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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
43extern struct file_system_type v9fs_fs_type;
44extern const struct address_space_operations v9fs_addr_operations;
45extern const struct file_operations v9fs_file_operations;
46extern const struct file_operations v9fs_file_operations_dotl;
47extern const struct file_operations v9fs_dir_operations;
48extern const struct file_operations v9fs_dir_operations_dotl;
49extern const struct dentry_operations v9fs_dentry_operations;
50extern const struct dentry_operations v9fs_cached_dentry_operations;
51extern const struct file_operations v9fs_cached_file_operations;
52extern const struct file_operations v9fs_cached_file_operations_dotl;
53extern const struct file_operations v9fs_mmap_file_operations;
54extern const struct file_operations v9fs_mmap_file_operations_dotl;
55extern struct kmem_cache *v9fs_inode_cache;
56
57struct inode *v9fs_alloc_inode(struct super_block *sb);
58void v9fs_destroy_inode(struct inode *inode);
59struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t);
60int v9fs_init_inode(struct v9fs_session_info *v9ses,
61 struct inode *inode, umode_t mode, dev_t);
62void v9fs_evict_inode(struct inode *inode);
63ino_t v9fs_qid2ino(struct p9_qid *qid);
64void v9fs_stat2inode(struct p9_wstat *, struct inode *, struct super_block *);
65void v9fs_stat2inode_dotl(struct p9_stat_dotl *, struct inode *);
66int v9fs_dir_release(struct inode *inode, struct file *filp);
67int v9fs_file_open(struct inode *inode, struct file *file);
68void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat);
69int v9fs_uflags2omode(int uflags, int extended);
70
71void v9fs_blank_wstat(struct p9_wstat *wstat);
72int v9fs_vfs_setattr_dotl(struct dentry *, struct iattr *);
73int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
74 int datasync);
75int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode);
76int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode);
77static inline void v9fs_invalidate_inode_attr(struct inode *inode)
78{
79 struct v9fs_inode *v9inode;
80 v9inode = V9FS_I(inode);
81 v9inode->cache_validity |= V9FS_INO_INVALID_ATTR;
82 return;
83}
84
85int v9fs_open_to_dotl_flags(int flags);
86#endif
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
31extern struct file_system_type v9fs_fs_type;
32extern const struct address_space_operations v9fs_addr_operations;
33extern const struct file_operations v9fs_file_operations;
34extern const struct file_operations v9fs_file_operations_dotl;
35extern const struct file_operations v9fs_dir_operations;
36extern const struct file_operations v9fs_dir_operations_dotl;
37extern const struct dentry_operations v9fs_dentry_operations;
38extern const struct dentry_operations v9fs_cached_dentry_operations;
39extern struct kmem_cache *v9fs_inode_cache;
40
41struct inode *v9fs_alloc_inode(struct super_block *sb);
42void v9fs_free_inode(struct inode *inode);
43void v9fs_set_netfs_context(struct inode *inode);
44int v9fs_init_inode(struct v9fs_session_info *v9ses,
45 struct inode *inode, umode_t mode, dev_t rdev);
46void 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
53void v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
54 struct super_block *sb, unsigned int flags);
55void v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
56 unsigned int flags);
57int v9fs_dir_release(struct inode *inode, struct file *filp);
58int v9fs_file_open(struct inode *inode, struct file *file);
59int v9fs_uflags2omode(int uflags, int extended);
60
61void v9fs_blank_wstat(struct p9_wstat *wstat);
62int v9fs_vfs_setattr_dotl(struct mnt_idmap *idmap,
63 struct dentry *dentry, struct iattr *iattr);
64int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
65 int datasync);
66int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode);
67int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode);
68static 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
76int v9fs_open_to_dotl_flags(int flags);
77
78static 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(&inode->i_lock);
87 i_size_write(inode, i_size);
88 if (sizeof(i_size) > sizeof(long))
89 spin_unlock(&inode->i_lock);
90}
91#endif