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 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
 #ifndef _UAPI_LINUX_FS_H
 #define _UAPI_LINUX_FS_H
 
 /*
  * 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)
 
 #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 */
 
 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;
 };
 
 /* 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];
 };
 
 /*
  * 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_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)
 /*
  * A jump here: 130-136 are reserved for zoned block devices
  * (see uapi/linux/blkzoned.h)
  */
 
 #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])
 
 /*
  * 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 */
 #define FS_CASEFOLD_FL          0x40000000 /* Folder is case insensitive */
 #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)
 
 /* mask of flags supported by the kernel */
 #define RWF_SUPPORTED   (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT |\
              RWF_APPEND)
 
 #endif /* _UAPI_LINUX_FS_H */

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