Speculative prefetch for reordered requests

[mirror_zfs.git] / include / sys / dmu_zfetch.h

diff --git a/include/sys/dmu_zfetch.h b/include/sys/dmu_zfetch.h
index f00e13cf03a659e68b2664f418f1db5c8ea880ea..322472fb1ae25af96aee3cbf409f6b0dd9106459 100644 (file)
--- a/include/sys/dmu_zfetch.h
+++ b/include/sys/dmu_zfetch.h
@@ -45,18 +45,24 @@ typedef struct zfetch {
        int             zf_numstreams;  /* number of zstream_t's */
 } zfetch_t;
 
+typedef struct zsrange {
+       uint16_t        start;
+       uint16_t        end;
+} zsrange_t;
+
+#define        ZFETCH_RANGES   9               /* Fits zstream_t into 128 bytes */
+
 typedef struct zstream {
+       list_node_t     zs_node;        /* link for zf_stream */
        uint64_t        zs_blkid;       /* expect next access at this blkid */
+       uint_t          zs_atime;       /* time last prefetch issued */
+       zsrange_t       zs_ranges[ZFETCH_RANGES]; /* ranges from future */
        unsigned int    zs_pf_dist;     /* data prefetch distance in bytes */
        unsigned int    zs_ipf_dist;    /* L1 prefetch distance in bytes */
        uint64_t        zs_pf_start;    /* first data block to prefetch */
        uint64_t        zs_pf_end;      /* data block to prefetch up to */
        uint64_t        zs_ipf_start;   /* first data block to prefetch L1 */
        uint64_t        zs_ipf_end;     /* data block to prefetch L1 up to */
-
-       list_node_t     zs_node;        /* link for zf_stream */
-       hrtime_t        zs_atime;       /* time last prefetch issued */
-       zfetch_t        *zs_fetch;      /* parent fetch */
        boolean_t       zs_missed;      /* stream saw cache misses */
        boolean_t       zs_more;        /* need more distant prefetch */
        zfs_refcount_t  zs_callers;     /* number of pending callers */
@@ -74,7 +80,7 @@ void          dmu_zfetch_init(zfetch_t *, struct dnode *);
 void           dmu_zfetch_fini(zfetch_t *);
 zstream_t      *dmu_zfetch_prepare(zfetch_t *, uint64_t, uint64_t, boolean_t,
     boolean_t);
-void           dmu_zfetch_run(zstream_t *, boolean_t, boolean_t);
+void           dmu_zfetch_run(zfetch_t *, zstream_t *, boolean_t, boolean_t);
 void           dmu_zfetch(zfetch_t *, uint64_t, uint64_t, boolean_t, boolean_t,
     boolean_t);