1
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5
6
7#include <linux/slab.h>
8#include <linux/spinlock.h>
9#include <linux/compat.h>
10#include <linux/completion.h>
11#include <linux/buffer_head.h>
12#include <linux/pagemap.h>
13#include <linux/uio.h>
14#include <linux/blkdev.h>
15#include <linux/mm.h>
16#include <linux/mount.h>
17#include <linux/fs.h>
18#include <linux/gfs2_ondisk.h>
19#include <linux/falloc.h>
20#include <linux/swap.h>
21#include <linux/crc32.h>
22#include <linux/writeback.h>
23#include <linux/uaccess.h>
24#include <linux/dlm.h>
25#include <linux/dlm_plock.h>
26#include <linux/delay.h>
27#include <linux/backing-dev.h>
28
29#include "gfs2.h"
30#include "incore.h"
31#include "bmap.h"
32#include "aops.h"
33#include "dir.h"
34#include "glock.h"
35#include "glops.h"
36#include "inode.h"
37#include "log.h"
38#include "meta_io.h"
39#include "quota.h"
40#include "rgrp.h"
41#include "trans.h"
42#include "util.h"
43
44
45
46
47
48
49
50
51
52
53
54
55
56static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence)
57{
58 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
59 struct gfs2_holder i_gh;
60 loff_t error;
61
62 switch (whence) {
63 case SEEK_END:
64 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
65 &i_gh);
66 if (!error) {
67 error = generic_file_llseek(file, offset, whence);
68 gfs2_glock_dq_uninit(&i_gh);
69 }
70 break;
71
72 case SEEK_DATA:
73 error = gfs2_seek_data(file, offset);
74 break;
75
76 case SEEK_HOLE:
77 error = gfs2_seek_hole(file, offset);
78 break;
79
80 case SEEK_CUR:
81 case SEEK_SET:
82
83
84
85
86 error = generic_file_llseek(file, offset, whence);
87 break;
88 default:
89 error = -EINVAL;
90 }
91
92 return error;
93}
94
95
96
97
98
99
100
101
102
103static int gfs2_readdir(struct file *file, struct dir_context *ctx)
104{
105 struct inode *dir = file->f_mapping->host;
106 struct gfs2_inode *dip = GFS2_I(dir);
107 struct gfs2_holder d_gh;
108 int error;
109
110 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
111 if (error)
112 return error;
113
114 error = gfs2_dir_read(dir, ctx, &file->f_ra);
115
116 gfs2_glock_dq_uninit(&d_gh);
117
118 return error;
119}
120
121
122
123
124
125
126
127static struct {
128 u32 fsflag;
129 u32 gfsflag;
130} fsflag_gfs2flag[] = {
131 {FS_SYNC_FL, GFS2_DIF_SYNC},
132 {FS_IMMUTABLE_FL, GFS2_DIF_IMMUTABLE},
133 {FS_APPEND_FL, GFS2_DIF_APPENDONLY},
134 {FS_NOATIME_FL, GFS2_DIF_NOATIME},
135 {FS_INDEX_FL, GFS2_DIF_EXHASH},
136 {FS_TOPDIR_FL, GFS2_DIF_TOPDIR},
137 {FS_JOURNAL_DATA_FL, GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA},
138};
139
140static inline u32 gfs2_gfsflags_to_fsflags(struct inode *inode, u32 gfsflags)
141{
142 int i;
143 u32 fsflags = 0;
144
145 if (S_ISDIR(inode->i_mode))
146 gfsflags &= ~GFS2_DIF_JDATA;
147 else
148 gfsflags &= ~GFS2_DIF_INHERIT_JDATA;
149
150 for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++)
151 if (gfsflags & fsflag_gfs2flag[i].gfsflag)
152 fsflags |= fsflag_gfs2flag[i].fsflag;
153 return fsflags;
154}
155
156static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
157{
158 struct inode *inode = file_inode(filp);
159 struct gfs2_inode *ip = GFS2_I(inode);
160 struct gfs2_holder gh;
161 int error;
162 u32 fsflags;
163
164 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
165 error = gfs2_glock_nq(&gh);
166 if (error)
167 goto out_uninit;
168
169 fsflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags);
170
171 if (put_user(fsflags, ptr))
172 error = -EFAULT;
173
174 gfs2_glock_dq(&gh);
175out_uninit:
176 gfs2_holder_uninit(&gh);
177 return error;
178}
179
180void gfs2_set_inode_flags(struct inode *inode)
181{
182 struct gfs2_inode *ip = GFS2_I(inode);
183 unsigned int flags = inode->i_flags;
184
185 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC);
186 if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode))
187 flags |= S_NOSEC;
188 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
189 flags |= S_IMMUTABLE;
190 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
191 flags |= S_APPEND;
192 if (ip->i_diskflags & GFS2_DIF_NOATIME)
193 flags |= S_NOATIME;
194 if (ip->i_diskflags & GFS2_DIF_SYNC)
195 flags |= S_SYNC;
196 inode->i_flags = flags;
197}
198
199
200#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
201 GFS2_DIF_IMMUTABLE| \
202 GFS2_DIF_APPENDONLY| \
203 GFS2_DIF_NOATIME| \
204 GFS2_DIF_SYNC| \
205 GFS2_DIF_TOPDIR| \
206 GFS2_DIF_INHERIT_JDATA)
207
208
209
210
211
212
213
214
215
216static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask,
217 const u32 fsflags)
218{
219 struct inode *inode = file_inode(filp);
220 struct gfs2_inode *ip = GFS2_I(inode);
221 struct gfs2_sbd *sdp = GFS2_SB(inode);
222 struct buffer_head *bh;
223 struct gfs2_holder gh;
224 int error;
225 u32 new_flags, flags, oldflags;
226
227 error = mnt_want_write_file(filp);
228 if (error)
229 return error;
230
231 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
232 if (error)
233 goto out_drop_write;
234
235 oldflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags);
236 error = vfs_ioc_setflags_prepare(inode, oldflags, fsflags);
237 if (error)
238 goto out;
239
240 error = -EACCES;
241 if (!inode_owner_or_capable(inode))
242 goto out;
243
244 error = 0;
245 flags = ip->i_diskflags;
246 new_flags = (flags & ~mask) | (reqflags & mask);
247 if ((new_flags ^ flags) == 0)
248 goto out;
249
250 error = -EPERM;
251 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
252 goto out;
253 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
254 goto out;
255 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
256 !capable(CAP_LINUX_IMMUTABLE))
257 goto out;
258 if (!IS_IMMUTABLE(inode)) {
259 error = gfs2_permission(inode, MAY_WRITE);
260 if (error)
261 goto out;
262 }
263 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
264 if (new_flags & GFS2_DIF_JDATA)
265 gfs2_log_flush(sdp, ip->i_gl,
266 GFS2_LOG_HEAD_FLUSH_NORMAL |
267 GFS2_LFC_SET_FLAGS);
268 error = filemap_fdatawrite(inode->i_mapping);
269 if (error)
270 goto out;
271 error = filemap_fdatawait(inode->i_mapping);
272 if (error)
273 goto out;
274 if (new_flags & GFS2_DIF_JDATA)
275 gfs2_ordered_del_inode(ip);
276 }
277 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
278 if (error)
279 goto out;
280 error = gfs2_meta_inode_buffer(ip, &bh);
281 if (error)
282 goto out_trans_end;
283 inode->i_ctime = current_time(inode);
284 gfs2_trans_add_meta(ip->i_gl, bh);
285 ip->i_diskflags = new_flags;
286 gfs2_dinode_out(ip, bh->b_data);
287 brelse(bh);
288 gfs2_set_inode_flags(inode);
289 gfs2_set_aops(inode);
290out_trans_end:
291 gfs2_trans_end(sdp);
292out:
293 gfs2_glock_dq_uninit(&gh);
294out_drop_write:
295 mnt_drop_write_file(filp);
296 return error;
297}
298
299static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
300{
301 struct inode *inode = file_inode(filp);
302 u32 fsflags, gfsflags = 0;
303 u32 mask;
304 int i;
305
306 if (get_user(fsflags, ptr))
307 return -EFAULT;
308
309 for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) {
310 if (fsflags & fsflag_gfs2flag[i].fsflag) {
311 fsflags &= ~fsflag_gfs2flag[i].fsflag;
312 gfsflags |= fsflag_gfs2flag[i].gfsflag;
313 }
314 }
315 if (fsflags || gfsflags & ~GFS2_FLAGS_USER_SET)
316 return -EINVAL;
317
318 mask = GFS2_FLAGS_USER_SET;
319 if (S_ISDIR(inode->i_mode)) {
320 mask &= ~GFS2_DIF_JDATA;
321 } else {
322
323 if (gfsflags & GFS2_DIF_TOPDIR)
324 return -EINVAL;
325 mask &= ~(GFS2_DIF_TOPDIR | GFS2_DIF_INHERIT_JDATA);
326 }
327
328 return do_gfs2_set_flags(filp, gfsflags, mask, fsflags);
329}
330
331static int gfs2_getlabel(struct file *filp, char __user *label)
332{
333 struct inode *inode = file_inode(filp);
334 struct gfs2_sbd *sdp = GFS2_SB(inode);
335
336 if (copy_to_user(label, sdp->sd_sb.sb_locktable, GFS2_LOCKNAME_LEN))
337 return -EFAULT;
338
339 return 0;
340}
341
342static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
343{
344 switch(cmd) {
345 case FS_IOC_GETFLAGS:
346 return gfs2_get_flags(filp, (u32 __user *)arg);
347 case FS_IOC_SETFLAGS:
348 return gfs2_set_flags(filp, (u32 __user *)arg);
349 case FITRIM:
350 return gfs2_fitrim(filp, (void __user *)arg);
351 case FS_IOC_GETFSLABEL:
352 return gfs2_getlabel(filp, (char __user *)arg);
353 }
354
355 return -ENOTTY;
356}
357
358#ifdef CONFIG_COMPAT
359static long gfs2_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
360{
361 switch(cmd) {
362
363 case FS_IOC32_GETFLAGS:
364 cmd = FS_IOC_GETFLAGS;
365 break;
366 case FS_IOC32_SETFLAGS:
367 cmd = FS_IOC_SETFLAGS;
368 break;
369
370 case FITRIM:
371 case FS_IOC_GETFSLABEL:
372 break;
373 default:
374 return -ENOIOCTLCMD;
375 }
376
377 return gfs2_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
378}
379#else
380#define gfs2_compat_ioctl NULL
381#endif
382
383
384
385
386
387
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389
390
391
392
393
394
395static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size)
396{
397 struct inode *inode = file_inode(filep);
398 struct gfs2_sbd *sdp = GFS2_SB(inode);
399 struct gfs2_inode *ip = GFS2_I(inode);
400 size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift;
401 int hint = min_t(size_t, INT_MAX, blks);
402
403 if (hint > atomic_read(&ip->i_sizehint))
404 atomic_set(&ip->i_sizehint, hint);
405}
406
407
408
409
410
411
412
413
414
415
416
417static int gfs2_allocate_page_backing(struct page *page, unsigned int length)
418{
419 u64 pos = page_offset(page);
420
421 do {
422 struct iomap iomap = { };
423
424 if (gfs2_iomap_get_alloc(page->mapping->host, pos, length, &iomap))
425 return -EIO;
426
427 if (length < iomap.length)
428 iomap.length = length;
429 length -= iomap.length;
430 pos += iomap.length;
431 } while (length > 0);
432
433 return 0;
434}
435
436
437
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439
440
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442
443
444
445static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
446{
447 struct page *page = vmf->page;
448 struct inode *inode = file_inode(vmf->vma->vm_file);
449 struct gfs2_inode *ip = GFS2_I(inode);
450 struct gfs2_sbd *sdp = GFS2_SB(inode);
451 struct gfs2_alloc_parms ap = { .aflags = 0, };
452 u64 offset = page_offset(page);
453 unsigned int data_blocks, ind_blocks, rblocks;
454 struct gfs2_holder gh;
455 unsigned int length;
456 loff_t size;
457 int ret;
458
459 sb_start_pagefault(inode->i_sb);
460
461 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
462 ret = gfs2_glock_nq(&gh);
463 if (ret)
464 goto out_uninit;
465
466
467 size = i_size_read(inode);
468 if (offset >= size) {
469 ret = -EINVAL;
470 goto out_unlock;
471 }
472
473
474 file_update_time(vmf->vma->vm_file);
475
476
477 if (offset > size - PAGE_SIZE)
478 length = offset_in_page(size);
479 else
480 length = PAGE_SIZE;
481
482 gfs2_size_hint(vmf->vma->vm_file, offset, length);
483
484 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
485 set_bit(GIF_SW_PAGED, &ip->i_flags);
486
487
488
489
490
491
492 if (!gfs2_is_stuffed(ip) &&
493 !gfs2_write_alloc_required(ip, offset, length)) {
494 lock_page(page);
495 if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
496 ret = -EAGAIN;
497 unlock_page(page);
498 }
499 goto out_unlock;
500 }
501
502 ret = gfs2_rindex_update(sdp);
503 if (ret)
504 goto out_unlock;
505
506 gfs2_write_calc_reserv(ip, length, &data_blocks, &ind_blocks);
507 ap.target = data_blocks + ind_blocks;
508 ret = gfs2_quota_lock_check(ip, &ap);
509 if (ret)
510 goto out_unlock;
511 ret = gfs2_inplace_reserve(ip, &ap);
512 if (ret)
513 goto out_quota_unlock;
514
515 rblocks = RES_DINODE + ind_blocks;
516 if (gfs2_is_jdata(ip))
517 rblocks += data_blocks ? data_blocks : 1;
518 if (ind_blocks || data_blocks) {
519 rblocks += RES_STATFS + RES_QUOTA;
520 rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
521 }
522 ret = gfs2_trans_begin(sdp, rblocks, 0);
523 if (ret)
524 goto out_trans_fail;
525
526 lock_page(page);
527 ret = -EAGAIN;
528
529
530
531 if (!PageUptodate(page) || page->mapping != inode->i_mapping)
532 goto out_trans_end;
533
534
535 ret = 0;
536 if (gfs2_is_stuffed(ip))
537 ret = gfs2_unstuff_dinode(ip, page);
538 if (ret == 0)
539 ret = gfs2_allocate_page_backing(page, length);
540
541out_trans_end:
542 if (ret)
543 unlock_page(page);
544 gfs2_trans_end(sdp);
545out_trans_fail:
546 gfs2_inplace_release(ip);
547out_quota_unlock:
548 gfs2_quota_unlock(ip);
549out_unlock:
550 gfs2_glock_dq(&gh);
551out_uninit:
552 gfs2_holder_uninit(&gh);
553 if (ret == 0) {
554 set_page_dirty(page);
555 wait_for_stable_page(page);
556 }
557 sb_end_pagefault(inode->i_sb);
558 return block_page_mkwrite_return(ret);
559}
560
561static const struct vm_operations_struct gfs2_vm_ops = {
562 .fault = filemap_fault,
563 .map_pages = filemap_map_pages,
564 .page_mkwrite = gfs2_page_mkwrite,
565};
566
567
568
569
570
571
572
573
574
575
576
577
578
579static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
580{
581 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
582
583 if (!(file->f_flags & O_NOATIME) &&
584 !IS_NOATIME(&ip->i_inode)) {
585 struct gfs2_holder i_gh;
586 int error;
587
588 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
589 &i_gh);
590 if (error)
591 return error;
592
593 gfs2_glock_dq_uninit(&i_gh);
594 file_accessed(file);
595 }
596 vma->vm_ops = &gfs2_vm_ops;
597
598 return 0;
599}
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614int gfs2_open_common(struct inode *inode, struct file *file)
615{
616 struct gfs2_file *fp;
617 int ret;
618
619 if (S_ISREG(inode->i_mode)) {
620 ret = generic_file_open(inode, file);
621 if (ret)
622 return ret;
623 }
624
625 fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS);
626 if (!fp)
627 return -ENOMEM;
628
629 mutex_init(&fp->f_fl_mutex);
630
631 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
632 file->private_data = fp;
633 if (file->f_mode & FMODE_WRITE) {
634 ret = gfs2_qa_get(GFS2_I(inode));
635 if (ret)
636 goto fail;
637 }
638 return 0;
639
640fail:
641 kfree(file->private_data);
642 file->private_data = NULL;
643 return ret;
644}
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660static int gfs2_open(struct inode *inode, struct file *file)
661{
662 struct gfs2_inode *ip = GFS2_I(inode);
663 struct gfs2_holder i_gh;
664 int error;
665 bool need_unlock = false;
666
667 if (S_ISREG(ip->i_inode.i_mode)) {
668 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
669 &i_gh);
670 if (error)
671 return error;
672 need_unlock = true;
673 }
674
675 error = gfs2_open_common(inode, file);
676
677 if (need_unlock)
678 gfs2_glock_dq_uninit(&i_gh);
679
680 return error;
681}
682
683
684
685
686
687
688
689
690
691static int gfs2_release(struct inode *inode, struct file *file)
692{
693 struct gfs2_inode *ip = GFS2_I(inode);
694
695 kfree(file->private_data);
696 file->private_data = NULL;
697
698 if (file->f_mode & FMODE_WRITE) {
699 gfs2_rs_delete(ip, &inode->i_writecount);
700 gfs2_qa_put(ip);
701 }
702 return 0;
703}
704
705
706
707
708
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713
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715
716
717
718
719
720
721
722
723
724
725
726static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
727 int datasync)
728{
729 struct address_space *mapping = file->f_mapping;
730 struct inode *inode = mapping->host;
731 int sync_state = inode->i_state & I_DIRTY_ALL;
732 struct gfs2_inode *ip = GFS2_I(inode);
733 int ret = 0, ret1 = 0;
734
735 if (mapping->nrpages) {
736 ret1 = filemap_fdatawrite_range(mapping, start, end);
737 if (ret1 == -EIO)
738 return ret1;
739 }
740
741 if (!gfs2_is_jdata(ip))
742 sync_state &= ~I_DIRTY_PAGES;
743 if (datasync)
744 sync_state &= ~(I_DIRTY_SYNC | I_DIRTY_TIME);
745
746 if (sync_state) {
747 ret = sync_inode_metadata(inode, 1);
748 if (ret)
749 return ret;
750 if (gfs2_is_jdata(ip))
751 ret = file_write_and_wait(file);
752 if (ret)
753 return ret;
754 gfs2_ail_flush(ip->i_gl, 1);
755 }
756
757 if (mapping->nrpages)
758 ret = file_fdatawait_range(file, start, end);
759
760 return ret ? ret : ret1;
761}
762
763static ssize_t gfs2_file_direct_read(struct kiocb *iocb, struct iov_iter *to)
764{
765 struct file *file = iocb->ki_filp;
766 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
767 size_t count = iov_iter_count(to);
768 struct gfs2_holder gh;
769 ssize_t ret;
770
771 if (!count)
772 return 0;
773
774 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
775 ret = gfs2_glock_nq(&gh);
776 if (ret)
777 goto out_uninit;
778
779 ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL,
780 is_sync_kiocb(iocb));
781
782 gfs2_glock_dq(&gh);
783out_uninit:
784 gfs2_holder_uninit(&gh);
785 return ret;
786}
787
788static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
789{
790 struct file *file = iocb->ki_filp;
791 struct inode *inode = file->f_mapping->host;
792 struct gfs2_inode *ip = GFS2_I(inode);
793 size_t len = iov_iter_count(from);
794 loff_t offset = iocb->ki_pos;
795 struct gfs2_holder gh;
796 ssize_t ret;
797
798
799
800
801
802
803
804
805
806 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
807 ret = gfs2_glock_nq(&gh);
808 if (ret)
809 goto out_uninit;
810
811
812 if (offset + len > i_size_read(&ip->i_inode))
813 goto out;
814
815 ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL,
816 is_sync_kiocb(iocb));
817
818out:
819 gfs2_glock_dq(&gh);
820out_uninit:
821 gfs2_holder_uninit(&gh);
822 return ret;
823}
824
825static ssize_t gfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
826{
827 ssize_t ret;
828
829 if (iocb->ki_flags & IOCB_DIRECT) {
830 ret = gfs2_file_direct_read(iocb, to);
831 if (likely(ret != -ENOTBLK))
832 return ret;
833 iocb->ki_flags &= ~IOCB_DIRECT;
834 }
835 return generic_file_read_iter(iocb, to);
836}
837
838
839
840
841
842
843
844
845
846
847
848
849
850static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
851{
852 struct file *file = iocb->ki_filp;
853 struct inode *inode = file_inode(file);
854 struct gfs2_inode *ip = GFS2_I(inode);
855 ssize_t ret;
856
857 gfs2_size_hint(file, iocb->ki_pos, iov_iter_count(from));
858
859 if (iocb->ki_flags & IOCB_APPEND) {
860 struct gfs2_holder gh;
861
862 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
863 if (ret)
864 return ret;
865 gfs2_glock_dq_uninit(&gh);
866 }
867
868 inode_lock(inode);
869 ret = generic_write_checks(iocb, from);
870 if (ret <= 0)
871 goto out_unlock;
872
873 ret = file_remove_privs(file);
874 if (ret)
875 goto out_unlock;
876
877 ret = file_update_time(file);
878 if (ret)
879 goto out_unlock;
880
881 if (iocb->ki_flags & IOCB_DIRECT) {
882 struct address_space *mapping = file->f_mapping;
883 ssize_t buffered, ret2;
884
885 ret = gfs2_file_direct_write(iocb, from);
886 if (ret < 0 || !iov_iter_count(from))
887 goto out_unlock;
888
889 iocb->ki_flags |= IOCB_DSYNC;
890 current->backing_dev_info = inode_to_bdi(inode);
891 buffered = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
892 current->backing_dev_info = NULL;
893 if (unlikely(buffered <= 0))
894 goto out_unlock;
895
896
897
898
899
900
901
902
903 iocb->ki_pos += buffered;
904 ret2 = generic_write_sync(iocb, buffered);
905 invalidate_mapping_pages(mapping,
906 (iocb->ki_pos - buffered) >> PAGE_SHIFT,
907 (iocb->ki_pos - 1) >> PAGE_SHIFT);
908 if (!ret || ret2 > 0)
909 ret += ret2;
910 } else {
911 current->backing_dev_info = inode_to_bdi(inode);
912 ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
913 current->backing_dev_info = NULL;
914 if (likely(ret > 0)) {
915 iocb->ki_pos += ret;
916 ret = generic_write_sync(iocb, ret);
917 }
918 }
919
920out_unlock:
921 inode_unlock(inode);
922 return ret;
923}
924
925static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
926 int mode)
927{
928 struct super_block *sb = inode->i_sb;
929 struct gfs2_inode *ip = GFS2_I(inode);
930 loff_t end = offset + len;
931 struct buffer_head *dibh;
932 int error;
933
934 error = gfs2_meta_inode_buffer(ip, &dibh);
935 if (unlikely(error))
936 return error;
937
938 gfs2_trans_add_meta(ip->i_gl, dibh);
939
940 if (gfs2_is_stuffed(ip)) {
941 error = gfs2_unstuff_dinode(ip, NULL);
942 if (unlikely(error))
943 goto out;
944 }
945
946 while (offset < end) {
947 struct iomap iomap = { };
948
949 error = gfs2_iomap_get_alloc(inode, offset, end - offset,
950 &iomap);
951 if (error)
952 goto out;
953 offset = iomap.offset + iomap.length;
954 if (!(iomap.flags & IOMAP_F_NEW))
955 continue;
956 error = sb_issue_zeroout(sb, iomap.addr >> inode->i_blkbits,
957 iomap.length >> inode->i_blkbits,
958 GFP_NOFS);
959 if (error) {
960 fs_err(GFS2_SB(inode), "Failed to zero data buffers\n");
961 goto out;
962 }
963 }
964out:
965 brelse(dibh);
966 return error;
967}
968
969
970
971
972
973
974
975
976
977
978
979
980static void calc_max_reserv(struct gfs2_inode *ip, loff_t *len,
981 unsigned int *data_blocks, unsigned int *ind_blocks,
982 unsigned int max_blocks)
983{
984 loff_t max = *len;
985 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
986 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
987
988 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
989 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
990 max_data -= tmp;
991 }
992
993 *data_blocks = max_data;
994 *ind_blocks = max_blocks - max_data;
995 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
996 if (*len > max) {
997 *len = max;
998 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
999 }
1000}
1001
1002static long __gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
1003{
1004 struct inode *inode = file_inode(file);
1005 struct gfs2_sbd *sdp = GFS2_SB(inode);
1006 struct gfs2_inode *ip = GFS2_I(inode);
1007 struct gfs2_alloc_parms ap = { .aflags = 0, };
1008 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
1009 loff_t bytes, max_bytes, max_blks;
1010 int error;
1011 const loff_t pos = offset;
1012 const loff_t count = len;
1013 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
1014 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
1015 loff_t max_chunk_size = UINT_MAX & bsize_mask;
1016
1017 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
1018
1019 offset &= bsize_mask;
1020
1021 len = next - offset;
1022 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
1023 if (!bytes)
1024 bytes = UINT_MAX;
1025 bytes &= bsize_mask;
1026 if (bytes == 0)
1027 bytes = sdp->sd_sb.sb_bsize;
1028
1029 gfs2_size_hint(file, offset, len);
1030
1031 gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
1032 ap.min_target = data_blocks + ind_blocks;
1033
1034 while (len > 0) {
1035 if (len < bytes)
1036 bytes = len;
1037 if (!gfs2_write_alloc_required(ip, offset, bytes)) {
1038 len -= bytes;
1039 offset += bytes;
1040 continue;
1041 }
1042
1043
1044
1045
1046
1047 max_bytes = (len > max_chunk_size) ? max_chunk_size : len;
1048
1049
1050
1051
1052
1053 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
1054 ap.target = data_blocks + ind_blocks;
1055
1056 error = gfs2_quota_lock_check(ip, &ap);
1057 if (error)
1058 return error;
1059
1060
1061 max_blks = UINT_MAX;
1062 if (ap.allowed)
1063 max_blks = ap.allowed;
1064
1065 error = gfs2_inplace_reserve(ip, &ap);
1066 if (error)
1067 goto out_qunlock;
1068
1069
1070 if (ap.allowed && ap.allowed < max_blks)
1071 max_blks = ap.allowed;
1072
1073
1074
1075
1076 calc_max_reserv(ip, &max_bytes, &data_blocks,
1077 &ind_blocks, max_blks);
1078
1079 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
1080 RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks);
1081 if (gfs2_is_jdata(ip))
1082 rblocks += data_blocks ? data_blocks : 1;
1083
1084 error = gfs2_trans_begin(sdp, rblocks,
1085 PAGE_SIZE >> inode->i_blkbits);
1086 if (error)
1087 goto out_trans_fail;
1088
1089 error = fallocate_chunk(inode, offset, max_bytes, mode);
1090 gfs2_trans_end(sdp);
1091
1092 if (error)
1093 goto out_trans_fail;
1094
1095 len -= max_bytes;
1096 offset += max_bytes;
1097 gfs2_inplace_release(ip);
1098 gfs2_quota_unlock(ip);
1099 }
1100
1101 if (!(mode & FALLOC_FL_KEEP_SIZE) && (pos + count) > inode->i_size)
1102 i_size_write(inode, pos + count);
1103 file_update_time(file);
1104 mark_inode_dirty(inode);
1105
1106 if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host))
1107 return vfs_fsync_range(file, pos, pos + count - 1,
1108 (file->f_flags & __O_SYNC) ? 0 : 1);
1109 return 0;
1110
1111out_trans_fail:
1112 gfs2_inplace_release(ip);
1113out_qunlock:
1114 gfs2_quota_unlock(ip);
1115 return error;
1116}
1117
1118static long gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
1119{
1120 struct inode *inode = file_inode(file);
1121 struct gfs2_sbd *sdp = GFS2_SB(inode);
1122 struct gfs2_inode *ip = GFS2_I(inode);
1123 struct gfs2_holder gh;
1124 int ret;
1125
1126 if (mode & ~(FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE))
1127 return -EOPNOTSUPP;
1128
1129 if (gfs2_is_jdata(ip) && inode != sdp->sd_rindex)
1130 return -EOPNOTSUPP;
1131
1132 inode_lock(inode);
1133
1134 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1135 ret = gfs2_glock_nq(&gh);
1136 if (ret)
1137 goto out_uninit;
1138
1139 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
1140 (offset + len) > inode->i_size) {
1141 ret = inode_newsize_ok(inode, offset + len);
1142 if (ret)
1143 goto out_unlock;
1144 }
1145
1146 ret = get_write_access(inode);
1147 if (ret)
1148 goto out_unlock;
1149
1150 if (mode & FALLOC_FL_PUNCH_HOLE) {
1151 ret = __gfs2_punch_hole(file, offset, len);
1152 } else {
1153 ret = __gfs2_fallocate(file, mode, offset, len);
1154 if (ret)
1155 gfs2_rs_deltree(&ip->i_res);
1156 }
1157
1158 put_write_access(inode);
1159out_unlock:
1160 gfs2_glock_dq(&gh);
1161out_uninit:
1162 gfs2_holder_uninit(&gh);
1163 inode_unlock(inode);
1164 return ret;
1165}
1166
1167static ssize_t gfs2_file_splice_write(struct pipe_inode_info *pipe,
1168 struct file *out, loff_t *ppos,
1169 size_t len, unsigned int flags)
1170{
1171 ssize_t ret;
1172
1173 gfs2_size_hint(out, *ppos, len);
1174
1175 ret = iter_file_splice_write(pipe, out, ppos, len, flags);
1176 return ret;
1177}
1178
1179#ifdef CONFIG_GFS2_FS_LOCKING_DLM
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
1191{
1192 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
1193 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
1194 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1195
1196 if (!(fl->fl_flags & FL_POSIX))
1197 return -ENOLCK;
1198 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
1199 return -ENOLCK;
1200
1201 if (cmd == F_CANCELLK) {
1202
1203 cmd = F_SETLK;
1204 fl->fl_type = F_UNLCK;
1205 }
1206 if (unlikely(gfs2_withdrawn(sdp))) {
1207 if (fl->fl_type == F_UNLCK)
1208 locks_lock_file_wait(file, fl);
1209 return -EIO;
1210 }
1211 if (IS_GETLK(cmd))
1212 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
1213 else if (fl->fl_type == F_UNLCK)
1214 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
1215 else
1216 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
1217}
1218
1219static int do_flock(struct file *file, int cmd, struct file_lock *fl)
1220{
1221 struct gfs2_file *fp = file->private_data;
1222 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1223 struct gfs2_inode *ip = GFS2_I(file_inode(file));
1224 struct gfs2_glock *gl;
1225 unsigned int state;
1226 u16 flags;
1227 int error = 0;
1228 int sleeptime;
1229
1230 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
1231 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY_1CB) | GL_EXACT;
1232
1233 mutex_lock(&fp->f_fl_mutex);
1234
1235 if (gfs2_holder_initialized(fl_gh)) {
1236 struct file_lock request;
1237 if (fl_gh->gh_state == state)
1238 goto out;
1239 locks_init_lock(&request);
1240 request.fl_type = F_UNLCK;
1241 request.fl_flags = FL_FLOCK;
1242 locks_lock_file_wait(file, &request);
1243 gfs2_glock_dq(fl_gh);
1244 gfs2_holder_reinit(state, flags, fl_gh);
1245 } else {
1246 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
1247 &gfs2_flock_glops, CREATE, &gl);
1248 if (error)
1249 goto out;
1250 gfs2_holder_init(gl, state, flags, fl_gh);
1251 gfs2_glock_put(gl);
1252 }
1253 for (sleeptime = 1; sleeptime <= 4; sleeptime <<= 1) {
1254 error = gfs2_glock_nq(fl_gh);
1255 if (error != GLR_TRYFAILED)
1256 break;
1257 fl_gh->gh_flags = LM_FLAG_TRY | GL_EXACT;
1258 fl_gh->gh_error = 0;
1259 msleep(sleeptime);
1260 }
1261 if (error) {
1262 gfs2_holder_uninit(fl_gh);
1263 if (error == GLR_TRYFAILED)
1264 error = -EAGAIN;
1265 } else {
1266 error = locks_lock_file_wait(file, fl);
1267 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1268 }
1269
1270out:
1271 mutex_unlock(&fp->f_fl_mutex);
1272 return error;
1273}
1274
1275static void do_unflock(struct file *file, struct file_lock *fl)
1276{
1277 struct gfs2_file *fp = file->private_data;
1278 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1279
1280 mutex_lock(&fp->f_fl_mutex);
1281 locks_lock_file_wait(file, fl);
1282 if (gfs2_holder_initialized(fl_gh)) {
1283 gfs2_glock_dq(fl_gh);
1284 gfs2_holder_uninit(fl_gh);
1285 }
1286 mutex_unlock(&fp->f_fl_mutex);
1287}
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
1299{
1300 if (!(fl->fl_flags & FL_FLOCK))
1301 return -ENOLCK;
1302 if (fl->fl_type & LOCK_MAND)
1303 return -EOPNOTSUPP;
1304
1305 if (fl->fl_type == F_UNLCK) {
1306 do_unflock(file, fl);
1307 return 0;
1308 } else {
1309 return do_flock(file, cmd, fl);
1310 }
1311}
1312
1313const struct file_operations gfs2_file_fops = {
1314 .llseek = gfs2_llseek,
1315 .read_iter = gfs2_file_read_iter,
1316 .write_iter = gfs2_file_write_iter,
1317 .iopoll = iomap_dio_iopoll,
1318 .unlocked_ioctl = gfs2_ioctl,
1319 .compat_ioctl = gfs2_compat_ioctl,
1320 .mmap = gfs2_mmap,
1321 .open = gfs2_open,
1322 .release = gfs2_release,
1323 .fsync = gfs2_fsync,
1324 .lock = gfs2_lock,
1325 .flock = gfs2_flock,
1326 .splice_read = generic_file_splice_read,
1327 .splice_write = gfs2_file_splice_write,
1328 .setlease = simple_nosetlease,
1329 .fallocate = gfs2_fallocate,
1330};
1331
1332const struct file_operations gfs2_dir_fops = {
1333 .iterate_shared = gfs2_readdir,
1334 .unlocked_ioctl = gfs2_ioctl,
1335 .compat_ioctl = gfs2_compat_ioctl,
1336 .open = gfs2_open,
1337 .release = gfs2_release,
1338 .fsync = gfs2_fsync,
1339 .lock = gfs2_lock,
1340 .flock = gfs2_flock,
1341 .llseek = default_llseek,
1342};
1343
1344#endif
1345
1346const struct file_operations gfs2_file_fops_nolock = {
1347 .llseek = gfs2_llseek,
1348 .read_iter = gfs2_file_read_iter,
1349 .write_iter = gfs2_file_write_iter,
1350 .iopoll = iomap_dio_iopoll,
1351 .unlocked_ioctl = gfs2_ioctl,
1352 .compat_ioctl = gfs2_compat_ioctl,
1353 .mmap = gfs2_mmap,
1354 .open = gfs2_open,
1355 .release = gfs2_release,
1356 .fsync = gfs2_fsync,
1357 .splice_read = generic_file_splice_read,
1358 .splice_write = gfs2_file_splice_write,
1359 .setlease = generic_setlease,
1360 .fallocate = gfs2_fallocate,
1361};
1362
1363const struct file_operations gfs2_dir_fops_nolock = {
1364 .iterate_shared = gfs2_readdir,
1365 .unlocked_ioctl = gfs2_ioctl,
1366 .compat_ioctl = gfs2_compat_ioctl,
1367 .open = gfs2_open,
1368 .release = gfs2_release,
1369 .fsync = gfs2_fsync,
1370 .llseek = default_llseek,
1371};
1372
1373