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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2015, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/fld/lproc_fld.c
  33  *
  34  * FLD (FIDs Location Database)
  35  *
  36  * Author: Yury Umanets <umka@clusterfs.com>
  37  *      Di Wang <di.wang@whamcloud.com>
  38  */
  39
  40 #define DEBUG_SUBSYSTEM S_FLD
  41
  42 #include "../../include/linux/libcfs/libcfs.h"
  43 #include <linux/module.h>
  44
  45 #include "../include/obd.h"
  46 #include "../include/obd_class.h"
  47 #include "../include/obd_support.h"
  48 #include "../include/lustre_req_layout.h"
  49 #include "../include/lustre_fld.h"
  50 #include "../include/lustre_fid.h"
  51 #include "fld_internal.h"
  52
  53 static int
  54 fld_debugfs_targets_seq_show(struct seq_file *m, void *unused)
  55 {
  56         struct lu_client_fld *fld = (struct lu_client_fld *)m->private;
  57         struct lu_fld_target *target;
  58
  59         spin_lock(&fld->lcf_lock);
  60         list_for_each_entry(target, &fld->lcf_targets, ft_chain)
  61                 seq_printf(m, "%s\n", fld_target_name(target));
  62         spin_unlock(&fld->lcf_lock);
  63
  64         return 0;
  65 }
  66
  67 static int
  68 fld_debugfs_hash_seq_show(struct seq_file *m, void *unused)
  69 {
  70         struct lu_client_fld *fld = (struct lu_client_fld *)m->private;
  71
  72         spin_lock(&fld->lcf_lock);
  73         seq_printf(m, "%s\n", fld->lcf_hash->fh_name);
  74         spin_unlock(&fld->lcf_lock);
  75
  76         return 0;
  77 }
  78
  79 static ssize_t
  80 fld_debugfs_hash_seq_write(struct file *file,
  81                            const char __user *buffer,
  82                            size_t count, loff_t *off)
  83 {
  84         struct lu_client_fld *fld;
  85         struct lu_fld_hash *hash = NULL;
  86         char fh_name[8];
  87         int i;
  88
  89         if (count > sizeof(fh_name))
  90                 return -ENAMETOOLONG;
  91
  92         if (copy_from_user(fh_name, buffer, count) != 0)
  93                 return -EFAULT;
  94
  95         fld = ((struct seq_file *)file->private_data)->private;
  96
  97         for (i = 0; fld_hash[i].fh_name; i++) {
  98                 if (count != strlen(fld_hash[i].fh_name))
  99                         continue;
 100
 101                 if (!strncmp(fld_hash[i].fh_name, fh_name, count)) {
 102                         hash = &fld_hash[i];
 103                         break;
 104                 }
 105         }
 106
 107         if (hash) {
 108                 spin_lock(&fld->lcf_lock);
 109                 fld->lcf_hash = hash;
 110                 spin_unlock(&fld->lcf_lock);
 111
 112                 CDEBUG(D_INFO, "%s: Changed hash to \"%s\"\n",
 113                        fld->lcf_name, hash->fh_name);
 114         }
 115
 116         return count;
 117 }
 118
 119 static ssize_t
 120 fld_debugfs_cache_flush_write(struct file *file, const char __user *buffer,
 121                               size_t count, loff_t *pos)
 122 {
 123         struct lu_client_fld *fld = file->private_data;
 124
 125         fld_cache_flush(fld->lcf_cache);
 126
 127         CDEBUG(D_INFO, "%s: Lookup cache is flushed\n", fld->lcf_name);
 128
 129         return count;
 130 }
 131
 132 static int
 133 fld_debugfs_cache_flush_release(struct inode *inode, struct file *file)
 134 {
 135         file->private_data = NULL;
 136         return 0;
 137 }
 138
 139 static struct file_operations fld_debugfs_cache_flush_fops = {
 140         .owner          = THIS_MODULE,
 141         .open           = simple_open,
 142         .write          = fld_debugfs_cache_flush_write,
 143         .release        = fld_debugfs_cache_flush_release,
 144 };
 145
 146 LPROC_SEQ_FOPS_RO(fld_debugfs_targets);
 147 LPROC_SEQ_FOPS(fld_debugfs_hash);
 148
 149 struct lprocfs_vars fld_client_debugfs_list[] = {
 150         { "targets",     &fld_debugfs_targets_fops },
 151         { "hash",        &fld_debugfs_hash_fops },
 152         { "cache_flush", &fld_debugfs_cache_flush_fops },
 153         { NULL }
 154 };