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-rw-r--r--block/blk-lib.c23
1 files changed, 18 insertions, 5 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c
index e8caecd71688..3fe0aec90597 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -261,6 +261,19 @@ static int __blkdev_issue_write_zeroes(struct block_device *bdev,
return 0;
}
+/*
+ * Convert a number of 512B sectors to a number of pages.
+ * The result is limited to a number of pages that can fit into a BIO.
+ * Also make sure that the result is always at least 1 (page) for the cases
+ * where nr_sects is lower than the number of sectors in a page.
+ */
+static unsigned int __blkdev_sectors_to_bio_pages(sector_t nr_sects)
+{
+ sector_t bytes = (nr_sects << 9) + PAGE_SIZE - 1;
+
+ return min(bytes >> PAGE_SHIFT, (sector_t)BIO_MAX_PAGES);
+}
+
/**
* __blkdev_issue_zeroout - generate number of zero filed write bios
* @bdev: blockdev to issue
@@ -307,18 +320,18 @@ int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
ret = 0;
while (nr_sects != 0) {
- bio = next_bio(bio, min(nr_sects, (sector_t)BIO_MAX_PAGES),
- gfp_mask);
+ bio = next_bio(bio, __blkdev_sectors_to_bio_pages(nr_sects),
+ gfp_mask);
bio->bi_iter.bi_sector = sector;
bio->bi_bdev = bdev;
bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
while (nr_sects != 0) {
- sz = min((sector_t) PAGE_SIZE >> 9 , nr_sects);
- bi_size = bio_add_page(bio, ZERO_PAGE(0), sz << 9, 0);
+ sz = min((sector_t) PAGE_SIZE, nr_sects << 9);
+ bi_size = bio_add_page(bio, ZERO_PAGE(0), sz, 0);
nr_sects -= bi_size >> 9;
sector += bi_size >> 9;
- if (bi_size < (sz << 9))
+ if (bi_size < sz)
break;
}
cond_resched();