On Sat, 27 Aug 2016 21:44:16 +0200
Daniel Golle <dan...@makrotopia.org> wrote:
> Define function ubiblock_create_dev(char *name, dev_t *bdev)
> which returns the created device by setting the point bdev.
> This is useful for in-kernel users creating a ubiblock device
> in order to mount the root filesystem.
No specific comment on this one either, since it's only preparing stuff
for the real changes done in patch 3.
>
> Signed-off-by: Daniel Golle <dan...@makrotopia.org>
> ---
> drivers/mtd/ubi/block.c | 11 ++++++++++-
> drivers/mtd/ubi/ubi.h | 2 ++
> include/linux/mtd/ubi.h | 16 ++++++++++++++++
> 3 files changed, 28 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
> index ebf46ad..58b818f 100644
> --- a/drivers/mtd/ubi/block.c
> +++ b/drivers/mtd/ubi/block.c
> @@ -49,6 +49,7 @@
> #include <linux/hdreg.h>
> #include <linux/scatterlist.h>
> #include <linux/idr.h>
> +#include <linux/kdev_t.h>
> #include <asm/div64.h>
>
> #include "ubi-media.h"
> @@ -356,7 +357,11 @@ static struct blk_mq_ops ubiblock_mq_ops = {
>
> static DEFINE_IDR(ubiblock_minor_idr);
>
> -int ubiblock_create(struct ubi_volume_info *vi)
> +int ubiblock_create(struct ubi_volume_info *vi) {
> + return ubiblock_create_dev(vi, NULL);
> +}
> +
> +int ubiblock_create_dev(struct ubi_volume_info *vi, dev_t *bdev)
> {
> struct ubiblock *dev;
> struct gendisk *gd;
> @@ -448,6 +453,10 @@ int ubiblock_create(struct ubi_volume_info *vi)
> add_disk(dev->gd);
> dev_info(disk_to_dev(dev->gd), "created from ubi%d:%d(%s)",
> dev->ubi_num, dev->vol_id, vi->name);
> +
> + if (bdev)
> + *bdev = MKDEV(gd->major, gd->first_minor);
> +
> return 0;
>
> out_free_queue:
> diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
> index de1ea2e4..7700752 100644
> --- a/drivers/mtd/ubi/ubi.h
> +++ b/drivers/mtd/ubi/ubi.h
> @@ -39,6 +39,7 @@
> #include <linux/notifier.h>
> #include <linux/mtd/mtd.h>
> #include <linux/mtd/ubi.h>
> +#include <linux/kdev_t.h>
> #include <asm/pgtable.h>
>
> #include "ubi-media.h"
> @@ -917,6 +918,7 @@ static inline int ubi_update_fastmap(struct ubi_device
> *ubi) { return 0; }
> int ubiblock_init(void);
> void ubiblock_exit(void);
> int ubiblock_create(struct ubi_volume_info *vi);
> +int ubiblock_create_dev(struct ubi_volume_info *vi, dev_t *bdev);
> int ubiblock_remove(struct ubi_volume_info *vi);
> #else
> static inline int ubiblock_init(void) { return 0; }
> diff --git a/include/linux/mtd/ubi.h b/include/linux/mtd/ubi.h
> index 0b92aa5..3d6444f 100644
> --- a/include/linux/mtd/ubi.h
> +++ b/include/linux/mtd/ubi.h
> @@ -21,7 +21,9 @@
> #ifndef __LINUX_UBI_H__
> #define __LINUX_UBI_H__
>
> +#include <linux/errno.h>
> #include <linux/ioctl.h>
> +#include <linux/kdev_t.h>
> #include <linux/types.h>
> #include <linux/scatterlist.h>
> #include <mtd/ubi-user.h>
> @@ -282,4 +284,18 @@ static inline int ubi_read_sg(struct ubi_volume_desc
> *desc, int lnum,
> {
> return ubi_leb_read_sg(desc, lnum, sgl, offset, len, 0);
> }
> +
> +
> +/*
> + * This function allows in-kernel users to create a ubiblock device and
> + * get to know about the created device.
> + */
> +#ifdef CONFIG_MTD_UBI_BLOCK
> +int ubiblock_create_dev(struct ubi_volume_info *vi, dev_t *bdev);
> +#else
> +int ubiblock_create_dev(struct ubi_volume_info *vi, dev_t *bdev) {
> + return -ENOTSUPP;
> +}
> +#endif
> +
> #endif /* !__LINUX_UBI_H__ */
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