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authorYan Zheng <zheng.yan@oracle.com>2008-12-12 10:03:38 -0500
committerChris Mason <chris.mason@oracle.com>2008-12-12 10:03:38 -0500
commit17d217fe970d34720f4f1633dca73a6aa2f3d9d1 (patch)
tree4e2e716400cc45a6697475629f4c046b96ff76e7 /fs/btrfs/extent_io.h
parente4404d6e8da678d852b7f767f665f8edf76c9e9f (diff)
Btrfs: fix nodatasum handling in balancing code
Checksums on data can be disabled by mount option, so it's possible some data extents don't have checksums or have invalid checksums. This causes trouble for data relocation. This patch contains following things to make data relocation work. 1) make nodatasum/nodatacow mount option only affects new files. Checksums and COW on data are only controlled by the inode flags. 2) check the existence of checksum in the nodatacow checker. If checksums exist, force COW the data extent. This ensure that checksum for a given block is either valid or does not exist. 3) update data relocation code to properly handle the case of checksum missing. Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Diffstat (limited to 'fs/btrfs/extent_io.h')
-rw-r--r--fs/btrfs/extent_io.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 2d5f67065b6..c5b483a7913 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -16,6 +16,7 @@
#define EXTENT_ORDERED (1 << 9)
#define EXTENT_ORDERED_METADATA (1 << 10)
#define EXTENT_BOUNDARY (1 << 11)
+#define EXTENT_NODATASUM (1 << 12)
#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
/* flags for bio submission */