From 20687eecd09cdcf46274979d744de8708e6567b3 Mon Sep 17 00:00:00 2001
From: Jeffrey Altman <jaltman@secure-endpoints.com>
Date: Sun, 26 Jul 2009 13:03:49 -0400
Subject: [PATCH] Windows: Add buf_FindAll() and buf_FindAllLocked()

Add two new buffer search functions buf_FindAll and buf_FindAllLocked.
Similar to buf_Find and buf_FindLocked except they search the all buffer
list.

LICENSE MIT

Reviewed-on: http://gerrit.openafs.org/225
Tested-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
---
 src/WINNT/afsd/cm_buf.c | 48 +++++++++++++++++++++++++++++++++++++++++
 src/WINNT/afsd/cm_buf.h |  4 ++++
 2 files changed, 52 insertions(+)

diff --git a/src/WINNT/afsd/cm_buf.c b/src/WINNT/afsd/cm_buf.c
index 918dd98a9..5b37eed10 100644
--- a/src/WINNT/afsd/cm_buf.c
+++ b/src/WINNT/afsd/cm_buf.c
@@ -684,6 +684,54 @@ cm_buf_t *buf_Find(struct cm_scache *scp, osi_hyper_t *offsetp)
     return bp;
 }       
 
+/* find a buffer, if any, for a particular file ID and offset.  Assumes
+ * that buf_globalLock is write locked when called.  Uses the all buffer
+ * list.
+ */
+cm_buf_t *buf_FindAllLocked(struct cm_scache *scp, osi_hyper_t *offsetp, afs_uint32 flags)
+{
+    cm_buf_t *bp;
+
+    if (flags == 0) {
+        for(bp = cm_data.buf_allp; bp; bp=bp->allp) {
+            if (cm_FidCmp(&scp->fid, &bp->fid) == 0
+                 && offsetp->LowPart == bp->offset.LowPart
+                 && offsetp->HighPart == bp->offset.HighPart) {
+                buf_HoldLocked(bp);
+                break;
+            }
+        }
+    } else {
+        for(bp = cm_data.buf_allp; bp; bp=bp->allp) {
+            if (cm_FidCmp(&scp->fid, &bp->fid) == 0) {
+                char * fileOffset;
+                
+                fileOffset = offsetp->QuadPart + cm_data.baseAddress;
+                if (fileOffset == bp->datap) {
+                    buf_HoldLocked(bp);
+                    break;
+                }
+            }
+        }
+    }
+    /* return whatever we found, if anything */
+    return bp;
+}
+
+/* find a buffer with offset *offsetp for vnode *scp.  Called
+ * with no locks held.  Use the all buffer list.
+ */
+cm_buf_t *buf_FindAll(struct cm_scache *scp, osi_hyper_t *offsetp, afs_uint32 flags)
+{
+    cm_buf_t *bp;
+
+    lock_ObtainRead(&buf_globalLock);
+    bp = buf_FindAllLocked(scp, offsetp, flags);
+    lock_ReleaseRead(&buf_globalLock);
+
+    return bp;
+}       
+
 /* start cleaning I/O on this buffer.  Buffer must be write locked, and is returned
  * write-locked.
  *
diff --git a/src/WINNT/afsd/cm_buf.h b/src/WINNT/afsd/cm_buf.h
index f8f300f58..886ec36fa 100644
--- a/src/WINNT/afsd/cm_buf.h
+++ b/src/WINNT/afsd/cm_buf.h
@@ -154,6 +154,10 @@ extern cm_buf_t *buf_FindLocked(struct cm_scache *, osi_hyper_t *);
 
 extern cm_buf_t *buf_Find(struct cm_scache *, osi_hyper_t *);
 
+extern cm_buf_t *buf_FindAllLocked(struct cm_scache *, osi_hyper_t *, afs_uint32 flags);
+ 
+extern cm_buf_t *buf_FindAll(struct cm_scache *, osi_hyper_t *, afs_uint32 flags);
+ 
 extern long buf_GetNewLocked(struct cm_scache *, osi_hyper_t *, cm_req_t *, cm_buf_t **);
 
 extern long buf_Get(struct cm_scache *, osi_hyper_t *, cm_req_t *, cm_buf_t **);
-- 
2.39.5