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Commit c07e2b41 authored by Jens Axboe's avatar Jens Axboe
Browse files

block: factor our bio_check_eod() 



End of device check is done twice in __generic_make_request() and it's
fully inlined each time.  Factor out bio_check_eod().

Signed-off-by: default avatarTejun Heo <htejun@gmail.com>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent a0cd1285

block/ll_rw_blk.c

+33 −30
Original line number Diff line number Diff line
@@ -3120,6 +3120,35 @@ static inline int should_fail_request(struct bio *bio) 


#endif /* CONFIG_FAIL_MAKE_REQUEST */



/*

 * Check whether this bio extends beyond the end of the device.

 */

static inline int bio_check_eod(struct bio *bio, unsigned int nr_sectors)

{

	sector_t maxsector;



	if (!nr_sectors)

		return 0;



	/* Test device or partition size, when known. */

	maxsector = bio->bi_bdev->bd_inode->i_size >> 9;

	if (maxsector) {

		sector_t sector = bio->bi_sector;



		if (maxsector < nr_sectors || maxsector - nr_sectors < sector) {

			/*

			 * This may well happen - the kernel calls bread()

			 * without checking the size of the device, e.g., when

			 * mounting a device.

			 */

			handle_bad_sector(bio);

			return 1;

		}

	}



	return 0;

}



/**

 * generic_make_request: hand a buffer to its device driver for I/O

 * @bio:  The bio describing the location in memory and on the device.
@@ -3147,27 +3176,14 @@ static inline int should_fail_request(struct bio *bio) 
static inline void __generic_make_request(struct bio *bio)

{

	struct request_queue *q;

	sector_t maxsector;

	sector_t old_sector;

	int ret, nr_sectors = bio_sectors(bio);

	dev_t old_dev;



	might_sleep();

	/* Test device or partition size, when known. */

	maxsector = bio->bi_bdev->bd_inode->i_size >> 9;

	if (maxsector) {

		sector_t sector = bio->bi_sector;



		if (maxsector < nr_sectors || maxsector - nr_sectors < sector) {

			/*

			 * This may well happen - the kernel calls bread()

			 * without checking the size of the device, e.g., when

			 * mounting a device.

			 */

			handle_bad_sector(bio);

	if (bio_check_eod(bio, nr_sectors))

		goto end_io;

		}

	}



	/*

	 * Resolve the mapping until finished. (drivers are
@@ -3223,21 +3239,8 @@ static inline void __generic_make_request(struct bio *bio) 
		old_sector = bio->bi_sector;

		old_dev = bio->bi_bdev->bd_dev;



		maxsector = bio->bi_bdev->bd_inode->i_size >> 9;

		if (maxsector) {

			sector_t sector = bio->bi_sector;



			if (maxsector < nr_sectors ||

					maxsector - nr_sectors < sector) {

				/*

				 * This may well happen - partitions are not

				 * checked to make sure they are within the size

				 * of the whole device.

				 */

				handle_bad_sector(bio);

		if (bio_check_eod(bio, nr_sectors))

			goto end_io;

			}

		}



		ret = q->make_request_fn(q, bio);

	} while (ret);