Generate 'change' uevents when arrays change in non-obvious ways.

When a 'container' gets started, we need udev to notice, but the
kernel has no way of knowing that a KOBJ_CHANGE event is needed.  So
send one directly via the 'uevent' sysfs attribute.

Also, uevents don't get generated when md arrays are stopped (prior to
2.6.28) so send 'change' events then too.

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 16 insertions, 0 deletions

diff --git a/sysfs.c b/sysfs.c
index 00f42ea..7f94d55 100644
--- a/sysfs.c
+++ b/sysfs.c
@@ -405,6 +405,22 @@ int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
 	return sysfs_set_str(sra, dev, name, valstr);
 }
 
+int sysfs_uevent(struct mdinfo *sra, char *event)
+{
+	char fname[50];
+	int n;
+	int fd;
+
+	sprintf(fname, "/sys/block/%s/uevent",
+		sra->sys_name);
+	fd = open(fname, O_WRONLY);
+	if (fd < 0)
+		return -1;
+	n = write(fd, event, strlen(event));
+	close(fd);
+	return 0;
+}	
+
 int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
 		       char *name, unsigned long long *val)
 {