btrfs: fix deadlock when cloning inline extent and low on free metadata space

[platform/kernel/linux-rpi.git] / fs / btrfs / btrfs_inode.h

diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 555cbce..d9bf53d 100644 (file)
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -42,6 +42,15 @@ enum {
         * to an inode.
         */
        BTRFS_INODE_NO_XATTRS,
+       /*
+        * Set when we are in a context where we need to start a transaction and
+        * have dirty pages with the respective file range locked. This is to
+        * ensure that when reserving space for the transaction, if we are low
+        * on available space and need to flush delalloc, we will not flush
+        * delalloc for this inode, because that could result in a deadlock (on
+        * the file range, inode's io_tree).
+        */
+       BTRFS_INODE_NO_DELALLOC_FLUSH,
 };
 
 /* in memory btrfs inode */