Reply-To: foma3@hotmail.com
Hi.
You need comment? I have some for you:
----------------------------------------------------------------------
#if 0
/* old: */
#define MOUNT_SEMUTEX_IS_MUTEX yes
#undef MOUNT_SEMUTEX_IS_SEMAPHORE
#else
/* new: */
#undef MOUNT_SEMUTEX_IS_MUTEX
#define MOUNT_SEMUTEX_IS_SEMAPHORE yes
#endif
----------------------------------------------------------------------
#ifdef MOUNT_SEMUTEX_IS_MUTEX
#ifdef MOUNT_SEMUTEX_IS_SEMAPHORE
#error "both defined"
#else
#define INIT_MOUNT_SEMUTEX(x) mutex_init(&x->bd_mount_mutex)
#define LOCK_MOUNT_SEMUTEX(x) mutex_lock(&x->bd_mount_mutex)
#define UNLOCK_MOUNT_SEMUTEX(x) mutex_unlock(&x->bd_mount_mutex)
#endif
#else
#ifdef MOUNT_SEMUTEX_IS_SEMAPHORE
#define INIT_MOUNT_SEMUTEX(x) sema_init(&x->bd_mount_sem, 1)
#define LOCK_MOUNT_SEMUTEX(x) down(&x->bd_mount_sem)
#define UNLOCK_MOUNT_SEMUTEX(x) up(&x->bd_mount_sem)
#else
#error "none defined"
#endif
#endif
----------------------------------------------------------------------
{
memset(bdev, 0, sizeof(*bdev));
mutex_init(&bdev->bd_mutex);
-- mutex_init(&bdev->bd_mount_mutex);
-+ sema_init(&bdev->bd_mount_sem, 1);
++ INIT_MOUNT_SEMUTEX(bdev);
INIT_LIST_HEAD(&bdev->bd_inodes);
INIT_LIST_HEAD(&bdev->bd_list);
#ifdef CONFIG_SYSFS
----------------------------------------------------------------------
{
struct super_block *sb;
-- mutex_lock(&bdev->bd_mount_mutex);
-+ down(&bdev->bd_mount_sem);
++ LOCK_MOUNT_SEMUTEX(bdev);
sb = get_super(bdev);
if (sb && !(sb->s_flags & MS_RDONLY)) {
sb->s_frozen = SB_FREEZE_WRITE;
----------------------------------------------------------------------
drop_super(sb);
}
-- mutex_unlock(&bdev->bd_mount_mutex);
-+ up(&bdev->bd_mount_sem);
++ UNLOCK_MOUNT_SEMUTEX(bdev);
}
EXPORT_SYMBOL(thaw_bdev);
----------------------------------------------------------------------
* will protect the lockfs code from trying to start a snapshot
* while we are mounting
*/
-- mutex_lock(&bdev->bd_mount_mutex);
-+ down(&bdev->bd_mount_sem);
++ LOCK_MOUNT_SEMUTEX(bdev);
s = sget(fs_type, test_bdev_super, set_bdev_super, bdev);
-- mutex_unlock(&bdev->bd_mount_mutex);
-+ up(&bdev->bd_mount_sem);
++ UNLOCK_MOUNT_SEMUTEX(bdev);
if (IS_ERR(s))
goto error_s;
----------------------------------------------------------------------
struct inode * bd_inode; /* will die */
int bd_openers;
struct mutex bd_mutex; /* open/close mutex */
-- struct mutex bd_mount_mutex; /* mount mutex */
-+ struct semaphore bd_mount_sem;
++#ifdef MOUNT_SEMUTEX_IS_MUTEX
++ struct mutex bd_mount_mutex; /* mount mutex */
++#endif
++#ifdef MOUNT_SEMUTEX_IS_SEMAPHORE
++ struct semaphore bd_mount_sem;
++#endif
struct list_head bd_inodes;
void * bd_holder;
int bd_holders;
----------------------------------------------------------------------
The End.
2007-01-03T06:20:00+0000 foma@pc.somewhere.over.the.ru
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