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From 8186ec87dcd1b347ab0ee27ec5e87bda8c9a67e2 Mon Sep 17 00:00:00 2001
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From: Dan Williams <dan.j.williams@intel.com>
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Date: Thu, 28 Apr 2022 16:54:48 -0700
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Subject: [PATCH 170/217] ndctl/dimm: Flush invalidated labels after overwrite
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Similar to "ndctl write-labels", after "ndctl sanitize-dimm --overwrite"
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the kernel may contain a cached copy of the label area that has been
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invalidated by the overwrite. Toggle the enabled state of the dimm-device
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to trigger the kernel to release the cached copy.
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Link: https://lore.kernel.org/all/165118817010.1772793.5101398830527716084.stgit@dwillia2-desk3.amr.corp.intel.com/
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Link: https://lore.kernel.org/r/165119008839.1783158.3766085644383173318.stgit@dwillia2-desk3.amr.corp.intel.com
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Cc: Jeff Moyer <jmoyer@redhat.com>
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Cc: Dave Jiang <dave.jiang@intel.com>
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Acked-by: Jeff Moyer <jmoyer@redhat.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/dimm.c | 34 ++++++++++++++++++++++------------
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1 file changed, 22 insertions(+), 12 deletions(-)
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diff --git a/ndctl/dimm.c b/ndctl/dimm.c
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index d9718a3..ac7c527 100644
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--- a/ndctl/dimm.c
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+++ b/ndctl/dimm.c
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@@ -354,6 +354,23 @@ static int rw_bin(FILE *f, struct ndctl_cmd *cmd, ssize_t size,
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return 0;
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}
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+static int revalidate_labels(struct ndctl_dimm *dimm)
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+{
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+ int rc;
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+
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+ /*
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+ * If the dimm is already disabled the kernel is not holding a cached
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+ * copy of the label space.
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+ */
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+ if (!ndctl_dimm_is_enabled(dimm))
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+ return 0;
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+
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+ rc = ndctl_dimm_disable(dimm);
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+ if (rc)
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+ return rc;
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+ return ndctl_dimm_enable(dimm);
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+}
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+
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static int action_write(struct ndctl_dimm *dimm, struct action_context *actx)
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{
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struct ndctl_cmd *cmd_read, *cmd_write;
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@@ -377,18 +394,10 @@ static int action_write(struct ndctl_dimm *dimm, struct action_context *actx)
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size = ndctl_cmd_cfg_read_get_size(cmd_read);
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rc = rw_bin(actx->f_in, cmd_write, size, param.offset, WRITE);
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-
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- /*
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- * If the dimm is already disabled the kernel is not holding a cached
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- * copy of the label space.
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- */
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- if (!ndctl_dimm_is_enabled(dimm))
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- goto out;
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-
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- rc = ndctl_dimm_disable(dimm);
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if (rc)
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goto out;
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- rc = ndctl_dimm_enable(dimm);
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+
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+ rc = revalidate_labels(dimm);
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out:
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ndctl_cmd_unref(cmd_read);
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@@ -1043,7 +1052,7 @@ static int action_security_freeze(struct ndctl_dimm *dimm,
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static int action_sanitize_dimm(struct ndctl_dimm *dimm,
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struct action_context *actx)
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{
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- int rc;
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+ int rc = 0;
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enum ndctl_key_type key_type;
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if (ndctl_dimm_get_security(dimm) < 0) {
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@@ -1085,9 +1094,10 @@ static int action_sanitize_dimm(struct ndctl_dimm *dimm,
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rc = ndctl_dimm_overwrite_key(dimm);
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if (rc < 0)
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return rc;
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+ rc = revalidate_labels(dimm);
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}
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- return 0;
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+ return rc;
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}
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static int action_wait_overwrite(struct ndctl_dimm *dimm,
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--
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2.27.0
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