linux-ext4 - [PATCH v6 13/16] ext4: wire up new fscrypt ioctls

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Message-Id: <20190520172552.217253-14-ebiggers@kernel.org>
Date:   Mon, 20 May 2019 10:25:49 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     linux-fscrypt@...r.kernel.org
Cc:     Satya Tangirala <satyat@...gle.com>, linux-api@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, keyrings@...r.kernel.org,
        linux-mtd@...ts.infradead.org, linux-crypto@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        Paul Crowley <paulcrowley@...gle.com>
Subject: [PATCH v6 13/16] ext4: wire up new fscrypt ioctls

From: Eric Biggers <ebiggers@...gle.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 ext4_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@...gle.com>
---
 fs/ext4/ioctl.c | 24 ++++++++++++++++++++++++
 fs/ext4/super.c |  3 +++
 2 files changed, 27 insertions(+)

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index e486e49b31ed7..b51b6384045b8 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -1092,6 +1092,26 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 	case EXT4_IOC_GET_ENCRYPTION_POLICY:
 		return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
 
+	case FS_IOC_GET_ENCRYPTION_POLICY_EX:
+		if (!ext4_has_feature_encrypt(sb))
+			return -EOPNOTSUPP;
+		return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg);
+
+	case FS_IOC_ADD_ENCRYPTION_KEY:
+		if (!ext4_has_feature_encrypt(sb))
+			return -EOPNOTSUPP;
+		return fscrypt_ioctl_add_key(filp, (void __user *)arg);
+
+	case FS_IOC_REMOVE_ENCRYPTION_KEY:
+		if (!ext4_has_feature_encrypt(sb))
+			return -EOPNOTSUPP;
+		return fscrypt_ioctl_remove_key(filp, (const void __user *)arg);
+
+	case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
+		if (!ext4_has_feature_encrypt(sb))
+			return -EOPNOTSUPP;
+		return fscrypt_ioctl_get_key_status(filp, (void __user *)arg);
+
 	case EXT4_IOC_FSGETXATTR:
 	{
 		struct fsxattr fa;
@@ -1210,6 +1230,10 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	case EXT4_IOC_SET_ENCRYPTION_POLICY:
 	case EXT4_IOC_GET_ENCRYPTION_PWSALT:
 	case EXT4_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 EXT4_IOC_SHUTDOWN:
 	case FS_IOC_GETFSMAP:
 		break;
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 4079605d437ae..757819139b8f7 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1107,6 +1107,9 @@ static int ext4_drop_inode(struct inode *inode)
 {
 	int drop = generic_drop_inode(inode);
 
+	if (!drop)
+		drop = fscrypt_drop_inode(inode);
+
 	trace_ext4_drop_inode(inode, drop);
 	return drop;
 }
-- 
2.21.0.1020.gf2820cf01a-goog