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bcachefs: create internal disk_groups sysfs file

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We have bch2_sb_disk_groups_to_text() to dump disk group labels, but
no good information on device group membership at runtime. Add
bch2_disk_groups_to_text() and an associated 'disk_groups' sysfs
file to print group and device relationships.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Brian Foster 2023-05-30 14:41:50 -04:00 committed by Kent Overstreet
parent 28551613b7
commit fec4fc82b5
3 changed files with 42 additions and 0 deletions
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34
fs/bcachefs/disk_groups.c
View File

@ -87,6 +87,40 @@ err:
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)

2
fs/bcachefs/disk_groups.h
View File

@ -88,4 +88,6 @@ int bch2_dev_group_set(struct bch_fs *, struct bch_dev *, const char *);
const char *bch2_sb_validate_disk_groups(struct bch_sb *,
struct bch_sb_field *);
void bch2_disk_groups_to_text(struct printbuf *, struct bch_fs *);
#endif /* _BCACHEFS_DISK_GROUPS_H */

6
fs/bcachefs/sysfs.c
View File

@ -223,6 +223,7 @@ static void bch2_write_refs_to_text(struct printbuf *out, struct bch_fs *c)
#endif
read_attribute(internal_uuid);
read_attribute(disk_groups);
read_attribute(has_data);
read_attribute(alloc_debug);
@ -471,6 +472,9 @@ SHOW(bch2_fs)
if (attr == &sysfs_nocow_lock_table)
bch2_nocow_locks_to_text(out, &c->nocow_locks);
if (attr == &sysfs_disk_groups)
bch2_disk_groups_to_text(out, c);
return 0;
}
@ -681,6 +685,8 @@ struct attribute *bch2_fs_internal_files[] = {
&sysfs_moving_ctxts,
&sysfs_internal_uuid,
&sysfs_disk_groups,
NULL
};