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.plugin, "df", sizeof (vl.plugin));
 169         if (plugin_instance != NULL)
 170                 sstrncpy (vl.plugin_instance, plugin_instance,
 171                                 sizeof (vl.plugin_instance));
 172         sstrncpy (vl.type, type, sizeof (vl.type));
 173         if (type_instance != NULL)
 174                 sstrncpy (vl.type_instance, type_instance,
 175                                 sizeof (vl.type_instance));
 176
 177         plugin_dispatch_values (&vl);
 178 } /* void df_submit_one */
 179
 180 static int df_read (void)
 181 {
 182 #if HAVE_STATVFS
 183         struct statvfs statbuf;
 184 #elif HAVE_STATFS
 185         struct statfs statbuf;
 186 #endif
 187         /* struct STATANYFS statbuf; */
 188         cu_mount_t *mnt_list;
 189
 190         mnt_list = NULL;
 191         if (cu_mount_getlist (&mnt_list) == NULL)
 192         {
 193                 ERROR ("df plugin: cu_mount_getlist failed.");
 194                 return (-1);
 195         }
 196
 197         for (cu_mount_t *mnt_ptr = mnt_list; mnt_ptr != NULL; mnt_ptr = mnt_ptr->next)
 198         {
 199                 unsigned long long blocksize;
 200                 char disk_name[256];
 201                 cu_mount_t *dup_ptr;
 202                 uint64_t blk_free;
 203                 uint64_t blk_reserved;
 204                 uint64_t blk_used;
 205
 206                 char const *dev = (mnt_ptr->spec_device != NULL)
 207                         ? mnt_ptr->spec_device
 208                         : mnt_ptr->device;
 209
 210                 if (ignorelist_match (il_device, dev))
 211                         continue;
 212                 if (ignorelist_match (il_mountpoint, mnt_ptr->dir))
 213                         continue;
 214                 if (ignorelist_match (il_fstype, mnt_ptr->type))
 215                         continue;
 216
 217                 /* search for duplicates *in front of* the current mnt_ptr. */
 218                 for (dup_ptr = mnt_list; dup_ptr != NULL; dup_ptr = dup_ptr->next)
 219                 {
 220                         /* No duplicate found: mnt_ptr is the first of its kind. */
 221                         if (dup_ptr == mnt_ptr)
 222                         {
 223                                 dup_ptr = NULL;
 224                                 break;
 225                         }
 226
 227                         /* Duplicate found: leave non-NULL dup_ptr. */
 228                         if (by_device
 229                             && (mnt_ptr->spec_device != NULL)
 230                             && (dup_ptr->spec_device != NULL)
 231                             && (strcmp (mnt_ptr->spec_device, dup_ptr->spec_device) == 0))
 232                                 break;
 233                         else if (!by_device && (strcmp (mnt_ptr->dir, dup_ptr->dir) == 0))
 234                                 break;
 235                 }
 236
 237                 /* ignore duplicates */
 238                 if (dup_ptr != NULL)
 239                         continue;
 240
 241                 if (STATANYFS (mnt_ptr->dir, &statbuf) < 0)
 242                 {
 243                         char errbuf[1024];
 244                         ERROR (STATANYFS_STR"(%s) failed: %s",
 245                                         mnt_ptr->dir,
 246                                         sstrerror (errno, errbuf,
 247                                                 sizeof (errbuf)));
 248                         continue;
 249                 }
 250
 251                 if (!statbuf.f_blocks)
 252                         continue;
 253
 254                 if (by_device)
 255                 {
 256                         /* eg, /dev/hda1  -- strip off the "/dev/" */
 257                         if (strncmp (dev, "/dev/", strlen ("/dev/")) == 0)
 258                                 sstrncpy (disk_name, dev + strlen ("/dev/"), sizeof (disk_name));
 259                         else
 260                                 sstrncpy (disk_name, dev, sizeof (disk_name));
 261
 262                         if (strlen(disk_name) < 1)
 263                         {
 264                                 DEBUG("df: no device name for mountpoint %s, skipping", mnt_ptr->dir);
 265                                 continue;
 266                         }
 267                 }
 268                 else
 269                 {
 270                         if (strcmp (mnt_ptr->dir, "/") == 0)
 271                                 sstrncpy (disk_name, "root", sizeof (disk_name));
 272                         else
 273                         {
 274                                 int len;
 275
 276                                 sstrncpy (disk_name, mnt_ptr->dir + 1, sizeof (disk_name));
 277                                 len = strlen (disk_name);
 278
 279                                 for (int i = 0; i < len; i++)
 280                                         if (disk_name[i] == '/')
 281                                                 disk_name[i] = '-';
 282                         }
 283                 }
 284
 285                 blocksize = BLOCKSIZE(statbuf);
 286
 287                 /*
 288                  * Sanity-check for the values in the struct
 289                  */
 290                 /* Check for negative "available" byes. For example UFS can
 291                  * report negative free space for user. Notice. blk_reserved
 292                  * will start to diminish after this. */
 293 #if HAVE_STATVFS
 294                 /* Cast and temporary variable are needed to avoid
 295                  * compiler warnings.
 296                  * ((struct statvfs).f_bavail is unsigned (POSIX)) */
 297                 int64_t signed_bavail = (int64_t) statbuf.f_bavail;
 298                 if (signed_bavail < 0)
 299                         statbuf.f_bavail = 0;
 300 #elif HAVE_STATFS
 301                 if (statbuf.f_bavail < 0)
 302                         statbuf.f_bavail = 0;
 303 #endif
 304                 /* Make sure that f_blocks >= f_bfree >= f_bavail */
 305                 if (statbuf.f_bfree < statbuf.f_bavail)
 306                         statbuf.f_bfree = statbuf.f_bavail;
 307                 if (statbuf.f_blocks < statbuf.f_bfree)
 308                         statbuf.f_blocks = statbuf.f_bfree;
 309
 310                 blk_free     = (uint64_t) statbuf.f_bavail;
 311                 blk_reserved = (uint64_t) (statbuf.f_bfree - statbuf.f_bavail);
 312                 blk_used     = (uint64_t) (statbuf.f_blocks - statbuf.f_bfree);
 313
 314                 if (values_absolute)
 315                 {
 316                         df_submit_one (disk_name, "df_complex", "free",
 317                                 (gauge_t) (blk_free * blocksize));
 318                         df_submit_one (disk_name, "df_complex", "reserved",
 319                                 (gauge_t) (blk_reserved * blocksize));
 320                         df_submit_one (disk_name, "df_complex", "used",
 321                                 (gauge_t) (blk_used * blocksize));
 322                 }
 323
 324                 if (values_percentage)
 325                 {
 326                         if (statbuf.f_blocks > 0)
 327                                 {
 328                                 df_submit_one (disk_name, "percent_bytes", "free",
 329                                         (gauge_t) ((float_t)(blk_free) / statbuf.f_blocks * 100));
 330                                 df_submit_one (disk_name, "percent_bytes", "reserved",
 331                                         (gauge_t) ((float_t)(blk_reserved) / statbuf.f_blocks * 100));
 332                                 df_submit_one (disk_name, "percent_bytes", "used",
 333                                         (gauge_t) ((float_t)(blk_used) / statbuf.f_blocks * 100));
 334                                 }
 335                         else return (-1);
 336                 }
 337
 338                 /* inode handling */
 339                 if (report_inodes && statbuf.f_files != 0 && statbuf.f_ffree != 0)
 340                 {
 341                         uint64_t inode_free;
 342                         uint64_t inode_reserved;
 343                         uint64_t inode_used;
 344
 345                         /* Sanity-check for the values in the struct */
 346                         if (statbuf.f_ffree < statbuf.f_favail)
 347                                 statbuf.f_ffree = statbuf.f_favail;
 348                         if (statbuf.f_files < statbuf.f_ffree)
 349                                 statbuf.f_files = statbuf.f_ffree;
 350
 351                         inode_free = (uint64_t) statbuf.f_favail;
 352                         inode_reserved = (uint64_t) (statbuf.f_ffree - statbuf.f_favail);
 353                         inode_used = (uint64_t) (statbuf.f_files - statbuf.f_ffree);
 354
 355                         if (values_percentage)
 356                         {
 357                                 if (statbuf.f_files > 0)
 358                                 {
 359                                         df_submit_one (disk_name, "percent_inodes", "free",
 360                                                 (gauge_t) ((float_t)(inode_free) / statbuf.f_files * 100));
 361                                         df_submit_one (disk_name, "percent_inodes", "reserved",
 362                                                 (gauge_t) ((float_t)(inode_reserved) / statbuf.f_files * 100));
 363                                         df_submit_one (disk_name, "percent_inodes", "used",
 364                                                 (gauge_t) ((float_t)(inode_used) / statbuf.f_files * 100));
 365                                 }
 366                                 else return (-1);
 367                         }
 368                         if (values_absolute)
 369                         {
 370                                 df_submit_one (disk_name, "df_inodes", "free",
 371                                                 (gauge_t) inode_free);
 372                                 df_submit_one (disk_name, "df_inodes", "reserved",
 373                                                 (gauge_t) inode_reserved);
 374                                 df_submit_one (disk_name, "df_inodes", "used",
 375                                                 (gauge_t) inode_used);
 376                         }
 377                 }
 378         }
 379
 380         cu_mount_freelist (mnt_list);
 381
 382         return (0);
 383 } /* int df_read */
 384
 385 void module_register (void)
 386 {
 387         plugin_register_config ("df", df_config,
 388                         config_keys, config_keys_num);
 389         plugin_register_init ("df", df_init);
 390         plugin_register_read ("df", df_read);
 391 } /* void module_register */