[PATCH RFC 05/16] block: Add REQ_ATOMIC flag
From: John Garry <john.g.garry@oracle.com>
Date: 2023-05-03 18:40:36
Also in:
linux-block, linux-fsdevel, linux-nvme, linux-scsi, linux-xfs, lkml
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
From: Himanshu Madhani <redacted> Add flag REQ_ATOMIC, meaning an atomic operation. This should only be used in conjunction with REQ_OP_WRITE. We will not add a special "request atomic write" operation, as to try to avoid maintenance effort for an operation which is almost the same as REQ_OP_WRITE. This flag was originally proposed by Chris Mason for an atomic writes proposal some time ago. Signed-off-by: Himanshu Madhani <redacted> Signed-off-by: John Garry <john.g.garry@oracle.com> --- include/linux/blk_types.h | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 99be590f952f..347b52e00322 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h@@ -417,6 +417,7 @@ enum req_flag_bits { __REQ_SWAP, /* swap I/O */ __REQ_DRV, /* for driver use */ + __REQ_ATOMIC, /* for atomic write operations */ /* * Command specific flags, keep last: */
@@ -444,6 +445,7 @@ enum req_flag_bits { #define REQ_BACKGROUND (__force blk_opf_t)(1ULL << __REQ_BACKGROUND) #define REQ_NOWAIT (__force blk_opf_t)(1ULL << __REQ_NOWAIT) #define REQ_CGROUP_PUNT (__force blk_opf_t)(1ULL << __REQ_CGROUP_PUNT) +#define REQ_ATOMIC (__force blk_opf_t)(1ULL << __REQ_ATOMIC) #define REQ_NOUNMAP (__force blk_opf_t)(1ULL << __REQ_NOUNMAP) #define REQ_POLLED (__force blk_opf_t)(1ULL << __REQ_POLLED)
--
2.31.1