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mm/hmm.c: remove superfluous RCU protection around radix tree lookup
[linux/fpc-iii.git] / fs / gfs2 / inode.c
blob8700eb81563829dd69929d5ad292e9ae1cbc7816
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/cred.h>
17 #include <linux/xattr.h>
18 #include <linux/posix_acl.h>
19 #include <linux/gfs2_ondisk.h>
20 #include <linux/crc32.h>
21 #include <linux/iomap.h>
22 #include <linux/security.h>
23 #include <linux/uaccess.h>
24
25 #include "gfs2.h"
26 #include "incore.h"
27 #include "acl.h"
28 #include "bmap.h"
29 #include "dir.h"
30 #include "xattr.h"
31 #include "glock.h"
32 #include "inode.h"
33 #include "meta_io.h"
34 #include "quota.h"
35 #include "rgrp.h"
36 #include "trans.h"
37 #include "util.h"
38 #include "super.h"
39 #include "glops.h"
40
41 static int iget_test(struct inode *inode, void *opaque)
42 {
43 u64 no_addr = *(u64 *)opaque;
44
45 return GFS2_I(inode)->i_no_addr == no_addr;
46 }
47
48 static int iget_set(struct inode *inode, void *opaque)
49 {
50 u64 no_addr = *(u64 *)opaque;
51
52 GFS2_I(inode)->i_no_addr = no_addr;
53 inode->i_ino = no_addr;
54 return 0;
55 }
56
57 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
58 {
59 struct inode *inode;
60
61 repeat:
62 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
63 if (!inode)
64 return inode;
65 if (is_bad_inode(inode)) {
66 iput(inode);
67 goto repeat;
68 }
69 return inode;
70 }
71
72 /**
73 * gfs2_set_iop - Sets inode operations
74 * @inode: The inode with correct i_mode filled in
75 *
76 * GFS2 lookup code fills in vfs inode contents based on info obtained
77 * from directory entry inside gfs2_inode_lookup().
78 */
79
80 static void gfs2_set_iop(struct inode *inode)
81 {
82 struct gfs2_sbd *sdp = GFS2_SB(inode);
83 umode_t mode = inode->i_mode;
84
85 if (S_ISREG(mode)) {
86 inode->i_op = &gfs2_file_iops;
87 if (gfs2_localflocks(sdp))
88 inode->i_fop = &gfs2_file_fops_nolock;
89 else
90 inode->i_fop = &gfs2_file_fops;
91 } else if (S_ISDIR(mode)) {
92 inode->i_op = &gfs2_dir_iops;
93 if (gfs2_localflocks(sdp))
94 inode->i_fop = &gfs2_dir_fops_nolock;
95 else
96 inode->i_fop = &gfs2_dir_fops;
97 } else if (S_ISLNK(mode)) {
98 inode->i_op = &gfs2_symlink_iops;
99 } else {
100 inode->i_op = &gfs2_file_iops;
101 init_special_inode(inode, inode->i_mode, inode->i_rdev);
102 }
103 }
104
105 /**
106 * gfs2_inode_lookup - Lookup an inode
107 * @sb: The super block
108 * @type: The type of the inode
109 * @no_addr: The inode number
110 * @no_formal_ino: The inode generation number
111 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
112 * GFS2_BLKST_FREE to indicate not to verify)
113 *
114 * If @type is DT_UNKNOWN, the inode type is fetched from disk.
115 *
116 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
117 * placeholder because it doesn't otherwise make sense), the on-disk block type
118 * is verified to be @blktype.
119 *
120 * Returns: A VFS inode, or an error
121 */
122
123 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
124 u64 no_addr, u64 no_formal_ino,
125 unsigned int blktype)
126 {
127 struct inode *inode;
128 struct gfs2_inode *ip;
129 struct gfs2_glock *io_gl = NULL;
130 struct gfs2_holder i_gh;
131 int error;
132
133 gfs2_holder_mark_uninitialized(&i_gh);
134 inode = gfs2_iget(sb, no_addr);
135 if (!inode)
136 return ERR_PTR(-ENOMEM);
137
138 ip = GFS2_I(inode);
139
140 if (inode->i_state & I_NEW) {
141 struct gfs2_sbd *sdp = GFS2_SB(inode);
142 ip->i_no_formal_ino = no_formal_ino;
143
144 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
145 if (unlikely(error))
146 goto fail;
147 flush_delayed_work(&ip->i_gl->gl_work);
148
149 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
150 if (unlikely(error))
151 goto fail_put;
152
153 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
154 /*
155 * The GL_SKIP flag indicates to skip reading the inode
156 * block. We read the inode with gfs2_inode_refresh
157 * after possibly checking the block type.
158 */
159 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
160 GL_SKIP, &i_gh);
161 if (error)
162 goto fail_put;
163
164 if (blktype != GFS2_BLKST_FREE) {
165 error = gfs2_check_blk_type(sdp, no_addr,
166 blktype);
167 if (error)
168 goto fail_put;
169 }
170 }
171
172 glock_set_object(ip->i_gl, ip);
173 set_bit(GIF_INVALID, &ip->i_flags);
174 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
175 if (unlikely(error))
176 goto fail_put;
177 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
178 gfs2_glock_put(io_gl);
179 io_gl = NULL;
180
181 if (type == DT_UNKNOWN) {
182 /* Inode glock must be locked already */
183 error = gfs2_inode_refresh(GFS2_I(inode));
184 if (error)
185 goto fail_refresh;
186 } else {
187 inode->i_mode = DT2IF(type);
188 }
189
190 gfs2_set_iop(inode);
191
192 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
193 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
194 inode->i_atime.tv_nsec = 0;
195
196 unlock_new_inode(inode);
197 }
198
199 if (gfs2_holder_initialized(&i_gh))
200 gfs2_glock_dq_uninit(&i_gh);
201 return inode;
202
203 fail_refresh:
204 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
205 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
206 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
207 fail_put:
208 if (io_gl)
209 gfs2_glock_put(io_gl);
210 glock_clear_object(ip->i_gl, ip);
211 if (gfs2_holder_initialized(&i_gh))
212 gfs2_glock_dq_uninit(&i_gh);
213 fail:
214 iget_failed(inode);
215 return ERR_PTR(error);
216 }
217
218 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
219 u64 *no_formal_ino, unsigned int blktype)
220 {
221 struct super_block *sb = sdp->sd_vfs;
222 struct inode *inode;
223 int error;
224
225 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, blktype);
226 if (IS_ERR(inode))
227 return inode;
228
229 /* Two extra checks for NFS only */
230 if (no_formal_ino) {
231 error = -ESTALE;
232 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
233 goto fail_iput;
234
235 error = -EIO;
236 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
237 goto fail_iput;
238 }
239 return inode;
240
241 fail_iput:
242 iput(inode);
243 return ERR_PTR(error);
244 }
245
246
247 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
248 {
249 struct qstr qstr;
250 struct inode *inode;
251 gfs2_str2qstr(&qstr, name);
252 inode = gfs2_lookupi(dip, &qstr, 1);
253 /* gfs2_lookupi has inconsistent callers: vfs
254 * related routines expect NULL for no entry found,
255 * gfs2_lookup_simple callers expect ENOENT
256 * and do not check for NULL.
257 */
258 if (inode == NULL)
259 return ERR_PTR(-ENOENT);
260 else
261 return inode;
262 }
263
264
265 /**
266 * gfs2_lookupi - Look up a filename in a directory and return its inode
267 * @d_gh: An initialized holder for the directory glock
268 * @name: The name of the inode to look for
269 * @is_root: If 1, ignore the caller's permissions
270 * @i_gh: An uninitialized holder for the new inode glock
271 *
272 * This can be called via the VFS filldir function when NFS is doing
273 * a readdirplus and the inode which its intending to stat isn't
274 * already in cache. In this case we must not take the directory glock
275 * again, since the readdir call will have already taken that lock.
276 *
277 * Returns: errno
278 */
279
280 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
281 int is_root)
282 {
283 struct super_block *sb = dir->i_sb;
284 struct gfs2_inode *dip = GFS2_I(dir);
285 struct gfs2_holder d_gh;
286 int error = 0;
287 struct inode *inode = NULL;
288
289 gfs2_holder_mark_uninitialized(&d_gh);
290 if (!name->len || name->len > GFS2_FNAMESIZE)
291 return ERR_PTR(-ENAMETOOLONG);
292
293 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
294 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
295 dir == d_inode(sb->s_root))) {
296 igrab(dir);
297 return dir;
298 }
299
300 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
301 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
302 if (error)
303 return ERR_PTR(error);
304 }
305
306 if (!is_root) {
307 error = gfs2_permission(dir, MAY_EXEC);
308 if (error)
309 goto out;
310 }
311
312 inode = gfs2_dir_search(dir, name, false);
313 if (IS_ERR(inode))
314 error = PTR_ERR(inode);
315 out:
316 if (gfs2_holder_initialized(&d_gh))
317 gfs2_glock_dq_uninit(&d_gh);
318 if (error == -ENOENT)
319 return NULL;
320 return inode ? inode : ERR_PTR(error);
321 }
322
323 /**
324 * create_ok - OK to create a new on-disk inode here?
325 * @dip: Directory in which dinode is to be created
326 * @name: Name of new dinode
327 * @mode:
328 *
329 * Returns: errno
330 */
331
332 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
333 umode_t mode)
334 {
335 int error;
336
337 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
338 if (error)
339 return error;
340
341 /* Don't create entries in an unlinked directory */
342 if (!dip->i_inode.i_nlink)
343 return -ENOENT;
344
345 if (dip->i_entries == (u32)-1)
346 return -EFBIG;
347 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
348 return -EMLINK;
349
350 return 0;
351 }
352
353 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
354 struct inode *inode)
355 {
356 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
357 (dip->i_inode.i_mode & S_ISUID) &&
358 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
359 if (S_ISDIR(inode->i_mode))
360 inode->i_mode |= S_ISUID;
361 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
362 inode->i_mode &= ~07111;
363 inode->i_uid = dip->i_inode.i_uid;
364 } else
365 inode->i_uid = current_fsuid();
366
367 if (dip->i_inode.i_mode & S_ISGID) {
368 if (S_ISDIR(inode->i_mode))
369 inode->i_mode |= S_ISGID;
370 inode->i_gid = dip->i_inode.i_gid;
371 } else
372 inode->i_gid = current_fsgid();
373 }
374
375 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
376 {
377 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
378 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
379 int error;
380
381 error = gfs2_quota_lock_check(ip, &ap);
382 if (error)
383 goto out;
384
385 error = gfs2_inplace_reserve(ip, &ap);
386 if (error)
387 goto out_quota;
388
389 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
390 if (error)
391 goto out_ipreserv;
392
393 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
394 ip->i_no_formal_ino = ip->i_generation;
395 ip->i_inode.i_ino = ip->i_no_addr;
396 ip->i_goal = ip->i_no_addr;
397
398 gfs2_trans_end(sdp);
399
400 out_ipreserv:
401 gfs2_inplace_release(ip);
402 out_quota:
403 gfs2_quota_unlock(ip);
404 out:
405 return error;
406 }
407
408 static void gfs2_init_dir(struct buffer_head *dibh,
409 const struct gfs2_inode *parent)
410 {
411 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
412 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
413
414 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
415 dent->de_inum = di->di_num; /* already GFS2 endian */
416 dent->de_type = cpu_to_be16(DT_DIR);
417
418 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
419 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
420 gfs2_inum_out(parent, dent);
421 dent->de_type = cpu_to_be16(DT_DIR);
422
423 }
424
425 /**
426 * gfs2_init_xattr - Initialise an xattr block for a new inode
427 * @ip: The inode in question
428 *
429 * This sets up an empty xattr block for a new inode, ready to
430 * take any ACLs, LSM xattrs, etc.
431 */
432
433 static void gfs2_init_xattr(struct gfs2_inode *ip)
434 {
435 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
436 struct buffer_head *bh;
437 struct gfs2_ea_header *ea;
438
439 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
440 gfs2_trans_add_meta(ip->i_gl, bh);
441 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
442 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
443
444 ea = GFS2_EA_BH2FIRST(bh);
445 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
446 ea->ea_type = GFS2_EATYPE_UNUSED;
447 ea->ea_flags = GFS2_EAFLAG_LAST;
448
449 brelse(bh);
450 }
451
452 /**
453 * init_dinode - Fill in a new dinode structure
454 * @dip: The directory this inode is being created in
455 * @ip: The inode
456 * @symname: The symlink destination (if a symlink)
457 * @bhp: The buffer head (returned to caller)
458 *
459 */
460
461 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
462 const char *symname)
463 {
464 struct gfs2_dinode *di;
465 struct buffer_head *dibh;
466
467 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
468 gfs2_trans_add_meta(ip->i_gl, dibh);
469 di = (struct gfs2_dinode *)dibh->b_data;
470 gfs2_dinode_out(ip, di);
471
472 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
473 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
474 di->__pad1 = 0;
475 di->__pad2 = 0;
476 di->__pad3 = 0;
477 memset(&di->__pad4, 0, sizeof(di->__pad4));
478 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
479 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
480
481 switch(ip->i_inode.i_mode & S_IFMT) {
482 case S_IFDIR:
483 gfs2_init_dir(dibh, dip);
484 break;
485 case S_IFLNK:
486 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
487 break;
488 }
489
490 set_buffer_uptodate(dibh);
491 brelse(dibh);
492 }
493
494 /**
495 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
496 * @dip: The directory we are linking into
497 * @da: The dir add information
498 * @nr_inodes: The number of inodes involved
499 *
500 * This calculate the number of blocks we need to reserve in a
501 * transaction to link @nr_inodes into a directory. In most cases
502 * @nr_inodes will be 2 (the directory plus the inode being linked in)
503 * but in case of rename, 4 may be required.
504 *
505 * Returns: Number of blocks
506 */
507
508 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
509 const struct gfs2_diradd *da,
510 unsigned nr_inodes)
511 {
512 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
513 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
514 }
515
516 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
517 struct gfs2_inode *ip, struct gfs2_diradd *da)
518 {
519 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
520 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
521 int error;
522
523 if (da->nr_blocks) {
524 error = gfs2_quota_lock_check(dip, &ap);
525 if (error)
526 goto fail_quota_locks;
527
528 error = gfs2_inplace_reserve(dip, &ap);
529 if (error)
530 goto fail_quota_locks;
531
532 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
533 if (error)
534 goto fail_ipreserv;
535 } else {
536 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
537 if (error)
538 goto fail_quota_locks;
539 }
540
541 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
542
543 gfs2_trans_end(sdp);
544 fail_ipreserv:
545 gfs2_inplace_release(dip);
546 fail_quota_locks:
547 gfs2_quota_unlock(dip);
548 return error;
549 }
550
551 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
552 void *fs_info)
553 {
554 const struct xattr *xattr;
555 int err = 0;
556
557 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
558 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
559 xattr->value_len, 0,
560 GFS2_EATYPE_SECURITY);
561 if (err < 0)
562 break;
563 }
564 return err;
565 }
566
567 /**
568 * gfs2_create_inode - Create a new inode
569 * @dir: The parent directory
570 * @dentry: The new dentry
571 * @file: If non-NULL, the file which is being opened
572 * @mode: The permissions on the new inode
573 * @dev: For device nodes, this is the device number
574 * @symname: For symlinks, this is the link destination
575 * @size: The initial size of the inode (ignored for directories)
576 *
577 * Returns: 0 on success, or error code
578 */
579
580 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
581 struct file *file,
582 umode_t mode, dev_t dev, const char *symname,
583 unsigned int size, int excl, int *opened)
584 {
585 const struct qstr *name = &dentry->d_name;
586 struct posix_acl *default_acl, *acl;
587 struct gfs2_holder ghs[2];
588 struct inode *inode = NULL;
589 struct gfs2_inode *dip = GFS2_I(dir), *ip;
590 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
591 struct gfs2_glock *io_gl = NULL;
592 int error, free_vfs_inode = 1;
593 u32 aflags = 0;
594 unsigned blocks = 1;
595 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
596
597 if (!name->len || name->len > GFS2_FNAMESIZE)
598 return -ENAMETOOLONG;
599
600 error = gfs2_rsqa_alloc(dip);
601 if (error)
602 return error;
603
604 error = gfs2_rindex_update(sdp);
605 if (error)
606 return error;
607
608 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
609 if (error)
610 goto fail;
611 gfs2_holder_mark_uninitialized(ghs + 1);
612
613 error = create_ok(dip, name, mode);
614 if (error)
615 goto fail_gunlock;
616
617 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
618 error = PTR_ERR(inode);
619 if (!IS_ERR(inode)) {
620 if (S_ISDIR(inode->i_mode)) {
621 iput(inode);
622 inode = ERR_PTR(-EISDIR);
623 goto fail_gunlock;
624 }
625 d_instantiate(dentry, inode);
626 error = 0;
627 if (file) {
628 if (S_ISREG(inode->i_mode))
629 error = finish_open(file, dentry, gfs2_open_common, opened);
630 else
631 error = finish_no_open(file, NULL);
632 }
633 gfs2_glock_dq_uninit(ghs);
634 return error;
635 } else if (error != -ENOENT) {
636 goto fail_gunlock;
637 }
638
639 error = gfs2_diradd_alloc_required(dir, name, &da);
640 if (error < 0)
641 goto fail_gunlock;
642
643 inode = new_inode(sdp->sd_vfs);
644 error = -ENOMEM;
645 if (!inode)
646 goto fail_gunlock;
647
648 error = posix_acl_create(dir, &mode, &default_acl, &acl);
649 if (error)
650 goto fail_gunlock;
651
652 ip = GFS2_I(inode);
653 error = gfs2_rsqa_alloc(ip);
654 if (error)
655 goto fail_free_acls;
656
657 inode->i_mode = mode;
658 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
659 inode->i_rdev = dev;
660 inode->i_size = size;
661 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
662 gfs2_set_inode_blocks(inode, 1);
663 munge_mode_uid_gid(dip, inode);
664 check_and_update_goal(dip);
665 ip->i_goal = dip->i_goal;
666 ip->i_diskflags = 0;
667 ip->i_eattr = 0;
668 ip->i_height = 0;
669 ip->i_depth = 0;
670 ip->i_entries = 0;
671 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
672
673 switch(mode & S_IFMT) {
674 case S_IFREG:
675 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
676 gfs2_tune_get(sdp, gt_new_files_jdata))
677 ip->i_diskflags |= GFS2_DIF_JDATA;
678 gfs2_set_aops(inode);
679 break;
680 case S_IFDIR:
681 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
682 ip->i_diskflags |= GFS2_DIF_JDATA;
683 ip->i_entries = 2;
684 break;
685 }
686
687 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
688 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
689 ip->i_diskflags |= GFS2_DIF_SYSTEM;
690
691 gfs2_set_inode_flags(inode);
692
693 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
694 (dip->i_diskflags & GFS2_DIF_TOPDIR))
695 aflags |= GFS2_AF_ORLOV;
696
697 if (default_acl || acl)
698 blocks++;
699
700 error = alloc_dinode(ip, aflags, &blocks);
701 if (error)
702 goto fail_free_inode;
703
704 gfs2_set_inode_blocks(inode, blocks);
705
706 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
707 if (error)
708 goto fail_free_inode;
709 flush_delayed_work(&ip->i_gl->gl_work);
710 glock_set_object(ip->i_gl, ip);
711
712 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
713 if (error)
714 goto fail_free_inode;
715
716 error = gfs2_trans_begin(sdp, blocks, 0);
717 if (error)
718 goto fail_gunlock2;
719
720 if (blocks > 1) {
721 ip->i_eattr = ip->i_no_addr + 1;
722 gfs2_init_xattr(ip);
723 }
724 init_dinode(dip, ip, symname);
725 gfs2_trans_end(sdp);
726
727 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
728 if (error)
729 goto fail_gunlock2;
730
731 BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));
732
733 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
734 if (error)
735 goto fail_gunlock2;
736
737 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
738 gfs2_glock_put(io_gl);
739 gfs2_set_iop(inode);
740 insert_inode_hash(inode);
741
742 free_vfs_inode = 0; /* After this point, the inode is no longer
743 considered free. Any failures need to undo
744 the gfs2 structures. */
745 if (default_acl) {
746 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
747 posix_acl_release(default_acl);
748 }
749 if (acl) {
750 if (!error)
751 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
752 posix_acl_release(acl);
753 }
754
755 if (error)
756 goto fail_gunlock3;
757
758 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
759 &gfs2_initxattrs, NULL);
760 if (error)
761 goto fail_gunlock3;
762
763 error = link_dinode(dip, name, ip, &da);
764 if (error)
765 goto fail_gunlock3;
766
767 mark_inode_dirty(inode);
768 d_instantiate(dentry, inode);
769 if (file) {
770 *opened |= FILE_CREATED;
771 error = finish_open(file, dentry, gfs2_open_common, opened);
772 }
773 gfs2_glock_dq_uninit(ghs);
774 gfs2_glock_dq_uninit(ghs + 1);
775 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
776 return error;
777
778 fail_gunlock3:
779 glock_clear_object(io_gl, ip);
780 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
781 gfs2_glock_put(io_gl);
782 fail_gunlock2:
783 if (io_gl)
784 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
785 fail_free_inode:
786 if (ip->i_gl) {
787 glock_clear_object(ip->i_gl, ip);
788 gfs2_glock_put(ip->i_gl);
789 }
790 gfs2_rsqa_delete(ip, NULL);
791 fail_free_acls:
792 if (default_acl)
793 posix_acl_release(default_acl);
794 if (acl)
795 posix_acl_release(acl);
796 fail_gunlock:
797 gfs2_dir_no_add(&da);
798 gfs2_glock_dq_uninit(ghs);
799 if (inode && !IS_ERR(inode)) {
800 clear_nlink(inode);
801 if (!free_vfs_inode)
802 mark_inode_dirty(inode);
803 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
804 &GFS2_I(inode)->i_flags);
805 iput(inode);
806 }
807 if (gfs2_holder_initialized(ghs + 1))
808 gfs2_glock_dq_uninit(ghs + 1);
809 fail:
810 return error;
811 }
812
813 /**
814 * gfs2_create - Create a file
815 * @dir: The directory in which to create the file
816 * @dentry: The dentry of the new file
817 * @mode: The mode of the new file
818 *
819 * Returns: errno
820 */
821
822 static int gfs2_create(struct inode *dir, struct dentry *dentry,
823 umode_t mode, bool excl)
824 {
825 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
826 }
827
828 /**
829 * __gfs2_lookup - Look up a filename in a directory and return its inode
830 * @dir: The directory inode
831 * @dentry: The dentry of the new inode
832 * @file: File to be opened
833 * @opened: atomic_open flags
834 *
835 *
836 * Returns: errno
837 */
838
839 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
840 struct file *file, int *opened)
841 {
842 struct inode *inode;
843 struct dentry *d;
844 struct gfs2_holder gh;
845 struct gfs2_glock *gl;
846 int error;
847
848 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
849 if (inode == NULL) {
850 d_add(dentry, NULL);
851 return NULL;
852 }
853 if (IS_ERR(inode))
854 return ERR_CAST(inode);
855
856 gl = GFS2_I(inode)->i_gl;
857 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
858 if (error) {
859 iput(inode);
860 return ERR_PTR(error);
861 }
862
863 d = d_splice_alias(inode, dentry);
864 if (IS_ERR(d)) {
865 gfs2_glock_dq_uninit(&gh);
866 return d;
867 }
868 if (file && S_ISREG(inode->i_mode))
869 error = finish_open(file, dentry, gfs2_open_common, opened);
870
871 gfs2_glock_dq_uninit(&gh);
872 if (error) {
873 dput(d);
874 return ERR_PTR(error);
875 }
876 return d;
877 }
878
879 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
880 unsigned flags)
881 {
882 return __gfs2_lookup(dir, dentry, NULL, NULL);
883 }
884
885 /**
886 * gfs2_link - Link to a file
887 * @old_dentry: The inode to link
888 * @dir: Add link to this directory
889 * @dentry: The name of the link
890 *
891 * Link the inode in "old_dentry" into the directory "dir" with the
892 * name in "dentry".
893 *
894 * Returns: errno
895 */
896
897 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
898 struct dentry *dentry)
899 {
900 struct gfs2_inode *dip = GFS2_I(dir);
901 struct gfs2_sbd *sdp = GFS2_SB(dir);
902 struct inode *inode = d_inode(old_dentry);
903 struct gfs2_inode *ip = GFS2_I(inode);
904 struct gfs2_holder ghs[2];
905 struct buffer_head *dibh;
906 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
907 int error;
908
909 if (S_ISDIR(inode->i_mode))
910 return -EPERM;
911
912 error = gfs2_rsqa_alloc(dip);
913 if (error)
914 return error;
915
916 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
917 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
918
919 error = gfs2_glock_nq(ghs); /* parent */
920 if (error)
921 goto out_parent;
922
923 error = gfs2_glock_nq(ghs + 1); /* child */
924 if (error)
925 goto out_child;
926
927 error = -ENOENT;
928 if (inode->i_nlink == 0)
929 goto out_gunlock;
930
931 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
932 if (error)
933 goto out_gunlock;
934
935 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
936 switch (error) {
937 case -ENOENT:
938 break;
939 case 0:
940 error = -EEXIST;
941 default:
942 goto out_gunlock;
943 }
944
945 error = -EINVAL;
946 if (!dip->i_inode.i_nlink)
947 goto out_gunlock;
948 error = -EFBIG;
949 if (dip->i_entries == (u32)-1)
950 goto out_gunlock;
951 error = -EPERM;
952 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
953 goto out_gunlock;
954 error = -EINVAL;
955 if (!ip->i_inode.i_nlink)
956 goto out_gunlock;
957 error = -EMLINK;
958 if (ip->i_inode.i_nlink == (u32)-1)
959 goto out_gunlock;
960
961 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
962 if (error < 0)
963 goto out_gunlock;
964
965 if (da.nr_blocks) {
966 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
967 error = gfs2_quota_lock_check(dip, &ap);
968 if (error)
969 goto out_gunlock;
970
971 error = gfs2_inplace_reserve(dip, &ap);
972 if (error)
973 goto out_gunlock_q;
974
975 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
976 if (error)
977 goto out_ipres;
978 } else {
979 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
980 if (error)
981 goto out_ipres;
982 }
983
984 error = gfs2_meta_inode_buffer(ip, &dibh);
985 if (error)
986 goto out_end_trans;
987
988 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
989 if (error)
990 goto out_brelse;
991
992 gfs2_trans_add_meta(ip->i_gl, dibh);
993 inc_nlink(&ip->i_inode);
994 ip->i_inode.i_ctime = current_time(&ip->i_inode);
995 ihold(inode);
996 d_instantiate(dentry, inode);
997 mark_inode_dirty(inode);
998
999 out_brelse:
1000 brelse(dibh);
1001 out_end_trans:
1002 gfs2_trans_end(sdp);
1003 out_ipres:
1004 if (da.nr_blocks)
1005 gfs2_inplace_release(dip);
1006 out_gunlock_q:
1007 if (da.nr_blocks)
1008 gfs2_quota_unlock(dip);
1009 out_gunlock:
1010 gfs2_dir_no_add(&da);
1011 gfs2_glock_dq(ghs + 1);
1012 out_child:
1013 gfs2_glock_dq(ghs);
1014 out_parent:
1015 gfs2_holder_uninit(ghs);
1016 gfs2_holder_uninit(ghs + 1);
1017 return error;
1018 }
1019
1020 /*
1021 * gfs2_unlink_ok - check to see that a inode is still in a directory
1022 * @dip: the directory
1023 * @name: the name of the file
1024 * @ip: the inode
1025 *
1026 * Assumes that the lock on (at least) @dip is held.
1027 *
1028 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1029 */
1030
1031 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1032 const struct gfs2_inode *ip)
1033 {
1034 int error;
1035
1036 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1037 return -EPERM;
1038
1039 if ((dip->i_inode.i_mode & S_ISVTX) &&
1040 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1041 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1042 return -EPERM;
1043
1044 if (IS_APPEND(&dip->i_inode))
1045 return -EPERM;
1046
1047 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1048 if (error)
1049 return error;
1050
1051 return gfs2_dir_check(&dip->i_inode, name, ip);
1052 }
1053
1054 /**
1055 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1056 * @dip: The parent directory
1057 * @name: The name of the entry in the parent directory
1058 * @inode: The inode to be removed
1059 *
1060 * Called with all the locks and in a transaction. This will only be
1061 * called for a directory after it has been checked to ensure it is empty.
1062 *
1063 * Returns: 0 on success, or an error
1064 */
1065
1066 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1067 const struct dentry *dentry)
1068 {
1069 struct inode *inode = d_inode(dentry);
1070 struct gfs2_inode *ip = GFS2_I(inode);
1071 int error;
1072
1073 error = gfs2_dir_del(dip, dentry);
1074 if (error)
1075 return error;
1076
1077 ip->i_entries = 0;
1078 inode->i_ctime = current_time(inode);
1079 if (S_ISDIR(inode->i_mode))
1080 clear_nlink(inode);
1081 else
1082 drop_nlink(inode);
1083 mark_inode_dirty(inode);
1084 if (inode->i_nlink == 0)
1085 gfs2_unlink_di(inode);
1086 return 0;
1087 }
1088
1089
1090 /**
1091 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1092 * @dir: The inode of the directory containing the inode to unlink
1093 * @dentry: The file itself
1094 *
1095 * This routine uses the type of the inode as a flag to figure out
1096 * whether this is an unlink or an rmdir.
1097 *
1098 * Returns: errno
1099 */
1100
1101 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1102 {
1103 struct gfs2_inode *dip = GFS2_I(dir);
1104 struct gfs2_sbd *sdp = GFS2_SB(dir);
1105 struct inode *inode = d_inode(dentry);
1106 struct gfs2_inode *ip = GFS2_I(inode);
1107 struct gfs2_holder ghs[3];
1108 struct gfs2_rgrpd *rgd;
1109 int error;
1110
1111 error = gfs2_rindex_update(sdp);
1112 if (error)
1113 return error;
1114
1115 error = -EROFS;
1116
1117 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1118 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1119
1120 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1121 if (!rgd)
1122 goto out_inodes;
1123
1124 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1125
1126
1127 error = gfs2_glock_nq(ghs); /* parent */
1128 if (error)
1129 goto out_parent;
1130
1131 error = gfs2_glock_nq(ghs + 1); /* child */
1132 if (error)
1133 goto out_child;
1134
1135 error = -ENOENT;
1136 if (inode->i_nlink == 0)
1137 goto out_rgrp;
1138
1139 if (S_ISDIR(inode->i_mode)) {
1140 error = -ENOTEMPTY;
1141 if (ip->i_entries > 2 || inode->i_nlink > 2)
1142 goto out_rgrp;
1143 }
1144
1145 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1146 if (error)
1147 goto out_rgrp;
1148
1149 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1150 if (error)
1151 goto out_gunlock;
1152
1153 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1154 if (error)
1155 goto out_gunlock;
1156
1157 error = gfs2_unlink_inode(dip, dentry);
1158 gfs2_trans_end(sdp);
1159
1160 out_gunlock:
1161 gfs2_glock_dq(ghs + 2);
1162 out_rgrp:
1163 gfs2_glock_dq(ghs + 1);
1164 out_child:
1165 gfs2_glock_dq(ghs);
1166 out_parent:
1167 gfs2_holder_uninit(ghs + 2);
1168 out_inodes:
1169 gfs2_holder_uninit(ghs + 1);
1170 gfs2_holder_uninit(ghs);
1171 return error;
1172 }
1173
1174 /**
1175 * gfs2_symlink - Create a symlink
1176 * @dir: The directory to create the symlink in
1177 * @dentry: The dentry to put the symlink in
1178 * @symname: The thing which the link points to
1179 *
1180 * Returns: errno
1181 */
1182
1183 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1184 const char *symname)
1185 {
1186 unsigned int size;
1187
1188 size = strlen(symname);
1189 if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1190 return -ENAMETOOLONG;
1191
1192 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1193 }
1194
1195 /**
1196 * gfs2_mkdir - Make a directory
1197 * @dir: The parent directory of the new one
1198 * @dentry: The dentry of the new directory
1199 * @mode: The mode of the new directory
1200 *
1201 * Returns: errno
1202 */
1203
1204 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1205 {
1206 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1207 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1208 }
1209
1210 /**
1211 * gfs2_mknod - Make a special file
1212 * @dir: The directory in which the special file will reside
1213 * @dentry: The dentry of the special file
1214 * @mode: The mode of the special file
1215 * @dev: The device specification of the special file
1216 *
1217 */
1218
1219 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1220 dev_t dev)
1221 {
1222 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1223 }
1224
1225 /**
1226 * gfs2_atomic_open - Atomically open a file
1227 * @dir: The directory
1228 * @dentry: The proposed new entry
1229 * @file: The proposed new struct file
1230 * @flags: open flags
1231 * @mode: File mode
1232 * @opened: Flag to say whether the file has been opened or not
1233 *
1234 * Returns: error code or 0 for success
1235 */
1236
1237 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1238 struct file *file, unsigned flags,
1239 umode_t mode, int *opened)
1240 {
1241 struct dentry *d;
1242 bool excl = !!(flags & O_EXCL);
1243
1244 if (!d_in_lookup(dentry))
1245 goto skip_lookup;
1246
1247 d = __gfs2_lookup(dir, dentry, file, opened);
1248 if (IS_ERR(d))
1249 return PTR_ERR(d);
1250 if (d != NULL)
1251 dentry = d;
1252 if (d_really_is_positive(dentry)) {
1253 if (!(*opened & FILE_OPENED))
1254 return finish_no_open(file, d);
1255 dput(d);
1256 return 0;
1257 }
1258
1259 BUG_ON(d != NULL);
1260
1261 skip_lookup:
1262 if (!(flags & O_CREAT))
1263 return -ENOENT;
1264
1265 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1266 }
1267
1268 /*
1269 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1270 * @this: move this
1271 * @to: to here
1272 *
1273 * Follow @to back to the root and make sure we don't encounter @this
1274 * Assumes we already hold the rename lock.
1275 *
1276 * Returns: errno
1277 */
1278
1279 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1280 {
1281 struct inode *dir = &to->i_inode;
1282 struct super_block *sb = dir->i_sb;
1283 struct inode *tmp;
1284 int error = 0;
1285
1286 igrab(dir);
1287
1288 for (;;) {
1289 if (dir == &this->i_inode) {
1290 error = -EINVAL;
1291 break;
1292 }
1293 if (dir == d_inode(sb->s_root)) {
1294 error = 0;
1295 break;
1296 }
1297
1298 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1299 if (!tmp) {
1300 error = -ENOENT;
1301 break;
1302 }
1303 if (IS_ERR(tmp)) {
1304 error = PTR_ERR(tmp);
1305 break;
1306 }
1307
1308 iput(dir);
1309 dir = tmp;
1310 }
1311
1312 iput(dir);
1313
1314 return error;
1315 }
1316
1317 /**
1318 * update_moved_ino - Update an inode that's being moved
1319 * @ip: The inode being moved
1320 * @ndip: The parent directory of the new filename
1321 * @dir_rename: True of ip is a directory
1322 *
1323 * Returns: errno
1324 */
1325
1326 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1327 int dir_rename)
1328 {
1329 if (dir_rename)
1330 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1331
1332 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1333 mark_inode_dirty_sync(&ip->i_inode);
1334 return 0;
1335 }
1336
1337
1338 /**
1339 * gfs2_rename - Rename a file
1340 * @odir: Parent directory of old file name
1341 * @odentry: The old dentry of the file
1342 * @ndir: Parent directory of new file name
1343 * @ndentry: The new dentry of the file
1344 *
1345 * Returns: errno
1346 */
1347
1348 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1349 struct inode *ndir, struct dentry *ndentry)
1350 {
1351 struct gfs2_inode *odip = GFS2_I(odir);
1352 struct gfs2_inode *ndip = GFS2_I(ndir);
1353 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1354 struct gfs2_inode *nip = NULL;
1355 struct gfs2_sbd *sdp = GFS2_SB(odir);
1356 struct gfs2_holder ghs[5], r_gh;
1357 struct gfs2_rgrpd *nrgd;
1358 unsigned int num_gh;
1359 int dir_rename = 0;
1360 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1361 unsigned int x;
1362 int error;
1363
1364 gfs2_holder_mark_uninitialized(&r_gh);
1365 if (d_really_is_positive(ndentry)) {
1366 nip = GFS2_I(d_inode(ndentry));
1367 if (ip == nip)
1368 return 0;
1369 }
1370
1371 error = gfs2_rindex_update(sdp);
1372 if (error)
1373 return error;
1374
1375 error = gfs2_rsqa_alloc(ndip);
1376 if (error)
1377 return error;
1378
1379 if (odip != ndip) {
1380 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1381 0, &r_gh);
1382 if (error)
1383 goto out;
1384
1385 if (S_ISDIR(ip->i_inode.i_mode)) {
1386 dir_rename = 1;
1387 /* don't move a directory into its subdir */
1388 error = gfs2_ok_to_move(ip, ndip);
1389 if (error)
1390 goto out_gunlock_r;
1391 }
1392 }
1393
1394 num_gh = 1;
1395 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1396 if (odip != ndip) {
1397 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1398 num_gh++;
1399 }
1400 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1401 num_gh++;
1402
1403 if (nip) {
1404 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1405 num_gh++;
1406 /* grab the resource lock for unlink flag twiddling
1407 * this is the case of the target file already existing
1408 * so we unlink before doing the rename
1409 */
1410 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1411 if (nrgd)
1412 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1413 }
1414
1415 for (x = 0; x < num_gh; x++) {
1416 error = gfs2_glock_nq(ghs + x);
1417 if (error)
1418 goto out_gunlock;
1419 }
1420
1421 error = -ENOENT;
1422 if (ip->i_inode.i_nlink == 0)
1423 goto out_gunlock;
1424
1425 /* Check out the old directory */
1426
1427 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1428 if (error)
1429 goto out_gunlock;
1430
1431 /* Check out the new directory */
1432
1433 if (nip) {
1434 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1435 if (error)
1436 goto out_gunlock;
1437
1438 if (nip->i_inode.i_nlink == 0) {
1439 error = -EAGAIN;
1440 goto out_gunlock;
1441 }
1442
1443 if (S_ISDIR(nip->i_inode.i_mode)) {
1444 if (nip->i_entries < 2) {
1445 gfs2_consist_inode(nip);
1446 error = -EIO;
1447 goto out_gunlock;
1448 }
1449 if (nip->i_entries > 2) {
1450 error = -ENOTEMPTY;
1451 goto out_gunlock;
1452 }
1453 }
1454 } else {
1455 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1456 if (error)
1457 goto out_gunlock;
1458
1459 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1460 switch (error) {
1461 case -ENOENT:
1462 error = 0;
1463 break;
1464 case 0:
1465 error = -EEXIST;
1466 default:
1467 goto out_gunlock;
1468 };
1469
1470 if (odip != ndip) {
1471 if (!ndip->i_inode.i_nlink) {
1472 error = -ENOENT;
1473 goto out_gunlock;
1474 }
1475 if (ndip->i_entries == (u32)-1) {
1476 error = -EFBIG;
1477 goto out_gunlock;
1478 }
1479 if (S_ISDIR(ip->i_inode.i_mode) &&
1480 ndip->i_inode.i_nlink == (u32)-1) {
1481 error = -EMLINK;
1482 goto out_gunlock;
1483 }
1484 }
1485 }
1486
1487 /* Check out the dir to be renamed */
1488
1489 if (dir_rename) {
1490 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1491 if (error)
1492 goto out_gunlock;
1493 }
1494
1495 if (nip == NULL) {
1496 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1497 if (error)
1498 goto out_gunlock;
1499 }
1500
1501 if (da.nr_blocks) {
1502 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1503 error = gfs2_quota_lock_check(ndip, &ap);
1504 if (error)
1505 goto out_gunlock;
1506
1507 error = gfs2_inplace_reserve(ndip, &ap);
1508 if (error)
1509 goto out_gunlock_q;
1510
1511 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1512 4 * RES_LEAF + 4, 0);
1513 if (error)
1514 goto out_ipreserv;
1515 } else {
1516 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1517 5 * RES_LEAF + 4, 0);
1518 if (error)
1519 goto out_gunlock;
1520 }
1521
1522 /* Remove the target file, if it exists */
1523
1524 if (nip)
1525 error = gfs2_unlink_inode(ndip, ndentry);
1526
1527 error = update_moved_ino(ip, ndip, dir_rename);
1528 if (error)
1529 goto out_end_trans;
1530
1531 error = gfs2_dir_del(odip, odentry);
1532 if (error)
1533 goto out_end_trans;
1534
1535 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1536 if (error)
1537 goto out_end_trans;
1538
1539 out_end_trans:
1540 gfs2_trans_end(sdp);
1541 out_ipreserv:
1542 if (da.nr_blocks)
1543 gfs2_inplace_release(ndip);
1544 out_gunlock_q:
1545 if (da.nr_blocks)
1546 gfs2_quota_unlock(ndip);
1547 out_gunlock:
1548 gfs2_dir_no_add(&da);
1549 while (x--) {
1550 gfs2_glock_dq(ghs + x);
1551 gfs2_holder_uninit(ghs + x);
1552 }
1553 out_gunlock_r:
1554 if (gfs2_holder_initialized(&r_gh))
1555 gfs2_glock_dq_uninit(&r_gh);
1556 out:
1557 return error;
1558 }
1559
1560 /**
1561 * gfs2_exchange - exchange two files
1562 * @odir: Parent directory of old file name
1563 * @odentry: The old dentry of the file
1564 * @ndir: Parent directory of new file name
1565 * @ndentry: The new dentry of the file
1566 * @flags: The rename flags
1567 *
1568 * Returns: errno
1569 */
1570
1571 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1572 struct inode *ndir, struct dentry *ndentry,
1573 unsigned int flags)
1574 {
1575 struct gfs2_inode *odip = GFS2_I(odir);
1576 struct gfs2_inode *ndip = GFS2_I(ndir);
1577 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1578 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1579 struct gfs2_sbd *sdp = GFS2_SB(odir);
1580 struct gfs2_holder ghs[5], r_gh;
1581 unsigned int num_gh;
1582 unsigned int x;
1583 umode_t old_mode = oip->i_inode.i_mode;
1584 umode_t new_mode = nip->i_inode.i_mode;
1585 int error;
1586
1587 gfs2_holder_mark_uninitialized(&r_gh);
1588 error = gfs2_rindex_update(sdp);
1589 if (error)
1590 return error;
1591
1592 if (odip != ndip) {
1593 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1594 0, &r_gh);
1595 if (error)
1596 goto out;
1597
1598 if (S_ISDIR(old_mode)) {
1599 /* don't move a directory into its subdir */
1600 error = gfs2_ok_to_move(oip, ndip);
1601 if (error)
1602 goto out_gunlock_r;
1603 }
1604
1605 if (S_ISDIR(new_mode)) {
1606 /* don't move a directory into its subdir */
1607 error = gfs2_ok_to_move(nip, odip);
1608 if (error)
1609 goto out_gunlock_r;
1610 }
1611 }
1612
1613 num_gh = 1;
1614 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1615 if (odip != ndip) {
1616 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1617 num_gh++;
1618 }
1619 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1620 num_gh++;
1621
1622 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1623 num_gh++;
1624
1625 for (x = 0; x < num_gh; x++) {
1626 error = gfs2_glock_nq(ghs + x);
1627 if (error)
1628 goto out_gunlock;
1629 }
1630
1631 error = -ENOENT;
1632 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1633 goto out_gunlock;
1634
1635 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1636 if (error)
1637 goto out_gunlock;
1638 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1639 if (error)
1640 goto out_gunlock;
1641
1642 if (S_ISDIR(old_mode)) {
1643 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1644 if (error)
1645 goto out_gunlock;
1646 }
1647 if (S_ISDIR(new_mode)) {
1648 error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1649 if (error)
1650 goto out_gunlock;
1651 }
1652 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1653 if (error)
1654 goto out_gunlock;
1655
1656 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1657 if (error)
1658 goto out_end_trans;
1659
1660 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1661 if (error)
1662 goto out_end_trans;
1663
1664 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1665 IF2DT(old_mode));
1666 if (error)
1667 goto out_end_trans;
1668
1669 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1670 IF2DT(new_mode));
1671 if (error)
1672 goto out_end_trans;
1673
1674 if (odip != ndip) {
1675 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1676 inc_nlink(&odip->i_inode);
1677 drop_nlink(&ndip->i_inode);
1678 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1679 inc_nlink(&ndip->i_inode);
1680 drop_nlink(&odip->i_inode);
1681 }
1682 }
1683 mark_inode_dirty(&ndip->i_inode);
1684 if (odip != ndip)
1685 mark_inode_dirty(&odip->i_inode);
1686
1687 out_end_trans:
1688 gfs2_trans_end(sdp);
1689 out_gunlock:
1690 while (x--) {
1691 gfs2_glock_dq(ghs + x);
1692 gfs2_holder_uninit(ghs + x);
1693 }
1694 out_gunlock_r:
1695 if (gfs2_holder_initialized(&r_gh))
1696 gfs2_glock_dq_uninit(&r_gh);
1697 out:
1698 return error;
1699 }
1700
1701 static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1702 struct inode *ndir, struct dentry *ndentry,
1703 unsigned int flags)
1704 {
1705 flags &= ~RENAME_NOREPLACE;
1706
1707 if (flags & ~RENAME_EXCHANGE)
1708 return -EINVAL;
1709
1710 if (flags & RENAME_EXCHANGE)
1711 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1712
1713 return gfs2_rename(odir, odentry, ndir, ndentry);
1714 }
1715
1716 /**
1717 * gfs2_get_link - Follow a symbolic link
1718 * @dentry: The dentry of the link
1719 * @inode: The inode of the link
1720 * @done: destructor for return value
1721 *
1722 * This can handle symlinks of any size.
1723 *
1724 * Returns: 0 on success or error code
1725 */
1726
1727 static const char *gfs2_get_link(struct dentry *dentry,
1728 struct inode *inode,
1729 struct delayed_call *done)
1730 {
1731 struct gfs2_inode *ip = GFS2_I(inode);
1732 struct gfs2_holder i_gh;
1733 struct buffer_head *dibh;
1734 unsigned int size;
1735 char *buf;
1736 int error;
1737
1738 if (!dentry)
1739 return ERR_PTR(-ECHILD);
1740
1741 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1742 error = gfs2_glock_nq(&i_gh);
1743 if (error) {
1744 gfs2_holder_uninit(&i_gh);
1745 return ERR_PTR(error);
1746 }
1747
1748 size = (unsigned int)i_size_read(&ip->i_inode);
1749 if (size == 0) {
1750 gfs2_consist_inode(ip);
1751 buf = ERR_PTR(-EIO);
1752 goto out;
1753 }
1754
1755 error = gfs2_meta_inode_buffer(ip, &dibh);
1756 if (error) {
1757 buf = ERR_PTR(error);
1758 goto out;
1759 }
1760
1761 buf = kzalloc(size + 1, GFP_NOFS);
1762 if (!buf)
1763 buf = ERR_PTR(-ENOMEM);
1764 else
1765 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1766 brelse(dibh);
1767 out:
1768 gfs2_glock_dq_uninit(&i_gh);
1769 if (!IS_ERR(buf))
1770 set_delayed_call(done, kfree_link, buf);
1771 return buf;
1772 }
1773
1774 /**
1775 * gfs2_permission -
1776 * @inode: The inode
1777 * @mask: The mask to be tested
1778 * @flags: Indicates whether this is an RCU path walk or not
1779 *
1780 * This may be called from the VFS directly, or from within GFS2 with the
1781 * inode locked, so we look to see if the glock is already locked and only
1782 * lock the glock if its not already been done.
1783 *
1784 * Returns: errno
1785 */
1786
1787 int gfs2_permission(struct inode *inode, int mask)
1788 {
1789 struct gfs2_inode *ip;
1790 struct gfs2_holder i_gh;
1791 int error;
1792
1793 gfs2_holder_mark_uninitialized(&i_gh);
1794 ip = GFS2_I(inode);
1795 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1796 if (mask & MAY_NOT_BLOCK)
1797 return -ECHILD;
1798 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1799 if (error)
1800 return error;
1801 }
1802
1803 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1804 error = -EPERM;
1805 else
1806 error = generic_permission(inode, mask);
1807 if (gfs2_holder_initialized(&i_gh))
1808 gfs2_glock_dq_uninit(&i_gh);
1809
1810 return error;
1811 }
1812
1813 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1814 {
1815 setattr_copy(inode, attr);
1816 mark_inode_dirty(inode);
1817 return 0;
1818 }
1819
1820 /**
1821 * gfs2_setattr_simple -
1822 * @ip:
1823 * @attr:
1824 *
1825 * Returns: errno
1826 */
1827
1828 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1829 {
1830 int error;
1831
1832 if (current->journal_info)
1833 return __gfs2_setattr_simple(inode, attr);
1834
1835 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1836 if (error)
1837 return error;
1838
1839 error = __gfs2_setattr_simple(inode, attr);
1840 gfs2_trans_end(GFS2_SB(inode));
1841 return error;
1842 }
1843
1844 static int setattr_chown(struct inode *inode, struct iattr *attr)
1845 {
1846 struct gfs2_inode *ip = GFS2_I(inode);
1847 struct gfs2_sbd *sdp = GFS2_SB(inode);
1848 kuid_t ouid, nuid;
1849 kgid_t ogid, ngid;
1850 int error;
1851 struct gfs2_alloc_parms ap;
1852
1853 ouid = inode->i_uid;
1854 ogid = inode->i_gid;
1855 nuid = attr->ia_uid;
1856 ngid = attr->ia_gid;
1857
1858 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1859 ouid = nuid = NO_UID_QUOTA_CHANGE;
1860 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1861 ogid = ngid = NO_GID_QUOTA_CHANGE;
1862
1863 error = gfs2_rsqa_alloc(ip);
1864 if (error)
1865 goto out;
1866
1867 error = gfs2_rindex_update(sdp);
1868 if (error)
1869 goto out;
1870
1871 error = gfs2_quota_lock(ip, nuid, ngid);
1872 if (error)
1873 goto out;
1874
1875 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1876
1877 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1878 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1879 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1880 if (error)
1881 goto out_gunlock_q;
1882 }
1883
1884 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1885 if (error)
1886 goto out_gunlock_q;
1887
1888 error = gfs2_setattr_simple(inode, attr);
1889 if (error)
1890 goto out_end_trans;
1891
1892 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1893 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1894 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1895 gfs2_quota_change(ip, ap.target, nuid, ngid);
1896 }
1897
1898 out_end_trans:
1899 gfs2_trans_end(sdp);
1900 out_gunlock_q:
1901 gfs2_quota_unlock(ip);
1902 out:
1903 return error;
1904 }
1905
1906 /**
1907 * gfs2_setattr - Change attributes on an inode
1908 * @dentry: The dentry which is changing
1909 * @attr: The structure describing the change
1910 *
1911 * The VFS layer wants to change one or more of an inodes attributes. Write
1912 * that change out to disk.
1913 *
1914 * Returns: errno
1915 */
1916
1917 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1918 {
1919 struct inode *inode = d_inode(dentry);
1920 struct gfs2_inode *ip = GFS2_I(inode);
1921 struct gfs2_holder i_gh;
1922 int error;
1923
1924 error = gfs2_rsqa_alloc(ip);
1925 if (error)
1926 return error;
1927
1928 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1929 if (error)
1930 return error;
1931
1932 error = -EPERM;
1933 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1934 goto out;
1935
1936 error = setattr_prepare(dentry, attr);
1937 if (error)
1938 goto out;
1939
1940 if (attr->ia_valid & ATTR_SIZE)
1941 error = gfs2_setattr_size(inode, attr->ia_size);
1942 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1943 error = setattr_chown(inode, attr);
1944 else {
1945 error = gfs2_setattr_simple(inode, attr);
1946 if (!error && attr->ia_valid & ATTR_MODE)
1947 error = posix_acl_chmod(inode, inode->i_mode);
1948 }
1949
1950 out:
1951 if (!error)
1952 mark_inode_dirty(inode);
1953 gfs2_glock_dq_uninit(&i_gh);
1954 return error;
1955 }
1956
1957 /**
1958 * gfs2_getattr - Read out an inode's attributes
1959 * @path: Object to query
1960 * @stat: The inode's stats
1961 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
1962 * @flags: AT_STATX_xxx setting
1963 *
1964 * This may be called from the VFS directly, or from within GFS2 with the
1965 * inode locked, so we look to see if the glock is already locked and only
1966 * lock the glock if its not already been done. Note that its the NFS
1967 * readdirplus operation which causes this to be called (from filldir)
1968 * with the glock already held.
1969 *
1970 * Returns: errno
1971 */
1972
1973 static int gfs2_getattr(const struct path *path, struct kstat *stat,
1974 u32 request_mask, unsigned int flags)
1975 {
1976 struct inode *inode = d_inode(path->dentry);
1977 struct gfs2_inode *ip = GFS2_I(inode);
1978 struct gfs2_holder gh;
1979 u32 gfsflags;
1980 int error;
1981
1982 gfs2_holder_mark_uninitialized(&gh);
1983 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1984 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1985 if (error)
1986 return error;
1987 }
1988
1989 gfsflags = ip->i_diskflags;
1990 if (gfsflags & GFS2_DIF_APPENDONLY)
1991 stat->attributes |= STATX_ATTR_APPEND;
1992 if (gfsflags & GFS2_DIF_IMMUTABLE)
1993 stat->attributes |= STATX_ATTR_IMMUTABLE;
1994
1995 stat->attributes_mask |= (STATX_ATTR_APPEND |
1996 STATX_ATTR_COMPRESSED |
1997 STATX_ATTR_ENCRYPTED |
1998 STATX_ATTR_IMMUTABLE |
1999 STATX_ATTR_NODUMP);
2000
2001 generic_fillattr(inode, stat);
2002
2003 if (gfs2_holder_initialized(&gh))
2004 gfs2_glock_dq_uninit(&gh);
2005
2006 return 0;
2007 }
2008
2009 const struct iomap_ops gfs2_iomap_ops = {
2010 .iomap_begin = gfs2_iomap_begin,
2011 };
2012
2013 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2014 u64 start, u64 len)
2015 {
2016 struct gfs2_inode *ip = GFS2_I(inode);
2017 struct gfs2_holder gh;
2018 int ret;
2019
2020 inode_lock_shared(inode);
2021
2022 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2023 if (ret)
2024 goto out;
2025
2026 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2027
2028 gfs2_glock_dq_uninit(&gh);
2029
2030 out:
2031 inode_unlock_shared(inode);
2032 return ret;
2033 }
2034
2035 loff_t gfs2_seek_data(struct file *file, loff_t offset)
2036 {
2037 struct inode *inode = file->f_mapping->host;
2038 struct gfs2_inode *ip = GFS2_I(inode);
2039 struct gfs2_holder gh;
2040 loff_t ret;
2041
2042 inode_lock_shared(inode);
2043 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2044 if (!ret)
2045 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2046 gfs2_glock_dq_uninit(&gh);
2047 inode_unlock_shared(inode);
2048
2049 if (ret < 0)
2050 return ret;
2051 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2052 }
2053
2054 loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2055 {
2056 struct inode *inode = file->f_mapping->host;
2057 struct gfs2_inode *ip = GFS2_I(inode);
2058 struct gfs2_holder gh;
2059 loff_t ret;
2060
2061 inode_lock_shared(inode);
2062 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2063 if (!ret)
2064 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2065 gfs2_glock_dq_uninit(&gh);
2066 inode_unlock_shared(inode);
2067
2068 if (ret < 0)
2069 return ret;
2070 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2071 }
2072
2073 const struct inode_operations gfs2_file_iops = {
2074 .permission = gfs2_permission,
2075 .setattr = gfs2_setattr,
2076 .getattr = gfs2_getattr,
2077 .listxattr = gfs2_listxattr,
2078 .fiemap = gfs2_fiemap,
2079 .get_acl = gfs2_get_acl,
2080 .set_acl = gfs2_set_acl,
2081 };
2082
2083 const struct inode_operations gfs2_dir_iops = {
2084 .create = gfs2_create,
2085 .lookup = gfs2_lookup,
2086 .link = gfs2_link,
2087 .unlink = gfs2_unlink,
2088 .symlink = gfs2_symlink,
2089 .mkdir = gfs2_mkdir,
2090 .rmdir = gfs2_unlink,
2091 .mknod = gfs2_mknod,
2092 .rename = gfs2_rename2,
2093 .permission = gfs2_permission,
2094 .setattr = gfs2_setattr,
2095 .getattr = gfs2_getattr,
2096 .listxattr = gfs2_listxattr,
2097 .fiemap = gfs2_fiemap,
2098 .get_acl = gfs2_get_acl,
2099 .set_acl = gfs2_set_acl,
2100 .atomic_open = gfs2_atomic_open,
2101 };
2102
2103 const struct inode_operations gfs2_symlink_iops = {
2104 .get_link = gfs2_get_link,
2105 .permission = gfs2_permission,
2106 .setattr = gfs2_setattr,
2107 .getattr = gfs2_getattr,
2108 .listxattr = gfs2_listxattr,
2109 .fiemap = gfs2_fiemap,
2110 };
2111
Linux with added FPC-III support