[PATCH][TOOLS] libxc: finish discard_file_cache() for NetBSD

[Christoph Egger <Christoph.Egger@amd.com>]

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Hi,

attached patch completes discard_file_cache() for NetBSD.

Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>

-- 
---to satisfy European Law for business letters:
Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach b. Muenchen
Geschaeftsfuehrer: Alberto Bozzo, Andrew Bowd
Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen
Registergericht Muenchen, HRB Nr. 43632

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diff -r be72873a6f30 tools/libxc/xc_netbsd.c
--- a/tools/libxc/xc_netbsd.c	Wed Dec 15 11:49:51 2010 +0100
+++ b/tools/libxc/xc_netbsd.c	Wed Dec 15 12:08:47 2010 +0100
@@ -280,11 +280,36 @@ int xc_evtchn_unmask(int xce_handle, evt
 /* Optionally flush file to disk and discard page cache */
 void discard_file_cache(xc_interface *xch, int fd, int flush) 
 {
+    off_t cur = 0;
+    int saved_errno = errno;
 
     if ( flush && (fsync(fd) < 0) )
     {
         /*PERROR("Failed to flush file: %s", strerror(errno));*/
+        goto out;
     }
+
+    /*
+     * Calculate last page boundry of amount written so far
+     * unless we are flushing in which case entire cache
+     * is discarded.
+     */
+    if ( !flush )
+    {
+        if ( ( cur = lseek(fd, 0, SEEK_CUR)) == (off_t)-1 )
+            cur = 0;
+        cur &= ~(PAGE_SIZE - 1);
+    }
+
+    /* Discard from the buffer cache. */
+    if ( posix_fadvise(fd, 0, cur, POSIX_FADV_DONTNEED) < 0 )
+    {
+        /*PERROR("Failed to discard cache: %s", strerror(errno));*/
+        goto out;
+    }
+
+ out:
+    errno = saved_errno;
 }
 
 int xc_gnttab_open(void)

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