ext4: rip out DAX handling from direct IO path
Reads and writes for DAX inodes should no longer end up in direct IO code. Rip out the support and add a warning. Reviewed-by: NRoss Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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