fs/xfs/xfs_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 __XFS_FSMAP_H__
  21 #define __XFS_FSMAP_H__
  22
  23 struct fsmap;
  24
  25 /* internal fsmap representation */
  26 struct xfs_fsmap {
  27         dev_t           fmr_device;     /* device id */
  28         uint32_t        fmr_flags;      /* mapping flags */
  29         uint64_t        fmr_physical;   /* device offset of segment */
  30         uint64_t        fmr_owner;      /* owner id */
  31         xfs_fileoff_t   fmr_offset;     /* file offset of segment */
  32         xfs_filblks_t   fmr_length;     /* length of segment, blocks */
  33 };
  34
  35 struct xfs_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 xfs_fsmap fmh_keys[2];   /* low and high keys */
  42 };
  43
  44 void xfs_fsmap_from_internal(struct fsmap *dest, struct xfs_fsmap *src);
  45 void xfs_fsmap_to_internal(struct xfs_fsmap *dest, struct fsmap *src);
  46
  47 /* fsmap to userspace formatter - copy to user & advance pointer */
  48 typedef int (*xfs_fsmap_format_t)(struct xfs_fsmap *, void *);
  49
  50 int xfs_getfsmap(struct xfs_mount *mp, struct xfs_fsmap_head *head,
  51                 xfs_fsmap_format_t formatter, void *arg);
  52
  53 #endif /* __XFS_FSMAP_H__ */