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 static int
  60 fld_proc_targets_seq_show(struct seq_file *m, void *unused)
  61 {
  62         struct lu_client_fld *fld = (struct lu_client_fld *)m->private;
  63         struct lu_fld_target *target;
  64
  65         LASSERT(fld != NULL);
  66
  67         spin_lock(&fld->lcf_lock);
  68         list_for_each_entry(target,
  69                                 &fld->lcf_targets, ft_chain)
  70                 seq_printf(m, "%s\n", fld_target_name(target));
  71         spin_unlock(&fld->lcf_lock);
  72
  73         return 0;
  74 }
  75
  76 static int
  77 fld_proc_hash_seq_show(struct seq_file *m, void *unused)
  78 {
  79         struct lu_client_fld *fld = (struct lu_client_fld *)m->private;
  80
  81         LASSERT(fld != NULL);
  82
  83         spin_lock(&fld->lcf_lock);
  84         seq_printf(m, "%s\n", fld->lcf_hash->fh_name);
  85         spin_unlock(&fld->lcf_lock);
  86
  87         return 0;
  88 }
  89
  90 static ssize_t
  91 fld_proc_hash_seq_write(struct file *file, const char *buffer,
  92                         size_t count, loff_t *off)
  93 {
  94         struct lu_client_fld *fld = ((struct seq_file *)file->private_data)->private;
  95         struct lu_fld_hash *hash = NULL;
  96         int i;
  97
  98         LASSERT(fld != NULL);
  99
 100         for (i = 0; fld_hash[i].fh_name != NULL; i++) {
 101                 if (count != strlen(fld_hash[i].fh_name))
 102                         continue;
 103
 104                 if (!strncmp(fld_hash[i].fh_name, buffer, count)) {
 105                         hash = &fld_hash[i];
 106                         break;
 107                 }
 108         }
 109
 110         if (hash != NULL) {
 111                 spin_lock(&fld->lcf_lock);
 112                 fld->lcf_hash = hash;
 113                 spin_unlock(&fld->lcf_lock);
 114
 115                 CDEBUG(D_INFO, "%s: Changed hash to \"%s\"\n",
 116                        fld->lcf_name, hash->fh_name);
 117         }
 118
 119         return count;
 120 }
 121
 122 static ssize_t
 123 fld_proc_cache_flush_write(struct file *file, const char __user *buffer,
 124                                size_t count, loff_t *pos)
 125 {
 126         struct lu_client_fld *fld = file->private_data;
 127
 128         LASSERT(fld != NULL);
 129
 130         fld_cache_flush(fld->lcf_cache);
 131
 132         CDEBUG(D_INFO, "%s: Lookup cache is flushed\n", fld->lcf_name);
 133
 134         return count;
 135 }
 136
 137 static int fld_proc_cache_flush_open(struct inode *inode, struct file *file)
 138 {
 139         file->private_data = PDE_DATA(inode);
 140         return 0;
 141 }
 142
 143 static int fld_proc_cache_flush_release(struct inode *inode, struct file *file)
 144 {
 145         file->private_data = NULL;
 146         return 0;
 147 }
 148
 149 struct file_operations fld_proc_cache_flush_fops = {
 150         .owner          = THIS_MODULE,
 151         .open           = fld_proc_cache_flush_open,
 152         .write          = fld_proc_cache_flush_write,
 153         .release        = fld_proc_cache_flush_release,
 154 };
 155
 156 LPROC_SEQ_FOPS_RO(fld_proc_targets);
 157 LPROC_SEQ_FOPS(fld_proc_hash);
 158
 159 struct lprocfs_vars fld_client_proc_list[] = {
 160         { "targets", &fld_proc_targets_fops },
 161         { "hash", &fld_proc_hash_fops },
 162         { "cache_flush", &fld_proc_cache_flush_fops },
 163         { NULL }};