LU-3345 llapi: add user space method for lov_user_md

[fs/lustre-release.git] / lustre / include / obd_lov.h

diff --git a/lustre/include/obd_lov.h b/lustre/include/obd_lov.h
index b05ca09..dfb2631 100644 (file)
--- a/lustre/include/obd_lov.h
+++ b/lustre/include/obd_lov.h
@@ -27,7 +27,7 @@
  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  *
- * Copyright (c) 2012, Whamcloud, Inc.
+ * Copyright (c) 2012, Intel Corporation.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
@@ -37,21 +37,13 @@
 #ifndef _OBD_LOV_H__
 #define _OBD_LOV_H__
 
+#define LOV_DEFAULT_STRIPE_SIZE (1 << LNET_MTU_BITS)
+
 static inline int lov_stripe_md_size(__u16 stripes)
 {
         return sizeof(struct lov_stripe_md) + stripes*sizeof(struct lov_oinfo*);
 }
 
-static inline __u32 lov_mds_md_size(__u16 stripes, __u32 lmm_magic)
-{
-        if (lmm_magic == LOV_MAGIC_V3)
-                return sizeof(struct lov_mds_md_v3) +
-                        stripes * sizeof(struct lov_ost_data_v1);
-        else
-                return sizeof(struct lov_mds_md_v1) +
-                        stripes * sizeof(struct lov_ost_data_v1);
-}
-
 struct lov_version_size {
         __u32   lvs_magic;
         size_t  lvs_lmm_size;
@@ -82,6 +74,37 @@ static inline __u32 lov_mds_md_stripecnt(int ea_size, __u32 lmm_magic)
         return 0;
 }
 
+/* lov_do_div64(a, b) returns a % b, and a = a / b.
+ * The 32-bit code is LOV-specific due to knowing about stripe limits in
+ * order to reduce the divisor to a 32-bit number.  If the divisor is
+ * already a 32-bit value the compiler handles this directly. */
+#if BITS_PER_LONG > 32
+# define lov_do_div64(n,base) ({                                       \
+       uint64_t __base = (base);                                       \
+       uint64_t __rem;                                                 \
+       __rem = ((uint64_t)(n)) % __base;                               \
+       (n) = ((uint64_t)(n)) / __base;                                 \
+       __rem;                                                          \
+  })
+#else
+# define lov_do_div64(n,base) ({                                       \
+       uint64_t __rem;                                                 \
+       if ((sizeof(base) > 4) && (((base) & 0xffffffff00000000ULL) != 0)) {  \
+               int __remainder;                                              \
+               LASSERTF(!((base) & (LOV_MIN_STRIPE_SIZE - 1)), "64 bit lov " \
+                        "division %llu / %llu\n", (n), (uint64_t)(base));    \
+               __remainder = (n) & (LOV_MIN_STRIPE_SIZE - 1);          \
+               (n) >>= LOV_MIN_STRIPE_BITS;                            \
+               __rem = do_div(n, (base) >> LOV_MIN_STRIPE_BITS);       \
+               __rem <<= LOV_MIN_STRIPE_BITS;                          \
+               __rem += __remainder;                                   \
+       } else {                                                        \
+               __rem = do_div(n, base);                                \
+       }                                                               \
+       __rem;                                                          \
+  })
+#endif
+
 #define IOC_LOV_TYPE                   'g'
 #define IOC_LOV_MIN_NR                 50
 #define IOC_LOV_SET_OSC_ACTIVE         _IOWR('g', 50, long)