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[GFS2] inode_diet: Replace inode.u.generic_ip with inode.i_private (gfs)
[linux-2.6/mini2440.git] / fs / gfs2 / inode.c
blob784d145058cb43ae3cda2611b9a64eb5302ec754
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_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->i_private = 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 struct super_block *sb = dir->i_sb;
391 struct gfs2_inode *dip = GFS2_I(dir);
392 struct gfs2_holder d_gh;
393 struct gfs2_inum inum;
394 unsigned int type;
395 int error = 0;
396 struct inode *inode = NULL;
397
398 if (!name->len || name->len > GFS2_FNAMESIZE)
399 return ERR_PTR(-ENAMETOOLONG);
400
401 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
402 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
403 dir == sb->s_root->d_inode)) {
404 igrab(dir);
405 return dir;
406 }
407
408 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
409 if (error)
410 return ERR_PTR(error);
411
412 if (!is_root) {
413 error = permission(dir, MAY_EXEC, NULL);
414 if (error)
415 goto out;
416 }
417
418 error = gfs2_dir_search(dir, name, &inum, &type);
419 if (error)
420 goto out;
421
422 inode = gfs2_inode_lookup(sb, &inum, type);
423
424 out:
425 gfs2_glock_dq_uninit(&d_gh);
426 if (error == -ENOENT)
427 return NULL;
428 return inode;
429 }
430
431 static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
432 {
433 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
434 struct buffer_head *bh;
435 struct gfs2_inum_range ir;
436 int error;
437
438 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
439 if (error)
440 return error;
441 mutex_lock(&sdp->sd_inum_mutex);
442
443 error = gfs2_meta_inode_buffer(ip, &bh);
444 if (error) {
445 mutex_unlock(&sdp->sd_inum_mutex);
446 gfs2_trans_end(sdp);
447 return error;
448 }
449
450 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
451
452 if (ir.ir_length) {
453 *formal_ino = ir.ir_start++;
454 ir.ir_length--;
455 gfs2_trans_add_bh(ip->i_gl, bh, 1);
456 gfs2_inum_range_out(&ir,
457 bh->b_data + sizeof(struct gfs2_dinode));
458 brelse(bh);
459 mutex_unlock(&sdp->sd_inum_mutex);
460 gfs2_trans_end(sdp);
461 return 0;
462 }
463
464 brelse(bh);
465
466 mutex_unlock(&sdp->sd_inum_mutex);
467 gfs2_trans_end(sdp);
468
469 return 1;
470 }
471
472 static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino)
473 {
474 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
475 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
476 struct gfs2_holder gh;
477 struct buffer_head *bh;
478 struct gfs2_inum_range ir;
479 int error;
480
481 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
482 if (error)
483 return error;
484
485 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
486 if (error)
487 goto out;
488 mutex_lock(&sdp->sd_inum_mutex);
489
490 error = gfs2_meta_inode_buffer(ip, &bh);
491 if (error)
492 goto out_end_trans;
493
494 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
495
496 if (!ir.ir_length) {
497 struct buffer_head *m_bh;
498 u64 x, y;
499
500 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
501 if (error)
502 goto out_brelse;
503
504 x = *(u64 *)(m_bh->b_data + sizeof(struct gfs2_dinode));
505 x = y = be64_to_cpu(x);
506 ir.ir_start = x;
507 ir.ir_length = GFS2_INUM_QUANTUM;
508 x += GFS2_INUM_QUANTUM;
509 if (x < y)
510 gfs2_consist_inode(m_ip);
511 x = cpu_to_be64(x);
512 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
513 *(u64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x;
514
515 brelse(m_bh);
516 }
517
518 *formal_ino = ir.ir_start++;
519 ir.ir_length--;
520
521 gfs2_trans_add_bh(ip->i_gl, bh, 1);
522 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
523
524 out_brelse:
525 brelse(bh);
526 out_end_trans:
527 mutex_unlock(&sdp->sd_inum_mutex);
528 gfs2_trans_end(sdp);
529 out:
530 gfs2_glock_dq_uninit(&gh);
531 return error;
532 }
533
534 static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum)
535 {
536 int error;
537
538 error = pick_formal_ino_1(sdp, inum);
539 if (error <= 0)
540 return error;
541
542 error = pick_formal_ino_2(sdp, inum);
543
544 return error;
545 }
546
547 /**
548 * create_ok - OK to create a new on-disk inode here?
549 * @dip: Directory in which dinode is to be created
550 * @name: Name of new dinode
551 * @mode:
552 *
553 * Returns: errno
554 */
555
556 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
557 unsigned int mode)
558 {
559 int error;
560
561 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
562 if (error)
563 return error;
564
565 /* Don't create entries in an unlinked directory */
566 if (!dip->i_di.di_nlink)
567 return -EPERM;
568
569 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
570 switch (error) {
571 case -ENOENT:
572 error = 0;
573 break;
574 case 0:
575 return -EEXIST;
576 default:
577 return error;
578 }
579
580 if (dip->i_di.di_entries == (u32)-1)
581 return -EFBIG;
582 if (S_ISDIR(mode) && dip->i_di.di_nlink == (u32)-1)
583 return -EMLINK;
584
585 return 0;
586 }
587
588 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
589 unsigned int *uid, unsigned int *gid)
590 {
591 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
592 (dip->i_di.di_mode & S_ISUID) && dip->i_di.di_uid) {
593 if (S_ISDIR(*mode))
594 *mode |= S_ISUID;
595 else if (dip->i_di.di_uid != current->fsuid)
596 *mode &= ~07111;
597 *uid = dip->i_di.di_uid;
598 } else
599 *uid = current->fsuid;
600
601 if (dip->i_di.di_mode & S_ISGID) {
602 if (S_ISDIR(*mode))
603 *mode |= S_ISGID;
604 *gid = dip->i_di.di_gid;
605 } else
606 *gid = current->fsgid;
607 }
608
609 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum *inum,
610 u64 *generation)
611 {
612 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
613 int error;
614
615 gfs2_alloc_get(dip);
616
617 dip->i_alloc.al_requested = RES_DINODE;
618 error = gfs2_inplace_reserve(dip);
619 if (error)
620 goto out;
621
622 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
623 if (error)
624 goto out_ipreserv;
625
626 inum->no_addr = gfs2_alloc_di(dip, generation);
627
628 gfs2_trans_end(sdp);
629
630 out_ipreserv:
631 gfs2_inplace_release(dip);
632 out:
633 gfs2_alloc_put(dip);
634 return error;
635 }
636
637 /**
638 * init_dinode - Fill in a new dinode structure
639 * @dip: the directory this inode is being created in
640 * @gl: The glock covering the new inode
641 * @inum: the inode number
642 * @mode: the file permissions
643 * @uid:
644 * @gid:
645 *
646 */
647
648 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
649 const struct gfs2_inum *inum, unsigned int mode,
650 unsigned int uid, unsigned int gid,
651 const u64 *generation)
652 {
653 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
654 struct gfs2_dinode *di;
655 struct buffer_head *dibh;
656
657 dibh = gfs2_meta_new(gl, inum->no_addr);
658 gfs2_trans_add_bh(gl, dibh, 1);
659 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
660 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
661 di = (struct gfs2_dinode *)dibh->b_data;
662
663 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
664 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
665 di->di_mode = cpu_to_be32(mode);
666 di->di_uid = cpu_to_be32(uid);
667 di->di_gid = cpu_to_be32(gid);
668 di->di_nlink = cpu_to_be32(0);
669 di->di_size = cpu_to_be64(0);
670 di->di_blocks = cpu_to_be64(1);
671 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
672 di->di_major = di->di_minor = cpu_to_be32(0);
673 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
674 di->di_generation = cpu_to_be64(*generation);
675 di->di_flags = cpu_to_be32(0);
676
677 if (S_ISREG(mode)) {
678 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
679 gfs2_tune_get(sdp, gt_new_files_jdata))
680 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
681 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
682 gfs2_tune_get(sdp, gt_new_files_directio))
683 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
684 } else if (S_ISDIR(mode)) {
685 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
686 GFS2_DIF_INHERIT_DIRECTIO);
687 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
688 GFS2_DIF_INHERIT_JDATA);
689 }
690
691 di->__pad1 = 0;
692 di->di_payload_format = cpu_to_be32(0);
693 di->di_height = cpu_to_be32(0);
694 di->__pad2 = 0;
695 di->__pad3 = 0;
696 di->di_depth = cpu_to_be16(0);
697 di->di_entries = cpu_to_be32(0);
698 memset(&di->__pad4, 0, sizeof(di->__pad4));
699 di->di_eattr = cpu_to_be64(0);
700 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
701
702 brelse(dibh);
703 }
704
705 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
706 unsigned int mode, const struct gfs2_inum *inum,
707 const u64 *generation)
708 {
709 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
710 unsigned int uid, gid;
711 int error;
712
713 munge_mode_uid_gid(dip, &mode, &uid, &gid);
714 gfs2_alloc_get(dip);
715
716 error = gfs2_quota_lock(dip, uid, gid);
717 if (error)
718 goto out;
719
720 error = gfs2_quota_check(dip, uid, gid);
721 if (error)
722 goto out_quota;
723
724 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
725 if (error)
726 goto out_quota;
727
728 init_dinode(dip, gl, inum, mode, uid, gid, generation);
729 gfs2_quota_change(dip, +1, uid, gid);
730 gfs2_trans_end(sdp);
731
732 out_quota:
733 gfs2_quota_unlock(dip);
734 out:
735 gfs2_alloc_put(dip);
736 return error;
737 }
738
739 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
740 struct gfs2_inode *ip)
741 {
742 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
743 struct gfs2_alloc *al;
744 int alloc_required;
745 struct buffer_head *dibh;
746 int error;
747
748 al = gfs2_alloc_get(dip);
749
750 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
751 if (error)
752 goto fail;
753
754 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
755 if (alloc_required < 0)
756 goto fail;
757 if (alloc_required) {
758 error = gfs2_quota_check(dip, dip->i_di.di_uid,
759 dip->i_di.di_gid);
760 if (error)
761 goto fail_quota_locks;
762
763 al->al_requested = sdp->sd_max_dirres;
764
765 error = gfs2_inplace_reserve(dip);
766 if (error)
767 goto fail_quota_locks;
768
769 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
770 al->al_rgd->rd_ri.ri_length +
771 2 * RES_DINODE +
772 RES_STATFS + RES_QUOTA, 0);
773 if (error)
774 goto fail_ipreserv;
775 } else {
776 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
777 if (error)
778 goto fail_quota_locks;
779 }
780
781 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode));
782 if (error)
783 goto fail_end_trans;
784
785 error = gfs2_meta_inode_buffer(ip, &dibh);
786 if (error)
787 goto fail_end_trans;
788 ip->i_di.di_nlink = 1;
789 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
790 gfs2_dinode_out(&ip->i_di, dibh->b_data);
791 brelse(dibh);
792 return 0;
793
794 fail_end_trans:
795 gfs2_trans_end(sdp);
796
797 fail_ipreserv:
798 if (dip->i_alloc.al_rgd)
799 gfs2_inplace_release(dip);
800
801 fail_quota_locks:
802 gfs2_quota_unlock(dip);
803
804 fail:
805 gfs2_alloc_put(dip);
806 return error;
807 }
808
809 /**
810 * gfs2_createi - Create a new inode
811 * @ghs: An array of two holders
812 * @name: The name of the new file
813 * @mode: the permissions on the new inode
814 *
815 * @ghs[0] is an initialized holder for the directory
816 * @ghs[1] is the holder for the inode lock
817 *
818 * If the return value is not NULL, the glocks on both the directory and the new
819 * file are held. A transaction has been started and an inplace reservation
820 * is held, as well.
821 *
822 * Returns: An inode
823 */
824
825 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
826 unsigned int mode)
827 {
828 struct inode *inode;
829 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
830 struct inode *dir = &dip->i_inode;
831 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
832 struct gfs2_inum inum;
833 int error;
834 u64 generation;
835
836 if (!name->len || name->len > GFS2_FNAMESIZE)
837 return ERR_PTR(-ENAMETOOLONG);
838
839 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
840 error = gfs2_glock_nq(ghs);
841 if (error)
842 goto fail;
843
844 error = create_ok(dip, name, mode);
845 if (error)
846 goto fail_gunlock;
847
848 error = pick_formal_ino(sdp, &inum.no_formal_ino);
849 if (error)
850 goto fail_gunlock;
851
852 error = alloc_dinode(dip, &inum, &generation);
853 if (error)
854 goto fail_gunlock;
855
856 if (inum.no_addr < dip->i_num.no_addr) {
857 gfs2_glock_dq(ghs);
858
859 error = gfs2_glock_nq_num(sdp, inum.no_addr,
860 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
861 GL_SKIP, ghs + 1);
862 if (error) {
863 return ERR_PTR(error);
864 }
865
866 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
867 error = gfs2_glock_nq(ghs);
868 if (error) {
869 gfs2_glock_dq_uninit(ghs + 1);
870 return ERR_PTR(error);
871 }
872
873 error = create_ok(dip, name, mode);
874 if (error)
875 goto fail_gunlock2;
876 } else {
877 error = gfs2_glock_nq_num(sdp, inum.no_addr,
878 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
879 GL_SKIP, ghs + 1);
880 if (error)
881 goto fail_gunlock;
882 }
883
884 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation);
885 if (error)
886 goto fail_gunlock2;
887
888 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
889 if (IS_ERR(inode))
890 goto fail_gunlock2;
891
892 error = gfs2_inode_refresh(GFS2_I(inode));
893 if (error)
894 goto fail_iput;
895
896 error = gfs2_acl_create(dip, GFS2_I(inode));
897 if (error)
898 goto fail_iput;
899
900 error = link_dinode(dip, name, GFS2_I(inode));
901 if (error)
902 goto fail_iput;
903
904 if (!inode)
905 return ERR_PTR(-ENOMEM);
906 return inode;
907
908 fail_iput:
909 iput(inode);
910 fail_gunlock2:
911 gfs2_glock_dq_uninit(ghs + 1);
912 fail_gunlock:
913 gfs2_glock_dq(ghs);
914 fail:
915 return ERR_PTR(error);
916 }
917
918 /**
919 * gfs2_rmdiri - Remove a directory
920 * @dip: The parent directory of the directory to be removed
921 * @name: The name of the directory to be removed
922 * @ip: The GFS2 inode of the directory to be removed
923 *
924 * Assumes Glocks on dip and ip are held
925 *
926 * Returns: errno
927 */
928
929 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
930 struct gfs2_inode *ip)
931 {
932 struct qstr dotname;
933 int error;
934
935 if (ip->i_di.di_entries != 2) {
936 if (gfs2_consist_inode(ip))
937 gfs2_dinode_print(&ip->i_di);
938 return -EIO;
939 }
940
941 error = gfs2_dir_del(dip, name);
942 if (error)
943 return error;
944
945 error = gfs2_change_nlink(dip, -1);
946 if (error)
947 return error;
948
949 gfs2_str2qstr(&dotname, ".");
950 error = gfs2_dir_del(ip, &dotname);
951 if (error)
952 return error;
953
954 gfs2_str2qstr(&dotname, "..");
955 error = gfs2_dir_del(ip, &dotname);
956 if (error)
957 return error;
958
959 error = gfs2_change_nlink(ip, -2);
960 if (error)
961 return error;
962
963 return error;
964 }
965
966 /*
967 * gfs2_unlink_ok - check to see that a inode is still in a directory
968 * @dip: the directory
969 * @name: the name of the file
970 * @ip: the inode
971 *
972 * Assumes that the lock on (at least) @dip is held.
973 *
974 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
975 */
976
977 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
978 struct gfs2_inode *ip)
979 {
980 struct gfs2_inum inum;
981 unsigned int type;
982 int error;
983
984 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
985 return -EPERM;
986
987 if ((dip->i_di.di_mode & S_ISVTX) &&
988 dip->i_di.di_uid != current->fsuid &&
989 ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER))
990 return -EPERM;
991
992 if (IS_APPEND(&dip->i_inode))
993 return -EPERM;
994
995 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
996 if (error)
997 return error;
998
999 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
1000 if (error)
1001 return error;
1002
1003 if (!gfs2_inum_equal(&inum, &ip->i_num))
1004 return -ENOENT;
1005
1006 if (IF2DT(ip->i_di.di_mode) != type) {
1007 gfs2_consist_inode(dip);
1008 return -EIO;
1009 }
1010
1011 return 0;
1012 }
1013
1014 /*
1015 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1016 * @this: move this
1017 * @to: to here
1018 *
1019 * Follow @to back to the root and make sure we don't encounter @this
1020 * Assumes we already hold the rename lock.
1021 *
1022 * Returns: errno
1023 */
1024
1025 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1026 {
1027 struct inode *dir = &to->i_inode;
1028 struct super_block *sb = dir->i_sb;
1029 struct inode *tmp;
1030 struct qstr dotdot;
1031 int error = 0;
1032
1033 gfs2_str2qstr(&dotdot, "..");
1034
1035 igrab(dir);
1036
1037 for (;;) {
1038 if (dir == &this->i_inode) {
1039 error = -EINVAL;
1040 break;
1041 }
1042 if (dir == sb->s_root->d_inode) {
1043 error = 0;
1044 break;
1045 }
1046
1047 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1048 if (IS_ERR(tmp)) {
1049 error = PTR_ERR(tmp);
1050 break;
1051 }
1052
1053 iput(dir);
1054 dir = tmp;
1055 }
1056
1057 iput(dir);
1058
1059 return error;
1060 }
1061
1062 /**
1063 * gfs2_readlinki - return the contents of a symlink
1064 * @ip: the symlink's inode
1065 * @buf: a pointer to the buffer to be filled
1066 * @len: a pointer to the length of @buf
1067 *
1068 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1069 * to be freed by the caller.
1070 *
1071 * Returns: errno
1072 */
1073
1074 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1075 {
1076 struct gfs2_holder i_gh;
1077 struct buffer_head *dibh;
1078 unsigned int x;
1079 int error;
1080
1081 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1082 error = gfs2_glock_nq_atime(&i_gh);
1083 if (error) {
1084 gfs2_holder_uninit(&i_gh);
1085 return error;
1086 }
1087
1088 if (!ip->i_di.di_size) {
1089 gfs2_consist_inode(ip);
1090 error = -EIO;
1091 goto out;
1092 }
1093
1094 error = gfs2_meta_inode_buffer(ip, &dibh);
1095 if (error)
1096 goto out;
1097
1098 x = ip->i_di.di_size + 1;
1099 if (x > *len) {
1100 *buf = kmalloc(x, GFP_KERNEL);
1101 if (!*buf) {
1102 error = -ENOMEM;
1103 goto out_brelse;
1104 }
1105 }
1106
1107 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1108 *len = x;
1109
1110 out_brelse:
1111 brelse(dibh);
1112 out:
1113 gfs2_glock_dq_uninit(&i_gh);
1114 return error;
1115 }
1116
1117 /**
1118 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1119 * conditionally update the inode's atime
1120 * @gh: the holder to acquire
1121 *
1122 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1123 * Update if the difference between the current time and the inode's current
1124 * atime is greater than an interval specified at mount.
1125 *
1126 * Returns: errno
1127 */
1128
1129 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1130 {
1131 struct gfs2_glock *gl = gh->gh_gl;
1132 struct gfs2_sbd *sdp = gl->gl_sbd;
1133 struct gfs2_inode *ip = gl->gl_object;
1134 s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1135 unsigned int state;
1136 int flags;
1137 int error;
1138
1139 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1140 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1141 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1142 return -EINVAL;
1143
1144 state = gh->gh_state;
1145 flags = gh->gh_flags;
1146
1147 error = gfs2_glock_nq(gh);
1148 if (error)
1149 return error;
1150
1151 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1152 (sdp->sd_vfs->s_flags & MS_RDONLY))
1153 return 0;
1154
1155 curtime = get_seconds();
1156 if (curtime - ip->i_di.di_atime >= quantum) {
1157 gfs2_glock_dq(gh);
1158 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1159 gh);
1160 error = gfs2_glock_nq(gh);
1161 if (error)
1162 return error;
1163
1164 /* Verify that atime hasn't been updated while we were
1165 trying to get exclusive lock. */
1166
1167 curtime = get_seconds();
1168 if (curtime - ip->i_di.di_atime >= quantum) {
1169 struct buffer_head *dibh;
1170
1171 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1172 if (error == -EROFS)
1173 return 0;
1174 if (error)
1175 goto fail;
1176
1177 error = gfs2_meta_inode_buffer(ip, &dibh);
1178 if (error)
1179 goto fail_end_trans;
1180
1181 ip->i_di.di_atime = curtime;
1182
1183 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1184 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1185 brelse(dibh);
1186
1187 gfs2_trans_end(sdp);
1188 }
1189
1190 /* If someone else has asked for the glock,
1191 unlock and let them have it. Then reacquire
1192 in the original state. */
1193 if (gfs2_glock_is_blocking(gl)) {
1194 gfs2_glock_dq(gh);
1195 gfs2_holder_reinit(state, flags, gh);
1196 return gfs2_glock_nq(gh);
1197 }
1198 }
1199
1200 return 0;
1201
1202 fail_end_trans:
1203 gfs2_trans_end(sdp);
1204 fail:
1205 gfs2_glock_dq(gh);
1206 return error;
1207 }
1208
1209 /**
1210 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1211 * @arg_a: the first structure
1212 * @arg_b: the second structure
1213 *
1214 * Returns: 1 if A > B
1215 * -1 if A < B
1216 * 0 if A == B
1217 */
1218
1219 static int glock_compare_atime(const void *arg_a, const void *arg_b)
1220 {
1221 const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a;
1222 const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b;
1223 const struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1224 const struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1225
1226 if (a->ln_number > b->ln_number)
1227 return 1;
1228 if (a->ln_number < b->ln_number)
1229 return -1;
1230 if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE)
1231 return 1;
1232 if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME))
1233 return 1;
1234
1235 return 0;
1236 }
1237
1238 /**
1239 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1240 * atime update
1241 * @num_gh: the number of structures
1242 * @ghs: an array of struct gfs2_holder structures
1243 *
1244 * Returns: 0 on success (all glocks acquired),
1245 * errno on failure (no glocks acquired)
1246 */
1247
1248 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
1249 {
1250 struct gfs2_holder **p;
1251 unsigned int x;
1252 int error = 0;
1253
1254 if (!num_gh)
1255 return 0;
1256
1257 if (num_gh == 1) {
1258 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1259 if (ghs->gh_flags & GL_ATIME)
1260 error = gfs2_glock_nq_atime(ghs);
1261 else
1262 error = gfs2_glock_nq(ghs);
1263 return error;
1264 }
1265
1266 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
1267 if (!p)
1268 return -ENOMEM;
1269
1270 for (x = 0; x < num_gh; x++)
1271 p[x] = &ghs[x];
1272
1273 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
1274
1275 for (x = 0; x < num_gh; x++) {
1276 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1277
1278 if (p[x]->gh_flags & GL_ATIME)
1279 error = gfs2_glock_nq_atime(p[x]);
1280 else
1281 error = gfs2_glock_nq(p[x]);
1282
1283 if (error) {
1284 while (x--)
1285 gfs2_glock_dq(p[x]);
1286 break;
1287 }
1288 }
1289
1290 kfree(p);
1291 return error;
1292 }
1293
1294
1295 static int
1296 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1297 {
1298 struct buffer_head *dibh;
1299 int error;
1300
1301 error = gfs2_meta_inode_buffer(ip, &dibh);
1302 if (!error) {
1303 error = inode_setattr(&ip->i_inode, attr);
1304 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1305 gfs2_inode_attr_out(ip);
1306
1307 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1308 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1309 brelse(dibh);
1310 }
1311 return error;
1312 }
1313
1314 /**
1315 * gfs2_setattr_simple -
1316 * @ip:
1317 * @attr:
1318 *
1319 * Called with a reference on the vnode.
1320 *
1321 * Returns: errno
1322 */
1323
1324 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1325 {
1326 int error;
1327
1328 if (current->journal_info)
1329 return __gfs2_setattr_simple(ip, attr);
1330
1331 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1332 if (error)
1333 return error;
1334
1335 error = __gfs2_setattr_simple(ip, attr);
1336 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1337 return error;
1338 }
1339
Support for the Chinese Samsung S3C2440 based development boards