[PATCH v2 7/7] block: implement async secure erase

[Pavel Begunkov <asml.silence@gmail.com>]

Add yet another io_uring cmd implementing async secure erases.
It has same page cache races as async discards and write zeroes and
reuses the common paths in general.

Suggested-by: Conrad Meyer <conradmeyer@meta.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 block/ioctl.c           | 15 +++++++++++++++
 include/uapi/linux/fs.h |  1 +
 2 files changed, 16 insertions(+)

diff --git a/block/ioctl.c b/block/ioctl.c
index 6f0676f21e7b..ab8bab6ee806 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -841,6 +841,18 @@ static int blkdev_cmd_write_zeroes(struct io_uring_cmd *cmd,
 				bdev_write_zeroes_sectors(bdev), opf);
 }
 
+static int blkdev_cmd_secure_erase(struct io_uring_cmd *cmd,
+				   struct block_device *bdev,
+				   uint64_t start, uint64_t len, bool nowait)
+{
+	blk_opf_t opf = REQ_OP_SECURE_ERASE;
+
+	if (nowait)
+		opf |= REQ_NOWAIT;
+	return blkdev_queue_cmd(cmd, bdev, start, len,
+				bdev_max_secure_erase_sectors(bdev), opf);
+}
+
 static int blkdev_cmd_discard(struct io_uring_cmd *cmd,
 			      struct block_device *bdev,
 			      uint64_t start, uint64_t len, bool nowait)
@@ -911,6 +923,9 @@ int blkdev_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags)
 	case BLOCK_URING_CMD_WRITE_ZEROES:
 		return blkdev_cmd_write_zeroes(cmd, bdev, start, len,
 					       bc->nowait);
+	case BLOCK_URING_CMD_SECURE_ERASE:
+		return blkdev_cmd_secure_erase(cmd, bdev, start, len,
+					       bc->nowait);
 	}
 	return -EINVAL;
 }
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index b9e20ce57a28..425957589bdf 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -210,6 +210,7 @@ struct fsxattr {
 
 #define BLOCK_URING_CMD_DISCARD			0
 #define BLOCK_URING_CMD_WRITE_ZEROES		1
+#define BLOCK_URING_CMD_SECURE_ERASE		2
 
 #define BMAP_IOCTL 1		/* obsolete - kept for compatibility */
 #define FIBMAP	   _IO(0x00,1)	/* bmap access */
-- 
2.45.2