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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/disk-io.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/disk-io.c')
-rw-r--r--fs/btrfs/disk-io.c21
1 files changed, 14 insertions, 7 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index d1137d7ea8d..94b4e50f6b2 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -832,6 +832,7 @@ static int find_and_setup_root(struct btrfs_root *tree_root,
{
int ret;
u32 blocksize;
+ u64 generation;
__setup_root(tree_root->nodesize, tree_root->leafsize,
tree_root->sectorsize, tree_root->stripesize,
@@ -840,9 +841,10 @@ static int find_and_setup_root(struct btrfs_root *tree_root,
&root->root_item, &root->root_key);
BUG_ON(ret);
+ generation = btrfs_root_generation(&root->root_item);
blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
- blocksize, 0);
+ blocksize, generation);
BUG_ON(!root->node);
return 0;
}
@@ -929,6 +931,7 @@ struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
struct btrfs_path *path;
struct extent_buffer *l;
u64 highest_inode;
+ u64 generation;
u32 blocksize;
int ret = 0;
@@ -970,9 +973,10 @@ out:
kfree(root);
return ERR_PTR(ret);
}
+ generation = btrfs_root_generation(&root->root_item);
blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
- blocksize, 0);
+ blocksize, generation);
BUG_ON(!root->node);
insert:
if (location->objectid != BTRFS_TREE_LOG_OBJECTID) {
@@ -1357,6 +1361,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
u32 leafsize;
u32 blocksize;
u32 stripesize;
+ u64 generation;
struct buffer_head *bh;
struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root),
GFP_NOFS);
@@ -1596,13 +1601,14 @@ struct btrfs_root *open_ctree(struct super_block *sb,
blocksize = btrfs_level_size(tree_root,
btrfs_super_chunk_root_level(disk_super));
+ generation = btrfs_super_chunk_root_generation(disk_super);
__setup_root(nodesize, leafsize, sectorsize, stripesize,
chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
chunk_root->node = read_tree_block(chunk_root,
btrfs_super_chunk_root(disk_super),
- blocksize, 0);
+ blocksize, generation);
BUG_ON(!chunk_root->node);
read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
@@ -1618,11 +1624,11 @@ struct btrfs_root *open_ctree(struct super_block *sb,
blocksize = btrfs_level_size(tree_root,
btrfs_super_root_level(disk_super));
-
+ generation = btrfs_super_generation(disk_super);
tree_root->node = read_tree_block(tree_root,
btrfs_super_root(disk_super),
- blocksize, 0);
+ blocksize, generation);
if (!tree_root->node)
goto fail_sb_buffer;
@@ -1672,15 +1678,16 @@ struct btrfs_root *open_ctree(struct super_block *sb,
log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
log_tree_root->node = read_tree_block(tree_root, bytenr,
- blocksize, 0);
+ blocksize,
+ generation + 1);
ret = btrfs_recover_log_trees(log_tree_root);
BUG_ON(ret);
}
+ fs_info->last_trans_committed = btrfs_super_generation(disk_super);
ret = btrfs_cleanup_reloc_trees(tree_root);
BUG_ON(ret);
- fs_info->last_trans_committed = btrfs_super_generation(disk_super);
return tree_root;
fail_cleaner: