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| author | Jan Schmidt <list.btrfs@jan-o-sch.net> | 2012-10-19 11:22:03 +0400 |
|---|---|---|
| committer | Jan Schmidt <list.btrfs@jan-o-sch.net> | 2012-10-23 17:09:11 +0400 |
| commit | 57911b8ba814fae01306376a0d02bc7cdc88dc94 (patch) | |
| tree | 785127860e4b9bae2543ecf940cbec80d5de997d /fs/btrfs/ctree.c | |
| parent | f46dbe3dee853f8a860f889cb2b7ff4c624f2a7a (diff) | |
| download | linux-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>
Diffstat (limited to 'fs/btrfs/ctree.c')
| -rw-r--r-- | fs/btrfs/ctree.c | 9 |
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) * |