linux-ext4 - Re: Question on fallocate/ftruncate sequence

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Date:	Fri, 25 Sep 2009 01:35:46 -0600
From:	Andreas Dilger <adilger@....com>
To:	Jiaying Zhang <jiayingz@...gle.com>
Cc:	Theodore Tso <tytso@....edu>, Frank Mayhar <fmayhar@...gle.com>,
	Eric Sandeen <sandeen@...hat.com>,
	Curt Wohlgemuth <curtw@...gle.com>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: Question on fallocate/ftruncate sequence

On Sep 23, 2009  22:27 -0700, Jiaying Zhang wrote:
> Sorry for taking so long to finish this. Here is the new patch based on
> Andreas's suggestions. Now the patch clears the EXT4_EOFBLOCKS_FL
> flag when we allocate beyond the maximum allocated block. I also
> made the EOFBLOCKS flag user visible and added the handling
> in ext4_ioctl as Andrea suggested.
> 
> Index: linux-2.6.30.5/include/linux/fs.h
> ===================================================================
> +#define FS_EOFBLOCKS_FL            0x00200000 /* Blocks allocated beyond EOF */

Can you please use 0x00400000 here.  I've already asked Ted to reserve
the 0x0020000 inode flag for use by large extended attributes.

>  #define FS_RESERVED_FL            0x80000000 /* reserved for ext2 lib */
> 
> -#define FS_FL_USER_VISIBLE        0x0003DFFF /* User visible flags */
> +#define FS_FL_USER_VISIBLE        0x0023DFFF /* User visible flags */

This would need to be changed to 0x0043DFFF to match.

Sorry, I haven't looked at the rest of the patch yet, just thought I'd
mention this early on.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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