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/sysctl.h>
38 #include <sys/malloc.h>
39 #include <sys/libkern.h>
40 #include <geom/geom.h>
41 #include <geom/geom_slice.h>
42 #include <geom/label/g_label.h>
45 SYSCTL_DECL(_kern_geom);
46 SYSCTL_NODE(_kern_geom, OID_AUTO, label, CTLFLAG_RW, 0, "GEOM_LABEL stuff");
47 u_int g_label_debug = 0;
48 TUNABLE_INT("kern.geom.label.debug", &g_label_debug);
49 SYSCTL_UINT(_kern_geom_label, OID_AUTO, debug, CTLFLAG_RW, &g_label_debug, 0,
52 static int g_label_destroy_geom(struct gctl_req *req, struct g_class *mp,
54 static int g_label_destroy(struct g_geom *gp, boolean_t force);
55 static struct g_geom *g_label_taste(struct g_class *mp, struct g_provider *pp,
57 static void g_label_config(struct gctl_req *req, struct g_class *mp,
60 struct g_class g_label_class = {
61 .name = G_LABEL_CLASS_NAME,
63 .ctlreq = g_label_config,
64 .taste = g_label_taste,
65 .destroy_geom = g_label_destroy_geom
69 * To add a new file system where you want to look for volume labels,
71 * 1. Add a file g_label_<file system>.c which implements labels recognition.
72 * 2. Add an 'extern const struct g_label_desc g_label_<file system>;' into
74 * 3. Add an element to the table below '&g_label_<file system>,'.
75 * 4. Add your file to sys/conf/files.
76 * 5. Add your file to sys/modules/geom/geom_label/Makefile.
77 * 6. Add your file system to manual page sbin/geom/class/label/glabel.8.
79 const struct g_label_desc *g_labels[] = {
94 g_label_destroy_geom(struct gctl_req *req __unused, struct g_class *mp,
95 struct g_geom *gp __unused)
99 * XXX: Unloading a class which is using geom_slice:1.56 is currently
100 * XXX: broken, so we deny unloading when we have geoms.
106 g_label_orphan(struct g_consumer *cp)
109 G_LABEL_DEBUG(1, "Label %s removed.",
110 LIST_FIRST(&cp->geom->provider)->name);
115 g_label_spoiled(struct g_consumer *cp)
118 G_LABEL_DEBUG(1, "Label %s removed.",
119 LIST_FIRST(&cp->geom->provider)->name);
124 g_label_is_name_ok(const char *label)
128 /* Check is the label starts from ../ */
129 if (strncmp(label, "../", 3) == 0)
131 /* Check is the label contains /../ */
132 if (strstr(label, "/../") != NULL)
134 /* Check is the label ends at ../ */
135 if ((s = strstr(label, "/..")) != NULL && s[3] == '\0')
140 static struct g_geom *
141 g_label_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp,
142 const char *label, const char *dir, off_t mediasize)
145 struct g_provider *pp2;
146 struct g_consumer *cp;
151 if (!g_label_is_name_ok(label)) {
152 G_LABEL_DEBUG(0, "%s contains suspicious label, skipping.",
154 G_LABEL_DEBUG(1, "%s suspicious label is: %s", pp->name, label);
159 snprintf(name, sizeof(name), "%s/%s", dir, label);
160 LIST_FOREACH(gp, &mp->geom, geom) {
161 pp2 = LIST_FIRST(&gp->provider);
164 if (strcmp(pp2->name, name) == 0) {
165 G_LABEL_DEBUG(1, "Label %s(%s) already exists (%s).",
166 label, name, pp->name);
168 gctl_error(req, "Provider %s already exists.",
174 gp = g_slice_new(mp, 1, pp, &cp, NULL, 0, NULL);
176 G_LABEL_DEBUG(0, "Cannot create slice %s.", label);
178 gctl_error(req, "Cannot create slice %s.", label);
181 gp->orphan = g_label_orphan;
182 gp->spoiled = g_label_spoiled;
183 g_access(cp, -1, 0, 0);
184 g_slice_config(gp, 0, G_SLICE_CONFIG_SET, (off_t)0, mediasize,
185 pp->sectorsize, name);
186 G_LABEL_DEBUG(1, "Label for provider %s is %s.", pp->name, name);
191 g_label_destroy(struct g_geom *gp, boolean_t force)
193 struct g_provider *pp;
196 pp = LIST_FIRST(&gp->provider);
197 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
199 G_LABEL_DEBUG(0, "Provider %s is still open, so it "
200 "can't be definitely removed.", pp->name);
203 "Provider %s is still open (r%dw%de%d).", pp->name,
204 pp->acr, pp->acw, pp->ace);
208 G_LABEL_DEBUG(1, "Label %s removed.",
209 LIST_FIRST(&gp->provider)->name);
211 g_slice_spoiled(LIST_FIRST(&gp->consumer));
216 g_label_read_metadata(struct g_consumer *cp, struct g_label_metadata *md)
218 struct g_provider *pp;
226 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
231 /* Decode metadata. */
232 label_metadata_decode(buf, md);
239 g_label_orphan_taste(struct g_consumer *cp __unused)
242 KASSERT(1 == 0, ("%s called?", __func__));
246 g_label_start_taste(struct bio *bp __unused)
249 KASSERT(1 == 0, ("%s called?", __func__));
253 g_label_access_taste(struct g_provider *pp __unused, int dr __unused,
254 int dw __unused, int de __unused)
257 KASSERT(1 == 0, ("%s called", __func__));
261 static struct g_geom *
262 g_label_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
264 struct g_label_metadata md;
265 struct g_consumer *cp;
269 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
272 G_LABEL_DEBUG(2, "Tasting %s.", pp->name);
274 /* Skip providers that are already open for writing. */
278 if (strcmp(pp->geom->class->name, mp->name) == 0)
281 gp = g_new_geomf(mp, "label:taste");
282 gp->start = g_label_start_taste;
283 gp->access = g_label_access_taste;
284 gp->orphan = g_label_orphan_taste;
285 cp = g_new_consumer(gp);
287 if (g_access(cp, 1, 0, 0) != 0)
290 if (g_label_read_metadata(cp, &md) != 0)
292 if (strcmp(md.md_magic, G_LABEL_MAGIC) != 0)
294 if (md.md_version > G_LABEL_VERSION) {
295 printf("geom_label.ko module is too old to handle %s.\n",
301 * Backward compatibility:
304 * There was no md_provsize field in earlier versions of
307 if (md.md_version < 2)
308 md.md_provsize = pp->mediasize;
310 if (md.md_provsize != pp->mediasize)
313 g_label_create(NULL, mp, pp, md.md_label, G_LABEL_DIR,
314 pp->mediasize - pp->sectorsize);
316 for (i = 0; g_labels[i] != NULL; i++) {
320 g_labels[i]->ld_taste(cp, label, sizeof(label));
322 if (label[0] == '\0')
324 g_label_create(NULL, mp, pp, label, g_labels[i]->ld_dir,
327 g_access(cp, -1, 0, 0);
330 g_destroy_consumer(cp);
336 g_label_ctl_create(struct gctl_req *req, struct g_class *mp)
338 struct g_provider *pp;
344 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
346 gctl_error(req, "No '%s' argument", "nargs");
350 gctl_error(req, "Invalid number of argument.");
354 * arg1 is the name of provider.
356 name = gctl_get_asciiparam(req, "arg1");
358 gctl_error(req, "No 'arg%d' argument", 1);
361 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
362 name += strlen("/dev/");
363 pp = g_provider_by_name(name);
365 G_LABEL_DEBUG(1, "Provider %s is invalid.", name);
366 gctl_error(req, "Provider %s is invalid.", name);
372 name = gctl_get_asciiparam(req, "arg0");
374 gctl_error(req, "No 'arg%d' argument", 0);
377 g_label_create(req, mp, pp, name, G_LABEL_DIR, pp->mediasize);
381 g_label_skip_dir(const char *name)
386 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
387 name += strlen("/dev/");
388 if (strncmp(name, G_LABEL_DIR "/", strlen(G_LABEL_DIR "/")) == 0)
389 name += strlen(G_LABEL_DIR "/");
390 for (i = 0; g_labels[i] != NULL; i++) {
391 snprintf(path, sizeof(path), "%s/", g_labels[i]->ld_dir);
392 if (strncmp(name, path, strlen(path)) == 0) {
393 name += strlen(path);
400 static struct g_geom *
401 g_label_find_geom(struct g_class *mp, const char *name)
404 struct g_provider *pp;
407 name = g_label_skip_dir(name);
408 LIST_FOREACH(gp, &mp->geom, geom) {
409 pp = LIST_FIRST(&gp->provider);
410 pname = g_label_skip_dir(pp->name);
411 if (strcmp(pname, name) == 0)
418 g_label_ctl_destroy(struct gctl_req *req, struct g_class *mp)
420 int *nargs, *force, error, i;
427 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
429 gctl_error(req, "No '%s' argument", "nargs");
433 gctl_error(req, "Missing device(s).");
436 force = gctl_get_paraml(req, "force", sizeof(*force));
438 gctl_error(req, "No 'force' argument");
442 for (i = 0; i < *nargs; i++) {
443 snprintf(param, sizeof(param), "arg%d", i);
444 name = gctl_get_asciiparam(req, param);
446 gctl_error(req, "No 'arg%d' argument", i);
449 gp = g_label_find_geom(mp, name);
451 G_LABEL_DEBUG(1, "Label %s is invalid.", name);
452 gctl_error(req, "Label %s is invalid.", name);
455 error = g_label_destroy(gp, *force);
457 gctl_error(req, "Cannot destroy label %s (error=%d).",
458 LIST_FIRST(&gp->provider)->name, error);
465 g_label_config(struct gctl_req *req, struct g_class *mp, const char *verb)
471 version = gctl_get_paraml(req, "version", sizeof(*version));
472 if (version == NULL) {
473 gctl_error(req, "No '%s' argument.", "version");
476 if (*version != G_LABEL_VERSION) {
477 gctl_error(req, "Userland and kernel parts are out of sync.");
481 if (strcmp(verb, "create") == 0) {
482 g_label_ctl_create(req, mp);
484 } else if (strcmp(verb, "destroy") == 0 ||
485 strcmp(verb, "stop") == 0) {
486 g_label_ctl_destroy(req, mp);
490 gctl_error(req, "Unknown verb.");
493 DECLARE_GEOM_CLASS(g_label_class, g_label);