drivers/staging/lustre/lustre/fid/lproc_fid.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) 2011, 2012, 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/fid/lproc_fid.c
  37  *
  38  * Lustre Sequence Manager
  39  *
  40  * Author: Yury Umanets <umka@clusterfs.com>
  41  */
  42
  43 #define DEBUG_SUBSYSTEM S_FID
  44
  45 #include "../../include/linux/libcfs/libcfs.h"
  46 #include <linux/module.h>
  47
  48 #include "../include/obd.h"
  49 #include "../include/obd_class.h"
  50 #include "../include/dt_object.h"
  51 #include "../include/md_object.h"
  52 #include "../include/obd_support.h"
  53 #include "../include/lustre_req_layout.h"
  54 #include "../include/lustre_fid.h"
  55 #include "fid_internal.h"
  56
  57 /* Format: [0x64BIT_INT - 0x64BIT_INT] + 32 bytes just in case */
  58 #define MAX_FID_RANGE_STRLEN (32 + 2 * 2 * sizeof(__u64))
  59 /*
  60  * Note: this function is only used for testing, it is no safe for production
  61  * use.
  62  */
  63 static int lprocfs_fid_write_common(const char __user *buffer, size_t count,
  64                                     struct lu_seq_range *range)
  65 {
  66         struct lu_seq_range tmp;
  67         int rc;
  68         char kernbuf[MAX_FID_RANGE_STRLEN];
  69
  70         LASSERT(range != NULL);
  71
  72         if (count >= sizeof(kernbuf))
  73                 return -EINVAL;
  74
  75         if (copy_from_user(kernbuf, buffer, count))
  76                 return -EFAULT;
  77
  78         kernbuf[count] = 0;
  79
  80         if (count == 5 && strcmp(kernbuf, "clear") == 0) {
  81                 memset(range, 0, sizeof(*range));
  82                 return count;
  83         }
  84
  85         /* of the form "[0x0000000240000400 - 0x000000028000400]" */
  86         rc = sscanf(kernbuf, "[%llx - %llx]\n",
  87                     (long long unsigned *)&tmp.lsr_start,
  88                     (long long unsigned *)&tmp.lsr_end);
  89         if (!range_is_sane(&tmp) || range_is_zero(&tmp) ||
  90             tmp.lsr_start < range->lsr_start || tmp.lsr_end > range->lsr_end)
  91                 return -EINVAL;
  92         *range = tmp;
  93         return count;
  94 }
  95
  96 /* Client side procfs stuff */
  97 static ssize_t lprocfs_fid_space_seq_write(struct file *file,
  98                                            const char __user *buffer,
  99                                            size_t count, loff_t *off)
 100 {
 101         struct lu_client_seq *seq;
 102         int rc;
 103
 104         seq = ((struct seq_file *)file->private_data)->private;
 105         LASSERT(seq != NULL);
 106
 107         mutex_lock(&seq->lcs_mutex);
 108         rc = lprocfs_fid_write_common(buffer, count, &seq->lcs_space);
 109
 110         if (rc == 0) {
 111                 CDEBUG(D_INFO, "%s: Space: "DRANGE"\n",
 112                        seq->lcs_name, PRANGE(&seq->lcs_space));
 113         }
 114
 115         mutex_unlock(&seq->lcs_mutex);
 116
 117         return count;
 118 }
 119
 120 static int
 121 lprocfs_fid_space_seq_show(struct seq_file *m, void *unused)
 122 {
 123         struct lu_client_seq *seq = (struct lu_client_seq *)m->private;
 124         int rc;
 125
 126         LASSERT(seq != NULL);
 127
 128         mutex_lock(&seq->lcs_mutex);
 129         rc = seq_printf(m, "[%#llx - %#llx]:%x:%s\n", PRANGE(&seq->lcs_space));
 130         mutex_unlock(&seq->lcs_mutex);
 131
 132         return rc;
 133 }
 134
 135 static ssize_t lprocfs_fid_width_seq_write(struct file *file,
 136                                            const char __user *buffer,
 137                                            size_t count, loff_t *off)
 138 {
 139         struct lu_client_seq *seq;
 140         __u64  max;
 141         int rc, val;
 142
 143         seq = ((struct seq_file *)file->private_data)->private;
 144         LASSERT(seq != NULL);
 145
 146         rc = lprocfs_write_helper(buffer, count, &val);
 147         if (rc)
 148                 return rc;
 149
 150         mutex_lock(&seq->lcs_mutex);
 151         if (seq->lcs_type == LUSTRE_SEQ_DATA)
 152                 max = LUSTRE_DATA_SEQ_MAX_WIDTH;
 153         else
 154                 max = LUSTRE_METADATA_SEQ_MAX_WIDTH;
 155
 156         if (val <= max && val > 0) {
 157                 seq->lcs_width = val;
 158
 159                 if (rc == 0) {
 160                         CDEBUG(D_INFO, "%s: Sequence size: %llu\n",
 161                                seq->lcs_name, seq->lcs_width);
 162                 }
 163         }
 164
 165         mutex_unlock(&seq->lcs_mutex);
 166
 167         return count;
 168 }
 169
 170 static int
 171 lprocfs_fid_width_seq_show(struct seq_file *m, void *unused)
 172 {
 173         struct lu_client_seq *seq = (struct lu_client_seq *)m->private;
 174         int rc;
 175
 176         LASSERT(seq != NULL);
 177
 178         mutex_lock(&seq->lcs_mutex);
 179         rc = seq_printf(m, "%llu\n", seq->lcs_width);
 180         mutex_unlock(&seq->lcs_mutex);
 181
 182         return rc;
 183 }
 184
 185 static int
 186 lprocfs_fid_fid_seq_show(struct seq_file *m, void *unused)
 187 {
 188         struct lu_client_seq *seq = (struct lu_client_seq *)m->private;
 189         int rc;
 190
 191         LASSERT(seq != NULL);
 192
 193         mutex_lock(&seq->lcs_mutex);
 194         rc = seq_printf(m, DFID"\n", PFID(&seq->lcs_fid));
 195         mutex_unlock(&seq->lcs_mutex);
 196
 197         return rc;
 198 }
 199
 200 static int
 201 lprocfs_fid_server_seq_show(struct seq_file *m, void *unused)
 202 {
 203         struct lu_client_seq *seq = (struct lu_client_seq *)m->private;
 204         struct client_obd *cli;
 205         int rc;
 206
 207         LASSERT(seq != NULL);
 208
 209         if (seq->lcs_exp != NULL) {
 210                 cli = &seq->lcs_exp->exp_obd->u.cli;
 211                 rc = seq_printf(m, "%s\n", cli->cl_target_uuid.uuid);
 212         } else {
 213                 rc = seq_printf(m, "%s\n", seq->lcs_srv->lss_name);
 214         }
 215         return rc;
 216 }
 217
 218 LPROC_SEQ_FOPS(lprocfs_fid_space);
 219 LPROC_SEQ_FOPS(lprocfs_fid_width);
 220 LPROC_SEQ_FOPS_RO(lprocfs_fid_server);
 221 LPROC_SEQ_FOPS_RO(lprocfs_fid_fid);
 222
 223 struct lprocfs_vars seq_client_proc_list[] = {
 224         { "space", &lprocfs_fid_space_fops },
 225         { "width", &lprocfs_fid_width_fops },
 226         { "server", &lprocfs_fid_server_fops },
 227         { "fid", &lprocfs_fid_fid_fops },
 228         { NULL }
 229 };