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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 | ||
5 | #include <linux/config.h> | |
6 | #include <linux/time.h> | |
7 | #include <linux/fs.h> | |
8 | #include <linux/reiserfs_fs.h> | |
9 | #include <linux/reiserfs_acl.h> | |
10 | #include <linux/reiserfs_xattr.h> | |
11 | #include <linux/smp_lock.h> | |
12 | #include <linux/pagemap.h> | |
13 | #include <linux/highmem.h> | |
14 | #include <asm/uaccess.h> | |
15 | #include <asm/unaligned.h> | |
16 | #include <linux/buffer_head.h> | |
17 | #include <linux/mpage.h> | |
18 | #include <linux/writeback.h> | |
19 | #include <linux/quotaops.h> | |
20 | ||
bd4c625c | 21 | extern int reiserfs_default_io_size; /* default io size devuned in super.c */ |
1da177e4 LT |
22 | |
23 | static int reiserfs_commit_write(struct file *f, struct page *page, | |
bd4c625c | 24 | unsigned from, unsigned to); |
1da177e4 LT |
25 | static int reiserfs_prepare_write(struct file *f, struct page *page, |
26 | unsigned from, unsigned to); | |
27 | ||
bd4c625c | 28 | void reiserfs_delete_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; | |
24996049 | 35 | int err; |
1da177e4 | 36 | |
fef26658 MF |
37 | truncate_inode_pages(&inode->i_data, 0); |
38 | ||
bd4c625c | 39 | reiserfs_write_lock(inode->i_sb); |
1da177e4 | 40 | |
bd4c625c LT |
41 | /* The = 0 happens when we abort creating a new inode for some reason like lack of space.. */ |
42 | if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) { /* also handles bad_inode case */ | |
1b1dcc1b | 43 | mutex_lock(&inode->i_mutex); |
1da177e4 | 44 | |
bd4c625c | 45 | reiserfs_delete_xattrs(inode); |
1da177e4 | 46 | |
bd4c625c | 47 | if (journal_begin(&th, inode->i_sb, jbegin_count)) { |
1b1dcc1b | 48 | mutex_unlock(&inode->i_mutex); |
bd4c625c LT |
49 | goto out; |
50 | } | |
51 | reiserfs_update_inode_transaction(inode); | |
1da177e4 | 52 | |
24996049 | 53 | err = reiserfs_delete_object(&th, inode); |
1da177e4 | 54 | |
bd4c625c LT |
55 | /* Do quota update inside a transaction for journaled quotas. We must do that |
56 | * after delete_object so that quota updates go into the same transaction as | |
57 | * stat data deletion */ | |
24996049 JM |
58 | if (!err) |
59 | DQUOT_FREE_INODE(inode); | |
bd4c625c LT |
60 | |
61 | if (journal_end(&th, inode->i_sb, jbegin_count)) { | |
1b1dcc1b | 62 | mutex_unlock(&inode->i_mutex); |
bd4c625c LT |
63 | goto out; |
64 | } | |
1da177e4 | 65 | |
1b1dcc1b | 66 | mutex_unlock(&inode->i_mutex); |
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: | |
82 | clear_inode(inode); /* note this must go after the journal_end to prevent deadlock */ | |
83 | inode->i_blocks = 0; | |
84 | reiserfs_write_unlock(inode->i_sb); | |
1da177e4 LT |
85 | } |
86 | ||
bd4c625c LT |
87 | static void _make_cpu_key(struct cpu_key *key, int version, __u32 dirid, |
88 | __u32 objectid, loff_t offset, int type, int length) | |
1da177e4 | 89 | { |
bd4c625c | 90 | key->version = version; |
1da177e4 | 91 | |
bd4c625c LT |
92 | key->on_disk_key.k_dir_id = dirid; |
93 | key->on_disk_key.k_objectid = objectid; | |
94 | set_cpu_key_k_offset(key, offset); | |
95 | set_cpu_key_k_type(key, type); | |
96 | key->key_length = length; | |
1da177e4 LT |
97 | } |
98 | ||
1da177e4 LT |
99 | /* take base of inode_key (it comes from inode always) (dirid, objectid) and version from an inode, set |
100 | offset and type of key */ | |
bd4c625c LT |
101 | void make_cpu_key(struct cpu_key *key, struct inode *inode, loff_t offset, |
102 | int type, int length) | |
1da177e4 | 103 | { |
bd4c625c LT |
104 | _make_cpu_key(key, get_inode_item_key_version(inode), |
105 | le32_to_cpu(INODE_PKEY(inode)->k_dir_id), | |
106 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), offset, type, | |
107 | length); | |
1da177e4 LT |
108 | } |
109 | ||
1da177e4 LT |
110 | // |
111 | // when key is 0, do not set version and short key | |
112 | // | |
bd4c625c LT |
113 | inline void make_le_item_head(struct item_head *ih, const struct cpu_key *key, |
114 | int version, | |
115 | loff_t offset, int type, int length, | |
116 | int entry_count /*or ih_free_space */ ) | |
1da177e4 | 117 | { |
bd4c625c LT |
118 | if (key) { |
119 | ih->ih_key.k_dir_id = cpu_to_le32(key->on_disk_key.k_dir_id); | |
120 | ih->ih_key.k_objectid = | |
121 | cpu_to_le32(key->on_disk_key.k_objectid); | |
122 | } | |
123 | put_ih_version(ih, version); | |
124 | set_le_ih_k_offset(ih, offset); | |
125 | set_le_ih_k_type(ih, type); | |
126 | put_ih_item_len(ih, length); | |
127 | /* set_ih_free_space (ih, 0); */ | |
128 | // for directory items it is entry count, for directs and stat | |
129 | // datas - 0xffff, for indirects - 0 | |
130 | put_ih_entry_count(ih, entry_count); | |
1da177e4 LT |
131 | } |
132 | ||
133 | // | |
134 | // FIXME: we might cache recently accessed indirect item | |
135 | ||
136 | // Ugh. Not too eager for that.... | |
137 | // I cut the code until such time as I see a convincing argument (benchmark). | |
138 | // I don't want a bloated inode struct..., and I don't like code complexity.... | |
139 | ||
140 | /* cutting the code is fine, since it really isn't in use yet and is easy | |
141 | ** to add back in. But, Vladimir has a really good idea here. Think | |
142 | ** about what happens for reading a file. For each page, | |
143 | ** The VFS layer calls reiserfs_readpage, who searches the tree to find | |
144 | ** an indirect item. This indirect item has X number of pointers, where | |
145 | ** X is a big number if we've done the block allocation right. But, | |
146 | ** we only use one or two of these pointers during each call to readpage, | |
147 | ** needlessly researching again later on. | |
148 | ** | |
149 | ** The size of the cache could be dynamic based on the size of the file. | |
150 | ** | |
151 | ** I'd also like to see us cache the location the stat data item, since | |
152 | ** we are needlessly researching for that frequently. | |
153 | ** | |
154 | ** --chris | |
155 | */ | |
156 | ||
157 | /* If this page has a file tail in it, and | |
158 | ** it was read in by get_block_create_0, the page data is valid, | |
159 | ** but tail is still sitting in a direct item, and we can't write to | |
160 | ** it. So, look through this page, and check all the mapped buffers | |
161 | ** to make sure they have valid block numbers. Any that don't need | |
162 | ** to be unmapped, so that block_prepare_write will correctly call | |
163 | ** reiserfs_get_block to convert the tail into an unformatted node | |
164 | */ | |
bd4c625c LT |
165 | static inline void fix_tail_page_for_writing(struct page *page) |
166 | { | |
167 | struct buffer_head *head, *next, *bh; | |
168 | ||
169 | if (page && page_has_buffers(page)) { | |
170 | head = page_buffers(page); | |
171 | bh = head; | |
172 | do { | |
173 | next = bh->b_this_page; | |
174 | if (buffer_mapped(bh) && bh->b_blocknr == 0) { | |
175 | reiserfs_unmap_buffer(bh); | |
176 | } | |
177 | bh = next; | |
178 | } while (bh != head); | |
179 | } | |
1da177e4 LT |
180 | } |
181 | ||
182 | /* reiserfs_get_block does not need to allocate a block only if it has been | |
183 | done already or non-hole position has been found in the indirect item */ | |
bd4c625c LT |
184 | static inline int allocation_needed(int retval, b_blocknr_t allocated, |
185 | struct item_head *ih, | |
186 | __le32 * item, int pos_in_item) | |
1da177e4 | 187 | { |
bd4c625c LT |
188 | if (allocated) |
189 | return 0; | |
190 | if (retval == POSITION_FOUND && is_indirect_le_ih(ih) && | |
191 | get_block_num(item, pos_in_item)) | |
192 | return 0; | |
193 | return 1; | |
1da177e4 LT |
194 | } |
195 | ||
bd4c625c | 196 | static inline int indirect_item_found(int retval, struct item_head *ih) |
1da177e4 | 197 | { |
bd4c625c | 198 | return (retval == POSITION_FOUND) && is_indirect_le_ih(ih); |
1da177e4 LT |
199 | } |
200 | ||
bd4c625c LT |
201 | static inline void set_block_dev_mapped(struct buffer_head *bh, |
202 | b_blocknr_t block, struct inode *inode) | |
1da177e4 LT |
203 | { |
204 | map_bh(bh, inode->i_sb, block); | |
205 | } | |
206 | ||
1da177e4 LT |
207 | // |
208 | // files which were created in the earlier version can not be longer, | |
209 | // than 2 gb | |
210 | // | |
bd4c625c | 211 | static int file_capable(struct inode *inode, long block) |
1da177e4 | 212 | { |
bd4c625c LT |
213 | if (get_inode_item_key_version(inode) != KEY_FORMAT_3_5 || // it is new file. |
214 | block < (1 << (31 - inode->i_sb->s_blocksize_bits))) // old file, but 'block' is inside of 2gb | |
215 | return 1; | |
1da177e4 | 216 | |
bd4c625c | 217 | return 0; |
1da177e4 LT |
218 | } |
219 | ||
220 | /*static*/ int restart_transaction(struct reiserfs_transaction_handle *th, | |
bd4c625c LT |
221 | struct inode *inode, struct path *path) |
222 | { | |
223 | struct super_block *s = th->t_super; | |
224 | int len = th->t_blocks_allocated; | |
225 | int err; | |
226 | ||
227 | BUG_ON(!th->t_trans_id); | |
228 | BUG_ON(!th->t_refcount); | |
229 | ||
230 | /* we cannot restart while nested */ | |
231 | if (th->t_refcount > 1) { | |
232 | return 0; | |
233 | } | |
234 | pathrelse(path); | |
235 | reiserfs_update_sd(th, inode); | |
236 | err = journal_end(th, s, len); | |
237 | if (!err) { | |
238 | err = journal_begin(th, s, JOURNAL_PER_BALANCE_CNT * 6); | |
239 | if (!err) | |
240 | reiserfs_update_inode_transaction(inode); | |
241 | } | |
242 | return err; | |
1da177e4 LT |
243 | } |
244 | ||
245 | // it is called by get_block when create == 0. Returns block number | |
246 | // for 'block'-th logical block of file. When it hits direct item it | |
247 | // returns 0 (being called from bmap) or read direct item into piece | |
248 | // of page (bh_result) | |
249 | ||
250 | // Please improve the english/clarity in the comment above, as it is | |
251 | // hard to understand. | |
252 | ||
bd4c625c LT |
253 | static int _get_block_create_0(struct inode *inode, long block, |
254 | struct buffer_head *bh_result, int args) | |
1da177e4 | 255 | { |
bd4c625c LT |
256 | INITIALIZE_PATH(path); |
257 | struct cpu_key key; | |
258 | struct buffer_head *bh; | |
259 | struct item_head *ih, tmp_ih; | |
260 | int fs_gen; | |
261 | int blocknr; | |
262 | char *p = NULL; | |
263 | int chars; | |
264 | int ret; | |
265 | int result; | |
266 | int done = 0; | |
267 | unsigned long offset; | |
268 | ||
269 | // prepare the key to look for the 'block'-th block of file | |
270 | make_cpu_key(&key, inode, | |
271 | (loff_t) block * inode->i_sb->s_blocksize + 1, TYPE_ANY, | |
272 | 3); | |
273 | ||
274 | research: | |
275 | result = search_for_position_by_key(inode->i_sb, &key, &path); | |
276 | if (result != POSITION_FOUND) { | |
277 | pathrelse(&path); | |
278 | if (p) | |
279 | kunmap(bh_result->b_page); | |
280 | if (result == IO_ERROR) | |
281 | return -EIO; | |
282 | // We do not return -ENOENT if there is a hole but page is uptodate, because it means | |
283 | // That there is some MMAPED data associated with it that is yet to be written to disk. | |
284 | if ((args & GET_BLOCK_NO_HOLE) | |
285 | && !PageUptodate(bh_result->b_page)) { | |
286 | return -ENOENT; | |
287 | } | |
288 | return 0; | |
289 | } | |
290 | // | |
291 | bh = get_last_bh(&path); | |
292 | ih = get_ih(&path); | |
293 | if (is_indirect_le_ih(ih)) { | |
294 | __le32 *ind_item = (__le32 *) B_I_PITEM(bh, ih); | |
295 | ||
296 | /* FIXME: here we could cache indirect item or part of it in | |
297 | the inode to avoid search_by_key in case of subsequent | |
298 | access to file */ | |
299 | blocknr = get_block_num(ind_item, path.pos_in_item); | |
300 | ret = 0; | |
301 | if (blocknr) { | |
302 | map_bh(bh_result, inode->i_sb, blocknr); | |
303 | if (path.pos_in_item == | |
304 | ((ih_item_len(ih) / UNFM_P_SIZE) - 1)) { | |
305 | set_buffer_boundary(bh_result); | |
306 | } | |
307 | } else | |
308 | // We do not return -ENOENT if there is a hole but page is uptodate, because it means | |
309 | // That there is some MMAPED data associated with it that is yet to be written to disk. | |
310 | if ((args & GET_BLOCK_NO_HOLE) | |
311 | && !PageUptodate(bh_result->b_page)) { | |
312 | ret = -ENOENT; | |
313 | } | |
314 | ||
315 | pathrelse(&path); | |
316 | if (p) | |
317 | kunmap(bh_result->b_page); | |
318 | return ret; | |
319 | } | |
320 | // requested data are in direct item(s) | |
321 | if (!(args & GET_BLOCK_READ_DIRECT)) { | |
322 | // we are called by bmap. FIXME: we can not map block of file | |
323 | // when it is stored in direct item(s) | |
324 | pathrelse(&path); | |
325 | if (p) | |
326 | kunmap(bh_result->b_page); | |
327 | return -ENOENT; | |
328 | } | |
329 | ||
330 | /* if we've got a direct item, and the buffer or page was uptodate, | |
331 | ** we don't want to pull data off disk again. skip to the | |
332 | ** end, where we map the buffer and return | |
333 | */ | |
334 | if (buffer_uptodate(bh_result)) { | |
335 | goto finished; | |
336 | } else | |
337 | /* | |
338 | ** grab_tail_page can trigger calls to reiserfs_get_block on up to date | |
339 | ** pages without any buffers. If the page is up to date, we don't want | |
340 | ** read old data off disk. Set the up to date bit on the buffer instead | |
341 | ** and jump to the end | |
342 | */ | |
343 | if (!bh_result->b_page || PageUptodate(bh_result->b_page)) { | |
1da177e4 | 344 | set_buffer_uptodate(bh_result); |
bd4c625c LT |
345 | goto finished; |
346 | } | |
347 | // read file tail into part of page | |
348 | offset = (cpu_key_k_offset(&key) - 1) & (PAGE_CACHE_SIZE - 1); | |
349 | fs_gen = get_generation(inode->i_sb); | |
350 | copy_item_head(&tmp_ih, ih); | |
351 | ||
352 | /* we only want to kmap if we are reading the tail into the page. | |
353 | ** this is not the common case, so we don't kmap until we are | |
354 | ** sure we need to. But, this means the item might move if | |
355 | ** kmap schedules | |
356 | */ | |
357 | if (!p) { | |
358 | p = (char *)kmap(bh_result->b_page); | |
359 | if (fs_changed(fs_gen, inode->i_sb) | |
360 | && item_moved(&tmp_ih, &path)) { | |
361 | goto research; | |
362 | } | |
363 | } | |
364 | p += offset; | |
365 | memset(p, 0, inode->i_sb->s_blocksize); | |
366 | do { | |
367 | if (!is_direct_le_ih(ih)) { | |
368 | BUG(); | |
369 | } | |
370 | /* make sure we don't read more bytes than actually exist in | |
371 | ** the file. This can happen in odd cases where i_size isn't | |
372 | ** correct, and when direct item padding results in a few | |
373 | ** extra bytes at the end of the direct item | |
374 | */ | |
375 | if ((le_ih_k_offset(ih) + path.pos_in_item) > inode->i_size) | |
376 | break; | |
377 | if ((le_ih_k_offset(ih) - 1 + ih_item_len(ih)) > inode->i_size) { | |
378 | chars = | |
379 | inode->i_size - (le_ih_k_offset(ih) - 1) - | |
380 | path.pos_in_item; | |
381 | done = 1; | |
382 | } else { | |
383 | chars = ih_item_len(ih) - path.pos_in_item; | |
384 | } | |
385 | memcpy(p, B_I_PITEM(bh, ih) + path.pos_in_item, chars); | |
386 | ||
387 | if (done) | |
388 | break; | |
389 | ||
390 | p += chars; | |
391 | ||
392 | if (PATH_LAST_POSITION(&path) != (B_NR_ITEMS(bh) - 1)) | |
393 | // we done, if read direct item is not the last item of | |
394 | // node FIXME: we could try to check right delimiting key | |
395 | // to see whether direct item continues in the right | |
396 | // neighbor or rely on i_size | |
397 | break; | |
398 | ||
399 | // update key to look for the next piece | |
400 | set_cpu_key_k_offset(&key, cpu_key_k_offset(&key) + chars); | |
401 | result = search_for_position_by_key(inode->i_sb, &key, &path); | |
402 | if (result != POSITION_FOUND) | |
403 | // i/o error most likely | |
404 | break; | |
405 | bh = get_last_bh(&path); | |
406 | ih = get_ih(&path); | |
407 | } while (1); | |
408 | ||
409 | flush_dcache_page(bh_result->b_page); | |
410 | kunmap(bh_result->b_page); | |
411 | ||
412 | finished: | |
413 | pathrelse(&path); | |
414 | ||
415 | if (result == IO_ERROR) | |
416 | return -EIO; | |
1da177e4 | 417 | |
bd4c625c LT |
418 | /* this buffer has valid data, but isn't valid for io. mapping it to |
419 | * block #0 tells the rest of reiserfs it just has a tail in it | |
420 | */ | |
421 | map_bh(bh_result, inode->i_sb, 0); | |
422 | set_buffer_uptodate(bh_result); | |
423 | return 0; | |
424 | } | |
1da177e4 LT |
425 | |
426 | // this is called to create file map. So, _get_block_create_0 will not | |
427 | // read direct item | |
bd4c625c LT |
428 | static int reiserfs_bmap(struct inode *inode, sector_t block, |
429 | struct buffer_head *bh_result, int create) | |
1da177e4 | 430 | { |
bd4c625c LT |
431 | if (!file_capable(inode, block)) |
432 | return -EFBIG; | |
433 | ||
434 | reiserfs_write_lock(inode->i_sb); | |
435 | /* do not read the direct item */ | |
436 | _get_block_create_0(inode, block, bh_result, 0); | |
437 | reiserfs_write_unlock(inode->i_sb); | |
438 | return 0; | |
1da177e4 LT |
439 | } |
440 | ||
441 | /* special version of get_block that is only used by grab_tail_page right | |
442 | ** now. It is sent to block_prepare_write, and when you try to get a | |
443 | ** block past the end of the file (or a block from a hole) it returns | |
444 | ** -ENOENT instead of a valid buffer. block_prepare_write expects to | |
445 | ** be able to do i/o on the buffers returned, unless an error value | |
446 | ** is also returned. | |
447 | ** | |
448 | ** So, this allows block_prepare_write to be used for reading a single block | |
449 | ** in a page. Where it does not produce a valid page for holes, or past the | |
450 | ** end of the file. This turns out to be exactly what we need for reading | |
451 | ** tails for conversion. | |
452 | ** | |
453 | ** The point of the wrapper is forcing a certain value for create, even | |
454 | ** though the VFS layer is calling this function with create==1. If you | |
455 | ** don't want to send create == GET_BLOCK_NO_HOLE to reiserfs_get_block, | |
456 | ** don't use this function. | |
457 | */ | |
bd4c625c LT |
458 | static int reiserfs_get_block_create_0(struct inode *inode, sector_t block, |
459 | struct buffer_head *bh_result, | |
460 | int create) | |
461 | { | |
462 | return reiserfs_get_block(inode, block, bh_result, GET_BLOCK_NO_HOLE); | |
1da177e4 LT |
463 | } |
464 | ||
465 | /* This is special helper for reiserfs_get_block in case we are executing | |
466 | direct_IO request. */ | |
467 | static int reiserfs_get_blocks_direct_io(struct inode *inode, | |
468 | sector_t iblock, | |
469 | unsigned long max_blocks, | |
470 | struct buffer_head *bh_result, | |
471 | int create) | |
472 | { | |
bd4c625c LT |
473 | int ret; |
474 | ||
475 | bh_result->b_page = NULL; | |
1da177e4 | 476 | |
bd4c625c LT |
477 | /* We set the b_size before reiserfs_get_block call since it is |
478 | referenced in convert_tail_for_hole() that may be called from | |
479 | reiserfs_get_block() */ | |
480 | bh_result->b_size = (1 << inode->i_blkbits); | |
481 | ||
482 | ret = reiserfs_get_block(inode, iblock, bh_result, | |
483 | create | GET_BLOCK_NO_DANGLE); | |
484 | if (ret) | |
485 | goto out; | |
486 | ||
487 | /* don't allow direct io onto tail pages */ | |
488 | if (buffer_mapped(bh_result) && bh_result->b_blocknr == 0) { | |
489 | /* make sure future calls to the direct io funcs for this offset | |
490 | ** in the file fail by unmapping the buffer | |
491 | */ | |
492 | clear_buffer_mapped(bh_result); | |
493 | ret = -EINVAL; | |
494 | } | |
495 | /* Possible unpacked tail. Flush the data before pages have | |
496 | disappeared */ | |
497 | if (REISERFS_I(inode)->i_flags & i_pack_on_close_mask) { | |
498 | int err; | |
499 | lock_kernel(); | |
500 | err = reiserfs_commit_for_inode(inode); | |
501 | REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask; | |
502 | unlock_kernel(); | |
503 | if (err < 0) | |
504 | ret = err; | |
505 | } | |
506 | out: | |
507 | return ret; | |
508 | } | |
1da177e4 LT |
509 | |
510 | /* | |
511 | ** helper function for when reiserfs_get_block is called for a hole | |
512 | ** but the file tail is still in a direct item | |
513 | ** bh_result is the buffer head for the hole | |
514 | ** tail_offset is the offset of the start of the tail in the file | |
515 | ** | |
516 | ** This calls prepare_write, which will start a new transaction | |
517 | ** you should not be in a transaction, or have any paths held when you | |
518 | ** call this. | |
519 | */ | |
bd4c625c LT |
520 | static int convert_tail_for_hole(struct inode *inode, |
521 | struct buffer_head *bh_result, | |
522 | loff_t tail_offset) | |
523 | { | |
524 | unsigned long index; | |
525 | unsigned long tail_end; | |
526 | unsigned long tail_start; | |
527 | struct page *tail_page; | |
528 | struct page *hole_page = bh_result->b_page; | |
529 | int retval = 0; | |
530 | ||
531 | if ((tail_offset & (bh_result->b_size - 1)) != 1) | |
532 | return -EIO; | |
533 | ||
534 | /* always try to read until the end of the block */ | |
535 | tail_start = tail_offset & (PAGE_CACHE_SIZE - 1); | |
536 | tail_end = (tail_start | (bh_result->b_size - 1)) + 1; | |
537 | ||
538 | index = tail_offset >> PAGE_CACHE_SHIFT; | |
539 | /* hole_page can be zero in case of direct_io, we are sure | |
540 | that we cannot get here if we write with O_DIRECT into | |
541 | tail page */ | |
542 | if (!hole_page || index != hole_page->index) { | |
543 | tail_page = grab_cache_page(inode->i_mapping, index); | |
544 | retval = -ENOMEM; | |
545 | if (!tail_page) { | |
546 | goto out; | |
547 | } | |
548 | } else { | |
549 | tail_page = hole_page; | |
550 | } | |
551 | ||
552 | /* we don't have to make sure the conversion did not happen while | |
553 | ** we were locking the page because anyone that could convert | |
1b1dcc1b | 554 | ** must first take i_mutex. |
bd4c625c LT |
555 | ** |
556 | ** We must fix the tail page for writing because it might have buffers | |
557 | ** that are mapped, but have a block number of 0. This indicates tail | |
558 | ** data that has been read directly into the page, and block_prepare_write | |
559 | ** won't trigger a get_block in this case. | |
560 | */ | |
561 | fix_tail_page_for_writing(tail_page); | |
562 | retval = reiserfs_prepare_write(NULL, tail_page, tail_start, tail_end); | |
563 | if (retval) | |
564 | goto unlock; | |
565 | ||
566 | /* tail conversion might change the data in the page */ | |
567 | flush_dcache_page(tail_page); | |
568 | ||
569 | retval = reiserfs_commit_write(NULL, tail_page, tail_start, tail_end); | |
570 | ||
571 | unlock: | |
572 | if (tail_page != hole_page) { | |
573 | unlock_page(tail_page); | |
574 | page_cache_release(tail_page); | |
575 | } | |
576 | out: | |
577 | return retval; | |
1da177e4 LT |
578 | } |
579 | ||
580 | static inline int _allocate_block(struct reiserfs_transaction_handle *th, | |
bd4c625c LT |
581 | long block, |
582 | struct inode *inode, | |
583 | b_blocknr_t * allocated_block_nr, | |
584 | struct path *path, int flags) | |
585 | { | |
586 | BUG_ON(!th->t_trans_id); | |
587 | ||
1da177e4 | 588 | #ifdef REISERFS_PREALLOCATE |
1b1dcc1b | 589 | if (!(flags & GET_BLOCK_NO_IMUX)) { |
bd4c625c LT |
590 | return reiserfs_new_unf_blocknrs2(th, inode, allocated_block_nr, |
591 | path, block); | |
592 | } | |
1da177e4 | 593 | #endif |
bd4c625c LT |
594 | return reiserfs_new_unf_blocknrs(th, inode, allocated_block_nr, path, |
595 | block); | |
1da177e4 LT |
596 | } |
597 | ||
bd4c625c LT |
598 | int reiserfs_get_block(struct inode *inode, sector_t block, |
599 | struct buffer_head *bh_result, int create) | |
1da177e4 | 600 | { |
bd4c625c LT |
601 | int repeat, retval = 0; |
602 | b_blocknr_t allocated_block_nr = 0; // b_blocknr_t is (unsigned) 32 bit int | |
603 | INITIALIZE_PATH(path); | |
604 | int pos_in_item; | |
605 | struct cpu_key key; | |
606 | struct buffer_head *bh, *unbh = NULL; | |
607 | struct item_head *ih, tmp_ih; | |
608 | __le32 *item; | |
609 | int done; | |
610 | int fs_gen; | |
611 | struct reiserfs_transaction_handle *th = NULL; | |
612 | /* space reserved in transaction batch: | |
613 | . 3 balancings in direct->indirect conversion | |
614 | . 1 block involved into reiserfs_update_sd() | |
615 | XXX in practically impossible worst case direct2indirect() | |
616 | can incur (much) more than 3 balancings. | |
617 | quota update for user, group */ | |
618 | int jbegin_count = | |
619 | JOURNAL_PER_BALANCE_CNT * 3 + 1 + | |
620 | 2 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
621 | int version; | |
622 | int dangle = 1; | |
623 | loff_t new_offset = | |
624 | (((loff_t) block) << inode->i_sb->s_blocksize_bits) + 1; | |
625 | ||
626 | /* bad.... */ | |
627 | reiserfs_write_lock(inode->i_sb); | |
628 | version = get_inode_item_key_version(inode); | |
1da177e4 | 629 | |
bd4c625c LT |
630 | if (!file_capable(inode, block)) { |
631 | reiserfs_write_unlock(inode->i_sb); | |
632 | return -EFBIG; | |
633 | } | |
634 | ||
635 | /* if !create, we aren't changing the FS, so we don't need to | |
636 | ** log anything, so we don't need to start a transaction | |
637 | */ | |
638 | if (!(create & GET_BLOCK_CREATE)) { | |
639 | int ret; | |
640 | /* find number of block-th logical block of the file */ | |
641 | ret = _get_block_create_0(inode, block, bh_result, | |
642 | create | GET_BLOCK_READ_DIRECT); | |
643 | reiserfs_write_unlock(inode->i_sb); | |
644 | return ret; | |
645 | } | |
646 | /* | |
647 | * if we're already in a transaction, make sure to close | |
648 | * any new transactions we start in this func | |
649 | */ | |
650 | if ((create & GET_BLOCK_NO_DANGLE) || | |
651 | reiserfs_transaction_running(inode->i_sb)) | |
652 | dangle = 0; | |
653 | ||
654 | /* If file is of such a size, that it might have a tail and tails are enabled | |
655 | ** we should mark it as possibly needing tail packing on close | |
656 | */ | |
657 | if ((have_large_tails(inode->i_sb) | |
658 | && inode->i_size < i_block_size(inode) * 4) | |
659 | || (have_small_tails(inode->i_sb) | |
660 | && inode->i_size < i_block_size(inode))) | |
661 | REISERFS_I(inode)->i_flags |= i_pack_on_close_mask; | |
662 | ||
663 | /* set the key of the first byte in the 'block'-th block of file */ | |
664 | make_cpu_key(&key, inode, new_offset, TYPE_ANY, 3 /*key length */ ); | |
665 | if ((new_offset + inode->i_sb->s_blocksize - 1) > inode->i_size) { | |
666 | start_trans: | |
667 | th = reiserfs_persistent_transaction(inode->i_sb, jbegin_count); | |
668 | if (!th) { | |
669 | retval = -ENOMEM; | |
1da177e4 LT |
670 | goto failure; |
671 | } | |
bd4c625c LT |
672 | reiserfs_update_inode_transaction(inode); |
673 | } | |
674 | research: | |
1da177e4 | 675 | |
bd4c625c | 676 | retval = search_for_position_by_key(inode->i_sb, &key, &path); |
1da177e4 | 677 | if (retval == IO_ERROR) { |
bd4c625c LT |
678 | retval = -EIO; |
679 | goto failure; | |
680 | } | |
681 | ||
682 | bh = get_last_bh(&path); | |
683 | ih = get_ih(&path); | |
684 | item = get_item(&path); | |
1da177e4 | 685 | pos_in_item = path.pos_in_item; |
1da177e4 | 686 | |
bd4c625c LT |
687 | fs_gen = get_generation(inode->i_sb); |
688 | copy_item_head(&tmp_ih, ih); | |
689 | ||
690 | if (allocation_needed | |
691 | (retval, allocated_block_nr, ih, item, pos_in_item)) { | |
692 | /* we have to allocate block for the unformatted node */ | |
693 | if (!th) { | |
694 | pathrelse(&path); | |
695 | goto start_trans; | |
696 | } | |
697 | ||
698 | repeat = | |
699 | _allocate_block(th, block, inode, &allocated_block_nr, | |
700 | &path, create); | |
701 | ||
702 | if (repeat == NO_DISK_SPACE || repeat == QUOTA_EXCEEDED) { | |
703 | /* restart the transaction to give the journal a chance to free | |
704 | ** some blocks. releases the path, so we have to go back to | |
705 | ** research if we succeed on the second try | |
706 | */ | |
707 | SB_JOURNAL(inode->i_sb)->j_next_async_flush = 1; | |
708 | retval = restart_transaction(th, inode, &path); | |
709 | if (retval) | |
710 | goto failure; | |
711 | repeat = | |
712 | _allocate_block(th, block, inode, | |
713 | &allocated_block_nr, NULL, create); | |
714 | ||
715 | if (repeat != NO_DISK_SPACE && repeat != QUOTA_EXCEEDED) { | |
716 | goto research; | |
717 | } | |
718 | if (repeat == QUOTA_EXCEEDED) | |
719 | retval = -EDQUOT; | |
720 | else | |
721 | retval = -ENOSPC; | |
722 | goto failure; | |
723 | } | |
724 | ||
725 | if (fs_changed(fs_gen, inode->i_sb) | |
726 | && item_moved(&tmp_ih, &path)) { | |
727 | goto research; | |
728 | } | |
729 | } | |
730 | ||
731 | if (indirect_item_found(retval, ih)) { | |
732 | b_blocknr_t unfm_ptr; | |
733 | /* 'block'-th block is in the file already (there is | |
734 | corresponding cell in some indirect item). But it may be | |
735 | zero unformatted node pointer (hole) */ | |
736 | unfm_ptr = get_block_num(item, pos_in_item); | |
737 | if (unfm_ptr == 0) { | |
738 | /* use allocated block to plug the hole */ | |
739 | reiserfs_prepare_for_journal(inode->i_sb, bh, 1); | |
740 | if (fs_changed(fs_gen, inode->i_sb) | |
741 | && item_moved(&tmp_ih, &path)) { | |
742 | reiserfs_restore_prepared_buffer(inode->i_sb, | |
743 | bh); | |
744 | goto research; | |
745 | } | |
746 | set_buffer_new(bh_result); | |
747 | if (buffer_dirty(bh_result) | |
748 | && reiserfs_data_ordered(inode->i_sb)) | |
749 | reiserfs_add_ordered_list(inode, bh_result); | |
750 | put_block_num(item, pos_in_item, allocated_block_nr); | |
751 | unfm_ptr = allocated_block_nr; | |
752 | journal_mark_dirty(th, inode->i_sb, bh); | |
753 | reiserfs_update_sd(th, inode); | |
754 | } | |
755 | set_block_dev_mapped(bh_result, unfm_ptr, inode); | |
756 | pathrelse(&path); | |
757 | retval = 0; | |
758 | if (!dangle && th) | |
759 | retval = reiserfs_end_persistent_transaction(th); | |
760 | ||
761 | reiserfs_write_unlock(inode->i_sb); | |
762 | ||
763 | /* the item was found, so new blocks were not added to the file | |
764 | ** there is no need to make sure the inode is updated with this | |
765 | ** transaction | |
766 | */ | |
767 | return retval; | |
768 | } | |
769 | ||
770 | if (!th) { | |
771 | pathrelse(&path); | |
772 | goto start_trans; | |
773 | } | |
774 | ||
775 | /* desired position is not found or is in the direct item. We have | |
776 | to append file with holes up to 'block'-th block converting | |
777 | direct items to indirect one if necessary */ | |
778 | done = 0; | |
779 | do { | |
780 | if (is_statdata_le_ih(ih)) { | |
781 | __le32 unp = 0; | |
782 | struct cpu_key tmp_key; | |
783 | ||
784 | /* indirect item has to be inserted */ | |
785 | make_le_item_head(&tmp_ih, &key, version, 1, | |
786 | TYPE_INDIRECT, UNFM_P_SIZE, | |
787 | 0 /* free_space */ ); | |
788 | ||
789 | if (cpu_key_k_offset(&key) == 1) { | |
790 | /* we are going to add 'block'-th block to the file. Use | |
791 | allocated block for that */ | |
792 | unp = cpu_to_le32(allocated_block_nr); | |
793 | set_block_dev_mapped(bh_result, | |
794 | allocated_block_nr, inode); | |
795 | set_buffer_new(bh_result); | |
796 | done = 1; | |
797 | } | |
798 | tmp_key = key; // ;) | |
799 | set_cpu_key_k_offset(&tmp_key, 1); | |
800 | PATH_LAST_POSITION(&path)++; | |
801 | ||
802 | retval = | |
803 | reiserfs_insert_item(th, &path, &tmp_key, &tmp_ih, | |
804 | inode, (char *)&unp); | |
805 | if (retval) { | |
806 | reiserfs_free_block(th, inode, | |
807 | allocated_block_nr, 1); | |
808 | goto failure; // retval == -ENOSPC, -EDQUOT or -EIO or -EEXIST | |
809 | } | |
810 | //mark_tail_converted (inode); | |
811 | } else if (is_direct_le_ih(ih)) { | |
812 | /* direct item has to be converted */ | |
813 | loff_t tail_offset; | |
814 | ||
815 | tail_offset = | |
816 | ((le_ih_k_offset(ih) - | |
817 | 1) & ~(inode->i_sb->s_blocksize - 1)) + 1; | |
818 | if (tail_offset == cpu_key_k_offset(&key)) { | |
819 | /* direct item we just found fits into block we have | |
820 | to map. Convert it into unformatted node: use | |
821 | bh_result for the conversion */ | |
822 | set_block_dev_mapped(bh_result, | |
823 | allocated_block_nr, inode); | |
824 | unbh = bh_result; | |
825 | done = 1; | |
826 | } else { | |
827 | /* we have to padd file tail stored in direct item(s) | |
828 | up to block size and convert it to unformatted | |
829 | node. FIXME: this should also get into page cache */ | |
830 | ||
831 | pathrelse(&path); | |
832 | /* | |
833 | * ugly, but we can only end the transaction if | |
834 | * we aren't nested | |
835 | */ | |
836 | BUG_ON(!th->t_refcount); | |
837 | if (th->t_refcount == 1) { | |
838 | retval = | |
839 | reiserfs_end_persistent_transaction | |
840 | (th); | |
841 | th = NULL; | |
842 | if (retval) | |
843 | goto failure; | |
844 | } | |
845 | ||
846 | retval = | |
847 | convert_tail_for_hole(inode, bh_result, | |
848 | tail_offset); | |
849 | if (retval) { | |
850 | if (retval != -ENOSPC) | |
851 | reiserfs_warning(inode->i_sb, | |
852 | "clm-6004: convert tail failed inode %lu, error %d", | |
853 | inode->i_ino, | |
854 | retval); | |
855 | if (allocated_block_nr) { | |
856 | /* the bitmap, the super, and the stat data == 3 */ | |
857 | if (!th) | |
858 | th = reiserfs_persistent_transaction(inode->i_sb, 3); | |
859 | if (th) | |
860 | reiserfs_free_block(th, | |
861 | inode, | |
862 | allocated_block_nr, | |
863 | 1); | |
864 | } | |
865 | goto failure; | |
866 | } | |
867 | goto research; | |
868 | } | |
869 | retval = | |
870 | direct2indirect(th, inode, &path, unbh, | |
871 | tail_offset); | |
872 | if (retval) { | |
873 | reiserfs_unmap_buffer(unbh); | |
874 | reiserfs_free_block(th, inode, | |
875 | allocated_block_nr, 1); | |
876 | goto failure; | |
877 | } | |
878 | /* it is important the set_buffer_uptodate is done after | |
879 | ** the direct2indirect. The buffer might contain valid | |
880 | ** data newer than the data on disk (read by readpage, changed, | |
881 | ** and then sent here by writepage). direct2indirect needs | |
882 | ** to know if unbh was already up to date, so it can decide | |
883 | ** if the data in unbh needs to be replaced with data from | |
884 | ** the disk | |
885 | */ | |
886 | set_buffer_uptodate(unbh); | |
887 | ||
888 | /* unbh->b_page == NULL in case of DIRECT_IO request, this means | |
889 | buffer will disappear shortly, so it should not be added to | |
890 | */ | |
891 | if (unbh->b_page) { | |
892 | /* we've converted the tail, so we must | |
893 | ** flush unbh before the transaction commits | |
894 | */ | |
895 | reiserfs_add_tail_list(inode, unbh); | |
896 | ||
897 | /* mark it dirty now to prevent commit_write from adding | |
898 | ** this buffer to the inode's dirty buffer list | |
899 | */ | |
900 | /* | |
901 | * AKPM: changed __mark_buffer_dirty to mark_buffer_dirty(). | |
902 | * It's still atomic, but it sets the page dirty too, | |
903 | * which makes it eligible for writeback at any time by the | |
904 | * VM (which was also the case with __mark_buffer_dirty()) | |
905 | */ | |
906 | mark_buffer_dirty(unbh); | |
907 | } | |
908 | } else { | |
909 | /* append indirect item with holes if needed, when appending | |
910 | pointer to 'block'-th block use block, which is already | |
911 | allocated */ | |
912 | struct cpu_key tmp_key; | |
913 | unp_t unf_single = 0; // We use this in case we need to allocate only | |
914 | // one block which is a fastpath | |
915 | unp_t *un; | |
916 | __u64 max_to_insert = | |
917 | MAX_ITEM_LEN(inode->i_sb->s_blocksize) / | |
918 | UNFM_P_SIZE; | |
919 | __u64 blocks_needed; | |
920 | ||
921 | RFALSE(pos_in_item != ih_item_len(ih) / UNFM_P_SIZE, | |
922 | "vs-804: invalid position for append"); | |
923 | /* indirect item has to be appended, set up key of that position */ | |
924 | make_cpu_key(&tmp_key, inode, | |
925 | le_key_k_offset(version, | |
926 | &(ih->ih_key)) + | |
927 | op_bytes_number(ih, | |
928 | inode->i_sb->s_blocksize), | |
929 | //pos_in_item * inode->i_sb->s_blocksize, | |
930 | TYPE_INDIRECT, 3); // key type is unimportant | |
931 | ||
c499ec24 VS |
932 | RFALSE(cpu_key_k_offset(&tmp_key) > cpu_key_k_offset(&key), |
933 | "green-805: invalid offset"); | |
bd4c625c LT |
934 | blocks_needed = |
935 | 1 + | |
936 | ((cpu_key_k_offset(&key) - | |
937 | cpu_key_k_offset(&tmp_key)) >> inode->i_sb-> | |
938 | s_blocksize_bits); | |
bd4c625c LT |
939 | |
940 | if (blocks_needed == 1) { | |
941 | un = &unf_single; | |
942 | } else { | |
943 | un = kmalloc(min(blocks_needed, max_to_insert) * UNFM_P_SIZE, GFP_ATOMIC); // We need to avoid scheduling. | |
944 | if (!un) { | |
945 | un = &unf_single; | |
946 | blocks_needed = 1; | |
947 | max_to_insert = 0; | |
948 | } else | |
949 | memset(un, 0, | |
950 | UNFM_P_SIZE * min(blocks_needed, | |
951 | max_to_insert)); | |
952 | } | |
953 | if (blocks_needed <= max_to_insert) { | |
954 | /* we are going to add target block to the file. Use allocated | |
955 | block for that */ | |
956 | un[blocks_needed - 1] = | |
957 | cpu_to_le32(allocated_block_nr); | |
958 | set_block_dev_mapped(bh_result, | |
959 | allocated_block_nr, inode); | |
960 | set_buffer_new(bh_result); | |
961 | done = 1; | |
962 | } else { | |
963 | /* paste hole to the indirect item */ | |
964 | /* If kmalloc failed, max_to_insert becomes zero and it means we | |
965 | only have space for one block */ | |
966 | blocks_needed = | |
967 | max_to_insert ? max_to_insert : 1; | |
968 | } | |
969 | retval = | |
970 | reiserfs_paste_into_item(th, &path, &tmp_key, inode, | |
971 | (char *)un, | |
972 | UNFM_P_SIZE * | |
973 | blocks_needed); | |
974 | ||
975 | if (blocks_needed != 1) | |
976 | kfree(un); | |
977 | ||
978 | if (retval) { | |
979 | reiserfs_free_block(th, inode, | |
980 | allocated_block_nr, 1); | |
981 | goto failure; | |
982 | } | |
983 | if (!done) { | |
984 | /* We need to mark new file size in case this function will be | |
985 | interrupted/aborted later on. And we may do this only for | |
986 | holes. */ | |
987 | inode->i_size += | |
988 | inode->i_sb->s_blocksize * blocks_needed; | |
989 | } | |
990 | } | |
1da177e4 | 991 | |
bd4c625c LT |
992 | if (done == 1) |
993 | break; | |
1da177e4 | 994 | |
bd4c625c LT |
995 | /* this loop could log more blocks than we had originally asked |
996 | ** for. So, we have to allow the transaction to end if it is | |
997 | ** too big or too full. Update the inode so things are | |
998 | ** consistent if we crash before the function returns | |
999 | ** | |
1000 | ** release the path so that anybody waiting on the path before | |
1001 | ** ending their transaction will be able to continue. | |
1002 | */ | |
1003 | if (journal_transaction_should_end(th, th->t_blocks_allocated)) { | |
1004 | retval = restart_transaction(th, inode, &path); | |
1005 | if (retval) | |
1006 | goto failure; | |
1007 | } | |
1008 | /* inserting indirect pointers for a hole can take a | |
1009 | ** long time. reschedule if needed | |
1010 | */ | |
1011 | cond_resched(); | |
1da177e4 | 1012 | |
bd4c625c LT |
1013 | retval = search_for_position_by_key(inode->i_sb, &key, &path); |
1014 | if (retval == IO_ERROR) { | |
1015 | retval = -EIO; | |
1016 | goto failure; | |
1017 | } | |
1018 | if (retval == POSITION_FOUND) { | |
1019 | reiserfs_warning(inode->i_sb, | |
1020 | "vs-825: reiserfs_get_block: " | |
1021 | "%K should not be found", &key); | |
1022 | retval = -EEXIST; | |
1023 | if (allocated_block_nr) | |
1024 | reiserfs_free_block(th, inode, | |
1025 | allocated_block_nr, 1); | |
1026 | pathrelse(&path); | |
1027 | goto failure; | |
1028 | } | |
1029 | bh = get_last_bh(&path); | |
1030 | ih = get_ih(&path); | |
1031 | item = get_item(&path); | |
1032 | pos_in_item = path.pos_in_item; | |
1033 | } while (1); | |
1034 | ||
1035 | retval = 0; | |
1036 | ||
1037 | failure: | |
1038 | if (th && (!dangle || (retval && !th->t_trans_id))) { | |
1039 | int err; | |
1040 | if (th->t_trans_id) | |
1041 | reiserfs_update_sd(th, inode); | |
1042 | err = reiserfs_end_persistent_transaction(th); | |
1043 | if (err) | |
1044 | retval = err; | |
1045 | } | |
1046 | ||
1047 | reiserfs_write_unlock(inode->i_sb); | |
1048 | reiserfs_check_path(&path); | |
1049 | return retval; | |
1da177e4 LT |
1050 | } |
1051 | ||
1052 | static int | |
1053 | reiserfs_readpages(struct file *file, struct address_space *mapping, | |
bd4c625c | 1054 | struct list_head *pages, unsigned nr_pages) |
1da177e4 | 1055 | { |
bd4c625c | 1056 | return mpage_readpages(mapping, pages, nr_pages, reiserfs_get_block); |
1da177e4 LT |
1057 | } |
1058 | ||
1059 | /* Compute real number of used bytes by file | |
1060 | * Following three functions can go away when we'll have enough space in stat item | |
1061 | */ | |
1062 | static int real_space_diff(struct inode *inode, int sd_size) | |
1063 | { | |
bd4c625c LT |
1064 | int bytes; |
1065 | loff_t blocksize = inode->i_sb->s_blocksize; | |
1066 | ||
1067 | if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) | |
1068 | return sd_size; | |
1069 | ||
1070 | /* End of file is also in full block with indirect reference, so round | |
1071 | ** up to the next block. | |
1072 | ** | |
1073 | ** there is just no way to know if the tail is actually packed | |
1074 | ** on the file, so we have to assume it isn't. When we pack the | |
1075 | ** tail, we add 4 bytes to pretend there really is an unformatted | |
1076 | ** node pointer | |
1077 | */ | |
1078 | bytes = | |
1079 | ((inode->i_size + | |
1080 | (blocksize - 1)) >> inode->i_sb->s_blocksize_bits) * UNFM_P_SIZE + | |
1081 | sd_size; | |
1082 | return bytes; | |
1da177e4 LT |
1083 | } |
1084 | ||
1085 | static inline loff_t to_real_used_space(struct inode *inode, ulong blocks, | |
bd4c625c | 1086 | int sd_size) |
1da177e4 | 1087 | { |
bd4c625c LT |
1088 | if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) { |
1089 | return inode->i_size + | |
1090 | (loff_t) (real_space_diff(inode, sd_size)); | |
1091 | } | |
1092 | return ((loff_t) real_space_diff(inode, sd_size)) + | |
1093 | (((loff_t) blocks) << 9); | |
1da177e4 LT |
1094 | } |
1095 | ||
1096 | /* Compute number of blocks used by file in ReiserFS counting */ | |
1097 | static inline ulong to_fake_used_blocks(struct inode *inode, int sd_size) | |
1098 | { | |
bd4c625c LT |
1099 | loff_t bytes = inode_get_bytes(inode); |
1100 | loff_t real_space = real_space_diff(inode, sd_size); | |
1101 | ||
1102 | /* keeps fsck and non-quota versions of reiserfs happy */ | |
1103 | if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) { | |
1104 | bytes += (loff_t) 511; | |
1105 | } | |
1106 | ||
1107 | /* files from before the quota patch might i_blocks such that | |
1108 | ** bytes < real_space. Deal with that here to prevent it from | |
1109 | ** going negative. | |
1110 | */ | |
1111 | if (bytes < real_space) | |
1112 | return 0; | |
1113 | return (bytes - real_space) >> 9; | |
1da177e4 LT |
1114 | } |
1115 | ||
1116 | // | |
1117 | // BAD: new directories have stat data of new type and all other items | |
1118 | // of old type. Version stored in the inode says about body items, so | |
1119 | // in update_stat_data we can not rely on inode, but have to check | |
1120 | // item version directly | |
1121 | // | |
1122 | ||
1123 | // called by read_locked_inode | |
bd4c625c | 1124 | static void init_inode(struct inode *inode, struct path *path) |
1da177e4 | 1125 | { |
bd4c625c LT |
1126 | struct buffer_head *bh; |
1127 | struct item_head *ih; | |
1128 | __u32 rdev; | |
1129 | //int version = ITEM_VERSION_1; | |
1130 | ||
1131 | bh = PATH_PLAST_BUFFER(path); | |
1132 | ih = PATH_PITEM_HEAD(path); | |
1133 | ||
1134 | copy_key(INODE_PKEY(inode), &(ih->ih_key)); | |
1135 | inode->i_blksize = reiserfs_default_io_size; | |
1136 | ||
1137 | INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list)); | |
1138 | REISERFS_I(inode)->i_flags = 0; | |
1139 | REISERFS_I(inode)->i_prealloc_block = 0; | |
1140 | REISERFS_I(inode)->i_prealloc_count = 0; | |
1141 | REISERFS_I(inode)->i_trans_id = 0; | |
1142 | REISERFS_I(inode)->i_jl = NULL; | |
1143 | REISERFS_I(inode)->i_acl_access = NULL; | |
1144 | REISERFS_I(inode)->i_acl_default = NULL; | |
1145 | init_rwsem(&REISERFS_I(inode)->xattr_sem); | |
1146 | ||
1147 | if (stat_data_v1(ih)) { | |
1148 | struct stat_data_v1 *sd = | |
1149 | (struct stat_data_v1 *)B_I_PITEM(bh, ih); | |
1150 | unsigned long blocks; | |
1151 | ||
1152 | set_inode_item_key_version(inode, KEY_FORMAT_3_5); | |
1153 | set_inode_sd_version(inode, STAT_DATA_V1); | |
1154 | inode->i_mode = sd_v1_mode(sd); | |
1155 | inode->i_nlink = sd_v1_nlink(sd); | |
1156 | inode->i_uid = sd_v1_uid(sd); | |
1157 | inode->i_gid = sd_v1_gid(sd); | |
1158 | inode->i_size = sd_v1_size(sd); | |
1159 | inode->i_atime.tv_sec = sd_v1_atime(sd); | |
1160 | inode->i_mtime.tv_sec = sd_v1_mtime(sd); | |
1161 | inode->i_ctime.tv_sec = sd_v1_ctime(sd); | |
1162 | inode->i_atime.tv_nsec = 0; | |
1163 | inode->i_ctime.tv_nsec = 0; | |
1164 | inode->i_mtime.tv_nsec = 0; | |
1165 | ||
1166 | inode->i_blocks = sd_v1_blocks(sd); | |
1167 | inode->i_generation = le32_to_cpu(INODE_PKEY(inode)->k_dir_id); | |
1168 | blocks = (inode->i_size + 511) >> 9; | |
1169 | blocks = _ROUND_UP(blocks, inode->i_sb->s_blocksize >> 9); | |
1170 | if (inode->i_blocks > blocks) { | |
1171 | // there was a bug in <=3.5.23 when i_blocks could take negative | |
1172 | // values. Starting from 3.5.17 this value could even be stored in | |
1173 | // stat data. For such files we set i_blocks based on file | |
1174 | // size. Just 2 notes: this can be wrong for sparce files. On-disk value will be | |
1175 | // only updated if file's inode will ever change | |
1176 | inode->i_blocks = blocks; | |
1177 | } | |
1da177e4 | 1178 | |
bd4c625c LT |
1179 | rdev = sd_v1_rdev(sd); |
1180 | REISERFS_I(inode)->i_first_direct_byte = | |
1181 | sd_v1_first_direct_byte(sd); | |
1182 | /* an early bug in the quota code can give us an odd number for the | |
1183 | ** block count. This is incorrect, fix it here. | |
1184 | */ | |
1185 | if (inode->i_blocks & 1) { | |
1186 | inode->i_blocks++; | |
1187 | } | |
1188 | inode_set_bytes(inode, | |
1189 | to_real_used_space(inode, inode->i_blocks, | |
1190 | SD_V1_SIZE)); | |
1191 | /* nopack is initially zero for v1 objects. For v2 objects, | |
1192 | nopack is initialised from sd_attrs */ | |
1193 | REISERFS_I(inode)->i_flags &= ~i_nopack_mask; | |
1194 | } else { | |
1195 | // new stat data found, but object may have old items | |
1196 | // (directories and symlinks) | |
1197 | struct stat_data *sd = (struct stat_data *)B_I_PITEM(bh, ih); | |
1198 | ||
1199 | inode->i_mode = sd_v2_mode(sd); | |
1200 | inode->i_nlink = sd_v2_nlink(sd); | |
1201 | inode->i_uid = sd_v2_uid(sd); | |
1202 | inode->i_size = sd_v2_size(sd); | |
1203 | inode->i_gid = sd_v2_gid(sd); | |
1204 | inode->i_mtime.tv_sec = sd_v2_mtime(sd); | |
1205 | inode->i_atime.tv_sec = sd_v2_atime(sd); | |
1206 | inode->i_ctime.tv_sec = sd_v2_ctime(sd); | |
1207 | inode->i_ctime.tv_nsec = 0; | |
1208 | inode->i_mtime.tv_nsec = 0; | |
1209 | inode->i_atime.tv_nsec = 0; | |
1210 | inode->i_blocks = sd_v2_blocks(sd); | |
1211 | rdev = sd_v2_rdev(sd); | |
1212 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
1213 | inode->i_generation = | |
1214 | le32_to_cpu(INODE_PKEY(inode)->k_dir_id); | |
1215 | else | |
1216 | inode->i_generation = sd_v2_generation(sd); | |
1da177e4 | 1217 | |
bd4c625c LT |
1218 | if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) |
1219 | set_inode_item_key_version(inode, KEY_FORMAT_3_5); | |
1220 | else | |
1221 | set_inode_item_key_version(inode, KEY_FORMAT_3_6); | |
1222 | REISERFS_I(inode)->i_first_direct_byte = 0; | |
1223 | set_inode_sd_version(inode, STAT_DATA_V2); | |
1224 | inode_set_bytes(inode, | |
1225 | to_real_used_space(inode, inode->i_blocks, | |
1226 | SD_V2_SIZE)); | |
1227 | /* read persistent inode attributes from sd and initalise | |
1228 | generic inode flags from them */ | |
1229 | REISERFS_I(inode)->i_attrs = sd_v2_attrs(sd); | |
1230 | sd_attrs_to_i_attrs(sd_v2_attrs(sd), inode); | |
1231 | } | |
1232 | ||
1233 | pathrelse(path); | |
1234 | if (S_ISREG(inode->i_mode)) { | |
1235 | inode->i_op = &reiserfs_file_inode_operations; | |
1236 | inode->i_fop = &reiserfs_file_operations; | |
1237 | inode->i_mapping->a_ops = &reiserfs_address_space_operations; | |
1238 | } else if (S_ISDIR(inode->i_mode)) { | |
1239 | inode->i_op = &reiserfs_dir_inode_operations; | |
1240 | inode->i_fop = &reiserfs_dir_operations; | |
1241 | } else if (S_ISLNK(inode->i_mode)) { | |
1242 | inode->i_op = &reiserfs_symlink_inode_operations; | |
1243 | inode->i_mapping->a_ops = &reiserfs_address_space_operations; | |
1244 | } else { | |
1245 | inode->i_blocks = 0; | |
1246 | inode->i_op = &reiserfs_special_inode_operations; | |
1247 | init_special_inode(inode, inode->i_mode, new_decode_dev(rdev)); | |
1248 | } | |
1249 | } | |
1da177e4 LT |
1250 | |
1251 | // update new stat data with inode fields | |
bd4c625c | 1252 | static void inode2sd(void *sd, struct inode *inode, loff_t size) |
1da177e4 | 1253 | { |
bd4c625c LT |
1254 | struct stat_data *sd_v2 = (struct stat_data *)sd; |
1255 | __u16 flags; | |
1256 | ||
1257 | set_sd_v2_mode(sd_v2, inode->i_mode); | |
1258 | set_sd_v2_nlink(sd_v2, inode->i_nlink); | |
1259 | set_sd_v2_uid(sd_v2, inode->i_uid); | |
1260 | set_sd_v2_size(sd_v2, size); | |
1261 | set_sd_v2_gid(sd_v2, inode->i_gid); | |
1262 | set_sd_v2_mtime(sd_v2, inode->i_mtime.tv_sec); | |
1263 | set_sd_v2_atime(sd_v2, inode->i_atime.tv_sec); | |
1264 | set_sd_v2_ctime(sd_v2, inode->i_ctime.tv_sec); | |
1265 | set_sd_v2_blocks(sd_v2, to_fake_used_blocks(inode, SD_V2_SIZE)); | |
1266 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
1267 | set_sd_v2_rdev(sd_v2, new_encode_dev(inode->i_rdev)); | |
1268 | else | |
1269 | set_sd_v2_generation(sd_v2, inode->i_generation); | |
1270 | flags = REISERFS_I(inode)->i_attrs; | |
1271 | i_attrs_to_sd_attrs(inode, &flags); | |
1272 | set_sd_v2_attrs(sd_v2, flags); | |
1da177e4 LT |
1273 | } |
1274 | ||
1da177e4 | 1275 | // used to copy inode's fields to old stat data |
bd4c625c | 1276 | static void inode2sd_v1(void *sd, struct inode *inode, loff_t size) |
1da177e4 | 1277 | { |
bd4c625c LT |
1278 | struct stat_data_v1 *sd_v1 = (struct stat_data_v1 *)sd; |
1279 | ||
1280 | set_sd_v1_mode(sd_v1, inode->i_mode); | |
1281 | set_sd_v1_uid(sd_v1, inode->i_uid); | |
1282 | set_sd_v1_gid(sd_v1, inode->i_gid); | |
1283 | set_sd_v1_nlink(sd_v1, inode->i_nlink); | |
1284 | set_sd_v1_size(sd_v1, size); | |
1285 | set_sd_v1_atime(sd_v1, inode->i_atime.tv_sec); | |
1286 | set_sd_v1_ctime(sd_v1, inode->i_ctime.tv_sec); | |
1287 | set_sd_v1_mtime(sd_v1, inode->i_mtime.tv_sec); | |
1288 | ||
1289 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
1290 | set_sd_v1_rdev(sd_v1, new_encode_dev(inode->i_rdev)); | |
1291 | else | |
1292 | set_sd_v1_blocks(sd_v1, to_fake_used_blocks(inode, SD_V1_SIZE)); | |
1da177e4 | 1293 | |
bd4c625c LT |
1294 | // Sigh. i_first_direct_byte is back |
1295 | set_sd_v1_first_direct_byte(sd_v1, | |
1296 | REISERFS_I(inode)->i_first_direct_byte); | |
1297 | } | |
1da177e4 LT |
1298 | |
1299 | /* NOTE, you must prepare the buffer head before sending it here, | |
1300 | ** and then log it after the call | |
1301 | */ | |
bd4c625c LT |
1302 | static void update_stat_data(struct path *path, struct inode *inode, |
1303 | loff_t size) | |
1da177e4 | 1304 | { |
bd4c625c LT |
1305 | struct buffer_head *bh; |
1306 | struct item_head *ih; | |
1307 | ||
1308 | bh = PATH_PLAST_BUFFER(path); | |
1309 | ih = PATH_PITEM_HEAD(path); | |
1310 | ||
1311 | if (!is_statdata_le_ih(ih)) | |
1312 | reiserfs_panic(inode->i_sb, | |
1313 | "vs-13065: update_stat_data: key %k, found item %h", | |
1314 | INODE_PKEY(inode), ih); | |
1315 | ||
1316 | if (stat_data_v1(ih)) { | |
1317 | // path points to old stat data | |
1318 | inode2sd_v1(B_I_PITEM(bh, ih), inode, size); | |
1319 | } else { | |
1320 | inode2sd(B_I_PITEM(bh, ih), inode, size); | |
1321 | } | |
1da177e4 | 1322 | |
bd4c625c LT |
1323 | return; |
1324 | } | |
1da177e4 | 1325 | |
bd4c625c LT |
1326 | void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th, |
1327 | struct inode *inode, loff_t size) | |
1da177e4 | 1328 | { |
bd4c625c LT |
1329 | struct cpu_key key; |
1330 | INITIALIZE_PATH(path); | |
1331 | struct buffer_head *bh; | |
1332 | int fs_gen; | |
1333 | struct item_head *ih, tmp_ih; | |
1334 | int retval; | |
1335 | ||
1336 | BUG_ON(!th->t_trans_id); | |
1337 | ||
1338 | make_cpu_key(&key, inode, SD_OFFSET, TYPE_STAT_DATA, 3); //key type is unimportant | |
1339 | ||
1340 | for (;;) { | |
1341 | int pos; | |
1342 | /* look for the object's stat data */ | |
1343 | retval = search_item(inode->i_sb, &key, &path); | |
1344 | if (retval == IO_ERROR) { | |
1345 | reiserfs_warning(inode->i_sb, | |
1346 | "vs-13050: reiserfs_update_sd: " | |
1347 | "i/o failure occurred trying to update %K stat data", | |
1348 | &key); | |
1349 | return; | |
1350 | } | |
1351 | if (retval == ITEM_NOT_FOUND) { | |
1352 | pos = PATH_LAST_POSITION(&path); | |
1353 | pathrelse(&path); | |
1354 | if (inode->i_nlink == 0) { | |
1355 | /*reiserfs_warning (inode->i_sb, "vs-13050: reiserfs_update_sd: i_nlink == 0, stat data not found"); */ | |
1356 | return; | |
1357 | } | |
1358 | reiserfs_warning(inode->i_sb, | |
1359 | "vs-13060: reiserfs_update_sd: " | |
1360 | "stat data of object %k (nlink == %d) not found (pos %d)", | |
1361 | INODE_PKEY(inode), inode->i_nlink, | |
1362 | pos); | |
1363 | reiserfs_check_path(&path); | |
1364 | return; | |
1365 | } | |
1366 | ||
1367 | /* sigh, prepare_for_journal might schedule. When it schedules the | |
1368 | ** FS might change. We have to detect that, and loop back to the | |
1369 | ** search if the stat data item has moved | |
1370 | */ | |
1371 | bh = get_last_bh(&path); | |
1372 | ih = get_ih(&path); | |
1373 | copy_item_head(&tmp_ih, ih); | |
1374 | fs_gen = get_generation(inode->i_sb); | |
1375 | reiserfs_prepare_for_journal(inode->i_sb, bh, 1); | |
1376 | if (fs_changed(fs_gen, inode->i_sb) | |
1377 | && item_moved(&tmp_ih, &path)) { | |
1378 | reiserfs_restore_prepared_buffer(inode->i_sb, bh); | |
1379 | continue; /* Stat_data item has been moved after scheduling. */ | |
1380 | } | |
1381 | break; | |
1382 | } | |
1383 | update_stat_data(&path, inode, size); | |
1384 | journal_mark_dirty(th, th->t_super, bh); | |
1385 | pathrelse(&path); | |
1386 | return; | |
1da177e4 LT |
1387 | } |
1388 | ||
1389 | /* reiserfs_read_locked_inode is called to read the inode off disk, and it | |
1390 | ** does a make_bad_inode when things go wrong. But, we need to make sure | |
1391 | ** and clear the key in the private portion of the inode, otherwise a | |
1392 | ** corresponding iput might try to delete whatever object the inode last | |
1393 | ** represented. | |
1394 | */ | |
bd4c625c LT |
1395 | static void reiserfs_make_bad_inode(struct inode *inode) |
1396 | { | |
1397 | memset(INODE_PKEY(inode), 0, KEY_SIZE); | |
1398 | make_bad_inode(inode); | |
1da177e4 LT |
1399 | } |
1400 | ||
1401 | // | |
1402 | // initially this function was derived from minix or ext2's analog and | |
1403 | // evolved as the prototype did | |
1404 | // | |
1405 | ||
bd4c625c | 1406 | int reiserfs_init_locked_inode(struct inode *inode, void *p) |
1da177e4 | 1407 | { |
bd4c625c LT |
1408 | struct reiserfs_iget_args *args = (struct reiserfs_iget_args *)p; |
1409 | inode->i_ino = args->objectid; | |
1410 | INODE_PKEY(inode)->k_dir_id = cpu_to_le32(args->dirid); | |
1411 | return 0; | |
1da177e4 LT |
1412 | } |
1413 | ||
1414 | /* looks for stat data in the tree, and fills up the fields of in-core | |
1415 | inode stat data fields */ | |
bd4c625c LT |
1416 | void reiserfs_read_locked_inode(struct inode *inode, |
1417 | struct reiserfs_iget_args *args) | |
1da177e4 | 1418 | { |
bd4c625c LT |
1419 | INITIALIZE_PATH(path_to_sd); |
1420 | struct cpu_key key; | |
1421 | unsigned long dirino; | |
1422 | int retval; | |
1423 | ||
1424 | dirino = args->dirid; | |
1425 | ||
1426 | /* set version 1, version 2 could be used too, because stat data | |
1427 | key is the same in both versions */ | |
1428 | key.version = KEY_FORMAT_3_5; | |
1429 | key.on_disk_key.k_dir_id = dirino; | |
1430 | key.on_disk_key.k_objectid = inode->i_ino; | |
1431 | key.on_disk_key.k_offset = 0; | |
1432 | key.on_disk_key.k_type = 0; | |
1433 | ||
1434 | /* look for the object's stat data */ | |
1435 | retval = search_item(inode->i_sb, &key, &path_to_sd); | |
1436 | if (retval == IO_ERROR) { | |
1437 | reiserfs_warning(inode->i_sb, | |
1438 | "vs-13070: reiserfs_read_locked_inode: " | |
1439 | "i/o failure occurred trying to find stat data of %K", | |
1440 | &key); | |
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 | |
1459 | Gramoulle <philippe.gramoulle@mmania.com> reproduced it. | |
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) { | |
1470 | reiserfs_warning(inode->i_sb, | |
1471 | "vs-13075: reiserfs_read_locked_inode: " | |
1472 | "dead inode read from disk %K. " | |
1473 | "This is likely to be race with knfsd. Ignore", | |
1474 | &key); | |
1475 | reiserfs_make_bad_inode(inode); | |
1476 | } | |
1477 | ||
1478 | reiserfs_check_path(&path_to_sd); /* init inode should be relsing */ | |
1da177e4 LT |
1479 | |
1480 | } | |
1481 | ||
1482 | /** | |
1483 | * reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked(). | |
1484 | * | |
1485 | * @inode: inode from hash table to check | |
1486 | * @opaque: "cookie" passed to iget5_locked(). This is &reiserfs_iget_args. | |
1487 | * | |
1488 | * This function is called by iget5_locked() to distinguish reiserfs inodes | |
1489 | * having the same inode numbers. Such inodes can only exist due to some | |
1490 | * error condition. One of them should be bad. Inodes with identical | |
1491 | * inode numbers (objectids) are distinguished by parent directory ids. | |
1492 | * | |
1493 | */ | |
bd4c625c | 1494 | int reiserfs_find_actor(struct inode *inode, void *opaque) |
1da177e4 | 1495 | { |
bd4c625c | 1496 | struct reiserfs_iget_args *args; |
1da177e4 | 1497 | |
bd4c625c LT |
1498 | args = opaque; |
1499 | /* args is already in CPU order */ | |
1500 | return (inode->i_ino == args->objectid) && | |
1501 | (le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args->dirid); | |
1da177e4 LT |
1502 | } |
1503 | ||
bd4c625c | 1504 | struct inode *reiserfs_iget(struct super_block *s, const struct cpu_key *key) |
1da177e4 | 1505 | { |
bd4c625c LT |
1506 | struct inode *inode; |
1507 | struct reiserfs_iget_args args; | |
1508 | ||
1509 | args.objectid = key->on_disk_key.k_objectid; | |
1510 | args.dirid = key->on_disk_key.k_dir_id; | |
1511 | inode = iget5_locked(s, key->on_disk_key.k_objectid, | |
1512 | reiserfs_find_actor, reiserfs_init_locked_inode, | |
1513 | (void *)(&args)); | |
1514 | if (!inode) | |
1515 | return ERR_PTR(-ENOMEM); | |
1516 | ||
1517 | if (inode->i_state & I_NEW) { | |
1518 | reiserfs_read_locked_inode(inode, &args); | |
1519 | unlock_new_inode(inode); | |
1520 | } | |
1521 | ||
1522 | if (comp_short_keys(INODE_PKEY(inode), key) || is_bad_inode(inode)) { | |
1523 | /* either due to i/o error or a stale NFS handle */ | |
1524 | iput(inode); | |
1525 | inode = NULL; | |
1526 | } | |
1527 | return inode; | |
1da177e4 LT |
1528 | } |
1529 | ||
1530 | struct dentry *reiserfs_get_dentry(struct super_block *sb, void *vobjp) | |
1531 | { | |
bd4c625c LT |
1532 | __u32 *data = vobjp; |
1533 | struct cpu_key key; | |
1534 | struct dentry *result; | |
1535 | struct inode *inode; | |
1536 | ||
1537 | key.on_disk_key.k_objectid = data[0]; | |
1538 | key.on_disk_key.k_dir_id = data[1]; | |
1539 | reiserfs_write_lock(sb); | |
1540 | inode = reiserfs_iget(sb, &key); | |
1541 | if (inode && !IS_ERR(inode) && data[2] != 0 && | |
1542 | data[2] != inode->i_generation) { | |
1543 | iput(inode); | |
1544 | inode = NULL; | |
1545 | } | |
1546 | reiserfs_write_unlock(sb); | |
1547 | if (!inode) | |
1548 | inode = ERR_PTR(-ESTALE); | |
1549 | if (IS_ERR(inode)) | |
1550 | return ERR_PTR(PTR_ERR(inode)); | |
1551 | result = d_alloc_anon(inode); | |
1552 | if (!result) { | |
1553 | iput(inode); | |
1554 | return ERR_PTR(-ENOMEM); | |
1555 | } | |
1556 | return result; | |
1da177e4 LT |
1557 | } |
1558 | ||
bd4c625c LT |
1559 | struct dentry *reiserfs_decode_fh(struct super_block *sb, __u32 * data, |
1560 | int len, int fhtype, | |
1561 | int (*acceptable) (void *contect, | |
1562 | struct dentry * de), | |
1563 | void *context) | |
1564 | { | |
1565 | __u32 obj[3], parent[3]; | |
1566 | ||
1567 | /* fhtype happens to reflect the number of u32s encoded. | |
1568 | * due to a bug in earlier code, fhtype might indicate there | |
1569 | * are more u32s then actually fitted. | |
1570 | * so if fhtype seems to be more than len, reduce fhtype. | |
1571 | * Valid types are: | |
1572 | * 2 - objectid + dir_id - legacy support | |
1573 | * 3 - objectid + dir_id + generation | |
1574 | * 4 - objectid + dir_id + objectid and dirid of parent - legacy | |
1575 | * 5 - objectid + dir_id + generation + objectid and dirid of parent | |
1576 | * 6 - as above plus generation of directory | |
1577 | * 6 does not fit in NFSv2 handles | |
1578 | */ | |
1579 | if (fhtype > len) { | |
1580 | if (fhtype != 6 || len != 5) | |
1581 | reiserfs_warning(sb, | |
1582 | "nfsd/reiserfs, fhtype=%d, len=%d - odd", | |
1583 | fhtype, len); | |
1584 | fhtype = 5; | |
1585 | } | |
1586 | ||
1587 | obj[0] = data[0]; | |
1588 | obj[1] = data[1]; | |
1589 | if (fhtype == 3 || fhtype >= 5) | |
1590 | obj[2] = data[2]; | |
1591 | else | |
1592 | obj[2] = 0; /* generation number */ | |
1da177e4 | 1593 | |
bd4c625c LT |
1594 | if (fhtype >= 4) { |
1595 | parent[0] = data[fhtype >= 5 ? 3 : 2]; | |
1596 | parent[1] = data[fhtype >= 5 ? 4 : 3]; | |
1597 | if (fhtype == 6) | |
1598 | parent[2] = data[5]; | |
1599 | else | |
1600 | parent[2] = 0; | |
1601 | } | |
1602 | return sb->s_export_op->find_exported_dentry(sb, obj, | |
1603 | fhtype < 4 ? NULL : parent, | |
1604 | acceptable, context); | |
1da177e4 LT |
1605 | } |
1606 | ||
bd4c625c LT |
1607 | int reiserfs_encode_fh(struct dentry *dentry, __u32 * data, int *lenp, |
1608 | int need_parent) | |
1609 | { | |
1610 | struct inode *inode = dentry->d_inode; | |
1611 | int maxlen = *lenp; | |
1612 | ||
1613 | if (maxlen < 3) | |
1614 | return 255; | |
1615 | ||
1616 | data[0] = inode->i_ino; | |
1617 | data[1] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id); | |
1618 | data[2] = inode->i_generation; | |
1619 | *lenp = 3; | |
1620 | /* no room for directory info? return what we've stored so far */ | |
1621 | if (maxlen < 5 || !need_parent) | |
1622 | return 3; | |
1623 | ||
1624 | spin_lock(&dentry->d_lock); | |
1625 | inode = dentry->d_parent->d_inode; | |
1626 | data[3] = inode->i_ino; | |
1627 | data[4] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id); | |
1628 | *lenp = 5; | |
1629 | if (maxlen >= 6) { | |
1630 | data[5] = inode->i_generation; | |
1631 | *lenp = 6; | |
1632 | } | |
1633 | spin_unlock(&dentry->d_lock); | |
1634 | return *lenp; | |
1635 | } | |
1da177e4 LT |
1636 | |
1637 | /* looks for stat data, then copies fields to it, marks the buffer | |
1638 | containing stat data as dirty */ | |
1639 | /* reiserfs inodes are never really dirty, since the dirty inode call | |
1640 | ** always logs them. This call allows the VFS inode marking routines | |
1641 | ** to properly mark inodes for datasync and such, but only actually | |
1642 | ** does something when called for a synchronous update. | |
1643 | */ | |
bd4c625c LT |
1644 | int reiserfs_write_inode(struct inode *inode, int do_sync) |
1645 | { | |
1646 | struct reiserfs_transaction_handle th; | |
1647 | int jbegin_count = 1; | |
1648 | ||
1649 | if (inode->i_sb->s_flags & MS_RDONLY) | |
1650 | return -EROFS; | |
1651 | /* memory pressure can sometimes initiate write_inode calls with sync == 1, | |
1652 | ** these cases are just when the system needs ram, not when the | |
1653 | ** inode needs to reach disk for safety, and they can safely be | |
1654 | ** ignored because the altered inode has already been logged. | |
1655 | */ | |
1656 | if (do_sync && !(current->flags & PF_MEMALLOC)) { | |
1657 | reiserfs_write_lock(inode->i_sb); | |
1658 | if (!journal_begin(&th, inode->i_sb, jbegin_count)) { | |
1659 | reiserfs_update_sd(&th, inode); | |
1660 | journal_end_sync(&th, inode->i_sb, jbegin_count); | |
1661 | } | |
1662 | reiserfs_write_unlock(inode->i_sb); | |
1663 | } | |
1664 | return 0; | |
1da177e4 LT |
1665 | } |
1666 | ||
1667 | /* stat data of new object is inserted already, this inserts the item | |
1668 | containing "." and ".." entries */ | |
bd4c625c LT |
1669 | static int reiserfs_new_directory(struct reiserfs_transaction_handle *th, |
1670 | struct inode *inode, | |
1671 | struct item_head *ih, struct path *path, | |
1672 | struct inode *dir) | |
1da177e4 | 1673 | { |
bd4c625c LT |
1674 | struct super_block *sb = th->t_super; |
1675 | char empty_dir[EMPTY_DIR_SIZE]; | |
1676 | char *body = empty_dir; | |
1677 | struct cpu_key key; | |
1678 | int retval; | |
1679 | ||
1680 | BUG_ON(!th->t_trans_id); | |
1681 | ||
1682 | _make_cpu_key(&key, KEY_FORMAT_3_5, le32_to_cpu(ih->ih_key.k_dir_id), | |
1683 | le32_to_cpu(ih->ih_key.k_objectid), DOT_OFFSET, | |
1684 | TYPE_DIRENTRY, 3 /*key length */ ); | |
1685 | ||
1686 | /* compose item head for new item. Directories consist of items of | |
1687 | old type (ITEM_VERSION_1). Do not set key (second arg is 0), it | |
1688 | is done by reiserfs_new_inode */ | |
1689 | if (old_format_only(sb)) { | |
1690 | make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET, | |
1691 | TYPE_DIRENTRY, EMPTY_DIR_SIZE_V1, 2); | |
1692 | ||
1693 | make_empty_dir_item_v1(body, ih->ih_key.k_dir_id, | |
1694 | ih->ih_key.k_objectid, | |
1695 | INODE_PKEY(dir)->k_dir_id, | |
1696 | INODE_PKEY(dir)->k_objectid); | |
1697 | } else { | |
1698 | make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET, | |
1699 | TYPE_DIRENTRY, EMPTY_DIR_SIZE, 2); | |
1700 | ||
1701 | make_empty_dir_item(body, ih->ih_key.k_dir_id, | |
1702 | ih->ih_key.k_objectid, | |
1703 | INODE_PKEY(dir)->k_dir_id, | |
1704 | INODE_PKEY(dir)->k_objectid); | |
1705 | } | |
1706 | ||
1707 | /* look for place in the tree for new item */ | |
1708 | retval = search_item(sb, &key, path); | |
1709 | if (retval == IO_ERROR) { | |
1710 | reiserfs_warning(sb, "vs-13080: reiserfs_new_directory: " | |
1711 | "i/o failure occurred creating new directory"); | |
1712 | return -EIO; | |
1713 | } | |
1714 | if (retval == ITEM_FOUND) { | |
1715 | pathrelse(path); | |
1716 | reiserfs_warning(sb, "vs-13070: reiserfs_new_directory: " | |
1717 | "object with this key exists (%k)", | |
1718 | &(ih->ih_key)); | |
1719 | return -EEXIST; | |
1720 | } | |
1da177e4 | 1721 | |
bd4c625c LT |
1722 | /* insert item, that is empty directory item */ |
1723 | return reiserfs_insert_item(th, path, &key, ih, inode, body); | |
1724 | } | |
1da177e4 LT |
1725 | |
1726 | /* stat data of object has been inserted, this inserts the item | |
1727 | containing the body of symlink */ | |
bd4c625c LT |
1728 | static int reiserfs_new_symlink(struct reiserfs_transaction_handle *th, struct inode *inode, /* Inode of symlink */ |
1729 | struct item_head *ih, | |
1730 | struct path *path, const char *symname, | |
1731 | int item_len) | |
1da177e4 | 1732 | { |
bd4c625c LT |
1733 | struct super_block *sb = th->t_super; |
1734 | struct cpu_key key; | |
1735 | int retval; | |
1736 | ||
1737 | BUG_ON(!th->t_trans_id); | |
1738 | ||
1739 | _make_cpu_key(&key, KEY_FORMAT_3_5, | |
1740 | le32_to_cpu(ih->ih_key.k_dir_id), | |
1741 | le32_to_cpu(ih->ih_key.k_objectid), | |
1742 | 1, TYPE_DIRECT, 3 /*key length */ ); | |
1743 | ||
1744 | make_le_item_head(ih, NULL, KEY_FORMAT_3_5, 1, TYPE_DIRECT, item_len, | |
1745 | 0 /*free_space */ ); | |
1746 | ||
1747 | /* look for place in the tree for new item */ | |
1748 | retval = search_item(sb, &key, path); | |
1749 | if (retval == IO_ERROR) { | |
1750 | reiserfs_warning(sb, "vs-13080: reiserfs_new_symlinik: " | |
1751 | "i/o failure occurred creating new symlink"); | |
1752 | return -EIO; | |
1753 | } | |
1754 | if (retval == ITEM_FOUND) { | |
1755 | pathrelse(path); | |
1756 | reiserfs_warning(sb, "vs-13080: reiserfs_new_symlink: " | |
1757 | "object with this key exists (%k)", | |
1758 | &(ih->ih_key)); | |
1759 | return -EEXIST; | |
1760 | } | |
1da177e4 | 1761 | |
bd4c625c LT |
1762 | /* insert item, that is body of symlink */ |
1763 | return reiserfs_insert_item(th, path, &key, ih, inode, symname); | |
1764 | } | |
1da177e4 LT |
1765 | |
1766 | /* inserts the stat data into the tree, and then calls | |
1767 | reiserfs_new_directory (to insert ".", ".." item if new object is | |
1768 | directory) or reiserfs_new_symlink (to insert symlink body if new | |
1769 | object is symlink) or nothing (if new object is regular file) | |
1770 | ||
1771 | NOTE! uid and gid must already be set in the inode. If we return | |
1772 | non-zero due to an error, we have to drop the quota previously allocated | |
1773 | for the fresh inode. This can only be done outside a transaction, so | |
1774 | if we return non-zero, we also end the transaction. */ | |
bd4c625c LT |
1775 | int reiserfs_new_inode(struct reiserfs_transaction_handle *th, |
1776 | struct inode *dir, int mode, const char *symname, | |
1777 | /* 0 for regular, EMTRY_DIR_SIZE for dirs, | |
1778 | strlen (symname) for symlinks) */ | |
1779 | loff_t i_size, struct dentry *dentry, | |
1780 | struct inode *inode) | |
1da177e4 | 1781 | { |
bd4c625c LT |
1782 | struct super_block *sb; |
1783 | INITIALIZE_PATH(path_to_key); | |
1784 | struct cpu_key key; | |
1785 | struct item_head ih; | |
1786 | struct stat_data sd; | |
1787 | int retval; | |
1788 | int err; | |
1789 | ||
1790 | BUG_ON(!th->t_trans_id); | |
1791 | ||
1792 | if (DQUOT_ALLOC_INODE(inode)) { | |
1793 | err = -EDQUOT; | |
1794 | goto out_end_trans; | |
1795 | } | |
1796 | if (!dir || !dir->i_nlink) { | |
1797 | err = -EPERM; | |
1798 | goto out_bad_inode; | |
1799 | } | |
1800 | ||
1801 | sb = dir->i_sb; | |
1802 | ||
1803 | /* item head of new item */ | |
1804 | ih.ih_key.k_dir_id = reiserfs_choose_packing(dir); | |
1805 | ih.ih_key.k_objectid = cpu_to_le32(reiserfs_get_unused_objectid(th)); | |
1806 | if (!ih.ih_key.k_objectid) { | |
1807 | err = -ENOMEM; | |
1808 | goto out_bad_inode; | |
1809 | } | |
1810 | if (old_format_only(sb)) | |
1811 | /* not a perfect generation count, as object ids can be reused, but | |
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); | |
1850 | REISERFS_I(inode)->i_acl_access = NULL; | |
1851 | REISERFS_I(inode)->i_acl_default = NULL; | |
1852 | init_rwsem(&REISERFS_I(inode)->xattr_sem); | |
1853 | ||
1854 | if (old_format_only(sb)) | |
1855 | make_le_item_head(&ih, NULL, KEY_FORMAT_3_5, SD_OFFSET, | |
1856 | TYPE_STAT_DATA, SD_V1_SIZE, MAX_US_INT); | |
1857 | else | |
1858 | make_le_item_head(&ih, NULL, KEY_FORMAT_3_6, SD_OFFSET, | |
1859 | TYPE_STAT_DATA, SD_SIZE, MAX_US_INT); | |
1860 | ||
1861 | /* key to search for correct place for new stat data */ | |
1862 | _make_cpu_key(&key, KEY_FORMAT_3_6, le32_to_cpu(ih.ih_key.k_dir_id), | |
1863 | le32_to_cpu(ih.ih_key.k_objectid), SD_OFFSET, | |
1864 | TYPE_STAT_DATA, 3 /*key length */ ); | |
1865 | ||
1866 | /* find proper place for inserting of stat data */ | |
1867 | retval = search_item(sb, &key, &path_to_key); | |
1868 | if (retval == IO_ERROR) { | |
1869 | err = -EIO; | |
1870 | goto out_bad_inode; | |
1871 | } | |
1872 | if (retval == ITEM_FOUND) { | |
1873 | pathrelse(&path_to_key); | |
1874 | err = -EEXIST; | |
1875 | goto out_bad_inode; | |
1876 | } | |
1877 | if (old_format_only(sb)) { | |
1878 | if (inode->i_uid & ~0xffff || inode->i_gid & ~0xffff) { | |
1879 | pathrelse(&path_to_key); | |
1880 | /* i_uid or i_gid is too big to be stored in stat data v3.5 */ | |
1881 | err = -EINVAL; | |
1882 | goto out_bad_inode; | |
1883 | } | |
1884 | inode2sd_v1(&sd, inode, inode->i_size); | |
1885 | } else { | |
1886 | inode2sd(&sd, inode, inode->i_size); | |
1887 | } | |
1888 | // these do not go to on-disk stat data | |
1889 | inode->i_ino = le32_to_cpu(ih.ih_key.k_objectid); | |
1890 | inode->i_blksize = reiserfs_default_io_size; | |
1891 | ||
1892 | // store in in-core inode the key of stat data and version all | |
1893 | // object items will have (directory items will have old offset | |
1894 | // format, other new objects will consist of new items) | |
1895 | memcpy(INODE_PKEY(inode), &(ih.ih_key), KEY_SIZE); | |
1896 | if (old_format_only(sb) || S_ISDIR(mode) || S_ISLNK(mode)) | |
1897 | set_inode_item_key_version(inode, KEY_FORMAT_3_5); | |
1898 | else | |
1899 | set_inode_item_key_version(inode, KEY_FORMAT_3_6); | |
1900 | if (old_format_only(sb)) | |
1901 | set_inode_sd_version(inode, STAT_DATA_V1); | |
1902 | else | |
1903 | set_inode_sd_version(inode, STAT_DATA_V2); | |
1904 | ||
1905 | /* insert the stat data into the tree */ | |
1da177e4 | 1906 | #ifdef DISPLACE_NEW_PACKING_LOCALITIES |
bd4c625c LT |
1907 | if (REISERFS_I(dir)->new_packing_locality) |
1908 | th->displace_new_blocks = 1; | |
1da177e4 | 1909 | #endif |
bd4c625c LT |
1910 | retval = |
1911 | reiserfs_insert_item(th, &path_to_key, &key, &ih, inode, | |
1912 | (char *)(&sd)); | |
1913 | if (retval) { | |
1914 | err = retval; | |
1915 | reiserfs_check_path(&path_to_key); | |
1916 | goto out_bad_inode; | |
1917 | } | |
1da177e4 | 1918 | #ifdef DISPLACE_NEW_PACKING_LOCALITIES |
bd4c625c LT |
1919 | if (!th->displace_new_blocks) |
1920 | REISERFS_I(dir)->new_packing_locality = 0; | |
1da177e4 | 1921 | #endif |
bd4c625c LT |
1922 | if (S_ISDIR(mode)) { |
1923 | /* insert item with "." and ".." */ | |
1924 | retval = | |
1925 | reiserfs_new_directory(th, inode, &ih, &path_to_key, dir); | |
1926 | } | |
1927 | ||
1928 | if (S_ISLNK(mode)) { | |
1929 | /* insert body of symlink */ | |
1930 | if (!old_format_only(sb)) | |
1931 | i_size = ROUND_UP(i_size); | |
1932 | retval = | |
1933 | reiserfs_new_symlink(th, inode, &ih, &path_to_key, symname, | |
1934 | i_size); | |
1935 | } | |
1936 | if (retval) { | |
1937 | err = retval; | |
1938 | reiserfs_check_path(&path_to_key); | |
1939 | journal_end(th, th->t_super, th->t_blocks_allocated); | |
1940 | goto out_inserted_sd; | |
1941 | } | |
1942 | ||
1943 | /* XXX CHECK THIS */ | |
1944 | if (reiserfs_posixacl(inode->i_sb)) { | |
1945 | retval = reiserfs_inherit_default_acl(dir, dentry, inode); | |
1946 | if (retval) { | |
1947 | err = retval; | |
1948 | reiserfs_check_path(&path_to_key); | |
1949 | journal_end(th, th->t_super, th->t_blocks_allocated); | |
1950 | goto out_inserted_sd; | |
1951 | } | |
1952 | } else if (inode->i_sb->s_flags & MS_POSIXACL) { | |
1953 | reiserfs_warning(inode->i_sb, "ACLs aren't enabled in the fs, " | |
1954 | "but vfs thinks they are!"); | |
1955 | } else if (is_reiserfs_priv_object(dir)) { | |
1956 | reiserfs_mark_inode_private(inode); | |
1957 | } | |
1958 | ||
1959 | insert_inode_hash(inode); | |
1960 | reiserfs_update_sd(th, inode); | |
1961 | reiserfs_check_path(&path_to_key); | |
1962 | ||
1963 | return 0; | |
1da177e4 LT |
1964 | |
1965 | /* it looks like you can easily compress these two goto targets into | |
1966 | * one. Keeping it like this doesn't actually hurt anything, and they | |
1967 | * are place holders for what the quota code actually needs. | |
1968 | */ | |
bd4c625c LT |
1969 | out_bad_inode: |
1970 | /* Invalidate the object, nothing was inserted yet */ | |
1971 | INODE_PKEY(inode)->k_objectid = 0; | |
1972 | ||
1973 | /* Quota change must be inside a transaction for journaling */ | |
1974 | DQUOT_FREE_INODE(inode); | |
1975 | ||
1976 | out_end_trans: | |
1977 | journal_end(th, th->t_super, th->t_blocks_allocated); | |
1978 | /* Drop can be outside and it needs more credits so it's better to have it outside */ | |
1979 | DQUOT_DROP(inode); | |
1980 | inode->i_flags |= S_NOQUOTA; | |
1981 | make_bad_inode(inode); | |
1982 | ||
1983 | out_inserted_sd: | |
1984 | inode->i_nlink = 0; | |
1985 | th->t_trans_id = 0; /* so the caller can't use this handle later */ | |
b3bb8afd JM |
1986 | |
1987 | /* If we were inheriting an ACL, we need to release the lock so that | |
1988 | * iput doesn't deadlock in reiserfs_delete_xattrs. The locking | |
1989 | * code really needs to be reworked, but this will take care of it | |
1990 | * for now. -jeffm */ | |
d86c390f | 1991 | if (REISERFS_I(dir)->i_acl_default && !IS_ERR(REISERFS_I(dir)->i_acl_default)) { |
b3bb8afd JM |
1992 | reiserfs_write_unlock_xattrs(dir->i_sb); |
1993 | iput(inode); | |
1994 | reiserfs_write_lock_xattrs(dir->i_sb); | |
1995 | } else | |
1996 | iput(inode); | |
bd4c625c | 1997 | return err; |
1da177e4 LT |
1998 | } |
1999 | ||
2000 | /* | |
2001 | ** finds the tail page in the page cache, | |
2002 | ** reads the last block in. | |
2003 | ** | |
2004 | ** On success, page_result is set to a locked, pinned page, and bh_result | |
2005 | ** is set to an up to date buffer for the last block in the file. returns 0. | |
2006 | ** | |
2007 | ** tail conversion is not done, so bh_result might not be valid for writing | |
2008 | ** check buffer_mapped(bh_result) and bh_result->b_blocknr != 0 before | |
2009 | ** trying to write the block. | |
2010 | ** | |
2011 | ** on failure, nonzero is returned, page_result and bh_result are untouched. | |
2012 | */ | |
bd4c625c LT |
2013 | static int grab_tail_page(struct inode *p_s_inode, |
2014 | struct page **page_result, | |
2015 | struct buffer_head **bh_result) | |
2016 | { | |
2017 | ||
2018 | /* we want the page with the last byte in the file, | |
2019 | ** not the page that will hold the next byte for appending | |
2020 | */ | |
2021 | unsigned long index = (p_s_inode->i_size - 1) >> PAGE_CACHE_SHIFT; | |
2022 | unsigned long pos = 0; | |
2023 | unsigned long start = 0; | |
2024 | unsigned long blocksize = p_s_inode->i_sb->s_blocksize; | |
2025 | unsigned long offset = (p_s_inode->i_size) & (PAGE_CACHE_SIZE - 1); | |
2026 | struct buffer_head *bh; | |
2027 | struct buffer_head *head; | |
2028 | struct page *page; | |
2029 | int error; | |
2030 | ||
2031 | /* we know that we are only called with inode->i_size > 0. | |
2032 | ** we also know that a file tail can never be as big as a block | |
2033 | ** If i_size % blocksize == 0, our file is currently block aligned | |
2034 | ** and it won't need converting or zeroing after a truncate. | |
2035 | */ | |
2036 | if ((offset & (blocksize - 1)) == 0) { | |
2037 | return -ENOENT; | |
2038 | } | |
2039 | page = grab_cache_page(p_s_inode->i_mapping, index); | |
2040 | error = -ENOMEM; | |
2041 | if (!page) { | |
2042 | goto out; | |
2043 | } | |
2044 | /* start within the page of the last block in the file */ | |
2045 | start = (offset / blocksize) * blocksize; | |
2046 | ||
2047 | error = block_prepare_write(page, start, offset, | |
2048 | reiserfs_get_block_create_0); | |
2049 | if (error) | |
2050 | goto unlock; | |
2051 | ||
2052 | head = page_buffers(page); | |
2053 | bh = head; | |
2054 | do { | |
2055 | if (pos >= start) { | |
2056 | break; | |
2057 | } | |
2058 | bh = bh->b_this_page; | |
2059 | pos += blocksize; | |
2060 | } while (bh != head); | |
2061 | ||
2062 | if (!buffer_uptodate(bh)) { | |
2063 | /* note, this should never happen, prepare_write should | |
2064 | ** be taking care of this for us. If the buffer isn't up to date, | |
2065 | ** I've screwed up the code to find the buffer, or the code to | |
2066 | ** call prepare_write | |
2067 | */ | |
2068 | reiserfs_warning(p_s_inode->i_sb, | |
2069 | "clm-6000: error reading block %lu on dev %s", | |
2070 | bh->b_blocknr, | |
2071 | reiserfs_bdevname(p_s_inode->i_sb)); | |
2072 | error = -EIO; | |
2073 | goto unlock; | |
2074 | } | |
2075 | *bh_result = bh; | |
2076 | *page_result = page; | |
2077 | ||
2078 | out: | |
2079 | return error; | |
2080 | ||
2081 | unlock: | |
2082 | unlock_page(page); | |
2083 | page_cache_release(page); | |
2084 | return error; | |
1da177e4 LT |
2085 | } |
2086 | ||
2087 | /* | |
2088 | ** vfs version of truncate file. Must NOT be called with | |
2089 | ** a transaction already started. | |
2090 | ** | |
2091 | ** some code taken from block_truncate_page | |
2092 | */ | |
bd4c625c LT |
2093 | int reiserfs_truncate_file(struct inode *p_s_inode, int update_timestamps) |
2094 | { | |
2095 | struct reiserfs_transaction_handle th; | |
2096 | /* we want the offset for the first byte after the end of the file */ | |
2097 | unsigned long offset = p_s_inode->i_size & (PAGE_CACHE_SIZE - 1); | |
2098 | unsigned blocksize = p_s_inode->i_sb->s_blocksize; | |
2099 | unsigned length; | |
2100 | struct page *page = NULL; | |
2101 | int error; | |
2102 | struct buffer_head *bh = NULL; | |
24996049 | 2103 | int err2; |
bd4c625c LT |
2104 | |
2105 | reiserfs_write_lock(p_s_inode->i_sb); | |
2106 | ||
2107 | if (p_s_inode->i_size > 0) { | |
2108 | if ((error = grab_tail_page(p_s_inode, &page, &bh))) { | |
2109 | // -ENOENT means we truncated past the end of the file, | |
2110 | // and get_block_create_0 could not find a block to read in, | |
2111 | // which is ok. | |
2112 | if (error != -ENOENT) | |
2113 | reiserfs_warning(p_s_inode->i_sb, | |
2114 | "clm-6001: grab_tail_page failed %d", | |
2115 | error); | |
2116 | page = NULL; | |
2117 | bh = NULL; | |
2118 | } | |
2119 | } | |
1da177e4 | 2120 | |
bd4c625c LT |
2121 | /* so, if page != NULL, we have a buffer head for the offset at |
2122 | ** the end of the file. if the bh is mapped, and bh->b_blocknr != 0, | |
2123 | ** then we have an unformatted node. Otherwise, we have a direct item, | |
2124 | ** and no zeroing is required on disk. We zero after the truncate, | |
2125 | ** because the truncate might pack the item anyway | |
2126 | ** (it will unmap bh if it packs). | |
1da177e4 | 2127 | */ |
bd4c625c LT |
2128 | /* it is enough to reserve space in transaction for 2 balancings: |
2129 | one for "save" link adding and another for the first | |
2130 | cut_from_item. 1 is for update_sd */ | |
2131 | error = journal_begin(&th, p_s_inode->i_sb, | |
2132 | JOURNAL_PER_BALANCE_CNT * 2 + 1); | |
2133 | if (error) | |
2134 | goto out; | |
2135 | reiserfs_update_inode_transaction(p_s_inode); | |
2136 | if (update_timestamps) | |
2137 | /* we are doing real truncate: if the system crashes before the last | |
2138 | transaction of truncating gets committed - on reboot the file | |
2139 | either appears truncated properly or not truncated at all */ | |
2140 | add_save_link(&th, p_s_inode, 1); | |
24996049 | 2141 | err2 = reiserfs_do_truncate(&th, p_s_inode, page, update_timestamps); |
bd4c625c LT |
2142 | error = |
2143 | journal_end(&th, p_s_inode->i_sb, JOURNAL_PER_BALANCE_CNT * 2 + 1); | |
2144 | if (error) | |
2145 | goto out; | |
2146 | ||
24996049 JM |
2147 | /* check reiserfs_do_truncate after ending the transaction */ |
2148 | if (err2) { | |
2149 | error = err2; | |
2150 | goto out; | |
2151 | } | |
2152 | ||
bd4c625c LT |
2153 | if (update_timestamps) { |
2154 | error = remove_save_link(p_s_inode, 1 /* truncate */ ); | |
2155 | if (error) | |
2156 | goto out; | |
2157 | } | |
2158 | ||
2159 | if (page) { | |
2160 | length = offset & (blocksize - 1); | |
2161 | /* if we are not on a block boundary */ | |
2162 | if (length) { | |
2163 | char *kaddr; | |
2164 | ||
2165 | length = blocksize - length; | |
2166 | kaddr = kmap_atomic(page, KM_USER0); | |
2167 | memset(kaddr + offset, 0, length); | |
2168 | flush_dcache_page(page); | |
2169 | kunmap_atomic(kaddr, KM_USER0); | |
2170 | if (buffer_mapped(bh) && bh->b_blocknr != 0) { | |
2171 | mark_buffer_dirty(bh); | |
2172 | } | |
2173 | } | |
2174 | unlock_page(page); | |
2175 | page_cache_release(page); | |
2176 | } | |
2177 | ||
2178 | reiserfs_write_unlock(p_s_inode->i_sb); | |
2179 | return 0; | |
2180 | out: | |
2181 | if (page) { | |
2182 | unlock_page(page); | |
2183 | page_cache_release(page); | |
2184 | } | |
2185 | reiserfs_write_unlock(p_s_inode->i_sb); | |
2186 | return error; | |
2187 | } | |
2188 | ||
2189 | static int map_block_for_writepage(struct inode *inode, | |
2190 | struct buffer_head *bh_result, | |
2191 | unsigned long block) | |
2192 | { | |
2193 | struct reiserfs_transaction_handle th; | |
2194 | int fs_gen; | |
2195 | struct item_head tmp_ih; | |
2196 | struct item_head *ih; | |
2197 | struct buffer_head *bh; | |
2198 | __le32 *item; | |
2199 | struct cpu_key key; | |
2200 | INITIALIZE_PATH(path); | |
2201 | int pos_in_item; | |
2202 | int jbegin_count = JOURNAL_PER_BALANCE_CNT; | |
7729ac5e | 2203 | loff_t byte_offset = ((loff_t)block << inode->i_sb->s_blocksize_bits)+1; |
bd4c625c LT |
2204 | int retval; |
2205 | int use_get_block = 0; | |
2206 | int bytes_copied = 0; | |
2207 | int copy_size; | |
2208 | int trans_running = 0; | |
2209 | ||
2210 | /* catch places below that try to log something without starting a trans */ | |
2211 | th.t_trans_id = 0; | |
2212 | ||
2213 | if (!buffer_uptodate(bh_result)) { | |
2214 | return -EIO; | |
2215 | } | |
2216 | ||
2217 | kmap(bh_result->b_page); | |
2218 | start_over: | |
2219 | reiserfs_write_lock(inode->i_sb); | |
2220 | make_cpu_key(&key, inode, byte_offset, TYPE_ANY, 3); | |
2221 | ||
2222 | research: | |
2223 | retval = search_for_position_by_key(inode->i_sb, &key, &path); | |
2224 | if (retval != POSITION_FOUND) { | |
2225 | use_get_block = 1; | |
2226 | goto out; | |
2227 | } | |
2228 | ||
2229 | bh = get_last_bh(&path); | |
2230 | ih = get_ih(&path); | |
2231 | item = get_item(&path); | |
2232 | pos_in_item = path.pos_in_item; | |
2233 | ||
2234 | /* we've found an unformatted node */ | |
2235 | if (indirect_item_found(retval, ih)) { | |
2236 | if (bytes_copied > 0) { | |
2237 | reiserfs_warning(inode->i_sb, | |
2238 | "clm-6002: bytes_copied %d", | |
2239 | bytes_copied); | |
2240 | } | |
2241 | if (!get_block_num(item, pos_in_item)) { | |
2242 | /* crap, we are writing to a hole */ | |
2243 | use_get_block = 1; | |
2244 | goto out; | |
2245 | } | |
2246 | set_block_dev_mapped(bh_result, | |
2247 | get_block_num(item, pos_in_item), inode); | |
2248 | } else if (is_direct_le_ih(ih)) { | |
2249 | char *p; | |
2250 | p = page_address(bh_result->b_page); | |
2251 | p += (byte_offset - 1) & (PAGE_CACHE_SIZE - 1); | |
2252 | copy_size = ih_item_len(ih) - pos_in_item; | |
2253 | ||
2254 | fs_gen = get_generation(inode->i_sb); | |
2255 | copy_item_head(&tmp_ih, ih); | |
2256 | ||
2257 | if (!trans_running) { | |
2258 | /* vs-3050 is gone, no need to drop the path */ | |
2259 | retval = journal_begin(&th, inode->i_sb, jbegin_count); | |
2260 | if (retval) | |
2261 | goto out; | |
2262 | reiserfs_update_inode_transaction(inode); | |
2263 | trans_running = 1; | |
2264 | if (fs_changed(fs_gen, inode->i_sb) | |
2265 | && item_moved(&tmp_ih, &path)) { | |
2266 | reiserfs_restore_prepared_buffer(inode->i_sb, | |
2267 | bh); | |
2268 | goto research; | |
2269 | } | |
2270 | } | |
2271 | ||
2272 | reiserfs_prepare_for_journal(inode->i_sb, bh, 1); | |
2273 | ||
2274 | if (fs_changed(fs_gen, inode->i_sb) | |
2275 | && item_moved(&tmp_ih, &path)) { | |
2276 | reiserfs_restore_prepared_buffer(inode->i_sb, bh); | |
2277 | goto research; | |
2278 | } | |
2279 | ||
2280 | memcpy(B_I_PITEM(bh, ih) + pos_in_item, p + bytes_copied, | |
2281 | copy_size); | |
2282 | ||
2283 | journal_mark_dirty(&th, inode->i_sb, bh); | |
2284 | bytes_copied += copy_size; | |
2285 | set_block_dev_mapped(bh_result, 0, inode); | |
2286 | ||
2287 | /* are there still bytes left? */ | |
2288 | if (bytes_copied < bh_result->b_size && | |
2289 | (byte_offset + bytes_copied) < inode->i_size) { | |
2290 | set_cpu_key_k_offset(&key, | |
2291 | cpu_key_k_offset(&key) + | |
2292 | copy_size); | |
2293 | goto research; | |
2294 | } | |
2295 | } else { | |
2296 | reiserfs_warning(inode->i_sb, | |
2297 | "clm-6003: bad item inode %lu, device %s", | |
2298 | inode->i_ino, reiserfs_bdevname(inode->i_sb)); | |
2299 | retval = -EIO; | |
2300 | goto out; | |
2301 | } | |
2302 | retval = 0; | |
2303 | ||
2304 | out: | |
2305 | pathrelse(&path); | |
2306 | if (trans_running) { | |
2307 | int err = journal_end(&th, inode->i_sb, jbegin_count); | |
2308 | if (err) | |
2309 | retval = err; | |
2310 | trans_running = 0; | |
2311 | } | |
2312 | reiserfs_write_unlock(inode->i_sb); | |
2313 | ||
2314 | /* this is where we fill in holes in the file. */ | |
2315 | if (use_get_block) { | |
2316 | retval = reiserfs_get_block(inode, block, bh_result, | |
1b1dcc1b | 2317 | GET_BLOCK_CREATE | GET_BLOCK_NO_IMUX |
bd4c625c LT |
2318 | | GET_BLOCK_NO_DANGLE); |
2319 | if (!retval) { | |
2320 | if (!buffer_mapped(bh_result) | |
2321 | || bh_result->b_blocknr == 0) { | |
2322 | /* get_block failed to find a mapped unformatted node. */ | |
2323 | use_get_block = 0; | |
2324 | goto start_over; | |
2325 | } | |
2326 | } | |
2327 | } | |
2328 | kunmap(bh_result->b_page); | |
2329 | ||
2330 | if (!retval && buffer_mapped(bh_result) && bh_result->b_blocknr == 0) { | |
2331 | /* we've copied data from the page into the direct item, so the | |
2332 | * buffer in the page is now clean, mark it to reflect that. | |
2333 | */ | |
2334 | lock_buffer(bh_result); | |
2335 | clear_buffer_dirty(bh_result); | |
2336 | unlock_buffer(bh_result); | |
2337 | } | |
2338 | return retval; | |
1da177e4 LT |
2339 | } |
2340 | ||
2341 | /* | |
2342 | * mason@suse.com: updated in 2.5.54 to follow the same general io | |
2343 | * start/recovery path as __block_write_full_page, along with special | |
2344 | * code to handle reiserfs tails. | |
2345 | */ | |
bd4c625c LT |
2346 | static int reiserfs_write_full_page(struct page *page, |
2347 | struct writeback_control *wbc) | |
2348 | { | |
2349 | struct inode *inode = page->mapping->host; | |
2350 | unsigned long end_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
2351 | int error = 0; | |
2352 | unsigned long block; | |
2353 | struct buffer_head *head, *bh; | |
2354 | int partial = 0; | |
2355 | int nr = 0; | |
2356 | int checked = PageChecked(page); | |
2357 | struct reiserfs_transaction_handle th; | |
2358 | struct super_block *s = inode->i_sb; | |
2359 | int bh_per_page = PAGE_CACHE_SIZE / s->s_blocksize; | |
2360 | th.t_trans_id = 0; | |
2361 | ||
e0e851cf CM |
2362 | /* no logging allowed when nonblocking or from PF_MEMALLOC */ |
2363 | if (checked && (current->flags & PF_MEMALLOC)) { | |
2364 | redirty_page_for_writepage(wbc, page); | |
2365 | unlock_page(page); | |
2366 | return 0; | |
2367 | } | |
2368 | ||
bd4c625c LT |
2369 | /* The page dirty bit is cleared before writepage is called, which |
2370 | * means we have to tell create_empty_buffers to make dirty buffers | |
2371 | * The page really should be up to date at this point, so tossing | |
2372 | * in the BH_Uptodate is just a sanity check. | |
2373 | */ | |
2374 | if (!page_has_buffers(page)) { | |
2375 | create_empty_buffers(page, s->s_blocksize, | |
2376 | (1 << BH_Dirty) | (1 << BH_Uptodate)); | |
2377 | } | |
2378 | head = page_buffers(page); | |
1da177e4 | 2379 | |
bd4c625c LT |
2380 | /* last page in the file, zero out any contents past the |
2381 | ** last byte in the file | |
2382 | */ | |
2383 | if (page->index >= end_index) { | |
2384 | char *kaddr; | |
2385 | unsigned last_offset; | |
2386 | ||
2387 | last_offset = inode->i_size & (PAGE_CACHE_SIZE - 1); | |
2388 | /* no file contents in this page */ | |
2389 | if (page->index >= end_index + 1 || !last_offset) { | |
2390 | unlock_page(page); | |
2391 | return 0; | |
2392 | } | |
2393 | kaddr = kmap_atomic(page, KM_USER0); | |
2394 | memset(kaddr + last_offset, 0, PAGE_CACHE_SIZE - last_offset); | |
2395 | flush_dcache_page(page); | |
2396 | kunmap_atomic(kaddr, KM_USER0); | |
1da177e4 | 2397 | } |
bd4c625c LT |
2398 | bh = head; |
2399 | block = page->index << (PAGE_CACHE_SHIFT - s->s_blocksize_bits); | |
2400 | /* first map all the buffers, logging any direct items we find */ | |
2401 | do { | |
2402 | if ((checked || buffer_dirty(bh)) && (!buffer_mapped(bh) || | |
2403 | (buffer_mapped(bh) | |
2404 | && bh->b_blocknr == | |
2405 | 0))) { | |
2406 | /* not mapped yet, or it points to a direct item, search | |
2407 | * the btree for the mapping info, and log any direct | |
2408 | * items found | |
2409 | */ | |
2410 | if ((error = map_block_for_writepage(inode, bh, block))) { | |
2411 | goto fail; | |
2412 | } | |
2413 | } | |
2414 | bh = bh->b_this_page; | |
2415 | block++; | |
2416 | } while (bh != head); | |
2417 | ||
2418 | /* | |
2419 | * we start the transaction after map_block_for_writepage, | |
2420 | * because it can create holes in the file (an unbounded operation). | |
2421 | * starting it here, we can make a reliable estimate for how many | |
2422 | * blocks we're going to log | |
1da177e4 | 2423 | */ |
bd4c625c LT |
2424 | if (checked) { |
2425 | ClearPageChecked(page); | |
2426 | reiserfs_write_lock(s); | |
2427 | error = journal_begin(&th, s, bh_per_page + 1); | |
2428 | if (error) { | |
2429 | reiserfs_write_unlock(s); | |
2430 | goto fail; | |
2431 | } | |
2432 | reiserfs_update_inode_transaction(inode); | |
1da177e4 | 2433 | } |
bd4c625c LT |
2434 | /* now go through and lock any dirty buffers on the page */ |
2435 | do { | |
2436 | get_bh(bh); | |
2437 | if (!buffer_mapped(bh)) | |
2438 | continue; | |
2439 | if (buffer_mapped(bh) && bh->b_blocknr == 0) | |
2440 | continue; | |
2441 | ||
2442 | if (checked) { | |
2443 | reiserfs_prepare_for_journal(s, bh, 1); | |
2444 | journal_mark_dirty(&th, s, bh); | |
2445 | continue; | |
2446 | } | |
2447 | /* from this point on, we know the buffer is mapped to a | |
2448 | * real block and not a direct item | |
2449 | */ | |
2450 | if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) { | |
2451 | lock_buffer(bh); | |
2452 | } else { | |
2453 | if (test_set_buffer_locked(bh)) { | |
2454 | redirty_page_for_writepage(wbc, page); | |
2455 | continue; | |
2456 | } | |
2457 | } | |
2458 | if (test_clear_buffer_dirty(bh)) { | |
2459 | mark_buffer_async_write(bh); | |
2460 | } else { | |
2461 | unlock_buffer(bh); | |
2462 | } | |
2463 | } while ((bh = bh->b_this_page) != head); | |
2464 | ||
2465 | if (checked) { | |
2466 | error = journal_end(&th, s, bh_per_page + 1); | |
2467 | reiserfs_write_unlock(s); | |
2468 | if (error) | |
2469 | goto fail; | |
1da177e4 | 2470 | } |
bd4c625c LT |
2471 | BUG_ON(PageWriteback(page)); |
2472 | set_page_writeback(page); | |
2473 | unlock_page(page); | |
1da177e4 | 2474 | |
bd4c625c LT |
2475 | /* |
2476 | * since any buffer might be the only dirty buffer on the page, | |
2477 | * the first submit_bh can bring the page out of writeback. | |
2478 | * be careful with the buffers. | |
1da177e4 | 2479 | */ |
1da177e4 | 2480 | do { |
bd4c625c LT |
2481 | struct buffer_head *next = bh->b_this_page; |
2482 | if (buffer_async_write(bh)) { | |
2483 | submit_bh(WRITE, bh); | |
2484 | nr++; | |
2485 | } | |
2486 | put_bh(bh); | |
2487 | bh = next; | |
2488 | } while (bh != head); | |
1da177e4 | 2489 | |
bd4c625c LT |
2490 | error = 0; |
2491 | done: | |
2492 | if (nr == 0) { | |
2493 | /* | |
2494 | * if this page only had a direct item, it is very possible for | |
2495 | * no io to be required without there being an error. Or, | |
2496 | * someone else could have locked them and sent them down the | |
2497 | * pipe without locking the page | |
2498 | */ | |
2499 | bh = head; | |
2500 | do { | |
2501 | if (!buffer_uptodate(bh)) { | |
2502 | partial = 1; | |
2503 | break; | |
2504 | } | |
2505 | bh = bh->b_this_page; | |
2506 | } while (bh != head); | |
2507 | if (!partial) | |
2508 | SetPageUptodate(page); | |
2509 | end_page_writeback(page); | |
2510 | } | |
2511 | return error; | |
1da177e4 | 2512 | |
bd4c625c LT |
2513 | fail: |
2514 | /* catches various errors, we need to make sure any valid dirty blocks | |
2515 | * get to the media. The page is currently locked and not marked for | |
2516 | * writeback | |
2517 | */ | |
2518 | ClearPageUptodate(page); | |
2519 | bh = head; | |
2520 | do { | |
2521 | get_bh(bh); | |
2522 | if (buffer_mapped(bh) && buffer_dirty(bh) && bh->b_blocknr) { | |
2523 | lock_buffer(bh); | |
2524 | mark_buffer_async_write(bh); | |
2525 | } else { | |
2526 | /* | |
2527 | * clear any dirty bits that might have come from getting | |
2528 | * attached to a dirty page | |
2529 | */ | |
2530 | clear_buffer_dirty(bh); | |
2531 | } | |
2532 | bh = bh->b_this_page; | |
2533 | } while (bh != head); | |
2534 | SetPageError(page); | |
2535 | BUG_ON(PageWriteback(page)); | |
2536 | set_page_writeback(page); | |
2537 | unlock_page(page); | |
2538 | do { | |
2539 | struct buffer_head *next = bh->b_this_page; | |
2540 | if (buffer_async_write(bh)) { | |
2541 | clear_buffer_dirty(bh); | |
2542 | submit_bh(WRITE, bh); | |
2543 | nr++; | |
2544 | } | |
2545 | put_bh(bh); | |
2546 | bh = next; | |
2547 | } while (bh != head); | |
2548 | goto done; | |
1da177e4 LT |
2549 | } |
2550 | ||
bd4c625c LT |
2551 | static int reiserfs_readpage(struct file *f, struct page *page) |
2552 | { | |
2553 | return block_read_full_page(page, reiserfs_get_block); | |
2554 | } | |
1da177e4 | 2555 | |
bd4c625c | 2556 | static int reiserfs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 | 2557 | { |
bd4c625c LT |
2558 | struct inode *inode = page->mapping->host; |
2559 | reiserfs_wait_on_write_block(inode->i_sb); | |
2560 | return reiserfs_write_full_page(page, wbc); | |
1da177e4 LT |
2561 | } |
2562 | ||
2563 | static int reiserfs_prepare_write(struct file *f, struct page *page, | |
bd4c625c LT |
2564 | unsigned from, unsigned to) |
2565 | { | |
2566 | struct inode *inode = page->mapping->host; | |
2567 | int ret; | |
2568 | int old_ref = 0; | |
2569 | ||
2570 | reiserfs_wait_on_write_block(inode->i_sb); | |
2571 | fix_tail_page_for_writing(page); | |
2572 | if (reiserfs_transaction_running(inode->i_sb)) { | |
2573 | struct reiserfs_transaction_handle *th; | |
2574 | th = (struct reiserfs_transaction_handle *)current-> | |
2575 | journal_info; | |
2576 | BUG_ON(!th->t_refcount); | |
2577 | BUG_ON(!th->t_trans_id); | |
2578 | old_ref = th->t_refcount; | |
2579 | th->t_refcount++; | |
1da177e4 | 2580 | } |
1da177e4 | 2581 | |
bd4c625c LT |
2582 | ret = block_prepare_write(page, from, to, reiserfs_get_block); |
2583 | if (ret && reiserfs_transaction_running(inode->i_sb)) { | |
2584 | struct reiserfs_transaction_handle *th = current->journal_info; | |
2585 | /* this gets a little ugly. If reiserfs_get_block returned an | |
2586 | * error and left a transacstion running, we've got to close it, | |
2587 | * and we've got to free handle if it was a persistent transaction. | |
2588 | * | |
2589 | * But, if we had nested into an existing transaction, we need | |
2590 | * to just drop the ref count on the handle. | |
2591 | * | |
2592 | * If old_ref == 0, the transaction is from reiserfs_get_block, | |
2593 | * and it was a persistent trans. Otherwise, it was nested above. | |
2594 | */ | |
2595 | if (th->t_refcount > old_ref) { | |
2596 | if (old_ref) | |
2597 | th->t_refcount--; | |
2598 | else { | |
2599 | int err; | |
2600 | reiserfs_write_lock(inode->i_sb); | |
2601 | err = reiserfs_end_persistent_transaction(th); | |
2602 | reiserfs_write_unlock(inode->i_sb); | |
2603 | if (err) | |
2604 | ret = err; | |
2605 | } | |
2606 | } | |
2607 | } | |
2608 | return ret; | |
1da177e4 | 2609 | |
bd4c625c | 2610 | } |
1da177e4 | 2611 | |
bd4c625c LT |
2612 | static sector_t reiserfs_aop_bmap(struct address_space *as, sector_t block) |
2613 | { | |
2614 | return generic_block_bmap(as, block, reiserfs_bmap); | |
1da177e4 LT |
2615 | } |
2616 | ||
bd4c625c LT |
2617 | static int reiserfs_commit_write(struct file *f, struct page *page, |
2618 | unsigned from, unsigned to) | |
2619 | { | |
2620 | struct inode *inode = page->mapping->host; | |
2621 | loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + to; | |
2622 | int ret = 0; | |
2623 | int update_sd = 0; | |
2624 | struct reiserfs_transaction_handle *th = NULL; | |
2625 | ||
2626 | reiserfs_wait_on_write_block(inode->i_sb); | |
2627 | if (reiserfs_transaction_running(inode->i_sb)) { | |
2628 | th = current->journal_info; | |
2629 | } | |
2630 | reiserfs_commit_page(inode, page, from, to); | |
1da177e4 | 2631 | |
bd4c625c LT |
2632 | /* generic_commit_write does this for us, but does not update the |
2633 | ** transaction tracking stuff when the size changes. So, we have | |
2634 | ** to do the i_size updates here. | |
2635 | */ | |
2636 | if (pos > inode->i_size) { | |
2637 | struct reiserfs_transaction_handle myth; | |
2638 | reiserfs_write_lock(inode->i_sb); | |
2639 | /* If the file have grown beyond the border where it | |
2640 | can have a tail, unmark it as needing a tail | |
2641 | packing */ | |
2642 | if ((have_large_tails(inode->i_sb) | |
2643 | && inode->i_size > i_block_size(inode) * 4) | |
2644 | || (have_small_tails(inode->i_sb) | |
2645 | && inode->i_size > i_block_size(inode))) | |
2646 | REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask; | |
2647 | ||
2648 | ret = journal_begin(&myth, inode->i_sb, 1); | |
2649 | if (ret) { | |
2650 | reiserfs_write_unlock(inode->i_sb); | |
2651 | goto journal_error; | |
2652 | } | |
2653 | reiserfs_update_inode_transaction(inode); | |
2654 | inode->i_size = pos; | |
9f03783c CM |
2655 | /* |
2656 | * this will just nest into our transaction. It's important | |
2657 | * to use mark_inode_dirty so the inode gets pushed around on the | |
2658 | * dirty lists, and so that O_SYNC works as expected | |
2659 | */ | |
2660 | mark_inode_dirty(inode); | |
bd4c625c LT |
2661 | reiserfs_update_sd(&myth, inode); |
2662 | update_sd = 1; | |
2663 | ret = journal_end(&myth, inode->i_sb, 1); | |
2664 | reiserfs_write_unlock(inode->i_sb); | |
2665 | if (ret) | |
2666 | goto journal_error; | |
2667 | } | |
2668 | if (th) { | |
2669 | reiserfs_write_lock(inode->i_sb); | |
2670 | if (!update_sd) | |
9f03783c | 2671 | mark_inode_dirty(inode); |
bd4c625c LT |
2672 | ret = reiserfs_end_persistent_transaction(th); |
2673 | reiserfs_write_unlock(inode->i_sb); | |
2674 | if (ret) | |
2675 | goto out; | |
2676 | } | |
2677 | ||
bd4c625c LT |
2678 | out: |
2679 | return ret; | |
1da177e4 | 2680 | |
bd4c625c LT |
2681 | journal_error: |
2682 | if (th) { | |
2683 | reiserfs_write_lock(inode->i_sb); | |
2684 | if (!update_sd) | |
2685 | reiserfs_update_sd(th, inode); | |
2686 | ret = reiserfs_end_persistent_transaction(th); | |
2687 | reiserfs_write_unlock(inode->i_sb); | |
2688 | } | |
2689 | ||
2690 | return ret; | |
1da177e4 LT |
2691 | } |
2692 | ||
bd4c625c | 2693 | void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode) |
1da177e4 | 2694 | { |
bd4c625c LT |
2695 | if (reiserfs_attrs(inode->i_sb)) { |
2696 | if (sd_attrs & REISERFS_SYNC_FL) | |
2697 | inode->i_flags |= S_SYNC; | |
1da177e4 | 2698 | else |
bd4c625c LT |
2699 | inode->i_flags &= ~S_SYNC; |
2700 | if (sd_attrs & REISERFS_IMMUTABLE_FL) | |
2701 | inode->i_flags |= S_IMMUTABLE; | |
1da177e4 | 2702 | else |
bd4c625c LT |
2703 | inode->i_flags &= ~S_IMMUTABLE; |
2704 | if (sd_attrs & REISERFS_APPEND_FL) | |
2705 | inode->i_flags |= S_APPEND; | |
1da177e4 | 2706 | else |
bd4c625c LT |
2707 | inode->i_flags &= ~S_APPEND; |
2708 | if (sd_attrs & REISERFS_NOATIME_FL) | |
2709 | inode->i_flags |= S_NOATIME; | |
1da177e4 | 2710 | else |
bd4c625c LT |
2711 | inode->i_flags &= ~S_NOATIME; |
2712 | if (sd_attrs & REISERFS_NOTAIL_FL) | |
1da177e4 LT |
2713 | REISERFS_I(inode)->i_flags |= i_nopack_mask; |
2714 | else | |
2715 | REISERFS_I(inode)->i_flags &= ~i_nopack_mask; | |
2716 | } | |
2717 | } | |
2718 | ||
bd4c625c | 2719 | void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs) |
1da177e4 | 2720 | { |
bd4c625c LT |
2721 | if (reiserfs_attrs(inode->i_sb)) { |
2722 | if (inode->i_flags & S_IMMUTABLE) | |
1da177e4 LT |
2723 | *sd_attrs |= REISERFS_IMMUTABLE_FL; |
2724 | else | |
2725 | *sd_attrs &= ~REISERFS_IMMUTABLE_FL; | |
bd4c625c | 2726 | if (inode->i_flags & S_SYNC) |
1da177e4 LT |
2727 | *sd_attrs |= REISERFS_SYNC_FL; |
2728 | else | |
2729 | *sd_attrs &= ~REISERFS_SYNC_FL; | |
bd4c625c | 2730 | if (inode->i_flags & S_NOATIME) |
1da177e4 LT |
2731 | *sd_attrs |= REISERFS_NOATIME_FL; |
2732 | else | |
2733 | *sd_attrs &= ~REISERFS_NOATIME_FL; | |
bd4c625c | 2734 | if (REISERFS_I(inode)->i_flags & i_nopack_mask) |
1da177e4 LT |
2735 | *sd_attrs |= REISERFS_NOTAIL_FL; |
2736 | else | |
2737 | *sd_attrs &= ~REISERFS_NOTAIL_FL; | |
2738 | } | |
2739 | } | |
2740 | ||
2741 | /* decide if this buffer needs to stay around for data logging or ordered | |
2742 | ** write purposes | |
2743 | */ | |
2744 | static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh) | |
2745 | { | |
bd4c625c LT |
2746 | int ret = 1; |
2747 | struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb); | |
2748 | ||
d62b1b87 | 2749 | lock_buffer(bh); |
bd4c625c LT |
2750 | spin_lock(&j->j_dirty_buffers_lock); |
2751 | if (!buffer_mapped(bh)) { | |
2752 | goto free_jh; | |
2753 | } | |
2754 | /* the page is locked, and the only places that log a data buffer | |
2755 | * also lock the page. | |
1da177e4 | 2756 | */ |
bd4c625c LT |
2757 | if (reiserfs_file_data_log(inode)) { |
2758 | /* | |
2759 | * very conservative, leave the buffer pinned if | |
2760 | * anyone might need it. | |
2761 | */ | |
2762 | if (buffer_journaled(bh) || buffer_journal_dirty(bh)) { | |
2763 | ret = 0; | |
2764 | } | |
d62b1b87 | 2765 | } else if (buffer_dirty(bh)) { |
bd4c625c LT |
2766 | struct reiserfs_journal_list *jl; |
2767 | struct reiserfs_jh *jh = bh->b_private; | |
2768 | ||
2769 | /* why is this safe? | |
2770 | * reiserfs_setattr updates i_size in the on disk | |
2771 | * stat data before allowing vmtruncate to be called. | |
2772 | * | |
2773 | * If buffer was put onto the ordered list for this | |
2774 | * transaction, we know for sure either this transaction | |
2775 | * or an older one already has updated i_size on disk, | |
2776 | * and this ordered data won't be referenced in the file | |
2777 | * if we crash. | |
2778 | * | |
2779 | * if the buffer was put onto the ordered list for an older | |
2780 | * transaction, we need to leave it around | |
2781 | */ | |
2782 | if (jh && (jl = jh->jl) | |
2783 | && jl != SB_JOURNAL(inode->i_sb)->j_current_jl) | |
2784 | ret = 0; | |
2785 | } | |
2786 | free_jh: | |
2787 | if (ret && bh->b_private) { | |
2788 | reiserfs_free_jh(bh); | |
2789 | } | |
2790 | spin_unlock(&j->j_dirty_buffers_lock); | |
d62b1b87 | 2791 | unlock_buffer(bh); |
bd4c625c | 2792 | return ret; |
1da177e4 LT |
2793 | } |
2794 | ||
2795 | /* clm -- taken from fs/buffer.c:block_invalidate_page */ | |
2796 | static int reiserfs_invalidatepage(struct page *page, unsigned long offset) | |
2797 | { | |
bd4c625c LT |
2798 | struct buffer_head *head, *bh, *next; |
2799 | struct inode *inode = page->mapping->host; | |
2800 | unsigned int curr_off = 0; | |
2801 | int ret = 1; | |
1da177e4 | 2802 | |
bd4c625c | 2803 | BUG_ON(!PageLocked(page)); |
1da177e4 | 2804 | |
bd4c625c LT |
2805 | if (offset == 0) |
2806 | ClearPageChecked(page); | |
1da177e4 | 2807 | |
bd4c625c LT |
2808 | if (!page_has_buffers(page)) |
2809 | goto out; | |
2810 | ||
2811 | head = page_buffers(page); | |
2812 | bh = head; | |
2813 | do { | |
2814 | unsigned int next_off = curr_off + bh->b_size; | |
2815 | next = bh->b_this_page; | |
1da177e4 | 2816 | |
bd4c625c LT |
2817 | /* |
2818 | * is this block fully invalidated? | |
2819 | */ | |
2820 | if (offset <= curr_off) { | |
2821 | if (invalidatepage_can_drop(inode, bh)) | |
2822 | reiserfs_unmap_buffer(bh); | |
2823 | else | |
2824 | ret = 0; | |
2825 | } | |
2826 | curr_off = next_off; | |
2827 | bh = next; | |
2828 | } while (bh != head); | |
1da177e4 LT |
2829 | |
2830 | /* | |
bd4c625c LT |
2831 | * We release buffers only if the entire page is being invalidated. |
2832 | * The get_block cached value has been unconditionally invalidated, | |
2833 | * so real IO is not possible anymore. | |
1da177e4 | 2834 | */ |
bd4c625c LT |
2835 | if (!offset && ret) |
2836 | ret = try_to_release_page(page, 0); | |
2837 | out: | |
2838 | return ret; | |
1da177e4 LT |
2839 | } |
2840 | ||
bd4c625c LT |
2841 | static int reiserfs_set_page_dirty(struct page *page) |
2842 | { | |
2843 | struct inode *inode = page->mapping->host; | |
2844 | if (reiserfs_file_data_log(inode)) { | |
2845 | SetPageChecked(page); | |
2846 | return __set_page_dirty_nobuffers(page); | |
2847 | } | |
2848 | return __set_page_dirty_buffers(page); | |
1da177e4 LT |
2849 | } |
2850 | ||
2851 | /* | |
2852 | * Returns 1 if the page's buffers were dropped. The page is locked. | |
2853 | * | |
2854 | * Takes j_dirty_buffers_lock to protect the b_assoc_buffers list_heads | |
2855 | * in the buffers at page_buffers(page). | |
2856 | * | |
2857 | * even in -o notail mode, we can't be sure an old mount without -o notail | |
2858 | * didn't create files with tails. | |
2859 | */ | |
27496a8c | 2860 | static int reiserfs_releasepage(struct page *page, gfp_t unused_gfp_flags) |
1da177e4 | 2861 | { |
bd4c625c LT |
2862 | struct inode *inode = page->mapping->host; |
2863 | struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb); | |
2864 | struct buffer_head *head; | |
2865 | struct buffer_head *bh; | |
2866 | int ret = 1; | |
2867 | ||
2868 | WARN_ON(PageChecked(page)); | |
2869 | spin_lock(&j->j_dirty_buffers_lock); | |
2870 | head = page_buffers(page); | |
2871 | bh = head; | |
2872 | do { | |
2873 | if (bh->b_private) { | |
2874 | if (!buffer_dirty(bh) && !buffer_locked(bh)) { | |
2875 | reiserfs_free_jh(bh); | |
2876 | } else { | |
2877 | ret = 0; | |
2878 | break; | |
2879 | } | |
2880 | } | |
2881 | bh = bh->b_this_page; | |
2882 | } while (bh != head); | |
2883 | if (ret) | |
2884 | ret = try_to_free_buffers(page); | |
2885 | spin_unlock(&j->j_dirty_buffers_lock); | |
2886 | return ret; | |
1da177e4 LT |
2887 | } |
2888 | ||
2889 | /* We thank Mingming Cao for helping us understand in great detail what | |
2890 | to do in this section of the code. */ | |
2891 | static ssize_t reiserfs_direct_IO(int rw, struct kiocb *iocb, | |
bd4c625c LT |
2892 | const struct iovec *iov, loff_t offset, |
2893 | unsigned long nr_segs) | |
1da177e4 | 2894 | { |
bd4c625c LT |
2895 | struct file *file = iocb->ki_filp; |
2896 | struct inode *inode = file->f_mapping->host; | |
1da177e4 | 2897 | |
bd4c625c LT |
2898 | return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, |
2899 | offset, nr_segs, | |
2900 | reiserfs_get_blocks_direct_io, NULL); | |
1da177e4 LT |
2901 | } |
2902 | ||
bd4c625c LT |
2903 | int reiserfs_setattr(struct dentry *dentry, struct iattr *attr) |
2904 | { | |
2905 | struct inode *inode = dentry->d_inode; | |
2906 | int error; | |
2907 | unsigned int ia_valid = attr->ia_valid; | |
2908 | reiserfs_write_lock(inode->i_sb); | |
2909 | if (attr->ia_valid & ATTR_SIZE) { | |
2910 | /* version 2 items will be caught by the s_maxbytes check | |
2911 | ** done for us in vmtruncate | |
2912 | */ | |
2913 | if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 && | |
2914 | attr->ia_size > MAX_NON_LFS) { | |
2915 | error = -EFBIG; | |
2916 | goto out; | |
2917 | } | |
2918 | /* fill in hole pointers in the expanding truncate case. */ | |
2919 | if (attr->ia_size > inode->i_size) { | |
2920 | error = generic_cont_expand(inode, attr->ia_size); | |
2921 | if (REISERFS_I(inode)->i_prealloc_count > 0) { | |
2922 | int err; | |
2923 | struct reiserfs_transaction_handle th; | |
2924 | /* we're changing at most 2 bitmaps, inode + super */ | |
2925 | err = journal_begin(&th, inode->i_sb, 4); | |
2926 | if (!err) { | |
2927 | reiserfs_discard_prealloc(&th, inode); | |
2928 | err = journal_end(&th, inode->i_sb, 4); | |
2929 | } | |
2930 | if (err) | |
2931 | error = err; | |
2932 | } | |
2933 | if (error) | |
2934 | goto out; | |
1da177e4 | 2935 | } |
1da177e4 | 2936 | } |
1da177e4 | 2937 | |
bd4c625c LT |
2938 | if ((((attr->ia_valid & ATTR_UID) && (attr->ia_uid & ~0xffff)) || |
2939 | ((attr->ia_valid & ATTR_GID) && (attr->ia_gid & ~0xffff))) && | |
2940 | (get_inode_sd_version(inode) == STAT_DATA_V1)) { | |
1da177e4 | 2941 | /* stat data of format v3.5 has 16 bit uid and gid */ |
bd4c625c LT |
2942 | error = -EINVAL; |
2943 | goto out; | |
2944 | } | |
1da177e4 | 2945 | |
bd4c625c LT |
2946 | error = inode_change_ok(inode, attr); |
2947 | if (!error) { | |
2948 | if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) || | |
2949 | (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) { | |
2950 | error = reiserfs_chown_xattrs(inode, attr); | |
2951 | ||
2952 | if (!error) { | |
2953 | struct reiserfs_transaction_handle th; | |
2954 | int jbegin_count = | |
2955 | 2 * | |
2956 | (REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb) + | |
2957 | REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb)) + | |
2958 | 2; | |
2959 | ||
2960 | /* (user+group)*(old+new) structure - we count quota info and , inode write (sb, inode) */ | |
2961 | error = | |
2962 | journal_begin(&th, inode->i_sb, | |
2963 | jbegin_count); | |
2964 | if (error) | |
2965 | goto out; | |
2966 | error = | |
2967 | DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0; | |
2968 | if (error) { | |
2969 | journal_end(&th, inode->i_sb, | |
2970 | jbegin_count); | |
2971 | goto out; | |
2972 | } | |
2973 | /* Update corresponding info in inode so that everything is in | |
2974 | * one transaction */ | |
2975 | if (attr->ia_valid & ATTR_UID) | |
2976 | inode->i_uid = attr->ia_uid; | |
2977 | if (attr->ia_valid & ATTR_GID) | |
2978 | inode->i_gid = attr->ia_gid; | |
2979 | mark_inode_dirty(inode); | |
2980 | error = | |
2981 | journal_end(&th, inode->i_sb, jbegin_count); | |
2982 | } | |
2983 | } | |
2984 | if (!error) | |
2985 | error = inode_setattr(inode, attr); | |
2986 | } | |
1da177e4 | 2987 | |
bd4c625c LT |
2988 | if (!error && reiserfs_posixacl(inode->i_sb)) { |
2989 | if (attr->ia_valid & ATTR_MODE) | |
2990 | error = reiserfs_acl_chmod(inode); | |
2991 | } | |
1da177e4 | 2992 | |
bd4c625c LT |
2993 | out: |
2994 | reiserfs_write_unlock(inode->i_sb); | |
2995 | return error; | |
1da177e4 LT |
2996 | } |
2997 | ||
1da177e4 | 2998 | struct address_space_operations reiserfs_address_space_operations = { |
bd4c625c LT |
2999 | .writepage = reiserfs_writepage, |
3000 | .readpage = reiserfs_readpage, | |
3001 | .readpages = reiserfs_readpages, | |
3002 | .releasepage = reiserfs_releasepage, | |
3003 | .invalidatepage = reiserfs_invalidatepage, | |
3004 | .sync_page = block_sync_page, | |
3005 | .prepare_write = reiserfs_prepare_write, | |
3006 | .commit_write = reiserfs_commit_write, | |
3007 | .bmap = reiserfs_aop_bmap, | |
3008 | .direct_IO = reiserfs_direct_IO, | |
3009 | .set_page_dirty = reiserfs_set_page_dirty, | |
3010 | }; |