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Add linux-next specific files for 20110831
[linux-2.6/next.git] / fs / gfs2 / inode.c
blob5431de94085dc89152521e96e3c2b9dd18be59b7
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 int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
628 void *fs_info)
629 {
630 const struct xattr *xattr;
631 int err = 0;
632
633 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
634 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
635 xattr->value_len, 0,
636 GFS2_EATYPE_SECURITY);
637 if (err < 0)
638 break;
639 }
640 return err;
641 }
642
643 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
644 const struct qstr *qstr)
645 {
646 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
647 &gfs2_initxattrs, NULL);
648 }
649
650 /**
651 * gfs2_create_inode - Create a new inode
652 * @dir: The parent directory
653 * @dentry: The new dentry
654 * @mode: The permissions on the new inode
655 * @dev: For device nodes, this is the device number
656 * @symname: For symlinks, this is the link destination
657 * @size: The initial size of the inode (ignored for directories)
658 *
659 * Returns: 0 on success, or error code
660 */
661
662 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
663 unsigned int mode, dev_t dev, const char *symname,
664 unsigned int size, int excl)
665 {
666 const struct qstr *name = &dentry->d_name;
667 struct gfs2_holder ghs[2];
668 struct inode *inode = NULL;
669 struct gfs2_inode *dip = GFS2_I(dir);
670 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
671 struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
672 int error;
673 u64 generation;
674 struct buffer_head *bh = NULL;
675
676 if (!name->len || name->len > GFS2_FNAMESIZE)
677 return -ENAMETOOLONG;
678
679 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
680 if (error)
681 goto fail;
682
683 error = create_ok(dip, name, mode);
684 if ((error == -EEXIST) && S_ISREG(mode) && !excl) {
685 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
686 gfs2_glock_dq_uninit(ghs);
687 d_instantiate(dentry, inode);
688 return IS_ERR(inode) ? PTR_ERR(inode) : 0;
689 }
690 if (error)
691 goto fail_gunlock;
692
693 error = alloc_dinode(dip, &inum.no_addr, &generation);
694 if (error)
695 goto fail_gunlock;
696 inum.no_formal_ino = generation;
697
698 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
699 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
700 if (error)
701 goto fail_gunlock;
702
703 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, symname, size, &bh);
704 if (error)
705 goto fail_gunlock2;
706
707 inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr,
708 inum.no_formal_ino, 0);
709 if (IS_ERR(inode))
710 goto fail_gunlock2;
711
712 error = gfs2_inode_refresh(GFS2_I(inode));
713 if (error)
714 goto fail_gunlock2;
715
716 error = gfs2_acl_create(dip, inode);
717 if (error)
718 goto fail_gunlock2;
719
720 error = gfs2_security_init(dip, GFS2_I(inode), name);
721 if (error)
722 goto fail_gunlock2;
723
724 error = link_dinode(dip, name, GFS2_I(inode));
725 if (error)
726 goto fail_gunlock2;
727
728 if (bh)
729 brelse(bh);
730
731 gfs2_trans_end(sdp);
732 if (dip->i_alloc->al_rgd)
733 gfs2_inplace_release(dip);
734 gfs2_quota_unlock(dip);
735 gfs2_alloc_put(dip);
736 mark_inode_dirty(inode);
737 gfs2_glock_dq_uninit_m(2, ghs);
738 d_instantiate(dentry, inode);
739 return 0;
740
741 fail_gunlock2:
742 gfs2_glock_dq_uninit(ghs + 1);
743 fail_gunlock:
744 gfs2_glock_dq_uninit(ghs);
745 if (inode && !IS_ERR(inode)) {
746 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags);
747 iput(inode);
748 }
749 fail:
750 if (bh)
751 brelse(bh);
752 return error;
753 }
754
755 /**
756 * gfs2_create - Create a file
757 * @dir: The directory in which to create the file
758 * @dentry: The dentry of the new file
759 * @mode: The mode of the new file
760 *
761 * Returns: errno
762 */
763
764 static int gfs2_create(struct inode *dir, struct dentry *dentry,
765 int mode, struct nameidata *nd)
766 {
767 int excl = 0;
768 if (nd && (nd->flags & LOOKUP_EXCL))
769 excl = 1;
770 return gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0, excl);
771 }
772
773 /**
774 * gfs2_lookup - Look up a filename in a directory and return its inode
775 * @dir: The directory inode
776 * @dentry: The dentry of the new inode
777 * @nd: passed from Linux VFS, ignored by us
778 *
779 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
780 *
781 * Returns: errno
782 */
783
784 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
785 struct nameidata *nd)
786 {
787 struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0);
788 if (inode && !IS_ERR(inode)) {
789 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
790 struct gfs2_holder gh;
791 int error;
792 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
793 if (error) {
794 iput(inode);
795 return ERR_PTR(error);
796 }
797 gfs2_glock_dq_uninit(&gh);
798 }
799 return d_splice_alias(inode, dentry);
800 }
801
802 /**
803 * gfs2_link - Link to a file
804 * @old_dentry: The inode to link
805 * @dir: Add link to this directory
806 * @dentry: The name of the link
807 *
808 * Link the inode in "old_dentry" into the directory "dir" with the
809 * name in "dentry".
810 *
811 * Returns: errno
812 */
813
814 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
815 struct dentry *dentry)
816 {
817 struct gfs2_inode *dip = GFS2_I(dir);
818 struct gfs2_sbd *sdp = GFS2_SB(dir);
819 struct inode *inode = old_dentry->d_inode;
820 struct gfs2_inode *ip = GFS2_I(inode);
821 struct gfs2_holder ghs[2];
822 struct buffer_head *dibh;
823 int alloc_required;
824 int error;
825
826 if (S_ISDIR(inode->i_mode))
827 return -EPERM;
828
829 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
830 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
831
832 error = gfs2_glock_nq(ghs); /* parent */
833 if (error)
834 goto out_parent;
835
836 error = gfs2_glock_nq(ghs + 1); /* child */
837 if (error)
838 goto out_child;
839
840 error = -ENOENT;
841 if (inode->i_nlink == 0)
842 goto out_gunlock;
843
844 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
845 if (error)
846 goto out_gunlock;
847
848 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
849 switch (error) {
850 case -ENOENT:
851 break;
852 case 0:
853 error = -EEXIST;
854 default:
855 goto out_gunlock;
856 }
857
858 error = -EINVAL;
859 if (!dip->i_inode.i_nlink)
860 goto out_gunlock;
861 error = -EFBIG;
862 if (dip->i_entries == (u32)-1)
863 goto out_gunlock;
864 error = -EPERM;
865 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
866 goto out_gunlock;
867 error = -EINVAL;
868 if (!ip->i_inode.i_nlink)
869 goto out_gunlock;
870 error = -EMLINK;
871 if (ip->i_inode.i_nlink == (u32)-1)
872 goto out_gunlock;
873
874 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
875 if (error < 0)
876 goto out_gunlock;
877 error = 0;
878
879 if (alloc_required) {
880 struct gfs2_alloc *al = gfs2_alloc_get(dip);
881 if (!al) {
882 error = -ENOMEM;
883 goto out_gunlock;
884 }
885
886 error = gfs2_quota_lock_check(dip);
887 if (error)
888 goto out_alloc;
889
890 al->al_requested = sdp->sd_max_dirres;
891
892 error = gfs2_inplace_reserve(dip);
893 if (error)
894 goto out_gunlock_q;
895
896 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
897 gfs2_rg_blocks(al) +
898 2 * RES_DINODE + RES_STATFS +
899 RES_QUOTA, 0);
900 if (error)
901 goto out_ipres;
902 } else {
903 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
904 if (error)
905 goto out_ipres;
906 }
907
908 error = gfs2_meta_inode_buffer(ip, &dibh);
909 if (error)
910 goto out_end_trans;
911
912 error = gfs2_dir_add(dir, &dentry->d_name, ip);
913 if (error)
914 goto out_brelse;
915
916 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
917 inc_nlink(&ip->i_inode);
918 ip->i_inode.i_ctime = CURRENT_TIME;
919 ihold(inode);
920 d_instantiate(dentry, inode);
921 mark_inode_dirty(inode);
922
923 out_brelse:
924 brelse(dibh);
925 out_end_trans:
926 gfs2_trans_end(sdp);
927 out_ipres:
928 if (alloc_required)
929 gfs2_inplace_release(dip);
930 out_gunlock_q:
931 if (alloc_required)
932 gfs2_quota_unlock(dip);
933 out_alloc:
934 if (alloc_required)
935 gfs2_alloc_put(dip);
936 out_gunlock:
937 gfs2_glock_dq(ghs + 1);
938 out_child:
939 gfs2_glock_dq(ghs);
940 out_parent:
941 gfs2_holder_uninit(ghs);
942 gfs2_holder_uninit(ghs + 1);
943 return error;
944 }
945
946 /*
947 * gfs2_unlink_ok - check to see that a inode is still in a directory
948 * @dip: the directory
949 * @name: the name of the file
950 * @ip: the inode
951 *
952 * Assumes that the lock on (at least) @dip is held.
953 *
954 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
955 */
956
957 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
958 const struct gfs2_inode *ip)
959 {
960 int error;
961
962 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
963 return -EPERM;
964
965 if ((dip->i_inode.i_mode & S_ISVTX) &&
966 dip->i_inode.i_uid != current_fsuid() &&
967 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
968 return -EPERM;
969
970 if (IS_APPEND(&dip->i_inode))
971 return -EPERM;
972
973 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
974 if (error)
975 return error;
976
977 error = gfs2_dir_check(&dip->i_inode, name, ip);
978 if (error)
979 return error;
980
981 return 0;
982 }
983
984 /**
985 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
986 * @dip: The parent directory
987 * @name: The name of the entry in the parent directory
988 * @bh: The inode buffer for the inode to be removed
989 * @inode: The inode to be removed
990 *
991 * Called with all the locks and in a transaction. This will only be
992 * called for a directory after it has been checked to ensure it is empty.
993 *
994 * Returns: 0 on success, or an error
995 */
996
997 static int gfs2_unlink_inode(struct gfs2_inode *dip,
998 const struct dentry *dentry,
999 struct buffer_head *bh)
1000 {
1001 struct inode *inode = dentry->d_inode;
1002 struct gfs2_inode *ip = GFS2_I(inode);
1003 int error;
1004
1005 error = gfs2_dir_del(dip, dentry);
1006 if (error)
1007 return error;
1008
1009 ip->i_entries = 0;
1010 inode->i_ctime = CURRENT_TIME;
1011 if (S_ISDIR(inode->i_mode))
1012 clear_nlink(inode);
1013 else
1014 drop_nlink(inode);
1015 mark_inode_dirty(inode);
1016 if (inode->i_nlink == 0)
1017 gfs2_unlink_di(inode);
1018 return 0;
1019 }
1020
1021
1022 /**
1023 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1024 * @dir: The inode of the directory containing the inode to unlink
1025 * @dentry: The file itself
1026 *
1027 * This routine uses the type of the inode as a flag to figure out
1028 * whether this is an unlink or an rmdir.
1029 *
1030 * Returns: errno
1031 */
1032
1033 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1034 {
1035 struct gfs2_inode *dip = GFS2_I(dir);
1036 struct gfs2_sbd *sdp = GFS2_SB(dir);
1037 struct inode *inode = dentry->d_inode;
1038 struct gfs2_inode *ip = GFS2_I(inode);
1039 struct buffer_head *bh;
1040 struct gfs2_holder ghs[3];
1041 struct gfs2_rgrpd *rgd;
1042 struct gfs2_holder ri_gh;
1043 int error;
1044
1045 error = gfs2_rindex_hold(sdp, &ri_gh);
1046 if (error)
1047 return error;
1048
1049 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1050 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1051
1052 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
1053 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1054
1055
1056 error = gfs2_glock_nq(ghs); /* parent */
1057 if (error)
1058 goto out_parent;
1059
1060 error = gfs2_glock_nq(ghs + 1); /* child */
1061 if (error)
1062 goto out_child;
1063
1064 error = -ENOENT;
1065 if (inode->i_nlink == 0)
1066 goto out_rgrp;
1067
1068 if (S_ISDIR(inode->i_mode)) {
1069 error = -ENOTEMPTY;
1070 if (ip->i_entries > 2 || inode->i_nlink > 2)
1071 goto out_rgrp;
1072 }
1073
1074 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1075 if (error)
1076 goto out_rgrp;
1077
1078 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1079 if (error)
1080 goto out_gunlock;
1081
1082 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1083 if (error)
1084 goto out_gunlock;
1085
1086 error = gfs2_meta_inode_buffer(ip, &bh);
1087 if (error)
1088 goto out_end_trans;
1089
1090 error = gfs2_unlink_inode(dip, dentry, bh);
1091 brelse(bh);
1092
1093 out_end_trans:
1094 gfs2_trans_end(sdp);
1095 out_gunlock:
1096 gfs2_glock_dq(ghs + 2);
1097 out_rgrp:
1098 gfs2_holder_uninit(ghs + 2);
1099 gfs2_glock_dq(ghs + 1);
1100 out_child:
1101 gfs2_holder_uninit(ghs + 1);
1102 gfs2_glock_dq(ghs);
1103 out_parent:
1104 gfs2_holder_uninit(ghs);
1105 gfs2_glock_dq_uninit(&ri_gh);
1106 return error;
1107 }
1108
1109 /**
1110 * gfs2_symlink - Create a symlink
1111 * @dir: The directory to create the symlink in
1112 * @dentry: The dentry to put the symlink in
1113 * @symname: The thing which the link points to
1114 *
1115 * Returns: errno
1116 */
1117
1118 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1119 const char *symname)
1120 {
1121 struct gfs2_sbd *sdp = GFS2_SB(dir);
1122 unsigned int size;
1123
1124 size = strlen(symname);
1125 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1126 return -ENAMETOOLONG;
1127
1128 return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1129 }
1130
1131 /**
1132 * gfs2_mkdir - Make a directory
1133 * @dir: The parent directory of the new one
1134 * @dentry: The dentry of the new directory
1135 * @mode: The mode of the new directory
1136 *
1137 * Returns: errno
1138 */
1139
1140 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1141 {
1142 return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 0, 0);
1143 }
1144
1145 /**
1146 * gfs2_mknod - Make a special file
1147 * @dir: The directory in which the special file will reside
1148 * @dentry: The dentry of the special file
1149 * @mode: The mode of the special file
1150 * @dev: The device specification of the special file
1151 *
1152 */
1153
1154 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
1155 dev_t dev)
1156 {
1157 return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0, 0);
1158 }
1159
1160 /*
1161 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1162 * @this: move this
1163 * @to: to here
1164 *
1165 * Follow @to back to the root and make sure we don't encounter @this
1166 * Assumes we already hold the rename lock.
1167 *
1168 * Returns: errno
1169 */
1170
1171 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1172 {
1173 struct inode *dir = &to->i_inode;
1174 struct super_block *sb = dir->i_sb;
1175 struct inode *tmp;
1176 int error = 0;
1177
1178 igrab(dir);
1179
1180 for (;;) {
1181 if (dir == &this->i_inode) {
1182 error = -EINVAL;
1183 break;
1184 }
1185 if (dir == sb->s_root->d_inode) {
1186 error = 0;
1187 break;
1188 }
1189
1190 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1191 if (IS_ERR(tmp)) {
1192 error = PTR_ERR(tmp);
1193 break;
1194 }
1195
1196 iput(dir);
1197 dir = tmp;
1198 }
1199
1200 iput(dir);
1201
1202 return error;
1203 }
1204
1205 /**
1206 * gfs2_rename - Rename a file
1207 * @odir: Parent directory of old file name
1208 * @odentry: The old dentry of the file
1209 * @ndir: Parent directory of new file name
1210 * @ndentry: The new dentry of the file
1211 *
1212 * Returns: errno
1213 */
1214
1215 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1216 struct inode *ndir, struct dentry *ndentry)
1217 {
1218 struct gfs2_inode *odip = GFS2_I(odir);
1219 struct gfs2_inode *ndip = GFS2_I(ndir);
1220 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1221 struct gfs2_inode *nip = NULL;
1222 struct gfs2_sbd *sdp = GFS2_SB(odir);
1223 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }, ri_gh;
1224 struct gfs2_rgrpd *nrgd;
1225 unsigned int num_gh;
1226 int dir_rename = 0;
1227 int alloc_required = 0;
1228 unsigned int x;
1229 int error;
1230
1231 if (ndentry->d_inode) {
1232 nip = GFS2_I(ndentry->d_inode);
1233 if (ip == nip)
1234 return 0;
1235 }
1236
1237 error = gfs2_rindex_hold(sdp, &ri_gh);
1238 if (error)
1239 return error;
1240
1241 if (odip != ndip) {
1242 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1243 0, &r_gh);
1244 if (error)
1245 goto out;
1246
1247 if (S_ISDIR(ip->i_inode.i_mode)) {
1248 dir_rename = 1;
1249 /* don't move a dirctory into it's subdir */
1250 error = gfs2_ok_to_move(ip, ndip);
1251 if (error)
1252 goto out_gunlock_r;
1253 }
1254 }
1255
1256 num_gh = 1;
1257 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1258 if (odip != ndip) {
1259 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1260 num_gh++;
1261 }
1262 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1263 num_gh++;
1264
1265 if (nip) {
1266 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1267 num_gh++;
1268 /* grab the resource lock for unlink flag twiddling
1269 * this is the case of the target file already existing
1270 * so we unlink before doing the rename
1271 */
1272 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
1273 if (nrgd)
1274 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1275 }
1276
1277 for (x = 0; x < num_gh; x++) {
1278 error = gfs2_glock_nq(ghs + x);
1279 if (error)
1280 goto out_gunlock;
1281 }
1282
1283 error = -ENOENT;
1284 if (ip->i_inode.i_nlink == 0)
1285 goto out_gunlock;
1286
1287 /* Check out the old directory */
1288
1289 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1290 if (error)
1291 goto out_gunlock;
1292
1293 /* Check out the new directory */
1294
1295 if (nip) {
1296 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1297 if (error)
1298 goto out_gunlock;
1299
1300 if (nip->i_inode.i_nlink == 0) {
1301 error = -EAGAIN;
1302 goto out_gunlock;
1303 }
1304
1305 if (S_ISDIR(nip->i_inode.i_mode)) {
1306 if (nip->i_entries < 2) {
1307 gfs2_consist_inode(nip);
1308 error = -EIO;
1309 goto out_gunlock;
1310 }
1311 if (nip->i_entries > 2) {
1312 error = -ENOTEMPTY;
1313 goto out_gunlock;
1314 }
1315 }
1316 } else {
1317 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1318 if (error)
1319 goto out_gunlock;
1320
1321 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1322 switch (error) {
1323 case -ENOENT:
1324 error = 0;
1325 break;
1326 case 0:
1327 error = -EEXIST;
1328 default:
1329 goto out_gunlock;
1330 };
1331
1332 if (odip != ndip) {
1333 if (!ndip->i_inode.i_nlink) {
1334 error = -ENOENT;
1335 goto out_gunlock;
1336 }
1337 if (ndip->i_entries == (u32)-1) {
1338 error = -EFBIG;
1339 goto out_gunlock;
1340 }
1341 if (S_ISDIR(ip->i_inode.i_mode) &&
1342 ndip->i_inode.i_nlink == (u32)-1) {
1343 error = -EMLINK;
1344 goto out_gunlock;
1345 }
1346 }
1347 }
1348
1349 /* Check out the dir to be renamed */
1350
1351 if (dir_rename) {
1352 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1353 if (error)
1354 goto out_gunlock;
1355 }
1356
1357 if (nip == NULL)
1358 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1359 error = alloc_required;
1360 if (error < 0)
1361 goto out_gunlock;
1362 error = 0;
1363
1364 if (alloc_required) {
1365 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
1366 if (!al) {
1367 error = -ENOMEM;
1368 goto out_gunlock;
1369 }
1370
1371 error = gfs2_quota_lock_check(ndip);
1372 if (error)
1373 goto out_alloc;
1374
1375 al->al_requested = sdp->sd_max_dirres;
1376
1377 error = gfs2_inplace_reserve_ri(ndip);
1378 if (error)
1379 goto out_gunlock_q;
1380
1381 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1382 gfs2_rg_blocks(al) +
1383 4 * RES_DINODE + 4 * RES_LEAF +
1384 RES_STATFS + RES_QUOTA + 4, 0);
1385 if (error)
1386 goto out_ipreserv;
1387 } else {
1388 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1389 5 * RES_LEAF + 4, 0);
1390 if (error)
1391 goto out_gunlock;
1392 }
1393
1394 /* Remove the target file, if it exists */
1395
1396 if (nip) {
1397 struct buffer_head *bh;
1398 error = gfs2_meta_inode_buffer(nip, &bh);
1399 if (error)
1400 goto out_end_trans;
1401 error = gfs2_unlink_inode(ndip, ndentry, bh);
1402 brelse(bh);
1403 }
1404
1405 if (dir_rename) {
1406 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1407 if (error)
1408 goto out_end_trans;
1409 } else {
1410 struct buffer_head *dibh;
1411 error = gfs2_meta_inode_buffer(ip, &dibh);
1412 if (error)
1413 goto out_end_trans;
1414 ip->i_inode.i_ctime = CURRENT_TIME;
1415 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1416 gfs2_dinode_out(ip, dibh->b_data);
1417 brelse(dibh);
1418 }
1419
1420 error = gfs2_dir_del(odip, odentry);
1421 if (error)
1422 goto out_end_trans;
1423
1424 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1425 if (error)
1426 goto out_end_trans;
1427
1428 out_end_trans:
1429 gfs2_trans_end(sdp);
1430 out_ipreserv:
1431 if (alloc_required)
1432 gfs2_inplace_release(ndip);
1433 out_gunlock_q:
1434 if (alloc_required)
1435 gfs2_quota_unlock(ndip);
1436 out_alloc:
1437 if (alloc_required)
1438 gfs2_alloc_put(ndip);
1439 out_gunlock:
1440 while (x--) {
1441 gfs2_glock_dq(ghs + x);
1442 gfs2_holder_uninit(ghs + x);
1443 }
1444 out_gunlock_r:
1445 if (r_gh.gh_gl)
1446 gfs2_glock_dq_uninit(&r_gh);
1447 out:
1448 gfs2_glock_dq_uninit(&ri_gh);
1449 return error;
1450 }
1451
1452 /**
1453 * gfs2_follow_link - Follow a symbolic link
1454 * @dentry: The dentry of the link
1455 * @nd: Data that we pass to vfs_follow_link()
1456 *
1457 * This can handle symlinks of any size.
1458 *
1459 * Returns: 0 on success or error code
1460 */
1461
1462 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1463 {
1464 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1465 struct gfs2_holder i_gh;
1466 struct buffer_head *dibh;
1467 unsigned int size;
1468 char *buf;
1469 int error;
1470
1471 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1472 error = gfs2_glock_nq(&i_gh);
1473 if (error) {
1474 gfs2_holder_uninit(&i_gh);
1475 nd_set_link(nd, ERR_PTR(error));
1476 return NULL;
1477 }
1478
1479 size = (unsigned int)i_size_read(&ip->i_inode);
1480 if (size == 0) {
1481 gfs2_consist_inode(ip);
1482 buf = ERR_PTR(-EIO);
1483 goto out;
1484 }
1485
1486 error = gfs2_meta_inode_buffer(ip, &dibh);
1487 if (error) {
1488 buf = ERR_PTR(error);
1489 goto out;
1490 }
1491
1492 buf = kzalloc(size + 1, GFP_NOFS);
1493 if (!buf)
1494 buf = ERR_PTR(-ENOMEM);
1495 else
1496 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1497 brelse(dibh);
1498 out:
1499 gfs2_glock_dq_uninit(&i_gh);
1500 nd_set_link(nd, buf);
1501 return NULL;
1502 }
1503
1504 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1505 {
1506 char *s = nd_get_link(nd);
1507 if (!IS_ERR(s))
1508 kfree(s);
1509 }
1510
1511 /**
1512 * gfs2_permission -
1513 * @inode: The inode
1514 * @mask: The mask to be tested
1515 * @flags: Indicates whether this is an RCU path walk or not
1516 *
1517 * This may be called from the VFS directly, or from within GFS2 with the
1518 * inode locked, so we look to see if the glock is already locked and only
1519 * lock the glock if its not already been done.
1520 *
1521 * Returns: errno
1522 */
1523
1524 int gfs2_permission(struct inode *inode, int mask)
1525 {
1526 struct gfs2_inode *ip;
1527 struct gfs2_holder i_gh;
1528 int error;
1529 int unlock = 0;
1530
1531
1532 ip = GFS2_I(inode);
1533 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1534 if (mask & MAY_NOT_BLOCK)
1535 return -ECHILD;
1536 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1537 if (error)
1538 return error;
1539 unlock = 1;
1540 }
1541
1542 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1543 error = -EACCES;
1544 else
1545 error = generic_permission(inode, mask);
1546 if (unlock)
1547 gfs2_glock_dq_uninit(&i_gh);
1548
1549 return error;
1550 }
1551
1552 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1553 {
1554 setattr_copy(inode, attr);
1555 mark_inode_dirty(inode);
1556 return 0;
1557 }
1558
1559 /**
1560 * gfs2_setattr_simple -
1561 * @ip:
1562 * @attr:
1563 *
1564 * Returns: errno
1565 */
1566
1567 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1568 {
1569 int error;
1570
1571 if (current->journal_info)
1572 return __gfs2_setattr_simple(inode, attr);
1573
1574 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1575 if (error)
1576 return error;
1577
1578 error = __gfs2_setattr_simple(inode, attr);
1579 gfs2_trans_end(GFS2_SB(inode));
1580 return error;
1581 }
1582
1583 static int setattr_chown(struct inode *inode, struct iattr *attr)
1584 {
1585 struct gfs2_inode *ip = GFS2_I(inode);
1586 struct gfs2_sbd *sdp = GFS2_SB(inode);
1587 u32 ouid, ogid, nuid, ngid;
1588 int error;
1589
1590 ouid = inode->i_uid;
1591 ogid = inode->i_gid;
1592 nuid = attr->ia_uid;
1593 ngid = attr->ia_gid;
1594
1595 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1596 ouid = nuid = NO_QUOTA_CHANGE;
1597 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1598 ogid = ngid = NO_QUOTA_CHANGE;
1599
1600 if (!gfs2_alloc_get(ip))
1601 return -ENOMEM;
1602
1603 error = gfs2_quota_lock(ip, nuid, ngid);
1604 if (error)
1605 goto out_alloc;
1606
1607 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1608 error = gfs2_quota_check(ip, nuid, ngid);
1609 if (error)
1610 goto out_gunlock_q;
1611 }
1612
1613 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1614 if (error)
1615 goto out_gunlock_q;
1616
1617 error = gfs2_setattr_simple(inode, attr);
1618 if (error)
1619 goto out_end_trans;
1620
1621 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1622 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1623 gfs2_quota_change(ip, -blocks, ouid, ogid);
1624 gfs2_quota_change(ip, blocks, nuid, ngid);
1625 }
1626
1627 out_end_trans:
1628 gfs2_trans_end(sdp);
1629 out_gunlock_q:
1630 gfs2_quota_unlock(ip);
1631 out_alloc:
1632 gfs2_alloc_put(ip);
1633 return error;
1634 }
1635
1636 /**
1637 * gfs2_setattr - Change attributes on an inode
1638 * @dentry: The dentry which is changing
1639 * @attr: The structure describing the change
1640 *
1641 * The VFS layer wants to change one or more of an inodes attributes. Write
1642 * that change out to disk.
1643 *
1644 * Returns: errno
1645 */
1646
1647 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1648 {
1649 struct inode *inode = dentry->d_inode;
1650 struct gfs2_inode *ip = GFS2_I(inode);
1651 struct gfs2_holder i_gh;
1652 int error;
1653
1654 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1655 if (error)
1656 return error;
1657
1658 error = -EPERM;
1659 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1660 goto out;
1661
1662 error = inode_change_ok(inode, attr);
1663 if (error)
1664 goto out;
1665
1666 if (attr->ia_valid & ATTR_SIZE)
1667 error = gfs2_setattr_size(inode, attr->ia_size);
1668 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1669 error = setattr_chown(inode, attr);
1670 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1671 error = gfs2_acl_chmod(ip, attr);
1672 else
1673 error = gfs2_setattr_simple(inode, attr);
1674
1675 out:
1676 if (!error)
1677 mark_inode_dirty(inode);
1678 gfs2_glock_dq_uninit(&i_gh);
1679 return error;
1680 }
1681
1682 /**
1683 * gfs2_getattr - Read out an inode's attributes
1684 * @mnt: The vfsmount the inode is being accessed from
1685 * @dentry: The dentry to stat
1686 * @stat: The inode's stats
1687 *
1688 * This may be called from the VFS directly, or from within GFS2 with the
1689 * inode locked, so we look to see if the glock is already locked and only
1690 * lock the glock if its not already been done. Note that its the NFS
1691 * readdirplus operation which causes this to be called (from filldir)
1692 * with the glock already held.
1693 *
1694 * Returns: errno
1695 */
1696
1697 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1698 struct kstat *stat)
1699 {
1700 struct inode *inode = dentry->d_inode;
1701 struct gfs2_inode *ip = GFS2_I(inode);
1702 struct gfs2_holder gh;
1703 int error;
1704 int unlock = 0;
1705
1706 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1707 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1708 if (error)
1709 return error;
1710 unlock = 1;
1711 }
1712
1713 generic_fillattr(inode, stat);
1714 if (unlock)
1715 gfs2_glock_dq_uninit(&gh);
1716
1717 return 0;
1718 }
1719
1720 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1721 const void *data, size_t size, int flags)
1722 {
1723 struct inode *inode = dentry->d_inode;
1724 struct gfs2_inode *ip = GFS2_I(inode);
1725 struct gfs2_holder gh;
1726 int ret;
1727
1728 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1729 ret = gfs2_glock_nq(&gh);
1730 if (ret == 0) {
1731 ret = generic_setxattr(dentry, name, data, size, flags);
1732 gfs2_glock_dq(&gh);
1733 }
1734 gfs2_holder_uninit(&gh);
1735 return ret;
1736 }
1737
1738 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1739 void *data, size_t size)
1740 {
1741 struct inode *inode = dentry->d_inode;
1742 struct gfs2_inode *ip = GFS2_I(inode);
1743 struct gfs2_holder gh;
1744 int ret;
1745
1746 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1747 ret = gfs2_glock_nq(&gh);
1748 if (ret == 0) {
1749 ret = generic_getxattr(dentry, name, data, size);
1750 gfs2_glock_dq(&gh);
1751 }
1752 gfs2_holder_uninit(&gh);
1753 return ret;
1754 }
1755
1756 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1757 {
1758 struct inode *inode = dentry->d_inode;
1759 struct gfs2_inode *ip = GFS2_I(inode);
1760 struct gfs2_holder gh;
1761 int ret;
1762
1763 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1764 ret = gfs2_glock_nq(&gh);
1765 if (ret == 0) {
1766 ret = generic_removexattr(dentry, name);
1767 gfs2_glock_dq(&gh);
1768 }
1769 gfs2_holder_uninit(&gh);
1770 return ret;
1771 }
1772
1773 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1774 u64 start, u64 len)
1775 {
1776 struct gfs2_inode *ip = GFS2_I(inode);
1777 struct gfs2_holder gh;
1778 int ret;
1779
1780 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1781 if (ret)
1782 return ret;
1783
1784 mutex_lock(&inode->i_mutex);
1785
1786 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1787 if (ret)
1788 goto out;
1789
1790 if (gfs2_is_stuffed(ip)) {
1791 u64 phys = ip->i_no_addr << inode->i_blkbits;
1792 u64 size = i_size_read(inode);
1793 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1794 FIEMAP_EXTENT_DATA_INLINE;
1795 phys += sizeof(struct gfs2_dinode);
1796 phys += start;
1797 if (start + len > size)
1798 len = size - start;
1799 if (start < size)
1800 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1801 len, flags);
1802 if (ret == 1)
1803 ret = 0;
1804 } else {
1805 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1806 gfs2_block_map);
1807 }
1808
1809 gfs2_glock_dq_uninit(&gh);
1810 out:
1811 mutex_unlock(&inode->i_mutex);
1812 return ret;
1813 }
1814
1815 const struct inode_operations gfs2_file_iops = {
1816 .permission = gfs2_permission,
1817 .setattr = gfs2_setattr,
1818 .getattr = gfs2_getattr,
1819 .setxattr = gfs2_setxattr,
1820 .getxattr = gfs2_getxattr,
1821 .listxattr = gfs2_listxattr,
1822 .removexattr = gfs2_removexattr,
1823 .fiemap = gfs2_fiemap,
1824 .get_acl = gfs2_get_acl,
1825 };
1826
1827 const struct inode_operations gfs2_dir_iops = {
1828 .create = gfs2_create,
1829 .lookup = gfs2_lookup,
1830 .link = gfs2_link,
1831 .unlink = gfs2_unlink,
1832 .symlink = gfs2_symlink,
1833 .mkdir = gfs2_mkdir,
1834 .rmdir = gfs2_unlink,
1835 .mknod = gfs2_mknod,
1836 .rename = gfs2_rename,
1837 .permission = gfs2_permission,
1838 .setattr = gfs2_setattr,
1839 .getattr = gfs2_getattr,
1840 .setxattr = gfs2_setxattr,
1841 .getxattr = gfs2_getxattr,
1842 .listxattr = gfs2_listxattr,
1843 .removexattr = gfs2_removexattr,
1844 .fiemap = gfs2_fiemap,
1845 .get_acl = gfs2_get_acl,
1846 };
1847
1848 const struct inode_operations gfs2_symlink_iops = {
1849 .readlink = generic_readlink,
1850 .follow_link = gfs2_follow_link,
1851 .put_link = gfs2_put_link,
1852 .permission = gfs2_permission,
1853 .setattr = gfs2_setattr,
1854 .getattr = gfs2_getattr,
1855 .setxattr = gfs2_setxattr,
1856 .getxattr = gfs2_getxattr,
1857 .listxattr = gfs2_listxattr,
1858 .removexattr = gfs2_removexattr,
1859 .fiemap = gfs2_fiemap,
1860 .get_acl = gfs2_get_acl,
1861 };
1862
linux-next