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fs/ext4: Disallow verity if inode is DAX

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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>
This commit is contained in:
Ira Weiny
2020-05-28 07:59:56 -07:00
committed by Theodore Ts'o
parent ff694ab60c
commit 6c0d077ff8
2 changed files with 6 additions and 0 deletions
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fs/ext4/verity.c
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@@ -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;