fcntl.h (5840B) - Raw
1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 #ifndef _LINUX_FCNTL_H 3 #define _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 #define AT_FDCWD -100 /* Special value for dirfd used to 94 indicate openat should use the 95 current working directory. */ 96 97 98 /* Generic flags for the *at(2) family of syscalls. */ 99 100 /* Reserved for per-syscall flags 0xff. */ 101 #define AT_SYMLINK_NOFOLLOW 0x100 /* Do not follow symbolic 102 links. */ 103 /* Reserved for per-syscall flags 0x200 */ 104 #define AT_SYMLINK_FOLLOW 0x400 /* Follow symbolic links. */ 105 #define AT_NO_AUTOMOUNT 0x800 /* Suppress terminal automount 106 traversal. */ 107 #define AT_EMPTY_PATH 0x1000 /* Allow empty relative 108 pathname to operate on dirfd 109 directly. */ 110 /* 111 * These flags are currently statx(2)-specific, but they could be made generic 112 * in the future and so they should not be used for other per-syscall flags. 113 */ 114 #define AT_STATX_SYNC_TYPE 0x6000 /* Type of synchronisation required from statx() */ 115 #define AT_STATX_SYNC_AS_STAT 0x0000 /* - Do whatever stat() does */ 116 #define AT_STATX_FORCE_SYNC 0x2000 /* - Force the attributes to be sync'd with the server */ 117 #define AT_STATX_DONT_SYNC 0x4000 /* - Don't sync attributes with the server */ 118 119 #define AT_RECURSIVE 0x8000 /* Apply to the entire subtree */ 120 121 /* 122 * Per-syscall flags for the *at(2) family of syscalls. 123 * 124 * These are flags that are so syscall-specific that a user passing these flags 125 * to the wrong syscall is so "clearly wrong" that we can safely call such 126 * usage "undefined behaviour". 127 * 128 * For example, the constants AT_REMOVEDIR and AT_EACCESS have the same value. 129 * AT_EACCESS is meaningful only to faccessat, while AT_REMOVEDIR is meaningful 130 * only to unlinkat. The two functions do completely different things and 131 * therefore, the flags can be allowed to overlap. For example, passing 132 * AT_REMOVEDIR to faccessat would be undefined behavior and thus treating it 133 * equivalent to AT_EACCESS is valid undefined behavior. 134 * 135 * Note for implementers: When picking a new per-syscall AT_* flag, try to 136 * reuse already existing flags first. This leaves us with as many unused bits 137 * as possible, so we can use them for generic bits in the future if necessary. 138 */ 139 140 /* Flags for renameat2(2) (must match legacy RENAME_* flags). */ 141 #define AT_RENAME_NOREPLACE 0x0001 142 #define AT_RENAME_EXCHANGE 0x0002 143 #define AT_RENAME_WHITEOUT 0x0004 144 145 /* Flag for faccessat(2). */ 146 #define AT_EACCESS 0x200 /* Test access permitted for 147 effective IDs, not real IDs. */ 148 /* Flag for unlinkat(2). */ 149 #define AT_REMOVEDIR 0x200 /* Remove directory instead of 150 unlinking file. */ 151 /* Flags for name_to_handle_at(2). */ 152 #define AT_HANDLE_FID 0x200 /* File handle is needed to compare 153 object identity and may not be 154 usable with open_by_handle_at(2). */ 155 #define AT_HANDLE_MNT_ID_UNIQUE 0x001 /* Return the u64 unique mount ID. */ 156 #define AT_HANDLE_CONNECTABLE 0x002 /* Request a connectable file handle */ 157 158 #endif /* _LINUX_FCNTL_H */