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authorEric Biggers <ebiggers@google.com>2016-10-12 23:24:51 -0400
committerTheodore Ts'o <tytso@mit.edu>2016-10-12 23:24:51 -0400
commitc4704a4fbe834eee4109ca064131d440941f6235 (patch)
treea5f4bccc9c151ba68bca4a090704451fb6b95d98 /fs/ext4/sysfs.c
parent559cce698eaf4ccecb2213b2519ea3a0413e5155 (diff)
ext4: do not advertise encryption support when disabled
The sysfs file /sys/fs/ext4/features/encryption was present on kernels compiled with CONFIG_EXT4_FS_ENCRYPTION=n. This was misleading because such kernels do not actually support ext4 encryption. Therefore, only provide this file on kernels compiled with CONFIG_EXT4_FS_ENCRYPTION=y. Note: since the ext4 feature files are all hardcoded to have a contents of "supported", it really is the presence or absence of the file that is significant, not the contents (and this change reflects that). Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@vger.kernel.org
Diffstat (limited to 'fs/ext4/sysfs.c')
-rw-r--r--fs/ext4/sysfs.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
index 73bcfd41f5f2..42145be5c6b4 100644
--- a/fs/ext4/sysfs.c
+++ b/fs/ext4/sysfs.c
@@ -223,14 +223,18 @@ static struct attribute *ext4_attrs[] = {
EXT4_ATTR_FEATURE(lazy_itable_init);
EXT4_ATTR_FEATURE(batched_discard);
EXT4_ATTR_FEATURE(meta_bg_resize);
+#ifdef CONFIG_EXT4_FS_ENCRYPTION
EXT4_ATTR_FEATURE(encryption);
+#endif
EXT4_ATTR_FEATURE(metadata_csum_seed);
static struct attribute *ext4_feat_attrs[] = {
ATTR_LIST(lazy_itable_init),
ATTR_LIST(batched_discard),
ATTR_LIST(meta_bg_resize),
+#ifdef CONFIG_EXT4_FS_ENCRYPTION
ATTR_LIST(encryption),
+#endif
ATTR_LIST(metadata_csum_seed),
NULL,
};