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
388
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
438
439
440
441
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 vm_fault_t gfs2_fault(struct vm_fault *vmf)
562{
563 struct inode *inode = file_inode(vmf->vma->vm_file);
564 struct gfs2_inode *ip = GFS2_I(inode);
565 struct gfs2_holder gh;
566 vm_fault_t ret;
567 int err;
568
569 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
570 err = gfs2_glock_nq(&gh);
571 if (err) {
572 ret = block_page_mkwrite_return(err);
573 goto out_uninit;
574 }
575 ret = filemap_fault(vmf);
576 gfs2_glock_dq(&gh);
577out_uninit:
578 gfs2_holder_uninit(&gh);
579 return ret;
580}
581
582static const struct vm_operations_struct gfs2_vm_ops = {
583 .fault = gfs2_fault,
584 .map_pages = filemap_map_pages,
585 .page_mkwrite = gfs2_page_mkwrite,
586};
587
588
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590
591
592
593
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595
596
597
598
599
600static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
601{
602 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
603
604 if (!(file->f_flags & O_NOATIME) &&
605 !IS_NOATIME(&ip->i_inode)) {
606 struct gfs2_holder i_gh;
607 int error;
608
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
614 gfs2_glock_dq_uninit(&i_gh);
615 file_accessed(file);
616 }
617 vma->vm_ops = &gfs2_vm_ops;
618
619 return 0;
620}
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635int gfs2_open_common(struct inode *inode, struct file *file)
636{
637 struct gfs2_file *fp;
638 int ret;
639
640 if (S_ISREG(inode->i_mode)) {
641 ret = generic_file_open(inode, file);
642 if (ret)
643 return ret;
644 }
645
646 fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS);
647 if (!fp)
648 return -ENOMEM;
649
650 mutex_init(&fp->f_fl_mutex);
651
652 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
653 file->private_data = fp;
654 if (file->f_mode & FMODE_WRITE) {
655 ret = gfs2_qa_get(GFS2_I(inode));
656 if (ret)
657 goto fail;
658 }
659 return 0;
660
661fail:
662 kfree(file->private_data);
663 file->private_data = NULL;
664 return ret;
665}
666
667
668
669
670
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676
677
678
679
680
681static int gfs2_open(struct inode *inode, struct file *file)
682{
683 struct gfs2_inode *ip = GFS2_I(inode);
684 struct gfs2_holder i_gh;
685 int error;
686 bool need_unlock = false;
687
688 if (S_ISREG(ip->i_inode.i_mode)) {
689 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
690 &i_gh);
691 if (error)
692 return error;
693 need_unlock = true;
694 }
695
696 error = gfs2_open_common(inode, file);
697
698 if (need_unlock)
699 gfs2_glock_dq_uninit(&i_gh);
700
701 return error;
702}
703
704
705
706
707
708
709
710
711
712static int gfs2_release(struct inode *inode, struct file *file)
713{
714 struct gfs2_inode *ip = GFS2_I(inode);
715
716 kfree(file->private_data);
717 file->private_data = NULL;
718
719 if (file->f_mode & FMODE_WRITE) {
720 gfs2_rs_delete(ip, &inode->i_writecount);
721 gfs2_qa_put(ip);
722 }
723 return 0;
724}
725
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746
747static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
748 int datasync)
749{
750 struct address_space *mapping = file->f_mapping;
751 struct inode *inode = mapping->host;
752 int sync_state = inode->i_state & I_DIRTY_ALL;
753 struct gfs2_inode *ip = GFS2_I(inode);
754 int ret = 0, ret1 = 0;
755
756 if (mapping->nrpages) {
757 ret1 = filemap_fdatawrite_range(mapping, start, end);
758 if (ret1 == -EIO)
759 return ret1;
760 }
761
762 if (!gfs2_is_jdata(ip))
763 sync_state &= ~I_DIRTY_PAGES;
764 if (datasync)
765 sync_state &= ~(I_DIRTY_SYNC | I_DIRTY_TIME);
766
767 if (sync_state) {
768 ret = sync_inode_metadata(inode, 1);
769 if (ret)
770 return ret;
771 if (gfs2_is_jdata(ip))
772 ret = file_write_and_wait(file);
773 if (ret)
774 return ret;
775 gfs2_ail_flush(ip->i_gl, 1);
776 }
777
778 if (mapping->nrpages)
779 ret = file_fdatawait_range(file, start, end);
780
781 return ret ? ret : ret1;
782}
783
784static ssize_t gfs2_file_direct_read(struct kiocb *iocb, struct iov_iter *to,
785 struct gfs2_holder *gh)
786{
787 struct file *file = iocb->ki_filp;
788 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
789 size_t count = iov_iter_count(to);
790 ssize_t ret;
791
792 if (!count)
793 return 0;
794
795 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, gh);
796 ret = gfs2_glock_nq(gh);
797 if (ret)
798 goto out_uninit;
799
800 ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL,
801 is_sync_kiocb(iocb));
802
803 gfs2_glock_dq(gh);
804out_uninit:
805 gfs2_holder_uninit(gh);
806 return ret;
807}
808
809static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from,
810 struct gfs2_holder *gh)
811{
812 struct file *file = iocb->ki_filp;
813 struct inode *inode = file->f_mapping->host;
814 struct gfs2_inode *ip = GFS2_I(inode);
815 size_t len = iov_iter_count(from);
816 loff_t offset = iocb->ki_pos;
817 ssize_t ret;
818
819
820
821
822
823
824
825
826
827 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, gh);
828 ret = gfs2_glock_nq(gh);
829 if (ret)
830 goto out_uninit;
831
832
833 if (offset + len > i_size_read(&ip->i_inode))
834 goto out;
835
836 ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL,
837 is_sync_kiocb(iocb));
838 if (ret == -ENOTBLK)
839 ret = 0;
840out:
841 gfs2_glock_dq(gh);
842out_uninit:
843 gfs2_holder_uninit(gh);
844 return ret;
845}
846
847static ssize_t gfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
848{
849 struct gfs2_inode *ip;
850 struct gfs2_holder gh;
851 size_t written = 0;
852 ssize_t ret;
853
854 if (iocb->ki_flags & IOCB_DIRECT) {
855 ret = gfs2_file_direct_read(iocb, to, &gh);
856 if (likely(ret != -ENOTBLK))
857 return ret;
858 iocb->ki_flags &= ~IOCB_DIRECT;
859 }
860 iocb->ki_flags |= IOCB_NOIO;
861 ret = generic_file_read_iter(iocb, to);
862 iocb->ki_flags &= ~IOCB_NOIO;
863 if (ret >= 0) {
864 if (!iov_iter_count(to))
865 return ret;
866 written = ret;
867 } else {
868 if (ret != -EAGAIN)
869 return ret;
870 if (iocb->ki_flags & IOCB_NOWAIT)
871 return ret;
872 }
873 ip = GFS2_I(iocb->ki_filp->f_mapping->host);
874 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
875 ret = gfs2_glock_nq(&gh);
876 if (ret)
877 goto out_uninit;
878 ret = generic_file_read_iter(iocb, to);
879 if (ret > 0)
880 written += ret;
881 gfs2_glock_dq(&gh);
882out_uninit:
883 gfs2_holder_uninit(&gh);
884 return written ? written : ret;
885}
886
887
888
889
890
891
892
893
894
895
896
897
898
899static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
900{
901 struct file *file = iocb->ki_filp;
902 struct inode *inode = file_inode(file);
903 struct gfs2_inode *ip = GFS2_I(inode);
904 struct gfs2_holder gh;
905 ssize_t ret;
906
907 gfs2_size_hint(file, iocb->ki_pos, iov_iter_count(from));
908
909 if (iocb->ki_flags & IOCB_APPEND) {
910 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
911 if (ret)
912 return ret;
913 gfs2_glock_dq_uninit(&gh);
914 }
915
916 inode_lock(inode);
917 ret = generic_write_checks(iocb, from);
918 if (ret <= 0)
919 goto out_unlock;
920
921 ret = file_remove_privs(file);
922 if (ret)
923 goto out_unlock;
924
925 ret = file_update_time(file);
926 if (ret)
927 goto out_unlock;
928
929 if (iocb->ki_flags & IOCB_DIRECT) {
930 struct address_space *mapping = file->f_mapping;
931 ssize_t buffered, ret2;
932
933 ret = gfs2_file_direct_write(iocb, from, &gh);
934 if (ret < 0 || !iov_iter_count(from))
935 goto out_unlock;
936
937 iocb->ki_flags |= IOCB_DSYNC;
938 current->backing_dev_info = inode_to_bdi(inode);
939 buffered = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
940 current->backing_dev_info = NULL;
941 if (unlikely(buffered <= 0))
942 goto out_unlock;
943
944
945
946
947
948
949
950
951 iocb->ki_pos += buffered;
952 ret2 = generic_write_sync(iocb, buffered);
953 invalidate_mapping_pages(mapping,
954 (iocb->ki_pos - buffered) >> PAGE_SHIFT,
955 (iocb->ki_pos - 1) >> PAGE_SHIFT);
956 if (!ret || ret2 > 0)
957 ret += ret2;
958 } else {
959 current->backing_dev_info = inode_to_bdi(inode);
960 ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
961 current->backing_dev_info = NULL;
962 if (likely(ret > 0)) {
963 iocb->ki_pos += ret;
964 ret = generic_write_sync(iocb, ret);
965 }
966 }
967
968out_unlock:
969 inode_unlock(inode);
970 return ret;
971}
972
973static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
974 int mode)
975{
976 struct super_block *sb = inode->i_sb;
977 struct gfs2_inode *ip = GFS2_I(inode);
978 loff_t end = offset + len;
979 struct buffer_head *dibh;
980 int error;
981
982 error = gfs2_meta_inode_buffer(ip, &dibh);
983 if (unlikely(error))
984 return error;
985
986 gfs2_trans_add_meta(ip->i_gl, dibh);
987
988 if (gfs2_is_stuffed(ip)) {
989 error = gfs2_unstuff_dinode(ip, NULL);
990 if (unlikely(error))
991 goto out;
992 }
993
994 while (offset < end) {
995 struct iomap iomap = { };
996
997 error = gfs2_iomap_get_alloc(inode, offset, end - offset,
998 &iomap);
999 if (error)
1000 goto out;
1001 offset = iomap.offset + iomap.length;
1002 if (!(iomap.flags & IOMAP_F_NEW))
1003 continue;
1004 error = sb_issue_zeroout(sb, iomap.addr >> inode->i_blkbits,
1005 iomap.length >> inode->i_blkbits,
1006 GFP_NOFS);
1007 if (error) {
1008 fs_err(GFS2_SB(inode), "Failed to zero data buffers\n");
1009 goto out;
1010 }
1011 }
1012out:
1013 brelse(dibh);
1014 return error;
1015}
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028static void calc_max_reserv(struct gfs2_inode *ip, loff_t *len,
1029 unsigned int *data_blocks, unsigned int *ind_blocks,
1030 unsigned int max_blocks)
1031{
1032 loff_t max = *len;
1033 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1034 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
1035
1036 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
1037 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
1038 max_data -= tmp;
1039 }
1040
1041 *data_blocks = max_data;
1042 *ind_blocks = max_blocks - max_data;
1043 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
1044 if (*len > max) {
1045 *len = max;
1046 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
1047 }
1048}
1049
1050static long __gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
1051{
1052 struct inode *inode = file_inode(file);
1053 struct gfs2_sbd *sdp = GFS2_SB(inode);
1054 struct gfs2_inode *ip = GFS2_I(inode);
1055 struct gfs2_alloc_parms ap = { .aflags = 0, };
1056 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
1057 loff_t bytes, max_bytes, max_blks;
1058 int error;
1059 const loff_t pos = offset;
1060 const loff_t count = len;
1061 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
1062 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
1063 loff_t max_chunk_size = UINT_MAX & bsize_mask;
1064
1065 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
1066
1067 offset &= bsize_mask;
1068
1069 len = next - offset;
1070 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
1071 if (!bytes)
1072 bytes = UINT_MAX;
1073 bytes &= bsize_mask;
1074 if (bytes == 0)
1075 bytes = sdp->sd_sb.sb_bsize;
1076
1077 gfs2_size_hint(file, offset, len);
1078
1079 gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
1080 ap.min_target = data_blocks + ind_blocks;
1081
1082 while (len > 0) {
1083 if (len < bytes)
1084 bytes = len;
1085 if (!gfs2_write_alloc_required(ip, offset, bytes)) {
1086 len -= bytes;
1087 offset += bytes;
1088 continue;
1089 }
1090
1091
1092
1093
1094
1095 max_bytes = (len > max_chunk_size) ? max_chunk_size : len;
1096
1097
1098
1099
1100
1101 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
1102 ap.target = data_blocks + ind_blocks;
1103
1104 error = gfs2_quota_lock_check(ip, &ap);
1105 if (error)
1106 return error;
1107
1108
1109 max_blks = UINT_MAX;
1110 if (ap.allowed)
1111 max_blks = ap.allowed;
1112
1113 error = gfs2_inplace_reserve(ip, &ap);
1114 if (error)
1115 goto out_qunlock;
1116
1117
1118 if (ap.allowed && ap.allowed < max_blks)
1119 max_blks = ap.allowed;
1120
1121
1122
1123
1124 calc_max_reserv(ip, &max_bytes, &data_blocks,
1125 &ind_blocks, max_blks);
1126
1127 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
1128 RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks);
1129 if (gfs2_is_jdata(ip))
1130 rblocks += data_blocks ? data_blocks : 1;
1131
1132 error = gfs2_trans_begin(sdp, rblocks,
1133 PAGE_SIZE >> inode->i_blkbits);
1134 if (error)
1135 goto out_trans_fail;
1136
1137 error = fallocate_chunk(inode, offset, max_bytes, mode);
1138 gfs2_trans_end(sdp);
1139
1140 if (error)
1141 goto out_trans_fail;
1142
1143 len -= max_bytes;
1144 offset += max_bytes;
1145 gfs2_inplace_release(ip);
1146 gfs2_quota_unlock(ip);
1147 }
1148
1149 if (!(mode & FALLOC_FL_KEEP_SIZE) && (pos + count) > inode->i_size)
1150 i_size_write(inode, pos + count);
1151 file_update_time(file);
1152 mark_inode_dirty(inode);
1153
1154 if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host))
1155 return vfs_fsync_range(file, pos, pos + count - 1,
1156 (file->f_flags & __O_SYNC) ? 0 : 1);
1157 return 0;
1158
1159out_trans_fail:
1160 gfs2_inplace_release(ip);
1161out_qunlock:
1162 gfs2_quota_unlock(ip);
1163 return error;
1164}
1165
1166static long gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
1167{
1168 struct inode *inode = file_inode(file);
1169 struct gfs2_sbd *sdp = GFS2_SB(inode);
1170 struct gfs2_inode *ip = GFS2_I(inode);
1171 struct gfs2_holder gh;
1172 int ret;
1173
1174 if (mode & ~(FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE))
1175 return -EOPNOTSUPP;
1176
1177 if (gfs2_is_jdata(ip) && inode != sdp->sd_rindex)
1178 return -EOPNOTSUPP;
1179
1180 inode_lock(inode);
1181
1182 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1183 ret = gfs2_glock_nq(&gh);
1184 if (ret)
1185 goto out_uninit;
1186
1187 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
1188 (offset + len) > inode->i_size) {
1189 ret = inode_newsize_ok(inode, offset + len);
1190 if (ret)
1191 goto out_unlock;
1192 }
1193
1194 ret = get_write_access(inode);
1195 if (ret)
1196 goto out_unlock;
1197
1198 if (mode & FALLOC_FL_PUNCH_HOLE) {
1199 ret = __gfs2_punch_hole(file, offset, len);
1200 } else {
1201 ret = __gfs2_fallocate(file, mode, offset, len);
1202 if (ret)
1203 gfs2_rs_deltree(&ip->i_res);
1204 }
1205
1206 put_write_access(inode);
1207out_unlock:
1208 gfs2_glock_dq(&gh);
1209out_uninit:
1210 gfs2_holder_uninit(&gh);
1211 inode_unlock(inode);
1212 return ret;
1213}
1214
1215static ssize_t gfs2_file_splice_write(struct pipe_inode_info *pipe,
1216 struct file *out, loff_t *ppos,
1217 size_t len, unsigned int flags)
1218{
1219 ssize_t ret;
1220
1221 gfs2_size_hint(out, *ppos, len);
1222
1223 ret = iter_file_splice_write(pipe, out, ppos, len, flags);
1224 return ret;
1225}
1226
1227#ifdef CONFIG_GFS2_FS_LOCKING_DLM
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
1239{
1240 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
1241 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
1242 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1243
1244 if (!(fl->fl_flags & FL_POSIX))
1245 return -ENOLCK;
1246 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
1247 return -ENOLCK;
1248
1249 if (cmd == F_CANCELLK) {
1250
1251 cmd = F_SETLK;
1252 fl->fl_type = F_UNLCK;
1253 }
1254 if (unlikely(gfs2_withdrawn(sdp))) {
1255 if (fl->fl_type == F_UNLCK)
1256 locks_lock_file_wait(file, fl);
1257 return -EIO;
1258 }
1259 if (IS_GETLK(cmd))
1260 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
1261 else if (fl->fl_type == F_UNLCK)
1262 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
1263 else
1264 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
1265}
1266
1267static int do_flock(struct file *file, int cmd, struct file_lock *fl)
1268{
1269 struct gfs2_file *fp = file->private_data;
1270 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1271 struct gfs2_inode *ip = GFS2_I(file_inode(file));
1272 struct gfs2_glock *gl;
1273 unsigned int state;
1274 u16 flags;
1275 int error = 0;
1276 int sleeptime;
1277
1278 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
1279 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY_1CB) | GL_EXACT;
1280
1281 mutex_lock(&fp->f_fl_mutex);
1282
1283 if (gfs2_holder_initialized(fl_gh)) {
1284 struct file_lock request;
1285 if (fl_gh->gh_state == state)
1286 goto out;
1287 locks_init_lock(&request);
1288 request.fl_type = F_UNLCK;
1289 request.fl_flags = FL_FLOCK;
1290 locks_lock_file_wait(file, &request);
1291 gfs2_glock_dq(fl_gh);
1292 gfs2_holder_reinit(state, flags, fl_gh);
1293 } else {
1294 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
1295 &gfs2_flock_glops, CREATE, &gl);
1296 if (error)
1297 goto out;
1298 gfs2_holder_init(gl, state, flags, fl_gh);
1299 gfs2_glock_put(gl);
1300 }
1301 for (sleeptime = 1; sleeptime <= 4; sleeptime <<= 1) {
1302 error = gfs2_glock_nq(fl_gh);
1303 if (error != GLR_TRYFAILED)
1304 break;
1305 fl_gh->gh_flags = LM_FLAG_TRY | GL_EXACT;
1306 fl_gh->gh_error = 0;
1307 msleep(sleeptime);
1308 }
1309 if (error) {
1310 gfs2_holder_uninit(fl_gh);
1311 if (error == GLR_TRYFAILED)
1312 error = -EAGAIN;
1313 } else {
1314 error = locks_lock_file_wait(file, fl);
1315 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1316 }
1317
1318out:
1319 mutex_unlock(&fp->f_fl_mutex);
1320 return error;
1321}
1322
1323static void do_unflock(struct file *file, struct file_lock *fl)
1324{
1325 struct gfs2_file *fp = file->private_data;
1326 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1327
1328 mutex_lock(&fp->f_fl_mutex);
1329 locks_lock_file_wait(file, fl);
1330 if (gfs2_holder_initialized(fl_gh)) {
1331 gfs2_glock_dq(fl_gh);
1332 gfs2_holder_uninit(fl_gh);
1333 }
1334 mutex_unlock(&fp->f_fl_mutex);
1335}
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
1347{
1348 if (!(fl->fl_flags & FL_FLOCK))
1349 return -ENOLCK;
1350 if (fl->fl_type & LOCK_MAND)
1351 return -EOPNOTSUPP;
1352
1353 if (fl->fl_type == F_UNLCK) {
1354 do_unflock(file, fl);
1355 return 0;
1356 } else {
1357 return do_flock(file, cmd, fl);
1358 }
1359}
1360
1361const struct file_operations gfs2_file_fops = {
1362 .llseek = gfs2_llseek,
1363 .read_iter = gfs2_file_read_iter,
1364 .write_iter = gfs2_file_write_iter,
1365 .iopoll = iomap_dio_iopoll,
1366 .unlocked_ioctl = gfs2_ioctl,
1367 .compat_ioctl = gfs2_compat_ioctl,
1368 .mmap = gfs2_mmap,
1369 .open = gfs2_open,
1370 .release = gfs2_release,
1371 .fsync = gfs2_fsync,
1372 .lock = gfs2_lock,
1373 .flock = gfs2_flock,
1374 .splice_read = generic_file_splice_read,
1375 .splice_write = gfs2_file_splice_write,
1376 .setlease = simple_nosetlease,
1377 .fallocate = gfs2_fallocate,
1378};
1379
1380const struct file_operations gfs2_dir_fops = {
1381 .iterate_shared = gfs2_readdir,
1382 .unlocked_ioctl = gfs2_ioctl,
1383 .compat_ioctl = gfs2_compat_ioctl,
1384 .open = gfs2_open,
1385 .release = gfs2_release,
1386 .fsync = gfs2_fsync,
1387 .lock = gfs2_lock,
1388 .flock = gfs2_flock,
1389 .llseek = default_llseek,
1390};
1391
1392#endif
1393
1394const struct file_operations gfs2_file_fops_nolock = {
1395 .llseek = gfs2_llseek,
1396 .read_iter = gfs2_file_read_iter,
1397 .write_iter = gfs2_file_write_iter,
1398 .iopoll = iomap_dio_iopoll,
1399 .unlocked_ioctl = gfs2_ioctl,
1400 .compat_ioctl = gfs2_compat_ioctl,
1401 .mmap = gfs2_mmap,
1402 .open = gfs2_open,
1403 .release = gfs2_release,
1404 .fsync = gfs2_fsync,
1405 .splice_read = generic_file_splice_read,
1406 .splice_write = gfs2_file_splice_write,
1407 .setlease = generic_setlease,
1408 .fallocate = gfs2_fallocate,
1409};
1410
1411const struct file_operations gfs2_dir_fops_nolock = {
1412 .iterate_shared = gfs2_readdir,
1413 .unlocked_ioctl = gfs2_ioctl,
1414 .compat_ioctl = gfs2_compat_ioctl,
1415 .open = gfs2_open,
1416 .release = gfs2_release,
1417 .fsync = gfs2_fsync,
1418 .llseek = default_llseek,
1419};
1420
1421