xref: /openbmc/linux/fs/xfs/xfs_fsmap.h (revision 160b8e75)
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__ */
54