if (fs_changed(fs_gen, inode->i_sb) | |
2260 | && item_moved(&tmp_ih, &path)) { | |
2261 | reiserfs_restore_prepared_buffer(inode->i_sb, bh); | |
2262 | goto research; | |
2263 | } | |
2264 | ||
2265 | memcpy(B_I_PITEM(bh, ih) + pos_in_item, p + bytes_copied, | |
2266 | copy_size); | |
2267 | ||
2268 | journal_mark_dirty(&th, inode->i_sb, bh); | |
2269 | bytes_copied += copy_size; | |
2270 | set_block_dev_mapped(bh_result, 0, inode); | |
2271 | ||
2272 | /* are there still bytes left? */ | |
2273 | if (bytes_copied < bh_result->b_size && | |
2274 | (byte_offset + bytes_copied) < inode->i_size) { | |
2275 | set_cpu_key_k_offset(&key, | |
2276 | cpu_key_k_offset(&key) + | |
2277 | copy_size); | |
2278 | goto research; | |
2279 | } | |
2280 | } else { | |
45b03d5e JM |
2281 | reiserfs_warning(inode->i_sb, "clm-6003", |
2282 | "bad item inode %lu", inode->i_ino); | |
bd4c625c LT |
2283 | retval = -EIO; |
2284 | goto out; | |
2285 | } | |
2286 | retval = 0; | |
2287 | ||
2288 | out: | |
2289 | pathrelse(&path); | |
2290 | if (trans_running) { | |
2291 | int err = journal_end(&th, inode->i_sb, jbegin_count); | |
2292 | if (err) | |
2293 | retval = err; | |
2294 | trans_running = 0; | |
2295 | } | |
2296 | reiserfs_write_unlock(inode->i_sb); | |
2297 | ||
2298 | /* this is where we fill in holes in the file. */ | |
2299 | if (use_get_block) { | |
2300 | retval = reiserfs_get_block(inode, block, bh_result, | |
1b1dcc1b | 2301 | GET_BLOCK_CREATE | GET_BLOCK_NO_IMUX |
bd4c625c LT |
2302 | | GET_BLOCK_NO_DANGLE); |
2303 | if (!retval) { | |
2304 | if (!buffer_mapped(bh_result) | |
2305 | || bh_result->b_blocknr == 0) { | |
2306 | /* get_block failed to find a mapped unformatted node. */ | |
2307 | use_get_block = 0; | |
2308 | goto start_over; | |
2309 | } | |
2310 | } | |
2311 | } | |
2312 | kunmap(bh_result->b_page); | |
2313 | ||
2314 | if (!retval && buffer_mapped(bh_result) && bh_result->b_blocknr == 0) { | |
2315 | /* we've copied data from the page into the direct item, so the | |
2316 | * buffer in the page is now clean, mark it to reflect that. | |
2317 | */ | |
2318 | lock_buffer(bh_result); | |
2319 | clear_buffer_dirty(bh_result); | |
2320 | unlock_buffer(bh_result); | |
2321 | } | |
2322 | return retval; | |
1da177e4 LT |
2323 | } |
2324 | ||
0222e657 JM |
2325 | /* |
2326 | * mason@suse.com: updated in 2.5.54 to follow the same general io | |
1da177e4 LT |
2327 | * start/recovery path as __block_write_full_page, along with special |
2328 | * code to handle reiserfs tails. | |
2329 | */ | |
bd4c625c LT |
2330 | static int reiserfs_write_full_page(struct page *page, |
2331 | struct writeback_control *wbc) | |
2332 | { | |
2333 | struct inode *inode = page->mapping->host; | |
2334 | unsigned long end_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
2335 | int error = 0; | |
2336 | unsigned long block; | |
b4c76fa7 | 2337 | sector_t last_block; |
bd4c625c LT |
2338 | struct buffer_head *head, *bh; |
2339 | int partial = 0; | |
2340 | int nr = 0; | |
2341 | int checked = PageChecked(page); | |
2342 | struct reiserfs_transaction_handle th; | |
2343 | struct super_block *s = inode->i_sb; | |
2344 | int bh_per_page = PAGE_CACHE_SIZE / s->s_blocksize; | |
2345 | th.t_trans_id = 0; | |
2346 | ||
e0e851cf CM |
2347 | /* no logging allowed when nonblocking or from PF_MEMALLOC */ |
2348 | if (checked && (current->flags & PF_MEMALLOC)) { | |
2349 | redirty_page_for_writepage(wbc, page); | |
2350 | unlock_page(page); | |
2351 | return 0; | |
2352 | } | |
2353 | ||
bd4c625c LT |
2354 | /* The page dirty bit is cleared before writepage is called, which |
2355 | * means we have to tell create_empty_buffers to make dirty buffers | |
2356 | * The page really should be up to date at this point, so tossing | |
2357 | * in the BH_Uptodate is just a sanity check. | |
2358 | */ | |
2359 | if (!page_has_buffers(page)) { | |
2360 | create_empty_buffers(page, s->s_blocksize, | |
2361 | (1 << BH_Dirty) | (1 << BH_Uptodate)); | |
2362 | } | |
2363 | head = page_buffers(page); | |
1da177e4 | 2364 | |
bd4c625c LT |
2365 | /* last page in the file, zero out any contents past the |
2366 | ** last byte in the file | |
2367 | */ | |
2368 | if (page->index >= end_index) { | |
bd4c625c LT |
2369 | unsigned last_offset; |
2370 | ||
2371 | last_offset = inode->i_size & (PAGE_CACHE_SIZE - 1); | |
2372 | /* no file contents in this page */ | |
2373 | if (page->index >= end_index + 1 || !last_offset) { | |
2374 | unlock_page(page); | |
2375 | return 0; | |
2376 | } | |
eebd2aa3 | 2377 | zero_user_segment(page, last_offset, PAGE_CACHE_SIZE); |
1da177e4 | 2378 | } |
bd4c625c LT |
2379 | bh = head; |
2380 | block = page->index << (PAGE_CACHE_SHIFT - s->s_blocksize_bits); | |
b4c76fa7 | 2381 | last_block = (i_size_read(inode) - 1) >> inode->i_blkbits; |
bd4c625c LT |
2382 | /* first map all the buffers, logging any direct items we find */ |
2383 | do { | |
b4c76fa7 CM |
2384 | if (block > last_block) { |
2385 | /* | |
2386 | * This can happen when the block size is less than | |
2387 | * the page size. The corresponding bytes in the page | |
2388 | * were zero filled above | |
2389 | */ | |
2390 | clear_buffer_dirty(bh); | |
2391 | set_buffer_uptodate(bh); | |
2392 | } else if ((checked || buffer_dirty(bh)) && | |
2393 | (!buffer_mapped(bh) || (buffer_mapped(bh) | |
bd4c625c LT |
2394 | && bh->b_blocknr == |
2395 | 0))) { | |
2396 | /* not mapped yet, or it points to a direct item, search | |
2397 | * the btree for the mapping info, and log any direct | |
2398 | * items found | |
2399 | */ | |
2400 | if ((error = map_block_for_writepage(inode, bh, block))) { | |
2401 | goto fail; | |
2402 | } | |
2403 | } | |
2404 | bh = bh->b_this_page; | |
2405 | block++; | |
2406 | } while (bh != head); | |
2407 | ||
2408 | /* | |
2409 | * we start the transaction after map_block_for_writepage, | |
2410 | * because it can create holes in the file (an unbounded operation). | |
2411 | * starting it here, we can make a reliable estimate for how many | |
2412 | * blocks we're going to log | |
1da177e4 | 2413 | */ |
bd4c625c LT |
2414 | if (checked) { |
2415 | ClearPageChecked(page); | |
2416 | reiserfs_write_lock(s); | |
2417 | error = journal_begin(&th, s, bh_per_page + 1); | |
2418 | if (error) { | |
2419 | reiserfs_write_unlock(s); | |
2420 | goto fail; | |
2421 | } | |
2422 | reiserfs_update_inode_transaction(inode); | |
1da177e4 | 2423 | } |
bd4c625c LT |
2424 | /* now go through and lock any dirty buffers on the page */ |
2425 | do { | |
2426 | get_bh(bh); | |
2427 | if (!buffer_mapped(bh)) | |
2428 | continue; | |
2429 | if (buffer_mapped(bh) && bh->b_blocknr == 0) | |
2430 | continue; | |
2431 | ||
2432 | if (checked) { | |
2433 | reiserfs_prepare_for_journal(s, bh, 1); | |
2434 | journal_mark_dirty(&th, s, bh); | |
2435 | continue; | |
2436 | } | |
2437 | /* from this point on, we know the buffer is mapped to a | |
2438 | * real block and not a direct item | |
2439 | */ | |
2440 | if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) { | |
2441 | lock_buffer(bh); | |
2442 | } else { | |
ca5de404 | 2443 | if (!trylock_buffer(bh)) { |
bd4c625c LT |
2444 | redirty_page_for_writepage(wbc, page); |
2445 | continue; | |
2446 | } | |
2447 | } | |
2448 | if (test_clear_buffer_dirty(bh)) { | |
2449 | mark_buffer_async_write(bh); | |
2450 | } else { | |
2451 | unlock_buffer(bh); | |
2452 | } | |
2453 | } while ((bh = bh->b_this_page) != head); | |
2454 | ||
2455 | if (checked) { | |
2456 | error = journal_end(&th, s, bh_per_page + 1); | |
2457 | reiserfs_write_unlock(s); | |
2458 | if (error) | |
2459 | goto fail; | |
1da177e4 | 2460 | } |
bd4c625c LT |
2461 | BUG_ON(PageWriteback(page)); |
2462 | set_page_writeback(page); | |
2463 | unlock_page(page); | |
1da177e4 | 2464 | |
bd4c625c | 2465 | /* |
0222e657 | 2466 | * since any buffer might be the only dirty buffer on the page, |
bd4c625c LT |
2467 | * the first submit_bh can bring the page out of writeback. |
2468 | * be careful with the buffers. | |
1da177e4 | 2469 | */ |
1da177e4 | 2470 | do { |
bd4c625c LT |
2471 | struct buffer_head *next = bh->b_this_page; |
2472 | if (buffer_async_write(bh)) { | |
2473 | submit_bh(WRITE, bh); | |
2474 | nr++; | |
2475 | } | |
2476 | put_bh(bh); | |
2477 | bh = next; | |
2478 | } while (bh != head); | |
1da177e4 | 2479 | |
bd4c625c LT |
2480 | error = 0; |
2481 | done: | |
2482 | if (nr == 0) { | |
2483 | /* | |
2484 | * if this page only had a direct item, it is very possible for | |
0222e657 JM |
2485 | * no io to be required without there being an error. Or, |
2486 | * someone else could have locked them and sent them down the | |
bd4c625c LT |
2487 | * pipe without locking the page |
2488 | */ | |
2489 | bh = head; | |
2490 | do { | |
2491 | if (!buffer_uptodate(bh)) { | |
2492 | partial = 1; | |
2493 | break; | |
2494 | } | |
2495 | bh = bh->b_this_page; | |
2496 | } while (bh != head); | |
2497 | if (!partial) | |
2498 | SetPageUptodate(page); | |
2499 | end_page_writeback(page); | |
2500 | } | |
2501 | return error; | |
1da177e4 | 2502 | |
bd4c625c LT |
2503 | fail: |
2504 | /* catches various errors, we need to make sure any valid dirty blocks | |
0222e657 | 2505 | * get to the media. The page is currently locked and not marked for |
bd4c625c LT |
2506 | * writeback |
2507 | */ | |
2508 | ClearPageUptodate(page); | |
2509 | bh = head; | |
2510 | do { | |
2511 | get_bh(bh); | |
2512 | if (buffer_mapped(bh) && buffer_dirty(bh) && bh->b_blocknr) { | |
2513 | lock_buffer(bh); | |
2514 | mark_buffer_async_write(bh); | |
2515 | } else { | |
2516 | /* | |
2517 | * clear any dirty bits that might have come from getting | |
2518 | * attached to a dirty page | |
2519 | */ | |
2520 | clear_buffer_dirty(bh); | |
2521 | } | |
2522 | bh = bh->b_this_page; | |
2523 | } while (bh != head); | |
2524 | SetPageError(page); | |
2525 | BUG_ON(PageWriteback(page)); | |
2526 | set_page_writeback(page); | |
2527 | unlock_page(page); | |
2528 | do { | |
2529 | struct buffer_head *next = bh->b_this_page; | |
2530 | if (buffer_async_write(bh)) { | |
2531 | clear_buffer_dirty(bh); | |
2532 | submit_bh(WRITE, bh); | |
2533 | nr++; | |
2534 | } | |
2535 | put_bh(bh); | |
2536 | bh = next; | |
2537 | } while (bh != head); | |
2538 | goto done; | |
1da177e4 LT |
2539 | } |
2540 | ||
bd4c625c LT |
2541 | static int reiserfs_readpage(struct file *f, struct page *page) |
2542 | { | |
2543 | return block_read_full_page(page, reiserfs_get_block); | |
2544 | } | |
1da177e4 | 2545 | |
bd4c625c | 2546 | static int reiserfs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 | 2547 | { |
bd4c625c LT |
2548 | struct inode *inode = page->mapping->host; |
2549 | reiserfs_wait_on_write_block(inode->i_sb); | |
2550 | return reiserfs_write_full_page(page, wbc); | |
1da177e4 LT |
2551 | } |
2552 | ||
ec8e2f74 JK |
2553 | static void reiserfs_truncate_failed_write(struct inode *inode) |
2554 | { | |
2555 | truncate_inode_pages(inode->i_mapping, inode->i_size); | |
2556 | reiserfs_truncate_file(inode, 0); | |
2557 | } | |
2558 | ||
ba9d8cec VS |
2559 | static int reiserfs_write_begin(struct file *file, |
2560 | struct address_space *mapping, | |
2561 | loff_t pos, unsigned len, unsigned flags, | |
2562 | struct page **pagep, void **fsdata) | |
2563 | { | |
2564 | struct inode *inode; | |
2565 | struct page *page; | |
2566 | pgoff_t index; | |
2567 | int ret; | |
2568 | int old_ref = 0; | |
2569 | ||
f7557e8f VS |
2570 | inode = mapping->host; |
2571 | *fsdata = 0; | |
2572 | if (flags & AOP_FLAG_CONT_EXPAND && | |
2573 | (pos & (inode->i_sb->s_blocksize - 1)) == 0) { | |
2574 | pos ++; | |
2575 | *fsdata = (void *)(unsigned long)flags; | |
2576 | } | |
2577 | ||
ba9d8cec | 2578 | index = pos >> PAGE_CACHE_SHIFT; |
54566b2c | 2579 | page = grab_cache_page_write_begin(mapping, index, flags); |
ba9d8cec VS |
2580 | if (!page) |
2581 | return -ENOMEM; | |
2582 | *pagep = page; | |
2583 | ||
ba9d8cec VS |
2584 | reiserfs_wait_on_write_block(inode->i_sb); |
2585 | fix_tail_page_for_writing(page); | |
2586 | if (reiserfs_transaction_running(inode->i_sb)) { | |
2587 | struct reiserfs_transaction_handle *th; | |
2588 | th = (struct reiserfs_transaction_handle *)current-> | |
2589 | journal_info; | |
2590 | BUG_ON(!th->t_refcount); | |
2591 | BUG_ON(!th->t_trans_id); | |
2592 | old_ref = th->t_refcount; | |
2593 | th->t_refcount++; | |
2594 | } | |
6e1db88d | 2595 | ret = __block_write_begin(page, pos, len, reiserfs_get_block); |
ba9d8cec VS |
2596 | if (ret && reiserfs_transaction_running(inode->i_sb)) { |
2597 | struct reiserfs_transaction_handle *th = current->journal_info; | |
2598 | /* this gets a little ugly. If reiserfs_get_block returned an | |
2599 | * error and left a transacstion running, we've got to close it, | |
2600 | * and we've got to free handle if it was a persistent transaction. | |
2601 | * | |
2602 | * But, if we had nested into an existing transaction, we need | |
2603 | * to just drop the ref count on the handle. | |
2604 | * | |
2605 | * If old_ref == 0, the transaction is from reiserfs_get_block, | |
2606 | * and it was a persistent trans. Otherwise, it was nested above. | |
2607 | */ | |
2608 | if (th->t_refcount > old_ref) { | |
2609 | if (old_ref) | |
2610 | th->t_refcount--; | |
2611 | else { | |
2612 | int err; | |
2613 | reiserfs_write_lock(inode->i_sb); | |
2614 | err = reiserfs_end_persistent_transaction(th); | |
2615 | reiserfs_write_unlock(inode->i_sb); | |
2616 | if (err) | |
2617 | ret = err; | |
2618 | } | |
2619 | } | |
2620 | } | |
2621 | if (ret) { | |
2622 | unlock_page(page); | |
2623 | page_cache_release(page); | |
ec8e2f74 JK |
2624 | /* Truncate allocated blocks */ |
2625 | reiserfs_truncate_failed_write(inode); | |
ba9d8cec VS |
2626 | } |
2627 | return ret; | |
2628 | } | |
2629 | ||
2630 | int reiserfs_prepare_write(struct file *f, struct page *page, | |
2631 | unsigned from, unsigned to) | |
bd4c625c LT |
2632 | { |
2633 | struct inode *inode = page->mapping->host; | |
2634 | int ret; | |
2635 | int old_ref = 0; | |
2636 | ||
8ebc4232 | 2637 | reiserfs_write_unlock(inode->i_sb); |
bd4c625c | 2638 | reiserfs_wait_on_write_block(inode->i_sb); |
8ebc4232 FW |
2639 | reiserfs_write_lock(inode->i_sb); |
2640 | ||
bd4c625c LT |
2641 | fix_tail_page_for_writing(page); |
2642 | if (reiserfs_transaction_running(inode->i_sb)) { | |
2643 | struct reiserfs_transaction_handle *th; | |
2644 | th = (struct reiserfs_transaction_handle *)current-> | |
2645 | journal_info; | |
2646 | BUG_ON(!th->t_refcount); | |
2647 | BUG_ON(!th->t_trans_id); | |
2648 | old_ref = th->t_refcount; | |
2649 | th->t_refcount++; | |
1da177e4 | 2650 | } |
1da177e4 | 2651 | |
bd4c625c LT |
2652 | ret = block_prepare_write(page, from, to, reiserfs_get_block); |
2653 | if (ret && reiserfs_transaction_running(inode->i_sb)) { | |
2654 | struct reiserfs_transaction_handle *th = current->journal_info; | |
2655 | /* this gets a little ugly. If reiserfs_get_block returned an | |
2656 | * error and left a transacstion running, we've got to close it, | |
2657 | * and we've got to free handle if it was a persistent transaction. | |
2658 | * | |
2659 | * But, if we had nested into an existing transaction, we need | |
2660 | * to just drop the ref count on the handle. | |
2661 | * | |
2662 | * If old_ref == 0, the transaction is from reiserfs_get_block, | |
2663 | * and it was a persistent trans. Otherwise, it was nested above. | |
2664 | */ | |
2665 | if (th->t_refcount > old_ref) { | |
2666 | if (old_ref) | |
2667 | th->t_refcount--; | |
2668 | else { | |
2669 | int err; | |
2670 | reiserfs_write_lock(inode->i_sb); | |
2671 | err = reiserfs_end_persistent_transaction(th); | |
2672 | reiserfs_write_unlock(inode->i_sb); | |
2673 | if (err) | |
2674 | ret = err; | |
2675 | } | |
2676 | } | |
2677 | } | |
2678 | return ret; | |
1da177e4 | 2679 | |
bd4c625c | 2680 | } |
1da177e4 | 2681 | |
bd4c625c LT |
2682 | static sector_t reiserfs_aop_bmap(struct address_space *as, sector_t block) |
2683 | { | |
2684 | return generic_block_bmap(as, block, reiserfs_bmap); | |
1da177e4 LT |
2685 | } |
2686 | ||
ba9d8cec VS |
2687 | static int reiserfs_write_end(struct file *file, struct address_space *mapping, |
2688 | loff_t pos, unsigned len, unsigned copied, | |
2689 | struct page *page, void *fsdata) | |
2690 | { | |
2691 | struct inode *inode = page->mapping->host; | |
2692 | int ret = 0; | |
2693 | int update_sd = 0; | |
2694 | struct reiserfs_transaction_handle *th; | |
2695 | unsigned start; | |
d6f5b0aa FW |
2696 | int lock_depth = 0; |
2697 | bool locked = false; | |
ba9d8cec | 2698 | |
f7557e8f VS |
2699 | if ((unsigned long)fsdata & AOP_FLAG_CONT_EXPAND) |
2700 | pos ++; | |
ba9d8cec VS |
2701 | |
2702 | reiserfs_wait_on_write_block(inode->i_sb); | |
2703 | if (reiserfs_transaction_running(inode->i_sb)) | |
2704 | th = current->journal_info; | |
2705 | else | |
2706 | th = NULL; | |
2707 | ||
2708 | start = pos & (PAGE_CACHE_SIZE - 1); | |
2709 | if (unlikely(copied < len)) { | |
2710 | if (!PageUptodate(page)) | |
2711 | copied = 0; | |
2712 | ||
2713 | page_zero_new_buffers(page, start + copied, start + len); | |
2714 | } | |
2715 | flush_dcache_page(page); | |
2716 | ||
2717 | reiserfs_commit_page(inode, page, start, start + copied); | |
2718 | ||
2719 | /* generic_commit_write does this for us, but does not update the | |
2720 | ** transaction tracking stuff when the size changes. So, we have | |
2721 | ** to do the i_size updates here. | |
2722 | */ | |
ec8e2f74 | 2723 | if (pos + copied > inode->i_size) { |
ba9d8cec | 2724 | struct reiserfs_transaction_handle myth; |
d6f5b0aa FW |
2725 | lock_depth = reiserfs_write_lock_once(inode->i_sb); |
2726 | locked = true; | |
ba9d8cec VS |
2727 | /* If the file have grown beyond the border where it |
2728 | can have a tail, unmark it as needing a tail | |
2729 | packing */ | |
2730 | if ((have_large_tails(inode->i_sb) | |
2731 | && inode->i_size > i_block_size(inode) * 4) | |
2732 | || (have_small_tails(inode->i_sb) | |
2733 | && inode->i_size > i_block_size(inode))) | |
2734 | REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask; | |
2735 | ||
2736 | ret = journal_begin(&myth, inode->i_sb, 1); | |
d6f5b0aa | 2737 | if (ret) |
ba9d8cec | 2738 | goto journal_error; |
d6f5b0aa | 2739 | |
ba9d8cec | 2740 | reiserfs_update_inode_transaction(inode); |
ec8e2f74 | 2741 | inode->i_size = pos + copied; |
ba9d8cec VS |
2742 | /* |
2743 | * this will just nest into our transaction. It's important | |
2744 | * to use mark_inode_dirty so the inode gets pushed around on the | |
2745 | * dirty lists, and so that O_SYNC works as expected | |
2746 | */ | |
2747 | mark_inode_dirty(inode); | |
2748 | reiserfs_update_sd(&myth, inode); | |
2749 | update_sd = 1; | |
2750 | ret = journal_end(&myth, inode->i_sb, 1); | |
ba9d8cec VS |
2751 | if (ret) |
2752 | goto journal_error; | |
2753 | } | |
2754 | if (th) { | |
d6f5b0aa FW |
2755 | if (!locked) { |
2756 | lock_depth = reiserfs_write_lock_once(inode->i_sb); | |
2757 | locked = true; | |
2758 | } | |
ba9d8cec VS |
2759 | if (!update_sd) |
2760 | mark_inode_dirty(inode); | |
2761 | ret = reiserfs_end_persistent_transaction(th); | |
ba9d8cec VS |
2762 | if (ret) |
2763 | goto out; | |
2764 | } | |
2765 | ||
2766 | out: | |
d6f5b0aa FW |
2767 | if (locked) |
2768 | reiserfs_write_unlock_once(inode->i_sb, lock_depth); | |
ba9d8cec VS |
2769 | unlock_page(page); |
2770 | page_cache_release(page); | |
ec8e2f74 JK |
2771 | |
2772 | if (pos + len > inode->i_size) | |
2773 | reiserfs_truncate_failed_write(inode); | |
2774 | ||
ba9d8cec VS |
2775 | return ret == 0 ? copied : ret; |
2776 | ||
2777 | journal_error: | |
d6f5b0aa FW |
2778 | reiserfs_write_unlock_once(inode->i_sb, lock_depth); |
2779 | locked = false; | |
ba9d8cec | 2780 | if (th) { |
ba9d8cec VS |
2781 | if (!update_sd) |
2782 | reiserfs_update_sd(th, inode); | |
2783 | ret = reiserfs_end_persistent_transaction(th); | |
ba9d8cec | 2784 | } |
ba9d8cec VS |
2785 | goto out; |
2786 | } | |
2787 | ||
2788 | int reiserfs_commit_write(struct file *f, struct page *page, | |
2789 | unsigned from, unsigned to) | |
bd4c625c LT |
2790 | { |
2791 | struct inode *inode = page->mapping->host; | |
2792 | loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + to; | |
2793 | int ret = 0; | |
2794 | int update_sd = 0; | |
2795 | struct reiserfs_transaction_handle *th = NULL; | |
2796 | ||
8ebc4232 | 2797 | reiserfs_write_unlock(inode->i_sb); |
bd4c625c | 2798 | reiserfs_wait_on_write_block(inode->i_sb); |
8ebc4232 FW |
2799 | reiserfs_write_lock(inode->i_sb); |
2800 | ||
bd4c625c LT |
2801 | if (reiserfs_transaction_running(inode->i_sb)) { |
2802 | th = current->journal_info; | |
2803 | } | |
2804 | reiserfs_commit_page(inode, page, from, to); | |
1da177e4 | 2805 | |
bd4c625c LT |
2806 | /* generic_commit_write does this for us, but does not update the |
2807 | ** transaction tracking stuff when the size changes. So, we have | |
2808 | ** to do the i_size updates here. | |
2809 | */ | |
2810 | if (pos > inode->i_size) { | |
2811 | struct reiserfs_transaction_handle myth; | |
bd4c625c LT |
2812 | /* If the file have grown beyond the border where it |
2813 | can have a tail, unmark it as needing a tail | |
2814 | packing */ | |
2815 | if ((have_large_tails(inode->i_sb) | |
2816 | && inode->i_size > i_block_size(inode) * 4) | |
2817 | || (have_small_tails(inode->i_sb) | |
2818 | && inode->i_size > i_block_size(inode))) | |
2819 | REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask; | |
2820 | ||
2821 | ret = journal_begin(&myth, inode->i_sb, 1); | |
7e942770 | 2822 | if (ret) |
bd4c625c | 2823 | goto journal_error; |
7e942770 | 2824 | |
bd4c625c LT |
2825 | reiserfs_update_inode_transaction(inode); |
2826 | inode->i_size = pos; | |
9f03783c CM |
2827 | /* |
2828 | * this will just nest into our transaction. It's important | |
2829 | * to use mark_inode_dirty so the inode gets pushed around on the | |
2830 | * dirty lists, and so that O_SYNC works as expected | |
2831 | */ | |
2832 | mark_inode_dirty(inode); | |
bd4c625c LT |
2833 | reiserfs_update_sd(&myth, inode); |
2834 | update_sd = 1; | |
2835 | ret = journal_end(&myth, inode->i_sb, 1); | |
bd4c625c LT |
2836 | if (ret) |
2837 | goto journal_error; | |
2838 | } | |
2839 | if (th) { | |
bd4c625c | 2840 | if (!update_sd) |
9f03783c | 2841 | mark_inode_dirty(inode); |
bd4c625c | 2842 | ret = reiserfs_end_persistent_transaction(th); |
bd4c625c LT |
2843 | if (ret) |
2844 | goto out; | |
2845 | } | |
2846 | ||
bd4c625c LT |
2847 | out: |
2848 | return ret; | |
1da177e4 | 2849 | |
bd4c625c LT |
2850 | journal_error: |
2851 | if (th) { | |
bd4c625c LT |
2852 | if (!update_sd) |
2853 | reiserfs_update_sd(th, inode); | |
2854 | ret = reiserfs_end_persistent_transaction(th); | |
bd4c625c LT |
2855 | } |
2856 | ||
2857 | return ret; | |
1da177e4 LT |
2858 | } |
2859 | ||
bd4c625c | 2860 | void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode) |
1da177e4 | 2861 | { |
bd4c625c LT |
2862 | if (reiserfs_attrs(inode->i_sb)) { |
2863 | if (sd_attrs & REISERFS_SYNC_FL) | |
2864 | inode->i_flags |= S_SYNC; | |
1da177e4 | 2865 | else |
bd4c625c LT |
2866 | inode->i_flags &= ~S_SYNC; |
2867 | if (sd_attrs & REISERFS_IMMUTABLE_FL) | |
2868 | inode->i_flags |= S_IMMUTABLE; | |
1da177e4 | 2869 | else |
bd4c625c LT |
2870 | inode->i_flags &= ~S_IMMUTABLE; |
2871 | if (sd_attrs & REISERFS_APPEND_FL) | |
2872 | inode->i_flags |= S_APPEND; | |
1da177e4 | 2873 | else |
bd4c625c LT |
2874 | inode->i_flags &= ~S_APPEND; |
2875 | if (sd_attrs & REISERFS_NOATIME_FL) | |
2876 | inode->i_flags |= S_NOATIME; | |
1da177e4 | 2877 | else |
bd4c625c LT |
2878 | inode->i_flags &= ~S_NOATIME; |
2879 | if (sd_attrs & REISERFS_NOTAIL_FL) | |
1da177e4 LT |
2880 | REISERFS_I(inode)->i_flags |= i_nopack_mask; |
2881 | else | |
2882 | REISERFS_I(inode)->i_flags &= ~i_nopack_mask; | |
2883 | } | |
2884 | } | |
2885 | ||
bd4c625c | 2886 | void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs) |
1da177e4 | 2887 | { |
bd4c625c LT |
2888 | if (reiserfs_attrs(inode->i_sb)) { |
2889 | if (inode->i_flags & S_IMMUTABLE) | |
1da177e4 LT |
2890 | *sd_attrs |= REISERFS_IMMUTABLE_FL; |
2891 | else | |
2892 | *sd_attrs &= ~REISERFS_IMMUTABLE_FL; | |
bd4c625c | 2893 | if (inode->i_flags & S_SYNC) |
1da177e4 LT |
2894 | *sd_attrs |= REISERFS_SYNC_FL; |
2895 | else | |
2896 | *sd_attrs &= ~REISERFS_SYNC_FL; | |
bd4c625c | 2897 | if (inode->i_flags & S_NOATIME) |
1da177e4 LT |
2898 | *sd_attrs |= REISERFS_NOATIME_FL; |
2899 | else | |
2900 | *sd_attrs &= ~REISERFS_NOATIME_FL; | |
bd4c625c | 2901 | if (REISERFS_I(inode)->i_flags & i_nopack_mask) |
1da177e4 LT |
2902 | *sd_attrs |= REISERFS_NOTAIL_FL; |
2903 | else | |
2904 | *sd_attrs &= ~REISERFS_NOTAIL_FL; | |
2905 | } | |
2906 | } | |
2907 | ||
2908 | /* decide if this buffer needs to stay around for data logging or ordered | |
2909 | ** write purposes | |
2910 | */ | |
2911 | static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh) | |
2912 | { | |
bd4c625c LT |
2913 | int ret = 1; |
2914 | struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb); | |
2915 | ||
d62b1b87 | 2916 | lock_buffer(bh); |
bd4c625c LT |
2917 | spin_lock(&j->j_dirty_buffers_lock); |
2918 | if (!buffer_mapped(bh)) { | |
2919 | goto free_jh; | |
2920 | } | |
2921 | /* the page is locked, and the only places that log a data buffer | |
2922 | * also lock the page. | |
1da177e4 | 2923 | */ |
bd4c625c LT |
2924 | if (reiserfs_file_data_log(inode)) { |
2925 | /* | |
2926 | * very conservative, leave the buffer pinned if | |
2927 | * anyone might need it. | |
2928 | */ | |
2929 | if (buffer_journaled(bh) || buffer_journal_dirty(bh)) { | |
2930 | ret = 0; | |
2931 | } | |
d62b1b87 | 2932 | } else if (buffer_dirty(bh)) { |
bd4c625c LT |
2933 | struct reiserfs_journal_list *jl; |
2934 | struct reiserfs_jh *jh = bh->b_private; | |
2935 | ||
2936 | /* why is this safe? | |
2937 | * reiserfs_setattr updates i_size in the on disk | |
2938 | * stat data before allowing vmtruncate to be called. | |
2939 | * | |
2940 | * If buffer was put onto the ordered list for this | |
2941 | * transaction, we know for sure either this transaction | |
2942 | * or an older one already has updated i_size on disk, | |
2943 | * and this ordered data won't be referenced in the file | |
2944 | * if we crash. | |
2945 | * | |
2946 | * if the buffer was put onto the ordered list for an older | |
2947 | * transaction, we need to leave it around | |
2948 | */ | |
2949 | if (jh && (jl = jh->jl) | |
2950 | && jl != SB_JOURNAL(inode->i_sb)->j_current_jl) | |
2951 | ret = 0; | |
2952 | } | |
2953 | free_jh: | |
2954 | if (ret && bh->b_private) { | |
2955 | reiserfs_free_jh(bh); | |
2956 | } | |
2957 | spin_unlock(&j->j_dirty_buffers_lock); | |
d62b1b87 | 2958 | unlock_buffer(bh); |
bd4c625c | 2959 | return ret; |
1da177e4 LT |
2960 | } |
2961 | ||
2962 | /* clm -- taken from fs/buffer.c:block_invalidate_page */ | |
2ff28e22 | 2963 | static void reiserfs_invalidatepage(struct page *page, unsigned long offset) |
1da177e4 | 2964 | { |
bd4c625c LT |
2965 | struct buffer_head *head, *bh, *next; |
2966 | struct inode *inode = page->mapping->host; | |
2967 | unsigned int curr_off = 0; | |
2968 | int ret = 1; | |
1da177e4 | 2969 | |
bd4c625c | 2970 | BUG_ON(!PageLocked(page)); |
1da177e4 | 2971 | |
bd4c625c LT |
2972 | if (offset == 0) |
2973 | ClearPageChecked(page); | |
1da177e4 | 2974 | |
bd4c625c LT |
2975 | if (!page_has_buffers(page)) |
2976 | goto out; | |
2977 | ||
2978 | head = page_buffers(page); | |
2979 | bh = head; | |
2980 | do { | |
2981 | unsigned int next_off = curr_off + bh->b_size; | |
2982 | next = bh->b_this_page; | |
1da177e4 | 2983 | |
bd4c625c LT |
2984 | /* |
2985 | * is this block fully invalidated? | |
2986 | */ | |
2987 | if (offset <= curr_off) { | |
2988 | if (invalidatepage_can_drop(inode, bh)) | |
2989 | reiserfs_unmap_buffer(bh); | |
2990 | else | |
2991 | ret = 0; | |
2992 | } | |
2993 | curr_off = next_off; | |
2994 | bh = next; | |
2995 | } while (bh != head); | |
1da177e4 LT |
2996 | |
2997 | /* | |
bd4c625c LT |
2998 | * We release buffers only if the entire page is being invalidated. |
2999 | * The get_block cached value has been unconditionally invalidated, | |
3000 | * so real IO is not possible anymore. | |
1da177e4 | 3001 | */ |
2ff28e22 | 3002 | if (!offset && ret) { |
bd4c625c | 3003 | ret = try_to_release_page(page, 0); |
2ff28e22 N |
3004 | /* maybe should BUG_ON(!ret); - neilb */ |
3005 | } | |
bd4c625c | 3006 | out: |
2ff28e22 | 3007 | return; |
1da177e4 LT |
3008 | } |
3009 | ||
bd4c625c LT |
3010 | static int reiserfs_set_page_dirty(struct page *page) |
3011 | { | |
3012 | struct inode *inode = page->mapping->host; | |
3013 | if (reiserfs_file_data_log(inode)) { | |
3014 | SetPageChecked(page); | |
3015 | return __set_page_dirty_nobuffers(page); | |
3016 | } | |
3017 | return __set_page_dirty_buffers(page); | |
1da177e4 LT |
3018 | } |
3019 | ||
3020 | /* | |
3021 | * Returns 1 if the page's buffers were dropped. The page is locked. | |
3022 | * | |
3023 | * Takes j_dirty_buffers_lock to protect the b_assoc_buffers list_heads | |
3024 | * in the buffers at page_buffers(page). | |
3025 | * | |
3026 | * even in -o notail mode, we can't be sure an old mount without -o notail | |
3027 | * didn't create files with tails. | |
3028 | */ | |
27496a8c | 3029 | static int reiserfs_releasepage(struct page *page, gfp_t unused_gfp_flags) |
1da177e4 | 3030 | { |
bd4c625c LT |
3031 | struct inode *inode = page->mapping->host; |
3032 | struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb); | |
3033 | struct buffer_head *head; | |
3034 | struct buffer_head *bh; | |
3035 | int ret = 1; | |
3036 | ||
3037 | WARN_ON(PageChecked(page)); | |
3038 | spin_lock(&j->j_dirty_buffers_lock); | |
3039 | head = page_buffers(page); | |
3040 | bh = head; | |
3041 | do { | |
3042 | if (bh->b_private) { | |
3043 | if (!buffer_dirty(bh) && !buffer_locked(bh)) { | |
3044 | reiserfs_free_jh(bh); | |
3045 | } else { | |
3046 | ret = 0; | |
3047 | break; | |
3048 | } | |
3049 | } | |
3050 | bh = bh->b_this_page; | |
3051 | } while (bh != head); | |
3052 | if (ret) | |
3053 | ret = try_to_free_buffers(page); | |
3054 | spin_unlock(&j->j_dirty_buffers_lock); | |
3055 | return ret; | |
1da177e4 LT |
3056 | } |
3057 | ||
3058 | /* We thank Mingming Cao for helping us understand in great detail what | |
3059 | to do in this section of the code. */ | |
3060 | static ssize_t reiserfs_direct_IO(int rw, struct kiocb *iocb, | |
bd4c625c LT |
3061 | const struct iovec *iov, loff_t offset, |
3062 | unsigned long nr_segs) | |
1da177e4 | 3063 | { |
bd4c625c LT |
3064 | struct file *file = iocb->ki_filp; |
3065 | struct inode *inode = file->f_mapping->host; | |
eafdc7d1 | 3066 | ssize_t ret; |
1da177e4 | 3067 | |
eafdc7d1 | 3068 | ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, |
bd4c625c LT |
3069 | offset, nr_segs, |
3070 | reiserfs_get_blocks_direct_io, NULL); | |
eafdc7d1 CH |
3071 | |
3072 | /* | |
3073 | * In case of error extending write may have instantiated a few | |
3074 | * blocks outside i_size. Trim these off again. | |
3075 | */ | |
3076 | if (unlikely((rw & WRITE) && ret < 0)) { | |
3077 | loff_t isize = i_size_read(inode); | |
3078 | loff_t end = offset + iov_length(iov, nr_segs); | |
3079 | ||
3080 | if (end > isize) | |
3081 | vmtruncate(inode, isize); | |
3082 | } | |
3083 | ||
3084 | return ret; | |
1da177e4 LT |
3085 | } |
3086 | ||
bd4c625c LT |
3087 | int reiserfs_setattr(struct dentry *dentry, struct iattr *attr) |
3088 | { | |
3089 | struct inode *inode = dentry->d_inode; | |
cdd6fe6e | 3090 | unsigned int ia_valid; |
5fe1533f FW |
3091 | int depth; |
3092 | int error; | |
cdd6fe6e | 3093 | |
db78b877 CH |
3094 | error = inode_change_ok(inode, attr); |
3095 | if (error) | |
3096 | return error; | |
3097 | ||
cdd6fe6e JL |
3098 | /* must be turned off for recursive notify_change calls */ |
3099 | ia_valid = attr->ia_valid &= ~(ATTR_KILL_SUID|ATTR_KILL_SGID); | |
3100 | ||
5fe1533f | 3101 | depth = reiserfs_write_lock_once(inode->i_sb); |
12755627 | 3102 | if (is_quota_modification(inode, attr)) |
871a2931 | 3103 | dquot_initialize(inode); |
907f4554 | 3104 | |
12755627 | 3105 | if (attr->ia_valid & ATTR_SIZE) { |
bd4c625c LT |
3106 | /* version 2 items will be caught by the s_maxbytes check |
3107 | ** done for us in vmtruncate | |
3108 | */ | |
3109 | if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 && | |
3110 | attr->ia_size > MAX_NON_LFS) { | |
3111 | error = -EFBIG; | |
3112 | goto out; | |
3113 | } | |
3114 | /* fill in hole pointers in the expanding truncate case. */ | |
3115 | if (attr->ia_size > inode->i_size) { | |
f7557e8f | 3116 | error = generic_cont_expand_simple(inode, attr->ia_size); |
bd4c625c LT |
3117 | if (REISERFS_I(inode)->i_prealloc_count > 0) { |
3118 | int err; | |
3119 | struct reiserfs_transaction_handle th; | |
3120 | /* we're changing at most 2 bitmaps, inode + super */ | |
3121 | err = journal_begin(&th, inode->i_sb, 4); | |
3122 | if (!err) { | |
3123 | reiserfs_discard_prealloc(&th, inode); | |
3124 | err = journal_end(&th, inode->i_sb, 4); | |
3125 | } | |
3126 | if (err) | |
3127 | error = err; | |
3128 | } | |
3129 | if (error) | |
3130 | goto out; | |
dd535a59 VS |
3131 | /* |
3132 | * file size is changed, ctime and mtime are | |
3133 | * to be updated | |
3134 | */ | |
3135 | attr->ia_valid |= (ATTR_MTIME | ATTR_CTIME); | |
1da177e4 | 3136 | } |
1da177e4 | 3137 | } |
1da177e4 | 3138 | |
bd4c625c LT |
3139 | if ((((attr->ia_valid & ATTR_UID) && (attr->ia_uid & ~0xffff)) || |
3140 | ((attr->ia_valid & ATTR_GID) && (attr->ia_gid & ~0xffff))) && | |
3141 | (get_inode_sd_version(inode) == STAT_DATA_V1)) { | |
1da177e4 | 3142 | /* stat data of format v3.5 has 16 bit uid and gid */ |
bd4c625c LT |
3143 | error = -EINVAL; |
3144 | goto out; | |
3145 | } | |
1da177e4 | 3146 | |
1025774c CH |
3147 | if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) || |
3148 | (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) { | |
3149 | struct reiserfs_transaction_handle th; | |
3150 | int jbegin_count = | |
3151 | 2 * | |
3152 | (REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb) + | |
3153 | REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb)) + | |
3154 | 2; | |
bd4c625c | 3155 | |
1025774c CH |
3156 | error = reiserfs_chown_xattrs(inode, attr); |
3157 | ||
3158 | if (error) | |
3159 | return error; | |
3160 | ||
3161 | /* (user+group)*(old+new) structure - we count quota info and , inode write (sb, inode) */ | |
3162 | error = journal_begin(&th, inode->i_sb, jbegin_count); | |
3163 | if (error) | |
3164 | goto out; | |
3165 | error = dquot_transfer(inode, attr); | |
3166 | if (error) { | |
3167 | journal_end(&th, inode->i_sb, jbegin_count); | |
3168 | goto out; | |
108d3943 | 3169 | } |
1025774c CH |
3170 | |
3171 | /* Update corresponding info in inode so that everything is in | |
3172 | * one transaction */ | |
3173 | if (attr->ia_valid & ATTR_UID) | |
3174 | inode->i_uid = attr->ia_uid; | |
3175 | if (attr->ia_valid & ATTR_GID) | |
3176 | inode->i_gid = attr->ia_gid; | |
3177 | mark_inode_dirty(inode); | |
3178 | error = journal_end(&th, inode->i_sb, jbegin_count); | |
3179 | if (error) | |
3180 | goto out; | |
bd4c625c | 3181 | } |
1da177e4 | 3182 | |
1025774c CH |
3183 | /* |
3184 | * Relax the lock here, as it might truncate the | |
3185 | * inode pages and wait for inode pages locks. | |
3186 | * To release such page lock, the owner needs the | |
3187 | * reiserfs lock | |
3188 | */ | |
3189 | reiserfs_write_unlock_once(inode->i_sb, depth); | |
3190 | if ((attr->ia_valid & ATTR_SIZE) && | |
3191 | attr->ia_size != i_size_read(inode)) | |
3192 | error = vmtruncate(inode, attr->ia_size); | |
3193 | ||
3194 | if (!error) { | |
3195 | setattr_copy(inode, attr); | |
3196 | mark_inode_dirty(inode); | |
bd4c625c | 3197 | } |
1025774c | 3198 | depth = reiserfs_write_lock_once(inode->i_sb); |
1da177e4 | 3199 | |
bd4c625c LT |
3200 | if (!error && reiserfs_posixacl(inode->i_sb)) { |
3201 | if (attr->ia_valid & ATTR_MODE) | |
3202 | error = reiserfs_acl_chmod(inode); | |
3203 | } | |
1da177e4 | 3204 | |
bd4c625c | 3205 | out: |
5fe1533f FW |
3206 | reiserfs_write_unlock_once(inode->i_sb, depth); |
3207 | ||
bd4c625c | 3208 | return error; |
1da177e4 LT |
3209 | } |
3210 | ||
f5e54d6e | 3211 | const struct address_space_operations reiserfs_address_space_operations = { |
bd4c625c LT |
3212 | .writepage = reiserfs_writepage, |
3213 | .readpage = reiserfs_readpage, | |
3214 | .readpages = reiserfs_readpages, | |
3215 | .releasepage = reiserfs_releasepage, | |
3216 | .invalidatepage = reiserfs_invalidatepage, | |
3217 | .sync_page = block_sync_page, | |
ba9d8cec VS |
3218 | .write_begin = reiserfs_write_begin, |
3219 | .write_end = reiserfs_write_end, | |
bd4c625c LT |
3220 | .bmap = reiserfs_aop_bmap, |
3221 | .direct_IO = reiserfs_direct_IO, | |
3222 | .set_page_dirty = reiserfs_set_page_dirty, | |
3223 | }; |