xfs: implement direct writes to zoned RT devices

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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>

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This commit is contained in:

Christoph Hellwig 2025-01-27 15:35:00 +01:00

parent 058dd70c65

commit 2e23834058

5 changed files with 132 additions and 11 deletions

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6

fs/xfs/xfs_aops.c

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3

fs/xfs/xfs_aops.h

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80

fs/xfs/xfs_file.c

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53

fs/xfs/xfs_iomap.c

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1

fs/xfs/xfs_iomap.h

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