xref: /linux/include/uapi/linux/fcntl.h (revision e045e18dbf3eaac32cdeb2799a5ec84fa694636c)

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _UAPI_LINUX_FCNTL_H
#define _UAPI_LINUX_FCNTL_H

#include <asm/fcntl.h>
#include <linux/openat2.h>

#define F_SETLEASE	(F_LINUX_SPECIFIC_BASE + 0)
#define F_GETLEASE	(F_LINUX_SPECIFIC_BASE + 1)

/*
 * Cancel a blocking posix lock; internal use only until we expose an
 * asynchronous lock api to userspace:
 */
#define F_CANCELLK	(F_LINUX_SPECIFIC_BASE + 5)

/* Create a file descriptor with FD_CLOEXEC set. */
#define F_DUPFD_CLOEXEC	(F_LINUX_SPECIFIC_BASE + 6)

/*
 * Request nofications on a directory.
 * See below for events that may be notified.
 */
#define F_NOTIFY	(F_LINUX_SPECIFIC_BASE+2)

/*
 * Set and get of pipe page size array
 */
#define F_SETPIPE_SZ	(F_LINUX_SPECIFIC_BASE + 7)
#define F_GETPIPE_SZ	(F_LINUX_SPECIFIC_BASE + 8)

/*
 * Set/Get seals
 */
#define F_ADD_SEALS	(F_LINUX_SPECIFIC_BASE + 9)
#define F_GET_SEALS	(F_LINUX_SPECIFIC_BASE + 10)

/*
 * Types of seals
 */
#define F_SEAL_SEAL	0x0001	/* prevent further seals from being set */
#define F_SEAL_SHRINK	0x0002	/* prevent file from shrinking */
#define F_SEAL_GROW	0x0004	/* prevent file from growing */
#define F_SEAL_WRITE	0x0008	/* prevent writes */
#define F_SEAL_FUTURE_WRITE	0x0010  /* prevent future writes while mapped */
#define F_SEAL_EXEC	0x0020  /* prevent chmod modifying exec bits */
/* (1U << 31) is reserved for signed error codes */

/*
 * Set/Get write life time hints. {GET,SET}_RW_HINT operate on the
 * underlying inode, while {GET,SET}_FILE_RW_HINT operate only on
 * the specific file.
 */
#define F_GET_RW_HINT		(F_LINUX_SPECIFIC_BASE + 11)
#define F_SET_RW_HINT		(F_LINUX_SPECIFIC_BASE + 12)
#define F_GET_FILE_RW_HINT	(F_LINUX_SPECIFIC_BASE + 13)
#define F_SET_FILE_RW_HINT	(F_LINUX_SPECIFIC_BASE + 14)

/*
 * Valid hint values for F_{GET,SET}_RW_HINT. 0 is "not set", or can be
 * used to clear any hints previously set.
 */
#define RWH_WRITE_LIFE_NOT_SET	0
#define RWH_WRITE_LIFE_NONE	1
#define RWH_WRITE_LIFE_SHORT	2
#define RWH_WRITE_LIFE_MEDIUM	3
#define RWH_WRITE_LIFE_LONG	4
#define RWH_WRITE_LIFE_EXTREME	5

/*
 * The originally introduced spelling is remained from the first
 * versions of the patch set that introduced the feature, see commit
 * v4.13-rc1~212^2~51.
 */
#define RWF_WRITE_LIFE_NOT_SET	RWH_WRITE_LIFE_NOT_SET

/*
 * Types of directory notifications that may be requested.
 */
#define DN_ACCESS	0x00000001	/* File accessed */
#define DN_MODIFY	0x00000002	/* File modified */
#define DN_CREATE	0x00000004	/* File created */
#define DN_DELETE	0x00000008	/* File removed */
#define DN_RENAME	0x00000010	/* File renamed */
#define DN_ATTRIB	0x00000020	/* File changed attibutes */
#define DN_MULTISHOT	0x80000000	/* Don't remove notifier */

/*
 * The constants AT_REMOVEDIR and AT_EACCESS have the same value.  AT_EACCESS is
 * meaningful only to faccessat, while AT_REMOVEDIR is meaningful only to
 * unlinkat.  The two functions do completely different things and therefore,
 * the flags can be allowed to overlap.  For example, passing AT_REMOVEDIR to
 * faccessat would be undefined behavior and thus treating it equivalent to
 * AT_EACCESS is valid undefined behavior.
 */
#define AT_FDCWD		-100    /* Special value used to indicate
                                           openat should use the current
                                           working directory. */
#define AT_SYMLINK_NOFOLLOW	0x100   /* Do not follow symbolic links.  */
#define AT_EACCESS		0x200	/* Test access permitted for
                                           effective IDs, not real IDs.  */
#define AT_REMOVEDIR		0x200   /* Remove directory instead of
                                           unlinking file.  */
#define AT_SYMLINK_FOLLOW	0x400   /* Follow symbolic links.  */
#define AT_NO_AUTOMOUNT		0x800	/* Suppress terminal automount traversal */
#define AT_EMPTY_PATH		0x1000	/* Allow empty relative pathname */

#define AT_STATX_SYNC_TYPE	0x6000	/* Type of synchronisation required from statx() */
#define AT_STATX_SYNC_AS_STAT	0x0000	/* - Do whatever stat() does */
#define AT_STATX_FORCE_SYNC	0x2000	/* - Force the attributes to be sync'd with the server */
#define AT_STATX_DONT_SYNC	0x4000	/* - Don't sync attributes with the server */

#define AT_RECURSIVE		0x8000	/* Apply to the entire subtree */

/* Flags for name_to_handle_at(2). We reuse AT_ flag space to save bits... */
#define AT_HANDLE_FID		AT_REMOVEDIR	/* file handle is needed to
					compare object identity and may not
					be usable to open_by_handle_at(2) */
#if defined(__KERNEL__)
#define AT_GETATTR_NOSEC	0x80000000
#endif

#endif /* _UAPI_LINUX_FCNTL_H */