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[GFS2] Eliminate gl_req_bh
This patch further reduces the memory needs of GFS2 by eliminating the gl_req_bh variable from struct gfs2_glock. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Bob Peterson
Steven Whitehouse
parent
110acf3837
commit
ab0d756681
107
fs/gfs2/glock.c
107
fs/gfs2/glock.c
@ -338,7 +338,6 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
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gl->gl_ip = 0;
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gl->gl_ops = glops;
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gl->gl_req_gh = NULL;
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gl->gl_req_bh = NULL;
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gl->gl_vn = 0;
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gl->gl_stamp = jiffies;
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gl->gl_tchange = jiffies;
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@ -743,6 +742,50 @@ static void state_change(struct gfs2_glock *gl, unsigned int new_state)
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gl->gl_tchange = jiffies;
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}
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/**
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* drop_bh - Called after a lock module unlock completes
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* @gl: the glock
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* @ret: the return status
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*
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* Doesn't wake up the process waiting on the struct gfs2_holder (if any)
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* Doesn't drop the reference on the glock the top half took out
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*
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*/
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static void drop_bh(struct gfs2_glock *gl, unsigned int ret)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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const struct gfs2_glock_operations *glops = gl->gl_ops;
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struct gfs2_holder *gh = gl->gl_req_gh;
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gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags));
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gfs2_assert_warn(sdp, list_empty(&gl->gl_holders));
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gfs2_assert_warn(sdp, !ret);
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state_change(gl, LM_ST_UNLOCKED);
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if (glops->go_inval)
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glops->go_inval(gl, DIO_METADATA);
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if (gh) {
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spin_lock(&gl->gl_spin);
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list_del_init(&gh->gh_list);
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gh->gh_error = 0;
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spin_unlock(&gl->gl_spin);
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}
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spin_lock(&gl->gl_spin);
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gfs2_demote_wake(gl);
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gl->gl_req_gh = NULL;
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clear_bit(GLF_LOCK, &gl->gl_flags);
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spin_unlock(&gl->gl_spin);
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gfs2_glock_put(gl);
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if (gh)
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gfs2_holder_wake(gh);
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}
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/**
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* xmote_bh - Called after the lock module is done acquiring a lock
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* @gl: The glock in question
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@ -758,6 +801,11 @@ static void xmote_bh(struct gfs2_glock *gl, unsigned int ret)
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int prev_state = gl->gl_state;
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int op_done = 1;
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if ((ret & LM_OUT_ST_MASK) == LM_ST_UNLOCKED) {
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drop_bh(gl, ret);
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return;
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}
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gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags));
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gfs2_assert_warn(sdp, list_empty(&gl->gl_holders));
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gfs2_assert_warn(sdp, !(ret & LM_OUT_ASYNC));
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@ -783,7 +831,6 @@ static void xmote_bh(struct gfs2_glock *gl, unsigned int ret)
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} else {
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spin_lock(&gl->gl_spin);
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if (gl->gl_state != gl->gl_demote_state) {
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gl->gl_req_bh = NULL;
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spin_unlock(&gl->gl_spin);
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gfs2_glock_drop_th(gl);
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gfs2_glock_put(gl);
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@ -825,7 +872,6 @@ out:
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if (op_done) {
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spin_lock(&gl->gl_spin);
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gl->gl_req_gh = NULL;
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gl->gl_req_bh = NULL;
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clear_bit(GLF_LOCK, &gl->gl_flags);
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spin_unlock(&gl->gl_spin);
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}
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@ -864,7 +910,6 @@ static void gfs2_glock_xmote_th(struct gfs2_glock *gl, struct gfs2_holder *gh)
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gfs2_assert_warn(sdp, state != gl->gl_state);
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gfs2_glock_hold(gl);
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gl->gl_req_bh = xmote_bh;
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lck_ret = gfs2_lm_lock(sdp, gl->gl_lock, gl->gl_state, state, lck_flags);
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@ -877,51 +922,6 @@ static void gfs2_glock_xmote_th(struct gfs2_glock *gl, struct gfs2_holder *gh)
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xmote_bh(gl, lck_ret);
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}
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/**
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* drop_bh - Called after a lock module unlock completes
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* @gl: the glock
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* @ret: the return status
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*
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* Doesn't wake up the process waiting on the struct gfs2_holder (if any)
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* Doesn't drop the reference on the glock the top half took out
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*
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*/
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static void drop_bh(struct gfs2_glock *gl, unsigned int ret)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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const struct gfs2_glock_operations *glops = gl->gl_ops;
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struct gfs2_holder *gh = gl->gl_req_gh;
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gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags));
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gfs2_assert_warn(sdp, list_empty(&gl->gl_holders));
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gfs2_assert_warn(sdp, !ret);
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state_change(gl, LM_ST_UNLOCKED);
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if (glops->go_inval)
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glops->go_inval(gl, DIO_METADATA);
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if (gh) {
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spin_lock(&gl->gl_spin);
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list_del_init(&gh->gh_list);
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gh->gh_error = 0;
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spin_unlock(&gl->gl_spin);
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}
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spin_lock(&gl->gl_spin);
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gfs2_demote_wake(gl);
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gl->gl_req_gh = NULL;
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gl->gl_req_bh = NULL;
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clear_bit(GLF_LOCK, &gl->gl_flags);
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spin_unlock(&gl->gl_spin);
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gfs2_glock_put(gl);
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if (gh)
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gfs2_holder_wake(gh);
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}
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/**
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* gfs2_glock_drop_th - call into the lock module to unlock a lock
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* @gl: the glock
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@ -942,7 +942,6 @@ static void gfs2_glock_drop_th(struct gfs2_glock *gl)
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gfs2_assert_warn(sdp, gl->gl_state != LM_ST_UNLOCKED);
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gfs2_glock_hold(gl);
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gl->gl_req_bh = drop_bh;
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ret = gfs2_lm_unlock(sdp, gl->gl_lock, gl->gl_state);
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@ -971,8 +970,7 @@ static void do_cancels(struct gfs2_holder *gh)
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while (gl->gl_req_gh != gh &&
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!test_bit(HIF_HOLDER, &gh->gh_iflags) &&
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!list_empty(&gh->gh_list)) {
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if (gl->gl_req_bh && !(gl->gl_req_gh &&
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(gl->gl_req_gh->gh_flags & GL_NOCANCEL))) {
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if (!(gl->gl_req_gh && (gl->gl_req_gh->gh_flags & GL_NOCANCEL))) {
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spin_unlock(&gl->gl_spin);
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gfs2_lm_cancel(gl->gl_sbd, gl->gl_lock);
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msleep(100);
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@ -1042,7 +1040,6 @@ static int glock_wait_internal(struct gfs2_holder *gh)
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spin_lock(&gl->gl_spin);
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gl->gl_req_gh = NULL;
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gl->gl_req_bh = NULL;
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clear_bit(GLF_LOCK, &gl->gl_flags);
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run_queue(gl);
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spin_unlock(&gl->gl_spin);
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@ -1535,8 +1532,7 @@ void gfs2_glock_cb(void *cb_data, unsigned int type, void *data)
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gl = gfs2_glock_find(sdp, &async->lc_name);
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if (gfs2_assert_warn(sdp, gl))
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return;
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if (!gfs2_assert_warn(sdp, gl->gl_req_bh))
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gl->gl_req_bh(gl, async->lc_ret);
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xmote_bh(gl, async->lc_ret);
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if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
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gfs2_glock_put(gl);
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up_read(&gfs2_umount_flush_sem);
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@ -1898,7 +1894,6 @@ static int dump_glock(struct glock_iter *gi, struct gfs2_glock *gl)
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print_dbg(gi, " gl_owner = -1\n");
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print_dbg(gi, " gl_ip = %lu\n", gl->gl_ip);
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print_dbg(gi, " req_gh = %s\n", (gl->gl_req_gh) ? "yes" : "no");
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print_dbg(gi, " req_bh = %s\n", (gl->gl_req_bh) ? "yes" : "no");
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print_dbg(gi, " lvb_count = %d\n", atomic_read(&gl->gl_lvb_count));
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print_dbg(gi, " object = %s\n", (gl->gl_object) ? "yes" : "no");
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print_dbg(gi, " reclaim = %s\n",
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@ -191,7 +191,6 @@ struct gfs2_glock {
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const struct gfs2_glock_operations *gl_ops;
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struct gfs2_holder *gl_req_gh;
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gfs2_glop_bh_t gl_req_bh;
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void *gl_lock;
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char *gl_lvb;
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