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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(-ENOMEM);
153
154 if (inode->i_state & I_NEW) {
155 struct gfs2_sbd *sdp = GFS2_SB(inode);
156 ip->i_no_formal_ino = no_formal_ino;
157
158 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
159 if (unlikely(error))
160 goto fail;
161 ip->i_gl->gl_object = ip;
162
163 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
164 if (unlikely(error))
165 goto fail_put;
166
167 set_bit(GIF_INVALID, &ip->i_flags);
168 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
169 if (unlikely(error))
170 goto fail_iopen;
171
172 ip->i_iopen_gh.gh_gl->gl_object = ip;
173 gfs2_glock_put(io_gl);
174 io_gl = NULL;
175
176 if (type == DT_UNKNOWN) {
177 /* 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, unsigned *dblocks)
380{
381 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
382 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
383 int error;
384
385 error = gfs2_quota_lock_check(ip);
386 if (error)
387 goto out;
388
389 error = gfs2_inplace_reserve(ip, &ap);
390 if (error)
391 goto out_quota;
392
393 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
394 if (error)
395 goto out_ipreserv;
396
397 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
398 ip->i_no_formal_ino = ip->i_generation;
399 ip->i_inode.i_ino = ip->i_no_addr;
400 ip->i_goal = ip->i_no_addr;
401
402 gfs2_trans_end(sdp);
403
404out_ipreserv:
405 gfs2_inplace_release(ip);
406out_quota:
407 gfs2_quota_unlock(ip);
408out:
409 return error;
410}
411
412static void gfs2_init_dir(struct buffer_head *dibh,
413 const struct gfs2_inode *parent)
414{
415 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
416 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
417
418 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
419 dent->de_inum = di->di_num; /* already GFS2 endian */
420 dent->de_type = cpu_to_be16(DT_DIR);
421
422 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
423 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
424 gfs2_inum_out(parent, dent);
425 dent->de_type = cpu_to_be16(DT_DIR);
426
427}
428
429/**
430 * gfs2_init_xattr - Initialise an xattr block for a new inode
431 * @ip: The inode in question
432 *
433 * This sets up an empty xattr block for a new inode, ready to
434 * take any ACLs, LSM xattrs, etc.
435 */
436
437static void gfs2_init_xattr(struct gfs2_inode *ip)
438{
439 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
440 struct buffer_head *bh;
441 struct gfs2_ea_header *ea;
442
443 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
444 gfs2_trans_add_meta(ip->i_gl, bh);
445 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
446 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
447
448 ea = GFS2_EA_BH2FIRST(bh);
449 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
450 ea->ea_type = GFS2_EATYPE_UNUSED;
451 ea->ea_flags = GFS2_EAFLAG_LAST;
452
453 brelse(bh);
454}
455
456/**
457 * init_dinode - Fill in a new dinode structure
458 * @dip: The directory this inode is being created in
459 * @ip: The inode
460 * @symname: The symlink destination (if a symlink)
461 * @bhp: The buffer head (returned to caller)
462 *
463 */
464
465static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
466 const char *symname)
467{
468 struct gfs2_dinode *di;
469 struct buffer_head *dibh;
470
471 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
472 gfs2_trans_add_meta(ip->i_gl, dibh);
473 di = (struct gfs2_dinode *)dibh->b_data;
474 gfs2_dinode_out(ip, di);
475
476 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
477 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
478 di->__pad1 = 0;
479 di->__pad2 = 0;
480 di->__pad3 = 0;
481 memset(&di->__pad4, 0, sizeof(di->__pad4));
482 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
483 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
484
485 switch(ip->i_inode.i_mode & S_IFMT) {
486 case S_IFDIR:
487 gfs2_init_dir(dibh, dip);
488 break;
489 case S_IFLNK:
490 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
491 break;
492 }
493
494 set_buffer_uptodate(dibh);
495 brelse(dibh);
496}
497
498/**
499 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
500 * @dip: The directory we are linking into
501 * @da: The dir add information
502 * @nr_inodes: The number of inodes involved
503 *
504 * This calculate the number of blocks we need to reserve in a
505 * transaction to link @nr_inodes into a directory. In most cases
506 * @nr_inodes will be 2 (the directory plus the inode being linked in)
507 * but in case of rename, 4 may be required.
508 *
509 * Returns: Number of blocks
510 */
511
512static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
513 const struct gfs2_diradd *da,
514 unsigned nr_inodes)
515{
516 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
517 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
518}
519
520static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
521 struct gfs2_inode *ip, struct gfs2_diradd *da)
522{
523 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
524 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
525 int error;
526
527 if (da->nr_blocks) {
528 error = gfs2_quota_lock_check(dip);
529 if (error)
530 goto fail_quota_locks;
531
532 error = gfs2_inplace_reserve(dip, &ap);
533 if (error)
534 goto fail_quota_locks;
535
536 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
537 if (error)
538 goto fail_ipreserv;
539 } else {
540 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
541 if (error)
542 goto fail_quota_locks;
543 }
544
545 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
546 if (error)
547 goto fail_end_trans;
548
549fail_end_trans:
550 gfs2_trans_end(sdp);
551fail_ipreserv:
552 gfs2_inplace_release(dip);
553fail_quota_locks:
554 gfs2_quota_unlock(dip);
555 return error;
556}
557
558static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
559 void *fs_info)
560{
561 const struct xattr *xattr;
562 int err = 0;
563
564 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
565 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
566 xattr->value_len, 0,
567 GFS2_EATYPE_SECURITY);
568 if (err < 0)
569 break;
570 }
571 return err;
572}
573
574/**
575 * gfs2_create_inode - Create a new inode
576 * @dir: The parent directory
577 * @dentry: The new dentry
578 * @file: If non-NULL, the file which is being opened
579 * @mode: The permissions on the new inode
580 * @dev: For device nodes, this is the device number
581 * @symname: For symlinks, this is the link destination
582 * @size: The initial size of the inode (ignored for directories)
583 *
584 * Returns: 0 on success, or error code
585 */
586
587static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
588 struct file *file,
589 umode_t mode, dev_t dev, const char *symname,
590 unsigned int size, int excl, int *opened)
591{
592 const struct qstr *name = &dentry->d_name;
593 struct posix_acl *default_acl, *acl;
594 struct gfs2_holder ghs[2];
595 struct inode *inode = NULL;
596 struct gfs2_inode *dip = GFS2_I(dir), *ip;
597 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
598 struct gfs2_glock *io_gl;
599 struct dentry *d;
600 int error, free_vfs_inode = 0;
601 u32 aflags = 0;
602 unsigned blocks = 1;
603 struct gfs2_diradd da = { .bh = NULL, };
604
605 if (!name->len || name->len > GFS2_FNAMESIZE)
606 return -ENAMETOOLONG;
607
608 error = gfs2_rs_alloc(dip);
609 if (error)
610 return error;
611
612 error = gfs2_rindex_update(sdp);
613 if (error)
614 return error;
615
616 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
617 if (error)
618 goto fail;
619
620 error = create_ok(dip, name, mode);
621 if (error)
622 goto fail_gunlock;
623
624 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
625 error = PTR_ERR(inode);
626 if (!IS_ERR(inode)) {
627 d = d_splice_alias(inode, dentry);
628 error = PTR_ERR(d);
629 if (IS_ERR(d))
630 goto fail_gunlock;
631 error = 0;
632 if (file) {
633 if (S_ISREG(inode->i_mode)) {
634 WARN_ON(d != NULL);
635 error = finish_open(file, dentry, gfs2_open_common, opened);
636 } else {
637 error = finish_no_open(file, d);
638 }
639 } else {
640 dput(d);
641 }
642 gfs2_glock_dq_uninit(ghs);
643 return error;
644 } else if (error != -ENOENT) {
645 goto fail_gunlock;
646 }
647
648 error = gfs2_diradd_alloc_required(dir, name, &da);
649 if (error < 0)
650 goto fail_gunlock;
651
652 inode = new_inode(sdp->sd_vfs);
653 error = -ENOMEM;
654 if (!inode)
655 goto fail_gunlock;
656
657 error = posix_acl_create(dir, &mode, &default_acl, &acl);
658 if (error)
659 goto fail_free_vfs_inode;
660
661 ip = GFS2_I(inode);
662 error = gfs2_rs_alloc(ip);
663 if (error)
664 goto fail_free_acls;
665
666 inode->i_mode = mode;
667 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
668 inode->i_rdev = dev;
669 inode->i_size = size;
670 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
671 gfs2_set_inode_blocks(inode, 1);
672 munge_mode_uid_gid(dip, inode);
673 ip->i_goal = dip->i_goal;
674 ip->i_diskflags = 0;
675 ip->i_eattr = 0;
676 ip->i_height = 0;
677 ip->i_depth = 0;
678 ip->i_entries = 0;
679
680 switch(mode & S_IFMT) {
681 case S_IFREG:
682 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
683 gfs2_tune_get(sdp, gt_new_files_jdata))
684 ip->i_diskflags |= GFS2_DIF_JDATA;
685 gfs2_set_aops(inode);
686 break;
687 case S_IFDIR:
688 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
689 ip->i_diskflags |= GFS2_DIF_JDATA;
690 ip->i_entries = 2;
691 break;
692 }
693 gfs2_set_inode_flags(inode);
694
695 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) ||
696 (dip->i_diskflags & GFS2_DIF_TOPDIR))
697 aflags |= GFS2_AF_ORLOV;
698
699 if (default_acl || acl)
700 blocks++;
701
702 error = alloc_dinode(ip, aflags, &blocks);
703 if (error)
704 goto fail_free_inode;
705
706 gfs2_set_inode_blocks(inode, blocks);
707
708 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
709 if (error)
710 goto fail_free_inode;
711
712 ip->i_gl->gl_object = ip;
713 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
714 if (error)
715 goto fail_free_inode;
716
717 error = gfs2_trans_begin(sdp, blocks, 0);
718 if (error)
719 goto fail_gunlock2;
720
721 if (blocks > 1) {
722 ip->i_eattr = ip->i_no_addr + 1;
723 gfs2_init_xattr(ip);
724 }
725 init_dinode(dip, ip, symname);
726 gfs2_trans_end(sdp);
727
728 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
729 if (error)
730 goto fail_gunlock2;
731
732 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
733 if (error)
734 goto fail_gunlock2;
735
736 ip->i_iopen_gh.gh_gl->gl_object = ip;
737 gfs2_glock_put(io_gl);
738 gfs2_set_iop(inode);
739 insert_inode_hash(inode);
740
741 if (default_acl) {
742 error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
743 posix_acl_release(default_acl);
744 }
745 if (acl) {
746 if (!error)
747 error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
748 posix_acl_release(acl);
749 }
750
751 if (error)
752 goto fail_gunlock3;
753
754 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
755 &gfs2_initxattrs, NULL);
756 if (error)
757 goto fail_gunlock3;
758
759 error = link_dinode(dip, name, ip, &da);
760 if (error)
761 goto fail_gunlock3;
762
763 mark_inode_dirty(inode);
764 d_instantiate(dentry, inode);
765 if (file) {
766 *opened |= FILE_CREATED;
767 error = finish_open(file, dentry, gfs2_open_common, opened);
768 }
769 gfs2_glock_dq_uninit(ghs);
770 gfs2_glock_dq_uninit(ghs + 1);
771 return error;
772
773fail_gunlock3:
774 gfs2_glock_dq_uninit(ghs + 1);
775 if (ip->i_gl)
776 gfs2_glock_put(ip->i_gl);
777 goto fail_gunlock;
778
779fail_gunlock2:
780 gfs2_glock_dq_uninit(ghs + 1);
781fail_free_inode:
782 if (ip->i_gl)
783 gfs2_glock_put(ip->i_gl);
784 gfs2_rs_delete(ip, NULL);
785fail_free_acls:
786 if (default_acl)
787 posix_acl_release(default_acl);
788 if (acl)
789 posix_acl_release(acl);
790fail_free_vfs_inode:
791 free_vfs_inode = 1;
792fail_gunlock:
793 gfs2_dir_no_add(&da);
794 gfs2_glock_dq_uninit(ghs);
795 if (inode && !IS_ERR(inode)) {
796 clear_nlink(inode);
797 if (!free_vfs_inode)
798 mark_inode_dirty(inode);
799 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
800 &GFS2_I(inode)->i_flags);
801 iput(inode);
802 }
803fail:
804 return error;
805}
806
807/**
808 * gfs2_create - Create a file
809 * @dir: The directory in which to create the file
810 * @dentry: The dentry of the new file
811 * @mode: The mode of the new file
812 *
813 * Returns: errno
814 */
815
816static int gfs2_create(struct inode *dir, struct dentry *dentry,
817 umode_t mode, bool excl)
818{
819 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
820}
821
822/**
823 * __gfs2_lookup - Look up a filename in a directory and return its inode
824 * @dir: The directory inode
825 * @dentry: The dentry of the new inode
826 * @file: File to be opened
827 * @opened: atomic_open flags
828 *
829 *
830 * Returns: errno
831 */
832
833static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
834 struct file *file, int *opened)
835{
836 struct inode *inode;
837 struct dentry *d;
838 struct gfs2_holder gh;
839 struct gfs2_glock *gl;
840 int error;
841
842 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
843 if (!inode)
844 return NULL;
845 if (IS_ERR(inode))
846 return ERR_CAST(inode);
847
848 gl = GFS2_I(inode)->i_gl;
849 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
850 if (error) {
851 iput(inode);
852 return ERR_PTR(error);
853 }
854
855 d = d_splice_alias(inode, dentry);
856 if (IS_ERR(d)) {
857 iput(inode);
858 gfs2_glock_dq_uninit(&gh);
859 return d;
860 }
861 if (file && S_ISREG(inode->i_mode))
862 error = finish_open(file, dentry, gfs2_open_common, opened);
863
864 gfs2_glock_dq_uninit(&gh);
865 if (error) {
866 dput(d);
867 return ERR_PTR(error);
868 }
869 return d;
870}
871
872static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
873 unsigned flags)
874{
875 return __gfs2_lookup(dir, dentry, NULL, NULL);
876}
877
878/**
879 * gfs2_link - Link to a file
880 * @old_dentry: The inode to link
881 * @dir: Add link to this directory
882 * @dentry: The name of the link
883 *
884 * Link the inode in "old_dentry" into the directory "dir" with the
885 * name in "dentry".
886 *
887 * Returns: errno
888 */
889
890static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
891 struct dentry *dentry)
892{
893 struct gfs2_inode *dip = GFS2_I(dir);
894 struct gfs2_sbd *sdp = GFS2_SB(dir);
895 struct inode *inode = old_dentry->d_inode;
896 struct gfs2_inode *ip = GFS2_I(inode);
897 struct gfs2_holder ghs[2];
898 struct buffer_head *dibh;
899 struct gfs2_diradd da = { .bh = NULL, };
900 int error;
901
902 if (S_ISDIR(inode->i_mode))
903 return -EPERM;
904
905 error = gfs2_rs_alloc(dip);
906 if (error)
907 return error;
908
909 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
910 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
911
912 error = gfs2_glock_nq(ghs); /* parent */
913 if (error)
914 goto out_parent;
915
916 error = gfs2_glock_nq(ghs + 1); /* child */
917 if (error)
918 goto out_child;
919
920 error = -ENOENT;
921 if (inode->i_nlink == 0)
922 goto out_gunlock;
923
924 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
925 if (error)
926 goto out_gunlock;
927
928 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
929 switch (error) {
930 case -ENOENT:
931 break;
932 case 0:
933 error = -EEXIST;
934 default:
935 goto out_gunlock;
936 }
937
938 error = -EINVAL;
939 if (!dip->i_inode.i_nlink)
940 goto out_gunlock;
941 error = -EFBIG;
942 if (dip->i_entries == (u32)-1)
943 goto out_gunlock;
944 error = -EPERM;
945 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
946 goto out_gunlock;
947 error = -EINVAL;
948 if (!ip->i_inode.i_nlink)
949 goto out_gunlock;
950 error = -EMLINK;
951 if (ip->i_inode.i_nlink == (u32)-1)
952 goto out_gunlock;
953
954 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
955 if (error < 0)
956 goto out_gunlock;
957
958 if (da.nr_blocks) {
959 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
960 error = gfs2_quota_lock_check(dip);
961 if (error)
962 goto out_gunlock;
963
964 error = gfs2_inplace_reserve(dip, &ap);
965 if (error)
966 goto out_gunlock_q;
967
968 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
969 if (error)
970 goto out_ipres;
971 } else {
972 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
973 if (error)
974 goto out_ipres;
975 }
976
977 error = gfs2_meta_inode_buffer(ip, &dibh);
978 if (error)
979 goto out_end_trans;
980
981 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
982 if (error)
983 goto out_brelse;
984
985 gfs2_trans_add_meta(ip->i_gl, dibh);
986 inc_nlink(&ip->i_inode);
987 ip->i_inode.i_ctime = CURRENT_TIME;
988 ihold(inode);
989 d_instantiate(dentry, inode);
990 mark_inode_dirty(inode);
991
992out_brelse:
993 brelse(dibh);
994out_end_trans:
995 gfs2_trans_end(sdp);
996out_ipres:
997 if (da.nr_blocks)
998 gfs2_inplace_release(dip);
999out_gunlock_q:
1000 if (da.nr_blocks)
1001 gfs2_quota_unlock(dip);
1002out_gunlock:
1003 gfs2_dir_no_add(&da);
1004 gfs2_glock_dq(ghs + 1);
1005out_child:
1006 gfs2_glock_dq(ghs);
1007out_parent:
1008 gfs2_holder_uninit(ghs);
1009 gfs2_holder_uninit(ghs + 1);
1010 return error;
1011}
1012
1013/*
1014 * gfs2_unlink_ok - check to see that a inode is still in a directory
1015 * @dip: the directory
1016 * @name: the name of the file
1017 * @ip: the inode
1018 *
1019 * Assumes that the lock on (at least) @dip is held.
1020 *
1021 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1022 */
1023
1024static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1025 const struct gfs2_inode *ip)
1026{
1027 int error;
1028
1029 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1030 return -EPERM;
1031
1032 if ((dip->i_inode.i_mode & S_ISVTX) &&
1033 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1034 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1035 return -EPERM;
1036
1037 if (IS_APPEND(&dip->i_inode))
1038 return -EPERM;
1039
1040 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1041 if (error)
1042 return error;
1043
1044 error = gfs2_dir_check(&dip->i_inode, name, ip);
1045 if (error)
1046 return error;
1047
1048 return 0;
1049}
1050
1051/**
1052 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1053 * @dip: The parent directory
1054 * @name: The name of the entry in the parent directory
1055 * @inode: The inode to be removed
1056 *
1057 * Called with all the locks and in a transaction. This will only be
1058 * called for a directory after it has been checked to ensure it is empty.
1059 *
1060 * Returns: 0 on success, or an error
1061 */
1062
1063static int gfs2_unlink_inode(struct gfs2_inode *dip,
1064 const struct dentry *dentry)
1065{
1066 struct inode *inode = dentry->d_inode;
1067 struct gfs2_inode *ip = GFS2_I(inode);
1068 int error;
1069
1070 error = gfs2_dir_del(dip, dentry);
1071 if (error)
1072 return error;
1073
1074 ip->i_entries = 0;
1075 inode->i_ctime = CURRENT_TIME;
1076 if (S_ISDIR(inode->i_mode))
1077 clear_nlink(inode);
1078 else
1079 drop_nlink(inode);
1080 mark_inode_dirty(inode);
1081 if (inode->i_nlink == 0)
1082 gfs2_unlink_di(inode);
1083 return 0;
1084}
1085
1086
1087/**
1088 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1089 * @dir: The inode of the directory containing the inode to unlink
1090 * @dentry: The file itself
1091 *
1092 * This routine uses the type of the inode as a flag to figure out
1093 * whether this is an unlink or an rmdir.
1094 *
1095 * Returns: errno
1096 */
1097
1098static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1099{
1100 struct gfs2_inode *dip = GFS2_I(dir);
1101 struct gfs2_sbd *sdp = GFS2_SB(dir);
1102 struct inode *inode = dentry->d_inode;
1103 struct gfs2_inode *ip = GFS2_I(inode);
1104 struct gfs2_holder ghs[3];
1105 struct gfs2_rgrpd *rgd;
1106 int error;
1107
1108 error = gfs2_rindex_update(sdp);
1109 if (error)
1110 return error;
1111
1112 error = -EROFS;
1113
1114 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1115 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1116
1117 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1118 if (!rgd)
1119 goto out_inodes;
1120
1121 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1122
1123
1124 error = gfs2_glock_nq(ghs); /* parent */
1125 if (error)
1126 goto out_parent;
1127
1128 error = gfs2_glock_nq(ghs + 1); /* child */
1129 if (error)
1130 goto out_child;
1131
1132 error = -ENOENT;
1133 if (inode->i_nlink == 0)
1134 goto out_rgrp;
1135
1136 if (S_ISDIR(inode->i_mode)) {
1137 error = -ENOTEMPTY;
1138 if (ip->i_entries > 2 || inode->i_nlink > 2)
1139 goto out_rgrp;
1140 }
1141
1142 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1143 if (error)
1144 goto out_rgrp;
1145
1146 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1147 if (error)
1148 goto out_gunlock;
1149
1150 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1151 if (error)
1152 goto out_end_trans;
1153
1154 error = gfs2_unlink_inode(dip, dentry);
1155
1156out_end_trans:
1157 gfs2_trans_end(sdp);
1158out_gunlock:
1159 gfs2_glock_dq(ghs + 2);
1160out_rgrp:
1161 gfs2_glock_dq(ghs + 1);
1162out_child:
1163 gfs2_glock_dq(ghs);
1164out_parent:
1165 gfs2_holder_uninit(ghs + 2);
1166out_inodes:
1167 gfs2_holder_uninit(ghs + 1);
1168 gfs2_holder_uninit(ghs);
1169 return error;
1170}
1171
1172/**
1173 * gfs2_symlink - Create a symlink
1174 * @dir: The directory to create the symlink in
1175 * @dentry: The dentry to put the symlink in
1176 * @symname: The thing which the link points to
1177 *
1178 * Returns: errno
1179 */
1180
1181static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1182 const char *symname)
1183{
1184 struct gfs2_sbd *sdp = GFS2_SB(dir);
1185 unsigned int size;
1186
1187 size = strlen(symname);
1188 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1189 return -ENAMETOOLONG;
1190
1191 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1192}
1193
1194/**
1195 * gfs2_mkdir - Make a directory
1196 * @dir: The parent directory of the new one
1197 * @dentry: The dentry of the new directory
1198 * @mode: The mode of the new directory
1199 *
1200 * Returns: errno
1201 */
1202
1203static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1204{
1205 struct gfs2_sbd *sdp = GFS2_SB(dir);
1206 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1207 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1208}
1209
1210/**
1211 * gfs2_mknod - Make a special file
1212 * @dir: The directory in which the special file will reside
1213 * @dentry: The dentry of the special file
1214 * @mode: The mode of the special file
1215 * @dev: The device specification of the special file
1216 *
1217 */
1218
1219static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1220 dev_t dev)
1221{
1222 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1223}
1224
1225/**
1226 * gfs2_atomic_open - Atomically open a file
1227 * @dir: The directory
1228 * @dentry: The proposed new entry
1229 * @file: The proposed new struct file
1230 * @flags: open flags
1231 * @mode: File mode
1232 * @opened: Flag to say whether the file has been opened or not
1233 *
1234 * Returns: error code or 0 for success
1235 */
1236
1237static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1238 struct file *file, unsigned flags,
1239 umode_t mode, int *opened)
1240{
1241 struct dentry *d;
1242 bool excl = !!(flags & O_EXCL);
1243
1244 d = __gfs2_lookup(dir, dentry, file, opened);
1245 if (IS_ERR(d))
1246 return PTR_ERR(d);
1247 if (d != NULL)
1248 dentry = d;
1249 if (dentry->d_inode) {
1250 if (!(*opened & FILE_OPENED)) {
1251 if (d == NULL)
1252 dget(dentry);
1253 return finish_no_open(file, dentry);
1254 }
1255 dput(d);
1256 return 0;
1257 }
1258
1259 BUG_ON(d != NULL);
1260 if (!(flags & O_CREAT))
1261 return -ENOENT;
1262
1263 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1264}
1265
1266/*
1267 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1268 * @this: move this
1269 * @to: to here
1270 *
1271 * Follow @to back to the root and make sure we don't encounter @this
1272 * Assumes we already hold the rename lock.
1273 *
1274 * Returns: errno
1275 */
1276
1277static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1278{
1279 struct inode *dir = &to->i_inode;
1280 struct super_block *sb = dir->i_sb;
1281 struct inode *tmp;
1282 int error = 0;
1283
1284 igrab(dir);
1285
1286 for (;;) {
1287 if (dir == &this->i_inode) {
1288 error = -EINVAL;
1289 break;
1290 }
1291 if (dir == sb->s_root->d_inode) {
1292 error = 0;
1293 break;
1294 }
1295
1296 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1297 if (!tmp) {
1298 error = -ENOENT;
1299 break;
1300 }
1301 if (IS_ERR(tmp)) {
1302 error = PTR_ERR(tmp);
1303 break;
1304 }
1305
1306 iput(dir);
1307 dir = tmp;
1308 }
1309
1310 iput(dir);
1311
1312 return error;
1313}
1314
1315/**
1316 * gfs2_rename - Rename a file
1317 * @odir: Parent directory of old file name
1318 * @odentry: The old dentry of the file
1319 * @ndir: Parent directory of new file name
1320 * @ndentry: The new dentry of the file
1321 *
1322 * Returns: errno
1323 */
1324
1325static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1326 struct inode *ndir, struct dentry *ndentry)
1327{
1328 struct gfs2_inode *odip = GFS2_I(odir);
1329 struct gfs2_inode *ndip = GFS2_I(ndir);
1330 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1331 struct gfs2_inode *nip = NULL;
1332 struct gfs2_sbd *sdp = GFS2_SB(odir);
1333 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1334 struct gfs2_rgrpd *nrgd;
1335 unsigned int num_gh;
1336 int dir_rename = 0;
1337 struct gfs2_diradd da = { .nr_blocks = 0, };
1338 unsigned int x;
1339 int error;
1340
1341 if (ndentry->d_inode) {
1342 nip = GFS2_I(ndentry->d_inode);
1343 if (ip == nip)
1344 return 0;
1345 }
1346
1347 error = gfs2_rindex_update(sdp);
1348 if (error)
1349 return error;
1350
1351 error = gfs2_rs_alloc(ndip);
1352 if (error)
1353 return error;
1354
1355 if (odip != ndip) {
1356 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1357 0, &r_gh);
1358 if (error)
1359 goto out;
1360
1361 if (S_ISDIR(ip->i_inode.i_mode)) {
1362 dir_rename = 1;
1363 /* don't move a dirctory into it's subdir */
1364 error = gfs2_ok_to_move(ip, ndip);
1365 if (error)
1366 goto out_gunlock_r;
1367 }
1368 }
1369
1370 num_gh = 1;
1371 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1372 if (odip != ndip) {
1373 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1374 num_gh++;
1375 }
1376 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1377 num_gh++;
1378
1379 if (nip) {
1380 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1381 num_gh++;
1382 /* grab the resource lock for unlink flag twiddling
1383 * this is the case of the target file already existing
1384 * so we unlink before doing the rename
1385 */
1386 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1387 if (nrgd)
1388 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1389 }
1390
1391 for (x = 0; x < num_gh; x++) {
1392 error = gfs2_glock_nq(ghs + x);
1393 if (error)
1394 goto out_gunlock;
1395 }
1396
1397 error = -ENOENT;
1398 if (ip->i_inode.i_nlink == 0)
1399 goto out_gunlock;
1400
1401 /* Check out the old directory */
1402
1403 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1404 if (error)
1405 goto out_gunlock;
1406
1407 /* Check out the new directory */
1408
1409 if (nip) {
1410 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1411 if (error)
1412 goto out_gunlock;
1413
1414 if (nip->i_inode.i_nlink == 0) {
1415 error = -EAGAIN;
1416 goto out_gunlock;
1417 }
1418
1419 if (S_ISDIR(nip->i_inode.i_mode)) {
1420 if (nip->i_entries < 2) {
1421 gfs2_consist_inode(nip);
1422 error = -EIO;
1423 goto out_gunlock;
1424 }
1425 if (nip->i_entries > 2) {
1426 error = -ENOTEMPTY;
1427 goto out_gunlock;
1428 }
1429 }
1430 } else {
1431 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1432 if (error)
1433 goto out_gunlock;
1434
1435 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1436 switch (error) {
1437 case -ENOENT:
1438 error = 0;
1439 break;
1440 case 0:
1441 error = -EEXIST;
1442 default:
1443 goto out_gunlock;
1444 };
1445
1446 if (odip != ndip) {
1447 if (!ndip->i_inode.i_nlink) {
1448 error = -ENOENT;
1449 goto out_gunlock;
1450 }
1451 if (ndip->i_entries == (u32)-1) {
1452 error = -EFBIG;
1453 goto out_gunlock;
1454 }
1455 if (S_ISDIR(ip->i_inode.i_mode) &&
1456 ndip->i_inode.i_nlink == (u32)-1) {
1457 error = -EMLINK;
1458 goto out_gunlock;
1459 }
1460 }
1461 }
1462
1463 /* Check out the dir to be renamed */
1464
1465 if (dir_rename) {
1466 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1467 if (error)
1468 goto out_gunlock;
1469 }
1470
1471 if (nip == NULL) {
1472 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1473 if (error)
1474 goto out_gunlock;
1475 }
1476
1477 if (da.nr_blocks) {
1478 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1479 error = gfs2_quota_lock_check(ndip);
1480 if (error)
1481 goto out_gunlock;
1482
1483 error = gfs2_inplace_reserve(ndip, &ap);
1484 if (error)
1485 goto out_gunlock_q;
1486
1487 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1488 4 * RES_LEAF + 4, 0);
1489 if (error)
1490 goto out_ipreserv;
1491 } else {
1492 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1493 5 * RES_LEAF + 4, 0);
1494 if (error)
1495 goto out_gunlock;
1496 }
1497
1498 /* Remove the target file, if it exists */
1499
1500 if (nip)
1501 error = gfs2_unlink_inode(ndip, ndentry);
1502
1503 if (dir_rename) {
1504 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1505 if (error)
1506 goto out_end_trans;
1507 } else {
1508 struct buffer_head *dibh;
1509 error = gfs2_meta_inode_buffer(ip, &dibh);
1510 if (error)
1511 goto out_end_trans;
1512 ip->i_inode.i_ctime = CURRENT_TIME;
1513 gfs2_trans_add_meta(ip->i_gl, dibh);
1514 gfs2_dinode_out(ip, dibh->b_data);
1515 brelse(dibh);
1516 }
1517
1518 error = gfs2_dir_del(odip, odentry);
1519 if (error)
1520 goto out_end_trans;
1521
1522 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1523 if (error)
1524 goto out_end_trans;
1525
1526out_end_trans:
1527 gfs2_trans_end(sdp);
1528out_ipreserv:
1529 if (da.nr_blocks)
1530 gfs2_inplace_release(ndip);
1531out_gunlock_q:
1532 if (da.nr_blocks)
1533 gfs2_quota_unlock(ndip);
1534out_gunlock:
1535 gfs2_dir_no_add(&da);
1536 while (x--) {
1537 gfs2_glock_dq(ghs + x);
1538 gfs2_holder_uninit(ghs + x);
1539 }
1540out_gunlock_r:
1541 if (r_gh.gh_gl)
1542 gfs2_glock_dq_uninit(&r_gh);
1543out:
1544 return error;
1545}
1546
1547/**
1548 * gfs2_follow_link - Follow a symbolic link
1549 * @dentry: The dentry of the link
1550 * @nd: Data that we pass to vfs_follow_link()
1551 *
1552 * This can handle symlinks of any size.
1553 *
1554 * Returns: 0 on success or error code
1555 */
1556
1557static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1558{
1559 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1560 struct gfs2_holder i_gh;
1561 struct buffer_head *dibh;
1562 unsigned int size;
1563 char *buf;
1564 int error;
1565
1566 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1567 error = gfs2_glock_nq(&i_gh);
1568 if (error) {
1569 gfs2_holder_uninit(&i_gh);
1570 nd_set_link(nd, ERR_PTR(error));
1571 return NULL;
1572 }
1573
1574 size = (unsigned int)i_size_read(&ip->i_inode);
1575 if (size == 0) {
1576 gfs2_consist_inode(ip);
1577 buf = ERR_PTR(-EIO);
1578 goto out;
1579 }
1580
1581 error = gfs2_meta_inode_buffer(ip, &dibh);
1582 if (error) {
1583 buf = ERR_PTR(error);
1584 goto out;
1585 }
1586
1587 buf = kzalloc(size + 1, GFP_NOFS);
1588 if (!buf)
1589 buf = ERR_PTR(-ENOMEM);
1590 else
1591 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1592 brelse(dibh);
1593out:
1594 gfs2_glock_dq_uninit(&i_gh);
1595 nd_set_link(nd, buf);
1596 return NULL;
1597}
1598
1599/**
1600 * gfs2_permission -
1601 * @inode: The inode
1602 * @mask: The mask to be tested
1603 * @flags: Indicates whether this is an RCU path walk or not
1604 *
1605 * This may be called from the VFS directly, or from within GFS2 with the
1606 * inode locked, so we look to see if the glock is already locked and only
1607 * lock the glock if its not already been done.
1608 *
1609 * Returns: errno
1610 */
1611
1612int gfs2_permission(struct inode *inode, int mask)
1613{
1614 struct gfs2_inode *ip;
1615 struct gfs2_holder i_gh;
1616 int error;
1617 int unlock = 0;
1618
1619
1620 ip = GFS2_I(inode);
1621 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1622 if (mask & MAY_NOT_BLOCK)
1623 return -ECHILD;
1624 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1625 if (error)
1626 return error;
1627 unlock = 1;
1628 }
1629
1630 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1631 error = -EACCES;
1632 else
1633 error = generic_permission(inode, mask);
1634 if (unlock)
1635 gfs2_glock_dq_uninit(&i_gh);
1636
1637 return error;
1638}
1639
1640static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1641{
1642 setattr_copy(inode, attr);
1643 mark_inode_dirty(inode);
1644 return 0;
1645}
1646
1647/**
1648 * gfs2_setattr_simple -
1649 * @ip:
1650 * @attr:
1651 *
1652 * Returns: errno
1653 */
1654
1655int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1656{
1657 int error;
1658
1659 if (current->journal_info)
1660 return __gfs2_setattr_simple(inode, attr);
1661
1662 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1663 if (error)
1664 return error;
1665
1666 error = __gfs2_setattr_simple(inode, attr);
1667 gfs2_trans_end(GFS2_SB(inode));
1668 return error;
1669}
1670
1671static int setattr_chown(struct inode *inode, struct iattr *attr)
1672{
1673 struct gfs2_inode *ip = GFS2_I(inode);
1674 struct gfs2_sbd *sdp = GFS2_SB(inode);
1675 kuid_t ouid, nuid;
1676 kgid_t ogid, ngid;
1677 int error;
1678
1679 ouid = inode->i_uid;
1680 ogid = inode->i_gid;
1681 nuid = attr->ia_uid;
1682 ngid = attr->ia_gid;
1683
1684 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1685 ouid = nuid = NO_UID_QUOTA_CHANGE;
1686 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1687 ogid = ngid = NO_GID_QUOTA_CHANGE;
1688
1689 error = get_write_access(inode);
1690 if (error)
1691 return error;
1692
1693 error = gfs2_rs_alloc(ip);
1694 if (error)
1695 goto out;
1696
1697 error = gfs2_rindex_update(sdp);
1698 if (error)
1699 goto out;
1700
1701 error = gfs2_quota_lock(ip, nuid, ngid);
1702 if (error)
1703 goto out;
1704
1705 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1706 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1707 error = gfs2_quota_check(ip, nuid, ngid);
1708 if (error)
1709 goto out_gunlock_q;
1710 }
1711
1712 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1713 if (error)
1714 goto out_gunlock_q;
1715
1716 error = gfs2_setattr_simple(inode, attr);
1717 if (error)
1718 goto out_end_trans;
1719
1720 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1721 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1722 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1723 gfs2_quota_change(ip, -blocks, ouid, ogid);
1724 gfs2_quota_change(ip, blocks, nuid, ngid);
1725 }
1726
1727out_end_trans:
1728 gfs2_trans_end(sdp);
1729out_gunlock_q:
1730 gfs2_quota_unlock(ip);
1731out:
1732 put_write_access(inode);
1733 return error;
1734}
1735
1736/**
1737 * gfs2_setattr - Change attributes on an inode
1738 * @dentry: The dentry which is changing
1739 * @attr: The structure describing the change
1740 *
1741 * The VFS layer wants to change one or more of an inodes attributes. Write
1742 * that change out to disk.
1743 *
1744 * Returns: errno
1745 */
1746
1747static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1748{
1749 struct inode *inode = dentry->d_inode;
1750 struct gfs2_inode *ip = GFS2_I(inode);
1751 struct gfs2_holder i_gh;
1752 int error;
1753
1754 error = gfs2_rs_alloc(ip);
1755 if (error)
1756 return error;
1757
1758 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1759 if (error)
1760 return error;
1761
1762 error = -EPERM;
1763 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1764 goto out;
1765
1766 error = inode_change_ok(inode, attr);
1767 if (error)
1768 goto out;
1769
1770 if (attr->ia_valid & ATTR_SIZE)
1771 error = gfs2_setattr_size(inode, attr->ia_size);
1772 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1773 error = setattr_chown(inode, attr);
1774 else {
1775 error = gfs2_setattr_simple(inode, attr);
1776 if (!error && attr->ia_valid & ATTR_MODE)
1777 error = posix_acl_chmod(inode, inode->i_mode);
1778 }
1779
1780out:
1781 if (!error)
1782 mark_inode_dirty(inode);
1783 gfs2_glock_dq_uninit(&i_gh);
1784 return error;
1785}
1786
1787/**
1788 * gfs2_getattr - Read out an inode's attributes
1789 * @mnt: The vfsmount the inode is being accessed from
1790 * @dentry: The dentry to stat
1791 * @stat: The inode's stats
1792 *
1793 * This may be called from the VFS directly, or from within GFS2 with the
1794 * inode locked, so we look to see if the glock is already locked and only
1795 * lock the glock if its not already been done. Note that its the NFS
1796 * readdirplus operation which causes this to be called (from filldir)
1797 * with the glock already held.
1798 *
1799 * Returns: errno
1800 */
1801
1802static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1803 struct kstat *stat)
1804{
1805 struct inode *inode = dentry->d_inode;
1806 struct gfs2_inode *ip = GFS2_I(inode);
1807 struct gfs2_holder gh;
1808 int error;
1809 int unlock = 0;
1810
1811 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1812 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1813 if (error)
1814 return error;
1815 unlock = 1;
1816 }
1817
1818 generic_fillattr(inode, stat);
1819 if (unlock)
1820 gfs2_glock_dq_uninit(&gh);
1821
1822 return 0;
1823}
1824
1825static int gfs2_setxattr(struct dentry *dentry, const char *name,
1826 const void *data, size_t size, int flags)
1827{
1828 struct inode *inode = dentry->d_inode;
1829 struct gfs2_inode *ip = GFS2_I(inode);
1830 struct gfs2_holder gh;
1831 int ret;
1832
1833 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1834 ret = gfs2_glock_nq(&gh);
1835 if (ret == 0) {
1836 ret = gfs2_rs_alloc(ip);
1837 if (ret == 0)
1838 ret = generic_setxattr(dentry, name, data, size, flags);
1839 gfs2_glock_dq(&gh);
1840 }
1841 gfs2_holder_uninit(&gh);
1842 return ret;
1843}
1844
1845static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1846 void *data, size_t size)
1847{
1848 struct inode *inode = dentry->d_inode;
1849 struct gfs2_inode *ip = GFS2_I(inode);
1850 struct gfs2_holder gh;
1851 int ret;
1852
1853 /* For selinux during lookup */
1854 if (gfs2_glock_is_locked_by_me(ip->i_gl))
1855 return generic_getxattr(dentry, name, data, size);
1856
1857 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1858 ret = gfs2_glock_nq(&gh);
1859 if (ret == 0) {
1860 ret = generic_getxattr(dentry, name, data, size);
1861 gfs2_glock_dq(&gh);
1862 }
1863 gfs2_holder_uninit(&gh);
1864 return ret;
1865}
1866
1867static int gfs2_removexattr(struct dentry *dentry, const char *name)
1868{
1869 struct inode *inode = dentry->d_inode;
1870 struct gfs2_inode *ip = GFS2_I(inode);
1871 struct gfs2_holder gh;
1872 int ret;
1873
1874 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1875 ret = gfs2_glock_nq(&gh);
1876 if (ret == 0) {
1877 ret = gfs2_rs_alloc(ip);
1878 if (ret == 0)
1879 ret = generic_removexattr(dentry, name);
1880 gfs2_glock_dq(&gh);
1881 }
1882 gfs2_holder_uninit(&gh);
1883 return ret;
1884}
1885
1886static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1887 u64 start, u64 len)
1888{
1889 struct gfs2_inode *ip = GFS2_I(inode);
1890 struct gfs2_holder gh;
1891 int ret;
1892
1893 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1894 if (ret)
1895 return ret;
1896
1897 mutex_lock(&inode->i_mutex);
1898
1899 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1900 if (ret)
1901 goto out;
1902
1903 if (gfs2_is_stuffed(ip)) {
1904 u64 phys = ip->i_no_addr << inode->i_blkbits;
1905 u64 size = i_size_read(inode);
1906 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1907 FIEMAP_EXTENT_DATA_INLINE;
1908 phys += sizeof(struct gfs2_dinode);
1909 phys += start;
1910 if (start + len > size)
1911 len = size - start;
1912 if (start < size)
1913 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1914 len, flags);
1915 if (ret == 1)
1916 ret = 0;
1917 } else {
1918 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1919 gfs2_block_map);
1920 }
1921
1922 gfs2_glock_dq_uninit(&gh);
1923out:
1924 mutex_unlock(&inode->i_mutex);
1925 return ret;
1926}
1927
1928const struct inode_operations gfs2_file_iops = {
1929 .permission = gfs2_permission,
1930 .setattr = gfs2_setattr,
1931 .getattr = gfs2_getattr,
1932 .setxattr = gfs2_setxattr,
1933 .getxattr = gfs2_getxattr,
1934 .listxattr = gfs2_listxattr,
1935 .removexattr = gfs2_removexattr,
1936 .fiemap = gfs2_fiemap,
1937 .get_acl = gfs2_get_acl,
1938 .set_acl = gfs2_set_acl,
1939};
1940
1941const struct inode_operations gfs2_dir_iops = {
1942 .create = gfs2_create,
1943 .lookup = gfs2_lookup,
1944 .link = gfs2_link,
1945 .unlink = gfs2_unlink,
1946 .symlink = gfs2_symlink,
1947 .mkdir = gfs2_mkdir,
1948 .rmdir = gfs2_unlink,
1949 .mknod = gfs2_mknod,
1950 .rename = gfs2_rename,
1951 .permission = gfs2_permission,
1952 .setattr = gfs2_setattr,
1953 .getattr = gfs2_getattr,
1954 .setxattr = gfs2_setxattr,
1955 .getxattr = gfs2_getxattr,
1956 .listxattr = gfs2_listxattr,
1957 .removexattr = gfs2_removexattr,
1958 .fiemap = gfs2_fiemap,
1959 .get_acl = gfs2_get_acl,
1960 .set_acl = gfs2_set_acl,
1961 .atomic_open = gfs2_atomic_open,
1962};
1963
1964const struct inode_operations gfs2_symlink_iops = {
1965 .readlink = generic_readlink,
1966 .follow_link = gfs2_follow_link,
1967 .put_link = kfree_put_link,
1968 .permission = gfs2_permission,
1969 .setattr = gfs2_setattr,
1970 .getattr = gfs2_getattr,
1971 .setxattr = gfs2_setxattr,
1972 .getxattr = gfs2_getxattr,
1973 .listxattr = gfs2_listxattr,
1974 .removexattr = gfs2_removexattr,
1975 .fiemap = gfs2_fiemap,
1976};
1977
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 <linux/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
40static int iget_test(struct inode *inode, void *opaque)
41{
42 u64 no_addr = *(u64 *)opaque;
43
44 return GFS2_I(inode)->i_no_addr == no_addr;
45}
46
47static int iget_set(struct inode *inode, void *opaque)
48{
49 u64 no_addr = *(u64 *)opaque;
50
51 GFS2_I(inode)->i_no_addr = no_addr;
52 inode->i_ino = no_addr;
53 return 0;
54}
55
56static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
57{
58 struct inode *inode;
59
60repeat:
61 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
62 if (!inode)
63 return inode;
64 if (is_bad_inode(inode)) {
65 iput(inode);
66 goto repeat;
67 }
68 return inode;
69}
70
71/**
72 * gfs2_set_iop - Sets inode operations
73 * @inode: The inode with correct i_mode filled in
74 *
75 * GFS2 lookup code fills in vfs inode contents based on info obtained
76 * from directory entry inside gfs2_inode_lookup().
77 */
78
79static void gfs2_set_iop(struct inode *inode)
80{
81 struct gfs2_sbd *sdp = GFS2_SB(inode);
82 umode_t mode = inode->i_mode;
83
84 if (S_ISREG(mode)) {
85 inode->i_op = &gfs2_file_iops;
86 if (gfs2_localflocks(sdp))
87 inode->i_fop = &gfs2_file_fops_nolock;
88 else
89 inode->i_fop = &gfs2_file_fops;
90 } else if (S_ISDIR(mode)) {
91 inode->i_op = &gfs2_dir_iops;
92 if (gfs2_localflocks(sdp))
93 inode->i_fop = &gfs2_dir_fops_nolock;
94 else
95 inode->i_fop = &gfs2_dir_fops;
96 } else if (S_ISLNK(mode)) {
97 inode->i_op = &gfs2_symlink_iops;
98 } else {
99 inode->i_op = &gfs2_file_iops;
100 init_special_inode(inode, inode->i_mode, inode->i_rdev);
101 }
102}
103
104/**
105 * gfs2_inode_lookup - Lookup an inode
106 * @sb: The super block
107 * @type: The type of the inode
108 * @no_addr: The inode number
109 * @no_formal_ino: The inode generation number
110 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
111 * GFS2_BLKST_FREE do indicate not to verify)
112 *
113 * If @type is DT_UNKNOWN, the inode type is fetched from disk.
114 *
115 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
116 * placeholder because it doesn't otherwise make sense), the on-disk block type
117 * is verified to be @blktype.
118 *
119 * Returns: A VFS inode, or an error
120 */
121
122struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
123 u64 no_addr, u64 no_formal_ino,
124 unsigned int blktype)
125{
126 struct inode *inode;
127 struct gfs2_inode *ip;
128 struct gfs2_glock *io_gl = NULL;
129 struct gfs2_holder i_gh;
130 int error;
131
132 gfs2_holder_mark_uninitialized(&i_gh);
133 inode = gfs2_iget(sb, no_addr);
134 if (!inode)
135 return ERR_PTR(-ENOMEM);
136
137 ip = GFS2_I(inode);
138
139 if (inode->i_state & I_NEW) {
140 struct gfs2_sbd *sdp = GFS2_SB(inode);
141 ip->i_no_formal_ino = no_formal_ino;
142
143 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
144 if (unlikely(error))
145 goto fail;
146 ip->i_gl->gl_object = ip;
147
148 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
149 if (unlikely(error))
150 goto fail_put;
151
152 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
153 /*
154 * The GL_SKIP flag indicates to skip reading the inode
155 * block. We read the inode with gfs2_inode_refresh
156 * after possibly checking the block type.
157 */
158 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
159 GL_SKIP, &i_gh);
160 if (error)
161 goto fail_put;
162
163 if (blktype != GFS2_BLKST_FREE) {
164 error = gfs2_check_blk_type(sdp, no_addr,
165 blktype);
166 if (error)
167 goto fail_put;
168 }
169 }
170
171 set_bit(GIF_INVALID, &ip->i_flags);
172 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
173 if (unlikely(error))
174 goto fail_put;
175
176 ip->i_iopen_gh.gh_gl->gl_object = ip;
177 gfs2_glock_put(io_gl);
178 io_gl = NULL;
179
180 if (type == DT_UNKNOWN) {
181 /* Inode glock must be locked already */
182 error = gfs2_inode_refresh(GFS2_I(inode));
183 if (error)
184 goto fail_refresh;
185 } else {
186 inode->i_mode = DT2IF(type);
187 }
188
189 gfs2_set_iop(inode);
190
191 inode->i_atime.tv_sec = 0;
192 inode->i_atime.tv_nsec = 0;
193
194 unlock_new_inode(inode);
195 }
196
197 if (gfs2_holder_initialized(&i_gh))
198 gfs2_glock_dq_uninit(&i_gh);
199 return inode;
200
201fail_refresh:
202 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
203 ip->i_iopen_gh.gh_gl->gl_object = NULL;
204 gfs2_glock_dq_wait(&ip->i_iopen_gh);
205 gfs2_holder_uninit(&ip->i_iopen_gh);
206fail_put:
207 if (io_gl)
208 gfs2_glock_put(io_gl);
209 if (gfs2_holder_initialized(&i_gh))
210 gfs2_glock_dq_uninit(&i_gh);
211 ip->i_gl->gl_object = NULL;
212fail:
213 iget_failed(inode);
214 return ERR_PTR(error);
215}
216
217struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
218 u64 *no_formal_ino, unsigned int blktype)
219{
220 struct super_block *sb = sdp->sd_vfs;
221 struct inode *inode;
222 int error;
223
224 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, blktype);
225 if (IS_ERR(inode))
226 return inode;
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 return inode;
239
240fail_iput:
241 iput(inode);
242 return ERR_PTR(error);
243}
244
245
246struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
247{
248 struct qstr qstr;
249 struct inode *inode;
250 gfs2_str2qstr(&qstr, name);
251 inode = gfs2_lookupi(dip, &qstr, 1);
252 /* gfs2_lookupi has inconsistent callers: vfs
253 * related routines expect NULL for no entry found,
254 * gfs2_lookup_simple callers expect ENOENT
255 * and do not check for NULL.
256 */
257 if (inode == NULL)
258 return ERR_PTR(-ENOENT);
259 else
260 return inode;
261}
262
263
264/**
265 * gfs2_lookupi - Look up a filename in a directory and return its inode
266 * @d_gh: An initialized holder for the directory glock
267 * @name: The name of the inode to look for
268 * @is_root: If 1, ignore the caller's permissions
269 * @i_gh: An uninitialized holder for the new inode glock
270 *
271 * This can be called via the VFS filldir function when NFS is doing
272 * a readdirplus and the inode which its intending to stat isn't
273 * already in cache. In this case we must not take the directory glock
274 * again, since the readdir call will have already taken that lock.
275 *
276 * Returns: errno
277 */
278
279struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
280 int is_root)
281{
282 struct super_block *sb = dir->i_sb;
283 struct gfs2_inode *dip = GFS2_I(dir);
284 struct gfs2_holder d_gh;
285 int error = 0;
286 struct inode *inode = NULL;
287
288 gfs2_holder_mark_uninitialized(&d_gh);
289 if (!name->len || name->len > GFS2_FNAMESIZE)
290 return ERR_PTR(-ENAMETOOLONG);
291
292 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
293 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
294 dir == d_inode(sb->s_root))) {
295 igrab(dir);
296 return dir;
297 }
298
299 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
300 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
301 if (error)
302 return ERR_PTR(error);
303 }
304
305 if (!is_root) {
306 error = gfs2_permission(dir, MAY_EXEC);
307 if (error)
308 goto out;
309 }
310
311 inode = gfs2_dir_search(dir, name, false);
312 if (IS_ERR(inode))
313 error = PTR_ERR(inode);
314out:
315 if (gfs2_holder_initialized(&d_gh))
316 gfs2_glock_dq_uninit(&d_gh);
317 if (error == -ENOENT)
318 return NULL;
319 return inode ? inode : ERR_PTR(error);
320}
321
322/**
323 * create_ok - OK to create a new on-disk inode here?
324 * @dip: Directory in which dinode is to be created
325 * @name: Name of new dinode
326 * @mode:
327 *
328 * Returns: errno
329 */
330
331static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
332 umode_t mode)
333{
334 int error;
335
336 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
337 if (error)
338 return error;
339
340 /* Don't create entries in an unlinked directory */
341 if (!dip->i_inode.i_nlink)
342 return -ENOENT;
343
344 if (dip->i_entries == (u32)-1)
345 return -EFBIG;
346 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
347 return -EMLINK;
348
349 return 0;
350}
351
352static void munge_mode_uid_gid(const struct gfs2_inode *dip,
353 struct inode *inode)
354{
355 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
356 (dip->i_inode.i_mode & S_ISUID) &&
357 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
358 if (S_ISDIR(inode->i_mode))
359 inode->i_mode |= S_ISUID;
360 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
361 inode->i_mode &= ~07111;
362 inode->i_uid = dip->i_inode.i_uid;
363 } else
364 inode->i_uid = current_fsuid();
365
366 if (dip->i_inode.i_mode & S_ISGID) {
367 if (S_ISDIR(inode->i_mode))
368 inode->i_mode |= S_ISGID;
369 inode->i_gid = dip->i_inode.i_gid;
370 } else
371 inode->i_gid = current_fsgid();
372}
373
374static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
375{
376 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
377 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
378 int error;
379
380 error = gfs2_quota_lock_check(ip, &ap);
381 if (error)
382 goto out;
383
384 error = gfs2_inplace_reserve(ip, &ap);
385 if (error)
386 goto out_quota;
387
388 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
389 if (error)
390 goto out_ipreserv;
391
392 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
393 ip->i_no_formal_ino = ip->i_generation;
394 ip->i_inode.i_ino = ip->i_no_addr;
395 ip->i_goal = ip->i_no_addr;
396
397 gfs2_trans_end(sdp);
398
399out_ipreserv:
400 gfs2_inplace_release(ip);
401out_quota:
402 gfs2_quota_unlock(ip);
403out:
404 return error;
405}
406
407static void gfs2_init_dir(struct buffer_head *dibh,
408 const struct gfs2_inode *parent)
409{
410 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
411 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
412
413 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
414 dent->de_inum = di->di_num; /* already GFS2 endian */
415 dent->de_type = cpu_to_be16(DT_DIR);
416
417 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
418 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
419 gfs2_inum_out(parent, dent);
420 dent->de_type = cpu_to_be16(DT_DIR);
421
422}
423
424/**
425 * gfs2_init_xattr - Initialise an xattr block for a new inode
426 * @ip: The inode in question
427 *
428 * This sets up an empty xattr block for a new inode, ready to
429 * take any ACLs, LSM xattrs, etc.
430 */
431
432static void gfs2_init_xattr(struct gfs2_inode *ip)
433{
434 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
435 struct buffer_head *bh;
436 struct gfs2_ea_header *ea;
437
438 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
439 gfs2_trans_add_meta(ip->i_gl, bh);
440 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
441 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
442
443 ea = GFS2_EA_BH2FIRST(bh);
444 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
445 ea->ea_type = GFS2_EATYPE_UNUSED;
446 ea->ea_flags = GFS2_EAFLAG_LAST;
447
448 brelse(bh);
449}
450
451/**
452 * init_dinode - Fill in a new dinode structure
453 * @dip: The directory this inode is being created in
454 * @ip: The inode
455 * @symname: The symlink destination (if a symlink)
456 * @bhp: The buffer head (returned to caller)
457 *
458 */
459
460static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
461 const char *symname)
462{
463 struct gfs2_dinode *di;
464 struct buffer_head *dibh;
465
466 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
467 gfs2_trans_add_meta(ip->i_gl, dibh);
468 di = (struct gfs2_dinode *)dibh->b_data;
469 gfs2_dinode_out(ip, di);
470
471 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
472 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
473 di->__pad1 = 0;
474 di->__pad2 = 0;
475 di->__pad3 = 0;
476 memset(&di->__pad4, 0, sizeof(di->__pad4));
477 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
478 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
479
480 switch(ip->i_inode.i_mode & S_IFMT) {
481 case S_IFDIR:
482 gfs2_init_dir(dibh, dip);
483 break;
484 case S_IFLNK:
485 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
486 break;
487 }
488
489 set_buffer_uptodate(dibh);
490 brelse(dibh);
491}
492
493/**
494 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
495 * @dip: The directory we are linking into
496 * @da: The dir add information
497 * @nr_inodes: The number of inodes involved
498 *
499 * This calculate the number of blocks we need to reserve in a
500 * transaction to link @nr_inodes into a directory. In most cases
501 * @nr_inodes will be 2 (the directory plus the inode being linked in)
502 * but in case of rename, 4 may be required.
503 *
504 * Returns: Number of blocks
505 */
506
507static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
508 const struct gfs2_diradd *da,
509 unsigned nr_inodes)
510{
511 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
512 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
513}
514
515static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
516 struct gfs2_inode *ip, struct gfs2_diradd *da)
517{
518 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
519 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
520 int error;
521
522 if (da->nr_blocks) {
523 error = gfs2_quota_lock_check(dip, &ap);
524 if (error)
525 goto fail_quota_locks;
526
527 error = gfs2_inplace_reserve(dip, &ap);
528 if (error)
529 goto fail_quota_locks;
530
531 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
532 if (error)
533 goto fail_ipreserv;
534 } else {
535 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
536 if (error)
537 goto fail_quota_locks;
538 }
539
540 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
541
542 gfs2_trans_end(sdp);
543fail_ipreserv:
544 gfs2_inplace_release(dip);
545fail_quota_locks:
546 gfs2_quota_unlock(dip);
547 return error;
548}
549
550static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
551 void *fs_info)
552{
553 const struct xattr *xattr;
554 int err = 0;
555
556 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
557 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
558 xattr->value_len, 0,
559 GFS2_EATYPE_SECURITY);
560 if (err < 0)
561 break;
562 }
563 return err;
564}
565
566/**
567 * gfs2_create_inode - Create a new inode
568 * @dir: The parent directory
569 * @dentry: The new dentry
570 * @file: If non-NULL, the file which is being opened
571 * @mode: The permissions on the new inode
572 * @dev: For device nodes, this is the device number
573 * @symname: For symlinks, this is the link destination
574 * @size: The initial size of the inode (ignored for directories)
575 *
576 * Returns: 0 on success, or error code
577 */
578
579static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
580 struct file *file,
581 umode_t mode, dev_t dev, const char *symname,
582 unsigned int size, int excl, int *opened)
583{
584 const struct qstr *name = &dentry->d_name;
585 struct posix_acl *default_acl, *acl;
586 struct gfs2_holder ghs[2];
587 struct inode *inode = NULL;
588 struct gfs2_inode *dip = GFS2_I(dir), *ip;
589 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
590 struct gfs2_glock *io_gl = NULL;
591 int error, free_vfs_inode = 1;
592 u32 aflags = 0;
593 unsigned blocks = 1;
594 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
595
596 if (!name->len || name->len > GFS2_FNAMESIZE)
597 return -ENAMETOOLONG;
598
599 error = gfs2_rsqa_alloc(dip);
600 if (error)
601 return error;
602
603 error = gfs2_rindex_update(sdp);
604 if (error)
605 return error;
606
607 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
608 if (error)
609 goto fail;
610
611 error = create_ok(dip, name, mode);
612 if (error)
613 goto fail_gunlock;
614
615 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
616 error = PTR_ERR(inode);
617 if (!IS_ERR(inode)) {
618 if (S_ISDIR(inode->i_mode)) {
619 iput(inode);
620 inode = ERR_PTR(-EISDIR);
621 goto fail_gunlock;
622 }
623 d_instantiate(dentry, inode);
624 error = 0;
625 if (file) {
626 if (S_ISREG(inode->i_mode))
627 error = finish_open(file, dentry, gfs2_open_common, opened);
628 else
629 error = finish_no_open(file, NULL);
630 }
631 gfs2_glock_dq_uninit(ghs);
632 return error;
633 } else if (error != -ENOENT) {
634 goto fail_gunlock;
635 }
636
637 error = gfs2_diradd_alloc_required(dir, name, &da);
638 if (error < 0)
639 goto fail_gunlock;
640
641 inode = new_inode(sdp->sd_vfs);
642 error = -ENOMEM;
643 if (!inode)
644 goto fail_gunlock;
645
646 error = posix_acl_create(dir, &mode, &default_acl, &acl);
647 if (error)
648 goto fail_gunlock;
649
650 ip = GFS2_I(inode);
651 error = gfs2_rsqa_alloc(ip);
652 if (error)
653 goto fail_free_acls;
654
655 inode->i_mode = mode;
656 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
657 inode->i_rdev = dev;
658 inode->i_size = size;
659 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
660 gfs2_set_inode_blocks(inode, 1);
661 munge_mode_uid_gid(dip, inode);
662 check_and_update_goal(dip);
663 ip->i_goal = dip->i_goal;
664 ip->i_diskflags = 0;
665 ip->i_eattr = 0;
666 ip->i_height = 0;
667 ip->i_depth = 0;
668 ip->i_entries = 0;
669
670 switch(mode & S_IFMT) {
671 case S_IFREG:
672 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
673 gfs2_tune_get(sdp, gt_new_files_jdata))
674 ip->i_diskflags |= GFS2_DIF_JDATA;
675 gfs2_set_aops(inode);
676 break;
677 case S_IFDIR:
678 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
679 ip->i_diskflags |= GFS2_DIF_JDATA;
680 ip->i_entries = 2;
681 break;
682 }
683
684 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
685 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
686 ip->i_diskflags |= GFS2_DIF_SYSTEM;
687
688 gfs2_set_inode_flags(inode);
689
690 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
691 (dip->i_diskflags & GFS2_DIF_TOPDIR))
692 aflags |= GFS2_AF_ORLOV;
693
694 if (default_acl || acl)
695 blocks++;
696
697 error = alloc_dinode(ip, aflags, &blocks);
698 if (error)
699 goto fail_free_inode;
700
701 gfs2_set_inode_blocks(inode, blocks);
702
703 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
704 if (error)
705 goto fail_free_inode;
706
707 ip->i_gl->gl_object = ip;
708 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
709 if (error)
710 goto fail_free_inode;
711
712 error = gfs2_trans_begin(sdp, blocks, 0);
713 if (error)
714 goto fail_gunlock2;
715
716 if (blocks > 1) {
717 ip->i_eattr = ip->i_no_addr + 1;
718 gfs2_init_xattr(ip);
719 }
720 init_dinode(dip, ip, symname);
721 gfs2_trans_end(sdp);
722
723 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
724 if (error)
725 goto fail_gunlock2;
726
727 BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));
728
729 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
730 if (error)
731 goto fail_gunlock2;
732
733 ip->i_iopen_gh.gh_gl->gl_object = ip;
734 gfs2_glock_put(io_gl);
735 gfs2_set_iop(inode);
736 insert_inode_hash(inode);
737
738 free_vfs_inode = 0; /* After this point, the inode is no longer
739 considered free. Any failures need to undo
740 the gfs2 structures. */
741 if (default_acl) {
742 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
743 posix_acl_release(default_acl);
744 }
745 if (acl) {
746 if (!error)
747 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
748 posix_acl_release(acl);
749 }
750
751 if (error)
752 goto fail_gunlock3;
753
754 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
755 &gfs2_initxattrs, NULL);
756 if (error)
757 goto fail_gunlock3;
758
759 error = link_dinode(dip, name, ip, &da);
760 if (error)
761 goto fail_gunlock3;
762
763 mark_inode_dirty(inode);
764 d_instantiate(dentry, inode);
765 if (file) {
766 *opened |= FILE_CREATED;
767 error = finish_open(file, dentry, gfs2_open_common, opened);
768 }
769 gfs2_glock_dq_uninit(ghs);
770 gfs2_glock_dq_uninit(ghs + 1);
771 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
772 return error;
773
774fail_gunlock3:
775 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
776 gfs2_glock_put(io_gl);
777fail_gunlock2:
778 if (io_gl)
779 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
780 gfs2_glock_dq_uninit(ghs + 1);
781fail_free_inode:
782 if (ip->i_gl)
783 gfs2_glock_put(ip->i_gl);
784 gfs2_rsqa_delete(ip, NULL);
785fail_free_acls:
786 if (default_acl)
787 posix_acl_release(default_acl);
788 if (acl)
789 posix_acl_release(acl);
790fail_gunlock:
791 gfs2_dir_no_add(&da);
792 gfs2_glock_dq_uninit(ghs);
793 if (inode && !IS_ERR(inode)) {
794 clear_nlink(inode);
795 if (!free_vfs_inode)
796 mark_inode_dirty(inode);
797 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
798 &GFS2_I(inode)->i_flags);
799 iput(inode);
800 }
801fail:
802 return error;
803}
804
805/**
806 * gfs2_create - Create a file
807 * @dir: The directory in which to create the file
808 * @dentry: The dentry of the new file
809 * @mode: The mode of the new file
810 *
811 * Returns: errno
812 */
813
814static int gfs2_create(struct inode *dir, struct dentry *dentry,
815 umode_t mode, bool excl)
816{
817 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
818}
819
820/**
821 * __gfs2_lookup - Look up a filename in a directory and return its inode
822 * @dir: The directory inode
823 * @dentry: The dentry of the new inode
824 * @file: File to be opened
825 * @opened: atomic_open flags
826 *
827 *
828 * Returns: errno
829 */
830
831static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
832 struct file *file, int *opened)
833{
834 struct inode *inode;
835 struct dentry *d;
836 struct gfs2_holder gh;
837 struct gfs2_glock *gl;
838 int error;
839
840 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
841 if (inode == NULL) {
842 d_add(dentry, NULL);
843 return NULL;
844 }
845 if (IS_ERR(inode))
846 return ERR_CAST(inode);
847
848 gl = GFS2_I(inode)->i_gl;
849 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
850 if (error) {
851 iput(inode);
852 return ERR_PTR(error);
853 }
854
855 d = d_splice_alias(inode, dentry);
856 if (IS_ERR(d)) {
857 gfs2_glock_dq_uninit(&gh);
858 return d;
859 }
860 if (file && S_ISREG(inode->i_mode))
861 error = finish_open(file, dentry, gfs2_open_common, opened);
862
863 gfs2_glock_dq_uninit(&gh);
864 if (error) {
865 dput(d);
866 return ERR_PTR(error);
867 }
868 return d;
869}
870
871static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
872 unsigned flags)
873{
874 return __gfs2_lookup(dir, dentry, NULL, NULL);
875}
876
877/**
878 * gfs2_link - Link to a file
879 * @old_dentry: The inode to link
880 * @dir: Add link to this directory
881 * @dentry: The name of the link
882 *
883 * Link the inode in "old_dentry" into the directory "dir" with the
884 * name in "dentry".
885 *
886 * Returns: errno
887 */
888
889static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
890 struct dentry *dentry)
891{
892 struct gfs2_inode *dip = GFS2_I(dir);
893 struct gfs2_sbd *sdp = GFS2_SB(dir);
894 struct inode *inode = d_inode(old_dentry);
895 struct gfs2_inode *ip = GFS2_I(inode);
896 struct gfs2_holder ghs[2];
897 struct buffer_head *dibh;
898 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
899 int error;
900
901 if (S_ISDIR(inode->i_mode))
902 return -EPERM;
903
904 error = gfs2_rsqa_alloc(dip);
905 if (error)
906 return error;
907
908 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
909 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
910
911 error = gfs2_glock_nq(ghs); /* parent */
912 if (error)
913 goto out_parent;
914
915 error = gfs2_glock_nq(ghs + 1); /* child */
916 if (error)
917 goto out_child;
918
919 error = -ENOENT;
920 if (inode->i_nlink == 0)
921 goto out_gunlock;
922
923 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
924 if (error)
925 goto out_gunlock;
926
927 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
928 switch (error) {
929 case -ENOENT:
930 break;
931 case 0:
932 error = -EEXIST;
933 default:
934 goto out_gunlock;
935 }
936
937 error = -EINVAL;
938 if (!dip->i_inode.i_nlink)
939 goto out_gunlock;
940 error = -EFBIG;
941 if (dip->i_entries == (u32)-1)
942 goto out_gunlock;
943 error = -EPERM;
944 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
945 goto out_gunlock;
946 error = -EINVAL;
947 if (!ip->i_inode.i_nlink)
948 goto out_gunlock;
949 error = -EMLINK;
950 if (ip->i_inode.i_nlink == (u32)-1)
951 goto out_gunlock;
952
953 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
954 if (error < 0)
955 goto out_gunlock;
956
957 if (da.nr_blocks) {
958 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
959 error = gfs2_quota_lock_check(dip, &ap);
960 if (error)
961 goto out_gunlock;
962
963 error = gfs2_inplace_reserve(dip, &ap);
964 if (error)
965 goto out_gunlock_q;
966
967 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
968 if (error)
969 goto out_ipres;
970 } else {
971 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
972 if (error)
973 goto out_ipres;
974 }
975
976 error = gfs2_meta_inode_buffer(ip, &dibh);
977 if (error)
978 goto out_end_trans;
979
980 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
981 if (error)
982 goto out_brelse;
983
984 gfs2_trans_add_meta(ip->i_gl, dibh);
985 inc_nlink(&ip->i_inode);
986 ip->i_inode.i_ctime = current_time(&ip->i_inode);
987 ihold(inode);
988 d_instantiate(dentry, inode);
989 mark_inode_dirty(inode);
990
991out_brelse:
992 brelse(dibh);
993out_end_trans:
994 gfs2_trans_end(sdp);
995out_ipres:
996 if (da.nr_blocks)
997 gfs2_inplace_release(dip);
998out_gunlock_q:
999 if (da.nr_blocks)
1000 gfs2_quota_unlock(dip);
1001out_gunlock:
1002 gfs2_dir_no_add(&da);
1003 gfs2_glock_dq(ghs + 1);
1004out_child:
1005 gfs2_glock_dq(ghs);
1006out_parent:
1007 gfs2_holder_uninit(ghs);
1008 gfs2_holder_uninit(ghs + 1);
1009 return error;
1010}
1011
1012/*
1013 * gfs2_unlink_ok - check to see that a inode is still in a directory
1014 * @dip: the directory
1015 * @name: the name of the file
1016 * @ip: the inode
1017 *
1018 * Assumes that the lock on (at least) @dip is held.
1019 *
1020 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1021 */
1022
1023static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1024 const struct gfs2_inode *ip)
1025{
1026 int error;
1027
1028 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1029 return -EPERM;
1030
1031 if ((dip->i_inode.i_mode & S_ISVTX) &&
1032 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1033 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1034 return -EPERM;
1035
1036 if (IS_APPEND(&dip->i_inode))
1037 return -EPERM;
1038
1039 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1040 if (error)
1041 return error;
1042
1043 return gfs2_dir_check(&dip->i_inode, name, ip);
1044}
1045
1046/**
1047 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1048 * @dip: The parent directory
1049 * @name: The name of the entry in the parent directory
1050 * @inode: The inode to be removed
1051 *
1052 * Called with all the locks and in a transaction. This will only be
1053 * called for a directory after it has been checked to ensure it is empty.
1054 *
1055 * Returns: 0 on success, or an error
1056 */
1057
1058static int gfs2_unlink_inode(struct gfs2_inode *dip,
1059 const struct dentry *dentry)
1060{
1061 struct inode *inode = d_inode(dentry);
1062 struct gfs2_inode *ip = GFS2_I(inode);
1063 int error;
1064
1065 error = gfs2_dir_del(dip, dentry);
1066 if (error)
1067 return error;
1068
1069 ip->i_entries = 0;
1070 inode->i_ctime = current_time(inode);
1071 if (S_ISDIR(inode->i_mode))
1072 clear_nlink(inode);
1073 else
1074 drop_nlink(inode);
1075 mark_inode_dirty(inode);
1076 if (inode->i_nlink == 0)
1077 gfs2_unlink_di(inode);
1078 return 0;
1079}
1080
1081
1082/**
1083 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1084 * @dir: The inode of the directory containing the inode to unlink
1085 * @dentry: The file itself
1086 *
1087 * This routine uses the type of the inode as a flag to figure out
1088 * whether this is an unlink or an rmdir.
1089 *
1090 * Returns: errno
1091 */
1092
1093static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1094{
1095 struct gfs2_inode *dip = GFS2_I(dir);
1096 struct gfs2_sbd *sdp = GFS2_SB(dir);
1097 struct inode *inode = d_inode(dentry);
1098 struct gfs2_inode *ip = GFS2_I(inode);
1099 struct gfs2_holder ghs[3];
1100 struct gfs2_rgrpd *rgd;
1101 int error;
1102
1103 error = gfs2_rindex_update(sdp);
1104 if (error)
1105 return error;
1106
1107 error = -EROFS;
1108
1109 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1110 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1111
1112 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1113 if (!rgd)
1114 goto out_inodes;
1115
1116 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1117
1118
1119 error = gfs2_glock_nq(ghs); /* parent */
1120 if (error)
1121 goto out_parent;
1122
1123 error = gfs2_glock_nq(ghs + 1); /* child */
1124 if (error)
1125 goto out_child;
1126
1127 error = -ENOENT;
1128 if (inode->i_nlink == 0)
1129 goto out_rgrp;
1130
1131 if (S_ISDIR(inode->i_mode)) {
1132 error = -ENOTEMPTY;
1133 if (ip->i_entries > 2 || inode->i_nlink > 2)
1134 goto out_rgrp;
1135 }
1136
1137 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1138 if (error)
1139 goto out_rgrp;
1140
1141 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1142 if (error)
1143 goto out_gunlock;
1144
1145 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1146 if (error)
1147 goto out_end_trans;
1148
1149 error = gfs2_unlink_inode(dip, dentry);
1150
1151out_end_trans:
1152 gfs2_trans_end(sdp);
1153out_gunlock:
1154 gfs2_glock_dq(ghs + 2);
1155out_rgrp:
1156 gfs2_glock_dq(ghs + 1);
1157out_child:
1158 gfs2_glock_dq(ghs);
1159out_parent:
1160 gfs2_holder_uninit(ghs + 2);
1161out_inodes:
1162 gfs2_holder_uninit(ghs + 1);
1163 gfs2_holder_uninit(ghs);
1164 return error;
1165}
1166
1167/**
1168 * gfs2_symlink - Create a symlink
1169 * @dir: The directory to create the symlink in
1170 * @dentry: The dentry to put the symlink in
1171 * @symname: The thing which the link points to
1172 *
1173 * Returns: errno
1174 */
1175
1176static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1177 const char *symname)
1178{
1179 struct gfs2_sbd *sdp = GFS2_SB(dir);
1180 unsigned int size;
1181
1182 size = strlen(symname);
1183 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1184 return -ENAMETOOLONG;
1185
1186 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1187}
1188
1189/**
1190 * gfs2_mkdir - Make a directory
1191 * @dir: The parent directory of the new one
1192 * @dentry: The dentry of the new directory
1193 * @mode: The mode of the new directory
1194 *
1195 * Returns: errno
1196 */
1197
1198static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1199{
1200 struct gfs2_sbd *sdp = GFS2_SB(dir);
1201 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1202 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1203}
1204
1205/**
1206 * gfs2_mknod - Make a special file
1207 * @dir: The directory in which the special file will reside
1208 * @dentry: The dentry of the special file
1209 * @mode: The mode of the special file
1210 * @dev: The device specification of the special file
1211 *
1212 */
1213
1214static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1215 dev_t dev)
1216{
1217 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1218}
1219
1220/**
1221 * gfs2_atomic_open - Atomically open a file
1222 * @dir: The directory
1223 * @dentry: The proposed new entry
1224 * @file: The proposed new struct file
1225 * @flags: open flags
1226 * @mode: File mode
1227 * @opened: Flag to say whether the file has been opened or not
1228 *
1229 * Returns: error code or 0 for success
1230 */
1231
1232static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1233 struct file *file, unsigned flags,
1234 umode_t mode, int *opened)
1235{
1236 struct dentry *d;
1237 bool excl = !!(flags & O_EXCL);
1238
1239 if (!d_in_lookup(dentry))
1240 goto skip_lookup;
1241
1242 d = __gfs2_lookup(dir, dentry, file, opened);
1243 if (IS_ERR(d))
1244 return PTR_ERR(d);
1245 if (d != NULL)
1246 dentry = d;
1247 if (d_really_is_positive(dentry)) {
1248 if (!(*opened & FILE_OPENED))
1249 return finish_no_open(file, d);
1250 dput(d);
1251 return 0;
1252 }
1253
1254 BUG_ON(d != NULL);
1255
1256skip_lookup:
1257 if (!(flags & O_CREAT))
1258 return -ENOENT;
1259
1260 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1261}
1262
1263/*
1264 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1265 * @this: move this
1266 * @to: to here
1267 *
1268 * Follow @to back to the root and make sure we don't encounter @this
1269 * Assumes we already hold the rename lock.
1270 *
1271 * Returns: errno
1272 */
1273
1274static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1275{
1276 struct inode *dir = &to->i_inode;
1277 struct super_block *sb = dir->i_sb;
1278 struct inode *tmp;
1279 int error = 0;
1280
1281 igrab(dir);
1282
1283 for (;;) {
1284 if (dir == &this->i_inode) {
1285 error = -EINVAL;
1286 break;
1287 }
1288 if (dir == d_inode(sb->s_root)) {
1289 error = 0;
1290 break;
1291 }
1292
1293 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1294 if (!tmp) {
1295 error = -ENOENT;
1296 break;
1297 }
1298 if (IS_ERR(tmp)) {
1299 error = PTR_ERR(tmp);
1300 break;
1301 }
1302
1303 iput(dir);
1304 dir = tmp;
1305 }
1306
1307 iput(dir);
1308
1309 return error;
1310}
1311
1312/**
1313 * update_moved_ino - Update an inode that's being moved
1314 * @ip: The inode being moved
1315 * @ndip: The parent directory of the new filename
1316 * @dir_rename: True of ip is a directory
1317 *
1318 * Returns: errno
1319 */
1320
1321static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1322 int dir_rename)
1323{
1324 int error;
1325 struct buffer_head *dibh;
1326
1327 if (dir_rename)
1328 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1329
1330 error = gfs2_meta_inode_buffer(ip, &dibh);
1331 if (error)
1332 return error;
1333 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1334 gfs2_trans_add_meta(ip->i_gl, dibh);
1335 gfs2_dinode_out(ip, dibh->b_data);
1336 brelse(dibh);
1337 return 0;
1338}
1339
1340
1341/**
1342 * gfs2_rename - Rename a file
1343 * @odir: Parent directory of old file name
1344 * @odentry: The old dentry of the file
1345 * @ndir: Parent directory of new file name
1346 * @ndentry: The new dentry of the file
1347 *
1348 * Returns: errno
1349 */
1350
1351static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1352 struct inode *ndir, struct dentry *ndentry)
1353{
1354 struct gfs2_inode *odip = GFS2_I(odir);
1355 struct gfs2_inode *ndip = GFS2_I(ndir);
1356 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1357 struct gfs2_inode *nip = NULL;
1358 struct gfs2_sbd *sdp = GFS2_SB(odir);
1359 struct gfs2_holder ghs[5], r_gh;
1360 struct gfs2_rgrpd *nrgd;
1361 unsigned int num_gh;
1362 int dir_rename = 0;
1363 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1364 unsigned int x;
1365 int error;
1366
1367 gfs2_holder_mark_uninitialized(&r_gh);
1368 if (d_really_is_positive(ndentry)) {
1369 nip = GFS2_I(d_inode(ndentry));
1370 if (ip == nip)
1371 return 0;
1372 }
1373
1374 error = gfs2_rindex_update(sdp);
1375 if (error)
1376 return error;
1377
1378 error = gfs2_rsqa_alloc(ndip);
1379 if (error)
1380 return error;
1381
1382 if (odip != ndip) {
1383 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1384 0, &r_gh);
1385 if (error)
1386 goto out;
1387
1388 if (S_ISDIR(ip->i_inode.i_mode)) {
1389 dir_rename = 1;
1390 /* don't move a directory into its subdir */
1391 error = gfs2_ok_to_move(ip, ndip);
1392 if (error)
1393 goto out_gunlock_r;
1394 }
1395 }
1396
1397 num_gh = 1;
1398 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1399 if (odip != ndip) {
1400 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1401 num_gh++;
1402 }
1403 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1404 num_gh++;
1405
1406 if (nip) {
1407 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1408 num_gh++;
1409 /* grab the resource lock for unlink flag twiddling
1410 * this is the case of the target file already existing
1411 * so we unlink before doing the rename
1412 */
1413 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1414 if (nrgd)
1415 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1416 }
1417
1418 for (x = 0; x < num_gh; x++) {
1419 error = gfs2_glock_nq(ghs + x);
1420 if (error)
1421 goto out_gunlock;
1422 }
1423
1424 error = -ENOENT;
1425 if (ip->i_inode.i_nlink == 0)
1426 goto out_gunlock;
1427
1428 /* Check out the old directory */
1429
1430 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1431 if (error)
1432 goto out_gunlock;
1433
1434 /* Check out the new directory */
1435
1436 if (nip) {
1437 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1438 if (error)
1439 goto out_gunlock;
1440
1441 if (nip->i_inode.i_nlink == 0) {
1442 error = -EAGAIN;
1443 goto out_gunlock;
1444 }
1445
1446 if (S_ISDIR(nip->i_inode.i_mode)) {
1447 if (nip->i_entries < 2) {
1448 gfs2_consist_inode(nip);
1449 error = -EIO;
1450 goto out_gunlock;
1451 }
1452 if (nip->i_entries > 2) {
1453 error = -ENOTEMPTY;
1454 goto out_gunlock;
1455 }
1456 }
1457 } else {
1458 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1459 if (error)
1460 goto out_gunlock;
1461
1462 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1463 switch (error) {
1464 case -ENOENT:
1465 error = 0;
1466 break;
1467 case 0:
1468 error = -EEXIST;
1469 default:
1470 goto out_gunlock;
1471 };
1472
1473 if (odip != ndip) {
1474 if (!ndip->i_inode.i_nlink) {
1475 error = -ENOENT;
1476 goto out_gunlock;
1477 }
1478 if (ndip->i_entries == (u32)-1) {
1479 error = -EFBIG;
1480 goto out_gunlock;
1481 }
1482 if (S_ISDIR(ip->i_inode.i_mode) &&
1483 ndip->i_inode.i_nlink == (u32)-1) {
1484 error = -EMLINK;
1485 goto out_gunlock;
1486 }
1487 }
1488 }
1489
1490 /* Check out the dir to be renamed */
1491
1492 if (dir_rename) {
1493 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1494 if (error)
1495 goto out_gunlock;
1496 }
1497
1498 if (nip == NULL) {
1499 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1500 if (error)
1501 goto out_gunlock;
1502 }
1503
1504 if (da.nr_blocks) {
1505 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1506 error = gfs2_quota_lock_check(ndip, &ap);
1507 if (error)
1508 goto out_gunlock;
1509
1510 error = gfs2_inplace_reserve(ndip, &ap);
1511 if (error)
1512 goto out_gunlock_q;
1513
1514 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1515 4 * RES_LEAF + 4, 0);
1516 if (error)
1517 goto out_ipreserv;
1518 } else {
1519 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1520 5 * RES_LEAF + 4, 0);
1521 if (error)
1522 goto out_gunlock;
1523 }
1524
1525 /* Remove the target file, if it exists */
1526
1527 if (nip)
1528 error = gfs2_unlink_inode(ndip, ndentry);
1529
1530 error = update_moved_ino(ip, ndip, dir_rename);
1531 if (error)
1532 goto out_end_trans;
1533
1534 error = gfs2_dir_del(odip, odentry);
1535 if (error)
1536 goto out_end_trans;
1537
1538 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1539 if (error)
1540 goto out_end_trans;
1541
1542out_end_trans:
1543 gfs2_trans_end(sdp);
1544out_ipreserv:
1545 if (da.nr_blocks)
1546 gfs2_inplace_release(ndip);
1547out_gunlock_q:
1548 if (da.nr_blocks)
1549 gfs2_quota_unlock(ndip);
1550out_gunlock:
1551 gfs2_dir_no_add(&da);
1552 while (x--) {
1553 gfs2_glock_dq(ghs + x);
1554 gfs2_holder_uninit(ghs + x);
1555 }
1556out_gunlock_r:
1557 if (gfs2_holder_initialized(&r_gh))
1558 gfs2_glock_dq_uninit(&r_gh);
1559out:
1560 return error;
1561}
1562
1563/**
1564 * gfs2_exchange - exchange two files
1565 * @odir: Parent directory of old file name
1566 * @odentry: The old dentry of the file
1567 * @ndir: Parent directory of new file name
1568 * @ndentry: The new dentry of the file
1569 * @flags: The rename flags
1570 *
1571 * Returns: errno
1572 */
1573
1574static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1575 struct inode *ndir, struct dentry *ndentry,
1576 unsigned int flags)
1577{
1578 struct gfs2_inode *odip = GFS2_I(odir);
1579 struct gfs2_inode *ndip = GFS2_I(ndir);
1580 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1581 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1582 struct gfs2_sbd *sdp = GFS2_SB(odir);
1583 struct gfs2_holder ghs[5], r_gh;
1584 unsigned int num_gh;
1585 unsigned int x;
1586 umode_t old_mode = oip->i_inode.i_mode;
1587 umode_t new_mode = nip->i_inode.i_mode;
1588 int error;
1589
1590 gfs2_holder_mark_uninitialized(&r_gh);
1591 error = gfs2_rindex_update(sdp);
1592 if (error)
1593 return error;
1594
1595 if (odip != ndip) {
1596 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1597 0, &r_gh);
1598 if (error)
1599 goto out;
1600
1601 if (S_ISDIR(old_mode)) {
1602 /* don't move a directory into its subdir */
1603 error = gfs2_ok_to_move(oip, ndip);
1604 if (error)
1605 goto out_gunlock_r;
1606 }
1607
1608 if (S_ISDIR(new_mode)) {
1609 /* don't move a directory into its subdir */
1610 error = gfs2_ok_to_move(nip, odip);
1611 if (error)
1612 goto out_gunlock_r;
1613 }
1614 }
1615
1616 num_gh = 1;
1617 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1618 if (odip != ndip) {
1619 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1620 num_gh++;
1621 }
1622 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1623 num_gh++;
1624
1625 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1626 num_gh++;
1627
1628 for (x = 0; x < num_gh; x++) {
1629 error = gfs2_glock_nq(ghs + x);
1630 if (error)
1631 goto out_gunlock;
1632 }
1633
1634 error = -ENOENT;
1635 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1636 goto out_gunlock;
1637
1638 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1639 if (error)
1640 goto out_gunlock;
1641 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1642 if (error)
1643 goto out_gunlock;
1644
1645 if (S_ISDIR(old_mode)) {
1646 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1647 if (error)
1648 goto out_gunlock;
1649 }
1650 if (S_ISDIR(new_mode)) {
1651 error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1652 if (error)
1653 goto out_gunlock;
1654 }
1655 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1656 if (error)
1657 goto out_gunlock;
1658
1659 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1660 if (error)
1661 goto out_end_trans;
1662
1663 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1664 if (error)
1665 goto out_end_trans;
1666
1667 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1668 IF2DT(old_mode));
1669 if (error)
1670 goto out_end_trans;
1671
1672 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1673 IF2DT(new_mode));
1674 if (error)
1675 goto out_end_trans;
1676
1677 if (odip != ndip) {
1678 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1679 inc_nlink(&odip->i_inode);
1680 drop_nlink(&ndip->i_inode);
1681 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1682 inc_nlink(&ndip->i_inode);
1683 drop_nlink(&odip->i_inode);
1684 }
1685 }
1686 mark_inode_dirty(&ndip->i_inode);
1687 if (odip != ndip)
1688 mark_inode_dirty(&odip->i_inode);
1689
1690out_end_trans:
1691 gfs2_trans_end(sdp);
1692out_gunlock:
1693 while (x--) {
1694 gfs2_glock_dq(ghs + x);
1695 gfs2_holder_uninit(ghs + x);
1696 }
1697out_gunlock_r:
1698 if (gfs2_holder_initialized(&r_gh))
1699 gfs2_glock_dq_uninit(&r_gh);
1700out:
1701 return error;
1702}
1703
1704static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1705 struct inode *ndir, struct dentry *ndentry,
1706 unsigned int flags)
1707{
1708 flags &= ~RENAME_NOREPLACE;
1709
1710 if (flags & ~RENAME_EXCHANGE)
1711 return -EINVAL;
1712
1713 if (flags & RENAME_EXCHANGE)
1714 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1715
1716 return gfs2_rename(odir, odentry, ndir, ndentry);
1717}
1718
1719/**
1720 * gfs2_get_link - Follow a symbolic link
1721 * @dentry: The dentry of the link
1722 * @inode: The inode of the link
1723 * @done: destructor for return value
1724 *
1725 * This can handle symlinks of any size.
1726 *
1727 * Returns: 0 on success or error code
1728 */
1729
1730static const char *gfs2_get_link(struct dentry *dentry,
1731 struct inode *inode,
1732 struct delayed_call *done)
1733{
1734 struct gfs2_inode *ip = GFS2_I(inode);
1735 struct gfs2_holder i_gh;
1736 struct buffer_head *dibh;
1737 unsigned int size;
1738 char *buf;
1739 int error;
1740
1741 if (!dentry)
1742 return ERR_PTR(-ECHILD);
1743
1744 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1745 error = gfs2_glock_nq(&i_gh);
1746 if (error) {
1747 gfs2_holder_uninit(&i_gh);
1748 return ERR_PTR(error);
1749 }
1750
1751 size = (unsigned int)i_size_read(&ip->i_inode);
1752 if (size == 0) {
1753 gfs2_consist_inode(ip);
1754 buf = ERR_PTR(-EIO);
1755 goto out;
1756 }
1757
1758 error = gfs2_meta_inode_buffer(ip, &dibh);
1759 if (error) {
1760 buf = ERR_PTR(error);
1761 goto out;
1762 }
1763
1764 buf = kzalloc(size + 1, GFP_NOFS);
1765 if (!buf)
1766 buf = ERR_PTR(-ENOMEM);
1767 else
1768 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1769 brelse(dibh);
1770out:
1771 gfs2_glock_dq_uninit(&i_gh);
1772 if (!IS_ERR(buf))
1773 set_delayed_call(done, kfree_link, buf);
1774 return buf;
1775}
1776
1777/**
1778 * gfs2_permission -
1779 * @inode: The inode
1780 * @mask: The mask to be tested
1781 * @flags: Indicates whether this is an RCU path walk or not
1782 *
1783 * This may be called from the VFS directly, or from within GFS2 with the
1784 * inode locked, so we look to see if the glock is already locked and only
1785 * lock the glock if its not already been done.
1786 *
1787 * Returns: errno
1788 */
1789
1790int gfs2_permission(struct inode *inode, int mask)
1791{
1792 struct gfs2_inode *ip;
1793 struct gfs2_holder i_gh;
1794 int error;
1795
1796 gfs2_holder_mark_uninitialized(&i_gh);
1797 ip = GFS2_I(inode);
1798 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1799 if (mask & MAY_NOT_BLOCK)
1800 return -ECHILD;
1801 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1802 if (error)
1803 return error;
1804 }
1805
1806 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1807 error = -EPERM;
1808 else
1809 error = generic_permission(inode, mask);
1810 if (gfs2_holder_initialized(&i_gh))
1811 gfs2_glock_dq_uninit(&i_gh);
1812
1813 return error;
1814}
1815
1816static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1817{
1818 setattr_copy(inode, attr);
1819 mark_inode_dirty(inode);
1820 return 0;
1821}
1822
1823/**
1824 * gfs2_setattr_simple -
1825 * @ip:
1826 * @attr:
1827 *
1828 * Returns: errno
1829 */
1830
1831int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1832{
1833 int error;
1834
1835 if (current->journal_info)
1836 return __gfs2_setattr_simple(inode, attr);
1837
1838 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1839 if (error)
1840 return error;
1841
1842 error = __gfs2_setattr_simple(inode, attr);
1843 gfs2_trans_end(GFS2_SB(inode));
1844 return error;
1845}
1846
1847static int setattr_chown(struct inode *inode, struct iattr *attr)
1848{
1849 struct gfs2_inode *ip = GFS2_I(inode);
1850 struct gfs2_sbd *sdp = GFS2_SB(inode);
1851 kuid_t ouid, nuid;
1852 kgid_t ogid, ngid;
1853 int error;
1854 struct gfs2_alloc_parms ap;
1855
1856 ouid = inode->i_uid;
1857 ogid = inode->i_gid;
1858 nuid = attr->ia_uid;
1859 ngid = attr->ia_gid;
1860
1861 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1862 ouid = nuid = NO_UID_QUOTA_CHANGE;
1863 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1864 ogid = ngid = NO_GID_QUOTA_CHANGE;
1865
1866 error = gfs2_rsqa_alloc(ip);
1867 if (error)
1868 goto out;
1869
1870 error = gfs2_rindex_update(sdp);
1871 if (error)
1872 goto out;
1873
1874 error = gfs2_quota_lock(ip, nuid, ngid);
1875 if (error)
1876 goto out;
1877
1878 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1879
1880 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1881 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1882 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1883 if (error)
1884 goto out_gunlock_q;
1885 }
1886
1887 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1888 if (error)
1889 goto out_gunlock_q;
1890
1891 error = gfs2_setattr_simple(inode, attr);
1892 if (error)
1893 goto out_end_trans;
1894
1895 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1896 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1897 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1898 gfs2_quota_change(ip, ap.target, nuid, ngid);
1899 }
1900
1901out_end_trans:
1902 gfs2_trans_end(sdp);
1903out_gunlock_q:
1904 gfs2_quota_unlock(ip);
1905out:
1906 return error;
1907}
1908
1909/**
1910 * gfs2_setattr - Change attributes on an inode
1911 * @dentry: The dentry which is changing
1912 * @attr: The structure describing the change
1913 *
1914 * The VFS layer wants to change one or more of an inodes attributes. Write
1915 * that change out to disk.
1916 *
1917 * Returns: errno
1918 */
1919
1920static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1921{
1922 struct inode *inode = d_inode(dentry);
1923 struct gfs2_inode *ip = GFS2_I(inode);
1924 struct gfs2_holder i_gh;
1925 int error;
1926
1927 error = gfs2_rsqa_alloc(ip);
1928 if (error)
1929 return error;
1930
1931 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1932 if (error)
1933 return error;
1934
1935 error = -EPERM;
1936 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1937 goto out;
1938
1939 error = setattr_prepare(dentry, attr);
1940 if (error)
1941 goto out;
1942
1943 if (attr->ia_valid & ATTR_SIZE)
1944 error = gfs2_setattr_size(inode, attr->ia_size);
1945 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1946 error = setattr_chown(inode, attr);
1947 else {
1948 error = gfs2_setattr_simple(inode, attr);
1949 if (!error && attr->ia_valid & ATTR_MODE)
1950 error = posix_acl_chmod(inode, inode->i_mode);
1951 }
1952
1953out:
1954 if (!error)
1955 mark_inode_dirty(inode);
1956 gfs2_glock_dq_uninit(&i_gh);
1957 return error;
1958}
1959
1960/**
1961 * gfs2_getattr - Read out an inode's attributes
1962 * @mnt: The vfsmount the inode is being accessed from
1963 * @dentry: The dentry to stat
1964 * @stat: The inode's stats
1965 *
1966 * This may be called from the VFS directly, or from within GFS2 with the
1967 * inode locked, so we look to see if the glock is already locked and only
1968 * lock the glock if its not already been done. Note that its the NFS
1969 * readdirplus operation which causes this to be called (from filldir)
1970 * with the glock already held.
1971 *
1972 * Returns: errno
1973 */
1974
1975static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1976 struct kstat *stat)
1977{
1978 struct inode *inode = d_inode(dentry);
1979 struct gfs2_inode *ip = GFS2_I(inode);
1980 struct gfs2_holder gh;
1981 int error;
1982
1983 gfs2_holder_mark_uninitialized(&gh);
1984 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1985 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1986 if (error)
1987 return error;
1988 }
1989
1990 generic_fillattr(inode, stat);
1991 if (gfs2_holder_initialized(&gh))
1992 gfs2_glock_dq_uninit(&gh);
1993
1994 return 0;
1995}
1996
1997static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1998 u64 start, u64 len)
1999{
2000 struct gfs2_inode *ip = GFS2_I(inode);
2001 struct gfs2_holder gh;
2002 int ret;
2003
2004 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
2005 if (ret)
2006 return ret;
2007
2008 inode_lock(inode);
2009
2010 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2011 if (ret)
2012 goto out;
2013
2014 if (gfs2_is_stuffed(ip)) {
2015 u64 phys = ip->i_no_addr << inode->i_blkbits;
2016 u64 size = i_size_read(inode);
2017 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
2018 FIEMAP_EXTENT_DATA_INLINE;
2019 phys += sizeof(struct gfs2_dinode);
2020 phys += start;
2021 if (start + len > size)
2022 len = size - start;
2023 if (start < size)
2024 ret = fiemap_fill_next_extent(fieinfo, start, phys,
2025 len, flags);
2026 if (ret == 1)
2027 ret = 0;
2028 } else {
2029 ret = __generic_block_fiemap(inode, fieinfo, start, len,
2030 gfs2_block_map);
2031 }
2032
2033 gfs2_glock_dq_uninit(&gh);
2034out:
2035 inode_unlock(inode);
2036 return ret;
2037}
2038
2039const struct inode_operations gfs2_file_iops = {
2040 .permission = gfs2_permission,
2041 .setattr = gfs2_setattr,
2042 .getattr = gfs2_getattr,
2043 .listxattr = gfs2_listxattr,
2044 .fiemap = gfs2_fiemap,
2045 .get_acl = gfs2_get_acl,
2046 .set_acl = gfs2_set_acl,
2047};
2048
2049const struct inode_operations gfs2_dir_iops = {
2050 .create = gfs2_create,
2051 .lookup = gfs2_lookup,
2052 .link = gfs2_link,
2053 .unlink = gfs2_unlink,
2054 .symlink = gfs2_symlink,
2055 .mkdir = gfs2_mkdir,
2056 .rmdir = gfs2_unlink,
2057 .mknod = gfs2_mknod,
2058 .rename = gfs2_rename2,
2059 .permission = gfs2_permission,
2060 .setattr = gfs2_setattr,
2061 .getattr = gfs2_getattr,
2062 .listxattr = gfs2_listxattr,
2063 .fiemap = gfs2_fiemap,
2064 .get_acl = gfs2_get_acl,
2065 .set_acl = gfs2_set_acl,
2066 .atomic_open = gfs2_atomic_open,
2067};
2068
2069const struct inode_operations gfs2_symlink_iops = {
2070 .get_link = gfs2_get_link,
2071 .permission = gfs2_permission,
2072 .setattr = gfs2_setattr,
2073 .getattr = gfs2_getattr,
2074 .listxattr = gfs2_listxattr,
2075 .fiemap = gfs2_fiemap,
2076};
2077