tree e560499b606e7c50bfe692d3e86613052d1be00f
parent 9f43d41416af43868737777cce4827b9ba1b2855
author Jens Axboe <axboe@kernel.dk> 1730843776 -0700
committer Jens Axboe <axboe@kernel.dk> 1730926183 -0700

iomap: make buffered writes work with RWF_UNCACHED

Add iomap buffered write support for RWF_UNCACHED. If RWF_UNCACHED is
set for a write, mark the folios being written with drop_writeback. Then
writeback completion will drop the pages. The write_iter handler simply
kicks off writeback for the pages, and writeback completion will take
care of the rest.

See the similar patch for the generic filemap handling for performance
results, those were in fact done on XFS using this patch.

Signed-off-by: Jens Axboe <axboe@kernel.dk>