// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2017 Oracle.  All Rights Reserved.
 *
 * Author: Darrick J. Wong <darrick.wong@oracle.com>
 */
#ifndef __EXT4_FSMAP_H__
#define __EXT4_FSMAP_H__

struct fsmap;

/* internal fsmap representation */
struct ext4_fsmap {
        struct list_head        fmr_list;
        dev_t           fmr_device;     /* device id */
        uint32_t        fmr_flags;      /* mapping flags */
        uint64_t        fmr_physical;   /* device offset of segment */
        uint64_t        fmr_owner;      /* owner id */
        uint64_t        fmr_length;     /* length of segment, blocks */
};

struct ext4_fsmap_head {
        uint32_t        fmh_iflags;     /* control flags */
        uint32_t        fmh_oflags;     /* output flags */
        unsigned int    fmh_count;      /* # of entries in array incl. input */
        unsigned int    fmh_entries;    /* # of entries filled in (output). */

        struct ext4_fsmap fmh_keys[2];  /* low and high keys */
};

void ext4_fsmap_from_internal(struct super_block *sb, struct fsmap *dest,
                struct ext4_fsmap *src);
void ext4_fsmap_to_internal(struct super_block *sb, struct ext4_fsmap *dest,
                struct fsmap *src);

/* fsmap to userspace formatter - copy to user & advance pointer */
typedef int (*ext4_fsmap_format_t)(struct ext4_fsmap *, void *);

int ext4_getfsmap(struct super_block *sb, struct ext4_fsmap_head *head,
                ext4_fsmap_format_t formatter, void *arg);

#define EXT4_QUERY_RANGE_ABORT          1
#define EXT4_QUERY_RANGE_CONTINUE       0

/*      fmr_owner special values for FS_IOC_GETFSMAP; some share w/ XFS */
#define EXT4_FMR_OWN_FREE       FMR_OWN_FREE      /* free space */
#define EXT4_FMR_OWN_UNKNOWN    FMR_OWN_UNKNOWN   /* unknown owner */
#define EXT4_FMR_OWN_FS         FMR_OWNER('X', 1) /* static fs metadata */
#define EXT4_FMR_OWN_LOG        FMR_OWNER('X', 2) /* journalling log */
#define EXT4_FMR_OWN_INODES     FMR_OWNER('X', 5) /* inodes */
#define EXT4_FMR_OWN_GDT        FMR_OWNER('f', 1) /* group descriptors */
#define EXT4_FMR_OWN_RESV_GDT   FMR_OWNER('f', 2) /* reserved gdt blocks */
#define EXT4_FMR_OWN_BLKBM      FMR_OWNER('f', 3) /* block bitmap */
#define EXT4_FMR_OWN_INOBM      FMR_OWNER('f', 4) /* inode bitmap */

#endif /* __EXT4_FSMAP_H__ */