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Btrfs: do not defrag a file partially

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xfstests 218 complains that btrfs defrags a file partially:
 After: 1
 Write backwards sync, but contiguous - should defrag to 1 extent
 Before: 10
-After: 1
+After: 2

To fix this, we need to set max_to_defrag count properly.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Liu Bo 2012-01-26 15:01:12 -05:00 committed by Chris Mason
parent 0b485143d8
commit 7ec31b548a
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/ioctl.c
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@ -1066,7 +1066,7 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
i = range->start >> PAGE_CACHE_SHIFT;
}
if (!max_to_defrag)
max_to_defrag = last_index;
max_to_defrag = last_index + 1;
/*
* make writeback starts from i, so the defrag range can be