diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/nfsd/nfssvc.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/nfsd/nfssvc.c | 690 |
1 files changed, 0 insertions, 690 deletions
diff --git a/ANDROID_3.4.5/fs/nfsd/nfssvc.c b/ANDROID_3.4.5/fs/nfsd/nfssvc.c deleted file mode 100644 index bcda12a3..00000000 --- a/ANDROID_3.4.5/fs/nfsd/nfssvc.c +++ /dev/null @@ -1,690 +0,0 @@ -/* - * Central processing for nfsd. - * - * Authors: Olaf Kirch (okir@monad.swb.de) - * - * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> - */ - -#include <linux/sched.h> -#include <linux/freezer.h> -#include <linux/module.h> -#include <linux/fs_struct.h> -#include <linux/swap.h> -#include <linux/nsproxy.h> - -#include <linux/sunrpc/stats.h> -#include <linux/sunrpc/svcsock.h> -#include <linux/lockd/bind.h> -#include <linux/nfsacl.h> -#include <linux/seq_file.h> -#include <net/net_namespace.h> -#include "nfsd.h" -#include "cache.h" -#include "vfs.h" - -#define NFSDDBG_FACILITY NFSDDBG_SVC - -extern struct svc_program nfsd_program; -static int nfsd(void *vrqstp); -struct timeval nfssvc_boot; - -/* - * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members - * of the svc_serv struct. In particular, ->sv_nrthreads but also to some - * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt - * - * If (out side the lock) nfsd_serv is non-NULL, then it must point to a - * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number - * of nfsd threads must exist and each must listed in ->sp_all_threads in each - * entry of ->sv_pools[]. - * - * Transitions of the thread count between zero and non-zero are of particular - * interest since the svc_serv needs to be created and initialized at that - * point, or freed. - * - * Finally, the nfsd_mutex also protects some of the global variables that are - * accessed when nfsd starts and that are settable via the write_* routines in - * nfsctl.c. In particular: - * - * user_recovery_dirname - * user_lease_time - * nfsd_versions - */ -DEFINE_MUTEX(nfsd_mutex); -struct svc_serv *nfsd_serv; - -/* - * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used. - * nfsd_drc_max_pages limits the total amount of memory available for - * version 4.1 DRC caches. - * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage. - */ -spinlock_t nfsd_drc_lock; -unsigned int nfsd_drc_max_mem; -unsigned int nfsd_drc_mem_used; - -#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[] = { - [2] = &nfsd_acl_version2, - [3] = &nfsd_acl_version3, -}; - -#define NFSD_ACL_MINVERS 2 -#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 = "nfsacl", - .pg_class = "nfsd", - .pg_stats = &nfsd_acl_svcstats, - .pg_authenticate = &svc_set_client, -}; - -static struct svc_stat nfsd_acl_svcstats = { - .program = &nfsd_acl_program, -}; -#endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ - -static struct svc_version * nfsd_version[] = { - [2] = &nfsd_version2, -#if defined(CONFIG_NFSD_V3) - [3] = &nfsd_version3, -#endif -#if defined(CONFIG_NFSD_V4) - [4] = &nfsd_version4, -#endif -}; - -#define NFSD_MINVERS 2 -#define NFSD_NRVERS ARRAY_SIZE(nfsd_version) -static struct svc_version *nfsd_versions[NFSD_NRVERS]; - -struct svc_program nfsd_program = { -#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) - .pg_next = &nfsd_acl_program, -#endif - .pg_prog = NFS_PROGRAM, /* program number */ - .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ - .pg_vers = nfsd_versions, /* version table */ - .pg_name = "nfsd", /* program name */ - .pg_class = "nfsd", /* authentication class */ - .pg_stats = &nfsd_svcstats, /* version table */ - .pg_authenticate = &svc_set_client, /* export authentication */ - -}; - -u32 nfsd_supported_minorversion; - -int nfsd_vers(int vers, enum vers_op change) -{ - if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) - return 0; - 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; -} - -int nfsd_minorversion(u32 minorversion, enum vers_op change) -{ - if (minorversion > NFSD_SUPPORTED_MINOR_VERSION) - return -1; - switch(change) { - case NFSD_SET: - nfsd_supported_minorversion = minorversion; - break; - case NFSD_CLEAR: - if (minorversion == 0) - return -1; - nfsd_supported_minorversion = minorversion - 1; - break; - case NFSD_TEST: - return minorversion <= nfsd_supported_minorversion; - case NFSD_AVAIL: - return minorversion <= NFSD_SUPPORTED_MINOR_VERSION; - } - return 0; -} - -/* - * Maximum number of nfsd processes - */ -#define NFSD_MAXSERVS 8192 - -int nfsd_nrthreads(void) -{ - int rv = 0; - mutex_lock(&nfsd_mutex); - if (nfsd_serv) - rv = nfsd_serv->sv_nrthreads; - mutex_unlock(&nfsd_mutex); - return rv; -} - -static int nfsd_init_socks(int port) -{ - int error; - if (!list_empty(&nfsd_serv->sv_permsocks)) - return 0; - - error = svc_create_xprt(nfsd_serv, "udp", &init_net, PF_INET, port, - SVC_SOCK_DEFAULTS); - if (error < 0) - return error; - - error = svc_create_xprt(nfsd_serv, "tcp", &init_net, PF_INET, port, - SVC_SOCK_DEFAULTS); - if (error < 0) - return error; - - return 0; -} - -static bool nfsd_up = false; - -static int nfsd_startup(unsigned short port, int nrservs) -{ - int ret; - - if (nfsd_up) - return 0; - /* - * Readahead param cache - will no-op if it already exists. - * (Note therefore results will be suboptimal if number of - * threads is modified after nfsd start.) - */ - ret = nfsd_racache_init(2*nrservs); - if (ret) - return ret; - ret = nfsd_init_socks(port); - if (ret) - goto out_racache; - ret = lockd_up(&init_net); - if (ret) - goto out_racache; - ret = nfs4_state_start(); - if (ret) - goto out_lockd; - nfsd_up = true; - return 0; -out_lockd: - lockd_down(&init_net); -out_racache: - nfsd_racache_shutdown(); - return ret; -} - -static void nfsd_shutdown(void) -{ - /* - * write_ports can create the server without actually starting - * any threads--if we get shut down before any threads are - * started, then nfsd_last_thread will be run before any of this - * other initialization has been done. - */ - if (!nfsd_up) - return; - nfs4_state_shutdown(); - lockd_down(&init_net); - nfsd_racache_shutdown(); - nfsd_up = false; -} - -static void nfsd_last_thread(struct svc_serv *serv, struct net *net) -{ - /* When last nfsd thread exits we need to do some clean-up */ - nfsd_serv = NULL; - nfsd_shutdown(); - - svc_rpcb_cleanup(serv, net); - - printk(KERN_WARNING "nfsd: last server has exited, flushing export " - "cache\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 - } -} - -/* - * Each session guarantees a negotiated per slot memory cache for replies - * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated - * NFSv4.1 server might want to use more memory for a DRC than a machine - * with mutiple services. - * - * Impose a hard limit on the number of pages for the DRC which varies - * according to the machines free pages. This is of course only a default. - * - * For now this is a #defined shift which could be under admin control - * in the future. - */ -static void set_max_drc(void) -{ - #define NFSD_DRC_SIZE_SHIFT 10 - nfsd_drc_max_mem = (nr_free_buffer_pages() - >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE; - nfsd_drc_mem_used = 0; - spin_lock_init(&nfsd_drc_lock); - dprintk("%s nfsd_drc_max_mem %u \n", __func__, nfsd_drc_max_mem); -} - -static int nfsd_get_default_max_blksize(void) -{ - struct sysinfo i; - unsigned long long target; - unsigned long ret; - - si_meminfo(&i); - target = (i.totalram - i.totalhigh) << PAGE_SHIFT; - /* - * 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. - */ - target >>= 12; - - ret = NFSSVC_MAXBLKSIZE; - while (ret > target && ret >= 8*1024*2) - ret /= 2; - return ret; -} - -int nfsd_create_serv(void) -{ - int error; - - WARN_ON(!mutex_is_locked(&nfsd_mutex)); - if (nfsd_serv) { - svc_get(nfsd_serv); - return 0; - } - if (nfsd_max_blksize == 0) - nfsd_max_blksize = nfsd_get_default_max_blksize(); - nfsd_reset_versions(); - nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, - nfsd_last_thread, nfsd, THIS_MODULE); - if (nfsd_serv == NULL) - return -ENOMEM; - - error = svc_bind(nfsd_serv, current->nsproxy->net_ns); - if (error < 0) { - svc_destroy(nfsd_serv); - return error; - } - - set_max_drc(); - do_gettimeofday(&nfssvc_boot); /* record boot time */ - 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; - struct net *net = &init_net; - - WARN_ON(!mutex_is_locked(&nfsd_mutex)); - - 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 */ - 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; - } - - if (nfsd_serv->sv_nrthreads == 1) - svc_shutdown_net(nfsd_serv, net); - svc_destroy(nfsd_serv); - - return err; -} - -/* - * Adjust the number of threads and return the new number of threads. - * This is also the function that starts the server if necessary, if - * this is the first time nrservs is nonzero. - */ -int -nfsd_svc(unsigned short port, int nrservs) -{ - int error; - bool nfsd_up_before; - struct net *net = &init_net; - - mutex_lock(&nfsd_mutex); - dprintk("nfsd: creating service\n"); - if (nrservs <= 0) - nrservs = 0; - if (nrservs > NFSD_MAXSERVS) - nrservs = NFSD_MAXSERVS; - error = 0; - if (nrservs == 0 && nfsd_serv == NULL) - goto out; - - error = nfsd_create_serv(); - if (error) - goto out; - - nfsd_up_before = nfsd_up; - - error = nfsd_startup(port, nrservs); - if (error) - goto out_destroy; - error = svc_set_num_threads(nfsd_serv, NULL, nrservs); - if (error) - goto out_shutdown; - /* We are holding a reference to nfsd_serv which - * we don't want to count in the return value, - * so subtract 1 - */ - error = nfsd_serv->sv_nrthreads - 1; -out_shutdown: - if (error < 0 && !nfsd_up_before) - nfsd_shutdown(); -out_destroy: - if (nfsd_serv->sv_nrthreads == 1) - svc_shutdown_net(nfsd_serv, net); - svc_destroy(nfsd_serv); /* Release server */ -out: - mutex_unlock(&nfsd_mutex); - return error; -} - - -/* - * This is the NFS server kernel thread - */ -static int -nfsd(void *vrqstp) -{ - struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; - int err, preverr = 0; - - /* Lock module and set up kernel thread */ - mutex_lock(&nfsd_mutex); - - /* At this point, the thread shares current->fs - * with the init process. We need to create files with a - * umask of 0 instead of init's umask. */ - if (unshare_fs_struct() < 0) { - printk("Unable to start nfsd thread: out of memory\n"); - goto out; - } - - current->fs->umask = 0; - - /* - * thread is spawned with all signals set to SIG_IGN, re-enable - * the ones that will bring down the thread - */ - allow_signal(SIGKILL); - allow_signal(SIGHUP); - allow_signal(SIGINT); - allow_signal(SIGQUIT); - - nfsdstats.th_cnt++; - mutex_unlock(&nfsd_mutex); - - /* - * We want less throttling in balance_dirty_pages() so that nfs to - * localhost doesn't cause nfsd to lock up due to all the client's - * dirty pages. - */ - current->flags |= PF_LESS_THROTTLE; - set_freezable(); - - /* - * The main request loop - */ - for (;;) { - /* - * Find a socket with data available and call its - * recvfrom routine. - */ - while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) - ; - if (err == -EINTR) - break; - else if (err < 0) { - if (err != preverr) { - printk(KERN_WARNING "%s: unexpected error " - "from svc_recv (%d)\n", __func__, -err); - preverr = err; - } - schedule_timeout_uninterruptible(HZ); - continue; - } - - validate_process_creds(); - svc_process(rqstp); - validate_process_creds(); - } - - /* Clear signals before calling svc_exit_thread() */ - flush_signals(current); - - mutex_lock(&nfsd_mutex); - nfsdstats.th_cnt --; - -out: - if (rqstp->rq_server->sv_nrthreads == 1) - svc_shutdown_net(rqstp->rq_server, &init_net); - - /* Release the thread */ - svc_exit_thread(rqstp); - - /* Release module */ - mutex_unlock(&nfsd_mutex); - module_put_and_exit(0); - return 0; -} - -static __be32 map_new_errors(u32 vers, __be32 nfserr) -{ - if (nfserr == nfserr_jukebox && vers == 2) - return nfserr_dropit; - if (nfserr == nfserr_wrongsec && vers < 4) - return nfserr_acces; - return nfserr; -} - -int -nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) -{ - struct svc_procedure *proc; - kxdrproc_t xdr; - __be32 nfserr; - __be32 *nfserrp; - - dprintk("nfsd_dispatch: vers %d proc %d\n", - rqstp->rq_vers, rqstp->rq_proc); - proc = rqstp->rq_procinfo; - - /* - * Give the xdr decoder a chance to change this if it wants - * (necessary in the NFSv4.0 compound case) - */ - rqstp->rq_cachetype = proc->pc_cachetype; - /* Decode arguments */ - xdr = proc->pc_decode; - if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, - rqstp->rq_argp)) { - dprintk("nfsd: failed to decode arguments!\n"); - *statp = rpc_garbage_args; - return 1; - } - - /* Check whether we have this call in the cache. */ - switch (nfsd_cache_lookup(rqstp)) { - case RC_INTR: - case RC_DROPIT: - return 0; - case RC_REPLY: - return 1; - case RC_DOIT:; - /* do it */ - } - - /* need to grab the location to store the status, as - * nfsv4 does some encoding while processing - */ - nfserrp = rqstp->rq_res.head[0].iov_base - + rqstp->rq_res.head[0].iov_len; - 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); - nfserr = map_new_errors(rqstp->rq_vers, nfserr); - if (nfserr == nfserr_dropit || rqstp->rq_dropme) { - dprintk("nfsd: Dropping request; may be revisited later\n"); - nfsd_cache_update(rqstp, RC_NOCACHE, NULL); - return 0; - } - - if (rqstp->rq_proc != 0) - *nfserrp++ = nfserr; - - /* Encode result. - * For NFSv2, additional info is never returned in case of an error. - */ - if (!(nfserr && rqstp->rq_vers == 2)) { - xdr = proc->pc_encode; - if (xdr && !xdr(rqstp, nfserrp, - rqstp->rq_resp)) { - /* Failed to encode result. Release cache entry */ - dprintk("nfsd: failed to encode result!\n"); - nfsd_cache_update(rqstp, RC_NOCACHE, NULL); - *statp = rpc_system_err; - return 1; - } - } - - /* Store reply in cache. */ - nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1); - return 1; -} - -int nfsd_pool_stats_open(struct inode *inode, struct file *file) -{ - int ret; - mutex_lock(&nfsd_mutex); - if (nfsd_serv == NULL) { - mutex_unlock(&nfsd_mutex); - return -ENODEV; - } - /* bump up the psudo refcount while traversing */ - svc_get(nfsd_serv); - ret = svc_pool_stats_open(nfsd_serv, file); - mutex_unlock(&nfsd_mutex); - return ret; -} - -int nfsd_pool_stats_release(struct inode *inode, struct file *file) -{ - int ret = seq_release(inode, file); - struct net *net = &init_net; - - mutex_lock(&nfsd_mutex); - /* this function really, really should have been called svc_put() */ - if (nfsd_serv->sv_nrthreads == 1) - svc_shutdown_net(nfsd_serv, net); - svc_destroy(nfsd_serv); - mutex_unlock(&nfsd_mutex); - return ret; -} |