Import sources from 2011-03-30 iso image

1 files changed, 65 insertions, 0 deletions

diff --git a/sys/src/cmd/dossrv/devio.c b/sys/src/cmd/dossrv/devio.c
new file mode 100755
index 000000000..0ec1681ef
--- /dev/null
+++ b/sys/src/cmd/dossrv/devio.c
@@ -0,0 +1,65 @@
+#include <u.h>
+#include <libc.h>
+#include "iotrack.h"
+#include "dat.h"
+#include "fns.h"
+
+int readonly;
+
+static int
+deverror(char *name, Xfs *xf, long addr, long n, long nret)
+{
+	errno = Eio;
+	if(nret < 0){
+		chat("%s errstr=\"%r\"...", name);
+		close(xf->dev);
+		xf->dev = -1;
+		return -1;
+	}
+	fprint(2, "dev %d sector %ld, %s: %ld, should be %ld\n", xf->dev, addr, name, nret, n);
+	return -1;
+}
+
+int
+devread(Xfs *xf, long addr, void *buf, long n)
+{
+	long nread;
+
+	if(xf->dev < 0)
+		return -1;
+	nread = pread(xf->dev, buf, n, xf->offset+(vlong)addr*Sectorsize);
+	if (nread == n)
+		return 0;
+	return deverror("read", xf, addr, n, nread);
+}
+
+int
+devwrite(Xfs *xf, long addr, void *buf, long n)
+{
+	long nwrite;
+
+	if(xf->omode==OREAD)
+		return -1;
+
+	if(xf->dev < 0)
+		return -1;
+	nwrite = pwrite(xf->dev, buf, n, xf->offset+(vlong)addr*Sectorsize);
+	if (nwrite == n)
+		return 0;
+	return deverror("write", xf, addr, n, nwrite);
+}
+
+int
+devcheck(Xfs *xf)
+{
+	char buf[Sectorsize];
+
+	if(xf->dev < 0)
+		return -1;
+	if(pread(xf->dev, buf, Sectorsize, 0) != Sectorsize){
+		close(xf->dev);
+		xf->dev = -1;
+		return -1;
+	}
+	return 0;
+}