Illumos 5987 - zfs prefetch code needs work

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

diff --git a/include/sys/arc.h b/include/sys/arc.h
index db7a64aa2e22e43d7adccd3900e7e53abe51a6a3..5780554b5c2224dc6aa1fe6f7a4cdd21d5bef88e 100644 (file)
--- a/include/sys/arc.h
+++ b/include/sys/arc.h
@@ -84,27 +84,31 @@ typedef enum arc_flags
        ARC_FLAG_CACHED                 = 1 << 4,       /* I/O was in cache */
        ARC_FLAG_L2CACHE                = 1 << 5,       /* cache in L2ARC */
        ARC_FLAG_L2COMPRESS             = 1 << 6,       /* compress in L2ARC */
+       ARC_FLAG_PREDICTIVE_PREFETCH    = 1 << 7,       /* I/O from zfetch */
 
        /*
         * Private ARC flags.  These flags are private ARC only flags that
         * will show up in b_flags in the arc_hdr_buf_t. These flags should
         * only be set by ARC code.
         */
-       ARC_FLAG_IN_HASH_TABLE          = 1 << 7,       /* buffer is hashed */
-       ARC_FLAG_IO_IN_PROGRESS         = 1 << 8,       /* I/O in progress */
-       ARC_FLAG_IO_ERROR               = 1 << 9,       /* I/O failed for buf */
-       ARC_FLAG_FREED_IN_READ          = 1 << 10,      /* freed during read */
-       ARC_FLAG_BUF_AVAILABLE          = 1 << 11,      /* block not in use */
-       ARC_FLAG_INDIRECT               = 1 << 12,      /* indirect block */
-       ARC_FLAG_L2_WRITING             = 1 << 13,      /* write in progress */
-       ARC_FLAG_L2_EVICTED             = 1 << 14,      /* evicted during I/O */
-       ARC_FLAG_L2_WRITE_HEAD          = 1 << 15,      /* head of write list */
+       ARC_FLAG_IN_HASH_TABLE          = 1 << 8,       /* buffer is hashed */
+       ARC_FLAG_IO_IN_PROGRESS         = 1 << 9,       /* I/O in progress */
+       ARC_FLAG_IO_ERROR               = 1 << 10,      /* I/O failed for buf */
+       ARC_FLAG_FREED_IN_READ          = 1 << 11,      /* freed during read */
+       ARC_FLAG_BUF_AVAILABLE          = 1 << 12,      /* block not in use */
+       ARC_FLAG_INDIRECT               = 1 << 13,      /* indirect block */
+       /* Indicates that block was read with ASYNC priority. */
+       ARC_FLAG_PRIO_ASYNC_READ        = 1 << 14,
+       ARC_FLAG_L2_WRITING             = 1 << 15,      /* write in progress */
+       ARC_FLAG_L2_EVICTED             = 1 << 16,      /* evicted during I/O */
+       ARC_FLAG_L2_WRITE_HEAD          = 1 << 17,      /* head of write list */
        /* indicates that the buffer contains metadata (otherwise, data) */
-       ARC_FLAG_BUFC_METADATA          = 1 << 16,
+       ARC_FLAG_BUFC_METADATA          = 1 << 18,
 
        /* Flags specifying whether optional hdr struct fields are defined */
-       ARC_FLAG_HAS_L1HDR              = 1 << 17,
-       ARC_FLAG_HAS_L2HDR              = 1 << 18,
+       ARC_FLAG_HAS_L1HDR              = 1 << 19,
+       ARC_FLAG_HAS_L2HDR              = 1 << 20,
+
 } arc_flags_t;
 
 struct arc_buf {