hw/9pfs: Add st_gen support in getattr reply

This patch use file system specific ioctl for getting i_generation
value. Not all file system support the ioctl. So we add an export
specific extended operation and assign right callback for the
file system that support i_generation ioctl

["M. Mohan Kumar" <mohan@in.ibm.com> we can do ioctl only for
regular files and directories on the server]

Signed-off-by: Harsh Prateek Bora <harsh@linux.vnet.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/fsdev/file-op-9p.h b/fsdev/file-op-9p.h
index af3ecbecb7..d6705c03a1 100644
--- a/fsdev/file-op-9p.h
+++ b/fsdev/file-op-9p.h
@@ -49,6 +49,13 @@ typedef struct FsCred
 } FsCred;
 
 struct xattr_operations;
+struct FsContext;
+struct V9fsPath;
+
+typedef struct extended_ops {
+    int (*get_st_gen)(struct FsContext *, struct V9fsPath *,
+                      mode_t, uint64_t *);
+} extended_ops;
 
 /* FsContext flag values */
 #define PATHNAME_FSCONTEXT 0x1
@@ -64,6 +71,7 @@ typedef struct FsContext
     uid_t uid;
     int export_flags;
     struct xattr_operations **xops;
+    struct extended_ops exops;
     /* fs driver specific data */
     void *private;
 } FsContext;