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GFS2: Clean up reservation removal
[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) {
588 if (S_ISREG(inode->i_mode)) {
589 WARN_ON(d != NULL);
590 error = finish_open(file, dentry, gfs2_open_common, opened);
591 } else {
592 error = finish_no_open(file, d);
593 }
594 } else {
595 dput(d);
596 }
597 gfs2_glock_dq_uninit(ghs);
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, NULL);
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 dput(d);
784 return ERR_PTR(error);
785 }
786 return d;
787 }
788
789 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
790 unsigned flags)
791 {
792 return __gfs2_lookup(dir, dentry, NULL, NULL);
793 }
794
795 /**
796 * gfs2_link - Link to a file
797 * @old_dentry: The inode to link
798 * @dir: Add link to this directory
799 * @dentry: The name of the link
800 *
801 * Link the inode in "old_dentry" into the directory "dir" with the
802 * name in "dentry".
803 *
804 * Returns: errno
805 */
806
807 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
808 struct dentry *dentry)
809 {
810 struct gfs2_inode *dip = GFS2_I(dir);
811 struct gfs2_sbd *sdp = GFS2_SB(dir);
812 struct inode *inode = old_dentry->d_inode;
813 struct gfs2_inode *ip = GFS2_I(inode);
814 struct gfs2_holder ghs[2];
815 struct buffer_head *dibh;
816 int alloc_required;
817 int error;
818
819 if (S_ISDIR(inode->i_mode))
820 return -EPERM;
821
822 error = gfs2_rs_alloc(dip);
823 if (error)
824 return error;
825
826 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
827 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
828
829 error = gfs2_glock_nq(ghs); /* parent */
830 if (error)
831 goto out_parent;
832
833 error = gfs2_glock_nq(ghs + 1); /* child */
834 if (error)
835 goto out_child;
836
837 error = -ENOENT;
838 if (inode->i_nlink == 0)
839 goto out_gunlock;
840
841 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
842 if (error)
843 goto out_gunlock;
844
845 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
846 switch (error) {
847 case -ENOENT:
848 break;
849 case 0:
850 error = -EEXIST;
851 default:
852 goto out_gunlock;
853 }
854
855 error = -EINVAL;
856 if (!dip->i_inode.i_nlink)
857 goto out_gunlock;
858 error = -EFBIG;
859 if (dip->i_entries == (u32)-1)
860 goto out_gunlock;
861 error = -EPERM;
862 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
863 goto out_gunlock;
864 error = -EINVAL;
865 if (!ip->i_inode.i_nlink)
866 goto out_gunlock;
867 error = -EMLINK;
868 if (ip->i_inode.i_nlink == (u32)-1)
869 goto out_gunlock;
870
871 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
872 if (error < 0)
873 goto out_gunlock;
874 error = 0;
875
876 if (alloc_required) {
877 error = gfs2_quota_lock_check(dip);
878 if (error)
879 goto out_gunlock;
880
881 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0);
882 if (error)
883 goto out_gunlock_q;
884
885 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
886 gfs2_rg_blocks(dip, sdp->sd_max_dirres) +
887 2 * RES_DINODE + RES_STATFS +
888 RES_QUOTA, 0);
889 if (error)
890 goto out_ipres;
891 } else {
892 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
893 if (error)
894 goto out_ipres;
895 }
896
897 error = gfs2_meta_inode_buffer(ip, &dibh);
898 if (error)
899 goto out_end_trans;
900
901 error = gfs2_dir_add(dir, &dentry->d_name, ip);
902 if (error)
903 goto out_brelse;
904
905 gfs2_trans_add_meta(ip->i_gl, dibh);
906 inc_nlink(&ip->i_inode);
907 ip->i_inode.i_ctime = CURRENT_TIME;
908 ihold(inode);
909 d_instantiate(dentry, inode);
910 mark_inode_dirty(inode);
911
912 out_brelse:
913 brelse(dibh);
914 out_end_trans:
915 gfs2_trans_end(sdp);
916 out_ipres:
917 if (alloc_required)
918 gfs2_inplace_release(dip);
919 out_gunlock_q:
920 if (alloc_required)
921 gfs2_quota_unlock(dip);
922 out_gunlock:
923 gfs2_glock_dq(ghs + 1);
924 out_child:
925 gfs2_glock_dq(ghs);
926 out_parent:
927 gfs2_holder_uninit(ghs);
928 gfs2_holder_uninit(ghs + 1);
929 return error;
930 }
931
932 /*
933 * gfs2_unlink_ok - check to see that a inode is still in a directory
934 * @dip: the directory
935 * @name: the name of the file
936 * @ip: the inode
937 *
938 * Assumes that the lock on (at least) @dip is held.
939 *
940 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
941 */
942
943 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
944 const struct gfs2_inode *ip)
945 {
946 int error;
947
948 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
949 return -EPERM;
950
951 if ((dip->i_inode.i_mode & S_ISVTX) &&
952 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
953 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
954 return -EPERM;
955
956 if (IS_APPEND(&dip->i_inode))
957 return -EPERM;
958
959 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
960 if (error)
961 return error;
962
963 error = gfs2_dir_check(&dip->i_inode, name, ip);
964 if (error)
965 return error;
966
967 return 0;
968 }
969
970 /**
971 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
972 * @dip: The parent directory
973 * @name: The name of the entry in the parent directory
974 * @inode: The inode to be removed
975 *
976 * Called with all the locks and in a transaction. This will only be
977 * called for a directory after it has been checked to ensure it is empty.
978 *
979 * Returns: 0 on success, or an error
980 */
981
982 static int gfs2_unlink_inode(struct gfs2_inode *dip,
983 const struct dentry *dentry)
984 {
985 struct inode *inode = dentry->d_inode;
986 struct gfs2_inode *ip = GFS2_I(inode);
987 int error;
988
989 error = gfs2_dir_del(dip, dentry);
990 if (error)
991 return error;
992
993 ip->i_entries = 0;
994 inode->i_ctime = CURRENT_TIME;
995 if (S_ISDIR(inode->i_mode))
996 clear_nlink(inode);
997 else
998 drop_nlink(inode);
999 mark_inode_dirty(inode);
1000 if (inode->i_nlink == 0)
1001 gfs2_unlink_di(inode);
1002 return 0;
1003 }
1004
1005
1006 /**
1007 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1008 * @dir: The inode of the directory containing the inode to unlink
1009 * @dentry: The file itself
1010 *
1011 * This routine uses the type of the inode as a flag to figure out
1012 * whether this is an unlink or an rmdir.
1013 *
1014 * Returns: errno
1015 */
1016
1017 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1018 {
1019 struct gfs2_inode *dip = GFS2_I(dir);
1020 struct gfs2_sbd *sdp = GFS2_SB(dir);
1021 struct inode *inode = dentry->d_inode;
1022 struct gfs2_inode *ip = GFS2_I(inode);
1023 struct gfs2_holder ghs[3];
1024 struct gfs2_rgrpd *rgd;
1025 int error;
1026
1027 error = gfs2_rindex_update(sdp);
1028 if (error)
1029 return error;
1030
1031 error = -EROFS;
1032
1033 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1034 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1035
1036 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1037 if (!rgd)
1038 goto out_inodes;
1039
1040 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1041
1042
1043 error = gfs2_glock_nq(ghs); /* parent */
1044 if (error)
1045 goto out_parent;
1046
1047 error = gfs2_glock_nq(ghs + 1); /* child */
1048 if (error)
1049 goto out_child;
1050
1051 error = -ENOENT;
1052 if (inode->i_nlink == 0)
1053 goto out_rgrp;
1054
1055 if (S_ISDIR(inode->i_mode)) {
1056 error = -ENOTEMPTY;
1057 if (ip->i_entries > 2 || inode->i_nlink > 2)
1058 goto out_rgrp;
1059 }
1060
1061 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1062 if (error)
1063 goto out_rgrp;
1064
1065 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1066 if (error)
1067 goto out_gunlock;
1068
1069 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1070 if (error)
1071 goto out_end_trans;
1072
1073 error = gfs2_unlink_inode(dip, dentry);
1074
1075 out_end_trans:
1076 gfs2_trans_end(sdp);
1077 out_gunlock:
1078 gfs2_glock_dq(ghs + 2);
1079 out_rgrp:
1080 gfs2_glock_dq(ghs + 1);
1081 out_child:
1082 gfs2_glock_dq(ghs);
1083 out_parent:
1084 gfs2_holder_uninit(ghs + 2);
1085 out_inodes:
1086 gfs2_holder_uninit(ghs + 1);
1087 gfs2_holder_uninit(ghs);
1088 return error;
1089 }
1090
1091 /**
1092 * gfs2_symlink - Create a symlink
1093 * @dir: The directory to create the symlink in
1094 * @dentry: The dentry to put the symlink in
1095 * @symname: The thing which the link points to
1096 *
1097 * Returns: errno
1098 */
1099
1100 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1101 const char *symname)
1102 {
1103 struct gfs2_sbd *sdp = GFS2_SB(dir);
1104 unsigned int size;
1105
1106 size = strlen(symname);
1107 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1108 return -ENAMETOOLONG;
1109
1110 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1111 }
1112
1113 /**
1114 * gfs2_mkdir - Make a directory
1115 * @dir: The parent directory of the new one
1116 * @dentry: The dentry of the new directory
1117 * @mode: The mode of the new directory
1118 *
1119 * Returns: errno
1120 */
1121
1122 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1123 {
1124 struct gfs2_sbd *sdp = GFS2_SB(dir);
1125 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1126 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1127 }
1128
1129 /**
1130 * gfs2_mknod - Make a special file
1131 * @dir: The directory in which the special file will reside
1132 * @dentry: The dentry of the special file
1133 * @mode: The mode of the special file
1134 * @dev: The device specification of the special file
1135 *
1136 */
1137
1138 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1139 dev_t dev)
1140 {
1141 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1142 }
1143
1144 /**
1145 * gfs2_atomic_open - Atomically open a file
1146 * @dir: The directory
1147 * @dentry: The proposed new entry
1148 * @file: The proposed new struct file
1149 * @flags: open flags
1150 * @mode: File mode
1151 * @opened: Flag to say whether the file has been opened or not
1152 *
1153 * Returns: error code or 0 for success
1154 */
1155
1156 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1157 struct file *file, unsigned flags,
1158 umode_t mode, int *opened)
1159 {
1160 struct dentry *d;
1161 bool excl = !!(flags & O_EXCL);
1162
1163 d = __gfs2_lookup(dir, dentry, file, opened);
1164 if (IS_ERR(d))
1165 return PTR_ERR(d);
1166 if (d != NULL)
1167 dentry = d;
1168 if (dentry->d_inode) {
1169 if (!(*opened & FILE_OPENED))
1170 return finish_no_open(file, dentry);
1171 dput(d);
1172 return 0;
1173 }
1174
1175 BUG_ON(d != NULL);
1176 if (!(flags & O_CREAT))
1177 return -ENOENT;
1178
1179 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1180 }
1181
1182 /*
1183 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1184 * @this: move this
1185 * @to: to here
1186 *
1187 * Follow @to back to the root and make sure we don't encounter @this
1188 * Assumes we already hold the rename lock.
1189 *
1190 * Returns: errno
1191 */
1192
1193 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1194 {
1195 struct inode *dir = &to->i_inode;
1196 struct super_block *sb = dir->i_sb;
1197 struct inode *tmp;
1198 int error = 0;
1199
1200 igrab(dir);
1201
1202 for (;;) {
1203 if (dir == &this->i_inode) {
1204 error = -EINVAL;
1205 break;
1206 }
1207 if (dir == sb->s_root->d_inode) {
1208 error = 0;
1209 break;
1210 }
1211
1212 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1213 if (IS_ERR(tmp)) {
1214 error = PTR_ERR(tmp);
1215 break;
1216 }
1217
1218 iput(dir);
1219 dir = tmp;
1220 }
1221
1222 iput(dir);
1223
1224 return error;
1225 }
1226
1227 /**
1228 * gfs2_rename - Rename a file
1229 * @odir: Parent directory of old file name
1230 * @odentry: The old dentry of the file
1231 * @ndir: Parent directory of new file name
1232 * @ndentry: The new dentry of the file
1233 *
1234 * Returns: errno
1235 */
1236
1237 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1238 struct inode *ndir, struct dentry *ndentry)
1239 {
1240 struct gfs2_inode *odip = GFS2_I(odir);
1241 struct gfs2_inode *ndip = GFS2_I(ndir);
1242 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1243 struct gfs2_inode *nip = NULL;
1244 struct gfs2_sbd *sdp = GFS2_SB(odir);
1245 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1246 struct gfs2_rgrpd *nrgd;
1247 unsigned int num_gh;
1248 int dir_rename = 0;
1249 int alloc_required = 0;
1250 unsigned int x;
1251 int error;
1252
1253 if (ndentry->d_inode) {
1254 nip = GFS2_I(ndentry->d_inode);
1255 if (ip == nip)
1256 return 0;
1257 }
1258
1259 error = gfs2_rindex_update(sdp);
1260 if (error)
1261 return error;
1262
1263 error = gfs2_rs_alloc(ndip);
1264 if (error)
1265 return error;
1266
1267 if (odip != ndip) {
1268 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1269 0, &r_gh);
1270 if (error)
1271 goto out;
1272
1273 if (S_ISDIR(ip->i_inode.i_mode)) {
1274 dir_rename = 1;
1275 /* don't move a dirctory into it's subdir */
1276 error = gfs2_ok_to_move(ip, ndip);
1277 if (error)
1278 goto out_gunlock_r;
1279 }
1280 }
1281
1282 num_gh = 1;
1283 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1284 if (odip != ndip) {
1285 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1286 num_gh++;
1287 }
1288 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1289 num_gh++;
1290
1291 if (nip) {
1292 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1293 num_gh++;
1294 /* grab the resource lock for unlink flag twiddling
1295 * this is the case of the target file already existing
1296 * so we unlink before doing the rename
1297 */
1298 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1299 if (nrgd)
1300 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1301 }
1302
1303 for (x = 0; x < num_gh; x++) {
1304 error = gfs2_glock_nq(ghs + x);
1305 if (error)
1306 goto out_gunlock;
1307 }
1308
1309 error = -ENOENT;
1310 if (ip->i_inode.i_nlink == 0)
1311 goto out_gunlock;
1312
1313 /* Check out the old directory */
1314
1315 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1316 if (error)
1317 goto out_gunlock;
1318
1319 /* Check out the new directory */
1320
1321 if (nip) {
1322 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1323 if (error)
1324 goto out_gunlock;
1325
1326 if (nip->i_inode.i_nlink == 0) {
1327 error = -EAGAIN;
1328 goto out_gunlock;
1329 }
1330
1331 if (S_ISDIR(nip->i_inode.i_mode)) {
1332 if (nip->i_entries < 2) {
1333 gfs2_consist_inode(nip);
1334 error = -EIO;
1335 goto out_gunlock;
1336 }
1337 if (nip->i_entries > 2) {
1338 error = -ENOTEMPTY;
1339 goto out_gunlock;
1340 }
1341 }
1342 } else {
1343 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1344 if (error)
1345 goto out_gunlock;
1346
1347 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1348 switch (error) {
1349 case -ENOENT:
1350 error = 0;
1351 break;
1352 case 0:
1353 error = -EEXIST;
1354 default:
1355 goto out_gunlock;
1356 };
1357
1358 if (odip != ndip) {
1359 if (!ndip->i_inode.i_nlink) {
1360 error = -ENOENT;
1361 goto out_gunlock;
1362 }
1363 if (ndip->i_entries == (u32)-1) {
1364 error = -EFBIG;
1365 goto out_gunlock;
1366 }
1367 if (S_ISDIR(ip->i_inode.i_mode) &&
1368 ndip->i_inode.i_nlink == (u32)-1) {
1369 error = -EMLINK;
1370 goto out_gunlock;
1371 }
1372 }
1373 }
1374
1375 /* Check out the dir to be renamed */
1376
1377 if (dir_rename) {
1378 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1379 if (error)
1380 goto out_gunlock;
1381 }
1382
1383 if (nip == NULL)
1384 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1385 error = alloc_required;
1386 if (error < 0)
1387 goto out_gunlock;
1388
1389 if (alloc_required) {
1390 error = gfs2_quota_lock_check(ndip);
1391 if (error)
1392 goto out_gunlock;
1393
1394 error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres, 0);
1395 if (error)
1396 goto out_gunlock_q;
1397
1398 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1399 gfs2_rg_blocks(ndip, sdp->sd_max_dirres) +
1400 4 * RES_DINODE + 4 * RES_LEAF +
1401 RES_STATFS + RES_QUOTA + 4, 0);
1402 if (error)
1403 goto out_ipreserv;
1404 } else {
1405 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1406 5 * RES_LEAF + 4, 0);
1407 if (error)
1408 goto out_gunlock;
1409 }
1410
1411 /* Remove the target file, if it exists */
1412
1413 if (nip)
1414 error = gfs2_unlink_inode(ndip, ndentry);
1415
1416 if (dir_rename) {
1417 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1418 if (error)
1419 goto out_end_trans;
1420 } else {
1421 struct buffer_head *dibh;
1422 error = gfs2_meta_inode_buffer(ip, &dibh);
1423 if (error)
1424 goto out_end_trans;
1425 ip->i_inode.i_ctime = CURRENT_TIME;
1426 gfs2_trans_add_meta(ip->i_gl, dibh);
1427 gfs2_dinode_out(ip, dibh->b_data);
1428 brelse(dibh);
1429 }
1430
1431 error = gfs2_dir_del(odip, odentry);
1432 if (error)
1433 goto out_end_trans;
1434
1435 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1436 if (error)
1437 goto out_end_trans;
1438
1439 out_end_trans:
1440 gfs2_trans_end(sdp);
1441 out_ipreserv:
1442 if (alloc_required)
1443 gfs2_inplace_release(ndip);
1444 out_gunlock_q:
1445 if (alloc_required)
1446 gfs2_quota_unlock(ndip);
1447 out_gunlock:
1448 while (x--) {
1449 gfs2_glock_dq(ghs + x);
1450 gfs2_holder_uninit(ghs + x);
1451 }
1452 out_gunlock_r:
1453 if (r_gh.gh_gl)
1454 gfs2_glock_dq_uninit(&r_gh);
1455 out:
1456 return error;
1457 }
1458
1459 /**
1460 * gfs2_follow_link - Follow a symbolic link
1461 * @dentry: The dentry of the link
1462 * @nd: Data that we pass to vfs_follow_link()
1463 *
1464 * This can handle symlinks of any size.
1465 *
1466 * Returns: 0 on success or error code
1467 */
1468
1469 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1470 {
1471 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1472 struct gfs2_holder i_gh;
1473 struct buffer_head *dibh;
1474 unsigned int size;
1475 char *buf;
1476 int error;
1477
1478 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1479 error = gfs2_glock_nq(&i_gh);
1480 if (error) {
1481 gfs2_holder_uninit(&i_gh);
1482 nd_set_link(nd, ERR_PTR(error));
1483 return NULL;
1484 }
1485
1486 size = (unsigned int)i_size_read(&ip->i_inode);
1487 if (size == 0) {
1488 gfs2_consist_inode(ip);
1489 buf = ERR_PTR(-EIO);
1490 goto out;
1491 }
1492
1493 error = gfs2_meta_inode_buffer(ip, &dibh);
1494 if (error) {
1495 buf = ERR_PTR(error);
1496 goto out;
1497 }
1498
1499 buf = kzalloc(size + 1, GFP_NOFS);
1500 if (!buf)
1501 buf = ERR_PTR(-ENOMEM);
1502 else
1503 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1504 brelse(dibh);
1505 out:
1506 gfs2_glock_dq_uninit(&i_gh);
1507 nd_set_link(nd, buf);
1508 return NULL;
1509 }
1510
1511 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1512 {
1513 char *s = nd_get_link(nd);
1514 if (!IS_ERR(s))
1515 kfree(s);
1516 }
1517
1518 /**
1519 * gfs2_permission -
1520 * @inode: The inode
1521 * @mask: The mask to be tested
1522 * @flags: Indicates whether this is an RCU path walk or not
1523 *
1524 * This may be called from the VFS directly, or from within GFS2 with the
1525 * inode locked, so we look to see if the glock is already locked and only
1526 * lock the glock if its not already been done.
1527 *
1528 * Returns: errno
1529 */
1530
1531 int gfs2_permission(struct inode *inode, int mask)
1532 {
1533 struct gfs2_inode *ip;
1534 struct gfs2_holder i_gh;
1535 int error;
1536 int unlock = 0;
1537
1538
1539 ip = GFS2_I(inode);
1540 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1541 if (mask & MAY_NOT_BLOCK)
1542 return -ECHILD;
1543 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1544 if (error)
1545 return error;
1546 unlock = 1;
1547 }
1548
1549 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1550 error = -EACCES;
1551 else
1552 error = generic_permission(inode, mask);
1553 if (unlock)
1554 gfs2_glock_dq_uninit(&i_gh);
1555
1556 return error;
1557 }
1558
1559 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1560 {
1561 setattr_copy(inode, attr);
1562 mark_inode_dirty(inode);
1563 return 0;
1564 }
1565
1566 /**
1567 * gfs2_setattr_simple -
1568 * @ip:
1569 * @attr:
1570 *
1571 * Returns: errno
1572 */
1573
1574 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1575 {
1576 int error;
1577
1578 if (current->journal_info)
1579 return __gfs2_setattr_simple(inode, attr);
1580
1581 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1582 if (error)
1583 return error;
1584
1585 error = __gfs2_setattr_simple(inode, attr);
1586 gfs2_trans_end(GFS2_SB(inode));
1587 return error;
1588 }
1589
1590 static int setattr_chown(struct inode *inode, struct iattr *attr)
1591 {
1592 struct gfs2_inode *ip = GFS2_I(inode);
1593 struct gfs2_sbd *sdp = GFS2_SB(inode);
1594 kuid_t ouid, nuid;
1595 kgid_t ogid, ngid;
1596 int error;
1597
1598 ouid = inode->i_uid;
1599 ogid = inode->i_gid;
1600 nuid = attr->ia_uid;
1601 ngid = attr->ia_gid;
1602
1603 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1604 ouid = nuid = NO_UID_QUOTA_CHANGE;
1605 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1606 ogid = ngid = NO_GID_QUOTA_CHANGE;
1607
1608 error = gfs2_quota_lock(ip, nuid, ngid);
1609 if (error)
1610 return error;
1611
1612 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1613 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1614 error = gfs2_quota_check(ip, nuid, ngid);
1615 if (error)
1616 goto out_gunlock_q;
1617 }
1618
1619 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1620 if (error)
1621 goto out_gunlock_q;
1622
1623 error = gfs2_setattr_simple(inode, attr);
1624 if (error)
1625 goto out_end_trans;
1626
1627 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1628 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1629 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1630 gfs2_quota_change(ip, -blocks, ouid, ogid);
1631 gfs2_quota_change(ip, blocks, nuid, ngid);
1632 }
1633
1634 out_end_trans:
1635 gfs2_trans_end(sdp);
1636 out_gunlock_q:
1637 gfs2_quota_unlock(ip);
1638 return error;
1639 }
1640
1641 /**
1642 * gfs2_setattr - Change attributes on an inode
1643 * @dentry: The dentry which is changing
1644 * @attr: The structure describing the change
1645 *
1646 * The VFS layer wants to change one or more of an inodes attributes. Write
1647 * that change out to disk.
1648 *
1649 * Returns: errno
1650 */
1651
1652 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1653 {
1654 struct inode *inode = dentry->d_inode;
1655 struct gfs2_inode *ip = GFS2_I(inode);
1656 struct gfs2_holder i_gh;
1657 int error;
1658
1659 error = gfs2_rs_alloc(ip);
1660 if (error)
1661 return error;
1662
1663 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1664 if (error)
1665 return error;
1666
1667 error = -EPERM;
1668 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1669 goto out;
1670
1671 error = inode_change_ok(inode, attr);
1672 if (error)
1673 goto out;
1674
1675 if (attr->ia_valid & ATTR_SIZE)
1676 error = gfs2_setattr_size(inode, attr->ia_size);
1677 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1678 error = setattr_chown(inode, attr);
1679 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1680 error = gfs2_acl_chmod(ip, attr);
1681 else
1682 error = gfs2_setattr_simple(inode, attr);
1683
1684 out:
1685 if (!error)
1686 mark_inode_dirty(inode);
1687 gfs2_glock_dq_uninit(&i_gh);
1688 return error;
1689 }
1690
1691 /**
1692 * gfs2_getattr - Read out an inode's attributes
1693 * @mnt: The vfsmount the inode is being accessed from
1694 * @dentry: The dentry to stat
1695 * @stat: The inode's stats
1696 *
1697 * This may be called from the VFS directly, or from within GFS2 with the
1698 * inode locked, so we look to see if the glock is already locked and only
1699 * lock the glock if its not already been done. Note that its the NFS
1700 * readdirplus operation which causes this to be called (from filldir)
1701 * with the glock already held.
1702 *
1703 * Returns: errno
1704 */
1705
1706 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1707 struct kstat *stat)
1708 {
1709 struct inode *inode = dentry->d_inode;
1710 struct gfs2_inode *ip = GFS2_I(inode);
1711 struct gfs2_holder gh;
1712 int error;
1713 int unlock = 0;
1714
1715 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1716 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1717 if (error)
1718 return error;
1719 unlock = 1;
1720 }
1721
1722 generic_fillattr(inode, stat);
1723 if (unlock)
1724 gfs2_glock_dq_uninit(&gh);
1725
1726 return 0;
1727 }
1728
1729 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1730 const void *data, size_t size, int flags)
1731 {
1732 struct inode *inode = dentry->d_inode;
1733 struct gfs2_inode *ip = GFS2_I(inode);
1734 struct gfs2_holder gh;
1735 int ret;
1736
1737 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1738 ret = gfs2_glock_nq(&gh);
1739 if (ret == 0) {
1740 ret = gfs2_rs_alloc(ip);
1741 if (ret == 0)
1742 ret = generic_setxattr(dentry, name, data, size, flags);
1743 gfs2_glock_dq(&gh);
1744 }
1745 gfs2_holder_uninit(&gh);
1746 return ret;
1747 }
1748
1749 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1750 void *data, size_t size)
1751 {
1752 struct inode *inode = dentry->d_inode;
1753 struct gfs2_inode *ip = GFS2_I(inode);
1754 struct gfs2_holder gh;
1755 int ret;
1756
1757 /* For selinux during lookup */
1758 if (gfs2_glock_is_locked_by_me(ip->i_gl))
1759 return generic_getxattr(dentry, name, data, size);
1760
1761 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1762 ret = gfs2_glock_nq(&gh);
1763 if (ret == 0) {
1764 ret = generic_getxattr(dentry, name, data, size);
1765 gfs2_glock_dq(&gh);
1766 }
1767 gfs2_holder_uninit(&gh);
1768 return ret;
1769 }
1770
1771 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1772 {
1773 struct inode *inode = dentry->d_inode;
1774 struct gfs2_inode *ip = GFS2_I(inode);
1775 struct gfs2_holder gh;
1776 int ret;
1777
1778 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1779 ret = gfs2_glock_nq(&gh);
1780 if (ret == 0) {
1781 ret = gfs2_rs_alloc(ip);
1782 if (ret == 0)
1783 ret = generic_removexattr(dentry, name);
1784 gfs2_glock_dq(&gh);
1785 }
1786 gfs2_holder_uninit(&gh);
1787 return ret;
1788 }
1789
1790 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1791 u64 start, u64 len)
1792 {
1793 struct gfs2_inode *ip = GFS2_I(inode);
1794 struct gfs2_holder gh;
1795 int ret;
1796
1797 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1798 if (ret)
1799 return ret;
1800
1801 mutex_lock(&inode->i_mutex);
1802
1803 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1804 if (ret)
1805 goto out;
1806
1807 if (gfs2_is_stuffed(ip)) {
1808 u64 phys = ip->i_no_addr << inode->i_blkbits;
1809 u64 size = i_size_read(inode);
1810 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1811 FIEMAP_EXTENT_DATA_INLINE;
1812 phys += sizeof(struct gfs2_dinode);
1813 phys += start;
1814 if (start + len > size)
1815 len = size - start;
1816 if (start < size)
1817 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1818 len, flags);
1819 if (ret == 1)
1820 ret = 0;
1821 } else {
1822 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1823 gfs2_block_map);
1824 }
1825
1826 gfs2_glock_dq_uninit(&gh);
1827 out:
1828 mutex_unlock(&inode->i_mutex);
1829 return ret;
1830 }
1831
1832 const struct inode_operations gfs2_file_iops = {
1833 .permission = gfs2_permission,
1834 .setattr = gfs2_setattr,
1835 .getattr = gfs2_getattr,
1836 .setxattr = gfs2_setxattr,
1837 .getxattr = gfs2_getxattr,
1838 .listxattr = gfs2_listxattr,
1839 .removexattr = gfs2_removexattr,
1840 .fiemap = gfs2_fiemap,
1841 .get_acl = gfs2_get_acl,
1842 };
1843
1844 const struct inode_operations gfs2_dir_iops = {
1845 .create = gfs2_create,
1846 .lookup = gfs2_lookup,
1847 .link = gfs2_link,
1848 .unlink = gfs2_unlink,
1849 .symlink = gfs2_symlink,
1850 .mkdir = gfs2_mkdir,
1851 .rmdir = gfs2_unlink,
1852 .mknod = gfs2_mknod,
1853 .rename = gfs2_rename,
1854 .permission = gfs2_permission,
1855 .setattr = gfs2_setattr,
1856 .getattr = gfs2_getattr,
1857 .setxattr = gfs2_setxattr,
1858 .getxattr = gfs2_getxattr,
1859 .listxattr = gfs2_listxattr,
1860 .removexattr = gfs2_removexattr,
1861 .fiemap = gfs2_fiemap,
1862 .get_acl = gfs2_get_acl,
1863 .atomic_open = gfs2_atomic_open,
1864 };
1865
1866 const struct inode_operations gfs2_symlink_iops = {
1867 .readlink = generic_readlink,
1868 .follow_link = gfs2_follow_link,
1869 .put_link = gfs2_put_link,
1870 .permission = gfs2_permission,
1871 .setattr = gfs2_setattr,
1872 .getattr = gfs2_getattr,
1873 .setxattr = gfs2_setxattr,
1874 .getxattr = gfs2_getxattr,
1875 .listxattr = gfs2_listxattr,
1876 .removexattr = gfs2_removexattr,
1877 .fiemap = gfs2_fiemap,
1878 .get_acl = gfs2_get_acl,
1879 };
1880
Linux kernel - Deliverables
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