linux-ext4 - [PATCH 4/7] add llseek_nowait() for struct file

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Date:   Wed, 26 Jul 2023 18:26:00 +0800
From:   Hao Xu <hao.xu@...ux.dev>
To:     io-uring@...r.kernel.org, Jens Axboe <axboe@...nel.dk>
Cc:     Dominique Martinet <asmadeus@...ewreck.org>,
        Pavel Begunkov <asml.silence@...il.com>,
        Christian Brauner <brauner@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Stefan Roesch <shr@...com>, Clay Harris <bugs@...ycon.org>,
        Dave Chinner <david@...morbit.com>,
        "Darrick J . Wong" <djwong@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, Wanpeng Li <wanpengli@...cent.com>
Subject: [PATCH 4/7] add llseek_nowait() for struct file_operations

From: Hao Xu <howeyxu@...cent.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@...cent.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