52 lines
1.3 KiB
Plaintext
52 lines
1.3 KiB
Plaintext
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From: Hannes Reinecke <hare@suse.de>
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Subject: Emulate BLKRRPART on device-mapper
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Patch-mainline: not yet
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Partitions on device-mapper devices are managed by kpartx (if at
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all). So if we were just to send out a 'change' event if someone
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called BLKRRPART on these devices, kpartx will be triggered via udev
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and can manage the partitions accordingly.
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Signed-off-by: Hannes Reinecke <hare@suse.de>
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---
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drivers/md/dm.c | 22 ++++++++++++++--------
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1 file changed, 14 insertions(+), 8 deletions(-)
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--- a/drivers/md/dm.c
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+++ b/drivers/md/dm.c
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@@ -409,19 +409,25 @@ static int dm_blk_ioctl(struct block_dev
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if (!map || !dm_table_get_size(map))
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goto out;
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- /* We only support devices that have a single target */
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- if (dm_table_get_num_targets(map) != 1)
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- goto out;
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-
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- tgt = dm_table_get_target(map, 0);
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-
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if (dm_suspended_md(md)) {
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r = -EAGAIN;
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goto out;
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}
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- if (tgt->type->ioctl)
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- r = tgt->type->ioctl(tgt, cmd, arg);
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+ if (cmd == BLKRRPART) {
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+ /* Emulate Re-read partitions table */
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+ kobject_uevent(&disk_to_dev(md->disk)->kobj, KOBJ_CHANGE);
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+ r = 0;
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+ } else {
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+ /* We only support devices that have a single target */
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+ if (dm_table_get_num_targets(map) != 1)
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+ goto out;
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+
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+ tgt = dm_table_get_target(map, 0);
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+
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+ if (tgt->type->ioctl)
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+ r = tgt->type->ioctl(tgt, cmd, arg);
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+ }
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out:
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dm_table_put(map);
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