LXR linux/fs/ext4/fsmap.h

   1/*
   2 * Copyright (C) 2017 Oracle.  All Rights Reserved.
   3 *
   4 * Author: Darrick J. Wong <darrick.wong@oracle.com>
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version 2
   9 * of the License, or (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it would be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write the Free Software Foundation,
  18 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
  19 */
  20#ifndef __EXT4_FSMAP_H__
  21#define __EXT4_FSMAP_H__
  22
  23struct fsmap;
  24
  25/* internal fsmap representation */
  26struct ext4_fsmap {
  27        struct list_head        fmr_list;
  28        dev_t           fmr_device;     /* device id */
  29        uint32_t        fmr_flags;      /* mapping flags */
  30        uint64_t        fmr_physical;   /* device offset of segment */
  31        uint64_t        fmr_owner;      /* owner id */
  32        uint64_t        fmr_length;     /* length of segment, blocks */
  33};
  34
  35struct ext4_fsmap_head {
  36        uint32_t        fmh_iflags;     /* control flags */
  37        uint32_t        fmh_oflags;     /* output flags */
  38        unsigned int    fmh_count;      /* # of entries in array incl. input */
  39        unsigned int    fmh_entries;    /* # of entries filled in (output). */
  40
  41        struct ext4_fsmap fmh_keys[2];  /* low and high keys */
  42};
  43
  44void ext4_fsmap_from_internal(struct super_block *sb, struct fsmap *dest,
  45                struct ext4_fsmap *src);
  46void ext4_fsmap_to_internal(struct super_block *sb, struct ext4_fsmap *dest,
  47                struct fsmap *src);
  48
  49/* fsmap to userspace formatter - copy to user & advance pointer */
  50typedef int (*ext4_fsmap_format_t)(struct ext4_fsmap *, void *);
  51
  52int ext4_getfsmap(struct super_block *sb, struct ext4_fsmap_head *head,
  53                ext4_fsmap_format_t formatter, void *arg);
  54
  55#define EXT4_QUERY_RANGE_ABORT          1
  56#define EXT4_QUERY_RANGE_CONTINUE       0
  57
  58/*      fmr_owner special values for FS_IOC_GETFSMAP; some share w/ XFS */
  59#define EXT4_FMR_OWN_FREE       FMR_OWN_FREE      /* free space */
  60#define EXT4_FMR_OWN_UNKNOWN    FMR_OWN_UNKNOWN   /* unknown owner */
  61#define EXT4_FMR_OWN_FS         FMR_OWNER('X', 1) /* static fs metadata */
  62#define EXT4_FMR_OWN_LOG        FMR_OWNER('X', 2) /* journalling log */
  63#define EXT4_FMR_OWN_INODES     FMR_OWNER('X', 5) /* inodes */
  64#define EXT4_FMR_OWN_GDT        FMR_OWNER('f', 1) /* group descriptors */
  65#define EXT4_FMR_OWN_RESV_GDT   FMR_OWNER('f', 2) /* reserved gdt blocks */
  66#define EXT4_FMR_OWN_BLKBM      FMR_OWNER('f', 3) /* inode bitmap */
  67#define EXT4_FMR_OWN_INOBM      FMR_OWNER('f', 4) /* block bitmap */
  68
  69#endif /* __EXT4_FSMAP_H__ */
  70