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authorYan Zheng <zheng.yan@oracle.com>2008-10-29 14:49:05 -0400
committerChris Mason <chris.mason@oracle.com>2008-10-29 14:49:05 -0400
commit84234f3a1f7c532e4afeba03cc8e7e4a8a5277ea (patch)
treec41f249b448f28b648b21c3898d0763b9c67ca6a /fs/btrfs/tree-log.c
parent2517920135b0d29e70453e5b03d70d7b94207df3 (diff)
Btrfs: Add root tree pointer transaction ids
This patch adds transaction IDs to root tree pointers. Transaction IDs in tree pointers are compared with the generation numbers in block headers when reading root blocks of trees. This can detect some types of IO errors. Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Diffstat (limited to 'fs/btrfs/tree-log.c')
-rw-r--r--fs/btrfs/tree-log.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 835daed5561..e0201c3a7dc 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -117,6 +117,7 @@ int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
btrfs_set_root_bytenr(&root_item, leaf->start);
+ btrfs_set_root_generation(&root_item, trans->transid);
btrfs_set_root_level(&root_item, 0);
btrfs_set_root_refs(&root_item, 0);
btrfs_set_root_used(&root_item, 0);
@@ -2065,6 +2066,7 @@ static int update_log_root(struct btrfs_trans_handle *trans,
return 0;
btrfs_set_root_bytenr(&log->root_item, log->node->start);
+ btrfs_set_root_generation(&log->root_item, trans->transid);
btrfs_set_root_level(&log->root_item, btrfs_header_level(log->node));
ret = btrfs_update_root(trans, log->fs_info->log_root_tree,
&log->root_key, &log->root_item);