| 1 | // SPDX-License-Identifier: GPL-2.0+ |
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| 2 | /* |
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| 3 | * Copyright (C) 2017 Oracle. All Rights Reserved. |
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| 4 | * |
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| 5 | * Author: Darrick J. Wong <darrick.wong@oracle.com> |
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| 6 | */ |
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| 7 | #ifndef __EXT4_FSMAP_H__ |
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| 8 | #define __EXT4_FSMAP_H__ |
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| 9 | |
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| 10 | struct fsmap; |
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| 11 | |
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| 12 | /* internal fsmap representation */ |
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| 13 | struct ext4_fsmap { |
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| 14 | struct list_head fmr_list; |
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| 15 | dev_t fmr_device; /* device id */ |
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| 16 | uint32_t fmr_flags; /* mapping flags */ |
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| 17 | uint64_t fmr_physical; /* device offset of segment */ |
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| 18 | uint64_t fmr_owner; /* owner id */ |
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| 19 | uint64_t fmr_length; /* length of segment, blocks */ |
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| 20 | }; |
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| 21 | |
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| 22 | struct ext4_fsmap_head { |
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| 23 | uint32_t fmh_iflags; /* control flags */ |
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| 24 | uint32_t fmh_oflags; /* output flags */ |
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| 25 | unsigned int fmh_count; /* # of entries in array incl. input */ |
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| 26 | unsigned int fmh_entries; /* # of entries filled in (output). */ |
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| 27 | |
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| 28 | struct ext4_fsmap fmh_keys[2]; /* low and high keys */ |
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| 29 | }; |
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| 30 | |
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| 31 | void ext4_fsmap_from_internal(struct super_block *sb, struct fsmap *dest, |
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| 32 | struct ext4_fsmap *src); |
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| 33 | void ext4_fsmap_to_internal(struct super_block *sb, struct ext4_fsmap *dest, |
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| 34 | struct fsmap *src); |
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| 35 | |
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| 36 | /* fsmap to userspace formatter - copy to user & advance pointer */ |
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| 37 | typedef int (*ext4_fsmap_format_t)(struct ext4_fsmap *, void *); |
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| 38 | |
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| 39 | int ext4_getfsmap(struct super_block *sb, struct ext4_fsmap_head *head, |
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| 40 | ext4_fsmap_format_t formatter, void *arg); |
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| 41 | |
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| 42 | #define EXT4_QUERY_RANGE_ABORT 1 |
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| 43 | #define EXT4_QUERY_RANGE_CONTINUE 0 |
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| 44 | |
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| 45 | /* fmr_owner special values for FS_IOC_GETFSMAP; some share w/ XFS */ |
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| 46 | #define EXT4_FMR_OWN_FREE FMR_OWN_FREE /* free space */ |
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| 47 | #define EXT4_FMR_OWN_UNKNOWN FMR_OWN_UNKNOWN /* unknown owner */ |
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| 48 | #define EXT4_FMR_OWN_FS FMR_OWNER('X', 1) /* static fs metadata */ |
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| 49 | #define EXT4_FMR_OWN_LOG FMR_OWNER('X', 2) /* journalling log */ |
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| 50 | #define EXT4_FMR_OWN_INODES FMR_OWNER('X', 5) /* inodes */ |
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| 51 | #define EXT4_FMR_OWN_GDT FMR_OWNER('f', 1) /* group descriptors */ |
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| 52 | #define EXT4_FMR_OWN_RESV_GDT FMR_OWNER('f', 2) /* reserved gdt blocks */ |
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| 53 | #define EXT4_FMR_OWN_BLKBM FMR_OWNER('f', 3) /* block bitmap */ |
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| 54 | #define EXT4_FMR_OWN_INOBM FMR_OWNER('f', 4) /* inode bitmap */ |
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| 55 | |
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| 56 | #endif /* __EXT4_FSMAP_H__ */ |
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| 57 | |
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