kernel/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.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) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 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
  37 #define DEBUG_SUBSYSTEM S_CLASS
  38
  39 #include <linux/seq_file.h>
  40 #include <linux/statfs.h>
  41 #include "../include/lprocfs_status.h"
  42 #include "../include/obd_class.h"
  43 #include "lmv_internal.h"
  44
  45 static ssize_t numobd_show(struct kobject *kobj, struct attribute *attr,
  46                            char *buf)
  47 {
  48         struct obd_device *dev = container_of(kobj, struct obd_device,
  49                                               obd_kobj);
  50         struct lmv_desc *desc;
  51
  52         desc = &dev->u.lmv.desc;
  53         return sprintf(buf, "%u\n", desc->ld_tgt_count);
  54 }
  55 LUSTRE_RO_ATTR(numobd);
  56
  57 static const char *placement_name[] = {
  58         [PLACEMENT_CHAR_POLICY] = "CHAR",
  59         [PLACEMENT_NID_POLICY]  = "NID",
  60         [PLACEMENT_INVAL_POLICY]  = "INVAL"
  61 };
  62
  63 static enum placement_policy placement_name2policy(char *name, int len)
  64 {
  65         int                  i;
  66
  67         for (i = 0; i < PLACEMENT_MAX_POLICY; i++) {
  68                 if (!strncmp(placement_name[i], name, len))
  69                         return i;
  70         }
  71         return PLACEMENT_INVAL_POLICY;
  72 }
  73
  74 static const char *placement_policy2name(enum placement_policy placement)
  75 {
  76         LASSERT(placement < PLACEMENT_MAX_POLICY);
  77         return placement_name[placement];
  78 }
  79
  80 static ssize_t placement_show(struct kobject *kobj, struct attribute *attr,
  81                               char *buf)
  82 {
  83         struct obd_device *dev = container_of(kobj, struct obd_device,
  84                                               obd_kobj);
  85         struct lmv_obd *lmv;
  86
  87         lmv = &dev->u.lmv;
  88         return sprintf(buf, "%s\n", placement_policy2name(lmv->lmv_placement));
  89 }
  90
  91 #define MAX_POLICY_STRING_SIZE 64
  92
  93 static ssize_t placement_store(struct kobject *kobj, struct attribute *attr,
  94                                const char *buffer,
  95                                size_t count)
  96 {
  97         struct obd_device *dev = container_of(kobj, struct obd_device,
  98                                               obd_kobj);
  99         char dummy[MAX_POLICY_STRING_SIZE + 1];
 100         enum placement_policy policy;
 101         struct lmv_obd *lmv = &dev->u.lmv;
 102
 103         memcpy(dummy, buffer, MAX_POLICY_STRING_SIZE);
 104
 105         if (count > MAX_POLICY_STRING_SIZE)
 106                 count = MAX_POLICY_STRING_SIZE;
 107
 108         if (dummy[count - 1] == '\n')
 109                 count--;
 110         dummy[count] = '\0';
 111
 112         policy = placement_name2policy(dummy, count);
 113         if (policy != PLACEMENT_INVAL_POLICY) {
 114                 spin_lock(&lmv->lmv_lock);
 115                 lmv->lmv_placement = policy;
 116                 spin_unlock(&lmv->lmv_lock);
 117         } else {
 118                 return -EINVAL;
 119         }
 120         return count;
 121 }
 122 LUSTRE_RW_ATTR(placement);
 123
 124 static ssize_t activeobd_show(struct kobject *kobj, struct attribute *attr,
 125                               char *buf)
 126 {
 127         struct obd_device *dev = container_of(kobj, struct obd_device,
 128                                               obd_kobj);
 129         struct lmv_desc *desc;
 130
 131         desc = &dev->u.lmv.desc;
 132         return sprintf(buf, "%u\n", desc->ld_active_tgt_count);
 133 }
 134 LUSTRE_RO_ATTR(activeobd);
 135
 136 static int lmv_desc_uuid_seq_show(struct seq_file *m, void *v)
 137 {
 138         struct obd_device *dev = (struct obd_device *)m->private;
 139         struct lmv_obd    *lmv;
 140
 141         LASSERT(dev != NULL);
 142         lmv = &dev->u.lmv;
 143         seq_printf(m, "%s\n", lmv->desc.ld_uuid.uuid);
 144         return 0;
 145 }
 146
 147 LPROC_SEQ_FOPS_RO(lmv_desc_uuid);
 148
 149 static void *lmv_tgt_seq_start(struct seq_file *p, loff_t *pos)
 150 {
 151         struct obd_device       *dev = p->private;
 152         struct lmv_obd    *lmv = &dev->u.lmv;
 153
 154         return (*pos >= lmv->desc.ld_tgt_count) ? NULL : lmv->tgts[*pos];
 155 }
 156
 157 static void lmv_tgt_seq_stop(struct seq_file *p, void *v)
 158 {
 159         return;
 160 }
 161
 162 static void *lmv_tgt_seq_next(struct seq_file *p, void *v, loff_t *pos)
 163 {
 164         struct obd_device       *dev = p->private;
 165         struct lmv_obd    *lmv = &dev->u.lmv;
 166         ++*pos;
 167         return (*pos >= lmv->desc.ld_tgt_count) ? NULL : lmv->tgts[*pos];
 168 }
 169
 170 static int lmv_tgt_seq_show(struct seq_file *p, void *v)
 171 {
 172         struct lmv_tgt_desc     *tgt = v;
 173
 174         if (tgt == NULL)
 175                 return 0;
 176         seq_printf(p, "%d: %s %sACTIVE\n",
 177                    tgt->ltd_idx, tgt->ltd_uuid.uuid,
 178                    tgt->ltd_active ? "" : "IN");
 179         return 0;
 180 }
 181
 182 static const struct seq_operations lmv_tgt_sops = {
 183         .start           = lmv_tgt_seq_start,
 184         .stop             = lmv_tgt_seq_stop,
 185         .next             = lmv_tgt_seq_next,
 186         .show             = lmv_tgt_seq_show,
 187 };
 188
 189 static int lmv_target_seq_open(struct inode *inode, struct file *file)
 190 {
 191         struct seq_file  *seq;
 192         int                  rc;
 193
 194         rc = seq_open(file, &lmv_tgt_sops);
 195         if (rc)
 196                 return rc;
 197
 198         seq = file->private_data;
 199         seq->private = inode->i_private;
 200
 201         return 0;
 202 }
 203
 204 static struct lprocfs_vars lprocfs_lmv_obd_vars[] = {
 205         { "desc_uuid",    &lmv_desc_uuid_fops,    NULL, 0 },
 206         { NULL }
 207 };
 208
 209 struct file_operations lmv_proc_target_fops = {
 210         .owner          = THIS_MODULE,
 211         .open            = lmv_target_seq_open,
 212         .read            = seq_read,
 213         .llseek        = seq_lseek,
 214         .release              = seq_release,
 215 };
 216
 217 static struct attribute *lmv_attrs[] = {
 218         &lustre_attr_activeobd.attr,
 219         &lustre_attr_numobd.attr,
 220         &lustre_attr_placement.attr,
 221         NULL,
 222 };
 223
 224 static struct attribute_group lmv_attr_group = {
 225         .attrs = lmv_attrs,
 226 };
 227
 228 void lprocfs_lmv_init_vars(struct lprocfs_static_vars *lvars)
 229 {
 230         lvars->sysfs_vars     = &lmv_attr_group;
 231         lvars->obd_vars       = lprocfs_lmv_obd_vars;
 232 }