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[GFS2] inode-diet: Eliminate i_blksize from the inode structure
[linux-2.6/mini2440.git] / fs / gfs2 / inode.c
blob57a4c8b68587134059e4c505cd2cf3c56ffb79c7
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 #include <linux/lm_interface.h>
20
21 #include "gfs2.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_blocks = di->di_blocks <<
76 (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
77
78 if (di->di_flags & GFS2_DIF_IMMUTABLE)
79 inode->i_flags |= S_IMMUTABLE;
80 else
81 inode->i_flags &= ~S_IMMUTABLE;
82
83 if (di->di_flags & GFS2_DIF_APPENDONLY)
84 inode->i_flags |= S_APPEND;
85 else
86 inode->i_flags &= ~S_APPEND;
87 }
88
89 /**
90 * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode
91 * @ip: The GFS2 inode
92 *
93 * Only copy out the attributes that we want the VFS layer
94 * to be able to modify.
95 */
96
97 void gfs2_inode_attr_out(struct gfs2_inode *ip)
98 {
99 struct inode *inode = &ip->i_inode;
100 struct gfs2_dinode *di = &ip->i_di;
101 gfs2_assert_withdraw(GFS2_SB(inode),
102 (di->di_mode & S_IFMT) == (inode->i_mode & S_IFMT));
103 di->di_mode = inode->i_mode;
104 di->di_uid = inode->i_uid;
105 di->di_gid = inode->i_gid;
106 di->di_atime = inode->i_atime.tv_sec;
107 di->di_mtime = inode->i_mtime.tv_sec;
108 di->di_ctime = inode->i_ctime.tv_sec;
109 }
110
111 static int iget_test(struct inode *inode, void *opaque)
112 {
113 struct gfs2_inode *ip = GFS2_I(inode);
114 struct gfs2_inum *inum = opaque;
115
116 if (ip && ip->i_num.no_addr == inum->no_addr)
117 return 1;
118
119 return 0;
120 }
121
122 static int iget_set(struct inode *inode, void *opaque)
123 {
124 struct gfs2_inode *ip = GFS2_I(inode);
125 struct gfs2_inum *inum = opaque;
126
127 ip->i_num = *inum;
128 return 0;
129 }
130
131 struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum *inum)
132 {
133 return ilookup5(sb, (unsigned long)inum->no_formal_ino,
134 iget_test, inum);
135 }
136
137 static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum)
138 {
139 return iget5_locked(sb, (unsigned long)inum->no_formal_ino,
140 iget_test, iget_set, inum);
141 }
142
143 /**
144 * gfs2_inode_lookup - Lookup an inode
145 * @sb: The super block
146 * @inum: The inode number
147 * @type: The type of the inode
148 *
149 * Returns: A VFS inode, or an error
150 */
151
152 struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum *inum, unsigned int type)
153 {
154 struct inode *inode = gfs2_iget(sb, inum);
155 struct gfs2_inode *ip = GFS2_I(inode);
156 struct gfs2_glock *io_gl;
157 int error;
158
159 if (inode->i_state & I_NEW) {
160 struct gfs2_sbd *sdp = GFS2_SB(inode);
161 umode_t mode = DT2IF(type);
162 inode->i_private = ip;
163 inode->i_mode = mode;
164
165 if (S_ISREG(mode)) {
166 inode->i_op = &gfs2_file_iops;
167 inode->i_fop = &gfs2_file_fops;
168 inode->i_mapping->a_ops = &gfs2_file_aops;
169 } else if (S_ISDIR(mode)) {
170 inode->i_op = &gfs2_dir_iops;
171 inode->i_fop = &gfs2_dir_fops;
172 } else if (S_ISLNK(mode)) {
173 inode->i_op = &gfs2_symlink_iops;
174 } else {
175 inode->i_op = &gfs2_dev_iops;
176 }
177
178 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
179 if (unlikely(error))
180 goto fail;
181 ip->i_gl->gl_object = ip;
182
183 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
184 if (unlikely(error))
185 goto fail_put;
186
187 ip->i_vn = ip->i_gl->gl_vn - 1;
188 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
189 if (unlikely(error))
190 goto fail_iopen;
191
192 gfs2_glock_put(io_gl);
193 unlock_new_inode(inode);
194 }
195
196 return inode;
197 fail_iopen:
198 gfs2_glock_put(io_gl);
199 fail_put:
200 ip->i_gl->gl_object = NULL;
201 gfs2_glock_put(ip->i_gl);
202 fail:
203 iput(inode);
204 return ERR_PTR(error);
205 }
206
207 /**
208 * gfs2_inode_refresh - Refresh the incore copy of the dinode
209 * @ip: The GFS2 inode
210 *
211 * Returns: errno
212 */
213
214 int gfs2_inode_refresh(struct gfs2_inode *ip)
215 {
216 struct buffer_head *dibh;
217 int error;
218
219 error = gfs2_meta_inode_buffer(ip, &dibh);
220 if (error)
221 return error;
222
223 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
224 brelse(dibh);
225 return -EIO;
226 }
227
228 gfs2_dinode_in(&ip->i_di, dibh->b_data);
229
230 brelse(dibh);
231
232 if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) {
233 if (gfs2_consist_inode(ip))
234 gfs2_dinode_print(&ip->i_di);
235 return -EIO;
236 }
237 if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino)
238 return -ESTALE;
239
240 ip->i_vn = ip->i_gl->gl_vn;
241
242 return 0;
243 }
244
245 int gfs2_dinode_dealloc(struct gfs2_inode *ip)
246 {
247 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
248 struct gfs2_alloc *al;
249 struct gfs2_rgrpd *rgd;
250 int error;
251
252 if (ip->i_di.di_blocks != 1) {
253 if (gfs2_consist_inode(ip))
254 gfs2_dinode_print(&ip->i_di);
255 return -EIO;
256 }
257
258 al = gfs2_alloc_get(ip);
259
260 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
261 if (error)
262 goto out;
263
264 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
265 if (error)
266 goto out_qs;
267
268 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
269 if (!rgd) {
270 gfs2_consist_inode(ip);
271 error = -EIO;
272 goto out_rindex_relse;
273 }
274
275 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
276 &al->al_rgd_gh);
277 if (error)
278 goto out_rindex_relse;
279
280 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1);
281 if (error)
282 goto out_rg_gunlock;
283
284 gfs2_trans_add_gl(ip->i_gl);
285
286 gfs2_free_di(rgd, ip);
287
288 gfs2_trans_end(sdp);
289 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
290
291 out_rg_gunlock:
292 gfs2_glock_dq_uninit(&al->al_rgd_gh);
293 out_rindex_relse:
294 gfs2_glock_dq_uninit(&al->al_ri_gh);
295 out_qs:
296 gfs2_quota_unhold(ip);
297 out:
298 gfs2_alloc_put(ip);
299 return error;
300 }
301
302 /**
303 * gfs2_change_nlink - Change nlink count on inode
304 * @ip: The GFS2 inode
305 * @diff: The change in the nlink count required
306 *
307 * Returns: errno
308 */
309
310 int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
311 {
312 struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
313 struct buffer_head *dibh;
314 u32 nlink;
315 int error;
316
317 BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink);
318 nlink = ip->i_di.di_nlink + diff;
319
320 /* If we are reducing the nlink count, but the new value ends up being
321 bigger than the old one, we must have underflowed. */
322 if (diff < 0 && nlink > ip->i_di.di_nlink) {
323 if (gfs2_consist_inode(ip))
324 gfs2_dinode_print(&ip->i_di);
325 return -EIO;
326 }
327
328 error = gfs2_meta_inode_buffer(ip, &dibh);
329 if (error)
330 return error;
331
332 ip->i_di.di_nlink = nlink;
333 ip->i_di.di_ctime = get_seconds();
334 ip->i_inode.i_nlink = nlink;
335
336 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
337 gfs2_dinode_out(&ip->i_di, dibh->b_data);
338 brelse(dibh);
339 mark_inode_dirty(&ip->i_inode);
340
341 if (ip->i_di.di_nlink == 0) {
342 struct gfs2_rgrpd *rgd;
343 struct gfs2_holder ri_gh, rg_gh;
344
345 error = gfs2_rindex_hold(sdp, &ri_gh);
346 if (error)
347 goto out;
348 error = -EIO;
349 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
350 if (!rgd)
351 goto out_norgrp;
352 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
353 if (error)
354 goto out_norgrp;
355
356 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
357 gfs2_glock_dq_uninit(&rg_gh);
358 out_norgrp:
359 gfs2_glock_dq_uninit(&ri_gh);
360 }
361 out:
362 return error;
363 }
364
365 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
366 {
367 struct qstr qstr;
368 gfs2_str2qstr(&qstr, name);
369 return gfs2_lookupi(dip, &qstr, 1, NULL);
370 }
371
372
373 /**
374 * gfs2_lookupi - Look up a filename in a directory and return its inode
375 * @d_gh: An initialized holder for the directory glock
376 * @name: The name of the inode to look for
377 * @is_root: If 1, ignore the caller's permissions
378 * @i_gh: An uninitialized holder for the new inode glock
379 *
380 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
381 * @is_root is true.
382 *
383 * Returns: errno
384 */
385
386 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
387 int is_root, struct nameidata *nd)
388 {
389 struct super_block *sb = dir->i_sb;
390 struct gfs2_inode *dip = GFS2_I(dir);
391 struct gfs2_holder d_gh;
392 struct gfs2_inum inum;
393 unsigned int type;
394 int error = 0;
395 struct inode *inode = NULL;
396
397 if (!name->len || name->len > GFS2_FNAMESIZE)
398 return ERR_PTR(-ENAMETOOLONG);
399
400 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
401 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
402 dir == sb->s_root->d_inode)) {
403 igrab(dir);
404 return dir;
405 }
406
407 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
408 if (error)
409 return ERR_PTR(error);
410
411 if (!is_root) {
412 error = permission(dir, MAY_EXEC, NULL);
413 if (error)
414 goto out;
415 }
416
417 error = gfs2_dir_search(dir, name, &inum, &type);
418 if (error)
419 goto out;
420
421 inode = gfs2_inode_lookup(sb, &inum, type);
422
423 out:
424 gfs2_glock_dq_uninit(&d_gh);
425 if (error == -ENOENT)
426 return NULL;
427 return inode;
428 }
429
430 static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
431 {
432 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
433 struct buffer_head *bh;
434 struct gfs2_inum_range ir;
435 int error;
436
437 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
438 if (error)
439 return error;
440 mutex_lock(&sdp->sd_inum_mutex);
441
442 error = gfs2_meta_inode_buffer(ip, &bh);
443 if (error) {
444 mutex_unlock(&sdp->sd_inum_mutex);
445 gfs2_trans_end(sdp);
446 return error;
447 }
448
449 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
450
451 if (ir.ir_length) {
452 *formal_ino = ir.ir_start++;
453 ir.ir_length--;
454 gfs2_trans_add_bh(ip->i_gl, bh, 1);
455 gfs2_inum_range_out(&ir,
456 bh->b_data + sizeof(struct gfs2_dinode));
457 brelse(bh);
458 mutex_unlock(&sdp->sd_inum_mutex);
459 gfs2_trans_end(sdp);
460 return 0;
461 }
462
463 brelse(bh);
464
465 mutex_unlock(&sdp->sd_inum_mutex);
466 gfs2_trans_end(sdp);
467
468 return 1;
469 }
470
471 static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino)
472 {
473 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
474 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
475 struct gfs2_holder gh;
476 struct buffer_head *bh;
477 struct gfs2_inum_range ir;
478 int error;
479
480 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
481 if (error)
482 return error;
483
484 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
485 if (error)
486 goto out;
487 mutex_lock(&sdp->sd_inum_mutex);
488
489 error = gfs2_meta_inode_buffer(ip, &bh);
490 if (error)
491 goto out_end_trans;
492
493 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
494
495 if (!ir.ir_length) {
496 struct buffer_head *m_bh;
497 u64 x, y;
498
499 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
500 if (error)
501 goto out_brelse;
502
503 x = *(u64 *)(m_bh->b_data + sizeof(struct gfs2_dinode));
504 x = y = be64_to_cpu(x);
505 ir.ir_start = x;
506 ir.ir_length = GFS2_INUM_QUANTUM;
507 x += GFS2_INUM_QUANTUM;
508 if (x < y)
509 gfs2_consist_inode(m_ip);
510 x = cpu_to_be64(x);
511 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
512 *(u64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x;
513
514 brelse(m_bh);
515 }
516
517 *formal_ino = ir.ir_start++;
518 ir.ir_length--;
519
520 gfs2_trans_add_bh(ip->i_gl, bh, 1);
521 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
522
523 out_brelse:
524 brelse(bh);
525 out_end_trans:
526 mutex_unlock(&sdp->sd_inum_mutex);
527 gfs2_trans_end(sdp);
528 out:
529 gfs2_glock_dq_uninit(&gh);
530 return error;
531 }
532
533 static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum)
534 {
535 int error;
536
537 error = pick_formal_ino_1(sdp, inum);
538 if (error <= 0)
539 return error;
540
541 error = pick_formal_ino_2(sdp, inum);
542
543 return error;
544 }
545
546 /**
547 * create_ok - OK to create a new on-disk inode here?
548 * @dip: Directory in which dinode is to be created
549 * @name: Name of new dinode
550 * @mode:
551 *
552 * Returns: errno
553 */
554
555 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
556 unsigned int mode)
557 {
558 int error;
559
560 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
561 if (error)
562 return error;
563
564 /* Don't create entries in an unlinked directory */
565 if (!dip->i_di.di_nlink)
566 return -EPERM;
567
568 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
569 switch (error) {
570 case -ENOENT:
571 error = 0;
572 break;
573 case 0:
574 return -EEXIST;
575 default:
576 return error;
577 }
578
579 if (dip->i_di.di_entries == (u32)-1)
580 return -EFBIG;
581 if (S_ISDIR(mode) && dip->i_di.di_nlink == (u32)-1)
582 return -EMLINK;
583
584 return 0;
585 }
586
587 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
588 unsigned int *uid, unsigned int *gid)
589 {
590 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
591 (dip->i_di.di_mode & S_ISUID) && dip->i_di.di_uid) {
592 if (S_ISDIR(*mode))
593 *mode |= S_ISUID;
594 else if (dip->i_di.di_uid != current->fsuid)
595 *mode &= ~07111;
596 *uid = dip->i_di.di_uid;
597 } else
598 *uid = current->fsuid;
599
600 if (dip->i_di.di_mode & S_ISGID) {
601 if (S_ISDIR(*mode))
602 *mode |= S_ISGID;
603 *gid = dip->i_di.di_gid;
604 } else
605 *gid = current->fsgid;
606 }
607
608 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum *inum,
609 u64 *generation)
610 {
611 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
612 int error;
613
614 gfs2_alloc_get(dip);
615
616 dip->i_alloc.al_requested = RES_DINODE;
617 error = gfs2_inplace_reserve(dip);
618 if (error)
619 goto out;
620
621 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
622 if (error)
623 goto out_ipreserv;
624
625 inum->no_addr = gfs2_alloc_di(dip, generation);
626
627 gfs2_trans_end(sdp);
628
629 out_ipreserv:
630 gfs2_inplace_release(dip);
631 out:
632 gfs2_alloc_put(dip);
633 return error;
634 }
635
636 /**
637 * init_dinode - Fill in a new dinode structure
638 * @dip: the directory this inode is being created in
639 * @gl: The glock covering the new inode
640 * @inum: the inode number
641 * @mode: the file permissions
642 * @uid:
643 * @gid:
644 *
645 */
646
647 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
648 const struct gfs2_inum *inum, unsigned int mode,
649 unsigned int uid, unsigned int gid,
650 const u64 *generation)
651 {
652 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
653 struct gfs2_dinode *di;
654 struct buffer_head *dibh;
655
656 dibh = gfs2_meta_new(gl, inum->no_addr);
657 gfs2_trans_add_bh(gl, dibh, 1);
658 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
659 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
660 di = (struct gfs2_dinode *)dibh->b_data;
661
662 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
663 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
664 di->di_mode = cpu_to_be32(mode);
665 di->di_uid = cpu_to_be32(uid);
666 di->di_gid = cpu_to_be32(gid);
667 di->di_nlink = cpu_to_be32(0);
668 di->di_size = cpu_to_be64(0);
669 di->di_blocks = cpu_to_be64(1);
670 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
671 di->di_major = di->di_minor = cpu_to_be32(0);
672 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
673 di->di_generation = cpu_to_be64(*generation);
674 di->di_flags = cpu_to_be32(0);
675
676 if (S_ISREG(mode)) {
677 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
678 gfs2_tune_get(sdp, gt_new_files_jdata))
679 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
680 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
681 gfs2_tune_get(sdp, gt_new_files_directio))
682 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
683 } else if (S_ISDIR(mode)) {
684 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
685 GFS2_DIF_INHERIT_DIRECTIO);
686 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
687 GFS2_DIF_INHERIT_JDATA);
688 }
689
690 di->__pad1 = 0;
691 di->di_payload_format = cpu_to_be32(0);
692 di->di_height = cpu_to_be32(0);
693 di->__pad2 = 0;
694 di->__pad3 = 0;
695 di->di_depth = cpu_to_be16(0);
696 di->di_entries = cpu_to_be32(0);
697 memset(&di->__pad4, 0, sizeof(di->__pad4));
698 di->di_eattr = cpu_to_be64(0);
699 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
700
701 brelse(dibh);
702 }
703
704 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
705 unsigned int mode, const struct gfs2_inum *inum,
706 const u64 *generation)
707 {
708 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
709 unsigned int uid, gid;
710 int error;
711
712 munge_mode_uid_gid(dip, &mode, &uid, &gid);
713 gfs2_alloc_get(dip);
714
715 error = gfs2_quota_lock(dip, uid, gid);
716 if (error)
717 goto out;
718
719 error = gfs2_quota_check(dip, uid, gid);
720 if (error)
721 goto out_quota;
722
723 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
724 if (error)
725 goto out_quota;
726
727 init_dinode(dip, gl, inum, mode, uid, gid, generation);
728 gfs2_quota_change(dip, +1, uid, gid);
729 gfs2_trans_end(sdp);
730
731 out_quota:
732 gfs2_quota_unlock(dip);
733 out:
734 gfs2_alloc_put(dip);
735 return error;
736 }
737
738 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
739 struct gfs2_inode *ip)
740 {
741 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
742 struct gfs2_alloc *al;
743 int alloc_required;
744 struct buffer_head *dibh;
745 int error;
746
747 al = gfs2_alloc_get(dip);
748
749 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
750 if (error)
751 goto fail;
752
753 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
754 if (alloc_required < 0)
755 goto fail;
756 if (alloc_required) {
757 error = gfs2_quota_check(dip, dip->i_di.di_uid,
758 dip->i_di.di_gid);
759 if (error)
760 goto fail_quota_locks;
761
762 al->al_requested = sdp->sd_max_dirres;
763
764 error = gfs2_inplace_reserve(dip);
765 if (error)
766 goto fail_quota_locks;
767
768 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
769 al->al_rgd->rd_ri.ri_length +
770 2 * RES_DINODE +
771 RES_STATFS + RES_QUOTA, 0);
772 if (error)
773 goto fail_ipreserv;
774 } else {
775 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
776 if (error)
777 goto fail_quota_locks;
778 }
779
780 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode));
781 if (error)
782 goto fail_end_trans;
783
784 error = gfs2_meta_inode_buffer(ip, &dibh);
785 if (error)
786 goto fail_end_trans;
787 ip->i_di.di_nlink = 1;
788 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
789 gfs2_dinode_out(&ip->i_di, dibh->b_data);
790 brelse(dibh);
791 return 0;
792
793 fail_end_trans:
794 gfs2_trans_end(sdp);
795
796 fail_ipreserv:
797 if (dip->i_alloc.al_rgd)
798 gfs2_inplace_release(dip);
799
800 fail_quota_locks:
801 gfs2_quota_unlock(dip);
802
803 fail:
804 gfs2_alloc_put(dip);
805 return error;
806 }
807
808 /**
809 * gfs2_createi - Create a new inode
810 * @ghs: An array of two holders
811 * @name: The name of the new file
812 * @mode: the permissions on the new inode
813 *
814 * @ghs[0] is an initialized holder for the directory
815 * @ghs[1] is the holder for the inode lock
816 *
817 * If the return value is not NULL, the glocks on both the directory and the new
818 * file are held. A transaction has been started and an inplace reservation
819 * is held, as well.
820 *
821 * Returns: An inode
822 */
823
824 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
825 unsigned int mode)
826 {
827 struct inode *inode;
828 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
829 struct inode *dir = &dip->i_inode;
830 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
831 struct gfs2_inum inum;
832 int error;
833 u64 generation;
834
835 if (!name->len || name->len > GFS2_FNAMESIZE)
836 return ERR_PTR(-ENAMETOOLONG);
837
838 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
839 error = gfs2_glock_nq(ghs);
840 if (error)
841 goto fail;
842
843 error = create_ok(dip, name, mode);
844 if (error)
845 goto fail_gunlock;
846
847 error = pick_formal_ino(sdp, &inum.no_formal_ino);
848 if (error)
849 goto fail_gunlock;
850
851 error = alloc_dinode(dip, &inum, &generation);
852 if (error)
853 goto fail_gunlock;
854
855 if (inum.no_addr < dip->i_num.no_addr) {
856 gfs2_glock_dq(ghs);
857
858 error = gfs2_glock_nq_num(sdp, inum.no_addr,
859 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
860 GL_SKIP, ghs + 1);
861 if (error) {
862 return ERR_PTR(error);
863 }
864
865 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
866 error = gfs2_glock_nq(ghs);
867 if (error) {
868 gfs2_glock_dq_uninit(ghs + 1);
869 return ERR_PTR(error);
870 }
871
872 error = create_ok(dip, name, mode);
873 if (error)
874 goto fail_gunlock2;
875 } else {
876 error = gfs2_glock_nq_num(sdp, inum.no_addr,
877 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
878 GL_SKIP, ghs + 1);
879 if (error)
880 goto fail_gunlock;
881 }
882
883 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation);
884 if (error)
885 goto fail_gunlock2;
886
887 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
888 if (IS_ERR(inode))
889 goto fail_gunlock2;
890
891 error = gfs2_inode_refresh(GFS2_I(inode));
892 if (error)
893 goto fail_iput;
894
895 error = gfs2_acl_create(dip, GFS2_I(inode));
896 if (error)
897 goto fail_iput;
898
899 error = link_dinode(dip, name, GFS2_I(inode));
900 if (error)
901 goto fail_iput;
902
903 if (!inode)
904 return ERR_PTR(-ENOMEM);
905 return inode;
906
907 fail_iput:
908 iput(inode);
909 fail_gunlock2:
910 gfs2_glock_dq_uninit(ghs + 1);
911 fail_gunlock:
912 gfs2_glock_dq(ghs);
913 fail:
914 return ERR_PTR(error);
915 }
916
917 /**
918 * gfs2_rmdiri - Remove a directory
919 * @dip: The parent directory of the directory to be removed
920 * @name: The name of the directory to be removed
921 * @ip: The GFS2 inode of the directory to be removed
922 *
923 * Assumes Glocks on dip and ip are held
924 *
925 * Returns: errno
926 */
927
928 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
929 struct gfs2_inode *ip)
930 {
931 struct qstr dotname;
932 int error;
933
934 if (ip->i_di.di_entries != 2) {
935 if (gfs2_consist_inode(ip))
936 gfs2_dinode_print(&ip->i_di);
937 return -EIO;
938 }
939
940 error = gfs2_dir_del(dip, name);
941 if (error)
942 return error;
943
944 error = gfs2_change_nlink(dip, -1);
945 if (error)
946 return error;
947
948 gfs2_str2qstr(&dotname, ".");
949 error = gfs2_dir_del(ip, &dotname);
950 if (error)
951 return error;
952
953 gfs2_str2qstr(&dotname, "..");
954 error = gfs2_dir_del(ip, &dotname);
955 if (error)
956 return error;
957
958 error = gfs2_change_nlink(ip, -2);
959 if (error)
960 return error;
961
962 return error;
963 }
964
965 /*
966 * gfs2_unlink_ok - check to see that a inode is still in a directory
967 * @dip: the directory
968 * @name: the name of the file
969 * @ip: the inode
970 *
971 * Assumes that the lock on (at least) @dip is held.
972 *
973 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
974 */
975
976 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
977 struct gfs2_inode *ip)
978 {
979 struct gfs2_inum inum;
980 unsigned int type;
981 int error;
982
983 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
984 return -EPERM;
985
986 if ((dip->i_di.di_mode & S_ISVTX) &&
987 dip->i_di.di_uid != current->fsuid &&
988 ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER))
989 return -EPERM;
990
991 if (IS_APPEND(&dip->i_inode))
992 return -EPERM;
993
994 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
995 if (error)
996 return error;
997
998 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
999 if (error)
1000 return error;
1001
1002 if (!gfs2_inum_equal(&inum, &ip->i_num))
1003 return -ENOENT;
1004
1005 if (IF2DT(ip->i_di.di_mode) != type) {
1006 gfs2_consist_inode(dip);
1007 return -EIO;
1008 }
1009
1010 return 0;
1011 }
1012
1013 /*
1014 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1015 * @this: move this
1016 * @to: to here
1017 *
1018 * Follow @to back to the root and make sure we don't encounter @this
1019 * Assumes we already hold the rename lock.
1020 *
1021 * Returns: errno
1022 */
1023
1024 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1025 {
1026 struct inode *dir = &to->i_inode;
1027 struct super_block *sb = dir->i_sb;
1028 struct inode *tmp;
1029 struct qstr dotdot;
1030 int error = 0;
1031
1032 gfs2_str2qstr(&dotdot, "..");
1033
1034 igrab(dir);
1035
1036 for (;;) {
1037 if (dir == &this->i_inode) {
1038 error = -EINVAL;
1039 break;
1040 }
1041 if (dir == sb->s_root->d_inode) {
1042 error = 0;
1043 break;
1044 }
1045
1046 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1047 if (IS_ERR(tmp)) {
1048 error = PTR_ERR(tmp);
1049 break;
1050 }
1051
1052 iput(dir);
1053 dir = tmp;
1054 }
1055
1056 iput(dir);
1057
1058 return error;
1059 }
1060
1061 /**
1062 * gfs2_readlinki - return the contents of a symlink
1063 * @ip: the symlink's inode
1064 * @buf: a pointer to the buffer to be filled
1065 * @len: a pointer to the length of @buf
1066 *
1067 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1068 * to be freed by the caller.
1069 *
1070 * Returns: errno
1071 */
1072
1073 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1074 {
1075 struct gfs2_holder i_gh;
1076 struct buffer_head *dibh;
1077 unsigned int x;
1078 int error;
1079
1080 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1081 error = gfs2_glock_nq_atime(&i_gh);
1082 if (error) {
1083 gfs2_holder_uninit(&i_gh);
1084 return error;
1085 }
1086
1087 if (!ip->i_di.di_size) {
1088 gfs2_consist_inode(ip);
1089 error = -EIO;
1090 goto out;
1091 }
1092
1093 error = gfs2_meta_inode_buffer(ip, &dibh);
1094 if (error)
1095 goto out;
1096
1097 x = ip->i_di.di_size + 1;
1098 if (x > *len) {
1099 *buf = kmalloc(x, GFP_KERNEL);
1100 if (!*buf) {
1101 error = -ENOMEM;
1102 goto out_brelse;
1103 }
1104 }
1105
1106 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1107 *len = x;
1108
1109 out_brelse:
1110 brelse(dibh);
1111 out:
1112 gfs2_glock_dq_uninit(&i_gh);
1113 return error;
1114 }
1115
1116 /**
1117 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1118 * conditionally update the inode's atime
1119 * @gh: the holder to acquire
1120 *
1121 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1122 * Update if the difference between the current time and the inode's current
1123 * atime is greater than an interval specified at mount.
1124 *
1125 * Returns: errno
1126 */
1127
1128 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1129 {
1130 struct gfs2_glock *gl = gh->gh_gl;
1131 struct gfs2_sbd *sdp = gl->gl_sbd;
1132 struct gfs2_inode *ip = gl->gl_object;
1133 s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1134 unsigned int state;
1135 int flags;
1136 int error;
1137
1138 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1139 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1140 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1141 return -EINVAL;
1142
1143 state = gh->gh_state;
1144 flags = gh->gh_flags;
1145
1146 error = gfs2_glock_nq(gh);
1147 if (error)
1148 return error;
1149
1150 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1151 (sdp->sd_vfs->s_flags & MS_RDONLY))
1152 return 0;
1153
1154 curtime = get_seconds();
1155 if (curtime - ip->i_di.di_atime >= quantum) {
1156 gfs2_glock_dq(gh);
1157 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1158 gh);
1159 error = gfs2_glock_nq(gh);
1160 if (error)
1161 return error;
1162
1163 /* Verify that atime hasn't been updated while we were
1164 trying to get exclusive lock. */
1165
1166 curtime = get_seconds();
1167 if (curtime - ip->i_di.di_atime >= quantum) {
1168 struct buffer_head *dibh;
1169
1170 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1171 if (error == -EROFS)
1172 return 0;
1173 if (error)
1174 goto fail;
1175
1176 error = gfs2_meta_inode_buffer(ip, &dibh);
1177 if (error)
1178 goto fail_end_trans;
1179
1180 ip->i_di.di_atime = curtime;
1181
1182 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1183 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1184 brelse(dibh);
1185
1186 gfs2_trans_end(sdp);
1187 }
1188
1189 /* If someone else has asked for the glock,
1190 unlock and let them have it. Then reacquire
1191 in the original state. */
1192 if (gfs2_glock_is_blocking(gl)) {
1193 gfs2_glock_dq(gh);
1194 gfs2_holder_reinit(state, flags, gh);
1195 return gfs2_glock_nq(gh);
1196 }
1197 }
1198
1199 return 0;
1200
1201 fail_end_trans:
1202 gfs2_trans_end(sdp);
1203 fail:
1204 gfs2_glock_dq(gh);
1205 return error;
1206 }
1207
1208 /**
1209 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1210 * @arg_a: the first structure
1211 * @arg_b: the second structure
1212 *
1213 * Returns: 1 if A > B
1214 * -1 if A < B
1215 * 0 if A == B
1216 */
1217
1218 static int glock_compare_atime(const void *arg_a, const void *arg_b)
1219 {
1220 const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a;
1221 const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b;
1222 const struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1223 const struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1224
1225 if (a->ln_number > b->ln_number)
1226 return 1;
1227 if (a->ln_number < b->ln_number)
1228 return -1;
1229 if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE)
1230 return 1;
1231 if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME))
1232 return 1;
1233
1234 return 0;
1235 }
1236
1237 /**
1238 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1239 * atime update
1240 * @num_gh: the number of structures
1241 * @ghs: an array of struct gfs2_holder structures
1242 *
1243 * Returns: 0 on success (all glocks acquired),
1244 * errno on failure (no glocks acquired)
1245 */
1246
1247 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
1248 {
1249 struct gfs2_holder **p;
1250 unsigned int x;
1251 int error = 0;
1252
1253 if (!num_gh)
1254 return 0;
1255
1256 if (num_gh == 1) {
1257 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1258 if (ghs->gh_flags & GL_ATIME)
1259 error = gfs2_glock_nq_atime(ghs);
1260 else
1261 error = gfs2_glock_nq(ghs);
1262 return error;
1263 }
1264
1265 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
1266 if (!p)
1267 return -ENOMEM;
1268
1269 for (x = 0; x < num_gh; x++)
1270 p[x] = &ghs[x];
1271
1272 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
1273
1274 for (x = 0; x < num_gh; x++) {
1275 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1276
1277 if (p[x]->gh_flags & GL_ATIME)
1278 error = gfs2_glock_nq_atime(p[x]);
1279 else
1280 error = gfs2_glock_nq(p[x]);
1281
1282 if (error) {
1283 while (x--)
1284 gfs2_glock_dq(p[x]);
1285 break;
1286 }
1287 }
1288
1289 kfree(p);
1290 return error;
1291 }
1292
1293
1294 static int
1295 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1296 {
1297 struct buffer_head *dibh;
1298 int error;
1299
1300 error = gfs2_meta_inode_buffer(ip, &dibh);
1301 if (!error) {
1302 error = inode_setattr(&ip->i_inode, attr);
1303 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1304 gfs2_inode_attr_out(ip);
1305
1306 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1307 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1308 brelse(dibh);
1309 }
1310 return error;
1311 }
1312
1313 /**
1314 * gfs2_setattr_simple -
1315 * @ip:
1316 * @attr:
1317 *
1318 * Called with a reference on the vnode.
1319 *
1320 * Returns: errno
1321 */
1322
1323 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1324 {
1325 int error;
1326
1327 if (current->journal_info)
1328 return __gfs2_setattr_simple(ip, attr);
1329
1330 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1331 if (error)
1332 return error;
1333
1334 error = __gfs2_setattr_simple(ip, attr);
1335 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1336 return error;
1337 }
1338
Support for the Chinese Samsung S3C2440 based development boards