tree a57eaec0eb40c490254af749c2bda77534002e9e
parent 560f7d75457f86a43970aa413e334e394082dce4
author Li Zefan <lizf@cn.fujitsu.com> 1315448811 +0800
committer David Sterba <dsterba@suse.cz> 1319127044 +0200

Btrfs: fix direct-io vs nodatacow

To reproduce the bug:

  # mount -o nodatacow /dev/sda7 /mnt/
  # dd if=/dev/zero of=/mnt/tmp bs=4K count=1
  1+0 records in
  1+0 records out
  4096 bytes (4.1 kB) copied, 0.000136115 s, 30.1 MB/s
  # dd if=/dev/zero of=/mnt/tmp bs=4K count=1 conv=notrunc oflag=direct
  dd: writing `/mnt/tmp': Input/output error
  1+0 records in
  0+0 records out

btrfs_ordered_update_i_size() may return 1, but btrfs_endio_direct_write()
mistakenly takes it as an error.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>