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From: ira.weiny@intel.com
To: linux-ext4@vger.kernel.org,
	Andreas Dilger <adilger.kernel@dilger.ca>,
	"Theodore Y. Ts'o" <tytso@mit.edu>, Jan Kara <jack@suse.cz>,
	Eric Biggers <ebiggers@kernel.org>
Cc: Ira Weiny <ira.weiny@intel.com>,
	Al Viro <viro@zeniv.linux.org.uk>,
	Dan Williams <dan.j.williams@intel.com>,
	Dave Chinner <david@fromorbit.com>,
	Christoph Hellwig <hch@lst.de>, Jeff Moyer <jmoyer@redhat.com>,
	"Darrick J. Wong" <darrick.wong@oracle.com>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH V3 2/8] fs/ext4: Disallow verity if inode is DAX
Date: Tue, 19 May 2020 22:57:47 -0700	[thread overview]
Message-ID: <20200520055753.3733520-3-ira.weiny@intel.com> (raw)
In-Reply-To: <20200520055753.3733520-1-ira.weiny@intel.com>

From: Ira Weiny <ira.weiny@intel.com>

Verity and DAX are incompatible.  Changing the DAX mode due to a verity
flag change is wrong without a corresponding address_space_operations
update.

Make the 2 options mutually exclusive by returning an error if DAX was
set first.

(Setting DAX is already disabled if Verity is set first.)

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>

---
Changes from V2:
	Remove Section title 'Verity and DAX'

Changes:
	remove WARN_ON_ONCE
	Add documentation for DAX/Verity exclusivity
---
 Documentation/filesystems/ext4/verity.rst | 3 +++
 fs/ext4/verity.c                          | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/Documentation/filesystems/ext4/verity.rst b/Documentation/filesystems/ext4/verity.rst
index 3e4c0ee0e068..e99ff3fd09f7 100644
--- a/Documentation/filesystems/ext4/verity.rst
+++ b/Documentation/filesystems/ext4/verity.rst
@@ -39,3 +39,6 @@ is encrypted as well as the data itself.
 
 Verity files cannot have blocks allocated past the end of the verity
 metadata.
+
+Verity and DAX are not compatible and attempts to set both of these flags
+on a file will fail.
diff --git a/fs/ext4/verity.c b/fs/ext4/verity.c
index dc5ec724d889..f05a09fb2ae4 100644
--- a/fs/ext4/verity.c
+++ b/fs/ext4/verity.c
@@ -113,6 +113,9 @@ static int ext4_begin_enable_verity(struct file *filp)
 	handle_t *handle;
 	int err;
 
+	if (IS_DAX(inode))
+		return -EINVAL;
+
 	if (ext4_verity_in_progress(inode))
 		return -EBUSY;
 
-- 
2.25.1


  parent reply	other threads:[~2020-05-20  5:58 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-20  5:57 [PATCH V3 0/8] Enable ext4 support for per-file/directory DAX operations ira.weiny
2020-05-20  5:57 ` [PATCH V3 1/8] fs/ext4: Narrow scope of DAX check in setflags ira.weiny
2020-05-20  5:57 ` ira.weiny [this message]
2020-05-20  5:57 ` [PATCH V3 3/8] fs/ext4: Change EXT4_MOUNT_DAX to EXT4_MOUNT_DAX_ALWAYS ira.weiny
2020-05-20  5:57 ` [PATCH V3 4/8] fs/ext4: Update ext4_should_use_dax() ira.weiny
2020-05-20 13:37   ` Jan Kara
2020-05-20 19:40     ` Ira Weiny
2020-05-21 10:24       ` Jan Kara
2020-05-20  5:57 ` [PATCH V3 5/8] fs/ext4: Only change S_DAX on inode load ira.weiny
2020-05-20  5:57 ` [PATCH V3 6/8] fs/ext4: Make DAX mount option a tri-state ira.weiny
2020-05-20  5:57 ` [PATCH V3 7/8] fs/ext4: Introduce DAX inode flag ira.weiny
2020-05-20 14:11   ` Jan Kara
2020-05-20 18:34     ` Ira Weiny
2020-05-20 19:26   ` Andreas Dilger
2020-05-20 20:02     ` Ira Weiny
2020-05-20 20:55       ` Darrick J. Wong
2020-05-21  0:57         ` Andreas Dilger
2020-05-20  5:57 ` [PATCH V3 8/8] Documentation/dax: Update DAX enablement for ext4 ira.weiny

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