Btrfs: remove BUG_ON() in compress_file_range()

It's not a big deal if we fail to allocate the array, and instead of
panic we can just give up compressing.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index f12747c..81d4f68 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -393,7 +393,10 @@ again:
             (BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS))) {
                WARN_ON(pages);
                pages = kzalloc(sizeof(struct page *) * nr_pages, GFP_NOFS);
-               BUG_ON(!pages);
+               if (!pages) {
+                       /* just bail out to the uncompressed code */
+                       goto cont;
+               }
 
                if (BTRFS_I(inode)->force_compress)
                        compress_type = BTRFS_I(inode)->force_compress;
@@ -424,6 +427,7 @@ again:
                        will_compress = 1;
                }
        }
+cont:
        if (start == 0) {
                trans = btrfs_join_transaction(root);
                BUG_ON(IS_ERR(trans));