xfs: use vmalloc instead of vm_map_area for buffer backing memory

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The fallback buffer allocation path currently open codes a suboptimal
version of vmalloc to allocate pages that are then mapped into
vmalloc space.  Switch to using vmalloc instead, which uses all the
optimizations in the common vmalloc code, and removes the need to
track the backing pages in the xfs_buf structure.

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

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Christoph Hellwig 2025-03-10 14:19:13 +01:00 • committed by Carlos Maiolino

parent fd87851680

commit e2874632a6

3 changed files with 53 additions and 177 deletions

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214

fs/xfs/xfs_buf.c

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7

fs/xfs/xfs_buf.h

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11

fs/xfs/xfs_buf_mem.c

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