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>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 289d71d8653..02e571e6ee6 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -379,7 +379,7 @@ int btrfs_realloc_node(struct btrfs_trans_handle *trans,
 
                 cur = btrfs_find_tree_block(root, blocknr, blocksize);
                 if (cur)
-                        uptodate = btrfs_buffer_uptodate(cur);
+                        uptodate = btrfs_buffer_uptodate(cur, gen);
                 else
                         uptodate = 0;
                 if (!cur || !uptodate) {