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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/include/linux/sunrpc/metrics.h
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@@ -30,7 +30,7 @@
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 #include <linux/ktime.h>
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 #include <linux/spinlock.h>
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-#define RPC_IOSTATS_VERS	"1.0"
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+#define RPC_IOSTATS_VERS	"1.1"
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 struct rpc_iostats {
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 	spinlock_t		om_lock;
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@@ -66,6 +66,11 @@
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 	ktime_t			om_queue,	/* queued for xmit */
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 				om_rtt,		/* RPC RTT */
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 				om_execute;	/* RPC execution */
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+	/*
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+	 * The count of operations that complete with tk_status < 0.
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+	 * These statuses usually indicate error conditions.
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+	 */
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+	unsigned long           om_error_status;
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 } ____cacheline_aligned;
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 struct rpc_task;