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authorAl Viro <viro@zeniv.linux.org.uk>2011-12-13 07:53:00 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-01-04 07:52:39 +0400
commita5166169f9b920cae3c503910cb66a3ac5dd846d (patch)
treeba62f9f2227c4eff9ad6d473f674f72443fba0fb
parent5352d3b65ae6f38e71e16f704414c1db4b4f7228 (diff)
downloadlinux-a5166169f9b920cae3c503910cb66a3ac5dd846d.tar.xz
vfs: convert fs_supers to hlist
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/filesystems.c1
-rw-r--r--fs/super.c26
-rw-r--r--include/linux/fs.h4
3 files changed, 16 insertions, 15 deletions
diff --git a/fs/filesystems.c b/fs/filesystems.c
index 0845f84f2a5f..96f24286667a 100644
--- a/fs/filesystems.c
+++ b/fs/filesystems.c
@@ -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)
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);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index e0bc4ffb8e7f..ed17e54fd204 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -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;