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[05/21] block: Add REQ_ATOMIC flag

Message ID 20230929102726.2985188-6-john.g.garry@oracle.com (mailing list archive)
State New, archived
Headers show
Series block atomic writes | expand

Commit Message

John Garry Sept. 29, 2023, 10:27 a.m. UTC 
From: Himanshu Madhani <himanshu.madhani@oracle.com>

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.

Signed-off-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: John Garry <john.g.garry@oracle.com>
---
 include/linux/blk_types.h | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index d5c5e59ddbd2..4ef5ca64adb4 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -422,6 +422,7 @@  enum req_flag_bits {
 	__REQ_DRV,		/* for driver use */
 	__REQ_FS_PRIVATE,	/* for file system (submitter) use */
 
+	__REQ_ATOMIC,		/* for atomic write operations */
 	/*
 	 * Command specific flags, keep last:
 	 */
@@ -448,6 +449,7 @@  enum req_flag_bits {
 #define REQ_RAHEAD	(__force blk_opf_t)(1ULL << __REQ_RAHEAD)
 #define REQ_BACKGROUND	(__force blk_opf_t)(1ULL << __REQ_BACKGROUND)
 #define REQ_NOWAIT	(__force blk_opf_t)(1ULL << __REQ_NOWAIT)
+#define REQ_ATOMIC	(__force blk_opf_t)(1ULL << __REQ_ATOMIC)
 #define REQ_POLLED	(__force blk_opf_t)(1ULL << __REQ_POLLED)
 #define REQ_ALLOC_CACHE	(__force blk_opf_t)(1ULL << __REQ_ALLOC_CACHE)
 #define REQ_SWAP	(__force blk_opf_t)(1ULL << __REQ_SWAP)