4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2012, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lustre/obdclass/linux/linux-module.c
34 * Object Devices Class Driver
35 * These are the only exported functions, they provide some generic
36 * infrastructure for managing object devices
39 #define DEBUG_SUBSYSTEM S_CLASS
41 #include <linux/module.h>
42 #include <linux/errno.h>
43 #include <linux/kernel.h>
44 #include <linux/major.h>
45 #include <linux/sched.h>
47 #include <linux/slab.h>
48 #include <linux/ioport.h>
49 #include <linux/fcntl.h>
50 #include <linux/delay.h>
51 #include <linux/skbuff.h>
53 #include <linux/poll.h>
54 #include <linux/list.h>
55 #include <linux/highmem.h>
57 #include <asm/ioctls.h>
58 #include <linux/uaccess.h>
59 #include <linux/miscdevice.h>
60 #include <linux/seq_file.h>
61 #include <linux/kobject.h>
63 #include "../../../include/linux/libcfs/libcfs.h"
64 #include "../../../include/linux/lnet/lnetctl.h"
65 #include "../../include/obd_support.h"
66 #include "../../include/obd_class.h"
67 #include "../../include/lprocfs_status.h"
68 #include "../../include/lustre/lustre_ioctl.h"
69 #include "../../include/lustre_ver.h"
71 /* buffer MUST be at least the size of obd_ioctl_hdr */
72 int obd_ioctl_getdata(char **buf, int *len, void __user *arg)
74 struct obd_ioctl_hdr hdr;
75 struct obd_ioctl_data *data;
79 if (copy_from_user(&hdr, arg, sizeof(hdr)))
82 if (hdr.ioc_version != OBD_IOCTL_VERSION) {
83 CERROR("Version mismatch kernel (%x) vs application (%x)\n",
84 OBD_IOCTL_VERSION, hdr.ioc_version);
88 if (hdr.ioc_len > OBD_MAX_IOCTL_BUFFER) {
89 CERROR("User buffer len %d exceeds %d max buffer\n",
90 hdr.ioc_len, OBD_MAX_IOCTL_BUFFER);
94 if (hdr.ioc_len < sizeof(struct obd_ioctl_data)) {
95 CERROR("User buffer too small for ioctl (%d)\n", hdr.ioc_len);
99 /* When there are lots of processes calling vmalloc on multi-core
100 * system, the high lock contention will hurt performance badly,
101 * obdfilter-survey is an example, which relies on ioctl. So we'd
102 * better avoid vmalloc on ioctl path. LU-66
104 *buf = libcfs_kvzalloc(hdr.ioc_len, GFP_NOFS);
106 CERROR("Cannot allocate control buffer of len %d\n",
111 data = (struct obd_ioctl_data *)*buf;
113 if (copy_from_user(*buf, arg, hdr.ioc_len)) {
117 if (hdr.ioc_len != data->ioc_len) {
122 if (obd_ioctl_is_invalid(data)) {
123 CERROR("ioctl not correctly formatted\n");
128 if (data->ioc_inllen1) {
129 data->ioc_inlbuf1 = &data->ioc_bulk[0];
130 offset += cfs_size_round(data->ioc_inllen1);
133 if (data->ioc_inllen2) {
134 data->ioc_inlbuf2 = &data->ioc_bulk[0] + offset;
135 offset += cfs_size_round(data->ioc_inllen2);
138 if (data->ioc_inllen3) {
139 data->ioc_inlbuf3 = &data->ioc_bulk[0] + offset;
140 offset += cfs_size_round(data->ioc_inllen3);
143 if (data->ioc_inllen4)
144 data->ioc_inlbuf4 = &data->ioc_bulk[0] + offset;
152 EXPORT_SYMBOL(obd_ioctl_getdata);
154 /* opening /dev/obd */
155 static int obd_class_open(struct inode *inode, struct file *file)
157 try_module_get(THIS_MODULE);
161 /* closing /dev/obd */
162 static int obd_class_release(struct inode *inode, struct file *file)
164 module_put(THIS_MODULE);
168 /* to control /dev/obd */
169 static long obd_class_ioctl(struct file *filp, unsigned int cmd,
174 /* Allow non-root access for OBD_IOC_PING_TARGET - used by lfs check */
175 if (!capable(CFS_CAP_SYS_ADMIN) && (cmd != OBD_IOC_PING_TARGET))
176 return err = -EACCES;
177 if ((cmd & 0xffffff00) == ((int)'T') << 8) /* ignore all tty ioctls */
178 return err = -ENOTTY;
180 err = class_handle_ioctl(cmd, (unsigned long)arg);
185 /* declare character device */
186 static const struct file_operations obd_psdev_fops = {
187 .owner = THIS_MODULE,
188 .unlocked_ioctl = obd_class_ioctl, /* unlocked_ioctl */
189 .open = obd_class_open, /* open */
190 .release = obd_class_release, /* release */
194 struct miscdevice obd_psdev = {
195 .minor = OBD_DEV_MINOR,
196 .name = OBD_DEV_NAME,
197 .fops = &obd_psdev_fops,
200 static ssize_t version_show(struct kobject *kobj, struct attribute *attr,
203 return sprintf(buf, "%s\n", LUSTRE_VERSION_STRING);
206 static ssize_t pinger_show(struct kobject *kobj, struct attribute *attr,
209 return sprintf(buf, "%s\n", "on");
213 health_check_show(struct kobject *kobj, struct attribute *attr, char *buf)
219 if (libcfs_catastrophe)
220 return sprintf(buf, "LBUG\n");
222 read_lock(&obd_dev_lock);
223 for (i = 0; i < class_devno_max(); i++) {
224 struct obd_device *obd;
226 obd = class_num2obd(i);
227 if (!obd || !obd->obd_attached || !obd->obd_set_up)
230 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
231 if (obd->obd_stopping)
234 class_incref(obd, __func__, current);
235 read_unlock(&obd_dev_lock);
237 if (obd_health_check(NULL, obd))
239 class_decref(obd, __func__, current);
240 read_lock(&obd_dev_lock);
242 read_unlock(&obd_dev_lock);
245 len = sprintf(buf, "healthy\n");
247 len = sprintf(buf, "NOT HEALTHY\n");
252 static ssize_t jobid_var_show(struct kobject *kobj, struct attribute *attr,
255 return snprintf(buf, PAGE_SIZE, "%s\n", obd_jobid_var);
258 static ssize_t jobid_var_store(struct kobject *kobj, struct attribute *attr,
262 if (!count || count > JOBSTATS_JOBID_VAR_MAX_LEN)
265 memset(obd_jobid_var, 0, JOBSTATS_JOBID_VAR_MAX_LEN + 1);
267 memcpy(obd_jobid_var, buffer, count);
269 /* Trim the trailing '\n' if any */
270 if (obd_jobid_var[count - 1] == '\n')
271 obd_jobid_var[count - 1] = 0;
276 static ssize_t jobid_name_show(struct kobject *kobj, struct attribute *attr,
279 return snprintf(buf, PAGE_SIZE, "%s\n", obd_jobid_node);
282 static ssize_t jobid_name_store(struct kobject *kobj, struct attribute *attr,
286 if (!count || count > LUSTRE_JOBID_SIZE)
289 memcpy(obd_jobid_node, buffer, count);
291 obd_jobid_node[count] = 0;
293 /* Trim the trailing '\n' if any */
294 if (obd_jobid_node[count - 1] == '\n')
295 obd_jobid_node[count - 1] = 0;
300 /* Root for /sys/kernel/debug/lustre */
301 struct dentry *debugfs_lustre_root;
302 EXPORT_SYMBOL_GPL(debugfs_lustre_root);
304 LUSTRE_RO_ATTR(version);
305 LUSTRE_RO_ATTR(pinger);
306 LUSTRE_RO_ATTR(health_check);
307 LUSTRE_RW_ATTR(jobid_var);
308 LUSTRE_RW_ATTR(jobid_name);
310 static struct attribute *lustre_attrs[] = {
311 &lustre_attr_version.attr,
312 &lustre_attr_pinger.attr,
313 &lustre_attr_health_check.attr,
314 &lustre_attr_jobid_name.attr,
315 &lustre_attr_jobid_var.attr,
319 static void *obd_device_list_seq_start(struct seq_file *p, loff_t *pos)
321 if (*pos >= class_devno_max())
327 static void obd_device_list_seq_stop(struct seq_file *p, void *v)
331 static void *obd_device_list_seq_next(struct seq_file *p, void *v, loff_t *pos)
334 if (*pos >= class_devno_max())
340 static int obd_device_list_seq_show(struct seq_file *p, void *v)
342 loff_t index = *(loff_t *)v;
343 struct obd_device *obd = class_num2obd((int)index);
349 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
350 if (obd->obd_stopping)
352 else if (obd->obd_inactive)
354 else if (obd->obd_set_up)
356 else if (obd->obd_attached)
361 seq_printf(p, "%3d %s %s %s %s %d\n",
362 (int)index, status, obd->obd_type->typ_name,
363 obd->obd_name, obd->obd_uuid.uuid,
364 atomic_read(&obd->obd_refcount));
368 static const struct seq_operations obd_device_list_sops = {
369 .start = obd_device_list_seq_start,
370 .stop = obd_device_list_seq_stop,
371 .next = obd_device_list_seq_next,
372 .show = obd_device_list_seq_show,
375 static int obd_device_list_open(struct inode *inode, struct file *file)
377 struct seq_file *seq;
378 int rc = seq_open(file, &obd_device_list_sops);
383 seq = file->private_data;
384 seq->private = inode->i_private;
389 static const struct file_operations obd_device_list_fops = {
390 .owner = THIS_MODULE,
391 .open = obd_device_list_open,
394 .release = seq_release,
397 struct kobject *lustre_kobj;
398 EXPORT_SYMBOL_GPL(lustre_kobj);
400 static const struct attribute_group lustre_attr_group = {
401 .attrs = lustre_attrs,
404 int class_procfs_init(void)
409 lustre_kobj = kobject_create_and_add("lustre", fs_kobj);
413 /* Create the files associated with this kobject */
414 rc = sysfs_create_group(lustre_kobj, &lustre_attr_group);
416 kobject_put(lustre_kobj);
420 debugfs_lustre_root = debugfs_create_dir("lustre", NULL);
421 if (IS_ERR_OR_NULL(debugfs_lustre_root)) {
422 rc = debugfs_lustre_root ? PTR_ERR(debugfs_lustre_root)
424 debugfs_lustre_root = NULL;
425 kobject_put(lustre_kobj);
429 file = debugfs_create_file("devices", 0444, debugfs_lustre_root, NULL,
430 &obd_device_list_fops);
431 if (IS_ERR_OR_NULL(file)) {
432 rc = file ? PTR_ERR(file) : -ENOMEM;
433 kobject_put(lustre_kobj);
440 int class_procfs_clean(void)
442 debugfs_remove_recursive(debugfs_lustre_root);
444 debugfs_lustre_root = NULL;
446 kobject_put(lustre_kobj);