X-Git-Url: http://git.annexia.org/?a=blobdiff_plain;f=daemon%2Ffallocate.c;h=7f17f8b85d6824dba4e9604468a682bec93ad2bc;hb=f5d52fa3c00e525cd5d86089b85f970a5c4e7c21;hp=47e84c6970b5162e51c1c82357ccf569b6331816;hpb=0e6e32025885286e2de39efca34ced2aaf26b3a3;p=libguestfs.git

diff --git a/daemon/fallocate.c b/daemon/fallocate.c
index 47e84c6..7f17f8b 100644
--- a/daemon/fallocate.c
+++ b/daemon/fallocate.c
@@ -28,27 +28,45 @@
 #include "actions.h"
 
 int
-do_fallocate (char *path, int len)
+do_fallocate (const char *path, int len)
 {
-  int fd, r;
-
-  NEED_ROOT (-1);
-  ABS_PATH (path, -1);
+  int fd;
 
   CHROOT_IN;
   fd = open (path, O_WRONLY | O_CREAT | O_TRUNC | O_NOCTTY, 0666);
   CHROOT_OUT;
   if (fd == -1) {
-    reply_with_perror (path);
+    reply_with_perror ("open: %s", path);
     return -1;
   }
 
+#ifdef HAVE_POSIX_FALLOCATE
+  int r;
+
   r = posix_fallocate (fd, 0, len);
   if (r == -1) {
-    reply_with_perror ("posix_fallocate: %s", path);
+    reply_with_perror ("%s", path);
     close (fd);
     return -1;
   }
+#else
+  ssize_t r;
+  char buf[BUFSIZ];
+  const size_t len_sz = (size_t) len;
+  size_t n;
+
+  memset (buf, 0, BUFSIZ);
+  n = 0;
+  while (n < len_sz) {
+    r = write (fd, buf, len_sz - n < BUFSIZ ? len_sz - n : BUFSIZ);
+    if (r == -1) {
+      reply_with_perror ("write: %s", path);
+      close (fd);
+      return -1;
+    }
+    n += r;
+  }
+#endif
 
   if (close (fd) == -1) {
     reply_with_perror ("close: %s", path);