From: Darrick J. Wong <djwong@kernel.org>
Date: Thu, 24 Apr 2025 21:41:02 +0000 (-0700)
Subject: fuse2fs: refuse unsupported features
X-Git-Tag: archive/debian/1.47.2-2~19
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=746811f345bfd906182cd540b3c3b64846294199;p=thirdparty%2Fe2fsprogs.git

fuse2fs: refuse unsupported features

Don't mount a filesystem with superblock features that we don't actually
know how to support.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/174553064943.1160461.14810321477577468832.stgit@frogsfrogsfrogs
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
(cherry picked from commit ccbc6f24fed095b28f9faa7b575159e49787fae0)
---

diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
index a6390ab5..2e046320 100644
--- a/misc/fuse2fs.c
+++ b/misc/fuse2fs.c
@@ -3863,6 +3863,26 @@ int main(int argc, char *argv[])
 
 	ret = 3;
 
+	if (ext2fs_has_feature_quota(global_fs->super)) {
+		printf(_("%s: quotas not supported."), fctx.device);
+		goto out;
+	}
+	if (ext2fs_has_feature_verity(global_fs->super)) {
+		printf(_("%s: verity not supported."), fctx.device);
+		goto out;
+	}
+	if (ext2fs_has_feature_encrypt(global_fs->super)) {
+		printf(_("%s: encryption not supported."), fctx.device);
+		goto out;
+	}
+	if (ext2fs_has_feature_casefold(global_fs->super)) {
+		printf(_("%s: casefolding not supported."), fctx.device);
+		goto out;
+	}
+
+	if (ext2fs_has_feature_shared_blocks(global_fs->super))
+		fctx.ro = 1;
+
 	if (ext2fs_has_feature_journal_needs_recovery(global_fs->super)) {
 		if (fctx.norecovery) {
 			printf(_("%s: mounting read-only without "