50 lines
1.6 KiB
Diff
50 lines
1.6 KiB
Diff
From 19cb7d4e4efe39ef6ec8b216a254d83a1257846c 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 9f42526..85b71f5 100644
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--- a/block/genhd.c
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+++ b/block/genhd.c
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@@ -572,6 +572,15 @@ exit:
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disk_part_iter_exit(&piter);
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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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* add_disk - add partitioning information to kernel list
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* @disk: per-device partitioning information
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@@ -587,6 +596,9 @@ void add_disk(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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2.5.5
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