[PATCH v2] erofs: fold in z_erofs_decompress()

[Yue Hu <zbestahu@gmail.com>]

From: Yue Hu <huyue2@coolpad.com>

No need this helper since it's just a simple wrapper for decompress
method and only one caller.  So, let's fold in directly instead.

Signed-off-by: Yue Hu <huyue2@coolpad.com>
---
v2:
 - rename decompressors[] -> erofs_decompressors[]
 - do not copy struct z_erofs_decompressor item

 fs/erofs/compress.h     | 3 +--
 fs/erofs/decompressor.c | 8 +-------
 fs/erofs/zdata.c        | 4 +++-
 3 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/fs/erofs/compress.h b/fs/erofs/compress.h
index 26fa170090b8..b1b846504027 100644
--- a/fs/erofs/compress.h
+++ b/fs/erofs/compress.h
@@ -89,8 +89,7 @@ static inline bool erofs_page_is_managed(const struct erofs_sb_info *sbi,
 
 int z_erofs_fixup_insize(struct z_erofs_decompress_req *rq, const char *padbuf,
 			 unsigned int padbufsize);
-int z_erofs_decompress(struct z_erofs_decompress_req *rq,
-		       struct page **pagepool);
+extern const struct z_erofs_decompressor erofs_decompressors[];
 
 /* prototypes for specific algorithms */
 int z_erofs_lzma_decompress(struct z_erofs_decompress_req *rq,
diff --git a/fs/erofs/decompressor.c b/fs/erofs/decompressor.c
index 7021e2cf6146..2a29943fa5cc 100644
--- a/fs/erofs/decompressor.c
+++ b/fs/erofs/decompressor.c
@@ -363,7 +363,7 @@ static int z_erofs_transform_plain(struct z_erofs_decompress_req *rq,
 	return 0;
 }
 
-static struct z_erofs_decompressor decompressors[] = {
+const struct z_erofs_decompressor erofs_decompressors[] = {
 	[Z_EROFS_COMPRESSION_SHIFTED] = {
 		.decompress = z_erofs_transform_plain,
 		.name = "shifted"
@@ -383,9 +383,3 @@ static struct z_erofs_decompressor decompressors[] = {
 	},
 #endif
 };
-
-int z_erofs_decompress(struct z_erofs_decompress_req *rq,
-		       struct page **pagepool)
-{
-	return decompressors[rq->alg].decompress(rq, pagepool);
-}
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index a90d37c7bdd7..5ef9d3863ff9 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -1290,6 +1290,8 @@ static int z_erofs_decompress_pcluster(struct z_erofs_decompress_backend *be,
 	struct erofs_sb_info *const sbi = EROFS_SB(be->sb);
 	struct z_erofs_pcluster *pcl = be->pcl;
 	unsigned int pclusterpages = z_erofs_pclusterpages(pcl);
+	const struct z_erofs_decompressor *decompressor =
+				&erofs_decompressors[pcl->algorithmformat];
 	unsigned int i, inputsize;
 	int err2;
 	struct page *page;
@@ -1333,7 +1335,7 @@ static int z_erofs_decompress_pcluster(struct z_erofs_decompress_backend *be,
 	else
 		inputsize = pclusterpages * PAGE_SIZE;
 
-	err = z_erofs_decompress(&(struct z_erofs_decompress_req) {
+	err = decompressor->decompress(&(struct z_erofs_decompress_req) {
 					.sb = be->sb,
 					.in = be->compressed_pages,
 					.out = be->decompressed_pages,
-- 
2.17.1