f2fs crypto: add alloc_bounce_page

This patch adds alloc_bounce_page likewise ext4.

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

diff --git a/fs/f2fs/crypto.c b/fs/f2fs/crypto.c
index 75d62ff..4a62ef1 100644 (file)
--- 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;
 }
 
 /**