[PATCH 3/7] partition: allow to reparse a partition table

[Sascha Hauer]

On Thu, Feb 15, 2024 at 12:07:52PM +0100, Marco Felsch wrote:
> On 24-02-15, Sascha Hauer wrote:
> > The partition table of a block device may change when it is written to.
> > Allow to reparse the partition table when this happens.
> > This is easy when none of the partitions is opened, in that case just
> > remove the old partitions and call parse_partition_table() again.
> > When a partition is opened (including mounted) we can't remove it. In
> > that case continue with the old partition table and print a warning.
> > 
> > Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
> 
> Just two nits, to make cdev access more opaque.
> 
> > ---
> >  common/partitions.c | 20 ++++++++++++++++++++
> >  include/disks.h     |  1 +
> >  2 files changed, 21 insertions(+)
> > 
> > diff --git a/common/partitions.c b/common/partitions.c
> > index 78b68276c3..cfcd0e080b 100644
> > --- a/common/partitions.c
> > +++ b/common/partitions.c
> > @@ -154,6 +154,26 @@ int parse_partition_table(struct block_device *blk)
> >  	return rc;
> >  }
> >  
> > +int reparse_partition_table(struct block_device *blk)
> > +{
> > +	struct cdev *cdev = &blk->cdev;
> > +	struct cdev *c, *tmp;
> > +
> > +	list_for_each_entry(c, &cdev->partitions, partition_entry) {
> > +		if (c->open) {
> 
> 		if (cdev_is_open(c))

I was assuming this function already exists, but it doesn't. I'll leave
that for a later exercise.

Sascha

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