LXR linux/fs/9p/v9fs

   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#ifndef FS_9P_V9FS_VFS_H
  24#define FS_9P_V9FS_VFS_H
  25
  26/* plan9 semantics are that created files are implicitly opened.
  27 * But linux semantics are that you call create, then open.
  28 * the plan9 approach is superior as it provides an atomic
  29 * open.
  30 * we track the create fid here. When the file is opened, if fidopen is
  31 * non-zero, we use the fid and can skip some steps.
  32 * there may be a better way to do this, but I don't know it.
  33 * one BAD way is to clunk the fid on create, then open it again:
  34 * you lose the atomicity of file open
  35 */
  36
  37/* special case:
  38 * unlink calls remove, which is an implicit clunk. So we have to track
  39 * that kind of thing so that we don't try to clunk a dead fid.
  40 */
  41#define P9_LOCK_TIMEOUT (30*HZ)
  42
  43extern struct file_system_type v9fs_fs_type;
  44extern const struct address_space_operations v9fs_addr_operations;
  45extern const struct file_operations v9fs_file_operations;
  46extern const struct file_operations v9fs_file_operations_dotl;
  47extern const struct file_operations v9fs_dir_operations;
  48extern const struct file_operations v9fs_dir_operations_dotl;
  49extern const struct dentry_operations v9fs_dentry_operations;
  50extern const struct dentry_operations v9fs_cached_dentry_operations;
  51extern const struct file_operations v9fs_cached_file_operations;
  52extern const struct file_operations v9fs_cached_file_operations_dotl;
  53extern struct kmem_cache *v9fs_inode_cache;
  54
  55struct inode *v9fs_alloc_inode(struct super_block *sb);
  56void v9fs_destroy_inode(struct inode *inode);
  57struct inode *v9fs_get_inode(struct super_block *sb, int mode, dev_t);
  58int v9fs_init_inode(struct v9fs_session_info *v9ses,
  59                    struct inode *inode, int mode, dev_t);
  60void v9fs_evict_inode(struct inode *inode);
  61ino_t v9fs_qid2ino(struct p9_qid *qid);
  62void v9fs_stat2inode(struct p9_wstat *, struct inode *, struct super_block *);
  63void v9fs_stat2inode_dotl(struct p9_stat_dotl *, struct inode *);
  64int v9fs_dir_release(struct inode *inode, struct file *filp);
  65int v9fs_file_open(struct inode *inode, struct file *file);
  66void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat);
  67int v9fs_uflags2omode(int uflags, int extended);
  68
  69ssize_t v9fs_file_readn(struct file *, char *, char __user *, u32, u64);
  70ssize_t v9fs_fid_readn(struct p9_fid *, char *, char __user *, u32, u64);
  71void v9fs_blank_wstat(struct p9_wstat *wstat);
  72int v9fs_vfs_setattr_dotl(struct dentry *, struct iattr *);
  73int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
  74                         int datasync);
  75ssize_t v9fs_file_write_internal(struct inode *, struct p9_fid *,
  76                                 const char __user *, size_t, loff_t *, int);
  77int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode);
  78int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode);
  79static inline void v9fs_invalidate_inode_attr(struct inode *inode)
  80{
  81        struct v9fs_inode *v9inode;
  82        v9inode = V9FS_I(inode);
  83        v9inode->cache_validity |= V9FS_INO_INVALID_ATTR;
  84        return;
  85}
  86
  87int v9fs_open_to_dotl_flags(int flags);
  88#endif
  89