LXR linux/fs/ext4/fsmap.h

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2017 Oracle.  All Rights Reserved.
   4 *
   5 * Author: Darrick J. Wong <darrick.wong@oracle.com>
   6 */
   7#ifndef __EXT4_FSMAP_H__
   8#define __EXT4_FSMAP_H__
   9
  10struct fsmap;
  11
  12/* internal fsmap representation */
  13struct ext4_fsmap {
  14        struct list_head        fmr_list;
  15        dev_t           fmr_device;     /* device id */
  16        uint32_t        fmr_flags;      /* mapping flags */
  17        uint64_t        fmr_physical;   /* device offset of segment */
  18        uint64_t        fmr_owner;      /* owner id */
  19        uint64_t        fmr_length;     /* length of segment, blocks */
  20};
  21
  22struct ext4_fsmap_head {
  23        uint32_t        fmh_iflags;     /* control flags */
  24        uint32_t        fmh_oflags;     /* output flags */
  25        unsigned int    fmh_count;      /* # of entries in array incl. input */
  26        unsigned int    fmh_entries;    /* # of entries filled in (output). */
  27
  28        struct ext4_fsmap fmh_keys[2];  /* low and high keys */
  29};
  30
  31void ext4_fsmap_from_internal(struct super_block *sb, struct fsmap *dest,
  32                struct ext4_fsmap *src);
  33void ext4_fsmap_to_internal(struct super_block *sb, struct ext4_fsmap *dest,
  34                struct fsmap *src);
  35
  36/* fsmap to userspace formatter - copy to user & advance pointer */
  37typedef int (*ext4_fsmap_format_t)(struct ext4_fsmap *, void *);
  38
  39int ext4_getfsmap(struct super_block *sb, struct ext4_fsmap_head *head,
  40                ext4_fsmap_format_t formatter, void *arg);
  41
  42#define EXT4_QUERY_RANGE_ABORT          1
  43#define EXT4_QUERY_RANGE_CONTINUE       0
  44
  45/*      fmr_owner special values for FS_IOC_GETFSMAP; some share w/ XFS */
  46#define EXT4_FMR_OWN_FREE       FMR_OWN_FREE      /* free space */
  47#define EXT4_FMR_OWN_UNKNOWN    FMR_OWN_UNKNOWN   /* unknown owner */
  48#define EXT4_FMR_OWN_FS         FMR_OWNER('X', 1) /* static fs metadata */
  49#define EXT4_FMR_OWN_LOG        FMR_OWNER('X', 2) /* journalling log */
  50#define EXT4_FMR_OWN_INODES     FMR_OWNER('X', 5) /* inodes */
  51#define EXT4_FMR_OWN_GDT        FMR_OWNER('f', 1) /* group descriptors */
  52#define EXT4_FMR_OWN_RESV_GDT   FMR_OWNER('f', 2) /* reserved gdt blocks */
  53#define EXT4_FMR_OWN_BLKBM      FMR_OWNER('f', 3) /* block bitmap */
  54#define EXT4_FMR_OWN_INOBM      FMR_OWNER('f', 4) /* inode bitmap */
  55
  56#endif /* __EXT4_FSMAP_H__ */
  57