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Date: Mon, 7 May 2007 11:57:00 -0400 From: Theodore Tso <tytso@....edu> To: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com> Cc: Andreas Dilger <adilger@...sterfs.com>, linux-ext4@...r.kernel.org Subject: Re: [RFC][take 4] e2fsprogs: Add ext4migrate On Mon, May 07, 2007 at 07:16:31PM +0530, Aneesh Kumar K.V wrote: > > One of the option i was thinking was to use this tool to migrate to > extent map and then towards the end use the online defrag ioctl to > defrag the resulting ext4 inode. As we discussed on the phone, my recommendation would be to take your existing code and move it into the kernel so that triggered off of an ioctl, your code could migrate an inode from using indirect blocks to extents while a filesystem is mounted. The main things you will need to watch for is to make sure the inode is locked so that another process doesn't try to extend or truncate it, and to use the JBD layer to provide appropriate journalling support. Given that ext4migrated imported the kernel extent functions, it should be relatively straightforward to simply make them use the kernel extent functions while in kernel space. Once the the inode has been converted on-line then it can be defragmented on-line. That would be much more convenient than having to unmount the filesystem to do the off-line migration, followed by mounting it to do the defragmentation. Regards, - Ted - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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