drivers/staging/lustre/lustre/lmv/lproc_lmv.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) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 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
  33 #define DEBUG_SUBSYSTEM S_CLASS
  34
  35 #include <linux/seq_file.h>
  36 #include <linux/statfs.h>
  37 #include "../include/lprocfs_status.h"
  38 #include "../include/obd_class.h"
  39 #include "lmv_internal.h"
  40
  41 static ssize_t numobd_show(struct kobject *kobj, struct attribute *attr,
  42                            char *buf)
  43 {
  44         struct obd_device *dev = container_of(kobj, struct obd_device,
  45                                               obd_kobj);
  46         struct lmv_desc *desc;
  47
  48         desc = &dev->u.lmv.desc;
  49         return sprintf(buf, "%u\n", desc->ld_tgt_count);
  50 }
  51 LUSTRE_RO_ATTR(numobd);
  52
  53 static const char *placement_name[] = {
  54         [PLACEMENT_CHAR_POLICY] = "CHAR",
  55         [PLACEMENT_NID_POLICY]  = "NID",
  56         [PLACEMENT_INVAL_POLICY]  = "INVAL"
  57 };
  58
  59 static enum placement_policy placement_name2policy(char *name, int len)
  60 {
  61         int                  i;
  62
  63         for (i = 0; i < PLACEMENT_MAX_POLICY; i++) {
  64                 if (!strncmp(placement_name[i], name, len))
  65                         return i;
  66         }
  67         return PLACEMENT_INVAL_POLICY;
  68 }
  69
  70 static const char *placement_policy2name(enum placement_policy placement)
  71 {
  72         LASSERT(placement < PLACEMENT_MAX_POLICY);
  73         return placement_name[placement];
  74 }
  75
  76 static ssize_t placement_show(struct kobject *kobj, struct attribute *attr,
  77                               char *buf)
  78 {
  79         struct obd_device *dev = container_of(kobj, struct obd_device,
  80                                               obd_kobj);
  81         struct lmv_obd *lmv;
  82
  83         lmv = &dev->u.lmv;
  84         return sprintf(buf, "%s\n", placement_policy2name(lmv->lmv_placement));
  85 }
  86
  87 #define MAX_POLICY_STRING_SIZE 64
  88
  89 static ssize_t placement_store(struct kobject *kobj, struct attribute *attr,
  90                                const char *buffer,
  91                                size_t count)
  92 {
  93         struct obd_device *dev = container_of(kobj, struct obd_device,
  94                                               obd_kobj);
  95         char dummy[MAX_POLICY_STRING_SIZE + 1];
  96         enum placement_policy policy;
  97         struct lmv_obd *lmv = &dev->u.lmv;
  98
  99         memcpy(dummy, buffer, MAX_POLICY_STRING_SIZE);
 100
 101         if (count > MAX_POLICY_STRING_SIZE)
 102                 count = MAX_POLICY_STRING_SIZE;
 103
 104         if (dummy[count - 1] == '\n')
 105                 count--;
 106         dummy[count] = '\0';
 107
 108         policy = placement_name2policy(dummy, count);
 109         if (policy != PLACEMENT_INVAL_POLICY) {
 110                 spin_lock(&lmv->lmv_lock);
 111                 lmv->lmv_placement = policy;
 112                 spin_unlock(&lmv->lmv_lock);
 113         } else {
 114                 return -EINVAL;
 115         }
 116         return count;
 117 }
 118 LUSTRE_RW_ATTR(placement);
 119
 120 static ssize_t activeobd_show(struct kobject *kobj, struct attribute *attr,
 121                               char *buf)
 122 {
 123         struct obd_device *dev = container_of(kobj, struct obd_device,
 124                                               obd_kobj);
 125         struct lmv_desc *desc;
 126
 127         desc = &dev->u.lmv.desc;
 128         return sprintf(buf, "%u\n", desc->ld_active_tgt_count);
 129 }
 130 LUSTRE_RO_ATTR(activeobd);
 131
 132 static int lmv_desc_uuid_seq_show(struct seq_file *m, void *v)
 133 {
 134         struct obd_device *dev = (struct obd_device *)m->private;
 135         struct lmv_obd    *lmv;
 136
 137         LASSERT(dev);
 138         lmv = &dev->u.lmv;
 139         seq_printf(m, "%s\n", lmv->desc.ld_uuid.uuid);
 140         return 0;
 141 }
 142
 143 LPROC_SEQ_FOPS_RO(lmv_desc_uuid);
 144
 145 static void *lmv_tgt_seq_start(struct seq_file *p, loff_t *pos)
 146 {
 147         struct obd_device       *dev = p->private;
 148         struct lmv_obd    *lmv = &dev->u.lmv;
 149
 150         return (*pos >= lmv->desc.ld_tgt_count) ? NULL : lmv->tgts[*pos];
 151 }
 152
 153 static void lmv_tgt_seq_stop(struct seq_file *p, void *v)
 154 {
 155         return;
 156 }
 157
 158 static void *lmv_tgt_seq_next(struct seq_file *p, void *v, loff_t *pos)
 159 {
 160         struct obd_device       *dev = p->private;
 161         struct lmv_obd    *lmv = &dev->u.lmv;
 162         ++*pos;
 163         return (*pos >= lmv->desc.ld_tgt_count) ? NULL : lmv->tgts[*pos];
 164 }
 165
 166 static int lmv_tgt_seq_show(struct seq_file *p, void *v)
 167 {
 168         struct lmv_tgt_desc     *tgt = v;
 169
 170         if (!tgt)
 171                 return 0;
 172         seq_printf(p, "%d: %s %sACTIVE\n",
 173                    tgt->ltd_idx, tgt->ltd_uuid.uuid,
 174                    tgt->ltd_active ? "" : "IN");
 175         return 0;
 176 }
 177
 178 static const struct seq_operations lmv_tgt_sops = {
 179         .start           = lmv_tgt_seq_start,
 180         .stop             = lmv_tgt_seq_stop,
 181         .next             = lmv_tgt_seq_next,
 182         .show             = lmv_tgt_seq_show,
 183 };
 184
 185 static int lmv_target_seq_open(struct inode *inode, struct file *file)
 186 {
 187         struct seq_file  *seq;
 188         int                  rc;
 189
 190         rc = seq_open(file, &lmv_tgt_sops);
 191         if (rc)
 192                 return rc;
 193
 194         seq = file->private_data;
 195         seq->private = inode->i_private;
 196
 197         return 0;
 198 }
 199
 200 static struct lprocfs_vars lprocfs_lmv_obd_vars[] = {
 201         { "desc_uuid",    &lmv_desc_uuid_fops,    NULL, 0 },
 202         { NULL }
 203 };
 204
 205 struct file_operations lmv_proc_target_fops = {
 206         .owner          = THIS_MODULE,
 207         .open            = lmv_target_seq_open,
 208         .read            = seq_read,
 209         .llseek        = seq_lseek,
 210         .release              = seq_release,
 211 };
 212
 213 static struct attribute *lmv_attrs[] = {
 214         &lustre_attr_activeobd.attr,
 215         &lustre_attr_numobd.attr,
 216         &lustre_attr_placement.attr,
 217         NULL,
 218 };
 219
 220 static struct attribute_group lmv_attr_group = {
 221         .attrs = lmv_attrs,
 222 };
 223
 224 void lprocfs_lmv_init_vars(struct lprocfs_static_vars *lvars)
 225 {
 226         lvars->sysfs_vars     = &lmv_attr_group;
 227         lvars->obd_vars       = lprocfs_lmv_obd_vars;
 228 }