git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| f2c870e3 TM |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
| 2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
| 3 | * | |
| 4 | * refcounttree.c | |
| 5 | * | |
| 6 | * Copyright (C) 2009 Oracle. All rights reserved. | |
| 7 | * | |
| 8 | * This program is free software; you can redistribute it and/or | |
| 9 | * modify it under the terms of the GNU General Public | |
| 10 | * License version 2 as published by the Free Software Foundation. | |
| 11 | * | |
| 12 | * This program is distributed in the hope that it will be useful, | |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 15 | * General Public License for more details. | |
| 16 | */ | |
| 17 | ||
| 18 | #define MLOG_MASK_PREFIX ML_REFCOUNT | |
| 19 | #include <cluster/masklog.h> | |
| 20 | #include "ocfs2.h" | |
| 21 | #include "inode.h" | |
| 22 | #include "alloc.h" | |
| 23 | #include "suballoc.h" | |
| 24 | #include "journal.h" | |
| 25 | #include "uptodate.h" | |
| 26 | #include "super.h" | |
| 27 | #include "buffer_head_io.h" | |
| 28 | #include "blockcheck.h" | |
| 29 | ||
| 30 | static int ocfs2_validate_refcount_block(struct super_block *sb, | |
| 31 | struct buffer_head *bh) | |
| 32 | { | |
| 33 | int rc; | |
| 34 | struct ocfs2_refcount_block *rb = | |
| 35 | (struct ocfs2_refcount_block *)bh->b_data; | |
| 36 | ||
| 37 | mlog(0, "Validating refcount block %llu\n", | |
| 38 | (unsigned long long)bh->b_blocknr); | |
| 39 | ||
| 40 | BUG_ON(!buffer_uptodate(bh)); | |
| 41 | ||
| 42 | /* | |
| 43 | * If the ecc fails, we return the error but otherwise | |
| 44 | * leave the filesystem running. We know any error is | |
| 45 | * local to this block. | |
| 46 | */ | |
| 47 | rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &rb->rf_check); | |
| 48 | if (rc) { | |
| 49 | mlog(ML_ERROR, "Checksum failed for refcount block %llu\n", | |
| 50 | (unsigned long long)bh->b_blocknr); | |
| 51 | return rc; | |
| 52 | } | |
| 53 | ||
| 54 | ||
| 55 | if (!OCFS2_IS_VALID_REFCOUNT_BLOCK(rb)) { | |
| 56 | ocfs2_error(sb, | |
| 57 | "Refcount block #%llu has bad signature %.*s", | |
| 58 | (unsigned long long)bh->b_blocknr, 7, | |
| 59 | rb->rf_signature); | |
| 60 | return -EINVAL; | |
| 61 | } | |
| 62 | ||
| 63 | if (le64_to_cpu(rb->rf_blkno) != bh->b_blocknr) { | |
| 64 | ocfs2_error(sb, | |
| 65 | "Refcount block #%llu has an invalid rf_blkno " | |
| 66 | "of %llu", | |
| 67 | (unsigned long long)bh->b_blocknr, | |
| 68 | (unsigned long long)le64_to_cpu(rb->rf_blkno)); | |
| 69 | return -EINVAL; | |
| 70 | } | |
| 71 | ||
| 72 | if (le32_to_cpu(rb->rf_fs_generation) != OCFS2_SB(sb)->fs_generation) { | |
| 73 | ocfs2_error(sb, | |
| 74 | "Refcount block #%llu has an invalid " | |
| 75 | "rf_fs_generation of #%u", | |
| 76 | (unsigned long long)bh->b_blocknr, | |
| 77 | le32_to_cpu(rb->rf_fs_generation)); | |
| 78 | return -EINVAL; | |
| 79 | } | |
| 80 | ||
| 81 | return 0; | |
| 82 | } | |
| 83 | ||
| 84 | static int ocfs2_read_refcount_block(struct ocfs2_caching_info *ci, | |
| 85 | u64 rb_blkno, | |
| 86 | struct buffer_head **bh) | |
| 87 | { | |
| 88 | int rc; | |
| 89 | struct buffer_head *tmp = *bh; | |
| 90 | ||
| 91 | rc = ocfs2_read_block(ci, rb_blkno, &tmp, | |
| 92 | ocfs2_validate_refcount_block); | |
| 93 | ||
| 94 | /* If ocfs2_read_block() got us a new bh, pass it up. */ | |
| 95 | if (!rc && !*bh) | |
| 96 | *bh = tmp; | |
| 97 | ||
| 98 | return rc; | |
| 99 | } |