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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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 * gfs2_llseek - seek to a location in a file
47 * @file: the file
48 * @offset: the offset
49 * @whence: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
50 *
51 * SEEK_END requires the glock for the file because it references the
52 * file's size.
53 *
54 * Returns: The new offset, or errno
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 * These don't reference inode->i_size and don't depend on the
85 * block mapping, so we don't need the glock.
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 * gfs2_readdir - Iterator for a directory
98 * @file: The directory to read from
99 * @ctx: What to feed directory entries to
100 *
101 * Returns: errno
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 * struct fsflag_gfs2flag
124 *
125 * The FS_JOURNAL_DATA_FL flag maps to GFS2_DIF_INHERIT_JDATA for directories,
126 * and to GFS2_DIF_JDATA for non-directories.
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/* Flags that can be set by user space */
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 * do_gfs2_set_flags - set flags on an inode
213 * @inode: The inode
214 * @reqflags: The flags to set
215 * @mask: Indicates which flags are valid
216 *
217 */
218static int do_gfs2_set_flags(struct inode *inode, u32 reqflags, u32 mask)
219{
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;
226
227 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
228 if (error)
229 return error;
230
231 error = 0;
232 flags = ip->i_diskflags;
233 new_flags = (flags & ~mask) | (reqflags & mask);
234 if ((new_flags ^ flags) == 0)
235 goto out;
236
237 if (!IS_IMMUTABLE(inode)) {
238 error = gfs2_permission(&init_user_ns, inode, MAY_WRITE);
239 if (error)
240 goto out;
241 }
242 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
243 if (new_flags & GFS2_DIF_JDATA)
244 gfs2_log_flush(sdp, ip->i_gl,
245 GFS2_LOG_HEAD_FLUSH_NORMAL |
246 GFS2_LFC_SET_FLAGS);
247 error = filemap_fdatawrite(inode->i_mapping);
248 if (error)
249 goto out;
250 error = filemap_fdatawait(inode->i_mapping);
251 if (error)
252 goto out;
253 if (new_flags & GFS2_DIF_JDATA)
254 gfs2_ordered_del_inode(ip);
255 }
256 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
257 if (error)
258 goto out;
259 error = gfs2_meta_inode_buffer(ip, &bh);
260 if (error)
261 goto out_trans_end;
262 inode->i_ctime = current_time(inode);
263 gfs2_trans_add_meta(ip->i_gl, bh);
264 ip->i_diskflags = new_flags;
265 gfs2_dinode_out(ip, bh->b_data);
266 brelse(bh);
267 gfs2_set_inode_flags(inode);
268 gfs2_set_aops(inode);
269out_trans_end:
270 gfs2_trans_end(sdp);
271out:
272 gfs2_glock_dq_uninit(&gh);
273 return error;
274}
275
276int gfs2_fileattr_set(struct user_namespace *mnt_userns,
277 struct dentry *dentry, struct fileattr *fa)
278{
279 struct inode *inode = d_inode(dentry);
280 u32 fsflags = fa->flags, gfsflags = 0;
281 u32 mask;
282 int i;
283
284 if (d_is_special(dentry))
285 return -ENOTTY;
286
287 if (fileattr_has_fsx(fa))
288 return -EOPNOTSUPP;
289
290 for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) {
291 if (fsflags & fsflag_gfs2flag[i].fsflag) {
292 fsflags &= ~fsflag_gfs2flag[i].fsflag;
293 gfsflags |= fsflag_gfs2flag[i].gfsflag;
294 }
295 }
296 if (fsflags || gfsflags & ~GFS2_FLAGS_USER_SET)
297 return -EINVAL;
298
299 mask = GFS2_FLAGS_USER_SET;
300 if (S_ISDIR(inode->i_mode)) {
301 mask &= ~GFS2_DIF_JDATA;
302 } else {
303 /* The GFS2_DIF_TOPDIR flag is only valid for directories. */
304 if (gfsflags & GFS2_DIF_TOPDIR)
305 return -EINVAL;
306 mask &= ~(GFS2_DIF_TOPDIR | GFS2_DIF_INHERIT_JDATA);
307 }
308
309 return do_gfs2_set_flags(inode, gfsflags, mask);
310}
311
312static int gfs2_getlabel(struct file *filp, char __user *label)
313{
314 struct inode *inode = file_inode(filp);
315 struct gfs2_sbd *sdp = GFS2_SB(inode);
316
317 if (copy_to_user(label, sdp->sd_sb.sb_locktable, GFS2_LOCKNAME_LEN))
318 return -EFAULT;
319
320 return 0;
321}
322
323static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
324{
325 switch(cmd) {
326 case FITRIM:
327 return gfs2_fitrim(filp, (void __user *)arg);
328 case FS_IOC_GETFSLABEL:
329 return gfs2_getlabel(filp, (char __user *)arg);
330 }
331
332 return -ENOTTY;
333}
334
335#ifdef CONFIG_COMPAT
336static long gfs2_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
337{
338 switch(cmd) {
339 /* Keep this list in sync with gfs2_ioctl */
340 case FITRIM:
341 case FS_IOC_GETFSLABEL:
342 break;
343 default:
344 return -ENOIOCTLCMD;
345 }
346
347 return gfs2_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
348}
349#else
350#define gfs2_compat_ioctl NULL
351#endif
352
353/**
354 * gfs2_size_hint - Give a hint to the size of a write request
355 * @filep: The struct file
356 * @offset: The file offset of the write
357 * @size: The length of the write
358 *
359 * When we are about to do a write, this function records the total
360 * write size in order to provide a suitable hint to the lower layers
361 * about how many blocks will be required.
362 *
363 */
364
365static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size)
366{
367 struct inode *inode = file_inode(filep);
368 struct gfs2_sbd *sdp = GFS2_SB(inode);
369 struct gfs2_inode *ip = GFS2_I(inode);
370 size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift;
371 int hint = min_t(size_t, INT_MAX, blks);
372
373 if (hint > atomic_read(&ip->i_sizehint))
374 atomic_set(&ip->i_sizehint, hint);
375}
376
377/**
378 * gfs2_allocate_page_backing - Allocate blocks for a write fault
379 * @page: The (locked) page to allocate backing for
380 * @length: Size of the allocation
381 *
382 * We try to allocate all the blocks required for the page in one go. This
383 * might fail for various reasons, so we keep trying until all the blocks to
384 * back this page are allocated. If some of the blocks are already allocated,
385 * that is ok too.
386 */
387static int gfs2_allocate_page_backing(struct page *page, unsigned int length)
388{
389 u64 pos = page_offset(page);
390
391 do {
392 struct iomap iomap = { };
393
394 if (gfs2_iomap_alloc(page->mapping->host, pos, length, &iomap))
395 return -EIO;
396
397 if (length < iomap.length)
398 iomap.length = length;
399 length -= iomap.length;
400 pos += iomap.length;
401 } while (length > 0);
402
403 return 0;
404}
405
406/**
407 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
408 * @vmf: The virtual memory fault containing the page to become writable
409 *
410 * When the page becomes writable, we need to ensure that we have
411 * blocks allocated on disk to back that page.
412 */
413
414static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
415{
416 struct page *page = vmf->page;
417 struct inode *inode = file_inode(vmf->vma->vm_file);
418 struct gfs2_inode *ip = GFS2_I(inode);
419 struct gfs2_sbd *sdp = GFS2_SB(inode);
420 struct gfs2_alloc_parms ap = { .aflags = 0, };
421 u64 offset = page_offset(page);
422 unsigned int data_blocks, ind_blocks, rblocks;
423 vm_fault_t ret = VM_FAULT_LOCKED;
424 struct gfs2_holder gh;
425 unsigned int length;
426 loff_t size;
427 int err;
428
429 sb_start_pagefault(inode->i_sb);
430
431 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
432 err = gfs2_glock_nq(&gh);
433 if (err) {
434 ret = block_page_mkwrite_return(err);
435 goto out_uninit;
436 }
437
438 /* Check page index against inode size */
439 size = i_size_read(inode);
440 if (offset >= size) {
441 ret = VM_FAULT_SIGBUS;
442 goto out_unlock;
443 }
444
445 /* Update file times before taking page lock */
446 file_update_time(vmf->vma->vm_file);
447
448 /* page is wholly or partially inside EOF */
449 if (size - offset < PAGE_SIZE)
450 length = size - offset;
451 else
452 length = PAGE_SIZE;
453
454 gfs2_size_hint(vmf->vma->vm_file, offset, length);
455
456 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
457 set_bit(GIF_SW_PAGED, &ip->i_flags);
458
459 /*
460 * iomap_writepage / iomap_writepages currently don't support inline
461 * files, so always unstuff here.
462 */
463
464 if (!gfs2_is_stuffed(ip) &&
465 !gfs2_write_alloc_required(ip, offset, length)) {
466 lock_page(page);
467 if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
468 ret = VM_FAULT_NOPAGE;
469 unlock_page(page);
470 }
471 goto out_unlock;
472 }
473
474 err = gfs2_rindex_update(sdp);
475 if (err) {
476 ret = block_page_mkwrite_return(err);
477 goto out_unlock;
478 }
479
480 gfs2_write_calc_reserv(ip, length, &data_blocks, &ind_blocks);
481 ap.target = data_blocks + ind_blocks;
482 err = gfs2_quota_lock_check(ip, &ap);
483 if (err) {
484 ret = block_page_mkwrite_return(err);
485 goto out_unlock;
486 }
487 err = gfs2_inplace_reserve(ip, &ap);
488 if (err) {
489 ret = block_page_mkwrite_return(err);
490 goto out_quota_unlock;
491 }
492
493 rblocks = RES_DINODE + ind_blocks;
494 if (gfs2_is_jdata(ip))
495 rblocks += data_blocks ? data_blocks : 1;
496 if (ind_blocks || data_blocks) {
497 rblocks += RES_STATFS + RES_QUOTA;
498 rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
499 }
500 err = gfs2_trans_begin(sdp, rblocks, 0);
501 if (err) {
502 ret = block_page_mkwrite_return(err);
503 goto out_trans_fail;
504 }
505
506 /* Unstuff, if required, and allocate backing blocks for page */
507 if (gfs2_is_stuffed(ip)) {
508 err = gfs2_unstuff_dinode(ip);
509 if (err) {
510 ret = block_page_mkwrite_return(err);
511 goto out_trans_end;
512 }
513 }
514
515 lock_page(page);
516 /* If truncated, we must retry the operation, we may have raced
517 * with the glock demotion code.
518 */
519 if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
520 ret = VM_FAULT_NOPAGE;
521 goto out_page_locked;
522 }
523
524 err = gfs2_allocate_page_backing(page, length);
525 if (err)
526 ret = block_page_mkwrite_return(err);
527
528out_page_locked:
529 if (ret != VM_FAULT_LOCKED)
530 unlock_page(page);
531out_trans_end:
532 gfs2_trans_end(sdp);
533out_trans_fail:
534 gfs2_inplace_release(ip);
535out_quota_unlock:
536 gfs2_quota_unlock(ip);
537out_unlock:
538 gfs2_glock_dq(&gh);
539out_uninit:
540 gfs2_holder_uninit(&gh);
541 if (ret == VM_FAULT_LOCKED) {
542 set_page_dirty(page);
543 wait_for_stable_page(page);
544 }
545 sb_end_pagefault(inode->i_sb);
546 return ret;
547}
548
549static vm_fault_t gfs2_fault(struct vm_fault *vmf)
550{
551 struct inode *inode = file_inode(vmf->vma->vm_file);
552 struct gfs2_inode *ip = GFS2_I(inode);
553 struct gfs2_holder gh;
554 vm_fault_t ret;
555 int err;
556
557 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
558 err = gfs2_glock_nq(&gh);
559 if (err) {
560 ret = block_page_mkwrite_return(err);
561 goto out_uninit;
562 }
563 ret = filemap_fault(vmf);
564 gfs2_glock_dq(&gh);
565out_uninit:
566 gfs2_holder_uninit(&gh);
567 return ret;
568}
569
570static const struct vm_operations_struct gfs2_vm_ops = {
571 .fault = gfs2_fault,
572 .map_pages = filemap_map_pages,
573 .page_mkwrite = gfs2_page_mkwrite,
574};
575
576/**
577 * gfs2_mmap
578 * @file: The file to map
579 * @vma: The VMA which described the mapping
580 *
581 * There is no need to get a lock here unless we should be updating
582 * atime. We ignore any locking errors since the only consequence is
583 * a missed atime update (which will just be deferred until later).
584 *
585 * Returns: 0
586 */
587
588static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
589{
590 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
591
592 if (!(file->f_flags & O_NOATIME) &&
593 !IS_NOATIME(&ip->i_inode)) {
594 struct gfs2_holder i_gh;
595 int error;
596
597 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
598 &i_gh);
599 if (error)
600 return error;
601 /* grab lock to update inode */
602 gfs2_glock_dq_uninit(&i_gh);
603 file_accessed(file);
604 }
605 vma->vm_ops = &gfs2_vm_ops;
606
607 return 0;
608}
609
610/**
611 * gfs2_open_common - This is common to open and atomic_open
612 * @inode: The inode being opened
613 * @file: The file being opened
614 *
615 * This maybe called under a glock or not depending upon how it has
616 * been called. We must always be called under a glock for regular
617 * files, however. For other file types, it does not matter whether
618 * we hold the glock or not.
619 *
620 * Returns: Error code or 0 for success
621 */
622
623int gfs2_open_common(struct inode *inode, struct file *file)
624{
625 struct gfs2_file *fp;
626 int ret;
627
628 if (S_ISREG(inode->i_mode)) {
629 ret = generic_file_open(inode, file);
630 if (ret)
631 return ret;
632 }
633
634 fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS);
635 if (!fp)
636 return -ENOMEM;
637
638 mutex_init(&fp->f_fl_mutex);
639
640 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
641 file->private_data = fp;
642 if (file->f_mode & FMODE_WRITE) {
643 ret = gfs2_qa_get(GFS2_I(inode));
644 if (ret)
645 goto fail;
646 }
647 return 0;
648
649fail:
650 kfree(file->private_data);
651 file->private_data = NULL;
652 return ret;
653}
654
655/**
656 * gfs2_open - open a file
657 * @inode: the inode to open
658 * @file: the struct file for this opening
659 *
660 * After atomic_open, this function is only used for opening files
661 * which are already cached. We must still get the glock for regular
662 * files to ensure that we have the file size uptodate for the large
663 * file check which is in the common code. That is only an issue for
664 * regular files though.
665 *
666 * Returns: errno
667 */
668
669static int gfs2_open(struct inode *inode, struct file *file)
670{
671 struct gfs2_inode *ip = GFS2_I(inode);
672 struct gfs2_holder i_gh;
673 int error;
674 bool need_unlock = false;
675
676 if (S_ISREG(ip->i_inode.i_mode)) {
677 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
678 &i_gh);
679 if (error)
680 return error;
681 need_unlock = true;
682 }
683
684 error = gfs2_open_common(inode, file);
685
686 if (need_unlock)
687 gfs2_glock_dq_uninit(&i_gh);
688
689 return error;
690}
691
692/**
693 * gfs2_release - called to close a struct file
694 * @inode: the inode the struct file belongs to
695 * @file: the struct file being closed
696 *
697 * Returns: errno
698 */
699
700static int gfs2_release(struct inode *inode, struct file *file)
701{
702 struct gfs2_inode *ip = GFS2_I(inode);
703
704 kfree(file->private_data);
705 file->private_data = NULL;
706
707 if (file->f_mode & FMODE_WRITE) {
708 if (gfs2_rs_active(&ip->i_res))
709 gfs2_rs_delete(ip);
710 gfs2_qa_put(ip);
711 }
712 return 0;
713}
714
715/**
716 * gfs2_fsync - sync the dirty data for a file (across the cluster)
717 * @file: the file that points to the dentry
718 * @start: the start position in the file to sync
719 * @end: the end position in the file to sync
720 * @datasync: set if we can ignore timestamp changes
721 *
722 * We split the data flushing here so that we don't wait for the data
723 * until after we've also sent the metadata to disk. Note that for
724 * data=ordered, we will write & wait for the data at the log flush
725 * stage anyway, so this is unlikely to make much of a difference
726 * except in the data=writeback case.
727 *
728 * If the fdatawrite fails due to any reason except -EIO, we will
729 * continue the remainder of the fsync, although we'll still report
730 * the error at the end. This is to match filemap_write_and_wait_range()
731 * behaviour.
732 *
733 * Returns: errno
734 */
735
736static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
737 int datasync)
738{
739 struct address_space *mapping = file->f_mapping;
740 struct inode *inode = mapping->host;
741 int sync_state = inode->i_state & I_DIRTY;
742 struct gfs2_inode *ip = GFS2_I(inode);
743 int ret = 0, ret1 = 0;
744
745 if (mapping->nrpages) {
746 ret1 = filemap_fdatawrite_range(mapping, start, end);
747 if (ret1 == -EIO)
748 return ret1;
749 }
750
751 if (!gfs2_is_jdata(ip))
752 sync_state &= ~I_DIRTY_PAGES;
753 if (datasync)
754 sync_state &= ~I_DIRTY_SYNC;
755
756 if (sync_state) {
757 ret = sync_inode_metadata(inode, 1);
758 if (ret)
759 return ret;
760 if (gfs2_is_jdata(ip))
761 ret = file_write_and_wait(file);
762 if (ret)
763 return ret;
764 gfs2_ail_flush(ip->i_gl, 1);
765 }
766
767 if (mapping->nrpages)
768 ret = file_fdatawait_range(file, start, end);
769
770 return ret ? ret : ret1;
771}
772
773static inline bool should_fault_in_pages(struct iov_iter *i,
774 struct kiocb *iocb,
775 size_t *prev_count,
776 size_t *window_size)
777{
778 size_t count = iov_iter_count(i);
779 size_t size, offs;
780
781 if (!count)
782 return false;
783 if (!user_backed_iter(i))
784 return false;
785
786 size = PAGE_SIZE;
787 offs = offset_in_page(iocb->ki_pos);
788 if (*prev_count != count || !*window_size) {
789 size_t nr_dirtied;
790
791 nr_dirtied = max(current->nr_dirtied_pause -
792 current->nr_dirtied, 8);
793 size = min_t(size_t, SZ_1M, nr_dirtied << PAGE_SHIFT);
794 }
795
796 *prev_count = count;
797 *window_size = size - offs;
798 return true;
799}
800
801static ssize_t gfs2_file_direct_read(struct kiocb *iocb, struct iov_iter *to,
802 struct gfs2_holder *gh)
803{
804 struct file *file = iocb->ki_filp;
805 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
806 size_t prev_count = 0, window_size = 0;
807 size_t read = 0;
808 ssize_t ret;
809
810 /*
811 * In this function, we disable page faults when we're holding the
812 * inode glock while doing I/O. If a page fault occurs, we indicate
813 * that the inode glock may be dropped, fault in the pages manually,
814 * and retry.
815 *
816 * Unlike generic_file_read_iter, for reads, iomap_dio_rw can trigger
817 * physical as well as manual page faults, and we need to disable both
818 * kinds.
819 *
820 * For direct I/O, gfs2 takes the inode glock in deferred mode. This
821 * locking mode is compatible with other deferred holders, so multiple
822 * processes and nodes can do direct I/O to a file at the same time.
823 * There's no guarantee that reads or writes will be atomic. Any
824 * coordination among readers and writers needs to happen externally.
825 */
826
827 if (!iov_iter_count(to))
828 return 0; /* skip atime */
829
830 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, gh);
831retry:
832 ret = gfs2_glock_nq(gh);
833 if (ret)
834 goto out_uninit;
835 pagefault_disable();
836 to->nofault = true;
837 ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL,
838 IOMAP_DIO_PARTIAL, NULL, read);
839 to->nofault = false;
840 pagefault_enable();
841 if (ret <= 0 && ret != -EFAULT)
842 goto out_unlock;
843 /* No increment (+=) because iomap_dio_rw returns a cumulative value. */
844 if (ret > 0)
845 read = ret;
846
847 if (should_fault_in_pages(to, iocb, &prev_count, &window_size)) {
848 gfs2_glock_dq(gh);
849 window_size -= fault_in_iov_iter_writeable(to, window_size);
850 if (window_size)
851 goto retry;
852 }
853out_unlock:
854 if (gfs2_holder_queued(gh))
855 gfs2_glock_dq(gh);
856out_uninit:
857 gfs2_holder_uninit(gh);
858 /* User space doesn't expect partial success. */
859 if (ret < 0)
860 return ret;
861 return read;
862}
863
864static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from,
865 struct gfs2_holder *gh)
866{
867 struct file *file = iocb->ki_filp;
868 struct inode *inode = file->f_mapping->host;
869 struct gfs2_inode *ip = GFS2_I(inode);
870 size_t prev_count = 0, window_size = 0;
871 size_t written = 0;
872 ssize_t ret;
873
874 /*
875 * In this function, we disable page faults when we're holding the
876 * inode glock while doing I/O. If a page fault occurs, we indicate
877 * that the inode glock may be dropped, fault in the pages manually,
878 * and retry.
879 *
880 * For writes, iomap_dio_rw only triggers manual page faults, so we
881 * don't need to disable physical ones.
882 */
883
884 /*
885 * Deferred lock, even if its a write, since we do no allocation on
886 * this path. All we need to change is the atime, and this lock mode
887 * ensures that other nodes have flushed their buffered read caches
888 * (i.e. their page cache entries for this inode). We do not,
889 * unfortunately, have the option of only flushing a range like the
890 * VFS does.
891 */
892 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, gh);
893retry:
894 ret = gfs2_glock_nq(gh);
895 if (ret)
896 goto out_uninit;
897 /* Silently fall back to buffered I/O when writing beyond EOF */
898 if (iocb->ki_pos + iov_iter_count(from) > i_size_read(&ip->i_inode))
899 goto out_unlock;
900
901 from->nofault = true;
902 ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL,
903 IOMAP_DIO_PARTIAL, NULL, written);
904 from->nofault = false;
905 if (ret <= 0) {
906 if (ret == -ENOTBLK)
907 ret = 0;
908 if (ret != -EFAULT)
909 goto out_unlock;
910 }
911 /* No increment (+=) because iomap_dio_rw returns a cumulative value. */
912 if (ret > 0)
913 written = ret;
914
915 if (should_fault_in_pages(from, iocb, &prev_count, &window_size)) {
916 gfs2_glock_dq(gh);
917 window_size -= fault_in_iov_iter_readable(from, window_size);
918 if (window_size)
919 goto retry;
920 }
921out_unlock:
922 if (gfs2_holder_queued(gh))
923 gfs2_glock_dq(gh);
924out_uninit:
925 gfs2_holder_uninit(gh);
926 /* User space doesn't expect partial success. */
927 if (ret < 0)
928 return ret;
929 return written;
930}
931
932static ssize_t gfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
933{
934 struct gfs2_inode *ip;
935 struct gfs2_holder gh;
936 size_t prev_count = 0, window_size = 0;
937 size_t read = 0;
938 ssize_t ret;
939
940 /*
941 * In this function, we disable page faults when we're holding the
942 * inode glock while doing I/O. If a page fault occurs, we indicate
943 * that the inode glock may be dropped, fault in the pages manually,
944 * and retry.
945 */
946
947 if (iocb->ki_flags & IOCB_DIRECT)
948 return gfs2_file_direct_read(iocb, to, &gh);
949
950 pagefault_disable();
951 iocb->ki_flags |= IOCB_NOIO;
952 ret = generic_file_read_iter(iocb, to);
953 iocb->ki_flags &= ~IOCB_NOIO;
954 pagefault_enable();
955 if (ret >= 0) {
956 if (!iov_iter_count(to))
957 return ret;
958 read = ret;
959 } else if (ret != -EFAULT) {
960 if (ret != -EAGAIN)
961 return ret;
962 if (iocb->ki_flags & IOCB_NOWAIT)
963 return ret;
964 }
965 ip = GFS2_I(iocb->ki_filp->f_mapping->host);
966 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
967retry:
968 ret = gfs2_glock_nq(&gh);
969 if (ret)
970 goto out_uninit;
971 pagefault_disable();
972 ret = generic_file_read_iter(iocb, to);
973 pagefault_enable();
974 if (ret <= 0 && ret != -EFAULT)
975 goto out_unlock;
976 if (ret > 0)
977 read += ret;
978
979 if (should_fault_in_pages(to, iocb, &prev_count, &window_size)) {
980 gfs2_glock_dq(&gh);
981 window_size -= fault_in_iov_iter_writeable(to, window_size);
982 if (window_size)
983 goto retry;
984 }
985out_unlock:
986 if (gfs2_holder_queued(&gh))
987 gfs2_glock_dq(&gh);
988out_uninit:
989 gfs2_holder_uninit(&gh);
990 return read ? read : ret;
991}
992
993static ssize_t gfs2_file_buffered_write(struct kiocb *iocb,
994 struct iov_iter *from,
995 struct gfs2_holder *gh)
996{
997 struct file *file = iocb->ki_filp;
998 struct inode *inode = file_inode(file);
999 struct gfs2_inode *ip = GFS2_I(inode);
1000 struct gfs2_sbd *sdp = GFS2_SB(inode);
1001 struct gfs2_holder *statfs_gh = NULL;
1002 size_t prev_count = 0, window_size = 0;
1003 size_t orig_count = iov_iter_count(from);
1004 size_t written = 0;
1005 ssize_t ret;
1006
1007 /*
1008 * In this function, we disable page faults when we're holding the
1009 * inode glock while doing I/O. If a page fault occurs, we indicate
1010 * that the inode glock may be dropped, fault in the pages manually,
1011 * and retry.
1012 */
1013
1014 if (inode == sdp->sd_rindex) {
1015 statfs_gh = kmalloc(sizeof(*statfs_gh), GFP_NOFS);
1016 if (!statfs_gh)
1017 return -ENOMEM;
1018 }
1019
1020 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, gh);
1021retry:
1022 if (should_fault_in_pages(from, iocb, &prev_count, &window_size)) {
1023 window_size -= fault_in_iov_iter_readable(from, window_size);
1024 if (!window_size) {
1025 ret = -EFAULT;
1026 goto out_uninit;
1027 }
1028 from->count = min(from->count, window_size);
1029 }
1030 ret = gfs2_glock_nq(gh);
1031 if (ret)
1032 goto out_uninit;
1033
1034 if (inode == sdp->sd_rindex) {
1035 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
1036
1037 ret = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE,
1038 GL_NOCACHE, statfs_gh);
1039 if (ret)
1040 goto out_unlock;
1041 }
1042
1043 current->backing_dev_info = inode_to_bdi(inode);
1044 pagefault_disable();
1045 ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
1046 pagefault_enable();
1047 current->backing_dev_info = NULL;
1048 if (ret > 0) {
1049 iocb->ki_pos += ret;
1050 written += ret;
1051 }
1052
1053 if (inode == sdp->sd_rindex)
1054 gfs2_glock_dq_uninit(statfs_gh);
1055
1056 if (ret <= 0 && ret != -EFAULT)
1057 goto out_unlock;
1058
1059 from->count = orig_count - written;
1060 if (should_fault_in_pages(from, iocb, &prev_count, &window_size)) {
1061 gfs2_glock_dq(gh);
1062 goto retry;
1063 }
1064out_unlock:
1065 if (gfs2_holder_queued(gh))
1066 gfs2_glock_dq(gh);
1067out_uninit:
1068 gfs2_holder_uninit(gh);
1069 kfree(statfs_gh);
1070 from->count = orig_count - written;
1071 return written ? written : ret;
1072}
1073
1074/**
1075 * gfs2_file_write_iter - Perform a write to a file
1076 * @iocb: The io context
1077 * @from: The data to write
1078 *
1079 * We have to do a lock/unlock here to refresh the inode size for
1080 * O_APPEND writes, otherwise we can land up writing at the wrong
1081 * offset. There is still a race, but provided the app is using its
1082 * own file locking, this will make O_APPEND work as expected.
1083 *
1084 */
1085
1086static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
1087{
1088 struct file *file = iocb->ki_filp;
1089 struct inode *inode = file_inode(file);
1090 struct gfs2_inode *ip = GFS2_I(inode);
1091 struct gfs2_holder gh;
1092 ssize_t ret;
1093
1094 gfs2_size_hint(file, iocb->ki_pos, iov_iter_count(from));
1095
1096 if (iocb->ki_flags & IOCB_APPEND) {
1097 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1098 if (ret)
1099 return ret;
1100 gfs2_glock_dq_uninit(&gh);
1101 }
1102
1103 inode_lock(inode);
1104 ret = generic_write_checks(iocb, from);
1105 if (ret <= 0)
1106 goto out_unlock;
1107
1108 ret = file_remove_privs(file);
1109 if (ret)
1110 goto out_unlock;
1111
1112 ret = file_update_time(file);
1113 if (ret)
1114 goto out_unlock;
1115
1116 if (iocb->ki_flags & IOCB_DIRECT) {
1117 struct address_space *mapping = file->f_mapping;
1118 ssize_t buffered, ret2;
1119
1120 ret = gfs2_file_direct_write(iocb, from, &gh);
1121 if (ret < 0 || !iov_iter_count(from))
1122 goto out_unlock;
1123
1124 iocb->ki_flags |= IOCB_DSYNC;
1125 buffered = gfs2_file_buffered_write(iocb, from, &gh);
1126 if (unlikely(buffered <= 0)) {
1127 if (!ret)
1128 ret = buffered;
1129 goto out_unlock;
1130 }
1131
1132 /*
1133 * We need to ensure that the page cache pages are written to
1134 * disk and invalidated to preserve the expected O_DIRECT
1135 * semantics. If the writeback or invalidate fails, only report
1136 * the direct I/O range as we don't know if the buffered pages
1137 * made it to disk.
1138 */
1139 ret2 = generic_write_sync(iocb, buffered);
1140 invalidate_mapping_pages(mapping,
1141 (iocb->ki_pos - buffered) >> PAGE_SHIFT,
1142 (iocb->ki_pos - 1) >> PAGE_SHIFT);
1143 if (!ret || ret2 > 0)
1144 ret += ret2;
1145 } else {
1146 ret = gfs2_file_buffered_write(iocb, from, &gh);
1147 if (likely(ret > 0))
1148 ret = generic_write_sync(iocb, ret);
1149 }
1150
1151out_unlock:
1152 inode_unlock(inode);
1153 return ret;
1154}
1155
1156static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
1157 int mode)
1158{
1159 struct super_block *sb = inode->i_sb;
1160 struct gfs2_inode *ip = GFS2_I(inode);
1161 loff_t end = offset + len;
1162 struct buffer_head *dibh;
1163 int error;
1164
1165 error = gfs2_meta_inode_buffer(ip, &dibh);
1166 if (unlikely(error))
1167 return error;
1168
1169 gfs2_trans_add_meta(ip->i_gl, dibh);
1170
1171 if (gfs2_is_stuffed(ip)) {
1172 error = gfs2_unstuff_dinode(ip);
1173 if (unlikely(error))
1174 goto out;
1175 }
1176
1177 while (offset < end) {
1178 struct iomap iomap = { };
1179
1180 error = gfs2_iomap_alloc(inode, offset, end - offset, &iomap);
1181 if (error)
1182 goto out;
1183 offset = iomap.offset + iomap.length;
1184 if (!(iomap.flags & IOMAP_F_NEW))
1185 continue;
1186 error = sb_issue_zeroout(sb, iomap.addr >> inode->i_blkbits,
1187 iomap.length >> inode->i_blkbits,
1188 GFP_NOFS);
1189 if (error) {
1190 fs_err(GFS2_SB(inode), "Failed to zero data buffers\n");
1191 goto out;
1192 }
1193 }
1194out:
1195 brelse(dibh);
1196 return error;
1197}
1198
1199/**
1200 * calc_max_reserv() - Reverse of write_calc_reserv. Given a number of
1201 * blocks, determine how many bytes can be written.
1202 * @ip: The inode in question.
1203 * @len: Max cap of bytes. What we return in *len must be <= this.
1204 * @data_blocks: Compute and return the number of data blocks needed
1205 * @ind_blocks: Compute and return the number of indirect blocks needed
1206 * @max_blocks: The total blocks available to work with.
1207 *
1208 * Returns: void, but @len, @data_blocks and @ind_blocks are filled in.
1209 */
1210static void calc_max_reserv(struct gfs2_inode *ip, loff_t *len,
1211 unsigned int *data_blocks, unsigned int *ind_blocks,
1212 unsigned int max_blocks)
1213{
1214 loff_t max = *len;
1215 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1216 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
1217
1218 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
1219 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
1220 max_data -= tmp;
1221 }
1222
1223 *data_blocks = max_data;
1224 *ind_blocks = max_blocks - max_data;
1225 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
1226 if (*len > max) {
1227 *len = max;
1228 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
1229 }
1230}
1231
1232static long __gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
1233{
1234 struct inode *inode = file_inode(file);
1235 struct gfs2_sbd *sdp = GFS2_SB(inode);
1236 struct gfs2_inode *ip = GFS2_I(inode);
1237 struct gfs2_alloc_parms ap = { .aflags = 0, };
1238 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
1239 loff_t bytes, max_bytes, max_blks;
1240 int error;
1241 const loff_t pos = offset;
1242 const loff_t count = len;
1243 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
1244 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
1245 loff_t max_chunk_size = UINT_MAX & bsize_mask;
1246
1247 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
1248
1249 offset &= bsize_mask;
1250
1251 len = next - offset;
1252 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
1253 if (!bytes)
1254 bytes = UINT_MAX;
1255 bytes &= bsize_mask;
1256 if (bytes == 0)
1257 bytes = sdp->sd_sb.sb_bsize;
1258
1259 gfs2_size_hint(file, offset, len);
1260
1261 gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
1262 ap.min_target = data_blocks + ind_blocks;
1263
1264 while (len > 0) {
1265 if (len < bytes)
1266 bytes = len;
1267 if (!gfs2_write_alloc_required(ip, offset, bytes)) {
1268 len -= bytes;
1269 offset += bytes;
1270 continue;
1271 }
1272
1273 /* We need to determine how many bytes we can actually
1274 * fallocate without exceeding quota or going over the
1275 * end of the fs. We start off optimistically by assuming
1276 * we can write max_bytes */
1277 max_bytes = (len > max_chunk_size) ? max_chunk_size : len;
1278
1279 /* Since max_bytes is most likely a theoretical max, we
1280 * calculate a more realistic 'bytes' to serve as a good
1281 * starting point for the number of bytes we may be able
1282 * to write */
1283 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
1284 ap.target = data_blocks + ind_blocks;
1285
1286 error = gfs2_quota_lock_check(ip, &ap);
1287 if (error)
1288 return error;
1289 /* ap.allowed tells us how many blocks quota will allow
1290 * us to write. Check if this reduces max_blks */
1291 max_blks = UINT_MAX;
1292 if (ap.allowed)
1293 max_blks = ap.allowed;
1294
1295 error = gfs2_inplace_reserve(ip, &ap);
1296 if (error)
1297 goto out_qunlock;
1298
1299 /* check if the selected rgrp limits our max_blks further */
1300 if (ip->i_res.rs_reserved < max_blks)
1301 max_blks = ip->i_res.rs_reserved;
1302
1303 /* Almost done. Calculate bytes that can be written using
1304 * max_blks. We also recompute max_bytes, data_blocks and
1305 * ind_blocks */
1306 calc_max_reserv(ip, &max_bytes, &data_blocks,
1307 &ind_blocks, max_blks);
1308
1309 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
1310 RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks);
1311 if (gfs2_is_jdata(ip))
1312 rblocks += data_blocks ? data_blocks : 1;
1313
1314 error = gfs2_trans_begin(sdp, rblocks,
1315 PAGE_SIZE >> inode->i_blkbits);
1316 if (error)
1317 goto out_trans_fail;
1318
1319 error = fallocate_chunk(inode, offset, max_bytes, mode);
1320 gfs2_trans_end(sdp);
1321
1322 if (error)
1323 goto out_trans_fail;
1324
1325 len -= max_bytes;
1326 offset += max_bytes;
1327 gfs2_inplace_release(ip);
1328 gfs2_quota_unlock(ip);
1329 }
1330
1331 if (!(mode & FALLOC_FL_KEEP_SIZE) && (pos + count) > inode->i_size)
1332 i_size_write(inode, pos + count);
1333 file_update_time(file);
1334 mark_inode_dirty(inode);
1335
1336 if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host))
1337 return vfs_fsync_range(file, pos, pos + count - 1,
1338 (file->f_flags & __O_SYNC) ? 0 : 1);
1339 return 0;
1340
1341out_trans_fail:
1342 gfs2_inplace_release(ip);
1343out_qunlock:
1344 gfs2_quota_unlock(ip);
1345 return error;
1346}
1347
1348static long gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
1349{
1350 struct inode *inode = file_inode(file);
1351 struct gfs2_sbd *sdp = GFS2_SB(inode);
1352 struct gfs2_inode *ip = GFS2_I(inode);
1353 struct gfs2_holder gh;
1354 int ret;
1355
1356 if (mode & ~(FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE))
1357 return -EOPNOTSUPP;
1358 /* fallocate is needed by gfs2_grow to reserve space in the rindex */
1359 if (gfs2_is_jdata(ip) && inode != sdp->sd_rindex)
1360 return -EOPNOTSUPP;
1361
1362 inode_lock(inode);
1363
1364 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1365 ret = gfs2_glock_nq(&gh);
1366 if (ret)
1367 goto out_uninit;
1368
1369 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
1370 (offset + len) > inode->i_size) {
1371 ret = inode_newsize_ok(inode, offset + len);
1372 if (ret)
1373 goto out_unlock;
1374 }
1375
1376 ret = get_write_access(inode);
1377 if (ret)
1378 goto out_unlock;
1379
1380 if (mode & FALLOC_FL_PUNCH_HOLE) {
1381 ret = __gfs2_punch_hole(file, offset, len);
1382 } else {
1383 ret = __gfs2_fallocate(file, mode, offset, len);
1384 if (ret)
1385 gfs2_rs_deltree(&ip->i_res);
1386 }
1387
1388 put_write_access(inode);
1389out_unlock:
1390 gfs2_glock_dq(&gh);
1391out_uninit:
1392 gfs2_holder_uninit(&gh);
1393 inode_unlock(inode);
1394 return ret;
1395}
1396
1397static ssize_t gfs2_file_splice_write(struct pipe_inode_info *pipe,
1398 struct file *out, loff_t *ppos,
1399 size_t len, unsigned int flags)
1400{
1401 ssize_t ret;
1402
1403 gfs2_size_hint(out, *ppos, len);
1404
1405 ret = iter_file_splice_write(pipe, out, ppos, len, flags);
1406 return ret;
1407}
1408
1409#ifdef CONFIG_GFS2_FS_LOCKING_DLM
1410
1411/**
1412 * gfs2_lock - acquire/release a posix lock on a file
1413 * @file: the file pointer
1414 * @cmd: either modify or retrieve lock state, possibly wait
1415 * @fl: type and range of lock
1416 *
1417 * Returns: errno
1418 */
1419
1420static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
1421{
1422 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
1423 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
1424 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1425
1426 if (!(fl->fl_flags & FL_POSIX))
1427 return -ENOLCK;
1428 if (cmd == F_CANCELLK) {
1429 /* Hack: */
1430 cmd = F_SETLK;
1431 fl->fl_type = F_UNLCK;
1432 }
1433 if (unlikely(gfs2_withdrawn(sdp))) {
1434 if (fl->fl_type == F_UNLCK)
1435 locks_lock_file_wait(file, fl);
1436 return -EIO;
1437 }
1438 if (IS_GETLK(cmd))
1439 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
1440 else if (fl->fl_type == F_UNLCK)
1441 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
1442 else
1443 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
1444}
1445
1446static void __flock_holder_uninit(struct file *file, struct gfs2_holder *fl_gh)
1447{
1448 struct gfs2_glock *gl = gfs2_glock_hold(fl_gh->gh_gl);
1449
1450 /*
1451 * Make sure gfs2_glock_put() won't sleep under the file->f_lock
1452 * spinlock.
1453 */
1454
1455 spin_lock(&file->f_lock);
1456 gfs2_holder_uninit(fl_gh);
1457 spin_unlock(&file->f_lock);
1458 gfs2_glock_put(gl);
1459}
1460
1461static int do_flock(struct file *file, int cmd, struct file_lock *fl)
1462{
1463 struct gfs2_file *fp = file->private_data;
1464 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1465 struct gfs2_inode *ip = GFS2_I(file_inode(file));
1466 struct gfs2_glock *gl;
1467 unsigned int state;
1468 u16 flags;
1469 int error = 0;
1470 int sleeptime;
1471
1472 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
1473 flags = GL_EXACT | GL_NOPID;
1474 if (!IS_SETLKW(cmd))
1475 flags |= LM_FLAG_TRY_1CB;
1476
1477 mutex_lock(&fp->f_fl_mutex);
1478
1479 if (gfs2_holder_initialized(fl_gh)) {
1480 struct file_lock request;
1481 if (fl_gh->gh_state == state)
1482 goto out;
1483 locks_init_lock(&request);
1484 request.fl_type = F_UNLCK;
1485 request.fl_flags = FL_FLOCK;
1486 locks_lock_file_wait(file, &request);
1487 gfs2_glock_dq(fl_gh);
1488 gfs2_holder_reinit(state, flags, fl_gh);
1489 } else {
1490 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
1491 &gfs2_flock_glops, CREATE, &gl);
1492 if (error)
1493 goto out;
1494 spin_lock(&file->f_lock);
1495 gfs2_holder_init(gl, state, flags, fl_gh);
1496 spin_unlock(&file->f_lock);
1497 gfs2_glock_put(gl);
1498 }
1499 for (sleeptime = 1; sleeptime <= 4; sleeptime <<= 1) {
1500 error = gfs2_glock_nq(fl_gh);
1501 if (error != GLR_TRYFAILED)
1502 break;
1503 fl_gh->gh_flags &= ~LM_FLAG_TRY_1CB;
1504 fl_gh->gh_flags |= LM_FLAG_TRY;
1505 msleep(sleeptime);
1506 }
1507 if (error) {
1508 __flock_holder_uninit(file, fl_gh);
1509 if (error == GLR_TRYFAILED)
1510 error = -EAGAIN;
1511 } else {
1512 error = locks_lock_file_wait(file, fl);
1513 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1514 }
1515
1516out:
1517 mutex_unlock(&fp->f_fl_mutex);
1518 return error;
1519}
1520
1521static void do_unflock(struct file *file, struct file_lock *fl)
1522{
1523 struct gfs2_file *fp = file->private_data;
1524 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1525
1526 mutex_lock(&fp->f_fl_mutex);
1527 locks_lock_file_wait(file, fl);
1528 if (gfs2_holder_initialized(fl_gh)) {
1529 gfs2_glock_dq(fl_gh);
1530 __flock_holder_uninit(file, fl_gh);
1531 }
1532 mutex_unlock(&fp->f_fl_mutex);
1533}
1534
1535/**
1536 * gfs2_flock - acquire/release a flock lock on a file
1537 * @file: the file pointer
1538 * @cmd: either modify or retrieve lock state, possibly wait
1539 * @fl: type and range of lock
1540 *
1541 * Returns: errno
1542 */
1543
1544static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
1545{
1546 if (!(fl->fl_flags & FL_FLOCK))
1547 return -ENOLCK;
1548
1549 if (fl->fl_type == F_UNLCK) {
1550 do_unflock(file, fl);
1551 return 0;
1552 } else {
1553 return do_flock(file, cmd, fl);
1554 }
1555}
1556
1557const struct file_operations gfs2_file_fops = {
1558 .llseek = gfs2_llseek,
1559 .read_iter = gfs2_file_read_iter,
1560 .write_iter = gfs2_file_write_iter,
1561 .iopoll = iocb_bio_iopoll,
1562 .unlocked_ioctl = gfs2_ioctl,
1563 .compat_ioctl = gfs2_compat_ioctl,
1564 .mmap = gfs2_mmap,
1565 .open = gfs2_open,
1566 .release = gfs2_release,
1567 .fsync = gfs2_fsync,
1568 .lock = gfs2_lock,
1569 .flock = gfs2_flock,
1570 .splice_read = generic_file_splice_read,
1571 .splice_write = gfs2_file_splice_write,
1572 .setlease = simple_nosetlease,
1573 .fallocate = gfs2_fallocate,
1574};
1575
1576const struct file_operations gfs2_dir_fops = {
1577 .iterate_shared = gfs2_readdir,
1578 .unlocked_ioctl = gfs2_ioctl,
1579 .compat_ioctl = gfs2_compat_ioctl,
1580 .open = gfs2_open,
1581 .release = gfs2_release,
1582 .fsync = gfs2_fsync,
1583 .lock = gfs2_lock,
1584 .flock = gfs2_flock,
1585 .llseek = default_llseek,
1586};
1587
1588#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
1589
1590const struct file_operations gfs2_file_fops_nolock = {
1591 .llseek = gfs2_llseek,
1592 .read_iter = gfs2_file_read_iter,
1593 .write_iter = gfs2_file_write_iter,
1594 .iopoll = iocb_bio_iopoll,
1595 .unlocked_ioctl = gfs2_ioctl,
1596 .compat_ioctl = gfs2_compat_ioctl,
1597 .mmap = gfs2_mmap,
1598 .open = gfs2_open,
1599 .release = gfs2_release,
1600 .fsync = gfs2_fsync,
1601 .splice_read = generic_file_splice_read,
1602 .splice_write = gfs2_file_splice_write,
1603 .setlease = generic_setlease,
1604 .fallocate = gfs2_fallocate,
1605};
1606
1607const struct file_operations gfs2_dir_fops_nolock = {
1608 .iterate_shared = gfs2_readdir,
1609 .unlocked_ioctl = gfs2_ioctl,
1610 .compat_ioctl = gfs2_compat_ioctl,
1611 .open = gfs2_open,
1612 .release = gfs2_release,
1613 .fsync = gfs2_fsync,
1614 .llseek = default_llseek,
1615};
1616
1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10#include <linux/slab.h>
11#include <linux/spinlock.h>
12#include <linux/completion.h>
13#include <linux/buffer_head.h>
14#include <linux/pagemap.h>
15#include <linux/uio.h>
16#include <linux/blkdev.h>
17#include <linux/mm.h>
18#include <linux/mount.h>
19#include <linux/fs.h>
20#include <linux/gfs2_ondisk.h>
21#include <linux/falloc.h>
22#include <linux/swap.h>
23#include <linux/crc32.h>
24#include <linux/writeback.h>
25#include <asm/uaccess.h>
26#include <linux/dlm.h>
27#include <linux/dlm_plock.h>
28#include <linux/delay.h>
29
30#include "gfs2.h"
31#include "incore.h"
32#include "bmap.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 * gfs2_llseek - seek to a location in a file
46 * @file: the file
47 * @offset: the offset
48 * @whence: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
49 *
50 * SEEK_END requires the glock for the file because it references the
51 * file's size.
52 *
53 * Returns: The new offset, or errno
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: /* These reference inode->i_size */
64 case SEEK_DATA:
65 case SEEK_HOLE:
66 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
67 &i_gh);
68 if (!error) {
69 error = generic_file_llseek(file, offset, whence);
70 gfs2_glock_dq_uninit(&i_gh);
71 }
72 break;
73 case SEEK_CUR:
74 case SEEK_SET:
75 error = generic_file_llseek(file, offset, whence);
76 break;
77 default:
78 error = -EINVAL;
79 }
80
81 return error;
82}
83
84/**
85 * gfs2_readdir - Iterator for a directory
86 * @file: The directory to read from
87 * @ctx: What to feed directory entries to
88 *
89 * Returns: errno
90 */
91
92static int gfs2_readdir(struct file *file, struct dir_context *ctx)
93{
94 struct inode *dir = file->f_mapping->host;
95 struct gfs2_inode *dip = GFS2_I(dir);
96 struct gfs2_holder d_gh;
97 int error;
98
99 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
100 if (error)
101 return error;
102
103 error = gfs2_dir_read(dir, ctx, &file->f_ra);
104
105 gfs2_glock_dq_uninit(&d_gh);
106
107 return error;
108}
109
110/**
111 * fsflags_cvt
112 * @table: A table of 32 u32 flags
113 * @val: a 32 bit value to convert
114 *
115 * This function can be used to convert between fsflags values and
116 * GFS2's own flags values.
117 *
118 * Returns: the converted flags
119 */
120static u32 fsflags_cvt(const u32 *table, u32 val)
121{
122 u32 res = 0;
123 while(val) {
124 if (val & 1)
125 res |= *table;
126 table++;
127 val >>= 1;
128 }
129 return res;
130}
131
132static const u32 fsflags_to_gfs2[32] = {
133 [3] = GFS2_DIF_SYNC,
134 [4] = GFS2_DIF_IMMUTABLE,
135 [5] = GFS2_DIF_APPENDONLY,
136 [7] = GFS2_DIF_NOATIME,
137 [12] = GFS2_DIF_EXHASH,
138 [14] = GFS2_DIF_INHERIT_JDATA,
139 [17] = GFS2_DIF_TOPDIR,
140};
141
142static const u32 gfs2_to_fsflags[32] = {
143 [gfs2fl_Sync] = FS_SYNC_FL,
144 [gfs2fl_Immutable] = FS_IMMUTABLE_FL,
145 [gfs2fl_AppendOnly] = FS_APPEND_FL,
146 [gfs2fl_NoAtime] = FS_NOATIME_FL,
147 [gfs2fl_ExHash] = FS_INDEX_FL,
148 [gfs2fl_TopLevel] = FS_TOPDIR_FL,
149 [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
150};
151
152static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
153{
154 struct inode *inode = file_inode(filp);
155 struct gfs2_inode *ip = GFS2_I(inode);
156 struct gfs2_holder gh;
157 int error;
158 u32 fsflags;
159
160 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
161 error = gfs2_glock_nq(&gh);
162 if (error)
163 return error;
164
165 fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags);
166 if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA)
167 fsflags |= FS_JOURNAL_DATA_FL;
168 if (put_user(fsflags, ptr))
169 error = -EFAULT;
170
171 gfs2_glock_dq(&gh);
172 gfs2_holder_uninit(&gh);
173 return error;
174}
175
176void gfs2_set_inode_flags(struct inode *inode)
177{
178 struct gfs2_inode *ip = GFS2_I(inode);
179 unsigned int flags = inode->i_flags;
180
181 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC);
182 if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode))
183 flags |= S_NOSEC;
184 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
185 flags |= S_IMMUTABLE;
186 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
187 flags |= S_APPEND;
188 if (ip->i_diskflags & GFS2_DIF_NOATIME)
189 flags |= S_NOATIME;
190 if (ip->i_diskflags & GFS2_DIF_SYNC)
191 flags |= S_SYNC;
192 inode->i_flags = flags;
193}
194
195/* Flags that can be set by user space */
196#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
197 GFS2_DIF_IMMUTABLE| \
198 GFS2_DIF_APPENDONLY| \
199 GFS2_DIF_NOATIME| \
200 GFS2_DIF_SYNC| \
201 GFS2_DIF_SYSTEM| \
202 GFS2_DIF_TOPDIR| \
203 GFS2_DIF_INHERIT_JDATA)
204
205/**
206 * do_gfs2_set_flags - set flags on an inode
207 * @filp: file pointer
208 * @reqflags: The flags to set
209 * @mask: Indicates which flags are valid
210 *
211 */
212static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
213{
214 struct inode *inode = file_inode(filp);
215 struct gfs2_inode *ip = GFS2_I(inode);
216 struct gfs2_sbd *sdp = GFS2_SB(inode);
217 struct buffer_head *bh;
218 struct gfs2_holder gh;
219 int error;
220 u32 new_flags, flags;
221
222 error = mnt_want_write_file(filp);
223 if (error)
224 return error;
225
226 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
227 if (error)
228 goto out_drop_write;
229
230 error = -EACCES;
231 if (!inode_owner_or_capable(inode))
232 goto out;
233
234 error = 0;
235 flags = ip->i_diskflags;
236 new_flags = (flags & ~mask) | (reqflags & mask);
237 if ((new_flags ^ flags) == 0)
238 goto out;
239
240 error = -EINVAL;
241 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
242 goto out;
243
244 error = -EPERM;
245 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
246 goto out;
247 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
248 goto out;
249 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
250 !capable(CAP_LINUX_IMMUTABLE))
251 goto out;
252 if (!IS_IMMUTABLE(inode)) {
253 error = gfs2_permission(inode, MAY_WRITE);
254 if (error)
255 goto out;
256 }
257 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
258 if (flags & GFS2_DIF_JDATA)
259 gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH);
260 error = filemap_fdatawrite(inode->i_mapping);
261 if (error)
262 goto out;
263 error = filemap_fdatawait(inode->i_mapping);
264 if (error)
265 goto out;
266 }
267 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
268 if (error)
269 goto out;
270 error = gfs2_meta_inode_buffer(ip, &bh);
271 if (error)
272 goto out_trans_end;
273 gfs2_trans_add_meta(ip->i_gl, bh);
274 ip->i_diskflags = new_flags;
275 gfs2_dinode_out(ip, bh->b_data);
276 brelse(bh);
277 gfs2_set_inode_flags(inode);
278 gfs2_set_aops(inode);
279out_trans_end:
280 gfs2_trans_end(sdp);
281out:
282 gfs2_glock_dq_uninit(&gh);
283out_drop_write:
284 mnt_drop_write_file(filp);
285 return error;
286}
287
288static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
289{
290 struct inode *inode = file_inode(filp);
291 u32 fsflags, gfsflags;
292
293 if (get_user(fsflags, ptr))
294 return -EFAULT;
295
296 gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
297 if (!S_ISDIR(inode->i_mode)) {
298 gfsflags &= ~GFS2_DIF_TOPDIR;
299 if (gfsflags & GFS2_DIF_INHERIT_JDATA)
300 gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);
301 return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_SYSTEM);
302 }
303 return do_gfs2_set_flags(filp, gfsflags, ~(GFS2_DIF_SYSTEM | GFS2_DIF_JDATA));
304}
305
306static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
307{
308 switch(cmd) {
309 case FS_IOC_GETFLAGS:
310 return gfs2_get_flags(filp, (u32 __user *)arg);
311 case FS_IOC_SETFLAGS:
312 return gfs2_set_flags(filp, (u32 __user *)arg);
313 case FITRIM:
314 return gfs2_fitrim(filp, (void __user *)arg);
315 }
316 return -ENOTTY;
317}
318
319/**
320 * gfs2_size_hint - Give a hint to the size of a write request
321 * @filep: The struct file
322 * @offset: The file offset of the write
323 * @size: The length of the write
324 *
325 * When we are about to do a write, this function records the total
326 * write size in order to provide a suitable hint to the lower layers
327 * about how many blocks will be required.
328 *
329 */
330
331static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size)
332{
333 struct inode *inode = file_inode(filep);
334 struct gfs2_sbd *sdp = GFS2_SB(inode);
335 struct gfs2_inode *ip = GFS2_I(inode);
336 size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift;
337 int hint = min_t(size_t, INT_MAX, blks);
338
339 if (hint > atomic_read(&ip->i_res.rs_sizehint))
340 atomic_set(&ip->i_res.rs_sizehint, hint);
341}
342
343/**
344 * gfs2_allocate_page_backing - Use bmap to allocate blocks
345 * @page: The (locked) page to allocate backing for
346 *
347 * We try to allocate all the blocks required for the page in
348 * one go. This might fail for various reasons, so we keep
349 * trying until all the blocks to back this page are allocated.
350 * If some of the blocks are already allocated, thats ok too.
351 */
352
353static int gfs2_allocate_page_backing(struct page *page)
354{
355 struct inode *inode = page->mapping->host;
356 struct buffer_head bh;
357 unsigned long size = PAGE_SIZE;
358 u64 lblock = page->index << (PAGE_SHIFT - inode->i_blkbits);
359
360 do {
361 bh.b_state = 0;
362 bh.b_size = size;
363 gfs2_block_map(inode, lblock, &bh, 1);
364 if (!buffer_mapped(&bh))
365 return -EIO;
366 size -= bh.b_size;
367 lblock += (bh.b_size >> inode->i_blkbits);
368 } while(size > 0);
369 return 0;
370}
371
372/**
373 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
374 * @vma: The virtual memory area
375 * @vmf: The virtual memory fault containing the page to become writable
376 *
377 * When the page becomes writable, we need to ensure that we have
378 * blocks allocated on disk to back that page.
379 */
380
381static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
382{
383 struct page *page = vmf->page;
384 struct inode *inode = file_inode(vma->vm_file);
385 struct gfs2_inode *ip = GFS2_I(inode);
386 struct gfs2_sbd *sdp = GFS2_SB(inode);
387 struct gfs2_alloc_parms ap = { .aflags = 0, };
388 unsigned long last_index;
389 u64 pos = page->index << PAGE_SHIFT;
390 unsigned int data_blocks, ind_blocks, rblocks;
391 struct gfs2_holder gh;
392 loff_t size;
393 int ret;
394
395 sb_start_pagefault(inode->i_sb);
396
397 /* Update file times before taking page lock */
398 file_update_time(vma->vm_file);
399
400 ret = gfs2_rsqa_alloc(ip);
401 if (ret)
402 goto out;
403
404 gfs2_size_hint(vma->vm_file, pos, PAGE_SIZE);
405
406 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
407 ret = gfs2_glock_nq(&gh);
408 if (ret)
409 goto out_uninit;
410
411 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
412 set_bit(GIF_SW_PAGED, &ip->i_flags);
413
414 if (!gfs2_write_alloc_required(ip, pos, PAGE_SIZE)) {
415 lock_page(page);
416 if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
417 ret = -EAGAIN;
418 unlock_page(page);
419 }
420 goto out_unlock;
421 }
422
423 ret = gfs2_rindex_update(sdp);
424 if (ret)
425 goto out_unlock;
426
427 gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
428 ap.target = data_blocks + ind_blocks;
429 ret = gfs2_quota_lock_check(ip, &ap);
430 if (ret)
431 goto out_unlock;
432 ret = gfs2_inplace_reserve(ip, &ap);
433 if (ret)
434 goto out_quota_unlock;
435
436 rblocks = RES_DINODE + ind_blocks;
437 if (gfs2_is_jdata(ip))
438 rblocks += data_blocks ? data_blocks : 1;
439 if (ind_blocks || data_blocks) {
440 rblocks += RES_STATFS + RES_QUOTA;
441 rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
442 }
443 ret = gfs2_trans_begin(sdp, rblocks, 0);
444 if (ret)
445 goto out_trans_fail;
446
447 lock_page(page);
448 ret = -EINVAL;
449 size = i_size_read(inode);
450 last_index = (size - 1) >> PAGE_SHIFT;
451 /* Check page index against inode size */
452 if (size == 0 || (page->index > last_index))
453 goto out_trans_end;
454
455 ret = -EAGAIN;
456 /* If truncated, we must retry the operation, we may have raced
457 * with the glock demotion code.
458 */
459 if (!PageUptodate(page) || page->mapping != inode->i_mapping)
460 goto out_trans_end;
461
462 /* Unstuff, if required, and allocate backing blocks for page */
463 ret = 0;
464 if (gfs2_is_stuffed(ip))
465 ret = gfs2_unstuff_dinode(ip, page);
466 if (ret == 0)
467 ret = gfs2_allocate_page_backing(page);
468
469out_trans_end:
470 if (ret)
471 unlock_page(page);
472 gfs2_trans_end(sdp);
473out_trans_fail:
474 gfs2_inplace_release(ip);
475out_quota_unlock:
476 gfs2_quota_unlock(ip);
477out_unlock:
478 gfs2_glock_dq(&gh);
479out_uninit:
480 gfs2_holder_uninit(&gh);
481 if (ret == 0) {
482 set_page_dirty(page);
483 wait_for_stable_page(page);
484 }
485out:
486 sb_end_pagefault(inode->i_sb);
487 return block_page_mkwrite_return(ret);
488}
489
490static const struct vm_operations_struct gfs2_vm_ops = {
491 .fault = filemap_fault,
492 .map_pages = filemap_map_pages,
493 .page_mkwrite = gfs2_page_mkwrite,
494};
495
496/**
497 * gfs2_mmap -
498 * @file: The file to map
499 * @vma: The VMA which described the mapping
500 *
501 * There is no need to get a lock here unless we should be updating
502 * atime. We ignore any locking errors since the only consequence is
503 * a missed atime update (which will just be deferred until later).
504 *
505 * Returns: 0
506 */
507
508static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
509{
510 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
511
512 if (!(file->f_flags & O_NOATIME) &&
513 !IS_NOATIME(&ip->i_inode)) {
514 struct gfs2_holder i_gh;
515 int error;
516
517 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
518 &i_gh);
519 if (error)
520 return error;
521 /* grab lock to update inode */
522 gfs2_glock_dq_uninit(&i_gh);
523 file_accessed(file);
524 }
525 vma->vm_ops = &gfs2_vm_ops;
526
527 return 0;
528}
529
530/**
531 * gfs2_open_common - This is common to open and atomic_open
532 * @inode: The inode being opened
533 * @file: The file being opened
534 *
535 * This maybe called under a glock or not depending upon how it has
536 * been called. We must always be called under a glock for regular
537 * files, however. For other file types, it does not matter whether
538 * we hold the glock or not.
539 *
540 * Returns: Error code or 0 for success
541 */
542
543int gfs2_open_common(struct inode *inode, struct file *file)
544{
545 struct gfs2_file *fp;
546 int ret;
547
548 if (S_ISREG(inode->i_mode)) {
549 ret = generic_file_open(inode, file);
550 if (ret)
551 return ret;
552 }
553
554 fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS);
555 if (!fp)
556 return -ENOMEM;
557
558 mutex_init(&fp->f_fl_mutex);
559
560 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
561 file->private_data = fp;
562 return 0;
563}
564
565/**
566 * gfs2_open - open a file
567 * @inode: the inode to open
568 * @file: the struct file for this opening
569 *
570 * After atomic_open, this function is only used for opening files
571 * which are already cached. We must still get the glock for regular
572 * files to ensure that we have the file size uptodate for the large
573 * file check which is in the common code. That is only an issue for
574 * regular files though.
575 *
576 * Returns: errno
577 */
578
579static int gfs2_open(struct inode *inode, struct file *file)
580{
581 struct gfs2_inode *ip = GFS2_I(inode);
582 struct gfs2_holder i_gh;
583 int error;
584 bool need_unlock = false;
585
586 if (S_ISREG(ip->i_inode.i_mode)) {
587 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
588 &i_gh);
589 if (error)
590 return error;
591 need_unlock = true;
592 }
593
594 error = gfs2_open_common(inode, file);
595
596 if (need_unlock)
597 gfs2_glock_dq_uninit(&i_gh);
598
599 return error;
600}
601
602/**
603 * gfs2_release - called to close a struct file
604 * @inode: the inode the struct file belongs to
605 * @file: the struct file being closed
606 *
607 * Returns: errno
608 */
609
610static int gfs2_release(struct inode *inode, struct file *file)
611{
612 struct gfs2_inode *ip = GFS2_I(inode);
613
614 kfree(file->private_data);
615 file->private_data = NULL;
616
617 if (!(file->f_mode & FMODE_WRITE))
618 return 0;
619
620 gfs2_rsqa_delete(ip, &inode->i_writecount);
621 return 0;
622}
623
624/**
625 * gfs2_fsync - sync the dirty data for a file (across the cluster)
626 * @file: the file that points to the dentry
627 * @start: the start position in the file to sync
628 * @end: the end position in the file to sync
629 * @datasync: set if we can ignore timestamp changes
630 *
631 * We split the data flushing here so that we don't wait for the data
632 * until after we've also sent the metadata to disk. Note that for
633 * data=ordered, we will write & wait for the data at the log flush
634 * stage anyway, so this is unlikely to make much of a difference
635 * except in the data=writeback case.
636 *
637 * If the fdatawrite fails due to any reason except -EIO, we will
638 * continue the remainder of the fsync, although we'll still report
639 * the error at the end. This is to match filemap_write_and_wait_range()
640 * behaviour.
641 *
642 * Returns: errno
643 */
644
645static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
646 int datasync)
647{
648 struct address_space *mapping = file->f_mapping;
649 struct inode *inode = mapping->host;
650 int sync_state = inode->i_state & I_DIRTY_ALL;
651 struct gfs2_inode *ip = GFS2_I(inode);
652 int ret = 0, ret1 = 0;
653
654 if (mapping->nrpages) {
655 ret1 = filemap_fdatawrite_range(mapping, start, end);
656 if (ret1 == -EIO)
657 return ret1;
658 }
659
660 if (!gfs2_is_jdata(ip))
661 sync_state &= ~I_DIRTY_PAGES;
662 if (datasync)
663 sync_state &= ~(I_DIRTY_SYNC | I_DIRTY_TIME);
664
665 if (sync_state) {
666 ret = sync_inode_metadata(inode, 1);
667 if (ret)
668 return ret;
669 if (gfs2_is_jdata(ip))
670 filemap_write_and_wait(mapping);
671 gfs2_ail_flush(ip->i_gl, 1);
672 }
673
674 if (mapping->nrpages)
675 ret = filemap_fdatawait_range(mapping, start, end);
676
677 return ret ? ret : ret1;
678}
679
680/**
681 * gfs2_file_write_iter - Perform a write to a file
682 * @iocb: The io context
683 * @iov: The data to write
684 * @nr_segs: Number of @iov segments
685 * @pos: The file position
686 *
687 * We have to do a lock/unlock here to refresh the inode size for
688 * O_APPEND writes, otherwise we can land up writing at the wrong
689 * offset. There is still a race, but provided the app is using its
690 * own file locking, this will make O_APPEND work as expected.
691 *
692 */
693
694static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
695{
696 struct file *file = iocb->ki_filp;
697 struct gfs2_inode *ip = GFS2_I(file_inode(file));
698 int ret;
699
700 ret = gfs2_rsqa_alloc(ip);
701 if (ret)
702 return ret;
703
704 gfs2_size_hint(file, iocb->ki_pos, iov_iter_count(from));
705
706 if (iocb->ki_flags & IOCB_APPEND) {
707 struct gfs2_holder gh;
708
709 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
710 if (ret)
711 return ret;
712 gfs2_glock_dq_uninit(&gh);
713 }
714
715 return generic_file_write_iter(iocb, from);
716}
717
718static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
719 int mode)
720{
721 struct gfs2_inode *ip = GFS2_I(inode);
722 struct buffer_head *dibh;
723 int error;
724 unsigned int nr_blks;
725 sector_t lblock = offset >> inode->i_blkbits;
726
727 error = gfs2_meta_inode_buffer(ip, &dibh);
728 if (unlikely(error))
729 return error;
730
731 gfs2_trans_add_meta(ip->i_gl, dibh);
732
733 if (gfs2_is_stuffed(ip)) {
734 error = gfs2_unstuff_dinode(ip, NULL);
735 if (unlikely(error))
736 goto out;
737 }
738
739 while (len) {
740 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
741 bh_map.b_size = len;
742 set_buffer_zeronew(&bh_map);
743
744 error = gfs2_block_map(inode, lblock, &bh_map, 1);
745 if (unlikely(error))
746 goto out;
747 len -= bh_map.b_size;
748 nr_blks = bh_map.b_size >> inode->i_blkbits;
749 lblock += nr_blks;
750 if (!buffer_new(&bh_map))
751 continue;
752 if (unlikely(!buffer_zeronew(&bh_map))) {
753 error = -EIO;
754 goto out;
755 }
756 }
757out:
758 brelse(dibh);
759 return error;
760}
761/**
762 * calc_max_reserv() - Reverse of write_calc_reserv. Given a number of
763 * blocks, determine how many bytes can be written.
764 * @ip: The inode in question.
765 * @len: Max cap of bytes. What we return in *len must be <= this.
766 * @data_blocks: Compute and return the number of data blocks needed
767 * @ind_blocks: Compute and return the number of indirect blocks needed
768 * @max_blocks: The total blocks available to work with.
769 *
770 * Returns: void, but @len, @data_blocks and @ind_blocks are filled in.
771 */
772static void calc_max_reserv(struct gfs2_inode *ip, loff_t *len,
773 unsigned int *data_blocks, unsigned int *ind_blocks,
774 unsigned int max_blocks)
775{
776 loff_t max = *len;
777 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
778 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
779
780 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
781 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
782 max_data -= tmp;
783 }
784
785 *data_blocks = max_data;
786 *ind_blocks = max_blocks - max_data;
787 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
788 if (*len > max) {
789 *len = max;
790 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
791 }
792}
793
794static long __gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
795{
796 struct inode *inode = file_inode(file);
797 struct gfs2_sbd *sdp = GFS2_SB(inode);
798 struct gfs2_inode *ip = GFS2_I(inode);
799 struct gfs2_alloc_parms ap = { .aflags = 0, };
800 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
801 loff_t bytes, max_bytes, max_blks = UINT_MAX;
802 int error;
803 const loff_t pos = offset;
804 const loff_t count = len;
805 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
806 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
807 loff_t max_chunk_size = UINT_MAX & bsize_mask;
808
809 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
810
811 offset &= bsize_mask;
812
813 len = next - offset;
814 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
815 if (!bytes)
816 bytes = UINT_MAX;
817 bytes &= bsize_mask;
818 if (bytes == 0)
819 bytes = sdp->sd_sb.sb_bsize;
820
821 gfs2_size_hint(file, offset, len);
822
823 gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
824 ap.min_target = data_blocks + ind_blocks;
825
826 while (len > 0) {
827 if (len < bytes)
828 bytes = len;
829 if (!gfs2_write_alloc_required(ip, offset, bytes)) {
830 len -= bytes;
831 offset += bytes;
832 continue;
833 }
834
835 /* We need to determine how many bytes we can actually
836 * fallocate without exceeding quota or going over the
837 * end of the fs. We start off optimistically by assuming
838 * we can write max_bytes */
839 max_bytes = (len > max_chunk_size) ? max_chunk_size : len;
840
841 /* Since max_bytes is most likely a theoretical max, we
842 * calculate a more realistic 'bytes' to serve as a good
843 * starting point for the number of bytes we may be able
844 * to write */
845 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
846 ap.target = data_blocks + ind_blocks;
847
848 error = gfs2_quota_lock_check(ip, &ap);
849 if (error)
850 return error;
851 /* ap.allowed tells us how many blocks quota will allow
852 * us to write. Check if this reduces max_blks */
853 if (ap.allowed && ap.allowed < max_blks)
854 max_blks = ap.allowed;
855
856 error = gfs2_inplace_reserve(ip, &ap);
857 if (error)
858 goto out_qunlock;
859
860 /* check if the selected rgrp limits our max_blks further */
861 if (ap.allowed && ap.allowed < max_blks)
862 max_blks = ap.allowed;
863
864 /* Almost done. Calculate bytes that can be written using
865 * max_blks. We also recompute max_bytes, data_blocks and
866 * ind_blocks */
867 calc_max_reserv(ip, &max_bytes, &data_blocks,
868 &ind_blocks, max_blks);
869
870 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
871 RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks);
872 if (gfs2_is_jdata(ip))
873 rblocks += data_blocks ? data_blocks : 1;
874
875 error = gfs2_trans_begin(sdp, rblocks,
876 PAGE_SIZE/sdp->sd_sb.sb_bsize);
877 if (error)
878 goto out_trans_fail;
879
880 error = fallocate_chunk(inode, offset, max_bytes, mode);
881 gfs2_trans_end(sdp);
882
883 if (error)
884 goto out_trans_fail;
885
886 len -= max_bytes;
887 offset += max_bytes;
888 gfs2_inplace_release(ip);
889 gfs2_quota_unlock(ip);
890 }
891
892 if (!(mode & FALLOC_FL_KEEP_SIZE) && (pos + count) > inode->i_size) {
893 i_size_write(inode, pos + count);
894 file_update_time(file);
895 mark_inode_dirty(inode);
896 }
897
898 return generic_write_sync(file, pos, count);
899
900out_trans_fail:
901 gfs2_inplace_release(ip);
902out_qunlock:
903 gfs2_quota_unlock(ip);
904 return error;
905}
906
907static long gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
908{
909 struct inode *inode = file_inode(file);
910 struct gfs2_inode *ip = GFS2_I(inode);
911 struct gfs2_holder gh;
912 int ret;
913
914 if ((mode & ~FALLOC_FL_KEEP_SIZE) || gfs2_is_jdata(ip))
915 return -EOPNOTSUPP;
916
917 inode_lock(inode);
918
919 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
920 ret = gfs2_glock_nq(&gh);
921 if (ret)
922 goto out_uninit;
923
924 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
925 (offset + len) > inode->i_size) {
926 ret = inode_newsize_ok(inode, offset + len);
927 if (ret)
928 goto out_unlock;
929 }
930
931 ret = get_write_access(inode);
932 if (ret)
933 goto out_unlock;
934
935 ret = gfs2_rsqa_alloc(ip);
936 if (ret)
937 goto out_putw;
938
939 ret = __gfs2_fallocate(file, mode, offset, len);
940 if (ret)
941 gfs2_rs_deltree(&ip->i_res);
942
943out_putw:
944 put_write_access(inode);
945out_unlock:
946 gfs2_glock_dq(&gh);
947out_uninit:
948 gfs2_holder_uninit(&gh);
949 inode_unlock(inode);
950 return ret;
951}
952
953static ssize_t gfs2_file_splice_write(struct pipe_inode_info *pipe,
954 struct file *out, loff_t *ppos,
955 size_t len, unsigned int flags)
956{
957 int error;
958 struct gfs2_inode *ip = GFS2_I(out->f_mapping->host);
959
960 error = gfs2_rsqa_alloc(ip);
961 if (error)
962 return (ssize_t)error;
963
964 gfs2_size_hint(out, *ppos, len);
965
966 return iter_file_splice_write(pipe, out, ppos, len, flags);
967}
968
969#ifdef CONFIG_GFS2_FS_LOCKING_DLM
970
971/**
972 * gfs2_lock - acquire/release a posix lock on a file
973 * @file: the file pointer
974 * @cmd: either modify or retrieve lock state, possibly wait
975 * @fl: type and range of lock
976 *
977 * Returns: errno
978 */
979
980static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
981{
982 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
983 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
984 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
985
986 if (!(fl->fl_flags & FL_POSIX))
987 return -ENOLCK;
988 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
989 return -ENOLCK;
990
991 if (cmd == F_CANCELLK) {
992 /* Hack: */
993 cmd = F_SETLK;
994 fl->fl_type = F_UNLCK;
995 }
996 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) {
997 if (fl->fl_type == F_UNLCK)
998 locks_lock_file_wait(file, fl);
999 return -EIO;
1000 }
1001 if (IS_GETLK(cmd))
1002 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
1003 else if (fl->fl_type == F_UNLCK)
1004 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
1005 else
1006 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
1007}
1008
1009static int do_flock(struct file *file, int cmd, struct file_lock *fl)
1010{
1011 struct gfs2_file *fp = file->private_data;
1012 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1013 struct gfs2_inode *ip = GFS2_I(file_inode(file));
1014 struct gfs2_glock *gl;
1015 unsigned int state;
1016 u16 flags;
1017 int error = 0;
1018 int sleeptime;
1019
1020 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
1021 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY_1CB) | GL_EXACT;
1022
1023 mutex_lock(&fp->f_fl_mutex);
1024
1025 gl = fl_gh->gh_gl;
1026 if (gl) {
1027 if (fl_gh->gh_state == state)
1028 goto out;
1029 locks_lock_file_wait(file,
1030 &(struct file_lock) {
1031 .fl_type = F_UNLCK,
1032 .fl_flags = FL_FLOCK
1033 });
1034 gfs2_glock_dq(fl_gh);
1035 gfs2_holder_reinit(state, flags, fl_gh);
1036 } else {
1037 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
1038 &gfs2_flock_glops, CREATE, &gl);
1039 if (error)
1040 goto out;
1041 gfs2_holder_init(gl, state, flags, fl_gh);
1042 gfs2_glock_put(gl);
1043 }
1044 for (sleeptime = 1; sleeptime <= 4; sleeptime <<= 1) {
1045 error = gfs2_glock_nq(fl_gh);
1046 if (error != GLR_TRYFAILED)
1047 break;
1048 fl_gh->gh_flags = LM_FLAG_TRY | GL_EXACT;
1049 fl_gh->gh_error = 0;
1050 msleep(sleeptime);
1051 }
1052 if (error) {
1053 gfs2_holder_uninit(fl_gh);
1054 if (error == GLR_TRYFAILED)
1055 error = -EAGAIN;
1056 } else {
1057 error = locks_lock_file_wait(file, fl);
1058 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1059 }
1060
1061out:
1062 mutex_unlock(&fp->f_fl_mutex);
1063 return error;
1064}
1065
1066static void do_unflock(struct file *file, struct file_lock *fl)
1067{
1068 struct gfs2_file *fp = file->private_data;
1069 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1070
1071 mutex_lock(&fp->f_fl_mutex);
1072 locks_lock_file_wait(file, fl);
1073 if (fl_gh->gh_gl) {
1074 gfs2_glock_dq(fl_gh);
1075 gfs2_holder_uninit(fl_gh);
1076 }
1077 mutex_unlock(&fp->f_fl_mutex);
1078}
1079
1080/**
1081 * gfs2_flock - acquire/release a flock lock on a file
1082 * @file: the file pointer
1083 * @cmd: either modify or retrieve lock state, possibly wait
1084 * @fl: type and range of lock
1085 *
1086 * Returns: errno
1087 */
1088
1089static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
1090{
1091 if (!(fl->fl_flags & FL_FLOCK))
1092 return -ENOLCK;
1093 if (fl->fl_type & LOCK_MAND)
1094 return -EOPNOTSUPP;
1095
1096 if (fl->fl_type == F_UNLCK) {
1097 do_unflock(file, fl);
1098 return 0;
1099 } else {
1100 return do_flock(file, cmd, fl);
1101 }
1102}
1103
1104const struct file_operations gfs2_file_fops = {
1105 .llseek = gfs2_llseek,
1106 .read_iter = generic_file_read_iter,
1107 .write_iter = gfs2_file_write_iter,
1108 .unlocked_ioctl = gfs2_ioctl,
1109 .mmap = gfs2_mmap,
1110 .open = gfs2_open,
1111 .release = gfs2_release,
1112 .fsync = gfs2_fsync,
1113 .lock = gfs2_lock,
1114 .flock = gfs2_flock,
1115 .splice_read = generic_file_splice_read,
1116 .splice_write = gfs2_file_splice_write,
1117 .setlease = simple_nosetlease,
1118 .fallocate = gfs2_fallocate,
1119};
1120
1121const struct file_operations gfs2_dir_fops = {
1122 .iterate = gfs2_readdir,
1123 .unlocked_ioctl = gfs2_ioctl,
1124 .open = gfs2_open,
1125 .release = gfs2_release,
1126 .fsync = gfs2_fsync,
1127 .lock = gfs2_lock,
1128 .flock = gfs2_flock,
1129 .llseek = default_llseek,
1130};
1131
1132#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
1133
1134const struct file_operations gfs2_file_fops_nolock = {
1135 .llseek = gfs2_llseek,
1136 .read_iter = generic_file_read_iter,
1137 .write_iter = gfs2_file_write_iter,
1138 .unlocked_ioctl = gfs2_ioctl,
1139 .mmap = gfs2_mmap,
1140 .open = gfs2_open,
1141 .release = gfs2_release,
1142 .fsync = gfs2_fsync,
1143 .splice_read = generic_file_splice_read,
1144 .splice_write = gfs2_file_splice_write,
1145 .setlease = generic_setlease,
1146 .fallocate = gfs2_fallocate,
1147};
1148
1149const struct file_operations gfs2_dir_fops_nolock = {
1150 .iterate = gfs2_readdir,
1151 .unlocked_ioctl = gfs2_ioctl,
1152 .open = gfs2_open,
1153 .release = gfs2_release,
1154 .fsync = gfs2_fsync,
1155 .llseek = default_llseek,
1156};
1157