| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * inode.c |
| 3 | * |
| 4 | * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com> |
| 5 | */ |
| 6 | |
| 7 | #include <linux/fs.h> |
| 8 | |
| 9 | #include "befs.h" |
| 10 | #include "inode.h" |
| 11 | #include "endian.h" |
| 12 | |
| 13 | /* |
| 14 | Validates the correctness of the befs inode |
| 15 | Returns BEFS_OK if the inode should be used, otherwise |
| 16 | returns BEFS_BAD_INODE |
| 17 | */ |
| 18 | int |
| 19 | befs_check_inode(struct super_block *sb, befs_inode * raw_inode, |
| 20 | befs_blocknr_t inode) |
| 21 | { |
| 22 | u32 magic1 = fs32_to_cpu(sb, raw_inode->magic1); |
| 23 | befs_inode_addr ino_num = fsrun_to_cpu(sb, raw_inode->inode_num); |
| 24 | u32 flags = fs32_to_cpu(sb, raw_inode->flags); |
| 25 | |
| 26 | /* check magic header. */ |
| 27 | if (magic1 != BEFS_INODE_MAGIC1) { |
| 28 | befs_error(sb, |
| 29 | "Inode has a bad magic header - inode = %lu", inode); |
| 30 | return BEFS_BAD_INODE; |
| 31 | } |
| 32 | |
| 33 | /* |
| 34 | * Sanity check2: inodes store their own block address. Check it. |
| 35 | */ |
| 36 | if (inode != iaddr2blockno(sb, &ino_num)) { |
| 37 | befs_error(sb, "inode blocknr field disagrees with vfs " |
| 38 | "VFS: %lu, Inode %lu", |
| 39 | inode, iaddr2blockno(sb, &ino_num)); |
| 40 | return BEFS_BAD_INODE; |
| 41 | } |
| 42 | |
| 43 | /* |
| 44 | * check flag |
| 45 | */ |
| 46 | |
| 47 | if (!(flags & BEFS_INODE_IN_USE)) { |
| 48 | befs_error(sb, "inode is not used - inode = %lu", inode); |
| 49 | return BEFS_BAD_INODE; |
| 50 | } |
| 51 | |
| 52 | return BEFS_OK; |
| 53 | } |