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kvm tools, setup: Create private directory
[linux-2.6/next.git] / fs / gfs2 / inode.c
blob03e0c529063e45042985fef09518ecd52b7be085
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, 0);
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, 0);
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 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
628 const struct qstr *qstr)
629 {
630 int err;
631 size_t len;
632 void *value;
633 char *name;
634
635 err = security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
636 &name, &value, &len);
637
638 if (err) {
639 if (err == -EOPNOTSUPP)
640 return 0;
641 return err;
642 }
643
644 err = __gfs2_xattr_set(&ip->i_inode, name, value, len, 0,
645 GFS2_EATYPE_SECURITY);
646 kfree(value);
647 kfree(name);
648
649 return err;
650 }
651
652 /**
653 * gfs2_create_inode - Create a new inode
654 * @dir: The parent directory
655 * @dentry: The new dentry
656 * @mode: The permissions on the new inode
657 * @dev: For device nodes, this is the device number
658 * @symname: For symlinks, this is the link destination
659 * @size: The initial size of the inode (ignored for directories)
660 *
661 * Returns: 0 on success, or error code
662 */
663
664 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
665 unsigned int mode, dev_t dev, const char *symname,
666 unsigned int size)
667 {
668 const struct qstr *name = &dentry->d_name;
669 struct gfs2_holder ghs[2];
670 struct inode *inode = NULL;
671 struct gfs2_inode *dip = GFS2_I(dir);
672 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
673 struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
674 int error;
675 u64 generation;
676 struct buffer_head *bh = NULL;
677
678 if (!name->len || name->len > GFS2_FNAMESIZE)
679 return -ENAMETOOLONG;
680
681 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
682 if (error)
683 goto fail;
684
685 error = create_ok(dip, name, mode);
686 if (error)
687 goto fail_gunlock;
688
689 error = alloc_dinode(dip, &inum.no_addr, &generation);
690 if (error)
691 goto fail_gunlock;
692 inum.no_formal_ino = generation;
693
694 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
695 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
696 if (error)
697 goto fail_gunlock;
698
699 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, symname, size, &bh);
700 if (error)
701 goto fail_gunlock2;
702
703 inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr,
704 inum.no_formal_ino, 0);
705 if (IS_ERR(inode))
706 goto fail_gunlock2;
707
708 error = gfs2_inode_refresh(GFS2_I(inode));
709 if (error)
710 goto fail_gunlock2;
711
712 error = gfs2_acl_create(dip, inode);
713 if (error)
714 goto fail_gunlock2;
715
716 error = gfs2_security_init(dip, GFS2_I(inode), name);
717 if (error)
718 goto fail_gunlock2;
719
720 error = link_dinode(dip, name, GFS2_I(inode));
721 if (error)
722 goto fail_gunlock2;
723
724 if (bh)
725 brelse(bh);
726
727 gfs2_trans_end(sdp);
728 if (dip->i_alloc->al_rgd)
729 gfs2_inplace_release(dip);
730 gfs2_quota_unlock(dip);
731 gfs2_alloc_put(dip);
732 gfs2_glock_dq_uninit_m(2, ghs);
733 mark_inode_dirty(inode);
734 d_instantiate(dentry, inode);
735 return 0;
736
737 fail_gunlock2:
738 gfs2_glock_dq_uninit(ghs + 1);
739 if (inode && !IS_ERR(inode))
740 iput(inode);
741 fail_gunlock:
742 gfs2_glock_dq_uninit(ghs);
743 fail:
744 if (bh)
745 brelse(bh);
746 return error;
747 }
748
749 /**
750 * gfs2_create - Create a file
751 * @dir: The directory in which to create the file
752 * @dentry: The dentry of the new file
753 * @mode: The mode of the new file
754 *
755 * Returns: errno
756 */
757
758 static int gfs2_create(struct inode *dir, struct dentry *dentry,
759 int mode, struct nameidata *nd)
760 {
761 struct inode *inode;
762 int ret;
763
764 for (;;) {
765 ret = gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0);
766 if (ret != -EEXIST || (nd && (nd->flags & LOOKUP_EXCL)))
767 return ret;
768
769 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
770 if (inode) {
771 if (!IS_ERR(inode))
772 break;
773 return PTR_ERR(inode);
774 }
775 }
776
777 d_instantiate(dentry, inode);
778 return 0;
779 }
780
781 /**
782 * gfs2_lookup - Look up a filename in a directory and return its inode
783 * @dir: The directory inode
784 * @dentry: The dentry of the new inode
785 * @nd: passed from Linux VFS, ignored by us
786 *
787 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
788 *
789 * Returns: errno
790 */
791
792 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
793 struct nameidata *nd)
794 {
795 struct inode *inode = NULL;
796
797 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
798 if (inode && IS_ERR(inode))
799 return ERR_CAST(inode);
800
801 if (inode) {
802 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
803 struct gfs2_holder gh;
804 int error;
805 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
806 if (error) {
807 iput(inode);
808 return ERR_PTR(error);
809 }
810 gfs2_glock_dq_uninit(&gh);
811 return d_splice_alias(inode, dentry);
812 }
813 d_add(dentry, inode);
814
815 return NULL;
816 }
817
818 /**
819 * gfs2_link - Link to a file
820 * @old_dentry: The inode to link
821 * @dir: Add link to this directory
822 * @dentry: The name of the link
823 *
824 * Link the inode in "old_dentry" into the directory "dir" with the
825 * name in "dentry".
826 *
827 * Returns: errno
828 */
829
830 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
831 struct dentry *dentry)
832 {
833 struct gfs2_inode *dip = GFS2_I(dir);
834 struct gfs2_sbd *sdp = GFS2_SB(dir);
835 struct inode *inode = old_dentry->d_inode;
836 struct gfs2_inode *ip = GFS2_I(inode);
837 struct gfs2_holder ghs[2];
838 struct buffer_head *dibh;
839 int alloc_required;
840 int error;
841
842 if (S_ISDIR(inode->i_mode))
843 return -EPERM;
844
845 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
846 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
847
848 error = gfs2_glock_nq(ghs); /* parent */
849 if (error)
850 goto out_parent;
851
852 error = gfs2_glock_nq(ghs + 1); /* child */
853 if (error)
854 goto out_child;
855
856 error = -ENOENT;
857 if (inode->i_nlink == 0)
858 goto out_gunlock;
859
860 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC, 0);
861 if (error)
862 goto out_gunlock;
863
864 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
865 switch (error) {
866 case -ENOENT:
867 break;
868 case 0:
869 error = -EEXIST;
870 default:
871 goto out_gunlock;
872 }
873
874 error = -EINVAL;
875 if (!dip->i_inode.i_nlink)
876 goto out_gunlock;
877 error = -EFBIG;
878 if (dip->i_entries == (u32)-1)
879 goto out_gunlock;
880 error = -EPERM;
881 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
882 goto out_gunlock;
883 error = -EINVAL;
884 if (!ip->i_inode.i_nlink)
885 goto out_gunlock;
886 error = -EMLINK;
887 if (ip->i_inode.i_nlink == (u32)-1)
888 goto out_gunlock;
889
890 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
891 if (error < 0)
892 goto out_gunlock;
893 error = 0;
894
895 if (alloc_required) {
896 struct gfs2_alloc *al = gfs2_alloc_get(dip);
897 if (!al) {
898 error = -ENOMEM;
899 goto out_gunlock;
900 }
901
902 error = gfs2_quota_lock_check(dip);
903 if (error)
904 goto out_alloc;
905
906 al->al_requested = sdp->sd_max_dirres;
907
908 error = gfs2_inplace_reserve(dip);
909 if (error)
910 goto out_gunlock_q;
911
912 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
913 gfs2_rg_blocks(al) +
914 2 * RES_DINODE + RES_STATFS +
915 RES_QUOTA, 0);
916 if (error)
917 goto out_ipres;
918 } else {
919 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
920 if (error)
921 goto out_ipres;
922 }
923
924 error = gfs2_meta_inode_buffer(ip, &dibh);
925 if (error)
926 goto out_end_trans;
927
928 error = gfs2_dir_add(dir, &dentry->d_name, ip);
929 if (error)
930 goto out_brelse;
931
932 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
933 inc_nlink(&ip->i_inode);
934 ip->i_inode.i_ctime = CURRENT_TIME;
935 gfs2_dinode_out(ip, dibh->b_data);
936 mark_inode_dirty(&ip->i_inode);
937
938 out_brelse:
939 brelse(dibh);
940 out_end_trans:
941 gfs2_trans_end(sdp);
942 out_ipres:
943 if (alloc_required)
944 gfs2_inplace_release(dip);
945 out_gunlock_q:
946 if (alloc_required)
947 gfs2_quota_unlock(dip);
948 out_alloc:
949 if (alloc_required)
950 gfs2_alloc_put(dip);
951 out_gunlock:
952 gfs2_glock_dq(ghs + 1);
953 out_child:
954 gfs2_glock_dq(ghs);
955 out_parent:
956 gfs2_holder_uninit(ghs);
957 gfs2_holder_uninit(ghs + 1);
958 if (!error) {
959 ihold(inode);
960 d_instantiate(dentry, inode);
961 mark_inode_dirty(inode);
962 }
963 return error;
964 }
965
966 /*
967 * gfs2_unlink_ok - check to see that a inode is still in a directory
968 * @dip: the directory
969 * @name: the name of the file
970 * @ip: the inode
971 *
972 * Assumes that the lock on (at least) @dip is held.
973 *
974 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
975 */
976
977 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
978 const struct gfs2_inode *ip)
979 {
980 int error;
981
982 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
983 return -EPERM;
984
985 if ((dip->i_inode.i_mode & S_ISVTX) &&
986 dip->i_inode.i_uid != current_fsuid() &&
987 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
988 return -EPERM;
989
990 if (IS_APPEND(&dip->i_inode))
991 return -EPERM;
992
993 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0);
994 if (error)
995 return error;
996
997 error = gfs2_dir_check(&dip->i_inode, name, ip);
998 if (error)
999 return error;
1000
1001 return 0;
1002 }
1003
1004 /**
1005 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1006 * @dip: The parent directory
1007 * @name: The name of the entry in the parent directory
1008 * @bh: The inode buffer for the inode to be removed
1009 * @inode: The inode to be removed
1010 *
1011 * Called with all the locks and in a transaction. This will only be
1012 * called for a directory after it has been checked to ensure it is empty.
1013 *
1014 * Returns: 0 on success, or an error
1015 */
1016
1017 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1018 const struct dentry *dentry,
1019 struct buffer_head *bh)
1020 {
1021 struct inode *inode = dentry->d_inode;
1022 struct gfs2_inode *ip = GFS2_I(inode);
1023 int error;
1024
1025 error = gfs2_dir_del(dip, dentry);
1026 if (error)
1027 return error;
1028
1029 ip->i_entries = 0;
1030 inode->i_ctime = CURRENT_TIME;
1031 if (S_ISDIR(inode->i_mode))
1032 clear_nlink(inode);
1033 else
1034 drop_nlink(inode);
1035 gfs2_trans_add_bh(ip->i_gl, bh, 1);
1036 gfs2_dinode_out(ip, bh->b_data);
1037 mark_inode_dirty(inode);
1038 if (inode->i_nlink == 0)
1039 gfs2_unlink_di(inode);
1040 return 0;
1041 }
1042
1043
1044 /**
1045 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1046 * @dir: The inode of the directory containing the inode to unlink
1047 * @dentry: The file itself
1048 *
1049 * This routine uses the type of the inode as a flag to figure out
1050 * whether this is an unlink or an rmdir.
1051 *
1052 * Returns: errno
1053 */
1054
1055 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1056 {
1057 struct gfs2_inode *dip = GFS2_I(dir);
1058 struct gfs2_sbd *sdp = GFS2_SB(dir);
1059 struct inode *inode = dentry->d_inode;
1060 struct gfs2_inode *ip = GFS2_I(inode);
1061 struct buffer_head *bh;
1062 struct gfs2_holder ghs[3];
1063 struct gfs2_rgrpd *rgd;
1064 struct gfs2_holder ri_gh;
1065 int error;
1066
1067 error = gfs2_rindex_hold(sdp, &ri_gh);
1068 if (error)
1069 return error;
1070
1071 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1072 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1073
1074 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
1075 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1076
1077
1078 error = gfs2_glock_nq(ghs); /* parent */
1079 if (error)
1080 goto out_parent;
1081
1082 error = gfs2_glock_nq(ghs + 1); /* child */
1083 if (error)
1084 goto out_child;
1085
1086 error = -ENOENT;
1087 if (inode->i_nlink == 0)
1088 goto out_rgrp;
1089
1090 if (S_ISDIR(inode->i_mode)) {
1091 error = -ENOTEMPTY;
1092 if (ip->i_entries > 2 || inode->i_nlink > 2)
1093 goto out_rgrp;
1094 }
1095
1096 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1097 if (error)
1098 goto out_rgrp;
1099
1100 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1101 if (error)
1102 goto out_gunlock;
1103
1104 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1105 if (error)
1106 goto out_gunlock;
1107
1108 error = gfs2_meta_inode_buffer(ip, &bh);
1109 if (error)
1110 goto out_end_trans;
1111
1112 error = gfs2_unlink_inode(dip, dentry, bh);
1113 brelse(bh);
1114
1115 out_end_trans:
1116 gfs2_trans_end(sdp);
1117 out_gunlock:
1118 gfs2_glock_dq(ghs + 2);
1119 out_rgrp:
1120 gfs2_holder_uninit(ghs + 2);
1121 gfs2_glock_dq(ghs + 1);
1122 out_child:
1123 gfs2_holder_uninit(ghs + 1);
1124 gfs2_glock_dq(ghs);
1125 out_parent:
1126 gfs2_holder_uninit(ghs);
1127 gfs2_glock_dq_uninit(&ri_gh);
1128 return error;
1129 }
1130
1131 /**
1132 * gfs2_symlink - Create a symlink
1133 * @dir: The directory to create the symlink in
1134 * @dentry: The dentry to put the symlink in
1135 * @symname: The thing which the link points to
1136 *
1137 * Returns: errno
1138 */
1139
1140 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1141 const char *symname)
1142 {
1143 struct gfs2_sbd *sdp = GFS2_SB(dir);
1144 unsigned int size;
1145
1146 size = strlen(symname);
1147 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1148 return -ENAMETOOLONG;
1149
1150 return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size);
1151 }
1152
1153 /**
1154 * gfs2_mkdir - Make a directory
1155 * @dir: The parent directory of the new one
1156 * @dentry: The dentry of the new directory
1157 * @mode: The mode of the new directory
1158 *
1159 * Returns: errno
1160 */
1161
1162 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1163 {
1164 return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 0);
1165 }
1166
1167 /**
1168 * gfs2_mknod - Make a special file
1169 * @dir: The directory in which the special file will reside
1170 * @dentry: The dentry of the special file
1171 * @mode: The mode of the special file
1172 * @dev: The device specification of the special file
1173 *
1174 */
1175
1176 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
1177 dev_t dev)
1178 {
1179 return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0);
1180 }
1181
1182 /*
1183 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1184 * @this: move this
1185 * @to: to here
1186 *
1187 * Follow @to back to the root and make sure we don't encounter @this
1188 * Assumes we already hold the rename lock.
1189 *
1190 * Returns: errno
1191 */
1192
1193 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1194 {
1195 struct inode *dir = &to->i_inode;
1196 struct super_block *sb = dir->i_sb;
1197 struct inode *tmp;
1198 int error = 0;
1199
1200 igrab(dir);
1201
1202 for (;;) {
1203 if (dir == &this->i_inode) {
1204 error = -EINVAL;
1205 break;
1206 }
1207 if (dir == sb->s_root->d_inode) {
1208 error = 0;
1209 break;
1210 }
1211
1212 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1213 if (IS_ERR(tmp)) {
1214 error = PTR_ERR(tmp);
1215 break;
1216 }
1217
1218 iput(dir);
1219 dir = tmp;
1220 }
1221
1222 iput(dir);
1223
1224 return error;
1225 }
1226
1227 /**
1228 * gfs2_rename - Rename a file
1229 * @odir: Parent directory of old file name
1230 * @odentry: The old dentry of the file
1231 * @ndir: Parent directory of new file name
1232 * @ndentry: The new dentry of the file
1233 *
1234 * Returns: errno
1235 */
1236
1237 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1238 struct inode *ndir, struct dentry *ndentry)
1239 {
1240 struct gfs2_inode *odip = GFS2_I(odir);
1241 struct gfs2_inode *ndip = GFS2_I(ndir);
1242 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1243 struct gfs2_inode *nip = NULL;
1244 struct gfs2_sbd *sdp = GFS2_SB(odir);
1245 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }, ri_gh;
1246 struct gfs2_rgrpd *nrgd;
1247 unsigned int num_gh;
1248 int dir_rename = 0;
1249 int alloc_required = 0;
1250 unsigned int x;
1251 int error;
1252
1253 if (ndentry->d_inode) {
1254 nip = GFS2_I(ndentry->d_inode);
1255 if (ip == nip)
1256 return 0;
1257 }
1258
1259 error = gfs2_rindex_hold(sdp, &ri_gh);
1260 if (error)
1261 return error;
1262
1263 if (odip != ndip) {
1264 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1265 0, &r_gh);
1266 if (error)
1267 goto out;
1268
1269 if (S_ISDIR(ip->i_inode.i_mode)) {
1270 dir_rename = 1;
1271 /* don't move a dirctory into it's subdir */
1272 error = gfs2_ok_to_move(ip, ndip);
1273 if (error)
1274 goto out_gunlock_r;
1275 }
1276 }
1277
1278 num_gh = 1;
1279 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1280 if (odip != ndip) {
1281 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1282 num_gh++;
1283 }
1284 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1285 num_gh++;
1286
1287 if (nip) {
1288 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1289 num_gh++;
1290 /* grab the resource lock for unlink flag twiddling
1291 * this is the case of the target file already existing
1292 * so we unlink before doing the rename
1293 */
1294 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
1295 if (nrgd)
1296 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1297 }
1298
1299 for (x = 0; x < num_gh; x++) {
1300 error = gfs2_glock_nq(ghs + x);
1301 if (error)
1302 goto out_gunlock;
1303 }
1304
1305 error = -ENOENT;
1306 if (ip->i_inode.i_nlink == 0)
1307 goto out_gunlock;
1308
1309 /* Check out the old directory */
1310
1311 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1312 if (error)
1313 goto out_gunlock;
1314
1315 /* Check out the new directory */
1316
1317 if (nip) {
1318 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1319 if (error)
1320 goto out_gunlock;
1321
1322 if (nip->i_inode.i_nlink == 0) {
1323 error = -EAGAIN;
1324 goto out_gunlock;
1325 }
1326
1327 if (S_ISDIR(nip->i_inode.i_mode)) {
1328 if (nip->i_entries < 2) {
1329 gfs2_consist_inode(nip);
1330 error = -EIO;
1331 goto out_gunlock;
1332 }
1333 if (nip->i_entries > 2) {
1334 error = -ENOTEMPTY;
1335 goto out_gunlock;
1336 }
1337 }
1338 } else {
1339 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC, 0);
1340 if (error)
1341 goto out_gunlock;
1342
1343 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1344 switch (error) {
1345 case -ENOENT:
1346 error = 0;
1347 break;
1348 case 0:
1349 error = -EEXIST;
1350 default:
1351 goto out_gunlock;
1352 };
1353
1354 if (odip != ndip) {
1355 if (!ndip->i_inode.i_nlink) {
1356 error = -ENOENT;
1357 goto out_gunlock;
1358 }
1359 if (ndip->i_entries == (u32)-1) {
1360 error = -EFBIG;
1361 goto out_gunlock;
1362 }
1363 if (S_ISDIR(ip->i_inode.i_mode) &&
1364 ndip->i_inode.i_nlink == (u32)-1) {
1365 error = -EMLINK;
1366 goto out_gunlock;
1367 }
1368 }
1369 }
1370
1371 /* Check out the dir to be renamed */
1372
1373 if (dir_rename) {
1374 error = gfs2_permission(odentry->d_inode, MAY_WRITE, 0);
1375 if (error)
1376 goto out_gunlock;
1377 }
1378
1379 if (nip == NULL)
1380 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1381 error = alloc_required;
1382 if (error < 0)
1383 goto out_gunlock;
1384 error = 0;
1385
1386 if (alloc_required) {
1387 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
1388 if (!al) {
1389 error = -ENOMEM;
1390 goto out_gunlock;
1391 }
1392
1393 error = gfs2_quota_lock_check(ndip);
1394 if (error)
1395 goto out_alloc;
1396
1397 al->al_requested = sdp->sd_max_dirres;
1398
1399 error = gfs2_inplace_reserve_ri(ndip);
1400 if (error)
1401 goto out_gunlock_q;
1402
1403 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1404 gfs2_rg_blocks(al) +
1405 4 * RES_DINODE + 4 * RES_LEAF +
1406 RES_STATFS + RES_QUOTA + 4, 0);
1407 if (error)
1408 goto out_ipreserv;
1409 } else {
1410 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1411 5 * RES_LEAF + 4, 0);
1412 if (error)
1413 goto out_gunlock;
1414 }
1415
1416 /* Remove the target file, if it exists */
1417
1418 if (nip) {
1419 struct buffer_head *bh;
1420 error = gfs2_meta_inode_buffer(nip, &bh);
1421 if (error)
1422 goto out_end_trans;
1423 error = gfs2_unlink_inode(ndip, ndentry, bh);
1424 brelse(bh);
1425 }
1426
1427 if (dir_rename) {
1428 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1429 if (error)
1430 goto out_end_trans;
1431 } else {
1432 struct buffer_head *dibh;
1433 error = gfs2_meta_inode_buffer(ip, &dibh);
1434 if (error)
1435 goto out_end_trans;
1436 ip->i_inode.i_ctime = CURRENT_TIME;
1437 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1438 gfs2_dinode_out(ip, dibh->b_data);
1439 brelse(dibh);
1440 }
1441
1442 error = gfs2_dir_del(odip, odentry);
1443 if (error)
1444 goto out_end_trans;
1445
1446 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1447 if (error)
1448 goto out_end_trans;
1449
1450 out_end_trans:
1451 gfs2_trans_end(sdp);
1452 out_ipreserv:
1453 if (alloc_required)
1454 gfs2_inplace_release(ndip);
1455 out_gunlock_q:
1456 if (alloc_required)
1457 gfs2_quota_unlock(ndip);
1458 out_alloc:
1459 if (alloc_required)
1460 gfs2_alloc_put(ndip);
1461 out_gunlock:
1462 while (x--) {
1463 gfs2_glock_dq(ghs + x);
1464 gfs2_holder_uninit(ghs + x);
1465 }
1466 out_gunlock_r:
1467 if (r_gh.gh_gl)
1468 gfs2_glock_dq_uninit(&r_gh);
1469 out:
1470 gfs2_glock_dq_uninit(&ri_gh);
1471 return error;
1472 }
1473
1474 /**
1475 * gfs2_follow_link - Follow a symbolic link
1476 * @dentry: The dentry of the link
1477 * @nd: Data that we pass to vfs_follow_link()
1478 *
1479 * This can handle symlinks of any size.
1480 *
1481 * Returns: 0 on success or error code
1482 */
1483
1484 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1485 {
1486 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1487 struct gfs2_holder i_gh;
1488 struct buffer_head *dibh;
1489 unsigned int size;
1490 char *buf;
1491 int error;
1492
1493 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1494 error = gfs2_glock_nq(&i_gh);
1495 if (error) {
1496 gfs2_holder_uninit(&i_gh);
1497 nd_set_link(nd, ERR_PTR(error));
1498 return NULL;
1499 }
1500
1501 size = (unsigned int)i_size_read(&ip->i_inode);
1502 if (size == 0) {
1503 gfs2_consist_inode(ip);
1504 buf = ERR_PTR(-EIO);
1505 goto out;
1506 }
1507
1508 error = gfs2_meta_inode_buffer(ip, &dibh);
1509 if (error) {
1510 buf = ERR_PTR(error);
1511 goto out;
1512 }
1513
1514 buf = kzalloc(size + 1, GFP_NOFS);
1515 if (!buf)
1516 buf = ERR_PTR(-ENOMEM);
1517 else
1518 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1519 brelse(dibh);
1520 out:
1521 gfs2_glock_dq_uninit(&i_gh);
1522 nd_set_link(nd, buf);
1523 return NULL;
1524 }
1525
1526 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1527 {
1528 char *s = nd_get_link(nd);
1529 if (!IS_ERR(s))
1530 kfree(s);
1531 }
1532
1533 /**
1534 * gfs2_permission -
1535 * @inode: The inode
1536 * @mask: The mask to be tested
1537 * @flags: Indicates whether this is an RCU path walk or not
1538 *
1539 * This may be called from the VFS directly, or from within GFS2 with the
1540 * inode locked, so we look to see if the glock is already locked and only
1541 * lock the glock if its not already been done.
1542 *
1543 * Returns: errno
1544 */
1545
1546 int gfs2_permission(struct inode *inode, int mask, unsigned int flags)
1547 {
1548 struct gfs2_inode *ip;
1549 struct gfs2_holder i_gh;
1550 int error;
1551 int unlock = 0;
1552
1553
1554 ip = GFS2_I(inode);
1555 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1556 if (flags & IPERM_FLAG_RCU)
1557 return -ECHILD;
1558 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1559 if (error)
1560 return error;
1561 unlock = 1;
1562 }
1563
1564 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1565 error = -EACCES;
1566 else
1567 error = generic_permission(inode, mask, flags, gfs2_check_acl);
1568 if (unlock)
1569 gfs2_glock_dq_uninit(&i_gh);
1570
1571 return error;
1572 }
1573
1574 static int __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1575 {
1576 struct inode *inode = &ip->i_inode;
1577 struct buffer_head *dibh;
1578 int error;
1579
1580 error = gfs2_meta_inode_buffer(ip, &dibh);
1581 if (error)
1582 return error;
1583
1584 setattr_copy(inode, attr);
1585 mark_inode_dirty(inode);
1586 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1587 gfs2_dinode_out(ip, dibh->b_data);
1588 brelse(dibh);
1589 return 0;
1590 }
1591
1592 /**
1593 * gfs2_setattr_simple -
1594 * @ip:
1595 * @attr:
1596 *
1597 * Returns: errno
1598 */
1599
1600 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1601 {
1602 int error;
1603
1604 if (current->journal_info)
1605 return __gfs2_setattr_simple(ip, attr);
1606
1607 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1608 if (error)
1609 return error;
1610
1611 error = __gfs2_setattr_simple(ip, attr);
1612 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1613 return error;
1614 }
1615
1616 static int setattr_chown(struct inode *inode, struct iattr *attr)
1617 {
1618 struct gfs2_inode *ip = GFS2_I(inode);
1619 struct gfs2_sbd *sdp = GFS2_SB(inode);
1620 u32 ouid, ogid, nuid, ngid;
1621 int error;
1622
1623 ouid = inode->i_uid;
1624 ogid = inode->i_gid;
1625 nuid = attr->ia_uid;
1626 ngid = attr->ia_gid;
1627
1628 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1629 ouid = nuid = NO_QUOTA_CHANGE;
1630 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1631 ogid = ngid = NO_QUOTA_CHANGE;
1632
1633 if (!gfs2_alloc_get(ip))
1634 return -ENOMEM;
1635
1636 error = gfs2_quota_lock(ip, nuid, ngid);
1637 if (error)
1638 goto out_alloc;
1639
1640 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1641 error = gfs2_quota_check(ip, nuid, ngid);
1642 if (error)
1643 goto out_gunlock_q;
1644 }
1645
1646 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1647 if (error)
1648 goto out_gunlock_q;
1649
1650 error = gfs2_setattr_simple(ip, attr);
1651 if (error)
1652 goto out_end_trans;
1653
1654 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1655 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1656 gfs2_quota_change(ip, -blocks, ouid, ogid);
1657 gfs2_quota_change(ip, blocks, nuid, ngid);
1658 }
1659
1660 out_end_trans:
1661 gfs2_trans_end(sdp);
1662 out_gunlock_q:
1663 gfs2_quota_unlock(ip);
1664 out_alloc:
1665 gfs2_alloc_put(ip);
1666 return error;
1667 }
1668
1669 /**
1670 * gfs2_setattr - Change attributes on an inode
1671 * @dentry: The dentry which is changing
1672 * @attr: The structure describing the change
1673 *
1674 * The VFS layer wants to change one or more of an inodes attributes. Write
1675 * that change out to disk.
1676 *
1677 * Returns: errno
1678 */
1679
1680 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1681 {
1682 struct inode *inode = dentry->d_inode;
1683 struct gfs2_inode *ip = GFS2_I(inode);
1684 struct gfs2_holder i_gh;
1685 int error;
1686
1687 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1688 if (error)
1689 return error;
1690
1691 error = -EPERM;
1692 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1693 goto out;
1694
1695 error = inode_change_ok(inode, attr);
1696 if (error)
1697 goto out;
1698
1699 if (attr->ia_valid & ATTR_SIZE)
1700 error = gfs2_setattr_size(inode, attr->ia_size);
1701 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1702 error = setattr_chown(inode, attr);
1703 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1704 error = gfs2_acl_chmod(ip, attr);
1705 else
1706 error = gfs2_setattr_simple(ip, attr);
1707
1708 out:
1709 gfs2_glock_dq_uninit(&i_gh);
1710 if (!error)
1711 mark_inode_dirty(inode);
1712 return error;
1713 }
1714
1715 /**
1716 * gfs2_getattr - Read out an inode's attributes
1717 * @mnt: The vfsmount the inode is being accessed from
1718 * @dentry: The dentry to stat
1719 * @stat: The inode's stats
1720 *
1721 * This may be called from the VFS directly, or from within GFS2 with the
1722 * inode locked, so we look to see if the glock is already locked and only
1723 * lock the glock if its not already been done. Note that its the NFS
1724 * readdirplus operation which causes this to be called (from filldir)
1725 * with the glock already held.
1726 *
1727 * Returns: errno
1728 */
1729
1730 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1731 struct kstat *stat)
1732 {
1733 struct inode *inode = dentry->d_inode;
1734 struct gfs2_inode *ip = GFS2_I(inode);
1735 struct gfs2_holder gh;
1736 int error;
1737 int unlock = 0;
1738
1739 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1740 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1741 if (error)
1742 return error;
1743 unlock = 1;
1744 }
1745
1746 generic_fillattr(inode, stat);
1747 if (unlock)
1748 gfs2_glock_dq_uninit(&gh);
1749
1750 return 0;
1751 }
1752
1753 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1754 const void *data, size_t size, int flags)
1755 {
1756 struct inode *inode = dentry->d_inode;
1757 struct gfs2_inode *ip = GFS2_I(inode);
1758 struct gfs2_holder gh;
1759 int ret;
1760
1761 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1762 ret = gfs2_glock_nq(&gh);
1763 if (ret == 0) {
1764 ret = generic_setxattr(dentry, name, data, size, flags);
1765 gfs2_glock_dq(&gh);
1766 }
1767 gfs2_holder_uninit(&gh);
1768 return ret;
1769 }
1770
1771 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1772 void *data, size_t size)
1773 {
1774 struct inode *inode = dentry->d_inode;
1775 struct gfs2_inode *ip = GFS2_I(inode);
1776 struct gfs2_holder gh;
1777 int ret;
1778
1779 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1780 ret = gfs2_glock_nq(&gh);
1781 if (ret == 0) {
1782 ret = generic_getxattr(dentry, name, data, size);
1783 gfs2_glock_dq(&gh);
1784 }
1785 gfs2_holder_uninit(&gh);
1786 return ret;
1787 }
1788
1789 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1790 {
1791 struct inode *inode = dentry->d_inode;
1792 struct gfs2_inode *ip = GFS2_I(inode);
1793 struct gfs2_holder gh;
1794 int ret;
1795
1796 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1797 ret = gfs2_glock_nq(&gh);
1798 if (ret == 0) {
1799 ret = generic_removexattr(dentry, name);
1800 gfs2_glock_dq(&gh);
1801 }
1802 gfs2_holder_uninit(&gh);
1803 return ret;
1804 }
1805
1806 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1807 u64 start, u64 len)
1808 {
1809 struct gfs2_inode *ip = GFS2_I(inode);
1810 struct gfs2_holder gh;
1811 int ret;
1812
1813 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1814 if (ret)
1815 return ret;
1816
1817 mutex_lock(&inode->i_mutex);
1818
1819 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1820 if (ret)
1821 goto out;
1822
1823 if (gfs2_is_stuffed(ip)) {
1824 u64 phys = ip->i_no_addr << inode->i_blkbits;
1825 u64 size = i_size_read(inode);
1826 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1827 FIEMAP_EXTENT_DATA_INLINE;
1828 phys += sizeof(struct gfs2_dinode);
1829 phys += start;
1830 if (start + len > size)
1831 len = size - start;
1832 if (start < size)
1833 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1834 len, flags);
1835 if (ret == 1)
1836 ret = 0;
1837 } else {
1838 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1839 gfs2_block_map);
1840 }
1841
1842 gfs2_glock_dq_uninit(&gh);
1843 out:
1844 mutex_unlock(&inode->i_mutex);
1845 return ret;
1846 }
1847
1848 const struct inode_operations gfs2_file_iops = {
1849 .permission = gfs2_permission,
1850 .setattr = gfs2_setattr,
1851 .getattr = gfs2_getattr,
1852 .setxattr = gfs2_setxattr,
1853 .getxattr = gfs2_getxattr,
1854 .listxattr = gfs2_listxattr,
1855 .removexattr = gfs2_removexattr,
1856 .fiemap = gfs2_fiemap,
1857 };
1858
1859 const struct inode_operations gfs2_dir_iops = {
1860 .create = gfs2_create,
1861 .lookup = gfs2_lookup,
1862 .link = gfs2_link,
1863 .unlink = gfs2_unlink,
1864 .symlink = gfs2_symlink,
1865 .mkdir = gfs2_mkdir,
1866 .rmdir = gfs2_unlink,
1867 .mknod = gfs2_mknod,
1868 .rename = gfs2_rename,
1869 .permission = gfs2_permission,
1870 .setattr = gfs2_setattr,
1871 .getattr = gfs2_getattr,
1872 .setxattr = gfs2_setxattr,
1873 .getxattr = gfs2_getxattr,
1874 .listxattr = gfs2_listxattr,
1875 .removexattr = gfs2_removexattr,
1876 .fiemap = gfs2_fiemap,
1877 };
1878
1879 const struct inode_operations gfs2_symlink_iops = {
1880 .readlink = generic_readlink,
1881 .follow_link = gfs2_follow_link,
1882 .put_link = gfs2_put_link,
1883 .permission = gfs2_permission,
1884 .setattr = gfs2_setattr,
1885 .getattr = gfs2_getattr,
1886 .setxattr = gfs2_setxattr,
1887 .getxattr = gfs2_getxattr,
1888 .listxattr = gfs2_listxattr,
1889 .removexattr = gfs2_removexattr,
1890 .fiemap = gfs2_fiemap,
1891 };
1892
linux-next