[PATCH 1/2] mke2fs: Warn if page size != blocksize when ecnrypt is enabled

[Lukas Czerner <lczerner@redhat.com>]

With encrypt feature enabled the file system block size must match
system page size. Currently mke2fs will not complain at all when we try
to create a file system that does not satisfy this requirement for the
system. Add a warning for this case.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
---
 misc/mke2fs.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/misc/mke2fs.c b/misc/mke2fs.c
index d7cf257e..aa9590d8 100644
--- a/misc/mke2fs.c
+++ b/misc/mke2fs.c
@@ -2468,6 +2468,26 @@ profile_error:
 		      exit (1);
 	}
 
+	/*
+	 * Encrypt feature requires blocksize to be the same as page size,
+	 * otherwise file system won't mount
+	 */
+	if (ext2fs_has_feature_encrypt(&fs_param) &&
+	   (blocksize != sys_page_size)) {
+		if (!force) {
+			com_err(program_name, 0,
+				_("Encrypt feature is enabled, but block size "
+				  "(%dB) does not match system page size "
+				  "(%dB)"),
+				blocksize, sys_page_size);
+			proceed_question(proceed_delay);
+		}
+		fprintf(stderr,_("Warning: Encrypt feature enabled, but block "
+				 "size (%dB) does not match system page size "
+				 "(%dB), forced to continue\n"),
+			blocksize, sys_page_size);
+	}
+
 	/* Don't allow user to set both metadata_csum and uninit_bg bits. */
 	if (ext2fs_has_feature_metadata_csum(&fs_param) &&
 	    ext2fs_has_feature_gdt_csum(&fs_param))
-- 
2.21.0