1 files changed, 23 insertions, 1 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 1af069a9a0c7..ee582a36653d 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -395,10 +395,31 @@ static noinline int add_async_extent(struct async_chunk *cow,
         return 0;
 }
 
+/*
+ * Check if the inode has flags compatible with compression
+ */
+static inline bool inode_can_compress(struct inode *inode)
+{
+        if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW ||
+            BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)
+                return false;
+        return true;
+}
+
+/*
+ * Check if the inode needs to be submitted to compression, based on mount
+ * options, defragmentation, properties or heuristics.
+ */
 static inline int inode_need_compress(struct inode *inode, u64 start, u64 end)
 {
         struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
 
+        if (!inode_can_compress(inode)) {
+                WARN(IS_ENABLED(CONFIG_BTRFS_DEBUG),
+                        KERN_ERR "BTRFS: unexpected compression for ino %llu\n",
+                        btrfs_ino(BTRFS_I(inode)));
+                return 0;
+        }
         /* force compress */
         if (btrfs_test_opt(fs_info, FORCE_COMPRESS))
                 return 1;
@@ -1631,7 +1652,8 @@ int btrfs_run_delalloc_range(struct inode *inode, struct page *locked_page,
         } else if (BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC && !force_cow) {
                 ret = run_delalloc_nocow(inode, locked_page, start, end,
                                          page_started, 0, nr_written);
-        } else if (!inode_need_compress(inode, start, end)) {
+        } else if (!inode_can_compress(inode) ||
+                   !inode_need_compress(inode, start, end)) {
                 ret = cow_file_range(inode, locked_page, start, end, end,
                                       page_started, nr_written, 1, NULL);
         } else {