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Revert "bcache: set CACHE_SET_IO_DISABLE in bch_cached_dev_error()" 

This reverts commit 6147305c73.

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: 6147305c73 ("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>
This commit is contained in:
Coly Li 2019-06-28 19:59:27 +08:00 committed by Jens Axboe
parent 0ae49cb7aa
commit 695277f16b
1 changed files with 0 additions and 17 deletions
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17
drivers/md/bcache/super.c
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@ -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;
}