linux-ext4 - Re: [PATCH] filefrag: fix block size value

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Date:	Sun, 27 Jul 2014 20:28:46 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Rakesh Pandit <rakesh@...era.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] filefrag: fix block size value

On Thu, Jul 24, 2014 at 02:38:51PM +0300, Rakesh Pandit wrote:
> ioctl(FIGETBSZ) was used to get block size earlier but 2508eaa7
> (filefrag: improvements to filefrag FIEMAP handling) moved to fstatfs
> f_bsize which doesn't work well for many files systems.
> 
> Block size returned using fstatfs isn't block size but "optimal
> transfer block size" as per man page. Even stat st_blksize is
> "preferred I/O block size" and in may file systems it may even vary
> from file to file (POSIX). This patch returns back usage of FIGETBSZ
> to get block size. For file systems which don't support FIEMAP, this
> fixes the number of FIBMAP ioctl calls required.
> 
> Signed-off-by: Rakesh Pandit <rakesh@...era.com>

Thanks, applied.  I added fallback where if FIGETBSZ fails for some
reason, filefrag will now fall back to using f_bsize.

		      	       	       - Ted
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