[Qemu-devel] [PATCH 3/4] hw/9pfs: make get_st_gen() return ENOTTY error on special files

["Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>]

Currently we silently ignore getversion requests for anything except
file or directory. Let's instead return ENOTTY error to indicate that
getversion is not supported. It makes implementation consistent on
all not-supported cases.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 hw/9pfs/virtio-9p-handle.c | 3 ++-
 hw/9pfs/virtio-9p-local.c  | 3 ++-
 hw/9pfs/virtio-9p-proxy.c  | 3 ++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/hw/9pfs/virtio-9p-handle.c b/hw/9pfs/virtio-9p-handle.c
index ed8c126e1d6c..17002a3d2867 100644
--- a/hw/9pfs/virtio-9p-handle.c
+++ b/hw/9pfs/virtio-9p-handle.c
@@ -591,7 +591,8 @@ static int handle_ioc_getversion(FsContext *ctx, V9fsPath *path,
      * We can get fd for regular files and directories only
      */
     if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) {
-            return 0;
+        errno = ENOTTY;
+        return -1;
     }
     err = handle_open(ctx, path, O_RDONLY, &fid_open);
     if (err < 0) {
diff --git a/hw/9pfs/virtio-9p-local.c b/hw/9pfs/virtio-9p-local.c
index 9be8854e9148..df0dbffa7ac4 100644
--- a/hw/9pfs/virtio-9p-local.c
+++ b/hw/9pfs/virtio-9p-local.c
@@ -1077,7 +1077,8 @@ static int local_ioc_getversion(FsContext *ctx, V9fsPath *path,
      * We can get fd for regular files and directories only
      */
     if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) {
-            return 0;
+        errno = ENOTTY;
+        return -1;
     }
     err = local_open(ctx, path, O_RDONLY, &fid_open);
     if (err < 0) {
diff --git a/hw/9pfs/virtio-9p-proxy.c b/hw/9pfs/virtio-9p-proxy.c
index 5f44bb758b35..b57966d9d883 100644
--- a/hw/9pfs/virtio-9p-proxy.c
+++ b/hw/9pfs/virtio-9p-proxy.c
@@ -1086,7 +1086,8 @@ static int proxy_ioc_getversion(FsContext *fs_ctx, V9fsPath *path,
      * we can get fd for regular files and directories only
      */
     if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) {
-        return 0;
+        errno = ENOTTY;
+        return -1;
     }
     err = v9fs_request(fs_ctx->private, T_GETVERSION, st_gen, "s", path);
     if (err < 0) {
-- 
1.8.5.2