Hello, I'm looking for a FS in Linux that supports concurrent direct IO write. ext4 supports concurrent direct IO read if we mount it with dioread_nolock, but doesn't support concurrent writes. XFS doesn't support concurrent direct IO at all. It locks the inode exclusive if it's direct IO. I tried btrfs, and it seems it doesn't support concurrent direct IO either though I haven't looked into its code. Is there a local FS that support concurrent direct IO write? It seems NFS supports it ( http://kevinclosson.wordpress.com/2011/08/12/file-systems-for-a-database-choose-one-that-couples-direct-io-and-concurrent-io-whats-this-have-to-do-with-nfs-harken-back-5-2-years-to-find-out/), but I'm looking for local FS.
Thanks, Da
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