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[Qemu-devel] [PATCH v4] virtio-9p: fix build on !CONFIG_UTIMENSAT
From: |
Hidetoshi Seto |
Subject: |
[Qemu-devel] [PATCH v4] virtio-9p: fix build on !CONFIG_UTIMENSAT |
Date: |
Thu, 18 Nov 2010 09:41:39 +0900 |
User-agent: |
Mozilla/5.0 (Windows; U; Windows NT 6.0; ja; rv:1.9.2.12) Gecko/20101027 Thunderbird/3.1.6 |
This patch introduce a fallback mechanism for old systems that do not
support utimensat(). This fix build failure with following warnings:
hw/virtio-9p-local.c: In function 'local_utimensat':
hw/virtio-9p-local.c:479: warning: implicit declaration of function 'utimensat'
hw/virtio-9p-local.c:479: warning: nested extern declaration of 'utimensat'
and:
hw/virtio-9p.c: In function 'v9fs_setattr_post_chmod':
hw/virtio-9p.c:1410: error: 'UTIME_NOW' undeclared (first use in this function)
hw/virtio-9p.c:1410: error: (Each undeclared identifier is reported only once
hw/virtio-9p.c:1410: error: for each function it appears in.)
hw/virtio-9p.c:1413: error: 'UTIME_OMIT' undeclared (first use in this function)
hw/virtio-9p.c: In function 'v9fs_wstat_post_chmod':
hw/virtio-9p.c:2905: error: 'UTIME_OMIT' undeclared (first use in this function)
v4:
- Use tv_now.tv_usec
- Rebased on latest qemu.git
v3:
- Use better alternative handling for UTIME_NOW/OMIT
- Move qemu_utimensat() to cutils.c
V2:
- Introduce qemu_utimensat()
Acked-by: Chris Wright <address@hidden>
Acked-by: M. Mohan Kumar <address@hidden>
Signed-off-by: Hidetoshi Seto <address@hidden>
---
cutils.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
hw/virtio-9p-local.c | 4 ++--
qemu-common.h | 10 ++++++++++
3 files changed, 56 insertions(+), 2 deletions(-)
diff --git a/cutils.c b/cutils.c
index 28089aa..dbeb3f2 100644
--- a/cutils.c
+++ b/cutils.c
@@ -371,3 +371,47 @@ fail:
return retval;
}
+
+int qemu_utimensat(int dirfd, const char *path, const struct timespec *times,
+ int flags)
+{
+#ifdef CONFIG_UTIMENSAT
+ return utimensat(dirfd, path, times, flags);
+#else
+ /* Fallback: use utimes() instead of utimensat() */
+ struct timeval tv[2], tv_now;
+ struct stat st;
+ int i;
+
+ /* happy if special cases */
+ if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) {
+ return 0;
+ }
+ if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) {
+ return utimes(path, NULL);
+ }
+
+ /* prepare for hard cases */
+ if (times[0].tv_nsec == UTIME_NOW || times[1].tv_nsec == UTIME_NOW) {
+ gettimeofday(&tv_now, NULL);
+ }
+ if (times[0].tv_nsec == UTIME_OMIT || times[1].tv_nsec == UTIME_OMIT) {
+ stat(path, &st);
+ }
+
+ for (i = 0; i < 2; i++) {
+ if (times[i].tv_nsec == UTIME_NOW) {
+ tv[i].tv_sec = tv_now.tv_sec;
+ tv[i].tv_usec = tv_now.tv_usec;
+ } else if (times[i].tv_nsec == UTIME_OMIT) {
+ tv[i].tv_sec = (i == 0) ? st.st_atime : st.st_mtime;
+ tv[i].tv_usec = 0;
+ } else {
+ tv[i].tv_sec = times[i].tv_sec;
+ tv[i].tv_usec = times[i].tv_nsec / 1000;
+ }
+ }
+
+ return utimes(path, &tv[0]);
+#endif
+}
diff --git a/hw/virtio-9p-local.c b/hw/virtio-9p-local.c
index 0d52020..41603ea 100644
--- a/hw/virtio-9p-local.c
+++ b/hw/virtio-9p-local.c
@@ -480,9 +480,9 @@ static int local_chown(FsContext *fs_ctx, const char *path,
FsCred *credp)
}
static int local_utimensat(FsContext *s, const char *path,
- const struct timespec *buf)
+ const struct timespec *buf)
{
- return utimensat(AT_FDCWD, rpath(s, path), buf, AT_SYMLINK_NOFOLLOW);
+ return qemu_utimensat(AT_FDCWD, rpath(s, path), buf, AT_SYMLINK_NOFOLLOW);
}
static int local_remove(FsContext *ctx, const char *path)
diff --git a/qemu-common.h b/qemu-common.h
index b3957f1..f0b2c9d 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -150,6 +150,16 @@ int qemu_fls(int i);
int qemu_fdatasync(int fd);
int fcntl_setfl(int fd, int flag);
ssize_t strtosz(const char *nptr, char **end);
+#ifndef CONFIG_UTIMENSAT
+#ifndef UTIME_NOW
+# define UTIME_NOW ((1l << 30) - 1l)
+#endif
+#ifndef UTIME_OMIT
+# define UTIME_OMIT ((1l << 30) - 2l)
+#endif
+#endif
+int qemu_utimensat(int dirfd, const char *path, const struct timespec *times,
+ int flags);
/* path.c */
void init_paths(const char *prefix);
--
1.7.3.1
- [Qemu-devel] [PATCH v4] virtio-9p: fix build on !CONFIG_UTIMENSAT,
Hidetoshi Seto <=