diff options
| author |   Jan Kara <jack@suse.cz> | 2011-05-08 19:09:53 -0400 |
|---|---|---|
| committer |   Theodore Ts'o <tytso@mit.edu> | 2011-05-08 19:09:53 -0400 |
| commit | 229309caebe4508d650bb6d8f7d51f2b116f5bbd (patch) | |
| tree | 6b9612369cac17205b21ca0b4d93ebbd25863f6d /include | |
| parent | ext4: reimplement convert and split_unwritten (diff) | |
jbd2: Fix forever sleeping process in do_get_write_access()
In do_get_write_access() we wait on BH_Unshadow bit for buffer to get
from shadow state. The waking code in journal_commit_transaction() has
a bug because it does not issue a memory barrier after the buffer is
moved from the shadow state and before wake_up_bit() is called. Thus a
waitqueue check can happen before the buffer is actually moved from
the shadow state and waiting process may never be woken. Fix the
problem by issuing proper barrier.
Reported-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions