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) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
33 #define DEBUG_SUBSYSTEM S_CLASS
35 #include <linux/miscdevice.h>
36 #include <linux/user_namespace.h>
37 #include <linux/uidgid.h>
38 #include <linux/atomic.h>
39 #include <linux/list.h>
41 #include <obd_support.h>
42 #include <obd_class.h>
43 #include <uapi/linux/lnet/lnetctl.h>
44 #include <lustre_debug.h>
45 #include <lustre_kernelcomm.h>
46 #include <lprocfs_status.h>
47 #include <cl_object.h>
48 #ifdef HAVE_SERVER_SUPPORT
49 # include <dt_object.h>
50 # include <md_object.h>
51 #endif /* HAVE_SERVER_SUPPORT */
52 #include <uapi/linux/lustre/lustre_ioctl.h>
53 #include "llog_internal.h"
56 static __u64 obd_max_alloc;
61 static DEFINE_SPINLOCK(obd_updatemax_lock);
63 /* The following are visible and mutable through /proc/sys/lustre/. */
64 unsigned int obd_debug_peer_on_timeout;
65 EXPORT_SYMBOL(obd_debug_peer_on_timeout);
66 unsigned int obd_dump_on_timeout;
67 EXPORT_SYMBOL(obd_dump_on_timeout);
68 unsigned int obd_dump_on_eviction;
69 EXPORT_SYMBOL(obd_dump_on_eviction);
70 unsigned int obd_lbug_on_eviction;
71 EXPORT_SYMBOL(obd_lbug_on_eviction);
72 unsigned long obd_max_dirty_pages;
73 EXPORT_SYMBOL(obd_max_dirty_pages);
74 atomic_long_t obd_dirty_pages;
75 EXPORT_SYMBOL(obd_dirty_pages);
76 unsigned int obd_timeout = OBD_TIMEOUT_DEFAULT; /* seconds */
77 EXPORT_SYMBOL(obd_timeout);
78 unsigned int ldlm_timeout = LDLM_TIMEOUT_DEFAULT; /* seconds */
79 EXPORT_SYMBOL(ldlm_timeout);
80 unsigned int obd_timeout_set;
81 EXPORT_SYMBOL(obd_timeout_set);
82 unsigned int ldlm_timeout_set;
83 EXPORT_SYMBOL(ldlm_timeout_set);
84 /* bulk transfer timeout, give up after 100s by default */
85 unsigned int bulk_timeout = 100; /* seconds */
86 EXPORT_SYMBOL(bulk_timeout);
87 /* Adaptive timeout defs here instead of ptlrpc module for /proc/sys/ access */
88 unsigned int at_min = 0;
89 EXPORT_SYMBOL(at_min);
90 unsigned int at_max = 600;
91 EXPORT_SYMBOL(at_max);
92 unsigned int at_history = 600;
93 EXPORT_SYMBOL(at_history);
94 int at_early_margin = 5;
95 EXPORT_SYMBOL(at_early_margin);
97 EXPORT_SYMBOL(at_extra);
100 struct lprocfs_stats *obd_memory = NULL;
101 EXPORT_SYMBOL(obd_memory);
104 static int class_resolve_dev_name(__u32 len, const char *name)
111 CERROR("No name passed,!\n");
112 GOTO(out, rc = -EINVAL);
114 if (name[len - 1] != 0) {
115 CERROR("Name not nul terminated!\n");
116 GOTO(out, rc = -EINVAL);
119 CDEBUG(D_IOCTL, "device name %s\n", name);
120 dev = class_name2dev(name);
122 CDEBUG(D_IOCTL, "No device for name %s!\n", name);
123 GOTO(out, rc = -EINVAL);
126 CDEBUG(D_IOCTL, "device name %s, dev %d\n", name, dev);
133 #define OBD_MAX_IOCTL_BUFFER 8192
135 static int obd_ioctl_is_invalid(struct obd_ioctl_data *data)
137 const int maxlen = 1 << 30;
138 if (data->ioc_len > maxlen) {
139 CERROR("OBD ioctl: ioc_len larger than 1<<30\n");
143 if (data->ioc_inllen1 > maxlen) {
144 CERROR("OBD ioctl: ioc_inllen1 larger than 1<<30\n");
148 if (data->ioc_inllen2 > maxlen) {
149 CERROR("OBD ioctl: ioc_inllen2 larger than 1<<30\n");
153 if (data->ioc_inllen3 > maxlen) {
154 CERROR("OBD ioctl: ioc_inllen3 larger than 1<<30\n");
158 if (data->ioc_inllen4 > maxlen) {
159 CERROR("OBD ioctl: ioc_inllen4 larger than 1<<30\n");
163 if (data->ioc_inlbuf1 && data->ioc_inllen1 == 0) {
164 CERROR("OBD ioctl: inlbuf1 pointer but 0 length\n");
168 if (data->ioc_inlbuf2 && data->ioc_inllen2 == 0) {
169 CERROR("OBD ioctl: inlbuf2 pointer but 0 length\n");
173 if (data->ioc_inlbuf3 && data->ioc_inllen3 == 0) {
174 CERROR("OBD ioctl: inlbuf3 pointer but 0 length\n");
178 if (data->ioc_inlbuf4 && data->ioc_inllen4 == 0) {
179 CERROR("OBD ioctl: inlbuf4 pointer but 0 length\n");
183 if (data->ioc_pbuf1 && data->ioc_plen1 == 0) {
184 CERROR("OBD ioctl: pbuf1 pointer but 0 length\n");
188 if (data->ioc_pbuf2 && data->ioc_plen2 == 0) {
189 CERROR("OBD ioctl: pbuf2 pointer but 0 length\n");
193 if (!data->ioc_pbuf1 && data->ioc_plen1 != 0) {
194 CERROR("OBD ioctl: plen1 set but NULL pointer\n");
198 if (!data->ioc_pbuf2 && data->ioc_plen2 != 0) {
199 CERROR("OBD ioctl: plen2 set but NULL pointer\n");
203 if (obd_ioctl_packlen(data) > data->ioc_len) {
204 CERROR("OBD ioctl: packlen exceeds ioc_len (%d > %d)\n",
205 obd_ioctl_packlen(data), data->ioc_len);
212 /* buffer MUST be at least the size of obd_ioctl_hdr */
213 int obd_ioctl_getdata(char **buf, int *len, void __user *arg)
215 struct obd_ioctl_hdr hdr;
216 struct obd_ioctl_data *data;
220 if (copy_from_user(&hdr, arg, sizeof(hdr)))
223 if (hdr.ioc_version != OBD_IOCTL_VERSION) {
224 CERROR("Version mismatch kernel (%x) vs application (%x)\n",
225 OBD_IOCTL_VERSION, hdr.ioc_version);
229 if (hdr.ioc_len > OBD_MAX_IOCTL_BUFFER) {
230 CERROR("User buffer len %d exceeds %d max buffer\n",
231 hdr.ioc_len, OBD_MAX_IOCTL_BUFFER);
235 if (hdr.ioc_len < sizeof(struct obd_ioctl_data)) {
236 CERROR("User buffer too small for ioctl (%d)\n", hdr.ioc_len);
240 /* When there are lots of processes calling vmalloc on multi-core
241 * system, the high lock contention will hurt performance badly,
242 * obdfilter-survey is an example, which relies on ioctl. So we'd
243 * better avoid vmalloc on ioctl path. LU-66
245 OBD_ALLOC_LARGE(*buf, hdr.ioc_len);
247 CERROR("Cannot allocate control buffer of len %d\n",
252 data = (struct obd_ioctl_data *)*buf;
254 if (copy_from_user(*buf, arg, hdr.ioc_len)) {
255 OBD_FREE_LARGE(*buf, hdr.ioc_len);
259 if (obd_ioctl_is_invalid(data)) {
260 CERROR("ioctl not correctly formatted\n");
261 OBD_FREE_LARGE(*buf, hdr.ioc_len);
265 if (data->ioc_inllen1) {
266 data->ioc_inlbuf1 = &data->ioc_bulk[0];
267 offset += cfs_size_round(data->ioc_inllen1);
270 if (data->ioc_inllen2) {
271 data->ioc_inlbuf2 = &data->ioc_bulk[0] + offset;
272 offset += cfs_size_round(data->ioc_inllen2);
275 if (data->ioc_inllen3) {
276 data->ioc_inlbuf3 = &data->ioc_bulk[0] + offset;
277 offset += cfs_size_round(data->ioc_inllen3);
280 if (data->ioc_inllen4)
281 data->ioc_inlbuf4 = &data->ioc_bulk[0] + offset;
285 EXPORT_SYMBOL(obd_ioctl_getdata);
287 int class_handle_ioctl(unsigned int cmd, unsigned long arg)
290 struct obd_ioctl_data *data;
291 struct obd_device *obd = NULL;
292 int err = 0, len = 0;
295 CDEBUG(D_IOCTL, "cmd = %x\n", cmd);
296 if (obd_ioctl_getdata(&buf, &len, (void __user *)arg)) {
297 CERROR("OBD ioctl: data error\n");
300 data = (struct obd_ioctl_data *)buf;
303 case OBD_IOC_PROCESS_CFG: {
304 struct lustre_cfg *lcfg;
306 if (!data->ioc_plen1 || !data->ioc_pbuf1) {
307 CERROR("No config buffer passed!\n");
308 GOTO(out, err = -EINVAL);
310 OBD_ALLOC(lcfg, data->ioc_plen1);
312 GOTO(out, err = -ENOMEM);
313 err = copy_from_user(lcfg, data->ioc_pbuf1,
316 err = lustre_cfg_sanity_check(lcfg, data->ioc_plen1);
318 err = class_process_config(lcfg);
320 OBD_FREE(lcfg, data->ioc_plen1);
324 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
325 case OBD_GET_VERSION: {
328 if (!data->ioc_inlbuf1) {
329 CERROR("No buffer passed in ioctl\n");
330 GOTO(out, err = -EINVAL);
333 if (strlen(LUSTRE_VERSION_STRING) + 1 > data->ioc_inllen1) {
334 CERROR("ioctl buffer too small to hold version\n");
335 GOTO(out, err = -EINVAL);
340 CWARN("%s: ioctl(OBD_GET_VERSION) is deprecated, "
341 "use llapi_get_version_string() and/or relink\n",
344 memcpy(data->ioc_bulk, LUSTRE_VERSION_STRING,
345 strlen(LUSTRE_VERSION_STRING) + 1);
347 if (copy_to_user((void __user *)arg, data, len))
352 case OBD_IOC_NAME2DEV: {
353 /* Resolve a device name. This does not change the
354 * currently selected device.
358 dev = class_resolve_dev_name(data->ioc_inllen1,
362 GOTO(out, err = -EINVAL);
364 if (copy_to_user((void __user *)arg, data, sizeof(*data)))
369 case OBD_IOC_UUID2DEV: {
370 /* Resolve a device uuid. This does not change the
371 * currently selected device.
374 struct obd_uuid uuid;
376 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
377 CERROR("No UUID passed!\n");
378 GOTO(out, err = -EINVAL);
380 if (data->ioc_inlbuf1[data->ioc_inllen1 - 1] != 0) {
381 CERROR("UUID not NUL terminated!\n");
382 GOTO(out, err = -EINVAL);
385 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
386 obd_str2uuid(&uuid, data->ioc_inlbuf1);
387 dev = class_uuid2dev(&uuid);
390 CDEBUG(D_IOCTL, "No device for UUID %s!\n",
392 GOTO(out, err = -EINVAL);
395 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
397 if (copy_to_user((void __user *)arg, data, sizeof(*data)))
402 case OBD_IOC_GETDEVICE: {
403 int index = data->ioc_count;
406 if (!data->ioc_inlbuf1) {
407 CERROR("No buffer passed in ioctl\n");
408 GOTO(out, err = -EINVAL);
410 if (data->ioc_inllen1 < 128) {
411 CERROR("ioctl buffer too small to hold version\n");
412 GOTO(out, err = -EINVAL);
415 obd = class_num2obd(index);
417 GOTO(out, err = -ENOENT);
419 if (obd->obd_stopping)
421 else if (obd->obd_inactive)
423 else if (obd->obd_set_up)
425 else if (obd->obd_attached)
430 str = (char *)data->ioc_bulk;
431 snprintf(str, len - sizeof(*data), "%3d %s %s %s %s %d",
432 (int)index, status, obd->obd_type->typ_name,
433 obd->obd_name, obd->obd_uuid.uuid,
434 atomic_read(&obd->obd_refcount));
436 if (copy_to_user((void __user *)arg, data, len))
444 if (data->ioc_dev == OBD_DEV_BY_DEVNAME) {
445 if (data->ioc_inllen4 <= 0 || data->ioc_inlbuf4 == NULL)
446 GOTO(out, err = -EINVAL);
447 if (strnlen(data->ioc_inlbuf4, MAX_OBD_NAME) >= MAX_OBD_NAME)
448 GOTO(out, err = -EINVAL);
449 obd = class_name2obd(data->ioc_inlbuf4);
450 } else if (data->ioc_dev < class_devno_max()) {
451 obd = class_num2obd(data->ioc_dev);
453 CERROR("OBD ioctl: No device\n");
454 GOTO(out, err = -EINVAL);
458 CERROR("OBD ioctl : No Device %d\n", data->ioc_dev);
459 GOTO(out, err = -EINVAL);
461 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
463 if (!obd->obd_set_up || obd->obd_stopping) {
464 CERROR("OBD ioctl: device not setup %d \n", data->ioc_dev);
465 GOTO(out, err = -EINVAL);
468 err = obd_iocontrol(cmd, obd->obd_self_export, len, data, NULL);
472 if (copy_to_user((void __user *)arg, data, len))
475 OBD_FREE_LARGE(buf, len);
477 } /* class_handle_ioctl */
479 /* to control /dev/obd */
480 static long obd_class_ioctl(struct file *filp, unsigned int cmd,
486 /* Allow non-root access for some limited ioctls */
487 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
488 RETURN(err = -EACCES);
490 if ((cmd & 0xffffff00) == ((int)'T') << 8) /* ignore all tty ioctls */
491 RETURN(err = -ENOTTY);
493 err = class_handle_ioctl(cmd, (unsigned long)arg);
498 /* declare character device */
499 static struct file_operations obd_psdev_fops = {
500 .owner = THIS_MODULE,
501 .unlocked_ioctl = obd_class_ioctl, /* unlocked_ioctl */
505 static struct miscdevice obd_psdev = {
506 .minor = MISC_DYNAMIC_MINOR,
507 .name = OBD_DEV_NAME,
508 .fops = &obd_psdev_fops,
511 #define test_string_to_size_err(value, expect, def_unit, __rc) \
516 BUILD_BUG_ON(sizeof(value) >= 23); \
517 __ret = sysfs_memparse(value, sizeof(value) - 1, &__size, def_unit); \
519 CERROR("string_helper: parsing '%s' expect rc %d != got %d\n", \
520 value, __rc, __ret); \
521 else if (!__ret && (u64)expect != __size) \
522 CERROR("string_helper: parsing '%s' expect %llu != got %llu\n",\
523 value, (u64)expect, __size); \
526 #define test_string_to_size_one(value, expect, def_unit) \
527 test_string_to_size_err(value, expect, def_unit, 0)
529 static int __init obd_init_checks(void)
531 __u64 u64val, div64val;
535 CDEBUG(D_INFO, "OBD_OBJECT_EOF = %#llx\n", (__u64)OBD_OBJECT_EOF);
537 u64val = OBD_OBJECT_EOF;
538 CDEBUG(D_INFO, "u64val OBD_OBJECT_EOF = %#llx\n", u64val);
539 if (u64val != OBD_OBJECT_EOF) {
540 CERROR("__u64 %#llx(%d) != 0xffffffffffffffff\n",
541 u64val, (int)sizeof(u64val));
544 len = snprintf(buf, sizeof(buf), "%#llx", u64val);
546 CERROR("u64 hex wrong length, strlen(%s)=%d != 18\n", buf, len);
550 div64val = OBD_OBJECT_EOF;
551 CDEBUG(D_INFO, "u64val OBD_OBJECT_EOF = %#llx\n", u64val);
552 if (u64val != OBD_OBJECT_EOF) {
553 CERROR("__u64 %#llx(%d) != 0xffffffffffffffff\n",
554 u64val, (int)sizeof(u64val));
557 if (u64val >> 8 != OBD_OBJECT_EOF >> 8) {
558 CERROR("__u64 %#llx(%d) != 0xffffffffffffffff\n",
559 u64val, (int)sizeof(u64val));
562 if (do_div(div64val, 256) != (u64val & 255)) {
563 CERROR("do_div(%#llx,256) != %llu\n", u64val, u64val & 255);
566 if (u64val >> 8 != div64val) {
567 CERROR("do_div(%#llx,256) %llu != %llu\n",
568 u64val, div64val, u64val >> 8);
571 len = snprintf(buf, sizeof(buf), "%#llx", u64val);
573 CERROR("u64 hex wrong length! strlen(%s)=%d != 18\n", buf, len);
576 len = snprintf(buf, sizeof(buf), "%llu", u64val);
578 CERROR("u64 wrong length! strlen(%s)=%d != 20\n", buf, len);
581 len = snprintf(buf, sizeof(buf), "%lld", u64val);
583 CERROR("s64 wrong length! strlen(%s)=%d != 2\n", buf, len);
586 if ((u64val & ~PAGE_MASK) >= PAGE_SIZE) {
587 CERROR("mask failed: u64val %llu >= %llu\n", u64val,
595 if (!test_string_to_size_err("256B34", 256, "B", -EINVAL)) {
596 CERROR("string_helpers: format should be number then units\n");
599 if (!test_string_to_size_err("132OpQ", 132, "B", -EINVAL)) {
600 CERROR("string_helpers: invalid units should be rejected\n");
603 if (!test_string_to_size_err("1.82B", 1, "B", -EINVAL)) {
604 CERROR("string_helpers: 'B' with '.' should be invalid\n");
607 if (test_string_to_size_one("343\n", 343, "B")) {
608 CERROR("string_helpers: should ignore newline\n");
614 /* memparse unit handling */
616 ret += test_string_to_size_one("0B", 0, "B");
617 ret += test_string_to_size_one("512B", 512, "B");
618 ret += test_string_to_size_one("1.067kB", 1067, "B");
619 ret += test_string_to_size_one("1.042KiB", 1067, "B");
620 ret += test_string_to_size_one("8", 8388608, "M");
621 ret += test_string_to_size_one("65536", 65536, "B");
622 ret += test_string_to_size_one("128", 131072, "K");
623 ret += test_string_to_size_one("1M", 1048576, "B");
624 ret += test_string_to_size_one("0.5T", 549755813888ULL, "T");
625 ret += test_string_to_size_one("256.5G", 275414777856ULL, "G");
629 /* string helper values */
630 ret += test_string_to_size_one("16", 16777216, "MiB");
631 ret += test_string_to_size_one("8.39MB", 8390000, "MiB");
632 ret += test_string_to_size_one("8.00MiB", 8388608, "MiB");
633 ret += test_string_to_size_one("256GB", 256000000000ULL, "GiB");
634 ret += test_string_to_size_one("238.731GiB", 256335459385ULL, "GiB");
639 ret += test_string_to_size_one("0.4TB", 400000000000ULL, "TiB");
640 ret += test_string_to_size_one("12.5TiB", 13743895347200ULL, "TiB");
641 ret += test_string_to_size_one("2PB", 2000000000000000ULL, "PiB");
642 ret += test_string_to_size_one("16PiB", 18014398509481984ULL, "PiB");
646 /* huge values should overflow */
647 if (!test_string_to_size_err("1000EiB", 0, "EiB", -EOVERFLOW)) {
648 CERROR("string_helpers: failed to detect binary overflow\n");
651 if (!test_string_to_size_err("1000EB", 0, "EiB", -EOVERFLOW)) {
652 CERROR("string_helpers: failed to detect decimal overflow\n");
659 static int __init obdclass_init(void)
663 LCONSOLE_INFO("Lustre: Build Version: "LUSTRE_VERSION_STRING"\n");
667 err = obd_init_checks();
671 #ifdef CONFIG_PROC_FS
672 obd_memory = lprocfs_alloc_stats(OBD_STATS_NUM,
673 LPROCFS_STATS_FLAG_NONE |
674 LPROCFS_STATS_FLAG_IRQ_SAFE);
675 if (obd_memory == NULL) {
676 CERROR("kmalloc of 'obd_memory' failed\n");
680 lprocfs_counter_init(obd_memory, OBD_MEMORY_STAT,
681 LPROCFS_CNTR_AVGMINMAX,
684 err = obd_zombie_impexp_init();
686 goto cleanup_obd_memory;
688 err = class_handle_init();
690 goto cleanup_zombie_impexp;
692 err = misc_register(&obd_psdev);
694 CERROR("cannot register OBD miscdevice: err = %d\n", err);
695 goto cleanup_class_handle;
698 /* Default the dirty page cache cap to 1/2 of system memory.
699 * For clients with less memory, a larger fraction is needed
700 * for other purposes (mostly for BGL). */
701 if (cfs_totalram_pages() <= 512 << (20 - PAGE_SHIFT))
702 obd_max_dirty_pages = cfs_totalram_pages() / 4;
704 obd_max_dirty_pages = cfs_totalram_pages() / 2;
706 err = obd_init_caches();
708 goto cleanup_deregister;
710 err = class_procfs_init();
714 err = lu_global_init();
716 goto cleanup_class_procfs;
718 err = cl_global_init();
720 goto cleanup_lu_global;
722 #ifdef HAVE_SERVER_SUPPORT
723 err = dt_global_init();
725 goto cleanup_cl_global;
727 err = lu_ucred_global_init();
729 goto cleanup_dt_global;
730 #endif /* HAVE_SERVER_SUPPORT */
732 err = llog_info_init();
734 #ifdef HAVE_SERVER_SUPPORT
735 goto cleanup_lu_ucred_global;
736 #else /* !HAVE_SERVER_SUPPORT */
737 goto cleanup_cl_global;
738 #endif /* HAVE_SERVER_SUPPORT */
740 err = lustre_register_fs();
742 /* simulate a late OOM situation now to require all
743 * alloc'ed/initialized resources to be freed */
744 if (OBD_FAIL_CHECK(OBD_FAIL_OBDCLASS_MODULE_LOAD)) {
745 /* fake error but filesystem has been registered */
746 lustre_unregister_fs();
747 /* force error to ensure module will be unloaded/cleaned */
752 goto cleanup_llog_info;
759 #ifdef HAVE_SERVER_SUPPORT
760 cleanup_lu_ucred_global:
761 lu_ucred_global_fini();
765 #endif /* HAVE_SERVER_SUPPORT */
773 cleanup_class_procfs:
774 class_procfs_clean();
777 obd_cleanup_caches();
780 misc_deregister(&obd_psdev);
782 cleanup_class_handle:
783 class_handle_cleanup();
785 cleanup_zombie_impexp:
786 obd_zombie_impexp_stop();
789 #ifdef CONFIG_PROC_FS
790 lprocfs_free_stats(&obd_memory);
796 void obd_update_maxusage(void)
800 max = obd_memory_sum();
802 spin_lock(&obd_updatemax_lock);
803 if (max > obd_max_alloc)
805 spin_unlock(&obd_updatemax_lock);
807 EXPORT_SYMBOL(obd_update_maxusage);
809 #ifdef CONFIG_PROC_FS
810 __u64 obd_memory_max(void)
814 obd_update_maxusage();
815 spin_lock(&obd_updatemax_lock);
817 spin_unlock(&obd_updatemax_lock);
821 #endif /* CONFIG_PROC_FS */
823 static void __exit obdclass_exit(void)
825 #ifdef CONFIG_PROC_FS
828 #endif /* CONFIG_PROC_FS */
831 lustre_unregister_fs();
833 misc_deregister(&obd_psdev);
835 #ifdef HAVE_SERVER_SUPPORT
836 lu_ucred_global_fini();
838 #endif /* HAVE_SERVER_SUPPORT */
842 obd_cleanup_caches();
844 class_procfs_clean();
846 class_handle_cleanup();
847 class_del_uuid(NULL); /* Delete all UUIDs. */
848 obd_zombie_impexp_stop();
850 #ifdef CONFIG_PROC_FS
851 memory_leaked = obd_memory_sum();
852 memory_max = obd_memory_max();
854 lprocfs_free_stats(&obd_memory);
855 /* the below message is checked in test-framework.sh check_mem_leak() */
856 CDEBUG((memory_leaked) ? D_ERROR : D_INFO,
857 "obd_memory max: %llu, leaked: %llu\n",
858 memory_max, memory_leaked);
859 #endif /* CONFIG_PROC_FS */
864 void obd_heat_clear(struct obd_heat_instance *instance, int count)
868 memset(instance, 0, sizeof(*instance) * count);
871 EXPORT_SYMBOL(obd_heat_clear);
874 * The file heat is calculated for every time interval period I. The access
875 * frequency during each period is counted. The file heat is only recalculated
876 * at the end of a time period. And a percentage of the former file heat is
877 * lost when recalculated. The recursion formula to calculate the heat of the
878 * file f is as follow:
880 * Hi+1(f) = (1-P)*Hi(f)+ P*Ci
882 * Where Hi is the heat value in the period between time points i*I and
883 * (i+1)*I; Ci is the access count in the period; the symbol P refers to the
884 * weight of Ci. The larger the value the value of P is, the more influence Ci
885 * has on the file heat.
887 void obd_heat_decay(struct obd_heat_instance *instance, __u64 time_second,
888 unsigned int weight, unsigned int period_second)
894 if (instance->ohi_time_second > time_second) {
895 obd_heat_clear(instance, 1);
899 if (instance->ohi_time_second == 0)
902 for (second = instance->ohi_time_second + period_second;
903 second < time_second;
904 second += period_second) {
905 instance->ohi_heat = instance->ohi_heat *
906 (256 - weight) / 256 +
907 instance->ohi_count * weight / 256;
908 instance->ohi_count = 0;
909 instance->ohi_time_second = second;
913 EXPORT_SYMBOL(obd_heat_decay);
915 __u64 obd_heat_get(struct obd_heat_instance *instance, unsigned int time_second,
916 unsigned int weight, unsigned int period_second)
920 obd_heat_decay(instance, time_second, weight, period_second);
922 if (instance->ohi_count == 0)
923 RETURN(instance->ohi_heat);
925 RETURN(instance->ohi_heat * (256 - weight) / 256 +
926 instance->ohi_count * weight / 256);
928 EXPORT_SYMBOL(obd_heat_get);
930 void obd_heat_add(struct obd_heat_instance *instance,
931 unsigned int time_second, __u64 count,
932 unsigned int weight, unsigned int period_second)
936 obd_heat_decay(instance, time_second, weight, period_second);
937 if (instance->ohi_time_second == 0) {
938 instance->ohi_time_second = time_second;
939 instance->ohi_heat = 0;
940 instance->ohi_count = count;
942 instance->ohi_count += count;
946 EXPORT_SYMBOL(obd_heat_add);
948 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
949 MODULE_DESCRIPTION("Lustre Class Driver");
950 MODULE_VERSION(LUSTRE_VERSION_STRING);
951 MODULE_LICENSE("GPL");
953 module_init(obdclass_init);
954 module_exit(obdclass_exit);