Blame SOURCES/lvm2-2_02_182-bcache-reduce-MAX_IO-to-256.patch

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 WHATS_NEW           |  1 +
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 lib/device/bcache.c | 10 +++++++++-
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 2 files changed, 10 insertions(+), 1 deletion(-)
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diff --git a/WHATS_NEW b/WHATS_NEW
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index 47db4a3..8063364 100644
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--- a/WHATS_NEW
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+++ b/WHATS_NEW
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@@ -10,6 +10,7 @@ Version 2.02.182 -
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   Fix change of monitoring in clustered volumes.
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   Fix lvconvert striped/raid0/raid0_meta -> raid6 regression.
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   Add After=rbdmap.service to {lvm2-activation-net,blk-availability}.service.
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+  Reduce max concurrent aios to avoid EMFILE with many devices.
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   Fix lvconvert conversion attempts to linear.
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   Fix lvconvert raid0/raid0_meta -> striped regression.
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   Fix lvconvert --splitmirror for mirror type (2.02.178).
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diff --git a/lib/device/bcache.c b/lib/device/bcache.c
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index 6886b74..7384a32 100644
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--- a/lib/device/bcache.c
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+++ b/lib/device/bcache.c
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@@ -253,7 +253,15 @@ static bool _async_issue(struct io_engine *ioe, enum dir d, int fd,
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 	return true;
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 }
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-#define MAX_IO 1024
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+/*
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+ * MAX_IO is returned to the layer above via bcache_max_prefetches() which
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+ * tells the caller how many devices to submit io for concurrently.  There will
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+ * be an open file descriptor for each of these, so keep it low enough to avoid
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+ * reaching the default max open file limit (1024) when there are over 1024
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+ * devices being scanned.
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+ */
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+
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+#define MAX_IO 256
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 #define MAX_EVENT 64
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 static bool _async_wait(struct io_engine *ioe, io_complete_fn fn)