[GFS2] Don't add glocks to the journal

The only reason for adding glocks to the journal was to keep track
of which locks required a log flush prior to release. We add a
flag to the glock to allow this check to be made in a simpler way.

This reduces the size of a glock (by 12 bytes on i386, 24 on x86_64)
and means that we can avoid extra work during the journal flush.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

9 files changed, 21 insertions, 78 deletions

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 5fbd9d34ce23..d83df6888402 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -346,7 +346,6 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
         gl->gl_object = NULL;
         gl->gl_sbd = sdp;
         gl->gl_aspace = NULL;
-        lops_init_le(&gl->gl_le, &gfs2_glock_lops);
         INIT_DELAYED_WORK(&gl->gl_work, glock_work_func);
 
         /* If this glock protects actual on-disk data or metadata blocks,
@@ -1900,8 +1899,6 @@ static int dump_glock(struct glock_iter *gi, struct gfs2_glock *gl)
         print_dbg(gi, "  req_bh = %s\n", (gl->gl_req_bh) ? "yes" : "no");
         print_dbg(gi, "  lvb_count = %d\n", atomic_read(&gl->gl_lvb_count));
         print_dbg(gi, "  object = %s\n", (gl->gl_object) ? "yes" : "no");
-        print_dbg(gi, "  le = %s\n",
-                   (list_empty(&gl->gl_le.le_list)) ? "no" : "yes");
         print_dbg(gi, "  reclaim = %s\n",
                    (list_empty(&gl->gl_reclaim)) ? "no" : "yes");
         if (gl->gl_aspace)
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 478023e9fda6..911822d1e4c0 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -168,6 +168,7 @@ enum {
         GLF_PENDING_DEMOTE      = 4,
         GLF_DIRTY               = 5,
         GLF_DEMOTE_IN_PROGRESS  = 6,
+        GLF_LFLUSH              = 7,
 };
 
 struct gfs2_glock {
@@ -208,7 +209,6 @@ struct gfs2_glock {
         struct gfs2_sbd *gl_sbd;
 
         struct inode *gl_aspace;
-        struct gfs2_log_element gl_le;
         struct list_head gl_ail_list;
         atomic_t gl_ail_count;
         struct delayed_work gl_work;
@@ -584,13 +584,11 @@ struct gfs2_sbd {
         unsigned int sd_log_commited_databuf;
         unsigned int sd_log_commited_revoke;
 
-        unsigned int sd_log_num_gl;
         unsigned int sd_log_num_buf;
         unsigned int sd_log_num_revoke;
         unsigned int sd_log_num_rg;
         unsigned int sd_log_num_databuf;
 
-        struct list_head sd_log_le_gl;
         struct list_head sd_log_le_buf;
         struct list_head sd_log_le_revoke;
         struct list_head sd_log_le_rg;
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 532784eb5ba4..92959d093adf 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -362,7 +362,8 @@ int gfs2_dinode_dealloc(struct gfs2_inode *ip)
         if (error)
                 goto out_rg_gunlock;
 
-        gfs2_trans_add_gl(ip->i_gl);
+        set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
+        set_bit(GLF_LFLUSH, &ip->i_gl->gl_flags);
 
         gfs2_free_di(rgd, ip);
 
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 1e1fe8def375..d24684330bc3 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -692,20 +692,16 @@ static void gfs2_ordered_wait(struct gfs2_sbd *sdp)
  *
  */
 
-void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
+void __gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
 {
         struct gfs2_ail *ai;
 
         down_write(&sdp->sd_log_flush_lock);
 
-        if (gl) {
-                gfs2_log_lock(sdp);
-                if (list_empty(&gl->gl_le.le_list)) {
-                        gfs2_log_unlock(sdp);
-                        up_write(&sdp->sd_log_flush_lock);
-                        return;
-                }
-                gfs2_log_unlock(sdp);
+        /* Log might have been flushed while we waited for the flush lock */
+        if (gl && !test_bit(GLF_LFLUSH, &gl->gl_flags)) {
+                up_write(&sdp->sd_log_flush_lock);
+                return;
         }
 
         ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL);
@@ -823,7 +819,6 @@ void gfs2_log_shutdown(struct gfs2_sbd *sdp)
         down_write(&sdp->sd_log_flush_lock);
 
         gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved);
-        gfs2_assert_withdraw(sdp, !sdp->sd_log_num_gl);
         gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf);
         gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
         gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg);
diff --git a/fs/gfs2/log.h b/fs/gfs2/log.h
index 24e7161486e2..4babd430b722 100644
--- a/fs/gfs2/log.h
+++ b/fs/gfs2/log.h
@@ -57,7 +57,14 @@ void gfs2_log_incr_head(struct gfs2_sbd *sdp);
 struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp);
 struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp,
                                       struct buffer_head *real);
-void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl);
+void __gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl);
+
+static inline void gfs2_log_flush(struct gfs2_sbd *sbd, struct gfs2_glock *gl)
+{
+        if (!gl || test_bit(GLF_LFLUSH, &gl->gl_flags))
+                __gfs2_log_flush(sbd, gl);
+}
+
 void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *trans);
 void gfs2_remove_from_ail(struct gfs2_bufdata *bd);
 
diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index e901f8f7d650..fae59d69d01a 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -87,6 +87,7 @@ static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
         }
         bd->bd_ail = ai;
         list_add(&bd->bd_ail_st_list, &ai->ai_ail1_list);
+        clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
         gfs2_log_unlock(sdp);
         unlock_buffer(bh);
 }
@@ -124,49 +125,6 @@ static struct buffer_head *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type)
         return bh;
 }
 
-static void __glock_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
-{
-        struct gfs2_glock *gl;
-        struct gfs2_trans *tr = current->journal_info;
-
-        tr->tr_touched = 1;
-
-        gl = container_of(le, struct gfs2_glock, gl_le);
-        if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(gl)))
-                return;
-
-        if (!list_empty(&le->le_list))
-                return;
-
-        gfs2_glock_hold(gl);
-        set_bit(GLF_DIRTY, &gl->gl_flags);
-        sdp->sd_log_num_gl++;
-        list_add(&le->le_list, &sdp->sd_log_le_gl);
-}
-
-static void glock_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
-{
-        gfs2_log_lock(sdp);
-        __glock_lo_add(sdp, le);
-        gfs2_log_unlock(sdp);
-}
-
-static void glock_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
-{
-        struct list_head *head = &sdp->sd_log_le_gl;
-        struct gfs2_glock *gl;
-
-        while (!list_empty(head)) {
-                gl = list_entry(head->next, struct gfs2_glock, gl_le.le_list);
-                list_del_init(&gl->gl_le.le_list);
-                sdp->sd_log_num_gl--;
-
-                gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(gl));
-                gfs2_glock_put(gl);
-        }
-        gfs2_assert_warn(sdp, !sdp->sd_log_num_gl);
-}
-
 static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 {
         struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
@@ -182,7 +140,8 @@ static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
         list_add(&bd->bd_list_tr, &tr->tr_list_buf);
         if (!list_empty(&le->le_list))
                 goto out;
-        __glock_lo_add(sdp, &bd->bd_gl->gl_le);
+        set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
+        set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
         gfs2_meta_check(sdp, bd->bd_bh);
         gfs2_pin(sdp, bd->bd_bh);
         sdp->sd_log_num_buf++;
@@ -568,8 +527,8 @@ static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
         if (!list_empty(&le->le_list))
                 goto out;
 
-        if (tr)
-                __glock_lo_add(sdp, &bd->bd_gl->gl_le);
+        set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
+        set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
         if (gfs2_is_jdata(ip)) {
                 gfs2_pin(sdp, bd->bd_bh);
                 tr->tr_num_databuf_new++;
@@ -776,12 +735,6 @@ static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 }
 
 
-const struct gfs2_log_operations gfs2_glock_lops = {
-        .lo_add = glock_lo_add,
-        .lo_after_commit = glock_lo_after_commit,
-        .lo_name = "glock",
-};
-
 const struct gfs2_log_operations gfs2_buf_lops = {
         .lo_add = buf_lo_add,
         .lo_incore_commit = buf_lo_incore_commit,
@@ -819,7 +772,6 @@ const struct gfs2_log_operations gfs2_databuf_lops = {
 };
 
 const struct gfs2_log_operations *gfs2_log_ops[] = {
-        &gfs2_glock_lops,
         &gfs2_databuf_lops,
         &gfs2_buf_lops,
         &gfs2_rg_lops,
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 17de58e83d92..52aaba96d5da 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -77,7 +77,6 @@ static struct gfs2_sbd *init_sbd(struct super_block *sb)
 
         spin_lock_init(&sdp->sd_log_lock);
 
-        INIT_LIST_HEAD(&sdp->sd_log_le_gl);
         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
diff --git a/fs/gfs2/trans.c b/fs/gfs2/trans.c
index 717983e2c2ae..73e5d92a657c 100644
--- a/fs/gfs2/trans.c
+++ b/fs/gfs2/trans.c
@@ -114,11 +114,6 @@ void gfs2_trans_end(struct gfs2_sbd *sdp)
                 gfs2_log_flush(sdp, NULL);
 }
 
-void gfs2_trans_add_gl(struct gfs2_glock *gl)
-{
-        lops_add(gl->gl_sbd, &gl->gl_le);
-}
-
 /**
  * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
  * @gl: the glock the buffer belongs to
diff --git a/fs/gfs2/trans.h b/fs/gfs2/trans.h
index 043d5f4b9c4c..e826f0dab80a 100644
--- a/fs/gfs2/trans.h
+++ b/fs/gfs2/trans.h
@@ -30,7 +30,6 @@ int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
 
 void gfs2_trans_end(struct gfs2_sbd *sdp);
 
-void gfs2_trans_add_gl(struct gfs2_glock *gl);
 void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta);
 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd);
 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno);