lustre/fld/lproc_fld.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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30 /*
  31  * This file is part of Lustre, http://www.lustre.org/
  32  * Lustre is a trademark of Sun Microsystems, Inc.
  33  *
  34  * lustre/fld/lproc_fld.c
  35  *
  36  * FLD (FIDs Location Database)
  37  *
  38  * Author: Yury Umanets <umka@clusterfs.com>
  39  */
  40
  41 #ifndef EXPORT_SYMTAB
  42 # define EXPORT_SYMTAB
  43 #endif
  44 #define DEBUG_SUBSYSTEM S_FLD
  45
  46 #ifdef __KERNEL__
  47 # include <libcfs/libcfs.h>
  48 # include <linux/module.h>
  49 #else /* __KERNEL__ */
  50 # include <liblustre.h>
  51 #endif
  52
  53 #include <obd.h>
  54 #include <obd_class.h>
  55 #include <dt_object.h>
  56 #include <md_object.h>
  57 #include <obd_support.h>
  58 #include <lustre_req_layout.h>
  59 #include <lustre_fld.h>
  60 #include "fld_internal.h"
  61
  62 #ifdef LPROCFS
  63 static int
  64 fld_proc_read_targets(char *page, char **start, off_t off,
  65                       int count, int *eof, void *data)
  66 {
  67         struct lu_client_fld *fld = (struct lu_client_fld *)data;
  68         struct lu_fld_target *target;
  69         int total = 0, rc;
  70         ENTRY;
  71
  72         LASSERT(fld != NULL);
  73
  74         cfs_spin_lock(&fld->lcf_lock);
  75         cfs_list_for_each_entry(target,
  76                                 &fld->lcf_targets, ft_chain)
  77         {
  78                 rc = snprintf(page, count, "%s\n",
  79                               fld_target_name(target));
  80                 page += rc;
  81                 count -= rc;
  82                 total += rc;
  83                 if (count == 0)
  84                         break;
  85         }
  86         cfs_spin_unlock(&fld->lcf_lock);
  87         RETURN(total);
  88 }
  89
  90 static int
  91 fld_proc_read_hash(char *page, char **start, off_t off,
  92                    int count, int *eof, void *data)
  93 {
  94         struct lu_client_fld *fld = (struct lu_client_fld *)data;
  95         int rc;
  96         ENTRY;
  97
  98         LASSERT(fld != NULL);
  99
 100         cfs_spin_lock(&fld->lcf_lock);
 101         rc = snprintf(page, count, "%s\n",
 102                       fld->lcf_hash->fh_name);
 103         cfs_spin_unlock(&fld->lcf_lock);
 104
 105         RETURN(rc);
 106 }
 107
 108 static int
 109 fld_proc_write_hash(struct file *file, const char *buffer,
 110                     unsigned long count, void *data)
 111 {
 112         struct lu_client_fld *fld = (struct lu_client_fld *)data;
 113         struct lu_fld_hash *hash = NULL;
 114         int i;
 115         ENTRY;
 116
 117         LASSERT(fld != NULL);
 118
 119         for (i = 0; fld_hash[i].fh_name != NULL; i++) {
 120                 if (count != strlen(fld_hash[i].fh_name))
 121                         continue;
 122
 123                 if (!strncmp(fld_hash[i].fh_name, buffer, count)) {
 124                         hash = &fld_hash[i];
 125                         break;
 126                 }
 127         }
 128
 129         if (hash != NULL) {
 130                 cfs_spin_lock(&fld->lcf_lock);
 131                 fld->lcf_hash = hash;
 132                 cfs_spin_unlock(&fld->lcf_lock);
 133
 134                 CDEBUG(D_INFO, "%s: Changed hash to \"%s\"\n",
 135                        fld->lcf_name, hash->fh_name);
 136         }
 137
 138         RETURN(count);
 139 }
 140
 141 static int
 142 fld_proc_write_cache_flush(struct file *file, const char *buffer,
 143                            unsigned long count, void *data)
 144 {
 145         struct lu_client_fld *fld = (struct lu_client_fld *)data;
 146         ENTRY;
 147
 148         LASSERT(fld != NULL);
 149
 150         fld_cache_flush(fld->lcf_cache);
 151
 152         CDEBUG(D_INFO, "%s: Lookup cache is flushed\n", fld->lcf_name);
 153
 154         RETURN(count);
 155 }
 156
 157 struct lprocfs_vars fld_server_proc_list[] = {
 158         { NULL }};
 159
 160 struct lprocfs_vars fld_client_proc_list[] = {
 161         { "targets",     fld_proc_read_targets, NULL, NULL },
 162         { "hash",        fld_proc_read_hash, fld_proc_write_hash, NULL },
 163         { "cache_flush", NULL, fld_proc_write_cache_flush, NULL },
 164         { NULL }};
 165 #endif