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bug: introduce BUILD_BUG_ON_INVALID() macro
[linux/fpc-iii.git] / fs / gfs2 / inode.c
bloba9ba2444e077ac145f23c25161038a0f8ac2f468
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10 #include <linux/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/namei.h>
15 #include <linux/mm.h>
16 #include <linux/xattr.h>
17 #include <linux/posix_acl.h>
18 #include <linux/gfs2_ondisk.h>
19 #include <linux/crc32.h>
20 #include <linux/fiemap.h>
21 #include <linux/security.h>
22 #include <asm/uaccess.h>
23
24 #include "gfs2.h"
25 #include "incore.h"
26 #include "acl.h"
27 #include "bmap.h"
28 #include "dir.h"
29 #include "xattr.h"
30 #include "glock.h"
31 #include "inode.h"
32 #include "meta_io.h"
33 #include "quota.h"
34 #include "rgrp.h"
35 #include "trans.h"
36 #include "util.h"
37 #include "super.h"
38 #include "glops.h"
39
40 struct gfs2_skip_data {
41 u64 no_addr;
42 int skipped;
43 int non_block;
44 };
45
46 static int iget_test(struct inode *inode, void *opaque)
47 {
48 struct gfs2_inode *ip = GFS2_I(inode);
49 struct gfs2_skip_data *data = opaque;
50
51 if (ip->i_no_addr == data->no_addr) {
52 if (data->non_block &&
53 inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
54 data->skipped = 1;
55 return 0;
56 }
57 return 1;
58 }
59 return 0;
60 }
61
62 static int iget_set(struct inode *inode, void *opaque)
63 {
64 struct gfs2_inode *ip = GFS2_I(inode);
65 struct gfs2_skip_data *data = opaque;
66
67 if (data->skipped)
68 return -ENOENT;
69 inode->i_ino = (unsigned long)(data->no_addr);
70 ip->i_no_addr = data->no_addr;
71 return 0;
72 }
73
74 struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block)
75 {
76 unsigned long hash = (unsigned long)no_addr;
77 struct gfs2_skip_data data;
78
79 data.no_addr = no_addr;
80 data.skipped = 0;
81 data.non_block = non_block;
82 return ilookup5(sb, hash, iget_test, &data);
83 }
84
85 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr,
86 int non_block)
87 {
88 struct gfs2_skip_data data;
89 unsigned long hash = (unsigned long)no_addr;
90
91 data.no_addr = no_addr;
92 data.skipped = 0;
93 data.non_block = non_block;
94 return iget5_locked(sb, hash, iget_test, iget_set, &data);
95 }
96
97 /**
98 * gfs2_set_iop - Sets inode operations
99 * @inode: The inode with correct i_mode filled in
100 *
101 * GFS2 lookup code fills in vfs inode contents based on info obtained
102 * from directory entry inside gfs2_inode_lookup().
103 */
104
105 static void gfs2_set_iop(struct inode *inode)
106 {
107 struct gfs2_sbd *sdp = GFS2_SB(inode);
108 umode_t mode = inode->i_mode;
109
110 if (S_ISREG(mode)) {
111 inode->i_op = &gfs2_file_iops;
112 if (gfs2_localflocks(sdp))
113 inode->i_fop = &gfs2_file_fops_nolock;
114 else
115 inode->i_fop = &gfs2_file_fops;
116 } else if (S_ISDIR(mode)) {
117 inode->i_op = &gfs2_dir_iops;
118 if (gfs2_localflocks(sdp))
119 inode->i_fop = &gfs2_dir_fops_nolock;
120 else
121 inode->i_fop = &gfs2_dir_fops;
122 } else if (S_ISLNK(mode)) {
123 inode->i_op = &gfs2_symlink_iops;
124 } else {
125 inode->i_op = &gfs2_file_iops;
126 init_special_inode(inode, inode->i_mode, inode->i_rdev);
127 }
128 }
129
130 /**
131 * gfs2_inode_lookup - Lookup an inode
132 * @sb: The super block
133 * @no_addr: The inode number
134 * @type: The type of the inode
135 * non_block: Can we block on inodes that are being freed?
136 *
137 * Returns: A VFS inode, or an error
138 */
139
140 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
141 u64 no_addr, u64 no_formal_ino, int non_block)
142 {
143 struct inode *inode;
144 struct gfs2_inode *ip;
145 struct gfs2_glock *io_gl = NULL;
146 int error;
147
148 inode = gfs2_iget(sb, no_addr, non_block);
149 ip = GFS2_I(inode);
150
151 if (!inode)
152 return ERR_PTR(-ENOBUFS);
153
154 if (inode->i_state & I_NEW) {
155 struct gfs2_sbd *sdp = GFS2_SB(inode);
156 ip->i_no_formal_ino = no_formal_ino;
157
158 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
159 if (unlikely(error))
160 goto fail;
161 ip->i_gl->gl_object = ip;
162
163 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
164 if (unlikely(error))
165 goto fail_put;
166
167 set_bit(GIF_INVALID, &ip->i_flags);
168 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
169 if (unlikely(error))
170 goto fail_iopen;
171
172 ip->i_iopen_gh.gh_gl->gl_object = ip;
173 gfs2_glock_put(io_gl);
174 io_gl = NULL;
175
176 if (type == DT_UNKNOWN) {
177 /* Inode glock must be locked already */
178 error = gfs2_inode_refresh(GFS2_I(inode));
179 if (error)
180 goto fail_refresh;
181 } else {
182 inode->i_mode = DT2IF(type);
183 }
184
185 gfs2_set_iop(inode);
186 unlock_new_inode(inode);
187 }
188
189 return inode;
190
191 fail_refresh:
192 ip->i_iopen_gh.gh_gl->gl_object = NULL;
193 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
194 fail_iopen:
195 if (io_gl)
196 gfs2_glock_put(io_gl);
197 fail_put:
198 ip->i_gl->gl_object = NULL;
199 gfs2_glock_put(ip->i_gl);
200 fail:
201 iget_failed(inode);
202 return ERR_PTR(error);
203 }
204
205 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
206 u64 *no_formal_ino, unsigned int blktype)
207 {
208 struct super_block *sb = sdp->sd_vfs;
209 struct gfs2_holder i_gh;
210 struct inode *inode = NULL;
211 int error;
212
213 /* Must not read in block until block type is verified */
214 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
215 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
216 if (error)
217 return ERR_PTR(error);
218
219 error = gfs2_check_blk_type(sdp, no_addr, blktype);
220 if (error)
221 goto fail;
222
223 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
224 if (IS_ERR(inode))
225 goto fail;
226
227 /* Two extra checks for NFS only */
228 if (no_formal_ino) {
229 error = -ESTALE;
230 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
231 goto fail_iput;
232
233 error = -EIO;
234 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
235 goto fail_iput;
236
237 error = 0;
238 }
239
240 fail:
241 gfs2_glock_dq_uninit(&i_gh);
242 return error ? ERR_PTR(error) : inode;
243 fail_iput:
244 iput(inode);
245 goto fail;
246 }
247
248
249 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
250 {
251 struct qstr qstr;
252 struct inode *inode;
253 gfs2_str2qstr(&qstr, name);
254 inode = gfs2_lookupi(dip, &qstr, 1);
255 /* gfs2_lookupi has inconsistent callers: vfs
256 * related routines expect NULL for no entry found,
257 * gfs2_lookup_simple callers expect ENOENT
258 * and do not check for NULL.
259 */
260 if (inode == NULL)
261 return ERR_PTR(-ENOENT);
262 else
263 return inode;
264 }
265
266
267 /**
268 * gfs2_lookupi - Look up a filename in a directory and return its inode
269 * @d_gh: An initialized holder for the directory glock
270 * @name: The name of the inode to look for
271 * @is_root: If 1, ignore the caller's permissions
272 * @i_gh: An uninitialized holder for the new inode glock
273 *
274 * This can be called via the VFS filldir function when NFS is doing
275 * a readdirplus and the inode which its intending to stat isn't
276 * already in cache. In this case we must not take the directory glock
277 * again, since the readdir call will have already taken that lock.
278 *
279 * Returns: errno
280 */
281
282 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
283 int is_root)
284 {
285 struct super_block *sb = dir->i_sb;
286 struct gfs2_inode *dip = GFS2_I(dir);
287 struct gfs2_holder d_gh;
288 int error = 0;
289 struct inode *inode = NULL;
290 int unlock = 0;
291
292 if (!name->len || name->len > GFS2_FNAMESIZE)
293 return ERR_PTR(-ENAMETOOLONG);
294
295 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
296 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
297 dir == sb->s_root->d_inode)) {
298 igrab(dir);
299 return dir;
300 }
301
302 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
303 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
304 if (error)
305 return ERR_PTR(error);
306 unlock = 1;
307 }
308
309 if (!is_root) {
310 error = gfs2_permission(dir, MAY_EXEC);
311 if (error)
312 goto out;
313 }
314
315 inode = gfs2_dir_search(dir, name);
316 if (IS_ERR(inode))
317 error = PTR_ERR(inode);
318 out:
319 if (unlock)
320 gfs2_glock_dq_uninit(&d_gh);
321 if (error == -ENOENT)
322 return NULL;
323 return inode ? inode : ERR_PTR(error);
324 }
325
326 /**
327 * create_ok - OK to create a new on-disk inode here?
328 * @dip: Directory in which dinode is to be created
329 * @name: Name of new dinode
330 * @mode:
331 *
332 * Returns: errno
333 */
334
335 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
336 umode_t mode)
337 {
338 int error;
339
340 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
341 if (error)
342 return error;
343
344 /* Don't create entries in an unlinked directory */
345 if (!dip->i_inode.i_nlink)
346 return -ENOENT;
347
348 error = gfs2_dir_check(&dip->i_inode, name, NULL);
349 switch (error) {
350 case -ENOENT:
351 error = 0;
352 break;
353 case 0:
354 return -EEXIST;
355 default:
356 return error;
357 }
358
359 if (dip->i_entries == (u32)-1)
360 return -EFBIG;
361 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
362 return -EMLINK;
363
364 return 0;
365 }
366
367 static void munge_mode_uid_gid(struct gfs2_inode *dip, umode_t *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 int dblocks = 1;
393
394 error = gfs2_inplace_reserve(dip, RES_DINODE);
395 if (error)
396 goto out;
397
398 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
399 if (error)
400 goto out_ipreserv;
401
402 error = gfs2_alloc_blocks(dip, no_addr, &dblocks, 1, generation);
403
404 gfs2_trans_end(sdp);
405
406 out_ipreserv:
407 gfs2_inplace_release(dip);
408 out:
409 return error;
410 }
411
412 static void gfs2_init_dir(struct buffer_head *dibh,
413 const struct gfs2_inode *parent)
414 {
415 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
416 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
417
418 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
419 dent->de_inum = di->di_num; /* already GFS2 endian */
420 dent->de_type = cpu_to_be16(DT_DIR);
421
422 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
423 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
424 gfs2_inum_out(parent, dent);
425 dent->de_type = cpu_to_be16(DT_DIR);
426
427 }
428
429 /**
430 * init_dinode - Fill in a new dinode structure
431 * @dip: The directory this inode is being created in
432 * @gl: The glock covering the new inode
433 * @inum: The inode number
434 * @mode: The file permissions
435 * @uid: The uid of the new inode
436 * @gid: The gid of the new inode
437 * @generation: The generation number of the new inode
438 * @dev: The device number (if a device node)
439 * @symname: The symlink destination (if a symlink)
440 * @size: The inode size (ignored for directories)
441 * @bhp: The buffer head (returned to caller)
442 *
443 */
444
445 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
446 const struct gfs2_inum_host *inum, umode_t mode,
447 unsigned int uid, unsigned int gid,
448 const u64 *generation, dev_t dev, const char *symname,
449 unsigned size, struct buffer_head **bhp)
450 {
451 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
452 struct gfs2_dinode *di;
453 struct buffer_head *dibh;
454 struct timespec tv = CURRENT_TIME;
455
456 dibh = gfs2_meta_new(gl, inum->no_addr);
457 gfs2_trans_add_bh(gl, dibh, 1);
458 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
459 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
460 di = (struct gfs2_dinode *)dibh->b_data;
461
462 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
463 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
464 di->di_mode = cpu_to_be32(mode);
465 di->di_uid = cpu_to_be32(uid);
466 di->di_gid = cpu_to_be32(gid);
467 di->di_nlink = 0;
468 di->di_size = cpu_to_be64(size);
469 di->di_blocks = cpu_to_be64(1);
470 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec);
471 di->di_major = cpu_to_be32(MAJOR(dev));
472 di->di_minor = cpu_to_be32(MINOR(dev));
473 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
474 di->di_generation = cpu_to_be64(*generation);
475 di->di_flags = 0;
476 di->__pad1 = 0;
477 di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
478 di->di_height = 0;
479 di->__pad2 = 0;
480 di->__pad3 = 0;
481 di->di_depth = 0;
482 di->di_entries = 0;
483 memset(&di->__pad4, 0, sizeof(di->__pad4));
484 di->di_eattr = 0;
485 di->di_atime_nsec = cpu_to_be32(tv.tv_nsec);
486 di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec);
487 di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec);
488 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
489
490 switch(mode & S_IFMT) {
491 case S_IFREG:
492 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
493 gfs2_tune_get(sdp, gt_new_files_jdata))
494 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
495 break;
496 case S_IFDIR:
497 di->di_flags |= cpu_to_be32(dip->i_diskflags &
498 GFS2_DIF_INHERIT_JDATA);
499 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
500 di->di_size = cpu_to_be64(sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode));
501 di->di_entries = cpu_to_be32(2);
502 gfs2_init_dir(dibh, dip);
503 break;
504 case S_IFLNK:
505 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, size);
506 break;
507 }
508
509 set_buffer_uptodate(dibh);
510
511 *bhp = dibh;
512 }
513
514 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
515 umode_t mode, const struct gfs2_inum_host *inum,
516 const u64 *generation, dev_t dev, const char *symname,
517 unsigned int size, struct buffer_head **bhp)
518 {
519 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
520 unsigned int uid, gid;
521 int error;
522
523 munge_mode_uid_gid(dip, &mode, &uid, &gid);
524 if (!gfs2_qadata_get(dip))
525 return -ENOMEM;
526
527 error = gfs2_quota_lock(dip, uid, gid);
528 if (error)
529 goto out;
530
531 error = gfs2_quota_check(dip, uid, gid);
532 if (error)
533 goto out_quota;
534
535 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
536 if (error)
537 goto out_quota;
538
539 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, symname, size, bhp);
540 gfs2_quota_change(dip, +1, uid, gid);
541 gfs2_trans_end(sdp);
542
543 out_quota:
544 gfs2_quota_unlock(dip);
545 out:
546 gfs2_qadata_put(dip);
547 return error;
548 }
549
550 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
551 struct gfs2_inode *ip)
552 {
553 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
554 struct gfs2_qadata *qa;
555 int alloc_required;
556 struct buffer_head *dibh;
557 int error;
558
559 qa = gfs2_qadata_get(dip);
560 if (!qa)
561 return -ENOMEM;
562
563 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
564 if (error)
565 goto fail;
566
567 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
568 if (alloc_required < 0)
569 goto fail_quota_locks;
570 if (alloc_required) {
571 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
572 if (error)
573 goto fail_quota_locks;
574
575 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres);
576 if (error)
577 goto fail_quota_locks;
578
579 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
580 dip->i_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 set_nlink(&ip->i_inode, S_ISDIR(ip->i_inode.i_mode) ? 2 : 1);
599 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
600 gfs2_dinode_out(ip, dibh->b_data);
601 brelse(dibh);
602 return 0;
603
604 fail_end_trans:
605 gfs2_trans_end(sdp);
606
607 fail_ipreserv:
608 gfs2_inplace_release(dip);
609
610 fail_quota_locks:
611 gfs2_quota_unlock(dip);
612
613 fail:
614 gfs2_qadata_put(dip);
615 return error;
616 }
617
618 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
619 void *fs_info)
620 {
621 const struct xattr *xattr;
622 int err = 0;
623
624 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
625 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
626 xattr->value_len, 0,
627 GFS2_EATYPE_SECURITY);
628 if (err < 0)
629 break;
630 }
631 return err;
632 }
633
634 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
635 const struct qstr *qstr)
636 {
637 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
638 &gfs2_initxattrs, NULL);
639 }
640
641 /**
642 * gfs2_create_inode - Create a new inode
643 * @dir: The parent directory
644 * @dentry: The new dentry
645 * @mode: The permissions on the new inode
646 * @dev: For device nodes, this is the device number
647 * @symname: For symlinks, this is the link destination
648 * @size: The initial size of the inode (ignored for directories)
649 *
650 * Returns: 0 on success, or error code
651 */
652
653 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
654 umode_t mode, dev_t dev, const char *symname,
655 unsigned int size, int excl)
656 {
657 const struct qstr *name = &dentry->d_name;
658 struct gfs2_holder ghs[2];
659 struct inode *inode = NULL;
660 struct gfs2_inode *dip = GFS2_I(dir);
661 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
662 struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
663 int error;
664 u64 generation;
665 struct buffer_head *bh = NULL;
666
667 if (!name->len || name->len > GFS2_FNAMESIZE)
668 return -ENAMETOOLONG;
669
670 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
671 if (error)
672 goto fail;
673
674 error = create_ok(dip, name, mode);
675 if ((error == -EEXIST) && S_ISREG(mode) && !excl) {
676 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
677 gfs2_glock_dq_uninit(ghs);
678 d_instantiate(dentry, inode);
679 return IS_ERR(inode) ? PTR_ERR(inode) : 0;
680 }
681 if (error)
682 goto fail_gunlock;
683
684 error = alloc_dinode(dip, &inum.no_addr, &generation);
685 if (error)
686 goto fail_gunlock;
687 inum.no_formal_ino = generation;
688
689 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
690 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
691 if (error)
692 goto fail_gunlock;
693
694 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, symname, size, &bh);
695 if (error)
696 goto fail_gunlock2;
697
698 inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr,
699 inum.no_formal_ino, 0);
700 if (IS_ERR(inode))
701 goto fail_gunlock2;
702
703 error = gfs2_inode_refresh(GFS2_I(inode));
704 if (error)
705 goto fail_gunlock2;
706
707 error = gfs2_acl_create(dip, inode);
708 if (error)
709 goto fail_gunlock2;
710
711 error = gfs2_security_init(dip, GFS2_I(inode), name);
712 if (error)
713 goto fail_gunlock2;
714
715 error = link_dinode(dip, name, GFS2_I(inode));
716 if (error)
717 goto fail_gunlock2;
718
719 if (bh)
720 brelse(bh);
721
722 gfs2_trans_end(sdp);
723 /* Check if we reserved space in the rgrp. Function link_dinode may
724 not, depending on whether alloc is required. */
725 if (dip->i_res)
726 gfs2_inplace_release(dip);
727 gfs2_quota_unlock(dip);
728 gfs2_qadata_put(dip);
729 mark_inode_dirty(inode);
730 gfs2_glock_dq_uninit_m(2, ghs);
731 d_instantiate(dentry, inode);
732 return 0;
733
734 fail_gunlock2:
735 gfs2_glock_dq_uninit(ghs + 1);
736 fail_gunlock:
737 gfs2_glock_dq_uninit(ghs);
738 if (inode && !IS_ERR(inode)) {
739 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags);
740 iput(inode);
741 }
742 fail:
743 if (bh)
744 brelse(bh);
745 return error;
746 }
747
748 /**
749 * gfs2_create - Create a file
750 * @dir: The directory in which to create the file
751 * @dentry: The dentry of the new file
752 * @mode: The mode of the new file
753 *
754 * Returns: errno
755 */
756
757 static int gfs2_create(struct inode *dir, struct dentry *dentry,
758 umode_t mode, struct nameidata *nd)
759 {
760 int excl = 0;
761 if (nd && (nd->flags & LOOKUP_EXCL))
762 excl = 1;
763 return gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0, excl);
764 }
765
766 /**
767 * gfs2_lookup - Look up a filename in a directory and return its inode
768 * @dir: The directory inode
769 * @dentry: The dentry of the new inode
770 * @nd: passed from Linux VFS, ignored by us
771 *
772 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
773 *
774 * Returns: errno
775 */
776
777 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
778 struct nameidata *nd)
779 {
780 struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0);
781 if (inode && !IS_ERR(inode)) {
782 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
783 struct gfs2_holder gh;
784 int error;
785 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
786 if (error) {
787 iput(inode);
788 return ERR_PTR(error);
789 }
790 gfs2_glock_dq_uninit(&gh);
791 }
792 return d_splice_alias(inode, dentry);
793 }
794
795 /**
796 * gfs2_link - Link to a file
797 * @old_dentry: The inode to link
798 * @dir: Add link to this directory
799 * @dentry: The name of the link
800 *
801 * Link the inode in "old_dentry" into the directory "dir" with the
802 * name in "dentry".
803 *
804 * Returns: errno
805 */
806
807 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
808 struct dentry *dentry)
809 {
810 struct gfs2_inode *dip = GFS2_I(dir);
811 struct gfs2_sbd *sdp = GFS2_SB(dir);
812 struct inode *inode = old_dentry->d_inode;
813 struct gfs2_inode *ip = GFS2_I(inode);
814 struct gfs2_holder ghs[2];
815 struct buffer_head *dibh;
816 int alloc_required;
817 int error;
818
819 if (S_ISDIR(inode->i_mode))
820 return -EPERM;
821
822 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
823 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
824
825 error = gfs2_glock_nq(ghs); /* parent */
826 if (error)
827 goto out_parent;
828
829 error = gfs2_glock_nq(ghs + 1); /* child */
830 if (error)
831 goto out_child;
832
833 error = -ENOENT;
834 if (inode->i_nlink == 0)
835 goto out_gunlock;
836
837 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
838 if (error)
839 goto out_gunlock;
840
841 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
842 switch (error) {
843 case -ENOENT:
844 break;
845 case 0:
846 error = -EEXIST;
847 default:
848 goto out_gunlock;
849 }
850
851 error = -EINVAL;
852 if (!dip->i_inode.i_nlink)
853 goto out_gunlock;
854 error = -EFBIG;
855 if (dip->i_entries == (u32)-1)
856 goto out_gunlock;
857 error = -EPERM;
858 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
859 goto out_gunlock;
860 error = -EINVAL;
861 if (!ip->i_inode.i_nlink)
862 goto out_gunlock;
863 error = -EMLINK;
864 if (ip->i_inode.i_nlink == (u32)-1)
865 goto out_gunlock;
866
867 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
868 if (error < 0)
869 goto out_gunlock;
870 error = 0;
871
872 if (alloc_required) {
873 struct gfs2_qadata *qa = gfs2_qadata_get(dip);
874
875 if (!qa) {
876 error = -ENOMEM;
877 goto out_gunlock;
878 }
879
880 error = gfs2_quota_lock_check(dip);
881 if (error)
882 goto out_alloc;
883
884 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres);
885 if (error)
886 goto out_gunlock_q;
887
888 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
889 gfs2_rg_blocks(dip) +
890 2 * RES_DINODE + RES_STATFS +
891 RES_QUOTA, 0);
892 if (error)
893 goto out_ipres;
894 } else {
895 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
896 if (error)
897 goto out_ipres;
898 }
899
900 error = gfs2_meta_inode_buffer(ip, &dibh);
901 if (error)
902 goto out_end_trans;
903
904 error = gfs2_dir_add(dir, &dentry->d_name, ip);
905 if (error)
906 goto out_brelse;
907
908 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
909 inc_nlink(&ip->i_inode);
910 ip->i_inode.i_ctime = CURRENT_TIME;
911 ihold(inode);
912 d_instantiate(dentry, inode);
913 mark_inode_dirty(inode);
914
915 out_brelse:
916 brelse(dibh);
917 out_end_trans:
918 gfs2_trans_end(sdp);
919 out_ipres:
920 if (alloc_required)
921 gfs2_inplace_release(dip);
922 out_gunlock_q:
923 if (alloc_required)
924 gfs2_quota_unlock(dip);
925 out_alloc:
926 if (alloc_required)
927 gfs2_qadata_put(dip);
928 out_gunlock:
929 gfs2_glock_dq(ghs + 1);
930 out_child:
931 gfs2_glock_dq(ghs);
932 out_parent:
933 gfs2_holder_uninit(ghs);
934 gfs2_holder_uninit(ghs + 1);
935 return error;
936 }
937
938 /*
939 * gfs2_unlink_ok - check to see that a inode is still in a directory
940 * @dip: the directory
941 * @name: the name of the file
942 * @ip: the inode
943 *
944 * Assumes that the lock on (at least) @dip is held.
945 *
946 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
947 */
948
949 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
950 const struct gfs2_inode *ip)
951 {
952 int error;
953
954 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
955 return -EPERM;
956
957 if ((dip->i_inode.i_mode & S_ISVTX) &&
958 dip->i_inode.i_uid != current_fsuid() &&
959 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
960 return -EPERM;
961
962 if (IS_APPEND(&dip->i_inode))
963 return -EPERM;
964
965 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
966 if (error)
967 return error;
968
969 error = gfs2_dir_check(&dip->i_inode, name, ip);
970 if (error)
971 return error;
972
973 return 0;
974 }
975
976 /**
977 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
978 * @dip: The parent directory
979 * @name: The name of the entry in the parent directory
980 * @bh: The inode buffer for the inode to be removed
981 * @inode: The inode to be removed
982 *
983 * Called with all the locks and in a transaction. This will only be
984 * called for a directory after it has been checked to ensure it is empty.
985 *
986 * Returns: 0 on success, or an error
987 */
988
989 static int gfs2_unlink_inode(struct gfs2_inode *dip,
990 const struct dentry *dentry,
991 struct buffer_head *bh)
992 {
993 struct inode *inode = dentry->d_inode;
994 struct gfs2_inode *ip = GFS2_I(inode);
995 int error;
996
997 error = gfs2_dir_del(dip, dentry);
998 if (error)
999 return error;
1000
1001 ip->i_entries = 0;
1002 inode->i_ctime = CURRENT_TIME;
1003 if (S_ISDIR(inode->i_mode))
1004 clear_nlink(inode);
1005 else
1006 drop_nlink(inode);
1007 mark_inode_dirty(inode);
1008 if (inode->i_nlink == 0)
1009 gfs2_unlink_di(inode);
1010 return 0;
1011 }
1012
1013
1014 /**
1015 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1016 * @dir: The inode of the directory containing the inode to unlink
1017 * @dentry: The file itself
1018 *
1019 * This routine uses the type of the inode as a flag to figure out
1020 * whether this is an unlink or an rmdir.
1021 *
1022 * Returns: errno
1023 */
1024
1025 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1026 {
1027 struct gfs2_inode *dip = GFS2_I(dir);
1028 struct gfs2_sbd *sdp = GFS2_SB(dir);
1029 struct inode *inode = dentry->d_inode;
1030 struct gfs2_inode *ip = GFS2_I(inode);
1031 struct buffer_head *bh;
1032 struct gfs2_holder ghs[3];
1033 struct gfs2_rgrpd *rgd;
1034 int error;
1035
1036 error = gfs2_rindex_update(sdp);
1037 if (error)
1038 return error;
1039
1040 error = -EROFS;
1041
1042 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1043 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1044
1045 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1046 if (!rgd)
1047 goto out_inodes;
1048
1049 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1050
1051
1052 error = gfs2_glock_nq(ghs); /* parent */
1053 if (error)
1054 goto out_parent;
1055
1056 error = gfs2_glock_nq(ghs + 1); /* child */
1057 if (error)
1058 goto out_child;
1059
1060 error = -ENOENT;
1061 if (inode->i_nlink == 0)
1062 goto out_rgrp;
1063
1064 if (S_ISDIR(inode->i_mode)) {
1065 error = -ENOTEMPTY;
1066 if (ip->i_entries > 2 || inode->i_nlink > 2)
1067 goto out_rgrp;
1068 }
1069
1070 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1071 if (error)
1072 goto out_rgrp;
1073
1074 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1075 if (error)
1076 goto out_gunlock;
1077
1078 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1079 if (error)
1080 goto out_gunlock;
1081
1082 error = gfs2_meta_inode_buffer(ip, &bh);
1083 if (error)
1084 goto out_end_trans;
1085
1086 error = gfs2_unlink_inode(dip, dentry, bh);
1087 brelse(bh);
1088
1089 out_end_trans:
1090 gfs2_trans_end(sdp);
1091 out_gunlock:
1092 gfs2_glock_dq(ghs + 2);
1093 out_rgrp:
1094 gfs2_glock_dq(ghs + 1);
1095 out_child:
1096 gfs2_glock_dq(ghs);
1097 out_parent:
1098 gfs2_holder_uninit(ghs + 2);
1099 out_inodes:
1100 gfs2_holder_uninit(ghs + 1);
1101 gfs2_holder_uninit(ghs);
1102 return error;
1103 }
1104
1105 /**
1106 * gfs2_symlink - Create a symlink
1107 * @dir: The directory to create the symlink in
1108 * @dentry: The dentry to put the symlink in
1109 * @symname: The thing which the link points to
1110 *
1111 * Returns: errno
1112 */
1113
1114 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1115 const char *symname)
1116 {
1117 struct gfs2_sbd *sdp = GFS2_SB(dir);
1118 unsigned int size;
1119
1120 size = strlen(symname);
1121 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1122 return -ENAMETOOLONG;
1123
1124 return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1125 }
1126
1127 /**
1128 * gfs2_mkdir - Make a directory
1129 * @dir: The parent directory of the new one
1130 * @dentry: The dentry of the new directory
1131 * @mode: The mode of the new directory
1132 *
1133 * Returns: errno
1134 */
1135
1136 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1137 {
1138 return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 0, 0);
1139 }
1140
1141 /**
1142 * gfs2_mknod - Make a special file
1143 * @dir: The directory in which the special file will reside
1144 * @dentry: The dentry of the special file
1145 * @mode: The mode of the special file
1146 * @dev: The device specification of the special file
1147 *
1148 */
1149
1150 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1151 dev_t dev)
1152 {
1153 return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0, 0);
1154 }
1155
1156 /*
1157 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1158 * @this: move this
1159 * @to: to here
1160 *
1161 * Follow @to back to the root and make sure we don't encounter @this
1162 * Assumes we already hold the rename lock.
1163 *
1164 * Returns: errno
1165 */
1166
1167 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1168 {
1169 struct inode *dir = &to->i_inode;
1170 struct super_block *sb = dir->i_sb;
1171 struct inode *tmp;
1172 int error = 0;
1173
1174 igrab(dir);
1175
1176 for (;;) {
1177 if (dir == &this->i_inode) {
1178 error = -EINVAL;
1179 break;
1180 }
1181 if (dir == sb->s_root->d_inode) {
1182 error = 0;
1183 break;
1184 }
1185
1186 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1187 if (IS_ERR(tmp)) {
1188 error = PTR_ERR(tmp);
1189 break;
1190 }
1191
1192 iput(dir);
1193 dir = tmp;
1194 }
1195
1196 iput(dir);
1197
1198 return error;
1199 }
1200
1201 /**
1202 * gfs2_rename - Rename a file
1203 * @odir: Parent directory of old file name
1204 * @odentry: The old dentry of the file
1205 * @ndir: Parent directory of new file name
1206 * @ndentry: The new dentry of the file
1207 *
1208 * Returns: errno
1209 */
1210
1211 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1212 struct inode *ndir, struct dentry *ndentry)
1213 {
1214 struct gfs2_inode *odip = GFS2_I(odir);
1215 struct gfs2_inode *ndip = GFS2_I(ndir);
1216 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1217 struct gfs2_inode *nip = NULL;
1218 struct gfs2_sbd *sdp = GFS2_SB(odir);
1219 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1220 struct gfs2_rgrpd *nrgd;
1221 unsigned int num_gh;
1222 int dir_rename = 0;
1223 int alloc_required = 0;
1224 unsigned int x;
1225 int error;
1226
1227 if (ndentry->d_inode) {
1228 nip = GFS2_I(ndentry->d_inode);
1229 if (ip == nip)
1230 return 0;
1231 }
1232
1233 error = gfs2_rindex_update(sdp);
1234 if (error)
1235 return error;
1236
1237 if (odip != ndip) {
1238 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1239 0, &r_gh);
1240 if (error)
1241 goto out;
1242
1243 if (S_ISDIR(ip->i_inode.i_mode)) {
1244 dir_rename = 1;
1245 /* don't move a dirctory into it's subdir */
1246 error = gfs2_ok_to_move(ip, ndip);
1247 if (error)
1248 goto out_gunlock_r;
1249 }
1250 }
1251
1252 num_gh = 1;
1253 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1254 if (odip != ndip) {
1255 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1256 num_gh++;
1257 }
1258 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1259 num_gh++;
1260
1261 if (nip) {
1262 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1263 num_gh++;
1264 /* grab the resource lock for unlink flag twiddling
1265 * this is the case of the target file already existing
1266 * so we unlink before doing the rename
1267 */
1268 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1269 if (nrgd)
1270 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1271 }
1272
1273 for (x = 0; x < num_gh; x++) {
1274 error = gfs2_glock_nq(ghs + x);
1275 if (error)
1276 goto out_gunlock;
1277 }
1278
1279 error = -ENOENT;
1280 if (ip->i_inode.i_nlink == 0)
1281 goto out_gunlock;
1282
1283 /* Check out the old directory */
1284
1285 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1286 if (error)
1287 goto out_gunlock;
1288
1289 /* Check out the new directory */
1290
1291 if (nip) {
1292 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1293 if (error)
1294 goto out_gunlock;
1295
1296 if (nip->i_inode.i_nlink == 0) {
1297 error = -EAGAIN;
1298 goto out_gunlock;
1299 }
1300
1301 if (S_ISDIR(nip->i_inode.i_mode)) {
1302 if (nip->i_entries < 2) {
1303 gfs2_consist_inode(nip);
1304 error = -EIO;
1305 goto out_gunlock;
1306 }
1307 if (nip->i_entries > 2) {
1308 error = -ENOTEMPTY;
1309 goto out_gunlock;
1310 }
1311 }
1312 } else {
1313 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1314 if (error)
1315 goto out_gunlock;
1316
1317 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1318 switch (error) {
1319 case -ENOENT:
1320 error = 0;
1321 break;
1322 case 0:
1323 error = -EEXIST;
1324 default:
1325 goto out_gunlock;
1326 };
1327
1328 if (odip != ndip) {
1329 if (!ndip->i_inode.i_nlink) {
1330 error = -ENOENT;
1331 goto out_gunlock;
1332 }
1333 if (ndip->i_entries == (u32)-1) {
1334 error = -EFBIG;
1335 goto out_gunlock;
1336 }
1337 if (S_ISDIR(ip->i_inode.i_mode) &&
1338 ndip->i_inode.i_nlink == (u32)-1) {
1339 error = -EMLINK;
1340 goto out_gunlock;
1341 }
1342 }
1343 }
1344
1345 /* Check out the dir to be renamed */
1346
1347 if (dir_rename) {
1348 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1349 if (error)
1350 goto out_gunlock;
1351 }
1352
1353 if (nip == NULL)
1354 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1355 error = alloc_required;
1356 if (error < 0)
1357 goto out_gunlock;
1358
1359 if (alloc_required) {
1360 struct gfs2_qadata *qa = gfs2_qadata_get(ndip);
1361
1362 if (!qa) {
1363 error = -ENOMEM;
1364 goto out_gunlock;
1365 }
1366
1367 error = gfs2_quota_lock_check(ndip);
1368 if (error)
1369 goto out_alloc;
1370
1371 error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres);
1372 if (error)
1373 goto out_gunlock_q;
1374
1375 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1376 gfs2_rg_blocks(ndip) +
1377 4 * RES_DINODE + 4 * RES_LEAF +
1378 RES_STATFS + RES_QUOTA + 4, 0);
1379 if (error)
1380 goto out_ipreserv;
1381 } else {
1382 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1383 5 * RES_LEAF + 4, 0);
1384 if (error)
1385 goto out_gunlock;
1386 }
1387
1388 /* Remove the target file, if it exists */
1389
1390 if (nip) {
1391 struct buffer_head *bh;
1392 error = gfs2_meta_inode_buffer(nip, &bh);
1393 if (error)
1394 goto out_end_trans;
1395 error = gfs2_unlink_inode(ndip, ndentry, bh);
1396 brelse(bh);
1397 }
1398
1399 if (dir_rename) {
1400 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1401 if (error)
1402 goto out_end_trans;
1403 } else {
1404 struct buffer_head *dibh;
1405 error = gfs2_meta_inode_buffer(ip, &dibh);
1406 if (error)
1407 goto out_end_trans;
1408 ip->i_inode.i_ctime = CURRENT_TIME;
1409 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1410 gfs2_dinode_out(ip, dibh->b_data);
1411 brelse(dibh);
1412 }
1413
1414 error = gfs2_dir_del(odip, odentry);
1415 if (error)
1416 goto out_end_trans;
1417
1418 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1419 if (error)
1420 goto out_end_trans;
1421
1422 out_end_trans:
1423 gfs2_trans_end(sdp);
1424 out_ipreserv:
1425 if (alloc_required)
1426 gfs2_inplace_release(ndip);
1427 out_gunlock_q:
1428 if (alloc_required)
1429 gfs2_quota_unlock(ndip);
1430 out_alloc:
1431 if (alloc_required)
1432 gfs2_qadata_put(ndip);
1433 out_gunlock:
1434 while (x--) {
1435 gfs2_glock_dq(ghs + x);
1436 gfs2_holder_uninit(ghs + x);
1437 }
1438 out_gunlock_r:
1439 if (r_gh.gh_gl)
1440 gfs2_glock_dq_uninit(&r_gh);
1441 out:
1442 return error;
1443 }
1444
1445 /**
1446 * gfs2_follow_link - Follow a symbolic link
1447 * @dentry: The dentry of the link
1448 * @nd: Data that we pass to vfs_follow_link()
1449 *
1450 * This can handle symlinks of any size.
1451 *
1452 * Returns: 0 on success or error code
1453 */
1454
1455 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1456 {
1457 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1458 struct gfs2_holder i_gh;
1459 struct buffer_head *dibh;
1460 unsigned int size;
1461 char *buf;
1462 int error;
1463
1464 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1465 error = gfs2_glock_nq(&i_gh);
1466 if (error) {
1467 gfs2_holder_uninit(&i_gh);
1468 nd_set_link(nd, ERR_PTR(error));
1469 return NULL;
1470 }
1471
1472 size = (unsigned int)i_size_read(&ip->i_inode);
1473 if (size == 0) {
1474 gfs2_consist_inode(ip);
1475 buf = ERR_PTR(-EIO);
1476 goto out;
1477 }
1478
1479 error = gfs2_meta_inode_buffer(ip, &dibh);
1480 if (error) {
1481 buf = ERR_PTR(error);
1482 goto out;
1483 }
1484
1485 buf = kzalloc(size + 1, GFP_NOFS);
1486 if (!buf)
1487 buf = ERR_PTR(-ENOMEM);
1488 else
1489 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1490 brelse(dibh);
1491 out:
1492 gfs2_glock_dq_uninit(&i_gh);
1493 nd_set_link(nd, buf);
1494 return NULL;
1495 }
1496
1497 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1498 {
1499 char *s = nd_get_link(nd);
1500 if (!IS_ERR(s))
1501 kfree(s);
1502 }
1503
1504 /**
1505 * gfs2_permission -
1506 * @inode: The inode
1507 * @mask: The mask to be tested
1508 * @flags: Indicates whether this is an RCU path walk or not
1509 *
1510 * This may be called from the VFS directly, or from within GFS2 with the
1511 * inode locked, so we look to see if the glock is already locked and only
1512 * lock the glock if its not already been done.
1513 *
1514 * Returns: errno
1515 */
1516
1517 int gfs2_permission(struct inode *inode, int mask)
1518 {
1519 struct gfs2_inode *ip;
1520 struct gfs2_holder i_gh;
1521 int error;
1522 int unlock = 0;
1523
1524
1525 ip = GFS2_I(inode);
1526 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1527 if (mask & MAY_NOT_BLOCK)
1528 return -ECHILD;
1529 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1530 if (error)
1531 return error;
1532 unlock = 1;
1533 }
1534
1535 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1536 error = -EACCES;
1537 else
1538 error = generic_permission(inode, mask);
1539 if (unlock)
1540 gfs2_glock_dq_uninit(&i_gh);
1541
1542 return error;
1543 }
1544
1545 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1546 {
1547 setattr_copy(inode, attr);
1548 mark_inode_dirty(inode);
1549 return 0;
1550 }
1551
1552 /**
1553 * gfs2_setattr_simple -
1554 * @ip:
1555 * @attr:
1556 *
1557 * Returns: errno
1558 */
1559
1560 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1561 {
1562 int error;
1563
1564 if (current->journal_info)
1565 return __gfs2_setattr_simple(inode, attr);
1566
1567 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1568 if (error)
1569 return error;
1570
1571 error = __gfs2_setattr_simple(inode, attr);
1572 gfs2_trans_end(GFS2_SB(inode));
1573 return error;
1574 }
1575
1576 static int setattr_chown(struct inode *inode, struct iattr *attr)
1577 {
1578 struct gfs2_inode *ip = GFS2_I(inode);
1579 struct gfs2_sbd *sdp = GFS2_SB(inode);
1580 u32 ouid, ogid, nuid, ngid;
1581 int error;
1582
1583 ouid = inode->i_uid;
1584 ogid = inode->i_gid;
1585 nuid = attr->ia_uid;
1586 ngid = attr->ia_gid;
1587
1588 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1589 ouid = nuid = NO_QUOTA_CHANGE;
1590 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1591 ogid = ngid = NO_QUOTA_CHANGE;
1592
1593 if (!gfs2_qadata_get(ip))
1594 return -ENOMEM;
1595
1596 error = gfs2_quota_lock(ip, nuid, ngid);
1597 if (error)
1598 goto out_alloc;
1599
1600 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1601 error = gfs2_quota_check(ip, nuid, ngid);
1602 if (error)
1603 goto out_gunlock_q;
1604 }
1605
1606 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1607 if (error)
1608 goto out_gunlock_q;
1609
1610 error = gfs2_setattr_simple(inode, attr);
1611 if (error)
1612 goto out_end_trans;
1613
1614 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1615 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1616 gfs2_quota_change(ip, -blocks, ouid, ogid);
1617 gfs2_quota_change(ip, blocks, nuid, ngid);
1618 }
1619
1620 out_end_trans:
1621 gfs2_trans_end(sdp);
1622 out_gunlock_q:
1623 gfs2_quota_unlock(ip);
1624 out_alloc:
1625 gfs2_qadata_put(ip);
1626 return error;
1627 }
1628
1629 /**
1630 * gfs2_setattr - Change attributes on an inode
1631 * @dentry: The dentry which is changing
1632 * @attr: The structure describing the change
1633 *
1634 * The VFS layer wants to change one or more of an inodes attributes. Write
1635 * that change out to disk.
1636 *
1637 * Returns: errno
1638 */
1639
1640 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1641 {
1642 struct inode *inode = dentry->d_inode;
1643 struct gfs2_inode *ip = GFS2_I(inode);
1644 struct gfs2_holder i_gh;
1645 int error;
1646
1647 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1648 if (error)
1649 return error;
1650
1651 error = -EPERM;
1652 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1653 goto out;
1654
1655 error = inode_change_ok(inode, attr);
1656 if (error)
1657 goto out;
1658
1659 if (attr->ia_valid & ATTR_SIZE)
1660 error = gfs2_setattr_size(inode, attr->ia_size);
1661 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1662 error = setattr_chown(inode, attr);
1663 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1664 error = gfs2_acl_chmod(ip, attr);
1665 else
1666 error = gfs2_setattr_simple(inode, attr);
1667
1668 out:
1669 if (!error)
1670 mark_inode_dirty(inode);
1671 gfs2_glock_dq_uninit(&i_gh);
1672 return error;
1673 }
1674
1675 /**
1676 * gfs2_getattr - Read out an inode's attributes
1677 * @mnt: The vfsmount the inode is being accessed from
1678 * @dentry: The dentry to stat
1679 * @stat: The inode's stats
1680 *
1681 * This may be called from the VFS directly, or from within GFS2 with the
1682 * inode locked, so we look to see if the glock is already locked and only
1683 * lock the glock if its not already been done. Note that its the NFS
1684 * readdirplus operation which causes this to be called (from filldir)
1685 * with the glock already held.
1686 *
1687 * Returns: errno
1688 */
1689
1690 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1691 struct kstat *stat)
1692 {
1693 struct inode *inode = dentry->d_inode;
1694 struct gfs2_inode *ip = GFS2_I(inode);
1695 struct gfs2_holder gh;
1696 int error;
1697 int unlock = 0;
1698
1699 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1700 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1701 if (error)
1702 return error;
1703 unlock = 1;
1704 }
1705
1706 generic_fillattr(inode, stat);
1707 if (unlock)
1708 gfs2_glock_dq_uninit(&gh);
1709
1710 return 0;
1711 }
1712
1713 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1714 const void *data, size_t size, int flags)
1715 {
1716 struct inode *inode = dentry->d_inode;
1717 struct gfs2_inode *ip = GFS2_I(inode);
1718 struct gfs2_holder gh;
1719 int ret;
1720
1721 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1722 ret = gfs2_glock_nq(&gh);
1723 if (ret == 0) {
1724 ret = generic_setxattr(dentry, name, data, size, flags);
1725 gfs2_glock_dq(&gh);
1726 }
1727 gfs2_holder_uninit(&gh);
1728 return ret;
1729 }
1730
1731 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1732 void *data, size_t size)
1733 {
1734 struct inode *inode = dentry->d_inode;
1735 struct gfs2_inode *ip = GFS2_I(inode);
1736 struct gfs2_holder gh;
1737 int ret;
1738
1739 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1740 ret = gfs2_glock_nq(&gh);
1741 if (ret == 0) {
1742 ret = generic_getxattr(dentry, name, data, size);
1743 gfs2_glock_dq(&gh);
1744 }
1745 gfs2_holder_uninit(&gh);
1746 return ret;
1747 }
1748
1749 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1750 {
1751 struct inode *inode = dentry->d_inode;
1752 struct gfs2_inode *ip = GFS2_I(inode);
1753 struct gfs2_holder gh;
1754 int ret;
1755
1756 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1757 ret = gfs2_glock_nq(&gh);
1758 if (ret == 0) {
1759 ret = generic_removexattr(dentry, name);
1760 gfs2_glock_dq(&gh);
1761 }
1762 gfs2_holder_uninit(&gh);
1763 return ret;
1764 }
1765
1766 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1767 u64 start, u64 len)
1768 {
1769 struct gfs2_inode *ip = GFS2_I(inode);
1770 struct gfs2_holder gh;
1771 int ret;
1772
1773 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1774 if (ret)
1775 return ret;
1776
1777 mutex_lock(&inode->i_mutex);
1778
1779 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1780 if (ret)
1781 goto out;
1782
1783 if (gfs2_is_stuffed(ip)) {
1784 u64 phys = ip->i_no_addr << inode->i_blkbits;
1785 u64 size = i_size_read(inode);
1786 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1787 FIEMAP_EXTENT_DATA_INLINE;
1788 phys += sizeof(struct gfs2_dinode);
1789 phys += start;
1790 if (start + len > size)
1791 len = size - start;
1792 if (start < size)
1793 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1794 len, flags);
1795 if (ret == 1)
1796 ret = 0;
1797 } else {
1798 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1799 gfs2_block_map);
1800 }
1801
1802 gfs2_glock_dq_uninit(&gh);
1803 out:
1804 mutex_unlock(&inode->i_mutex);
1805 return ret;
1806 }
1807
1808 const struct inode_operations gfs2_file_iops = {
1809 .permission = gfs2_permission,
1810 .setattr = gfs2_setattr,
1811 .getattr = gfs2_getattr,
1812 .setxattr = gfs2_setxattr,
1813 .getxattr = gfs2_getxattr,
1814 .listxattr = gfs2_listxattr,
1815 .removexattr = gfs2_removexattr,
1816 .fiemap = gfs2_fiemap,
1817 .get_acl = gfs2_get_acl,
1818 };
1819
1820 const struct inode_operations gfs2_dir_iops = {
1821 .create = gfs2_create,
1822 .lookup = gfs2_lookup,
1823 .link = gfs2_link,
1824 .unlink = gfs2_unlink,
1825 .symlink = gfs2_symlink,
1826 .mkdir = gfs2_mkdir,
1827 .rmdir = gfs2_unlink,
1828 .mknod = gfs2_mknod,
1829 .rename = gfs2_rename,
1830 .permission = gfs2_permission,
1831 .setattr = gfs2_setattr,
1832 .getattr = gfs2_getattr,
1833 .setxattr = gfs2_setxattr,
1834 .getxattr = gfs2_getxattr,
1835 .listxattr = gfs2_listxattr,
1836 .removexattr = gfs2_removexattr,
1837 .fiemap = gfs2_fiemap,
1838 .get_acl = gfs2_get_acl,
1839 };
1840
1841 const struct inode_operations gfs2_symlink_iops = {
1842 .readlink = generic_readlink,
1843 .follow_link = gfs2_follow_link,
1844 .put_link = gfs2_put_link,
1845 .permission = gfs2_permission,
1846 .setattr = gfs2_setattr,
1847 .getattr = gfs2_getattr,
1848 .setxattr = gfs2_setxattr,
1849 .getxattr = gfs2_getxattr,
1850 .listxattr = gfs2_listxattr,
1851 .removexattr = gfs2_removexattr,
1852 .fiemap = gfs2_fiemap,
1853 .get_acl = gfs2_get_acl,
1854 };
1855
Linux with added FPC-III support