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[fs/lustre-release.git] / lustre / obdfilter / lproc_obdfilter.c
index ef632a9..e25568c 100644 (file)
@@ -1,44 +1,53 @@
 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
  * vim:expandtab:shiftwidth=8:tabstop=8:
  *
- *  Copyright (C) 2002, 2003 Cluster File Systems, Inc.
+ * GPL HEADER START
  *
- *   This file is part of Lustre, http://www.lustre.org.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
- *   Lustre is free software; you can redistribute it and/or
- *   modify it under the terms of version 2 of the GNU General Public
- *   License as published by the Free Software Foundation.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
  *
- *   Lustre is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
  *
- *   You should have received a copy of the GNU General Public License
- *   along with Lustre; if not, write to the Free Software
- *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright  2008 Sun Microsystems, Inc. All rights reserved
+ * Use is subject to license terms.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
  */
 #define DEBUG_SUBSYSTEM S_CLASS
 
 #include <linux/version.h>
-#include <linux/lprocfs_status.h>
-#include <linux/obd.h>
+#include <lprocfs_status.h>
+#include <obd.h>
 #include <linux/seq_file.h>
 #include <linux/version.h>
 
 #include "filter_internal.h"
 
-#ifndef LPROCFS
-static struct lprocfs_vars lprocfs_obd_vars[]  = { {0} };
-static struct lprocfs_vars lprocfs_module_vars[] = { {0} };
-#else
-
+#ifdef LPROCFS
 static int lprocfs_filter_rd_groups(char *page, char **start, off_t off,
                                     int count, int *eof, void *data)
 {
         struct obd_device *obd = (struct obd_device *)data;
-        
         *eof = 1;
         return snprintf(page, count, "%u\n", obd->u.filter.fo_group_count);
 }
@@ -95,7 +104,7 @@ static int lprocfs_filter_rd_last_id(char *page, char **start, off_t off,
         if (obd == NULL)
                 return 0;
 
-        for (i = 1; i < filter->fo_group_count; i++) {
+        for (i = FILTER_GROUP_MDS0; i < filter->fo_group_count; i++) {
                 rc = snprintf(page, count, LPU64"\n",filter_last_id(filter, i));
                 if (rc < 0) {
                         retval = rc;
@@ -134,7 +143,106 @@ int lprocfs_filter_wr_readcache(struct file *file, const char *buffer,
         return count;
 }
 
-static struct lprocfs_vars lprocfs_obd_vars[] = {
+
+int lprocfs_filter_rd_fmd_max_num(char *page, char **start, off_t off,
+                                  int count, int *eof, void *data)
+{
+        struct obd_device *obd = data;
+        int rc;
+
+        rc = snprintf(page, count, "%u\n", obd->u.filter.fo_fmd_max_num);
+        return rc;
+}
+
+int lprocfs_filter_wr_fmd_max_num(struct file *file, const char *buffer,
+                                  unsigned long count, void *data)
+{
+        struct obd_device *obd = data;
+        int val;
+        int rc;
+
+        rc = lprocfs_write_helper(buffer, count, &val);
+        if (rc)
+                return rc;
+
+        if (val > 65536 || val < 1)
+                return -EINVAL;
+
+        obd->u.filter.fo_fmd_max_num = val;
+        return count;
+}
+
+int lprocfs_filter_rd_fmd_max_age(char *page, char **start, off_t off,
+                                  int count, int *eof, void *data)
+{
+        struct obd_device *obd = data;
+        int rc;
+
+        rc = snprintf(page, count, "%u\n", obd->u.filter.fo_fmd_max_age / HZ);
+        return rc;
+}
+
+int lprocfs_filter_wr_fmd_max_age(struct file *file, const char *buffer,
+                                  unsigned long count, void *data)
+{
+        struct obd_device *obd = data;
+        int val;
+        int rc;
+
+        rc = lprocfs_write_helper(buffer, count, &val);
+        if (rc)
+                return rc;
+
+        if (val > 65536 || val < 1)
+                return -EINVAL;
+
+        obd->u.filter.fo_fmd_max_age = val * HZ;
+        return count;
+}
+
+static int lprocfs_filter_rd_capa(char *page, char **start, off_t off,
+                                  int count, int *eof, void *data)
+{
+        struct obd_device *obd = data;
+        int rc;
+
+        rc = snprintf(page, count, "capability on: %s\n",
+                      obd->u.filter.fo_fl_oss_capa ? "oss" : "");
+        return rc;
+}
+
+static int lprocfs_filter_wr_capa(struct file *file, const char *buffer,
+                                  unsigned long count, void *data)
+{
+        struct obd_device *obd = data;
+        int val, rc;
+
+        rc = lprocfs_write_helper(buffer, count, &val);
+        if (rc)
+                return rc;
+
+        if (val & ~0x1) {
+                CERROR("invalid capability mode, only 0/1 are accepted.\n"
+                       " 1: enable oss fid capability\n"
+                       " 0: disable oss fid capability\n");
+                return -EINVAL;
+        }
+
+        obd->u.filter.fo_fl_oss_capa = val;
+        LCONSOLE_INFO("OSS %s %s fid capability.\n", obd->obd_name,
+                      val ? "enabled" : "disabled");
+        return count;
+}
+
+static int lprocfs_filter_rd_capa_count(char *page, char **start, off_t off,
+                                        int count, int *eof, void *data)
+{
+        return snprintf(page, count, "%d %d\n",
+                        capa_count[CAPA_SITE_CLIENT],
+                        capa_count[CAPA_SITE_SERVER]);
+}
+
+static struct lprocfs_vars lprocfs_filter_obd_vars[] = {
         { "uuid",         lprocfs_rd_uuid,          0, 0 },
         { "blocksize",    lprocfs_rd_blksize,       0, 0 },
         { "kbytestotal",  lprocfs_rd_kbytestotal,   0, 0 },
@@ -149,22 +257,43 @@ static struct lprocfs_vars lprocfs_obd_vars[] = {
         { "tot_dirty",    lprocfs_filter_rd_tot_dirty,   0, 0 },
         { "tot_pending",  lprocfs_filter_rd_tot_pending, 0, 0 },
         { "tot_granted",  lprocfs_filter_rd_tot_granted, 0, 0 },
+        { "hash_stats",   lprocfs_obd_rd_hash,      0, 0 },
+        { "recovery_status", lprocfs_obd_rd_recovery_status, 0, 0 },
+        { "recovery_maxtime", lprocfs_obd_rd_recovery_maxtime,
+                              lprocfs_obd_wr_recovery_maxtime, 0},
+        { "evict_client", 0, lprocfs_wr_evict_client, 0,
+                                &lprocfs_evict_client_fops},
         { "num_exports",  lprocfs_rd_num_exports,   0, 0 },
         { "readcache_max_filesize",
                           lprocfs_filter_rd_readcache,
                           lprocfs_filter_wr_readcache, 0 },
-        { "recovery_status", lprocfs_obd_rd_recovery_status, 0, 0 },
+#ifdef HAVE_QUOTA_SUPPORT
+        { "quota_bunit_sz", lprocfs_rd_bunit, lprocfs_wr_bunit, 0},
+        { "quota_btune_sz", lprocfs_rd_btune, lprocfs_wr_btune, 0},
+        { "quota_iunit_sz", lprocfs_rd_iunit, lprocfs_wr_iunit, 0},
+        { "quota_itune_sz", lprocfs_rd_itune, lprocfs_wr_itune, 0},
+        { "quota_type",     lprocfs_rd_type, lprocfs_wr_type, 0},
+#endif
+        { "client_cache_count", lprocfs_filter_rd_fmd_max_num,
+                          lprocfs_filter_wr_fmd_max_num, 0 },
+        { "client_cache_seconds", lprocfs_filter_rd_fmd_max_age,
+                          lprocfs_filter_wr_fmd_max_age, 0 },
+        { "capa",         lprocfs_filter_rd_capa,
+                          lprocfs_filter_wr_capa, 0 },
+        { "capa_count",   lprocfs_filter_rd_capa_count, 0, 0 },
         { 0 }
 };
 
-static struct lprocfs_vars lprocfs_module_vars[] = {
+static struct lprocfs_vars lprocfs_filter_module_vars[] = {
         { "num_refs",     lprocfs_rd_numrefs,       0, 0 },
         { 0 }
 };
 
-void filter_tally_write(struct filter_obd *filter, struct page **pages,
-                     int nr_pages, unsigned long *blocks, int blocks_per_page)
+void filter_tally(struct obd_export *exp, struct page **pages, int nr_pages,
+                  unsigned long *blocks, int blocks_per_page, int wr)
 {
+        struct filter_obd *filter = &exp->exp_obd->u.filter;
+        struct filter_export_data *fed = &exp->exp_filter_data;
         struct page *last_page = NULL;
         unsigned long *last_block = NULL;
         unsigned long discont_pages = 0;
@@ -174,7 +303,13 @@ void filter_tally_write(struct filter_obd *filter, struct page **pages,
         if (nr_pages == 0)
                 return;
 
-        lprocfs_oh_tally_log2(&filter->fo_w_pages, nr_pages);
+        lprocfs_oh_tally_log2(&filter->fo_filter_stats.hist[BRW_R_PAGES + wr],
+                              nr_pages);
+        lprocfs_oh_tally_log2(&fed->fed_brw_stats.hist[BRW_R_PAGES + wr],
+                              nr_pages);
+        if (exp->exp_nid_stats && exp->exp_nid_stats->nid_brw_stats)
+                lprocfs_oh_tally_log2(&exp->exp_nid_stats->nid_brw_stats->hist[BRW_W_PAGES + wr],
+                                      nr_pages);
 
         while (nr_pages-- > 0) {
                 if (last_page && (*pages)->index != (last_page->index + 1))
@@ -188,167 +323,114 @@ void filter_tally_write(struct filter_obd *filter, struct page **pages,
                 }
         }
 
-        lprocfs_oh_tally(&filter->fo_w_discont_pages, discont_pages);
-        lprocfs_oh_tally(&filter->fo_w_discont_blocks, discont_blocks);
-}
-
-void filter_tally_read(struct filter_obd *filter, struct niobuf_local *lnb,
-                       int niocount)
-{
-        struct niobuf_local *end;
-        struct page *last_page = NULL;
-        unsigned long discont_pages = 0;
-        unsigned long discont_blocks = 0;
-
-        if (niocount == 0)
-                return;
-
-        for (end = lnb + niocount; lnb < end && lnb->page; lnb++) {
-                struct page *page = lnb->page;
-                if (last_page) {
-                       if (page->index != (last_page->index + 1))
-                                discont_pages++;
-                        /* XXX not so smart for now */
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
-                        if ((page->buffers && last_page->buffers) &&
-                            (page->buffers->b_blocknr !=
-                             (last_page->buffers->b_blocknr + 1)))
-                                discont_blocks++;
-#else
-#warning "port on 2.6 -bzzz"
-#endif
-                }
-                last_page = page;
+        lprocfs_oh_tally(&filter->fo_filter_stats.hist[BRW_R_DISCONT_PAGES +wr],
+                         discont_pages);
+        lprocfs_oh_tally(&fed->fed_brw_stats.hist[BRW_R_DISCONT_PAGES + wr],
+                         discont_pages);
+        lprocfs_oh_tally(&filter->fo_filter_stats.hist[BRW_R_DISCONT_BLOCKS+wr],
+                         discont_blocks);
+        lprocfs_oh_tally(&fed->fed_brw_stats.hist[BRW_R_DISCONT_BLOCKS + wr],
+                         discont_blocks);
+
+        if (exp->exp_nid_stats && exp->exp_nid_stats->nid_brw_stats) {
+                lprocfs_oh_tally_log2(&exp->exp_nid_stats->nid_brw_stats->hist[BRW_W_DISCONT_PAGES + wr],
+                                      discont_pages);
+                lprocfs_oh_tally_log2(&exp->exp_nid_stats->nid_brw_stats->hist[BRW_W_DISCONT_BLOCKS + wr],
+                                      discont_blocks);
         }
-
-        lprocfs_oh_tally_log2(&filter->fo_r_pages, niocount);
-        lprocfs_oh_tally(&filter->fo_r_discont_pages, discont_pages);
-        lprocfs_oh_tally(&filter->fo_r_discont_blocks, discont_blocks);
 }
 
 #define pct(a,b) (b ? a * 100 / b : 0)
 
-static int filter_brw_stats_seq_show(struct seq_file *seq, void *v)
+static void display_brw_stats(struct seq_file *seq, char *name, char *units,
+        struct obd_histogram *read, struct obd_histogram *write, int log2)
 {
-        struct timeval now;
-        struct obd_device *dev = seq->private;
-        struct filter_obd *filter = &dev->u.filter;
-        unsigned long read_tot = 0, write_tot = 0, read_cum, write_cum;
+        unsigned long read_tot, write_tot, r, w, read_cum = 0, write_cum = 0;
         int i;
 
-        do_gettimeofday(&now);
-
-        /* this sampling races with updates */
-
-        seq_printf(seq, "snapshot_time:         %lu.%lu (secs.usecs)\n",
-                   now.tv_sec, now.tv_usec);
-
-        seq_printf(seq, "\n\t\t\tread\t\t\twrite\n");
-        seq_printf(seq, "pages per brw         brws   %% cum %% |");
-        seq_printf(seq, "       rpcs   %% cum %%\n");
+        seq_printf(seq, "\n%26s read      |     write\n", " ");
+        seq_printf(seq, "%-22s %-5s %% cum %% |  %-5s %% cum %%\n", 
+                   name, units, units);
 
-        read_tot = lprocfs_oh_sum(&filter->fo_r_pages);
-        write_tot = lprocfs_oh_sum(&filter->fo_w_pages);
-
-        read_cum = 0;
-        write_cum = 0;
+        read_tot = lprocfs_oh_sum(read);
+        write_tot = lprocfs_oh_sum(write);
         for (i = 0; i < OBD_HIST_MAX; i++) {
-                unsigned long r = filter->fo_r_pages.oh_buckets[i];
-                unsigned long w = filter->fo_w_pages.oh_buckets[i];
+                r = read->oh_buckets[i];
+                w = write->oh_buckets[i];
                 read_cum += r;
                 write_cum += w;
-                seq_printf(seq, "%d:\t\t%10lu %3lu %3lu   | %10lu %3lu %3lu\n",
-                                 1 << i, r, pct(r, read_tot),
-                                 pct(read_cum, read_tot), w,
-                                 pct(w, write_tot),
-                                 pct(write_cum, write_tot));
+                if (read_cum == 0 && write_cum == 0)
+                        continue;
+
+                if (!log2) 
+                        seq_printf(seq, "%u", i);
+                else if (i < 10)
+                        seq_printf(seq, "%u", 1<<i);
+                else if (i < 20)
+                        seq_printf(seq, "%uK", 1<<(i-10));
+                else
+                        seq_printf(seq, "%uM", 1<<(i-20));
+
+                seq_printf(seq, ":\t\t%10lu %3lu %3lu   | %4lu %3lu %3lu\n",
+                           r, pct(r, read_tot), pct(read_cum, read_tot), 
+                           w, pct(w, write_tot), pct(write_cum, write_tot));
+
                 if (read_cum == read_tot && write_cum == write_tot)
                         break;
         }
+}
 
-        seq_printf(seq, "\n\t\t\tread\t\t\twrite\n");
-        seq_printf(seq, "discont pages        rpcs   %% cum %% |");
-        seq_printf(seq, "       rpcs   %% cum %%\n");
+static void brw_stats_show(struct seq_file *seq, struct brw_stats *brw_stats)
+{
+        struct timeval now;
 
-        read_tot = lprocfs_oh_sum(&filter->fo_r_discont_pages);
-        write_tot = lprocfs_oh_sum(&filter->fo_w_discont_pages);
+        /* this sampling races with updates */
+        do_gettimeofday(&now);
+        seq_printf(seq, "snapshot_time:         %lu.%lu (secs.usecs)\n",
+                   now.tv_sec, now.tv_usec);
 
-        read_cum = 0;
-        write_cum = 0;
+        display_brw_stats(seq, "pages per bulk r/w", "rpcs",
+                          &brw_stats->hist[BRW_R_PAGES],
+                          &brw_stats->hist[BRW_W_PAGES], 1);
 
-        for (i = 0; i < OBD_HIST_MAX; i++) {
-                unsigned long r = filter->fo_r_discont_pages.oh_buckets[i];
-                unsigned long w = filter->fo_w_discont_pages.oh_buckets[i];
-                read_cum += r;
-                write_cum += w;
-                seq_printf(seq, "%d:\t\t%10lu %3lu %3lu   | %10lu %3lu %3lu\n",
-                                 i, r, pct(r, read_tot),
-                                 pct(read_cum, read_tot), w,
-                                 pct(w, write_tot),
-                                 pct(write_cum, write_tot));
-                if (read_cum == read_tot && write_cum == write_tot)
-                        break;
-        }
+        display_brw_stats(seq, "discontiguous pages", "rpcs",
+                          &brw_stats->hist[BRW_R_DISCONT_PAGES],
+                          &brw_stats->hist[BRW_W_DISCONT_PAGES], 0);
 
-        seq_printf(seq, "\n\t\t\tread\t\t\twrite\n");
-        seq_printf(seq, "discont blocks        rpcs   %% cum %% |");
-        seq_printf(seq, "       rpcs   %% cum %%\n");
+        display_brw_stats(seq, "discontiguous blocks", "rpcs",
+                          &brw_stats->hist[BRW_R_DISCONT_BLOCKS],
+                          &brw_stats->hist[BRW_W_DISCONT_BLOCKS], 0);
 
-        read_tot = lprocfs_oh_sum(&filter->fo_r_discont_blocks);
-        write_tot = lprocfs_oh_sum(&filter->fo_w_discont_blocks);
+        display_brw_stats(seq, "disk fragmented I/Os", "ios",
+                          &brw_stats->hist[BRW_R_DIO_FRAGS],
+                          &brw_stats->hist[BRW_W_DIO_FRAGS], 0);
 
-        read_cum = 0;
-        write_cum = 0;
-        for (i = 0; i < OBD_HIST_MAX; i++) {
-                unsigned long r = filter->fo_r_discont_blocks.oh_buckets[i];
-                unsigned long w = filter->fo_w_discont_blocks.oh_buckets[i];
-                read_cum += r;
-                write_cum += w;
-                seq_printf(seq, "%d:\t\t%10lu %3lu %3lu   | %10lu %3lu %3lu\n",
-                                 i, r, pct(r, read_tot),
-                                 pct(read_cum, read_tot), w,
-                                 pct(w, write_tot),
-                                 pct(write_cum, write_tot));
-                if (read_cum == read_tot && write_cum == write_tot)
-                        break;
+        display_brw_stats(seq, "disk I/Os in flight", "ios",
+                          &brw_stats->hist[BRW_R_RPC_HIST],
+                          &brw_stats->hist[BRW_W_RPC_HIST], 0);
+
+        {
+                char title[24];
+                sprintf(title, "I/O time (1/%ds)", HZ);
+                display_brw_stats(seq, title, "ios",
+                                  &brw_stats->hist[BRW_R_IO_TIME],
+                                  &brw_stats->hist[BRW_W_IO_TIME], 1);
         }
 
-        return 0;
+        display_brw_stats(seq, "disk I/O size", "ios",
+                          &brw_stats->hist[BRW_R_DISK_IOSIZE],
+                          &brw_stats->hist[BRW_W_DISK_IOSIZE], 1);
 }
+
 #undef pct
 
-static void *filter_brw_stats_seq_start(struct seq_file *p, loff_t *pos)
-{
-        if (*pos == 0)
-                return (void *)1;
-        return NULL;
-}
-static void *filter_brw_stats_seq_next(struct seq_file *p, void *v, loff_t *pos)
-{
-        ++*pos;
-        return NULL;
-}
-static void filter_brw_stats_seq_stop(struct seq_file *p, void *v)
+static int filter_brw_stats_seq_show(struct seq_file *seq, void *v)
 {
-}
-struct seq_operations filter_brw_stats_seq_sops = {
-        .start = filter_brw_stats_seq_start,
-        .stop = filter_brw_stats_seq_stop,
-        .next = filter_brw_stats_seq_next,
-        .show = filter_brw_stats_seq_show,
-};
+        struct obd_device *dev = seq->private;
+        struct filter_obd *filter = &dev->u.filter;
 
-static int filter_brw_stats_seq_open(struct inode *inode, struct file *file)
-{
-        struct proc_dir_entry *dp = PDE(inode);
-        struct seq_file *seq;
-        int rc;
+        brw_stats_show(seq, &filter->fo_filter_stats);
 
-        rc = seq_open(file, &filter_brw_stats_seq_sops);
-        if (rc)
-                return rc;
-        seq = file->private_data;
-        seq->private = dp->data;
         return 0;
 }
 
@@ -358,25 +440,15 @@ static ssize_t filter_brw_stats_seq_write(struct file *file, const char *buf,
         struct seq_file *seq = file->private_data;
         struct obd_device *dev = seq->private;
         struct filter_obd *filter = &dev->u.filter;
+        int i;
 
-        lprocfs_oh_clear(&filter->fo_r_pages);
-        lprocfs_oh_clear(&filter->fo_w_pages);
-        lprocfs_oh_clear(&filter->fo_r_discont_pages);
-        lprocfs_oh_clear(&filter->fo_w_discont_pages);
-        lprocfs_oh_clear(&filter->fo_r_discont_blocks);
-        lprocfs_oh_clear(&filter->fo_w_discont_blocks);
+        for (i = 0; i < BRW_LAST; i++)
+                lprocfs_oh_clear(&filter->fo_filter_stats.hist[i]);
 
         return len;
 }
 
-struct file_operations filter_brw_stats_fops = {
-        .owner   = THIS_MODULE,
-        .open    = filter_brw_stats_seq_open,
-        .read    = seq_read,
-        .write   = filter_brw_stats_seq_write,
-        .llseek  = seq_lseek,
-        .release = seq_release,
-};
+LPROC_SEQ_FOPS(filter_brw_stats);
 
 int lproc_filter_attach_seqstat(struct obd_device *dev)
 {
@@ -384,7 +456,60 @@ int lproc_filter_attach_seqstat(struct obd_device *dev)
                                       &filter_brw_stats_fops, dev);
 }
 
+static int filter_per_export_stats_seq_show(struct seq_file *seq, void *v)
+{
+        struct filter_export_data *fed = seq->private;
+
+        brw_stats_show(seq, &fed->fed_brw_stats);
+
+        return 0;
+}
+
+static ssize_t filter_per_export_stats_seq_write(struct file *file,
+                                       const char *buf, size_t len, loff_t *off)
+{
+        struct seq_file *seq = file->private_data;
+        struct filter_export_data *fed = seq->private;
+        int i;
 
+        for (i = 0; i < BRW_LAST; i++)
+                lprocfs_oh_clear(&fed->fed_brw_stats.hist[i]);
+
+        return len;
+}
+
+LPROC_SEQ_FOPS(filter_per_export_stats);
+
+void lprocfs_filter_init_vars(struct lprocfs_static_vars *lvars)
+{
+    lvars->module_vars  = lprocfs_filter_module_vars;
+    lvars->obd_vars     = lprocfs_filter_obd_vars;
+}
+
+static int filter_per_nid_stats_seq_show(struct seq_file *seq, void *v)
+{
+        nid_stat_t *tmp = seq->private;
+
+        if (tmp->nid_brw_stats)
+                brw_stats_show(seq, tmp->nid_brw_stats);
+
+        return 0;
+}
+
+static ssize_t filter_per_nid_stats_seq_write(struct file *file,
+                                              const char *buf, size_t len,
+                                              loff_t *off)
+{
+        struct seq_file *seq = file->private_data;
+        nid_stat_t *tmp = seq->private;
+        int i;
+
+        if (tmp->nid_brw_stats)
+                for (i = 0; i < BRW_LAST; i++)
+                        lprocfs_oh_clear(&tmp->nid_brw_stats->hist[i]);
+
+        return len;
+}
 
+LPROC_SEQ_FOPS(filter_per_nid_stats);
 #endif /* LPROCFS */
-LPROCFS_INIT_VARS(filter, lprocfs_module_vars, lprocfs_obd_vars)