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block: Add bio_max_segs

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It's often inconvenient to use BIO_MAX_PAGES due to min() requiring the
sign to be the same.  Introduce bio_max_segs() and change BIO_MAX_PAGES to
be unsigned to make it easier for the users.

Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Matthew Wilcox (Oracle)
2021-01-29 04:38:57 +00:00
committed by Jens Axboe
parent 94d4bffdda
commit 5f7136db82
20 changed files with 44 additions and 52 deletions
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4
drivers/md/dm-io.c
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@@ -341,8 +341,8 @@ static void do_region(int op, int op_flags, unsigned region,
num_bvecs = 1;
break;
default:
num_bvecs = min_t(int, BIO_MAX_PAGES,
dm_sector_div_up(remaining, (PAGE_SIZE >> SECTOR_SHIFT)));
num_bvecs = bio_max_segs(dm_sector_div_up(remaining,
(PAGE_SIZE >> SECTOR_SHIFT)));
}
bio = bio_alloc_bioset(GFP_NOIO, num_bvecs, &io->client->bios);