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jfs: use generic posix ACL infrastructure
[deliverable/linux.git] / fs / gfs2 / inode.c
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1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2011 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_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 /* Must not read in block until block type is verified */
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 /* Two extra checks for NFS only */
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 /* gfs2_lookupi has inconsistent callers: vfs
257 * related routines expect NULL for no entry found,
258 * gfs2_lookup_simple callers expect ENOENT
259 * and do not check for NULL.
260 */
261 if (inode == NULL)
262 return ERR_PTR(-ENOENT);
263 else
264 return inode;
265}
266
267
268/**
269 * gfs2_lookupi - Look up a filename in a directory and return its inode
270 * @d_gh: An initialized holder for the directory glock
271 * @name: The name of the inode to look for
272 * @is_root: If 1, ignore the caller's permissions
273 * @i_gh: An uninitialized holder for the new inode glock
274 *
275 * This can be called via the VFS filldir function when NFS is doing
276 * a readdirplus and the inode which its intending to stat isn't
277 * already in cache. In this case we must not take the directory glock
278 * again, since the readdir call will have already taken that lock.
279 *
280 * Returns: errno
281 */
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 == sb->s_root->d_inode)) {
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}
326
327/**
328 * create_ok - OK to create a new on-disk inode here?
329 * @dip: Directory in which dinode is to be created
330 * @name: Name of new dinode
331 * @mode:
332 *
333 * Returns: errno
334 */
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 /* Don't create entries in an unlinked directory */
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)
380{
381 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
382 struct gfs2_alloc_parms ap = { .target = RES_DINODE, .aflags = flags, };
383 int error;
384 int dblocks = 1;
385
386 error = gfs2_quota_lock_check(ip);
387 if (error)
388 goto out;
389
390 error = gfs2_inplace_reserve(ip, &ap);
391 if (error)
392 goto out_quota;
393
394 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 0);
395 if (error)
396 goto out_ipreserv;
397
398 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, &dblocks, 1, &ip->i_generation);
399 ip->i_no_formal_ino = ip->i_generation;
400 ip->i_inode.i_ino = ip->i_no_addr;
401 ip->i_goal = ip->i_no_addr;
402
403 gfs2_trans_end(sdp);
404
405out_ipreserv:
406 gfs2_inplace_release(ip);
407out_quota:
408 gfs2_quota_unlock(ip);
409out:
410 return error;
411}
412
413static void gfs2_init_dir(struct buffer_head *dibh,
414 const struct gfs2_inode *parent)
415{
416 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
417 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
418
419 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
420 dent->de_inum = di->di_num; /* already GFS2 endian */
421 dent->de_type = cpu_to_be16(DT_DIR);
422
423 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
424 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
425 gfs2_inum_out(parent, dent);
426 dent->de_type = cpu_to_be16(DT_DIR);
427
428}
429
430/**
431 * init_dinode - Fill in a new dinode structure
432 * @dip: The directory this inode is being created in
433 * @ip: The inode
434 * @symname: The symlink destination (if a symlink)
435 * @bhp: The buffer head (returned to caller)
436 *
437 */
438
439static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
440 const char *symname)
441{
442 struct gfs2_dinode *di;
443 struct buffer_head *dibh;
444
445 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
446 gfs2_trans_add_meta(ip->i_gl, dibh);
447 di = (struct gfs2_dinode *)dibh->b_data;
448 gfs2_dinode_out(ip, di);
449
450 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
451 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
452 di->__pad1 = 0;
453 di->__pad2 = 0;
454 di->__pad3 = 0;
455 memset(&di->__pad4, 0, sizeof(di->__pad4));
456 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
457 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
458
459 switch(ip->i_inode.i_mode & S_IFMT) {
460 case S_IFDIR:
461 gfs2_init_dir(dibh, dip);
462 break;
463 case S_IFLNK:
464 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
465 break;
466 }
467
468 set_buffer_uptodate(dibh);
469 brelse(dibh);
470}
471
472static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
473 struct gfs2_inode *ip, int arq)
474{
475 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
476 struct gfs2_alloc_parms ap = { .target = sdp->sd_max_dirres, };
477 int error;
478
479 if (arq) {
480 error = gfs2_quota_lock_check(dip);
481 if (error)
482 goto fail_quota_locks;
483
484 error = gfs2_inplace_reserve(dip, &ap);
485 if (error)
486 goto fail_quota_locks;
487
488 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
489 dip->i_rgd->rd_length +
490 2 * RES_DINODE +
491 RES_STATFS + RES_QUOTA, 0);
492 if (error)
493 goto fail_ipreserv;
494 } else {
495 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
496 if (error)
497 goto fail_quota_locks;
498 }
499
500 error = gfs2_dir_add(&dip->i_inode, name, ip);
501 if (error)
502 goto fail_end_trans;
503
504fail_end_trans:
505 gfs2_trans_end(sdp);
506fail_ipreserv:
507 gfs2_inplace_release(dip);
508fail_quota_locks:
509 gfs2_quota_unlock(dip);
510 return error;
511}
512
513static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
514 void *fs_info)
515{
516 const struct xattr *xattr;
517 int err = 0;
518
519 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
520 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
521 xattr->value_len, 0,
522 GFS2_EATYPE_SECURITY);
523 if (err < 0)
524 break;
525 }
526 return err;
527}
528
529static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
530 const struct qstr *qstr)
531{
532 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
533 &gfs2_initxattrs, NULL);
534}
535
536/**
537 * gfs2_create_inode - Create a new inode
538 * @dir: The parent directory
539 * @dentry: The new dentry
540 * @file: If non-NULL, the file which is being opened
541 * @mode: The permissions on the new inode
542 * @dev: For device nodes, this is the device number
543 * @symname: For symlinks, this is the link destination
544 * @size: The initial size of the inode (ignored for directories)
545 *
546 * Returns: 0 on success, or error code
547 */
548
549static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
550 struct file *file,
551 umode_t mode, dev_t dev, const char *symname,
552 unsigned int size, int excl, int *opened)
553{
554 const struct qstr *name = &dentry->d_name;
555 struct gfs2_holder ghs[2];
556 struct inode *inode = NULL;
557 struct gfs2_inode *dip = GFS2_I(dir), *ip;
558 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
559 struct gfs2_glock *io_gl;
560 struct dentry *d;
561 int error;
562 u32 aflags = 0;
563 int arq;
564
565 if (!name->len || name->len > GFS2_FNAMESIZE)
566 return -ENAMETOOLONG;
567
568 error = gfs2_rs_alloc(dip);
569 if (error)
570 return error;
571
572 error = gfs2_rindex_update(sdp);
573 if (error)
574 return error;
575
576 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
577 if (error)
578 goto fail;
579
580 error = create_ok(dip, name, mode);
581 if (error)
582 goto fail_gunlock;
583
584 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
585 error = PTR_ERR(inode);
586 if (!IS_ERR(inode)) {
587 d = d_splice_alias(inode, dentry);
588 error = 0;
589 if (file) {
590 if (S_ISREG(inode->i_mode)) {
591 WARN_ON(d != NULL);
592 error = finish_open(file, dentry, gfs2_open_common, opened);
593 } else {
594 error = finish_no_open(file, d);
595 }
596 } else {
597 dput(d);
598 }
599 gfs2_glock_dq_uninit(ghs);
600 return error;
601 } else if (error != -ENOENT) {
602 goto fail_gunlock;
603 }
604
605 arq = error = gfs2_diradd_alloc_required(dir, name);
606 if (error < 0)
607 goto fail_gunlock;
608
609 inode = new_inode(sdp->sd_vfs);
610 error = -ENOMEM;
611 if (!inode)
612 goto fail_gunlock;
613
614 ip = GFS2_I(inode);
615 error = gfs2_rs_alloc(ip);
616 if (error)
617 goto fail_free_inode;
618
619 inode->i_mode = mode;
620 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
621 inode->i_rdev = dev;
622 inode->i_size = size;
623 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
624 gfs2_set_inode_blocks(inode, 1);
625 munge_mode_uid_gid(dip, inode);
626 ip->i_goal = dip->i_goal;
627 ip->i_diskflags = 0;
628 ip->i_eattr = 0;
629 ip->i_height = 0;
630 ip->i_depth = 0;
631 ip->i_entries = 0;
632
633 switch(mode & S_IFMT) {
634 case S_IFREG:
635 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
636 gfs2_tune_get(sdp, gt_new_files_jdata))
637 ip->i_diskflags |= GFS2_DIF_JDATA;
638 gfs2_set_aops(inode);
639 break;
640 case S_IFDIR:
641 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
642 ip->i_diskflags |= GFS2_DIF_JDATA;
643 ip->i_entries = 2;
644 break;
645 }
646 gfs2_set_inode_flags(inode);
647
648 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) ||
649 (dip->i_diskflags & GFS2_DIF_TOPDIR))
650 aflags |= GFS2_AF_ORLOV;
651
652 error = alloc_dinode(ip, aflags);
653 if (error)
654 goto fail_free_inode;
655
656 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
657 if (error)
658 goto fail_free_inode;
659
660 ip->i_gl->gl_object = ip;
661 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
662 if (error)
663 goto fail_free_inode;
664
665 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
666 if (error)
667 goto fail_gunlock2;
668
669 init_dinode(dip, ip, symname);
670 gfs2_trans_end(sdp);
671
672 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
673 if (error)
674 goto fail_gunlock2;
675
676 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
677 if (error)
678 goto fail_gunlock2;
679
680 ip->i_iopen_gh.gh_gl->gl_object = ip;
681 gfs2_glock_put(io_gl);
682 gfs2_set_iop(inode);
683 insert_inode_hash(inode);
684
685 error = gfs2_acl_create(dip, inode);
686 if (error)
687 goto fail_gunlock3;
688
689 error = gfs2_security_init(dip, ip, name);
690 if (error)
691 goto fail_gunlock3;
692
693 error = link_dinode(dip, name, ip, arq);
694 if (error)
695 goto fail_gunlock3;
696
697 mark_inode_dirty(inode);
698 d_instantiate(dentry, inode);
699 if (file) {
700 *opened |= FILE_CREATED;
701 error = finish_open(file, dentry, gfs2_open_common, opened);
702 }
703 gfs2_glock_dq_uninit(ghs);
704 gfs2_glock_dq_uninit(ghs + 1);
705 return error;
706
707fail_gunlock3:
708 gfs2_glock_dq_uninit(ghs + 1);
709 if (ip->i_gl)
710 gfs2_glock_put(ip->i_gl);
711 goto fail_gunlock;
712
713fail_gunlock2:
714 gfs2_glock_dq_uninit(ghs + 1);
715fail_free_inode:
716 if (ip->i_gl)
717 gfs2_glock_put(ip->i_gl);
718 gfs2_rs_delete(ip, NULL);
719 free_inode_nonrcu(inode);
720 inode = NULL;
721fail_gunlock:
722 gfs2_glock_dq_uninit(ghs);
723 if (inode && !IS_ERR(inode)) {
724 clear_nlink(inode);
725 mark_inode_dirty(inode);
726 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags);
727 iput(inode);
728 }
729fail:
730 return error;
731}
732
733/**
734 * gfs2_create - Create a file
735 * @dir: The directory in which to create the file
736 * @dentry: The dentry of the new file
737 * @mode: The mode of the new file
738 *
739 * Returns: errno
740 */
741
742static int gfs2_create(struct inode *dir, struct dentry *dentry,
743 umode_t mode, bool excl)
744{
745 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
746}
747
748/**
749 * __gfs2_lookup - Look up a filename in a directory and return its inode
750 * @dir: The directory inode
751 * @dentry: The dentry of the new inode
752 * @file: File to be opened
753 * @opened: atomic_open flags
754 *
755 *
756 * Returns: errno
757 */
758
759static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
760 struct file *file, int *opened)
761{
762 struct inode *inode;
763 struct dentry *d;
764 struct gfs2_holder gh;
765 struct gfs2_glock *gl;
766 int error;
767
768 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
769 if (!inode)
770 return NULL;
771 if (IS_ERR(inode))
772 return ERR_CAST(inode);
773
774 gl = GFS2_I(inode)->i_gl;
775 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
776 if (error) {
777 iput(inode);
778 return ERR_PTR(error);
779 }
780
781 d = d_splice_alias(inode, dentry);
782 if (file && S_ISREG(inode->i_mode))
783 error = finish_open(file, dentry, gfs2_open_common, opened);
784
785 gfs2_glock_dq_uninit(&gh);
786 if (error) {
787 dput(d);
788 return ERR_PTR(error);
789 }
790 return d;
791}
792
793static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
794 unsigned flags)
795{
796 return __gfs2_lookup(dir, dentry, NULL, NULL);
797}
798
799/**
800 * gfs2_link - Link to a file
801 * @old_dentry: The inode to link
802 * @dir: Add link to this directory
803 * @dentry: The name of the link
804 *
805 * Link the inode in "old_dentry" into the directory "dir" with the
806 * name in "dentry".
807 *
808 * Returns: errno
809 */
810
811static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
812 struct dentry *dentry)
813{
814 struct gfs2_inode *dip = GFS2_I(dir);
815 struct gfs2_sbd *sdp = GFS2_SB(dir);
816 struct inode *inode = old_dentry->d_inode;
817 struct gfs2_inode *ip = GFS2_I(inode);
818 struct gfs2_holder ghs[2];
819 struct buffer_head *dibh;
820 int alloc_required;
821 int error;
822
823 if (S_ISDIR(inode->i_mode))
824 return -EPERM;
825
826 error = gfs2_rs_alloc(dip);
827 if (error)
828 return error;
829
830 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
831 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
832
833 error = gfs2_glock_nq(ghs); /* parent */
834 if (error)
835 goto out_parent;
836
837 error = gfs2_glock_nq(ghs + 1); /* child */
838 if (error)
839 goto out_child;
840
841 error = -ENOENT;
842 if (inode->i_nlink == 0)
843 goto out_gunlock;
844
845 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
846 if (error)
847 goto out_gunlock;
848
849 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
850 switch (error) {
851 case -ENOENT:
852 break;
853 case 0:
854 error = -EEXIST;
855 default:
856 goto out_gunlock;
857 }
858
859 error = -EINVAL;
860 if (!dip->i_inode.i_nlink)
861 goto out_gunlock;
862 error = -EFBIG;
863 if (dip->i_entries == (u32)-1)
864 goto out_gunlock;
865 error = -EPERM;
866 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
867 goto out_gunlock;
868 error = -EINVAL;
869 if (!ip->i_inode.i_nlink)
870 goto out_gunlock;
871 error = -EMLINK;
872 if (ip->i_inode.i_nlink == (u32)-1)
873 goto out_gunlock;
874
875 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
876 if (error < 0)
877 goto out_gunlock;
878 error = 0;
879
880 if (alloc_required) {
881 struct gfs2_alloc_parms ap = { .target = sdp->sd_max_dirres, };
882 error = gfs2_quota_lock_check(dip);
883 if (error)
884 goto out_gunlock;
885
886 error = gfs2_inplace_reserve(dip, &ap);
887 if (error)
888 goto out_gunlock_q;
889
890 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
891 gfs2_rg_blocks(dip, sdp->sd_max_dirres) +
892 2 * RES_DINODE + RES_STATFS +
893 RES_QUOTA, 0);
894 if (error)
895 goto out_ipres;
896 } else {
897 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
898 if (error)
899 goto out_ipres;
900 }
901
902 error = gfs2_meta_inode_buffer(ip, &dibh);
903 if (error)
904 goto out_end_trans;
905
906 error = gfs2_dir_add(dir, &dentry->d_name, ip);
907 if (error)
908 goto out_brelse;
909
910 gfs2_trans_add_meta(ip->i_gl, dibh);
911 inc_nlink(&ip->i_inode);
912 ip->i_inode.i_ctime = CURRENT_TIME;
913 ihold(inode);
914 d_instantiate(dentry, inode);
915 mark_inode_dirty(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_gunlock:
928 gfs2_glock_dq(ghs + 1);
929out_child:
930 gfs2_glock_dq(ghs);
931out_parent:
932 gfs2_holder_uninit(ghs);
933 gfs2_holder_uninit(ghs + 1);
934 return error;
935}
936
937/*
938 * gfs2_unlink_ok - check to see that a inode is still in a directory
939 * @dip: the directory
940 * @name: the name of the file
941 * @ip: the inode
942 *
943 * Assumes that the lock on (at least) @dip is held.
944 *
945 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
946 */
947
948static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
949 const struct gfs2_inode *ip)
950{
951 int error;
952
953 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
954 return -EPERM;
955
956 if ((dip->i_inode.i_mode & S_ISVTX) &&
957 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
958 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
959 return -EPERM;
960
961 if (IS_APPEND(&dip->i_inode))
962 return -EPERM;
963
964 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
965 if (error)
966 return error;
967
968 error = gfs2_dir_check(&dip->i_inode, name, ip);
969 if (error)
970 return error;
971
972 return 0;
973}
974
975/**
976 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
977 * @dip: The parent directory
978 * @name: The name of the entry in the parent directory
979 * @inode: The inode to be removed
980 *
981 * Called with all the locks and in a transaction. This will only be
982 * called for a directory after it has been checked to ensure it is empty.
983 *
984 * Returns: 0 on success, or an error
985 */
986
987static int gfs2_unlink_inode(struct gfs2_inode *dip,
988 const struct dentry *dentry)
989{
990 struct inode *inode = dentry->d_inode;
991 struct gfs2_inode *ip = GFS2_I(inode);
992 int error;
993
994 error = gfs2_dir_del(dip, dentry);
995 if (error)
996 return error;
997
998 ip->i_entries = 0;
999 inode->i_ctime = CURRENT_TIME;
1000 if (S_ISDIR(inode->i_mode))
1001 clear_nlink(inode);
1002 else
1003 drop_nlink(inode);
1004 mark_inode_dirty(inode);
1005 if (inode->i_nlink == 0)
1006 gfs2_unlink_di(inode);
1007 return 0;
1008}
1009
1010
1011/**
1012 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1013 * @dir: The inode of the directory containing the inode to unlink
1014 * @dentry: The file itself
1015 *
1016 * This routine uses the type of the inode as a flag to figure out
1017 * whether this is an unlink or an rmdir.
1018 *
1019 * Returns: errno
1020 */
1021
1022static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1023{
1024 struct gfs2_inode *dip = GFS2_I(dir);
1025 struct gfs2_sbd *sdp = GFS2_SB(dir);
1026 struct inode *inode = dentry->d_inode;
1027 struct gfs2_inode *ip = GFS2_I(inode);
1028 struct gfs2_holder ghs[3];
1029 struct gfs2_rgrpd *rgd;
1030 int error;
1031
1032 error = gfs2_rindex_update(sdp);
1033 if (error)
1034 return error;
1035
1036 error = -EROFS;
1037
1038 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1039 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1040
1041 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1042 if (!rgd)
1043 goto out_inodes;
1044
1045 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1046
1047
1048 error = gfs2_glock_nq(ghs); /* parent */
1049 if (error)
1050 goto out_parent;
1051
1052 error = gfs2_glock_nq(ghs + 1); /* child */
1053 if (error)
1054 goto out_child;
1055
1056 error = -ENOENT;
1057 if (inode->i_nlink == 0)
1058 goto out_rgrp;
1059
1060 if (S_ISDIR(inode->i_mode)) {
1061 error = -ENOTEMPTY;
1062 if (ip->i_entries > 2 || inode->i_nlink > 2)
1063 goto out_rgrp;
1064 }
1065
1066 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1067 if (error)
1068 goto out_rgrp;
1069
1070 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1071 if (error)
1072 goto out_gunlock;
1073
1074 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1075 if (error)
1076 goto out_end_trans;
1077
1078 error = gfs2_unlink_inode(dip, dentry);
1079
1080out_end_trans:
1081 gfs2_trans_end(sdp);
1082out_gunlock:
1083 gfs2_glock_dq(ghs + 2);
1084out_rgrp:
1085 gfs2_glock_dq(ghs + 1);
1086out_child:
1087 gfs2_glock_dq(ghs);
1088out_parent:
1089 gfs2_holder_uninit(ghs + 2);
1090out_inodes:
1091 gfs2_holder_uninit(ghs + 1);
1092 gfs2_holder_uninit(ghs);
1093 return error;
1094}
1095
1096/**
1097 * gfs2_symlink - Create a symlink
1098 * @dir: The directory to create the symlink in
1099 * @dentry: The dentry to put the symlink in
1100 * @symname: The thing which the link points to
1101 *
1102 * Returns: errno
1103 */
1104
1105static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1106 const char *symname)
1107{
1108 struct gfs2_sbd *sdp = GFS2_SB(dir);
1109 unsigned int size;
1110
1111 size = strlen(symname);
1112 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1113 return -ENAMETOOLONG;
1114
1115 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1116}
1117
1118/**
1119 * gfs2_mkdir - Make a directory
1120 * @dir: The parent directory of the new one
1121 * @dentry: The dentry of the new directory
1122 * @mode: The mode of the new directory
1123 *
1124 * Returns: errno
1125 */
1126
1127static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1128{
1129 struct gfs2_sbd *sdp = GFS2_SB(dir);
1130 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1131 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1132}
1133
1134/**
1135 * gfs2_mknod - Make a special file
1136 * @dir: The directory in which the special file will reside
1137 * @dentry: The dentry of the special file
1138 * @mode: The mode of the special file
1139 * @dev: The device specification of the special file
1140 *
1141 */
1142
1143static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1144 dev_t dev)
1145{
1146 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1147}
1148
1149/**
1150 * gfs2_atomic_open - Atomically open a file
1151 * @dir: The directory
1152 * @dentry: The proposed new entry
1153 * @file: The proposed new struct file
1154 * @flags: open flags
1155 * @mode: File mode
1156 * @opened: Flag to say whether the file has been opened or not
1157 *
1158 * Returns: error code or 0 for success
1159 */
1160
1161static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1162 struct file *file, unsigned flags,
1163 umode_t mode, int *opened)
1164{
1165 struct dentry *d;
1166 bool excl = !!(flags & O_EXCL);
1167
1168 d = __gfs2_lookup(dir, dentry, file, opened);
1169 if (IS_ERR(d))
1170 return PTR_ERR(d);
1171 if (d != NULL)
1172 dentry = d;
1173 if (dentry->d_inode) {
1174 if (!(*opened & FILE_OPENED)) {
1175 if (d == NULL)
1176 dget(dentry);
1177 return finish_no_open(file, dentry);
1178 }
1179 dput(d);
1180 return 0;
1181 }
1182
1183 BUG_ON(d != NULL);
1184 if (!(flags & O_CREAT))
1185 return -ENOENT;
1186
1187 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1188}
1189
1190/*
1191 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1192 * @this: move this
1193 * @to: to here
1194 *
1195 * Follow @to back to the root and make sure we don't encounter @this
1196 * Assumes we already hold the rename lock.
1197 *
1198 * Returns: errno
1199 */
1200
1201static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1202{
1203 struct inode *dir = &to->i_inode;
1204 struct super_block *sb = dir->i_sb;
1205 struct inode *tmp;
1206 int error = 0;
1207
1208 igrab(dir);
1209
1210 for (;;) {
1211 if (dir == &this->i_inode) {
1212 error = -EINVAL;
1213 break;
1214 }
1215 if (dir == sb->s_root->d_inode) {
1216 error = 0;
1217 break;
1218 }
1219
1220 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1221 if (IS_ERR(tmp)) {
1222 error = PTR_ERR(tmp);
1223 break;
1224 }
1225
1226 iput(dir);
1227 dir = tmp;
1228 }
1229
1230 iput(dir);
1231
1232 return error;
1233}
1234
1235/**
1236 * gfs2_rename - Rename a file
1237 * @odir: Parent directory of old file name
1238 * @odentry: The old dentry of the file
1239 * @ndir: Parent directory of new file name
1240 * @ndentry: The new dentry of the file
1241 *
1242 * Returns: errno
1243 */
1244
1245static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1246 struct inode *ndir, struct dentry *ndentry)
1247{
1248 struct gfs2_inode *odip = GFS2_I(odir);
1249 struct gfs2_inode *ndip = GFS2_I(ndir);
1250 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1251 struct gfs2_inode *nip = NULL;
1252 struct gfs2_sbd *sdp = GFS2_SB(odir);
1253 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1254 struct gfs2_rgrpd *nrgd;
1255 unsigned int num_gh;
1256 int dir_rename = 0;
1257 int alloc_required = 0;
1258 unsigned int x;
1259 int error;
1260
1261 if (ndentry->d_inode) {
1262 nip = GFS2_I(ndentry->d_inode);
1263 if (ip == nip)
1264 return 0;
1265 }
1266
1267 error = gfs2_rindex_update(sdp);
1268 if (error)
1269 return error;
1270
1271 error = gfs2_rs_alloc(ndip);
1272 if (error)
1273 return error;
1274
1275 if (odip != ndip) {
1276 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1277 0, &r_gh);
1278 if (error)
1279 goto out;
1280
1281 if (S_ISDIR(ip->i_inode.i_mode)) {
1282 dir_rename = 1;
1283 /* don't move a dirctory into it's subdir */
1284 error = gfs2_ok_to_move(ip, ndip);
1285 if (error)
1286 goto out_gunlock_r;
1287 }
1288 }
1289
1290 num_gh = 1;
1291 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1292 if (odip != ndip) {
1293 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1294 num_gh++;
1295 }
1296 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1297 num_gh++;
1298
1299 if (nip) {
1300 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1301 num_gh++;
1302 /* grab the resource lock for unlink flag twiddling
1303 * this is the case of the target file already existing
1304 * so we unlink before doing the rename
1305 */
1306 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1307 if (nrgd)
1308 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1309 }
1310
1311 for (x = 0; x < num_gh; x++) {
1312 error = gfs2_glock_nq(ghs + x);
1313 if (error)
1314 goto out_gunlock;
1315 }
1316
1317 error = -ENOENT;
1318 if (ip->i_inode.i_nlink == 0)
1319 goto out_gunlock;
1320
1321 /* Check out the old directory */
1322
1323 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1324 if (error)
1325 goto out_gunlock;
1326
1327 /* Check out the new directory */
1328
1329 if (nip) {
1330 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1331 if (error)
1332 goto out_gunlock;
1333
1334 if (nip->i_inode.i_nlink == 0) {
1335 error = -EAGAIN;
1336 goto out_gunlock;
1337 }
1338
1339 if (S_ISDIR(nip->i_inode.i_mode)) {
1340 if (nip->i_entries < 2) {
1341 gfs2_consist_inode(nip);
1342 error = -EIO;
1343 goto out_gunlock;
1344 }
1345 if (nip->i_entries > 2) {
1346 error = -ENOTEMPTY;
1347 goto out_gunlock;
1348 }
1349 }
1350 } else {
1351 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1352 if (error)
1353 goto out_gunlock;
1354
1355 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1356 switch (error) {
1357 case -ENOENT:
1358 error = 0;
1359 break;
1360 case 0:
1361 error = -EEXIST;
1362 default:
1363 goto out_gunlock;
1364 };
1365
1366 if (odip != ndip) {
1367 if (!ndip->i_inode.i_nlink) {
1368 error = -ENOENT;
1369 goto out_gunlock;
1370 }
1371 if (ndip->i_entries == (u32)-1) {
1372 error = -EFBIG;
1373 goto out_gunlock;
1374 }
1375 if (S_ISDIR(ip->i_inode.i_mode) &&
1376 ndip->i_inode.i_nlink == (u32)-1) {
1377 error = -EMLINK;
1378 goto out_gunlock;
1379 }
1380 }
1381 }
1382
1383 /* Check out the dir to be renamed */
1384
1385 if (dir_rename) {
1386 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1387 if (error)
1388 goto out_gunlock;
1389 }
1390
1391 if (nip == NULL)
1392 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1393 error = alloc_required;
1394 if (error < 0)
1395 goto out_gunlock;
1396
1397 if (alloc_required) {
1398 struct gfs2_alloc_parms ap = { .target = sdp->sd_max_dirres, };
1399 error = gfs2_quota_lock_check(ndip);
1400 if (error)
1401 goto out_gunlock;
1402
1403 error = gfs2_inplace_reserve(ndip, &ap);
1404 if (error)
1405 goto out_gunlock_q;
1406
1407 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1408 gfs2_rg_blocks(ndip, sdp->sd_max_dirres) +
1409 4 * RES_DINODE + 4 * RES_LEAF +
1410 RES_STATFS + RES_QUOTA + 4, 0);
1411 if (error)
1412 goto out_ipreserv;
1413 } else {
1414 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1415 5 * RES_LEAF + 4, 0);
1416 if (error)
1417 goto out_gunlock;
1418 }
1419
1420 /* Remove the target file, if it exists */
1421
1422 if (nip)
1423 error = gfs2_unlink_inode(ndip, ndentry);
1424
1425 if (dir_rename) {
1426 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1427 if (error)
1428 goto out_end_trans;
1429 } else {
1430 struct buffer_head *dibh;
1431 error = gfs2_meta_inode_buffer(ip, &dibh);
1432 if (error)
1433 goto out_end_trans;
1434 ip->i_inode.i_ctime = CURRENT_TIME;
1435 gfs2_trans_add_meta(ip->i_gl, dibh);
1436 gfs2_dinode_out(ip, dibh->b_data);
1437 brelse(dibh);
1438 }
1439
1440 error = gfs2_dir_del(odip, odentry);
1441 if (error)
1442 goto out_end_trans;
1443
1444 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1445 if (error)
1446 goto out_end_trans;
1447
1448out_end_trans:
1449 gfs2_trans_end(sdp);
1450out_ipreserv:
1451 if (alloc_required)
1452 gfs2_inplace_release(ndip);
1453out_gunlock_q:
1454 if (alloc_required)
1455 gfs2_quota_unlock(ndip);
1456out_gunlock:
1457 while (x--) {
1458 gfs2_glock_dq(ghs + x);
1459 gfs2_holder_uninit(ghs + x);
1460 }
1461out_gunlock_r:
1462 if (r_gh.gh_gl)
1463 gfs2_glock_dq_uninit(&r_gh);
1464out:
1465 return error;
1466}
1467
1468/**
1469 * gfs2_follow_link - Follow a symbolic link
1470 * @dentry: The dentry of the link
1471 * @nd: Data that we pass to vfs_follow_link()
1472 *
1473 * This can handle symlinks of any size.
1474 *
1475 * Returns: 0 on success or error code
1476 */
1477
1478static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1479{
1480 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1481 struct gfs2_holder i_gh;
1482 struct buffer_head *dibh;
1483 unsigned int size;
1484 char *buf;
1485 int error;
1486
1487 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1488 error = gfs2_glock_nq(&i_gh);
1489 if (error) {
1490 gfs2_holder_uninit(&i_gh);
1491 nd_set_link(nd, ERR_PTR(error));
1492 return NULL;
1493 }
1494
1495 size = (unsigned int)i_size_read(&ip->i_inode);
1496 if (size == 0) {
1497 gfs2_consist_inode(ip);
1498 buf = ERR_PTR(-EIO);
1499 goto out;
1500 }
1501
1502 error = gfs2_meta_inode_buffer(ip, &dibh);
1503 if (error) {
1504 buf = ERR_PTR(error);
1505 goto out;
1506 }
1507
1508 buf = kzalloc(size + 1, GFP_NOFS);
1509 if (!buf)
1510 buf = ERR_PTR(-ENOMEM);
1511 else
1512 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1513 brelse(dibh);
1514out:
1515 gfs2_glock_dq_uninit(&i_gh);
1516 nd_set_link(nd, buf);
1517 return NULL;
1518}
1519
1520/**
1521 * gfs2_permission -
1522 * @inode: The inode
1523 * @mask: The mask to be tested
1524 * @flags: Indicates whether this is an RCU path walk or not
1525 *
1526 * This may be called from the VFS directly, or from within GFS2 with the
1527 * inode locked, so we look to see if the glock is already locked and only
1528 * lock the glock if its not already been done.
1529 *
1530 * Returns: errno
1531 */
1532
1533int gfs2_permission(struct inode *inode, int mask)
1534{
1535 struct gfs2_inode *ip;
1536 struct gfs2_holder i_gh;
1537 int error;
1538 int unlock = 0;
1539
1540
1541 ip = GFS2_I(inode);
1542 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1543 if (mask & MAY_NOT_BLOCK)
1544 return -ECHILD;
1545 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1546 if (error)
1547 return error;
1548 unlock = 1;
1549 }
1550
1551 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1552 error = -EACCES;
1553 else
1554 error = generic_permission(inode, mask);
1555 if (unlock)
1556 gfs2_glock_dq_uninit(&i_gh);
1557
1558 return error;
1559}
1560
1561static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1562{
1563 setattr_copy(inode, attr);
1564 mark_inode_dirty(inode);
1565 return 0;
1566}
1567
1568/**
1569 * gfs2_setattr_simple -
1570 * @ip:
1571 * @attr:
1572 *
1573 * Returns: errno
1574 */
1575
1576int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1577{
1578 int error;
1579
1580 if (current->journal_info)
1581 return __gfs2_setattr_simple(inode, attr);
1582
1583 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1584 if (error)
1585 return error;
1586
1587 error = __gfs2_setattr_simple(inode, attr);
1588 gfs2_trans_end(GFS2_SB(inode));
1589 return error;
1590}
1591
1592static int setattr_chown(struct inode *inode, struct iattr *attr)
1593{
1594 struct gfs2_inode *ip = GFS2_I(inode);
1595 struct gfs2_sbd *sdp = GFS2_SB(inode);
1596 kuid_t ouid, nuid;
1597 kgid_t ogid, ngid;
1598 int error;
1599
1600 ouid = inode->i_uid;
1601 ogid = inode->i_gid;
1602 nuid = attr->ia_uid;
1603 ngid = attr->ia_gid;
1604
1605 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1606 ouid = nuid = NO_UID_QUOTA_CHANGE;
1607 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1608 ogid = ngid = NO_GID_QUOTA_CHANGE;
1609
1610 error = gfs2_quota_lock(ip, nuid, ngid);
1611 if (error)
1612 return error;
1613
1614 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1615 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1616 error = gfs2_quota_check(ip, nuid, ngid);
1617 if (error)
1618 goto out_gunlock_q;
1619 }
1620
1621 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1622 if (error)
1623 goto out_gunlock_q;
1624
1625 error = gfs2_setattr_simple(inode, attr);
1626 if (error)
1627 goto out_end_trans;
1628
1629 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1630 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1631 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1632 gfs2_quota_change(ip, -blocks, ouid, ogid);
1633 gfs2_quota_change(ip, blocks, nuid, ngid);
1634 }
1635
1636out_end_trans:
1637 gfs2_trans_end(sdp);
1638out_gunlock_q:
1639 gfs2_quota_unlock(ip);
1640 return error;
1641}
1642
1643/**
1644 * gfs2_setattr - Change attributes on an inode
1645 * @dentry: The dentry which is changing
1646 * @attr: The structure describing the change
1647 *
1648 * The VFS layer wants to change one or more of an inodes attributes. Write
1649 * that change out to disk.
1650 *
1651 * Returns: errno
1652 */
1653
1654static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1655{
1656 struct inode *inode = dentry->d_inode;
1657 struct gfs2_inode *ip = GFS2_I(inode);
1658 struct gfs2_holder i_gh;
1659 int error;
1660
1661 error = gfs2_rs_alloc(ip);
1662 if (error)
1663 return error;
1664
1665 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1666 if (error)
1667 return error;
1668
1669 error = -EPERM;
1670 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1671 goto out;
1672
1673 error = inode_change_ok(inode, attr);
1674 if (error)
1675 goto out;
1676
1677 if (attr->ia_valid & ATTR_SIZE)
1678 error = gfs2_setattr_size(inode, attr->ia_size);
1679 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1680 error = setattr_chown(inode, attr);
1681 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1682 error = gfs2_acl_chmod(ip, attr);
1683 else
1684 error = gfs2_setattr_simple(inode, attr);
1685
1686out:
1687 if (!error)
1688 mark_inode_dirty(inode);
1689 gfs2_glock_dq_uninit(&i_gh);
1690 return error;
1691}
1692
1693/**
1694 * gfs2_getattr - Read out an inode's attributes
1695 * @mnt: The vfsmount the inode is being accessed from
1696 * @dentry: The dentry to stat
1697 * @stat: The inode's stats
1698 *
1699 * This may be called from the VFS directly, or from within GFS2 with the
1700 * inode locked, so we look to see if the glock is already locked and only
1701 * lock the glock if its not already been done. Note that its the NFS
1702 * readdirplus operation which causes this to be called (from filldir)
1703 * with the glock already held.
1704 *
1705 * Returns: errno
1706 */
1707
1708static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1709 struct kstat *stat)
1710{
1711 struct inode *inode = dentry->d_inode;
1712 struct gfs2_inode *ip = GFS2_I(inode);
1713 struct gfs2_holder gh;
1714 int error;
1715 int unlock = 0;
1716
1717 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1718 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1719 if (error)
1720 return error;
1721 unlock = 1;
1722 }
1723
1724 generic_fillattr(inode, stat);
1725 if (unlock)
1726 gfs2_glock_dq_uninit(&gh);
1727
1728 return 0;
1729}
1730
1731static int gfs2_setxattr(struct dentry *dentry, const char *name,
1732 const void *data, size_t size, int flags)
1733{
1734 struct inode *inode = dentry->d_inode;
1735 struct gfs2_inode *ip = GFS2_I(inode);
1736 struct gfs2_holder gh;
1737 int ret;
1738
1739 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1740 ret = gfs2_glock_nq(&gh);
1741 if (ret == 0) {
1742 ret = gfs2_rs_alloc(ip);
1743 if (ret == 0)
1744 ret = generic_setxattr(dentry, name, data, size, flags);
1745 gfs2_glock_dq(&gh);
1746 }
1747 gfs2_holder_uninit(&gh);
1748 return ret;
1749}
1750
1751static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1752 void *data, size_t size)
1753{
1754 struct inode *inode = dentry->d_inode;
1755 struct gfs2_inode *ip = GFS2_I(inode);
1756 struct gfs2_holder gh;
1757 int ret;
1758
1759 /* For selinux during lookup */
1760 if (gfs2_glock_is_locked_by_me(ip->i_gl))
1761 return generic_getxattr(dentry, name, data, size);
1762
1763 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1764 ret = gfs2_glock_nq(&gh);
1765 if (ret == 0) {
1766 ret = generic_getxattr(dentry, name, data, size);
1767 gfs2_glock_dq(&gh);
1768 }
1769 gfs2_holder_uninit(&gh);
1770 return ret;
1771}
1772
1773static int gfs2_removexattr(struct dentry *dentry, const char *name)
1774{
1775 struct inode *inode = dentry->d_inode;
1776 struct gfs2_inode *ip = GFS2_I(inode);
1777 struct gfs2_holder gh;
1778 int ret;
1779
1780 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1781 ret = gfs2_glock_nq(&gh);
1782 if (ret == 0) {
1783 ret = gfs2_rs_alloc(ip);
1784 if (ret == 0)
1785 ret = generic_removexattr(dentry, name);
1786 gfs2_glock_dq(&gh);
1787 }
1788 gfs2_holder_uninit(&gh);
1789 return ret;
1790}
1791
1792static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1793 u64 start, u64 len)
1794{
1795 struct gfs2_inode *ip = GFS2_I(inode);
1796 struct gfs2_holder gh;
1797 int ret;
1798
1799 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1800 if (ret)
1801 return ret;
1802
1803 mutex_lock(&inode->i_mutex);
1804
1805 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1806 if (ret)
1807 goto out;
1808
1809 if (gfs2_is_stuffed(ip)) {
1810 u64 phys = ip->i_no_addr << inode->i_blkbits;
1811 u64 size = i_size_read(inode);
1812 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1813 FIEMAP_EXTENT_DATA_INLINE;
1814 phys += sizeof(struct gfs2_dinode);
1815 phys += start;
1816 if (start + len > size)
1817 len = size - start;
1818 if (start < size)
1819 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1820 len, flags);
1821 if (ret == 1)
1822 ret = 0;
1823 } else {
1824 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1825 gfs2_block_map);
1826 }
1827
1828 gfs2_glock_dq_uninit(&gh);
1829out:
1830 mutex_unlock(&inode->i_mutex);
1831 return ret;
1832}
1833
1834const struct inode_operations gfs2_file_iops = {
1835 .permission = gfs2_permission,
1836 .setattr = gfs2_setattr,
1837 .getattr = gfs2_getattr,
1838 .setxattr = gfs2_setxattr,
1839 .getxattr = gfs2_getxattr,
1840 .listxattr = gfs2_listxattr,
1841 .removexattr = gfs2_removexattr,
1842 .fiemap = gfs2_fiemap,
1843 .get_acl = gfs2_get_acl,
1844};
1845
1846const struct inode_operations gfs2_dir_iops = {
1847 .create = gfs2_create,
1848 .lookup = gfs2_lookup,
1849 .link = gfs2_link,
1850 .unlink = gfs2_unlink,
1851 .symlink = gfs2_symlink,
1852 .mkdir = gfs2_mkdir,
1853 .rmdir = gfs2_unlink,
1854 .mknod = gfs2_mknod,
1855 .rename = gfs2_rename,
1856 .permission = gfs2_permission,
1857 .setattr = gfs2_setattr,
1858 .getattr = gfs2_getattr,
1859 .setxattr = gfs2_setxattr,
1860 .getxattr = gfs2_getxattr,
1861 .listxattr = gfs2_listxattr,
1862 .removexattr = gfs2_removexattr,
1863 .fiemap = gfs2_fiemap,
1864 .get_acl = gfs2_get_acl,
1865 .atomic_open = gfs2_atomic_open,
1866};
1867
1868const struct inode_operations gfs2_symlink_iops = {
1869 .readlink = generic_readlink,
1870 .follow_link = gfs2_follow_link,
1871 .put_link = kfree_put_link,
1872 .permission = gfs2_permission,
1873 .setattr = gfs2_setattr,
1874 .getattr = gfs2_getattr,
1875 .setxattr = gfs2_setxattr,
1876 .getxattr = gfs2_getxattr,
1877 .listxattr = gfs2_listxattr,
1878 .removexattr = gfs2_removexattr,
1879 .fiemap = gfs2_fiemap,
1880 .get_acl = gfs2_get_acl,
1881};
1882
Linux kernel - Deliverables
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