1 /*
2 * Copyright (c) 2015-2020 François Tigeot <ftigeot@wolfpond.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #ifndef _LINUX_FS_H_
28 #define _LINUX_FS_H_
29
30 #include <linux/wait_bit.h>
31 #include <linux/cache.h>
32 #include <linux/stat.h>
33 #include <linux/list.h>
34 #include <linux/llist.h>
35 #include <linux/radix-tree.h>
36 #include <linux/rbtree.h>
37 #include <linux/init.h>
38 #include <linux/pid.h>
39 #include <linux/bug.h>
40 #include <linux/mutex.h>
41 #include <linux/capability.h>
42 #include <linux/atomic.h>
43 #include <linux/shrinker.h>
44 #include <linux/lockdep.h>
45 #include <linux/workqueue.h>
46 #include <linux/uuid.h>
47
48 #include <sys/file.h> /* for struct file */
49 #include <sys/vnode.h> /* for struct vnode */
50
51 struct address_space;
52
53 struct poll_table_struct;
54 struct vm_area_struct;
55
56 struct inode;
57
imajor(const struct inode * inode)58 static inline unsigned imajor(const struct inode *inode)
59 {
60 const struct vnode *vp = (const void *)inode;
61
62 return vp->v_umajor;
63 }
64
iminor(const struct inode * inode)65 static inline unsigned iminor(const struct inode *inode)
66 {
67 const struct vnode *vp = (const void *)inode;
68
69 return vp->v_uminor;
70 }
71
72 struct file_operations {
73 struct module *owner;
74 int (*open) (struct inode *, struct file *);
75 int (*release) (struct inode *, struct file *);
76 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
77 int (*mmap) (struct file *, struct vm_area_struct *);
78 unsigned int (*poll) (struct file *, struct poll_table_struct *);
79 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
80 loff_t (*llseek) (struct file *, loff_t, int);
81 };
82
83 extern loff_t noop_llseek(struct file *file, loff_t offset, int whence);
84
85 static inline unsigned long
invalidate_mapping_pages(struct vm_object * obj,pgoff_t start,pgoff_t end)86 invalidate_mapping_pages(struct vm_object *obj, pgoff_t start, pgoff_t end)
87 {
88 int start_count, end_count, clean_only = 1;
89
90 /*
91 * XXX - resident_page_count no longer represents the
92 * number of pages that might be mapped.
93 *
94 * All current use cases ignore the return value.
95 */
96 VM_OBJECT_LOCK(obj);
97 start_count = obj->resident_page_count;
98 /* Only non-dirty pages must be freed or invalidated */
99 vm_object_page_remove(obj, start, end, clean_only);
100 end_count = obj->resident_page_count;
101 VM_OBJECT_UNLOCK(obj);
102 return (start_count - end_count);
103 }
104
105 int pagecache_write_begin(struct vm_object *obj, struct address_space *mapping,
106 loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata);
107
108 int pagecache_write_end(struct vm_object *obj, struct address_space *mapping,
109 loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata);
110
111 #endif /* _LINUX_FS_H_ */
112