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33 * This file is part of Lustre, http://www.lustre.org/
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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 struct ll_fiemap_extent {
49 __u64 fe_logical; /* logical offset in bytes for the start of
50 * the extent from the beginning of the file
52 __u64 fe_physical; /* physical offset in bytes for the start
53 * of the extent from the beginning of the disk
55 __u64 fe_length; /* length in bytes for this extent */
56 __u64 fe_reserved64[2];
57 __u32 fe_flags; /* FIEMAP_EXTENT_* flags for this extent */
58 __u32 fe_device; /* device number for this extent */
62 struct ll_user_fiemap {
63 __u64 fm_start; /* logical offset (inclusive) at
64 * which to start mapping (in)
66 __u64 fm_length; /* logical length of mapping which
67 * userspace wants (in)
69 __u32 fm_flags; /* FIEMAP_FLAG_* flags for request (in/out) */
70 __u32 fm_mapped_extents;/* number of extents that were mapped (out) */
71 __u32 fm_extent_count; /* size of fm_extents array (in) */
73 struct ll_fiemap_extent fm_extents[0]; /* array of mapped extents (out) */
76 #define FIEMAP_MAX_OFFSET (~0ULL)
78 #define FIEMAP_FLAG_SYNC 0x00000001 /* sync file data before
81 #define FIEMAP_FLAG_XATTR 0x00000002 /* map extended attribute
84 #define FIEMAP_EXTENT_LAST 0x00000001 /* Last extent in file. */
85 #define FIEMAP_EXTENT_UNKNOWN 0x00000002 /* Data location unknown. */
86 #define FIEMAP_EXTENT_DELALLOC 0x00000004 /* Location still pending.
87 * Sets EXTENT_UNKNOWN.
89 #define FIEMAP_EXTENT_ENCODED 0x00000008 /* Data can not be read
90 * while fs is unmounted
92 #define FIEMAP_EXTENT_DATA_ENCRYPTED 0x00000080 /* Data is encrypted by fs.
93 * Sets EXTENT_NO_DIRECT.
95 #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.
103 #define FIEMAP_EXTENT_UNWRITTEN 0x00000800 /* Space allocated, but
104 * no data (i.e. zero).
106 #define FIEMAP_EXTENT_MERGED 0x00001000 /* File does not natively
107 * support extents. Result
108 * merged for efficiency.
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
135 #endif /* _LUSTRE_FIEMAP_H */