git.openwrt.org Git - openwrt/staging/wigyori.git/blob

   1 From 03cb793b26834ddca170ba87057c8f883772dd45 Mon Sep 17 00:00:00 2001
   2 From: Christian Marangi <ansuelsmth@gmail.com>
   3 Date: Thu, 3 Oct 2024 00:11:41 +0200
   4 Subject: [PATCH 1/5] block: add support for defining read-only partitions
   5
   6 Add support for defining read-only partitions and complete support for
   7 it in the cmdline partition parser as the additional "ro" after a
   8 partition is scanned but never actually applied.
   9
  10 Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
  11 Reviewed-by: Christoph Hellwig <hch@lst.de>
  12 Link: https://lore.kernel.org/r/20241002221306.4403-2-ansuelsmth@gmail.com
  13 Signed-off-by: Jens Axboe <axboe@kernel.dk>
  14 ---
  15  block/blk.h                | 1 +
  16  block/partitions/cmdline.c | 3 +++
  17  block/partitions/core.c    | 3 +++
  18  3 files changed, 7 insertions(+)
  19
  20 --- a/block/blk.h
  21 +++ b/block/blk.h
  22 @@ -424,6 +424,7 @@ void blk_free_ext_minor(unsigned int min
  23  #define ADDPART_FLAG_NONE      0
  24  #define ADDPART_FLAG_RAID      1
  25  #define ADDPART_FLAG_WHOLEDISK 2
  26 +#define ADDPART_FLAG_READONLY  4
  27  int bdev_add_partition(struct gendisk *disk, int partno, sector_t start,
  28                 sector_t length);
  29  int bdev_del_partition(struct gendisk *disk, int partno);
  30 --- a/block/partitions/cmdline.c
  31 +++ b/block/partitions/cmdline.c
  32 @@ -237,6 +237,9 @@ static int add_part(int slot, struct cmd
  33         put_partition(state, slot, subpart->from >> 9,
  34                       subpart->size >> 9);
  35
  36 +       if (subpart->flags & PF_RDONLY)
  37 +               state->parts[slot].flags |= ADDPART_FLAG_READONLY;
  38 +
  39         info = &state->parts[slot].info;
  40
  41         strscpy(info->volname, subpart->name, sizeof(info->volname));
  42 --- a/block/partitions/core.c
  43 +++ b/block/partitions/core.c
  44 @@ -392,6 +392,9 @@ static struct block_device *add_partitio
  45                         goto out_del;
  46         }
  47
  48 +       if (flags & ADDPART_FLAG_READONLY)
  49 +               bdev->bd_read_only = true;
  50 +
  51         /* everything is up and running, commence */
  52         err = xa_insert(&disk->part_tbl, partno, bdev, GFP_KERNEL);
  53         if (err)