Commit | Line | Data |
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1f327613 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
9e82cf6a EVH |
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> | |
9e82cf6a | 7 | */ |
e0459f57 AK |
8 | #ifndef FS_9P_V9FS_VFS_H |
9 | #define FS_9P_V9FS_VFS_H | |
9e82cf6a EVH |
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 | */ | |
e0459f57 | 26 | #define P9_LOCK_TIMEOUT (30*HZ) |
9e82cf6a | 27 | |
5e3cc1ee HT |
28 | /* flags for v9fs_stat2inode() & v9fs_stat2inode_dotl() */ |
29 | #define V9FS_STAT2INODE_KEEP_ISIZE 1 | |
30 | ||
9e82cf6a | 31 | extern struct file_system_type v9fs_fs_type; |
f5e54d6e | 32 | extern const struct address_space_operations v9fs_addr_operations; |
4b6f5d20 | 33 | extern const struct file_operations v9fs_file_operations; |
9b6533c9 | 34 | extern const struct file_operations v9fs_file_operations_dotl; |
4b6f5d20 | 35 | extern const struct file_operations v9fs_dir_operations; |
9b6533c9 | 36 | extern const struct file_operations v9fs_dir_operations_dotl; |
a488257c AV |
37 | extern const struct dentry_operations v9fs_dentry_operations; |
38 | extern const struct dentry_operations v9fs_cached_dentry_operations; | |
29236f4e AK |
39 | extern const struct file_operations v9fs_cached_file_operations; |
40 | extern const struct file_operations v9fs_cached_file_operations_dotl; | |
fb89b45c DM |
41 | extern const struct file_operations v9fs_mmap_file_operations; |
42 | extern const struct file_operations v9fs_mmap_file_operations_dotl; | |
a78ce05d | 43 | extern struct kmem_cache *v9fs_inode_cache; |
9e82cf6a | 44 | |
60e78d2c | 45 | struct inode *v9fs_alloc_inode(struct super_block *sb); |
5e8a0770 | 46 | void v9fs_free_inode(struct inode *inode); |
3eda0de6 | 47 | struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t); |
5ffc0cb3 | 48 | int v9fs_init_inode(struct v9fs_session_info *v9ses, |
3eda0de6 | 49 | struct inode *inode, umode_t mode, dev_t); |
b57922d9 | 50 | void v9fs_evict_inode(struct inode *inode); |
bd238fb4 | 51 | ino_t v9fs_qid2ino(struct p9_qid *qid); |
5e3cc1ee HT |
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); | |
9e82cf6a EVH |
56 | int v9fs_dir_release(struct inode *inode, struct file *filp); |
57 | int v9fs_file_open(struct inode *inode, struct file *file); | |
51a87c55 | 58 | void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat); |
2e4bef41 | 59 | int v9fs_uflags2omode(int uflags, int extended); |
fbedadc1 | 60 | |
7a4439c4 | 61 | void v9fs_blank_wstat(struct p9_wstat *wstat); |
22d8dcdf | 62 | int v9fs_vfs_setattr_dotl(struct dentry *, struct iattr *); |
02c24a82 JB |
63 | int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end, |
64 | int datasync); | |
b3cbea03 AK |
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); | |
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 | } | |
f88657ce AK |
74 | |
75 | int v9fs_open_to_dotl_flags(int flags); | |
5e3cc1ee HT |
76 | |
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 | } | |
e0459f57 | 90 | #endif |