@@ -957,8 +957,7 @@ static int process_requests(int sock)
&spec[0].tv_sec, &spec[0].tv_nsec,
&spec[1].tv_sec, &spec[1].tv_nsec);
if (retval > 0) {
- retval = utimensat(AT_FDCWD, path.data, spec,
- AT_SYMLINK_NOFOLLOW);
+ retval = utimensat_nofollow(AT_FDCWD, path.data, spec);
if (retval < 0) {
retval = -errno;
}
@@ -1071,7 +1071,7 @@ static int local_utimensat(FsContext *s, V9fsPath *fs_path,
goto out;
}
- ret = utimensat(dirfd, name, buf, AT_SYMLINK_NOFOLLOW);
+ ret = utimensat_nofollow(dirfd, name, buf);
close_preserve_errno(dirfd);
out:
g_free(dirpath);
@@ -62,3 +62,99 @@ int fsetxattrat_nofollow(int dirfd, const char *filename, const char *name,
close_preserve_errno(fd);
return ret;
}
+
+#ifndef __has_builtin
+#define __has_builtin(x) 0
+#endif
+
+static int update_times_from_stat(int fd, struct timespec times[2],
+ int update0, int update1)
+{
+ struct stat buf;
+ int ret = fstat(fd, &buf);
+ if (ret == -1) {
+ return ret;
+ }
+ if (update0) {
+ times[0] = buf.st_atimespec;
+ }
+ if (update1) {
+ times[1] = buf.st_mtimespec;
+ }
+ return 0;
+}
+
+int utimensat_nofollow(int dirfd, const char *filename,
+ const struct timespec times_in[2])
+{
+ int ret, fd;
+ int special0, special1;
+ struct timeval futimes_buf[2];
+ struct timespec times[2];
+ memcpy(times, times_in, 2 * sizeof(struct timespec));
+
+/* Check whether we have an SDK version that defines utimensat */
+#if defined(__MAC_10_13)
+# if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_13
+# define UTIMENSAT_AVAILABLE 1
+# elif __has_builtin(__builtin_available)
+# define UTIMENSAT_AVAILABLE __builtin_available(macos 10.13, *)
+# else
+# define UTIMENSAT_AVAILABLE 0
+# endif
+ if (UTIMENSAT_AVAILABLE) {
+ return utimensat(dirfd, filename, times, AT_SYMLINK_NOFOLLOW);
+ }
+#endif
+
+ /* utimensat not available. Use futimes. */
+ fd = openat_file(dirfd, filename, O_PATH_9P_UTIL | O_NOFOLLOW, 0);
+ if (fd == -1) {
+ return -1;
+ }
+
+ special0 = times[0].tv_nsec == UTIME_OMIT;
+ special1 = times[1].tv_nsec == UTIME_OMIT;
+ if (special0 || special1) {
+ /* If both are set, nothing to do */
+ if (special0 && special1) {
+ ret = 0;
+ goto done;
+ }
+
+ ret = update_times_from_stat(fd, times, special0, special1);
+ if (ret < 0) {
+ goto done;
+ }
+ }
+
+ special0 = times[0].tv_nsec == UTIME_NOW;
+ special1 = times[1].tv_nsec == UTIME_NOW;
+ if (special0 || special1) {
+ ret = futimes(fd, NULL);
+ if (ret < 0) {
+ goto done;
+ }
+
+ /* If both are set, we are done */
+ if (special0 && special1) {
+ ret = 0;
+ goto done;
+ }
+
+ ret = update_times_from_stat(fd, times, special0, special1);
+ if (ret < 0) {
+ goto done;
+ }
+ }
+
+ futimes_buf[0].tv_sec = times[0].tv_sec;
+ futimes_buf[0].tv_usec = times[0].tv_nsec / 1000;
+ futimes_buf[1].tv_sec = times[1].tv_sec;
+ futimes_buf[1].tv_usec = times[1].tv_nsec / 1000;
+ ret = futimes(fd, futimes_buf);
+
+done:
+ close_preserve_errno(fd);
+ return ret;
+}
@@ -57,3 +57,9 @@ int fsetxattrat_nofollow(int dirfd, const char *filename, const char *name,
g_free(proc_path);
return ret;
}
+
+int utimensat_nofollow(int dirfd, const char *filename,
+ const struct timespec times[2])
+{
+ return utimensat(dirfd, filename, times, AT_SYMLINK_NOFOLLOW);
+}
@@ -36,6 +36,12 @@ static inline int qemu_lsetxattr(const char *path, const char *name,
#define qemu_lsetxattr lsetxattr
#endif
+/* Compatibility with old SDK Versions for Darwin */
+#if defined(CONFIG_DARWIN) && !defined(UTIME_NOW)
+#define UTIME_NOW -1
+#define UTIME_OMIT -2
+#endif
+
static inline void close_preserve_errno(int fd)
{
int serrno = errno;
@@ -81,5 +87,7 @@ ssize_t flistxattrat_nofollow(int dirfd, const char *filename,
char *list, size_t size);
ssize_t fremovexattrat_nofollow(int dirfd, const char *filename,
const char *name);
+int utimensat_nofollow(int dirfd, const char *filename,
+ const struct timespec times[2]);
#endif
@@ -21,6 +21,7 @@
#include "virtio-9p.h"
#include "fsdev/qemu-fsdev.h"
#include "9p-xattr.h"
+#include "9p-util.h"
#include "coth.h"
#include "trace.h"
#include "migration/blocker.h"
This function is new in Mac OS 10.13. Provide a fallback implementation when building against older SDKs. The complication in the definition comes having to separately handle the used SDK version and the target OS version. - If the SDK version is too low (__MAC_10_13 not defined), utimensat is not defined in the header, so we must not try to use it (doing so would error). - Otherwise, if the targetted OS version is at least 10.13, we know this function is available, so we can unconditionally call it. - Lastly, we check for the availability of the __builtin_available macro to potentially insert a dynamic check for this OS version. However, __builtin_available is only available with sufficiently recent versions of clang and while all Apple clang versions that ship with Xcode versions that support the 10.13 SDK support with builtin, we want to allow building with compilers other than Apple clang that may not support this builtin. Signed-off-by: Keno Fischer <keno@juliacomputing.com> --- Changes from v1: * Correct calculation of tv_usec * Support UTIME_NOW/UTIME/OMIT * Now covers fsdev/virtfs-proxy-helper.c fsdev/virtfs-proxy-helper.c | 3 +- hw/9pfs/9p-local.c | 2 +- hw/9pfs/9p-util-darwin.c | 96 +++++++++++++++++++++++++++++++++++++++++++++ hw/9pfs/9p-util-linux.c | 6 +++ hw/9pfs/9p-util.h | 8 ++++ hw/9pfs/9p.c | 1 + 6 files changed, 113 insertions(+), 3 deletions(-)