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| author | Liu Bo | 2016-09-23 22:44:44 +0200 |
|---|---|---|
| committer | David Sterba | 2016-09-26 19:37:06 +0200 |
| commit | 851cd173f06045816528176001cf82948282029c (patch) | |
| tree | 280bf393ed2e9f10130fd8eea3bc08e3c601d083 /fs/btrfs/ctree.h | |
| parent | btrfs: parent_start initialization cleanup (diff) | |
| download | kernel-qcow2-linux-851cd173f06045816528176001cf82948282029c.tar.gz kernel-qcow2-linux-851cd173f06045816528176001cf82948282029c.tar.xz kernel-qcow2-linux-851cd173f06045816528176001cf82948282029c.zip | |
Btrfs: memset to avoid stale content in btree leaf
This is an additional patch to
"Btrfs: memset to avoid stale content in btree node block".
This uses memset to initialize the unused space in a leaf to avoid
potential stale content, which may be incurred by pushing items
between sibling leaves.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/ctree.h')
| -rw-r--r-- | fs/btrfs/ctree.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index cb0ae90649c0..5f1408b43e48 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -2293,6 +2293,21 @@ static inline unsigned long btrfs_leaf_data(struct extent_buffer *l) return offsetof(struct btrfs_leaf, items); } +/* + * The leaf data grows from end-to-front in the node. + * this returns the address of the start of the last item, + * which is the stop of the leaf data stack + */ +static inline unsigned int leaf_data_end(struct btrfs_root *root, + struct extent_buffer *leaf) +{ + u32 nr = btrfs_header_nritems(leaf); + + if (nr == 0) + return BTRFS_LEAF_DATA_SIZE(root); + return btrfs_item_offset_nr(leaf, nr - 1); +} + /* struct btrfs_file_extent_item */ BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8); BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr, |