From 941dfb07ed91451b1c58626a0d258dfdf468b593 Mon Sep 17 00:00:00 2001 From: Artem Bityutskiy Date: Sat, 5 May 2007 16:33:13 +0300 Subject: 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: John Smith Signed-off-by: Artem Bityutskiy --- drivers/mtd/ubi/gluebi.c | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) (limited to 'drivers/mtd/ubi/gluebi.c') diff --git a/drivers/mtd/ubi/gluebi.c b/drivers/mtd/ubi/gluebi.c index fc9478d..41ff74c 100644 --- a/drivers/mtd/ubi/gluebi.c +++ b/drivers/mtd/ubi/gluebi.c @@ -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; +} -- cgit v1.1