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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: Li Zefan <lizf@cn.fujitsu.com>
hifive-unleashed-5.1
Li Zefan 2011-09-02 15:56:55 +08:00 committed by David Sterba
parent 151a31b25e
commit 5ca496604b
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/ioctl.c
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@ -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) {
/*