fs-verity: add data verification hooks for ->readpages()
Add functions that verify data pages that have been read from a
fs-verity file, against that file's Merkle tree. These will be called
from filesystems' ->readpage() and ->readpages() methods.
Since data verification can block, a workqueue is provided for these
methods to enqueue verification work from their bio completion callback.
See the "Verifying data" section of
Documentation/filesystems/fsverity.rst for more information.
Reviewed-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
diff --git a/fs/verity/open.c b/fs/verity/open.c
index 2cb2fe8..3636a1ed 100644
--- a/fs/verity/open.c
+++ b/fs/verity/open.c
@@ -337,3 +337,9 @@ int __init fsverity_init_info_cache(void)
return -ENOMEM;
return 0;
}
+
+void __init fsverity_exit_info_cache(void)
+{
+ kmem_cache_destroy(fsverity_info_cachep);
+ fsverity_info_cachep = NULL;
+}