forked from luck/tmp_suning_uos_patched
e89c041338
Introduce a new ioctl that uses the reverse mapping btree to return information about the physical layout of the filesystem. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
54 lines
1.9 KiB
C
54 lines
1.9 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 __XFS_FSMAP_H__
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#define __XFS_FSMAP_H__
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struct fsmap;
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/* internal fsmap representation */
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struct xfs_fsmap {
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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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xfs_fileoff_t fmr_offset; /* file offset of segment */
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xfs_filblks_t fmr_length; /* length of segment, blocks */
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};
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struct xfs_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 xfs_fsmap fmh_keys[2]; /* low and high keys */
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};
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void xfs_fsmap_from_internal(struct fsmap *dest, struct xfs_fsmap *src);
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void xfs_fsmap_to_internal(struct xfs_fsmap *dest, struct fsmap *src);
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/* fsmap to userspace formatter - copy to user & advance pointer */
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typedef int (*xfs_fsmap_format_t)(struct xfs_fsmap *, void *);
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int xfs_getfsmap(struct xfs_mount *mp, struct xfs_fsmap_head *head,
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xfs_fsmap_format_t formatter, void *arg);
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#endif /* __XFS_FSMAP_H__ */
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