From: Coly Li colyli@suse.de
commit 695277f16b3a102fcc22c97fdf2de77c7b19f0b3 upstream.
This reverts commit 6147305c73e4511ca1a975b766b97a779d442567.
Although this patch helps the failed bcache device to stop faster when too many I/O errors detected on corresponding cached device, setting CACHE_SET_IO_DISABLE bit to cache set c->flags was not a good idea. This operation will disable all I/Os on cache set, which means other attached bcache devices won't work neither.
Without this patch, the failed bcache device can also be stopped eventually if internal I/O accomplished (e.g. writeback). Therefore here I revert it.
Fixes: 6147305c73e4 ("bcache: set CACHE_SET_IO_DISABLE in bch_cached_dev_error()") Reported-by: Yong Li mr.liyong@qq.com Signed-off-by: Coly Li colyli@suse.de Cc: stable@vger.kernel.org Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/md/bcache/super.c | 17 ----------------- 1 file changed, 17 deletions(-)
--- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -1429,8 +1429,6 @@ int bch_flash_dev_create(struct cache_se
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;
@@ -1441,21 +1439,6 @@ bool bch_cached_dev_error(struct cached_ 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_info("CACHE_SET_IO_DISABLE already set"); - bcache_device_stop(&dc->disk); return true; }