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block: factor out a blk_write_zeroes_limit helper

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Contrary to the comment in __blkdev_issue_write_zeroes, nothing here
checks for a potential bi_size overflow.  Add a helper mirroring
the secure erase code for the check.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240701165219.1571322-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2024-07-01 18:51:15 +02:00 committed by Jens Axboe
parent 2f20872ed4
commit 73a768d5f9
1 changed files with 11 additions and 7 deletions
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18
block/blk-lib.c
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@ -103,24 +103,28 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
}
EXPORT_SYMBOL(blkdev_issue_discard);
static sector_t bio_write_zeroes_limit(struct block_device *bdev)
{
sector_t bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
return min(bdev_write_zeroes_sectors(bdev),
(UINT_MAX >> SECTOR_SHIFT) & ~bs_mask);
}
static int __blkdev_issue_write_zeroes(struct block_device *bdev,
sector_t sector, sector_t nr_sects, gfp_t gfp_mask,
struct bio **biop, unsigned flags)
{
struct bio *bio = *biop;
unsigned int max_sectors;
if (bdev_read_only(bdev))
return -EPERM;
/* Ensure that max_sectors doesn't overflow bi_size */
max_sectors = bdev_write_zeroes_sectors(bdev);
if (max_sectors == 0)
if (!bdev_write_zeroes_sectors(bdev))
return -EOPNOTSUPP;
while (nr_sects) {
unsigned int len = min_t(sector_t, nr_sects, max_sectors);
unsigned int len = min_t(sector_t, nr_sects,
bio_write_zeroes_limit(bdev));
bio = blk_next_bio(bio, bdev, 0, REQ_OP_WRITE_ZEROES, gfp_mask);
bio->bi_iter.bi_sector = sector;