4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.
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).
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.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2014, 2015, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lustre/include/lustre/ll_fiemap.h
34 * FIEMAP data structures and flags. This header file will be used until
35 * fiemap.h is available in the upstream kernel.
37 * Author: Kalpak Shah <kalpak.shah@sun.com>
38 * Author: Andreas Dilger <adilger@sun.com>
41 #ifndef _LUSTRE_FIEMAP_H
42 #define _LUSTRE_FIEMAP_H
44 struct ll_fiemap_extent {
45 __u64 fe_logical; /* logical offset in bytes for the start of
46 * the extent from the beginning of the file
48 __u64 fe_physical; /* physical offset in bytes for the start
49 * of the extent from the beginning of the disk
51 __u64 fe_length; /* length in bytes for this extent */
52 __u64 fe_reserved64[2];
53 __u32 fe_flags; /* FIEMAP_EXTENT_* flags for this extent */
54 __u32 fe_device; /* device number for this extent */
58 struct ll_user_fiemap {
59 __u64 fm_start; /* logical offset (inclusive) at
60 * which to start mapping (in)
62 __u64 fm_length; /* logical length of mapping which
63 * 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) */
69 struct ll_fiemap_extent fm_extents[0]; /* array of mapped extents (out) */
72 #define FIEMAP_MAX_OFFSET (~0ULL)
74 #define FIEMAP_FLAG_SYNC 0x00000001 /* sync file data before
77 #define FIEMAP_FLAG_XATTR 0x00000002 /* map extended attribute
80 #define FIEMAP_EXTENT_LAST 0x00000001 /* Last extent in file. */
81 #define FIEMAP_EXTENT_UNKNOWN 0x00000002 /* Data location unknown. */
82 #define FIEMAP_EXTENT_DELALLOC 0x00000004 /* Location still pending.
83 * Sets EXTENT_UNKNOWN.
85 #define FIEMAP_EXTENT_ENCODED 0x00000008 /* Data can not be read
86 * while fs is unmounted
88 #define FIEMAP_EXTENT_DATA_ENCRYPTED 0x00000080 /* Data is encrypted by fs.
89 * Sets EXTENT_NO_DIRECT.
91 #define FIEMAP_EXTENT_NOT_ALIGNED 0x00000100 /* Extent offsets may not be
94 #define FIEMAP_EXTENT_DATA_INLINE 0x00000200 /* Data mixed with metadata.
95 * Sets EXTENT_NOT_ALIGNED.*/
96 #define FIEMAP_EXTENT_DATA_TAIL 0x00000400 /* Multiple files in block.
97 * Sets EXTENT_NOT_ALIGNED.
99 #define FIEMAP_EXTENT_UNWRITTEN 0x00000800 /* Space allocated, but
100 * no data (i.e. zero).
102 #define FIEMAP_EXTENT_MERGED 0x00001000 /* File does not natively
103 * support extents. Result
104 * merged for efficiency.
107 static inline size_t fiemap_count_to_size(size_t extent_count)
109 return (sizeof(struct ll_user_fiemap) + extent_count *
110 sizeof(struct ll_fiemap_extent));
113 static inline unsigned fiemap_size_to_count(size_t array_size)
115 return ((array_size - sizeof(struct ll_user_fiemap)) /
116 sizeof(struct ll_fiemap_extent));
119 #define FIEMAP_FLAG_DEVICE_ORDER 0x40000000 /* return device ordered mapping */
121 #ifdef FIEMAP_FLAGS_COMPAT
122 #undef FIEMAP_FLAGS_COMPAT
125 /* Lustre specific flags - use a high bit, don't conflict with upstream flag */
126 #define FIEMAP_EXTENT_NO_DIRECT 0x40000000 /* Data mapping undefined */
127 #define FIEMAP_EXTENT_NET 0x80000000 /* Data stored remotely.
128 * Sets NO_DIRECT flag
131 #endif /* _LUSTRE_FIEMAP_H */