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[PATCH 08/10] Btrfs: update to the right index of defragment

When we use autodefrag, we forget to update the index which indicates
the last page we've dirty.  And we'll set dirty flags on a same set of
pages again and again.

Signed-off-by: Liu Bo <liubo2009@xxxxxxxxxxxxxx>
 fs/btrfs/ioctl.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 7a6d15c..e3cb770 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1172,6 +1172,9 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
 			if (newer_off == (u64)-1)
+			if (ret > 0)
+				i += ret;
 			newer_off = max(newer_off + 1,
 					(u64)i << PAGE_CACHE_SHIFT);

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