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34 * lustre/include/lustre/ll_fiemap.h
36 * FIEMAP data structures and flags. This header file will be used until
37 * fiemap.h is available in the upstream kernel.
39 * Author: Kalpak Shah <kalpak.shah@sun.com>
40 * Author: Andreas Dilger <adilger@sun.com>
43 #ifndef _LUSTRE_FIEMAP_H
44 #define _LUSTRE_FIEMAP_H
46 #if !defined(__KERNEL__)
49 #include <libcfs/types.h>
51 struct ll_fiemap_extent {
52 __u64 fe_logical; /* logical offset in bytes for the start of
53 * the extent from the beginning of the file */
54 __u64 fe_physical; /* physical offset in bytes for the start
55 * of the extent from the beginning of the disk */
56 __u64 fe_length; /* length in bytes for this extent */
57 __u64 fe_reserved64[2];
58 __u32 fe_flags; /* FIEMAP_EXTENT_* flags for this extent */
59 __u32 fe_device; /* device number for this extent */
63 struct ll_user_fiemap {
64 __u64 fm_start; /* logical offset (inclusive) at
65 * which to start mapping (in) */
66 __u64 fm_length; /* logical length of mapping which
67 * userspace wants (in) */
68 __u32 fm_flags; /* FIEMAP_FLAG_* flags for request (in/out) */
69 __u32 fm_mapped_extents;/* number of extents that were mapped (out) */
70 __u32 fm_extent_count; /* size of fm_extents array (in) */
72 struct ll_fiemap_extent fm_extents[0]; /* array of mapped extents (out) */
75 #define FIEMAP_MAX_OFFSET (~0ULL)
77 #define FIEMAP_FLAG_SYNC 0x00000001 /* sync file data before map */
78 #define FIEMAP_FLAG_XATTR 0x00000002 /* map extended attribute tree */
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. */
84 #define FIEMAP_EXTENT_ENCODED 0x00000008 /* Data can not be read
85 * while fs is unmounted */
86 #define FIEMAP_EXTENT_DATA_ENCRYPTED 0x00000080 /* Data is encrypted by fs.
87 * Sets EXTENT_NO_DIRECT. */
88 #define FIEMAP_EXTENT_NOT_ALIGNED 0x00000100 /* Extent offsets may not be
90 #define FIEMAP_EXTENT_DATA_INLINE 0x00000200 /* Data mixed with metadata.
91 * Sets EXTENT_NOT_ALIGNED.*/
92 #define FIEMAP_EXTENT_DATA_TAIL 0x00000400 /* Multiple files in block.
93 * Sets EXTENT_NOT_ALIGNED.*/
94 #define FIEMAP_EXTENT_UNWRITTEN 0x00000800 /* Space allocated, but
95 * no data (i.e. zero). */
96 #define FIEMAP_EXTENT_MERGED 0x00001000 /* File does not natively
97 * support extents. Result
98 * merged for efficiency. */
101 #define ll_fiemap_extent fiemap_extent
102 #define ll_user_fiemap fiemap
103 #define fe_device fe_reserved[0]
105 #endif /* HAVE_LINUX_FIEMAP_H */
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 */
130 #endif /* _LUSTRE_FIEMAP_H */