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bdi: make inode_to_bdi() inline

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Now that bdi definitions are moved to backing-dev-defs.h,
backing-dev.h can include blkdev.h and inline inode_to_bdi() without
worrying about introducing circular include dependency.  The function
gets called from hot paths and fairly trivial.

This patch makes inode_to_bdi() and sb_is_blkdev_sb() that the
function calls inline.  blockdev_superblock and noop_backing_dev_info
are EXPORT_GPL'd to allow the inline functions to be used from
modules.

While at it, make sb_is_blkdev_sb() return bool instead of int.

v2: Fixed typo in description as suggested by Jan.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Tejun Heo 2015-05-22 17:13:33 -04:00 • committed by Jens Axboe
parent 66114cad64
commit a212b105b0
5 changed files with 26 additions and 25 deletions
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8
fs/block_dev.c
View file

@ -547,7 +547,8 @@ static struct file_system_type bd_type = {
.kill_sb = kill_anon_super,
};
static struct super_block *blockdev_superblock __read_mostly;
struct super_block *blockdev_superblock __read_mostly;
EXPORT_SYMBOL_GPL(blockdev_superblock);
void __init bdev_cache_init(void)
{
@ -688,11 +689,6 @@ static struct block_device *bd_acquire(struct inode *inode)
return bdev;
}
int sb_is_blkdev_sb(struct super_block *sb)
{
return sb == blockdev_superblock;
}
/* Call when you free inode */
void bd_forget(struct inode *inode)