b=10555

i=adilger
i=green

add ll_fiemap.h

diff --git a/lustre/include/lustre/ll_fiemap.h b/lustre/include/lustre/ll_fiemap.h
new file mode 100644 (file)
index 0000000..cad21f9
--- /dev/null
+++ b/lustre/include/lustre/ll_fiemap.h
@@ -0,0 +1,94 @@
+/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=8:tabstop=8:
+ *
+ *   This file is part of Lustre, http://www.lustre.org
+ *
+ * FIEMAP data structures and flags. This header file will be used until
+ * fiemap.h is available in the upstream kernel.
+ */
+
+#ifndef _LUSTRE_FIEMAP_H
+#define _LUSTRE_FIEMAP_H
+
+#ifndef HAVE_LINUX_FIEMAP_H
+
+#include <linux/lustre_types.h>
+
+struct ll_fiemap_extent {
+        __u64   fe_logical;  /* logical offset in bytes for the start of
+                              * the extent from the beginning of the file */
+        __u64   fe_physical; /* physical offset in bytes for the start
+                              * of the extent from the beginning of the disk */
+        __u64   fe_length;   /* length in bytes for the extent */
+        __u32   fe_flags;    /* FIEMAP_EXTENT_* flags for the extent */
+        __u32   fe_device;   /* device number for this extent */
+};
+
+struct ll_user_fiemap {
+        __u64   fm_start;         /* logical offset (inclusive) at
+                                   * which to start mapping (in) */
+        __u64   fm_length;        /* logical length of mapping which
+                                   * userspace wants (in) */
+        __u32   fm_flags;         /* FIEMAP_FLAG_* flags for request (in/out) */
+        __u32   fm_mapped_extents;/* number of extents that were mapped (out) */
+        __u32   fm_extent_count;  /* size of fm_extents array (in) */
+        __u32   fm_reserved;
+        struct  ll_fiemap_extent   fm_extents[0]; /* array of mapped extents (out).
+                                                   * Lustre uses first extent to
+                                                   * send end_offset */
+};
+
+#define FIEMAP_MAX_OFFSET      (~0ULL)
+
+#define FIEMAP_FLAG_SYNC         0x00000001 /* sync file data before map */
+#define FIEMAP_FLAG_XATTR        0x00000002 /* map extended attribute tree */
+#define FIEMAP_FLAG_DEVICE_ORDER 0x40000000 /* return device ordered mapping */
+
+#define FIEMAP_FLAGS_COMPAT    (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR | \
+                                FIEMAP_FLAG_DEVICE_ORDER)
+
+#define FIEMAP_EXTENT_LAST             0x00000001 /* Last extent in file. */
+#define FIEMAP_EXTENT_UNKNOWN          0x00000002 /* Data location unknown. */
+#define FIEMAP_EXTENT_DELALLOC         0x00000004 /* Location still pending.
+                                                   * Sets EXTENT_UNKNOWN. */
+#define FIEMAP_EXTENT_NO_DIRECT        0x00000008 /* Data mapping undefined */
+#define FIEMAP_EXTENT_SECONDARY        0x00000010 /* Data copied offline. May
+                                                   * set EXTENT_NO_DIRECT. */
+#define FIEMAP_EXTENT_NET              0x00000020 /* Data stored remotely.
+                                                   * Sets EXTENT_NO_DIRECT. */
+#define FIEMAP_EXTENT_DATA_COMPRESSED  0x00000040 /* Data is compressed by fs.
+                                                   * Sets EXTENT_NO_DIRECT. */
+#define FIEMAP_EXTENT_DATA_ENCRYPTED   0x00000080 /* Data is encrypted by fs.
+                                                   * Sets EXTENT_NO_DIRECT. */
+#define FIEMAP_EXTENT_NOT_ALIGNED      0x00000100 /* Extent offsets may not be
+                                                   * block aligned. */
+#define FIEMAP_EXTENT_DATA_INLINE      0x00000200 /* Data mixed with metadata.
+                                                   * Sets EXTENT_NOT_ALIGNED.*/
+#define FIEMAP_EXTENT_DATA_TAIL        0x00000400 /* Multiple files in block.
+                                                   * Sets EXTENT_NOT_ALIGNED.*/
+#define FIEMAP_EXTENT_UNWRITTEN        0x00000800 /* Space allocated, but
+                                                   * no data (i.e. zero). */
+#define FIEMAP_EXTENT_MERGED           0x00001000 /* File does not natively
+                                                   * support extents. Result
+                                                   * merged for efficiency. */
+
+#else
+
+#define ll_fiemap_extent fiemap_extent
+#define ll_user_fiemap   fiemap
+
+#endif /* HAVE_LINUX_FIEMAP_H */
+
+static inline size_t fiemap_count_to_size(size_t extent_count)
+{
+        return (sizeof(struct ll_user_fiemap) + extent_count *
+                                               sizeof(struct ll_fiemap_extent));
+}
+
+static inline unsigned fiemap_size_to_count(size_t array_size)
+{
+        return ((array_size - sizeof(struct ll_user_fiemap)) /
+                                               sizeof(struct ll_fiemap_extent));
+}
+
+#endif /* _LUSTRE_FIEMAP_H */