1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef _LINUX_IO_URING_H
3 #define _LINUX_IO_URING_H
4
5 #include <linux/sched.h>
6 #include <linux/xarray.h>
7
8 #ifdef __GENKSYMS__
9 /*
10 * ANDROID ABI HACK
11 *
12 * In the 5.10.162 release, the io_uring code was synced with the version
13 * that is in the 5.15.y kernel tree in order to resolve a huge number of
14 * potential, and known, problems with the codebase. This makes for a more
15 * secure and easier-to-update-and-maintain 5.10.y kernel tree, so this is
16 * a great thing, however this caused some issues when it comes to the
17 * Android KABI preservation and checking tools.
18 *
19 * A number of the io_uring structures get used in other core kernel
20 * structures, only as "opaque" pointers, so there is not any real ABI
21 * breakage. But, due to the visibility of the structures going away, the
22 * CRC values of many scheduler variables and functions were changed.
23 *
24 * In order to preserve the CRC values, to prevent all device kernels to be
25 * forced to rebuild for no reason whatsoever from a functional point of
26 * view, we need to keep around the "old" io_uring structures for the CRC
27 * calculation only. This is done by the following definitions of struct
28 * io_identity and struct io_uring_task which will only be visible when the
29 * CRC calculation build happens, not in any functional kernel build.
30 *
31 * Yes, this all is a horrible hack, and these really are not the true
32 * structures that any code uses, but so life is in the world of stable
33 * apis...
34 * The real structures are in io_uring/io_uring.c, see the ones there if
35 * you need to touch or do anything with it.
36 *
37 * NEVER touch these structure definitions, they are fake and not valid code.
38 */
39 struct io_identity {
40 struct files_struct *files;
41 struct mm_struct *mm;
42 #ifdef CONFIG_BLK_CGROUP
43 struct cgroup_subsys_state *blkcg_css;
44 #endif
45 const struct cred *creds;
46 struct nsproxy *nsproxy;
47 struct fs_struct *fs;
48 unsigned long fsize;
49 #ifdef CONFIG_AUDIT
50 kuid_t loginuid;
51 unsigned int sessionid;
52 #endif
53 refcount_t count;
54 };
55
56 struct io_uring_task {
57 /* submission side */
58 struct xarray xa;
59 struct wait_queue_head wait;
60 struct file *last;
61 struct percpu_counter inflight;
62 struct io_identity __identity;
63 struct io_identity *identity;
64 atomic_t in_idle;
65 bool sqpoll;
66 };
67 #endif /* ANDROID ABI HACK */
68
69
70 #if defined(CONFIG_IO_URING)
71 struct sock *io_uring_get_socket(struct file *file);
72 void __io_uring_cancel(bool cancel_all);
73 void __io_uring_free(struct task_struct *tsk);
74
io_uring_files_cancel(void)75 static inline void io_uring_files_cancel(void)
76 {
77 if (current->io_uring)
78 __io_uring_cancel(false);
79 }
io_uring_task_cancel(void)80 static inline void io_uring_task_cancel(void)
81 {
82 if (current->io_uring)
83 __io_uring_cancel(true);
84 }
io_uring_free(struct task_struct * tsk)85 static inline void io_uring_free(struct task_struct *tsk)
86 {
87 if (tsk->io_uring)
88 __io_uring_free(tsk);
89 }
90 #else
io_uring_get_socket(struct file * file)91 static inline struct sock *io_uring_get_socket(struct file *file)
92 {
93 return NULL;
94 }
io_uring_task_cancel(void)95 static inline void io_uring_task_cancel(void)
96 {
97 }
io_uring_files_cancel(void)98 static inline void io_uring_files_cancel(void)
99 {
100 }
io_uring_free(struct task_struct * tsk)101 static inline void io_uring_free(struct task_struct *tsk)
102 {
103 }
104 #endif
105
106 #endif
107