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Btrfs: make sure the backref walker catches all refs to our extent
[deliverable/linux.git] / fs / gfs2 / inode.c
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_flags |= GL_NOCACHE;
193 ip->i_iopen_gh.gh_gl->gl_object = NULL;
194 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
195 fail_iopen:
196 if (io_gl)
197 gfs2_glock_put(io_gl);
198 fail_put:
199 ip->i_gl->gl_object = NULL;
200 gfs2_glock_put(ip->i_gl);
201 fail:
202 iget_failed(inode);
203 return ERR_PTR(error);
204 }
205
206 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
207 u64 *no_formal_ino, unsigned int blktype)
208 {
209 struct super_block *sb = sdp->sd_vfs;
210 struct gfs2_holder i_gh;
211 struct inode *inode = NULL;
212 int error;
213
214 /* Must not read in block until block type is verified */
215 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
216 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
217 if (error)
218 return ERR_PTR(error);
219
220 error = gfs2_check_blk_type(sdp, no_addr, blktype);
221 if (error)
222 goto fail;
223
224 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
225 if (IS_ERR(inode))
226 goto fail;
227
228 /* Two extra checks for NFS only */
229 if (no_formal_ino) {
230 error = -ESTALE;
231 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
232 goto fail_iput;
233
234 error = -EIO;
235 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
236 goto fail_iput;
237
238 error = 0;
239 }
240
241 fail:
242 gfs2_glock_dq_uninit(&i_gh);
243 return error ? ERR_PTR(error) : inode;
244 fail_iput:
245 iput(inode);
246 goto fail;
247 }
248
249
250 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
251 {
252 struct qstr qstr;
253 struct inode *inode;
254 gfs2_str2qstr(&qstr, name);
255 inode = gfs2_lookupi(dip, &qstr, 1);
256 /* gfs2_lookupi has inconsistent callers: vfs
257 * related routines expect NULL for no entry found,
258 * gfs2_lookup_simple callers expect ENOENT
259 * and do not check for NULL.
260 */
261 if (inode == NULL)
262 return ERR_PTR(-ENOENT);
263 else
264 return inode;
265 }
266
267
268 /**
269 * gfs2_lookupi - Look up a filename in a directory and return its inode
270 * @d_gh: An initialized holder for the directory glock
271 * @name: The name of the inode to look for
272 * @is_root: If 1, ignore the caller's permissions
273 * @i_gh: An uninitialized holder for the new inode glock
274 *
275 * This can be called via the VFS filldir function when NFS is doing
276 * a readdirplus and the inode which its intending to stat isn't
277 * already in cache. In this case we must not take the directory glock
278 * again, since the readdir call will have already taken that lock.
279 *
280 * Returns: errno
281 */
282
283 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
284 int is_root)
285 {
286 struct super_block *sb = dir->i_sb;
287 struct gfs2_inode *dip = GFS2_I(dir);
288 struct gfs2_holder d_gh;
289 int error = 0;
290 struct inode *inode = NULL;
291 int unlock = 0;
292
293 if (!name->len || name->len > GFS2_FNAMESIZE)
294 return ERR_PTR(-ENAMETOOLONG);
295
296 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
297 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
298 dir == sb->s_root->d_inode)) {
299 igrab(dir);
300 return dir;
301 }
302
303 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
304 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
305 if (error)
306 return ERR_PTR(error);
307 unlock = 1;
308 }
309
310 if (!is_root) {
311 error = gfs2_permission(dir, MAY_EXEC);
312 if (error)
313 goto out;
314 }
315
316 inode = gfs2_dir_search(dir, name, false);
317 if (IS_ERR(inode))
318 error = PTR_ERR(inode);
319 out:
320 if (unlock)
321 gfs2_glock_dq_uninit(&d_gh);
322 if (error == -ENOENT)
323 return NULL;
324 return inode ? inode : ERR_PTR(error);
325 }
326
327 /**
328 * create_ok - OK to create a new on-disk inode here?
329 * @dip: Directory in which dinode is to be created
330 * @name: Name of new dinode
331 * @mode:
332 *
333 * Returns: errno
334 */
335
336 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
337 umode_t mode)
338 {
339 int error;
340
341 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
342 if (error)
343 return error;
344
345 /* Don't create entries in an unlinked directory */
346 if (!dip->i_inode.i_nlink)
347 return -ENOENT;
348
349 if (dip->i_entries == (u32)-1)
350 return -EFBIG;
351 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
352 return -EMLINK;
353
354 return 0;
355 }
356
357 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
358 struct inode *inode)
359 {
360 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
361 (dip->i_inode.i_mode & S_ISUID) &&
362 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
363 if (S_ISDIR(inode->i_mode))
364 inode->i_mode |= S_ISUID;
365 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
366 inode->i_mode &= ~07111;
367 inode->i_uid = dip->i_inode.i_uid;
368 } else
369 inode->i_uid = current_fsuid();
370
371 if (dip->i_inode.i_mode & S_ISGID) {
372 if (S_ISDIR(inode->i_mode))
373 inode->i_mode |= S_ISGID;
374 inode->i_gid = dip->i_inode.i_gid;
375 } else
376 inode->i_gid = current_fsgid();
377 }
378
379 static int alloc_dinode(struct gfs2_inode *ip, u32 flags)
380 {
381 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
382 int error;
383 int dblocks = 1;
384
385 error = gfs2_quota_lock_check(ip);
386 if (error)
387 goto out;
388
389 error = gfs2_inplace_reserve(ip, RES_DINODE, flags);
390 if (error)
391 goto out_quota;
392
393 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 0);
394 if (error)
395 goto out_ipreserv;
396
397 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, &dblocks, 1, &ip->i_generation);
398 ip->i_no_formal_ino = ip->i_generation;
399 ip->i_inode.i_ino = ip->i_no_addr;
400 ip->i_goal = ip->i_no_addr;
401
402 gfs2_trans_end(sdp);
403
404 out_ipreserv:
405 gfs2_inplace_release(ip);
406 out_quota:
407 gfs2_quota_unlock(ip);
408 out:
409 return error;
410 }
411
412 static void gfs2_init_dir(struct buffer_head *dibh,
413 const struct gfs2_inode *parent)
414 {
415 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
416 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
417
418 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
419 dent->de_inum = di->di_num; /* already GFS2 endian */
420 dent->de_type = cpu_to_be16(DT_DIR);
421
422 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
423 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
424 gfs2_inum_out(parent, dent);
425 dent->de_type = cpu_to_be16(DT_DIR);
426
427 }
428
429 /**
430 * init_dinode - Fill in a new dinode structure
431 * @dip: The directory this inode is being created in
432 * @ip: The inode
433 * @symname: The symlink destination (if a symlink)
434 * @bhp: The buffer head (returned to caller)
435 *
436 */
437
438 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
439 const char *symname)
440 {
441 struct gfs2_dinode *di;
442 struct buffer_head *dibh;
443
444 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
445 gfs2_trans_add_meta(ip->i_gl, dibh);
446 di = (struct gfs2_dinode *)dibh->b_data;
447 gfs2_dinode_out(ip, di);
448
449 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
450 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
451 di->__pad1 = 0;
452 di->__pad2 = 0;
453 di->__pad3 = 0;
454 memset(&di->__pad4, 0, sizeof(di->__pad4));
455 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
456 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
457
458 switch(ip->i_inode.i_mode & S_IFMT) {
459 case S_IFDIR:
460 gfs2_init_dir(dibh, dip);
461 break;
462 case S_IFLNK:
463 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
464 break;
465 }
466
467 set_buffer_uptodate(dibh);
468 brelse(dibh);
469 }
470
471 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
472 struct gfs2_inode *ip, int arq)
473 {
474 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
475 int error;
476
477 if (arq) {
478 error = gfs2_quota_lock_check(dip);
479 if (error)
480 goto fail_quota_locks;
481
482 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0);
483 if (error)
484 goto fail_quota_locks;
485
486 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
487 dip->i_rgd->rd_length +
488 2 * RES_DINODE +
489 RES_STATFS + RES_QUOTA, 0);
490 if (error)
491 goto fail_ipreserv;
492 } else {
493 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
494 if (error)
495 goto fail_quota_locks;
496 }
497
498 error = gfs2_dir_add(&dip->i_inode, name, ip);
499 if (error)
500 goto fail_end_trans;
501
502 fail_end_trans:
503 gfs2_trans_end(sdp);
504 fail_ipreserv:
505 gfs2_inplace_release(dip);
506 fail_quota_locks:
507 gfs2_quota_unlock(dip);
508 return error;
509 }
510
511 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
512 void *fs_info)
513 {
514 const struct xattr *xattr;
515 int err = 0;
516
517 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
518 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
519 xattr->value_len, 0,
520 GFS2_EATYPE_SECURITY);
521 if (err < 0)
522 break;
523 }
524 return err;
525 }
526
527 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
528 const struct qstr *qstr)
529 {
530 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
531 &gfs2_initxattrs, NULL);
532 }
533
534 /**
535 * gfs2_create_inode - Create a new inode
536 * @dir: The parent directory
537 * @dentry: The new dentry
538 * @file: If non-NULL, the file which is being opened
539 * @mode: The permissions on the new inode
540 * @dev: For device nodes, this is the device number
541 * @symname: For symlinks, this is the link destination
542 * @size: The initial size of the inode (ignored for directories)
543 *
544 * Returns: 0 on success, or error code
545 */
546
547 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
548 struct file *file,
549 umode_t mode, dev_t dev, const char *symname,
550 unsigned int size, int excl, int *opened)
551 {
552 const struct qstr *name = &dentry->d_name;
553 struct gfs2_holder ghs[2];
554 struct inode *inode = NULL;
555 struct gfs2_inode *dip = GFS2_I(dir), *ip;
556 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
557 struct gfs2_glock *io_gl;
558 struct dentry *d;
559 int error;
560 u32 aflags = 0;
561 int arq;
562
563 if (!name->len || name->len > GFS2_FNAMESIZE)
564 return -ENAMETOOLONG;
565
566 error = gfs2_rs_alloc(dip);
567 if (error)
568 return error;
569
570 error = gfs2_rindex_update(sdp);
571 if (error)
572 return error;
573
574 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
575 if (error)
576 goto fail;
577
578 error = create_ok(dip, name, mode);
579 if (error)
580 goto fail_gunlock;
581
582 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
583 error = PTR_ERR(inode);
584 if (!IS_ERR(inode)) {
585 d = d_splice_alias(inode, dentry);
586 error = 0;
587 if (file && !IS_ERR(d)) {
588 if (d == NULL)
589 d = dentry;
590 if (S_ISREG(inode->i_mode))
591 error = finish_open(file, d, gfs2_open_common, opened);
592 else
593 error = finish_no_open(file, d);
594 }
595 gfs2_glock_dq_uninit(ghs);
596 if (IS_ERR(d))
597 return PTR_RET(d);
598 return error;
599 } else if (error != -ENOENT) {
600 goto fail_gunlock;
601 }
602
603 arq = error = gfs2_diradd_alloc_required(dir, name);
604 if (error < 0)
605 goto fail_gunlock;
606
607 inode = new_inode(sdp->sd_vfs);
608 error = -ENOMEM;
609 if (!inode)
610 goto fail_gunlock;
611
612 ip = GFS2_I(inode);
613 error = gfs2_rs_alloc(ip);
614 if (error)
615 goto fail_free_inode;
616
617 inode->i_mode = mode;
618 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
619 inode->i_rdev = dev;
620 inode->i_size = size;
621 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
622 gfs2_set_inode_blocks(inode, 1);
623 munge_mode_uid_gid(dip, inode);
624 ip->i_goal = dip->i_goal;
625 ip->i_diskflags = 0;
626 ip->i_eattr = 0;
627 ip->i_height = 0;
628 ip->i_depth = 0;
629 ip->i_entries = 0;
630
631 switch(mode & S_IFMT) {
632 case S_IFREG:
633 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
634 gfs2_tune_get(sdp, gt_new_files_jdata))
635 ip->i_diskflags |= GFS2_DIF_JDATA;
636 gfs2_set_aops(inode);
637 break;
638 case S_IFDIR:
639 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
640 ip->i_diskflags |= GFS2_DIF_JDATA;
641 ip->i_entries = 2;
642 break;
643 }
644 gfs2_set_inode_flags(inode);
645
646 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) ||
647 (dip->i_diskflags & GFS2_DIF_TOPDIR))
648 aflags |= GFS2_AF_ORLOV;
649
650 error = alloc_dinode(ip, aflags);
651 if (error)
652 goto fail_free_inode;
653
654 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
655 if (error)
656 goto fail_free_inode;
657
658 ip->i_gl->gl_object = ip;
659 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
660 if (error)
661 goto fail_free_inode;
662
663 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
664 if (error)
665 goto fail_gunlock2;
666
667 init_dinode(dip, ip, symname);
668 gfs2_trans_end(sdp);
669
670 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
671 if (error)
672 goto fail_gunlock2;
673
674 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
675 if (error)
676 goto fail_gunlock2;
677
678 ip->i_iopen_gh.gh_gl->gl_object = ip;
679 gfs2_glock_put(io_gl);
680 gfs2_set_iop(inode);
681 insert_inode_hash(inode);
682
683 error = gfs2_acl_create(dip, inode);
684 if (error)
685 goto fail_gunlock3;
686
687 error = gfs2_security_init(dip, ip, name);
688 if (error)
689 goto fail_gunlock3;
690
691 error = link_dinode(dip, name, ip, arq);
692 if (error)
693 goto fail_gunlock3;
694
695 mark_inode_dirty(inode);
696 d_instantiate(dentry, inode);
697 if (file)
698 error = finish_open(file, dentry, gfs2_open_common, opened);
699 gfs2_glock_dq_uninit(ghs);
700 gfs2_glock_dq_uninit(ghs + 1);
701 return error;
702
703 fail_gunlock3:
704 gfs2_glock_dq_uninit(ghs + 1);
705 if (ip->i_gl)
706 gfs2_glock_put(ip->i_gl);
707 goto fail_gunlock;
708
709 fail_gunlock2:
710 gfs2_glock_dq_uninit(ghs + 1);
711 fail_free_inode:
712 if (ip->i_gl)
713 gfs2_glock_put(ip->i_gl);
714 gfs2_rs_delete(ip);
715 free_inode_nonrcu(inode);
716 inode = NULL;
717 fail_gunlock:
718 gfs2_glock_dq_uninit(ghs);
719 if (inode && !IS_ERR(inode)) {
720 clear_nlink(inode);
721 mark_inode_dirty(inode);
722 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags);
723 iput(inode);
724 }
725 fail:
726 return error;
727 }
728
729 /**
730 * gfs2_create - Create a file
731 * @dir: The directory in which to create the file
732 * @dentry: The dentry of the new file
733 * @mode: The mode of the new file
734 *
735 * Returns: errno
736 */
737
738 static int gfs2_create(struct inode *dir, struct dentry *dentry,
739 umode_t mode, bool excl)
740 {
741 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
742 }
743
744 /**
745 * __gfs2_lookup - Look up a filename in a directory and return its inode
746 * @dir: The directory inode
747 * @dentry: The dentry of the new inode
748 * @file: File to be opened
749 * @opened: atomic_open flags
750 *
751 *
752 * Returns: errno
753 */
754
755 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
756 struct file *file, int *opened)
757 {
758 struct inode *inode;
759 struct dentry *d;
760 struct gfs2_holder gh;
761 struct gfs2_glock *gl;
762 int error;
763
764 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
765 if (!inode)
766 return NULL;
767 if (IS_ERR(inode))
768 return ERR_CAST(inode);
769
770 gl = GFS2_I(inode)->i_gl;
771 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
772 if (error) {
773 iput(inode);
774 return ERR_PTR(error);
775 }
776
777 d = d_splice_alias(inode, dentry);
778 if (file && S_ISREG(inode->i_mode))
779 error = finish_open(file, dentry, gfs2_open_common, opened);
780
781 gfs2_glock_dq_uninit(&gh);
782 if (error)
783 return ERR_PTR(error);
784 return d;
785 }
786
787 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
788 unsigned flags)
789 {
790 return __gfs2_lookup(dir, dentry, NULL, NULL);
791 }
792
793 /**
794 * gfs2_link - Link to a file
795 * @old_dentry: The inode to link
796 * @dir: Add link to this directory
797 * @dentry: The name of the link
798 *
799 * Link the inode in "old_dentry" into the directory "dir" with the
800 * name in "dentry".
801 *
802 * Returns: errno
803 */
804
805 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
806 struct dentry *dentry)
807 {
808 struct gfs2_inode *dip = GFS2_I(dir);
809 struct gfs2_sbd *sdp = GFS2_SB(dir);
810 struct inode *inode = old_dentry->d_inode;
811 struct gfs2_inode *ip = GFS2_I(inode);
812 struct gfs2_holder ghs[2];
813 struct buffer_head *dibh;
814 int alloc_required;
815 int error;
816
817 if (S_ISDIR(inode->i_mode))
818 return -EPERM;
819
820 error = gfs2_rs_alloc(dip);
821 if (error)
822 return error;
823
824 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
825 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
826
827 error = gfs2_glock_nq(ghs); /* parent */
828 if (error)
829 goto out_parent;
830
831 error = gfs2_glock_nq(ghs + 1); /* child */
832 if (error)
833 goto out_child;
834
835 error = -ENOENT;
836 if (inode->i_nlink == 0)
837 goto out_gunlock;
838
839 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
840 if (error)
841 goto out_gunlock;
842
843 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
844 switch (error) {
845 case -ENOENT:
846 break;
847 case 0:
848 error = -EEXIST;
849 default:
850 goto out_gunlock;
851 }
852
853 error = -EINVAL;
854 if (!dip->i_inode.i_nlink)
855 goto out_gunlock;
856 error = -EFBIG;
857 if (dip->i_entries == (u32)-1)
858 goto out_gunlock;
859 error = -EPERM;
860 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
861 goto out_gunlock;
862 error = -EINVAL;
863 if (!ip->i_inode.i_nlink)
864 goto out_gunlock;
865 error = -EMLINK;
866 if (ip->i_inode.i_nlink == (u32)-1)
867 goto out_gunlock;
868
869 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
870 if (error < 0)
871 goto out_gunlock;
872 error = 0;
873
874 if (alloc_required) {
875 error = gfs2_quota_lock_check(dip);
876 if (error)
877 goto out_gunlock;
878
879 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0);
880 if (error)
881 goto out_gunlock_q;
882
883 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
884 gfs2_rg_blocks(dip, sdp->sd_max_dirres) +
885 2 * RES_DINODE + RES_STATFS +
886 RES_QUOTA, 0);
887 if (error)
888 goto out_ipres;
889 } else {
890 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
891 if (error)
892 goto out_ipres;
893 }
894
895 error = gfs2_meta_inode_buffer(ip, &dibh);
896 if (error)
897 goto out_end_trans;
898
899 error = gfs2_dir_add(dir, &dentry->d_name, ip);
900 if (error)
901 goto out_brelse;
902
903 gfs2_trans_add_meta(ip->i_gl, dibh);
904 inc_nlink(&ip->i_inode);
905 ip->i_inode.i_ctime = CURRENT_TIME;
906 ihold(inode);
907 d_instantiate(dentry, inode);
908 mark_inode_dirty(inode);
909
910 out_brelse:
911 brelse(dibh);
912 out_end_trans:
913 gfs2_trans_end(sdp);
914 out_ipres:
915 if (alloc_required)
916 gfs2_inplace_release(dip);
917 out_gunlock_q:
918 if (alloc_required)
919 gfs2_quota_unlock(dip);
920 out_gunlock:
921 gfs2_glock_dq(ghs + 1);
922 out_child:
923 gfs2_glock_dq(ghs);
924 out_parent:
925 gfs2_holder_uninit(ghs);
926 gfs2_holder_uninit(ghs + 1);
927 return error;
928 }
929
930 /*
931 * gfs2_unlink_ok - check to see that a inode is still in a directory
932 * @dip: the directory
933 * @name: the name of the file
934 * @ip: the inode
935 *
936 * Assumes that the lock on (at least) @dip is held.
937 *
938 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
939 */
940
941 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
942 const struct gfs2_inode *ip)
943 {
944 int error;
945
946 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
947 return -EPERM;
948
949 if ((dip->i_inode.i_mode & S_ISVTX) &&
950 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
951 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
952 return -EPERM;
953
954 if (IS_APPEND(&dip->i_inode))
955 return -EPERM;
956
957 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
958 if (error)
959 return error;
960
961 error = gfs2_dir_check(&dip->i_inode, name, ip);
962 if (error)
963 return error;
964
965 return 0;
966 }
967
968 /**
969 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
970 * @dip: The parent directory
971 * @name: The name of the entry in the parent directory
972 * @inode: The inode to be removed
973 *
974 * Called with all the locks and in a transaction. This will only be
975 * called for a directory after it has been checked to ensure it is empty.
976 *
977 * Returns: 0 on success, or an error
978 */
979
980 static int gfs2_unlink_inode(struct gfs2_inode *dip,
981 const struct dentry *dentry)
982 {
983 struct inode *inode = dentry->d_inode;
984 struct gfs2_inode *ip = GFS2_I(inode);
985 int error;
986
987 error = gfs2_dir_del(dip, dentry);
988 if (error)
989 return error;
990
991 ip->i_entries = 0;
992 inode->i_ctime = CURRENT_TIME;
993 if (S_ISDIR(inode->i_mode))
994 clear_nlink(inode);
995 else
996 drop_nlink(inode);
997 mark_inode_dirty(inode);
998 if (inode->i_nlink == 0)
999 gfs2_unlink_di(inode);
1000 return 0;
1001 }
1002
1003
1004 /**
1005 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1006 * @dir: The inode of the directory containing the inode to unlink
1007 * @dentry: The file itself
1008 *
1009 * This routine uses the type of the inode as a flag to figure out
1010 * whether this is an unlink or an rmdir.
1011 *
1012 * Returns: errno
1013 */
1014
1015 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1016 {
1017 struct gfs2_inode *dip = GFS2_I(dir);
1018 struct gfs2_sbd *sdp = GFS2_SB(dir);
1019 struct inode *inode = dentry->d_inode;
1020 struct gfs2_inode *ip = GFS2_I(inode);
1021 struct gfs2_holder ghs[3];
1022 struct gfs2_rgrpd *rgd;
1023 int error;
1024
1025 error = gfs2_rindex_update(sdp);
1026 if (error)
1027 return error;
1028
1029 error = -EROFS;
1030
1031 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1032 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1033
1034 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1035 if (!rgd)
1036 goto out_inodes;
1037
1038 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1039
1040
1041 error = gfs2_glock_nq(ghs); /* parent */
1042 if (error)
1043 goto out_parent;
1044
1045 error = gfs2_glock_nq(ghs + 1); /* child */
1046 if (error)
1047 goto out_child;
1048
1049 error = -ENOENT;
1050 if (inode->i_nlink == 0)
1051 goto out_rgrp;
1052
1053 if (S_ISDIR(inode->i_mode)) {
1054 error = -ENOTEMPTY;
1055 if (ip->i_entries > 2 || inode->i_nlink > 2)
1056 goto out_rgrp;
1057 }
1058
1059 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1060 if (error)
1061 goto out_rgrp;
1062
1063 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1064 if (error)
1065 goto out_gunlock;
1066
1067 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1068 if (error)
1069 goto out_end_trans;
1070
1071 error = gfs2_unlink_inode(dip, dentry);
1072
1073 out_end_trans:
1074 gfs2_trans_end(sdp);
1075 out_gunlock:
1076 gfs2_glock_dq(ghs + 2);
1077 out_rgrp:
1078 gfs2_glock_dq(ghs + 1);
1079 out_child:
1080 gfs2_glock_dq(ghs);
1081 out_parent:
1082 gfs2_holder_uninit(ghs + 2);
1083 out_inodes:
1084 gfs2_holder_uninit(ghs + 1);
1085 gfs2_holder_uninit(ghs);
1086 return error;
1087 }
1088
1089 /**
1090 * gfs2_symlink - Create a symlink
1091 * @dir: The directory to create the symlink in
1092 * @dentry: The dentry to put the symlink in
1093 * @symname: The thing which the link points to
1094 *
1095 * Returns: errno
1096 */
1097
1098 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1099 const char *symname)
1100 {
1101 struct gfs2_sbd *sdp = GFS2_SB(dir);
1102 unsigned int size;
1103
1104 size = strlen(symname);
1105 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1106 return -ENAMETOOLONG;
1107
1108 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1109 }
1110
1111 /**
1112 * gfs2_mkdir - Make a directory
1113 * @dir: The parent directory of the new one
1114 * @dentry: The dentry of the new directory
1115 * @mode: The mode of the new directory
1116 *
1117 * Returns: errno
1118 */
1119
1120 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1121 {
1122 struct gfs2_sbd *sdp = GFS2_SB(dir);
1123 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1124 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1125 }
1126
1127 /**
1128 * gfs2_mknod - Make a special file
1129 * @dir: The directory in which the special file will reside
1130 * @dentry: The dentry of the special file
1131 * @mode: The mode of the special file
1132 * @dev: The device specification of the special file
1133 *
1134 */
1135
1136 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1137 dev_t dev)
1138 {
1139 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1140 }
1141
1142 /**
1143 * gfs2_atomic_open - Atomically open a file
1144 * @dir: The directory
1145 * @dentry: The proposed new entry
1146 * @file: The proposed new struct file
1147 * @flags: open flags
1148 * @mode: File mode
1149 * @opened: Flag to say whether the file has been opened or not
1150 *
1151 * Returns: error code or 0 for success
1152 */
1153
1154 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1155 struct file *file, unsigned flags,
1156 umode_t mode, int *opened)
1157 {
1158 struct dentry *d;
1159 bool excl = !!(flags & O_EXCL);
1160
1161 d = __gfs2_lookup(dir, dentry, file, opened);
1162 if (IS_ERR(d))
1163 return PTR_ERR(d);
1164 if (d == NULL)
1165 d = dentry;
1166 if (d->d_inode) {
1167 if (!(*opened & FILE_OPENED))
1168 return finish_no_open(file, d);
1169 return 0;
1170 }
1171
1172 if (!(flags & O_CREAT))
1173 return -ENOENT;
1174
1175 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1176 }
1177
1178 /*
1179 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1180 * @this: move this
1181 * @to: to here
1182 *
1183 * Follow @to back to the root and make sure we don't encounter @this
1184 * Assumes we already hold the rename lock.
1185 *
1186 * Returns: errno
1187 */
1188
1189 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1190 {
1191 struct inode *dir = &to->i_inode;
1192 struct super_block *sb = dir->i_sb;
1193 struct inode *tmp;
1194 int error = 0;
1195
1196 igrab(dir);
1197
1198 for (;;) {
1199 if (dir == &this->i_inode) {
1200 error = -EINVAL;
1201 break;
1202 }
1203 if (dir == sb->s_root->d_inode) {
1204 error = 0;
1205 break;
1206 }
1207
1208 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1209 if (IS_ERR(tmp)) {
1210 error = PTR_ERR(tmp);
1211 break;
1212 }
1213
1214 iput(dir);
1215 dir = tmp;
1216 }
1217
1218 iput(dir);
1219
1220 return error;
1221 }
1222
1223 /**
1224 * gfs2_rename - Rename a file
1225 * @odir: Parent directory of old file name
1226 * @odentry: The old dentry of the file
1227 * @ndir: Parent directory of new file name
1228 * @ndentry: The new dentry of the file
1229 *
1230 * Returns: errno
1231 */
1232
1233 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1234 struct inode *ndir, struct dentry *ndentry)
1235 {
1236 struct gfs2_inode *odip = GFS2_I(odir);
1237 struct gfs2_inode *ndip = GFS2_I(ndir);
1238 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1239 struct gfs2_inode *nip = NULL;
1240 struct gfs2_sbd *sdp = GFS2_SB(odir);
1241 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1242 struct gfs2_rgrpd *nrgd;
1243 unsigned int num_gh;
1244 int dir_rename = 0;
1245 int alloc_required = 0;
1246 unsigned int x;
1247 int error;
1248
1249 if (ndentry->d_inode) {
1250 nip = GFS2_I(ndentry->d_inode);
1251 if (ip == nip)
1252 return 0;
1253 }
1254
1255 error = gfs2_rindex_update(sdp);
1256 if (error)
1257 return error;
1258
1259 error = gfs2_rs_alloc(ndip);
1260 if (error)
1261 return error;
1262
1263 if (odip != ndip) {
1264 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1265 0, &r_gh);
1266 if (error)
1267 goto out;
1268
1269 if (S_ISDIR(ip->i_inode.i_mode)) {
1270 dir_rename = 1;
1271 /* don't move a dirctory into it's subdir */
1272 error = gfs2_ok_to_move(ip, ndip);
1273 if (error)
1274 goto out_gunlock_r;
1275 }
1276 }
1277
1278 num_gh = 1;
1279 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1280 if (odip != ndip) {
1281 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1282 num_gh++;
1283 }
1284 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1285 num_gh++;
1286
1287 if (nip) {
1288 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1289 num_gh++;
1290 /* grab the resource lock for unlink flag twiddling
1291 * this is the case of the target file already existing
1292 * so we unlink before doing the rename
1293 */
1294 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1295 if (nrgd)
1296 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1297 }
1298
1299 for (x = 0; x < num_gh; x++) {
1300 error = gfs2_glock_nq(ghs + x);
1301 if (error)
1302 goto out_gunlock;
1303 }
1304
1305 error = -ENOENT;
1306 if (ip->i_inode.i_nlink == 0)
1307 goto out_gunlock;
1308
1309 /* Check out the old directory */
1310
1311 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1312 if (error)
1313 goto out_gunlock;
1314
1315 /* Check out the new directory */
1316
1317 if (nip) {
1318 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1319 if (error)
1320 goto out_gunlock;
1321
1322 if (nip->i_inode.i_nlink == 0) {
1323 error = -EAGAIN;
1324 goto out_gunlock;
1325 }
1326
1327 if (S_ISDIR(nip->i_inode.i_mode)) {
1328 if (nip->i_entries < 2) {
1329 gfs2_consist_inode(nip);
1330 error = -EIO;
1331 goto out_gunlock;
1332 }
1333 if (nip->i_entries > 2) {
1334 error = -ENOTEMPTY;
1335 goto out_gunlock;
1336 }
1337 }
1338 } else {
1339 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1340 if (error)
1341 goto out_gunlock;
1342
1343 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1344 switch (error) {
1345 case -ENOENT:
1346 error = 0;
1347 break;
1348 case 0:
1349 error = -EEXIST;
1350 default:
1351 goto out_gunlock;
1352 };
1353
1354 if (odip != ndip) {
1355 if (!ndip->i_inode.i_nlink) {
1356 error = -ENOENT;
1357 goto out_gunlock;
1358 }
1359 if (ndip->i_entries == (u32)-1) {
1360 error = -EFBIG;
1361 goto out_gunlock;
1362 }
1363 if (S_ISDIR(ip->i_inode.i_mode) &&
1364 ndip->i_inode.i_nlink == (u32)-1) {
1365 error = -EMLINK;
1366 goto out_gunlock;
1367 }
1368 }
1369 }
1370
1371 /* Check out the dir to be renamed */
1372
1373 if (dir_rename) {
1374 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1375 if (error)
1376 goto out_gunlock;
1377 }
1378
1379 if (nip == NULL)
1380 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1381 error = alloc_required;
1382 if (error < 0)
1383 goto out_gunlock;
1384
1385 if (alloc_required) {
1386 error = gfs2_quota_lock_check(ndip);
1387 if (error)
1388 goto out_gunlock;
1389
1390 error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres, 0);
1391 if (error)
1392 goto out_gunlock_q;
1393
1394 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1395 gfs2_rg_blocks(ndip, sdp->sd_max_dirres) +
1396 4 * RES_DINODE + 4 * RES_LEAF +
1397 RES_STATFS + RES_QUOTA + 4, 0);
1398 if (error)
1399 goto out_ipreserv;
1400 } else {
1401 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1402 5 * RES_LEAF + 4, 0);
1403 if (error)
1404 goto out_gunlock;
1405 }
1406
1407 /* Remove the target file, if it exists */
1408
1409 if (nip)
1410 error = gfs2_unlink_inode(ndip, ndentry);
1411
1412 if (dir_rename) {
1413 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1414 if (error)
1415 goto out_end_trans;
1416 } else {
1417 struct buffer_head *dibh;
1418 error = gfs2_meta_inode_buffer(ip, &dibh);
1419 if (error)
1420 goto out_end_trans;
1421 ip->i_inode.i_ctime = CURRENT_TIME;
1422 gfs2_trans_add_meta(ip->i_gl, dibh);
1423 gfs2_dinode_out(ip, dibh->b_data);
1424 brelse(dibh);
1425 }
1426
1427 error = gfs2_dir_del(odip, odentry);
1428 if (error)
1429 goto out_end_trans;
1430
1431 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1432 if (error)
1433 goto out_end_trans;
1434
1435 out_end_trans:
1436 gfs2_trans_end(sdp);
1437 out_ipreserv:
1438 if (alloc_required)
1439 gfs2_inplace_release(ndip);
1440 out_gunlock_q:
1441 if (alloc_required)
1442 gfs2_quota_unlock(ndip);
1443 out_gunlock:
1444 while (x--) {
1445 gfs2_glock_dq(ghs + x);
1446 gfs2_holder_uninit(ghs + x);
1447 }
1448 out_gunlock_r:
1449 if (r_gh.gh_gl)
1450 gfs2_glock_dq_uninit(&r_gh);
1451 out:
1452 return error;
1453 }
1454
1455 /**
1456 * gfs2_follow_link - Follow a symbolic link
1457 * @dentry: The dentry of the link
1458 * @nd: Data that we pass to vfs_follow_link()
1459 *
1460 * This can handle symlinks of any size.
1461 *
1462 * Returns: 0 on success or error code
1463 */
1464
1465 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1466 {
1467 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1468 struct gfs2_holder i_gh;
1469 struct buffer_head *dibh;
1470 unsigned int size;
1471 char *buf;
1472 int error;
1473
1474 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1475 error = gfs2_glock_nq(&i_gh);
1476 if (error) {
1477 gfs2_holder_uninit(&i_gh);
1478 nd_set_link(nd, ERR_PTR(error));
1479 return NULL;
1480 }
1481
1482 size = (unsigned int)i_size_read(&ip->i_inode);
1483 if (size == 0) {
1484 gfs2_consist_inode(ip);
1485 buf = ERR_PTR(-EIO);
1486 goto out;
1487 }
1488
1489 error = gfs2_meta_inode_buffer(ip, &dibh);
1490 if (error) {
1491 buf = ERR_PTR(error);
1492 goto out;
1493 }
1494
1495 buf = kzalloc(size + 1, GFP_NOFS);
1496 if (!buf)
1497 buf = ERR_PTR(-ENOMEM);
1498 else
1499 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1500 brelse(dibh);
1501 out:
1502 gfs2_glock_dq_uninit(&i_gh);
1503 nd_set_link(nd, buf);
1504 return NULL;
1505 }
1506
1507 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1508 {
1509 char *s = nd_get_link(nd);
1510 if (!IS_ERR(s))
1511 kfree(s);
1512 }
1513
1514 /**
1515 * gfs2_permission -
1516 * @inode: The inode
1517 * @mask: The mask to be tested
1518 * @flags: Indicates whether this is an RCU path walk or not
1519 *
1520 * This may be called from the VFS directly, or from within GFS2 with the
1521 * inode locked, so we look to see if the glock is already locked and only
1522 * lock the glock if its not already been done.
1523 *
1524 * Returns: errno
1525 */
1526
1527 int gfs2_permission(struct inode *inode, int mask)
1528 {
1529 struct gfs2_inode *ip;
1530 struct gfs2_holder i_gh;
1531 int error;
1532 int unlock = 0;
1533
1534
1535 ip = GFS2_I(inode);
1536 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1537 if (mask & MAY_NOT_BLOCK)
1538 return -ECHILD;
1539 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1540 if (error)
1541 return error;
1542 unlock = 1;
1543 }
1544
1545 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1546 error = -EACCES;
1547 else
1548 error = generic_permission(inode, mask);
1549 if (unlock)
1550 gfs2_glock_dq_uninit(&i_gh);
1551
1552 return error;
1553 }
1554
1555 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1556 {
1557 setattr_copy(inode, attr);
1558 mark_inode_dirty(inode);
1559 return 0;
1560 }
1561
1562 /**
1563 * gfs2_setattr_simple -
1564 * @ip:
1565 * @attr:
1566 *
1567 * Returns: errno
1568 */
1569
1570 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1571 {
1572 int error;
1573
1574 if (current->journal_info)
1575 return __gfs2_setattr_simple(inode, attr);
1576
1577 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1578 if (error)
1579 return error;
1580
1581 error = __gfs2_setattr_simple(inode, attr);
1582 gfs2_trans_end(GFS2_SB(inode));
1583 return error;
1584 }
1585
1586 static int setattr_chown(struct inode *inode, struct iattr *attr)
1587 {
1588 struct gfs2_inode *ip = GFS2_I(inode);
1589 struct gfs2_sbd *sdp = GFS2_SB(inode);
1590 kuid_t ouid, nuid;
1591 kgid_t ogid, ngid;
1592 int error;
1593
1594 ouid = inode->i_uid;
1595 ogid = inode->i_gid;
1596 nuid = attr->ia_uid;
1597 ngid = attr->ia_gid;
1598
1599 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1600 ouid = nuid = NO_UID_QUOTA_CHANGE;
1601 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1602 ogid = ngid = NO_GID_QUOTA_CHANGE;
1603
1604 error = gfs2_quota_lock(ip, nuid, ngid);
1605 if (error)
1606 return error;
1607
1608 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1609 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1610 error = gfs2_quota_check(ip, nuid, ngid);
1611 if (error)
1612 goto out_gunlock_q;
1613 }
1614
1615 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1616 if (error)
1617 goto out_gunlock_q;
1618
1619 error = gfs2_setattr_simple(inode, attr);
1620 if (error)
1621 goto out_end_trans;
1622
1623 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1624 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1625 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1626 gfs2_quota_change(ip, -blocks, ouid, ogid);
1627 gfs2_quota_change(ip, blocks, nuid, ngid);
1628 }
1629
1630 out_end_trans:
1631 gfs2_trans_end(sdp);
1632 out_gunlock_q:
1633 gfs2_quota_unlock(ip);
1634 return error;
1635 }
1636
1637 /**
1638 * gfs2_setattr - Change attributes on an inode
1639 * @dentry: The dentry which is changing
1640 * @attr: The structure describing the change
1641 *
1642 * The VFS layer wants to change one or more of an inodes attributes. Write
1643 * that change out to disk.
1644 *
1645 * Returns: errno
1646 */
1647
1648 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1649 {
1650 struct inode *inode = dentry->d_inode;
1651 struct gfs2_inode *ip = GFS2_I(inode);
1652 struct gfs2_holder i_gh;
1653 int error;
1654
1655 error = gfs2_rs_alloc(ip);
1656 if (error)
1657 return error;
1658
1659 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1660 if (error)
1661 return error;
1662
1663 error = -EPERM;
1664 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1665 goto out;
1666
1667 error = inode_change_ok(inode, attr);
1668 if (error)
1669 goto out;
1670
1671 if (attr->ia_valid & ATTR_SIZE)
1672 error = gfs2_setattr_size(inode, attr->ia_size);
1673 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1674 error = setattr_chown(inode, attr);
1675 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1676 error = gfs2_acl_chmod(ip, attr);
1677 else
1678 error = gfs2_setattr_simple(inode, attr);
1679
1680 out:
1681 if (!error)
1682 mark_inode_dirty(inode);
1683 gfs2_glock_dq_uninit(&i_gh);
1684 return error;
1685 }
1686
1687 /**
1688 * gfs2_getattr - Read out an inode's attributes
1689 * @mnt: The vfsmount the inode is being accessed from
1690 * @dentry: The dentry to stat
1691 * @stat: The inode's stats
1692 *
1693 * This may be called from the VFS directly, or from within GFS2 with the
1694 * inode locked, so we look to see if the glock is already locked and only
1695 * lock the glock if its not already been done. Note that its the NFS
1696 * readdirplus operation which causes this to be called (from filldir)
1697 * with the glock already held.
1698 *
1699 * Returns: errno
1700 */
1701
1702 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1703 struct kstat *stat)
1704 {
1705 struct inode *inode = dentry->d_inode;
1706 struct gfs2_inode *ip = GFS2_I(inode);
1707 struct gfs2_holder gh;
1708 int error;
1709 int unlock = 0;
1710
1711 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1712 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1713 if (error)
1714 return error;
1715 unlock = 1;
1716 }
1717
1718 generic_fillattr(inode, stat);
1719 if (unlock)
1720 gfs2_glock_dq_uninit(&gh);
1721
1722 return 0;
1723 }
1724
1725 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1726 const void *data, size_t size, int flags)
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_EXCLUSIVE, 0, &gh);
1734 ret = gfs2_glock_nq(&gh);
1735 if (ret == 0) {
1736 ret = gfs2_rs_alloc(ip);
1737 if (ret == 0)
1738 ret = generic_setxattr(dentry, name, data, size, flags);
1739 gfs2_glock_dq(&gh);
1740 }
1741 gfs2_holder_uninit(&gh);
1742 return ret;
1743 }
1744
1745 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1746 void *data, size_t size)
1747 {
1748 struct inode *inode = dentry->d_inode;
1749 struct gfs2_inode *ip = GFS2_I(inode);
1750 struct gfs2_holder gh;
1751 int ret;
1752
1753 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1754 ret = gfs2_glock_nq(&gh);
1755 if (ret == 0) {
1756 ret = generic_getxattr(dentry, name, data, size);
1757 gfs2_glock_dq(&gh);
1758 }
1759 gfs2_holder_uninit(&gh);
1760 return ret;
1761 }
1762
1763 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1764 {
1765 struct inode *inode = dentry->d_inode;
1766 struct gfs2_inode *ip = GFS2_I(inode);
1767 struct gfs2_holder gh;
1768 int ret;
1769
1770 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1771 ret = gfs2_glock_nq(&gh);
1772 if (ret == 0) {
1773 ret = gfs2_rs_alloc(ip);
1774 if (ret == 0)
1775 ret = generic_removexattr(dentry, name);
1776 gfs2_glock_dq(&gh);
1777 }
1778 gfs2_holder_uninit(&gh);
1779 return ret;
1780 }
1781
1782 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1783 u64 start, u64 len)
1784 {
1785 struct gfs2_inode *ip = GFS2_I(inode);
1786 struct gfs2_holder gh;
1787 int ret;
1788
1789 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1790 if (ret)
1791 return ret;
1792
1793 mutex_lock(&inode->i_mutex);
1794
1795 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1796 if (ret)
1797 goto out;
1798
1799 if (gfs2_is_stuffed(ip)) {
1800 u64 phys = ip->i_no_addr << inode->i_blkbits;
1801 u64 size = i_size_read(inode);
1802 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1803 FIEMAP_EXTENT_DATA_INLINE;
1804 phys += sizeof(struct gfs2_dinode);
1805 phys += start;
1806 if (start + len > size)
1807 len = size - start;
1808 if (start < size)
1809 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1810 len, flags);
1811 if (ret == 1)
1812 ret = 0;
1813 } else {
1814 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1815 gfs2_block_map);
1816 }
1817
1818 gfs2_glock_dq_uninit(&gh);
1819 out:
1820 mutex_unlock(&inode->i_mutex);
1821 return ret;
1822 }
1823
1824 const struct inode_operations gfs2_file_iops = {
1825 .permission = gfs2_permission,
1826 .setattr = gfs2_setattr,
1827 .getattr = gfs2_getattr,
1828 .setxattr = gfs2_setxattr,
1829 .getxattr = gfs2_getxattr,
1830 .listxattr = gfs2_listxattr,
1831 .removexattr = gfs2_removexattr,
1832 .fiemap = gfs2_fiemap,
1833 .get_acl = gfs2_get_acl,
1834 };
1835
1836 const struct inode_operations gfs2_dir_iops = {
1837 .create = gfs2_create,
1838 .lookup = gfs2_lookup,
1839 .link = gfs2_link,
1840 .unlink = gfs2_unlink,
1841 .symlink = gfs2_symlink,
1842 .mkdir = gfs2_mkdir,
1843 .rmdir = gfs2_unlink,
1844 .mknod = gfs2_mknod,
1845 .rename = gfs2_rename,
1846 .permission = gfs2_permission,
1847 .setattr = gfs2_setattr,
1848 .getattr = gfs2_getattr,
1849 .setxattr = gfs2_setxattr,
1850 .getxattr = gfs2_getxattr,
1851 .listxattr = gfs2_listxattr,
1852 .removexattr = gfs2_removexattr,
1853 .fiemap = gfs2_fiemap,
1854 .get_acl = gfs2_get_acl,
1855 .atomic_open = gfs2_atomic_open,
1856 };
1857
1858 const struct inode_operations gfs2_symlink_iops = {
1859 .readlink = generic_readlink,
1860 .follow_link = gfs2_follow_link,
1861 .put_link = gfs2_put_link,
1862 .permission = gfs2_permission,
1863 .setattr = gfs2_setattr,
1864 .getattr = gfs2_getattr,
1865 .setxattr = gfs2_setxattr,
1866 .getxattr = gfs2_getxattr,
1867 .listxattr = gfs2_listxattr,
1868 .removexattr = gfs2_removexattr,
1869 .fiemap = gfs2_fiemap,
1870 .get_acl = gfs2_get_acl,
1871 };
1872
Linux kernel - Deliverables
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