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Btrfs: make defragment work with nodatacow option

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Btrfs defragment will utilize COW feature, which means this
did not work for nodatacow option, this problem was detected
by xfstests generic/018 with nodatacow mount option.

Fix this problem by forcing cow for a extent with state
@EXTETN_DEFRAG setting.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Wang Shilong
2014-07-03 18:22:07 +08:00
committed by Chris Mason
parent 48fcc3ff7d
commit 47059d930f
2 changed files with 42 additions and 3 deletions
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6
fs/btrfs/btrfs_inode.h
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@@ -120,6 +120,12 @@ struct btrfs_inode {
*/
u64 delalloc_bytes;
/*
* total number of bytes pending defrag, used by stat to check whether
* it needs COW.
*/
u64 defrag_bytes;
/*
* the size of the file stored in the metadata on disk. data=ordered
* means the in-memory i_size might be larger than the size on disk