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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 | ||
23 | struct fsmap; | |
24 | ||
25 | /* internal fsmap representation */ | |
26 | struct 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 | ||
35 | struct 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 | ||
44 | void ext4_fsmap_from_internal(struct super_block *sb, struct fsmap *dest, | |
45 | struct ext4_fsmap *src); | |
46 | void 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 */ | |
50 | typedef int (*ext4_fsmap_format_t)(struct ext4_fsmap *, void *); | |
51 | ||
52 | int 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__ */ |