linux-kernel - [PATCH 05/21] block: Add REQ

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230929102726.2985188-6-john.g.garry@oracle.com>
Date:   Fri, 29 Sep 2023 10:27:10 +0000
From:   John Garry <john.g.garry@...cle.com>
To:     axboe@...nel.dk, kbusch@...nel.org, hch@....de, sagi@...mberg.me,
        jejb@...ux.ibm.com, martin.petersen@...cle.com, djwong@...nel.org,
        viro@...iv.linux.org.uk, brauner@...nel.org,
        chandan.babu@...cle.com, dchinner@...hat.com
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, tytso@....edu, jbongio@...gle.com,
        linux-api@...r.kernel.org,
        Himanshu Madhani <himanshu.madhani@...cle.com>,
        John Garry <john.g.garry@...cle.com>
Subject: [PATCH 05/21] block: Add REQ_ATOMIC flag

From: Himanshu Madhani <himanshu.madhani@...cle.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@...cle.com>
Signed-off-by: John Garry <john.g.garry@...cle.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 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)
-- 
2.31.1