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| author | Yan Zheng <zheng.yan@oracle.com> | 2009-01-05 21:43:42 +0100 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2009-01-05 21:43:42 +0100 |
| commit | 2d69a0f88459fae35df3ddef4934a2dad67e2765 (patch) | |
| tree | 20901742766992c0b1a00e56c5c5535daa8be35b | |
| parent | Btrfs: do not call kfree if kmalloc failed in btrfs_sysfs_add_super (diff) | |
| download | linux-2d69a0f88459fae35df3ddef4934a2dad67e2765.tar.xz linux-2d69a0f88459fae35df3ddef4934a2dad67e2765.zip | |
Btrfs: avoid potential super block corruption
The data in fs_info->super_for_commit are zeros before the
first transaction commit. If tree log sync and system crash
both occur before the first transaction commit, super block
will get corrupted.
This fixes it by properly filling in the super_for_commit field at
open time.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
| -rw-r--r-- | fs/btrfs/disk-io.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 40a540f31161..dae25e78a6b7 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1609,6 +1609,8 @@ struct btrfs_root *open_ctree(struct super_block *sb, goto fail_iput; memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy)); + memcpy(&fs_info->super_for_commit, &fs_info->super_copy, + sizeof(fs_info->super_for_commit)); brelse(bh); memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE); @@ -1790,7 +1792,7 @@ struct btrfs_root *open_ctree(struct super_block *sb, btrfs_read_block_groups(extent_root); - fs_info->generation = generation + 1; + fs_info->generation = generation; fs_info->last_trans_committed = generation; fs_info->data_alloc_profile = (u64)-1; fs_info->metadata_alloc_profile = (u64)-1; |