Date: Sun, 16 Feb 2014 19:46:20 +0000 (UTC) From: Marcel Moolenaar <marcel@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r261993 - stable/10/sys/geom/part Message-ID: <201402161946.s1GJkKqn009650@svn.freebsd.org>
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Author: marcel Date: Sun Feb 16 19:46:20 2014 New Revision: 261993 URL: http://svnweb.freebsd.org/changeset/base/261993 Log: MFC r258448: Have the GPT probe return a lower priority when the MBR is not a PMBR. Modified: stable/10/sys/geom/part/g_part_gpt.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/geom/part/g_part_gpt.c ============================================================================== --- stable/10/sys/geom/part/g_part_gpt.c Sun Feb 16 19:44:30 2014 (r261992) +++ stable/10/sys/geom/part/g_part_gpt.c Sun Feb 16 19:46:20 2014 (r261993) @@ -758,8 +758,8 @@ static int g_part_gpt_probe(struct g_part_table *table, struct g_consumer *cp) { struct g_provider *pp; - char *buf; - int error, res; + u_char *buf; + int error, index, pri, res; /* We don't nest, which means that our depth should be 0. */ if (table->gpt_depth != 0) @@ -784,11 +784,21 @@ g_part_gpt_probe(struct g_part_table *ta if (pp->sectorsize < MBRSIZE || pp->mediasize < 6 * pp->sectorsize) return (ENOSPC); - /* Check that there's a MBR. */ + /* + * Check that there's a MBR or a PMBR. If it's a PMBR, we return + * as the highest priority on a match, otherwise we assume some + * GPT-unaware tool has destroyed the GPT by recreating a MBR and + * we really want the MBR scheme to take precedence. + */ buf = g_read_data(cp, 0L, pp->sectorsize, &error); if (buf == NULL) return (error); res = le16dec(buf + DOSMAGICOFFSET); + pri = G_PART_PROBE_PRI_LOW; + for (index = 0; index < NDOSPART; index++) { + if (buf[DOSPARTOFF + DOSPARTSIZE * index + 4] == 0xee) + pri = G_PART_PROBE_PRI_HIGH; + } g_free(buf); if (res != DOSMAGIC) return (ENXIO); @@ -800,7 +810,7 @@ g_part_gpt_probe(struct g_part_table *ta res = memcmp(buf, GPT_HDR_SIG, 8); g_free(buf); if (res == 0) - return (G_PART_PROBE_PRI_HIGH); + return (pri); /* No primary? Check that there's a secondary. */ buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, @@ -809,7 +819,7 @@ g_part_gpt_probe(struct g_part_table *ta return (error); res = memcmp(buf, GPT_HDR_SIG, 8); g_free(buf); - return ((res == 0) ? G_PART_PROBE_PRI_HIGH : ENXIO); + return ((res == 0) ? pri : ENXIO); } static int
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