]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/ext3/inode.c | |
3 | * | |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * from | |
10 | * | |
11 | * linux/fs/minix/inode.c | |
12 | * | |
13 | * Copyright (C) 1991, 1992 Linus Torvalds | |
14 | * | |
15 | * Goal-directed block allocation by Stephen Tweedie | |
e9ad5620 | 16 | * (sct@redhat.com), 1993, 1998 |
1da177e4 LT |
17 | * Big-endian to little-endian byte-swapping/bitmaps by |
18 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
19 | * 64-bit file support on 64-bit platforms by Jakub Jelinek | |
e9ad5620 | 20 | * (jj@sunsite.ms.mff.cuni.cz) |
1da177e4 LT |
21 | * |
22 | * Assorted race fixes, rewrite of ext3_get_block() by Al Viro, 2000 | |
23 | */ | |
24 | ||
25 | #include <linux/module.h> | |
26 | #include <linux/fs.h> | |
27 | #include <linux/time.h> | |
28 | #include <linux/ext3_jbd.h> | |
29 | #include <linux/jbd.h> | |
1da177e4 LT |
30 | #include <linux/highuid.h> |
31 | #include <linux/pagemap.h> | |
32 | #include <linux/quotaops.h> | |
33 | #include <linux/string.h> | |
34 | #include <linux/buffer_head.h> | |
35 | #include <linux/writeback.h> | |
36 | #include <linux/mpage.h> | |
37 | #include <linux/uio.h> | |
caa38fb0 | 38 | #include <linux/bio.h> |
68c9d702 | 39 | #include <linux/fiemap.h> |
b5ed3112 | 40 | #include <linux/namei.h> |
1da177e4 LT |
41 | #include "xattr.h" |
42 | #include "acl.h" | |
43 | ||
44 | static int ext3_writepage_trans_blocks(struct inode *inode); | |
45 | ||
46 | /* | |
47 | * Test whether an inode is a fast symlink. | |
48 | */ | |
d6859bfc | 49 | static int ext3_inode_is_fast_symlink(struct inode *inode) |
1da177e4 LT |
50 | { |
51 | int ea_blocks = EXT3_I(inode)->i_file_acl ? | |
52 | (inode->i_sb->s_blocksize >> 9) : 0; | |
53 | ||
d6859bfc | 54 | return (S_ISLNK(inode->i_mode) && inode->i_blocks - ea_blocks == 0); |
1da177e4 LT |
55 | } |
56 | ||
d6859bfc AM |
57 | /* |
58 | * The ext3 forget function must perform a revoke if we are freeing data | |
1da177e4 | 59 | * which has been journaled. Metadata (eg. indirect blocks) must be |
ae6ddcc5 | 60 | * revoked in all cases. |
1da177e4 LT |
61 | * |
62 | * "bh" may be NULL: a metadata block may have been freed from memory | |
63 | * but there may still be a record of it in the journal, and that record | |
64 | * still needs to be revoked. | |
65 | */ | |
d6859bfc | 66 | int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode, |
1c2bf374 | 67 | struct buffer_head *bh, ext3_fsblk_t blocknr) |
1da177e4 LT |
68 | { |
69 | int err; | |
70 | ||
71 | might_sleep(); | |
72 | ||
73 | BUFFER_TRACE(bh, "enter"); | |
74 | ||
75 | jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, " | |
76 | "data mode %lx\n", | |
77 | bh, is_metadata, inode->i_mode, | |
78 | test_opt(inode->i_sb, DATA_FLAGS)); | |
79 | ||
80 | /* Never use the revoke function if we are doing full data | |
81 | * journaling: there is no need to, and a V1 superblock won't | |
82 | * support it. Otherwise, only skip the revoke on un-journaled | |
83 | * data blocks. */ | |
84 | ||
85 | if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA || | |
86 | (!is_metadata && !ext3_should_journal_data(inode))) { | |
87 | if (bh) { | |
88 | BUFFER_TRACE(bh, "call journal_forget"); | |
89 | return ext3_journal_forget(handle, bh); | |
90 | } | |
91 | return 0; | |
92 | } | |
93 | ||
94 | /* | |
95 | * data!=journal && (is_metadata || should_journal_data(inode)) | |
96 | */ | |
97 | BUFFER_TRACE(bh, "call ext3_journal_revoke"); | |
98 | err = ext3_journal_revoke(handle, blocknr, bh); | |
99 | if (err) | |
e05b6b52 | 100 | ext3_abort(inode->i_sb, __func__, |
1da177e4 LT |
101 | "error %d when attempting revoke", err); |
102 | BUFFER_TRACE(bh, "exit"); | |
103 | return err; | |
104 | } | |
105 | ||
106 | /* | |
d6859bfc | 107 | * Work out how many blocks we need to proceed with the next chunk of a |
1da177e4 LT |
108 | * truncate transaction. |
109 | */ | |
ae6ddcc5 | 110 | static unsigned long blocks_for_truncate(struct inode *inode) |
1da177e4 LT |
111 | { |
112 | unsigned long needed; | |
113 | ||
114 | needed = inode->i_blocks >> (inode->i_sb->s_blocksize_bits - 9); | |
115 | ||
116 | /* Give ourselves just enough room to cope with inodes in which | |
117 | * i_blocks is corrupt: we've seen disk corruptions in the past | |
118 | * which resulted in random data in an inode which looked enough | |
119 | * like a regular file for ext3 to try to delete it. Things | |
120 | * will go a bit crazy if that happens, but at least we should | |
121 | * try not to panic the whole kernel. */ | |
122 | if (needed < 2) | |
123 | needed = 2; | |
124 | ||
125 | /* But we need to bound the transaction so we don't overflow the | |
126 | * journal. */ | |
ae6ddcc5 | 127 | if (needed > EXT3_MAX_TRANS_DATA) |
1da177e4 LT |
128 | needed = EXT3_MAX_TRANS_DATA; |
129 | ||
1f54587b | 130 | return EXT3_DATA_TRANS_BLOCKS(inode->i_sb) + needed; |
1da177e4 LT |
131 | } |
132 | ||
ae6ddcc5 | 133 | /* |
1da177e4 LT |
134 | * Truncate transactions can be complex and absolutely huge. So we need to |
135 | * be able to restart the transaction at a conventient checkpoint to make | |
136 | * sure we don't overflow the journal. | |
137 | * | |
138 | * start_transaction gets us a new handle for a truncate transaction, | |
139 | * and extend_transaction tries to extend the existing one a bit. If | |
140 | * extend fails, we need to propagate the failure up and restart the | |
ae6ddcc5 | 141 | * transaction in the top-level truncate loop. --sct |
1da177e4 | 142 | */ |
ae6ddcc5 | 143 | static handle_t *start_transaction(struct inode *inode) |
1da177e4 LT |
144 | { |
145 | handle_t *result; | |
146 | ||
147 | result = ext3_journal_start(inode, blocks_for_truncate(inode)); | |
148 | if (!IS_ERR(result)) | |
149 | return result; | |
150 | ||
151 | ext3_std_error(inode->i_sb, PTR_ERR(result)); | |
152 | return result; | |
153 | } | |
154 | ||
155 | /* | |
156 | * Try to extend this transaction for the purposes of truncation. | |
157 | * | |
158 | * Returns 0 if we managed to create more room. If we can't create more | |
159 | * room, and the transaction must be restarted we return 1. | |
160 | */ | |
161 | static int try_to_extend_transaction(handle_t *handle, struct inode *inode) | |
162 | { | |
163 | if (handle->h_buffer_credits > EXT3_RESERVE_TRANS_BLOCKS) | |
164 | return 0; | |
165 | if (!ext3_journal_extend(handle, blocks_for_truncate(inode))) | |
166 | return 0; | |
167 | return 1; | |
168 | } | |
169 | ||
170 | /* | |
171 | * Restart the transaction associated with *handle. This does a commit, | |
172 | * so before we call here everything must be consistently dirtied against | |
173 | * this transaction. | |
174 | */ | |
00171d3c | 175 | static int truncate_restart_transaction(handle_t *handle, struct inode *inode) |
1da177e4 | 176 | { |
00171d3c JK |
177 | int ret; |
178 | ||
1da177e4 | 179 | jbd_debug(2, "restarting handle %p\n", handle); |
00171d3c JK |
180 | /* |
181 | * Drop truncate_mutex to avoid deadlock with ext3_get_blocks_handle | |
182 | * At this moment, get_block can be called only for blocks inside | |
183 | * i_size since page cache has been already dropped and writes are | |
184 | * blocked by i_mutex. So we can safely drop the truncate_mutex. | |
185 | */ | |
186 | mutex_unlock(&EXT3_I(inode)->truncate_mutex); | |
187 | ret = ext3_journal_restart(handle, blocks_for_truncate(inode)); | |
188 | mutex_lock(&EXT3_I(inode)->truncate_mutex); | |
189 | return ret; | |
1da177e4 LT |
190 | } |
191 | ||
192 | /* | |
ac14a95b | 193 | * Called at inode eviction from icache |
1da177e4 | 194 | */ |
ac14a95b | 195 | void ext3_evict_inode (struct inode *inode) |
1da177e4 | 196 | { |
ac14a95b | 197 | struct ext3_block_alloc_info *rsv; |
1da177e4 | 198 | handle_t *handle; |
ac14a95b | 199 | int want_delete = 0; |
1da177e4 | 200 | |
ac14a95b | 201 | if (!inode->i_nlink && !is_bad_inode(inode)) { |
871a2931 | 202 | dquot_initialize(inode); |
ac14a95b AV |
203 | want_delete = 1; |
204 | } | |
907f4554 | 205 | |
fef26658 MF |
206 | truncate_inode_pages(&inode->i_data, 0); |
207 | ||
ac14a95b AV |
208 | ext3_discard_reservation(inode); |
209 | rsv = EXT3_I(inode)->i_block_alloc_info; | |
210 | EXT3_I(inode)->i_block_alloc_info = NULL; | |
211 | if (unlikely(rsv)) | |
212 | kfree(rsv); | |
213 | ||
214 | if (!want_delete) | |
1da177e4 LT |
215 | goto no_delete; |
216 | ||
217 | handle = start_transaction(inode); | |
218 | if (IS_ERR(handle)) { | |
d6859bfc AM |
219 | /* |
220 | * If we're going to skip the normal cleanup, we still need to | |
221 | * make sure that the in-core orphan linked list is properly | |
222 | * cleaned up. | |
223 | */ | |
1da177e4 LT |
224 | ext3_orphan_del(NULL, inode); |
225 | goto no_delete; | |
226 | } | |
227 | ||
228 | if (IS_SYNC(inode)) | |
229 | handle->h_sync = 1; | |
230 | inode->i_size = 0; | |
231 | if (inode->i_blocks) | |
232 | ext3_truncate(inode); | |
233 | /* | |
234 | * Kill off the orphan record which ext3_truncate created. | |
235 | * AKPM: I think this can be inside the above `if'. | |
236 | * Note that ext3_orphan_del() has to be able to cope with the | |
237 | * deletion of a non-existent orphan - this is because we don't | |
238 | * know if ext3_truncate() actually created an orphan record. | |
239 | * (Well, we could do this if we need to, but heck - it works) | |
240 | */ | |
241 | ext3_orphan_del(handle, inode); | |
242 | EXT3_I(inode)->i_dtime = get_seconds(); | |
243 | ||
ae6ddcc5 | 244 | /* |
1da177e4 LT |
245 | * One subtle ordering requirement: if anything has gone wrong |
246 | * (transaction abort, IO errors, whatever), then we can still | |
247 | * do these next steps (the fs will already have been marked as | |
248 | * having errors), but we can't free the inode if the mark_dirty | |
ae6ddcc5 | 249 | * fails. |
1da177e4 | 250 | */ |
ac14a95b AV |
251 | if (ext3_mark_inode_dirty(handle, inode)) { |
252 | /* If that failed, just dquot_drop() and be done with that */ | |
253 | dquot_drop(inode); | |
254 | end_writeback(inode); | |
255 | } else { | |
256 | ext3_xattr_delete_inode(handle, inode); | |
257 | dquot_free_inode(inode); | |
258 | dquot_drop(inode); | |
259 | end_writeback(inode); | |
1da177e4 | 260 | ext3_free_inode(handle, inode); |
ac14a95b | 261 | } |
1da177e4 LT |
262 | ext3_journal_stop(handle); |
263 | return; | |
264 | no_delete: | |
ac14a95b AV |
265 | end_writeback(inode); |
266 | dquot_drop(inode); | |
1da177e4 LT |
267 | } |
268 | ||
1da177e4 LT |
269 | typedef struct { |
270 | __le32 *p; | |
271 | __le32 key; | |
272 | struct buffer_head *bh; | |
273 | } Indirect; | |
274 | ||
275 | static inline void add_chain(Indirect *p, struct buffer_head *bh, __le32 *v) | |
276 | { | |
277 | p->key = *(p->p = v); | |
278 | p->bh = bh; | |
279 | } | |
280 | ||
d6859bfc | 281 | static int verify_chain(Indirect *from, Indirect *to) |
1da177e4 LT |
282 | { |
283 | while (from <= to && from->key == *from->p) | |
284 | from++; | |
285 | return (from > to); | |
286 | } | |
287 | ||
288 | /** | |
289 | * ext3_block_to_path - parse the block number into array of offsets | |
290 | * @inode: inode in question (we are only interested in its superblock) | |
291 | * @i_block: block number to be parsed | |
292 | * @offsets: array to store the offsets in | |
293 | * @boundary: set this non-zero if the referred-to block is likely to be | |
294 | * followed (on disk) by an indirect block. | |
295 | * | |
296 | * To store the locations of file's data ext3 uses a data structure common | |
297 | * for UNIX filesystems - tree of pointers anchored in the inode, with | |
298 | * data blocks at leaves and indirect blocks in intermediate nodes. | |
299 | * This function translates the block number into path in that tree - | |
300 | * return value is the path length and @offsets[n] is the offset of | |
301 | * pointer to (n+1)th node in the nth one. If @block is out of range | |
302 | * (negative or too large) warning is printed and zero returned. | |
303 | * | |
304 | * Note: function doesn't find node addresses, so no IO is needed. All | |
305 | * we need to know is the capacity of indirect blocks (taken from the | |
306 | * inode->i_sb). | |
307 | */ | |
308 | ||
309 | /* | |
310 | * Portability note: the last comparison (check that we fit into triple | |
311 | * indirect block) is spelled differently, because otherwise on an | |
312 | * architecture with 32-bit longs and 8Kb pages we might get into trouble | |
313 | * if our filesystem had 8Kb blocks. We might use long long, but that would | |
314 | * kill us on x86. Oh, well, at least the sign propagation does not matter - | |
315 | * i_block would have to be negative in the very beginning, so we would not | |
316 | * get there at all. | |
317 | */ | |
318 | ||
319 | static int ext3_block_to_path(struct inode *inode, | |
320 | long i_block, int offsets[4], int *boundary) | |
321 | { | |
322 | int ptrs = EXT3_ADDR_PER_BLOCK(inode->i_sb); | |
323 | int ptrs_bits = EXT3_ADDR_PER_BLOCK_BITS(inode->i_sb); | |
324 | const long direct_blocks = EXT3_NDIR_BLOCKS, | |
325 | indirect_blocks = ptrs, | |
326 | double_blocks = (1 << (ptrs_bits * 2)); | |
327 | int n = 0; | |
328 | int final = 0; | |
329 | ||
330 | if (i_block < 0) { | |
331 | ext3_warning (inode->i_sb, "ext3_block_to_path", "block < 0"); | |
332 | } else if (i_block < direct_blocks) { | |
333 | offsets[n++] = i_block; | |
334 | final = direct_blocks; | |
335 | } else if ( (i_block -= direct_blocks) < indirect_blocks) { | |
336 | offsets[n++] = EXT3_IND_BLOCK; | |
337 | offsets[n++] = i_block; | |
338 | final = ptrs; | |
339 | } else if ((i_block -= indirect_blocks) < double_blocks) { | |
340 | offsets[n++] = EXT3_DIND_BLOCK; | |
341 | offsets[n++] = i_block >> ptrs_bits; | |
342 | offsets[n++] = i_block & (ptrs - 1); | |
343 | final = ptrs; | |
344 | } else if (((i_block -= double_blocks) >> (ptrs_bits * 2)) < ptrs) { | |
345 | offsets[n++] = EXT3_TIND_BLOCK; | |
346 | offsets[n++] = i_block >> (ptrs_bits * 2); | |
347 | offsets[n++] = (i_block >> ptrs_bits) & (ptrs - 1); | |
348 | offsets[n++] = i_block & (ptrs - 1); | |
349 | final = ptrs; | |
350 | } else { | |
d6859bfc | 351 | ext3_warning(inode->i_sb, "ext3_block_to_path", "block > big"); |
1da177e4 LT |
352 | } |
353 | if (boundary) | |
89747d36 | 354 | *boundary = final - 1 - (i_block & (ptrs - 1)); |
1da177e4 LT |
355 | return n; |
356 | } | |
357 | ||
358 | /** | |
359 | * ext3_get_branch - read the chain of indirect blocks leading to data | |
360 | * @inode: inode in question | |
361 | * @depth: depth of the chain (1 - direct pointer, etc.) | |
362 | * @offsets: offsets of pointers in inode/indirect blocks | |
363 | * @chain: place to store the result | |
364 | * @err: here we store the error value | |
365 | * | |
366 | * Function fills the array of triples <key, p, bh> and returns %NULL | |
367 | * if everything went OK or the pointer to the last filled triple | |
368 | * (incomplete one) otherwise. Upon the return chain[i].key contains | |
369 | * the number of (i+1)-th block in the chain (as it is stored in memory, | |
370 | * i.e. little-endian 32-bit), chain[i].p contains the address of that | |
371 | * number (it points into struct inode for i==0 and into the bh->b_data | |
372 | * for i>0) and chain[i].bh points to the buffer_head of i-th indirect | |
373 | * block for i>0 and NULL for i==0. In other words, it holds the block | |
374 | * numbers of the chain, addresses they were taken from (and where we can | |
375 | * verify that chain did not change) and buffer_heads hosting these | |
376 | * numbers. | |
377 | * | |
378 | * Function stops when it stumbles upon zero pointer (absent block) | |
379 | * (pointer to last triple returned, *@err == 0) | |
380 | * or when it gets an IO error reading an indirect block | |
381 | * (ditto, *@err == -EIO) | |
382 | * or when it notices that chain had been changed while it was reading | |
383 | * (ditto, *@err == -EAGAIN) | |
384 | * or when it reads all @depth-1 indirect blocks successfully and finds | |
385 | * the whole chain, all way to the data (returns %NULL, *err == 0). | |
386 | */ | |
387 | static Indirect *ext3_get_branch(struct inode *inode, int depth, int *offsets, | |
388 | Indirect chain[4], int *err) | |
389 | { | |
390 | struct super_block *sb = inode->i_sb; | |
391 | Indirect *p = chain; | |
392 | struct buffer_head *bh; | |
393 | ||
394 | *err = 0; | |
395 | /* i_data is not going away, no lock needed */ | |
396 | add_chain (chain, NULL, EXT3_I(inode)->i_data + *offsets); | |
397 | if (!p->key) | |
398 | goto no_block; | |
399 | while (--depth) { | |
400 | bh = sb_bread(sb, le32_to_cpu(p->key)); | |
401 | if (!bh) | |
402 | goto failure; | |
403 | /* Reader: pointers */ | |
404 | if (!verify_chain(chain, p)) | |
405 | goto changed; | |
406 | add_chain(++p, bh, (__le32*)bh->b_data + *++offsets); | |
407 | /* Reader: end */ | |
408 | if (!p->key) | |
409 | goto no_block; | |
410 | } | |
411 | return NULL; | |
412 | ||
413 | changed: | |
414 | brelse(bh); | |
415 | *err = -EAGAIN; | |
416 | goto no_block; | |
417 | failure: | |
418 | *err = -EIO; | |
419 | no_block: | |
420 | return p; | |
421 | } | |
422 | ||
423 | /** | |
424 | * ext3_find_near - find a place for allocation with sufficient locality | |
425 | * @inode: owner | |
426 | * @ind: descriptor of indirect block. | |
427 | * | |
1cc8dcf5 | 428 | * This function returns the preferred place for block allocation. |
1da177e4 LT |
429 | * It is used when heuristic for sequential allocation fails. |
430 | * Rules are: | |
431 | * + if there is a block to the left of our position - allocate near it. | |
432 | * + if pointer will live in indirect block - allocate near that block. | |
433 | * + if pointer will live in inode - allocate in the same | |
ae6ddcc5 | 434 | * cylinder group. |
1da177e4 LT |
435 | * |
436 | * In the latter case we colour the starting block by the callers PID to | |
437 | * prevent it from clashing with concurrent allocations for a different inode | |
438 | * in the same block group. The PID is used here so that functionally related | |
439 | * files will be close-by on-disk. | |
440 | * | |
441 | * Caller must make sure that @ind is valid and will stay that way. | |
442 | */ | |
43d23f90 | 443 | static ext3_fsblk_t ext3_find_near(struct inode *inode, Indirect *ind) |
1da177e4 LT |
444 | { |
445 | struct ext3_inode_info *ei = EXT3_I(inode); | |
446 | __le32 *start = ind->bh ? (__le32*) ind->bh->b_data : ei->i_data; | |
447 | __le32 *p; | |
43d23f90 MC |
448 | ext3_fsblk_t bg_start; |
449 | ext3_grpblk_t colour; | |
1da177e4 LT |
450 | |
451 | /* Try to find previous block */ | |
d6859bfc | 452 | for (p = ind->p - 1; p >= start; p--) { |
1da177e4 LT |
453 | if (*p) |
454 | return le32_to_cpu(*p); | |
d6859bfc | 455 | } |
1da177e4 LT |
456 | |
457 | /* No such thing, so let's try location of indirect block */ | |
458 | if (ind->bh) | |
459 | return ind->bh->b_blocknr; | |
460 | ||
461 | /* | |
d6859bfc AM |
462 | * It is going to be referred to from the inode itself? OK, just put it |
463 | * into the same cylinder group then. | |
1da177e4 | 464 | */ |
43d23f90 | 465 | bg_start = ext3_group_first_block_no(inode->i_sb, ei->i_block_group); |
1da177e4 LT |
466 | colour = (current->pid % 16) * |
467 | (EXT3_BLOCKS_PER_GROUP(inode->i_sb) / 16); | |
468 | return bg_start + colour; | |
469 | } | |
470 | ||
471 | /** | |
1cc8dcf5 | 472 | * ext3_find_goal - find a preferred place for allocation. |
1da177e4 LT |
473 | * @inode: owner |
474 | * @block: block we want | |
1da177e4 | 475 | * @partial: pointer to the last triple within a chain |
1da177e4 | 476 | * |
1cc8dcf5 | 477 | * Normally this function find the preferred place for block allocation, |
fb01bfda | 478 | * returns it. |
1da177e4 LT |
479 | */ |
480 | ||
43d23f90 | 481 | static ext3_fsblk_t ext3_find_goal(struct inode *inode, long block, |
fb01bfda | 482 | Indirect *partial) |
1da177e4 | 483 | { |
d6859bfc AM |
484 | struct ext3_block_alloc_info *block_i; |
485 | ||
486 | block_i = EXT3_I(inode)->i_block_alloc_info; | |
1da177e4 LT |
487 | |
488 | /* | |
489 | * try the heuristic for sequential allocation, | |
490 | * failing that at least try to get decent locality. | |
491 | */ | |
492 | if (block_i && (block == block_i->last_alloc_logical_block + 1) | |
493 | && (block_i->last_alloc_physical_block != 0)) { | |
fe55c452 | 494 | return block_i->last_alloc_physical_block + 1; |
1da177e4 LT |
495 | } |
496 | ||
fe55c452 | 497 | return ext3_find_near(inode, partial); |
1da177e4 | 498 | } |
d6859bfc | 499 | |
b47b2478 | 500 | /** |
a4c18ad2 | 501 | * ext3_blks_to_allocate - Look up the block map and count the number |
b47b2478 MC |
502 | * of direct blocks need to be allocated for the given branch. |
503 | * | |
e9ad5620 | 504 | * @branch: chain of indirect blocks |
b47b2478 MC |
505 | * @k: number of blocks need for indirect blocks |
506 | * @blks: number of data blocks to be mapped. | |
507 | * @blocks_to_boundary: the offset in the indirect block | |
508 | * | |
509 | * return the total number of blocks to be allocate, including the | |
510 | * direct and indirect blocks. | |
511 | */ | |
d6859bfc | 512 | static int ext3_blks_to_allocate(Indirect *branch, int k, unsigned long blks, |
b47b2478 MC |
513 | int blocks_to_boundary) |
514 | { | |
515 | unsigned long count = 0; | |
516 | ||
517 | /* | |
518 | * Simple case, [t,d]Indirect block(s) has not allocated yet | |
519 | * then it's clear blocks on that path have not allocated | |
520 | */ | |
521 | if (k > 0) { | |
d6859bfc | 522 | /* right now we don't handle cross boundary allocation */ |
b47b2478 MC |
523 | if (blks < blocks_to_boundary + 1) |
524 | count += blks; | |
525 | else | |
526 | count += blocks_to_boundary + 1; | |
527 | return count; | |
528 | } | |
529 | ||
530 | count++; | |
531 | while (count < blks && count <= blocks_to_boundary && | |
532 | le32_to_cpu(*(branch[0].p + count)) == 0) { | |
533 | count++; | |
534 | } | |
535 | return count; | |
536 | } | |
537 | ||
538 | /** | |
a4c18ad2 NK |
539 | * ext3_alloc_blocks - multiple allocate blocks needed for a branch |
540 | * @handle: handle for this transaction | |
541 | * @inode: owner | |
542 | * @goal: preferred place for allocation | |
b47b2478 MC |
543 | * @indirect_blks: the number of blocks need to allocate for indirect |
544 | * blocks | |
a4c18ad2 | 545 | * @blks: number of blocks need to allocated for direct blocks |
b47b2478 MC |
546 | * @new_blocks: on return it will store the new block numbers for |
547 | * the indirect blocks(if needed) and the first direct block, | |
a4c18ad2 NK |
548 | * @err: here we store the error value |
549 | * | |
550 | * return the number of direct blocks allocated | |
b47b2478 MC |
551 | */ |
552 | static int ext3_alloc_blocks(handle_t *handle, struct inode *inode, | |
43d23f90 MC |
553 | ext3_fsblk_t goal, int indirect_blks, int blks, |
554 | ext3_fsblk_t new_blocks[4], int *err) | |
b47b2478 MC |
555 | { |
556 | int target, i; | |
557 | unsigned long count = 0; | |
558 | int index = 0; | |
43d23f90 | 559 | ext3_fsblk_t current_block = 0; |
b47b2478 MC |
560 | int ret = 0; |
561 | ||
562 | /* | |
563 | * Here we try to allocate the requested multiple blocks at once, | |
564 | * on a best-effort basis. | |
565 | * To build a branch, we should allocate blocks for | |
566 | * the indirect blocks(if not allocated yet), and at least | |
567 | * the first direct block of this branch. That's the | |
568 | * minimum number of blocks need to allocate(required) | |
569 | */ | |
570 | target = blks + indirect_blks; | |
571 | ||
572 | while (1) { | |
573 | count = target; | |
574 | /* allocating blocks for indirect blocks and direct blocks */ | |
d6859bfc | 575 | current_block = ext3_new_blocks(handle,inode,goal,&count,err); |
b47b2478 MC |
576 | if (*err) |
577 | goto failed_out; | |
578 | ||
579 | target -= count; | |
580 | /* allocate blocks for indirect blocks */ | |
581 | while (index < indirect_blks && count) { | |
582 | new_blocks[index++] = current_block++; | |
583 | count--; | |
584 | } | |
585 | ||
586 | if (count > 0) | |
587 | break; | |
588 | } | |
589 | ||
590 | /* save the new block number for the first direct block */ | |
591 | new_blocks[index] = current_block; | |
592 | ||
593 | /* total number of blocks allocated for direct blocks */ | |
594 | ret = count; | |
595 | *err = 0; | |
596 | return ret; | |
597 | failed_out: | |
598 | for (i = 0; i <index; i++) | |
599 | ext3_free_blocks(handle, inode, new_blocks[i], 1); | |
600 | return ret; | |
601 | } | |
1da177e4 LT |
602 | |
603 | /** | |
604 | * ext3_alloc_branch - allocate and set up a chain of blocks. | |
a4c18ad2 | 605 | * @handle: handle for this transaction |
1da177e4 | 606 | * @inode: owner |
b47b2478 MC |
607 | * @indirect_blks: number of allocated indirect blocks |
608 | * @blks: number of allocated direct blocks | |
a4c18ad2 | 609 | * @goal: preferred place for allocation |
1da177e4 LT |
610 | * @offsets: offsets (in the blocks) to store the pointers to next. |
611 | * @branch: place to store the chain in. | |
612 | * | |
b47b2478 | 613 | * This function allocates blocks, zeroes out all but the last one, |
1da177e4 LT |
614 | * links them into chain and (if we are synchronous) writes them to disk. |
615 | * In other words, it prepares a branch that can be spliced onto the | |
616 | * inode. It stores the information about that chain in the branch[], in | |
617 | * the same format as ext3_get_branch() would do. We are calling it after | |
618 | * we had read the existing part of chain and partial points to the last | |
619 | * triple of that (one with zero ->key). Upon the exit we have the same | |
5b116879 | 620 | * picture as after the successful ext3_get_block(), except that in one |
1da177e4 LT |
621 | * place chain is disconnected - *branch->p is still zero (we did not |
622 | * set the last link), but branch->key contains the number that should | |
623 | * be placed into *branch->p to fill that gap. | |
624 | * | |
625 | * If allocation fails we free all blocks we've allocated (and forget | |
626 | * their buffer_heads) and return the error value the from failed | |
627 | * ext3_alloc_block() (normally -ENOSPC). Otherwise we set the chain | |
628 | * as described above and return 0. | |
629 | */ | |
1da177e4 | 630 | static int ext3_alloc_branch(handle_t *handle, struct inode *inode, |
43d23f90 | 631 | int indirect_blks, int *blks, ext3_fsblk_t goal, |
b47b2478 | 632 | int *offsets, Indirect *branch) |
1da177e4 LT |
633 | { |
634 | int blocksize = inode->i_sb->s_blocksize; | |
b47b2478 | 635 | int i, n = 0; |
1da177e4 | 636 | int err = 0; |
b47b2478 MC |
637 | struct buffer_head *bh; |
638 | int num; | |
43d23f90 MC |
639 | ext3_fsblk_t new_blocks[4]; |
640 | ext3_fsblk_t current_block; | |
1da177e4 | 641 | |
b47b2478 MC |
642 | num = ext3_alloc_blocks(handle, inode, goal, indirect_blks, |
643 | *blks, new_blocks, &err); | |
644 | if (err) | |
645 | return err; | |
1da177e4 | 646 | |
b47b2478 MC |
647 | branch[0].key = cpu_to_le32(new_blocks[0]); |
648 | /* | |
649 | * metadata blocks and data blocks are allocated. | |
650 | */ | |
651 | for (n = 1; n <= indirect_blks; n++) { | |
652 | /* | |
653 | * Get buffer_head for parent block, zero it out | |
654 | * and set the pointer to new one, then send | |
655 | * parent to disk. | |
656 | */ | |
657 | bh = sb_getblk(inode->i_sb, new_blocks[n-1]); | |
658 | branch[n].bh = bh; | |
659 | lock_buffer(bh); | |
660 | BUFFER_TRACE(bh, "call get_create_access"); | |
661 | err = ext3_journal_get_create_access(handle, bh); | |
662 | if (err) { | |
1da177e4 | 663 | unlock_buffer(bh); |
b47b2478 MC |
664 | brelse(bh); |
665 | goto failed; | |
666 | } | |
1da177e4 | 667 | |
b47b2478 MC |
668 | memset(bh->b_data, 0, blocksize); |
669 | branch[n].p = (__le32 *) bh->b_data + offsets[n]; | |
670 | branch[n].key = cpu_to_le32(new_blocks[n]); | |
671 | *branch[n].p = branch[n].key; | |
672 | if ( n == indirect_blks) { | |
673 | current_block = new_blocks[n]; | |
674 | /* | |
675 | * End of chain, update the last new metablock of | |
676 | * the chain to point to the new allocated | |
677 | * data blocks numbers | |
678 | */ | |
679 | for (i=1; i < num; i++) | |
680 | *(branch[n].p + i) = cpu_to_le32(++current_block); | |
1da177e4 | 681 | } |
b47b2478 MC |
682 | BUFFER_TRACE(bh, "marking uptodate"); |
683 | set_buffer_uptodate(bh); | |
684 | unlock_buffer(bh); | |
1da177e4 | 685 | |
b47b2478 MC |
686 | BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata"); |
687 | err = ext3_journal_dirty_metadata(handle, bh); | |
688 | if (err) | |
689 | goto failed; | |
690 | } | |
691 | *blks = num; | |
692 | return err; | |
693 | failed: | |
1da177e4 | 694 | /* Allocation failed, free what we already allocated */ |
b47b2478 | 695 | for (i = 1; i <= n ; i++) { |
1da177e4 LT |
696 | BUFFER_TRACE(branch[i].bh, "call journal_forget"); |
697 | ext3_journal_forget(handle, branch[i].bh); | |
698 | } | |
b47b2478 MC |
699 | for (i = 0; i <indirect_blks; i++) |
700 | ext3_free_blocks(handle, inode, new_blocks[i], 1); | |
701 | ||
702 | ext3_free_blocks(handle, inode, new_blocks[i], num); | |
703 | ||
1da177e4 LT |
704 | return err; |
705 | } | |
706 | ||
707 | /** | |
d6859bfc | 708 | * ext3_splice_branch - splice the allocated branch onto inode. |
a4c18ad2 | 709 | * @handle: handle for this transaction |
d6859bfc AM |
710 | * @inode: owner |
711 | * @block: (logical) number of block we are adding | |
d6859bfc AM |
712 | * @where: location of missing link |
713 | * @num: number of indirect blocks we are adding | |
714 | * @blks: number of direct blocks we are adding | |
715 | * | |
716 | * This function fills the missing link and does all housekeeping needed in | |
717 | * inode (->i_blocks, etc.). In case of success we end up with the full | |
718 | * chain to new block and return 0. | |
1da177e4 | 719 | */ |
d6859bfc AM |
720 | static int ext3_splice_branch(handle_t *handle, struct inode *inode, |
721 | long block, Indirect *where, int num, int blks) | |
1da177e4 LT |
722 | { |
723 | int i; | |
724 | int err = 0; | |
d6859bfc | 725 | struct ext3_block_alloc_info *block_i; |
43d23f90 | 726 | ext3_fsblk_t current_block; |
fe8bc91c | 727 | struct ext3_inode_info *ei = EXT3_I(inode); |
d6859bfc | 728 | |
fe8bc91c | 729 | block_i = ei->i_block_alloc_info; |
1da177e4 LT |
730 | /* |
731 | * If we're splicing into a [td]indirect block (as opposed to the | |
732 | * inode) then we need to get write access to the [td]indirect block | |
733 | * before the splice. | |
734 | */ | |
735 | if (where->bh) { | |
736 | BUFFER_TRACE(where->bh, "get_write_access"); | |
737 | err = ext3_journal_get_write_access(handle, where->bh); | |
738 | if (err) | |
739 | goto err_out; | |
740 | } | |
1da177e4 LT |
741 | /* That's it */ |
742 | ||
743 | *where->p = where->key; | |
d6859bfc AM |
744 | |
745 | /* | |
746 | * Update the host buffer_head or inode to point to more just allocated | |
747 | * direct blocks blocks | |
748 | */ | |
b47b2478 | 749 | if (num == 0 && blks > 1) { |
5dea5176 | 750 | current_block = le32_to_cpu(where->key) + 1; |
b47b2478 MC |
751 | for (i = 1; i < blks; i++) |
752 | *(where->p + i ) = cpu_to_le32(current_block++); | |
753 | } | |
1da177e4 LT |
754 | |
755 | /* | |
756 | * update the most recently allocated logical & physical block | |
757 | * in i_block_alloc_info, to assist find the proper goal block for next | |
758 | * allocation | |
759 | */ | |
760 | if (block_i) { | |
b47b2478 | 761 | block_i->last_alloc_logical_block = block + blks - 1; |
d6859bfc | 762 | block_i->last_alloc_physical_block = |
5dea5176 | 763 | le32_to_cpu(where[num].key) + blks - 1; |
1da177e4 LT |
764 | } |
765 | ||
766 | /* We are done with atomic stuff, now do the rest of housekeeping */ | |
767 | ||
768 | inode->i_ctime = CURRENT_TIME_SEC; | |
769 | ext3_mark_inode_dirty(handle, inode); | |
fe8bc91c JK |
770 | /* ext3_mark_inode_dirty already updated i_sync_tid */ |
771 | atomic_set(&ei->i_datasync_tid, handle->h_transaction->t_tid); | |
1da177e4 LT |
772 | |
773 | /* had we spliced it onto indirect block? */ | |
774 | if (where->bh) { | |
775 | /* | |
d6859bfc | 776 | * If we spliced it onto an indirect block, we haven't |
1da177e4 LT |
777 | * altered the inode. Note however that if it is being spliced |
778 | * onto an indirect block at the very end of the file (the | |
779 | * file is growing) then we *will* alter the inode to reflect | |
780 | * the new i_size. But that is not done here - it is done in | |
781 | * generic_commit_write->__mark_inode_dirty->ext3_dirty_inode. | |
782 | */ | |
783 | jbd_debug(5, "splicing indirect only\n"); | |
784 | BUFFER_TRACE(where->bh, "call ext3_journal_dirty_metadata"); | |
785 | err = ext3_journal_dirty_metadata(handle, where->bh); | |
ae6ddcc5 | 786 | if (err) |
1da177e4 LT |
787 | goto err_out; |
788 | } else { | |
789 | /* | |
790 | * OK, we spliced it into the inode itself on a direct block. | |
791 | * Inode was dirtied above. | |
792 | */ | |
793 | jbd_debug(5, "splicing direct\n"); | |
794 | } | |
795 | return err; | |
796 | ||
1da177e4 | 797 | err_out: |
b47b2478 | 798 | for (i = 1; i <= num; i++) { |
1da177e4 LT |
799 | BUFFER_TRACE(where[i].bh, "call journal_forget"); |
800 | ext3_journal_forget(handle, where[i].bh); | |
d6859bfc | 801 | ext3_free_blocks(handle,inode,le32_to_cpu(where[i-1].key),1); |
1da177e4 | 802 | } |
b47b2478 MC |
803 | ext3_free_blocks(handle, inode, le32_to_cpu(where[num].key), blks); |
804 | ||
1da177e4 LT |
805 | return err; |
806 | } | |
807 | ||
808 | /* | |
809 | * Allocation strategy is simple: if we have to allocate something, we will | |
810 | * have to go the whole way to leaf. So let's do it before attaching anything | |
811 | * to tree, set linkage between the newborn blocks, write them if sync is | |
812 | * required, recheck the path, free and repeat if check fails, otherwise | |
813 | * set the last missing link (that will protect us from any truncate-generated | |
814 | * removals - all blocks on the path are immune now) and possibly force the | |
815 | * write on the parent block. | |
816 | * That has a nice additional property: no special recovery from the failed | |
817 | * allocations is needed - we simply release blocks and do not touch anything | |
818 | * reachable from inode. | |
819 | * | |
d6859bfc | 820 | * `handle' can be NULL if create == 0. |
1da177e4 LT |
821 | * |
822 | * The BKL may not be held on entry here. Be sure to take it early. | |
89747d36 MC |
823 | * return > 0, # of blocks mapped or allocated. |
824 | * return = 0, if plain lookup failed. | |
825 | * return < 0, error case. | |
1da177e4 | 826 | */ |
d6859bfc AM |
827 | int ext3_get_blocks_handle(handle_t *handle, struct inode *inode, |
828 | sector_t iblock, unsigned long maxblocks, | |
829 | struct buffer_head *bh_result, | |
43237b54 | 830 | int create) |
1da177e4 LT |
831 | { |
832 | int err = -EIO; | |
833 | int offsets[4]; | |
834 | Indirect chain[4]; | |
835 | Indirect *partial; | |
43d23f90 | 836 | ext3_fsblk_t goal; |
b47b2478 | 837 | int indirect_blks; |
89747d36 MC |
838 | int blocks_to_boundary = 0; |
839 | int depth; | |
1da177e4 | 840 | struct ext3_inode_info *ei = EXT3_I(inode); |
89747d36 | 841 | int count = 0; |
43d23f90 | 842 | ext3_fsblk_t first_block = 0; |
89747d36 | 843 | |
1da177e4 LT |
844 | |
845 | J_ASSERT(handle != NULL || create == 0); | |
d6859bfc | 846 | depth = ext3_block_to_path(inode,iblock,offsets,&blocks_to_boundary); |
1da177e4 LT |
847 | |
848 | if (depth == 0) | |
849 | goto out; | |
850 | ||
1da177e4 LT |
851 | partial = ext3_get_branch(inode, depth, offsets, chain, &err); |
852 | ||
853 | /* Simplest case - block found, no allocation needed */ | |
854 | if (!partial) { | |
5dea5176 | 855 | first_block = le32_to_cpu(chain[depth - 1].key); |
1da177e4 | 856 | clear_buffer_new(bh_result); |
89747d36 MC |
857 | count++; |
858 | /*map more blocks*/ | |
859 | while (count < maxblocks && count <= blocks_to_boundary) { | |
43d23f90 | 860 | ext3_fsblk_t blk; |
5dea5176 | 861 | |
e8ef7aae | 862 | if (!verify_chain(chain, chain + depth - 1)) { |
89747d36 MC |
863 | /* |
864 | * Indirect block might be removed by | |
865 | * truncate while we were reading it. | |
866 | * Handling of that case: forget what we've | |
867 | * got now. Flag the err as EAGAIN, so it | |
868 | * will reread. | |
869 | */ | |
870 | err = -EAGAIN; | |
871 | count = 0; | |
872 | break; | |
873 | } | |
5dea5176 MC |
874 | blk = le32_to_cpu(*(chain[depth-1].p + count)); |
875 | ||
876 | if (blk == first_block + count) | |
89747d36 MC |
877 | count++; |
878 | else | |
879 | break; | |
880 | } | |
881 | if (err != -EAGAIN) | |
882 | goto got_it; | |
1da177e4 LT |
883 | } |
884 | ||
885 | /* Next simple case - plain lookup or failed read of indirect block */ | |
fe55c452 MC |
886 | if (!create || err == -EIO) |
887 | goto cleanup; | |
888 | ||
97461518 | 889 | mutex_lock(&ei->truncate_mutex); |
fe55c452 MC |
890 | |
891 | /* | |
892 | * If the indirect block is missing while we are reading | |
893 | * the chain(ext3_get_branch() returns -EAGAIN err), or | |
894 | * if the chain has been changed after we grab the semaphore, | |
895 | * (either because another process truncated this branch, or | |
896 | * another get_block allocated this branch) re-grab the chain to see if | |
897 | * the request block has been allocated or not. | |
898 | * | |
899 | * Since we already block the truncate/other get_block | |
900 | * at this point, we will have the current copy of the chain when we | |
901 | * splice the branch into the tree. | |
902 | */ | |
903 | if (err == -EAGAIN || !verify_chain(chain, partial)) { | |
1da177e4 | 904 | while (partial > chain) { |
1da177e4 LT |
905 | brelse(partial->bh); |
906 | partial--; | |
907 | } | |
fe55c452 MC |
908 | partial = ext3_get_branch(inode, depth, offsets, chain, &err); |
909 | if (!partial) { | |
89747d36 | 910 | count++; |
97461518 | 911 | mutex_unlock(&ei->truncate_mutex); |
fe55c452 MC |
912 | if (err) |
913 | goto cleanup; | |
914 | clear_buffer_new(bh_result); | |
915 | goto got_it; | |
916 | } | |
1da177e4 LT |
917 | } |
918 | ||
919 | /* | |
fe55c452 MC |
920 | * Okay, we need to do block allocation. Lazily initialize the block |
921 | * allocation info here if necessary | |
922 | */ | |
923 | if (S_ISREG(inode->i_mode) && (!ei->i_block_alloc_info)) | |
1da177e4 | 924 | ext3_init_block_alloc_info(inode); |
1da177e4 | 925 | |
fb01bfda | 926 | goal = ext3_find_goal(inode, iblock, partial); |
1da177e4 | 927 | |
b47b2478 MC |
928 | /* the number of blocks need to allocate for [d,t]indirect blocks */ |
929 | indirect_blks = (chain + depth) - partial - 1; | |
1da177e4 | 930 | |
b47b2478 MC |
931 | /* |
932 | * Next look up the indirect map to count the totoal number of | |
933 | * direct blocks to allocate for this branch. | |
934 | */ | |
935 | count = ext3_blks_to_allocate(partial, indirect_blks, | |
936 | maxblocks, blocks_to_boundary); | |
1da177e4 LT |
937 | /* |
938 | * Block out ext3_truncate while we alter the tree | |
939 | */ | |
b47b2478 | 940 | err = ext3_alloc_branch(handle, inode, indirect_blks, &count, goal, |
fe55c452 | 941 | offsets + (partial - chain), partial); |
1da177e4 | 942 | |
fe55c452 MC |
943 | /* |
944 | * The ext3_splice_branch call will free and forget any buffers | |
1da177e4 LT |
945 | * on the new chain if there is a failure, but that risks using |
946 | * up transaction credits, especially for bitmaps where the | |
947 | * credits cannot be returned. Can we handle this somehow? We | |
fe55c452 MC |
948 | * may need to return -EAGAIN upwards in the worst case. --sct |
949 | */ | |
1da177e4 | 950 | if (!err) |
b47b2478 MC |
951 | err = ext3_splice_branch(handle, inode, iblock, |
952 | partial, indirect_blks, count); | |
97461518 | 953 | mutex_unlock(&ei->truncate_mutex); |
1da177e4 LT |
954 | if (err) |
955 | goto cleanup; | |
956 | ||
957 | set_buffer_new(bh_result); | |
fe55c452 MC |
958 | got_it: |
959 | map_bh(bh_result, inode->i_sb, le32_to_cpu(chain[depth-1].key)); | |
20acaa18 | 960 | if (count > blocks_to_boundary) |
fe55c452 | 961 | set_buffer_boundary(bh_result); |
89747d36 | 962 | err = count; |
fe55c452 MC |
963 | /* Clean up and exit */ |
964 | partial = chain + depth - 1; /* the whole chain */ | |
965 | cleanup: | |
1da177e4 | 966 | while (partial > chain) { |
fe55c452 | 967 | BUFFER_TRACE(partial->bh, "call brelse"); |
1da177e4 LT |
968 | brelse(partial->bh); |
969 | partial--; | |
970 | } | |
fe55c452 MC |
971 | BUFFER_TRACE(bh_result, "returned"); |
972 | out: | |
973 | return err; | |
1da177e4 LT |
974 | } |
975 | ||
bd1939de JK |
976 | /* Maximum number of blocks we map for direct IO at once. */ |
977 | #define DIO_MAX_BLOCKS 4096 | |
978 | /* | |
979 | * Number of credits we need for writing DIO_MAX_BLOCKS: | |
980 | * We need sb + group descriptor + bitmap + inode -> 4 | |
981 | * For B blocks with A block pointers per block we need: | |
982 | * 1 (triple ind.) + (B/A/A + 2) (doubly ind.) + (B/A + 2) (indirect). | |
983 | * If we plug in 4096 for B and 256 for A (for 1KB block size), we get 25. | |
984 | */ | |
985 | #define DIO_CREDITS 25 | |
1da177e4 | 986 | |
f91a2ad2 BP |
987 | static int ext3_get_block(struct inode *inode, sector_t iblock, |
988 | struct buffer_head *bh_result, int create) | |
1da177e4 | 989 | { |
3e4fdaf8 | 990 | handle_t *handle = ext3_journal_current_handle(); |
bd1939de | 991 | int ret = 0, started = 0; |
1d8fa7a2 | 992 | unsigned max_blocks = bh_result->b_size >> inode->i_blkbits; |
1da177e4 | 993 | |
bd1939de JK |
994 | if (create && !handle) { /* Direct IO write... */ |
995 | if (max_blocks > DIO_MAX_BLOCKS) | |
996 | max_blocks = DIO_MAX_BLOCKS; | |
997 | handle = ext3_journal_start(inode, DIO_CREDITS + | |
c459001f | 998 | EXT3_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb)); |
bd1939de | 999 | if (IS_ERR(handle)) { |
1da177e4 | 1000 | ret = PTR_ERR(handle); |
bd1939de | 1001 | goto out; |
1da177e4 | 1002 | } |
bd1939de | 1003 | started = 1; |
1da177e4 LT |
1004 | } |
1005 | ||
bd1939de | 1006 | ret = ext3_get_blocks_handle(handle, inode, iblock, |
43237b54 | 1007 | max_blocks, bh_result, create); |
bd1939de JK |
1008 | if (ret > 0) { |
1009 | bh_result->b_size = (ret << inode->i_blkbits); | |
1010 | ret = 0; | |
89747d36 | 1011 | } |
bd1939de JK |
1012 | if (started) |
1013 | ext3_journal_stop(handle); | |
1014 | out: | |
1da177e4 LT |
1015 | return ret; |
1016 | } | |
1017 | ||
68c9d702 JB |
1018 | int ext3_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
1019 | u64 start, u64 len) | |
1020 | { | |
1021 | return generic_block_fiemap(inode, fieinfo, start, len, | |
1022 | ext3_get_block); | |
1023 | } | |
1024 | ||
1da177e4 LT |
1025 | /* |
1026 | * `handle' can be NULL if create is zero | |
1027 | */ | |
d6859bfc AM |
1028 | struct buffer_head *ext3_getblk(handle_t *handle, struct inode *inode, |
1029 | long block, int create, int *errp) | |
1da177e4 LT |
1030 | { |
1031 | struct buffer_head dummy; | |
1032 | int fatal = 0, err; | |
1033 | ||
1034 | J_ASSERT(handle != NULL || create == 0); | |
1035 | ||
1036 | dummy.b_state = 0; | |
1037 | dummy.b_blocknr = -1000; | |
1038 | buffer_trace_init(&dummy.b_history); | |
89747d36 | 1039 | err = ext3_get_blocks_handle(handle, inode, block, 1, |
43237b54 | 1040 | &dummy, create); |
3665d0e5 BP |
1041 | /* |
1042 | * ext3_get_blocks_handle() returns number of blocks | |
1043 | * mapped. 0 in case of a HOLE. | |
1044 | */ | |
1045 | if (err > 0) { | |
1046 | if (err > 1) | |
1047 | WARN_ON(1); | |
89747d36 | 1048 | err = 0; |
89747d36 MC |
1049 | } |
1050 | *errp = err; | |
1051 | if (!err && buffer_mapped(&dummy)) { | |
1da177e4 LT |
1052 | struct buffer_head *bh; |
1053 | bh = sb_getblk(inode->i_sb, dummy.b_blocknr); | |
2973dfdb GOC |
1054 | if (!bh) { |
1055 | *errp = -EIO; | |
1056 | goto err; | |
1057 | } | |
1da177e4 LT |
1058 | if (buffer_new(&dummy)) { |
1059 | J_ASSERT(create != 0); | |
c80544dc | 1060 | J_ASSERT(handle != NULL); |
1da177e4 | 1061 | |
d6859bfc AM |
1062 | /* |
1063 | * Now that we do not always journal data, we should | |
1064 | * keep in mind whether this should always journal the | |
1065 | * new buffer as metadata. For now, regular file | |
1066 | * writes use ext3_get_block instead, so it's not a | |
1067 | * problem. | |
1068 | */ | |
1da177e4 LT |
1069 | lock_buffer(bh); |
1070 | BUFFER_TRACE(bh, "call get_create_access"); | |
1071 | fatal = ext3_journal_get_create_access(handle, bh); | |
1072 | if (!fatal && !buffer_uptodate(bh)) { | |
d6859bfc | 1073 | memset(bh->b_data,0,inode->i_sb->s_blocksize); |
1da177e4 LT |
1074 | set_buffer_uptodate(bh); |
1075 | } | |
1076 | unlock_buffer(bh); | |
1077 | BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata"); | |
1078 | err = ext3_journal_dirty_metadata(handle, bh); | |
1079 | if (!fatal) | |
1080 | fatal = err; | |
1081 | } else { | |
1082 | BUFFER_TRACE(bh, "not a new buffer"); | |
1083 | } | |
1084 | if (fatal) { | |
1085 | *errp = fatal; | |
1086 | brelse(bh); | |
1087 | bh = NULL; | |
1088 | } | |
1089 | return bh; | |
1090 | } | |
2973dfdb | 1091 | err: |
1da177e4 LT |
1092 | return NULL; |
1093 | } | |
1094 | ||
d6859bfc | 1095 | struct buffer_head *ext3_bread(handle_t *handle, struct inode *inode, |
1da177e4 LT |
1096 | int block, int create, int *err) |
1097 | { | |
1098 | struct buffer_head * bh; | |
1099 | ||
1100 | bh = ext3_getblk(handle, inode, block, create, err); | |
1101 | if (!bh) | |
1102 | return bh; | |
1103 | if (buffer_uptodate(bh)) | |
1104 | return bh; | |
caa38fb0 | 1105 | ll_rw_block(READ_META, 1, &bh); |
1da177e4 LT |
1106 | wait_on_buffer(bh); |
1107 | if (buffer_uptodate(bh)) | |
1108 | return bh; | |
1109 | put_bh(bh); | |
1110 | *err = -EIO; | |
1111 | return NULL; | |
1112 | } | |
1113 | ||
1114 | static int walk_page_buffers( handle_t *handle, | |
1115 | struct buffer_head *head, | |
1116 | unsigned from, | |
1117 | unsigned to, | |
1118 | int *partial, | |
1119 | int (*fn)( handle_t *handle, | |
1120 | struct buffer_head *bh)) | |
1121 | { | |
1122 | struct buffer_head *bh; | |
1123 | unsigned block_start, block_end; | |
1124 | unsigned blocksize = head->b_size; | |
1125 | int err, ret = 0; | |
1126 | struct buffer_head *next; | |
1127 | ||
1128 | for ( bh = head, block_start = 0; | |
1129 | ret == 0 && (bh != head || !block_start); | |
e9ad5620 | 1130 | block_start = block_end, bh = next) |
1da177e4 LT |
1131 | { |
1132 | next = bh->b_this_page; | |
1133 | block_end = block_start + blocksize; | |
1134 | if (block_end <= from || block_start >= to) { | |
1135 | if (partial && !buffer_uptodate(bh)) | |
1136 | *partial = 1; | |
1137 | continue; | |
1138 | } | |
1139 | err = (*fn)(handle, bh); | |
1140 | if (!ret) | |
1141 | ret = err; | |
1142 | } | |
1143 | return ret; | |
1144 | } | |
1145 | ||
1146 | /* | |
1147 | * To preserve ordering, it is essential that the hole instantiation and | |
1148 | * the data write be encapsulated in a single transaction. We cannot | |
1149 | * close off a transaction and start a new one between the ext3_get_block() | |
1150 | * and the commit_write(). So doing the journal_start at the start of | |
1151 | * prepare_write() is the right place. | |
1152 | * | |
1153 | * Also, this function can nest inside ext3_writepage() -> | |
1154 | * block_write_full_page(). In that case, we *know* that ext3_writepage() | |
1155 | * has generated enough buffer credits to do the whole page. So we won't | |
1156 | * block on the journal in that case, which is good, because the caller may | |
1157 | * be PF_MEMALLOC. | |
1158 | * | |
1159 | * By accident, ext3 can be reentered when a transaction is open via | |
1160 | * quota file writes. If we were to commit the transaction while thus | |
1161 | * reentered, there can be a deadlock - we would be holding a quota | |
1162 | * lock, and the commit would never complete if another thread had a | |
1163 | * transaction open and was blocking on the quota lock - a ranking | |
1164 | * violation. | |
1165 | * | |
1166 | * So what we do is to rely on the fact that journal_stop/journal_start | |
1167 | * will _not_ run commit under these circumstances because handle->h_ref | |
1168 | * is elevated. We'll still have enough credits for the tiny quotafile | |
ae6ddcc5 | 1169 | * write. |
1da177e4 | 1170 | */ |
d6859bfc AM |
1171 | static int do_journal_get_write_access(handle_t *handle, |
1172 | struct buffer_head *bh) | |
1da177e4 | 1173 | { |
5f11e6a4 JK |
1174 | int dirty = buffer_dirty(bh); |
1175 | int ret; | |
1176 | ||
1da177e4 LT |
1177 | if (!buffer_mapped(bh) || buffer_freed(bh)) |
1178 | return 0; | |
5f11e6a4 JK |
1179 | /* |
1180 | * __block_prepare_write() could have dirtied some buffers. Clean | |
1181 | * the dirty bit as jbd2_journal_get_write_access() could complain | |
1182 | * otherwise about fs integrity issues. Setting of the dirty bit | |
1183 | * by __block_prepare_write() isn't a real problem here as we clear | |
1184 | * the bit before releasing a page lock and thus writeback cannot | |
1185 | * ever write the buffer. | |
1186 | */ | |
1187 | if (dirty) | |
1188 | clear_buffer_dirty(bh); | |
1189 | ret = ext3_journal_get_write_access(handle, bh); | |
1190 | if (!ret && dirty) | |
1191 | ret = ext3_journal_dirty_metadata(handle, bh); | |
1192 | return ret; | |
1da177e4 LT |
1193 | } |
1194 | ||
68eb3db0 JK |
1195 | /* |
1196 | * Truncate blocks that were not used by write. We have to truncate the | |
1197 | * pagecache as well so that corresponding buffers get properly unmapped. | |
1198 | */ | |
1199 | static void ext3_truncate_failed_write(struct inode *inode) | |
1200 | { | |
1201 | truncate_inode_pages(inode->i_mapping, inode->i_size); | |
1202 | ext3_truncate(inode); | |
1203 | } | |
1204 | ||
f4fc66a8 NP |
1205 | static int ext3_write_begin(struct file *file, struct address_space *mapping, |
1206 | loff_t pos, unsigned len, unsigned flags, | |
1207 | struct page **pagep, void **fsdata) | |
1da177e4 | 1208 | { |
f4fc66a8 | 1209 | struct inode *inode = mapping->host; |
695f6ae0 | 1210 | int ret; |
1da177e4 LT |
1211 | handle_t *handle; |
1212 | int retries = 0; | |
f4fc66a8 NP |
1213 | struct page *page; |
1214 | pgoff_t index; | |
1215 | unsigned from, to; | |
695f6ae0 JK |
1216 | /* Reserve one block more for addition to orphan list in case |
1217 | * we allocate blocks but write fails for some reason */ | |
1218 | int needed_blocks = ext3_writepage_trans_blocks(inode) + 1; | |
f4fc66a8 NP |
1219 | |
1220 | index = pos >> PAGE_CACHE_SHIFT; | |
1221 | from = pos & (PAGE_CACHE_SIZE - 1); | |
1222 | to = from + len; | |
1da177e4 LT |
1223 | |
1224 | retry: | |
54566b2c | 1225 | page = grab_cache_page_write_begin(mapping, index, flags); |
f4fc66a8 NP |
1226 | if (!page) |
1227 | return -ENOMEM; | |
1228 | *pagep = page; | |
1229 | ||
1da177e4 | 1230 | handle = ext3_journal_start(inode, needed_blocks); |
1aa9b4b9 | 1231 | if (IS_ERR(handle)) { |
f4fc66a8 NP |
1232 | unlock_page(page); |
1233 | page_cache_release(page); | |
1aa9b4b9 AM |
1234 | ret = PTR_ERR(handle); |
1235 | goto out; | |
1236 | } | |
6e1db88d | 1237 | ret = __block_write_begin(page, pos, len, ext3_get_block); |
1da177e4 | 1238 | if (ret) |
f4fc66a8 | 1239 | goto write_begin_failed; |
1da177e4 LT |
1240 | |
1241 | if (ext3_should_journal_data(inode)) { | |
1242 | ret = walk_page_buffers(handle, page_buffers(page), | |
1243 | from, to, NULL, do_journal_get_write_access); | |
1244 | } | |
f4fc66a8 NP |
1245 | write_begin_failed: |
1246 | if (ret) { | |
5ec8b75e AK |
1247 | /* |
1248 | * block_write_begin may have instantiated a few blocks | |
1249 | * outside i_size. Trim these off again. Don't need | |
1250 | * i_size_read because we hold i_mutex. | |
695f6ae0 JK |
1251 | * |
1252 | * Add inode to orphan list in case we crash before truncate | |
9eaaa2d5 JK |
1253 | * finishes. Do this only if ext3_can_truncate() agrees so |
1254 | * that orphan processing code is happy. | |
5ec8b75e | 1255 | */ |
9eaaa2d5 | 1256 | if (pos + len > inode->i_size && ext3_can_truncate(inode)) |
695f6ae0 JK |
1257 | ext3_orphan_add(handle, inode); |
1258 | ext3_journal_stop(handle); | |
1259 | unlock_page(page); | |
1260 | page_cache_release(page); | |
5ec8b75e | 1261 | if (pos + len > inode->i_size) |
68eb3db0 | 1262 | ext3_truncate_failed_write(inode); |
f4fc66a8 | 1263 | } |
1da177e4 LT |
1264 | if (ret == -ENOSPC && ext3_should_retry_alloc(inode->i_sb, &retries)) |
1265 | goto retry; | |
1aa9b4b9 | 1266 | out: |
1da177e4 LT |
1267 | return ret; |
1268 | } | |
1269 | ||
f4fc66a8 | 1270 | |
d6859bfc | 1271 | int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh) |
1da177e4 LT |
1272 | { |
1273 | int err = journal_dirty_data(handle, bh); | |
1274 | if (err) | |
e05b6b52 | 1275 | ext3_journal_abort_handle(__func__, __func__, |
f4fc66a8 | 1276 | bh, handle, err); |
1da177e4 LT |
1277 | return err; |
1278 | } | |
1279 | ||
695f6ae0 JK |
1280 | /* For ordered writepage and write_end functions */ |
1281 | static int journal_dirty_data_fn(handle_t *handle, struct buffer_head *bh) | |
1282 | { | |
1283 | /* | |
1284 | * Write could have mapped the buffer but it didn't copy the data in | |
1285 | * yet. So avoid filing such buffer into a transaction. | |
1286 | */ | |
1287 | if (buffer_mapped(bh) && buffer_uptodate(bh)) | |
1288 | return ext3_journal_dirty_data(handle, bh); | |
1289 | return 0; | |
1290 | } | |
1291 | ||
f4fc66a8 NP |
1292 | /* For write_end() in data=journal mode */ |
1293 | static int write_end_fn(handle_t *handle, struct buffer_head *bh) | |
1da177e4 LT |
1294 | { |
1295 | if (!buffer_mapped(bh) || buffer_freed(bh)) | |
1296 | return 0; | |
1297 | set_buffer_uptodate(bh); | |
1298 | return ext3_journal_dirty_metadata(handle, bh); | |
1299 | } | |
1300 | ||
f4fc66a8 | 1301 | /* |
695f6ae0 JK |
1302 | * This is nasty and subtle: ext3_write_begin() could have allocated blocks |
1303 | * for the whole page but later we failed to copy the data in. Update inode | |
1304 | * size according to what we managed to copy. The rest is going to be | |
1305 | * truncated in write_end function. | |
f4fc66a8 | 1306 | */ |
695f6ae0 | 1307 | static void update_file_sizes(struct inode *inode, loff_t pos, unsigned copied) |
f4fc66a8 | 1308 | { |
695f6ae0 JK |
1309 | /* What matters to us is i_disksize. We don't write i_size anywhere */ |
1310 | if (pos + copied > inode->i_size) | |
1311 | i_size_write(inode, pos + copied); | |
1312 | if (pos + copied > EXT3_I(inode)->i_disksize) { | |
1313 | EXT3_I(inode)->i_disksize = pos + copied; | |
f4fc66a8 NP |
1314 | mark_inode_dirty(inode); |
1315 | } | |
f4fc66a8 NP |
1316 | } |
1317 | ||
1da177e4 LT |
1318 | /* |
1319 | * We need to pick up the new inode size which generic_commit_write gave us | |
1320 | * `file' can be NULL - eg, when called from page_symlink(). | |
1321 | * | |
1322 | * ext3 never places buffers on inode->i_mapping->private_list. metadata | |
1323 | * buffers are managed internally. | |
1324 | */ | |
f4fc66a8 NP |
1325 | static int ext3_ordered_write_end(struct file *file, |
1326 | struct address_space *mapping, | |
1327 | loff_t pos, unsigned len, unsigned copied, | |
1328 | struct page *page, void *fsdata) | |
1da177e4 LT |
1329 | { |
1330 | handle_t *handle = ext3_journal_current_handle(); | |
f4fc66a8 NP |
1331 | struct inode *inode = file->f_mapping->host; |
1332 | unsigned from, to; | |
1da177e4 LT |
1333 | int ret = 0, ret2; |
1334 | ||
695f6ae0 | 1335 | copied = block_write_end(file, mapping, pos, len, copied, page, fsdata); |
f4fc66a8 | 1336 | |
695f6ae0 JK |
1337 | from = pos & (PAGE_CACHE_SIZE - 1); |
1338 | to = from + copied; | |
1da177e4 | 1339 | ret = walk_page_buffers(handle, page_buffers(page), |
695f6ae0 | 1340 | from, to, NULL, journal_dirty_data_fn); |
1da177e4 | 1341 | |
695f6ae0 JK |
1342 | if (ret == 0) |
1343 | update_file_sizes(inode, pos, copied); | |
1344 | /* | |
1345 | * There may be allocated blocks outside of i_size because | |
1346 | * we failed to copy some data. Prepare for truncate. | |
1347 | */ | |
9eaaa2d5 | 1348 | if (pos + len > inode->i_size && ext3_can_truncate(inode)) |
695f6ae0 | 1349 | ext3_orphan_add(handle, inode); |
1da177e4 LT |
1350 | ret2 = ext3_journal_stop(handle); |
1351 | if (!ret) | |
1352 | ret = ret2; | |
f4fc66a8 NP |
1353 | unlock_page(page); |
1354 | page_cache_release(page); | |
1355 | ||
695f6ae0 | 1356 | if (pos + len > inode->i_size) |
68eb3db0 | 1357 | ext3_truncate_failed_write(inode); |
f4fc66a8 | 1358 | return ret ? ret : copied; |
1da177e4 LT |
1359 | } |
1360 | ||
f4fc66a8 NP |
1361 | static int ext3_writeback_write_end(struct file *file, |
1362 | struct address_space *mapping, | |
1363 | loff_t pos, unsigned len, unsigned copied, | |
1364 | struct page *page, void *fsdata) | |
1da177e4 LT |
1365 | { |
1366 | handle_t *handle = ext3_journal_current_handle(); | |
f4fc66a8 | 1367 | struct inode *inode = file->f_mapping->host; |
695f6ae0 | 1368 | int ret; |
1da177e4 | 1369 | |
695f6ae0 JK |
1370 | copied = block_write_end(file, mapping, pos, len, copied, page, fsdata); |
1371 | update_file_sizes(inode, pos, copied); | |
1372 | /* | |
1373 | * There may be allocated blocks outside of i_size because | |
1374 | * we failed to copy some data. Prepare for truncate. | |
1375 | */ | |
9eaaa2d5 | 1376 | if (pos + len > inode->i_size && ext3_can_truncate(inode)) |
695f6ae0 JK |
1377 | ext3_orphan_add(handle, inode); |
1378 | ret = ext3_journal_stop(handle); | |
f4fc66a8 NP |
1379 | unlock_page(page); |
1380 | page_cache_release(page); | |
1381 | ||
695f6ae0 | 1382 | if (pos + len > inode->i_size) |
68eb3db0 | 1383 | ext3_truncate_failed_write(inode); |
f4fc66a8 | 1384 | return ret ? ret : copied; |
1da177e4 LT |
1385 | } |
1386 | ||
f4fc66a8 NP |
1387 | static int ext3_journalled_write_end(struct file *file, |
1388 | struct address_space *mapping, | |
1389 | loff_t pos, unsigned len, unsigned copied, | |
1390 | struct page *page, void *fsdata) | |
1da177e4 LT |
1391 | { |
1392 | handle_t *handle = ext3_journal_current_handle(); | |
f4fc66a8 | 1393 | struct inode *inode = mapping->host; |
1da177e4 LT |
1394 | int ret = 0, ret2; |
1395 | int partial = 0; | |
f4fc66a8 | 1396 | unsigned from, to; |
1da177e4 | 1397 | |
f4fc66a8 NP |
1398 | from = pos & (PAGE_CACHE_SIZE - 1); |
1399 | to = from + len; | |
1400 | ||
1401 | if (copied < len) { | |
1402 | if (!PageUptodate(page)) | |
1403 | copied = 0; | |
695f6ae0 JK |
1404 | page_zero_new_buffers(page, from + copied, to); |
1405 | to = from + copied; | |
f4fc66a8 | 1406 | } |
1da177e4 LT |
1407 | |
1408 | ret = walk_page_buffers(handle, page_buffers(page), from, | |
f4fc66a8 | 1409 | to, &partial, write_end_fn); |
1da177e4 LT |
1410 | if (!partial) |
1411 | SetPageUptodate(page); | |
695f6ae0 JK |
1412 | |
1413 | if (pos + copied > inode->i_size) | |
1414 | i_size_write(inode, pos + copied); | |
1415 | /* | |
1416 | * There may be allocated blocks outside of i_size because | |
1417 | * we failed to copy some data. Prepare for truncate. | |
1418 | */ | |
9eaaa2d5 | 1419 | if (pos + len > inode->i_size && ext3_can_truncate(inode)) |
695f6ae0 | 1420 | ext3_orphan_add(handle, inode); |
9df93939 | 1421 | ext3_set_inode_state(inode, EXT3_STATE_JDATA); |
1da177e4 LT |
1422 | if (inode->i_size > EXT3_I(inode)->i_disksize) { |
1423 | EXT3_I(inode)->i_disksize = inode->i_size; | |
1424 | ret2 = ext3_mark_inode_dirty(handle, inode); | |
ae6ddcc5 | 1425 | if (!ret) |
1da177e4 LT |
1426 | ret = ret2; |
1427 | } | |
f4fc66a8 | 1428 | |
1da177e4 LT |
1429 | ret2 = ext3_journal_stop(handle); |
1430 | if (!ret) | |
1431 | ret = ret2; | |
f4fc66a8 NP |
1432 | unlock_page(page); |
1433 | page_cache_release(page); | |
1434 | ||
695f6ae0 | 1435 | if (pos + len > inode->i_size) |
68eb3db0 | 1436 | ext3_truncate_failed_write(inode); |
f4fc66a8 | 1437 | return ret ? ret : copied; |
1da177e4 LT |
1438 | } |
1439 | ||
ae6ddcc5 | 1440 | /* |
1da177e4 LT |
1441 | * bmap() is special. It gets used by applications such as lilo and by |
1442 | * the swapper to find the on-disk block of a specific piece of data. | |
1443 | * | |
1444 | * Naturally, this is dangerous if the block concerned is still in the | |
1445 | * journal. If somebody makes a swapfile on an ext3 data-journaling | |
1446 | * filesystem and enables swap, then they may get a nasty shock when the | |
1447 | * data getting swapped to that swapfile suddenly gets overwritten by | |
1448 | * the original zero's written out previously to the journal and | |
ae6ddcc5 | 1449 | * awaiting writeback in the kernel's buffer cache. |
1da177e4 LT |
1450 | * |
1451 | * So, if we see any bmap calls here on a modified, data-journaled file, | |
ae6ddcc5 | 1452 | * take extra steps to flush any blocks which might be in the cache. |
1da177e4 LT |
1453 | */ |
1454 | static sector_t ext3_bmap(struct address_space *mapping, sector_t block) | |
1455 | { | |
1456 | struct inode *inode = mapping->host; | |
1457 | journal_t *journal; | |
1458 | int err; | |
1459 | ||
9df93939 | 1460 | if (ext3_test_inode_state(inode, EXT3_STATE_JDATA)) { |
ae6ddcc5 | 1461 | /* |
1da177e4 LT |
1462 | * This is a REALLY heavyweight approach, but the use of |
1463 | * bmap on dirty files is expected to be extremely rare: | |
1464 | * only if we run lilo or swapon on a freshly made file | |
ae6ddcc5 | 1465 | * do we expect this to happen. |
1da177e4 LT |
1466 | * |
1467 | * (bmap requires CAP_SYS_RAWIO so this does not | |
1468 | * represent an unprivileged user DOS attack --- we'd be | |
1469 | * in trouble if mortal users could trigger this path at | |
ae6ddcc5 | 1470 | * will.) |
1da177e4 LT |
1471 | * |
1472 | * NB. EXT3_STATE_JDATA is not set on files other than | |
1473 | * regular files. If somebody wants to bmap a directory | |
1474 | * or symlink and gets confused because the buffer | |
1475 | * hasn't yet been flushed to disk, they deserve | |
1476 | * everything they get. | |
1477 | */ | |
1478 | ||
9df93939 | 1479 | ext3_clear_inode_state(inode, EXT3_STATE_JDATA); |
1da177e4 LT |
1480 | journal = EXT3_JOURNAL(inode); |
1481 | journal_lock_updates(journal); | |
1482 | err = journal_flush(journal); | |
1483 | journal_unlock_updates(journal); | |
1484 | ||
1485 | if (err) | |
1486 | return 0; | |
1487 | } | |
1488 | ||
1489 | return generic_block_bmap(mapping,block,ext3_get_block); | |
1490 | } | |
1491 | ||
1492 | static int bget_one(handle_t *handle, struct buffer_head *bh) | |
1493 | { | |
1494 | get_bh(bh); | |
1495 | return 0; | |
1496 | } | |
1497 | ||
1498 | static int bput_one(handle_t *handle, struct buffer_head *bh) | |
1499 | { | |
1500 | put_bh(bh); | |
1501 | return 0; | |
1502 | } | |
1503 | ||
9e80d407 JK |
1504 | static int buffer_unmapped(handle_t *handle, struct buffer_head *bh) |
1505 | { | |
1506 | return !buffer_mapped(bh); | |
1507 | } | |
695f6ae0 | 1508 | |
1da177e4 LT |
1509 | /* |
1510 | * Note that we always start a transaction even if we're not journalling | |
1511 | * data. This is to preserve ordering: any hole instantiation within | |
1512 | * __block_write_full_page -> ext3_get_block() should be journalled | |
1513 | * along with the data so we don't crash and then get metadata which | |
1514 | * refers to old data. | |
1515 | * | |
1516 | * In all journalling modes block_write_full_page() will start the I/O. | |
1517 | * | |
1518 | * Problem: | |
1519 | * | |
1520 | * ext3_writepage() -> kmalloc() -> __alloc_pages() -> page_launder() -> | |
1521 | * ext3_writepage() | |
1522 | * | |
1523 | * Similar for: | |
1524 | * | |
1525 | * ext3_file_write() -> generic_file_write() -> __alloc_pages() -> ... | |
1526 | * | |
1527 | * Same applies to ext3_get_block(). We will deadlock on various things like | |
97461518 | 1528 | * lock_journal and i_truncate_mutex. |
1da177e4 LT |
1529 | * |
1530 | * Setting PF_MEMALLOC here doesn't work - too many internal memory | |
1531 | * allocations fail. | |
1532 | * | |
1533 | * 16May01: If we're reentered then journal_current_handle() will be | |
1534 | * non-zero. We simply *return*. | |
1535 | * | |
1536 | * 1 July 2001: @@@ FIXME: | |
1537 | * In journalled data mode, a data buffer may be metadata against the | |
1538 | * current transaction. But the same file is part of a shared mapping | |
1539 | * and someone does a writepage() on it. | |
1540 | * | |
1541 | * We will move the buffer onto the async_data list, but *after* it has | |
1542 | * been dirtied. So there's a small window where we have dirty data on | |
1543 | * BJ_Metadata. | |
1544 | * | |
1545 | * Note that this only applies to the last partial page in the file. The | |
1546 | * bit which block_write_full_page() uses prepare/commit for. (That's | |
1547 | * broken code anyway: it's wrong for msync()). | |
1548 | * | |
1549 | * It's a rare case: affects the final partial page, for journalled data | |
1550 | * where the file is subject to bith write() and writepage() in the same | |
1551 | * transction. To fix it we'll need a custom block_write_full_page(). | |
1552 | * We'll probably need that anyway for journalling writepage() output. | |
1553 | * | |
1554 | * We don't honour synchronous mounts for writepage(). That would be | |
1555 | * disastrous. Any write() or metadata operation will sync the fs for | |
1556 | * us. | |
1557 | * | |
1558 | * AKPM2: if all the page's buffers are mapped to disk and !data=journal, | |
1559 | * we don't need to open a transaction here. | |
1560 | */ | |
1561 | static int ext3_ordered_writepage(struct page *page, | |
d6859bfc | 1562 | struct writeback_control *wbc) |
1da177e4 LT |
1563 | { |
1564 | struct inode *inode = page->mapping->host; | |
1565 | struct buffer_head *page_bufs; | |
1566 | handle_t *handle = NULL; | |
1567 | int ret = 0; | |
1568 | int err; | |
1569 | ||
1570 | J_ASSERT(PageLocked(page)); | |
49792c80 | 1571 | WARN_ON_ONCE(IS_RDONLY(inode)); |
1da177e4 LT |
1572 | |
1573 | /* | |
1574 | * We give up here if we're reentered, because it might be for a | |
1575 | * different filesystem. | |
1576 | */ | |
1577 | if (ext3_journal_current_handle()) | |
1578 | goto out_fail; | |
1579 | ||
9e80d407 JK |
1580 | if (!page_has_buffers(page)) { |
1581 | create_empty_buffers(page, inode->i_sb->s_blocksize, | |
1582 | (1 << BH_Dirty)|(1 << BH_Uptodate)); | |
430db323 JK |
1583 | page_bufs = page_buffers(page); |
1584 | } else { | |
1585 | page_bufs = page_buffers(page); | |
1586 | if (!walk_page_buffers(NULL, page_bufs, 0, PAGE_CACHE_SIZE, | |
1587 | NULL, buffer_unmapped)) { | |
1588 | /* Provide NULL get_block() to catch bugs if buffers | |
1589 | * weren't really mapped */ | |
1590 | return block_write_full_page(page, NULL, wbc); | |
1591 | } | |
9e80d407 | 1592 | } |
1da177e4 LT |
1593 | handle = ext3_journal_start(inode, ext3_writepage_trans_blocks(inode)); |
1594 | ||
1595 | if (IS_ERR(handle)) { | |
1596 | ret = PTR_ERR(handle); | |
1597 | goto out_fail; | |
1598 | } | |
1599 | ||
1da177e4 LT |
1600 | walk_page_buffers(handle, page_bufs, 0, |
1601 | PAGE_CACHE_SIZE, NULL, bget_one); | |
1602 | ||
1603 | ret = block_write_full_page(page, ext3_get_block, wbc); | |
1604 | ||
1605 | /* | |
1606 | * The page can become unlocked at any point now, and | |
1607 | * truncate can then come in and change things. So we | |
1608 | * can't touch *page from now on. But *page_bufs is | |
1609 | * safe due to elevated refcount. | |
1610 | */ | |
1611 | ||
1612 | /* | |
ae6ddcc5 | 1613 | * And attach them to the current transaction. But only if |
1da177e4 LT |
1614 | * block_write_full_page() succeeded. Otherwise they are unmapped, |
1615 | * and generally junk. | |
1616 | */ | |
1617 | if (ret == 0) { | |
1618 | err = walk_page_buffers(handle, page_bufs, 0, PAGE_CACHE_SIZE, | |
1619 | NULL, journal_dirty_data_fn); | |
1620 | if (!ret) | |
1621 | ret = err; | |
1622 | } | |
1623 | walk_page_buffers(handle, page_bufs, 0, | |
1624 | PAGE_CACHE_SIZE, NULL, bput_one); | |
1625 | err = ext3_journal_stop(handle); | |
1626 | if (!ret) | |
1627 | ret = err; | |
1628 | return ret; | |
1629 | ||
1630 | out_fail: | |
1631 | redirty_page_for_writepage(wbc, page); | |
1632 | unlock_page(page); | |
1633 | return ret; | |
1634 | } | |
1635 | ||
1da177e4 LT |
1636 | static int ext3_writeback_writepage(struct page *page, |
1637 | struct writeback_control *wbc) | |
1638 | { | |
1639 | struct inode *inode = page->mapping->host; | |
1640 | handle_t *handle = NULL; | |
1641 | int ret = 0; | |
1642 | int err; | |
1643 | ||
49792c80 DM |
1644 | J_ASSERT(PageLocked(page)); |
1645 | WARN_ON_ONCE(IS_RDONLY(inode)); | |
1646 | ||
1da177e4 LT |
1647 | if (ext3_journal_current_handle()) |
1648 | goto out_fail; | |
1649 | ||
430db323 JK |
1650 | if (page_has_buffers(page)) { |
1651 | if (!walk_page_buffers(NULL, page_buffers(page), 0, | |
1652 | PAGE_CACHE_SIZE, NULL, buffer_unmapped)) { | |
1653 | /* Provide NULL get_block() to catch bugs if buffers | |
1654 | * weren't really mapped */ | |
1655 | return block_write_full_page(page, NULL, wbc); | |
1656 | } | |
1657 | } | |
1658 | ||
1da177e4 LT |
1659 | handle = ext3_journal_start(inode, ext3_writepage_trans_blocks(inode)); |
1660 | if (IS_ERR(handle)) { | |
1661 | ret = PTR_ERR(handle); | |
1662 | goto out_fail; | |
1663 | } | |
1664 | ||
4c4d3901 | 1665 | ret = block_write_full_page(page, ext3_get_block, wbc); |
1da177e4 LT |
1666 | |
1667 | err = ext3_journal_stop(handle); | |
1668 | if (!ret) | |
1669 | ret = err; | |
1670 | return ret; | |
1671 | ||
1672 | out_fail: | |
1673 | redirty_page_for_writepage(wbc, page); | |
1674 | unlock_page(page); | |
1675 | return ret; | |
1676 | } | |
1677 | ||
1678 | static int ext3_journalled_writepage(struct page *page, | |
1679 | struct writeback_control *wbc) | |
1680 | { | |
1681 | struct inode *inode = page->mapping->host; | |
1682 | handle_t *handle = NULL; | |
1683 | int ret = 0; | |
1684 | int err; | |
1685 | ||
49792c80 DM |
1686 | J_ASSERT(PageLocked(page)); |
1687 | WARN_ON_ONCE(IS_RDONLY(inode)); | |
1688 | ||
1da177e4 LT |
1689 | if (ext3_journal_current_handle()) |
1690 | goto no_write; | |
1691 | ||
1692 | handle = ext3_journal_start(inode, ext3_writepage_trans_blocks(inode)); | |
1693 | if (IS_ERR(handle)) { | |
1694 | ret = PTR_ERR(handle); | |
1695 | goto no_write; | |
1696 | } | |
1697 | ||
1698 | if (!page_has_buffers(page) || PageChecked(page)) { | |
1699 | /* | |
1700 | * It's mmapped pagecache. Add buffers and journal it. There | |
1701 | * doesn't seem much point in redirtying the page here. | |
1702 | */ | |
1703 | ClearPageChecked(page); | |
ebdec241 CH |
1704 | ret = __block_write_begin(page, 0, PAGE_CACHE_SIZE, |
1705 | ext3_get_block); | |
ab4eb43c DL |
1706 | if (ret != 0) { |
1707 | ext3_journal_stop(handle); | |
1da177e4 | 1708 | goto out_unlock; |
ab4eb43c | 1709 | } |
1da177e4 LT |
1710 | ret = walk_page_buffers(handle, page_buffers(page), 0, |
1711 | PAGE_CACHE_SIZE, NULL, do_journal_get_write_access); | |
1712 | ||
1713 | err = walk_page_buffers(handle, page_buffers(page), 0, | |
f4fc66a8 | 1714 | PAGE_CACHE_SIZE, NULL, write_end_fn); |
1da177e4 LT |
1715 | if (ret == 0) |
1716 | ret = err; | |
9df93939 | 1717 | ext3_set_inode_state(inode, EXT3_STATE_JDATA); |
1da177e4 LT |
1718 | unlock_page(page); |
1719 | } else { | |
1720 | /* | |
1721 | * It may be a page full of checkpoint-mode buffers. We don't | |
1722 | * really know unless we go poke around in the buffer_heads. | |
1723 | * But block_write_full_page will do the right thing. | |
1724 | */ | |
1725 | ret = block_write_full_page(page, ext3_get_block, wbc); | |
1726 | } | |
1727 | err = ext3_journal_stop(handle); | |
1728 | if (!ret) | |
1729 | ret = err; | |
1730 | out: | |
1731 | return ret; | |
1732 | ||
1733 | no_write: | |
1734 | redirty_page_for_writepage(wbc, page); | |
1735 | out_unlock: | |
1736 | unlock_page(page); | |
1737 | goto out; | |
1738 | } | |
1739 | ||
1740 | static int ext3_readpage(struct file *file, struct page *page) | |
1741 | { | |
1742 | return mpage_readpage(page, ext3_get_block); | |
1743 | } | |
1744 | ||
1745 | static int | |
1746 | ext3_readpages(struct file *file, struct address_space *mapping, | |
1747 | struct list_head *pages, unsigned nr_pages) | |
1748 | { | |
1749 | return mpage_readpages(mapping, pages, nr_pages, ext3_get_block); | |
1750 | } | |
1751 | ||
2ff28e22 | 1752 | static void ext3_invalidatepage(struct page *page, unsigned long offset) |
1da177e4 LT |
1753 | { |
1754 | journal_t *journal = EXT3_JOURNAL(page->mapping->host); | |
1755 | ||
1756 | /* | |
1757 | * If it's a full truncate we just forget about the pending dirtying | |
1758 | */ | |
1759 | if (offset == 0) | |
1760 | ClearPageChecked(page); | |
1761 | ||
2ff28e22 | 1762 | journal_invalidatepage(journal, page, offset); |
1da177e4 LT |
1763 | } |
1764 | ||
27496a8c | 1765 | static int ext3_releasepage(struct page *page, gfp_t wait) |
1da177e4 LT |
1766 | { |
1767 | journal_t *journal = EXT3_JOURNAL(page->mapping->host); | |
1768 | ||
1769 | WARN_ON(PageChecked(page)); | |
1770 | if (!page_has_buffers(page)) | |
1771 | return 0; | |
1772 | return journal_try_to_free_buffers(journal, page, wait); | |
1773 | } | |
1774 | ||
1775 | /* | |
1776 | * If the O_DIRECT write will extend the file then add this inode to the | |
1777 | * orphan list. So recovery will truncate it back to the original size | |
1778 | * if the machine crashes during the write. | |
1779 | * | |
1780 | * If the O_DIRECT write is intantiating holes inside i_size and the machine | |
bd1939de JK |
1781 | * crashes then stale disk data _may_ be exposed inside the file. But current |
1782 | * VFS code falls back into buffered path in that case so we are safe. | |
1da177e4 LT |
1783 | */ |
1784 | static ssize_t ext3_direct_IO(int rw, struct kiocb *iocb, | |
1785 | const struct iovec *iov, loff_t offset, | |
1786 | unsigned long nr_segs) | |
1787 | { | |
1788 | struct file *file = iocb->ki_filp; | |
1789 | struct inode *inode = file->f_mapping->host; | |
1790 | struct ext3_inode_info *ei = EXT3_I(inode); | |
bd1939de | 1791 | handle_t *handle; |
1da177e4 LT |
1792 | ssize_t ret; |
1793 | int orphan = 0; | |
1794 | size_t count = iov_length(iov, nr_segs); | |
ea0174a7 | 1795 | int retries = 0; |
1da177e4 LT |
1796 | |
1797 | if (rw == WRITE) { | |
1798 | loff_t final_size = offset + count; | |
1799 | ||
1da177e4 | 1800 | if (final_size > inode->i_size) { |
bd1939de JK |
1801 | /* Credits for sb + inode write */ |
1802 | handle = ext3_journal_start(inode, 2); | |
1803 | if (IS_ERR(handle)) { | |
1804 | ret = PTR_ERR(handle); | |
1805 | goto out; | |
1806 | } | |
1da177e4 | 1807 | ret = ext3_orphan_add(handle, inode); |
bd1939de JK |
1808 | if (ret) { |
1809 | ext3_journal_stop(handle); | |
1810 | goto out; | |
1811 | } | |
1da177e4 LT |
1812 | orphan = 1; |
1813 | ei->i_disksize = inode->i_size; | |
bd1939de | 1814 | ext3_journal_stop(handle); |
1da177e4 LT |
1815 | } |
1816 | } | |
1817 | ||
ea0174a7 | 1818 | retry: |
ae6ddcc5 | 1819 | ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, |
1da177e4 | 1820 | offset, nr_segs, |
f91a2ad2 | 1821 | ext3_get_block, NULL); |
eafdc7d1 CH |
1822 | /* |
1823 | * In case of error extending write may have instantiated a few | |
1824 | * blocks outside i_size. Trim these off again. | |
1825 | */ | |
1826 | if (unlikely((rw & WRITE) && ret < 0)) { | |
1827 | loff_t isize = i_size_read(inode); | |
1828 | loff_t end = offset + iov_length(iov, nr_segs); | |
1829 | ||
1830 | if (end > isize) | |
1831 | vmtruncate(inode, isize); | |
1832 | } | |
ea0174a7 ES |
1833 | if (ret == -ENOSPC && ext3_should_retry_alloc(inode->i_sb, &retries)) |
1834 | goto retry; | |
1da177e4 | 1835 | |
bd1939de | 1836 | if (orphan) { |
1da177e4 LT |
1837 | int err; |
1838 | ||
bd1939de JK |
1839 | /* Credits for sb + inode write */ |
1840 | handle = ext3_journal_start(inode, 2); | |
1841 | if (IS_ERR(handle)) { | |
1842 | /* This is really bad luck. We've written the data | |
7eb4969e JK |
1843 | * but cannot extend i_size. Truncate allocated blocks |
1844 | * and pretend the write failed... */ | |
1845 | ext3_truncate(inode); | |
bd1939de JK |
1846 | ret = PTR_ERR(handle); |
1847 | goto out; | |
1848 | } | |
1849 | if (inode->i_nlink) | |
1da177e4 | 1850 | ext3_orphan_del(handle, inode); |
bd1939de | 1851 | if (ret > 0) { |
1da177e4 LT |
1852 | loff_t end = offset + ret; |
1853 | if (end > inode->i_size) { | |
1854 | ei->i_disksize = end; | |
1855 | i_size_write(inode, end); | |
1856 | /* | |
1857 | * We're going to return a positive `ret' | |
1858 | * here due to non-zero-length I/O, so there's | |
1859 | * no way of reporting error returns from | |
1860 | * ext3_mark_inode_dirty() to userspace. So | |
1861 | * ignore it. | |
1862 | */ | |
1863 | ext3_mark_inode_dirty(handle, inode); | |
1864 | } | |
1865 | } | |
1866 | err = ext3_journal_stop(handle); | |
1867 | if (ret == 0) | |
1868 | ret = err; | |
1869 | } | |
1870 | out: | |
1871 | return ret; | |
1872 | } | |
1873 | ||
1874 | /* | |
1875 | * Pages can be marked dirty completely asynchronously from ext3's journalling | |
1876 | * activity. By filemap_sync_pte(), try_to_unmap_one(), etc. We cannot do | |
1877 | * much here because ->set_page_dirty is called under VFS locks. The page is | |
1878 | * not necessarily locked. | |
1879 | * | |
1880 | * We cannot just dirty the page and leave attached buffers clean, because the | |
1881 | * buffers' dirty state is "definitive". We cannot just set the buffers dirty | |
1882 | * or jbddirty because all the journalling code will explode. | |
1883 | * | |
1884 | * So what we do is to mark the page "pending dirty" and next time writepage | |
1885 | * is called, propagate that into the buffers appropriately. | |
1886 | */ | |
1887 | static int ext3_journalled_set_page_dirty(struct page *page) | |
1888 | { | |
1889 | SetPageChecked(page); | |
1890 | return __set_page_dirty_nobuffers(page); | |
1891 | } | |
1892 | ||
f5e54d6e | 1893 | static const struct address_space_operations ext3_ordered_aops = { |
8ab22b9a HH |
1894 | .readpage = ext3_readpage, |
1895 | .readpages = ext3_readpages, | |
1896 | .writepage = ext3_ordered_writepage, | |
1897 | .sync_page = block_sync_page, | |
1898 | .write_begin = ext3_write_begin, | |
1899 | .write_end = ext3_ordered_write_end, | |
1900 | .bmap = ext3_bmap, | |
1901 | .invalidatepage = ext3_invalidatepage, | |
1902 | .releasepage = ext3_releasepage, | |
1903 | .direct_IO = ext3_direct_IO, | |
1904 | .migratepage = buffer_migrate_page, | |
1905 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 1906 | .error_remove_page = generic_error_remove_page, |
1da177e4 LT |
1907 | }; |
1908 | ||
f5e54d6e | 1909 | static const struct address_space_operations ext3_writeback_aops = { |
8ab22b9a HH |
1910 | .readpage = ext3_readpage, |
1911 | .readpages = ext3_readpages, | |
1912 | .writepage = ext3_writeback_writepage, | |
1913 | .sync_page = block_sync_page, | |
1914 | .write_begin = ext3_write_begin, | |
1915 | .write_end = ext3_writeback_write_end, | |
1916 | .bmap = ext3_bmap, | |
1917 | .invalidatepage = ext3_invalidatepage, | |
1918 | .releasepage = ext3_releasepage, | |
1919 | .direct_IO = ext3_direct_IO, | |
1920 | .migratepage = buffer_migrate_page, | |
1921 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 1922 | .error_remove_page = generic_error_remove_page, |
1da177e4 LT |
1923 | }; |
1924 | ||
f5e54d6e | 1925 | static const struct address_space_operations ext3_journalled_aops = { |
8ab22b9a HH |
1926 | .readpage = ext3_readpage, |
1927 | .readpages = ext3_readpages, | |
1928 | .writepage = ext3_journalled_writepage, | |
1929 | .sync_page = block_sync_page, | |
1930 | .write_begin = ext3_write_begin, | |
1931 | .write_end = ext3_journalled_write_end, | |
1932 | .set_page_dirty = ext3_journalled_set_page_dirty, | |
1933 | .bmap = ext3_bmap, | |
1934 | .invalidatepage = ext3_invalidatepage, | |
1935 | .releasepage = ext3_releasepage, | |
1936 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 1937 | .error_remove_page = generic_error_remove_page, |
1da177e4 LT |
1938 | }; |
1939 | ||
1940 | void ext3_set_aops(struct inode *inode) | |
1941 | { | |
1942 | if (ext3_should_order_data(inode)) | |
1943 | inode->i_mapping->a_ops = &ext3_ordered_aops; | |
1944 | else if (ext3_should_writeback_data(inode)) | |
1945 | inode->i_mapping->a_ops = &ext3_writeback_aops; | |
1946 | else | |
1947 | inode->i_mapping->a_ops = &ext3_journalled_aops; | |
1948 | } | |
1949 | ||
1950 | /* | |
1951 | * ext3_block_truncate_page() zeroes out a mapping from file offset `from' | |
1952 | * up to the end of the block which corresponds to `from'. | |
1953 | * This required during truncate. We need to physically zero the tail end | |
1954 | * of that block so it doesn't yield old data if the file is later grown. | |
1955 | */ | |
1956 | static int ext3_block_truncate_page(handle_t *handle, struct page *page, | |
1957 | struct address_space *mapping, loff_t from) | |
1958 | { | |
43d23f90 | 1959 | ext3_fsblk_t index = from >> PAGE_CACHE_SHIFT; |
1da177e4 LT |
1960 | unsigned offset = from & (PAGE_CACHE_SIZE-1); |
1961 | unsigned blocksize, iblock, length, pos; | |
1962 | struct inode *inode = mapping->host; | |
1963 | struct buffer_head *bh; | |
1964 | int err = 0; | |
1da177e4 LT |
1965 | |
1966 | blocksize = inode->i_sb->s_blocksize; | |
1967 | length = blocksize - (offset & (blocksize - 1)); | |
1968 | iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); | |
1969 | ||
1da177e4 LT |
1970 | if (!page_has_buffers(page)) |
1971 | create_empty_buffers(page, blocksize, 0); | |
1972 | ||
1973 | /* Find the buffer that contains "offset" */ | |
1974 | bh = page_buffers(page); | |
1975 | pos = blocksize; | |
1976 | while (offset >= pos) { | |
1977 | bh = bh->b_this_page; | |
1978 | iblock++; | |
1979 | pos += blocksize; | |
1980 | } | |
1981 | ||
1982 | err = 0; | |
1983 | if (buffer_freed(bh)) { | |
1984 | BUFFER_TRACE(bh, "freed: skip"); | |
1985 | goto unlock; | |
1986 | } | |
1987 | ||
1988 | if (!buffer_mapped(bh)) { | |
1989 | BUFFER_TRACE(bh, "unmapped"); | |
1990 | ext3_get_block(inode, iblock, bh, 0); | |
1991 | /* unmapped? It's a hole - nothing to do */ | |
1992 | if (!buffer_mapped(bh)) { | |
1993 | BUFFER_TRACE(bh, "still unmapped"); | |
1994 | goto unlock; | |
1995 | } | |
1996 | } | |
1997 | ||
1998 | /* Ok, it's mapped. Make sure it's up-to-date */ | |
1999 | if (PageUptodate(page)) | |
2000 | set_buffer_uptodate(bh); | |
2001 | ||
2002 | if (!buffer_uptodate(bh)) { | |
2003 | err = -EIO; | |
2004 | ll_rw_block(READ, 1, &bh); | |
2005 | wait_on_buffer(bh); | |
2006 | /* Uhhuh. Read error. Complain and punt. */ | |
2007 | if (!buffer_uptodate(bh)) | |
2008 | goto unlock; | |
2009 | } | |
2010 | ||
2011 | if (ext3_should_journal_data(inode)) { | |
2012 | BUFFER_TRACE(bh, "get write access"); | |
2013 | err = ext3_journal_get_write_access(handle, bh); | |
2014 | if (err) | |
2015 | goto unlock; | |
2016 | } | |
2017 | ||
eebd2aa3 | 2018 | zero_user(page, offset, length); |
1da177e4 LT |
2019 | BUFFER_TRACE(bh, "zeroed end of block"); |
2020 | ||
2021 | err = 0; | |
2022 | if (ext3_should_journal_data(inode)) { | |
2023 | err = ext3_journal_dirty_metadata(handle, bh); | |
2024 | } else { | |
2025 | if (ext3_should_order_data(inode)) | |
2026 | err = ext3_journal_dirty_data(handle, bh); | |
2027 | mark_buffer_dirty(bh); | |
2028 | } | |
2029 | ||
2030 | unlock: | |
2031 | unlock_page(page); | |
2032 | page_cache_release(page); | |
2033 | return err; | |
2034 | } | |
2035 | ||
2036 | /* | |
2037 | * Probably it should be a library function... search for first non-zero word | |
2038 | * or memcmp with zero_page, whatever is better for particular architecture. | |
2039 | * Linus? | |
2040 | */ | |
2041 | static inline int all_zeroes(__le32 *p, __le32 *q) | |
2042 | { | |
2043 | while (p < q) | |
2044 | if (*p++) | |
2045 | return 0; | |
2046 | return 1; | |
2047 | } | |
2048 | ||
2049 | /** | |
2050 | * ext3_find_shared - find the indirect blocks for partial truncation. | |
2051 | * @inode: inode in question | |
2052 | * @depth: depth of the affected branch | |
2053 | * @offsets: offsets of pointers in that branch (see ext3_block_to_path) | |
2054 | * @chain: place to store the pointers to partial indirect blocks | |
2055 | * @top: place to the (detached) top of branch | |
2056 | * | |
2057 | * This is a helper function used by ext3_truncate(). | |
2058 | * | |
2059 | * When we do truncate() we may have to clean the ends of several | |
2060 | * indirect blocks but leave the blocks themselves alive. Block is | |
2061 | * partially truncated if some data below the new i_size is refered | |
2062 | * from it (and it is on the path to the first completely truncated | |
2063 | * data block, indeed). We have to free the top of that path along | |
2064 | * with everything to the right of the path. Since no allocation | |
2065 | * past the truncation point is possible until ext3_truncate() | |
2066 | * finishes, we may safely do the latter, but top of branch may | |
2067 | * require special attention - pageout below the truncation point | |
2068 | * might try to populate it. | |
2069 | * | |
2070 | * We atomically detach the top of branch from the tree, store the | |
2071 | * block number of its root in *@top, pointers to buffer_heads of | |
2072 | * partially truncated blocks - in @chain[].bh and pointers to | |
2073 | * their last elements that should not be removed - in | |
2074 | * @chain[].p. Return value is the pointer to last filled element | |
2075 | * of @chain. | |
2076 | * | |
2077 | * The work left to caller to do the actual freeing of subtrees: | |
2078 | * a) free the subtree starting from *@top | |
2079 | * b) free the subtrees whose roots are stored in | |
2080 | * (@chain[i].p+1 .. end of @chain[i].bh->b_data) | |
2081 | * c) free the subtrees growing from the inode past the @chain[0]. | |
2082 | * (no partially truncated stuff there). */ | |
2083 | ||
d6859bfc AM |
2084 | static Indirect *ext3_find_shared(struct inode *inode, int depth, |
2085 | int offsets[4], Indirect chain[4], __le32 *top) | |
1da177e4 LT |
2086 | { |
2087 | Indirect *partial, *p; | |
2088 | int k, err; | |
2089 | ||
2090 | *top = 0; | |
bf48aabb | 2091 | /* Make k index the deepest non-null offset + 1 */ |
1da177e4 LT |
2092 | for (k = depth; k > 1 && !offsets[k-1]; k--) |
2093 | ; | |
2094 | partial = ext3_get_branch(inode, k, offsets, chain, &err); | |
2095 | /* Writer: pointers */ | |
2096 | if (!partial) | |
2097 | partial = chain + k-1; | |
2098 | /* | |
2099 | * If the branch acquired continuation since we've looked at it - | |
2100 | * fine, it should all survive and (new) top doesn't belong to us. | |
2101 | */ | |
2102 | if (!partial->key && *partial->p) | |
2103 | /* Writer: end */ | |
2104 | goto no_top; | |
2105 | for (p=partial; p>chain && all_zeroes((__le32*)p->bh->b_data,p->p); p--) | |
2106 | ; | |
2107 | /* | |
2108 | * OK, we've found the last block that must survive. The rest of our | |
2109 | * branch should be detached before unlocking. However, if that rest | |
2110 | * of branch is all ours and does not grow immediately from the inode | |
2111 | * it's easier to cheat and just decrement partial->p. | |
2112 | */ | |
2113 | if (p == chain + k - 1 && p > chain) { | |
2114 | p->p--; | |
2115 | } else { | |
2116 | *top = *p->p; | |
2117 | /* Nope, don't do this in ext3. Must leave the tree intact */ | |
2118 | #if 0 | |
2119 | *p->p = 0; | |
2120 | #endif | |
2121 | } | |
2122 | /* Writer: end */ | |
2123 | ||
d6859bfc | 2124 | while(partial > p) { |
1da177e4 LT |
2125 | brelse(partial->bh); |
2126 | partial--; | |
2127 | } | |
2128 | no_top: | |
2129 | return partial; | |
2130 | } | |
2131 | ||
2132 | /* | |
2133 | * Zero a number of block pointers in either an inode or an indirect block. | |
2134 | * If we restart the transaction we must again get write access to the | |
2135 | * indirect block for further modification. | |
2136 | * | |
2137 | * We release `count' blocks on disk, but (last - first) may be greater | |
2138 | * than `count' because there can be holes in there. | |
2139 | */ | |
d6859bfc | 2140 | static void ext3_clear_blocks(handle_t *handle, struct inode *inode, |
43d23f90 | 2141 | struct buffer_head *bh, ext3_fsblk_t block_to_free, |
d6859bfc | 2142 | unsigned long count, __le32 *first, __le32 *last) |
1da177e4 LT |
2143 | { |
2144 | __le32 *p; | |
2145 | if (try_to_extend_transaction(handle, inode)) { | |
2146 | if (bh) { | |
2147 | BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata"); | |
2148 | ext3_journal_dirty_metadata(handle, bh); | |
2149 | } | |
2150 | ext3_mark_inode_dirty(handle, inode); | |
00171d3c | 2151 | truncate_restart_transaction(handle, inode); |
1da177e4 LT |
2152 | if (bh) { |
2153 | BUFFER_TRACE(bh, "retaking write access"); | |
2154 | ext3_journal_get_write_access(handle, bh); | |
2155 | } | |
2156 | } | |
2157 | ||
2158 | /* | |
2159 | * Any buffers which are on the journal will be in memory. We find | |
2160 | * them on the hash table so journal_revoke() will run journal_forget() | |
2161 | * on them. We've already detached each block from the file, so | |
2162 | * bforget() in journal_forget() should be safe. | |
2163 | * | |
2164 | * AKPM: turn on bforget in journal_forget()!!! | |
2165 | */ | |
2166 | for (p = first; p < last; p++) { | |
2167 | u32 nr = le32_to_cpu(*p); | |
2168 | if (nr) { | |
2169 | struct buffer_head *bh; | |
2170 | ||
2171 | *p = 0; | |
2172 | bh = sb_find_get_block(inode->i_sb, nr); | |
2173 | ext3_forget(handle, 0, inode, bh, nr); | |
2174 | } | |
2175 | } | |
2176 | ||
2177 | ext3_free_blocks(handle, inode, block_to_free, count); | |
2178 | } | |
2179 | ||
2180 | /** | |
2181 | * ext3_free_data - free a list of data blocks | |
2182 | * @handle: handle for this transaction | |
2183 | * @inode: inode we are dealing with | |
2184 | * @this_bh: indirect buffer_head which contains *@first and *@last | |
2185 | * @first: array of block numbers | |
2186 | * @last: points immediately past the end of array | |
2187 | * | |
2188 | * We are freeing all blocks refered from that array (numbers are stored as | |
2189 | * little-endian 32-bit) and updating @inode->i_blocks appropriately. | |
2190 | * | |
2191 | * We accumulate contiguous runs of blocks to free. Conveniently, if these | |
2192 | * blocks are contiguous then releasing them at one time will only affect one | |
2193 | * or two bitmap blocks (+ group descriptor(s) and superblock) and we won't | |
2194 | * actually use a lot of journal space. | |
2195 | * | |
2196 | * @this_bh will be %NULL if @first and @last point into the inode's direct | |
2197 | * block pointers. | |
2198 | */ | |
2199 | static void ext3_free_data(handle_t *handle, struct inode *inode, | |
2200 | struct buffer_head *this_bh, | |
2201 | __le32 *first, __le32 *last) | |
2202 | { | |
43d23f90 | 2203 | ext3_fsblk_t block_to_free = 0; /* Starting block # of a run */ |
ae6ddcc5 | 2204 | unsigned long count = 0; /* Number of blocks in the run */ |
1da177e4 LT |
2205 | __le32 *block_to_free_p = NULL; /* Pointer into inode/ind |
2206 | corresponding to | |
2207 | block_to_free */ | |
43d23f90 | 2208 | ext3_fsblk_t nr; /* Current block # */ |
1da177e4 LT |
2209 | __le32 *p; /* Pointer into inode/ind |
2210 | for current block */ | |
2211 | int err; | |
2212 | ||
2213 | if (this_bh) { /* For indirect block */ | |
2214 | BUFFER_TRACE(this_bh, "get_write_access"); | |
2215 | err = ext3_journal_get_write_access(handle, this_bh); | |
2216 | /* Important: if we can't update the indirect pointers | |
2217 | * to the blocks, we can't free them. */ | |
2218 | if (err) | |
2219 | return; | |
2220 | } | |
2221 | ||
2222 | for (p = first; p < last; p++) { | |
2223 | nr = le32_to_cpu(*p); | |
2224 | if (nr) { | |
2225 | /* accumulate blocks to free if they're contiguous */ | |
2226 | if (count == 0) { | |
2227 | block_to_free = nr; | |
2228 | block_to_free_p = p; | |
2229 | count = 1; | |
2230 | } else if (nr == block_to_free + count) { | |
2231 | count++; | |
2232 | } else { | |
ae6ddcc5 | 2233 | ext3_clear_blocks(handle, inode, this_bh, |
1da177e4 LT |
2234 | block_to_free, |
2235 | count, block_to_free_p, p); | |
2236 | block_to_free = nr; | |
2237 | block_to_free_p = p; | |
2238 | count = 1; | |
2239 | } | |
2240 | } | |
2241 | } | |
2242 | ||
2243 | if (count > 0) | |
2244 | ext3_clear_blocks(handle, inode, this_bh, block_to_free, | |
2245 | count, block_to_free_p, p); | |
2246 | ||
2247 | if (this_bh) { | |
2248 | BUFFER_TRACE(this_bh, "call ext3_journal_dirty_metadata"); | |
3ccc3167 DG |
2249 | |
2250 | /* | |
2251 | * The buffer head should have an attached journal head at this | |
2252 | * point. However, if the data is corrupted and an indirect | |
2253 | * block pointed to itself, it would have been detached when | |
2254 | * the block was cleared. Check for this instead of OOPSing. | |
2255 | */ | |
2256 | if (bh2jh(this_bh)) | |
2257 | ext3_journal_dirty_metadata(handle, this_bh); | |
2258 | else | |
2259 | ext3_error(inode->i_sb, "ext3_free_data", | |
2260 | "circular indirect block detected, " | |
2261 | "inode=%lu, block=%llu", | |
2262 | inode->i_ino, | |
2263 | (unsigned long long)this_bh->b_blocknr); | |
1da177e4 LT |
2264 | } |
2265 | } | |
2266 | ||
2267 | /** | |
2268 | * ext3_free_branches - free an array of branches | |
2269 | * @handle: JBD handle for this transaction | |
2270 | * @inode: inode we are dealing with | |
2271 | * @parent_bh: the buffer_head which contains *@first and *@last | |
2272 | * @first: array of block numbers | |
2273 | * @last: pointer immediately past the end of array | |
2274 | * @depth: depth of the branches to free | |
2275 | * | |
2276 | * We are freeing all blocks refered from these branches (numbers are | |
2277 | * stored as little-endian 32-bit) and updating @inode->i_blocks | |
2278 | * appropriately. | |
2279 | */ | |
2280 | static void ext3_free_branches(handle_t *handle, struct inode *inode, | |
2281 | struct buffer_head *parent_bh, | |
2282 | __le32 *first, __le32 *last, int depth) | |
2283 | { | |
43d23f90 | 2284 | ext3_fsblk_t nr; |
1da177e4 LT |
2285 | __le32 *p; |
2286 | ||
2287 | if (is_handle_aborted(handle)) | |
2288 | return; | |
2289 | ||
2290 | if (depth--) { | |
2291 | struct buffer_head *bh; | |
2292 | int addr_per_block = EXT3_ADDR_PER_BLOCK(inode->i_sb); | |
2293 | p = last; | |
2294 | while (--p >= first) { | |
2295 | nr = le32_to_cpu(*p); | |
2296 | if (!nr) | |
2297 | continue; /* A hole */ | |
2298 | ||
2299 | /* Go read the buffer for the next level down */ | |
2300 | bh = sb_bread(inode->i_sb, nr); | |
2301 | ||
2302 | /* | |
2303 | * A read failure? Report error and clear slot | |
2304 | * (should be rare). | |
2305 | */ | |
2306 | if (!bh) { | |
2307 | ext3_error(inode->i_sb, "ext3_free_branches", | |
eee194e7 | 2308 | "Read failure, inode=%lu, block="E3FSBLK, |
1da177e4 LT |
2309 | inode->i_ino, nr); |
2310 | continue; | |
2311 | } | |
2312 | ||
2313 | /* This zaps the entire block. Bottom up. */ | |
2314 | BUFFER_TRACE(bh, "free child branches"); | |
2315 | ext3_free_branches(handle, inode, bh, | |
2316 | (__le32*)bh->b_data, | |
2317 | (__le32*)bh->b_data + addr_per_block, | |
2318 | depth); | |
2319 | ||
1da177e4 LT |
2320 | /* |
2321 | * Everything below this this pointer has been | |
2322 | * released. Now let this top-of-subtree go. | |
2323 | * | |
2324 | * We want the freeing of this indirect block to be | |
2325 | * atomic in the journal with the updating of the | |
2326 | * bitmap block which owns it. So make some room in | |
2327 | * the journal. | |
2328 | * | |
2329 | * We zero the parent pointer *after* freeing its | |
2330 | * pointee in the bitmaps, so if extend_transaction() | |
2331 | * for some reason fails to put the bitmap changes and | |
2332 | * the release into the same transaction, recovery | |
2333 | * will merely complain about releasing a free block, | |
2334 | * rather than leaking blocks. | |
2335 | */ | |
2336 | if (is_handle_aborted(handle)) | |
2337 | return; | |
2338 | if (try_to_extend_transaction(handle, inode)) { | |
2339 | ext3_mark_inode_dirty(handle, inode); | |
00171d3c | 2340 | truncate_restart_transaction(handle, inode); |
1da177e4 LT |
2341 | } |
2342 | ||
f25f6242 JK |
2343 | /* |
2344 | * We've probably journalled the indirect block several | |
2345 | * times during the truncate. But it's no longer | |
2346 | * needed and we now drop it from the transaction via | |
2347 | * journal_revoke(). | |
2348 | * | |
2349 | * That's easy if it's exclusively part of this | |
2350 | * transaction. But if it's part of the committing | |
2351 | * transaction then journal_forget() will simply | |
2352 | * brelse() it. That means that if the underlying | |
2353 | * block is reallocated in ext3_get_block(), | |
2354 | * unmap_underlying_metadata() will find this block | |
2355 | * and will try to get rid of it. damn, damn. Thus | |
2356 | * we don't allow a block to be reallocated until | |
2357 | * a transaction freeing it has fully committed. | |
2358 | * | |
2359 | * We also have to make sure journal replay after a | |
2360 | * crash does not overwrite non-journaled data blocks | |
2361 | * with old metadata when the block got reallocated for | |
2362 | * data. Thus we have to store a revoke record for a | |
2363 | * block in the same transaction in which we free the | |
2364 | * block. | |
2365 | */ | |
2366 | ext3_forget(handle, 1, inode, bh, bh->b_blocknr); | |
2367 | ||
1da177e4 LT |
2368 | ext3_free_blocks(handle, inode, nr, 1); |
2369 | ||
2370 | if (parent_bh) { | |
2371 | /* | |
2372 | * The block which we have just freed is | |
2373 | * pointed to by an indirect block: journal it | |
2374 | */ | |
2375 | BUFFER_TRACE(parent_bh, "get_write_access"); | |
2376 | if (!ext3_journal_get_write_access(handle, | |
2377 | parent_bh)){ | |
2378 | *p = 0; | |
2379 | BUFFER_TRACE(parent_bh, | |
2380 | "call ext3_journal_dirty_metadata"); | |
ae6ddcc5 | 2381 | ext3_journal_dirty_metadata(handle, |
1da177e4 LT |
2382 | parent_bh); |
2383 | } | |
2384 | } | |
2385 | } | |
2386 | } else { | |
2387 | /* We have reached the bottom of the tree. */ | |
2388 | BUFFER_TRACE(parent_bh, "free data blocks"); | |
2389 | ext3_free_data(handle, inode, parent_bh, first, last); | |
2390 | } | |
2391 | } | |
2392 | ||
ae76dd9a DG |
2393 | int ext3_can_truncate(struct inode *inode) |
2394 | { | |
2395 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
2396 | return 0; | |
2397 | if (S_ISREG(inode->i_mode)) | |
2398 | return 1; | |
2399 | if (S_ISDIR(inode->i_mode)) | |
2400 | return 1; | |
2401 | if (S_ISLNK(inode->i_mode)) | |
2402 | return !ext3_inode_is_fast_symlink(inode); | |
2403 | return 0; | |
2404 | } | |
2405 | ||
1da177e4 LT |
2406 | /* |
2407 | * ext3_truncate() | |
2408 | * | |
2409 | * We block out ext3_get_block() block instantiations across the entire | |
2410 | * transaction, and VFS/VM ensures that ext3_truncate() cannot run | |
2411 | * simultaneously on behalf of the same inode. | |
2412 | * | |
2413 | * As we work through the truncate and commmit bits of it to the journal there | |
2414 | * is one core, guiding principle: the file's tree must always be consistent on | |
2415 | * disk. We must be able to restart the truncate after a crash. | |
2416 | * | |
2417 | * The file's tree may be transiently inconsistent in memory (although it | |
2418 | * probably isn't), but whenever we close off and commit a journal transaction, | |
2419 | * the contents of (the filesystem + the journal) must be consistent and | |
2420 | * restartable. It's pretty simple, really: bottom up, right to left (although | |
2421 | * left-to-right works OK too). | |
2422 | * | |
2423 | * Note that at recovery time, journal replay occurs *before* the restart of | |
2424 | * truncate against the orphan inode list. | |
2425 | * | |
2426 | * The committed inode has the new, desired i_size (which is the same as | |
2427 | * i_disksize in this case). After a crash, ext3_orphan_cleanup() will see | |
2428 | * that this inode's truncate did not complete and it will again call | |
2429 | * ext3_truncate() to have another go. So there will be instantiated blocks | |
2430 | * to the right of the truncation point in a crashed ext3 filesystem. But | |
2431 | * that's fine - as long as they are linked from the inode, the post-crash | |
2432 | * ext3_truncate() run will find them and release them. | |
2433 | */ | |
d6859bfc | 2434 | void ext3_truncate(struct inode *inode) |
1da177e4 LT |
2435 | { |
2436 | handle_t *handle; | |
2437 | struct ext3_inode_info *ei = EXT3_I(inode); | |
2438 | __le32 *i_data = ei->i_data; | |
2439 | int addr_per_block = EXT3_ADDR_PER_BLOCK(inode->i_sb); | |
2440 | struct address_space *mapping = inode->i_mapping; | |
2441 | int offsets[4]; | |
2442 | Indirect chain[4]; | |
2443 | Indirect *partial; | |
2444 | __le32 nr = 0; | |
2445 | int n; | |
2446 | long last_block; | |
2447 | unsigned blocksize = inode->i_sb->s_blocksize; | |
2448 | struct page *page; | |
2449 | ||
ae76dd9a | 2450 | if (!ext3_can_truncate(inode)) |
ef43618a | 2451 | goto out_notrans; |
1da177e4 | 2452 | |
f7ab34ea | 2453 | if (inode->i_size == 0 && ext3_should_writeback_data(inode)) |
9df93939 | 2454 | ext3_set_inode_state(inode, EXT3_STATE_FLUSH_ON_CLOSE); |
f7ab34ea | 2455 | |
1da177e4 LT |
2456 | /* |
2457 | * We have to lock the EOF page here, because lock_page() nests | |
2458 | * outside journal_start(). | |
2459 | */ | |
2460 | if ((inode->i_size & (blocksize - 1)) == 0) { | |
2461 | /* Block boundary? Nothing to do */ | |
2462 | page = NULL; | |
2463 | } else { | |
2464 | page = grab_cache_page(mapping, | |
2465 | inode->i_size >> PAGE_CACHE_SHIFT); | |
2466 | if (!page) | |
ef43618a | 2467 | goto out_notrans; |
1da177e4 LT |
2468 | } |
2469 | ||
2470 | handle = start_transaction(inode); | |
2471 | if (IS_ERR(handle)) { | |
2472 | if (page) { | |
2473 | clear_highpage(page); | |
2474 | flush_dcache_page(page); | |
2475 | unlock_page(page); | |
2476 | page_cache_release(page); | |
2477 | } | |
ef43618a | 2478 | goto out_notrans; |
1da177e4 LT |
2479 | } |
2480 | ||
2481 | last_block = (inode->i_size + blocksize-1) | |
2482 | >> EXT3_BLOCK_SIZE_BITS(inode->i_sb); | |
2483 | ||
2484 | if (page) | |
2485 | ext3_block_truncate_page(handle, page, mapping, inode->i_size); | |
2486 | ||
2487 | n = ext3_block_to_path(inode, last_block, offsets, NULL); | |
2488 | if (n == 0) | |
2489 | goto out_stop; /* error */ | |
2490 | ||
2491 | /* | |
2492 | * OK. This truncate is going to happen. We add the inode to the | |
2493 | * orphan list, so that if this truncate spans multiple transactions, | |
2494 | * and we crash, we will resume the truncate when the filesystem | |
2495 | * recovers. It also marks the inode dirty, to catch the new size. | |
2496 | * | |
2497 | * Implication: the file must always be in a sane, consistent | |
2498 | * truncatable state while each transaction commits. | |
2499 | */ | |
2500 | if (ext3_orphan_add(handle, inode)) | |
2501 | goto out_stop; | |
2502 | ||
2503 | /* | |
2504 | * The orphan list entry will now protect us from any crash which | |
2505 | * occurs before the truncate completes, so it is now safe to propagate | |
2506 | * the new, shorter inode size (held for now in i_size) into the | |
2507 | * on-disk inode. We do this via i_disksize, which is the value which | |
2508 | * ext3 *really* writes onto the disk inode. | |
2509 | */ | |
2510 | ei->i_disksize = inode->i_size; | |
2511 | ||
2512 | /* | |
2513 | * From here we block out all ext3_get_block() callers who want to | |
2514 | * modify the block allocation tree. | |
2515 | */ | |
97461518 | 2516 | mutex_lock(&ei->truncate_mutex); |
1da177e4 LT |
2517 | |
2518 | if (n == 1) { /* direct blocks */ | |
2519 | ext3_free_data(handle, inode, NULL, i_data+offsets[0], | |
2520 | i_data + EXT3_NDIR_BLOCKS); | |
2521 | goto do_indirects; | |
2522 | } | |
2523 | ||
2524 | partial = ext3_find_shared(inode, n, offsets, chain, &nr); | |
2525 | /* Kill the top of shared branch (not detached) */ | |
2526 | if (nr) { | |
2527 | if (partial == chain) { | |
2528 | /* Shared branch grows from the inode */ | |
2529 | ext3_free_branches(handle, inode, NULL, | |
2530 | &nr, &nr+1, (chain+n-1) - partial); | |
2531 | *partial->p = 0; | |
2532 | /* | |
2533 | * We mark the inode dirty prior to restart, | |
2534 | * and prior to stop. No need for it here. | |
2535 | */ | |
2536 | } else { | |
2537 | /* Shared branch grows from an indirect block */ | |
1da177e4 LT |
2538 | ext3_free_branches(handle, inode, partial->bh, |
2539 | partial->p, | |
2540 | partial->p+1, (chain+n-1) - partial); | |
2541 | } | |
2542 | } | |
2543 | /* Clear the ends of indirect blocks on the shared branch */ | |
2544 | while (partial > chain) { | |
2545 | ext3_free_branches(handle, inode, partial->bh, partial->p + 1, | |
2546 | (__le32*)partial->bh->b_data+addr_per_block, | |
2547 | (chain+n-1) - partial); | |
2548 | BUFFER_TRACE(partial->bh, "call brelse"); | |
2549 | brelse (partial->bh); | |
2550 | partial--; | |
2551 | } | |
2552 | do_indirects: | |
2553 | /* Kill the remaining (whole) subtrees */ | |
2554 | switch (offsets[0]) { | |
d6859bfc AM |
2555 | default: |
2556 | nr = i_data[EXT3_IND_BLOCK]; | |
2557 | if (nr) { | |
2558 | ext3_free_branches(handle, inode, NULL, &nr, &nr+1, 1); | |
2559 | i_data[EXT3_IND_BLOCK] = 0; | |
2560 | } | |
2561 | case EXT3_IND_BLOCK: | |
2562 | nr = i_data[EXT3_DIND_BLOCK]; | |
2563 | if (nr) { | |
2564 | ext3_free_branches(handle, inode, NULL, &nr, &nr+1, 2); | |
2565 | i_data[EXT3_DIND_BLOCK] = 0; | |
2566 | } | |
2567 | case EXT3_DIND_BLOCK: | |
2568 | nr = i_data[EXT3_TIND_BLOCK]; | |
2569 | if (nr) { | |
2570 | ext3_free_branches(handle, inode, NULL, &nr, &nr+1, 3); | |
2571 | i_data[EXT3_TIND_BLOCK] = 0; | |
2572 | } | |
2573 | case EXT3_TIND_BLOCK: | |
2574 | ; | |
1da177e4 LT |
2575 | } |
2576 | ||
2577 | ext3_discard_reservation(inode); | |
2578 | ||
97461518 | 2579 | mutex_unlock(&ei->truncate_mutex); |
1da177e4 LT |
2580 | inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; |
2581 | ext3_mark_inode_dirty(handle, inode); | |
2582 | ||
d6859bfc AM |
2583 | /* |
2584 | * In a multi-transaction truncate, we only make the final transaction | |
2585 | * synchronous | |
2586 | */ | |
1da177e4 LT |
2587 | if (IS_SYNC(inode)) |
2588 | handle->h_sync = 1; | |
2589 | out_stop: | |
2590 | /* | |
2591 | * If this was a simple ftruncate(), and the file will remain alive | |
2592 | * then we need to clear up the orphan record which we created above. | |
2593 | * However, if this was a real unlink then we were called by | |
ac14a95b | 2594 | * ext3_evict_inode(), and we allow that function to clean up the |
1da177e4 LT |
2595 | * orphan info for us. |
2596 | */ | |
2597 | if (inode->i_nlink) | |
2598 | ext3_orphan_del(handle, inode); | |
2599 | ||
2600 | ext3_journal_stop(handle); | |
ef43618a JK |
2601 | return; |
2602 | out_notrans: | |
2603 | /* | |
2604 | * Delete the inode from orphan list so that it doesn't stay there | |
2605 | * forever and trigger assertion on umount. | |
2606 | */ | |
2607 | if (inode->i_nlink) | |
2608 | ext3_orphan_del(NULL, inode); | |
1da177e4 LT |
2609 | } |
2610 | ||
43d23f90 | 2611 | static ext3_fsblk_t ext3_get_inode_block(struct super_block *sb, |
1da177e4 LT |
2612 | unsigned long ino, struct ext3_iloc *iloc) |
2613 | { | |
e0e369a7 | 2614 | unsigned long block_group; |
43d23f90 MC |
2615 | unsigned long offset; |
2616 | ext3_fsblk_t block; | |
e0e369a7 | 2617 | struct ext3_group_desc *gdp; |
1da177e4 | 2618 | |
2ccb48eb NB |
2619 | if (!ext3_valid_inum(sb, ino)) { |
2620 | /* | |
2621 | * This error is already checked for in namei.c unless we are | |
2622 | * looking at an NFS filehandle, in which case no error | |
2623 | * report is needed | |
2624 | */ | |
1da177e4 LT |
2625 | return 0; |
2626 | } | |
2ccb48eb | 2627 | |
1da177e4 | 2628 | block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb); |
e0e369a7 AM |
2629 | gdp = ext3_get_group_desc(sb, block_group, NULL); |
2630 | if (!gdp) | |
1da177e4 | 2631 | return 0; |
1da177e4 LT |
2632 | /* |
2633 | * Figure out the offset within the block group inode table | |
2634 | */ | |
2635 | offset = ((ino - 1) % EXT3_INODES_PER_GROUP(sb)) * | |
2636 | EXT3_INODE_SIZE(sb); | |
e0e369a7 | 2637 | block = le32_to_cpu(gdp->bg_inode_table) + |
1da177e4 LT |
2638 | (offset >> EXT3_BLOCK_SIZE_BITS(sb)); |
2639 | ||
2640 | iloc->block_group = block_group; | |
2641 | iloc->offset = offset & (EXT3_BLOCK_SIZE(sb) - 1); | |
2642 | return block; | |
2643 | } | |
2644 | ||
2645 | /* | |
2646 | * ext3_get_inode_loc returns with an extra refcount against the inode's | |
2647 | * underlying buffer_head on success. If 'in_mem' is true, we have all | |
2648 | * data in memory that is needed to recreate the on-disk version of this | |
2649 | * inode. | |
2650 | */ | |
2651 | static int __ext3_get_inode_loc(struct inode *inode, | |
2652 | struct ext3_iloc *iloc, int in_mem) | |
2653 | { | |
43d23f90 | 2654 | ext3_fsblk_t block; |
1da177e4 LT |
2655 | struct buffer_head *bh; |
2656 | ||
2657 | block = ext3_get_inode_block(inode->i_sb, inode->i_ino, iloc); | |
2658 | if (!block) | |
2659 | return -EIO; | |
2660 | ||
2661 | bh = sb_getblk(inode->i_sb, block); | |
2662 | if (!bh) { | |
2663 | ext3_error (inode->i_sb, "ext3_get_inode_loc", | |
2664 | "unable to read inode block - " | |
43d23f90 MC |
2665 | "inode=%lu, block="E3FSBLK, |
2666 | inode->i_ino, block); | |
1da177e4 LT |
2667 | return -EIO; |
2668 | } | |
2669 | if (!buffer_uptodate(bh)) { | |
2670 | lock_buffer(bh); | |
95450f5a HK |
2671 | |
2672 | /* | |
2673 | * If the buffer has the write error flag, we have failed | |
2674 | * to write out another inode in the same block. In this | |
2675 | * case, we don't have to read the block because we may | |
2676 | * read the old inode data successfully. | |
2677 | */ | |
2678 | if (buffer_write_io_error(bh) && !buffer_uptodate(bh)) | |
2679 | set_buffer_uptodate(bh); | |
2680 | ||
1da177e4 LT |
2681 | if (buffer_uptodate(bh)) { |
2682 | /* someone brought it uptodate while we waited */ | |
2683 | unlock_buffer(bh); | |
2684 | goto has_buffer; | |
2685 | } | |
2686 | ||
2687 | /* | |
2688 | * If we have all information of the inode in memory and this | |
2689 | * is the only valid inode in the block, we need not read the | |
2690 | * block. | |
2691 | */ | |
2692 | if (in_mem) { | |
2693 | struct buffer_head *bitmap_bh; | |
2694 | struct ext3_group_desc *desc; | |
2695 | int inodes_per_buffer; | |
2696 | int inode_offset, i; | |
2697 | int block_group; | |
2698 | int start; | |
2699 | ||
2700 | block_group = (inode->i_ino - 1) / | |
2701 | EXT3_INODES_PER_GROUP(inode->i_sb); | |
2702 | inodes_per_buffer = bh->b_size / | |
2703 | EXT3_INODE_SIZE(inode->i_sb); | |
2704 | inode_offset = ((inode->i_ino - 1) % | |
2705 | EXT3_INODES_PER_GROUP(inode->i_sb)); | |
2706 | start = inode_offset & ~(inodes_per_buffer - 1); | |
2707 | ||
2708 | /* Is the inode bitmap in cache? */ | |
2709 | desc = ext3_get_group_desc(inode->i_sb, | |
2710 | block_group, NULL); | |
2711 | if (!desc) | |
2712 | goto make_io; | |
2713 | ||
2714 | bitmap_bh = sb_getblk(inode->i_sb, | |
2715 | le32_to_cpu(desc->bg_inode_bitmap)); | |
2716 | if (!bitmap_bh) | |
2717 | goto make_io; | |
2718 | ||
2719 | /* | |
2720 | * If the inode bitmap isn't in cache then the | |
2721 | * optimisation may end up performing two reads instead | |
2722 | * of one, so skip it. | |
2723 | */ | |
2724 | if (!buffer_uptodate(bitmap_bh)) { | |
2725 | brelse(bitmap_bh); | |
2726 | goto make_io; | |
2727 | } | |
2728 | for (i = start; i < start + inodes_per_buffer; i++) { | |
2729 | if (i == inode_offset) | |
2730 | continue; | |
2731 | if (ext3_test_bit(i, bitmap_bh->b_data)) | |
2732 | break; | |
2733 | } | |
2734 | brelse(bitmap_bh); | |
2735 | if (i == start + inodes_per_buffer) { | |
2736 | /* all other inodes are free, so skip I/O */ | |
2737 | memset(bh->b_data, 0, bh->b_size); | |
2738 | set_buffer_uptodate(bh); | |
2739 | unlock_buffer(bh); | |
2740 | goto has_buffer; | |
2741 | } | |
2742 | } | |
2743 | ||
2744 | make_io: | |
2745 | /* | |
2746 | * There are other valid inodes in the buffer, this inode | |
2747 | * has in-inode xattrs, or we don't have this inode in memory. | |
2748 | * Read the block from disk. | |
2749 | */ | |
2750 | get_bh(bh); | |
2751 | bh->b_end_io = end_buffer_read_sync; | |
caa38fb0 | 2752 | submit_bh(READ_META, bh); |
1da177e4 LT |
2753 | wait_on_buffer(bh); |
2754 | if (!buffer_uptodate(bh)) { | |
2755 | ext3_error(inode->i_sb, "ext3_get_inode_loc", | |
2756 | "unable to read inode block - " | |
43d23f90 | 2757 | "inode=%lu, block="E3FSBLK, |
1da177e4 LT |
2758 | inode->i_ino, block); |
2759 | brelse(bh); | |
2760 | return -EIO; | |
2761 | } | |
2762 | } | |
2763 | has_buffer: | |
2764 | iloc->bh = bh; | |
2765 | return 0; | |
2766 | } | |
2767 | ||
2768 | int ext3_get_inode_loc(struct inode *inode, struct ext3_iloc *iloc) | |
2769 | { | |
2770 | /* We have all inode data except xattrs in memory here. */ | |
2771 | return __ext3_get_inode_loc(inode, iloc, | |
9df93939 | 2772 | !ext3_test_inode_state(inode, EXT3_STATE_XATTR)); |
1da177e4 LT |
2773 | } |
2774 | ||
2775 | void ext3_set_inode_flags(struct inode *inode) | |
2776 | { | |
2777 | unsigned int flags = EXT3_I(inode)->i_flags; | |
2778 | ||
2779 | inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
2780 | if (flags & EXT3_SYNC_FL) | |
2781 | inode->i_flags |= S_SYNC; | |
2782 | if (flags & EXT3_APPEND_FL) | |
2783 | inode->i_flags |= S_APPEND; | |
2784 | if (flags & EXT3_IMMUTABLE_FL) | |
2785 | inode->i_flags |= S_IMMUTABLE; | |
2786 | if (flags & EXT3_NOATIME_FL) | |
2787 | inode->i_flags |= S_NOATIME; | |
2788 | if (flags & EXT3_DIRSYNC_FL) | |
2789 | inode->i_flags |= S_DIRSYNC; | |
2790 | } | |
2791 | ||
28be5abb JK |
2792 | /* Propagate flags from i_flags to EXT3_I(inode)->i_flags */ |
2793 | void ext3_get_inode_flags(struct ext3_inode_info *ei) | |
2794 | { | |
2795 | unsigned int flags = ei->vfs_inode.i_flags; | |
2796 | ||
2797 | ei->i_flags &= ~(EXT3_SYNC_FL|EXT3_APPEND_FL| | |
2798 | EXT3_IMMUTABLE_FL|EXT3_NOATIME_FL|EXT3_DIRSYNC_FL); | |
2799 | if (flags & S_SYNC) | |
2800 | ei->i_flags |= EXT3_SYNC_FL; | |
2801 | if (flags & S_APPEND) | |
2802 | ei->i_flags |= EXT3_APPEND_FL; | |
2803 | if (flags & S_IMMUTABLE) | |
2804 | ei->i_flags |= EXT3_IMMUTABLE_FL; | |
2805 | if (flags & S_NOATIME) | |
2806 | ei->i_flags |= EXT3_NOATIME_FL; | |
2807 | if (flags & S_DIRSYNC) | |
2808 | ei->i_flags |= EXT3_DIRSYNC_FL; | |
2809 | } | |
2810 | ||
473043dc | 2811 | struct inode *ext3_iget(struct super_block *sb, unsigned long ino) |
1da177e4 LT |
2812 | { |
2813 | struct ext3_iloc iloc; | |
2814 | struct ext3_inode *raw_inode; | |
473043dc | 2815 | struct ext3_inode_info *ei; |
1da177e4 | 2816 | struct buffer_head *bh; |
473043dc | 2817 | struct inode *inode; |
fe8bc91c JK |
2818 | journal_t *journal = EXT3_SB(sb)->s_journal; |
2819 | transaction_t *transaction; | |
473043dc | 2820 | long ret; |
1da177e4 LT |
2821 | int block; |
2822 | ||
473043dc DH |
2823 | inode = iget_locked(sb, ino); |
2824 | if (!inode) | |
2825 | return ERR_PTR(-ENOMEM); | |
2826 | if (!(inode->i_state & I_NEW)) | |
2827 | return inode; | |
2828 | ||
2829 | ei = EXT3_I(inode); | |
1da177e4 LT |
2830 | ei->i_block_alloc_info = NULL; |
2831 | ||
473043dc DH |
2832 | ret = __ext3_get_inode_loc(inode, &iloc, 0); |
2833 | if (ret < 0) | |
1da177e4 LT |
2834 | goto bad_inode; |
2835 | bh = iloc.bh; | |
2836 | raw_inode = ext3_raw_inode(&iloc); | |
2837 | inode->i_mode = le16_to_cpu(raw_inode->i_mode); | |
2838 | inode->i_uid = (uid_t)le16_to_cpu(raw_inode->i_uid_low); | |
2839 | inode->i_gid = (gid_t)le16_to_cpu(raw_inode->i_gid_low); | |
2840 | if(!(test_opt (inode->i_sb, NO_UID32))) { | |
2841 | inode->i_uid |= le16_to_cpu(raw_inode->i_uid_high) << 16; | |
2842 | inode->i_gid |= le16_to_cpu(raw_inode->i_gid_high) << 16; | |
2843 | } | |
2844 | inode->i_nlink = le16_to_cpu(raw_inode->i_links_count); | |
2845 | inode->i_size = le32_to_cpu(raw_inode->i_size); | |
4d7bf11d MR |
2846 | inode->i_atime.tv_sec = (signed)le32_to_cpu(raw_inode->i_atime); |
2847 | inode->i_ctime.tv_sec = (signed)le32_to_cpu(raw_inode->i_ctime); | |
2848 | inode->i_mtime.tv_sec = (signed)le32_to_cpu(raw_inode->i_mtime); | |
1da177e4 LT |
2849 | inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_mtime.tv_nsec = 0; |
2850 | ||
de329820 | 2851 | ei->i_state_flags = 0; |
1da177e4 LT |
2852 | ei->i_dir_start_lookup = 0; |
2853 | ei->i_dtime = le32_to_cpu(raw_inode->i_dtime); | |
2854 | /* We now have enough fields to check if the inode was active or not. | |
2855 | * This is needed because nfsd might try to access dead inodes | |
2856 | * the test is that same one that e2fsck uses | |
2857 | * NeilBrown 1999oct15 | |
2858 | */ | |
2859 | if (inode->i_nlink == 0) { | |
2860 | if (inode->i_mode == 0 || | |
2861 | !(EXT3_SB(inode->i_sb)->s_mount_state & EXT3_ORPHAN_FS)) { | |
2862 | /* this inode is deleted */ | |
2863 | brelse (bh); | |
473043dc | 2864 | ret = -ESTALE; |
1da177e4 LT |
2865 | goto bad_inode; |
2866 | } | |
2867 | /* The only unlinked inodes we let through here have | |
2868 | * valid i_mode and are being read by the orphan | |
2869 | * recovery code: that's fine, we're about to complete | |
2870 | * the process of deleting those. */ | |
2871 | } | |
1da177e4 LT |
2872 | inode->i_blocks = le32_to_cpu(raw_inode->i_blocks); |
2873 | ei->i_flags = le32_to_cpu(raw_inode->i_flags); | |
2874 | #ifdef EXT3_FRAGMENTS | |
2875 | ei->i_faddr = le32_to_cpu(raw_inode->i_faddr); | |
2876 | ei->i_frag_no = raw_inode->i_frag; | |
2877 | ei->i_frag_size = raw_inode->i_fsize; | |
2878 | #endif | |
2879 | ei->i_file_acl = le32_to_cpu(raw_inode->i_file_acl); | |
2880 | if (!S_ISREG(inode->i_mode)) { | |
2881 | ei->i_dir_acl = le32_to_cpu(raw_inode->i_dir_acl); | |
2882 | } else { | |
2883 | inode->i_size |= | |
2884 | ((__u64)le32_to_cpu(raw_inode->i_size_high)) << 32; | |
2885 | } | |
2886 | ei->i_disksize = inode->i_size; | |
2887 | inode->i_generation = le32_to_cpu(raw_inode->i_generation); | |
2888 | ei->i_block_group = iloc.block_group; | |
2889 | /* | |
2890 | * NOTE! The in-memory inode i_data array is in little-endian order | |
2891 | * even on big-endian machines: we do NOT byteswap the block numbers! | |
2892 | */ | |
2893 | for (block = 0; block < EXT3_N_BLOCKS; block++) | |
2894 | ei->i_data[block] = raw_inode->i_block[block]; | |
2895 | INIT_LIST_HEAD(&ei->i_orphan); | |
2896 | ||
fe8bc91c JK |
2897 | /* |
2898 | * Set transaction id's of transactions that have to be committed | |
2899 | * to finish f[data]sync. We set them to currently running transaction | |
2900 | * as we cannot be sure that the inode or some of its metadata isn't | |
2901 | * part of the transaction - the inode could have been reclaimed and | |
2902 | * now it is reread from disk. | |
2903 | */ | |
2904 | if (journal) { | |
2905 | tid_t tid; | |
2906 | ||
2907 | spin_lock(&journal->j_state_lock); | |
2908 | if (journal->j_running_transaction) | |
2909 | transaction = journal->j_running_transaction; | |
2910 | else | |
2911 | transaction = journal->j_committing_transaction; | |
2912 | if (transaction) | |
2913 | tid = transaction->t_tid; | |
2914 | else | |
2915 | tid = journal->j_commit_sequence; | |
2916 | spin_unlock(&journal->j_state_lock); | |
2917 | atomic_set(&ei->i_sync_tid, tid); | |
2918 | atomic_set(&ei->i_datasync_tid, tid); | |
2919 | } | |
2920 | ||
1da177e4 LT |
2921 | if (inode->i_ino >= EXT3_FIRST_INO(inode->i_sb) + 1 && |
2922 | EXT3_INODE_SIZE(inode->i_sb) > EXT3_GOOD_OLD_INODE_SIZE) { | |
2923 | /* | |
2924 | * When mke2fs creates big inodes it does not zero out | |
2925 | * the unused bytes above EXT3_GOOD_OLD_INODE_SIZE, | |
2926 | * so ignore those first few inodes. | |
2927 | */ | |
2928 | ei->i_extra_isize = le16_to_cpu(raw_inode->i_extra_isize); | |
2929 | if (EXT3_GOOD_OLD_INODE_SIZE + ei->i_extra_isize > | |
e4a10a36 KK |
2930 | EXT3_INODE_SIZE(inode->i_sb)) { |
2931 | brelse (bh); | |
473043dc | 2932 | ret = -EIO; |
1da177e4 | 2933 | goto bad_inode; |
e4a10a36 | 2934 | } |
1da177e4 LT |
2935 | if (ei->i_extra_isize == 0) { |
2936 | /* The extra space is currently unused. Use it. */ | |
2937 | ei->i_extra_isize = sizeof(struct ext3_inode) - | |
2938 | EXT3_GOOD_OLD_INODE_SIZE; | |
2939 | } else { | |
2940 | __le32 *magic = (void *)raw_inode + | |
2941 | EXT3_GOOD_OLD_INODE_SIZE + | |
2942 | ei->i_extra_isize; | |
2943 | if (*magic == cpu_to_le32(EXT3_XATTR_MAGIC)) | |
9df93939 | 2944 | ext3_set_inode_state(inode, EXT3_STATE_XATTR); |
1da177e4 LT |
2945 | } |
2946 | } else | |
2947 | ei->i_extra_isize = 0; | |
2948 | ||
2949 | if (S_ISREG(inode->i_mode)) { | |
2950 | inode->i_op = &ext3_file_inode_operations; | |
2951 | inode->i_fop = &ext3_file_operations; | |
2952 | ext3_set_aops(inode); | |
2953 | } else if (S_ISDIR(inode->i_mode)) { | |
2954 | inode->i_op = &ext3_dir_inode_operations; | |
2955 | inode->i_fop = &ext3_dir_operations; | |
2956 | } else if (S_ISLNK(inode->i_mode)) { | |
b5ed3112 | 2957 | if (ext3_inode_is_fast_symlink(inode)) { |
1da177e4 | 2958 | inode->i_op = &ext3_fast_symlink_inode_operations; |
b5ed3112 DG |
2959 | nd_terminate_link(ei->i_data, inode->i_size, |
2960 | sizeof(ei->i_data) - 1); | |
2961 | } else { | |
1da177e4 LT |
2962 | inode->i_op = &ext3_symlink_inode_operations; |
2963 | ext3_set_aops(inode); | |
2964 | } | |
2965 | } else { | |
2966 | inode->i_op = &ext3_special_inode_operations; | |
2967 | if (raw_inode->i_block[0]) | |
2968 | init_special_inode(inode, inode->i_mode, | |
2969 | old_decode_dev(le32_to_cpu(raw_inode->i_block[0]))); | |
ae6ddcc5 | 2970 | else |
1da177e4 LT |
2971 | init_special_inode(inode, inode->i_mode, |
2972 | new_decode_dev(le32_to_cpu(raw_inode->i_block[1]))); | |
2973 | } | |
2974 | brelse (iloc.bh); | |
2975 | ext3_set_inode_flags(inode); | |
473043dc DH |
2976 | unlock_new_inode(inode); |
2977 | return inode; | |
1da177e4 LT |
2978 | |
2979 | bad_inode: | |
473043dc DH |
2980 | iget_failed(inode); |
2981 | return ERR_PTR(ret); | |
1da177e4 LT |
2982 | } |
2983 | ||
2984 | /* | |
2985 | * Post the struct inode info into an on-disk inode location in the | |
2986 | * buffer-cache. This gobbles the caller's reference to the | |
2987 | * buffer_head in the inode location struct. | |
2988 | * | |
2989 | * The caller must have write access to iloc->bh. | |
2990 | */ | |
ae6ddcc5 MC |
2991 | static int ext3_do_update_inode(handle_t *handle, |
2992 | struct inode *inode, | |
1da177e4 LT |
2993 | struct ext3_iloc *iloc) |
2994 | { | |
2995 | struct ext3_inode *raw_inode = ext3_raw_inode(iloc); | |
2996 | struct ext3_inode_info *ei = EXT3_I(inode); | |
2997 | struct buffer_head *bh = iloc->bh; | |
2998 | int err = 0, rc, block; | |
2999 | ||
4f003fd3 CM |
3000 | again: |
3001 | /* we can't allow multiple procs in here at once, its a bit racey */ | |
3002 | lock_buffer(bh); | |
3003 | ||
1da177e4 LT |
3004 | /* For fields not not tracking in the in-memory inode, |
3005 | * initialise them to zero for new inodes. */ | |
9df93939 | 3006 | if (ext3_test_inode_state(inode, EXT3_STATE_NEW)) |
1da177e4 LT |
3007 | memset(raw_inode, 0, EXT3_SB(inode->i_sb)->s_inode_size); |
3008 | ||
28be5abb | 3009 | ext3_get_inode_flags(ei); |
1da177e4 LT |
3010 | raw_inode->i_mode = cpu_to_le16(inode->i_mode); |
3011 | if(!(test_opt(inode->i_sb, NO_UID32))) { | |
3012 | raw_inode->i_uid_low = cpu_to_le16(low_16_bits(inode->i_uid)); | |
3013 | raw_inode->i_gid_low = cpu_to_le16(low_16_bits(inode->i_gid)); | |
3014 | /* | |
3015 | * Fix up interoperability with old kernels. Otherwise, old inodes get | |
3016 | * re-used with the upper 16 bits of the uid/gid intact | |
3017 | */ | |
3018 | if(!ei->i_dtime) { | |
3019 | raw_inode->i_uid_high = | |
3020 | cpu_to_le16(high_16_bits(inode->i_uid)); | |
3021 | raw_inode->i_gid_high = | |
3022 | cpu_to_le16(high_16_bits(inode->i_gid)); | |
3023 | } else { | |
3024 | raw_inode->i_uid_high = 0; | |
3025 | raw_inode->i_gid_high = 0; | |
3026 | } | |
3027 | } else { | |
3028 | raw_inode->i_uid_low = | |
3029 | cpu_to_le16(fs_high2lowuid(inode->i_uid)); | |
3030 | raw_inode->i_gid_low = | |
3031 | cpu_to_le16(fs_high2lowgid(inode->i_gid)); | |
3032 | raw_inode->i_uid_high = 0; | |
3033 | raw_inode->i_gid_high = 0; | |
3034 | } | |
3035 | raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); | |
3036 | raw_inode->i_size = cpu_to_le32(ei->i_disksize); | |
3037 | raw_inode->i_atime = cpu_to_le32(inode->i_atime.tv_sec); | |
3038 | raw_inode->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); | |
3039 | raw_inode->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); | |
3040 | raw_inode->i_blocks = cpu_to_le32(inode->i_blocks); | |
3041 | raw_inode->i_dtime = cpu_to_le32(ei->i_dtime); | |
3042 | raw_inode->i_flags = cpu_to_le32(ei->i_flags); | |
3043 | #ifdef EXT3_FRAGMENTS | |
3044 | raw_inode->i_faddr = cpu_to_le32(ei->i_faddr); | |
3045 | raw_inode->i_frag = ei->i_frag_no; | |
3046 | raw_inode->i_fsize = ei->i_frag_size; | |
3047 | #endif | |
3048 | raw_inode->i_file_acl = cpu_to_le32(ei->i_file_acl); | |
3049 | if (!S_ISREG(inode->i_mode)) { | |
3050 | raw_inode->i_dir_acl = cpu_to_le32(ei->i_dir_acl); | |
3051 | } else { | |
3052 | raw_inode->i_size_high = | |
3053 | cpu_to_le32(ei->i_disksize >> 32); | |
3054 | if (ei->i_disksize > 0x7fffffffULL) { | |
3055 | struct super_block *sb = inode->i_sb; | |
3056 | if (!EXT3_HAS_RO_COMPAT_FEATURE(sb, | |
3057 | EXT3_FEATURE_RO_COMPAT_LARGE_FILE) || | |
3058 | EXT3_SB(sb)->s_es->s_rev_level == | |
3059 | cpu_to_le32(EXT3_GOOD_OLD_REV)) { | |
3060 | /* If this is the first large file | |
3061 | * created, add a flag to the superblock. | |
3062 | */ | |
4f003fd3 | 3063 | unlock_buffer(bh); |
1da177e4 LT |
3064 | err = ext3_journal_get_write_access(handle, |
3065 | EXT3_SB(sb)->s_sbh); | |
3066 | if (err) | |
3067 | goto out_brelse; | |
4f003fd3 | 3068 | |
1da177e4 LT |
3069 | ext3_update_dynamic_rev(sb); |
3070 | EXT3_SET_RO_COMPAT_FEATURE(sb, | |
3071 | EXT3_FEATURE_RO_COMPAT_LARGE_FILE); | |
1da177e4 LT |
3072 | handle->h_sync = 1; |
3073 | err = ext3_journal_dirty_metadata(handle, | |
3074 | EXT3_SB(sb)->s_sbh); | |
4f003fd3 CM |
3075 | /* get our lock and start over */ |
3076 | goto again; | |
1da177e4 LT |
3077 | } |
3078 | } | |
3079 | } | |
3080 | raw_inode->i_generation = cpu_to_le32(inode->i_generation); | |
3081 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { | |
3082 | if (old_valid_dev(inode->i_rdev)) { | |
3083 | raw_inode->i_block[0] = | |
3084 | cpu_to_le32(old_encode_dev(inode->i_rdev)); | |
3085 | raw_inode->i_block[1] = 0; | |
3086 | } else { | |
3087 | raw_inode->i_block[0] = 0; | |
3088 | raw_inode->i_block[1] = | |
3089 | cpu_to_le32(new_encode_dev(inode->i_rdev)); | |
3090 | raw_inode->i_block[2] = 0; | |
3091 | } | |
3092 | } else for (block = 0; block < EXT3_N_BLOCKS; block++) | |
3093 | raw_inode->i_block[block] = ei->i_data[block]; | |
3094 | ||
ff87b37d | 3095 | if (ei->i_extra_isize) |
1da177e4 LT |
3096 | raw_inode->i_extra_isize = cpu_to_le16(ei->i_extra_isize); |
3097 | ||
3098 | BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata"); | |
4f003fd3 | 3099 | unlock_buffer(bh); |
1da177e4 LT |
3100 | rc = ext3_journal_dirty_metadata(handle, bh); |
3101 | if (!err) | |
3102 | err = rc; | |
9df93939 | 3103 | ext3_clear_inode_state(inode, EXT3_STATE_NEW); |
1da177e4 | 3104 | |
fe8bc91c | 3105 | atomic_set(&ei->i_sync_tid, handle->h_transaction->t_tid); |
1da177e4 LT |
3106 | out_brelse: |
3107 | brelse (bh); | |
3108 | ext3_std_error(inode->i_sb, err); | |
3109 | return err; | |
3110 | } | |
3111 | ||
3112 | /* | |
3113 | * ext3_write_inode() | |
3114 | * | |
3115 | * We are called from a few places: | |
3116 | * | |
3117 | * - Within generic_file_write() for O_SYNC files. | |
3118 | * Here, there will be no transaction running. We wait for any running | |
3119 | * trasnaction to commit. | |
3120 | * | |
3121 | * - Within sys_sync(), kupdate and such. | |
3122 | * We wait on commit, if tol to. | |
3123 | * | |
3124 | * - Within prune_icache() (PF_MEMALLOC == true) | |
3125 | * Here we simply return. We can't afford to block kswapd on the | |
3126 | * journal commit. | |
3127 | * | |
3128 | * In all cases it is actually safe for us to return without doing anything, | |
3129 | * because the inode has been copied into a raw inode buffer in | |
3130 | * ext3_mark_inode_dirty(). This is a correctness thing for O_SYNC and for | |
3131 | * knfsd. | |
3132 | * | |
3133 | * Note that we are absolutely dependent upon all inode dirtiers doing the | |
3134 | * right thing: they *must* call mark_inode_dirty() after dirtying info in | |
3135 | * which we are interested. | |
3136 | * | |
3137 | * It would be a bug for them to not do this. The code: | |
3138 | * | |
3139 | * mark_inode_dirty(inode) | |
3140 | * stuff(); | |
3141 | * inode->i_size = expr; | |
3142 | * | |
3143 | * is in error because a kswapd-driven write_inode() could occur while | |
3144 | * `stuff()' is running, and the new i_size will be lost. Plus the inode | |
3145 | * will no longer be on the superblock's dirty inode list. | |
3146 | */ | |
a9185b41 | 3147 | int ext3_write_inode(struct inode *inode, struct writeback_control *wbc) |
1da177e4 LT |
3148 | { |
3149 | if (current->flags & PF_MEMALLOC) | |
3150 | return 0; | |
3151 | ||
3152 | if (ext3_journal_current_handle()) { | |
9ad163ae | 3153 | jbd_debug(1, "called recursively, non-PF_MEMALLOC!\n"); |
1da177e4 LT |
3154 | dump_stack(); |
3155 | return -EIO; | |
3156 | } | |
3157 | ||
a9185b41 | 3158 | if (wbc->sync_mode != WB_SYNC_ALL) |
1da177e4 LT |
3159 | return 0; |
3160 | ||
3161 | return ext3_force_commit(inode->i_sb); | |
3162 | } | |
3163 | ||
3164 | /* | |
3165 | * ext3_setattr() | |
3166 | * | |
3167 | * Called from notify_change. | |
3168 | * | |
3169 | * We want to trap VFS attempts to truncate the file as soon as | |
3170 | * possible. In particular, we want to make sure that when the VFS | |
3171 | * shrinks i_size, we put the inode on the orphan list and modify | |
3172 | * i_disksize immediately, so that during the subsequent flushing of | |
3173 | * dirty pages and freeing of disk blocks, we can guarantee that any | |
3174 | * commit will leave the blocks being flushed in an unused state on | |
3175 | * disk. (On recovery, the inode will get truncated and the blocks will | |
3176 | * be freed, so we have a strong guarantee that no future commit will | |
ae6ddcc5 | 3177 | * leave these blocks visible to the user.) |
1da177e4 LT |
3178 | * |
3179 | * Called with inode->sem down. | |
3180 | */ | |
3181 | int ext3_setattr(struct dentry *dentry, struct iattr *attr) | |
3182 | { | |
3183 | struct inode *inode = dentry->d_inode; | |
3184 | int error, rc = 0; | |
3185 | const unsigned int ia_valid = attr->ia_valid; | |
3186 | ||
3187 | error = inode_change_ok(inode, attr); | |
3188 | if (error) | |
3189 | return error; | |
3190 | ||
12755627 | 3191 | if (is_quota_modification(inode, attr)) |
871a2931 | 3192 | dquot_initialize(inode); |
1da177e4 LT |
3193 | if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) || |
3194 | (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) { | |
3195 | handle_t *handle; | |
3196 | ||
3197 | /* (user+group)*(old+new) structure, inode write (sb, | |
3198 | * inode block, ? - but truncate inode update has it) */ | |
c459001f DM |
3199 | handle = ext3_journal_start(inode, EXT3_MAXQUOTAS_INIT_BLOCKS(inode->i_sb)+ |
3200 | EXT3_MAXQUOTAS_DEL_BLOCKS(inode->i_sb)+3); | |
1da177e4 LT |
3201 | if (IS_ERR(handle)) { |
3202 | error = PTR_ERR(handle); | |
3203 | goto err_out; | |
3204 | } | |
b43fa828 | 3205 | error = dquot_transfer(inode, attr); |
1da177e4 LT |
3206 | if (error) { |
3207 | ext3_journal_stop(handle); | |
3208 | return error; | |
3209 | } | |
3210 | /* Update corresponding info in inode so that everything is in | |
3211 | * one transaction */ | |
3212 | if (attr->ia_valid & ATTR_UID) | |
3213 | inode->i_uid = attr->ia_uid; | |
3214 | if (attr->ia_valid & ATTR_GID) | |
3215 | inode->i_gid = attr->ia_gid; | |
3216 | error = ext3_mark_inode_dirty(handle, inode); | |
3217 | ext3_journal_stop(handle); | |
3218 | } | |
3219 | ||
3220 | if (S_ISREG(inode->i_mode) && | |
3221 | attr->ia_valid & ATTR_SIZE && attr->ia_size < inode->i_size) { | |
3222 | handle_t *handle; | |
3223 | ||
3224 | handle = ext3_journal_start(inode, 3); | |
3225 | if (IS_ERR(handle)) { | |
3226 | error = PTR_ERR(handle); | |
3227 | goto err_out; | |
3228 | } | |
3229 | ||
3230 | error = ext3_orphan_add(handle, inode); | |
3231 | EXT3_I(inode)->i_disksize = attr->ia_size; | |
3232 | rc = ext3_mark_inode_dirty(handle, inode); | |
3233 | if (!error) | |
3234 | error = rc; | |
3235 | ext3_journal_stop(handle); | |
3236 | } | |
3237 | ||
1025774c CH |
3238 | if ((attr->ia_valid & ATTR_SIZE) && |
3239 | attr->ia_size != i_size_read(inode)) { | |
3240 | rc = vmtruncate(inode, attr->ia_size); | |
3241 | if (rc) | |
3242 | goto err_out; | |
3243 | } | |
3244 | ||
3245 | setattr_copy(inode, attr); | |
3246 | mark_inode_dirty(inode); | |
1da177e4 | 3247 | |
1025774c | 3248 | if (ia_valid & ATTR_MODE) |
1da177e4 LT |
3249 | rc = ext3_acl_chmod(inode); |
3250 | ||
3251 | err_out: | |
3252 | ext3_std_error(inode->i_sb, error); | |
3253 | if (!error) | |
3254 | error = rc; | |
3255 | return error; | |
3256 | } | |
3257 | ||
3258 | ||
3259 | /* | |
d6859bfc | 3260 | * How many blocks doth make a writepage()? |
1da177e4 LT |
3261 | * |
3262 | * With N blocks per page, it may be: | |
3263 | * N data blocks | |
3264 | * 2 indirect block | |
3265 | * 2 dindirect | |
3266 | * 1 tindirect | |
3267 | * N+5 bitmap blocks (from the above) | |
3268 | * N+5 group descriptor summary blocks | |
3269 | * 1 inode block | |
3270 | * 1 superblock. | |
3271 | * 2 * EXT3_SINGLEDATA_TRANS_BLOCKS for the quote files | |
3272 | * | |
3273 | * 3 * (N + 5) + 2 + 2 * EXT3_SINGLEDATA_TRANS_BLOCKS | |
3274 | * | |
3275 | * With ordered or writeback data it's the same, less the N data blocks. | |
3276 | * | |
3277 | * If the inode's direct blocks can hold an integral number of pages then a | |
3278 | * page cannot straddle two indirect blocks, and we can only touch one indirect | |
3279 | * and dindirect block, and the "5" above becomes "3". | |
3280 | * | |
3281 | * This still overestimates under most circumstances. If we were to pass the | |
3282 | * start and end offsets in here as well we could do block_to_path() on each | |
3283 | * block and work out the exact number of indirects which are touched. Pah. | |
3284 | */ | |
3285 | ||
3286 | static int ext3_writepage_trans_blocks(struct inode *inode) | |
3287 | { | |
3288 | int bpp = ext3_journal_blocks_per_page(inode); | |
3289 | int indirects = (EXT3_NDIR_BLOCKS % bpp) ? 5 : 3; | |
3290 | int ret; | |
3291 | ||
3292 | if (ext3_should_journal_data(inode)) | |
3293 | ret = 3 * (bpp + indirects) + 2; | |
3294 | else | |
3295 | ret = 2 * (bpp + indirects) + 2; | |
3296 | ||
3297 | #ifdef CONFIG_QUOTA | |
871a2931 | 3298 | /* We know that structure was already allocated during dquot_initialize so |
1da177e4 | 3299 | * we will be updating only the data blocks + inodes */ |
c459001f | 3300 | ret += EXT3_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb); |
1da177e4 LT |
3301 | #endif |
3302 | ||
3303 | return ret; | |
3304 | } | |
3305 | ||
3306 | /* | |
3307 | * The caller must have previously called ext3_reserve_inode_write(). | |
3308 | * Give this, we know that the caller already has write access to iloc->bh. | |
3309 | */ | |
3310 | int ext3_mark_iloc_dirty(handle_t *handle, | |
3311 | struct inode *inode, struct ext3_iloc *iloc) | |
3312 | { | |
3313 | int err = 0; | |
3314 | ||
3315 | /* the do_update_inode consumes one bh->b_count */ | |
3316 | get_bh(iloc->bh); | |
3317 | ||
3318 | /* ext3_do_update_inode() does journal_dirty_metadata */ | |
3319 | err = ext3_do_update_inode(handle, inode, iloc); | |
3320 | put_bh(iloc->bh); | |
3321 | return err; | |
3322 | } | |
3323 | ||
ae6ddcc5 | 3324 | /* |
1da177e4 | 3325 | * On success, We end up with an outstanding reference count against |
ae6ddcc5 | 3326 | * iloc->bh. This _must_ be cleaned up later. |
1da177e4 LT |
3327 | */ |
3328 | ||
3329 | int | |
ae6ddcc5 | 3330 | ext3_reserve_inode_write(handle_t *handle, struct inode *inode, |
1da177e4 LT |
3331 | struct ext3_iloc *iloc) |
3332 | { | |
3333 | int err = 0; | |
3334 | if (handle) { | |
3335 | err = ext3_get_inode_loc(inode, iloc); | |
3336 | if (!err) { | |
3337 | BUFFER_TRACE(iloc->bh, "get_write_access"); | |
3338 | err = ext3_journal_get_write_access(handle, iloc->bh); | |
3339 | if (err) { | |
3340 | brelse(iloc->bh); | |
3341 | iloc->bh = NULL; | |
3342 | } | |
3343 | } | |
3344 | } | |
3345 | ext3_std_error(inode->i_sb, err); | |
3346 | return err; | |
3347 | } | |
3348 | ||
3349 | /* | |
d6859bfc AM |
3350 | * What we do here is to mark the in-core inode as clean with respect to inode |
3351 | * dirtiness (it may still be data-dirty). | |
1da177e4 LT |
3352 | * This means that the in-core inode may be reaped by prune_icache |
3353 | * without having to perform any I/O. This is a very good thing, | |
3354 | * because *any* task may call prune_icache - even ones which | |
3355 | * have a transaction open against a different journal. | |
3356 | * | |
3357 | * Is this cheating? Not really. Sure, we haven't written the | |
3358 | * inode out, but prune_icache isn't a user-visible syncing function. | |
3359 | * Whenever the user wants stuff synced (sys_sync, sys_msync, sys_fsync) | |
3360 | * we start and wait on commits. | |
3361 | * | |
3362 | * Is this efficient/effective? Well, we're being nice to the system | |
3363 | * by cleaning up our inodes proactively so they can be reaped | |
3364 | * without I/O. But we are potentially leaving up to five seconds' | |
3365 | * worth of inodes floating about which prune_icache wants us to | |
3366 | * write out. One way to fix that would be to get prune_icache() | |
3367 | * to do a write_super() to free up some memory. It has the desired | |
3368 | * effect. | |
3369 | */ | |
3370 | int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode) | |
3371 | { | |
3372 | struct ext3_iloc iloc; | |
3373 | int err; | |
3374 | ||
3375 | might_sleep(); | |
3376 | err = ext3_reserve_inode_write(handle, inode, &iloc); | |
3377 | if (!err) | |
3378 | err = ext3_mark_iloc_dirty(handle, inode, &iloc); | |
3379 | return err; | |
3380 | } | |
3381 | ||
3382 | /* | |
d6859bfc | 3383 | * ext3_dirty_inode() is called from __mark_inode_dirty() |
1da177e4 LT |
3384 | * |
3385 | * We're really interested in the case where a file is being extended. | |
3386 | * i_size has been changed by generic_commit_write() and we thus need | |
3387 | * to include the updated inode in the current transaction. | |
3388 | * | |
5dd4056d | 3389 | * Also, dquot_alloc_space() will always dirty the inode when blocks |
1da177e4 LT |
3390 | * are allocated to the file. |
3391 | * | |
3392 | * If the inode is marked synchronous, we don't honour that here - doing | |
3393 | * so would cause a commit on atime updates, which we don't bother doing. | |
3394 | * We handle synchronous inodes at the highest possible level. | |
3395 | */ | |
3396 | void ext3_dirty_inode(struct inode *inode) | |
3397 | { | |
3398 | handle_t *current_handle = ext3_journal_current_handle(); | |
3399 | handle_t *handle; | |
3400 | ||
3401 | handle = ext3_journal_start(inode, 2); | |
3402 | if (IS_ERR(handle)) | |
3403 | goto out; | |
3404 | if (current_handle && | |
3405 | current_handle->h_transaction != handle->h_transaction) { | |
3406 | /* This task has a transaction open against a different fs */ | |
3407 | printk(KERN_EMERG "%s: transactions do not match!\n", | |
e05b6b52 | 3408 | __func__); |
1da177e4 LT |
3409 | } else { |
3410 | jbd_debug(5, "marking dirty. outer handle=%p\n", | |
3411 | current_handle); | |
3412 | ext3_mark_inode_dirty(handle, inode); | |
3413 | } | |
3414 | ext3_journal_stop(handle); | |
3415 | out: | |
3416 | return; | |
3417 | } | |
3418 | ||
d6859bfc | 3419 | #if 0 |
ae6ddcc5 | 3420 | /* |
1da177e4 LT |
3421 | * Bind an inode's backing buffer_head into this transaction, to prevent |
3422 | * it from being flushed to disk early. Unlike | |
3423 | * ext3_reserve_inode_write, this leaves behind no bh reference and | |
3424 | * returns no iloc structure, so the caller needs to repeat the iloc | |
3425 | * lookup to mark the inode dirty later. | |
3426 | */ | |
d6859bfc | 3427 | static int ext3_pin_inode(handle_t *handle, struct inode *inode) |
1da177e4 LT |
3428 | { |
3429 | struct ext3_iloc iloc; | |
3430 | ||
3431 | int err = 0; | |
3432 | if (handle) { | |
3433 | err = ext3_get_inode_loc(inode, &iloc); | |
3434 | if (!err) { | |
3435 | BUFFER_TRACE(iloc.bh, "get_write_access"); | |
3436 | err = journal_get_write_access(handle, iloc.bh); | |
3437 | if (!err) | |
ae6ddcc5 | 3438 | err = ext3_journal_dirty_metadata(handle, |
1da177e4 LT |
3439 | iloc.bh); |
3440 | brelse(iloc.bh); | |
3441 | } | |
3442 | } | |
3443 | ext3_std_error(inode->i_sb, err); | |
3444 | return err; | |
3445 | } | |
3446 | #endif | |
3447 | ||
3448 | int ext3_change_inode_journal_flag(struct inode *inode, int val) | |
3449 | { | |
3450 | journal_t *journal; | |
3451 | handle_t *handle; | |
3452 | int err; | |
3453 | ||
3454 | /* | |
3455 | * We have to be very careful here: changing a data block's | |
3456 | * journaling status dynamically is dangerous. If we write a | |
3457 | * data block to the journal, change the status and then delete | |
3458 | * that block, we risk forgetting to revoke the old log record | |
3459 | * from the journal and so a subsequent replay can corrupt data. | |
3460 | * So, first we make sure that the journal is empty and that | |
3461 | * nobody is changing anything. | |
3462 | */ | |
3463 | ||
3464 | journal = EXT3_JOURNAL(inode); | |
e3a68e30 | 3465 | if (is_journal_aborted(journal)) |
1da177e4 LT |
3466 | return -EROFS; |
3467 | ||
3468 | journal_lock_updates(journal); | |
3469 | journal_flush(journal); | |
3470 | ||
3471 | /* | |
3472 | * OK, there are no updates running now, and all cached data is | |
3473 | * synced to disk. We are now in a completely consistent state | |
3474 | * which doesn't have anything in the journal, and we know that | |
3475 | * no filesystem updates are running, so it is safe to modify | |
3476 | * the inode's in-core data-journaling state flag now. | |
3477 | */ | |
3478 | ||
3479 | if (val) | |
3480 | EXT3_I(inode)->i_flags |= EXT3_JOURNAL_DATA_FL; | |
3481 | else | |
3482 | EXT3_I(inode)->i_flags &= ~EXT3_JOURNAL_DATA_FL; | |
3483 | ext3_set_aops(inode); | |
3484 | ||
3485 | journal_unlock_updates(journal); | |
3486 | ||
3487 | /* Finally we can mark the inode as dirty. */ | |
3488 | ||
3489 | handle = ext3_journal_start(inode, 1); | |
3490 | if (IS_ERR(handle)) | |
3491 | return PTR_ERR(handle); | |
3492 | ||
3493 | err = ext3_mark_inode_dirty(handle, inode); | |
3494 | handle->h_sync = 1; | |
3495 | ext3_journal_stop(handle); | |
3496 | ext3_std_error(inode->i_sb, err); | |
3497 | ||
3498 | return err; | |
3499 | } |