GFS2: Move glock superblock pointer to field gl_name

What uniquely identifies a glock in the glock hash table is not
gl_name, but gl_name and its superblock pointer. This patch makes
the gl_name field correspond to a unique glock identifier. That will
allow us to simplify hashing with a future patch, since the hash
algorithm can then take the gl_name and hash its components in one
operation.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Acked-by: Steven Whitehouse <swhiteho@redhat.com>

11 files changed, 75 insertions, 74 deletions

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index a694413a6e32..13cba6e3ef6a 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -119,7 +119,7 @@ static void gfs2_glock_dealloc(struct rcu_head *rcu)
 
 void gfs2_glock_free(struct gfs2_glock *gl)
 {
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 
         call_rcu(&gl->gl_rcu, gfs2_glock_dealloc);
         if (atomic_dec_and_test(&sdp->sd_glock_disposal))
@@ -192,7 +192,7 @@ static void gfs2_glock_remove_from_lru(struct gfs2_glock *gl)
 
 void gfs2_glock_put(struct gfs2_glock *gl)
 {
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         struct address_space *mapping = gfs2_glock2aspace(gl);
 
         if (lockref_put_or_lock(&gl->gl_lockref))
@@ -220,7 +220,6 @@ void gfs2_glock_put(struct gfs2_glock *gl)
  */
 
 static struct gfs2_glock *search_bucket(unsigned int hash,
-                                        const struct gfs2_sbd *sdp,
                                         const struct lm_lockname *name)
 {
         struct gfs2_glock *gl;
@@ -229,8 +228,6 @@ static struct gfs2_glock *search_bucket(unsigned int hash,
         hlist_bl_for_each_entry_rcu(gl, h, &gl_hash_table[hash], gl_list) {
                 if (!lm_name_equal(&gl->gl_name, name))
                         continue;
-                if (gl->gl_sbd != sdp)
-                        continue;
                 if (lockref_get_not_dead(&gl->gl_lockref))
                         return gl;
         }
@@ -506,7 +503,7 @@ __releases(&gl->gl_spin)
 __acquires(&gl->gl_spin)
 {
         const struct gfs2_glock_operations *glops = gl->gl_ops;
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         unsigned int lck_flags = gh ? gh->gh_flags : 0;
         int ret;
 
@@ -628,7 +625,7 @@ out_unlock:
 static void delete_work_func(struct work_struct *work)
 {
         struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_delete);
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         struct gfs2_inode *ip;
         struct inode *inode;
         u64 no_addr = gl->gl_name.ln_number;
@@ -704,14 +701,16 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
                    struct gfs2_glock **glp)
 {
         struct super_block *s = sdp->sd_vfs;
-        struct lm_lockname name = { .ln_number = number, .ln_type = glops->go_type };
+        struct lm_lockname name = { .ln_number = number,
+                                    .ln_type = glops->go_type,
+                                    .ln_sbd = sdp };
         struct gfs2_glock *gl, *tmp;
         unsigned int hash = gl_hash(sdp, &name);
         struct address_space *mapping;
         struct kmem_cache *cachep;
 
         rcu_read_lock();
-        gl = search_bucket(hash, sdp, &name);
+        gl = search_bucket(hash, &name);
         rcu_read_unlock();
 
         *glp = gl;
@@ -739,7 +738,6 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
         }
 
         atomic_inc(&sdp->sd_glock_disposal);
-        gl->gl_sbd = sdp;
         gl->gl_flags = 0;
         gl->gl_name = name;
         gl->gl_lockref.count = 1;
@@ -772,7 +770,7 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
         }
 
         spin_lock_bucket(hash);
-        tmp = search_bucket(hash, sdp, &name);
+        tmp = search_bucket(hash, &name);
         if (tmp) {
                 spin_unlock_bucket(hash);
                 kfree(gl->gl_lksb.sb_lvbptr);
@@ -928,7 +926,7 @@ __releases(&gl->gl_spin)
 __acquires(&gl->gl_spin)
 {
         struct gfs2_glock *gl = gh->gh_gl;
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         struct list_head *insert_pt = NULL;
         struct gfs2_holder *gh2;
         int try_futile = 0;
@@ -1006,7 +1004,7 @@ trap_recursive:
 int gfs2_glock_nq(struct gfs2_holder *gh)
 {
         struct gfs2_glock *gl = gh->gh_gl;
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         int error = 0;
 
         if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
@@ -1313,7 +1311,7 @@ static int gfs2_should_freeze(const struct gfs2_glock *gl)
 
 void gfs2_glock_complete(struct gfs2_glock *gl, int ret)
 {
-        struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct;
+        struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct;
 
         spin_lock(&gl->gl_spin);
         gl->gl_reply = ret;
@@ -1471,7 +1469,7 @@ static void examine_bucket(glock_examiner examiner, const struct gfs2_sbd *sdp,
 
         rcu_read_lock();
         hlist_bl_for_each_entry_rcu(gl, pos, head, gl_list) {
-                if ((gl->gl_sbd == sdp) && lockref_get_not_dead(&gl->gl_lockref))
+                if ((gl->gl_name.ln_sbd == sdp) && lockref_get_not_dead(&gl->gl_lockref))
                         examiner(gl);
         }
         rcu_read_unlock();
@@ -1569,7 +1567,7 @@ void gfs2_glock_finish_truncate(struct gfs2_inode *ip)
         int ret;
 
         ret = gfs2_truncatei_resume(ip);
-        gfs2_assert_withdraw(gl->gl_sbd, ret == 0);
+        gfs2_assert_withdraw(gl->gl_name.ln_sbd, ret == 0);
 
         spin_lock(&gl->gl_spin);
         clear_bit(GLF_LOCK, &gl->gl_flags);
@@ -1872,7 +1870,7 @@ static int gfs2_glock_iter_next(struct gfs2_glock_iter *gi)
                         gi->nhash = 0;
                 }
         /* Skip entries for other sb and dead entries */
-        } while (gi->sdp != gi->gl->gl_sbd ||
+        } while (gi->sdp != gi->gl->gl_name.ln_sbd ||
                  __lockref_is_dead(&gi->gl->gl_lockref));
 
         return 0;
diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index fa3fa5e94553..1f6c9c3fe5cb 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -32,13 +32,15 @@ struct workqueue_struct *gfs2_freeze_wq;
 
 static void gfs2_ail_error(struct gfs2_glock *gl, const struct buffer_head *bh)
 {
-        fs_err(gl->gl_sbd, "AIL buffer %p: blocknr %llu state 0x%08lx mapping %p page state 0x%lx\n",
+        fs_err(gl->gl_name.ln_sbd,
+               "AIL buffer %p: blocknr %llu state 0x%08lx mapping %p page "
+               "state 0x%lx\n",
                bh, (unsigned long long)bh->b_blocknr, bh->b_state,
                bh->b_page->mapping, bh->b_page->flags);
-        fs_err(gl->gl_sbd, "AIL glock %u:%llu mapping %p\n",
+        fs_err(gl->gl_name.ln_sbd, "AIL glock %u:%llu mapping %p\n",
                gl->gl_name.ln_type, gl->gl_name.ln_number,
                gfs2_glock2aspace(gl));
-        gfs2_lm_withdraw(gl->gl_sbd, "AIL error\n");
+        gfs2_lm_withdraw(gl->gl_name.ln_sbd, "AIL error\n");
 }
 
 /**
@@ -52,7 +54,7 @@ static void gfs2_ail_error(struct gfs2_glock *gl, const struct buffer_head *bh)
 static void __gfs2_ail_flush(struct gfs2_glock *gl, bool fsync,
                              unsigned int nr_revokes)
 {
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         struct list_head *head = &gl->gl_ail_list;
         struct gfs2_bufdata *bd, *tmp;
         struct buffer_head *bh;
@@ -80,7 +82,7 @@ static void __gfs2_ail_flush(struct gfs2_glock *gl, bool fsync,
 
 static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
 {
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         struct gfs2_trans tr;
 
         memset(&tr, 0, sizeof(tr));
@@ -109,7 +111,7 @@ static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
 
 void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
 {
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         unsigned int revokes = atomic_read(&gl->gl_ail_count);
         unsigned int max_revokes = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
         int ret;
@@ -139,7 +141,7 @@ void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
 
 static void rgrp_go_sync(struct gfs2_glock *gl)
 {
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         struct address_space *mapping = &sdp->sd_aspace;
         struct gfs2_rgrpd *rgd;
         int error;
@@ -179,7 +181,7 @@ static void rgrp_go_sync(struct gfs2_glock *gl)
 
 static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
 {
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         struct address_space *mapping = &sdp->sd_aspace;
         struct gfs2_rgrpd *rgd = gl->gl_object;
 
@@ -218,7 +220,7 @@ static void inode_go_sync(struct gfs2_glock *gl)
 
         GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
 
-        gfs2_log_flush(gl->gl_sbd, gl, NORMAL_FLUSH);
+        gfs2_log_flush(gl->gl_name.ln_sbd, gl, NORMAL_FLUSH);
         filemap_fdatawrite(metamapping);
         if (ip) {
                 struct address_space *mapping = ip->i_inode.i_mapping;
@@ -252,7 +254,7 @@ static void inode_go_inval(struct gfs2_glock *gl, int flags)
 {
         struct gfs2_inode *ip = gl->gl_object;
 
-        gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
+        gfs2_assert_withdraw(gl->gl_name.ln_sbd, !atomic_read(&gl->gl_ail_count));
 
         if (flags & DIO_METADATA) {
                 struct address_space *mapping = gfs2_glock2aspace(gl);
@@ -264,9 +266,9 @@ static void inode_go_inval(struct gfs2_glock *gl, int flags)
                 }
         }
 
-        if (ip == GFS2_I(gl->gl_sbd->sd_rindex)) {
-                gfs2_log_flush(gl->gl_sbd, NULL, NORMAL_FLUSH);
-                gl->gl_sbd->sd_rindex_uptodate = 0;
+        if (ip == GFS2_I(gl->gl_name.ln_sbd->sd_rindex)) {
+                gfs2_log_flush(gl->gl_name.ln_sbd, NULL, NORMAL_FLUSH);
+                gl->gl_name.ln_sbd->sd_rindex_uptodate = 0;
         }
         if (ip && S_ISREG(ip->i_inode.i_mode))
                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
@@ -281,7 +283,7 @@ static void inode_go_inval(struct gfs2_glock *gl, int flags)
 
 static int inode_go_demote_ok(const struct gfs2_glock *gl)
 {
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         struct gfs2_holder *gh;
 
         if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
@@ -416,7 +418,7 @@ int gfs2_inode_refresh(struct gfs2_inode *ip)
 static int inode_go_lock(struct gfs2_holder *gh)
 {
         struct gfs2_glock *gl = gh->gh_gl;
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         struct gfs2_inode *ip = gl->gl_object;
         int error = 0;
 
@@ -477,7 +479,7 @@ static void inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
 static void freeze_go_sync(struct gfs2_glock *gl)
 {
         int error = 0;
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 
         if (gl->gl_state == LM_ST_SHARED &&
             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
@@ -500,7 +502,7 @@ static void freeze_go_sync(struct gfs2_glock *gl)
 
 static int freeze_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
 {
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
         struct gfs2_glock *j_gl = ip->i_gl;
         struct gfs2_log_header_host head;
@@ -545,7 +547,7 @@ static int freeze_go_demote_ok(const struct gfs2_glock *gl)
 static void iopen_go_callback(struct gfs2_glock *gl, bool remote)
 {
         struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object;
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 
         if (!remote || (sdp->sd_vfs->s_flags & MS_RDONLY))
                 return;
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index a1ec7c20e498..35a55f3d6d3b 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -203,13 +203,15 @@ enum {
 };
 
 struct lm_lockname {
+        struct gfs2_sbd *ln_sbd;
         u64 ln_number;
         unsigned int ln_type;
 };
 
 #define lm_name_equal(name1, name2) \
-        (((name1)->ln_number == (name2)->ln_number) && \
-         ((name1)->ln_type == (name2)->ln_type))
+        (((name1)->ln_number == (name2)->ln_number) &&  \
+         ((name1)->ln_type == (name2)->ln_type) &&      \
+         ((name1)->ln_sbd == (name2)->ln_sbd))
 
 
 struct gfs2_glock_operations {
@@ -327,7 +329,6 @@ enum {
 
 struct gfs2_glock {
         struct hlist_bl_node gl_list;
-        struct gfs2_sbd *gl_sbd;
         unsigned long gl_flags;         /* GLF_... */
         struct lm_lockname gl_name;
 
@@ -835,7 +836,7 @@ static inline void gfs2_glstats_inc(struct gfs2_glock *gl, int which)
 
 static inline void gfs2_sbstats_inc(const struct gfs2_glock *gl, int which)
 {
-        const struct gfs2_sbd *sdp = gl->gl_sbd;
+        const struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         preempt_disable();
         this_cpu_ptr(sdp->sd_lkstats)->lkstats[gl->gl_name.ln_type].stats[which]++;
         preempt_enable();
diff --git a/fs/gfs2/lock_dlm.c b/fs/gfs2/lock_dlm.c
index 641383a9c1bb..c962cfcf19b0 100644
--- a/fs/gfs2/lock_dlm.c
+++ b/fs/gfs2/lock_dlm.c
@@ -80,7 +80,7 @@ static inline void gfs2_update_reply_times(struct gfs2_glock *gl)
 
         preempt_disable();
         rtt = ktime_to_ns(ktime_sub(ktime_get_real(), gl->gl_dstamp));
-        lks = this_cpu_ptr(gl->gl_sbd->sd_lkstats);
+        lks = this_cpu_ptr(gl->gl_name.ln_sbd->sd_lkstats);
         gfs2_update_stats(&gl->gl_stats, index, rtt);           /* Local */
         gfs2_update_stats(&lks->lkstats[gltype], index, rtt);   /* Global */
         preempt_enable();
@@ -108,7 +108,7 @@ static inline void gfs2_update_request_times(struct gfs2_glock *gl)
         dstamp = gl->gl_dstamp;
         gl->gl_dstamp = ktime_get_real();
         irt = ktime_to_ns(ktime_sub(gl->gl_dstamp, dstamp));
-        lks = this_cpu_ptr(gl->gl_sbd->sd_lkstats);
+        lks = this_cpu_ptr(gl->gl_name.ln_sbd->sd_lkstats);
         gfs2_update_stats(&gl->gl_stats, GFS2_LKS_SIRT, irt);           /* Local */
         gfs2_update_stats(&lks->lkstats[gltype], GFS2_LKS_SIRT, irt);   /* Global */
         preempt_enable();
@@ -253,7 +253,7 @@ static void gfs2_reverse_hex(char *c, u64 value)
 static int gdlm_lock(struct gfs2_glock *gl, unsigned int req_state,
                      unsigned int flags)
 {
-        struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct;
+        struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct;
         int req;
         u32 lkf;
         char strname[GDLM_STRNAME_BYTES] = "";
@@ -281,7 +281,7 @@ static int gdlm_lock(struct gfs2_glock *gl, unsigned int req_state,
 
 static void gdlm_put_lock(struct gfs2_glock *gl)
 {
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
         int lvb_needs_unlock = 0;
         int error;
@@ -319,7 +319,7 @@ static void gdlm_put_lock(struct gfs2_glock *gl)
 
 static void gdlm_cancel(struct gfs2_glock *gl)
 {
-        struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct;
+        struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct;
         dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, DLM_LKF_CANCEL, NULL, gl);
 }
 
diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index 2c1ae861dc94..7833394a9a20 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -70,7 +70,7 @@ static bool buffer_is_rgrp(const struct gfs2_bufdata *bd)
 static void maybe_release_space(struct gfs2_bufdata *bd)
 {
         struct gfs2_glock *gl = bd->bd_gl;
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         struct gfs2_rgrpd *rgd = gl->gl_object;
         unsigned int index = bd->bd_bh->b_blocknr - gl->gl_name.ln_number;
         struct gfs2_bitmap *bi = rgd->rd_bits + index;
@@ -585,7 +585,7 @@ static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
 static void gfs2_meta_sync(struct gfs2_glock *gl)
 {
         struct address_space *mapping = gfs2_glock2aspace(gl);
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         int error;
 
         if (mapping == NULL)
@@ -595,7 +595,7 @@ static void gfs2_meta_sync(struct gfs2_glock *gl)
         error = filemap_fdatawait(mapping);
 
         if (error)
-                gfs2_io_error(gl->gl_sbd);
+                gfs2_io_error(gl->gl_name.ln_sbd);
 }
 
 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index b984a6e190bc..0e1d4be5865a 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -114,7 +114,7 @@ const struct address_space_operations gfs2_rgrp_aops = {
 struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create)
 {
         struct address_space *mapping = gfs2_glock2aspace(gl);
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         struct page *page;
         struct buffer_head *bh;
         unsigned int shift;
@@ -200,7 +200,7 @@ struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno)
 int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
                    struct buffer_head **bhp)
 {
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         struct buffer_head *bh;
 
         if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) {
@@ -362,7 +362,7 @@ int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
 
 struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen)
 {
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         struct buffer_head *first_bh, *bh;
         u32 max_ra = gfs2_tune_get(sdp, gt_max_readahead) >>
                           sdp->sd_sb.sb_bsize_shift;
diff --git a/fs/gfs2/meta_io.h b/fs/gfs2/meta_io.h
index ac5d8027d335..8ca161567a93 100644
--- a/fs/gfs2/meta_io.h
+++ b/fs/gfs2/meta_io.h
@@ -44,7 +44,7 @@ static inline struct gfs2_sbd *gfs2_mapping2sbd(struct address_space *mapping)
 {
         struct inode *inode = mapping->host;
         if (mapping->a_ops == &gfs2_meta_aops)
-                return (((struct gfs2_glock *)mapping) - 1)->gl_sbd;
+                return (((struct gfs2_glock *)mapping) - 1)->gl_name.ln_sbd;
         else if (mapping->a_ops == &gfs2_rgrp_aops)
                 return container_of(mapping, struct gfs2_sbd, sd_aspace);
         else
diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 9b61f92fcfdf..3a31226531ea 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -119,7 +119,7 @@ static void gfs2_qd_dispose(struct list_head *list)
 
         while (!list_empty(list)) {
                 qd = list_entry(list->next, struct gfs2_quota_data, qd_lru);
-                sdp = qd->qd_gl->gl_sbd;
+                sdp = qd->qd_gl->gl_name.ln_sbd;
 
                 list_del(&qd->qd_lru);
 
@@ -302,7 +302,7 @@ static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
 
 static void qd_hold(struct gfs2_quota_data *qd)
 {
-        struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
+        struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
         gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
         lockref_get(&qd->qd_lockref);
 }
@@ -367,7 +367,7 @@ static void slot_put(struct gfs2_quota_data *qd)
 
 static int bh_get(struct gfs2_quota_data *qd)
 {
-        struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
+        struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
         unsigned int block, offset;
         struct buffer_head *bh;
@@ -414,7 +414,7 @@ fail:
 
 static void bh_put(struct gfs2_quota_data *qd)
 {
-        struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
+        struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
 
         mutex_lock(&sdp->sd_quota_mutex);
         gfs2_assert(sdp, qd->qd_bh_count);
@@ -486,7 +486,7 @@ static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 
 static void qd_unlock(struct gfs2_quota_data *qd)
 {
-        gfs2_assert_warn(qd->qd_gl->gl_sbd,
+        gfs2_assert_warn(qd->qd_gl->gl_name.ln_sbd,
                          test_bit(QDF_LOCKED, &qd->qd_flags));
         clear_bit(QDF_LOCKED, &qd->qd_flags);
         bh_put(qd);
@@ -614,7 +614,7 @@ static int sort_qd(const void *a, const void *b)
 
 static void do_qc(struct gfs2_quota_data *qd, s64 change)
 {
-        struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
+        struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
         struct gfs2_quota_change *qc = qd->qd_bh_qc;
         s64 x;
@@ -831,7 +831,7 @@ static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 
 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 {
-        struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
+        struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_name.ln_sbd;
         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
         struct gfs2_alloc_parms ap = { .aflags = 0, };
         unsigned int data_blocks, ind_blocks;
@@ -922,7 +922,7 @@ out:
                 gfs2_glock_dq_uninit(&ghs[qx]);
         mutex_unlock(&ip->i_inode.i_mutex);
         kfree(ghs);
-        gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl, NORMAL_FLUSH);
+        gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl, NORMAL_FLUSH);
         return error;
 }
 
@@ -954,7 +954,7 @@ static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
                     struct gfs2_holder *q_gh)
 {
-        struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
+        struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
         struct gfs2_holder i_gh;
         int error;
@@ -1037,7 +1037,7 @@ int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 
 static int need_sync(struct gfs2_quota_data *qd)
 {
-        struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
+        struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
         struct gfs2_tune *gt = &sdp->sd_tune;
         s64 value;
         unsigned int num, den;
@@ -1125,7 +1125,7 @@ out:
 
 static int print_message(struct gfs2_quota_data *qd, char *type)
 {
-        struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
+        struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
 
         fs_info(sdp, "quota %s for %s %u\n",
                 type,
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index c6c62321dfd6..c92ae7fd36f3 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1860,7 +1860,7 @@ static void try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked, u64 skip
 static bool gfs2_rgrp_congested(const struct gfs2_rgrpd *rgd, int loops)
 {
         const struct gfs2_glock *gl = rgd->rd_gl;
-        const struct gfs2_sbd *sdp = gl->gl_sbd;
+        const struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         struct gfs2_lkstats *st;
         s64 r_dcount, l_dcount;
         s64 l_srttb, a_srttb = 0;
diff --git a/fs/gfs2/trace_gfs2.h b/fs/gfs2/trace_gfs2.h
index 20c007d747ab..fff47d0e0ef5 100644
--- a/fs/gfs2/trace_gfs2.h
+++ b/fs/gfs2/trace_gfs2.h
@@ -104,7 +104,7 @@ TRACE_EVENT(gfs2_glock_state_change,
         ),
 
         TP_fast_assign(
-                __entry->dev            = gl->gl_sbd->sd_vfs->s_dev;
+                __entry->dev            = gl->gl_name.ln_sbd->sd_vfs->s_dev;
                 __entry->glnum          = gl->gl_name.ln_number;
                 __entry->gltype         = gl->gl_name.ln_type;
                 __entry->cur_state      = glock_trace_state(gl->gl_state);
@@ -140,7 +140,7 @@ TRACE_EVENT(gfs2_glock_put,
         ),
 
         TP_fast_assign(
-                __entry->dev            = gl->gl_sbd->sd_vfs->s_dev;
+                __entry->dev            = gl->gl_name.ln_sbd->sd_vfs->s_dev;
                 __entry->gltype         = gl->gl_name.ln_type;
                 __entry->glnum          = gl->gl_name.ln_number;
                 __entry->cur_state      = glock_trace_state(gl->gl_state);
@@ -174,7 +174,7 @@ TRACE_EVENT(gfs2_demote_rq,
         ),
 
         TP_fast_assign(
-                __entry->dev            = gl->gl_sbd->sd_vfs->s_dev;
+                __entry->dev            = gl->gl_name.ln_sbd->sd_vfs->s_dev;
                 __entry->gltype         = gl->gl_name.ln_type;
                 __entry->glnum          = gl->gl_name.ln_number;
                 __entry->cur_state      = glock_trace_state(gl->gl_state);
@@ -209,7 +209,7 @@ TRACE_EVENT(gfs2_promote,
         ),
 
         TP_fast_assign(
-                __entry->dev    = gh->gh_gl->gl_sbd->sd_vfs->s_dev;
+                __entry->dev    = gh->gh_gl->gl_name.ln_sbd->sd_vfs->s_dev;
                 __entry->glnum  = gh->gh_gl->gl_name.ln_number;
                 __entry->gltype = gh->gh_gl->gl_name.ln_type;
                 __entry->first  = first;
@@ -239,7 +239,7 @@ TRACE_EVENT(gfs2_glock_queue,
         ),
 
         TP_fast_assign(
-                __entry->dev    = gh->gh_gl->gl_sbd->sd_vfs->s_dev;
+                __entry->dev    = gh->gh_gl->gl_name.ln_sbd->sd_vfs->s_dev;
                 __entry->glnum  = gh->gh_gl->gl_name.ln_number;
                 __entry->gltype = gh->gh_gl->gl_name.ln_type;
                 __entry->queue  = queue;
@@ -278,7 +278,7 @@ TRACE_EVENT(gfs2_glock_lock_time,
         ),
 
         TP_fast_assign(
-                __entry->dev            = gl->gl_sbd->sd_vfs->s_dev;
+                __entry->dev            = gl->gl_name.ln_sbd->sd_vfs->s_dev;
                 __entry->glnum          = gl->gl_name.ln_number;
                 __entry->gltype         = gl->gl_name.ln_type;
                 __entry->status         = gl->gl_lksb.sb_status;
@@ -333,7 +333,7 @@ TRACE_EVENT(gfs2_pin,
         ),
 
         TP_fast_assign(
-                __entry->dev            = bd->bd_gl->gl_sbd->sd_vfs->s_dev;
+                __entry->dev            = bd->bd_gl->gl_name.ln_sbd->sd_vfs->s_dev;
                 __entry->pin            = pin;
                 __entry->len            = bd->bd_bh->b_size;
                 __entry->block          = bd->bd_bh->b_blocknr;
@@ -449,7 +449,7 @@ TRACE_EVENT(gfs2_bmap,
         ),
 
         TP_fast_assign(
-                __entry->dev            = ip->i_gl->gl_sbd->sd_vfs->s_dev;
+                __entry->dev            = ip->i_gl->gl_name.ln_sbd->sd_vfs->s_dev;
                 __entry->lblock         = lblock;
                 __entry->pblock         = buffer_mapped(bh) ?  bh->b_blocknr : 0;
                 __entry->inum           = ip->i_no_addr;
@@ -489,7 +489,7 @@ TRACE_EVENT(gfs2_block_alloc,
         ),
 
         TP_fast_assign(
-                __entry->dev            = rgd->rd_gl->gl_sbd->sd_vfs->s_dev;
+                __entry->dev            = rgd->rd_gl->gl_name.ln_sbd->sd_vfs->s_dev;
                 __entry->start          = block;
                 __entry->inum           = ip->i_no_addr;
                 __entry->len            = len;
diff --git a/fs/gfs2/trans.c b/fs/gfs2/trans.c
index 88bff2430669..b95d0d625f32 100644
--- a/fs/gfs2/trans.c
+++ b/fs/gfs2/trans.c
@@ -158,7 +158,7 @@ static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl,
 void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
 {
         struct gfs2_trans *tr = current->journal_info;
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         struct address_space *mapping = bh->b_page->mapping;
         struct gfs2_inode *ip = GFS2_I(mapping->host);
         struct gfs2_bufdata *bd;
@@ -224,7 +224,7 @@ static void meta_lo_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
 void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
 {
 
-        struct gfs2_sbd *sdp = gl->gl_sbd;
+        struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
         struct gfs2_bufdata *bd;
 
         lock_buffer(bh);