linux-kernel - Re: [RFC] Heads up on sys

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Date:	Fri, 2 Mar 2007 14:41:01 +0100 (MET)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org, suparna@...ibm.com, cmm@...ibm.com,
	alex@...sterfs.com, suzuki@...ibm.com,
	Ulrich Drepper <drepper@...hat.com>
Subject: Re: [RFC] Heads up on sys_fallocate()


On Mar 1 2007 23:09, Dave Kleikamp wrote:
>> 
>> Given that glibc already implements fallocate for all filesystems, it will
>> need to continue to do so for filesystems which don't implement this
>> syscall - otherwise applications would start breaking.
>
>I didn't make it clear, but my point was to call generic_fallocate if
>the file system did not define i_op->allocate().
>
>if (inode->i_op && inode->i_op->fallocate)
>	ret = inode->i_op->fallocate(inode, offset, len);
>else
>	ret = generic_fallocate(inode, offset, len);
>
>I'm not sure it's worth the effort, but I thought I'd throw the idea out
>there.

Writing zeroes using glibc emu most likely means write() --
so generic_fallocate should be preferable (think splice).
Or does glibc use mmap() and it's all different?


Jan
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