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[114.145.5.195]) by smtp.googlemail.com with ESMTPSA id 98e67ed59e1d1-35fd3203a55sm2179600a91.14.2026.04.15.07.32.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Apr 2026 07:32:43 -0700 (PDT) From: Daniel Palmer To: w@1wt.eu, linux@weissschuh.net Cc: linux-kernel@vger.kernel.org, Daniel Palmer Subject: [PATCH 1/2] tools/nolibc: fcntl: Add fallocate() Date: Wed, 15 Apr 2026 23:32:24 +0900 Message-ID: <20260415143225.561998-2-daniel@thingy.jp> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260415143225.561998-1-daniel@thingy.jp> References: <20260415143225.561998-1-daniel@thingy.jp> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add fallocate(), some special care is needed to put the offset and size into the syscall parameters for 32bit machines and for x32. Signed-off-by: Daniel Palmer --- tools/include/nolibc/fcntl.h | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/tools/include/nolibc/fcntl.h b/tools/include/nolibc/fcntl.h index ed2f5553c65a..0ebfdb7bc792 100644 --- a/tools/include/nolibc/fcntl.h +++ b/tools/include/nolibc/fcntl.h @@ -66,4 +66,34 @@ int open(const char *path, int flags, ...) return __sysret(_sys_open(path, flags, mode)); } =20 +/* + * int fallocate(int fd, int mode, off_t offset, off_t size); + */ + +#define __NOLIBC_LLARGPART(_arg, _part) \ + (((union { long long ll; long l[2]; }) { .ll =3D _arg }).l[_part]) + +static __attribute__((unused)) +int sys_fallocate(int fd, int mode, off_t offset, off_t size) +{ +#if defined(__x86_64__) && defined(__ILP32__) + const bool offsetsz_two_args =3D false; +#else + const bool offsetsz_two_args =3D sizeof(long) !=3D sizeof(off_t); +#endif + + if (offsetsz_two_args) + return __nolibc_syscall6(__NR_fallocate, fd, mode, + __NOLIBC_LLARGPART(offset, 0), __NOLIBC_LLARGPART(offset, 1), + __NOLIBC_LLARGPART(size, 0), __NOLIBC_LLARGPART(size, 1)); + else + return __nolibc_syscall4(__NR_fallocate, fd, mode, offset, size); +} + +static __attribute__((unused)) +int fallocate(int fd, int mode, off_t offset, off_t size) +{ + return __sysret(sys_fallocate(fd, mode, offset, size)); +} + #endif /* _NOLIBC_FCNTL_H */ --=20 2.51.0 From nobody Tue Jun 16 02:34:53 2026 Received: from mail-pg1-f174.google.com (mail-pg1-f174.google.com [209.85.215.174]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AE5503A3E99 for ; Wed, 15 Apr 2026 14:32:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.174 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776263567; cv=none; b=T73OKkgwJbrRP57zH4M85RHsK/FTzPhXmAAcEcUwLOqEAktRfy/4uHNFF7kHhKJz70/d+U25msAvWdKICJZxrhsuO603sM8n33xVJN+a7Bgw7G4WcbaEjqgmnzPGL/nPKZxNSPXsPeqfgTyccJ9QGnw7yV3iLC+f4nx/A0Yima8= ARC-Message-Signature: i=1; a=rsa-sha256; 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[114.145.5.195]) by smtp.googlemail.com with ESMTPSA id 98e67ed59e1d1-35fd3203a55sm2179600a91.14.2026.04.15.07.32.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Apr 2026 07:32:44 -0700 (PDT) From: Daniel Palmer To: w@1wt.eu, linux@weissschuh.net Cc: linux-kernel@vger.kernel.org, Daniel Palmer Subject: [PATCH 2/2] selftests/nolibc: Add a very basic test for fallocate() Date: Wed, 15 Apr 2026 23:32:25 +0900 Message-ID: <20260415143225.561998-3-daniel@thingy.jp> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260415143225.561998-1-daniel@thingy.jp> References: <20260415143225.561998-1-daniel@thingy.jp> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Create a tmp file, fallocate() to make it a bit bigger, check the size is what was expected. Signed-off-by: Daniel Palmer --- tools/testing/selftests/nolibc/nolibc-test.c | 33 ++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/s= elftests/nolibc/nolibc-test.c index d3c4facb54c0..066f436561e7 100644 --- a/tools/testing/selftests/nolibc/nolibc-test.c +++ b/tools/testing/selftests/nolibc/nolibc-test.c @@ -896,6 +896,38 @@ int test_getpagesize(void) return !c; } =20 +int test_fallocate(void) +{ + struct stat st; + int fd, r; + + /* Create a new tmp file */ + fd =3D open("/tmp", O_TMPFILE | O_RDWR, 0644); + if (fd =3D=3D -1) + return -1; + + /* Expand it to 42 bytes */ + r =3D fallocate(fd, 0, 0, 42); + if (r) + goto close_tmpfile; + + /* Get the new stat */ + r =3D fstat(fd, &st); + if (r) + goto close_tmpfile; + + /* It should be 42 bytes long */ + if (st.st_size !=3D 42) { + r =3D -1; + goto close_tmpfile; + } + +close_tmpfile: + close(fd); + + return r; +} + int test_file_stream(void) { FILE *f; @@ -1442,6 +1474,7 @@ int run_syscall(int min, int max) CASE_TEST(dup3_0); tmp =3D dup3(0, 100, 0); EXPECT_SYSNE(1, = tmp, -1); close(tmp); break; CASE_TEST(dup3_m1); tmp =3D dup3(-1, 100, 0); EXPECT_SYSER(1, = tmp, -1, EBADF); if (tmp !=3D -1) close(tmp); break; CASE_TEST(execve_root); EXPECT_SYSER(1, execve("/", (char*[]){ [0]= =3D "/", [1] =3D NULL }, NULL), -1, EACCES); break; + CASE_TEST(fallocate); EXPECT_SYSZR(1, test_fallocate()); break; CASE_TEST(fchdir_stdin); EXPECT_SYSER(1, fchdir(STDIN_FILENO), -1, = ENOTDIR); break; CASE_TEST(fchdir_badfd); EXPECT_SYSER(1, fchdir(-1), -1, EBADF); br= eak; CASE_TEST(file_stream); EXPECT_SYSZR(1, test_file_stream()); break; --=20 2.51.0