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

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Message-ID: <45E83FCE.4040008@redhat.com>
Date:	Fri, 02 Mar 2007 09:16:30 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	Badari Pulavarty <pbadari@...ibm.com>
CC:	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>, suparna@...ibm.com,
	cmm@...ibm.com, alex@...sterfs.com, suzuki@...ibm.com
Subject: Re: [RFC] Heads up on sys_fallocate()

Badari Pulavarty wrote:
> 
> Amit K. Arora wrote:
> 
>> This is to give a heads up on few patches that we will be soon coming up
>> with. These patches implement a new system call sys_fallocate() and a
>> new inode operation "fallocate", for persistent preallocation. The new
>> system call, as Andrew suggested, will look like:
>>
>>  asmlinkage long sys_fallocate(int fd, loff_t offset, loff_t len);
>>
> I am wondering about return values from this syscall ? Is it supposed to 
> return the
> number of bytes allocated ? What about partial allocations ? 

If you don't have enough blocks to cover the request, you should 
probably just return -ENOSPC, not a partial allocation.

> What about 
> if the
> blocks already exists ? What would be return values in those cases ?

0 on success, other normal errors oetherwise..

If asked for a range that includes already-allocated blocks, you just 
allocate any non-allocated blocks in the range, I think.

-Eric

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