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Edit File : fsmap.h \| Size : 4.29 KB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note / / * FS_IOC_GETFSMAP ioctl infrastructure. * * Copyright (C) 2017 Oracle. All Rights Reserved. * * Author: Darrick J. Wong <darrick.wong@oracle.com> / #ifndef _LINUX_FSMAP_H #define _LINUX_FSMAP_H #include <linux/types.h> / * Structure for FS_IOC_GETFSMAP. * * The memory layout for this call are the scalar values defined in * struct fsmap_head, followed by two struct fsmap that describe * the lower and upper bound of mappings to return, followed by an * array of struct fsmap mappings. * * fmh_iflags control the output of the call, whereas fmh_oflags report * on the overall record output. fmh_count should be set to the * length of the fmh_recs array, and fmh_entries will be set to the * number of entries filled out during each call. If fmh_count is * zero, the number of reverse mappings will be returned in * fmh_entries, though no mappings will be returned. fmh_reserved * must be set to zero. * * The two elements in the fmh_keys array are used to constrain the * output. The first element in the array should represent the * lowest disk mapping ("low key") that the user wants to learn * about. If this value is all zeroes, the filesystem will return * the first entry it knows about. For a subsequent call, the * contents of fsmap_head.fmh_recs[fsmap_head.fmh_count - 1] should be * copied into fmh_keys[0] to have the kernel start where it left off. * * The second element in the fmh_keys array should represent the * highest disk mapping ("high key") that the user wants to learn * about. If this value is all ones, the filesystem will not stop * until it runs out of mapping to return or runs out of space in * fmh_recs. * * fmr_device can be either a 32-bit cookie representing a device, or * a 32-bit dev_t if the FMH_OF_DEV_T flag is set. fmr_physical, * fmr_offset, and fmr_length are expressed in units of bytes. * fmr_owner is either an inode number, or a special value if * FMR_OF_SPECIAL_OWNER is set in fmr_flags. / 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 dataset / / 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 / _LINUX_FSMAP_H */ Back

Edit File : fsmap.h | Size : 4.29 KB

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * FS_IOC_GETFSMAP ioctl infrastructure.
 *
 * Copyright (C) 2017 Oracle.  All Rights Reserved.
 *
 * Author: Darrick J. Wong <darrick.wong@oracle.com>
 */
#ifndef _LINUX_FSMAP_H
#define _LINUX_FSMAP_H

#include <linux/types.h>

/*
 *	Structure for FS_IOC_GETFSMAP.
 *
 *	The memory layout for this call are the scalar values defined in
 *	struct fsmap_head, followed by two struct fsmap that describe
 *	the lower and upper bound of mappings to return, followed by an
 *	array of struct fsmap mappings.
 *
 *	fmh_iflags control the output of the call, whereas fmh_oflags report
 *	on the overall record output.  fmh_count should be set to the
 *	length of the fmh_recs array, and fmh_entries will be set to the
 *	number of entries filled out during each call.  If fmh_count is
 *	zero, the number of reverse mappings will be returned in
 *	fmh_entries, though no mappings will be returned.  fmh_reserved
 *	must be set to zero.
 *
 *	The two elements in the fmh_keys array are used to constrain the
 *	output.  The first element in the array should represent the
 *	lowest disk mapping ("low key") that the user wants to learn
 *	about.  If this value is all zeroes, the filesystem will return
 *	the first entry it knows about.  For a subsequent call, the
 *	contents of fsmap_head.fmh_recs[fsmap_head.fmh_count - 1] should be
 *	copied into fmh_keys[0] to have the kernel start where it left off.
 *
 *	The second element in the fmh_keys array should represent the
 *	highest disk mapping ("high key") that the user wants to learn
 *	about.  If this value is all ones, the filesystem will not stop
 *	until it runs out of mapping to return or runs out of space in
 *	fmh_recs.
 *
 *	fmr_device can be either a 32-bit cookie representing a device, or
 *	a 32-bit dev_t if the FMH_OF_DEV_T flag is set.  fmr_physical,
 *	fmr_offset, and fmr_length are expressed in units of bytes.
 *	fmr_owner is either an inode number, or a special value if
 *	FMR_OF_SPECIAL_OWNER is set in fmr_flags.
 */
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 dataset */

/* 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 /* _LINUX_FSMAP_H */

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