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 /* flags for v9fs_stat2inode() & v9fs_stat2inode_dotl() */
44 #define V9FS_STAT2INODE_KEEP_ISIZE 1
45
46 extern struct file_system_type v9fs_fs_type;
47 extern const struct address_space_operations v9fs_addr_operations;
48 extern const struct file_operations v9fs_file_operations;
49 extern const struct file_operations v9fs_file_operations_dotl;
50 extern const struct file_operations v9fs_dir_operations;
51 extern const struct file_operations v9fs_dir_operations_dotl;
52 extern const struct dentry_operations v9fs_dentry_operations;
53 extern const struct dentry_operations v9fs_cached_dentry_operations;
54 extern const struct file_operations v9fs_cached_file_operations;
55 extern const struct file_operations v9fs_cached_file_operations_dotl;
56 extern const struct file_operations v9fs_mmap_file_operations;
57 extern const struct file_operations v9fs_mmap_file_operations_dotl;
58 extern struct kmem_cache *v9fs_inode_cache;
59
60 struct inode *v9fs_alloc_inode(struct super_block *sb);
61 void v9fs_destroy_inode(struct inode *inode);
62 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t);
63 int v9fs_init_inode(struct v9fs_session_info *v9ses,
64 struct inode *inode, umode_t mode, dev_t);
65 void v9fs_evict_inode(struct inode *inode);
66 ino_t v9fs_qid2ino(struct p9_qid *qid);
67 void v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
68 struct super_block *sb, unsigned int flags);
69 void v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
70 unsigned int flags);
71 int v9fs_dir_release(struct inode *inode, struct file *filp);
72 int v9fs_file_open(struct inode *inode, struct file *file);
73 void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat);
74 int v9fs_uflags2omode(int uflags, int extended);
75
76 void v9fs_blank_wstat(struct p9_wstat *wstat);
77 int v9fs_vfs_setattr_dotl(struct dentry *, struct iattr *);
78 int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
79 int datasync);
80 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode);
81 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode);
v9fs_invalidate_inode_attr(struct inode * inode)82 static inline void v9fs_invalidate_inode_attr(struct inode *inode)
83 {
84 struct v9fs_inode *v9inode;
85 v9inode = V9FS_I(inode);
86 v9inode->cache_validity |= V9FS_INO_INVALID_ATTR;
87 return;
88 }
89
90 int v9fs_open_to_dotl_flags(int flags);
91
v9fs_i_size_write(struct inode * inode,loff_t i_size)92 static inline void v9fs_i_size_write(struct inode *inode, loff_t i_size)
93 {
94 /*
95 * 32-bit need the lock, concurrent updates could break the
96 * sequences and make i_size_read() loop forever.
97 * 64-bit updates are atomic and can skip the locking.
98 */
99 if (sizeof(i_size) > sizeof(long))
100 spin_lock(&inode->i_lock);
101 i_size_write(inode, i_size);
102 if (sizeof(i_size) > sizeof(long))
103 spin_unlock(&inode->i_lock);
104 }
105 #endif
106