add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/ubifs/ioctl.c
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..
@@ -1,21 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * This file is part of UBIFS.
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  *
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  * Copyright (C) 2006-2008 Nokia Corporation.
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  * Copyright (C) 2006, 2007 University of Szeged, Hungary
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License version 2 as published by
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- * the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful, but WITHOUT
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- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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- * more details.
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- *
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- * You should have received a copy of the GNU General Public License along with
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- * this program; if not, write to the Free Software Foundation, Inc., 51
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- * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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  *
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  * Authors: Zoltan Sogor
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  *          Artem Bityutskiy (Битюцкий Артём)
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@@ -29,9 +17,13 @@
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 #include "ubifs.h"
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 /* Need to be kept consistent with checked flags in ioctl2ubifs() */
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-#define UBIFS_SUPPORTED_IOCTL_FLAGS \
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+#define UBIFS_SETTABLE_IOCTL_FLAGS \
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 	(FS_COMPR_FL | FS_SYNC_FL | FS_APPEND_FL | \
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 	 FS_IMMUTABLE_FL | FS_DIRSYNC_FL)
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+
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+/* Need to be kept consistent with checked flags in ubifs2ioctl() */
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+#define UBIFS_GETTABLE_IOCTL_FLAGS \
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+	(UBIFS_SETTABLE_IOCTL_FLAGS | FS_ENCRYPT_FL)
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 /**
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  * ubifs_set_inode_flags - set VFS inode flags.
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@@ -103,6 +95,8 @@
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 		ioctl_flags |= FS_IMMUTABLE_FL;
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 	if (ubifs_flags & UBIFS_DIRSYNC_FL)
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 		ioctl_flags |= FS_DIRSYNC_FL;
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+	if (ubifs_flags & UBIFS_CRYPT_FL)
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+		ioctl_flags |= FS_ENCRYPT_FL;
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 	return ioctl_flags;
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 }
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@@ -113,26 +107,19 @@
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 	struct ubifs_inode *ui = ubifs_inode(inode);
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 	struct ubifs_info *c = inode->i_sb->s_fs_info;
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 	struct ubifs_budget_req req = { .dirtied_ino = 1,
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-					.dirtied_ino_d = ui->data_len };
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+			.dirtied_ino_d = ALIGN(ui->data_len, 8) };
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 	err = ubifs_budget_space(c, &req);
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 	if (err)
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 		return err;
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-	/*
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-	 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
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-	 * the relevant capability.
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-	 */
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 	mutex_lock(&ui->ui_mutex);
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 	oldflags = ubifs2ioctl(ui->flags);
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-	if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
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-		if (!capable(CAP_LINUX_IMMUTABLE)) {
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-			err = -EPERM;
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-			goto out_unlock;
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-		}
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-	}
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+	err = vfs_ioc_setflags_prepare(inode, oldflags, flags);
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+	if (err)
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+		goto out_unlock;
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-	ui->flags &= ~ioctl2ubifs(UBIFS_SUPPORTED_IOCTL_FLAGS);
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+	ui->flags &= ~ioctl2ubifs(UBIFS_SETTABLE_IOCTL_FLAGS);
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 	ui->flags |= ioctl2ubifs(flags);
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 	ubifs_set_inode_flags(inode);
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 	inode->i_ctime = current_time(inode);
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@@ -147,7 +134,6 @@
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 	return err;
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 out_unlock:
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-	ubifs_err(c, "can't modify inode %lu attributes", inode->i_ino);
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 	mutex_unlock(&ui->ui_mutex);
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 	ubifs_release_budget(c, &req);
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 	return err;
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@@ -175,8 +161,9 @@
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 		if (get_user(flags, (int __user *) arg))
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 			return -EFAULT;
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-		if (flags & ~UBIFS_SUPPORTED_IOCTL_FLAGS)
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+		if (flags & ~UBIFS_GETTABLE_IOCTL_FLAGS)
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 			return -EOPNOTSUPP;
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+		flags &= UBIFS_SETTABLE_IOCTL_FLAGS;
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 		if (!S_ISDIR(inode->i_mode))
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 			flags &= ~FS_DIRSYNC_FL;
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@@ -194,7 +181,6 @@
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 		return err;
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 	}
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 	case FS_IOC_SET_ENCRYPTION_POLICY: {
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-#ifdef CONFIG_FS_ENCRYPTION
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 		struct ubifs_info *c = inode->i_sb->s_fs_info;
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 		err = ubifs_enable_encryption(c);
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@@ -202,17 +188,9 @@
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 			return err;
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 		return fscrypt_ioctl_set_policy(file, (const void __user *)arg);
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-#else
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-		return -EOPNOTSUPP;
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-#endif
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 	}
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-	case FS_IOC_GET_ENCRYPTION_POLICY: {
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-#ifdef CONFIG_FS_ENCRYPTION
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+	case FS_IOC_GET_ENCRYPTION_POLICY:
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 		return fscrypt_ioctl_get_policy(file, (void __user *)arg);
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-#else
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-		return -EOPNOTSUPP;
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-#endif
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-	}
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 	case FS_IOC_GET_ENCRYPTION_POLICY_EX:
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 		return fscrypt_ioctl_get_policy_ex(file, (void __user *)arg);