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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 | ||
26 | #include <linux/capability.h> | |
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> | |
33 | #include <linux/sched.h> | |
34 | #include <linux/splice.h> | |
35 | #include <linux/mount.h> | |
36 | #include <linux/writeback.h> | |
37 | #include <linux/falloc.h> | |
38 | #include <linux/quotaops.h> | |
39 | #include <linux/blkdev.h> | |
40 | ||
41 | #define MLOG_MASK_PREFIX ML_INODE | |
42 | #include <cluster/masklog.h> | |
43 | ||
44 | #include "ocfs2.h" | |
45 | ||
46 | #include "alloc.h" | |
47 | #include "aops.h" | |
48 | #include "dir.h" | |
49 | #include "dlmglue.h" | |
50 | #include "extent_map.h" | |
51 | #include "file.h" | |
52 | #include "sysfile.h" | |
53 | #include "inode.h" | |
54 | #include "ioctl.h" | |
55 | #include "journal.h" | |
56 | #include "locks.h" | |
57 | #include "mmap.h" | |
58 | #include "suballoc.h" | |
59 | #include "super.h" | |
60 | #include "xattr.h" | |
61 | #include "acl.h" | |
62 | #include "quota.h" | |
63 | #include "refcounttree.h" | |
64 | ||
65 | #include "buffer_head_io.h" | |
66 | ||
67 | static int ocfs2_init_file_private(struct inode *inode, struct file *file) | |
68 | { | |
69 | struct ocfs2_file_private *fp; | |
70 | ||
71 | fp = kzalloc(sizeof(struct ocfs2_file_private), GFP_KERNEL); | |
72 | if (!fp) | |
73 | return -ENOMEM; | |
74 | ||
75 | fp->fp_file = file; | |
76 | mutex_init(&fp->fp_mutex); | |
77 | ocfs2_file_lock_res_init(&fp->fp_flock, fp); | |
78 | file->private_data = fp; | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
83 | static void ocfs2_free_file_private(struct inode *inode, struct file *file) | |
84 | { | |
85 | struct ocfs2_file_private *fp = file->private_data; | |
86 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
87 | ||
88 | if (fp) { | |
89 | ocfs2_simple_drop_lockres(osb, &fp->fp_flock); | |
90 | ocfs2_lock_res_free(&fp->fp_flock); | |
91 | kfree(fp); | |
92 | file->private_data = NULL; | |
93 | } | |
94 | } | |
95 | ||
96 | static int ocfs2_file_open(struct inode *inode, struct file *file) | |
97 | { | |
98 | int status; | |
99 | int mode = file->f_flags; | |
100 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
101 | ||
102 | mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file, | |
103 | file->f_path.dentry->d_name.len, file->f_path.dentry->d_name.name); | |
104 | ||
105 | if (file->f_mode & FMODE_WRITE) | |
106 | dquot_initialize(inode); | |
107 | ||
108 | spin_lock(&oi->ip_lock); | |
109 | ||
110 | /* Check that the inode hasn't been wiped from disk by another | |
111 | * node. If it hasn't then we're safe as long as we hold the | |
112 | * spin lock until our increment of open count. */ | |
113 | if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) { | |
114 | spin_unlock(&oi->ip_lock); | |
115 | ||
116 | status = -ENOENT; | |
117 | goto leave; | |
118 | } | |
119 | ||
120 | if (mode & O_DIRECT) | |
121 | oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT; | |
122 | ||
123 | oi->ip_open_count++; | |
124 | spin_unlock(&oi->ip_lock); | |
125 | ||
126 | status = ocfs2_init_file_private(inode, file); | |
127 | if (status) { | |
128 | /* | |
129 | * We want to set open count back if we're failing the | |
130 | * open. | |
131 | */ | |
132 | spin_lock(&oi->ip_lock); | |
133 | oi->ip_open_count--; | |
134 | spin_unlock(&oi->ip_lock); | |
135 | } | |
136 | ||
137 | leave: | |
138 | mlog_exit(status); | |
139 | return status; | |
140 | } | |
141 | ||
142 | static int ocfs2_file_release(struct inode *inode, struct file *file) | |
143 | { | |
144 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
145 | ||
146 | mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file, | |
147 | file->f_path.dentry->d_name.len, | |
148 | file->f_path.dentry->d_name.name); | |
149 | ||
150 | spin_lock(&oi->ip_lock); | |
151 | if (!--oi->ip_open_count) | |
152 | oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT; | |
153 | spin_unlock(&oi->ip_lock); | |
154 | ||
155 | ocfs2_free_file_private(inode, file); | |
156 | ||
157 | mlog_exit(0); | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | static int ocfs2_dir_open(struct inode *inode, struct file *file) | |
163 | { | |
164 | return ocfs2_init_file_private(inode, file); | |
165 | } | |
166 | ||
167 | static int ocfs2_dir_release(struct inode *inode, struct file *file) | |
168 | { | |
169 | ocfs2_free_file_private(inode, file); | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static int ocfs2_sync_file(struct file *file, int datasync) | |
174 | { | |
175 | int err = 0; | |
176 | journal_t *journal; | |
177 | struct inode *inode = file->f_mapping->host; | |
178 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
179 | ||
180 | mlog_entry("(0x%p, %d, 0x%p, '%.*s')\n", file, datasync, | |
181 | file->f_path.dentry, file->f_path.dentry->d_name.len, | |
182 | file->f_path.dentry->d_name.name); | |
183 | ||
184 | if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) { | |
185 | /* | |
186 | * We still have to flush drive's caches to get data to the | |
187 | * platter | |
188 | */ | |
189 | if (osb->s_mount_opt & OCFS2_MOUNT_BARRIER) | |
190 | blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, | |
191 | NULL, BLKDEV_IFL_WAIT); | |
192 | goto bail; | |
193 | } | |
194 | ||
195 | journal = osb->journal->j_journal; | |
196 | err = jbd2_journal_force_commit(journal); | |
197 | ||
198 | bail: | |
199 | mlog_exit(err); | |
200 | ||
201 | return (err < 0) ? -EIO : 0; | |
202 | } | |
203 | ||
204 | int ocfs2_should_update_atime(struct inode *inode, | |
205 | struct vfsmount *vfsmnt) | |
206 | { | |
207 | struct timespec now; | |
208 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
209 | ||
210 | if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) | |
211 | return 0; | |
212 | ||
213 | if ((inode->i_flags & S_NOATIME) || | |
214 | ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode))) | |
215 | return 0; | |
216 | ||
217 | /* | |
218 | * We can be called with no vfsmnt structure - NFSD will | |
219 | * sometimes do this. | |
220 | * | |
221 | * Note that our action here is different than touch_atime() - | |
222 | * if we can't tell whether this is a noatime mount, then we | |
223 | * don't know whether to trust the value of s_atime_quantum. | |
224 | */ | |
225 | if (vfsmnt == NULL) | |
226 | return 0; | |
227 | ||
228 | if ((vfsmnt->mnt_flags & MNT_NOATIME) || | |
229 | ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) | |
230 | return 0; | |
231 | ||
232 | if (vfsmnt->mnt_flags & MNT_RELATIME) { | |
233 | if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) || | |
234 | (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0)) | |
235 | return 1; | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | now = CURRENT_TIME; | |
241 | if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum)) | |
242 | return 0; | |
243 | else | |
244 | return 1; | |
245 | } | |
246 | ||
247 | int ocfs2_update_inode_atime(struct inode *inode, | |
248 | struct buffer_head *bh) | |
249 | { | |
250 | int ret; | |
251 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
252 | handle_t *handle; | |
253 | struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data; | |
254 | ||
255 | mlog_entry_void(); | |
256 | ||
257 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); | |
258 | if (IS_ERR(handle)) { | |
259 | ret = PTR_ERR(handle); | |
260 | mlog_errno(ret); | |
261 | goto out; | |
262 | } | |
263 | ||
264 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh, | |
265 | OCFS2_JOURNAL_ACCESS_WRITE); | |
266 | if (ret) { | |
267 | mlog_errno(ret); | |
268 | goto out_commit; | |
269 | } | |
270 | ||
271 | /* | |
272 | * Don't use ocfs2_mark_inode_dirty() here as we don't always | |
273 | * have i_mutex to guard against concurrent changes to other | |
274 | * inode fields. | |
275 | */ | |
276 | inode->i_atime = CURRENT_TIME; | |
277 | di->i_atime = cpu_to_le64(inode->i_atime.tv_sec); | |
278 | di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec); | |
279 | ocfs2_journal_dirty(handle, bh); | |
280 | ||
281 | out_commit: | |
282 | ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); | |
283 | out: | |
284 | mlog_exit(ret); | |
285 | return ret; | |
286 | } | |
287 | ||
288 | static int ocfs2_set_inode_size(handle_t *handle, | |
289 | struct inode *inode, | |
290 | struct buffer_head *fe_bh, | |
291 | u64 new_i_size) | |
292 | { | |
293 | int status; | |
294 | ||
295 | mlog_entry_void(); | |
296 | i_size_write(inode, new_i_size); | |
297 | inode->i_blocks = ocfs2_inode_sector_count(inode); | |
298 | inode->i_ctime = inode->i_mtime = CURRENT_TIME; | |
299 | ||
300 | status = ocfs2_mark_inode_dirty(handle, inode, fe_bh); | |
301 | if (status < 0) { | |
302 | mlog_errno(status); | |
303 | goto bail; | |
304 | } | |
305 | ||
306 | bail: | |
307 | mlog_exit(status); | |
308 | return status; | |
309 | } | |
310 | ||
311 | int ocfs2_simple_size_update(struct inode *inode, | |
312 | struct buffer_head *di_bh, | |
313 | u64 new_i_size) | |
314 | { | |
315 | int ret; | |
316 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
317 | handle_t *handle = NULL; | |
318 | ||
319 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); | |
320 | if (IS_ERR(handle)) { | |
321 | ret = PTR_ERR(handle); | |
322 | mlog_errno(ret); | |
323 | goto out; | |
324 | } | |
325 | ||
326 | ret = ocfs2_set_inode_size(handle, inode, di_bh, | |
327 | new_i_size); | |
328 | if (ret < 0) | |
329 | mlog_errno(ret); | |
330 | ||
331 | ocfs2_commit_trans(osb, handle); | |
332 | out: | |
333 | return ret; | |
334 | } | |
335 | ||
336 | static int ocfs2_cow_file_pos(struct inode *inode, | |
337 | struct buffer_head *fe_bh, | |
338 | u64 offset) | |
339 | { | |
340 | int status; | |
341 | u32 phys, cpos = offset >> OCFS2_SB(inode->i_sb)->s_clustersize_bits; | |
342 | unsigned int num_clusters = 0; | |
343 | unsigned int ext_flags = 0; | |
344 | ||
345 | /* | |
346 | * If the new offset is aligned to the range of the cluster, there is | |
347 | * no space for ocfs2_zero_range_for_truncate to fill, so no need to | |
348 | * CoW either. | |
349 | */ | |
350 | if ((offset & (OCFS2_SB(inode->i_sb)->s_clustersize - 1)) == 0) | |
351 | return 0; | |
352 | ||
353 | status = ocfs2_get_clusters(inode, cpos, &phys, | |
354 | &num_clusters, &ext_flags); | |
355 | if (status) { | |
356 | mlog_errno(status); | |
357 | goto out; | |
358 | } | |
359 | ||
360 | if (!(ext_flags & OCFS2_EXT_REFCOUNTED)) | |
361 | goto out; | |
362 | ||
363 | return ocfs2_refcount_cow(inode, NULL, fe_bh, cpos, 1, cpos+1); | |
364 | ||
365 | out: | |
366 | return status; | |
367 | } | |
368 | ||
369 | static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb, | |
370 | struct inode *inode, | |
371 | struct buffer_head *fe_bh, | |
372 | u64 new_i_size) | |
373 | { | |
374 | int status; | |
375 | handle_t *handle; | |
376 | struct ocfs2_dinode *di; | |
377 | u64 cluster_bytes; | |
378 | ||
379 | mlog_entry_void(); | |
380 | ||
381 | /* | |
382 | * We need to CoW the cluster contains the offset if it is reflinked | |
383 | * since we will call ocfs2_zero_range_for_truncate later which will | |
384 | * write "0" from offset to the end of the cluster. | |
385 | */ | |
386 | status = ocfs2_cow_file_pos(inode, fe_bh, new_i_size); | |
387 | if (status) { | |
388 | mlog_errno(status); | |
389 | return status; | |
390 | } | |
391 | ||
392 | /* TODO: This needs to actually orphan the inode in this | |
393 | * transaction. */ | |
394 | ||
395 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); | |
396 | if (IS_ERR(handle)) { | |
397 | status = PTR_ERR(handle); | |
398 | mlog_errno(status); | |
399 | goto out; | |
400 | } | |
401 | ||
402 | status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh, | |
403 | OCFS2_JOURNAL_ACCESS_WRITE); | |
404 | if (status < 0) { | |
405 | mlog_errno(status); | |
406 | goto out_commit; | |
407 | } | |
408 | ||
409 | /* | |
410 | * Do this before setting i_size. | |
411 | */ | |
412 | cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size); | |
413 | status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size, | |
414 | cluster_bytes); | |
415 | if (status) { | |
416 | mlog_errno(status); | |
417 | goto out_commit; | |
418 | } | |
419 | ||
420 | i_size_write(inode, new_i_size); | |
421 | inode->i_ctime = inode->i_mtime = CURRENT_TIME; | |
422 | ||
423 | di = (struct ocfs2_dinode *) fe_bh->b_data; | |
424 | di->i_size = cpu_to_le64(new_i_size); | |
425 | di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec); | |
426 | di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); | |
427 | ||
428 | ocfs2_journal_dirty(handle, fe_bh); | |
429 | ||
430 | out_commit: | |
431 | ocfs2_commit_trans(osb, handle); | |
432 | out: | |
433 | ||
434 | mlog_exit(status); | |
435 | return status; | |
436 | } | |
437 | ||
438 | static int ocfs2_truncate_file(struct inode *inode, | |
439 | struct buffer_head *di_bh, | |
440 | u64 new_i_size) | |
441 | { | |
442 | int status = 0; | |
443 | struct ocfs2_dinode *fe = NULL; | |
444 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
445 | ||
446 | mlog_entry("(inode = %llu, new_i_size = %llu\n", | |
447 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
448 | (unsigned long long)new_i_size); | |
449 | ||
450 | /* We trust di_bh because it comes from ocfs2_inode_lock(), which | |
451 | * already validated it */ | |
452 | fe = (struct ocfs2_dinode *) di_bh->b_data; | |
453 | ||
454 | mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode), | |
455 | "Inode %llu, inode i_size = %lld != di " | |
456 | "i_size = %llu, i_flags = 0x%x\n", | |
457 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
458 | i_size_read(inode), | |
459 | (unsigned long long)le64_to_cpu(fe->i_size), | |
460 | le32_to_cpu(fe->i_flags)); | |
461 | ||
462 | if (new_i_size > le64_to_cpu(fe->i_size)) { | |
463 | mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n", | |
464 | (unsigned long long)le64_to_cpu(fe->i_size), | |
465 | (unsigned long long)new_i_size); | |
466 | status = -EINVAL; | |
467 | mlog_errno(status); | |
468 | goto bail; | |
469 | } | |
470 | ||
471 | mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n", | |
472 | (unsigned long long)le64_to_cpu(fe->i_blkno), | |
473 | (unsigned long long)le64_to_cpu(fe->i_size), | |
474 | (unsigned long long)new_i_size); | |
475 | ||
476 | /* lets handle the simple truncate cases before doing any more | |
477 | * cluster locking. */ | |
478 | if (new_i_size == le64_to_cpu(fe->i_size)) | |
479 | goto bail; | |
480 | ||
481 | down_write(&OCFS2_I(inode)->ip_alloc_sem); | |
482 | ||
483 | ocfs2_resv_discard(&osb->osb_la_resmap, | |
484 | &OCFS2_I(inode)->ip_la_data_resv); | |
485 | ||
486 | /* | |
487 | * The inode lock forced other nodes to sync and drop their | |
488 | * pages, which (correctly) happens even if we have a truncate | |
489 | * without allocation change - ocfs2 cluster sizes can be much | |
490 | * greater than page size, so we have to truncate them | |
491 | * anyway. | |
492 | */ | |
493 | unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1); | |
494 | truncate_inode_pages(inode->i_mapping, new_i_size); | |
495 | ||
496 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { | |
497 | status = ocfs2_truncate_inline(inode, di_bh, new_i_size, | |
498 | i_size_read(inode), 1); | |
499 | if (status) | |
500 | mlog_errno(status); | |
501 | ||
502 | goto bail_unlock_sem; | |
503 | } | |
504 | ||
505 | /* alright, we're going to need to do a full blown alloc size | |
506 | * change. Orphan the inode so that recovery can complete the | |
507 | * truncate if necessary. This does the task of marking | |
508 | * i_size. */ | |
509 | status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size); | |
510 | if (status < 0) { | |
511 | mlog_errno(status); | |
512 | goto bail_unlock_sem; | |
513 | } | |
514 | ||
515 | status = ocfs2_commit_truncate(osb, inode, di_bh); | |
516 | if (status < 0) { | |
517 | mlog_errno(status); | |
518 | goto bail_unlock_sem; | |
519 | } | |
520 | ||
521 | /* TODO: orphan dir cleanup here. */ | |
522 | bail_unlock_sem: | |
523 | up_write(&OCFS2_I(inode)->ip_alloc_sem); | |
524 | ||
525 | bail: | |
526 | if (!status && OCFS2_I(inode)->ip_clusters == 0) | |
527 | status = ocfs2_try_remove_refcount_tree(inode, di_bh); | |
528 | ||
529 | mlog_exit(status); | |
530 | return status; | |
531 | } | |
532 | ||
533 | /* | |
534 | * extend file allocation only here. | |
535 | * we'll update all the disk stuff, and oip->alloc_size | |
536 | * | |
537 | * expect stuff to be locked, a transaction started and enough data / | |
538 | * metadata reservations in the contexts. | |
539 | * | |
540 | * Will return -EAGAIN, and a reason if a restart is needed. | |
541 | * If passed in, *reason will always be set, even in error. | |
542 | */ | |
543 | int ocfs2_add_inode_data(struct ocfs2_super *osb, | |
544 | struct inode *inode, | |
545 | u32 *logical_offset, | |
546 | u32 clusters_to_add, | |
547 | int mark_unwritten, | |
548 | struct buffer_head *fe_bh, | |
549 | handle_t *handle, | |
550 | struct ocfs2_alloc_context *data_ac, | |
551 | struct ocfs2_alloc_context *meta_ac, | |
552 | enum ocfs2_alloc_restarted *reason_ret) | |
553 | { | |
554 | int ret; | |
555 | struct ocfs2_extent_tree et; | |
556 | ||
557 | ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), fe_bh); | |
558 | ret = ocfs2_add_clusters_in_btree(handle, &et, logical_offset, | |
559 | clusters_to_add, mark_unwritten, | |
560 | data_ac, meta_ac, reason_ret); | |
561 | ||
562 | return ret; | |
563 | } | |
564 | ||
565 | static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start, | |
566 | u32 clusters_to_add, int mark_unwritten) | |
567 | { | |
568 | int status = 0; | |
569 | int restart_func = 0; | |
570 | int credits; | |
571 | u32 prev_clusters; | |
572 | struct buffer_head *bh = NULL; | |
573 | struct ocfs2_dinode *fe = NULL; | |
574 | handle_t *handle = NULL; | |
575 | struct ocfs2_alloc_context *data_ac = NULL; | |
576 | struct ocfs2_alloc_context *meta_ac = NULL; | |
577 | enum ocfs2_alloc_restarted why; | |
578 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
579 | struct ocfs2_extent_tree et; | |
580 | int did_quota = 0; | |
581 | ||
582 | mlog_entry("(clusters_to_add = %u)\n", clusters_to_add); | |
583 | ||
584 | /* | |
585 | * This function only exists for file systems which don't | |
586 | * support holes. | |
587 | */ | |
588 | BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb)); | |
589 | ||
590 | status = ocfs2_read_inode_block(inode, &bh); | |
591 | if (status < 0) { | |
592 | mlog_errno(status); | |
593 | goto leave; | |
594 | } | |
595 | fe = (struct ocfs2_dinode *) bh->b_data; | |
596 | ||
597 | restart_all: | |
598 | BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters); | |
599 | ||
600 | mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, " | |
601 | "clusters_to_add = %u\n", | |
602 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
603 | (long long)i_size_read(inode), le32_to_cpu(fe->i_clusters), | |
604 | clusters_to_add); | |
605 | ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), bh); | |
606 | status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0, | |
607 | &data_ac, &meta_ac); | |
608 | if (status) { | |
609 | mlog_errno(status); | |
610 | goto leave; | |
611 | } | |
612 | ||
613 | credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list, | |
614 | clusters_to_add); | |
615 | handle = ocfs2_start_trans(osb, credits); | |
616 | if (IS_ERR(handle)) { | |
617 | status = PTR_ERR(handle); | |
618 | handle = NULL; | |
619 | mlog_errno(status); | |
620 | goto leave; | |
621 | } | |
622 | ||
623 | restarted_transaction: | |
624 | status = dquot_alloc_space_nodirty(inode, | |
625 | ocfs2_clusters_to_bytes(osb->sb, clusters_to_add)); | |
626 | if (status) | |
627 | goto leave; | |
628 | did_quota = 1; | |
629 | ||
630 | /* reserve a write to the file entry early on - that we if we | |
631 | * run out of credits in the allocation path, we can still | |
632 | * update i_size. */ | |
633 | status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh, | |
634 | OCFS2_JOURNAL_ACCESS_WRITE); | |
635 | if (status < 0) { | |
636 | mlog_errno(status); | |
637 | goto leave; | |
638 | } | |
639 | ||
640 | prev_clusters = OCFS2_I(inode)->ip_clusters; | |
641 | ||
642 | status = ocfs2_add_inode_data(osb, | |
643 | inode, | |
644 | &logical_start, | |
645 | clusters_to_add, | |
646 | mark_unwritten, | |
647 | bh, | |
648 | handle, | |
649 | data_ac, | |
650 | meta_ac, | |
651 | &why); | |
652 | if ((status < 0) && (status != -EAGAIN)) { | |
653 | if (status != -ENOSPC) | |
654 | mlog_errno(status); | |
655 | goto leave; | |
656 | } | |
657 | ||
658 | ocfs2_journal_dirty(handle, bh); | |
659 | ||
660 | spin_lock(&OCFS2_I(inode)->ip_lock); | |
661 | clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters); | |
662 | spin_unlock(&OCFS2_I(inode)->ip_lock); | |
663 | /* Release unused quota reservation */ | |
664 | dquot_free_space(inode, | |
665 | ocfs2_clusters_to_bytes(osb->sb, clusters_to_add)); | |
666 | did_quota = 0; | |
667 | ||
668 | if (why != RESTART_NONE && clusters_to_add) { | |
669 | if (why == RESTART_META) { | |
670 | mlog(0, "restarting function.\n"); | |
671 | restart_func = 1; | |
672 | status = 0; | |
673 | } else { | |
674 | BUG_ON(why != RESTART_TRANS); | |
675 | ||
676 | mlog(0, "restarting transaction.\n"); | |
677 | /* TODO: This can be more intelligent. */ | |
678 | credits = ocfs2_calc_extend_credits(osb->sb, | |
679 | &fe->id2.i_list, | |
680 | clusters_to_add); | |
681 | status = ocfs2_extend_trans(handle, credits); | |
682 | if (status < 0) { | |
683 | /* handle still has to be committed at | |
684 | * this point. */ | |
685 | status = -ENOMEM; | |
686 | mlog_errno(status); | |
687 | goto leave; | |
688 | } | |
689 | goto restarted_transaction; | |
690 | } | |
691 | } | |
692 | ||
693 | mlog(0, "fe: i_clusters = %u, i_size=%llu\n", | |
694 | le32_to_cpu(fe->i_clusters), | |
695 | (unsigned long long)le64_to_cpu(fe->i_size)); | |
696 | mlog(0, "inode: ip_clusters=%u, i_size=%lld\n", | |
697 | OCFS2_I(inode)->ip_clusters, (long long)i_size_read(inode)); | |
698 | ||
699 | leave: | |
700 | if (status < 0 && did_quota) | |
701 | dquot_free_space(inode, | |
702 | ocfs2_clusters_to_bytes(osb->sb, clusters_to_add)); | |
703 | if (handle) { | |
704 | ocfs2_commit_trans(osb, handle); | |
705 | handle = NULL; | |
706 | } | |
707 | if (data_ac) { | |
708 | ocfs2_free_alloc_context(data_ac); | |
709 | data_ac = NULL; | |
710 | } | |
711 | if (meta_ac) { | |
712 | ocfs2_free_alloc_context(meta_ac); | |
713 | meta_ac = NULL; | |
714 | } | |
715 | if ((!status) && restart_func) { | |
716 | restart_func = 0; | |
717 | goto restart_all; | |
718 | } | |
719 | brelse(bh); | |
720 | bh = NULL; | |
721 | ||
722 | mlog_exit(status); | |
723 | return status; | |
724 | } | |
725 | ||
726 | /* | |
727 | * While a write will already be ordering the data, a truncate will not. | |
728 | * Thus, we need to explicitly order the zeroed pages. | |
729 | */ | |
730 | static handle_t *ocfs2_zero_start_ordered_transaction(struct inode *inode) | |
731 | { | |
732 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
733 | handle_t *handle = NULL; | |
734 | int ret = 0; | |
735 | ||
736 | if (!ocfs2_should_order_data(inode)) | |
737 | goto out; | |
738 | ||
739 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); | |
740 | if (IS_ERR(handle)) { | |
741 | ret = -ENOMEM; | |
742 | mlog_errno(ret); | |
743 | goto out; | |
744 | } | |
745 | ||
746 | ret = ocfs2_jbd2_file_inode(handle, inode); | |
747 | if (ret < 0) | |
748 | mlog_errno(ret); | |
749 | ||
750 | out: | |
751 | if (ret) { | |
752 | if (!IS_ERR(handle)) | |
753 | ocfs2_commit_trans(osb, handle); | |
754 | handle = ERR_PTR(ret); | |
755 | } | |
756 | return handle; | |
757 | } | |
758 | ||
759 | /* Some parts of this taken from generic_cont_expand, which turned out | |
760 | * to be too fragile to do exactly what we need without us having to | |
761 | * worry about recursive locking in ->write_begin() and ->write_end(). */ | |
762 | static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from, | |
763 | u64 abs_to) | |
764 | { | |
765 | struct address_space *mapping = inode->i_mapping; | |
766 | struct page *page; | |
767 | unsigned long index = abs_from >> PAGE_CACHE_SHIFT; | |
768 | handle_t *handle = NULL; | |
769 | int ret = 0; | |
770 | unsigned zero_from, zero_to, block_start, block_end; | |
771 | ||
772 | BUG_ON(abs_from >= abs_to); | |
773 | BUG_ON(abs_to > (((u64)index + 1) << PAGE_CACHE_SHIFT)); | |
774 | BUG_ON(abs_from & (inode->i_blkbits - 1)); | |
775 | ||
776 | page = find_or_create_page(mapping, index, GFP_NOFS); | |
777 | if (!page) { | |
778 | ret = -ENOMEM; | |
779 | mlog_errno(ret); | |
780 | goto out; | |
781 | } | |
782 | ||
783 | /* Get the offsets within the page that we want to zero */ | |
784 | zero_from = abs_from & (PAGE_CACHE_SIZE - 1); | |
785 | zero_to = abs_to & (PAGE_CACHE_SIZE - 1); | |
786 | if (!zero_to) | |
787 | zero_to = PAGE_CACHE_SIZE; | |
788 | ||
789 | mlog(0, | |
790 | "abs_from = %llu, abs_to = %llu, index = %lu, zero_from = %u, zero_to = %u\n", | |
791 | (unsigned long long)abs_from, (unsigned long long)abs_to, | |
792 | index, zero_from, zero_to); | |
793 | ||
794 | /* We know that zero_from is block aligned */ | |
795 | for (block_start = zero_from; block_start < zero_to; | |
796 | block_start = block_end) { | |
797 | block_end = block_start + (1 << inode->i_blkbits); | |
798 | ||
799 | /* | |
800 | * block_start is block-aligned. Bump it by one to | |
801 | * force ocfs2_{prepare,commit}_write() to zero the | |
802 | * whole block. | |
803 | */ | |
804 | ret = ocfs2_prepare_write_nolock(inode, page, | |
805 | block_start + 1, | |
806 | block_start + 1); | |
807 | if (ret < 0) { | |
808 | mlog_errno(ret); | |
809 | goto out_unlock; | |
810 | } | |
811 | ||
812 | if (!handle) { | |
813 | handle = ocfs2_zero_start_ordered_transaction(inode); | |
814 | if (IS_ERR(handle)) { | |
815 | ret = PTR_ERR(handle); | |
816 | handle = NULL; | |
817 | break; | |
818 | } | |
819 | } | |
820 | ||
821 | /* must not update i_size! */ | |
822 | ret = block_commit_write(page, block_start + 1, | |
823 | block_start + 1); | |
824 | if (ret < 0) | |
825 | mlog_errno(ret); | |
826 | else | |
827 | ret = 0; | |
828 | } | |
829 | ||
830 | if (handle) | |
831 | ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); | |
832 | ||
833 | out_unlock: | |
834 | unlock_page(page); | |
835 | page_cache_release(page); | |
836 | out: | |
837 | return ret; | |
838 | } | |
839 | ||
840 | /* | |
841 | * Find the next range to zero. We do this in terms of bytes because | |
842 | * that's what ocfs2_zero_extend() wants, and it is dealing with the | |
843 | * pagecache. We may return multiple extents. | |
844 | * | |
845 | * zero_start and zero_end are ocfs2_zero_extend()s current idea of what | |
846 | * needs to be zeroed. range_start and range_end return the next zeroing | |
847 | * range. A subsequent call should pass the previous range_end as its | |
848 | * zero_start. If range_end is 0, there's nothing to do. | |
849 | * | |
850 | * Unwritten extents are skipped over. Refcounted extents are CoWd. | |
851 | */ | |
852 | static int ocfs2_zero_extend_get_range(struct inode *inode, | |
853 | struct buffer_head *di_bh, | |
854 | u64 zero_start, u64 zero_end, | |
855 | u64 *range_start, u64 *range_end) | |
856 | { | |
857 | int rc = 0, needs_cow = 0; | |
858 | u32 p_cpos, zero_clusters = 0; | |
859 | u32 zero_cpos = | |
860 | zero_start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits; | |
861 | u32 last_cpos = ocfs2_clusters_for_bytes(inode->i_sb, zero_end); | |
862 | unsigned int num_clusters = 0; | |
863 | unsigned int ext_flags = 0; | |
864 | ||
865 | while (zero_cpos < last_cpos) { | |
866 | rc = ocfs2_get_clusters(inode, zero_cpos, &p_cpos, | |
867 | &num_clusters, &ext_flags); | |
868 | if (rc) { | |
869 | mlog_errno(rc); | |
870 | goto out; | |
871 | } | |
872 | ||
873 | if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) { | |
874 | zero_clusters = num_clusters; | |
875 | if (ext_flags & OCFS2_EXT_REFCOUNTED) | |
876 | needs_cow = 1; | |
877 | break; | |
878 | } | |
879 | ||
880 | zero_cpos += num_clusters; | |
881 | } | |
882 | if (!zero_clusters) { | |
883 | *range_end = 0; | |
884 | goto out; | |
885 | } | |
886 | ||
887 | while ((zero_cpos + zero_clusters) < last_cpos) { | |
888 | rc = ocfs2_get_clusters(inode, zero_cpos + zero_clusters, | |
889 | &p_cpos, &num_clusters, | |
890 | &ext_flags); | |
891 | if (rc) { | |
892 | mlog_errno(rc); | |
893 | goto out; | |
894 | } | |
895 | ||
896 | if (!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN)) | |
897 | break; | |
898 | if (ext_flags & OCFS2_EXT_REFCOUNTED) | |
899 | needs_cow = 1; | |
900 | zero_clusters += num_clusters; | |
901 | } | |
902 | if ((zero_cpos + zero_clusters) > last_cpos) | |
903 | zero_clusters = last_cpos - zero_cpos; | |
904 | ||
905 | if (needs_cow) { | |
906 | rc = ocfs2_refcount_cow(inode, NULL, di_bh, zero_cpos, | |
907 | zero_clusters, UINT_MAX); | |
908 | if (rc) { | |
909 | mlog_errno(rc); | |
910 | goto out; | |
911 | } | |
912 | } | |
913 | ||
914 | *range_start = ocfs2_clusters_to_bytes(inode->i_sb, zero_cpos); | |
915 | *range_end = ocfs2_clusters_to_bytes(inode->i_sb, | |
916 | zero_cpos + zero_clusters); | |
917 | ||
918 | out: | |
919 | return rc; | |
920 | } | |
921 | ||
922 | /* | |
923 | * Zero one range returned from ocfs2_zero_extend_get_range(). The caller | |
924 | * has made sure that the entire range needs zeroing. | |
925 | */ | |
926 | static int ocfs2_zero_extend_range(struct inode *inode, u64 range_start, | |
927 | u64 range_end) | |
928 | { | |
929 | int rc = 0; | |
930 | u64 next_pos; | |
931 | u64 zero_pos = range_start; | |
932 | ||
933 | mlog(0, "range_start = %llu, range_end = %llu\n", | |
934 | (unsigned long long)range_start, | |
935 | (unsigned long long)range_end); | |
936 | BUG_ON(range_start >= range_end); | |
937 | ||
938 | while (zero_pos < range_end) { | |
939 | next_pos = (zero_pos & PAGE_CACHE_MASK) + PAGE_CACHE_SIZE; | |
940 | if (next_pos > range_end) | |
941 | next_pos = range_end; | |
942 | rc = ocfs2_write_zero_page(inode, zero_pos, next_pos); | |
943 | if (rc < 0) { | |
944 | mlog_errno(rc); | |
945 | break; | |
946 | } | |
947 | zero_pos = next_pos; | |
948 | ||
949 | /* | |
950 | * Very large extends have the potential to lock up | |
951 | * the cpu for extended periods of time. | |
952 | */ | |
953 | cond_resched(); | |
954 | } | |
955 | ||
956 | return rc; | |
957 | } | |
958 | ||
959 | int ocfs2_zero_extend(struct inode *inode, struct buffer_head *di_bh, | |
960 | loff_t zero_to_size) | |
961 | { | |
962 | int ret = 0; | |
963 | u64 zero_start, range_start = 0, range_end = 0; | |
964 | struct super_block *sb = inode->i_sb; | |
965 | ||
966 | zero_start = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode)); | |
967 | mlog(0, "zero_start %llu for i_size %llu\n", | |
968 | (unsigned long long)zero_start, | |
969 | (unsigned long long)i_size_read(inode)); | |
970 | while (zero_start < zero_to_size) { | |
971 | ret = ocfs2_zero_extend_get_range(inode, di_bh, zero_start, | |
972 | zero_to_size, | |
973 | &range_start, | |
974 | &range_end); | |
975 | if (ret) { | |
976 | mlog_errno(ret); | |
977 | break; | |
978 | } | |
979 | if (!range_end) | |
980 | break; | |
981 | /* Trim the ends */ | |
982 | if (range_start < zero_start) | |
983 | range_start = zero_start; | |
984 | if (range_end > zero_to_size) | |
985 | range_end = zero_to_size; | |
986 | ||
987 | ret = ocfs2_zero_extend_range(inode, range_start, | |
988 | range_end); | |
989 | if (ret) { | |
990 | mlog_errno(ret); | |
991 | break; | |
992 | } | |
993 | zero_start = range_end; | |
994 | } | |
995 | ||
996 | return ret; | |
997 | } | |
998 | ||
999 | int ocfs2_extend_no_holes(struct inode *inode, struct buffer_head *di_bh, | |
1000 | u64 new_i_size, u64 zero_to) | |
1001 | { | |
1002 | int ret; | |
1003 | u32 clusters_to_add; | |
1004 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
1005 | ||
1006 | /* | |
1007 | * Only quota files call this without a bh, and they can't be | |
1008 | * refcounted. | |
1009 | */ | |
1010 | BUG_ON(!di_bh && (oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)); | |
1011 | BUG_ON(!di_bh && !(oi->ip_flags & OCFS2_INODE_SYSTEM_FILE)); | |
1012 | ||
1013 | clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size); | |
1014 | if (clusters_to_add < oi->ip_clusters) | |
1015 | clusters_to_add = 0; | |
1016 | else | |
1017 | clusters_to_add -= oi->ip_clusters; | |
1018 | ||
1019 | if (clusters_to_add) { | |
1020 | ret = __ocfs2_extend_allocation(inode, oi->ip_clusters, | |
1021 | clusters_to_add, 0); | |
1022 | if (ret) { | |
1023 | mlog_errno(ret); | |
1024 | goto out; | |
1025 | } | |
1026 | } | |
1027 | ||
1028 | /* | |
1029 | * Call this even if we don't add any clusters to the tree. We | |
1030 | * still need to zero the area between the old i_size and the | |
1031 | * new i_size. | |
1032 | */ | |
1033 | ret = ocfs2_zero_extend(inode, di_bh, zero_to); | |
1034 | if (ret < 0) | |
1035 | mlog_errno(ret); | |
1036 | ||
1037 | out: | |
1038 | return ret; | |
1039 | } | |
1040 | ||
1041 | static int ocfs2_extend_file(struct inode *inode, | |
1042 | struct buffer_head *di_bh, | |
1043 | u64 new_i_size) | |
1044 | { | |
1045 | int ret = 0; | |
1046 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
1047 | ||
1048 | BUG_ON(!di_bh); | |
1049 | ||
1050 | /* setattr sometimes calls us like this. */ | |
1051 | if (new_i_size == 0) | |
1052 | goto out; | |
1053 | ||
1054 | if (i_size_read(inode) == new_i_size) | |
1055 | goto out; | |
1056 | BUG_ON(new_i_size < i_size_read(inode)); | |
1057 | ||
1058 | /* | |
1059 | * The alloc sem blocks people in read/write from reading our | |
1060 | * allocation until we're done changing it. We depend on | |
1061 | * i_mutex to block other extend/truncate calls while we're | |
1062 | * here. We even have to hold it for sparse files because there | |
1063 | * might be some tail zeroing. | |
1064 | */ | |
1065 | down_write(&oi->ip_alloc_sem); | |
1066 | ||
1067 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { | |
1068 | /* | |
1069 | * We can optimize small extends by keeping the inodes | |
1070 | * inline data. | |
1071 | */ | |
1072 | if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) { | |
1073 | up_write(&oi->ip_alloc_sem); | |
1074 | goto out_update_size; | |
1075 | } | |
1076 | ||
1077 | ret = ocfs2_convert_inline_data_to_extents(inode, di_bh); | |
1078 | if (ret) { | |
1079 | up_write(&oi->ip_alloc_sem); | |
1080 | mlog_errno(ret); | |
1081 | goto out; | |
1082 | } | |
1083 | } | |
1084 | ||
1085 | if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) | |
1086 | ret = ocfs2_zero_extend(inode, di_bh, new_i_size); | |
1087 | else | |
1088 | ret = ocfs2_extend_no_holes(inode, di_bh, new_i_size, | |
1089 | new_i_size); | |
1090 | ||
1091 | up_write(&oi->ip_alloc_sem); | |
1092 | ||
1093 | if (ret < 0) { | |
1094 | mlog_errno(ret); | |
1095 | goto out; | |
1096 | } | |
1097 | ||
1098 | out_update_size: | |
1099 | ret = ocfs2_simple_size_update(inode, di_bh, new_i_size); | |
1100 | if (ret < 0) | |
1101 | mlog_errno(ret); | |
1102 | ||
1103 | out: | |
1104 | return ret; | |
1105 | } | |
1106 | ||
1107 | int ocfs2_setattr(struct dentry *dentry, struct iattr *attr) | |
1108 | { | |
1109 | int status = 0, size_change; | |
1110 | struct inode *inode = dentry->d_inode; | |
1111 | struct super_block *sb = inode->i_sb; | |
1112 | struct ocfs2_super *osb = OCFS2_SB(sb); | |
1113 | struct buffer_head *bh = NULL; | |
1114 | handle_t *handle = NULL; | |
1115 | struct dquot *transfer_to[MAXQUOTAS] = { }; | |
1116 | int qtype; | |
1117 | ||
1118 | mlog_entry("(0x%p, '%.*s')\n", dentry, | |
1119 | dentry->d_name.len, dentry->d_name.name); | |
1120 | ||
1121 | /* ensuring we don't even attempt to truncate a symlink */ | |
1122 | if (S_ISLNK(inode->i_mode)) | |
1123 | attr->ia_valid &= ~ATTR_SIZE; | |
1124 | ||
1125 | if (attr->ia_valid & ATTR_MODE) | |
1126 | mlog(0, "mode change: %d\n", attr->ia_mode); | |
1127 | if (attr->ia_valid & ATTR_UID) | |
1128 | mlog(0, "uid change: %d\n", attr->ia_uid); | |
1129 | if (attr->ia_valid & ATTR_GID) | |
1130 | mlog(0, "gid change: %d\n", attr->ia_gid); | |
1131 | if (attr->ia_valid & ATTR_SIZE) | |
1132 | mlog(0, "size change...\n"); | |
1133 | if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME)) | |
1134 | mlog(0, "time change...\n"); | |
1135 | ||
1136 | #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \ | |
1137 | | ATTR_GID | ATTR_UID | ATTR_MODE) | |
1138 | if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) { | |
1139 | mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid); | |
1140 | return 0; | |
1141 | } | |
1142 | ||
1143 | status = inode_change_ok(inode, attr); | |
1144 | if (status) | |
1145 | return status; | |
1146 | ||
1147 | if (is_quota_modification(inode, attr)) | |
1148 | dquot_initialize(inode); | |
1149 | size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE; | |
1150 | if (size_change) { | |
1151 | status = ocfs2_rw_lock(inode, 1); | |
1152 | if (status < 0) { | |
1153 | mlog_errno(status); | |
1154 | goto bail; | |
1155 | } | |
1156 | } | |
1157 | ||
1158 | status = ocfs2_inode_lock(inode, &bh, 1); | |
1159 | if (status < 0) { | |
1160 | if (status != -ENOENT) | |
1161 | mlog_errno(status); | |
1162 | goto bail_unlock_rw; | |
1163 | } | |
1164 | ||
1165 | if (size_change && attr->ia_size != i_size_read(inode)) { | |
1166 | status = inode_newsize_ok(inode, attr->ia_size); | |
1167 | if (status) | |
1168 | goto bail_unlock; | |
1169 | ||
1170 | if (i_size_read(inode) > attr->ia_size) { | |
1171 | if (ocfs2_should_order_data(inode)) { | |
1172 | status = ocfs2_begin_ordered_truncate(inode, | |
1173 | attr->ia_size); | |
1174 | if (status) | |
1175 | goto bail_unlock; | |
1176 | } | |
1177 | status = ocfs2_truncate_file(inode, bh, attr->ia_size); | |
1178 | } else | |
1179 | status = ocfs2_extend_file(inode, bh, attr->ia_size); | |
1180 | if (status < 0) { | |
1181 | if (status != -ENOSPC) | |
1182 | mlog_errno(status); | |
1183 | status = -ENOSPC; | |
1184 | goto bail_unlock; | |
1185 | } | |
1186 | } | |
1187 | ||
1188 | if ((attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) || | |
1189 | (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) { | |
1190 | /* | |
1191 | * Gather pointers to quota structures so that allocation / | |
1192 | * freeing of quota structures happens here and not inside | |
1193 | * dquot_transfer() where we have problems with lock ordering | |
1194 | */ | |
1195 | if (attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid | |
1196 | && OCFS2_HAS_RO_COMPAT_FEATURE(sb, | |
1197 | OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) { | |
1198 | transfer_to[USRQUOTA] = dqget(sb, attr->ia_uid, | |
1199 | USRQUOTA); | |
1200 | if (!transfer_to[USRQUOTA]) { | |
1201 | status = -ESRCH; | |
1202 | goto bail_unlock; | |
1203 | } | |
1204 | } | |
1205 | if (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid | |
1206 | && OCFS2_HAS_RO_COMPAT_FEATURE(sb, | |
1207 | OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) { | |
1208 | transfer_to[GRPQUOTA] = dqget(sb, attr->ia_gid, | |
1209 | GRPQUOTA); | |
1210 | if (!transfer_to[GRPQUOTA]) { | |
1211 | status = -ESRCH; | |
1212 | goto bail_unlock; | |
1213 | } | |
1214 | } | |
1215 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS + | |
1216 | 2 * ocfs2_quota_trans_credits(sb)); | |
1217 | if (IS_ERR(handle)) { | |
1218 | status = PTR_ERR(handle); | |
1219 | mlog_errno(status); | |
1220 | goto bail_unlock; | |
1221 | } | |
1222 | status = __dquot_transfer(inode, transfer_to); | |
1223 | if (status < 0) | |
1224 | goto bail_commit; | |
1225 | } else { | |
1226 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); | |
1227 | if (IS_ERR(handle)) { | |
1228 | status = PTR_ERR(handle); | |
1229 | mlog_errno(status); | |
1230 | goto bail_unlock; | |
1231 | } | |
1232 | } | |
1233 | ||
1234 | /* | |
1235 | * This will intentionally not wind up calling truncate_setsize(), | |
1236 | * since all the work for a size change has been done above. | |
1237 | * Otherwise, we could get into problems with truncate as | |
1238 | * ip_alloc_sem is used there to protect against i_size | |
1239 | * changes. | |
1240 | * | |
1241 | * XXX: this means the conditional below can probably be removed. | |
1242 | */ | |
1243 | if ((attr->ia_valid & ATTR_SIZE) && | |
1244 | attr->ia_size != i_size_read(inode)) { | |
1245 | status = vmtruncate(inode, attr->ia_size); | |
1246 | if (status) { | |
1247 | mlog_errno(status); | |
1248 | goto bail_commit; | |
1249 | } | |
1250 | } | |
1251 | ||
1252 | setattr_copy(inode, attr); | |
1253 | mark_inode_dirty(inode); | |
1254 | ||
1255 | status = ocfs2_mark_inode_dirty(handle, inode, bh); | |
1256 | if (status < 0) | |
1257 | mlog_errno(status); | |
1258 | ||
1259 | bail_commit: | |
1260 | ocfs2_commit_trans(osb, handle); | |
1261 | bail_unlock: | |
1262 | ocfs2_inode_unlock(inode, 1); | |
1263 | bail_unlock_rw: | |
1264 | if (size_change) | |
1265 | ocfs2_rw_unlock(inode, 1); | |
1266 | bail: | |
1267 | brelse(bh); | |
1268 | ||
1269 | /* Release quota pointers in case we acquired them */ | |
1270 | for (qtype = 0; qtype < MAXQUOTAS; qtype++) | |
1271 | dqput(transfer_to[qtype]); | |
1272 | ||
1273 | if (!status && attr->ia_valid & ATTR_MODE) { | |
1274 | status = ocfs2_acl_chmod(inode); | |
1275 | if (status < 0) | |
1276 | mlog_errno(status); | |
1277 | } | |
1278 | ||
1279 | mlog_exit(status); | |
1280 | return status; | |
1281 | } | |
1282 | ||
1283 | int ocfs2_getattr(struct vfsmount *mnt, | |
1284 | struct dentry *dentry, | |
1285 | struct kstat *stat) | |
1286 | { | |
1287 | struct inode *inode = dentry->d_inode; | |
1288 | struct super_block *sb = dentry->d_inode->i_sb; | |
1289 | struct ocfs2_super *osb = sb->s_fs_info; | |
1290 | int err; | |
1291 | ||
1292 | mlog_entry_void(); | |
1293 | ||
1294 | err = ocfs2_inode_revalidate(dentry); | |
1295 | if (err) { | |
1296 | if (err != -ENOENT) | |
1297 | mlog_errno(err); | |
1298 | goto bail; | |
1299 | } | |
1300 | ||
1301 | generic_fillattr(inode, stat); | |
1302 | ||
1303 | /* We set the blksize from the cluster size for performance */ | |
1304 | stat->blksize = osb->s_clustersize; | |
1305 | ||
1306 | bail: | |
1307 | mlog_exit(err); | |
1308 | ||
1309 | return err; | |
1310 | } | |
1311 | ||
1312 | int ocfs2_permission(struct inode *inode, int mask) | |
1313 | { | |
1314 | int ret; | |
1315 | ||
1316 | mlog_entry_void(); | |
1317 | ||
1318 | ret = ocfs2_inode_lock(inode, NULL, 0); | |
1319 | if (ret) { | |
1320 | if (ret != -ENOENT) | |
1321 | mlog_errno(ret); | |
1322 | goto out; | |
1323 | } | |
1324 | ||
1325 | ret = generic_permission(inode, mask, ocfs2_check_acl); | |
1326 | ||
1327 | ocfs2_inode_unlock(inode, 0); | |
1328 | out: | |
1329 | mlog_exit(ret); | |
1330 | return ret; | |
1331 | } | |
1332 | ||
1333 | static int __ocfs2_write_remove_suid(struct inode *inode, | |
1334 | struct buffer_head *bh) | |
1335 | { | |
1336 | int ret; | |
1337 | handle_t *handle; | |
1338 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1339 | struct ocfs2_dinode *di; | |
1340 | ||
1341 | mlog_entry("(Inode %llu, mode 0%o)\n", | |
1342 | (unsigned long long)OCFS2_I(inode)->ip_blkno, inode->i_mode); | |
1343 | ||
1344 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); | |
1345 | if (IS_ERR(handle)) { | |
1346 | ret = PTR_ERR(handle); | |
1347 | mlog_errno(ret); | |
1348 | goto out; | |
1349 | } | |
1350 | ||
1351 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh, | |
1352 | OCFS2_JOURNAL_ACCESS_WRITE); | |
1353 | if (ret < 0) { | |
1354 | mlog_errno(ret); | |
1355 | goto out_trans; | |
1356 | } | |
1357 | ||
1358 | inode->i_mode &= ~S_ISUID; | |
1359 | if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP)) | |
1360 | inode->i_mode &= ~S_ISGID; | |
1361 | ||
1362 | di = (struct ocfs2_dinode *) bh->b_data; | |
1363 | di->i_mode = cpu_to_le16(inode->i_mode); | |
1364 | ||
1365 | ocfs2_journal_dirty(handle, bh); | |
1366 | ||
1367 | out_trans: | |
1368 | ocfs2_commit_trans(osb, handle); | |
1369 | out: | |
1370 | mlog_exit(ret); | |
1371 | return ret; | |
1372 | } | |
1373 | ||
1374 | /* | |
1375 | * Will look for holes and unwritten extents in the range starting at | |
1376 | * pos for count bytes (inclusive). | |
1377 | */ | |
1378 | static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos, | |
1379 | size_t count) | |
1380 | { | |
1381 | int ret = 0; | |
1382 | unsigned int extent_flags; | |
1383 | u32 cpos, clusters, extent_len, phys_cpos; | |
1384 | struct super_block *sb = inode->i_sb; | |
1385 | ||
1386 | cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits; | |
1387 | clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos; | |
1388 | ||
1389 | while (clusters) { | |
1390 | ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len, | |
1391 | &extent_flags); | |
1392 | if (ret < 0) { | |
1393 | mlog_errno(ret); | |
1394 | goto out; | |
1395 | } | |
1396 | ||
1397 | if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) { | |
1398 | ret = 1; | |
1399 | break; | |
1400 | } | |
1401 | ||
1402 | if (extent_len > clusters) | |
1403 | extent_len = clusters; | |
1404 | ||
1405 | clusters -= extent_len; | |
1406 | cpos += extent_len; | |
1407 | } | |
1408 | out: | |
1409 | return ret; | |
1410 | } | |
1411 | ||
1412 | static int ocfs2_write_remove_suid(struct inode *inode) | |
1413 | { | |
1414 | int ret; | |
1415 | struct buffer_head *bh = NULL; | |
1416 | ||
1417 | ret = ocfs2_read_inode_block(inode, &bh); | |
1418 | if (ret < 0) { | |
1419 | mlog_errno(ret); | |
1420 | goto out; | |
1421 | } | |
1422 | ||
1423 | ret = __ocfs2_write_remove_suid(inode, bh); | |
1424 | out: | |
1425 | brelse(bh); | |
1426 | return ret; | |
1427 | } | |
1428 | ||
1429 | /* | |
1430 | * Allocate enough extents to cover the region starting at byte offset | |
1431 | * start for len bytes. Existing extents are skipped, any extents | |
1432 | * added are marked as "unwritten". | |
1433 | */ | |
1434 | static int ocfs2_allocate_unwritten_extents(struct inode *inode, | |
1435 | u64 start, u64 len) | |
1436 | { | |
1437 | int ret; | |
1438 | u32 cpos, phys_cpos, clusters, alloc_size; | |
1439 | u64 end = start + len; | |
1440 | struct buffer_head *di_bh = NULL; | |
1441 | ||
1442 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { | |
1443 | ret = ocfs2_read_inode_block(inode, &di_bh); | |
1444 | if (ret) { | |
1445 | mlog_errno(ret); | |
1446 | goto out; | |
1447 | } | |
1448 | ||
1449 | /* | |
1450 | * Nothing to do if the requested reservation range | |
1451 | * fits within the inode. | |
1452 | */ | |
1453 | if (ocfs2_size_fits_inline_data(di_bh, end)) | |
1454 | goto out; | |
1455 | ||
1456 | ret = ocfs2_convert_inline_data_to_extents(inode, di_bh); | |
1457 | if (ret) { | |
1458 | mlog_errno(ret); | |
1459 | goto out; | |
1460 | } | |
1461 | } | |
1462 | ||
1463 | /* | |
1464 | * We consider both start and len to be inclusive. | |
1465 | */ | |
1466 | cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits; | |
1467 | clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len); | |
1468 | clusters -= cpos; | |
1469 | ||
1470 | while (clusters) { | |
1471 | ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, | |
1472 | &alloc_size, NULL); | |
1473 | if (ret) { | |
1474 | mlog_errno(ret); | |
1475 | goto out; | |
1476 | } | |
1477 | ||
1478 | /* | |
1479 | * Hole or existing extent len can be arbitrary, so | |
1480 | * cap it to our own allocation request. | |
1481 | */ | |
1482 | if (alloc_size > clusters) | |
1483 | alloc_size = clusters; | |
1484 | ||
1485 | if (phys_cpos) { | |
1486 | /* | |
1487 | * We already have an allocation at this | |
1488 | * region so we can safely skip it. | |
1489 | */ | |
1490 | goto next; | |
1491 | } | |
1492 | ||
1493 | ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1); | |
1494 | if (ret) { | |
1495 | if (ret != -ENOSPC) | |
1496 | mlog_errno(ret); | |
1497 | goto out; | |
1498 | } | |
1499 | ||
1500 | next: | |
1501 | cpos += alloc_size; | |
1502 | clusters -= alloc_size; | |
1503 | } | |
1504 | ||
1505 | ret = 0; | |
1506 | out: | |
1507 | ||
1508 | brelse(di_bh); | |
1509 | return ret; | |
1510 | } | |
1511 | ||
1512 | /* | |
1513 | * Truncate a byte range, avoiding pages within partial clusters. This | |
1514 | * preserves those pages for the zeroing code to write to. | |
1515 | */ | |
1516 | static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start, | |
1517 | u64 byte_len) | |
1518 | { | |
1519 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1520 | loff_t start, end; | |
1521 | struct address_space *mapping = inode->i_mapping; | |
1522 | ||
1523 | start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start); | |
1524 | end = byte_start + byte_len; | |
1525 | end = end & ~(osb->s_clustersize - 1); | |
1526 | ||
1527 | if (start < end) { | |
1528 | unmap_mapping_range(mapping, start, end - start, 0); | |
1529 | truncate_inode_pages_range(mapping, start, end - 1); | |
1530 | } | |
1531 | } | |
1532 | ||
1533 | static int ocfs2_zero_partial_clusters(struct inode *inode, | |
1534 | u64 start, u64 len) | |
1535 | { | |
1536 | int ret = 0; | |
1537 | u64 tmpend, end = start + len; | |
1538 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1539 | unsigned int csize = osb->s_clustersize; | |
1540 | handle_t *handle; | |
1541 | ||
1542 | /* | |
1543 | * The "start" and "end" values are NOT necessarily part of | |
1544 | * the range whose allocation is being deleted. Rather, this | |
1545 | * is what the user passed in with the request. We must zero | |
1546 | * partial clusters here. There's no need to worry about | |
1547 | * physical allocation - the zeroing code knows to skip holes. | |
1548 | */ | |
1549 | mlog(0, "byte start: %llu, end: %llu\n", | |
1550 | (unsigned long long)start, (unsigned long long)end); | |
1551 | ||
1552 | /* | |
1553 | * If both edges are on a cluster boundary then there's no | |
1554 | * zeroing required as the region is part of the allocation to | |
1555 | * be truncated. | |
1556 | */ | |
1557 | if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0) | |
1558 | goto out; | |
1559 | ||
1560 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); | |
1561 | if (IS_ERR(handle)) { | |
1562 | ret = PTR_ERR(handle); | |
1563 | mlog_errno(ret); | |
1564 | goto out; | |
1565 | } | |
1566 | ||
1567 | /* | |
1568 | * We want to get the byte offset of the end of the 1st cluster. | |
1569 | */ | |
1570 | tmpend = (u64)osb->s_clustersize + (start & ~(osb->s_clustersize - 1)); | |
1571 | if (tmpend > end) | |
1572 | tmpend = end; | |
1573 | ||
1574 | mlog(0, "1st range: start: %llu, tmpend: %llu\n", | |
1575 | (unsigned long long)start, (unsigned long long)tmpend); | |
1576 | ||
1577 | ret = ocfs2_zero_range_for_truncate(inode, handle, start, tmpend); | |
1578 | if (ret) | |
1579 | mlog_errno(ret); | |
1580 | ||
1581 | if (tmpend < end) { | |
1582 | /* | |
1583 | * This may make start and end equal, but the zeroing | |
1584 | * code will skip any work in that case so there's no | |
1585 | * need to catch it up here. | |
1586 | */ | |
1587 | start = end & ~(osb->s_clustersize - 1); | |
1588 | ||
1589 | mlog(0, "2nd range: start: %llu, end: %llu\n", | |
1590 | (unsigned long long)start, (unsigned long long)end); | |
1591 | ||
1592 | ret = ocfs2_zero_range_for_truncate(inode, handle, start, end); | |
1593 | if (ret) | |
1594 | mlog_errno(ret); | |
1595 | } | |
1596 | ||
1597 | ocfs2_commit_trans(osb, handle); | |
1598 | out: | |
1599 | return ret; | |
1600 | } | |
1601 | ||
1602 | static int ocfs2_find_rec(struct ocfs2_extent_list *el, u32 pos) | |
1603 | { | |
1604 | int i; | |
1605 | struct ocfs2_extent_rec *rec = NULL; | |
1606 | ||
1607 | for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) { | |
1608 | ||
1609 | rec = &el->l_recs[i]; | |
1610 | ||
1611 | if (le32_to_cpu(rec->e_cpos) < pos) | |
1612 | break; | |
1613 | } | |
1614 | ||
1615 | return i; | |
1616 | } | |
1617 | ||
1618 | /* | |
1619 | * Helper to calculate the punching pos and length in one run, we handle the | |
1620 | * following three cases in order: | |
1621 | * | |
1622 | * - remove the entire record | |
1623 | * - remove a partial record | |
1624 | * - no record needs to be removed (hole-punching completed) | |
1625 | */ | |
1626 | static void ocfs2_calc_trunc_pos(struct inode *inode, | |
1627 | struct ocfs2_extent_list *el, | |
1628 | struct ocfs2_extent_rec *rec, | |
1629 | u32 trunc_start, u32 *trunc_cpos, | |
1630 | u32 *trunc_len, u32 *trunc_end, | |
1631 | u64 *blkno, int *done) | |
1632 | { | |
1633 | int ret = 0; | |
1634 | u32 coff, range; | |
1635 | ||
1636 | range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec); | |
1637 | ||
1638 | if (le32_to_cpu(rec->e_cpos) >= trunc_start) { | |
1639 | *trunc_cpos = le32_to_cpu(rec->e_cpos); | |
1640 | /* | |
1641 | * Skip holes if any. | |
1642 | */ | |
1643 | if (range < *trunc_end) | |
1644 | *trunc_end = range; | |
1645 | *trunc_len = *trunc_end - le32_to_cpu(rec->e_cpos); | |
1646 | *blkno = le64_to_cpu(rec->e_blkno); | |
1647 | *trunc_end = le32_to_cpu(rec->e_cpos); | |
1648 | } else if (range > trunc_start) { | |
1649 | *trunc_cpos = trunc_start; | |
1650 | *trunc_len = *trunc_end - trunc_start; | |
1651 | coff = trunc_start - le32_to_cpu(rec->e_cpos); | |
1652 | *blkno = le64_to_cpu(rec->e_blkno) + | |
1653 | ocfs2_clusters_to_blocks(inode->i_sb, coff); | |
1654 | *trunc_end = trunc_start; | |
1655 | } else { | |
1656 | /* | |
1657 | * It may have two following possibilities: | |
1658 | * | |
1659 | * - last record has been removed | |
1660 | * - trunc_start was within a hole | |
1661 | * | |
1662 | * both two cases mean the completion of hole punching. | |
1663 | */ | |
1664 | ret = 1; | |
1665 | } | |
1666 | ||
1667 | *done = ret; | |
1668 | } | |
1669 | ||
1670 | static int ocfs2_remove_inode_range(struct inode *inode, | |
1671 | struct buffer_head *di_bh, u64 byte_start, | |
1672 | u64 byte_len) | |
1673 | { | |
1674 | int ret = 0, flags = 0, done = 0, i; | |
1675 | u32 trunc_start, trunc_len, trunc_end, trunc_cpos, phys_cpos; | |
1676 | u32 cluster_in_el; | |
1677 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1678 | struct ocfs2_cached_dealloc_ctxt dealloc; | |
1679 | struct address_space *mapping = inode->i_mapping; | |
1680 | struct ocfs2_extent_tree et; | |
1681 | struct ocfs2_path *path = NULL; | |
1682 | struct ocfs2_extent_list *el = NULL; | |
1683 | struct ocfs2_extent_rec *rec = NULL; | |
1684 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; | |
1685 | u64 blkno, refcount_loc = le64_to_cpu(di->i_refcount_loc); | |
1686 | ||
1687 | ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh); | |
1688 | ocfs2_init_dealloc_ctxt(&dealloc); | |
1689 | ||
1690 | if (byte_len == 0) | |
1691 | return 0; | |
1692 | ||
1693 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { | |
1694 | ret = ocfs2_truncate_inline(inode, di_bh, byte_start, | |
1695 | byte_start + byte_len, 0); | |
1696 | if (ret) { | |
1697 | mlog_errno(ret); | |
1698 | goto out; | |
1699 | } | |
1700 | /* | |
1701 | * There's no need to get fancy with the page cache | |
1702 | * truncate of an inline-data inode. We're talking | |
1703 | * about less than a page here, which will be cached | |
1704 | * in the dinode buffer anyway. | |
1705 | */ | |
1706 | unmap_mapping_range(mapping, 0, 0, 0); | |
1707 | truncate_inode_pages(mapping, 0); | |
1708 | goto out; | |
1709 | } | |
1710 | ||
1711 | /* | |
1712 | * For reflinks, we may need to CoW 2 clusters which might be | |
1713 | * partially zero'd later, if hole's start and end offset were | |
1714 | * within one cluster(means is not exactly aligned to clustersize). | |
1715 | */ | |
1716 | ||
1717 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) { | |
1718 | ||
1719 | ret = ocfs2_cow_file_pos(inode, di_bh, byte_start); | |
1720 | if (ret) { | |
1721 | mlog_errno(ret); | |
1722 | goto out; | |
1723 | } | |
1724 | ||
1725 | ret = ocfs2_cow_file_pos(inode, di_bh, byte_start + byte_len); | |
1726 | if (ret) { | |
1727 | mlog_errno(ret); | |
1728 | goto out; | |
1729 | } | |
1730 | } | |
1731 | ||
1732 | trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start); | |
1733 | trunc_end = (byte_start + byte_len) >> osb->s_clustersize_bits; | |
1734 | cluster_in_el = trunc_end; | |
1735 | ||
1736 | mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, cend: %u\n", | |
1737 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1738 | (unsigned long long)byte_start, | |
1739 | (unsigned long long)byte_len, trunc_start, trunc_end); | |
1740 | ||
1741 | ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len); | |
1742 | if (ret) { | |
1743 | mlog_errno(ret); | |
1744 | goto out; | |
1745 | } | |
1746 | ||
1747 | path = ocfs2_new_path_from_et(&et); | |
1748 | if (!path) { | |
1749 | ret = -ENOMEM; | |
1750 | mlog_errno(ret); | |
1751 | goto out; | |
1752 | } | |
1753 | ||
1754 | while (trunc_end > trunc_start) { | |
1755 | ||
1756 | ret = ocfs2_find_path(INODE_CACHE(inode), path, | |
1757 | cluster_in_el); | |
1758 | if (ret) { | |
1759 | mlog_errno(ret); | |
1760 | goto out; | |
1761 | } | |
1762 | ||
1763 | el = path_leaf_el(path); | |
1764 | ||
1765 | i = ocfs2_find_rec(el, trunc_end); | |
1766 | /* | |
1767 | * Need to go to previous extent block. | |
1768 | */ | |
1769 | if (i < 0) { | |
1770 | if (path->p_tree_depth == 0) | |
1771 | break; | |
1772 | ||
1773 | ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb, | |
1774 | path, | |
1775 | &cluster_in_el); | |
1776 | if (ret) { | |
1777 | mlog_errno(ret); | |
1778 | goto out; | |
1779 | } | |
1780 | ||
1781 | /* | |
1782 | * We've reached the leftmost extent block, | |
1783 | * it's safe to leave. | |
1784 | */ | |
1785 | if (cluster_in_el == 0) | |
1786 | break; | |
1787 | ||
1788 | /* | |
1789 | * The 'pos' searched for previous extent block is | |
1790 | * always one cluster less than actual trunc_end. | |
1791 | */ | |
1792 | trunc_end = cluster_in_el + 1; | |
1793 | ||
1794 | ocfs2_reinit_path(path, 1); | |
1795 | ||
1796 | continue; | |
1797 | ||
1798 | } else | |
1799 | rec = &el->l_recs[i]; | |
1800 | ||
1801 | ocfs2_calc_trunc_pos(inode, el, rec, trunc_start, &trunc_cpos, | |
1802 | &trunc_len, &trunc_end, &blkno, &done); | |
1803 | if (done) | |
1804 | break; | |
1805 | ||
1806 | flags = rec->e_flags; | |
1807 | phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, blkno); | |
1808 | ||
1809 | ret = ocfs2_remove_btree_range(inode, &et, trunc_cpos, | |
1810 | phys_cpos, trunc_len, flags, | |
1811 | &dealloc, refcount_loc); | |
1812 | if (ret < 0) { | |
1813 | mlog_errno(ret); | |
1814 | goto out; | |
1815 | } | |
1816 | ||
1817 | cluster_in_el = trunc_end; | |
1818 | ||
1819 | ocfs2_reinit_path(path, 1); | |
1820 | } | |
1821 | ||
1822 | ocfs2_truncate_cluster_pages(inode, byte_start, byte_len); | |
1823 | ||
1824 | out: | |
1825 | ocfs2_schedule_truncate_log_flush(osb, 1); | |
1826 | ocfs2_run_deallocs(osb, &dealloc); | |
1827 | ||
1828 | return ret; | |
1829 | } | |
1830 | ||
1831 | /* | |
1832 | * Parts of this function taken from xfs_change_file_space() | |
1833 | */ | |
1834 | static int __ocfs2_change_file_space(struct file *file, struct inode *inode, | |
1835 | loff_t f_pos, unsigned int cmd, | |
1836 | struct ocfs2_space_resv *sr, | |
1837 | int change_size) | |
1838 | { | |
1839 | int ret; | |
1840 | s64 llen; | |
1841 | loff_t size; | |
1842 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1843 | struct buffer_head *di_bh = NULL; | |
1844 | handle_t *handle; | |
1845 | unsigned long long max_off = inode->i_sb->s_maxbytes; | |
1846 | ||
1847 | if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) | |
1848 | return -EROFS; | |
1849 | ||
1850 | mutex_lock(&inode->i_mutex); | |
1851 | ||
1852 | /* | |
1853 | * This prevents concurrent writes on other nodes | |
1854 | */ | |
1855 | ret = ocfs2_rw_lock(inode, 1); | |
1856 | if (ret) { | |
1857 | mlog_errno(ret); | |
1858 | goto out; | |
1859 | } | |
1860 | ||
1861 | ret = ocfs2_inode_lock(inode, &di_bh, 1); | |
1862 | if (ret) { | |
1863 | mlog_errno(ret); | |
1864 | goto out_rw_unlock; | |
1865 | } | |
1866 | ||
1867 | if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) { | |
1868 | ret = -EPERM; | |
1869 | goto out_inode_unlock; | |
1870 | } | |
1871 | ||
1872 | switch (sr->l_whence) { | |
1873 | case 0: /*SEEK_SET*/ | |
1874 | break; | |
1875 | case 1: /*SEEK_CUR*/ | |
1876 | sr->l_start += f_pos; | |
1877 | break; | |
1878 | case 2: /*SEEK_END*/ | |
1879 | sr->l_start += i_size_read(inode); | |
1880 | break; | |
1881 | default: | |
1882 | ret = -EINVAL; | |
1883 | goto out_inode_unlock; | |
1884 | } | |
1885 | sr->l_whence = 0; | |
1886 | ||
1887 | llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len; | |
1888 | ||
1889 | if (sr->l_start < 0 | |
1890 | || sr->l_start > max_off | |
1891 | || (sr->l_start + llen) < 0 | |
1892 | || (sr->l_start + llen) > max_off) { | |
1893 | ret = -EINVAL; | |
1894 | goto out_inode_unlock; | |
1895 | } | |
1896 | size = sr->l_start + sr->l_len; | |
1897 | ||
1898 | if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) { | |
1899 | if (sr->l_len <= 0) { | |
1900 | ret = -EINVAL; | |
1901 | goto out_inode_unlock; | |
1902 | } | |
1903 | } | |
1904 | ||
1905 | if (file && should_remove_suid(file->f_path.dentry)) { | |
1906 | ret = __ocfs2_write_remove_suid(inode, di_bh); | |
1907 | if (ret) { | |
1908 | mlog_errno(ret); | |
1909 | goto out_inode_unlock; | |
1910 | } | |
1911 | } | |
1912 | ||
1913 | down_write(&OCFS2_I(inode)->ip_alloc_sem); | |
1914 | switch (cmd) { | |
1915 | case OCFS2_IOC_RESVSP: | |
1916 | case OCFS2_IOC_RESVSP64: | |
1917 | /* | |
1918 | * This takes unsigned offsets, but the signed ones we | |
1919 | * pass have been checked against overflow above. | |
1920 | */ | |
1921 | ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start, | |
1922 | sr->l_len); | |
1923 | break; | |
1924 | case OCFS2_IOC_UNRESVSP: | |
1925 | case OCFS2_IOC_UNRESVSP64: | |
1926 | ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start, | |
1927 | sr->l_len); | |
1928 | break; | |
1929 | default: | |
1930 | ret = -EINVAL; | |
1931 | } | |
1932 | up_write(&OCFS2_I(inode)->ip_alloc_sem); | |
1933 | if (ret) { | |
1934 | mlog_errno(ret); | |
1935 | goto out_inode_unlock; | |
1936 | } | |
1937 | ||
1938 | /* | |
1939 | * We update c/mtime for these changes | |
1940 | */ | |
1941 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); | |
1942 | if (IS_ERR(handle)) { | |
1943 | ret = PTR_ERR(handle); | |
1944 | mlog_errno(ret); | |
1945 | goto out_inode_unlock; | |
1946 | } | |
1947 | ||
1948 | if (change_size && i_size_read(inode) < size) | |
1949 | i_size_write(inode, size); | |
1950 | ||
1951 | inode->i_ctime = inode->i_mtime = CURRENT_TIME; | |
1952 | ret = ocfs2_mark_inode_dirty(handle, inode, di_bh); | |
1953 | if (ret < 0) | |
1954 | mlog_errno(ret); | |
1955 | ||
1956 | ocfs2_commit_trans(osb, handle); | |
1957 | ||
1958 | out_inode_unlock: | |
1959 | brelse(di_bh); | |
1960 | ocfs2_inode_unlock(inode, 1); | |
1961 | out_rw_unlock: | |
1962 | ocfs2_rw_unlock(inode, 1); | |
1963 | ||
1964 | out: | |
1965 | mutex_unlock(&inode->i_mutex); | |
1966 | return ret; | |
1967 | } | |
1968 | ||
1969 | int ocfs2_change_file_space(struct file *file, unsigned int cmd, | |
1970 | struct ocfs2_space_resv *sr) | |
1971 | { | |
1972 | struct inode *inode = file->f_path.dentry->d_inode; | |
1973 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1974 | ||
1975 | if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) && | |
1976 | !ocfs2_writes_unwritten_extents(osb)) | |
1977 | return -ENOTTY; | |
1978 | else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) && | |
1979 | !ocfs2_sparse_alloc(osb)) | |
1980 | return -ENOTTY; | |
1981 | ||
1982 | if (!S_ISREG(inode->i_mode)) | |
1983 | return -EINVAL; | |
1984 | ||
1985 | if (!(file->f_mode & FMODE_WRITE)) | |
1986 | return -EBADF; | |
1987 | ||
1988 | return __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0); | |
1989 | } | |
1990 | ||
1991 | static long ocfs2_fallocate(struct inode *inode, int mode, loff_t offset, | |
1992 | loff_t len) | |
1993 | { | |
1994 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1995 | struct ocfs2_space_resv sr; | |
1996 | int change_size = 1; | |
1997 | ||
1998 | if (!ocfs2_writes_unwritten_extents(osb)) | |
1999 | return -EOPNOTSUPP; | |
2000 | ||
2001 | if (S_ISDIR(inode->i_mode)) | |
2002 | return -ENODEV; | |
2003 | ||
2004 | if (mode & FALLOC_FL_KEEP_SIZE) | |
2005 | change_size = 0; | |
2006 | ||
2007 | sr.l_whence = 0; | |
2008 | sr.l_start = (s64)offset; | |
2009 | sr.l_len = (s64)len; | |
2010 | ||
2011 | return __ocfs2_change_file_space(NULL, inode, offset, | |
2012 | OCFS2_IOC_RESVSP64, &sr, change_size); | |
2013 | } | |
2014 | ||
2015 | int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos, | |
2016 | size_t count) | |
2017 | { | |
2018 | int ret = 0; | |
2019 | unsigned int extent_flags; | |
2020 | u32 cpos, clusters, extent_len, phys_cpos; | |
2021 | struct super_block *sb = inode->i_sb; | |
2022 | ||
2023 | if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) || | |
2024 | !(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) || | |
2025 | OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) | |
2026 | return 0; | |
2027 | ||
2028 | cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits; | |
2029 | clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos; | |
2030 | ||
2031 | while (clusters) { | |
2032 | ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len, | |
2033 | &extent_flags); | |
2034 | if (ret < 0) { | |
2035 | mlog_errno(ret); | |
2036 | goto out; | |
2037 | } | |
2038 | ||
2039 | if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) { | |
2040 | ret = 1; | |
2041 | break; | |
2042 | } | |
2043 | ||
2044 | if (extent_len > clusters) | |
2045 | extent_len = clusters; | |
2046 | ||
2047 | clusters -= extent_len; | |
2048 | cpos += extent_len; | |
2049 | } | |
2050 | out: | |
2051 | return ret; | |
2052 | } | |
2053 | ||
2054 | static int ocfs2_prepare_inode_for_refcount(struct inode *inode, | |
2055 | struct file *file, | |
2056 | loff_t pos, size_t count, | |
2057 | int *meta_level) | |
2058 | { | |
2059 | int ret; | |
2060 | struct buffer_head *di_bh = NULL; | |
2061 | u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits; | |
2062 | u32 clusters = | |
2063 | ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos; | |
2064 | ||
2065 | ret = ocfs2_inode_lock(inode, &di_bh, 1); | |
2066 | if (ret) { | |
2067 | mlog_errno(ret); | |
2068 | goto out; | |
2069 | } | |
2070 | ||
2071 | *meta_level = 1; | |
2072 | ||
2073 | ret = ocfs2_refcount_cow(inode, file, di_bh, cpos, clusters, UINT_MAX); | |
2074 | if (ret) | |
2075 | mlog_errno(ret); | |
2076 | out: | |
2077 | brelse(di_bh); | |
2078 | return ret; | |
2079 | } | |
2080 | ||
2081 | static int ocfs2_prepare_inode_for_write(struct file *file, | |
2082 | loff_t *ppos, | |
2083 | size_t count, | |
2084 | int appending, | |
2085 | int *direct_io, | |
2086 | int *has_refcount) | |
2087 | { | |
2088 | int ret = 0, meta_level = 0; | |
2089 | struct dentry *dentry = file->f_path.dentry; | |
2090 | struct inode *inode = dentry->d_inode; | |
2091 | loff_t saved_pos, end; | |
2092 | ||
2093 | /* | |
2094 | * We start with a read level meta lock and only jump to an ex | |
2095 | * if we need to make modifications here. | |
2096 | */ | |
2097 | for(;;) { | |
2098 | ret = ocfs2_inode_lock(inode, NULL, meta_level); | |
2099 | if (ret < 0) { | |
2100 | meta_level = -1; | |
2101 | mlog_errno(ret); | |
2102 | goto out; | |
2103 | } | |
2104 | ||
2105 | /* Clear suid / sgid if necessary. We do this here | |
2106 | * instead of later in the write path because | |
2107 | * remove_suid() calls ->setattr without any hint that | |
2108 | * we may have already done our cluster locking. Since | |
2109 | * ocfs2_setattr() *must* take cluster locks to | |
2110 | * proceeed, this will lead us to recursively lock the | |
2111 | * inode. There's also the dinode i_size state which | |
2112 | * can be lost via setattr during extending writes (we | |
2113 | * set inode->i_size at the end of a write. */ | |
2114 | if (should_remove_suid(dentry)) { | |
2115 | if (meta_level == 0) { | |
2116 | ocfs2_inode_unlock(inode, meta_level); | |
2117 | meta_level = 1; | |
2118 | continue; | |
2119 | } | |
2120 | ||
2121 | ret = ocfs2_write_remove_suid(inode); | |
2122 | if (ret < 0) { | |
2123 | mlog_errno(ret); | |
2124 | goto out_unlock; | |
2125 | } | |
2126 | } | |
2127 | ||
2128 | /* work on a copy of ppos until we're sure that we won't have | |
2129 | * to recalculate it due to relocking. */ | |
2130 | if (appending) { | |
2131 | saved_pos = i_size_read(inode); | |
2132 | mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos); | |
2133 | } else { | |
2134 | saved_pos = *ppos; | |
2135 | } | |
2136 | ||
2137 | end = saved_pos + count; | |
2138 | ||
2139 | ret = ocfs2_check_range_for_refcount(inode, saved_pos, count); | |
2140 | if (ret == 1) { | |
2141 | ocfs2_inode_unlock(inode, meta_level); | |
2142 | meta_level = -1; | |
2143 | ||
2144 | ret = ocfs2_prepare_inode_for_refcount(inode, | |
2145 | file, | |
2146 | saved_pos, | |
2147 | count, | |
2148 | &meta_level); | |
2149 | if (has_refcount) | |
2150 | *has_refcount = 1; | |
2151 | if (direct_io) | |
2152 | *direct_io = 0; | |
2153 | } | |
2154 | ||
2155 | if (ret < 0) { | |
2156 | mlog_errno(ret); | |
2157 | goto out_unlock; | |
2158 | } | |
2159 | ||
2160 | /* | |
2161 | * Skip the O_DIRECT checks if we don't need | |
2162 | * them. | |
2163 | */ | |
2164 | if (!direct_io || !(*direct_io)) | |
2165 | break; | |
2166 | ||
2167 | /* | |
2168 | * There's no sane way to do direct writes to an inode | |
2169 | * with inline data. | |
2170 | */ | |
2171 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { | |
2172 | *direct_io = 0; | |
2173 | break; | |
2174 | } | |
2175 | ||
2176 | /* | |
2177 | * Allowing concurrent direct writes means | |
2178 | * i_size changes wouldn't be synchronized, so | |
2179 | * one node could wind up truncating another | |
2180 | * nodes writes. | |
2181 | */ | |
2182 | if (end > i_size_read(inode)) { | |
2183 | *direct_io = 0; | |
2184 | break; | |
2185 | } | |
2186 | ||
2187 | /* | |
2188 | * We don't fill holes during direct io, so | |
2189 | * check for them here. If any are found, the | |
2190 | * caller will have to retake some cluster | |
2191 | * locks and initiate the io as buffered. | |
2192 | */ | |
2193 | ret = ocfs2_check_range_for_holes(inode, saved_pos, count); | |
2194 | if (ret == 1) { | |
2195 | *direct_io = 0; | |
2196 | ret = 0; | |
2197 | } else if (ret < 0) | |
2198 | mlog_errno(ret); | |
2199 | break; | |
2200 | } | |
2201 | ||
2202 | if (appending) | |
2203 | *ppos = saved_pos; | |
2204 | ||
2205 | out_unlock: | |
2206 | if (meta_level >= 0) | |
2207 | ocfs2_inode_unlock(inode, meta_level); | |
2208 | ||
2209 | out: | |
2210 | return ret; | |
2211 | } | |
2212 | ||
2213 | static ssize_t ocfs2_file_aio_write(struct kiocb *iocb, | |
2214 | const struct iovec *iov, | |
2215 | unsigned long nr_segs, | |
2216 | loff_t pos) | |
2217 | { | |
2218 | int ret, direct_io, appending, rw_level, have_alloc_sem = 0; | |
2219 | int can_do_direct, has_refcount = 0; | |
2220 | ssize_t written = 0; | |
2221 | size_t ocount; /* original count */ | |
2222 | size_t count; /* after file limit checks */ | |
2223 | loff_t old_size, *ppos = &iocb->ki_pos; | |
2224 | u32 old_clusters; | |
2225 | struct file *file = iocb->ki_filp; | |
2226 | struct inode *inode = file->f_path.dentry->d_inode; | |
2227 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
2228 | ||
2229 | mlog_entry("(0x%p, %u, '%.*s')\n", file, | |
2230 | (unsigned int)nr_segs, | |
2231 | file->f_path.dentry->d_name.len, | |
2232 | file->f_path.dentry->d_name.name); | |
2233 | ||
2234 | if (iocb->ki_left == 0) | |
2235 | return 0; | |
2236 | ||
2237 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); | |
2238 | ||
2239 | appending = file->f_flags & O_APPEND ? 1 : 0; | |
2240 | direct_io = file->f_flags & O_DIRECT ? 1 : 0; | |
2241 | ||
2242 | mutex_lock(&inode->i_mutex); | |
2243 | ||
2244 | relock: | |
2245 | /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */ | |
2246 | if (direct_io) { | |
2247 | down_read(&inode->i_alloc_sem); | |
2248 | have_alloc_sem = 1; | |
2249 | } | |
2250 | ||
2251 | /* concurrent O_DIRECT writes are allowed */ | |
2252 | rw_level = !direct_io; | |
2253 | ret = ocfs2_rw_lock(inode, rw_level); | |
2254 | if (ret < 0) { | |
2255 | mlog_errno(ret); | |
2256 | goto out_sems; | |
2257 | } | |
2258 | ||
2259 | can_do_direct = direct_io; | |
2260 | ret = ocfs2_prepare_inode_for_write(file, ppos, | |
2261 | iocb->ki_left, appending, | |
2262 | &can_do_direct, &has_refcount); | |
2263 | if (ret < 0) { | |
2264 | mlog_errno(ret); | |
2265 | goto out; | |
2266 | } | |
2267 | ||
2268 | /* | |
2269 | * We can't complete the direct I/O as requested, fall back to | |
2270 | * buffered I/O. | |
2271 | */ | |
2272 | if (direct_io && !can_do_direct) { | |
2273 | ocfs2_rw_unlock(inode, rw_level); | |
2274 | up_read(&inode->i_alloc_sem); | |
2275 | ||
2276 | have_alloc_sem = 0; | |
2277 | rw_level = -1; | |
2278 | ||
2279 | direct_io = 0; | |
2280 | goto relock; | |
2281 | } | |
2282 | ||
2283 | /* | |
2284 | * To later detect whether a journal commit for sync writes is | |
2285 | * necessary, we sample i_size, and cluster count here. | |
2286 | */ | |
2287 | old_size = i_size_read(inode); | |
2288 | old_clusters = OCFS2_I(inode)->ip_clusters; | |
2289 | ||
2290 | /* communicate with ocfs2_dio_end_io */ | |
2291 | ocfs2_iocb_set_rw_locked(iocb, rw_level); | |
2292 | ||
2293 | ret = generic_segment_checks(iov, &nr_segs, &ocount, | |
2294 | VERIFY_READ); | |
2295 | if (ret) | |
2296 | goto out_dio; | |
2297 | ||
2298 | count = ocount; | |
2299 | ret = generic_write_checks(file, ppos, &count, | |
2300 | S_ISBLK(inode->i_mode)); | |
2301 | if (ret) | |
2302 | goto out_dio; | |
2303 | ||
2304 | if (direct_io) { | |
2305 | written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos, | |
2306 | ppos, count, ocount); | |
2307 | if (written < 0) { | |
2308 | ret = written; | |
2309 | goto out_dio; | |
2310 | } | |
2311 | } else { | |
2312 | current->backing_dev_info = file->f_mapping->backing_dev_info; | |
2313 | written = generic_file_buffered_write(iocb, iov, nr_segs, *ppos, | |
2314 | ppos, count, 0); | |
2315 | current->backing_dev_info = NULL; | |
2316 | } | |
2317 | ||
2318 | out_dio: | |
2319 | /* buffered aio wouldn't have proper lock coverage today */ | |
2320 | BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT)); | |
2321 | ||
2322 | if (((file->f_flags & O_DSYNC) && !direct_io) || IS_SYNC(inode) || | |
2323 | ((file->f_flags & O_DIRECT) && !direct_io)) { | |
2324 | ret = filemap_fdatawrite_range(file->f_mapping, pos, | |
2325 | pos + count - 1); | |
2326 | if (ret < 0) | |
2327 | written = ret; | |
2328 | ||
2329 | if (!ret && ((old_size != i_size_read(inode)) || | |
2330 | (old_clusters != OCFS2_I(inode)->ip_clusters) || | |
2331 | has_refcount)) { | |
2332 | ret = jbd2_journal_force_commit(osb->journal->j_journal); | |
2333 | if (ret < 0) | |
2334 | written = ret; | |
2335 | } | |
2336 | ||
2337 | if (!ret) | |
2338 | ret = filemap_fdatawait_range(file->f_mapping, pos, | |
2339 | pos + count - 1); | |
2340 | } | |
2341 | ||
2342 | /* | |
2343 | * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io | |
2344 | * function pointer which is called when o_direct io completes so that | |
2345 | * it can unlock our rw lock. (it's the clustered equivalent of | |
2346 | * i_alloc_sem; protects truncate from racing with pending ios). | |
2347 | * Unfortunately there are error cases which call end_io and others | |
2348 | * that don't. so we don't have to unlock the rw_lock if either an | |
2349 | * async dio is going to do it in the future or an end_io after an | |
2350 | * error has already done it. | |
2351 | */ | |
2352 | if ((ret == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) { | |
2353 | rw_level = -1; | |
2354 | have_alloc_sem = 0; | |
2355 | } | |
2356 | ||
2357 | out: | |
2358 | if (rw_level != -1) | |
2359 | ocfs2_rw_unlock(inode, rw_level); | |
2360 | ||
2361 | out_sems: | |
2362 | if (have_alloc_sem) | |
2363 | up_read(&inode->i_alloc_sem); | |
2364 | ||
2365 | mutex_unlock(&inode->i_mutex); | |
2366 | ||
2367 | if (written) | |
2368 | ret = written; | |
2369 | mlog_exit(ret); | |
2370 | return ret; | |
2371 | } | |
2372 | ||
2373 | static int ocfs2_splice_to_file(struct pipe_inode_info *pipe, | |
2374 | struct file *out, | |
2375 | struct splice_desc *sd) | |
2376 | { | |
2377 | int ret; | |
2378 | ||
2379 | ret = ocfs2_prepare_inode_for_write(out, &sd->pos, | |
2380 | sd->total_len, 0, NULL, NULL); | |
2381 | if (ret < 0) { | |
2382 | mlog_errno(ret); | |
2383 | return ret; | |
2384 | } | |
2385 | ||
2386 | return splice_from_pipe_feed(pipe, sd, pipe_to_file); | |
2387 | } | |
2388 | ||
2389 | static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe, | |
2390 | struct file *out, | |
2391 | loff_t *ppos, | |
2392 | size_t len, | |
2393 | unsigned int flags) | |
2394 | { | |
2395 | int ret; | |
2396 | struct address_space *mapping = out->f_mapping; | |
2397 | struct inode *inode = mapping->host; | |
2398 | struct splice_desc sd = { | |
2399 | .total_len = len, | |
2400 | .flags = flags, | |
2401 | .pos = *ppos, | |
2402 | .u.file = out, | |
2403 | }; | |
2404 | ||
2405 | mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out, pipe, | |
2406 | (unsigned int)len, | |
2407 | out->f_path.dentry->d_name.len, | |
2408 | out->f_path.dentry->d_name.name); | |
2409 | ||
2410 | if (pipe->inode) | |
2411 | mutex_lock_nested(&pipe->inode->i_mutex, I_MUTEX_PARENT); | |
2412 | ||
2413 | splice_from_pipe_begin(&sd); | |
2414 | do { | |
2415 | ret = splice_from_pipe_next(pipe, &sd); | |
2416 | if (ret <= 0) | |
2417 | break; | |
2418 | ||
2419 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); | |
2420 | ret = ocfs2_rw_lock(inode, 1); | |
2421 | if (ret < 0) | |
2422 | mlog_errno(ret); | |
2423 | else { | |
2424 | ret = ocfs2_splice_to_file(pipe, out, &sd); | |
2425 | ocfs2_rw_unlock(inode, 1); | |
2426 | } | |
2427 | mutex_unlock(&inode->i_mutex); | |
2428 | } while (ret > 0); | |
2429 | splice_from_pipe_end(pipe, &sd); | |
2430 | ||
2431 | if (pipe->inode) | |
2432 | mutex_unlock(&pipe->inode->i_mutex); | |
2433 | ||
2434 | if (sd.num_spliced) | |
2435 | ret = sd.num_spliced; | |
2436 | ||
2437 | if (ret > 0) { | |
2438 | unsigned long nr_pages; | |
2439 | int err; | |
2440 | ||
2441 | nr_pages = (ret + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
2442 | ||
2443 | err = generic_write_sync(out, *ppos, ret); | |
2444 | if (err) | |
2445 | ret = err; | |
2446 | else | |
2447 | *ppos += ret; | |
2448 | ||
2449 | balance_dirty_pages_ratelimited_nr(mapping, nr_pages); | |
2450 | } | |
2451 | ||
2452 | mlog_exit(ret); | |
2453 | return ret; | |
2454 | } | |
2455 | ||
2456 | static ssize_t ocfs2_file_splice_read(struct file *in, | |
2457 | loff_t *ppos, | |
2458 | struct pipe_inode_info *pipe, | |
2459 | size_t len, | |
2460 | unsigned int flags) | |
2461 | { | |
2462 | int ret = 0, lock_level = 0; | |
2463 | struct inode *inode = in->f_path.dentry->d_inode; | |
2464 | ||
2465 | mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe, | |
2466 | (unsigned int)len, | |
2467 | in->f_path.dentry->d_name.len, | |
2468 | in->f_path.dentry->d_name.name); | |
2469 | ||
2470 | /* | |
2471 | * See the comment in ocfs2_file_aio_read() | |
2472 | */ | |
2473 | ret = ocfs2_inode_lock_atime(inode, in->f_vfsmnt, &lock_level); | |
2474 | if (ret < 0) { | |
2475 | mlog_errno(ret); | |
2476 | goto bail; | |
2477 | } | |
2478 | ocfs2_inode_unlock(inode, lock_level); | |
2479 | ||
2480 | ret = generic_file_splice_read(in, ppos, pipe, len, flags); | |
2481 | ||
2482 | bail: | |
2483 | mlog_exit(ret); | |
2484 | return ret; | |
2485 | } | |
2486 | ||
2487 | static ssize_t ocfs2_file_aio_read(struct kiocb *iocb, | |
2488 | const struct iovec *iov, | |
2489 | unsigned long nr_segs, | |
2490 | loff_t pos) | |
2491 | { | |
2492 | int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0; | |
2493 | struct file *filp = iocb->ki_filp; | |
2494 | struct inode *inode = filp->f_path.dentry->d_inode; | |
2495 | ||
2496 | mlog_entry("(0x%p, %u, '%.*s')\n", filp, | |
2497 | (unsigned int)nr_segs, | |
2498 | filp->f_path.dentry->d_name.len, | |
2499 | filp->f_path.dentry->d_name.name); | |
2500 | ||
2501 | if (!inode) { | |
2502 | ret = -EINVAL; | |
2503 | mlog_errno(ret); | |
2504 | goto bail; | |
2505 | } | |
2506 | ||
2507 | /* | |
2508 | * buffered reads protect themselves in ->readpage(). O_DIRECT reads | |
2509 | * need locks to protect pending reads from racing with truncate. | |
2510 | */ | |
2511 | if (filp->f_flags & O_DIRECT) { | |
2512 | down_read(&inode->i_alloc_sem); | |
2513 | have_alloc_sem = 1; | |
2514 | ||
2515 | ret = ocfs2_rw_lock(inode, 0); | |
2516 | if (ret < 0) { | |
2517 | mlog_errno(ret); | |
2518 | goto bail; | |
2519 | } | |
2520 | rw_level = 0; | |
2521 | /* communicate with ocfs2_dio_end_io */ | |
2522 | ocfs2_iocb_set_rw_locked(iocb, rw_level); | |
2523 | } | |
2524 | ||
2525 | /* | |
2526 | * We're fine letting folks race truncates and extending | |
2527 | * writes with read across the cluster, just like they can | |
2528 | * locally. Hence no rw_lock during read. | |
2529 | * | |
2530 | * Take and drop the meta data lock to update inode fields | |
2531 | * like i_size. This allows the checks down below | |
2532 | * generic_file_aio_read() a chance of actually working. | |
2533 | */ | |
2534 | ret = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level); | |
2535 | if (ret < 0) { | |
2536 | mlog_errno(ret); | |
2537 | goto bail; | |
2538 | } | |
2539 | ocfs2_inode_unlock(inode, lock_level); | |
2540 | ||
2541 | ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos); | |
2542 | if (ret == -EINVAL) | |
2543 | mlog(0, "generic_file_aio_read returned -EINVAL\n"); | |
2544 | ||
2545 | /* buffered aio wouldn't have proper lock coverage today */ | |
2546 | BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT)); | |
2547 | ||
2548 | /* see ocfs2_file_aio_write */ | |
2549 | if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) { | |
2550 | rw_level = -1; | |
2551 | have_alloc_sem = 0; | |
2552 | } | |
2553 | ||
2554 | bail: | |
2555 | if (have_alloc_sem) | |
2556 | up_read(&inode->i_alloc_sem); | |
2557 | if (rw_level != -1) | |
2558 | ocfs2_rw_unlock(inode, rw_level); | |
2559 | mlog_exit(ret); | |
2560 | ||
2561 | return ret; | |
2562 | } | |
2563 | ||
2564 | const struct inode_operations ocfs2_file_iops = { | |
2565 | .setattr = ocfs2_setattr, | |
2566 | .getattr = ocfs2_getattr, | |
2567 | .permission = ocfs2_permission, | |
2568 | .setxattr = generic_setxattr, | |
2569 | .getxattr = generic_getxattr, | |
2570 | .listxattr = ocfs2_listxattr, | |
2571 | .removexattr = generic_removexattr, | |
2572 | .fallocate = ocfs2_fallocate, | |
2573 | .fiemap = ocfs2_fiemap, | |
2574 | }; | |
2575 | ||
2576 | const struct inode_operations ocfs2_special_file_iops = { | |
2577 | .setattr = ocfs2_setattr, | |
2578 | .getattr = ocfs2_getattr, | |
2579 | .permission = ocfs2_permission, | |
2580 | }; | |
2581 | ||
2582 | /* | |
2583 | * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with | |
2584 | * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks! | |
2585 | */ | |
2586 | const struct file_operations ocfs2_fops = { | |
2587 | .llseek = generic_file_llseek, | |
2588 | .read = do_sync_read, | |
2589 | .write = do_sync_write, | |
2590 | .mmap = ocfs2_mmap, | |
2591 | .fsync = ocfs2_sync_file, | |
2592 | .release = ocfs2_file_release, | |
2593 | .open = ocfs2_file_open, | |
2594 | .aio_read = ocfs2_file_aio_read, | |
2595 | .aio_write = ocfs2_file_aio_write, | |
2596 | .unlocked_ioctl = ocfs2_ioctl, | |
2597 | #ifdef CONFIG_COMPAT | |
2598 | .compat_ioctl = ocfs2_compat_ioctl, | |
2599 | #endif | |
2600 | .lock = ocfs2_lock, | |
2601 | .flock = ocfs2_flock, | |
2602 | .splice_read = ocfs2_file_splice_read, | |
2603 | .splice_write = ocfs2_file_splice_write, | |
2604 | }; | |
2605 | ||
2606 | const struct file_operations ocfs2_dops = { | |
2607 | .llseek = generic_file_llseek, | |
2608 | .read = generic_read_dir, | |
2609 | .readdir = ocfs2_readdir, | |
2610 | .fsync = ocfs2_sync_file, | |
2611 | .release = ocfs2_dir_release, | |
2612 | .open = ocfs2_dir_open, | |
2613 | .unlocked_ioctl = ocfs2_ioctl, | |
2614 | #ifdef CONFIG_COMPAT | |
2615 | .compat_ioctl = ocfs2_compat_ioctl, | |
2616 | #endif | |
2617 | .lock = ocfs2_lock, | |
2618 | .flock = ocfs2_flock, | |
2619 | }; | |
2620 | ||
2621 | /* | |
2622 | * POSIX-lockless variants of our file_operations. | |
2623 | * | |
2624 | * These will be used if the underlying cluster stack does not support | |
2625 | * posix file locking, if the user passes the "localflocks" mount | |
2626 | * option, or if we have a local-only fs. | |
2627 | * | |
2628 | * ocfs2_flock is in here because all stacks handle UNIX file locks, | |
2629 | * so we still want it in the case of no stack support for | |
2630 | * plocks. Internally, it will do the right thing when asked to ignore | |
2631 | * the cluster. | |
2632 | */ | |
2633 | const struct file_operations ocfs2_fops_no_plocks = { | |
2634 | .llseek = generic_file_llseek, | |
2635 | .read = do_sync_read, | |
2636 | .write = do_sync_write, | |
2637 | .mmap = ocfs2_mmap, | |
2638 | .fsync = ocfs2_sync_file, | |
2639 | .release = ocfs2_file_release, | |
2640 | .open = ocfs2_file_open, | |
2641 | .aio_read = ocfs2_file_aio_read, | |
2642 | .aio_write = ocfs2_file_aio_write, | |
2643 | .unlocked_ioctl = ocfs2_ioctl, | |
2644 | #ifdef CONFIG_COMPAT | |
2645 | .compat_ioctl = ocfs2_compat_ioctl, | |
2646 | #endif | |
2647 | .flock = ocfs2_flock, | |
2648 | .splice_read = ocfs2_file_splice_read, | |
2649 | .splice_write = ocfs2_file_splice_write, | |
2650 | }; | |
2651 | ||
2652 | const struct file_operations ocfs2_dops_no_plocks = { | |
2653 | .llseek = generic_file_llseek, | |
2654 | .read = generic_read_dir, | |
2655 | .readdir = ocfs2_readdir, | |
2656 | .fsync = ocfs2_sync_file, | |
2657 | .release = ocfs2_dir_release, | |
2658 | .open = ocfs2_dir_open, | |
2659 | .unlocked_ioctl = ocfs2_ioctl, | |
2660 | #ifdef CONFIG_COMPAT | |
2661 | .compat_ioctl = ocfs2_compat_ioctl, | |
2662 | #endif | |
2663 | .flock = ocfs2_flock, | |
2664 | }; |