1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2002 Cluster File Systems, Inc.
6 * This file is part of Lustre, http://www.lustre.org.
8 * Lustre is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * Lustre is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Lustre; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 * Top level header file for LProc SNMP
22 * Author: Hariharan Thantry thantry@users.sourceforge.net
24 #ifndef _LPROCFS_SNMP_H
25 #define _LPROCFS_SNMP_H
29 #include <linux/config.h>
30 #include <linux/autoconf.h>
31 #include <linux/proc_fs.h>
32 #include <linux/version.h>
33 #include <linux/smp.h>
34 #include <linux/kp30.h>
36 # if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
37 # include <linux/statfs.h>
39 # define kstatfs statfs
43 # define kstatfs statfs
48 #ifdef CONFIG_PROC_FS /* Ensure that /proc is configured */
55 read_proc_t *read_fptr;
56 write_proc_t *write_fptr;
60 struct lprocfs_static_vars {
61 struct lprocfs_vars *module_vars;
62 struct lprocfs_vars *obd_vars;
65 /* An lprocfs counter can be configured using the enum bit masks below.
67 * LPROCFS_CNTR_EXTERNALLOCK indicates that an external lock already
68 * protects this counter from concurrent updates. If not specified,
69 * lprocfs an internal per-counter lock variable. External locks are
70 * not used to protect counter increments, but are used to protect
71 * counter readout and resets.
73 * LPROCFS_CNTR_AVGMINMAX indicates a multi-valued counter samples,
74 * (i.e. counter can be incremented by more than "1"). When specified,
75 * the counter maintains min, max and sum in addition to a simple
76 * invocation count. This allows averages to be be computed.
77 * If not specified, the counter is an increment-by-1 counter.
78 * min, max, sum, etc. are not maintained.
80 * LPROCFS_CNTR_STDDEV indicates that the counter should track sum of
81 * squares (for multi-valued counter samples only). This allows
82 * external computation of standard deviation, but involves a 64-bit
83 * multiply per counter increment.
87 LPROCFS_CNTR_EXTERNALLOCK = 0x0001,
88 LPROCFS_CNTR_AVGMINMAX = 0x0002,
89 LPROCFS_CNTR_STDDEV = 0x0004,
91 /* counter data type */
92 LPROCFS_TYPE_REGS = 0x0100,
93 LPROCFS_TYPE_BYTES = 0x0200,
94 LPROCFS_TYPE_PAGES = 0x0400,
95 LPROCFS_TYPE_CYCLE = 0x0800,
98 struct lprocfs_atomic {
103 struct lprocfs_counter {
104 struct lprocfs_atomic lc_cntl; /* may need to move to per set */
105 unsigned int lc_config;
111 const char *lc_name; /* must be static */
112 const char *lc_units; /* must be static */
115 struct lprocfs_percpu {
116 struct lprocfs_counter lp_cntr[0];
120 struct lprocfs_stats {
121 unsigned int ls_num; /* # of counters */
122 unsigned int ls_percpu_size;
123 struct lprocfs_percpu *ls_percpu[0];
128 extern struct proc_dir_entry *proc_lustre_root;
135 /* Two optimized LPROCFS counter increment functions are provided:
136 * lprocfs_counter_incr(cntr, value) - optimized for by-one counters
137 * lprocfs_counter_add(cntr) - use for multi-valued counters
138 * Counter data layout allows config flag, counter lock and the
139 * count itself to reside within a single cache line.
142 static inline void lprocfs_counter_add(struct lprocfs_stats *stats, int idx,
145 struct lprocfs_counter *percpu_cntr;
147 LASSERT(stats != NULL);
148 percpu_cntr = &(stats->ls_percpu[smp_processor_id()]->lp_cntr[idx]);
149 atomic_inc(&percpu_cntr->lc_cntl.la_entry);
150 percpu_cntr->lc_count++;
152 if (percpu_cntr->lc_config & LPROCFS_CNTR_AVGMINMAX) {
153 percpu_cntr->lc_sum += amount;
154 if (percpu_cntr->lc_config & LPROCFS_CNTR_STDDEV)
155 percpu_cntr->lc_sumsquare += (__u64)amount * amount;
156 if (amount < percpu_cntr->lc_min)
157 percpu_cntr->lc_min = amount;
158 if (amount > percpu_cntr->lc_max)
159 percpu_cntr->lc_max = amount;
161 atomic_inc(&percpu_cntr->lc_cntl.la_exit);
164 static inline void lprocfs_counter_incr(struct lprocfs_stats *stats, int idx)
166 struct lprocfs_counter *percpu_cntr;
168 LASSERT(stats != NULL);
169 percpu_cntr = &(stats->ls_percpu[smp_processor_id()]->lp_cntr[idx]);
170 atomic_inc(&percpu_cntr->lc_cntl.la_entry);
171 percpu_cntr->lc_count++;
172 atomic_inc(&percpu_cntr->lc_cntl.la_exit);
175 extern struct lprocfs_stats *lprocfs_alloc_stats(unsigned int num);
176 extern void lprocfs_free_stats(struct lprocfs_stats *stats);
177 extern int lprocfs_alloc_obd_stats(struct obd_device *obddev,
178 unsigned int num_private_stats);
179 extern void lprocfs_counter_init(struct lprocfs_stats *stats, int index,
180 unsigned conf, const char *name,
182 extern void lprocfs_free_obd_stats(struct obd_device *obddev);
183 extern int lprocfs_register_stats(struct proc_dir_entry *root, const char *name,
184 struct lprocfs_stats *stats);
186 #define LPROCFS_INIT_MULTI_VARS(array, size) \
187 void lprocfs_init_multi_vars(unsigned int idx, \
188 struct lprocfs_static_vars *x) \
190 struct lprocfs_static_vars *glob = (struct lprocfs_static_vars*)array; \
191 LASSERT(glob != 0); \
192 LASSERT(idx < (unsigned int)(size)); \
193 x->module_vars = glob[idx].module_vars; \
194 x->obd_vars = glob[idx].obd_vars; \
197 #define LPROCFS_INIT_VARS(name, vclass, vinstance) \
198 void lprocfs_##name##_init_vars(struct lprocfs_static_vars *x) \
200 x->module_vars = vclass; \
201 x->obd_vars = vinstance; \
204 #define lprocfs_init_vars(NAME, VAR) \
206 extern void lprocfs_##NAME##_init_vars(struct lprocfs_static_vars *); \
207 lprocfs_##NAME##_init_vars(VAR); \
209 extern void lprocfs_init_multi_vars(unsigned int idx,
210 struct lprocfs_static_vars *var);
211 /* lprocfs_status.c */
212 extern int lprocfs_add_vars(struct proc_dir_entry *root,
213 struct lprocfs_vars *var,
216 extern struct proc_dir_entry *lprocfs_register(const char *name,
217 struct proc_dir_entry *parent,
218 struct lprocfs_vars *list,
221 extern void lprocfs_remove(struct proc_dir_entry *root);
223 extern struct proc_dir_entry *lprocfs_srch(struct proc_dir_entry *root,
226 extern int lprocfs_obd_attach(struct obd_device *dev, struct lprocfs_vars *list);
227 extern int lprocfs_obd_detach(struct obd_device *dev);
229 /* Generic callbacks */
231 extern int lprocfs_rd_u64(char *page, char **start, off_t off,
232 int count, int *eof, void *data);
233 extern int lprocfs_rd_uuid(char *page, char **start, off_t off,
234 int count, int *eof, void *data);
235 extern int lprocfs_rd_name(char *page, char **start, off_t off,
236 int count, int *eof, void *data);
237 extern int lprocfs_rd_fstype(char *page, char **start, off_t off,
238 int count, int *eof, void *data);
239 extern int lprocfs_rd_server_uuid(char *page, char **start, off_t off,
240 int count, int *eof, void *data);
241 extern int lprocfs_rd_conn_uuid(char *page, char **start, off_t off,
242 int count, int *eof, void *data);
243 extern int lprocfs_rd_numrefs(char *page, char **start, off_t off,
244 int count, int *eof, void *data);
247 extern int lprocfs_rd_blksize(char *page, char **start, off_t off,
248 int count, int *eof, void *data);
249 extern int lprocfs_rd_kbytestotal(char *page, char **start, off_t off,
250 int count, int *eof, void *data);
251 extern int lprocfs_rd_kbytesfree(char *page, char **start, off_t off,
252 int count, int *eof, void *data);
253 extern int lprocfs_rd_filestotal(char *page, char **start, off_t off,
254 int count, int *eof, void *data);
255 extern int lprocfs_rd_filesfree(char *page, char **start, off_t off,
256 int count, int *eof, void *data);
257 extern int lprocfs_rd_filegroups(char *page, char **start, off_t off,
258 int count, int *eof, void *data);
260 /* lprocfs_status.c: counter read/write functions */
261 extern int lprocfs_counter_read(char *page, char **start, off_t off,
262 int count, int *eof, void *data);
263 extern int lprocfs_counter_write(struct file *file, const char *buffer,
264 unsigned long count, void *data);
266 /* LPROCFS is not defined */
267 static inline void lprocfs_counter_add(struct lprocfs_stats *stats,
268 int index, long amount) { return; }
269 static inline void lprocfs_counter_incr(struct lprocfs_stats *stats,
270 int index) { return; }
271 static inline void lprocfs_counter_init(struct lprocfs_stats *stats,
272 int index, unsigned conf,
273 const char *name, const char *units)
276 static inline struct lprocfs_stats* lprocfs_alloc_stats(unsigned int num)
278 static inline void lprocfs_free_stats(struct lprocfs_stats *stats)
281 static inline int lprocfs_register_stats(struct proc_dir_entry *root,
283 struct lprocfs_stats *stats)
285 static inline int lprocfs_alloc_obd_stats(struct obd_device *obddev,
286 unsigned int num_private_stats)
288 static inline void lprocfs_free_obd_stats(struct obd_device *obddev)
291 static inline struct proc_dir_entry *
292 lprocfs_register(const char *name, struct proc_dir_entry *parent,
293 struct lprocfs_vars *list, void *data) { return NULL; }
294 #define LPROCFS_INIT_MULTI_VARS(array, size) do {} while (0)
295 static inline void lprocfs_init_multi_vars(unsigned int idx,
296 struct lprocfs_static_vars *x) { return; }
297 #define LPROCFS_INIT_VARS(name, vclass, vinstance) do {} while (0)
298 #define lprocfs_init_vars(...) do {} while (0)
299 static inline int lprocfs_add_vars(struct proc_dir_entry *root,
300 struct lprocfs_vars *var,
301 void *data) { return 0; }
302 static inline void lprocfs_remove(struct proc_dir_entry *root) {};
303 static inline struct proc_dir_entry *lprocfs_srch(struct proc_dir_entry *head,
304 const char *name) {return 0;}
305 static inline int lprocfs_obd_attach(struct obd_device *dev,
306 struct lprocfs_vars *list) { return 0; }
307 static inline int lprocfs_obd_detach(struct obd_device *dev) { return 0; }
308 static inline int lprocfs_rd_u64(char *page, char **start, off_t off,
309 int count, int *eof, void *data) { return 0; }
310 static inline int lprocfs_rd_uuid(char *page, char **start, off_t off,
311 int count, int *eof, void *data) { return 0; }
312 static inline int lprocfs_rd_name(char *page, char **start, off_t off,
313 int count, int *eof, void *data) { return 0; }
314 static inline int lprocfs_rd_server_uuid(char *page, char **start, off_t off,
315 int count, int *eof, void *data) { return 0; }
316 static inline int lprocfs_rd_conn_uuid(char *page, char **start, off_t off,
317 int count, int *eof, void *data) { return 0; }
318 static inline int lprocfs_rd_numrefs(char *page, char **start, off_t off,
319 int count, int *eof, void *data) { return 0; }
323 int lprocfs_rd_blksize(char *page, char **start, off_t off,
324 int count, int *eof, void *data) { return 0; }
326 int lprocfs_rd_kbytestotal(char *page, char **start, off_t off,
327 int count, int *eof, void *data) { return 0; }
329 int lprocfs_rd_kbytesfree(char *page, char **start, off_t off,
330 int count, int *eof, void *data) { return 0; }
332 int lprocfs_rd_filestotal(char *page, char **start, off_t off,
333 int count, int *eof, void *data) { return 0; }
335 int lprocfs_rd_filesfree(char *page, char **start, off_t off,
336 int count, int *eof, void *data) { return 0; }
338 int lprocfs_rd_filegroups(char *page, char **start, off_t off,
339 int count, int *eof, void *data) { return 0; }
341 int lprocfs_counter_read(char *page, char **start, off_t off,
342 int count, int *eof, void *data) { return 0; }
344 int lprocfs_counter_write(struct file *file, const char *buffer,
345 unsigned long count, void *data) { return 0; }
348 #endif /* LPROCFS_SNMP_H */