fs: remove mapping->backing_dev_info
Now that we never use the backing_dev_info pointer in struct address_space
we can simply remove it and save 4 to 8 bytes in every inode.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Reviewed-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 026ca7b..a9f9279 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -60,19 +60,6 @@
spin_unlock(&inode->i_lock);
}
-/*
- * Move the inode from its current bdi to a new bdi. Make sure the inode
- * is clean before moving so that it doesn't linger on the old bdi.
- */
-static void bdev_inode_switch_bdi(struct inode *inode,
- struct backing_dev_info *dst)
-{
- spin_lock(&inode->i_lock);
- WARN_ON_ONCE(inode->i_state & I_DIRTY);
- inode->i_data.backing_dev_info = dst;
- spin_unlock(&inode->i_lock);
-}
-
/* Kill _all_ buffers and pagecache , dirty or not.. */
void kill_bdev(struct block_device *bdev)
{
@@ -589,7 +576,6 @@
inode->i_bdev = bdev;
inode->i_data.a_ops = &def_blk_aops;
mapping_set_gfp_mask(&inode->i_data, GFP_USER);
- inode->i_data.backing_dev_info = &default_backing_dev_info;
spin_lock(&bdev_lock);
list_add(&bdev->bd_list, &all_bdevs);
spin_unlock(&bdev_lock);
@@ -1150,8 +1136,6 @@
bdev->bd_queue = disk->queue;
bdev->bd_contains = bdev;
if (!partno) {
- struct backing_dev_info *bdi;
-
ret = -ENXIO;
bdev->bd_part = disk_get_part(disk, partno);
if (!bdev->bd_part)
@@ -1177,11 +1161,8 @@
}
}
- if (!ret) {
+ if (!ret)
bd_set_size(bdev,(loff_t)get_capacity(disk)<<9);
- bdi = blk_get_backing_dev_info(bdev);
- bdev_inode_switch_bdi(bdev->bd_inode, bdi);
- }
/*
* If the device is invalidated, rescan partition
@@ -1208,8 +1189,6 @@
if (ret)
goto out_clear;
bdev->bd_contains = whole;
- bdev_inode_switch_bdi(bdev->bd_inode,
- whole->bd_inode->i_data.backing_dev_info);
bdev->bd_part = disk_get_part(disk, partno);
if (!(disk->flags & GENHD_FL_UP) ||
!bdev->bd_part || !bdev->bd_part->nr_sects) {
@@ -1249,7 +1228,6 @@
bdev->bd_disk = NULL;
bdev->bd_part = NULL;
bdev->bd_queue = NULL;
- bdev_inode_switch_bdi(bdev->bd_inode, &default_backing_dev_info);
if (bdev != bdev->bd_contains)
__blkdev_put(bdev->bd_contains, mode, 1);
bdev->bd_contains = NULL;
@@ -1474,8 +1452,6 @@
* dirty data before.
*/
bdev_write_inode(bdev->bd_inode);
- bdev_inode_switch_bdi(bdev->bd_inode,
- &default_backing_dev_info);
}
if (bdev->bd_contains == bdev) {
if (disk->fops->release)