diff options
Diffstat (limited to 'sys-utils/losetup.c')
| -rw-r--r-- | sys-utils/losetup.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/sys-utils/losetup.c b/sys-utils/losetup.c index a68b22229..68f777798 100644 --- a/sys-utils/losetup.c +++ b/sys-utils/losetup.c @@ -35,6 +35,7 @@ enum { A_SHOW_ONE, /* print info about one device */ A_FIND_FREE, /* find first unused */ A_SET_CAPACITY, /* set device capacity */ + A_SET_DIRECT_IO, /* set accessing backing file by direct io */ }; enum { @@ -393,6 +394,7 @@ static void usage(FILE *out) fputs(_(" --sizelimit <num> device is limited to <num> bytes of the file\n"), out); fputs(_(" -P, --partscan create a partitioned loop device\n"), out); fputs(_(" -r, --read-only set up a read-only loop device\n"), out); + fputs(_(" --direct-io open backing file with O_DIRECT\n"), out); fputs(_(" --show print device name after setup (with -f)\n"), out); fputs(_(" -v, --verbose verbose mode\n"), out); @@ -446,11 +448,13 @@ int main(int argc, char **argv) int res = 0, showdev = 0, lo_flags = 0; char *outarg = NULL; int list = 0; + unsigned long use_dio = 0, set_dio = 0; enum { OPT_SIZELIMIT = CHAR_MAX + 1, OPT_SHOW, - OPT_RAW + OPT_RAW, + OPT_DIO }; static const struct option longopts[] = { { "all", 0, 0, 'a' }, @@ -468,6 +472,7 @@ int main(int argc, char **argv) { "sizelimit", 1, 0, OPT_SIZELIMIT }, { "partscan", 0, 0, 'P' }, { "read-only", 0, 0, 'r' }, + { "direct-io", 1, 0, OPT_DIO }, { "raw", 0, 0, OPT_RAW }, { "show", 0, 0, OPT_SHOW }, { "verbose", 0, 0, 'v' }, @@ -557,6 +562,10 @@ int main(int argc, char **argv) case OPT_SHOW: showdev = 1; break; + case OPT_DIO: + set_dio = 1; + use_dio = strtoul_or_err(optarg, _("failed to parse dio")); + break; case 'v': break; case 'V': @@ -609,8 +618,13 @@ int main(int argc, char **argv) if (!act && optind + 1 == argc) { /* * losetup [--list] <device> + * OR + * losetup --direct-io DIO <device> */ - act = A_SHOW_ONE; + if (!set_dio) + act = A_SHOW_ONE; + else + act = A_SET_DIRECT_IO; if (!is_loopdev(argv[optind]) || loopcxt_set_device(&lc, argv[optind])) err(EXIT_FAILURE, _("%s: failed to use device"), @@ -695,6 +709,8 @@ int main(int argc, char **argv) if (showdev) printf("%s\n", loopcxt_get_device(&lc)); warn_size(file, sizelimit); + if (set_dio) + goto lo_set_dio; } break; } @@ -747,6 +763,13 @@ int main(int argc, char **argv) warn(_("%s: set capacity failed"), loopcxt_get_device(&lc)); break; + case A_SET_DIRECT_IO: + lo_set_dio: + res = loopcxt_set_dio(&lc, use_dio); + if (res) + warn(_("%s: set direct io failed"), + loopcxt_get_device(&lc)); + break; default: usage(stderr); break; |