[PATCH 2/3] aio: add support for zone-append

[Kanchan Joshi <joshi.k@samsung.com>]

Introduce IOCB_CMD_ZONE_APPEND opcode for zone-append. On append
completion zone-relative offset is returned using io_event->res2.

Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Signed-off-by: Arnav Dawn <a.dawn@samsung.com>
Signed-off-by: SelvaKumar S <selvakuma.s1@samsung.com>
Signed-off-by: Nitesh Shetty <nj.shetty@samsung.com>
Signed-off-by: Javier Gonzalez <javier.gonz@samsung.com>
---
 fs/aio.c                     | 8 ++++++++
 include/uapi/linux/aio_abi.h | 1 +
 2 files changed, 9 insertions(+)

diff --git a/fs/aio.c b/fs/aio.c
index 7ecddc2..8b10a55d 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1579,6 +1579,10 @@ static int aio_write(struct kiocb *req, const struct iocb *iocb,
 			__sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, true);
 			__sb_writers_release(file_inode(file)->i_sb, SB_FREEZE_WRITE);
 		}
+#ifdef CONFIG_BLK_DEV_ZONED
+		if (iocb->aio_lio_opcode == IOCB_CMD_ZONE_APPEND)
+			req->ki_flags |= IOCB_ZONE_APPEND;
+#endif
 		req->ki_flags |= IOCB_WRITE;
 		aio_rw_done(req, call_write_iter(file, req, &iter));
 	}
@@ -1846,6 +1850,10 @@ static int __io_submit_one(struct kioctx *ctx, const struct iocb *iocb,
 		return aio_fsync(&req->fsync, iocb, true);
 	case IOCB_CMD_POLL:
 		return aio_poll(req, iocb);
+#ifdef CONFIG_BLK_DEV_ZONED
+	case IOCB_CMD_ZONE_APPEND:
+		return aio_write(&req->rw, iocb, false, compat);
+#endif
 	default:
 		pr_debug("invalid aio operation %d\n", iocb->aio_lio_opcode);
 		return -EINVAL;
diff --git a/include/uapi/linux/aio_abi.h b/include/uapi/linux/aio_abi.h
index 8387e0a..541d96a 100644
--- a/include/uapi/linux/aio_abi.h
+++ b/include/uapi/linux/aio_abi.h
@@ -43,6 +43,7 @@ enum {
 	IOCB_CMD_NOOP = 6,
 	IOCB_CMD_PREADV = 7,
 	IOCB_CMD_PWRITEV = 8,
+	IOCB_CMD_ZONE_APPEND = 9,
 };
 
 /*
-- 
2.7.4