lustre/fld/lproc_fld.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  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/fld/lproc_fld.c
  37  *
  38  * FLD (FIDs Location Database)
  39  *
  40  * Author: Yury Umanets <umka@clusterfs.com>
  41  */
  42
  43 #ifndef EXPORT_SYMTAB
  44 # define EXPORT_SYMTAB
  45 #endif
  46 #define DEBUG_SUBSYSTEM S_FLD
  47
  48 #ifdef __KERNEL__
  49 # include <libcfs/libcfs.h>
  50 # include <linux/module.h>
  51 #else /* __KERNEL__ */
  52 # include <liblustre.h>
  53 #endif
  54
  55 #include <obd.h>
  56 #include <obd_class.h>
  57 #include <dt_object.h>
  58 #include <md_object.h>
  59 #include <obd_support.h>
  60 #include <lustre_req_layout.h>
  61 #include <lustre_fld.h>
  62 #include "fld_internal.h"
  63
  64 #ifdef LPROCFS
  65 static int
  66 fld_proc_read_targets(char *page, char **start, off_t off,
  67                       int count, int *eof, void *data)
  68 {
  69         struct lu_client_fld *fld = (struct lu_client_fld *)data;
  70         struct lu_fld_target *target;
  71         int total = 0, rc;
  72         ENTRY;
  73
  74         LASSERT(fld != NULL);
  75
  76         cfs_spin_lock(&fld->lcf_lock);
  77         cfs_list_for_each_entry(target,
  78                                 &fld->lcf_targets, ft_chain)
  79         {
  80                 rc = snprintf(page, count, "%s\n",
  81                               fld_target_name(target));
  82                 page += rc;
  83                 count -= rc;
  84                 total += rc;
  85                 if (count == 0)
  86                         break;
  87         }
  88         cfs_spin_unlock(&fld->lcf_lock);
  89         RETURN(total);
  90 }
  91
  92 static int
  93 fld_proc_read_hash(char *page, char **start, off_t off,
  94                    int count, int *eof, void *data)
  95 {
  96         struct lu_client_fld *fld = (struct lu_client_fld *)data;
  97         int rc;
  98         ENTRY;
  99
 100         LASSERT(fld != NULL);
 101
 102         cfs_spin_lock(&fld->lcf_lock);
 103         rc = snprintf(page, count, "%s\n",
 104                       fld->lcf_hash->fh_name);
 105         cfs_spin_unlock(&fld->lcf_lock);
 106
 107         RETURN(rc);
 108 }
 109
 110 static int
 111 fld_proc_write_hash(struct file *file, const char *buffer,
 112                     unsigned long count, void *data)
 113 {
 114         struct lu_client_fld *fld = (struct lu_client_fld *)data;
 115         struct lu_fld_hash *hash = NULL;
 116         int i;
 117         ENTRY;
 118
 119         LASSERT(fld != NULL);
 120
 121         for (i = 0; fld_hash[i].fh_name != NULL; i++) {
 122                 if (count != strlen(fld_hash[i].fh_name))
 123                         continue;
 124
 125                 if (!strncmp(fld_hash[i].fh_name, buffer, count)) {
 126                         hash = &fld_hash[i];
 127                         break;
 128                 }
 129         }
 130
 131         if (hash != NULL) {
 132                 cfs_spin_lock(&fld->lcf_lock);
 133                 fld->lcf_hash = hash;
 134                 cfs_spin_unlock(&fld->lcf_lock);
 135
 136                 CDEBUG(D_INFO, "%s: Changed hash to \"%s\"\n",
 137                        fld->lcf_name, hash->fh_name);
 138         }
 139
 140         RETURN(count);
 141 }
 142
 143 static int
 144 fld_proc_write_cache_flush(struct file *file, const char *buffer,
 145                            unsigned long count, void *data)
 146 {
 147         struct lu_client_fld *fld = (struct lu_client_fld *)data;
 148         ENTRY;
 149
 150         LASSERT(fld != NULL);
 151
 152         fld_cache_flush(fld->lcf_cache);
 153
 154         CDEBUG(D_INFO, "%s: Lookup cache is flushed\n", fld->lcf_name);
 155
 156         RETURN(count);
 157 }
 158
 159 struct lprocfs_vars fld_server_proc_list[] = {
 160         { NULL }};
 161
 162 struct lprocfs_vars fld_client_proc_list[] = {
 163         { "targets",     fld_proc_read_targets, NULL, NULL },
 164         { "hash",        fld_proc_read_hash, fld_proc_write_hash, NULL },
 165         { "cache_flush", NULL, fld_proc_write_cache_flush, NULL },
 166         { NULL }};
 167 #endif