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 struct kmem_cache *v9fs_inode_cache; |
40 | |
41 | struct inode *v9fs_alloc_inode(struct super_block *sb); |
42 | void v9fs_free_inode(struct inode *inode); |
43 | void v9fs_set_netfs_context(struct inode *inode); |
44 | int v9fs_init_inode(struct v9fs_session_info *v9ses, |
45 | struct inode *inode, struct p9_qid *qid, umode_t mode, dev_t rdev); |
46 | void v9fs_evict_inode(struct inode *inode); |
47 | #if (BITS_PER_LONG == 32) |
48 | #define QID2INO(q) ((ino_t) (((q)->path+2) ^ (((q)->path) >> 32))) |
49 | #else |
50 | #define QID2INO(q) ((ino_t) ((q)->path+2)) |
51 | #endif |
52 | |
53 | void v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
54 | struct super_block *sb, unsigned int flags); |
55 | void v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode, |
56 | unsigned int flags); |
57 | int v9fs_dir_release(struct inode *inode, struct file *filp); |
58 | int v9fs_file_open(struct inode *inode, struct file *file); |
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 mnt_idmap *idmap, |
63 | struct dentry *dentry, struct iattr *iattr); |
64 | int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end, |
65 | int datasync); |
66 | int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode); |
67 | int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode); |
68 | static inline void v9fs_invalidate_inode_attr(struct inode *inode) |
69 | { |
70 | struct v9fs_inode *v9inode; |
71 | |
72 | v9inode = V9FS_I(inode); |
73 | v9inode->cache_validity |= V9FS_INO_INVALID_ATTR; |
74 | } |
75 | |
76 | int v9fs_open_to_dotl_flags(int flags); |
77 | |
78 | static inline void v9fs_i_size_write(struct inode *inode, loff_t i_size) |
79 | { |
80 | /* |
81 | * 32-bit need the lock, concurrent updates could break the |
82 | * sequences and make i_size_read() loop forever. |
83 | * 64-bit updates are atomic and can skip the locking. |
84 | */ |
85 | if (sizeof(i_size) > sizeof(long)) |
86 | spin_lock(lock: &inode->i_lock); |
87 | i_size_write(inode, i_size); |
88 | if (sizeof(i_size) > sizeof(long)) |
89 | spin_unlock(lock: &inode->i_lock); |
90 | } |
91 | #endif |
92 | |