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Message-Id: <20230621152214.2720319-4-stsp2@yandex.ru>
Date: Wed, 21 Jun 2023 20:22:14 +0500
From: Stas Sergeev <stsp2@...dex.ru>
To: linux-kernel@...r.kernel.org
Cc: Stas Sergeev <stsp2@...dex.ru>, Jeff Layton <jlayton@...nel.org>,
Chuck Lever <chuck.lever@...cle.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>,
linux-fsdevel@...r.kernel.org, Shuah Khan <shuah@...nel.org>,
linux-kselftest@...r.kernel.org, linux-api@...r.kernel.org
Subject: [PATCH] fcntl.2: document F_UNLCK F_OFD_GETLK extension
F_UNLCK has the special meaning when used as a lock type on input.
It returns the information about any lock found in the specified
region on that particular file descriptor. Locks on other file
descriptors are ignored by F_UNLCK.
Signed-off-by: Stas Sergeev <stsp2@...dex.ru>
CC: Jeff Layton <jlayton@...nel.org>
CC: Chuck Lever <chuck.lever@...cle.com>
CC: Alexander Viro <viro@...iv.linux.org.uk>
CC: Christian Brauner <brauner@...nel.org>
CC: linux-fsdevel@...r.kernel.org
CC: linux-kernel@...r.kernel.org
CC: Shuah Khan <shuah@...nel.org>
CC: linux-kselftest@...r.kernel.org
CC: linux-api@...r.kernel.org
---
man2/fcntl.2 | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/man2/fcntl.2 b/man2/fcntl.2
index 7b5604e3a..e3e3e7b8c 100644
--- a/man2/fcntl.2
+++ b/man2/fcntl.2
@@ -604,6 +604,13 @@ then details about one of these locks are returned via
.IR lock ,
as described above for
.BR F_GETLK .
+.B F_UNLCK
+has the special meaning when put into
+.I l_type
+as an input. It returns the information about any lock in the specified
+range on that particular file descriptor. The locks on other file
+descriptors are ignored by
+.BR F_UNLCK .
.PP
In the current implementation,
.\" commit 57b65325fe34ec4c917bc4e555144b4a94d9e1f7
--
2.39.2
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