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e677179b35
We're going to be using bch2_target_to_text() -> bch2_disk_path_to_text() from bch2_bkey_ptrs_to_text() and bch2_bkey_ptrs_invalid(), which can be called in any context. This patch adds the actual label to bch_disk_group_cpu so that it can be used by bch2_disk_path_to_text, and splits out bch2_disk_path_to_text() into two variants - like the previous patch, one for when we have a running filesystem and another for when we only have a superblock. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
621 lines
13 KiB
C
621 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "bcachefs.h"
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#include "disk_groups.h"
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#include "sb-members.h"
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#include "super-io.h"
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#include <linux/sort.h>
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static int group_cmp(const void *_l, const void *_r)
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{
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const struct bch_disk_group *l = _l;
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const struct bch_disk_group *r = _r;
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return ((BCH_GROUP_DELETED(l) > BCH_GROUP_DELETED(r)) -
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(BCH_GROUP_DELETED(l) < BCH_GROUP_DELETED(r))) ?:
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((BCH_GROUP_PARENT(l) > BCH_GROUP_PARENT(r)) -
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(BCH_GROUP_PARENT(l) < BCH_GROUP_PARENT(r))) ?:
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strncmp(l->label, r->label, sizeof(l->label));
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}
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static int bch2_sb_disk_groups_validate(struct bch_sb *sb,
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struct bch_sb_field *f,
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struct printbuf *err)
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{
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struct bch_sb_field_disk_groups *groups =
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field_to_type(f, disk_groups);
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struct bch_disk_group *g, *sorted = NULL;
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unsigned nr_groups = disk_groups_nr(groups);
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unsigned i, len;
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int ret = 0;
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for (i = 0; i < sb->nr_devices; i++) {
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struct bch_member m = bch2_sb_member_get(sb, i);
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unsigned group_id;
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if (!BCH_MEMBER_GROUP(&m))
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continue;
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group_id = BCH_MEMBER_GROUP(&m) - 1;
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if (group_id >= nr_groups) {
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prt_printf(err, "disk %u has invalid label %u (have %u)",
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i, group_id, nr_groups);
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return -BCH_ERR_invalid_sb_disk_groups;
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}
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if (BCH_GROUP_DELETED(&groups->entries[group_id])) {
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prt_printf(err, "disk %u has deleted label %u", i, group_id);
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return -BCH_ERR_invalid_sb_disk_groups;
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}
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}
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if (!nr_groups)
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return 0;
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for (i = 0; i < nr_groups; i++) {
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g = groups->entries + i;
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if (BCH_GROUP_DELETED(g))
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continue;
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len = strnlen(g->label, sizeof(g->label));
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if (!len) {
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prt_printf(err, "label %u empty", i);
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return -BCH_ERR_invalid_sb_disk_groups;
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}
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}
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sorted = kmalloc_array(nr_groups, sizeof(*sorted), GFP_KERNEL);
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if (!sorted)
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return -BCH_ERR_ENOMEM_disk_groups_validate;
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memcpy(sorted, groups->entries, nr_groups * sizeof(*sorted));
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sort(sorted, nr_groups, sizeof(*sorted), group_cmp, NULL);
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for (g = sorted; g + 1 < sorted + nr_groups; g++)
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if (!BCH_GROUP_DELETED(g) &&
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!group_cmp(&g[0], &g[1])) {
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prt_printf(err, "duplicate label %llu.%.*s",
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BCH_GROUP_PARENT(g),
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(int) sizeof(g->label), g->label);
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ret = -BCH_ERR_invalid_sb_disk_groups;
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goto err;
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}
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err:
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kfree(sorted);
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return ret;
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}
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void bch2_disk_groups_to_text(struct printbuf *out, struct bch_fs *c)
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{
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struct bch_disk_groups_cpu *g;
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struct bch_dev *ca;
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int i;
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unsigned iter;
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out->atomic++;
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rcu_read_lock();
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g = rcu_dereference(c->disk_groups);
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if (!g)
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goto out;
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for (i = 0; i < g->nr; i++) {
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if (i)
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prt_printf(out, " ");
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if (g->entries[i].deleted) {
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prt_printf(out, "[deleted]");
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continue;
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}
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prt_printf(out, "[parent %d devs", g->entries[i].parent);
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for_each_member_device_rcu(ca, c, iter, &g->entries[i].devs)
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prt_printf(out, " %s", ca->name);
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prt_printf(out, "]");
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}
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out:
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rcu_read_unlock();
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out->atomic--;
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}
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static void bch2_sb_disk_groups_to_text(struct printbuf *out,
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struct bch_sb *sb,
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struct bch_sb_field *f)
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{
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struct bch_sb_field_disk_groups *groups =
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field_to_type(f, disk_groups);
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struct bch_disk_group *g;
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unsigned nr_groups = disk_groups_nr(groups);
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for (g = groups->entries;
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g < groups->entries + nr_groups;
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g++) {
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if (g != groups->entries)
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prt_printf(out, " ");
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if (BCH_GROUP_DELETED(g))
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prt_printf(out, "[deleted]");
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else
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prt_printf(out, "[parent %llu name %s]",
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BCH_GROUP_PARENT(g), g->label);
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}
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}
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const struct bch_sb_field_ops bch_sb_field_ops_disk_groups = {
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.validate = bch2_sb_disk_groups_validate,
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.to_text = bch2_sb_disk_groups_to_text
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};
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int bch2_sb_disk_groups_to_cpu(struct bch_fs *c)
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{
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struct bch_sb_field_disk_groups *groups;
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struct bch_disk_groups_cpu *cpu_g, *old_g;
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unsigned i, g, nr_groups;
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lockdep_assert_held(&c->sb_lock);
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groups = bch2_sb_field_get(c->disk_sb.sb, disk_groups);
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nr_groups = disk_groups_nr(groups);
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if (!groups)
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return 0;
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cpu_g = kzalloc(struct_size(cpu_g, entries, nr_groups), GFP_KERNEL);
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if (!cpu_g)
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return -BCH_ERR_ENOMEM_disk_groups_to_cpu;
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cpu_g->nr = nr_groups;
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for (i = 0; i < nr_groups; i++) {
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struct bch_disk_group *src = &groups->entries[i];
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struct bch_disk_group_cpu *dst = &cpu_g->entries[i];
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dst->deleted = BCH_GROUP_DELETED(src);
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dst->parent = BCH_GROUP_PARENT(src);
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memcpy(dst->label, src->label, sizeof(dst->label));
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}
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for (i = 0; i < c->disk_sb.sb->nr_devices; i++) {
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struct bch_member m = bch2_sb_member_get(c->disk_sb.sb, i);
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struct bch_disk_group_cpu *dst;
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if (!bch2_member_exists(&m))
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continue;
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g = BCH_MEMBER_GROUP(&m);
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while (g) {
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dst = &cpu_g->entries[g - 1];
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__set_bit(i, dst->devs.d);
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g = dst->parent;
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}
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}
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old_g = rcu_dereference_protected(c->disk_groups,
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lockdep_is_held(&c->sb_lock));
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rcu_assign_pointer(c->disk_groups, cpu_g);
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if (old_g)
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kfree_rcu(old_g, rcu);
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return 0;
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}
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const struct bch_devs_mask *bch2_target_to_mask(struct bch_fs *c, unsigned target)
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{
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struct target t = target_decode(target);
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struct bch_devs_mask *devs;
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rcu_read_lock();
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switch (t.type) {
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case TARGET_NULL:
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devs = NULL;
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break;
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case TARGET_DEV: {
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struct bch_dev *ca = t.dev < c->sb.nr_devices
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? rcu_dereference(c->devs[t.dev])
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: NULL;
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devs = ca ? &ca->self : NULL;
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break;
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}
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case TARGET_GROUP: {
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struct bch_disk_groups_cpu *g = rcu_dereference(c->disk_groups);
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devs = g && t.group < g->nr && !g->entries[t.group].deleted
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? &g->entries[t.group].devs
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: NULL;
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break;
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}
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default:
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BUG();
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}
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rcu_read_unlock();
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return devs;
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}
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bool bch2_dev_in_target(struct bch_fs *c, unsigned dev, unsigned target)
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{
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struct target t = target_decode(target);
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switch (t.type) {
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case TARGET_NULL:
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return false;
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case TARGET_DEV:
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return dev == t.dev;
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case TARGET_GROUP: {
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struct bch_disk_groups_cpu *g;
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const struct bch_devs_mask *m;
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bool ret;
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rcu_read_lock();
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g = rcu_dereference(c->disk_groups);
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m = g && t.group < g->nr && !g->entries[t.group].deleted
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? &g->entries[t.group].devs
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: NULL;
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ret = m ? test_bit(dev, m->d) : false;
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rcu_read_unlock();
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return ret;
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}
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default:
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BUG();
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}
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}
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static int __bch2_disk_group_find(struct bch_sb_field_disk_groups *groups,
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unsigned parent,
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const char *name, unsigned namelen)
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{
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unsigned i, nr_groups = disk_groups_nr(groups);
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if (!namelen || namelen > BCH_SB_LABEL_SIZE)
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return -EINVAL;
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for (i = 0; i < nr_groups; i++) {
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struct bch_disk_group *g = groups->entries + i;
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if (BCH_GROUP_DELETED(g))
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continue;
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if (!BCH_GROUP_DELETED(g) &&
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BCH_GROUP_PARENT(g) == parent &&
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strnlen(g->label, sizeof(g->label)) == namelen &&
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!memcmp(name, g->label, namelen))
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return i;
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}
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return -1;
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}
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static int __bch2_disk_group_add(struct bch_sb_handle *sb, unsigned parent,
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const char *name, unsigned namelen)
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{
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struct bch_sb_field_disk_groups *groups =
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bch2_sb_field_get(sb->sb, disk_groups);
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unsigned i, nr_groups = disk_groups_nr(groups);
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struct bch_disk_group *g;
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if (!namelen || namelen > BCH_SB_LABEL_SIZE)
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return -EINVAL;
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for (i = 0;
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i < nr_groups && !BCH_GROUP_DELETED(&groups->entries[i]);
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i++)
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;
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if (i == nr_groups) {
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unsigned u64s =
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(sizeof(struct bch_sb_field_disk_groups) +
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sizeof(struct bch_disk_group) * (nr_groups + 1)) /
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sizeof(u64);
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groups = bch2_sb_field_resize(sb, disk_groups, u64s);
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if (!groups)
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return -BCH_ERR_ENOSPC_disk_label_add;
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nr_groups = disk_groups_nr(groups);
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}
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BUG_ON(i >= nr_groups);
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g = &groups->entries[i];
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memcpy(g->label, name, namelen);
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if (namelen < sizeof(g->label))
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g->label[namelen] = '\0';
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SET_BCH_GROUP_DELETED(g, 0);
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SET_BCH_GROUP_PARENT(g, parent);
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SET_BCH_GROUP_DATA_ALLOWED(g, ~0);
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return i;
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}
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int bch2_disk_path_find(struct bch_sb_handle *sb, const char *name)
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{
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struct bch_sb_field_disk_groups *groups =
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bch2_sb_field_get(sb->sb, disk_groups);
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int v = -1;
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do {
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const char *next = strchrnul(name, '.');
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unsigned len = next - name;
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if (*next == '.')
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next++;
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v = __bch2_disk_group_find(groups, v + 1, name, len);
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name = next;
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} while (*name && v >= 0);
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return v;
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}
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int bch2_disk_path_find_or_create(struct bch_sb_handle *sb, const char *name)
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{
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struct bch_sb_field_disk_groups *groups;
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unsigned parent = 0;
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int v = -1;
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do {
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const char *next = strchrnul(name, '.');
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unsigned len = next - name;
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if (*next == '.')
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next++;
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groups = bch2_sb_field_get(sb->sb, disk_groups);
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v = __bch2_disk_group_find(groups, parent, name, len);
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if (v < 0)
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v = __bch2_disk_group_add(sb, parent, name, len);
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if (v < 0)
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return v;
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parent = v + 1;
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name = next;
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} while (*name && v >= 0);
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return v;
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}
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void bch2_disk_path_to_text(struct printbuf *out, struct bch_fs *c, unsigned v)
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{
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struct bch_disk_groups_cpu *groups;
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struct bch_disk_group_cpu *g;
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unsigned nr = 0;
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u16 path[32];
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out->atomic++;
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rcu_read_lock();
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groups = rcu_dereference(c->disk_groups);
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if (!groups)
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goto invalid;
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while (1) {
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if (nr == ARRAY_SIZE(path))
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goto invalid;
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if (v >= groups->nr)
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goto invalid;
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g = groups->entries + v;
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if (g->deleted)
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goto invalid;
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path[nr++] = v;
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if (!g->parent)
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break;
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v = g->parent - 1;
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}
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while (nr) {
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v = path[--nr];
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g = groups->entries + v;
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prt_printf(out, "%.*s", (int) sizeof(g->label), g->label);
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if (nr)
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prt_printf(out, ".");
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}
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out:
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rcu_read_unlock();
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out->atomic--;
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return;
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invalid:
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prt_printf(out, "invalid label %u", v);
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goto out;
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}
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void bch2_disk_path_to_text_sb(struct printbuf *out, struct bch_sb *sb, unsigned v)
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{
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struct bch_sb_field_disk_groups *groups =
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bch2_sb_field_get(sb, disk_groups);
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struct bch_disk_group *g;
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unsigned nr = 0;
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u16 path[32];
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while (1) {
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if (nr == ARRAY_SIZE(path))
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goto inval;
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if (v >= disk_groups_nr(groups))
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goto inval;
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g = groups->entries + v;
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if (BCH_GROUP_DELETED(g))
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goto inval;
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path[nr++] = v;
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if (!BCH_GROUP_PARENT(g))
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break;
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v = BCH_GROUP_PARENT(g) - 1;
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}
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while (nr) {
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v = path[--nr];
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g = groups->entries + v;
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prt_printf(out, "%.*s", (int) sizeof(g->label), g->label);
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if (nr)
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prt_printf(out, ".");
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}
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return;
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inval:
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prt_printf(out, "invalid label %u", v);
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}
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int __bch2_dev_group_set(struct bch_fs *c, struct bch_dev *ca, const char *name)
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{
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struct bch_member *mi;
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int ret, v = -1;
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if (!strlen(name) || !strcmp(name, "none"))
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return 0;
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v = bch2_disk_path_find_or_create(&c->disk_sb, name);
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if (v < 0)
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return v;
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ret = bch2_sb_disk_groups_to_cpu(c);
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if (ret)
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return ret;
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mi = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx);
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SET_BCH_MEMBER_GROUP(mi, v + 1);
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return 0;
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}
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int bch2_dev_group_set(struct bch_fs *c, struct bch_dev *ca, const char *name)
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{
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int ret;
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mutex_lock(&c->sb_lock);
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ret = __bch2_dev_group_set(c, ca, name) ?:
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bch2_write_super(c);
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mutex_unlock(&c->sb_lock);
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return ret;
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}
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int bch2_opt_target_parse(struct bch_fs *c, const char *val, u64 *res,
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struct printbuf *err)
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{
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struct bch_dev *ca;
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int g;
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|
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if (!val)
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return -EINVAL;
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|
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if (!c)
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return 0;
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if (!strlen(val) || !strcmp(val, "none")) {
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*res = 0;
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return 0;
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}
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|
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/* 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;
|
|
|
|
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();
|
|
break;
|
|
}
|
|
case TARGET_GROUP:
|
|
bch2_disk_path_to_text(out, c, t.group);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
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);
|
|
}
|