[merged mm-stable] mm-swap-introduce-struct-swap_io_ctx.patch removed from -mm tree

[merged mm-stable] mm-swap-introduce-struct-swap_io_ctx.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/swap: introduce struct swap_io_ctx
has been removed from the -mm tree.  Its filename was
     mm-swap-introduce-struct-swap_io_ctx.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Christoph Hellwig <hch@lst.de>
Subject: mm/swap: introduce struct swap_io_ctx
Date: Mon, 13 Jul 2026 11:33:39 +0200

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>
---

 mm/madvise.c    |   16 ++++++------
 mm/page_io.c    |   60 ++++++++++++++++++++++++----------------------
 mm/shmem.c      |   13 ++++++---
 mm/swap.h       |   35 +++++++++++---------------
 mm/swap_state.c |   53 +++++++++++++++++++++++-----------------
 mm/vmscan.c     |   15 +++++------
 mm/zswap.c      |    4 ++-
 7 files changed, 105 insertions(+), 91 deletions(-)

--- a/mm/madvise.c~mm-swap-introduce-struct-swap_io_ctx
+++ a/mm/madvise.c
@@ -188,7 +188,7 @@ static int swapin_walk_pmd_entry(pmd_t *
 		unsigned long end, struct mm_walk *walk)
 {
 	struct vm_area_struct *vma = walk->private;
-	struct swap_iocb *splug = NULL;
+	struct swap_io_ctx ctx = {};
 	pte_t *ptep = NULL;
 	spinlock_t *ptl;
 	unsigned long addr;
@@ -212,15 +212,15 @@ static int swapin_walk_pmd_entry(pmd_t *
 		pte_unmap_unlock(ptep, ptl);
 		ptep = NULL;
 
-		folio = read_swap_cache_async(entry, GFP_HIGHUSER_MOVABLE,
-					     vma, addr, &splug);
+		folio = read_swap_cache_async(&ctx, entry, GFP_HIGHUSER_MOVABLE,
+					vma, addr);
 		if (folio)
 			folio_put(folio);
 	}
 
 	if (ptep)
 		pte_unmap_unlock(ptep, ptl);
-	swap_read_unplug(splug);
+	swap_read_submit(&ctx);
 	cond_resched();
 
 	return 0;
@@ -238,7 +238,7 @@ static void shmem_swapin_range(struct vm
 	XA_STATE(xas, &mapping->i_pages, linear_page_index(vma, start));
 	pgoff_t end_index = linear_page_index(vma, end) - 1;
 	struct folio *folio;
-	struct swap_iocb *splug = NULL;
+	struct swap_io_ctx ctx = {};
 
 	rcu_read_lock();
 	xas_for_each(&xas, folio, end_index) {
@@ -257,15 +257,15 @@ static void shmem_swapin_range(struct vm
 		xas_pause(&xas);
 		rcu_read_unlock();
 
-		folio = read_swap_cache_async(entry, mapping_gfp_mask(mapping),
-					     vma, addr, &splug);
+		folio = read_swap_cache_async(&ctx, entry,
+				mapping_gfp_mask(mapping), vma, addr);
 		if (folio)
 			folio_put(folio);
 
 		rcu_read_lock();
 	}
 	rcu_read_unlock();
-	swap_read_unplug(splug);
+	swap_read_submit(&ctx);
 }
 #endif		/* CONFIG_SWAP */
 
--- a/mm/page_io.c~mm-swap-introduce-struct-swap_io_ctx
+++ a/mm/page_io.c
@@ -248,7 +248,7 @@ static void swap_zeromap_folio_clear(str
  * We may have stale swap cache pages in memory: notice
  * them here and get rid of the unnecessary final write.
  */
-int swap_writeout(struct folio *folio, struct swap_iocb **swap_plug)
+int swap_writeout(struct swap_io_ctx *ctx, struct folio *folio)
 {
 	int ret = 0;
 
@@ -295,7 +295,7 @@ int swap_writeout(struct folio *folio, s
 	}
 	rcu_read_unlock();
 
-	__swap_writepage(folio, swap_plug);
+	__swap_writepage(ctx, folio);
 	return 0;
 out_unlock:
 	folio_unlock(folio);
@@ -390,9 +390,9 @@ static void sio_write_complete(struct ki
 	mempool_free(sio, sio_pool);
 }
 
-static void swap_writepage_fs(struct folio *folio, struct swap_iocb **swap_plug)
+static void swap_writepage_fs(struct swap_io_ctx *ctx, struct folio *folio)
 {
-	struct swap_iocb *sio = swap_plug ? *swap_plug : NULL;
+	struct swap_iocb *sio = ctx->sio;
 	struct swap_info_struct *sis = __swap_entry_to_info(folio->swap);
 	struct file *swap_file = sis->swap_file;
 	loff_t pos = swap_dev_pos(folio->swap);
@@ -403,7 +403,7 @@ static void swap_writepage_fs(struct fol
 	if (sio) {
 		if (sio->iocb.ki_filp != swap_file ||
 		    sio->iocb.ki_pos + sio->len != pos) {
-			swap_write_unplug(sio);
+			swap_write_submit(ctx);
 			sio = NULL;
 		}
 	}
@@ -418,12 +418,11 @@ static void swap_writepage_fs(struct fol
 	bvec_set_folio(&sio->bvecs[sio->nr_bvecs], folio, folio_size(folio), 0);
 	sio->len += folio_size(folio);
 	sio->nr_bvecs += 1;
-	if (sio->nr_bvecs == ARRAY_SIZE(sio->bvecs) || !swap_plug) {
-		swap_write_unplug(sio);
+	if (sio->nr_bvecs == ARRAY_SIZE(sio->bvecs)) {
+		swap_write_submit(ctx);
 		sio = NULL;
 	}
-	if (swap_plug)
-		*swap_plug = sio;
+	ctx->sio = sio;
 }
 
 static void swap_writepage_bdev_sync(struct folio *folio,
@@ -463,7 +462,7 @@ static void swap_writepage_bdev_async(st
 	submit_bio(bio);
 }
 
-void __swap_writepage(struct folio *folio, struct swap_iocb **swap_plug)
+void __swap_writepage(struct swap_io_ctx *ctx, struct folio *folio)
 {
 	struct swap_info_struct *sis = __swap_entry_to_info(folio->swap);
 
@@ -474,7 +473,7 @@ void __swap_writepage(struct folio *foli
 	 * is safe.
 	 */
 	if (data_race(sis->flags & SWP_FS_OPS))
-		swap_writepage_fs(folio, swap_plug);
+		swap_writepage_fs(ctx, folio);
 	/*
 	 * ->flags can be updated non-atomically,
 	 * but that will never affect SWP_SYNCHRONOUS_IO, so the data_race
@@ -486,16 +485,20 @@ void __swap_writepage(struct folio *foli
 		swap_writepage_bdev_async(folio, sis);
 }
 
-void swap_write_unplug(struct swap_iocb *sio)
+void swap_write_submit(struct swap_io_ctx *ctx)
 {
+	struct swap_iocb *sio = ctx->sio;
 	struct iov_iter from;
-	struct address_space *mapping = sio->iocb.ki_filp->f_mapping;
 	int ret;
 
+	if (!sio)
+		return;
+
 	iov_iter_bvec(&from, ITER_SOURCE, sio->bvecs, sio->nr_bvecs, sio->len);
-	ret = mapping->a_ops->swap_rw(&sio->iocb, &from);
+	ret = sio->iocb.ki_filp->f_mapping->a_ops->swap_rw(&sio->iocb, &from);
 	if (ret != -EIOCBQUEUED)
 		sio_write_complete(&sio->iocb, ret);
+	ctx->sio = NULL;
 }
 
 static void sio_read_complete(struct kiocb *iocb, long ret)
@@ -587,18 +590,16 @@ static bool swap_read_folio_zeromap(stru
 	return true;
 }
 
-static void swap_read_folio_fs(struct folio *folio, struct swap_iocb **plug)
+static void swap_read_folio_fs(struct swap_io_ctx *ctx, struct folio *folio)
 {
 	struct swap_info_struct *sis = __swap_entry_to_info(folio->swap);
-	struct swap_iocb *sio = NULL;
+	struct swap_iocb *sio = ctx->sio;
 	loff_t pos = swap_dev_pos(folio->swap);
 
-	if (plug)
-		sio = *plug;
 	if (sio) {
 		if (sio->iocb.ki_filp != sis->swap_file ||
 		    sio->iocb.ki_pos + sio->len != pos) {
-			swap_read_unplug(sio);
+			swap_read_submit(ctx);
 			sio = NULL;
 		}
 	}
@@ -613,12 +614,11 @@ static void swap_read_folio_fs(struct fo
 	bvec_set_folio(&sio->bvecs[sio->nr_bvecs], folio, folio_size(folio), 0);
 	sio->len += folio_size(folio);
 	sio->nr_bvecs += 1;
-	if (sio->nr_bvecs == ARRAY_SIZE(sio->bvecs) || !plug) {
-		swap_read_unplug(sio);
+	if (sio->nr_bvecs == ARRAY_SIZE(sio->bvecs)) {
+		swap_read_submit(ctx);
 		sio = NULL;
 	}
-	if (plug)
-		*plug = sio;
+	ctx->sio = sio;
 }
 
 static void swap_read_folio_bdev_sync(struct folio *folio,
@@ -658,7 +658,7 @@ static void swap_read_folio_bdev_async(s
 	submit_bio(bio);
 }
 
-void swap_read_folio(struct folio *folio, struct swap_iocb **plug)
+void swap_read_folio(struct swap_io_ctx *ctx, struct folio *folio)
 {
 	struct swap_info_struct *sis = __swap_entry_to_info(folio->swap);
 	bool synchronous = sis->flags & SWP_SYNCHRONOUS_IO;
@@ -693,7 +693,7 @@ void swap_read_folio(struct folio *folio
 	zswap_folio_swapin(folio);
 
 	if (data_race(sis->flags & SWP_FS_OPS)) {
-		swap_read_folio_fs(folio, plug);
+		swap_read_folio_fs(ctx, folio);
 	} else if (synchronous) {
 		swap_read_folio_bdev_sync(folio, sis);
 	} else {
@@ -708,14 +708,18 @@ finish:
 	delayacct_swapin_end();
 }
 
-void __swap_read_unplug(struct swap_iocb *sio)
+void swap_read_submit(struct swap_io_ctx *ctx)
 {
+	struct swap_iocb *sio = ctx->sio;
 	struct iov_iter from;
-	struct address_space *mapping = sio->iocb.ki_filp->f_mapping;
 	int ret;
 
+	if (!sio)
+		return;
+
 	iov_iter_bvec(&from, ITER_DEST, sio->bvecs, sio->nr_bvecs, sio->len);
-	ret = mapping->a_ops->swap_rw(&sio->iocb, &from);
+	ret = sio->iocb.ki_filp->f_mapping->a_ops->swap_rw(&sio->iocb, &from);
 	if (ret != -EIOCBQUEUED)
 		sio_read_complete(&sio->iocb, ret);
+	ctx->sio = NULL;
 }
--- a/mm/shmem.c~mm-swap-introduce-struct-swap_io_ctx
+++ a/mm/shmem.c
@@ -1597,13 +1597,13 @@ start_over:
 
 /**
  * shmem_writeout - Write the folio to swap
+ * @ctx: swap I/O context
  * @folio: The folio to write
- * @plug: swap plug
  * @folio_list: list to put back folios on split
  *
  * Move the folio from the page cache to the swap cache.
  */
-int shmem_writeout(struct folio *folio, struct swap_iocb **plug,
+int shmem_writeout(struct swap_io_ctx *ctx, struct folio *folio,
 		struct list_head *folio_list)
 {
 	struct address_space *mapping = folio->mapping;
@@ -1715,7 +1715,7 @@ try_split:
 		shmem_delete_from_page_cache(folio, swp_to_radix_entry(folio->swap));
 
 		BUG_ON(folio_mapped(folio));
-		error = swap_writeout(folio, plug);
+		error = swap_writeout(ctx, folio);
 		if (error != AOP_WRITEPAGE_ACTIVATE) {
 			/* folio has been unlocked */
 			return error;
@@ -1754,7 +1754,12 @@ redirty:
 
 int shmem_write_folio(struct folio *folio)
 {
-	return shmem_writeout(folio, NULL, NULL);
+	struct swap_io_ctx ctx = {};
+	int err;
+
+	err = shmem_writeout(&ctx, folio, NULL);
+	swap_write_submit(&ctx);
+	return err;
 }
 EXPORT_SYMBOL_GPL(shmem_write_folio);
 
--- a/mm/swap.h~mm-swap-introduce-struct-swap_io_ctx
+++ a/mm/swap.h
@@ -91,6 +91,10 @@ static inline int mem_cgroup_swappiness(
 	return READ_ONCE(vm_swappiness);
 }
 
+struct swap_io_ctx {
+	struct swap_iocb	*sio;
+};
+
 #ifdef CONFIG_SWAP
 #include <linux/swapops.h> /* for swp_offset */
 #include <linux/blk_types.h> /* for bio_end_io_t */
@@ -253,17 +257,11 @@ extern void __swap_cluster_free_entries(
 
 /* linux/mm/page_io.c */
 int sio_pool_init(void);
-struct swap_iocb;
-void swap_read_folio(struct folio *folio, struct swap_iocb **plug);
-void __swap_read_unplug(struct swap_iocb *plug);
-static inline void swap_read_unplug(struct swap_iocb *plug)
-{
-	if (unlikely(plug))
-		__swap_read_unplug(plug);
-}
-void swap_write_unplug(struct swap_iocb *sio);
-int swap_writeout(struct folio *folio, struct swap_iocb **swap_plug);
-void __swap_writepage(struct folio *folio, struct swap_iocb **swap_plug);
+void swap_read_folio(struct swap_io_ctx *ctx, struct folio *folio);
+void swap_read_submit(struct swap_io_ctx *ctx);
+void swap_write_submit(struct swap_io_ctx *ctx);
+int swap_writeout(struct swap_io_ctx *ctx, struct folio *folio);
+void __swap_writepage(struct swap_io_ctx *ctx, struct folio *folio);
 
 /* linux/mm/swap_state.c */
 extern struct address_space swap_space __read_mostly;
@@ -330,9 +328,8 @@ void __swap_cache_replace_folio(struct s
 
 void show_swap_cache_info(void);
 void swapcache_clear(struct swap_info_struct *si, swp_entry_t entry, int nr);
-struct folio *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
-		struct vm_area_struct *vma, unsigned long addr,
-		struct swap_iocb **plug);
+struct folio *read_swap_cache_async(struct swap_io_ctx *ctx, swp_entry_t entry,
+		gfp_t gfp_mask, struct vm_area_struct *vma, unsigned long addr);
 struct folio *swap_cluster_readahead(swp_entry_t entry, gfp_t flag,
 		struct mempolicy *mpol, pgoff_t ilx);
 struct folio *swapin_readahead(swp_entry_t entry, gfp_t flag,
@@ -348,7 +345,6 @@ static inline unsigned int folio_swap_fl
 }
 
 #else /* CONFIG_SWAP */
-struct swap_iocb;
 static inline struct swap_cluster_info *swap_cluster_lock(
 	struct swap_info_struct *si, pgoff_t offset, bool irq)
 {
@@ -394,11 +390,11 @@ static inline void folio_put_swap(struct
 {
 }
 
-static inline void swap_read_folio(struct folio *folio, struct swap_iocb **plug)
+static inline void swap_read_folio(struct swap_io_ctx *ctx, struct folio *folio)
 {
 }
 
-static inline void swap_write_unplug(struct swap_iocb *sio)
+static inline void swap_write_submit(struct swap_io_ctx *ctx)
 {
 }
 
@@ -440,8 +436,7 @@ static inline void swap_update_readahead
 {
 }
 
-static inline int swap_writeout(struct folio *folio,
-		struct swap_iocb **swap_plug)
+static inline int swap_writeout(struct swap_io_ctx *ctx, struct folio *folio)
 {
 	return 0;
 }
@@ -487,7 +482,7 @@ static inline unsigned int folio_swap_fl
 
 #endif /* CONFIG_SWAP */
 
-int shmem_writeout(struct folio *folio, struct swap_iocb **plug,
+int shmem_writeout(struct swap_io_ctx *ctx, struct folio *folio,
 		struct list_head *folio_list);
 
 #endif /* _MM_SWAP_H */
--- a/mm/swap_state.c~mm-swap-introduce-struct-swap_io_ctx
+++ a/mm/swap_state.c
@@ -638,9 +638,9 @@ void swap_update_readahead(struct folio
 	}
 }
 
-static struct folio *swap_cache_read_folio(swp_entry_t entry, gfp_t gfp,
-					   struct mempolicy *mpol, pgoff_t ilx,
-					   struct swap_iocb **plug, bool readahead)
+static struct folio *swap_cache_read_folio(struct swap_io_ctx *ctx,
+		swp_entry_t entry, gfp_t gfp, struct mempolicy *mpol,
+		pgoff_t ilx, bool readahead)
 {
 	struct folio *folio;
 
@@ -654,7 +654,7 @@ static struct folio *swap_cache_read_fol
 	if (IS_ERR_OR_NULL(folio))
 		return NULL;
 
-	swap_read_folio(folio, plug);
+	swap_read_folio(ctx, folio);
 	if (readahead) {
 		folio_set_readahead(folio);
 		count_vm_event(SWAP_RA);
@@ -682,6 +682,7 @@ static struct folio *swap_cache_read_fol
 struct folio *swapin_sync(swp_entry_t entry, gfp_t gfp, unsigned long orders,
 			   struct vm_fault *vmf, struct mempolicy *mpol, pgoff_t ilx)
 {
+	struct swap_io_ctx ctx = {};
 	struct folio *folio;
 
 	do {
@@ -694,7 +695,8 @@ struct folio *swapin_sync(swp_entry_t en
 	if (IS_ERR(folio))
 		return folio;
 
-	swap_read_folio(folio, NULL);
+	swap_read_folio(&ctx, folio);
+	swap_read_submit(&ctx);
 	return folio;
 }
 
@@ -704,9 +706,8 @@ struct folio *swapin_sync(swp_entry_t en
  * A failure return means that either the page allocation failed or that
  * the swap entry is no longer in use.
  */
-struct folio *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
-		struct vm_area_struct *vma, unsigned long addr,
-		struct swap_iocb **plug)
+struct folio *read_swap_cache_async(struct swap_io_ctx *ctx, swp_entry_t entry,
+		gfp_t gfp_mask, struct vm_area_struct *vma, unsigned long addr)
 {
 	struct swap_info_struct *si;
 	struct mempolicy *mpol;
@@ -718,13 +719,24 @@ struct folio *read_swap_cache_async(swp_
 		return NULL;
 
 	mpol = get_vma_policy(vma, addr, 0, &ilx);
-	folio = swap_cache_read_folio(entry, gfp_mask, mpol, ilx, plug, false);
+	folio = swap_cache_read_folio(ctx, entry, gfp_mask, mpol, ilx, false);
 	mpol_cond_put(mpol);
 
 	put_swap_device(si);
 	return folio;
 }
 
+static struct folio *swap_cache_read_folio_sync(swp_entry_t entry, gfp_t gfp,
+		struct mempolicy *mpol, pgoff_t ilx)
+{
+	struct swap_io_ctx ctx = {};
+	struct folio *folio;
+
+	folio = swap_cache_read_folio(&ctx, entry, gfp, mpol, ilx, false);
+	swap_read_submit(&ctx);
+	return folio;
+}
+
 static unsigned int __swapin_nr_pages(unsigned long prev_offset,
 				      unsigned long offset,
 				      int hits,
@@ -813,8 +825,8 @@ struct folio *swap_cluster_readahead(swp
 	unsigned long start_offset, end_offset;
 	unsigned long mask;
 	struct swap_info_struct *si = __swap_entry_to_info(entry);
+	struct swap_io_ctx ctx = {};
 	struct blk_plug plug;
-	struct swap_iocb *splug = NULL;
 	swp_entry_t ra_entry;
 
 	mask = swapin_nr_pages(offset) - 1;
@@ -833,17 +845,16 @@ struct folio *swap_cluster_readahead(swp
 	for (offset = start_offset; offset <= end_offset ; offset++) {
 		/* Ok, do the async read-ahead now */
 		ra_entry = swp_entry(swp_type(entry), offset);
-		folio = swap_cache_read_folio(ra_entry, gfp_mask, mpol, ilx,
-					      &splug, offset != entry_offset);
+		folio = swap_cache_read_folio(&ctx, ra_entry, gfp_mask, mpol,
+				ilx, offset != entry_offset);
 		if (!folio)
 			continue;
 		folio_put(folio);
 	}
 	blk_finish_plug(&plug);
-	swap_read_unplug(splug);
+	swap_read_submit(&ctx);
 skip:
-	/* The page was likely read above, so no need for plugging here */
-	return swap_cache_read_folio(entry, gfp_mask, mpol, ilx, NULL, false);
+	return swap_cache_read_folio_sync(entry, gfp_mask, mpol, ilx);
 }
 
 static int swap_vma_ra_win(struct vm_fault *vmf, unsigned long *start,
@@ -903,8 +914,8 @@ static int swap_vma_ra_win(struct vm_fau
 static struct folio *swap_vma_readahead(swp_entry_t targ_entry, gfp_t gfp_mask,
 		struct mempolicy *mpol, pgoff_t targ_ilx, struct vm_fault *vmf)
 {
+	struct swap_io_ctx ctx = {};
 	struct blk_plug plug;
-	struct swap_iocb *splug = NULL;
 	struct folio *folio;
 	pte_t *pte = NULL, pentry;
 	int win;
@@ -943,8 +954,8 @@ static struct folio *swap_vma_readahead(
 			if (!si)
 				continue;
 		}
-		folio = swap_cache_read_folio(entry, gfp_mask, mpol, ilx,
-					      &splug, addr != vmf->address);
+		folio = swap_cache_read_folio(&ctx, entry, gfp_mask, mpol, ilx,
+					      addr != vmf->address);
 		if (si)
 			put_swap_device(si);
 		if (!folio)
@@ -954,12 +965,10 @@ static struct folio *swap_vma_readahead(
 	if (pte)
 		pte_unmap(pte);
 	blk_finish_plug(&plug);
-	swap_read_unplug(splug);
+	swap_read_submit(&ctx);
 skip:
 	/* The folio was likely read above, so no need for plugging here */
-	folio = swap_cache_read_folio(targ_entry, gfp_mask, mpol, targ_ilx,
-				      NULL, false);
-	return folio;
+	return swap_cache_read_folio_sync(targ_entry, gfp_mask, mpol, targ_ilx);
 }
 
 /**
--- a/mm/vmscan.c~mm-swap-introduce-struct-swap_io_ctx
+++ a/mm/vmscan.c
@@ -617,8 +617,8 @@ typedef enum {
 /*
  * pageout is called by shrink_folio_list() for each dirty folio.
  */
-static pageout_t pageout(struct folio *folio, struct address_space *mapping,
-			 struct swap_iocb **plug, struct list_head *folio_list)
+static pageout_t pageout(struct swap_io_ctx *ctx, struct address_space *mapping,
+		struct folio *folio, struct list_head *folio_list)
 {
 	int res;
 
@@ -654,9 +654,9 @@ static pageout_t pageout(struct folio *f
 	 * the split out folios get added back to folio_list.
 	 */
 	if (shmem_mapping(mapping))
-		res = shmem_writeout(folio, plug, folio_list);
+		res = shmem_writeout(ctx, folio, folio_list);
 	else
-		res = swap_writeout(folio, plug);
+		res = swap_writeout(ctx, folio);
 
 	if (res < 0)
 		handle_write_error(mapping, folio, res);
@@ -1066,7 +1066,7 @@ static unsigned int shrink_folio_list(st
 	unsigned int nr_reclaimed = 0, nr_demoted = 0;
 	unsigned int pgactivate = 0;
 	bool do_demote_pass;
-	struct swap_iocb *plug = NULL;
+	struct swap_io_ctx ctx = {};
 
 	folio_batch_init(&free_folios);
 	memset(stat, 0, sizeof(*stat));
@@ -1394,7 +1394,7 @@ retry:
 			 * starts and then write it out here.
 			 */
 			try_to_unmap_flush_dirty();
-			switch (pageout(folio, mapping, &plug, folio_list)) {
+			switch (pageout(&ctx, mapping, folio, folio_list)) {
 			case PAGE_KEEP:
 				goto keep_locked;
 			case PAGE_ACTIVATE:
@@ -1582,8 +1582,7 @@ keep:
 	list_splice(&ret_folios, folio_list);
 	count_vm_events(PGACTIVATE, pgactivate);
 
-	if (plug)
-		swap_write_unplug(plug);
+	swap_write_submit(&ctx);
 	return nr_reclaimed;
 }
 
--- a/mm/zswap.c~mm-swap-introduce-struct-swap_io_ctx
+++ a/mm/zswap.c
@@ -992,6 +992,7 @@ static int zswap_writeback_entry(struct
 	struct folio *folio;
 	struct mempolicy *mpol;
 	struct swap_info_struct *si;
+	struct swap_io_ctx ctx = {};
 	int ret = 0;
 
 	/* try to allocate swap cache folio */
@@ -1049,7 +1050,8 @@ static int zswap_writeback_entry(struct
 	folio_set_reclaim(folio);
 
 	/* start writeback */
-	__swap_writepage(folio, NULL);
+	__swap_writepage(&ctx, folio);
+	swap_write_submit(&ctx);
 
 out:
 	if (ret) {
_

Patches currently in -mm which might be from hch@lst.de are