{GPL, other}: Relicense to MIT license.

[collectd.git] / src / df.c

diff --git a/src/df.c b/src/df.c
index 4b3cba0..a6fa526 100644 (file)
--- a/src/df.c
+++ b/src/df.c
@@ -17,7 +17,7 @@
  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  *
  * Authors:
- *   Florian octo Forster <octo at verplant.org>
+ *   Florian octo Forster <octo at collectd.org>
  *   Paul Sadauskas <psadauskas at gmail.com>
  **/
 
@@ -33,12 +33,14 @@
 #  include <sys/statvfs.h>
 # endif
 # define STATANYFS statvfs
+# define STATANYFS_STR "statvfs"
 # define BLOCKSIZE(s) ((s).f_frsize ? (s).f_frsize : (s).f_bsize)
 #elif HAVE_STATFS
 # if HAVE_SYS_STATFS_H
 #  include <sys/statfs.h>
 # endif
 # define STATANYFS statfs
+# define STATANYFS_STR "statfs"
 # define BLOCKSIZE(s) (s).f_bsize
 #else
 # error "No applicable input method."
@@ -52,7 +54,9 @@ static const char *config_keys[] =
        "IgnoreSelected",
        "ReportByDevice",
        "ReportReserved",
-       "ReportInodes"
+       "ReportInodes",
+       "ValuesAbsolute",
+       "ValuesPercentage"
 };
 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
 
@@ -62,6 +66,8 @@ static ignorelist_t *il_fstype = NULL;
 
 static _Bool by_device = 0;
 static _Bool report_inodes = 0;
+static _Bool values_absolute = 1;
+static _Bool values_percentage = 0;
 
 static int df_init (void)
 {
@@ -129,7 +135,24 @@ static int df_config (const char *key, const char *value)
 
                return (0);
        }
+       else if (strcasecmp (key, "ValuesAbsolute") == 0)
+       {
+               if (IS_TRUE (value))
+                       values_absolute = 1;
+               else
+                       values_absolute = 0;
 
+               return (0);
+       }
+       else if (strcasecmp (key, "ValuesPercentage") == 0)
+       {
+               if (IS_TRUE (value))
+                       values_percentage = 1;
+               else
+                       values_percentage = 0;
+
+               return (0);
+       }
 
        return (-1);
 }
@@ -198,7 +221,8 @@ static int df_read (void)
                if (STATANYFS (mnt_ptr->dir, &statbuf) < 0)
                {
                        char errbuf[1024];
-                       ERROR ("statv?fs failed: %s",
+                       ERROR (STATANYFS_STR"(%s) failed: %s",
+                                       mnt_ptr->dir,
                                        sstrerror (errno, errbuf,
                                                sizeof (errbuf)));
                        continue;
@@ -207,7 +231,7 @@ static int df_read (void)
                if (!statbuf.f_blocks)
                        continue;
 
-               if (by_device) 
+               if (by_device)
                {
                        /* eg, /dev/hda1  -- strip off the "/dev/" */
                        if (strncmp (mnt_ptr->spec_device, "/dev/", strlen ("/dev/")) == 0)
@@ -215,16 +239,18 @@ static int df_read (void)
                        else
                                sstrncpy (disk_name, mnt_ptr->spec_device, sizeof (disk_name));
 
-                       if (strlen(disk_name) < 1) 
+                       if (strlen(disk_name) < 1)
                        {
-                               DEBUG("df: no device name name for mountpoint %s, skipping", mnt_ptr->dir);
+                               DEBUG("df: no device name for mountpoint %s, skipping", mnt_ptr->dir);
                                continue;
                        }
-               } 
-               else 
+               }
+               else
                {
                        if (strcmp (mnt_ptr->dir, "/") == 0)
                        {
+                               if (strcmp (mnt_ptr->type, "rootfs") == 0)
+                                       continue;
                                sstrncpy (disk_name, "root", sizeof (disk_name));
                        }
                        else
@@ -242,7 +268,24 @@ static int df_read (void)
 
                blocksize = BLOCKSIZE(statbuf);
 
-               /* Sanity-check for the values in the struct */
+               /*
+                * Sanity-check for the values in the struct
+                */
+               /* Check for negative "available" byes. For example UFS can
+                * report negative free space for user. Notice. blk_reserved
+                * will start to diminish after this. */
+#if HAVE_STATVFS
+               /* Cast and temporary variable are needed to avoid
+                * compiler warnings.
+                * ((struct statvfs).f_bavail is unsigned (POSIX)) */
+               int64_t signed_bavail = (int64_t) statbuf.f_bavail;
+               if (signed_bavail < 0)
+                       statbuf.f_bavail = 0;
+#elif HAVE_STATFS
+               if (statbuf.f_bavail < 0)
+                       statbuf.f_bavail = 0;
+#endif
+               /* Make sure that f_blocks >= f_bfree >= f_bavail */
                if (statbuf.f_bfree < statbuf.f_bavail)
                        statbuf.f_bfree = statbuf.f_bavail;
                if (statbuf.f_blocks < statbuf.f_bfree)
@@ -252,12 +295,29 @@ static int df_read (void)
                blk_reserved = (uint64_t) (statbuf.f_bfree - statbuf.f_bavail);
                blk_used     = (uint64_t) (statbuf.f_blocks - statbuf.f_bfree);
 
-               df_submit_one (disk_name, "df_complex", "free",
+               if (values_absolute)
+               {
+                       df_submit_one (disk_name, "df_complex", "free",
                                (gauge_t) (blk_free * blocksize));
-               df_submit_one (disk_name, "df_complex", "reserved",
+                       df_submit_one (disk_name, "df_complex", "reserved",
                                (gauge_t) (blk_reserved * blocksize));
-               df_submit_one (disk_name, "df_complex", "used",
+                       df_submit_one (disk_name, "df_complex", "used",
                                (gauge_t) (blk_used * blocksize));
+               }
+
+               if (values_percentage)
+               {
+                       if (statbuf.f_blocks > 0)
+                               {
+                               df_submit_one (disk_name, "percent_bytes", "free",
+                                       (gauge_t) ((float_t)(blk_free) / statbuf.f_blocks * 100));
+                               df_submit_one (disk_name, "percent_bytes", "reserved",
+                                       (gauge_t) ((float_t)(blk_reserved) / statbuf.f_blocks * 100));
+                               df_submit_one (disk_name, "percent_bytes", "used",
+                                       (gauge_t) ((float_t)(blk_used) / statbuf.f_blocks * 100));
+                               }
+                       else return (-1);
+               }
 
                /* inode handling */
                if (report_inodes)
@@ -275,13 +335,29 @@ static int df_read (void)
                        inode_free = (uint64_t) statbuf.f_favail;
                        inode_reserved = (uint64_t) (statbuf.f_ffree - statbuf.f_favail);
                        inode_used = (uint64_t) (statbuf.f_files - statbuf.f_ffree);
-                       
-                       df_submit_one (disk_name, "df_inodes", "free",
-                                       (gauge_t) inode_free);
-                       df_submit_one (disk_name, "df_inodes", "reserved",
-                                       (gauge_t) inode_reserved);
-                       df_submit_one (disk_name, "df_inodes", "used",
-                                       (gauge_t) inode_used);
+
+                       if (values_percentage)
+                       {
+                               if (statbuf.f_files > 0)
+                               {
+                                       df_submit_one (disk_name, "percent_inodes", "free",
+                                               (gauge_t) ((float_t)(inode_free) / statbuf.f_files * 100));
+                                       df_submit_one (disk_name, "percent_inodes", "reserved",
+                                               (gauge_t) ((float_t)(inode_reserved) / statbuf.f_files * 100));
+                                       df_submit_one (disk_name, "percent_inodes", "used",
+                                               (gauge_t) ((float_t)(inode_used) / statbuf.f_files * 100));
+                               }
+                               else return (-1);
+                       }
+                       if (values_absolute)
+                       {
+                               df_submit_one (disk_name, "df_inodes", "free",
+                                               (gauge_t) inode_free);
+                               df_submit_one (disk_name, "df_inodes", "reserved",
+                                               (gauge_t) inode_reserved);
+                               df_submit_one (disk_name, "df_inodes", "used",
+                                               (gauge_t) inode_used);
+                       }
                }
        }