drivers/staging/lustre/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  * Copyright (c) 2012, 2013, 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/fld/lproc_fld.c
  37  *
  38  * FLD (FIDs Location Database)
  39  *
  40  * Author: Yury Umanets <umka@clusterfs.com>
  41  *      Di Wang <di.wang@whamcloud.com>
  42  */
  43
  44 #define DEBUG_SUBSYSTEM S_FLD
  45
  46 # include <linux/libcfs/libcfs.h>
  47 # include <linux/module.h>
  48
  49 #include <obd.h>
  50 #include <obd_class.h>
  51 #include <dt_object.h>
  52 #include <md_object.h>
  53 #include <obd_support.h>
  54 #include <lustre_req_layout.h>
  55 #include <lustre_fld.h>
  56 #include <lustre_fid.h>
  57 #include "fld_internal.h"
  58
  59 #ifdef LPROCFS
  60 static int
  61 fld_proc_targets_seq_show(struct seq_file *m, void *unused)
  62 {
  63         struct lu_client_fld *fld = (struct lu_client_fld *)m->private;
  64         struct lu_fld_target *target;
  65         ENTRY;
  66
  67         LASSERT(fld != NULL);
  68
  69         spin_lock(&fld->lcf_lock);
  70         list_for_each_entry(target,
  71                                 &fld->lcf_targets, ft_chain)
  72                 seq_printf(m, "%s\n", fld_target_name(target));
  73         spin_unlock(&fld->lcf_lock);
  74
  75         RETURN(0);
  76 }
  77
  78 static int
  79 fld_proc_hash_seq_show(struct seq_file *m, void *unused)
  80 {
  81         struct lu_client_fld *fld = (struct lu_client_fld *)m->private;
  82         ENTRY;
  83
  84         LASSERT(fld != NULL);
  85
  86         spin_lock(&fld->lcf_lock);
  87         seq_printf(m, "%s\n", fld->lcf_hash->fh_name);
  88         spin_unlock(&fld->lcf_lock);
  89
  90         RETURN(0);
  91 }
  92
  93 static ssize_t
  94 fld_proc_hash_seq_write(struct file *file, const char *buffer,
  95                         size_t count, loff_t *off)
  96 {
  97         struct lu_client_fld *fld = ((struct seq_file *)file->private_data)->private;
  98         struct lu_fld_hash *hash = NULL;
  99         int i;
 100         ENTRY;
 101
 102         LASSERT(fld != NULL);
 103
 104         for (i = 0; fld_hash[i].fh_name != NULL; i++) {
 105                 if (count != strlen(fld_hash[i].fh_name))
 106                         continue;
 107
 108                 if (!strncmp(fld_hash[i].fh_name, buffer, count)) {
 109                         hash = &fld_hash[i];
 110                         break;
 111                 }
 112         }
 113
 114         if (hash != NULL) {
 115                 spin_lock(&fld->lcf_lock);
 116                 fld->lcf_hash = hash;
 117                 spin_unlock(&fld->lcf_lock);
 118
 119                 CDEBUG(D_INFO, "%s: Changed hash to \"%s\"\n",
 120                        fld->lcf_name, hash->fh_name);
 121         }
 122
 123         RETURN(count);
 124 }
 125
 126 static ssize_t
 127 fld_proc_cache_flush_write(struct file *file, const char __user *buffer,
 128                                size_t count, loff_t *pos)
 129 {
 130         struct lu_client_fld *fld = file->private_data;
 131         ENTRY;
 132
 133         LASSERT(fld != NULL);
 134
 135         fld_cache_flush(fld->lcf_cache);
 136
 137         CDEBUG(D_INFO, "%s: Lookup cache is flushed\n", fld->lcf_name);
 138
 139         RETURN(count);
 140 }
 141
 142 static int fld_proc_cache_flush_open(struct inode *inode, struct file *file)
 143 {
 144         file->private_data = PDE_DATA(inode);
 145         return 0;
 146 }
 147
 148 static int fld_proc_cache_flush_release(struct inode *inode, struct file *file)
 149 {
 150         file->private_data = NULL;
 151         return 0;
 152 }
 153
 154 struct file_operations fld_proc_cache_flush_fops = {
 155         .owner          = THIS_MODULE,
 156         .open           = fld_proc_cache_flush_open,
 157         .write          = fld_proc_cache_flush_write,
 158         .release        = fld_proc_cache_flush_release,
 159 };
 160
 161 LPROC_SEQ_FOPS_RO(fld_proc_targets);
 162 LPROC_SEQ_FOPS(fld_proc_hash);
 163
 164 struct lprocfs_vars fld_client_proc_list[] = {
 165         { "targets", &fld_proc_targets_fops },
 166         { "hash", &fld_proc_hash_fops },
 167         { "cache_flush", &fld_proc_cache_flush_fops },
 168         { NULL }};
 169
 170 #endif /* LPROCFS */