Messages in this thread | | | Date | Sat, 02 Nov 2002 03:57:35 -0500 | From | Jeff Garzik <> | Subject | Re: [PATCH] 2/11 Ext2/3 Updates: Extended attributes, ACL, etc. |
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Theodore Ts'o wrote:
>I'm not sure ext2meta will be sufficient. It's not just a matter of >modifying the on-disk metadata, as would be needed for defrag, but I >would also need to modify some of the in-core data structions in the >ext2/3 filesystem data structures. For example, when you resize the >filesystem, you need to increase the number of group descriptors, >which means you need to kmalloc, copy, and then kfree sbi->group_desc >out from under the mounted filesystem. > >No doubt ext2meta could be modified so it could "reach out and touch" >internal ext2/3 fileststem data structures in core. But the locking >issues involved get really messy. > >
Like Al mentioned... any merge of ext[23]meta would be inside ext[23].o, so it would be a first class object and not some random module sticking its fingers in there. I looked at the locking issue too (though admittedly not in-depth for filesystem resize), and it's not different at all from existing locking, both in 2.4.x and 2.5.x. It's intentionally pretty darn compatible with existing locking :)
I'll post a patch in the next couple weeks...
Jeff
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