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Btrfs: memset to avoid stale content in btree leaf

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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>
This commit is contained in:
Liu Bo
2016-09-23 13:44:44 -07:00
committed by David Sterba
parent 0f5053eb90
commit 851cd173f0
3 changed files with 28 additions and 19 deletions
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14
fs/btrfs/ctree.c
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@@ -1715,20 +1715,6 @@ int btrfs_realloc_node(struct btrfs_trans_handle *trans,
return err;
}
/*
* 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);
}
/*
* search for key in the extent_buffer. The items start at offset p,