2 * Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/module.h>
35 #include <sys/mutex.h>
37 #include <sys/ctype.h>
38 #include <sys/malloc.h>
39 #include <sys/libkern.h>
41 #include <sys/stddef.h>
42 #include <sys/sysctl.h>
43 #include <geom/geom.h>
44 #include <geom/geom_slice.h>
45 #include <geom/label/g_label.h>
47 FEATURE(geom_label, "GEOM labeling support");
49 SYSCTL_DECL(_kern_geom);
50 SYSCTL_NODE(_kern_geom, OID_AUTO, label, CTLFLAG_RW, 0, "GEOM_LABEL stuff");
51 u_int g_label_debug = 0;
52 TUNABLE_INT("kern.geom.label.debug", &g_label_debug);
53 SYSCTL_UINT(_kern_geom_label, OID_AUTO, debug, CTLFLAG_RW, &g_label_debug, 0,
56 static int g_label_destroy_geom(struct gctl_req *req, struct g_class *mp,
58 static int g_label_destroy(struct g_geom *gp, boolean_t force);
59 static struct g_geom *g_label_taste(struct g_class *mp, struct g_provider *pp,
61 static void g_label_config(struct gctl_req *req, struct g_class *mp,
64 struct g_class g_label_class = {
65 .name = G_LABEL_CLASS_NAME,
67 .ctlreq = g_label_config,
68 .taste = g_label_taste,
69 .destroy_geom = g_label_destroy_geom
73 * To add a new file system where you want to look for volume labels,
75 * 1. Add a file g_label_<file system>.c which implements labels recognition.
76 * 2. Add an 'extern const struct g_label_desc g_label_<file system>;' into
78 * 3. Add an element to the table below '&g_label_<file system>,'.
79 * 4. Add your file to sys/conf/files.
80 * 5. Add your file to sys/modules/geom/geom_label/Makefile.
81 * 6. Add your file system to manual page sbin/geom/class/label/glabel.8.
83 const struct g_label_desc *g_labels[] = {
98 g_label_rtrim(char *label, size_t size)
102 for (i = size - 1; i >= 0; i--) {
103 if (label[i] == '\0')
105 else if (label[i] == ' ')
113 g_label_destroy_geom(struct gctl_req *req __unused, struct g_class *mp,
114 struct g_geom *gp __unused)
118 * XXX: Unloading a class which is using geom_slice:1.56 is currently
119 * XXX: broken, so we deny unloading when we have geoms.
125 g_label_orphan(struct g_consumer *cp)
128 G_LABEL_DEBUG(1, "Label %s removed.",
129 LIST_FIRST(&cp->geom->provider)->name);
134 g_label_spoiled(struct g_consumer *cp)
137 G_LABEL_DEBUG(1, "Label %s removed.",
138 LIST_FIRST(&cp->geom->provider)->name);
143 g_label_resize(struct g_consumer *cp)
146 G_LABEL_DEBUG(1, "Label %s resized.",
147 LIST_FIRST(&cp->geom->provider)->name);
149 g_slice_config(cp->geom, 0, G_SLICE_CONFIG_FORCE, (off_t)0,
150 cp->provider->mediasize, cp->provider->sectorsize, "notused");
154 g_label_is_name_ok(const char *label)
158 /* Check if the label starts from ../ */
159 if (strncmp(label, "../", 3) == 0)
161 /* Check if the label contains /../ */
162 if (strstr(label, "/../") != NULL)
164 /* Check if the label ends at ../ */
165 if ((s = strstr(label, "/..")) != NULL && s[3] == '\0')
171 g_label_mangle_name(char *label, size_t size)
176 sb = sbuf_new(NULL, NULL, size, SBUF_FIXEDLEN);
177 for (c = label; *c != '\0'; c++) {
178 if (!isprint(*c) || isspace(*c) || *c =='"' || *c == '%')
179 sbuf_printf(sb, "%%%02X", *c);
183 if (sbuf_finish(sb) != 0)
186 strlcpy(label, sbuf_data(sb), size);
190 static struct g_geom *
191 g_label_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp,
192 const char *label, const char *dir, off_t mediasize)
195 struct g_provider *pp2;
196 struct g_consumer *cp;
201 if (!g_label_is_name_ok(label)) {
202 G_LABEL_DEBUG(0, "%s contains suspicious label, skipping.",
204 G_LABEL_DEBUG(1, "%s suspicious label is: %s", pp->name, label);
206 gctl_error(req, "Label name %s is invalid.", label);
211 snprintf(name, sizeof(name), "%s/%s", dir, label);
212 LIST_FOREACH(gp, &mp->geom, geom) {
213 pp2 = LIST_FIRST(&gp->provider);
216 if ((pp2->flags & G_PF_ORPHAN) != 0)
218 if (strcmp(pp2->name, name) == 0) {
219 G_LABEL_DEBUG(1, "Label %s(%s) already exists (%s).",
220 label, name, pp->name);
222 gctl_error(req, "Provider %s already exists.",
228 gp = g_slice_new(mp, 1, pp, &cp, NULL, 0, NULL);
230 G_LABEL_DEBUG(0, "Cannot create slice %s.", label);
232 gctl_error(req, "Cannot create slice %s.", label);
235 gp->orphan = g_label_orphan;
236 gp->spoiled = g_label_spoiled;
237 gp->resize = g_label_resize;
238 g_access(cp, -1, 0, 0);
239 g_slice_config(gp, 0, G_SLICE_CONFIG_SET, (off_t)0, mediasize,
240 pp->sectorsize, "%s", name);
241 G_LABEL_DEBUG(1, "Label for provider %s is %s.", pp->name, name);
246 g_label_destroy(struct g_geom *gp, boolean_t force)
248 struct g_provider *pp;
251 pp = LIST_FIRST(&gp->provider);
252 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
254 G_LABEL_DEBUG(0, "Provider %s is still open, so it "
255 "can't be definitely removed.", pp->name);
258 "Provider %s is still open (r%dw%de%d).", pp->name,
259 pp->acr, pp->acw, pp->ace);
262 } else if (pp != NULL)
263 G_LABEL_DEBUG(1, "Label %s removed.", pp->name);
264 g_slice_spoiled(LIST_FIRST(&gp->consumer));
269 g_label_read_metadata(struct g_consumer *cp, struct g_label_metadata *md)
271 struct g_provider *pp;
279 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
284 /* Decode metadata. */
285 label_metadata_decode(buf, md);
292 g_label_orphan_taste(struct g_consumer *cp __unused)
295 KASSERT(1 == 0, ("%s called?", __func__));
299 g_label_start_taste(struct bio *bp __unused)
302 KASSERT(1 == 0, ("%s called?", __func__));
306 g_label_access_taste(struct g_provider *pp __unused, int dr __unused,
307 int dw __unused, int de __unused)
310 KASSERT(1 == 0, ("%s called", __func__));
314 static struct g_geom *
315 g_label_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
317 struct g_label_metadata md;
318 struct g_consumer *cp;
322 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
325 G_LABEL_DEBUG(2, "Tasting %s.", pp->name);
327 /* Skip providers that are already open for writing. */
331 if (strcmp(pp->geom->class->name, mp->name) == 0)
334 gp = g_new_geomf(mp, "label:taste");
335 gp->start = g_label_start_taste;
336 gp->access = g_label_access_taste;
337 gp->orphan = g_label_orphan_taste;
338 cp = g_new_consumer(gp);
340 if (g_access(cp, 1, 0, 0) != 0)
343 if (g_label_read_metadata(cp, &md) != 0)
345 if (strcmp(md.md_magic, G_LABEL_MAGIC) != 0)
347 if (md.md_version > G_LABEL_VERSION) {
348 printf("geom_label.ko module is too old to handle %s.\n",
354 * Backward compatibility:
357 * There was no md_provsize field in earlier versions of
360 if (md.md_version < 2)
361 md.md_provsize = pp->mediasize;
363 if (md.md_provsize != pp->mediasize)
366 g_label_create(NULL, mp, pp, md.md_label, G_LABEL_DIR,
367 pp->mediasize - pp->sectorsize);
369 for (i = 0; g_labels[i] != NULL; i++) {
372 if (g_labels[i]->ld_enabled == 0)
375 g_labels[i]->ld_taste(cp, label, sizeof(label));
376 g_label_mangle_name(label, sizeof(label));
378 if (label[0] == '\0')
380 g_label_create(NULL, mp, pp, label, g_labels[i]->ld_dir,
383 g_access(cp, -1, 0, 0);
386 g_destroy_consumer(cp);
392 g_label_ctl_create(struct gctl_req *req, struct g_class *mp)
394 struct g_provider *pp;
400 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
402 gctl_error(req, "No '%s' argument", "nargs");
406 gctl_error(req, "Invalid number of arguments.");
410 * arg1 is the name of provider.
412 name = gctl_get_asciiparam(req, "arg1");
414 gctl_error(req, "No 'arg%d' argument", 1);
417 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
418 name += strlen("/dev/");
419 pp = g_provider_by_name(name);
421 G_LABEL_DEBUG(1, "Provider %s is invalid.", name);
422 gctl_error(req, "Provider %s is invalid.", name);
428 name = gctl_get_asciiparam(req, "arg0");
430 gctl_error(req, "No 'arg%d' argument", 0);
433 g_label_create(req, mp, pp, name, G_LABEL_DIR, pp->mediasize);
437 g_label_skip_dir(const char *name)
442 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
443 name += strlen("/dev/");
444 if (strncmp(name, G_LABEL_DIR "/", strlen(G_LABEL_DIR "/")) == 0)
445 name += strlen(G_LABEL_DIR "/");
446 for (i = 0; g_labels[i] != NULL; i++) {
447 snprintf(path, sizeof(path), "%s/", g_labels[i]->ld_dir);
448 if (strncmp(name, path, strlen(path)) == 0) {
449 name += strlen(path);
456 static struct g_geom *
457 g_label_find_geom(struct g_class *mp, const char *name)
460 struct g_provider *pp;
463 name = g_label_skip_dir(name);
464 LIST_FOREACH(gp, &mp->geom, geom) {
465 pp = LIST_FIRST(&gp->provider);
466 pname = g_label_skip_dir(pp->name);
467 if (strcmp(pname, name) == 0)
474 g_label_ctl_destroy(struct gctl_req *req, struct g_class *mp)
476 int *nargs, *force, error, i;
483 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
485 gctl_error(req, "No '%s' argument", "nargs");
489 gctl_error(req, "Missing device(s).");
492 force = gctl_get_paraml(req, "force", sizeof(*force));
494 gctl_error(req, "No 'force' argument");
498 for (i = 0; i < *nargs; i++) {
499 snprintf(param, sizeof(param), "arg%d", i);
500 name = gctl_get_asciiparam(req, param);
502 gctl_error(req, "No 'arg%d' argument", i);
505 gp = g_label_find_geom(mp, name);
507 G_LABEL_DEBUG(1, "Label %s is invalid.", name);
508 gctl_error(req, "Label %s is invalid.", name);
511 error = g_label_destroy(gp, *force);
513 gctl_error(req, "Cannot destroy label %s (error=%d).",
514 LIST_FIRST(&gp->provider)->name, error);
521 g_label_config(struct gctl_req *req, struct g_class *mp, const char *verb)
527 version = gctl_get_paraml(req, "version", sizeof(*version));
528 if (version == NULL) {
529 gctl_error(req, "No '%s' argument.", "version");
532 if (*version != G_LABEL_VERSION) {
533 gctl_error(req, "Userland and kernel parts are out of sync.");
537 if (strcmp(verb, "create") == 0) {
538 g_label_ctl_create(req, mp);
540 } else if (strcmp(verb, "destroy") == 0 ||
541 strcmp(verb, "stop") == 0) {
542 g_label_ctl_destroy(req, mp);
546 gctl_error(req, "Unknown verb.");
549 DECLARE_GEOM_CLASS(g_label_class, g_label);