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ccd979bd MF |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * file.c | |
5 | * | |
6 | * File open, close, extend, truncate | |
7 | * | |
8 | * Copyright (C) 2002, 2004 Oracle. All rights reserved. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public | |
12 | * License as published by the Free Software Foundation; either | |
13 | * version 2 of the License, or (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public | |
21 | * License along with this program; if not, write to the | |
22 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | * Boston, MA 021110-1307, USA. | |
24 | */ | |
25 | ||
16f7e0fe | 26 | #include <linux/capability.h> |
ccd979bd MF |
27 | #include <linux/fs.h> |
28 | #include <linux/types.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/highmem.h> | |
31 | #include <linux/pagemap.h> | |
32 | #include <linux/uio.h> | |
e2057c5a | 33 | #include <linux/sched.h> |
8659ac25 | 34 | #include <linux/pipe_fs_i.h> |
7f1a37e3 | 35 | #include <linux/mount.h> |
9517bac6 | 36 | #include <linux/writeback.h> |
ccd979bd MF |
37 | |
38 | #define MLOG_MASK_PREFIX ML_INODE | |
39 | #include <cluster/masklog.h> | |
40 | ||
41 | #include "ocfs2.h" | |
42 | ||
43 | #include "alloc.h" | |
44 | #include "aops.h" | |
45 | #include "dir.h" | |
46 | #include "dlmglue.h" | |
47 | #include "extent_map.h" | |
48 | #include "file.h" | |
49 | #include "sysfile.h" | |
50 | #include "inode.h" | |
ca4d147e | 51 | #include "ioctl.h" |
ccd979bd MF |
52 | #include "journal.h" |
53 | #include "mmap.h" | |
54 | #include "suballoc.h" | |
55 | #include "super.h" | |
56 | ||
57 | #include "buffer_head_io.h" | |
58 | ||
59 | static int ocfs2_sync_inode(struct inode *inode) | |
60 | { | |
61 | filemap_fdatawrite(inode->i_mapping); | |
62 | return sync_mapping_buffers(inode->i_mapping); | |
63 | } | |
64 | ||
65 | static int ocfs2_file_open(struct inode *inode, struct file *file) | |
66 | { | |
67 | int status; | |
68 | int mode = file->f_flags; | |
69 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
70 | ||
71 | mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file, | |
d28c9174 | 72 | file->f_path.dentry->d_name.len, file->f_path.dentry->d_name.name); |
ccd979bd MF |
73 | |
74 | spin_lock(&oi->ip_lock); | |
75 | ||
76 | /* Check that the inode hasn't been wiped from disk by another | |
77 | * node. If it hasn't then we're safe as long as we hold the | |
78 | * spin lock until our increment of open count. */ | |
79 | if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) { | |
80 | spin_unlock(&oi->ip_lock); | |
81 | ||
82 | status = -ENOENT; | |
83 | goto leave; | |
84 | } | |
85 | ||
86 | if (mode & O_DIRECT) | |
87 | oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT; | |
88 | ||
89 | oi->ip_open_count++; | |
90 | spin_unlock(&oi->ip_lock); | |
91 | status = 0; | |
92 | leave: | |
93 | mlog_exit(status); | |
94 | return status; | |
95 | } | |
96 | ||
97 | static int ocfs2_file_release(struct inode *inode, struct file *file) | |
98 | { | |
99 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
100 | ||
101 | mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file, | |
d28c9174 JS |
102 | file->f_path.dentry->d_name.len, |
103 | file->f_path.dentry->d_name.name); | |
ccd979bd MF |
104 | |
105 | spin_lock(&oi->ip_lock); | |
106 | if (!--oi->ip_open_count) | |
107 | oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT; | |
108 | spin_unlock(&oi->ip_lock); | |
109 | ||
110 | mlog_exit(0); | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | static int ocfs2_sync_file(struct file *file, | |
116 | struct dentry *dentry, | |
117 | int datasync) | |
118 | { | |
119 | int err = 0; | |
120 | journal_t *journal; | |
121 | struct inode *inode = dentry->d_inode; | |
122 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
123 | ||
124 | mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file, dentry, datasync, | |
125 | dentry->d_name.len, dentry->d_name.name); | |
126 | ||
127 | err = ocfs2_sync_inode(dentry->d_inode); | |
128 | if (err) | |
129 | goto bail; | |
130 | ||
131 | journal = osb->journal->j_journal; | |
132 | err = journal_force_commit(journal); | |
133 | ||
134 | bail: | |
135 | mlog_exit(err); | |
136 | ||
137 | return (err < 0) ? -EIO : 0; | |
138 | } | |
139 | ||
7f1a37e3 TY |
140 | int ocfs2_should_update_atime(struct inode *inode, |
141 | struct vfsmount *vfsmnt) | |
142 | { | |
143 | struct timespec now; | |
144 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
145 | ||
146 | if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) | |
147 | return 0; | |
148 | ||
149 | if ((inode->i_flags & S_NOATIME) || | |
150 | ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode))) | |
151 | return 0; | |
152 | ||
6c2aad05 MF |
153 | /* |
154 | * We can be called with no vfsmnt structure - NFSD will | |
155 | * sometimes do this. | |
156 | * | |
157 | * Note that our action here is different than touch_atime() - | |
158 | * if we can't tell whether this is a noatime mount, then we | |
159 | * don't know whether to trust the value of s_atime_quantum. | |
160 | */ | |
161 | if (vfsmnt == NULL) | |
162 | return 0; | |
163 | ||
7f1a37e3 TY |
164 | if ((vfsmnt->mnt_flags & MNT_NOATIME) || |
165 | ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) | |
166 | return 0; | |
167 | ||
7e913c53 MF |
168 | if (vfsmnt->mnt_flags & MNT_RELATIME) { |
169 | if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) || | |
170 | (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0)) | |
171 | return 1; | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
7f1a37e3 TY |
176 | now = CURRENT_TIME; |
177 | if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum)) | |
178 | return 0; | |
179 | else | |
180 | return 1; | |
181 | } | |
182 | ||
183 | int ocfs2_update_inode_atime(struct inode *inode, | |
184 | struct buffer_head *bh) | |
185 | { | |
186 | int ret; | |
187 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
188 | handle_t *handle; | |
189 | ||
190 | mlog_entry_void(); | |
191 | ||
192 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); | |
193 | if (handle == NULL) { | |
194 | ret = -ENOMEM; | |
195 | mlog_errno(ret); | |
196 | goto out; | |
197 | } | |
198 | ||
199 | inode->i_atime = CURRENT_TIME; | |
200 | ret = ocfs2_mark_inode_dirty(handle, inode, bh); | |
201 | if (ret < 0) | |
202 | mlog_errno(ret); | |
203 | ||
204 | ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); | |
205 | out: | |
206 | mlog_exit(ret); | |
207 | return ret; | |
208 | } | |
209 | ||
6cb129f5 AB |
210 | static int ocfs2_set_inode_size(handle_t *handle, |
211 | struct inode *inode, | |
212 | struct buffer_head *fe_bh, | |
213 | u64 new_i_size) | |
ccd979bd MF |
214 | { |
215 | int status; | |
216 | ||
217 | mlog_entry_void(); | |
218 | i_size_write(inode, new_i_size); | |
8110b073 | 219 | inode->i_blocks = ocfs2_inode_sector_count(inode); |
ccd979bd MF |
220 | inode->i_ctime = inode->i_mtime = CURRENT_TIME; |
221 | ||
222 | status = ocfs2_mark_inode_dirty(handle, inode, fe_bh); | |
223 | if (status < 0) { | |
224 | mlog_errno(status); | |
225 | goto bail; | |
226 | } | |
227 | ||
228 | bail: | |
229 | mlog_exit(status); | |
230 | return status; | |
231 | } | |
232 | ||
233 | static int ocfs2_simple_size_update(struct inode *inode, | |
234 | struct buffer_head *di_bh, | |
235 | u64 new_i_size) | |
236 | { | |
237 | int ret; | |
238 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1fabe148 | 239 | handle_t *handle = NULL; |
ccd979bd | 240 | |
65eff9cc | 241 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
ccd979bd MF |
242 | if (handle == NULL) { |
243 | ret = -ENOMEM; | |
244 | mlog_errno(ret); | |
245 | goto out; | |
246 | } | |
247 | ||
248 | ret = ocfs2_set_inode_size(handle, inode, di_bh, | |
249 | new_i_size); | |
250 | if (ret < 0) | |
251 | mlog_errno(ret); | |
252 | ||
02dc1af4 | 253 | ocfs2_commit_trans(osb, handle); |
ccd979bd MF |
254 | out: |
255 | return ret; | |
256 | } | |
257 | ||
258 | static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb, | |
259 | struct inode *inode, | |
260 | struct buffer_head *fe_bh, | |
261 | u64 new_i_size) | |
262 | { | |
263 | int status; | |
1fabe148 | 264 | handle_t *handle; |
60b11392 | 265 | struct ocfs2_dinode *di; |
ccd979bd MF |
266 | |
267 | mlog_entry_void(); | |
268 | ||
269 | /* TODO: This needs to actually orphan the inode in this | |
270 | * transaction. */ | |
271 | ||
65eff9cc | 272 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
ccd979bd MF |
273 | if (IS_ERR(handle)) { |
274 | status = PTR_ERR(handle); | |
275 | mlog_errno(status); | |
276 | goto out; | |
277 | } | |
278 | ||
60b11392 MF |
279 | status = ocfs2_journal_access(handle, inode, fe_bh, |
280 | OCFS2_JOURNAL_ACCESS_WRITE); | |
281 | if (status < 0) { | |
282 | mlog_errno(status); | |
283 | goto out_commit; | |
284 | } | |
285 | ||
286 | /* | |
287 | * Do this before setting i_size. | |
288 | */ | |
289 | status = ocfs2_zero_tail_for_truncate(inode, handle, new_i_size); | |
290 | if (status) { | |
291 | mlog_errno(status); | |
292 | goto out_commit; | |
293 | } | |
294 | ||
295 | i_size_write(inode, new_i_size); | |
296 | inode->i_blocks = ocfs2_align_bytes_to_sectors(new_i_size); | |
297 | inode->i_ctime = inode->i_mtime = CURRENT_TIME; | |
298 | ||
299 | di = (struct ocfs2_dinode *) fe_bh->b_data; | |
300 | di->i_size = cpu_to_le64(new_i_size); | |
301 | di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec); | |
302 | di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); | |
303 | ||
304 | status = ocfs2_journal_dirty(handle, fe_bh); | |
ccd979bd MF |
305 | if (status < 0) |
306 | mlog_errno(status); | |
307 | ||
60b11392 | 308 | out_commit: |
02dc1af4 | 309 | ocfs2_commit_trans(osb, handle); |
ccd979bd | 310 | out: |
60b11392 | 311 | |
ccd979bd MF |
312 | mlog_exit(status); |
313 | return status; | |
314 | } | |
315 | ||
316 | static int ocfs2_truncate_file(struct inode *inode, | |
317 | struct buffer_head *di_bh, | |
318 | u64 new_i_size) | |
319 | { | |
320 | int status = 0; | |
321 | struct ocfs2_dinode *fe = NULL; | |
322 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
323 | struct ocfs2_truncate_context *tc = NULL; | |
324 | ||
b0697053 MF |
325 | mlog_entry("(inode = %llu, new_i_size = %llu\n", |
326 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
327 | (unsigned long long)new_i_size); | |
ccd979bd MF |
328 | |
329 | truncate_inode_pages(inode->i_mapping, new_i_size); | |
330 | ||
331 | fe = (struct ocfs2_dinode *) di_bh->b_data; | |
332 | if (!OCFS2_IS_VALID_DINODE(fe)) { | |
333 | OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); | |
334 | status = -EIO; | |
335 | goto bail; | |
336 | } | |
337 | ||
338 | mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode), | |
b0697053 MF |
339 | "Inode %llu, inode i_size = %lld != di " |
340 | "i_size = %llu, i_flags = 0x%x\n", | |
341 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd | 342 | i_size_read(inode), |
b0697053 MF |
343 | (unsigned long long)le64_to_cpu(fe->i_size), |
344 | le32_to_cpu(fe->i_flags)); | |
ccd979bd MF |
345 | |
346 | if (new_i_size > le64_to_cpu(fe->i_size)) { | |
b0697053 MF |
347 | mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n", |
348 | (unsigned long long)le64_to_cpu(fe->i_size), | |
349 | (unsigned long long)new_i_size); | |
ccd979bd MF |
350 | status = -EINVAL; |
351 | mlog_errno(status); | |
352 | goto bail; | |
353 | } | |
354 | ||
b0697053 MF |
355 | mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n", |
356 | (unsigned long long)le64_to_cpu(fe->i_blkno), | |
357 | (unsigned long long)le64_to_cpu(fe->i_size), | |
358 | (unsigned long long)new_i_size); | |
ccd979bd MF |
359 | |
360 | /* lets handle the simple truncate cases before doing any more | |
361 | * cluster locking. */ | |
362 | if (new_i_size == le64_to_cpu(fe->i_size)) | |
363 | goto bail; | |
364 | ||
ab0920ce MF |
365 | /* This forces other nodes to sync and drop their pages. Do |
366 | * this even if we have a truncate without allocation change - | |
367 | * ocfs2 cluster sizes can be much greater than page size, so | |
368 | * we have to truncate them anyway. */ | |
369 | status = ocfs2_data_lock(inode, 1); | |
370 | if (status < 0) { | |
371 | mlog_errno(status); | |
372 | goto bail; | |
373 | } | |
ab0920ce | 374 | |
ccd979bd MF |
375 | /* alright, we're going to need to do a full blown alloc size |
376 | * change. Orphan the inode so that recovery can complete the | |
377 | * truncate if necessary. This does the task of marking | |
378 | * i_size. */ | |
379 | status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size); | |
380 | if (status < 0) { | |
381 | mlog_errno(status); | |
60b11392 | 382 | goto bail_unlock_data; |
ccd979bd MF |
383 | } |
384 | ||
385 | status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc); | |
386 | if (status < 0) { | |
387 | mlog_errno(status); | |
60b11392 | 388 | goto bail_unlock_data; |
ccd979bd MF |
389 | } |
390 | ||
391 | status = ocfs2_commit_truncate(osb, inode, di_bh, tc); | |
392 | if (status < 0) { | |
393 | mlog_errno(status); | |
60b11392 | 394 | goto bail_unlock_data; |
ccd979bd MF |
395 | } |
396 | ||
397 | /* TODO: orphan dir cleanup here. */ | |
60b11392 MF |
398 | bail_unlock_data: |
399 | ocfs2_data_unlock(inode, 1); | |
400 | ||
ccd979bd MF |
401 | bail: |
402 | ||
403 | mlog_exit(status); | |
404 | return status; | |
405 | } | |
406 | ||
407 | /* | |
408 | * extend allocation only here. | |
409 | * we'll update all the disk stuff, and oip->alloc_size | |
410 | * | |
411 | * expect stuff to be locked, a transaction started and enough data / | |
412 | * metadata reservations in the contexts. | |
413 | * | |
414 | * Will return -EAGAIN, and a reason if a restart is needed. | |
415 | * If passed in, *reason will always be set, even in error. | |
416 | */ | |
417 | int ocfs2_do_extend_allocation(struct ocfs2_super *osb, | |
418 | struct inode *inode, | |
dcd0538f | 419 | u32 *logical_offset, |
ccd979bd MF |
420 | u32 clusters_to_add, |
421 | struct buffer_head *fe_bh, | |
1fabe148 | 422 | handle_t *handle, |
ccd979bd MF |
423 | struct ocfs2_alloc_context *data_ac, |
424 | struct ocfs2_alloc_context *meta_ac, | |
425 | enum ocfs2_alloc_restarted *reason_ret) | |
426 | { | |
427 | int status = 0; | |
428 | int free_extents; | |
429 | struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data; | |
430 | enum ocfs2_alloc_restarted reason = RESTART_NONE; | |
431 | u32 bit_off, num_bits; | |
432 | u64 block; | |
433 | ||
434 | BUG_ON(!clusters_to_add); | |
435 | ||
436 | free_extents = ocfs2_num_free_extents(osb, inode, fe); | |
437 | if (free_extents < 0) { | |
438 | status = free_extents; | |
439 | mlog_errno(status); | |
440 | goto leave; | |
441 | } | |
442 | ||
443 | /* there are two cases which could cause us to EAGAIN in the | |
444 | * we-need-more-metadata case: | |
445 | * 1) we haven't reserved *any* | |
446 | * 2) we are so fragmented, we've needed to add metadata too | |
447 | * many times. */ | |
448 | if (!free_extents && !meta_ac) { | |
449 | mlog(0, "we haven't reserved any metadata!\n"); | |
450 | status = -EAGAIN; | |
451 | reason = RESTART_META; | |
452 | goto leave; | |
453 | } else if ((!free_extents) | |
454 | && (ocfs2_alloc_context_bits_left(meta_ac) | |
455 | < ocfs2_extend_meta_needed(fe))) { | |
456 | mlog(0, "filesystem is really fragmented...\n"); | |
457 | status = -EAGAIN; | |
458 | reason = RESTART_META; | |
459 | goto leave; | |
460 | } | |
461 | ||
462 | status = ocfs2_claim_clusters(osb, handle, data_ac, 1, | |
463 | &bit_off, &num_bits); | |
464 | if (status < 0) { | |
465 | if (status != -ENOSPC) | |
466 | mlog_errno(status); | |
467 | goto leave; | |
468 | } | |
469 | ||
470 | BUG_ON(num_bits > clusters_to_add); | |
471 | ||
472 | /* reserve our write early -- insert_extent may update the inode */ | |
473 | status = ocfs2_journal_access(handle, inode, fe_bh, | |
474 | OCFS2_JOURNAL_ACCESS_WRITE); | |
475 | if (status < 0) { | |
476 | mlog_errno(status); | |
477 | goto leave; | |
478 | } | |
479 | ||
480 | block = ocfs2_clusters_to_blocks(osb->sb, bit_off); | |
b0697053 MF |
481 | mlog(0, "Allocating %u clusters at block %u for inode %llu\n", |
482 | num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
dcd0538f MF |
483 | status = ocfs2_insert_extent(osb, handle, inode, fe_bh, |
484 | *logical_offset, block, num_bits, | |
485 | meta_ac); | |
ccd979bd MF |
486 | if (status < 0) { |
487 | mlog_errno(status); | |
488 | goto leave; | |
489 | } | |
490 | ||
ccd979bd MF |
491 | status = ocfs2_journal_dirty(handle, fe_bh); |
492 | if (status < 0) { | |
493 | mlog_errno(status); | |
494 | goto leave; | |
495 | } | |
496 | ||
497 | clusters_to_add -= num_bits; | |
dcd0538f | 498 | *logical_offset += num_bits; |
ccd979bd MF |
499 | |
500 | if (clusters_to_add) { | |
501 | mlog(0, "need to alloc once more, clusters = %u, wanted = " | |
502 | "%u\n", fe->i_clusters, clusters_to_add); | |
503 | status = -EAGAIN; | |
504 | reason = RESTART_TRANS; | |
505 | } | |
506 | ||
507 | leave: | |
508 | mlog_exit(status); | |
509 | if (reason_ret) | |
510 | *reason_ret = reason; | |
511 | return status; | |
512 | } | |
513 | ||
abf8b156 MF |
514 | /* |
515 | * For a given allocation, determine which allocators will need to be | |
516 | * accessed, and lock them, reserving the appropriate number of bits. | |
517 | * | |
518 | * Called from ocfs2_extend_allocation() for file systems which don't | |
9517bac6 MF |
519 | * support holes, and from ocfs2_write() for file systems which |
520 | * understand sparse inodes. | |
abf8b156 | 521 | */ |
9517bac6 MF |
522 | int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_dinode *di, |
523 | u32 clusters_to_add, | |
524 | struct ocfs2_alloc_context **data_ac, | |
525 | struct ocfs2_alloc_context **meta_ac) | |
abf8b156 MF |
526 | { |
527 | int ret, num_free_extents; | |
528 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
529 | ||
530 | *meta_ac = NULL; | |
531 | *data_ac = NULL; | |
532 | ||
533 | mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, " | |
534 | "clusters_to_add = %u\n", | |
535 | (unsigned long long)OCFS2_I(inode)->ip_blkno, i_size_read(inode), | |
536 | le32_to_cpu(di->i_clusters), clusters_to_add); | |
537 | ||
538 | num_free_extents = ocfs2_num_free_extents(osb, inode, di); | |
539 | if (num_free_extents < 0) { | |
540 | ret = num_free_extents; | |
541 | mlog_errno(ret); | |
542 | goto out; | |
543 | } | |
544 | ||
545 | /* | |
546 | * Sparse allocation file systems need to be more conservative | |
547 | * with reserving room for expansion - the actual allocation | |
548 | * happens while we've got a journal handle open so re-taking | |
549 | * a cluster lock (because we ran out of room for another | |
550 | * extent) will violate ordering rules. | |
551 | * | |
9517bac6 | 552 | * Most of the time we'll only be seeing this 1 cluster at a time |
abf8b156 MF |
553 | * anyway. |
554 | */ | |
555 | if (!num_free_extents || | |
556 | (ocfs2_sparse_alloc(osb) && num_free_extents < clusters_to_add)) { | |
557 | ret = ocfs2_reserve_new_metadata(osb, di, meta_ac); | |
558 | if (ret < 0) { | |
559 | if (ret != -ENOSPC) | |
560 | mlog_errno(ret); | |
561 | goto out; | |
562 | } | |
563 | } | |
564 | ||
565 | ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac); | |
566 | if (ret < 0) { | |
567 | if (ret != -ENOSPC) | |
568 | mlog_errno(ret); | |
569 | goto out; | |
570 | } | |
571 | ||
572 | out: | |
573 | if (ret) { | |
574 | if (*meta_ac) { | |
575 | ocfs2_free_alloc_context(*meta_ac); | |
576 | *meta_ac = NULL; | |
577 | } | |
578 | ||
579 | /* | |
580 | * We cannot have an error and a non null *data_ac. | |
581 | */ | |
582 | } | |
583 | ||
584 | return ret; | |
585 | } | |
586 | ||
ccd979bd MF |
587 | static int ocfs2_extend_allocation(struct inode *inode, |
588 | u32 clusters_to_add) | |
589 | { | |
590 | int status = 0; | |
591 | int restart_func = 0; | |
592 | int drop_alloc_sem = 0; | |
abf8b156 | 593 | int credits; |
dcd0538f | 594 | u32 prev_clusters, logical_start; |
ccd979bd MF |
595 | struct buffer_head *bh = NULL; |
596 | struct ocfs2_dinode *fe = NULL; | |
1fabe148 | 597 | handle_t *handle = NULL; |
ccd979bd MF |
598 | struct ocfs2_alloc_context *data_ac = NULL; |
599 | struct ocfs2_alloc_context *meta_ac = NULL; | |
600 | enum ocfs2_alloc_restarted why; | |
601 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
602 | ||
603 | mlog_entry("(clusters_to_add = %u)\n", clusters_to_add); | |
604 | ||
dcd0538f MF |
605 | /* |
606 | * This function only exists for file systems which don't | |
607 | * support holes. | |
608 | */ | |
609 | BUG_ON(ocfs2_sparse_alloc(osb)); | |
610 | ||
ccd979bd MF |
611 | status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh, |
612 | OCFS2_BH_CACHED, inode); | |
613 | if (status < 0) { | |
614 | mlog_errno(status); | |
615 | goto leave; | |
616 | } | |
617 | ||
618 | fe = (struct ocfs2_dinode *) bh->b_data; | |
619 | if (!OCFS2_IS_VALID_DINODE(fe)) { | |
620 | OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); | |
621 | status = -EIO; | |
622 | goto leave; | |
623 | } | |
624 | ||
dcd0538f MF |
625 | logical_start = OCFS2_I(inode)->ip_clusters; |
626 | ||
ccd979bd MF |
627 | restart_all: |
628 | BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters); | |
629 | ||
ccd979bd | 630 | /* blocks peope in read/write from reading our allocation |
1b1dcc1b | 631 | * until we're done changing it. We depend on i_mutex to block |
ccd979bd MF |
632 | * other extend/truncate calls while we're here. Ordering wrt |
633 | * start_trans is important here -- always do it before! */ | |
634 | down_write(&OCFS2_I(inode)->ip_alloc_sem); | |
635 | drop_alloc_sem = 1; | |
636 | ||
9517bac6 MF |
637 | status = ocfs2_lock_allocators(inode, fe, clusters_to_add, &data_ac, |
638 | &meta_ac); | |
639 | if (status) { | |
640 | mlog_errno(status); | |
641 | goto leave; | |
642 | } | |
643 | ||
ccd979bd | 644 | credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add); |
65eff9cc | 645 | handle = ocfs2_start_trans(osb, credits); |
ccd979bd MF |
646 | if (IS_ERR(handle)) { |
647 | status = PTR_ERR(handle); | |
648 | handle = NULL; | |
649 | mlog_errno(status); | |
650 | goto leave; | |
651 | } | |
652 | ||
653 | restarted_transaction: | |
654 | /* reserve a write to the file entry early on - that we if we | |
655 | * run out of credits in the allocation path, we can still | |
656 | * update i_size. */ | |
657 | status = ocfs2_journal_access(handle, inode, bh, | |
658 | OCFS2_JOURNAL_ACCESS_WRITE); | |
659 | if (status < 0) { | |
660 | mlog_errno(status); | |
661 | goto leave; | |
662 | } | |
663 | ||
664 | prev_clusters = OCFS2_I(inode)->ip_clusters; | |
665 | ||
666 | status = ocfs2_do_extend_allocation(osb, | |
667 | inode, | |
dcd0538f | 668 | &logical_start, |
ccd979bd MF |
669 | clusters_to_add, |
670 | bh, | |
671 | handle, | |
672 | data_ac, | |
673 | meta_ac, | |
674 | &why); | |
675 | if ((status < 0) && (status != -EAGAIN)) { | |
676 | if (status != -ENOSPC) | |
677 | mlog_errno(status); | |
678 | goto leave; | |
679 | } | |
680 | ||
681 | status = ocfs2_journal_dirty(handle, bh); | |
682 | if (status < 0) { | |
683 | mlog_errno(status); | |
684 | goto leave; | |
685 | } | |
686 | ||
687 | spin_lock(&OCFS2_I(inode)->ip_lock); | |
688 | clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters); | |
689 | spin_unlock(&OCFS2_I(inode)->ip_lock); | |
690 | ||
691 | if (why != RESTART_NONE && clusters_to_add) { | |
692 | if (why == RESTART_META) { | |
693 | mlog(0, "restarting function.\n"); | |
694 | restart_func = 1; | |
695 | } else { | |
696 | BUG_ON(why != RESTART_TRANS); | |
697 | ||
698 | mlog(0, "restarting transaction.\n"); | |
699 | /* TODO: This can be more intelligent. */ | |
700 | credits = ocfs2_calc_extend_credits(osb->sb, | |
701 | fe, | |
702 | clusters_to_add); | |
1fabe148 | 703 | status = ocfs2_extend_trans(handle, credits); |
ccd979bd MF |
704 | if (status < 0) { |
705 | /* handle still has to be committed at | |
706 | * this point. */ | |
707 | status = -ENOMEM; | |
708 | mlog_errno(status); | |
709 | goto leave; | |
710 | } | |
711 | goto restarted_transaction; | |
712 | } | |
713 | } | |
714 | ||
b0697053 | 715 | mlog(0, "fe: i_clusters = %u, i_size=%llu\n", |
1ca1a111 MF |
716 | le32_to_cpu(fe->i_clusters), |
717 | (unsigned long long)le64_to_cpu(fe->i_size)); | |
ccd979bd MF |
718 | mlog(0, "inode: ip_clusters=%u, i_size=%lld\n", |
719 | OCFS2_I(inode)->ip_clusters, i_size_read(inode)); | |
720 | ||
721 | leave: | |
722 | if (drop_alloc_sem) { | |
723 | up_write(&OCFS2_I(inode)->ip_alloc_sem); | |
724 | drop_alloc_sem = 0; | |
725 | } | |
726 | if (handle) { | |
02dc1af4 | 727 | ocfs2_commit_trans(osb, handle); |
ccd979bd MF |
728 | handle = NULL; |
729 | } | |
730 | if (data_ac) { | |
731 | ocfs2_free_alloc_context(data_ac); | |
732 | data_ac = NULL; | |
733 | } | |
734 | if (meta_ac) { | |
735 | ocfs2_free_alloc_context(meta_ac); | |
736 | meta_ac = NULL; | |
737 | } | |
738 | if ((!status) && restart_func) { | |
739 | restart_func = 0; | |
740 | goto restart_all; | |
741 | } | |
742 | if (bh) { | |
743 | brelse(bh); | |
744 | bh = NULL; | |
745 | } | |
746 | ||
747 | mlog_exit(status); | |
748 | return status; | |
749 | } | |
750 | ||
751 | /* Some parts of this taken from generic_cont_expand, which turned out | |
752 | * to be too fragile to do exactly what we need without us having to | |
53013cba MF |
753 | * worry about recursive locking in ->prepare_write() and |
754 | * ->commit_write(). */ | |
ccd979bd MF |
755 | static int ocfs2_write_zero_page(struct inode *inode, |
756 | u64 size) | |
757 | { | |
758 | struct address_space *mapping = inode->i_mapping; | |
759 | struct page *page; | |
760 | unsigned long index; | |
761 | unsigned int offset; | |
1fabe148 | 762 | handle_t *handle = NULL; |
ccd979bd MF |
763 | int ret; |
764 | ||
765 | offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */ | |
766 | /* ugh. in prepare/commit_write, if from==to==start of block, we | |
767 | ** skip the prepare. make sure we never send an offset for the start | |
768 | ** of a block | |
769 | */ | |
770 | if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) { | |
771 | offset++; | |
772 | } | |
773 | index = size >> PAGE_CACHE_SHIFT; | |
774 | ||
775 | page = grab_cache_page(mapping, index); | |
776 | if (!page) { | |
777 | ret = -ENOMEM; | |
778 | mlog_errno(ret); | |
779 | goto out; | |
780 | } | |
781 | ||
53013cba | 782 | ret = ocfs2_prepare_write_nolock(inode, page, offset, offset); |
ccd979bd MF |
783 | if (ret < 0) { |
784 | mlog_errno(ret); | |
785 | goto out_unlock; | |
786 | } | |
787 | ||
788 | if (ocfs2_should_order_data(inode)) { | |
789 | handle = ocfs2_start_walk_page_trans(inode, page, offset, | |
790 | offset); | |
791 | if (IS_ERR(handle)) { | |
792 | ret = PTR_ERR(handle); | |
793 | handle = NULL; | |
794 | goto out_unlock; | |
795 | } | |
796 | } | |
797 | ||
798 | /* must not update i_size! */ | |
799 | ret = block_commit_write(page, offset, offset); | |
800 | if (ret < 0) | |
801 | mlog_errno(ret); | |
802 | else | |
803 | ret = 0; | |
804 | ||
805 | if (handle) | |
02dc1af4 | 806 | ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); |
ccd979bd MF |
807 | out_unlock: |
808 | unlock_page(page); | |
809 | page_cache_release(page); | |
810 | out: | |
811 | return ret; | |
812 | } | |
813 | ||
814 | static int ocfs2_zero_extend(struct inode *inode, | |
815 | u64 zero_to_size) | |
816 | { | |
817 | int ret = 0; | |
818 | u64 start_off; | |
819 | struct super_block *sb = inode->i_sb; | |
820 | ||
821 | start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode)); | |
822 | while (start_off < zero_to_size) { | |
823 | ret = ocfs2_write_zero_page(inode, start_off); | |
824 | if (ret < 0) { | |
825 | mlog_errno(ret); | |
826 | goto out; | |
827 | } | |
828 | ||
829 | start_off += sb->s_blocksize; | |
e2057c5a MF |
830 | |
831 | /* | |
832 | * Very large extends have the potential to lock up | |
833 | * the cpu for extended periods of time. | |
834 | */ | |
835 | cond_resched(); | |
ccd979bd MF |
836 | } |
837 | ||
838 | out: | |
839 | return ret; | |
840 | } | |
841 | ||
53013cba MF |
842 | /* |
843 | * A tail_to_skip value > 0 indicates that we're being called from | |
844 | * ocfs2_file_aio_write(). This has the following implications: | |
845 | * | |
846 | * - we don't want to update i_size | |
847 | * - di_bh will be NULL, which is fine because it's only used in the | |
848 | * case where we want to update i_size. | |
849 | * - ocfs2_zero_extend() will then only be filling the hole created | |
850 | * between i_size and the start of the write. | |
851 | */ | |
ccd979bd MF |
852 | static int ocfs2_extend_file(struct inode *inode, |
853 | struct buffer_head *di_bh, | |
53013cba MF |
854 | u64 new_i_size, |
855 | size_t tail_to_skip) | |
ccd979bd MF |
856 | { |
857 | int ret = 0; | |
3a0782d0 | 858 | u32 clusters_to_add = 0; |
ccd979bd | 859 | |
53013cba MF |
860 | BUG_ON(!tail_to_skip && !di_bh); |
861 | ||
ccd979bd MF |
862 | /* setattr sometimes calls us like this. */ |
863 | if (new_i_size == 0) | |
864 | goto out; | |
865 | ||
866 | if (i_size_read(inode) == new_i_size) | |
867 | goto out; | |
868 | BUG_ON(new_i_size < i_size_read(inode)); | |
869 | ||
3a0782d0 MF |
870 | if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) { |
871 | BUG_ON(tail_to_skip != 0); | |
872 | goto out_update_size; | |
873 | } | |
874 | ||
ccd979bd MF |
875 | clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size) - |
876 | OCFS2_I(inode)->ip_clusters; | |
877 | ||
0effef77 MF |
878 | /* |
879 | * protect the pages that ocfs2_zero_extend is going to be | |
880 | * pulling into the page cache.. we do this before the | |
881 | * metadata extend so that we don't get into the situation | |
882 | * where we've extended the metadata but can't get the data | |
883 | * lock to zero. | |
884 | */ | |
885 | ret = ocfs2_data_lock(inode, 1); | |
886 | if (ret < 0) { | |
887 | mlog_errno(ret); | |
888 | goto out; | |
889 | } | |
ccd979bd | 890 | |
0effef77 | 891 | if (clusters_to_add) { |
53013cba | 892 | ret = ocfs2_extend_allocation(inode, clusters_to_add); |
ccd979bd MF |
893 | if (ret < 0) { |
894 | mlog_errno(ret); | |
53013cba | 895 | goto out_unlock; |
ccd979bd | 896 | } |
0effef77 | 897 | } |
ccd979bd | 898 | |
0effef77 MF |
899 | /* |
900 | * Call this even if we don't add any clusters to the tree. We | |
901 | * still need to zero the area between the old i_size and the | |
902 | * new i_size. | |
903 | */ | |
904 | ret = ocfs2_zero_extend(inode, (u64)new_i_size - tail_to_skip); | |
905 | if (ret < 0) { | |
906 | mlog_errno(ret); | |
907 | goto out_unlock; | |
53013cba MF |
908 | } |
909 | ||
3a0782d0 | 910 | out_update_size: |
53013cba MF |
911 | if (!tail_to_skip) { |
912 | /* We're being called from ocfs2_setattr() which wants | |
913 | * us to update i_size */ | |
914 | ret = ocfs2_simple_size_update(inode, di_bh, new_i_size); | |
915 | if (ret < 0) | |
916 | mlog_errno(ret); | |
ccd979bd MF |
917 | } |
918 | ||
53013cba | 919 | out_unlock: |
3a0782d0 MF |
920 | if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) |
921 | ocfs2_data_unlock(inode, 1); | |
53013cba | 922 | |
ccd979bd MF |
923 | out: |
924 | return ret; | |
925 | } | |
926 | ||
927 | int ocfs2_setattr(struct dentry *dentry, struct iattr *attr) | |
928 | { | |
929 | int status = 0, size_change; | |
930 | struct inode *inode = dentry->d_inode; | |
931 | struct super_block *sb = inode->i_sb; | |
932 | struct ocfs2_super *osb = OCFS2_SB(sb); | |
933 | struct buffer_head *bh = NULL; | |
1fabe148 | 934 | handle_t *handle = NULL; |
ccd979bd MF |
935 | |
936 | mlog_entry("(0x%p, '%.*s')\n", dentry, | |
937 | dentry->d_name.len, dentry->d_name.name); | |
938 | ||
939 | if (attr->ia_valid & ATTR_MODE) | |
940 | mlog(0, "mode change: %d\n", attr->ia_mode); | |
941 | if (attr->ia_valid & ATTR_UID) | |
942 | mlog(0, "uid change: %d\n", attr->ia_uid); | |
943 | if (attr->ia_valid & ATTR_GID) | |
944 | mlog(0, "gid change: %d\n", attr->ia_gid); | |
945 | if (attr->ia_valid & ATTR_SIZE) | |
946 | mlog(0, "size change...\n"); | |
947 | if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME)) | |
948 | mlog(0, "time change...\n"); | |
949 | ||
950 | #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \ | |
951 | | ATTR_GID | ATTR_UID | ATTR_MODE) | |
952 | if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) { | |
953 | mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid); | |
954 | return 0; | |
955 | } | |
956 | ||
957 | status = inode_change_ok(inode, attr); | |
958 | if (status) | |
959 | return status; | |
960 | ||
961 | size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE; | |
962 | if (size_change) { | |
963 | status = ocfs2_rw_lock(inode, 1); | |
964 | if (status < 0) { | |
965 | mlog_errno(status); | |
966 | goto bail; | |
967 | } | |
968 | } | |
969 | ||
4bcec184 | 970 | status = ocfs2_meta_lock(inode, &bh, 1); |
ccd979bd MF |
971 | if (status < 0) { |
972 | if (status != -ENOENT) | |
973 | mlog_errno(status); | |
974 | goto bail_unlock_rw; | |
975 | } | |
976 | ||
977 | if (size_change && attr->ia_size != i_size_read(inode)) { | |
978 | if (i_size_read(inode) > attr->ia_size) | |
979 | status = ocfs2_truncate_file(inode, bh, attr->ia_size); | |
980 | else | |
53013cba | 981 | status = ocfs2_extend_file(inode, bh, attr->ia_size, 0); |
ccd979bd MF |
982 | if (status < 0) { |
983 | if (status != -ENOSPC) | |
984 | mlog_errno(status); | |
985 | status = -ENOSPC; | |
986 | goto bail_unlock; | |
987 | } | |
988 | } | |
989 | ||
65eff9cc | 990 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
ccd979bd MF |
991 | if (IS_ERR(handle)) { |
992 | status = PTR_ERR(handle); | |
993 | mlog_errno(status); | |
994 | goto bail_unlock; | |
995 | } | |
996 | ||
997 | status = inode_setattr(inode, attr); | |
998 | if (status < 0) { | |
999 | mlog_errno(status); | |
1000 | goto bail_commit; | |
1001 | } | |
1002 | ||
1003 | status = ocfs2_mark_inode_dirty(handle, inode, bh); | |
1004 | if (status < 0) | |
1005 | mlog_errno(status); | |
1006 | ||
1007 | bail_commit: | |
02dc1af4 | 1008 | ocfs2_commit_trans(osb, handle); |
ccd979bd MF |
1009 | bail_unlock: |
1010 | ocfs2_meta_unlock(inode, 1); | |
1011 | bail_unlock_rw: | |
1012 | if (size_change) | |
1013 | ocfs2_rw_unlock(inode, 1); | |
1014 | bail: | |
1015 | if (bh) | |
1016 | brelse(bh); | |
1017 | ||
1018 | mlog_exit(status); | |
1019 | return status; | |
1020 | } | |
1021 | ||
1022 | int ocfs2_getattr(struct vfsmount *mnt, | |
1023 | struct dentry *dentry, | |
1024 | struct kstat *stat) | |
1025 | { | |
1026 | struct inode *inode = dentry->d_inode; | |
1027 | struct super_block *sb = dentry->d_inode->i_sb; | |
1028 | struct ocfs2_super *osb = sb->s_fs_info; | |
1029 | int err; | |
1030 | ||
1031 | mlog_entry_void(); | |
1032 | ||
1033 | err = ocfs2_inode_revalidate(dentry); | |
1034 | if (err) { | |
1035 | if (err != -ENOENT) | |
1036 | mlog_errno(err); | |
1037 | goto bail; | |
1038 | } | |
1039 | ||
1040 | generic_fillattr(inode, stat); | |
1041 | ||
1042 | /* We set the blksize from the cluster size for performance */ | |
1043 | stat->blksize = osb->s_clustersize; | |
1044 | ||
1045 | bail: | |
1046 | mlog_exit(err); | |
1047 | ||
1048 | return err; | |
1049 | } | |
1050 | ||
d38eb8db TY |
1051 | int ocfs2_permission(struct inode *inode, int mask, struct nameidata *nd) |
1052 | { | |
1053 | int ret; | |
1054 | ||
1055 | mlog_entry_void(); | |
1056 | ||
1057 | ret = ocfs2_meta_lock(inode, NULL, 0); | |
1058 | if (ret) { | |
a9f5f707 MF |
1059 | if (ret != -ENOENT) |
1060 | mlog_errno(ret); | |
d38eb8db TY |
1061 | goto out; |
1062 | } | |
1063 | ||
1064 | ret = generic_permission(inode, mask, NULL); | |
d38eb8db TY |
1065 | |
1066 | ocfs2_meta_unlock(inode, 0); | |
1067 | out: | |
1068 | mlog_exit(ret); | |
1069 | return ret; | |
1070 | } | |
1071 | ||
ccd979bd MF |
1072 | static int ocfs2_write_remove_suid(struct inode *inode) |
1073 | { | |
1074 | int ret; | |
1075 | struct buffer_head *bh = NULL; | |
1076 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
1fabe148 | 1077 | handle_t *handle; |
ccd979bd MF |
1078 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
1079 | struct ocfs2_dinode *di; | |
1080 | ||
b0697053 MF |
1081 | mlog_entry("(Inode %llu, mode 0%o)\n", |
1082 | (unsigned long long)oi->ip_blkno, inode->i_mode); | |
ccd979bd | 1083 | |
65eff9cc | 1084 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
ccd979bd MF |
1085 | if (handle == NULL) { |
1086 | ret = -ENOMEM; | |
1087 | mlog_errno(ret); | |
1088 | goto out; | |
1089 | } | |
1090 | ||
1091 | ret = ocfs2_read_block(osb, oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode); | |
1092 | if (ret < 0) { | |
1093 | mlog_errno(ret); | |
1094 | goto out_trans; | |
1095 | } | |
1096 | ||
1097 | ret = ocfs2_journal_access(handle, inode, bh, | |
1098 | OCFS2_JOURNAL_ACCESS_WRITE); | |
1099 | if (ret < 0) { | |
1100 | mlog_errno(ret); | |
1101 | goto out_bh; | |
1102 | } | |
1103 | ||
1104 | inode->i_mode &= ~S_ISUID; | |
1105 | if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP)) | |
1106 | inode->i_mode &= ~S_ISGID; | |
1107 | ||
1108 | di = (struct ocfs2_dinode *) bh->b_data; | |
1109 | di->i_mode = cpu_to_le16(inode->i_mode); | |
1110 | ||
1111 | ret = ocfs2_journal_dirty(handle, bh); | |
1112 | if (ret < 0) | |
1113 | mlog_errno(ret); | |
1114 | out_bh: | |
1115 | brelse(bh); | |
1116 | out_trans: | |
02dc1af4 | 1117 | ocfs2_commit_trans(osb, handle); |
ccd979bd MF |
1118 | out: |
1119 | mlog_exit(ret); | |
1120 | return ret; | |
1121 | } | |
1122 | ||
9517bac6 MF |
1123 | /* |
1124 | * Will look for holes and unwritten extents in the range starting at | |
1125 | * pos for count bytes (inclusive). | |
1126 | */ | |
1127 | static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos, | |
1128 | size_t count) | |
1129 | { | |
1130 | int ret = 0; | |
49cb8d2d | 1131 | unsigned int extent_flags; |
9517bac6 MF |
1132 | u32 cpos, clusters, extent_len, phys_cpos; |
1133 | struct super_block *sb = inode->i_sb; | |
1134 | ||
1135 | cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits; | |
1136 | clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos; | |
1137 | ||
1138 | while (clusters) { | |
49cb8d2d MF |
1139 | ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len, |
1140 | &extent_flags); | |
9517bac6 MF |
1141 | if (ret < 0) { |
1142 | mlog_errno(ret); | |
1143 | goto out; | |
1144 | } | |
1145 | ||
49cb8d2d | 1146 | if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) { |
9517bac6 MF |
1147 | ret = 1; |
1148 | break; | |
1149 | } | |
1150 | ||
1151 | if (extent_len > clusters) | |
1152 | extent_len = clusters; | |
1153 | ||
1154 | clusters -= extent_len; | |
1155 | cpos += extent_len; | |
1156 | } | |
1157 | out: | |
1158 | return ret; | |
1159 | } | |
1160 | ||
8659ac25 TY |
1161 | static int ocfs2_prepare_inode_for_write(struct dentry *dentry, |
1162 | loff_t *ppos, | |
1163 | size_t count, | |
9517bac6 MF |
1164 | int appending, |
1165 | int *direct_io) | |
ccd979bd | 1166 | { |
8659ac25 TY |
1167 | int ret = 0, meta_level = appending; |
1168 | struct inode *inode = dentry->d_inode; | |
ccd979bd | 1169 | u32 clusters; |
ccd979bd | 1170 | loff_t newsize, saved_pos; |
ccd979bd | 1171 | |
ccd979bd MF |
1172 | /* |
1173 | * We sample i_size under a read level meta lock to see if our write | |
1174 | * is extending the file, if it is we back off and get a write level | |
1175 | * meta lock. | |
1176 | */ | |
ccd979bd | 1177 | for(;;) { |
4bcec184 | 1178 | ret = ocfs2_meta_lock(inode, NULL, meta_level); |
ccd979bd MF |
1179 | if (ret < 0) { |
1180 | meta_level = -1; | |
1181 | mlog_errno(ret); | |
1182 | goto out; | |
1183 | } | |
1184 | ||
1185 | /* Clear suid / sgid if necessary. We do this here | |
1186 | * instead of later in the write path because | |
1187 | * remove_suid() calls ->setattr without any hint that | |
1188 | * we may have already done our cluster locking. Since | |
1189 | * ocfs2_setattr() *must* take cluster locks to | |
1190 | * proceeed, this will lead us to recursively lock the | |
1191 | * inode. There's also the dinode i_size state which | |
1192 | * can be lost via setattr during extending writes (we | |
1193 | * set inode->i_size at the end of a write. */ | |
8659ac25 | 1194 | if (should_remove_suid(dentry)) { |
ccd979bd MF |
1195 | if (meta_level == 0) { |
1196 | ocfs2_meta_unlock(inode, meta_level); | |
1197 | meta_level = 1; | |
1198 | continue; | |
1199 | } | |
1200 | ||
1201 | ret = ocfs2_write_remove_suid(inode); | |
1202 | if (ret < 0) { | |
1203 | mlog_errno(ret); | |
8659ac25 | 1204 | goto out_unlock; |
ccd979bd MF |
1205 | } |
1206 | } | |
1207 | ||
1208 | /* work on a copy of ppos until we're sure that we won't have | |
1209 | * to recalculate it due to relocking. */ | |
8659ac25 | 1210 | if (appending) { |
ccd979bd MF |
1211 | saved_pos = i_size_read(inode); |
1212 | mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos); | |
1213 | } else { | |
8659ac25 | 1214 | saved_pos = *ppos; |
ccd979bd | 1215 | } |
3a0782d0 | 1216 | |
9517bac6 MF |
1217 | if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) { |
1218 | loff_t end = saved_pos + count; | |
1219 | ||
1220 | /* | |
1221 | * Skip the O_DIRECT checks if we don't need | |
1222 | * them. | |
1223 | */ | |
1224 | if (!direct_io || !(*direct_io)) | |
1225 | break; | |
1226 | ||
1227 | /* | |
1228 | * Allowing concurrent direct writes means | |
1229 | * i_size changes wouldn't be synchronized, so | |
1230 | * one node could wind up truncating another | |
1231 | * nodes writes. | |
1232 | */ | |
1233 | if (end > i_size_read(inode)) { | |
1234 | *direct_io = 0; | |
1235 | break; | |
1236 | } | |
1237 | ||
1238 | /* | |
1239 | * We don't fill holes during direct io, so | |
1240 | * check for them here. If any are found, the | |
1241 | * caller will have to retake some cluster | |
1242 | * locks and initiate the io as buffered. | |
1243 | */ | |
1244 | ret = ocfs2_check_range_for_holes(inode, saved_pos, | |
1245 | count); | |
1246 | if (ret == 1) { | |
1247 | *direct_io = 0; | |
1248 | ret = 0; | |
1249 | } else if (ret < 0) | |
1250 | mlog_errno(ret); | |
1251 | break; | |
1252 | } | |
1253 | ||
3a0782d0 MF |
1254 | /* |
1255 | * The rest of this loop is concerned with legacy file | |
1256 | * systems which don't support sparse files. | |
1257 | */ | |
3a0782d0 | 1258 | |
8659ac25 | 1259 | newsize = count + saved_pos; |
ccd979bd | 1260 | |
215c7f9f MF |
1261 | mlog(0, "pos=%lld newsize=%lld cursize=%lld\n", |
1262 | (long long) saved_pos, (long long) newsize, | |
1263 | (long long) i_size_read(inode)); | |
ccd979bd MF |
1264 | |
1265 | /* No need for a higher level metadata lock if we're | |
1266 | * never going past i_size. */ | |
1267 | if (newsize <= i_size_read(inode)) | |
1268 | break; | |
1269 | ||
1270 | if (meta_level == 0) { | |
1271 | ocfs2_meta_unlock(inode, meta_level); | |
1272 | meta_level = 1; | |
1273 | continue; | |
1274 | } | |
1275 | ||
1276 | spin_lock(&OCFS2_I(inode)->ip_lock); | |
1277 | clusters = ocfs2_clusters_for_bytes(inode->i_sb, newsize) - | |
1278 | OCFS2_I(inode)->ip_clusters; | |
1279 | spin_unlock(&OCFS2_I(inode)->ip_lock); | |
1280 | ||
1281 | mlog(0, "Writing at EOF, may need more allocation: " | |
215c7f9f MF |
1282 | "i_size = %lld, newsize = %lld, need %u clusters\n", |
1283 | (long long) i_size_read(inode), (long long) newsize, | |
1284 | clusters); | |
ccd979bd MF |
1285 | |
1286 | /* We only want to continue the rest of this loop if | |
1287 | * our extend will actually require more | |
1288 | * allocation. */ | |
1289 | if (!clusters) | |
1290 | break; | |
1291 | ||
8659ac25 | 1292 | ret = ocfs2_extend_file(inode, NULL, newsize, count); |
ccd979bd MF |
1293 | if (ret < 0) { |
1294 | if (ret != -ENOSPC) | |
1295 | mlog_errno(ret); | |
8659ac25 | 1296 | goto out_unlock; |
ccd979bd | 1297 | } |
ccd979bd MF |
1298 | break; |
1299 | } | |
1300 | ||
8659ac25 TY |
1301 | if (appending) |
1302 | *ppos = saved_pos; | |
1303 | ||
1304 | out_unlock: | |
ccd979bd | 1305 | ocfs2_meta_unlock(inode, meta_level); |
8659ac25 TY |
1306 | |
1307 | out: | |
1308 | return ret; | |
1309 | } | |
1310 | ||
9517bac6 MF |
1311 | static inline void |
1312 | ocfs2_set_next_iovec(const struct iovec **iovp, size_t *basep, size_t bytes) | |
1313 | { | |
1314 | const struct iovec *iov = *iovp; | |
1315 | size_t base = *basep; | |
1316 | ||
1317 | do { | |
1318 | int copy = min(bytes, iov->iov_len - base); | |
1319 | ||
1320 | bytes -= copy; | |
1321 | base += copy; | |
1322 | if (iov->iov_len == base) { | |
1323 | iov++; | |
1324 | base = 0; | |
1325 | } | |
1326 | } while (bytes); | |
1327 | *iovp = iov; | |
1328 | *basep = base; | |
1329 | } | |
1330 | ||
1331 | static struct page * ocfs2_get_write_source(struct ocfs2_buffered_write_priv *bp, | |
1332 | const struct iovec *cur_iov, | |
1333 | size_t iov_offset) | |
1334 | { | |
1335 | int ret; | |
1336 | char *buf; | |
1337 | struct page *src_page = NULL; | |
1338 | ||
1339 | buf = cur_iov->iov_base + iov_offset; | |
1340 | ||
1341 | if (!segment_eq(get_fs(), KERNEL_DS)) { | |
1342 | /* | |
1343 | * Pull in the user page. We want to do this outside | |
1344 | * of the meta data locks in order to preserve locking | |
1345 | * order in case of page fault. | |
1346 | */ | |
1347 | ret = get_user_pages(current, current->mm, | |
1348 | (unsigned long)buf & PAGE_CACHE_MASK, 1, | |
1349 | 0, 0, &src_page, NULL); | |
1350 | if (ret == 1) | |
1351 | bp->b_src_buf = kmap(src_page); | |
1352 | else | |
1353 | src_page = ERR_PTR(-EFAULT); | |
1354 | } else { | |
1355 | bp->b_src_buf = buf; | |
1356 | } | |
1357 | ||
1358 | return src_page; | |
1359 | } | |
1360 | ||
1361 | static void ocfs2_put_write_source(struct ocfs2_buffered_write_priv *bp, | |
1362 | struct page *page) | |
1363 | { | |
1364 | if (page) { | |
1365 | kunmap(page); | |
1366 | page_cache_release(page); | |
1367 | } | |
1368 | } | |
1369 | ||
1370 | static ssize_t ocfs2_file_buffered_write(struct file *file, loff_t *ppos, | |
1371 | const struct iovec *iov, | |
1372 | unsigned long nr_segs, | |
1373 | size_t count, | |
1374 | ssize_t o_direct_written) | |
1375 | { | |
1376 | int ret = 0; | |
1377 | ssize_t copied, total = 0; | |
1378 | size_t iov_offset = 0; | |
1379 | const struct iovec *cur_iov = iov; | |
1380 | struct ocfs2_buffered_write_priv bp; | |
1381 | struct page *page; | |
1382 | ||
1383 | /* | |
1384 | * handle partial DIO write. Adjust cur_iov if needed. | |
1385 | */ | |
1386 | ocfs2_set_next_iovec(&cur_iov, &iov_offset, o_direct_written); | |
1387 | ||
1388 | do { | |
1389 | bp.b_cur_off = iov_offset; | |
1390 | bp.b_cur_iov = cur_iov; | |
1391 | ||
1392 | page = ocfs2_get_write_source(&bp, cur_iov, iov_offset); | |
1393 | if (IS_ERR(page)) { | |
1394 | ret = PTR_ERR(page); | |
1395 | goto out; | |
1396 | } | |
1397 | ||
1398 | copied = ocfs2_buffered_write_cluster(file, *ppos, count, | |
1399 | ocfs2_map_and_write_user_data, | |
1400 | &bp); | |
1401 | ||
1402 | ocfs2_put_write_source(&bp, page); | |
1403 | ||
1404 | if (copied < 0) { | |
1405 | mlog_errno(copied); | |
1406 | ret = copied; | |
1407 | goto out; | |
1408 | } | |
1409 | ||
1410 | total += copied; | |
1411 | *ppos = *ppos + copied; | |
1412 | count -= copied; | |
1413 | ||
1414 | ocfs2_set_next_iovec(&cur_iov, &iov_offset, copied); | |
1415 | } while(count); | |
1416 | ||
1417 | out: | |
1418 | return total ? total : ret; | |
1419 | } | |
1420 | ||
1421 | static int ocfs2_check_iovec(const struct iovec *iov, size_t *counted, | |
1422 | unsigned long *nr_segs) | |
1423 | { | |
1424 | size_t ocount; /* original count */ | |
1425 | unsigned long seg; | |
1426 | ||
1427 | ocount = 0; | |
1428 | for (seg = 0; seg < *nr_segs; seg++) { | |
1429 | const struct iovec *iv = &iov[seg]; | |
1430 | ||
1431 | /* | |
1432 | * If any segment has a negative length, or the cumulative | |
1433 | * length ever wraps negative then return -EINVAL. | |
1434 | */ | |
1435 | ocount += iv->iov_len; | |
1436 | if (unlikely((ssize_t)(ocount|iv->iov_len) < 0)) | |
1437 | return -EINVAL; | |
1438 | if (access_ok(VERIFY_READ, iv->iov_base, iv->iov_len)) | |
1439 | continue; | |
1440 | if (seg == 0) | |
1441 | return -EFAULT; | |
1442 | *nr_segs = seg; | |
1443 | ocount -= iv->iov_len; /* This segment is no good */ | |
1444 | break; | |
1445 | } | |
1446 | ||
1447 | *counted = ocount; | |
1448 | return 0; | |
1449 | } | |
1450 | ||
8659ac25 TY |
1451 | static ssize_t ocfs2_file_aio_write(struct kiocb *iocb, |
1452 | const struct iovec *iov, | |
1453 | unsigned long nr_segs, | |
1454 | loff_t pos) | |
1455 | { | |
9517bac6 MF |
1456 | int ret, direct_io, appending, rw_level, have_alloc_sem = 0; |
1457 | int can_do_direct, sync = 0; | |
1458 | ssize_t written = 0; | |
1459 | size_t ocount; /* original count */ | |
1460 | size_t count; /* after file limit checks */ | |
1461 | loff_t *ppos = &iocb->ki_pos; | |
1462 | struct file *file = iocb->ki_filp; | |
1463 | struct inode *inode = file->f_path.dentry->d_inode; | |
1464 | ||
1465 | mlog_entry("(0x%p, %u, '%.*s')\n", file, | |
8659ac25 | 1466 | (unsigned int)nr_segs, |
9517bac6 MF |
1467 | file->f_path.dentry->d_name.len, |
1468 | file->f_path.dentry->d_name.name); | |
8659ac25 | 1469 | |
8659ac25 TY |
1470 | if (iocb->ki_left == 0) |
1471 | return 0; | |
1472 | ||
9517bac6 MF |
1473 | ret = ocfs2_check_iovec(iov, &ocount, &nr_segs); |
1474 | if (ret) | |
1475 | return ret; | |
1476 | ||
1477 | count = ocount; | |
1478 | ||
1479 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); | |
1480 | ||
1481 | appending = file->f_flags & O_APPEND ? 1 : 0; | |
1482 | direct_io = file->f_flags & O_DIRECT ? 1 : 0; | |
1483 | ||
8659ac25 | 1484 | mutex_lock(&inode->i_mutex); |
9517bac6 MF |
1485 | |
1486 | relock: | |
8659ac25 | 1487 | /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */ |
9517bac6 | 1488 | if (direct_io) { |
8659ac25 | 1489 | down_read(&inode->i_alloc_sem); |
9517bac6 | 1490 | have_alloc_sem = 1; |
8659ac25 TY |
1491 | } |
1492 | ||
1493 | /* concurrent O_DIRECT writes are allowed */ | |
9517bac6 | 1494 | rw_level = !direct_io; |
8659ac25 TY |
1495 | ret = ocfs2_rw_lock(inode, rw_level); |
1496 | if (ret < 0) { | |
8659ac25 | 1497 | mlog_errno(ret); |
9517bac6 | 1498 | goto out_sems; |
8659ac25 TY |
1499 | } |
1500 | ||
9517bac6 MF |
1501 | can_do_direct = direct_io; |
1502 | ret = ocfs2_prepare_inode_for_write(file->f_path.dentry, ppos, | |
1503 | iocb->ki_left, appending, | |
1504 | &can_do_direct); | |
8659ac25 TY |
1505 | if (ret < 0) { |
1506 | mlog_errno(ret); | |
1507 | goto out; | |
1508 | } | |
ccd979bd | 1509 | |
9517bac6 MF |
1510 | /* |
1511 | * We can't complete the direct I/O as requested, fall back to | |
1512 | * buffered I/O. | |
1513 | */ | |
1514 | if (direct_io && !can_do_direct) { | |
1515 | ocfs2_rw_unlock(inode, rw_level); | |
1516 | up_read(&inode->i_alloc_sem); | |
1517 | ||
1518 | have_alloc_sem = 0; | |
1519 | rw_level = -1; | |
1520 | ||
1521 | direct_io = 0; | |
1522 | sync = 1; | |
1523 | goto relock; | |
1524 | } | |
1525 | ||
1526 | if (!sync && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) | |
1527 | sync = 1; | |
1528 | ||
1529 | /* | |
1530 | * XXX: Is it ok to execute these checks a second time? | |
1531 | */ | |
1532 | ret = generic_write_checks(file, ppos, &count, S_ISBLK(inode->i_mode)); | |
1533 | if (ret) | |
1534 | goto out; | |
1535 | ||
1536 | /* | |
1537 | * Set pos so that sync_page_range_nolock() below understands | |
1538 | * where to start from. We might've moved it around via the | |
1539 | * calls above. The range we want to actually sync starts from | |
1540 | * *ppos here. | |
1541 | * | |
1542 | */ | |
1543 | pos = *ppos; | |
1544 | ||
ccd979bd | 1545 | /* communicate with ocfs2_dio_end_io */ |
7cdfc3a1 | 1546 | ocfs2_iocb_set_rw_locked(iocb, rw_level); |
ccd979bd | 1547 | |
9517bac6 MF |
1548 | if (direct_io) { |
1549 | written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos, | |
1550 | ppos, count, ocount); | |
1551 | if (written < 0) { | |
1552 | ret = written; | |
1553 | goto out_dio; | |
1554 | } | |
1555 | } else { | |
1556 | written = ocfs2_file_buffered_write(file, ppos, iov, nr_segs, | |
1557 | count, written); | |
1558 | if (written < 0) { | |
1559 | ret = written; | |
1560 | if (ret != -EFAULT || ret != -ENOSPC) | |
1561 | mlog_errno(ret); | |
1562 | goto out; | |
1563 | } | |
1564 | } | |
ccd979bd | 1565 | |
9517bac6 | 1566 | out_dio: |
ccd979bd | 1567 | /* buffered aio wouldn't have proper lock coverage today */ |
9517bac6 | 1568 | BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT)); |
ccd979bd MF |
1569 | |
1570 | /* | |
1571 | * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io | |
1572 | * function pointer which is called when o_direct io completes so that | |
1573 | * it can unlock our rw lock. (it's the clustered equivalent of | |
1574 | * i_alloc_sem; protects truncate from racing with pending ios). | |
1575 | * Unfortunately there are error cases which call end_io and others | |
1576 | * that don't. so we don't have to unlock the rw_lock if either an | |
1577 | * async dio is going to do it in the future or an end_io after an | |
1578 | * error has already done it. | |
1579 | */ | |
1580 | if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) { | |
1581 | rw_level = -1; | |
1582 | have_alloc_sem = 0; | |
1583 | } | |
1584 | ||
1585 | out: | |
9517bac6 MF |
1586 | if (rw_level != -1) |
1587 | ocfs2_rw_unlock(inode, rw_level); | |
1588 | ||
1589 | out_sems: | |
ccd979bd MF |
1590 | if (have_alloc_sem) |
1591 | up_read(&inode->i_alloc_sem); | |
9517bac6 MF |
1592 | |
1593 | if (written > 0 && sync) { | |
1594 | ssize_t err; | |
1595 | ||
1596 | err = sync_page_range_nolock(inode, file->f_mapping, pos, count); | |
1597 | if (err < 0) | |
1598 | written = err; | |
1599 | } | |
1600 | ||
1b1dcc1b | 1601 | mutex_unlock(&inode->i_mutex); |
ccd979bd MF |
1602 | |
1603 | mlog_exit(ret); | |
9517bac6 | 1604 | return written ? written : ret; |
ccd979bd MF |
1605 | } |
1606 | ||
6af67d82 MF |
1607 | static int ocfs2_splice_write_actor(struct pipe_inode_info *pipe, |
1608 | struct pipe_buffer *buf, | |
1609 | struct splice_desc *sd) | |
1610 | { | |
1611 | int ret, count, total = 0; | |
1612 | ssize_t copied = 0; | |
1613 | struct ocfs2_splice_write_priv sp; | |
1614 | ||
1615 | ret = buf->ops->pin(pipe, buf); | |
1616 | if (ret) | |
1617 | goto out; | |
1618 | ||
1619 | sp.s_sd = sd; | |
1620 | sp.s_buf = buf; | |
1621 | sp.s_pipe = pipe; | |
1622 | sp.s_offset = sd->pos & ~PAGE_CACHE_MASK; | |
1623 | sp.s_buf_offset = buf->offset; | |
1624 | ||
1625 | count = sd->len; | |
1626 | if (count + sp.s_offset > PAGE_CACHE_SIZE) | |
1627 | count = PAGE_CACHE_SIZE - sp.s_offset; | |
1628 | ||
1629 | do { | |
1630 | /* | |
1631 | * splice wants us to copy up to one page at a | |
1632 | * time. For pagesize > cluster size, this means we | |
1633 | * might enter ocfs2_buffered_write_cluster() more | |
1634 | * than once, so keep track of our progress here. | |
1635 | */ | |
1636 | copied = ocfs2_buffered_write_cluster(sd->file, | |
1637 | (loff_t)sd->pos + total, | |
1638 | count, | |
1639 | ocfs2_map_and_write_splice_data, | |
1640 | &sp); | |
1641 | if (copied < 0) { | |
1642 | mlog_errno(copied); | |
1643 | ret = copied; | |
1644 | goto out; | |
1645 | } | |
1646 | ||
1647 | count -= copied; | |
1648 | sp.s_offset += copied; | |
1649 | sp.s_buf_offset += copied; | |
1650 | total += copied; | |
1651 | } while (count); | |
1652 | ||
1653 | ret = 0; | |
1654 | out: | |
1655 | ||
1656 | return total ? total : ret; | |
1657 | } | |
1658 | ||
1659 | static ssize_t __ocfs2_file_splice_write(struct pipe_inode_info *pipe, | |
1660 | struct file *out, | |
1661 | loff_t *ppos, | |
1662 | size_t len, | |
1663 | unsigned int flags) | |
1664 | { | |
1665 | int ret, err; | |
1666 | struct address_space *mapping = out->f_mapping; | |
1667 | struct inode *inode = mapping->host; | |
1668 | ||
1669 | ret = __splice_from_pipe(pipe, out, ppos, len, flags, | |
1670 | ocfs2_splice_write_actor); | |
1671 | if (ret > 0) { | |
1672 | *ppos += ret; | |
1673 | ||
1674 | if (unlikely((out->f_flags & O_SYNC) || IS_SYNC(inode))) { | |
1675 | err = generic_osync_inode(inode, mapping, | |
1676 | OSYNC_METADATA|OSYNC_DATA); | |
1677 | if (err) | |
1678 | ret = err; | |
1679 | } | |
1680 | } | |
1681 | ||
1682 | return ret; | |
1683 | } | |
1684 | ||
8659ac25 TY |
1685 | static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe, |
1686 | struct file *out, | |
1687 | loff_t *ppos, | |
1688 | size_t len, | |
1689 | unsigned int flags) | |
1690 | { | |
1691 | int ret; | |
d28c9174 | 1692 | struct inode *inode = out->f_path.dentry->d_inode; |
8659ac25 TY |
1693 | |
1694 | mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out, pipe, | |
1695 | (unsigned int)len, | |
d28c9174 JS |
1696 | out->f_path.dentry->d_name.len, |
1697 | out->f_path.dentry->d_name.name); | |
8659ac25 TY |
1698 | |
1699 | inode_double_lock(inode, pipe->inode); | |
1700 | ||
1701 | ret = ocfs2_rw_lock(inode, 1); | |
1702 | if (ret < 0) { | |
1703 | mlog_errno(ret); | |
1704 | goto out; | |
1705 | } | |
1706 | ||
9517bac6 MF |
1707 | ret = ocfs2_prepare_inode_for_write(out->f_path.dentry, ppos, len, 0, |
1708 | NULL); | |
8659ac25 TY |
1709 | if (ret < 0) { |
1710 | mlog_errno(ret); | |
1711 | goto out_unlock; | |
1712 | } | |
1713 | ||
1714 | /* ok, we're done with i_size and alloc work */ | |
6af67d82 | 1715 | ret = __ocfs2_file_splice_write(pipe, out, ppos, len, flags); |
8659ac25 TY |
1716 | |
1717 | out_unlock: | |
1718 | ocfs2_rw_unlock(inode, 1); | |
1719 | out: | |
1720 | inode_double_unlock(inode, pipe->inode); | |
1721 | ||
1722 | mlog_exit(ret); | |
1723 | return ret; | |
1724 | } | |
1725 | ||
1726 | static ssize_t ocfs2_file_splice_read(struct file *in, | |
1727 | loff_t *ppos, | |
1728 | struct pipe_inode_info *pipe, | |
1729 | size_t len, | |
1730 | unsigned int flags) | |
1731 | { | |
1732 | int ret = 0; | |
d28c9174 | 1733 | struct inode *inode = in->f_path.dentry->d_inode; |
8659ac25 TY |
1734 | |
1735 | mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe, | |
1736 | (unsigned int)len, | |
d28c9174 JS |
1737 | in->f_path.dentry->d_name.len, |
1738 | in->f_path.dentry->d_name.name); | |
8659ac25 TY |
1739 | |
1740 | /* | |
1741 | * See the comment in ocfs2_file_aio_read() | |
1742 | */ | |
1743 | ret = ocfs2_meta_lock(inode, NULL, 0); | |
1744 | if (ret < 0) { | |
1745 | mlog_errno(ret); | |
1746 | goto bail; | |
1747 | } | |
1748 | ocfs2_meta_unlock(inode, 0); | |
1749 | ||
1750 | ret = generic_file_splice_read(in, ppos, pipe, len, flags); | |
1751 | ||
1752 | bail: | |
1753 | mlog_exit(ret); | |
1754 | return ret; | |
1755 | } | |
1756 | ||
ccd979bd | 1757 | static ssize_t ocfs2_file_aio_read(struct kiocb *iocb, |
027445c3 BP |
1758 | const struct iovec *iov, |
1759 | unsigned long nr_segs, | |
ccd979bd MF |
1760 | loff_t pos) |
1761 | { | |
25899dee | 1762 | int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0; |
ccd979bd | 1763 | struct file *filp = iocb->ki_filp; |
d28c9174 | 1764 | struct inode *inode = filp->f_path.dentry->d_inode; |
ccd979bd | 1765 | |
027445c3 BP |
1766 | mlog_entry("(0x%p, %u, '%.*s')\n", filp, |
1767 | (unsigned int)nr_segs, | |
d28c9174 JS |
1768 | filp->f_path.dentry->d_name.len, |
1769 | filp->f_path.dentry->d_name.name); | |
ccd979bd MF |
1770 | |
1771 | if (!inode) { | |
1772 | ret = -EINVAL; | |
1773 | mlog_errno(ret); | |
1774 | goto bail; | |
1775 | } | |
1776 | ||
ccd979bd MF |
1777 | /* |
1778 | * buffered reads protect themselves in ->readpage(). O_DIRECT reads | |
1779 | * need locks to protect pending reads from racing with truncate. | |
1780 | */ | |
1781 | if (filp->f_flags & O_DIRECT) { | |
1782 | down_read(&inode->i_alloc_sem); | |
1783 | have_alloc_sem = 1; | |
1784 | ||
1785 | ret = ocfs2_rw_lock(inode, 0); | |
1786 | if (ret < 0) { | |
1787 | mlog_errno(ret); | |
1788 | goto bail; | |
1789 | } | |
1790 | rw_level = 0; | |
1791 | /* communicate with ocfs2_dio_end_io */ | |
7cdfc3a1 | 1792 | ocfs2_iocb_set_rw_locked(iocb, rw_level); |
ccd979bd MF |
1793 | } |
1794 | ||
c4374f8a MF |
1795 | /* |
1796 | * We're fine letting folks race truncates and extending | |
1797 | * writes with read across the cluster, just like they can | |
1798 | * locally. Hence no rw_lock during read. | |
1799 | * | |
1800 | * Take and drop the meta data lock to update inode fields | |
1801 | * like i_size. This allows the checks down below | |
1802 | * generic_file_aio_read() a chance of actually working. | |
1803 | */ | |
25899dee | 1804 | ret = ocfs2_meta_lock_atime(inode, filp->f_vfsmnt, &lock_level); |
c4374f8a MF |
1805 | if (ret < 0) { |
1806 | mlog_errno(ret); | |
1807 | goto bail; | |
1808 | } | |
25899dee | 1809 | ocfs2_meta_unlock(inode, lock_level); |
c4374f8a | 1810 | |
027445c3 | 1811 | ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos); |
ccd979bd MF |
1812 | if (ret == -EINVAL) |
1813 | mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n"); | |
1814 | ||
1815 | /* buffered aio wouldn't have proper lock coverage today */ | |
1816 | BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT)); | |
1817 | ||
1818 | /* see ocfs2_file_aio_write */ | |
1819 | if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) { | |
1820 | rw_level = -1; | |
1821 | have_alloc_sem = 0; | |
1822 | } | |
1823 | ||
1824 | bail: | |
1825 | if (have_alloc_sem) | |
1826 | up_read(&inode->i_alloc_sem); | |
1827 | if (rw_level != -1) | |
1828 | ocfs2_rw_unlock(inode, rw_level); | |
1829 | mlog_exit(ret); | |
1830 | ||
1831 | return ret; | |
1832 | } | |
1833 | ||
92e1d5be | 1834 | const struct inode_operations ocfs2_file_iops = { |
ccd979bd MF |
1835 | .setattr = ocfs2_setattr, |
1836 | .getattr = ocfs2_getattr, | |
d38eb8db | 1837 | .permission = ocfs2_permission, |
ccd979bd MF |
1838 | }; |
1839 | ||
92e1d5be | 1840 | const struct inode_operations ocfs2_special_file_iops = { |
ccd979bd MF |
1841 | .setattr = ocfs2_setattr, |
1842 | .getattr = ocfs2_getattr, | |
d38eb8db | 1843 | .permission = ocfs2_permission, |
ccd979bd MF |
1844 | }; |
1845 | ||
4b6f5d20 | 1846 | const struct file_operations ocfs2_fops = { |
ccd979bd MF |
1847 | .read = do_sync_read, |
1848 | .write = do_sync_write, | |
1849 | .sendfile = generic_file_sendfile, | |
1850 | .mmap = ocfs2_mmap, | |
1851 | .fsync = ocfs2_sync_file, | |
1852 | .release = ocfs2_file_release, | |
1853 | .open = ocfs2_file_open, | |
1854 | .aio_read = ocfs2_file_aio_read, | |
1855 | .aio_write = ocfs2_file_aio_write, | |
ca4d147e | 1856 | .ioctl = ocfs2_ioctl, |
586d232b MF |
1857 | #ifdef CONFIG_COMPAT |
1858 | .compat_ioctl = ocfs2_compat_ioctl, | |
1859 | #endif | |
8659ac25 TY |
1860 | .splice_read = ocfs2_file_splice_read, |
1861 | .splice_write = ocfs2_file_splice_write, | |
ccd979bd MF |
1862 | }; |
1863 | ||
4b6f5d20 | 1864 | const struct file_operations ocfs2_dops = { |
ccd979bd MF |
1865 | .read = generic_read_dir, |
1866 | .readdir = ocfs2_readdir, | |
1867 | .fsync = ocfs2_sync_file, | |
ca4d147e | 1868 | .ioctl = ocfs2_ioctl, |
586d232b MF |
1869 | #ifdef CONFIG_COMPAT |
1870 | .compat_ioctl = ocfs2_compat_ioctl, | |
1871 | #endif | |
ccd979bd | 1872 | }; |