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rbd: add force close option

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This adds a force close option, so we can force the unmapping
of a rbd device that is open. If a path/device is blacklisted, apps
like multipathd can map a new device and then unmap the old one.
The unmapping cleanup would then be handled by the generic hotunplug
code paths in multipahd like is done for iSCSI, FC/FCOE, SAS, etc.

Signed-off-by: Mike Christie <[email protected]>
Signed-off-by: Ilya Dryomov <[email protected]>
This commit is contained in:
Mike Christie 2016-08-18 18:38:45 +02:00 • committed by Ilya Dryomov
commit 0276dca6c1
2 changed files with 33 additions and 12 deletions
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35
drivers/block/rbd.c
View file

@ -6347,18 +6347,26 @@ static ssize_t do_rbd_remove(struct bus_type *bus,
struct rbd_device *rbd_dev = NULL;
struct list_head *tmp;
int dev_id;
unsigned long ul;
char opt_buf[6];
bool already = false;
bool force = false;
int ret;
ret = kstrtoul(buf, 10, &ul);
if (ret)
return ret;
/* convert to int; abort if we lost anything in the conversion */
dev_id = (int)ul;
if (dev_id != ul)
dev_id = -1;
opt_buf[0] = '\0';
sscanf(buf, "%d %5s", &dev_id, opt_buf);
if (dev_id < 0) {
pr_err("dev_id out of range\n");
return -EINVAL;
}
if (opt_buf[0] != '\0') {
if (!strcmp(opt_buf, "force")) {
force = true;
} else {
pr_err("bad remove option at '%s'\n", opt_buf);
return -EINVAL;
}
}
ret = -ENOENT;
spin_lock(&rbd_dev_list_lock);
@ -6371,7 +6379,7 @@ static ssize_t do_rbd_remove(struct bus_type *bus,
}
if (!ret) {
spin_lock_irq(&rbd_dev->lock);
if (rbd_dev->open_count)
if (rbd_dev->open_count && !force)
ret = -EBUSY;
else
already = test_and_set_bit(RBD_DEV_FLAG_REMOVING,
@ -6382,6 +6390,15 @@ static ssize_t do_rbd_remove(struct bus_type *bus,
if (ret < 0 || already)
return ret;
if (force) {
/*
* Prevent new IO from being queued and wait for existing
* IO to complete/fail.
*/
blk_mq_freeze_queue(rbd_dev->disk->queue);
blk_set_queue_dying(rbd_dev->disk->queue);
}
down_write(&rbd_dev->lock_rwsem);
if (__rbd_is_lock_owner(rbd_dev))
rbd_unlock(rbd_dev);