large-cache-fix-20050815

[openafs.git] / src / afs / afs.h

diff --git a/src/afs/afs.h b/src/afs/afs.h
index 9fd1814..85e0186 100644 (file)
--- a/src/afs/afs.h
+++ b/src/afs/afs.h
@@ -1116,11 +1116,15 @@ extern struct brequest afs_brs[NBRS];   /* request structures */
 #define CM_CACHESIZEDRAINEDPCT 95      /* wakeup processes when down to here. */
 #define CM_WAITFORDRAINPCT     98      /* sleep if cache is this full. */
 
+/* when afs_cacheBlocks is large, settle for slightly decreased precision */
+#define PERCENT(p, v) \
+    ((afs_cacheBlocks & 0xffe00000) ? ((v) / 100 * (p)) : ((p) * (v) / 100))
+
 #define afs_CacheIsTooFull() \
     (afs_blocksUsed - afs_blocksDiscarded > \
-       (CM_DCACHECOUNTFREEPCT*afs_cacheBlocks)/100 || \
+       PERCENT(CM_DCACHECOUNTFREEPCT, afs_cacheBlocks) || \
      afs_freeDCCount - afs_discardDCCount < \
-       ((100-CM_DCACHECOUNTFREEPCT)*afs_cacheFiles)/100)
+       PERCENT(100 - CM_DCACHECOUNTFREEPCT, afs_cacheFiles))
 
 /* Handy max length of a numeric string. */
 #define        CVBS    12              /* max afs_int32 is 2^32 ~ 4*10^9, +1 for NULL, +luck */