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[v3,4/5] btrfs: fallback to buffered io for verity files

Message ID f532399163803a1955acdff27926fa74ebb763c5.1617900170.git.boris@bur.io (mailing list archive)
State New
Headers show
Series btrfs: support fsverity | expand

Commit Message

Boris Burkov April 8, 2021, 6:33 p.m. UTC
Reading the contents with direct IO would circumvent verity checks, so
fallback to buffered reads. For what it's worth, this is how ext4
handles it as well.

Signed-off-by: Boris Burkov <boris@bur.io>
 fs/btrfs/file.c | 3 +++
 1 file changed, 3 insertions(+)
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diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index e8dcada0d239..9f8d90bbbe26 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -3613,6 +3613,9 @@  static ssize_t btrfs_direct_read(struct kiocb *iocb, struct iov_iter *to)
 	struct inode *inode = file_inode(iocb->ki_filp);
 	ssize_t ret;
+	if (fsverity_active(inode))
+		return 0;
 	if (check_direct_read(btrfs_sb(inode->i_sb), to, iocb->ki_pos))
 		return 0;