1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * V9FS VFS extensions.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
6*4882a593Smuzhiyun * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun #ifndef FS_9P_V9FS_VFS_H
9*4882a593Smuzhiyun #define FS_9P_V9FS_VFS_H
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun /* plan9 semantics are that created files are implicitly opened.
12*4882a593Smuzhiyun * But linux semantics are that you call create, then open.
13*4882a593Smuzhiyun * the plan9 approach is superior as it provides an atomic
14*4882a593Smuzhiyun * open.
15*4882a593Smuzhiyun * we track the create fid here. When the file is opened, if fidopen is
16*4882a593Smuzhiyun * non-zero, we use the fid and can skip some steps.
17*4882a593Smuzhiyun * there may be a better way to do this, but I don't know it.
18*4882a593Smuzhiyun * one BAD way is to clunk the fid on create, then open it again:
19*4882a593Smuzhiyun * you lose the atomicity of file open
20*4882a593Smuzhiyun */
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun /* special case:
23*4882a593Smuzhiyun * unlink calls remove, which is an implicit clunk. So we have to track
24*4882a593Smuzhiyun * that kind of thing so that we don't try to clunk a dead fid.
25*4882a593Smuzhiyun */
26*4882a593Smuzhiyun #define P9_LOCK_TIMEOUT (30*HZ)
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun /* flags for v9fs_stat2inode() & v9fs_stat2inode_dotl() */
29*4882a593Smuzhiyun #define V9FS_STAT2INODE_KEEP_ISIZE 1
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun extern struct file_system_type v9fs_fs_type;
32*4882a593Smuzhiyun extern const struct address_space_operations v9fs_addr_operations;
33*4882a593Smuzhiyun extern const struct file_operations v9fs_file_operations;
34*4882a593Smuzhiyun extern const struct file_operations v9fs_file_operations_dotl;
35*4882a593Smuzhiyun extern const struct file_operations v9fs_dir_operations;
36*4882a593Smuzhiyun extern const struct file_operations v9fs_dir_operations_dotl;
37*4882a593Smuzhiyun extern const struct dentry_operations v9fs_dentry_operations;
38*4882a593Smuzhiyun extern const struct dentry_operations v9fs_cached_dentry_operations;
39*4882a593Smuzhiyun extern const struct file_operations v9fs_cached_file_operations;
40*4882a593Smuzhiyun extern const struct file_operations v9fs_cached_file_operations_dotl;
41*4882a593Smuzhiyun extern const struct file_operations v9fs_mmap_file_operations;
42*4882a593Smuzhiyun extern const struct file_operations v9fs_mmap_file_operations_dotl;
43*4882a593Smuzhiyun extern struct kmem_cache *v9fs_inode_cache;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun struct inode *v9fs_alloc_inode(struct super_block *sb);
46*4882a593Smuzhiyun void v9fs_free_inode(struct inode *inode);
47*4882a593Smuzhiyun struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t);
48*4882a593Smuzhiyun int v9fs_init_inode(struct v9fs_session_info *v9ses,
49*4882a593Smuzhiyun struct inode *inode, umode_t mode, dev_t);
50*4882a593Smuzhiyun void v9fs_evict_inode(struct inode *inode);
51*4882a593Smuzhiyun ino_t v9fs_qid2ino(struct p9_qid *qid);
52*4882a593Smuzhiyun void v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
53*4882a593Smuzhiyun struct super_block *sb, unsigned int flags);
54*4882a593Smuzhiyun void v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
55*4882a593Smuzhiyun unsigned int flags);
56*4882a593Smuzhiyun int v9fs_dir_release(struct inode *inode, struct file *filp);
57*4882a593Smuzhiyun int v9fs_file_open(struct inode *inode, struct file *file);
58*4882a593Smuzhiyun void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat);
59*4882a593Smuzhiyun int v9fs_uflags2omode(int uflags, int extended);
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun void v9fs_blank_wstat(struct p9_wstat *wstat);
62*4882a593Smuzhiyun int v9fs_vfs_setattr_dotl(struct dentry *, struct iattr *);
63*4882a593Smuzhiyun int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
64*4882a593Smuzhiyun int datasync);
65*4882a593Smuzhiyun int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode);
66*4882a593Smuzhiyun int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode);
v9fs_invalidate_inode_attr(struct inode * inode)67*4882a593Smuzhiyun static inline void v9fs_invalidate_inode_attr(struct inode *inode)
68*4882a593Smuzhiyun {
69*4882a593Smuzhiyun struct v9fs_inode *v9inode;
70*4882a593Smuzhiyun v9inode = V9FS_I(inode);
71*4882a593Smuzhiyun v9inode->cache_validity |= V9FS_INO_INVALID_ATTR;
72*4882a593Smuzhiyun return;
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun int v9fs_open_to_dotl_flags(int flags);
76*4882a593Smuzhiyun
v9fs_i_size_write(struct inode * inode,loff_t i_size)77*4882a593Smuzhiyun static inline void v9fs_i_size_write(struct inode *inode, loff_t i_size)
78*4882a593Smuzhiyun {
79*4882a593Smuzhiyun /*
80*4882a593Smuzhiyun * 32-bit need the lock, concurrent updates could break the
81*4882a593Smuzhiyun * sequences and make i_size_read() loop forever.
82*4882a593Smuzhiyun * 64-bit updates are atomic and can skip the locking.
83*4882a593Smuzhiyun */
84*4882a593Smuzhiyun if (sizeof(i_size) > sizeof(long))
85*4882a593Smuzhiyun spin_lock(&inode->i_lock);
86*4882a593Smuzhiyun i_size_write(inode, i_size);
87*4882a593Smuzhiyun if (sizeof(i_size) > sizeof(long))
88*4882a593Smuzhiyun spin_unlock(&inode->i_lock);
89*4882a593Smuzhiyun }
90*4882a593Smuzhiyun #endif
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