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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / fs / gfs2 / inode.c
blob6525b804d5ecb6c8a917aeed577272458183af65
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10 #include <linux/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/namei.h>
15 #include <linux/mm.h>
16 #include <linux/xattr.h>
17 #include <linux/posix_acl.h>
18 #include <linux/gfs2_ondisk.h>
19 #include <linux/crc32.h>
20 #include <linux/fiemap.h>
21 #include <linux/security.h>
22 #include <asm/uaccess.h>
23
24 #include "gfs2.h"
25 #include "incore.h"
26 #include "acl.h"
27 #include "bmap.h"
28 #include "dir.h"
29 #include "xattr.h"
30 #include "glock.h"
31 #include "inode.h"
32 #include "meta_io.h"
33 #include "quota.h"
34 #include "rgrp.h"
35 #include "trans.h"
36 #include "util.h"
37 #include "super.h"
38 #include "glops.h"
39
40 struct gfs2_skip_data {
41 u64 no_addr;
42 int skipped;
43 int non_block;
44 };
45
46 static int iget_test(struct inode *inode, void *opaque)
47 {
48 struct gfs2_inode *ip = GFS2_I(inode);
49 struct gfs2_skip_data *data = opaque;
50
51 if (ip->i_no_addr == data->no_addr) {
52 if (data->non_block &&
53 inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
54 data->skipped = 1;
55 return 0;
56 }
57 return 1;
58 }
59 return 0;
60 }
61
62 static int iget_set(struct inode *inode, void *opaque)
63 {
64 struct gfs2_inode *ip = GFS2_I(inode);
65 struct gfs2_skip_data *data = opaque;
66
67 if (data->skipped)
68 return -ENOENT;
69 inode->i_ino = (unsigned long)(data->no_addr);
70 ip->i_no_addr = data->no_addr;
71 return 0;
72 }
73
74 struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block)
75 {
76 unsigned long hash = (unsigned long)no_addr;
77 struct gfs2_skip_data data;
78
79 data.no_addr = no_addr;
80 data.skipped = 0;
81 data.non_block = non_block;
82 return ilookup5(sb, hash, iget_test, &data);
83 }
84
85 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr,
86 int non_block)
87 {
88 struct gfs2_skip_data data;
89 unsigned long hash = (unsigned long)no_addr;
90
91 data.no_addr = no_addr;
92 data.skipped = 0;
93 data.non_block = non_block;
94 return iget5_locked(sb, hash, iget_test, iget_set, &data);
95 }
96
97 /**
98 * gfs2_set_iop - Sets inode operations
99 * @inode: The inode with correct i_mode filled in
100 *
101 * GFS2 lookup code fills in vfs inode contents based on info obtained
102 * from directory entry inside gfs2_inode_lookup().
103 */
104
105 static void gfs2_set_iop(struct inode *inode)
106 {
107 struct gfs2_sbd *sdp = GFS2_SB(inode);
108 umode_t mode = inode->i_mode;
109
110 if (S_ISREG(mode)) {
111 inode->i_op = &gfs2_file_iops;
112 if (gfs2_localflocks(sdp))
113 inode->i_fop = &gfs2_file_fops_nolock;
114 else
115 inode->i_fop = &gfs2_file_fops;
116 } else if (S_ISDIR(mode)) {
117 inode->i_op = &gfs2_dir_iops;
118 if (gfs2_localflocks(sdp))
119 inode->i_fop = &gfs2_dir_fops_nolock;
120 else
121 inode->i_fop = &gfs2_dir_fops;
122 } else if (S_ISLNK(mode)) {
123 inode->i_op = &gfs2_symlink_iops;
124 } else {
125 inode->i_op = &gfs2_file_iops;
126 init_special_inode(inode, inode->i_mode, inode->i_rdev);
127 }
128 }
129
130 /**
131 * gfs2_inode_lookup - Lookup an inode
132 * @sb: The super block
133 * @no_addr: The inode number
134 * @type: The type of the inode
135 * non_block: Can we block on inodes that are being freed?
136 *
137 * Returns: A VFS inode, or an error
138 */
139
140 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
141 u64 no_addr, u64 no_formal_ino, int non_block)
142 {
143 struct inode *inode;
144 struct gfs2_inode *ip;
145 struct gfs2_glock *io_gl = NULL;
146 int error;
147
148 inode = gfs2_iget(sb, no_addr, non_block);
149 ip = GFS2_I(inode);
150
151 if (!inode)
152 return ERR_PTR(-ENOBUFS);
153
154 if (inode->i_state & I_NEW) {
155 struct gfs2_sbd *sdp = GFS2_SB(inode);
156 ip->i_no_formal_ino = no_formal_ino;
157
158 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
159 if (unlikely(error))
160 goto fail;
161 ip->i_gl->gl_object = ip;
162
163 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
164 if (unlikely(error))
165 goto fail_put;
166
167 set_bit(GIF_INVALID, &ip->i_flags);
168 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
169 if (unlikely(error))
170 goto fail_iopen;
171
172 ip->i_iopen_gh.gh_gl->gl_object = ip;
173 gfs2_glock_put(io_gl);
174 io_gl = NULL;
175
176 if (type == DT_UNKNOWN) {
177 /* Inode glock must be locked already */
178 error = gfs2_inode_refresh(GFS2_I(inode));
179 if (error)
180 goto fail_refresh;
181 } else {
182 inode->i_mode = DT2IF(type);
183 }
184
185 gfs2_set_iop(inode);
186 unlock_new_inode(inode);
187 }
188
189 return inode;
190
191 fail_refresh:
192 ip->i_iopen_gh.gh_gl->gl_object = NULL;
193 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
194 fail_iopen:
195 if (io_gl)
196 gfs2_glock_put(io_gl);
197 fail_put:
198 ip->i_gl->gl_object = NULL;
199 gfs2_glock_put(ip->i_gl);
200 fail:
201 iget_failed(inode);
202 return ERR_PTR(error);
203 }
204
205 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
206 u64 *no_formal_ino, unsigned int blktype)
207 {
208 struct super_block *sb = sdp->sd_vfs;
209 struct gfs2_holder i_gh;
210 struct inode *inode = NULL;
211 int error;
212
213 /* Must not read in block until block type is verified */
214 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
215 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
216 if (error)
217 return ERR_PTR(error);
218
219 error = gfs2_check_blk_type(sdp, no_addr, blktype);
220 if (error)
221 goto fail;
222
223 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
224 if (IS_ERR(inode))
225 goto fail;
226
227 /* Two extra checks for NFS only */
228 if (no_formal_ino) {
229 error = -ESTALE;
230 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
231 goto fail_iput;
232
233 error = -EIO;
234 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
235 goto fail_iput;
236
237 error = 0;
238 }
239
240 fail:
241 gfs2_glock_dq_uninit(&i_gh);
242 return error ? ERR_PTR(error) : inode;
243 fail_iput:
244 iput(inode);
245 goto fail;
246 }
247
248
249 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
250 {
251 struct qstr qstr;
252 struct inode *inode;
253 gfs2_str2qstr(&qstr, name);
254 inode = gfs2_lookupi(dip, &qstr, 1);
255 /* gfs2_lookupi has inconsistent callers: vfs
256 * related routines expect NULL for no entry found,
257 * gfs2_lookup_simple callers expect ENOENT
258 * and do not check for NULL.
259 */
260 if (inode == NULL)
261 return ERR_PTR(-ENOENT);
262 else
263 return inode;
264 }
265
266
267 /**
268 * gfs2_lookupi - Look up a filename in a directory and return its inode
269 * @d_gh: An initialized holder for the directory glock
270 * @name: The name of the inode to look for
271 * @is_root: If 1, ignore the caller's permissions
272 * @i_gh: An uninitialized holder for the new inode glock
273 *
274 * This can be called via the VFS filldir function when NFS is doing
275 * a readdirplus and the inode which its intending to stat isn't
276 * already in cache. In this case we must not take the directory glock
277 * again, since the readdir call will have already taken that lock.
278 *
279 * Returns: errno
280 */
281
282 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
283 int is_root)
284 {
285 struct super_block *sb = dir->i_sb;
286 struct gfs2_inode *dip = GFS2_I(dir);
287 struct gfs2_holder d_gh;
288 int error = 0;
289 struct inode *inode = NULL;
290 int unlock = 0;
291
292 if (!name->len || name->len > GFS2_FNAMESIZE)
293 return ERR_PTR(-ENAMETOOLONG);
294
295 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
296 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
297 dir == sb->s_root->d_inode)) {
298 igrab(dir);
299 return dir;
300 }
301
302 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
303 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
304 if (error)
305 return ERR_PTR(error);
306 unlock = 1;
307 }
308
309 if (!is_root) {
310 error = gfs2_permission(dir, MAY_EXEC);
311 if (error)
312 goto out;
313 }
314
315 inode = gfs2_dir_search(dir, name);
316 if (IS_ERR(inode))
317 error = PTR_ERR(inode);
318 out:
319 if (unlock)
320 gfs2_glock_dq_uninit(&d_gh);
321 if (error == -ENOENT)
322 return NULL;
323 return inode ? inode : ERR_PTR(error);
324 }
325
326 /**
327 * create_ok - OK to create a new on-disk inode here?
328 * @dip: Directory in which dinode is to be created
329 * @name: Name of new dinode
330 * @mode:
331 *
332 * Returns: errno
333 */
334
335 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
336 unsigned int mode)
337 {
338 int error;
339
340 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
341 if (error)
342 return error;
343
344 /* Don't create entries in an unlinked directory */
345 if (!dip->i_inode.i_nlink)
346 return -ENOENT;
347
348 error = gfs2_dir_check(&dip->i_inode, name, NULL);
349 switch (error) {
350 case -ENOENT:
351 error = 0;
352 break;
353 case 0:
354 return -EEXIST;
355 default:
356 return error;
357 }
358
359 if (dip->i_entries == (u32)-1)
360 return -EFBIG;
361 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
362 return -EMLINK;
363
364 return 0;
365 }
366
367 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
368 unsigned int *uid, unsigned int *gid)
369 {
370 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
371 (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
372 if (S_ISDIR(*mode))
373 *mode |= S_ISUID;
374 else if (dip->i_inode.i_uid != current_fsuid())
375 *mode &= ~07111;
376 *uid = dip->i_inode.i_uid;
377 } else
378 *uid = current_fsuid();
379
380 if (dip->i_inode.i_mode & S_ISGID) {
381 if (S_ISDIR(*mode))
382 *mode |= S_ISGID;
383 *gid = dip->i_inode.i_gid;
384 } else
385 *gid = current_fsgid();
386 }
387
388 static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
389 {
390 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
391 int error;
392
393 if (gfs2_alloc_get(dip) == NULL)
394 return -ENOMEM;
395
396 dip->i_alloc->al_requested = RES_DINODE;
397 error = gfs2_inplace_reserve(dip);
398 if (error)
399 goto out;
400
401 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
402 if (error)
403 goto out_ipreserv;
404
405 error = gfs2_alloc_di(dip, no_addr, generation);
406
407 gfs2_trans_end(sdp);
408
409 out_ipreserv:
410 gfs2_inplace_release(dip);
411 out:
412 gfs2_alloc_put(dip);
413 return error;
414 }
415
416 static void gfs2_init_dir(struct buffer_head *dibh,
417 const struct gfs2_inode *parent)
418 {
419 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
420 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
421
422 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
423 dent->de_inum = di->di_num; /* already GFS2 endian */
424 dent->de_type = cpu_to_be16(DT_DIR);
425
426 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
427 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
428 gfs2_inum_out(parent, dent);
429 dent->de_type = cpu_to_be16(DT_DIR);
430
431 }
432
433 /**
434 * init_dinode - Fill in a new dinode structure
435 * @dip: The directory this inode is being created in
436 * @gl: The glock covering the new inode
437 * @inum: The inode number
438 * @mode: The file permissions
439 * @uid: The uid of the new inode
440 * @gid: The gid of the new inode
441 * @generation: The generation number of the new inode
442 * @dev: The device number (if a device node)
443 * @symname: The symlink destination (if a symlink)
444 * @size: The inode size (ignored for directories)
445 * @bhp: The buffer head (returned to caller)
446 *
447 */
448
449 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
450 const struct gfs2_inum_host *inum, unsigned int mode,
451 unsigned int uid, unsigned int gid,
452 const u64 *generation, dev_t dev, const char *symname,
453 unsigned size, struct buffer_head **bhp)
454 {
455 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
456 struct gfs2_dinode *di;
457 struct buffer_head *dibh;
458 struct timespec tv = CURRENT_TIME;
459
460 dibh = gfs2_meta_new(gl, inum->no_addr);
461 gfs2_trans_add_bh(gl, dibh, 1);
462 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
463 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
464 di = (struct gfs2_dinode *)dibh->b_data;
465
466 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
467 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
468 di->di_mode = cpu_to_be32(mode);
469 di->di_uid = cpu_to_be32(uid);
470 di->di_gid = cpu_to_be32(gid);
471 di->di_nlink = 0;
472 di->di_size = cpu_to_be64(size);
473 di->di_blocks = cpu_to_be64(1);
474 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec);
475 di->di_major = cpu_to_be32(MAJOR(dev));
476 di->di_minor = cpu_to_be32(MINOR(dev));
477 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
478 di->di_generation = cpu_to_be64(*generation);
479 di->di_flags = 0;
480 di->__pad1 = 0;
481 di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
482 di->di_height = 0;
483 di->__pad2 = 0;
484 di->__pad3 = 0;
485 di->di_depth = 0;
486 di->di_entries = 0;
487 memset(&di->__pad4, 0, sizeof(di->__pad4));
488 di->di_eattr = 0;
489 di->di_atime_nsec = cpu_to_be32(tv.tv_nsec);
490 di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec);
491 di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec);
492 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
493
494 switch(mode & S_IFMT) {
495 case S_IFREG:
496 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
497 gfs2_tune_get(sdp, gt_new_files_jdata))
498 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
499 break;
500 case S_IFDIR:
501 di->di_flags |= cpu_to_be32(dip->i_diskflags &
502 GFS2_DIF_INHERIT_JDATA);
503 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
504 di->di_size = cpu_to_be64(sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode));
505 di->di_entries = cpu_to_be32(2);
506 gfs2_init_dir(dibh, dip);
507 break;
508 case S_IFLNK:
509 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, size);
510 break;
511 }
512
513 set_buffer_uptodate(dibh);
514
515 *bhp = dibh;
516 }
517
518 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
519 unsigned int mode, const struct gfs2_inum_host *inum,
520 const u64 *generation, dev_t dev, const char *symname,
521 unsigned int size, struct buffer_head **bhp)
522 {
523 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
524 unsigned int uid, gid;
525 int error;
526
527 munge_mode_uid_gid(dip, &mode, &uid, &gid);
528 if (!gfs2_alloc_get(dip))
529 return -ENOMEM;
530
531 error = gfs2_quota_lock(dip, uid, gid);
532 if (error)
533 goto out;
534
535 error = gfs2_quota_check(dip, uid, gid);
536 if (error)
537 goto out_quota;
538
539 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
540 if (error)
541 goto out_quota;
542
543 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, symname, size, bhp);
544 gfs2_quota_change(dip, +1, uid, gid);
545 gfs2_trans_end(sdp);
546
547 out_quota:
548 gfs2_quota_unlock(dip);
549 out:
550 gfs2_alloc_put(dip);
551 return error;
552 }
553
554 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
555 struct gfs2_inode *ip)
556 {
557 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
558 struct gfs2_alloc *al;
559 int alloc_required;
560 struct buffer_head *dibh;
561 int error;
562
563 al = gfs2_alloc_get(dip);
564 if (!al)
565 return -ENOMEM;
566
567 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
568 if (error)
569 goto fail;
570
571 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
572 if (alloc_required < 0)
573 goto fail_quota_locks;
574 if (alloc_required) {
575 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
576 if (error)
577 goto fail_quota_locks;
578
579 al->al_requested = sdp->sd_max_dirres;
580
581 error = gfs2_inplace_reserve(dip);
582 if (error)
583 goto fail_quota_locks;
584
585 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
586 al->al_rgd->rd_length +
587 2 * RES_DINODE +
588 RES_STATFS + RES_QUOTA, 0);
589 if (error)
590 goto fail_ipreserv;
591 } else {
592 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
593 if (error)
594 goto fail_quota_locks;
595 }
596
597 error = gfs2_dir_add(&dip->i_inode, name, ip);
598 if (error)
599 goto fail_end_trans;
600
601 error = gfs2_meta_inode_buffer(ip, &dibh);
602 if (error)
603 goto fail_end_trans;
604 inc_nlink(&ip->i_inode);
605 if (S_ISDIR(ip->i_inode.i_mode))
606 inc_nlink(&ip->i_inode);
607 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
608 gfs2_dinode_out(ip, dibh->b_data);
609 brelse(dibh);
610 return 0;
611
612 fail_end_trans:
613 gfs2_trans_end(sdp);
614
615 fail_ipreserv:
616 if (dip->i_alloc->al_rgd)
617 gfs2_inplace_release(dip);
618
619 fail_quota_locks:
620 gfs2_quota_unlock(dip);
621
622 fail:
623 gfs2_alloc_put(dip);
624 return error;
625 }
626
627 int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
628 void *fs_info)
629 {
630 const struct xattr *xattr;
631 int err = 0;
632
633 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
634 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
635 xattr->value_len, 0,
636 GFS2_EATYPE_SECURITY);
637 if (err < 0)
638 break;
639 }
640 return err;
641 }
642
643 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
644 const struct qstr *qstr)
645 {
646 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
647 &gfs2_initxattrs, NULL);
648 }
649
650 /**
651 * gfs2_create_inode - Create a new inode
652 * @dir: The parent directory
653 * @dentry: The new dentry
654 * @mode: The permissions on the new inode
655 * @dev: For device nodes, this is the device number
656 * @symname: For symlinks, this is the link destination
657 * @size: The initial size of the inode (ignored for directories)
658 *
659 * Returns: 0 on success, or error code
660 */
661
662 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
663 unsigned int mode, dev_t dev, const char *symname,
664 unsigned int size)
665 {
666 const struct qstr *name = &dentry->d_name;
667 struct gfs2_holder ghs[2];
668 struct inode *inode = NULL;
669 struct gfs2_inode *dip = GFS2_I(dir);
670 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
671 struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
672 int error;
673 u64 generation;
674 struct buffer_head *bh = NULL;
675
676 if (!name->len || name->len > GFS2_FNAMESIZE)
677 return -ENAMETOOLONG;
678
679 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
680 if (error)
681 goto fail;
682
683 error = create_ok(dip, name, mode);
684 if (error)
685 goto fail_gunlock;
686
687 error = alloc_dinode(dip, &inum.no_addr, &generation);
688 if (error)
689 goto fail_gunlock;
690 inum.no_formal_ino = generation;
691
692 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
693 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
694 if (error)
695 goto fail_gunlock;
696
697 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, symname, size, &bh);
698 if (error)
699 goto fail_gunlock2;
700
701 inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr,
702 inum.no_formal_ino, 0);
703 if (IS_ERR(inode))
704 goto fail_gunlock2;
705
706 error = gfs2_inode_refresh(GFS2_I(inode));
707 if (error)
708 goto fail_gunlock2;
709
710 error = gfs2_acl_create(dip, inode);
711 if (error)
712 goto fail_gunlock2;
713
714 error = gfs2_security_init(dip, GFS2_I(inode), name);
715 if (error)
716 goto fail_gunlock2;
717
718 error = link_dinode(dip, name, GFS2_I(inode));
719 if (error)
720 goto fail_gunlock2;
721
722 if (bh)
723 brelse(bh);
724
725 gfs2_trans_end(sdp);
726 if (dip->i_alloc->al_rgd)
727 gfs2_inplace_release(dip);
728 gfs2_quota_unlock(dip);
729 gfs2_alloc_put(dip);
730 gfs2_glock_dq_uninit_m(2, ghs);
731 mark_inode_dirty(inode);
732 d_instantiate(dentry, inode);
733 return 0;
734
735 fail_gunlock2:
736 gfs2_glock_dq_uninit(ghs + 1);
737 if (inode && !IS_ERR(inode))
738 iput(inode);
739 fail_gunlock:
740 gfs2_glock_dq_uninit(ghs);
741 fail:
742 if (bh)
743 brelse(bh);
744 return error;
745 }
746
747 /**
748 * gfs2_create - Create a file
749 * @dir: The directory in which to create the file
750 * @dentry: The dentry of the new file
751 * @mode: The mode of the new file
752 *
753 * Returns: errno
754 */
755
756 static int gfs2_create(struct inode *dir, struct dentry *dentry,
757 int mode, struct nameidata *nd)
758 {
759 struct inode *inode;
760 int ret;
761
762 for (;;) {
763 ret = gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0);
764 if (ret != -EEXIST || (nd && (nd->flags & LOOKUP_EXCL)))
765 return ret;
766
767 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
768 if (inode) {
769 if (!IS_ERR(inode))
770 break;
771 return PTR_ERR(inode);
772 }
773 }
774
775 d_instantiate(dentry, inode);
776 return 0;
777 }
778
779 /**
780 * gfs2_lookup - Look up a filename in a directory and return its inode
781 * @dir: The directory inode
782 * @dentry: The dentry of the new inode
783 * @nd: passed from Linux VFS, ignored by us
784 *
785 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
786 *
787 * Returns: errno
788 */
789
790 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
791 struct nameidata *nd)
792 {
793 struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0);
794 if (inode && !IS_ERR(inode)) {
795 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
796 struct gfs2_holder gh;
797 int error;
798 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
799 if (error) {
800 iput(inode);
801 return ERR_PTR(error);
802 }
803 gfs2_glock_dq_uninit(&gh);
804 }
805 return d_splice_alias(inode, dentry);
806 }
807
808 /**
809 * gfs2_link - Link to a file
810 * @old_dentry: The inode to link
811 * @dir: Add link to this directory
812 * @dentry: The name of the link
813 *
814 * Link the inode in "old_dentry" into the directory "dir" with the
815 * name in "dentry".
816 *
817 * Returns: errno
818 */
819
820 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
821 struct dentry *dentry)
822 {
823 struct gfs2_inode *dip = GFS2_I(dir);
824 struct gfs2_sbd *sdp = GFS2_SB(dir);
825 struct inode *inode = old_dentry->d_inode;
826 struct gfs2_inode *ip = GFS2_I(inode);
827 struct gfs2_holder ghs[2];
828 struct buffer_head *dibh;
829 int alloc_required;
830 int error;
831
832 if (S_ISDIR(inode->i_mode))
833 return -EPERM;
834
835 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
836 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
837
838 error = gfs2_glock_nq(ghs); /* parent */
839 if (error)
840 goto out_parent;
841
842 error = gfs2_glock_nq(ghs + 1); /* child */
843 if (error)
844 goto out_child;
845
846 error = -ENOENT;
847 if (inode->i_nlink == 0)
848 goto out_gunlock;
849
850 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
851 if (error)
852 goto out_gunlock;
853
854 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
855 switch (error) {
856 case -ENOENT:
857 break;
858 case 0:
859 error = -EEXIST;
860 default:
861 goto out_gunlock;
862 }
863
864 error = -EINVAL;
865 if (!dip->i_inode.i_nlink)
866 goto out_gunlock;
867 error = -EFBIG;
868 if (dip->i_entries == (u32)-1)
869 goto out_gunlock;
870 error = -EPERM;
871 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
872 goto out_gunlock;
873 error = -EINVAL;
874 if (!ip->i_inode.i_nlink)
875 goto out_gunlock;
876 error = -EMLINK;
877 if (ip->i_inode.i_nlink == (u32)-1)
878 goto out_gunlock;
879
880 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
881 if (error < 0)
882 goto out_gunlock;
883 error = 0;
884
885 if (alloc_required) {
886 struct gfs2_alloc *al = gfs2_alloc_get(dip);
887 if (!al) {
888 error = -ENOMEM;
889 goto out_gunlock;
890 }
891
892 error = gfs2_quota_lock_check(dip);
893 if (error)
894 goto out_alloc;
895
896 al->al_requested = sdp->sd_max_dirres;
897
898 error = gfs2_inplace_reserve(dip);
899 if (error)
900 goto out_gunlock_q;
901
902 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
903 gfs2_rg_blocks(al) +
904 2 * RES_DINODE + RES_STATFS +
905 RES_QUOTA, 0);
906 if (error)
907 goto out_ipres;
908 } else {
909 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
910 if (error)
911 goto out_ipres;
912 }
913
914 error = gfs2_meta_inode_buffer(ip, &dibh);
915 if (error)
916 goto out_end_trans;
917
918 error = gfs2_dir_add(dir, &dentry->d_name, ip);
919 if (error)
920 goto out_brelse;
921
922 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
923 inc_nlink(&ip->i_inode);
924 ip->i_inode.i_ctime = CURRENT_TIME;
925 gfs2_dinode_out(ip, dibh->b_data);
926 mark_inode_dirty(&ip->i_inode);
927
928 out_brelse:
929 brelse(dibh);
930 out_end_trans:
931 gfs2_trans_end(sdp);
932 out_ipres:
933 if (alloc_required)
934 gfs2_inplace_release(dip);
935 out_gunlock_q:
936 if (alloc_required)
937 gfs2_quota_unlock(dip);
938 out_alloc:
939 if (alloc_required)
940 gfs2_alloc_put(dip);
941 out_gunlock:
942 gfs2_glock_dq(ghs + 1);
943 out_child:
944 gfs2_glock_dq(ghs);
945 out_parent:
946 gfs2_holder_uninit(ghs);
947 gfs2_holder_uninit(ghs + 1);
948 if (!error) {
949 ihold(inode);
950 d_instantiate(dentry, inode);
951 mark_inode_dirty(inode);
952 }
953 return error;
954 }
955
956 /*
957 * gfs2_unlink_ok - check to see that a inode is still in a directory
958 * @dip: the directory
959 * @name: the name of the file
960 * @ip: the inode
961 *
962 * Assumes that the lock on (at least) @dip is held.
963 *
964 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
965 */
966
967 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
968 const struct gfs2_inode *ip)
969 {
970 int error;
971
972 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
973 return -EPERM;
974
975 if ((dip->i_inode.i_mode & S_ISVTX) &&
976 dip->i_inode.i_uid != current_fsuid() &&
977 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
978 return -EPERM;
979
980 if (IS_APPEND(&dip->i_inode))
981 return -EPERM;
982
983 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
984 if (error)
985 return error;
986
987 error = gfs2_dir_check(&dip->i_inode, name, ip);
988 if (error)
989 return error;
990
991 return 0;
992 }
993
994 /**
995 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
996 * @dip: The parent directory
997 * @name: The name of the entry in the parent directory
998 * @bh: The inode buffer for the inode to be removed
999 * @inode: The inode to be removed
1000 *
1001 * Called with all the locks and in a transaction. This will only be
1002 * called for a directory after it has been checked to ensure it is empty.
1003 *
1004 * Returns: 0 on success, or an error
1005 */
1006
1007 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1008 const struct dentry *dentry,
1009 struct buffer_head *bh)
1010 {
1011 struct inode *inode = dentry->d_inode;
1012 struct gfs2_inode *ip = GFS2_I(inode);
1013 int error;
1014
1015 error = gfs2_dir_del(dip, dentry);
1016 if (error)
1017 return error;
1018
1019 ip->i_entries = 0;
1020 inode->i_ctime = CURRENT_TIME;
1021 if (S_ISDIR(inode->i_mode))
1022 clear_nlink(inode);
1023 else
1024 drop_nlink(inode);
1025 gfs2_trans_add_bh(ip->i_gl, bh, 1);
1026 gfs2_dinode_out(ip, bh->b_data);
1027 mark_inode_dirty(inode);
1028 if (inode->i_nlink == 0)
1029 gfs2_unlink_di(inode);
1030 return 0;
1031 }
1032
1033
1034 /**
1035 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1036 * @dir: The inode of the directory containing the inode to unlink
1037 * @dentry: The file itself
1038 *
1039 * This routine uses the type of the inode as a flag to figure out
1040 * whether this is an unlink or an rmdir.
1041 *
1042 * Returns: errno
1043 */
1044
1045 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1046 {
1047 struct gfs2_inode *dip = GFS2_I(dir);
1048 struct gfs2_sbd *sdp = GFS2_SB(dir);
1049 struct inode *inode = dentry->d_inode;
1050 struct gfs2_inode *ip = GFS2_I(inode);
1051 struct buffer_head *bh;
1052 struct gfs2_holder ghs[3];
1053 struct gfs2_rgrpd *rgd;
1054 struct gfs2_holder ri_gh;
1055 int error;
1056
1057 error = gfs2_rindex_hold(sdp, &ri_gh);
1058 if (error)
1059 return error;
1060
1061 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1062 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1063
1064 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
1065 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1066
1067
1068 error = gfs2_glock_nq(ghs); /* parent */
1069 if (error)
1070 goto out_parent;
1071
1072 error = gfs2_glock_nq(ghs + 1); /* child */
1073 if (error)
1074 goto out_child;
1075
1076 error = -ENOENT;
1077 if (inode->i_nlink == 0)
1078 goto out_rgrp;
1079
1080 if (S_ISDIR(inode->i_mode)) {
1081 error = -ENOTEMPTY;
1082 if (ip->i_entries > 2 || inode->i_nlink > 2)
1083 goto out_rgrp;
1084 }
1085
1086 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1087 if (error)
1088 goto out_rgrp;
1089
1090 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1091 if (error)
1092 goto out_gunlock;
1093
1094 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1095 if (error)
1096 goto out_gunlock;
1097
1098 error = gfs2_meta_inode_buffer(ip, &bh);
1099 if (error)
1100 goto out_end_trans;
1101
1102 error = gfs2_unlink_inode(dip, dentry, bh);
1103 brelse(bh);
1104
1105 out_end_trans:
1106 gfs2_trans_end(sdp);
1107 out_gunlock:
1108 gfs2_glock_dq(ghs + 2);
1109 out_rgrp:
1110 gfs2_holder_uninit(ghs + 2);
1111 gfs2_glock_dq(ghs + 1);
1112 out_child:
1113 gfs2_holder_uninit(ghs + 1);
1114 gfs2_glock_dq(ghs);
1115 out_parent:
1116 gfs2_holder_uninit(ghs);
1117 gfs2_glock_dq_uninit(&ri_gh);
1118 return error;
1119 }
1120
1121 /**
1122 * gfs2_symlink - Create a symlink
1123 * @dir: The directory to create the symlink in
1124 * @dentry: The dentry to put the symlink in
1125 * @symname: The thing which the link points to
1126 *
1127 * Returns: errno
1128 */
1129
1130 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1131 const char *symname)
1132 {
1133 struct gfs2_sbd *sdp = GFS2_SB(dir);
1134 unsigned int size;
1135
1136 size = strlen(symname);
1137 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1138 return -ENAMETOOLONG;
1139
1140 return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size);
1141 }
1142
1143 /**
1144 * gfs2_mkdir - Make a directory
1145 * @dir: The parent directory of the new one
1146 * @dentry: The dentry of the new directory
1147 * @mode: The mode of the new directory
1148 *
1149 * Returns: errno
1150 */
1151
1152 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1153 {
1154 return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 0);
1155 }
1156
1157 /**
1158 * gfs2_mknod - Make a special file
1159 * @dir: The directory in which the special file will reside
1160 * @dentry: The dentry of the special file
1161 * @mode: The mode of the special file
1162 * @dev: The device specification of the special file
1163 *
1164 */
1165
1166 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
1167 dev_t dev)
1168 {
1169 return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0);
1170 }
1171
1172 /*
1173 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1174 * @this: move this
1175 * @to: to here
1176 *
1177 * Follow @to back to the root and make sure we don't encounter @this
1178 * Assumes we already hold the rename lock.
1179 *
1180 * Returns: errno
1181 */
1182
1183 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1184 {
1185 struct inode *dir = &to->i_inode;
1186 struct super_block *sb = dir->i_sb;
1187 struct inode *tmp;
1188 int error = 0;
1189
1190 igrab(dir);
1191
1192 for (;;) {
1193 if (dir == &this->i_inode) {
1194 error = -EINVAL;
1195 break;
1196 }
1197 if (dir == sb->s_root->d_inode) {
1198 error = 0;
1199 break;
1200 }
1201
1202 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1203 if (IS_ERR(tmp)) {
1204 error = PTR_ERR(tmp);
1205 break;
1206 }
1207
1208 iput(dir);
1209 dir = tmp;
1210 }
1211
1212 iput(dir);
1213
1214 return error;
1215 }
1216
1217 /**
1218 * gfs2_rename - Rename a file
1219 * @odir: Parent directory of old file name
1220 * @odentry: The old dentry of the file
1221 * @ndir: Parent directory of new file name
1222 * @ndentry: The new dentry of the file
1223 *
1224 * Returns: errno
1225 */
1226
1227 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1228 struct inode *ndir, struct dentry *ndentry)
1229 {
1230 struct gfs2_inode *odip = GFS2_I(odir);
1231 struct gfs2_inode *ndip = GFS2_I(ndir);
1232 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1233 struct gfs2_inode *nip = NULL;
1234 struct gfs2_sbd *sdp = GFS2_SB(odir);
1235 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }, ri_gh;
1236 struct gfs2_rgrpd *nrgd;
1237 unsigned int num_gh;
1238 int dir_rename = 0;
1239 int alloc_required = 0;
1240 unsigned int x;
1241 int error;
1242
1243 if (ndentry->d_inode) {
1244 nip = GFS2_I(ndentry->d_inode);
1245 if (ip == nip)
1246 return 0;
1247 }
1248
1249 error = gfs2_rindex_hold(sdp, &ri_gh);
1250 if (error)
1251 return error;
1252
1253 if (odip != ndip) {
1254 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1255 0, &r_gh);
1256 if (error)
1257 goto out;
1258
1259 if (S_ISDIR(ip->i_inode.i_mode)) {
1260 dir_rename = 1;
1261 /* don't move a dirctory into it's subdir */
1262 error = gfs2_ok_to_move(ip, ndip);
1263 if (error)
1264 goto out_gunlock_r;
1265 }
1266 }
1267
1268 num_gh = 1;
1269 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1270 if (odip != ndip) {
1271 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1272 num_gh++;
1273 }
1274 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1275 num_gh++;
1276
1277 if (nip) {
1278 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1279 num_gh++;
1280 /* grab the resource lock for unlink flag twiddling
1281 * this is the case of the target file already existing
1282 * so we unlink before doing the rename
1283 */
1284 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
1285 if (nrgd)
1286 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1287 }
1288
1289 for (x = 0; x < num_gh; x++) {
1290 error = gfs2_glock_nq(ghs + x);
1291 if (error)
1292 goto out_gunlock;
1293 }
1294
1295 error = -ENOENT;
1296 if (ip->i_inode.i_nlink == 0)
1297 goto out_gunlock;
1298
1299 /* Check out the old directory */
1300
1301 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1302 if (error)
1303 goto out_gunlock;
1304
1305 /* Check out the new directory */
1306
1307 if (nip) {
1308 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1309 if (error)
1310 goto out_gunlock;
1311
1312 if (nip->i_inode.i_nlink == 0) {
1313 error = -EAGAIN;
1314 goto out_gunlock;
1315 }
1316
1317 if (S_ISDIR(nip->i_inode.i_mode)) {
1318 if (nip->i_entries < 2) {
1319 gfs2_consist_inode(nip);
1320 error = -EIO;
1321 goto out_gunlock;
1322 }
1323 if (nip->i_entries > 2) {
1324 error = -ENOTEMPTY;
1325 goto out_gunlock;
1326 }
1327 }
1328 } else {
1329 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1330 if (error)
1331 goto out_gunlock;
1332
1333 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1334 switch (error) {
1335 case -ENOENT:
1336 error = 0;
1337 break;
1338 case 0:
1339 error = -EEXIST;
1340 default:
1341 goto out_gunlock;
1342 };
1343
1344 if (odip != ndip) {
1345 if (!ndip->i_inode.i_nlink) {
1346 error = -ENOENT;
1347 goto out_gunlock;
1348 }
1349 if (ndip->i_entries == (u32)-1) {
1350 error = -EFBIG;
1351 goto out_gunlock;
1352 }
1353 if (S_ISDIR(ip->i_inode.i_mode) &&
1354 ndip->i_inode.i_nlink == (u32)-1) {
1355 error = -EMLINK;
1356 goto out_gunlock;
1357 }
1358 }
1359 }
1360
1361 /* Check out the dir to be renamed */
1362
1363 if (dir_rename) {
1364 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1365 if (error)
1366 goto out_gunlock;
1367 }
1368
1369 if (nip == NULL)
1370 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1371 error = alloc_required;
1372 if (error < 0)
1373 goto out_gunlock;
1374 error = 0;
1375
1376 if (alloc_required) {
1377 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
1378 if (!al) {
1379 error = -ENOMEM;
1380 goto out_gunlock;
1381 }
1382
1383 error = gfs2_quota_lock_check(ndip);
1384 if (error)
1385 goto out_alloc;
1386
1387 al->al_requested = sdp->sd_max_dirres;
1388
1389 error = gfs2_inplace_reserve_ri(ndip);
1390 if (error)
1391 goto out_gunlock_q;
1392
1393 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1394 gfs2_rg_blocks(al) +
1395 4 * RES_DINODE + 4 * RES_LEAF +
1396 RES_STATFS + RES_QUOTA + 4, 0);
1397 if (error)
1398 goto out_ipreserv;
1399 } else {
1400 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1401 5 * RES_LEAF + 4, 0);
1402 if (error)
1403 goto out_gunlock;
1404 }
1405
1406 /* Remove the target file, if it exists */
1407
1408 if (nip) {
1409 struct buffer_head *bh;
1410 error = gfs2_meta_inode_buffer(nip, &bh);
1411 if (error)
1412 goto out_end_trans;
1413 error = gfs2_unlink_inode(ndip, ndentry, bh);
1414 brelse(bh);
1415 }
1416
1417 if (dir_rename) {
1418 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1419 if (error)
1420 goto out_end_trans;
1421 } else {
1422 struct buffer_head *dibh;
1423 error = gfs2_meta_inode_buffer(ip, &dibh);
1424 if (error)
1425 goto out_end_trans;
1426 ip->i_inode.i_ctime = CURRENT_TIME;
1427 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1428 gfs2_dinode_out(ip, dibh->b_data);
1429 brelse(dibh);
1430 }
1431
1432 error = gfs2_dir_del(odip, odentry);
1433 if (error)
1434 goto out_end_trans;
1435
1436 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1437 if (error)
1438 goto out_end_trans;
1439
1440 out_end_trans:
1441 gfs2_trans_end(sdp);
1442 out_ipreserv:
1443 if (alloc_required)
1444 gfs2_inplace_release(ndip);
1445 out_gunlock_q:
1446 if (alloc_required)
1447 gfs2_quota_unlock(ndip);
1448 out_alloc:
1449 if (alloc_required)
1450 gfs2_alloc_put(ndip);
1451 out_gunlock:
1452 while (x--) {
1453 gfs2_glock_dq(ghs + x);
1454 gfs2_holder_uninit(ghs + x);
1455 }
1456 out_gunlock_r:
1457 if (r_gh.gh_gl)
1458 gfs2_glock_dq_uninit(&r_gh);
1459 out:
1460 gfs2_glock_dq_uninit(&ri_gh);
1461 return error;
1462 }
1463
1464 /**
1465 * gfs2_follow_link - Follow a symbolic link
1466 * @dentry: The dentry of the link
1467 * @nd: Data that we pass to vfs_follow_link()
1468 *
1469 * This can handle symlinks of any size.
1470 *
1471 * Returns: 0 on success or error code
1472 */
1473
1474 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1475 {
1476 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1477 struct gfs2_holder i_gh;
1478 struct buffer_head *dibh;
1479 unsigned int size;
1480 char *buf;
1481 int error;
1482
1483 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1484 error = gfs2_glock_nq(&i_gh);
1485 if (error) {
1486 gfs2_holder_uninit(&i_gh);
1487 nd_set_link(nd, ERR_PTR(error));
1488 return NULL;
1489 }
1490
1491 size = (unsigned int)i_size_read(&ip->i_inode);
1492 if (size == 0) {
1493 gfs2_consist_inode(ip);
1494 buf = ERR_PTR(-EIO);
1495 goto out;
1496 }
1497
1498 error = gfs2_meta_inode_buffer(ip, &dibh);
1499 if (error) {
1500 buf = ERR_PTR(error);
1501 goto out;
1502 }
1503
1504 buf = kzalloc(size + 1, GFP_NOFS);
1505 if (!buf)
1506 buf = ERR_PTR(-ENOMEM);
1507 else
1508 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1509 brelse(dibh);
1510 out:
1511 gfs2_glock_dq_uninit(&i_gh);
1512 nd_set_link(nd, buf);
1513 return NULL;
1514 }
1515
1516 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1517 {
1518 char *s = nd_get_link(nd);
1519 if (!IS_ERR(s))
1520 kfree(s);
1521 }
1522
1523 /**
1524 * gfs2_permission -
1525 * @inode: The inode
1526 * @mask: The mask to be tested
1527 * @flags: Indicates whether this is an RCU path walk or not
1528 *
1529 * This may be called from the VFS directly, or from within GFS2 with the
1530 * inode locked, so we look to see if the glock is already locked and only
1531 * lock the glock if its not already been done.
1532 *
1533 * Returns: errno
1534 */
1535
1536 int gfs2_permission(struct inode *inode, int mask)
1537 {
1538 struct gfs2_inode *ip;
1539 struct gfs2_holder i_gh;
1540 int error;
1541 int unlock = 0;
1542
1543
1544 ip = GFS2_I(inode);
1545 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1546 if (mask & MAY_NOT_BLOCK)
1547 return -ECHILD;
1548 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1549 if (error)
1550 return error;
1551 unlock = 1;
1552 }
1553
1554 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1555 error = -EACCES;
1556 else
1557 error = generic_permission(inode, mask);
1558 if (unlock)
1559 gfs2_glock_dq_uninit(&i_gh);
1560
1561 return error;
1562 }
1563
1564 static int __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1565 {
1566 struct inode *inode = &ip->i_inode;
1567 struct buffer_head *dibh;
1568 int error;
1569
1570 error = gfs2_meta_inode_buffer(ip, &dibh);
1571 if (error)
1572 return error;
1573
1574 setattr_copy(inode, attr);
1575 mark_inode_dirty(inode);
1576 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1577 gfs2_dinode_out(ip, dibh->b_data);
1578 brelse(dibh);
1579 return 0;
1580 }
1581
1582 /**
1583 * gfs2_setattr_simple -
1584 * @ip:
1585 * @attr:
1586 *
1587 * Returns: errno
1588 */
1589
1590 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1591 {
1592 int error;
1593
1594 if (current->journal_info)
1595 return __gfs2_setattr_simple(ip, attr);
1596
1597 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1598 if (error)
1599 return error;
1600
1601 error = __gfs2_setattr_simple(ip, attr);
1602 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1603 return error;
1604 }
1605
1606 static int setattr_chown(struct inode *inode, struct iattr *attr)
1607 {
1608 struct gfs2_inode *ip = GFS2_I(inode);
1609 struct gfs2_sbd *sdp = GFS2_SB(inode);
1610 u32 ouid, ogid, nuid, ngid;
1611 int error;
1612
1613 ouid = inode->i_uid;
1614 ogid = inode->i_gid;
1615 nuid = attr->ia_uid;
1616 ngid = attr->ia_gid;
1617
1618 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1619 ouid = nuid = NO_QUOTA_CHANGE;
1620 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1621 ogid = ngid = NO_QUOTA_CHANGE;
1622
1623 if (!gfs2_alloc_get(ip))
1624 return -ENOMEM;
1625
1626 error = gfs2_quota_lock(ip, nuid, ngid);
1627 if (error)
1628 goto out_alloc;
1629
1630 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1631 error = gfs2_quota_check(ip, nuid, ngid);
1632 if (error)
1633 goto out_gunlock_q;
1634 }
1635
1636 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1637 if (error)
1638 goto out_gunlock_q;
1639
1640 error = gfs2_setattr_simple(ip, attr);
1641 if (error)
1642 goto out_end_trans;
1643
1644 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1645 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1646 gfs2_quota_change(ip, -blocks, ouid, ogid);
1647 gfs2_quota_change(ip, blocks, nuid, ngid);
1648 }
1649
1650 out_end_trans:
1651 gfs2_trans_end(sdp);
1652 out_gunlock_q:
1653 gfs2_quota_unlock(ip);
1654 out_alloc:
1655 gfs2_alloc_put(ip);
1656 return error;
1657 }
1658
1659 /**
1660 * gfs2_setattr - Change attributes on an inode
1661 * @dentry: The dentry which is changing
1662 * @attr: The structure describing the change
1663 *
1664 * The VFS layer wants to change one or more of an inodes attributes. Write
1665 * that change out to disk.
1666 *
1667 * Returns: errno
1668 */
1669
1670 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1671 {
1672 struct inode *inode = dentry->d_inode;
1673 struct gfs2_inode *ip = GFS2_I(inode);
1674 struct gfs2_holder i_gh;
1675 int error;
1676
1677 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1678 if (error)
1679 return error;
1680
1681 error = -EPERM;
1682 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1683 goto out;
1684
1685 error = inode_change_ok(inode, attr);
1686 if (error)
1687 goto out;
1688
1689 if (attr->ia_valid & ATTR_SIZE)
1690 error = gfs2_setattr_size(inode, attr->ia_size);
1691 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1692 error = setattr_chown(inode, attr);
1693 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1694 error = gfs2_acl_chmod(ip, attr);
1695 else
1696 error = gfs2_setattr_simple(ip, attr);
1697
1698 out:
1699 gfs2_glock_dq_uninit(&i_gh);
1700 if (!error)
1701 mark_inode_dirty(inode);
1702 return error;
1703 }
1704
1705 /**
1706 * gfs2_getattr - Read out an inode's attributes
1707 * @mnt: The vfsmount the inode is being accessed from
1708 * @dentry: The dentry to stat
1709 * @stat: The inode's stats
1710 *
1711 * This may be called from the VFS directly, or from within GFS2 with the
1712 * inode locked, so we look to see if the glock is already locked and only
1713 * lock the glock if its not already been done. Note that its the NFS
1714 * readdirplus operation which causes this to be called (from filldir)
1715 * with the glock already held.
1716 *
1717 * Returns: errno
1718 */
1719
1720 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1721 struct kstat *stat)
1722 {
1723 struct inode *inode = dentry->d_inode;
1724 struct gfs2_inode *ip = GFS2_I(inode);
1725 struct gfs2_holder gh;
1726 int error;
1727 int unlock = 0;
1728
1729 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1730 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1731 if (error)
1732 return error;
1733 unlock = 1;
1734 }
1735
1736 generic_fillattr(inode, stat);
1737 if (unlock)
1738 gfs2_glock_dq_uninit(&gh);
1739
1740 return 0;
1741 }
1742
1743 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1744 const void *data, size_t size, int flags)
1745 {
1746 struct inode *inode = dentry->d_inode;
1747 struct gfs2_inode *ip = GFS2_I(inode);
1748 struct gfs2_holder gh;
1749 int ret;
1750
1751 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1752 ret = gfs2_glock_nq(&gh);
1753 if (ret == 0) {
1754 ret = generic_setxattr(dentry, name, data, size, flags);
1755 gfs2_glock_dq(&gh);
1756 }
1757 gfs2_holder_uninit(&gh);
1758 return ret;
1759 }
1760
1761 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1762 void *data, size_t size)
1763 {
1764 struct inode *inode = dentry->d_inode;
1765 struct gfs2_inode *ip = GFS2_I(inode);
1766 struct gfs2_holder gh;
1767 int ret;
1768
1769 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1770 ret = gfs2_glock_nq(&gh);
1771 if (ret == 0) {
1772 ret = generic_getxattr(dentry, name, data, size);
1773 gfs2_glock_dq(&gh);
1774 }
1775 gfs2_holder_uninit(&gh);
1776 return ret;
1777 }
1778
1779 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1780 {
1781 struct inode *inode = dentry->d_inode;
1782 struct gfs2_inode *ip = GFS2_I(inode);
1783 struct gfs2_holder gh;
1784 int ret;
1785
1786 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1787 ret = gfs2_glock_nq(&gh);
1788 if (ret == 0) {
1789 ret = generic_removexattr(dentry, name);
1790 gfs2_glock_dq(&gh);
1791 }
1792 gfs2_holder_uninit(&gh);
1793 return ret;
1794 }
1795
1796 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1797 u64 start, u64 len)
1798 {
1799 struct gfs2_inode *ip = GFS2_I(inode);
1800 struct gfs2_holder gh;
1801 int ret;
1802
1803 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1804 if (ret)
1805 return ret;
1806
1807 mutex_lock(&inode->i_mutex);
1808
1809 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1810 if (ret)
1811 goto out;
1812
1813 if (gfs2_is_stuffed(ip)) {
1814 u64 phys = ip->i_no_addr << inode->i_blkbits;
1815 u64 size = i_size_read(inode);
1816 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1817 FIEMAP_EXTENT_DATA_INLINE;
1818 phys += sizeof(struct gfs2_dinode);
1819 phys += start;
1820 if (start + len > size)
1821 len = size - start;
1822 if (start < size)
1823 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1824 len, flags);
1825 if (ret == 1)
1826 ret = 0;
1827 } else {
1828 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1829 gfs2_block_map);
1830 }
1831
1832 gfs2_glock_dq_uninit(&gh);
1833 out:
1834 mutex_unlock(&inode->i_mutex);
1835 return ret;
1836 }
1837
1838 const struct inode_operations gfs2_file_iops = {
1839 .permission = gfs2_permission,
1840 .setattr = gfs2_setattr,
1841 .getattr = gfs2_getattr,
1842 .setxattr = gfs2_setxattr,
1843 .getxattr = gfs2_getxattr,
1844 .listxattr = gfs2_listxattr,
1845 .removexattr = gfs2_removexattr,
1846 .fiemap = gfs2_fiemap,
1847 .get_acl = gfs2_get_acl,
1848 };
1849
1850 const struct inode_operations gfs2_dir_iops = {
1851 .create = gfs2_create,
1852 .lookup = gfs2_lookup,
1853 .link = gfs2_link,
1854 .unlink = gfs2_unlink,
1855 .symlink = gfs2_symlink,
1856 .mkdir = gfs2_mkdir,
1857 .rmdir = gfs2_unlink,
1858 .mknod = gfs2_mknod,
1859 .rename = gfs2_rename,
1860 .permission = gfs2_permission,
1861 .setattr = gfs2_setattr,
1862 .getattr = gfs2_getattr,
1863 .setxattr = gfs2_setxattr,
1864 .getxattr = gfs2_getxattr,
1865 .listxattr = gfs2_listxattr,
1866 .removexattr = gfs2_removexattr,
1867 .fiemap = gfs2_fiemap,
1868 .get_acl = gfs2_get_acl,
1869 };
1870
1871 const struct inode_operations gfs2_symlink_iops = {
1872 .readlink = generic_readlink,
1873 .follow_link = gfs2_follow_link,
1874 .put_link = gfs2_put_link,
1875 .permission = gfs2_permission,
1876 .setattr = gfs2_setattr,
1877 .getattr = gfs2_getattr,
1878 .setxattr = gfs2_setxattr,
1879 .getxattr = gfs2_getxattr,
1880 .listxattr = gfs2_listxattr,
1881 .removexattr = gfs2_removexattr,
1882 .fiemap = gfs2_fiemap,
1883 .get_acl = gfs2_get_acl,
1884 };
1885
Linux Btrfs Development