/*
|
* Copyright (c) 2017 Oracle.
|
* All Rights Reserved.
|
*
|
* Author: Darrick J. Wong <darrick.wong@oracle.com>
|
*
|
* This program is free software; you can redistribute it and/or
|
* modify it under the terms of the GNU General Public License as
|
* published by the Free Software Foundation.
|
*
|
* This program is distributed in the hope that it would be useful,
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
* GNU General Public License for more details.
|
*
|
* You should have received a copy of the GNU General Public License
|
* along with this program; if not, write the Free Software Foundation,
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
*/
|
#ifndef FSMAP_H_
|
#define FSMAP_H_
|
|
/* FS_IOC_GETFSMAP ioctl definitions */
|
#ifndef FS_IOC_GETFSMAP
|
struct fsmap {
|
__u32 fmr_device; /* device id */
|
__u32 fmr_flags; /* mapping flags */
|
__u64 fmr_physical; /* device offset of segment */
|
__u64 fmr_owner; /* owner id */
|
__u64 fmr_offset; /* file offset of segment */
|
__u64 fmr_length; /* length of segment */
|
__u64 fmr_reserved[3]; /* must be zero */
|
};
|
|
struct fsmap_head {
|
__u32 fmh_iflags; /* control flags */
|
__u32 fmh_oflags; /* output flags */
|
__u32 fmh_count; /* # of entries in array incl. input */
|
__u32 fmh_entries; /* # of entries filled in (output). */
|
__u64 fmh_reserved[6]; /* must be zero */
|
|
struct fsmap fmh_keys[2]; /* low and high keys for the mapping search */
|
struct fsmap fmh_recs[]; /* returned records */
|
};
|
|
/* Size of an fsmap_head with room for nr records. */
|
static inline size_t
|
fsmap_sizeof(
|
unsigned int nr)
|
{
|
return sizeof(struct fsmap_head) + nr * sizeof(struct fsmap);
|
}
|
|
/* Start the next fsmap query at the end of the current query results. */
|
static inline void
|
fsmap_advance(
|
struct fsmap_head *head)
|
{
|
head->fmh_keys[0] = head->fmh_recs[head->fmh_entries - 1];
|
}
|
|
/* fmh_iflags values - set by FS_IOC_GETFSMAP caller in the header. */
|
/* no flags defined yet */
|
#define FMH_IF_VALID 0
|
|
/* fmh_oflags values - returned in the header segment only. */
|
#define FMH_OF_DEV_T 0x1 /* fmr_device values will be dev_t */
|
|
/* fmr_flags values - returned for each non-header segment */
|
#define FMR_OF_PREALLOC 0x1 /* segment = unwritten pre-allocation */
|
#define FMR_OF_ATTR_FORK 0x2 /* segment = attribute fork */
|
#define FMR_OF_EXTENT_MAP 0x4 /* segment = extent map */
|
#define FMR_OF_SHARED 0x8 /* segment = shared with another file */
|
#define FMR_OF_SPECIAL_OWNER 0x10 /* owner is a special value */
|
#define FMR_OF_LAST 0x20 /* segment is the last in the FS */
|
|
/* Each FS gets to define its own special owner codes. */
|
#define FMR_OWNER(type, code) (((__u64)type << 32) | \
|
((__u64)code & 0xFFFFFFFFULL))
|
#define FMR_OWNER_TYPE(owner) ((__u32)((__u64)owner >> 32))
|
#define FMR_OWNER_CODE(owner) ((__u32)(((__u64)owner & 0xFFFFFFFFULL)))
|
#define FMR_OWN_FREE FMR_OWNER(0, 1) /* free space */
|
#define FMR_OWN_UNKNOWN FMR_OWNER(0, 2) /* unknown owner */
|
#define FMR_OWN_METADATA FMR_OWNER(0, 3) /* metadata */
|
|
#define FS_IOC_GETFSMAP _IOWR('X', 59, struct fsmap_head)
|
#endif /* FS_IOC_GETFSMAP */
|
|
#endif
|
