Btrfs: Handle write errors on raid1 and raid10
When duplicate copies exist, writes are allowed to fail to one of those
copies. This changeset includes a few changes that allow the FS to
continue even when some IOs fail.
It also adds verification of the parent generation number for btree blocks.
This generation is stored in the pointer to a block, and it ensures
that missed writes to are detected.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/tree-defrag.c b/fs/btrfs/tree-defrag.c
index 5085e9e..c02e2bf 100644
--- a/fs/btrfs/tree-defrag.c
+++ b/fs/btrfs/tree-defrag.c
@@ -51,6 +51,7 @@
struct extent_buffer *next;
struct extent_buffer *cur;
u64 bytenr;
+ u64 ptr_gen;
int ret = 0;
int is_extent = 0;
@@ -93,11 +94,12 @@
break;
}
bytenr = btrfs_node_blockptr(cur, path->slots[*level]);
+ ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]);
if (cache_only) {
next = btrfs_find_tree_block(root, bytenr,
btrfs_level_size(root, *level - 1));
- if (!next || !btrfs_buffer_uptodate(next) ||
+ if (!next || !btrfs_buffer_uptodate(next, ptr_gen) ||
!btrfs_buffer_defrag(next)) {
free_extent_buffer(next);
path->slots[*level]++;
@@ -106,8 +108,7 @@
} else {
next = read_tree_block(root, bytenr,
btrfs_level_size(root, *level - 1),
- btrfs_node_ptr_generation(cur,
- path->slots[*level]));
+ ptr_gen);
}
ret = btrfs_cow_block(trans, root, next, path->nodes[*level],
path->slots[*level], &next);