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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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