Implement nfsd_nl_server_stats_get_dumpit() which exposes the NFS server statistics currently available via /proc/net/rpc/nfsd through the nfsd generic netlink family. The handler uses a dump operation to stream statistics across one or more netlink messages. The reply is divided into sections that are emitted in order: - scalar stats (reply cache, filehandle, IO, network, RPC), emitted once in the first message, then - per-version procedure counts (proc2/3/4-ops) and the NFSv4 per-operation counts (proc4ops-ops), using the per-netns vs_count arrays. cb->args[0] tracks the current section and cb->args[1] the entry index within it, so a section that does not fit in the current message is closed and resumed in the next one. This matters because the first dump message is allocated at NLMSG_GOODSIZE (a single page on most architectures) regardless of the client's receive buffer; packing every counter into one message would overflow it and fail the dump with -EMSGSIZE. Userspace merges the attributes from every message. This allows nfsstat to retrieve server statistics via netlink with a procfs fallback for older kernels.
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| @@ -225,6 +225,40 @@ enum { · 224 unmodified lines | |||
| 225 | NFSD_A_UNLOCK_EXPORT_MAX = (__NFSD_A_UNLOCK_EXPORT_MAX - 1) | 225 | NFSD_A_UNLOCK_EXPORT_MAX = (__NFSD_A_UNLOCK_EXPORT_MAX - 1) |
| 226 | }; | 226 | }; |
| 227 | 227 | ||
| 228 | enum { | ||
| 229 | NFSD_A_SERVER_PROC_ENTRY_OP = 1, | ||
| 230 | NFSD_A_SERVER_PROC_ENTRY_COUNT, | ||
| 231 | NFSD_A_SERVER_PROC_ENTRY_PAD, | ||
| 232 | |||
| 233 | __NFSD_A_SERVER_PROC_ENTRY_MAX, | ||
| 234 | NFSD_A_SERVER_PROC_ENTRY_MAX = (__NFSD_A_SERVER_PROC_ENTRY_MAX - 1) | ||
| 235 | }; | ||
| 236 | |||
| 237 | enum { | ||
| 238 | NFSD_A_SERVER_STATS_RC_HITS = 1, | ||
| 239 | NFSD_A_SERVER_STATS_RC_MISSES, | ||
| 240 | NFSD_A_SERVER_STATS_RC_NOCACHE, | ||
| 241 | NFSD_A_SERVER_STATS_PAD, | ||
| 242 | NFSD_A_SERVER_STATS_FH_STALE, | ||
| 243 | NFSD_A_SERVER_STATS_IO_READ, | ||
| 244 | NFSD_A_SERVER_STATS_IO_WRITE, | ||
| 245 | NFSD_A_SERVER_STATS_NETCNT, | ||
| 246 | NFSD_A_SERVER_STATS_NETUDPCNT, | ||
| 247 | NFSD_A_SERVER_STATS_NETTCPCNT, | ||
| 248 | NFSD_A_SERVER_STATS_NETTCPCONN, | ||
| 249 | NFSD_A_SERVER_STATS_RPCCNT, | ||
| 250 | NFSD_A_SERVER_STATS_RPCBADFMT, | ||
| 251 | NFSD_A_SERVER_STATS_RPCBADAUTH, | ||
| 252 | NFSD_A_SERVER_STATS_RPCBADCLNT, | ||
| 253 | NFSD_A_SERVER_STATS_PROC2_OPS, | ||
| 254 | NFSD_A_SERVER_STATS_PROC3_OPS, | ||
| 255 | NFSD_A_SERVER_STATS_PROC4_OPS, | ||
| 256 | NFSD_A_SERVER_STATS_PROC4OPS_OPS, | ||
| 257 | |||
| 258 | __NFSD_A_SERVER_STATS_MAX, | ||
| 259 | NFSD_A_SERVER_STATS_MAX = (__NFSD_A_SERVER_STATS_MAX - 1) | ||
| 260 | }; | ||
| 261 | |||
| 228 | enum { | 262 | enum { |
| 229 | NFSD_CMD_RPC_STATUS_GET = 1, | 263 | NFSD_CMD_RPC_STATUS_GET = 1, |
| 230 | NFSD_CMD_THREADS_SET, | 264 | NFSD_CMD_THREADS_SET, |
| @@ -244,6 +278,7 @@ enum { · 13 unmodified lines | |||
| 244 | NFSD_CMD_UNLOCK_IP, | 278 | NFSD_CMD_UNLOCK_IP, |
| 245 | NFSD_CMD_UNLOCK_FILESYSTEM, | 279 | NFSD_CMD_UNLOCK_FILESYSTEM, |
| 246 | NFSD_CMD_UNLOCK_EXPORT, | 280 | NFSD_CMD_UNLOCK_EXPORT, |
| 281 | NFSD_CMD_SERVER_STATS_GET, | ||
| 247 | 282 | ||
| 248 | __NFSD_CMD_MAX, | 283 | __NFSD_CMD_MAX, |
| 249 | NFSD_CMD_MAX = (__NFSD_CMD_MAX - 1) | 284 | NFSD_CMD_MAX = (__NFSD_CMD_MAX - 1) |