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From 4e646fa490ba4b782afa188dd8818b94c419924e Mon Sep 17 00:00:00 2001
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From: Dan Williams <dan.j.williams@intel.com>
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Date: Wed, 26 May 2021 16:33:10 -0700
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Subject: [PATCH 026/217] ndctl/scrub: Reread scrub-engine status at start
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Given that the kernel has exponential backoff to cover the lack of
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interrupts for scrub completion status there is a reasonable likelihood
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that 'ndctl start-scrub' is issued while the hardware/platform scrub-state
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is idle, but the kernel engine poll timer has not fired.
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Trigger at least one poll cycle for the kernel to re-read the scrub-state
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before reporting that ARS is busy.
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Link: https://lore.kernel.org/r/162207199057.3715490.2469820075085914776.stgit@dwillia2-desk3.amr.corp.intel.com
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Reported-by: Krzysztof Rusocki <krzysztof.rusocki@intel.com>
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Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
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---
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ndctl/lib/libndctl.c | 12 +++++++++++-
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1 file changed, 11 insertions(+), 1 deletion(-)
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diff --git a/ndctl/lib/libndctl.c b/ndctl/lib/libndctl.c
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index e5641fe..536e142 100644
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--- a/ndctl/lib/libndctl.c
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+++ b/ndctl/lib/libndctl.c
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@@ -1354,8 +1354,18 @@ static int __ndctl_bus_get_scrub_state(struct ndctl_bus *bus,
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NDCTL_EXPORT int ndctl_bus_start_scrub(struct ndctl_bus *bus)
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{
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struct ndctl_ctx *ctx = ndctl_bus_get_ctx(bus);
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+ int rc;
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+
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+ rc = sysfs_write_attr(ctx, bus->scrub_path, "1\n");
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- return sysfs_write_attr(ctx, bus->scrub_path, "1\n");
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+ /*
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+ * Try at least 1 poll cycle before reporting busy in case this
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+ * request hits the kernel's exponential backoff while the
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+ * hardware/platform scrub state is idle.
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+ */
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+ if (rc == -EBUSY && ndctl_bus_poll_scrub_completion(bus, 1, 1) == 0)
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+ return sysfs_write_attr(ctx, bus->scrub_path, "1\n");
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+ return rc;
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}
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NDCTL_EXPORT int ndctl_bus_get_scrub_state(struct ndctl_bus *bus)
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--
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2.27.0
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