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 collectd.org>
  21  *   Paul Sadauskas <psadauskas at gmail.com>
  22  **/
  23
  24 #include "collectd.h"
  25
  26 #include "common.h"
  27 #include "plugin.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         "ReportInodes",
  57         "ValuesAbsolute",
  58         "ValuesPercentage"
  59 };
  60 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
  61
  62 static ignorelist_t *il_device = NULL;
  63 static ignorelist_t *il_mountpoint = NULL;
  64 static ignorelist_t *il_fstype = NULL;
  65
  66 static _Bool by_device = 0;
  67 static _Bool report_inodes = 0;
  68 static _Bool values_absolute = 1;
  69 static _Bool values_percentage = 0;
  70
  71 static int df_init (void)
  72 {
  73         if (il_device == NULL)
  74                 il_device = ignorelist_create (1);
  75         if (il_mountpoint == NULL)
  76                 il_mountpoint = ignorelist_create (1);
  77         if (il_fstype == NULL)
  78                 il_fstype = ignorelist_create (1);
  79
  80         return (0);
  81 }
  82
  83 static int df_config (const char *key, const char *value)
  84 {
  85         df_init ();
  86
  87         if (strcasecmp (key, "Device") == 0)
  88         {
  89                 if (ignorelist_add (il_device, value))
  90                         return (1);
  91                 return (0);
  92         }
  93         else if (strcasecmp (key, "MountPoint") == 0)
  94         {
  95                 if (ignorelist_add (il_mountpoint, value))
  96                         return (1);
  97                 return (0);
  98         }
  99         else if (strcasecmp (key, "FSType") == 0)
 100         {
 101                 if (ignorelist_add (il_fstype, value))
 102                         return (1);
 103                 return (0);
 104         }
 105         else if (strcasecmp (key, "IgnoreSelected") == 0)
 106         {
 107                 if (IS_TRUE (value))
 108                 {
 109                         ignorelist_set_invert (il_device, 0);
 110                         ignorelist_set_invert (il_mountpoint, 0);
 111                         ignorelist_set_invert (il_fstype, 0);
 112                 }
 113                 else
 114                 {
 115                         ignorelist_set_invert (il_device, 1);
 116                         ignorelist_set_invert (il_mountpoint, 1);
 117                         ignorelist_set_invert (il_fstype, 1);
 118                 }
 119                 return (0);
 120         }
 121         else if (strcasecmp (key, "ReportByDevice") == 0)
 122         {
 123                 if (IS_TRUE (value))
 124                         by_device = 1;
 125
 126                 return (0);
 127         }
 128         else if (strcasecmp (key, "ReportInodes") == 0)
 129         {
 130                 if (IS_TRUE (value))
 131                         report_inodes = 1;
 132                 else
 133                         report_inodes = 0;
 134
 135                 return (0);
 136         }
 137         else if (strcasecmp (key, "ValuesAbsolute") == 0)
 138         {
 139                 if (IS_TRUE (value))
 140                         values_absolute = 1;
 141                 else
 142                         values_absolute = 0;
 143
 144                 return (0);
 145         }
 146         else if (strcasecmp (key, "ValuesPercentage") == 0)
 147         {
 148                 if (IS_TRUE (value))
 149                         values_percentage = 1;
 150                 else
 151                         values_percentage = 0;
 152
 153                 return (0);
 154         }
 155
 156         return (-1);
 157 }
 158
 159 __attribute__ ((nonnull(2)))
 160 static void df_submit_one (char *plugin_instance,
 161                 const char *type, const char *type_instance,
 162                 gauge_t value)
 163 {
 164         value_list_t vl = VALUE_LIST_INIT;
 165
 166         vl.values = &(value_t) { .gauge = value };
 167         vl.values_len = 1;
 168         sstrncpy (vl.host, hostname_g, sizeof (vl.host));
 169         sstrncpy (vl.plugin, "df", sizeof (vl.plugin));
 170         if (plugin_instance != NULL)
 171                 sstrncpy (vl.plugin_instance, plugin_instance,
 172                                 sizeof (vl.plugin_instance));
 173         sstrncpy (vl.type, type, sizeof (vl.type));
 174         if (type_instance != NULL)
 175                 sstrncpy (vl.type_instance, type_instance,
 176                                 sizeof (vl.type_instance));
 177
 178         plugin_dispatch_values (&vl);
 179 } /* void df_submit_one */
 180
 181 static int df_read (void)
 182 {
 183 #if HAVE_STATVFS
 184         struct statvfs statbuf;
 185 #elif HAVE_STATFS
 186         struct statfs statbuf;
 187 #endif
 188         /* struct STATANYFS statbuf; */
 189         cu_mount_t *mnt_list;
 190
 191         mnt_list = NULL;
 192         if (cu_mount_getlist (&mnt_list) == NULL)
 193         {
 194                 ERROR ("df plugin: cu_mount_getlist failed.");
 195                 return (-1);
 196         }
 197
 198         for (cu_mount_t *mnt_ptr = mnt_list; mnt_ptr != NULL; mnt_ptr = mnt_ptr->next)
 199         {
 200                 unsigned long long blocksize;
 201                 char disk_name[256];
 202                 cu_mount_t *dup_ptr;
 203                 uint64_t blk_free;
 204                 uint64_t blk_reserved;
 205                 uint64_t blk_used;
 206
 207                 char const *dev = (mnt_ptr->spec_device != NULL)
 208                         ? mnt_ptr->spec_device
 209                         : mnt_ptr->device;
 210
 211                 if (ignorelist_match (il_device, dev))
 212                         continue;
 213                 if (ignorelist_match (il_mountpoint, mnt_ptr->dir))
 214                         continue;
 215                 if (ignorelist_match (il_fstype, mnt_ptr->type))
 216                         continue;
 217
 218                 /* search for duplicates *in front of* the current mnt_ptr. */
 219                 for (dup_ptr = mnt_list; dup_ptr != NULL; dup_ptr = dup_ptr->next)
 220                 {
 221                         /* No duplicate found: mnt_ptr is the first of its kind. */
 222                         if (dup_ptr == mnt_ptr)
 223                         {
 224                                 dup_ptr = NULL;
 225                                 break;
 226                         }
 227
 228                         /* Duplicate found: leave non-NULL dup_ptr. */
 229                         if (by_device
 230                             && (mnt_ptr->spec_device != NULL)
 231                             && (dup_ptr->spec_device != NULL)
 232                             && (strcmp (mnt_ptr->spec_device, dup_ptr->spec_device) == 0))
 233                                 break;
 234                         else if (!by_device && (strcmp (mnt_ptr->dir, dup_ptr->dir) == 0))
 235                                 break;
 236                 }
 237
 238                 /* ignore duplicates */
 239                 if (dup_ptr != NULL)
 240                         continue;
 241
 242                 if (STATANYFS (mnt_ptr->dir, &statbuf) < 0)
 243                 {
 244                         char errbuf[1024];
 245                         ERROR (STATANYFS_STR"(%s) failed: %s",
 246                                         mnt_ptr->dir,
 247                                         sstrerror (errno, errbuf,
 248                                                 sizeof (errbuf)));
 249                         continue;
 250                 }
 251
 252                 if (!statbuf.f_blocks)
 253                         continue;
 254
 255                 if (by_device)
 256                 {
 257                         /* eg, /dev/hda1  -- strip off the "/dev/" */
 258                         if (strncmp (dev, "/dev/", strlen ("/dev/")) == 0)
 259                                 sstrncpy (disk_name, dev + strlen ("/dev/"), sizeof (disk_name));
 260                         else
 261                                 sstrncpy (disk_name, dev, sizeof (disk_name));
 262
 263                         if (strlen(disk_name) < 1)
 264                         {
 265                                 DEBUG("df: no device name for mountpoint %s, skipping", mnt_ptr->dir);
 266                                 continue;
 267                         }
 268                 }
 269                 else
 270                 {
 271                         if (strcmp (mnt_ptr->dir, "/") == 0)
 272                                 sstrncpy (disk_name, "root", sizeof (disk_name));
 273                         else
 274                         {
 275                                 int len;
 276
 277                                 sstrncpy (disk_name, mnt_ptr->dir + 1, sizeof (disk_name));
 278                                 len = strlen (disk_name);
 279
 280                                 for (int i = 0; i < len; i++)
 281                                         if (disk_name[i] == '/')
 282                                                 disk_name[i] = '-';
 283                         }
 284                 }
 285
 286                 blocksize = BLOCKSIZE(statbuf);
 287
 288                 /*
 289                  * Sanity-check for the values in the struct
 290                  */
 291                 /* Check for negative "available" byes. For example UFS can
 292                  * report negative free space for user. Notice. blk_reserved
 293                  * will start to diminish after this. */
 294 #if HAVE_STATVFS
 295                 /* Cast and temporary variable are needed to avoid
 296                  * compiler warnings.
 297                  * ((struct statvfs).f_bavail is unsigned (POSIX)) */
 298                 int64_t signed_bavail = (int64_t) statbuf.f_bavail;
 299                 if (signed_bavail < 0)
 300                         statbuf.f_bavail = 0;
 301 #elif HAVE_STATFS
 302                 if (statbuf.f_bavail < 0)
 303                         statbuf.f_bavail = 0;
 304 #endif
 305                 /* Make sure that f_blocks >= f_bfree >= f_bavail */
 306                 if (statbuf.f_bfree < statbuf.f_bavail)
 307                         statbuf.f_bfree = statbuf.f_bavail;
 308                 if (statbuf.f_blocks < statbuf.f_bfree)
 309                         statbuf.f_blocks = statbuf.f_bfree;
 310
 311                 blk_free     = (uint64_t) statbuf.f_bavail;
 312                 blk_reserved = (uint64_t) (statbuf.f_bfree - statbuf.f_bavail);
 313                 blk_used     = (uint64_t) (statbuf.f_blocks - statbuf.f_bfree);
 314
 315                 if (values_absolute)
 316                 {
 317                         df_submit_one (disk_name, "df_complex", "free",
 318                                 (gauge_t) (blk_free * blocksize));
 319                         df_submit_one (disk_name, "df_complex", "reserved",
 320                                 (gauge_t) (blk_reserved * blocksize));
 321                         df_submit_one (disk_name, "df_complex", "used",
 322                                 (gauge_t) (blk_used * blocksize));
 323                 }
 324
 325                 if (values_percentage)
 326                 {
 327                         if (statbuf.f_blocks > 0)
 328                                 {
 329                                 df_submit_one (disk_name, "percent_bytes", "free",
 330                                         (gauge_t) ((float_t)(blk_free) / statbuf.f_blocks * 100));
 331                                 df_submit_one (disk_name, "percent_bytes", "reserved",
 332                                         (gauge_t) ((float_t)(blk_reserved) / statbuf.f_blocks * 100));
 333                                 df_submit_one (disk_name, "percent_bytes", "used",
 334                                         (gauge_t) ((float_t)(blk_used) / statbuf.f_blocks * 100));
 335                                 }
 336                         else return (-1);
 337                 }
 338
 339                 /* inode handling */
 340                 if (report_inodes && statbuf.f_files != 0 && statbuf.f_ffree != 0)
 341                 {
 342                         uint64_t inode_free;
 343                         uint64_t inode_reserved;
 344                         uint64_t inode_used;
 345
 346                         /* Sanity-check for the values in the struct */
 347                         if (statbuf.f_ffree < statbuf.f_favail)
 348                                 statbuf.f_ffree = statbuf.f_favail;
 349                         if (statbuf.f_files < statbuf.f_ffree)
 350                                 statbuf.f_files = statbuf.f_ffree;
 351
 352                         inode_free = (uint64_t) statbuf.f_favail;
 353                         inode_reserved = (uint64_t) (statbuf.f_ffree - statbuf.f_favail);
 354                         inode_used = (uint64_t) (statbuf.f_files - statbuf.f_ffree);
 355
 356                         if (values_percentage)
 357                         {
 358                                 if (statbuf.f_files > 0)
 359                                 {
 360                                         df_submit_one (disk_name, "percent_inodes", "free",
 361                                                 (gauge_t) ((float_t)(inode_free) / statbuf.f_files * 100));
 362                                         df_submit_one (disk_name, "percent_inodes", "reserved",
 363                                                 (gauge_t) ((float_t)(inode_reserved) / statbuf.f_files * 100));
 364                                         df_submit_one (disk_name, "percent_inodes", "used",
 365                                                 (gauge_t) ((float_t)(inode_used) / statbuf.f_files * 100));
 366                                 }
 367                                 else return (-1);
 368                         }
 369                         if (values_absolute)
 370                         {
 371                                 df_submit_one (disk_name, "df_inodes", "free",
 372                                                 (gauge_t) inode_free);
 373                                 df_submit_one (disk_name, "df_inodes", "reserved",
 374                                                 (gauge_t) inode_reserved);
 375                                 df_submit_one (disk_name, "df_inodes", "used",
 376                                                 (gauge_t) inode_used);
 377                         }
 378                 }
 379         }
 380
 381         cu_mount_freelist (mnt_list);
 382
 383         return (0);
 384 } /* int df_read */
 385
 386 void module_register (void)
 387 {
 388         plugin_register_config ("df", df_config,
 389                         config_keys, config_keys_num);
 390         plugin_register_init ("df", df_init);
 391         plugin_register_read ("df", df_read);
 392 } /* void module_register */