From bc591ccff27e6a85d3a0d6fcb16cfadcc45267a8 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Mon, 2 Oct 2006 02:17:44 -0700 Subject: [PATCH] [PATCH] knfsd: add a callback for when last rpc thread finishes nfsd has some cleanup that it wants to do when the last thread exits, and there will shortly be some more. So collect this all into one place and define a callback for an rpc service to call when the service is about to be destroyed. [akpm@osdl.org: cleanups, build fix] Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/lockd/svc.c | 2 +- fs/nfs/callback.c | 2 +- fs/nfsd/nfssvc.c | 40 +++++++++++++++++--------------------- include/linux/sunrpc/svc.h | 8 +++++++- net/sunrpc/svc.c | 7 ++++++- 5 files changed, 33 insertions(+), 26 deletions(-) diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c index 9a991b52c6..13feba4503 100644 --- a/fs/lockd/svc.c +++ b/fs/lockd/svc.c @@ -236,7 +236,7 @@ lockd_up(void) "lockd_up: no pid, %d users??\n", nlmsvc_users); error = -ENOMEM; - serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE); + serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, NULL); if (!serv) { printk(KERN_WARNING "lockd_up: create service failed\n"); goto out; diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c index a3ee11364d..e244cdc7af 100644 --- a/fs/nfs/callback.c +++ b/fs/nfs/callback.c @@ -116,7 +116,7 @@ int nfs_callback_up(void) goto out; init_completion(&nfs_callback_info.started); init_completion(&nfs_callback_info.stopped); - serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE); + serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, NULL); ret = -ENOMEM; if (!serv) goto out_err; diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c index ec1decf29b..c52c99964a 100644 --- a/fs/nfsd/nfssvc.c +++ b/fs/nfsd/nfssvc.c @@ -130,11 +130,25 @@ int nfsd_nrthreads(void) return nfsd_serv->sv_nrthreads; } +static int killsig; /* signal that was used to kill last nfsd */ +static void nfsd_last_thread(struct svc_serv *serv) +{ + /* When last nfsd thread exits we need to do some clean-up */ + nfsd_serv = NULL; + nfsd_racache_shutdown(); + nfs4_state_shutdown(); + + printk(KERN_WARNING "nfsd: last server has exited\n"); + if (killsig != SIG_NOCLEAN) { + printk(KERN_WARNING "nfsd: unexporting all filesystems\n"); + nfsd_export_flush(); + } +} int nfsd_svc(unsigned short port, int nrservs) { int error; - int none_left, found_one, i; + int found_one, i; struct list_head *victim; lock_kernel(); @@ -197,7 +211,8 @@ nfsd_svc(unsigned short port, int nrservs) atomic_set(&nfsd_busy, 0); error = -ENOMEM; - nfsd_serv = svc_create(&nfsd_program, NFSD_BUFSIZE); + nfsd_serv = svc_create(&nfsd_program, NFSD_BUFSIZE, + nfsd_last_thread); if (nfsd_serv == NULL) goto out; error = svc_makesock(nfsd_serv, IPPROTO_UDP, port); @@ -231,13 +246,7 @@ nfsd_svc(unsigned short port, int nrservs) nrservs++; } failure: - none_left = (nfsd_serv->sv_nrthreads == 1); svc_destroy(nfsd_serv); /* Release server */ - if (none_left) { - nfsd_serv = NULL; - nfsd_racache_shutdown(); - nfs4_state_shutdown(); - } out: unlock_kernel(); return error; @@ -353,7 +362,7 @@ nfsd(struct svc_rqst *rqstp) if (sigismember(¤t->pending.signal, signo) && !sigismember(¤t->blocked, signo)) break; - err = signo; + killsig = signo; } /* Clear signals before calling lockd_down() and svc_exit_thread() */ flush_signals(current); @@ -362,19 +371,6 @@ nfsd(struct svc_rqst *rqstp) /* Release lockd */ lockd_down(); - - /* Check if this is last thread */ - if (serv->sv_nrthreads==1) { - - printk(KERN_WARNING "nfsd: last server has exited\n"); - if (err != SIG_NOCLEAN) { - printk(KERN_WARNING "nfsd: unexporting all filesystems\n"); - nfsd_export_flush(); - } - nfsd_serv = NULL; - nfsd_racache_shutdown(); /* release read-ahead cache */ - nfs4_state_shutdown(); - } list_del(&me.list); nfsdstats.th_cnt --; diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h index 73140ee5c6..bff5e9b486 100644 --- a/include/linux/sunrpc/svc.h +++ b/include/linux/sunrpc/svc.h @@ -42,6 +42,11 @@ struct svc_serv { int sv_tmpcnt; /* count of temporary sockets */ char * sv_name; /* service name */ + + void (*sv_shutdown)(struct svc_serv *serv); + /* Callback to use when last thread + * exits. + */ }; /* @@ -328,7 +333,8 @@ typedef void (*svc_thread_fn)(struct svc_rqst *); /* * Function prototypes. */ -struct svc_serv * svc_create(struct svc_program *, unsigned int); +struct svc_serv * svc_create(struct svc_program *, unsigned int, + void (*shutdown)(struct svc_serv*)); int svc_create_thread(svc_thread_fn, struct svc_serv *); void svc_exit_thread(struct svc_rqst *); void svc_destroy(struct svc_serv *); diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c index 44b8d9d4c1..f5aee4c616 100644 --- a/net/sunrpc/svc.c +++ b/net/sunrpc/svc.c @@ -26,7 +26,8 @@ * Create an RPC service */ struct svc_serv * -svc_create(struct svc_program *prog, unsigned int bufsize) +svc_create(struct svc_program *prog, unsigned int bufsize, + void (*shutdown)(struct svc_serv *serv)) { struct svc_serv *serv; int vers; @@ -39,6 +40,7 @@ svc_create(struct svc_program *prog, unsigned int bufsize) serv->sv_nrthreads = 1; serv->sv_stats = prog->pg_stats; serv->sv_bufsz = bufsize? bufsize : 4096; + serv->sv_shutdown = shutdown; xdrsize = 0; while (prog) { prog->pg_lovers = prog->pg_nvers-1; @@ -91,6 +93,9 @@ svc_destroy(struct svc_serv *serv) sk_list); svc_delete_socket(svsk); } + if (serv->sv_shutdown) + serv->sv_shutdown(serv); + while (!list_empty(&serv->sv_permsocks)) { svsk = list_entry(serv->sv_permsocks.next, struct svc_sock, -- 2.39.5