On Tue, Jul 17, 2012 at 10:40:21PM -0300, Paulo Alcantara wrote: > From: Christoph Hellwig <hch@xxxxxxxxxxxxx> > Date: Tue, 17 Jul 2012 03:06:43 -0400 > > > Btw, if you need more reviers for the syslinus support feel free to pass > > it by me (or the list). > > This is the branch I'm maintaing for the XFS readonly driver: > > git://zytor.com/users/pcacjr/syslinux.git (branch: xfs) > > The current status is: > > - We are able to find the root inode by reading rootino field from > superblock (xfs_iget_root() function). > - We are able to find inodes that have core's format set to "local" only at > the moment, which is by reading leaf entries from inode btrees. The > function that looks up for an inode is the xfs_iget() one. We're looking > forward to implement the handling of keys in inode btrees (extents) also. > > Baoszi is currently working on the inode btree's key part (extents), and I'm > working on the data part of the file inode, which is the xfs_next_extent() > function. > > The xfs_next_extent() function must be able to read the inode (cast to the data > fork) and populate a structure that stores physical starting number sector and > number of consecutive sectors that contain the inode's data so that Syslinux > will know where to read from. As we discussed on #xfs, I'm still not convinced that parsing the filesystem metadata in the bootloader is the way to go. Far better, IMO, is simply to supply the bootloader with a list of extents for the blocks it needs to read to get the files it needs. You can get them via fiemap(), and it'll work for XFS, btrfs, ext3, ext4, etc without needing to write code to parse the on-disk format of every filesystem. Especially as we are in the process of making major changes to the XFS on-disk format, which means you'll have to make significant changes to support a second XFS disk format in the not-to-distant future... > Thanks for the interest in helping us! We want it to work! ;) Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
