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authorChristoph Hellwig <hch@lst.de>2022-04-15 06:52:57 +0200
committerJens Axboe <axboe@kernel.dk>2022-04-17 19:49:59 -0600
commit44abff2c0b970ae3d310b97617525dc01f248d7c (patch)
tree9a1df22b92f1b310de70804605325b2367dfd52e /block/blk-lib.c
parent7b47ef52d0a2025fd1408a8a0990933b8e1e510f (diff)
block: decouple REQ_OP_SECURE_ERASE from REQ_OP_DISCARD
Secure erase is a very different operation from discard in that it is a data integrity operation vs hint. Fully split the limits and helper infrastructure to make the separation more clear. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Acked-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com> [drbd] Acked-by: Ryusuke Konishi <konishi.ryusuke@gmail.com> [nifs2] Acked-by: Jaegeuk Kim <jaegeuk@kernel.org> [f2fs] Acked-by: Coly Li <colyli@suse.de> [bcache] Acked-by: David Sterba <dsterba@suse.com> [btrfs] Acked-by: Chao Yu <chao@kernel.org> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Link: https://lore.kernel.org/r/20220415045258.199825-27-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-lib.c')
-rw-r--r--block/blk-lib.c64
1 files changed, 45 insertions, 19 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c
index 43aa4d7fe859..09b7e1200c0f 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -36,26 +36,15 @@ static sector_t bio_discard_limit(struct block_device *bdev, sector_t sector)
}
int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
- sector_t nr_sects, gfp_t gfp_mask, int flags,
- struct bio **biop)
+ sector_t nr_sects, gfp_t gfp_mask, struct bio **biop)
{
- struct request_queue *q = bdev_get_queue(bdev);
struct bio *bio = *biop;
- unsigned int op;
sector_t bs_mask;
if (bdev_read_only(bdev))
return -EPERM;
-
- if (flags & BLKDEV_DISCARD_SECURE) {
- if (!blk_queue_secure_erase(q))
- return -EOPNOTSUPP;
- op = REQ_OP_SECURE_ERASE;
- } else {
- if (!bdev_max_discard_sectors(bdev))
- return -EOPNOTSUPP;
- op = REQ_OP_DISCARD;
- }
+ if (!bdev_max_discard_sectors(bdev))
+ return -EOPNOTSUPP;
/* In case the discard granularity isn't set by buggy device driver */
if (WARN_ON_ONCE(!bdev_discard_granularity(bdev))) {
@@ -77,7 +66,7 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
sector_t req_sects =
min(nr_sects, bio_discard_limit(bdev, sector));
- bio = blk_next_bio(bio, bdev, 0, op, gfp_mask);
+ bio = blk_next_bio(bio, bdev, 0, REQ_OP_DISCARD, gfp_mask);
bio->bi_iter.bi_sector = sector;
bio->bi_iter.bi_size = req_sects << 9;
sector += req_sects;
@@ -103,21 +92,19 @@ EXPORT_SYMBOL(__blkdev_issue_discard);
* @sector: start sector
* @nr_sects: number of sectors to discard
* @gfp_mask: memory allocation flags (for bio_alloc)
- * @flags: BLKDEV_DISCARD_* flags to control behaviour
*
* Description:
* Issue a discard request for the sectors in question.
*/
int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
- sector_t nr_sects, gfp_t gfp_mask, unsigned long flags)
+ sector_t nr_sects, gfp_t gfp_mask)
{
struct bio *bio = NULL;
struct blk_plug plug;
int ret;
blk_start_plug(&plug);
- ret = __blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask, flags,
- &bio);
+ ret = __blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask, &bio);
if (!ret && bio) {
ret = submit_bio_wait(bio);
if (ret == -EOPNOTSUPP)
@@ -314,3 +301,42 @@ retry:
return ret;
}
EXPORT_SYMBOL(blkdev_issue_zeroout);
+
+int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,
+ sector_t nr_sects, gfp_t gfp)
+{
+ sector_t bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
+ unsigned int max_sectors = bdev_max_secure_erase_sectors(bdev);
+ struct bio *bio = NULL;
+ struct blk_plug plug;
+ int ret = 0;
+
+ 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);
+ for (;;) {
+ unsigned int len = min_t(sector_t, nr_sects, max_sectors);
+
+ bio = blk_next_bio(bio, bdev, 0, REQ_OP_SECURE_ERASE, gfp);
+ bio->bi_iter.bi_sector = sector;
+ bio->bi_iter.bi_size = len;
+
+ sector += len << SECTOR_SHIFT;
+ nr_sects -= len << SECTOR_SHIFT;
+ if (!nr_sects) {
+ ret = submit_bio_wait(bio);
+ bio_put(bio);
+ break;
+ }
+ cond_resched();
+ }
+ blk_finish_plug(&plug);
+
+ return ret;
+}
+EXPORT_SYMBOL(blkdev_issue_secure_erase);