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_dir_operations; 44 extern const struct dentry_operations v9fs_dentry_operations; 45 extern const struct dentry_operations v9fs_cached_dentry_operations; 46 47 struct inode *v9fs_get_inode(struct super_block *sb, int mode); 48 ino_t v9fs_qid2ino(struct p9_qid *qid); 49 void v9fs_stat2inode(struct p9_wstat *, 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 p9_wstat *stat); 53 void v9fs_dentry_release(struct dentry *); 54 int v9fs_uflags2omode(int uflags, int extended); 55 56 ssize_t v9fs_file_readn(struct file *, char *, char __user *, u32, u64); 57