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osdep: Fall back to posix lock when OFD lock is unavailable 

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng 2017-05-03 00:35:55 +08:00 committed by Kevin Wolf
parent 13461fdba6
commit e8c1094a0e
1 changed files with 10 additions and 10 deletions
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20
util/osdep.c
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@ -38,6 +38,14 @@ extern int madvise(caddr_t, size_t, int);
#include "qemu/error-report.h"
#include "monitor/monitor.h"
#ifdef F_OFD_SETLK
#define QEMU_SETLK F_OFD_SETLK
#define QEMU_GETLK F_OFD_GETLK
#else
#define QEMU_SETLK F_SETLK
#define QEMU_GETLK F_GETLK
#endif
static bool fips_enabled = false;
static const char *hw_version = QEMU_HW_VERSION;
@ -143,7 +151,6 @@ static int qemu_parse_fdset(const char *param)
static int qemu_lock_fcntl(int fd, int64_t start, int64_t len, int fl_type)
{
#ifdef F_OFD_SETLK
int ret;
struct flock fl = {
.l_whence = SEEK_SET,
@ -151,11 +158,8 @@ static int qemu_lock_fcntl(int fd, int64_t start, int64_t len, int fl_type)
.l_len = len,
.l_type = fl_type,
};
ret = fcntl(fd, F_OFD_SETLK, &fl);
ret = fcntl(fd, QEMU_SETLK, &fl);
return ret == -1 ? -errno : 0;
#else
return -ENOTSUP;
#endif
}
int qemu_lock_fd(int fd, int64_t start, int64_t len, bool exclusive)
@ -170,7 +174,6 @@ int qemu_unlock_fd(int fd, int64_t start, int64_t len)
int qemu_lock_fd_test(int fd, int64_t start, int64_t len, bool exclusive)
{
#ifdef F_OFD_SETLK
int ret;
struct flock fl = {
.l_whence = SEEK_SET,
@ -178,15 +181,12 @@ int qemu_lock_fd_test(int fd, int64_t start, int64_t len, bool exclusive)
.l_len = len,
.l_type = exclusive ? F_WRLCK : F_RDLCK,
};
ret = fcntl(fd, F_OFD_GETLK, &fl);
ret = fcntl(fd, QEMU_GETLK, &fl);
if (ret == -1) {
return -errno;
} else {
return fl.l_type == F_UNLCK ? 0 : -EAGAIN;
}
#else
return -ENOTSUP;
#endif
}
#endif