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GFS2: Allow flocks to use normal glock dq rather than dq_wait

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This patch allows flock glocks to use a non-blocking dequeue rather
than dq_wait. It also reverts the previous patch I had posted regarding
dq_wait. The reverted patch isn't necessarily a bad idea, but I decided
this might avoid unforeseen side effects, and was therefore safer.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Bob Peterson 2014-06-26 10:46:25 -04:00 committed by Steven Whitehouse
parent 6ec43b1838
commit 5bef3e7cf1
2 changed files with 2 additions and 4 deletions
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2
fs/gfs2/file.c
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@ -991,7 +991,7 @@ static int do_flock(struct file *file, int cmd, struct file_lock *fl)
goto out;
flock_lock_file_wait(file,
&(struct file_lock){.fl_type = F_UNLCK});
gfs2_glock_dq_wait(fl_gh);
gfs2_glock_dq(fl_gh);
gfs2_holder_reinit(state, flags, fl_gh);
} else {
error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,

4
fs/gfs2/glock.c
View file

@ -1128,9 +1128,7 @@ void gfs2_glock_dq_wait(struct gfs2_holder *gh)
struct gfs2_glock *gl = gh->gh_gl;
gfs2_glock_dq(gh);
might_sleep();
if (!find_first_holder(gl))
wait_on_bit(&gl->gl_flags, GLF_DEMOTE, gfs2_glock_demote_wait,
TASK_UNINTERRUPTIBLE);
wait_on_bit(&gl->gl_flags, GLF_DEMOTE, gfs2_glock_demote_wait, TASK_UNINTERRUPTIBLE);
}
/**