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With the rework of how the __string() handles dynamic strings where it
saves off the source string in field in the helper structure[1], the
assignment of that value to the trace event field is stored in the helper
value and does not need to be passed in again.
This means that with:
__string(field, mystring)
Which use to be assigned with __assign_str(field, mystring), no longer
needs the second parameter and it is unused. With this, __assign_str()
will now only get a single parameter.
There's over 700 users of __assign_str() and because coccinelle does not
handle the TRACE_EVENT() macro I ended up using the following sed script:
git grep -l __assign_str | while read a ; do
sed -e 's/\(__assign_str([^,]*[^ ,]\) *,[^;]*/\1)/' $a > /tmp/test-file;
mv /tmp/test-file $a;
done
I then searched for __assign_str() that did not end with ';' as those
were multi line assignments that the sed script above would fail to catch.
Note, the same updates will need to be done for:
__assign_str_len()
__assign_rel_str()
__assign_rel_str_len()
I tested this with both an allmodconfig and an allyesconfig (build only for both).
[1] https://lore.kernel.org/linux-trace-kernel/20240222211442.634192653@goodmis.org/
Link: https://lore.kernel.org/linux-trace-kernel/20240516133454.681ba6a0@rorschach.local.home
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Julia Lawall <Julia.Lawall@inria.fr>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Christian König <christian.koenig@amd.com> for the amdgpu parts.
Acked-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> #for
Acked-by: Rafael J. Wysocki <rafael@kernel.org> # for thermal
Acked-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Darrick J. Wong <djwong@kernel.org> # xfs
Tested-by: Guenter Roeck <linux@roeck-us.net>
|
||
|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| README | ||
| rnbd-clt-sysfs.c | ||
| rnbd-clt.c | ||
| rnbd-clt.h | ||
| rnbd-log.h | ||
| rnbd-proto.h | ||
| rnbd-srv-sysfs.c | ||
| rnbd-srv-trace.c | ||
| rnbd-srv-trace.h | ||
| rnbd-srv.c | ||
| rnbd-srv.h | ||
********************************
RDMA Network Block Device (RNBD)
********************************
Introduction
------------
RNBD (RDMA Network Block Device) is a pair of kernel modules
(client and server) that allow for remote access of a block device on
the server over RTRS protocol using the RDMA (InfiniBand, RoCE, iWARP)
transport. After being mapped, the remote block devices can be accessed
on the client side as local block devices.
I/O is transferred between client and server by the RTRS transport
modules. The administration of RNBD and RTRS modules is done via
sysfs entries.
Requirements
------------
RTRS kernel modules
Quick Start
-----------
Server side:
# modprobe rnbd_server
Client side:
# modprobe rnbd_client
# echo "sessname=blya path=ip:10.50.100.66 device_path=/dev/ram0" > \
/sys/devices/virtual/rnbd-client/ctl/map_device
Where "sessname=" is a session name, a string to identify the session
on client and on server sides; "path=" is a destination IP address or
a pair of a source and a destination IPs, separated by comma. Multiple
"path=" options can be specified in order to use multipath (see RTRS
description for details); "device_path=" is the block device to be
mapped from the server side. After the session to the server machine is
established, the mapped device will appear on the client side under
/dev/rnbd<N>.
RNBD-Server Module Parameters
=============================
dev_search_path
---------------
When a device is mapped from the client, the server generates the path
to the block device on the server side by concatenating dev_search_path
and the "device_path" that was specified in the map_device operation.
The default dev_search_path is: "/".
dev_search_path option can also contain %SESSNAME% in order to provide
different device namespaces for different sessions. See "device_path"
option for details.
============================
Protocol (rnbd/rnbd-proto.h)
============================
1. Before mapping first device from a given server, client sends an
RNBD_MSG_SESS_INFO to the server. Server responds with
RNBD_MSG_SESS_INFO_RSP. Currently the messages only contain the protocol
version for backward compatibility.
2. Client requests to open a device by sending RNBD_MSG_OPEN message. This
contains the path to the device and access mode (read-only or writable).
Server responds to the message with RNBD_MSG_OPEN_RSP. This contains
a 32 bit device id to be used for IOs and device "geometry" related
information: side, max_hw_sectors, etc.
3. Client attaches RNBD_MSG_IO to each IO message send to a device. This
message contains device id, provided by server in his rnbd_msg_open_rsp,
sector to be accessed, read-write flags and bi_size.
4. Client closes a device by sending RNBD_MSG_CLOSE which contains only the
device id provided by the server.
=========================================
Contributors List(in alphabetical order)
=========================================
Danil Kipnis <danil.kipnis@profitbricks.com>
Fabian Holler <mail@fholler.de>
Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Jack Wang <jinpu.wang@profitbricks.com>
Kleber Souza <kleber.souza@profitbricks.com>
Lutz Pogrell <lutz.pogrell@cloud.ionos.com>
Milind Dumbare <Milind.dumbare@gmail.com>
Roman Penyaev <roman.penyaev@profitbricks.com>
Swapnil Ingle <ingleswapnil@gmail.com>