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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>
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 V1 2/9] fs/ext4: Disallow verity if inode is DAX
Date: Wed, 13 May 2020 23:53:08 -0700	[thread overview]
Message-ID: <20200514065316.2500078-3-ira.weiny@intel.com> (raw)
In-Reply-To: <20200514065316.2500078-1-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.)

Signed-off-by: Ira Weiny <ira.weiny@intel.com>

---
Changes:
	remove WARN_ON_ONCE
	Add documentation for DAX/Verity exclusivity
---
 Documentation/filesystems/ext4/verity.rst | 7 +++++++
 fs/ext4/verity.c                          | 3 +++
 2 files changed, 10 insertions(+)

diff --git a/Documentation/filesystems/ext4/verity.rst b/Documentation/filesystems/ext4/verity.rst
index 3e4c0ee0e068..51ab1aa17e59 100644
--- a/Documentation/filesystems/ext4/verity.rst
+++ b/Documentation/filesystems/ext4/verity.rst
@@ -39,3 +39,10 @@ is encrypted as well as the data itself.
 
 Verity files cannot have blocks allocated past the end of the verity
 metadata.
+
+Verity and DAX
+--------------
+
+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:[~2020-05-14  6:54 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-14  6:53 [PATCH V1 0/9] Enable ext4 support for per-file/directory DAX operations ira.weiny
2020-05-14  6:53 ` [PATCH V1 1/9] fs/ext4: Narrow scope of DAX check in setflags ira.weiny
2020-05-14  6:53 ` ira.weiny [this message]
2020-05-14 10:21   ` [PATCH V1 2/9] fs/ext4: Disallow verity if inode is DAX Jan Kara
2020-05-14  6:53 ` [PATCH V1 3/9] fs/ext4: Disallow encryption " ira.weiny
2020-05-14 10:23   ` Jan Kara
2020-05-14  6:53 ` [PATCH V1 4/9] fs/ext4: Change EXT4_MOUNT_DAX to EXT4_MOUNT_DAX_ALWAYS ira.weiny
2020-05-14  6:53 ` [PATCH V1 5/9] fs/ext4: Update ext4_should_use_dax() ira.weiny
2020-05-14  6:53 ` [PATCH V1 6/9] fs/ext4: Only change S_DAX on inode load ira.weiny
2020-05-14  6:53 ` [PATCH V1 7/9] fs/ext4: Make DAX mount option a tri-state ira.weiny
2020-05-14 11:25   ` Jan Kara
2020-05-14 14:27     ` Ira Weiny
2020-05-14 15:08   ` Darrick J. Wong
2020-05-15  3:38     ` Ira Weiny
2020-05-14  6:53 ` [PATCH V1 8/9] fs/ext4: Introduce DAX inode flag ira.weiny
2020-05-14 11:06   ` Jan Kara
2020-05-14  6:53 ` [PATCH V1 9/9] Documentation/dax: Update DAX enablement for ext4 ira.weiny
2020-05-14 11:15   ` Jan Kara

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