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authorSteven Whitehouse <swhiteho@redhat.com>2009-05-22 05:01:55 -0400
committerSteven Whitehouse <swhiteho@redhat.com>2009-05-22 05:01:55 -0400
commitb1e71b0622974953e46a284aa986504a90869a9b (patch)
tree0eb0f68c8b432b6332437e918ca2ab4e0c72d897 /fs/gfs2/ops_file.c
parent1ce97e564b628bee30b8dbb64e5e653a484308f6 (diff)
GFS2: Clean up some file names
This patch renames the ops_*.c files which have no counterpart without the ops_ prefix in order to shorten the name and make it more readable. In addition, ops_address.h (which was very small) is moved into inode.h and inode.h is cleaned up by adding extern where required. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/ops_file.c')
-rw-r--r--fs/gfs2/ops_file.c766
1 files changed, 0 insertions, 766 deletions
diff --git a/fs/gfs2/ops_file.c b/fs/gfs2/ops_file.c
deleted file mode 100644
index 0ee7bd287c5a..000000000000
--- a/fs/gfs2/ops_file.c
+++ /dev/null
@@ -1,766 +0,0 @@
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/crc32.h>
23#include <linux/writeback.h>
24#include <asm/uaccess.h>
25#include <linux/dlm.h>
26#include <linux/dlm_plock.h>
27
28#include "gfs2.h"
29#include "incore.h"
30#include "bmap.h"
31#include "dir.h"
32#include "glock.h"
33#include "glops.h"
34#include "inode.h"
35#include "log.h"
36#include "meta_io.h"
37#include "quota.h"
38#include "rgrp.h"
39#include "trans.h"
40#include "util.h"
41#include "eaops.h"
42#include "ops_address.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);
178 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
179 flags |= S_IMMUTABLE;
180 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
181 flags |= S_APPEND;
182 if (ip->i_diskflags & GFS2_DIF_NOATIME)
183 flags |= S_NOATIME;
184 if (ip->i_diskflags & GFS2_DIF_SYNC)
185 flags |= S_SYNC;
186 inode->i_flags = flags;
187}
188
189/* Flags that can be set by user space */
190#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
191 GFS2_DIF_IMMUTABLE| \
192 GFS2_DIF_APPENDONLY| \
193 GFS2_DIF_NOATIME| \
194 GFS2_DIF_SYNC| \
195 GFS2_DIF_SYSTEM| \
196 GFS2_DIF_INHERIT_JDATA)
197
198/**
199 * gfs2_set_flags - set flags on an inode
200 * @inode: The inode
201 * @flags: The flags to set
202 * @mask: Indicates which flags are valid
203 *
204 */
205static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
206{
207 struct inode *inode = filp->f_path.dentry->d_inode;
208 struct gfs2_inode *ip = GFS2_I(inode);
209 struct gfs2_sbd *sdp = GFS2_SB(inode);
210 struct buffer_head *bh;
211 struct gfs2_holder gh;
212 int error;
213 u32 new_flags, flags;
214
215 error = mnt_want_write(filp->f_path.mnt);
216 if (error)
217 return error;
218
219 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
220 if (error)
221 goto out_drop_write;
222
223 flags = ip->i_diskflags;
224 new_flags = (flags & ~mask) | (reqflags & mask);
225 if ((new_flags ^ flags) == 0)
226 goto out;
227
228 error = -EINVAL;
229 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
230 goto out;
231
232 error = -EPERM;
233 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
234 goto out;
235 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
236 goto out;
237 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
238 !capable(CAP_LINUX_IMMUTABLE))
239 goto out;
240 if (!IS_IMMUTABLE(inode)) {
241 error = gfs2_permission(inode, MAY_WRITE);
242 if (error)
243 goto out;
244 }
245 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
246 if (flags & GFS2_DIF_JDATA)
247 gfs2_log_flush(sdp, ip->i_gl);
248 error = filemap_fdatawrite(inode->i_mapping);
249 if (error)
250 goto out;
251 error = filemap_fdatawait(inode->i_mapping);
252 if (error)
253 goto out;
254 }
255 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
256 if (error)
257 goto out;
258 error = gfs2_meta_inode_buffer(ip, &bh);
259 if (error)
260 goto out_trans_end;
261 gfs2_trans_add_bh(ip->i_gl, bh, 1);
262 ip->i_diskflags = new_flags;
263 gfs2_dinode_out(ip, bh->b_data);
264 brelse(bh);
265 gfs2_set_inode_flags(inode);
266 gfs2_set_aops(inode);
267out_trans_end:
268 gfs2_trans_end(sdp);
269out:
270 gfs2_glock_dq_uninit(&gh);
271out_drop_write:
272 mnt_drop_write(filp->f_path.mnt);
273 return error;
274}
275
276static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
277{
278 struct inode *inode = filp->f_path.dentry->d_inode;
279 u32 fsflags, gfsflags;
280 if (get_user(fsflags, ptr))
281 return -EFAULT;
282 gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
283 if (!S_ISDIR(inode->i_mode)) {
284 if (gfsflags & GFS2_DIF_INHERIT_JDATA)
285 gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);
286 return do_gfs2_set_flags(filp, gfsflags, ~0);
287 }
288 return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA);
289}
290
291static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
292{
293 switch(cmd) {
294 case FS_IOC_GETFLAGS:
295 return gfs2_get_flags(filp, (u32 __user *)arg);
296 case FS_IOC_SETFLAGS:
297 return gfs2_set_flags(filp, (u32 __user *)arg);
298 }
299 return -ENOTTY;
300}
301
302/**
303 * gfs2_allocate_page_backing - Use bmap to allocate blocks
304 * @page: The (locked) page to allocate backing for
305 *
306 * We try to allocate all the blocks required for the page in
307 * one go. This might fail for various reasons, so we keep
308 * trying until all the blocks to back this page are allocated.
309 * If some of the blocks are already allocated, thats ok too.
310 */
311
312static int gfs2_allocate_page_backing(struct page *page)
313{
314 struct inode *inode = page->mapping->host;
315 struct buffer_head bh;
316 unsigned long size = PAGE_CACHE_SIZE;
317 u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
318
319 do {
320 bh.b_state = 0;
321 bh.b_size = size;
322 gfs2_block_map(inode, lblock, &bh, 1);
323 if (!buffer_mapped(&bh))
324 return -EIO;
325 size -= bh.b_size;
326 lblock += (bh.b_size >> inode->i_blkbits);
327 } while(size > 0);
328 return 0;
329}
330
331/**
332 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
333 * @vma: The virtual memory area
334 * @page: The page which is about to become writable
335 *
336 * When the page becomes writable, we need to ensure that we have
337 * blocks allocated on disk to back that page.
338 */
339
340static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
341{
342 struct page *page = vmf->page;
343 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
344 struct gfs2_inode *ip = GFS2_I(inode);
345 struct gfs2_sbd *sdp = GFS2_SB(inode);
346 unsigned long last_index;
347 u64 pos = page->index << PAGE_CACHE_SHIFT;
348 unsigned int data_blocks, ind_blocks, rblocks;
349 int alloc_required = 0;
350 struct gfs2_holder gh;
351 struct gfs2_alloc *al;
352 int ret;
353
354 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
355 ret = gfs2_glock_nq(&gh);
356 if (ret)
357 goto out;
358
359 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
360 set_bit(GIF_SW_PAGED, &ip->i_flags);
361
362 ret = gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE, &alloc_required);
363 if (ret || !alloc_required)
364 goto out_unlock;
365 ret = -ENOMEM;
366 al = gfs2_alloc_get(ip);
367 if (al == NULL)
368 goto out_unlock;
369
370 ret = gfs2_quota_lock_check(ip);
371 if (ret)
372 goto out_alloc_put;
373 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
374 al->al_requested = data_blocks + ind_blocks;
375 ret = gfs2_inplace_reserve(ip);
376 if (ret)
377 goto out_quota_unlock;
378
379 rblocks = RES_DINODE + ind_blocks;
380 if (gfs2_is_jdata(ip))
381 rblocks += data_blocks ? data_blocks : 1;
382 if (ind_blocks || data_blocks)
383 rblocks += RES_STATFS + RES_QUOTA;
384 ret = gfs2_trans_begin(sdp, rblocks, 0);
385 if (ret)
386 goto out_trans_fail;
387
388 lock_page(page);
389 ret = -EINVAL;
390 last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT;
391 if (page->index > last_index)
392 goto out_unlock_page;
393 ret = 0;
394 if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping)
395 goto out_unlock_page;
396 if (gfs2_is_stuffed(ip)) {
397 ret = gfs2_unstuff_dinode(ip, page);
398 if (ret)
399 goto out_unlock_page;
400 }
401 ret = gfs2_allocate_page_backing(page);
402
403out_unlock_page:
404 unlock_page(page);
405 gfs2_trans_end(sdp);
406out_trans_fail:
407 gfs2_inplace_release(ip);
408out_quota_unlock:
409 gfs2_quota_unlock(ip);
410out_alloc_put:
411 gfs2_alloc_put(ip);
412out_unlock:
413 gfs2_glock_dq(&gh);
414out:
415 gfs2_holder_uninit(&gh);
416 if (ret == -ENOMEM)
417 ret = VM_FAULT_OOM;
418 else if (ret)
419 ret = VM_FAULT_SIGBUS;
420 return ret;
421}
422
423static struct vm_operations_struct gfs2_vm_ops = {
424 .fault = filemap_fault,
425 .page_mkwrite = gfs2_page_mkwrite,
426};
427
428/**
429 * gfs2_mmap -
430 * @file: The file to map
431 * @vma: The VMA which described the mapping
432 *
433 * There is no need to get a lock here unless we should be updating
434 * atime. We ignore any locking errors since the only consequence is
435 * a missed atime update (which will just be deferred until later).
436 *
437 * Returns: 0
438 */
439
440static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
441{
442 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
443
444 if (!(file->f_flags & O_NOATIME)) {
445 struct gfs2_holder i_gh;
446 int error;
447
448 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
449 error = gfs2_glock_nq(&i_gh);
450 file_accessed(file);
451 if (error == 0)
452 gfs2_glock_dq_uninit(&i_gh);
453 }
454 vma->vm_ops = &gfs2_vm_ops;
455 vma->vm_flags |= VM_CAN_NONLINEAR;
456
457 return 0;
458}
459
460/**
461 * gfs2_open - open a file
462 * @inode: the inode to open
463 * @file: the struct file for this opening
464 *
465 * Returns: errno
466 */
467
468static int gfs2_open(struct inode *inode, struct file *file)
469{
470 struct gfs2_inode *ip = GFS2_I(inode);
471 struct gfs2_holder i_gh;
472 struct gfs2_file *fp;
473 int error;
474
475 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
476 if (!fp)
477 return -ENOMEM;
478
479 mutex_init(&fp->f_fl_mutex);
480
481 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
482 file->private_data = fp;
483
484 if (S_ISREG(ip->i_inode.i_mode)) {
485 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
486 &i_gh);
487 if (error)
488 goto fail;
489
490 if (!(file->f_flags & O_LARGEFILE) &&
491 ip->i_disksize > MAX_NON_LFS) {
492 error = -EOVERFLOW;
493 goto fail_gunlock;
494 }
495
496 gfs2_glock_dq_uninit(&i_gh);
497 }
498
499 return 0;
500
501fail_gunlock:
502 gfs2_glock_dq_uninit(&i_gh);
503fail:
504 file->private_data = NULL;
505 kfree(fp);
506 return error;
507}
508
509/**
510 * gfs2_close - called to close a struct file
511 * @inode: the inode the struct file belongs to
512 * @file: the struct file being closed
513 *
514 * Returns: errno
515 */
516
517static int gfs2_close(struct inode *inode, struct file *file)
518{
519 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
520 struct gfs2_file *fp;
521
522 fp = file->private_data;
523 file->private_data = NULL;
524
525 if (gfs2_assert_warn(sdp, fp))
526 return -EIO;
527
528 kfree(fp);
529
530 return 0;
531}
532
533/**
534 * gfs2_fsync - sync the dirty data for a file (across the cluster)
535 * @file: the file that points to the dentry (we ignore this)
536 * @dentry: the dentry that points to the inode to sync
537 *
538 * The VFS will flush "normal" data for us. We only need to worry
539 * about metadata here. For journaled data, we just do a log flush
540 * as we can't avoid it. Otherwise we can just bale out if datasync
541 * is set. For stuffed inodes we must flush the log in order to
542 * ensure that all data is on disk.
543 *
544 * The call to write_inode_now() is there to write back metadata and
545 * the inode itself. It does also try and write the data, but thats
546 * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite()
547 * for us.
548 *
549 * Returns: errno
550 */
551
552static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
553{
554 struct inode *inode = dentry->d_inode;
555 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
556 int ret = 0;
557
558 if (gfs2_is_jdata(GFS2_I(inode))) {
559 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
560 return 0;
561 }
562
563 if (sync_state != 0) {
564 if (!datasync)
565 ret = write_inode_now(inode, 0);
566
567 if (gfs2_is_stuffed(GFS2_I(inode)))
568 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
569 }
570
571 return ret;
572}
573
574#ifdef CONFIG_GFS2_FS_LOCKING_DLM
575
576/**
577 * gfs2_setlease - acquire/release a file lease
578 * @file: the file pointer
579 * @arg: lease type
580 * @fl: file lock
581 *
582 * We don't currently have a way to enforce a lease across the whole
583 * cluster; until we do, disable leases (by just returning -EINVAL),
584 * unless the administrator has requested purely local locking.
585 *
586 * Returns: errno
587 */
588
589static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
590{
591 return -EINVAL;
592}
593
594/**
595 * gfs2_lock - acquire/release a posix lock on a file
596 * @file: the file pointer
597 * @cmd: either modify or retrieve lock state, possibly wait
598 * @fl: type and range of lock
599 *
600 * Returns: errno
601 */
602
603static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
604{
605 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
606 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
607 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
608
609 if (!(fl->fl_flags & FL_POSIX))
610 return -ENOLCK;
611 if (__mandatory_lock(&ip->i_inode))
612 return -ENOLCK;
613
614 if (cmd == F_CANCELLK) {
615 /* Hack: */
616 cmd = F_SETLK;
617 fl->fl_type = F_UNLCK;
618 }
619 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
620 return -EIO;
621 if (IS_GETLK(cmd))
622 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
623 else if (fl->fl_type == F_UNLCK)
624 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
625 else
626 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
627}
628
629static int do_flock(struct file *file, int cmd, struct file_lock *fl)
630{
631 struct gfs2_file *fp = file->private_data;
632 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
633 struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
634 struct gfs2_glock *gl;
635 unsigned int state;
636 int flags;
637 int error = 0;
638
639 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
640 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
641
642 mutex_lock(&fp->f_fl_mutex);
643
644 gl = fl_gh->gh_gl;
645 if (gl) {
646 if (fl_gh->gh_state == state)
647 goto out;
648 flock_lock_file_wait(file,
649 &(struct file_lock){.fl_type = F_UNLCK});
650 gfs2_glock_dq_wait(fl_gh);
651 gfs2_holder_reinit(state, flags, fl_gh);
652 } else {
653 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
654 &gfs2_flock_glops, CREATE, &gl);
655 if (error)
656 goto out;
657 gfs2_holder_init(gl, state, flags, fl_gh);
658 gfs2_glock_put(gl);
659 }
660 error = gfs2_glock_nq(fl_gh);
661 if (error) {
662 gfs2_holder_uninit(fl_gh);
663 if (error == GLR_TRYFAILED)
664 error = -EAGAIN;
665 } else {
666 error = flock_lock_file_wait(file, fl);
667 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
668 }
669
670out:
671 mutex_unlock(&fp->f_fl_mutex);
672 return error;
673}
674
675static void do_unflock(struct file *file, struct file_lock *fl)
676{
677 struct gfs2_file *fp = file->private_data;
678 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
679
680 mutex_lock(&fp->f_fl_mutex);
681 flock_lock_file_wait(file, fl);
682 if (fl_gh->gh_gl)
683 gfs2_glock_dq_uninit(fl_gh);
684 mutex_unlock(&fp->f_fl_mutex);
685}
686
687/**
688 * gfs2_flock - acquire/release a flock lock on a file
689 * @file: the file pointer
690 * @cmd: either modify or retrieve lock state, possibly wait
691 * @fl: type and range of lock
692 *
693 * Returns: errno
694 */
695
696static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
697{
698 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
699
700 if (!(fl->fl_flags & FL_FLOCK))
701 return -ENOLCK;
702 if (__mandatory_lock(&ip->i_inode))
703 return -ENOLCK;
704
705 if (fl->fl_type == F_UNLCK) {
706 do_unflock(file, fl);
707 return 0;
708 } else {
709 return do_flock(file, cmd, fl);
710 }
711}
712
713const struct file_operations gfs2_file_fops = {
714 .llseek = gfs2_llseek,
715 .read = do_sync_read,
716 .aio_read = generic_file_aio_read,
717 .write = do_sync_write,
718 .aio_write = generic_file_aio_write,
719 .unlocked_ioctl = gfs2_ioctl,
720 .mmap = gfs2_mmap,
721 .open = gfs2_open,
722 .release = gfs2_close,
723 .fsync = gfs2_fsync,
724 .lock = gfs2_lock,
725 .flock = gfs2_flock,
726 .splice_read = generic_file_splice_read,
727 .splice_write = generic_file_splice_write,
728 .setlease = gfs2_setlease,
729};
730
731const struct file_operations gfs2_dir_fops = {
732 .readdir = gfs2_readdir,
733 .unlocked_ioctl = gfs2_ioctl,
734 .open = gfs2_open,
735 .release = gfs2_close,
736 .fsync = gfs2_fsync,
737 .lock = gfs2_lock,
738 .flock = gfs2_flock,
739};
740
741#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
742
743const struct file_operations gfs2_file_fops_nolock = {
744 .llseek = gfs2_llseek,
745 .read = do_sync_read,
746 .aio_read = generic_file_aio_read,
747 .write = do_sync_write,
748 .aio_write = generic_file_aio_write,
749 .unlocked_ioctl = gfs2_ioctl,
750 .mmap = gfs2_mmap,
751 .open = gfs2_open,
752 .release = gfs2_close,
753 .fsync = gfs2_fsync,
754 .splice_read = generic_file_splice_read,
755 .splice_write = generic_file_splice_write,
756 .setlease = generic_setlease,
757};
758
759const struct file_operations gfs2_dir_fops_nolock = {
760 .readdir = gfs2_readdir,
761 .unlocked_ioctl = gfs2_ioctl,
762 .open = gfs2_open,
763 .release = gfs2_close,
764 .fsync = gfs2_fsync,
765};
766
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-26 10:06:16 -0500