Re: [PATCH v2 19/28] mke2fs: add inline_data support in mke2fs

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Wed, Dec 04, 2013 at 01:21:50PM +0800, Zheng Liu wrote:
> On Tue, Dec 03, 2013 at 08:08:19PM -0800, Darrick J. Wong wrote:
> > On Wed, Dec 04, 2013 at 11:27:57AM +0800, Zheng Liu wrote:
> > > On Tue, Dec 03, 2013 at 02:30:26PM -0800, Darrick J. Wong wrote:
> > > [...]
> > > > > +		 * notify users that inline data will never be useful.
> > > > > +		 */
> > > > > +		if ((fs_param.s_feature_incompat &
> > > > > +		     EXT4_FEATURE_INCOMPAT_INLINE_DATA) &&
> > > > > +		    inode_size == EXT2_GOOD_OLD_INODE_SIZE) {
> > > > 
> > > > Perhaps I'm missing something here, but why is it impossible to use i_blocks
> > > > for inline data even if there's no space for EAs?
> > > 
> > > If I understand correctly, on kernel side, we determine an inode has
> > > inline data according to whether we have 'system.data' xattr entry on
> > > inode extended attribute space.  If an inode doesn't have enough space
> > > to store an entry with 'system.data', we just think this inode doesn't
> > > has inline data.  So that is why I add this sanity check.
> > 
> > Ok.  I was curious.  Small inode => no inline data seems like an unfortunate
> > restriction to me, but oh well, it's your feature.  I don't plan to go back to
> > 128 byte inodes ever. :)
> > 
> > Also, we could store four more bytes if we created a new e_name_index value (5?
> > 9?) to represent "system.data".  Any thoughts about that?
> 
> Sorry, I don't get your point.  Do you want to create a new e_name_index?
> Any reason lets you want to do this?

Yep, that's exactly what I propose to do, so we can cram four more bytes into
the inline data.

--D
> 
>                                                 - Zheng
> 
> > 
> > --D
> > 
> > > 
> > > Regards,
> > >                                                 - Zheng
> > > --
> > > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
> > > the body of a message to majordomo@xxxxxxxxxxxxxxx
> > > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
> > the body of a message to majordomo@xxxxxxxxxxxxxxx
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> --
> To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Reiser Filesystem Development]     [Ceph FS]     [Kernel Newbies]     [Security]     [Netfilter]     [Bugtraq]     [Linux FS]     [Yosemite National Park]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Device Mapper]     [Linux Media]

  Powered by Linux