btrfs: factor out a btrfs_free_compressed_pages helper

Share the code to free the compressed pages and the array to hold them
into a common helper.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.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/compression.c b/fs/btrfs/compression.c
index 89c9b39..5f64a77 100644 (file)
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -159,30 +159,29 @@ static int compression_decompress(int type, struct list_head *ws,
        }
 }
 
+static void btrfs_free_compressed_pages(struct compressed_bio *cb)
+{
+       for (unsigned int i = 0; i < cb->nr_pages; i++) {
+               struct page *page = cb->compressed_pages[i];
+
+               page->mapping = NULL;
+               put_page(page);
+       }
+       kfree(cb->compressed_pages);
+}
+
 static int btrfs_decompress_bio(struct compressed_bio *cb);
 
 static void end_compressed_bio_read(struct btrfs_bio *bbio)
 {
        struct compressed_bio *cb = to_compressed_bio(bbio);
        blk_status_t status = bbio->bio.bi_status;
-       unsigned int index;
-       struct page *page;
 
        if (!status)
                status = errno_to_blk_status(btrfs_decompress_bio(cb));
 
-       /* Release the compressed pages */
-       for (index = 0; index < cb->nr_pages; index++) {
-               page = cb->compressed_pages[index];
-               page->mapping = NULL;
-               put_page(page);
-       }
-
-       /* Do io completion on the original bio */
+       btrfs_free_compressed_pages(cb);
        btrfs_bio_end_io(btrfs_bio(cb->orig_bio), status);
-
-       /* Finally free the cb struct */
-       kfree(cb->compressed_pages);
        bio_put(&bbio->bio);
 }
 
@@ -227,8 +226,6 @@ static noinline void end_compressed_writeback(const struct compressed_bio *cb)
 
 static void finish_compressed_bio_write(struct compressed_bio *cb)
 {
-       unsigned int index;
-
        /*
         * Ok, we're the last bio for this extent, step one is to call back
         * into the FS and do all the end_io operations.
@@ -241,19 +238,7 @@ static void finish_compressed_bio_write(struct compressed_bio *cb)
                end_compressed_writeback(cb);
        /* Note, our inode could be gone now */
 
-       /*
-        * Release the compressed pages, these came from alloc_page and
-        * are not attached to the inode at all
-        */
-       for (index = 0; index < cb->nr_pages; index++) {
-               struct page *page = cb->compressed_pages[index];
-
-               page->mapping = NULL;
-               put_page(page);
-       }
-
-       /* Finally free the cb struct */
-       kfree(cb->compressed_pages);
+       btrfs_free_compressed_pages(cb);
        bio_put(&cb->bbio.bio);
 }