[PATCH v3 09/22] btrfs: store directory encryption state

Sweet Tea Dorminy
2022-10-20T16:59:55Z

From: Omar Sandoval <osandov@osandov.com>

For directories with encrypted files/filenames, we need to store a flag
indicating this fact. There's no room in other fields, so we'll need to
borrow a bit from dir_type. Since it's now a combination of type and
flags, we rename it to dir_flags to reflect its new usage.

The new flag, FT_ENCRYPTED, indicates a directory containing encrypted
data, which is orthogonal to file type; therefore, add the new
flag, and make conversion from directory type to file type strip the
flag.

Signed-off-by: Omar Sandoval <osandov@osandov.com>
Signed-off-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me>
---
fs/btrfs/ctree.h | 15 +++++++++++++--
fs/btrfs/delayed-inode.c | 6 +++---
fs/btrfs/delayed-inode.h | 2 +-
fs/btrfs/dir-item.c | 7 +++++--
fs/btrfs/inode.c | 13 +++++++------
fs/btrfs/print-tree.c | 4 ++--
fs/btrfs/send.c | 2 +-
fs/btrfs/tree-checker.c | 2 +-
fs/btrfs/tree-log.c | 20 ++++++++++----------
include/uapi/linux/btrfs_tree.h | 7 +++++++
10 files changed, 50 insertions(+), 28 deletions(-)

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 9d1186a16912..38aef923c33b 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1935,10 +1935,10 @@ BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);

/* struct btrfs_dir_item */
BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
-BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
+BTRFS_SETGET_FUNCS(dir_flags, struct btrfs_dir_item, type, 8);
BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
-BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
+BTRFS_SETGET_STACK_FUNCS(stack_dir_flags, struct btrfs_dir_item, type, 8);
BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
data_len, 16);
BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
@@ -1946,6 +1946,17 @@ BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
transid, 64);

+static inline u8 btrfs_dir_ftype(const struct extent_buffer *eb,
+ const struct btrfs_dir_item *item)
+{
+ return btrfs_dir_flags_to_ftype(btrfs_dir_flags(eb, item));
+}
+
+static inline u8 btrfs_stack_dir_ftype(const struct btrfs_dir_item *item)
+{
+ return btrfs_dir_flags_to_ftype(btrfs_stack_dir_flags(item));
+}
+
static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
const struct btrfs_dir_item *item,
struct btrfs_disk_key *key)
diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c
index a411f04a7b97..3a492c8aa1ee 100644
--- a/fs/btrfs/delayed-inode.c
+++ b/fs/btrfs/delayed-inode.c
@@ -1413,7 +1413,7 @@ void btrfs_balance_delayed_items(struct btrfs_fs_info *fs_info)
int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
const char *name, int name_len,
struct btrfs_inode *dir,
- struct btrfs_disk_key *disk_key, u8 type,
+ struct btrfs_disk_key *disk_key, u8 flags,
u64 index)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
@@ -1444,7 +1444,7 @@ int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
btrfs_set_stack_dir_transid(dir_item, trans->transid);
btrfs_set_stack_dir_data_len(dir_item, 0);
btrfs_set_stack_dir_name_len(dir_item, name_len);
- btrfs_set_stack_dir_type(dir_item, type);
+ btrfs_set_stack_dir_flags(dir_item, flags);
memcpy((char *)(dir_item + 1), name, name_len);

data_len = delayed_item->data_len + sizeof(struct btrfs_item);
@@ -1754,7 +1754,7 @@ int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
name = (char *)(di + 1);
name_len = btrfs_stack_dir_name_len(di);

- d_type = fs_ftype_to_dtype(di->type);
+ d_type = fs_ftype_to_dtype(btrfs_dir_flags_to_ftype(di->type));
btrfs_disk_key_to_cpu(&location, &di->location);

over = !dir_emit(ctx, name, name_len,
diff --git a/fs/btrfs/delayed-inode.h b/fs/btrfs/delayed-inode.h
index 0163ca637a96..4f21daa3dbc7 100644
--- a/fs/btrfs/delayed-inode.h
+++ b/fs/btrfs/delayed-inode.h
@@ -113,7 +113,7 @@ static inline void btrfs_init_delayed_root(
int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
const char *name, int name_len,
struct btrfs_inode *dir,
- struct btrfs_disk_key *disk_key, u8 type,
+ struct btrfs_disk_key *disk_key, u8 flags,
u64 index);

int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans,
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index fdab48c1abb8..f6987823903b 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -81,7 +81,7 @@ int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
leaf = path->nodes[0];
btrfs_cpu_key_to_disk(&disk_key, &location);
btrfs_set_dir_item_key(leaf, dir_item, &disk_key);
- btrfs_set_dir_type(leaf, dir_item, BTRFS_FT_XATTR);
+ btrfs_set_dir_flags(leaf, dir_item, BTRFS_FT_XATTR);
btrfs_set_dir_name_len(leaf, dir_item, name_len);
btrfs_set_dir_transid(leaf, dir_item, trans->transid);
btrfs_set_dir_data_len(leaf, dir_item, data_len);
@@ -138,9 +138,12 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
goto out_free;
}

+ if (IS_ENCRYPTED(&dir->vfs_inode))
+ type |= BTRFS_FT_ENCRYPTED;
+
leaf = path->nodes[0];
btrfs_set_dir_item_key(leaf, dir_item, &disk_key);
- btrfs_set_dir_type(leaf, dir_item, type);
+ btrfs_set_dir_flags(leaf, dir_item, type);
btrfs_set_dir_data_len(leaf, dir_item, 0);
btrfs_set_dir_name_len(leaf, dir_item, name->len);
btrfs_set_dir_transid(leaf, dir_item, trans->transid);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index b36e1bfdadd5..b2728e95a7b9 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5594,7 +5594,7 @@ static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
location->objectid, location->type, location->offset);
}
if (!ret)
- *type = btrfs_dir_type(path->nodes[0], di);
+ *type = btrfs_dir_ftype(path->nodes[0], di);
out:
fscrypt_free_filename(&fname);
btrfs_free_path(path);
@@ -6044,6 +6044,7 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx)
btrfs_for_each_slot(root, &key, &found_key, path, ret) {
struct dir_entry *entry;
struct extent_buffer *leaf = path->nodes[0];
+ u8 ftype;

if (found_key.objectid != key.objectid)
break;
@@ -6067,13 +6068,13 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx)
goto again;
}

+ ftype = btrfs_dir_flags_to_ftype(btrfs_dir_flags(leaf, di));
entry = addr;
- put_unaligned(name_len, &entry->name_len);
name_ptr = (char *)(entry + 1);
- read_extent_buffer(leaf, name_ptr, (unsigned long)(di + 1),
- name_len);
- put_unaligned(fs_ftype_to_dtype(btrfs_dir_type(leaf, di)),
- &entry->type);
+ read_extent_buffer(leaf, name_ptr,
+ (unsigned long)(di + 1), name_len);
+ put_unaligned(name_len, &entry->name_len);
+ put_unaligned(fs_ftype_to_dtype(ftype), &entry->type);
btrfs_dir_item_key_to_cpu(leaf, di, &location);
put_unaligned(location.objectid, &entry->ino);
put_unaligned(found_key.offset, &entry->offset);
diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
index dd8777872143..6d9d99bf3536 100644
--- a/fs/btrfs/print-tree.c
+++ b/fs/btrfs/print-tree.c
@@ -240,9 +240,9 @@ void btrfs_print_leaf(struct extent_buffer *l)
case BTRFS_DIR_ITEM_KEY:
di = btrfs_item_ptr(l, i, struct btrfs_dir_item);
btrfs_dir_item_key_to_cpu(l, di, &found_key);
- pr_info("\t\tdir oid %llu type %u\n",
+ pr_info("\t\tdir oid %llu flags %u\n",
found_key.objectid,
- btrfs_dir_type(l, di));
+ btrfs_dir_flags(l, di));
break;
case BTRFS_ROOT_ITEM_KEY:
ri = btrfs_item_ptr(l, i, struct btrfs_root_item);
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index dcca2f733af1..526b323955fb 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -1093,7 +1093,7 @@ static int iterate_dir_item(struct btrfs_root *root, struct btrfs_path *path,
data_len = btrfs_dir_data_len(eb, di);
btrfs_dir_item_key_to_cpu(eb, di, &di_key);

- if (btrfs_dir_type(eb, di) == BTRFS_FT_XATTR) {
+ if (btrfs_dir_ftype(eb, di) == BTRFS_FT_XATTR) {
if (name_len > XATTR_NAME_MAX) {
ret = -ENAMETOOLONG;
goto out;
diff --git a/fs/btrfs/tree-checker.c b/fs/btrfs/tree-checker.c
index 43f905ab0a18..77c53a7491cf 100644
--- a/fs/btrfs/tree-checker.c
+++ b/fs/btrfs/tree-checker.c
@@ -528,7 +528,7 @@ static int check_dir_item(struct extent_buffer *leaf,
}

/* dir type check */
- dir_type = btrfs_dir_type(leaf, di);
+ dir_type = btrfs_dir_ftype(leaf, di);
if (unlikely(dir_type >= BTRFS_FT_MAX)) {
dir_item_err(leaf, slot,
"invalid dir item type, have %u expect [0, %u)",
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 078869dbb68f..7db1fa23e001 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -1798,7 +1798,7 @@ static int delete_conflicting_dir_entry(struct btrfs_trans_handle *trans,
struct btrfs_path *path,
struct btrfs_dir_item *dst_di,
const struct btrfs_key *log_key,
- u8 log_type,
+ u8 log_flags,
bool exists)
{
struct btrfs_key found_key;
@@ -1808,7 +1808,7 @@ static int delete_conflicting_dir_entry(struct btrfs_trans_handle *trans,
if (found_key.objectid == log_key->objectid &&
found_key.type == log_key->type &&
found_key.offset == log_key->offset &&
- btrfs_dir_type(path->nodes[0], dst_di) == log_type)
+ btrfs_dir_flags(path->nodes[0], dst_di) == log_flags)
return 1;

/*
@@ -1852,7 +1852,7 @@ static noinline int replay_one_name(struct btrfs_trans_handle *trans,
struct btrfs_key log_key;
struct btrfs_key search_key;
struct inode *dir;
- u8 log_type;
+ u8 log_flags;
bool exists;
int ret;
bool update_size = true;
@@ -1866,7 +1866,7 @@ static noinline int replay_one_name(struct btrfs_trans_handle *trans,
if (ret)
goto out;

- log_type = btrfs_dir_type(eb, di);
+ log_flags = btrfs_dir_flags(eb, di);
btrfs_dir_item_key_to_cpu(eb, di, &log_key);
ret = btrfs_lookup_inode(trans, root, path, &log_key, 0);
btrfs_release_path(path);
@@ -1882,8 +1882,8 @@ static noinline int replay_one_name(struct btrfs_trans_handle *trans,
goto out;
} else if (dir_dst_di) {
ret = delete_conflicting_dir_entry(trans, BTRFS_I(dir), path,
- dir_dst_di, &log_key, log_type,
- exists);
+ dir_dst_di, &log_key,
+ log_flags, exists);
if (ret < 0)
goto out;
dir_dst_matches = (ret == 1);
@@ -1900,7 +1900,7 @@ static noinline int replay_one_name(struct btrfs_trans_handle *trans,
} else if (index_dst_di) {
ret = delete_conflicting_dir_entry(trans, BTRFS_I(dir), path,
index_dst_di, &log_key,
- log_type, exists);
+ log_flags, exists);
if (ret < 0)
goto out;
index_dst_matches = (ret == 1);
@@ -2009,7 +2009,7 @@ static noinline int replay_one_dir_item(struct btrfs_trans_handle *trans,
* to ever delete the parent directory has it would result in stale
* dentries that can never be deleted.
*/
- if (ret == 1 && btrfs_dir_type(eb, di) != BTRFS_FT_DIR) {
+ if (ret == 1 && btrfs_dir_ftype(eb, di) != BTRFS_FT_DIR) {
struct btrfs_path *fixup_path;
struct btrfs_key di_key;

@@ -5400,7 +5400,7 @@ static int log_new_dir_dentries(struct btrfs_trans_handle *trans,
}

di = btrfs_item_ptr(leaf, i, struct btrfs_dir_item);
- type = btrfs_dir_type(leaf, di);
+ type = btrfs_dir_ftype(leaf, di);
if (btrfs_dir_transid(leaf, di) < trans->transid)
continue;
btrfs_dir_item_key_to_cpu(leaf, di, &di_key);
@@ -6240,7 +6240,7 @@ static int log_new_delayed_dentries(struct btrfs_trans_handle *trans,
continue;
}

- if (btrfs_stack_dir_type(dir_item) == BTRFS_FT_DIR)
+ if (btrfs_stack_dir_ftype(dir_item) == BTRFS_FT_DIR)
log_mode = LOG_INODE_ALL;

ctx->log_new_dentries = false;
diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h
index f6eb8a0aee6e..10c3c41329bc 100644
--- a/include/uapi/linux/btrfs_tree.h
+++ b/include/uapi/linux/btrfs_tree.h
@@ -375,6 +375,13 @@ enum btrfs_csum_type {
#define BTRFS_FT_SYMLINK 7
#define BTRFS_FT_XATTR 8
#define BTRFS_FT_MAX 9
+/* Directory contains encrypted data */
+#define BTRFS_FT_ENCRYPTED 0x80
+
+static inline __u8 btrfs_dir_flags_to_ftype(__u8 flags)
+{
+ return flags & ~BTRFS_FT_ENCRYPTED;
+}

/*
* Inode flags
--
2.35.1