Re: [PATCH] ubifs: Correctly initialize c->min_log_bytes

[Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>]

Hello Richard,

On Thu, Jul 25, 2019 at 10:56:27PM +0200, Richard Weinberger wrote:
> Currently on a freshly mounted UBIFS, c->min_log_bytes is 0.
> This can lead to a log overrun and make commits fail.
> 
> Recent kernels will report the following assert:
> UBIFS assert failed: c->lhead_lnum != c->ltail_lnum, in fs/ubifs/log.c:412
> 
> c->min_log_bytes can have two states, 0 and c->leb_size.
> It controls how much bytes of the log area are reserved for non-bud
> nodes such as commit nodes.
> 
> After a commit it has to be set to c->leb_size such that we have always
> enought space for a commit. While a commit runs it can be 0 to make the

s/enought/enough/

> remaining bytes of the log available to writers.
> 
> Having it set to 0 right after mount is wrong since no space for commits
> is reserved.
> 
> Reported-and-tested-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
> Signed-off-by: Richard Weinberger <richard@xxxxxx>

Thanks for your support
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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