0c9ec4beec
Support the GETFSMAP ioctls so that we can use the xfs free space management tools to probe ext4 as well. Note that this is a partial implementation -- we only report fixed-location metadata and free space; everything else is reported as "unknown". Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
69 lines
2.7 KiB
C
69 lines
2.7 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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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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