62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/*
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* Copyright (c) 2012-2013 Paulo Alcantara <pcacjr@zytor.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <cache.h>
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#include <core.h>
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#include <fs.h>
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#include "xfs_types.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "misc.h"
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#include "xfs.h"
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#include "xfs_dinode.h"
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xfs_dinode_t *xfs_dinode_get_core(struct fs_info *fs, xfs_ino_t ino)
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{
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block_t blk;
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xfs_dinode_t *core;
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uint64_t offset;
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xfs_debug("fs %p ino %lu", fs, ino);
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blk = ino_to_bytes(fs, ino) >> BLOCK_SHIFT(fs);
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offset = XFS_INO_TO_OFFSET(XFS_INFO(fs), ino) << XFS_INFO(fs)->inode_shift;
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if (offset > BLOCK_SIZE(fs)) {
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xfs_error("Invalid inode offset in block!");
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xfs_debug("offset: 0x%llx", offset);
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goto out;
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}
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xfs_debug("blk %llu block offset 0x%llx", blk, blk << BLOCK_SHIFT(fs));
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xfs_debug("inode offset in block (in bytes) is 0x%llx", offset);
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core = (xfs_dinode_t *)((uint8_t *)get_cache(fs->fs_dev, blk) + offset);
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if (be16_to_cpu(core->di_magic) !=
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be16_to_cpu(*(uint16_t *)XFS_DINODE_MAGIC)) {
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xfs_error("Inode core's magic number does not match!");
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xfs_debug("magic number 0x%04x", (be16_to_cpu(core->di_magic)));
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goto out;
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}
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return core;
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out:
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return NULL;
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}
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