From 612c6aa7817f1c89b6a92fc724331aa7c9d77f6e Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 9 Nov 2020 17:52:02 +0100 Subject: [PATCH] block: change the hash used for looking up block devices Adding the minor to the major creates tons of pointless conflicts. Just use the dev_t itself, which is 32-bits and thus is guaranteed to fit into ino_t. Signed-off-by: Christoph Hellwig Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jan Kara Reviewed-by: Hannes Reinecke Acked-by: Tejun Heo Signed-off-by: Jens Axboe --- fs/block_dev.c | 26 ++------------------------ 1 file changed, 2 insertions(+), 24 deletions(-) diff --git a/fs/block_dev.c b/fs/block_dev.c index c5755150c6be..d707ab376da8 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -863,35 +863,12 @@ void __init bdev_cache_init(void) blockdev_superblock = bd_mnt->mnt_sb; /* For writeback */ } -/* - * Most likely _very_ bad one - but then it's hardly critical for small - * /dev and can be fixed when somebody will need really large one. - * Keep in mind that it will be fed through icache hash function too. - */ -static inline unsigned long hash(dev_t dev) -{ - return MAJOR(dev)+MINOR(dev); -} - -static int bdev_test(struct inode *inode, void *data) -{ - return BDEV_I(inode)->bdev.bd_dev == *(dev_t *)data; -} - -static int bdev_set(struct inode *inode, void *data) -{ - BDEV_I(inode)->bdev.bd_dev = *(dev_t *)data; - return 0; -} - static struct block_device *bdget(dev_t dev) { struct block_device *bdev; struct inode *inode; - inode = iget5_locked(blockdev_superblock, hash(dev), - bdev_test, bdev_set, &dev); - + inode = iget_locked(blockdev_superblock, dev); if (!inode) return NULL; @@ -903,6 +880,7 @@ static struct block_device *bdget(dev_t dev) bdev->bd_super = NULL; bdev->bd_inode = inode; bdev->bd_part_count = 0; + bdev->bd_dev = dev; inode->i_mode = S_IFBLK; inode->i_rdev = dev; inode->i_bdev = bdev; -- 2.11.0