X-Git-Url: https://git.octo.it/?p=collectd.git;a=blobdiff_plain;f=src%2Fdf.c;h=41a03cbf6280067815419d8802c5d431c0fd239f;hp=5391f50c852f8dea77e620683c1a2d5e51fd3eac;hb=59c7ee1cafaf53814838794908dd84f8101334c7;hpb=2652653c3db161442d28709d79c3f2d81ab571ee

diff --git a/src/df.c b/src/df.c
index 5391f50c..41a03cbf 100644
--- a/src/df.c
+++ b/src/df.c
@@ -245,7 +245,24 @@ 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)