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-rw-r--r--fs/gfs2/inode.c1354
1 files changed, 1354 insertions, 0 deletions
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
new file mode 100644
index 000000000000..e76f345517b7
--- /dev/null
+++ b/fs/gfs2/inode.c
@@ -0,0 +1,1354 @@
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 v.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
47void gfs2_inode_attr_in(struct gfs2_inode *ip)
48{
49 struct inode *inode = &ip->i_inode;
50
51 inode->i_ino = ip->i_num.no_addr;
52
53 switch (ip->i_di.di_mode & S_IFMT) {
54 case S_IFBLK:
55 case S_IFCHR:
56 inode->i_rdev = MKDEV(ip->i_di.di_major, ip->i_di.di_minor);
57 break;
58 default:
59 inode->i_rdev = 0;
60 break;
61 };
62
63 inode->i_mode = ip->i_di.di_mode;
64 inode->i_nlink = ip->i_di.di_nlink;
65 inode->i_uid = ip->i_di.di_uid;
66 inode->i_gid = ip->i_di.di_gid;
67 i_size_write(inode, ip->i_di.di_size);
68 inode->i_atime.tv_sec = ip->i_di.di_atime;
69 inode->i_mtime.tv_sec = ip->i_di.di_mtime;
70 inode->i_ctime.tv_sec = ip->i_di.di_ctime;
71 inode->i_atime.tv_nsec = 0;
72 inode->i_mtime.tv_nsec = 0;
73 inode->i_ctime.tv_nsec = 0;
74 inode->i_blksize = PAGE_SIZE;
75 inode->i_blocks = ip->i_di.di_blocks <<
76 (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
77
78 if (ip->i_di.di_flags & GFS2_DIF_IMMUTABLE)
79 inode->i_flags |= S_IMMUTABLE;
80 else
81 inode->i_flags &= ~S_IMMUTABLE;
82
83 if (ip->i_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
97void gfs2_inode_attr_out(struct gfs2_inode *ip)
98{
99 struct inode *inode = &ip->i_inode;
100
101 gfs2_assert_withdraw(GFS2_SB(inode),
102 (ip->i_di.di_mode & S_IFMT) == (inode->i_mode & S_IFMT));
103 ip->i_di.di_mode = inode->i_mode;
104 ip->i_di.di_uid = inode->i_uid;
105 ip->i_di.di_gid = inode->i_gid;
106 ip->i_di.di_atime = inode->i_atime.tv_sec;
107 ip->i_di.di_mtime = inode->i_mtime.tv_sec;
108 ip->i_di.di_ctime = inode->i_ctime.tv_sec;
109}
110
111static 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
122static 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
131struct 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
137static 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
152struct 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->u.generic_ip = 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;
197fail_iopen:
198 gfs2_glock_put(io_gl);
199fail_put:
200 ip->i_gl->gl_object = NULL;
201 gfs2_glock_put(ip->i_gl);
202fail:
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
214int 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
245int 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 +
281 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
292out_rg_gunlock:
293 gfs2_glock_dq_uninit(&al->al_rgd_gh);
294out_rindex_relse:
295 gfs2_glock_dq_uninit(&al->al_ri_gh);
296out_qs:
297 gfs2_quota_unhold(ip);
298out:
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
311int 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 uint32_t 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);
359out_norgrp:
360 gfs2_glock_dq_uninit(&ri_gh);
361 }
362out:
363 return error;
364}
365
366struct 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
387struct 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
425out:
426 gfs2_glock_dq_uninit(&d_gh);
427 if (error == -ENOENT)
428 return NULL;
429 return inode;
430}
431
432static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *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
473static int pick_formal_ino_2(struct gfs2_sbd *sdp, uint64_t *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 uint64_t x, y;
500
501 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
502 if (error)
503 goto out_brelse;
504
505 x = *(uint64_t *)(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 *(uint64_t *)(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
528 out_end_trans:
529 mutex_unlock(&sdp->sd_inum_mutex);
530 gfs2_trans_end(sdp);
531
532 out:
533 gfs2_glock_dq_uninit(&gh);
534
535 return error;
536}
537
538static int pick_formal_ino(struct gfs2_sbd *sdp, uint64_t *inum)
539{
540 int error;
541
542 error = pick_formal_ino_1(sdp, inum);
543 if (error <= 0)
544 return error;
545
546 error = pick_formal_ino_2(sdp, inum);
547
548 return error;
549}
550
551/**
552 * create_ok - OK to create a new on-disk inode here?
553 * @dip: Directory in which dinode is to be created
554 * @name: Name of new dinode
555 * @mode:
556 *
557 * Returns: errno
558 */
559
560static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
561 unsigned int mode)
562{
563 int error;
564
565 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
566 if (error)
567 return error;
568
569 /* Don't create entries in an unlinked directory */
570 if (!dip->i_di.di_nlink)
571 return -EPERM;
572
573 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
574 switch (error) {
575 case -ENOENT:
576 error = 0;
577 break;
578 case 0:
579 return -EEXIST;
580 default:
581 return error;
582 }
583
584 if (dip->i_di.di_entries == (uint32_t)-1)
585 return -EFBIG;
586 if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-1)
587 return -EMLINK;
588
589 return 0;
590}
591
592static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
593 unsigned int *uid, unsigned int *gid)
594{
595 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
596 (dip->i_di.di_mode & S_ISUID) &&
597 dip->i_di.di_uid) {
598 if (S_ISDIR(*mode))
599 *mode |= S_ISUID;
600 else if (dip->i_di.di_uid != current->fsuid)
601 *mode &= ~07111;
602 *uid = dip->i_di.di_uid;
603 } else
604 *uid = current->fsuid;
605
606 if (dip->i_di.di_mode & S_ISGID) {
607 if (S_ISDIR(*mode))
608 *mode |= S_ISGID;
609 *gid = dip->i_di.di_gid;
610 } else
611 *gid = current->fsgid;
612}
613
614static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum *inum,
615 u64 *generation)
616{
617 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
618 int error;
619
620 gfs2_alloc_get(dip);
621
622 dip->i_alloc.al_requested = RES_DINODE;
623 error = gfs2_inplace_reserve(dip);
624 if (error)
625 goto out;
626
627 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
628 if (error)
629 goto out_ipreserv;
630
631 inum->no_addr = gfs2_alloc_di(dip, generation);
632
633 gfs2_trans_end(sdp);
634
635out_ipreserv:
636 gfs2_inplace_release(dip);
637
638out:
639 gfs2_alloc_put(dip);
640
641 return error;
642}
643
644/**
645 * init_dinode - Fill in a new dinode structure
646 * @dip: the directory this inode is being created in
647 * @gl: The glock covering the new inode
648 * @inum: the inode number
649 * @mode: the file permissions
650 * @uid:
651 * @gid:
652 *
653 */
654
655static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
656 const struct gfs2_inum *inum, unsigned int mode,
657 unsigned int uid, unsigned int gid,
658 const u64 *generation)
659{
660 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
661 struct gfs2_dinode *di;
662 struct buffer_head *dibh;
663
664 dibh = gfs2_meta_new(gl, inum->no_addr);
665 gfs2_trans_add_bh(gl, dibh, 1);
666 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
667 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
668 di = (struct gfs2_dinode *)dibh->b_data;
669
670 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
671 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
672 di->di_mode = cpu_to_be32(mode);
673 di->di_uid = cpu_to_be32(uid);
674 di->di_gid = cpu_to_be32(gid);
675 di->di_nlink = cpu_to_be32(0);
676 di->di_size = cpu_to_be64(0);
677 di->di_blocks = cpu_to_be64(1);
678 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
679 di->di_major = di->di_minor = cpu_to_be32(0);
680 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
681 di->di_generation = cpu_to_be64(*generation);
682 di->di_flags = cpu_to_be32(0);
683
684 if (S_ISREG(mode)) {
685 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
686 gfs2_tune_get(sdp, gt_new_files_jdata))
687 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
688 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
689 gfs2_tune_get(sdp, gt_new_files_directio))
690 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
691 } else if (S_ISDIR(mode)) {
692 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
693 GFS2_DIF_INHERIT_DIRECTIO);
694 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
695 GFS2_DIF_INHERIT_JDATA);
696 }
697
698 di->__pad1 = 0;
699 di->di_payload_format = cpu_to_be32(0);
700 di->di_height = cpu_to_be32(0);
701 di->__pad2 = 0;
702 di->__pad3 = 0;
703 di->di_depth = cpu_to_be16(0);
704 di->di_entries = cpu_to_be32(0);
705 memset(&di->__pad4, 0, sizeof(di->__pad4));
706 di->di_eattr = cpu_to_be64(0);
707 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
708
709 brelse(dibh);
710}
711
712static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
713 unsigned int mode, const struct gfs2_inum *inum,
714 const u64 *generation)
715{
716 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
717 unsigned int uid, gid;
718 int error;
719
720 munge_mode_uid_gid(dip, &mode, &uid, &gid);
721 gfs2_alloc_get(dip);
722
723 error = gfs2_quota_lock(dip, uid, gid);
724 if (error)
725 goto out;
726
727 error = gfs2_quota_check(dip, uid, gid);
728 if (error)
729 goto out_quota;
730
731 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
732 if (error)
733 goto out_quota;
734
735 init_dinode(dip, gl, inum, mode, uid, gid, generation);
736 gfs2_quota_change(dip, +1, uid, gid);
737 gfs2_trans_end(sdp);
738
739out_quota:
740 gfs2_quota_unlock(dip);
741out:
742 gfs2_alloc_put(dip);
743 return error;
744}
745
746static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
747 struct gfs2_inode *ip)
748{
749 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
750 struct gfs2_alloc *al;
751 int alloc_required;
752 struct buffer_head *dibh;
753 int error;
754
755 al = gfs2_alloc_get(dip);
756
757 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
758 if (error)
759 goto fail;
760
761 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
762 if (alloc_required < 0)
763 goto fail;
764 if (alloc_required) {
765 error = gfs2_quota_check(dip, dip->i_di.di_uid,
766 dip->i_di.di_gid);
767 if (error)
768 goto fail_quota_locks;
769
770 al->al_requested = sdp->sd_max_dirres;
771
772 error = gfs2_inplace_reserve(dip);
773 if (error)
774 goto fail_quota_locks;
775
776 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
777 al->al_rgd->rd_ri.ri_length +
778 2 * RES_DINODE +
779 RES_STATFS + RES_QUOTA, 0);
780 if (error)
781 goto fail_ipreserv;
782 } else {
783 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
784 if (error)
785 goto fail_quota_locks;
786 }
787
788 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode));
789 if (error)
790 goto fail_end_trans;
791
792 error = gfs2_meta_inode_buffer(ip, &dibh);
793 if (error)
794 goto fail_end_trans;
795 ip->i_di.di_nlink = 1;
796 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
797 gfs2_dinode_out(&ip->i_di, dibh->b_data);
798 brelse(dibh);
799 return 0;
800
801fail_end_trans:
802 gfs2_trans_end(sdp);
803
804fail_ipreserv:
805 if (dip->i_alloc.al_rgd)
806 gfs2_inplace_release(dip);
807
808fail_quota_locks:
809 gfs2_quota_unlock(dip);
810
811fail:
812 gfs2_alloc_put(dip);
813 return error;
814}
815
816/**
817 * gfs2_createi - Create a new inode
818 * @ghs: An array of two holders
819 * @name: The name of the new file
820 * @mode: the permissions on the new inode
821 *
822 * @ghs[0] is an initialized holder for the directory
823 * @ghs[1] is the holder for the inode lock
824 *
825 * If the return value is not NULL, the glocks on both the directory and the new
826 * file are held. A transaction has been started and an inplace reservation
827 * is held, as well.
828 *
829 * Returns: An inode
830 */
831
832struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
833 unsigned int mode)
834{
835 struct inode *inode;
836 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
837 struct inode *dir = &dip->i_inode;
838 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
839 struct gfs2_inum inum;
840 int error;
841 u64 generation;
842
843 if (!name->len || name->len > GFS2_FNAMESIZE)
844 return ERR_PTR(-ENAMETOOLONG);
845
846 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
847 error = gfs2_glock_nq(ghs);
848 if (error)
849 goto fail;
850
851 error = create_ok(dip, name, mode);
852 if (error)
853 goto fail_gunlock;
854
855 error = pick_formal_ino(sdp, &inum.no_formal_ino);
856 if (error)
857 goto fail_gunlock;
858
859 error = alloc_dinode(dip, &inum, &generation);
860 if (error)
861 goto fail_gunlock;
862
863 if (inum.no_addr < dip->i_num.no_addr) {
864 gfs2_glock_dq(ghs);
865
866 error = gfs2_glock_nq_num(sdp, inum.no_addr,
867 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
868 GL_SKIP, ghs + 1);
869 if (error) {
870 return ERR_PTR(error);
871 }
872
873 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
874 error = gfs2_glock_nq(ghs);
875 if (error) {
876 gfs2_glock_dq_uninit(ghs + 1);
877 return ERR_PTR(error);
878 }
879
880 error = create_ok(dip, name, mode);
881 if (error)
882 goto fail_gunlock2;
883 } else {
884 error = gfs2_glock_nq_num(sdp, inum.no_addr,
885 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
886 GL_SKIP, ghs + 1);
887 if (error)
888 goto fail_gunlock;
889 }
890
891 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation);
892 if (error)
893 goto fail_gunlock2;
894
895 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
896 if (IS_ERR(inode))
897 goto fail_gunlock2;
898
899 error = gfs2_inode_refresh(GFS2_I(inode));
900 if (error)
901 goto fail_iput;
902
903 error = gfs2_acl_create(dip, GFS2_I(inode));
904 if (error)
905 goto fail_iput;
906
907 error = link_dinode(dip, name, GFS2_I(inode));
908 if (error)
909 goto fail_iput;
910
911 if (!inode)
912 return ERR_PTR(-ENOMEM);
913 return inode;
914
915fail_iput:
916 iput(inode);
917fail_gunlock2:
918 gfs2_glock_dq_uninit(ghs + 1);
919fail_gunlock:
920 gfs2_glock_dq(ghs);
921fail:
922 return ERR_PTR(error);
923}
924
925/**
926 * gfs2_rmdiri - Remove a directory
927 * @dip: The parent directory of the directory to be removed
928 * @name: The name of the directory to be removed
929 * @ip: The GFS2 inode of the directory to be removed
930 *
931 * Assumes Glocks on dip and ip are held
932 *
933 * Returns: errno
934 */
935
936int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
937 struct gfs2_inode *ip)
938{
939 struct qstr dotname;
940 int error;
941
942 if (ip->i_di.di_entries != 2) {
943 if (gfs2_consist_inode(ip))
944 gfs2_dinode_print(&ip->i_di);
945 return -EIO;
946 }
947
948 error = gfs2_dir_del(dip, name);
949 if (error)
950 return error;
951
952 error = gfs2_change_nlink(dip, -1);
953 if (error)
954 return error;
955
956 gfs2_str2qstr(&dotname, ".");
957 error = gfs2_dir_del(ip, &dotname);
958 if (error)
959 return error;
960
961 gfs2_str2qstr(&dotname, "..");
962 error = gfs2_dir_del(ip, &dotname);
963 if (error)
964 return error;
965
966 error = gfs2_change_nlink(ip, -2);
967 if (error)
968 return error;
969
970 return error;
971}
972
973/*
974 * gfs2_unlink_ok - check to see that a inode is still in a directory
975 * @dip: the directory
976 * @name: the name of the file
977 * @ip: the inode
978 *
979 * Assumes that the lock on (at least) @dip is held.
980 *
981 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
982 */
983
984int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
985 struct gfs2_inode *ip)
986{
987 struct gfs2_inum inum;
988 unsigned int type;
989 int error;
990
991 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
992 return -EPERM;
993
994 if ((dip->i_di.di_mode & S_ISVTX) &&
995 dip->i_di.di_uid != current->fsuid &&
996 ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER))
997 return -EPERM;
998
999 if (IS_APPEND(&dip->i_inode))
1000 return -EPERM;
1001
1002 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
1003 if (error)
1004 return error;
1005
1006 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
1007 if (error)
1008 return error;
1009
1010 if (!gfs2_inum_equal(&inum, &ip->i_num))
1011 return -ENOENT;
1012
1013 if (IF2DT(ip->i_di.di_mode) != type) {
1014 gfs2_consist_inode(dip);
1015 return -EIO;
1016 }
1017
1018 return 0;
1019}
1020
1021/*
1022 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1023 * @this: move this
1024 * @to: to here
1025 *
1026 * Follow @to back to the root and make sure we don't encounter @this
1027 * Assumes we already hold the rename lock.
1028 *
1029 * Returns: errno
1030 */
1031
1032int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1033{
1034 struct inode *dir = &to->i_inode;
1035 struct super_block *sb = dir->i_sb;
1036 struct inode *tmp;
1037 struct qstr dotdot;
1038 int error = 0;
1039
1040 gfs2_str2qstr(&dotdot, "..");
1041
1042 igrab(dir);
1043
1044 for (;;) {
1045 if (dir == &this->i_inode) {
1046 error = -EINVAL;
1047 break;
1048 }
1049 if (dir == sb->s_root->d_inode) {
1050 error = 0;
1051 break;
1052 }
1053
1054 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1055 if (IS_ERR(tmp)) {
1056 error = PTR_ERR(tmp);
1057 break;
1058 }
1059
1060 iput(dir);
1061 dir = tmp;
1062 }
1063
1064 iput(dir);
1065
1066 return error;
1067}
1068
1069/**
1070 * gfs2_readlinki - return the contents of a symlink
1071 * @ip: the symlink's inode
1072 * @buf: a pointer to the buffer to be filled
1073 * @len: a pointer to the length of @buf
1074 *
1075 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1076 * to be freed by the caller.
1077 *
1078 * Returns: errno
1079 */
1080
1081int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1082{
1083 struct gfs2_holder i_gh;
1084 struct buffer_head *dibh;
1085 unsigned int x;
1086 int error;
1087
1088 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1089 error = gfs2_glock_nq_atime(&i_gh);
1090 if (error) {
1091 gfs2_holder_uninit(&i_gh);
1092 return error;
1093 }
1094
1095 if (!ip->i_di.di_size) {
1096 gfs2_consist_inode(ip);
1097 error = -EIO;
1098 goto out;
1099 }
1100
1101 error = gfs2_meta_inode_buffer(ip, &dibh);
1102 if (error)
1103 goto out;
1104
1105 x = ip->i_di.di_size + 1;
1106 if (x > *len) {
1107 *buf = kmalloc(x, GFP_KERNEL);
1108 if (!*buf) {
1109 error = -ENOMEM;
1110 goto out_brelse;
1111 }
1112 }
1113
1114 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1115 *len = x;
1116
1117out_brelse:
1118 brelse(dibh);
1119out:
1120 gfs2_glock_dq_uninit(&i_gh);
1121 return error;
1122}
1123
1124/**
1125 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1126 * conditionally update the inode's atime
1127 * @gh: the holder to acquire
1128 *
1129 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1130 * Update if the difference between the current time and the inode's current
1131 * atime is greater than an interval specified at mount.
1132 *
1133 * Returns: errno
1134 */
1135
1136int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1137{
1138 struct gfs2_glock *gl = gh->gh_gl;
1139 struct gfs2_sbd *sdp = gl->gl_sbd;
1140 struct gfs2_inode *ip = gl->gl_object;
1141 int64_t curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1142 unsigned int state;
1143 int flags;
1144 int error;
1145
1146 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1147 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1148 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1149 return -EINVAL;
1150
1151 state = gh->gh_state;
1152 flags = gh->gh_flags;
1153
1154 error = gfs2_glock_nq(gh);
1155 if (error)
1156 return error;
1157
1158 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1159 (sdp->sd_vfs->s_flags & MS_RDONLY))
1160 return 0;
1161
1162 curtime = get_seconds();
1163 if (curtime - ip->i_di.di_atime >= quantum) {
1164 gfs2_glock_dq(gh);
1165 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1166 gh);
1167 error = gfs2_glock_nq(gh);
1168 if (error)
1169 return error;
1170
1171 /* Verify that atime hasn't been updated while we were
1172 trying to get exclusive lock. */
1173
1174 curtime = get_seconds();
1175 if (curtime - ip->i_di.di_atime >= quantum) {
1176 struct buffer_head *dibh;
1177
1178 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1179 if (error == -EROFS)
1180 return 0;
1181 if (error)
1182 goto fail;
1183
1184 error = gfs2_meta_inode_buffer(ip, &dibh);
1185 if (error)
1186 goto fail_end_trans;
1187
1188 ip->i_di.di_atime = curtime;
1189
1190 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1191 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1192 brelse(dibh);
1193
1194 gfs2_trans_end(sdp);
1195 }
1196
1197 /* If someone else has asked for the glock,
1198 unlock and let them have it. Then reacquire
1199 in the original state. */
1200 if (gfs2_glock_is_blocking(gl)) {
1201 gfs2_glock_dq(gh);
1202 gfs2_holder_reinit(state, flags, gh);
1203 return gfs2_glock_nq(gh);
1204 }
1205 }
1206
1207 return 0;
1208
1209fail_end_trans:
1210 gfs2_trans_end(sdp);
1211fail:
1212 gfs2_glock_dq(gh);
1213 return error;
1214}
1215
1216/**
1217 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1218 * @arg_a: the first structure
1219 * @arg_b: the second structure
1220 *
1221 * Returns: 1 if A > B
1222 * -1 if A < B
1223 * 0 if A = B
1224 */
1225
1226static int glock_compare_atime(const void *arg_a, const void *arg_b)
1227{
1228 struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a;
1229 struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b;
1230 struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1231 struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1232 int ret = 0;
1233
1234 if (a->ln_number > b->ln_number)
1235 ret = 1;
1236 else if (a->ln_number < b->ln_number)
1237 ret = -1;
1238 else {
1239 if (gh_a->gh_state == LM_ST_SHARED &&
1240 gh_b->gh_state == LM_ST_EXCLUSIVE)
1241 ret = 1;
1242 else if (gh_a->gh_state == LM_ST_SHARED &&
1243 (gh_b->gh_flags & GL_ATIME))
1244 ret = 1;
1245 }
1246
1247 return ret;
1248}
1249
1250/**
1251 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1252 * atime update
1253 * @num_gh: the number of structures
1254 * @ghs: an array of struct gfs2_holder structures
1255 *
1256 * Returns: 0 on success (all glocks acquired),
1257 * errno on failure (no glocks acquired)
1258 */
1259
1260int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
1261{
1262 struct gfs2_holder **p;
1263 unsigned int x;
1264 int error = 0;
1265
1266 if (!num_gh)
1267 return 0;
1268
1269 if (num_gh == 1) {
1270 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1271 if (ghs->gh_flags & GL_ATIME)
1272 error = gfs2_glock_nq_atime(ghs);
1273 else
1274 error = gfs2_glock_nq(ghs);
1275 return error;
1276 }
1277
1278 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
1279 if (!p)
1280 return -ENOMEM;
1281
1282 for (x = 0; x < num_gh; x++)
1283 p[x] = &ghs[x];
1284
1285 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
1286
1287 for (x = 0; x < num_gh; x++) {
1288 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1289
1290 if (p[x]->gh_flags & GL_ATIME)
1291 error = gfs2_glock_nq_atime(p[x]);
1292 else
1293 error = gfs2_glock_nq(p[x]);
1294
1295 if (error) {
1296 while (x--)
1297 gfs2_glock_dq(p[x]);
1298 break;
1299 }
1300 }
1301
1302 kfree(p);
1303
1304 return error;
1305}
1306
1307
1308static int
1309__gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1310{
1311 struct buffer_head *dibh;
1312 int error;
1313
1314 error = gfs2_meta_inode_buffer(ip, &dibh);
1315 if (!error) {
1316 error = inode_setattr(&ip->i_inode, attr);
1317 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1318 gfs2_inode_attr_out(ip);
1319
1320 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1321 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1322 brelse(dibh);
1323 }
1324 return error;
1325}
1326
1327/**
1328 * gfs2_setattr_simple -
1329 * @ip:
1330 * @attr:
1331 *
1332 * Called with a reference on the vnode.
1333 *
1334 * Returns: errno
1335 */
1336
1337int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1338{
1339 int error;
1340
1341 if (current->journal_info)
1342 return __gfs2_setattr_simple(ip, attr);
1343
1344 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1345 if (error)
1346 return error;
1347
1348 error = __gfs2_setattr_simple(ip, attr);
1349
1350 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1351
1352 return error;
1353}
1354
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-30 12:37:29 -0500