From: Chas Williams <chas@cmf.nrl.navy.mil>
Date: Tue, 6 Aug 2002 20:49:00 +0000 (+0000)
Subject: Clean up the prefetch code for Linux, by calling afs_PrefetchChunk
X-Git-Tag: openafs-devel_1_3_3~21
X-Git-Url: https://git.openafs.org/?p=openafs.git;a=commitdiff_plain;h=08c2c637ab0acda9b1319333d74850214dd5917d

Clean up the prefetch code for Linux, by calling afs_PrefetchChunk
directly rather than changing the ifdef's in afs_UFSRead.
---

diff --git a/src/afs/LINUX/osi_vnodeops.c b/src/afs/LINUX/osi_vnodeops.c
index ae11f4e..8e2264c 100644
--- a/src/afs/LINUX/osi_vnodeops.c
+++ b/src/afs/LINUX/osi_vnodeops.c
@@ -1352,6 +1352,7 @@ int afs_linux_readpage(struct file *fp, struct page *pp)
     struct iovec iovec;
     struct inode *ip = FILE_INODE(fp);
     int cnt = atomic_read(&pp->count);
+    struct vcache *avc = ITOAFS(ip);
 
     AFS_GLOCK();
     afs_Trace4(afs_iclSetp, CM_TRACE_READPAGE,
@@ -1372,7 +1373,7 @@ int afs_linux_readpage(struct file *fp, struct page *pp)
 
     setup_uio(&tuio, &iovec, (char*)address, offset, PAGESIZE,
 	      UIO_READ, AFS_UIOSYS);
-    code = afs_rdwr(ITOAFS(ip), &tuio, UIO_READ, 0, credp);
+    code = afs_rdwr(avc, &tuio, UIO_READ, 0, credp);
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
     unlock_kernel();
 #endif
@@ -1398,6 +1399,22 @@ int afs_linux_readpage(struct file *fp, struct page *pp)
     free_page(address);
 #endif
 
+    if (!code && AFS_CHUNKOFFSET(offset) == 0) {
+	struct dcache *tdc;
+	struct vrequest treq;
+
+	code = afs_InitReq(&treq, credp);
+	if (!code && !NBObtainWriteLock(&avc->lock, 534)) {
+	    tdc = afs_FindDCache(avc, offset);
+	    if (tdc) {
+		if (!(tdc->mflags & DFNextStarted))
+		    afs_PrefetchChunk(avc, tdc, credp, &treq);
+		afs_PutDCache(tdc);
+	    }
+	    ReleaseWriteLock(&avc->lock);
+	}
+    }
+
     crfree(credp);
     afs_Trace4(afs_iclSetp, CM_TRACE_READPAGE,
 	       ICL_TYPE_POINTER, ip,
diff --git a/src/afs/VNOPS/afs_vnop_read.c b/src/afs/VNOPS/afs_vnop_read.c
index 55d4160..142c686 100644
--- a/src/afs/VNOPS/afs_vnop_read.c
+++ b/src/afs/VNOPS/afs_vnop_read.c
@@ -330,7 +330,7 @@ tagain:
      */
     if (tdc) {
 	ReleaseReadLock(&tdc->lock);
-#if !defined(AFS_VM_RDWR_ENV) || defined(AFS_LINUX22_ENV)
+#if !defined(AFS_VM_RDWR_ENV)
 	/* try to queue prefetch, if needed */
 	if (!noLock) {
 	    afs_PrefetchChunk(avc, tdc, acred, &treq);
@@ -559,7 +559,7 @@ afs_UFSReadFast(avc, auio, acred, albn, abpp, noLock)
 
 	    if (!noLock) {
 		ReleaseReadLock(&avc->lock);
-#if !defined(AFS_VM_RDWR_ENV) || defined(AFS_LINUX22_ENV)
+#if !defined(AFS_VM_RDWR_ENV)
 		if (!(code = afs_InitReq(&treq, acred))) {
 		    if (!(tdc->mflags & DFNextStarted))
 			afs_PrefetchChunk(avc, tdc, acred, &treq);
@@ -982,7 +982,7 @@ tagain:
      */
     if (tdc) {
 	ReleaseReadLock(&tdc->lock);
-#if !defined(AFS_VM_RDWR_ENV) || defined(AFS_LINUX22_ENV)
+#if !defined(AFS_VM_RDWR_ENV)
 	/* try to queue prefetch, if needed */
 	if (!noLock) {
 	    if (!(tdc->mflags & DFNextStarted))