/* * V9FS VFS extensions. * * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to: * Free Software Foundation * 51 Franklin Street, Fifth Floor * Boston, MA 02111-1301 USA * */ #ifndef FS_9P_V9FS_VFS_H #define FS_9P_V9FS_VFS_H /* plan9 semantics are that created files are implicitly opened. * But linux semantics are that you call create, then open. * the plan9 approach is superior as it provides an atomic * open. * we track the create fid here. When the file is opened, if fidopen is * non-zero, we use the fid and can skip some steps. * there may be a better way to do this, but I don't know it. * one BAD way is to clunk the fid on create, then open it again: * you lose the atomicity of file open */ /* special case: * unlink calls remove, which is an implicit clunk. So we have to track * that kind of thing so that we don't try to clunk a dead fid. */ #define P9_LOCK_TIMEOUT (30*HZ) extern struct file_system_type v9fs_fs_type; extern const struct address_space_operations v9fs_addr_operations; extern const struct file_operations v9fs_file_operations; extern const struct file_operations v9fs_file_operations_dotl; extern const struct file_operations v9fs_dir_operations; extern const struct file_operations v9fs_dir_operations_dotl; extern const struct dentry_operations v9fs_dentry_operations; extern const struct dentry_operations v9fs_cached_dentry_operations; extern const struct file_operations v9fs_cached_file_operations; extern const struct file_operations v9fs_cached_file_operations_dotl; extern struct kmem_cache *v9fs_inode_cache; struct inode *v9fs_alloc_inode(struct super_block *sb); void v9fs_destroy_inode(struct inode *inode); struct inode *v9fs_get_inode(struct super_block *sb, int mode); int v9fs_init_inode(struct v9fs_session_info *v9ses, struct inode *inode, int mode); void v9fs_evict_inode(struct inode *inode); ino_t v9fs_qid2ino(struct p9_qid *qid); void v9fs_stat2inode(struct p9_wstat *, struct inode *, struct super_block *); void v9fs_stat2inode_dotl(struct p9_stat_dotl *, struct inode *); int v9fs_dir_release(struct inode *inode, struct file *filp); int v9fs_file_open(struct inode *inode, struct file *file); void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat); int v9fs_uflags2omode(int uflags, int extended); ssize_t v9fs_file_readn(struct file *, char *, char __user *, u32, u64); ssize_t v9fs_fid_readn(struct p9_fid *, char *, char __user *, u32, u64); void v9fs_blank_wstat(struct p9_wstat *wstat); int v9fs_vfs_setattr_dotl(struct dentry *, struct iattr *); int v9fs_file_fsync_dotl(struct file *filp, int datasync); ssize_t v9fs_file_write_internal(struct inode *, struct p9_fid *, const char __user *, size_t, loff_t *, int); int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode); int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode); static inline void v9fs_invalidate_inode_attr(struct inode *inode) { struct v9fs_inode *v9inode; v9inode = V9FS_I(inode); v9inode->cache_validity |= V9FS_INO_INVALID_ATTR; return; } #endif