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From: Boris Burkov <boris@bur.io>
To: linux-btrfs@vger.kernel.org, kernel-team@fb.com,
	linux-fscrypt@vger.kernel.org
Subject: [PATCH v3 4/5] btrfs: fallback to buffered io for verity files
Date: Thu,  8 Apr 2021 11:33:55 -0700
Message-ID: <f532399163803a1955acdff27926fa74ebb763c5.1617900170.git.boris@bur.io> (raw)
In-Reply-To: <cover.1617900170.git.boris@bur.io>

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(+)

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;
 
-- 
2.30.2


  parent reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-08 18:33 [PATCH v3 0/5] btrfs: support fsverity Boris Burkov
2021-04-08 18:33 ` [PATCH v3 1/5] btrfs: add compat_flags to btrfs_inode_item Boris Burkov
2021-04-08 23:40   ` Anand Jain
2021-04-09 18:20     ` Boris Burkov
2021-04-08 18:33 ` [PATCH v3 2/5] btrfs: initial fsverity support Boris Burkov
2021-04-08 22:38   ` kernel test robot
2021-04-08 22:50   ` Eric Biggers
2021-04-09 18:05     ` Boris Burkov
2021-04-09 23:25       ` Eric Biggers
2021-04-09 22:45     ` Boris Burkov
2021-04-09 23:32       ` Eric Biggers
2021-05-03 18:46         ` Boris Burkov
2021-04-08 22:56   ` kernel test robot
2021-04-08 23:19   ` kernel test robot
2021-04-08 18:33 ` [PATCH v3 3/5] btrfs: check verity for reads of inline extents and holes Boris Burkov
2021-04-08 18:33 ` Boris Burkov [this message]
2021-04-08 18:33 ` [PATCH v3 5/5] btrfs: verity metadata orphan items Boris Burkov

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