1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef _UAPI_LINUX_FCNTL_H
3#define _UAPI_LINUX_FCNTL_H
4
5#include <asm/fcntl.h>
6#include <linux/openat2.h>
7
8#define F_SETLEASE (F_LINUX_SPECIFIC_BASE + 0)
9#define F_GETLEASE (F_LINUX_SPECIFIC_BASE + 1)
10
11/*
12 * Request nofications on a directory.
13 * See below for events that may be notified.
14 */
15#define F_NOTIFY (F_LINUX_SPECIFIC_BASE + 2)
16
17#define F_DUPFD_QUERY (F_LINUX_SPECIFIC_BASE + 3)
18
19/* Was the file just created? */
20#define F_CREATED_QUERY (F_LINUX_SPECIFIC_BASE + 4)
21
22/*
23 * Cancel a blocking posix lock; internal use only until we expose an
24 * asynchronous lock api to userspace:
25 */
26#define F_CANCELLK (F_LINUX_SPECIFIC_BASE + 5)
27
28/* Create a file descriptor with FD_CLOEXEC set. */
29#define F_DUPFD_CLOEXEC (F_LINUX_SPECIFIC_BASE + 6)
30
31/*
32 * Set and get of pipe page size array
33 */
34#define F_SETPIPE_SZ (F_LINUX_SPECIFIC_BASE + 7)
35#define F_GETPIPE_SZ (F_LINUX_SPECIFIC_BASE + 8)
36
37/*
38 * Set/Get seals
39 */
40#define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
41#define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
42
43/*
44 * Types of seals
45 */
46#define F_SEAL_SEAL 0x0001 /* prevent further seals from being set */
47#define F_SEAL_SHRINK 0x0002 /* prevent file from shrinking */
48#define F_SEAL_GROW 0x0004 /* prevent file from growing */
49#define F_SEAL_WRITE 0x0008 /* prevent writes */
50#define F_SEAL_FUTURE_WRITE 0x0010 /* prevent future writes while mapped */
51#define F_SEAL_EXEC 0x0020 /* prevent chmod modifying exec bits */
52/* (1U << 31) is reserved for signed error codes */
53
54/*
55 * Set/Get write life time hints. {GET,SET}_RW_HINT operate on the
56 * underlying inode, while {GET,SET}_FILE_RW_HINT operate only on
57 * the specific file.
58 */
59#define F_GET_RW_HINT (F_LINUX_SPECIFIC_BASE + 11)
60#define F_SET_RW_HINT (F_LINUX_SPECIFIC_BASE + 12)
61#define F_GET_FILE_RW_HINT (F_LINUX_SPECIFIC_BASE + 13)
62#define F_SET_FILE_RW_HINT (F_LINUX_SPECIFIC_BASE + 14)
63
64/*
65 * Valid hint values for F_{GET,SET}_RW_HINT. 0 is "not set", or can be
66 * used to clear any hints previously set.
67 */
68#define RWH_WRITE_LIFE_NOT_SET 0
69#define RWH_WRITE_LIFE_NONE 1
70#define RWH_WRITE_LIFE_SHORT 2
71#define RWH_WRITE_LIFE_MEDIUM 3
72#define RWH_WRITE_LIFE_LONG 4
73#define RWH_WRITE_LIFE_EXTREME 5
74
75/*
76 * The originally introduced spelling is remained from the first
77 * versions of the patch set that introduced the feature, see commit
78 * v4.13-rc1~212^2~51.
79 */
80#define RWF_WRITE_LIFE_NOT_SET RWH_WRITE_LIFE_NOT_SET
81
82/*
83 * Types of directory notifications that may be requested.
84 */
85#define DN_ACCESS 0x00000001 /* File accessed */
86#define DN_MODIFY 0x00000002 /* File modified */
87#define DN_CREATE 0x00000004 /* File created */
88#define DN_DELETE 0x00000008 /* File removed */
89#define DN_RENAME 0x00000010 /* File renamed */
90#define DN_ATTRIB 0x00000020 /* File changed attibutes */
91#define DN_MULTISHOT 0x80000000 /* Don't remove notifier */
92
93/* Reserved kernel ranges [-100], [-10000, -40000]. */
94#define AT_FDCWD -100 /* Special value for dirfd used to
95 indicate openat should use the
96 current working directory. */
97
98/*
99 * The concept of process and threads in userland and the kernel is a confusing
100 * one - within the kernel every thread is a 'task' with its own individual PID,
101 * however from userland's point of view threads are grouped by a single PID,
102 * which is that of the 'thread group leader', typically the first thread
103 * spawned.
104 *
105 * To cut the Gideon knot, for internal kernel usage, we refer to
106 * PIDFD_SELF_THREAD to refer to the current thread (or task from a kernel
107 * perspective), and PIDFD_SELF_THREAD_GROUP to refer to the current thread
108 * group leader...
109 */
110#define PIDFD_SELF_THREAD -10000 /* Current thread. */
111#define PIDFD_SELF_THREAD_GROUP -10001 /* Current thread group leader. */
112
113#define FD_PIDFS_ROOT -10002 /* Root of the pidfs filesystem */
114#define FD_NSFS_ROOT -10003 /* Root of the nsfs filesystem */
115#define FD_INVALID -10009 /* Invalid file descriptor: -10000 - EBADF = -10009 */
116
117/* Generic flags for the *at(2) family of syscalls. */
118
119/* Reserved for per-syscall flags 0xff. */
120#define AT_SYMLINK_NOFOLLOW 0x100 /* Do not follow symbolic
121 links. */
122/* Reserved for per-syscall flags 0x200 */
123#define AT_SYMLINK_FOLLOW 0x400 /* Follow symbolic links. */
124#define AT_NO_AUTOMOUNT 0x800 /* Suppress terminal automount
125 traversal. */
126#define AT_EMPTY_PATH 0x1000 /* Allow empty relative
127 pathname to operate on dirfd
128 directly. */
129/*
130 * These flags are currently statx(2)-specific, but they could be made generic
131 * in the future and so they should not be used for other per-syscall flags.
132 */
133#define AT_STATX_SYNC_TYPE 0x6000 /* Type of synchronisation required from statx() */
134#define AT_STATX_SYNC_AS_STAT 0x0000 /* - Do whatever stat() does */
135#define AT_STATX_FORCE_SYNC 0x2000 /* - Force the attributes to be sync'd with the server */
136#define AT_STATX_DONT_SYNC 0x4000 /* - Don't sync attributes with the server */
137
138#define AT_RECURSIVE 0x8000 /* Apply to the entire subtree */
139
140/*
141 * Per-syscall flags for the *at(2) family of syscalls.
142 *
143 * These are flags that are so syscall-specific that a user passing these flags
144 * to the wrong syscall is so "clearly wrong" that we can safely call such
145 * usage "undefined behaviour".
146 *
147 * For example, the constants AT_REMOVEDIR and AT_EACCESS have the same value.
148 * AT_EACCESS is meaningful only to faccessat, while AT_REMOVEDIR is meaningful
149 * only to unlinkat. The two functions do completely different things and
150 * therefore, the flags can be allowed to overlap. For example, passing
151 * AT_REMOVEDIR to faccessat would be undefined behavior and thus treating it
152 * equivalent to AT_EACCESS is valid undefined behavior.
153 *
154 * Note for implementers: When picking a new per-syscall AT_* flag, try to
155 * reuse already existing flags first. This leaves us with as many unused bits
156 * as possible, so we can use them for generic bits in the future if necessary.
157 */
158
159/* Flags for renameat2(2) (must match legacy RENAME_* flags). */
160#define AT_RENAME_NOREPLACE 0x0001
161#define AT_RENAME_EXCHANGE 0x0002
162#define AT_RENAME_WHITEOUT 0x0004
163
164/* Flag for faccessat(2). */
165#define AT_EACCESS 0x200 /* Test access permitted for
166 effective IDs, not real IDs. */
167/* Flag for unlinkat(2). */
168#define AT_REMOVEDIR 0x200 /* Remove directory instead of
169 unlinking file. */
170/* Flags for name_to_handle_at(2). */
171#define AT_HANDLE_FID 0x200 /* File handle is needed to compare
172 object identity and may not be
173 usable with open_by_handle_at(2). */
174#define AT_HANDLE_MNT_ID_UNIQUE 0x001 /* Return the u64 unique mount ID. */
175#define AT_HANDLE_CONNECTABLE 0x002 /* Request a connectable file handle */
176
177/* Flags for execveat2(2). */
178#define AT_EXECVE_CHECK 0x10000 /* Only perform a check if execution
179 would be allowed. */
180
181#endif /* _UAPI_LINUX_FCNTL_H */
182