mm/swap: introduce struct swap_io_ctx

Generalize the context currently provided by double pointers to struct
swap_iocb to an on-stack context.  This cleans up the code and prepares
for adding more fields and supporting batching multiple folios into a
single bio for block-based swap as well.

This new swap_io_ctx is required for all functions using it, the old way
of allowing a NULL iocb for some callers is removed to keep the interface
consistent.  To reduce code duplication caused by this, a new
swap_cache_read_folio_sync helper is added to consolidate the code to call
swap_cache_read_folio with a local swap_io_ctx.

The unpug helpers are renamed to use the submit wording as they are
generalized.

Link: https://lore.kernel.org/20260713093350.2154226-3-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Nhat Pham <nphamcs@gmail.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Baoquan He <baoquan.he@linux.dev>
Cc: Barry Song <baohua@kernel.org>
Cc: Chris Li <chrisl@kernel.org>
Cc: Kairui Song <kasong@tencent.com>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Youngjun Park <youngjun.park@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

0 files changed, 0 insertions, 0 deletions