From: Olga Kornievskaia <kolga@xxxxxxxxxx> This is the same patch series that was introduced by Anna Schumaker and slightly redone with also including some elements of the proposed additions by Dan Alohi. The main motivation behind is a situation where an NFS server goes down and then comes back up with a different IP. These patches provide a way for administrators to handle this issue by providing a new IP address for one ore more existing transports to connect to. Sysfs structure has changed slightly. Everything is still off the /sys/kernel/sunrpc which has 2 main subdirectories "rpc-clients" and "xprt-switches". "xprt-switches" contain one or more subdirectories "switch-<uniqueid>" that represent a group of transports created for a given NFS server. Under this directory is one or more directories named "xprt-<uniqueid>-type" where type is "udp, tcp, rdma, local". Under each transport directory are 2 files. "dstaddr" which can be queried to see what's this transport is connected to and "dstaddr" can be changed by providing a new IP for the server. The setting of the new address is allowed only for "tcp" and "rdma" transport types. There is also "xprt_info" file which contains a list of possibly useful information about the transport: xprt state, last time use, etc (for the full list see an individual commit). At the "switch-<uniqueid>" directory there is also "xprt_switch_info" which contains the info about number of transports and active transports and xprt_switch's queue len. Going back to the "rpc-clients" directory, it contains a subdirectory for each rpc client "clnt-<uniqueid>" and inside is a symlink to the xprt_switch directory this rpc client is using. Some of Anna's and Dan's patches were slightly modified to satisfy checkpatch script. v2: fixed kernel test robot issues. Anna Schumaker (1): sunrpc: Prepare xs_connect() for taking NULL tasks Dan Aloni (1): sunrpc: add xprt id Olga Kornievskaia (11): sunrpc: Create a sunrpc directory under /sys/kernel/ sunrpc: Create a client/ subdirectory in the sunrpc sysfs sunrpc: Create per-rpc_clnt sysfs kobjects sunrpc: add IDs to multipath sunrpc: keep track of the xprt_class in rpc_xprt structure sunrpc: add xprt_switch direcotry to sunrpc's sysfs sunrpc: add a symlink from rpc-client directory to the xprt_switch sunrpc: add add sysfs directory per xprt under each xprt_switch sunrpc: add dst_attr attributes to the sysfs xprt directory sunrpc: provide transport info in the sysfs directory sunrpc: provide multipath info in the sysfs directory include/linux/sunrpc/clnt.h | 1 + include/linux/sunrpc/xprt.h | 5 + include/linux/sunrpc/xprtmultipath.h | 5 + net/sunrpc/Makefile | 2 +- net/sunrpc/clnt.c | 5 + net/sunrpc/sunrpc_syms.c | 10 + net/sunrpc/sysfs.c | 476 +++++++++++++++++++++++++++ net/sunrpc/sysfs.h | 42 +++ net/sunrpc/xprt.c | 26 ++ net/sunrpc/xprtmultipath.c | 32 ++ net/sunrpc/xprtrdma/transport.c | 2 + net/sunrpc/xprtsock.c | 11 +- 12 files changed, 615 insertions(+), 2 deletions(-) create mode 100644 net/sunrpc/sysfs.c create mode 100644 net/sunrpc/sysfs.h -- 2.27.0
