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[GFS2] Fix code style/indent in ops_file.c
[linux-2.6.git] / fs / gfs2 / ops_file.c
blobfafa48b9105e4aa9594b1c3fec317414932af1c5
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/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/pagemap.h>
16 #include <linux/uio.h>
17 #include <linux/blkdev.h>
18 #include <linux/mm.h>
19 #include <linux/smp_lock.h>
20 #include <linux/fs.h>
21 #include <linux/gfs2_ondisk.h>
22 #include <linux/ext2_fs.h>
23 #include <linux/crc32.h>
24 #include <linux/iflags.h>
25 #include <linux/lm_interface.h>
26 #include <asm/uaccess.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 "lm.h"
36 #include "log.h"
37 #include "meta_io.h"
38 #include "ops_file.h"
39 #include "ops_vm.h"
40 #include "quota.h"
41 #include "rgrp.h"
42 #include "trans.h"
43 #include "util.h"
44 #include "eaops.h"
45
46 /* For regular, non-NFS */
47 struct filldir_reg {
48 struct gfs2_sbd *fdr_sbd;
49 int fdr_prefetch;
50
51 filldir_t fdr_filldir;
52 void *fdr_opaque;
53 };
54
55 /*
56 * Most fields left uninitialised to catch anybody who tries to
57 * use them. f_flags set to prevent file_accessed() from touching
58 * any other part of this. Its use is purely as a flag so that we
59 * know (in readpage()) whether or not do to locking.
60 */
61 struct file gfs2_internal_file_sentinel = {
62 .f_flags = O_NOATIME|O_RDONLY,
63 };
64
65 static int gfs2_read_actor(read_descriptor_t *desc, struct page *page,
66 unsigned long offset, unsigned long size)
67 {
68 char *kaddr;
69 unsigned long count = desc->count;
70
71 if (size > count)
72 size = count;
73
74 kaddr = kmap(page);
75 memcpy(desc->arg.buf, kaddr + offset, size);
76 kunmap(page);
77
78 desc->count = count - size;
79 desc->written += size;
80 desc->arg.buf += size;
81 return size;
82 }
83
84 int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state,
85 char *buf, loff_t *pos, unsigned size)
86 {
87 struct inode *inode = &ip->i_inode;
88 read_descriptor_t desc;
89 desc.written = 0;
90 desc.arg.buf = buf;
91 desc.count = size;
92 desc.error = 0;
93 do_generic_mapping_read(inode->i_mapping, ra_state,
94 &gfs2_internal_file_sentinel, pos, &desc,
95 gfs2_read_actor);
96 return desc.written ? desc.written : desc.error;
97 }
98
99 /**
100 * gfs2_llseek - seek to a location in a file
101 * @file: the file
102 * @offset: the offset
103 * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
104 *
105 * SEEK_END requires the glock for the file because it references the
106 * file's size.
107 *
108 * Returns: The new offset, or errno
109 */
110
111 static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin)
112 {
113 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
114 struct gfs2_holder i_gh;
115 loff_t error;
116
117 if (origin == 2) {
118 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
119 &i_gh);
120 if (!error) {
121 error = remote_llseek(file, offset, origin);
122 gfs2_glock_dq_uninit(&i_gh);
123 }
124 } else
125 error = remote_llseek(file, offset, origin);
126
127 return error;
128 }
129
130 /**
131 * filldir_func - Report a directory entry to the caller of gfs2_dir_read()
132 * @opaque: opaque data used by the function
133 * @name: the name of the directory entry
134 * @length: the length of the name
135 * @offset: the entry's offset in the directory
136 * @inum: the inode number the entry points to
137 * @type: the type of inode the entry points to
138 *
139 * Returns: 0 on success, 1 if buffer full
140 */
141
142 static int filldir_func(void *opaque, const char *name, unsigned int length,
143 u64 offset, struct gfs2_inum *inum,
144 unsigned int type)
145 {
146 struct filldir_reg *fdr = (struct filldir_reg *)opaque;
147 struct gfs2_sbd *sdp = fdr->fdr_sbd;
148 int error;
149
150 error = fdr->fdr_filldir(fdr->fdr_opaque, name, length, offset,
151 inum->no_addr, type);
152 if (error)
153 return 1;
154
155 if (fdr->fdr_prefetch && !(length == 1 && *name == '.')) {
156 gfs2_glock_prefetch_num(sdp, inum->no_addr, &gfs2_inode_glops,
157 LM_ST_SHARED, LM_FLAG_TRY | LM_FLAG_ANY);
158 gfs2_glock_prefetch_num(sdp, inum->no_addr, &gfs2_iopen_glops,
159 LM_ST_SHARED, LM_FLAG_TRY);
160 }
161
162 return 0;
163 }
164
165 /**
166 * gfs2_readdir - Read directory entries from a directory
167 * @file: The directory to read from
168 * @dirent: Buffer for dirents
169 * @filldir: Function used to do the copying
170 *
171 * Returns: errno
172 */
173
174 static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir)
175 {
176 struct inode *dir = file->f_mapping->host;
177 struct gfs2_inode *dip = GFS2_I(dir);
178 struct filldir_reg fdr;
179 struct gfs2_holder d_gh;
180 u64 offset = file->f_pos;
181 int error;
182
183 fdr.fdr_sbd = GFS2_SB(dir);
184 fdr.fdr_prefetch = 1;
185 fdr.fdr_filldir = filldir;
186 fdr.fdr_opaque = dirent;
187
188 gfs2_holder_init(dip->i_gl, LM_ST_SHARED, GL_ATIME, &d_gh);
189 error = gfs2_glock_nq_atime(&d_gh);
190 if (error) {
191 gfs2_holder_uninit(&d_gh);
192 return error;
193 }
194
195 error = gfs2_dir_read(dir, &offset, &fdr, filldir_func);
196
197 gfs2_glock_dq_uninit(&d_gh);
198
199 file->f_pos = offset;
200
201 return error;
202 }
203
204
205 static const u32 iflags_to_gfs2[32] = {
206 [iflag_Sync] = GFS2_DIF_SYNC,
207 [iflag_Immutable] = GFS2_DIF_IMMUTABLE,
208 [iflag_Append] = GFS2_DIF_APPENDONLY,
209 [iflag_NoAtime] = GFS2_DIF_NOATIME,
210 [iflag_Index] = GFS2_DIF_EXHASH,
211 [iflag_JournalData] = GFS2_DIF_JDATA,
212 [iflag_DirectIO] = GFS2_DIF_DIRECTIO,
213 };
214
215 static const u32 gfs2_to_iflags[32] = {
216 [gfs2fl_Sync] = IFLAG_SYNC,
217 [gfs2fl_Immutable] = IFLAG_IMMUTABLE,
218 [gfs2fl_AppendOnly] = IFLAG_APPEND,
219 [gfs2fl_NoAtime] = IFLAG_NOATIME,
220 [gfs2fl_ExHash] = IFLAG_INDEX,
221 [gfs2fl_Jdata] = IFLAG_JOURNAL_DATA,
222 [gfs2fl_Directio] = IFLAG_DIRECTIO,
223 [gfs2fl_InheritDirectio] = IFLAG_DIRECTIO,
224 [gfs2fl_InheritJdata] = IFLAG_JOURNAL_DATA,
225 };
226
227 static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
228 {
229 struct inode *inode = filp->f_dentry->d_inode;
230 struct gfs2_inode *ip = GFS2_I(inode);
231 struct gfs2_holder gh;
232 int error;
233 u32 iflags;
234
235 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh);
236 error = gfs2_glock_nq_m_atime(1, &gh);
237 if (error)
238 return error;
239
240 iflags = iflags_cvt(gfs2_to_iflags, ip->i_di.di_flags);
241 if (put_user(iflags, ptr))
242 error = -EFAULT;
243
244 gfs2_glock_dq_m(1, &gh);
245 gfs2_holder_uninit(&gh);
246 return error;
247 }
248
249 /* Flags that can be set by user space */
250 #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
251 GFS2_DIF_DIRECTIO| \
252 GFS2_DIF_IMMUTABLE| \
253 GFS2_DIF_APPENDONLY| \
254 GFS2_DIF_NOATIME| \
255 GFS2_DIF_SYNC| \
256 GFS2_DIF_SYSTEM| \
257 GFS2_DIF_INHERIT_DIRECTIO| \
258 GFS2_DIF_INHERIT_JDATA)
259
260 /**
261 * gfs2_set_flags - set flags on an inode
262 * @inode: The inode
263 * @flags: The flags to set
264 * @mask: Indicates which flags are valid
265 *
266 */
267 static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
268 {
269 struct inode *inode = filp->f_dentry->d_inode;
270 struct gfs2_inode *ip = GFS2_I(inode);
271 struct gfs2_sbd *sdp = GFS2_SB(inode);
272 struct buffer_head *bh;
273 struct gfs2_holder gh;
274 int error;
275 u32 new_flags, flags;
276
277 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
278 if (error)
279 return error;
280
281 flags = ip->i_di.di_flags;
282 new_flags = (flags & ~mask) | (reqflags & mask);
283 if ((new_flags ^ flags) == 0)
284 goto out;
285
286 if (S_ISDIR(inode->i_mode)) {
287 if ((new_flags ^ flags) & GFS2_DIF_JDATA)
288 new_flags ^= (GFS2_DIF_JDATA|GFS2_DIF_INHERIT_JDATA);
289 if ((new_flags ^ flags) & GFS2_DIF_DIRECTIO)
290 new_flags ^= (GFS2_DIF_DIRECTIO|GFS2_DIF_INHERIT_DIRECTIO);
291 }
292
293 error = -EINVAL;
294 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
295 goto out;
296
297 error = -EPERM;
298 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
299 goto out;
300 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
301 goto out;
302 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
303 !capable(CAP_LINUX_IMMUTABLE))
304 goto out;
305 if (!IS_IMMUTABLE(inode)) {
306 error = permission(inode, MAY_WRITE, NULL);
307 if (error)
308 goto out;
309 }
310
311 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
312 if (error)
313 goto out;
314 error = gfs2_meta_inode_buffer(ip, &bh);
315 if (error)
316 goto out_trans_end;
317 gfs2_trans_add_bh(ip->i_gl, bh, 1);
318 ip->i_di.di_flags = new_flags;
319 gfs2_dinode_out(&ip->i_di, bh->b_data);
320 brelse(bh);
321 out_trans_end:
322 gfs2_trans_end(sdp);
323 out:
324 gfs2_glock_dq_uninit(&gh);
325 return error;
326 }
327
328 static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
329 {
330 u32 iflags, gfsflags;
331 if (get_user(iflags, ptr))
332 return -EFAULT;
333 gfsflags = iflags_cvt(iflags_to_gfs2, iflags);
334 return do_gfs2_set_flags(filp, gfsflags, ~0);
335 }
336
337 static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
338 {
339 switch(cmd) {
340 case IFLAGS_GET_IOC:
341 return gfs2_get_flags(filp, (u32 __user *)arg);
342 case IFLAGS_SET_IOC:
343 return gfs2_set_flags(filp, (u32 __user *)arg);
344 }
345 return -ENOTTY;
346 }
347
348
349 /**
350 * gfs2_mmap -
351 * @file: The file to map
352 * @vma: The VMA which described the mapping
353 *
354 * Returns: 0 or error code
355 */
356
357 static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
358 {
359 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
360 struct gfs2_holder i_gh;
361 int error;
362
363 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
364 error = gfs2_glock_nq_atime(&i_gh);
365 if (error) {
366 gfs2_holder_uninit(&i_gh);
367 return error;
368 }
369
370 /* This is VM_MAYWRITE instead of VM_WRITE because a call
371 to mprotect() can turn on VM_WRITE later. */
372
373 if ((vma->vm_flags & (VM_MAYSHARE | VM_MAYWRITE)) ==
374 (VM_MAYSHARE | VM_MAYWRITE))
375 vma->vm_ops = &gfs2_vm_ops_sharewrite;
376 else
377 vma->vm_ops = &gfs2_vm_ops_private;
378
379 gfs2_glock_dq_uninit(&i_gh);
380
381 return error;
382 }
383
384 /**
385 * gfs2_open - open a file
386 * @inode: the inode to open
387 * @file: the struct file for this opening
388 *
389 * Returns: errno
390 */
391
392 static int gfs2_open(struct inode *inode, struct file *file)
393 {
394 struct gfs2_inode *ip = GFS2_I(inode);
395 struct gfs2_holder i_gh;
396 struct gfs2_file *fp;
397 int error;
398
399 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
400 if (!fp)
401 return -ENOMEM;
402
403 mutex_init(&fp->f_fl_mutex);
404
405 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
406 file->private_data = fp;
407
408 if (S_ISREG(ip->i_di.di_mode)) {
409 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
410 &i_gh);
411 if (error)
412 goto fail;
413
414 if (!(file->f_flags & O_LARGEFILE) &&
415 ip->i_di.di_size > MAX_NON_LFS) {
416 error = -EFBIG;
417 goto fail_gunlock;
418 }
419
420 /* Listen to the Direct I/O flag */
421
422 if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO)
423 file->f_flags |= O_DIRECT;
424
425 gfs2_glock_dq_uninit(&i_gh);
426 }
427
428 return 0;
429
430 fail_gunlock:
431 gfs2_glock_dq_uninit(&i_gh);
432 fail:
433 file->private_data = NULL;
434 kfree(fp);
435 return error;
436 }
437
438 /**
439 * gfs2_close - called to close a struct file
440 * @inode: the inode the struct file belongs to
441 * @file: the struct file being closed
442 *
443 * Returns: errno
444 */
445
446 static int gfs2_close(struct inode *inode, struct file *file)
447 {
448 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
449 struct gfs2_file *fp;
450
451 fp = file->private_data;
452 file->private_data = NULL;
453
454 if (gfs2_assert_warn(sdp, fp))
455 return -EIO;
456
457 kfree(fp);
458
459 return 0;
460 }
461
462 /**
463 * gfs2_fsync - sync the dirty data for a file (across the cluster)
464 * @file: the file that points to the dentry (we ignore this)
465 * @dentry: the dentry that points to the inode to sync
466 *
467 * Returns: errno
468 */
469
470 static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
471 {
472 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
473
474 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
475
476 return 0;
477 }
478
479 /**
480 * gfs2_lock - acquire/release a posix lock on a file
481 * @file: the file pointer
482 * @cmd: either modify or retrieve lock state, possibly wait
483 * @fl: type and range of lock
484 *
485 * Returns: errno
486 */
487
488 static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
489 {
490 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
491 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
492 struct lm_lockname name =
493 { .ln_number = ip->i_num.no_addr,
494 .ln_type = LM_TYPE_PLOCK };
495
496 if (!(fl->fl_flags & FL_POSIX))
497 return -ENOLCK;
498 if ((ip->i_di.di_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
499 return -ENOLCK;
500
501 if (sdp->sd_args.ar_localflocks) {
502 if (IS_GETLK(cmd)) {
503 struct file_lock tmp;
504 int ret;
505 ret = posix_test_lock(file, fl, &tmp);
506 fl->fl_type = F_UNLCK;
507 if (ret)
508 memcpy(fl, &tmp, sizeof(struct file_lock));
509 return 0;
510 } else {
511 return posix_lock_file_wait(file, fl);
512 }
513 }
514
515 if (IS_GETLK(cmd))
516 return gfs2_lm_plock_get(sdp, &name, file, fl);
517 else if (fl->fl_type == F_UNLCK)
518 return gfs2_lm_punlock(sdp, &name, file, fl);
519 else
520 return gfs2_lm_plock(sdp, &name, file, cmd, fl);
521 }
522
523 static int do_flock(struct file *file, int cmd, struct file_lock *fl)
524 {
525 struct gfs2_file *fp = file->private_data;
526 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
527 struct gfs2_inode *ip = GFS2_I(file->f_dentry->d_inode);
528 struct gfs2_glock *gl;
529 unsigned int state;
530 int flags;
531 int error = 0;
532
533 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
534 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
535
536 mutex_lock(&fp->f_fl_mutex);
537
538 gl = fl_gh->gh_gl;
539 if (gl) {
540 if (fl_gh->gh_state == state)
541 goto out;
542 gfs2_glock_hold(gl);
543 flock_lock_file_wait(file,
544 &(struct file_lock){.fl_type = F_UNLCK});
545 gfs2_glock_dq_uninit(fl_gh);
546 } else {
547 error = gfs2_glock_get(GFS2_SB(&ip->i_inode),
548 ip->i_num.no_addr, &gfs2_flock_glops,
549 CREATE, &gl);
550 if (error)
551 goto out;
552 }
553
554 gfs2_holder_init(gl, state, flags, fl_gh);
555 gfs2_glock_put(gl);
556
557 error = gfs2_glock_nq(fl_gh);
558 if (error) {
559 gfs2_holder_uninit(fl_gh);
560 if (error == GLR_TRYFAILED)
561 error = -EAGAIN;
562 } else {
563 error = flock_lock_file_wait(file, fl);
564 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
565 }
566
567 out:
568 mutex_unlock(&fp->f_fl_mutex);
569 return error;
570 }
571
572 static void do_unflock(struct file *file, struct file_lock *fl)
573 {
574 struct gfs2_file *fp = file->private_data;
575 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
576
577 mutex_lock(&fp->f_fl_mutex);
578 flock_lock_file_wait(file, fl);
579 if (fl_gh->gh_gl)
580 gfs2_glock_dq_uninit(fl_gh);
581 mutex_unlock(&fp->f_fl_mutex);
582 }
583
584 /**
585 * gfs2_flock - acquire/release a flock lock on a file
586 * @file: the file pointer
587 * @cmd: either modify or retrieve lock state, possibly wait
588 * @fl: type and range of lock
589 *
590 * Returns: errno
591 */
592
593 static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
594 {
595 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
596 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
597
598 if (!(fl->fl_flags & FL_FLOCK))
599 return -ENOLCK;
600 if ((ip->i_di.di_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
601 return -ENOLCK;
602
603 if (sdp->sd_args.ar_localflocks)
604 return flock_lock_file_wait(file, fl);
605
606 if (fl->fl_type == F_UNLCK) {
607 do_unflock(file, fl);
608 return 0;
609 } else {
610 return do_flock(file, cmd, fl);
611 }
612 }
613
614 const struct file_operations gfs2_file_fops = {
615 .llseek = gfs2_llseek,
616 .read = do_sync_read,
617 .aio_read = generic_file_aio_read,
618 .write = do_sync_write,
619 .aio_write = generic_file_aio_write,
620 .unlocked_ioctl = gfs2_ioctl,
621 .mmap = gfs2_mmap,
622 .open = gfs2_open,
623 .release = gfs2_close,
624 .fsync = gfs2_fsync,
625 .lock = gfs2_lock,
626 .sendfile = generic_file_sendfile,
627 .flock = gfs2_flock,
628 .splice_read = generic_file_splice_read,
629 .splice_write = generic_file_splice_write,
630 };
631
632 const struct file_operations gfs2_dir_fops = {
633 .readdir = gfs2_readdir,
634 .unlocked_ioctl = gfs2_ioctl,
635 .open = gfs2_open,
636 .release = gfs2_close,
637 .fsync = gfs2_fsync,
638 .lock = gfs2_lock,
639 .flock = gfs2_flock,
640 };
641
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