xfs: look up cow fork extent earlier for buffered iomap_begin

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To further isolate the need for flushing for zero range, we need to
know whether a hole in the data fork is fronted by blocks in the COW
fork or not. COW fork lookup currently occurs further down in the
function, after the zero range case is handled.

As a preparation step, lift the COW fork extent lookup to earlier in
the function, at the same time as the data fork lookup. Only the
lookup logic is lifted. The COW fork branch/reporting logic remains
as is to avoid any observable behavior change from an iomap
reporting perspective.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

...

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Brian Foster 2026-03-11 12:24:59 -04:00 • committed by Carlos Maiolino

parent c35a3e273e

commit a8eb41376d

1 changed files with 25 additions and 21 deletions

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fs/xfs/xfs_iomap.c

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