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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> |
d6b29d7c | 34 | #include <linux/splice.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 | 328 | |
ccd979bd MF |
329 | fe = (struct ocfs2_dinode *) di_bh->b_data; |
330 | if (!OCFS2_IS_VALID_DINODE(fe)) { | |
331 | OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); | |
332 | status = -EIO; | |
333 | goto bail; | |
334 | } | |
335 | ||
336 | mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode), | |
b0697053 MF |
337 | "Inode %llu, inode i_size = %lld != di " |
338 | "i_size = %llu, i_flags = 0x%x\n", | |
339 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd | 340 | i_size_read(inode), |
b0697053 MF |
341 | (unsigned long long)le64_to_cpu(fe->i_size), |
342 | le32_to_cpu(fe->i_flags)); | |
ccd979bd MF |
343 | |
344 | if (new_i_size > le64_to_cpu(fe->i_size)) { | |
b0697053 MF |
345 | mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n", |
346 | (unsigned long long)le64_to_cpu(fe->i_size), | |
347 | (unsigned long long)new_i_size); | |
ccd979bd MF |
348 | status = -EINVAL; |
349 | mlog_errno(status); | |
350 | goto bail; | |
351 | } | |
352 | ||
b0697053 MF |
353 | mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n", |
354 | (unsigned long long)le64_to_cpu(fe->i_blkno), | |
355 | (unsigned long long)le64_to_cpu(fe->i_size), | |
356 | (unsigned long long)new_i_size); | |
ccd979bd MF |
357 | |
358 | /* lets handle the simple truncate cases before doing any more | |
359 | * cluster locking. */ | |
360 | if (new_i_size == le64_to_cpu(fe->i_size)) | |
361 | goto bail; | |
362 | ||
2e89b2e4 MF |
363 | down_write(&OCFS2_I(inode)->ip_alloc_sem); |
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) { | |
2e89b2e4 MF |
371 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
372 | ||
ab0920ce MF |
373 | mlog_errno(status); |
374 | goto bail; | |
375 | } | |
ab0920ce | 376 | |
2e89b2e4 MF |
377 | unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1); |
378 | truncate_inode_pages(inode->i_mapping, new_i_size); | |
379 | ||
ccd979bd MF |
380 | /* alright, we're going to need to do a full blown alloc size |
381 | * change. Orphan the inode so that recovery can complete the | |
382 | * truncate if necessary. This does the task of marking | |
383 | * i_size. */ | |
384 | status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size); | |
385 | if (status < 0) { | |
386 | mlog_errno(status); | |
60b11392 | 387 | goto bail_unlock_data; |
ccd979bd MF |
388 | } |
389 | ||
390 | status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc); | |
391 | if (status < 0) { | |
392 | mlog_errno(status); | |
60b11392 | 393 | goto bail_unlock_data; |
ccd979bd MF |
394 | } |
395 | ||
396 | status = ocfs2_commit_truncate(osb, inode, di_bh, tc); | |
397 | if (status < 0) { | |
398 | mlog_errno(status); | |
60b11392 | 399 | goto bail_unlock_data; |
ccd979bd MF |
400 | } |
401 | ||
402 | /* TODO: orphan dir cleanup here. */ | |
60b11392 MF |
403 | bail_unlock_data: |
404 | ocfs2_data_unlock(inode, 1); | |
405 | ||
2e89b2e4 MF |
406 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
407 | ||
ccd979bd MF |
408 | bail: |
409 | ||
410 | mlog_exit(status); | |
411 | return status; | |
412 | } | |
413 | ||
414 | /* | |
415 | * extend allocation only here. | |
416 | * we'll update all the disk stuff, and oip->alloc_size | |
417 | * | |
418 | * expect stuff to be locked, a transaction started and enough data / | |
419 | * metadata reservations in the contexts. | |
420 | * | |
421 | * Will return -EAGAIN, and a reason if a restart is needed. | |
422 | * If passed in, *reason will always be set, even in error. | |
423 | */ | |
424 | int ocfs2_do_extend_allocation(struct ocfs2_super *osb, | |
425 | struct inode *inode, | |
dcd0538f | 426 | u32 *logical_offset, |
ccd979bd | 427 | u32 clusters_to_add, |
2ae99a60 | 428 | int mark_unwritten, |
ccd979bd | 429 | struct buffer_head *fe_bh, |
1fabe148 | 430 | handle_t *handle, |
ccd979bd MF |
431 | struct ocfs2_alloc_context *data_ac, |
432 | struct ocfs2_alloc_context *meta_ac, | |
433 | enum ocfs2_alloc_restarted *reason_ret) | |
434 | { | |
435 | int status = 0; | |
436 | int free_extents; | |
437 | struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data; | |
438 | enum ocfs2_alloc_restarted reason = RESTART_NONE; | |
439 | u32 bit_off, num_bits; | |
440 | u64 block; | |
2ae99a60 | 441 | u8 flags = 0; |
ccd979bd MF |
442 | |
443 | BUG_ON(!clusters_to_add); | |
444 | ||
2ae99a60 MF |
445 | if (mark_unwritten) |
446 | flags = OCFS2_EXT_UNWRITTEN; | |
447 | ||
ccd979bd MF |
448 | free_extents = ocfs2_num_free_extents(osb, inode, fe); |
449 | if (free_extents < 0) { | |
450 | status = free_extents; | |
451 | mlog_errno(status); | |
452 | goto leave; | |
453 | } | |
454 | ||
455 | /* there are two cases which could cause us to EAGAIN in the | |
456 | * we-need-more-metadata case: | |
457 | * 1) we haven't reserved *any* | |
458 | * 2) we are so fragmented, we've needed to add metadata too | |
459 | * many times. */ | |
460 | if (!free_extents && !meta_ac) { | |
461 | mlog(0, "we haven't reserved any metadata!\n"); | |
462 | status = -EAGAIN; | |
463 | reason = RESTART_META; | |
464 | goto leave; | |
465 | } else if ((!free_extents) | |
466 | && (ocfs2_alloc_context_bits_left(meta_ac) | |
467 | < ocfs2_extend_meta_needed(fe))) { | |
468 | mlog(0, "filesystem is really fragmented...\n"); | |
469 | status = -EAGAIN; | |
470 | reason = RESTART_META; | |
471 | goto leave; | |
472 | } | |
473 | ||
474 | status = ocfs2_claim_clusters(osb, handle, data_ac, 1, | |
475 | &bit_off, &num_bits); | |
476 | if (status < 0) { | |
477 | if (status != -ENOSPC) | |
478 | mlog_errno(status); | |
479 | goto leave; | |
480 | } | |
481 | ||
482 | BUG_ON(num_bits > clusters_to_add); | |
483 | ||
484 | /* reserve our write early -- insert_extent may update the inode */ | |
485 | status = ocfs2_journal_access(handle, inode, fe_bh, | |
486 | OCFS2_JOURNAL_ACCESS_WRITE); | |
487 | if (status < 0) { | |
488 | mlog_errno(status); | |
489 | goto leave; | |
490 | } | |
491 | ||
492 | block = ocfs2_clusters_to_blocks(osb->sb, bit_off); | |
b0697053 MF |
493 | mlog(0, "Allocating %u clusters at block %u for inode %llu\n", |
494 | num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
dcd0538f MF |
495 | status = ocfs2_insert_extent(osb, handle, inode, fe_bh, |
496 | *logical_offset, block, num_bits, | |
2ae99a60 | 497 | flags, meta_ac); |
ccd979bd MF |
498 | if (status < 0) { |
499 | mlog_errno(status); | |
500 | goto leave; | |
501 | } | |
502 | ||
ccd979bd MF |
503 | status = ocfs2_journal_dirty(handle, fe_bh); |
504 | if (status < 0) { | |
505 | mlog_errno(status); | |
506 | goto leave; | |
507 | } | |
508 | ||
509 | clusters_to_add -= num_bits; | |
dcd0538f | 510 | *logical_offset += num_bits; |
ccd979bd MF |
511 | |
512 | if (clusters_to_add) { | |
513 | mlog(0, "need to alloc once more, clusters = %u, wanted = " | |
514 | "%u\n", fe->i_clusters, clusters_to_add); | |
515 | status = -EAGAIN; | |
516 | reason = RESTART_TRANS; | |
517 | } | |
518 | ||
519 | leave: | |
520 | mlog_exit(status); | |
521 | if (reason_ret) | |
522 | *reason_ret = reason; | |
523 | return status; | |
524 | } | |
525 | ||
abf8b156 MF |
526 | /* |
527 | * For a given allocation, determine which allocators will need to be | |
528 | * accessed, and lock them, reserving the appropriate number of bits. | |
529 | * | |
2ae99a60 MF |
530 | * Sparse file systems call this from ocfs2_write_begin_nolock() |
531 | * and ocfs2_allocate_unwritten_extents(). | |
532 | * | |
533 | * File systems which don't support holes call this from | |
534 | * ocfs2_extend_allocation(). | |
abf8b156 | 535 | */ |
9517bac6 | 536 | int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_dinode *di, |
b27b7cbc | 537 | u32 clusters_to_add, u32 extents_to_split, |
9517bac6 MF |
538 | struct ocfs2_alloc_context **data_ac, |
539 | struct ocfs2_alloc_context **meta_ac) | |
abf8b156 MF |
540 | { |
541 | int ret, num_free_extents; | |
b27b7cbc | 542 | unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split; |
abf8b156 MF |
543 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
544 | ||
545 | *meta_ac = NULL; | |
546 | *data_ac = NULL; | |
547 | ||
548 | mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, " | |
b27b7cbc | 549 | "clusters_to_add = %u, extents_to_split = %u\n", |
abf8b156 | 550 | (unsigned long long)OCFS2_I(inode)->ip_blkno, i_size_read(inode), |
b27b7cbc | 551 | le32_to_cpu(di->i_clusters), clusters_to_add, extents_to_split); |
abf8b156 MF |
552 | |
553 | num_free_extents = ocfs2_num_free_extents(osb, inode, di); | |
554 | if (num_free_extents < 0) { | |
555 | ret = num_free_extents; | |
556 | mlog_errno(ret); | |
557 | goto out; | |
558 | } | |
559 | ||
560 | /* | |
561 | * Sparse allocation file systems need to be more conservative | |
562 | * with reserving room for expansion - the actual allocation | |
563 | * happens while we've got a journal handle open so re-taking | |
564 | * a cluster lock (because we ran out of room for another | |
565 | * extent) will violate ordering rules. | |
566 | * | |
9517bac6 | 567 | * Most of the time we'll only be seeing this 1 cluster at a time |
abf8b156 | 568 | * anyway. |
b27b7cbc MF |
569 | * |
570 | * Always lock for any unwritten extents - we might want to | |
571 | * add blocks during a split. | |
abf8b156 MF |
572 | */ |
573 | if (!num_free_extents || | |
b27b7cbc | 574 | (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) { |
abf8b156 MF |
575 | ret = ocfs2_reserve_new_metadata(osb, di, meta_ac); |
576 | if (ret < 0) { | |
577 | if (ret != -ENOSPC) | |
578 | mlog_errno(ret); | |
579 | goto out; | |
580 | } | |
581 | } | |
582 | ||
583 | ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac); | |
584 | if (ret < 0) { | |
585 | if (ret != -ENOSPC) | |
586 | mlog_errno(ret); | |
587 | goto out; | |
588 | } | |
589 | ||
590 | out: | |
591 | if (ret) { | |
592 | if (*meta_ac) { | |
593 | ocfs2_free_alloc_context(*meta_ac); | |
594 | *meta_ac = NULL; | |
595 | } | |
596 | ||
597 | /* | |
598 | * We cannot have an error and a non null *data_ac. | |
599 | */ | |
600 | } | |
601 | ||
602 | return ret; | |
603 | } | |
604 | ||
2ae99a60 MF |
605 | static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start, |
606 | u32 clusters_to_add, int mark_unwritten) | |
ccd979bd MF |
607 | { |
608 | int status = 0; | |
609 | int restart_func = 0; | |
abf8b156 | 610 | int credits; |
2ae99a60 | 611 | u32 prev_clusters; |
ccd979bd MF |
612 | struct buffer_head *bh = NULL; |
613 | struct ocfs2_dinode *fe = NULL; | |
1fabe148 | 614 | handle_t *handle = NULL; |
ccd979bd MF |
615 | struct ocfs2_alloc_context *data_ac = NULL; |
616 | struct ocfs2_alloc_context *meta_ac = NULL; | |
617 | enum ocfs2_alloc_restarted why; | |
618 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
619 | ||
620 | mlog_entry("(clusters_to_add = %u)\n", clusters_to_add); | |
621 | ||
dcd0538f MF |
622 | /* |
623 | * This function only exists for file systems which don't | |
624 | * support holes. | |
625 | */ | |
2ae99a60 | 626 | BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb)); |
dcd0538f | 627 | |
ccd979bd MF |
628 | status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh, |
629 | OCFS2_BH_CACHED, inode); | |
630 | if (status < 0) { | |
631 | mlog_errno(status); | |
632 | goto leave; | |
633 | } | |
634 | ||
635 | fe = (struct ocfs2_dinode *) bh->b_data; | |
636 | if (!OCFS2_IS_VALID_DINODE(fe)) { | |
637 | OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); | |
638 | status = -EIO; | |
639 | goto leave; | |
640 | } | |
641 | ||
642 | restart_all: | |
643 | BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters); | |
644 | ||
b27b7cbc | 645 | status = ocfs2_lock_allocators(inode, fe, clusters_to_add, 0, &data_ac, |
9517bac6 MF |
646 | &meta_ac); |
647 | if (status) { | |
648 | mlog_errno(status); | |
649 | goto leave; | |
650 | } | |
651 | ||
ccd979bd | 652 | credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add); |
65eff9cc | 653 | handle = ocfs2_start_trans(osb, credits); |
ccd979bd MF |
654 | if (IS_ERR(handle)) { |
655 | status = PTR_ERR(handle); | |
656 | handle = NULL; | |
657 | mlog_errno(status); | |
658 | goto leave; | |
659 | } | |
660 | ||
661 | restarted_transaction: | |
662 | /* reserve a write to the file entry early on - that we if we | |
663 | * run out of credits in the allocation path, we can still | |
664 | * update i_size. */ | |
665 | status = ocfs2_journal_access(handle, inode, bh, | |
666 | OCFS2_JOURNAL_ACCESS_WRITE); | |
667 | if (status < 0) { | |
668 | mlog_errno(status); | |
669 | goto leave; | |
670 | } | |
671 | ||
672 | prev_clusters = OCFS2_I(inode)->ip_clusters; | |
673 | ||
674 | status = ocfs2_do_extend_allocation(osb, | |
675 | inode, | |
dcd0538f | 676 | &logical_start, |
ccd979bd | 677 | clusters_to_add, |
2ae99a60 | 678 | mark_unwritten, |
ccd979bd MF |
679 | bh, |
680 | handle, | |
681 | data_ac, | |
682 | meta_ac, | |
683 | &why); | |
684 | if ((status < 0) && (status != -EAGAIN)) { | |
685 | if (status != -ENOSPC) | |
686 | mlog_errno(status); | |
687 | goto leave; | |
688 | } | |
689 | ||
690 | status = ocfs2_journal_dirty(handle, bh); | |
691 | if (status < 0) { | |
692 | mlog_errno(status); | |
693 | goto leave; | |
694 | } | |
695 | ||
696 | spin_lock(&OCFS2_I(inode)->ip_lock); | |
697 | clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters); | |
698 | spin_unlock(&OCFS2_I(inode)->ip_lock); | |
699 | ||
700 | if (why != RESTART_NONE && clusters_to_add) { | |
701 | if (why == RESTART_META) { | |
702 | mlog(0, "restarting function.\n"); | |
703 | restart_func = 1; | |
704 | } else { | |
705 | BUG_ON(why != RESTART_TRANS); | |
706 | ||
707 | mlog(0, "restarting transaction.\n"); | |
708 | /* TODO: This can be more intelligent. */ | |
709 | credits = ocfs2_calc_extend_credits(osb->sb, | |
710 | fe, | |
711 | clusters_to_add); | |
1fabe148 | 712 | status = ocfs2_extend_trans(handle, credits); |
ccd979bd MF |
713 | if (status < 0) { |
714 | /* handle still has to be committed at | |
715 | * this point. */ | |
716 | status = -ENOMEM; | |
717 | mlog_errno(status); | |
718 | goto leave; | |
719 | } | |
720 | goto restarted_transaction; | |
721 | } | |
722 | } | |
723 | ||
b0697053 | 724 | mlog(0, "fe: i_clusters = %u, i_size=%llu\n", |
1ca1a111 MF |
725 | le32_to_cpu(fe->i_clusters), |
726 | (unsigned long long)le64_to_cpu(fe->i_size)); | |
ccd979bd MF |
727 | mlog(0, "inode: ip_clusters=%u, i_size=%lld\n", |
728 | OCFS2_I(inode)->ip_clusters, i_size_read(inode)); | |
729 | ||
730 | leave: | |
ccd979bd | 731 | if (handle) { |
02dc1af4 | 732 | ocfs2_commit_trans(osb, handle); |
ccd979bd MF |
733 | handle = NULL; |
734 | } | |
735 | if (data_ac) { | |
736 | ocfs2_free_alloc_context(data_ac); | |
737 | data_ac = NULL; | |
738 | } | |
739 | if (meta_ac) { | |
740 | ocfs2_free_alloc_context(meta_ac); | |
741 | meta_ac = NULL; | |
742 | } | |
743 | if ((!status) && restart_func) { | |
744 | restart_func = 0; | |
745 | goto restart_all; | |
746 | } | |
747 | if (bh) { | |
748 | brelse(bh); | |
749 | bh = NULL; | |
750 | } | |
751 | ||
752 | mlog_exit(status); | |
753 | return status; | |
754 | } | |
755 | ||
2ae99a60 MF |
756 | static int ocfs2_extend_allocation(struct inode *inode, u32 logical_start, |
757 | u32 clusters_to_add, int mark_unwritten) | |
758 | { | |
759 | int ret; | |
760 | ||
761 | /* | |
762 | * The alloc sem blocks peope in read/write from reading our | |
763 | * allocation until we're done changing it. We depend on | |
764 | * i_mutex to block other extend/truncate calls while we're | |
765 | * here. | |
766 | */ | |
767 | down_write(&OCFS2_I(inode)->ip_alloc_sem); | |
768 | ret = __ocfs2_extend_allocation(inode, logical_start, clusters_to_add, | |
769 | mark_unwritten); | |
770 | up_write(&OCFS2_I(inode)->ip_alloc_sem); | |
771 | ||
772 | return ret; | |
773 | } | |
774 | ||
ccd979bd MF |
775 | /* Some parts of this taken from generic_cont_expand, which turned out |
776 | * to be too fragile to do exactly what we need without us having to | |
53013cba MF |
777 | * worry about recursive locking in ->prepare_write() and |
778 | * ->commit_write(). */ | |
ccd979bd MF |
779 | static int ocfs2_write_zero_page(struct inode *inode, |
780 | u64 size) | |
781 | { | |
782 | struct address_space *mapping = inode->i_mapping; | |
783 | struct page *page; | |
784 | unsigned long index; | |
785 | unsigned int offset; | |
1fabe148 | 786 | handle_t *handle = NULL; |
ccd979bd MF |
787 | int ret; |
788 | ||
789 | offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */ | |
790 | /* ugh. in prepare/commit_write, if from==to==start of block, we | |
791 | ** skip the prepare. make sure we never send an offset for the start | |
792 | ** of a block | |
793 | */ | |
794 | if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) { | |
795 | offset++; | |
796 | } | |
797 | index = size >> PAGE_CACHE_SHIFT; | |
798 | ||
799 | page = grab_cache_page(mapping, index); | |
800 | if (!page) { | |
801 | ret = -ENOMEM; | |
802 | mlog_errno(ret); | |
803 | goto out; | |
804 | } | |
805 | ||
53013cba | 806 | ret = ocfs2_prepare_write_nolock(inode, page, offset, offset); |
ccd979bd MF |
807 | if (ret < 0) { |
808 | mlog_errno(ret); | |
809 | goto out_unlock; | |
810 | } | |
811 | ||
812 | if (ocfs2_should_order_data(inode)) { | |
813 | handle = ocfs2_start_walk_page_trans(inode, page, offset, | |
814 | offset); | |
815 | if (IS_ERR(handle)) { | |
816 | ret = PTR_ERR(handle); | |
817 | handle = NULL; | |
818 | goto out_unlock; | |
819 | } | |
820 | } | |
821 | ||
822 | /* must not update i_size! */ | |
823 | ret = block_commit_write(page, offset, offset); | |
824 | if (ret < 0) | |
825 | mlog_errno(ret); | |
826 | else | |
827 | ret = 0; | |
828 | ||
829 | if (handle) | |
02dc1af4 | 830 | ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); |
ccd979bd MF |
831 | out_unlock: |
832 | unlock_page(page); | |
833 | page_cache_release(page); | |
834 | out: | |
835 | return ret; | |
836 | } | |
837 | ||
838 | static int ocfs2_zero_extend(struct inode *inode, | |
839 | u64 zero_to_size) | |
840 | { | |
841 | int ret = 0; | |
842 | u64 start_off; | |
843 | struct super_block *sb = inode->i_sb; | |
844 | ||
845 | start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode)); | |
846 | while (start_off < zero_to_size) { | |
847 | ret = ocfs2_write_zero_page(inode, start_off); | |
848 | if (ret < 0) { | |
849 | mlog_errno(ret); | |
850 | goto out; | |
851 | } | |
852 | ||
853 | start_off += sb->s_blocksize; | |
e2057c5a MF |
854 | |
855 | /* | |
856 | * Very large extends have the potential to lock up | |
857 | * the cpu for extended periods of time. | |
858 | */ | |
859 | cond_resched(); | |
ccd979bd MF |
860 | } |
861 | ||
862 | out: | |
863 | return ret; | |
864 | } | |
865 | ||
53013cba MF |
866 | /* |
867 | * A tail_to_skip value > 0 indicates that we're being called from | |
868 | * ocfs2_file_aio_write(). This has the following implications: | |
869 | * | |
870 | * - we don't want to update i_size | |
871 | * - di_bh will be NULL, which is fine because it's only used in the | |
872 | * case where we want to update i_size. | |
873 | * - ocfs2_zero_extend() will then only be filling the hole created | |
874 | * between i_size and the start of the write. | |
875 | */ | |
ccd979bd MF |
876 | static int ocfs2_extend_file(struct inode *inode, |
877 | struct buffer_head *di_bh, | |
53013cba MF |
878 | u64 new_i_size, |
879 | size_t tail_to_skip) | |
ccd979bd MF |
880 | { |
881 | int ret = 0; | |
3a0782d0 | 882 | u32 clusters_to_add = 0; |
ccd979bd | 883 | |
53013cba MF |
884 | BUG_ON(!tail_to_skip && !di_bh); |
885 | ||
ccd979bd MF |
886 | /* setattr sometimes calls us like this. */ |
887 | if (new_i_size == 0) | |
888 | goto out; | |
889 | ||
890 | if (i_size_read(inode) == new_i_size) | |
891 | goto out; | |
892 | BUG_ON(new_i_size < i_size_read(inode)); | |
893 | ||
3a0782d0 MF |
894 | if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) { |
895 | BUG_ON(tail_to_skip != 0); | |
896 | goto out_update_size; | |
897 | } | |
898 | ||
ccd979bd MF |
899 | clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size) - |
900 | OCFS2_I(inode)->ip_clusters; | |
901 | ||
0effef77 MF |
902 | /* |
903 | * protect the pages that ocfs2_zero_extend is going to be | |
904 | * pulling into the page cache.. we do this before the | |
905 | * metadata extend so that we don't get into the situation | |
906 | * where we've extended the metadata but can't get the data | |
907 | * lock to zero. | |
908 | */ | |
909 | ret = ocfs2_data_lock(inode, 1); | |
910 | if (ret < 0) { | |
911 | mlog_errno(ret); | |
912 | goto out; | |
913 | } | |
ccd979bd | 914 | |
0effef77 | 915 | if (clusters_to_add) { |
2ae99a60 MF |
916 | ret = ocfs2_extend_allocation(inode, |
917 | OCFS2_I(inode)->ip_clusters, | |
918 | clusters_to_add, 0); | |
ccd979bd MF |
919 | if (ret < 0) { |
920 | mlog_errno(ret); | |
53013cba | 921 | goto out_unlock; |
ccd979bd | 922 | } |
0effef77 | 923 | } |
ccd979bd | 924 | |
0effef77 MF |
925 | /* |
926 | * Call this even if we don't add any clusters to the tree. We | |
927 | * still need to zero the area between the old i_size and the | |
928 | * new i_size. | |
929 | */ | |
930 | ret = ocfs2_zero_extend(inode, (u64)new_i_size - tail_to_skip); | |
931 | if (ret < 0) { | |
932 | mlog_errno(ret); | |
933 | goto out_unlock; | |
53013cba MF |
934 | } |
935 | ||
3a0782d0 | 936 | out_update_size: |
53013cba MF |
937 | if (!tail_to_skip) { |
938 | /* We're being called from ocfs2_setattr() which wants | |
939 | * us to update i_size */ | |
940 | ret = ocfs2_simple_size_update(inode, di_bh, new_i_size); | |
941 | if (ret < 0) | |
942 | mlog_errno(ret); | |
ccd979bd MF |
943 | } |
944 | ||
53013cba | 945 | out_unlock: |
3a0782d0 MF |
946 | if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) |
947 | ocfs2_data_unlock(inode, 1); | |
53013cba | 948 | |
ccd979bd MF |
949 | out: |
950 | return ret; | |
951 | } | |
952 | ||
953 | int ocfs2_setattr(struct dentry *dentry, struct iattr *attr) | |
954 | { | |
955 | int status = 0, size_change; | |
956 | struct inode *inode = dentry->d_inode; | |
957 | struct super_block *sb = inode->i_sb; | |
958 | struct ocfs2_super *osb = OCFS2_SB(sb); | |
959 | struct buffer_head *bh = NULL; | |
1fabe148 | 960 | handle_t *handle = NULL; |
ccd979bd MF |
961 | |
962 | mlog_entry("(0x%p, '%.*s')\n", dentry, | |
963 | dentry->d_name.len, dentry->d_name.name); | |
964 | ||
965 | if (attr->ia_valid & ATTR_MODE) | |
966 | mlog(0, "mode change: %d\n", attr->ia_mode); | |
967 | if (attr->ia_valid & ATTR_UID) | |
968 | mlog(0, "uid change: %d\n", attr->ia_uid); | |
969 | if (attr->ia_valid & ATTR_GID) | |
970 | mlog(0, "gid change: %d\n", attr->ia_gid); | |
971 | if (attr->ia_valid & ATTR_SIZE) | |
972 | mlog(0, "size change...\n"); | |
973 | if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME)) | |
974 | mlog(0, "time change...\n"); | |
975 | ||
976 | #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \ | |
977 | | ATTR_GID | ATTR_UID | ATTR_MODE) | |
978 | if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) { | |
979 | mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid); | |
980 | return 0; | |
981 | } | |
982 | ||
983 | status = inode_change_ok(inode, attr); | |
984 | if (status) | |
985 | return status; | |
986 | ||
987 | size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE; | |
988 | if (size_change) { | |
989 | status = ocfs2_rw_lock(inode, 1); | |
990 | if (status < 0) { | |
991 | mlog_errno(status); | |
992 | goto bail; | |
993 | } | |
994 | } | |
995 | ||
4bcec184 | 996 | status = ocfs2_meta_lock(inode, &bh, 1); |
ccd979bd MF |
997 | if (status < 0) { |
998 | if (status != -ENOENT) | |
999 | mlog_errno(status); | |
1000 | goto bail_unlock_rw; | |
1001 | } | |
1002 | ||
1003 | if (size_change && attr->ia_size != i_size_read(inode)) { | |
1004 | if (i_size_read(inode) > attr->ia_size) | |
1005 | status = ocfs2_truncate_file(inode, bh, attr->ia_size); | |
1006 | else | |
53013cba | 1007 | status = ocfs2_extend_file(inode, bh, attr->ia_size, 0); |
ccd979bd MF |
1008 | if (status < 0) { |
1009 | if (status != -ENOSPC) | |
1010 | mlog_errno(status); | |
1011 | status = -ENOSPC; | |
1012 | goto bail_unlock; | |
1013 | } | |
1014 | } | |
1015 | ||
65eff9cc | 1016 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
ccd979bd MF |
1017 | if (IS_ERR(handle)) { |
1018 | status = PTR_ERR(handle); | |
1019 | mlog_errno(status); | |
1020 | goto bail_unlock; | |
1021 | } | |
1022 | ||
7307de80 MF |
1023 | /* |
1024 | * This will intentionally not wind up calling vmtruncate(), | |
1025 | * since all the work for a size change has been done above. | |
1026 | * Otherwise, we could get into problems with truncate as | |
1027 | * ip_alloc_sem is used there to protect against i_size | |
1028 | * changes. | |
1029 | */ | |
ccd979bd MF |
1030 | status = inode_setattr(inode, attr); |
1031 | if (status < 0) { | |
1032 | mlog_errno(status); | |
1033 | goto bail_commit; | |
1034 | } | |
1035 | ||
1036 | status = ocfs2_mark_inode_dirty(handle, inode, bh); | |
1037 | if (status < 0) | |
1038 | mlog_errno(status); | |
1039 | ||
1040 | bail_commit: | |
02dc1af4 | 1041 | ocfs2_commit_trans(osb, handle); |
ccd979bd MF |
1042 | bail_unlock: |
1043 | ocfs2_meta_unlock(inode, 1); | |
1044 | bail_unlock_rw: | |
1045 | if (size_change) | |
1046 | ocfs2_rw_unlock(inode, 1); | |
1047 | bail: | |
1048 | if (bh) | |
1049 | brelse(bh); | |
1050 | ||
1051 | mlog_exit(status); | |
1052 | return status; | |
1053 | } | |
1054 | ||
1055 | int ocfs2_getattr(struct vfsmount *mnt, | |
1056 | struct dentry *dentry, | |
1057 | struct kstat *stat) | |
1058 | { | |
1059 | struct inode *inode = dentry->d_inode; | |
1060 | struct super_block *sb = dentry->d_inode->i_sb; | |
1061 | struct ocfs2_super *osb = sb->s_fs_info; | |
1062 | int err; | |
1063 | ||
1064 | mlog_entry_void(); | |
1065 | ||
1066 | err = ocfs2_inode_revalidate(dentry); | |
1067 | if (err) { | |
1068 | if (err != -ENOENT) | |
1069 | mlog_errno(err); | |
1070 | goto bail; | |
1071 | } | |
1072 | ||
1073 | generic_fillattr(inode, stat); | |
1074 | ||
1075 | /* We set the blksize from the cluster size for performance */ | |
1076 | stat->blksize = osb->s_clustersize; | |
1077 | ||
1078 | bail: | |
1079 | mlog_exit(err); | |
1080 | ||
1081 | return err; | |
1082 | } | |
1083 | ||
d38eb8db TY |
1084 | int ocfs2_permission(struct inode *inode, int mask, struct nameidata *nd) |
1085 | { | |
1086 | int ret; | |
1087 | ||
1088 | mlog_entry_void(); | |
1089 | ||
1090 | ret = ocfs2_meta_lock(inode, NULL, 0); | |
1091 | if (ret) { | |
a9f5f707 MF |
1092 | if (ret != -ENOENT) |
1093 | mlog_errno(ret); | |
d38eb8db TY |
1094 | goto out; |
1095 | } | |
1096 | ||
1097 | ret = generic_permission(inode, mask, NULL); | |
d38eb8db TY |
1098 | |
1099 | ocfs2_meta_unlock(inode, 0); | |
1100 | out: | |
1101 | mlog_exit(ret); | |
1102 | return ret; | |
1103 | } | |
1104 | ||
ccd979bd MF |
1105 | static int ocfs2_write_remove_suid(struct inode *inode) |
1106 | { | |
1107 | int ret; | |
1108 | struct buffer_head *bh = NULL; | |
1109 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
1fabe148 | 1110 | handle_t *handle; |
ccd979bd MF |
1111 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
1112 | struct ocfs2_dinode *di; | |
1113 | ||
b0697053 MF |
1114 | mlog_entry("(Inode %llu, mode 0%o)\n", |
1115 | (unsigned long long)oi->ip_blkno, inode->i_mode); | |
ccd979bd | 1116 | |
65eff9cc | 1117 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
ccd979bd MF |
1118 | if (handle == NULL) { |
1119 | ret = -ENOMEM; | |
1120 | mlog_errno(ret); | |
1121 | goto out; | |
1122 | } | |
1123 | ||
1124 | ret = ocfs2_read_block(osb, oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode); | |
1125 | if (ret < 0) { | |
1126 | mlog_errno(ret); | |
1127 | goto out_trans; | |
1128 | } | |
1129 | ||
1130 | ret = ocfs2_journal_access(handle, inode, bh, | |
1131 | OCFS2_JOURNAL_ACCESS_WRITE); | |
1132 | if (ret < 0) { | |
1133 | mlog_errno(ret); | |
1134 | goto out_bh; | |
1135 | } | |
1136 | ||
1137 | inode->i_mode &= ~S_ISUID; | |
1138 | if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP)) | |
1139 | inode->i_mode &= ~S_ISGID; | |
1140 | ||
1141 | di = (struct ocfs2_dinode *) bh->b_data; | |
1142 | di->i_mode = cpu_to_le16(inode->i_mode); | |
1143 | ||
1144 | ret = ocfs2_journal_dirty(handle, bh); | |
1145 | if (ret < 0) | |
1146 | mlog_errno(ret); | |
1147 | out_bh: | |
1148 | brelse(bh); | |
1149 | out_trans: | |
02dc1af4 | 1150 | ocfs2_commit_trans(osb, handle); |
ccd979bd MF |
1151 | out: |
1152 | mlog_exit(ret); | |
1153 | return ret; | |
1154 | } | |
1155 | ||
9517bac6 MF |
1156 | /* |
1157 | * Will look for holes and unwritten extents in the range starting at | |
1158 | * pos for count bytes (inclusive). | |
1159 | */ | |
1160 | static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos, | |
1161 | size_t count) | |
1162 | { | |
1163 | int ret = 0; | |
49cb8d2d | 1164 | unsigned int extent_flags; |
9517bac6 MF |
1165 | u32 cpos, clusters, extent_len, phys_cpos; |
1166 | struct super_block *sb = inode->i_sb; | |
1167 | ||
1168 | cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits; | |
1169 | clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos; | |
1170 | ||
1171 | while (clusters) { | |
49cb8d2d MF |
1172 | ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len, |
1173 | &extent_flags); | |
9517bac6 MF |
1174 | if (ret < 0) { |
1175 | mlog_errno(ret); | |
1176 | goto out; | |
1177 | } | |
1178 | ||
49cb8d2d | 1179 | if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) { |
9517bac6 MF |
1180 | ret = 1; |
1181 | break; | |
1182 | } | |
1183 | ||
1184 | if (extent_len > clusters) | |
1185 | extent_len = clusters; | |
1186 | ||
1187 | clusters -= extent_len; | |
1188 | cpos += extent_len; | |
1189 | } | |
1190 | out: | |
1191 | return ret; | |
1192 | } | |
1193 | ||
2ae99a60 MF |
1194 | /* |
1195 | * Allocate enough extents to cover the region starting at byte offset | |
1196 | * start for len bytes. Existing extents are skipped, any extents | |
1197 | * added are marked as "unwritten". | |
1198 | */ | |
1199 | static int ocfs2_allocate_unwritten_extents(struct inode *inode, | |
1200 | u64 start, u64 len) | |
1201 | { | |
1202 | int ret; | |
1203 | u32 cpos, phys_cpos, clusters, alloc_size; | |
1204 | ||
1205 | /* | |
1206 | * We consider both start and len to be inclusive. | |
1207 | */ | |
1208 | cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits; | |
1209 | clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len); | |
1210 | clusters -= cpos; | |
1211 | ||
1212 | while (clusters) { | |
1213 | ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, | |
1214 | &alloc_size, NULL); | |
1215 | if (ret) { | |
1216 | mlog_errno(ret); | |
1217 | goto out; | |
1218 | } | |
1219 | ||
1220 | /* | |
1221 | * Hole or existing extent len can be arbitrary, so | |
1222 | * cap it to our own allocation request. | |
1223 | */ | |
1224 | if (alloc_size > clusters) | |
1225 | alloc_size = clusters; | |
1226 | ||
1227 | if (phys_cpos) { | |
1228 | /* | |
1229 | * We already have an allocation at this | |
1230 | * region so we can safely skip it. | |
1231 | */ | |
1232 | goto next; | |
1233 | } | |
1234 | ||
1235 | ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1); | |
1236 | if (ret) { | |
1237 | if (ret != -ENOSPC) | |
1238 | mlog_errno(ret); | |
1239 | goto out; | |
1240 | } | |
1241 | ||
1242 | next: | |
1243 | cpos += alloc_size; | |
1244 | clusters -= alloc_size; | |
1245 | } | |
1246 | ||
1247 | ret = 0; | |
1248 | out: | |
1249 | return ret; | |
1250 | } | |
1251 | ||
8659ac25 TY |
1252 | static int ocfs2_prepare_inode_for_write(struct dentry *dentry, |
1253 | loff_t *ppos, | |
1254 | size_t count, | |
9517bac6 MF |
1255 | int appending, |
1256 | int *direct_io) | |
ccd979bd | 1257 | { |
8659ac25 TY |
1258 | int ret = 0, meta_level = appending; |
1259 | struct inode *inode = dentry->d_inode; | |
ccd979bd | 1260 | u32 clusters; |
ccd979bd | 1261 | loff_t newsize, saved_pos; |
ccd979bd | 1262 | |
ccd979bd MF |
1263 | /* |
1264 | * We sample i_size under a read level meta lock to see if our write | |
1265 | * is extending the file, if it is we back off and get a write level | |
1266 | * meta lock. | |
1267 | */ | |
ccd979bd | 1268 | for(;;) { |
4bcec184 | 1269 | ret = ocfs2_meta_lock(inode, NULL, meta_level); |
ccd979bd MF |
1270 | if (ret < 0) { |
1271 | meta_level = -1; | |
1272 | mlog_errno(ret); | |
1273 | goto out; | |
1274 | } | |
1275 | ||
1276 | /* Clear suid / sgid if necessary. We do this here | |
1277 | * instead of later in the write path because | |
1278 | * remove_suid() calls ->setattr without any hint that | |
1279 | * we may have already done our cluster locking. Since | |
1280 | * ocfs2_setattr() *must* take cluster locks to | |
1281 | * proceeed, this will lead us to recursively lock the | |
1282 | * inode. There's also the dinode i_size state which | |
1283 | * can be lost via setattr during extending writes (we | |
1284 | * set inode->i_size at the end of a write. */ | |
8659ac25 | 1285 | if (should_remove_suid(dentry)) { |
ccd979bd MF |
1286 | if (meta_level == 0) { |
1287 | ocfs2_meta_unlock(inode, meta_level); | |
1288 | meta_level = 1; | |
1289 | continue; | |
1290 | } | |
1291 | ||
1292 | ret = ocfs2_write_remove_suid(inode); | |
1293 | if (ret < 0) { | |
1294 | mlog_errno(ret); | |
8659ac25 | 1295 | goto out_unlock; |
ccd979bd MF |
1296 | } |
1297 | } | |
1298 | ||
1299 | /* work on a copy of ppos until we're sure that we won't have | |
1300 | * to recalculate it due to relocking. */ | |
8659ac25 | 1301 | if (appending) { |
ccd979bd MF |
1302 | saved_pos = i_size_read(inode); |
1303 | mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos); | |
1304 | } else { | |
8659ac25 | 1305 | saved_pos = *ppos; |
ccd979bd | 1306 | } |
3a0782d0 | 1307 | |
9517bac6 MF |
1308 | if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) { |
1309 | loff_t end = saved_pos + count; | |
1310 | ||
1311 | /* | |
1312 | * Skip the O_DIRECT checks if we don't need | |
1313 | * them. | |
1314 | */ | |
1315 | if (!direct_io || !(*direct_io)) | |
1316 | break; | |
1317 | ||
1318 | /* | |
1319 | * Allowing concurrent direct writes means | |
1320 | * i_size changes wouldn't be synchronized, so | |
1321 | * one node could wind up truncating another | |
1322 | * nodes writes. | |
1323 | */ | |
1324 | if (end > i_size_read(inode)) { | |
1325 | *direct_io = 0; | |
1326 | break; | |
1327 | } | |
1328 | ||
1329 | /* | |
1330 | * We don't fill holes during direct io, so | |
1331 | * check for them here. If any are found, the | |
1332 | * caller will have to retake some cluster | |
1333 | * locks and initiate the io as buffered. | |
1334 | */ | |
1335 | ret = ocfs2_check_range_for_holes(inode, saved_pos, | |
1336 | count); | |
1337 | if (ret == 1) { | |
1338 | *direct_io = 0; | |
1339 | ret = 0; | |
1340 | } else if (ret < 0) | |
1341 | mlog_errno(ret); | |
1342 | break; | |
1343 | } | |
1344 | ||
3a0782d0 MF |
1345 | /* |
1346 | * The rest of this loop is concerned with legacy file | |
1347 | * systems which don't support sparse files. | |
1348 | */ | |
3a0782d0 | 1349 | |
8659ac25 | 1350 | newsize = count + saved_pos; |
ccd979bd | 1351 | |
215c7f9f MF |
1352 | mlog(0, "pos=%lld newsize=%lld cursize=%lld\n", |
1353 | (long long) saved_pos, (long long) newsize, | |
1354 | (long long) i_size_read(inode)); | |
ccd979bd MF |
1355 | |
1356 | /* No need for a higher level metadata lock if we're | |
1357 | * never going past i_size. */ | |
1358 | if (newsize <= i_size_read(inode)) | |
1359 | break; | |
1360 | ||
1361 | if (meta_level == 0) { | |
1362 | ocfs2_meta_unlock(inode, meta_level); | |
1363 | meta_level = 1; | |
1364 | continue; | |
1365 | } | |
1366 | ||
1367 | spin_lock(&OCFS2_I(inode)->ip_lock); | |
1368 | clusters = ocfs2_clusters_for_bytes(inode->i_sb, newsize) - | |
1369 | OCFS2_I(inode)->ip_clusters; | |
1370 | spin_unlock(&OCFS2_I(inode)->ip_lock); | |
1371 | ||
1372 | mlog(0, "Writing at EOF, may need more allocation: " | |
215c7f9f MF |
1373 | "i_size = %lld, newsize = %lld, need %u clusters\n", |
1374 | (long long) i_size_read(inode), (long long) newsize, | |
1375 | clusters); | |
ccd979bd MF |
1376 | |
1377 | /* We only want to continue the rest of this loop if | |
1378 | * our extend will actually require more | |
1379 | * allocation. */ | |
1380 | if (!clusters) | |
1381 | break; | |
1382 | ||
8659ac25 | 1383 | ret = ocfs2_extend_file(inode, NULL, newsize, count); |
ccd979bd MF |
1384 | if (ret < 0) { |
1385 | if (ret != -ENOSPC) | |
1386 | mlog_errno(ret); | |
8659ac25 | 1387 | goto out_unlock; |
ccd979bd | 1388 | } |
ccd979bd MF |
1389 | break; |
1390 | } | |
1391 | ||
8659ac25 TY |
1392 | if (appending) |
1393 | *ppos = saved_pos; | |
1394 | ||
1395 | out_unlock: | |
ccd979bd | 1396 | ocfs2_meta_unlock(inode, meta_level); |
8659ac25 TY |
1397 | |
1398 | out: | |
1399 | return ret; | |
1400 | } | |
1401 | ||
9517bac6 MF |
1402 | static inline void |
1403 | ocfs2_set_next_iovec(const struct iovec **iovp, size_t *basep, size_t bytes) | |
1404 | { | |
1405 | const struct iovec *iov = *iovp; | |
1406 | size_t base = *basep; | |
1407 | ||
1408 | do { | |
1409 | int copy = min(bytes, iov->iov_len - base); | |
1410 | ||
1411 | bytes -= copy; | |
1412 | base += copy; | |
1413 | if (iov->iov_len == base) { | |
1414 | iov++; | |
1415 | base = 0; | |
1416 | } | |
1417 | } while (bytes); | |
1418 | *iovp = iov; | |
1419 | *basep = base; | |
1420 | } | |
1421 | ||
3a307ffc | 1422 | static struct page * ocfs2_get_write_source(char **ret_src_buf, |
9517bac6 MF |
1423 | const struct iovec *cur_iov, |
1424 | size_t iov_offset) | |
1425 | { | |
1426 | int ret; | |
3a307ffc | 1427 | char *buf = cur_iov->iov_base + iov_offset; |
9517bac6 | 1428 | struct page *src_page = NULL; |
3a307ffc | 1429 | unsigned long off; |
9517bac6 | 1430 | |
3a307ffc | 1431 | off = (unsigned long)(buf) & ~PAGE_CACHE_MASK; |
9517bac6 MF |
1432 | |
1433 | if (!segment_eq(get_fs(), KERNEL_DS)) { | |
1434 | /* | |
1435 | * Pull in the user page. We want to do this outside | |
1436 | * of the meta data locks in order to preserve locking | |
1437 | * order in case of page fault. | |
1438 | */ | |
1439 | ret = get_user_pages(current, current->mm, | |
1440 | (unsigned long)buf & PAGE_CACHE_MASK, 1, | |
1441 | 0, 0, &src_page, NULL); | |
1442 | if (ret == 1) | |
3a307ffc | 1443 | *ret_src_buf = kmap(src_page) + off; |
9517bac6 MF |
1444 | else |
1445 | src_page = ERR_PTR(-EFAULT); | |
1446 | } else { | |
3a307ffc | 1447 | *ret_src_buf = buf; |
9517bac6 MF |
1448 | } |
1449 | ||
1450 | return src_page; | |
1451 | } | |
1452 | ||
3a307ffc | 1453 | static void ocfs2_put_write_source(struct page *page) |
9517bac6 MF |
1454 | { |
1455 | if (page) { | |
1456 | kunmap(page); | |
1457 | page_cache_release(page); | |
1458 | } | |
1459 | } | |
1460 | ||
1461 | static ssize_t ocfs2_file_buffered_write(struct file *file, loff_t *ppos, | |
1462 | const struct iovec *iov, | |
1463 | unsigned long nr_segs, | |
1464 | size_t count, | |
1465 | ssize_t o_direct_written) | |
1466 | { | |
1467 | int ret = 0; | |
1468 | ssize_t copied, total = 0; | |
3a307ffc MF |
1469 | size_t iov_offset = 0, bytes; |
1470 | loff_t pos; | |
9517bac6 | 1471 | const struct iovec *cur_iov = iov; |
3a307ffc MF |
1472 | struct page *user_page, *page; |
1473 | char *buf, *dst; | |
1474 | void *fsdata; | |
9517bac6 MF |
1475 | |
1476 | /* | |
1477 | * handle partial DIO write. Adjust cur_iov if needed. | |
1478 | */ | |
1479 | ocfs2_set_next_iovec(&cur_iov, &iov_offset, o_direct_written); | |
1480 | ||
1481 | do { | |
3a307ffc | 1482 | pos = *ppos; |
9517bac6 | 1483 | |
3a307ffc MF |
1484 | user_page = ocfs2_get_write_source(&buf, cur_iov, iov_offset); |
1485 | if (IS_ERR(user_page)) { | |
1486 | ret = PTR_ERR(user_page); | |
9517bac6 MF |
1487 | goto out; |
1488 | } | |
1489 | ||
3a307ffc MF |
1490 | /* Stay within our page boundaries */ |
1491 | bytes = min((PAGE_CACHE_SIZE - ((unsigned long)pos & ~PAGE_CACHE_MASK)), | |
1492 | (PAGE_CACHE_SIZE - ((unsigned long)buf & ~PAGE_CACHE_MASK))); | |
1493 | /* Stay within the vector boundary */ | |
1494 | bytes = min_t(size_t, bytes, cur_iov->iov_len - iov_offset); | |
1495 | /* Stay within count */ | |
1496 | bytes = min(bytes, count); | |
1497 | ||
1498 | page = NULL; | |
1499 | ret = ocfs2_write_begin(file, file->f_mapping, pos, bytes, 0, | |
1500 | &page, &fsdata); | |
1501 | if (ret) { | |
1502 | mlog_errno(ret); | |
1503 | goto out; | |
1504 | } | |
9517bac6 | 1505 | |
3a307ffc MF |
1506 | dst = kmap_atomic(page, KM_USER0); |
1507 | memcpy(dst + (pos & (PAGE_CACHE_SIZE - 1)), buf, bytes); | |
1508 | kunmap_atomic(dst, KM_USER0); | |
1509 | flush_dcache_page(page); | |
1510 | ocfs2_put_write_source(user_page); | |
9517bac6 | 1511 | |
3a307ffc MF |
1512 | copied = ocfs2_write_end(file, file->f_mapping, pos, bytes, |
1513 | bytes, page, fsdata); | |
9517bac6 MF |
1514 | if (copied < 0) { |
1515 | mlog_errno(copied); | |
1516 | ret = copied; | |
1517 | goto out; | |
1518 | } | |
1519 | ||
1520 | total += copied; | |
3a307ffc | 1521 | *ppos = pos + copied; |
9517bac6 MF |
1522 | count -= copied; |
1523 | ||
1524 | ocfs2_set_next_iovec(&cur_iov, &iov_offset, copied); | |
1525 | } while(count); | |
1526 | ||
1527 | out: | |
1528 | return total ? total : ret; | |
1529 | } | |
1530 | ||
8659ac25 TY |
1531 | static ssize_t ocfs2_file_aio_write(struct kiocb *iocb, |
1532 | const struct iovec *iov, | |
1533 | unsigned long nr_segs, | |
1534 | loff_t pos) | |
1535 | { | |
9517bac6 MF |
1536 | int ret, direct_io, appending, rw_level, have_alloc_sem = 0; |
1537 | int can_do_direct, sync = 0; | |
1538 | ssize_t written = 0; | |
1539 | size_t ocount; /* original count */ | |
1540 | size_t count; /* after file limit checks */ | |
1541 | loff_t *ppos = &iocb->ki_pos; | |
1542 | struct file *file = iocb->ki_filp; | |
1543 | struct inode *inode = file->f_path.dentry->d_inode; | |
1544 | ||
1545 | mlog_entry("(0x%p, %u, '%.*s')\n", file, | |
8659ac25 | 1546 | (unsigned int)nr_segs, |
9517bac6 MF |
1547 | file->f_path.dentry->d_name.len, |
1548 | file->f_path.dentry->d_name.name); | |
8659ac25 | 1549 | |
8659ac25 TY |
1550 | if (iocb->ki_left == 0) |
1551 | return 0; | |
1552 | ||
d9b08b9e | 1553 | ret = generic_segment_checks(iov, &nr_segs, &ocount, VERIFY_READ); |
9517bac6 MF |
1554 | if (ret) |
1555 | return ret; | |
1556 | ||
1557 | count = ocount; | |
1558 | ||
1559 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); | |
1560 | ||
1561 | appending = file->f_flags & O_APPEND ? 1 : 0; | |
1562 | direct_io = file->f_flags & O_DIRECT ? 1 : 0; | |
1563 | ||
8659ac25 | 1564 | mutex_lock(&inode->i_mutex); |
9517bac6 MF |
1565 | |
1566 | relock: | |
8659ac25 | 1567 | /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */ |
9517bac6 | 1568 | if (direct_io) { |
8659ac25 | 1569 | down_read(&inode->i_alloc_sem); |
9517bac6 | 1570 | have_alloc_sem = 1; |
8659ac25 TY |
1571 | } |
1572 | ||
1573 | /* concurrent O_DIRECT writes are allowed */ | |
9517bac6 | 1574 | rw_level = !direct_io; |
8659ac25 TY |
1575 | ret = ocfs2_rw_lock(inode, rw_level); |
1576 | if (ret < 0) { | |
8659ac25 | 1577 | mlog_errno(ret); |
9517bac6 | 1578 | goto out_sems; |
8659ac25 TY |
1579 | } |
1580 | ||
9517bac6 MF |
1581 | can_do_direct = direct_io; |
1582 | ret = ocfs2_prepare_inode_for_write(file->f_path.dentry, ppos, | |
1583 | iocb->ki_left, appending, | |
1584 | &can_do_direct); | |
8659ac25 TY |
1585 | if (ret < 0) { |
1586 | mlog_errno(ret); | |
1587 | goto out; | |
1588 | } | |
ccd979bd | 1589 | |
9517bac6 MF |
1590 | /* |
1591 | * We can't complete the direct I/O as requested, fall back to | |
1592 | * buffered I/O. | |
1593 | */ | |
1594 | if (direct_io && !can_do_direct) { | |
1595 | ocfs2_rw_unlock(inode, rw_level); | |
1596 | up_read(&inode->i_alloc_sem); | |
1597 | ||
1598 | have_alloc_sem = 0; | |
1599 | rw_level = -1; | |
1600 | ||
1601 | direct_io = 0; | |
1602 | sync = 1; | |
1603 | goto relock; | |
1604 | } | |
1605 | ||
1606 | if (!sync && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) | |
1607 | sync = 1; | |
1608 | ||
1609 | /* | |
1610 | * XXX: Is it ok to execute these checks a second time? | |
1611 | */ | |
1612 | ret = generic_write_checks(file, ppos, &count, S_ISBLK(inode->i_mode)); | |
1613 | if (ret) | |
1614 | goto out; | |
1615 | ||
1616 | /* | |
1617 | * Set pos so that sync_page_range_nolock() below understands | |
1618 | * where to start from. We might've moved it around via the | |
1619 | * calls above. The range we want to actually sync starts from | |
1620 | * *ppos here. | |
1621 | * | |
1622 | */ | |
1623 | pos = *ppos; | |
1624 | ||
ccd979bd | 1625 | /* communicate with ocfs2_dio_end_io */ |
7cdfc3a1 | 1626 | ocfs2_iocb_set_rw_locked(iocb, rw_level); |
ccd979bd | 1627 | |
9517bac6 MF |
1628 | if (direct_io) { |
1629 | written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos, | |
1630 | ppos, count, ocount); | |
1631 | if (written < 0) { | |
1632 | ret = written; | |
1633 | goto out_dio; | |
1634 | } | |
1635 | } else { | |
1636 | written = ocfs2_file_buffered_write(file, ppos, iov, nr_segs, | |
1637 | count, written); | |
1638 | if (written < 0) { | |
1639 | ret = written; | |
1640 | if (ret != -EFAULT || ret != -ENOSPC) | |
1641 | mlog_errno(ret); | |
1642 | goto out; | |
1643 | } | |
1644 | } | |
ccd979bd | 1645 | |
9517bac6 | 1646 | out_dio: |
ccd979bd | 1647 | /* buffered aio wouldn't have proper lock coverage today */ |
9517bac6 | 1648 | BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT)); |
ccd979bd MF |
1649 | |
1650 | /* | |
1651 | * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io | |
1652 | * function pointer which is called when o_direct io completes so that | |
1653 | * it can unlock our rw lock. (it's the clustered equivalent of | |
1654 | * i_alloc_sem; protects truncate from racing with pending ios). | |
1655 | * Unfortunately there are error cases which call end_io and others | |
1656 | * that don't. so we don't have to unlock the rw_lock if either an | |
1657 | * async dio is going to do it in the future or an end_io after an | |
1658 | * error has already done it. | |
1659 | */ | |
1660 | if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) { | |
1661 | rw_level = -1; | |
1662 | have_alloc_sem = 0; | |
1663 | } | |
1664 | ||
1665 | out: | |
9517bac6 MF |
1666 | if (rw_level != -1) |
1667 | ocfs2_rw_unlock(inode, rw_level); | |
1668 | ||
1669 | out_sems: | |
ccd979bd MF |
1670 | if (have_alloc_sem) |
1671 | up_read(&inode->i_alloc_sem); | |
9517bac6 MF |
1672 | |
1673 | if (written > 0 && sync) { | |
1674 | ssize_t err; | |
1675 | ||
1676 | err = sync_page_range_nolock(inode, file->f_mapping, pos, count); | |
1677 | if (err < 0) | |
1678 | written = err; | |
1679 | } | |
1680 | ||
1b1dcc1b | 1681 | mutex_unlock(&inode->i_mutex); |
ccd979bd MF |
1682 | |
1683 | mlog_exit(ret); | |
9517bac6 | 1684 | return written ? written : ret; |
ccd979bd MF |
1685 | } |
1686 | ||
6af67d82 MF |
1687 | static int ocfs2_splice_write_actor(struct pipe_inode_info *pipe, |
1688 | struct pipe_buffer *buf, | |
1689 | struct splice_desc *sd) | |
1690 | { | |
3a307ffc | 1691 | int ret, count; |
6af67d82 | 1692 | ssize_t copied = 0; |
3a307ffc MF |
1693 | struct file *file = sd->u.file; |
1694 | unsigned int offset; | |
1695 | struct page *page = NULL; | |
1696 | void *fsdata; | |
1697 | char *src, *dst; | |
6af67d82 | 1698 | |
cac36bb0 | 1699 | ret = buf->ops->confirm(pipe, buf); |
6af67d82 MF |
1700 | if (ret) |
1701 | goto out; | |
1702 | ||
3a307ffc | 1703 | offset = sd->pos & ~PAGE_CACHE_MASK; |
6af67d82 | 1704 | count = sd->len; |
3a307ffc MF |
1705 | if (count + offset > PAGE_CACHE_SIZE) |
1706 | count = PAGE_CACHE_SIZE - offset; | |
6af67d82 | 1707 | |
3a307ffc MF |
1708 | ret = ocfs2_write_begin(file, file->f_mapping, sd->pos, count, 0, |
1709 | &page, &fsdata); | |
1710 | if (ret) { | |
1711 | mlog_errno(ret); | |
1712 | goto out; | |
1713 | } | |
6af67d82 | 1714 | |
3a307ffc MF |
1715 | src = buf->ops->map(pipe, buf, 1); |
1716 | dst = kmap_atomic(page, KM_USER1); | |
1717 | memcpy(dst + offset, src + buf->offset, count); | |
1718 | kunmap_atomic(page, KM_USER1); | |
1719 | buf->ops->unmap(pipe, buf, src); | |
6af67d82 | 1720 | |
3a307ffc MF |
1721 | copied = ocfs2_write_end(file, file->f_mapping, sd->pos, count, count, |
1722 | page, fsdata); | |
1723 | if (copied < 0) { | |
1724 | mlog_errno(copied); | |
1725 | ret = copied; | |
1726 | goto out; | |
1727 | } | |
6af67d82 MF |
1728 | out: |
1729 | ||
3a307ffc | 1730 | return copied ? copied : ret; |
6af67d82 MF |
1731 | } |
1732 | ||
1733 | static ssize_t __ocfs2_file_splice_write(struct pipe_inode_info *pipe, | |
1734 | struct file *out, | |
1735 | loff_t *ppos, | |
1736 | size_t len, | |
1737 | unsigned int flags) | |
1738 | { | |
1739 | int ret, err; | |
1740 | struct address_space *mapping = out->f_mapping; | |
1741 | struct inode *inode = mapping->host; | |
c66ab6fa JA |
1742 | struct splice_desc sd = { |
1743 | .total_len = len, | |
1744 | .flags = flags, | |
1745 | .pos = *ppos, | |
6a14b90b | 1746 | .u.file = out, |
c66ab6fa JA |
1747 | }; |
1748 | ||
1749 | ret = __splice_from_pipe(pipe, &sd, ocfs2_splice_write_actor); | |
6af67d82 MF |
1750 | if (ret > 0) { |
1751 | *ppos += ret; | |
1752 | ||
1753 | if (unlikely((out->f_flags & O_SYNC) || IS_SYNC(inode))) { | |
1754 | err = generic_osync_inode(inode, mapping, | |
1755 | OSYNC_METADATA|OSYNC_DATA); | |
1756 | if (err) | |
1757 | ret = err; | |
1758 | } | |
1759 | } | |
1760 | ||
1761 | return ret; | |
1762 | } | |
1763 | ||
8659ac25 TY |
1764 | static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe, |
1765 | struct file *out, | |
1766 | loff_t *ppos, | |
1767 | size_t len, | |
1768 | unsigned int flags) | |
1769 | { | |
1770 | int ret; | |
d28c9174 | 1771 | struct inode *inode = out->f_path.dentry->d_inode; |
8659ac25 TY |
1772 | |
1773 | mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out, pipe, | |
1774 | (unsigned int)len, | |
d28c9174 JS |
1775 | out->f_path.dentry->d_name.len, |
1776 | out->f_path.dentry->d_name.name); | |
8659ac25 TY |
1777 | |
1778 | inode_double_lock(inode, pipe->inode); | |
1779 | ||
1780 | ret = ocfs2_rw_lock(inode, 1); | |
1781 | if (ret < 0) { | |
1782 | mlog_errno(ret); | |
1783 | goto out; | |
1784 | } | |
1785 | ||
9517bac6 MF |
1786 | ret = ocfs2_prepare_inode_for_write(out->f_path.dentry, ppos, len, 0, |
1787 | NULL); | |
8659ac25 TY |
1788 | if (ret < 0) { |
1789 | mlog_errno(ret); | |
1790 | goto out_unlock; | |
1791 | } | |
1792 | ||
1793 | /* ok, we're done with i_size and alloc work */ | |
6af67d82 | 1794 | ret = __ocfs2_file_splice_write(pipe, out, ppos, len, flags); |
8659ac25 TY |
1795 | |
1796 | out_unlock: | |
1797 | ocfs2_rw_unlock(inode, 1); | |
1798 | out: | |
1799 | inode_double_unlock(inode, pipe->inode); | |
1800 | ||
1801 | mlog_exit(ret); | |
1802 | return ret; | |
1803 | } | |
1804 | ||
1805 | static ssize_t ocfs2_file_splice_read(struct file *in, | |
1806 | loff_t *ppos, | |
1807 | struct pipe_inode_info *pipe, | |
1808 | size_t len, | |
1809 | unsigned int flags) | |
1810 | { | |
1811 | int ret = 0; | |
d28c9174 | 1812 | struct inode *inode = in->f_path.dentry->d_inode; |
8659ac25 TY |
1813 | |
1814 | mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe, | |
1815 | (unsigned int)len, | |
d28c9174 JS |
1816 | in->f_path.dentry->d_name.len, |
1817 | in->f_path.dentry->d_name.name); | |
8659ac25 TY |
1818 | |
1819 | /* | |
1820 | * See the comment in ocfs2_file_aio_read() | |
1821 | */ | |
1822 | ret = ocfs2_meta_lock(inode, NULL, 0); | |
1823 | if (ret < 0) { | |
1824 | mlog_errno(ret); | |
1825 | goto bail; | |
1826 | } | |
1827 | ocfs2_meta_unlock(inode, 0); | |
1828 | ||
1829 | ret = generic_file_splice_read(in, ppos, pipe, len, flags); | |
1830 | ||
1831 | bail: | |
1832 | mlog_exit(ret); | |
1833 | return ret; | |
1834 | } | |
1835 | ||
ccd979bd | 1836 | static ssize_t ocfs2_file_aio_read(struct kiocb *iocb, |
027445c3 BP |
1837 | const struct iovec *iov, |
1838 | unsigned long nr_segs, | |
ccd979bd MF |
1839 | loff_t pos) |
1840 | { | |
25899dee | 1841 | int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0; |
ccd979bd | 1842 | struct file *filp = iocb->ki_filp; |
d28c9174 | 1843 | struct inode *inode = filp->f_path.dentry->d_inode; |
ccd979bd | 1844 | |
027445c3 BP |
1845 | mlog_entry("(0x%p, %u, '%.*s')\n", filp, |
1846 | (unsigned int)nr_segs, | |
d28c9174 JS |
1847 | filp->f_path.dentry->d_name.len, |
1848 | filp->f_path.dentry->d_name.name); | |
ccd979bd MF |
1849 | |
1850 | if (!inode) { | |
1851 | ret = -EINVAL; | |
1852 | mlog_errno(ret); | |
1853 | goto bail; | |
1854 | } | |
1855 | ||
ccd979bd MF |
1856 | /* |
1857 | * buffered reads protect themselves in ->readpage(). O_DIRECT reads | |
1858 | * need locks to protect pending reads from racing with truncate. | |
1859 | */ | |
1860 | if (filp->f_flags & O_DIRECT) { | |
1861 | down_read(&inode->i_alloc_sem); | |
1862 | have_alloc_sem = 1; | |
1863 | ||
1864 | ret = ocfs2_rw_lock(inode, 0); | |
1865 | if (ret < 0) { | |
1866 | mlog_errno(ret); | |
1867 | goto bail; | |
1868 | } | |
1869 | rw_level = 0; | |
1870 | /* communicate with ocfs2_dio_end_io */ | |
7cdfc3a1 | 1871 | ocfs2_iocb_set_rw_locked(iocb, rw_level); |
ccd979bd MF |
1872 | } |
1873 | ||
c4374f8a MF |
1874 | /* |
1875 | * We're fine letting folks race truncates and extending | |
1876 | * writes with read across the cluster, just like they can | |
1877 | * locally. Hence no rw_lock during read. | |
1878 | * | |
1879 | * Take and drop the meta data lock to update inode fields | |
1880 | * like i_size. This allows the checks down below | |
1881 | * generic_file_aio_read() a chance of actually working. | |
1882 | */ | |
25899dee | 1883 | ret = ocfs2_meta_lock_atime(inode, filp->f_vfsmnt, &lock_level); |
c4374f8a MF |
1884 | if (ret < 0) { |
1885 | mlog_errno(ret); | |
1886 | goto bail; | |
1887 | } | |
25899dee | 1888 | ocfs2_meta_unlock(inode, lock_level); |
c4374f8a | 1889 | |
027445c3 | 1890 | ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos); |
ccd979bd MF |
1891 | if (ret == -EINVAL) |
1892 | mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n"); | |
1893 | ||
1894 | /* buffered aio wouldn't have proper lock coverage today */ | |
1895 | BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT)); | |
1896 | ||
1897 | /* see ocfs2_file_aio_write */ | |
1898 | if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) { | |
1899 | rw_level = -1; | |
1900 | have_alloc_sem = 0; | |
1901 | } | |
1902 | ||
1903 | bail: | |
1904 | if (have_alloc_sem) | |
1905 | up_read(&inode->i_alloc_sem); | |
1906 | if (rw_level != -1) | |
1907 | ocfs2_rw_unlock(inode, rw_level); | |
1908 | mlog_exit(ret); | |
1909 | ||
1910 | return ret; | |
1911 | } | |
1912 | ||
92e1d5be | 1913 | const struct inode_operations ocfs2_file_iops = { |
ccd979bd MF |
1914 | .setattr = ocfs2_setattr, |
1915 | .getattr = ocfs2_getattr, | |
d38eb8db | 1916 | .permission = ocfs2_permission, |
ccd979bd MF |
1917 | }; |
1918 | ||
92e1d5be | 1919 | const struct inode_operations ocfs2_special_file_iops = { |
ccd979bd MF |
1920 | .setattr = ocfs2_setattr, |
1921 | .getattr = ocfs2_getattr, | |
d38eb8db | 1922 | .permission = ocfs2_permission, |
ccd979bd MF |
1923 | }; |
1924 | ||
4b6f5d20 | 1925 | const struct file_operations ocfs2_fops = { |
ccd979bd MF |
1926 | .read = do_sync_read, |
1927 | .write = do_sync_write, | |
ccd979bd MF |
1928 | .mmap = ocfs2_mmap, |
1929 | .fsync = ocfs2_sync_file, | |
1930 | .release = ocfs2_file_release, | |
1931 | .open = ocfs2_file_open, | |
1932 | .aio_read = ocfs2_file_aio_read, | |
1933 | .aio_write = ocfs2_file_aio_write, | |
ca4d147e | 1934 | .ioctl = ocfs2_ioctl, |
586d232b MF |
1935 | #ifdef CONFIG_COMPAT |
1936 | .compat_ioctl = ocfs2_compat_ioctl, | |
1937 | #endif | |
8659ac25 TY |
1938 | .splice_read = ocfs2_file_splice_read, |
1939 | .splice_write = ocfs2_file_splice_write, | |
ccd979bd MF |
1940 | }; |
1941 | ||
4b6f5d20 | 1942 | const struct file_operations ocfs2_dops = { |
ccd979bd MF |
1943 | .read = generic_read_dir, |
1944 | .readdir = ocfs2_readdir, | |
1945 | .fsync = ocfs2_sync_file, | |
ca4d147e | 1946 | .ioctl = ocfs2_ioctl, |
586d232b MF |
1947 | #ifdef CONFIG_COMPAT |
1948 | .compat_ioctl = ocfs2_compat_ioctl, | |
1949 | #endif | |
ccd979bd | 1950 | }; |