block: rate-limit the error message from failing commands
When performing a cable pull test w/ active stress I/O using fio over a dual port Intel 82599 FCoE CNA, w/ 256LUNs on one port and about 32LUNs on the other, it is observed that the system becomes not usable due to scsi-ml being busy printing the error messages for all the failing commands. I don't believe this problem is specific to FCoE and these commands are anyway failing due to link being down (DID_NO_CONNECT), just rate-limit the messages here to solve this issue. v2->v1: use __ratelimit() as Tomas Henzl mentioned as the proper way for rate-limit per function. However, in this case, the failed i/o gets to blk_end_request_err() and then blk_update_request(), which also has to be rate-limited, as added in the v2 of this patch. v3-v2: resolved conflict to apply on current 3.6-rc3 upstream tip. Signed-off-by: Yi Zou <yi.zou@intel.com> Cc: www.Open-FCoE.org <devel@open-fcoe.org> Cc: Tomas Henzl <thenzl@redhat.com> Cc: <linux-scsi@vger.kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -2254,9 +2254,11 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
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error_type = "I/O";
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break;
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}
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printk(KERN_ERR "end_request: %s error, dev %s, sector %llu\n",
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error_type, req->rq_disk ? req->rq_disk->disk_name : "?",
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(unsigned long long)blk_rq_pos(req));
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printk_ratelimited(KERN_ERR "end_request: %s error, dev %s, sector %llu\n",
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error_type, req->rq_disk ?
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req->rq_disk->disk_name : "?",
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(unsigned long long)blk_rq_pos(req));
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}
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blk_account_io_completion(req, nr_bytes);
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