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

Signed-off-by: NFam Zheng <famz@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

util/osdep.c

@@ -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