fs/9p/v9fs.h

   1 /*
   2  * V9FS definitions.
   3  *
   4  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
   5  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to:
  19  *  Free Software Foundation
  20  *  51 Franklin Street, Fifth Floor
  21  *  Boston, MA  02111-1301  USA
  22  *
  23  */
  24
  25 /*
  26   * Idpool structure provides lock and id management
  27   *
  28   */
  29
  30 struct v9fs_idpool {
  31         struct semaphore lock;
  32         struct idr pool;
  33 };
  34
  35 /*
  36   * Session structure provides information for an opened session
  37   *
  38   */
  39
  40 struct v9fs_session_info {
  41         /* options */
  42         unsigned int maxdata;
  43         unsigned char extended; /* set to 1 if we are using UNIX extensions */
  44         unsigned char nodev;    /* set to 1 if no disable device mapping */
  45         unsigned short port;    /* port to connect to */
  46         unsigned short debug;   /* debug level */
  47         unsigned short proto;   /* protocol to use */
  48         unsigned int afid;      /* authentication fid */
  49         unsigned int rfdno;     /* read file descriptor number */
  50         unsigned int wfdno;     /* write file descriptor number */
  51
  52
  53         char *name;             /* user name to mount as */
  54         char *remotename;       /* name of remote hierarchy being mounted */
  55         unsigned int uid;       /* default uid/muid for legacy support */
  56         unsigned int gid;       /* default gid for legacy support */
  57
  58         /* book keeping */
  59         struct v9fs_idpool fidpool;     /* The FID pool for file descriptors */
  60
  61         struct v9fs_transport *transport;
  62         struct v9fs_mux_data *mux;
  63
  64         int inprogress;         /* session in progress => true */
  65         int shutdown;           /* session shutting down. no more attaches. */
  66         unsigned char session_hung;
  67         struct dentry *debugfs_dir;
  68 };
  69
  70 /* possible values of ->proto */
  71 enum {
  72         PROTO_TCP,
  73         PROTO_UNIX,
  74         PROTO_FD,
  75 };
  76
  77 extern struct dentry *v9fs_debugfs_root;
  78
  79 int v9fs_session_init(struct v9fs_session_info *, const char *, char *);
  80 struct v9fs_session_info *v9fs_inode2v9ses(struct inode *);
  81 void v9fs_session_close(struct v9fs_session_info *v9ses);
  82 int v9fs_get_idpool(struct v9fs_idpool *p);
  83 void v9fs_put_idpool(int id, struct v9fs_idpool *p);
  84 int v9fs_check_idpool(int id, struct v9fs_idpool *p);
  85 void v9fs_session_cancel(struct v9fs_session_info *v9ses);
  86
  87 #define V9FS_MAGIC 0x01021997
  88
  89 /* other default globals */
  90 #define V9FS_PORT               564
  91 #define V9FS_DEFUSER    "nobody"
  92 #define V9FS_DEFANAME   ""
  93
  94 /* inital pool sizes for fids and tags */
  95 #define V9FS_START_FIDS 8192
  96 #define V9FS_START_TIDS 256