Retrieving number of free unused eraseblocks in a UBI filesystem

[Boris Brezillon]

On Wed, 7 Dec 2016 11:59:13 +0000
Martin Townsend <mtownsend1973 at gmail.com> wrote:

> Hi,
> 
> I'm running a 4.1 Kernel and have a UBI Filesystem with 2 volumes
> taking up all the NAND.
> ubinfo -d 0
> ubi0
> Volumes count:                           2
> Logical eraseblock size:                 126976 bytes, 124.0 KiB
> Total amount of logical eraseblocks:     4016 (509935616 bytes, 486.3 MiB)
> Amount of available logical eraseblocks: 0 (0 bytes)
> Maximum count of volumes                 128
> Count of bad physical eraseblocks:       56
> Count of reserved physical eraseblocks:  24
> Current maximum erase counter value:     15
> Minimum input/output unit size:          2048 bytes
> Character device major/minor:            249:0
> Present volumes:                         0, 1
> 
> So I'm guessing that the Total amount of logical erase blocks is 0 as
> this is because I have 2 volumes of a fixed size that take up all the
> available eraseblocks of the /dev/ubi0 device.
> 
> Is there a way of getting, per volume preferably, the number of
> eraseblocks that aren't being used? Or conversely get the number of
> eraseblocks that are used as I can work it out from the total amount
> of logical eraseblocks.

cat /sys/class/ubi/ubiX_Y/reserved_ebs

where X is the UBI device id and Y is the volume id.

> 
> Many Thanks,
> Martin.
> 
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