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-rw-r--r--fs/bcachefs/disk_groups.c622
1 files changed, 622 insertions, 0 deletions
diff --git a/fs/bcachefs/disk_groups.c b/fs/bcachefs/disk_groups.c
new file mode 100644
index 0000000000..4d0cb0ccff
--- /dev/null
+++ b/fs/bcachefs/disk_groups.c
@@ -0,0 +1,622 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "bcachefs.h"
+#include "disk_groups.h"
+#include "sb-members.h"
+#include "super-io.h"
+
+#include <linux/sort.h>
+
+static int group_cmp(const void *_l, const void *_r)
+{
+ const struct bch_disk_group *l = _l;
+ const struct bch_disk_group *r = _r;
+
+ return ((BCH_GROUP_DELETED(l) > BCH_GROUP_DELETED(r)) -
+ (BCH_GROUP_DELETED(l) < BCH_GROUP_DELETED(r))) ?:
+ ((BCH_GROUP_PARENT(l) > BCH_GROUP_PARENT(r)) -
+ (BCH_GROUP_PARENT(l) < BCH_GROUP_PARENT(r))) ?:
+ strncmp(l->label, r->label, sizeof(l->label));
+}
+
+static int bch2_sb_disk_groups_validate(struct bch_sb *sb,
+ struct bch_sb_field *f,
+ struct printbuf *err)
+{
+ struct bch_sb_field_disk_groups *groups =
+ field_to_type(f, disk_groups);
+ struct bch_disk_group *g, *sorted = NULL;
+ unsigned nr_groups = disk_groups_nr(groups);
+ unsigned i, len;
+ int ret = 0;
+
+ for (i = 0; i < sb->nr_devices; i++) {
+ struct bch_member m = bch2_sb_member_get(sb, i);
+ unsigned group_id;
+
+ if (!BCH_MEMBER_GROUP(&m))
+ continue;
+
+ group_id = BCH_MEMBER_GROUP(&m) - 1;
+
+ if (group_id >= nr_groups) {
+ prt_printf(err, "disk %u has invalid label %u (have %u)",
+ i, group_id, nr_groups);
+ return -BCH_ERR_invalid_sb_disk_groups;
+ }
+
+ if (BCH_GROUP_DELETED(&groups->entries[group_id])) {
+ prt_printf(err, "disk %u has deleted label %u", i, group_id);
+ return -BCH_ERR_invalid_sb_disk_groups;
+ }
+ }
+
+ if (!nr_groups)
+ return 0;
+
+ for (i = 0; i < nr_groups; i++) {
+ g = groups->entries + i;
+
+ if (BCH_GROUP_DELETED(g))
+ continue;
+
+ len = strnlen(g->label, sizeof(g->label));
+ if (!len) {
+ prt_printf(err, "label %u empty", i);
+ return -BCH_ERR_invalid_sb_disk_groups;
+ }
+ }
+
+ sorted = kmalloc_array(nr_groups, sizeof(*sorted), GFP_KERNEL);
+ if (!sorted)
+ return -BCH_ERR_ENOMEM_disk_groups_validate;
+
+ memcpy(sorted, groups->entries, nr_groups * sizeof(*sorted));
+ sort(sorted, nr_groups, sizeof(*sorted), group_cmp, NULL);
+
+ for (g = sorted; g + 1 < sorted + nr_groups; g++)
+ if (!BCH_GROUP_DELETED(g) &&
+ !group_cmp(&g[0], &g[1])) {
+ prt_printf(err, "duplicate label %llu.%.*s",
+ BCH_GROUP_PARENT(g),
+ (int) sizeof(g->label), g->label);
+ ret = -BCH_ERR_invalid_sb_disk_groups;
+ goto err;
+ }
+err:
+ kfree(sorted);
+ return ret;
+}
+
+void bch2_disk_groups_to_text(struct printbuf *out, struct bch_fs *c)
+{
+ struct bch_disk_groups_cpu *g;
+ struct bch_dev *ca;
+ int i;
+ unsigned iter;
+
+ out->atomic++;
+ rcu_read_lock();
+
+ g = rcu_dereference(c->disk_groups);
+ if (!g)
+ goto out;
+
+ for (i = 0; i < g->nr; i++) {
+ if (i)
+ prt_printf(out, " ");
+
+ if (g->entries[i].deleted) {
+ prt_printf(out, "[deleted]");
+ continue;
+ }
+
+ prt_printf(out, "[parent %d devs", g->entries[i].parent);
+ for_each_member_device_rcu(ca, c, iter, &g->entries[i].devs)
+ prt_printf(out, " %s", ca->name);
+ prt_printf(out, "]");
+ }
+
+out:
+ rcu_read_unlock();
+ out->atomic--;
+}
+
+static void bch2_sb_disk_groups_to_text(struct printbuf *out,
+ struct bch_sb *sb,
+ struct bch_sb_field *f)
+{
+ struct bch_sb_field_disk_groups *groups =
+ field_to_type(f, disk_groups);
+ struct bch_disk_group *g;
+ unsigned nr_groups = disk_groups_nr(groups);
+
+ for (g = groups->entries;
+ g < groups->entries + nr_groups;
+ g++) {
+ if (g != groups->entries)
+ prt_printf(out, " ");
+
+ if (BCH_GROUP_DELETED(g))
+ prt_printf(out, "[deleted]");
+ else
+ prt_printf(out, "[parent %llu name %s]",
+ BCH_GROUP_PARENT(g), g->label);
+ }
+}
+
+const struct bch_sb_field_ops bch_sb_field_ops_disk_groups = {
+ .validate = bch2_sb_disk_groups_validate,
+ .to_text = bch2_sb_disk_groups_to_text
+};
+
+int bch2_sb_disk_groups_to_cpu(struct bch_fs *c)
+{
+ struct bch_sb_field_disk_groups *groups;
+ struct bch_disk_groups_cpu *cpu_g, *old_g;
+ unsigned i, g, nr_groups;
+
+ lockdep_assert_held(&c->sb_lock);
+
+ groups = bch2_sb_field_get(c->disk_sb.sb, disk_groups);
+ nr_groups = disk_groups_nr(groups);
+
+ if (!groups)
+ return 0;
+
+ cpu_g = kzalloc(struct_size(cpu_g, entries, nr_groups), GFP_KERNEL);
+ if (!cpu_g)
+ return -BCH_ERR_ENOMEM_disk_groups_to_cpu;
+
+ cpu_g->nr = nr_groups;
+
+ for (i = 0; i < nr_groups; i++) {
+ struct bch_disk_group *src = &groups->entries[i];
+ struct bch_disk_group_cpu *dst = &cpu_g->entries[i];
+
+ dst->deleted = BCH_GROUP_DELETED(src);
+ dst->parent = BCH_GROUP_PARENT(src);
+ memcpy(dst->label, src->label, sizeof(dst->label));
+ }
+
+ for (i = 0; i < c->disk_sb.sb->nr_devices; i++) {
+ struct bch_member m = bch2_sb_member_get(c->disk_sb.sb, i);
+ struct bch_disk_group_cpu *dst;
+
+ if (!bch2_member_exists(&m))
+ continue;
+
+ g = BCH_MEMBER_GROUP(&m);
+ while (g) {
+ dst = &cpu_g->entries[g - 1];
+ __set_bit(i, dst->devs.d);
+ g = dst->parent;
+ }
+ }
+
+ old_g = rcu_dereference_protected(c->disk_groups,
+ lockdep_is_held(&c->sb_lock));
+ rcu_assign_pointer(c->disk_groups, cpu_g);
+ if (old_g)
+ kfree_rcu(old_g, rcu);
+
+ return 0;
+}
+
+const struct bch_devs_mask *bch2_target_to_mask(struct bch_fs *c, unsigned target)
+{
+ struct target t = target_decode(target);
+ struct bch_devs_mask *devs;
+
+ rcu_read_lock();
+
+ switch (t.type) {
+ case TARGET_NULL:
+ devs = NULL;
+ break;
+ case TARGET_DEV: {
+ struct bch_dev *ca = t.dev < c->sb.nr_devices
+ ? rcu_dereference(c->devs[t.dev])
+ : NULL;
+ devs = ca ? &ca->self : NULL;
+ break;
+ }
+ case TARGET_GROUP: {
+ struct bch_disk_groups_cpu *g = rcu_dereference(c->disk_groups);
+
+ devs = g && t.group < g->nr && !g->entries[t.group].deleted
+ ? &g->entries[t.group].devs
+ : NULL;
+ break;
+ }
+ default:
+ BUG();
+ }
+
+ rcu_read_unlock();
+
+ return devs;
+}
+
+bool bch2_dev_in_target(struct bch_fs *c, unsigned dev, unsigned target)
+{
+ struct target t = target_decode(target);
+
+ switch (t.type) {
+ case TARGET_NULL:
+ return false;
+ case TARGET_DEV:
+ return dev == t.dev;
+ case TARGET_GROUP: {
+ struct bch_disk_groups_cpu *g;
+ const struct bch_devs_mask *m;
+ bool ret;
+
+ rcu_read_lock();
+ g = rcu_dereference(c->disk_groups);
+ m = g && t.group < g->nr && !g->entries[t.group].deleted
+ ? &g->entries[t.group].devs
+ : NULL;
+
+ ret = m ? test_bit(dev, m->d) : false;
+ rcu_read_unlock();
+
+ return ret;
+ }
+ default:
+ BUG();
+ }
+}
+
+static int __bch2_disk_group_find(struct bch_sb_field_disk_groups *groups,
+ unsigned parent,
+ const char *name, unsigned namelen)
+{
+ unsigned i, nr_groups = disk_groups_nr(groups);
+
+ if (!namelen || namelen > BCH_SB_LABEL_SIZE)
+ return -EINVAL;
+
+ for (i = 0; i < nr_groups; i++) {
+ struct bch_disk_group *g = groups->entries + i;
+
+ if (BCH_GROUP_DELETED(g))
+ continue;
+
+ if (!BCH_GROUP_DELETED(g) &&
+ BCH_GROUP_PARENT(g) == parent &&
+ strnlen(g->label, sizeof(g->label)) == namelen &&
+ !memcmp(name, g->label, namelen))
+ return i;
+ }
+
+ return -1;
+}
+
+static int __bch2_disk_group_add(struct bch_sb_handle *sb, unsigned parent,
+ const char *name, unsigned namelen)
+{
+ struct bch_sb_field_disk_groups *groups =
+ bch2_sb_field_get(sb->sb, disk_groups);
+ unsigned i, nr_groups = disk_groups_nr(groups);
+ struct bch_disk_group *g;
+
+ if (!namelen || namelen > BCH_SB_LABEL_SIZE)
+ return -EINVAL;
+
+ for (i = 0;
+ i < nr_groups && !BCH_GROUP_DELETED(&groups->entries[i]);
+ i++)
+ ;
+
+ if (i == nr_groups) {
+ unsigned u64s =
+ (sizeof(struct bch_sb_field_disk_groups) +
+ sizeof(struct bch_disk_group) * (nr_groups + 1)) /
+ sizeof(u64);
+
+ groups = bch2_sb_field_resize(sb, disk_groups, u64s);
+ if (!groups)
+ return -BCH_ERR_ENOSPC_disk_label_add;
+
+ nr_groups = disk_groups_nr(groups);
+ }
+
+ BUG_ON(i >= nr_groups);
+
+ g = &groups->entries[i];
+
+ memcpy(g->label, name, namelen);
+ if (namelen < sizeof(g->label))
+ g->label[namelen] = '\0';
+ SET_BCH_GROUP_DELETED(g, 0);
+ SET_BCH_GROUP_PARENT(g, parent);
+ SET_BCH_GROUP_DATA_ALLOWED(g, ~0);
+
+ return i;
+}
+
+int bch2_disk_path_find(struct bch_sb_handle *sb, const char *name)
+{
+ struct bch_sb_field_disk_groups *groups =
+ bch2_sb_field_get(sb->sb, disk_groups);
+ int v = -1;
+
+ do {
+ const char *next = strchrnul(name, '.');
+ unsigned len = next - name;
+
+ if (*next == '.')
+ next++;
+
+ v = __bch2_disk_group_find(groups, v + 1, name, len);
+ name = next;
+ } while (*name && v >= 0);
+
+ return v;
+}
+
+int bch2_disk_path_find_or_create(struct bch_sb_handle *sb, const char *name)
+{
+ struct bch_sb_field_disk_groups *groups;
+ unsigned parent = 0;
+ int v = -1;
+
+ do {
+ const char *next = strchrnul(name, '.');
+ unsigned len = next - name;
+
+ if (*next == '.')
+ next++;
+
+ groups = bch2_sb_field_get(sb->sb, disk_groups);
+
+ v = __bch2_disk_group_find(groups, parent, name, len);
+ if (v < 0)
+ v = __bch2_disk_group_add(sb, parent, name, len);
+ if (v < 0)
+ return v;
+
+ parent = v + 1;
+ name = next;
+ } while (*name && v >= 0);
+
+ return v;
+}
+
+void bch2_disk_path_to_text(struct printbuf *out, struct bch_fs *c, unsigned v)
+{
+ struct bch_disk_groups_cpu *groups;
+ struct bch_disk_group_cpu *g;
+ unsigned nr = 0;
+ u16 path[32];
+
+ out->atomic++;
+ rcu_read_lock();
+ groups = rcu_dereference(c->disk_groups);
+ if (!groups)
+ goto invalid;
+
+ while (1) {
+ if (nr == ARRAY_SIZE(path))
+ goto invalid;
+
+ if (v >= groups->nr)
+ goto invalid;
+
+ g = groups->entries + v;
+
+ if (g->deleted)
+ goto invalid;
+
+ path[nr++] = v;
+
+ if (!g->parent)
+ break;
+
+ v = g->parent - 1;
+ }
+
+ while (nr) {
+ v = path[--nr];
+ g = groups->entries + v;
+
+ prt_printf(out, "%.*s", (int) sizeof(g->label), g->label);
+ if (nr)
+ prt_printf(out, ".");
+ }
+out:
+ rcu_read_unlock();
+ out->atomic--;
+ return;
+invalid:
+ prt_printf(out, "invalid label %u", v);
+ goto out;
+}
+
+void bch2_disk_path_to_text_sb(struct printbuf *out, struct bch_sb *sb, unsigned v)
+{
+ struct bch_sb_field_disk_groups *groups =
+ bch2_sb_field_get(sb, disk_groups);
+ struct bch_disk_group *g;
+ unsigned nr = 0;
+ u16 path[32];
+
+ while (1) {
+ if (nr == ARRAY_SIZE(path))
+ goto inval;
+
+ if (v >= disk_groups_nr(groups))
+ goto inval;
+
+ g = groups->entries + v;
+
+ if (BCH_GROUP_DELETED(g))
+ goto inval;
+
+ path[nr++] = v;
+
+ if (!BCH_GROUP_PARENT(g))
+ break;
+
+ v = BCH_GROUP_PARENT(g) - 1;
+ }
+
+ while (nr) {
+ v = path[--nr];
+ g = groups->entries + v;
+
+ prt_printf(out, "%.*s", (int) sizeof(g->label), g->label);
+ if (nr)
+ prt_printf(out, ".");
+ }
+ return;
+inval:
+ prt_printf(out, "invalid label %u", v);
+}
+
+int __bch2_dev_group_set(struct bch_fs *c, struct bch_dev *ca, const char *name)
+{
+ struct bch_member *mi;
+ int ret, v = -1;
+
+ if (!strlen(name) || !strcmp(name, "none"))
+ return 0;
+
+ v = bch2_disk_path_find_or_create(&c->disk_sb, name);
+ if (v < 0)
+ return v;
+
+ ret = bch2_sb_disk_groups_to_cpu(c);
+ if (ret)
+ return ret;
+
+ mi = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx);
+ SET_BCH_MEMBER_GROUP(mi, v + 1);
+ return 0;
+}
+
+int bch2_dev_group_set(struct bch_fs *c, struct bch_dev *ca, const char *name)
+{
+ int ret;
+
+ mutex_lock(&c->sb_lock);
+ ret = __bch2_dev_group_set(c, ca, name) ?:
+ bch2_write_super(c);
+ mutex_unlock(&c->sb_lock);
+
+ return ret;
+}
+
+int bch2_opt_target_parse(struct bch_fs *c, const char *val, u64 *res,
+ struct printbuf *err)
+{
+ struct bch_dev *ca;
+ int g;
+
+ if (!val)
+ return -EINVAL;
+
+ if (!c)
+ return 0;
+
+ if (!strlen(val) || !strcmp(val, "none")) {
+ *res = 0;
+ return 0;
+ }
+
+ /* Is it a device? */
+ ca = bch2_dev_lookup(c, val);
+ if (!IS_ERR(ca)) {
+ *res = dev_to_target(ca->dev_idx);
+ percpu_ref_put(&ca->ref);
+ return 0;
+ }
+
+ mutex_lock(&c->sb_lock);
+ g = bch2_disk_path_find(&c->disk_sb, val);
+ mutex_unlock(&c->sb_lock);
+
+ if (g >= 0) {
+ *res = group_to_target(g);
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+void bch2_target_to_text(struct printbuf *out, struct bch_fs *c, unsigned v)
+{
+ struct target t = target_decode(v);
+
+ switch (t.type) {
+ case TARGET_NULL:
+ prt_printf(out, "none");
+ break;
+ case TARGET_DEV: {
+ struct bch_dev *ca;
+
+ out->atomic++;
+ rcu_read_lock();
+ ca = t.dev < c->sb.nr_devices
+ ? rcu_dereference(c->devs[t.dev])
+ : NULL;
+
+ if (ca && percpu_ref_tryget(&ca->io_ref)) {
+ prt_printf(out, "/dev/%pg", ca->disk_sb.bdev);
+ percpu_ref_put(&ca->io_ref);
+ } else if (ca) {
+ prt_printf(out, "offline device %u", t.dev);
+ } else {
+ prt_printf(out, "invalid device %u", t.dev);
+ }
+
+ rcu_read_unlock();
+ out->atomic--;
+ break;
+ }
+ case TARGET_GROUP:
+ bch2_disk_path_to_text(out, c, t.group);
+ break;
+ default:
+ BUG();
+ }
+}
+
+static void bch2_target_to_text_sb(struct printbuf *out, struct bch_sb *sb, unsigned v)
+{
+ struct target t = target_decode(v);
+
+ switch (t.type) {
+ case TARGET_NULL:
+ prt_printf(out, "none");
+ break;
+ case TARGET_DEV: {
+ struct bch_member m = bch2_sb_member_get(sb, t.dev);
+
+ if (bch2_dev_exists(sb, t.dev)) {
+ prt_printf(out, "Device ");
+ pr_uuid(out, m.uuid.b);
+ prt_printf(out, " (%u)", t.dev);
+ } else {
+ prt_printf(out, "Bad device %u", t.dev);
+ }
+ break;
+ }
+ case TARGET_GROUP:
+ bch2_disk_path_to_text_sb(out, sb, t.group);
+ break;
+ default:
+ BUG();
+ }
+}
+
+void bch2_opt_target_to_text(struct printbuf *out,
+ struct bch_fs *c,
+ struct bch_sb *sb,
+ u64 v)
+{
+ if (c)
+ bch2_target_to_text(out, c, v);
+ else
+ bch2_target_to_text_sb(out, sb, v);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 09:18:05 +0000