Messages in this thread Patch in this message | | | Date | Sat, 18 Feb 2006 02:35:47 +0100 | From | Herbert Poetzl <> | Subject | kjournald keeps reference to namespace |
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Hi Folks!
when creating a private namespace (CLONE_NS) and then mounting an ext3 filesystem, a new kernel thread (kjournald) is created, which keeps a reference to the namespace, which after the the process exits, remains and blocks access to the block device, as it is still bd_claim-ed.
this leaves a private namespace behind and a block device which cannot be opened exclusively. unmount is not an option, as the namespace is not longer reachable.
this behaviour seems to be there since ever, well since namespaces and kjournald exists :)
the following 'cruel' hack 'solves' this issue
best, Herbert
--- fs/jbd/journal.c.orig 2006-01-03 17:29:56 +0100 +++ fs/jbd/journal.c 2006-02-18 02:23:21 +0100 @@ -33,6 +33,7 @@ #include <linux/mm.h> #include <linux/suspend.h> #include <linux/pagemap.h> +#include <linux/namespace.h> #include <asm/uaccess.h> #include <asm/page.h> #include <linux/proc_fs.h> @@ -116,6 +117,13 @@ static int kjournald(void *arg) struct timer_list timer; daemonize("kjournald"); + { + struct namespace *ns = current->namespace; + + current->namespace = NULL; + put_namespace(ns); + } + /* Set up an interval timer which can be used to trigger a commit wakeup after the commit interval expires */ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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