2017-12-18 11:00:59 +08:00
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// SPDX-License-Identifier: GPL-2.0+
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2017-04-30 12:36:53 +08:00
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/*
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* Copyright (C) 2017 Oracle. All Rights Reserved.
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*
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*/
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#ifndef __EXT4_FSMAP_H__
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#define __EXT4_FSMAP_H__
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struct fsmap;
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/* internal fsmap representation */
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struct ext4_fsmap {
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struct list_head fmr_list;
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dev_t fmr_device; /* device id */
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uint32_t fmr_flags; /* mapping flags */
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uint64_t fmr_physical; /* device offset of segment */
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uint64_t fmr_owner; /* owner id */
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uint64_t fmr_length; /* length of segment, blocks */
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};
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struct ext4_fsmap_head {
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uint32_t fmh_iflags; /* control flags */
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uint32_t fmh_oflags; /* output flags */
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unsigned int fmh_count; /* # of entries in array incl. input */
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unsigned int fmh_entries; /* # of entries filled in (output). */
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struct ext4_fsmap fmh_keys[2]; /* low and high keys */
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};
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void ext4_fsmap_from_internal(struct super_block *sb, struct fsmap *dest,
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struct ext4_fsmap *src);
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void ext4_fsmap_to_internal(struct super_block *sb, struct ext4_fsmap *dest,
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struct fsmap *src);
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/* fsmap to userspace formatter - copy to user & advance pointer */
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typedef int (*ext4_fsmap_format_t)(struct ext4_fsmap *, void *);
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int ext4_getfsmap(struct super_block *sb, struct ext4_fsmap_head *head,
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ext4_fsmap_format_t formatter, void *arg);
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#define EXT4_QUERY_RANGE_ABORT 1
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#define EXT4_QUERY_RANGE_CONTINUE 0
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/* fmr_owner special values for FS_IOC_GETFSMAP; some share w/ XFS */
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#define EXT4_FMR_OWN_FREE FMR_OWN_FREE /* free space */
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#define EXT4_FMR_OWN_UNKNOWN FMR_OWN_UNKNOWN /* unknown owner */
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#define EXT4_FMR_OWN_FS FMR_OWNER('X', 1) /* static fs metadata */
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#define EXT4_FMR_OWN_LOG FMR_OWNER('X', 2) /* journalling log */
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#define EXT4_FMR_OWN_INODES FMR_OWNER('X', 5) /* inodes */
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#define EXT4_FMR_OWN_GDT FMR_OWNER('f', 1) /* group descriptors */
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#define EXT4_FMR_OWN_RESV_GDT FMR_OWNER('f', 2) /* reserved gdt blocks */
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#define EXT4_FMR_OWN_BLKBM FMR_OWNER('f', 3) /* inode bitmap */
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#define EXT4_FMR_OWN_INOBM FMR_OWNER('f', 4) /* block bitmap */
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#endif /* __EXT4_FSMAP_H__ */
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