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From: Dmitry Osipenko <digetx@gmail.com>
To: "Jens Axboe" <axboe@kernel.dk>,
	"Thierry Reding" <thierry.reding@gmail.com>,
	"Jonathan Hunter" <jonathanh@nvidia.com>,
	"Michał Mirosław" <mirq-linux@rere.qmqm.pl>,
	"David Heidelberg" <david@ixit.cz>,
	"Peter Geis" <pgwipeout@gmail.com>,
	"Ulf Hansson" <ulf.hansson@linaro.org>,
	"Adrian Hunter" <adrian.hunter@intel.com>,
	"Christoph Hellwig" <hch@infradead.org>,
	"Davidlohr Bueso" <dave@stgolabs.net>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Ion Agorria" <AG0RRIA@yahoo.com>,
	"Svyatoslav Ryhel" <clamor95@gmail.com>
Cc: linux-tegra@vger.kernel.org, linux-block@vger.kernel.org,
	linux-efi <linux-efi@vger.kernel.org>
Subject: [PATCH v7 2/4] partitions/efi: Support non-standard GPT location
Date: Fri, 20 Aug 2021 03:45:34 +0300	[thread overview]
Message-ID: <20210820004536.15791-3-digetx@gmail.com> (raw)
In-Reply-To: <20210820004536.15791-1-digetx@gmail.com>

Support looking up GPT at a non-standard location specified by a block
device driver.

Acked-by: Davidlohr Bueso <dbueso@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 block/partitions/efi.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/block/partitions/efi.c b/block/partitions/efi.c
index aaa3dc487cb5..7ca5c4c374d4 100644
--- a/block/partitions/efi.c
+++ b/block/partitions/efi.c
@@ -585,6 +585,8 @@ static int find_valid_gpt(struct parsed_partitions *state, gpt_header **gpt,
 	gpt_header *pgpt = NULL, *agpt = NULL;
 	gpt_entry *pptes = NULL, *aptes = NULL;
 	legacy_mbr *legacymbr;
+	struct gendisk *disk = state->disk;
+	const struct block_device_operations *fops = disk->fops;
 	sector_t total_sectors = get_capacity(state->disk);
 	u64 lastlba;
 
@@ -619,6 +621,16 @@ static int find_valid_gpt(struct parsed_partitions *state, gpt_header **gpt,
         if (!good_agpt && force_gpt)
                 good_agpt = is_gpt_valid(state, lastlba, &agpt, &aptes);
 
+	if (!good_agpt && force_gpt && fops->alternative_gpt_sector) {
+		sector_t agpt_sector;
+		int err;
+
+		err = fops->alternative_gpt_sector(disk, &agpt_sector);
+		if (!err)
+			good_agpt = is_gpt_valid(state, agpt_sector,
+						 &agpt, &aptes);
+	}
+
         /* The obviously unsuccessful case */
         if (!good_pgpt && !good_agpt)
                 goto fail;
-- 
2.32.0


  parent reply	other threads:[~2021-08-20  0:45 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-20  0:45 [PATCH v7 0/4] Support EFI partition on NVIDIA Tegra devices Dmitry Osipenko
2021-08-20  0:45 ` [PATCH v7 1/4] block: Add alternative_gpt_sector() operation Dmitry Osipenko
2021-08-20  0:45 ` Dmitry Osipenko [this message]
2021-08-20  0:45 ` [PATCH v7 3/4] mmc: block: Support " Dmitry Osipenko
2021-08-20  0:45 ` [PATCH v7 4/4] mmc: sdhci-tegra: Enable MMC_CAP2_ALT_GPT_TEGRA Dmitry Osipenko
2021-08-20 11:27   ` Thierry Reding
2021-08-24  8:48 ` [PATCH v7 0/4] Support EFI partition on NVIDIA Tegra devices Ulf Hansson
2021-08-24 16:09   ` Jens Axboe

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