diff mbox

[2/3] block: require write_same and discard requests align to logical block size

Message ID 146612626092.12764.773833541076937471.stgit@birch.djwong.org (mailing list archive)
State New, archived
Headers show

Commit Message

Darrick J. Wong June 17, 2016, 1:17 a.m. UTC 
Make sure that the offset and length arguments that we're using to
construct WRITE SAME and DISCARD requests are actually aligned to the
logical block size.  Failure to do this causes other errors in other
parts of the block layer or the SCSI layer because disks don't support
partial logical block writes.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 block/blk-lib.c |   15 +++++++++++++++
 1 file changed, 15 insertions(+)



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Comments

Bart Van Assche June 20, 2016, 12:37 p.m. UTC | #1 
On 06/17/2016 03:19 AM, Darrick J. Wong wrote:
> Make sure that the offset and length arguments that we're using to
> construct WRITE SAME and DISCARD requests are actually aligned to the
> logical block size.  Failure to do this causes other errors in other
> parts of the block layer or the SCSI layer because disks don't support
> partial logical block writes.
>
> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>

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Martin K. Petersen June 29, 2016, 4:58 a.m. UTC | #2 
>>>>> "Darrick" == Darrick J Wong <darrick.wong@oracle.com> writes:

Darrick> Make sure that the offset and length arguments that we're using
Darrick> to construct WRITE SAME and DISCARD requests are actually
Darrick> aligned to the logical block size.  Failure to do this causes
Darrick> other errors in other parts of the block layer or the SCSI
Darrick> layer because disks don't support partial logical block writes.

Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
diff mbox

Patch

diff --git a/block/blk-lib.c b/block/blk-lib.c
index 9e29dc3..012aa98 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -29,6 +29,7 @@  int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
 	struct bio *bio = *biop;
 	unsigned int granularity;
 	int alignment;
+	sector_t bs_mask;
 
 	if (!q)
 		return -ENXIO;
@@ -37,6 +38,10 @@  int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
 	if ((type & REQ_SECURE) && !blk_queue_secdiscard(q))
 		return -EOPNOTSUPP;
 
+	bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
+	if ((sector | nr_sects) & bs_mask)
+		return -EINVAL;
+
 	/* Zero-sector (unknown) and one-sector granularities are the same.  */
 	granularity = max(q->limits.discard_granularity >> 9, 1U);
 	alignment = (bdev_discard_alignment(bdev) >> 9) % granularity;
@@ -140,10 +145,15 @@  int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
 	unsigned int max_write_same_sectors;
 	struct bio *bio = NULL;
 	int ret = 0;
+	sector_t bs_mask;
 
 	if (!q)
 		return -ENXIO;
 
+	bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
+	if ((sector | nr_sects) & bs_mask)
+		return -EINVAL;
+
 	/* Ensure that max_write_same_sectors doesn't overflow bi_size */
 	max_write_same_sectors = UINT_MAX >> 9;
 
@@ -191,6 +201,11 @@  static int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
 	int ret;
 	struct bio *bio = NULL;
 	unsigned int sz;
+	sector_t bs_mask;
+
+	bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
+	if ((sector | nr_sects) & bs_mask)
+		return -EINVAL;
 
 	while (nr_sects != 0) {
 		bio = next_bio(bio, WRITE,