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path: root/fs/gfs2/glock.c
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Diffstat (limited to 'fs/gfs2/glock.c')
-rw-r--r--fs/gfs2/glock.c26
1 files changed, 12 insertions, 14 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 173e59ce9ad3..ad8e121427c0 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -167,6 +167,7 @@ static void glock_free(struct gfs2_glock *gl)
static void gfs2_glock_hold(struct gfs2_glock *gl)
{
+ GLOCK_BUG_ON(gl, atomic_read(&gl->gl_ref) == 0);
atomic_inc(&gl->gl_ref);
}
@@ -206,16 +207,15 @@ int gfs2_glock_put(struct gfs2_glock *gl)
atomic_dec(&lru_count);
}
spin_unlock(&lru_lock);
- GLOCK_BUG_ON(gl, !list_empty(&gl->gl_lru));
GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders));
glock_free(gl);
rv = 1;
goto out;
}
- write_unlock(gl_lock_addr(gl->gl_hash));
/* 1 for being hashed, 1 for having state != LM_ST_UNLOCKED */
if (atomic_read(&gl->gl_ref) == 2)
gfs2_glock_schedule_for_reclaim(gl);
+ write_unlock(gl_lock_addr(gl->gl_hash));
out:
return rv;
}
@@ -597,10 +597,11 @@ __acquires(&gl->gl_spin)
GLOCK_BUG_ON(gl, test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags));
+ down_read(&gfs2_umount_flush_sem);
if (test_bit(GLF_DEMOTE, &gl->gl_flags) &&
gl->gl_demote_state != gl->gl_state) {
if (find_first_holder(gl))
- goto out;
+ goto out_unlock;
if (nonblock)
goto out_sched;
set_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags);
@@ -611,23 +612,26 @@ __acquires(&gl->gl_spin)
gfs2_demote_wake(gl);
ret = do_promote(gl);
if (ret == 0)
- goto out;
+ goto out_unlock;
if (ret == 2)
- return;
+ goto out_sem;
gh = find_first_waiter(gl);
gl->gl_target = gh->gh_state;
if (!(gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)))
do_error(gl, 0); /* Fail queued try locks */
}
do_xmote(gl, gh, gl->gl_target);
+out_sem:
+ up_read(&gfs2_umount_flush_sem);
return;
out_sched:
gfs2_glock_hold(gl);
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
gfs2_glock_put(gl);
-out:
+out_unlock:
clear_bit(GLF_LOCK, &gl->gl_flags);
+ goto out_sem;
}
static void glock_work_func(struct work_struct *work)
@@ -1225,7 +1229,6 @@ void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state)
void gfs2_glock_complete(struct gfs2_glock *gl, int ret)
{
struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct;
- down_read(&gfs2_umount_flush_sem);
gl->gl_reply = ret;
if (unlikely(test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags))) {
struct gfs2_holder *gh;
@@ -1236,16 +1239,13 @@ void gfs2_glock_complete(struct gfs2_glock *gl, int ret)
((ret & ~LM_OUT_ST_MASK) != 0))
set_bit(GLF_FROZEN, &gl->gl_flags);
spin_unlock(&gl->gl_spin);
- if (test_bit(GLF_FROZEN, &gl->gl_flags)) {
- up_read(&gfs2_umount_flush_sem);
+ if (test_bit(GLF_FROZEN, &gl->gl_flags))
return;
- }
}
set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
gfs2_glock_hold(gl);
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
gfs2_glock_put(gl);
- up_read(&gfs2_umount_flush_sem);
}
/**
@@ -1389,12 +1389,10 @@ static void thaw_glock(struct gfs2_glock *gl)
{
if (!test_and_clear_bit(GLF_FROZEN, &gl->gl_flags))
return;
- down_read(&gfs2_umount_flush_sem);
set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
gfs2_glock_hold(gl);
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
gfs2_glock_put(gl);
- up_read(&gfs2_umount_flush_sem);
}
/**
@@ -1580,7 +1578,7 @@ static const char *gflags2str(char *buf, const unsigned long *gflags)
if (test_bit(GLF_REPLY_PENDING, gflags))
*p++ = 'r';
if (test_bit(GLF_INITIAL, gflags))
- *p++ = 'i';
+ *p++ = 'I';
if (test_bit(GLF_FROZEN, gflags))
*p++ = 'F';
*p = 0;