@@ -543,7 +543,7 @@ EXPORT_SYMBOL_GPL(fscrypt_fname_siphash);
* Validate dentries in encrypted directories to make sure we aren't potentially
* caching stale dentries after a key has been added.
*/
-static int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags)
+int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags)
{
struct dentry *dir;
int err;
@@ -582,7 +582,4 @@ static int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags)
return valid;
}
-
-const struct dentry_operations fscrypt_d_ops = {
- .d_revalidate = fscrypt_d_revalidate,
-};
+EXPORT_SYMBOL(fscrypt_d_revalidate);
@@ -250,7 +250,6 @@ extern int fscrypt_fname_encrypt(const struct inode *inode,
extern bool fscrypt_fname_encrypted_size(const struct inode *inode,
u32 orig_len, u32 max_len,
u32 *encrypted_len_ret);
-extern const struct dentry_operations fscrypt_d_ops;
/* hkdf.c */
@@ -118,7 +118,6 @@ int __fscrypt_prepare_lookup(struct inode *dir, struct dentry *dentry,
spin_lock(&dentry->d_lock);
dentry->d_flags |= DCACHE_ENCRYPTED_NAME;
spin_unlock(&dentry->d_lock);
- d_set_d_op(dentry, &fscrypt_d_ops);
}
return err;
}
@@ -668,8 +668,44 @@ const struct file_operations ext4_dir_operations = {
};
#ifdef CONFIG_UNICODE
-const struct dentry_operations ext4_dentry_ops = {
+static const struct dentry_operations ext4_ci_dentry_ops = {
.d_hash = utf8_ci_d_hash,
.d_compare = utf8_ci_d_compare,
};
#endif
+
+#ifdef CONFIG_FS_ENCRYPTION
+static const struct dentry_operations ext4_encrypted_dentry_ops = {
+ .d_revalidate = fscrypt_d_revalidate,
+};
+#endif
+
+#if IS_ENABLED(CONFIG_UNICODE) && IS_ENABLED(CONFIG_FS_ENCRYPTION)
+static const struct dentry_operations ext4_encrypted_ci_dentry_ops = {
+ .d_hash = utf8_ci_d_hash,
+ .d_compare = utf8_ci_d_compare,
+ .d_revalidate = fscrypt_d_revalidate,
+};
+#endif
+
+void ext4_set_d_ops(struct inode *dir, struct dentry *dentry)
+{
+#ifdef CONFIG_FS_ENCRYPTION
+ if (dentry->d_flags & DCACHE_ENCRYPTED_NAME) {
+#ifdef CONFIG_UNICODE
+ if (dir->i_sb->s_encoding) {
+ d_set_d_op(dentry, &ext4_encrypted_ci_dentry_ops);
+ return;
+ }
+#endif
+ d_set_d_op(dentry, &ext4_encrypted_dentry_ops);
+ return;
+ }
+#endif
+#ifdef CONFIG_UNICODE
+ if (dir->i_sb->s_encoding) {
+ d_set_d_op(dentry, &ext4_ci_dentry_ops);
+ return;
+ }
+#endif
+}
@@ -2494,6 +2494,7 @@ static inline unsigned char get_dtype(struct super_block *sb, int filetype)
}
extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
void *buf, int buf_size);
+void ext4_set_d_ops(struct inode *dir, struct dentry *dentry);
/* fsync.c */
extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
@@ -1608,6 +1608,7 @@ static struct buffer_head *ext4_lookup_entry(struct inode *dir,
struct buffer_head *bh;
err = ext4_fname_prepare_lookup(dir, dentry, &fname);
+ ext4_set_d_ops(dir, dentry);
if (err == -ENOENT)
return NULL;
if (err)
@@ -4497,11 +4497,6 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
goto failed_mount4;
}
-#ifdef CONFIG_UNICODE
- if (sbi->s_encoding)
- sb->s_d_op = &ext4_dentry_ops;
-#endif
-
sb->s_root = d_make_root(root);
if (!sb->s_root) {
ext4_msg(sb, KERN_ERR, "get root dentry failed");
@@ -1065,8 +1065,44 @@ const struct file_operations f2fs_dir_operations = {
};
#ifdef CONFIG_UNICODE
-const struct dentry_operations f2fs_dentry_ops = {
+static const struct dentry_operations f2fs_ci_dentry_ops = {
.d_hash = utf8_ci_d_hash,
.d_compare = utf8_ci_d_compare,
};
#endif
+
+#ifdef CONFIG_FS_ENCRYPTION
+static const struct dentry_operations f2fs_encrypted_dentry_ops = {
+ .d_revalidate = fscrypt_d_revalidate,
+};
+#endif
+
+#if IS_ENABLED(CONFIG_UNICODE) && IS_ENABLED(CONFIG_FS_ENCRYPTION)
+static const struct dentry_operations f2fs_encrypted_ci_dentry_ops = {
+ .d_hash = utf8_ci_d_hash,
+ .d_compare = utf8_ci_d_compare,
+ .d_revalidate = fscrypt_d_revalidate,
+};
+#endif
+
+void f2fs_set_d_ops(struct inode *dir, struct dentry *dentry)
+{
+#ifdef CONFIG_FS_ENCRYPTION
+ if (dentry->d_flags & DCACHE_ENCRYPTED_NAME) {
+#ifdef CONFIG_UNICODE
+ if (dir->i_sb->s_encoding) {
+ d_set_d_op(dentry, &f2fs_encrypted_ci_dentry_ops);
+ return;
+ }
+#endif
+ d_set_d_op(dentry, &f2fs_encrypted_dentry_ops);
+ return;
+ }
+#endif
+#ifdef CONFIG_UNICODE
+ if (dir->i_sb->s_encoding) {
+ d_set_d_op(dentry, &f2fs_ci_dentry_ops);
+ return;
+ }
+#endif
+}
@@ -3017,6 +3017,7 @@ static inline int f2fs_add_link(struct dentry *dentry, struct inode *inode)
return f2fs_do_add_link(d_inode(dentry->d_parent), &dentry->d_name,
inode, inode->i_ino, inode->i_mode);
}
+void f2fs_set_d_ops(struct inode *dir, struct dentry *dentry);
/*
* super.c
@@ -3481,9 +3482,6 @@ static inline void f2fs_destroy_root_stats(void) { }
#endif
extern const struct file_operations f2fs_dir_operations;
-#ifdef CONFIG_UNICODE
-extern const struct dentry_operations f2fs_dentry_ops;
-#endif
extern const struct file_operations f2fs_file_operations;
extern const struct inode_operations f2fs_file_inode_operations;
extern const struct address_space_operations f2fs_dblock_aops;
@@ -443,6 +443,7 @@ static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
}
err = fscrypt_prepare_lookup(dir, dentry, &fname);
+ f2fs_set_d_ops(dir, dentry);
if (err == -ENOENT)
goto out_splice;
if (err)
@@ -3169,7 +3169,6 @@ static int f2fs_setup_casefold(struct f2fs_sb_info *sbi)
sbi->sb->s_encoding = encoding;
sbi->sb->s_encoding_flags = encoding_flags;
- sbi->sb->s_d_op = &f2fs_dentry_ops;
}
#else
if (f2fs_sb_has_casefold(sbi)) {
@@ -196,6 +196,7 @@ static int dbg_check_name(const struct ubifs_info *c,
return 0;
}
+static void ubifs_set_d_ops(struct inode *dir, struct dentry *dentry);
static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
@@ -209,6 +210,7 @@ static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino);
err = fscrypt_prepare_lookup(dir, dentry, &nm);
+ ubifs_set_d_ops(dir, dentry);
if (err == -ENOENT)
return d_splice_alias(NULL, dentry);
if (err)
@@ -1655,3 +1657,19 @@ const struct file_operations ubifs_dir_operations = {
.compat_ioctl = ubifs_compat_ioctl,
#endif
};
+
+#ifdef CONFIG_FS_ENCRYPTION
+static const struct dentry_operations ubifs_encrypted_dentry_ops = {
+ .d_revalidate = fscrypt_d_revalidate,
+};
+#endif
+
+static void ubifs_set_d_ops(struct inode *dir, struct dentry *dentry)
+{
+#ifdef CONFIG_FS_ENCRYPTION
+ if (dentry->d_flags & DCACHE_ENCRYPTED_NAME) {
+ d_set_d_op(dentry, &ubifs_encrypted_dentry_ops);
+ return;
+ }
+#endif
+}
@@ -134,6 +134,7 @@ static inline struct page *fscrypt_pagecache_page(struct page *bounce_page)
}
extern void fscrypt_free_bounce_page(struct page *bounce_page);
+extern int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags);
/* policy.c */
extern int fscrypt_ioctl_set_policy(struct file *, const void __user *);
@@ -595,8 +596,9 @@ static inline int fscrypt_prepare_rename(struct inode *old_dir,
* filenames are presented in encrypted form. Therefore, we'll try to set up
* the directory's encryption key, but even without it the lookup can continue.
*
- * This also installs a custom ->d_revalidate() method which will invalidate the
- * dentry if it was created without the key and the key is later added.
+ * After calling this function, a filesystem should ensure that it's dentry
+ * operations contain fscrypt_d_revalidate if DCACHE_ENCRYPTED_NAME was set,
+ * so that the dentry can be invalidated if the key is later added.
*
* Return: 0 on success; -ENOENT if key is unavailable but the filename isn't a
* correctly formed encoded ciphertext name, so a negative dentry should be
This shifts the responsibility of setting up dentry operations from fscrypt to the individual filesystems, allowing them to have their own operations while still setting fscrypt's d_revalidate as appropriate. Signed-off-by: Daniel Rosenberg <drosen@google.com> --- Should the d_op setting functions go into fs/libfs.c? fs/crypto/fname.c | 7 ++----- fs/crypto/fscrypt_private.h | 1 - fs/crypto/hooks.c | 1 - fs/ext4/dir.c | 38 ++++++++++++++++++++++++++++++++++++- fs/ext4/ext4.h | 1 + fs/ext4/namei.c | 1 + fs/ext4/super.c | 5 ----- fs/f2fs/dir.c | 38 ++++++++++++++++++++++++++++++++++++- fs/f2fs/f2fs.h | 4 +--- fs/f2fs/namei.c | 1 + fs/f2fs/super.c | 1 - fs/ubifs/dir.c | 18 ++++++++++++++++++ include/linux/fscrypt.h | 6 ++++-- 13 files changed, 102 insertions(+), 20 deletions(-)