vfs: convert fs_supers to hlist
Al Viro [Tue, 13 Dec 2011 03:53:00 +0000 (22:53 -0500)]
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/filesystems.c
fs/super.c
include/linux/fs.h

index 0845f84..96f2428 100644 (file)
@@ -74,7 +74,6 @@ int register_filesystem(struct file_system_type * fs)
        BUG_ON(strchr(fs->name, '.'));
        if (fs->next)
                return -EBUSY;
-       INIT_LIST_HEAD(&fs->fs_supers);
        write_lock(&file_systems_lock);
        p = find_filesystem(fs->name, strlen(fs->name));
        if (*p)
index 66a12f9..bab11ba 100644 (file)
@@ -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);
index e0bc4ff..ed17e54 100644 (file)
@@ -1440,7 +1440,7 @@ struct super_block {
        struct block_device     *s_bdev;
        struct backing_dev_info *s_bdi;
        struct mtd_info         *s_mtd;
-       struct list_head        s_instances;
+       struct hlist_node       s_instances;
        struct quota_info       s_dquot;        /* Diskquota specific options */
 
        int                     s_frozen;
@@ -1864,7 +1864,7 @@ struct file_system_type {
        void (*kill_sb) (struct super_block *);
        struct module *owner;
        struct file_system_type * next;
-       struct list_head fs_supers;
+       struct hlist_head fs_supers;
 
        struct lock_class_key s_lock_key;
        struct lock_class_key s_umount_key;