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/* * This file has definitions for some important file table structures * and constants and structures used by various generic file system * ioctl's. Please do not make any changes in this file before * sending patches for review to linux-fsdevel@vger.kernel.org and * linux-api@vger.kernel.org. */
#include <linux/limits.h>#include <linux/ioctl.h>#include <linux/types.h>#ifndef __KERNEL__#include <linux/fscrypt.h>#endif
/* Use of MS_* flags within the kernel is restricted to core mount(2) code. */#if !defined(__KERNEL__)#include <linux/mount.h>#endif
/* * It's silly to have NR_OPEN bigger than NR_FILE, but you can change * the file limit at runtime and only root can increase the per-process * nr_file rlimit, so it's safe to set up a ridiculously high absolute * upper limit on files-per-process. * * Some programs (notably those using select()) may have to be * recompiled to take full advantage of the new limits.. */
/* Fixed constants first: */#undef NR_OPEN#define INR_OPEN_CUR 1024 /* Initial setting for nfile rlimits */#define INR_OPEN_MAX 4096 /* Hard limit for nfile rlimits */
#define BLOCK_SIZE_BITS 10#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
/* flags for integrity meta */#define IO_INTEGRITY_CHK_GUARD (1U << 0) /* enforce guard check */#define IO_INTEGRITY_CHK_REFTAG (1U << 1) /* enforce ref check */#define IO_INTEGRITY_CHK_APPTAG (1U << 2) /* enforce app check */
#define IO_INTEGRITY_VALID_FLAGS (IO_INTEGRITY_CHK_GUARD | \ IO_INTEGRITY_CHK_REFTAG | \ IO_INTEGRITY_CHK_APPTAG)
#define SEEK_SET 0 /* seek relative to beginning of file */#define SEEK_CUR 1 /* seek relative to current file position */#define SEEK_END 2 /* seek relative to end of file */#define SEEK_DATA 3 /* seek to the next data */#define SEEK_HOLE 4 /* seek to the next hole */#define SEEK_MAX SEEK_HOLE
#define RENAME_NOREPLACE (1 << 0) /* Don't overwrite target */#define RENAME_EXCHANGE (1 << 1) /* Exchange source and dest */#define RENAME_WHITEOUT (1 << 2) /* Whiteout source */
/* * The root inode of procfs is guaranteed to always have the same inode number. * For programs that make heavy use of procfs, verifying that the root is a * real procfs root and using openat2(RESOLVE_{NO_{XDEV,MAGICLINKS},BENEATH}) * will allow you to make sure you are never tricked into operating on the * wrong procfs file. */enum procfs_ino { PROCFS_ROOT_INO = 1,};
struct file_clone_range { __s64 src_fd; __u64 src_offset; __u64 src_length; __u64 dest_offset;};
struct fstrim_range { __u64 start; __u64 len; __u64 minlen;};
/* * We include a length field because some filesystems (vfat) have an identifier * that we do want to expose as a UUID, but doesn't have the standard length. * * We use a fixed size buffer beacuse this interface will, by fiat, never * support "UUIDs" longer than 16 bytes; we don't want to force all downstream * users to have to deal with that. */struct fsuuid2 { __u8 len; __u8 uuid[16];};
struct fs_sysfs_path { __u8 len; __u8 name[128];};
/* Protection info capability flags */#define LBMD_PI_CAP_INTEGRITY (1 << 0)#define LBMD_PI_CAP_REFTAG (1 << 1)
/* Checksum types for Protection Information */#define LBMD_PI_CSUM_NONE 0#define LBMD_PI_CSUM_IP 1#define LBMD_PI_CSUM_CRC16_T10DIF 2#define LBMD_PI_CSUM_CRC64_NVME 4
/* sizeof first published struct */#define LBMD_SIZE_VER0 16
/* * Logical block metadata capability descriptor * If the device does not support metadata, all the fields will be zero. * Applications must check lbmd_flags to determine whether metadata is * supported or not. */struct logical_block_metadata_cap { /* Bitmask of logical block metadata capability flags */ __u32 lbmd_flags; /* * The amount of data described by each unit of logical block * metadata */ __u16 lbmd_interval; /* * Size in bytes of the logical block metadata associated with each * interval */ __u8 lbmd_size; /* * Size in bytes of the opaque block tag associated with each * interval */ __u8 lbmd_opaque_size; /* * Offset in bytes of the opaque block tag within the logical block * metadata */ __u8 lbmd_opaque_offset; /* Size in bytes of the T10 PI tuple associated with each interval */ __u8 lbmd_pi_size; /* Offset in bytes of T10 PI tuple within the logical block metadata */ __u8 lbmd_pi_offset; /* T10 PI guard tag type */ __u8 lbmd_guard_tag_type; /* Size in bytes of the T10 PI application tag */ __u8 lbmd_app_tag_size; /* Size in bytes of the T10 PI reference tag */ __u8 lbmd_ref_tag_size; /* Size in bytes of the T10 PI storage tag */ __u8 lbmd_storage_tag_size; __u8 pad;};
/* extent-same (dedupe) ioctls; these MUST match the btrfs ioctl definitions */#define FILE_DEDUPE_RANGE_SAME 0#define FILE_DEDUPE_RANGE_DIFFERS 1
/* from struct btrfs_ioctl_file_extent_same_info */struct file_dedupe_range_info { __s64 dest_fd; /* in - destination file */ __u64 dest_offset; /* in - start of extent in destination */ __u64 bytes_deduped; /* out - total # of bytes we were able * to dedupe from this file. */ /* status of this dedupe operation: * < 0 for error * == FILE_DEDUPE_RANGE_SAME if dedupe succeeds * == FILE_DEDUPE_RANGE_DIFFERS if data differs */ __s32 status; /* out - see above description */ __u32 reserved; /* must be zero */};
/* from struct btrfs_ioctl_file_extent_same_args */struct file_dedupe_range { __u64 src_offset; /* in - start of extent in source */ __u64 src_length; /* in - length of extent */ __u16 dest_count; /* in - total elements in info array */ __u16 reserved1; /* must be zero */ __u32 reserved2; /* must be zero */ struct file_dedupe_range_info info[];};
/* And dynamically-tunable limits and defaults: */struct files_stat_struct { unsigned long nr_files; /* read only */ unsigned long nr_free_files; /* read only */ unsigned long max_files; /* tunable */};
struct inodes_stat_t { long nr_inodes; long nr_unused; long dummy[5]; /* padding for sysctl ABI compatibility */};
#define NR_FILE 8192 /* this can well be larger on a larger system */
/* * Structure for FS_IOC_FSGETXATTR[A] and FS_IOC_FSSETXATTR. */struct fsxattr { __u32 fsx_xflags; /* xflags field value (get/set) */ __u32 fsx_extsize; /* extsize field value (get/set)*/ __u32 fsx_nextents; /* nextents field value (get) */ __u32 fsx_projid; /* project identifier (get/set) */ __u32 fsx_cowextsize; /* CoW extsize field value (get/set)*/ unsigned char fsx_pad[8];};
/* * Variable size structure for file_[sg]et_attr(). * * Note. This is alternative to the structure 'struct file_kattr'/'struct fsxattr'. * As this structure is passed to/from userspace with its size, this can * be versioned based on the size. */struct file_attr { __u64 fa_xflags; /* xflags field value (get/set) */ __u32 fa_extsize; /* extsize field value (get/set)*/ __u32 fa_nextents; /* nextents field value (get) */ __u32 fa_projid; /* project identifier (get/set) */ __u32 fa_cowextsize; /* CoW extsize field value (get/set) */};
#define FILE_ATTR_SIZE_VER0 24#define FILE_ATTR_SIZE_LATEST FILE_ATTR_SIZE_VER0
/* * Flags for the fsx_xflags field */#define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */#define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */#define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */#define FS_XFLAG_APPEND 0x00000010 /* all writes append */#define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */#define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */#define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */#define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */#define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */#define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */#define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */#define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */#define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */#define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */#define FS_XFLAG_DAX 0x00008000 /* use DAX for IO */#define FS_XFLAG_COWEXTSIZE 0x00010000 /* CoW extent size allocator hint */#define FS_XFLAG_VERITY 0x00020000 /* fs-verity enabled *//* * Case handling flags (read-only, cannot be set via ioctl). * Default (neither set) indicates POSIX semantics: case-sensitive * lookups and case-preserving storage. */#define FS_XFLAG_CASEFOLD 0x00040000 /* case-insensitive lookups */#define FS_XFLAG_CASENONPRESERVING 0x00080000 /* case not preserved */#define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */
/* the read-only stuff doesn't really belong here, but any other place is probably as bad and I don't want to create yet another include file. */
#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */#define BLKRRPART _IO(0x12,95) /* re-read partition table */#define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */#define BLKRASET _IO(0x12,98) /* set read ahead for block device */#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */#define BLKSSZGET _IO(0x12,104)/* get block device sector size */#if 0#define BLKPG _IO(0x12,105)/* See blkpg.h */
/* Some people are morons. Do not use sizeof! */
#define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */#define BLKELVSET _IOW(0x12,107,size_t)/* elevator set *//* This was here just to show that the number is taken - probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */#endif/* A jump here: 108-111 have been used for various private purposes. */#define BLKBSZGET _IOR(0x12,112,size_t)#define BLKBSZSET _IOW(0x12,113,size_t)#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)#define BLKTRACESTART _IO(0x12,116)#define BLKTRACESTOP _IO(0x12,117)#define BLKTRACETEARDOWN _IO(0x12,118)#define BLKDISCARD _IO(0x12,119)#define BLKIOMIN _IO(0x12,120)#define BLKIOOPT _IO(0x12,121)#define BLKALIGNOFF _IO(0x12,122)#define BLKPBSZGET _IO(0x12,123)#define BLKDISCARDZEROES _IO(0x12,124)#define BLKSECDISCARD _IO(0x12,125)#define BLKROTATIONAL _IO(0x12,126)#define BLKZEROOUT _IO(0x12,127)#define BLKGETDISKSEQ _IOR(0x12,128,__u64)/* 130-136 and 142 are used by zoned block device ioctls (uapi/linux/blkzoned.h) *//* 137-141 are used by blk-crypto ioctls (uapi/linux/blk-crypto.h) */#define BLKTRACESETUP2 _IOWR(0x12, 142, struct blk_user_trace_setup2)
#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */#define FIBMAP _IO(0x00,1) /* bmap access */#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */#define FIFREEZE _IOWR('X', 119, int) /* Freeze */#define FITHAW _IOWR('X', 120, int) /* Thaw */#define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */#define FICLONE _IOW(0x94, 9, int)#define FICLONERANGE _IOW(0x94, 13, struct file_clone_range)#define FIDEDUPERANGE _IOWR(0x94, 54, struct file_dedupe_range)
#define FSLABEL_MAX 256 /* Max chars for the interface; each fs may differ */
#define FS_IOC_GETFLAGS _IOR('f', 1, long)#define FS_IOC_SETFLAGS _IOW('f', 2, long)#define FS_IOC_GETVERSION _IOR('v', 1, long)#define FS_IOC_SETVERSION _IOW('v', 2, long)#define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)#define FS_IOC32_GETFLAGS _IOR('f', 1, int)#define FS_IOC32_SETFLAGS _IOW('f', 2, int)#define FS_IOC32_GETVERSION _IOR('v', 1, int)#define FS_IOC32_SETVERSION _IOW('v', 2, int)#define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr)#define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr)#define FS_IOC_GETFSLABEL _IOR(0x94, 49, char[FSLABEL_MAX])#define FS_IOC_SETFSLABEL _IOW(0x94, 50, char[FSLABEL_MAX])/* Returns the external filesystem UUID, the same one blkid returns */#define FS_IOC_GETFSUUID _IOR(0x15, 0, struct fsuuid2)/* * Returns the path component under /sys/fs/ that refers to this filesystem; * also /sys/kernel/debug/ for filesystems with debugfs exports */#define FS_IOC_GETFSSYSFSPATH _IOR(0x15, 1, struct fs_sysfs_path)/* Get logical block metadata capability details */#define FS_IOC_GETLBMD_CAP _IOWR(0x15, 2, struct logical_block_metadata_cap)
/* * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) * * Note: for historical reasons, these flags were originally used and * defined for use by ext2/ext3, and then other file systems started * using these flags so they wouldn't need to write their own version * of chattr/lsattr (which was shipped as part of e2fsprogs). You * should think twice before trying to use these flags in new * contexts, or trying to assign these flags, since they are used both * as the UAPI and the on-disk encoding for ext2/3/4. Also, we are * almost out of 32-bit flags. :-) * * We have recently hoisted FS_IOC_FSGETXATTR / FS_IOC_FSSETXATTR from * XFS to the generic FS level interface. This uses a structure that * has padding and hence has more room to grow, so it may be more * appropriate for many new use cases. * * Please do not change these flags or interfaces before checking with * linux-fsdevel@vger.kernel.org and linux-api@vger.kernel.org. */#define FS_SECRM_FL 0x00000001 /* Secure deletion */#define FS_UNRM_FL 0x00000002 /* Undelete */#define FS_COMPR_FL 0x00000004 /* Compress file */#define FS_SYNC_FL 0x00000008 /* Synchronous updates */#define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */#define FS_APPEND_FL 0x00000020 /* writes to file may only append */#define FS_NODUMP_FL 0x00000040 /* do not dump file */#define FS_NOATIME_FL 0x00000080 /* do not update atime *//* Reserved for compression usage... */#define FS_DIRTY_FL 0x00000100#define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */#define FS_NOCOMP_FL 0x00000400 /* Don't compress *//* End compression flags --- maybe not all used */#define FS_ENCRYPT_FL 0x00000800 /* Encrypted file */#define FS_BTREE_FL 0x00001000 /* btree format dir */#define FS_INDEX_FL 0x00001000 /* hash-indexed directory */#define FS_IMAGIC_FL 0x00002000 /* AFS directory */#define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */#define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */#define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */#define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/#define FS_HUGE_FILE_FL 0x00040000 /* Reserved for ext4 */#define FS_EXTENT_FL 0x00080000 /* Extents */#define FS_VERITY_FL 0x00100000 /* Verity protected inode */#define FS_EA_INODE_FL 0x00200000 /* Inode used for large EA */#define FS_EOFBLOCKS_FL 0x00400000 /* Reserved for ext4 */#define FS_NOCOW_FL 0x00800000 /* Do not cow file */#define FS_DAX_FL 0x02000000 /* Inode is DAX */#define FS_INLINE_DATA_FL 0x10000000 /* Reserved for ext4 */#define FS_PROJINHERIT_FL 0x20000000 /* Create with parents projid *//* * FS_CASEFOLD_FL indicates case-insensitive name lookup. The * bit is most often reported on directories, where it controls * lookups of entries within. Filesystems that derive * case-insensitivity from mount or volume state may also report * it on non-directory inodes; userspace must not assume the bit * is directory-only. FS_XFLAG_CASEFOLD reports the same * information read-only via FS_IOC_FSGETXATTR. */#define FS_CASEFOLD_FL 0x40000000#define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
#define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */#define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
#define SYNC_FILE_RANGE_WAIT_BEFORE 1#define SYNC_FILE_RANGE_WRITE 2#define SYNC_FILE_RANGE_WAIT_AFTER 4#define SYNC_FILE_RANGE_WRITE_AND_WAIT (SYNC_FILE_RANGE_WRITE | \ SYNC_FILE_RANGE_WAIT_BEFORE | \ SYNC_FILE_RANGE_WAIT_AFTER)
/* * Flags for preadv2/pwritev2: */
typedef int __bitwise __kernel_rwf_t;
/* high priority request, poll if possible */#define RWF_HIPRI ((__force __kernel_rwf_t)0x00000001)
/* per-IO O_DSYNC */#define RWF_DSYNC ((__force __kernel_rwf_t)0x00000002)
/* per-IO O_SYNC */#define RWF_SYNC ((__force __kernel_rwf_t)0x00000004)
/* per-IO, return -EAGAIN if operation would block */#define RWF_NOWAIT ((__force __kernel_rwf_t)0x00000008)
/* per-IO O_APPEND */#define RWF_APPEND ((__force __kernel_rwf_t)0x00000010)
/* per-IO negation of O_APPEND */#define RWF_NOAPPEND ((__force __kernel_rwf_t)0x00000020)
/* Atomic Write */#define RWF_ATOMIC ((__force __kernel_rwf_t)0x00000040)
/* buffered IO that drops the cache after reading or writing data */#define RWF_DONTCACHE ((__force __kernel_rwf_t)0x00000080)
/* prevent pipe and socket writes from raising SIGPIPE */#define RWF_NOSIGNAL ((__force __kernel_rwf_t)0x00000100)
/* mask of flags supported by the kernel */#define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT |\ RWF_APPEND | RWF_NOAPPEND | RWF_ATOMIC |\ RWF_DONTCACHE | RWF_NOSIGNAL)
#define PROCFS_IOCTL_MAGIC 'f'
/* Pagemap ioctl */#define PAGEMAP_SCAN _IOWR(PROCFS_IOCTL_MAGIC, 16, struct pm_scan_arg)
/* Bitmasks provided in pm_scan_args masks and reported in page_region.categories. */#define PAGE_IS_WPALLOWED (1 << 0)#define PAGE_IS_WRITTEN (1 << 1)#define PAGE_IS_FILE (1 << 2)#define PAGE_IS_PRESENT (1 << 3)#define PAGE_IS_SWAPPED (1 << 4)#define PAGE_IS_PFNZERO (1 << 5)#define PAGE_IS_HUGE (1 << 6)#define PAGE_IS_SOFT_DIRTY (1 << 7)#define PAGE_IS_GUARD (1 << 8)
/* * struct page_region - Page region with flags * @start: Start of the region * @end: End of the region (exclusive) * @categories: PAGE_IS_* category bitmask for the region */struct page_region { __u64 start; __u64 end; __u64 categories;};
/* Flags for PAGEMAP_SCAN ioctl */#define PM_SCAN_WP_MATCHING (1 << 0) /* Write protect the pages matched. */#define PM_SCAN_CHECK_WPASYNC (1 << 1) /* Abort the scan when a non-WP-enabled page is found. */
/* * struct pm_scan_arg - Pagemap ioctl argument * @size: Size of the structure * @flags: Flags for the IOCTL * @start: Starting address of the region * @end: Ending address of the region * @walk_end Address where the scan stopped (written by kernel). * walk_end == end (address tags cleared) informs that the scan completed on entire range. * @vec: Address of page_region struct array for output * @vec_len: Length of the page_region struct array * @max_pages: Optional limit for number of returned pages (0 = disabled) * @category_inverted: PAGE_IS_* categories which values match if 0 instead of 1 * @category_mask: Skip pages for which any category doesn't match * @category_anyof_mask: Skip pages for which no category matches * @return_mask: PAGE_IS_* categories that are to be reported in `page_region`s returned */struct pm_scan_arg { __u64 size; __u64 flags; __u64 start; __u64 end; __u64 walk_end; __u64 vec; __u64 vec_len; __u64 max_pages; __u64 category_inverted; __u64 category_mask; __u64 category_anyof_mask; __u64 return_mask;};
/* /proc/<pid>/maps ioctl */#define PROCMAP_QUERY _IOWR(PROCFS_IOCTL_MAGIC, 17, struct procmap_query)
enum procmap_query_flags { /* * VMA permission flags. * * Can be used as part of procmap_query.query_flags field to look up * only VMAs satisfying specified subset of permissions. E.g., specifying * PROCMAP_QUERY_VMA_READABLE only will return both readable and read/write VMAs, * while having PROCMAP_QUERY_VMA_READABLE | PROCMAP_QUERY_VMA_WRITABLE will only * return read/write VMAs, though both executable/non-executable and * private/shared will be ignored. * * PROCMAP_QUERY_VMA_* flags are also returned in procmap_query.vma_flags * field to specify actual VMA permissions. */ PROCMAP_QUERY_VMA_READABLE = 0x01, PROCMAP_QUERY_VMA_WRITABLE = 0x02, PROCMAP_QUERY_VMA_EXECUTABLE = 0x04, PROCMAP_QUERY_VMA_SHARED = 0x08, /* * Query modifier flags. * * By default VMA that covers provided address is returned, or -ENOENT * is returned. With PROCMAP_QUERY_COVERING_OR_NEXT_VMA flag set, closest * VMA with vma_start > addr will be returned if no covering VMA is * found. * * PROCMAP_QUERY_FILE_BACKED_VMA instructs query to consider only VMAs that * have file backing. Can be combined with PROCMAP_QUERY_COVERING_OR_NEXT_VMA * to iterate all VMAs with file backing. */ PROCMAP_QUERY_COVERING_OR_NEXT_VMA = 0x10, PROCMAP_QUERY_FILE_BACKED_VMA = 0x20,};
/* * Input/output argument structured passed into ioctl() call. It can be used * to query a set of VMAs (Virtual Memory Areas) of a process. * * Each field can be one of three kinds, marked in a short comment to the * right of the field: * - "in", input argument, user has to provide this value, kernel doesn't modify it; * - "out", output argument, kernel sets this field with VMA data; * - "in/out", input and output argument; user provides initial value (used * to specify maximum allowable buffer size), and kernel sets it to actual * amount of data written (or zero, if there is no data). * * If matching VMA is found (according to criterias specified by * query_addr/query_flags, all the out fields are filled out, and ioctl() * returns 0. If there is no matching VMA, -ENOENT will be returned. * In case of any other error, negative error code other than -ENOENT is * returned. * * Most of the data is similar to the one returned as text in /proc/<pid>/maps * file, but procmap_query provides more querying flexibility. There are no * consistency guarantees between subsequent ioctl() calls, but data returned * for matched VMA is self-consistent. */struct procmap_query { /* Query struct size, for backwards/forward compatibility */ __u64 size; /* * Query flags, a combination of enum procmap_query_flags values. * Defines query filtering and behavior, see enum procmap_query_flags. * * Input argument, provided by user. Kernel doesn't modify it. */ __u64 query_flags; /* in */ /* * Query address. By default, VMA that covers this address will * be looked up. PROCMAP_QUERY_* flags above modify this default * behavior further. * * Input argument, provided by user. Kernel doesn't modify it. */ __u64 query_addr; /* in */ /* VMA starting (inclusive) and ending (exclusive) address, if VMA is found. */ __u64 vma_start; /* out */ __u64 vma_end; /* out */ /* VMA permissions flags. A combination of PROCMAP_QUERY_VMA_* flags. */ __u64 vma_flags; /* out */ /* VMA backing page size granularity. */ __u64 vma_page_size; /* out */ /* * VMA file offset. If VMA has file backing, this specifies offset * within the file that VMA's start address corresponds to. * Is set to zero if VMA has no backing file. */ __u64 vma_offset; /* out */ /* Backing file's inode number, or zero, if VMA has no backing file. */ __u64 inode; /* out */ /* Backing file's device major/minor number, or zero, if VMA has no backing file. */ __u32 dev_major; /* out */ __u32 dev_minor; /* out */ /* * If set to non-zero value, signals the request to return VMA name * (i.e., VMA's backing file's absolute path, with " (deleted)" suffix * appended, if file was unlinked from FS) for matched VMA. VMA name * can also be some special name (e.g., "[heap]", "[stack]") or could * be even user-supplied with prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME). * * Kernel will set this field to zero, if VMA has no associated name. * Otherwise kernel will return actual amount of bytes filled in * user-supplied buffer (see vma_name_addr field below), including the * terminating zero. * * If VMA name is longer that user-supplied maximum buffer size, * -E2BIG error is returned. * * If this field is set to non-zero value, vma_name_addr should point * to valid user space memory buffer of at least vma_name_size bytes. * If set to zero, vma_name_addr should be set to zero as well */ __u32 vma_name_size; /* in/out */ /* * If set to non-zero value, signals the request to extract and return * VMA's backing file's build ID, if the backing file is an ELF file * and it contains embedded build ID. * * Kernel will set this field to zero, if VMA has no backing file, * backing file is not an ELF file, or ELF file has no build ID * embedded. * * Build ID is a binary value (not a string). Kernel will set * build_id_size field to exact number of bytes used for build ID. * If build ID is requested and present, but needs more bytes than * user-supplied maximum buffer size (see build_id_addr field below), * -E2BIG error will be returned. * * If this field is set to non-zero value, build_id_addr should point * to valid user space memory buffer of at least build_id_size bytes. * If set to zero, build_id_addr should be set to zero as well */ __u32 build_id_size; /* in/out */ /* * User-supplied address of a buffer of at least vma_name_size bytes * for kernel to fill with matched VMA's name (see vma_name_size field * description above for details). * * Should be set to zero if VMA name should not be returned. */ __u64 vma_name_addr; /* in */ /* * User-supplied address of a buffer of at least build_id_size bytes * for kernel to fill with matched VMA's ELF build ID, if available * (see build_id_size field description above for details). * * Should be set to zero if build ID should not be returned. */ __u64 build_id_addr; /* in */};
/* * Shutdown the filesystem. */#define FS_IOC_SHUTDOWN _IOR('X', 125, __u32)
/* * Flags for FS_IOC_SHUTDOWN */#define FS_SHUTDOWN_FLAGS_DEFAULT 0x0#define FS_SHUTDOWN_FLAGS_LOGFLUSH 0x1 /* flush log but not data*/#define FS_SHUTDOWN_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */
#endif /* _UAPI_LINUX_FS_H */