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Tue, 18 Mar 2025 17:15:49 -0700 (PDT) From: Joe Damato To: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, asml.silence@gmail.com, linux-fsdevel@vger.kernel.org, edumazet@google.com, pabeni@redhat.com, horms@kernel.org, linux-api@vger.kernel.org, linux-arch@vger.kernel.org, viro@zeniv.linux.org.uk, jack@suse.cz, kuba@kernel.org, shuah@kernel.org, sdf@fomichev.me, mingo@redhat.com, arnd@arndb.de, brauner@kernel.org, akpm@linux-foundation.org, tglx@linutronix.de, jolsa@kernel.org, linux-kselftest@vger.kernel.org, Joe Damato Subject: [RFC -next 08/10] fs: Add sendfile flags for sendfile2 Date: Wed, 19 Mar 2025 00:15:19 +0000 Message-ID: <20250319001521.53249-9-jdamato@fastly.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250319001521.53249-1-jdamato@fastly.com> References: <20250319001521.53249-1-jdamato@fastly.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add a default flag (SENDFILE_DEFAULT) and a flag for requesting zerocopy notifications (SENDFILE_ZC). do_sendfile is updated to pass through the corresponding splice flag to enable zerocopy notifications. Signed-off-by: Joe Damato --- fs/read_write.c | 5 +++++ include/linux/sendfile.h | 10 ++++++++++ 2 files changed, 15 insertions(+) create mode 100644 include/linux/sendfile.h diff --git a/fs/read_write.c b/fs/read_write.c index 057e5f37645d..e3929fd0f605 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include #include @@ -1360,6 +1361,10 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, retval = rw_verify_area(WRITE, fd_file(out), &out_pos, count); if (retval < 0) return retval; + + if (flags & SENDFILE_ZC) + fl |= SPLICE_F_ZC; + retval = do_splice_direct(fd_file(in), &pos, fd_file(out), &out_pos, count, fl); } else { diff --git a/include/linux/sendfile.h b/include/linux/sendfile.h new file mode 100644 index 000000000000..0bd3c76ea6f2 --- /dev/null +++ b/include/linux/sendfile.h @@ -0,0 +1,10 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef SENDFILE_H +#define SENDFILE_H + +#define SENDFILE_DEFAULT (0x1) /* normal sendfile */ +#define SENDFILE_ZC (0x2) /* sendfile which generates ZC notifications */ + +#define SENDFILE_ALL (SENDFILE_DEFAULT|SENDFILE_ZC) + +#endif