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nvme: don't rely on the changed namespace list log

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Don't optimize our namespace rescan based on the changed namespace list
log page as userspace might have changed the content through reading
it.

Suggested-by: Keith Busch <keith.busch@linux.intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@linux.intel.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
This commit is contained in:
Christoph Hellwig 2018-06-07 13:47:33 +02:00
parent c42d7a30ab
commit f493af37ab
1 changed files with 11 additions and 25 deletions
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36
drivers/nvme/host/core.c
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@ -3197,40 +3197,28 @@ static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl, unsigned nn)
nvme_remove_invalid_namespaces(ctrl, nn);
}
static bool nvme_scan_changed_ns_log(struct nvme_ctrl *ctrl)
static void nvme_clear_changed_ns_log(struct nvme_ctrl *ctrl)
{
size_t log_size = NVME_MAX_CHANGED_NAMESPACES * sizeof(__le32);
__le32 *log;
int error, i;
bool ret = false;
int error;
log = kzalloc(log_size, GFP_KERNEL);
if (!log)
return false;
return;
/*
* We need to read the log to clear the AEN, but we don't want to rely
* on it for the changed namespace information as userspace could have
* raced with us in reading the log page, which could cause us to miss
* updates.
*/
error = nvme_get_log(ctrl, NVME_LOG_CHANGED_NS, log, log_size);
if (error) {
if (error)
dev_warn(ctrl->device,
"reading changed ns log failed: %d\n", error);
goto out_free_log;
}
if (log[0] == cpu_to_le32(0xffffffff))
goto out_free_log;
for (i = 0; i < NVME_MAX_CHANGED_NAMESPACES; i++) {
u32 nsid = le32_to_cpu(log[i]);
if (nsid == 0)
break;
dev_info(ctrl->device, "rescanning namespace %d.\n", nsid);
nvme_validate_ns(ctrl, nsid);
}
ret = true;
out_free_log:
kfree(log);
return ret;
}
static void nvme_scan_work(struct work_struct *work)
@ -3246,9 +3234,8 @@ static void nvme_scan_work(struct work_struct *work)
WARN_ON_ONCE(!ctrl->tagset);
if (test_and_clear_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events)) {
if (nvme_scan_changed_ns_log(ctrl))
goto out_sort_namespaces;
dev_info(ctrl->device, "rescanning namespaces.\n");
nvme_clear_changed_ns_log(ctrl);
}
if (nvme_identify_ctrl(ctrl, &id))
@ -3263,7 +3250,6 @@ static void nvme_scan_work(struct work_struct *work)
nvme_scan_ns_sequential(ctrl, nn);
out_free_id:
kfree(id);
out_sort_namespaces:
down_write(&ctrl->namespaces_rwsem);
list_sort(NULL, &ctrl->namespaces, ns_cmp);
up_write(&ctrl->namespaces_rwsem);