/* 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>

/*
 * 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[0];
};

/* 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 */


/*
 * These are the fs-independent mount-flags: up to 32 flags are supported
 */
#define MS_RDONLY        1      /* Mount read-only */
#define MS_NOSUID        2      /* Ignore suid and sgid bits */
#define MS_NODEV         4      /* Disallow access to device special files */
#define MS_NOEXEC        8      /* Disallow program execution */
#define MS_SYNCHRONOUS  16      /* Writes are synced at once */
#define MS_REMOUNT      32      /* Alter flags of a mounted FS */
#define MS_MANDLOCK     64      /* Allow mandatory locks on an FS */
#define MS_DIRSYNC      128     /* Directory modifications are synchronous */
#define MS_NOATIME      1024    /* Do not update access times. */
#define MS_NODIRATIME   2048    /* Do not update directory access times */
#define MS_BIND         4096
#define MS_MOVE         8192
#define MS_REC          16384
#define MS_VERBOSE      32768   /* War is peace. Verbosity is silence.
                                   MS_VERBOSE is deprecated. */
#define MS_SILENT       32768
#define MS_POSIXACL     (1<<16) /* VFS does not apply the umask */
#define MS_UNBINDABLE   (1<<17) /* change to unbindable */
#define MS_PRIVATE      (1<<18) /* change to private */
#define MS_SLAVE        (1<<19) /* change to slave */
#define MS_SHARED       (1<<20) /* change to shared */
#define MS_RELATIME     (1<<21) /* Update atime relative to mtime/ctime. */
#define MS_KERNMOUNT    (1<<22) /* this is a kern_mount call */
#define MS_I_VERSION    (1<<23) /* Update inode I_version field */
#define MS_STRICTATIME  (1<<24) /* Always perform atime updates */
#define MS_LAZYTIME     (1<<25) /* Update the on-disk [acm]times lazily */

/* These sb flags are internal to the kernel */
#define MS_SUBMOUNT     (1<<26)
#define MS_NOREMOTELOCK (1<<27)
#define MS_NOSEC        (1<<28)
#define MS_BORN         (1<<29)
#define MS_ACTIVE       (1<<30)
#define MS_NOUSER       (1<<31)

/*
 * Superblock flags that can be altered by MS_REMOUNT
 */
#define MS_RMT_MASK     (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|\
                         MS_LAZYTIME)

/*
 * Old magic mount flag and mask
 */
#define MS_MGC_VAL 0xC0ED0000
#define MS_MGC_MSK 0xffff0000

/*
 * 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)
/*
 * A jump here: 130-131 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 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)

/*
 * File system encryption support
 */
/* Policy provided via an ioctl on the topmost directory */
#define FS_KEY_DESCRIPTOR_SIZE  8

#define FS_POLICY_FLAGS_PAD_4           0x00
#define FS_POLICY_FLAGS_PAD_8           0x01
#define FS_POLICY_FLAGS_PAD_16          0x02
#define FS_POLICY_FLAGS_PAD_32          0x03
#define FS_POLICY_FLAGS_PAD_MASK        0x03
#define FS_POLICY_FLAGS_VALID           0x03

/* Encryption algorithms */
#define FS_ENCRYPTION_MODE_INVALID              0
#define FS_ENCRYPTION_MODE_AES_256_XTS          1
#define FS_ENCRYPTION_MODE_AES_256_GCM          2
#define FS_ENCRYPTION_MODE_AES_256_CBC          3
#define FS_ENCRYPTION_MODE_AES_256_CTS          4
#define FS_ENCRYPTION_MODE_AES_128_CBC          5
#define FS_ENCRYPTION_MODE_AES_128_CTS          6

struct fscrypt_policy {
        __u8 version;
        __u8 contents_encryption_mode;
        __u8 filenames_encryption_mode;
        __u8 flags;
        __u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE];
};

#define FS_IOC_SET_ENCRYPTION_POLICY    _IOR('f', 19, struct fscrypt_policy)
#define FS_IOC_GET_ENCRYPTION_PWSALT    _IOW('f', 20, __u8[16])
#define FS_IOC_GET_ENCRYPTION_POLICY    _IOW('f', 21, struct fscrypt_policy)

/* Parameters for passing an encryption key into the kernel keyring */
#define FS_KEY_DESC_PREFIX              "fscrypt:"
#define FS_KEY_DESC_PREFIX_SIZE         8

/* Structure that userspace passes to the kernel keyring */
#define FS_MAX_KEY_SIZE                 64

struct fscrypt_key {
        __u32 mode;
        __u8 raw[FS_MAX_KEY_SIZE];
        __u32 size;
};

/*
 * 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_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_INLINE_DATA_FL               0x10000000 /* Reserved for ext4 */
#define FS_PROJINHERIT_FL               0x20000000 /* Create with parents projid */
#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

/*
 * 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 */