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1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef _UAPI_LINUX_FS_H
3 #define _UAPI_LINUX_FS_H
4 
5 /*
6  * This file has definitions for some important file table structures
7  * and constants and structures used by various generic file system
8  * ioctl's.  Please do not make any changes in this file before
9  * sending patches for review to linux-fsdevel@vger.kernel.org and
10  * linux-api@vger.kernel.org.
11  */
12 
13 #include <linux/limits.h>
14 #include <linux/ioctl.h>
15 #include <linux/types.h>
16 
17 /* Use of MS_* flags within the kernel is restricted to core mount(2) code. */
18 #if !defined(__KERNEL__)
19 #include <linux/mount.h>
20 #endif
21 
22 /*
23  * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
24  * the file limit at runtime and only root can increase the per-process
25  * nr_file rlimit, so it's safe to set up a ridiculously high absolute
26  * upper limit on files-per-process.
27  *
28  * Some programs (notably those using select()) may have to be
29  * recompiled to take full advantage of the new limits..
30  */
31 
32 /* Fixed constants first: */
33 #undef NR_OPEN
34 #define INR_OPEN_CUR 1024	/* Initial setting for nfile rlimits */
35 #define INR_OPEN_MAX 4096	/* Hard limit for nfile rlimits */
36 
37 #define BLOCK_SIZE_BITS 10
38 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
39 
40 #define SEEK_SET	0	/* seek relative to beginning of file */
41 #define SEEK_CUR	1	/* seek relative to current file position */
42 #define SEEK_END	2	/* seek relative to end of file */
43 #define SEEK_DATA	3	/* seek to the next data */
44 #define SEEK_HOLE	4	/* seek to the next hole */
45 #define SEEK_MAX	SEEK_HOLE
46 
47 #define RENAME_NOREPLACE	(1 << 0)	/* Don't overwrite target */
48 #define RENAME_EXCHANGE		(1 << 1)	/* Exchange source and dest */
49 #define RENAME_WHITEOUT		(1 << 2)	/* Whiteout source */
50 
51 struct file_clone_range {
52 	__s64 src_fd;
53 	__u64 src_offset;
54 	__u64 src_length;
55 	__u64 dest_offset;
56 };
57 
58 struct fstrim_range {
59 	__u64 start;
60 	__u64 len;
61 	__u64 minlen;
62 };
63 
64 /* extent-same (dedupe) ioctls; these MUST match the btrfs ioctl definitions */
65 #define FILE_DEDUPE_RANGE_SAME		0
66 #define FILE_DEDUPE_RANGE_DIFFERS	1
67 
68 /* from struct btrfs_ioctl_file_extent_same_info */
69 struct file_dedupe_range_info {
70 	__s64 dest_fd;		/* in - destination file */
71 	__u64 dest_offset;	/* in - start of extent in destination */
72 	__u64 bytes_deduped;	/* out - total # of bytes we were able
73 				 * to dedupe from this file. */
74 	/* status of this dedupe operation:
75 	 * < 0 for error
76 	 * == FILE_DEDUPE_RANGE_SAME if dedupe succeeds
77 	 * == FILE_DEDUPE_RANGE_DIFFERS if data differs
78 	 */
79 	__s32 status;		/* out - see above description */
80 	__u32 reserved;		/* must be zero */
81 };
82 
83 /* from struct btrfs_ioctl_file_extent_same_args */
84 struct file_dedupe_range {
85 	__u64 src_offset;	/* in - start of extent in source */
86 	__u64 src_length;	/* in - length of extent */
87 	__u16 dest_count;	/* in - total elements in info array */
88 	__u16 reserved1;	/* must be zero */
89 	__u32 reserved2;	/* must be zero */
90 	struct file_dedupe_range_info info[0];
91 };
92 
93 /* And dynamically-tunable limits and defaults: */
94 struct files_stat_struct {
95 	unsigned long nr_files;		/* read only */
96 	unsigned long nr_free_files;	/* read only */
97 	unsigned long max_files;		/* tunable */
98 };
99 
100 struct inodes_stat_t {
101 	long nr_inodes;
102 	long nr_unused;
103 	long dummy[5];		/* padding for sysctl ABI compatibility */
104 };
105 
106 
107 #define NR_FILE  8192	/* this can well be larger on a larger system */
108 
109 /*
110  * Structure for FS_IOC_FSGETXATTR[A] and FS_IOC_FSSETXATTR.
111  */
112 struct fsxattr {
113 	__u32		fsx_xflags;	/* xflags field value (get/set) */
114 	__u32		fsx_extsize;	/* extsize field value (get/set)*/
115 	__u32		fsx_nextents;	/* nextents field value (get)	*/
116 	__u32		fsx_projid;	/* project identifier (get/set) */
117 	__u32		fsx_cowextsize;	/* CoW extsize field value (get/set)*/
118 	unsigned char	fsx_pad[8];
119 };
120 
121 /*
122  * Flags for the fsx_xflags field
123  */
124 #define FS_XFLAG_REALTIME	0x00000001	/* data in realtime volume */
125 #define FS_XFLAG_PREALLOC	0x00000002	/* preallocated file extents */
126 #define FS_XFLAG_IMMUTABLE	0x00000008	/* file cannot be modified */
127 #define FS_XFLAG_APPEND		0x00000010	/* all writes append */
128 #define FS_XFLAG_SYNC		0x00000020	/* all writes synchronous */
129 #define FS_XFLAG_NOATIME	0x00000040	/* do not update access time */
130 #define FS_XFLAG_NODUMP		0x00000080	/* do not include in backups */
131 #define FS_XFLAG_RTINHERIT	0x00000100	/* create with rt bit set */
132 #define FS_XFLAG_PROJINHERIT	0x00000200	/* create with parents projid */
133 #define FS_XFLAG_NOSYMLINKS	0x00000400	/* disallow symlink creation */
134 #define FS_XFLAG_EXTSIZE	0x00000800	/* extent size allocator hint */
135 #define FS_XFLAG_EXTSZINHERIT	0x00001000	/* inherit inode extent size */
136 #define FS_XFLAG_NODEFRAG	0x00002000	/* do not defragment */
137 #define FS_XFLAG_FILESTREAM	0x00004000	/* use filestream allocator */
138 #define FS_XFLAG_DAX		0x00008000	/* use DAX for IO */
139 #define FS_XFLAG_COWEXTSIZE	0x00010000	/* CoW extent size allocator hint */
140 #define FS_XFLAG_HASATTR	0x80000000	/* no DIFLAG for this	*/
141 
142 /* the read-only stuff doesn't really belong here, but any other place is
143    probably as bad and I don't want to create yet another include file. */
144 
145 #define BLKROSET   _IO(0x12,93)	/* set device read-only (0 = read-write) */
146 #define BLKROGET   _IO(0x12,94)	/* get read-only status (0 = read_write) */
147 #define BLKRRPART  _IO(0x12,95)	/* re-read partition table */
148 #define BLKGETSIZE _IO(0x12,96)	/* return device size /512 (long *arg) */
149 #define BLKFLSBUF  _IO(0x12,97)	/* flush buffer cache */
150 #define BLKRASET   _IO(0x12,98)	/* set read ahead for block device */
151 #define BLKRAGET   _IO(0x12,99)	/* get current read ahead setting */
152 #define BLKFRASET  _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
153 #define BLKFRAGET  _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
154 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
155 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
156 #define BLKSSZGET  _IO(0x12,104)/* get block device sector size */
157 #if 0
158 #define BLKPG      _IO(0x12,105)/* See blkpg.h */
159 
160 /* Some people are morons.  Do not use sizeof! */
161 
162 #define BLKELVGET  _IOR(0x12,106,size_t)/* elevator get */
163 #define BLKELVSET  _IOW(0x12,107,size_t)/* elevator set */
164 /* This was here just to show that the number is taken -
165    probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
166 #endif
167 /* A jump here: 108-111 have been used for various private purposes. */
168 #define BLKBSZGET  _IOR(0x12,112,size_t)
169 #define BLKBSZSET  _IOW(0x12,113,size_t)
170 #define BLKGETSIZE64 _IOR(0x12,114,size_t)	/* return device size in bytes (u64 *arg) */
171 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
172 #define BLKTRACESTART _IO(0x12,116)
173 #define BLKTRACESTOP _IO(0x12,117)
174 #define BLKTRACETEARDOWN _IO(0x12,118)
175 #define BLKDISCARD _IO(0x12,119)
176 #define BLKIOMIN _IO(0x12,120)
177 #define BLKIOOPT _IO(0x12,121)
178 #define BLKALIGNOFF _IO(0x12,122)
179 #define BLKPBSZGET _IO(0x12,123)
180 #define BLKDISCARDZEROES _IO(0x12,124)
181 #define BLKSECDISCARD _IO(0x12,125)
182 #define BLKROTATIONAL _IO(0x12,126)
183 #define BLKZEROOUT _IO(0x12,127)
184 /*
185  * A jump here: 130-131 are reserved for zoned block devices
186  * (see uapi/linux/blkzoned.h)
187  */
188 
189 #define BMAP_IOCTL 1		/* obsolete - kept for compatibility */
190 #define FIBMAP	   _IO(0x00,1)	/* bmap access */
191 #define FIGETBSZ   _IO(0x00,2)	/* get the block size used for bmap */
192 #define FIFREEZE	_IOWR('X', 119, int)	/* Freeze */
193 #define FITHAW		_IOWR('X', 120, int)	/* Thaw */
194 #define FITRIM		_IOWR('X', 121, struct fstrim_range)	/* Trim */
195 #define FICLONE		_IOW(0x94, 9, int)
196 #define FICLONERANGE	_IOW(0x94, 13, struct file_clone_range)
197 #define FIDEDUPERANGE	_IOWR(0x94, 54, struct file_dedupe_range)
198 
199 #define FSLABEL_MAX 256	/* Max chars for the interface; each fs may differ */
200 
201 #define	FS_IOC_GETFLAGS			_IOR('f', 1, long)
202 #define	FS_IOC_SETFLAGS			_IOW('f', 2, long)
203 #define	FS_IOC_GETVERSION		_IOR('v', 1, long)
204 #define	FS_IOC_SETVERSION		_IOW('v', 2, long)
205 #define FS_IOC_FIEMAP			_IOWR('f', 11, struct fiemap)
206 #define FS_IOC32_GETFLAGS		_IOR('f', 1, int)
207 #define FS_IOC32_SETFLAGS		_IOW('f', 2, int)
208 #define FS_IOC32_GETVERSION		_IOR('v', 1, int)
209 #define FS_IOC32_SETVERSION		_IOW('v', 2, int)
210 #define FS_IOC_FSGETXATTR		_IOR('X', 31, struct fsxattr)
211 #define FS_IOC_FSSETXATTR		_IOW('X', 32, struct fsxattr)
212 #define FS_IOC_GETFSLABEL		_IOR(0x94, 49, char[FSLABEL_MAX])
213 #define FS_IOC_SETFSLABEL		_IOW(0x94, 50, char[FSLABEL_MAX])
214 
215 /*
216  * File system encryption support
217  */
218 /* Policy provided via an ioctl on the topmost directory */
219 #define FS_KEY_DESCRIPTOR_SIZE	8
220 
221 #define FS_POLICY_FLAGS_PAD_4		0x00
222 #define FS_POLICY_FLAGS_PAD_8		0x01
223 #define FS_POLICY_FLAGS_PAD_16		0x02
224 #define FS_POLICY_FLAGS_PAD_32		0x03
225 #define FS_POLICY_FLAGS_PAD_MASK	0x03
226 #define FS_POLICY_FLAG_DIRECT_KEY	0x04	/* use master key directly */
227 #define FS_POLICY_FLAGS_VALID		0x07
228 
229 /* Encryption algorithms */
230 #define FS_ENCRYPTION_MODE_INVALID		0
231 #define FS_ENCRYPTION_MODE_AES_256_XTS		1
232 #define FS_ENCRYPTION_MODE_AES_256_GCM		2
233 #define FS_ENCRYPTION_MODE_AES_256_CBC		3
234 #define FS_ENCRYPTION_MODE_AES_256_CTS		4
235 #define FS_ENCRYPTION_MODE_AES_128_CBC		5
236 #define FS_ENCRYPTION_MODE_AES_128_CTS		6
237 #define FS_ENCRYPTION_MODE_SPECK128_256_XTS	7 /* Removed, do not use. */
238 #define FS_ENCRYPTION_MODE_SPECK128_256_CTS	8 /* Removed, do not use. */
239 #define FS_ENCRYPTION_MODE_ADIANTUM		9
240 
241 struct fscrypt_policy {
242 	__u8 version;
243 	__u8 contents_encryption_mode;
244 	__u8 filenames_encryption_mode;
245 	__u8 flags;
246 	__u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE];
247 };
248 
249 #define FS_IOC_SET_ENCRYPTION_POLICY	_IOR('f', 19, struct fscrypt_policy)
250 #define FS_IOC_GET_ENCRYPTION_PWSALT	_IOW('f', 20, __u8[16])
251 #define FS_IOC_GET_ENCRYPTION_POLICY	_IOW('f', 21, struct fscrypt_policy)
252 
253 /* Parameters for passing an encryption key into the kernel keyring */
254 #define FS_KEY_DESC_PREFIX		"fscrypt:"
255 #define FS_KEY_DESC_PREFIX_SIZE		8
256 
257 /* Structure that userspace passes to the kernel keyring */
258 #define FS_MAX_KEY_SIZE			64
259 
260 struct fscrypt_key {
261 	__u32 mode;
262 	__u8 raw[FS_MAX_KEY_SIZE];
263 	__u32 size;
264 };
265 
266 /*
267  * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
268  *
269  * Note: for historical reasons, these flags were originally used and
270  * defined for use by ext2/ext3, and then other file systems started
271  * using these flags so they wouldn't need to write their own version
272  * of chattr/lsattr (which was shipped as part of e2fsprogs).  You
273  * should think twice before trying to use these flags in new
274  * contexts, or trying to assign these flags, since they are used both
275  * as the UAPI and the on-disk encoding for ext2/3/4.  Also, we are
276  * almost out of 32-bit flags.  :-)
277  *
278  * We have recently hoisted FS_IOC_FSGETXATTR / FS_IOC_FSSETXATTR from
279  * XFS to the generic FS level interface.  This uses a structure that
280  * has padding and hence has more room to grow, so it may be more
281  * appropriate for many new use cases.
282  *
283  * Please do not change these flags or interfaces before checking with
284  * linux-fsdevel@vger.kernel.org and linux-api@vger.kernel.org.
285  */
286 #define	FS_SECRM_FL			0x00000001 /* Secure deletion */
287 #define	FS_UNRM_FL			0x00000002 /* Undelete */
288 #define	FS_COMPR_FL			0x00000004 /* Compress file */
289 #define FS_SYNC_FL			0x00000008 /* Synchronous updates */
290 #define FS_IMMUTABLE_FL			0x00000010 /* Immutable file */
291 #define FS_APPEND_FL			0x00000020 /* writes to file may only append */
292 #define FS_NODUMP_FL			0x00000040 /* do not dump file */
293 #define FS_NOATIME_FL			0x00000080 /* do not update atime */
294 /* Reserved for compression usage... */
295 #define FS_DIRTY_FL			0x00000100
296 #define FS_COMPRBLK_FL			0x00000200 /* One or more compressed clusters */
297 #define FS_NOCOMP_FL			0x00000400 /* Don't compress */
298 /* End compression flags --- maybe not all used */
299 #define FS_ENCRYPT_FL			0x00000800 /* Encrypted file */
300 #define FS_BTREE_FL			0x00001000 /* btree format dir */
301 #define FS_INDEX_FL			0x00001000 /* hash-indexed directory */
302 #define FS_IMAGIC_FL			0x00002000 /* AFS directory */
303 #define FS_JOURNAL_DATA_FL		0x00004000 /* Reserved for ext3 */
304 #define FS_NOTAIL_FL			0x00008000 /* file tail should not be merged */
305 #define FS_DIRSYNC_FL			0x00010000 /* dirsync behaviour (directories only) */
306 #define FS_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/
307 #define FS_HUGE_FILE_FL			0x00040000 /* Reserved for ext4 */
308 #define FS_EXTENT_FL			0x00080000 /* Extents */
309 #define FS_EA_INODE_FL			0x00200000 /* Inode used for large EA */
310 #define FS_EOFBLOCKS_FL			0x00400000 /* Reserved for ext4 */
311 #define FS_NOCOW_FL			0x00800000 /* Do not cow file */
312 #define FS_INLINE_DATA_FL		0x10000000 /* Reserved for ext4 */
313 #define FS_PROJINHERIT_FL		0x20000000 /* Create with parents projid */
314 #define FS_RESERVED_FL			0x80000000 /* reserved for ext2 lib */
315 
316 #define FS_FL_USER_VISIBLE		0x0003DFFF /* User visible flags */
317 #define FS_FL_USER_MODIFIABLE		0x000380FF /* User modifiable flags */
318 
319 
320 #define SYNC_FILE_RANGE_WAIT_BEFORE	1
321 #define SYNC_FILE_RANGE_WRITE		2
322 #define SYNC_FILE_RANGE_WAIT_AFTER	4
323 
324 /*
325  * Flags for preadv2/pwritev2:
326  */
327 
328 typedef int __bitwise __kernel_rwf_t;
329 
330 /* high priority request, poll if possible */
331 #define RWF_HIPRI	((__force __kernel_rwf_t)0x00000001)
332 
333 /* per-IO O_DSYNC */
334 #define RWF_DSYNC	((__force __kernel_rwf_t)0x00000002)
335 
336 /* per-IO O_SYNC */
337 #define RWF_SYNC	((__force __kernel_rwf_t)0x00000004)
338 
339 /* per-IO, return -EAGAIN if operation would block */
340 #define RWF_NOWAIT	((__force __kernel_rwf_t)0x00000008)
341 
342 /* per-IO O_APPEND */
343 #define RWF_APPEND	((__force __kernel_rwf_t)0x00000010)
344 
345 /* mask of flags supported by the kernel */
346 #define RWF_SUPPORTED	(RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT |\
347 			 RWF_APPEND)
348 
349 #endif /* _UAPI_LINUX_FS_H */
350