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1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */2#ifndef _UAPI_LINUX_FS_H3#define _UAPI_LINUX_FS_H4 5/*6 * This file has definitions for some important file table structures7 * and constants and structures used by various generic file system8 * ioctl's. Please do not make any changes in this file before9 * sending patches for review to linux-fsdevel@vger.kernel.org and10 * 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#endif19 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#endif24 25/*26 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change27 * the file limit at runtime and only root can increase the per-process28 * nr_file rlimit, so it's safe to set up a ridiculously high absolute29 * 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_OPEN37#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 1041#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_HOLE49 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 54struct file_clone_range {55 __s64 src_fd;56 __u64 src_offset;57 __u64 src_length;58 __u64 dest_offset;59};60 61struct 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 identifier69 * 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, never72 * support "UUIDs" longer than 16 bytes; we don't want to force all downstream73 * users to have to deal with that.74 */75struct fsuuid2 {76 __u8 len;77 __u8 uuid[16];78};79 80struct 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 087#define FILE_DEDUPE_RANGE_DIFFERS 188 89/* from struct btrfs_ioctl_file_extent_same_info */90struct 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 able94 * to dedupe from this file. */95 /* status of this dedupe operation:96 * < 0 for error97 * == FILE_DEDUPE_RANGE_SAME if dedupe succeeds98 * == FILE_DEDUPE_RANGE_DIFFERS if data differs99 */100 __s32 status; /* out - see above description */101 __u32 reserved; /* must be zero */102};103 104/* from struct btrfs_ioctl_file_extent_same_args */105struct 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: */115struct 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 121struct 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 */133struct 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 field144 */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 is164 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 0179#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#endif188/* 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 devices208 * (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 exports241 */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 and248 * defined for use by ext2/ext3, and then other file systems started249 * using these flags so they wouldn't need to write their own version250 * of chattr/lsattr (which was shipped as part of e2fsprogs). You251 * should think twice before trying to use these flags in new252 * contexts, or trying to assign these flags, since they are used both253 * as the UAPI and the on-disk encoding for ext2/3/4. Also, we are254 * almost out of 32-bit flags. :-)255 *256 * We have recently hoisted FS_IOC_FSGETXATTR / FS_IOC_FSSETXATTR from257 * XFS to the generic FS level interface. This uses a structure that258 * has padding and hence has more room to grow, so it may be more259 * appropriate for many new use cases.260 *261 * Please do not change these flags or interfaces before checking with262 * 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 0x00000100274#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 1302#define SYNC_FILE_RANGE_WRITE 2303#define SYNC_FILE_RANGE_WAIT_AFTER 4304#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 312typedef 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 flags356 * @start: Start of the region357 * @end: End of the region (exclusive)358 * @categories: PAGE_IS_* category bitmask for the region359 */360struct 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 argument372 * @size: Size of the structure373 * @flags: Flags for the IOCTL374 * @start: Starting address of the region375 * @end: Ending address of the region376 * @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 output379 * @vec_len: Length of the page_region struct array380 * @max_pages: Optional limit for number of returned pages (0 = disabled)381 * @category_inverted: PAGE_IS_* categories which values match if 0 instead of 1382 * @category_mask: Skip pages for which any category doesn't match383 * @category_anyof_mask: Skip pages for which no category matches384 * @return_mask: PAGE_IS_* categories that are to be reported in `page_region`s returned385 */386struct 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 404enum procmap_query_flags {405 /*406 * VMA permission flags.407 *408 * Can be used as part of procmap_query.query_flags field to look up409 * only VMAs satisfying specified subset of permissions. E.g., specifying410 * 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 only412 * return read/write VMAs, though both executable/non-executable and413 * private/shared will be ignored.414 *415 * PROCMAP_QUERY_VMA_* flags are also returned in procmap_query.vma_flags416 * 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 -ENOENT426 * is returned. With PROCMAP_QUERY_COVERING_OR_NEXT_VMA flag set, closest427 * VMA with vma_start > addr will be returned if no covering VMA is428 * found.429 *430 * PROCMAP_QUERY_FILE_BACKED_VMA instructs query to consider only VMAs that431 * have file backing. Can be combined with PROCMAP_QUERY_COVERING_OR_NEXT_VMA432 * 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 used440 * 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 the443 * 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 (used447 * to specify maximum allowable buffer size), and kernel sets it to actual448 * amount of data written (or zero, if there is no data).449 *450 * If matching VMA is found (according to criterias specified by451 * 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 is454 * returned.455 *456 * Most of the data is similar to the one returned as text in /proc/<pid>/maps457 * file, but procmap_query provides more querying flexibility. There are no458 * consistency guarantees between subsequent ioctl() calls, but data returned459 * for matched VMA is self-consistent.460 */461struct 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 will473 * be looked up. PROCMAP_QUERY_* flags above modify this default474 * 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 offset488 * 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 name499 * (i.e., VMA's backing file's absolute path, with " (deleted)" suffix500 * appended, if file was unlinked from FS) for matched VMA. VMA name501 * can also be some special name (e.g., "[heap]", "[stack]") or could502 * 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 in506 * user-supplied buffer (see vma_name_addr field below), including the507 * 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 point513 * 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 well515 */516 __u32 vma_name_size; /* in/out */517 /*518 * If set to non-zero value, signals the request to extract and return519 * VMA's backing file's build ID, if the backing file is an ELF file520 * 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 ID524 * embedded.525 *526 * Build ID is a binary value (not a string). Kernel will set527 * 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 than529 * 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 point533 * 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 well535 */536 __u32 build_id_size; /* in/out */537 /*538 * User-supplied address of a buffer of at least vma_name_size bytes539 * for kernel to fill with matched VMA's name (see vma_name_size field540 * 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 bytes547 * for kernel to fill with matched VMA's ELF build ID, if available548 * (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