xfs: fix incorrect use of gfp flags in xfs_buf_alloc_backing_mem

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xfs_buf_alloc_backing_mem currently has two issues with how the GFP_
flags are set:

  - when aiming for a large folio allocation, the gfp mask is adjusted
    to try less hard, but these flags then persist for the vmalloc
    allocation, which is bogus.
  - the __GFP_NOFAIL for small allocations is also applied when readahead
    force __GFP_NORETRY which doesn't make any sense.

Fix this by only applying __GFP_NOFAIL when __GFP_NORETRY is not set,
and by reordering the code so that the large folio gfp adjustments
are performed locally just for that allocation.

Fixes: 94c78cfa3b ("xfs: convert buffer cache to use high order folios")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

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Christoph Hellwig 2026-06-17 07:58:04 +02:00 • committed by Carlos Maiolino

parent 27d7d15184

commit 0144bcf619

1 changed files with 23 additions and 26 deletions

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fs/xfs/xfs_buf.c

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