From: Frank Lahm <franklahm@googlemail.com>
Date: Fri, 15 Mar 2013 08:19:40 +0000 (+0100)
Subject: Use FreeBSD sendfile() capability to send protocol header
X-Git-Url: https://arthur.barton.de/gitweb/?p=netatalk.git;a=commitdiff_plain;h=fa5fcf44a4a5498a3083a24985c98ffb42fbce9c

Use FreeBSD sendfile() capability to send protocol header

When transmitting file contents to a client with sendfile(), on
every platform other then Solaris (where we use sendfilev()), we
send the AFP the protocol header with an additional send with
MSG_MORE before calling sendfile().
FreeBSD sendfile() supports sending protocol header (and trailer)
data similarly to Solaris sendfilev().
---

diff --git a/NEWS b/NEWS
index 5456a411..3fe240b2 100644
--- a/NEWS
+++ b/NEWS
@@ -35,6 +35,8 @@ Changes in 3.0.3
 * FIX: Permissions of ._ AppleDouble ressource fork after conversion
        from v2 to ea.
        Fixes bug #505.
+* UPD: Use FreeBSD sendfile() capability to send protocol header.
+       From FR #75.
 
 Changes in 3.0.2
 ================
diff --git a/etc/afpd/fork.c b/etc/afpd/fork.c
index 7f5487ee..577cd471 100644
--- a/etc/afpd/fork.c
+++ b/etc/afpd/fork.c
@@ -798,7 +798,7 @@ static int read_fork(AFPObj *obj, char *ibuf, size_t ibuflen _U_, char *rbuf, si
         "afp_read(fork: %" PRIu16 " [%s], off: %" PRIu64 ", len: %" PRIu64 ", size: %" PRIu64 ")",
         ofork->of_refnum, (ofork->of_flags & AFPFORK_DATA) ? "data" : "reso", offset, reqcount, size);
 
-    if (offset > size) {
+    if (offset >= size) {
         err = AFPERR_EOF;
         goto afp_read_err;
     }
diff --git a/libatalk/dsi/dsi_stream.c b/libatalk/dsi/dsi_stream.c
index da58f87c..7579e252 100644
--- a/libatalk/dsi/dsi_stream.c
+++ b/libatalk/dsi/dsi_stream.c
@@ -344,6 +344,16 @@ ssize_t dsi_stream_read_file(DSI *dsi, const int fromfd, off_t offset, const siz
     int sfvcnt;
     struct sendfilevec vec[2];
     ssize_t nwritten;
+#elif defined(FREEBSD)
+    ssize_t nwritten;
+    void *hdrp;
+    struct sf_hdtr hdr;
+    struct iovec iovec;
+    hdr.headers = &iovec;
+    hdr.hdr_cnt = 1;
+    hdr.trailers = NULL;
+    hdr.trl_cnt = 0;
+    hdrp = &hdr;
 #endif
 
     LOG(log_maxdebug, logtype_dsi, "dsi_stream_read_file(off: %jd, len: %zu)", (intmax_t)offset, length);
@@ -372,6 +382,9 @@ ssize_t dsi_stream_read_file(DSI *dsi, const int fromfd, off_t offset, const siz
     vec[1].sfv_flag = 0;
     vec[1].sfv_off = offset;
     vec[1].sfv_len = length;
+#elif defined(FREEBSD)
+    iovec.iov_base = block;
+    iovec.iov_len = DSI_BLOCKSIZ;
 #else
     dsi_stream_write(dsi, block, sizeof(block), DSI_MSG_MORE);
 #endif
@@ -380,6 +393,10 @@ ssize_t dsi_stream_read_file(DSI *dsi, const int fromfd, off_t offset, const siz
 #ifdef HAVE_SENDFILEV
         nwritten = 0;
         len = sendfilev(dsi->socket, vec, sfvcnt, &nwritten);
+#elif defined(FREEBSD)
+        len = sendfile(fromfd, dsi->socket, pos, total - written, hdrp, &nwritten, 0);
+        if (len == 0)
+            len = nwritten;
 #else
         len = sys_sendfile(dsi->socket, fromfd, &pos, total - written);
 #endif
@@ -388,16 +405,14 @@ ssize_t dsi_stream_read_file(DSI *dsi, const int fromfd, off_t offset, const siz
             case EINTR:
             case EAGAIN:
                 len = 0;
-#ifdef HAVE_SENDFILEV
+#if defined(HAVE_SENDFILEV) || defined(FREEBSD)
                 len = (size_t)nwritten;
-#else
-#if defined(SOLARIS) || defined(FREEBSD)
+#elif defined(SOLARIS)
                 if (pos > offset) {
                     /* we actually have sent sth., adjust counters and keep trying */
                     len = pos - offset;
                     offset = pos;
                 }
-#endif /* defined(SOLARIS) || defined(FREEBSD) */
 #endif /* HAVE_SENDFILEV */
 
                 if (dsi_peek(dsi) != 0) {
@@ -426,6 +441,18 @@ ssize_t dsi_stream_read_file(DSI *dsi, const int fromfd, off_t offset, const siz
             vec[0].sfv_off += len;
             vec[0].sfv_len -= len;
         }
+#elif defined(FREEBSD)
+        if (hdrp) {
+            if (len >= iovec.iov_len) {
+                hdrp = NULL;
+                len -= iovec.iov_len;   /* len now contains how much sendfile() actually sent from the file */
+            } else {
+                iovec.iov_len -= len;
+                iovec.iov_base += len;
+                len = 0;
+            }
+        }
+        pos += len;
 #endif  /* HAVE_SENDFILEV */
         LOG(log_maxdebug, logtype_dsi, "dsi_stream_read_file: wrote: %zd", len);
         written += len;