[PATCH] v9fs: VFS superblock operations and glue

This part of the patch contains VFS superblock and mapping code.

Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 105 insertions, 0 deletions

diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
new file mode 100644
index 000000000000..52203027b158
--- /dev/null
+++ b/fs/9p/v9fs.h
@@ -0,0 +1,105 @@
+/*
+ * V9FS definitions.
+ *
+ *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
+ *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to:
+ *  Free Software Foundation
+ *  51 Franklin Street, Fifth Floor
+ *  Boston, MA  02111-1301  USA
+ *
+ */
+
+/*
+  * Idpool structure provides lock and id management
+  *
+  */
+
+struct v9fs_idpool {
+        struct semaphore lock;
+        struct idr pool;
+};
+
+/*
+  * Session structure provides information for an opened session
+  *
+  */
+
+struct v9fs_session_info {
+        /* options */
+        unsigned int maxdata;
+        unsigned char extended; /* set to 1 if we are using UNIX extensions */
+        unsigned char nodev;    /* set to 1 if no disable device mapping */
+        unsigned short port;    /* port to connect to */
+        unsigned short debug;   /* debug level */
+        unsigned short proto;   /* protocol to use */
+        unsigned int afid;      /* authentication fid */
+        unsigned int rfdno;     /* read file descriptor number */
+        unsigned int wfdno;     /* write file descriptor number */
+
+
+        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 */
+
+        /* book keeping */
+        struct v9fs_idpool fidpool;     /* The FID pool for file descriptors */
+        struct v9fs_idpool tidpool;     /* The TID pool for transactions ids */
+
+        /* transport information */
+        struct v9fs_transport *transport;
+
+        int inprogress;         /* session in progress => true */
+        int shutdown;           /* session shutting down. no more attaches. */
+        unsigned char session_hung;
+
+        /* mux private data */
+        struct v9fs_fcall *curfcall;
+        wait_queue_head_t read_wait;
+        struct completion fcread;
+        struct completion proccmpl;
+        struct task_struct *recvproc;
+
+        spinlock_t muxlock;
+        struct list_head mux_fcalls;
+};
+
+/* possible values of ->proto */
+enum {
+        PROTO_TCP,
+        PROTO_UNIX,
+        PROTO_FD,
+};
+
+int v9fs_session_init(struct v9fs_session_info *, const char *, char *);
+struct v9fs_session_info *v9fs_inode2v9ses(struct inode *);
+void v9fs_session_close(struct v9fs_session_info *v9ses);
+int v9fs_get_idpool(struct v9fs_idpool *p);
+void v9fs_put_idpool(int id, struct v9fs_idpool *p);
+int v9fs_get_option(char *opts, char *name, char *buf, int buflen);
+long long v9fs_get_int_option(char *opts, char *name, long long dflt);
+int v9fs_parse_tcp_devname(const char *devname, char **addr, char **remotename);
+
+#define V9FS_MAGIC 0x01021997
+
+/* other default globals */
+#define V9FS_PORT               564
+#define V9FS_DEFUSER    "nobody"
+#define V9FS_DEFANAME   ""
+
+/* inital pool sizes for fids and tags */
+#define V9FS_START_FIDS 8192
+#define V9FS_START_TIDS 256