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.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, Whamcloud, Inc.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/obdclass/linux/linux-module.c
38 * Object Devices Class Driver
39 * These are the only exported functions, they provide some generic
40 * infrastructure for managing object devices
43 #define DEBUG_SUBSYSTEM S_CLASS
46 #include <linux/module.h>
47 #include <linux/errno.h>
48 #include <linux/kernel.h>
49 #include <linux/major.h>
50 #include <linux/sched.h>
52 #include <linux/slab.h>
53 #include <linux/ioport.h>
54 #include <linux/fcntl.h>
55 #include <linux/delay.h>
56 #include <linux/skbuff.h>
57 #include <linux/proc_fs.h>
59 #include <linux/poll.h>
60 #include <linux/init.h>
61 #include <linux/list.h>
62 #include <linux/highmem.h>
64 #include <asm/ioctls.h>
65 #include <asm/system.h>
67 #include <asm/uaccess.h>
68 #include <linux/miscdevice.h>
69 #include <linux/seq_file.h>
71 # include <liblustre.h>
74 #include <libcfs/libcfs.h>
75 #include <obd_support.h>
76 #include <obd_class.h>
77 #include <lnet/lnetctl.h>
78 #include <lprocfs_status.h>
79 #include <lustre_ver.h>
80 #include <lustre/lustre_build_version.h>
85 /* buffer MUST be at least the size of obd_ioctl_hdr */
86 int obd_ioctl_getdata(char **buf, int *len, void *arg)
88 struct obd_ioctl_hdr hdr;
89 struct obd_ioctl_data *data;
94 err = cfs_copy_from_user(&hdr, (void *)arg, sizeof(hdr));
98 if (hdr.ioc_version != OBD_IOCTL_VERSION) {
99 CERROR("Version mismatch kernel (%x) vs application (%x)\n",
100 OBD_IOCTL_VERSION, hdr.ioc_version);
104 if (hdr.ioc_len > OBD_MAX_IOCTL_BUFFER) {
105 CERROR("User buffer len %d exceeds %d max buffer\n",
106 hdr.ioc_len, OBD_MAX_IOCTL_BUFFER);
110 if (hdr.ioc_len < sizeof(struct obd_ioctl_data)) {
111 CERROR("User buffer too small for ioctl (%d)\n", hdr.ioc_len);
115 /* When there are lots of processes calling vmalloc on multi-core
116 * system, the high lock contention will hurt performance badly,
117 * obdfilter-survey is an example, which relies on ioctl. So we'd
118 * better avoid vmalloc on ioctl path. LU-66 */
119 OBD_ALLOC_LARGE(*buf, hdr.ioc_len);
121 CERROR("Cannot allocate control buffer of len %d\n",
126 data = (struct obd_ioctl_data *)*buf;
128 err = cfs_copy_from_user(*buf, (void *)arg, hdr.ioc_len);
130 OBD_FREE_LARGE(*buf, hdr.ioc_len);
134 if (obd_ioctl_is_invalid(data)) {
135 CERROR("ioctl not correctly formatted\n");
136 OBD_FREE_LARGE(*buf, hdr.ioc_len);
140 if (data->ioc_inllen1) {
141 data->ioc_inlbuf1 = &data->ioc_bulk[0];
142 offset += cfs_size_round(data->ioc_inllen1);
145 if (data->ioc_inllen2) {
146 data->ioc_inlbuf2 = &data->ioc_bulk[0] + offset;
147 offset += cfs_size_round(data->ioc_inllen2);
150 if (data->ioc_inllen3) {
151 data->ioc_inlbuf3 = &data->ioc_bulk[0] + offset;
152 offset += cfs_size_round(data->ioc_inllen3);
155 if (data->ioc_inllen4) {
156 data->ioc_inlbuf4 = &data->ioc_bulk[0] + offset;
163 int obd_ioctl_popdata(void *arg, void *data, int len)
167 err = cfs_copy_to_user(arg, data, len);
173 EXPORT_SYMBOL(obd_ioctl_getdata);
174 EXPORT_SYMBOL(obd_ioctl_popdata);
176 /* opening /dev/obd */
177 static int obd_class_open(struct inode * inode, struct file * file)
185 /* closing /dev/obd */
186 static int obd_class_release(struct inode * inode, struct file * file)
194 /* to control /dev/obd */
195 static long obd_class_ioctl(struct file *filp, unsigned int cmd,
201 /* Allow non-root access for OBD_IOC_PING_TARGET - used by lfs check */
202 if (!cfs_capable(CFS_CAP_SYS_ADMIN) && (cmd != OBD_IOC_PING_TARGET))
203 RETURN(err = -EACCES);
204 if ((cmd & 0xffffff00) == ((int)'T') << 8) /* ignore all tty ioctls */
205 RETURN(err = -ENOTTY);
207 err = class_handle_ioctl(cmd, (unsigned long)arg);
212 /* declare character device */
213 static struct file_operations obd_psdev_fops = {
214 .owner = THIS_MODULE,
215 .unlocked_ioctl = obd_class_ioctl, /* unlocked_ioctl */
216 .open = obd_class_open, /* open */
217 .release = obd_class_release, /* release */
221 cfs_psdev_t obd_psdev = {
222 .minor = OBD_DEV_MINOR,
223 .name = OBD_DEV_NAME,
224 .fops = &obd_psdev_fops,
230 int obd_proc_read_version(char *page, char **start, off_t off, int count,
231 int *eof, void *data)
234 return snprintf(page, count, "lustre: %s\nkernel: %s\nbuild: %s\n",
235 LUSTRE_VERSION_STRING, "patchless_client",
239 int obd_proc_read_pinger(char *page, char **start, off_t off, int count,
240 int *eof, void *data)
243 return snprintf(page, count, "%s\n",
253 * Check all obd devices health
261 * proc read function parameters, please refer to kernel
262 * code fs/proc/generic.c proc_file_read()
263 * \param data [in] unused
265 * \retval number of characters printed
267 static int obd_proc_read_health(char *page, char **start, off_t off,
268 int count, int *eof, void *data)
273 if (libcfs_catastrophe)
274 rc += snprintf(page + rc, count - rc, "LBUG\n");
276 cfs_read_lock(&obd_dev_lock);
277 for (i = 0; i < class_devno_max(); i++) {
278 struct obd_device *obd;
280 obd = class_num2obd(i);
281 if (obd == NULL || !obd->obd_attached || !obd->obd_set_up)
284 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
285 if (obd->obd_stopping)
288 class_incref(obd, __FUNCTION__, cfs_current());
289 cfs_read_unlock(&obd_dev_lock);
291 if (obd_health_check(NULL, obd)) {
292 rc += snprintf(page + rc, count - rc,
293 "device %s reported unhealthy\n",
296 class_decref(obd, __FUNCTION__, cfs_current());
297 cfs_read_lock(&obd_dev_lock);
299 cfs_read_unlock(&obd_dev_lock);
302 return snprintf(page, count, "healthy\n");
304 rc += snprintf(page + rc, count - rc, "NOT HEALTHY\n");
308 static int obd_proc_rd_jobid_var(char *page, char **start, off_t off,
309 int count, int *eof, void *data)
311 return snprintf(page, count, "%s\n", obd_jobid_var);
314 static int obd_proc_wr_jobid_var(struct file *file, const char *buffer,
315 unsigned long count, void *data)
317 if (!count || count > JOBSTATS_JOBID_VAR_MAX_LEN)
320 memset(obd_jobid_var, 0, JOBSTATS_JOBID_VAR_MAX_LEN + 1);
321 /* Trim the trailing '\n' if any */
322 memcpy(obd_jobid_var, buffer, count - (buffer[count - 1] == '\n'));
326 /* Root for /proc/fs/lustre */
327 struct proc_dir_entry *proc_lustre_root = NULL;
329 struct lprocfs_vars lprocfs_base[] = {
330 { "version", obd_proc_read_version, NULL, NULL },
331 { "pinger", obd_proc_read_pinger, NULL, NULL },
332 { "health_check", obd_proc_read_health, NULL, NULL },
333 { "jobid_var", obd_proc_rd_jobid_var,
334 obd_proc_wr_jobid_var, NULL },
338 #define lprocfs_base NULL
342 static void *obd_device_list_seq_start(struct seq_file *p, loff_t *pos)
344 if (*pos >= class_devno_max())
350 static void obd_device_list_seq_stop(struct seq_file *p, void *v)
354 static void *obd_device_list_seq_next(struct seq_file *p, void *v, loff_t *pos)
357 if (*pos >= class_devno_max())
363 static int obd_device_list_seq_show(struct seq_file *p, void *v)
365 loff_t index = *(loff_t *)v;
366 struct obd_device *obd = class_num2obd((int)index);
372 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
373 if (obd->obd_stopping)
375 else if (obd->obd_inactive)
377 else if (obd->obd_set_up)
379 else if (obd->obd_attached)
384 return seq_printf(p, "%3d %s %s %s %s %d\n",
385 (int)index, status, obd->obd_type->typ_name,
386 obd->obd_name, obd->obd_uuid.uuid,
387 cfs_atomic_read(&obd->obd_refcount));
390 struct seq_operations obd_device_list_sops = {
391 .start = obd_device_list_seq_start,
392 .stop = obd_device_list_seq_stop,
393 .next = obd_device_list_seq_next,
394 .show = obd_device_list_seq_show,
397 static int obd_device_list_open(struct inode *inode, struct file *file)
399 struct proc_dir_entry *dp = PDE(inode);
400 struct seq_file *seq;
401 int rc = seq_open(file, &obd_device_list_sops);
406 seq = file->private_data;
407 seq->private = dp->data;
412 struct file_operations obd_device_list_fops = {
413 .owner = THIS_MODULE,
414 .open = obd_device_list_open,
417 .release = seq_release,
421 int class_procfs_init(void)
428 proc_lustre_root = lprocfs_register("fs/lustre", NULL,
430 rc = lprocfs_seq_create(proc_lustre_root, "devices", 0444,
431 &obd_device_list_fops, NULL);
433 CERROR("error adding /proc/fs/lustre/devices file\n");
441 int class_procfs_clean(void)
444 if (proc_lustre_root) {
445 lprocfs_remove(&proc_lustre_root);