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Commit 5ca49660 authored by Li Zefan's avatar Li Zefan Committed by David Sterba
Browse files

Btrfs: fix wrong max_to_defrag in btrfs_defrag_file() 



It's off-by-one, and thus we may skip the last page while defragmenting.

An example case:

  # create /mnt/file with 2 4K file extents
  # btrfs fi defrag /mnt/file
  # sync
  # filefrag /mnt/file
  /mnt/file: 2 extents found

So it's not defragmented.

Signed-off-by: default avatarLi Zefan <lizf@cn.fujitsu.com>
parent 151a31b2

fs/btrfs/ioctl.c

+1 −1
Original line number Diff line number Diff line
@@ -1052,7 +1052,7 @@ 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 - 1;

		max_to_defrag = last_index;



	while (i <= last_index && defrag_count < max_to_defrag) {

		/*