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/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will 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 version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
* GPL HEADER END
*/
/*
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* lustre/include/lustre/ll_fiemap.h
*
* FIEMAP data structures and flags. This header file will be used until
* fiemap.h is available in the upstream kernel.
*
* Author: Kalpak Shah <kalpak.shah@sun.com>
* Author: Andreas Dilger <adilger@sun.com>
*/
#ifndef _LUSTRE_FIEMAP_H
#define _LUSTRE_FIEMAP_H
struct ll_fiemap_extent {
__u64 fe_logical; /* logical offset in bytes for the start of
* the extent from the beginning of the file */
__u64 fe_physical; /* physical offset in bytes for the start
* of the extent from the beginning of the disk */
__u64 fe_length; /* length in bytes for this extent */
__u64 fe_reserved64[2];
__u32 fe_flags; /* FIEMAP_EXTENT_* flags for this extent */
__u32 fe_device; /* device number for this extent */
__u32 fe_reserved[2];
};
struct ll_user_fiemap {
__u64 fm_start; /* logical offset (inclusive) at
* which to start mapping (in) */
__u64 fm_length; /* logical length of mapping which
* userspace wants (in) */
__u32 fm_flags; /* FIEMAP_FLAG_* flags for request (in/out) */
__u32 fm_mapped_extents;/* number of extents that were mapped (out) */
__u32 fm_extent_count; /* size of fm_extents array (in) */
__u32 fm_reserved;
struct ll_fiemap_extent fm_extents[0]; /* array of mapped extents (out) */
};
#define FIEMAP_MAX_OFFSET (~0ULL)
#define FIEMAP_FLAG_SYNC 0x00000001 /* sync file data before map */
#define FIEMAP_FLAG_XATTR 0x00000002 /* map extended attribute tree */
#define FIEMAP_EXTENT_LAST 0x00000001 /* Last extent in file. */
#define FIEMAP_EXTENT_UNKNOWN 0x00000002 /* Data location unknown. */
#define FIEMAP_EXTENT_DELALLOC 0x00000004 /* Location still pending.
* Sets EXTENT_UNKNOWN. */
#define FIEMAP_EXTENT_ENCODED 0x00000008 /* Data can not be read
* while fs is unmounted */
#define FIEMAP_EXTENT_DATA_ENCRYPTED 0x00000080 /* Data is encrypted by fs.
* Sets EXTENT_NO_DIRECT. */
#define FIEMAP_EXTENT_NOT_ALIGNED 0x00000100 /* Extent offsets may not be
* block aligned. */
#define FIEMAP_EXTENT_DATA_INLINE 0x00000200 /* Data mixed with metadata.
* Sets EXTENT_NOT_ALIGNED.*/
#define FIEMAP_EXTENT_DATA_TAIL 0x00000400 /* Multiple files in block.
* Sets EXTENT_NOT_ALIGNED.*/
#define FIEMAP_EXTENT_UNWRITTEN 0x00000800 /* Space allocated, but
* no data (i.e. zero). */
#define FIEMAP_EXTENT_MERGED 0x00001000 /* File does not natively
* support extents. Result
* merged for efficiency. */
static inline size_t fiemap_count_to_size(size_t extent_count)
{
return (sizeof(struct ll_user_fiemap) + extent_count *
sizeof(struct ll_fiemap_extent));
}
static inline unsigned fiemap_size_to_count(size_t array_size)
{
return ((array_size - sizeof(struct ll_user_fiemap)) /
sizeof(struct ll_fiemap_extent));
}
#define FIEMAP_FLAG_DEVICE_ORDER 0x40000000 /* return device ordered mapping */
#ifdef FIEMAP_FLAGS_COMPAT
#undef FIEMAP_FLAGS_COMPAT
#endif
/* Lustre specific flags - use a high bit, don't conflict with upstream flag */
#define FIEMAP_EXTENT_NO_DIRECT 0x40000000 /* Data mapping undefined */
#define FIEMAP_EXTENT_NET 0x80000000 /* Data stored remotely.
* Sets NO_DIRECT flag */
#endif /* _LUSTRE_FIEMAP_H */
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