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 #ifndef __KERNEL__
17 #include <linux/fscrypt.h>
18 #endif
19
20 /* Use of MS_* flags within the kernel is restricted to core mount(2) code. */
21 #if !defined(__KERNEL__)
22 #include <linux/mount.h>
23 #endif
24
25 /*
26 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
27 * the file limit at runtime and only root can increase the per-process
28 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
29 * upper limit on files-per-process.
30 *
31 * Some programs (notably those using select()) may have to be
32 * recompiled to take full advantage of the new limits..
33 */
34
35 /* Fixed constants first: */
36 #undef NR_OPEN
37 #define INR_OPEN_CUR 1024 /* Initial setting for nfile rlimits */
38 #define INR_OPEN_MAX 4096 /* Hard limit for nfile rlimits */
39
40 #define BLOCK_SIZE_BITS 10
41 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
42
43 #define SEEK_SET 0 /* seek relative to beginning of file */
44 #define SEEK_CUR 1 /* seek relative to current file position */
45 #define SEEK_END 2 /* seek relative to end of file */
46 #define SEEK_DATA 3 /* seek to the next data */
47 #define SEEK_HOLE 4 /* seek to the next hole */
48 #define SEEK_MAX SEEK_HOLE
49
50 #define RENAME_NOREPLACE (1 << 0) /* Don't overwrite target */
51 #define RENAME_EXCHANGE (1 << 1) /* Exchange source and dest */
52 #define RENAME_WHITEOUT (1 << 2) /* Whiteout source */
53
54 struct file_clone_range {
55 __s64 src_fd;
56 __u64 src_offset;
57 __u64 src_length;
58 __u64 dest_offset;
59 };
60
61 struct fstrim_range {
62 __u64 start;
63 __u64 len;
64 __u64 minlen;
65 };
66
67 /*
68 * We include a length field because some filesystems (vfat) have an identifier
69 * that we do want to expose as a UUID, but doesn't have the standard length.
70 *
71 * We use a fixed size buffer beacuse this interface will, by fiat, never
72 * support "UUIDs" longer than 16 bytes; we don't want to force all downstream
73 * users to have to deal with that.
74 */
75 struct fsuuid2 {
76 __u8 len;
77 __u8 uuid[16];
78 };
79
80 struct fs_sysfs_path {
81 __u8 len;
82 __u8 name[128];
83 };
84
85 /* extent-same (dedupe) ioctls; these MUST match the btrfs ioctl definitions */
86 #define FILE_DEDUPE_RANGE_SAME 0
87 #define FILE_DEDUPE_RANGE_DIFFERS 1
88
89 /* from struct btrfs_ioctl_file_extent_same_info */
90 struct file_dedupe_range_info {
91 __s64 dest_fd; /* in - destination file */
92 __u64 dest_offset; /* in - start of extent in destination */
93 __u64 bytes_deduped; /* out - total # of bytes we were able
94 * to dedupe from this file. */
95 /* status of this dedupe operation:
96 * < 0 for error
97 * == FILE_DEDUPE_RANGE_SAME if dedupe succeeds
98 * == FILE_DEDUPE_RANGE_DIFFERS if data differs
99 */
100 __s32 status; /* out - see above description */
101 __u32 reserved; /* must be zero */
102 };
103
104 /* from struct btrfs_ioctl_file_extent_same_args */
105 struct file_dedupe_range {
106 __u64 src_offset; /* in - start of extent in source */
107 __u64 src_length; /* in - length of extent */
108 __u16 dest_count; /* in - total elements in info array */
109 __u16 reserved1; /* must be zero */
110 __u32 reserved2; /* must be zero */
111 struct file_dedupe_range_info info[];
112 };
113
114 /* And dynamically-tunable limits and defaults: */
115 struct files_stat_struct {
116 unsigned long nr_files; /* read only */
117 unsigned long nr_free_files; /* read only */
118 unsigned long max_files; /* tunable */
119 };
120
121 struct inodes_stat_t {
122 long nr_inodes;
123 long nr_unused;
124 long dummy[5]; /* padding for sysctl ABI compatibility */
125 };
126
127
128 #define NR_FILE 8192 /* this can well be larger on a larger system */
129
130 /*
131 * Structure for FS_IOC_FSGETXATTR[A] and FS_IOC_FSSETXATTR.
132 */
133 struct fsxattr {
134 __u32 fsx_xflags; /* xflags field value (get/set) */
135 __u32 fsx_extsize; /* extsize field value (get/set)*/
136 __u32 fsx_nextents; /* nextents field value (get) */
137 __u32 fsx_projid; /* project identifier (get/set) */
138 __u32 fsx_cowextsize; /* CoW extsize field value (get/set)*/
139 unsigned char fsx_pad[8];
140 };
141
142 /*
143 * Flags for the fsx_xflags field
144 */
145 #define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */
146 #define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */
147 #define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */
148 #define FS_XFLAG_APPEND 0x00000010 /* all writes append */
149 #define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */
150 #define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */
151 #define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */
152 #define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */
153 #define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */
154 #define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */
155 #define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */
156 #define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */
157 #define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */
158 #define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */
159 #define FS_XFLAG_DAX 0x00008000 /* use DAX for IO */
160 #define FS_XFLAG_COWEXTSIZE 0x00010000 /* CoW extent size allocator hint */
161 #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */
162
163 /* the read-only stuff doesn't really belong here, but any other place is
164 probably as bad and I don't want to create yet another include file. */
165
166 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
167 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
168 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
169 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
170 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
171 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
172 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
173 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
174 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
175 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
176 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
177 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
178 #if 0
179 #define BLKPG _IO(0x12,105)/* See blkpg.h */
180
181 /* Some people are morons. Do not use sizeof! */
182
183 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
184 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
185 /* This was here just to show that the number is taken -
186 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
187 #endif
188 /* A jump here: 108-111 have been used for various private purposes. */
189 #define BLKBSZGET _IOR(0x12,112,size_t)
190 #define BLKBSZSET _IOW(0x12,113,size_t)
191 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
192 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
193 #define BLKTRACESTART _IO(0x12,116)
194 #define BLKTRACESTOP _IO(0x12,117)
195 #define BLKTRACETEARDOWN _IO(0x12,118)
196 #define BLKDISCARD _IO(0x12,119)
197 #define BLKIOMIN _IO(0x12,120)
198 #define BLKIOOPT _IO(0x12,121)
199 #define BLKALIGNOFF _IO(0x12,122)
200 #define BLKPBSZGET _IO(0x12,123)
201 #define BLKDISCARDZEROES _IO(0x12,124)
202 #define BLKSECDISCARD _IO(0x12,125)
203 #define BLKROTATIONAL _IO(0x12,126)
204 #define BLKZEROOUT _IO(0x12,127)
205 #define BLKGETDISKSEQ _IOR(0x12,128,__u64)
206 /*
207 * A jump here: 130-136 are reserved for zoned block devices
208 * (see uapi/linux/blkzoned.h)
209 */
210
211 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
212 #define FIBMAP _IO(0x00,1) /* bmap access */
213 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
214 #define FIFREEZE _IOWR('X', 119, int) /* Freeze */
215 #define FITHAW _IOWR('X', 120, int) /* Thaw */
216 #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */
217 #define FICLONE _IOW(0x94, 9, int)
218 #define FICLONERANGE _IOW(0x94, 13, struct file_clone_range)
219 #define FIDEDUPERANGE _IOWR(0x94, 54, struct file_dedupe_range)
220
221 #define FSLABEL_MAX 256 /* Max chars for the interface; each fs may differ */
222
223 #define FS_IOC_GETFLAGS _IOR('f', 1, long)
224 #define FS_IOC_SETFLAGS _IOW('f', 2, long)
225 #define FS_IOC_GETVERSION _IOR('v', 1, long)
226 #define FS_IOC_SETVERSION _IOW('v', 2, long)
227 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
228 #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
229 #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
230 #define FS_IOC32_GETVERSION _IOR('v', 1, int)
231 #define FS_IOC32_SETVERSION _IOW('v', 2, int)
232 #define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr)
233 #define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr)
234 #define FS_IOC_GETFSLABEL _IOR(0x94, 49, char[FSLABEL_MAX])
235 #define FS_IOC_SETFSLABEL _IOW(0x94, 50, char[FSLABEL_MAX])
236 /* Returns the external filesystem UUID, the same one blkid returns */
237 #define FS_IOC_GETFSUUID _IOR(0x15, 0, struct fsuuid2)
238 /*
239 * Returns the path component under /sys/fs/ that refers to this filesystem;
240 * also /sys/kernel/debug/ for filesystems with debugfs exports
241 */
242 #define FS_IOC_GETFSSYSFSPATH _IOR(0x15, 1, struct fs_sysfs_path)
243
244 /*
245 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
246 *
247 * Note: for historical reasons, these flags were originally used and
248 * defined for use by ext2/ext3, and then other file systems started
249 * using these flags so they wouldn't need to write their own version
250 * of chattr/lsattr (which was shipped as part of e2fsprogs). You
251 * should think twice before trying to use these flags in new
252 * contexts, or trying to assign these flags, since they are used both
253 * as the UAPI and the on-disk encoding for ext2/3/4. Also, we are
254 * almost out of 32-bit flags. :-)
255 *
256 * We have recently hoisted FS_IOC_FSGETXATTR / FS_IOC_FSSETXATTR from
257 * XFS to the generic FS level interface. This uses a structure that
258 * has padding and hence has more room to grow, so it may be more
259 * appropriate for many new use cases.
260 *
261 * Please do not change these flags or interfaces before checking with
262 * linux-fsdevel@vger.kernel.org and linux-api@vger.kernel.org.
263 */
264 #define FS_SECRM_FL 0x00000001 /* Secure deletion */
265 #define FS_UNRM_FL 0x00000002 /* Undelete */
266 #define FS_COMPR_FL 0x00000004 /* Compress file */
267 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
268 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
269 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
270 #define FS_NODUMP_FL 0x00000040 /* do not dump file */
271 #define FS_NOATIME_FL 0x00000080 /* do not update atime */
272 /* Reserved for compression usage... */
273 #define FS_DIRTY_FL 0x00000100
274 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
275 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
276 /* End compression flags --- maybe not all used */
277 #define FS_ENCRYPT_FL 0x00000800 /* Encrypted file */
278 #define FS_BTREE_FL 0x00001000 /* btree format dir */
279 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
280 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
281 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
282 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
283 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
284 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
285 #define FS_HUGE_FILE_FL 0x00040000 /* Reserved for ext4 */
286 #define FS_EXTENT_FL 0x00080000 /* Extents */
287 #define FS_VERITY_FL 0x00100000 /* Verity protected inode */
288 #define FS_EA_INODE_FL 0x00200000 /* Inode used for large EA */
289 #define FS_EOFBLOCKS_FL 0x00400000 /* Reserved for ext4 */
290 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
291 #define FS_DAX_FL 0x02000000 /* Inode is DAX */
292 #define FS_INLINE_DATA_FL 0x10000000 /* Reserved for ext4 */
293 #define FS_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
294 #define FS_CASEFOLD_FL 0x40000000 /* Folder is case insensitive */
295 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
296
297 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
298 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
299
300
301 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
302 #define SYNC_FILE_RANGE_WRITE 2
303 #define SYNC_FILE_RANGE_WAIT_AFTER 4
304 #define SYNC_FILE_RANGE_WRITE_AND_WAIT (SYNC_FILE_RANGE_WRITE | \
305 SYNC_FILE_RANGE_WAIT_BEFORE | \
306 SYNC_FILE_RANGE_WAIT_AFTER)
307
308 /*
309 * Flags for preadv2/pwritev2:
310 */
311
312 typedef int __bitwise __kernel_rwf_t;
313
314 /* high priority request, poll if possible */
315 #define RWF_HIPRI ((__force __kernel_rwf_t)0x00000001)
316
317 /* per-IO O_DSYNC */
318 #define RWF_DSYNC ((__force __kernel_rwf_t)0x00000002)
319
320 /* per-IO O_SYNC */
321 #define RWF_SYNC ((__force __kernel_rwf_t)0x00000004)
322
323 /* per-IO, return -EAGAIN if operation would block */
324 #define RWF_NOWAIT ((__force __kernel_rwf_t)0x00000008)
325
326 /* per-IO O_APPEND */
327 #define RWF_APPEND ((__force __kernel_rwf_t)0x00000010)
328
329 /* per-IO negation of O_APPEND */
330 #define RWF_NOAPPEND ((__force __kernel_rwf_t)0x00000020)
331
332 /* Atomic Write */
333 #define RWF_ATOMIC ((__force __kernel_rwf_t)0x00000040)
334
335 /* mask of flags supported by the kernel */
336 #define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT |\
337 RWF_APPEND | RWF_NOAPPEND | RWF_ATOMIC)
338
339 #define PROCFS_IOCTL_MAGIC 'f'
340
341 /* Pagemap ioctl */
342 #define PAGEMAP_SCAN _IOWR(PROCFS_IOCTL_MAGIC, 16, struct pm_scan_arg)
343
344 /* Bitmasks provided in pm_scan_args masks and reported in page_region.categories. */
345 #define PAGE_IS_WPALLOWED (1 << 0)
346 #define PAGE_IS_WRITTEN (1 << 1)
347 #define PAGE_IS_FILE (1 << 2)
348 #define PAGE_IS_PRESENT (1 << 3)
349 #define PAGE_IS_SWAPPED (1 << 4)
350 #define PAGE_IS_PFNZERO (1 << 5)
351 #define PAGE_IS_HUGE (1 << 6)
352 #define PAGE_IS_SOFT_DIRTY (1 << 7)
353
354 /*
355 * struct page_region - Page region with flags
356 * @start: Start of the region
357 * @end: End of the region (exclusive)
358 * @categories: PAGE_IS_* category bitmask for the region
359 */
360 struct page_region {
361 __u64 start;
362 __u64 end;
363 __u64 categories;
364 };
365
366 /* Flags for PAGEMAP_SCAN ioctl */
367 #define PM_SCAN_WP_MATCHING (1 << 0) /* Write protect the pages matched. */
368 #define PM_SCAN_CHECK_WPASYNC (1 << 1) /* Abort the scan when a non-WP-enabled page is found. */
369
370 /*
371 * struct pm_scan_arg - Pagemap ioctl argument
372 * @size: Size of the structure
373 * @flags: Flags for the IOCTL
374 * @start: Starting address of the region
375 * @end: Ending address of the region
376 * @walk_end Address where the scan stopped (written by kernel).
377 * walk_end == end (address tags cleared) informs that the scan completed on entire range.
378 * @vec: Address of page_region struct array for output
379 * @vec_len: Length of the page_region struct array
380 * @max_pages: Optional limit for number of returned pages (0 = disabled)
381 * @category_inverted: PAGE_IS_* categories which values match if 0 instead of 1
382 * @category_mask: Skip pages for which any category doesn't match
383 * @category_anyof_mask: Skip pages for which no category matches
384 * @return_mask: PAGE_IS_* categories that are to be reported in `page_region`s returned
385 */
386 struct pm_scan_arg {
387 __u64 size;
388 __u64 flags;
389 __u64 start;
390 __u64 end;
391 __u64 walk_end;
392 __u64 vec;
393 __u64 vec_len;
394 __u64 max_pages;
395 __u64 category_inverted;
396 __u64 category_mask;
397 __u64 category_anyof_mask;
398 __u64 return_mask;
399 };
400
401 /* /proc/<pid>/maps ioctl */
402 #define PROCMAP_QUERY _IOWR(PROCFS_IOCTL_MAGIC, 17, struct procmap_query)
403
404 enum procmap_query_flags {
405 /*
406 * VMA permission flags.
407 *
408 * Can be used as part of procmap_query.query_flags field to look up
409 * only VMAs satisfying specified subset of permissions. E.g., specifying
410 * PROCMAP_QUERY_VMA_READABLE only will return both readable and read/write VMAs,
411 * while having PROCMAP_QUERY_VMA_READABLE | PROCMAP_QUERY_VMA_WRITABLE will only
412 * return read/write VMAs, though both executable/non-executable and
413 * private/shared will be ignored.
414 *
415 * PROCMAP_QUERY_VMA_* flags are also returned in procmap_query.vma_flags
416 * field to specify actual VMA permissions.
417 */
418 PROCMAP_QUERY_VMA_READABLE = 0x01,
419 PROCMAP_QUERY_VMA_WRITABLE = 0x02,
420 PROCMAP_QUERY_VMA_EXECUTABLE = 0x04,
421 PROCMAP_QUERY_VMA_SHARED = 0x08,
422 /*
423 * Query modifier flags.
424 *
425 * By default VMA that covers provided address is returned, or -ENOENT
426 * is returned. With PROCMAP_QUERY_COVERING_OR_NEXT_VMA flag set, closest
427 * VMA with vma_start > addr will be returned if no covering VMA is
428 * found.
429 *
430 * PROCMAP_QUERY_FILE_BACKED_VMA instructs query to consider only VMAs that
431 * have file backing. Can be combined with PROCMAP_QUERY_COVERING_OR_NEXT_VMA
432 * to iterate all VMAs with file backing.
433 */
434 PROCMAP_QUERY_COVERING_OR_NEXT_VMA = 0x10,
435 PROCMAP_QUERY_FILE_BACKED_VMA = 0x20,
436 };
437
438 /*
439 * Input/output argument structured passed into ioctl() call. It can be used
440 * to query a set of VMAs (Virtual Memory Areas) of a process.
441 *
442 * Each field can be one of three kinds, marked in a short comment to the
443 * right of the field:
444 * - "in", input argument, user has to provide this value, kernel doesn't modify it;
445 * - "out", output argument, kernel sets this field with VMA data;
446 * - "in/out", input and output argument; user provides initial value (used
447 * to specify maximum allowable buffer size), and kernel sets it to actual
448 * amount of data written (or zero, if there is no data).
449 *
450 * If matching VMA is found (according to criterias specified by
451 * query_addr/query_flags, all the out fields are filled out, and ioctl()
452 * returns 0. If there is no matching VMA, -ENOENT will be returned.
453 * In case of any other error, negative error code other than -ENOENT is
454 * returned.
455 *
456 * Most of the data is similar to the one returned as text in /proc/<pid>/maps
457 * file, but procmap_query provides more querying flexibility. There are no
458 * consistency guarantees between subsequent ioctl() calls, but data returned
459 * for matched VMA is self-consistent.
460 */
461 struct procmap_query {
462 /* Query struct size, for backwards/forward compatibility */
463 __u64 size;
464 /*
465 * Query flags, a combination of enum procmap_query_flags values.
466 * Defines query filtering and behavior, see enum procmap_query_flags.
467 *
468 * Input argument, provided by user. Kernel doesn't modify it.
469 */
470 __u64 query_flags; /* in */
471 /*
472 * Query address. By default, VMA that covers this address will
473 * be looked up. PROCMAP_QUERY_* flags above modify this default
474 * behavior further.
475 *
476 * Input argument, provided by user. Kernel doesn't modify it.
477 */
478 __u64 query_addr; /* in */
479 /* VMA starting (inclusive) and ending (exclusive) address, if VMA is found. */
480 __u64 vma_start; /* out */
481 __u64 vma_end; /* out */
482 /* VMA permissions flags. A combination of PROCMAP_QUERY_VMA_* flags. */
483 __u64 vma_flags; /* out */
484 /* VMA backing page size granularity. */
485 __u64 vma_page_size; /* out */
486 /*
487 * VMA file offset. If VMA has file backing, this specifies offset
488 * within the file that VMA's start address corresponds to.
489 * Is set to zero if VMA has no backing file.
490 */
491 __u64 vma_offset; /* out */
492 /* Backing file's inode number, or zero, if VMA has no backing file. */
493 __u64 inode; /* out */
494 /* Backing file's device major/minor number, or zero, if VMA has no backing file. */
495 __u32 dev_major; /* out */
496 __u32 dev_minor; /* out */
497 /*
498 * If set to non-zero value, signals the request to return VMA name
499 * (i.e., VMA's backing file's absolute path, with " (deleted)" suffix
500 * appended, if file was unlinked from FS) for matched VMA. VMA name
501 * can also be some special name (e.g., "[heap]", "[stack]") or could
502 * be even user-supplied with prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME).
503 *
504 * Kernel will set this field to zero, if VMA has no associated name.
505 * Otherwise kernel will return actual amount of bytes filled in
506 * user-supplied buffer (see vma_name_addr field below), including the
507 * terminating zero.
508 *
509 * If VMA name is longer that user-supplied maximum buffer size,
510 * -E2BIG error is returned.
511 *
512 * If this field is set to non-zero value, vma_name_addr should point
513 * to valid user space memory buffer of at least vma_name_size bytes.
514 * If set to zero, vma_name_addr should be set to zero as well
515 */
516 __u32 vma_name_size; /* in/out */
517 /*
518 * If set to non-zero value, signals the request to extract and return
519 * VMA's backing file's build ID, if the backing file is an ELF file
520 * and it contains embedded build ID.
521 *
522 * Kernel will set this field to zero, if VMA has no backing file,
523 * backing file is not an ELF file, or ELF file has no build ID
524 * embedded.
525 *
526 * Build ID is a binary value (not a string). Kernel will set
527 * build_id_size field to exact number of bytes used for build ID.
528 * If build ID is requested and present, but needs more bytes than
529 * user-supplied maximum buffer size (see build_id_addr field below),
530 * -E2BIG error will be returned.
531 *
532 * If this field is set to non-zero value, build_id_addr should point
533 * to valid user space memory buffer of at least build_id_size bytes.
534 * If set to zero, build_id_addr should be set to zero as well
535 */
536 __u32 build_id_size; /* in/out */
537 /*
538 * User-supplied address of a buffer of at least vma_name_size bytes
539 * for kernel to fill with matched VMA's name (see vma_name_size field
540 * description above for details).
541 *
542 * Should be set to zero if VMA name should not be returned.
543 */
544 __u64 vma_name_addr; /* in */
545 /*
546 * User-supplied address of a buffer of at least build_id_size bytes
547 * for kernel to fill with matched VMA's ELF build ID, if available
548 * (see build_id_size field description above for details).
549 *
550 * Should be set to zero if build ID should not be returned.
551 */
552 __u64 build_id_addr; /* in */
553 };
554
555 #endif /* _UAPI_LINUX_FS_H */
556
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