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blkfront: add uevent for size change 

When a blkfront device is resized from dom0, emit a KOBJ_CHANGE uevent to
notify the guest about the change. This allows for custom udev rules, such
as automatically resizing a filesystem, when an event occurs.

With this patch you get these udev

KERNEL[577.206230] change   /devices/vbd-51728/block/xvdb (block)
UDEV  [577.226218] change   /devices/vbd-51728/block/xvdb (block)

Signed-off-by: Marc Olson <marcolso@amazon.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Marc Olson 2017-04-11 12:24:09 -07:00 committed by Konrad Rzeszutek Wilk
parent a2c97909f9
commit 89515d0255
1 changed files with 3 additions and 0 deletions
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3
drivers/block/xen-blkfront.c
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@ -2345,6 +2345,7 @@ static void blkfront_connect(struct blkfront_info *info)
unsigned long sector_size;
unsigned int physical_sector_size;
unsigned int binfo;
char *envp[] = { "RESIZE=1", NULL };
int err, i;
switch (info->connected) {
@ -2361,6 +2362,8 @@ static void blkfront_connect(struct blkfront_info *info)
sectors);
set_capacity(info->gd, sectors);
revalidate_disk(info->gd);
kobject_uevent_env(&disk_to_dev(info->gd)->kobj,
KOBJ_CHANGE, envp);
return;
case BLKIF_STATE_SUSPENDED: