?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
gspca: Fix falling back to lower isoc alt settings
[zen-stable.git] / fs / gfs2 / inode.c
blobcfd4959b218cc1741a522d16ca5483aac7088c81
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 dip->i_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 gfs2_inplace_release(dip);
617
618 fail_quota_locks:
619 gfs2_quota_unlock(dip);
620
621 fail:
622 gfs2_alloc_put(dip);
623 return error;
624 }
625
626 int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
627 void *fs_info)
628 {
629 const struct xattr *xattr;
630 int err = 0;
631
632 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
633 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
634 xattr->value_len, 0,
635 GFS2_EATYPE_SECURITY);
636 if (err < 0)
637 break;
638 }
639 return err;
640 }
641
642 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
643 const struct qstr *qstr)
644 {
645 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
646 &gfs2_initxattrs, NULL);
647 }
648
649 /**
650 * gfs2_create_inode - Create a new inode
651 * @dir: The parent directory
652 * @dentry: The new dentry
653 * @mode: The permissions on the new inode
654 * @dev: For device nodes, this is the device number
655 * @symname: For symlinks, this is the link destination
656 * @size: The initial size of the inode (ignored for directories)
657 *
658 * Returns: 0 on success, or error code
659 */
660
661 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
662 unsigned int mode, dev_t dev, const char *symname,
663 unsigned int size, int excl)
664 {
665 const struct qstr *name = &dentry->d_name;
666 struct gfs2_holder ghs[2];
667 struct inode *inode = NULL;
668 struct gfs2_inode *dip = GFS2_I(dir);
669 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
670 struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
671 int error;
672 u64 generation;
673 struct buffer_head *bh = NULL;
674
675 if (!name->len || name->len > GFS2_FNAMESIZE)
676 return -ENAMETOOLONG;
677
678 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
679 if (error)
680 goto fail;
681
682 error = create_ok(dip, name, mode);
683 if ((error == -EEXIST) && S_ISREG(mode) && !excl) {
684 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
685 gfs2_glock_dq_uninit(ghs);
686 d_instantiate(dentry, inode);
687 return IS_ERR(inode) ? PTR_ERR(inode) : 0;
688 }
689 if (error)
690 goto fail_gunlock;
691
692 error = alloc_dinode(dip, &inum.no_addr, &generation);
693 if (error)
694 goto fail_gunlock;
695 inum.no_formal_ino = generation;
696
697 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
698 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
699 if (error)
700 goto fail_gunlock;
701
702 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, symname, size, &bh);
703 if (error)
704 goto fail_gunlock2;
705
706 inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr,
707 inum.no_formal_ino, 0);
708 if (IS_ERR(inode))
709 goto fail_gunlock2;
710
711 error = gfs2_inode_refresh(GFS2_I(inode));
712 if (error)
713 goto fail_gunlock2;
714
715 error = gfs2_acl_create(dip, inode);
716 if (error)
717 goto fail_gunlock2;
718
719 error = gfs2_security_init(dip, GFS2_I(inode), name);
720 if (error)
721 goto fail_gunlock2;
722
723 error = link_dinode(dip, name, GFS2_I(inode));
724 if (error)
725 goto fail_gunlock2;
726
727 if (bh)
728 brelse(bh);
729
730 gfs2_trans_end(sdp);
731 gfs2_inplace_release(dip);
732 gfs2_quota_unlock(dip);
733 gfs2_alloc_put(dip);
734 mark_inode_dirty(inode);
735 gfs2_glock_dq_uninit_m(2, ghs);
736 d_instantiate(dentry, inode);
737 return 0;
738
739 fail_gunlock2:
740 gfs2_glock_dq_uninit(ghs + 1);
741 fail_gunlock:
742 gfs2_glock_dq_uninit(ghs);
743 if (inode && !IS_ERR(inode)) {
744 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags);
745 iput(inode);
746 }
747 fail:
748 if (bh)
749 brelse(bh);
750 return error;
751 }
752
753 /**
754 * gfs2_create - Create a file
755 * @dir: The directory in which to create the file
756 * @dentry: The dentry of the new file
757 * @mode: The mode of the new file
758 *
759 * Returns: errno
760 */
761
762 static int gfs2_create(struct inode *dir, struct dentry *dentry,
763 int mode, struct nameidata *nd)
764 {
765 int excl = 0;
766 if (nd && (nd->flags & LOOKUP_EXCL))
767 excl = 1;
768 return gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0, excl);
769 }
770
771 /**
772 * gfs2_lookup - Look up a filename in a directory and return its inode
773 * @dir: The directory inode
774 * @dentry: The dentry of the new inode
775 * @nd: passed from Linux VFS, ignored by us
776 *
777 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
778 *
779 * Returns: errno
780 */
781
782 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
783 struct nameidata *nd)
784 {
785 struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0);
786 if (inode && !IS_ERR(inode)) {
787 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
788 struct gfs2_holder gh;
789 int error;
790 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
791 if (error) {
792 iput(inode);
793 return ERR_PTR(error);
794 }
795 gfs2_glock_dq_uninit(&gh);
796 }
797 return d_splice_alias(inode, dentry);
798 }
799
800 /**
801 * gfs2_link - Link to a file
802 * @old_dentry: The inode to link
803 * @dir: Add link to this directory
804 * @dentry: The name of the link
805 *
806 * Link the inode in "old_dentry" into the directory "dir" with the
807 * name in "dentry".
808 *
809 * Returns: errno
810 */
811
812 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
813 struct dentry *dentry)
814 {
815 struct gfs2_inode *dip = GFS2_I(dir);
816 struct gfs2_sbd *sdp = GFS2_SB(dir);
817 struct inode *inode = old_dentry->d_inode;
818 struct gfs2_inode *ip = GFS2_I(inode);
819 struct gfs2_holder ghs[2];
820 struct buffer_head *dibh;
821 int alloc_required;
822 int error;
823
824 if (S_ISDIR(inode->i_mode))
825 return -EPERM;
826
827 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
828 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
829
830 error = gfs2_glock_nq(ghs); /* parent */
831 if (error)
832 goto out_parent;
833
834 error = gfs2_glock_nq(ghs + 1); /* child */
835 if (error)
836 goto out_child;
837
838 error = -ENOENT;
839 if (inode->i_nlink == 0)
840 goto out_gunlock;
841
842 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
843 if (error)
844 goto out_gunlock;
845
846 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
847 switch (error) {
848 case -ENOENT:
849 break;
850 case 0:
851 error = -EEXIST;
852 default:
853 goto out_gunlock;
854 }
855
856 error = -EINVAL;
857 if (!dip->i_inode.i_nlink)
858 goto out_gunlock;
859 error = -EFBIG;
860 if (dip->i_entries == (u32)-1)
861 goto out_gunlock;
862 error = -EPERM;
863 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
864 goto out_gunlock;
865 error = -EINVAL;
866 if (!ip->i_inode.i_nlink)
867 goto out_gunlock;
868 error = -EMLINK;
869 if (ip->i_inode.i_nlink == (u32)-1)
870 goto out_gunlock;
871
872 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
873 if (error < 0)
874 goto out_gunlock;
875 error = 0;
876
877 if (alloc_required) {
878 struct gfs2_alloc *al = gfs2_alloc_get(dip);
879 if (!al) {
880 error = -ENOMEM;
881 goto out_gunlock;
882 }
883
884 error = gfs2_quota_lock_check(dip);
885 if (error)
886 goto out_alloc;
887
888 al->al_requested = sdp->sd_max_dirres;
889
890 error = gfs2_inplace_reserve(dip);
891 if (error)
892 goto out_gunlock_q;
893
894 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
895 gfs2_rg_blocks(dip) +
896 2 * RES_DINODE + RES_STATFS +
897 RES_QUOTA, 0);
898 if (error)
899 goto out_ipres;
900 } else {
901 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
902 if (error)
903 goto out_ipres;
904 }
905
906 error = gfs2_meta_inode_buffer(ip, &dibh);
907 if (error)
908 goto out_end_trans;
909
910 error = gfs2_dir_add(dir, &dentry->d_name, ip);
911 if (error)
912 goto out_brelse;
913
914 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
915 inc_nlink(&ip->i_inode);
916 ip->i_inode.i_ctime = CURRENT_TIME;
917 ihold(inode);
918 d_instantiate(dentry, inode);
919 mark_inode_dirty(inode);
920
921 out_brelse:
922 brelse(dibh);
923 out_end_trans:
924 gfs2_trans_end(sdp);
925 out_ipres:
926 if (alloc_required)
927 gfs2_inplace_release(dip);
928 out_gunlock_q:
929 if (alloc_required)
930 gfs2_quota_unlock(dip);
931 out_alloc:
932 if (alloc_required)
933 gfs2_alloc_put(dip);
934 out_gunlock:
935 gfs2_glock_dq(ghs + 1);
936 out_child:
937 gfs2_glock_dq(ghs);
938 out_parent:
939 gfs2_holder_uninit(ghs);
940 gfs2_holder_uninit(ghs + 1);
941 return error;
942 }
943
944 /*
945 * gfs2_unlink_ok - check to see that a inode is still in a directory
946 * @dip: the directory
947 * @name: the name of the file
948 * @ip: the inode
949 *
950 * Assumes that the lock on (at least) @dip is held.
951 *
952 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
953 */
954
955 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
956 const struct gfs2_inode *ip)
957 {
958 int error;
959
960 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
961 return -EPERM;
962
963 if ((dip->i_inode.i_mode & S_ISVTX) &&
964 dip->i_inode.i_uid != current_fsuid() &&
965 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
966 return -EPERM;
967
968 if (IS_APPEND(&dip->i_inode))
969 return -EPERM;
970
971 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
972 if (error)
973 return error;
974
975 error = gfs2_dir_check(&dip->i_inode, name, ip);
976 if (error)
977 return error;
978
979 return 0;
980 }
981
982 /**
983 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
984 * @dip: The parent directory
985 * @name: The name of the entry in the parent directory
986 * @bh: The inode buffer for the inode to be removed
987 * @inode: The inode to be removed
988 *
989 * Called with all the locks and in a transaction. This will only be
990 * called for a directory after it has been checked to ensure it is empty.
991 *
992 * Returns: 0 on success, or an error
993 */
994
995 static int gfs2_unlink_inode(struct gfs2_inode *dip,
996 const struct dentry *dentry,
997 struct buffer_head *bh)
998 {
999 struct inode *inode = dentry->d_inode;
1000 struct gfs2_inode *ip = GFS2_I(inode);
1001 int error;
1002
1003 error = gfs2_dir_del(dip, dentry);
1004 if (error)
1005 return error;
1006
1007 ip->i_entries = 0;
1008 inode->i_ctime = CURRENT_TIME;
1009 if (S_ISDIR(inode->i_mode))
1010 clear_nlink(inode);
1011 else
1012 drop_nlink(inode);
1013 mark_inode_dirty(inode);
1014 if (inode->i_nlink == 0)
1015 gfs2_unlink_di(inode);
1016 return 0;
1017 }
1018
1019
1020 /**
1021 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1022 * @dir: The inode of the directory containing the inode to unlink
1023 * @dentry: The file itself
1024 *
1025 * This routine uses the type of the inode as a flag to figure out
1026 * whether this is an unlink or an rmdir.
1027 *
1028 * Returns: errno
1029 */
1030
1031 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1032 {
1033 struct gfs2_inode *dip = GFS2_I(dir);
1034 struct gfs2_sbd *sdp = GFS2_SB(dir);
1035 struct inode *inode = dentry->d_inode;
1036 struct gfs2_inode *ip = GFS2_I(inode);
1037 struct buffer_head *bh;
1038 struct gfs2_holder ghs[3];
1039 struct gfs2_rgrpd *rgd;
1040 int error;
1041
1042 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1043 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1044
1045 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
1046 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1047
1048
1049 error = gfs2_glock_nq(ghs); /* parent */
1050 if (error)
1051 goto out_parent;
1052
1053 error = gfs2_glock_nq(ghs + 1); /* child */
1054 if (error)
1055 goto out_child;
1056
1057 error = -ENOENT;
1058 if (inode->i_nlink == 0)
1059 goto out_rgrp;
1060
1061 if (S_ISDIR(inode->i_mode)) {
1062 error = -ENOTEMPTY;
1063 if (ip->i_entries > 2 || inode->i_nlink > 2)
1064 goto out_rgrp;
1065 }
1066
1067 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1068 if (error)
1069 goto out_rgrp;
1070
1071 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1072 if (error)
1073 goto out_gunlock;
1074
1075 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1076 if (error)
1077 goto out_gunlock;
1078
1079 error = gfs2_meta_inode_buffer(ip, &bh);
1080 if (error)
1081 goto out_end_trans;
1082
1083 error = gfs2_unlink_inode(dip, dentry, bh);
1084 brelse(bh);
1085
1086 out_end_trans:
1087 gfs2_trans_end(sdp);
1088 out_gunlock:
1089 gfs2_glock_dq(ghs + 2);
1090 out_rgrp:
1091 gfs2_holder_uninit(ghs + 2);
1092 gfs2_glock_dq(ghs + 1);
1093 out_child:
1094 gfs2_holder_uninit(ghs + 1);
1095 gfs2_glock_dq(ghs);
1096 out_parent:
1097 gfs2_holder_uninit(ghs);
1098 return error;
1099 }
1100
1101 /**
1102 * gfs2_symlink - Create a symlink
1103 * @dir: The directory to create the symlink in
1104 * @dentry: The dentry to put the symlink in
1105 * @symname: The thing which the link points to
1106 *
1107 * Returns: errno
1108 */
1109
1110 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1111 const char *symname)
1112 {
1113 struct gfs2_sbd *sdp = GFS2_SB(dir);
1114 unsigned int size;
1115
1116 size = strlen(symname);
1117 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1118 return -ENAMETOOLONG;
1119
1120 return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1121 }
1122
1123 /**
1124 * gfs2_mkdir - Make a directory
1125 * @dir: The parent directory of the new one
1126 * @dentry: The dentry of the new directory
1127 * @mode: The mode of the new directory
1128 *
1129 * Returns: errno
1130 */
1131
1132 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1133 {
1134 return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 0, 0);
1135 }
1136
1137 /**
1138 * gfs2_mknod - Make a special file
1139 * @dir: The directory in which the special file will reside
1140 * @dentry: The dentry of the special file
1141 * @mode: The mode of the special file
1142 * @dev: The device specification of the special file
1143 *
1144 */
1145
1146 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
1147 dev_t dev)
1148 {
1149 return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0, 0);
1150 }
1151
1152 /*
1153 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1154 * @this: move this
1155 * @to: to here
1156 *
1157 * Follow @to back to the root and make sure we don't encounter @this
1158 * Assumes we already hold the rename lock.
1159 *
1160 * Returns: errno
1161 */
1162
1163 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1164 {
1165 struct inode *dir = &to->i_inode;
1166 struct super_block *sb = dir->i_sb;
1167 struct inode *tmp;
1168 int error = 0;
1169
1170 igrab(dir);
1171
1172 for (;;) {
1173 if (dir == &this->i_inode) {
1174 error = -EINVAL;
1175 break;
1176 }
1177 if (dir == sb->s_root->d_inode) {
1178 error = 0;
1179 break;
1180 }
1181
1182 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1183 if (IS_ERR(tmp)) {
1184 error = PTR_ERR(tmp);
1185 break;
1186 }
1187
1188 iput(dir);
1189 dir = tmp;
1190 }
1191
1192 iput(dir);
1193
1194 return error;
1195 }
1196
1197 /**
1198 * gfs2_rename - Rename a file
1199 * @odir: Parent directory of old file name
1200 * @odentry: The old dentry of the file
1201 * @ndir: Parent directory of new file name
1202 * @ndentry: The new dentry of the file
1203 *
1204 * Returns: errno
1205 */
1206
1207 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1208 struct inode *ndir, struct dentry *ndentry)
1209 {
1210 struct gfs2_inode *odip = GFS2_I(odir);
1211 struct gfs2_inode *ndip = GFS2_I(ndir);
1212 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1213 struct gfs2_inode *nip = NULL;
1214 struct gfs2_sbd *sdp = GFS2_SB(odir);
1215 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1216 struct gfs2_rgrpd *nrgd;
1217 unsigned int num_gh;
1218 int dir_rename = 0;
1219 int alloc_required = 0;
1220 unsigned int x;
1221 int error;
1222
1223 if (ndentry->d_inode) {
1224 nip = GFS2_I(ndentry->d_inode);
1225 if (ip == nip)
1226 return 0;
1227 }
1228
1229 if (odip != ndip) {
1230 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1231 0, &r_gh);
1232 if (error)
1233 goto out;
1234
1235 if (S_ISDIR(ip->i_inode.i_mode)) {
1236 dir_rename = 1;
1237 /* don't move a dirctory into it's subdir */
1238 error = gfs2_ok_to_move(ip, ndip);
1239 if (error)
1240 goto out_gunlock_r;
1241 }
1242 }
1243
1244 num_gh = 1;
1245 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1246 if (odip != ndip) {
1247 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1248 num_gh++;
1249 }
1250 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1251 num_gh++;
1252
1253 if (nip) {
1254 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1255 num_gh++;
1256 /* grab the resource lock for unlink flag twiddling
1257 * this is the case of the target file already existing
1258 * so we unlink before doing the rename
1259 */
1260 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
1261 if (nrgd)
1262 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1263 }
1264
1265 for (x = 0; x < num_gh; x++) {
1266 error = gfs2_glock_nq(ghs + x);
1267 if (error)
1268 goto out_gunlock;
1269 }
1270
1271 error = -ENOENT;
1272 if (ip->i_inode.i_nlink == 0)
1273 goto out_gunlock;
1274
1275 /* Check out the old directory */
1276
1277 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1278 if (error)
1279 goto out_gunlock;
1280
1281 /* Check out the new directory */
1282
1283 if (nip) {
1284 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1285 if (error)
1286 goto out_gunlock;
1287
1288 if (nip->i_inode.i_nlink == 0) {
1289 error = -EAGAIN;
1290 goto out_gunlock;
1291 }
1292
1293 if (S_ISDIR(nip->i_inode.i_mode)) {
1294 if (nip->i_entries < 2) {
1295 gfs2_consist_inode(nip);
1296 error = -EIO;
1297 goto out_gunlock;
1298 }
1299 if (nip->i_entries > 2) {
1300 error = -ENOTEMPTY;
1301 goto out_gunlock;
1302 }
1303 }
1304 } else {
1305 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1306 if (error)
1307 goto out_gunlock;
1308
1309 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1310 switch (error) {
1311 case -ENOENT:
1312 error = 0;
1313 break;
1314 case 0:
1315 error = -EEXIST;
1316 default:
1317 goto out_gunlock;
1318 };
1319
1320 if (odip != ndip) {
1321 if (!ndip->i_inode.i_nlink) {
1322 error = -ENOENT;
1323 goto out_gunlock;
1324 }
1325 if (ndip->i_entries == (u32)-1) {
1326 error = -EFBIG;
1327 goto out_gunlock;
1328 }
1329 if (S_ISDIR(ip->i_inode.i_mode) &&
1330 ndip->i_inode.i_nlink == (u32)-1) {
1331 error = -EMLINK;
1332 goto out_gunlock;
1333 }
1334 }
1335 }
1336
1337 /* Check out the dir to be renamed */
1338
1339 if (dir_rename) {
1340 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1341 if (error)
1342 goto out_gunlock;
1343 }
1344
1345 if (nip == NULL)
1346 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1347 error = alloc_required;
1348 if (error < 0)
1349 goto out_gunlock;
1350 error = 0;
1351
1352 if (alloc_required) {
1353 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
1354 if (!al) {
1355 error = -ENOMEM;
1356 goto out_gunlock;
1357 }
1358
1359 error = gfs2_quota_lock_check(ndip);
1360 if (error)
1361 goto out_alloc;
1362
1363 al->al_requested = sdp->sd_max_dirres;
1364
1365 error = gfs2_inplace_reserve(ndip);
1366 if (error)
1367 goto out_gunlock_q;
1368
1369 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1370 gfs2_rg_blocks(ndip) +
1371 4 * RES_DINODE + 4 * RES_LEAF +
1372 RES_STATFS + RES_QUOTA + 4, 0);
1373 if (error)
1374 goto out_ipreserv;
1375 } else {
1376 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1377 5 * RES_LEAF + 4, 0);
1378 if (error)
1379 goto out_gunlock;
1380 }
1381
1382 /* Remove the target file, if it exists */
1383
1384 if (nip) {
1385 struct buffer_head *bh;
1386 error = gfs2_meta_inode_buffer(nip, &bh);
1387 if (error)
1388 goto out_end_trans;
1389 error = gfs2_unlink_inode(ndip, ndentry, bh);
1390 brelse(bh);
1391 }
1392
1393 if (dir_rename) {
1394 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1395 if (error)
1396 goto out_end_trans;
1397 } else {
1398 struct buffer_head *dibh;
1399 error = gfs2_meta_inode_buffer(ip, &dibh);
1400 if (error)
1401 goto out_end_trans;
1402 ip->i_inode.i_ctime = CURRENT_TIME;
1403 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1404 gfs2_dinode_out(ip, dibh->b_data);
1405 brelse(dibh);
1406 }
1407
1408 error = gfs2_dir_del(odip, odentry);
1409 if (error)
1410 goto out_end_trans;
1411
1412 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1413 if (error)
1414 goto out_end_trans;
1415
1416 out_end_trans:
1417 gfs2_trans_end(sdp);
1418 out_ipreserv:
1419 if (alloc_required)
1420 gfs2_inplace_release(ndip);
1421 out_gunlock_q:
1422 if (alloc_required)
1423 gfs2_quota_unlock(ndip);
1424 out_alloc:
1425 if (alloc_required)
1426 gfs2_alloc_put(ndip);
1427 out_gunlock:
1428 while (x--) {
1429 gfs2_glock_dq(ghs + x);
1430 gfs2_holder_uninit(ghs + x);
1431 }
1432 out_gunlock_r:
1433 if (r_gh.gh_gl)
1434 gfs2_glock_dq_uninit(&r_gh);
1435 out:
1436 return error;
1437 }
1438
1439 /**
1440 * gfs2_follow_link - Follow a symbolic link
1441 * @dentry: The dentry of the link
1442 * @nd: Data that we pass to vfs_follow_link()
1443 *
1444 * This can handle symlinks of any size.
1445 *
1446 * Returns: 0 on success or error code
1447 */
1448
1449 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1450 {
1451 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1452 struct gfs2_holder i_gh;
1453 struct buffer_head *dibh;
1454 unsigned int size;
1455 char *buf;
1456 int error;
1457
1458 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1459 error = gfs2_glock_nq(&i_gh);
1460 if (error) {
1461 gfs2_holder_uninit(&i_gh);
1462 nd_set_link(nd, ERR_PTR(error));
1463 return NULL;
1464 }
1465
1466 size = (unsigned int)i_size_read(&ip->i_inode);
1467 if (size == 0) {
1468 gfs2_consist_inode(ip);
1469 buf = ERR_PTR(-EIO);
1470 goto out;
1471 }
1472
1473 error = gfs2_meta_inode_buffer(ip, &dibh);
1474 if (error) {
1475 buf = ERR_PTR(error);
1476 goto out;
1477 }
1478
1479 buf = kzalloc(size + 1, GFP_NOFS);
1480 if (!buf)
1481 buf = ERR_PTR(-ENOMEM);
1482 else
1483 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1484 brelse(dibh);
1485 out:
1486 gfs2_glock_dq_uninit(&i_gh);
1487 nd_set_link(nd, buf);
1488 return NULL;
1489 }
1490
1491 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1492 {
1493 char *s = nd_get_link(nd);
1494 if (!IS_ERR(s))
1495 kfree(s);
1496 }
1497
1498 /**
1499 * gfs2_permission -
1500 * @inode: The inode
1501 * @mask: The mask to be tested
1502 * @flags: Indicates whether this is an RCU path walk or not
1503 *
1504 * This may be called from the VFS directly, or from within GFS2 with the
1505 * inode locked, so we look to see if the glock is already locked and only
1506 * lock the glock if its not already been done.
1507 *
1508 * Returns: errno
1509 */
1510
1511 int gfs2_permission(struct inode *inode, int mask)
1512 {
1513 struct gfs2_inode *ip;
1514 struct gfs2_holder i_gh;
1515 int error;
1516 int unlock = 0;
1517
1518
1519 ip = GFS2_I(inode);
1520 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1521 if (mask & MAY_NOT_BLOCK)
1522 return -ECHILD;
1523 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1524 if (error)
1525 return error;
1526 unlock = 1;
1527 }
1528
1529 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1530 error = -EACCES;
1531 else
1532 error = generic_permission(inode, mask);
1533 if (unlock)
1534 gfs2_glock_dq_uninit(&i_gh);
1535
1536 return error;
1537 }
1538
1539 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1540 {
1541 setattr_copy(inode, attr);
1542 mark_inode_dirty(inode);
1543 return 0;
1544 }
1545
1546 /**
1547 * gfs2_setattr_simple -
1548 * @ip:
1549 * @attr:
1550 *
1551 * Returns: errno
1552 */
1553
1554 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1555 {
1556 int error;
1557
1558 if (current->journal_info)
1559 return __gfs2_setattr_simple(inode, attr);
1560
1561 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1562 if (error)
1563 return error;
1564
1565 error = __gfs2_setattr_simple(inode, attr);
1566 gfs2_trans_end(GFS2_SB(inode));
1567 return error;
1568 }
1569
1570 static int setattr_chown(struct inode *inode, struct iattr *attr)
1571 {
1572 struct gfs2_inode *ip = GFS2_I(inode);
1573 struct gfs2_sbd *sdp = GFS2_SB(inode);
1574 u32 ouid, ogid, nuid, ngid;
1575 int error;
1576
1577 ouid = inode->i_uid;
1578 ogid = inode->i_gid;
1579 nuid = attr->ia_uid;
1580 ngid = attr->ia_gid;
1581
1582 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1583 ouid = nuid = NO_QUOTA_CHANGE;
1584 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1585 ogid = ngid = NO_QUOTA_CHANGE;
1586
1587 if (!gfs2_alloc_get(ip))
1588 return -ENOMEM;
1589
1590 error = gfs2_quota_lock(ip, nuid, ngid);
1591 if (error)
1592 goto out_alloc;
1593
1594 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1595 error = gfs2_quota_check(ip, nuid, ngid);
1596 if (error)
1597 goto out_gunlock_q;
1598 }
1599
1600 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1601 if (error)
1602 goto out_gunlock_q;
1603
1604 error = gfs2_setattr_simple(inode, attr);
1605 if (error)
1606 goto out_end_trans;
1607
1608 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1609 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1610 gfs2_quota_change(ip, -blocks, ouid, ogid);
1611 gfs2_quota_change(ip, blocks, nuid, ngid);
1612 }
1613
1614 out_end_trans:
1615 gfs2_trans_end(sdp);
1616 out_gunlock_q:
1617 gfs2_quota_unlock(ip);
1618 out_alloc:
1619 gfs2_alloc_put(ip);
1620 return error;
1621 }
1622
1623 /**
1624 * gfs2_setattr - Change attributes on an inode
1625 * @dentry: The dentry which is changing
1626 * @attr: The structure describing the change
1627 *
1628 * The VFS layer wants to change one or more of an inodes attributes. Write
1629 * that change out to disk.
1630 *
1631 * Returns: errno
1632 */
1633
1634 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1635 {
1636 struct inode *inode = dentry->d_inode;
1637 struct gfs2_inode *ip = GFS2_I(inode);
1638 struct gfs2_holder i_gh;
1639 int error;
1640
1641 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1642 if (error)
1643 return error;
1644
1645 error = -EPERM;
1646 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1647 goto out;
1648
1649 error = inode_change_ok(inode, attr);
1650 if (error)
1651 goto out;
1652
1653 if (attr->ia_valid & ATTR_SIZE)
1654 error = gfs2_setattr_size(inode, attr->ia_size);
1655 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1656 error = setattr_chown(inode, attr);
1657 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1658 error = gfs2_acl_chmod(ip, attr);
1659 else
1660 error = gfs2_setattr_simple(inode, attr);
1661
1662 out:
1663 if (!error)
1664 mark_inode_dirty(inode);
1665 gfs2_glock_dq_uninit(&i_gh);
1666 return error;
1667 }
1668
1669 /**
1670 * gfs2_getattr - Read out an inode's attributes
1671 * @mnt: The vfsmount the inode is being accessed from
1672 * @dentry: The dentry to stat
1673 * @stat: The inode's stats
1674 *
1675 * This may be called from the VFS directly, or from within GFS2 with the
1676 * inode locked, so we look to see if the glock is already locked and only
1677 * lock the glock if its not already been done. Note that its the NFS
1678 * readdirplus operation which causes this to be called (from filldir)
1679 * with the glock already held.
1680 *
1681 * Returns: errno
1682 */
1683
1684 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1685 struct kstat *stat)
1686 {
1687 struct inode *inode = dentry->d_inode;
1688 struct gfs2_inode *ip = GFS2_I(inode);
1689 struct gfs2_holder gh;
1690 int error;
1691 int unlock = 0;
1692
1693 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1694 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1695 if (error)
1696 return error;
1697 unlock = 1;
1698 }
1699
1700 generic_fillattr(inode, stat);
1701 if (unlock)
1702 gfs2_glock_dq_uninit(&gh);
1703
1704 return 0;
1705 }
1706
1707 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1708 const void *data, size_t size, int flags)
1709 {
1710 struct inode *inode = dentry->d_inode;
1711 struct gfs2_inode *ip = GFS2_I(inode);
1712 struct gfs2_holder gh;
1713 int ret;
1714
1715 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1716 ret = gfs2_glock_nq(&gh);
1717 if (ret == 0) {
1718 ret = generic_setxattr(dentry, name, data, size, flags);
1719 gfs2_glock_dq(&gh);
1720 }
1721 gfs2_holder_uninit(&gh);
1722 return ret;
1723 }
1724
1725 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1726 void *data, size_t size)
1727 {
1728 struct inode *inode = dentry->d_inode;
1729 struct gfs2_inode *ip = GFS2_I(inode);
1730 struct gfs2_holder gh;
1731 int ret;
1732
1733 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1734 ret = gfs2_glock_nq(&gh);
1735 if (ret == 0) {
1736 ret = generic_getxattr(dentry, name, data, size);
1737 gfs2_glock_dq(&gh);
1738 }
1739 gfs2_holder_uninit(&gh);
1740 return ret;
1741 }
1742
1743 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1744 {
1745 struct inode *inode = dentry->d_inode;
1746 struct gfs2_inode *ip = GFS2_I(inode);
1747 struct gfs2_holder gh;
1748 int ret;
1749
1750 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1751 ret = gfs2_glock_nq(&gh);
1752 if (ret == 0) {
1753 ret = generic_removexattr(dentry, name);
1754 gfs2_glock_dq(&gh);
1755 }
1756 gfs2_holder_uninit(&gh);
1757 return ret;
1758 }
1759
1760 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1761 u64 start, u64 len)
1762 {
1763 struct gfs2_inode *ip = GFS2_I(inode);
1764 struct gfs2_holder gh;
1765 int ret;
1766
1767 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1768 if (ret)
1769 return ret;
1770
1771 mutex_lock(&inode->i_mutex);
1772
1773 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1774 if (ret)
1775 goto out;
1776
1777 if (gfs2_is_stuffed(ip)) {
1778 u64 phys = ip->i_no_addr << inode->i_blkbits;
1779 u64 size = i_size_read(inode);
1780 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1781 FIEMAP_EXTENT_DATA_INLINE;
1782 phys += sizeof(struct gfs2_dinode);
1783 phys += start;
1784 if (start + len > size)
1785 len = size - start;
1786 if (start < size)
1787 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1788 len, flags);
1789 if (ret == 1)
1790 ret = 0;
1791 } else {
1792 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1793 gfs2_block_map);
1794 }
1795
1796 gfs2_glock_dq_uninit(&gh);
1797 out:
1798 mutex_unlock(&inode->i_mutex);
1799 return ret;
1800 }
1801
1802 const struct inode_operations gfs2_file_iops = {
1803 .permission = gfs2_permission,
1804 .setattr = gfs2_setattr,
1805 .getattr = gfs2_getattr,
1806 .setxattr = gfs2_setxattr,
1807 .getxattr = gfs2_getxattr,
1808 .listxattr = gfs2_listxattr,
1809 .removexattr = gfs2_removexattr,
1810 .fiemap = gfs2_fiemap,
1811 .get_acl = gfs2_get_acl,
1812 };
1813
1814 const struct inode_operations gfs2_dir_iops = {
1815 .create = gfs2_create,
1816 .lookup = gfs2_lookup,
1817 .link = gfs2_link,
1818 .unlink = gfs2_unlink,
1819 .symlink = gfs2_symlink,
1820 .mkdir = gfs2_mkdir,
1821 .rmdir = gfs2_unlink,
1822 .mknod = gfs2_mknod,
1823 .rename = gfs2_rename,
1824 .permission = gfs2_permission,
1825 .setattr = gfs2_setattr,
1826 .getattr = gfs2_getattr,
1827 .setxattr = gfs2_setxattr,
1828 .getxattr = gfs2_getxattr,
1829 .listxattr = gfs2_listxattr,
1830 .removexattr = gfs2_removexattr,
1831 .fiemap = gfs2_fiemap,
1832 .get_acl = gfs2_get_acl,
1833 };
1834
1835 const struct inode_operations gfs2_symlink_iops = {
1836 .readlink = generic_readlink,
1837 .follow_link = gfs2_follow_link,
1838 .put_link = gfs2_put_link,
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