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10#include <linux/slab.h>
11#include <linux/spinlock.h>
12#include <linux/completion.h>
13#include <linux/buffer_head.h>
14#include <linux/namei.h>
15#include <linux/mm.h>
16#include <linux/xattr.h>
17#include <linux/posix_acl.h>
18#include <linux/gfs2_ondisk.h>
19#include <linux/crc32.h>
20#include <linux/fiemap.h>
21#include <linux/security.h>
22#include <asm/uaccess.h>
23
24#include "gfs2.h"
25#include "incore.h"
26#include "acl.h"
27#include "bmap.h"
28#include "dir.h"
29#include "xattr.h"
30#include "glock.h"
31#include "inode.h"
32#include "meta_io.h"
33#include "quota.h"
34#include "rgrp.h"
35#include "trans.h"
36#include "util.h"
37#include "super.h"
38#include "glops.h"
39
40struct gfs2_skip_data {
41 u64 no_addr;
42 int skipped;
43 int non_block;
44};
45
46static int iget_test(struct inode *inode, void *opaque)
47{
48 struct gfs2_inode *ip = GFS2_I(inode);
49 struct gfs2_skip_data *data = opaque;
50
51 if (ip->i_no_addr == data->no_addr) {
52 if (data->non_block &&
53 inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
54 data->skipped = 1;
55 return 0;
56 }
57 return 1;
58 }
59 return 0;
60}
61
62static int iget_set(struct inode *inode, void *opaque)
63{
64 struct gfs2_inode *ip = GFS2_I(inode);
65 struct gfs2_skip_data *data = opaque;
66
67 if (data->skipped)
68 return -ENOENT;
69 inode->i_ino = (unsigned long)(data->no_addr);
70 ip->i_no_addr = data->no_addr;
71 return 0;
72}
73
74struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block)
75{
76 unsigned long hash = (unsigned long)no_addr;
77 struct gfs2_skip_data data;
78
79 data.no_addr = no_addr;
80 data.skipped = 0;
81 data.non_block = non_block;
82 return ilookup5(sb, hash, iget_test, &data);
83}
84
85static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr,
86 int non_block)
87{
88 struct gfs2_skip_data data;
89 unsigned long hash = (unsigned long)no_addr;
90
91 data.no_addr = no_addr;
92 data.skipped = 0;
93 data.non_block = non_block;
94 return iget5_locked(sb, hash, iget_test, iget_set, &data);
95}
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101
102
103
104
105static void gfs2_set_iop(struct inode *inode)
106{
107 struct gfs2_sbd *sdp = GFS2_SB(inode);
108 umode_t mode = inode->i_mode;
109
110 if (S_ISREG(mode)) {
111 inode->i_op = &gfs2_file_iops;
112 if (gfs2_localflocks(sdp))
113 inode->i_fop = &gfs2_file_fops_nolock;
114 else
115 inode->i_fop = &gfs2_file_fops;
116 } else if (S_ISDIR(mode)) {
117 inode->i_op = &gfs2_dir_iops;
118 if (gfs2_localflocks(sdp))
119 inode->i_fop = &gfs2_dir_fops_nolock;
120 else
121 inode->i_fop = &gfs2_dir_fops;
122 } else if (S_ISLNK(mode)) {
123 inode->i_op = &gfs2_symlink_iops;
124 } else {
125 inode->i_op = &gfs2_file_iops;
126 init_special_inode(inode, inode->i_mode, inode->i_rdev);
127 }
128}
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137
138
139
140struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
141 u64 no_addr, u64 no_formal_ino, int non_block)
142{
143 struct inode *inode;
144 struct gfs2_inode *ip;
145 struct gfs2_glock *io_gl = NULL;
146 int error;
147
148 inode = gfs2_iget(sb, no_addr, non_block);
149 ip = GFS2_I(inode);
150
151 if (!inode)
152 return ERR_PTR(-ENOMEM);
153
154 if (inode->i_state & I_NEW) {
155 struct gfs2_sbd *sdp = GFS2_SB(inode);
156 ip->i_no_formal_ino = no_formal_ino;
157
158 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
159 if (unlikely(error))
160 goto fail;
161 ip->i_gl->gl_object = ip;
162
163 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
164 if (unlikely(error))
165 goto fail_put;
166
167 set_bit(GIF_INVALID, &ip->i_flags);
168 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
169 if (unlikely(error))
170 goto fail_iopen;
171
172 ip->i_iopen_gh.gh_gl->gl_object = ip;
173 gfs2_glock_put(io_gl);
174 io_gl = NULL;
175
176 if (type == DT_UNKNOWN) {
177
178 error = gfs2_inode_refresh(GFS2_I(inode));
179 if (error)
180 goto fail_refresh;
181 } else {
182 inode->i_mode = DT2IF(type);
183 }
184
185 gfs2_set_iop(inode);
186 unlock_new_inode(inode);
187 }
188
189 return inode;
190
191fail_refresh:
192 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
193 ip->i_iopen_gh.gh_gl->gl_object = NULL;
194 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
195fail_iopen:
196 if (io_gl)
197 gfs2_glock_put(io_gl);
198fail_put:
199 ip->i_gl->gl_object = NULL;
200 gfs2_glock_put(ip->i_gl);
201fail:
202 iget_failed(inode);
203 return ERR_PTR(error);
204}
205
206struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
207 u64 *no_formal_ino, unsigned int blktype)
208{
209 struct super_block *sb = sdp->sd_vfs;
210 struct gfs2_holder i_gh;
211 struct inode *inode = NULL;
212 int error;
213
214
215 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
216 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
217 if (error)
218 return ERR_PTR(error);
219
220 error = gfs2_check_blk_type(sdp, no_addr, blktype);
221 if (error)
222 goto fail;
223
224 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
225 if (IS_ERR(inode))
226 goto fail;
227
228
229 if (no_formal_ino) {
230 error = -ESTALE;
231 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
232 goto fail_iput;
233
234 error = -EIO;
235 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
236 goto fail_iput;
237
238 error = 0;
239 }
240
241fail:
242 gfs2_glock_dq_uninit(&i_gh);
243 return error ? ERR_PTR(error) : inode;
244fail_iput:
245 iput(inode);
246 goto fail;
247}
248
249
250struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
251{
252 struct qstr qstr;
253 struct inode *inode;
254 gfs2_str2qstr(&qstr, name);
255 inode = gfs2_lookupi(dip, &qstr, 1);
256
257
258
259
260
261 if (inode == NULL)
262 return ERR_PTR(-ENOENT);
263 else
264 return inode;
265}
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282
283struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
284 int is_root)
285{
286 struct super_block *sb = dir->i_sb;
287 struct gfs2_inode *dip = GFS2_I(dir);
288 struct gfs2_holder d_gh;
289 int error = 0;
290 struct inode *inode = NULL;
291 int unlock = 0;
292
293 if (!name->len || name->len > GFS2_FNAMESIZE)
294 return ERR_PTR(-ENAMETOOLONG);
295
296 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
297 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
298 dir == d_inode(sb->s_root))) {
299 igrab(dir);
300 return dir;
301 }
302
303 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
304 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
305 if (error)
306 return ERR_PTR(error);
307 unlock = 1;
308 }
309
310 if (!is_root) {
311 error = gfs2_permission(dir, MAY_EXEC);
312 if (error)
313 goto out;
314 }
315
316 inode = gfs2_dir_search(dir, name, false);
317 if (IS_ERR(inode))
318 error = PTR_ERR(inode);
319out:
320 if (unlock)
321 gfs2_glock_dq_uninit(&d_gh);
322 if (error == -ENOENT)
323 return NULL;
324 return inode ? inode : ERR_PTR(error);
325}
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335
336static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
337 umode_t mode)
338{
339 int error;
340
341 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
342 if (error)
343 return error;
344
345
346 if (!dip->i_inode.i_nlink)
347 return -ENOENT;
348
349 if (dip->i_entries == (u32)-1)
350 return -EFBIG;
351 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
352 return -EMLINK;
353
354 return 0;
355}
356
357static void munge_mode_uid_gid(const struct gfs2_inode *dip,
358 struct inode *inode)
359{
360 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
361 (dip->i_inode.i_mode & S_ISUID) &&
362 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
363 if (S_ISDIR(inode->i_mode))
364 inode->i_mode |= S_ISUID;
365 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
366 inode->i_mode &= ~07111;
367 inode->i_uid = dip->i_inode.i_uid;
368 } else
369 inode->i_uid = current_fsuid();
370
371 if (dip->i_inode.i_mode & S_ISGID) {
372 if (S_ISDIR(inode->i_mode))
373 inode->i_mode |= S_ISGID;
374 inode->i_gid = dip->i_inode.i_gid;
375 } else
376 inode->i_gid = current_fsgid();
377}
378
379static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
380{
381 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
382 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
383 int error;
384
385 error = gfs2_quota_lock_check(ip, &ap);
386 if (error)
387 goto out;
388
389 error = gfs2_inplace_reserve(ip, &ap);
390 if (error)
391 goto out_quota;
392
393 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
394 if (error)
395 goto out_ipreserv;
396
397 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
398 ip->i_no_formal_ino = ip->i_generation;
399 ip->i_inode.i_ino = ip->i_no_addr;
400 ip->i_goal = ip->i_no_addr;
401
402 gfs2_trans_end(sdp);
403
404out_ipreserv:
405 gfs2_inplace_release(ip);
406out_quota:
407 gfs2_quota_unlock(ip);
408out:
409 return error;
410}
411
412static void gfs2_init_dir(struct buffer_head *dibh,
413 const struct gfs2_inode *parent)
414{
415 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
416 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
417
418 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
419 dent->de_inum = di->di_num;
420 dent->de_type = cpu_to_be16(DT_DIR);
421
422 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
423 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
424 gfs2_inum_out(parent, dent);
425 dent->de_type = cpu_to_be16(DT_DIR);
426
427}
428
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432
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435
436
437static void gfs2_init_xattr(struct gfs2_inode *ip)
438{
439 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
440 struct buffer_head *bh;
441 struct gfs2_ea_header *ea;
442
443 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
444 gfs2_trans_add_meta(ip->i_gl, bh);
445 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
446 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
447
448 ea = GFS2_EA_BH2FIRST(bh);
449 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
450 ea->ea_type = GFS2_EATYPE_UNUSED;
451 ea->ea_flags = GFS2_EAFLAG_LAST;
452
453 brelse(bh);
454}
455
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461
462
463
464
465static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
466 const char *symname)
467{
468 struct gfs2_dinode *di;
469 struct buffer_head *dibh;
470
471 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
472 gfs2_trans_add_meta(ip->i_gl, dibh);
473 di = (struct gfs2_dinode *)dibh->b_data;
474 gfs2_dinode_out(ip, di);
475
476 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
477 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
478 di->__pad1 = 0;
479 di->__pad2 = 0;
480 di->__pad3 = 0;
481 memset(&di->__pad4, 0, sizeof(di->__pad4));
482 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
483 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
484
485 switch(ip->i_inode.i_mode & S_IFMT) {
486 case S_IFDIR:
487 gfs2_init_dir(dibh, dip);
488 break;
489 case S_IFLNK:
490 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
491 break;
492 }
493
494 set_buffer_uptodate(dibh);
495 brelse(dibh);
496}
497
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509
510
511
512static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
513 const struct gfs2_diradd *da,
514 unsigned nr_inodes)
515{
516 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
517 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
518}
519
520static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
521 struct gfs2_inode *ip, struct gfs2_diradd *da)
522{
523 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
524 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
525 int error;
526
527 if (da->nr_blocks) {
528 error = gfs2_quota_lock_check(dip, &ap);
529 if (error)
530 goto fail_quota_locks;
531
532 error = gfs2_inplace_reserve(dip, &ap);
533 if (error)
534 goto fail_quota_locks;
535
536 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
537 if (error)
538 goto fail_ipreserv;
539 } else {
540 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
541 if (error)
542 goto fail_quota_locks;
543 }
544
545 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
546
547 gfs2_trans_end(sdp);
548fail_ipreserv:
549 gfs2_inplace_release(dip);
550fail_quota_locks:
551 gfs2_quota_unlock(dip);
552 return error;
553}
554
555static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
556 void *fs_info)
557{
558 const struct xattr *xattr;
559 int err = 0;
560
561 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
562 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
563 xattr->value_len, 0,
564 GFS2_EATYPE_SECURITY);
565 if (err < 0)
566 break;
567 }
568 return err;
569}
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
585 struct file *file,
586 umode_t mode, dev_t dev, const char *symname,
587 unsigned int size, int excl, int *opened)
588{
589 const struct qstr *name = &dentry->d_name;
590 struct posix_acl *default_acl, *acl;
591 struct gfs2_holder ghs[2];
592 struct inode *inode = NULL;
593 struct gfs2_inode *dip = GFS2_I(dir), *ip;
594 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
595 struct gfs2_glock *io_gl;
596 int error, free_vfs_inode = 0;
597 u32 aflags = 0;
598 unsigned blocks = 1;
599 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
600
601 if (!name->len || name->len > GFS2_FNAMESIZE)
602 return -ENAMETOOLONG;
603
604 error = gfs2_rs_alloc(dip);
605 if (error)
606 return error;
607
608 error = gfs2_rindex_update(sdp);
609 if (error)
610 return error;
611
612 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
613 if (error)
614 goto fail;
615
616 error = create_ok(dip, name, mode);
617 if (error)
618 goto fail_gunlock;
619
620 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
621 error = PTR_ERR(inode);
622 if (!IS_ERR(inode)) {
623 if (S_ISDIR(inode->i_mode)) {
624 iput(inode);
625 inode = ERR_PTR(-EISDIR);
626 goto fail_gunlock;
627 }
628 d_instantiate(dentry, inode);
629 error = 0;
630 if (file) {
631 if (S_ISREG(inode->i_mode))
632 error = finish_open(file, dentry, gfs2_open_common, opened);
633 else
634 error = finish_no_open(file, NULL);
635 }
636 gfs2_glock_dq_uninit(ghs);
637 return error;
638 } else if (error != -ENOENT) {
639 goto fail_gunlock;
640 }
641
642 error = gfs2_diradd_alloc_required(dir, name, &da);
643 if (error < 0)
644 goto fail_gunlock;
645
646 inode = new_inode(sdp->sd_vfs);
647 error = -ENOMEM;
648 if (!inode)
649 goto fail_gunlock;
650
651 error = posix_acl_create(dir, &mode, &default_acl, &acl);
652 if (error)
653 goto fail_free_vfs_inode;
654
655 ip = GFS2_I(inode);
656 error = gfs2_rs_alloc(ip);
657 if (error)
658 goto fail_free_acls;
659
660 inode->i_mode = mode;
661 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
662 inode->i_rdev = dev;
663 inode->i_size = size;
664 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
665 gfs2_set_inode_blocks(inode, 1);
666 munge_mode_uid_gid(dip, inode);
667 check_and_update_goal(dip);
668 ip->i_goal = dip->i_goal;
669 ip->i_diskflags = 0;
670 ip->i_eattr = 0;
671 ip->i_height = 0;
672 ip->i_depth = 0;
673 ip->i_entries = 0;
674
675 switch(mode & S_IFMT) {
676 case S_IFREG:
677 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
678 gfs2_tune_get(sdp, gt_new_files_jdata))
679 ip->i_diskflags |= GFS2_DIF_JDATA;
680 gfs2_set_aops(inode);
681 break;
682 case S_IFDIR:
683 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
684 ip->i_diskflags |= GFS2_DIF_JDATA;
685 ip->i_entries = 2;
686 break;
687 }
688 gfs2_set_inode_flags(inode);
689
690 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
691 (dip->i_diskflags & GFS2_DIF_TOPDIR))
692 aflags |= GFS2_AF_ORLOV;
693
694 if (default_acl || acl)
695 blocks++;
696
697 error = alloc_dinode(ip, aflags, &blocks);
698 if (error)
699 goto fail_free_inode;
700
701 gfs2_set_inode_blocks(inode, blocks);
702
703 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
704 if (error)
705 goto fail_free_inode;
706
707 ip->i_gl->gl_object = ip;
708 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
709 if (error)
710 goto fail_free_inode;
711
712 error = gfs2_trans_begin(sdp, blocks, 0);
713 if (error)
714 goto fail_gunlock2;
715
716 if (blocks > 1) {
717 ip->i_eattr = ip->i_no_addr + 1;
718 gfs2_init_xattr(ip);
719 }
720 init_dinode(dip, ip, symname);
721 gfs2_trans_end(sdp);
722
723 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
724 if (error)
725 goto fail_gunlock2;
726
727 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
728 if (error)
729 goto fail_gunlock2;
730
731 ip->i_iopen_gh.gh_gl->gl_object = ip;
732 gfs2_glock_put(io_gl);
733 gfs2_set_iop(inode);
734 insert_inode_hash(inode);
735
736 if (default_acl) {
737 error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
738 posix_acl_release(default_acl);
739 }
740 if (acl) {
741 if (!error)
742 error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
743 posix_acl_release(acl);
744 }
745
746 if (error)
747 goto fail_gunlock3;
748
749 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
750 &gfs2_initxattrs, NULL);
751 if (error)
752 goto fail_gunlock3;
753
754 error = link_dinode(dip, name, ip, &da);
755 if (error)
756 goto fail_gunlock3;
757
758 mark_inode_dirty(inode);
759 d_instantiate(dentry, inode);
760 if (file) {
761 *opened |= FILE_CREATED;
762 error = finish_open(file, dentry, gfs2_open_common, opened);
763 }
764 gfs2_glock_dq_uninit(ghs);
765 gfs2_glock_dq_uninit(ghs + 1);
766 return error;
767
768fail_gunlock3:
769 gfs2_glock_dq_uninit(ghs + 1);
770 if (ip->i_gl)
771 gfs2_glock_put(ip->i_gl);
772 goto fail_gunlock;
773
774fail_gunlock2:
775 gfs2_glock_dq_uninit(ghs + 1);
776fail_free_inode:
777 if (ip->i_gl)
778 gfs2_glock_put(ip->i_gl);
779 gfs2_rs_delete(ip, NULL);
780fail_free_acls:
781 if (default_acl)
782 posix_acl_release(default_acl);
783 if (acl)
784 posix_acl_release(acl);
785fail_free_vfs_inode:
786 free_vfs_inode = 1;
787fail_gunlock:
788 gfs2_dir_no_add(&da);
789 gfs2_glock_dq_uninit(ghs);
790 if (inode && !IS_ERR(inode)) {
791 clear_nlink(inode);
792 if (!free_vfs_inode)
793 mark_inode_dirty(inode);
794 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
795 &GFS2_I(inode)->i_flags);
796 iput(inode);
797 }
798fail:
799 return error;
800}
801
802
803
804
805
806
807
808
809
810
811static int gfs2_create(struct inode *dir, struct dentry *dentry,
812 umode_t mode, bool excl)
813{
814 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
815}
816
817
818
819
820
821
822
823
824
825
826
827
828static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
829 struct file *file, int *opened)
830{
831 struct inode *inode;
832 struct dentry *d;
833 struct gfs2_holder gh;
834 struct gfs2_glock *gl;
835 int error;
836
837 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
838 if (inode == NULL) {
839 d_add(dentry, NULL);
840 return NULL;
841 }
842 if (IS_ERR(inode))
843 return ERR_CAST(inode);
844
845 gl = GFS2_I(inode)->i_gl;
846 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
847 if (error) {
848 iput(inode);
849 return ERR_PTR(error);
850 }
851
852 d = d_splice_alias(inode, dentry);
853 if (IS_ERR(d)) {
854 gfs2_glock_dq_uninit(&gh);
855 return d;
856 }
857 if (file && S_ISREG(inode->i_mode))
858 error = finish_open(file, dentry, gfs2_open_common, opened);
859
860 gfs2_glock_dq_uninit(&gh);
861 if (error) {
862 dput(d);
863 return ERR_PTR(error);
864 }
865 return d;
866}
867
868static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
869 unsigned flags)
870{
871 return __gfs2_lookup(dir, dentry, NULL, NULL);
872}
873
874
875
876
877
878
879
880
881
882
883
884
885
886static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
887 struct dentry *dentry)
888{
889 struct gfs2_inode *dip = GFS2_I(dir);
890 struct gfs2_sbd *sdp = GFS2_SB(dir);
891 struct inode *inode = d_inode(old_dentry);
892 struct gfs2_inode *ip = GFS2_I(inode);
893 struct gfs2_holder ghs[2];
894 struct buffer_head *dibh;
895 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
896 int error;
897
898 if (S_ISDIR(inode->i_mode))
899 return -EPERM;
900
901 error = gfs2_rs_alloc(dip);
902 if (error)
903 return error;
904
905 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
906 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
907
908 error = gfs2_glock_nq(ghs);
909 if (error)
910 goto out_parent;
911
912 error = gfs2_glock_nq(ghs + 1);
913 if (error)
914 goto out_child;
915
916 error = -ENOENT;
917 if (inode->i_nlink == 0)
918 goto out_gunlock;
919
920 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
921 if (error)
922 goto out_gunlock;
923
924 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
925 switch (error) {
926 case -ENOENT:
927 break;
928 case 0:
929 error = -EEXIST;
930 default:
931 goto out_gunlock;
932 }
933
934 error = -EINVAL;
935 if (!dip->i_inode.i_nlink)
936 goto out_gunlock;
937 error = -EFBIG;
938 if (dip->i_entries == (u32)-1)
939 goto out_gunlock;
940 error = -EPERM;
941 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
942 goto out_gunlock;
943 error = -EINVAL;
944 if (!ip->i_inode.i_nlink)
945 goto out_gunlock;
946 error = -EMLINK;
947 if (ip->i_inode.i_nlink == (u32)-1)
948 goto out_gunlock;
949
950 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
951 if (error < 0)
952 goto out_gunlock;
953
954 if (da.nr_blocks) {
955 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
956 error = gfs2_quota_lock_check(dip, &ap);
957 if (error)
958 goto out_gunlock;
959
960 error = gfs2_inplace_reserve(dip, &ap);
961 if (error)
962 goto out_gunlock_q;
963
964 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
965 if (error)
966 goto out_ipres;
967 } else {
968 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
969 if (error)
970 goto out_ipres;
971 }
972
973 error = gfs2_meta_inode_buffer(ip, &dibh);
974 if (error)
975 goto out_end_trans;
976
977 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
978 if (error)
979 goto out_brelse;
980
981 gfs2_trans_add_meta(ip->i_gl, dibh);
982 inc_nlink(&ip->i_inode);
983 ip->i_inode.i_ctime = CURRENT_TIME;
984 ihold(inode);
985 d_instantiate(dentry, inode);
986 mark_inode_dirty(inode);
987
988out_brelse:
989 brelse(dibh);
990out_end_trans:
991 gfs2_trans_end(sdp);
992out_ipres:
993 if (da.nr_blocks)
994 gfs2_inplace_release(dip);
995out_gunlock_q:
996 if (da.nr_blocks)
997 gfs2_quota_unlock(dip);
998out_gunlock:
999 gfs2_dir_no_add(&da);
1000 gfs2_glock_dq(ghs + 1);
1001out_child:
1002 gfs2_glock_dq(ghs);
1003out_parent:
1004 gfs2_holder_uninit(ghs);
1005 gfs2_holder_uninit(ghs + 1);
1006 return error;
1007}
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1021 const struct gfs2_inode *ip)
1022{
1023 int error;
1024
1025 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1026 return -EPERM;
1027
1028 if ((dip->i_inode.i_mode & S_ISVTX) &&
1029 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1030 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1031 return -EPERM;
1032
1033 if (IS_APPEND(&dip->i_inode))
1034 return -EPERM;
1035
1036 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1037 if (error)
1038 return error;
1039
1040 return gfs2_dir_check(&dip->i_inode, name, ip);
1041}
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055static int gfs2_unlink_inode(struct gfs2_inode *dip,
1056 const struct dentry *dentry)
1057{
1058 struct inode *inode = d_inode(dentry);
1059 struct gfs2_inode *ip = GFS2_I(inode);
1060 int error;
1061
1062 error = gfs2_dir_del(dip, dentry);
1063 if (error)
1064 return error;
1065
1066 ip->i_entries = 0;
1067 inode->i_ctime = CURRENT_TIME;
1068 if (S_ISDIR(inode->i_mode))
1069 clear_nlink(inode);
1070 else
1071 drop_nlink(inode);
1072 mark_inode_dirty(inode);
1073 if (inode->i_nlink == 0)
1074 gfs2_unlink_di(inode);
1075 return 0;
1076}
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1091{
1092 struct gfs2_inode *dip = GFS2_I(dir);
1093 struct gfs2_sbd *sdp = GFS2_SB(dir);
1094 struct inode *inode = d_inode(dentry);
1095 struct gfs2_inode *ip = GFS2_I(inode);
1096 struct gfs2_holder ghs[3];
1097 struct gfs2_rgrpd *rgd;
1098 int error;
1099
1100 error = gfs2_rindex_update(sdp);
1101 if (error)
1102 return error;
1103
1104 error = -EROFS;
1105
1106 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1107 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1108
1109 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1110 if (!rgd)
1111 goto out_inodes;
1112
1113 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1114
1115
1116 error = gfs2_glock_nq(ghs);
1117 if (error)
1118 goto out_parent;
1119
1120 error = gfs2_glock_nq(ghs + 1);
1121 if (error)
1122 goto out_child;
1123
1124 error = -ENOENT;
1125 if (inode->i_nlink == 0)
1126 goto out_rgrp;
1127
1128 if (S_ISDIR(inode->i_mode)) {
1129 error = -ENOTEMPTY;
1130 if (ip->i_entries > 2 || inode->i_nlink > 2)
1131 goto out_rgrp;
1132 }
1133
1134 error = gfs2_glock_nq(ghs + 2);
1135 if (error)
1136 goto out_rgrp;
1137
1138 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1139 if (error)
1140 goto out_gunlock;
1141
1142 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1143 if (error)
1144 goto out_end_trans;
1145
1146 error = gfs2_unlink_inode(dip, dentry);
1147
1148out_end_trans:
1149 gfs2_trans_end(sdp);
1150out_gunlock:
1151 gfs2_glock_dq(ghs + 2);
1152out_rgrp:
1153 gfs2_glock_dq(ghs + 1);
1154out_child:
1155 gfs2_glock_dq(ghs);
1156out_parent:
1157 gfs2_holder_uninit(ghs + 2);
1158out_inodes:
1159 gfs2_holder_uninit(ghs + 1);
1160 gfs2_holder_uninit(ghs);
1161 return error;
1162}
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1174 const char *symname)
1175{
1176 struct gfs2_sbd *sdp = GFS2_SB(dir);
1177 unsigned int size;
1178
1179 size = strlen(symname);
1180 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1181 return -ENAMETOOLONG;
1182
1183 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1184}
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1196{
1197 struct gfs2_sbd *sdp = GFS2_SB(dir);
1198 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1199 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1200}
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1212 dev_t dev)
1213{
1214 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1215}
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1230 struct file *file, unsigned flags,
1231 umode_t mode, int *opened)
1232{
1233 struct dentry *d;
1234 bool excl = !!(flags & O_EXCL);
1235
1236 if (!d_unhashed(dentry))
1237 goto skip_lookup;
1238
1239 d = __gfs2_lookup(dir, dentry, file, opened);
1240 if (IS_ERR(d))
1241 return PTR_ERR(d);
1242 if (d != NULL)
1243 dentry = d;
1244 if (d_really_is_positive(dentry)) {
1245 if (!(*opened & FILE_OPENED))
1246 return finish_no_open(file, d);
1247 dput(d);
1248 return 0;
1249 }
1250
1251 BUG_ON(d != NULL);
1252
1253skip_lookup:
1254 if (!(flags & O_CREAT))
1255 return -ENOENT;
1256
1257 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1258}
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1272{
1273 struct inode *dir = &to->i_inode;
1274 struct super_block *sb = dir->i_sb;
1275 struct inode *tmp;
1276 int error = 0;
1277
1278 igrab(dir);
1279
1280 for (;;) {
1281 if (dir == &this->i_inode) {
1282 error = -EINVAL;
1283 break;
1284 }
1285 if (dir == d_inode(sb->s_root)) {
1286 error = 0;
1287 break;
1288 }
1289
1290 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1291 if (!tmp) {
1292 error = -ENOENT;
1293 break;
1294 }
1295 if (IS_ERR(tmp)) {
1296 error = PTR_ERR(tmp);
1297 break;
1298 }
1299
1300 iput(dir);
1301 dir = tmp;
1302 }
1303
1304 iput(dir);
1305
1306 return error;
1307}
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1319 int dir_rename)
1320{
1321 int error;
1322 struct buffer_head *dibh;
1323
1324 if (dir_rename)
1325 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1326
1327 error = gfs2_meta_inode_buffer(ip, &dibh);
1328 if (error)
1329 return error;
1330 ip->i_inode.i_ctime = CURRENT_TIME;
1331 gfs2_trans_add_meta(ip->i_gl, dibh);
1332 gfs2_dinode_out(ip, dibh->b_data);
1333 brelse(dibh);
1334 return 0;
1335}
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1349 struct inode *ndir, struct dentry *ndentry)
1350{
1351 struct gfs2_inode *odip = GFS2_I(odir);
1352 struct gfs2_inode *ndip = GFS2_I(ndir);
1353 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1354 struct gfs2_inode *nip = NULL;
1355 struct gfs2_sbd *sdp = GFS2_SB(odir);
1356 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1357 struct gfs2_rgrpd *nrgd;
1358 unsigned int num_gh;
1359 int dir_rename = 0;
1360 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1361 unsigned int x;
1362 int error;
1363
1364 if (d_really_is_positive(ndentry)) {
1365 nip = GFS2_I(d_inode(ndentry));
1366 if (ip == nip)
1367 return 0;
1368 }
1369
1370 error = gfs2_rindex_update(sdp);
1371 if (error)
1372 return error;
1373
1374 error = gfs2_rs_alloc(ndip);
1375 if (error)
1376 return error;
1377
1378 if (odip != ndip) {
1379 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1380 0, &r_gh);
1381 if (error)
1382 goto out;
1383
1384 if (S_ISDIR(ip->i_inode.i_mode)) {
1385 dir_rename = 1;
1386
1387 error = gfs2_ok_to_move(ip, ndip);
1388 if (error)
1389 goto out_gunlock_r;
1390 }
1391 }
1392
1393 num_gh = 1;
1394 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1395 if (odip != ndip) {
1396 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1397 num_gh++;
1398 }
1399 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1400 num_gh++;
1401
1402 if (nip) {
1403 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1404 num_gh++;
1405
1406
1407
1408
1409 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1410 if (nrgd)
1411 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1412 }
1413
1414 for (x = 0; x < num_gh; x++) {
1415 error = gfs2_glock_nq(ghs + x);
1416 if (error)
1417 goto out_gunlock;
1418 }
1419
1420 error = -ENOENT;
1421 if (ip->i_inode.i_nlink == 0)
1422 goto out_gunlock;
1423
1424
1425
1426 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1427 if (error)
1428 goto out_gunlock;
1429
1430
1431
1432 if (nip) {
1433 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1434 if (error)
1435 goto out_gunlock;
1436
1437 if (nip->i_inode.i_nlink == 0) {
1438 error = -EAGAIN;
1439 goto out_gunlock;
1440 }
1441
1442 if (S_ISDIR(nip->i_inode.i_mode)) {
1443 if (nip->i_entries < 2) {
1444 gfs2_consist_inode(nip);
1445 error = -EIO;
1446 goto out_gunlock;
1447 }
1448 if (nip->i_entries > 2) {
1449 error = -ENOTEMPTY;
1450 goto out_gunlock;
1451 }
1452 }
1453 } else {
1454 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1455 if (error)
1456 goto out_gunlock;
1457
1458 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1459 switch (error) {
1460 case -ENOENT:
1461 error = 0;
1462 break;
1463 case 0:
1464 error = -EEXIST;
1465 default:
1466 goto out_gunlock;
1467 };
1468
1469 if (odip != ndip) {
1470 if (!ndip->i_inode.i_nlink) {
1471 error = -ENOENT;
1472 goto out_gunlock;
1473 }
1474 if (ndip->i_entries == (u32)-1) {
1475 error = -EFBIG;
1476 goto out_gunlock;
1477 }
1478 if (S_ISDIR(ip->i_inode.i_mode) &&
1479 ndip->i_inode.i_nlink == (u32)-1) {
1480 error = -EMLINK;
1481 goto out_gunlock;
1482 }
1483 }
1484 }
1485
1486
1487
1488 if (dir_rename) {
1489 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1490 if (error)
1491 goto out_gunlock;
1492 }
1493
1494 if (nip == NULL) {
1495 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1496 if (error)
1497 goto out_gunlock;
1498 }
1499
1500 if (da.nr_blocks) {
1501 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1502 error = gfs2_quota_lock_check(ndip, &ap);
1503 if (error)
1504 goto out_gunlock;
1505
1506 error = gfs2_inplace_reserve(ndip, &ap);
1507 if (error)
1508 goto out_gunlock_q;
1509
1510 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1511 4 * RES_LEAF + 4, 0);
1512 if (error)
1513 goto out_ipreserv;
1514 } else {
1515 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1516 5 * RES_LEAF + 4, 0);
1517 if (error)
1518 goto out_gunlock;
1519 }
1520
1521
1522
1523 if (nip)
1524 error = gfs2_unlink_inode(ndip, ndentry);
1525
1526 error = update_moved_ino(ip, ndip, dir_rename);
1527 if (error)
1528 goto out_end_trans;
1529
1530 error = gfs2_dir_del(odip, odentry);
1531 if (error)
1532 goto out_end_trans;
1533
1534 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1535 if (error)
1536 goto out_end_trans;
1537
1538out_end_trans:
1539 gfs2_trans_end(sdp);
1540out_ipreserv:
1541 if (da.nr_blocks)
1542 gfs2_inplace_release(ndip);
1543out_gunlock_q:
1544 if (da.nr_blocks)
1545 gfs2_quota_unlock(ndip);
1546out_gunlock:
1547 gfs2_dir_no_add(&da);
1548 while (x--) {
1549 gfs2_glock_dq(ghs + x);
1550 gfs2_holder_uninit(ghs + x);
1551 }
1552out_gunlock_r:
1553 if (r_gh.gh_gl)
1554 gfs2_glock_dq_uninit(&r_gh);
1555out:
1556 return error;
1557}
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1571 struct inode *ndir, struct dentry *ndentry,
1572 unsigned int flags)
1573{
1574 struct gfs2_inode *odip = GFS2_I(odir);
1575 struct gfs2_inode *ndip = GFS2_I(ndir);
1576 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1577 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1578 struct gfs2_sbd *sdp = GFS2_SB(odir);
1579 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1580 unsigned int num_gh;
1581 unsigned int x;
1582 umode_t old_mode = oip->i_inode.i_mode;
1583 umode_t new_mode = nip->i_inode.i_mode;
1584 int error;
1585
1586 error = gfs2_rindex_update(sdp);
1587 if (error)
1588 return error;
1589
1590 if (odip != ndip) {
1591 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1592 0, &r_gh);
1593 if (error)
1594 goto out;
1595
1596 if (S_ISDIR(old_mode)) {
1597
1598 error = gfs2_ok_to_move(oip, ndip);
1599 if (error)
1600 goto out_gunlock_r;
1601 }
1602
1603 if (S_ISDIR(new_mode)) {
1604
1605 error = gfs2_ok_to_move(nip, odip);
1606 if (error)
1607 goto out_gunlock_r;
1608 }
1609 }
1610
1611 num_gh = 1;
1612 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1613 if (odip != ndip) {
1614 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1615 num_gh++;
1616 }
1617 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1618 num_gh++;
1619
1620 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1621 num_gh++;
1622
1623 for (x = 0; x < num_gh; x++) {
1624 error = gfs2_glock_nq(ghs + x);
1625 if (error)
1626 goto out_gunlock;
1627 }
1628
1629 error = -ENOENT;
1630 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1631 goto out_gunlock;
1632
1633 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1634 if (error)
1635 goto out_gunlock;
1636 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1637 if (error)
1638 goto out_gunlock;
1639
1640 if (S_ISDIR(old_mode)) {
1641 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1642 if (error)
1643 goto out_gunlock;
1644 }
1645 if (S_ISDIR(new_mode)) {
1646 error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1647 if (error)
1648 goto out_gunlock;
1649 }
1650 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1651 if (error)
1652 goto out_gunlock;
1653
1654 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1655 if (error)
1656 goto out_end_trans;
1657
1658 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1659 if (error)
1660 goto out_end_trans;
1661
1662 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1663 IF2DT(old_mode));
1664 if (error)
1665 goto out_end_trans;
1666
1667 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1668 IF2DT(new_mode));
1669 if (error)
1670 goto out_end_trans;
1671
1672 if (odip != ndip) {
1673 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1674 inc_nlink(&odip->i_inode);
1675 drop_nlink(&ndip->i_inode);
1676 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1677 inc_nlink(&ndip->i_inode);
1678 drop_nlink(&odip->i_inode);
1679 }
1680 }
1681 mark_inode_dirty(&ndip->i_inode);
1682 if (odip != ndip)
1683 mark_inode_dirty(&odip->i_inode);
1684
1685out_end_trans:
1686 gfs2_trans_end(sdp);
1687out_gunlock:
1688 while (x--) {
1689 gfs2_glock_dq(ghs + x);
1690 gfs2_holder_uninit(ghs + x);
1691 }
1692out_gunlock_r:
1693 if (r_gh.gh_gl)
1694 gfs2_glock_dq_uninit(&r_gh);
1695out:
1696 return error;
1697}
1698
1699static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1700 struct inode *ndir, struct dentry *ndentry,
1701 unsigned int flags)
1702{
1703 flags &= ~RENAME_NOREPLACE;
1704
1705 if (flags & ~RENAME_EXCHANGE)
1706 return -EINVAL;
1707
1708 if (flags & RENAME_EXCHANGE)
1709 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1710
1711 return gfs2_rename(odir, odentry, ndir, ndentry);
1712}
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724static const char *gfs2_follow_link(struct dentry *dentry, void **cookie)
1725{
1726 struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
1727 struct gfs2_holder i_gh;
1728 struct buffer_head *dibh;
1729 unsigned int size;
1730 char *buf;
1731 int error;
1732
1733 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1734 error = gfs2_glock_nq(&i_gh);
1735 if (error) {
1736 gfs2_holder_uninit(&i_gh);
1737 return ERR_PTR(error);
1738 }
1739
1740 size = (unsigned int)i_size_read(&ip->i_inode);
1741 if (size == 0) {
1742 gfs2_consist_inode(ip);
1743 buf = ERR_PTR(-EIO);
1744 goto out;
1745 }
1746
1747 error = gfs2_meta_inode_buffer(ip, &dibh);
1748 if (error) {
1749 buf = ERR_PTR(error);
1750 goto out;
1751 }
1752
1753 buf = kzalloc(size + 1, GFP_NOFS);
1754 if (!buf)
1755 buf = ERR_PTR(-ENOMEM);
1756 else
1757 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1758 brelse(dibh);
1759out:
1760 gfs2_glock_dq_uninit(&i_gh);
1761 if (!IS_ERR(buf))
1762 *cookie = buf;
1763 return buf;
1764}
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779int gfs2_permission(struct inode *inode, int mask)
1780{
1781 struct gfs2_inode *ip;
1782 struct gfs2_holder i_gh;
1783 int error;
1784 int unlock = 0;
1785
1786
1787 ip = GFS2_I(inode);
1788 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1789 if (mask & MAY_NOT_BLOCK)
1790 return -ECHILD;
1791 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1792 if (error)
1793 return error;
1794 unlock = 1;
1795 }
1796
1797 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1798 error = -EACCES;
1799 else
1800 error = generic_permission(inode, mask);
1801 if (unlock)
1802 gfs2_glock_dq_uninit(&i_gh);
1803
1804 return error;
1805}
1806
1807static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1808{
1809 setattr_copy(inode, attr);
1810 mark_inode_dirty(inode);
1811 return 0;
1812}
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1823{
1824 int error;
1825
1826 if (current->journal_info)
1827 return __gfs2_setattr_simple(inode, attr);
1828
1829 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1830 if (error)
1831 return error;
1832
1833 error = __gfs2_setattr_simple(inode, attr);
1834 gfs2_trans_end(GFS2_SB(inode));
1835 return error;
1836}
1837
1838static int setattr_chown(struct inode *inode, struct iattr *attr)
1839{
1840 struct gfs2_inode *ip = GFS2_I(inode);
1841 struct gfs2_sbd *sdp = GFS2_SB(inode);
1842 kuid_t ouid, nuid;
1843 kgid_t ogid, ngid;
1844 int error;
1845 struct gfs2_alloc_parms ap;
1846
1847 ouid = inode->i_uid;
1848 ogid = inode->i_gid;
1849 nuid = attr->ia_uid;
1850 ngid = attr->ia_gid;
1851
1852 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1853 ouid = nuid = NO_UID_QUOTA_CHANGE;
1854 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1855 ogid = ngid = NO_GID_QUOTA_CHANGE;
1856
1857 error = get_write_access(inode);
1858 if (error)
1859 return error;
1860
1861 error = gfs2_rs_alloc(ip);
1862 if (error)
1863 goto out;
1864
1865 error = gfs2_rindex_update(sdp);
1866 if (error)
1867 goto out;
1868
1869 error = gfs2_quota_lock(ip, nuid, ngid);
1870 if (error)
1871 goto out;
1872
1873 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1874
1875 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1876 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1877 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1878 if (error)
1879 goto out_gunlock_q;
1880 }
1881
1882 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1883 if (error)
1884 goto out_gunlock_q;
1885
1886 error = gfs2_setattr_simple(inode, attr);
1887 if (error)
1888 goto out_end_trans;
1889
1890 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1891 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1892 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1893 gfs2_quota_change(ip, ap.target, nuid, ngid);
1894 }
1895
1896out_end_trans:
1897 gfs2_trans_end(sdp);
1898out_gunlock_q:
1899 gfs2_quota_unlock(ip);
1900out:
1901 put_write_access(inode);
1902 return error;
1903}
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1917{
1918 struct inode *inode = d_inode(dentry);
1919 struct gfs2_inode *ip = GFS2_I(inode);
1920 struct gfs2_holder i_gh;
1921 int error;
1922
1923 error = gfs2_rs_alloc(ip);
1924 if (error)
1925 return error;
1926
1927 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1928 if (error)
1929 return error;
1930
1931 error = -EPERM;
1932 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1933 goto out;
1934
1935 error = inode_change_ok(inode, attr);
1936 if (error)
1937 goto out;
1938
1939 if (attr->ia_valid & ATTR_SIZE)
1940 error = gfs2_setattr_size(inode, attr->ia_size);
1941 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1942 error = setattr_chown(inode, attr);
1943 else {
1944 error = gfs2_setattr_simple(inode, attr);
1945 if (!error && attr->ia_valid & ATTR_MODE)
1946 error = posix_acl_chmod(inode, inode->i_mode);
1947 }
1948
1949out:
1950 if (!error)
1951 mark_inode_dirty(inode);
1952 gfs2_glock_dq_uninit(&i_gh);
1953 return error;
1954}
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1972 struct kstat *stat)
1973{
1974 struct inode *inode = d_inode(dentry);
1975 struct gfs2_inode *ip = GFS2_I(inode);
1976 struct gfs2_holder gh;
1977 int error;
1978 int unlock = 0;
1979
1980 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1981 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1982 if (error)
1983 return error;
1984 unlock = 1;
1985 }
1986
1987 generic_fillattr(inode, stat);
1988 if (unlock)
1989 gfs2_glock_dq_uninit(&gh);
1990
1991 return 0;
1992}
1993
1994static int gfs2_setxattr(struct dentry *dentry, const char *name,
1995 const void *data, size_t size, int flags)
1996{
1997 struct inode *inode = d_inode(dentry);
1998 struct gfs2_inode *ip = GFS2_I(inode);
1999 struct gfs2_holder gh;
2000 int ret;
2001
2002 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
2003 ret = gfs2_glock_nq(&gh);
2004 if (ret == 0) {
2005 ret = gfs2_rs_alloc(ip);
2006 if (ret == 0)
2007 ret = generic_setxattr(dentry, name, data, size, flags);
2008 gfs2_glock_dq(&gh);
2009 }
2010 gfs2_holder_uninit(&gh);
2011 return ret;
2012}
2013
2014static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
2015 void *data, size_t size)
2016{
2017 struct inode *inode = d_inode(dentry);
2018 struct gfs2_inode *ip = GFS2_I(inode);
2019 struct gfs2_holder gh;
2020 int ret;
2021
2022
2023 if (gfs2_glock_is_locked_by_me(ip->i_gl))
2024 return generic_getxattr(dentry, name, data, size);
2025
2026 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2027 ret = gfs2_glock_nq(&gh);
2028 if (ret == 0) {
2029 ret = generic_getxattr(dentry, name, data, size);
2030 gfs2_glock_dq(&gh);
2031 }
2032 gfs2_holder_uninit(&gh);
2033 return ret;
2034}
2035
2036static int gfs2_removexattr(struct dentry *dentry, const char *name)
2037{
2038 struct inode *inode = d_inode(dentry);
2039 struct gfs2_inode *ip = GFS2_I(inode);
2040 struct gfs2_holder gh;
2041 int ret;
2042
2043 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
2044 ret = gfs2_glock_nq(&gh);
2045 if (ret == 0) {
2046 ret = gfs2_rs_alloc(ip);
2047 if (ret == 0)
2048 ret = generic_removexattr(dentry, name);
2049 gfs2_glock_dq(&gh);
2050 }
2051 gfs2_holder_uninit(&gh);
2052 return ret;
2053}
2054
2055static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2056 u64 start, u64 len)
2057{
2058 struct gfs2_inode *ip = GFS2_I(inode);
2059 struct gfs2_holder gh;
2060 int ret;
2061
2062 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
2063 if (ret)
2064 return ret;
2065
2066 mutex_lock(&inode->i_mutex);
2067
2068 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2069 if (ret)
2070 goto out;
2071
2072 if (gfs2_is_stuffed(ip)) {
2073 u64 phys = ip->i_no_addr << inode->i_blkbits;
2074 u64 size = i_size_read(inode);
2075 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
2076 FIEMAP_EXTENT_DATA_INLINE;
2077 phys += sizeof(struct gfs2_dinode);
2078 phys += start;
2079 if (start + len > size)
2080 len = size - start;
2081 if (start < size)
2082 ret = fiemap_fill_next_extent(fieinfo, start, phys,
2083 len, flags);
2084 if (ret == 1)
2085 ret = 0;
2086 } else {
2087 ret = __generic_block_fiemap(inode, fieinfo, start, len,
2088 gfs2_block_map);
2089 }
2090
2091 gfs2_glock_dq_uninit(&gh);
2092out:
2093 mutex_unlock(&inode->i_mutex);
2094 return ret;
2095}
2096
2097const struct inode_operations gfs2_file_iops = {
2098 .permission = gfs2_permission,
2099 .setattr = gfs2_setattr,
2100 .getattr = gfs2_getattr,
2101 .setxattr = gfs2_setxattr,
2102 .getxattr = gfs2_getxattr,
2103 .listxattr = gfs2_listxattr,
2104 .removexattr = gfs2_removexattr,
2105 .fiemap = gfs2_fiemap,
2106 .get_acl = gfs2_get_acl,
2107 .set_acl = gfs2_set_acl,
2108};
2109
2110const struct inode_operations gfs2_dir_iops = {
2111 .create = gfs2_create,
2112 .lookup = gfs2_lookup,
2113 .link = gfs2_link,
2114 .unlink = gfs2_unlink,
2115 .symlink = gfs2_symlink,
2116 .mkdir = gfs2_mkdir,
2117 .rmdir = gfs2_unlink,
2118 .mknod = gfs2_mknod,
2119 .rename2 = gfs2_rename2,
2120 .permission = gfs2_permission,
2121 .setattr = gfs2_setattr,
2122 .getattr = gfs2_getattr,
2123 .setxattr = gfs2_setxattr,
2124 .getxattr = gfs2_getxattr,
2125 .listxattr = gfs2_listxattr,
2126 .removexattr = gfs2_removexattr,
2127 .fiemap = gfs2_fiemap,
2128 .get_acl = gfs2_get_acl,
2129 .set_acl = gfs2_set_acl,
2130 .atomic_open = gfs2_atomic_open,
2131};
2132
2133const struct inode_operations gfs2_symlink_iops = {
2134 .readlink = generic_readlink,
2135 .follow_link = gfs2_follow_link,
2136 .put_link = kfree_put_link,
2137 .permission = gfs2_permission,
2138 .setattr = gfs2_setattr,
2139 .getattr = gfs2_getattr,
2140 .setxattr = gfs2_setxattr,
2141 .getxattr = gfs2_getxattr,
2142 .listxattr = gfs2_listxattr,
2143 .removexattr = gfs2_removexattr,
2144 .fiemap = gfs2_fiemap,
2145};
2146
2147