fs/9p/v9fs_vfs.h

   1 /*
   2  * V9FS VFS extensions.
   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 /* plan9 semantics are that created files are implicitly opened.
  26  * But linux semantics are that you call create, then open.
  27  * the plan9 approach is superior as it provides an atomic
  28  * open.
  29  * we track the create fid here. When the file is opened, if fidopen is
  30  * non-zero, we use the fid and can skip some steps.
  31  * there may be a better way to do this, but I don't know it.
  32  * one BAD way is to clunk the fid on create, then open it again:
  33  * you lose the atomicity of file open
  34  */
  35
  36 /* special case:
  37  * unlink calls remove, which is an implicit clunk. So we have to track
  38  * that kind of thing so that we don't try to clunk a dead fid.
  39  */
  40
  41 extern struct file_system_type v9fs_fs_type;
  42 extern struct address_space_operations v9fs_addr_operations;
  43 extern struct file_operations v9fs_file_operations;
  44 extern struct file_operations v9fs_dir_operations;
  45 extern struct dentry_operations v9fs_dentry_operations;
  46
  47 struct inode *v9fs_get_inode(struct super_block *sb, int mode);
  48 ino_t v9fs_qid2ino(struct v9fs_qid *qid);
  49 void v9fs_stat2inode(struct v9fs_stat *, struct inode *, struct super_block *);
  50 int v9fs_dir_release(struct inode *inode, struct file *filp);
  51 int v9fs_file_open(struct inode *inode, struct file *file);
  52 void v9fs_inode2stat(struct inode *inode, struct v9fs_stat *stat);
  53 void v9fs_dentry_release(struct dentry *);
  54 int v9fs_uflags2omode(int uflags);