Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * Wrapper functions for accessing the file_struct fd array. |
| 4 | */ |
| 5 | |
| 6 | #ifndef __LINUX_FILE_H |
| 7 | #define __LINUX_FILE_H |
| 8 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/compiler.h> |
Eric Dumazet | 0c9e63f | 2006-03-23 03:00:12 -0800 | [diff] [blame] | 10 | #include <linux/types.h> |
Al Viro | 9f3acc3 | 2008-04-24 07:44:08 -0400 | [diff] [blame] | 11 | #include <linux/posix_types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | |
Al Viro | 9f3acc3 | 2008-04-24 07:44:08 -0400 | [diff] [blame] | 13 | struct file; |
Christoph Lameter | 8b7d91e | 2006-12-06 20:32:52 -0800 | [diff] [blame] | 14 | |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 15 | extern void fput(struct file *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 17 | struct file_operations; |
| 18 | struct vfsmount; |
| 19 | struct dentry; |
Al Viro | d93aa9d | 2018-06-09 09:40:05 -0400 | [diff] [blame] | 20 | struct inode; |
Al Viro | 2c48b9c | 2009-08-09 00:52:35 +0400 | [diff] [blame] | 21 | struct path; |
Al Viro | d93aa9d | 2018-06-09 09:40:05 -0400 | [diff] [blame] | 22 | extern struct file *alloc_file_pseudo(struct inode *, struct vfsmount *, |
| 23 | const char *, int flags, const struct file_operations *); |
Al Viro | 183266f | 2018-06-17 14:15:10 -0400 | [diff] [blame] | 24 | extern struct file *alloc_file_clone(struct file *, int flags, |
| 25 | const struct file_operations *); |
Dave Hansen | ce8d2cd | 2007-10-16 23:31:13 -0700 | [diff] [blame] | 26 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | static inline void fput_light(struct file *file, int fput_needed) |
| 28 | { |
Steven Rostedt | c2b3e74 | 2010-12-13 19:38:08 -0500 | [diff] [blame] | 29 | if (fput_needed) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | fput(file); |
| 31 | } |
| 32 | |
Al Viro | a5b470b | 2012-08-27 19:55:01 -0400 | [diff] [blame] | 33 | struct fd { |
| 34 | struct file *file; |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 35 | unsigned int flags; |
Al Viro | a5b470b | 2012-08-27 19:55:01 -0400 | [diff] [blame] | 36 | }; |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 37 | #define FDPUT_FPUT 1 |
| 38 | #define FDPUT_POS_UNLOCK 2 |
Al Viro | a5b470b | 2012-08-27 19:55:01 -0400 | [diff] [blame] | 39 | |
| 40 | static inline void fdput(struct fd fd) |
| 41 | { |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 42 | if (fd.flags & FDPUT_FPUT) |
Al Viro | a5b470b | 2012-08-27 19:55:01 -0400 | [diff] [blame] | 43 | fput(fd.file); |
| 44 | } |
| 45 | |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 46 | extern struct file *fget(unsigned int fd); |
Al Viro | bd2a31d | 2014-03-04 14:54:22 -0500 | [diff] [blame] | 47 | extern struct file *fget_raw(unsigned int fd); |
| 48 | extern unsigned long __fdget(unsigned int fd); |
| 49 | extern unsigned long __fdget_raw(unsigned int fd); |
| 50 | extern unsigned long __fdget_pos(unsigned int fd); |
Al Viro | 63b6df1 | 2016-04-20 17:08:21 -0400 | [diff] [blame] | 51 | extern void __f_unlock_pos(struct file *); |
Al Viro | bd2a31d | 2014-03-04 14:54:22 -0500 | [diff] [blame] | 52 | |
| 53 | static inline struct fd __to_fd(unsigned long v) |
| 54 | { |
| 55 | return (struct fd){(struct file *)(v & ~3),v & 3}; |
| 56 | } |
Al Viro | a5b470b | 2012-08-27 19:55:01 -0400 | [diff] [blame] | 57 | |
| 58 | static inline struct fd fdget(unsigned int fd) |
| 59 | { |
Al Viro | bd2a31d | 2014-03-04 14:54:22 -0500 | [diff] [blame] | 60 | return __to_fd(__fdget(fd)); |
Al Viro | a5b470b | 2012-08-27 19:55:01 -0400 | [diff] [blame] | 61 | } |
| 62 | |
| 63 | static inline struct fd fdget_raw(unsigned int fd) |
| 64 | { |
Al Viro | bd2a31d | 2014-03-04 14:54:22 -0500 | [diff] [blame] | 65 | return __to_fd(__fdget_raw(fd)); |
Al Viro | a5b470b | 2012-08-27 19:55:01 -0400 | [diff] [blame] | 66 | } |
| 67 | |
Al Viro | 63b6df1 | 2016-04-20 17:08:21 -0400 | [diff] [blame] | 68 | static inline struct fd fdget_pos(int fd) |
| 69 | { |
| 70 | return __to_fd(__fdget_pos(fd)); |
| 71 | } |
| 72 | |
| 73 | static inline void fdput_pos(struct fd f) |
| 74 | { |
| 75 | if (f.flags & FDPUT_POS_UNLOCK) |
| 76 | __f_unlock_pos(f.file); |
| 77 | fdput(f); |
| 78 | } |
| 79 | |
Al Viro | fe17f22 | 2012-08-21 11:48:11 -0400 | [diff] [blame] | 80 | extern int f_dupfd(unsigned int from, struct file *file, unsigned flags); |
Al Viro | 8280d16 | 2012-08-21 12:11:46 -0400 | [diff] [blame] | 81 | extern int replace_fd(unsigned fd, struct file *file, unsigned flags); |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 82 | extern void set_close_on_exec(unsigned int fd, int flag); |
Al Viro | fe17f22 | 2012-08-21 11:48:11 -0400 | [diff] [blame] | 83 | extern bool get_close_on_exec(unsigned int fd); |
Al Viro | 1a7bd22 | 2012-08-12 17:18:05 -0400 | [diff] [blame] | 84 | extern int get_unused_fd_flags(unsigned flags); |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 85 | extern void put_unused_fd(unsigned int fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
Harvey Harrison | b3c9752 | 2008-02-13 15:03:15 -0800 | [diff] [blame] | 87 | extern void fd_install(unsigned int fd, struct file *file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
Al Viro | 4a9d4b0 | 2012-06-24 09:56:45 +0400 | [diff] [blame] | 89 | extern void flush_delayed_fput(void); |
Zhen Kong | ee7bdc6 | 2019-03-14 10:55:19 -0700 | [diff] [blame^] | 90 | extern void flush_delayed_fput_wait(void); |
Al Viro | 4a9d4b0 | 2012-06-24 09:56:45 +0400 | [diff] [blame] | 91 | extern void __fput_sync(struct file *); |
| 92 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | #endif /* __LINUX_FILE_H */ |