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Commit 7ac5360c authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Dan Williams
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dax: remove the copy_from_iter and copy_to_iter methods


These methods indirect the actual DAX read/write path.  In the end pmem
uses magic flush and mc safe variants and fuse and dcssblk use plain ones
while device mapper picks redirects to the underlying device.

Add set_dax_nocache() and set_dax_nomc() APIs to control which copy
routines are used to remove indirect call from the read/write fast path
as well as a lot of boilerplate code.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: Vivek Goyal <vgoyal@redhat.com> [virtiofs]
Link: https://lore.kernel.org/r/20211215084508.435401-5-hch@lst.de


Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 30c6828a
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