Kernel/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-12-28 16:56:26 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

bcachefs: btree node scan: fall back to comparing by journal seq

Browse Source 
highly damaged filesystems, or filesystems that have been damaged and
repair and damaged again, may have sequence numbers we can't fully trust
- which in itself is something we need to debug.

Add a journal_seq fallback so that repair doesn't get stuck.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-07-12 14:16:01 -04:00
parent 375476c414
commit 6ec8623f7c
3 changed files with 41 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/bcachefs/btree_io.c
View File

@ -1006,6 +1006,7 @@ int bch2_btree_node_read_done(struct bch_fs *c, struct bch_dev *ca,
BTREE_PTR_RANGE_UPDATED(&bkey_i_to_btree_ptr_v2(&b->key)->v);
unsigned u64s;
unsigned ptr_written = btree_ptr_sectors_written(bkey_i_to_s_c(&b->key));
u64 max_journal_seq = 0;
struct printbuf buf = PRINTBUF;
int ret = 0, retry_read = 0, write = READ;
u64 start_time = local_clock();
@ -1181,6 +1182,8 @@ int bch2_btree_node_read_done(struct bch_fs *c, struct bch_dev *ca,
sort_iter_add(iter,
vstruct_idx(i, 0),
vstruct_last(i));
max_journal_seq = max(max_journal_seq, le64_to_cpu(i->journal_seq));
}
if (ptr_written) {
@ -1217,6 +1220,7 @@ int bch2_btree_node_read_done(struct bch_fs *c, struct bch_dev *ca,
swap(sorted, b->data);
set_btree_bset(b, b->set, &b->data->keys);
b->nsets = 1;
b->data->keys.journal_seq = cpu_to_le64(max_journal_seq);
BUG_ON(b->nr.live_u64s != u64s);

51
fs/bcachefs/btree_node_scan.c
View File

@ -22,7 +22,9 @@ struct find_btree_nodes_worker {
static void found_btree_node_to_text(struct printbuf *out, struct bch_fs *c, const struct found_btree_node *n)
{
prt_printf(out, "%s l=%u seq=%u cookie=%llx ", bch2_btree_id_str(n->btree_id), n->level, n->seq, n->cookie);
prt_printf(out, "%s l=%u seq=%u journal_seq=%llu cookie=%llx ",
bch2_btree_id_str(n->btree_id), n->level, n->seq,
n->journal_seq, n->cookie);
bch2_bpos_to_text(out, n->min_key);
prt_str(out, "-");
bch2_bpos_to_text(out, n->max_key);
@ -63,19 +65,37 @@ static void found_btree_node_to_key(struct bkey_i *k, const struct found_btree_n
memcpy(bp->v.start, f->ptrs, sizeof(struct bch_extent_ptr) * f->nr_ptrs);
}
static inline u64 bkey_journal_seq(struct bkey_s_c k)
{
switch (k.k->type) {
case KEY_TYPE_inode_v3:
return le64_to_cpu(bkey_s_c_to_inode_v3(k).v->bi_journal_seq);
default:
return 0;
}
}
static bool found_btree_node_is_readable(struct btree_trans *trans,
struct found_btree_node *f)
{
struct { __BKEY_PADDED(k, BKEY_BTREE_PTR_VAL_U64s_MAX); } k;
struct { __BKEY_PADDED(k, BKEY_BTREE_PTR_VAL_U64s_MAX); } tmp;
found_btree_node_to_key(&k.k, f);
found_btree_node_to_key(&tmp.k, f);
struct btree *b = bch2_btree_node_get_noiter(trans, &k.k, f->btree_id, f->level, false);
struct btree *b = bch2_btree_node_get_noiter(trans, &tmp.k, f->btree_id, f->level, false);
bool ret = !IS_ERR_OR_NULL(b);
if (!ret)
return ret;
f->sectors_written = b->written;
f->journal_seq = le64_to_cpu(b->data->keys.journal_seq);
struct bkey_s_c k;
struct bkey unpacked;
struct btree_node_iter iter;
for_each_btree_node_key_unpack(b, k, &iter, &unpacked)
f->journal_seq = max(f->journal_seq, bkey_journal_seq(k));
six_unlock_read(&b->c.lock);
/*
@ -84,7 +104,7 @@ static bool found_btree_node_is_readable(struct btree_trans *trans,
* this node
*/
if (b != btree_node_root(trans->c, b))
bch2_btree_node_evict(trans, &k.k);
bch2_btree_node_evict(trans, &tmp.k);
return ret;
}
@ -105,7 +125,8 @@ static int found_btree_node_cmp_cookie(const void *_l, const void *_r)
static int found_btree_node_cmp_time(const struct found_btree_node *l,
const struct found_btree_node *r)
{
return cmp_int(l->seq, r->seq);
return cmp_int(l->seq, r->seq) ?:
cmp_int(l->journal_seq, r->journal_seq);
}
static int found_btree_node_cmp_pos(const void *_l, const void *_r)
@ -309,15 +330,15 @@ static int handle_overwrites(struct bch_fs *c,
} else if (n->level) {
n->overwritten = true;
} else {
struct printbuf buf = PRINTBUF;
prt_str(&buf, "overlapping btree nodes with same seq! halting\n ");
found_btree_node_to_text(&buf, c, start);
prt_str(&buf, "\n ");
found_btree_node_to_text(&buf, c, n);
bch_err(c, "%s", buf.buf);
printbuf_exit(&buf);
return -BCH_ERR_fsck_repair_unimplemented;
if (bpos_cmp(start->max_key, n->max_key) >= 0)
n->overwritten = true;
else {
n->range_updated = true;
n->min_key = bpos_successor(start->max_key);
n->range_updated = true;
bubble_up(n, end);
goto again;
}
}
}

1
fs/bcachefs/btree_node_scan_types.h
View File

@ -11,6 +11,7 @@ struct found_btree_node {
u8 level;
unsigned sectors_written;
u32 seq;
u64 journal_seq;
u64 cookie;
struct bpos min_key;