/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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#ifndef _LINUX_FS_H

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#define _LINUX_FS_H

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/*

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* This file has definitions for some important file table structures

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* and constants and structures used by various generic file system

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* ioctl's. Please do not make any changes in this file before

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* sending patches for review to linux-fsdevel@vger.kernel.org and

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* linux-api@vger.kernel.org.

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*/

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#include <linux/limits.h>

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#include <linux/ioctl.h>

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#include <linux/types.h>

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/* Use of MS_* flags within the kernel is restricted to core mount(2) code. */

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#include <linux/mount.h>

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/*

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* It's silly to have NR_OPEN bigger than NR_FILE, but you can change

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* the file limit at runtime and only root can increase the per-process

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* nr_file rlimit, so it's safe to set up a ridiculously high absolute

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* upper limit on files-per-process.

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*

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* Some programs (notably those using select()) may have to be

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* recompiled to take full advantage of the new limits..

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*/

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/* Fixed constants first: */

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#undef NR_OPEN

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#define INR_OPEN_CUR 1024 /* Initial setting for nfile rlimits */

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#define INR_OPEN_MAX 4096 /* Hard limit for nfile rlimits */

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#define BLOCK_SIZE_BITS 10

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#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)

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#define SEEK_SET 0 /* seek relative to beginning of file */

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#define SEEK_CUR 1 /* seek relative to current file position */

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#define SEEK_END 2 /* seek relative to end of file */

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#define SEEK_DATA 3 /* seek to the next data */

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#define SEEK_HOLE 4 /* seek to the next hole */

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#define SEEK_MAX SEEK_HOLE

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#define RENAME_NOREPLACE (1 << 0) /* Don't overwrite target */

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#define RENAME_EXCHANGE (1 << 1) /* Exchange source and dest */

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#define RENAME_WHITEOUT (1 << 2) /* Whiteout source */

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struct file_clone_range {

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__s64 src_fd;

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__u64 src_offset;

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__u64 src_length;

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__u64 dest_offset;

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};

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struct fstrim_range {

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__u64 start;

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__u64 len;

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__u64 minlen;

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};

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/* extent-same (dedupe) ioctls; these MUST match the btrfs ioctl definitions */

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#define FILE_DEDUPE_RANGE_SAME 0

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#define FILE_DEDUPE_RANGE_DIFFERS 1

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/* from struct btrfs_ioctl_file_extent_same_info */

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struct file_dedupe_range_info {

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__s64 dest_fd; /* in - destination file */

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__u64 dest_offset; /* in - start of extent in destination */

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__u64 bytes_deduped; /* out - total # of bytes we were able

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* to dedupe from this file. */

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/* status of this dedupe operation:

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* < 0 for error

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* == FILE_DEDUPE_RANGE_SAME if dedupe succeeds

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* == FILE_DEDUPE_RANGE_DIFFERS if data differs

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*/

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__s32 status; /* out - see above description */

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__u32 reserved; /* must be zero */

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};

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/* from struct btrfs_ioctl_file_extent_same_args */

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struct file_dedupe_range {

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__u64 src_offset; /* in - start of extent in source */

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__u64 src_length; /* in - length of extent */

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__u16 dest_count; /* in - total elements in info array */

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__u16 reserved1; /* must be zero */

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__u32 reserved2; /* must be zero */

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struct file_dedupe_range_info info[0];

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};

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/* And dynamically-tunable limits and defaults: */

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struct files_stat_struct {

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unsigned long nr_files; /* read only */

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unsigned long nr_free_files; /* read only */

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unsigned long max_files; /* tunable */

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};

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struct inodes_stat_t {

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long nr_inodes;

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long nr_unused;

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long dummy[5]; /* padding for sysctl ABI compatibility */

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};

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#define NR_FILE 8192 /* this can well be larger on a larger system */

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/*

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* Structure for FS_IOC_FSGETXATTR[A] and FS_IOC_FSSETXATTR.

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*/

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struct fsxattr {

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__u32 fsx_xflags; /* xflags field value (get/set) */

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__u32 fsx_extsize; /* extsize field value (get/set)*/

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__u32 fsx_nextents; /* nextents field value (get) */

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__u32 fsx_projid; /* project identifier (get/set) */

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__u32 fsx_cowextsize; /* CoW extsize field value (get/set)*/

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unsigned char fsx_pad[8];

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};

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/*

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* Flags for the fsx_xflags field

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*/

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#define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */

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#define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */

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#define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */

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#define FS_XFLAG_APPEND 0x00000010 /* all writes append */

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#define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */

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#define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */

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#define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */

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#define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */

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#define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */

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#define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */

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#define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */

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#define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */

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#define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */

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#define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */

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#define FS_XFLAG_DAX 0x00008000 /* use DAX for IO */

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#define FS_XFLAG_COWEXTSIZE 0x00010000 /* CoW extent size allocator hint */

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#define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */

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/* the read-only stuff doesn't really belong here, but any other place is

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probably as bad and I don't want to create yet another include file. */

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#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */

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#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */

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#define BLKRRPART _IO(0x12,95) /* re-read partition table */

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#define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */

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#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */

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#define BLKRASET _IO(0x12,98) /* set read ahead for block device */

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#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */

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#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */

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#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */

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#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */

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#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */

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#define BLKSSZGET _IO(0x12,104)/* get block device sector size */

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#if 0

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#define BLKPG _IO(0x12,105)/* See blkpg.h */

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/* Some people are morons. Do not use sizeof! */

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#define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */

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#define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */

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/* This was here just to show that the number is taken -

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probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */

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#endif

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/* A jump here: 108-111 have been used for various private purposes. */

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#define BLKBSZGET _IOR(0x12,112,size_t)

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#define BLKBSZSET _IOW(0x12,113,size_t)

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#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */

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#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)

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#define BLKTRACESTART _IO(0x12,116)

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#define BLKTRACESTOP _IO(0x12,117)

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#define BLKTRACETEARDOWN _IO(0x12,118)

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#define BLKDISCARD _IO(0x12,119)

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#define BLKIOMIN _IO(0x12,120)

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#define BLKIOOPT _IO(0x12,121)

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#define BLKALIGNOFF _IO(0x12,122)

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#define BLKPBSZGET _IO(0x12,123)

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#define BLKDISCARDZEROES _IO(0x12,124)

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#define BLKSECDISCARD _IO(0x12,125)

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#define BLKROTATIONAL _IO(0x12,126)

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#define BLKZEROOUT _IO(0x12,127)

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/*

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* A jump here: 130-136 are reserved for zoned block devices

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* (see uapi/linux/blkzoned.h)

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*/

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#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */

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#define FIBMAP _IO(0x00,1) /* bmap access */

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#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */

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#define FIFREEZE _IOWR('X', 119, int) /* Freeze */

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#define FITHAW _IOWR('X', 120, int) /* Thaw */

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#define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */

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#define FICLONE _IOW(0x94, 9, int)

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#define FICLONERANGE _IOW(0x94, 13, struct file_clone_range)

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#define FIDEDUPERANGE _IOWR(0x94, 54, struct file_dedupe_range)

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#define FSLABEL_MAX 256 /* Max chars for the interface; each fs may differ */

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#define FS_IOC_GETFLAGS _IOR('f', 1, long)

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#define FS_IOC_SETFLAGS _IOW('f', 2, long)

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#define FS_IOC_GETVERSION _IOR('v', 1, long)

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#define FS_IOC_SETVERSION _IOW('v', 2, long)

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#define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)

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#define FS_IOC32_GETFLAGS _IOR('f', 1, int)

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#define FS_IOC32_SETFLAGS _IOW('f', 2, int)

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#define FS_IOC32_GETVERSION _IOR('v', 1, int)

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#define FS_IOC32_SETVERSION _IOW('v', 2, int)

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#define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr)

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#define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr)

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#define FS_IOC_GETFSLABEL _IOR(0x94, 49, char[FSLABEL_MAX])

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#define FS_IOC_SETFSLABEL _IOW(0x94, 50, char[FSLABEL_MAX])

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/*

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* File system encryption support

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*/

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/* Policy provided via an ioctl on the topmost directory */

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#define FS_KEY_DESCRIPTOR_SIZE 8

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#define FS_POLICY_FLAGS_PAD_4 0x00

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#define FS_POLICY_FLAGS_PAD_8 0x01

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#define FS_POLICY_FLAGS_PAD_16 0x02

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#define FS_POLICY_FLAGS_PAD_32 0x03

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#define FS_POLICY_FLAGS_PAD_MASK 0x03

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#define FS_POLICY_FLAGS_VALID 0x03

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/* Encryption algorithms */

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#define FS_ENCRYPTION_MODE_INVALID 0

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#define FS_ENCRYPTION_MODE_AES_256_XTS 1

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#define FS_ENCRYPTION_MODE_AES_256_GCM 2

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#define FS_ENCRYPTION_MODE_AES_256_CBC 3

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#define FS_ENCRYPTION_MODE_AES_256_CTS 4

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#define FS_ENCRYPTION_MODE_AES_128_CBC 5

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#define FS_ENCRYPTION_MODE_AES_128_CTS 6

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#define FS_ENCRYPTION_MODE_SPECK128_256_XTS 7

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#define FS_ENCRYPTION_MODE_SPECK128_256_CTS 8

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struct fscrypt_policy {

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__u8 version;

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__u8 contents_encryption_mode;

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__u8 filenames_encryption_mode;

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__u8 flags;

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__u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE];

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};

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#define FS_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct fscrypt_policy)

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#define FS_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16])

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#define FS_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct fscrypt_policy)

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/* Parameters for passing an encryption key into the kernel keyring */

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#define FS_KEY_DESC_PREFIX "fscrypt:"

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#define FS_KEY_DESC_PREFIX_SIZE 8

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/* Structure that userspace passes to the kernel keyring */

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#define FS_MAX_KEY_SIZE 64

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struct fscrypt_key {

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__u32 mode;

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__u8 raw[FS_MAX_KEY_SIZE];

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__u32 size;

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};

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/*

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* Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)

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*

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* Note: for historical reasons, these flags were originally used and

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* defined for use by ext2/ext3, and then other file systems started

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* using these flags so they wouldn't need to write their own version

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* of chattr/lsattr (which was shipped as part of e2fsprogs). You

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* should think twice before trying to use these flags in new

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* contexts, or trying to assign these flags, since they are used both

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* as the UAPI and the on-disk encoding for ext2/3/4. Also, we are

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* almost out of 32-bit flags. :-)

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*

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* We have recently hoisted FS_IOC_FSGETXATTR / FS_IOC_FSSETXATTR from

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* XFS to the generic FS level interface. This uses a structure that

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* has padding and hence has more room to grow, so it may be more

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* appropriate for many new use cases.

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*

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* Please do not change these flags or interfaces before checking with

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* linux-fsdevel@vger.kernel.org and linux-api@vger.kernel.org.

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*/

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#define FS_SECRM_FL 0x00000001 /* Secure deletion */

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#define FS_UNRM_FL 0x00000002 /* Undelete */

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#define FS_COMPR_FL 0x00000004 /* Compress file */

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#define FS_SYNC_FL 0x00000008 /* Synchronous updates */

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#define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */

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#define FS_APPEND_FL 0x00000020 /* writes to file may only append */

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#define FS_NODUMP_FL 0x00000040 /* do not dump file */

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#define FS_NOATIME_FL 0x00000080 /* do not update atime */

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/* Reserved for compression usage... */

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#define FS_DIRTY_FL 0x00000100

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#define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */

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#define FS_NOCOMP_FL 0x00000400 /* Don't compress */

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/* End compression flags --- maybe not all used */

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#define FS_ENCRYPT_FL 0x00000800 /* Encrypted file */

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#define FS_BTREE_FL 0x00001000 /* btree format dir */

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#define FS_INDEX_FL 0x00001000 /* hash-indexed directory */

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#define FS_IMAGIC_FL 0x00002000 /* AFS directory */

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#define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */

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#define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */

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#define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */

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#define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/

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#define FS_HUGE_FILE_FL 0x00040000 /* Reserved for ext4 */

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#define FS_EXTENT_FL 0x00080000 /* Extents */

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#define FS_EA_INODE_FL 0x00200000 /* Inode used for large EA */

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#define FS_EOFBLOCKS_FL 0x00400000 /* Reserved for ext4 */

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#define FS_NOCOW_FL 0x00800000 /* Do not cow file */

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#define FS_DAX_FL 0x02000000 /* Inode is DAX */

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#define FS_INLINE_DATA_FL 0x10000000 /* Reserved for ext4 */

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#define FS_PROJINHERIT_FL 0x20000000 /* Create with parents projid */

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#define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */

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#define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */

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#define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */

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#define SYNC_FILE_RANGE_WAIT_BEFORE 1

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#define SYNC_FILE_RANGE_WRITE 2

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#define SYNC_FILE_RANGE_WAIT_AFTER 4

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/*

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* Flags for preadv2/pwritev2:

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*/

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typedef int __bitwise __kernel_rwf_t;

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/* high priority request, poll if possible */

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#define RWF_HIPRI ((__kernel_rwf_t)0x00000001)

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/* per-IO O_DSYNC */

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#define RWF_DSYNC ((__kernel_rwf_t)0x00000002)

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/* per-IO O_SYNC */

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#define RWF_SYNC ((__kernel_rwf_t)0x00000004)

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/* per-IO, return -EAGAIN if operation would block */

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#define RWF_NOWAIT ((__kernel_rwf_t)0x00000008)

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/* per-IO O_APPEND */

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#define RWF_APPEND ((__kernel_rwf_t)0x00000010)

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/* mask of flags supported by the kernel */

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#define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT |\

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RWF_APPEND)

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#endif /* _LINUX_FS_H */

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