diff options
Diffstat (limited to 'fs/nfs/callback.c')
-rw-r--r-- | fs/nfs/callback.c | 214 |
1 files changed, 179 insertions, 35 deletions
diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c index 6e3bd42..7f604c7 100644 --- a/fs/nfs/callback.c +++ b/fs/nfs/callback.c @@ -17,6 +17,9 @@ #include <linux/freezer.h> #include <linux/kthread.h> #include <linux/sunrpc/svcauth_gss.h> +#if defined(CONFIG_NFS_V4_1) +#include <linux/sunrpc/bc_xprt.h> +#endif #include <net/inet_sock.h> @@ -28,11 +31,12 @@ struct nfs_callback_data { unsigned int users; + struct svc_serv *serv; struct svc_rqst *rqst; struct task_struct *task; }; -static struct nfs_callback_data nfs_callback_info; +static struct nfs_callback_data nfs_callback_info[NFS4_MAX_MINOR_VERSION + 1]; static DEFINE_MUTEX(nfs_callback_mutex); static struct svc_program nfs4_callback_program; @@ -56,10 +60,10 @@ module_param_call(callback_tcpport, param_set_port, param_get_int, &nfs_callback_set_tcpport, 0644); /* - * This is the callback kernel thread. + * This is the NFSv4 callback kernel thread. */ static int -nfs_callback_svc(void *vrqstp) +nfs4_callback_svc(void *vrqstp) { int err, preverr = 0; struct svc_rqst *rqstp = vrqstp; @@ -97,20 +101,12 @@ nfs_callback_svc(void *vrqstp) } /* - * Bring up the callback thread if it is not already up. + * Prepare to bring up the NFSv4 callback service */ -int nfs_callback_up(void) +struct svc_rqst * +nfs4_callback_up(struct svc_serv *serv) { - struct svc_serv *serv = NULL; - int ret = 0; - - mutex_lock(&nfs_callback_mutex); - if (nfs_callback_info.users++ || nfs_callback_info.task != NULL) - goto out; - serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, NULL); - ret = -ENOMEM; - if (!serv) - goto out_err; + int ret; ret = svc_create_xprt(serv, "tcp", PF_INET, nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS); @@ -133,23 +129,168 @@ int nfs_callback_up(void) goto out_err; #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ - nfs_callback_info.rqst = svc_prepare_thread(serv, &serv->sv_pools[0]); - if (IS_ERR(nfs_callback_info.rqst)) { - ret = PTR_ERR(nfs_callback_info.rqst); - nfs_callback_info.rqst = NULL; + return svc_prepare_thread(serv, &serv->sv_pools[0]); + +out_err: + if (ret == 0) + ret = -ENOMEM; + return ERR_PTR(ret); +} + +#if defined(CONFIG_NFS_V4_1) +/* + * The callback service for NFSv4.1 callbacks + */ +static int +nfs41_callback_svc(void *vrqstp) +{ + struct svc_rqst *rqstp = vrqstp; + struct svc_serv *serv = rqstp->rq_server; + struct rpc_rqst *req; + int error; + DEFINE_WAIT(wq); + + set_freezable(); + + /* + * FIXME: do we really need to run this under the BKL? If so, please + * add a comment about what it's intended to protect. + */ + lock_kernel(); + while (!kthread_should_stop()) { + prepare_to_wait(&serv->sv_cb_waitq, &wq, TASK_INTERRUPTIBLE); + spin_lock_bh(&serv->sv_cb_lock); + if (!list_empty(&serv->sv_cb_list)) { + req = list_first_entry(&serv->sv_cb_list, + struct rpc_rqst, rq_bc_list); + list_del(&req->rq_bc_list); + spin_unlock_bh(&serv->sv_cb_lock); + dprintk("Invoking bc_svc_process()\n"); + error = bc_svc_process(serv, req, rqstp); + dprintk("bc_svc_process() returned w/ error code= %d\n", + error); + } else { + spin_unlock_bh(&serv->sv_cb_lock); + schedule(); + } + finish_wait(&serv->sv_cb_waitq, &wq); + } + unlock_kernel(); + return 0; +} + +/* + * Bring up the NFSv4.1 callback service + */ +struct svc_rqst * +nfs41_callback_up(struct svc_serv *serv, struct rpc_xprt *xprt) +{ + struct svc_xprt *bc_xprt; + struct svc_rqst *rqstp = ERR_PTR(-ENOMEM); + + dprintk("--> %s\n", __func__); + /* Create a svc_sock for the service */ + bc_xprt = svc_sock_create(serv, xprt->prot); + if (!bc_xprt) + goto out; + + /* + * Save the svc_serv in the transport so that it can + * be referenced when the session backchannel is initialized + */ + serv->bc_xprt = bc_xprt; + xprt->bc_serv = serv; + + INIT_LIST_HEAD(&serv->sv_cb_list); + spin_lock_init(&serv->sv_cb_lock); + init_waitqueue_head(&serv->sv_cb_waitq); + rqstp = svc_prepare_thread(serv, &serv->sv_pools[0]); + if (IS_ERR(rqstp)) + svc_sock_destroy(bc_xprt); +out: + dprintk("--> %s return %p\n", __func__, rqstp); + return rqstp; +} + +static inline int nfs_minorversion_callback_svc_setup(u32 minorversion, + struct svc_serv *serv, struct rpc_xprt *xprt, + struct svc_rqst **rqstpp, int (**callback_svc)(void *vrqstp)) +{ + if (minorversion) { + *rqstpp = nfs41_callback_up(serv, xprt); + *callback_svc = nfs41_callback_svc; + } + return minorversion; +} + +static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt, + struct nfs_callback_data *cb_info) +{ + if (minorversion) + xprt->bc_serv = cb_info->serv; +} +#else +static inline int nfs_minorversion_callback_svc_setup(u32 minorversion, + struct svc_serv *serv, struct rpc_xprt *xprt, + struct svc_rqst **rqstpp, int (**callback_svc)(void *vrqstp)) +{ + return 0; +} + +static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt, + struct nfs_callback_data *cb_info) +{ +} +#endif /* CONFIG_NFS_V4_1 */ + +/* + * Bring up the callback thread if it is not already up. + */ +int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt) +{ + struct svc_serv *serv = NULL; + struct svc_rqst *rqstp; + int (*callback_svc)(void *vrqstp); + struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion]; + char svc_name[12]; + int ret = 0; + int minorversion_setup; + + mutex_lock(&nfs_callback_mutex); + if (cb_info->users++ || cb_info->task != NULL) { + nfs_callback_bc_serv(minorversion, xprt, cb_info); + goto out; + } + serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, NULL); + if (!serv) { + ret = -ENOMEM; + goto out_err; + } + + minorversion_setup = nfs_minorversion_callback_svc_setup(minorversion, + serv, xprt, &rqstp, &callback_svc); + if (!minorversion_setup) { + /* v4.0 callback setup */ + rqstp = nfs4_callback_up(serv); + callback_svc = nfs4_callback_svc; + } + + if (IS_ERR(rqstp)) { + ret = PTR_ERR(rqstp); goto out_err; } svc_sock_update_bufs(serv); - nfs_callback_info.task = kthread_run(nfs_callback_svc, - nfs_callback_info.rqst, - "nfsv4-svc"); - if (IS_ERR(nfs_callback_info.task)) { - ret = PTR_ERR(nfs_callback_info.task); - svc_exit_thread(nfs_callback_info.rqst); - nfs_callback_info.rqst = NULL; - nfs_callback_info.task = NULL; + sprintf(svc_name, "nfsv4.%u-svc", minorversion); + cb_info->serv = serv; + cb_info->rqst = rqstp; + cb_info->task = kthread_run(callback_svc, cb_info->rqst, svc_name); + if (IS_ERR(cb_info->task)) { + ret = PTR_ERR(cb_info->task); + svc_exit_thread(cb_info->rqst); + cb_info->rqst = NULL; + cb_info->task = NULL; goto out_err; } out: @@ -166,22 +307,25 @@ out: out_err: dprintk("NFS: Couldn't create callback socket or server thread; " "err = %d\n", ret); - nfs_callback_info.users--; + cb_info->users--; goto out; } /* * Kill the callback thread if it's no longer being used. */ -void nfs_callback_down(void) +void nfs_callback_down(int minorversion) { + struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion]; + mutex_lock(&nfs_callback_mutex); - nfs_callback_info.users--; - if (nfs_callback_info.users == 0 && nfs_callback_info.task != NULL) { - kthread_stop(nfs_callback_info.task); - svc_exit_thread(nfs_callback_info.rqst); - nfs_callback_info.rqst = NULL; - nfs_callback_info.task = NULL; + cb_info->users--; + if (cb_info->users == 0 && cb_info->task != NULL) { + kthread_stop(cb_info->task); + svc_exit_thread(cb_info->rqst); + cb_info->serv = NULL; + cb_info->rqst = NULL; + cb_info->task = NULL; } mutex_unlock(&nfs_callback_mutex); } |