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b43legacy: avoid PPC fault during resume
[linux-2.6/mini2440.git] / fs / gfs2 / file.c
blob73318a3ce6f1b1651f7fdaeb2ec985c45e7f76e0
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
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_diskflags);
161 if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & 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 unsigned int flags = inode->i_flags;
175
176 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
177 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
178 flags |= S_IMMUTABLE;
179 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
180 flags |= S_APPEND;
181 if (ip->i_diskflags & GFS2_DIF_NOATIME)
182 flags |= S_NOATIME;
183 if (ip->i_diskflags & GFS2_DIF_SYNC)
184 flags |= S_SYNC;
185 inode->i_flags = flags;
186 }
187
188 /* Flags that can be set by user space */
189 #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
190 GFS2_DIF_IMMUTABLE| \
191 GFS2_DIF_APPENDONLY| \
192 GFS2_DIF_NOATIME| \
193 GFS2_DIF_SYNC| \
194 GFS2_DIF_SYSTEM| \
195 GFS2_DIF_INHERIT_JDATA)
196
197 /**
198 * gfs2_set_flags - set flags on an inode
199 * @inode: The inode
200 * @flags: The flags to set
201 * @mask: Indicates which flags are valid
202 *
203 */
204 static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
205 {
206 struct inode *inode = filp->f_path.dentry->d_inode;
207 struct gfs2_inode *ip = GFS2_I(inode);
208 struct gfs2_sbd *sdp = GFS2_SB(inode);
209 struct buffer_head *bh;
210 struct gfs2_holder gh;
211 int error;
212 u32 new_flags, flags;
213
214 error = mnt_want_write(filp->f_path.mnt);
215 if (error)
216 return error;
217
218 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
219 if (error)
220 goto out_drop_write;
221
222 flags = ip->i_diskflags;
223 new_flags = (flags & ~mask) | (reqflags & mask);
224 if ((new_flags ^ flags) == 0)
225 goto out;
226
227 error = -EINVAL;
228 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
229 goto out;
230
231 error = -EPERM;
232 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
233 goto out;
234 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
235 goto out;
236 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
237 !capable(CAP_LINUX_IMMUTABLE))
238 goto out;
239 if (!IS_IMMUTABLE(inode)) {
240 error = gfs2_permission(inode, MAY_WRITE);
241 if (error)
242 goto out;
243 }
244 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
245 if (flags & GFS2_DIF_JDATA)
246 gfs2_log_flush(sdp, ip->i_gl);
247 error = filemap_fdatawrite(inode->i_mapping);
248 if (error)
249 goto out;
250 error = filemap_fdatawait(inode->i_mapping);
251 if (error)
252 goto out;
253 }
254 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
255 if (error)
256 goto out;
257 error = gfs2_meta_inode_buffer(ip, &bh);
258 if (error)
259 goto out_trans_end;
260 gfs2_trans_add_bh(ip->i_gl, bh, 1);
261 ip->i_diskflags = new_flags;
262 gfs2_dinode_out(ip, bh->b_data);
263 brelse(bh);
264 gfs2_set_inode_flags(inode);
265 gfs2_set_aops(inode);
266 out_trans_end:
267 gfs2_trans_end(sdp);
268 out:
269 gfs2_glock_dq_uninit(&gh);
270 out_drop_write:
271 mnt_drop_write(filp->f_path.mnt);
272 return error;
273 }
274
275 static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
276 {
277 struct inode *inode = filp->f_path.dentry->d_inode;
278 u32 fsflags, gfsflags;
279 if (get_user(fsflags, ptr))
280 return -EFAULT;
281 gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
282 if (!S_ISDIR(inode->i_mode)) {
283 if (gfsflags & GFS2_DIF_INHERIT_JDATA)
284 gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);
285 return do_gfs2_set_flags(filp, gfsflags, ~0);
286 }
287 return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA);
288 }
289
290 static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
291 {
292 switch(cmd) {
293 case FS_IOC_GETFLAGS:
294 return gfs2_get_flags(filp, (u32 __user *)arg);
295 case FS_IOC_SETFLAGS:
296 return gfs2_set_flags(filp, (u32 __user *)arg);
297 }
298 return -ENOTTY;
299 }
300
301 /**
302 * gfs2_allocate_page_backing - Use bmap to allocate blocks
303 * @page: The (locked) page to allocate backing for
304 *
305 * We try to allocate all the blocks required for the page in
306 * one go. This might fail for various reasons, so we keep
307 * trying until all the blocks to back this page are allocated.
308 * If some of the blocks are already allocated, thats ok too.
309 */
310
311 static int gfs2_allocate_page_backing(struct page *page)
312 {
313 struct inode *inode = page->mapping->host;
314 struct buffer_head bh;
315 unsigned long size = PAGE_CACHE_SIZE;
316 u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
317
318 do {
319 bh.b_state = 0;
320 bh.b_size = size;
321 gfs2_block_map(inode, lblock, &bh, 1);
322 if (!buffer_mapped(&bh))
323 return -EIO;
324 size -= bh.b_size;
325 lblock += (bh.b_size >> inode->i_blkbits);
326 } while(size > 0);
327 return 0;
328 }
329
330 /**
331 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
332 * @vma: The virtual memory area
333 * @page: The page which is about to become writable
334 *
335 * When the page becomes writable, we need to ensure that we have
336 * blocks allocated on disk to back that page.
337 */
338
339 static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
340 {
341 struct page *page = vmf->page;
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 if (ret == -ENOMEM)
416 ret = VM_FAULT_OOM;
417 else if (ret)
418 ret = VM_FAULT_SIGBUS;
419 return ret;
420 }
421
422 static struct vm_operations_struct gfs2_vm_ops = {
423 .fault = filemap_fault,
424 .page_mkwrite = gfs2_page_mkwrite,
425 };
426
427 /**
428 * gfs2_mmap -
429 * @file: The file to map
430 * @vma: The VMA which described the mapping
431 *
432 * There is no need to get a lock here unless we should be updating
433 * atime. We ignore any locking errors since the only consequence is
434 * a missed atime update (which will just be deferred until later).
435 *
436 * Returns: 0
437 */
438
439 static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
440 {
441 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
442
443 if (!(file->f_flags & O_NOATIME)) {
444 struct gfs2_holder i_gh;
445 int error;
446
447 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
448 error = gfs2_glock_nq(&i_gh);
449 file_accessed(file);
450 if (error == 0)
451 gfs2_glock_dq_uninit(&i_gh);
452 }
453 vma->vm_ops = &gfs2_vm_ops;
454 vma->vm_flags |= VM_CAN_NONLINEAR;
455
456 return 0;
457 }
458
459 /**
460 * gfs2_open - open a file
461 * @inode: the inode to open
462 * @file: the struct file for this opening
463 *
464 * Returns: errno
465 */
466
467 static int gfs2_open(struct inode *inode, struct file *file)
468 {
469 struct gfs2_inode *ip = GFS2_I(inode);
470 struct gfs2_holder i_gh;
471 struct gfs2_file *fp;
472 int error;
473
474 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
475 if (!fp)
476 return -ENOMEM;
477
478 mutex_init(&fp->f_fl_mutex);
479
480 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
481 file->private_data = fp;
482
483 if (S_ISREG(ip->i_inode.i_mode)) {
484 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
485 &i_gh);
486 if (error)
487 goto fail;
488
489 if (!(file->f_flags & O_LARGEFILE) &&
490 ip->i_disksize > MAX_NON_LFS) {
491 error = -EOVERFLOW;
492 goto fail_gunlock;
493 }
494
495 gfs2_glock_dq_uninit(&i_gh);
496 }
497
498 return 0;
499
500 fail_gunlock:
501 gfs2_glock_dq_uninit(&i_gh);
502 fail:
503 file->private_data = NULL;
504 kfree(fp);
505 return error;
506 }
507
508 /**
509 * gfs2_close - called to close a struct file
510 * @inode: the inode the struct file belongs to
511 * @file: the struct file being closed
512 *
513 * Returns: errno
514 */
515
516 static int gfs2_close(struct inode *inode, struct file *file)
517 {
518 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
519 struct gfs2_file *fp;
520
521 fp = file->private_data;
522 file->private_data = NULL;
523
524 if (gfs2_assert_warn(sdp, fp))
525 return -EIO;
526
527 kfree(fp);
528
529 return 0;
530 }
531
532 /**
533 * gfs2_fsync - sync the dirty data for a file (across the cluster)
534 * @file: the file that points to the dentry (we ignore this)
535 * @dentry: the dentry that points to the inode to sync
536 *
537 * The VFS will flush "normal" data for us. We only need to worry
538 * about metadata here. For journaled data, we just do a log flush
539 * as we can't avoid it. Otherwise we can just bale out if datasync
540 * is set. For stuffed inodes we must flush the log in order to
541 * ensure that all data is on disk.
542 *
543 * The call to write_inode_now() is there to write back metadata and
544 * the inode itself. It does also try and write the data, but thats
545 * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite()
546 * for us.
547 *
548 * Returns: errno
549 */
550
551 static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
552 {
553 struct inode *inode = dentry->d_inode;
554 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
555 int ret = 0;
556
557 if (gfs2_is_jdata(GFS2_I(inode))) {
558 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
559 return 0;
560 }
561
562 if (sync_state != 0) {
563 if (!datasync)
564 ret = write_inode_now(inode, 0);
565
566 if (gfs2_is_stuffed(GFS2_I(inode)))
567 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
568 }
569
570 return ret;
571 }
572
573 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
574
575 /**
576 * gfs2_setlease - acquire/release a file lease
577 * @file: the file pointer
578 * @arg: lease type
579 * @fl: file lock
580 *
581 * We don't currently have a way to enforce a lease across the whole
582 * cluster; until we do, disable leases (by just returning -EINVAL),
583 * unless the administrator has requested purely local locking.
584 *
585 * Returns: errno
586 */
587
588 static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
589 {
590 return -EINVAL;
591 }
592
593 /**
594 * gfs2_lock - acquire/release a posix lock on a file
595 * @file: the file pointer
596 * @cmd: either modify or retrieve lock state, possibly wait
597 * @fl: type and range of lock
598 *
599 * Returns: errno
600 */
601
602 static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
603 {
604 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
605 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
606 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
607
608 if (!(fl->fl_flags & FL_POSIX))
609 return -ENOLCK;
610 if (__mandatory_lock(&ip->i_inode))
611 return -ENOLCK;
612
613 if (cmd == F_CANCELLK) {
614 /* Hack: */
615 cmd = F_SETLK;
616 fl->fl_type = F_UNLCK;
617 }
618 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
619 return -EIO;
620 if (IS_GETLK(cmd))
621 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
622 else if (fl->fl_type == F_UNLCK)
623 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
624 else
625 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
626 }
627
628 static int do_flock(struct file *file, int cmd, struct file_lock *fl)
629 {
630 struct gfs2_file *fp = file->private_data;
631 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
632 struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
633 struct gfs2_glock *gl;
634 unsigned int state;
635 int flags;
636 int error = 0;
637
638 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
639 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
640
641 mutex_lock(&fp->f_fl_mutex);
642
643 gl = fl_gh->gh_gl;
644 if (gl) {
645 if (fl_gh->gh_state == state)
646 goto out;
647 flock_lock_file_wait(file,
648 &(struct file_lock){.fl_type = F_UNLCK});
649 gfs2_glock_dq_wait(fl_gh);
650 gfs2_holder_reinit(state, flags, fl_gh);
651 } else {
652 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
653 &gfs2_flock_glops, CREATE, &gl);
654 if (error)
655 goto out;
656 gfs2_holder_init(gl, state, flags, fl_gh);
657 gfs2_glock_put(gl);
658 }
659 error = gfs2_glock_nq(fl_gh);
660 if (error) {
661 gfs2_holder_uninit(fl_gh);
662 if (error == GLR_TRYFAILED)
663 error = -EAGAIN;
664 } else {
665 error = flock_lock_file_wait(file, fl);
666 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
667 }
668
669 out:
670 mutex_unlock(&fp->f_fl_mutex);
671 return error;
672 }
673
674 static void do_unflock(struct file *file, struct file_lock *fl)
675 {
676 struct gfs2_file *fp = file->private_data;
677 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
678
679 mutex_lock(&fp->f_fl_mutex);
680 flock_lock_file_wait(file, fl);
681 if (fl_gh->gh_gl)
682 gfs2_glock_dq_uninit(fl_gh);
683 mutex_unlock(&fp->f_fl_mutex);
684 }
685
686 /**
687 * gfs2_flock - acquire/release a flock lock on a file
688 * @file: the file pointer
689 * @cmd: either modify or retrieve lock state, possibly wait
690 * @fl: type and range of lock
691 *
692 * Returns: errno
693 */
694
695 static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
696 {
697 if (!(fl->fl_flags & FL_FLOCK))
698 return -ENOLCK;
699 if (fl->fl_type & LOCK_MAND)
700 return -EOPNOTSUPP;
701
702 if (fl->fl_type == F_UNLCK) {
703 do_unflock(file, fl);
704 return 0;
705 } else {
706 return do_flock(file, cmd, fl);
707 }
708 }
709
710 const struct file_operations gfs2_file_fops = {
711 .llseek = gfs2_llseek,
712 .read = do_sync_read,
713 .aio_read = generic_file_aio_read,
714 .write = do_sync_write,
715 .aio_write = generic_file_aio_write,
716 .unlocked_ioctl = gfs2_ioctl,
717 .mmap = gfs2_mmap,
718 .open = gfs2_open,
719 .release = gfs2_close,
720 .fsync = gfs2_fsync,
721 .lock = gfs2_lock,
722 .flock = gfs2_flock,
723 .splice_read = generic_file_splice_read,
724 .splice_write = generic_file_splice_write,
725 .setlease = gfs2_setlease,
726 };
727
728 const struct file_operations gfs2_dir_fops = {
729 .readdir = gfs2_readdir,
730 .unlocked_ioctl = gfs2_ioctl,
731 .open = gfs2_open,
732 .release = gfs2_close,
733 .fsync = gfs2_fsync,
734 .lock = gfs2_lock,
735 .flock = gfs2_flock,
736 };
737
738 #endif /* CONFIG_GFS2_FS_LOCKING_DLM */
739
740 const struct file_operations gfs2_file_fops_nolock = {
741 .llseek = gfs2_llseek,
742 .read = do_sync_read,
743 .aio_read = generic_file_aio_read,
744 .write = do_sync_write,
745 .aio_write = generic_file_aio_write,
746 .unlocked_ioctl = gfs2_ioctl,
747 .mmap = gfs2_mmap,
748 .open = gfs2_open,
749 .release = gfs2_close,
750 .fsync = gfs2_fsync,
751 .splice_read = generic_file_splice_read,
752 .splice_write = generic_file_splice_write,
753 .setlease = generic_setlease,
754 };
755
756 const struct file_operations gfs2_dir_fops_nolock = {
757 .readdir = gfs2_readdir,
758 .unlocked_ioctl = gfs2_ioctl,
759 .open = gfs2_open,
760 .release = gfs2_close,
761 .fsync = gfs2_fsync,
762 };
763
Support for the Chinese Samsung S3C2440 based development boards