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LU-5319 ptlrpc: Add OBD_CONNECT_MULTIMODRPCS flag
[fs/lustre-release.git] / lustre / obdclass / lprocfs_status.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
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.
9  *
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).
15  *
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
19  *
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
22  * have any questions.
23  *
24  * GPL HEADER END
25  */
26 /*
27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
28  * Use is subject to license terms.
29  *
30  * Copyright (c) 2011, 2014, Intel Corporation.
31  */
32 /*
33  * This file is part of Lustre, http://www.lustre.org/
34  * Lustre is a trademark of Sun Microsystems, Inc.
35  *
36  * lustre/obdclass/lprocfs_status.c
37  *
38  * Author: Hariharan Thantry <thantry@users.sourceforge.net>
39  */
40
41 #define DEBUG_SUBSYSTEM S_CLASS
42
43 #include <obd_class.h>
44 #include <lprocfs_status.h>
45 #include <lustre/lustre_idl.h>
46
47 #ifdef CONFIG_PROC_FS
48
49 static int lprocfs_no_percpu_stats = 0;
50 CFS_MODULE_PARM(lprocfs_no_percpu_stats, "i", int, 0644,
51                 "Do not alloc percpu data for lprocfs stats");
52
53 #define MAX_STRING_SIZE 128
54
55 int lprocfs_single_release(struct inode *inode, struct file *file)
56 {
57         return single_release(inode, file);
58 }
59 EXPORT_SYMBOL(lprocfs_single_release);
60
61 int lprocfs_seq_release(struct inode *inode, struct file *file)
62 {
63         return seq_release(inode, file);
64 }
65 EXPORT_SYMBOL(lprocfs_seq_release);
66
67 struct proc_dir_entry *
68 lprocfs_add_simple(struct proc_dir_entry *root, char *name,
69                    void *data, const struct file_operations *fops)
70 {
71         struct proc_dir_entry *proc;
72         mode_t mode = 0;
73
74         if (root == NULL || name == NULL || fops == NULL)
75                 return ERR_PTR(-EINVAL);
76
77         if (fops->read)
78                 mode = 0444;
79         if (fops->write)
80                 mode |= 0200;
81         proc = proc_create_data(name, mode, root, fops, data);
82         if (!proc) {
83                 CERROR("LprocFS: No memory to create /proc entry %s\n",
84                        name);
85                 return ERR_PTR(-ENOMEM);
86         }
87         return proc;
88 }
89 EXPORT_SYMBOL(lprocfs_add_simple);
90
91 struct proc_dir_entry *lprocfs_add_symlink(const char *name,
92                         struct proc_dir_entry *parent, const char *format, ...)
93 {
94         struct proc_dir_entry *entry;
95         char *dest;
96         va_list ap;
97
98         if (parent == NULL || format == NULL)
99                 return NULL;
100
101         OBD_ALLOC_WAIT(dest, MAX_STRING_SIZE + 1);
102         if (dest == NULL)
103                 return NULL;
104
105         va_start(ap, format);
106         vsnprintf(dest, MAX_STRING_SIZE, format, ap);
107         va_end(ap);
108
109         entry = proc_symlink(name, parent, dest);
110         if (entry == NULL)
111                 CERROR("LprocFS: Could not create symbolic link from "
112                        "%s to %s\n", name, dest);
113
114         OBD_FREE(dest, MAX_STRING_SIZE + 1);
115         return entry;
116 }
117 EXPORT_SYMBOL(lprocfs_add_symlink);
118
119 static const struct file_operations lprocfs_generic_fops = { };
120
121 /**
122  * Add /proc entries.
123  *
124  * \param root [in]  The parent proc entry on which new entry will be added.
125  * \param list [in]  Array of proc entries to be added.
126  * \param data [in]  The argument to be passed when entries read/write routines
127  *                   are called through /proc file.
128  *
129  * \retval 0   on success
130  *         < 0 on error
131  */
132 int
133 lprocfs_add_vars(struct proc_dir_entry *root, struct lprocfs_vars *list,
134                  void *data)
135 {
136         if (root == NULL || list == NULL)
137                 return -EINVAL;
138
139         while (list->name != NULL) {
140                 struct proc_dir_entry *proc;
141                 mode_t mode = 0;
142
143                 if (list->proc_mode != 0000) {
144                         mode = list->proc_mode;
145                 } else if (list->fops) {
146                         if (list->fops->read)
147                                 mode = 0444;
148                         if (list->fops->write)
149                                 mode |= 0200;
150                 }
151                 proc = proc_create_data(list->name, mode, root,
152                                         list->fops ?: &lprocfs_generic_fops,
153                                         list->data ?: data);
154                 if (proc == NULL)
155                         return -ENOMEM;
156                 list++;
157         }
158         return 0;
159 }
160 EXPORT_SYMBOL(lprocfs_add_vars);
161
162 #ifndef HAVE_REMOVE_PROC_SUBTREE
163 /* for b=10866, global variable */
164 DECLARE_RWSEM(_lprocfs_lock);
165 EXPORT_SYMBOL(_lprocfs_lock);
166
167 static void lprocfs_remove_nolock(struct proc_dir_entry **proot)
168 {
169         struct proc_dir_entry *root = *proot;
170         struct proc_dir_entry *temp = root;
171         struct proc_dir_entry *rm_entry;
172         struct proc_dir_entry *parent;
173
174         *proot = NULL;
175         if (root == NULL || IS_ERR(root))
176                 return;
177
178         parent = root->parent;
179         LASSERT(parent != NULL);
180
181         while (1) {
182                 while (temp->subdir != NULL)
183                         temp = temp->subdir;
184
185                 rm_entry = temp;
186                 temp = temp->parent;
187
188                 /* Memory corruption once caused this to fail, and
189                    without this LASSERT we would loop here forever. */
190                 LASSERTF(strlen(rm_entry->name) == rm_entry->namelen,
191                          "0x%p  %s/%s len %d\n", rm_entry, temp->name,
192                          rm_entry->name, (int)strlen(rm_entry->name));
193
194                 remove_proc_entry(rm_entry->name, temp);
195                 if (temp == parent)
196                         break;
197         }
198 }
199
200 int remove_proc_subtree(const char *name, struct proc_dir_entry *parent)
201 {
202         struct proc_dir_entry    *t = NULL;
203         struct proc_dir_entry   **p;
204         int                       len, busy = 0;
205
206         LASSERT(parent != NULL);
207         len = strlen(name);
208
209         down_write(&_lprocfs_lock);
210         /* lookup target name */
211         for (p = &parent->subdir; *p; p = &(*p)->next) {
212                 if ((*p)->namelen != len)
213                         continue;
214                 if (memcmp(name, (*p)->name, len))
215                         continue;
216                 t = *p;
217                 break;
218         }
219
220         if (t) {
221                 /* verify it's empty: do not count "num_refs" */
222                 for (p = &t->subdir; *p; p = &(*p)->next) {
223                         if ((*p)->namelen != strlen("num_refs")) {
224                                 busy = 1;
225                                 break;
226                         }
227                         if (memcmp("num_refs", (*p)->name,
228                                    strlen("num_refs"))) {
229                                 busy = 1;
230                                 break;
231                         }
232                 }
233         }
234
235         if (busy == 0)
236                 lprocfs_remove_nolock(&t);
237
238         up_write(&_lprocfs_lock);
239         return 0;
240 }
241 #endif /* !HAVE_REMOVE_PROC_SUBTREE */
242
243 #ifndef HAVE_PROC_REMOVE
244 void proc_remove(struct proc_dir_entry *de)
245 {
246 #ifndef HAVE_REMOVE_PROC_SUBTREE
247         down_write(&_lprocfs_lock); /* search vs remove race */
248         lprocfs_remove_nolock(&de);
249         up_write(&_lprocfs_lock);
250 #else
251         if (de)
252                 remove_proc_subtree(de->name, de->parent);
253 #endif
254 }
255 #endif
256
257 void lprocfs_remove(struct proc_dir_entry **rooth)
258 {
259         proc_remove(*rooth);
260         *rooth = NULL;
261 }
262 EXPORT_SYMBOL(lprocfs_remove);
263
264 void lprocfs_remove_proc_entry(const char *name, struct proc_dir_entry *parent)
265 {
266         LASSERT(parent != NULL);
267         remove_proc_entry(name, parent);
268 }
269 EXPORT_SYMBOL(lprocfs_remove_proc_entry);
270
271 struct proc_dir_entry *
272 lprocfs_register(const char *name, struct proc_dir_entry *parent,
273                  struct lprocfs_vars *list, void *data)
274 {
275         struct proc_dir_entry *newchild;
276
277         newchild = proc_mkdir(name, parent);
278         if (newchild == NULL)
279                 return ERR_PTR(-ENOMEM);
280
281         if (list != NULL) {
282                 int rc = lprocfs_add_vars(newchild, list, data);
283                 if (rc) {
284                         lprocfs_remove(&newchild);
285                         return ERR_PTR(rc);
286                 }
287         }
288         return newchild;
289 }
290 EXPORT_SYMBOL(lprocfs_register);
291
292 /* Generic callbacks */
293 int lprocfs_uint_seq_show(struct seq_file *m, void *data)
294 {
295         return seq_printf(m, "%u\n", *(unsigned int *)data);
296 }
297 EXPORT_SYMBOL(lprocfs_uint_seq_show);
298
299 int lprocfs_wr_uint(struct file *file, const char __user *buffer,
300                     unsigned long count, void *data)
301 {
302         unsigned *p = data;
303         char dummy[MAX_STRING_SIZE + 1], *end;
304         unsigned long tmp;
305
306         dummy[MAX_STRING_SIZE] = '\0';
307         if (copy_from_user(dummy, buffer, MAX_STRING_SIZE))
308                 return -EFAULT;
309
310         tmp = simple_strtoul(dummy, &end, 0);
311         if (dummy == end)
312                 return -EINVAL;
313
314         *p = (unsigned int)tmp;
315         return count;
316 }
317 EXPORT_SYMBOL(lprocfs_wr_uint);
318
319 ssize_t lprocfs_uint_seq_write(struct file *file, const char __user *buffer,
320                                size_t count, loff_t *off)
321 {
322         int *data = ((struct seq_file *)file->private_data)->private;
323         int val = 0, rc;
324
325         rc = lprocfs_write_helper(buffer, count, &val);
326         if (rc < 0)
327                 return rc;
328
329         return lprocfs_wr_uint(file, buffer, count, data);
330 }
331 EXPORT_SYMBOL(lprocfs_uint_seq_write);
332
333 int lprocfs_u64_seq_show(struct seq_file *m, void *data)
334 {
335         LASSERT(data != NULL);
336         return seq_printf(m, LPU64"\n", *(__u64 *)data);
337 }
338 EXPORT_SYMBOL(lprocfs_u64_seq_show);
339
340 int lprocfs_atomic_seq_show(struct seq_file *m, void *data)
341 {
342         atomic_t *atom = data;
343         LASSERT(atom != NULL);
344         return seq_printf(m, "%d\n", atomic_read(atom));
345 }
346 EXPORT_SYMBOL(lprocfs_atomic_seq_show);
347
348 ssize_t
349 lprocfs_atomic_seq_write(struct file *file, const char __user *buffer,
350                         size_t count, loff_t *off)
351 {
352         atomic_t *atm = ((struct seq_file *)file->private_data)->private;
353         int val = 0;
354         int rc;
355
356         rc = lprocfs_write_helper(buffer, count, &val);
357         if (rc < 0)
358                 return rc;
359
360         if (val <= 0)
361                 return -ERANGE;
362
363         atomic_set(atm, val);
364         return count;
365 }
366 EXPORT_SYMBOL(lprocfs_atomic_seq_write);
367
368 int lprocfs_uuid_seq_show(struct seq_file *m, void *data)
369 {
370         struct obd_device *obd = data;
371
372         LASSERT(obd != NULL);
373         return seq_printf(m, "%s\n", obd->obd_uuid.uuid);
374 }
375 EXPORT_SYMBOL(lprocfs_uuid_seq_show);
376
377 int lprocfs_name_seq_show(struct seq_file *m, void *data)
378 {
379         struct obd_device *dev = data;
380
381         LASSERT(dev != NULL);
382         return seq_printf(m, "%s\n", dev->obd_name);
383 }
384 EXPORT_SYMBOL(lprocfs_name_seq_show);
385
386 int lprocfs_blksize_seq_show(struct seq_file *m, void *data)
387 {
388         struct obd_device *obd = data;
389         struct obd_statfs  osfs;
390         int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
391                             cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
392                             OBD_STATFS_NODELAY);
393         if (!rc)
394                 rc = seq_printf(m, "%u\n", osfs.os_bsize);
395         return rc;
396 }
397 EXPORT_SYMBOL(lprocfs_blksize_seq_show);
398
399 int lprocfs_kbytestotal_seq_show(struct seq_file *m, void *data)
400 {
401         struct obd_device *obd = data;
402         struct obd_statfs  osfs;
403         int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
404                             cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
405                             OBD_STATFS_NODELAY);
406         if (!rc) {
407                 __u32 blk_size = osfs.os_bsize >> 10;
408                 __u64 result = osfs.os_blocks;
409
410                 while (blk_size >>= 1)
411                         result <<= 1;
412
413                 rc = seq_printf(m, LPU64"\n", result);
414         }
415         return rc;
416 }
417 EXPORT_SYMBOL(lprocfs_kbytestotal_seq_show);
418
419 int lprocfs_kbytesfree_seq_show(struct seq_file *m, void *data)
420 {
421         struct obd_device *obd = data;
422         struct obd_statfs  osfs;
423         int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
424                             cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
425                             OBD_STATFS_NODELAY);
426         if (!rc) {
427                 __u32 blk_size = osfs.os_bsize >> 10;
428                 __u64 result = osfs.os_bfree;
429
430                 while (blk_size >>= 1)
431                         result <<= 1;
432
433                 rc = seq_printf(m, LPU64"\n", result);
434         }
435         return rc;
436 }
437 EXPORT_SYMBOL(lprocfs_kbytesfree_seq_show);
438
439 int lprocfs_kbytesavail_seq_show(struct seq_file *m, void *data)
440 {
441         struct obd_device *obd = data;
442         struct obd_statfs  osfs;
443         int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
444                             cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
445                             OBD_STATFS_NODELAY);
446         if (!rc) {
447                 __u32 blk_size = osfs.os_bsize >> 10;
448                 __u64 result = osfs.os_bavail;
449
450                 while (blk_size >>= 1)
451                         result <<= 1;
452
453                 rc = seq_printf(m, LPU64"\n", result);
454         }
455         return rc;
456 }
457 EXPORT_SYMBOL(lprocfs_kbytesavail_seq_show);
458
459 int lprocfs_filestotal_seq_show(struct seq_file *m, void *data)
460 {
461         struct obd_device *obd = data;
462         struct obd_statfs  osfs;
463         int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
464                             cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
465                             OBD_STATFS_NODELAY);
466         if (!rc)
467                 rc = seq_printf(m, LPU64"\n", osfs.os_files);
468         return rc;
469 }
470 EXPORT_SYMBOL(lprocfs_filestotal_seq_show);
471
472 int lprocfs_filesfree_seq_show(struct seq_file *m, void *data)
473 {
474         struct obd_device *obd = data;
475         struct obd_statfs  osfs;
476         int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
477                             cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
478                             OBD_STATFS_NODELAY);
479         if (!rc)
480                 rc = seq_printf(m, LPU64"\n", osfs.os_ffree);
481         return rc;
482 }
483 EXPORT_SYMBOL(lprocfs_filesfree_seq_show);
484
485 int lprocfs_server_uuid_seq_show(struct seq_file *m, void *data)
486 {
487         struct obd_device *obd = data;
488         struct obd_import *imp;
489         char *imp_state_name = NULL;
490         int rc = 0;
491
492         LASSERT(obd != NULL);
493         LPROCFS_CLIMP_CHECK(obd);
494         imp = obd->u.cli.cl_import;
495         imp_state_name = ptlrpc_import_state_name(imp->imp_state);
496         rc = seq_printf(m, "%s\t%s%s\n", obd2cli_tgt(obd), imp_state_name,
497                         imp->imp_deactive ? "\tDEACTIVATED" : "");
498
499         LPROCFS_CLIMP_EXIT(obd);
500         return rc;
501 }
502 EXPORT_SYMBOL(lprocfs_server_uuid_seq_show);
503
504 int lprocfs_conn_uuid_seq_show(struct seq_file *m, void *data)
505 {
506         struct obd_device *obd = data;
507         struct ptlrpc_connection *conn;
508         int rc = 0;
509
510         LASSERT(obd != NULL);
511
512         LPROCFS_CLIMP_CHECK(obd);
513         conn = obd->u.cli.cl_import->imp_connection;
514         if (conn && obd->u.cli.cl_import)
515                 rc = seq_printf(m, "%s\n", conn->c_remote_uuid.uuid);
516         else
517                 rc = seq_printf(m, "%s\n", "<none>");
518
519         LPROCFS_CLIMP_EXIT(obd);
520         return rc;
521 }
522 EXPORT_SYMBOL(lprocfs_conn_uuid_seq_show);
523
524 /** add up per-cpu counters */
525 void lprocfs_stats_collect(struct lprocfs_stats *stats, int idx,
526                            struct lprocfs_counter *cnt)
527 {
528         unsigned int                    num_entry;
529         struct lprocfs_counter          *percpu_cntr;
530         int                             i;
531         unsigned long                   flags = 0;
532
533         memset(cnt, 0, sizeof(*cnt));
534
535         if (stats == NULL) {
536                 /* set count to 1 to avoid divide-by-zero errs in callers */
537                 cnt->lc_count = 1;
538                 return;
539         }
540
541         cnt->lc_min = LC_MIN_INIT;
542
543         num_entry = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
544
545         for (i = 0; i < num_entry; i++) {
546                 if (stats->ls_percpu[i] == NULL)
547                         continue;
548                 percpu_cntr = lprocfs_stats_counter_get(stats, i, idx);
549
550                 cnt->lc_count += percpu_cntr->lc_count;
551                 cnt->lc_sum += percpu_cntr->lc_sum;
552                 if (percpu_cntr->lc_min < cnt->lc_min)
553                         cnt->lc_min = percpu_cntr->lc_min;
554                 if (percpu_cntr->lc_max > cnt->lc_max)
555                         cnt->lc_max = percpu_cntr->lc_max;
556                 cnt->lc_sumsquare += percpu_cntr->lc_sumsquare;
557         }
558
559         lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
560 }
561
562 /**
563  * Append a space separated list of current set flags to str.
564  */
565 #define flag2str(flag)                                          \
566         do {                                                            \
567                 if (imp->imp_##flag) {                                  \
568                         seq_printf(m, "%s" #flag, first ? "" : ", ");   \
569                         first = false;                                  \
570                 }                                                       \
571         } while (0)
572 static void obd_import_flags2str(struct obd_import *imp, struct seq_file *m)
573 {
574         bool first = true;
575
576         if (imp->imp_obd->obd_no_recov) {
577                 seq_printf(m, "no_recov");
578                 first = false;
579         }
580
581         flag2str(invalid);
582         flag2str(deactive);
583         flag2str(replayable);
584         flag2str(delayed_recovery);
585         flag2str(no_lock_replay);
586         flag2str(vbr_failed);
587         flag2str(pingable);
588         flag2str(resend_replay);
589         flag2str(no_pinger_recover);
590         flag2str(need_mne_swab);
591         flag2str(connect_tried);
592 }
593 #undef flag2str
594
595 static const char *obd_connect_names[] = {
596         "read_only",
597         "lov_index",
598         "connect_from_mds",
599         "write_grant",
600         "server_lock",
601         "version",
602         "request_portal",
603         "acl",
604         "xattr",
605         "create_on_write",
606         "truncate_lock",
607         "initial_transno",
608         "inode_bit_locks",
609         "join_file(obsolete)",
610         "getattr_by_fid",
611         "no_oh_for_devices",
612         "remote_client",
613         "remote_client_by_force",
614         "max_byte_per_rpc",
615         "64bit_qdata",
616         "mds_capability",
617         "oss_capability",
618         "early_lock_cancel",
619         "som",
620         "adaptive_timeouts",
621         "lru_resize",
622         "mds_mds_connection",
623         "real_conn",
624         "change_qunit_size",
625         "alt_checksum_algorithm",
626         "fid_is_enabled",
627         "version_recovery",
628         "pools",
629         "grant_shrink",
630         "skip_orphan",
631         "large_ea",
632         "full20",
633         "layout_lock",
634         "64bithash",
635         "object_max_bytes",
636         "imp_recov",
637         "jobstats",
638         "umask",
639         "einprogress",
640         "grant_param",
641         "flock_owner",
642         "lvb_type",
643         "nanoseconds_times",
644         "lightweight_conn",
645         "short_io",
646         "pingless",
647         "flock_deadlock",
648         "disp_stripe",
649         "open_by_fid",
650         "lfsck",
651         "unknown",
652         "unlink_close",
653         "multi_mod_rpcs",
654         "dir_stripe",
655         "unknown",
656         NULL
657 };
658
659 static void obd_connect_seq_flags2str(struct seq_file *m, __u64 flags, char *sep)
660 {
661         bool first = true;
662         __u64 mask = 1;
663         int i;
664
665         for (i = 0; obd_connect_names[i] != NULL; i++, mask <<= 1) {
666                 if (flags & mask) {
667                         seq_printf(m, "%s%s",
668                                    first ? "" : sep, obd_connect_names[i]);
669                         first = false;
670                 }
671         }
672         if (flags & ~(mask - 1))
673                 seq_printf(m, "%sunknown_"LPX64,
674                            first ? "" : sep, flags & ~(mask - 1));
675 }
676
677 int obd_connect_flags2str(char *page, int count, __u64 flags, char *sep)
678 {
679         __u64 mask = 1;
680         int i, ret = 0;
681
682         for (i = 0; obd_connect_names[i] != NULL; i++, mask <<= 1) {
683                 if (flags & mask)
684                         ret += snprintf(page + ret, count - ret, "%s%s",
685                                         ret ? sep : "", obd_connect_names[i]);
686         }
687         if (flags & ~(mask - 1))
688                 ret += snprintf(page + ret, count - ret,
689                                 "%sunknown_"LPX64,
690                                 ret ? sep : "", flags & ~(mask - 1));
691         return ret;
692 }
693 EXPORT_SYMBOL(obd_connect_flags2str);
694
695 static void obd_connect_data_seqprint(struct seq_file *m,
696                                       struct obd_connect_data *ocd)
697 {
698         __u64 flags;
699
700         LASSERT(ocd != NULL);
701         flags = ocd->ocd_connect_flags;
702
703         seq_printf(m, "    connect_data:\n"
704                       "       flags: "LPX64"\n"
705                       "       instance: %u\n",
706                       ocd->ocd_connect_flags,
707                       ocd->ocd_instance);
708         if (flags & OBD_CONNECT_VERSION)
709                 seq_printf(m, "       target_version: %u.%u.%u.%u\n",
710                               OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
711                               OBD_OCD_VERSION_MINOR(ocd->ocd_version),
712                               OBD_OCD_VERSION_PATCH(ocd->ocd_version),
713                               OBD_OCD_VERSION_FIX(ocd->ocd_version));
714         if (flags & OBD_CONNECT_MDS)
715                 seq_printf(m, "       mdt_index: %d\n", ocd->ocd_group);
716         if (flags & OBD_CONNECT_GRANT)
717                 seq_printf(m, "       initial_grant: %d\n", ocd->ocd_grant);
718         if (flags & OBD_CONNECT_INDEX)
719                 seq_printf(m, "       target_index: %u\n", ocd->ocd_index);
720         if (flags & OBD_CONNECT_BRW_SIZE)
721                 seq_printf(m, "       max_brw_size: %d\n", ocd->ocd_brw_size);
722         if (flags & OBD_CONNECT_IBITS)
723                 seq_printf(m, "       ibits_known: "LPX64"\n",
724                                 ocd->ocd_ibits_known);
725         if (flags & OBD_CONNECT_GRANT_PARAM)
726                 seq_printf(m, "       grant_block_size: %d\n"
727                               "       grant_inode_size: %d\n"
728                               "       grant_extent_overhead: %d\n",
729                               ocd->ocd_blocksize,
730                               ocd->ocd_inodespace,
731                               ocd->ocd_grant_extent);
732         if (flags & OBD_CONNECT_TRANSNO)
733                 seq_printf(m, "       first_transno: "LPX64"\n",
734                                 ocd->ocd_transno);
735         if (flags & OBD_CONNECT_CKSUM)
736                 seq_printf(m, "       cksum_types: %#x\n",
737                               ocd->ocd_cksum_types);
738         if (flags & OBD_CONNECT_MAX_EASIZE)
739                 seq_printf(m, "       max_easize: %d\n", ocd->ocd_max_easize);
740         if (flags & OBD_CONNECT_MAXBYTES)
741                 seq_printf(m, "       max_object_bytes: "LPU64"\n",
742                               ocd->ocd_maxbytes);
743         if (flags & OBD_CONNECT_MULTIMODRPCS)
744                 seq_printf(m, "       max_mod_rpcs: %hu\n",
745                               ocd->ocd_maxmodrpcs);
746 }
747
748 int lprocfs_import_seq_show(struct seq_file *m, void *data)
749 {
750         char                            nidstr[LNET_NIDSTR_SIZE];
751         struct lprocfs_counter          ret;
752         struct lprocfs_counter_header   *header;
753         struct obd_device               *obd    = (struct obd_device *)data;
754         struct obd_import               *imp;
755         struct obd_import_conn          *conn;
756         struct obd_connect_data         *ocd;
757         int                             j;
758         int                             k;
759         int                             rw      = 0;
760
761         LASSERT(obd != NULL);
762         LPROCFS_CLIMP_CHECK(obd);
763         imp = obd->u.cli.cl_import;
764         ocd = &imp->imp_connect_data;
765
766         seq_printf(m, "import:\n"
767                       "    name: %s\n"
768                       "    target: %s\n"
769                       "    state: %s\n"
770                       "    connect_flags: [ ",
771                       obd->obd_name,
772                       obd2cli_tgt(obd),
773                       ptlrpc_import_state_name(imp->imp_state));
774         obd_connect_seq_flags2str(m, imp->imp_connect_data.ocd_connect_flags,
775                                         ", ");
776         seq_printf(m, " ]\n");
777         obd_connect_data_seqprint(m, ocd);
778         seq_printf(m, "    import_flags: [ ");
779         obd_import_flags2str(imp, m);
780
781         seq_printf(m, " ]\n"
782                       "    connection:\n"
783                       "       failover_nids: [ ");
784         spin_lock(&imp->imp_lock);
785         j = 0;
786         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
787                 libcfs_nid2str_r(conn->oic_conn->c_peer.nid,
788                                  nidstr, sizeof(nidstr));
789                 seq_printf(m, "%s%s", j ? ", " : "", nidstr);
790                 j++;
791         }
792         libcfs_nid2str_r(imp->imp_connection->c_peer.nid,
793                          nidstr, sizeof(nidstr));
794         seq_printf(m, " ]\n"
795                       "       current_connection: %s\n"
796                       "       connection_attempts: %u\n"
797                       "       generation: %u\n"
798                       "       in-progress_invalidations: %u\n",
799                       imp->imp_connection == NULL ? "<none>" : nidstr,
800                       imp->imp_conn_cnt,
801                       imp->imp_generation,
802                       atomic_read(&imp->imp_inval_count));
803         spin_unlock(&imp->imp_lock);
804
805         if (obd->obd_svc_stats == NULL)
806                 goto out_climp;
807
808         header = &obd->obd_svc_stats->ls_cnt_header[PTLRPC_REQWAIT_CNTR];
809         lprocfs_stats_collect(obd->obd_svc_stats, PTLRPC_REQWAIT_CNTR, &ret);
810         if (ret.lc_count != 0) {
811                 /* first argument to do_div MUST be __u64 */
812                 __u64 sum = ret.lc_sum;
813                 do_div(sum, ret.lc_count);
814                 ret.lc_sum = sum;
815         } else
816                 ret.lc_sum = 0;
817         seq_printf(m, "    rpcs:\n"
818                       "       inflight: %u\n"
819                       "       unregistering: %u\n"
820                       "       timeouts: %u\n"
821                       "       avg_waittime: "LPU64" %s\n",
822                       atomic_read(&imp->imp_inflight),
823                       atomic_read(&imp->imp_unregistering),
824                       atomic_read(&imp->imp_timeouts),
825                       ret.lc_sum, header->lc_units);
826
827         k = 0;
828         for(j = 0; j < IMP_AT_MAX_PORTALS; j++) {
829                 if (imp->imp_at.iat_portal[j] == 0)
830                         break;
831                 k = max_t(unsigned int, k,
832                           at_get(&imp->imp_at.iat_service_estimate[j]));
833         }
834         seq_printf(m, "    service_estimates:\n"
835                       "       services: %u sec\n"
836                       "       network: %u sec\n",
837                       k,
838                       at_get(&imp->imp_at.iat_net_latency));
839
840         seq_printf(m, "    transactions:\n"
841                       "       last_replay: "LPU64"\n"
842                       "       peer_committed: "LPU64"\n"
843                       "       last_checked: "LPU64"\n",
844                       imp->imp_last_replay_transno,
845                       imp->imp_peer_committed_transno,
846                       imp->imp_last_transno_checked);
847
848         /* avg data rates */
849         for (rw = 0; rw <= 1; rw++) {
850                 lprocfs_stats_collect(obd->obd_svc_stats,
851                                       PTLRPC_LAST_CNTR + BRW_READ_BYTES + rw,
852                                       &ret);
853                 if (ret.lc_sum > 0 && ret.lc_count > 0) {
854                         /* first argument to do_div MUST be __u64 */
855                         __u64 sum = ret.lc_sum;
856                         do_div(sum, ret.lc_count);
857                         ret.lc_sum = sum;
858                         seq_printf(m, "    %s_data_averages:\n"
859                                       "       bytes_per_rpc: "LPU64"\n",
860                                       rw ? "write" : "read",
861                                       ret.lc_sum);
862                 }
863                 k = (int)ret.lc_sum;
864                 j = opcode_offset(OST_READ + rw) + EXTRA_MAX_OPCODES;
865                 header = &obd->obd_svc_stats->ls_cnt_header[j];
866                 lprocfs_stats_collect(obd->obd_svc_stats, j, &ret);
867                 if (ret.lc_sum > 0 && ret.lc_count != 0) {
868                         /* first argument to do_div MUST be __u64 */
869                         __u64 sum = ret.lc_sum;
870                         do_div(sum, ret.lc_count);
871                         ret.lc_sum = sum;
872                         seq_printf(m, "       %s_per_rpc: "LPU64"\n",
873                                         header->lc_units, ret.lc_sum);
874                         j = (int)ret.lc_sum;
875                         if (j > 0)
876                                 seq_printf(m, "       MB_per_sec: %u.%.02u\n",
877                                                 k / j, (100 * k / j) % 100);
878                 }
879         }
880
881 out_climp:
882         LPROCFS_CLIMP_EXIT(obd);
883         return 0;
884 }
885 EXPORT_SYMBOL(lprocfs_import_seq_show);
886
887 int lprocfs_state_seq_show(struct seq_file *m, void *data)
888 {
889         struct obd_device *obd = (struct obd_device *)data;
890         struct obd_import *imp;
891         int j, k;
892
893         LASSERT(obd != NULL);
894         LPROCFS_CLIMP_CHECK(obd);
895         imp = obd->u.cli.cl_import;
896
897         seq_printf(m, "current_state: %s\n",
898                    ptlrpc_import_state_name(imp->imp_state));
899         seq_printf(m, "state_history:\n");
900         k = imp->imp_state_hist_idx;
901         for (j = 0; j < IMP_STATE_HIST_LEN; j++) {
902                 struct import_state_hist *ish =
903                         &imp->imp_state_hist[(k + j) % IMP_STATE_HIST_LEN];
904                 if (ish->ish_state == 0)
905                         continue;
906                 seq_printf(m, " - [ "CFS_TIME_T", %s ]\n",
907                            ish->ish_time,
908                 ptlrpc_import_state_name(ish->ish_state));
909         }
910
911         LPROCFS_CLIMP_EXIT(obd);
912         return 0;
913 }
914 EXPORT_SYMBOL(lprocfs_state_seq_show);
915
916 int lprocfs_at_hist_helper(struct seq_file *m, struct adaptive_timeout *at)
917 {
918         int i;
919         for (i = 0; i < AT_BINS; i++)
920                 seq_printf(m, "%3u ", at->at_hist[i]);
921         seq_printf(m, "\n");
922         return 0;
923 }
924 EXPORT_SYMBOL(lprocfs_at_hist_helper);
925
926 /* See also ptlrpc_lprocfs_timeouts_show_seq */
927 int lprocfs_timeouts_seq_show(struct seq_file *m, void *data)
928 {
929         struct obd_device *obd = (struct obd_device *)data;
930         struct obd_import *imp;
931         unsigned int cur, worst;
932         time_t now, worstt;
933         struct dhms ts;
934         int i;
935
936         LASSERT(obd != NULL);
937         LPROCFS_CLIMP_CHECK(obd);
938         imp = obd->u.cli.cl_import;
939
940         now = cfs_time_current_sec();
941
942         /* Some network health info for kicks */
943         s2dhms(&ts, now - imp->imp_last_reply_time);
944         seq_printf(m, "%-10s : %ld, "DHMS_FMT" ago\n",
945                    "last reply", imp->imp_last_reply_time, DHMS_VARS(&ts));
946
947         cur = at_get(&imp->imp_at.iat_net_latency);
948         worst = imp->imp_at.iat_net_latency.at_worst_ever;
949         worstt = imp->imp_at.iat_net_latency.at_worst_time;
950         s2dhms(&ts, now - worstt);
951         seq_printf(m, "%-10s : cur %3u  worst %3u (at %ld, "DHMS_FMT" ago) ",
952                    "network", cur, worst, worstt, DHMS_VARS(&ts));
953         lprocfs_at_hist_helper(m, &imp->imp_at.iat_net_latency);
954
955         for(i = 0; i < IMP_AT_MAX_PORTALS; i++) {
956                 if (imp->imp_at.iat_portal[i] == 0)
957                         break;
958                 cur = at_get(&imp->imp_at.iat_service_estimate[i]);
959                 worst = imp->imp_at.iat_service_estimate[i].at_worst_ever;
960                 worstt = imp->imp_at.iat_service_estimate[i].at_worst_time;
961                 s2dhms(&ts, now - worstt);
962                 seq_printf(m, "portal %-2d  : cur %3u  worst %3u (at %ld, "
963                            DHMS_FMT" ago) ", imp->imp_at.iat_portal[i],
964                            cur, worst, worstt, DHMS_VARS(&ts));
965                 lprocfs_at_hist_helper(m, &imp->imp_at.iat_service_estimate[i]);
966         }
967
968         LPROCFS_CLIMP_EXIT(obd);
969         return 0;
970 }
971 EXPORT_SYMBOL(lprocfs_timeouts_seq_show);
972
973 int lprocfs_connect_flags_seq_show(struct seq_file *m, void *data)
974 {
975         struct obd_device *obd = data;
976         __u64 flags;
977
978         LPROCFS_CLIMP_CHECK(obd);
979         flags = obd->u.cli.cl_import->imp_connect_data.ocd_connect_flags;
980         seq_printf(m, "flags="LPX64"\n", flags);
981         obd_connect_seq_flags2str(m, flags, "\n");
982         seq_printf(m, "\n");
983         LPROCFS_CLIMP_EXIT(obd);
984         return 0;
985 }
986 EXPORT_SYMBOL(lprocfs_connect_flags_seq_show);
987
988 int
989 lprocfs_obd_setup(struct obd_device *obd)
990 {
991         int rc = 0;
992
993         LASSERT(obd != NULL);
994         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
995         LASSERT(obd->obd_type->typ_procroot != NULL);
996
997         obd->obd_proc_entry = lprocfs_register(obd->obd_name,
998                                                obd->obd_type->typ_procroot,
999                                                obd->obd_vars, obd);
1000         if (IS_ERR(obd->obd_proc_entry)) {
1001                 rc = PTR_ERR(obd->obd_proc_entry);
1002                 CERROR("error %d setting up lprocfs for %s\n",rc,obd->obd_name);
1003                 obd->obd_proc_entry = NULL;
1004         }
1005         return rc;
1006 }
1007 EXPORT_SYMBOL(lprocfs_obd_setup);
1008
1009 int lprocfs_obd_cleanup(struct obd_device *obd)
1010 {
1011         if (!obd)
1012                 return -EINVAL;
1013         if (obd->obd_proc_exports_entry) {
1014                 /* Should be no exports left */
1015                 lprocfs_remove(&obd->obd_proc_exports_entry);
1016                 obd->obd_proc_exports_entry = NULL;
1017         }
1018         if (obd->obd_proc_entry) {
1019                 lprocfs_remove(&obd->obd_proc_entry);
1020                 obd->obd_proc_entry = NULL;
1021         }
1022         return 0;
1023 }
1024 EXPORT_SYMBOL(lprocfs_obd_cleanup);
1025
1026 int lprocfs_stats_alloc_one(struct lprocfs_stats *stats, unsigned int cpuid)
1027 {
1028         struct lprocfs_counter  *cntr;
1029         unsigned int            percpusize;
1030         int                     rc = -ENOMEM;
1031         unsigned long           flags = 0;
1032         int                     i;
1033
1034         LASSERT(stats->ls_percpu[cpuid] == NULL);
1035         LASSERT((stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU) == 0);
1036
1037         percpusize = lprocfs_stats_counter_size(stats);
1038         LIBCFS_ALLOC_ATOMIC(stats->ls_percpu[cpuid], percpusize);
1039         if (stats->ls_percpu[cpuid] != NULL) {
1040                 rc = 0;
1041                 if (unlikely(stats->ls_biggest_alloc_num <= cpuid)) {
1042                         if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
1043                                 spin_lock_irqsave(&stats->ls_lock, flags);
1044                         else
1045                                 spin_lock(&stats->ls_lock);
1046                         if (stats->ls_biggest_alloc_num <= cpuid)
1047                                 stats->ls_biggest_alloc_num = cpuid + 1;
1048                         if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) {
1049                                 spin_unlock_irqrestore(&stats->ls_lock, flags);
1050                         } else {
1051                                 spin_unlock(&stats->ls_lock);
1052                         }
1053                 }
1054                 /* initialize the ls_percpu[cpuid] non-zero counter */
1055                 for (i = 0; i < stats->ls_num; ++i) {
1056                         cntr = lprocfs_stats_counter_get(stats, cpuid, i);
1057                         cntr->lc_min = LC_MIN_INIT;
1058                 }
1059         }
1060         return rc;
1061 }
1062
1063 struct lprocfs_stats *lprocfs_alloc_stats(unsigned int num,
1064                                           enum lprocfs_stats_flags flags)
1065 {
1066         struct lprocfs_stats    *stats;
1067         unsigned int            num_entry;
1068         unsigned int            percpusize = 0;
1069         int                     i;
1070
1071         if (num == 0)
1072                 return NULL;
1073
1074         if (lprocfs_no_percpu_stats != 0)
1075                 flags |= LPROCFS_STATS_FLAG_NOPERCPU;
1076
1077         if (flags & LPROCFS_STATS_FLAG_NOPERCPU)
1078                 num_entry = 1;
1079         else
1080                 num_entry = num_possible_cpus();
1081
1082         /* alloc percpu pointers for all possible cpu slots */
1083         LIBCFS_ALLOC(stats, offsetof(typeof(*stats), ls_percpu[num_entry]));
1084         if (stats == NULL)
1085                 return NULL;
1086
1087         stats->ls_num = num;
1088         stats->ls_flags = flags;
1089         spin_lock_init(&stats->ls_lock);
1090
1091         /* alloc num of counter headers */
1092         LIBCFS_ALLOC(stats->ls_cnt_header,
1093                      stats->ls_num * sizeof(struct lprocfs_counter_header));
1094         if (stats->ls_cnt_header == NULL)
1095                 goto fail;
1096
1097         if ((flags & LPROCFS_STATS_FLAG_NOPERCPU) != 0) {
1098                 /* contains only one set counters */
1099                 percpusize = lprocfs_stats_counter_size(stats);
1100                 LIBCFS_ALLOC_ATOMIC(stats->ls_percpu[0], percpusize);
1101                 if (stats->ls_percpu[0] == NULL)
1102                         goto fail;
1103                 stats->ls_biggest_alloc_num = 1;
1104         } else if ((flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0) {
1105                 /* alloc all percpu data, currently only obd_memory use this */
1106                 for (i = 0; i < num_entry; ++i)
1107                         if (lprocfs_stats_alloc_one(stats, i) < 0)
1108                                 goto fail;
1109         }
1110
1111         return stats;
1112
1113 fail:
1114         lprocfs_free_stats(&stats);
1115         return NULL;
1116 }
1117 EXPORT_SYMBOL(lprocfs_alloc_stats);
1118
1119 void lprocfs_free_stats(struct lprocfs_stats **statsh)
1120 {
1121         struct lprocfs_stats *stats = *statsh;
1122         unsigned int num_entry;
1123         unsigned int percpusize;
1124         unsigned int i;
1125
1126         if (stats == NULL || stats->ls_num == 0)
1127                 return;
1128         *statsh = NULL;
1129
1130         if (stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU)
1131                 num_entry = 1;
1132         else
1133                 num_entry = num_possible_cpus();
1134
1135         percpusize = lprocfs_stats_counter_size(stats);
1136         for (i = 0; i < num_entry; i++)
1137                 if (stats->ls_percpu[i] != NULL)
1138                         LIBCFS_FREE(stats->ls_percpu[i], percpusize);
1139         if (stats->ls_cnt_header != NULL)
1140                 LIBCFS_FREE(stats->ls_cnt_header, stats->ls_num *
1141                                         sizeof(struct lprocfs_counter_header));
1142         LIBCFS_FREE(stats, offsetof(typeof(*stats), ls_percpu[num_entry]));
1143 }
1144 EXPORT_SYMBOL(lprocfs_free_stats);
1145
1146 void lprocfs_clear_stats(struct lprocfs_stats *stats)
1147 {
1148         struct lprocfs_counter          *percpu_cntr;
1149         int                             i;
1150         int                             j;
1151         unsigned int                    num_entry;
1152         unsigned long                   flags = 0;
1153
1154         num_entry = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
1155
1156         for (i = 0; i < num_entry; i++) {
1157                 if (stats->ls_percpu[i] == NULL)
1158                         continue;
1159                 for (j = 0; j < stats->ls_num; j++) {
1160                         percpu_cntr = lprocfs_stats_counter_get(stats, i, j);
1161                         percpu_cntr->lc_count           = 0;
1162                         percpu_cntr->lc_min             = LC_MIN_INIT;
1163                         percpu_cntr->lc_max             = 0;
1164                         percpu_cntr->lc_sumsquare       = 0;
1165                         percpu_cntr->lc_sum             = 0;
1166                         if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
1167                                 percpu_cntr->lc_sum_irq = 0;
1168                 }
1169         }
1170
1171         lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
1172 }
1173 EXPORT_SYMBOL(lprocfs_clear_stats);
1174
1175 static ssize_t lprocfs_stats_seq_write(struct file *file,
1176                                        const char __user *buf,
1177                                        size_t len, loff_t *off)
1178 {
1179         struct seq_file *seq = file->private_data;
1180         struct lprocfs_stats *stats = seq->private;
1181
1182         lprocfs_clear_stats(stats);
1183
1184         return len;
1185 }
1186
1187 static void *lprocfs_stats_seq_start(struct seq_file *p, loff_t *pos)
1188 {
1189         struct lprocfs_stats *stats = p->private;
1190
1191         return (*pos < stats->ls_num) ? pos : NULL;
1192 }
1193
1194 static void lprocfs_stats_seq_stop(struct seq_file *p, void *v)
1195 {
1196 }
1197
1198 static void *lprocfs_stats_seq_next(struct seq_file *p, void *v, loff_t *pos)
1199 {
1200         (*pos)++;
1201
1202         return lprocfs_stats_seq_start(p, pos);
1203 }
1204
1205 /* seq file export of one lprocfs counter */
1206 static int lprocfs_stats_seq_show(struct seq_file *p, void *v)
1207 {
1208         struct lprocfs_stats            *stats  = p->private;
1209         struct lprocfs_counter_header   *hdr;
1210         struct lprocfs_counter           ctr;
1211         int                              idx    = *(loff_t *)v;
1212         int                              rc     = 0;
1213
1214         if (idx == 0) {
1215                 struct timeval now;
1216
1217                 do_gettimeofday(&now);
1218                 rc = seq_printf(p, "%-25s %lu.%lu secs.usecs\n",
1219                                 "snapshot_time", now.tv_sec, now.tv_usec);
1220                 if (rc < 0)
1221                         return rc;
1222         }
1223
1224         hdr = &stats->ls_cnt_header[idx];
1225         lprocfs_stats_collect(stats, idx, &ctr);
1226
1227         if (ctr.lc_count == 0)
1228                 goto out;
1229
1230         rc = seq_printf(p, "%-25s "LPD64" samples [%s]", hdr->lc_name,
1231                         ctr.lc_count, hdr->lc_units);
1232         if (rc < 0)
1233                 goto out;
1234
1235         if ((hdr->lc_config & LPROCFS_CNTR_AVGMINMAX) && ctr.lc_count > 0) {
1236                 rc = seq_printf(p, " "LPD64" "LPD64" "LPD64,
1237                                 ctr.lc_min, ctr.lc_max, ctr.lc_sum);
1238                 if (rc < 0)
1239                         goto out;
1240                 if (hdr->lc_config & LPROCFS_CNTR_STDDEV)
1241                         rc = seq_printf(p, " "LPD64, ctr.lc_sumsquare);
1242                 if (rc < 0)
1243                         goto out;
1244         }
1245         rc = seq_printf(p, "\n");
1246 out:
1247         return (rc < 0) ? rc : 0;
1248 }
1249
1250 static const struct seq_operations lprocfs_stats_seq_sops = {
1251         .start  = lprocfs_stats_seq_start,
1252         .stop   = lprocfs_stats_seq_stop,
1253         .next   = lprocfs_stats_seq_next,
1254         .show   = lprocfs_stats_seq_show,
1255 };
1256
1257 static int lprocfs_stats_seq_open(struct inode *inode, struct file *file)
1258 {
1259         struct seq_file *seq;
1260         int rc;
1261
1262         rc = LPROCFS_ENTRY_CHECK(inode);
1263         if (rc < 0)
1264                 return rc;
1265
1266         rc = seq_open(file, &lprocfs_stats_seq_sops);
1267         if (rc)
1268                 return rc;
1269         seq = file->private_data;
1270         seq->private = PDE_DATA(inode);
1271         return 0;
1272 }
1273
1274 static const struct file_operations lprocfs_stats_seq_fops = {
1275         .owner   = THIS_MODULE,
1276         .open    = lprocfs_stats_seq_open,
1277         .read    = seq_read,
1278         .write   = lprocfs_stats_seq_write,
1279         .llseek  = seq_lseek,
1280         .release = lprocfs_seq_release,
1281 };
1282
1283 int lprocfs_register_stats(struct proc_dir_entry *root, const char *name,
1284                            struct lprocfs_stats *stats)
1285 {
1286         struct proc_dir_entry *entry;
1287         LASSERT(root != NULL);
1288
1289         entry = proc_create_data(name, 0644, root,
1290                                  &lprocfs_stats_seq_fops, stats);
1291         if (entry == NULL)
1292                 return -ENOMEM;
1293         return 0;
1294 }
1295 EXPORT_SYMBOL(lprocfs_register_stats);
1296
1297 void lprocfs_counter_init(struct lprocfs_stats *stats, int index,
1298                           unsigned conf, const char *name, const char *units)
1299 {
1300         struct lprocfs_counter_header   *header;
1301         struct lprocfs_counter          *percpu_cntr;
1302         unsigned long                   flags = 0;
1303         unsigned int                    i;
1304         unsigned int                    num_cpu;
1305
1306         LASSERT(stats != NULL);
1307
1308         header = &stats->ls_cnt_header[index];
1309         LASSERTF(header != NULL, "Failed to allocate stats header:[%d]%s/%s\n",
1310                  index, name, units);
1311
1312         header->lc_config = conf;
1313         header->lc_name   = name;
1314         header->lc_units  = units;
1315
1316         num_cpu = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
1317         for (i = 0; i < num_cpu; ++i) {
1318                 if (stats->ls_percpu[i] == NULL)
1319                         continue;
1320                 percpu_cntr = lprocfs_stats_counter_get(stats, i, index);
1321                 percpu_cntr->lc_count           = 0;
1322                 percpu_cntr->lc_min             = LC_MIN_INIT;
1323                 percpu_cntr->lc_max             = 0;
1324                 percpu_cntr->lc_sumsquare       = 0;
1325                 percpu_cntr->lc_sum             = 0;
1326                 if ((stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
1327                         percpu_cntr->lc_sum_irq = 0;
1328         }
1329         lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
1330 }
1331 EXPORT_SYMBOL(lprocfs_counter_init);
1332
1333 /* Note that we only init md counters for ops whose offset is less
1334  * than NUM_MD_STATS. This is explained in a comment in the definition
1335  * of struct md_ops. */
1336 #define LPROCFS_MD_OP_INIT(base, stats, op)                                    \
1337         do {                                                                   \
1338                 unsigned int _idx = base + MD_COUNTER_OFFSET(op);              \
1339                                                                                \
1340                 if (MD_COUNTER_OFFSET(op) < NUM_MD_STATS) {                    \
1341                         LASSERT(_idx < stats->ls_num);                         \
1342                         lprocfs_counter_init(stats, _idx, 0, #op, "reqs");     \
1343                 }                                                              \
1344         } while (0)
1345
1346 void lprocfs_init_mps_stats(int num_private_stats, struct lprocfs_stats *stats)
1347 {
1348         LPROCFS_MD_OP_INIT(num_private_stats, stats, getstatus);
1349         LPROCFS_MD_OP_INIT(num_private_stats, stats, null_inode);
1350         LPROCFS_MD_OP_INIT(num_private_stats, stats, find_cbdata);
1351         LPROCFS_MD_OP_INIT(num_private_stats, stats, close);
1352         LPROCFS_MD_OP_INIT(num_private_stats, stats, create);
1353         LPROCFS_MD_OP_INIT(num_private_stats, stats, enqueue);
1354         LPROCFS_MD_OP_INIT(num_private_stats, stats, getattr);
1355         LPROCFS_MD_OP_INIT(num_private_stats, stats, getattr_name);
1356         LPROCFS_MD_OP_INIT(num_private_stats, stats, intent_lock);
1357         LPROCFS_MD_OP_INIT(num_private_stats, stats, link);
1358         LPROCFS_MD_OP_INIT(num_private_stats, stats, rename);
1359         LPROCFS_MD_OP_INIT(num_private_stats, stats, setattr);
1360         LPROCFS_MD_OP_INIT(num_private_stats, stats, fsync);
1361         LPROCFS_MD_OP_INIT(num_private_stats, stats, read_page);
1362         LPROCFS_MD_OP_INIT(num_private_stats, stats, unlink);
1363         LPROCFS_MD_OP_INIT(num_private_stats, stats, setxattr);
1364         LPROCFS_MD_OP_INIT(num_private_stats, stats, getxattr);
1365         LPROCFS_MD_OP_INIT(num_private_stats, stats, init_ea_size);
1366         LPROCFS_MD_OP_INIT(num_private_stats, stats, get_lustre_md);
1367         LPROCFS_MD_OP_INIT(num_private_stats, stats, free_lustre_md);
1368         LPROCFS_MD_OP_INIT(num_private_stats, stats, merge_attr);
1369         LPROCFS_MD_OP_INIT(num_private_stats, stats, set_open_replay_data);
1370         LPROCFS_MD_OP_INIT(num_private_stats, stats, clear_open_replay_data);
1371         LPROCFS_MD_OP_INIT(num_private_stats, stats, set_lock_data);
1372         LPROCFS_MD_OP_INIT(num_private_stats, stats, lock_match);
1373         LPROCFS_MD_OP_INIT(num_private_stats, stats, cancel_unused);
1374         LPROCFS_MD_OP_INIT(num_private_stats, stats, renew_capa);
1375         LPROCFS_MD_OP_INIT(num_private_stats, stats, unpack_capa);
1376         LPROCFS_MD_OP_INIT(num_private_stats, stats, get_remote_perm);
1377         LPROCFS_MD_OP_INIT(num_private_stats, stats, intent_getattr_async);
1378         LPROCFS_MD_OP_INIT(num_private_stats, stats, revalidate_lock);
1379 }
1380
1381 int lprocfs_alloc_md_stats(struct obd_device *obd,
1382                            unsigned int num_private_stats)
1383 {
1384         struct lprocfs_stats *stats;
1385         unsigned int num_stats;
1386         int rc, i;
1387
1388         CLASSERT(offsetof(struct md_ops, MD_STATS_FIRST_OP) == 0);
1389         CLASSERT(_MD_COUNTER_OFFSET(MD_STATS_FIRST_OP) == 0);
1390         CLASSERT(_MD_COUNTER_OFFSET(MD_STATS_LAST_OP) > 0);
1391
1392         /* TODO Ensure that this function is only used where
1393          * appropriate by adding an assertion to the effect that
1394          * obd->obd_type->typ_md_ops is not NULL. We can't do this now
1395          * because mdt_procfs_init() uses this function to allocate
1396          * the stats backing /proc/fs/lustre/mdt/.../md_stats but the
1397          * mdt layer does not use the md_ops interface. This is
1398          * confusing and a waste of memory. See LU-2484.
1399          */
1400         LASSERT(obd->obd_proc_entry != NULL);
1401         LASSERT(obd->obd_md_stats == NULL);
1402         LASSERT(obd->obd_md_cntr_base == 0);
1403
1404         num_stats = NUM_MD_STATS + num_private_stats;
1405         stats = lprocfs_alloc_stats(num_stats, 0);
1406         if (stats == NULL)
1407                 return -ENOMEM;
1408
1409         lprocfs_init_mps_stats(num_private_stats, stats);
1410
1411         for (i = num_private_stats; i < num_stats; i++) {
1412                 if (stats->ls_cnt_header[i].lc_name == NULL) {
1413                         CERROR("Missing md_stat initializer md_op "
1414                                "operation at offset %d. Aborting.\n",
1415                                i - num_private_stats);
1416                         LBUG();
1417                 }
1418         }
1419
1420         rc = lprocfs_register_stats(obd->obd_proc_entry, "md_stats", stats);
1421         if (rc < 0) {
1422                 lprocfs_free_stats(&stats);
1423         } else {
1424                 obd->obd_md_stats = stats;
1425                 obd->obd_md_cntr_base = num_private_stats;
1426         }
1427
1428         return rc;
1429 }
1430 EXPORT_SYMBOL(lprocfs_alloc_md_stats);
1431
1432 void lprocfs_free_md_stats(struct obd_device *obd)
1433 {
1434         struct lprocfs_stats *stats = obd->obd_md_stats;
1435
1436         if (stats != NULL) {
1437                 obd->obd_md_stats = NULL;
1438                 obd->obd_md_cntr_base = 0;
1439                 lprocfs_free_stats(&stats);
1440         }
1441 }
1442 EXPORT_SYMBOL(lprocfs_free_md_stats);
1443
1444 void lprocfs_init_ldlm_stats(struct lprocfs_stats *ldlm_stats)
1445 {
1446         lprocfs_counter_init(ldlm_stats,
1447                              LDLM_ENQUEUE - LDLM_FIRST_OPC,
1448                              0, "ldlm_enqueue", "reqs");
1449         lprocfs_counter_init(ldlm_stats,
1450                              LDLM_CONVERT - LDLM_FIRST_OPC,
1451                              0, "ldlm_convert", "reqs");
1452         lprocfs_counter_init(ldlm_stats,
1453                              LDLM_CANCEL - LDLM_FIRST_OPC,
1454                              0, "ldlm_cancel", "reqs");
1455         lprocfs_counter_init(ldlm_stats,
1456                              LDLM_BL_CALLBACK - LDLM_FIRST_OPC,
1457                              0, "ldlm_bl_callback", "reqs");
1458         lprocfs_counter_init(ldlm_stats,
1459                              LDLM_CP_CALLBACK - LDLM_FIRST_OPC,
1460                              0, "ldlm_cp_callback", "reqs");
1461         lprocfs_counter_init(ldlm_stats,
1462                              LDLM_GL_CALLBACK - LDLM_FIRST_OPC,
1463                              0, "ldlm_gl_callback", "reqs");
1464 }
1465 EXPORT_SYMBOL(lprocfs_init_ldlm_stats);
1466
1467 __s64 lprocfs_read_helper(struct lprocfs_counter *lc,
1468                           struct lprocfs_counter_header *header,
1469                           enum lprocfs_stats_flags flags,
1470                           enum lprocfs_fields_flags field)
1471 {
1472         __s64 ret = 0;
1473
1474         if (lc == NULL || header == NULL)
1475                 RETURN(0);
1476
1477         switch (field) {
1478                 case LPROCFS_FIELDS_FLAGS_CONFIG:
1479                         ret = header->lc_config;
1480                         break;
1481                 case LPROCFS_FIELDS_FLAGS_SUM:
1482                         ret = lc->lc_sum;
1483                         if ((flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
1484                                 ret += lc->lc_sum_irq;
1485                         break;
1486                 case LPROCFS_FIELDS_FLAGS_MIN:
1487                         ret = lc->lc_min;
1488                         break;
1489                 case LPROCFS_FIELDS_FLAGS_MAX:
1490                         ret = lc->lc_max;
1491                         break;
1492                 case LPROCFS_FIELDS_FLAGS_AVG:
1493                         ret = (lc->lc_max - lc->lc_min) / 2;
1494                         break;
1495                 case LPROCFS_FIELDS_FLAGS_SUMSQUARE:
1496                         ret = lc->lc_sumsquare;
1497                         break;
1498                 case LPROCFS_FIELDS_FLAGS_COUNT:
1499                         ret = lc->lc_count;
1500                         break;
1501                 default:
1502                         break;
1503         };
1504         RETURN(ret);
1505 }
1506 EXPORT_SYMBOL(lprocfs_read_helper);
1507
1508 int lprocfs_write_helper(const char __user *buffer, unsigned long count,
1509                          int *val)
1510 {
1511         return lprocfs_write_frac_helper(buffer, count, val, 1);
1512 }
1513 EXPORT_SYMBOL(lprocfs_write_helper);
1514
1515 int lprocfs_write_frac_helper(const char __user *buffer, unsigned long count,
1516                               int *val, int mult)
1517 {
1518         char kernbuf[20], *end, *pbuf;
1519
1520         if (count > (sizeof(kernbuf) - 1))
1521                 return -EINVAL;
1522
1523         if (copy_from_user(kernbuf, buffer, count))
1524                 return -EFAULT;
1525
1526         kernbuf[count] = '\0';
1527         pbuf = kernbuf;
1528         if (*pbuf == '-') {
1529                 mult = -mult;
1530                 pbuf++;
1531         }
1532
1533         *val = (int)simple_strtoul(pbuf, &end, 10) * mult;
1534         if (pbuf == end)
1535                 return -EINVAL;
1536
1537         if (end != NULL && *end == '.') {
1538                 int temp_val, pow = 1;
1539                 int i;
1540
1541                 pbuf = end + 1;
1542                 if (strlen(pbuf) > 5)
1543                         pbuf[5] = '\0'; /*only allow 5bits fractional*/
1544
1545                 temp_val = (int)simple_strtoul(pbuf, &end, 10) * mult;
1546
1547                 if (pbuf < end) {
1548                         for (i = 0; i < (end - pbuf); i++)
1549                                 pow *= 10;
1550
1551                         *val += temp_val / pow;
1552                 }
1553         }
1554         return 0;
1555 }
1556 EXPORT_SYMBOL(lprocfs_write_frac_helper);
1557
1558 int lprocfs_read_frac_helper(char *buffer, unsigned long count, long val,
1559                              int mult)
1560 {
1561         long decimal_val, frac_val;
1562         int prtn;
1563
1564         if (count < 10)
1565                 return -EINVAL;
1566
1567         decimal_val = val / mult;
1568         prtn = snprintf(buffer, count, "%ld", decimal_val);
1569         frac_val = val % mult;
1570
1571         if (prtn < (count - 4) && frac_val > 0) {
1572                 long temp_frac;
1573                 int i, temp_mult = 1, frac_bits = 0;
1574
1575                 temp_frac = frac_val * 10;
1576                 buffer[prtn++] = '.';
1577                 while (frac_bits < 2 && (temp_frac / mult) < 1 ) {
1578                         /* only reserved 2 bits fraction */
1579                         buffer[prtn++] ='0';
1580                         temp_frac *= 10;
1581                         frac_bits++;
1582                 }
1583                 /*
1584                  * Need to think these cases :
1585                  *      1. #echo x.00 > /proc/xxx       output result : x
1586                  *      2. #echo x.0x > /proc/xxx       output result : x.0x
1587                  *      3. #echo x.x0 > /proc/xxx       output result : x.x
1588                  *      4. #echo x.xx > /proc/xxx       output result : x.xx
1589                  *      Only reserved 2 bits fraction.
1590                  */
1591                 for (i = 0; i < (5 - prtn); i++)
1592                         temp_mult *= 10;
1593
1594                 frac_bits = min((int)count - prtn, 3 - frac_bits);
1595                 prtn += snprintf(buffer + prtn, frac_bits, "%ld",
1596                                  frac_val * temp_mult / mult);
1597
1598                 prtn--;
1599                 while(buffer[prtn] < '1' || buffer[prtn] > '9') {
1600                         prtn--;
1601                         if (buffer[prtn] == '.') {
1602                                 prtn--;
1603                                 break;
1604                         }
1605                 }
1606                 prtn++;
1607         }
1608         buffer[prtn++] ='\n';
1609         return prtn;
1610 }
1611
1612 int lprocfs_seq_read_frac_helper(struct seq_file *m, long val, int mult)
1613 {
1614         long decimal_val, frac_val;
1615
1616         decimal_val = val / mult;
1617         seq_printf(m, "%ld", decimal_val);
1618         frac_val = val % mult;
1619
1620         if (frac_val > 0) {
1621                 frac_val *= 100;
1622                 frac_val /= mult;
1623         }
1624         if (frac_val > 0) {
1625                 /* Three cases: x0, xx, 0x */
1626                 if ((frac_val % 10) != 0)
1627                         seq_printf(m, ".%ld", frac_val);
1628                 else
1629                         seq_printf(m, ".%ld", frac_val / 10);
1630         }
1631
1632         seq_printf(m, "\n");
1633         return 0;
1634 }
1635 EXPORT_SYMBOL(lprocfs_seq_read_frac_helper);
1636
1637 int lprocfs_write_u64_helper(const char __user *buffer, unsigned long count,
1638                              __u64 *val)
1639 {
1640         return lprocfs_write_frac_u64_helper(buffer, count, val, 1);
1641 }
1642 EXPORT_SYMBOL(lprocfs_write_u64_helper);
1643
1644 int lprocfs_write_frac_u64_helper(const char __user *buffer,
1645                                   unsigned long count,
1646                                   __u64 *val, int mult)
1647 {
1648         char kernbuf[22], *end, *pbuf;
1649         __u64 whole, frac = 0, units;
1650         unsigned frac_d = 1;
1651
1652         if (count > (sizeof(kernbuf) - 1))
1653                 return -EINVAL;
1654
1655         if (copy_from_user(kernbuf, buffer, count))
1656                 return -EFAULT;
1657
1658         kernbuf[count] = '\0';
1659         pbuf = kernbuf;
1660         if (*pbuf == '-') {
1661                 mult = -mult;
1662                 pbuf++;
1663         }
1664
1665         whole = simple_strtoull(pbuf, &end, 10);
1666         if (pbuf == end)
1667                 return -EINVAL;
1668
1669         if (end != NULL && *end == '.') {
1670                 int i;
1671                 pbuf = end + 1;
1672
1673                 /* need to limit frac_d to a __u32 */
1674                 if (strlen(pbuf) > 10)
1675                         pbuf[10] = '\0';
1676
1677                 frac = simple_strtoull(pbuf, &end, 10);
1678                 /* count decimal places */
1679                 for (i = 0; i < (end - pbuf); i++)
1680                         frac_d *= 10;
1681         }
1682
1683         units = 1;
1684         if (end != NULL) {
1685                 switch (*end) {
1686                 case 'p': case 'P':
1687                         units <<= 10;
1688                 case 't': case 'T':
1689                         units <<= 10;
1690                 case 'g': case 'G':
1691                         units <<= 10;
1692                 case 'm': case 'M':
1693                         units <<= 10;
1694                 case 'k': case 'K':
1695                         units <<= 10;
1696                 }
1697         }
1698         /* Specified units override the multiplier */
1699         if (units > 1)
1700                 mult = mult < 0 ? -units : units;
1701
1702         frac *= mult;
1703         do_div(frac, frac_d);
1704         *val = whole * mult + frac;
1705         return 0;
1706 }
1707 EXPORT_SYMBOL(lprocfs_write_frac_u64_helper);
1708
1709 static char *lprocfs_strnstr(const char *s1, const char *s2, size_t len)
1710 {
1711         size_t l2;
1712
1713         l2 = strlen(s2);
1714         if (!l2)
1715                 return (char *)s1;
1716         while (len >= l2) {
1717                 len--;
1718                 if (!memcmp(s1, s2, l2))
1719                         return (char *)s1;
1720                 s1++;
1721         }
1722         return NULL;
1723 }
1724
1725 /**
1726  * Find the string \a name in the input \a buffer, and return a pointer to the
1727  * value immediately following \a name, reducing \a count appropriately.
1728  * If \a name is not found the original \a buffer is returned.
1729  */
1730 char *lprocfs_find_named_value(const char *buffer, const char *name,
1731                                 size_t *count)
1732 {
1733         char *val;
1734         size_t buflen = *count;
1735
1736         /* there is no strnstr() in rhel5 and ubuntu kernels */
1737         val = lprocfs_strnstr(buffer, name, buflen);
1738         if (val == NULL)
1739                 return (char *)buffer;
1740
1741         val += strlen(name);                             /* skip prefix */
1742         while (val < buffer + buflen && isspace(*val)) /* skip separator */
1743                 val++;
1744
1745         *count = 0;
1746         while (val < buffer + buflen && isalnum(*val)) {
1747                 ++*count;
1748                 ++val;
1749         }
1750
1751         return val - *count;
1752 }
1753 EXPORT_SYMBOL(lprocfs_find_named_value);
1754
1755 int lprocfs_seq_create(struct proc_dir_entry *parent,
1756                        const char *name,
1757                        mode_t mode,
1758                        const struct file_operations *seq_fops,
1759                        void *data)
1760 {
1761         struct proc_dir_entry *entry;
1762         ENTRY;
1763
1764         /* Disallow secretly (un)writable entries. */
1765         LASSERT((seq_fops->write == NULL) == ((mode & 0222) == 0));
1766
1767         entry = proc_create_data(name, mode, parent, seq_fops, data);
1768
1769         if (entry == NULL)
1770                 RETURN(-ENOMEM);
1771
1772         RETURN(0);
1773 }
1774 EXPORT_SYMBOL(lprocfs_seq_create);
1775
1776 int lprocfs_obd_seq_create(struct obd_device *dev,
1777                            const char *name,
1778                            mode_t mode,
1779                            const struct file_operations *seq_fops,
1780                            void *data)
1781 {
1782         return (lprocfs_seq_create(dev->obd_proc_entry, name,
1783                                    mode, seq_fops, data));
1784 }
1785 EXPORT_SYMBOL(lprocfs_obd_seq_create);
1786
1787 void lprocfs_oh_tally(struct obd_histogram *oh, unsigned int value)
1788 {
1789         if (value >= OBD_HIST_MAX)
1790                 value = OBD_HIST_MAX - 1;
1791
1792         spin_lock(&oh->oh_lock);
1793         oh->oh_buckets[value]++;
1794         spin_unlock(&oh->oh_lock);
1795 }
1796 EXPORT_SYMBOL(lprocfs_oh_tally);
1797
1798 void lprocfs_oh_tally_log2(struct obd_histogram *oh, unsigned int value)
1799 {
1800         unsigned int val = 0;
1801
1802         if (likely(value != 0))
1803                 val = min(fls(value - 1), OBD_HIST_MAX);
1804
1805         lprocfs_oh_tally(oh, val);
1806 }
1807 EXPORT_SYMBOL(lprocfs_oh_tally_log2);
1808
1809 unsigned long lprocfs_oh_sum(struct obd_histogram *oh)
1810 {
1811         unsigned long ret = 0;
1812         int i;
1813
1814         for (i = 0; i < OBD_HIST_MAX; i++)
1815                 ret +=  oh->oh_buckets[i];
1816         return ret;
1817 }
1818 EXPORT_SYMBOL(lprocfs_oh_sum);
1819
1820 void lprocfs_oh_clear(struct obd_histogram *oh)
1821 {
1822         spin_lock(&oh->oh_lock);
1823         memset(oh->oh_buckets, 0, sizeof(oh->oh_buckets));
1824         spin_unlock(&oh->oh_lock);
1825 }
1826 EXPORT_SYMBOL(lprocfs_oh_clear);
1827
1828 int lprocfs_obd_rd_max_pages_per_rpc(char *page, char **start, off_t off,
1829                                      int count, int *eof, void *data)
1830 {
1831         struct obd_device *dev = data;
1832         struct client_obd *cli = &dev->u.cli;
1833         int rc;
1834
1835         spin_lock(&cli->cl_loi_list_lock);
1836         rc = snprintf(page, count, "%d\n", cli->cl_max_pages_per_rpc);
1837         spin_unlock(&cli->cl_loi_list_lock);
1838
1839         return rc;
1840 }
1841
1842 int lprocfs_obd_max_pages_per_rpc_seq_show(struct seq_file *m, void *data)
1843 {
1844         struct obd_device *dev = data;
1845         struct client_obd *cli = &dev->u.cli;
1846         int rc;
1847
1848         spin_lock(&cli->cl_loi_list_lock);
1849         rc = seq_printf(m, "%d\n", cli->cl_max_pages_per_rpc);
1850         spin_unlock(&cli->cl_loi_list_lock);
1851         return rc;
1852 }
1853 EXPORT_SYMBOL(lprocfs_obd_max_pages_per_rpc_seq_show);
1854
1855 int lprocfs_wr_root_squash(const char __user *buffer, unsigned long count,
1856                            struct root_squash_info *squash, char *name)
1857 {
1858         int rc;
1859         char kernbuf[64], *tmp, *errmsg;
1860         unsigned long uid, gid;
1861         ENTRY;
1862
1863         if (count >= sizeof(kernbuf)) {
1864                 errmsg = "string too long";
1865                 GOTO(failed_noprint, rc = -EINVAL);
1866         }
1867         if (copy_from_user(kernbuf, buffer, count)) {
1868                 errmsg = "bad address";
1869                 GOTO(failed_noprint, rc = -EFAULT);
1870         }
1871         kernbuf[count] = '\0';
1872
1873         /* look for uid gid separator */
1874         tmp = strchr(kernbuf, ':');
1875         if (tmp == NULL) {
1876                 errmsg = "needs uid:gid format";
1877                 GOTO(failed, rc = -EINVAL);
1878         }
1879         *tmp = '\0';
1880         tmp++;
1881
1882         /* parse uid */
1883         if (kstrtoul(kernbuf, 0, &uid) != 0) {
1884                 errmsg = "bad uid";
1885                 GOTO(failed, rc = -EINVAL);
1886         }
1887
1888         /* parse gid */
1889         if (kstrtoul(tmp, 0, &gid) != 0) {
1890                 errmsg = "bad gid";
1891                 GOTO(failed, rc = -EINVAL);
1892         }
1893
1894         squash->rsi_uid = uid;
1895         squash->rsi_gid = gid;
1896
1897         LCONSOLE_INFO("%s: root_squash is set to %u:%u\n",
1898                       name, squash->rsi_uid, squash->rsi_gid);
1899         RETURN(count);
1900
1901 failed:
1902         if (tmp != NULL) {
1903                 tmp--;
1904                 *tmp = ':';
1905         }
1906         CWARN("%s: failed to set root_squash to \"%s\", %s, rc = %d\n",
1907               name, kernbuf, errmsg, rc);
1908         RETURN(rc);
1909 failed_noprint:
1910         CWARN("%s: failed to set root_squash due to %s, rc = %d\n",
1911               name, errmsg, rc);
1912         RETURN(rc);
1913 }
1914 EXPORT_SYMBOL(lprocfs_wr_root_squash);
1915
1916
1917 int lprocfs_wr_nosquash_nids(const char __user *buffer, unsigned long count,
1918                              struct root_squash_info *squash, char *name)
1919 {
1920         int rc;
1921         char *kernbuf = NULL;
1922         char *errmsg;
1923         struct list_head tmp;
1924         ENTRY;
1925
1926         if (count > 4096) {
1927                 errmsg = "string too long";
1928                 GOTO(failed, rc = -EINVAL);
1929         }
1930
1931         OBD_ALLOC(kernbuf, count + 1);
1932         if (kernbuf == NULL) {
1933                 errmsg = "no memory";
1934                 GOTO(failed, rc = -ENOMEM);
1935         }
1936         if (copy_from_user(kernbuf, buffer, count)) {
1937                 errmsg = "bad address";
1938                 GOTO(failed, rc = -EFAULT);
1939         }
1940         kernbuf[count] = '\0';
1941
1942         if (count > 0 && kernbuf[count - 1] == '\n')
1943                 kernbuf[count - 1] = '\0';
1944
1945         if (strcmp(kernbuf, "NONE") == 0 || strcmp(kernbuf, "clear") == 0) {
1946                 /* empty string is special case */
1947                 down_write(&squash->rsi_sem);
1948                 if (!list_empty(&squash->rsi_nosquash_nids))
1949                         cfs_free_nidlist(&squash->rsi_nosquash_nids);
1950                 up_write(&squash->rsi_sem);
1951                 LCONSOLE_INFO("%s: nosquash_nids is cleared\n", name);
1952                 OBD_FREE(kernbuf, count + 1);
1953                 RETURN(count);
1954         }
1955
1956         INIT_LIST_HEAD(&tmp);
1957         if (cfs_parse_nidlist(kernbuf, count, &tmp) <= 0) {
1958                 errmsg = "can't parse";
1959                 GOTO(failed, rc = -EINVAL);
1960         }
1961         LCONSOLE_INFO("%s: nosquash_nids set to %s\n",
1962                       name, kernbuf);
1963         OBD_FREE(kernbuf, count + 1);
1964         kernbuf = NULL;
1965
1966         down_write(&squash->rsi_sem);
1967         if (!list_empty(&squash->rsi_nosquash_nids))
1968                 cfs_free_nidlist(&squash->rsi_nosquash_nids);
1969         list_splice(&tmp, &squash->rsi_nosquash_nids);
1970         up_write(&squash->rsi_sem);
1971
1972         RETURN(count);
1973
1974 failed:
1975         if (kernbuf) {
1976                 CWARN("%s: failed to set nosquash_nids to \"%s\", %s rc = %d\n",
1977                       name, kernbuf, errmsg, rc);
1978                 OBD_FREE(kernbuf, count + 1);
1979         } else {
1980                 CWARN("%s: failed to set nosquash_nids due to %s rc = %d\n",
1981                       name, errmsg, rc);
1982         }
1983         RETURN(rc);
1984 }
1985 EXPORT_SYMBOL(lprocfs_wr_nosquash_nids);
1986
1987 #endif /* CONFIG_PROC_FS*/