Add to gpart(8) an ability to backup partition table and
restore it from given backup. Discussed with: geom@ Approved by: kib (mentor) MFC after: 1 week
This commit is contained in:
Andrey V. Elsukov
parent
a48551fac2
commit
9fe175f914
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=215570
@ -31,6 +31,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/vtoc.h>
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#include <assert.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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@ -85,6 +86,8 @@ static int gpart_show_hasopt(struct gctl_req *, const char *, const char *);
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static void gpart_write_partcode(struct ggeom *, int, void *, ssize_t);
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static void gpart_write_partcode_vtoc8(struct ggeom *, int, void *);
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static void gpart_print_error(const char *);
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static void gpart_backup(struct gctl_req *, unsigned int);
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static void gpart_restore(struct gctl_req *, unsigned int);
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struct g_command PUBSYM(class_commands)[] = {
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{ "add", 0, gpart_issue, {
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@ -97,6 +100,11 @@ struct g_command PUBSYM(class_commands)[] = {
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G_OPT_SENTINEL },
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"[-b start] [-s size] -t type [-i index] [-l label] [-f flags] geom"
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},
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{ "backup", 0, gpart_backup, {
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{ 'l', "backup_labels", NULL, G_TYPE_BOOL},
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G_OPT_SENTINEL },
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"[-l] geom"
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},
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{ "bootcode", 0, gpart_bootcode, {
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{ 'b', GPART_PARAM_BOOTCODE, G_VAL_OPTIONAL, G_TYPE_STRING },
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{ 'p', GPART_PARAM_PARTCODE, G_VAL_OPTIONAL, G_TYPE_STRING },
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@ -165,6 +173,12 @@ struct g_command PUBSYM(class_commands)[] = {
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G_OPT_SENTINEL },
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"[-s size] -i index [-f flags] geom"
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},
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{ "restore", 0, gpart_restore, {
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{ 'F', "force", NULL, G_TYPE_BOOL },
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{ 'f', "flags", GPART_FLAGS, G_TYPE_STRING },
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G_OPT_SENTINEL },
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"[-F] [-f flags] provider [...]"
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},
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{ "recover", 0, gpart_issue, {
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{ 'f', "flags", GPART_FLAGS, G_TYPE_STRING },
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G_OPT_SENTINEL },
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@ -654,6 +668,295 @@ gpart_show(struct gctl_req *req, unsigned int fl __unused)
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geom_deletetree(&mesh);
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}
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static void
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gpart_backup(struct gctl_req *req, unsigned int fl __unused)
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{
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struct gmesh mesh;
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struct gclass *classp;
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struct gprovider *pp;
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struct ggeom *gp;
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const char *s, *scheme;
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off_t sector, end;
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off_t length, secsz;
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int error, labels, i, windex, wblocks, wtype;
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if (gctl_get_int(req, "nargs") != 1)
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errx(EXIT_FAILURE, "Invalid number of arguments.");
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error = geom_gettree(&mesh);
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if (error != 0)
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errc(EXIT_FAILURE, error, "Cannot get GEOM tree");
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s = gctl_get_ascii(req, "class");
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if (s == NULL)
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abort();
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classp = find_class(&mesh, s);
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if (classp == NULL) {
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geom_deletetree(&mesh);
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errx(EXIT_FAILURE, "Class %s not found.", s);
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}
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s = gctl_get_ascii(req, "arg0");
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if (s == NULL)
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abort();
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labels = gctl_get_int(req, "backup_labels");
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gp = find_geom(classp, s);
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if (gp == NULL)
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errx(EXIT_FAILURE, "No such geom: %s.", s);
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scheme = find_geomcfg(gp, "scheme");
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if (scheme == NULL)
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abort();
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pp = LIST_FIRST(&gp->lg_consumer)->lg_provider;
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secsz = pp->lg_sectorsize;
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s = find_geomcfg(gp, "last");
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wblocks = strlen(s);
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wtype = 0;
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LIST_FOREACH(pp, &gp->lg_provider, lg_provider) {
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s = find_provcfg(pp, "type");
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i = strlen(s);
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if (i > wtype)
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wtype = i;
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}
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s = find_geomcfg(gp, "entries");
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windex = strlen(s);
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printf("%s %s\n", scheme, s);
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LIST_FOREACH(pp, &gp->lg_provider, lg_provider) {
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s = find_provcfg(pp, "start");
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if (s == NULL) {
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s = find_provcfg(pp, "offset");
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sector = (off_t)strtoimax(s, NULL, 0) / secsz;
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} else
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sector = (off_t)strtoimax(s, NULL, 0);
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s = find_provcfg(pp, "end");
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if (s == NULL) {
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s = find_provcfg(pp, "length");
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length = (off_t)strtoimax(s, NULL, 0) / secsz;
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} else {
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end = (off_t)strtoimax(s, NULL, 0);
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length = end - sector + 1;
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}
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s = find_provcfg(pp, "label");
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printf("%-*s %*s %*jd %*jd",
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windex, find_provcfg(pp, "index"),
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wtype, find_provcfg(pp, "type"),
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wblocks, (intmax_t)sector,
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wblocks, (intmax_t)length);
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if (labels && s != NULL)
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printf(" %s", s);
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printf(" %s\n", fmtattrib(pp));
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}
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geom_deletetree(&mesh);
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}
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static int
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skip_line(const char *p)
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{
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while (*p != '\0') {
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if (*p == '#')
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return (1);
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if (isspace(*p) == 0)
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return (0);
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p++;
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}
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return (1);
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}
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static void
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gpart_restore(struct gctl_req *req, unsigned int fl __unused)
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{
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struct gmesh mesh;
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struct gclass *classp;
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struct gctl_req *r;
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struct ggeom *gp;
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const char *s, *flags, *errstr, *label;
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char **ap, *argv[6], line[BUFSIZ], *pline;
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int error, forced, i, l, nargs, created;
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intmax_t n;
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nargs = gctl_get_int(req, "nargs");
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if (nargs < 1)
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errx(EXIT_FAILURE, "Invalid number of arguments.");
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forced = gctl_get_int(req, "force");
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flags = gctl_get_ascii(req, "flags");
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s = gctl_get_ascii(req, "class");
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if (s == NULL)
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abort();
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error = geom_gettree(&mesh);
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if (error != 0)
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errc(EXIT_FAILURE, error, "Cannot get GEOM tree");
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classp = find_class(&mesh, s);
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if (classp == NULL) {
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geom_deletetree(&mesh);
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errx(EXIT_FAILURE, "Class %s not found.", s);
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}
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if (forced) {
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/* destroy existent partition table before restore */
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for (i = 0; i < nargs; i++) {
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s = gctl_get_ascii(req, "arg%d", i);
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gp = find_geom(classp, s);
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if (gp != NULL) {
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r = gctl_get_handle();
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gctl_ro_param(r, "class", -1,
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classp->lg_name);
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gctl_ro_param(r, "verb", -1, "destroy");
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gctl_ro_param(r, "flags", -1, "restore");
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gctl_ro_param(r, "force", sizeof(forced),
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&forced);
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gctl_ro_param(r, "arg0", -1, s);
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errstr = gctl_issue(r);
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if (errstr != NULL && errstr[0] != '\0') {
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gpart_print_error(errstr);
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gctl_free(r);
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goto backout;
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}
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gctl_free(r);
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}
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}
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}
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created = 0;
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while (fgets(line, sizeof(line) - 1, stdin)) {
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/* Format of backup entries:
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* <scheme name> <number of entries>
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* <index> <type> <start> <size> [label] ['['attrib[,attrib]']']
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*/
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pline = (char *)line;
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pline[strlen(line) - 1] = 0;
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if (skip_line(pline))
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continue;
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for (ap = argv;
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(*ap = strsep(&pline, " \t")) != NULL;)
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if (**ap != '\0' && ++ap >= &argv[6])
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break;
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l = ap - &argv[0];
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label = pline = NULL;
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if (l == 2) { /* create table */
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if (created)
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errx(EXIT_FAILURE, "Incorrect backup format.");
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n = atoi(argv[1]);
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for (i = 0; i < nargs; i++) {
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s = gctl_get_ascii(req, "arg%d", i);
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r = gctl_get_handle();
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n = strtoimax(argv[1], NULL, 0);
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gctl_ro_param(r, "class", -1,
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classp->lg_name);
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gctl_ro_param(r, "verb", -1, "create");
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gctl_ro_param(r, "scheme", -1, argv[0]);
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gctl_ro_param(r, "entries", sizeof(n), &n);
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gctl_ro_param(r, "flags", -1, "restore");
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gctl_ro_param(r, "arg0", -1, s);
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errstr = gctl_issue(r);
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if (errstr != NULL && errstr[0] != '\0') {
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gpart_print_error(errstr);
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gctl_free(r);
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goto backout;
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}
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gctl_free(r);
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}
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created = 1;
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continue;
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} else if (l < 4 || created == 0)
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errx(EXIT_FAILURE, "Incorrect backup format.");
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else if (l == 5) {
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if (strchr(argv[4], '[') == NULL)
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label = argv[4];
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else
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pline = argv[4];
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} else if (l == 6) {
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label = argv[4];
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pline = argv[5];
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}
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/* Add partitions to each table */
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for (i = 0; i < nargs; i++) {
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s = gctl_get_ascii(req, "arg%d", i);
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r = gctl_get_handle();
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n = strtoimax(argv[0], NULL, 0);
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gctl_ro_param(r, "class", -1, classp->lg_name);
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gctl_ro_param(r, "verb", -1, "add");
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gctl_ro_param(r, "flags", -1, "restore");
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gctl_ro_param(r, GPART_PARAM_INDEX, sizeof(n), &n);
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gctl_ro_param(r, "type", -1, argv[1]);
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gctl_ro_param(r, "start", -1, argv[2]);
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gctl_ro_param(r, "size", -1, argv[3]);
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if (label != NULL)
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gctl_ro_param(r, "label", -1, argv[4]);
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gctl_ro_param(r, "arg0", -1, s);
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error = gpart_autofill(r);
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if (error != 0)
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errc(EXIT_FAILURE, error, "autofill");
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errstr = gctl_issue(r);
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if (errstr != NULL && errstr[0] != '\0') {
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gpart_print_error(errstr);
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gctl_free(r);
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goto backout;
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}
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gctl_free(r);
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}
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if (pline == NULL || *pline != '[')
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continue;
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/* set attributes */
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pline++;
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for (ap = argv;
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(*ap = strsep(&pline, ",]")) != NULL;)
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if (**ap != '\0' && ++ap >= &argv[6])
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break;
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for (i = 0; i < nargs; i++) {
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l = ap - &argv[0];
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s = gctl_get_ascii(req, "arg%d", i);
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while (l > 0) {
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r = gctl_get_handle();
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gctl_ro_param(r, "class", -1, classp->lg_name);
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gctl_ro_param(r, "verb", -1, "set");
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gctl_ro_param(r, "flags", -1, "restore");
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gctl_ro_param(r, GPART_PARAM_INDEX,
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sizeof(n), &n);
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gctl_ro_param(r, "attrib", -1, argv[--l]);
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gctl_ro_param(r, "arg0", -1, s);
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errstr = gctl_issue(r);
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if (errstr != NULL && errstr[0] != '\0') {
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gpart_print_error(errstr);
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gctl_free(r);
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goto backout;
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}
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gctl_free(r);
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}
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}
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}
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/* commit changes if needed */
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if (strchr(flags, 'C') != NULL) {
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for (i = 0; i < nargs; i++) {
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s = gctl_get_ascii(req, "arg%d", i);
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r = gctl_get_handle();
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gctl_ro_param(r, "class", -1, classp->lg_name);
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gctl_ro_param(r, "verb", -1, "commit");
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gctl_ro_param(r, "arg0", -1, s);
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errstr = gctl_issue(r);
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if (errstr != NULL && errstr[0] != '\0') {
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gpart_print_error(errstr);
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gctl_free(r);
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goto backout;
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}
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gctl_free(r);
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}
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}
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gctl_free(req);
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geom_deletetree(&mesh);
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exit(EXIT_SUCCESS);
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backout:
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for (i = 0; i < nargs; i++) {
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s = gctl_get_ascii(req, "arg%d", i);
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r = gctl_get_handle();
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gctl_ro_param(r, "class", -1, classp->lg_name);
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gctl_ro_param(r, "verb", -1, "undo");
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gctl_ro_param(r, "arg0", -1, s);
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gctl_issue(r);
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gctl_free(r);
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}
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gctl_free(req);
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geom_deletetree(&mesh);
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exit(EXIT_FAILURE);
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}
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static void *
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gpart_bootfile_read(const char *bootfile, ssize_t *size)
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{
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@ -24,7 +24,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd October 25, 2010
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.Dd November 20, 2010
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.Dt GPART 8
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.Os
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.Sh NAME
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@ -91,6 +91,11 @@ utility:
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.Op Fl l Ar label
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.Op Fl f Ar flags
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.Ar geom
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.\" ==== BACKUP ====
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.Nm
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.Cm backup
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.Op Fl l
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.Ar geom
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.\" ==== BOOTCODE ====
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.Nm
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.Cm bootcode
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@ -141,6 +146,13 @@ utility:
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.Op Fl s Ar size
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.Op Fl f Ar flags
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.Ar geom
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.\" ==== RESTORE ====
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.Nm
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.Cm restore
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.Op Fl F
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.Op Fl f Ar flags
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.Ar provider
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.Op Ar ...
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.\" ==== SET ====
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.Nm
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.Cm set
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@ -208,6 +220,17 @@ See the section entitled
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below for a discussion
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about its use.
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.El
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.\" ==== BACKUP ====
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.It Cm backup
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Dump a partition table to standard output in special format used by
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.Cm restore
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action.
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.Pp
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Additional options include:
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.Bl -tag -width 10n
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.It Fl l
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Dump partition labels for partitioning schemes that support them.
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.El
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.\" ==== BOOTCODE ====
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.It Cm bootcode
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Embed bootstrap code into the partitioning scheme's metadata on the
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@ -401,6 +424,28 @@ See the section entitled
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below for a discussion
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about its use.
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.El
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.\" ==== RESTORE ====
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.It Cm restore
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Restore the partition table from backup previously created by
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.Cm backup
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action and given from standard input. Only partition table
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may be restored. This action does not affect content of partitions.
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This mean that you should copy your data from backup after restoring
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partition table and write bootcode again if it is needed.
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.Pp
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Additional options include:
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.Bl -tag -width 10n
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.It Fl F
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Destroy partition table on the given
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.Ar provider
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before doing restore.
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.It Fl f Ar flags
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Additional operational flags.
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See the section entitled
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.Sx "OPERATIONAL FLAGS"
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below for a discussion
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about its use.
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.El
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.\" ==== SET ====
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.It Cm set
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Set the named attribute on the partition entry.
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@ -770,6 +815,28 @@ After having created all required partitions, embed bootstrap code into them.
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.Bd -literal -offset indent
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/sbin/gpart bootcode -p /boot/boot1 da0
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.Ed
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.Pp
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Create backup of partition table from
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.Pa da0
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.Bd -literal -offset indent
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/sbin/gpart backup -l da0 > da0.backup
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.Ed
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.Pp
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Restore partition table from backup to
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.Pa da0
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.Bd -literal -offset indent
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/sbin/gpart restore da0 < /mnt/da0.backup
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.Ed
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.Pp
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Clone partition table from
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.Pa ada0
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to
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.Pa ada1
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and
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.Pa ada2
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.Bd -literal -offset indent
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/sbin/gpart backup ada0 | /sbin/gpart restore -F ada1 ada2
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.Ed
|
||||
.Sh SEE ALSO
|
||||
.Xr dd 1 ,
|
||||
.Xr geom 4 ,
|
||||
|
||||
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