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
10 struct fsmap;
11
12 /* internal fsmap representation */
13 struct 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
22 struct 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
31 void ext4_fsmap_from_internal(struct super_block *sb, struct fsmap *dest,
32 struct ext4_fsmap *src);
33 void 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 */
37 typedef int (*ext4_fsmap_format_t)(struct ext4_fsmap *, void *);
38
39 int 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
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