[PATCH] f2fs: clean up vm_map_ram() call

[Daeho Jeong <daeho43@gmail.com>]

From: Daeho Jeong <daehojeong@google.com>

Made f2fs_vmap() wrapper to handle vm_map_ram() stuff.

Signed-off-by: Daeho Jeong <daehojeong@google.com>
---
 fs/f2fs/compress.c | 42 ++++++++++++++++++------------------------
 1 file changed, 18 insertions(+), 24 deletions(-)

diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index 357303d8514b..7895186cc765 100644
--- a/fs/f2fs/compress.c
+++ b/fs/f2fs/compress.c
@@ -557,6 +557,20 @@ static void f2fs_compress_free_page(struct page *page)
 
 #define MAX_VMAP_RETRIES	3
 
+static void *f2fs_vmap(struct page **pages, unsigned int count)
+{
+	int i;
+	void *buf = NULL;
+
+	for (i = 0; i < MAX_VMAP_RETRIES; i++) {
+		buf = vm_map_ram(pages, count, -1);
+		if (buf)
+			break;
+		vm_unmap_aliases();
+	}
+	return buf;
+}
+
 static int f2fs_compress_pages(struct compress_ctx *cc)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
@@ -593,23 +607,13 @@ static int f2fs_compress_pages(struct compress_ctx *cc)
 		}
 	}
 
-	for (i = 0; i < MAX_VMAP_RETRIES; i++) {
-		cc->rbuf = vm_map_ram(cc->rpages, cc->cluster_size, -1);
-		if (cc->rbuf)
-			break;
-		vm_unmap_aliases();
-	}
+	cc->rbuf = f2fs_vmap(cc->rpages, cc->cluster_size);
 	if (!cc->rbuf) {
 		ret = -ENOMEM;
 		goto out_free_cpages;
 	}
 
-	for (i = 0; i < MAX_VMAP_RETRIES; i++) {
-		cc->cbuf = vm_map_ram(cc->cpages, cc->nr_cpages, -1);
-		if (cc->cbuf)
-			break;
-		vm_unmap_aliases();
-	}
+	cc->cbuf = f2fs_vmap(cc->cpages, cc->nr_cpages);
 	if (!cc->cbuf) {
 		ret = -ENOMEM;
 		goto out_vunmap_rbuf;
@@ -728,23 +732,13 @@ void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
 			goto out_free_dic;
 	}
 
-	for (i = 0; i < MAX_VMAP_RETRIES; i++) {
-		dic->rbuf = vm_map_ram(dic->tpages, dic->cluster_size, -1);
-		if (dic->rbuf)
-			break;
-		vm_unmap_aliases();
-	}
+	dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
 	if (!dic->rbuf) {
 		ret = -ENOMEM;
 		goto destroy_decompress_ctx;
 	}
 
-	for (i = 0; i < MAX_VMAP_RETRIES; i++) {
-		dic->cbuf = vm_map_ram(dic->cpages, dic->nr_cpages, -1);
-		if (dic->cbuf)
-			break;
-		vm_unmap_aliases();
-	}
+	dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
 	if (!dic->cbuf) {
 		ret = -ENOMEM;
 		goto out_vunmap_rbuf;
-- 
2.28.0.526.ge36021eeef-goog