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Commit 941dfb07 authored by Artem Bityutskiy's avatar Artem Bityutskiy
Browse files

UBI: set correct gluebi device size 



In case of static volumes, make emulated MTD device size to
be equivalent to data size, rather then volume size.

Reported-by: default avatarJohn Smith <john@arrows.demon.co.uk>
Signed-off-by: default avatarArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
parent 4ab60a0d

drivers/mtd/ubi/cdev.c

+1 −0
Original line number Diff line number Diff line
@@ -397,6 +397,7 @@ static ssize_t vol_cdev_write(struct file *file, const char __user *buf, 
			vol->corrupted = 1;

		}

		vol->checked = 1;

		ubi_gluebi_updated(vol);

		revoke_exclusive(desc, UBI_READWRITE);

	}

drivers/mtd/ubi/gluebi.c

+26 −1
Original line number Diff line number Diff line
@@ -282,7 +282,6 @@ int ubi_create_gluebi(struct ubi_device *ubi, struct ubi_volume *vol) 
		mtd->flags = MTD_WRITEABLE;

	mtd->writesize  = ubi->min_io_size;

	mtd->owner      = THIS_MODULE;

	mtd->size       = vol->usable_leb_size * vol->reserved_pebs;

	mtd->erasesize  = vol->usable_leb_size;

	mtd->read       = gluebi_read;

	mtd->write      = gluebi_write;
@@ -290,6 +289,15 @@ int ubi_create_gluebi(struct ubi_device *ubi, struct ubi_volume *vol) 
	mtd->get_device = gluebi_get_device;

	mtd->put_device = gluebi_put_device;



	/*

	 * In case of dynamic volume, MTD device size is just volume size. In

	 * case of a static volume the size is equivalent to the amount of data

	 * bytes, which is zero at this moment and will be changed after volume

	 * update.

	 */

	if (vol->vol_type == UBI_DYNAMIC_VOLUME)

		mtd->size = vol->usable_leb_size * vol->reserved_pebs;



	if (add_mtd_device(mtd)) {

		ubi_err("cannot not add MTD device\n");

		kfree(mtd->name);
@@ -321,3 +329,20 @@ int ubi_destroy_gluebi(struct ubi_volume *vol) 
	kfree(mtd->name);

	return 0;

}



/**

 * ubi_gluebi_updated - UBI volume was updated notifier.

 * @vol: volume description object

 *

 * This function is called every time an UBI volume is updated. This function

 * does nothing if volume @vol is dynamic, and changes MTD device size if the

 * volume is static. This is needed because static volumes cannot be read past

 * data they contain.

 */

void ubi_gluebi_updated(struct ubi_volume *vol)

{

	struct mtd_info *mtd = &vol->gluebi_mtd;



	if (vol->vol_type == UBI_STATIC_VOLUME)

		mtd->size = vol->used_bytes;

}

drivers/mtd/ubi/scan.c

+1 −1
Original line number Diff line number Diff line
@@ -55,7 +55,7 @@ static int paranoid_check_si(const struct ubi_device *ubi, 
static struct ubi_ec_hdr *ech;

static struct ubi_vid_hdr *vidh;



/*

/**

 * add_to_list - add physical eraseblock to a list.

 * @si: scanning information

 * @pnum: physical eraseblock number to add

drivers/mtd/ubi/ubi.h

+2 −0
Original line number Diff line number Diff line
@@ -374,9 +374,11 @@ void ubi_calculate_reserved(struct ubi_device *ubi); 
#ifdef CONFIG_MTD_UBI_GLUEBI

int ubi_create_gluebi(struct ubi_device *ubi, struct ubi_volume *vol);

int ubi_destroy_gluebi(struct ubi_volume *vol);

void ubi_gluebi_updated(struct ubi_volume *vol);

#else

#define ubi_create_gluebi(ubi, vol) 0

#define ubi_destroy_gluebi(vol) 0

#define ubi_gluebi_updated(vol)

#endif



/* eba.c */