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Merge remote-tracking branch 'fbdev/master'
[linux-2.6/next.git] / fs / gfs2 / inode.c
blob2af69056a9fd0729683525766a771d0900320445
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2011 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/namei.h>
15 #include <linux/mm.h>
16 #include <linux/xattr.h>
17 #include <linux/posix_acl.h>
18 #include <linux/gfs2_ondisk.h>
19 #include <linux/crc32.h>
20 #include <linux/fiemap.h>
21 #include <linux/security.h>
22 #include <asm/uaccess.h>
23
24 #include "gfs2.h"
25 #include "incore.h"
26 #include "acl.h"
27 #include "bmap.h"
28 #include "dir.h"
29 #include "xattr.h"
30 #include "glock.h"
31 #include "inode.h"
32 #include "meta_io.h"
33 #include "quota.h"
34 #include "rgrp.h"
35 #include "trans.h"
36 #include "util.h"
37 #include "super.h"
38 #include "glops.h"
39
40 struct gfs2_skip_data {
41 u64 no_addr;
42 int skipped;
43 int non_block;
44 };
45
46 static int iget_test(struct inode *inode, void *opaque)
47 {
48 struct gfs2_inode *ip = GFS2_I(inode);
49 struct gfs2_skip_data *data = opaque;
50
51 if (ip->i_no_addr == data->no_addr) {
52 if (data->non_block &&
53 inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
54 data->skipped = 1;
55 return 0;
56 }
57 return 1;
58 }
59 return 0;
60 }
61
62 static int iget_set(struct inode *inode, void *opaque)
63 {
64 struct gfs2_inode *ip = GFS2_I(inode);
65 struct gfs2_skip_data *data = opaque;
66
67 if (data->skipped)
68 return -ENOENT;
69 inode->i_ino = (unsigned long)(data->no_addr);
70 ip->i_no_addr = data->no_addr;
71 return 0;
72 }
73
74 struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block)
75 {
76 unsigned long hash = (unsigned long)no_addr;
77 struct gfs2_skip_data data;
78
79 data.no_addr = no_addr;
80 data.skipped = 0;
81 data.non_block = non_block;
82 return ilookup5(sb, hash, iget_test, &data);
83 }
84
85 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr,
86 int non_block)
87 {
88 struct gfs2_skip_data data;
89 unsigned long hash = (unsigned long)no_addr;
90
91 data.no_addr = no_addr;
92 data.skipped = 0;
93 data.non_block = non_block;
94 return iget5_locked(sb, hash, iget_test, iget_set, &data);
95 }
96
97 /**
98 * gfs2_set_iop - Sets inode operations
99 * @inode: The inode with correct i_mode filled in
100 *
101 * GFS2 lookup code fills in vfs inode contents based on info obtained
102 * from directory entry inside gfs2_inode_lookup().
103 */
104
105 static void gfs2_set_iop(struct inode *inode)
106 {
107 struct gfs2_sbd *sdp = GFS2_SB(inode);
108 umode_t mode = inode->i_mode;
109
110 if (S_ISREG(mode)) {
111 inode->i_op = &gfs2_file_iops;
112 if (gfs2_localflocks(sdp))
113 inode->i_fop = &gfs2_file_fops_nolock;
114 else
115 inode->i_fop = &gfs2_file_fops;
116 } else if (S_ISDIR(mode)) {
117 inode->i_op = &gfs2_dir_iops;
118 if (gfs2_localflocks(sdp))
119 inode->i_fop = &gfs2_dir_fops_nolock;
120 else
121 inode->i_fop = &gfs2_dir_fops;
122 } else if (S_ISLNK(mode)) {
123 inode->i_op = &gfs2_symlink_iops;
124 } else {
125 inode->i_op = &gfs2_file_iops;
126 init_special_inode(inode, inode->i_mode, inode->i_rdev);
127 }
128 }
129
130 /**
131 * gfs2_inode_lookup - Lookup an inode
132 * @sb: The super block
133 * @no_addr: The inode number
134 * @type: The type of the inode
135 * non_block: Can we block on inodes that are being freed?
136 *
137 * Returns: A VFS inode, or an error
138 */
139
140 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
141 u64 no_addr, u64 no_formal_ino, int non_block)
142 {
143 struct inode *inode;
144 struct gfs2_inode *ip;
145 struct gfs2_glock *io_gl = NULL;
146 int error;
147
148 inode = gfs2_iget(sb, no_addr, non_block);
149 ip = GFS2_I(inode);
150
151 if (!inode)
152 return ERR_PTR(-ENOBUFS);
153
154 if (inode->i_state & I_NEW) {
155 struct gfs2_sbd *sdp = GFS2_SB(inode);
156 ip->i_no_formal_ino = no_formal_ino;
157
158 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
159 if (unlikely(error))
160 goto fail;
161 ip->i_gl->gl_object = ip;
162
163 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
164 if (unlikely(error))
165 goto fail_put;
166
167 set_bit(GIF_INVALID, &ip->i_flags);
168 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
169 if (unlikely(error))
170 goto fail_iopen;
171
172 ip->i_iopen_gh.gh_gl->gl_object = ip;
173 gfs2_glock_put(io_gl);
174 io_gl = NULL;
175
176 if (type == DT_UNKNOWN) {
177 /* Inode glock must be locked already */
178 error = gfs2_inode_refresh(GFS2_I(inode));
179 if (error)
180 goto fail_refresh;
181 } else {
182 inode->i_mode = DT2IF(type);
183 }
184
185 gfs2_set_iop(inode);
186 unlock_new_inode(inode);
187 }
188
189 return inode;
190
191 fail_refresh:
192 ip->i_iopen_gh.gh_gl->gl_object = NULL;
193 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
194 fail_iopen:
195 if (io_gl)
196 gfs2_glock_put(io_gl);
197 fail_put:
198 ip->i_gl->gl_object = NULL;
199 gfs2_glock_put(ip->i_gl);
200 fail:
201 iget_failed(inode);
202 return ERR_PTR(error);
203 }
204
205 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
206 u64 *no_formal_ino, unsigned int blktype)
207 {
208 struct super_block *sb = sdp->sd_vfs;
209 struct gfs2_holder i_gh;
210 struct inode *inode = NULL;
211 int error;
212
213 /* Must not read in block until block type is verified */
214 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
215 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
216 if (error)
217 return ERR_PTR(error);
218
219 error = gfs2_check_blk_type(sdp, no_addr, blktype);
220 if (error)
221 goto fail;
222
223 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
224 if (IS_ERR(inode))
225 goto fail;
226
227 /* Two extra checks for NFS only */
228 if (no_formal_ino) {
229 error = -ESTALE;
230 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
231 goto fail_iput;
232
233 error = -EIO;
234 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
235 goto fail_iput;
236
237 error = 0;
238 }
239
240 fail:
241 gfs2_glock_dq_uninit(&i_gh);
242 return error ? ERR_PTR(error) : inode;
243 fail_iput:
244 iput(inode);
245 goto fail;
246 }
247
248
249 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
250 {
251 struct qstr qstr;
252 struct inode *inode;
253 gfs2_str2qstr(&qstr, name);
254 inode = gfs2_lookupi(dip, &qstr, 1);
255 /* gfs2_lookupi has inconsistent callers: vfs
256 * related routines expect NULL for no entry found,
257 * gfs2_lookup_simple callers expect ENOENT
258 * and do not check for NULL.
259 */
260 if (inode == NULL)
261 return ERR_PTR(-ENOENT);
262 else
263 return inode;
264 }
265
266
267 /**
268 * gfs2_lookupi - Look up a filename in a directory and return its inode
269 * @d_gh: An initialized holder for the directory glock
270 * @name: The name of the inode to look for
271 * @is_root: If 1, ignore the caller's permissions
272 * @i_gh: An uninitialized holder for the new inode glock
273 *
274 * This can be called via the VFS filldir function when NFS is doing
275 * a readdirplus and the inode which its intending to stat isn't
276 * already in cache. In this case we must not take the directory glock
277 * again, since the readdir call will have already taken that lock.
278 *
279 * Returns: errno
280 */
281
282 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
283 int is_root)
284 {
285 struct super_block *sb = dir->i_sb;
286 struct gfs2_inode *dip = GFS2_I(dir);
287 struct gfs2_holder d_gh;
288 int error = 0;
289 struct inode *inode = NULL;
290 int unlock = 0;
291
292 if (!name->len || name->len > GFS2_FNAMESIZE)
293 return ERR_PTR(-ENAMETOOLONG);
294
295 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
296 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
297 dir == sb->s_root->d_inode)) {
298 igrab(dir);
299 return dir;
300 }
301
302 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
303 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
304 if (error)
305 return ERR_PTR(error);
306 unlock = 1;
307 }
308
309 if (!is_root) {
310 error = gfs2_permission(dir, MAY_EXEC);
311 if (error)
312 goto out;
313 }
314
315 inode = gfs2_dir_search(dir, name);
316 if (IS_ERR(inode))
317 error = PTR_ERR(inode);
318 out:
319 if (unlock)
320 gfs2_glock_dq_uninit(&d_gh);
321 if (error == -ENOENT)
322 return NULL;
323 return inode ? inode : ERR_PTR(error);
324 }
325
326 /**
327 * create_ok - OK to create a new on-disk inode here?
328 * @dip: Directory in which dinode is to be created
329 * @name: Name of new dinode
330 * @mode:
331 *
332 * Returns: errno
333 */
334
335 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
336 unsigned int mode)
337 {
338 int error;
339
340 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
341 if (error)
342 return error;
343
344 /* Don't create entries in an unlinked directory */
345 if (!dip->i_inode.i_nlink)
346 return -ENOENT;
347
348 error = gfs2_dir_check(&dip->i_inode, name, NULL);
349 switch (error) {
350 case -ENOENT:
351 error = 0;
352 break;
353 case 0:
354 return -EEXIST;
355 default:
356 return error;
357 }
358
359 if (dip->i_entries == (u32)-1)
360 return -EFBIG;
361 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
362 return -EMLINK;
363
364 return 0;
365 }
366
367 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
368 unsigned int *uid, unsigned int *gid)
369 {
370 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
371 (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
372 if (S_ISDIR(*mode))
373 *mode |= S_ISUID;
374 else if (dip->i_inode.i_uid != current_fsuid())
375 *mode &= ~07111;
376 *uid = dip->i_inode.i_uid;
377 } else
378 *uid = current_fsuid();
379
380 if (dip->i_inode.i_mode & S_ISGID) {
381 if (S_ISDIR(*mode))
382 *mode |= S_ISGID;
383 *gid = dip->i_inode.i_gid;
384 } else
385 *gid = current_fsgid();
386 }
387
388 static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
389 {
390 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
391 int error;
392
393 if (gfs2_alloc_get(dip) == NULL)
394 return -ENOMEM;
395
396 dip->i_alloc->al_requested = RES_DINODE;
397 error = gfs2_inplace_reserve(dip);
398 if (error)
399 goto out;
400
401 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
402 if (error)
403 goto out_ipreserv;
404
405 error = gfs2_alloc_di(dip, no_addr, generation);
406
407 gfs2_trans_end(sdp);
408
409 out_ipreserv:
410 gfs2_inplace_release(dip);
411 out:
412 gfs2_alloc_put(dip);
413 return error;
414 }
415
416 static void gfs2_init_dir(struct buffer_head *dibh,
417 const struct gfs2_inode *parent)
418 {
419 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
420 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
421
422 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
423 dent->de_inum = di->di_num; /* already GFS2 endian */
424 dent->de_type = cpu_to_be16(DT_DIR);
425
426 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
427 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
428 gfs2_inum_out(parent, dent);
429 dent->de_type = cpu_to_be16(DT_DIR);
430
431 }
432
433 /**
434 * init_dinode - Fill in a new dinode structure
435 * @dip: The directory this inode is being created in
436 * @gl: The glock covering the new inode
437 * @inum: The inode number
438 * @mode: The file permissions
439 * @uid: The uid of the new inode
440 * @gid: The gid of the new inode
441 * @generation: The generation number of the new inode
442 * @dev: The device number (if a device node)
443 * @symname: The symlink destination (if a symlink)
444 * @size: The inode size (ignored for directories)
445 * @bhp: The buffer head (returned to caller)
446 *
447 */
448
449 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
450 const struct gfs2_inum_host *inum, unsigned int mode,
451 unsigned int uid, unsigned int gid,
452 const u64 *generation, dev_t dev, const char *symname,
453 unsigned size, struct buffer_head **bhp)
454 {
455 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
456 struct gfs2_dinode *di;
457 struct buffer_head *dibh;
458 struct timespec tv = CURRENT_TIME;
459
460 dibh = gfs2_meta_new(gl, inum->no_addr);
461 gfs2_trans_add_bh(gl, dibh, 1);
462 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
463 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
464 di = (struct gfs2_dinode *)dibh->b_data;
465
466 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
467 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
468 di->di_mode = cpu_to_be32(mode);
469 di->di_uid = cpu_to_be32(uid);
470 di->di_gid = cpu_to_be32(gid);
471 di->di_nlink = 0;
472 di->di_size = cpu_to_be64(size);
473 di->di_blocks = cpu_to_be64(1);
474 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec);
475 di->di_major = cpu_to_be32(MAJOR(dev));
476 di->di_minor = cpu_to_be32(MINOR(dev));
477 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
478 di->di_generation = cpu_to_be64(*generation);
479 di->di_flags = 0;
480 di->__pad1 = 0;
481 di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
482 di->di_height = 0;
483 di->__pad2 = 0;
484 di->__pad3 = 0;
485 di->di_depth = 0;
486 di->di_entries = 0;
487 memset(&di->__pad4, 0, sizeof(di->__pad4));
488 di->di_eattr = 0;
489 di->di_atime_nsec = cpu_to_be32(tv.tv_nsec);
490 di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec);
491 di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec);
492 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
493
494 switch(mode & S_IFMT) {
495 case S_IFREG:
496 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
497 gfs2_tune_get(sdp, gt_new_files_jdata))
498 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
499 break;
500 case S_IFDIR:
501 di->di_flags |= cpu_to_be32(dip->i_diskflags &
502 GFS2_DIF_INHERIT_JDATA);
503 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
504 di->di_size = cpu_to_be64(sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode));
505 di->di_entries = cpu_to_be32(2);
506 gfs2_init_dir(dibh, dip);
507 break;
508 case S_IFLNK:
509 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, size);
510 break;
511 }
512
513 set_buffer_uptodate(dibh);
514
515 *bhp = dibh;
516 }
517
518 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
519 unsigned int mode, const struct gfs2_inum_host *inum,
520 const u64 *generation, dev_t dev, const char *symname,
521 unsigned int size, struct buffer_head **bhp)
522 {
523 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
524 unsigned int uid, gid;
525 int error;
526
527 munge_mode_uid_gid(dip, &mode, &uid, &gid);
528 if (!gfs2_alloc_get(dip))
529 return -ENOMEM;
530
531 error = gfs2_quota_lock(dip, uid, gid);
532 if (error)
533 goto out;
534
535 error = gfs2_quota_check(dip, uid, gid);
536 if (error)
537 goto out_quota;
538
539 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
540 if (error)
541 goto out_quota;
542
543 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, symname, size, bhp);
544 gfs2_quota_change(dip, +1, uid, gid);
545 gfs2_trans_end(sdp);
546
547 out_quota:
548 gfs2_quota_unlock(dip);
549 out:
550 gfs2_alloc_put(dip);
551 return error;
552 }
553
554 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
555 struct gfs2_inode *ip)
556 {
557 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
558 struct gfs2_alloc *al;
559 int alloc_required;
560 struct buffer_head *dibh;
561 int error;
562
563 al = gfs2_alloc_get(dip);
564 if (!al)
565 return -ENOMEM;
566
567 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
568 if (error)
569 goto fail;
570
571 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
572 if (alloc_required < 0)
573 goto fail_quota_locks;
574 if (alloc_required) {
575 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
576 if (error)
577 goto fail_quota_locks;
578
579 al->al_requested = sdp->sd_max_dirres;
580
581 error = gfs2_inplace_reserve(dip);
582 if (error)
583 goto fail_quota_locks;
584
585 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
586 al->al_rgd->rd_length +
587 2 * RES_DINODE +
588 RES_STATFS + RES_QUOTA, 0);
589 if (error)
590 goto fail_ipreserv;
591 } else {
592 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
593 if (error)
594 goto fail_quota_locks;
595 }
596
597 error = gfs2_dir_add(&dip->i_inode, name, ip);
598 if (error)
599 goto fail_end_trans;
600
601 error = gfs2_meta_inode_buffer(ip, &dibh);
602 if (error)
603 goto fail_end_trans;
604 inc_nlink(&ip->i_inode);
605 if (S_ISDIR(ip->i_inode.i_mode))
606 inc_nlink(&ip->i_inode);
607 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
608 gfs2_dinode_out(ip, dibh->b_data);
609 brelse(dibh);
610 return 0;
611
612 fail_end_trans:
613 gfs2_trans_end(sdp);
614
615 fail_ipreserv:
616 if (dip->i_alloc->al_rgd)
617 gfs2_inplace_release(dip);
618
619 fail_quota_locks:
620 gfs2_quota_unlock(dip);
621
622 fail:
623 gfs2_alloc_put(dip);
624 return error;
625 }
626
627 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
628 const struct qstr *qstr)
629 {
630 int err;
631 size_t len;
632 void *value;
633 char *name;
634
635 err = security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
636 &name, &value, &len);
637
638 if (err) {
639 if (err == -EOPNOTSUPP)
640 return 0;
641 return err;
642 }
643
644 err = __gfs2_xattr_set(&ip->i_inode, name, value, len, 0,
645 GFS2_EATYPE_SECURITY);
646 kfree(value);
647 kfree(name);
648
649 return err;
650 }
651
652 /**
653 * gfs2_create_inode - Create a new inode
654 * @dir: The parent directory
655 * @dentry: The new dentry
656 * @mode: The permissions on the new inode
657 * @dev: For device nodes, this is the device number
658 * @symname: For symlinks, this is the link destination
659 * @size: The initial size of the inode (ignored for directories)
660 *
661 * Returns: 0 on success, or error code
662 */
663
664 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
665 unsigned int mode, dev_t dev, const char *symname,
666 unsigned int size, int excl)
667 {
668 const struct qstr *name = &dentry->d_name;
669 struct gfs2_holder ghs[2];
670 struct inode *inode = NULL;
671 struct gfs2_inode *dip = GFS2_I(dir);
672 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
673 struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
674 int error;
675 u64 generation;
676 struct buffer_head *bh = NULL;
677
678 if (!name->len || name->len > GFS2_FNAMESIZE)
679 return -ENAMETOOLONG;
680
681 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
682 if (error)
683 goto fail;
684
685 error = create_ok(dip, name, mode);
686 if ((error == -EEXIST) && S_ISREG(mode) && !excl) {
687 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
688 gfs2_glock_dq_uninit(ghs);
689 d_instantiate(dentry, inode);
690 return IS_ERR(inode) ? PTR_ERR(inode) : 0;
691 }
692 if (error)
693 goto fail_gunlock;
694
695 error = alloc_dinode(dip, &inum.no_addr, &generation);
696 if (error)
697 goto fail_gunlock;
698 inum.no_formal_ino = generation;
699
700 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
701 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
702 if (error)
703 goto fail_gunlock;
704
705 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, symname, size, &bh);
706 if (error)
707 goto fail_gunlock2;
708
709 inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr,
710 inum.no_formal_ino, 0);
711 if (IS_ERR(inode))
712 goto fail_gunlock2;
713
714 error = gfs2_inode_refresh(GFS2_I(inode));
715 if (error)
716 goto fail_gunlock2;
717
718 error = gfs2_acl_create(dip, inode);
719 if (error)
720 goto fail_gunlock2;
721
722 error = gfs2_security_init(dip, GFS2_I(inode), name);
723 if (error)
724 goto fail_gunlock2;
725
726 error = link_dinode(dip, name, GFS2_I(inode));
727 if (error)
728 goto fail_gunlock2;
729
730 if (bh)
731 brelse(bh);
732
733 gfs2_trans_end(sdp);
734 if (dip->i_alloc->al_rgd)
735 gfs2_inplace_release(dip);
736 gfs2_quota_unlock(dip);
737 gfs2_alloc_put(dip);
738 mark_inode_dirty(inode);
739 gfs2_glock_dq_uninit_m(2, ghs);
740 d_instantiate(dentry, inode);
741 return 0;
742
743 fail_gunlock2:
744 gfs2_glock_dq_uninit(ghs + 1);
745 fail_gunlock:
746 gfs2_glock_dq_uninit(ghs);
747 if (inode && !IS_ERR(inode)) {
748 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags);
749 iput(inode);
750 }
751 fail:
752 if (bh)
753 brelse(bh);
754 return error;
755 }
756
757 /**
758 * gfs2_create - Create a file
759 * @dir: The directory in which to create the file
760 * @dentry: The dentry of the new file
761 * @mode: The mode of the new file
762 *
763 * Returns: errno
764 */
765
766 static int gfs2_create(struct inode *dir, struct dentry *dentry,
767 int mode, struct nameidata *nd)
768 {
769 int excl = 0;
770 if (nd && (nd->flags & LOOKUP_EXCL))
771 excl = 1;
772 return gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0, excl);
773 }
774
775 /**
776 * gfs2_lookup - Look up a filename in a directory and return its inode
777 * @dir: The directory inode
778 * @dentry: The dentry of the new inode
779 * @nd: passed from Linux VFS, ignored by us
780 *
781 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
782 *
783 * Returns: errno
784 */
785
786 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
787 struct nameidata *nd)
788 {
789 struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0);
790 if (inode && !IS_ERR(inode)) {
791 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
792 struct gfs2_holder gh;
793 int error;
794 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
795 if (error) {
796 iput(inode);
797 return ERR_PTR(error);
798 }
799 gfs2_glock_dq_uninit(&gh);
800 }
801 return d_splice_alias(inode, dentry);
802 }
803
804 /**
805 * gfs2_link - Link to a file
806 * @old_dentry: The inode to link
807 * @dir: Add link to this directory
808 * @dentry: The name of the link
809 *
810 * Link the inode in "old_dentry" into the directory "dir" with the
811 * name in "dentry".
812 *
813 * Returns: errno
814 */
815
816 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
817 struct dentry *dentry)
818 {
819 struct gfs2_inode *dip = GFS2_I(dir);
820 struct gfs2_sbd *sdp = GFS2_SB(dir);
821 struct inode *inode = old_dentry->d_inode;
822 struct gfs2_inode *ip = GFS2_I(inode);
823 struct gfs2_holder ghs[2];
824 struct buffer_head *dibh;
825 int alloc_required;
826 int error;
827
828 if (S_ISDIR(inode->i_mode))
829 return -EPERM;
830
831 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
832 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
833
834 error = gfs2_glock_nq(ghs); /* parent */
835 if (error)
836 goto out_parent;
837
838 error = gfs2_glock_nq(ghs + 1); /* child */
839 if (error)
840 goto out_child;
841
842 error = -ENOENT;
843 if (inode->i_nlink == 0)
844 goto out_gunlock;
845
846 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
847 if (error)
848 goto out_gunlock;
849
850 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
851 switch (error) {
852 case -ENOENT:
853 break;
854 case 0:
855 error = -EEXIST;
856 default:
857 goto out_gunlock;
858 }
859
860 error = -EINVAL;
861 if (!dip->i_inode.i_nlink)
862 goto out_gunlock;
863 error = -EFBIG;
864 if (dip->i_entries == (u32)-1)
865 goto out_gunlock;
866 error = -EPERM;
867 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
868 goto out_gunlock;
869 error = -EINVAL;
870 if (!ip->i_inode.i_nlink)
871 goto out_gunlock;
872 error = -EMLINK;
873 if (ip->i_inode.i_nlink == (u32)-1)
874 goto out_gunlock;
875
876 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
877 if (error < 0)
878 goto out_gunlock;
879 error = 0;
880
881 if (alloc_required) {
882 struct gfs2_alloc *al = gfs2_alloc_get(dip);
883 if (!al) {
884 error = -ENOMEM;
885 goto out_gunlock;
886 }
887
888 error = gfs2_quota_lock_check(dip);
889 if (error)
890 goto out_alloc;
891
892 al->al_requested = sdp->sd_max_dirres;
893
894 error = gfs2_inplace_reserve(dip);
895 if (error)
896 goto out_gunlock_q;
897
898 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
899 gfs2_rg_blocks(al) +
900 2 * RES_DINODE + RES_STATFS +
901 RES_QUOTA, 0);
902 if (error)
903 goto out_ipres;
904 } else {
905 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
906 if (error)
907 goto out_ipres;
908 }
909
910 error = gfs2_meta_inode_buffer(ip, &dibh);
911 if (error)
912 goto out_end_trans;
913
914 error = gfs2_dir_add(dir, &dentry->d_name, ip);
915 if (error)
916 goto out_brelse;
917
918 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
919 inc_nlink(&ip->i_inode);
920 ip->i_inode.i_ctime = CURRENT_TIME;
921 ihold(inode);
922 d_instantiate(dentry, inode);
923 mark_inode_dirty(inode);
924
925 out_brelse:
926 brelse(dibh);
927 out_end_trans:
928 gfs2_trans_end(sdp);
929 out_ipres:
930 if (alloc_required)
931 gfs2_inplace_release(dip);
932 out_gunlock_q:
933 if (alloc_required)
934 gfs2_quota_unlock(dip);
935 out_alloc:
936 if (alloc_required)
937 gfs2_alloc_put(dip);
938 out_gunlock:
939 gfs2_glock_dq(ghs + 1);
940 out_child:
941 gfs2_glock_dq(ghs);
942 out_parent:
943 gfs2_holder_uninit(ghs);
944 gfs2_holder_uninit(ghs + 1);
945 return error;
946 }
947
948 /*
949 * gfs2_unlink_ok - check to see that a inode is still in a directory
950 * @dip: the directory
951 * @name: the name of the file
952 * @ip: the inode
953 *
954 * Assumes that the lock on (at least) @dip is held.
955 *
956 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
957 */
958
959 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
960 const struct gfs2_inode *ip)
961 {
962 int error;
963
964 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
965 return -EPERM;
966
967 if ((dip->i_inode.i_mode & S_ISVTX) &&
968 dip->i_inode.i_uid != current_fsuid() &&
969 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
970 return -EPERM;
971
972 if (IS_APPEND(&dip->i_inode))
973 return -EPERM;
974
975 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
976 if (error)
977 return error;
978
979 error = gfs2_dir_check(&dip->i_inode, name, ip);
980 if (error)
981 return error;
982
983 return 0;
984 }
985
986 /**
987 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
988 * @dip: The parent directory
989 * @name: The name of the entry in the parent directory
990 * @bh: The inode buffer for the inode to be removed
991 * @inode: The inode to be removed
992 *
993 * Called with all the locks and in a transaction. This will only be
994 * called for a directory after it has been checked to ensure it is empty.
995 *
996 * Returns: 0 on success, or an error
997 */
998
999 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1000 const struct dentry *dentry,
1001 struct buffer_head *bh)
1002 {
1003 struct inode *inode = dentry->d_inode;
1004 struct gfs2_inode *ip = GFS2_I(inode);
1005 int error;
1006
1007 error = gfs2_dir_del(dip, dentry);
1008 if (error)
1009 return error;
1010
1011 ip->i_entries = 0;
1012 inode->i_ctime = CURRENT_TIME;
1013 if (S_ISDIR(inode->i_mode))
1014 clear_nlink(inode);
1015 else
1016 drop_nlink(inode);
1017 mark_inode_dirty(inode);
1018 if (inode->i_nlink == 0)
1019 gfs2_unlink_di(inode);
1020 return 0;
1021 }
1022
1023
1024 /**
1025 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1026 * @dir: The inode of the directory containing the inode to unlink
1027 * @dentry: The file itself
1028 *
1029 * This routine uses the type of the inode as a flag to figure out
1030 * whether this is an unlink or an rmdir.
1031 *
1032 * Returns: errno
1033 */
1034
1035 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1036 {
1037 struct gfs2_inode *dip = GFS2_I(dir);
1038 struct gfs2_sbd *sdp = GFS2_SB(dir);
1039 struct inode *inode = dentry->d_inode;
1040 struct gfs2_inode *ip = GFS2_I(inode);
1041 struct buffer_head *bh;
1042 struct gfs2_holder ghs[3];
1043 struct gfs2_rgrpd *rgd;
1044 struct gfs2_holder ri_gh;
1045 int error;
1046
1047 error = gfs2_rindex_hold(sdp, &ri_gh);
1048 if (error)
1049 return error;
1050
1051 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1052 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1053
1054 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
1055 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1056
1057
1058 error = gfs2_glock_nq(ghs); /* parent */
1059 if (error)
1060 goto out_parent;
1061
1062 error = gfs2_glock_nq(ghs + 1); /* child */
1063 if (error)
1064 goto out_child;
1065
1066 error = -ENOENT;
1067 if (inode->i_nlink == 0)
1068 goto out_rgrp;
1069
1070 if (S_ISDIR(inode->i_mode)) {
1071 error = -ENOTEMPTY;
1072 if (ip->i_entries > 2 || inode->i_nlink > 2)
1073 goto out_rgrp;
1074 }
1075
1076 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1077 if (error)
1078 goto out_rgrp;
1079
1080 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1081 if (error)
1082 goto out_gunlock;
1083
1084 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1085 if (error)
1086 goto out_gunlock;
1087
1088 error = gfs2_meta_inode_buffer(ip, &bh);
1089 if (error)
1090 goto out_end_trans;
1091
1092 error = gfs2_unlink_inode(dip, dentry, bh);
1093 brelse(bh);
1094
1095 out_end_trans:
1096 gfs2_trans_end(sdp);
1097 out_gunlock:
1098 gfs2_glock_dq(ghs + 2);
1099 out_rgrp:
1100 gfs2_holder_uninit(ghs + 2);
1101 gfs2_glock_dq(ghs + 1);
1102 out_child:
1103 gfs2_holder_uninit(ghs + 1);
1104 gfs2_glock_dq(ghs);
1105 out_parent:
1106 gfs2_holder_uninit(ghs);
1107 gfs2_glock_dq_uninit(&ri_gh);
1108 return error;
1109 }
1110
1111 /**
1112 * gfs2_symlink - Create a symlink
1113 * @dir: The directory to create the symlink in
1114 * @dentry: The dentry to put the symlink in
1115 * @symname: The thing which the link points to
1116 *
1117 * Returns: errno
1118 */
1119
1120 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1121 const char *symname)
1122 {
1123 struct gfs2_sbd *sdp = GFS2_SB(dir);
1124 unsigned int size;
1125
1126 size = strlen(symname);
1127 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1128 return -ENAMETOOLONG;
1129
1130 return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1131 }
1132
1133 /**
1134 * gfs2_mkdir - Make a directory
1135 * @dir: The parent directory of the new one
1136 * @dentry: The dentry of the new directory
1137 * @mode: The mode of the new directory
1138 *
1139 * Returns: errno
1140 */
1141
1142 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1143 {
1144 return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 0, 0);
1145 }
1146
1147 /**
1148 * gfs2_mknod - Make a special file
1149 * @dir: The directory in which the special file will reside
1150 * @dentry: The dentry of the special file
1151 * @mode: The mode of the special file
1152 * @dev: The device specification of the special file
1153 *
1154 */
1155
1156 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
1157 dev_t dev)
1158 {
1159 return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0, 0);
1160 }
1161
1162 /*
1163 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1164 * @this: move this
1165 * @to: to here
1166 *
1167 * Follow @to back to the root and make sure we don't encounter @this
1168 * Assumes we already hold the rename lock.
1169 *
1170 * Returns: errno
1171 */
1172
1173 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1174 {
1175 struct inode *dir = &to->i_inode;
1176 struct super_block *sb = dir->i_sb;
1177 struct inode *tmp;
1178 int error = 0;
1179
1180 igrab(dir);
1181
1182 for (;;) {
1183 if (dir == &this->i_inode) {
1184 error = -EINVAL;
1185 break;
1186 }
1187 if (dir == sb->s_root->d_inode) {
1188 error = 0;
1189 break;
1190 }
1191
1192 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1193 if (IS_ERR(tmp)) {
1194 error = PTR_ERR(tmp);
1195 break;
1196 }
1197
1198 iput(dir);
1199 dir = tmp;
1200 }
1201
1202 iput(dir);
1203
1204 return error;
1205 }
1206
1207 /**
1208 * gfs2_rename - Rename a file
1209 * @odir: Parent directory of old file name
1210 * @odentry: The old dentry of the file
1211 * @ndir: Parent directory of new file name
1212 * @ndentry: The new dentry of the file
1213 *
1214 * Returns: errno
1215 */
1216
1217 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1218 struct inode *ndir, struct dentry *ndentry)
1219 {
1220 struct gfs2_inode *odip = GFS2_I(odir);
1221 struct gfs2_inode *ndip = GFS2_I(ndir);
1222 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1223 struct gfs2_inode *nip = NULL;
1224 struct gfs2_sbd *sdp = GFS2_SB(odir);
1225 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }, ri_gh;
1226 struct gfs2_rgrpd *nrgd;
1227 unsigned int num_gh;
1228 int dir_rename = 0;
1229 int alloc_required = 0;
1230 unsigned int x;
1231 int error;
1232
1233 if (ndentry->d_inode) {
1234 nip = GFS2_I(ndentry->d_inode);
1235 if (ip == nip)
1236 return 0;
1237 }
1238
1239 error = gfs2_rindex_hold(sdp, &ri_gh);
1240 if (error)
1241 return error;
1242
1243 if (odip != ndip) {
1244 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1245 0, &r_gh);
1246 if (error)
1247 goto out;
1248
1249 if (S_ISDIR(ip->i_inode.i_mode)) {
1250 dir_rename = 1;
1251 /* don't move a dirctory into it's subdir */
1252 error = gfs2_ok_to_move(ip, ndip);
1253 if (error)
1254 goto out_gunlock_r;
1255 }
1256 }
1257
1258 num_gh = 1;
1259 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1260 if (odip != ndip) {
1261 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1262 num_gh++;
1263 }
1264 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1265 num_gh++;
1266
1267 if (nip) {
1268 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1269 num_gh++;
1270 /* grab the resource lock for unlink flag twiddling
1271 * this is the case of the target file already existing
1272 * so we unlink before doing the rename
1273 */
1274 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
1275 if (nrgd)
1276 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1277 }
1278
1279 for (x = 0; x < num_gh; x++) {
1280 error = gfs2_glock_nq(ghs + x);
1281 if (error)
1282 goto out_gunlock;
1283 }
1284
1285 error = -ENOENT;
1286 if (ip->i_inode.i_nlink == 0)
1287 goto out_gunlock;
1288
1289 /* Check out the old directory */
1290
1291 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1292 if (error)
1293 goto out_gunlock;
1294
1295 /* Check out the new directory */
1296
1297 if (nip) {
1298 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1299 if (error)
1300 goto out_gunlock;
1301
1302 if (nip->i_inode.i_nlink == 0) {
1303 error = -EAGAIN;
1304 goto out_gunlock;
1305 }
1306
1307 if (S_ISDIR(nip->i_inode.i_mode)) {
1308 if (nip->i_entries < 2) {
1309 gfs2_consist_inode(nip);
1310 error = -EIO;
1311 goto out_gunlock;
1312 }
1313 if (nip->i_entries > 2) {
1314 error = -ENOTEMPTY;
1315 goto out_gunlock;
1316 }
1317 }
1318 } else {
1319 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1320 if (error)
1321 goto out_gunlock;
1322
1323 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1324 switch (error) {
1325 case -ENOENT:
1326 error = 0;
1327 break;
1328 case 0:
1329 error = -EEXIST;
1330 default:
1331 goto out_gunlock;
1332 };
1333
1334 if (odip != ndip) {
1335 if (!ndip->i_inode.i_nlink) {
1336 error = -ENOENT;
1337 goto out_gunlock;
1338 }
1339 if (ndip->i_entries == (u32)-1) {
1340 error = -EFBIG;
1341 goto out_gunlock;
1342 }
1343 if (S_ISDIR(ip->i_inode.i_mode) &&
1344 ndip->i_inode.i_nlink == (u32)-1) {
1345 error = -EMLINK;
1346 goto out_gunlock;
1347 }
1348 }
1349 }
1350
1351 /* Check out the dir to be renamed */
1352
1353 if (dir_rename) {
1354 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1355 if (error)
1356 goto out_gunlock;
1357 }
1358
1359 if (nip == NULL)
1360 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1361 error = alloc_required;
1362 if (error < 0)
1363 goto out_gunlock;
1364 error = 0;
1365
1366 if (alloc_required) {
1367 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
1368 if (!al) {
1369 error = -ENOMEM;
1370 goto out_gunlock;
1371 }
1372
1373 error = gfs2_quota_lock_check(ndip);
1374 if (error)
1375 goto out_alloc;
1376
1377 al->al_requested = sdp->sd_max_dirres;
1378
1379 error = gfs2_inplace_reserve_ri(ndip);
1380 if (error)
1381 goto out_gunlock_q;
1382
1383 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1384 gfs2_rg_blocks(al) +
1385 4 * RES_DINODE + 4 * RES_LEAF +
1386 RES_STATFS + RES_QUOTA + 4, 0);
1387 if (error)
1388 goto out_ipreserv;
1389 } else {
1390 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1391 5 * RES_LEAF + 4, 0);
1392 if (error)
1393 goto out_gunlock;
1394 }
1395
1396 /* Remove the target file, if it exists */
1397
1398 if (nip) {
1399 struct buffer_head *bh;
1400 error = gfs2_meta_inode_buffer(nip, &bh);
1401 if (error)
1402 goto out_end_trans;
1403 error = gfs2_unlink_inode(ndip, ndentry, bh);
1404 brelse(bh);
1405 }
1406
1407 if (dir_rename) {
1408 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1409 if (error)
1410 goto out_end_trans;
1411 } else {
1412 struct buffer_head *dibh;
1413 error = gfs2_meta_inode_buffer(ip, &dibh);
1414 if (error)
1415 goto out_end_trans;
1416 ip->i_inode.i_ctime = CURRENT_TIME;
1417 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1418 gfs2_dinode_out(ip, dibh->b_data);
1419 brelse(dibh);
1420 }
1421
1422 error = gfs2_dir_del(odip, odentry);
1423 if (error)
1424 goto out_end_trans;
1425
1426 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1427 if (error)
1428 goto out_end_trans;
1429
1430 out_end_trans:
1431 gfs2_trans_end(sdp);
1432 out_ipreserv:
1433 if (alloc_required)
1434 gfs2_inplace_release(ndip);
1435 out_gunlock_q:
1436 if (alloc_required)
1437 gfs2_quota_unlock(ndip);
1438 out_alloc:
1439 if (alloc_required)
1440 gfs2_alloc_put(ndip);
1441 out_gunlock:
1442 while (x--) {
1443 gfs2_glock_dq(ghs + x);
1444 gfs2_holder_uninit(ghs + x);
1445 }
1446 out_gunlock_r:
1447 if (r_gh.gh_gl)
1448 gfs2_glock_dq_uninit(&r_gh);
1449 out:
1450 gfs2_glock_dq_uninit(&ri_gh);
1451 return error;
1452 }
1453
1454 /**
1455 * gfs2_follow_link - Follow a symbolic link
1456 * @dentry: The dentry of the link
1457 * @nd: Data that we pass to vfs_follow_link()
1458 *
1459 * This can handle symlinks of any size.
1460 *
1461 * Returns: 0 on success or error code
1462 */
1463
1464 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1465 {
1466 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1467 struct gfs2_holder i_gh;
1468 struct buffer_head *dibh;
1469 unsigned int size;
1470 char *buf;
1471 int error;
1472
1473 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1474 error = gfs2_glock_nq(&i_gh);
1475 if (error) {
1476 gfs2_holder_uninit(&i_gh);
1477 nd_set_link(nd, ERR_PTR(error));
1478 return NULL;
1479 }
1480
1481 size = (unsigned int)i_size_read(&ip->i_inode);
1482 if (size == 0) {
1483 gfs2_consist_inode(ip);
1484 buf = ERR_PTR(-EIO);
1485 goto out;
1486 }
1487
1488 error = gfs2_meta_inode_buffer(ip, &dibh);
1489 if (error) {
1490 buf = ERR_PTR(error);
1491 goto out;
1492 }
1493
1494 buf = kzalloc(size + 1, GFP_NOFS);
1495 if (!buf)
1496 buf = ERR_PTR(-ENOMEM);
1497 else
1498 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1499 brelse(dibh);
1500 out:
1501 gfs2_glock_dq_uninit(&i_gh);
1502 nd_set_link(nd, buf);
1503 return NULL;
1504 }
1505
1506 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1507 {
1508 char *s = nd_get_link(nd);
1509 if (!IS_ERR(s))
1510 kfree(s);
1511 }
1512
1513 /**
1514 * gfs2_permission -
1515 * @inode: The inode
1516 * @mask: The mask to be tested
1517 * @flags: Indicates whether this is an RCU path walk or not
1518 *
1519 * This may be called from the VFS directly, or from within GFS2 with the
1520 * inode locked, so we look to see if the glock is already locked and only
1521 * lock the glock if its not already been done.
1522 *
1523 * Returns: errno
1524 */
1525
1526 int gfs2_permission(struct inode *inode, int mask)
1527 {
1528 struct gfs2_inode *ip;
1529 struct gfs2_holder i_gh;
1530 int error;
1531 int unlock = 0;
1532
1533
1534 ip = GFS2_I(inode);
1535 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1536 if (mask & MAY_NOT_BLOCK)
1537 return -ECHILD;
1538 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1539 if (error)
1540 return error;
1541 unlock = 1;
1542 }
1543
1544 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1545 error = -EACCES;
1546 else
1547 error = generic_permission(inode, mask);
1548 if (unlock)
1549 gfs2_glock_dq_uninit(&i_gh);
1550
1551 return error;
1552 }
1553
1554 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1555 {
1556 setattr_copy(inode, attr);
1557 mark_inode_dirty(inode);
1558 return 0;
1559 }
1560
1561 /**
1562 * gfs2_setattr_simple -
1563 * @ip:
1564 * @attr:
1565 *
1566 * Returns: errno
1567 */
1568
1569 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1570 {
1571 int error;
1572
1573 if (current->journal_info)
1574 return __gfs2_setattr_simple(inode, attr);
1575
1576 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1577 if (error)
1578 return error;
1579
1580 error = __gfs2_setattr_simple(inode, attr);
1581 gfs2_trans_end(GFS2_SB(inode));
1582 return error;
1583 }
1584
1585 static int setattr_chown(struct inode *inode, struct iattr *attr)
1586 {
1587 struct gfs2_inode *ip = GFS2_I(inode);
1588 struct gfs2_sbd *sdp = GFS2_SB(inode);
1589 u32 ouid, ogid, nuid, ngid;
1590 int error;
1591
1592 ouid = inode->i_uid;
1593 ogid = inode->i_gid;
1594 nuid = attr->ia_uid;
1595 ngid = attr->ia_gid;
1596
1597 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1598 ouid = nuid = NO_QUOTA_CHANGE;
1599 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1600 ogid = ngid = NO_QUOTA_CHANGE;
1601
1602 if (!gfs2_alloc_get(ip))
1603 return -ENOMEM;
1604
1605 error = gfs2_quota_lock(ip, nuid, ngid);
1606 if (error)
1607 goto out_alloc;
1608
1609 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1610 error = gfs2_quota_check(ip, nuid, ngid);
1611 if (error)
1612 goto out_gunlock_q;
1613 }
1614
1615 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1616 if (error)
1617 goto out_gunlock_q;
1618
1619 error = gfs2_setattr_simple(inode, attr);
1620 if (error)
1621 goto out_end_trans;
1622
1623 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1624 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1625 gfs2_quota_change(ip, -blocks, ouid, ogid);
1626 gfs2_quota_change(ip, blocks, nuid, ngid);
1627 }
1628
1629 out_end_trans:
1630 gfs2_trans_end(sdp);
1631 out_gunlock_q:
1632 gfs2_quota_unlock(ip);
1633 out_alloc:
1634 gfs2_alloc_put(ip);
1635 return error;
1636 }
1637
1638 /**
1639 * gfs2_setattr - Change attributes on an inode
1640 * @dentry: The dentry which is changing
1641 * @attr: The structure describing the change
1642 *
1643 * The VFS layer wants to change one or more of an inodes attributes. Write
1644 * that change out to disk.
1645 *
1646 * Returns: errno
1647 */
1648
1649 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1650 {
1651 struct inode *inode = dentry->d_inode;
1652 struct gfs2_inode *ip = GFS2_I(inode);
1653 struct gfs2_holder i_gh;
1654 int error;
1655
1656 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1657 if (error)
1658 return error;
1659
1660 error = -EPERM;
1661 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1662 goto out;
1663
1664 error = inode_change_ok(inode, attr);
1665 if (error)
1666 goto out;
1667
1668 if (attr->ia_valid & ATTR_SIZE)
1669 error = gfs2_setattr_size(inode, attr->ia_size);
1670 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1671 error = setattr_chown(inode, attr);
1672 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1673 error = gfs2_acl_chmod(ip, attr);
1674 else
1675 error = gfs2_setattr_simple(inode, attr);
1676
1677 out:
1678 if (!error)
1679 mark_inode_dirty(inode);
1680 gfs2_glock_dq_uninit(&i_gh);
1681 return error;
1682 }
1683
1684 /**
1685 * gfs2_getattr - Read out an inode's attributes
1686 * @mnt: The vfsmount the inode is being accessed from
1687 * @dentry: The dentry to stat
1688 * @stat: The inode's stats
1689 *
1690 * This may be called from the VFS directly, or from within GFS2 with the
1691 * inode locked, so we look to see if the glock is already locked and only
1692 * lock the glock if its not already been done. Note that its the NFS
1693 * readdirplus operation which causes this to be called (from filldir)
1694 * with the glock already held.
1695 *
1696 * Returns: errno
1697 */
1698
1699 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1700 struct kstat *stat)
1701 {
1702 struct inode *inode = dentry->d_inode;
1703 struct gfs2_inode *ip = GFS2_I(inode);
1704 struct gfs2_holder gh;
1705 int error;
1706 int unlock = 0;
1707
1708 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1709 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1710 if (error)
1711 return error;
1712 unlock = 1;
1713 }
1714
1715 generic_fillattr(inode, stat);
1716 if (unlock)
1717 gfs2_glock_dq_uninit(&gh);
1718
1719 return 0;
1720 }
1721
1722 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1723 const void *data, size_t size, int flags)
1724 {
1725 struct inode *inode = dentry->d_inode;
1726 struct gfs2_inode *ip = GFS2_I(inode);
1727 struct gfs2_holder gh;
1728 int ret;
1729
1730 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1731 ret = gfs2_glock_nq(&gh);
1732 if (ret == 0) {
1733 ret = generic_setxattr(dentry, name, data, size, flags);
1734 gfs2_glock_dq(&gh);
1735 }
1736 gfs2_holder_uninit(&gh);
1737 return ret;
1738 }
1739
1740 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1741 void *data, size_t size)
1742 {
1743 struct inode *inode = dentry->d_inode;
1744 struct gfs2_inode *ip = GFS2_I(inode);
1745 struct gfs2_holder gh;
1746 int ret;
1747
1748 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1749 ret = gfs2_glock_nq(&gh);
1750 if (ret == 0) {
1751 ret = generic_getxattr(dentry, name, data, size);
1752 gfs2_glock_dq(&gh);
1753 }
1754 gfs2_holder_uninit(&gh);
1755 return ret;
1756 }
1757
1758 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1759 {
1760 struct inode *inode = dentry->d_inode;
1761 struct gfs2_inode *ip = GFS2_I(inode);
1762 struct gfs2_holder gh;
1763 int ret;
1764
1765 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1766 ret = gfs2_glock_nq(&gh);
1767 if (ret == 0) {
1768 ret = generic_removexattr(dentry, name);
1769 gfs2_glock_dq(&gh);
1770 }
1771 gfs2_holder_uninit(&gh);
1772 return ret;
1773 }
1774
1775 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1776 u64 start, u64 len)
1777 {
1778 struct gfs2_inode *ip = GFS2_I(inode);
1779 struct gfs2_holder gh;
1780 int ret;
1781
1782 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1783 if (ret)
1784 return ret;
1785
1786 mutex_lock(&inode->i_mutex);
1787
1788 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1789 if (ret)
1790 goto out;
1791
1792 if (gfs2_is_stuffed(ip)) {
1793 u64 phys = ip->i_no_addr << inode->i_blkbits;
1794 u64 size = i_size_read(inode);
1795 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1796 FIEMAP_EXTENT_DATA_INLINE;
1797 phys += sizeof(struct gfs2_dinode);
1798 phys += start;
1799 if (start + len > size)
1800 len = size - start;
1801 if (start < size)
1802 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1803 len, flags);
1804 if (ret == 1)
1805 ret = 0;
1806 } else {
1807 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1808 gfs2_block_map);
1809 }
1810
1811 gfs2_glock_dq_uninit(&gh);
1812 out:
1813 mutex_unlock(&inode->i_mutex);
1814 return ret;
1815 }
1816
1817 const struct inode_operations gfs2_file_iops = {
1818 .permission = gfs2_permission,
1819 .setattr = gfs2_setattr,
1820 .getattr = gfs2_getattr,
1821 .setxattr = gfs2_setxattr,
1822 .getxattr = gfs2_getxattr,
1823 .listxattr = gfs2_listxattr,
1824 .removexattr = gfs2_removexattr,
1825 .fiemap = gfs2_fiemap,
1826 .get_acl = gfs2_get_acl,
1827 };
1828
1829 const struct inode_operations gfs2_dir_iops = {
1830 .create = gfs2_create,
1831 .lookup = gfs2_lookup,
1832 .link = gfs2_link,
1833 .unlink = gfs2_unlink,
1834 .symlink = gfs2_symlink,
1835 .mkdir = gfs2_mkdir,
1836 .rmdir = gfs2_unlink,
1837 .mknod = gfs2_mknod,
1838 .rename = gfs2_rename,
1839 .permission = gfs2_permission,
1840 .setattr = gfs2_setattr,
1841 .getattr = gfs2_getattr,
1842 .setxattr = gfs2_setxattr,
1843 .getxattr = gfs2_getxattr,
1844 .listxattr = gfs2_listxattr,
1845 .removexattr = gfs2_removexattr,
1846 .fiemap = gfs2_fiemap,
1847 .get_acl = gfs2_get_acl,
1848 };
1849
1850 const struct inode_operations gfs2_symlink_iops = {
1851 .readlink = generic_readlink,
1852 .follow_link = gfs2_follow_link,
1853 .put_link = gfs2_put_link,
1854 .permission = gfs2_permission,
1855 .setattr = gfs2_setattr,
1856 .getattr = gfs2_getattr,
1857 .setxattr = gfs2_setxattr,
1858 .getxattr = gfs2_getxattr,
1859 .listxattr = gfs2_listxattr,
1860 .removexattr = gfs2_removexattr,
1861 .fiemap = gfs2_fiemap,
1862 .get_acl = gfs2_get_acl,
1863 };
1864
linux-next