From fe5b2d5cb7b87addd99b96ece1557302eae1f8f0 Mon Sep 17 00:00:00 2001
From: kalpak <kalpak>
Date: Thu, 7 Aug 2008 21:34:35 +0000
Subject: [PATCH] b=10555 i=adilger i=green
add ll_fiemap.h
---
lustre/include/lustre/ll_fiemap.h | 94 +++++++++++++++++++++++++++++++
1 file changed, 94 insertions(+)
create mode 100644 lustre/include/lustre/ll_fiemap.h
diff --git a/lustre/include/lustre/ll_fiemap.h b/lustre/include/lustre/ll_fiemap.h
new file mode 100644
index 0000000000..cad21f9ca5
--- /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 */
--
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