linux-ext4 - Re: inode version updates

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Message-ID: <467176C4.5000404@us.ibm.com>
Date:	Thu, 14 Jun 2007 10:11:32 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	Andreas Dilger <adilger@...sterfs.com>
CC:	linux-ext4@...r.kernel.org
Subject: Re: inode version updates

Andreas Dilger wrote:
> Mingming Cao <cmm@...ibm.com> writes:
> 
>>I took out the i_version code from Kalpak's
>>ext4_expand_inode_extra_isize.patch. 
>>
>>http://repo.or.cz/w/ext4-patch-queue.git?a=blob;f=ext4_i_version_hi_2.patch;h=4519dd6540a78cadd235dad68248456d59c3384c;hb=8b956b5c5ccc3731f23fbce8d036b21f378fbdec
>>
>>Added Jean noel's inode version VFS patch and Ext4 patches. Now the full
>>inode version patch series can be found at ext4 patch queue:
>>
>># inode verion patch series
>># inode versioning is needed for NFSv4
>>
>># vfs changes, 64 bit inode->i_version
>>i_version_update_vfs.patch
> 
> 
> Looking through this, I don't understand why there are i_version updates
> in the VFS?  The comments here imply that this is only for filesystems
> which will never be mounted (e.g. pipefs).  Having i_version updates there
> is confusing and I don't think it helps anyone.
> 
> 
>># ext4 inode version update
>>i_version_update_ext4.patch
>>--- linux-2.6.22-rc4.orig/fs/ext4/super.c       2007-06-13 17:19:11.000000000 -0700
>>+++ linux-2.6.22-rc4/fs/ext4/super.c    2007-06-13 17:24:45.000000000 -0700
>>@@ -2846,8 +2846,8 @@ out:
>>               i_size_write(inode, off+len-towrite);
>>               EXT4_I(inode)->i_disksize = inode->i_size;
>>       }
>>-       inode->i_version++;
>>       inode->i_mtime = inode->i_ctime = CURRENT_TIME;
>>+       inode->i_version = 1;
>>       ext4_mark_inode_dirty(handle, inode);
>>       mutex_unlock(&inode->i_mutex);
>>       return len - towrite;
> 
> 
> The change from "i_version++" to "i_version = 1" in ext4_update_quota()
> is confusing.  Why was this change made?  If there is a good reason why
> the inode version stays at 1 for the quota file, maybe it deserves
> a comment explaining it.
> 

I agree with both of your comments.

Mingming

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