crush: sync up with userspace

.. up to ceph.git commit 1db1abc8328d ("crush: eliminate ad hoc diff
between kernel and userspace").  This fixes a bunch of recently pulled
coding style issues and makes includes a bit cleaner.

A patch "crush:Make the function crush_ln static" from Nicholas Krause
<xerofoify@gmail.com> is folded in as crush_ln() has been made static
in userspace as well.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

include/linux/crush/crush.h

@@ -1,7 +1,11 @@
 #ifndef CEPH_CRUSH_CRUSH_H
 #define CEPH_CRUSH_CRUSH_H
 
-#include <linux/types.h>
+#ifdef __KERNEL__
+# include <linux/types.h>
+#else
+# include "crush_compat.h"
+#endif
 
 /*
  * CRUSH is a pseudo-random data distribution algorithm that
@@ -20,7 +24,11 @@
 #define CRUSH_MAGIC 0x00010000ul   /* for detecting algorithm revisions */
 
 #define CRUSH_MAX_DEPTH 10  /* max crush hierarchy depth */
+#define CRUSH_MAX_RULESET (1<<8)  /* max crush ruleset number */
+#define CRUSH_MAX_RULES CRUSH_MAX_RULESET  /* should be the same as max rulesets */
 
+#define CRUSH_MAX_DEVICE_WEIGHT (100u * 0x10000u)
+#define CRUSH_MAX_BUCKET_WEIGHT (65535u * 0x10000u)
 
 #define CRUSH_ITEM_UNDEF  0x7ffffffe  /* undefined result (internal use only) */
 #define CRUSH_ITEM_NONE   0x7fffffff  /* no result */
@@ -108,6 +116,15 @@ enum {
 };
 extern const char *crush_bucket_alg_name(int alg);
 
+/*
+ * although tree was a legacy algorithm, it has been buggy, so
+ * exclude it.
+ */
+#define CRUSH_LEGACY_ALLOWED_BUCKET_ALGS (	\
+		(1 << CRUSH_BUCKET_UNIFORM) |	\
+		(1 << CRUSH_BUCKET_LIST) |	\
+		(1 << CRUSH_BUCKET_STRAW))
+
 struct crush_bucket {
 	__s32 id;        /* this'll be negative */
 	__u16 type;      /* non-zero; type=0 is reserved for devices */
@@ -174,7 +191,7 @@ struct crush_map {
 	/* choose local attempts using a fallback permutation before
 	 * re-descent */
 	__u32 choose_local_fallback_tries;
-	/* choose attempts before giving up */ 
+	/* choose attempts before giving up */
 	__u32 choose_total_tries;
 	/* attempt chooseleaf inner descent once for firstn mode; on
 	 * reject retry outer descent.  Note that this does *not*
@@ -187,6 +204,25 @@ struct crush_map {
 	 * that want to limit reshuffling, a value of 3 or 4 will make the
 	 * mappings line up a bit better with previous mappings. */
 	__u8 chooseleaf_vary_r;
+
+#ifndef __KERNEL__
+	/*
+	 * version 0 (original) of straw_calc has various flaws.  version 1
+	 * fixes a few of them.
+	 */
+	__u8 straw_calc_version;
+
+	/*
+	 * allowed bucket algs is a bitmask, here the bit positions
+	 * are CRUSH_BUCKET_*.  note that these are *bits* and
+	 * CRUSH_BUCKET_* values are not, so we need to or together (1
+	 * << CRUSH_BUCKET_WHATEVER).  The 0th bit is not used to
+	 * minimize confusion (bucket type values start at 1).
+	 */
+	__u32 allowed_bucket_algs;
+
+	__u32 *choose_tries;
+#endif
 };
 
 

include/linux/crush/hash.h

@@ -1,6 +1,12 @@
 #ifndef CEPH_CRUSH_HASH_H
 #define CEPH_CRUSH_HASH_H
 
+#ifdef __KERNEL__
+# include <linux/types.h>
+#else
+# include "crush_compat.h"
+#endif
+
 #define CRUSH_HASH_RJENKINS1   0
 
 #define CRUSH_HASH_DEFAULT CRUSH_HASH_RJENKINS1

include/linux/crush/mapper.h

@@ -8,7 +8,7 @@
  * LGPL2
  */
 
-#include <linux/crush/crush.h>
+#include "crush.h"
 
 extern int crush_find_rule(const struct crush_map *map, int ruleset, int type, int size);
 extern int crush_do_rule(const struct crush_map *map,