1
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6
7#include <linux/slab.h>
8#include <linux/spinlock.h>
9#include <linux/completion.h>
10#include <linux/buffer_head.h>
11#include <linux/pagemap.h>
12#include <linux/uio.h>
13#include <linux/blkdev.h>
14#include <linux/mm.h>
15#include <linux/mount.h>
16#include <linux/fs.h>
17#include <linux/gfs2_ondisk.h>
18#include <linux/falloc.h>
19#include <linux/swap.h>
20#include <linux/crc32.h>
21#include <linux/writeback.h>
22#include <linux/uaccess.h>
23#include <linux/dlm.h>
24#include <linux/dlm_plock.h>
25#include <linux/delay.h>
26#include <linux/backing-dev.h>
27
28#include "gfs2.h"
29#include "incore.h"
30#include "bmap.h"
31#include "aops.h"
32#include "dir.h"
33#include "glock.h"
34#include "glops.h"
35#include "inode.h"
36#include "log.h"
37#include "meta_io.h"
38#include "quota.h"
39#include "rgrp.h"
40#include "trans.h"
41#include "util.h"
42
43
44
45
46
47
48
49
50
51
52
53
54
55static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence)
56{
57 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
58 struct gfs2_holder i_gh;
59 loff_t error;
60
61 switch (whence) {
62 case SEEK_END:
63 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
64 &i_gh);
65 if (!error) {
66 error = generic_file_llseek(file, offset, whence);
67 gfs2_glock_dq_uninit(&i_gh);
68 }
69 break;
70
71 case SEEK_DATA:
72 error = gfs2_seek_data(file, offset);
73 break;
74
75 case SEEK_HOLE:
76 error = gfs2_seek_hole(file, offset);
77 break;
78
79 case SEEK_CUR:
80 case SEEK_SET:
81
82
83
84
85 error = generic_file_llseek(file, offset, whence);
86 break;
87 default:
88 error = -EINVAL;
89 }
90
91 return error;
92}
93
94
95
96
97
98
99
100
101
102static int gfs2_readdir(struct file *file, struct dir_context *ctx)
103{
104 struct inode *dir = file->f_mapping->host;
105 struct gfs2_inode *dip = GFS2_I(dir);
106 struct gfs2_holder d_gh;
107 int error;
108
109 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
110 if (error)
111 return error;
112
113 error = gfs2_dir_read(dir, ctx, &file->f_ra);
114
115 gfs2_glock_dq_uninit(&d_gh);
116
117 return error;
118}
119
120
121
122
123
124
125
126static struct {
127 u32 fsflag;
128 u32 gfsflag;
129} fsflag_gfs2flag[] = {
130 {FS_SYNC_FL, GFS2_DIF_SYNC},
131 {FS_IMMUTABLE_FL, GFS2_DIF_IMMUTABLE},
132 {FS_APPEND_FL, GFS2_DIF_APPENDONLY},
133 {FS_NOATIME_FL, GFS2_DIF_NOATIME},
134 {FS_INDEX_FL, GFS2_DIF_EXHASH},
135 {FS_TOPDIR_FL, GFS2_DIF_TOPDIR},
136 {FS_JOURNAL_DATA_FL, GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA},
137};
138
139static inline u32 gfs2_gfsflags_to_fsflags(struct inode *inode, u32 gfsflags)
140{
141 int i;
142 u32 fsflags = 0;
143
144 if (S_ISDIR(inode->i_mode))
145 gfsflags &= ~GFS2_DIF_JDATA;
146 else
147 gfsflags &= ~GFS2_DIF_INHERIT_JDATA;
148
149 for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++)
150 if (gfsflags & fsflag_gfs2flag[i].gfsflag)
151 fsflags |= fsflag_gfs2flag[i].fsflag;
152 return fsflags;
153}
154
155static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
156{
157 struct inode *inode = file_inode(filp);
158 struct gfs2_inode *ip = GFS2_I(inode);
159 struct gfs2_holder gh;
160 int error;
161 u32 fsflags;
162
163 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
164 error = gfs2_glock_nq(&gh);
165 if (error)
166 goto out_uninit;
167
168 fsflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags);
169
170 if (put_user(fsflags, ptr))
171 error = -EFAULT;
172
173 gfs2_glock_dq(&gh);
174out_uninit:
175 gfs2_holder_uninit(&gh);
176 return error;
177}
178
179void gfs2_set_inode_flags(struct inode *inode)
180{
181 struct gfs2_inode *ip = GFS2_I(inode);
182 unsigned int flags = inode->i_flags;
183
184 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC);
185 if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode))
186 flags |= S_NOSEC;
187 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
188 flags |= S_IMMUTABLE;
189 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
190 flags |= S_APPEND;
191 if (ip->i_diskflags & GFS2_DIF_NOATIME)
192 flags |= S_NOATIME;
193 if (ip->i_diskflags & GFS2_DIF_SYNC)
194 flags |= S_SYNC;
195 inode->i_flags = flags;
196}
197
198
199#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
200 GFS2_DIF_IMMUTABLE| \
201 GFS2_DIF_APPENDONLY| \
202 GFS2_DIF_NOATIME| \
203 GFS2_DIF_SYNC| \
204 GFS2_DIF_TOPDIR| \
205 GFS2_DIF_INHERIT_JDATA)
206
207
208
209
210
211
212
213
214
215static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask,
216 const u32 fsflags)
217{
218 struct inode *inode = file_inode(filp);
219 struct gfs2_inode *ip = GFS2_I(inode);
220 struct gfs2_sbd *sdp = GFS2_SB(inode);
221 struct buffer_head *bh;
222 struct gfs2_holder gh;
223 int error;
224 u32 new_flags, flags, oldflags;
225
226 error = mnt_want_write_file(filp);
227 if (error)
228 return error;
229
230 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
231 if (error)
232 goto out_drop_write;
233
234 oldflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags);
235 error = vfs_ioc_setflags_prepare(inode, oldflags, fsflags);
236 if (error)
237 goto out;
238
239 error = -EACCES;
240 if (!inode_owner_or_capable(inode))
241 goto out;
242
243 error = 0;
244 flags = ip->i_diskflags;
245 new_flags = (flags & ~mask) | (reqflags & mask);
246 if ((new_flags ^ flags) == 0)
247 goto out;
248
249 error = -EPERM;
250 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
251 goto out;
252 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
253 goto out;
254 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
255 !capable(CAP_LINUX_IMMUTABLE))
256 goto out;
257 if (!IS_IMMUTABLE(inode)) {
258 error = gfs2_permission(inode, MAY_WRITE);
259 if (error)
260 goto out;
261 }
262 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
263 if (new_flags & GFS2_DIF_JDATA)
264 gfs2_log_flush(sdp, ip->i_gl,
265 GFS2_LOG_HEAD_FLUSH_NORMAL |
266 GFS2_LFC_SET_FLAGS);
267 error = filemap_fdatawrite(inode->i_mapping);
268 if (error)
269 goto out;
270 error = filemap_fdatawait(inode->i_mapping);
271 if (error)
272 goto out;
273 if (new_flags & GFS2_DIF_JDATA)
274 gfs2_ordered_del_inode(ip);
275 }
276 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
277 if (error)
278 goto out;
279 error = gfs2_meta_inode_buffer(ip, &bh);
280 if (error)
281 goto out_trans_end;
282 inode->i_ctime = current_time(inode);
283 gfs2_trans_add_meta(ip->i_gl, bh);
284 ip->i_diskflags = new_flags;
285 gfs2_dinode_out(ip, bh->b_data);
286 brelse(bh);
287 gfs2_set_inode_flags(inode);
288 gfs2_set_aops(inode);
289out_trans_end:
290 gfs2_trans_end(sdp);
291out:
292 gfs2_glock_dq_uninit(&gh);
293out_drop_write:
294 mnt_drop_write_file(filp);
295 return error;
296}
297
298static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
299{
300 struct inode *inode = file_inode(filp);
301 u32 fsflags, gfsflags = 0;
302 u32 mask;
303 int i;
304
305 if (get_user(fsflags, ptr))
306 return -EFAULT;
307
308 for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) {
309 if (fsflags & fsflag_gfs2flag[i].fsflag) {
310 fsflags &= ~fsflag_gfs2flag[i].fsflag;
311 gfsflags |= fsflag_gfs2flag[i].gfsflag;
312 }
313 }
314 if (fsflags || gfsflags & ~GFS2_FLAGS_USER_SET)
315 return -EINVAL;
316
317 mask = GFS2_FLAGS_USER_SET;
318 if (S_ISDIR(inode->i_mode)) {
319 mask &= ~GFS2_DIF_JDATA;
320 } else {
321
322 if (gfsflags & GFS2_DIF_TOPDIR)
323 return -EINVAL;
324 mask &= ~(GFS2_DIF_TOPDIR | GFS2_DIF_INHERIT_JDATA);
325 }
326
327 return do_gfs2_set_flags(filp, gfsflags, mask, fsflags);
328}
329
330static int gfs2_getlabel(struct file *filp, char __user *label)
331{
332 struct inode *inode = file_inode(filp);
333 struct gfs2_sbd *sdp = GFS2_SB(inode);
334
335 if (copy_to_user(label, sdp->sd_sb.sb_locktable, GFS2_LOCKNAME_LEN))
336 return -EFAULT;
337
338 return 0;
339}
340
341static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
342{
343 switch(cmd) {
344 case FS_IOC_GETFLAGS:
345 return gfs2_get_flags(filp, (u32 __user *)arg);
346 case FS_IOC_SETFLAGS:
347 return gfs2_set_flags(filp, (u32 __user *)arg);
348 case FITRIM:
349 return gfs2_fitrim(filp, (void __user *)arg);
350 case FS_IOC_GETFSLABEL:
351 return gfs2_getlabel(filp, (char __user *)arg);
352 }
353
354 return -ENOTTY;
355}
356
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358
359
360
361
362
363
364
365
366
367
368
369static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size)
370{
371 struct inode *inode = file_inode(filep);
372 struct gfs2_sbd *sdp = GFS2_SB(inode);
373 struct gfs2_inode *ip = GFS2_I(inode);
374 size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift;
375 int hint = min_t(size_t, INT_MAX, blks);
376
377 if (hint > atomic_read(&ip->i_sizehint))
378 atomic_set(&ip->i_sizehint, hint);
379}
380
381
382
383
384
385
386
387
388
389
390static int gfs2_allocate_page_backing(struct page *page)
391{
392 u64 pos = page_offset(page);
393 u64 size = PAGE_SIZE;
394
395 do {
396 struct iomap iomap = { };
397
398 if (gfs2_iomap_get_alloc(page->mapping->host, pos, 1, &iomap))
399 return -EIO;
400
401 iomap.length = min(iomap.length, size);
402 size -= iomap.length;
403 pos += iomap.length;
404 } while (size > 0);
405
406 return 0;
407}
408
409
410
411
412
413
414
415
416
417
418static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
419{
420 struct page *page = vmf->page;
421 struct inode *inode = file_inode(vmf->vma->vm_file);
422 struct gfs2_inode *ip = GFS2_I(inode);
423 struct gfs2_sbd *sdp = GFS2_SB(inode);
424 struct gfs2_alloc_parms ap = { .aflags = 0, };
425 unsigned long last_index;
426 u64 pos = page_offset(page);
427 unsigned int data_blocks, ind_blocks, rblocks;
428 struct gfs2_holder gh;
429 loff_t size;
430 int ret;
431
432 sb_start_pagefault(inode->i_sb);
433
434 ret = gfs2_rsqa_alloc(ip);
435 if (ret)
436 goto out;
437
438 gfs2_size_hint(vmf->vma->vm_file, pos, PAGE_SIZE);
439
440 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
441 ret = gfs2_glock_nq(&gh);
442 if (ret)
443 goto out_uninit;
444
445
446 file_update_time(vmf->vma->vm_file);
447
448 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
449 set_bit(GIF_SW_PAGED, &ip->i_flags);
450
451 if (!gfs2_write_alloc_required(ip, pos, PAGE_SIZE)) {
452 lock_page(page);
453 if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
454 ret = -EAGAIN;
455 unlock_page(page);
456 }
457 goto out_unlock;
458 }
459
460 ret = gfs2_rindex_update(sdp);
461 if (ret)
462 goto out_unlock;
463
464 gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
465 ap.target = data_blocks + ind_blocks;
466 ret = gfs2_quota_lock_check(ip, &ap);
467 if (ret)
468 goto out_unlock;
469 ret = gfs2_inplace_reserve(ip, &ap);
470 if (ret)
471 goto out_quota_unlock;
472
473 rblocks = RES_DINODE + ind_blocks;
474 if (gfs2_is_jdata(ip))
475 rblocks += data_blocks ? data_blocks : 1;
476 if (ind_blocks || data_blocks) {
477 rblocks += RES_STATFS + RES_QUOTA;
478 rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
479 }
480 ret = gfs2_trans_begin(sdp, rblocks, 0);
481 if (ret)
482 goto out_trans_fail;
483
484 lock_page(page);
485 ret = -EINVAL;
486 size = i_size_read(inode);
487 last_index = (size - 1) >> PAGE_SHIFT;
488
489 if (size == 0 || (page->index > last_index))
490 goto out_trans_end;
491
492 ret = -EAGAIN;
493
494
495
496 if (!PageUptodate(page) || page->mapping != inode->i_mapping)
497 goto out_trans_end;
498
499
500 ret = 0;
501 if (gfs2_is_stuffed(ip))
502 ret = gfs2_unstuff_dinode(ip, page);
503 if (ret == 0)
504 ret = gfs2_allocate_page_backing(page);
505
506out_trans_end:
507 if (ret)
508 unlock_page(page);
509 gfs2_trans_end(sdp);
510out_trans_fail:
511 gfs2_inplace_release(ip);
512out_quota_unlock:
513 gfs2_quota_unlock(ip);
514out_unlock:
515 gfs2_glock_dq(&gh);
516out_uninit:
517 gfs2_holder_uninit(&gh);
518 if (ret == 0) {
519 set_page_dirty(page);
520 wait_for_stable_page(page);
521 }
522out:
523 sb_end_pagefault(inode->i_sb);
524 return block_page_mkwrite_return(ret);
525}
526
527static const struct vm_operations_struct gfs2_vm_ops = {
528 .fault = filemap_fault,
529 .map_pages = filemap_map_pages,
530 .page_mkwrite = gfs2_page_mkwrite,
531};
532
533
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535
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537
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541
542
543
544
545static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
546{
547 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
548
549 if (!(file->f_flags & O_NOATIME) &&
550 !IS_NOATIME(&ip->i_inode)) {
551 struct gfs2_holder i_gh;
552 int error;
553
554 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
555 &i_gh);
556 if (error)
557 return error;
558
559 gfs2_glock_dq_uninit(&i_gh);
560 file_accessed(file);
561 }
562 vma->vm_ops = &gfs2_vm_ops;
563
564 return 0;
565}
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580int gfs2_open_common(struct inode *inode, struct file *file)
581{
582 struct gfs2_file *fp;
583 int ret;
584
585 if (S_ISREG(inode->i_mode)) {
586 ret = generic_file_open(inode, file);
587 if (ret)
588 return ret;
589 }
590
591 fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS);
592 if (!fp)
593 return -ENOMEM;
594
595 mutex_init(&fp->f_fl_mutex);
596
597 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
598 file->private_data = fp;
599 return 0;
600}
601
602
603
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605
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609
610
611
612
613
614
615
616static int gfs2_open(struct inode *inode, struct file *file)
617{
618 struct gfs2_inode *ip = GFS2_I(inode);
619 struct gfs2_holder i_gh;
620 int error;
621 bool need_unlock = false;
622
623 if (S_ISREG(ip->i_inode.i_mode)) {
624 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
625 &i_gh);
626 if (error)
627 return error;
628 need_unlock = true;
629 }
630
631 error = gfs2_open_common(inode, file);
632
633 if (need_unlock)
634 gfs2_glock_dq_uninit(&i_gh);
635
636 return error;
637}
638
639
640
641
642
643
644
645
646
647static int gfs2_release(struct inode *inode, struct file *file)
648{
649 struct gfs2_inode *ip = GFS2_I(inode);
650
651 kfree(file->private_data);
652 file->private_data = NULL;
653
654 if (!(file->f_mode & FMODE_WRITE))
655 return 0;
656
657 gfs2_rsqa_delete(ip, &inode->i_writecount);
658 return 0;
659}
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
683 int datasync)
684{
685 struct address_space *mapping = file->f_mapping;
686 struct inode *inode = mapping->host;
687 int sync_state = inode->i_state & I_DIRTY_ALL;
688 struct gfs2_inode *ip = GFS2_I(inode);
689 int ret = 0, ret1 = 0;
690
691 if (mapping->nrpages) {
692 ret1 = filemap_fdatawrite_range(mapping, start, end);
693 if (ret1 == -EIO)
694 return ret1;
695 }
696
697 if (!gfs2_is_jdata(ip))
698 sync_state &= ~I_DIRTY_PAGES;
699 if (datasync)
700 sync_state &= ~(I_DIRTY_SYNC | I_DIRTY_TIME);
701
702 if (sync_state) {
703 ret = sync_inode_metadata(inode, 1);
704 if (ret)
705 return ret;
706 if (gfs2_is_jdata(ip))
707 ret = file_write_and_wait(file);
708 if (ret)
709 return ret;
710 gfs2_ail_flush(ip->i_gl, 1);
711 }
712
713 if (mapping->nrpages)
714 ret = file_fdatawait_range(file, start, end);
715
716 return ret ? ret : ret1;
717}
718
719static ssize_t gfs2_file_direct_read(struct kiocb *iocb, struct iov_iter *to)
720{
721 struct file *file = iocb->ki_filp;
722 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
723 size_t count = iov_iter_count(to);
724 struct gfs2_holder gh;
725 ssize_t ret;
726
727 if (!count)
728 return 0;
729
730 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
731 ret = gfs2_glock_nq(&gh);
732 if (ret)
733 goto out_uninit;
734
735 ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL);
736
737 gfs2_glock_dq(&gh);
738out_uninit:
739 gfs2_holder_uninit(&gh);
740 return ret;
741}
742
743static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
744{
745 struct file *file = iocb->ki_filp;
746 struct inode *inode = file->f_mapping->host;
747 struct gfs2_inode *ip = GFS2_I(inode);
748 size_t len = iov_iter_count(from);
749 loff_t offset = iocb->ki_pos;
750 struct gfs2_holder gh;
751 ssize_t ret;
752
753
754
755
756
757
758
759
760
761 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
762 ret = gfs2_glock_nq(&gh);
763 if (ret)
764 goto out_uninit;
765
766
767 if (offset + len > i_size_read(&ip->i_inode))
768 goto out;
769
770 ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL);
771
772out:
773 gfs2_glock_dq(&gh);
774out_uninit:
775 gfs2_holder_uninit(&gh);
776 return ret;
777}
778
779static ssize_t gfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
780{
781 ssize_t ret;
782
783 if (iocb->ki_flags & IOCB_DIRECT) {
784 ret = gfs2_file_direct_read(iocb, to);
785 if (likely(ret != -ENOTBLK))
786 return ret;
787 iocb->ki_flags &= ~IOCB_DIRECT;
788 }
789 return generic_file_read_iter(iocb, to);
790}
791
792
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799
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801
802
803
804static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
805{
806 struct file *file = iocb->ki_filp;
807 struct inode *inode = file_inode(file);
808 struct gfs2_inode *ip = GFS2_I(inode);
809 ssize_t written = 0, ret;
810
811 ret = gfs2_rsqa_alloc(ip);
812 if (ret)
813 return ret;
814
815 gfs2_size_hint(file, iocb->ki_pos, iov_iter_count(from));
816
817 if (iocb->ki_flags & IOCB_APPEND) {
818 struct gfs2_holder gh;
819
820 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
821 if (ret)
822 return ret;
823 gfs2_glock_dq_uninit(&gh);
824 }
825
826 inode_lock(inode);
827 ret = generic_write_checks(iocb, from);
828 if (ret <= 0)
829 goto out;
830
831
832 current->backing_dev_info = inode_to_bdi(inode);
833
834 ret = file_remove_privs(file);
835 if (ret)
836 goto out2;
837
838 ret = file_update_time(file);
839 if (ret)
840 goto out2;
841
842 if (iocb->ki_flags & IOCB_DIRECT) {
843 struct address_space *mapping = file->f_mapping;
844 loff_t pos, endbyte;
845 ssize_t buffered;
846
847 written = gfs2_file_direct_write(iocb, from);
848 if (written < 0 || !iov_iter_count(from))
849 goto out2;
850
851 ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
852 if (unlikely(ret < 0))
853 goto out2;
854 buffered = ret;
855
856
857
858
859
860
861 pos = iocb->ki_pos;
862 endbyte = pos + buffered - 1;
863 ret = filemap_write_and_wait_range(mapping, pos, endbyte);
864 if (!ret) {
865 iocb->ki_pos += buffered;
866 written += buffered;
867 invalidate_mapping_pages(mapping,
868 pos >> PAGE_SHIFT,
869 endbyte >> PAGE_SHIFT);
870 } else {
871
872
873
874
875 }
876 } else {
877 ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
878 if (likely(ret > 0))
879 iocb->ki_pos += ret;
880 }
881
882out2:
883 current->backing_dev_info = NULL;
884out:
885 inode_unlock(inode);
886 if (likely(ret > 0)) {
887
888 ret = generic_write_sync(iocb, ret);
889 }
890 return written ? written : ret;
891}
892
893static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
894 int mode)
895{
896 struct super_block *sb = inode->i_sb;
897 struct gfs2_inode *ip = GFS2_I(inode);
898 loff_t end = offset + len;
899 struct buffer_head *dibh;
900 int error;
901
902 error = gfs2_meta_inode_buffer(ip, &dibh);
903 if (unlikely(error))
904 return error;
905
906 gfs2_trans_add_meta(ip->i_gl, dibh);
907
908 if (gfs2_is_stuffed(ip)) {
909 error = gfs2_unstuff_dinode(ip, NULL);
910 if (unlikely(error))
911 goto out;
912 }
913
914 while (offset < end) {
915 struct iomap iomap = { };
916
917 error = gfs2_iomap_get_alloc(inode, offset, end - offset,
918 &iomap);
919 if (error)
920 goto out;
921 offset = iomap.offset + iomap.length;
922 if (!(iomap.flags & IOMAP_F_NEW))
923 continue;
924 error = sb_issue_zeroout(sb, iomap.addr >> inode->i_blkbits,
925 iomap.length >> inode->i_blkbits,
926 GFP_NOFS);
927 if (error) {
928 fs_err(GFS2_SB(inode), "Failed to zero data buffers\n");
929 goto out;
930 }
931 }
932out:
933 brelse(dibh);
934 return error;
935}
936
937
938
939
940
941
942
943
944
945
946
947static void calc_max_reserv(struct gfs2_inode *ip, loff_t *len,
948 unsigned int *data_blocks, unsigned int *ind_blocks,
949 unsigned int max_blocks)
950{
951 loff_t max = *len;
952 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
953 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
954
955 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
956 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
957 max_data -= tmp;
958 }
959
960 *data_blocks = max_data;
961 *ind_blocks = max_blocks - max_data;
962 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
963 if (*len > max) {
964 *len = max;
965 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
966 }
967}
968
969static long __gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
970{
971 struct inode *inode = file_inode(file);
972 struct gfs2_sbd *sdp = GFS2_SB(inode);
973 struct gfs2_inode *ip = GFS2_I(inode);
974 struct gfs2_alloc_parms ap = { .aflags = 0, };
975 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
976 loff_t bytes, max_bytes, max_blks;
977 int error;
978 const loff_t pos = offset;
979 const loff_t count = len;
980 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
981 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
982 loff_t max_chunk_size = UINT_MAX & bsize_mask;
983
984 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
985
986 offset &= bsize_mask;
987
988 len = next - offset;
989 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
990 if (!bytes)
991 bytes = UINT_MAX;
992 bytes &= bsize_mask;
993 if (bytes == 0)
994 bytes = sdp->sd_sb.sb_bsize;
995
996 gfs2_size_hint(file, offset, len);
997
998 gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
999 ap.min_target = data_blocks + ind_blocks;
1000
1001 while (len > 0) {
1002 if (len < bytes)
1003 bytes = len;
1004 if (!gfs2_write_alloc_required(ip, offset, bytes)) {
1005 len -= bytes;
1006 offset += bytes;
1007 continue;
1008 }
1009
1010
1011
1012
1013
1014 max_bytes = (len > max_chunk_size) ? max_chunk_size : len;
1015
1016
1017
1018
1019
1020 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
1021 ap.target = data_blocks + ind_blocks;
1022
1023 error = gfs2_quota_lock_check(ip, &ap);
1024 if (error)
1025 return error;
1026
1027
1028 max_blks = UINT_MAX;
1029 if (ap.allowed)
1030 max_blks = ap.allowed;
1031
1032 error = gfs2_inplace_reserve(ip, &ap);
1033 if (error)
1034 goto out_qunlock;
1035
1036
1037 if (ap.allowed && ap.allowed < max_blks)
1038 max_blks = ap.allowed;
1039
1040
1041
1042
1043 calc_max_reserv(ip, &max_bytes, &data_blocks,
1044 &ind_blocks, max_blks);
1045
1046 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
1047 RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks);
1048 if (gfs2_is_jdata(ip))
1049 rblocks += data_blocks ? data_blocks : 1;
1050
1051 error = gfs2_trans_begin(sdp, rblocks,
1052 PAGE_SIZE/sdp->sd_sb.sb_bsize);
1053 if (error)
1054 goto out_trans_fail;
1055
1056 error = fallocate_chunk(inode, offset, max_bytes, mode);
1057 gfs2_trans_end(sdp);
1058
1059 if (error)
1060 goto out_trans_fail;
1061
1062 len -= max_bytes;
1063 offset += max_bytes;
1064 gfs2_inplace_release(ip);
1065 gfs2_quota_unlock(ip);
1066 }
1067
1068 if (!(mode & FALLOC_FL_KEEP_SIZE) && (pos + count) > inode->i_size) {
1069 i_size_write(inode, pos + count);
1070 file_update_time(file);
1071 mark_inode_dirty(inode);
1072 }
1073
1074 if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host))
1075 return vfs_fsync_range(file, pos, pos + count - 1,
1076 (file->f_flags & __O_SYNC) ? 0 : 1);
1077 return 0;
1078
1079out_trans_fail:
1080 gfs2_inplace_release(ip);
1081out_qunlock:
1082 gfs2_quota_unlock(ip);
1083 return error;
1084}
1085
1086static long gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
1087{
1088 struct inode *inode = file_inode(file);
1089 struct gfs2_sbd *sdp = GFS2_SB(inode);
1090 struct gfs2_inode *ip = GFS2_I(inode);
1091 struct gfs2_holder gh;
1092 int ret;
1093
1094 if (mode & ~(FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE))
1095 return -EOPNOTSUPP;
1096
1097 if (gfs2_is_jdata(ip) && inode != sdp->sd_rindex)
1098 return -EOPNOTSUPP;
1099
1100 inode_lock(inode);
1101
1102 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1103 ret = gfs2_glock_nq(&gh);
1104 if (ret)
1105 goto out_uninit;
1106
1107 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
1108 (offset + len) > inode->i_size) {
1109 ret = inode_newsize_ok(inode, offset + len);
1110 if (ret)
1111 goto out_unlock;
1112 }
1113
1114 ret = get_write_access(inode);
1115 if (ret)
1116 goto out_unlock;
1117
1118 if (mode & FALLOC_FL_PUNCH_HOLE) {
1119 ret = __gfs2_punch_hole(file, offset, len);
1120 } else {
1121 ret = gfs2_rsqa_alloc(ip);
1122 if (ret)
1123 goto out_putw;
1124
1125 ret = __gfs2_fallocate(file, mode, offset, len);
1126
1127 if (ret)
1128 gfs2_rs_deltree(&ip->i_res);
1129 }
1130
1131out_putw:
1132 put_write_access(inode);
1133out_unlock:
1134 gfs2_glock_dq(&gh);
1135out_uninit:
1136 gfs2_holder_uninit(&gh);
1137 inode_unlock(inode);
1138 return ret;
1139}
1140
1141static ssize_t gfs2_file_splice_write(struct pipe_inode_info *pipe,
1142 struct file *out, loff_t *ppos,
1143 size_t len, unsigned int flags)
1144{
1145 int error;
1146 struct gfs2_inode *ip = GFS2_I(out->f_mapping->host);
1147
1148 error = gfs2_rsqa_alloc(ip);
1149 if (error)
1150 return (ssize_t)error;
1151
1152 gfs2_size_hint(out, *ppos, len);
1153
1154 return iter_file_splice_write(pipe, out, ppos, len, flags);
1155}
1156
1157#ifdef CONFIG_GFS2_FS_LOCKING_DLM
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
1169{
1170 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
1171 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
1172 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1173
1174 if (!(fl->fl_flags & FL_POSIX))
1175 return -ENOLCK;
1176 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
1177 return -ENOLCK;
1178
1179 if (cmd == F_CANCELLK) {
1180
1181 cmd = F_SETLK;
1182 fl->fl_type = F_UNLCK;
1183 }
1184 if (unlikely(test_bit(SDF_WITHDRAWN, &sdp->sd_flags))) {
1185 if (fl->fl_type == F_UNLCK)
1186 locks_lock_file_wait(file, fl);
1187 return -EIO;
1188 }
1189 if (IS_GETLK(cmd))
1190 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
1191 else if (fl->fl_type == F_UNLCK)
1192 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
1193 else
1194 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
1195}
1196
1197static int do_flock(struct file *file, int cmd, struct file_lock *fl)
1198{
1199 struct gfs2_file *fp = file->private_data;
1200 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1201 struct gfs2_inode *ip = GFS2_I(file_inode(file));
1202 struct gfs2_glock *gl;
1203 unsigned int state;
1204 u16 flags;
1205 int error = 0;
1206 int sleeptime;
1207
1208 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
1209 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY_1CB) | GL_EXACT;
1210
1211 mutex_lock(&fp->f_fl_mutex);
1212
1213 if (gfs2_holder_initialized(fl_gh)) {
1214 struct file_lock request;
1215 if (fl_gh->gh_state == state)
1216 goto out;
1217 locks_init_lock(&request);
1218 request.fl_type = F_UNLCK;
1219 request.fl_flags = FL_FLOCK;
1220 locks_lock_file_wait(file, &request);
1221 gfs2_glock_dq(fl_gh);
1222 gfs2_holder_reinit(state, flags, fl_gh);
1223 } else {
1224 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
1225 &gfs2_flock_glops, CREATE, &gl);
1226 if (error)
1227 goto out;
1228 gfs2_holder_init(gl, state, flags, fl_gh);
1229 gfs2_glock_put(gl);
1230 }
1231 for (sleeptime = 1; sleeptime <= 4; sleeptime <<= 1) {
1232 error = gfs2_glock_nq(fl_gh);
1233 if (error != GLR_TRYFAILED)
1234 break;
1235 fl_gh->gh_flags = LM_FLAG_TRY | GL_EXACT;
1236 fl_gh->gh_error = 0;
1237 msleep(sleeptime);
1238 }
1239 if (error) {
1240 gfs2_holder_uninit(fl_gh);
1241 if (error == GLR_TRYFAILED)
1242 error = -EAGAIN;
1243 } else {
1244 error = locks_lock_file_wait(file, fl);
1245 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1246 }
1247
1248out:
1249 mutex_unlock(&fp->f_fl_mutex);
1250 return error;
1251}
1252
1253static void do_unflock(struct file *file, struct file_lock *fl)
1254{
1255 struct gfs2_file *fp = file->private_data;
1256 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1257
1258 mutex_lock(&fp->f_fl_mutex);
1259 locks_lock_file_wait(file, fl);
1260 if (gfs2_holder_initialized(fl_gh)) {
1261 gfs2_glock_dq(fl_gh);
1262 gfs2_holder_uninit(fl_gh);
1263 }
1264 mutex_unlock(&fp->f_fl_mutex);
1265}
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
1277{
1278 if (!(fl->fl_flags & FL_FLOCK))
1279 return -ENOLCK;
1280 if (fl->fl_type & LOCK_MAND)
1281 return -EOPNOTSUPP;
1282
1283 if (fl->fl_type == F_UNLCK) {
1284 do_unflock(file, fl);
1285 return 0;
1286 } else {
1287 return do_flock(file, cmd, fl);
1288 }
1289}
1290
1291const struct file_operations gfs2_file_fops = {
1292 .llseek = gfs2_llseek,
1293 .read_iter = gfs2_file_read_iter,
1294 .write_iter = gfs2_file_write_iter,
1295 .iopoll = iomap_dio_iopoll,
1296 .unlocked_ioctl = gfs2_ioctl,
1297 .mmap = gfs2_mmap,
1298 .open = gfs2_open,
1299 .release = gfs2_release,
1300 .fsync = gfs2_fsync,
1301 .lock = gfs2_lock,
1302 .flock = gfs2_flock,
1303 .splice_read = generic_file_splice_read,
1304 .splice_write = gfs2_file_splice_write,
1305 .setlease = simple_nosetlease,
1306 .fallocate = gfs2_fallocate,
1307};
1308
1309const struct file_operations gfs2_dir_fops = {
1310 .iterate_shared = gfs2_readdir,
1311 .unlocked_ioctl = gfs2_ioctl,
1312 .open = gfs2_open,
1313 .release = gfs2_release,
1314 .fsync = gfs2_fsync,
1315 .lock = gfs2_lock,
1316 .flock = gfs2_flock,
1317 .llseek = default_llseek,
1318};
1319
1320#endif
1321
1322const struct file_operations gfs2_file_fops_nolock = {
1323 .llseek = gfs2_llseek,
1324 .read_iter = gfs2_file_read_iter,
1325 .write_iter = gfs2_file_write_iter,
1326 .iopoll = iomap_dio_iopoll,
1327 .unlocked_ioctl = gfs2_ioctl,
1328 .mmap = gfs2_mmap,
1329 .open = gfs2_open,
1330 .release = gfs2_release,
1331 .fsync = gfs2_fsync,
1332 .splice_read = generic_file_splice_read,
1333 .splice_write = gfs2_file_splice_write,
1334 .setlease = generic_setlease,
1335 .fallocate = gfs2_fallocate,
1336};
1337
1338const struct file_operations gfs2_dir_fops_nolock = {
1339 .iterate_shared = gfs2_readdir,
1340 .unlocked_ioctl = gfs2_ioctl,
1341 .open = gfs2_open,
1342 .release = gfs2_release,
1343 .fsync = gfs2_fsync,
1344 .llseek = default_llseek,
1345};
1346
1347