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[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 struct gfs2_alloc_parms ap = { .target = RES_DINODE, .aflags = flags, };
383 int error;
384 int dblocks = 1;
385
386 error = gfs2_quota_lock_check(ip);
387 if (error)
388 goto out;
389
390 error = gfs2_inplace_reserve(ip, &ap);
391 if (error)
392 goto out_quota;
393
394 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 0);
395 if (error)
396 goto out_ipreserv;
397
398 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, &dblocks, 1, &ip->i_generation);
399 ip->i_no_formal_ino = ip->i_generation;
400 ip->i_inode.i_ino = ip->i_no_addr;
401 ip->i_goal = ip->i_no_addr;
402
403 gfs2_trans_end(sdp);
404
405 out_ipreserv:
406 gfs2_inplace_release(ip);
407 out_quota:
408 gfs2_quota_unlock(ip);
409 out:
410 return error;
411 }
412
413 static void gfs2_init_dir(struct buffer_head *dibh,
414 const struct gfs2_inode *parent)
415 {
416 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
417 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
418
419 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
420 dent->de_inum = di->di_num; /* already GFS2 endian */
421 dent->de_type = cpu_to_be16(DT_DIR);
422
423 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
424 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
425 gfs2_inum_out(parent, dent);
426 dent->de_type = cpu_to_be16(DT_DIR);
427
428 }
429
430 /**
431 * init_dinode - Fill in a new dinode structure
432 * @dip: The directory this inode is being created in
433 * @ip: The inode
434 * @symname: The symlink destination (if a symlink)
435 * @bhp: The buffer head (returned to caller)
436 *
437 */
438
439 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
440 const char *symname)
441 {
442 struct gfs2_dinode *di;
443 struct buffer_head *dibh;
444
445 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
446 gfs2_trans_add_meta(ip->i_gl, dibh);
447 di = (struct gfs2_dinode *)dibh->b_data;
448 gfs2_dinode_out(ip, di);
449
450 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
451 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
452 di->__pad1 = 0;
453 di->__pad2 = 0;
454 di->__pad3 = 0;
455 memset(&di->__pad4, 0, sizeof(di->__pad4));
456 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
457 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
458
459 switch(ip->i_inode.i_mode & S_IFMT) {
460 case S_IFDIR:
461 gfs2_init_dir(dibh, dip);
462 break;
463 case S_IFLNK:
464 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
465 break;
466 }
467
468 set_buffer_uptodate(dibh);
469 brelse(dibh);
470 }
471
472 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
473 struct gfs2_inode *ip, struct gfs2_diradd *da)
474 {
475 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
476 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
477 int error;
478
479 if (da->nr_blocks) {
480 error = gfs2_quota_lock_check(dip);
481 if (error)
482 goto fail_quota_locks;
483
484 error = gfs2_inplace_reserve(dip, &ap);
485 if (error)
486 goto fail_quota_locks;
487
488 error = gfs2_trans_begin(sdp, da->nr_blocks +
489 gfs2_rg_blocks(dip, da->nr_blocks) +
490 2 * RES_DINODE +
491 RES_STATFS + RES_QUOTA, 0);
492 if (error)
493 goto fail_ipreserv;
494 } else {
495 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
496 if (error)
497 goto fail_quota_locks;
498 }
499
500 error = gfs2_dir_add(&dip->i_inode, name, ip);
501 if (error)
502 goto fail_end_trans;
503
504 fail_end_trans:
505 gfs2_trans_end(sdp);
506 fail_ipreserv:
507 gfs2_inplace_release(dip);
508 fail_quota_locks:
509 gfs2_quota_unlock(dip);
510 return error;
511 }
512
513 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
514 void *fs_info)
515 {
516 const struct xattr *xattr;
517 int err = 0;
518
519 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
520 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
521 xattr->value_len, 0,
522 GFS2_EATYPE_SECURITY);
523 if (err < 0)
524 break;
525 }
526 return err;
527 }
528
529 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
530 const struct qstr *qstr)
531 {
532 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
533 &gfs2_initxattrs, NULL);
534 }
535
536 /**
537 * gfs2_create_inode - Create a new inode
538 * @dir: The parent directory
539 * @dentry: The new dentry
540 * @file: If non-NULL, the file which is being opened
541 * @mode: The permissions on the new inode
542 * @dev: For device nodes, this is the device number
543 * @symname: For symlinks, this is the link destination
544 * @size: The initial size of the inode (ignored for directories)
545 *
546 * Returns: 0 on success, or error code
547 */
548
549 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
550 struct file *file,
551 umode_t mode, dev_t dev, const char *symname,
552 unsigned int size, int excl, int *opened)
553 {
554 const struct qstr *name = &dentry->d_name;
555 struct gfs2_holder ghs[2];
556 struct inode *inode = NULL;
557 struct gfs2_inode *dip = GFS2_I(dir), *ip;
558 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
559 struct gfs2_glock *io_gl;
560 struct dentry *d;
561 int error;
562 u32 aflags = 0;
563 struct gfs2_diradd da;
564
565 if (!name->len || name->len > GFS2_FNAMESIZE)
566 return -ENAMETOOLONG;
567
568 error = gfs2_rs_alloc(dip);
569 if (error)
570 return error;
571
572 error = gfs2_rindex_update(sdp);
573 if (error)
574 return error;
575
576 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
577 if (error)
578 goto fail;
579
580 error = create_ok(dip, name, mode);
581 if (error)
582 goto fail_gunlock;
583
584 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
585 error = PTR_ERR(inode);
586 if (!IS_ERR(inode)) {
587 d = d_splice_alias(inode, dentry);
588 error = 0;
589 if (file) {
590 if (S_ISREG(inode->i_mode)) {
591 WARN_ON(d != NULL);
592 error = finish_open(file, dentry, gfs2_open_common, opened);
593 } else {
594 error = finish_no_open(file, d);
595 }
596 } else {
597 dput(d);
598 }
599 gfs2_glock_dq_uninit(ghs);
600 return error;
601 } else if (error != -ENOENT) {
602 goto fail_gunlock;
603 }
604
605 error = gfs2_diradd_alloc_required(dir, name, &da);
606 if (error < 0)
607 goto fail_gunlock;
608
609 inode = new_inode(sdp->sd_vfs);
610 error = -ENOMEM;
611 if (!inode)
612 goto fail_gunlock;
613
614 ip = GFS2_I(inode);
615 error = gfs2_rs_alloc(ip);
616 if (error)
617 goto fail_free_inode;
618
619 inode->i_mode = mode;
620 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
621 inode->i_rdev = dev;
622 inode->i_size = size;
623 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
624 gfs2_set_inode_blocks(inode, 1);
625 munge_mode_uid_gid(dip, inode);
626 ip->i_goal = dip->i_goal;
627 ip->i_diskflags = 0;
628 ip->i_eattr = 0;
629 ip->i_height = 0;
630 ip->i_depth = 0;
631 ip->i_entries = 0;
632
633 switch(mode & S_IFMT) {
634 case S_IFREG:
635 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
636 gfs2_tune_get(sdp, gt_new_files_jdata))
637 ip->i_diskflags |= GFS2_DIF_JDATA;
638 gfs2_set_aops(inode);
639 break;
640 case S_IFDIR:
641 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
642 ip->i_diskflags |= GFS2_DIF_JDATA;
643 ip->i_entries = 2;
644 break;
645 }
646 gfs2_set_inode_flags(inode);
647
648 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) ||
649 (dip->i_diskflags & GFS2_DIF_TOPDIR))
650 aflags |= GFS2_AF_ORLOV;
651
652 error = alloc_dinode(ip, aflags);
653 if (error)
654 goto fail_free_inode;
655
656 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
657 if (error)
658 goto fail_free_inode;
659
660 ip->i_gl->gl_object = ip;
661 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
662 if (error)
663 goto fail_free_inode;
664
665 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
666 if (error)
667 goto fail_gunlock2;
668
669 init_dinode(dip, ip, symname);
670 gfs2_trans_end(sdp);
671
672 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
673 if (error)
674 goto fail_gunlock2;
675
676 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
677 if (error)
678 goto fail_gunlock2;
679
680 ip->i_iopen_gh.gh_gl->gl_object = ip;
681 gfs2_glock_put(io_gl);
682 gfs2_set_iop(inode);
683 insert_inode_hash(inode);
684
685 error = gfs2_acl_create(dip, inode);
686 if (error)
687 goto fail_gunlock3;
688
689 error = gfs2_security_init(dip, ip, name);
690 if (error)
691 goto fail_gunlock3;
692
693 error = link_dinode(dip, name, ip, &da);
694 if (error)
695 goto fail_gunlock3;
696
697 mark_inode_dirty(inode);
698 d_instantiate(dentry, inode);
699 if (file) {
700 *opened |= FILE_CREATED;
701 error = finish_open(file, dentry, gfs2_open_common, opened);
702 }
703 gfs2_glock_dq_uninit(ghs);
704 gfs2_glock_dq_uninit(ghs + 1);
705 return error;
706
707 fail_gunlock3:
708 gfs2_glock_dq_uninit(ghs + 1);
709 if (ip->i_gl)
710 gfs2_glock_put(ip->i_gl);
711 goto fail_gunlock;
712
713 fail_gunlock2:
714 gfs2_glock_dq_uninit(ghs + 1);
715 fail_free_inode:
716 if (ip->i_gl)
717 gfs2_glock_put(ip->i_gl);
718 gfs2_rs_delete(ip, NULL);
719 free_inode_nonrcu(inode);
720 inode = NULL;
721 fail_gunlock:
722 gfs2_glock_dq_uninit(ghs);
723 if (inode && !IS_ERR(inode)) {
724 clear_nlink(inode);
725 mark_inode_dirty(inode);
726 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags);
727 iput(inode);
728 }
729 fail:
730 return error;
731 }
732
733 /**
734 * gfs2_create - Create a file
735 * @dir: The directory in which to create the file
736 * @dentry: The dentry of the new file
737 * @mode: The mode of the new file
738 *
739 * Returns: errno
740 */
741
742 static int gfs2_create(struct inode *dir, struct dentry *dentry,
743 umode_t mode, bool excl)
744 {
745 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
746 }
747
748 /**
749 * __gfs2_lookup - Look up a filename in a directory and return its inode
750 * @dir: The directory inode
751 * @dentry: The dentry of the new inode
752 * @file: File to be opened
753 * @opened: atomic_open flags
754 *
755 *
756 * Returns: errno
757 */
758
759 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
760 struct file *file, int *opened)
761 {
762 struct inode *inode;
763 struct dentry *d;
764 struct gfs2_holder gh;
765 struct gfs2_glock *gl;
766 int error;
767
768 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
769 if (!inode)
770 return NULL;
771 if (IS_ERR(inode))
772 return ERR_CAST(inode);
773
774 gl = GFS2_I(inode)->i_gl;
775 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
776 if (error) {
777 iput(inode);
778 return ERR_PTR(error);
779 }
780
781 d = d_splice_alias(inode, dentry);
782 if (file && S_ISREG(inode->i_mode))
783 error = finish_open(file, dentry, gfs2_open_common, opened);
784
785 gfs2_glock_dq_uninit(&gh);
786 if (error) {
787 dput(d);
788 return ERR_PTR(error);
789 }
790 return d;
791 }
792
793 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
794 unsigned flags)
795 {
796 return __gfs2_lookup(dir, dentry, NULL, NULL);
797 }
798
799 /**
800 * gfs2_link - Link to a file
801 * @old_dentry: The inode to link
802 * @dir: Add link to this directory
803 * @dentry: The name of the link
804 *
805 * Link the inode in "old_dentry" into the directory "dir" with the
806 * name in "dentry".
807 *
808 * Returns: errno
809 */
810
811 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
812 struct dentry *dentry)
813 {
814 struct gfs2_inode *dip = GFS2_I(dir);
815 struct gfs2_sbd *sdp = GFS2_SB(dir);
816 struct inode *inode = old_dentry->d_inode;
817 struct gfs2_inode *ip = GFS2_I(inode);
818 struct gfs2_holder ghs[2];
819 struct buffer_head *dibh;
820 struct gfs2_diradd da;
821 int error;
822
823 if (S_ISDIR(inode->i_mode))
824 return -EPERM;
825
826 error = gfs2_rs_alloc(dip);
827 if (error)
828 return error;
829
830 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
831 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
832
833 error = gfs2_glock_nq(ghs); /* parent */
834 if (error)
835 goto out_parent;
836
837 error = gfs2_glock_nq(ghs + 1); /* child */
838 if (error)
839 goto out_child;
840
841 error = -ENOENT;
842 if (inode->i_nlink == 0)
843 goto out_gunlock;
844
845 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
846 if (error)
847 goto out_gunlock;
848
849 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
850 switch (error) {
851 case -ENOENT:
852 break;
853 case 0:
854 error = -EEXIST;
855 default:
856 goto out_gunlock;
857 }
858
859 error = -EINVAL;
860 if (!dip->i_inode.i_nlink)
861 goto out_gunlock;
862 error = -EFBIG;
863 if (dip->i_entries == (u32)-1)
864 goto out_gunlock;
865 error = -EPERM;
866 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
867 goto out_gunlock;
868 error = -EINVAL;
869 if (!ip->i_inode.i_nlink)
870 goto out_gunlock;
871 error = -EMLINK;
872 if (ip->i_inode.i_nlink == (u32)-1)
873 goto out_gunlock;
874
875 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
876 if (error < 0)
877 goto out_gunlock;
878
879 if (da.nr_blocks) {
880 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
881 error = gfs2_quota_lock_check(dip);
882 if (error)
883 goto out_gunlock;
884
885 error = gfs2_inplace_reserve(dip, &ap);
886 if (error)
887 goto out_gunlock_q;
888
889 error = gfs2_trans_begin(sdp, da.nr_blocks +
890 gfs2_rg_blocks(dip, da.nr_blocks) +
891 2 * RES_DINODE + RES_STATFS +
892 RES_QUOTA, 0);
893 if (error)
894 goto out_ipres;
895 } else {
896 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
897 if (error)
898 goto out_ipres;
899 }
900
901 error = gfs2_meta_inode_buffer(ip, &dibh);
902 if (error)
903 goto out_end_trans;
904
905 error = gfs2_dir_add(dir, &dentry->d_name, ip);
906 if (error)
907 goto out_brelse;
908
909 gfs2_trans_add_meta(ip->i_gl, dibh);
910 inc_nlink(&ip->i_inode);
911 ip->i_inode.i_ctime = CURRENT_TIME;
912 ihold(inode);
913 d_instantiate(dentry, inode);
914 mark_inode_dirty(inode);
915
916 out_brelse:
917 brelse(dibh);
918 out_end_trans:
919 gfs2_trans_end(sdp);
920 out_ipres:
921 if (da.nr_blocks)
922 gfs2_inplace_release(dip);
923 out_gunlock_q:
924 if (da.nr_blocks)
925 gfs2_quota_unlock(dip);
926 out_gunlock:
927 gfs2_glock_dq(ghs + 1);
928 out_child:
929 gfs2_glock_dq(ghs);
930 out_parent:
931 gfs2_holder_uninit(ghs);
932 gfs2_holder_uninit(ghs + 1);
933 return error;
934 }
935
936 /*
937 * gfs2_unlink_ok - check to see that a inode is still in a directory
938 * @dip: the directory
939 * @name: the name of the file
940 * @ip: the inode
941 *
942 * Assumes that the lock on (at least) @dip is held.
943 *
944 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
945 */
946
947 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
948 const struct gfs2_inode *ip)
949 {
950 int error;
951
952 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
953 return -EPERM;
954
955 if ((dip->i_inode.i_mode & S_ISVTX) &&
956 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
957 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
958 return -EPERM;
959
960 if (IS_APPEND(&dip->i_inode))
961 return -EPERM;
962
963 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
964 if (error)
965 return error;
966
967 error = gfs2_dir_check(&dip->i_inode, name, ip);
968 if (error)
969 return error;
970
971 return 0;
972 }
973
974 /**
975 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
976 * @dip: The parent directory
977 * @name: The name of the entry in the parent directory
978 * @inode: The inode to be removed
979 *
980 * Called with all the locks and in a transaction. This will only be
981 * called for a directory after it has been checked to ensure it is empty.
982 *
983 * Returns: 0 on success, or an error
984 */
985
986 static int gfs2_unlink_inode(struct gfs2_inode *dip,
987 const struct dentry *dentry)
988 {
989 struct inode *inode = dentry->d_inode;
990 struct gfs2_inode *ip = GFS2_I(inode);
991 int error;
992
993 error = gfs2_dir_del(dip, dentry);
994 if (error)
995 return error;
996
997 ip->i_entries = 0;
998 inode->i_ctime = CURRENT_TIME;
999 if (S_ISDIR(inode->i_mode))
1000 clear_nlink(inode);
1001 else
1002 drop_nlink(inode);
1003 mark_inode_dirty(inode);
1004 if (inode->i_nlink == 0)
1005 gfs2_unlink_di(inode);
1006 return 0;
1007 }
1008
1009
1010 /**
1011 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1012 * @dir: The inode of the directory containing the inode to unlink
1013 * @dentry: The file itself
1014 *
1015 * This routine uses the type of the inode as a flag to figure out
1016 * whether this is an unlink or an rmdir.
1017 *
1018 * Returns: errno
1019 */
1020
1021 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1022 {
1023 struct gfs2_inode *dip = GFS2_I(dir);
1024 struct gfs2_sbd *sdp = GFS2_SB(dir);
1025 struct inode *inode = dentry->d_inode;
1026 struct gfs2_inode *ip = GFS2_I(inode);
1027 struct gfs2_holder ghs[3];
1028 struct gfs2_rgrpd *rgd;
1029 int error;
1030
1031 error = gfs2_rindex_update(sdp);
1032 if (error)
1033 return error;
1034
1035 error = -EROFS;
1036
1037 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1038 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1039
1040 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1041 if (!rgd)
1042 goto out_inodes;
1043
1044 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1045
1046
1047 error = gfs2_glock_nq(ghs); /* parent */
1048 if (error)
1049 goto out_parent;
1050
1051 error = gfs2_glock_nq(ghs + 1); /* child */
1052 if (error)
1053 goto out_child;
1054
1055 error = -ENOENT;
1056 if (inode->i_nlink == 0)
1057 goto out_rgrp;
1058
1059 if (S_ISDIR(inode->i_mode)) {
1060 error = -ENOTEMPTY;
1061 if (ip->i_entries > 2 || inode->i_nlink > 2)
1062 goto out_rgrp;
1063 }
1064
1065 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1066 if (error)
1067 goto out_rgrp;
1068
1069 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1070 if (error)
1071 goto out_gunlock;
1072
1073 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1074 if (error)
1075 goto out_end_trans;
1076
1077 error = gfs2_unlink_inode(dip, dentry);
1078
1079 out_end_trans:
1080 gfs2_trans_end(sdp);
1081 out_gunlock:
1082 gfs2_glock_dq(ghs + 2);
1083 out_rgrp:
1084 gfs2_glock_dq(ghs + 1);
1085 out_child:
1086 gfs2_glock_dq(ghs);
1087 out_parent:
1088 gfs2_holder_uninit(ghs + 2);
1089 out_inodes:
1090 gfs2_holder_uninit(ghs + 1);
1091 gfs2_holder_uninit(ghs);
1092 return error;
1093 }
1094
1095 /**
1096 * gfs2_symlink - Create a symlink
1097 * @dir: The directory to create the symlink in
1098 * @dentry: The dentry to put the symlink in
1099 * @symname: The thing which the link points to
1100 *
1101 * Returns: errno
1102 */
1103
1104 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1105 const char *symname)
1106 {
1107 struct gfs2_sbd *sdp = GFS2_SB(dir);
1108 unsigned int size;
1109
1110 size = strlen(symname);
1111 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1112 return -ENAMETOOLONG;
1113
1114 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1115 }
1116
1117 /**
1118 * gfs2_mkdir - Make a directory
1119 * @dir: The parent directory of the new one
1120 * @dentry: The dentry of the new directory
1121 * @mode: The mode of the new directory
1122 *
1123 * Returns: errno
1124 */
1125
1126 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1127 {
1128 struct gfs2_sbd *sdp = GFS2_SB(dir);
1129 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1130 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1131 }
1132
1133 /**
1134 * gfs2_mknod - Make a special file
1135 * @dir: The directory in which the special file will reside
1136 * @dentry: The dentry of the special file
1137 * @mode: The mode of the special file
1138 * @dev: The device specification of the special file
1139 *
1140 */
1141
1142 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1143 dev_t dev)
1144 {
1145 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1146 }
1147
1148 /**
1149 * gfs2_atomic_open - Atomically open a file
1150 * @dir: The directory
1151 * @dentry: The proposed new entry
1152 * @file: The proposed new struct file
1153 * @flags: open flags
1154 * @mode: File mode
1155 * @opened: Flag to say whether the file has been opened or not
1156 *
1157 * Returns: error code or 0 for success
1158 */
1159
1160 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1161 struct file *file, unsigned flags,
1162 umode_t mode, int *opened)
1163 {
1164 struct dentry *d;
1165 bool excl = !!(flags & O_EXCL);
1166
1167 d = __gfs2_lookup(dir, dentry, file, opened);
1168 if (IS_ERR(d))
1169 return PTR_ERR(d);
1170 if (d != NULL)
1171 dentry = d;
1172 if (dentry->d_inode) {
1173 if (!(*opened & FILE_OPENED)) {
1174 if (d == NULL)
1175 dget(dentry);
1176 return finish_no_open(file, dentry);
1177 }
1178 dput(d);
1179 return 0;
1180 }
1181
1182 BUG_ON(d != NULL);
1183 if (!(flags & O_CREAT))
1184 return -ENOENT;
1185
1186 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1187 }
1188
1189 /*
1190 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1191 * @this: move this
1192 * @to: to here
1193 *
1194 * Follow @to back to the root and make sure we don't encounter @this
1195 * Assumes we already hold the rename lock.
1196 *
1197 * Returns: errno
1198 */
1199
1200 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1201 {
1202 struct inode *dir = &to->i_inode;
1203 struct super_block *sb = dir->i_sb;
1204 struct inode *tmp;
1205 int error = 0;
1206
1207 igrab(dir);
1208
1209 for (;;) {
1210 if (dir == &this->i_inode) {
1211 error = -EINVAL;
1212 break;
1213 }
1214 if (dir == sb->s_root->d_inode) {
1215 error = 0;
1216 break;
1217 }
1218
1219 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1220 if (IS_ERR(tmp)) {
1221 error = PTR_ERR(tmp);
1222 break;
1223 }
1224
1225 iput(dir);
1226 dir = tmp;
1227 }
1228
1229 iput(dir);
1230
1231 return error;
1232 }
1233
1234 /**
1235 * gfs2_rename - Rename a file
1236 * @odir: Parent directory of old file name
1237 * @odentry: The old dentry of the file
1238 * @ndir: Parent directory of new file name
1239 * @ndentry: The new dentry of the file
1240 *
1241 * Returns: errno
1242 */
1243
1244 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1245 struct inode *ndir, struct dentry *ndentry)
1246 {
1247 struct gfs2_inode *odip = GFS2_I(odir);
1248 struct gfs2_inode *ndip = GFS2_I(ndir);
1249 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1250 struct gfs2_inode *nip = NULL;
1251 struct gfs2_sbd *sdp = GFS2_SB(odir);
1252 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1253 struct gfs2_rgrpd *nrgd;
1254 unsigned int num_gh;
1255 int dir_rename = 0;
1256 struct gfs2_diradd da = { .nr_blocks = 0, };
1257 unsigned int x;
1258 int error;
1259
1260 if (ndentry->d_inode) {
1261 nip = GFS2_I(ndentry->d_inode);
1262 if (ip == nip)
1263 return 0;
1264 }
1265
1266 error = gfs2_rindex_update(sdp);
1267 if (error)
1268 return error;
1269
1270 error = gfs2_rs_alloc(ndip);
1271 if (error)
1272 return error;
1273
1274 if (odip != ndip) {
1275 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1276 0, &r_gh);
1277 if (error)
1278 goto out;
1279
1280 if (S_ISDIR(ip->i_inode.i_mode)) {
1281 dir_rename = 1;
1282 /* don't move a dirctory into it's subdir */
1283 error = gfs2_ok_to_move(ip, ndip);
1284 if (error)
1285 goto out_gunlock_r;
1286 }
1287 }
1288
1289 num_gh = 1;
1290 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1291 if (odip != ndip) {
1292 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1293 num_gh++;
1294 }
1295 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1296 num_gh++;
1297
1298 if (nip) {
1299 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1300 num_gh++;
1301 /* grab the resource lock for unlink flag twiddling
1302 * this is the case of the target file already existing
1303 * so we unlink before doing the rename
1304 */
1305 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1306 if (nrgd)
1307 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1308 }
1309
1310 for (x = 0; x < num_gh; x++) {
1311 error = gfs2_glock_nq(ghs + x);
1312 if (error)
1313 goto out_gunlock;
1314 }
1315
1316 error = -ENOENT;
1317 if (ip->i_inode.i_nlink == 0)
1318 goto out_gunlock;
1319
1320 /* Check out the old directory */
1321
1322 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1323 if (error)
1324 goto out_gunlock;
1325
1326 /* Check out the new directory */
1327
1328 if (nip) {
1329 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1330 if (error)
1331 goto out_gunlock;
1332
1333 if (nip->i_inode.i_nlink == 0) {
1334 error = -EAGAIN;
1335 goto out_gunlock;
1336 }
1337
1338 if (S_ISDIR(nip->i_inode.i_mode)) {
1339 if (nip->i_entries < 2) {
1340 gfs2_consist_inode(nip);
1341 error = -EIO;
1342 goto out_gunlock;
1343 }
1344 if (nip->i_entries > 2) {
1345 error = -ENOTEMPTY;
1346 goto out_gunlock;
1347 }
1348 }
1349 } else {
1350 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1351 if (error)
1352 goto out_gunlock;
1353
1354 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1355 switch (error) {
1356 case -ENOENT:
1357 error = 0;
1358 break;
1359 case 0:
1360 error = -EEXIST;
1361 default:
1362 goto out_gunlock;
1363 };
1364
1365 if (odip != ndip) {
1366 if (!ndip->i_inode.i_nlink) {
1367 error = -ENOENT;
1368 goto out_gunlock;
1369 }
1370 if (ndip->i_entries == (u32)-1) {
1371 error = -EFBIG;
1372 goto out_gunlock;
1373 }
1374 if (S_ISDIR(ip->i_inode.i_mode) &&
1375 ndip->i_inode.i_nlink == (u32)-1) {
1376 error = -EMLINK;
1377 goto out_gunlock;
1378 }
1379 }
1380 }
1381
1382 /* Check out the dir to be renamed */
1383
1384 if (dir_rename) {
1385 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1386 if (error)
1387 goto out_gunlock;
1388 }
1389
1390 if (nip == NULL) {
1391 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1392 if (error)
1393 goto out_gunlock;
1394 }
1395
1396 if (da.nr_blocks) {
1397 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1398 error = gfs2_quota_lock_check(ndip);
1399 if (error)
1400 goto out_gunlock;
1401
1402 error = gfs2_inplace_reserve(ndip, &ap);
1403 if (error)
1404 goto out_gunlock_q;
1405
1406 error = gfs2_trans_begin(sdp, da.nr_blocks +
1407 gfs2_rg_blocks(ndip, da.nr_blocks) +
1408 4 * RES_DINODE + 4 * RES_LEAF +
1409 RES_STATFS + RES_QUOTA + 4, 0);
1410 if (error)
1411 goto out_ipreserv;
1412 } else {
1413 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1414 5 * RES_LEAF + 4, 0);
1415 if (error)
1416 goto out_gunlock;
1417 }
1418
1419 /* Remove the target file, if it exists */
1420
1421 if (nip)
1422 error = gfs2_unlink_inode(ndip, ndentry);
1423
1424 if (dir_rename) {
1425 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1426 if (error)
1427 goto out_end_trans;
1428 } else {
1429 struct buffer_head *dibh;
1430 error = gfs2_meta_inode_buffer(ip, &dibh);
1431 if (error)
1432 goto out_end_trans;
1433 ip->i_inode.i_ctime = CURRENT_TIME;
1434 gfs2_trans_add_meta(ip->i_gl, dibh);
1435 gfs2_dinode_out(ip, dibh->b_data);
1436 brelse(dibh);
1437 }
1438
1439 error = gfs2_dir_del(odip, odentry);
1440 if (error)
1441 goto out_end_trans;
1442
1443 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1444 if (error)
1445 goto out_end_trans;
1446
1447 out_end_trans:
1448 gfs2_trans_end(sdp);
1449 out_ipreserv:
1450 if (da.nr_blocks)
1451 gfs2_inplace_release(ndip);
1452 out_gunlock_q:
1453 if (da.nr_blocks)
1454 gfs2_quota_unlock(ndip);
1455 out_gunlock:
1456 while (x--) {
1457 gfs2_glock_dq(ghs + x);
1458 gfs2_holder_uninit(ghs + x);
1459 }
1460 out_gunlock_r:
1461 if (r_gh.gh_gl)
1462 gfs2_glock_dq_uninit(&r_gh);
1463 out:
1464 return error;
1465 }
1466
1467 /**
1468 * gfs2_follow_link - Follow a symbolic link
1469 * @dentry: The dentry of the link
1470 * @nd: Data that we pass to vfs_follow_link()
1471 *
1472 * This can handle symlinks of any size.
1473 *
1474 * Returns: 0 on success or error code
1475 */
1476
1477 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1478 {
1479 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1480 struct gfs2_holder i_gh;
1481 struct buffer_head *dibh;
1482 unsigned int size;
1483 char *buf;
1484 int error;
1485
1486 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1487 error = gfs2_glock_nq(&i_gh);
1488 if (error) {
1489 gfs2_holder_uninit(&i_gh);
1490 nd_set_link(nd, ERR_PTR(error));
1491 return NULL;
1492 }
1493
1494 size = (unsigned int)i_size_read(&ip->i_inode);
1495 if (size == 0) {
1496 gfs2_consist_inode(ip);
1497 buf = ERR_PTR(-EIO);
1498 goto out;
1499 }
1500
1501 error = gfs2_meta_inode_buffer(ip, &dibh);
1502 if (error) {
1503 buf = ERR_PTR(error);
1504 goto out;
1505 }
1506
1507 buf = kzalloc(size + 1, GFP_NOFS);
1508 if (!buf)
1509 buf = ERR_PTR(-ENOMEM);
1510 else
1511 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1512 brelse(dibh);
1513 out:
1514 gfs2_glock_dq_uninit(&i_gh);
1515 nd_set_link(nd, buf);
1516 return NULL;
1517 }
1518
1519 /**
1520 * gfs2_permission -
1521 * @inode: The inode
1522 * @mask: The mask to be tested
1523 * @flags: Indicates whether this is an RCU path walk or not
1524 *
1525 * This may be called from the VFS directly, or from within GFS2 with the
1526 * inode locked, so we look to see if the glock is already locked and only
1527 * lock the glock if its not already been done.
1528 *
1529 * Returns: errno
1530 */
1531
1532 int gfs2_permission(struct inode *inode, int mask)
1533 {
1534 struct gfs2_inode *ip;
1535 struct gfs2_holder i_gh;
1536 int error;
1537 int unlock = 0;
1538
1539
1540 ip = GFS2_I(inode);
1541 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1542 if (mask & MAY_NOT_BLOCK)
1543 return -ECHILD;
1544 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1545 if (error)
1546 return error;
1547 unlock = 1;
1548 }
1549
1550 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1551 error = -EACCES;
1552 else
1553 error = generic_permission(inode, mask);
1554 if (unlock)
1555 gfs2_glock_dq_uninit(&i_gh);
1556
1557 return error;
1558 }
1559
1560 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1561 {
1562 setattr_copy(inode, attr);
1563 mark_inode_dirty(inode);
1564 return 0;
1565 }
1566
1567 /**
1568 * gfs2_setattr_simple -
1569 * @ip:
1570 * @attr:
1571 *
1572 * Returns: errno
1573 */
1574
1575 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1576 {
1577 int error;
1578
1579 if (current->journal_info)
1580 return __gfs2_setattr_simple(inode, attr);
1581
1582 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1583 if (error)
1584 return error;
1585
1586 error = __gfs2_setattr_simple(inode, attr);
1587 gfs2_trans_end(GFS2_SB(inode));
1588 return error;
1589 }
1590
1591 static int setattr_chown(struct inode *inode, struct iattr *attr)
1592 {
1593 struct gfs2_inode *ip = GFS2_I(inode);
1594 struct gfs2_sbd *sdp = GFS2_SB(inode);
1595 kuid_t ouid, nuid;
1596 kgid_t ogid, ngid;
1597 int error;
1598
1599 ouid = inode->i_uid;
1600 ogid = inode->i_gid;
1601 nuid = attr->ia_uid;
1602 ngid = attr->ia_gid;
1603
1604 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1605 ouid = nuid = NO_UID_QUOTA_CHANGE;
1606 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1607 ogid = ngid = NO_GID_QUOTA_CHANGE;
1608
1609 error = gfs2_quota_lock(ip, nuid, ngid);
1610 if (error)
1611 return error;
1612
1613 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1614 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1615 error = gfs2_quota_check(ip, nuid, ngid);
1616 if (error)
1617 goto out_gunlock_q;
1618 }
1619
1620 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1621 if (error)
1622 goto out_gunlock_q;
1623
1624 error = gfs2_setattr_simple(inode, attr);
1625 if (error)
1626 goto out_end_trans;
1627
1628 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1629 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1630 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1631 gfs2_quota_change(ip, -blocks, ouid, ogid);
1632 gfs2_quota_change(ip, blocks, nuid, ngid);
1633 }
1634
1635 out_end_trans:
1636 gfs2_trans_end(sdp);
1637 out_gunlock_q:
1638 gfs2_quota_unlock(ip);
1639 return error;
1640 }
1641
1642 /**
1643 * gfs2_setattr - Change attributes on an inode
1644 * @dentry: The dentry which is changing
1645 * @attr: The structure describing the change
1646 *
1647 * The VFS layer wants to change one or more of an inodes attributes. Write
1648 * that change out to disk.
1649 *
1650 * Returns: errno
1651 */
1652
1653 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1654 {
1655 struct inode *inode = dentry->d_inode;
1656 struct gfs2_inode *ip = GFS2_I(inode);
1657 struct gfs2_holder i_gh;
1658 int error;
1659
1660 error = gfs2_rs_alloc(ip);
1661 if (error)
1662 return error;
1663
1664 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1665 if (error)
1666 return error;
1667
1668 error = -EPERM;
1669 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1670 goto out;
1671
1672 error = inode_change_ok(inode, attr);
1673 if (error)
1674 goto out;
1675
1676 if (attr->ia_valid & ATTR_SIZE)
1677 error = gfs2_setattr_size(inode, attr->ia_size);
1678 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1679 error = setattr_chown(inode, attr);
1680 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1681 error = gfs2_acl_chmod(ip, attr);
1682 else
1683 error = gfs2_setattr_simple(inode, attr);
1684
1685 out:
1686 if (!error)
1687 mark_inode_dirty(inode);
1688 gfs2_glock_dq_uninit(&i_gh);
1689 return error;
1690 }
1691
1692 /**
1693 * gfs2_getattr - Read out an inode's attributes
1694 * @mnt: The vfsmount the inode is being accessed from
1695 * @dentry: The dentry to stat
1696 * @stat: The inode's stats
1697 *
1698 * This may be called from the VFS directly, or from within GFS2 with the
1699 * inode locked, so we look to see if the glock is already locked and only
1700 * lock the glock if its not already been done. Note that its the NFS
1701 * readdirplus operation which causes this to be called (from filldir)
1702 * with the glock already held.
1703 *
1704 * Returns: errno
1705 */
1706
1707 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1708 struct kstat *stat)
1709 {
1710 struct inode *inode = dentry->d_inode;
1711 struct gfs2_inode *ip = GFS2_I(inode);
1712 struct gfs2_holder gh;
1713 int error;
1714 int unlock = 0;
1715
1716 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1717 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1718 if (error)
1719 return error;
1720 unlock = 1;
1721 }
1722
1723 generic_fillattr(inode, stat);
1724 if (unlock)
1725 gfs2_glock_dq_uninit(&gh);
1726
1727 return 0;
1728 }
1729
1730 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1731 const void *data, size_t size, int flags)
1732 {
1733 struct inode *inode = dentry->d_inode;
1734 struct gfs2_inode *ip = GFS2_I(inode);
1735 struct gfs2_holder gh;
1736 int ret;
1737
1738 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1739 ret = gfs2_glock_nq(&gh);
1740 if (ret == 0) {
1741 ret = gfs2_rs_alloc(ip);
1742 if (ret == 0)
1743 ret = generic_setxattr(dentry, name, data, size, flags);
1744 gfs2_glock_dq(&gh);
1745 }
1746 gfs2_holder_uninit(&gh);
1747 return ret;
1748 }
1749
1750 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1751 void *data, size_t size)
1752 {
1753 struct inode *inode = dentry->d_inode;
1754 struct gfs2_inode *ip = GFS2_I(inode);
1755 struct gfs2_holder gh;
1756 int ret;
1757
1758 /* For selinux during lookup */
1759 if (gfs2_glock_is_locked_by_me(ip->i_gl))
1760 return generic_getxattr(dentry, name, data, size);
1761
1762 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1763 ret = gfs2_glock_nq(&gh);
1764 if (ret == 0) {
1765 ret = generic_getxattr(dentry, name, data, size);
1766 gfs2_glock_dq(&gh);
1767 }
1768 gfs2_holder_uninit(&gh);
1769 return ret;
1770 }
1771
1772 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1773 {
1774 struct inode *inode = dentry->d_inode;
1775 struct gfs2_inode *ip = GFS2_I(inode);
1776 struct gfs2_holder gh;
1777 int ret;
1778
1779 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1780 ret = gfs2_glock_nq(&gh);
1781 if (ret == 0) {
1782 ret = gfs2_rs_alloc(ip);
1783 if (ret == 0)
1784 ret = generic_removexattr(dentry, name);
1785 gfs2_glock_dq(&gh);
1786 }
1787 gfs2_holder_uninit(&gh);
1788 return ret;
1789 }
1790
1791 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1792 u64 start, u64 len)
1793 {
1794 struct gfs2_inode *ip = GFS2_I(inode);
1795 struct gfs2_holder gh;
1796 int ret;
1797
1798 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1799 if (ret)
1800 return ret;
1801
1802 mutex_lock(&inode->i_mutex);
1803
1804 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1805 if (ret)
1806 goto out;
1807
1808 if (gfs2_is_stuffed(ip)) {
1809 u64 phys = ip->i_no_addr << inode->i_blkbits;
1810 u64 size = i_size_read(inode);
1811 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1812 FIEMAP_EXTENT_DATA_INLINE;
1813 phys += sizeof(struct gfs2_dinode);
1814 phys += start;
1815 if (start + len > size)
1816 len = size - start;
1817 if (start < size)
1818 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1819 len, flags);
1820 if (ret == 1)
1821 ret = 0;
1822 } else {
1823 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1824 gfs2_block_map);
1825 }
1826
1827 gfs2_glock_dq_uninit(&gh);
1828 out:
1829 mutex_unlock(&inode->i_mutex);
1830 return ret;
1831 }
1832
1833 const struct inode_operations gfs2_file_iops = {
1834 .permission = gfs2_permission,
1835 .setattr = gfs2_setattr,
1836 .getattr = gfs2_getattr,
1837 .setxattr = gfs2_setxattr,
1838 .getxattr = gfs2_getxattr,
1839 .listxattr = gfs2_listxattr,
1840 .removexattr = gfs2_removexattr,
1841 .fiemap = gfs2_fiemap,
1842 .get_acl = gfs2_get_acl,
1843 };
1844
1845 const struct inode_operations gfs2_dir_iops = {
1846 .create = gfs2_create,
1847 .lookup = gfs2_lookup,
1848 .link = gfs2_link,
1849 .unlink = gfs2_unlink,
1850 .symlink = gfs2_symlink,
1851 .mkdir = gfs2_mkdir,
1852 .rmdir = gfs2_unlink,
1853 .mknod = gfs2_mknod,
1854 .rename = gfs2_rename,
1855 .permission = gfs2_permission,
1856 .setattr = gfs2_setattr,
1857 .getattr = gfs2_getattr,
1858 .setxattr = gfs2_setxattr,
1859 .getxattr = gfs2_getxattr,
1860 .listxattr = gfs2_listxattr,
1861 .removexattr = gfs2_removexattr,
1862 .fiemap = gfs2_fiemap,
1863 .get_acl = gfs2_get_acl,
1864 .atomic_open = gfs2_atomic_open,
1865 };
1866
1867 const struct inode_operations gfs2_symlink_iops = {
1868 .readlink = generic_readlink,
1869 .follow_link = gfs2_follow_link,
1870 .put_link = kfree_put_link,
1871 .permission = gfs2_permission,
1872 .setattr = gfs2_setattr,
1873 .getattr = gfs2_getattr,
1874 .setxattr = gfs2_setxattr,
1875 .getxattr = gfs2_getxattr,
1876 .listxattr = gfs2_listxattr,
1877 .removexattr = gfs2_removexattr,
1878 .fiemap = gfs2_fiemap,
1879 .get_acl = gfs2_get_acl,
1880 };
1881
Linux kernel - Deliverables
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