1 /*
2 * Copyright (c) 2012-2013 Paulo Alcantara <pcacjr@zytor.com>
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write the Free Software Foundation,
15 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
16 */
17
18 #include <cache.h>
19 #include <core.h>
20 #include <fs.h>
21
22 #include "xfs_types.h"
23 #include "xfs_sb.h"
24 #include "xfs_ag.h"
25 #include "misc.h"
26 #include "xfs.h"
27
28 #include "xfs_dinode.h"
29
xfs_dinode_get_core(struct fs_info * fs,xfs_ino_t ino)30 xfs_dinode_t *xfs_dinode_get_core(struct fs_info *fs, xfs_ino_t ino)
31 {
32 block_t blk;
33 xfs_dinode_t *core;
34 uint64_t offset;
35
36 xfs_debug("fs %p ino %lu", fs, ino);
37
38 blk = ino_to_bytes(fs, ino) >> BLOCK_SHIFT(fs);
39 offset = XFS_INO_TO_OFFSET(XFS_INFO(fs), ino) << XFS_INFO(fs)->inode_shift;
40 if (offset > BLOCK_SIZE(fs)) {
41 xfs_error("Invalid inode offset in block!");
42 xfs_debug("offset: 0x%llx", offset);
43 goto out;
44 }
45
46 xfs_debug("blk %llu block offset 0x%llx", blk, blk << BLOCK_SHIFT(fs));
47 xfs_debug("inode offset in block (in bytes) is 0x%llx", offset);
48
49 core = (xfs_dinode_t *)((uint8_t *)get_cache(fs->fs_dev, blk) + offset);
50 if (be16_to_cpu(core->di_magic) !=
51 be16_to_cpu(*(uint16_t *)XFS_DINODE_MAGIC)) {
52 xfs_error("Inode core's magic number does not match!");
53 xfs_debug("magic number 0x%04x", (be16_to_cpu(core->di_magic)));
54 goto out;
55 }
56
57 return core;
58
59 out:
60 return NULL;
61 }
62