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bcache: fix busy loop with too many errors

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When bcache tries to write data to a faulty device,
it may get out of caching blocks and then just busy-loops
on a CPU - so this check protects this by checking
if there is already max_io (~64) errored blocks.
This commit is contained in:
Zdenek Kabelac 2020-10-02 17:42:50 +02:00
parent 41f9e372c0
commit 0fe58fc54f
2 changed files with 6 additions and 0 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 2.03.11 - Version 2.03.11 -
================================== ==================================
Fix bcache when device has too many failing writes.
Fix bcache waiting for IO completion with failing disks. Fix bcache waiting for IO completion with failing disks.
Configure use own python path name order to prefer using python3. Configure use own python path name order to prefer using python3.
Add configure --enable-editline support as an alternative to readline. Add configure --enable-editline support as an alternative to readline.

5
lib/device/bcache.c
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@ -964,6 +964,11 @@ static struct block *_new_block(struct bcache *cache, int di, block_address i, b
if (dm_list_empty(&cache->io_pending)) if (dm_list_empty(&cache->io_pending))
_writeback(cache, 16); // FIXME: magic number _writeback(cache, 16); // FIXME: magic number
_wait_all(cache); _wait_all(cache);
if (dm_list_size(&cache->errored) >= cache->max_io) {
log_debug("bcache no new blocks for di %d index %u with >%d errors.",
di, (uint32_t) i, cache->max_io);
return NULL;
}
} else { } else {
log_debug("bcache no new blocks for di %d index %u", log_debug("bcache no new blocks for di %d index %u",
di, (uint32_t) i); di, (uint32_t) i);