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, 2 insertions, 2 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index db07dde4a870..605018c6045c 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1366,7 +1366,7 @@ static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes,
         if (!pending) {
                 buf = btrfs_find_tree_block(root, bytenr, num_bytes);
                 if (buf) {
-                        if (btrfs_buffer_uptodate(buf)) {
+                        if (btrfs_buffer_uptodate(buf, 0)) {
                                 u64 transid =
                                     root->fs_info->running_transaction->transid;
                                 u64 header_transid =
@@ -2151,7 +2151,7 @@ static int noinline walk_down_tree(struct btrfs_trans_handle *trans,
                         continue;
                 }
                 next = btrfs_find_tree_block(root, bytenr, blocksize);
-                if (!next || !btrfs_buffer_uptodate(next)) {
+                if (!next || !btrfs_buffer_uptodate(next, ptr_gen)) {
                         free_extent_buffer(next);
                         reada_walk_down(root, cur, path->slots[*level]);