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GFS2: Clean up symlink creation
[deliverable/linux.git] / fs / gfs2 / inode.c
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 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, const struct gfs2_inode *parent)
417 {
418 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
419 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
420
421 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
422 dent->de_inum = di->di_num; /* already GFS2 endian */
423 dent->de_type = cpu_to_be16(DT_DIR);
424
425 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
426 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
427 gfs2_inum_out(parent, dent);
428 dent->de_type = cpu_to_be16(DT_DIR);
429
430 }
431
432 /**
433 * init_dinode - Fill in a new dinode structure
434 * @dip: the directory this inode is being created in
435 * @gl: The glock covering the new inode
436 * @inum: the inode number
437 * @mode: the file permissions
438 * @uid:
439 * @gid:
440 *
441 */
442
443 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
444 const struct gfs2_inum_host *inum, unsigned int mode,
445 unsigned int uid, unsigned int gid,
446 const u64 *generation, dev_t dev, const char *symname,
447 unsigned size, struct buffer_head **bhp)
448 {
449 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
450 struct gfs2_dinode *di;
451 struct buffer_head *dibh;
452 struct timespec tv = CURRENT_TIME;
453
454 dibh = gfs2_meta_new(gl, inum->no_addr);
455 gfs2_trans_add_bh(gl, dibh, 1);
456 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
457 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
458 di = (struct gfs2_dinode *)dibh->b_data;
459
460 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
461 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
462 di->di_mode = cpu_to_be32(mode);
463 di->di_uid = cpu_to_be32(uid);
464 di->di_gid = cpu_to_be32(gid);
465 di->di_nlink = 0;
466 di->di_size = cpu_to_be64(size);
467 di->di_blocks = cpu_to_be64(1);
468 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec);
469 di->di_major = cpu_to_be32(MAJOR(dev));
470 di->di_minor = cpu_to_be32(MINOR(dev));
471 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
472 di->di_generation = cpu_to_be64(*generation);
473 di->di_flags = 0;
474 di->__pad1 = 0;
475 di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
476 di->di_height = 0;
477 di->__pad2 = 0;
478 di->__pad3 = 0;
479 di->di_depth = 0;
480 di->di_entries = 0;
481 memset(&di->__pad4, 0, sizeof(di->__pad4));
482 di->di_eattr = 0;
483 di->di_atime_nsec = cpu_to_be32(tv.tv_nsec);
484 di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec);
485 di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec);
486 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
487
488 switch(mode & S_IFMT) {
489 case S_IFREG:
490 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
491 gfs2_tune_get(sdp, gt_new_files_jdata))
492 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
493 break;
494 case S_IFDIR:
495 di->di_flags |= cpu_to_be32(dip->i_diskflags &
496 GFS2_DIF_INHERIT_JDATA);
497 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
498 di->di_size = cpu_to_be64(sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode));
499 di->di_entries = cpu_to_be32(2);
500 gfs2_init_dir(dibh, dip);
501 break;
502 case S_IFLNK:
503 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, size);
504 break;
505 }
506
507 set_buffer_uptodate(dibh);
508
509 *bhp = dibh;
510 }
511
512 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
513 unsigned int mode, const struct gfs2_inum_host *inum,
514 const u64 *generation, dev_t dev, const char *symname,
515 unsigned int size, struct buffer_head **bhp)
516 {
517 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
518 unsigned int uid, gid;
519 int error;
520
521 munge_mode_uid_gid(dip, &mode, &uid, &gid);
522 if (!gfs2_alloc_get(dip))
523 return -ENOMEM;
524
525 error = gfs2_quota_lock(dip, uid, gid);
526 if (error)
527 goto out;
528
529 error = gfs2_quota_check(dip, uid, gid);
530 if (error)
531 goto out_quota;
532
533 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
534 if (error)
535 goto out_quota;
536
537 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, symname, size, bhp);
538 gfs2_quota_change(dip, +1, uid, gid);
539 gfs2_trans_end(sdp);
540
541 out_quota:
542 gfs2_quota_unlock(dip);
543 out:
544 gfs2_alloc_put(dip);
545 return error;
546 }
547
548 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
549 struct gfs2_inode *ip)
550 {
551 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
552 struct gfs2_alloc *al;
553 int alloc_required;
554 struct buffer_head *dibh;
555 int error;
556
557 al = gfs2_alloc_get(dip);
558 if (!al)
559 return -ENOMEM;
560
561 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
562 if (error)
563 goto fail;
564
565 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
566 if (alloc_required < 0)
567 goto fail_quota_locks;
568 if (alloc_required) {
569 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
570 if (error)
571 goto fail_quota_locks;
572
573 al->al_requested = sdp->sd_max_dirres;
574
575 error = gfs2_inplace_reserve(dip);
576 if (error)
577 goto fail_quota_locks;
578
579 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
580 al->al_rgd->rd_length +
581 2 * RES_DINODE +
582 RES_STATFS + RES_QUOTA, 0);
583 if (error)
584 goto fail_ipreserv;
585 } else {
586 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
587 if (error)
588 goto fail_quota_locks;
589 }
590
591 error = gfs2_dir_add(&dip->i_inode, name, ip);
592 if (error)
593 goto fail_end_trans;
594
595 error = gfs2_meta_inode_buffer(ip, &dibh);
596 if (error)
597 goto fail_end_trans;
598 inc_nlink(&ip->i_inode);
599 if (S_ISDIR(ip->i_inode.i_mode))
600 inc_nlink(&ip->i_inode);
601 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
602 gfs2_dinode_out(ip, dibh->b_data);
603 brelse(dibh);
604 return 0;
605
606 fail_end_trans:
607 gfs2_trans_end(sdp);
608
609 fail_ipreserv:
610 if (dip->i_alloc->al_rgd)
611 gfs2_inplace_release(dip);
612
613 fail_quota_locks:
614 gfs2_quota_unlock(dip);
615
616 fail:
617 gfs2_alloc_put(dip);
618 return error;
619 }
620
621 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
622 const struct qstr *qstr)
623 {
624 int err;
625 size_t len;
626 void *value;
627 char *name;
628
629 err = security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
630 &name, &value, &len);
631
632 if (err) {
633 if (err == -EOPNOTSUPP)
634 return 0;
635 return err;
636 }
637
638 err = __gfs2_xattr_set(&ip->i_inode, name, value, len, 0,
639 GFS2_EATYPE_SECURITY);
640 kfree(value);
641 kfree(name);
642
643 return err;
644 }
645
646 /**
647 * gfs2_createi - Create a new inode
648 * @ghs: An array of two holders
649 * @name: The name of the new file
650 * @mode: the permissions on the new inode
651 *
652 * @ghs[0] is an initialized holder for the directory
653 * @ghs[1] is the holder for the inode lock
654 *
655 * If the return value is not NULL, the glocks on both the directory and the new
656 * file are held. A transaction has been started and an inplace reservation
657 * is held, as well.
658 *
659 * Returns: An inode
660 */
661
662 static struct inode *gfs2_createi(struct gfs2_holder *ghs,
663 const struct qstr *name, unsigned int mode,
664 dev_t dev, const char *symname,
665 unsigned int size)
666 {
667 struct inode *inode = NULL;
668 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
669 struct inode *dir = &dip->i_inode;
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 ERR_PTR(-ENAMETOOLONG);
678
679 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
680 error = gfs2_glock_nq(ghs);
681 if (error)
682 goto fail;
683
684 error = create_ok(dip, name, mode);
685 if (error)
686 goto fail_gunlock;
687
688 error = alloc_dinode(dip, &inum.no_addr, &generation);
689 if (error)
690 goto fail_gunlock;
691 inum.no_formal_ino = generation;
692
693 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
694 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
695 if (error)
696 goto fail_gunlock;
697
698 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, symname, size, &bh);
699 if (error)
700 goto fail_gunlock2;
701
702 inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr,
703 inum.no_formal_ino, 0);
704 if (IS_ERR(inode))
705 goto fail_gunlock2;
706
707 error = gfs2_inode_refresh(GFS2_I(inode));
708 if (error)
709 goto fail_gunlock2;
710
711 error = gfs2_acl_create(dip, inode);
712 if (error)
713 goto fail_gunlock2;
714
715 error = gfs2_security_init(dip, GFS2_I(inode), name);
716 if (error)
717 goto fail_gunlock2;
718
719 error = link_dinode(dip, name, GFS2_I(inode));
720 if (error)
721 goto fail_gunlock2;
722
723 if (bh)
724 brelse(bh);
725 return inode;
726
727 fail_gunlock2:
728 gfs2_glock_dq_uninit(ghs + 1);
729 if (inode && !IS_ERR(inode))
730 iput(inode);
731 fail_gunlock:
732 gfs2_glock_dq(ghs);
733 fail:
734 if (bh)
735 brelse(bh);
736 return ERR_PTR(error);
737 }
738 /**
739 * gfs2_create - Create a file
740 * @dir: The directory in which to create the file
741 * @dentry: The dentry of the new file
742 * @mode: The mode of the new file
743 *
744 * Returns: errno
745 */
746
747 static int gfs2_create(struct inode *dir, struct dentry *dentry,
748 int mode, struct nameidata *nd)
749 {
750 struct gfs2_inode *dip = GFS2_I(dir);
751 struct gfs2_sbd *sdp = GFS2_SB(dir);
752 struct gfs2_holder ghs[2];
753 struct inode *inode;
754
755 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
756
757 for (;;) {
758 inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0, NULL, 0);
759 if (!IS_ERR(inode)) {
760 gfs2_trans_end(sdp);
761 if (dip->i_alloc->al_rgd)
762 gfs2_inplace_release(dip);
763 gfs2_quota_unlock(dip);
764 gfs2_alloc_put(dip);
765 gfs2_glock_dq_uninit_m(2, ghs);
766 mark_inode_dirty(inode);
767 break;
768 } else if (PTR_ERR(inode) != -EEXIST ||
769 (nd && nd->flags & LOOKUP_EXCL)) {
770 gfs2_holder_uninit(ghs);
771 return PTR_ERR(inode);
772 }
773
774 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
775 if (inode) {
776 if (!IS_ERR(inode)) {
777 gfs2_holder_uninit(ghs);
778 break;
779 } else {
780 gfs2_holder_uninit(ghs);
781 return PTR_ERR(inode);
782 }
783 }
784 }
785
786 d_instantiate(dentry, inode);
787
788 return 0;
789 }
790
791 /**
792 * gfs2_lookup - Look up a filename in a directory and return its inode
793 * @dir: The directory inode
794 * @dentry: The dentry of the new inode
795 * @nd: passed from Linux VFS, ignored by us
796 *
797 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
798 *
799 * Returns: errno
800 */
801
802 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
803 struct nameidata *nd)
804 {
805 struct inode *inode = NULL;
806
807 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
808 if (inode && IS_ERR(inode))
809 return ERR_CAST(inode);
810
811 if (inode) {
812 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
813 struct gfs2_holder gh;
814 int error;
815 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
816 if (error) {
817 iput(inode);
818 return ERR_PTR(error);
819 }
820 gfs2_glock_dq_uninit(&gh);
821 return d_splice_alias(inode, dentry);
822 }
823 d_add(dentry, inode);
824
825 return NULL;
826 }
827
828 /**
829 * gfs2_link - Link to a file
830 * @old_dentry: The inode to link
831 * @dir: Add link to this directory
832 * @dentry: The name of the link
833 *
834 * Link the inode in "old_dentry" into the directory "dir" with the
835 * name in "dentry".
836 *
837 * Returns: errno
838 */
839
840 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
841 struct dentry *dentry)
842 {
843 struct gfs2_inode *dip = GFS2_I(dir);
844 struct gfs2_sbd *sdp = GFS2_SB(dir);
845 struct inode *inode = old_dentry->d_inode;
846 struct gfs2_inode *ip = GFS2_I(inode);
847 struct gfs2_holder ghs[2];
848 struct buffer_head *dibh;
849 int alloc_required;
850 int error;
851
852 if (S_ISDIR(inode->i_mode))
853 return -EPERM;
854
855 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
856 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
857
858 error = gfs2_glock_nq(ghs); /* parent */
859 if (error)
860 goto out_parent;
861
862 error = gfs2_glock_nq(ghs + 1); /* child */
863 if (error)
864 goto out_child;
865
866 error = -ENOENT;
867 if (inode->i_nlink == 0)
868 goto out_gunlock;
869
870 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC, 0);
871 if (error)
872 goto out_gunlock;
873
874 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
875 switch (error) {
876 case -ENOENT:
877 break;
878 case 0:
879 error = -EEXIST;
880 default:
881 goto out_gunlock;
882 }
883
884 error = -EINVAL;
885 if (!dip->i_inode.i_nlink)
886 goto out_gunlock;
887 error = -EFBIG;
888 if (dip->i_entries == (u32)-1)
889 goto out_gunlock;
890 error = -EPERM;
891 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
892 goto out_gunlock;
893 error = -EINVAL;
894 if (!ip->i_inode.i_nlink)
895 goto out_gunlock;
896 error = -EMLINK;
897 if (ip->i_inode.i_nlink == (u32)-1)
898 goto out_gunlock;
899
900 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
901 if (error < 0)
902 goto out_gunlock;
903 error = 0;
904
905 if (alloc_required) {
906 struct gfs2_alloc *al = gfs2_alloc_get(dip);
907 if (!al) {
908 error = -ENOMEM;
909 goto out_gunlock;
910 }
911
912 error = gfs2_quota_lock_check(dip);
913 if (error)
914 goto out_alloc;
915
916 al->al_requested = sdp->sd_max_dirres;
917
918 error = gfs2_inplace_reserve(dip);
919 if (error)
920 goto out_gunlock_q;
921
922 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
923 gfs2_rg_blocks(al) +
924 2 * RES_DINODE + RES_STATFS +
925 RES_QUOTA, 0);
926 if (error)
927 goto out_ipres;
928 } else {
929 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
930 if (error)
931 goto out_ipres;
932 }
933
934 error = gfs2_meta_inode_buffer(ip, &dibh);
935 if (error)
936 goto out_end_trans;
937
938 error = gfs2_dir_add(dir, &dentry->d_name, ip);
939 if (error)
940 goto out_brelse;
941
942 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
943 inc_nlink(&ip->i_inode);
944 ip->i_inode.i_ctime = CURRENT_TIME;
945 gfs2_dinode_out(ip, dibh->b_data);
946 mark_inode_dirty(&ip->i_inode);
947
948 out_brelse:
949 brelse(dibh);
950 out_end_trans:
951 gfs2_trans_end(sdp);
952 out_ipres:
953 if (alloc_required)
954 gfs2_inplace_release(dip);
955 out_gunlock_q:
956 if (alloc_required)
957 gfs2_quota_unlock(dip);
958 out_alloc:
959 if (alloc_required)
960 gfs2_alloc_put(dip);
961 out_gunlock:
962 gfs2_glock_dq(ghs + 1);
963 out_child:
964 gfs2_glock_dq(ghs);
965 out_parent:
966 gfs2_holder_uninit(ghs);
967 gfs2_holder_uninit(ghs + 1);
968 if (!error) {
969 ihold(inode);
970 d_instantiate(dentry, inode);
971 mark_inode_dirty(inode);
972 }
973 return error;
974 }
975
976 /*
977 * gfs2_unlink_ok - check to see that a inode is still in a directory
978 * @dip: the directory
979 * @name: the name of the file
980 * @ip: the inode
981 *
982 * Assumes that the lock on (at least) @dip is held.
983 *
984 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
985 */
986
987 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
988 const struct gfs2_inode *ip)
989 {
990 int error;
991
992 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
993 return -EPERM;
994
995 if ((dip->i_inode.i_mode & S_ISVTX) &&
996 dip->i_inode.i_uid != current_fsuid() &&
997 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
998 return -EPERM;
999
1000 if (IS_APPEND(&dip->i_inode))
1001 return -EPERM;
1002
1003 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0);
1004 if (error)
1005 return error;
1006
1007 error = gfs2_dir_check(&dip->i_inode, name, ip);
1008 if (error)
1009 return error;
1010
1011 return 0;
1012 }
1013
1014 /**
1015 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1016 * @dip: The parent directory
1017 * @name: The name of the entry in the parent directory
1018 * @bh: The inode buffer for the inode to be removed
1019 * @inode: The inode to be removed
1020 *
1021 * Called with all the locks and in a transaction. This will only be
1022 * called for a directory after it has been checked to ensure it is empty.
1023 *
1024 * Returns: 0 on success, or an error
1025 */
1026
1027 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1028 const struct dentry *dentry,
1029 struct buffer_head *bh)
1030 {
1031 struct inode *inode = dentry->d_inode;
1032 struct gfs2_inode *ip = GFS2_I(inode);
1033 int error;
1034
1035 error = gfs2_dir_del(dip, dentry);
1036 if (error)
1037 return error;
1038
1039 ip->i_entries = 0;
1040 inode->i_ctime = CURRENT_TIME;
1041 if (S_ISDIR(inode->i_mode))
1042 clear_nlink(inode);
1043 else
1044 drop_nlink(inode);
1045 gfs2_trans_add_bh(ip->i_gl, bh, 1);
1046 gfs2_dinode_out(ip, bh->b_data);
1047 mark_inode_dirty(inode);
1048 if (inode->i_nlink == 0)
1049 gfs2_unlink_di(inode);
1050 return 0;
1051 }
1052
1053
1054 /**
1055 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1056 * @dir: The inode of the directory containing the inode to unlink
1057 * @dentry: The file itself
1058 *
1059 * This routine uses the type of the inode as a flag to figure out
1060 * whether this is an unlink or an rmdir.
1061 *
1062 * Returns: errno
1063 */
1064
1065 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1066 {
1067 struct gfs2_inode *dip = GFS2_I(dir);
1068 struct gfs2_sbd *sdp = GFS2_SB(dir);
1069 struct inode *inode = dentry->d_inode;
1070 struct gfs2_inode *ip = GFS2_I(inode);
1071 struct buffer_head *bh;
1072 struct gfs2_holder ghs[3];
1073 struct gfs2_rgrpd *rgd;
1074 struct gfs2_holder ri_gh;
1075 int error;
1076
1077 error = gfs2_rindex_hold(sdp, &ri_gh);
1078 if (error)
1079 return error;
1080
1081 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1082 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1083
1084 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
1085 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1086
1087
1088 error = gfs2_glock_nq(ghs); /* parent */
1089 if (error)
1090 goto out_parent;
1091
1092 error = gfs2_glock_nq(ghs + 1); /* child */
1093 if (error)
1094 goto out_child;
1095
1096 error = -ENOENT;
1097 if (inode->i_nlink == 0)
1098 goto out_rgrp;
1099
1100 if (S_ISDIR(inode->i_mode)) {
1101 error = -ENOTEMPTY;
1102 if (ip->i_entries > 2 || inode->i_nlink > 2)
1103 goto out_rgrp;
1104 }
1105
1106 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1107 if (error)
1108 goto out_rgrp;
1109
1110 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1111 if (error)
1112 goto out_gunlock;
1113
1114 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1115 if (error)
1116 goto out_gunlock;
1117
1118 error = gfs2_meta_inode_buffer(ip, &bh);
1119 if (error)
1120 goto out_end_trans;
1121
1122 error = gfs2_unlink_inode(dip, dentry, bh);
1123 brelse(bh);
1124
1125 out_end_trans:
1126 gfs2_trans_end(sdp);
1127 out_gunlock:
1128 gfs2_glock_dq(ghs + 2);
1129 out_rgrp:
1130 gfs2_holder_uninit(ghs + 2);
1131 gfs2_glock_dq(ghs + 1);
1132 out_child:
1133 gfs2_holder_uninit(ghs + 1);
1134 gfs2_glock_dq(ghs);
1135 out_parent:
1136 gfs2_holder_uninit(ghs);
1137 gfs2_glock_dq_uninit(&ri_gh);
1138 return error;
1139 }
1140
1141 /**
1142 * gfs2_symlink - Create a symlink
1143 * @dir: The directory to create the symlink in
1144 * @dentry: The dentry to put the symlink in
1145 * @symname: The thing which the link points to
1146 *
1147 * Returns: errno
1148 */
1149
1150 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1151 const char *symname)
1152 {
1153 struct gfs2_inode *dip = GFS2_I(dir);
1154 struct gfs2_sbd *sdp = GFS2_SB(dir);
1155 struct gfs2_holder ghs[2];
1156 struct inode *inode;
1157 unsigned int size;
1158
1159 size = strlen(symname);
1160 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1161 return -ENAMETOOLONG;
1162
1163 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
1164
1165 inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0, symname, size);
1166 if (IS_ERR(inode)) {
1167 gfs2_holder_uninit(ghs);
1168 return PTR_ERR(inode);
1169 }
1170
1171 gfs2_trans_end(sdp);
1172 if (dip->i_alloc->al_rgd)
1173 gfs2_inplace_release(dip);
1174 gfs2_quota_unlock(dip);
1175 gfs2_alloc_put(dip);
1176
1177 gfs2_glock_dq_uninit_m(2, ghs);
1178
1179 d_instantiate(dentry, inode);
1180 mark_inode_dirty(inode);
1181
1182 return 0;
1183 }
1184
1185 /**
1186 * gfs2_mkdir - Make a directory
1187 * @dir: The parent directory of the new one
1188 * @dentry: The dentry of the new directory
1189 * @mode: The mode of the new directory
1190 *
1191 * Returns: errno
1192 */
1193
1194 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1195 {
1196 struct gfs2_inode *dip = GFS2_I(dir);
1197 struct gfs2_sbd *sdp = GFS2_SB(dir);
1198 struct gfs2_holder ghs[2];
1199 struct inode *inode;
1200
1201 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
1202
1203 inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0, NULL, 0);
1204 if (IS_ERR(inode)) {
1205 gfs2_holder_uninit(ghs);
1206 return PTR_ERR(inode);
1207 }
1208
1209 gfs2_trans_end(sdp);
1210 if (dip->i_alloc->al_rgd)
1211 gfs2_inplace_release(dip);
1212 gfs2_quota_unlock(dip);
1213 gfs2_alloc_put(dip);
1214
1215 gfs2_glock_dq_uninit_m(2, ghs);
1216
1217 d_instantiate(dentry, inode);
1218 mark_inode_dirty(inode);
1219
1220 return 0;
1221 }
1222
1223 /**
1224 * gfs2_mknod - Make a special file
1225 * @dir: The directory in which the special file will reside
1226 * @dentry: The dentry of the special file
1227 * @mode: The mode of the special file
1228 * @rdev: The device specification of the special file
1229 *
1230 */
1231
1232 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
1233 dev_t dev)
1234 {
1235 struct gfs2_inode *dip = GFS2_I(dir);
1236 struct gfs2_sbd *sdp = GFS2_SB(dir);
1237 struct gfs2_holder ghs[2];
1238 struct inode *inode;
1239
1240 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
1241
1242 inode = gfs2_createi(ghs, &dentry->d_name, mode, dev, NULL, 0);
1243 if (IS_ERR(inode)) {
1244 gfs2_holder_uninit(ghs);
1245 return PTR_ERR(inode);
1246 }
1247
1248 gfs2_trans_end(sdp);
1249 if (dip->i_alloc->al_rgd)
1250 gfs2_inplace_release(dip);
1251 gfs2_quota_unlock(dip);
1252 gfs2_alloc_put(dip);
1253
1254 gfs2_glock_dq_uninit_m(2, ghs);
1255
1256 d_instantiate(dentry, inode);
1257 mark_inode_dirty(inode);
1258
1259 return 0;
1260 }
1261
1262 /*
1263 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1264 * @this: move this
1265 * @to: to here
1266 *
1267 * Follow @to back to the root and make sure we don't encounter @this
1268 * Assumes we already hold the rename lock.
1269 *
1270 * Returns: errno
1271 */
1272
1273 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1274 {
1275 struct inode *dir = &to->i_inode;
1276 struct super_block *sb = dir->i_sb;
1277 struct inode *tmp;
1278 int error = 0;
1279
1280 igrab(dir);
1281
1282 for (;;) {
1283 if (dir == &this->i_inode) {
1284 error = -EINVAL;
1285 break;
1286 }
1287 if (dir == sb->s_root->d_inode) {
1288 error = 0;
1289 break;
1290 }
1291
1292 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1293 if (IS_ERR(tmp)) {
1294 error = PTR_ERR(tmp);
1295 break;
1296 }
1297
1298 iput(dir);
1299 dir = tmp;
1300 }
1301
1302 iput(dir);
1303
1304 return error;
1305 }
1306
1307 /**
1308 * gfs2_rename - Rename a file
1309 * @odir: Parent directory of old file name
1310 * @odentry: The old dentry of the file
1311 * @ndir: Parent directory of new file name
1312 * @ndentry: The new dentry of the file
1313 *
1314 * Returns: errno
1315 */
1316
1317 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1318 struct inode *ndir, struct dentry *ndentry)
1319 {
1320 struct gfs2_inode *odip = GFS2_I(odir);
1321 struct gfs2_inode *ndip = GFS2_I(ndir);
1322 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1323 struct gfs2_inode *nip = NULL;
1324 struct gfs2_sbd *sdp = GFS2_SB(odir);
1325 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }, ri_gh;
1326 struct gfs2_rgrpd *nrgd;
1327 unsigned int num_gh;
1328 int dir_rename = 0;
1329 int alloc_required = 0;
1330 unsigned int x;
1331 int error;
1332
1333 if (ndentry->d_inode) {
1334 nip = GFS2_I(ndentry->d_inode);
1335 if (ip == nip)
1336 return 0;
1337 }
1338
1339 error = gfs2_rindex_hold(sdp, &ri_gh);
1340 if (error)
1341 return error;
1342
1343 if (odip != ndip) {
1344 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1345 0, &r_gh);
1346 if (error)
1347 goto out;
1348
1349 if (S_ISDIR(ip->i_inode.i_mode)) {
1350 dir_rename = 1;
1351 /* don't move a dirctory into it's subdir */
1352 error = gfs2_ok_to_move(ip, ndip);
1353 if (error)
1354 goto out_gunlock_r;
1355 }
1356 }
1357
1358 num_gh = 1;
1359 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1360 if (odip != ndip) {
1361 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1362 num_gh++;
1363 }
1364 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1365 num_gh++;
1366
1367 if (nip) {
1368 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1369 num_gh++;
1370 /* grab the resource lock for unlink flag twiddling
1371 * this is the case of the target file already existing
1372 * so we unlink before doing the rename
1373 */
1374 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
1375 if (nrgd)
1376 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1377 }
1378
1379 for (x = 0; x < num_gh; x++) {
1380 error = gfs2_glock_nq(ghs + x);
1381 if (error)
1382 goto out_gunlock;
1383 }
1384
1385 error = -ENOENT;
1386 if (ip->i_inode.i_nlink == 0)
1387 goto out_gunlock;
1388
1389 /* Check out the old directory */
1390
1391 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1392 if (error)
1393 goto out_gunlock;
1394
1395 /* Check out the new directory */
1396
1397 if (nip) {
1398 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1399 if (error)
1400 goto out_gunlock;
1401
1402 if (nip->i_inode.i_nlink == 0) {
1403 error = -EAGAIN;
1404 goto out_gunlock;
1405 }
1406
1407 if (S_ISDIR(nip->i_inode.i_mode)) {
1408 if (nip->i_entries < 2) {
1409 gfs2_consist_inode(nip);
1410 error = -EIO;
1411 goto out_gunlock;
1412 }
1413 if (nip->i_entries > 2) {
1414 error = -ENOTEMPTY;
1415 goto out_gunlock;
1416 }
1417 }
1418 } else {
1419 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC, 0);
1420 if (error)
1421 goto out_gunlock;
1422
1423 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1424 switch (error) {
1425 case -ENOENT:
1426 error = 0;
1427 break;
1428 case 0:
1429 error = -EEXIST;
1430 default:
1431 goto out_gunlock;
1432 };
1433
1434 if (odip != ndip) {
1435 if (!ndip->i_inode.i_nlink) {
1436 error = -ENOENT;
1437 goto out_gunlock;
1438 }
1439 if (ndip->i_entries == (u32)-1) {
1440 error = -EFBIG;
1441 goto out_gunlock;
1442 }
1443 if (S_ISDIR(ip->i_inode.i_mode) &&
1444 ndip->i_inode.i_nlink == (u32)-1) {
1445 error = -EMLINK;
1446 goto out_gunlock;
1447 }
1448 }
1449 }
1450
1451 /* Check out the dir to be renamed */
1452
1453 if (dir_rename) {
1454 error = gfs2_permission(odentry->d_inode, MAY_WRITE, 0);
1455 if (error)
1456 goto out_gunlock;
1457 }
1458
1459 if (nip == NULL)
1460 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1461 error = alloc_required;
1462 if (error < 0)
1463 goto out_gunlock;
1464 error = 0;
1465
1466 if (alloc_required) {
1467 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
1468 if (!al) {
1469 error = -ENOMEM;
1470 goto out_gunlock;
1471 }
1472
1473 error = gfs2_quota_lock_check(ndip);
1474 if (error)
1475 goto out_alloc;
1476
1477 al->al_requested = sdp->sd_max_dirres;
1478
1479 error = gfs2_inplace_reserve_ri(ndip);
1480 if (error)
1481 goto out_gunlock_q;
1482
1483 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1484 gfs2_rg_blocks(al) +
1485 4 * RES_DINODE + 4 * RES_LEAF +
1486 RES_STATFS + RES_QUOTA + 4, 0);
1487 if (error)
1488 goto out_ipreserv;
1489 } else {
1490 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1491 5 * RES_LEAF + 4, 0);
1492 if (error)
1493 goto out_gunlock;
1494 }
1495
1496 /* Remove the target file, if it exists */
1497
1498 if (nip) {
1499 struct buffer_head *bh;
1500 error = gfs2_meta_inode_buffer(nip, &bh);
1501 if (error)
1502 goto out_end_trans;
1503 error = gfs2_unlink_inode(ndip, ndentry, bh);
1504 brelse(bh);
1505 }
1506
1507 if (dir_rename) {
1508 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1509 if (error)
1510 goto out_end_trans;
1511 } else {
1512 struct buffer_head *dibh;
1513 error = gfs2_meta_inode_buffer(ip, &dibh);
1514 if (error)
1515 goto out_end_trans;
1516 ip->i_inode.i_ctime = CURRENT_TIME;
1517 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1518 gfs2_dinode_out(ip, dibh->b_data);
1519 brelse(dibh);
1520 }
1521
1522 error = gfs2_dir_del(odip, odentry);
1523 if (error)
1524 goto out_end_trans;
1525
1526 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1527 if (error)
1528 goto out_end_trans;
1529
1530 out_end_trans:
1531 gfs2_trans_end(sdp);
1532 out_ipreserv:
1533 if (alloc_required)
1534 gfs2_inplace_release(ndip);
1535 out_gunlock_q:
1536 if (alloc_required)
1537 gfs2_quota_unlock(ndip);
1538 out_alloc:
1539 if (alloc_required)
1540 gfs2_alloc_put(ndip);
1541 out_gunlock:
1542 while (x--) {
1543 gfs2_glock_dq(ghs + x);
1544 gfs2_holder_uninit(ghs + x);
1545 }
1546 out_gunlock_r:
1547 if (r_gh.gh_gl)
1548 gfs2_glock_dq_uninit(&r_gh);
1549 out:
1550 gfs2_glock_dq_uninit(&ri_gh);
1551 return error;
1552 }
1553
1554 /**
1555 * gfs2_follow_link - Follow a symbolic link
1556 * @dentry: The dentry of the link
1557 * @nd: Data that we pass to vfs_follow_link()
1558 *
1559 * This can handle symlinks of any size.
1560 *
1561 * Returns: 0 on success or error code
1562 */
1563
1564 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1565 {
1566 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1567 struct gfs2_holder i_gh;
1568 struct buffer_head *dibh;
1569 unsigned int size;
1570 char *buf;
1571 int error;
1572
1573 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1574 error = gfs2_glock_nq(&i_gh);
1575 if (error) {
1576 gfs2_holder_uninit(&i_gh);
1577 nd_set_link(nd, ERR_PTR(error));
1578 return NULL;
1579 }
1580
1581 size = (unsigned int)i_size_read(&ip->i_inode);
1582 if (size == 0) {
1583 gfs2_consist_inode(ip);
1584 buf = ERR_PTR(-EIO);
1585 goto out;
1586 }
1587
1588 error = gfs2_meta_inode_buffer(ip, &dibh);
1589 if (error) {
1590 buf = ERR_PTR(error);
1591 goto out;
1592 }
1593
1594 buf = kzalloc(size + 1, GFP_NOFS);
1595 if (!buf)
1596 buf = ERR_PTR(-ENOMEM);
1597 else
1598 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1599 brelse(dibh);
1600 out:
1601 gfs2_glock_dq_uninit(&i_gh);
1602 nd_set_link(nd, buf);
1603 return NULL;
1604 }
1605
1606 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1607 {
1608 char *s = nd_get_link(nd);
1609 if (!IS_ERR(s))
1610 kfree(s);
1611 }
1612
1613 /**
1614 * gfs2_permission -
1615 * @inode: The inode
1616 * @mask: The mask to be tested
1617 * @flags: Indicates whether this is an RCU path walk or not
1618 *
1619 * This may be called from the VFS directly, or from within GFS2 with the
1620 * inode locked, so we look to see if the glock is already locked and only
1621 * lock the glock if its not already been done.
1622 *
1623 * Returns: errno
1624 */
1625
1626 int gfs2_permission(struct inode *inode, int mask, unsigned int flags)
1627 {
1628 struct gfs2_inode *ip;
1629 struct gfs2_holder i_gh;
1630 int error;
1631 int unlock = 0;
1632
1633
1634 ip = GFS2_I(inode);
1635 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1636 if (flags & IPERM_FLAG_RCU)
1637 return -ECHILD;
1638 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1639 if (error)
1640 return error;
1641 unlock = 1;
1642 }
1643
1644 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1645 error = -EACCES;
1646 else
1647 error = generic_permission(inode, mask, flags, gfs2_check_acl);
1648 if (unlock)
1649 gfs2_glock_dq_uninit(&i_gh);
1650
1651 return error;
1652 }
1653
1654 static int __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1655 {
1656 struct inode *inode = &ip->i_inode;
1657 struct buffer_head *dibh;
1658 int error;
1659
1660 error = gfs2_meta_inode_buffer(ip, &dibh);
1661 if (error)
1662 return error;
1663
1664 setattr_copy(inode, attr);
1665 mark_inode_dirty(inode);
1666 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1667 gfs2_dinode_out(ip, dibh->b_data);
1668 brelse(dibh);
1669 return 0;
1670 }
1671
1672 /**
1673 * gfs2_setattr_simple -
1674 * @ip:
1675 * @attr:
1676 *
1677 * Returns: errno
1678 */
1679
1680 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1681 {
1682 int error;
1683
1684 if (current->journal_info)
1685 return __gfs2_setattr_simple(ip, attr);
1686
1687 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1688 if (error)
1689 return error;
1690
1691 error = __gfs2_setattr_simple(ip, attr);
1692 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1693 return error;
1694 }
1695
1696 static int setattr_chown(struct inode *inode, struct iattr *attr)
1697 {
1698 struct gfs2_inode *ip = GFS2_I(inode);
1699 struct gfs2_sbd *sdp = GFS2_SB(inode);
1700 u32 ouid, ogid, nuid, ngid;
1701 int error;
1702
1703 ouid = inode->i_uid;
1704 ogid = inode->i_gid;
1705 nuid = attr->ia_uid;
1706 ngid = attr->ia_gid;
1707
1708 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1709 ouid = nuid = NO_QUOTA_CHANGE;
1710 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1711 ogid = ngid = NO_QUOTA_CHANGE;
1712
1713 if (!gfs2_alloc_get(ip))
1714 return -ENOMEM;
1715
1716 error = gfs2_quota_lock(ip, nuid, ngid);
1717 if (error)
1718 goto out_alloc;
1719
1720 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1721 error = gfs2_quota_check(ip, nuid, ngid);
1722 if (error)
1723 goto out_gunlock_q;
1724 }
1725
1726 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1727 if (error)
1728 goto out_gunlock_q;
1729
1730 error = gfs2_setattr_simple(ip, attr);
1731 if (error)
1732 goto out_end_trans;
1733
1734 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1735 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1736 gfs2_quota_change(ip, -blocks, ouid, ogid);
1737 gfs2_quota_change(ip, blocks, nuid, ngid);
1738 }
1739
1740 out_end_trans:
1741 gfs2_trans_end(sdp);
1742 out_gunlock_q:
1743 gfs2_quota_unlock(ip);
1744 out_alloc:
1745 gfs2_alloc_put(ip);
1746 return error;
1747 }
1748
1749 /**
1750 * gfs2_setattr - Change attributes on an inode
1751 * @dentry: The dentry which is changing
1752 * @attr: The structure describing the change
1753 *
1754 * The VFS layer wants to change one or more of an inodes attributes. Write
1755 * that change out to disk.
1756 *
1757 * Returns: errno
1758 */
1759
1760 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1761 {
1762 struct inode *inode = dentry->d_inode;
1763 struct gfs2_inode *ip = GFS2_I(inode);
1764 struct gfs2_holder i_gh;
1765 int error;
1766
1767 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1768 if (error)
1769 return error;
1770
1771 error = -EPERM;
1772 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1773 goto out;
1774
1775 error = inode_change_ok(inode, attr);
1776 if (error)
1777 goto out;
1778
1779 if (attr->ia_valid & ATTR_SIZE)
1780 error = gfs2_setattr_size(inode, attr->ia_size);
1781 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1782 error = setattr_chown(inode, attr);
1783 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1784 error = gfs2_acl_chmod(ip, attr);
1785 else
1786 error = gfs2_setattr_simple(ip, attr);
1787
1788 out:
1789 gfs2_glock_dq_uninit(&i_gh);
1790 if (!error)
1791 mark_inode_dirty(inode);
1792 return error;
1793 }
1794
1795 /**
1796 * gfs2_getattr - Read out an inode's attributes
1797 * @mnt: The vfsmount the inode is being accessed from
1798 * @dentry: The dentry to stat
1799 * @stat: The inode's stats
1800 *
1801 * This may be called from the VFS directly, or from within GFS2 with the
1802 * inode locked, so we look to see if the glock is already locked and only
1803 * lock the glock if its not already been done. Note that its the NFS
1804 * readdirplus operation which causes this to be called (from filldir)
1805 * with the glock already held.
1806 *
1807 * Returns: errno
1808 */
1809
1810 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1811 struct kstat *stat)
1812 {
1813 struct inode *inode = dentry->d_inode;
1814 struct gfs2_inode *ip = GFS2_I(inode);
1815 struct gfs2_holder gh;
1816 int error;
1817 int unlock = 0;
1818
1819 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1820 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1821 if (error)
1822 return error;
1823 unlock = 1;
1824 }
1825
1826 generic_fillattr(inode, stat);
1827 if (unlock)
1828 gfs2_glock_dq_uninit(&gh);
1829
1830 return 0;
1831 }
1832
1833 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1834 const void *data, size_t size, int flags)
1835 {
1836 struct inode *inode = dentry->d_inode;
1837 struct gfs2_inode *ip = GFS2_I(inode);
1838 struct gfs2_holder gh;
1839 int ret;
1840
1841 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1842 ret = gfs2_glock_nq(&gh);
1843 if (ret == 0) {
1844 ret = generic_setxattr(dentry, name, data, size, flags);
1845 gfs2_glock_dq(&gh);
1846 }
1847 gfs2_holder_uninit(&gh);
1848 return ret;
1849 }
1850
1851 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1852 void *data, size_t size)
1853 {
1854 struct inode *inode = dentry->d_inode;
1855 struct gfs2_inode *ip = GFS2_I(inode);
1856 struct gfs2_holder gh;
1857 int ret;
1858
1859 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1860 ret = gfs2_glock_nq(&gh);
1861 if (ret == 0) {
1862 ret = generic_getxattr(dentry, name, data, size);
1863 gfs2_glock_dq(&gh);
1864 }
1865 gfs2_holder_uninit(&gh);
1866 return ret;
1867 }
1868
1869 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1870 {
1871 struct inode *inode = dentry->d_inode;
1872 struct gfs2_inode *ip = GFS2_I(inode);
1873 struct gfs2_holder gh;
1874 int ret;
1875
1876 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1877 ret = gfs2_glock_nq(&gh);
1878 if (ret == 0) {
1879 ret = generic_removexattr(dentry, name);
1880 gfs2_glock_dq(&gh);
1881 }
1882 gfs2_holder_uninit(&gh);
1883 return ret;
1884 }
1885
1886 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1887 u64 start, u64 len)
1888 {
1889 struct gfs2_inode *ip = GFS2_I(inode);
1890 struct gfs2_holder gh;
1891 int ret;
1892
1893 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1894 if (ret)
1895 return ret;
1896
1897 mutex_lock(&inode->i_mutex);
1898
1899 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1900 if (ret)
1901 goto out;
1902
1903 if (gfs2_is_stuffed(ip)) {
1904 u64 phys = ip->i_no_addr << inode->i_blkbits;
1905 u64 size = i_size_read(inode);
1906 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1907 FIEMAP_EXTENT_DATA_INLINE;
1908 phys += sizeof(struct gfs2_dinode);
1909 phys += start;
1910 if (start + len > size)
1911 len = size - start;
1912 if (start < size)
1913 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1914 len, flags);
1915 if (ret == 1)
1916 ret = 0;
1917 } else {
1918 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1919 gfs2_block_map);
1920 }
1921
1922 gfs2_glock_dq_uninit(&gh);
1923 out:
1924 mutex_unlock(&inode->i_mutex);
1925 return ret;
1926 }
1927
1928 const struct inode_operations gfs2_file_iops = {
1929 .permission = gfs2_permission,
1930 .setattr = gfs2_setattr,
1931 .getattr = gfs2_getattr,
1932 .setxattr = gfs2_setxattr,
1933 .getxattr = gfs2_getxattr,
1934 .listxattr = gfs2_listxattr,
1935 .removexattr = gfs2_removexattr,
1936 .fiemap = gfs2_fiemap,
1937 };
1938
1939 const struct inode_operations gfs2_dir_iops = {
1940 .create = gfs2_create,
1941 .lookup = gfs2_lookup,
1942 .link = gfs2_link,
1943 .unlink = gfs2_unlink,
1944 .symlink = gfs2_symlink,
1945 .mkdir = gfs2_mkdir,
1946 .rmdir = gfs2_unlink,
1947 .mknod = gfs2_mknod,
1948 .rename = gfs2_rename,
1949 .permission = gfs2_permission,
1950 .setattr = gfs2_setattr,
1951 .getattr = gfs2_getattr,
1952 .setxattr = gfs2_setxattr,
1953 .getxattr = gfs2_getxattr,
1954 .listxattr = gfs2_listxattr,
1955 .removexattr = gfs2_removexattr,
1956 .fiemap = gfs2_fiemap,
1957 };
1958
1959 const struct inode_operations gfs2_symlink_iops = {
1960 .readlink = generic_readlink,
1961 .follow_link = gfs2_follow_link,
1962 .put_link = gfs2_put_link,
1963 .permission = gfs2_permission,
1964 .setattr = gfs2_setattr,
1965 .getattr = gfs2_getattr,
1966 .setxattr = gfs2_setxattr,
1967 .getxattr = gfs2_getxattr,
1968 .listxattr = gfs2_listxattr,
1969 .removexattr = gfs2_removexattr,
1970 .fiemap = gfs2_fiemap,
1971 };
1972
Linux kernel - Deliverables
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