X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=net%2Fcore%2Fiovec.c;h=b77eeecc00115eefd2395648e71cb337ee53757a;hb=ea23192e8e577dfc51e0f4fc5ca113af334edff9;hp=de178e462682af6c97dbfc4326df85942ec25174;hpb=e3a0dd98e1ddfd135b7ef889fcc0269e8c2ca445;p=~andy%2Flinux

diff --git a/net/core/iovec.c b/net/core/iovec.c
index de178e46268..b77eeecc001 100644
--- a/net/core/iovec.c
+++ b/net/core/iovec.c
@@ -212,3 +212,27 @@ out_fault:
 	goto out;
 }
 EXPORT_SYMBOL(csum_partial_copy_fromiovecend);
+
+unsigned long iov_pages(const struct iovec *iov, int offset,
+			unsigned long nr_segs)
+{
+	unsigned long seg, base;
+	int pages = 0, len, size;
+
+	while (nr_segs && (offset >= iov->iov_len)) {
+		offset -= iov->iov_len;
+		++iov;
+		--nr_segs;
+	}
+
+	for (seg = 0; seg < nr_segs; seg++) {
+		base = (unsigned long)iov[seg].iov_base + offset;
+		len = iov[seg].iov_len - offset;
+		size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT;
+		pages += size;
+		offset = 0;
+	}
+
+	return pages;
+}
+EXPORT_SYMBOL(iov_pages);