diff options
| author | Gui Hecheng <guihc.fnst@cn.fujitsu.com> | 2014-01-23 13:41:09 +0800 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2014-01-29 07:06:22 -0800 |
| commit | 3c9665df0c5d3f471b07efc32181459386678ebd (patch) | |
| tree | 3d3b424ce1afd463f0cb5115db180edb897c5fe6 /fs | |
| parent | 9f03740a956d7ac6a1b8f8c455da6fa5cae11c22 (diff) | |
| download | lwn-3c9665df0c5d3f471b07efc32181459386678ebd.tar.gz lwn-3c9665df0c5d3f471b07efc32181459386678ebd.zip | |
btrfs: fix warning while merging two adjacent extents
When we have two adjacent extents in relink_extent_backref,
we try to merge them. When we use btrfs_search_slot to locate the
slot for the current extent, we shouldn't set "ins_len = 1",
because we will merge it into the previous extent rather than
insert a new item. Otherwise, we may happen to create a new leaf
in btrfs_search_slot and path->slot[0] will be 0. Then we try to
fetch the previous item using "path->slots[0]--", and it will cause
a warning as follows:
[ 145.713385] WARNING: CPU: 3 PID: 1796 at fs/btrfs/extent_io.c:5043 map_private_extent_buffer+0xd4/0xe0
[ 145.713387] btrfs bad mapping eb start 5337088 len 4096, wanted 167772306 8
...
[ 145.713462] [<ffffffffa034b1f4>] map_private_extent_buffer+0xd4/0xe0
[ 145.713476] [<ffffffffa030097a>] ? btrfs_free_path+0x2a/0x40
[ 145.713485] [<ffffffffa0340864>] btrfs_get_token_64+0x64/0xf0
[ 145.713498] [<ffffffffa033472c>] relink_extent_backref+0x41c/0x820
[ 145.713508] [<ffffffffa0334d69>] btrfs_finish_ordered_io+0x239/0xa80
I encounter this warning when running defrag having mkfs.btrfs
with option -M. At the same time there are read/writes & snapshots
running at background.
Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/inode.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 7b61ea3141e5..3b6598783be9 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -2314,7 +2314,7 @@ again: u64 extent_len; struct btrfs_key found_key; - ret = btrfs_search_slot(trans, root, &key, path, 1, 1); + ret = btrfs_search_slot(trans, root, &key, path, 0, 1); if (ret < 0) goto out_free_path; |