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ftrace: Allow instances to use function tracing
[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(-ENOMEM);
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 /**
473 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
474 * @dip: The directory we are linking into
475 * @da: The dir add information
476 * @nr_inodes: The number of inodes involved
477 *
478 * This calculate the number of blocks we need to reserve in a
479 * transaction to link @nr_inodes into a directory. In most cases
480 * @nr_inodes will be 2 (the directory plus the inode being linked in)
481 * but in case of rename, 4 may be required.
482 *
483 * Returns: Number of blocks
484 */
485
486 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
487 const struct gfs2_diradd *da,
488 unsigned nr_inodes)
489 {
490 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
491 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
492 }
493
494 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
495 struct gfs2_inode *ip, struct gfs2_diradd *da)
496 {
497 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
498 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
499 int error;
500
501 if (da->nr_blocks) {
502 error = gfs2_quota_lock_check(dip);
503 if (error)
504 goto fail_quota_locks;
505
506 error = gfs2_inplace_reserve(dip, &ap);
507 if (error)
508 goto fail_quota_locks;
509
510 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
511 if (error)
512 goto fail_ipreserv;
513 } else {
514 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
515 if (error)
516 goto fail_quota_locks;
517 }
518
519 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
520 if (error)
521 goto fail_end_trans;
522
523 fail_end_trans:
524 gfs2_trans_end(sdp);
525 fail_ipreserv:
526 gfs2_inplace_release(dip);
527 fail_quota_locks:
528 gfs2_quota_unlock(dip);
529 return error;
530 }
531
532 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
533 void *fs_info)
534 {
535 const struct xattr *xattr;
536 int err = 0;
537
538 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
539 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
540 xattr->value_len, 0,
541 GFS2_EATYPE_SECURITY);
542 if (err < 0)
543 break;
544 }
545 return err;
546 }
547
548 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
549 const struct qstr *qstr)
550 {
551 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
552 &gfs2_initxattrs, NULL);
553 }
554
555 /**
556 * gfs2_create_inode - Create a new inode
557 * @dir: The parent directory
558 * @dentry: The new dentry
559 * @file: If non-NULL, the file which is being opened
560 * @mode: The permissions on the new inode
561 * @dev: For device nodes, this is the device number
562 * @symname: For symlinks, this is the link destination
563 * @size: The initial size of the inode (ignored for directories)
564 *
565 * Returns: 0 on success, or error code
566 */
567
568 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
569 struct file *file,
570 umode_t mode, dev_t dev, const char *symname,
571 unsigned int size, int excl, int *opened)
572 {
573 const struct qstr *name = &dentry->d_name;
574 struct posix_acl *default_acl, *acl;
575 struct gfs2_holder ghs[2];
576 struct inode *inode = NULL;
577 struct gfs2_inode *dip = GFS2_I(dir), *ip;
578 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
579 struct gfs2_glock *io_gl;
580 struct dentry *d;
581 int error;
582 u32 aflags = 0;
583 struct gfs2_diradd da = { .bh = NULL, };
584
585 if (!name->len || name->len > GFS2_FNAMESIZE)
586 return -ENAMETOOLONG;
587
588 error = gfs2_rs_alloc(dip);
589 if (error)
590 return error;
591
592 error = gfs2_rindex_update(sdp);
593 if (error)
594 return error;
595
596 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
597 if (error)
598 goto fail;
599
600 error = create_ok(dip, name, mode);
601 if (error)
602 goto fail_gunlock;
603
604 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
605 error = PTR_ERR(inode);
606 if (!IS_ERR(inode)) {
607 d = d_splice_alias(inode, dentry);
608 error = PTR_ERR(d);
609 if (IS_ERR(d))
610 goto fail_gunlock;
611 error = 0;
612 if (file) {
613 if (S_ISREG(inode->i_mode)) {
614 WARN_ON(d != NULL);
615 error = finish_open(file, dentry, gfs2_open_common, opened);
616 } else {
617 error = finish_no_open(file, d);
618 }
619 } else {
620 dput(d);
621 }
622 gfs2_glock_dq_uninit(ghs);
623 return error;
624 } else if (error != -ENOENT) {
625 goto fail_gunlock;
626 }
627
628 error = gfs2_diradd_alloc_required(dir, name, &da);
629 if (error < 0)
630 goto fail_gunlock;
631
632 inode = new_inode(sdp->sd_vfs);
633 error = -ENOMEM;
634 if (!inode)
635 goto fail_gunlock;
636
637 error = posix_acl_create(dir, &mode, &default_acl, &acl);
638 if (error)
639 goto fail_free_vfs_inode;
640
641 ip = GFS2_I(inode);
642 error = gfs2_rs_alloc(ip);
643 if (error)
644 goto fail_free_acls;
645
646 inode->i_mode = mode;
647 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
648 inode->i_rdev = dev;
649 inode->i_size = size;
650 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
651 gfs2_set_inode_blocks(inode, 1);
652 munge_mode_uid_gid(dip, inode);
653 ip->i_goal = dip->i_goal;
654 ip->i_diskflags = 0;
655 ip->i_eattr = 0;
656 ip->i_height = 0;
657 ip->i_depth = 0;
658 ip->i_entries = 0;
659
660 switch(mode & S_IFMT) {
661 case S_IFREG:
662 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
663 gfs2_tune_get(sdp, gt_new_files_jdata))
664 ip->i_diskflags |= GFS2_DIF_JDATA;
665 gfs2_set_aops(inode);
666 break;
667 case S_IFDIR:
668 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
669 ip->i_diskflags |= GFS2_DIF_JDATA;
670 ip->i_entries = 2;
671 break;
672 }
673 gfs2_set_inode_flags(inode);
674
675 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) ||
676 (dip->i_diskflags & GFS2_DIF_TOPDIR))
677 aflags |= GFS2_AF_ORLOV;
678
679 error = alloc_dinode(ip, aflags);
680 if (error)
681 goto fail_free_inode;
682
683 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
684 if (error)
685 goto fail_free_inode;
686
687 ip->i_gl->gl_object = ip;
688 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
689 if (error)
690 goto fail_free_inode;
691
692 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
693 if (error)
694 goto fail_gunlock2;
695
696 init_dinode(dip, ip, symname);
697 gfs2_trans_end(sdp);
698
699 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
700 if (error)
701 goto fail_gunlock2;
702
703 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
704 if (error)
705 goto fail_gunlock2;
706
707 ip->i_iopen_gh.gh_gl->gl_object = ip;
708 gfs2_glock_put(io_gl);
709 gfs2_set_iop(inode);
710 insert_inode_hash(inode);
711
712 if (default_acl) {
713 error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
714 posix_acl_release(default_acl);
715 }
716 if (acl) {
717 if (!error)
718 error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
719 posix_acl_release(acl);
720 }
721
722 if (error)
723 goto fail_gunlock3;
724
725 error = gfs2_security_init(dip, ip, name);
726 if (error)
727 goto fail_gunlock3;
728
729 error = link_dinode(dip, name, ip, &da);
730 if (error)
731 goto fail_gunlock3;
732
733 mark_inode_dirty(inode);
734 d_instantiate(dentry, inode);
735 if (file) {
736 *opened |= FILE_CREATED;
737 error = finish_open(file, dentry, gfs2_open_common, opened);
738 }
739 gfs2_glock_dq_uninit(ghs);
740 gfs2_glock_dq_uninit(ghs + 1);
741 return error;
742
743 fail_gunlock3:
744 gfs2_glock_dq_uninit(ghs + 1);
745 if (ip->i_gl)
746 gfs2_glock_put(ip->i_gl);
747 goto fail_gunlock;
748
749 fail_gunlock2:
750 gfs2_glock_dq_uninit(ghs + 1);
751 fail_free_inode:
752 if (ip->i_gl)
753 gfs2_glock_put(ip->i_gl);
754 gfs2_rs_delete(ip, NULL);
755 fail_free_acls:
756 if (default_acl)
757 posix_acl_release(default_acl);
758 if (acl)
759 posix_acl_release(acl);
760 fail_free_vfs_inode:
761 free_inode_nonrcu(inode);
762 inode = NULL;
763 fail_gunlock:
764 gfs2_dir_no_add(&da);
765 gfs2_glock_dq_uninit(ghs);
766 if (inode && !IS_ERR(inode)) {
767 clear_nlink(inode);
768 mark_inode_dirty(inode);
769 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags);
770 iput(inode);
771 }
772 fail:
773 return error;
774 }
775
776 /**
777 * gfs2_create - Create a file
778 * @dir: The directory in which to create the file
779 * @dentry: The dentry of the new file
780 * @mode: The mode of the new file
781 *
782 * Returns: errno
783 */
784
785 static int gfs2_create(struct inode *dir, struct dentry *dentry,
786 umode_t mode, bool excl)
787 {
788 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
789 }
790
791 /**
792 * __gfs2_lookup - Look up a filename in a directory and return its inode
793 * @dir: The directory inode
794 * @dentry: The dentry of the new inode
795 * @file: File to be opened
796 * @opened: atomic_open flags
797 *
798 *
799 * Returns: errno
800 */
801
802 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
803 struct file *file, int *opened)
804 {
805 struct inode *inode;
806 struct dentry *d;
807 struct gfs2_holder gh;
808 struct gfs2_glock *gl;
809 int error;
810
811 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
812 if (!inode)
813 return NULL;
814 if (IS_ERR(inode))
815 return ERR_CAST(inode);
816
817 gl = GFS2_I(inode)->i_gl;
818 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
819 if (error) {
820 iput(inode);
821 return ERR_PTR(error);
822 }
823
824 d = d_splice_alias(inode, dentry);
825 if (IS_ERR(d)) {
826 iput(inode);
827 gfs2_glock_dq_uninit(&gh);
828 return d;
829 }
830 if (file && S_ISREG(inode->i_mode))
831 error = finish_open(file, dentry, gfs2_open_common, opened);
832
833 gfs2_glock_dq_uninit(&gh);
834 if (error) {
835 dput(d);
836 return ERR_PTR(error);
837 }
838 return d;
839 }
840
841 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
842 unsigned flags)
843 {
844 return __gfs2_lookup(dir, dentry, NULL, NULL);
845 }
846
847 /**
848 * gfs2_link - Link to a file
849 * @old_dentry: The inode to link
850 * @dir: Add link to this directory
851 * @dentry: The name of the link
852 *
853 * Link the inode in "old_dentry" into the directory "dir" with the
854 * name in "dentry".
855 *
856 * Returns: errno
857 */
858
859 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
860 struct dentry *dentry)
861 {
862 struct gfs2_inode *dip = GFS2_I(dir);
863 struct gfs2_sbd *sdp = GFS2_SB(dir);
864 struct inode *inode = old_dentry->d_inode;
865 struct gfs2_inode *ip = GFS2_I(inode);
866 struct gfs2_holder ghs[2];
867 struct buffer_head *dibh;
868 struct gfs2_diradd da = { .bh = NULL, };
869 int error;
870
871 if (S_ISDIR(inode->i_mode))
872 return -EPERM;
873
874 error = gfs2_rs_alloc(dip);
875 if (error)
876 return error;
877
878 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
879 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
880
881 error = gfs2_glock_nq(ghs); /* parent */
882 if (error)
883 goto out_parent;
884
885 error = gfs2_glock_nq(ghs + 1); /* child */
886 if (error)
887 goto out_child;
888
889 error = -ENOENT;
890 if (inode->i_nlink == 0)
891 goto out_gunlock;
892
893 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
894 if (error)
895 goto out_gunlock;
896
897 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
898 switch (error) {
899 case -ENOENT:
900 break;
901 case 0:
902 error = -EEXIST;
903 default:
904 goto out_gunlock;
905 }
906
907 error = -EINVAL;
908 if (!dip->i_inode.i_nlink)
909 goto out_gunlock;
910 error = -EFBIG;
911 if (dip->i_entries == (u32)-1)
912 goto out_gunlock;
913 error = -EPERM;
914 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
915 goto out_gunlock;
916 error = -EINVAL;
917 if (!ip->i_inode.i_nlink)
918 goto out_gunlock;
919 error = -EMLINK;
920 if (ip->i_inode.i_nlink == (u32)-1)
921 goto out_gunlock;
922
923 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
924 if (error < 0)
925 goto out_gunlock;
926
927 if (da.nr_blocks) {
928 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
929 error = gfs2_quota_lock_check(dip);
930 if (error)
931 goto out_gunlock;
932
933 error = gfs2_inplace_reserve(dip, &ap);
934 if (error)
935 goto out_gunlock_q;
936
937 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
938 if (error)
939 goto out_ipres;
940 } else {
941 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
942 if (error)
943 goto out_ipres;
944 }
945
946 error = gfs2_meta_inode_buffer(ip, &dibh);
947 if (error)
948 goto out_end_trans;
949
950 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
951 if (error)
952 goto out_brelse;
953
954 gfs2_trans_add_meta(ip->i_gl, dibh);
955 inc_nlink(&ip->i_inode);
956 ip->i_inode.i_ctime = CURRENT_TIME;
957 ihold(inode);
958 d_instantiate(dentry, inode);
959 mark_inode_dirty(inode);
960
961 out_brelse:
962 brelse(dibh);
963 out_end_trans:
964 gfs2_trans_end(sdp);
965 out_ipres:
966 if (da.nr_blocks)
967 gfs2_inplace_release(dip);
968 out_gunlock_q:
969 if (da.nr_blocks)
970 gfs2_quota_unlock(dip);
971 out_gunlock:
972 gfs2_dir_no_add(&da);
973 gfs2_glock_dq(ghs + 1);
974 out_child:
975 gfs2_glock_dq(ghs);
976 out_parent:
977 gfs2_holder_uninit(ghs);
978 gfs2_holder_uninit(ghs + 1);
979 return error;
980 }
981
982 /*
983 * gfs2_unlink_ok - check to see that a inode is still in a directory
984 * @dip: the directory
985 * @name: the name of the file
986 * @ip: the inode
987 *
988 * Assumes that the lock on (at least) @dip is held.
989 *
990 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
991 */
992
993 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
994 const struct gfs2_inode *ip)
995 {
996 int error;
997
998 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
999 return -EPERM;
1000
1001 if ((dip->i_inode.i_mode & S_ISVTX) &&
1002 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1003 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1004 return -EPERM;
1005
1006 if (IS_APPEND(&dip->i_inode))
1007 return -EPERM;
1008
1009 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1010 if (error)
1011 return error;
1012
1013 error = gfs2_dir_check(&dip->i_inode, name, ip);
1014 if (error)
1015 return error;
1016
1017 return 0;
1018 }
1019
1020 /**
1021 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1022 * @dip: The parent directory
1023 * @name: The name of the entry in the parent directory
1024 * @inode: The inode to be removed
1025 *
1026 * Called with all the locks and in a transaction. This will only be
1027 * called for a directory after it has been checked to ensure it is empty.
1028 *
1029 * Returns: 0 on success, or an error
1030 */
1031
1032 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1033 const struct dentry *dentry)
1034 {
1035 struct inode *inode = dentry->d_inode;
1036 struct gfs2_inode *ip = GFS2_I(inode);
1037 int error;
1038
1039 error = gfs2_dir_del(dip, dentry);
1040 if (error)
1041 return error;
1042
1043 ip->i_entries = 0;
1044 inode->i_ctime = CURRENT_TIME;
1045 if (S_ISDIR(inode->i_mode))
1046 clear_nlink(inode);
1047 else
1048 drop_nlink(inode);
1049 mark_inode_dirty(inode);
1050 if (inode->i_nlink == 0)
1051 gfs2_unlink_di(inode);
1052 return 0;
1053 }
1054
1055
1056 /**
1057 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1058 * @dir: The inode of the directory containing the inode to unlink
1059 * @dentry: The file itself
1060 *
1061 * This routine uses the type of the inode as a flag to figure out
1062 * whether this is an unlink or an rmdir.
1063 *
1064 * Returns: errno
1065 */
1066
1067 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1068 {
1069 struct gfs2_inode *dip = GFS2_I(dir);
1070 struct gfs2_sbd *sdp = GFS2_SB(dir);
1071 struct inode *inode = dentry->d_inode;
1072 struct gfs2_inode *ip = GFS2_I(inode);
1073 struct gfs2_holder ghs[3];
1074 struct gfs2_rgrpd *rgd;
1075 int error;
1076
1077 error = gfs2_rindex_update(sdp);
1078 if (error)
1079 return error;
1080
1081 error = -EROFS;
1082
1083 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1084 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1085
1086 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1087 if (!rgd)
1088 goto out_inodes;
1089
1090 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1091
1092
1093 error = gfs2_glock_nq(ghs); /* parent */
1094 if (error)
1095 goto out_parent;
1096
1097 error = gfs2_glock_nq(ghs + 1); /* child */
1098 if (error)
1099 goto out_child;
1100
1101 error = -ENOENT;
1102 if (inode->i_nlink == 0)
1103 goto out_rgrp;
1104
1105 if (S_ISDIR(inode->i_mode)) {
1106 error = -ENOTEMPTY;
1107 if (ip->i_entries > 2 || inode->i_nlink > 2)
1108 goto out_rgrp;
1109 }
1110
1111 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1112 if (error)
1113 goto out_rgrp;
1114
1115 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1116 if (error)
1117 goto out_gunlock;
1118
1119 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1120 if (error)
1121 goto out_end_trans;
1122
1123 error = gfs2_unlink_inode(dip, dentry);
1124
1125 out_end_trans:
1126 gfs2_trans_end(sdp);
1127 out_gunlock:
1128 gfs2_glock_dq(ghs + 2);
1129 out_rgrp:
1130 gfs2_glock_dq(ghs + 1);
1131 out_child:
1132 gfs2_glock_dq(ghs);
1133 out_parent:
1134 gfs2_holder_uninit(ghs + 2);
1135 out_inodes:
1136 gfs2_holder_uninit(ghs + 1);
1137 gfs2_holder_uninit(ghs);
1138 return error;
1139 }
1140
1141 /**
1142 * gfs2_symlink - Create a symlink
1143 * @dir: The directory to create the symlink in
1144 * @dentry: The dentry to put the symlink in
1145 * @symname: The thing which the link points to
1146 *
1147 * Returns: errno
1148 */
1149
1150 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1151 const char *symname)
1152 {
1153 struct gfs2_sbd *sdp = GFS2_SB(dir);
1154 unsigned int size;
1155
1156 size = strlen(symname);
1157 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1158 return -ENAMETOOLONG;
1159
1160 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1161 }
1162
1163 /**
1164 * gfs2_mkdir - Make a directory
1165 * @dir: The parent directory of the new one
1166 * @dentry: The dentry of the new directory
1167 * @mode: The mode of the new directory
1168 *
1169 * Returns: errno
1170 */
1171
1172 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1173 {
1174 struct gfs2_sbd *sdp = GFS2_SB(dir);
1175 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1176 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1177 }
1178
1179 /**
1180 * gfs2_mknod - Make a special file
1181 * @dir: The directory in which the special file will reside
1182 * @dentry: The dentry of the special file
1183 * @mode: The mode of the special file
1184 * @dev: The device specification of the special file
1185 *
1186 */
1187
1188 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1189 dev_t dev)
1190 {
1191 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1192 }
1193
1194 /**
1195 * gfs2_atomic_open - Atomically open a file
1196 * @dir: The directory
1197 * @dentry: The proposed new entry
1198 * @file: The proposed new struct file
1199 * @flags: open flags
1200 * @mode: File mode
1201 * @opened: Flag to say whether the file has been opened or not
1202 *
1203 * Returns: error code or 0 for success
1204 */
1205
1206 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1207 struct file *file, unsigned flags,
1208 umode_t mode, int *opened)
1209 {
1210 struct dentry *d;
1211 bool excl = !!(flags & O_EXCL);
1212
1213 d = __gfs2_lookup(dir, dentry, file, opened);
1214 if (IS_ERR(d))
1215 return PTR_ERR(d);
1216 if (d != NULL)
1217 dentry = d;
1218 if (dentry->d_inode) {
1219 if (!(*opened & FILE_OPENED)) {
1220 if (d == NULL)
1221 dget(dentry);
1222 return finish_no_open(file, dentry);
1223 }
1224 dput(d);
1225 return 0;
1226 }
1227
1228 BUG_ON(d != NULL);
1229 if (!(flags & O_CREAT))
1230 return -ENOENT;
1231
1232 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1233 }
1234
1235 /*
1236 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1237 * @this: move this
1238 * @to: to here
1239 *
1240 * Follow @to back to the root and make sure we don't encounter @this
1241 * Assumes we already hold the rename lock.
1242 *
1243 * Returns: errno
1244 */
1245
1246 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1247 {
1248 struct inode *dir = &to->i_inode;
1249 struct super_block *sb = dir->i_sb;
1250 struct inode *tmp;
1251 int error = 0;
1252
1253 igrab(dir);
1254
1255 for (;;) {
1256 if (dir == &this->i_inode) {
1257 error = -EINVAL;
1258 break;
1259 }
1260 if (dir == sb->s_root->d_inode) {
1261 error = 0;
1262 break;
1263 }
1264
1265 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1266 if (IS_ERR(tmp)) {
1267 error = PTR_ERR(tmp);
1268 break;
1269 }
1270
1271 iput(dir);
1272 dir = tmp;
1273 }
1274
1275 iput(dir);
1276
1277 return error;
1278 }
1279
1280 /**
1281 * gfs2_rename - Rename a file
1282 * @odir: Parent directory of old file name
1283 * @odentry: The old dentry of the file
1284 * @ndir: Parent directory of new file name
1285 * @ndentry: The new dentry of the file
1286 *
1287 * Returns: errno
1288 */
1289
1290 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1291 struct inode *ndir, struct dentry *ndentry)
1292 {
1293 struct gfs2_inode *odip = GFS2_I(odir);
1294 struct gfs2_inode *ndip = GFS2_I(ndir);
1295 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1296 struct gfs2_inode *nip = NULL;
1297 struct gfs2_sbd *sdp = GFS2_SB(odir);
1298 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1299 struct gfs2_rgrpd *nrgd;
1300 unsigned int num_gh;
1301 int dir_rename = 0;
1302 struct gfs2_diradd da = { .nr_blocks = 0, };
1303 unsigned int x;
1304 int error;
1305
1306 if (ndentry->d_inode) {
1307 nip = GFS2_I(ndentry->d_inode);
1308 if (ip == nip)
1309 return 0;
1310 }
1311
1312 error = gfs2_rindex_update(sdp);
1313 if (error)
1314 return error;
1315
1316 error = gfs2_rs_alloc(ndip);
1317 if (error)
1318 return error;
1319
1320 if (odip != ndip) {
1321 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1322 0, &r_gh);
1323 if (error)
1324 goto out;
1325
1326 if (S_ISDIR(ip->i_inode.i_mode)) {
1327 dir_rename = 1;
1328 /* don't move a dirctory into it's subdir */
1329 error = gfs2_ok_to_move(ip, ndip);
1330 if (error)
1331 goto out_gunlock_r;
1332 }
1333 }
1334
1335 num_gh = 1;
1336 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1337 if (odip != ndip) {
1338 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1339 num_gh++;
1340 }
1341 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1342 num_gh++;
1343
1344 if (nip) {
1345 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1346 num_gh++;
1347 /* grab the resource lock for unlink flag twiddling
1348 * this is the case of the target file already existing
1349 * so we unlink before doing the rename
1350 */
1351 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1352 if (nrgd)
1353 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1354 }
1355
1356 for (x = 0; x < num_gh; x++) {
1357 error = gfs2_glock_nq(ghs + x);
1358 if (error)
1359 goto out_gunlock;
1360 }
1361
1362 error = -ENOENT;
1363 if (ip->i_inode.i_nlink == 0)
1364 goto out_gunlock;
1365
1366 /* Check out the old directory */
1367
1368 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1369 if (error)
1370 goto out_gunlock;
1371
1372 /* Check out the new directory */
1373
1374 if (nip) {
1375 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1376 if (error)
1377 goto out_gunlock;
1378
1379 if (nip->i_inode.i_nlink == 0) {
1380 error = -EAGAIN;
1381 goto out_gunlock;
1382 }
1383
1384 if (S_ISDIR(nip->i_inode.i_mode)) {
1385 if (nip->i_entries < 2) {
1386 gfs2_consist_inode(nip);
1387 error = -EIO;
1388 goto out_gunlock;
1389 }
1390 if (nip->i_entries > 2) {
1391 error = -ENOTEMPTY;
1392 goto out_gunlock;
1393 }
1394 }
1395 } else {
1396 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1397 if (error)
1398 goto out_gunlock;
1399
1400 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1401 switch (error) {
1402 case -ENOENT:
1403 error = 0;
1404 break;
1405 case 0:
1406 error = -EEXIST;
1407 default:
1408 goto out_gunlock;
1409 };
1410
1411 if (odip != ndip) {
1412 if (!ndip->i_inode.i_nlink) {
1413 error = -ENOENT;
1414 goto out_gunlock;
1415 }
1416 if (ndip->i_entries == (u32)-1) {
1417 error = -EFBIG;
1418 goto out_gunlock;
1419 }
1420 if (S_ISDIR(ip->i_inode.i_mode) &&
1421 ndip->i_inode.i_nlink == (u32)-1) {
1422 error = -EMLINK;
1423 goto out_gunlock;
1424 }
1425 }
1426 }
1427
1428 /* Check out the dir to be renamed */
1429
1430 if (dir_rename) {
1431 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1432 if (error)
1433 goto out_gunlock;
1434 }
1435
1436 if (nip == NULL) {
1437 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1438 if (error)
1439 goto out_gunlock;
1440 }
1441
1442 if (da.nr_blocks) {
1443 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1444 error = gfs2_quota_lock_check(ndip);
1445 if (error)
1446 goto out_gunlock;
1447
1448 error = gfs2_inplace_reserve(ndip, &ap);
1449 if (error)
1450 goto out_gunlock_q;
1451
1452 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1453 4 * RES_LEAF + 4, 0);
1454 if (error)
1455 goto out_ipreserv;
1456 } else {
1457 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1458 5 * RES_LEAF + 4, 0);
1459 if (error)
1460 goto out_gunlock;
1461 }
1462
1463 /* Remove the target file, if it exists */
1464
1465 if (nip)
1466 error = gfs2_unlink_inode(ndip, ndentry);
1467
1468 if (dir_rename) {
1469 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1470 if (error)
1471 goto out_end_trans;
1472 } else {
1473 struct buffer_head *dibh;
1474 error = gfs2_meta_inode_buffer(ip, &dibh);
1475 if (error)
1476 goto out_end_trans;
1477 ip->i_inode.i_ctime = CURRENT_TIME;
1478 gfs2_trans_add_meta(ip->i_gl, dibh);
1479 gfs2_dinode_out(ip, dibh->b_data);
1480 brelse(dibh);
1481 }
1482
1483 error = gfs2_dir_del(odip, odentry);
1484 if (error)
1485 goto out_end_trans;
1486
1487 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1488 if (error)
1489 goto out_end_trans;
1490
1491 out_end_trans:
1492 gfs2_trans_end(sdp);
1493 out_ipreserv:
1494 if (da.nr_blocks)
1495 gfs2_inplace_release(ndip);
1496 out_gunlock_q:
1497 if (da.nr_blocks)
1498 gfs2_quota_unlock(ndip);
1499 out_gunlock:
1500 gfs2_dir_no_add(&da);
1501 while (x--) {
1502 gfs2_glock_dq(ghs + x);
1503 gfs2_holder_uninit(ghs + x);
1504 }
1505 out_gunlock_r:
1506 if (r_gh.gh_gl)
1507 gfs2_glock_dq_uninit(&r_gh);
1508 out:
1509 return error;
1510 }
1511
1512 /**
1513 * gfs2_follow_link - Follow a symbolic link
1514 * @dentry: The dentry of the link
1515 * @nd: Data that we pass to vfs_follow_link()
1516 *
1517 * This can handle symlinks of any size.
1518 *
1519 * Returns: 0 on success or error code
1520 */
1521
1522 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1523 {
1524 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1525 struct gfs2_holder i_gh;
1526 struct buffer_head *dibh;
1527 unsigned int size;
1528 char *buf;
1529 int error;
1530
1531 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1532 error = gfs2_glock_nq(&i_gh);
1533 if (error) {
1534 gfs2_holder_uninit(&i_gh);
1535 nd_set_link(nd, ERR_PTR(error));
1536 return NULL;
1537 }
1538
1539 size = (unsigned int)i_size_read(&ip->i_inode);
1540 if (size == 0) {
1541 gfs2_consist_inode(ip);
1542 buf = ERR_PTR(-EIO);
1543 goto out;
1544 }
1545
1546 error = gfs2_meta_inode_buffer(ip, &dibh);
1547 if (error) {
1548 buf = ERR_PTR(error);
1549 goto out;
1550 }
1551
1552 buf = kzalloc(size + 1, GFP_NOFS);
1553 if (!buf)
1554 buf = ERR_PTR(-ENOMEM);
1555 else
1556 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1557 brelse(dibh);
1558 out:
1559 gfs2_glock_dq_uninit(&i_gh);
1560 nd_set_link(nd, buf);
1561 return NULL;
1562 }
1563
1564 /**
1565 * gfs2_permission -
1566 * @inode: The inode
1567 * @mask: The mask to be tested
1568 * @flags: Indicates whether this is an RCU path walk or not
1569 *
1570 * This may be called from the VFS directly, or from within GFS2 with the
1571 * inode locked, so we look to see if the glock is already locked and only
1572 * lock the glock if its not already been done.
1573 *
1574 * Returns: errno
1575 */
1576
1577 int gfs2_permission(struct inode *inode, int mask)
1578 {
1579 struct gfs2_inode *ip;
1580 struct gfs2_holder i_gh;
1581 int error;
1582 int unlock = 0;
1583
1584
1585 ip = GFS2_I(inode);
1586 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1587 if (mask & MAY_NOT_BLOCK)
1588 return -ECHILD;
1589 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1590 if (error)
1591 return error;
1592 unlock = 1;
1593 }
1594
1595 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1596 error = -EACCES;
1597 else
1598 error = generic_permission(inode, mask);
1599 if (unlock)
1600 gfs2_glock_dq_uninit(&i_gh);
1601
1602 return error;
1603 }
1604
1605 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1606 {
1607 setattr_copy(inode, attr);
1608 mark_inode_dirty(inode);
1609 return 0;
1610 }
1611
1612 /**
1613 * gfs2_setattr_simple -
1614 * @ip:
1615 * @attr:
1616 *
1617 * Returns: errno
1618 */
1619
1620 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1621 {
1622 int error;
1623
1624 if (current->journal_info)
1625 return __gfs2_setattr_simple(inode, attr);
1626
1627 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1628 if (error)
1629 return error;
1630
1631 error = __gfs2_setattr_simple(inode, attr);
1632 gfs2_trans_end(GFS2_SB(inode));
1633 return error;
1634 }
1635
1636 static int setattr_chown(struct inode *inode, struct iattr *attr)
1637 {
1638 struct gfs2_inode *ip = GFS2_I(inode);
1639 struct gfs2_sbd *sdp = GFS2_SB(inode);
1640 kuid_t ouid, nuid;
1641 kgid_t ogid, ngid;
1642 int error;
1643
1644 ouid = inode->i_uid;
1645 ogid = inode->i_gid;
1646 nuid = attr->ia_uid;
1647 ngid = attr->ia_gid;
1648
1649 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1650 ouid = nuid = NO_UID_QUOTA_CHANGE;
1651 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1652 ogid = ngid = NO_GID_QUOTA_CHANGE;
1653
1654 error = get_write_access(inode);
1655 if (error)
1656 return error;
1657
1658 error = gfs2_rs_alloc(ip);
1659 if (error)
1660 goto out;
1661
1662 error = gfs2_rindex_update(sdp);
1663 if (error)
1664 goto out;
1665
1666 error = gfs2_quota_lock(ip, nuid, ngid);
1667 if (error)
1668 goto out;
1669
1670 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1671 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1672 error = gfs2_quota_check(ip, nuid, ngid);
1673 if (error)
1674 goto out_gunlock_q;
1675 }
1676
1677 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1678 if (error)
1679 goto out_gunlock_q;
1680
1681 error = gfs2_setattr_simple(inode, attr);
1682 if (error)
1683 goto out_end_trans;
1684
1685 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1686 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1687 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1688 gfs2_quota_change(ip, -blocks, ouid, ogid);
1689 gfs2_quota_change(ip, blocks, nuid, ngid);
1690 }
1691
1692 out_end_trans:
1693 gfs2_trans_end(sdp);
1694 out_gunlock_q:
1695 gfs2_quota_unlock(ip);
1696 out:
1697 put_write_access(inode);
1698 return error;
1699 }
1700
1701 /**
1702 * gfs2_setattr - Change attributes on an inode
1703 * @dentry: The dentry which is changing
1704 * @attr: The structure describing the change
1705 *
1706 * The VFS layer wants to change one or more of an inodes attributes. Write
1707 * that change out to disk.
1708 *
1709 * Returns: errno
1710 */
1711
1712 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1713 {
1714 struct inode *inode = dentry->d_inode;
1715 struct gfs2_inode *ip = GFS2_I(inode);
1716 struct gfs2_holder i_gh;
1717 int error;
1718
1719 error = gfs2_rs_alloc(ip);
1720 if (error)
1721 return error;
1722
1723 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1724 if (error)
1725 return error;
1726
1727 error = -EPERM;
1728 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1729 goto out;
1730
1731 error = inode_change_ok(inode, attr);
1732 if (error)
1733 goto out;
1734
1735 if (attr->ia_valid & ATTR_SIZE)
1736 error = gfs2_setattr_size(inode, attr->ia_size);
1737 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1738 error = setattr_chown(inode, attr);
1739 else {
1740 error = gfs2_setattr_simple(inode, attr);
1741 if (!error && attr->ia_valid & ATTR_MODE)
1742 error = posix_acl_chmod(inode, inode->i_mode);
1743 }
1744
1745 out:
1746 if (!error)
1747 mark_inode_dirty(inode);
1748 gfs2_glock_dq_uninit(&i_gh);
1749 return error;
1750 }
1751
1752 /**
1753 * gfs2_getattr - Read out an inode's attributes
1754 * @mnt: The vfsmount the inode is being accessed from
1755 * @dentry: The dentry to stat
1756 * @stat: The inode's stats
1757 *
1758 * This may be called from the VFS directly, or from within GFS2 with the
1759 * inode locked, so we look to see if the glock is already locked and only
1760 * lock the glock if its not already been done. Note that its the NFS
1761 * readdirplus operation which causes this to be called (from filldir)
1762 * with the glock already held.
1763 *
1764 * Returns: errno
1765 */
1766
1767 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1768 struct kstat *stat)
1769 {
1770 struct inode *inode = dentry->d_inode;
1771 struct gfs2_inode *ip = GFS2_I(inode);
1772 struct gfs2_holder gh;
1773 int error;
1774 int unlock = 0;
1775
1776 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1777 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1778 if (error)
1779 return error;
1780 unlock = 1;
1781 }
1782
1783 generic_fillattr(inode, stat);
1784 if (unlock)
1785 gfs2_glock_dq_uninit(&gh);
1786
1787 return 0;
1788 }
1789
1790 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1791 const void *data, size_t size, int flags)
1792 {
1793 struct inode *inode = dentry->d_inode;
1794 struct gfs2_inode *ip = GFS2_I(inode);
1795 struct gfs2_holder gh;
1796 int ret;
1797
1798 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1799 ret = gfs2_glock_nq(&gh);
1800 if (ret == 0) {
1801 ret = gfs2_rs_alloc(ip);
1802 if (ret == 0)
1803 ret = generic_setxattr(dentry, name, data, size, flags);
1804 gfs2_glock_dq(&gh);
1805 }
1806 gfs2_holder_uninit(&gh);
1807 return ret;
1808 }
1809
1810 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1811 void *data, size_t size)
1812 {
1813 struct inode *inode = dentry->d_inode;
1814 struct gfs2_inode *ip = GFS2_I(inode);
1815 struct gfs2_holder gh;
1816 int ret;
1817
1818 /* For selinux during lookup */
1819 if (gfs2_glock_is_locked_by_me(ip->i_gl))
1820 return generic_getxattr(dentry, name, data, size);
1821
1822 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1823 ret = gfs2_glock_nq(&gh);
1824 if (ret == 0) {
1825 ret = generic_getxattr(dentry, name, data, size);
1826 gfs2_glock_dq(&gh);
1827 }
1828 gfs2_holder_uninit(&gh);
1829 return ret;
1830 }
1831
1832 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1833 {
1834 struct inode *inode = dentry->d_inode;
1835 struct gfs2_inode *ip = GFS2_I(inode);
1836 struct gfs2_holder gh;
1837 int ret;
1838
1839 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1840 ret = gfs2_glock_nq(&gh);
1841 if (ret == 0) {
1842 ret = gfs2_rs_alloc(ip);
1843 if (ret == 0)
1844 ret = generic_removexattr(dentry, name);
1845 gfs2_glock_dq(&gh);
1846 }
1847 gfs2_holder_uninit(&gh);
1848 return ret;
1849 }
1850
1851 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1852 u64 start, u64 len)
1853 {
1854 struct gfs2_inode *ip = GFS2_I(inode);
1855 struct gfs2_holder gh;
1856 int ret;
1857
1858 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1859 if (ret)
1860 return ret;
1861
1862 mutex_lock(&inode->i_mutex);
1863
1864 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1865 if (ret)
1866 goto out;
1867
1868 if (gfs2_is_stuffed(ip)) {
1869 u64 phys = ip->i_no_addr << inode->i_blkbits;
1870 u64 size = i_size_read(inode);
1871 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1872 FIEMAP_EXTENT_DATA_INLINE;
1873 phys += sizeof(struct gfs2_dinode);
1874 phys += start;
1875 if (start + len > size)
1876 len = size - start;
1877 if (start < size)
1878 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1879 len, flags);
1880 if (ret == 1)
1881 ret = 0;
1882 } else {
1883 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1884 gfs2_block_map);
1885 }
1886
1887 gfs2_glock_dq_uninit(&gh);
1888 out:
1889 mutex_unlock(&inode->i_mutex);
1890 return ret;
1891 }
1892
1893 const struct inode_operations gfs2_file_iops = {
1894 .permission = gfs2_permission,
1895 .setattr = gfs2_setattr,
1896 .getattr = gfs2_getattr,
1897 .setxattr = gfs2_setxattr,
1898 .getxattr = gfs2_getxattr,
1899 .listxattr = gfs2_listxattr,
1900 .removexattr = gfs2_removexattr,
1901 .fiemap = gfs2_fiemap,
1902 .get_acl = gfs2_get_acl,
1903 .set_acl = gfs2_set_acl,
1904 };
1905
1906 const struct inode_operations gfs2_dir_iops = {
1907 .create = gfs2_create,
1908 .lookup = gfs2_lookup,
1909 .link = gfs2_link,
1910 .unlink = gfs2_unlink,
1911 .symlink = gfs2_symlink,
1912 .mkdir = gfs2_mkdir,
1913 .rmdir = gfs2_unlink,
1914 .mknod = gfs2_mknod,
1915 .rename = gfs2_rename,
1916 .permission = gfs2_permission,
1917 .setattr = gfs2_setattr,
1918 .getattr = gfs2_getattr,
1919 .setxattr = gfs2_setxattr,
1920 .getxattr = gfs2_getxattr,
1921 .listxattr = gfs2_listxattr,
1922 .removexattr = gfs2_removexattr,
1923 .fiemap = gfs2_fiemap,
1924 .get_acl = gfs2_get_acl,
1925 .set_acl = gfs2_set_acl,
1926 .atomic_open = gfs2_atomic_open,
1927 };
1928
1929 const struct inode_operations gfs2_symlink_iops = {
1930 .readlink = generic_readlink,
1931 .follow_link = gfs2_follow_link,
1932 .put_link = kfree_put_link,
1933 .permission = gfs2_permission,
1934 .setattr = gfs2_setattr,
1935 .getattr = gfs2_getattr,
1936 .setxattr = gfs2_setxattr,
1937 .getxattr = gfs2_getxattr,
1938 .listxattr = gfs2_listxattr,
1939 .removexattr = gfs2_removexattr,
1940 .fiemap = gfs2_fiemap,
1941 };
1942
Linux kernel - Deliverables
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