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authorYan Zheng <zheng.yan@oracle.com>2008-11-10 07:34:43 -0500
committerChris Mason <chris.mason@oracle.com>2008-11-10 07:34:43 -0500
commitff5b7ee33d82414bf4baf299c21fb703bcc89629 (patch)
tree926786cf57b375e5ef1f865427c910c3d4bdfc7a /fs/btrfs/file.c
parentf2b1c41cf94d7f839fe9ede5f3ead92698a93fb3 (diff)
downloadop-kernel-dev-ff5b7ee33d82414bf4baf299c21fb703bcc89629.zip
op-kernel-dev-ff5b7ee33d82414bf4baf299c21fb703bcc89629.tar.gz
Btrfs: Fix csum error for compressed data
The decompress code doesn't take the logical offset in extent pointer into account. If the logical offset isn't zero, data will be decompressed into wrong pages. The solution used here is to record the starting offset of the extent in the file separately from the logical start of the extent_map struct. This allows us to avoid problems inserting overlapping extents. Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Diffstat (limited to 'fs/btrfs/file.c')
-rw-r--r--fs/btrfs/file.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 337221e..85841c5 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -222,6 +222,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
em->start < start) {
split->start = em->start;
split->len = start - em->start;
+ split->orig_start = em->orig_start;
split->block_start = em->block_start;
if (compressed)
@@ -243,6 +244,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
split->start = start + len;
split->len = em->start + em->len - (start + len);
+ split->orig_start = em->orig_start;
split->bdev = em->bdev;
split->flags = flags;
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