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50 lines
1.7 KiB
50 lines
1.7 KiB
From 10a2635f42ee839b3ffa6d67f5ae622ca9a09f60 Mon Sep 17 00:00:00 2001
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From: Rusty Bird <rustybird@openmailbox.org>
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Date: Mon, 11 Jul 2016 13:05:38 +0000
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Subject: [PATCH] block: add no_part_scan module parameter
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Define a boolean module parameter named "no_part_scan" defaulting to N,
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which, if set to Y, always causes the GENHD_FL_NO_PART_SCAN flag to be
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added to subsequently created block devices, thereby disabling the
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kernel's various partition table parsers for them.
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The parameter's current value can be changed at any time by writing to
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the /sys/module/block/parameters/no_part_scan file.
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---
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block/genhd.c | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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diff --git a/block/genhd.c b/block/genhd.c
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index 24654e1d83e6..ce06da45aecd 100644
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--- a/block/genhd.c
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+++ b/block/genhd.c
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@@ -676,6 +676,15 @@ static void register_disk(struct device *parent, struct gendisk *disk,
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}
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}
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+/* copied (not moved) from far down below, to have fewer patch hunks */
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+#undef MODULE_PARAM_PREFIX
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+#define MODULE_PARAM_PREFIX "block."
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+
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+/* partition scanning policy */
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+static bool disk_no_part_scan = 0;
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+module_param_named(no_part_scan, disk_no_part_scan, bool, S_IRUGO|S_IWUSR);
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+MODULE_PARM_DESC(no_part_scan, "When adding block devices, always mark them as not to be scanned for partitions");
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+
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/**
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* __device_add_disk - add disk information to kernel list
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* @parent: parent device for the disk
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@@ -695,6 +704,9 @@ static void __device_add_disk(struct device *parent, struct gendisk *disk,
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dev_t devt;
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int retval;
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+ if (disk_no_part_scan)
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+ disk->flags |= GENHD_FL_NO_PART_SCAN;
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+
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/* minors == 0 indicates to use ext devt from part0 and should
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* be accompanied with EXT_DEVT flag. Make sure all
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* parameters make sense.
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--
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2.20.1
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