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@xxxxxxxxx> Reviewed-by: Christoph Hellwig <hch@xxxxxx> --- block/blk.h | 1 + block/partitions/cmdline.c | 3 +++ block/partitions/core.c | 3 +++ 3 files changed, 7 insertions(+) diff --git a/block/blk.h b/block/blk.h index c718e4291db0..f300212d3e98 100644 --- a/block/blk.h +++ b/block/blk.h @@ -558,6 +558,7 @@ 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); diff --git a/block/partitions/cmdline.c b/block/partitions/cmdline.c index 152c85df92b2..da3e719d8e51 100644 --- a/block/partitions/cmdline.c +++ b/block/partitions/cmdline.c @@ -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)); diff --git a/block/partitions/core.c b/block/partitions/core.c index ab76e64f0f6c..abad6c83db8f 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -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) -- 2.45.2
