df plugin: Fix the duplicate detection.

Not that multiple devices could be mounted at the same mount point ... I think.

Fixes: #1402

diff --git a/src/df.c b/src/df.c
index 3f9eabd..74292d7 100644 (file)
--- a/src/df.c
+++ b/src/df.c
@@ -204,7 +204,7 @@ static int df_read (void)
        {
                unsigned long long blocksize;
                char disk_name[256];
-        cu_mount_t *mnt_dup_ptr;
+               cu_mount_t *dup_ptr;
                uint64_t blk_free;
                uint64_t blk_reserved;
                uint64_t blk_used;
@@ -220,20 +220,27 @@ static int df_read (void)
                if (ignorelist_match (il_fstype, mnt_ptr->type))
                        continue;
 
-               /* ignore duplicates */
-               for (mnt_dup_ptr = mnt_ptr; mnt_dup_ptr != NULL; mnt_dup_ptr = mnt_dup_ptr->next)
+               /* search for duplicates *in front of* the current mnt_ptr. */
+               for (dup_ptr = mnt_list; dup_ptr != NULL; dup_ptr = dup_ptr->next)
                {
-                       if (by_device) {
-                               if (strcmp (mnt_ptr->spec_device, mnt_dup_ptr->spec_device) == 0)
-                                       continue;
-                       }
-                       else
+                       /* No duplicate found: mnt_ptr is the first of its kind. */
+                       if (dup_ptr == mnt_ptr)
                        {
-                               if (strcmp (mnt_ptr->dir, mnt_dup_ptr->dir) == 0)
-                                       continue;
+                               dup_ptr = NULL;
+                               break;
                        }
+
+                       /* Duplicate found: leave non-NULL dup_ptr. */
+                       if (by_device && (strcmp (mnt_ptr->spec_device, dup_ptr->spec_device) == 0))
+                               break;
+                       else if (!by_device && (strcmp (mnt_ptr->dir, dup_ptr->dir) == 0))
+                               break;
                }
 
+               /* ignore duplicates */
+               if (dup_ptr != NULL)
+                       continue;
+
                if (STATANYFS (mnt_ptr->dir, &statbuf) < 0)
                {
                        char errbuf[1024];