[PATCH 15/18] f2fs crypto: add filename encryption for roll-forward recovery

Jaegeuk Kim
2015-05-09T04:23:11Z

This patch adds a bit flag to indicate whether or not i_name in the inode
is encrypted.

If this name is encrypted, we can't do recover_dentry during roll-forward.
So, f2fs_sync_file() needs to do checkpoint, if this will be needed in future.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
fs/f2fs/dir.c | 8 +++++++-
fs/f2fs/f2fs.h | 5 ++++-
fs/f2fs/file.c | 4 +++-
fs/f2fs/namei.c | 20 +++++++++++++++-----
fs/f2fs/recovery.c | 13 ++++++++++++-
5 files changed, 41 insertions(+), 9 deletions(-)

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 5e10d9d..12f6869 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -314,10 +314,14 @@ static void init_dent_inode(const struct qstr *name, struct page *ipage)
set_page_dirty(ipage);
}

-int update_dent_inode(struct inode *inode, const struct qstr *name)
+int update_dent_inode(struct inode *inode, struct inode *to,
+ const struct qstr *name)
{
struct page *page;

+ if (file_enc_name(to))
+ return 0;
+
page = get_node_page(F2FS_I_SB(inode), inode->i_ino);
if (IS_ERR(page))
return PTR_ERR(page);
@@ -597,6 +601,8 @@ add_dentry:
err = PTR_ERR(page);
goto fail;
}
+ if (f2fs_encrypted_inode(dir))
+ file_set_enc_name(inode);
}

make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 6898331..fda040b 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -378,6 +378,7 @@ struct f2fs_map_blocks {
#define FADVISE_COLD_BIT 0x01
#define FADVISE_LOST_PINO_BIT 0x02
#define FADVISE_ENCRYPT_BIT 0x04
+#define FADVISE_ENC_NAME_BIT 0x08

#define file_is_cold(inode) is_file(inode, FADVISE_COLD_BIT)
#define file_wrong_pino(inode) is_file(inode, FADVISE_LOST_PINO_BIT)
@@ -388,6 +389,8 @@ struct f2fs_map_blocks {
#define file_is_encrypt(inode) is_file(inode, FADVISE_ENCRYPT_BIT)
#define file_set_encrypt(inode) set_file(inode, FADVISE_ENCRYPT_BIT)
#define file_clear_encrypt(inode) clear_file(inode, FADVISE_ENCRYPT_BIT)
+#define file_enc_name(inode) is_file(inode, FADVISE_ENC_NAME_BIT)
+#define file_set_enc_name(inode) set_file(inode, FADVISE_ENC_NAME_BIT)

/* Encryption algorithms */
#define F2FS_ENCRYPTION_MODE_INVALID 0
@@ -1602,7 +1605,7 @@ struct f2fs_dir_entry *f2fs_parent_dir(struct inode *, struct page **);
ino_t f2fs_inode_by_name(struct inode *, struct qstr *);
void f2fs_set_link(struct inode *, struct f2fs_dir_entry *,
struct page *, struct inode *);
-int update_dent_inode(struct inode *, const struct qstr *);
+int update_dent_inode(struct inode *, struct inode *, const struct qstr *);
void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *,
const struct qstr *, f2fs_hash_t , unsigned int);
int __f2fs_add_link(struct inode *, const struct qstr *, struct inode *, nid_t,
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index d7daff8..14eb4f7 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -106,7 +106,7 @@ static int get_parent_ino(struct inode *inode, nid_t *pino)
if (!dentry)
return 0;

- if (update_dent_inode(inode, &dentry->d_name)) {
+ if (update_dent_inode(inode, inode, &dentry->d_name)) {
dput(dentry);
return 0;
}
@@ -123,6 +123,8 @@ static inline bool need_do_checkpoint(struct inode *inode)

if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)
need_cp = true;
+ else if (file_enc_name(inode) && need_dentry_mark(sbi, inode->i_ino))
+ need_cp = true;
else if (file_wrong_pino(inode))
need_cp = true;
else if (!space_for_roll_forward(sbi))
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index bc8992e..c857f82 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -517,7 +517,8 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
if (err)
goto put_out_dir;

- if (update_dent_inode(old_inode, &new_dentry->d_name)) {
+ if (update_dent_inode(old_inode, new_inode,
+ &new_dentry->d_name)) {
release_orphan_inode(sbi);
goto put_out_dir;
}
@@ -557,6 +558,8 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,

down_write(&F2FS_I(old_inode)->i_sem);
file_lost_pino(old_inode);
+ if (new_inode && file_enc_name(new_inode))
+ file_set_enc_name(old_inode);
up_write(&F2FS_I(old_inode)->i_sem);

old_inode->i_ctime = CURRENT_TIME;
@@ -659,13 +662,17 @@ static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,

f2fs_lock_op(sbi);

- err = update_dent_inode(old_inode, &new_dentry->d_name);
+ err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
if (err)
goto out_unlock;
+ if (file_enc_name(new_inode))
+ file_set_enc_name(old_inode);

- err = update_dent_inode(new_inode, &old_dentry->d_name);
+ err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
if (err)
goto out_undo;
+ if (file_enc_name(old_inode))
+ file_set_enc_name(new_inode);

/* update ".." directory entry info of old dentry */
if (old_dir_entry)
@@ -723,8 +730,11 @@ static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
f2fs_sync_fs(sbi->sb, 1);
return 0;
out_undo:
- /* Still we may fail to recover name info of f2fs_inode here */
- update_dent_inode(old_inode, &old_dentry->d_name);
+ /*
+ * Still we may fail to recover name info of f2fs_inode here
+ * Drop it, once its name is set as encrypted
+ */
+ update_dent_inode(old_inode, old_inode, &old_dentry->d_name);
out_unlock:
f2fs_unlock_op(sbi);
out_new_dir:
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index f77a1be..9de2587 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -83,6 +83,11 @@ static int recover_dentry(struct inode *inode, struct page *ipage)
goto out;
}

+ if (file_enc_name(inode)) {
+ iput(dir);
+ return 0;
+ }
+
name.len = le32_to_cpu(raw_inode->i_namelen);
name.name = raw_inode->i_name;

@@ -143,6 +148,7 @@ out:
static void recover_inode(struct inode *inode, struct page *page)
{
struct f2fs_inode *raw = F2FS_INODE(page);
+ char *name;

inode->i_mode = le16_to_cpu(raw->i_mode);
i_size_write(inode, le64_to_cpu(raw->i_size));
@@ -153,8 +159,13 @@ static void recover_inode(struct inode *inode, struct page *page)
inode->i_ctime.tv_nsec = le32_to_cpu(raw->i_ctime_nsec);
inode->i_mtime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);

+ if (file_enc_name(inode))
+ name = "<encrypted>";
+ else
+ name = F2FS_INODE(page)->i_name;
+
f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s",
- ino_of_node(page), F2FS_INODE(page)->i_name);
+ ino_of_node(page), name);
}

static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head)
--
2.1.1