Attachment 293927 Details for Bug 250104 – Patch 2 for blktap statistics

[patch] Patch 2 for blktap statistics

linux-2.6.18-xen-blktap-stats-12334-2.patch (text/plain), 1.75 KB, created by Chris Lalancette on 2008-02-04 20:00:32 UTC

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Creator: Chris Lalancette

Created: 2008-02-04 20:00:32 UTC

Size: 1.75 KB

patch

obsolete

>diff -urp linux-2.6.18.noarch.15402/include/xen/interface/io/blkif.h linux-2.6.18.noarch.12334/include/xen/interface/io/blkif.h
>--- linux-2.6.18.noarch.15402/include/xen/interface/io/blkif.h	2008-02-04 11:18:10.000000000 -0500
>+++ linux-2.6.18.noarch.12334/include/xen/interface/io/blkif.h	2008-02-04 14:35:57.000000000 -0500
>@@ -29,8 +29,22 @@
> #endif
> #define blkif_sector_t uint64_t
> 
>-#define BLKIF_OP_READ      0
>-#define BLKIF_OP_WRITE     1
>+/*
>+ * REQUEST CODES.
>+ */
>+#define BLKIF_OP_READ              0
>+#define BLKIF_OP_WRITE             1
>+/*
>+ * Recognised only if "feature-barrier" is present in backend xenbus info.
>+ * The "feature_barrier" node contains a boolean indicating whether barrier
>+ * requests are likely to succeed or fail. Either way, a barrier request
>+ * may fail at any time with BLKIF_RSP_EOPNOTSUPP if it is unsupported by
>+ * the underlying block-device hardware. The boolean simply indicates whether
>+ * or not it is worthwhile for the frontend to attempt barrier requests.
>+ * If a backend does not recognise BLKIF_OP_WRITE_BARRIER, it should *not*
>+ * create the "feature-barrier" node!
>+ */
>+#define BLKIF_OP_WRITE_BARRIER     2
> 
> /*
>  * Maximum scatter/gather segments per request.
>@@ -63,8 +77,15 @@ struct blkif_response {
> };
> typedef struct blkif_response blkif_response_t;
> 
>-#define BLKIF_RSP_ERROR  -1 /* non-specific 'error' */
>-#define BLKIF_RSP_OKAY    0 /* non-specific 'okay'  */
>+/*
>+ * STATUS RETURN CODES.
>+ */
>+ /* Operation not supported (only happens on barrier writes). */
>+#define BLKIF_RSP_EOPNOTSUPP  -2
>+ /* Operation failed for some unspecified reason (-EIO). */
>+#define BLKIF_RSP_ERROR       -1
>+ /* Operation completed successfully. */
>+#define BLKIF_RSP_OKAY         0
> 
> /*
>  * Generate blkif ring structures and types.

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Attachments on bug 250104: 293926 | 293927 | 293928 | 293929 | 293930 | 293931 | 293932 | 293933 | 293934 | 312441 | 312442 | 312443 | 312444 | 312445 | 312446 | 312447