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

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Message-ID: <5df78e1d0909251508id9c8652tdf09afdd5376ace0@mail.gmail.com>
Date:	Fri, 25 Sep 2009 15:08:01 -0700
From:	Jiaying Zhang <jiayingz@...gle.com>
To:	Andreas Dilger <adilger@....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

Thanks a lot for the notification! I will change it in my patch.

Jiaying

On Fri, Sep 25, 2009 at 12:35 AM, Andreas Dilger <adilger@....com> wrote:
> 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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