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Fix p{readv,writev}{64} consolidation implementation

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This patch fixes the p{readv,writev}{64} consolidation implementation
from commits 4e77815 and af5fdf5.  Different from pread/pwrite
implementation, preadv/pwritev implementation does not require
__ALIGNMENT_ARG because kernel syscall prototypes define
the high and low part of the off_t, if it is the case, directly
(different from pread/pwrite where the architecture ABI for passing
64-bit values must be in consideration for passsing the arguments).

It also adds some basic tests for preadv/pwritev.

Tested on x86_64, i686, and armhf.

	* misc/Makefile (tests): Add tst-preadvwritev and tst-preadvwritev64.
	* misc/tst-preadvwritev.c: New file.
	* misc/tst-preadvwritev64.c: Likewise.
	* sysdeps/unix/sysv/linux/preadv.c (preadv): Remove SYSCALL_LL{64}
	usage.
	* sysdeps/unix/sysv/linux/preadv64.c (preadv64): Likewise.
	* sysdeps/unix/sysv/linux/pwritev.c (pwritev): Likewise.
	* sysdeps/unix/sysv/linux/pwritev64.c (pwritev64): Likewise.
	* sysdeps/unix/sysv/linux/sysdep.h (LO_HI_LONG): New macro.
This commit is contained in:
Adhemerval Zanella 2016-06-14 17:56:33 -03:00
parent df2258c6cb
commit 4751bbe2ad
9 changed files with 168 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
ChangeLog
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@ -1,3 +1,15 @@
2016-06-21 Adhemerval Zanella <adhemerval.zanella@linaro.org>
* misc/Makefile (tests): Add tst-preadvwritev and tst-preadvwritev64.
* misc/tst-preadvwritev.c: New file.
* misc/tst-preadvwritev64.c: Likewise.
* sysdeps/unix/sysv/linux/preadv.c (preadv): Remove SYSCALL_LL{64}
usage.
* sysdeps/unix/sysv/linux/preadv64.c (preadv64): Likewise.
* sysdeps/unix/sysv/linux/pwritev.c (pwritev): Likewise.
* sysdeps/unix/sysv/linux/pwritev64.c (pwritev64): Likewise.
* sysdeps/unix/sysv/linux/sysdep.h (LO_HI_LONG): New macro.
2016-06-20 Andrew Senkevich <andrew.senkevich@intel.com>
[BZ #19654]

3
misc/Makefile
View File

@ -77,7 +77,8 @@ gpl2lgpl := error.c error.h
tests := tst-dirname tst-tsearch tst-fdset tst-efgcvt tst-mntent tst-hsearch \
tst-error1 tst-pselect tst-insremque tst-mntent2 bug-hsearch1 \
tst-mntent-blank-corrupt tst-mntent-blank-passno bug18240
tst-mntent-blank-corrupt tst-mntent-blank-passno bug18240 \
tst-preadvwritev tst-preadvwritev64
ifeq ($(run-built-tests),yes)
tests-special += $(objpfx)tst-error1-mem.out
endif

114
misc/tst-preadvwritev.c Normal file
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@ -0,0 +1,114 @@
/* Tests for preadv and pwritev.
Copyright (C) 2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <sys/uio.h>
/* Allow testing of the 64-bit versions as well. */
#ifndef PREADV
# define PREADV preadv
# define PWRITEV pwritev
#endif
static void do_prepare (void);
static int do_test (void);
#define PREPARE(argc, argv) do_prepare ()
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
static char *temp_filename;
static int temp_fd;
void
do_prepare (void)
{
temp_fd = create_temp_file ("tst-PREADVwritev.", &temp_filename);
if (temp_fd == -1)
{
printf ("cannot create temporary file: %m\n");
exit (1);
}
}
#define FAIL(str) \
do { printf ("error: %s (line %d)\n", str, __LINE__); return 1; } while (0)
int
do_test (void)
{
struct iovec iov[2];
ssize_t ret;
char buf1[32];
char buf2[64];
memset (buf1, 0xf0, sizeof buf1);
memset (buf2, 0x0f, sizeof buf2);
memset (iov, 0, sizeof iov);
iov[0].iov_base = buf1;
iov[0].iov_len = sizeof buf1;
iov[1].iov_base = buf2;
iov[1].iov_len = sizeof buf2;
ret = PWRITEV (temp_fd, iov, 2, 0);
if (ret == -1)
FAIL ("first PWRITEV returned -1");
if (ret != (sizeof buf1 + sizeof buf2))
FAIL ("first PWRITEV returned an unexpected value");
ret = PWRITEV (temp_fd, iov, 2, sizeof buf1 + sizeof buf2);
if (ret == -1)
FAIL ("second PWRITEV returned -1");
if (ret != (sizeof buf1 + sizeof buf2))
FAIL ("second PWRITEV returned an unexpected value");
char buf3[32];
char buf4[64];
memset (buf3, 0x0f, sizeof buf3);
memset (buf4, 0xf0, sizeof buf4);
iov[0].iov_base = buf3;
iov[0].iov_len = sizeof buf3;
iov[1].iov_base = buf4;
iov[1].iov_len = sizeof buf4;
ret = PREADV (temp_fd, iov, 2, 0);
if (ret == -1)
FAIL ("first PREADV returned -1");
if (ret != (sizeof buf3 + sizeof buf4))
FAIL ("first PREADV returned an unexpected value");
if (memcmp (buf1, buf3, sizeof buf1) != 0)
FAIL ("first buffer from first PREADV different than expected");
if (memcmp (buf2, buf4, sizeof buf2) != 0)
FAIL ("second buffer from first PREADV different than expected");
ret = PREADV (temp_fd, iov, 2, sizeof buf3 + sizeof buf4);
if (ret == -1)
FAIL ("second PREADV returned -1");
if (ret != (sizeof buf3 + sizeof buf4))
FAIL ("second PREADV returned an unexpected value");
if (memcmp (buf1, buf3, sizeof buf1) != 0)
FAIL ("first buffer from second PREADV different than expected");
if (memcmp (buf2, buf4, sizeof buf2) != 0)
FAIL ("second buffer from second PREADV different than expected");
return 0;
}

22
misc/tst-preadvwritev64.c Normal file
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@ -0,0 +1,22 @@
/* Tests for pread64 and pwrite64.
Copyright (C) 2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#define PREADV preadv64
#define PWRITEV pwritev64
#include "tst-preadvwritev.c"

5
sysdeps/unix/sysv/linux/preadv.c
View File

@ -29,8 +29,7 @@
ssize_t
preadv (int fd, const struct iovec *vector, int count, off_t offset)
{
return SYSCALL_CANCEL (preadv, fd, vector, count,
__ALIGNMENT_ARG SYSCALL_LL (offset));
return SYSCALL_CANCEL (preadv, fd, vector, count, LO_HI_LONG (offset));
}
# else
static ssize_t __atomic_preadv_replacement (int, const struct iovec *,
@ -40,7 +39,7 @@ preadv (int fd, const struct iovec *vector, int count, off_t offset)
{
# ifdef __NR_preadv
ssize_t result = SYSCALL_CANCEL (preadv, fd, vector, count,
__ALIGNMENT_ARG SYSCALL_LL (offset));
LO_HI_LONG (offset));
if (result >= 0 || errno != ENOSYS)
return result;
# endif

5
sysdeps/unix/sysv/linux/preadv64.c
View File

@ -27,8 +27,7 @@
ssize_t
preadv64 (int fd, const struct iovec *vector, int count, off64_t offset)
{
return SYSCALL_CANCEL (preadv64, fd, vector, count,
__ALIGNMENT_ARG SYSCALL_LL64 (offset));
return SYSCALL_CANCEL (preadv64, fd, vector, count, LO_HI_LONG (offset));
}
#else
static ssize_t __atomic_preadv64_replacement (int, const struct iovec *,
@ -38,7 +37,7 @@ preadv64 (int fd, const struct iovec *vector, int count, off64_t offset)
{
#ifdef __NR_preadv64
ssize_t result = SYSCALL_CANCEL (preadv64, fd, vector, count,
__ALIGNMENT_ARG SYSCALL_LL64 (offset));
LO_HI_LONG (offset));
if (result >= 0 || errno != ENOSYS)
return result;
#endif

5
sysdeps/unix/sysv/linux/pwritev.c
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@ -29,8 +29,7 @@
ssize_t
pwritev (int fd, const struct iovec *vector, int count, off_t offset)
{
return SYSCALL_CANCEL (pwritev, fd, vector, count,
__ALIGNMENT_ARG SYSCALL_LL (offset));
return SYSCALL_CANCEL (pwritev, fd, vector, count, LO_HI_LONG (offset));
}
# else
static ssize_t __atomic_pwritev_replacement (int, const struct iovec *,
@ -40,7 +39,7 @@ pwritev (int fd, const struct iovec *vector, int count, off_t offset)
{
# ifdef __NR_pwritev
ssize_t result = SYSCALL_CANCEL (pwritev, fd, vector, count,
__ALIGNMENT_ARG SYSCALL_LL (offset));
LO_HI_LONG (offset));
if (result >= 0 || errno != ENOSYS)
return result;
# endif

7
sysdeps/unix/sysv/linux/pwritev64.c
View File

@ -27,8 +27,7 @@
ssize_t
pwritev64 (int fd, const struct iovec *vector, int count, off64_t offset)
{
return SYSCALL_CANCEL (pwritev64, fd, vector, count,
__ALIGNMENT_ARG SYSCALL_LL64 (offset));
return SYSCALL_CANCEL (pwritev64, fd, vector, count, LO_HI_LONG (offset));
}
#else
static ssize_t __atomic_pwritev64_replacement (int, const struct iovec *,
@ -36,9 +35,9 @@ static ssize_t __atomic_pwritev64_replacement (int, const struct iovec *,
ssize_t
pwritev64 (int fd, const struct iovec *vector, int count, off64_t offset)
{
#ifdef __NR_pwrite64v
#ifdef __NR_pwritev64
ssize_t result = SYSCALL_CANCEL (pwritev64, fd, vector, count,
__ALIGNMENT_ARG SYSCALL_LL64 (offset));
LO_HI_LONG (offset));
if (result >= 0 || errno != ENOSYS)
return result;
#endif

9
sysdeps/unix/sysv/linux/sysdep.h
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@ -47,3 +47,12 @@
#define SYSCALL_LL64(val) \
__LONG_LONG_PAIR ((long) ((val) >> 32), (long) ((val) & 0xffffffff))
#endif
/* Provide a macro to pass the off{64}_t argument on p{readv,writev}{64}. */
#if __WORDSIZE == 64 || defined __ASSUME_WORDSIZE64_ILP32
# define LO_HI_LONG(val) (val)
#else
# define LO_HI_LONG(val) \
(long) (val), \
(long) (((uint64_t) (val)) >> 32)
#endif