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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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16
fs/fs-writeback.c
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@@ -78,22 +78,6 @@ int writeback_in_progress(struct backing_dev_info *bdi)
}
EXPORT_SYMBOL(writeback_in_progress);
struct backing_dev_info *inode_to_bdi(struct inode *inode)
{
struct super_block *sb;
if (!inode)
return &noop_backing_dev_info;
sb = inode->i_sb;
#ifdef CONFIG_BLOCK
if (sb_is_blkdev_sb(sb))
return blk_get_backing_dev_info(I_BDEV(inode));
#endif
return sb->s_bdi;
}
EXPORT_SYMBOL_GPL(inode_to_bdi);
static inline struct inode *wb_inode(struct list_head *head)
{
return list_entry(head, struct inode, i_wb_list);