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oasis-root

Compiled tree of Oasis Linux based on own branch at <https://hacktivis.me/git/oasis/> git clone https://anongit.hacktivis.me/git/oasis-root.git

fs.h (21733B)


  1. /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
  2. #ifndef _LINUX_FS_H
  3. #define _LINUX_FS_H
  4. /*
  5. * This file has definitions for some important file table structures
  6. * and constants and structures used by various generic file system
  7. * ioctl's. Please do not make any changes in this file before
  8. * sending patches for review to linux-fsdevel@vger.kernel.org and
  9. * linux-api@vger.kernel.org.
  10. */
  11. #include <linux/limits.h>
  12. #include <linux/ioctl.h>
  13. #include <linux/types.h>
  14. #include <linux/fscrypt.h>
  15. /* Use of MS_* flags within the kernel is restricted to core mount(2) code. */
  16. #include <linux/mount.h>
  17. /*
  18. * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
  19. * the file limit at runtime and only root can increase the per-process
  20. * nr_file rlimit, so it's safe to set up a ridiculously high absolute
  21. * upper limit on files-per-process.
  22. *
  23. * Some programs (notably those using select()) may have to be
  24. * recompiled to take full advantage of the new limits..
  25. */
  26. /* Fixed constants first: */
  27. #undef NR_OPEN
  28. #define INR_OPEN_CUR 1024 /* Initial setting for nfile rlimits */
  29. #define INR_OPEN_MAX 4096 /* Hard limit for nfile rlimits */
  30. #define BLOCK_SIZE_BITS 10
  31. #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
  32. #define SEEK_SET 0 /* seek relative to beginning of file */
  33. #define SEEK_CUR 1 /* seek relative to current file position */
  34. #define SEEK_END 2 /* seek relative to end of file */
  35. #define SEEK_DATA 3 /* seek to the next data */
  36. #define SEEK_HOLE 4 /* seek to the next hole */
  37. #define SEEK_MAX SEEK_HOLE
  38. #define RENAME_NOREPLACE (1 << 0) /* Don't overwrite target */
  39. #define RENAME_EXCHANGE (1 << 1) /* Exchange source and dest */
  40. #define RENAME_WHITEOUT (1 << 2) /* Whiteout source */
  41. struct file_clone_range {
  42. __s64 src_fd;
  43. __u64 src_offset;
  44. __u64 src_length;
  45. __u64 dest_offset;
  46. };
  47. struct fstrim_range {
  48. __u64 start;
  49. __u64 len;
  50. __u64 minlen;
  51. };
  52. /*
  53. * We include a length field because some filesystems (vfat) have an identifier
  54. * that we do want to expose as a UUID, but doesn't have the standard length.
  55. *
  56. * We use a fixed size buffer beacuse this interface will, by fiat, never
  57. * support "UUIDs" longer than 16 bytes; we don't want to force all downstream
  58. * users to have to deal with that.
  59. */
  60. struct fsuuid2 {
  61. __u8 len;
  62. __u8 uuid[16];
  63. };
  64. struct fs_sysfs_path {
  65. __u8 len;
  66. __u8 name[128];
  67. };
  68. /* extent-same (dedupe) ioctls; these MUST match the btrfs ioctl definitions */
  69. #define FILE_DEDUPE_RANGE_SAME 0
  70. #define FILE_DEDUPE_RANGE_DIFFERS 1
  71. /* from struct btrfs_ioctl_file_extent_same_info */
  72. struct file_dedupe_range_info {
  73. __s64 dest_fd; /* in - destination file */
  74. __u64 dest_offset; /* in - start of extent in destination */
  75. __u64 bytes_deduped; /* out - total # of bytes we were able
  76. * to dedupe from this file. */
  77. /* status of this dedupe operation:
  78. * < 0 for error
  79. * == FILE_DEDUPE_RANGE_SAME if dedupe succeeds
  80. * == FILE_DEDUPE_RANGE_DIFFERS if data differs
  81. */
  82. __s32 status; /* out - see above description */
  83. __u32 reserved; /* must be zero */
  84. };
  85. /* from struct btrfs_ioctl_file_extent_same_args */
  86. struct file_dedupe_range {
  87. __u64 src_offset; /* in - start of extent in source */
  88. __u64 src_length; /* in - length of extent */
  89. __u16 dest_count; /* in - total elements in info array */
  90. __u16 reserved1; /* must be zero */
  91. __u32 reserved2; /* must be zero */
  92. struct file_dedupe_range_info info[];
  93. };
  94. /* And dynamically-tunable limits and defaults: */
  95. struct files_stat_struct {
  96. unsigned long nr_files; /* read only */
  97. unsigned long nr_free_files; /* read only */
  98. unsigned long max_files; /* tunable */
  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. #define NR_FILE 8192 /* this can well be larger on a larger system */
  106. /*
  107. * Structure for FS_IOC_FSGETXATTR[A] and FS_IOC_FSSETXATTR.
  108. */
  109. struct fsxattr {
  110. __u32 fsx_xflags; /* xflags field value (get/set) */
  111. __u32 fsx_extsize; /* extsize field value (get/set)*/
  112. __u32 fsx_nextents; /* nextents field value (get) */
  113. __u32 fsx_projid; /* project identifier (get/set) */
  114. __u32 fsx_cowextsize; /* CoW extsize field value (get/set)*/
  115. unsigned char fsx_pad[8];
  116. };
  117. /*
  118. * Flags for the fsx_xflags field
  119. */
  120. #define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */
  121. #define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */
  122. #define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */
  123. #define FS_XFLAG_APPEND 0x00000010 /* all writes append */
  124. #define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */
  125. #define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */
  126. #define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */
  127. #define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */
  128. #define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */
  129. #define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */
  130. #define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */
  131. #define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */
  132. #define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */
  133. #define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */
  134. #define FS_XFLAG_DAX 0x00008000 /* use DAX for IO */
  135. #define FS_XFLAG_COWEXTSIZE 0x00010000 /* CoW extent size allocator hint */
  136. #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */
  137. /* the read-only stuff doesn't really belong here, but any other place is
  138. probably as bad and I don't want to create yet another include file. */
  139. #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
  140. #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
  141. #define BLKRRPART _IO(0x12,95) /* re-read partition table */
  142. #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
  143. #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
  144. #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
  145. #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
  146. #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
  147. #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
  148. #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
  149. #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
  150. #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
  151. #if 0
  152. #define BLKPG _IO(0x12,105)/* See blkpg.h */
  153. /* Some people are morons. Do not use sizeof! */
  154. #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
  155. #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
  156. /* This was here just to show that the number is taken -
  157. probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
  158. #endif
  159. /* A jump here: 108-111 have been used for various private purposes. */
  160. #define BLKBSZGET _IOR(0x12,112,size_t)
  161. #define BLKBSZSET _IOW(0x12,113,size_t)
  162. #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
  163. #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
  164. #define BLKTRACESTART _IO(0x12,116)
  165. #define BLKTRACESTOP _IO(0x12,117)
  166. #define BLKTRACETEARDOWN _IO(0x12,118)
  167. #define BLKDISCARD _IO(0x12,119)
  168. #define BLKIOMIN _IO(0x12,120)
  169. #define BLKIOOPT _IO(0x12,121)
  170. #define BLKALIGNOFF _IO(0x12,122)
  171. #define BLKPBSZGET _IO(0x12,123)
  172. #define BLKDISCARDZEROES _IO(0x12,124)
  173. #define BLKSECDISCARD _IO(0x12,125)
  174. #define BLKROTATIONAL _IO(0x12,126)
  175. #define BLKZEROOUT _IO(0x12,127)
  176. #define BLKGETDISKSEQ _IOR(0x12,128,__u64)
  177. /*
  178. * A jump here: 130-136 are reserved for zoned block devices
  179. * (see uapi/linux/blkzoned.h)
  180. */
  181. #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
  182. #define FIBMAP _IO(0x00,1) /* bmap access */
  183. #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
  184. #define FIFREEZE _IOWR('X', 119, int) /* Freeze */
  185. #define FITHAW _IOWR('X', 120, int) /* Thaw */
  186. #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */
  187. #define FICLONE _IOW(0x94, 9, int)
  188. #define FICLONERANGE _IOW(0x94, 13, struct file_clone_range)
  189. #define FIDEDUPERANGE _IOWR(0x94, 54, struct file_dedupe_range)
  190. #define FSLABEL_MAX 256 /* Max chars for the interface; each fs may differ */
  191. #define FS_IOC_GETFLAGS _IOR('f', 1, long)
  192. #define FS_IOC_SETFLAGS _IOW('f', 2, long)
  193. #define FS_IOC_GETVERSION _IOR('v', 1, long)
  194. #define FS_IOC_SETVERSION _IOW('v', 2, long)
  195. #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
  196. #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
  197. #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
  198. #define FS_IOC32_GETVERSION _IOR('v', 1, int)
  199. #define FS_IOC32_SETVERSION _IOW('v', 2, int)
  200. #define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr)
  201. #define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr)
  202. #define FS_IOC_GETFSLABEL _IOR(0x94, 49, char[FSLABEL_MAX])
  203. #define FS_IOC_SETFSLABEL _IOW(0x94, 50, char[FSLABEL_MAX])
  204. /* Returns the external filesystem UUID, the same one blkid returns */
  205. #define FS_IOC_GETFSUUID _IOR(0x15, 0, struct fsuuid2)
  206. /*
  207. * Returns the path component under /sys/fs/ that refers to this filesystem;
  208. * also /sys/kernel/debug/ for filesystems with debugfs exports
  209. */
  210. #define FS_IOC_GETFSSYSFSPATH _IOR(0x15, 1, struct fs_sysfs_path)
  211. /*
  212. * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
  213. *
  214. * Note: for historical reasons, these flags were originally used and
  215. * defined for use by ext2/ext3, and then other file systems started
  216. * using these flags so they wouldn't need to write their own version
  217. * of chattr/lsattr (which was shipped as part of e2fsprogs). You
  218. * should think twice before trying to use these flags in new
  219. * contexts, or trying to assign these flags, since they are used both
  220. * as the UAPI and the on-disk encoding for ext2/3/4. Also, we are
  221. * almost out of 32-bit flags. :-)
  222. *
  223. * We have recently hoisted FS_IOC_FSGETXATTR / FS_IOC_FSSETXATTR from
  224. * XFS to the generic FS level interface. This uses a structure that
  225. * has padding and hence has more room to grow, so it may be more
  226. * appropriate for many new use cases.
  227. *
  228. * Please do not change these flags or interfaces before checking with
  229. * linux-fsdevel@vger.kernel.org and linux-api@vger.kernel.org.
  230. */
  231. #define FS_SECRM_FL 0x00000001 /* Secure deletion */
  232. #define FS_UNRM_FL 0x00000002 /* Undelete */
  233. #define FS_COMPR_FL 0x00000004 /* Compress file */
  234. #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
  235. #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
  236. #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
  237. #define FS_NODUMP_FL 0x00000040 /* do not dump file */
  238. #define FS_NOATIME_FL 0x00000080 /* do not update atime */
  239. /* Reserved for compression usage... */
  240. #define FS_DIRTY_FL 0x00000100
  241. #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
  242. #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
  243. /* End compression flags --- maybe not all used */
  244. #define FS_ENCRYPT_FL 0x00000800 /* Encrypted file */
  245. #define FS_BTREE_FL 0x00001000 /* btree format dir */
  246. #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
  247. #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
  248. #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
  249. #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
  250. #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
  251. #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
  252. #define FS_HUGE_FILE_FL 0x00040000 /* Reserved for ext4 */
  253. #define FS_EXTENT_FL 0x00080000 /* Extents */
  254. #define FS_VERITY_FL 0x00100000 /* Verity protected inode */
  255. #define FS_EA_INODE_FL 0x00200000 /* Inode used for large EA */
  256. #define FS_EOFBLOCKS_FL 0x00400000 /* Reserved for ext4 */
  257. #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
  258. #define FS_DAX_FL 0x02000000 /* Inode is DAX */
  259. #define FS_INLINE_DATA_FL 0x10000000 /* Reserved for ext4 */
  260. #define FS_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
  261. #define FS_CASEFOLD_FL 0x40000000 /* Folder is case insensitive */
  262. #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
  263. #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
  264. #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
  265. #define SYNC_FILE_RANGE_WAIT_BEFORE 1
  266. #define SYNC_FILE_RANGE_WRITE 2
  267. #define SYNC_FILE_RANGE_WAIT_AFTER 4
  268. #define SYNC_FILE_RANGE_WRITE_AND_WAIT (SYNC_FILE_RANGE_WRITE | \
  269. SYNC_FILE_RANGE_WAIT_BEFORE | \
  270. SYNC_FILE_RANGE_WAIT_AFTER)
  271. /*
  272. * Flags for preadv2/pwritev2:
  273. */
  274. typedef int __bitwise __kernel_rwf_t;
  275. /* high priority request, poll if possible */
  276. #define RWF_HIPRI ((__kernel_rwf_t)0x00000001)
  277. /* per-IO O_DSYNC */
  278. #define RWF_DSYNC ((__kernel_rwf_t)0x00000002)
  279. /* per-IO O_SYNC */
  280. #define RWF_SYNC ((__kernel_rwf_t)0x00000004)
  281. /* per-IO, return -EAGAIN if operation would block */
  282. #define RWF_NOWAIT ((__kernel_rwf_t)0x00000008)
  283. /* per-IO O_APPEND */
  284. #define RWF_APPEND ((__kernel_rwf_t)0x00000010)
  285. /* per-IO negation of O_APPEND */
  286. #define RWF_NOAPPEND ((__kernel_rwf_t)0x00000020)
  287. /* Atomic Write */
  288. #define RWF_ATOMIC ((__kernel_rwf_t)0x00000040)
  289. /* mask of flags supported by the kernel */
  290. #define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT |\
  291. RWF_APPEND | RWF_NOAPPEND | RWF_ATOMIC)
  292. #define PROCFS_IOCTL_MAGIC 'f'
  293. /* Pagemap ioctl */
  294. #define PAGEMAP_SCAN _IOWR(PROCFS_IOCTL_MAGIC, 16, struct pm_scan_arg)
  295. /* Bitmasks provided in pm_scan_args masks and reported in page_region.categories. */
  296. #define PAGE_IS_WPALLOWED (1 << 0)
  297. #define PAGE_IS_WRITTEN (1 << 1)
  298. #define PAGE_IS_FILE (1 << 2)
  299. #define PAGE_IS_PRESENT (1 << 3)
  300. #define PAGE_IS_SWAPPED (1 << 4)
  301. #define PAGE_IS_PFNZERO (1 << 5)
  302. #define PAGE_IS_HUGE (1 << 6)
  303. #define PAGE_IS_SOFT_DIRTY (1 << 7)
  304. /*
  305. * struct page_region - Page region with flags
  306. * @start: Start of the region
  307. * @end: End of the region (exclusive)
  308. * @categories: PAGE_IS_* category bitmask for the region
  309. */
  310. struct page_region {
  311. __u64 start;
  312. __u64 end;
  313. __u64 categories;
  314. };
  315. /* Flags for PAGEMAP_SCAN ioctl */
  316. #define PM_SCAN_WP_MATCHING (1 << 0) /* Write protect the pages matched. */
  317. #define PM_SCAN_CHECK_WPASYNC (1 << 1) /* Abort the scan when a non-WP-enabled page is found. */
  318. /*
  319. * struct pm_scan_arg - Pagemap ioctl argument
  320. * @size: Size of the structure
  321. * @flags: Flags for the IOCTL
  322. * @start: Starting address of the region
  323. * @end: Ending address of the region
  324. * @walk_end Address where the scan stopped (written by kernel).
  325. * walk_end == end (address tags cleared) informs that the scan completed on entire range.
  326. * @vec: Address of page_region struct array for output
  327. * @vec_len: Length of the page_region struct array
  328. * @max_pages: Optional limit for number of returned pages (0 = disabled)
  329. * @category_inverted: PAGE_IS_* categories which values match if 0 instead of 1
  330. * @category_mask: Skip pages for which any category doesn't match
  331. * @category_anyof_mask: Skip pages for which no category matches
  332. * @return_mask: PAGE_IS_* categories that are to be reported in `page_region`s returned
  333. */
  334. struct pm_scan_arg {
  335. __u64 size;
  336. __u64 flags;
  337. __u64 start;
  338. __u64 end;
  339. __u64 walk_end;
  340. __u64 vec;
  341. __u64 vec_len;
  342. __u64 max_pages;
  343. __u64 category_inverted;
  344. __u64 category_mask;
  345. __u64 category_anyof_mask;
  346. __u64 return_mask;
  347. };
  348. /* /proc/<pid>/maps ioctl */
  349. #define PROCMAP_QUERY _IOWR(PROCFS_IOCTL_MAGIC, 17, struct procmap_query)
  350. enum procmap_query_flags {
  351. /*
  352. * VMA permission flags.
  353. *
  354. * Can be used as part of procmap_query.query_flags field to look up
  355. * only VMAs satisfying specified subset of permissions. E.g., specifying
  356. * PROCMAP_QUERY_VMA_READABLE only will return both readable and read/write VMAs,
  357. * while having PROCMAP_QUERY_VMA_READABLE | PROCMAP_QUERY_VMA_WRITABLE will only
  358. * return read/write VMAs, though both executable/non-executable and
  359. * private/shared will be ignored.
  360. *
  361. * PROCMAP_QUERY_VMA_* flags are also returned in procmap_query.vma_flags
  362. * field to specify actual VMA permissions.
  363. */
  364. PROCMAP_QUERY_VMA_READABLE = 0x01,
  365. PROCMAP_QUERY_VMA_WRITABLE = 0x02,
  366. PROCMAP_QUERY_VMA_EXECUTABLE = 0x04,
  367. PROCMAP_QUERY_VMA_SHARED = 0x08,
  368. /*
  369. * Query modifier flags.
  370. *
  371. * By default VMA that covers provided address is returned, or -ENOENT
  372. * is returned. With PROCMAP_QUERY_COVERING_OR_NEXT_VMA flag set, closest
  373. * VMA with vma_start > addr will be returned if no covering VMA is
  374. * found.
  375. *
  376. * PROCMAP_QUERY_FILE_BACKED_VMA instructs query to consider only VMAs that
  377. * have file backing. Can be combined with PROCMAP_QUERY_COVERING_OR_NEXT_VMA
  378. * to iterate all VMAs with file backing.
  379. */
  380. PROCMAP_QUERY_COVERING_OR_NEXT_VMA = 0x10,
  381. PROCMAP_QUERY_FILE_BACKED_VMA = 0x20,
  382. };
  383. /*
  384. * Input/output argument structured passed into ioctl() call. It can be used
  385. * to query a set of VMAs (Virtual Memory Areas) of a process.
  386. *
  387. * Each field can be one of three kinds, marked in a short comment to the
  388. * right of the field:
  389. * - "in", input argument, user has to provide this value, kernel doesn't modify it;
  390. * - "out", output argument, kernel sets this field with VMA data;
  391. * - "in/out", input and output argument; user provides initial value (used
  392. * to specify maximum allowable buffer size), and kernel sets it to actual
  393. * amount of data written (or zero, if there is no data).
  394. *
  395. * If matching VMA is found (according to criterias specified by
  396. * query_addr/query_flags, all the out fields are filled out, and ioctl()
  397. * returns 0. If there is no matching VMA, -ENOENT will be returned.
  398. * In case of any other error, negative error code other than -ENOENT is
  399. * returned.
  400. *
  401. * Most of the data is similar to the one returned as text in /proc/<pid>/maps
  402. * file, but procmap_query provides more querying flexibility. There are no
  403. * consistency guarantees between subsequent ioctl() calls, but data returned
  404. * for matched VMA is self-consistent.
  405. */
  406. struct procmap_query {
  407. /* Query struct size, for backwards/forward compatibility */
  408. __u64 size;
  409. /*
  410. * Query flags, a combination of enum procmap_query_flags values.
  411. * Defines query filtering and behavior, see enum procmap_query_flags.
  412. *
  413. * Input argument, provided by user. Kernel doesn't modify it.
  414. */
  415. __u64 query_flags; /* in */
  416. /*
  417. * Query address. By default, VMA that covers this address will
  418. * be looked up. PROCMAP_QUERY_* flags above modify this default
  419. * behavior further.
  420. *
  421. * Input argument, provided by user. Kernel doesn't modify it.
  422. */
  423. __u64 query_addr; /* in */
  424. /* VMA starting (inclusive) and ending (exclusive) address, if VMA is found. */
  425. __u64 vma_start; /* out */
  426. __u64 vma_end; /* out */
  427. /* VMA permissions flags. A combination of PROCMAP_QUERY_VMA_* flags. */
  428. __u64 vma_flags; /* out */
  429. /* VMA backing page size granularity. */
  430. __u64 vma_page_size; /* out */
  431. /*
  432. * VMA file offset. If VMA has file backing, this specifies offset
  433. * within the file that VMA's start address corresponds to.
  434. * Is set to zero if VMA has no backing file.
  435. */
  436. __u64 vma_offset; /* out */
  437. /* Backing file's inode number, or zero, if VMA has no backing file. */
  438. __u64 inode; /* out */
  439. /* Backing file's device major/minor number, or zero, if VMA has no backing file. */
  440. __u32 dev_major; /* out */
  441. __u32 dev_minor; /* out */
  442. /*
  443. * If set to non-zero value, signals the request to return VMA name
  444. * (i.e., VMA's backing file's absolute path, with " (deleted)" suffix
  445. * appended, if file was unlinked from FS) for matched VMA. VMA name
  446. * can also be some special name (e.g., "[heap]", "[stack]") or could
  447. * be even user-supplied with prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME).
  448. *
  449. * Kernel will set this field to zero, if VMA has no associated name.
  450. * Otherwise kernel will return actual amount of bytes filled in
  451. * user-supplied buffer (see vma_name_addr field below), including the
  452. * terminating zero.
  453. *
  454. * If VMA name is longer that user-supplied maximum buffer size,
  455. * -E2BIG error is returned.
  456. *
  457. * If this field is set to non-zero value, vma_name_addr should point
  458. * to valid user space memory buffer of at least vma_name_size bytes.
  459. * If set to zero, vma_name_addr should be set to zero as well
  460. */
  461. __u32 vma_name_size; /* in/out */
  462. /*
  463. * If set to non-zero value, signals the request to extract and return
  464. * VMA's backing file's build ID, if the backing file is an ELF file
  465. * and it contains embedded build ID.
  466. *
  467. * Kernel will set this field to zero, if VMA has no backing file,
  468. * backing file is not an ELF file, or ELF file has no build ID
  469. * embedded.
  470. *
  471. * Build ID is a binary value (not a string). Kernel will set
  472. * build_id_size field to exact number of bytes used for build ID.
  473. * If build ID is requested and present, but needs more bytes than
  474. * user-supplied maximum buffer size (see build_id_addr field below),
  475. * -E2BIG error will be returned.
  476. *
  477. * If this field is set to non-zero value, build_id_addr should point
  478. * to valid user space memory buffer of at least build_id_size bytes.
  479. * If set to zero, build_id_addr should be set to zero as well
  480. */
  481. __u32 build_id_size; /* in/out */
  482. /*
  483. * User-supplied address of a buffer of at least vma_name_size bytes
  484. * for kernel to fill with matched VMA's name (see vma_name_size field
  485. * description above for details).
  486. *
  487. * Should be set to zero if VMA name should not be returned.
  488. */
  489. __u64 vma_name_addr; /* in */
  490. /*
  491. * User-supplied address of a buffer of at least build_id_size bytes
  492. * for kernel to fill with matched VMA's ELF build ID, if available
  493. * (see build_id_size field description above for details).
  494. *
  495. * Should be set to zero if build ID should not be returned.
  496. */
  497. __u64 build_id_addr; /* in */
  498. };
  499. #endif /* _LINUX_FS_H */