diff mbox series

[v3,04/16] fscrypt: add a super_block pointer to fscrypt_info

Message ID ddb81611235ad18653630dc30d661d1ff66c496c.1691505882.git.sweettea-kernel@dorminy.me (mailing list archive)
State New, archived
Headers show
Series fscrypt: add extent encryption | expand

Commit Message

Sweet Tea Dorminy Aug. 8, 2023, 5:08 p.m. UTC 
When fscrypt_infos are attached to extents instead of inodes, we can't
go through the inode to get at the filesystems's superblock. Therefore,
add a dedicated superblock pointer to fscrypt_info to keep track of it.

Signed-off-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me>
---
 fs/crypto/fscrypt_private.h |  3 +++
 fs/crypto/inline_crypt.c    |  4 ++--
 fs/crypto/keysetup.c        | 10 +++++-----
 fs/crypto/keysetup_v1.c     |  6 +++---
 4 files changed, 13 insertions(+), 10 deletions(-)
diff mbox series

Patch

diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h
index 8a1fd1d33cfc..8a6e359f96cf 100644
--- a/fs/crypto/fscrypt_private.h
+++ b/fs/crypto/fscrypt_private.h
@@ -241,6 +241,9 @@  struct fscrypt_info {
 	/* Back-pointer to the inode */
 	struct inode *ci_inode;
 
+	/* The superblock of the filesystem to which this info pertains */
+	struct super_block *ci_sb;
+
 	/*
 	 * The master key with which this inode was unlocked (decrypted).  This
 	 * will be NULL if the master key was found in a process-subscribed
diff --git a/fs/crypto/inline_crypt.c b/fs/crypto/inline_crypt.c
index 2d08abbf5892..260152d5e673 100644
--- a/fs/crypto/inline_crypt.c
+++ b/fs/crypto/inline_crypt.c
@@ -41,7 +41,7 @@  static struct block_device **fscrypt_get_devices(struct super_block *sb,
 
 static unsigned int fscrypt_get_dun_bytes(const struct fscrypt_info *ci)
 {
-	struct super_block *sb = ci->ci_inode->i_sb;
+	struct super_block *sb = ci->ci_sb;
 	unsigned int flags = fscrypt_policy_flags(&ci->ci_policy);
 	int ino_bits = 64, lblk_bits = 64;
 
@@ -155,7 +155,7 @@  int fscrypt_prepare_inline_crypt_key(struct fscrypt_prepared_key *prep_key,
 				     const struct fscrypt_info *ci)
 {
 	const struct inode *inode = ci->ci_inode;
-	struct super_block *sb = inode->i_sb;
+	struct super_block *sb = ci->ci_sb;
 	enum blk_crypto_mode_num crypto_mode = ci->ci_mode->blk_crypto_mode;
 	struct blk_crypto_key *blk_key;
 	struct block_device **devs;
diff --git a/fs/crypto/keysetup.c b/fs/crypto/keysetup.c
index c3d3da5da449..c5f68cf65a6f 100644
--- a/fs/crypto/keysetup.c
+++ b/fs/crypto/keysetup.c
@@ -250,8 +250,7 @@  static int setup_new_mode_prepared_key(struct fscrypt_master_key *mk,
 				       struct fscrypt_prepared_key *prep_key,
 				       const struct fscrypt_info *ci)
 {
-	const struct inode *inode = ci->ci_inode;
-	const struct super_block *sb = inode->i_sb;
+	const struct super_block *sb = ci->ci_sb;
 	unsigned int policy_flags = fscrypt_policy_flags(&ci->ci_policy);
 	struct fscrypt_mode *mode = ci->ci_mode;
 	const u8 mode_num = mode - fscrypt_modes;
@@ -525,7 +524,7 @@  static bool fscrypt_valid_master_key_size(const struct fscrypt_master_key *mk,
 static int find_and_lock_master_key(const struct fscrypt_info *ci,
 				    struct fscrypt_master_key **mk_ret)
 {
-	struct super_block *sb = ci->ci_inode->i_sb;
+	struct super_block *sb = ci->ci_sb;
 	struct fscrypt_key_specifier mk_spec;
 	struct fscrypt_master_key *mk;
 	int err;
@@ -599,7 +598,7 @@  static void put_crypt_info(struct fscrypt_info *ci)
 		if (type == FSCRYPT_KEY_DIRECT_V1)
 			fscrypt_put_direct_key(ci->ci_enc_key);
 		if (type == FSCRYPT_KEY_PER_INFO) {
-			fscrypt_destroy_prepared_key(ci->ci_inode->i_sb,
+			fscrypt_destroy_prepared_key(ci->ci_sb,
 						     ci->ci_enc_key);
 			kfree_sensitive(ci->ci_enc_key);
 		}
@@ -616,7 +615,7 @@  static void put_crypt_info(struct fscrypt_info *ci)
 		spin_lock(&mk->mk_decrypted_inodes_lock);
 		list_del(&ci->ci_master_key_link);
 		spin_unlock(&mk->mk_decrypted_inodes_lock);
-		fscrypt_put_master_key_activeref(ci->ci_inode->i_sb, mk);
+		fscrypt_put_master_key_activeref(ci->ci_sb, mk);
 	}
 	memzero_explicit(ci, sizeof(*ci));
 	kmem_cache_free(fscrypt_info_cachep, ci);
@@ -642,6 +641,7 @@  fscrypt_setup_encryption_info(struct inode *inode,
 		return -ENOMEM;
 
 	crypt_info->ci_inode = inode;
+	crypt_info->ci_sb = inode->i_sb;
 	crypt_info->ci_policy = *policy;
 	memcpy(crypt_info->ci_nonce, nonce, FSCRYPT_FILE_NONCE_SIZE);
 
diff --git a/fs/crypto/keysetup_v1.c b/fs/crypto/keysetup_v1.c
index 1e785cedead0..41d317f08aeb 100644
--- a/fs/crypto/keysetup_v1.c
+++ b/fs/crypto/keysetup_v1.c
@@ -235,7 +235,7 @@  fscrypt_get_direct_key(const struct fscrypt_info *ci, const u8 *raw_key)
 	dk = kzalloc(sizeof(*dk), GFP_KERNEL);
 	if (!dk)
 		return ERR_PTR(-ENOMEM);
-	dk->dk_sb = ci->ci_inode->i_sb;
+	dk->dk_sb = ci->ci_sb;
 	refcount_set(&dk->dk_refcount, 1);
 	dk->dk_mode = ci->ci_mode;
 	dk->dk_key.type = FSCRYPT_KEY_DIRECT_V1;
@@ -309,8 +309,8 @@  int fscrypt_setup_v1_file_key_via_subscribed_keyrings(struct fscrypt_info *ci)
 	key = find_and_lock_process_key(FSCRYPT_KEY_DESC_PREFIX,
 					ci->ci_policy.v1.master_key_descriptor,
 					ci->ci_mode->keysize, &payload);
-	if (key == ERR_PTR(-ENOKEY) && ci->ci_inode->i_sb->s_cop->key_prefix) {
-		key = find_and_lock_process_key(ci->ci_inode->i_sb->s_cop->key_prefix,
+	if (key == ERR_PTR(-ENOKEY) && ci->ci_sb->s_cop->key_prefix) {
+		key = find_and_lock_process_key(ci->ci_sb->s_cop->key_prefix,
 						ci->ci_policy.v1.master_key_descriptor,
 						ci->ci_mode->keysize, &payload);
 	}