linux-ext4 - Re: [PATCH 1/2] ext4: Recalculate journal credits as inode depth changes

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Date:	Mon, 15 Jun 2015 00:22:56 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Lukas Czerner <lczerner@...hat.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/2] ext4: Recalculate journal credits as inode depth
 changes

On Tue, Jun 09, 2015 at 08:58:45AM +0200, Lukas Czerner wrote:
> Currently in ext4_alloc_file_blocks() the number of credits is
> calculated only once before we enter the allocation loop. However within
> the allocation loop the extent tree depth can change, hence the number
> of credits needed can increase potentially exceeding the number of credits
> reserved in the handle which can cause journal failures.
> 
> Fix this by recalculating number of credits when the inode depth
> changes. Note that even though ext4_alloc_file_blocks() is only
> currently used by extent base inodes we will avoid recalculating number
> of credits unnecessarily in the case of indirect based inodes.
> 
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>

Thanks, applied.

					- Ted
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