LU-822 osd: use bitmask to calculate seq hash

[fs/lustre-release.git] / lustre / osd-ldiskfs / osd_internal.h

diff --git a/lustre/osd-ldiskfs/osd_internal.h b/lustre/osd-ldiskfs/osd_internal.h
index 37fae5a..abb5c49 100644 (file)
--- a/lustre/osd-ldiskfs/osd_internal.h
+++ b/lustre/osd-ldiskfs/osd_internal.h
@@ -155,14 +155,15 @@ struct osd_device {
         struct dt_device          od_dt_dev;
         /* information about underlying file system */
         struct lustre_mount_info *od_mount;
-        /* object index */
-        struct osd_oi             od_oi;
         /*
          * XXX temporary stuff for object index: directory where every object
          * is named by its fid.
          */
         struct dt_object         *od_obj_area;
-
+        /* object index */
+        struct osd_oi            *od_oi_table;
+        /* total number of OI containers */
+        int                       od_oi_count;
         /*
          * Fid Capability
          */
@@ -394,5 +395,17 @@ static inline int osd_fid_is_igif(const struct lu_fid *fid)
         return fid_is_igif(fid) || osd_fid_is_root(fid);
 }
 
+static inline struct osd_oi *
+osd_fid2oi(struct osd_device *osd, const struct lu_fid *fid)
+{
+        if (!fid_is_norm(fid))
+                return NULL;
+
+        LASSERT(osd->od_oi_table != NULL && osd->od_oi_count >= 1);
+        /* It can work even od_oi_count equals to 1 although it's unexpected,
+         * the only reason we set it to 1 is for performance measurement */
+        return &osd->od_oi_table[fid->f_seq & (osd->od_oi_count - 1)];
+}
+
 #endif /* __KERNEL__ */
 #endif /* _OSD_INTERNAL_H */