9p: rename uid and gid parameters

Change the names of 'uid' and 'gid' parameters to the more appropriate
'dfltuid' and 'dfltgid'.  This also sets the default uid/gid to -2
(aka nfsnobody)
Signed-off-by: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

Documentation/filesystems/9p.txt

@@ -78,9 +78,9 @@ OPTIONS
 
   noextend	force legacy mode (no 9p2000.u semantics)
 
-  uid		attempt to mount as a particular uid
+  dfltuid	attempt to mount as a particular uid
 
-  gid		attempt to mount with a particular gid
+  dfltgid	attempt to mount with a particular gid
 
   afid		security channel - used by Plan 9 authentication protocols
 

fs/9p/v9fs.c

@@ -84,7 +84,7 @@ static struct p9_trans_module *v9fs_match_trans(const substring_t *name)
 
 enum {
 	/* Options that take integer arguments */
-	Opt_debug, Opt_msize, Opt_uid, Opt_gid, Opt_afid,
+	Opt_debug, Opt_msize, Opt_dfltuid, Opt_dfltgid, Opt_afid,
 	/* String options */
 	Opt_uname, Opt_remotename, Opt_trans,
 	/* Options that take no arguments */
@@ -98,8 +98,8 @@ enum {
 static match_table_t tokens = {
 	{Opt_debug, "debug=%x"},
 	{Opt_msize, "msize=%u"},
-	{Opt_uid, "uid=%u"},
-	{Opt_gid, "gid=%u"},
+	{Opt_dfltuid, "dfltuid=%u"},
+	{Opt_dfltgid, "dfltgid=%u"},
 	{Opt_afid, "afid=%u"},
 	{Opt_uname, "uname=%s"},
 	{Opt_remotename, "aname=%s"},
@@ -159,11 +159,11 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses)
 		case Opt_msize:
 			v9ses->maxdata = option;
 			break;
-		case Opt_uid:
-			v9ses->uid = option;
+		case Opt_dfltuid:
+			v9ses->dfltuid = option;
 			break;
-		case Opt_gid:
-			v9ses->gid = option;
+		case Opt_dfltgid:
+			v9ses->dfltgid = option;
 			break;
 		case Opt_afid:
 			v9ses->afid = option;
@@ -219,6 +219,8 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
 
 	strcpy(v9ses->name, V9FS_DEFUSER);
 	strcpy(v9ses->remotename, V9FS_DEFANAME);
+	v9ses->dfltuid = V9FS_DEFUID;
+	v9ses->dfltgid = V9FS_DEFGID;
 
 	v9ses->options = kstrdup(data, GFP_KERNEL);
 	v9fs_parse_options(v9ses);

fs/9p/v9fs.h

@@ -38,8 +38,8 @@ struct v9fs_session_info {
 	char *options;		/* copy of mount options */
 	char *name;		/* user name to mount as */
 	char *remotename;	/* name of remote hierarchy being mounted */
-	unsigned int uid;	/* default uid/muid for legacy support */
-	unsigned int gid;	/* default gid for legacy support */
+	unsigned int dfltuid;	/* default uid/muid for legacy support */
+	unsigned int dfltgid;	/* default gid for legacy support */
 	struct p9_trans_module *trans; /* 9p transport */
 	struct p9_client *clnt;	/* 9p client */
 	struct dentry *debugfs_dir;
@@ -70,6 +70,8 @@ void v9fs_session_cancel(struct v9fs_session_info *v9ses);
 #define V9FS_PORT	564
 #define V9FS_DEFUSER	"nobody"
 #define V9FS_DEFANAME	""
+#define V9FS_DEFUID	(-2)
+#define V9FS_DEFGID	(-2)
 
 static inline struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode)
 {

fs/9p/vfs_inode.c

@@ -805,8 +805,8 @@ v9fs_stat2inode(struct p9_stat *stat, struct inode *inode,
 	inode->i_mtime.tv_sec = stat->mtime;
 	inode->i_ctime.tv_sec = stat->mtime;
 
-	inode->i_uid = v9ses->uid;
-	inode->i_gid = v9ses->gid;
+	inode->i_uid = v9ses->dfltuid;
+	inode->i_gid = v9ses->dfltgid;
 
 	if (v9fs_extended(v9ses)) {
 		inode->i_uid = stat->n_uid;