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. Not included before is a sample output for the nconnect=2 mount: ls /sys/kernel/sunrpc/xprt-switches/ switch-0 [root@localhost aglo]# ls /sys/kernel/sunrpc/xprt-switches/switch-0/ xprt-0-tcp xprt-1-tcp xprt_switch_info [root@localhost aglo]# ls /sys/kernel/sunrpc/xprt-switches/switch-0/xprt-0-tcp/ dstaddr xprt_info [root@localhost aglo]# cat /sys/kernel/sunrpc/xprt-switches/switch-0/xprt-0-tcp/dstaddr 192.168.1.68 [root@localhost aglo]# cat /sys/kernel/sunrpc/xprt-switches/switch-0/xprt-0-tcp/xprt_info state= CONNECTED BOUND last_used=4294830258 cur_cong=0 cong_win=256 max_num_slots=65536 min_num_slots=2 num_reqs=2 binding_q_len=0 sending_q_len=0 pending_q_len=0 backlog_q_len=0 [root@localhost aglo]# cat /sys/kernel/sunrpc/xprt-switches/switch-0/xprt xprt-0-tcp/ xprt-1-tcp/ xprt_switch_info [root@localhost aglo]# cat /sys/kernel/sunrpc/xprt-switches/switch-0/xprt_switch_info num_xprts=2 num_active=2 queue_len=0 [root@localhost aglo]# ls /sys/kernel/sunrpc/rpc-clients/ clnt-0 clnt-1 [root@localhost aglo]# ls /sys/kernel/sunrpc/rpc-clients/clnt-0 switch-0 [root@localhost aglo]# ls /sys/kernel/sunrpc/rpc-clients/clnt-1 switch-0 v3: --addressed the memory allocations. Patches 6,8,10 were modified to pass in gfp_t flags into the functions. -- To address the allocation with the locked environment problem the call to rpc_sysfs_xprt_switch_xprt_setup() was removed from the xprt_switch_add_xprt_locked() and called after but also I bumped the refcount on xprt_switch and xprt structures being used. -- changed patch13 to remove rcu_dereference() use in rpc_sysfs_xprt_switch_kobj_get_xprt() because it's not an "__rcu" field. Anna Schumaker (4): sunrpc: Prepare xs_connect() for taking NULL tasks sunrpc: Create a sunrpc directory under /sys/kernel/ sunrpc: Create a client/ subdirectory in the sunrpc sysfs sunrpc: Create per-rpc_clnt sysfs kobjects Dan Aloni (2): sunrpc: add xprt id sunrpc: add IDs to multipath Olga Kornievskaia (7): 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 | 481 +++++++++++++++++++++++++++ net/sunrpc/sysfs.h | 42 +++ net/sunrpc/xprt.c | 26 ++ net/sunrpc/xprtmultipath.c | 40 +++ net/sunrpc/xprtrdma/transport.c | 2 + net/sunrpc/xprtsock.c | 11 +- 12 files changed, 628 insertions(+), 2 deletions(-) create mode 100644 net/sunrpc/sysfs.c create mode 100644 net/sunrpc/sysfs.h -- 2.27.0
