kernel/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 "../../include/linux/libcfs/libcfs.h"
  47 #include <linux/module.h>
  48
  49 #include "../include/obd.h"
  50 #include "../include/obd_class.h"
  51 #include "../include/dt_object.h"
  52 #include "../include/obd_support.h"
  53 #include "../include/lustre_req_layout.h"
  54 #include "../include/lustre_fld.h"
  55 #include "../include/lustre_fid.h"
  56 #include "fld_internal.h"
  57
  58 static int
  59 fld_proc_targets_seq_show(struct seq_file *m, void *unused)
  60 {
  61         struct lu_client_fld *fld = (struct lu_client_fld *)m->private;
  62         struct lu_fld_target *target;
  63
  64         LASSERT(fld != NULL);
  65
  66         spin_lock(&fld->lcf_lock);
  67         list_for_each_entry(target,
  68                                 &fld->lcf_targets, ft_chain)
  69                 seq_printf(m, "%s\n", fld_target_name(target));
  70         spin_unlock(&fld->lcf_lock);
  71
  72         return 0;
  73 }
  74
  75 static int
  76 fld_proc_hash_seq_show(struct seq_file *m, void *unused)
  77 {
  78         struct lu_client_fld *fld = (struct lu_client_fld *)m->private;
  79
  80         LASSERT(fld != NULL);
  81
  82         spin_lock(&fld->lcf_lock);
  83         seq_printf(m, "%s\n", fld->lcf_hash->fh_name);
  84         spin_unlock(&fld->lcf_lock);
  85
  86         return 0;
  87 }
  88
  89 static ssize_t
  90 fld_proc_hash_seq_write(struct file *file,
  91                                 const char __user *buffer,
  92                                 size_t count, loff_t *off)
  93 {
  94         struct lu_client_fld *fld;
  95         struct lu_fld_hash *hash = NULL;
  96         char fh_name[8];
  97         int i;
  98
  99         if (count > sizeof(fh_name))
 100                 return -ENAMETOOLONG;
 101
 102         if (copy_from_user(fh_name, buffer, count) != 0)
 103                 return -EFAULT;
 104
 105         fld = ((struct seq_file *)file->private_data)->private;
 106         LASSERT(fld != NULL);
 107
 108         for (i = 0; fld_hash[i].fh_name != NULL; i++) {
 109                 if (count != strlen(fld_hash[i].fh_name))
 110                         continue;
 111
 112                 if (!strncmp(fld_hash[i].fh_name, fh_name, count)) {
 113                         hash = &fld_hash[i];
 114                         break;
 115                 }
 116         }
 117
 118         if (hash != NULL) {
 119                 spin_lock(&fld->lcf_lock);
 120                 fld->lcf_hash = hash;
 121                 spin_unlock(&fld->lcf_lock);
 122
 123                 CDEBUG(D_INFO, "%s: Changed hash to \"%s\"\n",
 124                        fld->lcf_name, hash->fh_name);
 125         }
 126
 127         return count;
 128 }
 129
 130 static ssize_t
 131 fld_proc_cache_flush_write(struct file *file, const char __user *buffer,
 132                                size_t count, loff_t *pos)
 133 {
 134         struct lu_client_fld *fld = file->private_data;
 135
 136         LASSERT(fld != NULL);
 137
 138         fld_cache_flush(fld->lcf_cache);
 139
 140         CDEBUG(D_INFO, "%s: Lookup cache is flushed\n", fld->lcf_name);
 141
 142         return count;
 143 }
 144
 145 static int fld_proc_cache_flush_open(struct inode *inode, struct file *file)
 146 {
 147         file->private_data = PDE_DATA(inode);
 148         return 0;
 149 }
 150
 151 static int fld_proc_cache_flush_release(struct inode *inode, struct file *file)
 152 {
 153         file->private_data = NULL;
 154         return 0;
 155 }
 156
 157 static struct file_operations fld_proc_cache_flush_fops = {
 158         .owner          = THIS_MODULE,
 159         .open           = fld_proc_cache_flush_open,
 160         .write          = fld_proc_cache_flush_write,
 161         .release        = fld_proc_cache_flush_release,
 162 };
 163
 164 LPROC_SEQ_FOPS_RO(fld_proc_targets);
 165 LPROC_SEQ_FOPS(fld_proc_hash);
 166
 167 struct lprocfs_vars fld_client_proc_list[] = {
 168         { "targets", &fld_proc_targets_fops },
 169         { "hash", &fld_proc_hash_fops },
 170         { "cache_flush", &fld_proc_cache_flush_fops },
 171         { NULL }
 172 };