2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/module.h>
39 #include <sys/mutex.h>
41 #include <sys/ctype.h>
42 #include <sys/malloc.h>
43 #include <sys/libkern.h>
45 #include <sys/stddef.h>
46 #include <sys/sysctl.h>
47 #include <geom/geom.h>
48 #include <geom/geom_dbg.h>
49 #include <geom/geom_slice.h>
50 #include <geom/label/g_label.h>
52 FEATURE(geom_label, "GEOM labeling support");
54 SYSCTL_DECL(_kern_geom);
55 SYSCTL_NODE(_kern_geom, OID_AUTO, label, CTLFLAG_RW, 0, "GEOM_LABEL stuff");
56 u_int g_label_debug = 0;
57 SYSCTL_UINT(_kern_geom_label, OID_AUTO, debug, CTLFLAG_RWTUN, &g_label_debug, 0,
60 static int g_label_destroy_geom(struct gctl_req *req, struct g_class *mp,
62 static int g_label_destroy(struct g_geom *gp, boolean_t force);
63 static struct g_geom *g_label_taste(struct g_class *mp, struct g_provider *pp,
65 static void g_label_config(struct gctl_req *req, struct g_class *mp,
68 struct g_class g_label_class = {
69 .name = G_LABEL_CLASS_NAME,
71 .ctlreq = g_label_config,
72 .taste = g_label_taste,
73 .destroy_geom = g_label_destroy_geom
77 * To add a new file system where you want to look for volume labels,
79 * 1. Add a file g_label_<file system>.c which implements labels recognition.
80 * 2. Add an 'extern const struct g_label_desc g_label_<file system>;' into
82 * 3. Add an element to the table below '&g_label_<file system>,'.
83 * 4. Add your file to sys/conf/files.
84 * 5. Add your file to sys/modules/geom/geom_label/Makefile.
85 * 6. Add your file system to manual page sbin/geom/class/label/glabel.8.
87 const struct g_label_desc *g_labels[] = {
105 g_label_rtrim(char *label, size_t size)
109 for (i = size - 1; i >= 0; i--) {
110 if (label[i] == '\0')
112 else if (label[i] == ' ')
120 g_label_destroy_geom(struct gctl_req *req __unused, struct g_class *mp,
121 struct g_geom *gp __unused)
125 * XXX: Unloading a class which is using geom_slice:1.56 is currently
126 * XXX: broken, so we deny unloading when we have geoms.
132 g_label_orphan(struct g_consumer *cp)
135 G_LABEL_DEBUG(1, "Label %s removed.",
136 LIST_FIRST(&cp->geom->provider)->name);
141 g_label_spoiled(struct g_consumer *cp)
144 G_LABEL_DEBUG(1, "Label %s removed.",
145 LIST_FIRST(&cp->geom->provider)->name);
150 g_label_resize(struct g_consumer *cp)
153 G_LABEL_DEBUG(1, "Label %s resized.",
154 LIST_FIRST(&cp->geom->provider)->name);
156 g_slice_config(cp->geom, 0, G_SLICE_CONFIG_FORCE, (off_t)0,
157 cp->provider->mediasize, cp->provider->sectorsize, "notused");
161 g_label_is_name_ok(const char *label)
165 /* Check if the label starts from ../ */
166 if (strncmp(label, "../", 3) == 0)
168 /* Check if the label contains /../ */
169 if (strstr(label, "/../") != NULL)
171 /* Check if the label ends at ../ */
172 if ((s = strstr(label, "/..")) != NULL && s[3] == '\0')
178 g_label_mangle_name(char *label, size_t size)
183 sb = sbuf_new(NULL, NULL, size, SBUF_FIXEDLEN);
184 for (c = label; *c != '\0'; c++) {
185 if (!isprint(*c) || isspace(*c) || *c =='"' || *c == '%')
186 sbuf_printf(sb, "%%%02X", *c);
190 if (sbuf_finish(sb) != 0)
193 strlcpy(label, sbuf_data(sb), size);
197 static struct g_geom *
198 g_label_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp,
199 const char *label, const char *dir, off_t mediasize)
202 struct g_provider *pp2;
203 struct g_consumer *cp;
208 if (!g_label_is_name_ok(label)) {
209 G_LABEL_DEBUG(0, "%s contains suspicious label, skipping.",
211 G_LABEL_DEBUG(1, "%s suspicious label is: %s", pp->name, label);
213 gctl_error(req, "Label name %s is invalid.", label);
218 if (snprintf(name, sizeof(name), "%s/%s", dir, label) >= sizeof(name)) {
220 gctl_error(req, "Label name %s is too long.", label);
223 LIST_FOREACH(gp, &mp->geom, geom) {
224 pp2 = LIST_FIRST(&gp->provider);
227 if ((pp2->flags & G_PF_ORPHAN) != 0)
229 if (strcmp(pp2->name, name) == 0) {
230 G_LABEL_DEBUG(1, "Label %s(%s) already exists (%s).",
231 label, name, pp->name);
233 gctl_error(req, "Provider %s already exists.",
239 gp = g_slice_new(mp, 1, pp, &cp, NULL, 0, NULL);
241 G_LABEL_DEBUG(0, "Cannot create slice %s.", label);
243 gctl_error(req, "Cannot create slice %s.", label);
246 gp->orphan = g_label_orphan;
247 gp->spoiled = g_label_spoiled;
248 gp->resize = g_label_resize;
249 g_access(cp, -1, 0, 0);
250 g_slice_config(gp, 0, G_SLICE_CONFIG_SET, (off_t)0, mediasize,
251 pp->sectorsize, "%s", name);
252 G_LABEL_DEBUG(1, "Label for provider %s is %s.", pp->name, name);
257 g_label_destroy(struct g_geom *gp, boolean_t force)
259 struct g_provider *pp;
262 pp = LIST_FIRST(&gp->provider);
263 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
265 G_LABEL_DEBUG(0, "Provider %s is still open, so it "
266 "can't be definitely removed.", pp->name);
269 "Provider %s is still open (r%dw%de%d).", pp->name,
270 pp->acr, pp->acw, pp->ace);
273 } else if (pp != NULL)
274 G_LABEL_DEBUG(1, "Label %s removed.", pp->name);
275 g_slice_spoiled(LIST_FIRST(&gp->consumer));
280 g_label_read_metadata(struct g_consumer *cp, struct g_label_metadata *md)
282 struct g_provider *pp;
290 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
295 /* Decode metadata. */
296 label_metadata_decode(buf, md);
303 g_label_orphan_taste(struct g_consumer *cp __unused)
306 KASSERT(1 == 0, ("%s called?", __func__));
310 g_label_start_taste(struct bio *bp __unused)
313 KASSERT(1 == 0, ("%s called?", __func__));
317 g_label_access_taste(struct g_provider *pp __unused, int dr __unused,
318 int dw __unused, int de __unused)
321 KASSERT(1 == 0, ("%s called", __func__));
325 static struct g_geom *
326 g_label_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
328 struct g_label_metadata md;
329 struct g_consumer *cp;
333 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
336 G_LABEL_DEBUG(2, "Tasting %s.", pp->name);
338 /* Skip providers that are already open for writing. */
342 if (strcmp(pp->geom->class->name, mp->name) == 0)
345 gp = g_new_geomf(mp, "label:taste");
346 gp->start = g_label_start_taste;
347 gp->access = g_label_access_taste;
348 gp->orphan = g_label_orphan_taste;
349 cp = g_new_consumer(gp);
351 if (g_access(cp, 1, 0, 0) != 0)
354 if (g_label_read_metadata(cp, &md) != 0)
356 if (strcmp(md.md_magic, G_LABEL_MAGIC) != 0)
358 if (md.md_version > G_LABEL_VERSION) {
359 printf("geom_label.ko module is too old to handle %s.\n",
365 * Backward compatibility:
368 * There was no md_provsize field in earlier versions of
371 if (md.md_version < 2)
372 md.md_provsize = pp->mediasize;
374 if (md.md_provsize != pp->mediasize)
377 g_label_create(NULL, mp, pp, md.md_label, G_LABEL_DIR,
378 pp->mediasize - pp->sectorsize);
380 for (i = 0; g_labels[i] != NULL; i++) {
383 if (g_labels[i]->ld_enabled == 0)
386 g_labels[i]->ld_taste(cp, label, sizeof(label));
387 g_label_mangle_name(label, sizeof(label));
389 if (label[0] == '\0')
391 g_label_create(NULL, mp, pp, label, g_labels[i]->ld_dir,
394 g_access(cp, -1, 0, 0);
397 g_destroy_consumer(cp);
403 g_label_ctl_create(struct gctl_req *req, struct g_class *mp)
405 struct g_provider *pp;
411 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
413 gctl_error(req, "No '%s' argument", "nargs");
417 gctl_error(req, "Invalid number of arguments.");
421 * arg1 is the name of provider.
423 name = gctl_get_asciiparam(req, "arg1");
425 gctl_error(req, "No 'arg%d' argument", 1);
428 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
429 name += strlen("/dev/");
430 pp = g_provider_by_name(name);
432 G_LABEL_DEBUG(1, "Provider %s is invalid.", name);
433 gctl_error(req, "Provider %s is invalid.", name);
439 name = gctl_get_asciiparam(req, "arg0");
441 gctl_error(req, "No 'arg%d' argument", 0);
444 g_label_create(req, mp, pp, name, G_LABEL_DIR, pp->mediasize);
448 g_label_skip_dir(const char *name)
453 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
454 name += strlen("/dev/");
455 if (strncmp(name, G_LABEL_DIR "/", strlen(G_LABEL_DIR "/")) == 0)
456 name += strlen(G_LABEL_DIR "/");
457 for (i = 0; g_labels[i] != NULL; i++) {
458 snprintf(path, sizeof(path), "%s/", g_labels[i]->ld_dir);
459 if (strncmp(name, path, strlen(path)) == 0) {
460 name += strlen(path);
467 static struct g_geom *
468 g_label_find_geom(struct g_class *mp, const char *name)
471 struct g_provider *pp;
474 name = g_label_skip_dir(name);
475 LIST_FOREACH(gp, &mp->geom, geom) {
476 pp = LIST_FIRST(&gp->provider);
477 pname = g_label_skip_dir(pp->name);
478 if (strcmp(pname, name) == 0)
485 g_label_ctl_destroy(struct gctl_req *req, struct g_class *mp)
487 int *nargs, *force, error, i;
494 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
496 gctl_error(req, "No '%s' argument", "nargs");
500 gctl_error(req, "Missing device(s).");
503 force = gctl_get_paraml(req, "force", sizeof(*force));
505 gctl_error(req, "No 'force' argument");
509 for (i = 0; i < *nargs; i++) {
510 snprintf(param, sizeof(param), "arg%d", i);
511 name = gctl_get_asciiparam(req, param);
513 gctl_error(req, "No 'arg%d' argument", i);
516 gp = g_label_find_geom(mp, name);
518 G_LABEL_DEBUG(1, "Label %s is invalid.", name);
519 gctl_error(req, "Label %s is invalid.", name);
522 error = g_label_destroy(gp, *force);
524 gctl_error(req, "Cannot destroy label %s (error=%d).",
525 LIST_FIRST(&gp->provider)->name, error);
532 g_label_config(struct gctl_req *req, struct g_class *mp, const char *verb)
538 version = gctl_get_paraml(req, "version", sizeof(*version));
539 if (version == NULL) {
540 gctl_error(req, "No '%s' argument.", "version");
543 if (*version != G_LABEL_VERSION) {
544 gctl_error(req, "Userland and kernel parts are out of sync.");
548 if (strcmp(verb, "create") == 0) {
549 g_label_ctl_create(req, mp);
551 } else if (strcmp(verb, "destroy") == 0 ||
552 strcmp(verb, "stop") == 0) {
553 g_label_ctl_destroy(req, mp);
557 gctl_error(req, "Unknown verb.");
560 DECLARE_GEOM_CLASS(g_label_class, g_label);
561 MODULE_VERSION(geom_label, 0);