[PATCH v3 4/5] f2fs: use the updated test_dummy_encryption helper functions

Eric Biggers
2022-05-13T23:23:28Z

From: Eric Biggers <ebiggers@google.com>

Switch f2fs over to the functions that are replacing
fscrypt_set_test_dummy_encryption(). Since f2fs hasn't been converted
to the new mount API yet, this doesn't really provide a benefit for
f2fs. But it allows fscrypt_set_test_dummy_encryption() to be removed.

Also take the opportunity to eliminate an #ifdef.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
fs/f2fs/super.c | 29 +++++++++++++++++++++--------
1 file changed, 21 insertions(+), 8 deletions(-)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 6f69491aa5731..c08cbe0dfcd85 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -8,6 +8,7 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
+#include <linux/fs_context.h>
#include <linux/sched/mm.h>
#include <linux/statfs.h>
#include <linux/buffer_head.h>
@@ -492,9 +493,19 @@ static int f2fs_set_test_dummy_encryption(struct super_block *sb,
bool is_remount)
{
struct f2fs_sb_info *sbi = F2FS_SB(sb);
-#ifdef CONFIG_FS_ENCRYPTION
+ struct fs_parameter param = {
+ .type = fs_value_is_string,
+ .string = arg->from ? arg->from : "",
+ };
+ struct fscrypt_dummy_policy *policy =
+ &F2FS_OPTION(sbi).dummy_enc_policy;
int err;

+ if (!IS_ENABLED(CONFIG_FS_ENCRYPTION)) {
+ f2fs_warn(sbi, "test_dummy_encryption option not supported");
+ return -EINVAL;
+ }
+
if (!f2fs_sb_has_encrypt(sbi)) {
f2fs_err(sbi, "Encrypt feature is off");
return -EINVAL;
@@ -506,12 +517,12 @@ static int f2fs_set_test_dummy_encryption(struct super_block *sb,
* needed to allow it to be set or changed during remount. We do allow
* it to be specified during remount, but only if there is no change.
*/
- if (is_remount && !F2FS_OPTION(sbi).dummy_enc_policy.policy) {
+ if (is_remount && !fscrypt_is_dummy_policy_set(policy)) {
f2fs_warn(sbi, "Can't set test_dummy_encryption on remount");
return -EINVAL;
}
- err = fscrypt_set_test_dummy_encryption(
- sb, arg->from, &F2FS_OPTION(sbi).dummy_enc_policy);
+
+ err = fscrypt_parse_test_dummy_encryption(&param, policy);
if (err) {
if (err == -EEXIST)
f2fs_warn(sbi,
@@ -524,12 +535,14 @@ static int f2fs_set_test_dummy_encryption(struct super_block *sb,
opt, err);
return -EINVAL;
}
+ err = fscrypt_add_test_dummy_key(sb, policy);
+ if (err) {
+ f2fs_warn(sbi, "Error adding test dummy encryption key [%d]",
+ err);
+ return err;
+ }
f2fs_warn(sbi, "Test dummy encryption mode enabled");
return 0;
-#else
- f2fs_warn(sbi, "test_dummy_encryption option not supported");
- return -EINVAL;
-#endif
}

#ifdef CONFIG_F2FS_FS_COMPRESSION
--
2.36.1