From 2f9f6221b9b9944e96c80455b469a6f0269c558b Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Sun, 24 Jan 2021 11:02:35 +0100 Subject: block: simplify submit_bio_checks a bit Merge a few checks for whole devices vs partitions to streamline the sanity checks. Signed-off-by: Christoph Hellwig Acked-by: Tejun Heo Signed-off-by: Jens Axboe --- block/blk-core.c | 39 ++++++++++++++------------------------- 1 file changed, 14 insertions(+), 25 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index a3a54cd86c9c..64f69022de96 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -692,9 +692,9 @@ static inline bool should_fail_request(struct block_device *part, #endif /* CONFIG_FAIL_MAKE_REQUEST */ -static inline bool bio_check_ro(struct bio *bio, struct block_device *part) +static inline bool bio_check_ro(struct bio *bio) { - if (op_is_write(bio_op(bio)) && bdev_read_only(part)) { + if (op_is_write(bio_op(bio)) && bdev_read_only(bio->bi_bdev)) { char b[BDEVNAME_SIZE]; if (op_is_flush(bio->bi_opf) && !bio_sectors(bio)) @@ -702,7 +702,7 @@ static inline bool bio_check_ro(struct bio *bio, struct block_device *part) WARN_ONCE(1, "Trying to write to read-only block-device %s (partno %d)\n", - bio_devname(bio, b), part->bd_partno); + bio_devname(bio, b), bio->bi_bdev->bd_partno); /* Older lvm-tools actually trigger this */ return false; } @@ -723,8 +723,9 @@ ALLOW_ERROR_INJECTION(should_fail_bio, ERRNO); * This may well happen - the kernel calls bread() without checking the size of * the device, e.g., when mounting a file system. */ -static inline int bio_check_eod(struct bio *bio, sector_t maxsector) +static inline int bio_check_eod(struct bio *bio) { + sector_t maxsector = bdev_nr_sectors(bio->bi_bdev); unsigned int nr_sectors = bio_sectors(bio); if (nr_sectors && maxsector && @@ -739,28 +740,20 @@ static inline int bio_check_eod(struct bio *bio, sector_t maxsector) /* * Remap block n of partition p to block n+start(p) of the disk. */ -static inline int blk_partition_remap(struct bio *bio) +static int blk_partition_remap(struct bio *bio) { struct block_device *p = bio->bi_bdev; - int ret = -EIO; if (unlikely(should_fail_request(p, bio->bi_iter.bi_size))) - goto out; - if (unlikely(bio_check_ro(bio, p))) - goto out; - + return -EIO; if (bio_sectors(bio)) { - if (bio_check_eod(bio, bdev_nr_sectors(p))) - goto out; bio->bi_iter.bi_sector += p->bd_start_sect; trace_block_bio_remap(bio, p->bd_dev, bio->bi_iter.bi_sector - p->bd_start_sect); } bio->bi_bdev = bdev_whole(p); - ret = 0; -out: - return ret; + return 0; } /* @@ -820,16 +813,12 @@ static noinline_for_stack bool submit_bio_checks(struct bio *bio) if (should_fail_bio(bio)) goto end_io; - - if (bio->bi_bdev->bd_partno) { - if (unlikely(blk_partition_remap(bio))) - goto end_io; - } else { - if (unlikely(bio_check_ro(bio, bdev_whole(bdev)))) - goto end_io; - if (unlikely(bio_check_eod(bio, get_capacity(bdev->bd_disk)))) - goto end_io; - } + if (unlikely(bio_check_ro(bio))) + goto end_io; + if (unlikely(bio_check_eod(bio))) + goto end_io; + if (bio->bi_bdev->bd_partno && unlikely(blk_partition_remap(bio))) + goto end_io; /* * Filter flush bio's early so that bio based drivers without flush -- cgit v1.2.3