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authorJan Schmidt <list.btrfs@jan-o-sch.net>2012-10-19 11:22:03 +0400
committerJan Schmidt <list.btrfs@jan-o-sch.net>2012-10-23 17:09:11 +0400
commit57911b8ba814fae01306376a0d02bc7cdc88dc94 (patch)
tree785127860e4b9bae2543ecf940cbec80d5de997d
parentf46dbe3dee853f8a860f889cb2b7ff4c624f2a7a (diff)
downloadlinux-57911b8ba814fae01306376a0d02bc7cdc88dc94.tar.xz
Btrfs: don't put removals from push_node_left into tree mod log twice
Independant of the check (push_items < src_items) tree_mod_log_eb_copy did log the removal of the old data entries from the source buffer. Therefore, we must not call tree_mod_log_eb_move if the check evaluates to true, as that would log the removal twice, finally resulting in (rewinded) buffers with wrong values for header_nritems. Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
-rw-r--r--fs/btrfs/ctree.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index b33436211000..44a7e25353a6 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -1225,6 +1225,8 @@ tree_mod_log_rewind(struct btrfs_fs_info *fs_info, struct extent_buffer *eb,
free_extent_buffer(eb);
__tree_mod_log_rewind(eb_rewin, time_seq, tm);
+ WARN_ON(btrfs_header_nritems(eb_rewin) >
+ BTRFS_NODEPTRS_PER_BLOCK(fs_info->fs_root));
return eb_rewin;
}
@@ -1280,6 +1282,7 @@ get_old_root(struct btrfs_root *root, u64 time_seq)
else
WARN_ON(btrfs_header_level(eb) != 0);
extent_buffer_get(eb);
+ WARN_ON(btrfs_header_nritems(eb) > BTRFS_NODEPTRS_PER_BLOCK(root));
return eb;
}
@@ -2970,8 +2973,10 @@ static int push_node_left(struct btrfs_trans_handle *trans,
push_items * sizeof(struct btrfs_key_ptr));
if (push_items < src_nritems) {
- tree_mod_log_eb_move(root->fs_info, src, 0, push_items,
- src_nritems - push_items);
+ /*
+ * don't call tree_mod_log_eb_move here, key removal was already
+ * fully logged by tree_mod_log_eb_copy above.
+ */
memmove_extent_buffer(src, btrfs_node_key_ptr_offset(0),
btrfs_node_key_ptr_offset(push_items),
(src_nritems - push_items) *