// SPDX-License-Identifier: GPL-2.0-only/* * linux/fs/lockd/clntproc.c * * RPC procedures for the client side NLM implementation * * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> */ #include <linux/module.h>#include <linux/slab.h>#include <linux/types.h>#include <linux/errno.h>#include <linux/fs.h>#include <linux/filelock.h>#include <linux/nfs_fs.h>#include <linux/utsname.h>#include <linux/freezer.h>#include <linux/sunrpc/clnt.h>#include <linux/sunrpc/svc.h> #include "lockd.h"#include "trace.h" #define NLMDBG_FACILITY NLMDBG_CLIENT#define NLMCLNT_GRACE_WAIT (5*HZ)#define NLMCLNT_POLL_TIMEOUT (30*HZ)#define NLMCLNT_MAX_RETRIES 3 static int nlmclnt_test(struct nlm_rqst *, struct file_lock *);static int nlmclnt_lock(struct nlm_rqst *, struct file_lock *);static int nlmclnt_unlock(struct nlm_rqst *, struct file_lock *);static int nlm_stat_to_errno(__be32 stat);static void nlmclnt_locks_init_private(struct file_lock *fl, struct nlm_host *host);static int nlmclnt_cancel(struct nlm_host *, int , struct file_lock *); static const struct rpc_call_ops nlmclnt_unlock_ops;static const struct rpc_call_ops nlmclnt_cancel_ops; /* * Cookie counter for NLM requests */static atomic_t nlm_cookie = ATOMIC_INIT(0x1234); void nlmclnt_next_cookie(struct lockd_cookie *c){ u32 cookie = atomic_inc_return(&nlm_cookie); memcpy(c->data, &cookie, 4); c->len=4;} static struct nlm_lockowner *nlmclnt_get_lockowner(struct nlm_lockowner *lockowner){ refcount_inc(&lockowner->count); return lockowner;} static void nlmclnt_put_lockowner(struct nlm_lockowner *lockowner){ if (!refcount_dec_and_lock(&lockowner->count, &lockowner->host->h_lock)) return; list_del(&lockowner->list); spin_unlock(&lockowner->host->h_lock); nlmclnt_release_host(lockowner->host); kfree(lockowner);} static inline int nlm_pidbusy(struct nlm_host *host, uint32_t pid){ struct nlm_lockowner *lockowner; list_for_each_entry(lockowner, &host->h_lockowners, list) { if (lockowner->pid == pid) return -EBUSY; } return 0;} static inline uint32_t __nlm_alloc_pid(struct nlm_host *host){ uint32_t res; do { res = host->h_pidcount++; } while (nlm_pidbusy(host, res) < 0); return res;} static struct nlm_lockowner *__nlmclnt_find_lockowner(struct nlm_host *host, fl_owner_t owner){ struct nlm_lockowner *lockowner; list_for_each_entry(lockowner, &host->h_lockowners, list) { if (lockowner->owner != owner) continue; return nlmclnt_get_lockowner(lockowner); } return NULL;} static struct nlm_lockowner *nlmclnt_find_lockowner(struct nlm_host *host, fl_owner_t owner){ struct nlm_lockowner *res, *new = NULL; spin_lock(&host->h_lock); res = __nlmclnt_find_lockowner(host, owner); if (res == NULL) { spin_unlock(&host->h_lock); new = kmalloc_obj(*new); spin_lock(&host->h_lock); res = __nlmclnt_find_lockowner(host, owner); if (res == NULL && new != NULL) { res = new; refcount_set(&new->count, 1); new->owner = owner; new->pid = __nlm_alloc_pid(host); new->host = nlm_get_host(host); list_add(&new->list, &host->h_lockowners); new = NULL; } } spin_unlock(&host->h_lock); kfree(new); return res;} /* * Initialize arguments for TEST/LOCK/UNLOCK/CANCEL calls */static void nlmclnt_setlockargs(struct nlm_rqst *req, struct file_lock *fl){ struct lockd_args *argp = &req->a_args; struct lockd_lock *lock = &argp->lock; char *nodename = req->a_host->h_rpcclnt->cl_nodename; nlmclnt_next_cookie(&argp->cookie); memcpy(&lock->fh, NFS_FH(file_inode(fl->c.flc_file)), sizeof(struct nfs_fh)); lock->caller = nodename; lock->oh.data = req->a_owner; lock->oh.len = snprintf(req->a_owner, sizeof(req->a_owner), "%u@%s", (unsigned int)fl->fl_u.nfs_fl.owner->pid, nodename); lock->svid = fl->fl_u.nfs_fl.owner->pid; lock->fl.fl_start = fl->fl_start; lock->fl.fl_end = fl->fl_end; lock->fl.c.flc_type = fl->c.flc_type;} static void nlmclnt_release_lockargs(struct nlm_rqst *req){ WARN_ON_ONCE(req->a_args.lock.fl.fl_ops != NULL);} /** * nlmclnt_proc - Perform a single client-side lock request * @host: address of a valid nlm_host context representing the NLM server * @cmd: fcntl-style file lock operation to perform * @fl: address of arguments for the lock operation * @data: address of data to be sent to callback operations * */int nlmclnt_proc(struct nlm_host *host, int cmd, struct file_lock *fl, void *data){ struct nlm_rqst *call; int status; const struct nlmclnt_operations *nlmclnt_ops = host->h_nlmclnt_ops; call = nlm_alloc_call(host); if (call == NULL) return -ENOMEM; if (nlmclnt_ops && nlmclnt_ops->nlmclnt_alloc_call) nlmclnt_ops->nlmclnt_alloc_call(data); nlmclnt_locks_init_private(fl, host); if (!fl->fl_u.nfs_fl.owner) { /* lockowner allocation has failed */ nlmclnt_release_call(call); return -ENOMEM; } /* Set up the argument struct */ nlmclnt_setlockargs(call, fl); call->a_callback_data = data; if (IS_SETLK(cmd) || IS_SETLKW(cmd)) { if (fl->c.flc_type != F_UNLCK) { call->a_args.block = IS_SETLKW(cmd) ? 1 : 0; status = nlmclnt_lock(call, fl); } else status = nlmclnt_unlock(call, fl); } else if (IS_GETLK(cmd)) status = nlmclnt_test(call, fl); else status = -EINVAL; fl->fl_ops->fl_release_private(fl); fl->fl_ops = NULL; dprintk("lockd: clnt proc returns %d\n", status); return status;}EXPORT_SYMBOL_GPL(nlmclnt_proc); /* * Allocate an NLM RPC call struct */struct nlm_rqst *nlm_alloc_call(struct nlm_host *host){ struct nlm_rqst *call; for(;;) { call = kzalloc_obj(*call); if (call != NULL) { refcount_set(&call->a_count, 1); locks_init_lock(&call->a_args.lock.fl); locks_init_lock(&call->a_res.lock.fl); call->a_host = nlm_get_host(host); return call; } if (signalled()) break; printk("nlm_alloc_call: failed, waiting for memory\n"); schedule_timeout_interruptible(5*HZ); } return NULL;} void nlmclnt_release_call(struct nlm_rqst *call){ const struct nlmclnt_operations *nlmclnt_ops = call->a_host->h_nlmclnt_ops; if (!refcount_dec_and_test(&call->a_count)) return; if (nlmclnt_ops && nlmclnt_ops->nlmclnt_release_call) nlmclnt_ops->nlmclnt_release_call(call->a_callback_data); nlmclnt_release_host(call->a_host); nlmclnt_release_lockargs(call); kfree(call);} static void nlmclnt_rpc_release(void *data){ nlmclnt_release_call(data);} static int nlm_wait_on_grace(wait_queue_head_t *queue){ DEFINE_WAIT(wait); int status = -EINTR; prepare_to_wait(queue, &wait, TASK_INTERRUPTIBLE); if (!signalled ()) { schedule_timeout(NLMCLNT_GRACE_WAIT); try_to_freeze(); if (!signalled ()) status = 0; } finish_wait(queue, &wait); return status;} /* * Generic NLM call */static intnlmclnt_call(const struct cred *cred, struct nlm_rqst *req, u32 proc){ struct nlm_host *host = req->a_host; struct rpc_clnt *clnt; struct lockd_args *argp = &req->a_args; struct lockd_res *resp = &req->a_res; struct rpc_message msg = { .rpc_argp = argp, .rpc_resp = resp, .rpc_cred = cred, }; int status; dprintk("lockd: call procedure %d on %s\n", (int)proc, host->h_name); do { if (host->h_reclaiming && !argp->reclaim) goto in_grace_period; /* If we have no RPC client yet, create one. */ if ((clnt = nlm_bind_host(host)) == NULL) return -ENOLCK; msg.rpc_proc = &clnt->cl_procinfo[proc]; /* Perform the RPC call. If an error occurs, try again */ if ((status = rpc_call_sync(clnt, &msg, 0)) < 0) { dprintk("lockd: rpc_call returned error %d\n", -status); switch (status) { case -EPROTONOSUPPORT: status = -EINVAL; break; case -ECONNREFUSED: case -ETIMEDOUT: case -ENOTCONN: nlm_rebind_host(host); status = -EAGAIN; break; case -ERESTARTSYS: return signalled () ? -EINTR : status; default: break; } break; } else if (resp->status == nlm_lck_denied_grace_period) { dprintk("lockd: server in grace period\n"); if (argp->reclaim) { printk(KERN_WARNING "lockd: spurious grace period reject?!\n"); return -ENOLCK; } } else { if (!argp->reclaim) { /* We appear to be out of the grace period */ wake_up_all(&host->h_gracewait); } dprintk("lockd: server returns status %d\n", ntohl(resp->status)); return 0; /* Okay, call complete */ } in_grace_period: /* * The server has rebooted and appears to be in the grace * period during which locks are only allowed to be * reclaimed. * We can only back off and try again later. */ status = nlm_wait_on_grace(&host->h_gracewait); } while (status == 0); return status;} /* * Generic NLM call, async version. */static struct rpc_task *__nlm_async_call(struct nlm_rqst *req, u32 proc, struct rpc_message *msg, const struct rpc_call_ops *tk_ops){ struct nlm_host *host = req->a_host; struct rpc_clnt *clnt; struct rpc_task_setup task_setup_data = { .rpc_message = msg, .callback_ops = tk_ops, .callback_data = req, .flags = RPC_TASK_ASYNC, }; dprintk("lockd: call procedure %d on %s (async)\n", (int)proc, host->h_name); /* If we have no RPC client yet, create one. */ clnt = nlm_bind_host(host); if (clnt == NULL) goto out_err; msg->rpc_proc = &clnt->cl_procinfo[proc]; task_setup_data.rpc_client = clnt; /* bootstrap and kick off the async RPC call */ return rpc_run_task(&task_setup_data);out_err: tk_ops->rpc_release(req); return ERR_PTR(-ENOLCK);} static int nlm_do_async_call(struct nlm_rqst *req, u32 proc, struct rpc_message *msg, const struct rpc_call_ops *tk_ops){ struct rpc_task *task; task = __nlm_async_call(req, proc, msg, tk_ops); if (IS_ERR(task)) return PTR_ERR(task); rpc_put_task(task); return 0;} /* * NLM asynchronous call. */int nlm_async_call(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops){ struct rpc_message msg = { .rpc_argp = &req->a_args, .rpc_resp = &req->a_res, }; return nlm_do_async_call(req, proc, &msg, tk_ops);} int nlm_async_reply(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops){ struct rpc_message msg = { .rpc_argp = &req->a_res, }; return nlm_do_async_call(req, proc, &msg, tk_ops);} /* * NLM client asynchronous call. * * Note that although the calls are asynchronous, and are therefore * guaranteed to complete, we still always attempt to wait for * completion in order to be able to correctly track the lock * state. */static int nlmclnt_async_call(const struct cred *cred, struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops){ struct rpc_message msg = { .rpc_argp = &req->a_args, .rpc_resp = &req->a_res, .rpc_cred = cred, }; struct rpc_task *task; int err; task = __nlm_async_call(req, proc, &msg, tk_ops); if (IS_ERR(task)) return PTR_ERR(task); err = rpc_wait_for_completion_task(task); rpc_put_task(task); return err;} /* * TEST for the presence of a conflicting lock */static intnlmclnt_test(struct nlm_rqst *req, struct file_lock *fl){ int status; status = nlmclnt_call(nfs_file_cred(fl->c.flc_file), req, NLMPROC_TEST); if (status < 0) goto out; switch (req->a_res.status) { case nlm_granted: fl->c.flc_type = F_UNLCK; break; case nlm_lck_denied: /* * Report the conflicting lock back to the application. */ fl->fl_start = req->a_res.lock.fl.fl_start; fl->fl_end = req->a_res.lock.fl.fl_end; fl->c.flc_type = req->a_res.lock.fl.c.flc_type; fl->c.flc_pid = -req->a_res.lock.fl.c.flc_pid; break; default: status = nlm_stat_to_errno(req->a_res.status); }out: trace_nlmclnt_test(&req->a_args.lock, (const struct sockaddr *)&req->a_host->h_addr, req->a_host->h_addrlen, req->a_res.status); nlmclnt_release_call(req); return status;} static void nlmclnt_locks_copy_lock(struct file_lock *new, struct file_lock *fl){ spin_lock(&fl->fl_u.nfs_fl.owner->host->h_lock); new->fl_u.nfs_fl.state = fl->fl_u.nfs_fl.state; new->fl_u.nfs_fl.owner = nlmclnt_get_lockowner(fl->fl_u.nfs_fl.owner); list_add_tail(&new->fl_u.nfs_fl.list, &fl->fl_u.nfs_fl.owner->host->h_granted); spin_unlock(&fl->fl_u.nfs_fl.owner->host->h_lock);} static void nlmclnt_locks_release_private(struct file_lock *fl){ spin_lock(&fl->fl_u.nfs_fl.owner->host->h_lock); list_del(&fl->fl_u.nfs_fl.list); spin_unlock(&fl->fl_u.nfs_fl.owner->host->h_lock); nlmclnt_put_lockowner(fl->fl_u.nfs_fl.owner);} static const struct file_lock_operations nlmclnt_lock_ops = { .fl_copy_lock = nlmclnt_locks_copy_lock, .fl_release_private = nlmclnt_locks_release_private,}; static void nlmclnt_locks_init_private(struct file_lock *fl, struct nlm_host *host){ fl->fl_u.nfs_fl.state = 0; fl->fl_ops = NULL; fl->fl_u.nfs_fl.owner = nlmclnt_find_lockowner(host, fl->c.flc_owner); INIT_LIST_HEAD(&fl->fl_u.nfs_fl.list); if (!fl->fl_u.nfs_fl.owner) return; fl->fl_ops = &nlmclnt_lock_ops;} static int do_vfs_lock(struct file_lock *fl){Lines 1–500 of 892. 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// SPDX-License-Identifier: GPL-2.0-only /* * linux/fs/lockd/clntproc.c * * RPC procedures for the client side NLM implementation * * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> */ #include <linux/module.h> #include <linux/slab.h> #include <linux/types.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/filelock.h> #include <linux/nfs_fs.h> #include <linux/utsname.h> #include <linux/freezer.h> #include <linux/sunrpc/clnt.h> #include <linux/sunrpc/svc.h> #include "lockd.h" #include "trace.h" #define NLMDBG_FACILITY NLMDBG_CLIENT #define NLMCLNT_GRACE_WAIT (5*HZ) #define NLMCLNT_POLL_TIMEOUT (30*HZ) #define NLMCLNT_MAX_RETRIES 3 static int nlmclnt_test(struct nlm_rqst *, struct file_lock *); static int nlmclnt_lock(struct nlm_rqst *, struct file_lock *); static int nlmclnt_unlock(struct nlm_rqst *, struct file_lock *); static int nlm_stat_to_errno(__be32 stat); static void nlmclnt_locks_init_private(struct file_lock *fl, struct nlm_host *host); static int nlmclnt_cancel(struct nlm_host *, int , struct file_lock *); static const struct rpc_call_ops nlmclnt_unlock_ops; static const struct rpc_call_ops nlmclnt_cancel_ops; /* * Cookie counter for NLM requests */ static atomic_t nlm_cookie = ATOMIC_INIT(0x1234); void nlmclnt_next_cookie(struct lockd_cookie *c) { u32 cookie = atomic_inc_return(&nlm_cookie); memcpy(c->data, &cookie, 4); c->len=4; } static struct nlm_lockowner * nlmclnt_get_lockowner(struct nlm_lockowner *lockowner) { refcount_inc(&lockowner->count); return lockowner; } static void nlmclnt_put_lockowner(struct nlm_lockowner *lockowner) { if (!refcount_dec_and_lock(&lockowner->count, &lockowner->host->h_lock)) return; list_del(&lockowner->list); spin_unlock(&lockowner->host->h_lock); nlmclnt_release_host(lockowner->host); kfree(lockowner); } static inline int nlm_pidbusy(struct nlm_host *host, uint32_t pid) { struct nlm_lockowner *lockowner; list_for_each_entry(lockowner, &host->h_lockowners, list) { if (lockowner->pid == pid) return -EBUSY; } return 0; } static inline uint32_t __nlm_alloc_pid(struct nlm_host *host) { uint32_t res; do { res = host->h_pidcount++; } while (nlm_pidbusy(host, res) < 0); return res; } static struct nlm_lockowner *__nlmclnt_find_lockowner(struct nlm_host *host, fl_owner_t owner) { struct nlm_lockowner *lockowner; list_for_each_entry(lockowner, &host->h_lockowners, list) { if (lockowner->owner != owner) continue; return nlmclnt_get_lockowner(lockowner); } return NULL; } static struct nlm_lockowner *nlmclnt_find_lockowner(struct nlm_host *host, fl_owner_t owner) { struct nlm_lockowner *res, *new = NULL; spin_lock(&host->h_lock); res = __nlmclnt_find_lockowner(host, owner); if (res == NULL) { spin_unlock(&host->h_lock); new = kmalloc_obj(*new); spin_lock(&host->h_lock); res = __nlmclnt_find_lockowner(host, owner); if (res == NULL && new != NULL) { res = new; refcount_set(&new->count, 1); new->owner = owner; new->pid = __nlm_alloc_pid(host); new->host = nlm_get_host(host); list_add(&new->list, &host->h_lockowners); new = NULL; } } spin_unlock(&host->h_lock); kfree(new); return res; } /* * Initialize arguments for TEST/LOCK/UNLOCK/CANCEL calls */ static void nlmclnt_setlockargs(struct nlm_rqst *req, struct file_lock *fl) { struct lockd_args *argp = &req->a_args; struct lockd_lock *lock = &argp->lock; char *nodename = req->a_host->h_rpcclnt->cl_nodename; nlmclnt_next_cookie(&argp->cookie); memcpy(&lock->fh, NFS_FH(file_inode(fl->c.flc_file)), sizeof(struct nfs_fh)); lock->caller = nodename; lock->oh.data = req->a_owner; lock->oh.len = snprintf(req->a_owner, sizeof(req->a_owner), "%u@%s", (unsigned int)fl->fl_u.nfs_fl.owner->pid, nodename); lock->svid = fl->fl_u.nfs_fl.owner->pid; lock->fl.fl_start = fl->fl_start; lock->fl.fl_end = fl->fl_end; lock->fl.c.flc_type = fl->c.flc_type; } static void nlmclnt_release_lockargs(struct nlm_rqst *req) { WARN_ON_ONCE(req->a_args.lock.fl.fl_ops != NULL); } /** * nlmclnt_proc - Perform a single client-side lock request * @host: address of a valid nlm_host context representing the NLM server * @cmd: fcntl-style file lock operation to perform * @fl: address of arguments for the lock operation * @data: address of data to be sent to callback operations * */ int nlmclnt_proc(struct nlm_host *host, int cmd, struct file_lock *fl, void *data) { struct nlm_rqst *call; int status; const struct nlmclnt_operations *nlmclnt_ops = host->h_nlmclnt_ops; call = nlm_alloc_call(host); if (call == NULL) return -ENOMEM; if (nlmclnt_ops && nlmclnt_ops->nlmclnt_alloc_call) nlmclnt_ops->nlmclnt_alloc_call(data); nlmclnt_locks_init_private(fl, host); if (!fl->fl_u.nfs_fl.owner) { /* lockowner allocation has failed */ nlmclnt_release_call(call); return -ENOMEM; } /* Set up the argument struct */ nlmclnt_setlockargs(call, fl); call->a_callback_data = data; if (IS_SETLK(cmd) || IS_SETLKW(cmd)) { if (fl->c.flc_type != F_UNLCK) { call->a_args.block = IS_SETLKW(cmd) ? 1 : 0; status = nlmclnt_lock(call, fl); } else status = nlmclnt_unlock(call, fl); } else if (IS_GETLK(cmd)) status = nlmclnt_test(call, fl); else status = -EINVAL; fl->fl_ops->fl_release_private(fl); fl->fl_ops = NULL; dprintk("lockd: clnt proc returns %d\n", status); return status; } EXPORT_SYMBOL_GPL(nlmclnt_proc); /* * Allocate an NLM RPC call struct */ struct nlm_rqst *nlm_alloc_call(struct nlm_host *host) { struct nlm_rqst *call; for(;;) { call = kzalloc_obj(*call); if (call != NULL) { refcount_set(&call->a_count, 1); locks_init_lock(&call->a_args.lock.fl); locks_init_lock(&call->a_res.lock.fl); call->a_host = nlm_get_host(host); return call; } if (signalled()) break; printk("nlm_alloc_call: failed, waiting for memory\n"); schedule_timeout_interruptible(5*HZ); } return NULL; } void nlmclnt_release_call(struct nlm_rqst *call) { const struct nlmclnt_operations *nlmclnt_ops = call->a_host->h_nlmclnt_ops; if (!refcount_dec_and_test(&call->a_count)) return; if (nlmclnt_ops && nlmclnt_ops->nlmclnt_release_call) nlmclnt_ops->nlmclnt_release_call(call->a_callback_data); nlmclnt_release_host(call->a_host); nlmclnt_release_lockargs(call); kfree(call); } static void nlmclnt_rpc_release(void *data) { nlmclnt_release_call(data); } static int nlm_wait_on_grace(wait_queue_head_t *queue) { DEFINE_WAIT(wait); int status = -EINTR; prepare_to_wait(queue, &wait, TASK_INTERRUPTIBLE); if (!signalled ()) { schedule_timeout(NLMCLNT_GRACE_WAIT); try_to_freeze(); if (!signalled ()) status = 0; } finish_wait(queue, &wait); return status; } /* * Generic NLM call */ static int nlmclnt_call(const struct cred *cred, struct nlm_rqst *req, u32 proc) { struct nlm_host *host = req->a_host; struct rpc_clnt *clnt; struct lockd_args *argp = &req->a_args; struct lockd_res *resp = &req->a_res; struct rpc_message msg = { .rpc_argp = argp, .rpc_resp = resp, .rpc_cred = cred, }; int status; dprintk("lockd: call procedure %d on %s\n", (int)proc, host->h_name); do { if (host->h_reclaiming && !argp->reclaim) goto in_grace_period; /* If we have no RPC client yet, create one. */ if ((clnt = nlm_bind_host(host)) == NULL) return -ENOLCK; msg.rpc_proc = &clnt->cl_procinfo[proc]; /* Perform the RPC call. If an error occurs, try again */ if ((status = rpc_call_sync(clnt, &msg, 0)) < 0) { dprintk("lockd: rpc_call returned error %d\n", -status); switch (status) { case -EPROTONOSUPPORT: status = -EINVAL; break; case -ECONNREFUSED: case -ETIMEDOUT: case -ENOTCONN: nlm_rebind_host(host); status = -EAGAIN; break; case -ERESTARTSYS: return signalled () ? -EINTR : status; default: break; } break; } else if (resp->status == nlm_lck_denied_grace_period) { dprintk("lockd: server in grace period\n"); if (argp->reclaim) { printk(KERN_WARNING "lockd: spurious grace period reject?!\n"); return -ENOLCK; } } else { if (!argp->reclaim) { /* We appear to be out of the grace period */ wake_up_all(&host->h_gracewait); } dprintk("lockd: server returns status %d\n", ntohl(resp->status)); return 0; /* Okay, call complete */ } in_grace_period: /* * The server has rebooted and appears to be in the grace * period during which locks are only allowed to be * reclaimed. * We can only back off and try again later. */ status = nlm_wait_on_grace(&host->h_gracewait); } while (status == 0); return status; } /* * Generic NLM call, async version. */ static struct rpc_task *__nlm_async_call(struct nlm_rqst *req, u32 proc, struct rpc_message *msg, const struct rpc_call_ops *tk_ops) { struct nlm_host *host = req->a_host; struct rpc_clnt *clnt; struct rpc_task_setup task_setup_data = { .rpc_message = msg, .callback_ops = tk_ops, .callback_data = req, .flags = RPC_TASK_ASYNC, }; dprintk("lockd: call procedure %d on %s (async)\n", (int)proc, host->h_name); /* If we have no RPC client yet, create one. */ clnt = nlm_bind_host(host); if (clnt == NULL) goto out_err; msg->rpc_proc = &clnt->cl_procinfo[proc]; task_setup_data.rpc_client = clnt; /* bootstrap and kick off the async RPC call */ return rpc_run_task(&task_setup_data); out_err: tk_ops->rpc_release(req); return ERR_PTR(-ENOLCK); } static int nlm_do_async_call(struct nlm_rqst *req, u32 proc, struct rpc_message *msg, const struct rpc_call_ops *tk_ops) { struct rpc_task *task; task = __nlm_async_call(req, proc, msg, tk_ops); if (IS_ERR(task)) return PTR_ERR(task); rpc_put_task(task); return 0; } /* * NLM asynchronous call. */ int nlm_async_call(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops) { struct rpc_message msg = { .rpc_argp = &req->a_args, .rpc_resp = &req->a_res, }; return nlm_do_async_call(req, proc, &msg, tk_ops); } int nlm_async_reply(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops) { struct rpc_message msg = { .rpc_argp = &req->a_res, }; return nlm_do_async_call(req, proc, &msg, tk_ops); } /* * NLM client asynchronous call. * * Note that although the calls are asynchronous, and are therefore * guaranteed to complete, we still always attempt to wait for * completion in order to be able to correctly track the lock * state. */ static int nlmclnt_async_call(const struct cred *cred, struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops) { struct rpc_message msg = { .rpc_argp = &req->a_args, .rpc_resp = &req->a_res, .rpc_cred = cred, }; struct rpc_task *task; int err; task = __nlm_async_call(req, proc, &msg, tk_ops); if (IS_ERR(task)) return PTR_ERR(task); err = rpc_wait_for_completion_task(task); rpc_put_task(task); return err; } /* * TEST for the presence of a conflicting lock */ static int nlmclnt_test(struct nlm_rqst *req, struct file_lock *fl) { int status; status = nlmclnt_call(nfs_file_cred(fl->c.flc_file), req, NLMPROC_TEST); if (status < 0) goto out; switch (req->a_res.status) { case nlm_granted: fl->c.flc_type = F_UNLCK; break; case nlm_lck_denied: /* * Report the conflicting lock back to the application. */ fl->fl_start = req->a_res.lock.fl.fl_start; fl->fl_end = req->a_res.lock.fl.fl_end; fl->c.flc_type = req->a_res.lock.fl.c.flc_type; fl->c.flc_pid = -req->a_res.lock.fl.c.flc_pid; break; default: status = nlm_stat_to_errno(req->a_res.status); } out: trace_nlmclnt_test(&req->a_args.lock, (const struct sockaddr *)&req->a_host->h_addr, req->a_host->h_addrlen, req->a_res.status); nlmclnt_release_call(req); return status; } static void nlmclnt_locks_copy_lock(struct file_lock *new, struct file_lock *fl) { spin_lock(&fl->fl_u.nfs_fl.owner->host->h_lock); new->fl_u.nfs_fl.state = fl->fl_u.nfs_fl.state; new->fl_u.nfs_fl.owner = nlmclnt_get_lockowner(fl->fl_u.nfs_fl.owner); list_add_tail(&new->fl_u.nfs_fl.list, &fl->fl_u.nfs_fl.owner->host->h_granted); spin_unlock(&fl->fl_u.nfs_fl.owner->host->h_lock); } static void nlmclnt_locks_release_private(struct file_lock *fl) { spin_lock(&fl->fl_u.nfs_fl.owner->host->h_lock); list_del(&fl->fl_u.nfs_fl.list); spin_unlock(&fl->fl_u.nfs_fl.owner->host->h_lock); nlmclnt_put_lockowner(fl->fl_u.nfs_fl.owner); } static const struct file_lock_operations nlmclnt_lock_ops = { .fl_copy_lock = nlmclnt_locks_copy_lock, .fl_release_private = nlmclnt_locks_release_private, }; static void nlmclnt_locks_init_private(struct file_lock *fl, struct nlm_host *host) { fl->fl_u.nfs_fl.state = 0; fl->fl_ops = NULL; fl->fl_u.nfs_fl.owner = nlmclnt_find_lockowner(host, fl->c.flc_owner); INIT_LIST_HEAD(&fl->fl_u.nfs_fl.list); if (!fl->fl_u.nfs_fl.owner) return; fl->fl_ops = &nlmclnt_lock_ops; } static int do_vfs_lock(struct file_lock *fl) {