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-rw-r--r--fs/cachefiles/cache.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/cachefiles/cache.c b/fs/cachefiles/cache.c
index 2b2879c5d1d2..7077f72e6f47 100644
--- a/fs/cachefiles/cache.c
+++ b/fs/cachefiles/cache.c
@@ -51,6 +51,7 @@ int cachefiles_add_cache(struct cachefiles_cache *cache)
/* Check features of the backing filesystem:
* - Directories must support looking up and directory creation
+ * - We create tmpfiles to handle invalidation
* - We use xattrs to store metadata
* - We need to be able to query the amount of space available
* - We want to be able to sync the filesystem when stopping the cache
@@ -60,6 +61,7 @@ int cachefiles_add_cache(struct cachefiles_cache *cache)
if (d_is_negative(root) ||
!d_backing_inode(root)->i_op->lookup ||
!d_backing_inode(root)->i_op->mkdir ||
+ !d_backing_inode(root)->i_op->tmpfile ||
!(d_backing_inode(root)->i_opflags & IOP_XATTR) ||
!root->d_sb->s_op->statfs ||
!root->d_sb->s_op->sync_fs ||