From: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
To: "Mattias Rönnblom" <hofors@lysator.liu.se>
Cc: linux-kernel@vger.kernel.org
Subject: Re: VFAT truncate performance
Date: Tue, 05 Sep 2006 23:59:52 +0900 [thread overview]
Message-ID: <8764g28il3.fsf@duaron.myhome.or.jp> (raw)
In-Reply-To: <m3mz9e5sk1.fsf@isengard.friendlyfire.se> (Mattias =?iso-8859-1?Q?R=F6nnblom's?= message of "05 Sep 2006 15\:52\:46 +0200")
Mattias Rönnblom <hofors@lysator.liu.se> writes:
> extending files by ftruncate(2) runs very slow on VFAT file
> systems. On my USB harddisk w/ VFAT, it takes 14 seconds to extend an
> empty file to 1 GB. On a memory stick, it takes well over 4 minutes.
>
> My question is: is this problem on the conceptual level (ie there is
> no way of extending files on FAT that doesn't involve many disk
> operations) or is the current Linux fs driver suboptimal in this
> respect?
Unfortunately FAT doesn't support sparse file, so ftruncate(2) which
extend size needs to fill all clusters with zero, and write data.
This is limitation of FAT filesystem.
--
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
next prev parent reply other threads:[~2006-09-05 15:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-05 13:52 Mattias Rönnblom
2006-09-05 14:55 ` Xavier Bestel
2006-09-05 15:38 ` Mattias Rönnblom
2006-09-05 14:59 ` OGAWA Hirofumi [this message]
[not found] <6RJD8-3i0-1@gated-at.bofh.it>
2006-09-05 19:38 ` Bodo Eggert
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