303 lines
12 KiB
C
303 lines
12 KiB
C
/* 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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#include <linux/fscrypt.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: 130-131 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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* 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_VERITY_FL 0x00100000 /* Verity protected inode */
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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_CASEFOLD_FL 0x40000000 /* Folder is case insensitive */
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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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#define SYNC_FILE_RANGE_WRITE_AND_WAIT (SYNC_FILE_RANGE_WRITE | \
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SYNC_FILE_RANGE_WAIT_BEFORE | \
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SYNC_FILE_RANGE_WAIT_AFTER)
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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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