vfs: convert fs_supers to hlist

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 14 insertions, 12 deletions

diff --git a/fs/super.c b/fs/super.c
index 66a12f9bfc20..bab11bad13ba 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -136,7 +136,7 @@ static struct super_block *alloc_super(struct file_system_type *type)
                 INIT_LIST_HEAD(&s->s_files);
 #endif
                 s->s_bdi = &default_backing_dev_info;
-                INIT_LIST_HEAD(&s->s_instances);
+                INIT_HLIST_NODE(&s->s_instances);
                 INIT_HLIST_BL_HEAD(&s->s_anon);
                 INIT_LIST_HEAD(&s->s_inodes);
                 INIT_LIST_HEAD(&s->s_dentry_lru);
@@ -328,7 +328,7 @@ static int grab_super(struct super_block *s) __releases(sb_lock)
 bool grab_super_passive(struct super_block *sb)
 {
         spin_lock(&sb_lock);
-        if (list_empty(&sb->s_instances)) {
+        if (hlist_unhashed(&sb->s_instances)) {
                 spin_unlock(&sb_lock);
                 return false;
         }
@@ -400,7 +400,7 @@ void generic_shutdown_super(struct super_block *sb)
         }
         spin_lock(&sb_lock);
         /* should be initialized for __put_super_and_need_restart() */
-        list_del_init(&sb->s_instances);
+        hlist_del_init(&sb->s_instances);
         spin_unlock(&sb_lock);
         up_write(&sb->s_umount);
 }
@@ -420,13 +420,14 @@ struct super_block *sget(struct file_system_type *type,
                         void *data)
 {
         struct super_block *s = NULL;
+        struct hlist_node *node;
         struct super_block *old;
         int err;
 
 retry:
         spin_lock(&sb_lock);
         if (test) {
-                list_for_each_entry(old, &type->fs_supers, s_instances) {
+                hlist_for_each_entry(old, node, &type->fs_supers, s_instances) {
                         if (!test(old, data))
                                 continue;
                         if (!grab_super(old))
@@ -462,7 +463,7 @@ retry:
         s->s_type = type;
         strlcpy(s->s_id, type->name, sizeof(s->s_id));
         list_add_tail(&s->s_list, &super_blocks);
-        list_add(&s->s_instances, &type->fs_supers);
+        hlist_add_head(&s->s_instances, &type->fs_supers);
         spin_unlock(&sb_lock);
         get_filesystem(type);
         register_shrinker(&s->s_shrink);
@@ -497,7 +498,7 @@ void sync_supers(void)
 
         spin_lock(&sb_lock);
         list_for_each_entry(sb, &super_blocks, s_list) {
-                if (list_empty(&sb->s_instances))
+                if (hlist_unhashed(&sb->s_instances))
                         continue;
                 if (sb->s_op->write_super && sb->s_dirt) {
                         sb->s_count++;
@@ -533,7 +534,7 @@ void iterate_supers(void (*f)(struct super_block *, void *), void *arg)
 
         spin_lock(&sb_lock);
         list_for_each_entry(sb, &super_blocks, s_list) {
-                if (list_empty(&sb->s_instances))
+                if (hlist_unhashed(&sb->s_instances))
                         continue;
                 sb->s_count++;
                 spin_unlock(&sb_lock);
@@ -566,9 +567,10 @@ void iterate_supers_type(struct file_system_type *type,
         void (*f)(struct super_block *, void *), void *arg)
 {
         struct super_block *sb, *p = NULL;
+        struct hlist_node *node;
 
         spin_lock(&sb_lock);
-        list_for_each_entry(sb, &type->fs_supers, s_instances) {
+        hlist_for_each_entry(sb, node, &type->fs_supers, s_instances) {
                 sb->s_count++;
                 spin_unlock(&sb_lock);
 
@@ -607,7 +609,7 @@ struct super_block *get_super(struct block_device *bdev)
         spin_lock(&sb_lock);
 rescan:
         list_for_each_entry(sb, &super_blocks, s_list) {
-                if (list_empty(&sb->s_instances))
+                if (hlist_unhashed(&sb->s_instances))
                         continue;
                 if (sb->s_bdev == bdev) {
                         sb->s_count++;
@@ -647,7 +649,7 @@ struct super_block *get_active_super(struct block_device *bdev)
 restart:
         spin_lock(&sb_lock);
         list_for_each_entry(sb, &super_blocks, s_list) {
-                if (list_empty(&sb->s_instances))
+                if (hlist_unhashed(&sb->s_instances))
                         continue;
                 if (sb->s_bdev == bdev) {
                         if (grab_super(sb)) /* drops sb_lock */
@@ -667,7 +669,7 @@ struct super_block *user_get_super(dev_t dev)
         spin_lock(&sb_lock);
 rescan:
         list_for_each_entry(sb, &super_blocks, s_list) {
-                if (list_empty(&sb->s_instances))
+                if (hlist_unhashed(&sb->s_instances))
                         continue;
                 if (sb->s_dev ==  dev) {
                         sb->s_count++;
@@ -756,7 +758,7 @@ static void do_emergency_remount(struct work_struct *work)
 
         spin_lock(&sb_lock);
         list_for_each_entry(sb, &super_blocks, s_list) {
-                if (list_empty(&sb->s_instances))
+                if (hlist_unhashed(&sb->s_instances))
                         continue;
                 sb->s_count++;
                 spin_unlock(&sb_lock);