1 files changed, 15 insertions, 5 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 9e23ffea7f54..b34d32fdaaec 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3235,7 +3235,8 @@ int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode,
                                 u64 bytes)
 {
         struct btrfs_space_info *data_sinfo;
-        int ret = 0, committed = 0;
+        u64 used;
+        int ret = 0, committed = 0, flushed = 0;
 
         /* make sure bytes are sectorsize aligned */
         bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
@@ -3247,12 +3248,21 @@ int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode,
 again:
         /* make sure we have enough space to handle the data first */
         spin_lock(&data_sinfo->lock);
-        if (data_sinfo->total_bytes - data_sinfo->bytes_used -
-            data_sinfo->bytes_delalloc - data_sinfo->bytes_reserved -
-            data_sinfo->bytes_pinned - data_sinfo->bytes_readonly -
-            data_sinfo->bytes_may_use - data_sinfo->bytes_super < bytes) {
+        used = data_sinfo->bytes_used + data_sinfo->bytes_delalloc +
+                data_sinfo->bytes_reserved + data_sinfo->bytes_pinned +
+                data_sinfo->bytes_readonly + data_sinfo->bytes_may_use +
+                data_sinfo->bytes_super;
+
+        if (used + bytes > data_sinfo->total_bytes) {
                 struct btrfs_trans_handle *trans;
 
+                if (!flushed) {
+                        spin_unlock(&data_sinfo->lock);
+                        flush_delalloc(root, data_sinfo);
+                        flushed = 1;
+                        goto again;
+                }
+
                 /*
                  * if we don't have enough free bytes in this space then we need
                  * to alloc a new chunk.