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[GFS2] More style fixes
[linux-2.6/verdex.git] / fs / gfs2 / inode.c
blob0d010f0654d9178d98e0702df79c8e9c0c636175
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/posix_acl.h>
16 #include <linux/sort.h>
17 #include <linux/gfs2_ondisk.h>
18 #include <linux/crc32.h>
19
20 #include "gfs2.h"
21 #include "lm_interface.h"
22 #include "incore.h"
23 #include "acl.h"
24 #include "bmap.h"
25 #include "dir.h"
26 #include "eattr.h"
27 #include "glock.h"
28 #include "glops.h"
29 #include "inode.h"
30 #include "log.h"
31 #include "meta_io.h"
32 #include "ops_address.h"
33 #include "ops_file.h"
34 #include "ops_inode.h"
35 #include "quota.h"
36 #include "rgrp.h"
37 #include "trans.h"
38 #include "util.h"
39
40 /**
41 * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode
42 * @ip: The GFS2 inode (with embedded disk inode data)
43 * @inode: The Linux VFS inode
44 *
45 */
46
47 void gfs2_inode_attr_in(struct gfs2_inode *ip)
48 {
49 struct inode *inode = &ip->i_inode;
50 struct gfs2_dinode *di = &ip->i_di;
51
52 inode->i_ino = ip->i_num.no_addr;
53
54 switch (di->di_mode & S_IFMT) {
55 case S_IFBLK:
56 case S_IFCHR:
57 inode->i_rdev = MKDEV(di->di_major, di->di_minor);
58 break;
59 default:
60 inode->i_rdev = 0;
61 break;
62 };
63
64 inode->i_mode = di->di_mode;
65 inode->i_nlink = di->di_nlink;
66 inode->i_uid = di->di_uid;
67 inode->i_gid = di->di_gid;
68 i_size_write(inode, di->di_size);
69 inode->i_atime.tv_sec = di->di_atime;
70 inode->i_mtime.tv_sec = di->di_mtime;
71 inode->i_ctime.tv_sec = di->di_ctime;
72 inode->i_atime.tv_nsec = 0;
73 inode->i_mtime.tv_nsec = 0;
74 inode->i_ctime.tv_nsec = 0;
75 inode->i_blksize = PAGE_SIZE;
76 inode->i_blocks = di->di_blocks <<
77 (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
78
79 if (di->di_flags & GFS2_DIF_IMMUTABLE)
80 inode->i_flags |= S_IMMUTABLE;
81 else
82 inode->i_flags &= ~S_IMMUTABLE;
83
84 if (di->di_flags & GFS2_DIF_APPENDONLY)
85 inode->i_flags |= S_APPEND;
86 else
87 inode->i_flags &= ~S_APPEND;
88 }
89
90 /**
91 * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode
92 * @ip: The GFS2 inode
93 *
94 * Only copy out the attributes that we want the VFS layer
95 * to be able to modify.
96 */
97
98 void gfs2_inode_attr_out(struct gfs2_inode *ip)
99 {
100 struct inode *inode = &ip->i_inode;
101 struct gfs2_dinode *di = &ip->i_di;
102 gfs2_assert_withdraw(GFS2_SB(inode),
103 (di->di_mode & S_IFMT) == (inode->i_mode & S_IFMT));
104 di->di_mode = inode->i_mode;
105 di->di_uid = inode->i_uid;
106 di->di_gid = inode->i_gid;
107 di->di_atime = inode->i_atime.tv_sec;
108 di->di_mtime = inode->i_mtime.tv_sec;
109 di->di_ctime = inode->i_ctime.tv_sec;
110 }
111
112 static int iget_test(struct inode *inode, void *opaque)
113 {
114 struct gfs2_inode *ip = GFS2_I(inode);
115 struct gfs2_inum *inum = opaque;
116
117 if (ip && ip->i_num.no_addr == inum->no_addr)
118 return 1;
119
120 return 0;
121 }
122
123 static int iget_set(struct inode *inode, void *opaque)
124 {
125 struct gfs2_inode *ip = GFS2_I(inode);
126 struct gfs2_inum *inum = opaque;
127
128 ip->i_num = *inum;
129 return 0;
130 }
131
132 struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum *inum)
133 {
134 return ilookup5(sb, (unsigned long)inum->no_formal_ino,
135 iget_test, inum);
136 }
137
138 static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum)
139 {
140 return iget5_locked(sb, (unsigned long)inum->no_formal_ino,
141 iget_test, iget_set, inum);
142 }
143
144 /**
145 * gfs2_inode_lookup - Lookup an inode
146 * @sb: The super block
147 * @inum: The inode number
148 * @type: The type of the inode
149 *
150 * Returns: A VFS inode, or an error
151 */
152
153 struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum *inum, unsigned int type)
154 {
155 struct inode *inode = gfs2_iget(sb, inum);
156 struct gfs2_inode *ip = GFS2_I(inode);
157 struct gfs2_glock *io_gl;
158 int error;
159
160 if (inode->i_state & I_NEW) {
161 struct gfs2_sbd *sdp = GFS2_SB(inode);
162 umode_t mode = DT2IF(type);
163 inode->u.generic_ip = ip;
164 inode->i_mode = mode;
165
166 if (S_ISREG(mode)) {
167 inode->i_op = &gfs2_file_iops;
168 inode->i_fop = &gfs2_file_fops;
169 inode->i_mapping->a_ops = &gfs2_file_aops;
170 } else if (S_ISDIR(mode)) {
171 inode->i_op = &gfs2_dir_iops;
172 inode->i_fop = &gfs2_dir_fops;
173 } else if (S_ISLNK(mode)) {
174 inode->i_op = &gfs2_symlink_iops;
175 } else {
176 inode->i_op = &gfs2_dev_iops;
177 }
178
179 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
180 if (unlikely(error))
181 goto fail;
182 ip->i_gl->gl_object = ip;
183
184 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
185 if (unlikely(error))
186 goto fail_put;
187
188 ip->i_vn = ip->i_gl->gl_vn - 1;
189 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
190 if (unlikely(error))
191 goto fail_iopen;
192
193 gfs2_glock_put(io_gl);
194 unlock_new_inode(inode);
195 }
196
197 return inode;
198 fail_iopen:
199 gfs2_glock_put(io_gl);
200 fail_put:
201 ip->i_gl->gl_object = NULL;
202 gfs2_glock_put(ip->i_gl);
203 fail:
204 iput(inode);
205 return ERR_PTR(error);
206 }
207
208 /**
209 * gfs2_inode_refresh - Refresh the incore copy of the dinode
210 * @ip: The GFS2 inode
211 *
212 * Returns: errno
213 */
214
215 int gfs2_inode_refresh(struct gfs2_inode *ip)
216 {
217 struct buffer_head *dibh;
218 int error;
219
220 error = gfs2_meta_inode_buffer(ip, &dibh);
221 if (error)
222 return error;
223
224 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
225 brelse(dibh);
226 return -EIO;
227 }
228
229 gfs2_dinode_in(&ip->i_di, dibh->b_data);
230
231 brelse(dibh);
232
233 if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) {
234 if (gfs2_consist_inode(ip))
235 gfs2_dinode_print(&ip->i_di);
236 return -EIO;
237 }
238 if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino)
239 return -ESTALE;
240
241 ip->i_vn = ip->i_gl->gl_vn;
242
243 return 0;
244 }
245
246 int gfs2_dinode_dealloc(struct gfs2_inode *ip)
247 {
248 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
249 struct gfs2_alloc *al;
250 struct gfs2_rgrpd *rgd;
251 int error;
252
253 if (ip->i_di.di_blocks != 1) {
254 if (gfs2_consist_inode(ip))
255 gfs2_dinode_print(&ip->i_di);
256 return -EIO;
257 }
258
259 al = gfs2_alloc_get(ip);
260
261 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
262 if (error)
263 goto out;
264
265 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
266 if (error)
267 goto out_qs;
268
269 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
270 if (!rgd) {
271 gfs2_consist_inode(ip);
272 error = -EIO;
273 goto out_rindex_relse;
274 }
275
276 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
277 &al->al_rgd_gh);
278 if (error)
279 goto out_rindex_relse;
280
281 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1);
282 if (error)
283 goto out_rg_gunlock;
284
285 gfs2_trans_add_gl(ip->i_gl);
286
287 gfs2_free_di(rgd, ip);
288
289 gfs2_trans_end(sdp);
290 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
291
292 out_rg_gunlock:
293 gfs2_glock_dq_uninit(&al->al_rgd_gh);
294 out_rindex_relse:
295 gfs2_glock_dq_uninit(&al->al_ri_gh);
296 out_qs:
297 gfs2_quota_unhold(ip);
298 out:
299 gfs2_alloc_put(ip);
300 return error;
301 }
302
303 /**
304 * gfs2_change_nlink - Change nlink count on inode
305 * @ip: The GFS2 inode
306 * @diff: The change in the nlink count required
307 *
308 * Returns: errno
309 */
310
311 int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
312 {
313 struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
314 struct buffer_head *dibh;
315 u32 nlink;
316 int error;
317
318 BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink);
319 nlink = ip->i_di.di_nlink + diff;
320
321 /* If we are reducing the nlink count, but the new value ends up being
322 bigger than the old one, we must have underflowed. */
323 if (diff < 0 && nlink > ip->i_di.di_nlink) {
324 if (gfs2_consist_inode(ip))
325 gfs2_dinode_print(&ip->i_di);
326 return -EIO;
327 }
328
329 error = gfs2_meta_inode_buffer(ip, &dibh);
330 if (error)
331 return error;
332
333 ip->i_di.di_nlink = nlink;
334 ip->i_di.di_ctime = get_seconds();
335 ip->i_inode.i_nlink = nlink;
336
337 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
338 gfs2_dinode_out(&ip->i_di, dibh->b_data);
339 brelse(dibh);
340 mark_inode_dirty(&ip->i_inode);
341
342 if (ip->i_di.di_nlink == 0) {
343 struct gfs2_rgrpd *rgd;
344 struct gfs2_holder ri_gh, rg_gh;
345
346 error = gfs2_rindex_hold(sdp, &ri_gh);
347 if (error)
348 goto out;
349 error = -EIO;
350 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
351 if (!rgd)
352 goto out_norgrp;
353 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
354 if (error)
355 goto out_norgrp;
356
357 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
358 gfs2_glock_dq_uninit(&rg_gh);
359 out_norgrp:
360 gfs2_glock_dq_uninit(&ri_gh);
361 }
362 out:
363 return error;
364 }
365
366 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
367 {
368 struct qstr qstr;
369 gfs2_str2qstr(&qstr, name);
370 return gfs2_lookupi(dip, &qstr, 1, NULL);
371 }
372
373
374 /**
375 * gfs2_lookupi - Look up a filename in a directory and return its inode
376 * @d_gh: An initialized holder for the directory glock
377 * @name: The name of the inode to look for
378 * @is_root: If 1, ignore the caller's permissions
379 * @i_gh: An uninitialized holder for the new inode glock
380 *
381 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
382 * @is_root is true.
383 *
384 * Returns: errno
385 */
386
387 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
388 int is_root, struct nameidata *nd)
389
390 {
391 struct super_block *sb = dir->i_sb;
392 struct gfs2_inode *dip = GFS2_I(dir);
393 struct gfs2_holder d_gh;
394 struct gfs2_inum inum;
395 unsigned int type;
396 int error = 0;
397 struct inode *inode = NULL;
398
399 if (!name->len || name->len > GFS2_FNAMESIZE)
400 return ERR_PTR(-ENAMETOOLONG);
401
402 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
403 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
404 dir == sb->s_root->d_inode)) {
405 igrab(dir);
406 return dir;
407 }
408
409 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
410 if (error)
411 return ERR_PTR(error);
412
413 if (!is_root) {
414 error = permission(dir, MAY_EXEC, NULL);
415 if (error)
416 goto out;
417 }
418
419 error = gfs2_dir_search(dir, name, &inum, &type);
420 if (error)
421 goto out;
422
423 inode = gfs2_inode_lookup(sb, &inum, type);
424
425 out:
426 gfs2_glock_dq_uninit(&d_gh);
427 if (error == -ENOENT)
428 return NULL;
429 return inode;
430 }
431
432 static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
433 {
434 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
435 struct buffer_head *bh;
436 struct gfs2_inum_range ir;
437 int error;
438
439 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
440 if (error)
441 return error;
442 mutex_lock(&sdp->sd_inum_mutex);
443
444 error = gfs2_meta_inode_buffer(ip, &bh);
445 if (error) {
446 mutex_unlock(&sdp->sd_inum_mutex);
447 gfs2_trans_end(sdp);
448 return error;
449 }
450
451 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
452
453 if (ir.ir_length) {
454 *formal_ino = ir.ir_start++;
455 ir.ir_length--;
456 gfs2_trans_add_bh(ip->i_gl, bh, 1);
457 gfs2_inum_range_out(&ir,
458 bh->b_data + sizeof(struct gfs2_dinode));
459 brelse(bh);
460 mutex_unlock(&sdp->sd_inum_mutex);
461 gfs2_trans_end(sdp);
462 return 0;
463 }
464
465 brelse(bh);
466
467 mutex_unlock(&sdp->sd_inum_mutex);
468 gfs2_trans_end(sdp);
469
470 return 1;
471 }
472
473 static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino)
474 {
475 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
476 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
477 struct gfs2_holder gh;
478 struct buffer_head *bh;
479 struct gfs2_inum_range ir;
480 int error;
481
482 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
483 if (error)
484 return error;
485
486 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
487 if (error)
488 goto out;
489 mutex_lock(&sdp->sd_inum_mutex);
490
491 error = gfs2_meta_inode_buffer(ip, &bh);
492 if (error)
493 goto out_end_trans;
494
495 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
496
497 if (!ir.ir_length) {
498 struct buffer_head *m_bh;
499 u64 x, y;
500
501 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
502 if (error)
503 goto out_brelse;
504
505 x = *(u64 *)(m_bh->b_data + sizeof(struct gfs2_dinode));
506 x = y = be64_to_cpu(x);
507 ir.ir_start = x;
508 ir.ir_length = GFS2_INUM_QUANTUM;
509 x += GFS2_INUM_QUANTUM;
510 if (x < y)
511 gfs2_consist_inode(m_ip);
512 x = cpu_to_be64(x);
513 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
514 *(u64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x;
515
516 brelse(m_bh);
517 }
518
519 *formal_ino = ir.ir_start++;
520 ir.ir_length--;
521
522 gfs2_trans_add_bh(ip->i_gl, bh, 1);
523 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
524
525 out_brelse:
526 brelse(bh);
527 out_end_trans:
528 mutex_unlock(&sdp->sd_inum_mutex);
529 gfs2_trans_end(sdp);
530 out:
531 gfs2_glock_dq_uninit(&gh);
532 return error;
533 }
534
535 static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum)
536 {
537 int error;
538
539 error = pick_formal_ino_1(sdp, inum);
540 if (error <= 0)
541 return error;
542
543 error = pick_formal_ino_2(sdp, inum);
544
545 return error;
546 }
547
548 /**
549 * create_ok - OK to create a new on-disk inode here?
550 * @dip: Directory in which dinode is to be created
551 * @name: Name of new dinode
552 * @mode:
553 *
554 * Returns: errno
555 */
556
557 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
558 unsigned int mode)
559 {
560 int error;
561
562 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
563 if (error)
564 return error;
565
566 /* Don't create entries in an unlinked directory */
567 if (!dip->i_di.di_nlink)
568 return -EPERM;
569
570 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
571 switch (error) {
572 case -ENOENT:
573 error = 0;
574 break;
575 case 0:
576 return -EEXIST;
577 default:
578 return error;
579 }
580
581 if (dip->i_di.di_entries == (u32)-1)
582 return -EFBIG;
583 if (S_ISDIR(mode) && dip->i_di.di_nlink == (u32)-1)
584 return -EMLINK;
585
586 return 0;
587 }
588
589 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
590 unsigned int *uid, unsigned int *gid)
591 {
592 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
593 (dip->i_di.di_mode & S_ISUID) && dip->i_di.di_uid) {
594 if (S_ISDIR(*mode))
595 *mode |= S_ISUID;
596 else if (dip->i_di.di_uid != current->fsuid)
597 *mode &= ~07111;
598 *uid = dip->i_di.di_uid;
599 } else
600 *uid = current->fsuid;
601
602 if (dip->i_di.di_mode & S_ISGID) {
603 if (S_ISDIR(*mode))
604 *mode |= S_ISGID;
605 *gid = dip->i_di.di_gid;
606 } else
607 *gid = current->fsgid;
608 }
609
610 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum *inum,
611 u64 *generation)
612 {
613 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
614 int error;
615
616 gfs2_alloc_get(dip);
617
618 dip->i_alloc.al_requested = RES_DINODE;
619 error = gfs2_inplace_reserve(dip);
620 if (error)
621 goto out;
622
623 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
624 if (error)
625 goto out_ipreserv;
626
627 inum->no_addr = gfs2_alloc_di(dip, generation);
628
629 gfs2_trans_end(sdp);
630
631 out_ipreserv:
632 gfs2_inplace_release(dip);
633 out:
634 gfs2_alloc_put(dip);
635 return error;
636 }
637
638 /**
639 * init_dinode - Fill in a new dinode structure
640 * @dip: the directory this inode is being created in
641 * @gl: The glock covering the new inode
642 * @inum: the inode number
643 * @mode: the file permissions
644 * @uid:
645 * @gid:
646 *
647 */
648
649 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
650 const struct gfs2_inum *inum, unsigned int mode,
651 unsigned int uid, unsigned int gid,
652 const u64 *generation)
653 {
654 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
655 struct gfs2_dinode *di;
656 struct buffer_head *dibh;
657
658 dibh = gfs2_meta_new(gl, inum->no_addr);
659 gfs2_trans_add_bh(gl, dibh, 1);
660 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
661 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
662 di = (struct gfs2_dinode *)dibh->b_data;
663
664 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
665 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
666 di->di_mode = cpu_to_be32(mode);
667 di->di_uid = cpu_to_be32(uid);
668 di->di_gid = cpu_to_be32(gid);
669 di->di_nlink = cpu_to_be32(0);
670 di->di_size = cpu_to_be64(0);
671 di->di_blocks = cpu_to_be64(1);
672 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
673 di->di_major = di->di_minor = cpu_to_be32(0);
674 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
675 di->di_generation = cpu_to_be64(*generation);
676 di->di_flags = cpu_to_be32(0);
677
678 if (S_ISREG(mode)) {
679 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
680 gfs2_tune_get(sdp, gt_new_files_jdata))
681 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
682 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
683 gfs2_tune_get(sdp, gt_new_files_directio))
684 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
685 } else if (S_ISDIR(mode)) {
686 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
687 GFS2_DIF_INHERIT_DIRECTIO);
688 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
689 GFS2_DIF_INHERIT_JDATA);
690 }
691
692 di->__pad1 = 0;
693 di->di_payload_format = cpu_to_be32(0);
694 di->di_height = cpu_to_be32(0);
695 di->__pad2 = 0;
696 di->__pad3 = 0;
697 di->di_depth = cpu_to_be16(0);
698 di->di_entries = cpu_to_be32(0);
699 memset(&di->__pad4, 0, sizeof(di->__pad4));
700 di->di_eattr = cpu_to_be64(0);
701 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
702
703 brelse(dibh);
704 }
705
706 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
707 unsigned int mode, const struct gfs2_inum *inum,
708 const u64 *generation)
709 {
710 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
711 unsigned int uid, gid;
712 int error;
713
714 munge_mode_uid_gid(dip, &mode, &uid, &gid);
715 gfs2_alloc_get(dip);
716
717 error = gfs2_quota_lock(dip, uid, gid);
718 if (error)
719 goto out;
720
721 error = gfs2_quota_check(dip, uid, gid);
722 if (error)
723 goto out_quota;
724
725 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
726 if (error)
727 goto out_quota;
728
729 init_dinode(dip, gl, inum, mode, uid, gid, generation);
730 gfs2_quota_change(dip, +1, uid, gid);
731 gfs2_trans_end(sdp);
732
733 out_quota:
734 gfs2_quota_unlock(dip);
735 out:
736 gfs2_alloc_put(dip);
737 return error;
738 }
739
740 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
741 struct gfs2_inode *ip)
742 {
743 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
744 struct gfs2_alloc *al;
745 int alloc_required;
746 struct buffer_head *dibh;
747 int error;
748
749 al = gfs2_alloc_get(dip);
750
751 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
752 if (error)
753 goto fail;
754
755 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
756 if (alloc_required < 0)
757 goto fail;
758 if (alloc_required) {
759 error = gfs2_quota_check(dip, dip->i_di.di_uid,
760 dip->i_di.di_gid);
761 if (error)
762 goto fail_quota_locks;
763
764 al->al_requested = sdp->sd_max_dirres;
765
766 error = gfs2_inplace_reserve(dip);
767 if (error)
768 goto fail_quota_locks;
769
770 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
771 al->al_rgd->rd_ri.ri_length +
772 2 * RES_DINODE +
773 RES_STATFS + RES_QUOTA, 0);
774 if (error)
775 goto fail_ipreserv;
776 } else {
777 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
778 if (error)
779 goto fail_quota_locks;
780 }
781
782 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode));
783 if (error)
784 goto fail_end_trans;
785
786 error = gfs2_meta_inode_buffer(ip, &dibh);
787 if (error)
788 goto fail_end_trans;
789 ip->i_di.di_nlink = 1;
790 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
791 gfs2_dinode_out(&ip->i_di, dibh->b_data);
792 brelse(dibh);
793 return 0;
794
795 fail_end_trans:
796 gfs2_trans_end(sdp);
797
798 fail_ipreserv:
799 if (dip->i_alloc.al_rgd)
800 gfs2_inplace_release(dip);
801
802 fail_quota_locks:
803 gfs2_quota_unlock(dip);
804
805 fail:
806 gfs2_alloc_put(dip);
807 return error;
808 }
809
810 /**
811 * gfs2_createi - Create a new inode
812 * @ghs: An array of two holders
813 * @name: The name of the new file
814 * @mode: the permissions on the new inode
815 *
816 * @ghs[0] is an initialized holder for the directory
817 * @ghs[1] is the holder for the inode lock
818 *
819 * If the return value is not NULL, the glocks on both the directory and the new
820 * file are held. A transaction has been started and an inplace reservation
821 * is held, as well.
822 *
823 * Returns: An inode
824 */
825
826 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
827 unsigned int mode)
828 {
829 struct inode *inode;
830 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
831 struct inode *dir = &dip->i_inode;
832 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
833 struct gfs2_inum inum;
834 int error;
835 u64 generation;
836
837 if (!name->len || name->len > GFS2_FNAMESIZE)
838 return ERR_PTR(-ENAMETOOLONG);
839
840 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
841 error = gfs2_glock_nq(ghs);
842 if (error)
843 goto fail;
844
845 error = create_ok(dip, name, mode);
846 if (error)
847 goto fail_gunlock;
848
849 error = pick_formal_ino(sdp, &inum.no_formal_ino);
850 if (error)
851 goto fail_gunlock;
852
853 error = alloc_dinode(dip, &inum, &generation);
854 if (error)
855 goto fail_gunlock;
856
857 if (inum.no_addr < dip->i_num.no_addr) {
858 gfs2_glock_dq(ghs);
859
860 error = gfs2_glock_nq_num(sdp, inum.no_addr,
861 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
862 GL_SKIP, ghs + 1);
863 if (error) {
864 return ERR_PTR(error);
865 }
866
867 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
868 error = gfs2_glock_nq(ghs);
869 if (error) {
870 gfs2_glock_dq_uninit(ghs + 1);
871 return ERR_PTR(error);
872 }
873
874 error = create_ok(dip, name, mode);
875 if (error)
876 goto fail_gunlock2;
877 } else {
878 error = gfs2_glock_nq_num(sdp, inum.no_addr,
879 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
880 GL_SKIP, ghs + 1);
881 if (error)
882 goto fail_gunlock;
883 }
884
885 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation);
886 if (error)
887 goto fail_gunlock2;
888
889 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
890 if (IS_ERR(inode))
891 goto fail_gunlock2;
892
893 error = gfs2_inode_refresh(GFS2_I(inode));
894 if (error)
895 goto fail_iput;
896
897 error = gfs2_acl_create(dip, GFS2_I(inode));
898 if (error)
899 goto fail_iput;
900
901 error = link_dinode(dip, name, GFS2_I(inode));
902 if (error)
903 goto fail_iput;
904
905 if (!inode)
906 return ERR_PTR(-ENOMEM);
907 return inode;
908
909 fail_iput:
910 iput(inode);
911 fail_gunlock2:
912 gfs2_glock_dq_uninit(ghs + 1);
913 fail_gunlock:
914 gfs2_glock_dq(ghs);
915 fail:
916 return ERR_PTR(error);
917 }
918
919 /**
920 * gfs2_rmdiri - Remove a directory
921 * @dip: The parent directory of the directory to be removed
922 * @name: The name of the directory to be removed
923 * @ip: The GFS2 inode of the directory to be removed
924 *
925 * Assumes Glocks on dip and ip are held
926 *
927 * Returns: errno
928 */
929
930 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
931 struct gfs2_inode *ip)
932 {
933 struct qstr dotname;
934 int error;
935
936 if (ip->i_di.di_entries != 2) {
937 if (gfs2_consist_inode(ip))
938 gfs2_dinode_print(&ip->i_di);
939 return -EIO;
940 }
941
942 error = gfs2_dir_del(dip, name);
943 if (error)
944 return error;
945
946 error = gfs2_change_nlink(dip, -1);
947 if (error)
948 return error;
949
950 gfs2_str2qstr(&dotname, ".");
951 error = gfs2_dir_del(ip, &dotname);
952 if (error)
953 return error;
954
955 gfs2_str2qstr(&dotname, "..");
956 error = gfs2_dir_del(ip, &dotname);
957 if (error)
958 return error;
959
960 error = gfs2_change_nlink(ip, -2);
961 if (error)
962 return error;
963
964 return error;
965 }
966
967 /*
968 * gfs2_unlink_ok - check to see that a inode is still in a directory
969 * @dip: the directory
970 * @name: the name of the file
971 * @ip: the inode
972 *
973 * Assumes that the lock on (at least) @dip is held.
974 *
975 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
976 */
977
978 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
979 struct gfs2_inode *ip)
980 {
981 struct gfs2_inum inum;
982 unsigned int type;
983 int error;
984
985 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
986 return -EPERM;
987
988 if ((dip->i_di.di_mode & S_ISVTX) &&
989 dip->i_di.di_uid != current->fsuid &&
990 ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER))
991 return -EPERM;
992
993 if (IS_APPEND(&dip->i_inode))
994 return -EPERM;
995
996 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
997 if (error)
998 return error;
999
1000 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
1001 if (error)
1002 return error;
1003
1004 if (!gfs2_inum_equal(&inum, &ip->i_num))
1005 return -ENOENT;
1006
1007 if (IF2DT(ip->i_di.di_mode) != type) {
1008 gfs2_consist_inode(dip);
1009 return -EIO;
1010 }
1011
1012 return 0;
1013 }
1014
1015 /*
1016 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1017 * @this: move this
1018 * @to: to here
1019 *
1020 * Follow @to back to the root and make sure we don't encounter @this
1021 * Assumes we already hold the rename lock.
1022 *
1023 * Returns: errno
1024 */
1025
1026 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1027 {
1028 struct inode *dir = &to->i_inode;
1029 struct super_block *sb = dir->i_sb;
1030 struct inode *tmp;
1031 struct qstr dotdot;
1032 int error = 0;
1033
1034 gfs2_str2qstr(&dotdot, "..");
1035
1036 igrab(dir);
1037
1038 for (;;) {
1039 if (dir == &this->i_inode) {
1040 error = -EINVAL;
1041 break;
1042 }
1043 if (dir == sb->s_root->d_inode) {
1044 error = 0;
1045 break;
1046 }
1047
1048 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1049 if (IS_ERR(tmp)) {
1050 error = PTR_ERR(tmp);
1051 break;
1052 }
1053
1054 iput(dir);
1055 dir = tmp;
1056 }
1057
1058 iput(dir);
1059
1060 return error;
1061 }
1062
1063 /**
1064 * gfs2_readlinki - return the contents of a symlink
1065 * @ip: the symlink's inode
1066 * @buf: a pointer to the buffer to be filled
1067 * @len: a pointer to the length of @buf
1068 *
1069 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1070 * to be freed by the caller.
1071 *
1072 * Returns: errno
1073 */
1074
1075 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1076 {
1077 struct gfs2_holder i_gh;
1078 struct buffer_head *dibh;
1079 unsigned int x;
1080 int error;
1081
1082 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1083 error = gfs2_glock_nq_atime(&i_gh);
1084 if (error) {
1085 gfs2_holder_uninit(&i_gh);
1086 return error;
1087 }
1088
1089 if (!ip->i_di.di_size) {
1090 gfs2_consist_inode(ip);
1091 error = -EIO;
1092 goto out;
1093 }
1094
1095 error = gfs2_meta_inode_buffer(ip, &dibh);
1096 if (error)
1097 goto out;
1098
1099 x = ip->i_di.di_size + 1;
1100 if (x > *len) {
1101 *buf = kmalloc(x, GFP_KERNEL);
1102 if (!*buf) {
1103 error = -ENOMEM;
1104 goto out_brelse;
1105 }
1106 }
1107
1108 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1109 *len = x;
1110
1111 out_brelse:
1112 brelse(dibh);
1113 out:
1114 gfs2_glock_dq_uninit(&i_gh);
1115 return error;
1116 }
1117
1118 /**
1119 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1120 * conditionally update the inode's atime
1121 * @gh: the holder to acquire
1122 *
1123 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1124 * Update if the difference between the current time and the inode's current
1125 * atime is greater than an interval specified at mount.
1126 *
1127 * Returns: errno
1128 */
1129
1130 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1131 {
1132 struct gfs2_glock *gl = gh->gh_gl;
1133 struct gfs2_sbd *sdp = gl->gl_sbd;
1134 struct gfs2_inode *ip = gl->gl_object;
1135 s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1136 unsigned int state;
1137 int flags;
1138 int error;
1139
1140 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1141 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1142 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1143 return -EINVAL;
1144
1145 state = gh->gh_state;
1146 flags = gh->gh_flags;
1147
1148 error = gfs2_glock_nq(gh);
1149 if (error)
1150 return error;
1151
1152 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1153 (sdp->sd_vfs->s_flags & MS_RDONLY))
1154 return 0;
1155
1156 curtime = get_seconds();
1157 if (curtime - ip->i_di.di_atime >= quantum) {
1158 gfs2_glock_dq(gh);
1159 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1160 gh);
1161 error = gfs2_glock_nq(gh);
1162 if (error)
1163 return error;
1164
1165 /* Verify that atime hasn't been updated while we were
1166 trying to get exclusive lock. */
1167
1168 curtime = get_seconds();
1169 if (curtime - ip->i_di.di_atime >= quantum) {
1170 struct buffer_head *dibh;
1171
1172 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1173 if (error == -EROFS)
1174 return 0;
1175 if (error)
1176 goto fail;
1177
1178 error = gfs2_meta_inode_buffer(ip, &dibh);
1179 if (error)
1180 goto fail_end_trans;
1181
1182 ip->i_di.di_atime = curtime;
1183
1184 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1185 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1186 brelse(dibh);
1187
1188 gfs2_trans_end(sdp);
1189 }
1190
1191 /* If someone else has asked for the glock,
1192 unlock and let them have it. Then reacquire
1193 in the original state. */
1194 if (gfs2_glock_is_blocking(gl)) {
1195 gfs2_glock_dq(gh);
1196 gfs2_holder_reinit(state, flags, gh);
1197 return gfs2_glock_nq(gh);
1198 }
1199 }
1200
1201 return 0;
1202
1203 fail_end_trans:
1204 gfs2_trans_end(sdp);
1205 fail:
1206 gfs2_glock_dq(gh);
1207 return error;
1208 }
1209
1210 /**
1211 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1212 * @arg_a: the first structure
1213 * @arg_b: the second structure
1214 *
1215 * Returns: 1 if A > B
1216 * -1 if A < B
1217 * 0 if A == B
1218 */
1219
1220 static int glock_compare_atime(const void *arg_a, const void *arg_b)
1221 {
1222 const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a;
1223 const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b;
1224 const struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1225 const struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1226
1227 if (a->ln_number > b->ln_number)
1228 return 1;
1229 if (a->ln_number < b->ln_number)
1230 return -1;
1231 if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE)
1232 return 1;
1233 if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME))
1234 return 1;
1235
1236 return 0;
1237 }
1238
1239 /**
1240 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1241 * atime update
1242 * @num_gh: the number of structures
1243 * @ghs: an array of struct gfs2_holder structures
1244 *
1245 * Returns: 0 on success (all glocks acquired),
1246 * errno on failure (no glocks acquired)
1247 */
1248
1249 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
1250 {
1251 struct gfs2_holder **p;
1252 unsigned int x;
1253 int error = 0;
1254
1255 if (!num_gh)
1256 return 0;
1257
1258 if (num_gh == 1) {
1259 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1260 if (ghs->gh_flags & GL_ATIME)
1261 error = gfs2_glock_nq_atime(ghs);
1262 else
1263 error = gfs2_glock_nq(ghs);
1264 return error;
1265 }
1266
1267 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
1268 if (!p)
1269 return -ENOMEM;
1270
1271 for (x = 0; x < num_gh; x++)
1272 p[x] = &ghs[x];
1273
1274 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
1275
1276 for (x = 0; x < num_gh; x++) {
1277 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1278
1279 if (p[x]->gh_flags & GL_ATIME)
1280 error = gfs2_glock_nq_atime(p[x]);
1281 else
1282 error = gfs2_glock_nq(p[x]);
1283
1284 if (error) {
1285 while (x--)
1286 gfs2_glock_dq(p[x]);
1287 break;
1288 }
1289 }
1290
1291 kfree(p);
1292 return error;
1293 }
1294
1295
1296 static int
1297 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1298 {
1299 struct buffer_head *dibh;
1300 int error;
1301
1302 error = gfs2_meta_inode_buffer(ip, &dibh);
1303 if (!error) {
1304 error = inode_setattr(&ip->i_inode, attr);
1305 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1306 gfs2_inode_attr_out(ip);
1307
1308 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1309 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1310 brelse(dibh);
1311 }
1312 return error;
1313 }
1314
1315 /**
1316 * gfs2_setattr_simple -
1317 * @ip:
1318 * @attr:
1319 *
1320 * Called with a reference on the vnode.
1321 *
1322 * Returns: errno
1323 */
1324
1325 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1326 {
1327 int error;
1328
1329 if (current->journal_info)
1330 return __gfs2_setattr_simple(ip, attr);
1331
1332 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1333 if (error)
1334 return error;
1335
1336 error = __gfs2_setattr_simple(ip, attr);
1337 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1338 return error;
1339 }
1340
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