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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#include <linux/fileattr.h>
29
30#include "gfs2.h"
31#include "incore.h"
32#include "bmap.h"
33#include "aops.h"
34#include "dir.h"
35#include "glock.h"
36#include "glops.h"
37#include "inode.h"
38#include "log.h"
39#include "meta_io.h"
40#include "quota.h"
41#include "rgrp.h"
42#include "trans.h"
43#include "util.h"
44
45
46
47
48
49
50
51
52
53
54
55
56
57static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence)
58{
59 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
60 struct gfs2_holder i_gh;
61 loff_t error;
62
63 switch (whence) {
64 case SEEK_END:
65 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
66 &i_gh);
67 if (!error) {
68 error = generic_file_llseek(file, offset, whence);
69 gfs2_glock_dq_uninit(&i_gh);
70 }
71 break;
72
73 case SEEK_DATA:
74 error = gfs2_seek_data(file, offset);
75 break;
76
77 case SEEK_HOLE:
78 error = gfs2_seek_hole(file, offset);
79 break;
80
81 case SEEK_CUR:
82 case SEEK_SET:
83
84
85
86
87 error = generic_file_llseek(file, offset, whence);
88 break;
89 default:
90 error = -EINVAL;
91 }
92
93 return error;
94}
95
96
97
98
99
100
101
102
103
104static int gfs2_readdir(struct file *file, struct dir_context *ctx)
105{
106 struct inode *dir = file->f_mapping->host;
107 struct gfs2_inode *dip = GFS2_I(dir);
108 struct gfs2_holder d_gh;
109 int error;
110
111 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
112 if (error)
113 return error;
114
115 error = gfs2_dir_read(dir, ctx, &file->f_ra);
116
117 gfs2_glock_dq_uninit(&d_gh);
118
119 return error;
120}
121
122
123
124
125
126
127
128static struct {
129 u32 fsflag;
130 u32 gfsflag;
131} fsflag_gfs2flag[] = {
132 {FS_SYNC_FL, GFS2_DIF_SYNC},
133 {FS_IMMUTABLE_FL, GFS2_DIF_IMMUTABLE},
134 {FS_APPEND_FL, GFS2_DIF_APPENDONLY},
135 {FS_NOATIME_FL, GFS2_DIF_NOATIME},
136 {FS_INDEX_FL, GFS2_DIF_EXHASH},
137 {FS_TOPDIR_FL, GFS2_DIF_TOPDIR},
138 {FS_JOURNAL_DATA_FL, GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA},
139};
140
141static inline u32 gfs2_gfsflags_to_fsflags(struct inode *inode, u32 gfsflags)
142{
143 int i;
144 u32 fsflags = 0;
145
146 if (S_ISDIR(inode->i_mode))
147 gfsflags &= ~GFS2_DIF_JDATA;
148 else
149 gfsflags &= ~GFS2_DIF_INHERIT_JDATA;
150
151 for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++)
152 if (gfsflags & fsflag_gfs2flag[i].gfsflag)
153 fsflags |= fsflag_gfs2flag[i].fsflag;
154 return fsflags;
155}
156
157int gfs2_fileattr_get(struct dentry *dentry, struct fileattr *fa)
158{
159 struct inode *inode = d_inode(dentry);
160 struct gfs2_inode *ip = GFS2_I(inode);
161 struct gfs2_holder gh;
162 int error;
163 u32 fsflags;
164
165 if (d_is_special(dentry))
166 return -ENOTTY;
167
168 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
169 error = gfs2_glock_nq(&gh);
170 if (error)
171 goto out_uninit;
172
173 fsflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags);
174
175 fileattr_fill_flags(fa, fsflags);
176
177 gfs2_glock_dq(&gh);
178out_uninit:
179 gfs2_holder_uninit(&gh);
180 return error;
181}
182
183void gfs2_set_inode_flags(struct inode *inode)
184{
185 struct gfs2_inode *ip = GFS2_I(inode);
186 unsigned int flags = inode->i_flags;
187
188 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC);
189 if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode))
190 flags |= S_NOSEC;
191 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
192 flags |= S_IMMUTABLE;
193 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
194 flags |= S_APPEND;
195 if (ip->i_diskflags & GFS2_DIF_NOATIME)
196 flags |= S_NOATIME;
197 if (ip->i_diskflags & GFS2_DIF_SYNC)
198 flags |= S_SYNC;
199 inode->i_flags = flags;
200}
201
202
203#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
204 GFS2_DIF_IMMUTABLE| \
205 GFS2_DIF_APPENDONLY| \
206 GFS2_DIF_NOATIME| \
207 GFS2_DIF_SYNC| \
208 GFS2_DIF_TOPDIR| \
209 GFS2_DIF_INHERIT_JDATA)
210
211
212
213
214
215
216
217
218
219static int do_gfs2_set_flags(struct inode *inode, u32 reqflags, u32 mask,
220 const u32 fsflags)
221{
222 struct gfs2_inode *ip = GFS2_I(inode);
223 struct gfs2_sbd *sdp = GFS2_SB(inode);
224 struct buffer_head *bh;
225 struct gfs2_holder gh;
226 int error;
227 u32 new_flags, flags;
228
229 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
230 if (error)
231 return error;
232
233 error = 0;
234 flags = ip->i_diskflags;
235 new_flags = (flags & ~mask) | (reqflags & mask);
236 if ((new_flags ^ flags) == 0)
237 goto out;
238
239 error = -EPERM;
240 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
241 goto out;
242 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
243 goto out;
244 if (!IS_IMMUTABLE(inode)) {
245 error = gfs2_permission(&init_user_ns, inode, MAY_WRITE);
246 if (error)
247 goto out;
248 }
249 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
250 if (new_flags & GFS2_DIF_JDATA)
251 gfs2_log_flush(sdp, ip->i_gl,
252 GFS2_LOG_HEAD_FLUSH_NORMAL |
253 GFS2_LFC_SET_FLAGS);
254 error = filemap_fdatawrite(inode->i_mapping);
255 if (error)
256 goto out;
257 error = filemap_fdatawait(inode->i_mapping);
258 if (error)
259 goto out;
260 if (new_flags & GFS2_DIF_JDATA)
261 gfs2_ordered_del_inode(ip);
262 }
263 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
264 if (error)
265 goto out;
266 error = gfs2_meta_inode_buffer(ip, &bh);
267 if (error)
268 goto out_trans_end;
269 inode->i_ctime = current_time(inode);
270 gfs2_trans_add_meta(ip->i_gl, bh);
271 ip->i_diskflags = new_flags;
272 gfs2_dinode_out(ip, bh->b_data);
273 brelse(bh);
274 gfs2_set_inode_flags(inode);
275 gfs2_set_aops(inode);
276out_trans_end:
277 gfs2_trans_end(sdp);
278out:
279 gfs2_glock_dq_uninit(&gh);
280 return error;
281}
282
283int gfs2_fileattr_set(struct user_namespace *mnt_userns,
284 struct dentry *dentry, struct fileattr *fa)
285{
286 struct inode *inode = d_inode(dentry);
287 u32 fsflags = fa->flags, gfsflags = 0;
288 u32 mask;
289 int i;
290
291 if (d_is_special(dentry))
292 return -ENOTTY;
293
294 if (fileattr_has_fsx(fa))
295 return -EOPNOTSUPP;
296
297 for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) {
298 if (fsflags & fsflag_gfs2flag[i].fsflag) {
299 fsflags &= ~fsflag_gfs2flag[i].fsflag;
300 gfsflags |= fsflag_gfs2flag[i].gfsflag;
301 }
302 }
303 if (fsflags || gfsflags & ~GFS2_FLAGS_USER_SET)
304 return -EINVAL;
305
306 mask = GFS2_FLAGS_USER_SET;
307 if (S_ISDIR(inode->i_mode)) {
308 mask &= ~GFS2_DIF_JDATA;
309 } else {
310
311 if (gfsflags & GFS2_DIF_TOPDIR)
312 return -EINVAL;
313 mask &= ~(GFS2_DIF_TOPDIR | GFS2_DIF_INHERIT_JDATA);
314 }
315
316 return do_gfs2_set_flags(inode, gfsflags, mask, fsflags);
317}
318
319static int gfs2_getlabel(struct file *filp, char __user *label)
320{
321 struct inode *inode = file_inode(filp);
322 struct gfs2_sbd *sdp = GFS2_SB(inode);
323
324 if (copy_to_user(label, sdp->sd_sb.sb_locktable, GFS2_LOCKNAME_LEN))
325 return -EFAULT;
326
327 return 0;
328}
329
330static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
331{
332 switch(cmd) {
333 case FITRIM:
334 return gfs2_fitrim(filp, (void __user *)arg);
335 case FS_IOC_GETFSLABEL:
336 return gfs2_getlabel(filp, (char __user *)arg);
337 }
338
339 return -ENOTTY;
340}
341
342#ifdef CONFIG_COMPAT
343static long gfs2_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
344{
345 switch(cmd) {
346
347 case FITRIM:
348 case FS_IOC_GETFSLABEL:
349 break;
350 default:
351 return -ENOIOCTLCMD;
352 }
353
354 return gfs2_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
355}
356#else
357#define gfs2_compat_ioctl NULL
358#endif
359
360
361
362
363
364
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367
368
369
370
371
372static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size)
373{
374 struct inode *inode = file_inode(filep);
375 struct gfs2_sbd *sdp = GFS2_SB(inode);
376 struct gfs2_inode *ip = GFS2_I(inode);
377 size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift;
378 int hint = min_t(size_t, INT_MAX, blks);
379
380 if (hint > atomic_read(&ip->i_sizehint))
381 atomic_set(&ip->i_sizehint, hint);
382}
383
384
385
386
387
388
389
390
391
392
393
394static int gfs2_allocate_page_backing(struct page *page, unsigned int length)
395{
396 u64 pos = page_offset(page);
397
398 do {
399 struct iomap iomap = { };
400
401 if (gfs2_iomap_alloc(page->mapping->host, pos, length, &iomap))
402 return -EIO;
403
404 if (length < iomap.length)
405 iomap.length = length;
406 length -= iomap.length;
407 pos += iomap.length;
408 } while (length > 0);
409
410 return 0;
411}
412
413
414
415
416
417
418
419
420
421static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
422{
423 struct page *page = vmf->page;
424 struct inode *inode = file_inode(vmf->vma->vm_file);
425 struct gfs2_inode *ip = GFS2_I(inode);
426 struct gfs2_sbd *sdp = GFS2_SB(inode);
427 struct gfs2_alloc_parms ap = { .aflags = 0, };
428 u64 offset = page_offset(page);
429 unsigned int data_blocks, ind_blocks, rblocks;
430 vm_fault_t ret = VM_FAULT_LOCKED;
431 struct gfs2_holder gh;
432 unsigned int length;
433 loff_t size;
434 int err;
435
436 sb_start_pagefault(inode->i_sb);
437
438 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
439 err = gfs2_glock_nq(&gh);
440 if (err) {
441 ret = block_page_mkwrite_return(err);
442 goto out_uninit;
443 }
444
445
446 size = i_size_read(inode);
447 if (offset >= size) {
448 ret = VM_FAULT_SIGBUS;
449 goto out_unlock;
450 }
451
452
453 file_update_time(vmf->vma->vm_file);
454
455
456 if (size - offset < PAGE_SIZE)
457 length = size - offset;
458 else
459 length = PAGE_SIZE;
460
461 gfs2_size_hint(vmf->vma->vm_file, offset, length);
462
463 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
464 set_bit(GIF_SW_PAGED, &ip->i_flags);
465
466
467
468
469
470
471 if (!gfs2_is_stuffed(ip) &&
472 !gfs2_write_alloc_required(ip, offset, length)) {
473 lock_page(page);
474 if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
475 ret = VM_FAULT_NOPAGE;
476 unlock_page(page);
477 }
478 goto out_unlock;
479 }
480
481 err = gfs2_rindex_update(sdp);
482 if (err) {
483 ret = block_page_mkwrite_return(err);
484 goto out_unlock;
485 }
486
487 gfs2_write_calc_reserv(ip, length, &data_blocks, &ind_blocks);
488 ap.target = data_blocks + ind_blocks;
489 err = gfs2_quota_lock_check(ip, &ap);
490 if (err) {
491 ret = block_page_mkwrite_return(err);
492 goto out_unlock;
493 }
494 err = gfs2_inplace_reserve(ip, &ap);
495 if (err) {
496 ret = block_page_mkwrite_return(err);
497 goto out_quota_unlock;
498 }
499
500 rblocks = RES_DINODE + ind_blocks;
501 if (gfs2_is_jdata(ip))
502 rblocks += data_blocks ? data_blocks : 1;
503 if (ind_blocks || data_blocks) {
504 rblocks += RES_STATFS + RES_QUOTA;
505 rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
506 }
507 err = gfs2_trans_begin(sdp, rblocks, 0);
508 if (err) {
509 ret = block_page_mkwrite_return(err);
510 goto out_trans_fail;
511 }
512
513
514 if (gfs2_is_stuffed(ip)) {
515 err = gfs2_unstuff_dinode(ip);
516 if (err) {
517 ret = block_page_mkwrite_return(err);
518 goto out_trans_end;
519 }
520 }
521
522 lock_page(page);
523
524
525
526 if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
527 ret = VM_FAULT_NOPAGE;
528 goto out_page_locked;
529 }
530
531 err = gfs2_allocate_page_backing(page, length);
532 if (err)
533 ret = block_page_mkwrite_return(err);
534
535out_page_locked:
536 if (ret != VM_FAULT_LOCKED)
537 unlock_page(page);
538out_trans_end:
539 gfs2_trans_end(sdp);
540out_trans_fail:
541 gfs2_inplace_release(ip);
542out_quota_unlock:
543 gfs2_quota_unlock(ip);
544out_unlock:
545 gfs2_glock_dq(&gh);
546out_uninit:
547 gfs2_holder_uninit(&gh);
548 if (ret == VM_FAULT_LOCKED) {
549 set_page_dirty(page);
550 wait_for_stable_page(page);
551 }
552 sb_end_pagefault(inode->i_sb);
553 return ret;
554}
555
556static vm_fault_t gfs2_fault(struct vm_fault *vmf)
557{
558 struct inode *inode = file_inode(vmf->vma->vm_file);
559 struct gfs2_inode *ip = GFS2_I(inode);
560 struct gfs2_holder gh;
561 vm_fault_t ret;
562 int err;
563
564 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
565 err = gfs2_glock_nq(&gh);
566 if (err) {
567 ret = block_page_mkwrite_return(err);
568 goto out_uninit;
569 }
570 ret = filemap_fault(vmf);
571 gfs2_glock_dq(&gh);
572out_uninit:
573 gfs2_holder_uninit(&gh);
574 return ret;
575}
576
577static const struct vm_operations_struct gfs2_vm_ops = {
578 .fault = gfs2_fault,
579 .map_pages = filemap_map_pages,
580 .page_mkwrite = gfs2_page_mkwrite,
581};
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583
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593
594
595static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
596{
597 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
598
599 if (!(file->f_flags & O_NOATIME) &&
600 !IS_NOATIME(&ip->i_inode)) {
601 struct gfs2_holder i_gh;
602 int error;
603
604 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
605 &i_gh);
606 if (error)
607 return error;
608
609 gfs2_glock_dq_uninit(&i_gh);
610 file_accessed(file);
611 }
612 vma->vm_ops = &gfs2_vm_ops;
613
614 return 0;
615}
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617
618
619
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621
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623
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625
626
627
628
629
630int gfs2_open_common(struct inode *inode, struct file *file)
631{
632 struct gfs2_file *fp;
633 int ret;
634
635 if (S_ISREG(inode->i_mode)) {
636 ret = generic_file_open(inode, file);
637 if (ret)
638 return ret;
639 }
640
641 fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS);
642 if (!fp)
643 return -ENOMEM;
644
645 mutex_init(&fp->f_fl_mutex);
646
647 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
648 file->private_data = fp;
649 if (file->f_mode & FMODE_WRITE) {
650 ret = gfs2_qa_get(GFS2_I(inode));
651 if (ret)
652 goto fail;
653 }
654 return 0;
655
656fail:
657 kfree(file->private_data);
658 file->private_data = NULL;
659 return ret;
660}
661
662
663
664
665
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669
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675
676static int gfs2_open(struct inode *inode, struct file *file)
677{
678 struct gfs2_inode *ip = GFS2_I(inode);
679 struct gfs2_holder i_gh;
680 int error;
681 bool need_unlock = false;
682
683 if (S_ISREG(ip->i_inode.i_mode)) {
684 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
685 &i_gh);
686 if (error)
687 return error;
688 need_unlock = true;
689 }
690
691 error = gfs2_open_common(inode, file);
692
693 if (need_unlock)
694 gfs2_glock_dq_uninit(&i_gh);
695
696 return error;
697}
698
699
700
701
702
703
704
705
706
707static int gfs2_release(struct inode *inode, struct file *file)
708{
709 struct gfs2_inode *ip = GFS2_I(inode);
710
711 kfree(file->private_data);
712 file->private_data = NULL;
713
714 if (gfs2_rs_active(&ip->i_res))
715 gfs2_rs_delete(ip, &inode->i_writecount);
716 if (file->f_mode & FMODE_WRITE)
717 gfs2_qa_put(ip);
718 return 0;
719}
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741
742static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
743 int datasync)
744{
745 struct address_space *mapping = file->f_mapping;
746 struct inode *inode = mapping->host;
747 int sync_state = inode->i_state & I_DIRTY;
748 struct gfs2_inode *ip = GFS2_I(inode);
749 int ret = 0, ret1 = 0;
750
751 if (mapping->nrpages) {
752 ret1 = filemap_fdatawrite_range(mapping, start, end);
753 if (ret1 == -EIO)
754 return ret1;
755 }
756
757 if (!gfs2_is_jdata(ip))
758 sync_state &= ~I_DIRTY_PAGES;
759 if (datasync)
760 sync_state &= ~I_DIRTY_SYNC;
761
762 if (sync_state) {
763 ret = sync_inode_metadata(inode, 1);
764 if (ret)
765 return ret;
766 if (gfs2_is_jdata(ip))
767 ret = file_write_and_wait(file);
768 if (ret)
769 return ret;
770 gfs2_ail_flush(ip->i_gl, 1);
771 }
772
773 if (mapping->nrpages)
774 ret = file_fdatawait_range(file, start, end);
775
776 return ret ? ret : ret1;
777}
778
779static ssize_t gfs2_file_direct_read(struct kiocb *iocb, struct iov_iter *to,
780 struct gfs2_holder *gh)
781{
782 struct file *file = iocb->ki_filp;
783 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
784 size_t count = iov_iter_count(to);
785 ssize_t ret;
786
787 if (!count)
788 return 0;
789
790 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, gh);
791 ret = gfs2_glock_nq(gh);
792 if (ret)
793 goto out_uninit;
794
795 ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL, 0);
796 gfs2_glock_dq(gh);
797out_uninit:
798 gfs2_holder_uninit(gh);
799 return ret;
800}
801
802static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from,
803 struct gfs2_holder *gh)
804{
805 struct file *file = iocb->ki_filp;
806 struct inode *inode = file->f_mapping->host;
807 struct gfs2_inode *ip = GFS2_I(inode);
808 size_t len = iov_iter_count(from);
809 loff_t offset = iocb->ki_pos;
810 ssize_t ret;
811
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818
819
820 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, gh);
821 ret = gfs2_glock_nq(gh);
822 if (ret)
823 goto out_uninit;
824
825
826 if (offset + len > i_size_read(&ip->i_inode))
827 goto out;
828
829 ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL, 0);
830 if (ret == -ENOTBLK)
831 ret = 0;
832out:
833 gfs2_glock_dq(gh);
834out_uninit:
835 gfs2_holder_uninit(gh);
836 return ret;
837}
838
839static ssize_t gfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
840{
841 struct gfs2_inode *ip;
842 struct gfs2_holder gh;
843 size_t written = 0;
844 ssize_t ret;
845
846 if (iocb->ki_flags & IOCB_DIRECT) {
847 ret = gfs2_file_direct_read(iocb, to, &gh);
848 if (likely(ret != -ENOTBLK))
849 return ret;
850 iocb->ki_flags &= ~IOCB_DIRECT;
851 }
852 iocb->ki_flags |= IOCB_NOIO;
853 ret = generic_file_read_iter(iocb, to);
854 iocb->ki_flags &= ~IOCB_NOIO;
855 if (ret >= 0) {
856 if (!iov_iter_count(to))
857 return ret;
858 written = ret;
859 } else {
860 if (ret != -EAGAIN)
861 return ret;
862 if (iocb->ki_flags & IOCB_NOWAIT)
863 return ret;
864 }
865 ip = GFS2_I(iocb->ki_filp->f_mapping->host);
866 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
867 ret = gfs2_glock_nq(&gh);
868 if (ret)
869 goto out_uninit;
870 ret = generic_file_read_iter(iocb, to);
871 if (ret > 0)
872 written += ret;
873 gfs2_glock_dq(&gh);
874out_uninit:
875 gfs2_holder_uninit(&gh);
876 return written ? written : ret;
877}
878
879
880
881
882
883
884
885
886
887
888
889
890
891static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
892{
893 struct file *file = iocb->ki_filp;
894 struct inode *inode = file_inode(file);
895 struct gfs2_inode *ip = GFS2_I(inode);
896 struct gfs2_holder gh;
897 ssize_t ret;
898
899 gfs2_size_hint(file, iocb->ki_pos, iov_iter_count(from));
900
901 if (iocb->ki_flags & IOCB_APPEND) {
902 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
903 if (ret)
904 return ret;
905 gfs2_glock_dq_uninit(&gh);
906 }
907
908 inode_lock(inode);
909 ret = generic_write_checks(iocb, from);
910 if (ret <= 0)
911 goto out_unlock;
912
913 ret = file_remove_privs(file);
914 if (ret)
915 goto out_unlock;
916
917 ret = file_update_time(file);
918 if (ret)
919 goto out_unlock;
920
921 if (iocb->ki_flags & IOCB_DIRECT) {
922 struct address_space *mapping = file->f_mapping;
923 ssize_t buffered, ret2;
924
925 ret = gfs2_file_direct_write(iocb, from, &gh);
926 if (ret < 0 || !iov_iter_count(from))
927 goto out_unlock;
928
929 iocb->ki_flags |= IOCB_DSYNC;
930 current->backing_dev_info = inode_to_bdi(inode);
931 buffered = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
932 current->backing_dev_info = NULL;
933 if (unlikely(buffered <= 0)) {
934 if (!ret)
935 ret = buffered;
936 goto out_unlock;
937 }
938
939
940
941
942
943
944
945
946 iocb->ki_pos += buffered;
947 ret2 = generic_write_sync(iocb, buffered);
948 invalidate_mapping_pages(mapping,
949 (iocb->ki_pos - buffered) >> PAGE_SHIFT,
950 (iocb->ki_pos - 1) >> PAGE_SHIFT);
951 if (!ret || ret2 > 0)
952 ret += ret2;
953 } else {
954 current->backing_dev_info = inode_to_bdi(inode);
955 ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
956 current->backing_dev_info = NULL;
957 if (likely(ret > 0)) {
958 iocb->ki_pos += ret;
959 ret = generic_write_sync(iocb, ret);
960 }
961 }
962
963out_unlock:
964 inode_unlock(inode);
965 return ret;
966}
967
968static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
969 int mode)
970{
971 struct super_block *sb = inode->i_sb;
972 struct gfs2_inode *ip = GFS2_I(inode);
973 loff_t end = offset + len;
974 struct buffer_head *dibh;
975 int error;
976
977 error = gfs2_meta_inode_buffer(ip, &dibh);
978 if (unlikely(error))
979 return error;
980
981 gfs2_trans_add_meta(ip->i_gl, dibh);
982
983 if (gfs2_is_stuffed(ip)) {
984 error = gfs2_unstuff_dinode(ip);
985 if (unlikely(error))
986 goto out;
987 }
988
989 while (offset < end) {
990 struct iomap iomap = { };
991
992 error = gfs2_iomap_alloc(inode, offset, end - offset, &iomap);
993 if (error)
994 goto out;
995 offset = iomap.offset + iomap.length;
996 if (!(iomap.flags & IOMAP_F_NEW))
997 continue;
998 error = sb_issue_zeroout(sb, iomap.addr >> inode->i_blkbits,
999 iomap.length >> inode->i_blkbits,
1000 GFP_NOFS);
1001 if (error) {
1002 fs_err(GFS2_SB(inode), "Failed to zero data buffers\n");
1003 goto out;
1004 }
1005 }
1006out:
1007 brelse(dibh);
1008 return error;
1009}
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022static void calc_max_reserv(struct gfs2_inode *ip, loff_t *len,
1023 unsigned int *data_blocks, unsigned int *ind_blocks,
1024 unsigned int max_blocks)
1025{
1026 loff_t max = *len;
1027 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1028 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
1029
1030 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
1031 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
1032 max_data -= tmp;
1033 }
1034
1035 *data_blocks = max_data;
1036 *ind_blocks = max_blocks - max_data;
1037 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
1038 if (*len > max) {
1039 *len = max;
1040 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
1041 }
1042}
1043
1044static long __gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
1045{
1046 struct inode *inode = file_inode(file);
1047 struct gfs2_sbd *sdp = GFS2_SB(inode);
1048 struct gfs2_inode *ip = GFS2_I(inode);
1049 struct gfs2_alloc_parms ap = { .aflags = 0, };
1050 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
1051 loff_t bytes, max_bytes, max_blks;
1052 int error;
1053 const loff_t pos = offset;
1054 const loff_t count = len;
1055 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
1056 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
1057 loff_t max_chunk_size = UINT_MAX & bsize_mask;
1058
1059 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
1060
1061 offset &= bsize_mask;
1062
1063 len = next - offset;
1064 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
1065 if (!bytes)
1066 bytes = UINT_MAX;
1067 bytes &= bsize_mask;
1068 if (bytes == 0)
1069 bytes = sdp->sd_sb.sb_bsize;
1070
1071 gfs2_size_hint(file, offset, len);
1072
1073 gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
1074 ap.min_target = data_blocks + ind_blocks;
1075
1076 while (len > 0) {
1077 if (len < bytes)
1078 bytes = len;
1079 if (!gfs2_write_alloc_required(ip, offset, bytes)) {
1080 len -= bytes;
1081 offset += bytes;
1082 continue;
1083 }
1084
1085
1086
1087
1088
1089 max_bytes = (len > max_chunk_size) ? max_chunk_size : len;
1090
1091
1092
1093
1094
1095 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
1096 ap.target = data_blocks + ind_blocks;
1097
1098 error = gfs2_quota_lock_check(ip, &ap);
1099 if (error)
1100 return error;
1101
1102
1103 max_blks = UINT_MAX;
1104 if (ap.allowed)
1105 max_blks = ap.allowed;
1106
1107 error = gfs2_inplace_reserve(ip, &ap);
1108 if (error)
1109 goto out_qunlock;
1110
1111
1112 if (ip->i_res.rs_reserved < max_blks)
1113 max_blks = ip->i_res.rs_reserved;
1114
1115
1116
1117
1118 calc_max_reserv(ip, &max_bytes, &data_blocks,
1119 &ind_blocks, max_blks);
1120
1121 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
1122 RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks);
1123 if (gfs2_is_jdata(ip))
1124 rblocks += data_blocks ? data_blocks : 1;
1125
1126 error = gfs2_trans_begin(sdp, rblocks,
1127 PAGE_SIZE >> inode->i_blkbits);
1128 if (error)
1129 goto out_trans_fail;
1130
1131 error = fallocate_chunk(inode, offset, max_bytes, mode);
1132 gfs2_trans_end(sdp);
1133
1134 if (error)
1135 goto out_trans_fail;
1136
1137 len -= max_bytes;
1138 offset += max_bytes;
1139 gfs2_inplace_release(ip);
1140 gfs2_quota_unlock(ip);
1141 }
1142
1143 if (!(mode & FALLOC_FL_KEEP_SIZE) && (pos + count) > inode->i_size)
1144 i_size_write(inode, pos + count);
1145 file_update_time(file);
1146 mark_inode_dirty(inode);
1147
1148 if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host))
1149 return vfs_fsync_range(file, pos, pos + count - 1,
1150 (file->f_flags & __O_SYNC) ? 0 : 1);
1151 return 0;
1152
1153out_trans_fail:
1154 gfs2_inplace_release(ip);
1155out_qunlock:
1156 gfs2_quota_unlock(ip);
1157 return error;
1158}
1159
1160static long gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
1161{
1162 struct inode *inode = file_inode(file);
1163 struct gfs2_sbd *sdp = GFS2_SB(inode);
1164 struct gfs2_inode *ip = GFS2_I(inode);
1165 struct gfs2_holder gh;
1166 int ret;
1167
1168 if (mode & ~(FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE))
1169 return -EOPNOTSUPP;
1170
1171 if (gfs2_is_jdata(ip) && inode != sdp->sd_rindex)
1172 return -EOPNOTSUPP;
1173
1174 inode_lock(inode);
1175
1176 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1177 ret = gfs2_glock_nq(&gh);
1178 if (ret)
1179 goto out_uninit;
1180
1181 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
1182 (offset + len) > inode->i_size) {
1183 ret = inode_newsize_ok(inode, offset + len);
1184 if (ret)
1185 goto out_unlock;
1186 }
1187
1188 ret = get_write_access(inode);
1189 if (ret)
1190 goto out_unlock;
1191
1192 if (mode & FALLOC_FL_PUNCH_HOLE) {
1193 ret = __gfs2_punch_hole(file, offset, len);
1194 } else {
1195 ret = __gfs2_fallocate(file, mode, offset, len);
1196 if (ret)
1197 gfs2_rs_deltree(&ip->i_res);
1198 }
1199
1200 put_write_access(inode);
1201out_unlock:
1202 gfs2_glock_dq(&gh);
1203out_uninit:
1204 gfs2_holder_uninit(&gh);
1205 inode_unlock(inode);
1206 return ret;
1207}
1208
1209static ssize_t gfs2_file_splice_write(struct pipe_inode_info *pipe,
1210 struct file *out, loff_t *ppos,
1211 size_t len, unsigned int flags)
1212{
1213 ssize_t ret;
1214
1215 gfs2_size_hint(out, *ppos, len);
1216
1217 ret = iter_file_splice_write(pipe, out, ppos, len, flags);
1218 return ret;
1219}
1220
1221#ifdef CONFIG_GFS2_FS_LOCKING_DLM
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
1233{
1234 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
1235 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
1236 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1237
1238 if (!(fl->fl_flags & FL_POSIX))
1239 return -ENOLCK;
1240 if (cmd == F_CANCELLK) {
1241
1242 cmd = F_SETLK;
1243 fl->fl_type = F_UNLCK;
1244 }
1245 if (unlikely(gfs2_withdrawn(sdp))) {
1246 if (fl->fl_type == F_UNLCK)
1247 locks_lock_file_wait(file, fl);
1248 return -EIO;
1249 }
1250 if (IS_GETLK(cmd))
1251 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
1252 else if (fl->fl_type == F_UNLCK)
1253 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
1254 else
1255 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
1256}
1257
1258static int do_flock(struct file *file, int cmd, struct file_lock *fl)
1259{
1260 struct gfs2_file *fp = file->private_data;
1261 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1262 struct gfs2_inode *ip = GFS2_I(file_inode(file));
1263 struct gfs2_glock *gl;
1264 unsigned int state;
1265 u16 flags;
1266 int error = 0;
1267 int sleeptime;
1268
1269 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
1270 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY_1CB) | GL_EXACT;
1271
1272 mutex_lock(&fp->f_fl_mutex);
1273
1274 if (gfs2_holder_initialized(fl_gh)) {
1275 struct file_lock request;
1276 if (fl_gh->gh_state == state)
1277 goto out;
1278 locks_init_lock(&request);
1279 request.fl_type = F_UNLCK;
1280 request.fl_flags = FL_FLOCK;
1281 locks_lock_file_wait(file, &request);
1282 gfs2_glock_dq(fl_gh);
1283 gfs2_holder_reinit(state, flags, fl_gh);
1284 } else {
1285 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
1286 &gfs2_flock_glops, CREATE, &gl);
1287 if (error)
1288 goto out;
1289 gfs2_holder_init(gl, state, flags, fl_gh);
1290 gfs2_glock_put(gl);
1291 }
1292 for (sleeptime = 1; sleeptime <= 4; sleeptime <<= 1) {
1293 error = gfs2_glock_nq(fl_gh);
1294 if (error != GLR_TRYFAILED)
1295 break;
1296 fl_gh->gh_flags = LM_FLAG_TRY | GL_EXACT;
1297 fl_gh->gh_error = 0;
1298 msleep(sleeptime);
1299 }
1300 if (error) {
1301 gfs2_holder_uninit(fl_gh);
1302 if (error == GLR_TRYFAILED)
1303 error = -EAGAIN;
1304 } else {
1305 error = locks_lock_file_wait(file, fl);
1306 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1307 }
1308
1309out:
1310 mutex_unlock(&fp->f_fl_mutex);
1311 return error;
1312}
1313
1314static void do_unflock(struct file *file, struct file_lock *fl)
1315{
1316 struct gfs2_file *fp = file->private_data;
1317 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1318
1319 mutex_lock(&fp->f_fl_mutex);
1320 locks_lock_file_wait(file, fl);
1321 if (gfs2_holder_initialized(fl_gh)) {
1322 gfs2_glock_dq(fl_gh);
1323 gfs2_holder_uninit(fl_gh);
1324 }
1325 mutex_unlock(&fp->f_fl_mutex);
1326}
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
1338{
1339 if (!(fl->fl_flags & FL_FLOCK))
1340 return -ENOLCK;
1341 if (fl->fl_type & LOCK_MAND)
1342 return -EOPNOTSUPP;
1343
1344 if (fl->fl_type == F_UNLCK) {
1345 do_unflock(file, fl);
1346 return 0;
1347 } else {
1348 return do_flock(file, cmd, fl);
1349 }
1350}
1351
1352const struct file_operations gfs2_file_fops = {
1353 .llseek = gfs2_llseek,
1354 .read_iter = gfs2_file_read_iter,
1355 .write_iter = gfs2_file_write_iter,
1356 .iopoll = iomap_dio_iopoll,
1357 .unlocked_ioctl = gfs2_ioctl,
1358 .compat_ioctl = gfs2_compat_ioctl,
1359 .mmap = gfs2_mmap,
1360 .open = gfs2_open,
1361 .release = gfs2_release,
1362 .fsync = gfs2_fsync,
1363 .lock = gfs2_lock,
1364 .flock = gfs2_flock,
1365 .splice_read = generic_file_splice_read,
1366 .splice_write = gfs2_file_splice_write,
1367 .setlease = simple_nosetlease,
1368 .fallocate = gfs2_fallocate,
1369};
1370
1371const struct file_operations gfs2_dir_fops = {
1372 .iterate_shared = gfs2_readdir,
1373 .unlocked_ioctl = gfs2_ioctl,
1374 .compat_ioctl = gfs2_compat_ioctl,
1375 .open = gfs2_open,
1376 .release = gfs2_release,
1377 .fsync = gfs2_fsync,
1378 .lock = gfs2_lock,
1379 .flock = gfs2_flock,
1380 .llseek = default_llseek,
1381};
1382
1383#endif
1384
1385const struct file_operations gfs2_file_fops_nolock = {
1386 .llseek = gfs2_llseek,
1387 .read_iter = gfs2_file_read_iter,
1388 .write_iter = gfs2_file_write_iter,
1389 .iopoll = iomap_dio_iopoll,
1390 .unlocked_ioctl = gfs2_ioctl,
1391 .compat_ioctl = gfs2_compat_ioctl,
1392 .mmap = gfs2_mmap,
1393 .open = gfs2_open,
1394 .release = gfs2_release,
1395 .fsync = gfs2_fsync,
1396 .splice_read = generic_file_splice_read,
1397 .splice_write = gfs2_file_splice_write,
1398 .setlease = generic_setlease,
1399 .fallocate = gfs2_fallocate,
1400};
1401
1402const struct file_operations gfs2_dir_fops_nolock = {
1403 .iterate_shared = gfs2_readdir,
1404 .unlocked_ioctl = gfs2_ioctl,
1405 .compat_ioctl = gfs2_compat_ioctl,
1406 .open = gfs2_open,
1407 .release = gfs2_release,
1408 .fsync = gfs2_fsync,
1409 .llseek = default_llseek,
1410};
1411
1412