src/df.c

   1 /**
   2  * collectd - src/df.c
   3  * Copyright (C) 2005-2009  Florian octo Forster
   4  * Copyright (C) 2009       Paul Sadauskas
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; only version 2 of the License is applicable.
   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 for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  18  *
  19  * Authors:
  20  *   Florian octo Forster <octo at verplant.org>
  21  *   Paul Sadauskas <psadauskas at gmail.com>
  22  **/
  23
  24 #include "collectd.h"
  25 #include "common.h"
  26 #include "plugin.h"
  27 #include "configfile.h"
  28 #include "utils_mount.h"
  29 #include "utils_ignorelist.h"
  30
  31 #if HAVE_STATVFS
  32 # if HAVE_SYS_STATVFS_H
  33 #  include <sys/statvfs.h>
  34 # endif
  35 # define STATANYFS statvfs
  36 # define STATANYFS_STR "statvfs"
  37 # define BLOCKSIZE(s) ((s).f_frsize ? (s).f_frsize : (s).f_bsize)
  38 #elif HAVE_STATFS
  39 # if HAVE_SYS_STATFS_H
  40 #  include <sys/statfs.h>
  41 # endif
  42 # define STATANYFS statfs
  43 # define STATANYFS_STR "statfs"
  44 # define BLOCKSIZE(s) (s).f_bsize
  45 #else
  46 # error "No applicable input method."
  47 #endif
  48
  49 static const char *config_keys[] =
  50 {
  51         "Device",
  52         "MountPoint",
  53         "FSType",
  54         "IgnoreSelected",
  55         "ReportByDevice",
  56         "ReportReserved",
  57         "ReportInodes"
  58 };
  59 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
  60
  61 static ignorelist_t *il_device = NULL;
  62 static ignorelist_t *il_mountpoint = NULL;
  63 static ignorelist_t *il_fstype = NULL;
  64
  65 static _Bool by_device = false;
  66 static _Bool report_reserved = false;
  67 static _Bool report_inodes = false;
  68
  69 static int df_init (void)
  70 {
  71         if (il_device == NULL)
  72                 il_device = ignorelist_create (1);
  73         if (il_mountpoint == NULL)
  74                 il_mountpoint = ignorelist_create (1);
  75         if (il_fstype == NULL)
  76                 il_fstype = ignorelist_create (1);
  77
  78         return (0);
  79 }
  80
  81 static int df_config (const char *key, const char *value)
  82 {
  83         df_init ();
  84
  85         if (strcasecmp (key, "Device") == 0)
  86         {
  87                 if (ignorelist_add (il_device, value))
  88                         return (1);
  89                 return (0);
  90         }
  91         else if (strcasecmp (key, "MountPoint") == 0)
  92         {
  93                 if (ignorelist_add (il_mountpoint, value))
  94                         return (1);
  95                 return (0);
  96         }
  97         else if (strcasecmp (key, "FSType") == 0)
  98         {
  99                 if (ignorelist_add (il_fstype, value))
 100                         return (1);
 101                 return (0);
 102         }
 103         else if (strcasecmp (key, "IgnoreSelected") == 0)
 104         {
 105                 if (IS_TRUE (value))
 106                 {
 107                         ignorelist_set_invert (il_device, 0);
 108                         ignorelist_set_invert (il_mountpoint, 0);
 109                         ignorelist_set_invert (il_fstype, 0);
 110                 }
 111                 else
 112                 {
 113                         ignorelist_set_invert (il_device, 1);
 114                         ignorelist_set_invert (il_mountpoint, 1);
 115                         ignorelist_set_invert (il_fstype, 1);
 116                 }
 117                 return (0);
 118         }
 119         else if (strcasecmp (key, "ReportByDevice") == 0)
 120         {
 121                 if (IS_TRUE (value))
 122                         by_device = true;
 123
 124                 return (0);
 125         }
 126         else if (strcasecmp (key, "ReportReserved") == 0)
 127         {
 128                 if (IS_TRUE (value))
 129                         report_reserved = true;
 130                 else
 131                         report_reserved = false;
 132
 133                 return (0);
 134         }
 135         else if (strcasecmp (key, "ReportInodes") == 0)
 136         {
 137                 if (IS_TRUE (value))
 138                         report_inodes = true;
 139                 else
 140                         report_inodes = false;
 141
 142                 return (0);
 143         }
 144
 145
 146         return (-1);
 147 }
 148
 149 static void df_submit_two (char *df_name,
 150                 const char *type,
 151                 gauge_t df_used,
 152                 gauge_t df_free)
 153 {
 154         value_t values[2];
 155         value_list_t vl = VALUE_LIST_INIT;
 156
 157         values[0].gauge = df_used;
 158         values[1].gauge = df_free;
 159
 160         vl.values = values;
 161         vl.values_len = 2;
 162         sstrncpy (vl.host, hostname_g, sizeof (vl.host));
 163         sstrncpy (vl.plugin, "df", sizeof (vl.plugin));
 164         sstrncpy (vl.plugin_instance, "", sizeof (vl.plugin_instance));
 165         sstrncpy (vl.type, type, sizeof (vl.type));
 166         sstrncpy (vl.type_instance, df_name, sizeof (vl.type_instance));
 167
 168         plugin_dispatch_values (&vl);
 169 } /* void df_submit_two */
 170
 171 __attribute__ ((nonnull(2)))
 172 static void df_submit_one (char *plugin_instance,
 173                 const char *type, const char *type_instance,
 174                 gauge_t value)
 175 {
 176         value_t values[1];
 177         value_list_t vl = VALUE_LIST_INIT;
 178
 179         values[0].gauge = value;
 180
 181         vl.values = values;
 182         vl.values_len = 1;
 183         sstrncpy (vl.host, hostname_g, sizeof (vl.host));
 184         sstrncpy (vl.plugin, "df", sizeof (vl.plugin));
 185         if (plugin_instance != NULL)
 186                 sstrncpy (vl.plugin_instance, plugin_instance,
 187                                 sizeof (vl.plugin_instance));
 188         sstrncpy (vl.type, type, sizeof (vl.type));
 189         if (type_instance != NULL)
 190                 sstrncpy (vl.type_instance, type_instance,
 191                                 sizeof (vl.type_instance));
 192
 193         plugin_dispatch_values (&vl);
 194 } /* void df_submit_one */
 195
 196 static int df_read (void)
 197 {
 198 #if HAVE_STATVFS
 199         struct statvfs statbuf;
 200 #elif HAVE_STATFS
 201         struct statfs statbuf;
 202 #endif
 203         /* struct STATANYFS statbuf; */
 204         cu_mount_t *mnt_list;
 205         cu_mount_t *mnt_ptr;
 206
 207         mnt_list = NULL;
 208         if (cu_mount_getlist (&mnt_list) == NULL)
 209         {
 210                 ERROR ("df plugin: cu_mount_getlist failed.");
 211                 return (-1);
 212         }
 213
 214         for (mnt_ptr = mnt_list; mnt_ptr != NULL; mnt_ptr = mnt_ptr->next)
 215         {
 216                 unsigned long long blocksize;
 217                 char disk_name[256];
 218
 219                 if (ignorelist_match (il_device,
 220                                         (mnt_ptr->spec_device != NULL)
 221                                         ? mnt_ptr->spec_device
 222                                         : mnt_ptr->device))
 223                         continue;
 224                 if (ignorelist_match (il_mountpoint, mnt_ptr->dir))
 225                         continue;
 226                 if (ignorelist_match (il_fstype, mnt_ptr->type))
 227                         continue;
 228
 229                 if (STATANYFS (mnt_ptr->dir, &statbuf) < 0)
 230                 {
 231                         char errbuf[1024];
 232                         ERROR (STATANYFS_STR"(%s) failed: %s",
 233                                         mnt_ptr->dir,
 234                                         sstrerror (errno, errbuf,
 235                                                 sizeof (errbuf)));
 236                         continue;
 237                 }
 238
 239                 if (!statbuf.f_blocks)
 240                         continue;
 241
 242                 if (by_device)
 243                 {
 244                         /* eg, /dev/hda1  -- strip off the "/dev/" */
 245                         if (strncmp (mnt_ptr->spec_device, "/dev/", strlen ("/dev/")) == 0)
 246                                 sstrncpy (disk_name, mnt_ptr->spec_device + strlen ("/dev/"), sizeof (disk_name));
 247                         else
 248                                 sstrncpy (disk_name, mnt_ptr->spec_device, sizeof (disk_name));
 249
 250                         if (strlen(disk_name) < 1)
 251                         {
 252                                 DEBUG("df: no device name name for mountpoint %s, skipping", mnt_ptr->dir);
 253                                 continue;
 254                         }
 255                 }
 256                 else
 257                 {
 258                         if (strcmp (mnt_ptr->dir, "/") == 0)
 259                         {
 260                                 if (strcmp (mnt_ptr->type, "rootfs") == 0)
 261                                         continue;
 262                                 sstrncpy (disk_name, "root", sizeof (disk_name));
 263                         }
 264                         else
 265                         {
 266                                 int i, len;
 267
 268                                 sstrncpy (disk_name, mnt_ptr->dir + 1, sizeof (disk_name));
 269                                 len = strlen (disk_name);
 270
 271                                 for (i = 0; i < len; i++)
 272                                         if (disk_name[i] == '/')
 273                                                 disk_name[i] = '-';
 274                         }
 275                 }
 276
 277                 blocksize = BLOCKSIZE(statbuf);
 278
 279                 if (report_reserved)
 280                 {
 281                         uint64_t blk_free;
 282                         uint64_t blk_reserved;
 283                         uint64_t blk_used;
 284
 285                         /*
 286                          * Sanity-check for the values in the struct
 287                          */
 288                         /* Check for negative "available" byes. For example UFS can
 289                          * report negative free space for user. Notice. blk_reserved
 290                          * will start to diminish after this. */
 291 #if HAVE_STATVFS
 292                         /* Cast and temporary variable are needed to avoid
 293                          * compiler warnings.
 294                          * ((struct statvfs).f_bavail is unsigned (POSIX)) */
 295                         int64_t signed_bavail = (int64_t) statbuf.f_bavail;
 296                         if (signed_bavail < 0)
 297                                 statbuf.f_bavail = 0;
 298 #elif HAVE_STATFS
 299                         if (statbuf.f_bavail < 0)
 300                                 statbuf.f_bavail = 0;
 301 #endif
 302                         /* Make sure that f_blocks >= f_bfree >= f_bavail */
 303                         if (statbuf.f_bfree < statbuf.f_bavail)
 304                                 statbuf.f_bfree = statbuf.f_bavail;
 305                         if (statbuf.f_blocks < statbuf.f_bfree)
 306                                 statbuf.f_blocks = statbuf.f_bfree;
 307
 308                         blk_free = (uint64_t) statbuf.f_bavail;
 309                         blk_reserved = (uint64_t) (statbuf.f_bfree - statbuf.f_bavail);
 310                         blk_used = (uint64_t) (statbuf.f_blocks - statbuf.f_bfree);
 311
 312                         df_submit_one (disk_name, "df_complex", "free",
 313                                         (gauge_t) (blk_free * blocksize));
 314                         df_submit_one (disk_name, "df_complex", "reserved",
 315                                         (gauge_t) (blk_reserved * blocksize));
 316                         df_submit_one (disk_name, "df_complex", "used",
 317                                         (gauge_t) (blk_used * blocksize));
 318                 }
 319                 else /* compatibility code */
 320                 {
 321                         gauge_t df_free;
 322                         gauge_t df_used;
 323
 324                         df_free = statbuf.f_bfree * blocksize;
 325                         df_used = (statbuf.f_blocks - statbuf.f_bfree) * blocksize;
 326
 327                         df_submit_two (disk_name, "df", df_used, df_free);
 328                 }
 329
 330                 /* inode handling */
 331                 if (report_inodes)
 332                 {
 333                         uint64_t inode_free;
 334                         uint64_t inode_reserved;
 335                         uint64_t inode_used;
 336
 337                         /* Sanity-check for the values in the struct */
 338                         if (statbuf.f_ffree < statbuf.f_favail)
 339                                 statbuf.f_ffree = statbuf.f_favail;
 340                         if (statbuf.f_files < statbuf.f_ffree)
 341                                 statbuf.f_files = statbuf.f_ffree;
 342
 343                         inode_free = (uint64_t) statbuf.f_favail;
 344                         inode_reserved = (uint64_t) (statbuf.f_ffree - statbuf.f_favail);
 345                         inode_used = (uint64_t) (statbuf.f_files - statbuf.f_ffree);
 346
 347                         df_submit_one (disk_name, "df_inodes", "free",
 348                                         (gauge_t) inode_free);
 349                         df_submit_one (disk_name, "df_inodes", "reserved",
 350                                         (gauge_t) inode_reserved);
 351                         df_submit_one (disk_name, "df_inodes", "used",
 352                                         (gauge_t) inode_used);
 353                 }
 354         }
 355
 356         cu_mount_freelist (mnt_list);
 357
 358         return (0);
 359 } /* int df_read */
 360
 361 void module_register (void)
 362 {
 363         plugin_register_config ("df", df_config,
 364                         config_keys, config_keys_num);
 365         plugin_register_init ("df", df_init);
 366         plugin_register_read ("df", df_read);
 367 } /* void module_register */