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ccd979bd MF |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * Copyright (C) 2002, 2004 Oracle. All rights reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public | |
17 | * License along with this program; if not, write to the | |
18 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | * Boston, MA 021110-1307, USA. | |
20 | */ | |
21 | ||
22 | #include <linux/fs.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/highmem.h> | |
25 | #include <linux/pagemap.h> | |
26 | #include <asm/byteorder.h> | |
9517bac6 | 27 | #include <linux/swap.h> |
6af67d82 | 28 | #include <linux/pipe_fs_i.h> |
ccd979bd MF |
29 | |
30 | #define MLOG_MASK_PREFIX ML_FILE_IO | |
31 | #include <cluster/masklog.h> | |
32 | ||
33 | #include "ocfs2.h" | |
34 | ||
35 | #include "alloc.h" | |
36 | #include "aops.h" | |
37 | #include "dlmglue.h" | |
38 | #include "extent_map.h" | |
39 | #include "file.h" | |
40 | #include "inode.h" | |
41 | #include "journal.h" | |
9517bac6 | 42 | #include "suballoc.h" |
ccd979bd MF |
43 | #include "super.h" |
44 | #include "symlink.h" | |
45 | ||
46 | #include "buffer_head_io.h" | |
47 | ||
48 | static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock, | |
49 | struct buffer_head *bh_result, int create) | |
50 | { | |
51 | int err = -EIO; | |
52 | int status; | |
53 | struct ocfs2_dinode *fe = NULL; | |
54 | struct buffer_head *bh = NULL; | |
55 | struct buffer_head *buffer_cache_bh = NULL; | |
56 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
57 | void *kaddr; | |
58 | ||
59 | mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode, | |
60 | (unsigned long long)iblock, bh_result, create); | |
61 | ||
62 | BUG_ON(ocfs2_inode_is_fast_symlink(inode)); | |
63 | ||
64 | if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) { | |
65 | mlog(ML_ERROR, "block offset > PATH_MAX: %llu", | |
66 | (unsigned long long)iblock); | |
67 | goto bail; | |
68 | } | |
69 | ||
70 | status = ocfs2_read_block(OCFS2_SB(inode->i_sb), | |
71 | OCFS2_I(inode)->ip_blkno, | |
72 | &bh, OCFS2_BH_CACHED, inode); | |
73 | if (status < 0) { | |
74 | mlog_errno(status); | |
75 | goto bail; | |
76 | } | |
77 | fe = (struct ocfs2_dinode *) bh->b_data; | |
78 | ||
79 | if (!OCFS2_IS_VALID_DINODE(fe)) { | |
b0697053 | 80 | mlog(ML_ERROR, "Invalid dinode #%llu: signature = %.*s\n", |
1ca1a111 MF |
81 | (unsigned long long)le64_to_cpu(fe->i_blkno), 7, |
82 | fe->i_signature); | |
ccd979bd MF |
83 | goto bail; |
84 | } | |
85 | ||
86 | if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb, | |
87 | le32_to_cpu(fe->i_clusters))) { | |
88 | mlog(ML_ERROR, "block offset is outside the allocated size: " | |
89 | "%llu\n", (unsigned long long)iblock); | |
90 | goto bail; | |
91 | } | |
92 | ||
93 | /* We don't use the page cache to create symlink data, so if | |
94 | * need be, copy it over from the buffer cache. */ | |
95 | if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) { | |
96 | u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + | |
97 | iblock; | |
98 | buffer_cache_bh = sb_getblk(osb->sb, blkno); | |
99 | if (!buffer_cache_bh) { | |
100 | mlog(ML_ERROR, "couldn't getblock for symlink!\n"); | |
101 | goto bail; | |
102 | } | |
103 | ||
104 | /* we haven't locked out transactions, so a commit | |
105 | * could've happened. Since we've got a reference on | |
106 | * the bh, even if it commits while we're doing the | |
107 | * copy, the data is still good. */ | |
108 | if (buffer_jbd(buffer_cache_bh) | |
109 | && ocfs2_inode_is_new(inode)) { | |
110 | kaddr = kmap_atomic(bh_result->b_page, KM_USER0); | |
111 | if (!kaddr) { | |
112 | mlog(ML_ERROR, "couldn't kmap!\n"); | |
113 | goto bail; | |
114 | } | |
115 | memcpy(kaddr + (bh_result->b_size * iblock), | |
116 | buffer_cache_bh->b_data, | |
117 | bh_result->b_size); | |
118 | kunmap_atomic(kaddr, KM_USER0); | |
119 | set_buffer_uptodate(bh_result); | |
120 | } | |
121 | brelse(buffer_cache_bh); | |
122 | } | |
123 | ||
124 | map_bh(bh_result, inode->i_sb, | |
125 | le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock); | |
126 | ||
127 | err = 0; | |
128 | ||
129 | bail: | |
130 | if (bh) | |
131 | brelse(bh); | |
132 | ||
133 | mlog_exit(err); | |
134 | return err; | |
135 | } | |
136 | ||
137 | static int ocfs2_get_block(struct inode *inode, sector_t iblock, | |
138 | struct buffer_head *bh_result, int create) | |
139 | { | |
140 | int err = 0; | |
49cb8d2d | 141 | unsigned int ext_flags; |
ccd979bd | 142 | u64 p_blkno, past_eof; |
25baf2da | 143 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
144 | |
145 | mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode, | |
146 | (unsigned long long)iblock, bh_result, create); | |
147 | ||
148 | if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) | |
149 | mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n", | |
150 | inode, inode->i_ino); | |
151 | ||
152 | if (S_ISLNK(inode->i_mode)) { | |
153 | /* this always does I/O for some reason. */ | |
154 | err = ocfs2_symlink_get_block(inode, iblock, bh_result, create); | |
155 | goto bail; | |
156 | } | |
157 | ||
49cb8d2d MF |
158 | err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, NULL, |
159 | &ext_flags); | |
ccd979bd MF |
160 | if (err) { |
161 | mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, " | |
b0697053 MF |
162 | "%llu, NULL)\n", err, inode, (unsigned long long)iblock, |
163 | (unsigned long long)p_blkno); | |
ccd979bd MF |
164 | goto bail; |
165 | } | |
166 | ||
25baf2da MF |
167 | /* |
168 | * ocfs2 never allocates in this function - the only time we | |
169 | * need to use BH_New is when we're extending i_size on a file | |
170 | * system which doesn't support holes, in which case BH_New | |
171 | * allows block_prepare_write() to zero. | |
172 | */ | |
173 | mlog_bug_on_msg(create && p_blkno == 0 && ocfs2_sparse_alloc(osb), | |
174 | "ino %lu, iblock %llu\n", inode->i_ino, | |
175 | (unsigned long long)iblock); | |
176 | ||
49cb8d2d MF |
177 | /* Treat the unwritten extent as a hole for zeroing purposes. */ |
178 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) | |
25baf2da MF |
179 | map_bh(bh_result, inode->i_sb, p_blkno); |
180 | ||
181 | if (!ocfs2_sparse_alloc(osb)) { | |
182 | if (p_blkno == 0) { | |
183 | err = -EIO; | |
184 | mlog(ML_ERROR, | |
185 | "iblock = %llu p_blkno = %llu blkno=(%llu)\n", | |
186 | (unsigned long long)iblock, | |
187 | (unsigned long long)p_blkno, | |
188 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
189 | mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters); | |
190 | dump_stack(); | |
191 | } | |
ccd979bd | 192 | |
25baf2da MF |
193 | past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); |
194 | mlog(0, "Inode %lu, past_eof = %llu\n", inode->i_ino, | |
195 | (unsigned long long)past_eof); | |
ccd979bd | 196 | |
25baf2da MF |
197 | if (create && (iblock >= past_eof)) |
198 | set_buffer_new(bh_result); | |
199 | } | |
ccd979bd MF |
200 | |
201 | bail: | |
202 | if (err < 0) | |
203 | err = -EIO; | |
204 | ||
205 | mlog_exit(err); | |
206 | return err; | |
207 | } | |
208 | ||
209 | static int ocfs2_readpage(struct file *file, struct page *page) | |
210 | { | |
211 | struct inode *inode = page->mapping->host; | |
212 | loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
213 | int ret, unlock = 1; | |
214 | ||
215 | mlog_entry("(0x%p, %lu)\n", file, (page ? page->index : 0)); | |
216 | ||
4bcec184 | 217 | ret = ocfs2_meta_lock_with_page(inode, NULL, 0, page); |
ccd979bd MF |
218 | if (ret != 0) { |
219 | if (ret == AOP_TRUNCATED_PAGE) | |
220 | unlock = 0; | |
221 | mlog_errno(ret); | |
222 | goto out; | |
223 | } | |
224 | ||
225 | down_read(&OCFS2_I(inode)->ip_alloc_sem); | |
226 | ||
227 | /* | |
228 | * i_size might have just been updated as we grabed the meta lock. We | |
229 | * might now be discovering a truncate that hit on another node. | |
230 | * block_read_full_page->get_block freaks out if it is asked to read | |
231 | * beyond the end of a file, so we check here. Callers | |
232 | * (generic_file_read, fault->nopage) are clever enough to check i_size | |
233 | * and notice that the page they just read isn't needed. | |
234 | * | |
235 | * XXX sys_readahead() seems to get that wrong? | |
236 | */ | |
237 | if (start >= i_size_read(inode)) { | |
238 | char *addr = kmap(page); | |
239 | memset(addr, 0, PAGE_SIZE); | |
240 | flush_dcache_page(page); | |
241 | kunmap(page); | |
242 | SetPageUptodate(page); | |
243 | ret = 0; | |
244 | goto out_alloc; | |
245 | } | |
246 | ||
247 | ret = ocfs2_data_lock_with_page(inode, 0, page); | |
248 | if (ret != 0) { | |
249 | if (ret == AOP_TRUNCATED_PAGE) | |
250 | unlock = 0; | |
251 | mlog_errno(ret); | |
252 | goto out_alloc; | |
253 | } | |
254 | ||
255 | ret = block_read_full_page(page, ocfs2_get_block); | |
256 | unlock = 0; | |
257 | ||
258 | ocfs2_data_unlock(inode, 0); | |
259 | out_alloc: | |
260 | up_read(&OCFS2_I(inode)->ip_alloc_sem); | |
261 | ocfs2_meta_unlock(inode, 0); | |
262 | out: | |
263 | if (unlock) | |
264 | unlock_page(page); | |
265 | mlog_exit(ret); | |
266 | return ret; | |
267 | } | |
268 | ||
269 | /* Note: Because we don't support holes, our allocation has | |
270 | * already happened (allocation writes zeros to the file data) | |
271 | * so we don't have to worry about ordered writes in | |
272 | * ocfs2_writepage. | |
273 | * | |
274 | * ->writepage is called during the process of invalidating the page cache | |
275 | * during blocked lock processing. It can't block on any cluster locks | |
276 | * to during block mapping. It's relying on the fact that the block | |
277 | * mapping can't have disappeared under the dirty pages that it is | |
278 | * being asked to write back. | |
279 | */ | |
280 | static int ocfs2_writepage(struct page *page, struct writeback_control *wbc) | |
281 | { | |
282 | int ret; | |
283 | ||
284 | mlog_entry("(0x%p)\n", page); | |
285 | ||
286 | ret = block_write_full_page(page, ocfs2_get_block, wbc); | |
287 | ||
288 | mlog_exit(ret); | |
289 | ||
290 | return ret; | |
291 | } | |
292 | ||
5069120b MF |
293 | /* |
294 | * This is called from ocfs2_write_zero_page() which has handled it's | |
295 | * own cluster locking and has ensured allocation exists for those | |
296 | * blocks to be written. | |
297 | */ | |
53013cba MF |
298 | int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page, |
299 | unsigned from, unsigned to) | |
300 | { | |
301 | int ret; | |
302 | ||
303 | down_read(&OCFS2_I(inode)->ip_alloc_sem); | |
304 | ||
305 | ret = block_prepare_write(page, from, to, ocfs2_get_block); | |
306 | ||
307 | up_read(&OCFS2_I(inode)->ip_alloc_sem); | |
308 | ||
309 | return ret; | |
310 | } | |
311 | ||
ccd979bd MF |
312 | /* Taken from ext3. We don't necessarily need the full blown |
313 | * functionality yet, but IMHO it's better to cut and paste the whole | |
314 | * thing so we can avoid introducing our own bugs (and easily pick up | |
315 | * their fixes when they happen) --Mark */ | |
60b11392 MF |
316 | int walk_page_buffers( handle_t *handle, |
317 | struct buffer_head *head, | |
318 | unsigned from, | |
319 | unsigned to, | |
320 | int *partial, | |
321 | int (*fn)( handle_t *handle, | |
322 | struct buffer_head *bh)) | |
ccd979bd MF |
323 | { |
324 | struct buffer_head *bh; | |
325 | unsigned block_start, block_end; | |
326 | unsigned blocksize = head->b_size; | |
327 | int err, ret = 0; | |
328 | struct buffer_head *next; | |
329 | ||
330 | for ( bh = head, block_start = 0; | |
331 | ret == 0 && (bh != head || !block_start); | |
332 | block_start = block_end, bh = next) | |
333 | { | |
334 | next = bh->b_this_page; | |
335 | block_end = block_start + blocksize; | |
336 | if (block_end <= from || block_start >= to) { | |
337 | if (partial && !buffer_uptodate(bh)) | |
338 | *partial = 1; | |
339 | continue; | |
340 | } | |
341 | err = (*fn)(handle, bh); | |
342 | if (!ret) | |
343 | ret = err; | |
344 | } | |
345 | return ret; | |
346 | } | |
347 | ||
1fabe148 | 348 | handle_t *ocfs2_start_walk_page_trans(struct inode *inode, |
ccd979bd MF |
349 | struct page *page, |
350 | unsigned from, | |
351 | unsigned to) | |
352 | { | |
353 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1fabe148 | 354 | handle_t *handle = NULL; |
ccd979bd MF |
355 | int ret = 0; |
356 | ||
65eff9cc | 357 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
ccd979bd MF |
358 | if (!handle) { |
359 | ret = -ENOMEM; | |
360 | mlog_errno(ret); | |
361 | goto out; | |
362 | } | |
363 | ||
364 | if (ocfs2_should_order_data(inode)) { | |
1fabe148 | 365 | ret = walk_page_buffers(handle, |
ccd979bd MF |
366 | page_buffers(page), |
367 | from, to, NULL, | |
368 | ocfs2_journal_dirty_data); | |
369 | if (ret < 0) | |
370 | mlog_errno(ret); | |
371 | } | |
372 | out: | |
373 | if (ret) { | |
374 | if (handle) | |
02dc1af4 | 375 | ocfs2_commit_trans(osb, handle); |
ccd979bd MF |
376 | handle = ERR_PTR(ret); |
377 | } | |
378 | return handle; | |
379 | } | |
380 | ||
ccd979bd MF |
381 | static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block) |
382 | { | |
383 | sector_t status; | |
384 | u64 p_blkno = 0; | |
385 | int err = 0; | |
386 | struct inode *inode = mapping->host; | |
387 | ||
388 | mlog_entry("(block = %llu)\n", (unsigned long long)block); | |
389 | ||
390 | /* We don't need to lock journal system files, since they aren't | |
391 | * accessed concurrently from multiple nodes. | |
392 | */ | |
393 | if (!INODE_JOURNAL(inode)) { | |
4bcec184 | 394 | err = ocfs2_meta_lock(inode, NULL, 0); |
ccd979bd MF |
395 | if (err) { |
396 | if (err != -ENOENT) | |
397 | mlog_errno(err); | |
398 | goto bail; | |
399 | } | |
400 | down_read(&OCFS2_I(inode)->ip_alloc_sem); | |
401 | } | |
402 | ||
49cb8d2d | 403 | err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, NULL); |
ccd979bd MF |
404 | |
405 | if (!INODE_JOURNAL(inode)) { | |
406 | up_read(&OCFS2_I(inode)->ip_alloc_sem); | |
407 | ocfs2_meta_unlock(inode, 0); | |
408 | } | |
409 | ||
410 | if (err) { | |
411 | mlog(ML_ERROR, "get_blocks() failed, block = %llu\n", | |
412 | (unsigned long long)block); | |
413 | mlog_errno(err); | |
414 | goto bail; | |
415 | } | |
416 | ||
417 | ||
418 | bail: | |
419 | status = err ? 0 : p_blkno; | |
420 | ||
421 | mlog_exit((int)status); | |
422 | ||
423 | return status; | |
424 | } | |
425 | ||
426 | /* | |
427 | * TODO: Make this into a generic get_blocks function. | |
428 | * | |
429 | * From do_direct_io in direct-io.c: | |
430 | * "So what we do is to permit the ->get_blocks function to populate | |
431 | * bh.b_size with the size of IO which is permitted at this offset and | |
432 | * this i_blkbits." | |
433 | * | |
434 | * This function is called directly from get_more_blocks in direct-io.c. | |
435 | * | |
436 | * called like this: dio->get_blocks(dio->inode, fs_startblk, | |
437 | * fs_count, map_bh, dio->rw == WRITE); | |
438 | */ | |
439 | static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock, | |
ccd979bd MF |
440 | struct buffer_head *bh_result, int create) |
441 | { | |
442 | int ret; | |
4f902c37 | 443 | u64 p_blkno, inode_blocks, contig_blocks; |
49cb8d2d | 444 | unsigned int ext_flags; |
184d7d20 | 445 | unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; |
1d8fa7a2 | 446 | unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
ccd979bd | 447 | |
ccd979bd MF |
448 | /* This function won't even be called if the request isn't all |
449 | * nicely aligned and of the right size, so there's no need | |
450 | * for us to check any of that. */ | |
451 | ||
25baf2da | 452 | inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); |
564f8a32 MF |
453 | |
454 | /* | |
455 | * Any write past EOF is not allowed because we'd be extending. | |
456 | */ | |
457 | if (create && (iblock + max_blocks) > inode_blocks) { | |
ccd979bd MF |
458 | ret = -EIO; |
459 | goto bail; | |
460 | } | |
ccd979bd MF |
461 | |
462 | /* This figures out the size of the next contiguous block, and | |
463 | * our logical offset */ | |
363041a5 | 464 | ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, |
49cb8d2d | 465 | &contig_blocks, &ext_flags); |
ccd979bd MF |
466 | if (ret) { |
467 | mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n", | |
468 | (unsigned long long)iblock); | |
469 | ret = -EIO; | |
470 | goto bail; | |
471 | } | |
472 | ||
25baf2da MF |
473 | if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)) && !p_blkno) { |
474 | ocfs2_error(inode->i_sb, | |
475 | "Inode %llu has a hole at block %llu\n", | |
476 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
477 | (unsigned long long)iblock); | |
478 | ret = -EROFS; | |
479 | goto bail; | |
480 | } | |
481 | ||
482 | /* | |
483 | * get_more_blocks() expects us to describe a hole by clearing | |
484 | * the mapped bit on bh_result(). | |
49cb8d2d MF |
485 | * |
486 | * Consider an unwritten extent as a hole. | |
25baf2da | 487 | */ |
49cb8d2d | 488 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) |
25baf2da MF |
489 | map_bh(bh_result, inode->i_sb, p_blkno); |
490 | else { | |
491 | /* | |
492 | * ocfs2_prepare_inode_for_write() should have caught | |
493 | * the case where we'd be filling a hole and triggered | |
494 | * a buffered write instead. | |
495 | */ | |
496 | if (create) { | |
497 | ret = -EIO; | |
498 | mlog_errno(ret); | |
499 | goto bail; | |
500 | } | |
501 | ||
502 | clear_buffer_mapped(bh_result); | |
503 | } | |
ccd979bd MF |
504 | |
505 | /* make sure we don't map more than max_blocks blocks here as | |
506 | that's all the kernel will handle at this point. */ | |
507 | if (max_blocks < contig_blocks) | |
508 | contig_blocks = max_blocks; | |
509 | bh_result->b_size = contig_blocks << blocksize_bits; | |
510 | bail: | |
511 | return ret; | |
512 | } | |
513 | ||
514 | /* | |
515 | * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're | |
516 | * particularly interested in the aio/dio case. Like the core uses | |
517 | * i_alloc_sem, we use the rw_lock DLM lock to protect io on one node from | |
518 | * truncation on another. | |
519 | */ | |
520 | static void ocfs2_dio_end_io(struct kiocb *iocb, | |
521 | loff_t offset, | |
522 | ssize_t bytes, | |
523 | void *private) | |
524 | { | |
d28c9174 | 525 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
7cdfc3a1 | 526 | int level; |
ccd979bd MF |
527 | |
528 | /* this io's submitter should not have unlocked this before we could */ | |
529 | BUG_ON(!ocfs2_iocb_is_rw_locked(iocb)); | |
7cdfc3a1 | 530 | |
ccd979bd | 531 | ocfs2_iocb_clear_rw_locked(iocb); |
7cdfc3a1 MF |
532 | |
533 | level = ocfs2_iocb_rw_locked_level(iocb); | |
534 | if (!level) | |
535 | up_read(&inode->i_alloc_sem); | |
536 | ocfs2_rw_unlock(inode, level); | |
ccd979bd MF |
537 | } |
538 | ||
03f981cf JB |
539 | /* |
540 | * ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen | |
541 | * from ext3. PageChecked() bits have been removed as OCFS2 does not | |
542 | * do journalled data. | |
543 | */ | |
544 | static void ocfs2_invalidatepage(struct page *page, unsigned long offset) | |
545 | { | |
546 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; | |
547 | ||
548 | journal_invalidatepage(journal, page, offset); | |
549 | } | |
550 | ||
551 | static int ocfs2_releasepage(struct page *page, gfp_t wait) | |
552 | { | |
553 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; | |
554 | ||
555 | if (!page_has_buffers(page)) | |
556 | return 0; | |
557 | return journal_try_to_free_buffers(journal, page, wait); | |
558 | } | |
559 | ||
ccd979bd MF |
560 | static ssize_t ocfs2_direct_IO(int rw, |
561 | struct kiocb *iocb, | |
562 | const struct iovec *iov, | |
563 | loff_t offset, | |
564 | unsigned long nr_segs) | |
565 | { | |
566 | struct file *file = iocb->ki_filp; | |
d28c9174 | 567 | struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host; |
ccd979bd MF |
568 | int ret; |
569 | ||
570 | mlog_entry_void(); | |
53013cba | 571 | |
9517bac6 MF |
572 | if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) { |
573 | /* | |
574 | * We get PR data locks even for O_DIRECT. This | |
575 | * allows concurrent O_DIRECT I/O but doesn't let | |
576 | * O_DIRECT with extending and buffered zeroing writes | |
577 | * race. If they did race then the buffered zeroing | |
578 | * could be written back after the O_DIRECT I/O. It's | |
579 | * one thing to tell people not to mix buffered and | |
580 | * O_DIRECT writes, but expecting them to understand | |
581 | * that file extension is also an implicit buffered | |
582 | * write is too much. By getting the PR we force | |
583 | * writeback of the buffered zeroing before | |
584 | * proceeding. | |
585 | */ | |
586 | ret = ocfs2_data_lock(inode, 0); | |
587 | if (ret < 0) { | |
588 | mlog_errno(ret); | |
589 | goto out; | |
590 | } | |
591 | ocfs2_data_unlock(inode, 0); | |
53013cba | 592 | } |
53013cba | 593 | |
ccd979bd MF |
594 | ret = blockdev_direct_IO_no_locking(rw, iocb, inode, |
595 | inode->i_sb->s_bdev, iov, offset, | |
596 | nr_segs, | |
597 | ocfs2_direct_IO_get_blocks, | |
598 | ocfs2_dio_end_io); | |
53013cba | 599 | out: |
ccd979bd MF |
600 | mlog_exit(ret); |
601 | return ret; | |
602 | } | |
603 | ||
9517bac6 MF |
604 | static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb, |
605 | u32 cpos, | |
606 | unsigned int *start, | |
607 | unsigned int *end) | |
608 | { | |
609 | unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE; | |
610 | ||
611 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) { | |
612 | unsigned int cpp; | |
613 | ||
614 | cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits); | |
615 | ||
616 | cluster_start = cpos % cpp; | |
617 | cluster_start = cluster_start << osb->s_clustersize_bits; | |
618 | ||
619 | cluster_end = cluster_start + osb->s_clustersize; | |
620 | } | |
621 | ||
622 | BUG_ON(cluster_start > PAGE_SIZE); | |
623 | BUG_ON(cluster_end > PAGE_SIZE); | |
624 | ||
625 | if (start) | |
626 | *start = cluster_start; | |
627 | if (end) | |
628 | *end = cluster_end; | |
629 | } | |
630 | ||
631 | /* | |
632 | * 'from' and 'to' are the region in the page to avoid zeroing. | |
633 | * | |
634 | * If pagesize > clustersize, this function will avoid zeroing outside | |
635 | * of the cluster boundary. | |
636 | * | |
637 | * from == to == 0 is code for "zero the entire cluster region" | |
638 | */ | |
639 | static void ocfs2_clear_page_regions(struct page *page, | |
640 | struct ocfs2_super *osb, u32 cpos, | |
641 | unsigned from, unsigned to) | |
642 | { | |
643 | void *kaddr; | |
644 | unsigned int cluster_start, cluster_end; | |
645 | ||
646 | ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end); | |
647 | ||
648 | kaddr = kmap_atomic(page, KM_USER0); | |
649 | ||
650 | if (from || to) { | |
651 | if (from > cluster_start) | |
652 | memset(kaddr + cluster_start, 0, from - cluster_start); | |
653 | if (to < cluster_end) | |
654 | memset(kaddr + to, 0, cluster_end - to); | |
655 | } else { | |
656 | memset(kaddr + cluster_start, 0, cluster_end - cluster_start); | |
657 | } | |
658 | ||
659 | kunmap_atomic(kaddr, KM_USER0); | |
660 | } | |
661 | ||
662 | /* | |
663 | * Some of this taken from block_prepare_write(). We already have our | |
664 | * mapping by now though, and the entire write will be allocating or | |
665 | * it won't, so not much need to use BH_New. | |
666 | * | |
667 | * This will also skip zeroing, which is handled externally. | |
668 | */ | |
60b11392 MF |
669 | int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno, |
670 | struct inode *inode, unsigned int from, | |
671 | unsigned int to, int new) | |
9517bac6 MF |
672 | { |
673 | int ret = 0; | |
674 | struct buffer_head *head, *bh, *wait[2], **wait_bh = wait; | |
675 | unsigned int block_end, block_start; | |
676 | unsigned int bsize = 1 << inode->i_blkbits; | |
677 | ||
678 | if (!page_has_buffers(page)) | |
679 | create_empty_buffers(page, bsize, 0); | |
680 | ||
681 | head = page_buffers(page); | |
682 | for (bh = head, block_start = 0; bh != head || !block_start; | |
683 | bh = bh->b_this_page, block_start += bsize) { | |
684 | block_end = block_start + bsize; | |
685 | ||
686 | /* | |
687 | * Ignore blocks outside of our i/o range - | |
688 | * they may belong to unallocated clusters. | |
689 | */ | |
60b11392 | 690 | if (block_start >= to || block_end <= from) { |
9517bac6 MF |
691 | if (PageUptodate(page)) |
692 | set_buffer_uptodate(bh); | |
693 | continue; | |
694 | } | |
695 | ||
696 | /* | |
697 | * For an allocating write with cluster size >= page | |
698 | * size, we always write the entire page. | |
699 | */ | |
700 | ||
701 | if (buffer_new(bh)) | |
702 | clear_buffer_new(bh); | |
703 | ||
704 | if (!buffer_mapped(bh)) { | |
705 | map_bh(bh, inode->i_sb, *p_blkno); | |
706 | unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); | |
707 | } | |
708 | ||
709 | if (PageUptodate(page)) { | |
710 | if (!buffer_uptodate(bh)) | |
711 | set_buffer_uptodate(bh); | |
712 | } else if (!buffer_uptodate(bh) && !buffer_delay(bh) && | |
713 | (block_start < from || block_end > to)) { | |
714 | ll_rw_block(READ, 1, &bh); | |
715 | *wait_bh++=bh; | |
716 | } | |
717 | ||
718 | *p_blkno = *p_blkno + 1; | |
719 | } | |
720 | ||
721 | /* | |
722 | * If we issued read requests - let them complete. | |
723 | */ | |
724 | while(wait_bh > wait) { | |
725 | wait_on_buffer(*--wait_bh); | |
726 | if (!buffer_uptodate(*wait_bh)) | |
727 | ret = -EIO; | |
728 | } | |
729 | ||
730 | if (ret == 0 || !new) | |
731 | return ret; | |
732 | ||
733 | /* | |
734 | * If we get -EIO above, zero out any newly allocated blocks | |
735 | * to avoid exposing stale data. | |
736 | */ | |
737 | bh = head; | |
738 | block_start = 0; | |
739 | do { | |
740 | void *kaddr; | |
741 | ||
742 | block_end = block_start + bsize; | |
743 | if (block_end <= from) | |
744 | goto next_bh; | |
745 | if (block_start >= to) | |
746 | break; | |
747 | ||
748 | kaddr = kmap_atomic(page, KM_USER0); | |
749 | memset(kaddr+block_start, 0, bh->b_size); | |
750 | flush_dcache_page(page); | |
751 | kunmap_atomic(kaddr, KM_USER0); | |
752 | set_buffer_uptodate(bh); | |
753 | mark_buffer_dirty(bh); | |
754 | ||
755 | next_bh: | |
756 | block_start = block_end; | |
757 | bh = bh->b_this_page; | |
758 | } while (bh != head); | |
759 | ||
760 | return ret; | |
761 | } | |
762 | ||
6af67d82 MF |
763 | /* |
764 | * This will copy user data from the buffer page in the splice | |
765 | * context. | |
766 | * | |
767 | * For now, we ignore SPLICE_F_MOVE as that would require some extra | |
768 | * communication out all the way to ocfs2_write(). | |
769 | */ | |
770 | int ocfs2_map_and_write_splice_data(struct inode *inode, | |
771 | struct ocfs2_write_ctxt *wc, u64 *p_blkno, | |
772 | unsigned int *ret_from, unsigned int *ret_to) | |
773 | { | |
774 | int ret; | |
775 | unsigned int to, from, cluster_start, cluster_end; | |
776 | char *src, *dst; | |
777 | struct ocfs2_splice_write_priv *sp = wc->w_private; | |
778 | struct pipe_buffer *buf = sp->s_buf; | |
779 | unsigned long bytes, src_from; | |
780 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
781 | ||
782 | ocfs2_figure_cluster_boundaries(osb, wc->w_cpos, &cluster_start, | |
783 | &cluster_end); | |
784 | ||
785 | from = sp->s_offset; | |
786 | src_from = sp->s_buf_offset; | |
787 | bytes = wc->w_count; | |
788 | ||
789 | if (wc->w_large_pages) { | |
790 | /* | |
791 | * For cluster size < page size, we have to | |
792 | * calculate pos within the cluster and obey | |
793 | * the rightmost boundary. | |
794 | */ | |
795 | bytes = min(bytes, (unsigned long)(osb->s_clustersize | |
796 | - (wc->w_pos & (osb->s_clustersize - 1)))); | |
797 | } | |
798 | to = from + bytes; | |
799 | ||
800 | if (wc->w_this_page_new) | |
801 | ret = ocfs2_map_page_blocks(wc->w_this_page, p_blkno, inode, | |
802 | cluster_start, cluster_end, 1); | |
803 | else | |
804 | ret = ocfs2_map_page_blocks(wc->w_this_page, p_blkno, inode, | |
805 | from, to, 0); | |
806 | if (ret) { | |
807 | mlog_errno(ret); | |
808 | goto out; | |
809 | } | |
810 | ||
811 | BUG_ON(from > PAGE_CACHE_SIZE); | |
812 | BUG_ON(to > PAGE_CACHE_SIZE); | |
813 | BUG_ON(from > osb->s_clustersize); | |
814 | BUG_ON(to > osb->s_clustersize); | |
815 | ||
816 | src = buf->ops->map(sp->s_pipe, buf, 1); | |
817 | dst = kmap_atomic(wc->w_this_page, KM_USER1); | |
818 | memcpy(dst + from, src + src_from, bytes); | |
819 | kunmap_atomic(wc->w_this_page, KM_USER1); | |
820 | buf->ops->unmap(sp->s_pipe, buf, src); | |
821 | ||
822 | wc->w_finished_copy = 1; | |
823 | ||
824 | *ret_from = from; | |
825 | *ret_to = to; | |
826 | out: | |
827 | ||
828 | return bytes ? (unsigned int)bytes : ret; | |
829 | } | |
830 | ||
9517bac6 MF |
831 | /* |
832 | * This will copy user data from the iovec in the buffered write | |
833 | * context. | |
834 | */ | |
835 | int ocfs2_map_and_write_user_data(struct inode *inode, | |
836 | struct ocfs2_write_ctxt *wc, u64 *p_blkno, | |
837 | unsigned int *ret_from, unsigned int *ret_to) | |
838 | { | |
839 | int ret; | |
840 | unsigned int to, from, cluster_start, cluster_end; | |
841 | unsigned long bytes, src_from; | |
842 | char *dst; | |
843 | struct ocfs2_buffered_write_priv *bp = wc->w_private; | |
844 | const struct iovec *cur_iov = bp->b_cur_iov; | |
845 | char __user *buf; | |
846 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
847 | ||
848 | ocfs2_figure_cluster_boundaries(osb, wc->w_cpos, &cluster_start, | |
849 | &cluster_end); | |
850 | ||
851 | buf = cur_iov->iov_base + bp->b_cur_off; | |
852 | src_from = (unsigned long)buf & ~PAGE_CACHE_MASK; | |
853 | ||
854 | from = wc->w_pos & (PAGE_CACHE_SIZE - 1); | |
855 | ||
856 | /* | |
857 | * This is a lot of comparisons, but it reads quite | |
858 | * easily, which is important here. | |
859 | */ | |
860 | /* Stay within the src page */ | |
861 | bytes = PAGE_SIZE - src_from; | |
862 | /* Stay within the vector */ | |
863 | bytes = min(bytes, | |
864 | (unsigned long)(cur_iov->iov_len - bp->b_cur_off)); | |
865 | /* Stay within count */ | |
866 | bytes = min(bytes, (unsigned long)wc->w_count); | |
867 | /* | |
868 | * For clustersize > page size, just stay within | |
869 | * target page, otherwise we have to calculate pos | |
870 | * within the cluster and obey the rightmost | |
871 | * boundary. | |
872 | */ | |
873 | if (wc->w_large_pages) { | |
874 | /* | |
875 | * For cluster size < page size, we have to | |
876 | * calculate pos within the cluster and obey | |
877 | * the rightmost boundary. | |
878 | */ | |
879 | bytes = min(bytes, (unsigned long)(osb->s_clustersize | |
880 | - (wc->w_pos & (osb->s_clustersize - 1)))); | |
881 | } else { | |
882 | /* | |
883 | * cluster size > page size is the most common | |
884 | * case - we just stay within the target page | |
885 | * boundary. | |
886 | */ | |
887 | bytes = min(bytes, PAGE_CACHE_SIZE - from); | |
888 | } | |
889 | ||
890 | to = from + bytes; | |
891 | ||
892 | if (wc->w_this_page_new) | |
893 | ret = ocfs2_map_page_blocks(wc->w_this_page, p_blkno, inode, | |
894 | cluster_start, cluster_end, 1); | |
895 | else | |
896 | ret = ocfs2_map_page_blocks(wc->w_this_page, p_blkno, inode, | |
897 | from, to, 0); | |
898 | if (ret) { | |
899 | mlog_errno(ret); | |
900 | goto out; | |
901 | } | |
902 | ||
903 | BUG_ON(from > PAGE_CACHE_SIZE); | |
904 | BUG_ON(to > PAGE_CACHE_SIZE); | |
905 | BUG_ON(from > osb->s_clustersize); | |
906 | BUG_ON(to > osb->s_clustersize); | |
907 | ||
908 | dst = kmap(wc->w_this_page); | |
909 | memcpy(dst + from, bp->b_src_buf + src_from, bytes); | |
910 | kunmap(wc->w_this_page); | |
911 | ||
912 | /* | |
913 | * XXX: This is slow, but simple. The caller of | |
914 | * ocfs2_buffered_write_cluster() is responsible for | |
915 | * passing through the iovecs, so it's difficult to | |
916 | * predict what our next step is in here after our | |
917 | * initial write. A future version should be pushing | |
918 | * that iovec manipulation further down. | |
919 | * | |
920 | * By setting this, we indicate that a copy from user | |
921 | * data was done, and subsequent calls for this | |
922 | * cluster will skip copying more data. | |
923 | */ | |
924 | wc->w_finished_copy = 1; | |
925 | ||
926 | *ret_from = from; | |
927 | *ret_to = to; | |
928 | out: | |
929 | ||
930 | return bytes ? (unsigned int)bytes : ret; | |
931 | } | |
932 | ||
933 | /* | |
934 | * Map, fill and write a page to disk. | |
935 | * | |
936 | * The work of copying data is done via callback. Newly allocated | |
937 | * pages which don't take user data will be zero'd (set 'new' to | |
938 | * indicate an allocating write) | |
939 | * | |
940 | * Returns a negative error code or the number of bytes copied into | |
941 | * the page. | |
942 | */ | |
6cb129f5 AB |
943 | static int ocfs2_write_data_page(struct inode *inode, handle_t *handle, |
944 | u64 *p_blkno, struct page *page, | |
945 | struct ocfs2_write_ctxt *wc, int new) | |
9517bac6 MF |
946 | { |
947 | int ret, copied = 0; | |
948 | unsigned int from = 0, to = 0; | |
949 | unsigned int cluster_start, cluster_end; | |
950 | unsigned int zero_from = 0, zero_to = 0; | |
951 | ||
952 | ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), wc->w_cpos, | |
953 | &cluster_start, &cluster_end); | |
954 | ||
955 | if ((wc->w_pos >> PAGE_CACHE_SHIFT) == page->index | |
956 | && !wc->w_finished_copy) { | |
957 | ||
958 | wc->w_this_page = page; | |
959 | wc->w_this_page_new = new; | |
960 | ret = wc->w_write_data_page(inode, wc, p_blkno, &from, &to); | |
961 | if (ret < 0) { | |
962 | mlog_errno(ret); | |
963 | goto out; | |
964 | } | |
965 | ||
966 | copied = ret; | |
967 | ||
968 | zero_from = from; | |
969 | zero_to = to; | |
970 | if (new) { | |
971 | from = cluster_start; | |
972 | to = cluster_end; | |
973 | } | |
974 | } else { | |
975 | /* | |
976 | * If we haven't allocated the new page yet, we | |
977 | * shouldn't be writing it out without copying user | |
978 | * data. This is likely a math error from the caller. | |
979 | */ | |
980 | BUG_ON(!new); | |
981 | ||
982 | from = cluster_start; | |
983 | to = cluster_end; | |
984 | ||
985 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, | |
986 | cluster_start, cluster_end, 1); | |
987 | if (ret) { | |
988 | mlog_errno(ret); | |
989 | goto out; | |
990 | } | |
991 | } | |
992 | ||
993 | /* | |
994 | * Parts of newly allocated pages need to be zero'd. | |
995 | * | |
996 | * Above, we have also rewritten 'to' and 'from' - as far as | |
997 | * the rest of the function is concerned, the entire cluster | |
998 | * range inside of a page needs to be written. | |
999 | * | |
1000 | * We can skip this if the page is up to date - it's already | |
1001 | * been zero'd from being read in as a hole. | |
1002 | */ | |
1003 | if (new && !PageUptodate(page)) | |
1004 | ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb), | |
1005 | wc->w_cpos, zero_from, zero_to); | |
1006 | ||
1007 | flush_dcache_page(page); | |
1008 | ||
1009 | if (ocfs2_should_order_data(inode)) { | |
1010 | ret = walk_page_buffers(handle, | |
1011 | page_buffers(page), | |
1012 | from, to, NULL, | |
1013 | ocfs2_journal_dirty_data); | |
1014 | if (ret < 0) | |
1015 | mlog_errno(ret); | |
1016 | } | |
1017 | ||
1018 | /* | |
1019 | * We don't use generic_commit_write() because we need to | |
1020 | * handle our own i_size update. | |
1021 | */ | |
1022 | ret = block_commit_write(page, from, to); | |
1023 | if (ret) | |
1024 | mlog_errno(ret); | |
1025 | out: | |
1026 | ||
1027 | return copied ? copied : ret; | |
1028 | } | |
1029 | ||
1030 | /* | |
1031 | * Do the actual write of some data into an inode. Optionally allocate | |
1032 | * in order to fulfill the write. | |
1033 | * | |
1034 | * cpos is the logical cluster offset within the file to write at | |
1035 | * | |
1036 | * 'phys' is the physical mapping of that offset. a 'phys' value of | |
1037 | * zero indicates that allocation is required. In this case, data_ac | |
1038 | * and meta_ac should be valid (meta_ac can be null if metadata | |
1039 | * allocation isn't required). | |
1040 | */ | |
1041 | static ssize_t ocfs2_write(struct file *file, u32 phys, handle_t *handle, | |
1042 | struct buffer_head *di_bh, | |
1043 | struct ocfs2_alloc_context *data_ac, | |
1044 | struct ocfs2_alloc_context *meta_ac, | |
1045 | struct ocfs2_write_ctxt *wc) | |
1046 | { | |
1047 | int ret, i, numpages = 1, new; | |
1048 | unsigned int copied = 0; | |
1049 | u32 tmp_pos; | |
1050 | u64 v_blkno, p_blkno; | |
1051 | struct address_space *mapping = file->f_mapping; | |
1052 | struct inode *inode = mapping->host; | |
9517bac6 MF |
1053 | unsigned long index, start; |
1054 | struct page **cpages; | |
1055 | ||
1056 | new = phys == 0 ? 1 : 0; | |
1057 | ||
1058 | /* | |
1059 | * Figure out how many pages we'll be manipulating here. For | |
60b11392 MF |
1060 | * non allocating write, we just change the one |
1061 | * page. Otherwise, we'll need a whole clusters worth. | |
9517bac6 | 1062 | */ |
60b11392 MF |
1063 | if (new) |
1064 | numpages = ocfs2_pages_per_cluster(inode->i_sb); | |
9517bac6 MF |
1065 | |
1066 | cpages = kzalloc(sizeof(*cpages) * numpages, GFP_NOFS); | |
1067 | if (!cpages) { | |
1068 | ret = -ENOMEM; | |
1069 | mlog_errno(ret); | |
1070 | return ret; | |
1071 | } | |
1072 | ||
1073 | /* | |
1074 | * Fill our page array first. That way we've grabbed enough so | |
1075 | * that we can zero and flush if we error after adding the | |
1076 | * extent. | |
1077 | */ | |
1078 | if (new) { | |
1079 | start = ocfs2_align_clusters_to_page_index(inode->i_sb, | |
1080 | wc->w_cpos); | |
1081 | v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, wc->w_cpos); | |
1082 | } else { | |
1083 | start = wc->w_pos >> PAGE_CACHE_SHIFT; | |
1084 | v_blkno = wc->w_pos >> inode->i_sb->s_blocksize_bits; | |
1085 | } | |
1086 | ||
1087 | for(i = 0; i < numpages; i++) { | |
1088 | index = start + i; | |
1089 | ||
9315f130 | 1090 | cpages[i] = find_or_create_page(mapping, index, GFP_NOFS); |
9517bac6 MF |
1091 | if (!cpages[i]) { |
1092 | ret = -ENOMEM; | |
1093 | mlog_errno(ret); | |
1094 | goto out; | |
1095 | } | |
1096 | } | |
1097 | ||
1098 | if (new) { | |
1099 | /* | |
1100 | * This is safe to call with the page locks - it won't take | |
1101 | * any additional semaphores or cluster locks. | |
1102 | */ | |
1103 | tmp_pos = wc->w_cpos; | |
1104 | ret = ocfs2_do_extend_allocation(OCFS2_SB(inode->i_sb), inode, | |
1105 | &tmp_pos, 1, di_bh, handle, | |
1106 | data_ac, meta_ac, NULL); | |
1107 | /* | |
1108 | * This shouldn't happen because we must have already | |
1109 | * calculated the correct meta data allocation required. The | |
1110 | * internal tree allocation code should know how to increase | |
1111 | * transaction credits itself. | |
1112 | * | |
1113 | * If need be, we could handle -EAGAIN for a | |
1114 | * RESTART_TRANS here. | |
1115 | */ | |
1116 | mlog_bug_on_msg(ret == -EAGAIN, | |
1117 | "Inode %llu: EAGAIN return during allocation.\n", | |
1118 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1119 | if (ret < 0) { | |
1120 | mlog_errno(ret); | |
1121 | goto out; | |
1122 | } | |
1123 | } | |
1124 | ||
49cb8d2d MF |
1125 | ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL, |
1126 | NULL); | |
9517bac6 MF |
1127 | if (ret < 0) { |
1128 | ||
1129 | /* | |
1130 | * XXX: Should we go readonly here? | |
1131 | */ | |
1132 | ||
1133 | mlog_errno(ret); | |
1134 | goto out; | |
1135 | } | |
1136 | ||
1137 | BUG_ON(p_blkno == 0); | |
1138 | ||
1139 | for(i = 0; i < numpages; i++) { | |
1140 | ret = ocfs2_write_data_page(inode, handle, &p_blkno, cpages[i], | |
1141 | wc, new); | |
1142 | if (ret < 0) { | |
1143 | mlog_errno(ret); | |
1144 | goto out; | |
1145 | } | |
1146 | ||
1147 | copied += ret; | |
1148 | } | |
1149 | ||
1150 | out: | |
1151 | for(i = 0; i < numpages; i++) { | |
1152 | unlock_page(cpages[i]); | |
1153 | mark_page_accessed(cpages[i]); | |
1154 | page_cache_release(cpages[i]); | |
1155 | } | |
1156 | kfree(cpages); | |
1157 | ||
1158 | return copied ? copied : ret; | |
1159 | } | |
1160 | ||
1161 | static void ocfs2_write_ctxt_init(struct ocfs2_write_ctxt *wc, | |
1162 | struct ocfs2_super *osb, loff_t pos, | |
1163 | size_t count, ocfs2_page_writer *cb, | |
1164 | void *cb_priv) | |
1165 | { | |
1166 | wc->w_count = count; | |
1167 | wc->w_pos = pos; | |
1168 | wc->w_cpos = wc->w_pos >> osb->s_clustersize_bits; | |
1169 | wc->w_finished_copy = 0; | |
1170 | ||
1171 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) | |
1172 | wc->w_large_pages = 1; | |
1173 | else | |
1174 | wc->w_large_pages = 0; | |
1175 | ||
1176 | wc->w_write_data_page = cb; | |
1177 | wc->w_private = cb_priv; | |
1178 | } | |
1179 | ||
1180 | /* | |
1181 | * Write a cluster to an inode. The cluster may not be allocated yet, | |
1182 | * in which case it will be. This only exists for buffered writes - | |
1183 | * O_DIRECT takes a more "traditional" path through the kernel. | |
1184 | * | |
1185 | * The caller is responsible for incrementing pos, written counts, etc | |
1186 | * | |
1187 | * For file systems that don't support sparse files, pre-allocation | |
1188 | * and page zeroing up until cpos should be done prior to this | |
1189 | * function call. | |
1190 | * | |
1191 | * Callers should be holding i_sem, and the rw cluster lock. | |
1192 | * | |
1193 | * Returns the number of user bytes written, or less than zero for | |
1194 | * error. | |
1195 | */ | |
1196 | ssize_t ocfs2_buffered_write_cluster(struct file *file, loff_t pos, | |
1197 | size_t count, ocfs2_page_writer *actor, | |
1198 | void *priv) | |
1199 | { | |
1200 | int ret, credits = OCFS2_INODE_UPDATE_CREDITS; | |
1201 | ssize_t written = 0; | |
1202 | u32 phys; | |
1203 | struct inode *inode = file->f_mapping->host; | |
1204 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1205 | struct buffer_head *di_bh = NULL; | |
1206 | struct ocfs2_dinode *di; | |
1207 | struct ocfs2_alloc_context *data_ac = NULL; | |
1208 | struct ocfs2_alloc_context *meta_ac = NULL; | |
1209 | handle_t *handle; | |
1210 | struct ocfs2_write_ctxt wc; | |
1211 | ||
1212 | ocfs2_write_ctxt_init(&wc, osb, pos, count, actor, priv); | |
1213 | ||
1214 | ret = ocfs2_meta_lock(inode, &di_bh, 1); | |
1215 | if (ret) { | |
1216 | mlog_errno(ret); | |
1217 | goto out; | |
1218 | } | |
1219 | di = (struct ocfs2_dinode *)di_bh->b_data; | |
1220 | ||
1221 | /* | |
1222 | * Take alloc sem here to prevent concurrent lookups. That way | |
1223 | * the mapping, zeroing and tree manipulation within | |
1224 | * ocfs2_write() will be safe against ->readpage(). This | |
1225 | * should also serve to lock out allocation from a shared | |
1226 | * writeable region. | |
1227 | */ | |
1228 | down_write(&OCFS2_I(inode)->ip_alloc_sem); | |
1229 | ||
49cb8d2d | 1230 | ret = ocfs2_get_clusters(inode, wc.w_cpos, &phys, NULL, NULL); |
9517bac6 MF |
1231 | if (ret) { |
1232 | mlog_errno(ret); | |
1233 | goto out_meta; | |
1234 | } | |
1235 | ||
1236 | /* phys == 0 means that allocation is required. */ | |
1237 | if (phys == 0) { | |
1238 | ret = ocfs2_lock_allocators(inode, di, 1, &data_ac, &meta_ac); | |
1239 | if (ret) { | |
1240 | mlog_errno(ret); | |
1241 | goto out_meta; | |
1242 | } | |
1243 | ||
1244 | credits = ocfs2_calc_extend_credits(inode->i_sb, di, 1); | |
1245 | } | |
1246 | ||
1247 | ret = ocfs2_data_lock(inode, 1); | |
1248 | if (ret) { | |
1249 | mlog_errno(ret); | |
1250 | goto out_meta; | |
1251 | } | |
1252 | ||
1253 | handle = ocfs2_start_trans(osb, credits); | |
1254 | if (IS_ERR(handle)) { | |
1255 | ret = PTR_ERR(handle); | |
1256 | mlog_errno(ret); | |
1257 | goto out_data; | |
1258 | } | |
1259 | ||
1260 | written = ocfs2_write(file, phys, handle, di_bh, data_ac, | |
1261 | meta_ac, &wc); | |
1262 | if (written < 0) { | |
1263 | ret = written; | |
1264 | mlog_errno(ret); | |
1265 | goto out_commit; | |
1266 | } | |
1267 | ||
1268 | ret = ocfs2_journal_access(handle, inode, di_bh, | |
1269 | OCFS2_JOURNAL_ACCESS_WRITE); | |
1270 | if (ret) { | |
1271 | mlog_errno(ret); | |
1272 | goto out_commit; | |
1273 | } | |
1274 | ||
1275 | pos += written; | |
1276 | if (pos > inode->i_size) { | |
1277 | i_size_write(inode, pos); | |
1278 | mark_inode_dirty(inode); | |
1279 | } | |
8110b073 | 1280 | inode->i_blocks = ocfs2_inode_sector_count(inode); |
9517bac6 MF |
1281 | di->i_size = cpu_to_le64((u64)i_size_read(inode)); |
1282 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
1283 | di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec); | |
1284 | di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); | |
1285 | ||
1286 | ret = ocfs2_journal_dirty(handle, di_bh); | |
1287 | if (ret) | |
1288 | mlog_errno(ret); | |
1289 | ||
1290 | out_commit: | |
1291 | ocfs2_commit_trans(osb, handle); | |
1292 | ||
1293 | out_data: | |
1294 | ocfs2_data_unlock(inode, 1); | |
1295 | ||
1296 | out_meta: | |
1297 | up_write(&OCFS2_I(inode)->ip_alloc_sem); | |
1298 | ocfs2_meta_unlock(inode, 1); | |
1299 | ||
1300 | out: | |
1301 | brelse(di_bh); | |
1302 | if (data_ac) | |
1303 | ocfs2_free_alloc_context(data_ac); | |
1304 | if (meta_ac) | |
1305 | ocfs2_free_alloc_context(meta_ac); | |
1306 | ||
1307 | return written ? written : ret; | |
1308 | } | |
1309 | ||
f5e54d6e | 1310 | const struct address_space_operations ocfs2_aops = { |
ccd979bd MF |
1311 | .readpage = ocfs2_readpage, |
1312 | .writepage = ocfs2_writepage, | |
ccd979bd MF |
1313 | .bmap = ocfs2_bmap, |
1314 | .sync_page = block_sync_page, | |
03f981cf JB |
1315 | .direct_IO = ocfs2_direct_IO, |
1316 | .invalidatepage = ocfs2_invalidatepage, | |
1317 | .releasepage = ocfs2_releasepage, | |
1318 | .migratepage = buffer_migrate_page, | |
ccd979bd | 1319 | }; |