1 // SPDX-License-Identifier: GPL-2.0
3 #include "disk_groups.h"
6 #include <linux/sort.h>
8 static int group_cmp(const void *_l, const void *_r)
10 const struct bch_disk_group *l = _l;
11 const struct bch_disk_group *r = _r;
13 return ((BCH_GROUP_DELETED(l) > BCH_GROUP_DELETED(r)) -
14 (BCH_GROUP_DELETED(l) < BCH_GROUP_DELETED(r))) ?:
15 ((BCH_GROUP_PARENT(l) > BCH_GROUP_PARENT(r)) -
16 (BCH_GROUP_PARENT(l) < BCH_GROUP_PARENT(r))) ?:
17 strncmp(l->label, r->label, sizeof(l->label));
20 static int bch2_sb_disk_groups_validate(struct bch_sb *sb,
21 struct bch_sb_field *f,
24 struct bch_sb_field_disk_groups *groups =
25 field_to_type(f, disk_groups);
26 struct bch_disk_group *g, *sorted = NULL;
27 struct bch_sb_field_members *mi = bch2_sb_get_members(sb);
28 unsigned nr_groups = disk_groups_nr(groups);
32 for (i = 0; i < sb->nr_devices; i++) {
33 struct bch_member *m = mi->members + i;
36 if (!BCH_MEMBER_GROUP(m))
39 g = BCH_MEMBER_GROUP(m) - 1;
42 prt_printf(err, "disk %u has invalid label %u (have %u)",
44 return -BCH_ERR_invalid_sb_disk_groups;
47 if (BCH_GROUP_DELETED(&groups->entries[g])) {
48 prt_printf(err, "disk %u has deleted label %u", i, g);
49 return -BCH_ERR_invalid_sb_disk_groups;
56 for (i = 0; i < nr_groups; i++) {
57 g = groups->entries + i;
59 if (BCH_GROUP_DELETED(g))
62 len = strnlen(g->label, sizeof(g->label));
64 prt_printf(err, "label %u empty", i);
65 return -BCH_ERR_invalid_sb_disk_groups;
69 sorted = kmalloc_array(nr_groups, sizeof(*sorted), GFP_KERNEL);
71 return -BCH_ERR_ENOMEM_disk_groups_validate;
73 memcpy(sorted, groups->entries, nr_groups * sizeof(*sorted));
74 sort(sorted, nr_groups, sizeof(*sorted), group_cmp, NULL);
76 for (g = sorted; g + 1 < sorted + nr_groups; g++)
77 if (!BCH_GROUP_DELETED(g) &&
78 !group_cmp(&g[0], &g[1])) {
79 prt_printf(err, "duplicate label %llu.%.*s",
81 (int) sizeof(g->label), g->label);
82 ret = -BCH_ERR_invalid_sb_disk_groups;
90 void bch2_disk_groups_to_text(struct printbuf *out, struct bch_fs *c)
92 struct bch_disk_groups_cpu *g;
100 g = rcu_dereference(c->disk_groups);
104 for (i = 0; i < g->nr; i++) {
106 prt_printf(out, " ");
108 if (g->entries[i].deleted) {
109 prt_printf(out, "[deleted]");
113 prt_printf(out, "[parent %d devs", g->entries[i].parent);
114 for_each_member_device_rcu(ca, c, iter, &g->entries[i].devs)
115 prt_printf(out, " %s", ca->name);
116 prt_printf(out, "]");
124 static void bch2_sb_disk_groups_to_text(struct printbuf *out,
126 struct bch_sb_field *f)
128 struct bch_sb_field_disk_groups *groups =
129 field_to_type(f, disk_groups);
130 struct bch_disk_group *g;
131 unsigned nr_groups = disk_groups_nr(groups);
133 for (g = groups->entries;
134 g < groups->entries + nr_groups;
136 if (g != groups->entries)
137 prt_printf(out, " ");
139 if (BCH_GROUP_DELETED(g))
140 prt_printf(out, "[deleted]");
142 prt_printf(out, "[parent %llu name %s]",
143 BCH_GROUP_PARENT(g), g->label);
147 const struct bch_sb_field_ops bch_sb_field_ops_disk_groups = {
148 .validate = bch2_sb_disk_groups_validate,
149 .to_text = bch2_sb_disk_groups_to_text
152 int bch2_sb_disk_groups_to_cpu(struct bch_fs *c)
154 struct bch_sb_field_members *mi;
155 struct bch_sb_field_disk_groups *groups;
156 struct bch_disk_groups_cpu *cpu_g, *old_g;
157 unsigned i, g, nr_groups;
159 lockdep_assert_held(&c->sb_lock);
161 mi = bch2_sb_get_members(c->disk_sb.sb);
162 groups = bch2_sb_get_disk_groups(c->disk_sb.sb);
163 nr_groups = disk_groups_nr(groups);
168 cpu_g = kzalloc(sizeof(*cpu_g) +
169 sizeof(cpu_g->entries[0]) * nr_groups, GFP_KERNEL);
171 return -BCH_ERR_ENOMEM_disk_groups_to_cpu;
173 cpu_g->nr = nr_groups;
175 for (i = 0; i < nr_groups; i++) {
176 struct bch_disk_group *src = &groups->entries[i];
177 struct bch_disk_group_cpu *dst = &cpu_g->entries[i];
179 dst->deleted = BCH_GROUP_DELETED(src);
180 dst->parent = BCH_GROUP_PARENT(src);
183 for (i = 0; i < c->disk_sb.sb->nr_devices; i++) {
184 struct bch_member *m = mi->members + i;
185 struct bch_disk_group_cpu *dst =
186 &cpu_g->entries[BCH_MEMBER_GROUP(m)];
188 if (!bch2_member_exists(m))
191 g = BCH_MEMBER_GROUP(m);
193 dst = &cpu_g->entries[g - 1];
194 __set_bit(i, dst->devs.d);
199 old_g = rcu_dereference_protected(c->disk_groups,
200 lockdep_is_held(&c->sb_lock));
201 rcu_assign_pointer(c->disk_groups, cpu_g);
203 kfree_rcu(old_g, rcu);
208 const struct bch_devs_mask *bch2_target_to_mask(struct bch_fs *c, unsigned target)
210 struct target t = target_decode(target);
211 struct bch_devs_mask *devs;
220 struct bch_dev *ca = t.dev < c->sb.nr_devices
221 ? rcu_dereference(c->devs[t.dev])
223 devs = ca ? &ca->self : NULL;
227 struct bch_disk_groups_cpu *g = rcu_dereference(c->disk_groups);
229 devs = g && t.group < g->nr && !g->entries[t.group].deleted
230 ? &g->entries[t.group].devs
243 bool bch2_dev_in_target(struct bch_fs *c, unsigned dev, unsigned target)
245 struct target t = target_decode(target);
253 struct bch_disk_groups_cpu *g;
254 const struct bch_devs_mask *m;
258 g = rcu_dereference(c->disk_groups);
259 m = g && t.group < g->nr && !g->entries[t.group].deleted
260 ? &g->entries[t.group].devs
263 ret = m ? test_bit(dev, m->d) : false;
273 static int __bch2_disk_group_find(struct bch_sb_field_disk_groups *groups,
275 const char *name, unsigned namelen)
277 unsigned i, nr_groups = disk_groups_nr(groups);
279 if (!namelen || namelen > BCH_SB_LABEL_SIZE)
282 for (i = 0; i < nr_groups; i++) {
283 struct bch_disk_group *g = groups->entries + i;
285 if (BCH_GROUP_DELETED(g))
288 if (!BCH_GROUP_DELETED(g) &&
289 BCH_GROUP_PARENT(g) == parent &&
290 strnlen(g->label, sizeof(g->label)) == namelen &&
291 !memcmp(name, g->label, namelen))
298 static int __bch2_disk_group_add(struct bch_sb_handle *sb, unsigned parent,
299 const char *name, unsigned namelen)
301 struct bch_sb_field_disk_groups *groups =
302 bch2_sb_get_disk_groups(sb->sb);
303 unsigned i, nr_groups = disk_groups_nr(groups);
304 struct bch_disk_group *g;
306 if (!namelen || namelen > BCH_SB_LABEL_SIZE)
310 i < nr_groups && !BCH_GROUP_DELETED(&groups->entries[i]);
314 if (i == nr_groups) {
316 (sizeof(struct bch_sb_field_disk_groups) +
317 sizeof(struct bch_disk_group) * (nr_groups + 1)) /
320 groups = bch2_sb_resize_disk_groups(sb, u64s);
322 return -BCH_ERR_ENOSPC_disk_label_add;
324 nr_groups = disk_groups_nr(groups);
327 BUG_ON(i >= nr_groups);
329 g = &groups->entries[i];
331 memcpy(g->label, name, namelen);
332 if (namelen < sizeof(g->label))
333 g->label[namelen] = '\0';
334 SET_BCH_GROUP_DELETED(g, 0);
335 SET_BCH_GROUP_PARENT(g, parent);
336 SET_BCH_GROUP_DATA_ALLOWED(g, ~0);
341 int bch2_disk_path_find(struct bch_sb_handle *sb, const char *name)
343 struct bch_sb_field_disk_groups *groups =
344 bch2_sb_get_disk_groups(sb->sb);
348 const char *next = strchrnul(name, '.');
349 unsigned len = next - name;
354 v = __bch2_disk_group_find(groups, v + 1, name, len);
356 } while (*name && v >= 0);
361 int bch2_disk_path_find_or_create(struct bch_sb_handle *sb, const char *name)
363 struct bch_sb_field_disk_groups *groups;
368 const char *next = strchrnul(name, '.');
369 unsigned len = next - name;
374 groups = bch2_sb_get_disk_groups(sb->sb);
376 v = __bch2_disk_group_find(groups, parent, name, len);
378 v = __bch2_disk_group_add(sb, parent, name, len);
384 } while (*name && v >= 0);
389 void bch2_disk_path_to_text(struct printbuf *out, struct bch_sb *sb, unsigned v)
391 struct bch_sb_field_disk_groups *groups =
392 bch2_sb_get_disk_groups(sb);
393 struct bch_disk_group *g;
398 if (nr == ARRAY_SIZE(path))
401 if (v >= disk_groups_nr(groups))
404 g = groups->entries + v;
406 if (BCH_GROUP_DELETED(g))
411 if (!BCH_GROUP_PARENT(g))
414 v = BCH_GROUP_PARENT(g) - 1;
419 g = groups->entries + v;
421 prt_printf(out, "%.*s", (int) sizeof(g->label), g->label);
423 prt_printf(out, ".");
427 prt_printf(out, "invalid label %u", v);
430 int __bch2_dev_group_set(struct bch_fs *c, struct bch_dev *ca, const char *name)
432 struct bch_member *mi;
435 if (!strlen(name) || !strcmp(name, "none"))
438 v = bch2_disk_path_find_or_create(&c->disk_sb, name);
442 ret = bch2_sb_disk_groups_to_cpu(c);
446 mi = &bch2_sb_get_members(c->disk_sb.sb)->members[ca->dev_idx];
447 SET_BCH_MEMBER_GROUP(mi, v + 1);
451 int bch2_dev_group_set(struct bch_fs *c, struct bch_dev *ca, const char *name)
455 mutex_lock(&c->sb_lock);
456 ret = __bch2_dev_group_set(c, ca, name) ?:
458 mutex_unlock(&c->sb_lock);
463 int bch2_opt_target_parse(struct bch_fs *c, const char *val, u64 *res,
464 struct printbuf *err)
475 if (!strlen(val) || !strcmp(val, "none")) {
480 /* Is it a device? */
481 ca = bch2_dev_lookup(c, val);
483 *res = dev_to_target(ca->dev_idx);
484 percpu_ref_put(&ca->ref);
488 mutex_lock(&c->sb_lock);
489 g = bch2_disk_path_find(&c->disk_sb, val);
490 mutex_unlock(&c->sb_lock);
493 *res = group_to_target(g);
500 void bch2_opt_target_to_text(struct printbuf *out,
505 struct target t = target_decode(v);
509 prt_printf(out, "none");
516 ca = t.dev < c->sb.nr_devices
517 ? rcu_dereference(c->devs[t.dev])
520 if (ca && percpu_ref_tryget(&ca->io_ref)) {
521 prt_printf(out, "/dev/%pg", ca->disk_sb.bdev);
522 percpu_ref_put(&ca->io_ref);
524 prt_printf(out, "offline device %u", t.dev);
526 prt_printf(out, "invalid device %u", t.dev);
531 struct bch_sb_field_members *mi = bch2_sb_get_members(sb);
532 struct bch_member *m = mi->members + t.dev;
534 if (bch2_dev_exists(sb, mi, t.dev)) {
535 prt_printf(out, "Device ");
536 pr_uuid(out, m->uuid.b);
537 prt_printf(out, " (%u)", t.dev);
539 prt_printf(out, "Bad device %u", t.dev);
545 mutex_lock(&c->sb_lock);
546 bch2_disk_path_to_text(out, c->disk_sb.sb, t.group);
547 mutex_unlock(&c->sb_lock);
549 bch2_disk_path_to_text(out, sb, t.group);