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GFS2: Rationalise header files
[linux-2.6.git] / fs / gfs2 / ops_file.c
blobfcfaaefc92fbc2b8fd4a19b7bf65e8513f3411ac
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/lm_interface.h>
24 #include <linux/writeback.h>
25 #include <asm/uaccess.h>
26
27 #include "gfs2.h"
28 #include "incore.h"
29 #include "bmap.h"
30 #include "dir.h"
31 #include "glock.h"
32 #include "glops.h"
33 #include "inode.h"
34 #include "log.h"
35 #include "meta_io.h"
36 #include "quota.h"
37 #include "rgrp.h"
38 #include "trans.h"
39 #include "util.h"
40 #include "eaops.h"
41 #include "ops_address.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
55 static 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 if (origin == 2) {
62 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
63 &i_gh);
64 if (!error) {
65 error = generic_file_llseek_unlocked(file, offset, origin);
66 gfs2_glock_dq_uninit(&i_gh);
67 }
68 } else
69 error = generic_file_llseek_unlocked(file, offset, origin);
70
71 return error;
72 }
73
74 /**
75 * gfs2_readdir - Read directory entries from a directory
76 * @file: The directory to read from
77 * @dirent: Buffer for dirents
78 * @filldir: Function used to do the copying
79 *
80 * Returns: errno
81 */
82
83 static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir)
84 {
85 struct inode *dir = file->f_mapping->host;
86 struct gfs2_inode *dip = GFS2_I(dir);
87 struct gfs2_holder d_gh;
88 u64 offset = file->f_pos;
89 int error;
90
91 gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
92 error = gfs2_glock_nq(&d_gh);
93 if (error) {
94 gfs2_holder_uninit(&d_gh);
95 return error;
96 }
97
98 error = gfs2_dir_read(dir, &offset, dirent, filldir);
99
100 gfs2_glock_dq_uninit(&d_gh);
101
102 file->f_pos = offset;
103
104 return error;
105 }
106
107 /**
108 * fsflags_cvt
109 * @table: A table of 32 u32 flags
110 * @val: a 32 bit value to convert
111 *
112 * This function can be used to convert between fsflags values and
113 * GFS2's own flags values.
114 *
115 * Returns: the converted flags
116 */
117 static u32 fsflags_cvt(const u32 *table, u32 val)
118 {
119 u32 res = 0;
120 while(val) {
121 if (val & 1)
122 res |= *table;
123 table++;
124 val >>= 1;
125 }
126 return res;
127 }
128
129 static const u32 fsflags_to_gfs2[32] = {
130 [3] = GFS2_DIF_SYNC,
131 [4] = GFS2_DIF_IMMUTABLE,
132 [5] = GFS2_DIF_APPENDONLY,
133 [7] = GFS2_DIF_NOATIME,
134 [12] = GFS2_DIF_EXHASH,
135 [14] = GFS2_DIF_INHERIT_JDATA,
136 };
137
138 static const u32 gfs2_to_fsflags[32] = {
139 [gfs2fl_Sync] = FS_SYNC_FL,
140 [gfs2fl_Immutable] = FS_IMMUTABLE_FL,
141 [gfs2fl_AppendOnly] = FS_APPEND_FL,
142 [gfs2fl_NoAtime] = FS_NOATIME_FL,
143 [gfs2fl_ExHash] = FS_INDEX_FL,
144 [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
145 };
146
147 static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
148 {
149 struct inode *inode = filp->f_path.dentry->d_inode;
150 struct gfs2_inode *ip = GFS2_I(inode);
151 struct gfs2_holder gh;
152 int error;
153 u32 fsflags;
154
155 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
156 error = gfs2_glock_nq(&gh);
157 if (error)
158 return error;
159
160 fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_di.di_flags);
161 if (!S_ISDIR(inode->i_mode) && ip->i_di.di_flags & GFS2_DIF_JDATA)
162 fsflags |= FS_JOURNAL_DATA_FL;
163 if (put_user(fsflags, ptr))
164 error = -EFAULT;
165
166 gfs2_glock_dq(&gh);
167 gfs2_holder_uninit(&gh);
168 return error;
169 }
170
171 void gfs2_set_inode_flags(struct inode *inode)
172 {
173 struct gfs2_inode *ip = GFS2_I(inode);
174 struct gfs2_dinode_host *di = &ip->i_di;
175 unsigned int flags = inode->i_flags;
176
177 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
178 if (di->di_flags & GFS2_DIF_IMMUTABLE)
179 flags |= S_IMMUTABLE;
180 if (di->di_flags & GFS2_DIF_APPENDONLY)
181 flags |= S_APPEND;
182 if (di->di_flags & GFS2_DIF_NOATIME)
183 flags |= S_NOATIME;
184 if (di->di_flags & 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 */
205 static 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_di.di_flags;
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_di.di_flags = new_flags;
263 gfs2_dinode_out(ip, bh->b_data);
264 brelse(bh);
265 gfs2_set_inode_flags(inode);
266 gfs2_set_aops(inode);
267 out_trans_end:
268 gfs2_trans_end(sdp);
269 out:
270 gfs2_glock_dq_uninit(&gh);
271 out_drop_write:
272 mnt_drop_write(filp->f_path.mnt);
273 return error;
274 }
275
276 static 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
291 static 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
312 static 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
340 static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct page *page)
341 {
342 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
343 struct gfs2_inode *ip = GFS2_I(inode);
344 struct gfs2_sbd *sdp = GFS2_SB(inode);
345 unsigned long last_index;
346 u64 pos = page->index << (PAGE_CACHE_SIZE - inode->i_blkbits);
347 unsigned int data_blocks, ind_blocks, rblocks;
348 int alloc_required = 0;
349 struct gfs2_holder gh;
350 struct gfs2_alloc *al;
351 int ret;
352
353 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
354 ret = gfs2_glock_nq(&gh);
355 if (ret)
356 goto out;
357
358 set_bit(GIF_SW_PAGED, &ip->i_flags);
359 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
360 ret = gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE, &alloc_required);
361 if (ret || !alloc_required)
362 goto out_unlock;
363 ret = -ENOMEM;
364 al = gfs2_alloc_get(ip);
365 if (al == NULL)
366 goto out_unlock;
367
368 ret = gfs2_quota_lock_check(ip);
369 if (ret)
370 goto out_alloc_put;
371 al->al_requested = data_blocks + ind_blocks;
372 ret = gfs2_inplace_reserve(ip);
373 if (ret)
374 goto out_quota_unlock;
375
376 rblocks = RES_DINODE + ind_blocks;
377 if (gfs2_is_jdata(ip))
378 rblocks += data_blocks ? data_blocks : 1;
379 if (ind_blocks || data_blocks)
380 rblocks += RES_STATFS + RES_QUOTA;
381 ret = gfs2_trans_begin(sdp, rblocks, 0);
382 if (ret)
383 goto out_trans_fail;
384
385 lock_page(page);
386 ret = -EINVAL;
387 last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT;
388 if (page->index > last_index)
389 goto out_unlock_page;
390 ret = 0;
391 if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping)
392 goto out_unlock_page;
393 if (gfs2_is_stuffed(ip)) {
394 ret = gfs2_unstuff_dinode(ip, page);
395 if (ret)
396 goto out_unlock_page;
397 }
398 ret = gfs2_allocate_page_backing(page);
399
400 out_unlock_page:
401 unlock_page(page);
402 gfs2_trans_end(sdp);
403 out_trans_fail:
404 gfs2_inplace_release(ip);
405 out_quota_unlock:
406 gfs2_quota_unlock(ip);
407 out_alloc_put:
408 gfs2_alloc_put(ip);
409 out_unlock:
410 gfs2_glock_dq(&gh);
411 out:
412 gfs2_holder_uninit(&gh);
413 return ret;
414 }
415
416 static struct vm_operations_struct gfs2_vm_ops = {
417 .fault = filemap_fault,
418 .page_mkwrite = gfs2_page_mkwrite,
419 };
420
421
422 /**
423 * gfs2_mmap -
424 * @file: The file to map
425 * @vma: The VMA which described the mapping
426 *
427 * Returns: 0 or error code
428 */
429
430 static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
431 {
432 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
433 struct gfs2_holder i_gh;
434 int error;
435
436 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
437 error = gfs2_glock_nq(&i_gh);
438 if (error) {
439 gfs2_holder_uninit(&i_gh);
440 return error;
441 }
442
443 vma->vm_ops = &gfs2_vm_ops;
444
445 gfs2_glock_dq_uninit(&i_gh);
446
447 return error;
448 }
449
450 /**
451 * gfs2_open - open a file
452 * @inode: the inode to open
453 * @file: the struct file for this opening
454 *
455 * Returns: errno
456 */
457
458 static int gfs2_open(struct inode *inode, struct file *file)
459 {
460 struct gfs2_inode *ip = GFS2_I(inode);
461 struct gfs2_holder i_gh;
462 struct gfs2_file *fp;
463 int error;
464
465 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
466 if (!fp)
467 return -ENOMEM;
468
469 mutex_init(&fp->f_fl_mutex);
470
471 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
472 file->private_data = fp;
473
474 if (S_ISREG(ip->i_inode.i_mode)) {
475 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
476 &i_gh);
477 if (error)
478 goto fail;
479
480 if (!(file->f_flags & O_LARGEFILE) &&
481 ip->i_di.di_size > MAX_NON_LFS) {
482 error = -EOVERFLOW;
483 goto fail_gunlock;
484 }
485
486 gfs2_glock_dq_uninit(&i_gh);
487 }
488
489 return 0;
490
491 fail_gunlock:
492 gfs2_glock_dq_uninit(&i_gh);
493 fail:
494 file->private_data = NULL;
495 kfree(fp);
496 return error;
497 }
498
499 /**
500 * gfs2_close - called to close a struct file
501 * @inode: the inode the struct file belongs to
502 * @file: the struct file being closed
503 *
504 * Returns: errno
505 */
506
507 static int gfs2_close(struct inode *inode, struct file *file)
508 {
509 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
510 struct gfs2_file *fp;
511
512 fp = file->private_data;
513 file->private_data = NULL;
514
515 if (gfs2_assert_warn(sdp, fp))
516 return -EIO;
517
518 kfree(fp);
519
520 return 0;
521 }
522
523 /**
524 * gfs2_fsync - sync the dirty data for a file (across the cluster)
525 * @file: the file that points to the dentry (we ignore this)
526 * @dentry: the dentry that points to the inode to sync
527 *
528 * The VFS will flush "normal" data for us. We only need to worry
529 * about metadata here. For journaled data, we just do a log flush
530 * as we can't avoid it. Otherwise we can just bale out if datasync
531 * is set. For stuffed inodes we must flush the log in order to
532 * ensure that all data is on disk.
533 *
534 * The call to write_inode_now() is there to write back metadata and
535 * the inode itself. It does also try and write the data, but thats
536 * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite()
537 * for us.
538 *
539 * Returns: errno
540 */
541
542 static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
543 {
544 struct inode *inode = dentry->d_inode;
545 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
546 int ret = 0;
547
548 if (gfs2_is_jdata(GFS2_I(inode))) {
549 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
550 return 0;
551 }
552
553 if (sync_state != 0) {
554 if (!datasync)
555 ret = write_inode_now(inode, 0);
556
557 if (gfs2_is_stuffed(GFS2_I(inode)))
558 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
559 }
560
561 return ret;
562 }
563
564 /**
565 * gfs2_setlease - acquire/release a file lease
566 * @file: the file pointer
567 * @arg: lease type
568 * @fl: file lock
569 *
570 * Returns: errno
571 */
572
573 static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
574 {
575 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
576
577 /*
578 * We don't currently have a way to enforce a lease across the whole
579 * cluster; until we do, disable leases (by just returning -EINVAL),
580 * unless the administrator has requested purely local locking.
581 */
582 if (!sdp->sd_args.ar_localflocks)
583 return -EINVAL;
584 return generic_setlease(file, arg, fl);
585 }
586
587 static int gfs2_lm_plock_get(struct gfs2_sbd *sdp, struct lm_lockname *name,
588 struct file *file, struct file_lock *fl)
589 {
590 int error = -EIO;
591 if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
592 error = sdp->sd_lockstruct.ls_ops->lm_plock_get(
593 sdp->sd_lockstruct.ls_lockspace, name, file, fl);
594 return error;
595 }
596
597 static int gfs2_lm_plock(struct gfs2_sbd *sdp, struct lm_lockname *name,
598 struct file *file, int cmd, struct file_lock *fl)
599 {
600 int error = -EIO;
601 if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
602 error = sdp->sd_lockstruct.ls_ops->lm_plock(
603 sdp->sd_lockstruct.ls_lockspace, name, file, cmd, fl);
604 return error;
605 }
606
607 static int gfs2_lm_punlock(struct gfs2_sbd *sdp, struct lm_lockname *name,
608 struct file *file, struct file_lock *fl)
609 {
610 int error = -EIO;
611 if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
612 error = sdp->sd_lockstruct.ls_ops->lm_punlock(
613 sdp->sd_lockstruct.ls_lockspace, name, file, fl);
614 return error;
615 }
616
617 /**
618 * gfs2_lock - acquire/release a posix lock on a file
619 * @file: the file pointer
620 * @cmd: either modify or retrieve lock state, possibly wait
621 * @fl: type and range of lock
622 *
623 * Returns: errno
624 */
625
626 static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
627 {
628 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
629 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
630 struct lm_lockname name =
631 { .ln_number = ip->i_no_addr,
632 .ln_type = LM_TYPE_PLOCK };
633
634 if (!(fl->fl_flags & FL_POSIX))
635 return -ENOLCK;
636 if (__mandatory_lock(&ip->i_inode))
637 return -ENOLCK;
638
639 if (cmd == F_CANCELLK) {
640 /* Hack: */
641 cmd = F_SETLK;
642 fl->fl_type = F_UNLCK;
643 }
644 if (IS_GETLK(cmd))
645 return gfs2_lm_plock_get(sdp, &name, file, fl);
646 else if (fl->fl_type == F_UNLCK)
647 return gfs2_lm_punlock(sdp, &name, file, fl);
648 else
649 return gfs2_lm_plock(sdp, &name, file, cmd, fl);
650 }
651
652 static int do_flock(struct file *file, int cmd, struct file_lock *fl)
653 {
654 struct gfs2_file *fp = file->private_data;
655 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
656 struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
657 struct gfs2_glock *gl;
658 unsigned int state;
659 int flags;
660 int error = 0;
661
662 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
663 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
664
665 mutex_lock(&fp->f_fl_mutex);
666
667 gl = fl_gh->gh_gl;
668 if (gl) {
669 if (fl_gh->gh_state == state)
670 goto out;
671 flock_lock_file_wait(file,
672 &(struct file_lock){.fl_type = F_UNLCK});
673 gfs2_glock_dq_wait(fl_gh);
674 gfs2_holder_reinit(state, flags, fl_gh);
675 } else {
676 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
677 &gfs2_flock_glops, CREATE, &gl);
678 if (error)
679 goto out;
680 gfs2_holder_init(gl, state, flags, fl_gh);
681 gfs2_glock_put(gl);
682 }
683 error = gfs2_glock_nq(fl_gh);
684 if (error) {
685 gfs2_holder_uninit(fl_gh);
686 if (error == GLR_TRYFAILED)
687 error = -EAGAIN;
688 } else {
689 error = flock_lock_file_wait(file, fl);
690 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
691 }
692
693 out:
694 mutex_unlock(&fp->f_fl_mutex);
695 return error;
696 }
697
698 static void do_unflock(struct file *file, struct file_lock *fl)
699 {
700 struct gfs2_file *fp = file->private_data;
701 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
702
703 mutex_lock(&fp->f_fl_mutex);
704 flock_lock_file_wait(file, fl);
705 if (fl_gh->gh_gl)
706 gfs2_glock_dq_uninit(fl_gh);
707 mutex_unlock(&fp->f_fl_mutex);
708 }
709
710 /**
711 * gfs2_flock - acquire/release a flock lock on a file
712 * @file: the file pointer
713 * @cmd: either modify or retrieve lock state, possibly wait
714 * @fl: type and range of lock
715 *
716 * Returns: errno
717 */
718
719 static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
720 {
721 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
722
723 if (!(fl->fl_flags & FL_FLOCK))
724 return -ENOLCK;
725 if (__mandatory_lock(&ip->i_inode))
726 return -ENOLCK;
727
728 if (fl->fl_type == F_UNLCK) {
729 do_unflock(file, fl);
730 return 0;
731 } else {
732 return do_flock(file, cmd, fl);
733 }
734 }
735
736 const struct file_operations gfs2_file_fops = {
737 .llseek = gfs2_llseek,
738 .read = do_sync_read,
739 .aio_read = generic_file_aio_read,
740 .write = do_sync_write,
741 .aio_write = generic_file_aio_write,
742 .unlocked_ioctl = gfs2_ioctl,
743 .mmap = gfs2_mmap,
744 .open = gfs2_open,
745 .release = gfs2_close,
746 .fsync = gfs2_fsync,
747 .lock = gfs2_lock,
748 .flock = gfs2_flock,
749 .splice_read = generic_file_splice_read,
750 .splice_write = generic_file_splice_write,
751 .setlease = gfs2_setlease,
752 };
753
754 const struct file_operations gfs2_dir_fops = {
755 .readdir = gfs2_readdir,
756 .unlocked_ioctl = gfs2_ioctl,
757 .open = gfs2_open,
758 .release = gfs2_close,
759 .fsync = gfs2_fsync,
760 .lock = gfs2_lock,
761 .flock = gfs2_flock,
762 };
763
764 const struct file_operations gfs2_file_fops_nolock = {
765 .llseek = gfs2_llseek,
766 .read = do_sync_read,
767 .aio_read = generic_file_aio_read,
768 .write = do_sync_write,
769 .aio_write = generic_file_aio_write,
770 .unlocked_ioctl = gfs2_ioctl,
771 .mmap = gfs2_mmap,
772 .open = gfs2_open,
773 .release = gfs2_close,
774 .fsync = gfs2_fsync,
775 .splice_read = generic_file_splice_read,
776 .splice_write = generic_file_splice_write,
777 .setlease = gfs2_setlease,
778 };
779
780 const struct file_operations gfs2_dir_fops_nolock = {
781 .readdir = gfs2_readdir,
782 .unlocked_ioctl = gfs2_ioctl,
783 .open = gfs2_open,
784 .release = gfs2_close,
785 .fsync = gfs2_fsync,
786 };
787
Linus' kernel tree