[RFC PATCH 1/9] ext4: add deprecation warning for inline_data feature

[Yun Zhou <yun.zhou@windriver.com>]

Emit a mount-time warning when the inline_data feature is enabled,
directing users to convert their filesystems with tune2fs.

Signed-off-by: Yun Zhou <yun.zhou@windriver.com>
---
 fs/ext4/super.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 6c18b5adffca..9913e30b7040 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3145,6 +3145,12 @@ static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
 		ext4_msg(sb, KERN_WARNING,
 			 "warning: checktime reached, "
 			 "running e2fsck is recommended");
+	if (ext4_has_feature_inline_data(sb))
+		ext4_msg(sb, KERN_WARNING,
+			 "warning: inline_data feature is deprecated and "
+			 "will be removed in a future kernel release. "
+			 "Use 'tune2fs -O ^inline_data' to convert.");
+
 	if (!sbi->s_journal)
 		es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
 	if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
-- 
2.43.0