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mm/swap: add a new swap_ops.h header to allow for pluggable swap ops

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Add a new header to declare the swap_iocb, swap_ops and swap_ctx to allow
for swap_ops implementations outside of mm/page_io.c.  This will be used
to remove the double indirection for file system-based swap.  There is no
functional change, just a move of the declarations.

Note that there already is a swapops.h header, which is totally unrelated
to struct swap_ops.  The close naming is a bit unfortunate, but I could
not think of a better name for this header.

Link: https://lore.kernel.org/20260723054622.3460249-3-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Chris Li <chrisl@kernel.org>
Cc: Baoquan He <baoquan.he@linux.dev>
Cc: Kairui Song <kasong@tencent.com>
Cc: Kairui Song <ryncsn@gmail.com>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Steve French <sfrench@samba.org>
Cc: Usama Arif <usama.arif@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Christoph Hellwig 2026-07-23 07:46:05 +02:00 • committed by Andrew Morton
commit 52d85ca90c
9 changed files with 47 additions and 32 deletions
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