90 lines
3.1 KiB
C
90 lines
3.1 KiB
C
/*
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* Copyright (c) 2017 Oracle.
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* 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 as
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* published by the Free Software Foundation.
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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 FSMAP_H_
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#define FSMAP_H_
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/* FS_IOC_GETFSMAP ioctl definitions */
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#ifndef FS_IOC_GETFSMAP
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struct fsmap {
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__u32 fmr_device; /* device id */
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__u32 fmr_flags; /* mapping flags */
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__u64 fmr_physical; /* device offset of segment */
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__u64 fmr_owner; /* owner id */
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__u64 fmr_offset; /* file offset of segment */
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__u64 fmr_length; /* length of segment */
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__u64 fmr_reserved[3]; /* must be zero */
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};
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struct fsmap_head {
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__u32 fmh_iflags; /* control flags */
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__u32 fmh_oflags; /* output flags */
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__u32 fmh_count; /* # of entries in array incl. input */
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__u32 fmh_entries; /* # of entries filled in (output). */
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__u64 fmh_reserved[6]; /* must be zero */
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struct fsmap fmh_keys[2]; /* low and high keys for the mapping search */
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struct fsmap fmh_recs[]; /* returned records */
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};
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/* Size of an fsmap_head with room for nr records. */
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static inline size_t
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fsmap_sizeof(
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unsigned int nr)
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{
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return sizeof(struct fsmap_head) + nr * sizeof(struct fsmap);
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}
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/* Start the next fsmap query at the end of the current query results. */
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static inline void
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fsmap_advance(
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struct fsmap_head *head)
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{
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head->fmh_keys[0] = head->fmh_recs[head->fmh_entries - 1];
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}
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/* fmh_iflags values - set by FS_IOC_GETFSMAP caller in the header. */
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/* no flags defined yet */
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#define FMH_IF_VALID 0
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/* fmh_oflags values - returned in the header segment only. */
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#define FMH_OF_DEV_T 0x1 /* fmr_device values will be dev_t */
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/* fmr_flags values - returned for each non-header segment */
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#define FMR_OF_PREALLOC 0x1 /* segment = unwritten pre-allocation */
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#define FMR_OF_ATTR_FORK 0x2 /* segment = attribute fork */
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#define FMR_OF_EXTENT_MAP 0x4 /* segment = extent map */
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#define FMR_OF_SHARED 0x8 /* segment = shared with another file */
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#define FMR_OF_SPECIAL_OWNER 0x10 /* owner is a special value */
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#define FMR_OF_LAST 0x20 /* segment is the last in the FS */
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/* Each FS gets to define its own special owner codes. */
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#define FMR_OWNER(type, code) (((__u64)type << 32) | \
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((__u64)code & 0xFFFFFFFFULL))
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#define FMR_OWNER_TYPE(owner) ((__u32)((__u64)owner >> 32))
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#define FMR_OWNER_CODE(owner) ((__u32)(((__u64)owner & 0xFFFFFFFFULL)))
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#define FMR_OWN_FREE FMR_OWNER(0, 1) /* free space */
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#define FMR_OWN_UNKNOWN FMR_OWNER(0, 2) /* unknown owner */
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#define FMR_OWN_METADATA FMR_OWNER(0, 3) /* metadata */
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#define FS_IOC_GETFSMAP _IOWR('X', 59, struct fsmap_head)
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#endif /* FS_IOC_GETFSMAP */
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#endif
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