[PATCH 01/10] block: move secure erase checks into the ioctl handler

[Christoph Hellwig <hch@lst.de>]

Most bio operations get basic sanity checking in submit_bio and anything
more complicated than that is done in the callers.  Secure erase is a bit
different from that in that a lot of checking is done in
blkdev_issue_secure_erase, and the specific errnos for that are returned
to userspace.  Move the checks that require specific errnos to the ioctl
handler instead, and just leave the basic sanity checking in submit_bio

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 block/blk-lib.c | 7 -------
 block/ioctl.c   | 8 +++++++-
 2 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/block/blk-lib.c b/block/blk-lib.c
index 442da9dad04213..4aabfc4a7eaa20 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -299,13 +299,6 @@ int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,
 		max_sectors = UINT_MAX >> SECTOR_SHIFT;
 	max_sectors &= ~bs_mask;
 
-	if (max_sectors == 0)
-		return -EOPNOTSUPP;
-	if ((sector | nr_sects) & bs_mask)
-		return -EINVAL;
-	if (bdev_read_only(bdev))
-		return -EPERM;
-
 	blk_start_plug(&plug);
 	while (nr_sects) {
 		unsigned int len = min_t(sector_t, nr_sects, max_sectors);
diff --git a/block/ioctl.c b/block/ioctl.c
index d570e16958961e..f53121edb9a15f 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -163,6 +163,7 @@ static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode,
 static int blk_ioctl_secure_erase(struct block_device *bdev, blk_mode_t mode,
 		void __user *argp)
 {
+	unsigned int bs_mask = bdev_logical_block_size(bdev) - 1;
 	uint64_t start, len;
 	uint64_t range[2];
 	int err;
@@ -171,12 +172,17 @@ static int blk_ioctl_secure_erase(struct block_device *bdev, blk_mode_t mode,
 		return -EBADF;
 	if (!bdev_max_secure_erase_sectors(bdev))
 		return -EOPNOTSUPP;
+	if (bdev_read_only(bdev))
+		return -EPERM;
 	if (copy_from_user(range, argp, sizeof(range)))
 		return -EFAULT;
 
 	start = range[0];
 	len = range[1];
-	if ((start & 511) || (len & 511))
+
+	if (!len)
+ 		return -EINVAL;
+	if ((start | len) & bs_mask)
 		return -EINVAL;
 	if (start + len > bdev_nr_bytes(bdev))
 		return -EINVAL;
-- 
2.43.0