1 // SPDX-License-Identifier: GPL-2.0
3 #include "disk_groups.h"
4 #include "sb-members.h"
7 #include <linux/sort.h>
9 static int group_cmp(const void *_l, const void *_r)
11 const struct bch_disk_group *l = _l;
12 const struct bch_disk_group *r = _r;
14 return ((BCH_GROUP_DELETED(l) > BCH_GROUP_DELETED(r)) -
15 (BCH_GROUP_DELETED(l) < BCH_GROUP_DELETED(r))) ?:
16 ((BCH_GROUP_PARENT(l) > BCH_GROUP_PARENT(r)) -
17 (BCH_GROUP_PARENT(l) < BCH_GROUP_PARENT(r))) ?:
18 strncmp(l->label, r->label, sizeof(l->label));
21 static int bch2_sb_disk_groups_validate(struct bch_sb *sb,
22 struct bch_sb_field *f,
25 struct bch_sb_field_disk_groups *groups =
26 field_to_type(f, disk_groups);
27 struct bch_disk_group *g, *sorted = NULL;
28 unsigned nr_groups = disk_groups_nr(groups);
32 for (i = 0; i < sb->nr_devices; i++) {
33 struct bch_member m = bch2_sb_member_get(sb, i);
36 if (!BCH_MEMBER_GROUP(&m))
39 group_id = BCH_MEMBER_GROUP(&m) - 1;
41 if (group_id >= nr_groups) {
42 prt_printf(err, "disk %u has invalid label %u (have %u)",
43 i, group_id, nr_groups);
44 return -BCH_ERR_invalid_sb_disk_groups;
47 if (BCH_GROUP_DELETED(&groups->entries[group_id])) {
48 prt_printf(err, "disk %u has deleted label %u", i, group_id);
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_disk_groups *groups;
155 struct bch_disk_groups_cpu *cpu_g, *old_g;
156 unsigned i, g, nr_groups;
158 lockdep_assert_held(&c->sb_lock);
160 groups = bch2_sb_field_get(c->disk_sb.sb, disk_groups);
161 nr_groups = disk_groups_nr(groups);
166 cpu_g = kzalloc(struct_size(cpu_g, entries, nr_groups), GFP_KERNEL);
168 return -BCH_ERR_ENOMEM_disk_groups_to_cpu;
170 cpu_g->nr = nr_groups;
172 for (i = 0; i < nr_groups; i++) {
173 struct bch_disk_group *src = &groups->entries[i];
174 struct bch_disk_group_cpu *dst = &cpu_g->entries[i];
176 dst->deleted = BCH_GROUP_DELETED(src);
177 dst->parent = BCH_GROUP_PARENT(src);
178 memcpy(dst->label, src->label, sizeof(dst->label));
181 for (i = 0; i < c->disk_sb.sb->nr_devices; i++) {
182 struct bch_member m = bch2_sb_member_get(c->disk_sb.sb, i);
183 struct bch_disk_group_cpu *dst;
185 if (!bch2_member_exists(&m))
188 g = BCH_MEMBER_GROUP(&m);
190 dst = &cpu_g->entries[g - 1];
191 __set_bit(i, dst->devs.d);
196 old_g = rcu_dereference_protected(c->disk_groups,
197 lockdep_is_held(&c->sb_lock));
198 rcu_assign_pointer(c->disk_groups, cpu_g);
200 kfree_rcu(old_g, rcu);
205 const struct bch_devs_mask *bch2_target_to_mask(struct bch_fs *c, unsigned target)
207 struct target t = target_decode(target);
208 struct bch_devs_mask *devs;
217 struct bch_dev *ca = t.dev < c->sb.nr_devices
218 ? rcu_dereference(c->devs[t.dev])
220 devs = ca ? &ca->self : NULL;
224 struct bch_disk_groups_cpu *g = rcu_dereference(c->disk_groups);
226 devs = g && t.group < g->nr && !g->entries[t.group].deleted
227 ? &g->entries[t.group].devs
240 bool bch2_dev_in_target(struct bch_fs *c, unsigned dev, unsigned target)
242 struct target t = target_decode(target);
250 struct bch_disk_groups_cpu *g;
251 const struct bch_devs_mask *m;
255 g = rcu_dereference(c->disk_groups);
256 m = g && t.group < g->nr && !g->entries[t.group].deleted
257 ? &g->entries[t.group].devs
260 ret = m ? test_bit(dev, m->d) : false;
270 static int __bch2_disk_group_find(struct bch_sb_field_disk_groups *groups,
272 const char *name, unsigned namelen)
274 unsigned i, nr_groups = disk_groups_nr(groups);
276 if (!namelen || namelen > BCH_SB_LABEL_SIZE)
279 for (i = 0; i < nr_groups; i++) {
280 struct bch_disk_group *g = groups->entries + i;
282 if (BCH_GROUP_DELETED(g))
285 if (!BCH_GROUP_DELETED(g) &&
286 BCH_GROUP_PARENT(g) == parent &&
287 strnlen(g->label, sizeof(g->label)) == namelen &&
288 !memcmp(name, g->label, namelen))
295 static int __bch2_disk_group_add(struct bch_sb_handle *sb, unsigned parent,
296 const char *name, unsigned namelen)
298 struct bch_sb_field_disk_groups *groups =
299 bch2_sb_field_get(sb->sb, disk_groups);
300 unsigned i, nr_groups = disk_groups_nr(groups);
301 struct bch_disk_group *g;
303 if (!namelen || namelen > BCH_SB_LABEL_SIZE)
307 i < nr_groups && !BCH_GROUP_DELETED(&groups->entries[i]);
311 if (i == nr_groups) {
313 (sizeof(struct bch_sb_field_disk_groups) +
314 sizeof(struct bch_disk_group) * (nr_groups + 1)) /
317 groups = bch2_sb_field_resize(sb, disk_groups, u64s);
319 return -BCH_ERR_ENOSPC_disk_label_add;
321 nr_groups = disk_groups_nr(groups);
324 BUG_ON(i >= nr_groups);
326 g = &groups->entries[i];
328 memcpy(g->label, name, namelen);
329 if (namelen < sizeof(g->label))
330 g->label[namelen] = '\0';
331 SET_BCH_GROUP_DELETED(g, 0);
332 SET_BCH_GROUP_PARENT(g, parent);
333 SET_BCH_GROUP_DATA_ALLOWED(g, ~0);
338 int bch2_disk_path_find(struct bch_sb_handle *sb, const char *name)
340 struct bch_sb_field_disk_groups *groups =
341 bch2_sb_field_get(sb->sb, disk_groups);
345 const char *next = strchrnul(name, '.');
346 unsigned len = next - name;
351 v = __bch2_disk_group_find(groups, v + 1, name, len);
353 } while (*name && v >= 0);
358 int bch2_disk_path_find_or_create(struct bch_sb_handle *sb, const char *name)
360 struct bch_sb_field_disk_groups *groups;
365 const char *next = strchrnul(name, '.');
366 unsigned len = next - name;
371 groups = bch2_sb_field_get(sb->sb, disk_groups);
373 v = __bch2_disk_group_find(groups, parent, name, len);
375 v = __bch2_disk_group_add(sb, parent, name, len);
381 } while (*name && v >= 0);
386 void bch2_disk_path_to_text(struct printbuf *out, struct bch_fs *c, unsigned v)
388 struct bch_disk_groups_cpu *groups;
389 struct bch_disk_group_cpu *g;
395 groups = rcu_dereference(c->disk_groups);
400 if (nr == ARRAY_SIZE(path))
406 g = groups->entries + v;
421 g = groups->entries + v;
423 prt_printf(out, "%.*s", (int) sizeof(g->label), g->label);
425 prt_printf(out, ".");
432 prt_printf(out, "invalid label %u", v);
436 void bch2_disk_path_to_text_sb(struct printbuf *out, struct bch_sb *sb, unsigned v)
438 struct bch_sb_field_disk_groups *groups =
439 bch2_sb_field_get(sb, disk_groups);
440 struct bch_disk_group *g;
445 if (nr == ARRAY_SIZE(path))
448 if (v >= disk_groups_nr(groups))
451 g = groups->entries + v;
453 if (BCH_GROUP_DELETED(g))
458 if (!BCH_GROUP_PARENT(g))
461 v = BCH_GROUP_PARENT(g) - 1;
466 g = groups->entries + v;
468 prt_printf(out, "%.*s", (int) sizeof(g->label), g->label);
470 prt_printf(out, ".");
474 prt_printf(out, "invalid label %u", v);
477 int __bch2_dev_group_set(struct bch_fs *c, struct bch_dev *ca, const char *name)
479 struct bch_member *mi;
482 if (!strlen(name) || !strcmp(name, "none"))
485 v = bch2_disk_path_find_or_create(&c->disk_sb, name);
489 ret = bch2_sb_disk_groups_to_cpu(c);
493 mi = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx);
494 SET_BCH_MEMBER_GROUP(mi, v + 1);
498 int bch2_dev_group_set(struct bch_fs *c, struct bch_dev *ca, const char *name)
502 mutex_lock(&c->sb_lock);
503 ret = __bch2_dev_group_set(c, ca, name) ?:
505 mutex_unlock(&c->sb_lock);
510 int bch2_opt_target_parse(struct bch_fs *c, const char *val, u64 *res,
511 struct printbuf *err)
522 if (!strlen(val) || !strcmp(val, "none")) {
527 /* Is it a device? */
528 ca = bch2_dev_lookup(c, val);
530 *res = dev_to_target(ca->dev_idx);
531 percpu_ref_put(&ca->ref);
535 mutex_lock(&c->sb_lock);
536 g = bch2_disk_path_find(&c->disk_sb, val);
537 mutex_unlock(&c->sb_lock);
540 *res = group_to_target(g);
547 void bch2_target_to_text(struct printbuf *out, struct bch_fs *c, unsigned v)
549 struct target t = target_decode(v);
553 prt_printf(out, "none");
560 ca = t.dev < c->sb.nr_devices
561 ? rcu_dereference(c->devs[t.dev])
564 if (ca && percpu_ref_tryget(&ca->io_ref)) {
565 prt_printf(out, "/dev/%pg", ca->disk_sb.bdev);
566 percpu_ref_put(&ca->io_ref);
568 prt_printf(out, "offline device %u", t.dev);
570 prt_printf(out, "invalid device %u", t.dev);
578 bch2_disk_path_to_text(out, c, t.group);
585 static void bch2_target_to_text_sb(struct printbuf *out, struct bch_sb *sb, unsigned v)
587 struct target t = target_decode(v);
591 prt_printf(out, "none");
594 struct bch_member m = bch2_sb_member_get(sb, t.dev);
596 if (bch2_dev_exists(sb, t.dev)) {
597 prt_printf(out, "Device ");
598 pr_uuid(out, m.uuid.b);
599 prt_printf(out, " (%u)", t.dev);
601 prt_printf(out, "Bad device %u", t.dev);
606 bch2_disk_path_to_text_sb(out, sb, t.group);
613 void bch2_opt_target_to_text(struct printbuf *out,
619 bch2_target_to_text(out, c, v);
621 bch2_target_to_text_sb(out, sb, v);