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TOMOYO Linux Cross Reference
Linux/fs/9p/v9fs_vfs.h

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  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 
 43 extern struct file_system_type v9fs_fs_type;
 44 extern const struct address_space_operations v9fs_addr_operations;
 45 extern const struct file_operations v9fs_file_operations;
 46 extern const struct file_operations v9fs_file_operations_dotl;
 47 extern const struct file_operations v9fs_dir_operations;
 48 extern const struct file_operations v9fs_dir_operations_dotl;
 49 extern const struct dentry_operations v9fs_dentry_operations;
 50 extern const struct dentry_operations v9fs_cached_dentry_operations;
 51 extern const struct file_operations v9fs_cached_file_operations;
 52 extern const struct file_operations v9fs_cached_file_operations_dotl;
 53 extern struct kmem_cache *v9fs_inode_cache;
 54 
 55 struct inode *v9fs_alloc_inode(struct super_block *sb);
 56 void v9fs_destroy_inode(struct inode *inode);
 57 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t);
 58 int v9fs_init_inode(struct v9fs_session_info *v9ses,
 59                     struct inode *inode, umode_t mode, dev_t);
 60 void v9fs_evict_inode(struct inode *inode);
 61 ino_t v9fs_qid2ino(struct p9_qid *qid);
 62 void v9fs_stat2inode(struct p9_wstat *, struct inode *, struct super_block *);
 63 void v9fs_stat2inode_dotl(struct p9_stat_dotl *, struct inode *);
 64 int v9fs_dir_release(struct inode *inode, struct file *filp);
 65 int v9fs_file_open(struct inode *inode, struct file *file);
 66 void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat);
 67 int v9fs_uflags2omode(int uflags, int extended);
 68 
 69 ssize_t v9fs_file_readn(struct file *, char *, char __user *, u32, u64);
 70 ssize_t v9fs_fid_readn(struct p9_fid *, char *, char __user *, u32, u64);
 71 void v9fs_blank_wstat(struct p9_wstat *wstat);
 72 int v9fs_vfs_setattr_dotl(struct dentry *, struct iattr *);
 73 int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
 74                          int datasync);
 75 ssize_t v9fs_file_write_internal(struct inode *, struct p9_fid *,
 76                                  const char __user *, size_t, loff_t *, int);
 77 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode);
 78 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode);
 79 static 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 
 87 int v9fs_open_to_dotl_flags(int flags);
 88 #endif
 89 

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