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    block: revert runtime dax control of the raw block device · 9f4736fe
    Dan Williams 提交于
    Dynamically enabling DAX requires that the page cache first be flushed
    and invalidated.  This must occur atomically with the change of DAX mode
    otherwise we confuse the fsync/msync tracking and violate data
    durability guarantees.  Eliminate the possibilty of DAX-disabled to
    DAX-enabled transitions for now and revisit this for the next cycle.
    
    Cc: Jan Kara <jack@suse.com>
    Cc: Jeff Moyer <jmoyer@redhat.com>
    Cc: Christoph Hellwig <hch@lst.de>
    Cc: Dave Chinner <david@fromorbit.com>
    Cc: Matthew Wilcox <willy@linux.intel.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
    Signed-off-by: NDan Williams <dan.j.williams@intel.com>
    9f4736fe
block_dev.c 48.0 KB