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9p: Push file_update_time() into v9fs_vm_page_mkwrite()
[linux-block.git] / fs / gfs2 / file.c
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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/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
29#include "gfs2.h"
30#include "incore.h"
31#include "bmap.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 * @origin: 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 origin)
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 (origin) {
62 case SEEK_END: /* These reference inode->i_size */
63 case SEEK_DATA:
64 case SEEK_HOLE:
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, origin);
69 gfs2_glock_dq_uninit(&i_gh);
70 }
71 break;
72 case SEEK_CUR:
73 case SEEK_SET:
74 error = generic_file_llseek(file, offset, origin);
75 break;
76 default:
77 error = -EINVAL;
78 }
79
80 return error;
81}
82
83/**
84 * gfs2_readdir - Read directory entries from a directory
85 * @file: The directory to read from
86 * @dirent: Buffer for dirents
87 * @filldir: Function used to do the copying
88 *
89 * Returns: errno
90 */
91
92static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir)
93{
94 struct inode *dir = file->f_mapping->host;
95 struct gfs2_inode *dip = GFS2_I(dir);
96 struct gfs2_holder d_gh;
97 u64 offset = file->f_pos;
98 int error;
99
100 gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
101 error = gfs2_glock_nq(&d_gh);
102 if (error) {
103 gfs2_holder_uninit(&d_gh);
104 return error;
105 }
106
107 error = gfs2_dir_read(dir, &offset, dirent, filldir, &file->f_ra);
108
109 gfs2_glock_dq_uninit(&d_gh);
110
111 file->f_pos = offset;
112
113 return error;
114}
115
116/**
117 * fsflags_cvt
118 * @table: A table of 32 u32 flags
119 * @val: a 32 bit value to convert
120 *
121 * This function can be used to convert between fsflags values and
122 * GFS2's own flags values.
123 *
124 * Returns: the converted flags
125 */
126static u32 fsflags_cvt(const u32 *table, u32 val)
127{
128 u32 res = 0;
129 while(val) {
130 if (val & 1)
131 res |= *table;
132 table++;
133 val >>= 1;
134 }
135 return res;
136}
137
138static const u32 fsflags_to_gfs2[32] = {
139 [3] = GFS2_DIF_SYNC,
140 [4] = GFS2_DIF_IMMUTABLE,
141 [5] = GFS2_DIF_APPENDONLY,
142 [7] = GFS2_DIF_NOATIME,
143 [12] = GFS2_DIF_EXHASH,
144 [14] = GFS2_DIF_INHERIT_JDATA,
145};
146
147static const u32 gfs2_to_fsflags[32] = {
148 [gfs2fl_Sync] = FS_SYNC_FL,
149 [gfs2fl_Immutable] = FS_IMMUTABLE_FL,
150 [gfs2fl_AppendOnly] = FS_APPEND_FL,
151 [gfs2fl_NoAtime] = FS_NOATIME_FL,
152 [gfs2fl_ExHash] = FS_INDEX_FL,
153 [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
154};
155
156static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
157{
158 struct inode *inode = filp->f_path.dentry->d_inode;
159 struct gfs2_inode *ip = GFS2_I(inode);
160 struct gfs2_holder gh;
161 int error;
162 u32 fsflags;
163
164 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
165 error = gfs2_glock_nq(&gh);
166 if (error)
167 return error;
168
169 fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags);
170 if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA)
171 fsflags |= FS_JOURNAL_DATA_FL;
172 if (put_user(fsflags, ptr))
173 error = -EFAULT;
174
175 gfs2_glock_dq(&gh);
176 gfs2_holder_uninit(&gh);
177 return error;
178}
179
180void gfs2_set_inode_flags(struct inode *inode)
181{
182 struct gfs2_inode *ip = GFS2_I(inode);
183 unsigned int flags = inode->i_flags;
184
185 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC);
186 if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode))
187 inode->i_flags |= S_NOSEC;
188 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
189 flags |= S_IMMUTABLE;
190 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
191 flags |= S_APPEND;
192 if (ip->i_diskflags & GFS2_DIF_NOATIME)
193 flags |= S_NOATIME;
194 if (ip->i_diskflags & GFS2_DIF_SYNC)
195 flags |= S_SYNC;
196 inode->i_flags = flags;
197}
198
199/* Flags that can be set by user space */
200#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
201 GFS2_DIF_IMMUTABLE| \
202 GFS2_DIF_APPENDONLY| \
203 GFS2_DIF_NOATIME| \
204 GFS2_DIF_SYNC| \
205 GFS2_DIF_SYSTEM| \
206 GFS2_DIF_INHERIT_JDATA)
207
208/**
209 * gfs2_set_flags - set flags on an inode
210 * @inode: The inode
211 * @flags: The flags to set
212 * @mask: Indicates which flags are valid
213 *
214 */
215static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
216{
217 struct inode *inode = filp->f_path.dentry->d_inode;
218 struct gfs2_inode *ip = GFS2_I(inode);
219 struct gfs2_sbd *sdp = GFS2_SB(inode);
220 struct buffer_head *bh;
221 struct gfs2_holder gh;
222 int error;
223 u32 new_flags, flags;
224
225 error = mnt_want_write_file(filp);
226 if (error)
227 return error;
228
229 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
230 if (error)
231 goto out_drop_write;
232
233 error = -EACCES;
234 if (!inode_owner_or_capable(inode))
235 goto out;
236
237 error = 0;
238 flags = ip->i_diskflags;
239 new_flags = (flags & ~mask) | (reqflags & mask);
240 if ((new_flags ^ flags) == 0)
241 goto out;
242
243 error = -EINVAL;
244 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
245 goto out;
246
247 error = -EPERM;
248 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
249 goto out;
250 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
251 goto out;
252 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
253 !capable(CAP_LINUX_IMMUTABLE))
254 goto out;
255 if (!IS_IMMUTABLE(inode)) {
256 error = gfs2_permission(inode, MAY_WRITE);
257 if (error)
258 goto out;
259 }
260 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
261 if (flags & GFS2_DIF_JDATA)
262 gfs2_log_flush(sdp, ip->i_gl);
263 error = filemap_fdatawrite(inode->i_mapping);
264 if (error)
265 goto out;
266 error = filemap_fdatawait(inode->i_mapping);
267 if (error)
268 goto out;
269 }
270 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
271 if (error)
272 goto out;
273 error = gfs2_meta_inode_buffer(ip, &bh);
274 if (error)
275 goto out_trans_end;
276 gfs2_trans_add_bh(ip->i_gl, bh, 1);
277 ip->i_diskflags = new_flags;
278 gfs2_dinode_out(ip, bh->b_data);
279 brelse(bh);
280 gfs2_set_inode_flags(inode);
281 gfs2_set_aops(inode);
282out_trans_end:
283 gfs2_trans_end(sdp);
284out:
285 gfs2_glock_dq_uninit(&gh);
286out_drop_write:
287 mnt_drop_write_file(filp);
288 return error;
289}
290
291static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
292{
293 struct inode *inode = filp->f_path.dentry->d_inode;
294 u32 fsflags, gfsflags;
295
296 if (get_user(fsflags, ptr))
297 return -EFAULT;
298
299 gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
300 if (!S_ISDIR(inode->i_mode)) {
301 if (gfsflags & GFS2_DIF_INHERIT_JDATA)
302 gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);
303 return do_gfs2_set_flags(filp, gfsflags, ~0);
304 }
305 return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA);
306}
307
308static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
309{
310 switch(cmd) {
311 case FS_IOC_GETFLAGS:
312 return gfs2_get_flags(filp, (u32 __user *)arg);
313 case FS_IOC_SETFLAGS:
314 return gfs2_set_flags(filp, (u32 __user *)arg);
315 case FITRIM:
316 return gfs2_fitrim(filp, (void __user *)arg);
317 }
318 return -ENOTTY;
319}
320
321/**
322 * gfs2_allocate_page_backing - Use bmap to allocate blocks
323 * @page: The (locked) page to allocate backing for
324 *
325 * We try to allocate all the blocks required for the page in
326 * one go. This might fail for various reasons, so we keep
327 * trying until all the blocks to back this page are allocated.
328 * If some of the blocks are already allocated, thats ok too.
329 */
330
331static int gfs2_allocate_page_backing(struct page *page)
332{
333 struct inode *inode = page->mapping->host;
334 struct buffer_head bh;
335 unsigned long size = PAGE_CACHE_SIZE;
336 u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
337
338 do {
339 bh.b_state = 0;
340 bh.b_size = size;
341 gfs2_block_map(inode, lblock, &bh, 1);
342 if (!buffer_mapped(&bh))
343 return -EIO;
344 size -= bh.b_size;
345 lblock += (bh.b_size >> inode->i_blkbits);
346 } while(size > 0);
347 return 0;
348}
349
350/**
351 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
352 * @vma: The virtual memory area
353 * @page: The page which is about to become writable
354 *
355 * When the page becomes writable, we need to ensure that we have
356 * blocks allocated on disk to back that page.
357 */
358
359static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
360{
361 struct page *page = vmf->page;
362 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
363 struct gfs2_inode *ip = GFS2_I(inode);
364 struct gfs2_sbd *sdp = GFS2_SB(inode);
365 unsigned long last_index;
366 u64 pos = page->index << PAGE_CACHE_SHIFT;
367 unsigned int data_blocks, ind_blocks, rblocks;
368 struct gfs2_holder gh;
369 struct gfs2_qadata *qa;
370 loff_t size;
371 int ret;
372
373 /* Wait if fs is frozen. This is racy so we check again later on
374 * and retry if the fs has been frozen after the page lock has
375 * been acquired
376 */
377 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
378
379 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
380 ret = gfs2_glock_nq(&gh);
381 if (ret)
382 goto out;
383
384 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
385 set_bit(GIF_SW_PAGED, &ip->i_flags);
386
387 if (!gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE)) {
388 lock_page(page);
389 if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
390 ret = -EAGAIN;
391 unlock_page(page);
392 }
393 goto out_unlock;
394 }
395
396 ret = -ENOMEM;
397 qa = gfs2_qadata_get(ip);
398 if (qa == NULL)
399 goto out_unlock;
400
401 ret = gfs2_quota_lock_check(ip);
402 if (ret)
403 goto out_alloc_put;
404 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
405 ret = gfs2_inplace_reserve(ip, data_blocks + ind_blocks);
406 if (ret)
407 goto out_quota_unlock;
408
409 rblocks = RES_DINODE + ind_blocks;
410 if (gfs2_is_jdata(ip))
411 rblocks += data_blocks ? data_blocks : 1;
412 if (ind_blocks || data_blocks) {
413 rblocks += RES_STATFS + RES_QUOTA;
414 rblocks += gfs2_rg_blocks(ip);
415 }
416 ret = gfs2_trans_begin(sdp, rblocks, 0);
417 if (ret)
418 goto out_trans_fail;
419
420 lock_page(page);
421 ret = -EINVAL;
422 size = i_size_read(inode);
423 last_index = (size - 1) >> PAGE_CACHE_SHIFT;
424 /* Check page index against inode size */
425 if (size == 0 || (page->index > last_index))
426 goto out_trans_end;
427
428 ret = -EAGAIN;
429 /* If truncated, we must retry the operation, we may have raced
430 * with the glock demotion code.
431 */
432 if (!PageUptodate(page) || page->mapping != inode->i_mapping)
433 goto out_trans_end;
434
435 /* Unstuff, if required, and allocate backing blocks for page */
436 ret = 0;
437 if (gfs2_is_stuffed(ip))
438 ret = gfs2_unstuff_dinode(ip, page);
439 if (ret == 0)
440 ret = gfs2_allocate_page_backing(page);
441
442out_trans_end:
443 if (ret)
444 unlock_page(page);
445 gfs2_trans_end(sdp);
446out_trans_fail:
447 gfs2_inplace_release(ip);
448out_quota_unlock:
449 gfs2_quota_unlock(ip);
450out_alloc_put:
451 gfs2_qadata_put(ip);
452out_unlock:
453 gfs2_glock_dq(&gh);
454out:
455 gfs2_holder_uninit(&gh);
456 if (ret == 0) {
457 set_page_dirty(page);
458 /* This check must be post dropping of transaction lock */
459 if (inode->i_sb->s_frozen == SB_UNFROZEN) {
460 wait_on_page_writeback(page);
461 } else {
462 ret = -EAGAIN;
463 unlock_page(page);
464 }
465 }
466 return block_page_mkwrite_return(ret);
467}
468
469static const struct vm_operations_struct gfs2_vm_ops = {
470 .fault = filemap_fault,
471 .page_mkwrite = gfs2_page_mkwrite,
472};
473
474/**
475 * gfs2_mmap -
476 * @file: The file to map
477 * @vma: The VMA which described the mapping
478 *
479 * There is no need to get a lock here unless we should be updating
480 * atime. We ignore any locking errors since the only consequence is
481 * a missed atime update (which will just be deferred until later).
482 *
483 * Returns: 0
484 */
485
486static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
487{
488 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
489
490 if (!(file->f_flags & O_NOATIME) &&
491 !IS_NOATIME(&ip->i_inode)) {
492 struct gfs2_holder i_gh;
493 int error;
494
495 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
496 error = gfs2_glock_nq(&i_gh);
497 if (error == 0) {
498 file_accessed(file);
499 gfs2_glock_dq(&i_gh);
500 }
501 gfs2_holder_uninit(&i_gh);
502 if (error)
503 return error;
504 }
505 vma->vm_ops = &gfs2_vm_ops;
506 vma->vm_flags |= VM_CAN_NONLINEAR;
507
508 return 0;
509}
510
511/**
512 * gfs2_open - open a file
513 * @inode: the inode to open
514 * @file: the struct file for this opening
515 *
516 * Returns: errno
517 */
518
519static int gfs2_open(struct inode *inode, struct file *file)
520{
521 struct gfs2_inode *ip = GFS2_I(inode);
522 struct gfs2_holder i_gh;
523 struct gfs2_file *fp;
524 int error;
525
526 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
527 if (!fp)
528 return -ENOMEM;
529
530 mutex_init(&fp->f_fl_mutex);
531
532 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
533 file->private_data = fp;
534
535 if (S_ISREG(ip->i_inode.i_mode)) {
536 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
537 &i_gh);
538 if (error)
539 goto fail;
540
541 if (!(file->f_flags & O_LARGEFILE) &&
542 i_size_read(inode) > MAX_NON_LFS) {
543 error = -EOVERFLOW;
544 goto fail_gunlock;
545 }
546
547 gfs2_glock_dq_uninit(&i_gh);
548 }
549
550 return 0;
551
552fail_gunlock:
553 gfs2_glock_dq_uninit(&i_gh);
554fail:
555 file->private_data = NULL;
556 kfree(fp);
557 return error;
558}
559
560/**
561 * gfs2_release - called to close a struct file
562 * @inode: the inode the struct file belongs to
563 * @file: the struct file being closed
564 *
565 * Returns: errno
566 */
567
568static int gfs2_release(struct inode *inode, struct file *file)
569{
570 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
571 struct gfs2_file *fp;
572
573 fp = file->private_data;
574 file->private_data = NULL;
575
576 if (gfs2_assert_warn(sdp, fp))
577 return -EIO;
578
579 kfree(fp);
580
581 return 0;
582}
583
584/**
585 * gfs2_fsync - sync the dirty data for a file (across the cluster)
586 * @file: the file that points to the dentry
587 * @start: the start position in the file to sync
588 * @end: the end position in the file to sync
589 * @datasync: set if we can ignore timestamp changes
590 *
591 * We split the data flushing here so that we don't wait for the data
592 * until after we've also sent the metadata to disk. Note that for
593 * data=ordered, we will write & wait for the data at the log flush
594 * stage anyway, so this is unlikely to make much of a difference
595 * except in the data=writeback case.
596 *
597 * If the fdatawrite fails due to any reason except -EIO, we will
598 * continue the remainder of the fsync, although we'll still report
599 * the error at the end. This is to match filemap_write_and_wait_range()
600 * behaviour.
601 *
602 * Returns: errno
603 */
604
605static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
606 int datasync)
607{
608 struct address_space *mapping = file->f_mapping;
609 struct inode *inode = mapping->host;
610 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
611 struct gfs2_inode *ip = GFS2_I(inode);
612 int ret = 0, ret1 = 0;
613
614 if (mapping->nrpages) {
615 ret1 = filemap_fdatawrite_range(mapping, start, end);
616 if (ret1 == -EIO)
617 return ret1;
618 }
619
620 if (datasync)
621 sync_state &= ~I_DIRTY_SYNC;
622
623 if (sync_state) {
624 ret = sync_inode_metadata(inode, 1);
625 if (ret)
626 return ret;
627 if (gfs2_is_jdata(ip))
628 filemap_write_and_wait(mapping);
629 gfs2_ail_flush(ip->i_gl, 1);
630 }
631
632 if (mapping->nrpages)
633 ret = filemap_fdatawait_range(mapping, start, end);
634
635 return ret ? ret : ret1;
636}
637
638/**
639 * gfs2_file_aio_write - Perform a write to a file
640 * @iocb: The io context
641 * @iov: The data to write
642 * @nr_segs: Number of @iov segments
643 * @pos: The file position
644 *
645 * We have to do a lock/unlock here to refresh the inode size for
646 * O_APPEND writes, otherwise we can land up writing at the wrong
647 * offset. There is still a race, but provided the app is using its
648 * own file locking, this will make O_APPEND work as expected.
649 *
650 */
651
652static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
653 unsigned long nr_segs, loff_t pos)
654{
655 struct file *file = iocb->ki_filp;
656
657 if (file->f_flags & O_APPEND) {
658 struct dentry *dentry = file->f_dentry;
659 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
660 struct gfs2_holder gh;
661 int ret;
662
663 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
664 if (ret)
665 return ret;
666 gfs2_glock_dq_uninit(&gh);
667 }
668
669 return generic_file_aio_write(iocb, iov, nr_segs, pos);
670}
671
672static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
673 int mode)
674{
675 struct gfs2_inode *ip = GFS2_I(inode);
676 struct buffer_head *dibh;
677 int error;
678 loff_t size = len;
679 unsigned int nr_blks;
680 sector_t lblock = offset >> inode->i_blkbits;
681
682 error = gfs2_meta_inode_buffer(ip, &dibh);
683 if (unlikely(error))
684 return error;
685
686 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
687
688 if (gfs2_is_stuffed(ip)) {
689 error = gfs2_unstuff_dinode(ip, NULL);
690 if (unlikely(error))
691 goto out;
692 }
693
694 while (len) {
695 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
696 bh_map.b_size = len;
697 set_buffer_zeronew(&bh_map);
698
699 error = gfs2_block_map(inode, lblock, &bh_map, 1);
700 if (unlikely(error))
701 goto out;
702 len -= bh_map.b_size;
703 nr_blks = bh_map.b_size >> inode->i_blkbits;
704 lblock += nr_blks;
705 if (!buffer_new(&bh_map))
706 continue;
707 if (unlikely(!buffer_zeronew(&bh_map))) {
708 error = -EIO;
709 goto out;
710 }
711 }
712 if (offset + size > inode->i_size && !(mode & FALLOC_FL_KEEP_SIZE))
713 i_size_write(inode, offset + size);
714
715 mark_inode_dirty(inode);
716
717out:
718 brelse(dibh);
719 return error;
720}
721
722static void calc_max_reserv(struct gfs2_inode *ip, loff_t max, loff_t *len,
723 unsigned int *data_blocks, unsigned int *ind_blocks)
724{
725 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
726 unsigned int max_blocks = ip->i_rgd->rd_free_clone;
727 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
728
729 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
730 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
731 max_data -= tmp;
732 }
733 /* This calculation isn't the exact reverse of gfs2_write_calc_reserve,
734 so it might end up with fewer data blocks */
735 if (max_data <= *data_blocks)
736 return;
737 *data_blocks = max_data;
738 *ind_blocks = max_blocks - max_data;
739 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
740 if (*len > max) {
741 *len = max;
742 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
743 }
744}
745
746static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
747 loff_t len)
748{
749 struct inode *inode = file->f_path.dentry->d_inode;
750 struct gfs2_sbd *sdp = GFS2_SB(inode);
751 struct gfs2_inode *ip = GFS2_I(inode);
752 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
753 loff_t bytes, max_bytes;
754 struct gfs2_qadata *qa;
755 int error;
756 const loff_t pos = offset;
757 const loff_t count = len;
758 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
759 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
760 loff_t max_chunk_size = UINT_MAX & bsize_mask;
761 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
762
763 /* We only support the FALLOC_FL_KEEP_SIZE mode */
764 if (mode & ~FALLOC_FL_KEEP_SIZE)
765 return -EOPNOTSUPP;
766
767 offset &= bsize_mask;
768
769 len = next - offset;
770 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
771 if (!bytes)
772 bytes = UINT_MAX;
773 bytes &= bsize_mask;
774 if (bytes == 0)
775 bytes = sdp->sd_sb.sb_bsize;
776
777 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
778 error = gfs2_glock_nq(&ip->i_gh);
779 if (unlikely(error))
780 goto out_uninit;
781
782 while (len > 0) {
783 if (len < bytes)
784 bytes = len;
785 if (!gfs2_write_alloc_required(ip, offset, bytes)) {
786 len -= bytes;
787 offset += bytes;
788 continue;
789 }
790 qa = gfs2_qadata_get(ip);
791 if (!qa) {
792 error = -ENOMEM;
793 goto out_unlock;
794 }
795
796 error = gfs2_quota_lock_check(ip);
797 if (error)
798 goto out_alloc_put;
799
800retry:
801 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
802
803 error = gfs2_inplace_reserve(ip, data_blocks + ind_blocks);
804 if (error) {
805 if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) {
806 bytes >>= 1;
807 bytes &= bsize_mask;
808 if (bytes == 0)
809 bytes = sdp->sd_sb.sb_bsize;
810 goto retry;
811 }
812 goto out_qunlock;
813 }
814 max_bytes = bytes;
815 calc_max_reserv(ip, (len > max_chunk_size)? max_chunk_size: len,
816 &max_bytes, &data_blocks, &ind_blocks);
817
818 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
819 RES_RG_HDR + gfs2_rg_blocks(ip);
820 if (gfs2_is_jdata(ip))
821 rblocks += data_blocks ? data_blocks : 1;
822
823 error = gfs2_trans_begin(sdp, rblocks,
824 PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize);
825 if (error)
826 goto out_trans_fail;
827
828 error = fallocate_chunk(inode, offset, max_bytes, mode);
829 gfs2_trans_end(sdp);
830
831 if (error)
832 goto out_trans_fail;
833
834 len -= max_bytes;
835 offset += max_bytes;
836 gfs2_inplace_release(ip);
837 gfs2_quota_unlock(ip);
838 gfs2_qadata_put(ip);
839 }
840
841 if (error == 0)
842 error = generic_write_sync(file, pos, count);
843 goto out_unlock;
844
845out_trans_fail:
846 gfs2_inplace_release(ip);
847out_qunlock:
848 gfs2_quota_unlock(ip);
849out_alloc_put:
850 gfs2_qadata_put(ip);
851out_unlock:
852 gfs2_glock_dq(&ip->i_gh);
853out_uninit:
854 gfs2_holder_uninit(&ip->i_gh);
855 return error;
856}
857
858#ifdef CONFIG_GFS2_FS_LOCKING_DLM
859
860/**
861 * gfs2_setlease - acquire/release a file lease
862 * @file: the file pointer
863 * @arg: lease type
864 * @fl: file lock
865 *
866 * We don't currently have a way to enforce a lease across the whole
867 * cluster; until we do, disable leases (by just returning -EINVAL),
868 * unless the administrator has requested purely local locking.
869 *
870 * Locking: called under lock_flocks
871 *
872 * Returns: errno
873 */
874
875static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
876{
877 return -EINVAL;
878}
879
880/**
881 * gfs2_lock - acquire/release a posix lock on a file
882 * @file: the file pointer
883 * @cmd: either modify or retrieve lock state, possibly wait
884 * @fl: type and range of lock
885 *
886 * Returns: errno
887 */
888
889static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
890{
891 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
892 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
893 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
894
895 if (!(fl->fl_flags & FL_POSIX))
896 return -ENOLCK;
897 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
898 return -ENOLCK;
899
900 if (cmd == F_CANCELLK) {
901 /* Hack: */
902 cmd = F_SETLK;
903 fl->fl_type = F_UNLCK;
904 }
905 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
906 return -EIO;
907 if (IS_GETLK(cmd))
908 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
909 else if (fl->fl_type == F_UNLCK)
910 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
911 else
912 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
913}
914
915static int do_flock(struct file *file, int cmd, struct file_lock *fl)
916{
917 struct gfs2_file *fp = file->private_data;
918 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
919 struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
920 struct gfs2_glock *gl;
921 unsigned int state;
922 int flags;
923 int error = 0;
924
925 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
926 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
927
928 mutex_lock(&fp->f_fl_mutex);
929
930 gl = fl_gh->gh_gl;
931 if (gl) {
932 if (fl_gh->gh_state == state)
933 goto out;
934 flock_lock_file_wait(file,
935 &(struct file_lock){.fl_type = F_UNLCK});
936 gfs2_glock_dq_wait(fl_gh);
937 gfs2_holder_reinit(state, flags, fl_gh);
938 } else {
939 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
940 &gfs2_flock_glops, CREATE, &gl);
941 if (error)
942 goto out;
943 gfs2_holder_init(gl, state, flags, fl_gh);
944 gfs2_glock_put(gl);
945 }
946 error = gfs2_glock_nq(fl_gh);
947 if (error) {
948 gfs2_holder_uninit(fl_gh);
949 if (error == GLR_TRYFAILED)
950 error = -EAGAIN;
951 } else {
952 error = flock_lock_file_wait(file, fl);
953 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
954 }
955
956out:
957 mutex_unlock(&fp->f_fl_mutex);
958 return error;
959}
960
961static void do_unflock(struct file *file, struct file_lock *fl)
962{
963 struct gfs2_file *fp = file->private_data;
964 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
965
966 mutex_lock(&fp->f_fl_mutex);
967 flock_lock_file_wait(file, fl);
968 if (fl_gh->gh_gl) {
969 gfs2_glock_dq_wait(fl_gh);
970 gfs2_holder_uninit(fl_gh);
971 }
972 mutex_unlock(&fp->f_fl_mutex);
973}
974
975/**
976 * gfs2_flock - acquire/release a flock lock on a file
977 * @file: the file pointer
978 * @cmd: either modify or retrieve lock state, possibly wait
979 * @fl: type and range of lock
980 *
981 * Returns: errno
982 */
983
984static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
985{
986 if (!(fl->fl_flags & FL_FLOCK))
987 return -ENOLCK;
988 if (fl->fl_type & LOCK_MAND)
989 return -EOPNOTSUPP;
990
991 if (fl->fl_type == F_UNLCK) {
992 do_unflock(file, fl);
993 return 0;
994 } else {
995 return do_flock(file, cmd, fl);
996 }
997}
998
999const struct file_operations gfs2_file_fops = {
1000 .llseek = gfs2_llseek,
1001 .read = do_sync_read,
1002 .aio_read = generic_file_aio_read,
1003 .write = do_sync_write,
1004 .aio_write = gfs2_file_aio_write,
1005 .unlocked_ioctl = gfs2_ioctl,
1006 .mmap = gfs2_mmap,
1007 .open = gfs2_open,
1008 .release = gfs2_release,
1009 .fsync = gfs2_fsync,
1010 .lock = gfs2_lock,
1011 .flock = gfs2_flock,
1012 .splice_read = generic_file_splice_read,
1013 .splice_write = generic_file_splice_write,
1014 .setlease = gfs2_setlease,
1015 .fallocate = gfs2_fallocate,
1016};
1017
1018const struct file_operations gfs2_dir_fops = {
1019 .readdir = gfs2_readdir,
1020 .unlocked_ioctl = gfs2_ioctl,
1021 .open = gfs2_open,
1022 .release = gfs2_release,
1023 .fsync = gfs2_fsync,
1024 .lock = gfs2_lock,
1025 .flock = gfs2_flock,
1026 .llseek = default_llseek,
1027};
1028
1029#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
1030
1031const struct file_operations gfs2_file_fops_nolock = {
1032 .llseek = gfs2_llseek,
1033 .read = do_sync_read,
1034 .aio_read = generic_file_aio_read,
1035 .write = do_sync_write,
1036 .aio_write = gfs2_file_aio_write,
1037 .unlocked_ioctl = gfs2_ioctl,
1038 .mmap = gfs2_mmap,
1039 .open = gfs2_open,
1040 .release = gfs2_release,
1041 .fsync = gfs2_fsync,
1042 .splice_read = generic_file_splice_read,
1043 .splice_write = generic_file_splice_write,
1044 .setlease = generic_setlease,
1045 .fallocate = gfs2_fallocate,
1046};
1047
1048const struct file_operations gfs2_dir_fops_nolock = {
1049 .readdir = gfs2_readdir,
1050 .unlocked_ioctl = gfs2_ioctl,
1051 .open = gfs2_open,
1052 .release = gfs2_release,
1053 .fsync = gfs2_fsync,
1054 .llseek = default_llseek,
1055};
1056
Linux 6.x block layer and io_uring tree(s)