1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * V9FS VFS extensions.
4 *
5 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
6 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
7 */
8 #ifndef FS_9P_V9FS_VFS_H
9 #define FS_9P_V9FS_VFS_H
10
11 /* plan9 semantics are that created files are implicitly opened.
12 * But linux semantics are that you call create, then open.
13 * the plan9 approach is superior as it provides an atomic
14 * open.
15 * we track the create fid here. When the file is opened, if fidopen is
16 * non-zero, we use the fid and can skip some steps.
17 * there may be a better way to do this, but I don't know it.
18 * one BAD way is to clunk the fid on create, then open it again:
19 * you lose the atomicity of file open
20 */
21
22 /* special case:
23 * unlink calls remove, which is an implicit clunk. So we have to track
24 * that kind of thing so that we don't try to clunk a dead fid.
25 */
26 #define P9_LOCK_TIMEOUT (30*HZ)
27
28 /* flags for v9fs_stat2inode() & v9fs_stat2inode_dotl() */
29 #define V9FS_STAT2INODE_KEEP_ISIZE 1
30
31 extern struct file_system_type v9fs_fs_type;
32 extern const struct address_space_operations v9fs_addr_operations;
33 extern const struct file_operations v9fs_file_operations;
34 extern const struct file_operations v9fs_file_operations_dotl;
35 extern const struct file_operations v9fs_dir_operations;
36 extern const struct file_operations v9fs_dir_operations_dotl;
37 extern const struct dentry_operations v9fs_dentry_operations;
38 extern const struct dentry_operations v9fs_cached_dentry_operations;
39 extern const struct file_operations v9fs_cached_file_operations;
40 extern const struct file_operations v9fs_cached_file_operations_dotl;
41 extern const struct file_operations v9fs_mmap_file_operations;
42 extern const struct file_operations v9fs_mmap_file_operations_dotl;
43 extern struct kmem_cache *v9fs_inode_cache;
44
45 struct inode *v9fs_alloc_inode(struct super_block *sb);
46 void v9fs_free_inode(struct inode *inode);
47 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t);
48 int v9fs_init_inode(struct v9fs_session_info *v9ses,
49 struct inode *inode, umode_t mode, dev_t);
50 void v9fs_evict_inode(struct inode *inode);
51 ino_t v9fs_qid2ino(struct p9_qid *qid);
52 void v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
53 struct super_block *sb, unsigned int flags);
54 void v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
55 unsigned int flags);
56 int v9fs_dir_release(struct inode *inode, struct file *filp);
57 int v9fs_file_open(struct inode *inode, struct file *file);
58 void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat);
59 int v9fs_uflags2omode(int uflags, int extended);
60
61 void v9fs_blank_wstat(struct p9_wstat *wstat);
62 int v9fs_vfs_setattr_dotl(struct dentry *, struct iattr *);
63 int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
64 int datasync);
65 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode);
66 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode);
v9fs_invalidate_inode_attr(struct inode * inode)67 static inline void v9fs_invalidate_inode_attr(struct inode *inode)
68 {
69 struct v9fs_inode *v9inode;
70 v9inode = V9FS_I(inode);
71 v9inode->cache_validity |= V9FS_INO_INVALID_ATTR;
72 return;
73 }
74
75 int v9fs_open_to_dotl_flags(int flags);
76
v9fs_i_size_write(struct inode * inode,loff_t i_size)77 static inline void v9fs_i_size_write(struct inode *inode, loff_t i_size)
78 {
79 /*
80 * 32-bit need the lock, concurrent updates could break the
81 * sequences and make i_size_read() loop forever.
82 * 64-bit updates are atomic and can skip the locking.
83 */
84 if (sizeof(i_size) > sizeof(long))
85 spin_lock(&inode->i_lock);
86 i_size_write(inode, i_size);
87 if (sizeof(i_size) > sizeof(long))
88 spin_unlock(&inode->i_lock);
89 }
90 #endif
91