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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/ext2_fs.h>
22#include <linux/falloc.h>
23#include <linux/swap.h>
24#include <linux/crc32.h>
25#include <linux/writeback.h>
26#include <asm/uaccess.h>
27#include <linux/dlm.h>
28#include <linux/dlm_plock.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 * @origin: 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 origin)
57{
58 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
59 struct gfs2_holder i_gh;
60 loff_t error;
61
62 if (origin == 2) {
63 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
64 &i_gh);
65 if (!error) {
66 error = generic_file_llseek_unlocked(file, offset, origin);
67 gfs2_glock_dq_uninit(&i_gh);
68 }
69 } else
70 error = generic_file_llseek_unlocked(file, offset, origin);
71
72 return error;
73}
74
75/**
76 * gfs2_readdir - Read directory entries from a directory
77 * @file: The directory to read from
78 * @dirent: Buffer for dirents
79 * @filldir: Function used to do the copying
80 *
81 * Returns: errno
82 */
83
84static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir)
85{
86 struct inode *dir = file->f_mapping->host;
87 struct gfs2_inode *dip = GFS2_I(dir);
88 struct gfs2_holder d_gh;
89 u64 offset = file->f_pos;
90 int error;
91
92 gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
93 error = gfs2_glock_nq(&d_gh);
94 if (error) {
95 gfs2_holder_uninit(&d_gh);
96 return error;
97 }
98
99 error = gfs2_dir_read(dir, &offset, dirent, filldir);
100
101 gfs2_glock_dq_uninit(&d_gh);
102
103 file->f_pos = offset;
104
105 return error;
106}
107
108/**
109 * fsflags_cvt
110 * @table: A table of 32 u32 flags
111 * @val: a 32 bit value to convert
112 *
113 * This function can be used to convert between fsflags values and
114 * GFS2's own flags values.
115 *
116 * Returns: the converted flags
117 */
118static u32 fsflags_cvt(const u32 *table, u32 val)
119{
120 u32 res = 0;
121 while(val) {
122 if (val & 1)
123 res |= *table;
124 table++;
125 val >>= 1;
126 }
127 return res;
128}
129
130static const u32 fsflags_to_gfs2[32] = {
131 [3] = GFS2_DIF_SYNC,
132 [4] = GFS2_DIF_IMMUTABLE,
133 [5] = GFS2_DIF_APPENDONLY,
134 [7] = GFS2_DIF_NOATIME,
135 [12] = GFS2_DIF_EXHASH,
136 [14] = GFS2_DIF_INHERIT_JDATA,
137};
138
139static const u32 gfs2_to_fsflags[32] = {
140 [gfs2fl_Sync] = FS_SYNC_FL,
141 [gfs2fl_Immutable] = FS_IMMUTABLE_FL,
142 [gfs2fl_AppendOnly] = FS_APPEND_FL,
143 [gfs2fl_NoAtime] = FS_NOATIME_FL,
144 [gfs2fl_ExHash] = FS_INDEX_FL,
145 [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
146};
147
148static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
149{
150 struct inode *inode = filp->f_path.dentry->d_inode;
151 struct gfs2_inode *ip = GFS2_I(inode);
152 struct gfs2_holder gh;
153 int error;
154 u32 fsflags;
155
156 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
157 error = gfs2_glock_nq(&gh);
158 if (error)
159 return error;
160
161 fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags);
162 if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA)
163 fsflags |= FS_JOURNAL_DATA_FL;
164 if (put_user(fsflags, ptr))
165 error = -EFAULT;
166
167 gfs2_glock_dq(&gh);
168 gfs2_holder_uninit(&gh);
169 return error;
170}
171
172void gfs2_set_inode_flags(struct inode *inode)
173{
174 struct gfs2_inode *ip = GFS2_I(inode);
175 unsigned int flags = inode->i_flags;
176
177 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC);
178 if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode))
179 inode->i_flags |= S_NOSEC;
180 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
181 flags |= S_IMMUTABLE;
182 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
183 flags |= S_APPEND;
184 if (ip->i_diskflags & GFS2_DIF_NOATIME)
185 flags |= S_NOATIME;
186 if (ip->i_diskflags & GFS2_DIF_SYNC)
187 flags |= S_SYNC;
188 inode->i_flags = flags;
189}
190
191/* Flags that can be set by user space */
192#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
193 GFS2_DIF_IMMUTABLE| \
194 GFS2_DIF_APPENDONLY| \
195 GFS2_DIF_NOATIME| \
196 GFS2_DIF_SYNC| \
197 GFS2_DIF_SYSTEM| \
198 GFS2_DIF_INHERIT_JDATA)
199
200/**
201 * gfs2_set_flags - set flags on an inode
202 * @inode: The inode
203 * @flags: The flags to set
204 * @mask: Indicates which flags are valid
205 *
206 */
207static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
208{
209 struct inode *inode = filp->f_path.dentry->d_inode;
210 struct gfs2_inode *ip = GFS2_I(inode);
211 struct gfs2_sbd *sdp = GFS2_SB(inode);
212 struct buffer_head *bh;
213 struct gfs2_holder gh;
214 int error;
215 u32 new_flags, flags;
216
217 error = mnt_want_write(filp->f_path.mnt);
218 if (error)
219 return error;
220
221 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
222 if (error)
223 goto out_drop_write;
224
225 error = -EACCES;
226 if (!inode_owner_or_capable(inode))
227 goto out;
228
229 error = 0;
230 flags = ip->i_diskflags;
231 new_flags = (flags & ~mask) | (reqflags & mask);
232 if ((new_flags ^ flags) == 0)
233 goto out;
234
235 error = -EINVAL;
236 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
237 goto out;
238
239 error = -EPERM;
240 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
241 goto out;
242 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
243 goto out;
244 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
245 !capable(CAP_LINUX_IMMUTABLE))
246 goto out;
247 if (!IS_IMMUTABLE(inode)) {
248 error = gfs2_permission(inode, MAY_WRITE);
249 if (error)
250 goto out;
251 }
252 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
253 if (flags & GFS2_DIF_JDATA)
254 gfs2_log_flush(sdp, ip->i_gl);
255 error = filemap_fdatawrite(inode->i_mapping);
256 if (error)
257 goto out;
258 error = filemap_fdatawait(inode->i_mapping);
259 if (error)
260 goto out;
261 }
262 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
263 if (error)
264 goto out;
265 error = gfs2_meta_inode_buffer(ip, &bh);
266 if (error)
267 goto out_trans_end;
268 gfs2_trans_add_bh(ip->i_gl, bh, 1);
269 ip->i_diskflags = new_flags;
270 gfs2_dinode_out(ip, bh->b_data);
271 brelse(bh);
272 gfs2_set_inode_flags(inode);
273 gfs2_set_aops(inode);
274out_trans_end:
275 gfs2_trans_end(sdp);
276out:
277 gfs2_glock_dq_uninit(&gh);
278out_drop_write:
279 mnt_drop_write(filp->f_path.mnt);
280 return error;
281}
282
283static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
284{
285 struct inode *inode = filp->f_path.dentry->d_inode;
286 u32 fsflags, gfsflags;
287
288 if (get_user(fsflags, ptr))
289 return -EFAULT;
290
291 gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
292 if (!S_ISDIR(inode->i_mode)) {
293 if (gfsflags & GFS2_DIF_INHERIT_JDATA)
294 gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);
295 return do_gfs2_set_flags(filp, gfsflags, ~0);
296 }
297 return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA);
298}
299
300static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
301{
302 switch(cmd) {
303 case FS_IOC_GETFLAGS:
304 return gfs2_get_flags(filp, (u32 __user *)arg);
305 case FS_IOC_SETFLAGS:
306 return gfs2_set_flags(filp, (u32 __user *)arg);
307 }
308 return -ENOTTY;
309}
310
311/**
312 * gfs2_allocate_page_backing - Use bmap to allocate blocks
313 * @page: The (locked) page to allocate backing for
314 *
315 * We try to allocate all the blocks required for the page in
316 * one go. This might fail for various reasons, so we keep
317 * trying until all the blocks to back this page are allocated.
318 * If some of the blocks are already allocated, thats ok too.
319 */
320
321static int gfs2_allocate_page_backing(struct page *page)
322{
323 struct inode *inode = page->mapping->host;
324 struct buffer_head bh;
325 unsigned long size = PAGE_CACHE_SIZE;
326 u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
327
328 do {
329 bh.b_state = 0;
330 bh.b_size = size;
331 gfs2_block_map(inode, lblock, &bh, 1);
332 if (!buffer_mapped(&bh))
333 return -EIO;
334 size -= bh.b_size;
335 lblock += (bh.b_size >> inode->i_blkbits);
336 } while(size > 0);
337 return 0;
338}
339
340/**
341 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
342 * @vma: The virtual memory area
343 * @page: The page which is about to become writable
344 *
345 * When the page becomes writable, we need to ensure that we have
346 * blocks allocated on disk to back that page.
347 */
348
349static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
350{
351 struct page *page = vmf->page;
352 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
353 struct gfs2_inode *ip = GFS2_I(inode);
354 struct gfs2_sbd *sdp = GFS2_SB(inode);
355 unsigned long last_index;
356 u64 pos = page->index << PAGE_CACHE_SHIFT;
357 unsigned int data_blocks, ind_blocks, rblocks;
358 struct gfs2_holder gh;
359 struct gfs2_alloc *al;
360 int ret;
361
362 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
363 ret = gfs2_glock_nq(&gh);
364 if (ret)
365 goto out;
366
367 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
368 set_bit(GIF_SW_PAGED, &ip->i_flags);
369
370 if (!gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE))
371 goto out_unlock;
372 ret = -ENOMEM;
373 al = gfs2_alloc_get(ip);
374 if (al == NULL)
375 goto out_unlock;
376
377 ret = gfs2_quota_lock_check(ip);
378 if (ret)
379 goto out_alloc_put;
380 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
381 al->al_requested = data_blocks + ind_blocks;
382 ret = gfs2_inplace_reserve(ip);
383 if (ret)
384 goto out_quota_unlock;
385
386 rblocks = RES_DINODE + ind_blocks;
387 if (gfs2_is_jdata(ip))
388 rblocks += data_blocks ? data_blocks : 1;
389 if (ind_blocks || data_blocks) {
390 rblocks += RES_STATFS + RES_QUOTA;
391 rblocks += gfs2_rg_blocks(al);
392 }
393 ret = gfs2_trans_begin(sdp, rblocks, 0);
394 if (ret)
395 goto out_trans_fail;
396
397 lock_page(page);
398 ret = -EINVAL;
399 last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT;
400 if (page->index > last_index)
401 goto out_unlock_page;
402 ret = 0;
403 if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping)
404 goto out_unlock_page;
405 if (gfs2_is_stuffed(ip)) {
406 ret = gfs2_unstuff_dinode(ip, page);
407 if (ret)
408 goto out_unlock_page;
409 }
410 ret = gfs2_allocate_page_backing(page);
411
412out_unlock_page:
413 unlock_page(page);
414 gfs2_trans_end(sdp);
415out_trans_fail:
416 gfs2_inplace_release(ip);
417out_quota_unlock:
418 gfs2_quota_unlock(ip);
419out_alloc_put:
420 gfs2_alloc_put(ip);
421out_unlock:
422 gfs2_glock_dq(&gh);
423out:
424 gfs2_holder_uninit(&gh);
425 if (ret == -ENOMEM)
426 ret = VM_FAULT_OOM;
427 else if (ret)
428 ret = VM_FAULT_SIGBUS;
429 return ret;
430}
431
432static const struct vm_operations_struct gfs2_vm_ops = {
433 .fault = filemap_fault,
434 .page_mkwrite = gfs2_page_mkwrite,
435};
436
437/**
438 * gfs2_mmap -
439 * @file: The file to map
440 * @vma: The VMA which described the mapping
441 *
442 * There is no need to get a lock here unless we should be updating
443 * atime. We ignore any locking errors since the only consequence is
444 * a missed atime update (which will just be deferred until later).
445 *
446 * Returns: 0
447 */
448
449static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
450{
451 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
452
453 if (!(file->f_flags & O_NOATIME) &&
454 !IS_NOATIME(&ip->i_inode)) {
455 struct gfs2_holder i_gh;
456 int error;
457
458 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
459 error = gfs2_glock_nq(&i_gh);
460 if (error == 0) {
461 file_accessed(file);
462 gfs2_glock_dq(&i_gh);
463 }
464 gfs2_holder_uninit(&i_gh);
465 if (error)
466 return error;
467 }
468 vma->vm_ops = &gfs2_vm_ops;
469 vma->vm_flags |= VM_CAN_NONLINEAR;
470
471 return 0;
472}
473
474/**
475 * gfs2_open - open a file
476 * @inode: the inode to open
477 * @file: the struct file for this opening
478 *
479 * Returns: errno
480 */
481
482static int gfs2_open(struct inode *inode, struct file *file)
483{
484 struct gfs2_inode *ip = GFS2_I(inode);
485 struct gfs2_holder i_gh;
486 struct gfs2_file *fp;
487 int error;
488
489 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
490 if (!fp)
491 return -ENOMEM;
492
493 mutex_init(&fp->f_fl_mutex);
494
495 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
496 file->private_data = fp;
497
498 if (S_ISREG(ip->i_inode.i_mode)) {
499 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
500 &i_gh);
501 if (error)
502 goto fail;
503
504 if (!(file->f_flags & O_LARGEFILE) &&
505 i_size_read(inode) > MAX_NON_LFS) {
506 error = -EOVERFLOW;
507 goto fail_gunlock;
508 }
509
510 gfs2_glock_dq_uninit(&i_gh);
511 }
512
513 return 0;
514
515fail_gunlock:
516 gfs2_glock_dq_uninit(&i_gh);
517fail:
518 file->private_data = NULL;
519 kfree(fp);
520 return error;
521}
522
523/**
524 * gfs2_close - called to close a struct file
525 * @inode: the inode the struct file belongs to
526 * @file: the struct file being closed
527 *
528 * Returns: errno
529 */
530
531static int gfs2_close(struct inode *inode, struct file *file)
532{
533 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
534 struct gfs2_file *fp;
535
536 fp = file->private_data;
537 file->private_data = NULL;
538
539 if (gfs2_assert_warn(sdp, fp))
540 return -EIO;
541
542 kfree(fp);
543
544 return 0;
545}
546
547/**
548 * gfs2_fsync - sync the dirty data for a file (across the cluster)
549 * @file: the file that points to the dentry
550 * @start: the start position in the file to sync
551 * @end: the end position in the file to sync
552 * @datasync: set if we can ignore timestamp changes
553 *
554 * The VFS will flush data for us. We only need to worry
555 * about metadata here.
556 *
557 * Returns: errno
558 */
559
560static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
561 int datasync)
562{
563 struct inode *inode = file->f_mapping->host;
564 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
565 struct gfs2_inode *ip = GFS2_I(inode);
566 int ret;
567
568 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
569 if (ret)
570 return ret;
571 mutex_lock(&inode->i_mutex);
572
573 if (datasync)
574 sync_state &= ~I_DIRTY_SYNC;
575
576 if (sync_state) {
577 ret = sync_inode_metadata(inode, 1);
578 if (ret) {
579 mutex_unlock(&inode->i_mutex);
580 return ret;
581 }
582 gfs2_ail_flush(ip->i_gl);
583 }
584
585 mutex_unlock(&inode->i_mutex);
586 return 0;
587}
588
589/**
590 * gfs2_file_aio_write - Perform a write to a file
591 * @iocb: The io context
592 * @iov: The data to write
593 * @nr_segs: Number of @iov segments
594 * @pos: The file position
595 *
596 * We have to do a lock/unlock here to refresh the inode size for
597 * O_APPEND writes, otherwise we can land up writing at the wrong
598 * offset. There is still a race, but provided the app is using its
599 * own file locking, this will make O_APPEND work as expected.
600 *
601 */
602
603static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
604 unsigned long nr_segs, loff_t pos)
605{
606 struct file *file = iocb->ki_filp;
607
608 if (file->f_flags & O_APPEND) {
609 struct dentry *dentry = file->f_dentry;
610 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
611 struct gfs2_holder gh;
612 int ret;
613
614 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
615 if (ret)
616 return ret;
617 gfs2_glock_dq_uninit(&gh);
618 }
619
620 return generic_file_aio_write(iocb, iov, nr_segs, pos);
621}
622
623static int empty_write_end(struct page *page, unsigned from,
624 unsigned to, int mode)
625{
626 struct inode *inode = page->mapping->host;
627 struct gfs2_inode *ip = GFS2_I(inode);
628 struct buffer_head *bh;
629 unsigned offset, blksize = 1 << inode->i_blkbits;
630 pgoff_t end_index = i_size_read(inode) >> PAGE_CACHE_SHIFT;
631
632 zero_user(page, from, to-from);
633 mark_page_accessed(page);
634
635 if (page->index < end_index || !(mode & FALLOC_FL_KEEP_SIZE)) {
636 if (!gfs2_is_writeback(ip))
637 gfs2_page_add_databufs(ip, page, from, to);
638
639 block_commit_write(page, from, to);
640 return 0;
641 }
642
643 offset = 0;
644 bh = page_buffers(page);
645 while (offset < to) {
646 if (offset >= from) {
647 set_buffer_uptodate(bh);
648 mark_buffer_dirty(bh);
649 clear_buffer_new(bh);
650 write_dirty_buffer(bh, WRITE);
651 }
652 offset += blksize;
653 bh = bh->b_this_page;
654 }
655
656 offset = 0;
657 bh = page_buffers(page);
658 while (offset < to) {
659 if (offset >= from) {
660 wait_on_buffer(bh);
661 if (!buffer_uptodate(bh))
662 return -EIO;
663 }
664 offset += blksize;
665 bh = bh->b_this_page;
666 }
667 return 0;
668}
669
670static int needs_empty_write(sector_t block, struct inode *inode)
671{
672 int error;
673 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
674
675 bh_map.b_size = 1 << inode->i_blkbits;
676 error = gfs2_block_map(inode, block, &bh_map, 0);
677 if (unlikely(error))
678 return error;
679 return !buffer_mapped(&bh_map);
680}
681
682static int write_empty_blocks(struct page *page, unsigned from, unsigned to,
683 int mode)
684{
685 struct inode *inode = page->mapping->host;
686 unsigned start, end, next, blksize;
687 sector_t block = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
688 int ret;
689
690 blksize = 1 << inode->i_blkbits;
691 next = end = 0;
692 while (next < from) {
693 next += blksize;
694 block++;
695 }
696 start = next;
697 do {
698 next += blksize;
699 ret = needs_empty_write(block, inode);
700 if (unlikely(ret < 0))
701 return ret;
702 if (ret == 0) {
703 if (end) {
704 ret = __block_write_begin(page, start, end - start,
705 gfs2_block_map);
706 if (unlikely(ret))
707 return ret;
708 ret = empty_write_end(page, start, end, mode);
709 if (unlikely(ret))
710 return ret;
711 end = 0;
712 }
713 start = next;
714 }
715 else
716 end = next;
717 block++;
718 } while (next < to);
719
720 if (end) {
721 ret = __block_write_begin(page, start, end - start, gfs2_block_map);
722 if (unlikely(ret))
723 return ret;
724 ret = empty_write_end(page, start, end, mode);
725 if (unlikely(ret))
726 return ret;
727 }
728
729 return 0;
730}
731
732static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
733 int mode)
734{
735 struct gfs2_inode *ip = GFS2_I(inode);
736 struct buffer_head *dibh;
737 int error;
738 u64 start = offset >> PAGE_CACHE_SHIFT;
739 unsigned int start_offset = offset & ~PAGE_CACHE_MASK;
740 u64 end = (offset + len - 1) >> PAGE_CACHE_SHIFT;
741 pgoff_t curr;
742 struct page *page;
743 unsigned int end_offset = (offset + len) & ~PAGE_CACHE_MASK;
744 unsigned int from, to;
745
746 if (!end_offset)
747 end_offset = PAGE_CACHE_SIZE;
748
749 error = gfs2_meta_inode_buffer(ip, &dibh);
750 if (unlikely(error))
751 goto out;
752
753 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
754
755 if (gfs2_is_stuffed(ip)) {
756 error = gfs2_unstuff_dinode(ip, NULL);
757 if (unlikely(error))
758 goto out;
759 }
760
761 curr = start;
762 offset = start << PAGE_CACHE_SHIFT;
763 from = start_offset;
764 to = PAGE_CACHE_SIZE;
765 while (curr <= end) {
766 page = grab_cache_page_write_begin(inode->i_mapping, curr,
767 AOP_FLAG_NOFS);
768 if (unlikely(!page)) {
769 error = -ENOMEM;
770 goto out;
771 }
772
773 if (curr == end)
774 to = end_offset;
775 error = write_empty_blocks(page, from, to, mode);
776 if (!error && offset + to > inode->i_size &&
777 !(mode & FALLOC_FL_KEEP_SIZE)) {
778 i_size_write(inode, offset + to);
779 }
780 unlock_page(page);
781 page_cache_release(page);
782 if (error)
783 goto out;
784 curr++;
785 offset += PAGE_CACHE_SIZE;
786 from = 0;
787 }
788
789 gfs2_dinode_out(ip, dibh->b_data);
790 mark_inode_dirty(inode);
791
792 brelse(dibh);
793
794out:
795 return error;
796}
797
798static void calc_max_reserv(struct gfs2_inode *ip, loff_t max, loff_t *len,
799 unsigned int *data_blocks, unsigned int *ind_blocks)
800{
801 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
802 unsigned int max_blocks = ip->i_alloc->al_rgd->rd_free_clone;
803 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
804
805 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
806 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
807 max_data -= tmp;
808 }
809 /* This calculation isn't the exact reverse of gfs2_write_calc_reserve,
810 so it might end up with fewer data blocks */
811 if (max_data <= *data_blocks)
812 return;
813 *data_blocks = max_data;
814 *ind_blocks = max_blocks - max_data;
815 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
816 if (*len > max) {
817 *len = max;
818 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
819 }
820}
821
822static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
823 loff_t len)
824{
825 struct inode *inode = file->f_path.dentry->d_inode;
826 struct gfs2_sbd *sdp = GFS2_SB(inode);
827 struct gfs2_inode *ip = GFS2_I(inode);
828 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
829 loff_t bytes, max_bytes;
830 struct gfs2_alloc *al;
831 int error;
832 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
833 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
834 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
835
836 /* We only support the FALLOC_FL_KEEP_SIZE mode */
837 if (mode & ~FALLOC_FL_KEEP_SIZE)
838 return -EOPNOTSUPP;
839
840 offset &= bsize_mask;
841
842 len = next - offset;
843 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
844 if (!bytes)
845 bytes = UINT_MAX;
846 bytes &= bsize_mask;
847 if (bytes == 0)
848 bytes = sdp->sd_sb.sb_bsize;
849
850 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
851 error = gfs2_glock_nq(&ip->i_gh);
852 if (unlikely(error))
853 goto out_uninit;
854
855 if (!gfs2_write_alloc_required(ip, offset, len))
856 goto out_unlock;
857
858 while (len > 0) {
859 if (len < bytes)
860 bytes = len;
861 al = gfs2_alloc_get(ip);
862 if (!al) {
863 error = -ENOMEM;
864 goto out_unlock;
865 }
866
867 error = gfs2_quota_lock_check(ip);
868 if (error)
869 goto out_alloc_put;
870
871retry:
872 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
873
874 al->al_requested = data_blocks + ind_blocks;
875 error = gfs2_inplace_reserve(ip);
876 if (error) {
877 if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) {
878 bytes >>= 1;
879 bytes &= bsize_mask;
880 if (bytes == 0)
881 bytes = sdp->sd_sb.sb_bsize;
882 goto retry;
883 }
884 goto out_qunlock;
885 }
886 max_bytes = bytes;
887 calc_max_reserv(ip, len, &max_bytes, &data_blocks, &ind_blocks);
888 al->al_requested = data_blocks + ind_blocks;
889
890 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
891 RES_RG_HDR + gfs2_rg_blocks(al);
892 if (gfs2_is_jdata(ip))
893 rblocks += data_blocks ? data_blocks : 1;
894
895 error = gfs2_trans_begin(sdp, rblocks,
896 PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize);
897 if (error)
898 goto out_trans_fail;
899
900 error = fallocate_chunk(inode, offset, max_bytes, mode);
901 gfs2_trans_end(sdp);
902
903 if (error)
904 goto out_trans_fail;
905
906 len -= max_bytes;
907 offset += max_bytes;
908 gfs2_inplace_release(ip);
909 gfs2_quota_unlock(ip);
910 gfs2_alloc_put(ip);
911 }
912 goto out_unlock;
913
914out_trans_fail:
915 gfs2_inplace_release(ip);
916out_qunlock:
917 gfs2_quota_unlock(ip);
918out_alloc_put:
919 gfs2_alloc_put(ip);
920out_unlock:
921 gfs2_glock_dq(&ip->i_gh);
922out_uninit:
923 gfs2_holder_uninit(&ip->i_gh);
924 return error;
925}
926
927#ifdef CONFIG_GFS2_FS_LOCKING_DLM
928
929/**
930 * gfs2_setlease - acquire/release a file lease
931 * @file: the file pointer
932 * @arg: lease type
933 * @fl: file lock
934 *
935 * We don't currently have a way to enforce a lease across the whole
936 * cluster; until we do, disable leases (by just returning -EINVAL),
937 * unless the administrator has requested purely local locking.
938 *
939 * Locking: called under lock_flocks
940 *
941 * Returns: errno
942 */
943
944static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
945{
946 return -EINVAL;
947}
948
949/**
950 * gfs2_lock - acquire/release a posix lock on a file
951 * @file: the file pointer
952 * @cmd: either modify or retrieve lock state, possibly wait
953 * @fl: type and range of lock
954 *
955 * Returns: errno
956 */
957
958static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
959{
960 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
961 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
962 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
963
964 if (!(fl->fl_flags & FL_POSIX))
965 return -ENOLCK;
966 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
967 return -ENOLCK;
968
969 if (cmd == F_CANCELLK) {
970 /* Hack: */
971 cmd = F_SETLK;
972 fl->fl_type = F_UNLCK;
973 }
974 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
975 return -EIO;
976 if (IS_GETLK(cmd))
977 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
978 else if (fl->fl_type == F_UNLCK)
979 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
980 else
981 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
982}
983
984static int do_flock(struct file *file, int cmd, struct file_lock *fl)
985{
986 struct gfs2_file *fp = file->private_data;
987 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
988 struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
989 struct gfs2_glock *gl;
990 unsigned int state;
991 int flags;
992 int error = 0;
993
994 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
995 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
996
997 mutex_lock(&fp->f_fl_mutex);
998
999 gl = fl_gh->gh_gl;
1000 if (gl) {
1001 if (fl_gh->gh_state == state)
1002 goto out;
1003 flock_lock_file_wait(file,
1004 &(struct file_lock){.fl_type = F_UNLCK});
1005 gfs2_glock_dq_wait(fl_gh);
1006 gfs2_holder_reinit(state, flags, fl_gh);
1007 } else {
1008 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
1009 &gfs2_flock_glops, CREATE, &gl);
1010 if (error)
1011 goto out;
1012 gfs2_holder_init(gl, state, flags, fl_gh);
1013 gfs2_glock_put(gl);
1014 }
1015 error = gfs2_glock_nq(fl_gh);
1016 if (error) {
1017 gfs2_holder_uninit(fl_gh);
1018 if (error == GLR_TRYFAILED)
1019 error = -EAGAIN;
1020 } else {
1021 error = flock_lock_file_wait(file, fl);
1022 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1023 }
1024
1025out:
1026 mutex_unlock(&fp->f_fl_mutex);
1027 return error;
1028}
1029
1030static void do_unflock(struct file *file, struct file_lock *fl)
1031{
1032 struct gfs2_file *fp = file->private_data;
1033 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1034
1035 mutex_lock(&fp->f_fl_mutex);
1036 flock_lock_file_wait(file, fl);
1037 if (fl_gh->gh_gl) {
1038 gfs2_glock_dq_wait(fl_gh);
1039 gfs2_holder_uninit(fl_gh);
1040 }
1041 mutex_unlock(&fp->f_fl_mutex);
1042}
1043
1044/**
1045 * gfs2_flock - acquire/release a flock lock on a file
1046 * @file: the file pointer
1047 * @cmd: either modify or retrieve lock state, possibly wait
1048 * @fl: type and range of lock
1049 *
1050 * Returns: errno
1051 */
1052
1053static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
1054{
1055 if (!(fl->fl_flags & FL_FLOCK))
1056 return -ENOLCK;
1057 if (fl->fl_type & LOCK_MAND)
1058 return -EOPNOTSUPP;
1059
1060 if (fl->fl_type == F_UNLCK) {
1061 do_unflock(file, fl);
1062 return 0;
1063 } else {
1064 return do_flock(file, cmd, fl);
1065 }
1066}
1067
1068const struct file_operations gfs2_file_fops = {
1069 .llseek = gfs2_llseek,
1070 .read = do_sync_read,
1071 .aio_read = generic_file_aio_read,
1072 .write = do_sync_write,
1073 .aio_write = gfs2_file_aio_write,
1074 .unlocked_ioctl = gfs2_ioctl,
1075 .mmap = gfs2_mmap,
1076 .open = gfs2_open,
1077 .release = gfs2_close,
1078 .fsync = gfs2_fsync,
1079 .lock = gfs2_lock,
1080 .flock = gfs2_flock,
1081 .splice_read = generic_file_splice_read,
1082 .splice_write = generic_file_splice_write,
1083 .setlease = gfs2_setlease,
1084 .fallocate = gfs2_fallocate,
1085};
1086
1087const struct file_operations gfs2_dir_fops = {
1088 .readdir = gfs2_readdir,
1089 .unlocked_ioctl = gfs2_ioctl,
1090 .open = gfs2_open,
1091 .release = gfs2_close,
1092 .fsync = gfs2_fsync,
1093 .lock = gfs2_lock,
1094 .flock = gfs2_flock,
1095 .llseek = default_llseek,
1096};
1097
1098#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
1099
1100const struct file_operations gfs2_file_fops_nolock = {
1101 .llseek = gfs2_llseek,
1102 .read = do_sync_read,
1103 .aio_read = generic_file_aio_read,
1104 .write = do_sync_write,
1105 .aio_write = gfs2_file_aio_write,
1106 .unlocked_ioctl = gfs2_ioctl,
1107 .mmap = gfs2_mmap,
1108 .open = gfs2_open,
1109 .release = gfs2_close,
1110 .fsync = gfs2_fsync,
1111 .splice_read = generic_file_splice_read,
1112 .splice_write = generic_file_splice_write,
1113 .setlease = generic_setlease,
1114 .fallocate = gfs2_fallocate,
1115};
1116
1117const struct file_operations gfs2_dir_fops_nolock = {
1118 .readdir = gfs2_readdir,
1119 .unlocked_ioctl = gfs2_ioctl,
1120 .open = gfs2_open,
1121 .release = gfs2_close,
1122 .fsync = gfs2_fsync,
1123 .llseek = default_llseek,
1124};
1125
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/completion.h>
10#include <linux/buffer_head.h>
11#include <linux/pagemap.h>
12#include <linux/uio.h>
13#include <linux/blkdev.h>
14#include <linux/mm.h>
15#include <linux/mount.h>
16#include <linux/fs.h>
17#include <linux/gfs2_ondisk.h>
18#include <linux/falloc.h>
19#include <linux/swap.h>
20#include <linux/crc32.h>
21#include <linux/writeback.h>
22#include <linux/uaccess.h>
23#include <linux/dlm.h>
24#include <linux/dlm_plock.h>
25#include <linux/delay.h>
26#include <linux/backing-dev.h>
27
28#include "gfs2.h"
29#include "incore.h"
30#include "bmap.h"
31#include "aops.h"
32#include "dir.h"
33#include "glock.h"
34#include "glops.h"
35#include "inode.h"
36#include "log.h"
37#include "meta_io.h"
38#include "quota.h"
39#include "rgrp.h"
40#include "trans.h"
41#include "util.h"
42
43/**
44 * gfs2_llseek - seek to a location in a file
45 * @file: the file
46 * @offset: the offset
47 * @whence: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
48 *
49 * SEEK_END requires the glock for the file because it references the
50 * file's size.
51 *
52 * Returns: The new offset, or errno
53 */
54
55static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence)
56{
57 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
58 struct gfs2_holder i_gh;
59 loff_t error;
60
61 switch (whence) {
62 case SEEK_END:
63 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
64 &i_gh);
65 if (!error) {
66 error = generic_file_llseek(file, offset, whence);
67 gfs2_glock_dq_uninit(&i_gh);
68 }
69 break;
70
71 case SEEK_DATA:
72 error = gfs2_seek_data(file, offset);
73 break;
74
75 case SEEK_HOLE:
76 error = gfs2_seek_hole(file, offset);
77 break;
78
79 case SEEK_CUR:
80 case SEEK_SET:
81 /*
82 * These don't reference inode->i_size and don't depend on the
83 * block mapping, so we don't need the glock.
84 */
85 error = generic_file_llseek(file, offset, whence);
86 break;
87 default:
88 error = -EINVAL;
89 }
90
91 return error;
92}
93
94/**
95 * gfs2_readdir - Iterator for a directory
96 * @file: The directory to read from
97 * @ctx: What to feed directory entries to
98 *
99 * Returns: errno
100 */
101
102static int gfs2_readdir(struct file *file, struct dir_context *ctx)
103{
104 struct inode *dir = file->f_mapping->host;
105 struct gfs2_inode *dip = GFS2_I(dir);
106 struct gfs2_holder d_gh;
107 int error;
108
109 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
110 if (error)
111 return error;
112
113 error = gfs2_dir_read(dir, ctx, &file->f_ra);
114
115 gfs2_glock_dq_uninit(&d_gh);
116
117 return error;
118}
119
120/**
121 * fsflag_gfs2flag
122 *
123 * The FS_JOURNAL_DATA_FL flag maps to GFS2_DIF_INHERIT_JDATA for directories,
124 * and to GFS2_DIF_JDATA for non-directories.
125 */
126static struct {
127 u32 fsflag;
128 u32 gfsflag;
129} fsflag_gfs2flag[] = {
130 {FS_SYNC_FL, GFS2_DIF_SYNC},
131 {FS_IMMUTABLE_FL, GFS2_DIF_IMMUTABLE},
132 {FS_APPEND_FL, GFS2_DIF_APPENDONLY},
133 {FS_NOATIME_FL, GFS2_DIF_NOATIME},
134 {FS_INDEX_FL, GFS2_DIF_EXHASH},
135 {FS_TOPDIR_FL, GFS2_DIF_TOPDIR},
136 {FS_JOURNAL_DATA_FL, GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA},
137};
138
139static inline u32 gfs2_gfsflags_to_fsflags(struct inode *inode, u32 gfsflags)
140{
141 int i;
142 u32 fsflags = 0;
143
144 if (S_ISDIR(inode->i_mode))
145 gfsflags &= ~GFS2_DIF_JDATA;
146 else
147 gfsflags &= ~GFS2_DIF_INHERIT_JDATA;
148
149 for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++)
150 if (gfsflags & fsflag_gfs2flag[i].gfsflag)
151 fsflags |= fsflag_gfs2flag[i].fsflag;
152 return fsflags;
153}
154
155static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
156{
157 struct inode *inode = file_inode(filp);
158 struct gfs2_inode *ip = GFS2_I(inode);
159 struct gfs2_holder gh;
160 int error;
161 u32 fsflags;
162
163 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
164 error = gfs2_glock_nq(&gh);
165 if (error)
166 goto out_uninit;
167
168 fsflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags);
169
170 if (put_user(fsflags, ptr))
171 error = -EFAULT;
172
173 gfs2_glock_dq(&gh);
174out_uninit:
175 gfs2_holder_uninit(&gh);
176 return error;
177}
178
179void gfs2_set_inode_flags(struct inode *inode)
180{
181 struct gfs2_inode *ip = GFS2_I(inode);
182 unsigned int flags = inode->i_flags;
183
184 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC);
185 if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode))
186 flags |= S_NOSEC;
187 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
188 flags |= S_IMMUTABLE;
189 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
190 flags |= S_APPEND;
191 if (ip->i_diskflags & GFS2_DIF_NOATIME)
192 flags |= S_NOATIME;
193 if (ip->i_diskflags & GFS2_DIF_SYNC)
194 flags |= S_SYNC;
195 inode->i_flags = flags;
196}
197
198/* Flags that can be set by user space */
199#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
200 GFS2_DIF_IMMUTABLE| \
201 GFS2_DIF_APPENDONLY| \
202 GFS2_DIF_NOATIME| \
203 GFS2_DIF_SYNC| \
204 GFS2_DIF_TOPDIR| \
205 GFS2_DIF_INHERIT_JDATA)
206
207/**
208 * do_gfs2_set_flags - set flags on an inode
209 * @filp: file pointer
210 * @reqflags: The flags to set
211 * @mask: Indicates which flags are valid
212 * @fsflags: The FS_* inode flags passed in
213 *
214 */
215static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask,
216 const u32 fsflags)
217{
218 struct inode *inode = file_inode(filp);
219 struct gfs2_inode *ip = GFS2_I(inode);
220 struct gfs2_sbd *sdp = GFS2_SB(inode);
221 struct buffer_head *bh;
222 struct gfs2_holder gh;
223 int error;
224 u32 new_flags, flags, oldflags;
225
226 error = mnt_want_write_file(filp);
227 if (error)
228 return error;
229
230 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
231 if (error)
232 goto out_drop_write;
233
234 oldflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags);
235 error = vfs_ioc_setflags_prepare(inode, oldflags, fsflags);
236 if (error)
237 goto out;
238
239 error = -EACCES;
240 if (!inode_owner_or_capable(inode))
241 goto out;
242
243 error = 0;
244 flags = ip->i_diskflags;
245 new_flags = (flags & ~mask) | (reqflags & mask);
246 if ((new_flags ^ flags) == 0)
247 goto out;
248
249 error = -EPERM;
250 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
251 goto out;
252 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
253 goto out;
254 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
255 !capable(CAP_LINUX_IMMUTABLE))
256 goto out;
257 if (!IS_IMMUTABLE(inode)) {
258 error = gfs2_permission(inode, MAY_WRITE);
259 if (error)
260 goto out;
261 }
262 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
263 if (new_flags & GFS2_DIF_JDATA)
264 gfs2_log_flush(sdp, ip->i_gl,
265 GFS2_LOG_HEAD_FLUSH_NORMAL |
266 GFS2_LFC_SET_FLAGS);
267 error = filemap_fdatawrite(inode->i_mapping);
268 if (error)
269 goto out;
270 error = filemap_fdatawait(inode->i_mapping);
271 if (error)
272 goto out;
273 if (new_flags & GFS2_DIF_JDATA)
274 gfs2_ordered_del_inode(ip);
275 }
276 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
277 if (error)
278 goto out;
279 error = gfs2_meta_inode_buffer(ip, &bh);
280 if (error)
281 goto out_trans_end;
282 inode->i_ctime = current_time(inode);
283 gfs2_trans_add_meta(ip->i_gl, bh);
284 ip->i_diskflags = new_flags;
285 gfs2_dinode_out(ip, bh->b_data);
286 brelse(bh);
287 gfs2_set_inode_flags(inode);
288 gfs2_set_aops(inode);
289out_trans_end:
290 gfs2_trans_end(sdp);
291out:
292 gfs2_glock_dq_uninit(&gh);
293out_drop_write:
294 mnt_drop_write_file(filp);
295 return error;
296}
297
298static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
299{
300 struct inode *inode = file_inode(filp);
301 u32 fsflags, gfsflags = 0;
302 u32 mask;
303 int i;
304
305 if (get_user(fsflags, ptr))
306 return -EFAULT;
307
308 for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) {
309 if (fsflags & fsflag_gfs2flag[i].fsflag) {
310 fsflags &= ~fsflag_gfs2flag[i].fsflag;
311 gfsflags |= fsflag_gfs2flag[i].gfsflag;
312 }
313 }
314 if (fsflags || gfsflags & ~GFS2_FLAGS_USER_SET)
315 return -EINVAL;
316
317 mask = GFS2_FLAGS_USER_SET;
318 if (S_ISDIR(inode->i_mode)) {
319 mask &= ~GFS2_DIF_JDATA;
320 } else {
321 /* The GFS2_DIF_TOPDIR flag is only valid for directories. */
322 if (gfsflags & GFS2_DIF_TOPDIR)
323 return -EINVAL;
324 mask &= ~(GFS2_DIF_TOPDIR | GFS2_DIF_INHERIT_JDATA);
325 }
326
327 return do_gfs2_set_flags(filp, gfsflags, mask, fsflags);
328}
329
330static int gfs2_getlabel(struct file *filp, char __user *label)
331{
332 struct inode *inode = file_inode(filp);
333 struct gfs2_sbd *sdp = GFS2_SB(inode);
334
335 if (copy_to_user(label, sdp->sd_sb.sb_locktable, GFS2_LOCKNAME_LEN))
336 return -EFAULT;
337
338 return 0;
339}
340
341static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
342{
343 switch(cmd) {
344 case FS_IOC_GETFLAGS:
345 return gfs2_get_flags(filp, (u32 __user *)arg);
346 case FS_IOC_SETFLAGS:
347 return gfs2_set_flags(filp, (u32 __user *)arg);
348 case FITRIM:
349 return gfs2_fitrim(filp, (void __user *)arg);
350 case FS_IOC_GETFSLABEL:
351 return gfs2_getlabel(filp, (char __user *)arg);
352 }
353
354 return -ENOTTY;
355}
356
357/**
358 * gfs2_size_hint - Give a hint to the size of a write request
359 * @filep: The struct file
360 * @offset: The file offset of the write
361 * @size: The length of the write
362 *
363 * When we are about to do a write, this function records the total
364 * write size in order to provide a suitable hint to the lower layers
365 * about how many blocks will be required.
366 *
367 */
368
369static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size)
370{
371 struct inode *inode = file_inode(filep);
372 struct gfs2_sbd *sdp = GFS2_SB(inode);
373 struct gfs2_inode *ip = GFS2_I(inode);
374 size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift;
375 int hint = min_t(size_t, INT_MAX, blks);
376
377 if (hint > atomic_read(&ip->i_sizehint))
378 atomic_set(&ip->i_sizehint, hint);
379}
380
381/**
382 * gfs2_allocate_page_backing - Allocate blocks for a write fault
383 * @page: The (locked) page to allocate backing for
384 *
385 * We try to allocate all the blocks required for the page in one go. This
386 * might fail for various reasons, so we keep trying until all the blocks to
387 * back this page are allocated. If some of the blocks are already allocated,
388 * that is ok too.
389 */
390static int gfs2_allocate_page_backing(struct page *page)
391{
392 u64 pos = page_offset(page);
393 u64 size = PAGE_SIZE;
394
395 do {
396 struct iomap iomap = { };
397
398 if (gfs2_iomap_get_alloc(page->mapping->host, pos, 1, &iomap))
399 return -EIO;
400
401 iomap.length = min(iomap.length, size);
402 size -= iomap.length;
403 pos += iomap.length;
404 } while (size > 0);
405
406 return 0;
407}
408
409/**
410 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
411 * @vma: The virtual memory area
412 * @vmf: The virtual memory fault containing the page to become writable
413 *
414 * When the page becomes writable, we need to ensure that we have
415 * blocks allocated on disk to back that page.
416 */
417
418static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
419{
420 struct page *page = vmf->page;
421 struct inode *inode = file_inode(vmf->vma->vm_file);
422 struct gfs2_inode *ip = GFS2_I(inode);
423 struct gfs2_sbd *sdp = GFS2_SB(inode);
424 struct gfs2_alloc_parms ap = { .aflags = 0, };
425 unsigned long last_index;
426 u64 pos = page_offset(page);
427 unsigned int data_blocks, ind_blocks, rblocks;
428 struct gfs2_holder gh;
429 loff_t size;
430 int ret;
431
432 sb_start_pagefault(inode->i_sb);
433
434 ret = gfs2_rsqa_alloc(ip);
435 if (ret)
436 goto out;
437
438 gfs2_size_hint(vmf->vma->vm_file, pos, PAGE_SIZE);
439
440 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
441 ret = gfs2_glock_nq(&gh);
442 if (ret)
443 goto out_uninit;
444
445 /* Update file times before taking page lock */
446 file_update_time(vmf->vma->vm_file);
447
448 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
449 set_bit(GIF_SW_PAGED, &ip->i_flags);
450
451 if (!gfs2_write_alloc_required(ip, pos, PAGE_SIZE)) {
452 lock_page(page);
453 if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
454 ret = -EAGAIN;
455 unlock_page(page);
456 }
457 goto out_unlock;
458 }
459
460 ret = gfs2_rindex_update(sdp);
461 if (ret)
462 goto out_unlock;
463
464 gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
465 ap.target = data_blocks + ind_blocks;
466 ret = gfs2_quota_lock_check(ip, &ap);
467 if (ret)
468 goto out_unlock;
469 ret = gfs2_inplace_reserve(ip, &ap);
470 if (ret)
471 goto out_quota_unlock;
472
473 rblocks = RES_DINODE + ind_blocks;
474 if (gfs2_is_jdata(ip))
475 rblocks += data_blocks ? data_blocks : 1;
476 if (ind_blocks || data_blocks) {
477 rblocks += RES_STATFS + RES_QUOTA;
478 rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
479 }
480 ret = gfs2_trans_begin(sdp, rblocks, 0);
481 if (ret)
482 goto out_trans_fail;
483
484 lock_page(page);
485 ret = -EINVAL;
486 size = i_size_read(inode);
487 last_index = (size - 1) >> PAGE_SHIFT;
488 /* Check page index against inode size */
489 if (size == 0 || (page->index > last_index))
490 goto out_trans_end;
491
492 ret = -EAGAIN;
493 /* If truncated, we must retry the operation, we may have raced
494 * with the glock demotion code.
495 */
496 if (!PageUptodate(page) || page->mapping != inode->i_mapping)
497 goto out_trans_end;
498
499 /* Unstuff, if required, and allocate backing blocks for page */
500 ret = 0;
501 if (gfs2_is_stuffed(ip))
502 ret = gfs2_unstuff_dinode(ip, page);
503 if (ret == 0)
504 ret = gfs2_allocate_page_backing(page);
505
506out_trans_end:
507 if (ret)
508 unlock_page(page);
509 gfs2_trans_end(sdp);
510out_trans_fail:
511 gfs2_inplace_release(ip);
512out_quota_unlock:
513 gfs2_quota_unlock(ip);
514out_unlock:
515 gfs2_glock_dq(&gh);
516out_uninit:
517 gfs2_holder_uninit(&gh);
518 if (ret == 0) {
519 set_page_dirty(page);
520 wait_for_stable_page(page);
521 }
522out:
523 sb_end_pagefault(inode->i_sb);
524 return block_page_mkwrite_return(ret);
525}
526
527static const struct vm_operations_struct gfs2_vm_ops = {
528 .fault = filemap_fault,
529 .map_pages = filemap_map_pages,
530 .page_mkwrite = gfs2_page_mkwrite,
531};
532
533/**
534 * gfs2_mmap -
535 * @file: The file to map
536 * @vma: The VMA which described the mapping
537 *
538 * There is no need to get a lock here unless we should be updating
539 * atime. We ignore any locking errors since the only consequence is
540 * a missed atime update (which will just be deferred until later).
541 *
542 * Returns: 0
543 */
544
545static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
546{
547 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
548
549 if (!(file->f_flags & O_NOATIME) &&
550 !IS_NOATIME(&ip->i_inode)) {
551 struct gfs2_holder i_gh;
552 int error;
553
554 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
555 &i_gh);
556 if (error)
557 return error;
558 /* grab lock to update inode */
559 gfs2_glock_dq_uninit(&i_gh);
560 file_accessed(file);
561 }
562 vma->vm_ops = &gfs2_vm_ops;
563
564 return 0;
565}
566
567/**
568 * gfs2_open_common - This is common to open and atomic_open
569 * @inode: The inode being opened
570 * @file: The file being opened
571 *
572 * This maybe called under a glock or not depending upon how it has
573 * been called. We must always be called under a glock for regular
574 * files, however. For other file types, it does not matter whether
575 * we hold the glock or not.
576 *
577 * Returns: Error code or 0 for success
578 */
579
580int gfs2_open_common(struct inode *inode, struct file *file)
581{
582 struct gfs2_file *fp;
583 int ret;
584
585 if (S_ISREG(inode->i_mode)) {
586 ret = generic_file_open(inode, file);
587 if (ret)
588 return ret;
589 }
590
591 fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS);
592 if (!fp)
593 return -ENOMEM;
594
595 mutex_init(&fp->f_fl_mutex);
596
597 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
598 file->private_data = fp;
599 return 0;
600}
601
602/**
603 * gfs2_open - open a file
604 * @inode: the inode to open
605 * @file: the struct file for this opening
606 *
607 * After atomic_open, this function is only used for opening files
608 * which are already cached. We must still get the glock for regular
609 * files to ensure that we have the file size uptodate for the large
610 * file check which is in the common code. That is only an issue for
611 * regular files though.
612 *
613 * Returns: errno
614 */
615
616static int gfs2_open(struct inode *inode, struct file *file)
617{
618 struct gfs2_inode *ip = GFS2_I(inode);
619 struct gfs2_holder i_gh;
620 int error;
621 bool need_unlock = false;
622
623 if (S_ISREG(ip->i_inode.i_mode)) {
624 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
625 &i_gh);
626 if (error)
627 return error;
628 need_unlock = true;
629 }
630
631 error = gfs2_open_common(inode, file);
632
633 if (need_unlock)
634 gfs2_glock_dq_uninit(&i_gh);
635
636 return error;
637}
638
639/**
640 * gfs2_release - called to close a struct file
641 * @inode: the inode the struct file belongs to
642 * @file: the struct file being closed
643 *
644 * Returns: errno
645 */
646
647static int gfs2_release(struct inode *inode, struct file *file)
648{
649 struct gfs2_inode *ip = GFS2_I(inode);
650
651 kfree(file->private_data);
652 file->private_data = NULL;
653
654 if (!(file->f_mode & FMODE_WRITE))
655 return 0;
656
657 gfs2_rsqa_delete(ip, &inode->i_writecount);
658 return 0;
659}
660
661/**
662 * gfs2_fsync - sync the dirty data for a file (across the cluster)
663 * @file: the file that points to the dentry
664 * @start: the start position in the file to sync
665 * @end: the end position in the file to sync
666 * @datasync: set if we can ignore timestamp changes
667 *
668 * We split the data flushing here so that we don't wait for the data
669 * until after we've also sent the metadata to disk. Note that for
670 * data=ordered, we will write & wait for the data at the log flush
671 * stage anyway, so this is unlikely to make much of a difference
672 * except in the data=writeback case.
673 *
674 * If the fdatawrite fails due to any reason except -EIO, we will
675 * continue the remainder of the fsync, although we'll still report
676 * the error at the end. This is to match filemap_write_and_wait_range()
677 * behaviour.
678 *
679 * Returns: errno
680 */
681
682static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
683 int datasync)
684{
685 struct address_space *mapping = file->f_mapping;
686 struct inode *inode = mapping->host;
687 int sync_state = inode->i_state & I_DIRTY_ALL;
688 struct gfs2_inode *ip = GFS2_I(inode);
689 int ret = 0, ret1 = 0;
690
691 if (mapping->nrpages) {
692 ret1 = filemap_fdatawrite_range(mapping, start, end);
693 if (ret1 == -EIO)
694 return ret1;
695 }
696
697 if (!gfs2_is_jdata(ip))
698 sync_state &= ~I_DIRTY_PAGES;
699 if (datasync)
700 sync_state &= ~(I_DIRTY_SYNC | I_DIRTY_TIME);
701
702 if (sync_state) {
703 ret = sync_inode_metadata(inode, 1);
704 if (ret)
705 return ret;
706 if (gfs2_is_jdata(ip))
707 ret = file_write_and_wait(file);
708 if (ret)
709 return ret;
710 gfs2_ail_flush(ip->i_gl, 1);
711 }
712
713 if (mapping->nrpages)
714 ret = file_fdatawait_range(file, start, end);
715
716 return ret ? ret : ret1;
717}
718
719static ssize_t gfs2_file_direct_read(struct kiocb *iocb, struct iov_iter *to)
720{
721 struct file *file = iocb->ki_filp;
722 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
723 size_t count = iov_iter_count(to);
724 struct gfs2_holder gh;
725 ssize_t ret;
726
727 if (!count)
728 return 0; /* skip atime */
729
730 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
731 ret = gfs2_glock_nq(&gh);
732 if (ret)
733 goto out_uninit;
734
735 ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL);
736
737 gfs2_glock_dq(&gh);
738out_uninit:
739 gfs2_holder_uninit(&gh);
740 return ret;
741}
742
743static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
744{
745 struct file *file = iocb->ki_filp;
746 struct inode *inode = file->f_mapping->host;
747 struct gfs2_inode *ip = GFS2_I(inode);
748 size_t len = iov_iter_count(from);
749 loff_t offset = iocb->ki_pos;
750 struct gfs2_holder gh;
751 ssize_t ret;
752
753 /*
754 * Deferred lock, even if its a write, since we do no allocation on
755 * this path. All we need to change is the atime, and this lock mode
756 * ensures that other nodes have flushed their buffered read caches
757 * (i.e. their page cache entries for this inode). We do not,
758 * unfortunately, have the option of only flushing a range like the
759 * VFS does.
760 */
761 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
762 ret = gfs2_glock_nq(&gh);
763 if (ret)
764 goto out_uninit;
765
766 /* Silently fall back to buffered I/O when writing beyond EOF */
767 if (offset + len > i_size_read(&ip->i_inode))
768 goto out;
769
770 ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL);
771
772out:
773 gfs2_glock_dq(&gh);
774out_uninit:
775 gfs2_holder_uninit(&gh);
776 return ret;
777}
778
779static ssize_t gfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
780{
781 ssize_t ret;
782
783 if (iocb->ki_flags & IOCB_DIRECT) {
784 ret = gfs2_file_direct_read(iocb, to);
785 if (likely(ret != -ENOTBLK))
786 return ret;
787 iocb->ki_flags &= ~IOCB_DIRECT;
788 }
789 return generic_file_read_iter(iocb, to);
790}
791
792/**
793 * gfs2_file_write_iter - Perform a write to a file
794 * @iocb: The io context
795 * @from: The data to write
796 *
797 * We have to do a lock/unlock here to refresh the inode size for
798 * O_APPEND writes, otherwise we can land up writing at the wrong
799 * offset. There is still a race, but provided the app is using its
800 * own file locking, this will make O_APPEND work as expected.
801 *
802 */
803
804static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
805{
806 struct file *file = iocb->ki_filp;
807 struct inode *inode = file_inode(file);
808 struct gfs2_inode *ip = GFS2_I(inode);
809 ssize_t written = 0, ret;
810
811 ret = gfs2_rsqa_alloc(ip);
812 if (ret)
813 return ret;
814
815 gfs2_size_hint(file, iocb->ki_pos, iov_iter_count(from));
816
817 if (iocb->ki_flags & IOCB_APPEND) {
818 struct gfs2_holder gh;
819
820 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
821 if (ret)
822 return ret;
823 gfs2_glock_dq_uninit(&gh);
824 }
825
826 inode_lock(inode);
827 ret = generic_write_checks(iocb, from);
828 if (ret <= 0)
829 goto out;
830
831 /* We can write back this queue in page reclaim */
832 current->backing_dev_info = inode_to_bdi(inode);
833
834 ret = file_remove_privs(file);
835 if (ret)
836 goto out2;
837
838 ret = file_update_time(file);
839 if (ret)
840 goto out2;
841
842 if (iocb->ki_flags & IOCB_DIRECT) {
843 struct address_space *mapping = file->f_mapping;
844 loff_t pos, endbyte;
845 ssize_t buffered;
846
847 written = gfs2_file_direct_write(iocb, from);
848 if (written < 0 || !iov_iter_count(from))
849 goto out2;
850
851 ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
852 if (unlikely(ret < 0))
853 goto out2;
854 buffered = ret;
855
856 /*
857 * We need to ensure that the page cache pages are written to
858 * disk and invalidated to preserve the expected O_DIRECT
859 * semantics.
860 */
861 pos = iocb->ki_pos;
862 endbyte = pos + buffered - 1;
863 ret = filemap_write_and_wait_range(mapping, pos, endbyte);
864 if (!ret) {
865 iocb->ki_pos += buffered;
866 written += buffered;
867 invalidate_mapping_pages(mapping,
868 pos >> PAGE_SHIFT,
869 endbyte >> PAGE_SHIFT);
870 } else {
871 /*
872 * We don't know how much we wrote, so just return
873 * the number of bytes which were direct-written
874 */
875 }
876 } else {
877 ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
878 if (likely(ret > 0))
879 iocb->ki_pos += ret;
880 }
881
882out2:
883 current->backing_dev_info = NULL;
884out:
885 inode_unlock(inode);
886 if (likely(ret > 0)) {
887 /* Handle various SYNC-type writes */
888 ret = generic_write_sync(iocb, ret);
889 }
890 return written ? written : ret;
891}
892
893static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
894 int mode)
895{
896 struct super_block *sb = inode->i_sb;
897 struct gfs2_inode *ip = GFS2_I(inode);
898 loff_t end = offset + len;
899 struct buffer_head *dibh;
900 int error;
901
902 error = gfs2_meta_inode_buffer(ip, &dibh);
903 if (unlikely(error))
904 return error;
905
906 gfs2_trans_add_meta(ip->i_gl, dibh);
907
908 if (gfs2_is_stuffed(ip)) {
909 error = gfs2_unstuff_dinode(ip, NULL);
910 if (unlikely(error))
911 goto out;
912 }
913
914 while (offset < end) {
915 struct iomap iomap = { };
916
917 error = gfs2_iomap_get_alloc(inode, offset, end - offset,
918 &iomap);
919 if (error)
920 goto out;
921 offset = iomap.offset + iomap.length;
922 if (!(iomap.flags & IOMAP_F_NEW))
923 continue;
924 error = sb_issue_zeroout(sb, iomap.addr >> inode->i_blkbits,
925 iomap.length >> inode->i_blkbits,
926 GFP_NOFS);
927 if (error) {
928 fs_err(GFS2_SB(inode), "Failed to zero data buffers\n");
929 goto out;
930 }
931 }
932out:
933 brelse(dibh);
934 return error;
935}
936/**
937 * calc_max_reserv() - Reverse of write_calc_reserv. Given a number of
938 * blocks, determine how many bytes can be written.
939 * @ip: The inode in question.
940 * @len: Max cap of bytes. What we return in *len must be <= this.
941 * @data_blocks: Compute and return the number of data blocks needed
942 * @ind_blocks: Compute and return the number of indirect blocks needed
943 * @max_blocks: The total blocks available to work with.
944 *
945 * Returns: void, but @len, @data_blocks and @ind_blocks are filled in.
946 */
947static void calc_max_reserv(struct gfs2_inode *ip, loff_t *len,
948 unsigned int *data_blocks, unsigned int *ind_blocks,
949 unsigned int max_blocks)
950{
951 loff_t max = *len;
952 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
953 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
954
955 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
956 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
957 max_data -= tmp;
958 }
959
960 *data_blocks = max_data;
961 *ind_blocks = max_blocks - max_data;
962 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
963 if (*len > max) {
964 *len = max;
965 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
966 }
967}
968
969static long __gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
970{
971 struct inode *inode = file_inode(file);
972 struct gfs2_sbd *sdp = GFS2_SB(inode);
973 struct gfs2_inode *ip = GFS2_I(inode);
974 struct gfs2_alloc_parms ap = { .aflags = 0, };
975 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
976 loff_t bytes, max_bytes, max_blks;
977 int error;
978 const loff_t pos = offset;
979 const loff_t count = len;
980 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
981 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
982 loff_t max_chunk_size = UINT_MAX & bsize_mask;
983
984 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
985
986 offset &= bsize_mask;
987
988 len = next - offset;
989 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
990 if (!bytes)
991 bytes = UINT_MAX;
992 bytes &= bsize_mask;
993 if (bytes == 0)
994 bytes = sdp->sd_sb.sb_bsize;
995
996 gfs2_size_hint(file, offset, len);
997
998 gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
999 ap.min_target = data_blocks + ind_blocks;
1000
1001 while (len > 0) {
1002 if (len < bytes)
1003 bytes = len;
1004 if (!gfs2_write_alloc_required(ip, offset, bytes)) {
1005 len -= bytes;
1006 offset += bytes;
1007 continue;
1008 }
1009
1010 /* We need to determine how many bytes we can actually
1011 * fallocate without exceeding quota or going over the
1012 * end of the fs. We start off optimistically by assuming
1013 * we can write max_bytes */
1014 max_bytes = (len > max_chunk_size) ? max_chunk_size : len;
1015
1016 /* Since max_bytes is most likely a theoretical max, we
1017 * calculate a more realistic 'bytes' to serve as a good
1018 * starting point for the number of bytes we may be able
1019 * to write */
1020 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
1021 ap.target = data_blocks + ind_blocks;
1022
1023 error = gfs2_quota_lock_check(ip, &ap);
1024 if (error)
1025 return error;
1026 /* ap.allowed tells us how many blocks quota will allow
1027 * us to write. Check if this reduces max_blks */
1028 max_blks = UINT_MAX;
1029 if (ap.allowed)
1030 max_blks = ap.allowed;
1031
1032 error = gfs2_inplace_reserve(ip, &ap);
1033 if (error)
1034 goto out_qunlock;
1035
1036 /* check if the selected rgrp limits our max_blks further */
1037 if (ap.allowed && ap.allowed < max_blks)
1038 max_blks = ap.allowed;
1039
1040 /* Almost done. Calculate bytes that can be written using
1041 * max_blks. We also recompute max_bytes, data_blocks and
1042 * ind_blocks */
1043 calc_max_reserv(ip, &max_bytes, &data_blocks,
1044 &ind_blocks, max_blks);
1045
1046 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
1047 RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks);
1048 if (gfs2_is_jdata(ip))
1049 rblocks += data_blocks ? data_blocks : 1;
1050
1051 error = gfs2_trans_begin(sdp, rblocks,
1052 PAGE_SIZE >> inode->i_blkbits);
1053 if (error)
1054 goto out_trans_fail;
1055
1056 error = fallocate_chunk(inode, offset, max_bytes, mode);
1057 gfs2_trans_end(sdp);
1058
1059 if (error)
1060 goto out_trans_fail;
1061
1062 len -= max_bytes;
1063 offset += max_bytes;
1064 gfs2_inplace_release(ip);
1065 gfs2_quota_unlock(ip);
1066 }
1067
1068 if (!(mode & FALLOC_FL_KEEP_SIZE) && (pos + count) > inode->i_size)
1069 i_size_write(inode, pos + count);
1070 file_update_time(file);
1071 mark_inode_dirty(inode);
1072
1073 if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host))
1074 return vfs_fsync_range(file, pos, pos + count - 1,
1075 (file->f_flags & __O_SYNC) ? 0 : 1);
1076 return 0;
1077
1078out_trans_fail:
1079 gfs2_inplace_release(ip);
1080out_qunlock:
1081 gfs2_quota_unlock(ip);
1082 return error;
1083}
1084
1085static long gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
1086{
1087 struct inode *inode = file_inode(file);
1088 struct gfs2_sbd *sdp = GFS2_SB(inode);
1089 struct gfs2_inode *ip = GFS2_I(inode);
1090 struct gfs2_holder gh;
1091 int ret;
1092
1093 if (mode & ~(FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE))
1094 return -EOPNOTSUPP;
1095 /* fallocate is needed by gfs2_grow to reserve space in the rindex */
1096 if (gfs2_is_jdata(ip) && inode != sdp->sd_rindex)
1097 return -EOPNOTSUPP;
1098
1099 inode_lock(inode);
1100
1101 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1102 ret = gfs2_glock_nq(&gh);
1103 if (ret)
1104 goto out_uninit;
1105
1106 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
1107 (offset + len) > inode->i_size) {
1108 ret = inode_newsize_ok(inode, offset + len);
1109 if (ret)
1110 goto out_unlock;
1111 }
1112
1113 ret = get_write_access(inode);
1114 if (ret)
1115 goto out_unlock;
1116
1117 if (mode & FALLOC_FL_PUNCH_HOLE) {
1118 ret = __gfs2_punch_hole(file, offset, len);
1119 } else {
1120 ret = gfs2_rsqa_alloc(ip);
1121 if (ret)
1122 goto out_putw;
1123
1124 ret = __gfs2_fallocate(file, mode, offset, len);
1125
1126 if (ret)
1127 gfs2_rs_deltree(&ip->i_res);
1128 }
1129
1130out_putw:
1131 put_write_access(inode);
1132out_unlock:
1133 gfs2_glock_dq(&gh);
1134out_uninit:
1135 gfs2_holder_uninit(&gh);
1136 inode_unlock(inode);
1137 return ret;
1138}
1139
1140static ssize_t gfs2_file_splice_write(struct pipe_inode_info *pipe,
1141 struct file *out, loff_t *ppos,
1142 size_t len, unsigned int flags)
1143{
1144 int error;
1145 struct gfs2_inode *ip = GFS2_I(out->f_mapping->host);
1146
1147 error = gfs2_rsqa_alloc(ip);
1148 if (error)
1149 return (ssize_t)error;
1150
1151 gfs2_size_hint(out, *ppos, len);
1152
1153 return iter_file_splice_write(pipe, out, ppos, len, flags);
1154}
1155
1156#ifdef CONFIG_GFS2_FS_LOCKING_DLM
1157
1158/**
1159 * gfs2_lock - acquire/release a posix lock on a file
1160 * @file: the file pointer
1161 * @cmd: either modify or retrieve lock state, possibly wait
1162 * @fl: type and range of lock
1163 *
1164 * Returns: errno
1165 */
1166
1167static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
1168{
1169 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
1170 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
1171 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1172
1173 if (!(fl->fl_flags & FL_POSIX))
1174 return -ENOLCK;
1175 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
1176 return -ENOLCK;
1177
1178 if (cmd == F_CANCELLK) {
1179 /* Hack: */
1180 cmd = F_SETLK;
1181 fl->fl_type = F_UNLCK;
1182 }
1183 if (unlikely(test_bit(SDF_WITHDRAWN, &sdp->sd_flags))) {
1184 if (fl->fl_type == F_UNLCK)
1185 locks_lock_file_wait(file, fl);
1186 return -EIO;
1187 }
1188 if (IS_GETLK(cmd))
1189 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
1190 else if (fl->fl_type == F_UNLCK)
1191 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
1192 else
1193 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
1194}
1195
1196static int do_flock(struct file *file, int cmd, struct file_lock *fl)
1197{
1198 struct gfs2_file *fp = file->private_data;
1199 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1200 struct gfs2_inode *ip = GFS2_I(file_inode(file));
1201 struct gfs2_glock *gl;
1202 unsigned int state;
1203 u16 flags;
1204 int error = 0;
1205 int sleeptime;
1206
1207 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
1208 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY_1CB) | GL_EXACT;
1209
1210 mutex_lock(&fp->f_fl_mutex);
1211
1212 if (gfs2_holder_initialized(fl_gh)) {
1213 struct file_lock request;
1214 if (fl_gh->gh_state == state)
1215 goto out;
1216 locks_init_lock(&request);
1217 request.fl_type = F_UNLCK;
1218 request.fl_flags = FL_FLOCK;
1219 locks_lock_file_wait(file, &request);
1220 gfs2_glock_dq(fl_gh);
1221 gfs2_holder_reinit(state, flags, fl_gh);
1222 } else {
1223 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
1224 &gfs2_flock_glops, CREATE, &gl);
1225 if (error)
1226 goto out;
1227 gfs2_holder_init(gl, state, flags, fl_gh);
1228 gfs2_glock_put(gl);
1229 }
1230 for (sleeptime = 1; sleeptime <= 4; sleeptime <<= 1) {
1231 error = gfs2_glock_nq(fl_gh);
1232 if (error != GLR_TRYFAILED)
1233 break;
1234 fl_gh->gh_flags = LM_FLAG_TRY | GL_EXACT;
1235 fl_gh->gh_error = 0;
1236 msleep(sleeptime);
1237 }
1238 if (error) {
1239 gfs2_holder_uninit(fl_gh);
1240 if (error == GLR_TRYFAILED)
1241 error = -EAGAIN;
1242 } else {
1243 error = locks_lock_file_wait(file, fl);
1244 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1245 }
1246
1247out:
1248 mutex_unlock(&fp->f_fl_mutex);
1249 return error;
1250}
1251
1252static void do_unflock(struct file *file, struct file_lock *fl)
1253{
1254 struct gfs2_file *fp = file->private_data;
1255 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1256
1257 mutex_lock(&fp->f_fl_mutex);
1258 locks_lock_file_wait(file, fl);
1259 if (gfs2_holder_initialized(fl_gh)) {
1260 gfs2_glock_dq(fl_gh);
1261 gfs2_holder_uninit(fl_gh);
1262 }
1263 mutex_unlock(&fp->f_fl_mutex);
1264}
1265
1266/**
1267 * gfs2_flock - acquire/release a flock lock on a file
1268 * @file: the file pointer
1269 * @cmd: either modify or retrieve lock state, possibly wait
1270 * @fl: type and range of lock
1271 *
1272 * Returns: errno
1273 */
1274
1275static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
1276{
1277 if (!(fl->fl_flags & FL_FLOCK))
1278 return -ENOLCK;
1279 if (fl->fl_type & LOCK_MAND)
1280 return -EOPNOTSUPP;
1281
1282 if (fl->fl_type == F_UNLCK) {
1283 do_unflock(file, fl);
1284 return 0;
1285 } else {
1286 return do_flock(file, cmd, fl);
1287 }
1288}
1289
1290const struct file_operations gfs2_file_fops = {
1291 .llseek = gfs2_llseek,
1292 .read_iter = gfs2_file_read_iter,
1293 .write_iter = gfs2_file_write_iter,
1294 .iopoll = iomap_dio_iopoll,
1295 .unlocked_ioctl = gfs2_ioctl,
1296 .mmap = gfs2_mmap,
1297 .open = gfs2_open,
1298 .release = gfs2_release,
1299 .fsync = gfs2_fsync,
1300 .lock = gfs2_lock,
1301 .flock = gfs2_flock,
1302 .splice_read = generic_file_splice_read,
1303 .splice_write = gfs2_file_splice_write,
1304 .setlease = simple_nosetlease,
1305 .fallocate = gfs2_fallocate,
1306};
1307
1308const struct file_operations gfs2_dir_fops = {
1309 .iterate_shared = gfs2_readdir,
1310 .unlocked_ioctl = gfs2_ioctl,
1311 .open = gfs2_open,
1312 .release = gfs2_release,
1313 .fsync = gfs2_fsync,
1314 .lock = gfs2_lock,
1315 .flock = gfs2_flock,
1316 .llseek = default_llseek,
1317};
1318
1319#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
1320
1321const struct file_operations gfs2_file_fops_nolock = {
1322 .llseek = gfs2_llseek,
1323 .read_iter = gfs2_file_read_iter,
1324 .write_iter = gfs2_file_write_iter,
1325 .iopoll = iomap_dio_iopoll,
1326 .unlocked_ioctl = gfs2_ioctl,
1327 .mmap = gfs2_mmap,
1328 .open = gfs2_open,
1329 .release = gfs2_release,
1330 .fsync = gfs2_fsync,
1331 .splice_read = generic_file_splice_read,
1332 .splice_write = gfs2_file_splice_write,
1333 .setlease = generic_setlease,
1334 .fallocate = gfs2_fallocate,
1335};
1336
1337const struct file_operations gfs2_dir_fops_nolock = {
1338 .iterate_shared = gfs2_readdir,
1339 .unlocked_ioctl = gfs2_ioctl,
1340 .open = gfs2_open,
1341 .release = gfs2_release,
1342 .fsync = gfs2_fsync,
1343 .llseek = default_llseek,
1344};
1345