546 lines
16 KiB
C
546 lines
16 KiB
C
/*-
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* Copyright (c) 2009 Robert N. M. Watson
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* All rights reserved.
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*
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* This software was developed at the University of Cambridge Computer
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* Laboratory with support from a grant from Google, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/dtrace.h>
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#include <sys/dtrace_bsd.h>
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#include <nfs/nfsproto.h>
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/*
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* dtnfsclient is a DTrace provider that tracks the intent to perform RPCs
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* in the NFS client, as well as acess to and maintenance of the access and
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* attribute caches. This is not quite the same as RPCs, because NFS may
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* issue multiple RPC transactions in the event that authentication fails,
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* there's a jukebox error, or none at all if the access or attribute cache
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* hits. However, it cleanly represents the logical layer between RPC
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* transmission and vnode/vfs operations, providing access to state linking
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* the two.
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*/
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static int dtnfsclient_unload(void);
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static void dtnfsclient_getargdesc(void *, dtrace_id_t, void *,
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dtrace_argdesc_t *);
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static void dtnfsclient_provide(void *, dtrace_probedesc_t *);
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static void dtnfsclient_destroy(void *, dtrace_id_t, void *);
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static void dtnfsclient_enable(void *, dtrace_id_t, void *);
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static void dtnfsclient_disable(void *, dtrace_id_t, void *);
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static void dtnfsclient_load(void *);
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static dtrace_pattr_t dtnfsclient_attr = {
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{ DTRACE_STABILITY_STABLE, DTRACE_STABILITY_STABLE, DTRACE_CLASS_COMMON },
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{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
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{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
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{ DTRACE_STABILITY_STABLE, DTRACE_STABILITY_STABLE, DTRACE_CLASS_COMMON },
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{ DTRACE_STABILITY_STABLE, DTRACE_STABILITY_STABLE, DTRACE_CLASS_COMMON },
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};
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/*
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* Description of NFSv3 and (optional) NFSv2 probes for a procedure.
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*/
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struct dtnfsclient_rpc {
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char *nr_v3_name;
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char *nr_v2_name; /* Or NULL if none. */
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/*
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* IDs for the start and done cases, for both NFSv2 and NFSv3.
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*/
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uint32_t nr_v2_id_start, nr_v2_id_done;
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uint32_t nr_v3_id_start, nr_v3_id_done;
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};
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/*
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* This table is indexed by NFSv3 procedure number, but also used for NFSv2
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* procedure names.
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*/
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static struct dtnfsclient_rpc dtnfsclient_rpcs[NFS_NPROCS] = {
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{ "null", "null" },
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{ "getattr", "getattr" },
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{ "setattr", "setattr" },
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{ "lookup", "lookup" },
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{ "access" },
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{ "readlink", "readlink" },
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{ "read", "read" },
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{ "write", "write" },
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{ "create", "create" },
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{ "mkdir", "mkdir" },
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{ "symlink", "symlink" },
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{ "mknod" },
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{ "remove", "remove" },
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{ "rmdir", "rmdir" },
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{ "rename", "rename" },
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{ "link", "link" },
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{ "readdir", "readdir" },
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{ "readdirplus" },
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{ "fsstat", "statfs" },
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{ "fsinfo" },
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{ "pathconf" },
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{ "commit" },
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{ "noop" },
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};
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/*
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* Module name strings.
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*/
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static char *dtnfsclient_accesscache_str = "accesscache";
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static char *dtnfsclient_attrcache_str = "attrcache";
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static char *dtnfsclient_nfs2_str = "nfs2";
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static char *dtnfsclient_nfs3_str = "nfs3";
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/*
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* Function name strings.
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*/
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static char *dtnfsclient_flush_str = "flush";
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static char *dtnfsclient_load_str = "load";
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static char *dtnfsclient_get_str = "get";
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/*
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* Name strings.
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*/
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static char *dtnfsclient_done_str = "done";
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static char *dtnfsclient_hit_str = "hit";
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static char *dtnfsclient_miss_str = "miss";
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static char *dtnfsclient_start_str = "start";
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static dtrace_pops_t dtnfsclient_pops = {
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dtnfsclient_provide,
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NULL,
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dtnfsclient_enable,
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dtnfsclient_disable,
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NULL,
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NULL,
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dtnfsclient_getargdesc,
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NULL,
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NULL,
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dtnfsclient_destroy
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};
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static dtrace_provider_id_t dtnfsclient_id;
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/*
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* Most probes are generated from the above RPC table, but for access and
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* attribute caches, we have specific IDs we recognize and handle specially
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* in various spots.
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*/
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extern uint32_t nfsclient_accesscache_flush_done_id;
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extern uint32_t nfsclient_accesscache_get_hit_id;
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extern uint32_t nfsclient_accesscache_get_miss_id;
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extern uint32_t nfsclient_accesscache_load_done_id;
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extern uint32_t nfsclient_attrcache_flush_done_id;
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extern uint32_t nfsclient_attrcache_get_hit_id;
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extern uint32_t nfsclient_attrcache_get_miss_id;
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extern uint32_t nfsclient_attrcache_load_done_id;
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/*
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* When tracing on a procedure is enabled, the DTrace ID for an RPC event is
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* stored in one of these two NFS client-allocated arrays; 0 indicates that
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* the event is not being traced so probes should not be called.
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*
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* For simplicity, we allocate both v2 and v3 arrays as NFS_NPROCS, and the
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* v2 array is simply sparse.
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*/
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extern uint32_t nfsclient_nfs2_start_probes[NFS_NPROCS];
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extern uint32_t nfsclient_nfs2_done_probes[NFS_NPROCS];
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extern uint32_t nfsclient_nfs3_start_probes[NFS_NPROCS];
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extern uint32_t nfsclient_nfs3_done_probes[NFS_NPROCS];
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/*
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* Look up a DTrace probe ID to see if it's associated with a "done" event --
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* if so, we will return a fourth argument type of "int".
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*/
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static int
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dtnfs23_isdoneprobe(dtrace_id_t id)
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{
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int i;
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for (i = 0; i < NFS_NPROCS; i++) {
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if (dtnfsclient_rpcs[i].nr_v3_id_done == id ||
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dtnfsclient_rpcs[i].nr_v2_id_done == id)
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return (1);
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}
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return (0);
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}
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static void
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dtnfsclient_getargdesc(void *arg, dtrace_id_t id, void *parg,
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dtrace_argdesc_t *desc)
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{
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const char *p = NULL;
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if (id == nfsclient_accesscache_flush_done_id ||
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id == nfsclient_attrcache_flush_done_id ||
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id == nfsclient_attrcache_get_miss_id) {
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switch (desc->dtargd_ndx) {
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case 0:
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p = "struct vnode *";
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break;
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default:
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desc->dtargd_ndx = DTRACE_ARGNONE;
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break;
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}
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} else if (id == nfsclient_accesscache_get_hit_id ||
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id == nfsclient_accesscache_get_miss_id) {
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switch (desc->dtargd_ndx) {
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case 0:
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p = "struct vnode *";
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break;
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case 1:
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p = "uid_t";
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break;
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case 2:
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p = "uint32_t";
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break;
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default:
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desc->dtargd_ndx = DTRACE_ARGNONE;
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break;
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}
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} else if (id == nfsclient_accesscache_load_done_id) {
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switch (desc->dtargd_ndx) {
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case 0:
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p = "struct vnode *";
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break;
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case 1:
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p = "uid_t";
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break;
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case 2:
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p = "uint32_t";
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break;
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case 3:
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p = "int";
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break;
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default:
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desc->dtargd_ndx = DTRACE_ARGNONE;
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break;
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}
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} else if (id == nfsclient_attrcache_get_hit_id) {
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switch (desc->dtargd_ndx) {
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case 0:
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p = "struct vnode *";
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break;
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case 1:
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p = "struct vattr *";
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break;
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default:
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desc->dtargd_ndx = DTRACE_ARGNONE;
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break;
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}
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} else if (id == nfsclient_attrcache_load_done_id) {
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switch (desc->dtargd_ndx) {
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case 0:
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p = "struct vnode *";
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break;
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case 1:
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p = "struct vattr *";
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break;
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case 2:
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p = "int";
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break;
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default:
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desc->dtargd_ndx = DTRACE_ARGNONE;
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break;
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}
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} else {
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switch (desc->dtargd_ndx) {
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case 0:
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p = "struct vnode *";
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break;
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case 1:
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p = "struct mbuf *";
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break;
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case 2:
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p = "struct ucred *";
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break;
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case 3:
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p = "int";
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break;
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case 4:
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if (dtnfs23_isdoneprobe(id)) {
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p = "int";
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break;
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}
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/* FALLSTHROUGH */
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default:
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desc->dtargd_ndx = DTRACE_ARGNONE;
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break;
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}
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}
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if (p != NULL)
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strlcpy(desc->dtargd_native, p, sizeof(desc->dtargd_native));
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}
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static void
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dtnfsclient_provide(void *arg, dtrace_probedesc_t *desc)
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{
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int i;
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if (desc != NULL)
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return;
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/*
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* Register access cache probes.
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*/
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if (dtrace_probe_lookup(dtnfsclient_id, dtnfsclient_accesscache_str,
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dtnfsclient_flush_str, dtnfsclient_done_str) == 0) {
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nfsclient_accesscache_flush_done_id = dtrace_probe_create(
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dtnfsclient_id, dtnfsclient_accesscache_str,
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dtnfsclient_flush_str, dtnfsclient_done_str, 0, NULL);
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}
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if (dtrace_probe_lookup(dtnfsclient_id, dtnfsclient_accesscache_str,
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dtnfsclient_get_str, dtnfsclient_hit_str) == 0) {
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nfsclient_accesscache_get_hit_id = dtrace_probe_create(
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dtnfsclient_id, dtnfsclient_accesscache_str,
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dtnfsclient_get_str, dtnfsclient_hit_str, 0, NULL);
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}
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if (dtrace_probe_lookup(dtnfsclient_id, dtnfsclient_accesscache_str,
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dtnfsclient_get_str, dtnfsclient_miss_str) == 0) {
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nfsclient_accesscache_get_miss_id = dtrace_probe_create(
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dtnfsclient_id, dtnfsclient_accesscache_str,
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dtnfsclient_get_str, dtnfsclient_miss_str, 0, NULL);
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}
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if (dtrace_probe_lookup(dtnfsclient_id, dtnfsclient_accesscache_str,
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dtnfsclient_load_str, dtnfsclient_done_str) == 0) {
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nfsclient_accesscache_load_done_id = dtrace_probe_create(
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dtnfsclient_id, dtnfsclient_accesscache_str,
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dtnfsclient_load_str, dtnfsclient_done_str, 0, NULL);
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}
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/*
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* Register attribute cache probes.
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*/
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if (dtrace_probe_lookup(dtnfsclient_id, dtnfsclient_attrcache_str,
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dtnfsclient_flush_str, dtnfsclient_done_str) == 0) {
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nfsclient_attrcache_flush_done_id = dtrace_probe_create(
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dtnfsclient_id, dtnfsclient_attrcache_str,
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dtnfsclient_flush_str, dtnfsclient_done_str, 0, NULL);
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}
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if (dtrace_probe_lookup(dtnfsclient_id, dtnfsclient_attrcache_str,
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dtnfsclient_get_str, dtnfsclient_hit_str) == 0) {
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nfsclient_attrcache_get_hit_id = dtrace_probe_create(
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dtnfsclient_id, dtnfsclient_attrcache_str,
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dtnfsclient_get_str, dtnfsclient_hit_str, 0, NULL);
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}
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if (dtrace_probe_lookup(dtnfsclient_id, dtnfsclient_attrcache_str,
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dtnfsclient_get_str, dtnfsclient_miss_str) == 0) {
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nfsclient_attrcache_get_miss_id = dtrace_probe_create(
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dtnfsclient_id, dtnfsclient_attrcache_str,
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dtnfsclient_get_str, dtnfsclient_miss_str, 0, NULL);
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}
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if (dtrace_probe_lookup(dtnfsclient_id, dtnfsclient_attrcache_str,
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dtnfsclient_load_str, dtnfsclient_done_str) == 0) {
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nfsclient_attrcache_load_done_id = dtrace_probe_create(
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dtnfsclient_id, dtnfsclient_attrcache_str,
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dtnfsclient_load_str, dtnfsclient_done_str, 0, NULL);
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}
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/*
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* Register NFSv2 RPC procedures; note sparseness check for each slot
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* in the NFSv3 procnum-indexed array.
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*/
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for (i = 0; i < NFS_NPROCS; i++) {
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if (dtnfsclient_rpcs[i].nr_v2_name != NULL &&
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dtrace_probe_lookup(dtnfsclient_id, dtnfsclient_nfs2_str,
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dtnfsclient_rpcs[i].nr_v2_name, dtnfsclient_start_str) ==
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0) {
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dtnfsclient_rpcs[i].nr_v2_id_start =
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dtrace_probe_create(dtnfsclient_id,
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dtnfsclient_nfs2_str,
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dtnfsclient_rpcs[i].nr_v2_name,
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dtnfsclient_start_str, 0,
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&nfsclient_nfs2_start_probes[i]);
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}
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if (dtnfsclient_rpcs[i].nr_v2_name != NULL &&
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dtrace_probe_lookup(dtnfsclient_id, dtnfsclient_nfs2_str,
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dtnfsclient_rpcs[i].nr_v2_name, dtnfsclient_done_str) ==
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0) {
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dtnfsclient_rpcs[i].nr_v2_id_done =
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dtrace_probe_create(dtnfsclient_id,
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dtnfsclient_nfs2_str,
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dtnfsclient_rpcs[i].nr_v2_name,
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dtnfsclient_done_str, 0,
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&nfsclient_nfs2_done_probes[i]);
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}
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}
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/*
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* Register NFSv3 RPC procedures.
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*/
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for (i = 0; i < NFS_NPROCS; i++) {
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if (dtrace_probe_lookup(dtnfsclient_id, dtnfsclient_nfs3_str,
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dtnfsclient_rpcs[i].nr_v3_name, dtnfsclient_start_str) ==
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0) {
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dtnfsclient_rpcs[i].nr_v3_id_start =
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dtrace_probe_create(dtnfsclient_id,
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dtnfsclient_nfs3_str,
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dtnfsclient_rpcs[i].nr_v3_name,
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dtnfsclient_start_str, 0,
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&nfsclient_nfs3_start_probes[i]);
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}
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if (dtrace_probe_lookup(dtnfsclient_id, dtnfsclient_nfs3_str,
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dtnfsclient_rpcs[i].nr_v3_name, dtnfsclient_done_str) ==
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0) {
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dtnfsclient_rpcs[i].nr_v3_id_done =
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dtrace_probe_create(dtnfsclient_id,
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dtnfsclient_nfs3_str,
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dtnfsclient_rpcs[i].nr_v3_name,
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dtnfsclient_done_str, 0,
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&nfsclient_nfs3_done_probes[i]);
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}
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}
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}
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static void
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dtnfsclient_destroy(void *arg, dtrace_id_t id, void *parg)
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{
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}
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static void
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dtnfsclient_enable(void *arg, dtrace_id_t id, void *parg)
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{
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uint32_t *p = parg;
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void *f = dtrace_probe;
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if (id == nfsclient_accesscache_flush_done_id)
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dtrace_nfsclient_accesscache_flush_done_probe = f;
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else if (id == nfsclient_accesscache_get_hit_id)
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dtrace_nfsclient_accesscache_get_hit_probe = f;
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else if (id == nfsclient_accesscache_get_miss_id)
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dtrace_nfsclient_accesscache_get_miss_probe = f;
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else if (id == nfsclient_accesscache_load_done_id)
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dtrace_nfsclient_accesscache_load_done_probe = f;
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else if (id == nfsclient_attrcache_flush_done_id)
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dtrace_nfsclient_attrcache_flush_done_probe = f;
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else if (id == nfsclient_attrcache_get_hit_id)
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dtrace_nfsclient_attrcache_get_hit_probe = f;
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else if (id == nfsclient_attrcache_get_miss_id)
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dtrace_nfsclient_attrcache_get_miss_probe = f;
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else if (id == nfsclient_attrcache_load_done_id)
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dtrace_nfsclient_attrcache_load_done_probe = f;
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else
|
|
*p = id;
|
|
}
|
|
|
|
static void
|
|
dtnfsclient_disable(void *arg, dtrace_id_t id, void *parg)
|
|
{
|
|
uint32_t *p = parg;
|
|
|
|
if (id == nfsclient_accesscache_flush_done_id)
|
|
dtrace_nfsclient_accesscache_flush_done_probe = NULL;
|
|
else if (id == nfsclient_accesscache_get_hit_id)
|
|
dtrace_nfsclient_accesscache_get_hit_probe = NULL;
|
|
else if (id == nfsclient_accesscache_get_miss_id)
|
|
dtrace_nfsclient_accesscache_get_miss_probe = NULL;
|
|
else if (id == nfsclient_accesscache_load_done_id)
|
|
dtrace_nfsclient_accesscache_load_done_probe = NULL;
|
|
else if (id == nfsclient_attrcache_flush_done_id)
|
|
dtrace_nfsclient_attrcache_flush_done_probe = NULL;
|
|
else if (id == nfsclient_attrcache_get_hit_id)
|
|
dtrace_nfsclient_attrcache_get_hit_probe = NULL;
|
|
else if (id == nfsclient_attrcache_get_miss_id)
|
|
dtrace_nfsclient_attrcache_get_miss_probe = NULL;
|
|
else if (id == nfsclient_attrcache_load_done_id)
|
|
dtrace_nfsclient_attrcache_load_done_probe = NULL;
|
|
else
|
|
*p = 0;
|
|
}
|
|
|
|
static void
|
|
dtnfsclient_load(void *dummy)
|
|
{
|
|
|
|
if (dtrace_register("nfsclient", &dtnfsclient_attr,
|
|
DTRACE_PRIV_USER, NULL, &dtnfsclient_pops, NULL,
|
|
&dtnfsclient_id) != 0)
|
|
return;
|
|
|
|
dtrace_nfsclient_nfs23_start_probe =
|
|
(dtrace_nfsclient_nfs23_start_probe_func_t)dtrace_probe;
|
|
dtrace_nfsclient_nfs23_done_probe =
|
|
(dtrace_nfsclient_nfs23_done_probe_func_t)dtrace_probe;
|
|
}
|
|
|
|
|
|
static int
|
|
dtnfsclient_unload()
|
|
{
|
|
int error = 0;
|
|
|
|
dtrace_nfsclient_nfs23_start_probe = NULL;
|
|
dtrace_nfsclient_nfs23_done_probe = NULL;
|
|
|
|
if ((error = dtrace_unregister(dtnfsclient_id)) != 0)
|
|
return (error);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
dtnfsclient_modevent(module_t mod __unused, int type, void *data __unused)
|
|
{
|
|
int error = 0;
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
break;
|
|
|
|
case MOD_UNLOAD:
|
|
break;
|
|
|
|
case MOD_SHUTDOWN:
|
|
break;
|
|
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
SYSINIT(dtnfsclient_load, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY,
|
|
dtnfsclient_load, NULL);
|
|
SYSUNINIT(dtnfsclient_unload, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY,
|
|
dtnfsclient_unload, NULL);
|
|
|
|
DEV_MODULE(dtnfsclient, dtnfsclient_modevent, NULL);
|
|
MODULE_VERSION(dtnfsclient, 1);
|
|
MODULE_DEPEND(dtnfsclient, dtrace, 1, 1, 1);
|
|
MODULE_DEPEND(dtnfsclient, opensolaris, 1, 1, 1);
|