erofs: get rid of ->lru usage

Currently, ->lru is a way to arrange non-LRU pages and has some
in-kernel users. In order to minimize noticable issues of page
reclaim and cache thrashing under high memory presure, limited
temporary pages were all chained with ->lru and can be reused
during the request. However, it seems that ->lru could be removed
when folio is landing.

Let's use page->private to chain temporary pages for now instead
and transform EROFS formally after the topic of the folio / file
page design is finalized.

Link: https://lore.kernel.org/r/20211022090120.14675-1-hsiangkao@linux.alibaba.com
Cc: Matthew Wilcox <willy@infradead.org>
Reviewed-by: Kent Overstreet <kent.overstreet@gmail.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/fs/erofs/decompressor.c b/fs/erofs/decompressor.c
index 8a624d73c185..a0786b95cdf9 100644
--- a/fs/erofs/decompressor.c
+++ b/fs/erofs/decompressor.c
@@ -57,7 +57,7 @@ int z_erofs_load_lz4_config(struct super_block *sb,
  * all physical pages are consecutive, which can be seen for moderate CR.
  */
 static int z_erofs_lz4_prepare_dstpages(struct z_erofs_decompress_req *rq,
-					struct list_head *pagepool)
+					struct page **pagepool)
 {
 	const unsigned int nr =
 		PAGE_ALIGN(rq->pageofs_out + rq->outputsize) >> PAGE_SHIFT;
@@ -254,7 +254,7 @@ static int z_erofs_lz4_decompress_mem(struct z_erofs_decompress_req *rq,
 }
 
 static int z_erofs_lz4_decompress(struct z_erofs_decompress_req *rq,
-				  struct list_head *pagepool)
+				  struct page **pagepool)
 {
 	const unsigned int nrpages_out =
 		PAGE_ALIGN(rq->pageofs_out + rq->outputsize) >> PAGE_SHIFT;
@@ -296,7 +296,7 @@ dstmap_out:
 }
 
 static int z_erofs_shifted_transform(struct z_erofs_decompress_req *rq,
-				     struct list_head *pagepool)
+				     struct page **pagepool)
 {
 	const unsigned int nrpages_out =
 		PAGE_ALIGN(rq->pageofs_out + rq->outputsize) >> PAGE_SHIFT;
@@ -352,7 +352,7 @@ static struct z_erofs_decompressor decompressors[] = {
 };
 
 int z_erofs_decompress(struct z_erofs_decompress_req *rq,
-		       struct list_head *pagepool)
+		       struct page **pagepool)
 {
 	return decompressors[rq->alg].decompress(rq, pagepool);
 }