1 files changed, 52 insertions, 15 deletions

diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index 68f82be3bf37..89ee0bace41d 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -91,6 +91,8 @@ enum {
         Opt_legacy, Opt_nodevmap,
         /* Cache options */
         Opt_cache_loose,
+        /* Access options */
+        Opt_access,
         /* Error token */
         Opt_err
 };
@@ -108,6 +110,7 @@ static match_table_t tokens = {
         {Opt_nodevmap, "nodevmap"},
         {Opt_cache_loose, "cache=loose"},
         {Opt_cache_loose, "loose"},
+        {Opt_access, "access=%s"},
         {Opt_err, NULL}
 };
 
@@ -125,10 +128,10 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses)
         char *p;
         int option;
         int ret;
+        char *s, *e;
 
         /* setup defaults */
         v9ses->maxdata = 8192;
-        v9ses->flags = V9FS_EXTENDED;
         v9ses->afid = ~0;
         v9ses->debug = 0;
         v9ses->cache = 0;
@@ -172,10 +175,10 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses)
                         v9ses->trans = v9fs_match_trans(&args[0]);
                         break;
                 case Opt_uname:
-                        match_strcpy(v9ses->name, &args[0]);
+                        match_strcpy(v9ses->uname, &args[0]);
                         break;
                 case Opt_remotename:
-                        match_strcpy(v9ses->remotename, &args[0]);
+                        match_strcpy(v9ses->aname, &args[0]);
                         break;
                 case Opt_legacy:
                         v9ses->flags &= ~V9FS_EXTENDED;
@@ -186,6 +189,22 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses)
                 case Opt_cache_loose:
                         v9ses->cache = CACHE_LOOSE;
                         break;
+
+                case Opt_access:
+                        s = match_strdup(&args[0]);
+                        v9ses->flags &= ~V9FS_ACCESS_MASK;
+                        if (strcmp(s, "user") == 0)
+                                v9ses->flags |= V9FS_ACCESS_USER;
+                        else if (strcmp(s, "any") == 0)
+                                v9ses->flags |= V9FS_ACCESS_ANY;
+                        else {
+                                v9ses->flags |= V9FS_ACCESS_SINGLE;
+                                v9ses->uid = simple_strtol(s, &e, 10);
+                                if (*e != '\0')
+                                        v9ses->uid = ~0;
+                        }
+                        break;
+
                 default:
                         continue;
                 }
@@ -207,21 +226,22 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
         struct p9_trans *trans = NULL;
         struct p9_fid *fid;
 
-        v9ses->name = __getname();
-        if (!v9ses->name)
+        v9ses->uname = __getname();
+        if (!v9ses->uname)
                 return ERR_PTR(-ENOMEM);
 
-        v9ses->remotename = __getname();
-        if (!v9ses->remotename) {
-                __putname(v9ses->name);
+        v9ses->aname = __getname();
+        if (!v9ses->aname) {
+                __putname(v9ses->uname);
                 return ERR_PTR(-ENOMEM);
         }
 
-        strcpy(v9ses->name, V9FS_DEFUSER);
-        strcpy(v9ses->remotename, V9FS_DEFANAME);
+        v9ses->flags = V9FS_EXTENDED | V9FS_ACCESS_USER;
+        strcpy(v9ses->uname, V9FS_DEFUSER);
+        strcpy(v9ses->aname, V9FS_DEFANAME);
+        v9ses->uid = ~0;
         v9ses->dfltuid = V9FS_DEFUID;
         v9ses->dfltgid = V9FS_DEFGID;
-
         v9ses->options = kstrdup(data, GFP_KERNEL);
         v9fs_parse_options(v9ses);
 
@@ -255,8 +275,20 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
                 goto error;
         }
 
-        fid = p9_client_attach(v9ses->clnt, NULL, v9ses->name,
-                                                        v9ses->remotename);
+        if (!v9ses->clnt->dotu)
+                v9ses->flags &= ~V9FS_EXTENDED;
+
+        /* for legacy mode, fall back to V9FS_ACCESS_ANY */
+        if (!v9fs_extended(v9ses) &&
+                ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
+
+                v9ses->flags &= ~V9FS_ACCESS_MASK;
+                v9ses->flags |= V9FS_ACCESS_ANY;
+                v9ses->uid = ~0;
+        }
+
+        fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0,
+                                                        v9ses->aname);
         if (IS_ERR(fid)) {
                 retval = PTR_ERR(fid);
                 fid = NULL;
@@ -264,6 +296,11 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
                 goto error;
         }
 
+        if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
+                fid->uid = v9ses->uid;
+        else
+                fid->uid = ~0;
+
         return fid;
 
 error:
@@ -284,8 +321,8 @@ void v9fs_session_close(struct v9fs_session_info *v9ses)
                 v9ses->clnt = NULL;
         }
 
-        __putname(v9ses->name);
-        __putname(v9ses->remotename);
+        __putname(v9ses->uname);
+        __putname(v9ses->aname);
         kfree(v9ses->options);
 }