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linux
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fs
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orangefs
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waitqueue.c
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// SPDX-License-Identifier: GPL-2.0 /* * (C) 2001 Clemson University and The University of Chicago * (C) 2011 Omnibond Systems * * Changes by Acxiom Corporation to implement generic service_operation() * function, Copyright Acxiom Corporation, 2005. * * See COPYING in top-level directory. */ /* * In-kernel waitqueue operations. */ #include "protocol.h" #include "orangefs-kernel.h" #include "orangefs-bufmap.h" static int wait_for_matching_downcall(struct orangefs_kernel_op_s *op, long timeout, bool interruptible) __acquires(op->lock); static void orangefs_clean_up_interrupted_operation(struct orangefs_kernel_op_s *op) __releases(op->lock); /* * What we do in this function is to walk the list of operations that are * present in the request queue and mark them as purged. * NOTE: This is called from the device close after client-core has * guaranteed that no new operations could appear on the list since the * client-core is anyway going to exit. */ void purge_waiting_ops(void) { struct orangefs_kernel_op_s *op, *tmp; spin_lock(&orangefs_request_list_lock); list_for_each_entry_safe(op, tmp, &orangefs_request_list, list) { gossip_debug(GOSSIP_WAIT_DEBUG, "pvfs2-client-core: purging op tag %llu %s\n", llu(op->tag), get_opname_string(op)); set_op_state_purged(op); gossip_debug(GOSSIP_DEV_DEBUG, "%s: op:%s: op_state:%d: process:%s:\n", __func__, get_opname_string(op), op->op_state, current->comm); } spin_unlock(&orangefs_request_list_lock); } /* * submits a ORANGEFS operation and waits for it to complete * * Note op->downcall.status will contain the status of the operation (in * errno format), whether provided by pvfs2-client or a result of failure to * service the operation. If the caller wishes to distinguish, then * op->state can be checked to see if it was serviced or not. * * Returns contents of op->downcall.status for convenience */ int service_operation(struct orangefs_kernel_op_s *op, const char *op_name, int flags) { long timeout = MAX_SCHEDULE_TIMEOUT; int ret = 0; DEFINE_WAIT(wait_entry); op->upcall.tgid = current->tgid; op->upcall.pid = current->pid; retry_servicing: op->downcall.status = 0; gossip_debug(GOSSIP_WAIT_DEBUG, "%s: %s op:%p: process:%s: pid:%d:\n", __func__, op_name, op, current->comm, current->pid); /* * If ORANGEFS_OP_NO_MUTEX was set in flags, we need to avoid * acquiring the request_mutex because we're servicing a * high priority remount operation and the request_mutex is * already taken. */ if (!(flags & ORANGEFS_OP_NO_MUTEX)) { if (flags & ORANGEFS_OP_INTERRUPTIBLE) ret = mutex_lock_interruptible(&orangefs_request_mutex); else ret = mutex_lock_killable(&orangefs_request_mutex); /* * check to see if we were interrupted while waiting for * mutex */ if (ret < 0) { op->downcall.status = ret; gossip_debug(GOSSIP_WAIT_DEBUG, "%s: service_operation interrupted.\n", __func__); return ret; } } /* queue up the operation */ spin_lock(&orangefs_request_list_lock); spin_lock(&op->lock); set_op_state_waiting(op); gossip_debug(GOSSIP_DEV_DEBUG, "%s: op:%s: op_state:%d: process:%s:\n", __func__, get_opname_string(op), op->op_state, current->comm); /* add high priority remount op to the front of the line. */ if (flags & ORANGEFS_OP_PRIORITY) list_add(&op->list, &orangefs_request_list); else list_add_tail(&op->list, &orangefs_request_list); spin_unlock(&op->lock); wake_up_interruptible(&orangefs_request_list_waitq); if (!__is_daemon_in_service()) { gossip_debug(GOSSIP_WAIT_DEBUG, "%s:client core is NOT in service.\n", __func__); /* * Don't wait for the userspace component to return if * the filesystem is being umounted anyway. */ if (op->upcall.type == ORANGEFS_VFS_OP_FS_UMOUNT) timeout = 0; else timeout = op_timeout_secs * HZ; } spin_unlock(&orangefs_request_list_lock); if (!(flags & ORANGEFS_OP_NO_MUTEX)) mutex_unlock(&orangefs_request_mutex); ret = wait_for_matching_downcall(op, timeout, flags & ORANGEFS_OP_INTERRUPTIBLE); gossip_debug(GOSSIP_WAIT_DEBUG, "%s: wait_for_matching_downcall returned %d for %p\n", __func__, ret, op); /* got matching downcall; make sure status is in errno format */ if (!ret) { spin_unlock(&op->lock); op->downcall.status = orangefs_normalize_to_errno(op->downcall.status); ret = op->downcall.status; goto out; } /* failed to get matching downcall */ if (ret == -ETIMEDOUT) { gossip_err("%s: %s -- wait timed out; aborting attempt.\n", __func__, op_name); } /* * remove a waiting op from the request list or * remove an in-progress op from the in-progress list. */ orangefs_clean_up_interrupted_operation(op); op->downcall.status = ret; /* retry if operation has not been serviced and if requested */ if (ret == -EAGAIN) { op->attempts++; timeout = op_timeout_secs * HZ; gossip_debug(GOSSIP_WAIT_DEBUG, "orangefs: tag %llu (%s)" " -- operation to be retried (%d attempt)\n", llu(op->tag), op_name, op->attempts); /* * io ops (ops that use the shared memory buffer) have * to be returned to their caller for a retry. Other ops * can just be recycled here. */ if (!op->uses_shared_memory) goto retry_servicing; } out: gossip_debug(GOSSIP_WAIT_DEBUG, "%s: %s returning: %d for %p.\n", __func__, op_name, ret, op); return ret; } /* This can get called on an I/O op if it had a bad service_operation. */ bool orangefs_cancel_op_in_progress(struct orangefs_kernel_op_s *op) { u64 tag = op->tag; if (!op_state_in_progress(op)) return false; op->slot_to_free = op->upcall.req.io.buf_index; memset(&op->upcall, 0, sizeof(op->upcall)); memset(&op->downcall, 0, sizeof(op->downcall)); op->upcall.type = ORANGEFS_VFS_OP_CANCEL; op->upcall.req.cancel.op_tag = tag; op->downcall.type = ORANGEFS_VFS_OP_INVALID; op->downcall.status = -1; orangefs_new_tag(op); spin_lock(&orangefs_request_list_lock); /* orangefs_request_list_lock is enough of a barrier here */ if (!__is_daemon_in_service()) { spin_unlock(&orangefs_request_list_lock); return false; } spin_lock(&op->lock); set_op_state_waiting(op); gossip_debug(GOSSIP_DEV_DEBUG, "%s: op:%s: op_state:%d: process:%s:\n", __func__, get_opname_string(op), op->op_state, current->comm); list_add(&op->list, &orangefs_request_list); spin_unlock(&op->lock); spin_unlock(&orangefs_request_list_lock); gossip_debug(GOSSIP_WAIT_DEBUG, "Attempting ORANGEFS operation cancellation of tag %llu\n", llu(tag)); return true; } /* * Change an op to the "given up" state and remove it from its list. */ static void orangefs_clean_up_interrupted_operation(struct orangefs_kernel_op_s *op) __releases(op->lock) { /* * handle interrupted cases depending on what state we were in when * the interruption is detected. * * Called with op->lock held. */ /* * List manipulation code elsewhere will ignore ops that * have been given up upon. */ op->op_state |= OP_VFS_STATE_GIVEN_UP; if (list_empty(&op->list)) { /* caught copying to/from daemon */ BUG_ON(op_state_serviced(op)); spin_unlock(&op->lock); wait_for_completion(&op->waitq); } else if (op_state_waiting(op)) { /* * upcall hasn't been read; remove op from upcall request * list. */ spin_unlock(&op->lock); spin_lock(&orangefs_request_list_lock); list_del_init(&op->list); spin_unlock(&orangefs_request_list_lock); gossip_debug(GOSSIP_WAIT_DEBUG, "Interrupted: Removed op %p from request_list\n", op); } else if (op_state_in_progress(op)) { /* op must be removed from the in progress htable */ spin_unlock(&op->lock); spin_lock(&orangefs_htable_ops_in_progress_lock); list_del_init(&op->list); spin_unlock(&orangefs_htable_ops_in_progress_lock); gossip_debug(GOSSIP_WAIT_DEBUG, "Interrupted: Removed op %p" " from htable_ops_in_progress\n", op); } else { spin_unlock(&op->lock); gossip_err("interrupted operation is in a weird state 0x%x\n", op->op_state); } reinit_completion(&op->waitq); } /* * Sleeps on waitqueue waiting for matching downcall. * If client-core finishes servicing, then we are good to go. * else if client-core exits, we get woken up here, and retry with a timeout * * When this call returns to the caller, the specified op will no * longer be in either the in_progress hash table or on the request list. * * Returns 0 on success and -errno on failure * Errors are: * EAGAIN in case we want the caller to requeue and try again.. * EINTR/EIO/ETIMEDOUT indicating we are done trying to service this * operation since client-core seems to be exiting too often * or if we were interrupted. * * Returns with op->lock taken. */ static int wait_for_matching_downcall(struct orangefs_kernel_op_s *op, long timeout, bool interruptible) __acquires(op->lock) { long n; /* * There's a "schedule_timeout" inside of these wait * primitives, during which the op is out of the hands of the * user process that needs something done and is being * manipulated by the client-core process. */ if (interruptible) n = wait_for_completion_interruptible_timeout(&op->waitq, timeout); else n = wait_for_completion_killable_timeout(&op->waitq, timeout); spin_lock(&op->lock); if (op_state_serviced(op)) return 0; if (unlikely(n < 0)) { gossip_debug(GOSSIP_WAIT_DEBUG, "%s: operation interrupted, tag %llu, %p\n", __func__, llu(op->tag), op); return -EINTR; } if (op_state_purged(op)) { gossip_debug(GOSSIP_WAIT_DEBUG, "%s: operation purged, tag %llu, %p, %d\n", __func__, llu(op->tag), op, op->attempts); return (op->attempts < ORANGEFS_PURGE_RETRY_COUNT) ? -EAGAIN : -EIO; } /* must have timed out, then... */ gossip_debug(GOSSIP_WAIT_DEBUG, "%s: operation timed out, tag %llu, %p, %d)\n", __func__, llu(op->tag), op, op->attempts); return -ETIMEDOUT; }
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