ext4: refactor and move ext4_ioctl_get_encryption_pwsalt()

This patch move code for FS_IOC_GET_ENCRYPTION_PWSALT case into
ext4's crypto.c file, i.e. ext4_ioctl_get_encryption_pwsalt()
and uuid_is_zero(). This is mostly refactoring logic and should
not affect any functionality change.

Suggested-by: Eric Biggers <[e-mail]>
Reviewed-by: Eric Biggers <[e-mail]>
Signed-off-by: Ritesh Harjani <[e-mail]>
Link: https://lore.kernel.org/r/5af[e-mail]
Signed-off-by: Theodore Ts'o <[e-mail]>

fs/ext4/crypto.c

···
 // SPDX-License-Identifier: GPL-2.0
 
 #include <linux/quotaops.h>
+#include <linux/uuid.h>
 
 #include "ext4.h"
 #include "xattr.h"
···
 	kfree(fname->cf_name.name);
 	fname->cf_name.name = NULL;
 #endif
+}
+
+static bool uuid_is_zero(__u8 u[16])
+{
+	int i;
+
+	for (i = 0; i < 16; i++)
+		if (u[i])
+			return false;
+	return true;
+}
+
+int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg)
+{
+	struct super_block *sb = file_inode(filp)->i_sb;
+	struct ext4_sb_info *sbi = EXT4_SB(sb);
+	int err, err2;
+	handle_t *handle;
+
+	if (!ext4_has_feature_encrypt(sb))
+		return -EOPNOTSUPP;
+
+	if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
+		err = mnt_want_write_file(filp);
+		if (err)
+			return err;
+		handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
+		if (IS_ERR(handle)) {
+			err = PTR_ERR(handle);
+			goto pwsalt_err_exit;
+		}
+		err = ext4_journal_get_write_access(handle, sb, sbi->s_sbh,
+						    EXT4_JTR_NONE);
+		if (err)
+			goto pwsalt_err_journal;
+		lock_buffer(sbi->s_sbh);
+		generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
+		ext4_superblock_csum_set(sb);
+		unlock_buffer(sbi->s_sbh);
+		err = ext4_handle_dirty_metadata(handle, NULL, sbi->s_sbh);
+pwsalt_err_journal:
+		err2 = ext4_journal_stop(handle);
+		if (err2 && !err)
+			err = err2;
+pwsalt_err_exit:
+		mnt_drop_write_file(filp);
+		if (err)
+			return err;
+	}
+
+	if (copy_to_user(arg, sbi->s_es->s_encrypt_pw_salt, 16))
+		return -EFAULT;
+	return 0;
 }
 
 static int ext4_get_context(struct inode *inode, void *ctx, size_t len)

fs/ext4/ext4.h

···
 
 void ext4_fname_free_filename(struct ext4_filename *fname);
 
+int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg);
+
 #else /* !CONFIG_FS_ENCRYPTION */
 static inline int ext4_fname_setup_filename(struct inode *dir,
 					    const struct qstr *iname,
···
 	kfree(fname->cf_name.name);
 	fname->cf_name.name = NULL;
 #endif
+}
+
+static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp,
+						   void __user *arg)
+{
+	return -EOPNOTSUPP;
 }
 #endif /* !CONFIG_FS_ENCRYPTION */
 

fs/ext4/ioctl.c

···
 #include <linux/file.h>
 #include <linux/quotaops.h>
 #include <linux/random.h>
-#include <linux/uuid.h>
 #include <linux/uaccess.h>
 #include <linux/delay.h>
 #include <linux/iversion.h>
···
 	iput(inode_bl);
 	return err;
 }
-
-#ifdef CONFIG_FS_ENCRYPTION
-static int uuid_is_zero(__u8 u[16])
-{
-	int	i;
-
-	for (i = 0; i < 16; i++)
-		if (u[i])
-			return 0;
-	return 1;
-}
-#endif
 
 /*
  * If immutable is set and we are not clearing it, we're not allowed to change
···
 			return -EOPNOTSUPP;
 		return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
 
-	case FS_IOC_GET_ENCRYPTION_PWSALT: {
-#ifdef CONFIG_FS_ENCRYPTION
-		int err, err2;
-		struct ext4_sb_info *sbi = EXT4_SB(sb);
-		handle_t *handle;
+	case FS_IOC_GET_ENCRYPTION_PWSALT:
+		return ext4_ioctl_get_encryption_pwsalt(filp, (void __user *)arg);
 
-		if (!ext4_has_feature_encrypt(sb))
-			return -EOPNOTSUPP;
-		if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
-			err = mnt_want_write_file(filp);
-			if (err)
-				return err;
-			handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
-			if (IS_ERR(handle)) {
-				err = PTR_ERR(handle);
-				goto pwsalt_err_exit;
-			}
-			err = ext4_journal_get_write_access(handle, sb,
-							    sbi->s_sbh,
-							    EXT4_JTR_NONE);
-			if (err)
-				goto pwsalt_err_journal;
-			lock_buffer(sbi->s_sbh);
-			generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
-			ext4_superblock_csum_set(sb);
-			unlock_buffer(sbi->s_sbh);
-			err = ext4_handle_dirty_metadata(handle, NULL,
-							 sbi->s_sbh);
-		pwsalt_err_journal:
-			err2 = ext4_journal_stop(handle);
-			if (err2 && !err)
-				err = err2;
-		pwsalt_err_exit:
-			mnt_drop_write_file(filp);
-			if (err)
-				return err;
-		}
-		if (copy_to_user((void __user *) arg,
-				 sbi->s_es->s_encrypt_pw_salt, 16))
-			return -EFAULT;
-		return 0;
-#else
-		return -EOPNOTSUPP;
-#endif
-	}
 	case FS_IOC_GET_ENCRYPTION_POLICY:
 		if (!ext4_has_feature_encrypt(sb))
 			return -EOPNOTSUPP;