f2fs crypto: add alloc_bounce_page

This patch adds alloc_bounce_page likewise ext4.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 15 insertions, 8 deletions

diff --git a/fs/f2fs/crypto.c b/fs/f2fs/crypto.c
index 75d62fff8960..4a62ef14e932 100644
--- a/fs/f2fs/crypto.c
+++ b/fs/f2fs/crypto.c
@@ -376,6 +376,15 @@ static int f2fs_page_crypto(struct f2fs_crypto_ctx *ctx,
         return 0;
 }
 
+static struct page *alloc_bounce_page(struct f2fs_crypto_ctx *ctx)
+{
+        ctx->w.bounce_page = mempool_alloc(f2fs_bounce_page_pool, GFP_NOWAIT);
+        if (ctx->w.bounce_page == NULL)
+                return ERR_PTR(-ENOMEM);
+        ctx->flags |= F2FS_WRITE_PATH_FL;
+        return ctx->w.bounce_page;
+}
+
 /**
  * f2fs_encrypt() - Encrypts a page
  * @inode:          The inode for which the encryption should take place
@@ -405,19 +414,17 @@ struct page *f2fs_encrypt(struct inode *inode,
                 return (struct page *)ctx;
 
         /* The encryption operation will require a bounce page. */
-        ciphertext_page = mempool_alloc(f2fs_bounce_page_pool, GFP_NOWAIT);
-        if (!ciphertext_page) {
-                err = -ENOMEM;
+        ciphertext_page = alloc_bounce_page(ctx);
+        if (IS_ERR(ciphertext_page))
                 goto err_out;
-        }
 
-        ctx->flags |= F2FS_WRITE_PATH_FL;
-        ctx->w.bounce_page = ciphertext_page;
         ctx->w.control_page = plaintext_page;
         err = f2fs_page_crypto(ctx, inode, F2FS_ENCRYPT, plaintext_page->index,
                                         plaintext_page, ciphertext_page);
-        if (err)
+        if (err) {
+                ciphertext_page = ERR_PTR(err);
                 goto err_out;
+        }
 
         SetPagePrivate(ciphertext_page);
         set_page_private(ciphertext_page, (unsigned long)ctx);
@@ -426,7 +433,7 @@ struct page *f2fs_encrypt(struct inode *inode,
 
 err_out:
         f2fs_release_crypto_ctx(ctx);
-        return ERR_PTR(err);
+        return ciphertext_page;
 }
 
 /**