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btrfs: kill magical embedded struct superblock

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2011-07-07 15:44:25 -04:00
parent fb408e6ccc
commit 0ee5dc676a
5 changed files with 32 additions and 23 deletions
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34
fs/super.c
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@@ -693,7 +693,7 @@ static DEFINE_IDA(unnamed_dev_ida);
static DEFINE_SPINLOCK(unnamed_dev_lock);/* protects the above */
static int unnamed_dev_start = 0; /* don't bother trying below it */
int set_anon_super(struct super_block *s, void *data)
int get_anon_bdev(dev_t *p)
{
int dev;
int error;
@@ -720,23 +720,37 @@ int set_anon_super(struct super_block *s, void *data)
spin_unlock(&unnamed_dev_lock);
return -EMFILE;
}
s->s_dev = MKDEV(0, dev & MINORMASK);
s->s_bdi = &noop_backing_dev_info;
*p = MKDEV(0, dev & MINORMASK);
return 0;
}
EXPORT_SYMBOL(get_anon_bdev);
void free_anon_bdev(dev_t dev)
{
int slot = MINOR(dev);
spin_lock(&unnamed_dev_lock);
ida_remove(&unnamed_dev_ida, slot);
if (slot < unnamed_dev_start)
unnamed_dev_start = slot;
spin_unlock(&unnamed_dev_lock);
}
EXPORT_SYMBOL(free_anon_bdev);
int set_anon_super(struct super_block *s, void *data)
{
int error = get_anon_bdev(&s->s_dev);
if (!error)
s->s_bdi = &noop_backing_dev_info;
return error;
}
EXPORT_SYMBOL(set_anon_super);
void kill_anon_super(struct super_block *sb)
{
int slot = MINOR(sb->s_dev);
dev_t dev = sb->s_dev;
generic_shutdown_super(sb);
spin_lock(&unnamed_dev_lock);
ida_remove(&unnamed_dev_ida, slot);
if (slot < unnamed_dev_start)
unnamed_dev_start = slot;
spin_unlock(&unnamed_dev_lock);
free_anon_bdev(dev);
}
EXPORT_SYMBOL(kill_anon_super);