From 978d6496758d19de2431ebf163337fc7b92f8c45 Mon Sep 17 00:00:00 2001 From: Ezequiel Garcia Date: Fri, 29 Aug 2014 18:42:28 -0300 Subject: [PATCH] UBI: block: Fix block device size setting We are currently taking the block device size from the ubi_volume_info.size field. However, this is not the amount of data in the volume, but the number of reserved physical eraseblocks, and hence leads to an incorrect representation of the volume. In particular, this produces I/O errors on static volumes as the block interface may attempt to read unmapped PEBs: $ cat /dev/ubiblock0_0 > /dev/null UBI error: ubiblock_read_to_buf: ubiblock0_0 ubi_read error -22 end_request: I/O error, dev ubiblock0_0, sector 9536 Buffer I/O error on device ubiblock0_0, logical block 2384 [snip] Fix this by using the ubi_volume_info.used_bytes field which is set to the actual number of data bytes for both static and dynamic volumes. While here, improve the error message to be less stupid and more useful: UBI error: ubiblock_read_to_buf: ubiblock0_1 ubi_read error -9 on LEB=0, off=15872, len=512 It's worth noticing that the 512-byte sector representation of the volume is only correct if the volume size is multiple of 512-bytes. This is true for virtually any NAND device, given eraseblocks and pages are 512-byte multiple and hence so is the LEB size. Artem: tweak the error message and make it look more like other UBI error messages. Fixes: 9d54c8a33eec ("UBI: R/O block driver on top of UBI volumes") Signed-off-by: Ezequiel Garcia Signed-off-by: Artem Bityutskiy Cc: stable@vger.kernel.org # v3.15+ --- drivers/mtd/ubi/block.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c index 518792b7634d..581784485376 100644 --- a/drivers/mtd/ubi/block.c +++ b/drivers/mtd/ubi/block.c @@ -188,8 +188,9 @@ static int ubiblock_read_to_buf(struct ubiblock *dev, char *buffer, ret = ubi_read(dev->desc, leb, buffer, offset, len); if (ret) { - ubi_err("%s ubi_read error %d", - dev->gd->disk_name, ret); + ubi_err("%s: error %d while reading from LEB %d (offset %d, " + "length %d)", dev->gd->disk_name, ret, leb, offset, + len); return ret; } return 0; @@ -378,7 +379,7 @@ int ubiblock_create(struct ubi_volume_info *vi) { struct ubiblock *dev; struct gendisk *gd; - u64 disk_capacity = ((u64)vi->size * vi->usable_leb_size) >> 9; + u64 disk_capacity = vi->used_bytes >> 9; int ret; if ((sector_t)disk_capacity != disk_capacity) @@ -502,7 +503,7 @@ int ubiblock_remove(struct ubi_volume_info *vi) static int ubiblock_resize(struct ubi_volume_info *vi) { struct ubiblock *dev; - u64 disk_capacity = ((u64)vi->size * vi->usable_leb_size) >> 9; + u64 disk_capacity = vi->used_bytes >> 9; /* * Need to lock the device list until we stop using the device, @@ -524,7 +525,7 @@ static int ubiblock_resize(struct ubi_volume_info *vi) mutex_lock(&dev->dev_mutex); set_capacity(dev->gd, disk_capacity); - ubi_msg("%s resized to %d LEBs", dev->gd->disk_name, vi->size); + ubi_msg("%s resized to %lld bytes", dev->gd->disk_name, vi->used_bytes); mutex_unlock(&dev->dev_mutex); mutex_unlock(&devices_mutex); return 0; -- 2.20.1