@@ -1368,6 +1368,8 @@ int bch_flash_dev_create(struct cache_set *c, uint64_t size)
bool bch_cached_dev_error(struct cached_dev *dc)
{
+ struct cache_set *c;
+
if (!dc || test_bit(BCACHE_DEV_CLOSING, &dc->disk.flags))
return false;
@@ -1378,6 +1380,21 @@ bool bch_cached_dev_error(struct cached_dev *dc)
pr_err("stop %s: too many IO errors on backing device %s\n",
dc->disk.disk->disk_name, dc->backing_dev_name);
+ /*
+ * If the cached device is still attached to a cache set,
+ * even dc->io_disable is true and no more I/O requests
+ * accepted, cache device internal I/O (writeback scan or
+ * garbage collection) may still prevent bcache device from
+ * being stopped. So here CACHE_SET_IO_DISABLE should be
+ * set to c->flags too, to make the internal I/O to cache
+ * device rejected and stopped immediately.
+ * If c is NULL, that means the bcache device is not attached
+ * to any cache set, then no CACHE_SET_IO_DISABLE bit to set.
+ */
+ c = dc->disk.c;
+ if (c && test_and_set_bit(CACHE_SET_IO_DISABLE, &c->flags))
+ pr_warn("CACHE_SET_IO_DISABLE already set");
+
bcache_device_stop(&dc->disk);
return true;
}
Commit c7b7bd07404c5 ("bcache: add io_disable to struct cached_dev") tries to stop bcache device by calling bcache_device_stop() when too many I/O errors happened on backing device. But if there is internal I/O happening on cache device (writeback scan, garbage collection, etc), a regular I/O request triggers the internal I/Os may still holds a refcount of dc->count, and the refcount may only be dropped after the internal I/O stopped. By this patch, bch_cached_dev_error() will check if the backing device is attached to a cache set, if yes that CACHE_SET_IO_DISABLE will be set to flags of this cache set. Then internal I/Os on cache device will be rejected and stopped immediately, and the bcache device can be stopped. For people who are not familiar with the interesting refcount dependance, let me explain a bit more how the fix works. Example the writeback thread will scan cache device for dirty data writeback purpose. Before it stopps, it holds a refcount of dc->count. When CACHE_SET_IO_DISABLE bit is set, the internal I/O will stopped and the while-loop in bch_writeback_thread() quits and calls cached_dev_put() to drop dc->count. If this is the last refcount to drop, then cached_dev_detach_finish() will be called. In this call back function, in turn closure_put(dc->disk.cl) is called to drop a refcount of closure dc->disk.cl. If this is the last refcount of this closure to drop, then cached_dev_flush() will be called. Then the cached device is freed. So if CACHE_SET_IO_DISABLE is not set, the bache device can not be stopped until all inernal cache device I/O stopped. For large size cache device, and writeback thread competes locks with gc thread, there might be a quite long time to wait. Fixes: c7b7bd07404c5 ("bcache: add io_disable to struct cached_dev") Signed-off-by: Coly Li <colyli@suse.de> --- drivers/md/bcache/super.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)