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block: add support for defining read-only partitions

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Add support for defining read-only partitions and complete support for
it in the cmdline partition parser as the additional "ro" after a
partition is scanned but never actually applied.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20241002221306.4403-2-ansuelsmth@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christian Marangi 2024-10-03 00:11:41 +02:00 committed by Jens Axboe
parent e3569ecae4
commit ba40f4c590
3 changed files with 7 additions and 0 deletions
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1
block/blk.h
View File

@ -547,6 +547,7 @@ void blk_free_ext_minor(unsigned int minor);
#define ADDPART_FLAG_NONE 0
#define ADDPART_FLAG_RAID 1
#define ADDPART_FLAG_WHOLEDISK 2
#define ADDPART_FLAG_READONLY 4
int bdev_add_partition(struct gendisk *disk, int partno, sector_t start,
sector_t length);
int bdev_del_partition(struct gendisk *disk, int partno);

3
block/partitions/cmdline.c
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@ -237,6 +237,9 @@ static int add_part(int slot, struct cmdline_subpart *subpart,
put_partition(state, slot, subpart->from >> 9,
subpart->size >> 9);
if (subpart->flags & PF_RDONLY)
state->parts[slot].flags |= ADDPART_FLAG_READONLY;
info = &state->parts[slot].info;
strscpy(info->volname, subpart->name, sizeof(info->volname));

3
block/partitions/core.c
View File

@ -373,6 +373,9 @@ static struct block_device *add_partition(struct gendisk *disk, int partno,
goto out_del;
}
if (flags & ADDPART_FLAG_READONLY)
bdev_set_flag(bdev, BD_READ_ONLY);
/* everything is up and running, commence */
err = xa_insert(&disk->part_tbl, partno, bdev, GFP_KERNEL);
if (err)