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Commit 0ee5dc67 authored by Al Viro's avatar Al Viro
Browse files

btrfs: kill magical embedded struct superblock 



Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent fb408e6c

fs/btrfs/ctree.h

+1 −1
Original line number Diff line number Diff line
@@ -1219,7 +1219,7 @@ struct btrfs_root { 
	 * right now this just gets used so that a root has its own devid

	 * for stat.  It may be used for more later

	 */

	struct super_block anon_super;

	dev_t anon_dev;

};



struct btrfs_ioctl_defrag_range_args {

fs/btrfs/disk-io.c

+4 −11
Original line number Diff line number Diff line
@@ -1077,12 +1077,7 @@ static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, 
	init_completion(&root->kobj_unregister);

	root->defrag_running = 0;

	root->root_key.objectid = objectid;

	root->anon_super.s_root = NULL;

	root->anon_super.s_dev = 0;

	INIT_LIST_HEAD(&root->anon_super.s_list);

	INIT_LIST_HEAD(&root->anon_super.s_instances);

	init_rwsem(&root->anon_super.s_umount);



	root->anon_dev = 0;

	return 0;

}
@@ -1311,7 +1306,7 @@ struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, 
	spin_lock_init(&root->cache_lock);

	init_waitqueue_head(&root->cache_wait);



	ret = set_anon_super(&root->anon_super, NULL);

	ret = get_anon_bdev(&root->anon_dev);

	if (ret)

		goto fail;
@@ -2393,10 +2388,8 @@ static void free_fs_root(struct btrfs_root *root) 
{

	iput(root->cache_inode);

	WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));

	if (root->anon_super.s_dev) {

		down_write(&root->anon_super.s_umount);

		kill_anon_super(&root->anon_super);

	}

	if (root->anon_dev)

		free_anon_bdev(root->anon_dev);

	free_extent_buffer(root->node);

	free_extent_buffer(root->commit_root);

	kfree(root->free_ino_ctl);

fs/btrfs/inode.c

+1 −1
Original line number Diff line number Diff line
@@ -6900,7 +6900,7 @@ static int btrfs_getattr(struct vfsmount *mnt, 
{

	struct inode *inode = dentry->d_inode;

	generic_fillattr(inode, stat);

	stat->dev = BTRFS_I(inode)->root->anon_super.s_dev;

	stat->dev = BTRFS_I(inode)->root->anon_dev;

	stat->blksize = PAGE_CACHE_SIZE;

	stat->blocks = (inode_get_bytes(inode) +

			BTRFS_I(inode)->delalloc_bytes) >> 9;

fs/super.c

+23 −9
Original line number Diff line number Diff line
@@ -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;
@@ -720,24 +720,38 @@ 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);



EXPORT_SYMBOL(set_anon_super);



void kill_anon_super(struct super_block *sb)

void free_anon_bdev(dev_t dev)

{

	int slot = MINOR(sb->s_dev);



	generic_shutdown_super(sb);

	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)

{

	dev_t dev = sb->s_dev;

	generic_shutdown_super(sb);

	free_anon_bdev(dev);

}



EXPORT_SYMBOL(kill_anon_super);

include/linux/fs.h

+2 −0
Original line number Diff line number Diff line
@@ -1835,6 +1835,8 @@ void kill_litter_super(struct super_block *sb); 
void deactivate_super(struct super_block *sb);

void deactivate_locked_super(struct super_block *sb);

int set_anon_super(struct super_block *s, void *data);

int get_anon_bdev(dev_t *);

void free_anon_bdev(dev_t);

struct super_block *sget(struct file_system_type *type,

			int (*test)(struct super_block *,void *),

			int (*set)(struct super_block *,void *),