Commit 3a4174e6 authored Nov 27, 2020 by Christoph Hellwig Committed by Jens Axboe Dec 01, 2020

block: switch bdgrab to use igrab



All of the current callers already have a reference, but to prepare for
additional users ensure bdgrab returns NULL if the block device is being
freed.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent 612c6aa7

fs/block_dev.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -894,10 +894,14 @@ static struct block_device *bdget(dev_t dev)
		/**
		* bdgrab -- Grab a reference to an already referenced block device
		* @bdev: Block device to grab a reference to.
		*
		* Returns the block_device with an additional reference when successful,
		* or NULL if the inode is already beeing freed.
		*/
		struct block_device bdgrab(struct block_device bdev)
		{
		ihold(bdev->bd_inode);
		if (!igrab(bdev->bd_inode))
		return NULL;
		return bdev;
		}
		EXPORT_SYMBOL(bdgrab);

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