STABLE14-memcache-set-default-write-size-20051002

based on comment from chas williams. set the default write amount as is
done for ufs cache writes

(cherry picked from commit 543e49eaaea2290c4239dd79864384f11adb2607)

diff --git a/src/afs/VNOPS/afs_vnop_write.c b/src/afs/VNOPS/afs_vnop_write.c
index 4a93e5572b38f36b2cd51de6ea812fc9d8ccc3af..8b18d57568cf330a2a1364e88d76cac088f70ba6 100644 (file)
--- a/src/afs/VNOPS/afs_vnop_write.c
+++ b/src/afs/VNOPS/afs_vnop_write.c
@@ -186,12 +186,13 @@ afs_MemWrite(register struct vcache *avc, struct uio *auio, int aio,
     avc->states |= CDirty;
     tvec = (struct iovec *)osi_AllocSmallSpace(sizeof(struct iovec));
     while (totalLength > 0) {
-       /* Read the cached info. If we call GetDCache while the cache
-        * truncate daemon is running we risk overflowing the disk cache.
-        * Instead we check for an existing cache slot. If we cannot
-        * find an existing slot we wait for the cache to drain
-        * before calling GetDCache.
+       /* 
+        *  The following line is necessary because afs_GetDCache with
+        *  flag == 4 expects the length field to be filled. It decides
+        *  from this whether it's necessary to fetch data into the chunk
+        *  before writing or not (when the whole chunk is overwritten!).
         */
+       len = totalLength;      /* write this amount by default */
        if (noLock) {
            tdc = afs_FindDCache(avc, filePos);
            if (tdc)