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Initial Linux ZFS GIT Repo
This commit is contained in:
Brian Behlendorf
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subdir-m += sys
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DISTFILES = dmu_ctl.h dmu_ctl_impl.h
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#ifndef _SYS_DMU_CTL_H
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#define _SYS_DMU_CTL_H
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#include <sys/types.h>
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/* Default directory where the clients search for sockets to connect */
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#define DMU_CTL_DEFAULT_DIR "/var/run/zfs/udmu"
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/*
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* These functions are called by the server process.
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*
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* kernel_init() must be called before dctl_server_init().
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* kernel_fini() must not be called before dctl_server_fini().
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*
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* All objsets must be closed and object references be released before calling
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* dctl_server_fini(), otherwise it will return EBUSY.
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*
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* Note: On Solaris, it is highly recommended to either catch or ignore the
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* SIGPIPE signal, otherwise the server process will die if the client is
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* killed.
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*/
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int dctl_server_init(const char *cfg_dir, int min_threads,
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int max_free_threads);
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int dctl_server_fini();
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/*
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* The following functions are called by the DMU from the server process context
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* (in the worker threads).
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*/
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int dctls_copyin(const void *src, void *dest, size_t size);
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int dctls_copyinstr(const char *from, char *to, size_t max,
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size_t *len);
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int dctls_copyout(const void *src, void *dest, size_t size);
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int dctls_fd_read(int fd, void *buf, ssize_t len, ssize_t *residp);
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int dctls_fd_write(int fd, const void *src, ssize_t len);
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/*
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* These functions are called by the client process (libzfs).
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*/
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int dctlc_connect(const char *dir, boolean_t check_subdirs);
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void dctlc_disconnect(int fd);
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int dctlc_ioctl(int fd, int32_t request, void *arg);
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#endif
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@@ -0,0 +1,144 @@
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#ifndef _SYS_DMU_CTL_IMPL_H
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#define _SYS_DMU_CTL_IMPL_H
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#include <sys/list.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <pthread.h>
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#define SOCKNAME "dmu_socket"
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#define DCTL_PROTOCOL_VER 1
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#define DCTL_MAGIC 0xdc71b1070c01dc71ll
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/* Message types */
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enum {
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DCTL_IOCTL,
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DCTL_IOCTL_REPLY,
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DCTL_COPYIN,
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DCTL_COPYINSTR,
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DCTL_COPYOUT,
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DCTL_FD_READ,
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DCTL_FD_WRITE,
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DCTL_GEN_REPLY /* generic reply */
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};
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/* On-the-wire message */
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typedef struct dctl_cmd {
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uint64_t dcmd_magic;
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int8_t dcmd_version;
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int8_t dcmd_msg;
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uint8_t dcmd_pad[6];
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union {
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struct dcmd_ioctl {
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uint64_t arg;
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int32_t cmd;
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uint8_t pad[4];
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} dcmd_ioctl;
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struct dcmd_copy_req {
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uint64_t ptr;
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uint64_t size;
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} dcmd_copy;
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struct dcmd_fd_req {
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int64_t size;
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int32_t fd;
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uint8_t pad[4];
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} dcmd_fd_io;
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struct dcmd_reply {
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uint64_t size; /* used by reply to DCTL_COPYINSTR,
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DCTL_FD_READ and DCTL_FD_WRITE */
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int32_t rc; /* return code */
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uint8_t pad[4];
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} dcmd_reply;
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} u;
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} dctl_cmd_t;
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#define DCTL_CMD_HEADER_SIZE (sizeof(uint64_t) + sizeof(uint8_t))
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/*
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* The following definitions are only used by the server code.
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*/
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#define LISTEN_BACKLOG 5
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/* Worker thread data */
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typedef struct wthr_info {
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list_node_t wthr_node;
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pthread_t wthr_id;
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boolean_t wthr_exit; /* termination flag */
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boolean_t wthr_free;
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} wthr_info_t;
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/* Control socket data */
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typedef struct dctl_sock_info {
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pthread_mutex_t dsi_mtx;
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char *dsi_path;
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struct sockaddr_un dsi_addr;
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int dsi_fd;
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} dctl_sock_info_t;
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typedef void *thr_func_t(void *);
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/* Thread pool data */
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typedef struct dctl_thr_info {
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thr_func_t *dti_thr_func;
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pthread_mutex_t dti_mtx; /* protects the thread lists and dti_free */
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list_t dti_list; /* list of threads in the thread pool */
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list_t dti_join_list; /* list of threads that are waiting to be
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joined */
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int dti_free; /* number of free worker threads */
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int dti_min;
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int dti_max_free;
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boolean_t dti_exit; /* global termination flag */
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} dctl_thr_info_t;
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/* Messaging functions functions */
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int dctl_read_msg(int fd, dctl_cmd_t *cmd);
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int dctl_send_msg(int fd, dctl_cmd_t *cmd);
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int dctl_read_data(int fd, void *ptr, size_t size);
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int dctl_send_data(int fd, const void *ptr, size_t size);
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/* Thread pool functions */
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int dctl_thr_pool_create(int min_thr, int max_free_thr,
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thr_func_t *thr_func);
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void dctl_thr_pool_stop();
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void dctl_thr_join();
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void dctl_thr_die(wthr_info_t *thr);
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void dctl_thr_rebalance(wthr_info_t *thr, boolean_t set_free);
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#endif
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