The commit is pushed to "branch-rh7-3.10.0-123.1.2-ovz" and will appear at
https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-123.1.2.vz7.5.1
------>
commit 97ba7085978ee4245beaf43c5543cb230094189d
Author: Andrey Smetanin <asmeta...@virtuozzo.com>
Date: Tue May 19 08:27:06 2015 +0400
ploop: expose open_count to sysfs
The patch shows number of opened instances of ploop-device (plo->open_count)
in /sys/block/ploopN/pstate/open_count. This will allow userspace to decide
whether a ploop-device is used by someone (e.g. backup) by scanning the
open_count for all ploop-devices.
https://jira.sw.ru/browse/PSBM-24754
Signed-off-by: Maxim Patlasov <mpatla...@parallels.com>
---
drivers/block/ploop/sysfs.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/block/ploop/sysfs.c b/drivers/block/ploop/sysfs.c
index 5c31826..3ef53ac 100644
--- a/drivers/block/ploop/sysfs.c
+++ b/drivers/block/ploop/sysfs.c
@@ -383,6 +383,11 @@ static u32 show_event(struct ploop_device * plo)
return ret;
}
+static u32 show_open_count(struct ploop_device * plo)
+{
+ return atomic_read(&plo->open_count);
+}
+
static ssize_t print_cookie(struct ploop_device * plo, char * page)
{
return sprintf(page, "%s\n", plo->cookie);
@@ -466,6 +471,7 @@ static struct attribute *state_attributes[] = {
_A(top),
_A(event),
_A3(cookie),
+ _A(open_count),
NULL
};
_______________________________________________
Devel mailing list
Devel@openvz.org
https://lists.openvz.org/mailman/listinfo/devel
