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authorIngo Molnar <mingo@elte.hu>2006-07-03 07:25:27 (GMT)
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-03 22:27:09 (GMT)
commitcf51624999e56c88154b5f7d451a265db6aabff7 (patch)
treeeee3fd290f9d79b26c4b6a2f1041f596da896a3c /fs
parent91ebe2a9320db7195d1e25152b5d158fc66dc133 (diff)
[PATCH] lockdep: annotate ->s_lock
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/super.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/super.c b/fs/super.c
index 9b780c4..5a4fe8b 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -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;

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