1/* 2 * GPL HEADER START 3 * 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 only, 8 * as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License version 2 for more details (a copy is included 14 * in the LICENSE file that accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License 17 * version 2 along with this program; If not, see 18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf 19 * 20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 21 * CA 95054 USA or visit www.sun.com if you need additional information or 22 * have any questions. 23 * 24 * GPL HEADER END 25 */ 26/* 27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. 28 * Use is subject to license terms. 29 */ 30/* 31 * This file is part of Lustre, http://www.lustre.org/ 32 * Lustre is a trademark of Sun Microsystems, Inc. 33 * 34 * lustre/include/lustre/ll_fiemap.h 35 * 36 * FIEMAP data structures and flags. This header file will be used until 37 * fiemap.h is available in the upstream kernel. 38 * 39 * Author: Kalpak Shah <kalpak.shah@sun.com> 40 * Author: Andreas Dilger <adilger@sun.com> 41 */ 42 43#ifndef _LUSTRE_FIEMAP_H 44#define _LUSTRE_FIEMAP_H 45 46 47 48struct ll_fiemap_extent { 49 __u64 fe_logical; /* logical offset in bytes for the start of 50 * the extent from the beginning of the file */ 51 __u64 fe_physical; /* physical offset in bytes for the start 52 * of the extent from the beginning of the disk */ 53 __u64 fe_length; /* length in bytes for this extent */ 54 __u64 fe_reserved64[2]; 55 __u32 fe_flags; /* FIEMAP_EXTENT_* flags for this extent */ 56 __u32 fe_device; /* device number for this extent */ 57 __u32 fe_reserved[2]; 58}; 59 60struct ll_user_fiemap { 61 __u64 fm_start; /* logical offset (inclusive) at 62 * which to start mapping (in) */ 63 __u64 fm_length; /* logical length of mapping which 64 * userspace wants (in) */ 65 __u32 fm_flags; /* FIEMAP_FLAG_* flags for request (in/out) */ 66 __u32 fm_mapped_extents;/* number of extents that were mapped (out) */ 67 __u32 fm_extent_count; /* size of fm_extents array (in) */ 68 __u32 fm_reserved; 69 struct ll_fiemap_extent fm_extents[0]; /* array of mapped extents (out) */ 70}; 71 72#define FIEMAP_MAX_OFFSET (~0ULL) 73 74#define FIEMAP_FLAG_SYNC 0x00000001 /* sync file data before map */ 75#define FIEMAP_FLAG_XATTR 0x00000002 /* map extended attribute tree */ 76 77#define FIEMAP_EXTENT_LAST 0x00000001 /* Last extent in file. */ 78#define FIEMAP_EXTENT_UNKNOWN 0x00000002 /* Data location unknown. */ 79#define FIEMAP_EXTENT_DELALLOC 0x00000004 /* Location still pending. 80 * Sets EXTENT_UNKNOWN. */ 81#define FIEMAP_EXTENT_ENCODED 0x00000008 /* Data can not be read 82 * while fs is unmounted */ 83#define FIEMAP_EXTENT_DATA_ENCRYPTED 0x00000080 /* Data is encrypted by fs. 84 * Sets EXTENT_NO_DIRECT. */ 85#define FIEMAP_EXTENT_NOT_ALIGNED 0x00000100 /* Extent offsets may not be 86 * block aligned. */ 87#define FIEMAP_EXTENT_DATA_INLINE 0x00000200 /* Data mixed with metadata. 88 * Sets EXTENT_NOT_ALIGNED.*/ 89#define FIEMAP_EXTENT_DATA_TAIL 0x00000400 /* Multiple files in block. 90 * Sets EXTENT_NOT_ALIGNED.*/ 91#define FIEMAP_EXTENT_UNWRITTEN 0x00000800 /* Space allocated, but 92 * no data (i.e. zero). */ 93#define FIEMAP_EXTENT_MERGED 0x00001000 /* File does not natively 94 * support extents. Result 95 * merged for efficiency. */ 96 97 98static inline size_t fiemap_count_to_size(size_t extent_count) 99{ 100 return (sizeof(struct ll_user_fiemap) + extent_count * 101 sizeof(struct ll_fiemap_extent)); 102} 103 104static inline unsigned fiemap_size_to_count(size_t array_size) 105{ 106 return ((array_size - sizeof(struct ll_user_fiemap)) / 107 sizeof(struct ll_fiemap_extent)); 108} 109 110#define FIEMAP_FLAG_DEVICE_ORDER 0x40000000 /* return device ordered mapping */ 111 112#ifdef FIEMAP_FLAGS_COMPAT 113#undef FIEMAP_FLAGS_COMPAT 114#endif 115 116/* Lustre specific flags - use a high bit, don't conflict with upstream flag */ 117#define FIEMAP_EXTENT_NO_DIRECT 0x40000000 /* Data mapping undefined */ 118#define FIEMAP_EXTENT_NET 0x80000000 /* Data stored remotely. 119 * Sets NO_DIRECT flag */ 120 121#endif /* _LUSTRE_FIEMAP_H */ 122