X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=fs%2Fnfsd%2Fnfssvc.c;h=fbf5d51947ea3e252185457e33cc163dbf30d660;hb=refs%2Fheads%2Fvserver;hp=1d163b6169151ce870c911dc1c7eb0eb40c80a74;hpb=76828883507a47dae78837ab5dec5a5b4513c667;p=linux-2.6.git diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c index 1d163b616..fbf5d5194 100644 --- a/fs/nfsd/nfssvc.c +++ b/fs/nfsd/nfssvc.c @@ -8,7 +8,6 @@ * Copyright (C) 1995, 1996, 1997 Olaf Kirch */ -#include #include #include @@ -58,12 +57,6 @@ static atomic_t nfsd_busy; static unsigned long nfsd_last_call; static DEFINE_SPINLOCK(nfsd_call_lock); -struct nfsd_list { - struct list_head list; - struct task_struct *task; -}; -static struct list_head nfsd_list = LIST_HEAD_INIT(nfsd_list); - #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) static struct svc_stat nfsd_acl_svcstats; static struct svc_version * nfsd_acl_version[] = { @@ -72,14 +65,14 @@ static struct svc_version * nfsd_acl_version[] = { }; #define NFSD_ACL_MINVERS 2 -#define NFSD_ACL_NRVERS (sizeof(nfsd_acl_version)/sizeof(nfsd_acl_version[0])) +#define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS]; static struct svc_program nfsd_acl_program = { .pg_prog = NFS_ACL_PROGRAM, .pg_nvers = NFSD_ACL_NRVERS, .pg_vers = nfsd_acl_versions, - .pg_name = "nfsd", + .pg_name = "nfsacl", .pg_class = "nfsd", .pg_stats = &nfsd_acl_svcstats, .pg_authenticate = &svc_set_client, @@ -101,7 +94,7 @@ static struct svc_version * nfsd_version[] = { }; #define NFSD_MINVERS 2 -#define NFSD_NRVERS (sizeof(nfsd_version)/sizeof(nfsd_version[0])) +#define NFSD_NRVERS ARRAY_SIZE(nfsd_version) static struct svc_version *nfsd_versions[NFSD_NRVERS]; struct svc_program nfsd_program = { @@ -118,6 +111,32 @@ struct svc_program nfsd_program = { }; +int nfsd_vers(int vers, enum vers_op change) +{ + if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) + return -1; + switch(change) { + case NFSD_SET: + nfsd_versions[vers] = nfsd_version[vers]; +#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) + if (vers < NFSD_ACL_NRVERS) + nfsd_acl_versions[vers] = nfsd_acl_version[vers]; +#endif + break; + case NFSD_CLEAR: + nfsd_versions[vers] = NULL; +#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) + if (vers < NFSD_ACL_NRVERS) + nfsd_acl_versions[vers] = NULL; +#endif + break; + case NFSD_TEST: + return nfsd_versions[vers] != NULL; + case NFSD_AVAIL: + return nfsd_version[vers] != NULL; + } + return 0; +} /* * Maximum number of nfsd processes */ @@ -131,16 +150,192 @@ 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 */ + struct svc_sock *svsk; + list_for_each_entry(svsk, &serv->sv_permsocks, sk_list) + lockd_down(); + 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(); + } +} + +void nfsd_reset_versions(void) +{ + int found_one = 0; + int i; + + for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { + if (nfsd_program.pg_vers[i]) + found_one = 1; + } + + if (!found_one) { + for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) + nfsd_program.pg_vers[i] = nfsd_version[i]; +#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) + for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) + nfsd_acl_program.pg_vers[i] = + nfsd_acl_version[i]; +#endif + } +} + +int nfsd_create_serv(void) +{ + int err = 0; + lock_kernel(); + if (nfsd_serv) { + svc_get(nfsd_serv); + unlock_kernel(); + return 0; + } + if (nfsd_max_blksize == 0) { + /* choose a suitable default */ + struct sysinfo i; + si_meminfo(&i); + /* Aim for 1/4096 of memory per thread + * This gives 1MB on 4Gig machines + * But only uses 32K on 128M machines. + * Bottom out at 8K on 32M and smaller. + * Of course, this is only a default. + */ + nfsd_max_blksize = NFSSVC_MAXBLKSIZE; + i.totalram <<= PAGE_SHIFT - 12; + while (nfsd_max_blksize > i.totalram && + nfsd_max_blksize >= 8*1024*2) + nfsd_max_blksize /= 2; + } + + atomic_set(&nfsd_busy, 0); + nfsd_serv = svc_create_pooled(&nfsd_program, + nfsd_max_blksize, + nfsd_last_thread, + nfsd, SIG_NOCLEAN, THIS_MODULE); + if (nfsd_serv == NULL) + err = -ENOMEM; + unlock_kernel(); + do_gettimeofday(&nfssvc_boot); /* record boot time */ + return err; +} + +static int nfsd_init_socks(int port) +{ + int error; + if (!list_empty(&nfsd_serv->sv_permsocks)) + return 0; + + error = lockd_up(IPPROTO_UDP); + if (error >= 0) { + error = svc_makesock(nfsd_serv, IPPROTO_UDP, port); + if (error < 0) + lockd_down(); + } + if (error < 0) + return error; + +#ifdef CONFIG_NFSD_TCP + error = lockd_up(IPPROTO_TCP); + if (error >= 0) { + error = svc_makesock(nfsd_serv, IPPROTO_TCP, port); + if (error < 0) + lockd_down(); + } + if (error < 0) + return error; +#endif + return 0; +} + +int nfsd_nrpools(void) +{ + if (nfsd_serv == NULL) + return 0; + else + return nfsd_serv->sv_nrpools; +} + +int nfsd_get_nrthreads(int n, int *nthreads) +{ + int i = 0; + + if (nfsd_serv != NULL) { + for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++) + nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads; + } + + return 0; +} + +int nfsd_set_nrthreads(int n, int *nthreads) +{ + int i = 0; + int tot = 0; + int err = 0; + + if (nfsd_serv == NULL || n <= 0) + return 0; + + if (n > nfsd_serv->sv_nrpools) + n = nfsd_serv->sv_nrpools; + + /* enforce a global maximum number of threads */ + tot = 0; + for (i = 0; i < n; i++) { + if (nthreads[i] > NFSD_MAXSERVS) + nthreads[i] = NFSD_MAXSERVS; + tot += nthreads[i]; + } + if (tot > NFSD_MAXSERVS) { + /* total too large: scale down requested numbers */ + for (i = 0; i < n && tot > 0; i++) { + int new = nthreads[i] * NFSD_MAXSERVS / tot; + tot -= (nthreads[i] - new); + nthreads[i] = new; + } + for (i = 0; i < n && tot > 0; i++) { + nthreads[i]--; + tot--; + } + } + + /* + * There must always be a thread in pool 0; the admin + * can't shut down NFS completely using pool_threads. + */ + if (nthreads[0] == 0) + nthreads[0] = 1; + + /* apply the new numbers */ + lock_kernel(); + svc_get(nfsd_serv); + for (i = 0; i < n; i++) { + err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i], + nthreads[i]); + if (err) + break; + } + svc_destroy(nfsd_serv); + unlock_kernel(); + + return err; +} + int nfsd_svc(unsigned short port, int nrservs) { int error; - int none_left, found_one, i; - struct list_head *victim; lock_kernel(); - dprintk("nfsd: creating service: vers 0x%x\n", - nfsd_versbits); + dprintk("nfsd: creating service\n"); error = -EINVAL; if (nrservs <= 0) nrservs = 0; @@ -154,91 +349,20 @@ nfsd_svc(unsigned short port, int nrservs) error = nfs4_state_start(); if (error<0) goto out; - if (!nfsd_serv) { - /* - * Use the nfsd_ctlbits to define which - * versions that will be advertised. - * If nfsd_ctlbits doesn't list any version, - * export them all. - */ - found_one = 0; - - for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { - if (NFSCTL_VERISSET(nfsd_versbits, i)) { - nfsd_program.pg_vers[i] = nfsd_version[i]; - found_one = 1; - } else - nfsd_program.pg_vers[i] = NULL; - } - if (!found_one) { - for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) - nfsd_program.pg_vers[i] = nfsd_version[i]; - } + nfsd_reset_versions(); + error = nfsd_create_serv(); -#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) - found_one = 0; - - for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) { - if (NFSCTL_VERISSET(nfsd_versbits, i)) { - nfsd_acl_program.pg_vers[i] = - nfsd_acl_version[i]; - found_one = 1; - } else - nfsd_acl_program.pg_vers[i] = NULL; - } - - if (!found_one) { - for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) - nfsd_acl_program.pg_vers[i] = - nfsd_acl_version[i]; - } -#endif - - atomic_set(&nfsd_busy, 0); - error = -ENOMEM; - nfsd_serv = svc_create(&nfsd_program, NFSD_BUFSIZE); - if (nfsd_serv == NULL) - goto out; - error = svc_makesock(nfsd_serv, IPPROTO_UDP, port); - if (error < 0) - goto failure; + if (error) + goto out; + error = nfsd_init_socks(port); + if (error) + goto failure; -#ifdef CONFIG_NFSD_TCP - error = svc_makesock(nfsd_serv, IPPROTO_TCP, port); - if (error < 0) - goto failure; -#endif - do_gettimeofday(&nfssvc_boot); /* record boot time */ - } else - nfsd_serv->sv_nrthreads++; - nrservs -= (nfsd_serv->sv_nrthreads-1); - while (nrservs > 0) { - nrservs--; - __module_get(THIS_MODULE); - error = svc_create_thread(nfsd, nfsd_serv); - if (error < 0) { - module_put(THIS_MODULE); - break; - } - } - victim = nfsd_list.next; - while (nrservs < 0 && victim != &nfsd_list) { - struct nfsd_list *nl = - list_entry(victim,struct nfsd_list, list); - victim = victim->next; - send_sig(SIG_NOCLEAN, nl->task, 1); - nrservs++; - } + error = svc_set_num_threads(nfsd_serv, NULL, 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; @@ -271,10 +395,8 @@ update_thread_usage(int busy_threads) static void nfsd(struct svc_rqst *rqstp) { - struct svc_serv *serv = rqstp->rq_server; struct fs_struct *fsp; int err; - struct nfsd_list me; sigset_t shutdown_mask, allowed_mask; /* Lock module and set up kernel thread */ @@ -298,10 +420,7 @@ nfsd(struct svc_rqst *rqstp) nfsdstats.th_cnt++; - lockd_up(); /* start lockd */ - - me.task = current; - list_add(&me.list, &nfsd_list); + rqstp->rq_task = current; unlock_kernel(); @@ -323,8 +442,7 @@ nfsd(struct svc_rqst *rqstp) * Find a socket with data available and call its * recvfrom routine. */ - while ((err = svc_recv(serv, rqstp, - 60*60*HZ)) == -EAGAIN) + while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) ; if (err < 0) break; @@ -337,7 +455,7 @@ nfsd(struct svc_rqst *rqstp) /* Process request with signals blocked. */ sigprocmask(SIG_SETMASK, &allowed_mask, NULL); - svc_process(serv, rqstp); + svc_process(rqstp); /* Unlock export hash tables */ exp_readunlock(); @@ -354,29 +472,13 @@ 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() */ + /* Clear signals before calling svc_exit_thread() */ flush_signals(current); lock_kernel(); - /* 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 --; out: @@ -389,12 +491,12 @@ out: } int -nfsd_dispatch(struct svc_rqst *rqstp, u32 *statp) +nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) { struct svc_procedure *proc; kxdrproc_t xdr; - u32 nfserr; - u32 *nfserrp; + __be32 nfserr; + __be32 *nfserrp; dprintk("nfsd_dispatch: vers %d proc %d\n", rqstp->rq_vers, rqstp->rq_proc); @@ -413,7 +515,7 @@ nfsd_dispatch(struct svc_rqst *rqstp, u32 *statp) /* Decode arguments */ xdr = proc->pc_decode; - if (xdr && !xdr(rqstp, (u32*)rqstp->rq_arg.head[0].iov_base, + if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, rqstp->rq_argp)) { dprintk("nfsd: failed to decode arguments!\n"); nfsd_cache_update(rqstp, RC_NOCACHE, NULL); @@ -426,7 +528,7 @@ nfsd_dispatch(struct svc_rqst *rqstp, u32 *statp) */ nfserrp = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len; - rqstp->rq_res.head[0].iov_len += sizeof(u32); + rqstp->rq_res.head[0].iov_len += sizeof(__be32); /* Now call the procedure handler, and encode NFS status. */ nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);