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Merge remote-tracking branch 'spi/for-next'
[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 static int iget_test(struct inode *inode, void *opaque)
41 {
42 u64 no_addr = *(u64 *)opaque;
43
44 return GFS2_I(inode)->i_no_addr == no_addr;
45 }
46
47 static int iget_set(struct inode *inode, void *opaque)
48 {
49 u64 no_addr = *(u64 *)opaque;
50
51 GFS2_I(inode)->i_no_addr = no_addr;
52 inode->i_ino = no_addr;
53 return 0;
54 }
55
56 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
57 {
58 struct inode *inode;
59
60 repeat:
61 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
62 if (!inode)
63 return inode;
64 if (is_bad_inode(inode)) {
65 iput(inode);
66 goto repeat;
67 }
68 return inode;
69 }
70
71 /**
72 * gfs2_set_iop - Sets inode operations
73 * @inode: The inode with correct i_mode filled in
74 *
75 * GFS2 lookup code fills in vfs inode contents based on info obtained
76 * from directory entry inside gfs2_inode_lookup().
77 */
78
79 static void gfs2_set_iop(struct inode *inode)
80 {
81 struct gfs2_sbd *sdp = GFS2_SB(inode);
82 umode_t mode = inode->i_mode;
83
84 if (S_ISREG(mode)) {
85 inode->i_op = &gfs2_file_iops;
86 if (gfs2_localflocks(sdp))
87 inode->i_fop = &gfs2_file_fops_nolock;
88 else
89 inode->i_fop = &gfs2_file_fops;
90 } else if (S_ISDIR(mode)) {
91 inode->i_op = &gfs2_dir_iops;
92 if (gfs2_localflocks(sdp))
93 inode->i_fop = &gfs2_dir_fops_nolock;
94 else
95 inode->i_fop = &gfs2_dir_fops;
96 } else if (S_ISLNK(mode)) {
97 inode->i_op = &gfs2_symlink_iops;
98 } else {
99 inode->i_op = &gfs2_file_iops;
100 init_special_inode(inode, inode->i_mode, inode->i_rdev);
101 }
102 }
103
104 /**
105 * gfs2_inode_lookup - Lookup an inode
106 * @sb: The super block
107 * @type: The type of the inode
108 * @no_addr: The inode number
109 * @no_formal_ino: The inode generation number
110 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
111 * GFS2_BLKST_FREE do indicate not to verify)
112 *
113 * If @type is DT_UNKNOWN, the inode type is fetched from disk.
114 *
115 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
116 * placeholder because it doesn't otherwise make sense), the on-disk block type
117 * is verified to be @blktype.
118 *
119 * Returns: A VFS inode, or an error
120 */
121
122 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
123 u64 no_addr, u64 no_formal_ino,
124 unsigned int blktype)
125 {
126 struct inode *inode;
127 struct gfs2_inode *ip;
128 struct gfs2_glock *io_gl = NULL;
129 struct gfs2_holder i_gh;
130 int error;
131
132 gfs2_holder_mark_uninitialized(&i_gh);
133 inode = gfs2_iget(sb, no_addr);
134 if (!inode)
135 return ERR_PTR(-ENOMEM);
136
137 ip = GFS2_I(inode);
138
139 if (inode->i_state & I_NEW) {
140 struct gfs2_sbd *sdp = GFS2_SB(inode);
141 ip->i_no_formal_ino = no_formal_ino;
142
143 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
144 if (unlikely(error))
145 goto fail;
146 ip->i_gl->gl_object = ip;
147
148 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
149 if (unlikely(error))
150 goto fail_put;
151
152 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
153 /*
154 * The GL_SKIP flag indicates to skip reading the inode
155 * block. We read the inode with gfs2_inode_refresh
156 * after possibly checking the block type.
157 */
158 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
159 GL_SKIP, &i_gh);
160 if (error)
161 goto fail_put;
162
163 if (blktype != GFS2_BLKST_FREE) {
164 error = gfs2_check_blk_type(sdp, no_addr,
165 blktype);
166 if (error)
167 goto fail_put;
168 }
169 }
170
171 set_bit(GIF_INVALID, &ip->i_flags);
172 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
173 if (unlikely(error))
174 goto fail_put;
175
176 ip->i_iopen_gh.gh_gl->gl_object = ip;
177 gfs2_glock_put(io_gl);
178 io_gl = NULL;
179
180 if (type == DT_UNKNOWN) {
181 /* Inode glock must be locked already */
182 error = gfs2_inode_refresh(GFS2_I(inode));
183 if (error)
184 goto fail_refresh;
185 } else {
186 inode->i_mode = DT2IF(type);
187 }
188
189 gfs2_set_iop(inode);
190 unlock_new_inode(inode);
191 }
192
193 if (gfs2_holder_initialized(&i_gh))
194 gfs2_glock_dq_uninit(&i_gh);
195 return inode;
196
197 fail_refresh:
198 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
199 ip->i_iopen_gh.gh_gl->gl_object = NULL;
200 gfs2_glock_dq_wait(&ip->i_iopen_gh);
201 gfs2_holder_uninit(&ip->i_iopen_gh);
202 fail_put:
203 if (io_gl)
204 gfs2_glock_put(io_gl);
205 if (gfs2_holder_initialized(&i_gh))
206 gfs2_glock_dq_uninit(&i_gh);
207 ip->i_gl->gl_object = NULL;
208 fail:
209 iget_failed(inode);
210 return ERR_PTR(error);
211 }
212
213 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
214 u64 *no_formal_ino, unsigned int blktype)
215 {
216 struct super_block *sb = sdp->sd_vfs;
217 struct inode *inode;
218 int error;
219
220 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, blktype);
221 if (IS_ERR(inode))
222 return inode;
223
224 /* Two extra checks for NFS only */
225 if (no_formal_ino) {
226 error = -ESTALE;
227 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
228 goto fail_iput;
229
230 error = -EIO;
231 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
232 goto fail_iput;
233 }
234 return inode;
235
236 fail_iput:
237 iput(inode);
238 return ERR_PTR(error);
239 }
240
241
242 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
243 {
244 struct qstr qstr;
245 struct inode *inode;
246 gfs2_str2qstr(&qstr, name);
247 inode = gfs2_lookupi(dip, &qstr, 1);
248 /* gfs2_lookupi has inconsistent callers: vfs
249 * related routines expect NULL for no entry found,
250 * gfs2_lookup_simple callers expect ENOENT
251 * and do not check for NULL.
252 */
253 if (inode == NULL)
254 return ERR_PTR(-ENOENT);
255 else
256 return inode;
257 }
258
259
260 /**
261 * gfs2_lookupi - Look up a filename in a directory and return its inode
262 * @d_gh: An initialized holder for the directory glock
263 * @name: The name of the inode to look for
264 * @is_root: If 1, ignore the caller's permissions
265 * @i_gh: An uninitialized holder for the new inode glock
266 *
267 * This can be called via the VFS filldir function when NFS is doing
268 * a readdirplus and the inode which its intending to stat isn't
269 * already in cache. In this case we must not take the directory glock
270 * again, since the readdir call will have already taken that lock.
271 *
272 * Returns: errno
273 */
274
275 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
276 int is_root)
277 {
278 struct super_block *sb = dir->i_sb;
279 struct gfs2_inode *dip = GFS2_I(dir);
280 struct gfs2_holder d_gh;
281 int error = 0;
282 struct inode *inode = NULL;
283
284 gfs2_holder_mark_uninitialized(&d_gh);
285 if (!name->len || name->len > GFS2_FNAMESIZE)
286 return ERR_PTR(-ENAMETOOLONG);
287
288 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
289 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
290 dir == d_inode(sb->s_root))) {
291 igrab(dir);
292 return dir;
293 }
294
295 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
296 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
297 if (error)
298 return ERR_PTR(error);
299 }
300
301 if (!is_root) {
302 error = gfs2_permission(dir, MAY_EXEC);
303 if (error)
304 goto out;
305 }
306
307 inode = gfs2_dir_search(dir, name, false);
308 if (IS_ERR(inode))
309 error = PTR_ERR(inode);
310 out:
311 if (gfs2_holder_initialized(&d_gh))
312 gfs2_glock_dq_uninit(&d_gh);
313 if (error == -ENOENT)
314 return NULL;
315 return inode ? inode : ERR_PTR(error);
316 }
317
318 /**
319 * create_ok - OK to create a new on-disk inode here?
320 * @dip: Directory in which dinode is to be created
321 * @name: Name of new dinode
322 * @mode:
323 *
324 * Returns: errno
325 */
326
327 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
328 umode_t mode)
329 {
330 int error;
331
332 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
333 if (error)
334 return error;
335
336 /* Don't create entries in an unlinked directory */
337 if (!dip->i_inode.i_nlink)
338 return -ENOENT;
339
340 if (dip->i_entries == (u32)-1)
341 return -EFBIG;
342 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
343 return -EMLINK;
344
345 return 0;
346 }
347
348 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
349 struct inode *inode)
350 {
351 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
352 (dip->i_inode.i_mode & S_ISUID) &&
353 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
354 if (S_ISDIR(inode->i_mode))
355 inode->i_mode |= S_ISUID;
356 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
357 inode->i_mode &= ~07111;
358 inode->i_uid = dip->i_inode.i_uid;
359 } else
360 inode->i_uid = current_fsuid();
361
362 if (dip->i_inode.i_mode & S_ISGID) {
363 if (S_ISDIR(inode->i_mode))
364 inode->i_mode |= S_ISGID;
365 inode->i_gid = dip->i_inode.i_gid;
366 } else
367 inode->i_gid = current_fsgid();
368 }
369
370 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
371 {
372 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
373 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
374 int error;
375
376 error = gfs2_quota_lock_check(ip, &ap);
377 if (error)
378 goto out;
379
380 error = gfs2_inplace_reserve(ip, &ap);
381 if (error)
382 goto out_quota;
383
384 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
385 if (error)
386 goto out_ipreserv;
387
388 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
389 ip->i_no_formal_ino = ip->i_generation;
390 ip->i_inode.i_ino = ip->i_no_addr;
391 ip->i_goal = ip->i_no_addr;
392
393 gfs2_trans_end(sdp);
394
395 out_ipreserv:
396 gfs2_inplace_release(ip);
397 out_quota:
398 gfs2_quota_unlock(ip);
399 out:
400 return error;
401 }
402
403 static void gfs2_init_dir(struct buffer_head *dibh,
404 const struct gfs2_inode *parent)
405 {
406 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
407 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
408
409 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
410 dent->de_inum = di->di_num; /* already GFS2 endian */
411 dent->de_type = cpu_to_be16(DT_DIR);
412
413 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
414 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
415 gfs2_inum_out(parent, dent);
416 dent->de_type = cpu_to_be16(DT_DIR);
417
418 }
419
420 /**
421 * gfs2_init_xattr - Initialise an xattr block for a new inode
422 * @ip: The inode in question
423 *
424 * This sets up an empty xattr block for a new inode, ready to
425 * take any ACLs, LSM xattrs, etc.
426 */
427
428 static void gfs2_init_xattr(struct gfs2_inode *ip)
429 {
430 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
431 struct buffer_head *bh;
432 struct gfs2_ea_header *ea;
433
434 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
435 gfs2_trans_add_meta(ip->i_gl, bh);
436 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
437 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
438
439 ea = GFS2_EA_BH2FIRST(bh);
440 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
441 ea->ea_type = GFS2_EATYPE_UNUSED;
442 ea->ea_flags = GFS2_EAFLAG_LAST;
443
444 brelse(bh);
445 }
446
447 /**
448 * init_dinode - Fill in a new dinode structure
449 * @dip: The directory this inode is being created in
450 * @ip: The inode
451 * @symname: The symlink destination (if a symlink)
452 * @bhp: The buffer head (returned to caller)
453 *
454 */
455
456 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
457 const char *symname)
458 {
459 struct gfs2_dinode *di;
460 struct buffer_head *dibh;
461
462 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
463 gfs2_trans_add_meta(ip->i_gl, dibh);
464 di = (struct gfs2_dinode *)dibh->b_data;
465 gfs2_dinode_out(ip, di);
466
467 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
468 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
469 di->__pad1 = 0;
470 di->__pad2 = 0;
471 di->__pad3 = 0;
472 memset(&di->__pad4, 0, sizeof(di->__pad4));
473 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
474 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
475
476 switch(ip->i_inode.i_mode & S_IFMT) {
477 case S_IFDIR:
478 gfs2_init_dir(dibh, dip);
479 break;
480 case S_IFLNK:
481 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
482 break;
483 }
484
485 set_buffer_uptodate(dibh);
486 brelse(dibh);
487 }
488
489 /**
490 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
491 * @dip: The directory we are linking into
492 * @da: The dir add information
493 * @nr_inodes: The number of inodes involved
494 *
495 * This calculate the number of blocks we need to reserve in a
496 * transaction to link @nr_inodes into a directory. In most cases
497 * @nr_inodes will be 2 (the directory plus the inode being linked in)
498 * but in case of rename, 4 may be required.
499 *
500 * Returns: Number of blocks
501 */
502
503 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
504 const struct gfs2_diradd *da,
505 unsigned nr_inodes)
506 {
507 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
508 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
509 }
510
511 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
512 struct gfs2_inode *ip, struct gfs2_diradd *da)
513 {
514 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
515 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
516 int error;
517
518 if (da->nr_blocks) {
519 error = gfs2_quota_lock_check(dip, &ap);
520 if (error)
521 goto fail_quota_locks;
522
523 error = gfs2_inplace_reserve(dip, &ap);
524 if (error)
525 goto fail_quota_locks;
526
527 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
528 if (error)
529 goto fail_ipreserv;
530 } else {
531 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
532 if (error)
533 goto fail_quota_locks;
534 }
535
536 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
537
538 gfs2_trans_end(sdp);
539 fail_ipreserv:
540 gfs2_inplace_release(dip);
541 fail_quota_locks:
542 gfs2_quota_unlock(dip);
543 return error;
544 }
545
546 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
547 void *fs_info)
548 {
549 const struct xattr *xattr;
550 int err = 0;
551
552 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
553 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
554 xattr->value_len, 0,
555 GFS2_EATYPE_SECURITY);
556 if (err < 0)
557 break;
558 }
559 return err;
560 }
561
562 /**
563 * gfs2_create_inode - Create a new inode
564 * @dir: The parent directory
565 * @dentry: The new dentry
566 * @file: If non-NULL, the file which is being opened
567 * @mode: The permissions on the new inode
568 * @dev: For device nodes, this is the device number
569 * @symname: For symlinks, this is the link destination
570 * @size: The initial size of the inode (ignored for directories)
571 *
572 * Returns: 0 on success, or error code
573 */
574
575 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
576 struct file *file,
577 umode_t mode, dev_t dev, const char *symname,
578 unsigned int size, int excl, int *opened)
579 {
580 const struct qstr *name = &dentry->d_name;
581 struct posix_acl *default_acl, *acl;
582 struct gfs2_holder ghs[2];
583 struct inode *inode = NULL;
584 struct gfs2_inode *dip = GFS2_I(dir), *ip;
585 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
586 struct gfs2_glock *io_gl = NULL;
587 int error, free_vfs_inode = 1;
588 u32 aflags = 0;
589 unsigned blocks = 1;
590 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
591
592 if (!name->len || name->len > GFS2_FNAMESIZE)
593 return -ENAMETOOLONG;
594
595 error = gfs2_rsqa_alloc(dip);
596 if (error)
597 return error;
598
599 error = gfs2_rindex_update(sdp);
600 if (error)
601 return error;
602
603 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
604 if (error)
605 goto fail;
606
607 error = create_ok(dip, name, mode);
608 if (error)
609 goto fail_gunlock;
610
611 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
612 error = PTR_ERR(inode);
613 if (!IS_ERR(inode)) {
614 if (S_ISDIR(inode->i_mode)) {
615 iput(inode);
616 inode = ERR_PTR(-EISDIR);
617 goto fail_gunlock;
618 }
619 d_instantiate(dentry, inode);
620 error = 0;
621 if (file) {
622 if (S_ISREG(inode->i_mode))
623 error = finish_open(file, dentry, gfs2_open_common, opened);
624 else
625 error = finish_no_open(file, NULL);
626 }
627 gfs2_glock_dq_uninit(ghs);
628 return error;
629 } else if (error != -ENOENT) {
630 goto fail_gunlock;
631 }
632
633 error = gfs2_diradd_alloc_required(dir, name, &da);
634 if (error < 0)
635 goto fail_gunlock;
636
637 inode = new_inode(sdp->sd_vfs);
638 error = -ENOMEM;
639 if (!inode)
640 goto fail_gunlock;
641
642 error = posix_acl_create(dir, &mode, &default_acl, &acl);
643 if (error)
644 goto fail_gunlock;
645
646 ip = GFS2_I(inode);
647 error = gfs2_rsqa_alloc(ip);
648 if (error)
649 goto fail_free_acls;
650
651 inode->i_mode = mode;
652 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
653 inode->i_rdev = dev;
654 inode->i_size = size;
655 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
656 gfs2_set_inode_blocks(inode, 1);
657 munge_mode_uid_gid(dip, inode);
658 check_and_update_goal(dip);
659 ip->i_goal = dip->i_goal;
660 ip->i_diskflags = 0;
661 ip->i_eattr = 0;
662 ip->i_height = 0;
663 ip->i_depth = 0;
664 ip->i_entries = 0;
665
666 switch(mode & S_IFMT) {
667 case S_IFREG:
668 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
669 gfs2_tune_get(sdp, gt_new_files_jdata))
670 ip->i_diskflags |= GFS2_DIF_JDATA;
671 gfs2_set_aops(inode);
672 break;
673 case S_IFDIR:
674 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
675 ip->i_diskflags |= GFS2_DIF_JDATA;
676 ip->i_entries = 2;
677 break;
678 }
679
680 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
681 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
682 ip->i_diskflags |= GFS2_DIF_SYSTEM;
683
684 gfs2_set_inode_flags(inode);
685
686 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
687 (dip->i_diskflags & GFS2_DIF_TOPDIR))
688 aflags |= GFS2_AF_ORLOV;
689
690 if (default_acl || acl)
691 blocks++;
692
693 error = alloc_dinode(ip, aflags, &blocks);
694 if (error)
695 goto fail_free_inode;
696
697 gfs2_set_inode_blocks(inode, blocks);
698
699 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
700 if (error)
701 goto fail_free_inode;
702
703 ip->i_gl->gl_object = ip;
704 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
705 if (error)
706 goto fail_free_inode;
707
708 error = gfs2_trans_begin(sdp, blocks, 0);
709 if (error)
710 goto fail_gunlock2;
711
712 if (blocks > 1) {
713 ip->i_eattr = ip->i_no_addr + 1;
714 gfs2_init_xattr(ip);
715 }
716 init_dinode(dip, ip, symname);
717 gfs2_trans_end(sdp);
718
719 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
720 if (error)
721 goto fail_gunlock2;
722
723 BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));
724
725 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
726 if (error)
727 goto fail_gunlock2;
728
729 ip->i_iopen_gh.gh_gl->gl_object = ip;
730 gfs2_glock_put(io_gl);
731 gfs2_set_iop(inode);
732 insert_inode_hash(inode);
733
734 free_vfs_inode = 0; /* After this point, the inode is no longer
735 considered free. Any failures need to undo
736 the gfs2 structures. */
737 if (default_acl) {
738 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
739 posix_acl_release(default_acl);
740 }
741 if (acl) {
742 if (!error)
743 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
744 posix_acl_release(acl);
745 }
746
747 if (error)
748 goto fail_gunlock3;
749
750 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
751 &gfs2_initxattrs, NULL);
752 if (error)
753 goto fail_gunlock3;
754
755 error = link_dinode(dip, name, ip, &da);
756 if (error)
757 goto fail_gunlock3;
758
759 mark_inode_dirty(inode);
760 d_instantiate(dentry, inode);
761 if (file) {
762 *opened |= FILE_CREATED;
763 error = finish_open(file, dentry, gfs2_open_common, opened);
764 }
765 gfs2_glock_dq_uninit(ghs);
766 gfs2_glock_dq_uninit(ghs + 1);
767 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
768 return error;
769
770 fail_gunlock3:
771 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
772 gfs2_glock_put(io_gl);
773 fail_gunlock2:
774 if (io_gl)
775 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
776 gfs2_glock_dq_uninit(ghs + 1);
777 fail_free_inode:
778 if (ip->i_gl)
779 gfs2_glock_put(ip->i_gl);
780 gfs2_rsqa_delete(ip, NULL);
781 fail_free_acls:
782 if (default_acl)
783 posix_acl_release(default_acl);
784 if (acl)
785 posix_acl_release(acl);
786 fail_gunlock:
787 gfs2_dir_no_add(&da);
788 gfs2_glock_dq_uninit(ghs);
789 if (inode && !IS_ERR(inode)) {
790 clear_nlink(inode);
791 if (!free_vfs_inode)
792 mark_inode_dirty(inode);
793 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
794 &GFS2_I(inode)->i_flags);
795 iput(inode);
796 }
797 fail:
798 return error;
799 }
800
801 /**
802 * gfs2_create - Create a file
803 * @dir: The directory in which to create the file
804 * @dentry: The dentry of the new file
805 * @mode: The mode of the new file
806 *
807 * Returns: errno
808 */
809
810 static int gfs2_create(struct inode *dir, struct dentry *dentry,
811 umode_t mode, bool excl)
812 {
813 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
814 }
815
816 /**
817 * __gfs2_lookup - Look up a filename in a directory and return its inode
818 * @dir: The directory inode
819 * @dentry: The dentry of the new inode
820 * @file: File to be opened
821 * @opened: atomic_open flags
822 *
823 *
824 * Returns: errno
825 */
826
827 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
828 struct file *file, int *opened)
829 {
830 struct inode *inode;
831 struct dentry *d;
832 struct gfs2_holder gh;
833 struct gfs2_glock *gl;
834 int error;
835
836 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
837 if (inode == NULL) {
838 d_add(dentry, NULL);
839 return NULL;
840 }
841 if (IS_ERR(inode))
842 return ERR_CAST(inode);
843
844 gl = GFS2_I(inode)->i_gl;
845 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
846 if (error) {
847 iput(inode);
848 return ERR_PTR(error);
849 }
850
851 d = d_splice_alias(inode, dentry);
852 if (IS_ERR(d)) {
853 gfs2_glock_dq_uninit(&gh);
854 return d;
855 }
856 if (file && S_ISREG(inode->i_mode))
857 error = finish_open(file, dentry, gfs2_open_common, opened);
858
859 gfs2_glock_dq_uninit(&gh);
860 if (error) {
861 dput(d);
862 return ERR_PTR(error);
863 }
864 return d;
865 }
866
867 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
868 unsigned flags)
869 {
870 return __gfs2_lookup(dir, dentry, NULL, NULL);
871 }
872
873 /**
874 * gfs2_link - Link to a file
875 * @old_dentry: The inode to link
876 * @dir: Add link to this directory
877 * @dentry: The name of the link
878 *
879 * Link the inode in "old_dentry" into the directory "dir" with the
880 * name in "dentry".
881 *
882 * Returns: errno
883 */
884
885 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
886 struct dentry *dentry)
887 {
888 struct gfs2_inode *dip = GFS2_I(dir);
889 struct gfs2_sbd *sdp = GFS2_SB(dir);
890 struct inode *inode = d_inode(old_dentry);
891 struct gfs2_inode *ip = GFS2_I(inode);
892 struct gfs2_holder ghs[2];
893 struct buffer_head *dibh;
894 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
895 int error;
896
897 if (S_ISDIR(inode->i_mode))
898 return -EPERM;
899
900 error = gfs2_rsqa_alloc(dip);
901 if (error)
902 return error;
903
904 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
905 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
906
907 error = gfs2_glock_nq(ghs); /* parent */
908 if (error)
909 goto out_parent;
910
911 error = gfs2_glock_nq(ghs + 1); /* child */
912 if (error)
913 goto out_child;
914
915 error = -ENOENT;
916 if (inode->i_nlink == 0)
917 goto out_gunlock;
918
919 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
920 if (error)
921 goto out_gunlock;
922
923 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
924 switch (error) {
925 case -ENOENT:
926 break;
927 case 0:
928 error = -EEXIST;
929 default:
930 goto out_gunlock;
931 }
932
933 error = -EINVAL;
934 if (!dip->i_inode.i_nlink)
935 goto out_gunlock;
936 error = -EFBIG;
937 if (dip->i_entries == (u32)-1)
938 goto out_gunlock;
939 error = -EPERM;
940 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
941 goto out_gunlock;
942 error = -EINVAL;
943 if (!ip->i_inode.i_nlink)
944 goto out_gunlock;
945 error = -EMLINK;
946 if (ip->i_inode.i_nlink == (u32)-1)
947 goto out_gunlock;
948
949 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
950 if (error < 0)
951 goto out_gunlock;
952
953 if (da.nr_blocks) {
954 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
955 error = gfs2_quota_lock_check(dip, &ap);
956 if (error)
957 goto out_gunlock;
958
959 error = gfs2_inplace_reserve(dip, &ap);
960 if (error)
961 goto out_gunlock_q;
962
963 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
964 if (error)
965 goto out_ipres;
966 } else {
967 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
968 if (error)
969 goto out_ipres;
970 }
971
972 error = gfs2_meta_inode_buffer(ip, &dibh);
973 if (error)
974 goto out_end_trans;
975
976 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
977 if (error)
978 goto out_brelse;
979
980 gfs2_trans_add_meta(ip->i_gl, dibh);
981 inc_nlink(&ip->i_inode);
982 ip->i_inode.i_ctime = CURRENT_TIME;
983 ihold(inode);
984 d_instantiate(dentry, inode);
985 mark_inode_dirty(inode);
986
987 out_brelse:
988 brelse(dibh);
989 out_end_trans:
990 gfs2_trans_end(sdp);
991 out_ipres:
992 if (da.nr_blocks)
993 gfs2_inplace_release(dip);
994 out_gunlock_q:
995 if (da.nr_blocks)
996 gfs2_quota_unlock(dip);
997 out_gunlock:
998 gfs2_dir_no_add(&da);
999 gfs2_glock_dq(ghs + 1);
1000 out_child:
1001 gfs2_glock_dq(ghs);
1002 out_parent:
1003 gfs2_holder_uninit(ghs);
1004 gfs2_holder_uninit(ghs + 1);
1005 return error;
1006 }
1007
1008 /*
1009 * gfs2_unlink_ok - check to see that a inode is still in a directory
1010 * @dip: the directory
1011 * @name: the name of the file
1012 * @ip: the inode
1013 *
1014 * Assumes that the lock on (at least) @dip is held.
1015 *
1016 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1017 */
1018
1019 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1020 const struct gfs2_inode *ip)
1021 {
1022 int error;
1023
1024 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1025 return -EPERM;
1026
1027 if ((dip->i_inode.i_mode & S_ISVTX) &&
1028 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1029 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1030 return -EPERM;
1031
1032 if (IS_APPEND(&dip->i_inode))
1033 return -EPERM;
1034
1035 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1036 if (error)
1037 return error;
1038
1039 return gfs2_dir_check(&dip->i_inode, name, ip);
1040 }
1041
1042 /**
1043 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1044 * @dip: The parent directory
1045 * @name: The name of the entry in the parent directory
1046 * @inode: The inode to be removed
1047 *
1048 * Called with all the locks and in a transaction. This will only be
1049 * called for a directory after it has been checked to ensure it is empty.
1050 *
1051 * Returns: 0 on success, or an error
1052 */
1053
1054 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1055 const struct dentry *dentry)
1056 {
1057 struct inode *inode = d_inode(dentry);
1058 struct gfs2_inode *ip = GFS2_I(inode);
1059 int error;
1060
1061 error = gfs2_dir_del(dip, dentry);
1062 if (error)
1063 return error;
1064
1065 ip->i_entries = 0;
1066 inode->i_ctime = CURRENT_TIME;
1067 if (S_ISDIR(inode->i_mode))
1068 clear_nlink(inode);
1069 else
1070 drop_nlink(inode);
1071 mark_inode_dirty(inode);
1072 if (inode->i_nlink == 0)
1073 gfs2_unlink_di(inode);
1074 return 0;
1075 }
1076
1077
1078 /**
1079 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1080 * @dir: The inode of the directory containing the inode to unlink
1081 * @dentry: The file itself
1082 *
1083 * This routine uses the type of the inode as a flag to figure out
1084 * whether this is an unlink or an rmdir.
1085 *
1086 * Returns: errno
1087 */
1088
1089 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1090 {
1091 struct gfs2_inode *dip = GFS2_I(dir);
1092 struct gfs2_sbd *sdp = GFS2_SB(dir);
1093 struct inode *inode = d_inode(dentry);
1094 struct gfs2_inode *ip = GFS2_I(inode);
1095 struct gfs2_holder ghs[3];
1096 struct gfs2_rgrpd *rgd;
1097 int error;
1098
1099 error = gfs2_rindex_update(sdp);
1100 if (error)
1101 return error;
1102
1103 error = -EROFS;
1104
1105 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1106 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1107
1108 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1109 if (!rgd)
1110 goto out_inodes;
1111
1112 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1113
1114
1115 error = gfs2_glock_nq(ghs); /* parent */
1116 if (error)
1117 goto out_parent;
1118
1119 error = gfs2_glock_nq(ghs + 1); /* child */
1120 if (error)
1121 goto out_child;
1122
1123 error = -ENOENT;
1124 if (inode->i_nlink == 0)
1125 goto out_rgrp;
1126
1127 if (S_ISDIR(inode->i_mode)) {
1128 error = -ENOTEMPTY;
1129 if (ip->i_entries > 2 || inode->i_nlink > 2)
1130 goto out_rgrp;
1131 }
1132
1133 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1134 if (error)
1135 goto out_rgrp;
1136
1137 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1138 if (error)
1139 goto out_gunlock;
1140
1141 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1142 if (error)
1143 goto out_end_trans;
1144
1145 error = gfs2_unlink_inode(dip, dentry);
1146
1147 out_end_trans:
1148 gfs2_trans_end(sdp);
1149 out_gunlock:
1150 gfs2_glock_dq(ghs + 2);
1151 out_rgrp:
1152 gfs2_glock_dq(ghs + 1);
1153 out_child:
1154 gfs2_glock_dq(ghs);
1155 out_parent:
1156 gfs2_holder_uninit(ghs + 2);
1157 out_inodes:
1158 gfs2_holder_uninit(ghs + 1);
1159 gfs2_holder_uninit(ghs);
1160 return error;
1161 }
1162
1163 /**
1164 * gfs2_symlink - Create a symlink
1165 * @dir: The directory to create the symlink in
1166 * @dentry: The dentry to put the symlink in
1167 * @symname: The thing which the link points to
1168 *
1169 * Returns: errno
1170 */
1171
1172 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1173 const char *symname)
1174 {
1175 struct gfs2_sbd *sdp = GFS2_SB(dir);
1176 unsigned int size;
1177
1178 size = strlen(symname);
1179 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1180 return -ENAMETOOLONG;
1181
1182 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1183 }
1184
1185 /**
1186 * gfs2_mkdir - Make a directory
1187 * @dir: The parent directory of the new one
1188 * @dentry: The dentry of the new directory
1189 * @mode: The mode of the new directory
1190 *
1191 * Returns: errno
1192 */
1193
1194 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1195 {
1196 struct gfs2_sbd *sdp = GFS2_SB(dir);
1197 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1198 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1199 }
1200
1201 /**
1202 * gfs2_mknod - Make a special file
1203 * @dir: The directory in which the special file will reside
1204 * @dentry: The dentry of the special file
1205 * @mode: The mode of the special file
1206 * @dev: The device specification of the special file
1207 *
1208 */
1209
1210 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1211 dev_t dev)
1212 {
1213 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1214 }
1215
1216 /**
1217 * gfs2_atomic_open - Atomically open a file
1218 * @dir: The directory
1219 * @dentry: The proposed new entry
1220 * @file: The proposed new struct file
1221 * @flags: open flags
1222 * @mode: File mode
1223 * @opened: Flag to say whether the file has been opened or not
1224 *
1225 * Returns: error code or 0 for success
1226 */
1227
1228 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1229 struct file *file, unsigned flags,
1230 umode_t mode, int *opened)
1231 {
1232 struct dentry *d;
1233 bool excl = !!(flags & O_EXCL);
1234
1235 if (!d_in_lookup(dentry))
1236 goto skip_lookup;
1237
1238 d = __gfs2_lookup(dir, dentry, file, opened);
1239 if (IS_ERR(d))
1240 return PTR_ERR(d);
1241 if (d != NULL)
1242 dentry = d;
1243 if (d_really_is_positive(dentry)) {
1244 if (!(*opened & FILE_OPENED))
1245 return finish_no_open(file, d);
1246 dput(d);
1247 return 0;
1248 }
1249
1250 BUG_ON(d != NULL);
1251
1252 skip_lookup:
1253 if (!(flags & O_CREAT))
1254 return -ENOENT;
1255
1256 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1257 }
1258
1259 /*
1260 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1261 * @this: move this
1262 * @to: to here
1263 *
1264 * Follow @to back to the root and make sure we don't encounter @this
1265 * Assumes we already hold the rename lock.
1266 *
1267 * Returns: errno
1268 */
1269
1270 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1271 {
1272 struct inode *dir = &to->i_inode;
1273 struct super_block *sb = dir->i_sb;
1274 struct inode *tmp;
1275 int error = 0;
1276
1277 igrab(dir);
1278
1279 for (;;) {
1280 if (dir == &this->i_inode) {
1281 error = -EINVAL;
1282 break;
1283 }
1284 if (dir == d_inode(sb->s_root)) {
1285 error = 0;
1286 break;
1287 }
1288
1289 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1290 if (!tmp) {
1291 error = -ENOENT;
1292 break;
1293 }
1294 if (IS_ERR(tmp)) {
1295 error = PTR_ERR(tmp);
1296 break;
1297 }
1298
1299 iput(dir);
1300 dir = tmp;
1301 }
1302
1303 iput(dir);
1304
1305 return error;
1306 }
1307
1308 /**
1309 * update_moved_ino - Update an inode that's being moved
1310 * @ip: The inode being moved
1311 * @ndip: The parent directory of the new filename
1312 * @dir_rename: True of ip is a directory
1313 *
1314 * Returns: errno
1315 */
1316
1317 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1318 int dir_rename)
1319 {
1320 int error;
1321 struct buffer_head *dibh;
1322
1323 if (dir_rename)
1324 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1325
1326 error = gfs2_meta_inode_buffer(ip, &dibh);
1327 if (error)
1328 return error;
1329 ip->i_inode.i_ctime = CURRENT_TIME;
1330 gfs2_trans_add_meta(ip->i_gl, dibh);
1331 gfs2_dinode_out(ip, dibh->b_data);
1332 brelse(dibh);
1333 return 0;
1334 }
1335
1336
1337 /**
1338 * gfs2_rename - Rename a file
1339 * @odir: Parent directory of old file name
1340 * @odentry: The old dentry of the file
1341 * @ndir: Parent directory of new file name
1342 * @ndentry: The new dentry of the file
1343 *
1344 * Returns: errno
1345 */
1346
1347 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1348 struct inode *ndir, struct dentry *ndentry)
1349 {
1350 struct gfs2_inode *odip = GFS2_I(odir);
1351 struct gfs2_inode *ndip = GFS2_I(ndir);
1352 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1353 struct gfs2_inode *nip = NULL;
1354 struct gfs2_sbd *sdp = GFS2_SB(odir);
1355 struct gfs2_holder ghs[5], r_gh;
1356 struct gfs2_rgrpd *nrgd;
1357 unsigned int num_gh;
1358 int dir_rename = 0;
1359 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1360 unsigned int x;
1361 int error;
1362
1363 gfs2_holder_mark_uninitialized(&r_gh);
1364 if (d_really_is_positive(ndentry)) {
1365 nip = GFS2_I(d_inode(ndentry));
1366 if (ip == nip)
1367 return 0;
1368 }
1369
1370 error = gfs2_rindex_update(sdp);
1371 if (error)
1372 return error;
1373
1374 error = gfs2_rsqa_alloc(ndip);
1375 if (error)
1376 return error;
1377
1378 if (odip != ndip) {
1379 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1380 0, &r_gh);
1381 if (error)
1382 goto out;
1383
1384 if (S_ISDIR(ip->i_inode.i_mode)) {
1385 dir_rename = 1;
1386 /* don't move a directory into its subdir */
1387 error = gfs2_ok_to_move(ip, ndip);
1388 if (error)
1389 goto out_gunlock_r;
1390 }
1391 }
1392
1393 num_gh = 1;
1394 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1395 if (odip != ndip) {
1396 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1397 num_gh++;
1398 }
1399 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1400 num_gh++;
1401
1402 if (nip) {
1403 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1404 num_gh++;
1405 /* grab the resource lock for unlink flag twiddling
1406 * this is the case of the target file already existing
1407 * so we unlink before doing the rename
1408 */
1409 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1410 if (nrgd)
1411 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1412 }
1413
1414 for (x = 0; x < num_gh; x++) {
1415 error = gfs2_glock_nq(ghs + x);
1416 if (error)
1417 goto out_gunlock;
1418 }
1419
1420 error = -ENOENT;
1421 if (ip->i_inode.i_nlink == 0)
1422 goto out_gunlock;
1423
1424 /* Check out the old directory */
1425
1426 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1427 if (error)
1428 goto out_gunlock;
1429
1430 /* Check out the new directory */
1431
1432 if (nip) {
1433 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1434 if (error)
1435 goto out_gunlock;
1436
1437 if (nip->i_inode.i_nlink == 0) {
1438 error = -EAGAIN;
1439 goto out_gunlock;
1440 }
1441
1442 if (S_ISDIR(nip->i_inode.i_mode)) {
1443 if (nip->i_entries < 2) {
1444 gfs2_consist_inode(nip);
1445 error = -EIO;
1446 goto out_gunlock;
1447 }
1448 if (nip->i_entries > 2) {
1449 error = -ENOTEMPTY;
1450 goto out_gunlock;
1451 }
1452 }
1453 } else {
1454 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1455 if (error)
1456 goto out_gunlock;
1457
1458 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1459 switch (error) {
1460 case -ENOENT:
1461 error = 0;
1462 break;
1463 case 0:
1464 error = -EEXIST;
1465 default:
1466 goto out_gunlock;
1467 };
1468
1469 if (odip != ndip) {
1470 if (!ndip->i_inode.i_nlink) {
1471 error = -ENOENT;
1472 goto out_gunlock;
1473 }
1474 if (ndip->i_entries == (u32)-1) {
1475 error = -EFBIG;
1476 goto out_gunlock;
1477 }
1478 if (S_ISDIR(ip->i_inode.i_mode) &&
1479 ndip->i_inode.i_nlink == (u32)-1) {
1480 error = -EMLINK;
1481 goto out_gunlock;
1482 }
1483 }
1484 }
1485
1486 /* Check out the dir to be renamed */
1487
1488 if (dir_rename) {
1489 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1490 if (error)
1491 goto out_gunlock;
1492 }
1493
1494 if (nip == NULL) {
1495 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1496 if (error)
1497 goto out_gunlock;
1498 }
1499
1500 if (da.nr_blocks) {
1501 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1502 error = gfs2_quota_lock_check(ndip, &ap);
1503 if (error)
1504 goto out_gunlock;
1505
1506 error = gfs2_inplace_reserve(ndip, &ap);
1507 if (error)
1508 goto out_gunlock_q;
1509
1510 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1511 4 * RES_LEAF + 4, 0);
1512 if (error)
1513 goto out_ipreserv;
1514 } else {
1515 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1516 5 * RES_LEAF + 4, 0);
1517 if (error)
1518 goto out_gunlock;
1519 }
1520
1521 /* Remove the target file, if it exists */
1522
1523 if (nip)
1524 error = gfs2_unlink_inode(ndip, ndentry);
1525
1526 error = update_moved_ino(ip, ndip, dir_rename);
1527 if (error)
1528 goto out_end_trans;
1529
1530 error = gfs2_dir_del(odip, odentry);
1531 if (error)
1532 goto out_end_trans;
1533
1534 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1535 if (error)
1536 goto out_end_trans;
1537
1538 out_end_trans:
1539 gfs2_trans_end(sdp);
1540 out_ipreserv:
1541 if (da.nr_blocks)
1542 gfs2_inplace_release(ndip);
1543 out_gunlock_q:
1544 if (da.nr_blocks)
1545 gfs2_quota_unlock(ndip);
1546 out_gunlock:
1547 gfs2_dir_no_add(&da);
1548 while (x--) {
1549 gfs2_glock_dq(ghs + x);
1550 gfs2_holder_uninit(ghs + x);
1551 }
1552 out_gunlock_r:
1553 if (gfs2_holder_initialized(&r_gh))
1554 gfs2_glock_dq_uninit(&r_gh);
1555 out:
1556 return error;
1557 }
1558
1559 /**
1560 * gfs2_exchange - exchange two files
1561 * @odir: Parent directory of old file name
1562 * @odentry: The old dentry of the file
1563 * @ndir: Parent directory of new file name
1564 * @ndentry: The new dentry of the file
1565 * @flags: The rename flags
1566 *
1567 * Returns: errno
1568 */
1569
1570 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1571 struct inode *ndir, struct dentry *ndentry,
1572 unsigned int flags)
1573 {
1574 struct gfs2_inode *odip = GFS2_I(odir);
1575 struct gfs2_inode *ndip = GFS2_I(ndir);
1576 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1577 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1578 struct gfs2_sbd *sdp = GFS2_SB(odir);
1579 struct gfs2_holder ghs[5], r_gh;
1580 unsigned int num_gh;
1581 unsigned int x;
1582 umode_t old_mode = oip->i_inode.i_mode;
1583 umode_t new_mode = nip->i_inode.i_mode;
1584 int error;
1585
1586 gfs2_holder_mark_uninitialized(&r_gh);
1587 error = gfs2_rindex_update(sdp);
1588 if (error)
1589 return error;
1590
1591 if (odip != ndip) {
1592 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1593 0, &r_gh);
1594 if (error)
1595 goto out;
1596
1597 if (S_ISDIR(old_mode)) {
1598 /* don't move a directory into its subdir */
1599 error = gfs2_ok_to_move(oip, ndip);
1600 if (error)
1601 goto out_gunlock_r;
1602 }
1603
1604 if (S_ISDIR(new_mode)) {
1605 /* don't move a directory into its subdir */
1606 error = gfs2_ok_to_move(nip, odip);
1607 if (error)
1608 goto out_gunlock_r;
1609 }
1610 }
1611
1612 num_gh = 1;
1613 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1614 if (odip != ndip) {
1615 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1616 num_gh++;
1617 }
1618 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1619 num_gh++;
1620
1621 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1622 num_gh++;
1623
1624 for (x = 0; x < num_gh; x++) {
1625 error = gfs2_glock_nq(ghs + x);
1626 if (error)
1627 goto out_gunlock;
1628 }
1629
1630 error = -ENOENT;
1631 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1632 goto out_gunlock;
1633
1634 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1635 if (error)
1636 goto out_gunlock;
1637 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1638 if (error)
1639 goto out_gunlock;
1640
1641 if (S_ISDIR(old_mode)) {
1642 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1643 if (error)
1644 goto out_gunlock;
1645 }
1646 if (S_ISDIR(new_mode)) {
1647 error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1648 if (error)
1649 goto out_gunlock;
1650 }
1651 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1652 if (error)
1653 goto out_gunlock;
1654
1655 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1656 if (error)
1657 goto out_end_trans;
1658
1659 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1660 if (error)
1661 goto out_end_trans;
1662
1663 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1664 IF2DT(old_mode));
1665 if (error)
1666 goto out_end_trans;
1667
1668 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1669 IF2DT(new_mode));
1670 if (error)
1671 goto out_end_trans;
1672
1673 if (odip != ndip) {
1674 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1675 inc_nlink(&odip->i_inode);
1676 drop_nlink(&ndip->i_inode);
1677 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1678 inc_nlink(&ndip->i_inode);
1679 drop_nlink(&odip->i_inode);
1680 }
1681 }
1682 mark_inode_dirty(&ndip->i_inode);
1683 if (odip != ndip)
1684 mark_inode_dirty(&odip->i_inode);
1685
1686 out_end_trans:
1687 gfs2_trans_end(sdp);
1688 out_gunlock:
1689 while (x--) {
1690 gfs2_glock_dq(ghs + x);
1691 gfs2_holder_uninit(ghs + x);
1692 }
1693 out_gunlock_r:
1694 if (gfs2_holder_initialized(&r_gh))
1695 gfs2_glock_dq_uninit(&r_gh);
1696 out:
1697 return error;
1698 }
1699
1700 static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1701 struct inode *ndir, struct dentry *ndentry,
1702 unsigned int flags)
1703 {
1704 flags &= ~RENAME_NOREPLACE;
1705
1706 if (flags & ~RENAME_EXCHANGE)
1707 return -EINVAL;
1708
1709 if (flags & RENAME_EXCHANGE)
1710 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1711
1712 return gfs2_rename(odir, odentry, ndir, ndentry);
1713 }
1714
1715 /**
1716 * gfs2_get_link - Follow a symbolic link
1717 * @dentry: The dentry of the link
1718 * @inode: The inode of the link
1719 * @done: destructor for return value
1720 *
1721 * This can handle symlinks of any size.
1722 *
1723 * Returns: 0 on success or error code
1724 */
1725
1726 static const char *gfs2_get_link(struct dentry *dentry,
1727 struct inode *inode,
1728 struct delayed_call *done)
1729 {
1730 struct gfs2_inode *ip = GFS2_I(inode);
1731 struct gfs2_holder i_gh;
1732 struct buffer_head *dibh;
1733 unsigned int size;
1734 char *buf;
1735 int error;
1736
1737 if (!dentry)
1738 return ERR_PTR(-ECHILD);
1739
1740 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1741 error = gfs2_glock_nq(&i_gh);
1742 if (error) {
1743 gfs2_holder_uninit(&i_gh);
1744 return ERR_PTR(error);
1745 }
1746
1747 size = (unsigned int)i_size_read(&ip->i_inode);
1748 if (size == 0) {
1749 gfs2_consist_inode(ip);
1750 buf = ERR_PTR(-EIO);
1751 goto out;
1752 }
1753
1754 error = gfs2_meta_inode_buffer(ip, &dibh);
1755 if (error) {
1756 buf = ERR_PTR(error);
1757 goto out;
1758 }
1759
1760 buf = kzalloc(size + 1, GFP_NOFS);
1761 if (!buf)
1762 buf = ERR_PTR(-ENOMEM);
1763 else
1764 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1765 brelse(dibh);
1766 out:
1767 gfs2_glock_dq_uninit(&i_gh);
1768 if (!IS_ERR(buf))
1769 set_delayed_call(done, kfree_link, buf);
1770 return buf;
1771 }
1772
1773 /**
1774 * gfs2_permission -
1775 * @inode: The inode
1776 * @mask: The mask to be tested
1777 * @flags: Indicates whether this is an RCU path walk or not
1778 *
1779 * This may be called from the VFS directly, or from within GFS2 with the
1780 * inode locked, so we look to see if the glock is already locked and only
1781 * lock the glock if its not already been done.
1782 *
1783 * Returns: errno
1784 */
1785
1786 int gfs2_permission(struct inode *inode, int mask)
1787 {
1788 struct gfs2_inode *ip;
1789 struct gfs2_holder i_gh;
1790 int error;
1791
1792 gfs2_holder_mark_uninitialized(&i_gh);
1793 ip = GFS2_I(inode);
1794 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1795 if (mask & MAY_NOT_BLOCK)
1796 return -ECHILD;
1797 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1798 if (error)
1799 return error;
1800 }
1801
1802 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1803 error = -EPERM;
1804 else
1805 error = generic_permission(inode, mask);
1806 if (gfs2_holder_initialized(&i_gh))
1807 gfs2_glock_dq_uninit(&i_gh);
1808
1809 return error;
1810 }
1811
1812 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1813 {
1814 setattr_copy(inode, attr);
1815 mark_inode_dirty(inode);
1816 return 0;
1817 }
1818
1819 /**
1820 * gfs2_setattr_simple -
1821 * @ip:
1822 * @attr:
1823 *
1824 * Returns: errno
1825 */
1826
1827 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1828 {
1829 int error;
1830
1831 if (current->journal_info)
1832 return __gfs2_setattr_simple(inode, attr);
1833
1834 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1835 if (error)
1836 return error;
1837
1838 error = __gfs2_setattr_simple(inode, attr);
1839 gfs2_trans_end(GFS2_SB(inode));
1840 return error;
1841 }
1842
1843 static int setattr_chown(struct inode *inode, struct iattr *attr)
1844 {
1845 struct gfs2_inode *ip = GFS2_I(inode);
1846 struct gfs2_sbd *sdp = GFS2_SB(inode);
1847 kuid_t ouid, nuid;
1848 kgid_t ogid, ngid;
1849 int error;
1850 struct gfs2_alloc_parms ap;
1851
1852 ouid = inode->i_uid;
1853 ogid = inode->i_gid;
1854 nuid = attr->ia_uid;
1855 ngid = attr->ia_gid;
1856
1857 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1858 ouid = nuid = NO_UID_QUOTA_CHANGE;
1859 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1860 ogid = ngid = NO_GID_QUOTA_CHANGE;
1861
1862 error = gfs2_rsqa_alloc(ip);
1863 if (error)
1864 goto out;
1865
1866 error = gfs2_rindex_update(sdp);
1867 if (error)
1868 goto out;
1869
1870 error = gfs2_quota_lock(ip, nuid, ngid);
1871 if (error)
1872 goto out;
1873
1874 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1875
1876 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1877 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1878 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1879 if (error)
1880 goto out_gunlock_q;
1881 }
1882
1883 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1884 if (error)
1885 goto out_gunlock_q;
1886
1887 error = gfs2_setattr_simple(inode, attr);
1888 if (error)
1889 goto out_end_trans;
1890
1891 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1892 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1893 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1894 gfs2_quota_change(ip, ap.target, nuid, ngid);
1895 }
1896
1897 out_end_trans:
1898 gfs2_trans_end(sdp);
1899 out_gunlock_q:
1900 gfs2_quota_unlock(ip);
1901 out:
1902 return error;
1903 }
1904
1905 /**
1906 * gfs2_setattr - Change attributes on an inode
1907 * @dentry: The dentry which is changing
1908 * @attr: The structure describing the change
1909 *
1910 * The VFS layer wants to change one or more of an inodes attributes. Write
1911 * that change out to disk.
1912 *
1913 * Returns: errno
1914 */
1915
1916 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1917 {
1918 struct inode *inode = d_inode(dentry);
1919 struct gfs2_inode *ip = GFS2_I(inode);
1920 struct gfs2_holder i_gh;
1921 int error;
1922
1923 error = gfs2_rsqa_alloc(ip);
1924 if (error)
1925 return error;
1926
1927 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1928 if (error)
1929 return error;
1930
1931 error = -EPERM;
1932 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1933 goto out;
1934
1935 error = inode_change_ok(inode, attr);
1936 if (error)
1937 goto out;
1938
1939 if (attr->ia_valid & ATTR_SIZE)
1940 error = gfs2_setattr_size(inode, attr->ia_size);
1941 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1942 error = setattr_chown(inode, attr);
1943 else {
1944 error = gfs2_setattr_simple(inode, attr);
1945 if (!error && attr->ia_valid & ATTR_MODE)
1946 error = posix_acl_chmod(inode, inode->i_mode);
1947 }
1948
1949 out:
1950 if (!error)
1951 mark_inode_dirty(inode);
1952 gfs2_glock_dq_uninit(&i_gh);
1953 return error;
1954 }
1955
1956 /**
1957 * gfs2_getattr - Read out an inode's attributes
1958 * @mnt: The vfsmount the inode is being accessed from
1959 * @dentry: The dentry to stat
1960 * @stat: The inode's stats
1961 *
1962 * This may be called from the VFS directly, or from within GFS2 with the
1963 * inode locked, so we look to see if the glock is already locked and only
1964 * lock the glock if its not already been done. Note that its the NFS
1965 * readdirplus operation which causes this to be called (from filldir)
1966 * with the glock already held.
1967 *
1968 * Returns: errno
1969 */
1970
1971 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1972 struct kstat *stat)
1973 {
1974 struct inode *inode = d_inode(dentry);
1975 struct gfs2_inode *ip = GFS2_I(inode);
1976 struct gfs2_holder gh;
1977 int error;
1978
1979 gfs2_holder_mark_uninitialized(&gh);
1980 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1981 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1982 if (error)
1983 return error;
1984 }
1985
1986 generic_fillattr(inode, stat);
1987 if (gfs2_holder_initialized(&gh))
1988 gfs2_glock_dq_uninit(&gh);
1989
1990 return 0;
1991 }
1992
1993 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1994 u64 start, u64 len)
1995 {
1996 struct gfs2_inode *ip = GFS2_I(inode);
1997 struct gfs2_holder gh;
1998 int ret;
1999
2000 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
2001 if (ret)
2002 return ret;
2003
2004 inode_lock(inode);
2005
2006 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2007 if (ret)
2008 goto out;
2009
2010 if (gfs2_is_stuffed(ip)) {
2011 u64 phys = ip->i_no_addr << inode->i_blkbits;
2012 u64 size = i_size_read(inode);
2013 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
2014 FIEMAP_EXTENT_DATA_INLINE;
2015 phys += sizeof(struct gfs2_dinode);
2016 phys += start;
2017 if (start + len > size)
2018 len = size - start;
2019 if (start < size)
2020 ret = fiemap_fill_next_extent(fieinfo, start, phys,
2021 len, flags);
2022 if (ret == 1)
2023 ret = 0;
2024 } else {
2025 ret = __generic_block_fiemap(inode, fieinfo, start, len,
2026 gfs2_block_map);
2027 }
2028
2029 gfs2_glock_dq_uninit(&gh);
2030 out:
2031 inode_unlock(inode);
2032 return ret;
2033 }
2034
2035 const struct inode_operations gfs2_file_iops = {
2036 .permission = gfs2_permission,
2037 .setattr = gfs2_setattr,
2038 .getattr = gfs2_getattr,
2039 .setxattr = generic_setxattr,
2040 .getxattr = generic_getxattr,
2041 .listxattr = gfs2_listxattr,
2042 .removexattr = generic_removexattr,
2043 .fiemap = gfs2_fiemap,
2044 .get_acl = gfs2_get_acl,
2045 .set_acl = gfs2_set_acl,
2046 };
2047
2048 const struct inode_operations gfs2_dir_iops = {
2049 .create = gfs2_create,
2050 .lookup = gfs2_lookup,
2051 .link = gfs2_link,
2052 .unlink = gfs2_unlink,
2053 .symlink = gfs2_symlink,
2054 .mkdir = gfs2_mkdir,
2055 .rmdir = gfs2_unlink,
2056 .mknod = gfs2_mknod,
2057 .rename = gfs2_rename2,
2058 .permission = gfs2_permission,
2059 .setattr = gfs2_setattr,
2060 .getattr = gfs2_getattr,
2061 .setxattr = generic_setxattr,
2062 .getxattr = generic_getxattr,
2063 .listxattr = gfs2_listxattr,
2064 .removexattr = generic_removexattr,
2065 .fiemap = gfs2_fiemap,
2066 .get_acl = gfs2_get_acl,
2067 .set_acl = gfs2_set_acl,
2068 .atomic_open = gfs2_atomic_open,
2069 };
2070
2071 const struct inode_operations gfs2_symlink_iops = {
2072 .readlink = generic_readlink,
2073 .get_link = gfs2_get_link,
2074 .permission = gfs2_permission,
2075 .setattr = gfs2_setattr,
2076 .getattr = gfs2_getattr,
2077 .setxattr = generic_setxattr,
2078 .getxattr = generic_getxattr,
2079 .listxattr = gfs2_listxattr,
2080 .removexattr = generic_removexattr,
2081 .fiemap = gfs2_fiemap,
2082 };
2083
Linux kernel - Deliverables
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