diff options
| author | Tao Ma <boyu.mt@taobao.com> | 2011-08-13 12:30:59 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-08-29 13:29:11 -0700 |
| commit | 4eddd2a50f2548c6c83081fde8fdbc3de07626f6 (patch) | |
| tree | 2adb177da1b18471c528e5821850b6d5233f8501 /virt/kvm/coalesced_mmio.h | |
| parent | 2526f368949bccda6e8ed1bf74a4e955e3af42af (diff) | |
ext4: Resolve the hang of direct i/o read in handling EXT4_IO_END_UNWRITTEN.
commit 32c80b32c053dc52712dedac5e4d0aa7c93fc353 upstream.
EXT4_IO_END_UNWRITTEN flag set and the increase of i_aiodio_unwritten
should be done simultaneously since ext4_end_io_nolock always clear
the flag and decrease the counter in the same time.
We don't increase i_aiodio_unwritten when setting
EXT4_IO_END_UNWRITTEN so it will go nagative and causes some process
to wait forever.
Part of the patch came from Eric in his e-mail, but it doesn't fix the
problem met by Michael actually.
http://marc.info/?l=linux-ext4&m=131316851417460&w=2
Reported-and-Tested-by: Michael Tokarev<mjt@tls.msk.ru>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'virt/kvm/coalesced_mmio.h')
0 files changed, 0 insertions, 0 deletions