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54 lines
1.8 KiB
Diff
54 lines
1.8 KiB
Diff
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From 03cb793b26834ddca170ba87057c8f883772dd45 Mon Sep 17 00:00:00 2001
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From: Christian Marangi <ansuelsmth@gmail.com>
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Date: Thu, 3 Oct 2024 00:11:41 +0200
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Subject: [PATCH 1/5] block: add support for defining read-only partitions
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Add support for defining read-only partitions and complete support for
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it in the cmdline partition parser as the additional "ro" after a
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partition is scanned but never actually applied.
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Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
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Reviewed-by: Christoph Hellwig <hch@lst.de>
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Link: https://lore.kernel.org/r/20241002221306.4403-2-ansuelsmth@gmail.com
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Signed-off-by: Jens Axboe <axboe@kernel.dk>
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---
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block/blk.h | 1 +
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block/partitions/cmdline.c | 3 +++
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block/partitions/core.c | 3 +++
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3 files changed, 7 insertions(+)
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--- a/block/blk.h
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+++ b/block/blk.h
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@@ -424,6 +424,7 @@ void blk_free_ext_minor(unsigned int min
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#define ADDPART_FLAG_NONE 0
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#define ADDPART_FLAG_RAID 1
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#define ADDPART_FLAG_WHOLEDISK 2
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+#define ADDPART_FLAG_READONLY 4
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int bdev_add_partition(struct gendisk *disk, int partno, sector_t start,
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sector_t length);
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int bdev_del_partition(struct gendisk *disk, int partno);
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--- a/block/partitions/cmdline.c
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+++ b/block/partitions/cmdline.c
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@@ -237,6 +237,9 @@ static int add_part(int slot, struct cmd
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put_partition(state, slot, subpart->from >> 9,
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subpart->size >> 9);
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+ if (subpart->flags & PF_RDONLY)
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+ state->parts[slot].flags |= ADDPART_FLAG_READONLY;
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+
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info = &state->parts[slot].info;
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strscpy(info->volname, subpart->name, sizeof(info->volname));
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--- a/block/partitions/core.c
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+++ b/block/partitions/core.c
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@@ -392,6 +392,9 @@ static struct block_device *add_partitio
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goto out_del;
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}
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+ if (flags & ADDPART_FLAG_READONLY)
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+ bdev->bd_read_only = true;
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+
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/* everything is up and running, commence */
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err = xa_insert(&disk->part_tbl, partno, bdev, GFP_KERNEL);
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if (err)
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