virtio-9p: Make infrastructure for the new security model.

This patch adds required infrastructure for the new security model.

- A new configure option for attr/xattr.
- if CONFIG_VIRTFS will be defined if both CONFIG_LINUX and CONFIG_ATTR defined.
- Defines routines related to both security models.

Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/hw/file-op-9p.h b/hw/file-op-9p.h
index f84767f989..307bd1eeef 100644
--- a/hw/file-op-9p.h
+++ b/hw/file-op-9p.h
@@ -18,13 +18,33 @@
 #include <utime.h>
 #include <sys/stat.h>
 #include <sys/uio.h>
+#include <sys/vfs.h>
+#define SM_LOCAL_MODE_BITS    0600
+#define SM_LOCAL_DIR_MODE_BITS    0700
+
+typedef enum
+{
+    SM_PASSTHROUGH = 1, /* uid/gid set on fileserver files */
+    SM_MAPPED,  /* uid/gid part of xattr */
+} SecModel;
+
+typedef struct FsCred
+{
+    uid_t   fc_uid;
+    gid_t   fc_gid;
+    mode_t  fc_mode;
+    dev_t   fc_rdev;
+} FsCred;
 
 typedef struct FsContext
 {
     char *fs_root;
+    SecModel fs_sm;
     uid_t uid;
 } FsContext;
 
+extern void cred_init(FsCred *);
+
 typedef struct FileOperations
 {
     int (*lstat)(FsContext *, const char *, struct stat *);