btrfs: share the code to free the page array in compress_file_range

compress_file_range has two code blocks to free the page array for the
compressed data.  Share the code using a goto label.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index db0dc22..cda511d 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1004,12 +1004,7 @@ again:
                                                     PAGE_UNLOCK |
                                                     PAGE_START_WRITEBACK |
                                                     PAGE_END_WRITEBACK);
-                       for (i = 0; i < nr_pages; i++) {
-                               WARN_ON(pages[i]->mapping);
-                               put_page(pages[i]);
-                       }
-                       kfree(pages);
-                       return;
+                       goto free_pages;
                }
        }
 
@@ -1045,21 +1040,6 @@ mark_incompressible:
        if (!btrfs_test_opt(fs_info, FORCE_COMPRESS) && !inode->prop_compress)
                inode->flags |= BTRFS_INODE_NOCOMPRESS;
 cleanup_and_bail_uncompressed:
-       if (pages) {
-               /*
-                * the compression code ran but failed to make things smaller,
-                * free any pages it allocated and our page pointer array
-                */
-               for (i = 0; i < nr_pages; i++) {
-                       WARN_ON(pages[i]->mapping);
-                       put_page(pages[i]);
-               }
-               kfree(pages);
-               pages = NULL;
-               total_compressed = 0;
-               nr_pages = 0;
-       }
-
        /*
         * No compression, but we still need to write the pages in the file
         * we've been given so far.  redirty the locked page if it corresponds
@@ -1077,6 +1057,14 @@ cleanup_and_bail_uncompressed:
                extent_range_redirty_for_io(&inode->vfs_inode, start, end);
        add_async_extent(async_chunk, start, end - start + 1, 0, NULL, 0,
                         BTRFS_COMPRESS_NONE);
+free_pages:
+       if (pages) {
+               for (i = 0; i < nr_pages; i++) {
+                       WARN_ON(pages[i]->mapping);
+                       put_page(pages[i]);
+               }
+               kfree(pages);
+       }
 }
 
 static void free_async_extent_pages(struct async_extent *async_extent)