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[46.135.85.136]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-482e047d863sm125188435e9.1.2026.02.03.05.00.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Feb 2026 05:00:53 -0800 (PST) From: Mateusz Guzik To: viro@zeniv.linux.org.uk Cc: brauner@kernel.org, jack@suse.cz, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Mateusz Guzik Subject: [PATCH] fs: add porting notes about readlink_copy() Date: Tue, 3 Feb 2026 14:00:31 +0100 Message-ID: <20260203130032.315177-1-mjguzik@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Calling convention has changed in ea382199071931d1 ("vfs: support caching symlink lengths in inodes") Signed-off-by: Mateusz Guzik --- Documentation/filesystems/porting.rst | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/Documentation/filesystems/porting.rst b/Documentation/filesystems/porting.rst index 3397937ed838..bd4128ccbb67 100644 --- a/Documentation/filesystems/porting.rst +++ b/Documentation/filesystems/porting.rst @@ -1334,3 +1334,13 @@ end_creating() and the parent will be unlocked precisely when necessary. kill_litter_super() is gone; convert to DCACHE_PERSISTENT use (as all in-tree filesystems have done). + +--- + +**mandatory** + +readlink_copy() now requires link length as the 4th argument. Said length needs +to match what strlen() would return if it was ran on the string. + +However, if the string is freely accessible for the duration of inode's +lifetime, consider using inode_set_cached_link() instead. -- 2.43.0