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Subject[RFC PATCH 05/19] btrfs: add key list
Date
Signed-off-by: Mark Harmstone <mark@harmstone.com>
---
fs/btrfs/ctree.h | 5 +++++
fs/btrfs/disk-io.c | 18 ++++++++++++++++++
fs/btrfs/encryption.h | 13 +++++++++++++
3 files changed, 36 insertions(+)

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 723e9b38e0aa..3f3356a2d145 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1116,6 +1116,9 @@ struct btrfs_fs_info {
u32 sectorsize;
u32 stripesize;

+ struct list_head key_list;
+ struct rw_semaphore key_sem;
+
#ifdef CONFIG_BTRFS_FS_REF_VERIFY
spinlock_t ref_verify_lock;
struct rb_root block_tree;
@@ -2413,6 +2416,8 @@ BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
other_encoding, 16);

+#define BTRFS_ENCRYPTION_KEY_ID_LENGTH 64
+
/*
* this returns the number of bytes used by the item on disk, minus the
* size of any extent headers. If a file is compressed on disk, this is
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index a533c00855be..a1964b768750 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -18,6 +18,7 @@
#include <linux/error-injection.h>
#include <linux/crc32c.h>
#include <asm/unaligned.h>
+#include <crypto/rng.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
@@ -38,6 +39,7 @@
#include "compression.h"
#include "tree-checker.h"
#include "ref-verify.h"
+#include "encryption.h"

#ifdef CONFIG_X86
#include <asm/cpufeature.h>
@@ -2751,6 +2753,9 @@ int open_ctree(struct super_block *sb,

INIT_LIST_HEAD(&fs_info->pinned_chunks);

+ INIT_LIST_HEAD(&fs_info->key_list);
+ init_rwsem(&fs_info->key_sem);
+
/* Usable values until the real ones are cached from the superblock */
fs_info->nodesize = 4096;
fs_info->sectorsize = 4096;
@@ -4013,6 +4018,19 @@ void close_ctree(struct btrfs_fs_info *fs_info)
list_del_init(&em->list);
free_extent_map(em);
}
+
+ while (!list_empty(&fs_info->key_list)) {
+ struct btrfs_enc_key *key;
+
+ key = list_first_entry(&fs_info->key_list,
+ struct btrfs_enc_key, key_list);
+
+ if (key->loaded)
+ crypto_free_skcipher(key->skcipher);
+
+ list_del_init(&key->key_list);
+ kfree(key);
+ }
}

int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
diff --git a/fs/btrfs/encryption.h b/fs/btrfs/encryption.h
index b9a37e76e4a6..77914d7797c6 100644
--- a/fs/btrfs/encryption.h
+++ b/fs/btrfs/encryption.h
@@ -6,6 +6,8 @@
#ifndef BTRFS_ENCRYPTION_H
#define BTRFS_ENCRYPTION_H

+#include <crypto/skcipher.h>
+
enum btrfs_encryption_type {
BTRFS_ENCRYPTION_NONE = 0,
BTRFS_ENCRYPTION_AES256CTR = 1,
@@ -17,4 +19,15 @@ struct btrfs_encryption_header {
u8 iv[BTRFS_ENCRYPTION_BLOCK_LENGTH];
};

+struct btrfs_enc_key {
+ struct list_head key_list;
+ u8 key_id[BTRFS_ENCRYPTION_KEY_ID_LENGTH];
+ u64 key_number;
+ bool loaded;
+ bool added;
+ bool used;
+ struct crypto_skcipher *skcipher;
+ struct mutex lock;
+};
+
#endif
--
2.19.2
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