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io: Consolidate lockf implementation

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With internal fcntl64 internal (commit 06ab719d), it is possible to
consolidate lockf implementation by using the LFS fcntl interface
instead of using arch and system-specific implementations.

For Linux, the i386 implementation is used as generic implementation
by replacing the direct syscall with fcntl64 call.  The LFS symbol
alias for default LFS ABI (__OFF_T_MATCHES_OFF64_T) is used to avoid
the duplicate symbol (instead of overriding the implementation with an
empty file).

For Hurd lockf64 semantic is changed: previous generic lockf64
implementation returned EOVERFLOW if LEN input is larger than 32-bit
off_t.  However, Hurd fcntl64 implementation for F_GETLK64, F_SETLK64,
and F_SETLKW64 do accept off64_t inputs (__f_setlk accepts only off64_t
inputs).

Checked on i686-linux-gnu and x86_64-linux-gnu along with a i686-gnu
build.

	* io/Makefile (tests): Add tst-lockf.
	* io/lockf.c (lockf): Use __fcntl and only define for
	!__OFF_T_MATCHES_OFF64_T.
	* io/lockf64.c (__lockf64): Call __fcntl64 and alias to lockf for
	__OFF_T_MATCHES_OFF64_T case.
	* io/tst-lockf.c: New file.
	* sysdeps/unix/sysv/linux/i386/lockf64.c: Remove file.
	* sysdeps/unix/sysv/linux/arm/lockf64.c: Likewise.
	* sysdeps/unix/sysv/linux/m68k/lockf64.c: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/lockf64.c: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n32/lockf64.c: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/lockf64.c: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/lockf64.c: Likewise.
	* sysdeps/unix/sysv/linux/sh/lockf64.c: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/lockf64.c: Likewise.
This commit is contained in:
Adhemerval Zanella 2018-11-21 11:41:05 +00:00
parent bc10e22c90
commit e442e40de5
14 changed files with 194 additions and 161 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
ChangeLog
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@ -1,3 +1,21 @@
2019-02-15 Adhemerval Zanella <adhemerval.zanella@linaro.org>
* io/Makefile (tests): Add tst-lockf.
* io/lockf.c (lockf): Use __fcntl and only define for
!__OFF_T_MATCHES_OFF64_T.
* io/lockf64.c (__lockf64): Call __fcntl64 and alias to lockf for
__OFF_T_MATCHES_OFF64_T case.
* io/tst-lockf.c: New file.
* sysdeps/unix/sysv/linux/i386/lockf64.c: Remove file.
* sysdeps/unix/sysv/linux/arm/lockf64.c: Likewise.
* sysdeps/unix/sysv/linux/m68k/lockf64.c: Likewise.
* sysdeps/unix/sysv/linux/mips/mips32/lockf64.c: Likewise.
* sysdeps/unix/sysv/linux/mips/mips64/n32/lockf64.c: Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/lockf64.c: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/lockf64.c: Likewise.
* sysdeps/unix/sysv/linux/sh/lockf64.c: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/lockf64.c: Likewise.
2019-02-15 Florian Weimer <fweimer@redhat.com>
[BZ #24211]

2
io/Makefile
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@ -71,7 +71,7 @@ tests := test-utime test-stat test-stat2 test-lfs tst-getcwd \
tst-mknodat tst-mkfifoat tst-ttyname_r bug-ftw5 \
tst-posix_fallocate tst-posix_fallocate64 \
tst-fts tst-fts-lfs tst-open-tmpfile \
tst-copy_file_range tst-getcwd-abspath \
tst-copy_file_range tst-getcwd-abspath tst-lockf
# This test includes the compat implementation of copy_file_range,
# which uses internal, unexported libc functions.

54
io/lockf.c
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@ -15,34 +15,26 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
/* We need to avoid the header declaration of lockf64, because
the types don't match lockf and then the compiler will
complain about the mismatch when we do the alias below. */
#define lockf64 __renamed_lockf64
#ifndef __OFF_T_MATCHES_OFF64_T
#include <fcntl.h>
#undef lockf64
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
/* lockf is a simplified interface to fcntl's locking facilities. */
int
lockf (int fd, int cmd, off_t len)
{
struct flock fl;
memset ((char *) &fl, '\0', sizeof (fl));
/* lockf is always relative to the current file position. */
fl.l_whence = SEEK_CUR;
fl.l_start = 0;
fl.l_len = len;
struct flock fl = {
.l_type = F_WRLCK,
.l_whence = SEEK_CUR,
.l_len = len
};
/* lockf() is a cancellation point but so is fcntl() if F_SETLKW is
used. Therefore we don't have to care about cancellation here,
the fcntl() function will take care of it. */
switch (cmd)
{
case F_TEST:
@ -55,31 +47,15 @@ lockf (int fd, int cmd, off_t len)
return 0;
__set_errno (EACCES);
return -1;
case F_ULOCK:
fl.l_type = F_UNLCK;
cmd = F_SETLK;
break;
return __fcntl (fd, F_SETLK, &fl);
case F_LOCK:
fl.l_type = F_WRLCK;
cmd = F_SETLKW;
break;
return __fcntl (fd, F_SETLKW, &fl);
case F_TLOCK:
fl.l_type = F_WRLCK;
cmd = F_SETLK;
break;
default:
__set_errno (EINVAL);
return -1;
return __fcntl (fd, F_SETLK, &fl);
}
/* lockf() is a cancellation point but so is fcntl() if F_SETLKW is
used. Therefore we don't have to care about cancellation here,
the fcntl() function will take care of it. */
return __fcntl (fd, cmd, &fl);
__set_errno (EINVAL);
return -1;
}
#ifdef __OFF_T_MATCHES_OFF64_T
weak_alias (lockf, lockf64)
#endif

65
io/lockf64.c
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@ -15,69 +15,48 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
/* lockf.c defines lockf64 as an alias if __OFF_T_MATCHES_OFF64_T. */
#ifndef __OFF_T_MATCHES_OFF64_T
/* lockf is a simplified interface to fcntl's locking facilities. */
int
lockf64 (int fd, int cmd, off64_t len64)
__lockf64 (int fd, int cmd, off64_t len64)
{
struct flock fl;
off_t len = (off_t) len64;
if (len64 != (off64_t) len)
{
/* We can't represent the length. */
__set_errno (EOVERFLOW);
return -1;
}
memset ((char *) &fl, '\0', sizeof (fl));
/* lockf is always relative to the current file position. */
fl.l_whence = SEEK_CUR;
fl.l_start = 0;
fl.l_len = len;
struct flock64 fl64 = {
.l_type = F_WRLCK,
.l_whence = SEEK_CUR,
.l_len = len64,
};
/* lockf() is a cancellation point but so is fcntl() if F_SETLKW is
used. Therefore we don't have to care about cancellation here,
the fcntl() function will take care of it. */
switch (cmd)
{
case F_TEST:
/* Test the lock: return 0 if FD is unlocked or locked by this process;
return -1, set errno to EACCES, if another process holds the lock. */
fl.l_type = F_RDLCK;
if (__fcntl (fd, F_GETLK, &fl) < 0)
fl64.l_type = F_RDLCK;
if (__fcntl (fd, F_GETLK64, &fl64) < 0)
return -1;
if (fl.l_type == F_UNLCK || fl.l_pid == __getpid ())
return 0;
if (fl64.l_type == F_UNLCK || fl64.l_pid == __getpid ())
return 0;
__set_errno (EACCES);
return -1;
case F_ULOCK:
fl.l_type = F_UNLCK;
cmd = F_SETLK;
break;
fl64.l_type = F_UNLCK;
return __fcntl64 (fd, F_SETLK64, &fl64);
case F_LOCK:
fl.l_type = F_WRLCK;
cmd = F_SETLKW;
break;
return __fcntl64 (fd, F_SETLKW64, &fl64);
case F_TLOCK:
fl.l_type = F_WRLCK;
cmd = F_SETLK;
break;
default:
__set_errno (EINVAL);
return -1;
return __fcntl64 (fd, F_SETLK64, &fl64);
}
return __fcntl (fd, cmd, &fl);
__set_errno (EINVAL);
return -1;
}
weak_alias (__lockf64, lockf64)
#ifdef __OFF_T_MATCHES_OFF64_T
weak_alias (lockf64, lockf)
#endif

138
io/tst-lockf.c Normal file
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@ -0,0 +1,138 @@
/* Test POSIX lock on an open file (lockf).
Copyright (C) 2019 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <unistd.h>
#include <stdint.h>
#include <errno.h>
#include <stdio.h>
#include <support/temp_file.h>
#include <support/capture_subprocess.h>
#include <support/check.h>
static char *temp_filename;
static int temp_fd;
static void
do_prepare (int argc, char **argv)
{
temp_fd = create_temp_file ("tst-lockfd.", &temp_filename);
TEST_VERIFY_EXIT (temp_fd != -1);
}
#define PREPARE do_prepare
static void
do_test_child_lockf (void *closure)
{
/* Check if parent has [0, 1024) locked. */
TEST_COMPARE (lseek (temp_fd, 0, SEEK_SET), 0);
TEST_COMPARE (lockf (temp_fd, F_TLOCK, 1024), -1);
TEST_COMPARE (errno, EAGAIN);
TEST_COMPARE (lockf (temp_fd, F_TEST, 1024), -1);
TEST_COMPARE (errno, EACCES);
/* Also Check if parent has last 1024 bytes locked. */
TEST_COMPARE (lseek (temp_fd, INT32_MAX-1024, SEEK_SET), INT32_MAX-1024);
TEST_COMPARE (lockf (temp_fd, F_TEST, 1024), -1);
/* And try to lock [1024, 2048). */
TEST_COMPARE (lseek (temp_fd, 1024, SEEK_SET), 1024);
TEST_COMPARE (lockf (temp_fd, F_LOCK, 1024), 0);
/* Check if non-LFS interface cap access to 32-bif off_t. */
TEST_COMPARE (lseek64 (temp_fd, (off64_t)INT32_MAX, SEEK_SET),
(off64_t)INT32_MAX);
TEST_COMPARE (lockf64 (temp_fd, F_TEST, 1024), 0);
}
static void
do_test_child_lockf64 (void *closure)
{
/* Check if parent has [0, 1024) locked. */
TEST_COMPARE (lseek64 (temp_fd, 0, SEEK_SET), 0);
TEST_COMPARE (lockf64 (temp_fd, F_TLOCK, 1024), -1);
TEST_COMPARE (errno, EAGAIN);
TEST_COMPARE (lockf64 (temp_fd, F_TEST, 1024), -1);
TEST_COMPARE (errno, EACCES);
/* Also Check if parent has last 1024 bytes locked. */
TEST_COMPARE (lseek64 (temp_fd, INT32_MAX-1024, SEEK_SET), INT32_MAX-1024);
TEST_COMPARE (lockf64 (temp_fd, F_TEST, 1024), -1);
/* And try to lock [1024, 2048). */
TEST_COMPARE (lseek64 (temp_fd, 1024, SEEK_SET), 1024);
TEST_COMPARE (lockf64 (temp_fd, F_LOCK, 1024), 0);
/* And also [INT32_MAX, INT32_MAX+1024). */
{
off64_t off = (off64_t)INT32_MAX;
TEST_COMPARE (lseek64 (temp_fd, off, SEEK_SET), off);
TEST_COMPARE (lockf64 (temp_fd, F_LOCK, 1024), 0);
}
/* Check if [INT32_MAX+1024, INT64_MAX) is locked. */
{
off64_t off = (off64_t)INT32_MAX+1024;
TEST_COMPARE (lseek64 (temp_fd, off, SEEK_SET), off);
TEST_COMPARE (lockf64 (temp_fd, F_TLOCK, 1024), -1);
TEST_COMPARE (errno, EAGAIN);
TEST_COMPARE (lockf64 (temp_fd, F_TEST, 1024), -1);
TEST_COMPARE (errno, EACCES);
}
}
static int
do_test (void)
{
/* Basic tests to check if a lock can be obtained and checked. */
TEST_COMPARE (lockf (temp_fd, F_LOCK, 1024), 0);
TEST_COMPARE (lockf (temp_fd, F_LOCK, INT32_MAX), 0);
TEST_COMPARE (lockf (temp_fd, F_TLOCK, 1024), 0);
TEST_COMPARE (lockf (temp_fd, F_TEST, 1024), 0);
TEST_COMPARE (lseek (temp_fd, 1024, SEEK_SET), 1024);
TEST_COMPARE (lockf (temp_fd, F_ULOCK, 1024), 0);
/* Parent process should have ([0, 1024), [2048, INT32_MAX)) ranges locked. */
{
struct support_capture_subprocess result;
result = support_capture_subprocess (do_test_child_lockf, NULL);
support_capture_subprocess_check (&result, "lockf", 0, sc_allow_none);
}
if (sizeof (off_t) != sizeof (off64_t))
{
/* Check if previously locked regions with LFS symbol. */
TEST_COMPARE (lseek (temp_fd, 0, SEEK_SET), 0);
TEST_COMPARE (lockf64 (temp_fd, F_LOCK, 1024), 0);
TEST_COMPARE (lockf64 (temp_fd, F_TLOCK, 1024), 0);
TEST_COMPARE (lockf64 (temp_fd, F_TEST, 1024), 0);
/* Lock region [INT32_MAX+1024, INT64_MAX). */
off64_t off = (off64_t)INT32_MAX + 1024;
TEST_COMPARE (lseek64 (temp_fd, off, SEEK_SET), off);
TEST_COMPARE (lockf64 (temp_fd, F_LOCK, 1024), 0);
/* Parent process should have ([0, 1024), [2048, INT32_MAX),
[INT32_MAX+1024, INT64_MAX)) ranges locked. */
{
struct support_capture_subprocess result;
result = support_capture_subprocess (do_test_child_lockf64, NULL);
support_capture_subprocess_check (&result, "lockf", 0, sc_allow_none);
}
}
return 0;
}
#include <support/test-driver.c>

1
sysdeps/unix/sysv/linux/arm/lockf64.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/lockf64.c>

70
sysdeps/unix/sysv/linux/i386/lockf64.c
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@ -1,70 +0,0 @@
/* Copyright (C) 1994-2019 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/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <sysdep.h>
/* lockf is a simplified interface to fcntl's locking facilities. */
int
lockf64 (int fd, int cmd, off64_t len64)
{
struct flock64 fl64;
int cmd64;
int result;
memset ((char *) &fl64, '\0', sizeof (fl64));
fl64.l_whence = SEEK_CUR;
fl64.l_start = 0;
fl64.l_len = len64;
switch (cmd)
{
case F_TEST:
/* Test the lock: return 0 if FD is unlocked or locked by this process;
return -1, set errno to EACCES, if another process holds the lock. */
fl64.l_type = F_RDLCK;
INTERNAL_SYSCALL_DECL (err);
result = INTERNAL_SYSCALL (fcntl64, err, 3, fd, F_GETLK64, &fl64);
if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (result, err)))
return INLINE_SYSCALL_ERROR_RETURN_VALUE (INTERNAL_SYSCALL_ERRNO (result,
err));
if (fl64.l_type == F_UNLCK || fl64.l_pid == __getpid ())
return 0;
return INLINE_SYSCALL_ERROR_RETURN_VALUE (EACCES);
case F_ULOCK:
fl64.l_type = F_UNLCK;
cmd64 = F_SETLK64;
break;
case F_LOCK:
fl64.l_type = F_WRLCK;
cmd64 = F_SETLKW64;
break;
case F_TLOCK:
fl64.l_type = F_WRLCK;
cmd64 = F_SETLK64;
break;
default:
return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
}
return INLINE_SYSCALL (fcntl64, 3, fd, cmd64, &fl64);
}

1
sysdeps/unix/sysv/linux/m68k/lockf64.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/lockf64.c>

1
sysdeps/unix/sysv/linux/mips/mips32/lockf64.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/lockf64.c>

1
sysdeps/unix/sysv/linux/mips/mips64/n32/lockf64.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/lockf64.c>

1
sysdeps/unix/sysv/linux/powerpc/powerpc32/lockf64.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/lockf64.c>

1
sysdeps/unix/sysv/linux/s390/s390-32/lockf64.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/lockf64.c>

1
sysdeps/unix/sysv/linux/sh/lockf64.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/lockf64.c>

1
sysdeps/unix/sysv/linux/sparc/sparc32/lockf64.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/lockf64.c>