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Commit 5c0d6b60 authored by Jan Kara's avatar Jan Kara Committed by Al Viro
Browse files

vfs: Create function for iterating over block devices 



Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent b3de6531

fs/block_dev.c

+36 −0
Original line number Diff line number Diff line
@@ -1710,3 +1710,39 @@ int __invalidate_device(struct block_device *bdev, bool kill_dirty) 
	return res;

}

EXPORT_SYMBOL(__invalidate_device);



void iterate_bdevs(void (*func)(struct block_device *, void *), void *arg)

{

	struct inode *inode, *old_inode = NULL;



	spin_lock(&inode_sb_list_lock);

	list_for_each_entry(inode, &blockdev_superblock->s_inodes, i_sb_list) {

		struct address_space *mapping = inode->i_mapping;



		spin_lock(&inode->i_lock);

		if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW) ||

		    mapping->nrpages == 0) {

			spin_unlock(&inode->i_lock);

			continue;

		}

		__iget(inode);

		spin_unlock(&inode->i_lock);

		spin_unlock(&inode_sb_list_lock);

		/*

		 * We hold a reference to 'inode' so it couldn't have been

		 * removed from s_inodes list while we dropped the

		 * inode_sb_list_lock.  We cannot iput the inode now as we can

		 * be holding the last reference and we cannot iput it under

		 * inode_sb_list_lock. So we keep the reference and iput it

		 * later.

		 */

		iput(old_inode);

		old_inode = inode;



		func(I_BDEV(inode), arg);



		spin_lock(&inode_sb_list_lock);

	}

	spin_unlock(&inode_sb_list_lock);

	iput(old_inode);

}

include/linux/fs.h

+5 −0
Original line number Diff line number Diff line
@@ -2102,6 +2102,7 @@ extern sector_t blkdev_max_block(struct block_device *bdev); 
extern void bd_forget(struct inode *inode);

extern void bdput(struct block_device *);

extern void invalidate_bdev(struct block_device *);

extern void iterate_bdevs(void (*)(struct block_device *, void *), void *);

extern int sync_blockdev(struct block_device *bdev);

extern void kill_bdev(struct block_device *);

extern struct super_block *freeze_bdev(struct block_device *);
@@ -2123,6 +2124,10 @@ static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) 
{

	return 0;

}



static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg)

{

}

#endif

extern int sync_filesystem(struct super_block *);

extern const struct file_operations def_blk_fops;