?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ixgbe: Make the bridge mode setting sticky
[linux-2.6/libata-dev.git] / fs / gfs2 / inode.c
blob381893ceefa43b1c58fed94a0417ce4ff6de2631
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 error = gfs2_rindex_update(sdp);
525 if (error)
526 return error;
527
528 error = gfs2_quota_lock(dip, uid, gid);
529 if (error)
530 return error;
531
532 error = gfs2_quota_check(dip, uid, gid);
533 if (error)
534 goto out_quota;
535
536 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
537 if (error)
538 goto out_quota;
539
540 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, symname, size, bhp);
541 gfs2_quota_change(dip, +1, uid, gid);
542 gfs2_trans_end(sdp);
543
544 out_quota:
545 gfs2_quota_unlock(dip);
546 return error;
547 }
548
549 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
550 struct gfs2_inode *ip)
551 {
552 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
553 int alloc_required;
554 struct buffer_head *dibh;
555 int error;
556
557 error = gfs2_rindex_update(sdp);
558 if (error)
559 return error;
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 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres);
574 if (error)
575 goto fail_quota_locks;
576
577 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
578 dip->i_rgd->rd_length +
579 2 * RES_DINODE +
580 RES_STATFS + RES_QUOTA, 0);
581 if (error)
582 goto fail_ipreserv;
583 } else {
584 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
585 if (error)
586 goto fail_quota_locks;
587 }
588
589 error = gfs2_dir_add(&dip->i_inode, name, ip);
590 if (error)
591 goto fail_end_trans;
592
593 error = gfs2_meta_inode_buffer(ip, &dibh);
594 if (error)
595 goto fail_end_trans;
596 set_nlink(&ip->i_inode, S_ISDIR(ip->i_inode.i_mode) ? 2 : 1);
597 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
598 gfs2_dinode_out(ip, dibh->b_data);
599 brelse(dibh);
600 return 0;
601
602 fail_end_trans:
603 gfs2_trans_end(sdp);
604
605 fail_ipreserv:
606 if (alloc_required)
607 gfs2_inplace_release(dip);
608
609 fail_quota_locks:
610 gfs2_quota_unlock(dip);
611
612 fail:
613 return error;
614 }
615
616 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
617 void *fs_info)
618 {
619 const struct xattr *xattr;
620 int err = 0;
621
622 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
623 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
624 xattr->value_len, 0,
625 GFS2_EATYPE_SECURITY);
626 if (err < 0)
627 break;
628 }
629 return err;
630 }
631
632 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
633 const struct qstr *qstr)
634 {
635 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
636 &gfs2_initxattrs, NULL);
637 }
638
639 /**
640 * gfs2_create_inode - Create a new inode
641 * @dir: The parent directory
642 * @dentry: The new dentry
643 * @mode: The permissions on the new inode
644 * @dev: For device nodes, this is the device number
645 * @symname: For symlinks, this is the link destination
646 * @size: The initial size of the inode (ignored for directories)
647 *
648 * Returns: 0 on success, or error code
649 */
650
651 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
652 umode_t mode, dev_t dev, const char *symname,
653 unsigned int size, int excl)
654 {
655 const struct qstr *name = &dentry->d_name;
656 struct gfs2_holder ghs[2];
657 struct inode *inode = NULL;
658 struct gfs2_inode *dip = GFS2_I(dir), *ip;
659 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
660 struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
661 int error;
662 u64 generation;
663 struct buffer_head *bh = NULL;
664
665 if (!name->len || name->len > GFS2_FNAMESIZE)
666 return -ENAMETOOLONG;
667
668 /* We need a reservation to allocate the new dinode block. The
669 directory ip temporarily points to the reservation, but this is
670 being done to get a set of contiguous blocks for the new dinode.
671 Since this is a create, we don't have a sizehint yet, so it will
672 have to use the minimum reservation size. */
673 error = gfs2_rs_alloc(dip);
674 if (error)
675 return error;
676
677 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
678 if (error)
679 goto fail;
680
681 error = create_ok(dip, name, mode);
682 if ((error == -EEXIST) && S_ISREG(mode) && !excl) {
683 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
684 gfs2_glock_dq_uninit(ghs);
685 d_instantiate(dentry, inode);
686 return IS_ERR(inode) ? PTR_ERR(inode) : 0;
687 }
688 if (error)
689 goto fail_gunlock;
690
691 error = alloc_dinode(dip, &inum.no_addr, &generation);
692 if (error)
693 goto fail_gunlock;
694 inum.no_formal_ino = generation;
695
696 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
697 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
698 if (error)
699 goto fail_gunlock;
700
701 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, symname, size, &bh);
702 if (error)
703 goto fail_gunlock2;
704
705 inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr,
706 inum.no_formal_ino, 0);
707 if (IS_ERR(inode))
708 goto fail_gunlock2;
709
710 ip = GFS2_I(inode);
711 error = gfs2_inode_refresh(ip);
712 if (error)
713 goto fail_gunlock2;
714
715 error = gfs2_rs_alloc(ip);
716 if (error)
717 goto fail_gunlock2;
718
719 error = gfs2_acl_create(dip, inode);
720 if (error)
721 goto fail_gunlock2;
722
723 error = gfs2_security_init(dip, ip, name);
724 if (error)
725 goto fail_gunlock2;
726
727 error = link_dinode(dip, name, ip);
728 if (error)
729 goto fail_gunlock2;
730
731 if (bh)
732 brelse(bh);
733
734 gfs2_trans_end(sdp);
735 gfs2_inplace_release(dip);
736 gfs2_quota_unlock(dip);
737 mark_inode_dirty(inode);
738 gfs2_glock_dq_uninit_m(2, ghs);
739 d_instantiate(dentry, inode);
740 return 0;
741
742 fail_gunlock2:
743 gfs2_glock_dq_uninit(ghs + 1);
744 fail_gunlock:
745 gfs2_glock_dq_uninit(ghs);
746 if (inode && !IS_ERR(inode)) {
747 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags);
748 iput(inode);
749 }
750 fail:
751 gfs2_rs_delete(dip);
752 if (bh)
753 brelse(bh);
754 return error;
755 }
756
757 /**
758 * gfs2_create - Create a file
759 * @dir: The directory in which to create the file
760 * @dentry: The dentry of the new file
761 * @mode: The mode of the new file
762 *
763 * Returns: errno
764 */
765
766 static int gfs2_create(struct inode *dir, struct dentry *dentry,
767 umode_t mode, bool excl)
768 {
769 return gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0, excl);
770 }
771
772 /**
773 * gfs2_lookup - Look up a filename in a directory and return its inode
774 * @dir: The directory inode
775 * @dentry: The dentry of the new inode
776 * @nd: passed from Linux VFS, ignored by us
777 *
778 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
779 *
780 * Returns: errno
781 */
782
783 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
784 unsigned int flags)
785 {
786 struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0);
787 if (inode && !IS_ERR(inode)) {
788 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
789 struct gfs2_holder gh;
790 int error;
791 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
792 if (error) {
793 iput(inode);
794 return ERR_PTR(error);
795 }
796 gfs2_glock_dq_uninit(&gh);
797 }
798 return d_splice_alias(inode, dentry);
799 }
800
801 /**
802 * gfs2_link - Link to a file
803 * @old_dentry: The inode to link
804 * @dir: Add link to this directory
805 * @dentry: The name of the link
806 *
807 * Link the inode in "old_dentry" into the directory "dir" with the
808 * name in "dentry".
809 *
810 * Returns: errno
811 */
812
813 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
814 struct dentry *dentry)
815 {
816 struct gfs2_inode *dip = GFS2_I(dir);
817 struct gfs2_sbd *sdp = GFS2_SB(dir);
818 struct inode *inode = old_dentry->d_inode;
819 struct gfs2_inode *ip = GFS2_I(inode);
820 struct gfs2_holder ghs[2];
821 struct buffer_head *dibh;
822 int alloc_required;
823 int error;
824
825 if (S_ISDIR(inode->i_mode))
826 return -EPERM;
827
828 error = gfs2_rs_alloc(dip);
829 if (error)
830 return error;
831
832 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
833 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
834
835 error = gfs2_glock_nq(ghs); /* parent */
836 if (error)
837 goto out_parent;
838
839 error = gfs2_glock_nq(ghs + 1); /* child */
840 if (error)
841 goto out_child;
842
843 error = -ENOENT;
844 if (inode->i_nlink == 0)
845 goto out_gunlock;
846
847 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
848 if (error)
849 goto out_gunlock;
850
851 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
852 switch (error) {
853 case -ENOENT:
854 break;
855 case 0:
856 error = -EEXIST;
857 default:
858 goto out_gunlock;
859 }
860
861 error = -EINVAL;
862 if (!dip->i_inode.i_nlink)
863 goto out_gunlock;
864 error = -EFBIG;
865 if (dip->i_entries == (u32)-1)
866 goto out_gunlock;
867 error = -EPERM;
868 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
869 goto out_gunlock;
870 error = -EINVAL;
871 if (!ip->i_inode.i_nlink)
872 goto out_gunlock;
873 error = -EMLINK;
874 if (ip->i_inode.i_nlink == (u32)-1)
875 goto out_gunlock;
876
877 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
878 if (error < 0)
879 goto out_gunlock;
880 error = 0;
881
882 if (alloc_required) {
883 error = gfs2_quota_lock_check(dip);
884 if (error)
885 goto out_gunlock;
886
887 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres);
888 if (error)
889 goto out_gunlock_q;
890
891 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
892 gfs2_rg_blocks(dip, sdp->sd_max_dirres) +
893 2 * RES_DINODE + RES_STATFS +
894 RES_QUOTA, 0);
895 if (error)
896 goto out_ipres;
897 } else {
898 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
899 if (error)
900 goto out_ipres;
901 }
902
903 error = gfs2_meta_inode_buffer(ip, &dibh);
904 if (error)
905 goto out_end_trans;
906
907 error = gfs2_dir_add(dir, &dentry->d_name, ip);
908 if (error)
909 goto out_brelse;
910
911 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
912 inc_nlink(&ip->i_inode);
913 ip->i_inode.i_ctime = CURRENT_TIME;
914 ihold(inode);
915 d_instantiate(dentry, inode);
916 mark_inode_dirty(inode);
917
918 out_brelse:
919 brelse(dibh);
920 out_end_trans:
921 gfs2_trans_end(sdp);
922 out_ipres:
923 if (alloc_required)
924 gfs2_inplace_release(dip);
925 out_gunlock_q:
926 if (alloc_required)
927 gfs2_quota_unlock(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 error = gfs2_rs_alloc(ndip);
1238 if (error)
1239 return error;
1240
1241 if (odip != ndip) {
1242 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1243 0, &r_gh);
1244 if (error)
1245 goto out;
1246
1247 if (S_ISDIR(ip->i_inode.i_mode)) {
1248 dir_rename = 1;
1249 /* don't move a dirctory into it's subdir */
1250 error = gfs2_ok_to_move(ip, ndip);
1251 if (error)
1252 goto out_gunlock_r;
1253 }
1254 }
1255
1256 num_gh = 1;
1257 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1258 if (odip != ndip) {
1259 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1260 num_gh++;
1261 }
1262 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1263 num_gh++;
1264
1265 if (nip) {
1266 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1267 num_gh++;
1268 /* grab the resource lock for unlink flag twiddling
1269 * this is the case of the target file already existing
1270 * so we unlink before doing the rename
1271 */
1272 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1273 if (nrgd)
1274 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1275 }
1276
1277 for (x = 0; x < num_gh; x++) {
1278 error = gfs2_glock_nq(ghs + x);
1279 if (error)
1280 goto out_gunlock;
1281 }
1282
1283 error = -ENOENT;
1284 if (ip->i_inode.i_nlink == 0)
1285 goto out_gunlock;
1286
1287 /* Check out the old directory */
1288
1289 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1290 if (error)
1291 goto out_gunlock;
1292
1293 /* Check out the new directory */
1294
1295 if (nip) {
1296 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1297 if (error)
1298 goto out_gunlock;
1299
1300 if (nip->i_inode.i_nlink == 0) {
1301 error = -EAGAIN;
1302 goto out_gunlock;
1303 }
1304
1305 if (S_ISDIR(nip->i_inode.i_mode)) {
1306 if (nip->i_entries < 2) {
1307 gfs2_consist_inode(nip);
1308 error = -EIO;
1309 goto out_gunlock;
1310 }
1311 if (nip->i_entries > 2) {
1312 error = -ENOTEMPTY;
1313 goto out_gunlock;
1314 }
1315 }
1316 } else {
1317 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1318 if (error)
1319 goto out_gunlock;
1320
1321 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1322 switch (error) {
1323 case -ENOENT:
1324 error = 0;
1325 break;
1326 case 0:
1327 error = -EEXIST;
1328 default:
1329 goto out_gunlock;
1330 };
1331
1332 if (odip != ndip) {
1333 if (!ndip->i_inode.i_nlink) {
1334 error = -ENOENT;
1335 goto out_gunlock;
1336 }
1337 if (ndip->i_entries == (u32)-1) {
1338 error = -EFBIG;
1339 goto out_gunlock;
1340 }
1341 if (S_ISDIR(ip->i_inode.i_mode) &&
1342 ndip->i_inode.i_nlink == (u32)-1) {
1343 error = -EMLINK;
1344 goto out_gunlock;
1345 }
1346 }
1347 }
1348
1349 /* Check out the dir to be renamed */
1350
1351 if (dir_rename) {
1352 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1353 if (error)
1354 goto out_gunlock;
1355 }
1356
1357 if (nip == NULL)
1358 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1359 error = alloc_required;
1360 if (error < 0)
1361 goto out_gunlock;
1362
1363 if (alloc_required) {
1364 error = gfs2_quota_lock_check(ndip);
1365 if (error)
1366 goto out_gunlock;
1367
1368 error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres);
1369 if (error)
1370 goto out_gunlock_q;
1371
1372 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1373 gfs2_rg_blocks(ndip, sdp->sd_max_dirres) +
1374 4 * RES_DINODE + 4 * RES_LEAF +
1375 RES_STATFS + RES_QUOTA + 4, 0);
1376 if (error)
1377 goto out_ipreserv;
1378 } else {
1379 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1380 5 * RES_LEAF + 4, 0);
1381 if (error)
1382 goto out_gunlock;
1383 }
1384
1385 /* Remove the target file, if it exists */
1386
1387 if (nip) {
1388 struct buffer_head *bh;
1389 error = gfs2_meta_inode_buffer(nip, &bh);
1390 if (error)
1391 goto out_end_trans;
1392 error = gfs2_unlink_inode(ndip, ndentry, bh);
1393 brelse(bh);
1394 }
1395
1396 if (dir_rename) {
1397 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1398 if (error)
1399 goto out_end_trans;
1400 } else {
1401 struct buffer_head *dibh;
1402 error = gfs2_meta_inode_buffer(ip, &dibh);
1403 if (error)
1404 goto out_end_trans;
1405 ip->i_inode.i_ctime = CURRENT_TIME;
1406 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1407 gfs2_dinode_out(ip, dibh->b_data);
1408 brelse(dibh);
1409 }
1410
1411 error = gfs2_dir_del(odip, odentry);
1412 if (error)
1413 goto out_end_trans;
1414
1415 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1416 if (error)
1417 goto out_end_trans;
1418
1419 out_end_trans:
1420 gfs2_trans_end(sdp);
1421 out_ipreserv:
1422 if (alloc_required)
1423 gfs2_inplace_release(ndip);
1424 out_gunlock_q:
1425 if (alloc_required)
1426 gfs2_quota_unlock(ndip);
1427 out_gunlock:
1428 while (x--) {
1429 gfs2_glock_dq(ghs + x);
1430 gfs2_holder_uninit(ghs + x);
1431 }
1432 out_gunlock_r:
1433 if (r_gh.gh_gl)
1434 gfs2_glock_dq_uninit(&r_gh);
1435 out:
1436 return error;
1437 }
1438
1439 /**
1440 * gfs2_follow_link - Follow a symbolic link
1441 * @dentry: The dentry of the link
1442 * @nd: Data that we pass to vfs_follow_link()
1443 *
1444 * This can handle symlinks of any size.
1445 *
1446 * Returns: 0 on success or error code
1447 */
1448
1449 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1450 {
1451 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1452 struct gfs2_holder i_gh;
1453 struct buffer_head *dibh;
1454 unsigned int size;
1455 char *buf;
1456 int error;
1457
1458 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1459 error = gfs2_glock_nq(&i_gh);
1460 if (error) {
1461 gfs2_holder_uninit(&i_gh);
1462 nd_set_link(nd, ERR_PTR(error));
1463 return NULL;
1464 }
1465
1466 size = (unsigned int)i_size_read(&ip->i_inode);
1467 if (size == 0) {
1468 gfs2_consist_inode(ip);
1469 buf = ERR_PTR(-EIO);
1470 goto out;
1471 }
1472
1473 error = gfs2_meta_inode_buffer(ip, &dibh);
1474 if (error) {
1475 buf = ERR_PTR(error);
1476 goto out;
1477 }
1478
1479 buf = kzalloc(size + 1, GFP_NOFS);
1480 if (!buf)
1481 buf = ERR_PTR(-ENOMEM);
1482 else
1483 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1484 brelse(dibh);
1485 out:
1486 gfs2_glock_dq_uninit(&i_gh);
1487 nd_set_link(nd, buf);
1488 return NULL;
1489 }
1490
1491 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1492 {
1493 char *s = nd_get_link(nd);
1494 if (!IS_ERR(s))
1495 kfree(s);
1496 }
1497
1498 /**
1499 * gfs2_permission -
1500 * @inode: The inode
1501 * @mask: The mask to be tested
1502 * @flags: Indicates whether this is an RCU path walk or not
1503 *
1504 * This may be called from the VFS directly, or from within GFS2 with the
1505 * inode locked, so we look to see if the glock is already locked and only
1506 * lock the glock if its not already been done.
1507 *
1508 * Returns: errno
1509 */
1510
1511 int gfs2_permission(struct inode *inode, int mask)
1512 {
1513 struct gfs2_inode *ip;
1514 struct gfs2_holder i_gh;
1515 int error;
1516 int unlock = 0;
1517
1518
1519 ip = GFS2_I(inode);
1520 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1521 if (mask & MAY_NOT_BLOCK)
1522 return -ECHILD;
1523 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1524 if (error)
1525 return error;
1526 unlock = 1;
1527 }
1528
1529 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1530 error = -EACCES;
1531 else
1532 error = generic_permission(inode, mask);
1533 if (unlock)
1534 gfs2_glock_dq_uninit(&i_gh);
1535
1536 return error;
1537 }
1538
1539 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1540 {
1541 setattr_copy(inode, attr);
1542 mark_inode_dirty(inode);
1543 return 0;
1544 }
1545
1546 /**
1547 * gfs2_setattr_simple -
1548 * @ip:
1549 * @attr:
1550 *
1551 * Returns: errno
1552 */
1553
1554 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1555 {
1556 int error;
1557
1558 if (current->journal_info)
1559 return __gfs2_setattr_simple(inode, attr);
1560
1561 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1562 if (error)
1563 return error;
1564
1565 error = __gfs2_setattr_simple(inode, attr);
1566 gfs2_trans_end(GFS2_SB(inode));
1567 return error;
1568 }
1569
1570 static int setattr_chown(struct inode *inode, struct iattr *attr)
1571 {
1572 struct gfs2_inode *ip = GFS2_I(inode);
1573 struct gfs2_sbd *sdp = GFS2_SB(inode);
1574 u32 ouid, ogid, nuid, ngid;
1575 int error;
1576
1577 ouid = inode->i_uid;
1578 ogid = inode->i_gid;
1579 nuid = attr->ia_uid;
1580 ngid = attr->ia_gid;
1581
1582 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1583 ouid = nuid = NO_QUOTA_CHANGE;
1584 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1585 ogid = ngid = NO_QUOTA_CHANGE;
1586
1587 error = gfs2_quota_lock(ip, nuid, ngid);
1588 if (error)
1589 return error;
1590
1591 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1592 error = gfs2_quota_check(ip, nuid, ngid);
1593 if (error)
1594 goto out_gunlock_q;
1595 }
1596
1597 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1598 if (error)
1599 goto out_gunlock_q;
1600
1601 error = gfs2_setattr_simple(inode, attr);
1602 if (error)
1603 goto out_end_trans;
1604
1605 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1606 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1607 gfs2_quota_change(ip, -blocks, ouid, ogid);
1608 gfs2_quota_change(ip, blocks, nuid, ngid);
1609 }
1610
1611 out_end_trans:
1612 gfs2_trans_end(sdp);
1613 out_gunlock_q:
1614 gfs2_quota_unlock(ip);
1615 return error;
1616 }
1617
1618 /**
1619 * gfs2_setattr - Change attributes on an inode
1620 * @dentry: The dentry which is changing
1621 * @attr: The structure describing the change
1622 *
1623 * The VFS layer wants to change one or more of an inodes attributes. Write
1624 * that change out to disk.
1625 *
1626 * Returns: errno
1627 */
1628
1629 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1630 {
1631 struct inode *inode = dentry->d_inode;
1632 struct gfs2_inode *ip = GFS2_I(inode);
1633 struct gfs2_holder i_gh;
1634 int error;
1635
1636 error = gfs2_rs_alloc(ip);
1637 if (error)
1638 return error;
1639
1640 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1641 if (error)
1642 return error;
1643
1644 error = -EPERM;
1645 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1646 goto out;
1647
1648 error = inode_change_ok(inode, attr);
1649 if (error)
1650 goto out;
1651
1652 if (attr->ia_valid & ATTR_SIZE)
1653 error = gfs2_setattr_size(inode, attr->ia_size);
1654 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1655 error = setattr_chown(inode, attr);
1656 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1657 error = gfs2_acl_chmod(ip, attr);
1658 else
1659 error = gfs2_setattr_simple(inode, attr);
1660
1661 out:
1662 if (!error)
1663 mark_inode_dirty(inode);
1664 gfs2_glock_dq_uninit(&i_gh);
1665 return error;
1666 }
1667
1668 /**
1669 * gfs2_getattr - Read out an inode's attributes
1670 * @mnt: The vfsmount the inode is being accessed from
1671 * @dentry: The dentry to stat
1672 * @stat: The inode's stats
1673 *
1674 * This may be called from the VFS directly, or from within GFS2 with the
1675 * inode locked, so we look to see if the glock is already locked and only
1676 * lock the glock if its not already been done. Note that its the NFS
1677 * readdirplus operation which causes this to be called (from filldir)
1678 * with the glock already held.
1679 *
1680 * Returns: errno
1681 */
1682
1683 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1684 struct kstat *stat)
1685 {
1686 struct inode *inode = dentry->d_inode;
1687 struct gfs2_inode *ip = GFS2_I(inode);
1688 struct gfs2_holder gh;
1689 int error;
1690 int unlock = 0;
1691
1692 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1693 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1694 if (error)
1695 return error;
1696 unlock = 1;
1697 }
1698
1699 generic_fillattr(inode, stat);
1700 if (unlock)
1701 gfs2_glock_dq_uninit(&gh);
1702
1703 return 0;
1704 }
1705
1706 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1707 const void *data, size_t size, int flags)
1708 {
1709 struct inode *inode = dentry->d_inode;
1710 struct gfs2_inode *ip = GFS2_I(inode);
1711 struct gfs2_holder gh;
1712 int ret;
1713
1714 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1715 ret = gfs2_glock_nq(&gh);
1716 if (ret == 0) {
1717 ret = gfs2_rs_alloc(ip);
1718 if (ret == 0)
1719 ret = generic_setxattr(dentry, name, data, size, flags);
1720 gfs2_glock_dq(&gh);
1721 }
1722 gfs2_holder_uninit(&gh);
1723 return ret;
1724 }
1725
1726 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1727 void *data, size_t size)
1728 {
1729 struct inode *inode = dentry->d_inode;
1730 struct gfs2_inode *ip = GFS2_I(inode);
1731 struct gfs2_holder gh;
1732 int ret;
1733
1734 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1735 ret = gfs2_glock_nq(&gh);
1736 if (ret == 0) {
1737 ret = generic_getxattr(dentry, name, data, size);
1738 gfs2_glock_dq(&gh);
1739 }
1740 gfs2_holder_uninit(&gh);
1741 return ret;
1742 }
1743
1744 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1745 {
1746 struct inode *inode = dentry->d_inode;
1747 struct gfs2_inode *ip = GFS2_I(inode);
1748 struct gfs2_holder gh;
1749 int ret;
1750
1751 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1752 ret = gfs2_glock_nq(&gh);
1753 if (ret == 0) {
1754 ret = gfs2_rs_alloc(ip);
1755 if (ret == 0)
1756 ret = generic_removexattr(dentry, name);
1757 gfs2_glock_dq(&gh);
1758 }
1759 gfs2_holder_uninit(&gh);
1760 return ret;
1761 }
1762
1763 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1764 u64 start, u64 len)
1765 {
1766 struct gfs2_inode *ip = GFS2_I(inode);
1767 struct gfs2_holder gh;
1768 int ret;
1769
1770 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1771 if (ret)
1772 return ret;
1773
1774 mutex_lock(&inode->i_mutex);
1775
1776 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1777 if (ret)
1778 goto out;
1779
1780 if (gfs2_is_stuffed(ip)) {
1781 u64 phys = ip->i_no_addr << inode->i_blkbits;
1782 u64 size = i_size_read(inode);
1783 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1784 FIEMAP_EXTENT_DATA_INLINE;
1785 phys += sizeof(struct gfs2_dinode);
1786 phys += start;
1787 if (start + len > size)
1788 len = size - start;
1789 if (start < size)
1790 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1791 len, flags);
1792 if (ret == 1)
1793 ret = 0;
1794 } else {
1795 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1796 gfs2_block_map);
1797 }
1798
1799 gfs2_glock_dq_uninit(&gh);
1800 out:
1801 mutex_unlock(&inode->i_mutex);
1802 return ret;
1803 }
1804
1805 const struct inode_operations gfs2_file_iops = {
1806 .permission = gfs2_permission,
1807 .setattr = gfs2_setattr,
1808 .getattr = gfs2_getattr,
1809 .setxattr = gfs2_setxattr,
1810 .getxattr = gfs2_getxattr,
1811 .listxattr = gfs2_listxattr,
1812 .removexattr = gfs2_removexattr,
1813 .fiemap = gfs2_fiemap,
1814 .get_acl = gfs2_get_acl,
1815 };
1816
1817 const struct inode_operations gfs2_dir_iops = {
1818 .create = gfs2_create,
1819 .lookup = gfs2_lookup,
1820 .link = gfs2_link,
1821 .unlink = gfs2_unlink,
1822 .symlink = gfs2_symlink,
1823 .mkdir = gfs2_mkdir,
1824 .rmdir = gfs2_unlink,
1825 .mknod = gfs2_mknod,
1826 .rename = gfs2_rename,
1827 .permission = gfs2_permission,
1828 .setattr = gfs2_setattr,
1829 .getattr = gfs2_getattr,
1830 .setxattr = gfs2_setxattr,
1831 .getxattr = gfs2_getxattr,
1832 .listxattr = gfs2_listxattr,
1833 .removexattr = gfs2_removexattr,
1834 .fiemap = gfs2_fiemap,
1835 .get_acl = gfs2_get_acl,
1836 };
1837
1838 const struct inode_operations gfs2_symlink_iops = {
1839 .readlink = generic_readlink,
1840 .follow_link = gfs2_follow_link,
1841 .put_link = gfs2_put_link,
1842 .permission = gfs2_permission,
1843 .setattr = gfs2_setattr,
1844 .getattr = gfs2_getattr,
1845 .setxattr = gfs2_setxattr,
1846 .getxattr = gfs2_getxattr,
1847 .listxattr = gfs2_listxattr,
1848 .removexattr = gfs2_removexattr,
1849 .fiemap = gfs2_fiemap,
1850 .get_acl = gfs2_get_acl,
1851 };
1852
Linux 2.6 libata-dev (mirror)