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V4L/DVB (10433): cx18: Defer A/V core initialization until a valid cx18_av_cmd arrives
[linux-2.6/mini2440.git] / fs / gfs2 / ops_file.c
blob3b9e8de3500be1c40b2fbb798cb8dcdc8d4b51b5
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
56 static 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
84 static 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 */
118 static 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
130 static 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
139 static 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
148 static 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
172 void 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 */
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_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);
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_SHIFT;
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(GLF_DIRTY, &ip->i_gl->gl_flags);
359 set_bit(GIF_SW_PAGED, &ip->i_flags);
360
361 ret = gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE, &alloc_required);
362 if (ret || !alloc_required)
363 goto out_unlock;
364 ret = -ENOMEM;
365 al = gfs2_alloc_get(ip);
366 if (al == NULL)
367 goto out_unlock;
368
369 ret = gfs2_quota_lock_check(ip);
370 if (ret)
371 goto out_alloc_put;
372 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
373 al->al_requested = data_blocks + ind_blocks;
374 ret = gfs2_inplace_reserve(ip);
375 if (ret)
376 goto out_quota_unlock;
377
378 rblocks = RES_DINODE + ind_blocks;
379 if (gfs2_is_jdata(ip))
380 rblocks += data_blocks ? data_blocks : 1;
381 if (ind_blocks || data_blocks)
382 rblocks += RES_STATFS + RES_QUOTA;
383 ret = gfs2_trans_begin(sdp, rblocks, 0);
384 if (ret)
385 goto out_trans_fail;
386
387 lock_page(page);
388 ret = -EINVAL;
389 last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT;
390 if (page->index > last_index)
391 goto out_unlock_page;
392 ret = 0;
393 if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping)
394 goto out_unlock_page;
395 if (gfs2_is_stuffed(ip)) {
396 ret = gfs2_unstuff_dinode(ip, page);
397 if (ret)
398 goto out_unlock_page;
399 }
400 ret = gfs2_allocate_page_backing(page);
401
402 out_unlock_page:
403 unlock_page(page);
404 gfs2_trans_end(sdp);
405 out_trans_fail:
406 gfs2_inplace_release(ip);
407 out_quota_unlock:
408 gfs2_quota_unlock(ip);
409 out_alloc_put:
410 gfs2_alloc_put(ip);
411 out_unlock:
412 gfs2_glock_dq(&gh);
413 out:
414 gfs2_holder_uninit(&gh);
415 return ret;
416 }
417
418 static struct vm_operations_struct gfs2_vm_ops = {
419 .fault = filemap_fault,
420 .page_mkwrite = gfs2_page_mkwrite,
421 };
422
423
424 /**
425 * gfs2_mmap -
426 * @file: The file to map
427 * @vma: The VMA which described the mapping
428 *
429 * Returns: 0 or error code
430 */
431
432 static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
433 {
434 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
435 struct gfs2_holder i_gh;
436 int error;
437
438 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
439 error = gfs2_glock_nq(&i_gh);
440 if (error) {
441 gfs2_holder_uninit(&i_gh);
442 return error;
443 }
444
445 vma->vm_ops = &gfs2_vm_ops;
446
447 gfs2_glock_dq_uninit(&i_gh);
448
449 return error;
450 }
451
452 /**
453 * gfs2_open - open a file
454 * @inode: the inode to open
455 * @file: the struct file for this opening
456 *
457 * Returns: errno
458 */
459
460 static int gfs2_open(struct inode *inode, struct file *file)
461 {
462 struct gfs2_inode *ip = GFS2_I(inode);
463 struct gfs2_holder i_gh;
464 struct gfs2_file *fp;
465 int error;
466
467 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
468 if (!fp)
469 return -ENOMEM;
470
471 mutex_init(&fp->f_fl_mutex);
472
473 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
474 file->private_data = fp;
475
476 if (S_ISREG(ip->i_inode.i_mode)) {
477 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
478 &i_gh);
479 if (error)
480 goto fail;
481
482 if (!(file->f_flags & O_LARGEFILE) &&
483 ip->i_disksize > MAX_NON_LFS) {
484 error = -EOVERFLOW;
485 goto fail_gunlock;
486 }
487
488 gfs2_glock_dq_uninit(&i_gh);
489 }
490
491 return 0;
492
493 fail_gunlock:
494 gfs2_glock_dq_uninit(&i_gh);
495 fail:
496 file->private_data = NULL;
497 kfree(fp);
498 return error;
499 }
500
501 /**
502 * gfs2_close - called to close a struct file
503 * @inode: the inode the struct file belongs to
504 * @file: the struct file being closed
505 *
506 * Returns: errno
507 */
508
509 static int gfs2_close(struct inode *inode, struct file *file)
510 {
511 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
512 struct gfs2_file *fp;
513
514 fp = file->private_data;
515 file->private_data = NULL;
516
517 if (gfs2_assert_warn(sdp, fp))
518 return -EIO;
519
520 kfree(fp);
521
522 return 0;
523 }
524
525 /**
526 * gfs2_fsync - sync the dirty data for a file (across the cluster)
527 * @file: the file that points to the dentry (we ignore this)
528 * @dentry: the dentry that points to the inode to sync
529 *
530 * The VFS will flush "normal" data for us. We only need to worry
531 * about metadata here. For journaled data, we just do a log flush
532 * as we can't avoid it. Otherwise we can just bale out if datasync
533 * is set. For stuffed inodes we must flush the log in order to
534 * ensure that all data is on disk.
535 *
536 * The call to write_inode_now() is there to write back metadata and
537 * the inode itself. It does also try and write the data, but thats
538 * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite()
539 * for us.
540 *
541 * Returns: errno
542 */
543
544 static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
545 {
546 struct inode *inode = dentry->d_inode;
547 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
548 int ret = 0;
549
550 if (gfs2_is_jdata(GFS2_I(inode))) {
551 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
552 return 0;
553 }
554
555 if (sync_state != 0) {
556 if (!datasync)
557 ret = write_inode_now(inode, 0);
558
559 if (gfs2_is_stuffed(GFS2_I(inode)))
560 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
561 }
562
563 return ret;
564 }
565
566 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
567
568 /**
569 * gfs2_setlease - acquire/release a file lease
570 * @file: the file pointer
571 * @arg: lease type
572 * @fl: file lock
573 *
574 * We don't currently have a way to enforce a lease across the whole
575 * cluster; until we do, disable leases (by just returning -EINVAL),
576 * unless the administrator has requested purely local locking.
577 *
578 * Returns: errno
579 */
580
581 static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
582 {
583 return -EINVAL;
584 }
585
586 /**
587 * gfs2_lock - acquire/release a posix lock on a file
588 * @file: the file pointer
589 * @cmd: either modify or retrieve lock state, possibly wait
590 * @fl: type and range of lock
591 *
592 * Returns: errno
593 */
594
595 static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
596 {
597 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
598 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
599 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
600
601 if (!(fl->fl_flags & FL_POSIX))
602 return -ENOLCK;
603 if (__mandatory_lock(&ip->i_inode))
604 return -ENOLCK;
605
606 if (cmd == F_CANCELLK) {
607 /* Hack: */
608 cmd = F_SETLK;
609 fl->fl_type = F_UNLCK;
610 }
611 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
612 return -EIO;
613 if (IS_GETLK(cmd))
614 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
615 else if (fl->fl_type == F_UNLCK)
616 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
617 else
618 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
619 }
620
621 static int do_flock(struct file *file, int cmd, struct file_lock *fl)
622 {
623 struct gfs2_file *fp = file->private_data;
624 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
625 struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
626 struct gfs2_glock *gl;
627 unsigned int state;
628 int flags;
629 int error = 0;
630
631 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
632 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
633
634 mutex_lock(&fp->f_fl_mutex);
635
636 gl = fl_gh->gh_gl;
637 if (gl) {
638 if (fl_gh->gh_state == state)
639 goto out;
640 flock_lock_file_wait(file,
641 &(struct file_lock){.fl_type = F_UNLCK});
642 gfs2_glock_dq_wait(fl_gh);
643 gfs2_holder_reinit(state, flags, fl_gh);
644 } else {
645 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
646 &gfs2_flock_glops, CREATE, &gl);
647 if (error)
648 goto out;
649 gfs2_holder_init(gl, state, flags, fl_gh);
650 gfs2_glock_put(gl);
651 }
652 error = gfs2_glock_nq(fl_gh);
653 if (error) {
654 gfs2_holder_uninit(fl_gh);
655 if (error == GLR_TRYFAILED)
656 error = -EAGAIN;
657 } else {
658 error = flock_lock_file_wait(file, fl);
659 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
660 }
661
662 out:
663 mutex_unlock(&fp->f_fl_mutex);
664 return error;
665 }
666
667 static void do_unflock(struct file *file, struct file_lock *fl)
668 {
669 struct gfs2_file *fp = file->private_data;
670 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
671
672 mutex_lock(&fp->f_fl_mutex);
673 flock_lock_file_wait(file, fl);
674 if (fl_gh->gh_gl)
675 gfs2_glock_dq_uninit(fl_gh);
676 mutex_unlock(&fp->f_fl_mutex);
677 }
678
679 /**
680 * gfs2_flock - acquire/release a flock lock on a file
681 * @file: the file pointer
682 * @cmd: either modify or retrieve lock state, possibly wait
683 * @fl: type and range of lock
684 *
685 * Returns: errno
686 */
687
688 static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
689 {
690 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
691
692 if (!(fl->fl_flags & FL_FLOCK))
693 return -ENOLCK;
694 if (__mandatory_lock(&ip->i_inode))
695 return -ENOLCK;
696
697 if (fl->fl_type == F_UNLCK) {
698 do_unflock(file, fl);
699 return 0;
700 } else {
701 return do_flock(file, cmd, fl);
702 }
703 }
704
705 const struct file_operations *gfs2_file_fops = &(const struct file_operations){
706 .llseek = gfs2_llseek,
707 .read = do_sync_read,
708 .aio_read = generic_file_aio_read,
709 .write = do_sync_write,
710 .aio_write = generic_file_aio_write,
711 .unlocked_ioctl = gfs2_ioctl,
712 .mmap = gfs2_mmap,
713 .open = gfs2_open,
714 .release = gfs2_close,
715 .fsync = gfs2_fsync,
716 .lock = gfs2_lock,
717 .flock = gfs2_flock,
718 .splice_read = generic_file_splice_read,
719 .splice_write = generic_file_splice_write,
720 .setlease = gfs2_setlease,
721 };
722
723 const struct file_operations *gfs2_dir_fops = &(const struct file_operations){
724 .readdir = gfs2_readdir,
725 .unlocked_ioctl = gfs2_ioctl,
726 .open = gfs2_open,
727 .release = gfs2_close,
728 .fsync = gfs2_fsync,
729 .lock = gfs2_lock,
730 .flock = gfs2_flock,
731 };
732
733 #endif /* CONFIG_GFS2_FS_LOCKING_DLM */
734
735 const struct file_operations *gfs2_file_fops_nolock = &(const struct file_operations){
736 .llseek = gfs2_llseek,
737 .read = do_sync_read,
738 .aio_read = generic_file_aio_read,
739 .write = do_sync_write,
740 .aio_write = generic_file_aio_write,
741 .unlocked_ioctl = gfs2_ioctl,
742 .mmap = gfs2_mmap,
743 .open = gfs2_open,
744 .release = gfs2_close,
745 .fsync = gfs2_fsync,
746 .splice_read = generic_file_splice_read,
747 .splice_write = generic_file_splice_write,
748 .setlease = generic_setlease,
749 };
750
751 const struct file_operations *gfs2_dir_fops_nolock = &(const struct file_operations){
752 .readdir = gfs2_readdir,
753 .unlocked_ioctl = gfs2_ioctl,
754 .open = gfs2_open,
755 .release = gfs2_close,
756 .fsync = gfs2_fsync,
757 };
758
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