/* guestfish - the filesystem interactive shell
- * Copyright (C) 2009 Red Hat Inc.
+ * Copyright (C) 2009 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
return -1;
}
+#ifdef HAVE_POSIX_FALLOCATE
if (posix_fallocate (fd, 0, size) == -1) {
perror ("fallocate");
close (fd);
unlink (argv[0]);
return -1;
}
+#else
+ /* Slow emulation of posix_fallocate on platforms which don't have it. */
+ char buffer[BUFSIZ];
+ memset (buffer, 0, sizeof buffer);
+
+ size_t remaining = size;
+ while (remaining > 0) {
+ size_t n = remaining > sizeof buffer ? sizeof buffer : remaining;
+ ssize_t r = write (fd, buffer, n);
+ if (r == -1) {
+ perror ("write");
+ close (fd);
+ unlink (argv[0]);
+ return -1;
+ }
+ remaining -= r;
+ }
+#endif
+
+ if (close (fd) == -1) {
+ perror (argv[0]);
+ unlink (argv[0]);
+ return -1;
+ }
+
+ if (guestfs_add_drive (g, argv[0]) == -1) {
+ unlink (argv[0]);
+ return -1;
+ }
+
+ return 0;
+}
+
+int
+do_sparse (const char *cmd, int argc, char *argv[])
+{
+ off_t size;
+ int fd;
+ char c = 0;
+
+ if (argc != 2) {
+ fprintf (stderr, _("use 'sparse file size' to create a sparse image\n"));
+ return -1;
+ }
+
+ if (parse_size (argv[1], &size) == -1)
+ return -1;
+
+ if (!guestfs_is_config (g)) {
+ fprintf (stderr, _("can't allocate or add disks after launching\n"));
+ return -1;
+ }
+
+ fd = open (argv[0], O_WRONLY|O_CREAT|O_NOCTTY|O_TRUNC, 0666);
+ if (fd == -1) {
+ perror (argv[0]);
+ return -1;
+ }
+
+ if (lseek (fd, size-1, SEEK_SET) == (off_t) -1) {
+ perror ("lseek");
+ close (fd);
+ unlink (argv[0]);
+ return -1;
+ }
+
+ if (write (fd, &c, 1) != 1) {
+ perror ("write");
+ close (fd);
+ unlink (argv[0]);
+ return -1;
+ }
if (close (fd) == -1) {
perror (argv[0]);
*/
if (sscanf (str, "%"SCNu64"%c", &size, &type) == 2) {
switch (type) {
- case 'k': case 'K': size *= 1024; break;
- case 'm': case 'M': size *= 1024 * 1024; break;
- case 'g': case 'G': size *= 1024 * 1024 * 1024; break;
+ case 'k': case 'K': size *= 1024ULL; break;
+ case 'm': case 'M': size *= 1024ULL * 1024ULL; break;
+ case 'g': case 'G': size *= 1024ULL * 1024ULL * 1024ULL; break;
+ case 't': case 'T': size *= 1024ULL * 1024ULL * 1024ULL * 1024ULL; break;
+ case 'p': case 'P': size *= 1024ULL * 1024ULL * 1024ULL * 1024ULL * 1024ULL; break;
+ case 'e': case 'E': size *= 1024ULL * 1024ULL * 1024ULL * 1024ULL * 1024ULL * 1024ULL; break;
case 's': size *= 512; break;
default:
fprintf (stderr, _("could not parse size specification '%s'\n"), str);
}
}
else if (sscanf (str, "%"SCNu64, &size) == 1)
- size *= 1024;
+ size *= 1024ULL;
else {
fprintf (stderr, _("could not parse size specification '%s'\n"), str);
return -1;