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);
/*
* Drop a superblock's refcount. The caller must hold sb_lock.
*/
-void __put_super(struct super_block *sb)
+static void __put_super(struct super_block *sb)
{
if (!--sb->s_count) {
list_del_init(&sb->s_list);
* Drops a temporary reference, frees superblock if there's no
* references left.
*/
-void put_super(struct super_block *sb)
+static void put_super(struct super_block *sb)
{
spin_lock(&sb_lock);
__put_super(sb);
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;
}
spin_unlock(&sb_lock);
if (down_read_trylock(&sb->s_umount)) {
- if (sb->s_root)
+ if (sb->s_root && (sb->s_flags & MS_BORN))
return true;
up_read(&sb->s_umount);
}
}
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);
}
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))
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);
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++;
spin_unlock(&sb_lock);
down_read(&sb->s_umount);
- if (sb->s_root && sb->s_dirt)
+ if (sb->s_root && sb->s_dirt && (sb->s_flags & MS_BORN))
sb->s_op->write_super(sb);
up_read(&sb->s_umount);
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);
down_read(&sb->s_umount);
- if (sb->s_root)
+ if (sb->s_root && (sb->s_flags & MS_BORN))
f(sb, arg);
up_read(&sb->s_umount);
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);
down_read(&sb->s_umount);
- if (sb->s_root)
+ if (sb->s_root && (sb->s_flags & MS_BORN))
f(sb, arg);
up_read(&sb->s_umount);
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++;
spin_unlock(&sb_lock);
down_read(&sb->s_umount);
/* still alive? */
- if (sb->s_root)
+ if (sb->s_root && (sb->s_flags & MS_BORN))
return sb;
up_read(&sb->s_umount);
/* nope, got unmounted */
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 */
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++;
spin_unlock(&sb_lock);
down_read(&sb->s_umount);
/* still alive? */
- if (sb->s_root)
+ if (sb->s_root && (sb->s_flags & MS_BORN))
return sb;
up_read(&sb->s_umount);
/* nope, got unmounted */
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);
down_write(&sb->s_umount);
- if (sb->s_root && sb->s_bdev && !(sb->s_flags & MS_RDONLY)) {
+ if (sb->s_root && sb->s_bdev && (sb->s_flags & MS_BORN) &&
+ !(sb->s_flags & MS_RDONLY)) {
/*
* What lock protects sb->s_flags??
*/
return -EBUSY;
}
+ if (!(sb->s_flags & MS_BORN)) {
+ up_write(&sb->s_umount);
+ return 0; /* sic - it's "nothing to do" */
+ }
+
if (sb->s_flags & MS_RDONLY) {
sb->s_frozen = SB_FREEZE_TRANS;
smp_wmb();