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hw/9pfs: Proxy getversion

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Add proxy getversion to get generation number

Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
This commit is contained in:
M. Mohan Kumar 2011-12-14 13:58:46 +05:30 • committed by Aneesh Kumar K.V
parent d52b09e475
commit d090e452d4
3 changed files with 119 additions and 0 deletions
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32
hw/9pfs/virtio-9p-proxy.c
View file

@ -243,6 +243,9 @@ static int v9fs_receive_response(V9fsProxy *proxy, int type,
v9fs_string_free(&xattr);
break;
}
case T_GETVERSION:
proxy_unmarshal(reply, PROXY_HDR_SZ, "q", response);
break;
default:
return -1;
}
@ -509,6 +512,14 @@ static int v9fs_request(V9fsProxy *proxy, int type,
header.type = T_LREMOVEXATTR;
}
break;
case T_GETVERSION:
path = va_arg(ap, V9fsString *);
retval = proxy_marshal(iovec, PROXY_HDR_SZ, "s", path);
if (retval > 0) {
header.size = retval;
header.type = T_GETVERSION;
}
break;
default:
error_report("Invalid type %d\n", type);
retval = -EINVAL;
@ -559,6 +570,7 @@ static int v9fs_request(V9fsProxy *proxy, int type,
case T_LSTAT:
case T_READLINK:
case T_STATFS:
case T_GETVERSION:
if (v9fs_receive_response(proxy, type, &retval, response) < 0) {
goto close_error;
}
@ -1064,6 +1076,25 @@ static int proxy_unlinkat(FsContext *ctx, V9fsPath *dir,
return ret;
}
static int proxy_ioc_getversion(FsContext *fs_ctx, V9fsPath *path,
mode_t st_mode, uint64_t *st_gen)
{
int err;
/* Do not try to open special files like device nodes, fifos etc
* we can get fd for regular files and directories only
*/
if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) {
return 0;
}
err = v9fs_request(fs_ctx->private, T_GETVERSION, st_gen, "s", path);
if (err < 0) {
errno = -err;
err = -1;
}
return err;
}
static int proxy_parse_opts(QemuOpts *opts, struct FsDriverEntry *fs)
{
const char *sock_fd = qemu_opt_get(opts, "sock_fd");
@ -1098,6 +1129,7 @@ static int proxy_init(FsContext *ctx)
qemu_mutex_init(&proxy->mutex);
ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT;
ctx->exops.get_st_gen = proxy_ioc_getversion;
return 0;
}