On Tue, Mar 11, 2008 at 04:11:23PM +0100, Jan Kara wrote: > Actually, this is nastier than it looks - currently fs, asks > ext3_sb_getblk() for block 'a' and it gets buffer head with b_blocknr == 'b' > instead. Note that it will be a different device as well, in the case of an external journal. > So when remounting you'd have to rewrite these buffers with > original block numbers which is not really possible. So I think > remapping will have to be solved differently, like providing buffer > head with correct b_blocknr but taking care when reading data to it and > reading them from elsewhere. Actually, this has to be done anyway > because JBD escapes data in the journal and you have to do unescaping > when reading data... Hmm, I'll think about this and try to get something working. As a quick proof-of-concept hack, getting both buffers then overwriting the fs block's data with the unescaped journal data should do the trick, right? Cheers, Duane. -- "I never could learn to drink that blood and call it wine" - Bob Dylan -- 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
