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GFS2: Remove potential race in flock code

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This patch ensures that we always wait for glock demotion when
dropping flocks on a file in order to prevent any race
conditions associated with further flock calls or closing
the file.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Steven Whitehouse 2011-03-09 11:14:32 +00:00
parent fc0e38dae6
commit 0a33443b38
1 changed files with 4 additions and 2 deletions
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6
fs/gfs2/file.c
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@ -981,8 +981,10 @@ static void do_unflock(struct file *file, struct file_lock *fl)
mutex_lock(&fp->f_fl_mutex);
flock_lock_file_wait(file, fl);
if (fl_gh->gh_gl)
gfs2_glock_dq_uninit(fl_gh);
if (fl_gh->gh_gl) {
gfs2_glock_dq_wait(fl_gh);
gfs2_holder_uninit(fl_gh);
}
mutex_unlock(&fp->f_fl_mutex);
}