linux-kernel - Re: [PATCH 15/35] Unionfs: Common file operations

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Date:	Tue, 5 Dec 2006 22:02:10 +0100 (MET)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	"Josef 'Jeff' Sipek" <jsipek@...sunysb.edu>
cc:	linux-kernel@...r.kernel.org, torvalds@...l.org, akpm@...l.org,
	hch@...radead.org, viro@....linux.org.uk,
	linux-fsdevel@...r.kernel.org, mhalcrow@...ibm.com
Subject: Re: [PATCH 15/35] Unionfs: Common file operations



On Dec 4 2006 07:30, Josef 'Jeff' Sipek wrote:

>+long unionfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
>+{
>+	long err;
>+
>+	if ((err = unionfs_file_revalidate(file, 1)))
>+		goto out;
>+
>+	/* check if asked for local commands */
>+	switch (cmd) {
>+		case UNIONFS_IOCTL_INCGEN:
>+			/* Increment the superblock generation count */
>+			err = -EACCES;
>+			if (!capable(CAP_SYS_ADMIN))
>+				goto out;
>+			err = unionfs_ioctl_incgen(file, cmd, arg);
>+			break;
>+
>+		case UNIONFS_IOCTL_QUERYFILE:
>+			/* Return list of branches containing the given file */
>+			err = unionfs_ioctl_queryfile(file, cmd, arg);
>+			break;
>+
>+		default:
>+			/* pass the ioctl down */
>+			err = do_ioctl(file, cmd, arg);
>+			break;
>+	}
>+
>+out:
>+	return err;
>+}


I think there was an ioctl for files to find out where a particular
file lives on disk. Do you think unionfs should handle it and return
something more or less meaningful?


	-`J'
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