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Linux 3.12.28
[linux/fpc-iii.git] / fs / gfs2 / inode.c
blobe803e3cafc536e9a247dd02e7b67789a4127b5b7
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 = PTR_ERR(d);
587 if (IS_ERR(d))
588 goto fail_gunlock;
589 error = 0;
590 if (file) {
591 if (S_ISREG(inode->i_mode)) {
592 WARN_ON(d != NULL);
593 error = finish_open(file, dentry, gfs2_open_common, opened);
594 } else {
595 error = finish_no_open(file, d);
596 }
597 } else {
598 dput(d);
599 }
600 gfs2_glock_dq_uninit(ghs);
601 return error;
602 } else if (error != -ENOENT) {
603 goto fail_gunlock;
604 }
605
606 arq = error = gfs2_diradd_alloc_required(dir, name);
607 if (error < 0)
608 goto fail_gunlock;
609
610 inode = new_inode(sdp->sd_vfs);
611 error = -ENOMEM;
612 if (!inode)
613 goto fail_gunlock;
614
615 ip = GFS2_I(inode);
616 error = gfs2_rs_alloc(ip);
617 if (error)
618 goto fail_free_inode;
619
620 inode->i_mode = mode;
621 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
622 inode->i_rdev = dev;
623 inode->i_size = size;
624 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
625 gfs2_set_inode_blocks(inode, 1);
626 munge_mode_uid_gid(dip, inode);
627 ip->i_goal = dip->i_goal;
628 ip->i_diskflags = 0;
629 ip->i_eattr = 0;
630 ip->i_height = 0;
631 ip->i_depth = 0;
632 ip->i_entries = 0;
633
634 switch(mode & S_IFMT) {
635 case S_IFREG:
636 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
637 gfs2_tune_get(sdp, gt_new_files_jdata))
638 ip->i_diskflags |= GFS2_DIF_JDATA;
639 gfs2_set_aops(inode);
640 break;
641 case S_IFDIR:
642 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
643 ip->i_diskflags |= GFS2_DIF_JDATA;
644 ip->i_entries = 2;
645 break;
646 }
647 gfs2_set_inode_flags(inode);
648
649 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) ||
650 (dip->i_diskflags & GFS2_DIF_TOPDIR))
651 aflags |= GFS2_AF_ORLOV;
652
653 error = alloc_dinode(ip, aflags);
654 if (error)
655 goto fail_free_inode;
656
657 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
658 if (error)
659 goto fail_free_inode;
660
661 ip->i_gl->gl_object = ip;
662 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
663 if (error)
664 goto fail_free_inode;
665
666 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
667 if (error)
668 goto fail_gunlock2;
669
670 init_dinode(dip, ip, symname);
671 gfs2_trans_end(sdp);
672
673 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
674 if (error)
675 goto fail_gunlock2;
676
677 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
678 if (error)
679 goto fail_gunlock2;
680
681 ip->i_iopen_gh.gh_gl->gl_object = ip;
682 gfs2_glock_put(io_gl);
683 gfs2_set_iop(inode);
684 insert_inode_hash(inode);
685
686 error = gfs2_acl_create(dip, inode);
687 if (error)
688 goto fail_gunlock3;
689
690 error = gfs2_security_init(dip, ip, name);
691 if (error)
692 goto fail_gunlock3;
693
694 error = link_dinode(dip, name, ip, arq);
695 if (error)
696 goto fail_gunlock3;
697
698 mark_inode_dirty(inode);
699 d_instantiate(dentry, inode);
700 if (file) {
701 *opened |= FILE_CREATED;
702 error = finish_open(file, dentry, gfs2_open_common, opened);
703 }
704 gfs2_glock_dq_uninit(ghs);
705 gfs2_glock_dq_uninit(ghs + 1);
706 return error;
707
708 fail_gunlock3:
709 gfs2_glock_dq_uninit(ghs + 1);
710 if (ip->i_gl)
711 gfs2_glock_put(ip->i_gl);
712 goto fail_gunlock;
713
714 fail_gunlock2:
715 gfs2_glock_dq_uninit(ghs + 1);
716 fail_free_inode:
717 if (ip->i_gl)
718 gfs2_glock_put(ip->i_gl);
719 gfs2_rs_delete(ip);
720 free_inode_nonrcu(inode);
721 inode = NULL;
722 fail_gunlock:
723 gfs2_glock_dq_uninit(ghs);
724 if (inode && !IS_ERR(inode)) {
725 clear_nlink(inode);
726 mark_inode_dirty(inode);
727 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags);
728 iput(inode);
729 }
730 fail:
731 return error;
732 }
733
734 /**
735 * gfs2_create - Create a file
736 * @dir: The directory in which to create the file
737 * @dentry: The dentry of the new file
738 * @mode: The mode of the new file
739 *
740 * Returns: errno
741 */
742
743 static int gfs2_create(struct inode *dir, struct dentry *dentry,
744 umode_t mode, bool excl)
745 {
746 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
747 }
748
749 /**
750 * __gfs2_lookup - Look up a filename in a directory and return its inode
751 * @dir: The directory inode
752 * @dentry: The dentry of the new inode
753 * @file: File to be opened
754 * @opened: atomic_open flags
755 *
756 *
757 * Returns: errno
758 */
759
760 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
761 struct file *file, int *opened)
762 {
763 struct inode *inode;
764 struct dentry *d;
765 struct gfs2_holder gh;
766 struct gfs2_glock *gl;
767 int error;
768
769 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
770 if (!inode)
771 return NULL;
772 if (IS_ERR(inode))
773 return ERR_CAST(inode);
774
775 gl = GFS2_I(inode)->i_gl;
776 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
777 if (error) {
778 iput(inode);
779 return ERR_PTR(error);
780 }
781
782 d = d_splice_alias(inode, dentry);
783 if (IS_ERR(d)) {
784 iput(inode);
785 gfs2_glock_dq_uninit(&gh);
786 return d;
787 }
788 if (file && S_ISREG(inode->i_mode))
789 error = finish_open(file, dentry, gfs2_open_common, opened);
790
791 gfs2_glock_dq_uninit(&gh);
792 if (error) {
793 dput(d);
794 return ERR_PTR(error);
795 }
796 return d;
797 }
798
799 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
800 unsigned flags)
801 {
802 return __gfs2_lookup(dir, dentry, NULL, NULL);
803 }
804
805 /**
806 * gfs2_link - Link to a file
807 * @old_dentry: The inode to link
808 * @dir: Add link to this directory
809 * @dentry: The name of the link
810 *
811 * Link the inode in "old_dentry" into the directory "dir" with the
812 * name in "dentry".
813 *
814 * Returns: errno
815 */
816
817 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
818 struct dentry *dentry)
819 {
820 struct gfs2_inode *dip = GFS2_I(dir);
821 struct gfs2_sbd *sdp = GFS2_SB(dir);
822 struct inode *inode = old_dentry->d_inode;
823 struct gfs2_inode *ip = GFS2_I(inode);
824 struct gfs2_holder ghs[2];
825 struct buffer_head *dibh;
826 int alloc_required;
827 int error;
828
829 if (S_ISDIR(inode->i_mode))
830 return -EPERM;
831
832 error = gfs2_rs_alloc(dip);
833 if (error)
834 return error;
835
836 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
837 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
838
839 error = gfs2_glock_nq(ghs); /* parent */
840 if (error)
841 goto out_parent;
842
843 error = gfs2_glock_nq(ghs + 1); /* child */
844 if (error)
845 goto out_child;
846
847 error = -ENOENT;
848 if (inode->i_nlink == 0)
849 goto out_gunlock;
850
851 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
852 if (error)
853 goto out_gunlock;
854
855 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
856 switch (error) {
857 case -ENOENT:
858 break;
859 case 0:
860 error = -EEXIST;
861 default:
862 goto out_gunlock;
863 }
864
865 error = -EINVAL;
866 if (!dip->i_inode.i_nlink)
867 goto out_gunlock;
868 error = -EFBIG;
869 if (dip->i_entries == (u32)-1)
870 goto out_gunlock;
871 error = -EPERM;
872 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
873 goto out_gunlock;
874 error = -EINVAL;
875 if (!ip->i_inode.i_nlink)
876 goto out_gunlock;
877 error = -EMLINK;
878 if (ip->i_inode.i_nlink == (u32)-1)
879 goto out_gunlock;
880
881 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
882 if (error < 0)
883 goto out_gunlock;
884 error = 0;
885
886 if (alloc_required) {
887 error = gfs2_quota_lock_check(dip);
888 if (error)
889 goto out_gunlock;
890
891 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0);
892 if (error)
893 goto out_gunlock_q;
894
895 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
896 gfs2_rg_blocks(dip, sdp->sd_max_dirres) +
897 2 * RES_DINODE + RES_STATFS +
898 RES_QUOTA, 0);
899 if (error)
900 goto out_ipres;
901 } else {
902 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
903 if (error)
904 goto out_ipres;
905 }
906
907 error = gfs2_meta_inode_buffer(ip, &dibh);
908 if (error)
909 goto out_end_trans;
910
911 error = gfs2_dir_add(dir, &dentry->d_name, ip);
912 if (error)
913 goto out_brelse;
914
915 gfs2_trans_add_meta(ip->i_gl, dibh);
916 inc_nlink(&ip->i_inode);
917 ip->i_inode.i_ctime = CURRENT_TIME;
918 ihold(inode);
919 d_instantiate(dentry, inode);
920 mark_inode_dirty(inode);
921
922 out_brelse:
923 brelse(dibh);
924 out_end_trans:
925 gfs2_trans_end(sdp);
926 out_ipres:
927 if (alloc_required)
928 gfs2_inplace_release(dip);
929 out_gunlock_q:
930 if (alloc_required)
931 gfs2_quota_unlock(dip);
932 out_gunlock:
933 gfs2_glock_dq(ghs + 1);
934 out_child:
935 gfs2_glock_dq(ghs);
936 out_parent:
937 gfs2_holder_uninit(ghs);
938 gfs2_holder_uninit(ghs + 1);
939 return error;
940 }
941
942 /*
943 * gfs2_unlink_ok - check to see that a inode is still in a directory
944 * @dip: the directory
945 * @name: the name of the file
946 * @ip: the inode
947 *
948 * Assumes that the lock on (at least) @dip is held.
949 *
950 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
951 */
952
953 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
954 const struct gfs2_inode *ip)
955 {
956 int error;
957
958 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
959 return -EPERM;
960
961 if ((dip->i_inode.i_mode & S_ISVTX) &&
962 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
963 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
964 return -EPERM;
965
966 if (IS_APPEND(&dip->i_inode))
967 return -EPERM;
968
969 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
970 if (error)
971 return error;
972
973 error = gfs2_dir_check(&dip->i_inode, name, ip);
974 if (error)
975 return error;
976
977 return 0;
978 }
979
980 /**
981 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
982 * @dip: The parent directory
983 * @name: The name of the entry in the parent directory
984 * @inode: The inode to be removed
985 *
986 * Called with all the locks and in a transaction. This will only be
987 * called for a directory after it has been checked to ensure it is empty.
988 *
989 * Returns: 0 on success, or an error
990 */
991
992 static int gfs2_unlink_inode(struct gfs2_inode *dip,
993 const struct dentry *dentry)
994 {
995 struct inode *inode = dentry->d_inode;
996 struct gfs2_inode *ip = GFS2_I(inode);
997 int error;
998
999 error = gfs2_dir_del(dip, dentry);
1000 if (error)
1001 return error;
1002
1003 ip->i_entries = 0;
1004 inode->i_ctime = CURRENT_TIME;
1005 if (S_ISDIR(inode->i_mode))
1006 clear_nlink(inode);
1007 else
1008 drop_nlink(inode);
1009 mark_inode_dirty(inode);
1010 if (inode->i_nlink == 0)
1011 gfs2_unlink_di(inode);
1012 return 0;
1013 }
1014
1015
1016 /**
1017 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1018 * @dir: The inode of the directory containing the inode to unlink
1019 * @dentry: The file itself
1020 *
1021 * This routine uses the type of the inode as a flag to figure out
1022 * whether this is an unlink or an rmdir.
1023 *
1024 * Returns: errno
1025 */
1026
1027 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1028 {
1029 struct gfs2_inode *dip = GFS2_I(dir);
1030 struct gfs2_sbd *sdp = GFS2_SB(dir);
1031 struct inode *inode = dentry->d_inode;
1032 struct gfs2_inode *ip = GFS2_I(inode);
1033 struct gfs2_holder ghs[3];
1034 struct gfs2_rgrpd *rgd;
1035 int error;
1036
1037 error = gfs2_rindex_update(sdp);
1038 if (error)
1039 return error;
1040
1041 error = -EROFS;
1042
1043 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1044 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1045
1046 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1047 if (!rgd)
1048 goto out_inodes;
1049
1050 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1051
1052
1053 error = gfs2_glock_nq(ghs); /* parent */
1054 if (error)
1055 goto out_parent;
1056
1057 error = gfs2_glock_nq(ghs + 1); /* child */
1058 if (error)
1059 goto out_child;
1060
1061 error = -ENOENT;
1062 if (inode->i_nlink == 0)
1063 goto out_rgrp;
1064
1065 if (S_ISDIR(inode->i_mode)) {
1066 error = -ENOTEMPTY;
1067 if (ip->i_entries > 2 || inode->i_nlink > 2)
1068 goto out_rgrp;
1069 }
1070
1071 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1072 if (error)
1073 goto out_rgrp;
1074
1075 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1076 if (error)
1077 goto out_gunlock;
1078
1079 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1080 if (error)
1081 goto out_end_trans;
1082
1083 error = gfs2_unlink_inode(dip, dentry);
1084
1085 out_end_trans:
1086 gfs2_trans_end(sdp);
1087 out_gunlock:
1088 gfs2_glock_dq(ghs + 2);
1089 out_rgrp:
1090 gfs2_glock_dq(ghs + 1);
1091 out_child:
1092 gfs2_glock_dq(ghs);
1093 out_parent:
1094 gfs2_holder_uninit(ghs + 2);
1095 out_inodes:
1096 gfs2_holder_uninit(ghs + 1);
1097 gfs2_holder_uninit(ghs);
1098 return error;
1099 }
1100
1101 /**
1102 * gfs2_symlink - Create a symlink
1103 * @dir: The directory to create the symlink in
1104 * @dentry: The dentry to put the symlink in
1105 * @symname: The thing which the link points to
1106 *
1107 * Returns: errno
1108 */
1109
1110 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1111 const char *symname)
1112 {
1113 struct gfs2_sbd *sdp = GFS2_SB(dir);
1114 unsigned int size;
1115
1116 size = strlen(symname);
1117 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1118 return -ENAMETOOLONG;
1119
1120 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1121 }
1122
1123 /**
1124 * gfs2_mkdir - Make a directory
1125 * @dir: The parent directory of the new one
1126 * @dentry: The dentry of the new directory
1127 * @mode: The mode of the new directory
1128 *
1129 * Returns: errno
1130 */
1131
1132 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1133 {
1134 struct gfs2_sbd *sdp = GFS2_SB(dir);
1135 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1136 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1137 }
1138
1139 /**
1140 * gfs2_mknod - Make a special file
1141 * @dir: The directory in which the special file will reside
1142 * @dentry: The dentry of the special file
1143 * @mode: The mode of the special file
1144 * @dev: The device specification of the special file
1145 *
1146 */
1147
1148 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1149 dev_t dev)
1150 {
1151 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1152 }
1153
1154 /**
1155 * gfs2_atomic_open - Atomically open a file
1156 * @dir: The directory
1157 * @dentry: The proposed new entry
1158 * @file: The proposed new struct file
1159 * @flags: open flags
1160 * @mode: File mode
1161 * @opened: Flag to say whether the file has been opened or not
1162 *
1163 * Returns: error code or 0 for success
1164 */
1165
1166 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1167 struct file *file, unsigned flags,
1168 umode_t mode, int *opened)
1169 {
1170 struct dentry *d;
1171 bool excl = !!(flags & O_EXCL);
1172
1173 d = __gfs2_lookup(dir, dentry, file, opened);
1174 if (IS_ERR(d))
1175 return PTR_ERR(d);
1176 if (d != NULL)
1177 dentry = d;
1178 if (dentry->d_inode) {
1179 if (!(*opened & FILE_OPENED)) {
1180 if (d == NULL)
1181 dget(dentry);
1182 return finish_no_open(file, dentry);
1183 }
1184 dput(d);
1185 return 0;
1186 }
1187
1188 BUG_ON(d != NULL);
1189 if (!(flags & O_CREAT))
1190 return -ENOENT;
1191
1192 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1193 }
1194
1195 /*
1196 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1197 * @this: move this
1198 * @to: to here
1199 *
1200 * Follow @to back to the root and make sure we don't encounter @this
1201 * Assumes we already hold the rename lock.
1202 *
1203 * Returns: errno
1204 */
1205
1206 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1207 {
1208 struct inode *dir = &to->i_inode;
1209 struct super_block *sb = dir->i_sb;
1210 struct inode *tmp;
1211 int error = 0;
1212
1213 igrab(dir);
1214
1215 for (;;) {
1216 if (dir == &this->i_inode) {
1217 error = -EINVAL;
1218 break;
1219 }
1220 if (dir == sb->s_root->d_inode) {
1221 error = 0;
1222 break;
1223 }
1224
1225 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1226 if (IS_ERR(tmp)) {
1227 error = PTR_ERR(tmp);
1228 break;
1229 }
1230
1231 iput(dir);
1232 dir = tmp;
1233 }
1234
1235 iput(dir);
1236
1237 return error;
1238 }
1239
1240 /**
1241 * gfs2_rename - Rename a file
1242 * @odir: Parent directory of old file name
1243 * @odentry: The old dentry of the file
1244 * @ndir: Parent directory of new file name
1245 * @ndentry: The new dentry of the file
1246 *
1247 * Returns: errno
1248 */
1249
1250 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1251 struct inode *ndir, struct dentry *ndentry)
1252 {
1253 struct gfs2_inode *odip = GFS2_I(odir);
1254 struct gfs2_inode *ndip = GFS2_I(ndir);
1255 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1256 struct gfs2_inode *nip = NULL;
1257 struct gfs2_sbd *sdp = GFS2_SB(odir);
1258 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1259 struct gfs2_rgrpd *nrgd;
1260 unsigned int num_gh;
1261 int dir_rename = 0;
1262 int alloc_required = 0;
1263 unsigned int x;
1264 int error;
1265
1266 if (ndentry->d_inode) {
1267 nip = GFS2_I(ndentry->d_inode);
1268 if (ip == nip)
1269 return 0;
1270 }
1271
1272 error = gfs2_rindex_update(sdp);
1273 if (error)
1274 return error;
1275
1276 error = gfs2_rs_alloc(ndip);
1277 if (error)
1278 return error;
1279
1280 if (odip != ndip) {
1281 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1282 0, &r_gh);
1283 if (error)
1284 goto out;
1285
1286 if (S_ISDIR(ip->i_inode.i_mode)) {
1287 dir_rename = 1;
1288 /* don't move a dirctory into it's subdir */
1289 error = gfs2_ok_to_move(ip, ndip);
1290 if (error)
1291 goto out_gunlock_r;
1292 }
1293 }
1294
1295 num_gh = 1;
1296 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1297 if (odip != ndip) {
1298 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1299 num_gh++;
1300 }
1301 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1302 num_gh++;
1303
1304 if (nip) {
1305 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1306 num_gh++;
1307 /* grab the resource lock for unlink flag twiddling
1308 * this is the case of the target file already existing
1309 * so we unlink before doing the rename
1310 */
1311 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1312 if (nrgd)
1313 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1314 }
1315
1316 for (x = 0; x < num_gh; x++) {
1317 error = gfs2_glock_nq(ghs + x);
1318 if (error)
1319 goto out_gunlock;
1320 }
1321
1322 error = -ENOENT;
1323 if (ip->i_inode.i_nlink == 0)
1324 goto out_gunlock;
1325
1326 /* Check out the old directory */
1327
1328 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1329 if (error)
1330 goto out_gunlock;
1331
1332 /* Check out the new directory */
1333
1334 if (nip) {
1335 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1336 if (error)
1337 goto out_gunlock;
1338
1339 if (nip->i_inode.i_nlink == 0) {
1340 error = -EAGAIN;
1341 goto out_gunlock;
1342 }
1343
1344 if (S_ISDIR(nip->i_inode.i_mode)) {
1345 if (nip->i_entries < 2) {
1346 gfs2_consist_inode(nip);
1347 error = -EIO;
1348 goto out_gunlock;
1349 }
1350 if (nip->i_entries > 2) {
1351 error = -ENOTEMPTY;
1352 goto out_gunlock;
1353 }
1354 }
1355 } else {
1356 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1357 if (error)
1358 goto out_gunlock;
1359
1360 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1361 switch (error) {
1362 case -ENOENT:
1363 error = 0;
1364 break;
1365 case 0:
1366 error = -EEXIST;
1367 default:
1368 goto out_gunlock;
1369 };
1370
1371 if (odip != ndip) {
1372 if (!ndip->i_inode.i_nlink) {
1373 error = -ENOENT;
1374 goto out_gunlock;
1375 }
1376 if (ndip->i_entries == (u32)-1) {
1377 error = -EFBIG;
1378 goto out_gunlock;
1379 }
1380 if (S_ISDIR(ip->i_inode.i_mode) &&
1381 ndip->i_inode.i_nlink == (u32)-1) {
1382 error = -EMLINK;
1383 goto out_gunlock;
1384 }
1385 }
1386 }
1387
1388 /* Check out the dir to be renamed */
1389
1390 if (dir_rename) {
1391 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1392 if (error)
1393 goto out_gunlock;
1394 }
1395
1396 if (nip == NULL)
1397 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1398 error = alloc_required;
1399 if (error < 0)
1400 goto out_gunlock;
1401
1402 if (alloc_required) {
1403 error = gfs2_quota_lock_check(ndip);
1404 if (error)
1405 goto out_gunlock;
1406
1407 error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres, 0);
1408 if (error)
1409 goto out_gunlock_q;
1410
1411 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1412 gfs2_rg_blocks(ndip, sdp->sd_max_dirres) +
1413 4 * RES_DINODE + 4 * RES_LEAF +
1414 RES_STATFS + RES_QUOTA + 4, 0);
1415 if (error)
1416 goto out_ipreserv;
1417 } else {
1418 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1419 5 * RES_LEAF + 4, 0);
1420 if (error)
1421 goto out_gunlock;
1422 }
1423
1424 /* Remove the target file, if it exists */
1425
1426 if (nip)
1427 error = gfs2_unlink_inode(ndip, ndentry);
1428
1429 if (dir_rename) {
1430 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1431 if (error)
1432 goto out_end_trans;
1433 } else {
1434 struct buffer_head *dibh;
1435 error = gfs2_meta_inode_buffer(ip, &dibh);
1436 if (error)
1437 goto out_end_trans;
1438 ip->i_inode.i_ctime = CURRENT_TIME;
1439 gfs2_trans_add_meta(ip->i_gl, dibh);
1440 gfs2_dinode_out(ip, dibh->b_data);
1441 brelse(dibh);
1442 }
1443
1444 error = gfs2_dir_del(odip, odentry);
1445 if (error)
1446 goto out_end_trans;
1447
1448 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1449 if (error)
1450 goto out_end_trans;
1451
1452 out_end_trans:
1453 gfs2_trans_end(sdp);
1454 out_ipreserv:
1455 if (alloc_required)
1456 gfs2_inplace_release(ndip);
1457 out_gunlock_q:
1458 if (alloc_required)
1459 gfs2_quota_unlock(ndip);
1460 out_gunlock:
1461 while (x--) {
1462 gfs2_glock_dq(ghs + x);
1463 gfs2_holder_uninit(ghs + x);
1464 }
1465 out_gunlock_r:
1466 if (r_gh.gh_gl)
1467 gfs2_glock_dq_uninit(&r_gh);
1468 out:
1469 return error;
1470 }
1471
1472 /**
1473 * gfs2_follow_link - Follow a symbolic link
1474 * @dentry: The dentry of the link
1475 * @nd: Data that we pass to vfs_follow_link()
1476 *
1477 * This can handle symlinks of any size.
1478 *
1479 * Returns: 0 on success or error code
1480 */
1481
1482 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1483 {
1484 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1485 struct gfs2_holder i_gh;
1486 struct buffer_head *dibh;
1487 unsigned int size;
1488 char *buf;
1489 int error;
1490
1491 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1492 error = gfs2_glock_nq(&i_gh);
1493 if (error) {
1494 gfs2_holder_uninit(&i_gh);
1495 nd_set_link(nd, ERR_PTR(error));
1496 return NULL;
1497 }
1498
1499 size = (unsigned int)i_size_read(&ip->i_inode);
1500 if (size == 0) {
1501 gfs2_consist_inode(ip);
1502 buf = ERR_PTR(-EIO);
1503 goto out;
1504 }
1505
1506 error = gfs2_meta_inode_buffer(ip, &dibh);
1507 if (error) {
1508 buf = ERR_PTR(error);
1509 goto out;
1510 }
1511
1512 buf = kzalloc(size + 1, GFP_NOFS);
1513 if (!buf)
1514 buf = ERR_PTR(-ENOMEM);
1515 else
1516 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1517 brelse(dibh);
1518 out:
1519 gfs2_glock_dq_uninit(&i_gh);
1520 nd_set_link(nd, buf);
1521 return NULL;
1522 }
1523
1524 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1525 {
1526 char *s = nd_get_link(nd);
1527 if (!IS_ERR(s))
1528 kfree(s);
1529 }
1530
1531 /**
1532 * gfs2_permission -
1533 * @inode: The inode
1534 * @mask: The mask to be tested
1535 * @flags: Indicates whether this is an RCU path walk or not
1536 *
1537 * This may be called from the VFS directly, or from within GFS2 with the
1538 * inode locked, so we look to see if the glock is already locked and only
1539 * lock the glock if its not already been done.
1540 *
1541 * Returns: errno
1542 */
1543
1544 int gfs2_permission(struct inode *inode, int mask)
1545 {
1546 struct gfs2_inode *ip;
1547 struct gfs2_holder i_gh;
1548 int error;
1549 int unlock = 0;
1550
1551
1552 ip = GFS2_I(inode);
1553 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1554 if (mask & MAY_NOT_BLOCK)
1555 return -ECHILD;
1556 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1557 if (error)
1558 return error;
1559 unlock = 1;
1560 }
1561
1562 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1563 error = -EACCES;
1564 else
1565 error = generic_permission(inode, mask);
1566 if (unlock)
1567 gfs2_glock_dq_uninit(&i_gh);
1568
1569 return error;
1570 }
1571
1572 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1573 {
1574 setattr_copy(inode, attr);
1575 mark_inode_dirty(inode);
1576 return 0;
1577 }
1578
1579 /**
1580 * gfs2_setattr_simple -
1581 * @ip:
1582 * @attr:
1583 *
1584 * Returns: errno
1585 */
1586
1587 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1588 {
1589 int error;
1590
1591 if (current->journal_info)
1592 return __gfs2_setattr_simple(inode, attr);
1593
1594 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1595 if (error)
1596 return error;
1597
1598 error = __gfs2_setattr_simple(inode, attr);
1599 gfs2_trans_end(GFS2_SB(inode));
1600 return error;
1601 }
1602
1603 static int setattr_chown(struct inode *inode, struct iattr *attr)
1604 {
1605 struct gfs2_inode *ip = GFS2_I(inode);
1606 struct gfs2_sbd *sdp = GFS2_SB(inode);
1607 kuid_t ouid, nuid;
1608 kgid_t ogid, ngid;
1609 int error;
1610
1611 ouid = inode->i_uid;
1612 ogid = inode->i_gid;
1613 nuid = attr->ia_uid;
1614 ngid = attr->ia_gid;
1615
1616 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1617 ouid = nuid = NO_UID_QUOTA_CHANGE;
1618 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1619 ogid = ngid = NO_GID_QUOTA_CHANGE;
1620
1621 error = get_write_access(inode);
1622 if (error)
1623 return error;
1624
1625 error = gfs2_rs_alloc(ip);
1626 if (error)
1627 goto out;
1628
1629 error = gfs2_rindex_update(sdp);
1630 if (error)
1631 goto out;
1632
1633 error = gfs2_quota_lock(ip, nuid, ngid);
1634 if (error)
1635 goto out;
1636
1637 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1638 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1639 error = gfs2_quota_check(ip, nuid, ngid);
1640 if (error)
1641 goto out_gunlock_q;
1642 }
1643
1644 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1645 if (error)
1646 goto out_gunlock_q;
1647
1648 error = gfs2_setattr_simple(inode, attr);
1649 if (error)
1650 goto out_end_trans;
1651
1652 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1653 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1654 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1655 gfs2_quota_change(ip, -blocks, ouid, ogid);
1656 gfs2_quota_change(ip, blocks, nuid, ngid);
1657 }
1658
1659 out_end_trans:
1660 gfs2_trans_end(sdp);
1661 out_gunlock_q:
1662 gfs2_quota_unlock(ip);
1663 out:
1664 put_write_access(inode);
1665 return error;
1666 }
1667
1668 /**
1669 * gfs2_setattr - Change attributes on an inode
1670 * @dentry: The dentry which is changing
1671 * @attr: The structure describing the change
1672 *
1673 * The VFS layer wants to change one or more of an inodes attributes. Write
1674 * that change out to disk.
1675 *
1676 * Returns: errno
1677 */
1678
1679 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1680 {
1681 struct inode *inode = dentry->d_inode;
1682 struct gfs2_inode *ip = GFS2_I(inode);
1683 struct gfs2_holder i_gh;
1684 int error;
1685
1686 error = gfs2_rs_alloc(ip);
1687 if (error)
1688 return error;
1689
1690 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1691 if (error)
1692 return error;
1693
1694 error = -EPERM;
1695 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1696 goto out;
1697
1698 error = inode_change_ok(inode, attr);
1699 if (error)
1700 goto out;
1701
1702 if (attr->ia_valid & ATTR_SIZE)
1703 error = gfs2_setattr_size(inode, attr->ia_size);
1704 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1705 error = setattr_chown(inode, attr);
1706 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1707 error = gfs2_acl_chmod(ip, attr);
1708 else
1709 error = gfs2_setattr_simple(inode, attr);
1710
1711 out:
1712 if (!error)
1713 mark_inode_dirty(inode);
1714 gfs2_glock_dq_uninit(&i_gh);
1715 return error;
1716 }
1717
1718 /**
1719 * gfs2_getattr - Read out an inode's attributes
1720 * @mnt: The vfsmount the inode is being accessed from
1721 * @dentry: The dentry to stat
1722 * @stat: The inode's stats
1723 *
1724 * This may be called from the VFS directly, or from within GFS2 with the
1725 * inode locked, so we look to see if the glock is already locked and only
1726 * lock the glock if its not already been done. Note that its the NFS
1727 * readdirplus operation which causes this to be called (from filldir)
1728 * with the glock already held.
1729 *
1730 * Returns: errno
1731 */
1732
1733 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1734 struct kstat *stat)
1735 {
1736 struct inode *inode = dentry->d_inode;
1737 struct gfs2_inode *ip = GFS2_I(inode);
1738 struct gfs2_holder gh;
1739 int error;
1740 int unlock = 0;
1741
1742 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1743 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1744 if (error)
1745 return error;
1746 unlock = 1;
1747 }
1748
1749 generic_fillattr(inode, stat);
1750 if (unlock)
1751 gfs2_glock_dq_uninit(&gh);
1752
1753 return 0;
1754 }
1755
1756 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1757 const void *data, size_t size, int flags)
1758 {
1759 struct inode *inode = dentry->d_inode;
1760 struct gfs2_inode *ip = GFS2_I(inode);
1761 struct gfs2_holder gh;
1762 int ret;
1763
1764 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1765 ret = gfs2_glock_nq(&gh);
1766 if (ret == 0) {
1767 ret = gfs2_rs_alloc(ip);
1768 if (ret == 0)
1769 ret = generic_setxattr(dentry, name, data, size, flags);
1770 gfs2_glock_dq(&gh);
1771 }
1772 gfs2_holder_uninit(&gh);
1773 return ret;
1774 }
1775
1776 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1777 void *data, size_t size)
1778 {
1779 struct inode *inode = dentry->d_inode;
1780 struct gfs2_inode *ip = GFS2_I(inode);
1781 struct gfs2_holder gh;
1782 int ret;
1783
1784 /* For selinux during lookup */
1785 if (gfs2_glock_is_locked_by_me(ip->i_gl))
1786 return generic_getxattr(dentry, name, data, size);
1787
1788 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1789 ret = gfs2_glock_nq(&gh);
1790 if (ret == 0) {
1791 ret = generic_getxattr(dentry, name, data, size);
1792 gfs2_glock_dq(&gh);
1793 }
1794 gfs2_holder_uninit(&gh);
1795 return ret;
1796 }
1797
1798 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1799 {
1800 struct inode *inode = dentry->d_inode;
1801 struct gfs2_inode *ip = GFS2_I(inode);
1802 struct gfs2_holder gh;
1803 int ret;
1804
1805 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1806 ret = gfs2_glock_nq(&gh);
1807 if (ret == 0) {
1808 ret = gfs2_rs_alloc(ip);
1809 if (ret == 0)
1810 ret = generic_removexattr(dentry, name);
1811 gfs2_glock_dq(&gh);
1812 }
1813 gfs2_holder_uninit(&gh);
1814 return ret;
1815 }
1816
1817 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1818 u64 start, u64 len)
1819 {
1820 struct gfs2_inode *ip = GFS2_I(inode);
1821 struct gfs2_holder gh;
1822 int ret;
1823
1824 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1825 if (ret)
1826 return ret;
1827
1828 mutex_lock(&inode->i_mutex);
1829
1830 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1831 if (ret)
1832 goto out;
1833
1834 if (gfs2_is_stuffed(ip)) {
1835 u64 phys = ip->i_no_addr << inode->i_blkbits;
1836 u64 size = i_size_read(inode);
1837 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1838 FIEMAP_EXTENT_DATA_INLINE;
1839 phys += sizeof(struct gfs2_dinode);
1840 phys += start;
1841 if (start + len > size)
1842 len = size - start;
1843 if (start < size)
1844 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1845 len, flags);
1846 if (ret == 1)
1847 ret = 0;
1848 } else {
1849 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1850 gfs2_block_map);
1851 }
1852
1853 gfs2_glock_dq_uninit(&gh);
1854 out:
1855 mutex_unlock(&inode->i_mutex);
1856 return ret;
1857 }
1858
1859 const struct inode_operations gfs2_file_iops = {
1860 .permission = gfs2_permission,
1861 .setattr = gfs2_setattr,
1862 .getattr = gfs2_getattr,
1863 .setxattr = gfs2_setxattr,
1864 .getxattr = gfs2_getxattr,
1865 .listxattr = gfs2_listxattr,
1866 .removexattr = gfs2_removexattr,
1867 .fiemap = gfs2_fiemap,
1868 .get_acl = gfs2_get_acl,
1869 };
1870
1871 const struct inode_operations gfs2_dir_iops = {
1872 .create = gfs2_create,
1873 .lookup = gfs2_lookup,
1874 .link = gfs2_link,
1875 .unlink = gfs2_unlink,
1876 .symlink = gfs2_symlink,
1877 .mkdir = gfs2_mkdir,
1878 .rmdir = gfs2_unlink,
1879 .mknod = gfs2_mknod,
1880 .rename = gfs2_rename,
1881 .permission = gfs2_permission,
1882 .setattr = gfs2_setattr,
1883 .getattr = gfs2_getattr,
1884 .setxattr = gfs2_setxattr,
1885 .getxattr = gfs2_getxattr,
1886 .listxattr = gfs2_listxattr,
1887 .removexattr = gfs2_removexattr,
1888 .fiemap = gfs2_fiemap,
1889 .get_acl = gfs2_get_acl,
1890 .atomic_open = gfs2_atomic_open,
1891 };
1892
1893 const struct inode_operations gfs2_symlink_iops = {
1894 .readlink = generic_readlink,
1895 .follow_link = gfs2_follow_link,
1896 .put_link = gfs2_put_link,
1897 .permission = gfs2_permission,
1898 .setattr = gfs2_setattr,
1899 .getattr = gfs2_getattr,
1900 .setxattr = gfs2_setxattr,
1901 .getxattr = gfs2_getxattr,
1902 .listxattr = gfs2_listxattr,
1903 .removexattr = gfs2_removexattr,
1904 .fiemap = gfs2_fiemap,
1905 .get_acl = gfs2_get_acl,
1906 };
1907
Linux with added FPC-III support