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Re: [Qemu-devel] [PATCH 1.0] 9pfs: improve portability to older systems
From: |
Aneesh Kumar K.V |
Subject: |
Re: [Qemu-devel] [PATCH 1.0] 9pfs: improve portability to older systems |
Date: |
Wed, 23 Nov 2011 11:46:27 +0530 |
User-agent: |
Notmuch/0.10~rc1+25~g2459896 (http://notmuchmail.org) Emacs/23.3.1 (x86_64-pc-linux-gnu) |
On Mon, 21 Nov 2011 09:29:11 +0100, Paolo Bonzini <address@hidden> wrote:
> 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 <address@hidden>
> ---
> hw/9pfs/virtio-9p-local.c | 7 +++++--
> oslib-posix.c | 5 ++---
> qemu-os-posix.h | 3 +--
> 3 files changed, 8 insertions(+), 7 deletions(-)
>
> diff --git a/hw/9pfs/virtio-9p-local.c b/hw/9pfs/virtio-9p-local.c
> index 7f1c089..cbd07e8 100644
> --- a/hw/9pfs/virtio-9p-local.c
> +++ b/hw/9pfs/virtio-9p-local.c
> @@ -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;
I guess we can also make sure we don't call local_ioc_getversion at
all.
diff --git a/hw/9pfs/virtio-9p-local.c b/hw/9pfs/virtio-9p-local.c
index 0da3bdd..1c349af 100644
--- a/hw/9pfs/virtio-9p-local.c
+++ b/hw/9pfs/virtio-9p-local.c
@@ -714,10 +714,14 @@ static int local_ioc_getversion(FsContext *ctx, V9fsPath
*path,
static int local_init(FsContext *ctx)
{
- int err;
+ int err = 0;
struct statfs stbuf;
ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT;
+#ifdef FS_IOC_GETVERSION
+ /*
+ * use ioc_getversion only if the iocl is definied
+ */
err = statfs(ctx->fs_root, &stbuf);
if (!err) {
switch (stbuf.f_type) {
@@ -729,6 +733,7 @@ static int local_init(FsContext *ctx)
break;
}
}
+#endif
return err;
}
We would also require same changes for virtio-9p-handle.c right ?
-aneesh