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From aecaffc55dd763c34f61937b2047f0aaaeb4e6fc Mon Sep 17 00:00:00 2001
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From: Karel Zak <kzak@redhat.com>
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Date: Thu, 6 Aug 2020 11:32:33 +0200
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Subject: [PATCH 66/74] libfdisk: fix fdisk_reread_changes() for extended
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partitions
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Linux kernel assumes only 1KiB extended partition to avoid overlapping
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with nested logical partitions. We need to follow this rule for
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BLKPG_ADD_PARTITION.
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Addresses: https://github.com/karelzak/util-linux/issues/1112
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=2041498
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Upstream: http://github.com/util-linux/util-linux/commit/33f50706fd7c1c5e53f8f355f12b685c6935f5a4
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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libfdisk/src/context.c | 13 ++++++++++++-
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1 file changed, 12 insertions(+), 1 deletion(-)
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diff --git a/libfdisk/src/context.c b/libfdisk/src/context.c
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index fe7eb9e7e..114101980 100644
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--- a/libfdisk/src/context.c
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+++ b/libfdisk/src/context.c
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@@ -867,10 +867,21 @@ int fdisk_reread_changes(struct fdisk_context *cxt, struct fdisk_table *org)
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}
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}
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for (i = 0; i < nadds; i++) {
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+ uint64_t sz;
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+
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pa = add[i];
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+ sz = pa->size * ssf;
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+
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DBG(PART, ul_debugobj(pa, "#%zu calling BLKPG_ADD_PARTITION", pa->partno));
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+
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+ if (fdisk_is_label(cxt, DOS) && fdisk_partition_is_container(pa))
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+ /* Let's follow the Linux kernel and reduce
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+ * DOS extended partition to 1 or 2 sectors.
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+ */
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+ sz = min(sz, (uint64_t) 2);
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+
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if (partx_add_partition(cxt->dev_fd, pa->partno + 1,
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- pa->start * ssf, pa->size * ssf) != 0) {
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+ pa->start * ssf, sz) != 0) {
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fdisk_warn(cxt, _("Failed to add partition %zu to system"), pa->partno + 1);
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err++;
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}
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--
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2.31.1
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