linux-ext4 - [PATCH] ext4: Disallow modifying DAX inode flag if inline

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Date:   Fri, 28 Aug 2020 15:15:01 +0800
From:   Xiao Yang <yangx.jy@...fujitsu.com>
To:     <linux-ext4@...r.kernel.org>
CC:     <darrick.wong@...cle.com>, <ira.weiny@...el.com>, <tytso@....edu>,
        <jack@...e.cz>, Xiao Yang <yangx.jy@...fujitsu.com>
Subject: [PATCH] ext4: Disallow modifying DAX inode flag if inline_data has been set

inline_data is mutually exclusive to DAX so enabling both of them triggers
the following issue:
------------------------------------------
# mkfs.ext4 -F -O inline_data /dev/pmem1
...
# mount /dev/pmem1 /mnt
# echo 'test' >/mnt/file
# lsattr -l /mnt/file
/mnt/file                    Inline_Data
# xfs_io -c "chattr +x" /mnt/file
# xfs_io -c "lsattr -v" /mnt/file
[dax] /mnt/file
# umount /mnt
# mount /dev/pmem1 /mnt
# cat /mnt/file
cat: /mnt/file: Numerical result out of range
------------------------------------------

Signed-off-by: Xiao Yang <yangx.jy@...fujitsu.com>
---
 fs/ext4/ext4.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 523e00d7b392..69187b6205b2 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -492,7 +492,7 @@ struct flex_groups {
 
 /* Flags which are mutually exclusive to DAX */
 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
-			   EXT4_JOURNAL_DATA_FL)
+			   EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
 
 /* Mask out flags that are inappropriate for the given type of inode. */
 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
-- 
2.25.1