Christoph Hellwig 2e23834058 xfs: implement direct writes to zoned RT devices ...

Direct writes to zoned RT devices are extremely simple.  After taking the
block reservation before acquiring the iolock, the iomap direct I/O calls
into ->iomap_begin which will return a "fake" iomap for the entire
requested range.  The actual block allocation is then done from the
submit_io handler using code shared with the buffered I/O path.

The iomap_dio_ops set the bio_set to the (iomap) ioend one and initialize
the embedded ioend, which allows reusing the existing ioend based buffered
I/O completion path.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>

2025-03-03 08:17:07 -07:00

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