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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 int gfs2_get_flags(struct file *filp, u32 __user *ptr)
140{
141 struct inode *inode = file_inode(filp);
142 struct gfs2_inode *ip = GFS2_I(inode);
143 struct gfs2_holder gh;
144 int i, error;
145 u32 gfsflags, fsflags = 0;
146
147 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
148 error = gfs2_glock_nq(&gh);
149 if (error)
150 goto out_uninit;
151
152 gfsflags = ip->i_diskflags;
153 if (S_ISDIR(inode->i_mode))
154 gfsflags &= ~GFS2_DIF_JDATA;
155 else
156 gfsflags &= ~GFS2_DIF_INHERIT_JDATA;
157 for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++)
158 if (gfsflags & fsflag_gfs2flag[i].gfsflag)
159 fsflags |= fsflag_gfs2flag[i].fsflag;
160
161 if (put_user(fsflags, ptr))
162 error = -EFAULT;
163
164 gfs2_glock_dq(&gh);
165out_uninit:
166 gfs2_holder_uninit(&gh);
167 return error;
168}
169
170void gfs2_set_inode_flags(struct inode *inode)
171{
172 struct gfs2_inode *ip = GFS2_I(inode);
173 unsigned int flags = inode->i_flags;
174
175 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC);
176 if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode))
177 flags |= S_NOSEC;
178 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
179 flags |= S_IMMUTABLE;
180 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
181 flags |= S_APPEND;
182 if (ip->i_diskflags & GFS2_DIF_NOATIME)
183 flags |= S_NOATIME;
184 if (ip->i_diskflags & GFS2_DIF_SYNC)
185 flags |= S_SYNC;
186 inode->i_flags = flags;
187}
188
189
190#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
191 GFS2_DIF_IMMUTABLE| \
192 GFS2_DIF_APPENDONLY| \
193 GFS2_DIF_NOATIME| \
194 GFS2_DIF_SYNC| \
195 GFS2_DIF_TOPDIR| \
196 GFS2_DIF_INHERIT_JDATA)
197
198
199
200
201
202
203
204
205static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
206{
207 struct inode *inode = file_inode(filp);
208 struct gfs2_inode *ip = GFS2_I(inode);
209 struct gfs2_sbd *sdp = GFS2_SB(inode);
210 struct buffer_head *bh;
211 struct gfs2_holder gh;
212 int error;
213 u32 new_flags, flags;
214
215 error = mnt_want_write_file(filp);
216 if (error)
217 return error;
218
219 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
220 if (error)
221 goto out_drop_write;
222
223 error = -EACCES;
224 if (!inode_owner_or_capable(inode))
225 goto out;
226
227 error = 0;
228 flags = ip->i_diskflags;
229 new_flags = (flags & ~mask) | (reqflags & mask);
230 if ((new_flags ^ flags) == 0)
231 goto out;
232
233 error = -EPERM;
234 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
235 goto out;
236 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
237 goto out;
238 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
239 !capable(CAP_LINUX_IMMUTABLE))
240 goto out;
241 if (!IS_IMMUTABLE(inode)) {
242 error = gfs2_permission(inode, MAY_WRITE);
243 if (error)
244 goto out;
245 }
246 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
247 if (new_flags & GFS2_DIF_JDATA)
248 gfs2_log_flush(sdp, ip->i_gl,
249 GFS2_LOG_HEAD_FLUSH_NORMAL |
250 GFS2_LFC_SET_FLAGS);
251 error = filemap_fdatawrite(inode->i_mapping);
252 if (error)
253 goto out;
254 error = filemap_fdatawait(inode->i_mapping);
255 if (error)
256 goto out;
257 if (new_flags & GFS2_DIF_JDATA)
258 gfs2_ordered_del_inode(ip);
259 }
260 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
261 if (error)
262 goto out;
263 error = gfs2_meta_inode_buffer(ip, &bh);
264 if (error)
265 goto out_trans_end;
266 inode->i_ctime = current_time(inode);
267 gfs2_trans_add_meta(ip->i_gl, bh);
268 ip->i_diskflags = new_flags;
269 gfs2_dinode_out(ip, bh->b_data);
270 brelse(bh);
271 gfs2_set_inode_flags(inode);
272 gfs2_set_aops(inode);
273out_trans_end:
274 gfs2_trans_end(sdp);
275out:
276 gfs2_glock_dq_uninit(&gh);
277out_drop_write:
278 mnt_drop_write_file(filp);
279 return error;
280}
281
282static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
283{
284 struct inode *inode = file_inode(filp);
285 u32 fsflags, gfsflags = 0;
286 u32 mask;
287 int i;
288
289 if (get_user(fsflags, ptr))
290 return -EFAULT;
291
292 for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) {
293 if (fsflags & fsflag_gfs2flag[i].fsflag) {
294 fsflags &= ~fsflag_gfs2flag[i].fsflag;
295 gfsflags |= fsflag_gfs2flag[i].gfsflag;
296 }
297 }
298 if (fsflags || gfsflags & ~GFS2_FLAGS_USER_SET)
299 return -EINVAL;
300
301 mask = GFS2_FLAGS_USER_SET;
302 if (S_ISDIR(inode->i_mode)) {
303 mask &= ~GFS2_DIF_JDATA;
304 } else {
305
306 if (gfsflags & GFS2_DIF_TOPDIR)
307 return -EINVAL;
308 mask &= ~(GFS2_DIF_TOPDIR | GFS2_DIF_INHERIT_JDATA);
309 }
310
311 return do_gfs2_set_flags(filp, gfsflags, mask);
312}
313
314static int gfs2_getlabel(struct file *filp, char __user *label)
315{
316 struct inode *inode = file_inode(filp);
317 struct gfs2_sbd *sdp = GFS2_SB(inode);
318
319 if (copy_to_user(label, sdp->sd_sb.sb_locktable, GFS2_LOCKNAME_LEN))
320 return -EFAULT;
321
322 return 0;
323}
324
325static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
326{
327 switch(cmd) {
328 case FS_IOC_GETFLAGS:
329 return gfs2_get_flags(filp, (u32 __user *)arg);
330 case FS_IOC_SETFLAGS:
331 return gfs2_set_flags(filp, (u32 __user *)arg);
332 case FITRIM:
333 return gfs2_fitrim(filp, (void __user *)arg);
334 case FS_IOC_GETFSLABEL:
335 return gfs2_getlabel(filp, (char __user *)arg);
336 }
337
338 return -ENOTTY;
339}
340
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350
351
352
353static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size)
354{
355 struct inode *inode = file_inode(filep);
356 struct gfs2_sbd *sdp = GFS2_SB(inode);
357 struct gfs2_inode *ip = GFS2_I(inode);
358 size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift;
359 int hint = min_t(size_t, INT_MAX, blks);
360
361 if (hint > atomic_read(&ip->i_sizehint))
362 atomic_set(&ip->i_sizehint, hint);
363}
364
365
366
367
368
369
370
371
372
373
374
375static int gfs2_allocate_page_backing(struct page *page)
376{
377 struct inode *inode = page->mapping->host;
378 struct buffer_head bh;
379 unsigned long size = PAGE_SIZE;
380 u64 lblock = page->index << (PAGE_SHIFT - inode->i_blkbits);
381
382 do {
383 bh.b_state = 0;
384 bh.b_size = size;
385 gfs2_block_map(inode, lblock, &bh, 1);
386 if (!buffer_mapped(&bh))
387 return -EIO;
388 size -= bh.b_size;
389 lblock += (bh.b_size >> inode->i_blkbits);
390 } while(size > 0);
391 return 0;
392}
393
394
395
396
397
398
399
400
401
402
403static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
404{
405 struct page *page = vmf->page;
406 struct inode *inode = file_inode(vmf->vma->vm_file);
407 struct gfs2_inode *ip = GFS2_I(inode);
408 struct gfs2_sbd *sdp = GFS2_SB(inode);
409 struct gfs2_alloc_parms ap = { .aflags = 0, };
410 unsigned long last_index;
411 u64 pos = page->index << PAGE_SHIFT;
412 unsigned int data_blocks, ind_blocks, rblocks;
413 struct gfs2_holder gh;
414 loff_t size;
415 int ret;
416
417 sb_start_pagefault(inode->i_sb);
418
419 ret = gfs2_rsqa_alloc(ip);
420 if (ret)
421 goto out;
422
423 gfs2_size_hint(vmf->vma->vm_file, pos, PAGE_SIZE);
424
425 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
426 ret = gfs2_glock_nq(&gh);
427 if (ret)
428 goto out_uninit;
429
430
431 file_update_time(vmf->vma->vm_file);
432
433 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
434 set_bit(GIF_SW_PAGED, &ip->i_flags);
435
436 if (!gfs2_write_alloc_required(ip, pos, PAGE_SIZE)) {
437 lock_page(page);
438 if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
439 ret = -EAGAIN;
440 unlock_page(page);
441 }
442 goto out_unlock;
443 }
444
445 ret = gfs2_rindex_update(sdp);
446 if (ret)
447 goto out_unlock;
448
449 gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
450 ap.target = data_blocks + ind_blocks;
451 ret = gfs2_quota_lock_check(ip, &ap);
452 if (ret)
453 goto out_unlock;
454 ret = gfs2_inplace_reserve(ip, &ap);
455 if (ret)
456 goto out_quota_unlock;
457
458 rblocks = RES_DINODE + ind_blocks;
459 if (gfs2_is_jdata(ip))
460 rblocks += data_blocks ? data_blocks : 1;
461 if (ind_blocks || data_blocks) {
462 rblocks += RES_STATFS + RES_QUOTA;
463 rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
464 }
465 ret = gfs2_trans_begin(sdp, rblocks, 0);
466 if (ret)
467 goto out_trans_fail;
468
469 lock_page(page);
470 ret = -EINVAL;
471 size = i_size_read(inode);
472 last_index = (size - 1) >> PAGE_SHIFT;
473
474 if (size == 0 || (page->index > last_index))
475 goto out_trans_end;
476
477 ret = -EAGAIN;
478
479
480
481 if (!PageUptodate(page) || page->mapping != inode->i_mapping)
482 goto out_trans_end;
483
484
485 ret = 0;
486 if (gfs2_is_stuffed(ip))
487 ret = gfs2_unstuff_dinode(ip, page);
488 if (ret == 0)
489 ret = gfs2_allocate_page_backing(page);
490
491out_trans_end:
492 if (ret)
493 unlock_page(page);
494 gfs2_trans_end(sdp);
495out_trans_fail:
496 gfs2_inplace_release(ip);
497out_quota_unlock:
498 gfs2_quota_unlock(ip);
499out_unlock:
500 gfs2_glock_dq(&gh);
501out_uninit:
502 gfs2_holder_uninit(&gh);
503 if (ret == 0) {
504 set_page_dirty(page);
505 wait_for_stable_page(page);
506 }
507out:
508 sb_end_pagefault(inode->i_sb);
509 return block_page_mkwrite_return(ret);
510}
511
512static const struct vm_operations_struct gfs2_vm_ops = {
513 .fault = filemap_fault,
514 .map_pages = filemap_map_pages,
515 .page_mkwrite = gfs2_page_mkwrite,
516};
517
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527
528
529
530static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
531{
532 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
533
534 if (!(file->f_flags & O_NOATIME) &&
535 !IS_NOATIME(&ip->i_inode)) {
536 struct gfs2_holder i_gh;
537 int error;
538
539 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
540 &i_gh);
541 if (error)
542 return error;
543
544 gfs2_glock_dq_uninit(&i_gh);
545 file_accessed(file);
546 }
547 vma->vm_ops = &gfs2_vm_ops;
548
549 return 0;
550}
551
552
553
554
555
556
557
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559
560
561
562
563
564
565int gfs2_open_common(struct inode *inode, struct file *file)
566{
567 struct gfs2_file *fp;
568 int ret;
569
570 if (S_ISREG(inode->i_mode)) {
571 ret = generic_file_open(inode, file);
572 if (ret)
573 return ret;
574 }
575
576 fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS);
577 if (!fp)
578 return -ENOMEM;
579
580 mutex_init(&fp->f_fl_mutex);
581
582 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
583 file->private_data = fp;
584 return 0;
585}
586
587
588
589
590
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597
598
599
600
601static int gfs2_open(struct inode *inode, struct file *file)
602{
603 struct gfs2_inode *ip = GFS2_I(inode);
604 struct gfs2_holder i_gh;
605 int error;
606 bool need_unlock = false;
607
608 if (S_ISREG(ip->i_inode.i_mode)) {
609 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
610 &i_gh);
611 if (error)
612 return error;
613 need_unlock = true;
614 }
615
616 error = gfs2_open_common(inode, file);
617
618 if (need_unlock)
619 gfs2_glock_dq_uninit(&i_gh);
620
621 return error;
622}
623
624
625
626
627
628
629
630
631
632static int gfs2_release(struct inode *inode, struct file *file)
633{
634 struct gfs2_inode *ip = GFS2_I(inode);
635
636 kfree(file->private_data);
637 file->private_data = NULL;
638
639 if (!(file->f_mode & FMODE_WRITE))
640 return 0;
641
642 gfs2_rsqa_delete(ip, &inode->i_writecount);
643 return 0;
644}
645
646
647
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650
651
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654
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657
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663
664
665
666
667static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
668 int datasync)
669{
670 struct address_space *mapping = file->f_mapping;
671 struct inode *inode = mapping->host;
672 int sync_state = inode->i_state & I_DIRTY_ALL;
673 struct gfs2_inode *ip = GFS2_I(inode);
674 int ret = 0, ret1 = 0;
675
676 if (mapping->nrpages) {
677 ret1 = filemap_fdatawrite_range(mapping, start, end);
678 if (ret1 == -EIO)
679 return ret1;
680 }
681
682 if (!gfs2_is_jdata(ip))
683 sync_state &= ~I_DIRTY_PAGES;
684 if (datasync)
685 sync_state &= ~(I_DIRTY_SYNC | I_DIRTY_TIME);
686
687 if (sync_state) {
688 ret = sync_inode_metadata(inode, 1);
689 if (ret)
690 return ret;
691 if (gfs2_is_jdata(ip))
692 ret = file_write_and_wait(file);
693 if (ret)
694 return ret;
695 gfs2_ail_flush(ip->i_gl, 1);
696 }
697
698 if (mapping->nrpages)
699 ret = file_fdatawait_range(file, start, end);
700
701 return ret ? ret : ret1;
702}
703
704static ssize_t gfs2_file_direct_read(struct kiocb *iocb, struct iov_iter *to)
705{
706 struct file *file = iocb->ki_filp;
707 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
708 size_t count = iov_iter_count(to);
709 struct gfs2_holder gh;
710 ssize_t ret;
711
712 if (!count)
713 return 0;
714
715 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
716 ret = gfs2_glock_nq(&gh);
717 if (ret)
718 goto out_uninit;
719
720 ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL);
721
722 gfs2_glock_dq(&gh);
723out_uninit:
724 gfs2_holder_uninit(&gh);
725 return ret;
726}
727
728static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
729{
730 struct file *file = iocb->ki_filp;
731 struct inode *inode = file->f_mapping->host;
732 struct gfs2_inode *ip = GFS2_I(inode);
733 size_t len = iov_iter_count(from);
734 loff_t offset = iocb->ki_pos;
735 struct gfs2_holder gh;
736 ssize_t ret;
737
738
739
740
741
742
743
744
745
746 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
747 ret = gfs2_glock_nq(&gh);
748 if (ret)
749 goto out_uninit;
750
751
752 if (offset + len > i_size_read(&ip->i_inode))
753 goto out;
754
755 ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL);
756
757out:
758 gfs2_glock_dq(&gh);
759out_uninit:
760 gfs2_holder_uninit(&gh);
761 return ret;
762}
763
764static ssize_t gfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
765{
766 ssize_t ret;
767
768 if (iocb->ki_flags & IOCB_DIRECT) {
769 ret = gfs2_file_direct_read(iocb, to);
770 if (likely(ret != -ENOTBLK))
771 return ret;
772 iocb->ki_flags &= ~IOCB_DIRECT;
773 }
774 return generic_file_read_iter(iocb, to);
775}
776
777
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784
785
786
787
788
789static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
790{
791 struct file *file = iocb->ki_filp;
792 struct inode *inode = file_inode(file);
793 struct gfs2_inode *ip = GFS2_I(inode);
794 ssize_t written = 0, ret;
795
796 ret = gfs2_rsqa_alloc(ip);
797 if (ret)
798 return ret;
799
800 gfs2_size_hint(file, iocb->ki_pos, iov_iter_count(from));
801
802 if (iocb->ki_flags & IOCB_APPEND) {
803 struct gfs2_holder gh;
804
805 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
806 if (ret)
807 return ret;
808 gfs2_glock_dq_uninit(&gh);
809 }
810
811 inode_lock(inode);
812 ret = generic_write_checks(iocb, from);
813 if (ret <= 0)
814 goto out;
815
816
817 current->backing_dev_info = inode_to_bdi(inode);
818
819 ret = file_remove_privs(file);
820 if (ret)
821 goto out2;
822
823 ret = file_update_time(file);
824 if (ret)
825 goto out2;
826
827 if (iocb->ki_flags & IOCB_DIRECT) {
828 struct address_space *mapping = file->f_mapping;
829 loff_t pos, endbyte;
830 ssize_t buffered;
831
832 written = gfs2_file_direct_write(iocb, from);
833 if (written < 0 || !iov_iter_count(from))
834 goto out2;
835
836 ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
837 if (unlikely(ret < 0))
838 goto out2;
839 buffered = ret;
840
841
842
843
844
845
846 pos = iocb->ki_pos;
847 endbyte = pos + buffered - 1;
848 ret = filemap_write_and_wait_range(mapping, pos, endbyte);
849 if (!ret) {
850 iocb->ki_pos += buffered;
851 written += buffered;
852 invalidate_mapping_pages(mapping,
853 pos >> PAGE_SHIFT,
854 endbyte >> PAGE_SHIFT);
855 } else {
856
857
858
859
860 }
861 } else {
862 ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
863 if (likely(ret > 0))
864 iocb->ki_pos += ret;
865 }
866
867out2:
868 current->backing_dev_info = NULL;
869out:
870 inode_unlock(inode);
871 if (likely(ret > 0)) {
872
873 ret = generic_write_sync(iocb, ret);
874 }
875 return written ? written : ret;
876}
877
878static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
879 int mode)
880{
881 struct super_block *sb = inode->i_sb;
882 struct gfs2_inode *ip = GFS2_I(inode);
883 loff_t end = offset + len;
884 struct buffer_head *dibh;
885 int error;
886
887 error = gfs2_meta_inode_buffer(ip, &dibh);
888 if (unlikely(error))
889 return error;
890
891 gfs2_trans_add_meta(ip->i_gl, dibh);
892
893 if (gfs2_is_stuffed(ip)) {
894 error = gfs2_unstuff_dinode(ip, NULL);
895 if (unlikely(error))
896 goto out;
897 }
898
899 while (offset < end) {
900 struct iomap iomap = { };
901
902 error = gfs2_iomap_get_alloc(inode, offset, end - offset,
903 &iomap);
904 if (error)
905 goto out;
906 offset = iomap.offset + iomap.length;
907 if (!(iomap.flags & IOMAP_F_NEW))
908 continue;
909 error = sb_issue_zeroout(sb, iomap.addr >> inode->i_blkbits,
910 iomap.length >> inode->i_blkbits,
911 GFP_NOFS);
912 if (error) {
913 fs_err(GFS2_SB(inode), "Failed to zero data buffers\n");
914 goto out;
915 }
916 }
917out:
918 brelse(dibh);
919 return error;
920}
921
922
923
924
925
926
927
928
929
930
931
932static void calc_max_reserv(struct gfs2_inode *ip, loff_t *len,
933 unsigned int *data_blocks, unsigned int *ind_blocks,
934 unsigned int max_blocks)
935{
936 loff_t max = *len;
937 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
938 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
939
940 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
941 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
942 max_data -= tmp;
943 }
944
945 *data_blocks = max_data;
946 *ind_blocks = max_blocks - max_data;
947 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
948 if (*len > max) {
949 *len = max;
950 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
951 }
952}
953
954static long __gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
955{
956 struct inode *inode = file_inode(file);
957 struct gfs2_sbd *sdp = GFS2_SB(inode);
958 struct gfs2_inode *ip = GFS2_I(inode);
959 struct gfs2_alloc_parms ap = { .aflags = 0, };
960 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
961 loff_t bytes, max_bytes, max_blks;
962 int error;
963 const loff_t pos = offset;
964 const loff_t count = len;
965 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
966 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
967 loff_t max_chunk_size = UINT_MAX & bsize_mask;
968
969 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
970
971 offset &= bsize_mask;
972
973 len = next - offset;
974 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
975 if (!bytes)
976 bytes = UINT_MAX;
977 bytes &= bsize_mask;
978 if (bytes == 0)
979 bytes = sdp->sd_sb.sb_bsize;
980
981 gfs2_size_hint(file, offset, len);
982
983 gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
984 ap.min_target = data_blocks + ind_blocks;
985
986 while (len > 0) {
987 if (len < bytes)
988 bytes = len;
989 if (!gfs2_write_alloc_required(ip, offset, bytes)) {
990 len -= bytes;
991 offset += bytes;
992 continue;
993 }
994
995
996
997
998
999 max_bytes = (len > max_chunk_size) ? max_chunk_size : len;
1000
1001
1002
1003
1004
1005 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
1006 ap.target = data_blocks + ind_blocks;
1007
1008 error = gfs2_quota_lock_check(ip, &ap);
1009 if (error)
1010 return error;
1011
1012
1013 max_blks = UINT_MAX;
1014 if (ap.allowed)
1015 max_blks = ap.allowed;
1016
1017 error = gfs2_inplace_reserve(ip, &ap);
1018 if (error)
1019 goto out_qunlock;
1020
1021
1022 if (ap.allowed && ap.allowed < max_blks)
1023 max_blks = ap.allowed;
1024
1025
1026
1027
1028 calc_max_reserv(ip, &max_bytes, &data_blocks,
1029 &ind_blocks, max_blks);
1030
1031 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
1032 RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks);
1033 if (gfs2_is_jdata(ip))
1034 rblocks += data_blocks ? data_blocks : 1;
1035
1036 error = gfs2_trans_begin(sdp, rblocks,
1037 PAGE_SIZE/sdp->sd_sb.sb_bsize);
1038 if (error)
1039 goto out_trans_fail;
1040
1041 error = fallocate_chunk(inode, offset, max_bytes, mode);
1042 gfs2_trans_end(sdp);
1043
1044 if (error)
1045 goto out_trans_fail;
1046
1047 len -= max_bytes;
1048 offset += max_bytes;
1049 gfs2_inplace_release(ip);
1050 gfs2_quota_unlock(ip);
1051 }
1052
1053 if (!(mode & FALLOC_FL_KEEP_SIZE) && (pos + count) > inode->i_size) {
1054 i_size_write(inode, pos + count);
1055 file_update_time(file);
1056 mark_inode_dirty(inode);
1057 }
1058
1059 if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host))
1060 return vfs_fsync_range(file, pos, pos + count - 1,
1061 (file->f_flags & __O_SYNC) ? 0 : 1);
1062 return 0;
1063
1064out_trans_fail:
1065 gfs2_inplace_release(ip);
1066out_qunlock:
1067 gfs2_quota_unlock(ip);
1068 return error;
1069}
1070
1071static long gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
1072{
1073 struct inode *inode = file_inode(file);
1074 struct gfs2_sbd *sdp = GFS2_SB(inode);
1075 struct gfs2_inode *ip = GFS2_I(inode);
1076 struct gfs2_holder gh;
1077 int ret;
1078
1079 if (mode & ~(FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE))
1080 return -EOPNOTSUPP;
1081
1082 if (gfs2_is_jdata(ip) && inode != sdp->sd_rindex)
1083 return -EOPNOTSUPP;
1084
1085 inode_lock(inode);
1086
1087 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1088 ret = gfs2_glock_nq(&gh);
1089 if (ret)
1090 goto out_uninit;
1091
1092 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
1093 (offset + len) > inode->i_size) {
1094 ret = inode_newsize_ok(inode, offset + len);
1095 if (ret)
1096 goto out_unlock;
1097 }
1098
1099 ret = get_write_access(inode);
1100 if (ret)
1101 goto out_unlock;
1102
1103 if (mode & FALLOC_FL_PUNCH_HOLE) {
1104 ret = __gfs2_punch_hole(file, offset, len);
1105 } else {
1106 ret = gfs2_rsqa_alloc(ip);
1107 if (ret)
1108 goto out_putw;
1109
1110 ret = __gfs2_fallocate(file, mode, offset, len);
1111
1112 if (ret)
1113 gfs2_rs_deltree(&ip->i_res);
1114 }
1115
1116out_putw:
1117 put_write_access(inode);
1118out_unlock:
1119 gfs2_glock_dq(&gh);
1120out_uninit:
1121 gfs2_holder_uninit(&gh);
1122 inode_unlock(inode);
1123 return ret;
1124}
1125
1126static ssize_t gfs2_file_splice_write(struct pipe_inode_info *pipe,
1127 struct file *out, loff_t *ppos,
1128 size_t len, unsigned int flags)
1129{
1130 int error;
1131 struct gfs2_inode *ip = GFS2_I(out->f_mapping->host);
1132
1133 error = gfs2_rsqa_alloc(ip);
1134 if (error)
1135 return (ssize_t)error;
1136
1137 gfs2_size_hint(out, *ppos, len);
1138
1139 return iter_file_splice_write(pipe, out, ppos, len, flags);
1140}
1141
1142#ifdef CONFIG_GFS2_FS_LOCKING_DLM
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
1154{
1155 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
1156 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
1157 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1158
1159 if (!(fl->fl_flags & FL_POSIX))
1160 return -ENOLCK;
1161 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
1162 return -ENOLCK;
1163
1164 if (cmd == F_CANCELLK) {
1165
1166 cmd = F_SETLK;
1167 fl->fl_type = F_UNLCK;
1168 }
1169 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) {
1170 if (fl->fl_type == F_UNLCK)
1171 locks_lock_file_wait(file, fl);
1172 return -EIO;
1173 }
1174 if (IS_GETLK(cmd))
1175 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
1176 else if (fl->fl_type == F_UNLCK)
1177 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
1178 else
1179 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
1180}
1181
1182static int do_flock(struct file *file, int cmd, struct file_lock *fl)
1183{
1184 struct gfs2_file *fp = file->private_data;
1185 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1186 struct gfs2_inode *ip = GFS2_I(file_inode(file));
1187 struct gfs2_glock *gl;
1188 unsigned int state;
1189 u16 flags;
1190 int error = 0;
1191 int sleeptime;
1192
1193 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
1194 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY_1CB) | GL_EXACT;
1195
1196 mutex_lock(&fp->f_fl_mutex);
1197
1198 if (gfs2_holder_initialized(fl_gh)) {
1199 struct file_lock request;
1200 if (fl_gh->gh_state == state)
1201 goto out;
1202 locks_init_lock(&request);
1203 request.fl_type = F_UNLCK;
1204 request.fl_flags = FL_FLOCK;
1205 locks_lock_file_wait(file, &request);
1206 gfs2_glock_dq(fl_gh);
1207 gfs2_holder_reinit(state, flags, fl_gh);
1208 } else {
1209 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
1210 &gfs2_flock_glops, CREATE, &gl);
1211 if (error)
1212 goto out;
1213 gfs2_holder_init(gl, state, flags, fl_gh);
1214 gfs2_glock_put(gl);
1215 }
1216 for (sleeptime = 1; sleeptime <= 4; sleeptime <<= 1) {
1217 error = gfs2_glock_nq(fl_gh);
1218 if (error != GLR_TRYFAILED)
1219 break;
1220 fl_gh->gh_flags = LM_FLAG_TRY | GL_EXACT;
1221 fl_gh->gh_error = 0;
1222 msleep(sleeptime);
1223 }
1224 if (error) {
1225 gfs2_holder_uninit(fl_gh);
1226 if (error == GLR_TRYFAILED)
1227 error = -EAGAIN;
1228 } else {
1229 error = locks_lock_file_wait(file, fl);
1230 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1231 }
1232
1233out:
1234 mutex_unlock(&fp->f_fl_mutex);
1235 return error;
1236}
1237
1238static void do_unflock(struct file *file, struct file_lock *fl)
1239{
1240 struct gfs2_file *fp = file->private_data;
1241 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1242
1243 mutex_lock(&fp->f_fl_mutex);
1244 locks_lock_file_wait(file, fl);
1245 if (gfs2_holder_initialized(fl_gh)) {
1246 gfs2_glock_dq(fl_gh);
1247 gfs2_holder_uninit(fl_gh);
1248 }
1249 mutex_unlock(&fp->f_fl_mutex);
1250}
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
1262{
1263 if (!(fl->fl_flags & FL_FLOCK))
1264 return -ENOLCK;
1265 if (fl->fl_type & LOCK_MAND)
1266 return -EOPNOTSUPP;
1267
1268 if (fl->fl_type == F_UNLCK) {
1269 do_unflock(file, fl);
1270 return 0;
1271 } else {
1272 return do_flock(file, cmd, fl);
1273 }
1274}
1275
1276const struct file_operations gfs2_file_fops = {
1277 .llseek = gfs2_llseek,
1278 .read_iter = gfs2_file_read_iter,
1279 .write_iter = gfs2_file_write_iter,
1280 .iopoll = iomap_dio_iopoll,
1281 .unlocked_ioctl = gfs2_ioctl,
1282 .mmap = gfs2_mmap,
1283 .open = gfs2_open,
1284 .release = gfs2_release,
1285 .fsync = gfs2_fsync,
1286 .lock = gfs2_lock,
1287 .flock = gfs2_flock,
1288 .splice_read = generic_file_splice_read,
1289 .splice_write = gfs2_file_splice_write,
1290 .setlease = simple_nosetlease,
1291 .fallocate = gfs2_fallocate,
1292};
1293
1294const struct file_operations gfs2_dir_fops = {
1295 .iterate_shared = gfs2_readdir,
1296 .unlocked_ioctl = gfs2_ioctl,
1297 .open = gfs2_open,
1298 .release = gfs2_release,
1299 .fsync = gfs2_fsync,
1300 .lock = gfs2_lock,
1301 .flock = gfs2_flock,
1302 .llseek = default_llseek,
1303};
1304
1305#endif
1306
1307const struct file_operations gfs2_file_fops_nolock = {
1308 .llseek = gfs2_llseek,
1309 .read_iter = gfs2_file_read_iter,
1310 .write_iter = gfs2_file_write_iter,
1311 .iopoll = iomap_dio_iopoll,
1312 .unlocked_ioctl = gfs2_ioctl,
1313 .mmap = gfs2_mmap,
1314 .open = gfs2_open,
1315 .release = gfs2_release,
1316 .fsync = gfs2_fsync,
1317 .splice_read = generic_file_splice_read,
1318 .splice_write = gfs2_file_splice_write,
1319 .setlease = generic_setlease,
1320 .fallocate = gfs2_fallocate,
1321};
1322
1323const struct file_operations gfs2_dir_fops_nolock = {
1324 .iterate_shared = gfs2_readdir,
1325 .unlocked_ioctl = gfs2_ioctl,
1326 .open = gfs2_open,
1327 .release = gfs2_release,
1328 .fsync = gfs2_fsync,
1329 .llseek = default_llseek,
1330};
1331
1332