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block_dev: get bdev inode bdi directly from the block device 

Directly grab the backing_dev_info from the request_queue instead of
detouring through the address_space.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2015-01-14 10:42:34 +01:00 committed by Jens Axboe
parent 564f00f6c0
commit 495a276e1c
1 changed files with 3 additions and 3 deletions
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6
fs/fs-writeback.c
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@ -69,10 +69,10 @@ EXPORT_SYMBOL(writeback_in_progress);
static inline struct backing_dev_info *inode_to_bdi(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
#ifdef CONFIG_BLOCK
if (sb_is_blkdev_sb(sb))
return inode->i_mapping->backing_dev_info;
return blk_get_backing_dev_info(I_BDEV(inode));
#endif
return sb->s_bdi;
}