[PATCH 09/29] Revert "bcache: set CACHE_SET_IO_DISABLE in bch_cached_dev_error()"
From: Coly Li <hidden>
Date: 2019-06-14 13:14:41
Also in:
linux-bcache, stable
Subsystem:
bcache (block layer cache), the rest · Maintainers:
Coly Li, Kent Overstreet, Linus Torvalds
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 <redacted>
Signed-off-by: Coly Li <redacted>
Cc: stable@vger.kernel.org
---
drivers/md/bcache/super.c | 17 -----------------
1 file changed, 17 deletions(-)
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 1b63ac876169..eaaa046fd95d 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c@@ -1437,8 +1437,6 @@ 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;
@@ -1449,21 +1447,6 @@ 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_info("CACHE_SET_IO_DISABLE already set"); - bcache_device_stop(&dc->disk); return true; }
--
2.16.4