Commit 0d4d0bff authored by Brendan Gregg's avatar Brendan Gregg

fix biosnoop after kernel change

parent 2aefbef9
......@@ -98,11 +98,23 @@ int trace_req_completion(struct pt_regs *ctx, struct request *req)
req->rq_disk->disk_name);
}
if (req->cmd_flags & REQ_WRITE) {
/*
* The following deals with a kernel version change (in mainline 4.7, although
* it may be backported to earlier kernels) with how block request write flags
* are tested. We handle both pre- and post-change versions here. Please avoid
* kernel version tests like this as much as possible: they inflate the code,
* test, and maintenance burden.
*/
#ifdef REQ_WRITE
if (req->cmd_flags & REQ_WRITE) {
#else
if ((req->cmd_flags >> REQ_OP_SHIFT) == REQ_OP_WRITE) {
#endif
data.rwflag = 1;
} else {
data.rwflag = 0;
}
events.perf_submit(ctx, &data, sizeof(data));
start.delete(&req);
infobyreq.delete(&req);
......
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