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/*
* Copyright (c) 2012-2015 Paulo Alcantara <pcacjr@zytor.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <cache.h>
#include <core.h>
#include <fs.h>
#include "xfs_types.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "misc.h"
#include "xfs.h"
#include "xfs_dinode.h"
xfs_dinode_t *xfs_dinode_get_core(struct fs_info *fs, xfs_ino_t ino)
{
block_t blk;
xfs_dinode_t *core;
uint64_t offset;
xfs_debug("fs %p ino %lu", fs, ino);
blk = ino_to_bytes(fs, ino) >> BLOCK_SHIFT(fs);
offset = XFS_INO_TO_OFFSET(XFS_INFO(fs), ino) << XFS_INFO(fs)->inode_shift;
if (offset > BLOCK_SIZE(fs)) {
xfs_error("Invalid inode offset in block!");
xfs_debug("offset: 0x%llx", offset);
goto out;
}
xfs_debug("blk %llu block offset 0x%llx", blk, blk << BLOCK_SHIFT(fs));
xfs_debug("inode offset in block (in bytes) is 0x%llx", offset);
core = (xfs_dinode_t *)((uint8_t *)get_cache(fs->fs_dev, blk) + offset);
if (be16_to_cpu(core->di_magic) !=
be16_to_cpu(*(uint16_t *)XFS_DINODE_MAGIC)) {
xfs_error("Inode core's magic number does not match!");
xfs_debug("magic number 0x%04x", (be16_to_cpu(core->di_magic)));
goto out;
}
return core;
out:
return NULL;
}
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