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From:   Hao Xu <hao.xu@linux.dev>
To:     io-uring@vger.kernel.org, Jens Axboe <axboe@kernel.dk>
Cc:     Dominique Martinet <asmadeus@codewreck.org>,
        Pavel Begunkov <asml.silence@gmail.com>,
        Christian Brauner <brauner@kernel.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Stefan Roesch <shr@fb.com>, Clay Harris <bugs@claycon.org>,
        Dave Chinner <david@fromorbit.com>,
        "Darrick J . Wong" <djwong@kernel.org>,
        linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org,
        linux-ext4@vger.kernel.org, Wanpeng Li <wanpengli@tencent.com>
Subject: [PATCH 4/7] add llseek_nowait() for struct file_operations
Date:   Wed, 26 Jul 2023 18:26:00 +0800
Message-Id: <20230726102603.155522-5-hao.xu@linux.dev>
In-Reply-To: <20230726102603.155522-1-hao.xu@linux.dev>
References: <20230726102603.155522-1-hao.xu@linux.dev>
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From: Hao Xu <howeyxu@tencent.com>

Add a new function member llseek_nowait() in struct file_operations for
nowait llseek. It act just like llseek() but has an extra boolean
parameter called nowait to indicate if it's a nowait try, avoid IO and
locks if so.

Signed-off-by: Hao Xu <howeyxu@tencent.com>
---
 include/linux/fs.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index f3e315e8efdd..d37290da2d7e 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1823,6 +1823,7 @@ struct file_operations {
 	int (*uring_cmd)(struct io_uring_cmd *ioucmd, unsigned int issue_flags);
 	int (*uring_cmd_iopoll)(struct io_uring_cmd *, struct io_comp_batch *,
 				unsigned int poll_flags);
+	loff_t (*llseek_nowait)(struct file *, loff_t, int, bool);
 } __randomize_layout;
 
 struct inode_operations {
-- 
2.25.1