On Thu, Oct 23, 2008 at 12:19:21PM +0800, wengang wang wrote:
> Ocfs2 supports exporting.
>
> PROBLEM:
> There are 2 problems
> (1) Current version of ocfs2_get_dentry() may read from disk
> the inode WITHOUT any cross cluster lock. This may lead to load a stale inode.
> (2) for deleting an inode, ocfs2_remove_inode() doesn't sync/checkpoint to
> disk.
> This also may lead ocfs2_get_dentry() from other node read out stale inode.
>
<snip>
> SOLUTION:
> (I) adds cross cluster lock for deletion and reading inode from nfs. Deletion
> takes EX lock which blocks readings on the same inode block; readings take PR
> lock which blocks deleting the same inode block.
> (II) checkpoints disk updates for deletion within the cross cluster lock.
Cluster locking in an already slow path really bothers me,
especially since I gotta believe we already have the state to do this
locally.
What's the problem other than ESTALE? That's perfectly valid in
the world of NFS.
Joel
--
"Up and down that road in our worn out shoes,
Talking bout good things and singing the blues."
Joel Becker
Principal Software Developer
Oracle
E-mail: [EMAIL PROTECTED]
Phone: (650) 506-8127
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