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authorSteven Whitehouse <swhiteho@redhat.com>2011-05-10 08:12:49 -0400
committerSteven Whitehouse <swhiteho@redhat.com>2011-05-10 08:12:49 -0400
commit2ab9cd1c63b519e37b21b504376822be983badba (patch)
tree6293f520ef56e77b5ad9de6d773b585643450ecf /fs/gfs2/ops_inode.c
parent64ea5402581485237d3b6e3a0cf2b364ad8bd580 (diff)
GFS2: Rename ops_inode.c to inode.c
This is the final part of the ops_inode.c/inode.c reordering. We are left with a single file called inode.c which now contains all the inode operations, as expected. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/ops_inode.c')
-rw-r--r--fs/gfs2/ops_inode.c1990
1 files changed, 0 insertions, 1990 deletions
diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
deleted file mode 100644
index a783a7a8c0ca..000000000000
--- a/fs/gfs2/ops_inode.c
+++ /dev/null
@@ -1,1990 +0,0 @@
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/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}
96
97/**
98 * gfs2_set_iop - Sets inode operations
99 * @inode: The inode with correct i_mode filled in
100 *
101 * GFS2 lookup code fills in vfs inode contents based on info obtained
102 * from directory entry inside gfs2_inode_lookup().
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}
129
130/**
131 * gfs2_inode_lookup - Lookup an inode
132 * @sb: The super block
133 * @no_addr: The inode number
134 * @type: The type of the inode
135 * non_block: Can we block on inodes that are being freed?
136 *
137 * Returns: A VFS inode, or an error
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(-ENOBUFS);
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 /* Inode glock must be locked already */
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_gl->gl_object = NULL;
193 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
194fail_iopen:
195 if (io_gl)
196 gfs2_glock_put(io_gl);
197fail_put:
198 ip->i_gl->gl_object = NULL;
199 gfs2_glock_put(ip->i_gl);
200fail:
201 iget_failed(inode);
202 return ERR_PTR(error);
203}
204
205struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
206 u64 *no_formal_ino, unsigned int blktype)
207{
208 struct super_block *sb = sdp->sd_vfs;
209 struct gfs2_holder i_gh;
210 struct inode *inode = NULL;
211 int error;
212
213 /* Must not read in block until block type is verified */
214 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
215 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
216 if (error)
217 return ERR_PTR(error);
218
219 error = gfs2_check_blk_type(sdp, no_addr, blktype);
220 if (error)
221 goto fail;
222
223 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
224 if (IS_ERR(inode))
225 goto fail;
226
227 /* Two extra checks for NFS only */
228 if (no_formal_ino) {
229 error = -ESTALE;
230 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
231 goto fail_iput;
232
233 error = -EIO;
234 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
235 goto fail_iput;
236
237 error = 0;
238 }
239
240fail:
241 gfs2_glock_dq_uninit(&i_gh);
242 return error ? ERR_PTR(error) : inode;
243fail_iput:
244 iput(inode);
245 goto fail;
246}
247
248
249struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
250{
251 struct qstr qstr;
252 struct inode *inode;
253 gfs2_str2qstr(&qstr, name);
254 inode = gfs2_lookupi(dip, &qstr, 1);
255 /* gfs2_lookupi has inconsistent callers: vfs
256 * related routines expect NULL for no entry found,
257 * gfs2_lookup_simple callers expect ENOENT
258 * and do not check for NULL.
259 */
260 if (inode == NULL)
261 return ERR_PTR(-ENOENT);
262 else
263 return inode;
264}
265
266
267/**
268 * gfs2_lookupi - Look up a filename in a directory and return its inode
269 * @d_gh: An initialized holder for the directory glock
270 * @name: The name of the inode to look for
271 * @is_root: If 1, ignore the caller's permissions
272 * @i_gh: An uninitialized holder for the new inode glock
273 *
274 * This can be called via the VFS filldir function when NFS is doing
275 * a readdirplus and the inode which its intending to stat isn't
276 * already in cache. In this case we must not take the directory glock
277 * again, since the readdir call will have already taken that lock.
278 *
279 * Returns: errno
280 */
281
282struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
283 int is_root)
284{
285 struct super_block *sb = dir->i_sb;
286 struct gfs2_inode *dip = GFS2_I(dir);
287 struct gfs2_holder d_gh;
288 int error = 0;
289 struct inode *inode = NULL;
290 int unlock = 0;
291
292 if (!name->len || name->len > GFS2_FNAMESIZE)
293 return ERR_PTR(-ENAMETOOLONG);
294
295 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
296 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
297 dir == sb->s_root->d_inode)) {
298 igrab(dir);
299 return dir;
300 }
301
302 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
303 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
304 if (error)
305 return ERR_PTR(error);
306 unlock = 1;
307 }
308
309 if (!is_root) {
310 error = gfs2_permission(dir, MAY_EXEC, 0);
311 if (error)
312 goto out;
313 }
314
315 inode = gfs2_dir_search(dir, name);
316 if (IS_ERR(inode))
317 error = PTR_ERR(inode);
318out:
319 if (unlock)
320 gfs2_glock_dq_uninit(&d_gh);
321 if (error == -ENOENT)
322 return NULL;
323 return inode ? inode : ERR_PTR(error);
324}
325
326/**
327 * create_ok - OK to create a new on-disk inode here?
328 * @dip: Directory in which dinode is to be created
329 * @name: Name of new dinode
330 * @mode:
331 *
332 * Returns: errno
333 */
334
335static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
336 unsigned int mode)
337{
338 int error;
339
340 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0);
341 if (error)
342 return error;
343
344 /* Don't create entries in an unlinked directory */
345 if (!dip->i_inode.i_nlink)
346 return -ENOENT;
347
348 error = gfs2_dir_check(&dip->i_inode, name, NULL);
349 switch (error) {
350 case -ENOENT:
351 error = 0;
352 break;
353 case 0:
354 return -EEXIST;
355 default:
356 return error;
357 }
358
359 if (dip->i_entries == (u32)-1)
360 return -EFBIG;
361 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
362 return -EMLINK;
363
364 return 0;
365}
366
367static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
368 unsigned int *uid, unsigned int *gid)
369{
370 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
371 (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
372 if (S_ISDIR(*mode))
373 *mode |= S_ISUID;
374 else if (dip->i_inode.i_uid != current_fsuid())
375 *mode &= ~07111;
376 *uid = dip->i_inode.i_uid;
377 } else
378 *uid = current_fsuid();
379
380 if (dip->i_inode.i_mode & S_ISGID) {
381 if (S_ISDIR(*mode))
382 *mode |= S_ISGID;
383 *gid = dip->i_inode.i_gid;
384 } else
385 *gid = current_fsgid();
386}
387
388static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
389{
390 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
391 int error;
392
393 if (gfs2_alloc_get(dip) == NULL)
394 return -ENOMEM;
395
396 dip->i_alloc->al_requested = RES_DINODE;
397 error = gfs2_inplace_reserve(dip);
398 if (error)
399 goto out;
400
401 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
402 if (error)
403 goto out_ipreserv;
404
405 error = gfs2_alloc_di(dip, no_addr, generation);
406
407 gfs2_trans_end(sdp);
408
409out_ipreserv:
410 gfs2_inplace_release(dip);
411out:
412 gfs2_alloc_put(dip);
413 return error;
414}
415
416/**
417 * init_dinode - Fill in a new dinode structure
418 * @dip: the directory this inode is being created in
419 * @gl: The glock covering the new inode
420 * @inum: the inode number
421 * @mode: the file permissions
422 * @uid:
423 * @gid:
424 *
425 */
426
427static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
428 const struct gfs2_inum_host *inum, unsigned int mode,
429 unsigned int uid, unsigned int gid,
430 const u64 *generation, dev_t dev, struct buffer_head **bhp)
431{
432 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
433 struct gfs2_dinode *di;
434 struct buffer_head *dibh;
435 struct timespec tv = CURRENT_TIME;
436
437 dibh = gfs2_meta_new(gl, inum->no_addr);
438 gfs2_trans_add_bh(gl, dibh, 1);
439 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
440 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
441 di = (struct gfs2_dinode *)dibh->b_data;
442
443 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
444 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
445 di->di_mode = cpu_to_be32(mode);
446 di->di_uid = cpu_to_be32(uid);
447 di->di_gid = cpu_to_be32(gid);
448 di->di_nlink = 0;
449 di->di_size = 0;
450 di->di_blocks = cpu_to_be64(1);
451 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec);
452 di->di_major = cpu_to_be32(MAJOR(dev));
453 di->di_minor = cpu_to_be32(MINOR(dev));
454 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
455 di->di_generation = cpu_to_be64(*generation);
456 di->di_flags = 0;
457
458 if (S_ISREG(mode)) {
459 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
460 gfs2_tune_get(sdp, gt_new_files_jdata))
461 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
462 } else if (S_ISDIR(mode)) {
463 di->di_flags |= cpu_to_be32(dip->i_diskflags &
464 GFS2_DIF_INHERIT_JDATA);
465 }
466
467 di->__pad1 = 0;
468 di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
469 di->di_height = 0;
470 di->__pad2 = 0;
471 di->__pad3 = 0;
472 di->di_depth = 0;
473 di->di_entries = 0;
474 memset(&di->__pad4, 0, sizeof(di->__pad4));
475 di->di_eattr = 0;
476 di->di_atime_nsec = cpu_to_be32(tv.tv_nsec);
477 di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec);
478 di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec);
479 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
480
481 set_buffer_uptodate(dibh);
482
483 *bhp = dibh;
484}
485
486static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
487 unsigned int mode, const struct gfs2_inum_host *inum,
488 const u64 *generation, dev_t dev, struct buffer_head **bhp)
489{
490 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
491 unsigned int uid, gid;
492 int error;
493
494 munge_mode_uid_gid(dip, &mode, &uid, &gid);
495 if (!gfs2_alloc_get(dip))
496 return -ENOMEM;
497
498 error = gfs2_quota_lock(dip, uid, gid);
499 if (error)
500 goto out;
501
502 error = gfs2_quota_check(dip, uid, gid);
503 if (error)
504 goto out_quota;
505
506 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
507 if (error)
508 goto out_quota;
509
510 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, bhp);
511 gfs2_quota_change(dip, +1, uid, gid);
512 gfs2_trans_end(sdp);
513
514out_quota:
515 gfs2_quota_unlock(dip);
516out:
517 gfs2_alloc_put(dip);
518 return error;
519}
520
521static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
522 struct gfs2_inode *ip)
523{
524 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
525 struct gfs2_alloc *al;
526 int alloc_required;
527 struct buffer_head *dibh;
528 int error;
529
530 al = gfs2_alloc_get(dip);
531 if (!al)
532 return -ENOMEM;
533
534 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
535 if (error)
536 goto fail;
537
538 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
539 if (alloc_required < 0)
540 goto fail_quota_locks;
541 if (alloc_required) {
542 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
543 if (error)
544 goto fail_quota_locks;
545
546 al->al_requested = sdp->sd_max_dirres;
547
548 error = gfs2_inplace_reserve(dip);
549 if (error)
550 goto fail_quota_locks;
551
552 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
553 al->al_rgd->rd_length +
554 2 * RES_DINODE +
555 RES_STATFS + RES_QUOTA, 0);
556 if (error)
557 goto fail_ipreserv;
558 } else {
559 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
560 if (error)
561 goto fail_quota_locks;
562 }
563
564 error = gfs2_dir_add(&dip->i_inode, name, ip);
565 if (error)
566 goto fail_end_trans;
567
568 error = gfs2_meta_inode_buffer(ip, &dibh);
569 if (error)
570 goto fail_end_trans;
571 ip->i_inode.i_nlink = 1;
572 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
573 gfs2_dinode_out(ip, dibh->b_data);
574 brelse(dibh);
575 return 0;
576
577fail_end_trans:
578 gfs2_trans_end(sdp);
579
580fail_ipreserv:
581 if (dip->i_alloc->al_rgd)
582 gfs2_inplace_release(dip);
583
584fail_quota_locks:
585 gfs2_quota_unlock(dip);
586
587fail:
588 gfs2_alloc_put(dip);
589 return error;
590}
591
592static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
593 const struct qstr *qstr)
594{
595 int err;
596 size_t len;
597 void *value;
598 char *name;
599
600 err = security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
601 &name, &value, &len);
602
603 if (err) {
604 if (err == -EOPNOTSUPP)
605 return 0;
606 return err;
607 }
608
609 err = __gfs2_xattr_set(&ip->i_inode, name, value, len, 0,
610 GFS2_EATYPE_SECURITY);
611 kfree(value);
612 kfree(name);
613
614 return err;
615}
616
617/**
618 * gfs2_createi - Create a new inode
619 * @ghs: An array of two holders
620 * @name: The name of the new file
621 * @mode: the permissions on the new inode
622 *
623 * @ghs[0] is an initialized holder for the directory
624 * @ghs[1] is the holder for the inode lock
625 *
626 * If the return value is not NULL, the glocks on both the directory and the new
627 * file are held. A transaction has been started and an inplace reservation
628 * is held, as well.
629 *
630 * Returns: An inode
631 */
632
633struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
634 unsigned int mode, dev_t dev)
635{
636 struct inode *inode = NULL;
637 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
638 struct inode *dir = &dip->i_inode;
639 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
640 struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
641 int error;
642 u64 generation;
643 struct buffer_head *bh = NULL;
644
645 if (!name->len || name->len > GFS2_FNAMESIZE)
646 return ERR_PTR(-ENAMETOOLONG);
647
648 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
649 error = gfs2_glock_nq(ghs);
650 if (error)
651 goto fail;
652
653 error = create_ok(dip, name, mode);
654 if (error)
655 goto fail_gunlock;
656
657 error = alloc_dinode(dip, &inum.no_addr, &generation);
658 if (error)
659 goto fail_gunlock;
660 inum.no_formal_ino = generation;
661
662 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
663 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
664 if (error)
665 goto fail_gunlock;
666
667 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, &bh);
668 if (error)
669 goto fail_gunlock2;
670
671 inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr,
672 inum.no_formal_ino, 0);
673 if (IS_ERR(inode))
674 goto fail_gunlock2;
675
676 error = gfs2_inode_refresh(GFS2_I(inode));
677 if (error)
678 goto fail_gunlock2;
679
680 error = gfs2_acl_create(dip, inode);
681 if (error)
682 goto fail_gunlock2;
683
684 error = gfs2_security_init(dip, GFS2_I(inode), name);
685 if (error)
686 goto fail_gunlock2;
687
688 error = link_dinode(dip, name, GFS2_I(inode));
689 if (error)
690 goto fail_gunlock2;
691
692 if (bh)
693 brelse(bh);
694 return inode;
695
696fail_gunlock2:
697 gfs2_glock_dq_uninit(ghs + 1);
698 if (inode && !IS_ERR(inode))
699 iput(inode);
700fail_gunlock:
701 gfs2_glock_dq(ghs);
702fail:
703 if (bh)
704 brelse(bh);
705 return ERR_PTR(error);
706}
707/**
708 * gfs2_create - Create a file
709 * @dir: The directory in which to create the file
710 * @dentry: The dentry of the new file
711 * @mode: The mode of the new file
712 *
713 * Returns: errno
714 */
715
716static int gfs2_create(struct inode *dir, struct dentry *dentry,
717 int mode, struct nameidata *nd)
718{
719 struct gfs2_inode *dip = GFS2_I(dir);
720 struct gfs2_sbd *sdp = GFS2_SB(dir);
721 struct gfs2_holder ghs[2];
722 struct inode *inode;
723
724 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
725
726 for (;;) {
727 inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0);
728 if (!IS_ERR(inode)) {
729 gfs2_trans_end(sdp);
730 if (dip->i_alloc->al_rgd)
731 gfs2_inplace_release(dip);
732 gfs2_quota_unlock(dip);
733 gfs2_alloc_put(dip);
734 gfs2_glock_dq_uninit_m(2, ghs);
735 mark_inode_dirty(inode);
736 break;
737 } else if (PTR_ERR(inode) != -EEXIST ||
738 (nd && nd->flags & LOOKUP_EXCL)) {
739 gfs2_holder_uninit(ghs);
740 return PTR_ERR(inode);
741 }
742
743 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
744 if (inode) {
745 if (!IS_ERR(inode)) {
746 gfs2_holder_uninit(ghs);
747 break;
748 } else {
749 gfs2_holder_uninit(ghs);
750 return PTR_ERR(inode);
751 }
752 }
753 }
754
755 d_instantiate(dentry, inode);
756
757 return 0;
758}
759
760/**
761 * gfs2_lookup - Look up a filename in a directory and return its inode
762 * @dir: The directory inode
763 * @dentry: The dentry of the new inode
764 * @nd: passed from Linux VFS, ignored by us
765 *
766 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
767 *
768 * Returns: errno
769 */
770
771static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
772 struct nameidata *nd)
773{
774 struct inode *inode = NULL;
775
776 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
777 if (inode && IS_ERR(inode))
778 return ERR_CAST(inode);
779
780 if (inode) {
781 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
782 struct gfs2_holder gh;
783 int error;
784 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
785 if (error) {
786 iput(inode);
787 return ERR_PTR(error);
788 }
789 gfs2_glock_dq_uninit(&gh);
790 return d_splice_alias(inode, dentry);
791 }
792 d_add(dentry, inode);
793
794 return NULL;
795}
796
797/**
798 * gfs2_link - Link to a file
799 * @old_dentry: The inode to link
800 * @dir: Add link to this directory
801 * @dentry: The name of the link
802 *
803 * Link the inode in "old_dentry" into the directory "dir" with the
804 * name in "dentry".
805 *
806 * Returns: errno
807 */
808
809static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
810 struct dentry *dentry)
811{
812 struct gfs2_inode *dip = GFS2_I(dir);
813 struct gfs2_sbd *sdp = GFS2_SB(dir);
814 struct inode *inode = old_dentry->d_inode;
815 struct gfs2_inode *ip = GFS2_I(inode);
816 struct gfs2_holder ghs[2];
817 struct buffer_head *dibh;
818 int alloc_required;
819 int error;
820
821 if (S_ISDIR(inode->i_mode))
822 return -EPERM;
823
824 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
825 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
826
827 error = gfs2_glock_nq(ghs); /* parent */
828 if (error)
829 goto out_parent;
830
831 error = gfs2_glock_nq(ghs + 1); /* child */
832 if (error)
833 goto out_child;
834
835 error = -ENOENT;
836 if (inode->i_nlink == 0)
837 goto out_gunlock;
838
839 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC, 0);
840 if (error)
841 goto out_gunlock;
842
843 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
844 switch (error) {
845 case -ENOENT:
846 break;
847 case 0:
848 error = -EEXIST;
849 default:
850 goto out_gunlock;
851 }
852
853 error = -EINVAL;
854 if (!dip->i_inode.i_nlink)
855 goto out_gunlock;
856 error = -EFBIG;
857 if (dip->i_entries == (u32)-1)
858 goto out_gunlock;
859 error = -EPERM;
860 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
861 goto out_gunlock;
862 error = -EINVAL;
863 if (!ip->i_inode.i_nlink)
864 goto out_gunlock;
865 error = -EMLINK;
866 if (ip->i_inode.i_nlink == (u32)-1)
867 goto out_gunlock;
868
869 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
870 if (error < 0)
871 goto out_gunlock;
872 error = 0;
873
874 if (alloc_required) {
875 struct gfs2_alloc *al = gfs2_alloc_get(dip);
876 if (!al) {
877 error = -ENOMEM;
878 goto out_gunlock;
879 }
880
881 error = gfs2_quota_lock_check(dip);
882 if (error)
883 goto out_alloc;
884
885 al->al_requested = sdp->sd_max_dirres;
886
887 error = gfs2_inplace_reserve(dip);
888 if (error)
889 goto out_gunlock_q;
890
891 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
892 gfs2_rg_blocks(al) +
893 2 * RES_DINODE + RES_STATFS +
894 RES_QUOTA, 0);
895 if (error)
896 goto out_ipres;
897 } else {
898 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
899 if (error)
900 goto out_ipres;
901 }
902
903 error = gfs2_meta_inode_buffer(ip, &dibh);
904 if (error)
905 goto out_end_trans;
906
907 error = gfs2_dir_add(dir, &dentry->d_name, ip);
908 if (error)
909 goto out_brelse;
910
911 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
912 inc_nlink(&ip->i_inode);
913 ip->i_inode.i_ctime = CURRENT_TIME;
914 gfs2_dinode_out(ip, dibh->b_data);
915 mark_inode_dirty(&ip->i_inode);
916
917out_brelse:
918 brelse(dibh);
919out_end_trans:
920 gfs2_trans_end(sdp);
921out_ipres:
922 if (alloc_required)
923 gfs2_inplace_release(dip);
924out_gunlock_q:
925 if (alloc_required)
926 gfs2_quota_unlock(dip);
927out_alloc:
928 if (alloc_required)
929 gfs2_alloc_put(dip);
930out_gunlock:
931 gfs2_glock_dq(ghs + 1);
932out_child:
933 gfs2_glock_dq(ghs);
934out_parent:
935 gfs2_holder_uninit(ghs);
936 gfs2_holder_uninit(ghs + 1);
937 if (!error) {
938 ihold(inode);
939 d_instantiate(dentry, inode);
940 mark_inode_dirty(inode);
941 }
942 return error;
943}
944
945/*
946 * gfs2_unlink_ok - check to see that a inode is still in a directory
947 * @dip: the directory
948 * @name: the name of the file
949 * @ip: the inode
950 *
951 * Assumes that the lock on (at least) @dip is held.
952 *
953 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
954 */
955
956static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
957 const struct gfs2_inode *ip)
958{
959 int error;
960
961 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
962 return -EPERM;
963
964 if ((dip->i_inode.i_mode & S_ISVTX) &&
965 dip->i_inode.i_uid != current_fsuid() &&
966 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
967 return -EPERM;
968
969 if (IS_APPEND(&dip->i_inode))
970 return -EPERM;
971
972 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0);
973 if (error)
974 return error;
975
976 error = gfs2_dir_check(&dip->i_inode, name, ip);
977 if (error)
978 return error;
979
980 return 0;
981}
982
983/**
984 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
985 * @dip: The parent directory
986 * @name: The name of the entry in the parent directory
987 * @bh: The inode buffer for the inode to be removed
988 * @inode: The inode to be removed
989 *
990 * Called with all the locks and in a transaction. This will only be
991 * called for a directory after it has been checked to ensure it is empty.
992 *
993 * Returns: 0 on success, or an error
994 */
995
996static int gfs2_unlink_inode(struct gfs2_inode *dip,
997 const struct dentry *dentry,
998 struct buffer_head *bh)
999{
1000 struct inode *inode = dentry->d_inode;
1001 struct gfs2_inode *ip = GFS2_I(inode);
1002 int error;
1003
1004 error = gfs2_dir_del(dip, dentry);
1005 if (error)
1006 return error;
1007
1008 ip->i_entries = 0;
1009 inode->i_ctime = CURRENT_TIME;
1010 if (S_ISDIR(inode->i_mode))
1011 clear_nlink(inode);
1012 else
1013 drop_nlink(inode);
1014 gfs2_trans_add_bh(ip->i_gl, bh, 1);
1015 gfs2_dinode_out(ip, bh->b_data);
1016 mark_inode_dirty(inode);
1017 if (inode->i_nlink == 0)
1018 gfs2_unlink_di(inode);
1019 return 0;
1020}
1021
1022
1023/**
1024 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1025 * @dir: The inode of the directory containing the inode to unlink
1026 * @dentry: The file itself
1027 *
1028 * This routine uses the type of the inode as a flag to figure out
1029 * whether this is an unlink or an rmdir.
1030 *
1031 * Returns: errno
1032 */
1033
1034static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1035{
1036 struct gfs2_inode *dip = GFS2_I(dir);
1037 struct gfs2_sbd *sdp = GFS2_SB(dir);
1038 struct inode *inode = dentry->d_inode;
1039 struct gfs2_inode *ip = GFS2_I(inode);
1040 struct buffer_head *bh;
1041 struct gfs2_holder ghs[3];
1042 struct gfs2_rgrpd *rgd;
1043 struct gfs2_holder ri_gh;
1044 int error;
1045
1046 error = gfs2_rindex_hold(sdp, &ri_gh);
1047 if (error)
1048 return error;
1049
1050 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1051 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1052
1053 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
1054 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1055
1056
1057 error = gfs2_glock_nq(ghs); /* parent */
1058 if (error)
1059 goto out_parent;
1060
1061 error = gfs2_glock_nq(ghs + 1); /* child */
1062 if (error)
1063 goto out_child;
1064
1065 error = -ENOENT;
1066 if (inode->i_nlink == 0)
1067 goto out_rgrp;
1068
1069 if (S_ISDIR(inode->i_mode)) {
1070 error = -ENOTEMPTY;
1071 if (ip->i_entries > 2 || inode->i_nlink > 2)
1072 goto out_rgrp;
1073 }
1074
1075 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1076 if (error)
1077 goto out_rgrp;
1078
1079 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1080 if (error)
1081 goto out_gunlock;
1082
1083 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1084 if (error)
1085 goto out_gunlock;
1086
1087 error = gfs2_meta_inode_buffer(ip, &bh);
1088 if (error)
1089 goto out_end_trans;
1090
1091 error = gfs2_unlink_inode(dip, dentry, bh);
1092 brelse(bh);
1093
1094out_end_trans:
1095 gfs2_trans_end(sdp);
1096out_gunlock:
1097 gfs2_glock_dq(ghs + 2);
1098out_rgrp:
1099 gfs2_holder_uninit(ghs + 2);
1100 gfs2_glock_dq(ghs + 1);
1101out_child:
1102 gfs2_holder_uninit(ghs + 1);
1103 gfs2_glock_dq(ghs);
1104out_parent:
1105 gfs2_holder_uninit(ghs);
1106 gfs2_glock_dq_uninit(&ri_gh);
1107 return error;
1108}
1109
1110/**
1111 * gfs2_symlink - Create a symlink
1112 * @dir: The directory to create the symlink in
1113 * @dentry: The dentry to put the symlink in
1114 * @symname: The thing which the link points to
1115 *
1116 * Returns: errno
1117 */
1118
1119static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1120 const char *symname)
1121{
1122 struct gfs2_inode *dip = GFS2_I(dir), *ip;
1123 struct gfs2_sbd *sdp = GFS2_SB(dir);
1124 struct gfs2_holder ghs[2];
1125 struct inode *inode;
1126 struct buffer_head *dibh;
1127 int size;
1128 int error;
1129
1130 /* Must be stuffed with a null terminator for gfs2_follow_link() */
1131 size = strlen(symname);
1132 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1133 return -ENAMETOOLONG;
1134
1135 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
1136
1137 inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0);
1138 if (IS_ERR(inode)) {
1139 gfs2_holder_uninit(ghs);
1140 return PTR_ERR(inode);
1141 }
1142
1143 ip = ghs[1].gh_gl->gl_object;
1144
1145 i_size_write(inode, size);
1146
1147 error = gfs2_meta_inode_buffer(ip, &dibh);
1148
1149 if (!gfs2_assert_withdraw(sdp, !error)) {
1150 gfs2_dinode_out(ip, dibh->b_data);
1151 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
1152 size);
1153 brelse(dibh);
1154 }
1155
1156 gfs2_trans_end(sdp);
1157 if (dip->i_alloc->al_rgd)
1158 gfs2_inplace_release(dip);
1159 gfs2_quota_unlock(dip);
1160 gfs2_alloc_put(dip);
1161
1162 gfs2_glock_dq_uninit_m(2, ghs);
1163
1164 d_instantiate(dentry, inode);
1165 mark_inode_dirty(inode);
1166
1167 return 0;
1168}
1169
1170/**
1171 * gfs2_mkdir - Make a directory
1172 * @dir: The parent directory of the new one
1173 * @dentry: The dentry of the new directory
1174 * @mode: The mode of the new directory
1175 *
1176 * Returns: errno
1177 */
1178
1179static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1180{
1181 struct gfs2_inode *dip = GFS2_I(dir), *ip;
1182 struct gfs2_sbd *sdp = GFS2_SB(dir);
1183 struct gfs2_holder ghs[2];
1184 struct inode *inode;
1185 struct buffer_head *dibh;
1186 int error;
1187
1188 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
1189
1190 inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0);
1191 if (IS_ERR(inode)) {
1192 gfs2_holder_uninit(ghs);
1193 return PTR_ERR(inode);
1194 }
1195
1196 ip = ghs[1].gh_gl->gl_object;
1197
1198 ip->i_inode.i_nlink = 2;
1199 i_size_write(inode, sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode));
1200 ip->i_diskflags |= GFS2_DIF_JDATA;
1201 ip->i_entries = 2;
1202
1203 error = gfs2_meta_inode_buffer(ip, &dibh);
1204
1205 if (!gfs2_assert_withdraw(sdp, !error)) {
1206 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
1207 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
1208
1209 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1210 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
1211 dent->de_inum = di->di_num; /* already GFS2 endian */
1212 dent->de_type = cpu_to_be16(DT_DIR);
1213 di->di_entries = cpu_to_be32(1);
1214
1215 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
1216 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
1217
1218 gfs2_inum_out(dip, dent);
1219 dent->de_type = cpu_to_be16(DT_DIR);
1220
1221 gfs2_dinode_out(ip, di);
1222
1223 brelse(dibh);
1224 }
1225
1226 gfs2_trans_end(sdp);
1227 if (dip->i_alloc->al_rgd)
1228 gfs2_inplace_release(dip);
1229 gfs2_quota_unlock(dip);
1230 gfs2_alloc_put(dip);
1231
1232 gfs2_glock_dq_uninit_m(2, ghs);
1233
1234 d_instantiate(dentry, inode);
1235 mark_inode_dirty(inode);
1236
1237 return 0;
1238}
1239
1240/**
1241 * gfs2_mknod - Make a special file
1242 * @dir: The directory in which the special file will reside
1243 * @dentry: The dentry of the special file
1244 * @mode: The mode of the special file
1245 * @rdev: The device specification of the special file
1246 *
1247 */
1248
1249static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
1250 dev_t dev)
1251{
1252 struct gfs2_inode *dip = GFS2_I(dir);
1253 struct gfs2_sbd *sdp = GFS2_SB(dir);
1254 struct gfs2_holder ghs[2];
1255 struct inode *inode;
1256
1257 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
1258
1259 inode = gfs2_createi(ghs, &dentry->d_name, mode, dev);
1260 if (IS_ERR(inode)) {
1261 gfs2_holder_uninit(ghs);
1262 return PTR_ERR(inode);
1263 }
1264
1265 gfs2_trans_end(sdp);
1266 if (dip->i_alloc->al_rgd)
1267 gfs2_inplace_release(dip);
1268 gfs2_quota_unlock(dip);
1269 gfs2_alloc_put(dip);
1270
1271 gfs2_glock_dq_uninit_m(2, ghs);
1272
1273 d_instantiate(dentry, inode);
1274 mark_inode_dirty(inode);
1275
1276 return 0;
1277}
1278
1279/*
1280 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1281 * @this: move this
1282 * @to: to here
1283 *
1284 * Follow @to back to the root and make sure we don't encounter @this
1285 * Assumes we already hold the rename lock.
1286 *
1287 * Returns: errno
1288 */
1289
1290static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1291{
1292 struct inode *dir = &to->i_inode;
1293 struct super_block *sb = dir->i_sb;
1294 struct inode *tmp;
1295 int error = 0;
1296
1297 igrab(dir);
1298
1299 for (;;) {
1300 if (dir == &this->i_inode) {
1301 error = -EINVAL;
1302 break;
1303 }
1304 if (dir == sb->s_root->d_inode) {
1305 error = 0;
1306 break;
1307 }
1308
1309 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1310 if (IS_ERR(tmp)) {
1311 error = PTR_ERR(tmp);
1312 break;
1313 }
1314
1315 iput(dir);
1316 dir = tmp;
1317 }
1318
1319 iput(dir);
1320
1321 return error;
1322}
1323
1324/**
1325 * gfs2_rename - Rename a file
1326 * @odir: Parent directory of old file name
1327 * @odentry: The old dentry of the file
1328 * @ndir: Parent directory of new file name
1329 * @ndentry: The new dentry of the file
1330 *
1331 * Returns: errno
1332 */
1333
1334static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1335 struct inode *ndir, struct dentry *ndentry)
1336{
1337 struct gfs2_inode *odip = GFS2_I(odir);
1338 struct gfs2_inode *ndip = GFS2_I(ndir);
1339 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1340 struct gfs2_inode *nip = NULL;
1341 struct gfs2_sbd *sdp = GFS2_SB(odir);
1342 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }, ri_gh;
1343 struct gfs2_rgrpd *nrgd;
1344 unsigned int num_gh;
1345 int dir_rename = 0;
1346 int alloc_required = 0;
1347 unsigned int x;
1348 int error;
1349
1350 if (ndentry->d_inode) {
1351 nip = GFS2_I(ndentry->d_inode);
1352 if (ip == nip)
1353 return 0;
1354 }
1355
1356 error = gfs2_rindex_hold(sdp, &ri_gh);
1357 if (error)
1358 return error;
1359
1360 if (odip != ndip) {
1361 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1362 0, &r_gh);
1363 if (error)
1364 goto out;
1365
1366 if (S_ISDIR(ip->i_inode.i_mode)) {
1367 dir_rename = 1;
1368 /* don't move a dirctory into it's subdir */
1369 error = gfs2_ok_to_move(ip, ndip);
1370 if (error)
1371 goto out_gunlock_r;
1372 }
1373 }
1374
1375 num_gh = 1;
1376 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1377 if (odip != ndip) {
1378 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1379 num_gh++;
1380 }
1381 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1382 num_gh++;
1383
1384 if (nip) {
1385 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1386 num_gh++;
1387 /* grab the resource lock for unlink flag twiddling
1388 * this is the case of the target file already existing
1389 * so we unlink before doing the rename
1390 */
1391 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
1392 if (nrgd)
1393 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1394 }
1395
1396 for (x = 0; x < num_gh; x++) {
1397 error = gfs2_glock_nq(ghs + x);
1398 if (error)
1399 goto out_gunlock;
1400 }
1401
1402 error = -ENOENT;
1403 if (ip->i_inode.i_nlink == 0)
1404 goto out_gunlock;
1405
1406 /* Check out the old directory */
1407
1408 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1409 if (error)
1410 goto out_gunlock;
1411
1412 /* Check out the new directory */
1413
1414 if (nip) {
1415 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1416 if (error)
1417 goto out_gunlock;
1418
1419 if (nip->i_inode.i_nlink == 0) {
1420 error = -EAGAIN;
1421 goto out_gunlock;
1422 }
1423
1424 if (S_ISDIR(nip->i_inode.i_mode)) {
1425 if (nip->i_entries < 2) {
1426 gfs2_consist_inode(nip);
1427 error = -EIO;
1428 goto out_gunlock;
1429 }
1430 if (nip->i_entries > 2) {
1431 error = -ENOTEMPTY;
1432 goto out_gunlock;
1433 }
1434 }
1435 } else {
1436 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC, 0);
1437 if (error)
1438 goto out_gunlock;
1439
1440 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1441 switch (error) {
1442 case -ENOENT:
1443 error = 0;
1444 break;
1445 case 0:
1446 error = -EEXIST;
1447 default:
1448 goto out_gunlock;
1449 };
1450
1451 if (odip != ndip) {
1452 if (!ndip->i_inode.i_nlink) {
1453 error = -ENOENT;
1454 goto out_gunlock;
1455 }
1456 if (ndip->i_entries == (u32)-1) {
1457 error = -EFBIG;
1458 goto out_gunlock;
1459 }
1460 if (S_ISDIR(ip->i_inode.i_mode) &&
1461 ndip->i_inode.i_nlink == (u32)-1) {
1462 error = -EMLINK;
1463 goto out_gunlock;
1464 }
1465 }
1466 }
1467
1468 /* Check out the dir to be renamed */
1469
1470 if (dir_rename) {
1471 error = gfs2_permission(odentry->d_inode, MAY_WRITE, 0);
1472 if (error)
1473 goto out_gunlock;
1474 }
1475
1476 if (nip == NULL)
1477 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1478 error = alloc_required;
1479 if (error < 0)
1480 goto out_gunlock;
1481 error = 0;
1482
1483 if (alloc_required) {
1484 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
1485 if (!al) {
1486 error = -ENOMEM;
1487 goto out_gunlock;
1488 }
1489
1490 error = gfs2_quota_lock_check(ndip);
1491 if (error)
1492 goto out_alloc;
1493
1494 al->al_requested = sdp->sd_max_dirres;
1495
1496 error = gfs2_inplace_reserve_ri(ndip);
1497 if (error)
1498 goto out_gunlock_q;
1499
1500 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1501 gfs2_rg_blocks(al) +
1502 4 * RES_DINODE + 4 * RES_LEAF +
1503 RES_STATFS + RES_QUOTA + 4, 0);
1504 if (error)
1505 goto out_ipreserv;
1506 } else {
1507 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1508 5 * RES_LEAF + 4, 0);
1509 if (error)
1510 goto out_gunlock;
1511 }
1512
1513 /* Remove the target file, if it exists */
1514
1515 if (nip) {
1516 struct buffer_head *bh;
1517 error = gfs2_meta_inode_buffer(nip, &bh);
1518 if (error)
1519 goto out_end_trans;
1520 error = gfs2_unlink_inode(ndip, ndentry, bh);
1521 brelse(bh);
1522 }
1523
1524 if (dir_rename) {
1525 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1526 if (error)
1527 goto out_end_trans;
1528 } else {
1529 struct buffer_head *dibh;
1530 error = gfs2_meta_inode_buffer(ip, &dibh);
1531 if (error)
1532 goto out_end_trans;
1533 ip->i_inode.i_ctime = CURRENT_TIME;
1534 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1535 gfs2_dinode_out(ip, dibh->b_data);
1536 brelse(dibh);
1537 }
1538
1539 error = gfs2_dir_del(odip, odentry);
1540 if (error)
1541 goto out_end_trans;
1542
1543 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1544 if (error)
1545 goto out_end_trans;
1546
1547out_end_trans:
1548 gfs2_trans_end(sdp);
1549out_ipreserv:
1550 if (alloc_required)
1551 gfs2_inplace_release(ndip);
1552out_gunlock_q:
1553 if (alloc_required)
1554 gfs2_quota_unlock(ndip);
1555out_alloc:
1556 if (alloc_required)
1557 gfs2_alloc_put(ndip);
1558out_gunlock:
1559 while (x--) {
1560 gfs2_glock_dq(ghs + x);
1561 gfs2_holder_uninit(ghs + x);
1562 }
1563out_gunlock_r:
1564 if (r_gh.gh_gl)
1565 gfs2_glock_dq_uninit(&r_gh);
1566out:
1567 gfs2_glock_dq_uninit(&ri_gh);
1568 return error;
1569}
1570
1571/**
1572 * gfs2_follow_link - Follow a symbolic link
1573 * @dentry: The dentry of the link
1574 * @nd: Data that we pass to vfs_follow_link()
1575 *
1576 * This can handle symlinks of any size.
1577 *
1578 * Returns: 0 on success or error code
1579 */
1580
1581static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1582{
1583 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1584 struct gfs2_holder i_gh;
1585 struct buffer_head *dibh;
1586 unsigned int x, size;
1587 char *buf;
1588 int error;
1589
1590 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1591 error = gfs2_glock_nq(&i_gh);
1592 if (error) {
1593 gfs2_holder_uninit(&i_gh);
1594 nd_set_link(nd, ERR_PTR(error));
1595 return NULL;
1596 }
1597
1598 size = (unsigned int)i_size_read(&ip->i_inode);
1599 if (size == 0) {
1600 gfs2_consist_inode(ip);
1601 buf = ERR_PTR(-EIO);
1602 goto out;
1603 }
1604
1605 error = gfs2_meta_inode_buffer(ip, &dibh);
1606 if (error) {
1607 buf = ERR_PTR(error);
1608 goto out;
1609 }
1610
1611 x = size + 1;
1612 buf = kmalloc(x, GFP_NOFS);
1613 if (!buf)
1614 buf = ERR_PTR(-ENOMEM);
1615 else
1616 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1617 brelse(dibh);
1618out:
1619 gfs2_glock_dq_uninit(&i_gh);
1620 nd_set_link(nd, buf);
1621 return NULL;
1622}
1623
1624static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1625{
1626 char *s = nd_get_link(nd);
1627 if (!IS_ERR(s))
1628 kfree(s);
1629}
1630
1631/**
1632 * gfs2_permission -
1633 * @inode: The inode
1634 * @mask: The mask to be tested
1635 * @flags: Indicates whether this is an RCU path walk or not
1636 *
1637 * This may be called from the VFS directly, or from within GFS2 with the
1638 * inode locked, so we look to see if the glock is already locked and only
1639 * lock the glock if its not already been done.
1640 *
1641 * Returns: errno
1642 */
1643
1644int gfs2_permission(struct inode *inode, int mask, unsigned int flags)
1645{
1646 struct gfs2_inode *ip;
1647 struct gfs2_holder i_gh;
1648 int error;
1649 int unlock = 0;
1650
1651
1652 ip = GFS2_I(inode);
1653 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1654 if (flags & IPERM_FLAG_RCU)
1655 return -ECHILD;
1656 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1657 if (error)
1658 return error;
1659 unlock = 1;
1660 }
1661
1662 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1663 error = -EACCES;
1664 else
1665 error = generic_permission(inode, mask, flags, gfs2_check_acl);
1666 if (unlock)
1667 gfs2_glock_dq_uninit(&i_gh);
1668
1669 return error;
1670}
1671
1672static int __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1673{
1674 struct inode *inode = &ip->i_inode;
1675 struct buffer_head *dibh;
1676 int error;
1677
1678 error = gfs2_meta_inode_buffer(ip, &dibh);
1679 if (error)
1680 return error;
1681
1682 setattr_copy(inode, attr);
1683 mark_inode_dirty(inode);
1684 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1685 gfs2_dinode_out(ip, dibh->b_data);
1686 brelse(dibh);
1687 return 0;
1688}
1689
1690/**
1691 * gfs2_setattr_simple -
1692 * @ip:
1693 * @attr:
1694 *
1695 * Returns: errno
1696 */
1697
1698int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1699{
1700 int error;
1701
1702 if (current->journal_info)
1703 return __gfs2_setattr_simple(ip, attr);
1704
1705 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1706 if (error)
1707 return error;
1708
1709 error = __gfs2_setattr_simple(ip, attr);
1710 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1711 return error;
1712}
1713
1714static int setattr_chown(struct inode *inode, struct iattr *attr)
1715{
1716 struct gfs2_inode *ip = GFS2_I(inode);
1717 struct gfs2_sbd *sdp = GFS2_SB(inode);
1718 u32 ouid, ogid, nuid, ngid;
1719 int error;
1720
1721 ouid = inode->i_uid;
1722 ogid = inode->i_gid;
1723 nuid = attr->ia_uid;
1724 ngid = attr->ia_gid;
1725
1726 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1727 ouid = nuid = NO_QUOTA_CHANGE;
1728 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1729 ogid = ngid = NO_QUOTA_CHANGE;
1730
1731 if (!gfs2_alloc_get(ip))
1732 return -ENOMEM;
1733
1734 error = gfs2_quota_lock(ip, nuid, ngid);
1735 if (error)
1736 goto out_alloc;
1737
1738 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1739 error = gfs2_quota_check(ip, nuid, ngid);
1740 if (error)
1741 goto out_gunlock_q;
1742 }
1743
1744 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1745 if (error)
1746 goto out_gunlock_q;
1747
1748 error = gfs2_setattr_simple(ip, attr);
1749 if (error)
1750 goto out_end_trans;
1751
1752 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1753 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1754 gfs2_quota_change(ip, -blocks, ouid, ogid);
1755 gfs2_quota_change(ip, blocks, nuid, ngid);
1756 }
1757
1758out_end_trans:
1759 gfs2_trans_end(sdp);
1760out_gunlock_q:
1761 gfs2_quota_unlock(ip);
1762out_alloc:
1763 gfs2_alloc_put(ip);
1764 return error;
1765}
1766
1767/**
1768 * gfs2_setattr - Change attributes on an inode
1769 * @dentry: The dentry which is changing
1770 * @attr: The structure describing the change
1771 *
1772 * The VFS layer wants to change one or more of an inodes attributes. Write
1773 * that change out to disk.
1774 *
1775 * Returns: errno
1776 */
1777
1778static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1779{
1780 struct inode *inode = dentry->d_inode;
1781 struct gfs2_inode *ip = GFS2_I(inode);
1782 struct gfs2_holder i_gh;
1783 int error;
1784
1785 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1786 if (error)
1787 return error;
1788
1789 error = -EPERM;
1790 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1791 goto out;
1792
1793 error = inode_change_ok(inode, attr);
1794 if (error)
1795 goto out;
1796
1797 if (attr->ia_valid & ATTR_SIZE)
1798 error = gfs2_setattr_size(inode, attr->ia_size);
1799 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1800 error = setattr_chown(inode, attr);
1801 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1802 error = gfs2_acl_chmod(ip, attr);
1803 else
1804 error = gfs2_setattr_simple(ip, attr);
1805
1806out:
1807 gfs2_glock_dq_uninit(&i_gh);
1808 if (!error)
1809 mark_inode_dirty(inode);
1810 return error;
1811}
1812
1813/**
1814 * gfs2_getattr - Read out an inode's attributes
1815 * @mnt: The vfsmount the inode is being accessed from
1816 * @dentry: The dentry to stat
1817 * @stat: The inode's stats
1818 *
1819 * This may be called from the VFS directly, or from within GFS2 with the
1820 * inode locked, so we look to see if the glock is already locked and only
1821 * lock the glock if its not already been done. Note that its the NFS
1822 * readdirplus operation which causes this to be called (from filldir)
1823 * with the glock already held.
1824 *
1825 * Returns: errno
1826 */
1827
1828static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1829 struct kstat *stat)
1830{
1831 struct inode *inode = dentry->d_inode;
1832 struct gfs2_inode *ip = GFS2_I(inode);
1833 struct gfs2_holder gh;
1834 int error;
1835 int unlock = 0;
1836
1837 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1838 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1839 if (error)
1840 return error;
1841 unlock = 1;
1842 }
1843
1844 generic_fillattr(inode, stat);
1845 if (unlock)
1846 gfs2_glock_dq_uninit(&gh);
1847
1848 return 0;
1849}
1850
1851static int gfs2_setxattr(struct dentry *dentry, const char *name,
1852 const void *data, size_t size, int flags)
1853{
1854 struct inode *inode = dentry->d_inode;
1855 struct gfs2_inode *ip = GFS2_I(inode);
1856 struct gfs2_holder gh;
1857 int ret;
1858
1859 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1860 ret = gfs2_glock_nq(&gh);
1861 if (ret == 0) {
1862 ret = generic_setxattr(dentry, name, data, size, flags);
1863 gfs2_glock_dq(&gh);
1864 }
1865 gfs2_holder_uninit(&gh);
1866 return ret;
1867}
1868
1869static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1870 void *data, size_t size)
1871{
1872 struct inode *inode = dentry->d_inode;
1873 struct gfs2_inode *ip = GFS2_I(inode);
1874 struct gfs2_holder gh;
1875 int ret;
1876
1877 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1878 ret = gfs2_glock_nq(&gh);
1879 if (ret == 0) {
1880 ret = generic_getxattr(dentry, name, data, size);
1881 gfs2_glock_dq(&gh);
1882 }
1883 gfs2_holder_uninit(&gh);
1884 return ret;
1885}
1886
1887static int gfs2_removexattr(struct dentry *dentry, const char *name)
1888{
1889 struct inode *inode = dentry->d_inode;
1890 struct gfs2_inode *ip = GFS2_I(inode);
1891 struct gfs2_holder gh;
1892 int ret;
1893
1894 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1895 ret = gfs2_glock_nq(&gh);
1896 if (ret == 0) {
1897 ret = generic_removexattr(dentry, name);
1898 gfs2_glock_dq(&gh);
1899 }
1900 gfs2_holder_uninit(&gh);
1901 return ret;
1902}
1903
1904static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1905 u64 start, u64 len)
1906{
1907 struct gfs2_inode *ip = GFS2_I(inode);
1908 struct gfs2_holder gh;
1909 int ret;
1910
1911 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1912 if (ret)
1913 return ret;
1914
1915 mutex_lock(&inode->i_mutex);
1916
1917 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1918 if (ret)
1919 goto out;
1920
1921 if (gfs2_is_stuffed(ip)) {
1922 u64 phys = ip->i_no_addr << inode->i_blkbits;
1923 u64 size = i_size_read(inode);
1924 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1925 FIEMAP_EXTENT_DATA_INLINE;
1926 phys += sizeof(struct gfs2_dinode);
1927 phys += start;
1928 if (start + len > size)
1929 len = size - start;
1930 if (start < size)
1931 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1932 len, flags);
1933 if (ret == 1)
1934 ret = 0;
1935 } else {
1936 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1937 gfs2_block_map);
1938 }
1939
1940 gfs2_glock_dq_uninit(&gh);
1941out:
1942 mutex_unlock(&inode->i_mutex);
1943 return ret;
1944}
1945
1946const struct inode_operations gfs2_file_iops = {
1947 .permission = gfs2_permission,
1948 .setattr = gfs2_setattr,
1949 .getattr = gfs2_getattr,
1950 .setxattr = gfs2_setxattr,
1951 .getxattr = gfs2_getxattr,
1952 .listxattr = gfs2_listxattr,
1953 .removexattr = gfs2_removexattr,
1954 .fiemap = gfs2_fiemap,
1955};
1956
1957const struct inode_operations gfs2_dir_iops = {
1958 .create = gfs2_create,
1959 .lookup = gfs2_lookup,
1960 .link = gfs2_link,
1961 .unlink = gfs2_unlink,
1962 .symlink = gfs2_symlink,
1963 .mkdir = gfs2_mkdir,
1964 .rmdir = gfs2_unlink,
1965 .mknod = gfs2_mknod,
1966 .rename = gfs2_rename,
1967 .permission = gfs2_permission,
1968 .setattr = gfs2_setattr,
1969 .getattr = gfs2_getattr,
1970 .setxattr = gfs2_setxattr,
1971 .getxattr = gfs2_getxattr,
1972 .listxattr = gfs2_listxattr,
1973 .removexattr = gfs2_removexattr,
1974 .fiemap = gfs2_fiemap,
1975};
1976
1977const struct inode_operations gfs2_symlink_iops = {
1978 .readlink = generic_readlink,
1979 .follow_link = gfs2_follow_link,
1980 .put_link = gfs2_put_link,
1981 .permission = gfs2_permission,
1982 .setattr = gfs2_setattr,
1983 .getattr = gfs2_getattr,
1984 .setxattr = gfs2_setxattr,
1985 .getxattr = gfs2_getxattr,
1986 .listxattr = gfs2_listxattr,
1987 .removexattr = gfs2_removexattr,
1988 .fiemap = gfs2_fiemap,
1989};
1990
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-22 20:14:30 -0500