diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/obdclass/kernelcomm.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/obdclass/kernelcomm.c | 238 |
1 files changed, 0 insertions, 238 deletions
diff --git a/drivers/staging/lustre/lustre/obdclass/kernelcomm.c b/drivers/staging/lustre/lustre/obdclass/kernelcomm.c deleted file mode 100644 index b9bf81607bbf..000000000000 --- a/drivers/staging/lustre/lustre/obdclass/kernelcomm.c +++ /dev/null @@ -1,238 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * GPL HEADER START - * - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 only, - * as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License version 2 for more details (a copy is included - * in the LICENSE file that accompanied this code). - * - * You should have received a copy of the GNU General Public License - * version 2 along with this program; If not, see - * http://www.gnu.org/licenses/gpl-2.0.html - * - * GPL HEADER END - */ -/* - * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. - * Use is subject to license terms. - * - * Copyright (c) 2012, Intel Corporation. - */ -/* - * This file is part of Lustre, http://www.lustre.org/ - * Lustre is a trademark of Sun Microsystems, Inc. - * - * Author: Nathan Rutman <nathan.rutman@sun.com> - * - * Kernel <-> userspace communication routines. - * Using pipes for all arches. - */ - -#define DEBUG_SUBSYSTEM S_CLASS -#define D_KUC D_OTHER - -#include <obd_support.h> -#include <lustre_kernelcomm.h> - -/** - * libcfs_kkuc_msg_put - send an message from kernel to userspace - * @param fp to send the message to - * @param payload Payload data. First field of payload is always - * struct kuc_hdr - */ -int libcfs_kkuc_msg_put(struct file *filp, void *payload) -{ - struct kuc_hdr *kuch = (struct kuc_hdr *)payload; - ssize_t count = kuch->kuc_msglen; - loff_t offset = 0; - int rc = -ENXIO; - - if (IS_ERR_OR_NULL(filp)) - return -EBADF; - - if (kuch->kuc_magic != KUC_MAGIC) { - CERROR("KernelComm: bad magic %x\n", kuch->kuc_magic); - return rc; - } - - while (count > 0) { - rc = kernel_write(filp, payload, count, &offset); - if (rc < 0) - break; - count -= rc; - payload += rc; - rc = 0; - } - - if (rc < 0) - CWARN("message send failed (%d)\n", rc); - else - CDEBUG(D_KUC, "Sent message rc=%d, fp=%p\n", rc, filp); - - return rc; -} -EXPORT_SYMBOL(libcfs_kkuc_msg_put); - -/* - * Broadcast groups are global across all mounted filesystems; - * i.e. registering for a group on 1 fs will get messages for that - * group from any fs - */ -/** A single group registration has a uid and a file pointer */ -struct kkuc_reg { - struct list_head kr_chain; - int kr_uid; - struct file *kr_fp; - char kr_data[0]; -}; - -static struct list_head kkuc_groups[KUC_GRP_MAX + 1] = {}; -/* Protect message sending against remove and adds */ -static DECLARE_RWSEM(kg_sem); - -/** Add a receiver to a broadcast group - * @param filp pipe to write into - * @param uid identifier for this receiver - * @param group group number - * @param data user data - */ -int libcfs_kkuc_group_add(struct file *filp, int uid, unsigned int group, - void *data, size_t data_len) -{ - struct kkuc_reg *reg; - - if (group > KUC_GRP_MAX) { - CDEBUG(D_WARNING, "Kernelcomm: bad group %d\n", group); - return -EINVAL; - } - - /* fput in group_rem */ - if (!filp) - return -EBADF; - - /* freed in group_rem */ - reg = kmalloc(sizeof(*reg) + data_len, 0); - if (!reg) - return -ENOMEM; - - reg->kr_fp = filp; - reg->kr_uid = uid; - memcpy(reg->kr_data, data, data_len); - - down_write(&kg_sem); - if (!kkuc_groups[group].next) - INIT_LIST_HEAD(&kkuc_groups[group]); - list_add(®->kr_chain, &kkuc_groups[group]); - up_write(&kg_sem); - - CDEBUG(D_KUC, "Added uid=%d fp=%p to group %d\n", uid, filp, group); - - return 0; -} -EXPORT_SYMBOL(libcfs_kkuc_group_add); - -int libcfs_kkuc_group_rem(int uid, unsigned int group) -{ - struct kkuc_reg *reg, *next; - - if (!kkuc_groups[group].next) - return 0; - - if (!uid) { - /* Broadcast a shutdown message */ - struct kuc_hdr lh; - - lh.kuc_magic = KUC_MAGIC; - lh.kuc_transport = KUC_TRANSPORT_GENERIC; - lh.kuc_msgtype = KUC_MSG_SHUTDOWN; - lh.kuc_msglen = sizeof(lh); - libcfs_kkuc_group_put(group, &lh); - } - - down_write(&kg_sem); - list_for_each_entry_safe(reg, next, &kkuc_groups[group], kr_chain) { - if (!uid || (uid == reg->kr_uid)) { - list_del(®->kr_chain); - CDEBUG(D_KUC, "Removed uid=%d fp=%p from group %d\n", - reg->kr_uid, reg->kr_fp, group); - if (reg->kr_fp) - fput(reg->kr_fp); - kfree(reg); - } - } - up_write(&kg_sem); - - return 0; -} -EXPORT_SYMBOL(libcfs_kkuc_group_rem); - -int libcfs_kkuc_group_put(unsigned int group, void *payload) -{ - struct kkuc_reg *reg; - int rc = 0; - int one_success = 0; - - down_write(&kg_sem); - list_for_each_entry(reg, &kkuc_groups[group], kr_chain) { - if (reg->kr_fp) { - rc = libcfs_kkuc_msg_put(reg->kr_fp, payload); - if (!rc) { - one_success = 1; - } else if (rc == -EPIPE) { - fput(reg->kr_fp); - reg->kr_fp = NULL; - } - } - } - up_write(&kg_sem); - - /* - * don't return an error if the message has been delivered - * at least to one agent - */ - if (one_success) - rc = 0; - - return rc; -} -EXPORT_SYMBOL(libcfs_kkuc_group_put); - -/** - * Calls a callback function for each link of the given kuc group. - * @param group the group to call the function on. - * @param cb_func the function to be called. - * @param cb_arg extra argument to be passed to the callback function. - */ -int libcfs_kkuc_group_foreach(unsigned int group, libcfs_kkuc_cb_t cb_func, - void *cb_arg) -{ - struct kkuc_reg *reg; - int rc = 0; - - if (group > KUC_GRP_MAX) { - CDEBUG(D_WARNING, "Kernelcomm: bad group %d\n", group); - return -EINVAL; - } - - /* no link for this group */ - if (!kkuc_groups[group].next) - return 0; - - down_read(&kg_sem); - list_for_each_entry(reg, &kkuc_groups[group], kr_chain) { - if (reg->kr_fp) - rc = cb_func(reg->kr_data, cb_arg); - } - up_read(&kg_sem); - - return rc; -} -EXPORT_SYMBOL(libcfs_kkuc_group_foreach); |