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_kernelcomm.h>
45 #include <lprocfs_status.h>
46 #include <cl_object.h>
47 #ifdef HAVE_SERVER_SUPPORT
48 # include <dt_object.h>
49 # include <md_object.h>
50 #endif /* HAVE_SERVER_SUPPORT */
51 #include <uapi/linux/lustre/lustre_ioctl.h>
52 #include "llog_internal.h"
55 static __u64 obd_max_alloc;
60 static DEFINE_SPINLOCK(obd_updatemax_lock);
62 /* The following are visible and mutable through /proc/sys/lustre/. */
63 unsigned int obd_debug_peer_on_timeout;
64 EXPORT_SYMBOL(obd_debug_peer_on_timeout);
65 unsigned int obd_dump_on_timeout;
66 EXPORT_SYMBOL(obd_dump_on_timeout);
67 unsigned int obd_dump_on_eviction;
68 EXPORT_SYMBOL(obd_dump_on_eviction);
69 unsigned int obd_lbug_on_eviction;
70 EXPORT_SYMBOL(obd_lbug_on_eviction);
71 unsigned long obd_max_dirty_pages;
72 EXPORT_SYMBOL(obd_max_dirty_pages);
73 atomic_long_t obd_dirty_pages;
74 EXPORT_SYMBOL(obd_dirty_pages);
75 unsigned int obd_timeout = OBD_TIMEOUT_DEFAULT; /* seconds */
76 EXPORT_SYMBOL(obd_timeout);
77 unsigned int ldlm_timeout = LDLM_TIMEOUT_DEFAULT; /* seconds */
78 EXPORT_SYMBOL(ldlm_timeout);
79 unsigned int obd_timeout_set;
80 EXPORT_SYMBOL(obd_timeout_set);
81 unsigned int ldlm_timeout_set;
82 EXPORT_SYMBOL(ldlm_timeout_set);
83 /* bulk transfer timeout, give up after 100s by default */
84 unsigned int bulk_timeout = 100; /* seconds */
85 EXPORT_SYMBOL(bulk_timeout);
86 /* Adaptive timeout defs here instead of ptlrpc module for /proc/sys/ access */
87 unsigned int at_min = 0;
88 EXPORT_SYMBOL(at_min);
89 unsigned int at_max = 600;
90 EXPORT_SYMBOL(at_max);
91 unsigned int at_history = 600;
92 EXPORT_SYMBOL(at_history);
93 int at_early_margin = 5;
94 EXPORT_SYMBOL(at_early_margin);
96 EXPORT_SYMBOL(at_extra);
99 struct lprocfs_stats *obd_memory = NULL;
100 EXPORT_SYMBOL(obd_memory);
103 static int class_resolve_dev_name(__u32 len, const char *name)
110 CERROR("No name passed,!\n");
111 GOTO(out, rc = -EINVAL);
113 if (name[len - 1] != 0) {
114 CERROR("Name not nul terminated!\n");
115 GOTO(out, rc = -EINVAL);
118 CDEBUG(D_IOCTL, "device name %s\n", name);
119 dev = class_name2dev(name);
121 CDEBUG(D_IOCTL, "No device for name %s!\n", name);
122 GOTO(out, rc = -EINVAL);
125 CDEBUG(D_IOCTL, "device name %s, dev %d\n", name, dev);
132 #define OBD_MAX_IOCTL_BUFFER 8192
134 static int obd_ioctl_is_invalid(struct obd_ioctl_data *data)
136 const int maxlen = 1 << 30;
137 if (data->ioc_len > maxlen) {
138 CERROR("OBD ioctl: ioc_len larger than 1<<30\n");
142 if (data->ioc_inllen1 > maxlen) {
143 CERROR("OBD ioctl: ioc_inllen1 larger than 1<<30\n");
147 if (data->ioc_inllen2 > maxlen) {
148 CERROR("OBD ioctl: ioc_inllen2 larger than 1<<30\n");
152 if (data->ioc_inllen3 > maxlen) {
153 CERROR("OBD ioctl: ioc_inllen3 larger than 1<<30\n");
157 if (data->ioc_inllen4 > maxlen) {
158 CERROR("OBD ioctl: ioc_inllen4 larger than 1<<30\n");
162 if (data->ioc_inlbuf1 && data->ioc_inllen1 == 0) {
163 CERROR("OBD ioctl: inlbuf1 pointer but 0 length\n");
167 if (data->ioc_inlbuf2 && data->ioc_inllen2 == 0) {
168 CERROR("OBD ioctl: inlbuf2 pointer but 0 length\n");
172 if (data->ioc_inlbuf3 && data->ioc_inllen3 == 0) {
173 CERROR("OBD ioctl: inlbuf3 pointer but 0 length\n");
177 if (data->ioc_inlbuf4 && data->ioc_inllen4 == 0) {
178 CERROR("OBD ioctl: inlbuf4 pointer but 0 length\n");
182 if (data->ioc_pbuf1 && data->ioc_plen1 == 0) {
183 CERROR("OBD ioctl: pbuf1 pointer but 0 length\n");
187 if (data->ioc_pbuf2 && data->ioc_plen2 == 0) {
188 CERROR("OBD ioctl: pbuf2 pointer but 0 length\n");
192 if (!data->ioc_pbuf1 && data->ioc_plen1 != 0) {
193 CERROR("OBD ioctl: plen1 set but NULL pointer\n");
197 if (!data->ioc_pbuf2 && data->ioc_plen2 != 0) {
198 CERROR("OBD ioctl: plen2 set but NULL pointer\n");
202 if (obd_ioctl_packlen(data) > data->ioc_len) {
203 CERROR("OBD ioctl: packlen exceeds ioc_len (%d > %d)\n",
204 obd_ioctl_packlen(data), data->ioc_len);
211 /* buffer MUST be at least the size of obd_ioctl_hdr */
212 int obd_ioctl_getdata(struct obd_ioctl_data **datap, int *len, void __user *arg)
214 struct obd_ioctl_hdr hdr;
215 struct obd_ioctl_data *data;
219 if (copy_from_user(&hdr, arg, sizeof(hdr)))
222 if (hdr.ioc_version != OBD_IOCTL_VERSION) {
223 CERROR("Version mismatch kernel (%x) vs application (%x)\n",
224 OBD_IOCTL_VERSION, hdr.ioc_version);
228 if (hdr.ioc_len > OBD_MAX_IOCTL_BUFFER) {
229 CERROR("User buffer len %d exceeds %d max buffer\n",
230 hdr.ioc_len, OBD_MAX_IOCTL_BUFFER);
234 if (hdr.ioc_len < sizeof(struct obd_ioctl_data)) {
235 CERROR("User buffer too small for ioctl (%d)\n", hdr.ioc_len);
239 /* When there are lots of processes calling vmalloc on multi-core
240 * system, the high lock contention will hurt performance badly,
241 * obdfilter-survey is an example, which relies on ioctl. So we'd
242 * better avoid vmalloc on ioctl path. LU-66
244 OBD_ALLOC_LARGE(data, hdr.ioc_len);
246 CERROR("Cannot allocate control buffer of len %d\n",
252 if (copy_from_user(data, arg, hdr.ioc_len)) {
253 OBD_FREE_LARGE(data, hdr.ioc_len);
257 if (obd_ioctl_is_invalid(data)) {
258 CERROR("ioctl not correctly formatted\n");
259 OBD_FREE_LARGE(data, hdr.ioc_len);
263 if (data->ioc_inllen1) {
264 data->ioc_inlbuf1 = &data->ioc_bulk[0];
265 offset += cfs_size_round(data->ioc_inllen1);
268 if (data->ioc_inllen2) {
269 data->ioc_inlbuf2 = &data->ioc_bulk[0] + offset;
270 offset += cfs_size_round(data->ioc_inllen2);
273 if (data->ioc_inllen3) {
274 data->ioc_inlbuf3 = &data->ioc_bulk[0] + offset;
275 offset += cfs_size_round(data->ioc_inllen3);
278 if (data->ioc_inllen4)
279 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)
289 struct obd_ioctl_data *data;
290 struct obd_device *obd = NULL;
291 int err = 0, len = 0;
294 CDEBUG(D_IOCTL, "cmd = %x\n", cmd);
295 if (obd_ioctl_getdata(&data, &len, (void __user *)arg)) {
296 CERROR("OBD ioctl: data error\n");
301 case OBD_IOC_PROCESS_CFG: {
302 struct lustre_cfg *lcfg;
304 if (!data->ioc_plen1 || !data->ioc_pbuf1) {
305 CERROR("No config buffer passed!\n");
306 GOTO(out, err = -EINVAL);
308 OBD_ALLOC(lcfg, data->ioc_plen1);
310 GOTO(out, err = -ENOMEM);
311 err = copy_from_user(lcfg, data->ioc_pbuf1,
314 err = lustre_cfg_sanity_check(lcfg, data->ioc_plen1);
316 err = class_process_config(lcfg);
318 OBD_FREE(lcfg, data->ioc_plen1);
322 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
323 case OBD_GET_VERSION: {
326 if (!data->ioc_inlbuf1) {
327 CERROR("No buffer passed in ioctl\n");
328 GOTO(out, err = -EINVAL);
331 if (strlen(LUSTRE_VERSION_STRING) + 1 > data->ioc_inllen1) {
332 CERROR("ioctl buffer too small to hold version\n");
333 GOTO(out, err = -EINVAL);
338 CWARN("%s: ioctl(OBD_GET_VERSION) is deprecated, "
339 "use llapi_get_version_string() and/or relink\n",
342 memcpy(data->ioc_bulk, LUSTRE_VERSION_STRING,
343 strlen(LUSTRE_VERSION_STRING) + 1);
345 if (copy_to_user((void __user *)arg, data, len))
350 case OBD_IOC_NAME2DEV: {
351 /* Resolve a device name. This does not change the
352 * currently selected device.
356 dev = class_resolve_dev_name(data->ioc_inllen1,
360 GOTO(out, err = -EINVAL);
362 if (copy_to_user((void __user *)arg, data, sizeof(*data)))
367 case OBD_IOC_UUID2DEV: {
368 /* Resolve a device uuid. This does not change the
369 * currently selected device.
372 struct obd_uuid uuid;
374 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
375 CERROR("No UUID passed!\n");
376 GOTO(out, err = -EINVAL);
378 if (data->ioc_inlbuf1[data->ioc_inllen1 - 1] != 0) {
379 CERROR("UUID not NUL terminated!\n");
380 GOTO(out, err = -EINVAL);
383 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
384 obd_str2uuid(&uuid, data->ioc_inlbuf1);
385 dev = class_uuid2dev(&uuid);
388 CDEBUG(D_IOCTL, "No device for UUID %s!\n",
390 GOTO(out, err = -EINVAL);
393 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
395 if (copy_to_user((void __user *)arg, data, sizeof(*data)))
400 case OBD_IOC_GETDEVICE: {
401 int index = data->ioc_count;
404 if (!data->ioc_inlbuf1) {
405 CERROR("No buffer passed in ioctl\n");
406 GOTO(out, err = -EINVAL);
408 if (data->ioc_inllen1 < 128) {
409 CERROR("ioctl buffer too small to hold version\n");
410 GOTO(out, err = -EINVAL);
413 obd = class_num2obd(index);
415 GOTO(out, err = -ENOENT);
417 if (obd->obd_stopping)
419 else if (obd->obd_inactive)
421 else if (obd->obd_set_up)
423 else if (obd->obd_attached)
428 str = (char *)data->ioc_bulk;
429 snprintf(str, len - sizeof(*data), "%3d %s %s %s %s %d",
430 (int)index, status, obd->obd_type->typ_name,
431 obd->obd_name, obd->obd_uuid.uuid,
432 atomic_read(&obd->obd_refcount));
434 if (copy_to_user((void __user *)arg, data, len))
442 if (data->ioc_dev == OBD_DEV_BY_DEVNAME) {
443 if (data->ioc_inllen4 <= 0 || data->ioc_inlbuf4 == NULL)
444 GOTO(out, err = -EINVAL);
445 if (strnlen(data->ioc_inlbuf4, MAX_OBD_NAME) >= MAX_OBD_NAME)
446 GOTO(out, err = -EINVAL);
447 obd = class_name2obd(data->ioc_inlbuf4);
448 } else if (data->ioc_dev < class_devno_max()) {
449 obd = class_num2obd(data->ioc_dev);
451 CERROR("OBD ioctl: No device\n");
452 GOTO(out, err = -EINVAL);
456 CERROR("OBD ioctl : No Device %d\n", data->ioc_dev);
457 GOTO(out, err = -EINVAL);
459 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
461 if (!obd->obd_set_up || obd->obd_stopping) {
462 CERROR("OBD ioctl: device not setup %d \n", data->ioc_dev);
463 GOTO(out, err = -EINVAL);
466 err = obd_iocontrol(cmd, obd->obd_self_export, len, data, NULL);
470 if (copy_to_user((void __user *)arg, data, len))
473 OBD_FREE_LARGE(data, len);
475 } /* class_handle_ioctl */
477 /* to control /dev/obd */
478 static long obd_class_ioctl(struct file *filp, unsigned int cmd,
484 /* Allow non-root access for some limited ioctls */
485 if (!cfs_capable(CAP_SYS_ADMIN))
486 RETURN(err = -EACCES);
488 if ((cmd & 0xffffff00) == ((int)'T') << 8) /* ignore all tty ioctls */
489 RETURN(err = -ENOTTY);
491 err = class_handle_ioctl(cmd, (unsigned long)arg);
496 /* declare character device */
497 static const struct file_operations obd_psdev_fops = {
498 .owner = THIS_MODULE,
499 .unlocked_ioctl = obd_class_ioctl, /* unlocked_ioctl */
503 static struct miscdevice obd_psdev = {
504 .minor = MISC_DYNAMIC_MINOR,
505 .name = OBD_DEV_NAME,
506 .fops = &obd_psdev_fops,
509 #define test_string_to_size_err(value, expect, def_unit, __rc) \
514 BUILD_BUG_ON(sizeof(value) >= 23); \
515 __ret = sysfs_memparse(value, sizeof(value) - 1, &__size, def_unit); \
517 CERROR("string_helper: parsing '%s' expect rc %d != got %d\n", \
518 value, __rc, __ret); \
519 else if (!__ret && (u64)expect != __size) \
520 CERROR("string_helper: parsing '%s' expect %llu != got %llu\n",\
521 value, (u64)expect, __size); \
524 #define test_string_to_size_one(value, expect, def_unit) \
525 test_string_to_size_err(value, expect, def_unit, 0)
527 static int __init obd_init_checks(void)
529 __u64 u64val, div64val;
533 CDEBUG(D_INFO, "OBD_OBJECT_EOF = %#llx\n", (__u64)OBD_OBJECT_EOF);
535 u64val = OBD_OBJECT_EOF;
536 CDEBUG(D_INFO, "u64val OBD_OBJECT_EOF = %#llx\n", u64val);
537 if (u64val != OBD_OBJECT_EOF) {
538 CERROR("__u64 %#llx(%d) != 0xffffffffffffffff\n",
539 u64val, (int)sizeof(u64val));
542 len = snprintf(buf, sizeof(buf), "%#llx", u64val);
544 CERROR("u64 hex wrong length, strlen(%s)=%d != 18\n", buf, len);
548 div64val = OBD_OBJECT_EOF;
549 CDEBUG(D_INFO, "u64val OBD_OBJECT_EOF = %#llx\n", u64val);
550 if (u64val != OBD_OBJECT_EOF) {
551 CERROR("__u64 %#llx(%d) != 0xffffffffffffffff\n",
552 u64val, (int)sizeof(u64val));
555 if (u64val >> 8 != OBD_OBJECT_EOF >> 8) {
556 CERROR("__u64 %#llx(%d) != 0xffffffffffffffff\n",
557 u64val, (int)sizeof(u64val));
560 if (do_div(div64val, 256) != (u64val & 255)) {
561 CERROR("do_div(%#llx,256) != %llu\n", u64val, u64val & 255);
564 if (u64val >> 8 != div64val) {
565 CERROR("do_div(%#llx,256) %llu != %llu\n",
566 u64val, div64val, u64val >> 8);
569 len = snprintf(buf, sizeof(buf), "%#llx", u64val);
571 CERROR("u64 hex wrong length! strlen(%s)=%d != 18\n", buf, len);
574 len = snprintf(buf, sizeof(buf), "%llu", u64val);
576 CERROR("u64 wrong length! strlen(%s)=%d != 20\n", buf, len);
579 len = snprintf(buf, sizeof(buf), "%lld", u64val);
581 CERROR("s64 wrong length! strlen(%s)=%d != 2\n", buf, len);
584 if ((u64val & ~PAGE_MASK) >= PAGE_SIZE) {
585 CERROR("mask failed: u64val %llu >= %llu\n", u64val,
593 if (!test_string_to_size_err("256B34", 256, "B", -EINVAL)) {
594 CERROR("string_helpers: format should be number then units\n");
597 if (!test_string_to_size_err("132OpQ", 132, "B", -EINVAL)) {
598 CERROR("string_helpers: invalid units should be rejected\n");
601 if (!test_string_to_size_err("1.82B", 1, "B", -EINVAL)) {
602 CERROR("string_helpers: 'B' with '.' should be invalid\n");
605 if (test_string_to_size_one("343\n", 343, "B")) {
606 CERROR("string_helpers: should ignore newline\n");
612 /* memparse unit handling */
614 ret += test_string_to_size_one("0B", 0, "B");
615 ret += test_string_to_size_one("512B", 512, "B");
616 ret += test_string_to_size_one("1.067kB", 1067, "B");
617 ret += test_string_to_size_one("1.042KiB", 1067, "B");
618 ret += test_string_to_size_one("8", 8388608, "M");
619 ret += test_string_to_size_one("65536", 65536, "B");
620 ret += test_string_to_size_one("128", 131072, "K");
621 ret += test_string_to_size_one("1M", 1048576, "B");
622 ret += test_string_to_size_one("0.5T", 549755813888ULL, "T");
623 ret += test_string_to_size_one("256.5G", 275414777856ULL, "G");
627 /* string helper values */
628 ret += test_string_to_size_one("16", 16777216, "MiB");
629 ret += test_string_to_size_one("8.39MB", 8390000, "MiB");
630 ret += test_string_to_size_one("8.00MiB", 8388608, "MiB");
631 ret += test_string_to_size_one("256GB", 256000000000ULL, "GiB");
632 ret += test_string_to_size_one("238.731GiB", 256335459385ULL, "GiB");
637 ret += test_string_to_size_one("0.4TB", 400000000000ULL, "TiB");
638 ret += test_string_to_size_one("12.5TiB", 13743895347200ULL, "TiB");
639 ret += test_string_to_size_one("2PB", 2000000000000000ULL, "PiB");
640 ret += test_string_to_size_one("16PiB", 18014398509481984ULL, "PiB");
644 /* huge values should overflow */
645 if (!test_string_to_size_err("1000EiB", 0, "EiB", -EOVERFLOW)) {
646 CERROR("string_helpers: failed to detect binary overflow\n");
649 if (!test_string_to_size_err("1000EB", 0, "EiB", -EOVERFLOW)) {
650 CERROR("string_helpers: failed to detect decimal overflow\n");
657 static int __init obdclass_init(void)
661 LCONSOLE_INFO("Lustre: Build Version: "LUSTRE_VERSION_STRING"\n");
665 err = obd_init_checks();
669 #ifdef CONFIG_PROC_FS
670 obd_memory = lprocfs_alloc_stats(OBD_STATS_NUM,
671 LPROCFS_STATS_FLAG_NONE |
672 LPROCFS_STATS_FLAG_IRQ_SAFE);
673 if (obd_memory == NULL) {
674 CERROR("kmalloc of 'obd_memory' failed\n");
678 lprocfs_counter_init(obd_memory, OBD_MEMORY_STAT,
679 LPROCFS_CNTR_AVGMINMAX,
682 err = obd_zombie_impexp_init();
684 goto cleanup_obd_memory;
686 err = class_handle_init();
688 goto cleanup_zombie_impexp;
690 err = misc_register(&obd_psdev);
692 CERROR("cannot register OBD miscdevice: err = %d\n", err);
693 goto cleanup_class_handle;
696 /* Default the dirty page cache cap to 1/2 of system memory.
697 * For clients with less memory, a larger fraction is needed
698 * for other purposes (mostly for BGL). */
699 if (cfs_totalram_pages() <= 512 << (20 - PAGE_SHIFT))
700 obd_max_dirty_pages = cfs_totalram_pages() / 4;
702 obd_max_dirty_pages = cfs_totalram_pages() / 2;
704 err = obd_init_caches();
706 goto cleanup_deregister;
708 err = class_procfs_init();
712 err = lu_global_init();
714 goto cleanup_class_procfs;
716 err = cl_global_init();
718 goto cleanup_lu_global;
720 err = llog_info_init();
722 goto cleanup_cl_global;
724 #ifdef HAVE_SERVER_SUPPORT
725 err = dt_global_init();
727 goto cleanup_llog_info;
729 err = lu_ucred_global_init();
731 goto cleanup_dt_global;
733 err = lustre_tgt_register_fs();
734 if (err && err != -EBUSY) {
735 /* Don't fail if server code also registers "lustre_tgt" */
736 CERROR("obdclass: register fstype 'lustre_tgt' failed: rc = %d\n",
738 goto cleanup_lu_ucred_global;
740 #endif /* HAVE_SERVER_SUPPORT */
742 /* simulate a late OOM situation now to require all
743 * alloc'ed/initialized resources to be freed
745 if (OBD_FAIL_CHECK(OBD_FAIL_OBDCLASS_MODULE_LOAD)) {
746 /* force error to ensure module will be unloaded/cleaned */
753 #ifdef HAVE_SERVER_SUPPORT
754 /* fake error but filesystem has been registered */
755 lustre_tgt_unregister_fs();
757 cleanup_lu_ucred_global:
758 lu_ucred_global_fini();
764 #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 misc_deregister(&obd_psdev);
832 #ifdef HAVE_SERVER_SUPPORT
833 lustre_tgt_unregister_fs();
834 lu_ucred_global_fini();
836 #endif /* HAVE_SERVER_SUPPORT */
841 obd_cleanup_caches();
843 class_procfs_clean();
845 class_handle_cleanup();
846 class_del_uuid(NULL); /* Delete all UUIDs. */
847 obd_zombie_impexp_stop();
849 #ifdef CONFIG_PROC_FS
850 memory_leaked = obd_memory_sum();
851 memory_max = obd_memory_max();
853 lprocfs_free_stats(&obd_memory);
854 /* the below message is checked in test-framework.sh check_mem_leak() */
855 CDEBUG((memory_leaked) ? D_ERROR : D_INFO,
856 "obd_memory max: %llu, leaked: %llu\n",
857 memory_max, memory_leaked);
858 #endif /* CONFIG_PROC_FS */
863 void obd_heat_clear(struct obd_heat_instance *instance, int count)
867 memset(instance, 0, sizeof(*instance) * count);
870 EXPORT_SYMBOL(obd_heat_clear);
873 * The file heat is calculated for every time interval period I. The access
874 * frequency during each period is counted. The file heat is only recalculated
875 * at the end of a time period. And a percentage of the former file heat is
876 * lost when recalculated. The recursion formula to calculate the heat of the
877 * file f is as follow:
879 * Hi+1(f) = (1-P)*Hi(f)+ P*Ci
881 * Where Hi is the heat value in the period between time points i*I and
882 * (i+1)*I; Ci is the access count in the period; the symbol P refers to the
883 * weight of Ci. The larger the value the value of P is, the more influence Ci
884 * has on the file heat.
886 void obd_heat_decay(struct obd_heat_instance *instance, __u64 time_second,
887 unsigned int weight, unsigned int period_second)
893 if (instance->ohi_time_second > time_second) {
894 obd_heat_clear(instance, 1);
898 if (instance->ohi_time_second == 0)
901 for (second = instance->ohi_time_second + period_second;
902 second < time_second;
903 second += period_second) {
904 instance->ohi_heat = instance->ohi_heat *
905 (256 - weight) / 256 +
906 instance->ohi_count * weight / 256;
907 instance->ohi_count = 0;
908 instance->ohi_time_second = second;
912 EXPORT_SYMBOL(obd_heat_decay);
914 __u64 obd_heat_get(struct obd_heat_instance *instance, unsigned int time_second,
915 unsigned int weight, unsigned int period_second)
919 obd_heat_decay(instance, time_second, weight, period_second);
921 if (instance->ohi_count == 0)
922 RETURN(instance->ohi_heat);
924 RETURN(instance->ohi_heat * (256 - weight) / 256 +
925 instance->ohi_count * weight / 256);
927 EXPORT_SYMBOL(obd_heat_get);
929 void obd_heat_add(struct obd_heat_instance *instance,
930 unsigned int time_second, __u64 count,
931 unsigned int weight, unsigned int period_second)
935 obd_heat_decay(instance, time_second, weight, period_second);
936 if (instance->ohi_time_second == 0) {
937 instance->ohi_time_second = time_second;
938 instance->ohi_heat = 0;
939 instance->ohi_count = count;
941 instance->ohi_count += count;
945 EXPORT_SYMBOL(obd_heat_add);
947 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
948 MODULE_DESCRIPTION("Lustre Class Driver");
949 MODULE_VERSION(LUSTRE_VERSION_STRING);
950 MODULE_LICENSE("GPL");
952 module_init(obdclass_init);
953 module_exit(obdclass_exit);