1 /* 2 * Copyright (c) 2012-2013 Paulo Alcantara <pcacjr (at) 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 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
