1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
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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.
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
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19 * version 2 along with this program; If not, see
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29 * Copyright 2008 Sun Microsystems, Inc. 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 #ifndef HAVE_LINUX_FIEMAP_H
50 struct ll_fiemap_extent {
51 __u64 fe_logical; /* logical offset in bytes for the start of
52 * the extent from the beginning of the file */
53 __u64 fe_physical; /* physical offset in bytes for the start
54 * of the extent from the beginning of the disk */
55 __u64 fe_length; /* length in bytes for the extent */
56 __u32 fe_flags; /* FIEMAP_EXTENT_* flags for the extent */
57 __u32 fe_device; /* device number for this extent */
60 struct 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) */
69 struct ll_fiemap_extent fm_extents[0]; /* array of mapped extents (out).
70 * Lustre uses first extent to
74 #define FIEMAP_MAX_OFFSET (~0ULL)
76 #define FIEMAP_FLAG_SYNC 0x00000001 /* sync file data before map */
77 #define FIEMAP_FLAG_XATTR 0x00000002 /* map extended attribute tree */
78 #define FIEMAP_FLAG_DEVICE_ORDER 0x40000000 /* return device ordered mapping */
80 #define FIEMAP_FLAGS_COMPAT (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR | \
81 FIEMAP_FLAG_DEVICE_ORDER)
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_NO_DIRECT 0x00000008 /* Data mapping undefined */
88 #define FIEMAP_EXTENT_SECONDARY 0x00000010 /* Data copied offline. May
89 * set EXTENT_NO_DIRECT. */
90 #define FIEMAP_EXTENT_NET 0x00000020 /* Data stored remotely.
91 * Sets EXTENT_NO_DIRECT. */
92 #define FIEMAP_EXTENT_DATA_COMPRESSED 0x00000040 /* Data is compressed by fs.
93 * Sets EXTENT_NO_DIRECT. */
94 #define FIEMAP_EXTENT_DATA_ENCRYPTED 0x00000080 /* Data is encrypted by fs.
95 * Sets EXTENT_NO_DIRECT. */
96 #define FIEMAP_EXTENT_NOT_ALIGNED 0x00000100 /* Extent offsets may not be
98 #define FIEMAP_EXTENT_DATA_INLINE 0x00000200 /* Data mixed with metadata.
99 * Sets EXTENT_NOT_ALIGNED.*/
100 #define FIEMAP_EXTENT_DATA_TAIL 0x00000400 /* Multiple files in block.
101 * Sets EXTENT_NOT_ALIGNED.*/
102 #define FIEMAP_EXTENT_UNWRITTEN 0x00000800 /* Space allocated, but
103 * no data (i.e. zero). */
104 #define FIEMAP_EXTENT_MERGED 0x00001000 /* File does not natively
105 * support extents. Result
106 * merged for efficiency. */
110 #define ll_fiemap_extent fiemap_extent
111 #define ll_user_fiemap fiemap
113 #endif /* HAVE_LINUX_FIEMAP_H */
115 static inline size_t fiemap_count_to_size(size_t extent_count)
117 return (sizeof(struct ll_user_fiemap) + extent_count *
118 sizeof(struct ll_fiemap_extent));
121 static inline unsigned fiemap_size_to_count(size_t array_size)
123 return ((array_size - sizeof(struct ll_user_fiemap)) /
124 sizeof(struct ll_fiemap_extent));
127 #endif /* _LUSTRE_FIEMAP_H */