[PATCH v7 14/16] f2fs: wire up new fscrypt ioctls

[Eric Biggers <ebiggers@kernel.org>]

From: Eric Biggers <ebiggers@google.com>

Wire up the new ioctls for adding and removing fscrypt keys to/from the
filesystem, and the new ioctl for retrieving v2 encryption policies.

FS_IOC_REMOVE_ENCRYPTION_KEY also required making f2fs_drop_inode() call
fscrypt_drop_inode().

For more details see Documentation/filesystems/fscrypt.rst and the
fscrypt patches that added the implementation of these ioctls.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/f2fs/file.c  | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 fs/f2fs/super.c |  2 ++
 2 files changed, 48 insertions(+)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index f8d46df8fa9ee..d81dda290b829 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -2184,6 +2184,40 @@ static int f2fs_ioc_get_encryption_pwsalt(struct file *filp, unsigned long arg)
 	return err;
 }
 
+static int f2fs_ioc_get_encryption_policy_ex(struct file *filp,
+					     unsigned long arg)
+{
+	if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
+		return -EOPNOTSUPP;
+
+	return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg);
+}
+
+static int f2fs_ioc_add_encryption_key(struct file *filp, unsigned long arg)
+{
+	if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
+		return -EOPNOTSUPP;
+
+	return fscrypt_ioctl_add_key(filp, (void __user *)arg);
+}
+
+static int f2fs_ioc_remove_encryption_key(struct file *filp, unsigned long arg)
+{
+	if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
+		return -EOPNOTSUPP;
+
+	return fscrypt_ioctl_remove_key(filp, (const void __user *)arg);
+}
+
+static int f2fs_ioc_get_encryption_key_status(struct file *filp,
+					      unsigned long arg)
+{
+	if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
+		return -EOPNOTSUPP;
+
+	return fscrypt_ioctl_get_key_status(filp, (void __user *)arg);
+}
+
 static int f2fs_ioc_gc(struct file *filp, unsigned long arg)
 {
 	struct inode *inode = file_inode(filp);
@@ -3109,6 +3143,14 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		return f2fs_ioc_get_encryption_policy(filp, arg);
 	case F2FS_IOC_GET_ENCRYPTION_PWSALT:
 		return f2fs_ioc_get_encryption_pwsalt(filp, arg);
+	case FS_IOC_GET_ENCRYPTION_POLICY_EX:
+		return f2fs_ioc_get_encryption_policy_ex(filp, arg);
+	case FS_IOC_ADD_ENCRYPTION_KEY:
+		return f2fs_ioc_add_encryption_key(filp, arg);
+	case FS_IOC_REMOVE_ENCRYPTION_KEY:
+		return f2fs_ioc_remove_encryption_key(filp, arg);
+	case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
+		return f2fs_ioc_get_encryption_key_status(filp, arg);
 	case F2FS_IOC_GARBAGE_COLLECT:
 		return f2fs_ioc_gc(filp, arg);
 	case F2FS_IOC_GARBAGE_COLLECT_RANGE:
@@ -3236,6 +3278,10 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	case F2FS_IOC_SET_ENCRYPTION_POLICY:
 	case F2FS_IOC_GET_ENCRYPTION_PWSALT:
 	case F2FS_IOC_GET_ENCRYPTION_POLICY:
+	case FS_IOC_GET_ENCRYPTION_POLICY_EX:
+	case FS_IOC_ADD_ENCRYPTION_KEY:
+	case FS_IOC_REMOVE_ENCRYPTION_KEY:
+	case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
 	case F2FS_IOC_GARBAGE_COLLECT:
 	case F2FS_IOC_GARBAGE_COLLECT_RANGE:
 	case F2FS_IOC_WRITE_CHECKPOINT:
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 6de6cda440315..f5fae8d511a20 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -913,6 +913,8 @@ static int f2fs_drop_inode(struct inode *inode)
 		return 0;
 	}
 	ret = generic_drop_inode(inode);
+	if (!ret)
+		ret = fscrypt_drop_inode(inode);
 	trace_f2fs_drop_inode(inode, ret);
 	return ret;
 }
-- 
2.22.0