linux-ext4 - Re: [PATCH 4/7][TAKE5] support new modes in fallocate

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Message-ID: <20070703100848.GA14936@amitarora.in.ibm.com>
Date:	Tue, 3 Jul 2007 15:38:48 +0530
From:	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>
To:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org
Cc:	adilger@...sterfs.com, David Chinner <dgc@....com>,
	suparna@...ibm.com, cmm@...ibm.com, xfs@....sgi.com,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 4/7][TAKE5] support new modes in fallocate

On Sat, Jun 30, 2007 at 12:52:46PM -0400, Andreas Dilger wrote:
> The @mode flags that are currently under consideration are (AFAIK):
> 
> FA_FL_DEALLOC		0x01 /* deallocate unwritten extent (default allocate) */
> FA_FL_KEEP_SIZE	0x02 /* keep size for EOF {pre,de}alloc (default change size) */
> FA_FL_DEL_DATA	0x04 /* delete existing data in alloc range (default keep) */

We now have two sets of flags - 
1) the above three with which I think no one has any issues with, and
2) the ones below, for which we need some discussions before finalizing
on them.

I will prefer fallocate going in mainline with the above three modes, and
rest of the modes can be debated upon and discussed parallely. And, each
new mode/flag can be pushed as a separate patch. This will not hold
fallocate feature indefinitely...

Please confirm if you find this approach ok. Otherwise, please object.
Thanks!

> FA_FL_ERR_FREE	0x08 /* free preallocation on error (default keep prealloc) */
> FA_FL_NO_MTIME	0x10 /* keep same mtime (default change on size, data change) */
> FA_FL_NO_CTIME	0x20 /* keep same ctime (default change on size, data change) */

--
Regards,
Amit Arora
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