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| author | Matt Mullins | 2019-04-26 20:49:48 +0200 |
|---|---|---|
| committer | Alexei Starovoitov | 2019-04-27 04:04:19 +0200 |
| commit | ea106722c76f08002b69a6983ed84dc18958ba48 (patch) | |
| tree | 740b273cebfa9af47c98530803177034d6abb851 /drivers/block | |
| parent | bpf: add writable context for raw tracepoints (diff) | |
| download | kernel-qcow2-linux-ea106722c76f08002b69a6983ed84dc18958ba48.tar.gz kernel-qcow2-linux-ea106722c76f08002b69a6983ed84dc18958ba48.tar.xz kernel-qcow2-linux-ea106722c76f08002b69a6983ed84dc18958ba48.zip | |
nbd: trace sending nbd requests
This adds a tracepoint that can both observe the nbd request being sent
to the server, as well as modify that request , e.g., setting a flag in
the request that will cause the server to collect detailed tracing data.
The struct request * being handled is included to permit correlation
with the block tracepoints.
Signed-off-by: Matt Mullins <mmullins@fb.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/nbd.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index 92b8aafb8bb4..24cc10d1f0b4 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -44,6 +44,9 @@ #include <linux/nbd-netlink.h> #include <net/genetlink.h> +#define CREATE_TRACE_POINTS +#include <trace/events/nbd.h> + static DEFINE_IDR(nbd_index_idr); static DEFINE_MUTEX(nbd_index_mutex); static int nbd_total_devices = 0; @@ -526,6 +529,8 @@ static int nbd_send_cmd(struct nbd_device *nbd, struct nbd_cmd *cmd, int index) handle = nbd_cmd_handle(cmd); memcpy(request.handle, &handle, sizeof(handle)); + trace_nbd_send_request(&request, nbd->index, blk_mq_rq_from_pdu(cmd)); + dev_dbg(nbd_to_dev(nbd), "request %p: sending control (%s@%llu,%uB)\n", req, nbdcmd_to_ascii(type), (unsigned long long)blk_rq_pos(req) << 9, blk_rq_bytes(req)); |