[PATCH 10/10] block: fold bdev_unhash_inode into invalidate_partition

Christoph Hellwig
2020-04-14T07:29:36Z

invalidate_partition and bdev_unhash_inode are always paired, and
invalidate_partition already does an icache lookup for the block device
inode. Piggy back on that to remove the inode from the hash.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
block/genhd.c | 8 ++++++--
fs/block_dev.c | 15 ---------------
include/linux/fs.h | 1 -
3 files changed, 6 insertions(+), 18 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 980a4609d4a5..c05d509877fa 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -888,6 +888,12 @@ static void invalidate_partition(struct gendisk *disk, int partno)

fsync_bdev(bdev);
__invalidate_device(bdev, true);
+
+ /*
+ * Unhash the bdev inode for this device so that it gets evicted as soon
+ * as last inode reference is dropped.
+ */
+ remove_inode_hash(bdev->bd_inode);
bdput(bdev);
}

@@ -909,13 +915,11 @@ void del_gendisk(struct gendisk *disk)
DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
while ((part = disk_part_iter_next(&piter))) {
invalidate_partition(disk, part->partno);
- bdev_unhash_inode(part_devt(part));
delete_partition(disk, part);
}
disk_part_iter_exit(&piter);

invalidate_partition(disk, 0);
- bdev_unhash_inode(disk_devt(disk));
set_capacity(disk, 0);
disk->flags &= ~GENHD_FL_UP;
up_write(&disk->lookup_sem);
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 9c8de54fa0c9..998820174d3e 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -883,21 +883,6 @@ static int bdev_set(struct inode *inode, void *data)

static LIST_HEAD(all_bdevs);

-/*
- * If there is a bdev inode for this device, unhash it so that it gets evicted
- * as soon as last inode reference is dropped.
- */
-void bdev_unhash_inode(dev_t dev)
-{
- struct inode *inode;
-
- inode = ilookup5(blockdev_superblock, hash(dev), bdev_test, &dev);
- if (inode) {
- remove_inode_hash(inode);
- iput(inode);
- }
-}
-
struct block_device *bdget(dev_t dev)
{
struct block_device *bdev;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 2b4e9f86b151..1a95e5158811 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2581,7 +2581,6 @@ extern struct kmem_cache *names_cachep;
#ifdef CONFIG_BLOCK
extern int register_blkdev(unsigned int, const char *);
extern void unregister_blkdev(unsigned int, const char *);
-extern void bdev_unhash_inode(dev_t dev);
extern struct block_device *bdget(dev_t);
extern struct block_device *bdgrab(struct block_device *bdev);
extern void bd_set_size(struct block_device *, loff_t size);
--
2.25.1