]>
Commit | Line | Data |
---|---|---|
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/fs.h> | |
19 | #include <linux/gfs2_ondisk.h> | |
20 | #include <linux/ext2_fs.h> | |
21 | #include <linux/crc32.h> | |
22 | #include <linux/lm_interface.h> | |
23 | #include <linux/writeback.h> | |
24 | #include <asm/uaccess.h> | |
25 | ||
26 | #include "gfs2.h" | |
27 | #include "incore.h" | |
28 | #include "bmap.h" | |
29 | #include "dir.h" | |
30 | #include "glock.h" | |
31 | #include "glops.h" | |
32 | #include "inode.h" | |
33 | #include "lm.h" | |
34 | #include "log.h" | |
35 | #include "meta_io.h" | |
36 | #include "ops_file.h" | |
37 | #include "ops_vm.h" | |
38 | #include "quota.h" | |
39 | #include "rgrp.h" | |
40 | #include "trans.h" | |
41 | #include "util.h" | |
42 | #include "eaops.h" | |
43 | ||
44 | /* | |
45 | * Most fields left uninitialised to catch anybody who tries to | |
46 | * use them. f_flags set to prevent file_accessed() from touching | |
47 | * any other part of this. Its use is purely as a flag so that we | |
48 | * know (in readpage()) whether or not do to locking. | |
49 | */ | |
50 | struct file gfs2_internal_file_sentinel = { | |
51 | .f_flags = O_NOATIME|O_RDONLY, | |
52 | }; | |
53 | ||
54 | static int gfs2_read_actor(read_descriptor_t *desc, struct page *page, | |
55 | unsigned long offset, unsigned long size) | |
56 | { | |
57 | char *kaddr; | |
58 | unsigned long count = desc->count; | |
59 | ||
60 | if (size > count) | |
61 | size = count; | |
62 | ||
63 | kaddr = kmap(page); | |
64 | memcpy(desc->arg.data, kaddr + offset, size); | |
65 | kunmap(page); | |
66 | ||
67 | desc->count = count - size; | |
68 | desc->written += size; | |
69 | desc->arg.buf += size; | |
70 | return size; | |
71 | } | |
72 | ||
73 | int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state, | |
74 | char *buf, loff_t *pos, unsigned size) | |
75 | { | |
76 | struct inode *inode = &ip->i_inode; | |
77 | read_descriptor_t desc; | |
78 | desc.written = 0; | |
79 | desc.arg.data = buf; | |
80 | desc.count = size; | |
81 | desc.error = 0; | |
82 | do_generic_mapping_read(inode->i_mapping, ra_state, | |
83 | &gfs2_internal_file_sentinel, pos, &desc, | |
84 | gfs2_read_actor); | |
85 | return desc.written ? desc.written : desc.error; | |
86 | } | |
87 | ||
88 | /** | |
89 | * gfs2_llseek - seek to a location in a file | |
90 | * @file: the file | |
91 | * @offset: the offset | |
92 | * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END) | |
93 | * | |
94 | * SEEK_END requires the glock for the file because it references the | |
95 | * file's size. | |
96 | * | |
97 | * Returns: The new offset, or errno | |
98 | */ | |
99 | ||
100 | static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin) | |
101 | { | |
102 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); | |
103 | struct gfs2_holder i_gh; | |
104 | loff_t error; | |
105 | ||
106 | if (origin == 2) { | |
107 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, | |
108 | &i_gh); | |
109 | if (!error) { | |
110 | error = remote_llseek(file, offset, origin); | |
111 | gfs2_glock_dq_uninit(&i_gh); | |
112 | } | |
113 | } else | |
114 | error = remote_llseek(file, offset, origin); | |
115 | ||
116 | return error; | |
117 | } | |
118 | ||
119 | /** | |
120 | * gfs2_readdir - Read directory entries from a directory | |
121 | * @file: The directory to read from | |
122 | * @dirent: Buffer for dirents | |
123 | * @filldir: Function used to do the copying | |
124 | * | |
125 | * Returns: errno | |
126 | */ | |
127 | ||
128 | static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir) | |
129 | { | |
130 | struct inode *dir = file->f_mapping->host; | |
131 | struct gfs2_inode *dip = GFS2_I(dir); | |
132 | struct gfs2_holder d_gh; | |
133 | u64 offset = file->f_pos; | |
134 | int error; | |
135 | ||
136 | gfs2_holder_init(dip->i_gl, LM_ST_SHARED, GL_ATIME, &d_gh); | |
137 | error = gfs2_glock_nq_atime(&d_gh); | |
138 | if (error) { | |
139 | gfs2_holder_uninit(&d_gh); | |
140 | return error; | |
141 | } | |
142 | ||
143 | error = gfs2_dir_read(dir, &offset, dirent, filldir); | |
144 | ||
145 | gfs2_glock_dq_uninit(&d_gh); | |
146 | ||
147 | file->f_pos = offset; | |
148 | ||
149 | return error; | |
150 | } | |
151 | ||
152 | /** | |
153 | * fsflags_cvt | |
154 | * @table: A table of 32 u32 flags | |
155 | * @val: a 32 bit value to convert | |
156 | * | |
157 | * This function can be used to convert between fsflags values and | |
158 | * GFS2's own flags values. | |
159 | * | |
160 | * Returns: the converted flags | |
161 | */ | |
162 | static u32 fsflags_cvt(const u32 *table, u32 val) | |
163 | { | |
164 | u32 res = 0; | |
165 | while(val) { | |
166 | if (val & 1) | |
167 | res |= *table; | |
168 | table++; | |
169 | val >>= 1; | |
170 | } | |
171 | return res; | |
172 | } | |
173 | ||
174 | static const u32 fsflags_to_gfs2[32] = { | |
175 | [3] = GFS2_DIF_SYNC, | |
176 | [4] = GFS2_DIF_IMMUTABLE, | |
177 | [5] = GFS2_DIF_APPENDONLY, | |
178 | [7] = GFS2_DIF_NOATIME, | |
179 | [12] = GFS2_DIF_EXHASH, | |
180 | [14] = GFS2_DIF_JDATA, | |
181 | [20] = GFS2_DIF_DIRECTIO, | |
182 | }; | |
183 | ||
184 | static const u32 gfs2_to_fsflags[32] = { | |
185 | [gfs2fl_Sync] = FS_SYNC_FL, | |
186 | [gfs2fl_Immutable] = FS_IMMUTABLE_FL, | |
187 | [gfs2fl_AppendOnly] = FS_APPEND_FL, | |
188 | [gfs2fl_NoAtime] = FS_NOATIME_FL, | |
189 | [gfs2fl_ExHash] = FS_INDEX_FL, | |
190 | [gfs2fl_Jdata] = FS_JOURNAL_DATA_FL, | |
191 | [gfs2fl_Directio] = FS_DIRECTIO_FL, | |
192 | [gfs2fl_InheritDirectio] = FS_DIRECTIO_FL, | |
193 | [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL, | |
194 | }; | |
195 | ||
196 | static int gfs2_get_flags(struct file *filp, u32 __user *ptr) | |
197 | { | |
198 | struct inode *inode = filp->f_path.dentry->d_inode; | |
199 | struct gfs2_inode *ip = GFS2_I(inode); | |
200 | struct gfs2_holder gh; | |
201 | int error; | |
202 | u32 fsflags; | |
203 | ||
204 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh); | |
205 | error = gfs2_glock_nq_atime(&gh); | |
206 | if (error) | |
207 | return error; | |
208 | ||
209 | fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_di.di_flags); | |
210 | if (put_user(fsflags, ptr)) | |
211 | error = -EFAULT; | |
212 | ||
213 | gfs2_glock_dq_m(1, &gh); | |
214 | gfs2_holder_uninit(&gh); | |
215 | return error; | |
216 | } | |
217 | ||
218 | void gfs2_set_inode_flags(struct inode *inode) | |
219 | { | |
220 | struct gfs2_inode *ip = GFS2_I(inode); | |
221 | struct gfs2_dinode_host *di = &ip->i_di; | |
222 | unsigned int flags = inode->i_flags; | |
223 | ||
224 | flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
225 | if (di->di_flags & GFS2_DIF_IMMUTABLE) | |
226 | flags |= S_IMMUTABLE; | |
227 | if (di->di_flags & GFS2_DIF_APPENDONLY) | |
228 | flags |= S_APPEND; | |
229 | if (di->di_flags & GFS2_DIF_NOATIME) | |
230 | flags |= S_NOATIME; | |
231 | if (di->di_flags & GFS2_DIF_SYNC) | |
232 | flags |= S_SYNC; | |
233 | inode->i_flags = flags; | |
234 | } | |
235 | ||
236 | /* Flags that can be set by user space */ | |
237 | #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ | |
238 | GFS2_DIF_DIRECTIO| \ | |
239 | GFS2_DIF_IMMUTABLE| \ | |
240 | GFS2_DIF_APPENDONLY| \ | |
241 | GFS2_DIF_NOATIME| \ | |
242 | GFS2_DIF_SYNC| \ | |
243 | GFS2_DIF_SYSTEM| \ | |
244 | GFS2_DIF_INHERIT_DIRECTIO| \ | |
245 | GFS2_DIF_INHERIT_JDATA) | |
246 | ||
247 | /** | |
248 | * gfs2_set_flags - set flags on an inode | |
249 | * @inode: The inode | |
250 | * @flags: The flags to set | |
251 | * @mask: Indicates which flags are valid | |
252 | * | |
253 | */ | |
254 | static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) | |
255 | { | |
256 | struct inode *inode = filp->f_path.dentry->d_inode; | |
257 | struct gfs2_inode *ip = GFS2_I(inode); | |
258 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
259 | struct buffer_head *bh; | |
260 | struct gfs2_holder gh; | |
261 | int error; | |
262 | u32 new_flags, flags; | |
263 | ||
264 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
265 | if (error) | |
266 | return error; | |
267 | ||
268 | flags = ip->i_di.di_flags; | |
269 | new_flags = (flags & ~mask) | (reqflags & mask); | |
270 | if ((new_flags ^ flags) == 0) | |
271 | goto out; | |
272 | ||
273 | if (S_ISDIR(inode->i_mode)) { | |
274 | if ((new_flags ^ flags) & GFS2_DIF_JDATA) | |
275 | new_flags ^= (GFS2_DIF_JDATA|GFS2_DIF_INHERIT_JDATA); | |
276 | if ((new_flags ^ flags) & GFS2_DIF_DIRECTIO) | |
277 | new_flags ^= (GFS2_DIF_DIRECTIO|GFS2_DIF_INHERIT_DIRECTIO); | |
278 | } | |
279 | ||
280 | error = -EINVAL; | |
281 | if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET) | |
282 | goto out; | |
283 | ||
284 | error = -EPERM; | |
285 | if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE)) | |
286 | goto out; | |
287 | if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY)) | |
288 | goto out; | |
289 | if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) && | |
290 | !capable(CAP_LINUX_IMMUTABLE)) | |
291 | goto out; | |
292 | if (!IS_IMMUTABLE(inode)) { | |
293 | error = permission(inode, MAY_WRITE, NULL); | |
294 | if (error) | |
295 | goto out; | |
296 | } | |
297 | ||
298 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
299 | if (error) | |
300 | goto out; | |
301 | error = gfs2_meta_inode_buffer(ip, &bh); | |
302 | if (error) | |
303 | goto out_trans_end; | |
304 | gfs2_trans_add_bh(ip->i_gl, bh, 1); | |
305 | ip->i_di.di_flags = new_flags; | |
306 | gfs2_dinode_out(ip, bh->b_data); | |
307 | brelse(bh); | |
308 | gfs2_set_inode_flags(inode); | |
309 | out_trans_end: | |
310 | gfs2_trans_end(sdp); | |
311 | out: | |
312 | gfs2_glock_dq_uninit(&gh); | |
313 | return error; | |
314 | } | |
315 | ||
316 | static int gfs2_set_flags(struct file *filp, u32 __user *ptr) | |
317 | { | |
318 | u32 fsflags, gfsflags; | |
319 | if (get_user(fsflags, ptr)) | |
320 | return -EFAULT; | |
321 | gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags); | |
322 | return do_gfs2_set_flags(filp, gfsflags, ~0); | |
323 | } | |
324 | ||
325 | static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
326 | { | |
327 | switch(cmd) { | |
328 | case FS_IOC_GETFLAGS: | |
329 | return gfs2_get_flags(filp, (u32 __user *)arg); | |
330 | case FS_IOC_SETFLAGS: | |
331 | return gfs2_set_flags(filp, (u32 __user *)arg); | |
332 | } | |
333 | return -ENOTTY; | |
334 | } | |
335 | ||
336 | ||
337 | /** | |
338 | * gfs2_mmap - | |
339 | * @file: The file to map | |
340 | * @vma: The VMA which described the mapping | |
341 | * | |
342 | * Returns: 0 or error code | |
343 | */ | |
344 | ||
345 | static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) | |
346 | { | |
347 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); | |
348 | struct gfs2_holder i_gh; | |
349 | int error; | |
350 | ||
351 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); | |
352 | error = gfs2_glock_nq_atime(&i_gh); | |
353 | if (error) { | |
354 | gfs2_holder_uninit(&i_gh); | |
355 | return error; | |
356 | } | |
357 | ||
358 | /* This is VM_MAYWRITE instead of VM_WRITE because a call | |
359 | to mprotect() can turn on VM_WRITE later. */ | |
360 | ||
361 | if ((vma->vm_flags & (VM_MAYSHARE | VM_MAYWRITE)) == | |
362 | (VM_MAYSHARE | VM_MAYWRITE)) | |
363 | vma->vm_ops = &gfs2_vm_ops_sharewrite; | |
364 | else | |
365 | vma->vm_ops = &gfs2_vm_ops_private; | |
366 | ||
367 | gfs2_glock_dq_uninit(&i_gh); | |
368 | ||
369 | return error; | |
370 | } | |
371 | ||
372 | /** | |
373 | * gfs2_open - open a file | |
374 | * @inode: the inode to open | |
375 | * @file: the struct file for this opening | |
376 | * | |
377 | * Returns: errno | |
378 | */ | |
379 | ||
380 | static int gfs2_open(struct inode *inode, struct file *file) | |
381 | { | |
382 | struct gfs2_inode *ip = GFS2_I(inode); | |
383 | struct gfs2_holder i_gh; | |
384 | struct gfs2_file *fp; | |
385 | int error; | |
386 | ||
387 | fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL); | |
388 | if (!fp) | |
389 | return -ENOMEM; | |
390 | ||
391 | mutex_init(&fp->f_fl_mutex); | |
392 | ||
393 | gfs2_assert_warn(GFS2_SB(inode), !file->private_data); | |
394 | file->private_data = fp; | |
395 | ||
396 | if (S_ISREG(ip->i_inode.i_mode)) { | |
397 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, | |
398 | &i_gh); | |
399 | if (error) | |
400 | goto fail; | |
401 | ||
402 | if (!(file->f_flags & O_LARGEFILE) && | |
403 | ip->i_di.di_size > MAX_NON_LFS) { | |
404 | error = -EFBIG; | |
405 | goto fail_gunlock; | |
406 | } | |
407 | ||
408 | /* Listen to the Direct I/O flag */ | |
409 | ||
410 | if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO) | |
411 | file->f_flags |= O_DIRECT; | |
412 | ||
413 | gfs2_glock_dq_uninit(&i_gh); | |
414 | } | |
415 | ||
416 | return 0; | |
417 | ||
418 | fail_gunlock: | |
419 | gfs2_glock_dq_uninit(&i_gh); | |
420 | fail: | |
421 | file->private_data = NULL; | |
422 | kfree(fp); | |
423 | return error; | |
424 | } | |
425 | ||
426 | /** | |
427 | * gfs2_close - called to close a struct file | |
428 | * @inode: the inode the struct file belongs to | |
429 | * @file: the struct file being closed | |
430 | * | |
431 | * Returns: errno | |
432 | */ | |
433 | ||
434 | static int gfs2_close(struct inode *inode, struct file *file) | |
435 | { | |
436 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; | |
437 | struct gfs2_file *fp; | |
438 | ||
439 | fp = file->private_data; | |
440 | file->private_data = NULL; | |
441 | ||
442 | if (gfs2_assert_warn(sdp, fp)) | |
443 | return -EIO; | |
444 | ||
445 | kfree(fp); | |
446 | ||
447 | return 0; | |
448 | } | |
449 | ||
450 | /** | |
451 | * gfs2_fsync - sync the dirty data for a file (across the cluster) | |
452 | * @file: the file that points to the dentry (we ignore this) | |
453 | * @dentry: the dentry that points to the inode to sync | |
454 | * | |
455 | * The VFS will flush "normal" data for us. We only need to worry | |
456 | * about metadata here. For journaled data, we just do a log flush | |
457 | * as we can't avoid it. Otherwise we can just bale out if datasync | |
458 | * is set. For stuffed inodes we must flush the log in order to | |
459 | * ensure that all data is on disk. | |
460 | * | |
461 | * The call to write_inode_now() is there to write back metadata and | |
462 | * the inode itself. It does also try and write the data, but thats | |
463 | * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite() | |
464 | * for us. | |
465 | * | |
466 | * Returns: errno | |
467 | */ | |
468 | ||
469 | static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync) | |
470 | { | |
471 | struct inode *inode = dentry->d_inode; | |
472 | int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC); | |
473 | int ret = 0; | |
474 | ||
475 | if (gfs2_is_jdata(GFS2_I(inode))) { | |
476 | gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl); | |
477 | return 0; | |
478 | } | |
479 | ||
480 | if (sync_state != 0) { | |
481 | if (!datasync) | |
482 | ret = write_inode_now(inode, 0); | |
483 | ||
484 | if (gfs2_is_stuffed(GFS2_I(inode))) | |
485 | gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl); | |
486 | } | |
487 | ||
488 | return ret; | |
489 | } | |
490 | ||
491 | /** | |
492 | * gfs2_lock - acquire/release a posix lock on a file | |
493 | * @file: the file pointer | |
494 | * @cmd: either modify or retrieve lock state, possibly wait | |
495 | * @fl: type and range of lock | |
496 | * | |
497 | * Returns: errno | |
498 | */ | |
499 | ||
500 | static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) | |
501 | { | |
502 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); | |
503 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
504 | struct lm_lockname name = | |
505 | { .ln_number = ip->i_num.no_addr, | |
506 | .ln_type = LM_TYPE_PLOCK }; | |
507 | ||
508 | if (!(fl->fl_flags & FL_POSIX)) | |
509 | return -ENOLCK; | |
510 | if ((ip->i_inode.i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) | |
511 | return -ENOLCK; | |
512 | ||
513 | if (sdp->sd_args.ar_localflocks) { | |
514 | if (IS_GETLK(cmd)) { | |
515 | posix_test_lock(file, fl); | |
516 | return 0; | |
517 | } else { | |
518 | return posix_lock_file_wait(file, fl); | |
519 | } | |
520 | } | |
521 | ||
522 | if (cmd == F_CANCELLK) { | |
523 | /* Hack: */ | |
524 | cmd = F_SETLK; | |
525 | fl->fl_type = F_UNLCK; | |
526 | } | |
527 | if (IS_GETLK(cmd)) | |
528 | return gfs2_lm_plock_get(sdp, &name, file, fl); | |
529 | else if (fl->fl_type == F_UNLCK) | |
530 | return gfs2_lm_punlock(sdp, &name, file, fl); | |
531 | else | |
532 | return gfs2_lm_plock(sdp, &name, file, cmd, fl); | |
533 | } | |
534 | ||
535 | static int do_flock(struct file *file, int cmd, struct file_lock *fl) | |
536 | { | |
537 | struct gfs2_file *fp = file->private_data; | |
538 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; | |
539 | struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode); | |
540 | struct gfs2_glock *gl; | |
541 | unsigned int state; | |
542 | int flags; | |
543 | int error = 0; | |
544 | ||
545 | state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; | |
546 | flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE; | |
547 | ||
548 | mutex_lock(&fp->f_fl_mutex); | |
549 | ||
550 | gl = fl_gh->gh_gl; | |
551 | if (gl) { | |
552 | if (fl_gh->gh_state == state) | |
553 | goto out; | |
554 | gfs2_glock_hold(gl); | |
555 | flock_lock_file_wait(file, | |
556 | &(struct file_lock){.fl_type = F_UNLCK}); | |
557 | gfs2_glock_dq_uninit(fl_gh); | |
558 | } else { | |
559 | error = gfs2_glock_get(GFS2_SB(&ip->i_inode), | |
560 | ip->i_num.no_addr, &gfs2_flock_glops, | |
561 | CREATE, &gl); | |
562 | if (error) | |
563 | goto out; | |
564 | } | |
565 | ||
566 | gfs2_holder_init(gl, state, flags, fl_gh); | |
567 | gfs2_glock_put(gl); | |
568 | ||
569 | error = gfs2_glock_nq(fl_gh); | |
570 | if (error) { | |
571 | gfs2_holder_uninit(fl_gh); | |
572 | if (error == GLR_TRYFAILED) | |
573 | error = -EAGAIN; | |
574 | } else { | |
575 | error = flock_lock_file_wait(file, fl); | |
576 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); | |
577 | } | |
578 | ||
579 | out: | |
580 | mutex_unlock(&fp->f_fl_mutex); | |
581 | return error; | |
582 | } | |
583 | ||
584 | static void do_unflock(struct file *file, struct file_lock *fl) | |
585 | { | |
586 | struct gfs2_file *fp = file->private_data; | |
587 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; | |
588 | ||
589 | mutex_lock(&fp->f_fl_mutex); | |
590 | flock_lock_file_wait(file, fl); | |
591 | if (fl_gh->gh_gl) | |
592 | gfs2_glock_dq_uninit(fl_gh); | |
593 | mutex_unlock(&fp->f_fl_mutex); | |
594 | } | |
595 | ||
596 | /** | |
597 | * gfs2_flock - acquire/release a flock lock on a file | |
598 | * @file: the file pointer | |
599 | * @cmd: either modify or retrieve lock state, possibly wait | |
600 | * @fl: type and range of lock | |
601 | * | |
602 | * Returns: errno | |
603 | */ | |
604 | ||
605 | static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) | |
606 | { | |
607 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); | |
608 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); | |
609 | ||
610 | if (!(fl->fl_flags & FL_FLOCK)) | |
611 | return -ENOLCK; | |
612 | if ((ip->i_inode.i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) | |
613 | return -ENOLCK; | |
614 | ||
615 | if (sdp->sd_args.ar_localflocks) | |
616 | return flock_lock_file_wait(file, fl); | |
617 | ||
618 | if (fl->fl_type == F_UNLCK) { | |
619 | do_unflock(file, fl); | |
620 | return 0; | |
621 | } else { | |
622 | return do_flock(file, cmd, fl); | |
623 | } | |
624 | } | |
625 | ||
626 | const struct file_operations gfs2_file_fops = { | |
627 | .llseek = gfs2_llseek, | |
628 | .read = do_sync_read, | |
629 | .aio_read = generic_file_aio_read, | |
630 | .write = do_sync_write, | |
631 | .aio_write = generic_file_aio_write, | |
632 | .unlocked_ioctl = gfs2_ioctl, | |
633 | .mmap = gfs2_mmap, | |
634 | .open = gfs2_open, | |
635 | .release = gfs2_close, | |
636 | .fsync = gfs2_fsync, | |
637 | .lock = gfs2_lock, | |
638 | .sendfile = generic_file_sendfile, | |
639 | .flock = gfs2_flock, | |
640 | .splice_read = generic_file_splice_read, | |
641 | .splice_write = generic_file_splice_write, | |
642 | }; | |
643 | ||
644 | const struct file_operations gfs2_dir_fops = { | |
645 | .readdir = gfs2_readdir, | |
646 | .unlocked_ioctl = gfs2_ioctl, | |
647 | .open = gfs2_open, | |
648 | .release = gfs2_close, | |
649 | .fsync = gfs2_fsync, | |
650 | .lock = gfs2_lock, | |
651 | .flock = gfs2_flock, | |
652 | }; | |
653 |