linux-ext4 - [PATCH v3 6/7] fs: introduce write-hint start point for in-kernel hints

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Date:   Fri, 29 Mar 2019 13:23:51 +0530
From:   Kanchan Joshi <joshi.k@...sung.com>
To:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org
Cc:     axboe@...com, prakash.v@...sung.com, anshul@...sung.com,
        joshiiitr@...il.com, Kanchan Joshi <joshi.k@...sung.com>
Subject: [PATCH v3 6/7] fs: introduce write-hint start point for in-kernel
 hints

kernel-mode components can define own write-hints using
"WRITE_LIFE_KERN_MIN" as base.

Signed-off-by: Kanchan Joshi <joshi.k@...sung.com>
---
 include/linux/fs.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 29d8e2c..6a2673e 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -291,6 +291,8 @@ enum rw_hint {
 	WRITE_LIFE_MEDIUM	= RWH_WRITE_LIFE_MEDIUM,
 	WRITE_LIFE_LONG		= RWH_WRITE_LIFE_LONG,
 	WRITE_LIFE_EXTREME	= RWH_WRITE_LIFE_EXTREME,
+/* Kernel should use write-hint starting from this */
+	WRITE_LIFE_KERN_MIN,
 };
 
 #define IOCB_EVENTFD		(1 << 0)
-- 
2.7.4