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