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[PATCH] lockdep: annotate ->s_lock

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Teach special (per-filesystem) locking code to the lock validator.

Minimal effect on non-lockdep kernels: one extra parameter to alloc_super().

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar 2006-07-03 00:25:27 -07:00 committed by Linus Torvalds
parent 91ebe2a932
commit cf51624999
2 changed files with 9 additions and 2 deletions
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10
fs/super.c
View file

@ -53,7 +53,7 @@ DEFINE_SPINLOCK(sb_lock);
* Allocates and initializes a new &struct super_block. alloc_super()
* returns a pointer new superblock or %NULL if allocation had failed.
*/
static struct super_block *alloc_super(void)
static struct super_block *alloc_super(struct file_system_type *type)
{
struct super_block *s = kzalloc(sizeof(struct super_block), GFP_USER);
static struct super_operations default_op;
@ -72,6 +72,12 @@ static struct super_block *alloc_super(void)
INIT_LIST_HEAD(&s->s_inodes);
init_rwsem(&s->s_umount);
mutex_init(&s->s_lock);
/*
* The locking rules for s_lock are up to the
* filesystem. For example ext3fs has different
* lock ordering than usbfs:
*/
lockdep_set_class(&s->s_lock, &type->s_lock_key);
down_write(&s->s_umount);
s->s_count = S_BIAS;
atomic_set(&s->s_active, 1);
@ -295,7 +301,7 @@ retry:
}
if (!s) {
spin_unlock(&sb_lock);
s = alloc_super();
s = alloc_super(type);
if (!s)
return ERR_PTR(-ENOMEM);
goto retry;

1
include/linux/fs.h
View file

@ -1295,6 +1295,7 @@ struct file_system_type {
struct module *owner;
struct file_system_type * next;
struct list_head fs_supers;
struct lock_class_key s_lock_key;
};
extern int get_sb_bdev(struct file_system_type *fs_type,