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9pfs: improve portability to older systems 

Small requirements on "new" features have percolated to virtio-9p-local.c.
In particular, the utimensat wrapper actually only supports dirfd = AT_FDCWD
and flags = AT_SYMLINK_NOFOLLOW in the fallback code.  Remove the arguments
so that virtio-9p-local.c will not use AT_* constants.

At the same time, fail local_ioc_getversion if the ioctl is not supported
by the host.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Paolo Bonzini 2011-11-21 09:29:11 +01:00 committed by Anthony Liguori
parent 13bd0b5026
commit ae0f940e6b
3 changed files with 8 additions and 7 deletions
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7
hw/9pfs/virtio-9p-local.c
View File

@ -583,8 +583,7 @@ static int local_utimensat(FsContext *s, V9fsPath *fs_path,
char buffer[PATH_MAX];
char *path = fs_path->data;
return qemu_utimensat(AT_FDCWD, rpath(s, path, buffer), buf,
AT_SYMLINK_NOFOLLOW);
return qemu_utimens(rpath(s, path, buffer), buf);
}
static int local_remove(FsContext *ctx, const char *path)
@ -694,6 +693,7 @@ static int local_ioc_getversion(FsContext *ctx, V9fsPath *path,
mode_t st_mode, uint64_t *st_gen)
{
int err;
#ifdef FS_IOC_GETVERSION
V9fsFidOpenState fid_open;
/*
@ -709,6 +709,9 @@ static int local_ioc_getversion(FsContext *ctx, V9fsPath *path,
}
err = ioctl(fid_open.fd, FS_IOC_GETVERSION, st_gen);
local_close(ctx, &fid_open);
#else
err = -ENOTTY;
#endif
return err;
}

5
oslib-posix.c
View File

@ -162,8 +162,7 @@ int qemu_pipe(int pipefd[2])
return ret;
}
int qemu_utimensat(int dirfd, const char *path, const struct timespec *times,
int flags)
int qemu_utimens(const char *path, const struct timespec *times)
{
struct timeval tv[2], tv_now;
struct stat st;
@ -171,7 +170,7 @@ int qemu_utimensat(int dirfd, const char *path, const struct timespec *times,
#ifdef CONFIG_UTIMENSAT
int ret;
ret = utimensat(dirfd, path, times, flags);
ret = utimensat(AT_FDCWD, path, times, AT_SYMLINK_NOFOLLOW);
if (ret != -1 || errno != ENOSYS) {
return ret;
}

3
qemu-os-posix.h
View File

@ -44,7 +44,6 @@ typedef struct timeval qemu_timeval;
#endif
#endif
typedef struct timespec qemu_timespec;
int qemu_utimensat(int dirfd, const char *path, const qemu_timespec *times,
int flags);
int qemu_utimens(const char *path, const qemu_timespec *times);
#endif