20060303a

1 files changed, 47 insertions, 0 deletions

diff --git a/libnandfs/writeblock.c b/libnandfs/writeblock.c
new file mode 100644
index 00000000..0e4b9c3d
--- /dev/null
+++ b/libnandfs/writeblock.c
@@ -0,0 +1,47 @@
+#include "lib9.h"
+#include "logfs.h"
+#include "nandfs.h"
+#include "local.h"
+
+char *
+nandfswriteblock(Nandfs *nandfs, void *buf, uchar tag, ulong path, int xcount, long *data, long block)
+{
+	int p;
+	char *errmsg;
+
+	ulong opath = nandfsgetpath(nandfs, block);
+	ulong writepath = (~opath | path) & NandfsPathMask;
+	uchar writetag = ~nandfsgettag(nandfs, block) | tag;
+	int ppb = 1 << nandfs->ll.l2pagesperblock;
+
+	for (p = 0; p < ppb; p++) {
+		ulong wp;
+		if (p > 0 && p <= 2 + xcount) {
+			switch (p) {
+			case 1:
+				wp = (~opath | nandfsgetbaseblock(nandfs)) & NandfsPathMask;
+				break;
+			case 2:
+				wp = (~opath | nandfs->ll.blocks) & NandfsPathMask;
+				break;
+			default:
+				wp = (~opath | data[p - 3]) & NandfsPathMask;
+				break;
+			}
+		}
+		else
+			wp = writepath;
+		errmsg = nandfsupdatepage(nandfs, buf, wp, writetag, block, p);
+		if (errmsg)
+			return errmsg;
+#ifdef LOGFSTEST
+		if (logfstest.partialupdate && p > 0) {
+			print("skipping pageupdate\n");
+			break;
+		}
+#endif
+		buf = (uchar *)buf + NandfsPageSize;
+	}
+
+	return nil;
+}