Re: [syzbot] [ext4?] INFO: task hung in filename_unlinkat

[Edward Adam Davis <eadavis@qq.com>]

#syz test

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index ae3804f36535..4779da94f816 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4457,9 +4457,13 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
 	path = ext4_ext_insert_extent(handle, inode, path, &newex, flags);
 	if (IS_ERR(path)) {
 		err = PTR_ERR(path);
-		if (allocated_clusters) {
+		/*
+		 * Gracefully handle out of space conditions. If the filesystem
+		 * is inconsistent, we'll just leak allocated blocks to avoid
+		 * causing even more damage.
+		 */
+		if (allocated_clusters && (err == -EDQUOT || err == -ENOSPC)) {
 			int fb_flags = 0;
-
 			/*
 			 * free data blocks we just allocated.
 			 * not a good idea to call discard here directly,