From: Derrick Brashear <shadow@dementia.org>
Date: Mon, 3 Oct 2005 03:55:33 +0000 (+0000)
Subject: STABLE14-memcache-set-default-write-size-20051002
X-Git-Tag: openafs-stable-1_4_0-rc6~4
X-Git-Url: https://git.michaelhowe.org/gitweb/?a=commitdiff_plain;h=a5d8c8dad1b8f473523d387abaa026911c0bd5c2;p=packages%2Fo%2Fopenafs.git

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 4a93e5572..8b18d5756 100644
--- 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)