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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).
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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/
31 * FIEMAP data structures and flags. This header file will be used until
32 * fiemap.h is available in the upstream kernel.
34 * Author: Kalpak Shah <kalpak.shah@sun.com>
35 * Author: Andreas Dilger <adilger@sun.com>
38 #ifndef _LUSTRE_FIEMAP_H
39 #define _LUSTRE_FIEMAP_H
42 #include <linux/fiemap.h>
43 #include <linux/types.h>
46 * XXX: We use fiemap_extent::fe_reserved[0], notice the high 16bits of it
47 * is used to locate the stripe number starting from the very beginning to
48 * resume the fiemap call.
50 #define fe_device fe_reserved[0]
52 static inline int get_fe_device(struct fiemap_extent *fe)
54 return fe->fe_device & 0xffff;
56 static inline void set_fe_device(struct fiemap_extent *fe, int devno)
58 fe->fe_device = (fe->fe_device & 0xffff0000) | (devno & 0xffff);
60 static inline int get_fe_stripenr(struct fiemap_extent *fe)
62 return fe->fe_device >> 16;
64 static inline void set_fe_stripenr(struct fiemap_extent *fe, int nr)
66 fe->fe_device = (fe->fe_device & 0xffff) | (nr << 16);
68 static inline void set_fe_device_stripenr(struct fiemap_extent *fe, int devno,
71 fe->fe_device = (nr << 16) | (devno & 0xffff);
74 static inline __kernel_size_t fiemap_count_to_size(__kernel_size_t extent_count)
76 return sizeof(struct fiemap) + extent_count *
77 sizeof(struct fiemap_extent);
80 static inline unsigned int fiemap_size_to_count(__kernel_size_t array_size)
82 return (array_size - sizeof(struct fiemap)) /
83 sizeof(struct fiemap_extent);
86 #define FIEMAP_FLAG_DEVICE_ORDER 0x40000000 /* return device ordered mapping */
88 #ifdef FIEMAP_FLAGS_COMPAT
89 #undef FIEMAP_FLAGS_COMPAT
92 #define FIEMAP_EXTENT_NET 0x80000000 /* Data stored remotely.
93 * Sets NO_DIRECT flag */
95 #endif /* _LUSTRE_FIEMAP_H */