fs/9p/v9fs.h

   1 /*
   2  * V9FS definitions.
   3  *
   4  *  Copyright (C) 2004-2008 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 version 2
   9  *  as published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to:
  18  *  Free Software Foundation
  19  *  51 Franklin Street, Fifth Floor
  20  *  Boston, MA  02111-1301  USA
  21  *
  22  */
  23
  24 /*
  25   * Session structure provides information for an opened session
  26   *
  27   */
  28
  29 struct v9fs_session_info {
  30         /* options */
  31         unsigned char flags;    /* session flags */
  32         unsigned char nodev;    /* set to 1 if no disable device mapping */
  33         unsigned short debug;   /* debug level */
  34         unsigned int afid;      /* authentication fid */
  35         unsigned int cache;     /* cache mode */
  36
  37         char *options;          /* copy of mount options */
  38         char *uname;            /* user name to mount as */
  39         char *aname;            /* name of remote hierarchy being mounted */
  40         unsigned int maxdata;   /* max data for client interface */
  41         unsigned int dfltuid;   /* default uid/muid for legacy support */
  42         unsigned int dfltgid;   /* default gid for legacy support */
  43         u32 uid;                /* if ACCESS_SINGLE, the uid that has access */
  44         struct p9_client *clnt; /* 9p client */
  45         struct dentry *debugfs_dir;
  46 };
  47
  48 /* session flags */
  49 enum {
  50         V9FS_EXTENDED           = 0x01, /* 9P2000.u */
  51         V9FS_ACCESS_MASK        = 0x06, /* access mask */
  52         V9FS_ACCESS_SINGLE      = 0x02, /* only one user can access the files */
  53         V9FS_ACCESS_USER        = 0x04, /* attache per user */
  54         V9FS_ACCESS_ANY         = 0x06, /* use the same attach for all users */
  55 };
  56
  57 /* possible values of ->cache */
  58 /* eventually support loose, tight, time, session, default always none */
  59 enum {
  60         CACHE_NONE,             /* default */
  61         CACHE_LOOSE,            /* no consistency */
  62 };
  63
  64 extern struct dentry *v9fs_debugfs_root;
  65
  66 struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *,
  67                                                                         char *);
  68 void v9fs_session_close(struct v9fs_session_info *v9ses);
  69 void v9fs_session_cancel(struct v9fs_session_info *v9ses);
  70
  71 #define V9FS_MAGIC 0x01021997
  72
  73 /* other default globals */
  74 #define V9FS_PORT       564
  75 #define V9FS_DEFUSER    "nobody"
  76 #define V9FS_DEFANAME   ""
  77 #define V9FS_DEFUID     (-2)
  78 #define V9FS_DEFGID     (-2)
  79
  80 static inline struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode)
  81 {
  82         return (inode->i_sb->s_fs_info);
  83 }
  84
  85 static inline int v9fs_extended(struct v9fs_session_info *v9ses)
  86 {
  87         return v9ses->flags & V9FS_EXTENDED;
  88 }