Re: [PATCH v2 1/3] block: provide helpers for reading block count
On Thu, 23 Jun 2016, Arnd Bergmann wrote: Several drivers use an expensive do_div() to compute the number of logical or physical blocks in a blockdev, which can be done more efficiently using a shift, since the blocksize is always a power of two number. Let's introduce bdev_logical_block_count() and bdev_physical_block_count() helper functions mirroring the bdev_logical_block_size() and bdev_physical_block_size() interfaces for the block size. @@ -1226,6 +1226,13 @@ static inline unsigned short bdev_logical_block_size(struct block_device *bdev) return queue_logical_block_size(bdev_get_queue(bdev)); } +static inline sector_t bdev_logical_block_count(struct block_device *bdev) Curious, why not just return u64 instead for all these instead of sector_t (ie dealing with lba, it reads weird)? Thanks, Davidlohr -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH v2 1/3] block: provide helpers for reading block count
Looks good, for the series: Reviewed-by: Sagi Grimbeg -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH v2 1/3] block: provide helpers for reading block count
Thanks Arnd, the series looks fine to me: Reviewed-by: Christoph Hellwig -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
[PATCH v2 1/3] block: provide helpers for reading block count
Several drivers use an expensive do_div() to compute the number of logical or physical blocks in a blockdev, which can be done more efficiently using a shift, since the blocksize is always a power of two number. Let's introduce bdev_logical_block_count() and bdev_physical_block_count() helper functions mirroring the bdev_logical_block_size() and bdev_physical_block_size() interfaces for the block size. Signed-off-by: Arnd Bergmann Suggested-by: Christoph Hellwig --- include/linux/blkdev.h | 14 ++ 1 file changed, 14 insertions(+) diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 9d1e0a4650dc..ae8c408f6c22 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1226,6 +1226,13 @@ static inline unsigned short bdev_logical_block_size(struct block_device *bdev) return queue_logical_block_size(bdev_get_queue(bdev)); } +static inline sector_t bdev_logical_block_count(struct block_device *bdev) +{ + unsigned int block_shift = ilog2(bdev_logical_block_size(bdev)); + + return bdev->bd_inode->i_size >> block_shift; +} + static inline unsigned int queue_physical_block_size(struct request_queue *q) { return q->limits.physical_block_size; @@ -1236,6 +1243,13 @@ static inline unsigned int bdev_physical_block_size(struct block_device *bdev) return queue_physical_block_size(bdev_get_queue(bdev)); } +static inline sector_t bdev_physical_block_count(struct block_device *bdev) +{ + unsigned int block_shift = ilog2(bdev_physical_block_size(bdev)); + + return bdev->bd_inode->i_size >> block_shift; +} + static inline unsigned int queue_io_min(struct request_queue *q) { return q->limits.io_min; -- 2.9.0 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html