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authorIra Weiny <ira.weiny@intel.com>2020-05-28 17:59:56 +0300
committerTheodore Ts'o <tytso@mit.edu>2020-05-29 05:09:47 +0300
commit6c0d077ff8200a7b8e7131ca8e25315dec243a60 (patch)
treea49d7225d9485cde40cf91364e7709b74e541b5b /Documentation/filesystems/ext4
parentff694ab60c29cfeba81b3d5068d3c908f22110ed (diff)
downloadlinux-6c0d077ff8200a7b8e7131ca8e25315dec243a60.tar.xz
fs/ext4: Disallow verity if inode is DAX
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> Link: https://lore.kernel.org/r/20200528150003.828793-3-ira.weiny@intel.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'Documentation/filesystems/ext4')
-rw-r--r--Documentation/filesystems/ext4/verity.rst3
1 files changed, 3 insertions, 0 deletions
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.