add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/hfsplus/ioctl.c
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@@ -57,9 +57,8 @@
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 	return 0;
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 }
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-static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags)
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+static inline unsigned int hfsplus_getflags(struct inode *inode)
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 {
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-	struct inode *inode = file_inode(file);
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 	struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
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 	unsigned int flags = 0;
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@@ -69,6 +68,13 @@
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 		flags |= FS_APPEND_FL;
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 	if (hip->userflags & HFSPLUS_FLG_NODUMP)
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 		flags |= FS_NODUMP_FL;
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+	return flags;
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+}
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+
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+static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags)
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+{
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+	struct inode *inode = file_inode(file);
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+	unsigned int flags = hfsplus_getflags(inode);
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 	return put_user(flags, user_flags);
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 }
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@@ -78,6 +84,7 @@
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 	struct inode *inode = file_inode(file);
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 	struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
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 	unsigned int flags, new_fl = 0;
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+	unsigned int oldflags = hfsplus_getflags(inode);
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 	int err = 0;
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 	err = mnt_want_write_file(file);
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@@ -96,13 +103,9 @@
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 	inode_lock(inode);
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-	if ((flags & (FS_IMMUTABLE_FL|FS_APPEND_FL)) ||
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-	    inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
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-		if (!capable(CAP_LINUX_IMMUTABLE)) {
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-			err = -EPERM;
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-			goto out_unlock_inode;
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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_inode;
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 	/* don't silently ignore unsupported ext2 flags */
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 	if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL)) {