[RFC PATCH v4 0/3] f2fs: introduce F2FS_FEATURE_LOST_FOUND feature

[RFC PATCH v4 0/3] f2fs: introduce F2FS_FEATURE_LOST_FOUND feature

[Sheng Yong]

v4->v3:
  * split f2fs patch into 2: one for LOST_FOUND feature, another for
    test_dummy_encryption
  * do not set enc_name if dir is not encrypted
  * do not allow mounting with test_dummy_encryption if encrypt feature
    is not set
v3->v2:
  * fix test_dummy_encryption
v2->v1:
  * introduce new mount option test_dummy_encryption
  * add sysfs entry for LOST_FOUND feature
---8<---

This patchset introduces LOST_FOUND feature in f2fs. If the feature is
enabled, f2fs should avoid to encrypt root directory.

A new mount option "test_dummy_encryption" is introduced, this is used by
xfstests.

Thanks,
Sheng

Sheng Yong (3):
  f2fs: introduce F2FS_FEATURE_LOST_FOUND feature
  f2fs: introduce a new mount option test_dummy_encryption
  ext4: do not allow mount with test_dummy_encryption if encrypt not set

 fs/ext4/super.c |  5 +++--
 fs/f2fs/dir.c   |  4 +++-
 fs/f2fs/f2fs.h  | 13 +++++++++++++
 fs/f2fs/namei.c |  9 ++++++---
 fs/f2fs/super.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 fs/f2fs/sysfs.c |  7 +++++++
 6 files changed, 75 insertions(+), 6 deletions(-)

-- 
2.14.1


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[RFC PATCH v4 1/3] f2fs: introduce F2FS_FEATURE_LOST_FOUND feature

[Sheng Yong]

This patch introduces a new feature, F2FS_FEATURE_LOST_FOUND, which
is set by mkfs. mkfs creates a directory named lost+found, which saves
unreachable files. If fsck finds a file which has no parent, or its
parent is removed by fsck, the file will be placed under lost+found
directory by fsck.

lost+found directory could not be encrypted. As a result, the root
directory cannot be encrypted too. So if LOST_FOUND feature is enabled,
let's avoid to encrypt root directory.

Signed-off-by: Sheng Yong <shengyong1@huawei.com>
---
 fs/f2fs/f2fs.h  |  2 ++
 fs/f2fs/super.c | 12 ++++++++++++
 fs/f2fs/sysfs.c |  7 +++++++
 3 files changed, 21 insertions(+)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index f6dc70666ebb..31f39ab7fce4 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -125,6 +125,7 @@ struct f2fs_mount_info {
 #define F2FS_FEATURE_FLEXIBLE_INLINE_XATTR	0x0040
 #define F2FS_FEATURE_QUOTA_INO		0x0080
 #define F2FS_FEATURE_INODE_CRTIME	0x0100
+#define F2FS_FEATURE_LOST_FOUND		0x0200
 
 #define F2FS_HAS_FEATURE(sb, mask)					\
 	((F2FS_SB(sb)->raw_super->feature & cpu_to_le32(mask)) != 0)
@@ -3211,6 +3212,7 @@ F2FS_FEATURE_FUNCS(inode_chksum, INODE_CHKSUM);
 F2FS_FEATURE_FUNCS(flexible_inline_xattr, FLEXIBLE_INLINE_XATTR);
 F2FS_FEATURE_FUNCS(quota_ino, QUOTA_INO);
 F2FS_FEATURE_FUNCS(inode_crtime, INODE_CRTIME);
+F2FS_FEATURE_FUNCS(lost_found, LOST_FOUND);
 
 #ifdef CONFIG_BLK_DEV_ZONED
 static inline int get_blkz_type(struct f2fs_sb_info *sbi,
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 30b93ad44b9d..b9a6b97c3bd3 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1865,6 +1865,18 @@ static int f2fs_get_context(struct inode *inode, void *ctx, size_t len)
 static int f2fs_set_context(struct inode *inode, const void *ctx, size_t len,
 							void *fs_data)
 {
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+
+	/*
+	 * Encrypting the root directory is not allowed because fsck
+	 * expects lost+found directory to exist and remain unencrypted
+	 * if LOST_FOUND feature is enabled.
+	 *
+	 */
+	if (f2fs_sb_has_lost_found(sbi->sb) &&
+			inode->i_ino == F2FS_ROOT_INO(sbi))
+		return -EPERM;
+
 	return f2fs_setxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION,
 				F2FS_XATTR_NAME_ENCRYPTION_CONTEXT,
 				ctx, len, fs_data, XATTR_CREATE);
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 23a2d8d66c43..53c6785c1916 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -116,6 +116,9 @@ static ssize_t features_show(struct f2fs_attr *a,
 	if (f2fs_sb_has_inode_crtime(sb))
 		len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
 				len ? ", " : "", "inode_crtime");
+	if (f2fs_sb_has_lost_found(sb))
+		len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
+				len ? ", " : "", "lost_found");
 	len += snprintf(buf + len, PAGE_SIZE - len, "\n");
 	return len;
 }
@@ -292,6 +295,7 @@ enum feat_id {
 	FEAT_FLEXIBLE_INLINE_XATTR,
 	FEAT_QUOTA_INO,
 	FEAT_INODE_CRTIME,
+	FEAT_LOST_FOUND,
 };
 
 static ssize_t f2fs_feature_show(struct f2fs_attr *a,
@@ -307,6 +311,7 @@ static ssize_t f2fs_feature_show(struct f2fs_attr *a,
 	case FEAT_FLEXIBLE_INLINE_XATTR:
 	case FEAT_QUOTA_INO:
 	case FEAT_INODE_CRTIME:
+	case FEAT_LOST_FOUND:
 		return snprintf(buf, PAGE_SIZE, "supported\n");
 	}
 	return 0;
@@ -386,6 +391,7 @@ F2FS_FEATURE_RO_ATTR(inode_checksum, FEAT_INODE_CHECKSUM);
 F2FS_FEATURE_RO_ATTR(flexible_inline_xattr, FEAT_FLEXIBLE_INLINE_XATTR);
 F2FS_FEATURE_RO_ATTR(quota_ino, FEAT_QUOTA_INO);
 F2FS_FEATURE_RO_ATTR(inode_crtime, FEAT_INODE_CRTIME);
+F2FS_FEATURE_RO_ATTR(lost_found, FEAT_LOST_FOUND);
 
 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
 static struct attribute *f2fs_attrs[] = {
@@ -441,6 +447,7 @@ static struct attribute *f2fs_feat_attrs[] = {
 	ATTR_LIST(flexible_inline_xattr),
 	ATTR_LIST(quota_ino),
 	ATTR_LIST(inode_crtime),
+	ATTR_LIST(lost_found),
 	NULL,
 };
 
-- 
2.14.1


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Re: [RFC PATCH v4 1/3] f2fs: introduce F2FS_FEATURE_LOST_FOUND feature

[Chao Yu]

On 2018/3/9 15:53, Sheng Yong wrote:
> This patch introduces a new feature, F2FS_FEATURE_LOST_FOUND, which
> is set by mkfs. mkfs creates a directory named lost+found, which saves
> unreachable files. If fsck finds a file which has no parent, or its
> parent is removed by fsck, the file will be placed under lost+found
> directory by fsck.
> 
> lost+found directory could not be encrypted. As a result, the root
> directory cannot be encrypted too. So if LOST_FOUND feature is enabled,
> let's avoid to encrypt root directory.
> 
> Signed-off-by: Sheng Yong <shengyong1@huawei.com>

Reviewed-by: Chao Yu <yuchao0@huawei.com>

Thanks,

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[RFC PATCH v4 2/3] f2fs: introduce a new mount option test_dummy_encryption

[Sheng Yong]

This patch introduces a new mount option `test_dummy_encryption' to
allow fscrypt to create a fake fscrypt context. This is used by xfstests.

Signed-off-by: Sheng Yong <shengyong1@huawei.com>
---
 fs/f2fs/dir.c   |  4 +++-
 fs/f2fs/f2fs.h  | 11 +++++++++++
 fs/f2fs/namei.c |  9 ++++++---
 fs/f2fs/super.c | 31 +++++++++++++++++++++++++++++++
 4 files changed, 51 insertions(+), 4 deletions(-)

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 797eb05cb538..73ddc35fba4f 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -361,6 +361,7 @@ struct page *init_inode_metadata(struct inode *inode, struct inode *dir,
 			struct page *dpage)
 {
 	struct page *page;
+	int dummy_encrypt = DUMMY_ENCRYPTION_ENABLED(F2FS_I_SB(dir));
 	int err;
 
 	if (is_inode_flag_set(inode, FI_NEW_INODE)) {
@@ -387,7 +388,8 @@ struct page *init_inode_metadata(struct inode *inode, struct inode *dir,
 		if (err)
 			goto put_error;
 
-		if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) {
+		if ((f2fs_encrypted_inode(dir) || dummy_encrypt) &&
+					f2fs_may_encrypt(inode)) {
 			err = fscrypt_inherit_context(dir, inode, page, false);
 			if (err)
 				goto put_error;
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 31f39ab7fce4..c0dbd8b6050b 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1053,6 +1053,15 @@ enum {
 	ALLOC_MODE_REUSE,	/* reuse segments as much as possible */
 };
 
+#define F2FS_MF_TEST_DUMMY_ENCRYPTION	0x0001
+
+#ifdef CONFIG_F2FS_FS_ENCRYPTION
+#define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->mount_flags & \
+						F2FS_MF_TEST_DUMMY_ENCRYPTION))
+#else
+#define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
+#endif
+
 struct f2fs_sb_info {
 	struct super_block *sb;			/* pointer to VFS super block */
 	struct proc_dir_entry *s_proc;		/* proc entry */
@@ -1242,6 +1251,8 @@ struct f2fs_sb_info {
 
 	/* segment allocation policy */
 	int alloc_mode;
+
+	unsigned int mount_flags;
 };
 
 #ifdef CONFIG_F2FS_FAULT_INJECTION
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 318dfe870cb5..5dd6a112e13d 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -78,7 +78,8 @@ static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
 	set_inode_flag(inode, FI_NEW_INODE);
 
 	/* If the directory encrypted, then we should encrypt the inode. */
-	if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
+	if ((f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) &&
+				f2fs_may_encrypt(inode))
 		f2fs_set_encrypted_inode(inode);
 
 	if (f2fs_sb_has_extra_attr(sbi->sb)) {
@@ -788,10 +789,12 @@ static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 
 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 {
-	if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
+	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
+
+	if (unlikely(f2fs_cp_error(sbi)))
 		return -EIO;
 
-	if (f2fs_encrypted_inode(dir)) {
+	if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
 		int err = fscrypt_get_encryption_info(dir);
 		if (err)
 			return err;
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index b9a6b97c3bd3..345e4f63f6fc 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -131,6 +131,7 @@ enum {
 	Opt_jqfmt_vfsv1,
 	Opt_whint,
 	Opt_alloc,
+	Opt_test_dummy_encryption,
 	Opt_err,
 };
 
@@ -186,6 +187,7 @@ static match_table_t f2fs_tokens = {
 	{Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
 	{Opt_whint, "whint_mode=%s"},
 	{Opt_alloc, "alloc_mode=%s"},
+	{Opt_test_dummy_encryption, "test_dummy_encryption"},
 	{Opt_err, NULL},
 };
 
@@ -719,6 +721,16 @@ static int parse_options(struct super_block *sb, char *options)
 			}
 			kfree(name);
 			break;
+		case Opt_test_dummy_encryption:
+#ifdef CONFIG_F2FS_FS_ENCRYPTION
+			sbi->mount_flags |= F2FS_MF_TEST_DUMMY_ENCRYPTION;
+			f2fs_msg(sb, KERN_INFO,
+					"Test dummy encryption mode enabled");
+#else
+			f2fs_msg(sb, KERN_INFO,
+					"Test dummy encryption mount option ignored");
+#endif
+			break;
 		default:
 			f2fs_msg(sb, KERN_ERR,
 				"Unrecognized mount option \"%s\" or missing value",
@@ -1282,6 +1294,10 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
 		seq_printf(seq, ",whint_mode=%s", "user-based");
 	else if (sbi->whint_mode == WHINT_MODE_FS)
 		seq_printf(seq, ",whint_mode=%s", "fs-based");
+#ifdef CONFIG_F2FS_FS_ENCRYPTION
+	if (sbi->mount_flags & F2FS_MF_TEST_DUMMY_ENCRYPTION)
+		seq_puts(seq, ",test_dummy_encryption");
+#endif
 
 	if (sbi->alloc_mode == ALLOC_MODE_DEFAULT)
 		seq_printf(seq, ",alloc_mode=%s", "default");
@@ -1882,6 +1898,11 @@ static int f2fs_set_context(struct inode *inode, const void *ctx, size_t len,
 				ctx, len, fs_data, XATTR_CREATE);
 }
 
+static bool f2fs_dummy_context(struct inode *inode)
+{
+	return DUMMY_ENCRYPTION_ENABLED(F2FS_I_SB(inode));
+}
+
 static unsigned f2fs_max_namelen(struct inode *inode)
 {
 	return S_ISLNK(inode->i_mode) ?
@@ -1892,6 +1913,7 @@ static const struct fscrypt_operations f2fs_cryptops = {
 	.key_prefix	= "f2fs:",
 	.get_context	= f2fs_get_context,
 	.set_context	= f2fs_set_context,
+	.dummy_context	= f2fs_dummy_context,
 	.empty_dir	= f2fs_empty_dir,
 	.max_namelen	= f2fs_max_namelen,
 };
@@ -2620,6 +2642,15 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 	if (err)
 		goto free_options;
 
+	if (DUMMY_ENCRYPTION_ENABLED(sbi) &&
+			(sb_rdonly(sb) || !f2fs_sb_has_encrypt(sb))) {
+		f2fs_msg(sb, KERN_ERR,
+			"Encrypt feature is off or filesystem is read-only");
+		err = -EINVAL;
+		retry = false;
+		goto free_options;
+	}
+
 	sbi->max_file_blocks = max_file_blocks();
 	sb->s_maxbytes = sbi->max_file_blocks <<
 				le32_to_cpu(raw_super->log_blocksize);
-- 
2.14.1


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Re: [RFC PATCH v4 2/3] f2fs: introduce a new mount option test_dummy_encryption

[Chao Yu]

On 2018/3/9 15:53, Sheng Yong wrote:
> This patch introduces a new mount option `test_dummy_encryption' to
> allow fscrypt to create a fake fscrypt context. This is used by xfstests.

It needs to add doc for this new mount option.

> 
> Signed-off-by: Sheng Yong <shengyong1@huawei.com>
> ---
>  fs/f2fs/dir.c   |  4 +++-
>  fs/f2fs/f2fs.h  | 11 +++++++++++
>  fs/f2fs/namei.c |  9 ++++++---
>  fs/f2fs/super.c | 31 +++++++++++++++++++++++++++++++
>  4 files changed, 51 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
> index 797eb05cb538..73ddc35fba4f 100644
> --- a/fs/f2fs/dir.c
> +++ b/fs/f2fs/dir.c
> @@ -361,6 +361,7 @@ struct page *init_inode_metadata(struct inode *inode, struct inode *dir,
>  			struct page *dpage)
>  {
>  	struct page *page;
> +	int dummy_encrypt = DUMMY_ENCRYPTION_ENABLED(F2FS_I_SB(dir));
>  	int err;
>  
>  	if (is_inode_flag_set(inode, FI_NEW_INODE)) {
> @@ -387,7 +388,8 @@ struct page *init_inode_metadata(struct inode *inode, struct inode *dir,
>  		if (err)
>  			goto put_error;
>  
> -		if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) {
> +		if ((f2fs_encrypted_inode(dir) || dummy_encrypt) &&
> +					f2fs_may_encrypt(inode)) {
>  			err = fscrypt_inherit_context(dir, inode, page, false);
>  			if (err)
>  				goto put_error;
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 31f39ab7fce4..c0dbd8b6050b 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1053,6 +1053,15 @@ enum {
>  	ALLOC_MODE_REUSE,	/* reuse segments as much as possible */
>  };
>  
> +#define F2FS_MF_TEST_DUMMY_ENCRYPTION	0x0001
> +
> +#ifdef CONFIG_F2FS_FS_ENCRYPTION
> +#define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->mount_flags & \
> +						F2FS_MF_TEST_DUMMY_ENCRYPTION))
> +#else
> +#define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
> +#endif
> +
>  struct f2fs_sb_info {
>  	struct super_block *sb;			/* pointer to VFS super block */
>  	struct proc_dir_entry *s_proc;		/* proc entry */
> @@ -1242,6 +1251,8 @@ struct f2fs_sb_info {
>  
>  	/* segment allocation policy */
>  	int alloc_mode;
> +
> +	unsigned int mount_flags;
>  };
>  
>  #ifdef CONFIG_F2FS_FAULT_INJECTION
> diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
> index 318dfe870cb5..5dd6a112e13d 100644
> --- a/fs/f2fs/namei.c
> +++ b/fs/f2fs/namei.c
> @@ -78,7 +78,8 @@ static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
>  	set_inode_flag(inode, FI_NEW_INODE);
>  
>  	/* If the directory encrypted, then we should encrypt the inode. */
> -	if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
> +	if ((f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) &&
> +				f2fs_may_encrypt(inode))
>  		f2fs_set_encrypted_inode(inode);
>  
>  	if (f2fs_sb_has_extra_attr(sbi->sb)) {
> @@ -788,10 +789,12 @@ static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
>  
>  static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
>  {
> -	if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
> +	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
> +
> +	if (unlikely(f2fs_cp_error(sbi)))
>  		return -EIO;
>  
> -	if (f2fs_encrypted_inode(dir)) {
> +	if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {

Why we need to add this condition here?

>  		int err = fscrypt_get_encryption_info(dir);
>  		if (err)
>  			return err;
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index b9a6b97c3bd3..345e4f63f6fc 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -131,6 +131,7 @@ enum {
>  	Opt_jqfmt_vfsv1,
>  	Opt_whint,
>  	Opt_alloc,
> +	Opt_test_dummy_encryption,
>  	Opt_err,
>  };
>  
> @@ -186,6 +187,7 @@ static match_table_t f2fs_tokens = {
>  	{Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
>  	{Opt_whint, "whint_mode=%s"},
>  	{Opt_alloc, "alloc_mode=%s"},
> +	{Opt_test_dummy_encryption, "test_dummy_encryption"},
>  	{Opt_err, NULL},
>  };
>  
> @@ -719,6 +721,16 @@ static int parse_options(struct super_block *sb, char *options)
>  			}
>  			kfree(name);
>  			break;
> +		case Opt_test_dummy_encryption:
> +#ifdef CONFIG_F2FS_FS_ENCRYPTION
> +			sbi->mount_flags |= F2FS_MF_TEST_DUMMY_ENCRYPTION;
> +			f2fs_msg(sb, KERN_INFO,
> +					"Test dummy encryption mode enabled");
> +#else
> +			f2fs_msg(sb, KERN_INFO,
> +					"Test dummy encryption mount option ignored");
> +#endif
> +			break;
>  		default:
>  			f2fs_msg(sb, KERN_ERR,
>  				"Unrecognized mount option \"%s\" or missing value",
> @@ -1282,6 +1294,10 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
>  		seq_printf(seq, ",whint_mode=%s", "user-based");
>  	else if (sbi->whint_mode == WHINT_MODE_FS)
>  		seq_printf(seq, ",whint_mode=%s", "fs-based");
> +#ifdef CONFIG_F2FS_FS_ENCRYPTION
> +	if (sbi->mount_flags & F2FS_MF_TEST_DUMMY_ENCRYPTION)
> +		seq_puts(seq, ",test_dummy_encryption");
> +#endif
>  
>  	if (sbi->alloc_mode == ALLOC_MODE_DEFAULT)
>  		seq_printf(seq, ",alloc_mode=%s", "default");
> @@ -1882,6 +1898,11 @@ static int f2fs_set_context(struct inode *inode, const void *ctx, size_t len,
>  				ctx, len, fs_data, XATTR_CREATE);
>  }
>  
> +static bool f2fs_dummy_context(struct inode *inode)
> +{
> +	return DUMMY_ENCRYPTION_ENABLED(F2FS_I_SB(inode));
> +}
> +
>  static unsigned f2fs_max_namelen(struct inode *inode)
>  {
>  	return S_ISLNK(inode->i_mode) ?
> @@ -1892,6 +1913,7 @@ static const struct fscrypt_operations f2fs_cryptops = {
>  	.key_prefix	= "f2fs:",
>  	.get_context	= f2fs_get_context,
>  	.set_context	= f2fs_set_context,
> +	.dummy_context	= f2fs_dummy_context,
>  	.empty_dir	= f2fs_empty_dir,
>  	.max_namelen	= f2fs_max_namelen,
>  };
> @@ -2620,6 +2642,15 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
>  	if (err)
>  		goto free_options;
>  
> +	if (DUMMY_ENCRYPTION_ENABLED(sbi) &&
> +			(sb_rdonly(sb) || !f2fs_sb_has_encrypt(sb))) {

Use f2fs_readonly() here which can wrap sb_rdonly()?

> +		f2fs_msg(sb, KERN_ERR,
> +			"Encrypt feature is off or filesystem is read-only");
> +		err = -EINVAL;
> +		retry = false;
> +		goto free_options;
> +	}

How about moving this check into parse_options(), so we can check this condition
in remount_fs() too.

Thanks,

> +
>  	sbi->max_file_blocks = max_file_blocks();
>  	sb->s_maxbytes = sbi->max_file_blocks <<
>  				le32_to_cpu(raw_super->log_blocksize);
> 

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Re: [RFC PATCH v4 2/3] f2fs: introduce a new mount option test_dummy_encryption

[Sheng Yong]

Hi, Chao

On 2018/3/9 20:32, Chao Yu wrote:
> On 2018/3/9 15:53, Sheng Yong wrote:
>> This patch introduces a new mount option `test_dummy_encryption' to
>> allow fscrypt to create a fake fscrypt context. This is used by xfstests.
> 
> It needs to add doc for this new mount option.
>
Oh. Right, I'll update the doc.

>>
[...]
>>   static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
>>   {
>> -	if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
>> +	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
>> +
>> +	if (unlikely(f2fs_cp_error(sbi)))
>>   		return -EIO;
>>   
>> -	if (f2fs_encrypted_inode(dir)) {
>> +	if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
> 
> Why we need to add this condition here?
> 
I think it's both OK if we add the check or not. But since commit 304eecc3462e ("f2fs crypto:
check encryption for tmpfile) add f2fs_encrypt_inode() to check encryption earlier, IMO, we
should do the same check if test_dummy_encryption is enabled according to the semantic.

>>   		int err = fscrypt_get_encryption_info(dir);
>>   		if (err)
>>   			return err;
[...]
>> @@ -2620,6 +2642,15 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
>>   	if (err)
>>   		goto free_options;
>>   
>> +	if (DUMMY_ENCRYPTION_ENABLED(sbi) &&
>> +			(sb_rdonly(sb) || !f2fs_sb_has_encrypt(sb))) {
> 
> Use f2fs_readonly() here which can wrap sb_rdonly()?
> OK.

>> +		f2fs_msg(sb, KERN_ERR,
>> +			"Encrypt feature is off or filesystem is read-only");
>> +		err = -EINVAL;
>> +		retry = false;
>> +		goto free_options;
>> +	}
> 
> How about moving this check into parse_options(), so we can check this condition
> in remount_fs() too.
> 
OK.

Thanks,
Sheng

> Thanks,
> 
>> +
>>   	sbi->max_file_blocks = max_file_blocks();
>>   	sb->s_maxbytes = sbi->max_file_blocks <<
>>   				le32_to_cpu(raw_super->log_blocksize);
>>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-fscrypt" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
> .
> 


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[RFC PATCH 3/3] ext4: do not allow mount with test_dummy_encryption if encrypt not set

[Sheng Yong]

When mounting with test_dummy_encryption option, if encrypt feature
is not set, return fail instead of setting encrypt feature forcely.

CC: linux-ext4@vger.kernel.org
Signed-off-by: Sheng Yong <shengyong1@huawei.com>
---
 fs/ext4/super.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 39bf464c35f1..c424af0ccda9 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4151,8 +4151,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 
 	if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
 	    !ext4_has_feature_encrypt(sb)) {
-		ext4_set_feature_encrypt(sb);
-		ext4_commit_super(sb, 1);
+		ext4_msg(sb, KERN_ERR,
+			 "Encrypt does not support or filesystem is read-only");
+		goto failed_mount_wq;
 	}
 
 	/*
-- 
2.14.1


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