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 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 /* plan9 semantics are that created files are implicitly opened.
  25  * But linux semantics are that you call create, then open.
  26  * the plan9 approach is superior as it provides an atomic
  27  * open.
  28  * we track the create fid here. When the file is opened, if fidopen is
  29  * non-zero, we use the fid and can skip some steps.
  30  * there may be a better way to do this, but I don't know it.
  31  * one BAD way is to clunk the fid on create, then open it again:
  32  * you lose the atomicity of file open
  33  */
  34
  35 /* special case:
  36  * unlink calls remove, which is an implicit clunk. So we have to track
  37  * that kind of thing so that we don't try to clunk a dead fid.
  38  */
  39
  40 extern struct file_system_type v9fs_fs_type;
  41 extern const struct address_space_operations v9fs_addr_operations;
  42 extern const struct file_operations v9fs_file_operations;
  43 extern const struct file_operations v9fs_file_operations_dotl;
  44 extern const struct file_operations v9fs_dir_operations;
  45 extern const struct file_operations v9fs_dir_operations_dotl;
  46 extern const struct dentry_operations v9fs_dentry_operations;
  47 extern const struct dentry_operations v9fs_cached_dentry_operations;
  48
  49 #ifdef CONFIG_9P_FSCACHE
  50 struct inode *v9fs_alloc_inode(struct super_block *sb);
  51 void v9fs_destroy_inode(struct inode *inode);
  52 #endif
  53
  54 struct inode *v9fs_get_inode(struct super_block *sb, int mode);
  55 void v9fs_evict_inode(struct inode *inode);
  56 ino_t v9fs_qid2ino(struct p9_qid *qid);
  57 void v9fs_stat2inode(struct p9_wstat *, struct inode *, struct super_block *);
  58 void v9fs_stat2inode_dotl(struct p9_stat_dotl *, struct inode *);
  59 int v9fs_dir_release(struct inode *inode, struct file *filp);
  60 int v9fs_file_open(struct inode *inode, struct file *file);
  61 void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat);
  62 int v9fs_uflags2omode(int uflags, int extended);
  63
  64 ssize_t v9fs_file_readn(struct file *, char *, char __user *, u32, u64);
  65 void v9fs_blank_wstat(struct p9_wstat *wstat);
  66 int v9fs_vfs_setattr_dotl(struct dentry *, struct iattr *);
  67 int v9fs_file_fsync_dotl(struct file *filp, int datasync);
  68
  69 #define P9_LOCK_TIMEOUT (30*HZ)