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bcachefs: bch2_trans_get_iter() no longer returns errors

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Since we now always preallocate the maximum number of iterators when we
initialize a btree transaction, getting an iterator never fails - we can
delete a fair amount of error path code.

This patch also simplifies the iterator allocation code a bit.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2020-12-01 23:11:53 -05:00 committed by Kent Overstreet
parent ec3d21a9f2
commit 3eb26d0157
12 changed files with 46 additions and 222 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

141
fs/bcachefs/btree_iter.c
View file

@ -346,7 +346,7 @@ void bch2_btree_trans_verify_locks(struct btree_trans *trans)
{
struct btree_iter *iter;
trans_for_each_iter_all(trans, iter)
trans_for_each_iter(trans, iter)
bch2_btree_iter_verify_locks(iter);
}
#else
@ -2002,110 +2002,37 @@ int bch2_trans_iter_free(struct btree_trans *trans,
return bch2_trans_iter_put(trans, iter);
}
#if 0
static int bch2_trans_realloc_iters(struct btree_trans *trans,
unsigned new_size)
noinline __cold
static void btree_trans_iter_alloc_fail(struct btree_trans *trans)
{
void *p, *new_iters, *new_updates, *new_updates2;
size_t iters_bytes;
size_t updates_bytes;
new_size = roundup_pow_of_two(new_size);
struct btree_iter *iter;
BUG_ON(new_size > BTREE_ITER_MAX);
if (new_size <= trans->size)
return 0;
BUG_ON(trans->used_mempool);
bch2_trans_unlock(trans);
iters_bytes = sizeof(struct btree_iter) * new_size;
updates_bytes = sizeof(struct btree_insert_entry) * new_size;
p = kmalloc(iters_bytes +
updates_bytes +
updates_bytes, GFP_NOFS);
if (p)
goto success;
p = mempool_alloc(&trans->c->btree_iters_pool, GFP_NOFS);
new_size = BTREE_ITER_MAX;
trans->used_mempool = true;
success:
new_iters = p; p += iters_bytes;
new_updates = p; p += updates_bytes;
new_updates2 = p; p += updates_bytes;
memcpy(new_iters, trans->iters,
sizeof(struct btree_iter) * trans->nr_iters);
memcpy(new_updates, trans->updates,
sizeof(struct btree_insert_entry) * trans->nr_updates);
memcpy(new_updates2, trans->updates2,
sizeof(struct btree_insert_entry) * trans->nr_updates2);
if (IS_ENABLED(CONFIG_BCACHEFS_DEBUG))
memset(trans->iters, POISON_FREE,
sizeof(struct btree_iter) * trans->nr_iters +
sizeof(struct btree_insert_entry) * trans->nr_iters);
kfree(trans->iters);
trans->iters = new_iters;
trans->updates = new_updates;
trans->updates2 = new_updates2;
trans->size = new_size;
if (trans->iters_live) {
trace_trans_restart_iters_realloced(trans->ip, trans->size);
return -EINTR;
}
return 0;
trans_for_each_iter(trans, iter)
pr_err("iter: btree %s pos %llu:%llu%s%s%s %ps",
bch2_btree_ids[iter->btree_id],
iter->pos.inode,
iter->pos.offset,
(trans->iters_live & (1ULL << iter->idx)) ? " live" : "",
(trans->iters_touched & (1ULL << iter->idx)) ? " touched" : "",
iter->flags & BTREE_ITER_KEEP_UNTIL_COMMIT ? " keep" : "",
(void *) iter->ip_allocated);
panic("trans iter oveflow\n");
}
#endif
static struct btree_iter *btree_trans_iter_alloc(struct btree_trans *trans)
{
unsigned idx = __ffs64(~trans->iters_linked);
unsigned idx;
if (idx < trans->nr_iters)
goto got_slot;
if (unlikely(trans->iters_linked ==
~((~0ULL << 1) << (BTREE_ITER_MAX - 1))))
btree_trans_iter_alloc_fail(trans);
if (trans->nr_iters == trans->size) {
struct btree_iter *iter;
idx = __ffs64(~trans->iters_linked);
BUG_ON(trans->size < BTREE_ITER_MAX);
trans_for_each_iter(trans, iter) {
pr_err("iter: btree %s pos %llu:%llu%s%s%s %ps",
bch2_btree_ids[iter->btree_id],
iter->pos.inode,
iter->pos.offset,
(trans->iters_live & (1ULL << iter->idx)) ? " live" : "",
(trans->iters_touched & (1ULL << iter->idx)) ? " touched" : "",
iter->flags & BTREE_ITER_KEEP_UNTIL_COMMIT ? " keep" : "",
(void *) iter->ip_allocated);
}
panic("trans iter oveflow\n");
#if 0
ret = bch2_trans_realloc_iters(trans, trans->size * 2);
if (ret)
return ERR_PTR(ret);
#endif
}
idx = trans->nr_iters++;
BUG_ON(trans->nr_iters > trans->size);
trans->iters[idx].idx = idx;
got_slot:
BUG_ON(trans->iters_linked & (1ULL << idx));
trans->iters_linked |= 1ULL << idx;
trans->iters[idx].flags = 0;
trans->iters_linked |= 1ULL << idx;
trans->iters[idx].idx = idx;
trans->iters[idx].flags = 0;
return &trans->iters[idx];
}
@ -2141,8 +2068,6 @@ static struct btree_iter *__btree_trans_get_iter(struct btree_trans *trans,
{
struct btree_iter *iter, *best = NULL;
BUG_ON(trans->nr_iters > BTREE_ITER_MAX);
trans_for_each_iter(trans, iter) {
if (btree_iter_type(iter) != (flags & BTREE_ITER_TYPE))
continue;
@ -2160,16 +2085,10 @@ static struct btree_iter *__btree_trans_get_iter(struct btree_trans *trans,
if (!best) {
iter = btree_trans_iter_alloc(trans);
if (IS_ERR(iter))
return iter;
bch2_btree_iter_init(trans, iter, btree_id, pos, flags);
} else if ((trans->iters_live & (1ULL << best->idx)) ||
(best->flags & BTREE_ITER_KEEP_UNTIL_COMMIT)) {
iter = btree_trans_iter_alloc(trans);
if (IS_ERR(iter))
return iter;
btree_iter_copy(iter, best);
} else {
iter = best;
@ -2203,9 +2122,8 @@ struct btree_iter *__bch2_trans_get_iter(struct btree_trans *trans,
struct btree_iter *iter =
__btree_trans_get_iter(trans, btree_id, pos, flags);
if (!IS_ERR(iter))
__bch2_btree_iter_set_pos(iter, pos,
btree_node_type_is_extents(btree_id));
__bch2_btree_iter_set_pos(iter, pos,
btree_node_type_is_extents(btree_id));
return iter;
}
@ -2221,7 +2139,6 @@ struct btree_iter *bch2_trans_get_node_iter(struct btree_trans *trans,
flags|BTREE_ITER_NODES);
unsigned i;
BUG_ON(IS_ERR(iter));
BUG_ON(bkey_cmp(iter->pos, pos));
iter->locks_want = locks_want;
@ -2241,9 +2158,6 @@ struct btree_iter *__bch2_trans_copy_iter(struct btree_trans *trans,
struct btree_iter *iter;
iter = btree_trans_iter_alloc(trans);
if (IS_ERR(iter))
return iter;
btree_iter_copy(iter, src);
trans->iters_live |= 1ULL << iter->idx;
@ -2318,7 +2232,6 @@ void bch2_trans_reset(struct btree_trans *trans, unsigned flags)
trans->iters_touched &= trans->iters_live;
trans->need_reset = 0;
trans->nr_updates = 0;
trans->nr_updates2 = 0;
trans->mem_top = 0;
@ -2340,9 +2253,8 @@ void bch2_trans_reset(struct btree_trans *trans, unsigned flags)
static void bch2_trans_alloc_iters(struct btree_trans *trans, struct bch_fs *c)
{
unsigned new_size = BTREE_ITER_MAX;
size_t iters_bytes = sizeof(struct btree_iter) * new_size;
size_t updates_bytes = sizeof(struct btree_insert_entry) * new_size;
size_t iters_bytes = sizeof(struct btree_iter) * BTREE_ITER_MAX;
size_t updates_bytes = sizeof(struct btree_insert_entry) * BTREE_ITER_MAX;
void *p = NULL;
BUG_ON(trans->used_mempool);
@ -2356,7 +2268,6 @@ static void bch2_trans_alloc_iters(struct btree_trans *trans, struct bch_fs *c)
trans->iters = p; p += iters_bytes;
trans->updates = p; p += updates_bytes;
trans->updates2 = p; p += updates_bytes;
trans->size = new_size;
}
void bch2_trans_init(struct btree_trans *trans, struct bch_fs *c,

32
fs/bcachefs/btree_iter.h
View file

@ -48,21 +48,16 @@ static inline int btree_iter_err(const struct btree_iter *iter)
/* Iterate over iters within a transaction: */
#define trans_for_each_iter_all(_trans, _iter) \
for (_iter = (_trans)->iters; \
_iter < (_trans)->iters + (_trans)->nr_iters; \
_iter++)
static inline struct btree_iter *
__trans_next_iter(struct btree_trans *trans, unsigned idx)
{
EBUG_ON(idx < trans->nr_iters && trans->iters[idx].idx != idx);
u64 l = trans->iters_linked >> idx;
if (!l)
return NULL;
for (; idx < trans->nr_iters; idx++)
if (trans->iters_linked & (1ULL << idx))
return &trans->iters[idx];
return NULL;
idx += __ffs64(l);
EBUG_ON(trans->iters[idx].idx != idx);
return &trans->iters[idx];
}
#define trans_for_each_iter(_trans, _iter) \
@ -240,10 +235,9 @@ static inline int bkey_err(struct bkey_s_c k)
#define for_each_btree_key(_trans, _iter, _btree_id, \
_start, _flags, _k, _ret) \
for ((_ret) = PTR_ERR_OR_ZERO((_iter) = \
bch2_trans_get_iter((_trans), (_btree_id), \
(_start), (_flags))) ?: \
PTR_ERR_OR_ZERO(((_k) = \
for ((_iter) = bch2_trans_get_iter((_trans), (_btree_id), \
(_start), (_flags)), \
(_ret) = PTR_ERR_OR_ZERO(((_k) = \
__bch2_btree_iter_peek(_iter, _flags)).k); \
!_ret && (_k).k; \
(_ret) = PTR_ERR_OR_ZERO(((_k) = \
@ -270,9 +264,7 @@ bch2_trans_get_iter(struct btree_trans *trans, enum btree_id btree_id,
{
struct btree_iter *iter =
__bch2_trans_get_iter(trans, btree_id, pos, flags);
if (!IS_ERR(iter))
iter->ip_allocated = _THIS_IP_;
iter->ip_allocated = _THIS_IP_;
return iter;
}
@ -284,10 +276,8 @@ bch2_trans_copy_iter(struct btree_trans *trans, struct btree_iter *src)
struct btree_iter *iter =
__bch2_trans_copy_iter(trans, src);
if (!IS_ERR(iter))
iter->ip_allocated = _THIS_IP_;
iter->ip_allocated = _THIS_IP_;
return iter;
}
struct btree_iter *bch2_trans_get_node_iter(struct btree_trans *,

10
fs/bcachefs/btree_key_cache.c
View file

@ -170,9 +170,6 @@ static int btree_key_cache_fill(struct btree_trans *trans,
iter = bch2_trans_get_iter(trans, ck->key.btree_id,
ck->key.pos, BTREE_ITER_SLOTS);
if (IS_ERR(iter))
return PTR_ERR(iter);
k = bch2_btree_iter_peek_slot(iter);
ret = bkey_err(k);
if (ret) {
@ -326,18 +323,11 @@ static int btree_key_cache_flush_pos(struct btree_trans *trans,
b_iter = bch2_trans_get_iter(trans, key.btree_id, key.pos,
BTREE_ITER_SLOTS|
BTREE_ITER_INTENT);
ret = PTR_ERR_OR_ZERO(b_iter);
if (ret)
goto out;
c_iter = bch2_trans_get_iter(trans, key.btree_id, key.pos,
BTREE_ITER_CACHED|
BTREE_ITER_CACHED_NOFILL|
BTREE_ITER_CACHED_NOCREATE|
BTREE_ITER_INTENT);
ret = PTR_ERR_OR_ZERO(c_iter);
if (ret)
goto out;
retry:
ret = bch2_btree_iter_traverse(c_iter);
if (ret)

11
fs/bcachefs/btree_types.h
View file

@ -357,20 +357,17 @@ struct btree_trans {
unsigned long ip;
int srcu_idx;
u64 iters_linked;
u64 iters_live;
u64 iters_touched;
u8 nr_iters;
u8 nr_updates;
u8 nr_updates2;
u8 size;
unsigned used_mempool:1;
unsigned error:1;
unsigned nounlock:1;
unsigned need_reset:1;
unsigned in_traverse_all:1;
u64 iters_linked;
u64 iters_live;
u64 iters_touched;
unsigned mem_top;
unsigned mem_bytes;
void *mem;

27
fs/bcachefs/btree_update_leaf.c
View file

@ -717,7 +717,7 @@ static void bch2_trans_update2(struct btree_trans *trans,
BUG_ON(iter->uptodate > BTREE_ITER_NEED_PEEK);
EBUG_ON(trans->nr_updates2 >= trans->nr_iters);
EBUG_ON(trans->nr_updates2 >= BTREE_ITER_MAX);
iter->flags |= BTREE_ITER_KEEP_UNTIL_COMMIT;
@ -750,8 +750,6 @@ static int extent_update_to_keys(struct btree_trans *trans,
return 0;
iter = bch2_trans_copy_iter(trans, orig_iter);
if (IS_ERR(iter))
return PTR_ERR(iter);
iter->flags |= BTREE_ITER_INTENT;
__bch2_btree_iter_set_pos(iter, insert->k.p, false);
@ -770,10 +768,6 @@ static int extent_handle_overwrites(struct btree_trans *trans,
int ret = 0;
iter = bch2_trans_get_iter(trans, btree_id, start, BTREE_ITER_INTENT);
ret = PTR_ERR_OR_ZERO(iter);
if (ret)
return ret;
k = bch2_btree_iter_peek_with_updates(iter);
while (k.k && !(ret = bkey_err(k))) {
@ -782,8 +776,6 @@ static int extent_handle_overwrites(struct btree_trans *trans,
if (bkey_cmp(bkey_start_pos(k.k), start) < 0) {
update_iter = bch2_trans_copy_iter(trans, iter);
if ((ret = PTR_ERR_OR_ZERO(update_iter)))
goto err;
update = bch2_trans_kmalloc(trans, bkey_bytes(k.k));
if ((ret = PTR_ERR_OR_ZERO(update)))
@ -799,8 +791,6 @@ static int extent_handle_overwrites(struct btree_trans *trans,
if (bkey_cmp(k.k->p, end) > 0) {
update_iter = bch2_trans_copy_iter(trans, iter);
if ((ret = PTR_ERR_OR_ZERO(update_iter)))
goto err;
update = bch2_trans_kmalloc(trans, bkey_bytes(k.k));
if ((ret = PTR_ERR_OR_ZERO(update)))
@ -814,8 +804,6 @@ static int extent_handle_overwrites(struct btree_trans *trans,
bch2_trans_iter_put(trans, update_iter);
} else {
update_iter = bch2_trans_copy_iter(trans, iter);
if ((ret = PTR_ERR_OR_ZERO(update_iter)))
goto err;
update = bch2_trans_kmalloc(trans, sizeof(struct bkey));
if ((ret = PTR_ERR_OR_ZERO(update)))
@ -847,8 +835,6 @@ int __bch2_trans_commit(struct btree_trans *trans)
unsigned u64s;
int ret = 0;
BUG_ON(trans->need_reset);
if (!trans->nr_updates)
goto out_noupdates;
@ -1041,10 +1027,6 @@ int bch2_trans_update(struct btree_trans *trans, struct btree_iter *iter,
*/
if (trans->iters_live & (1ULL << i->iter->idx)) {
i->iter = bch2_trans_copy_iter(trans, i->iter);
if (IS_ERR(i->iter)) {
trans->need_reset = true;
return PTR_ERR(i->iter);
}
i->iter->flags |= BTREE_ITER_KEEP_UNTIL_COMMIT;
bch2_trans_iter_put(trans, i->iter);
@ -1054,7 +1036,7 @@ int bch2_trans_update(struct btree_trans *trans, struct btree_iter *iter,
bch2_btree_iter_set_pos(i->iter, n.k->k.p);
}
EBUG_ON(trans->nr_updates >= trans->nr_iters);
EBUG_ON(trans->nr_updates >= BTREE_ITER_MAX);
array_insert_item(trans->updates, trans->nr_updates,
i - trans->updates, n);
@ -1069,8 +1051,6 @@ int __bch2_btree_insert(struct btree_trans *trans,
iter = bch2_trans_get_iter(trans, id, bkey_start_pos(&k->k),
BTREE_ITER_INTENT);
if (IS_ERR(iter))
return PTR_ERR(iter);
ret = bch2_btree_iter_traverse(iter) ?:
bch2_trans_update(trans, iter, k, 0);
@ -1117,9 +1097,6 @@ int bch2_btree_delete_range_trans(struct btree_trans *trans, enum btree_id id,
int ret = 0;
iter = bch2_trans_get_iter(trans, id, start, BTREE_ITER_INTENT);
ret = PTR_ERR_OR_ZERO(iter);
if (ret)
return ret;
retry:
while ((k = bch2_btree_iter_peek(iter)).k &&
!(ret = bkey_err(k)) &&

6
fs/bcachefs/buckets.c
View file

@ -1575,9 +1575,6 @@ static int trans_get_key(struct btree_trans *trans,
*iter = bch2_trans_get_iter(trans, btree_id, pos,
flags|BTREE_ITER_INTENT);
if (IS_ERR(*iter))
return PTR_ERR(*iter);
*k = __bch2_btree_iter_peek(*iter, flags);
ret = bkey_err(*k);
if (ret)
@ -1605,9 +1602,6 @@ static int bch2_trans_start_alloc_update(struct btree_trans *trans, struct btree
BTREE_ITER_CACHED|
BTREE_ITER_CACHED_NOFILL|
BTREE_ITER_INTENT);
if (IS_ERR(iter))
return PTR_ERR(iter);
ret = bch2_btree_iter_traverse(iter);
if (ret) {
bch2_trans_iter_put(trans, iter);

3
fs/bcachefs/fs-io.c
View file

@ -2489,10 +2489,7 @@ static long bchfs_fcollapse_finsert(struct bch_inode_info *inode,
src = bch2_trans_get_iter(&trans, BTREE_ID_EXTENTS,
POS(inode->v.i_ino, src_start >> 9),
BTREE_ITER_INTENT);
BUG_ON(IS_ERR_OR_NULL(src));
dst = bch2_trans_copy_iter(&trans, src);
BUG_ON(IS_ERR_OR_NULL(dst));
while (1) {
struct disk_reservation disk_res =

8
fs/bcachefs/fsck.c
View file

@ -230,7 +230,6 @@ static int hash_check_duplicates(struct btree_trans *trans,
return 0;
iter = bch2_trans_copy_iter(trans, h->chain);
BUG_ON(IS_ERR(iter));
for_each_btree_key_continue(iter, 0, k2, ret) {
if (bkey_cmp(k2.k->p, k.k->p) >= 0)
@ -265,10 +264,8 @@ static void hash_set_chain_start(struct btree_trans *trans,
hash_stop_chain(trans, h);
if (!hole) {
if (!h->chain) {
if (!h->chain)
h->chain = bch2_trans_copy_iter(trans, k_iter);
BUG_ON(IS_ERR(h->chain));
}
h->chain_end = k.k->p.offset;
}
@ -440,9 +437,6 @@ static int bch2_fix_overlapping_extent(struct btree_trans *trans,
bch2_cut_front(cut_at, u);
u_iter = bch2_trans_copy_iter(trans, iter);
ret = PTR_ERR_OR_ZERO(u_iter);
if (ret)
return ret;
/*
* We don't want to go through the

6
fs/bcachefs/inode.c
View file

@ -302,9 +302,6 @@ struct btree_iter *bch2_inode_peek(struct btree_trans *trans,
iter = bch2_trans_get_iter(trans, BTREE_ID_INODES, POS(0, inum),
BTREE_ITER_CACHED|flags);
if (IS_ERR(iter))
return iter;
k = bch2_btree_iter_peek_cached(iter);
ret = bkey_err(k);
if (ret)
@ -640,9 +637,6 @@ int bch2_inode_find_by_inum_trans(struct btree_trans *trans, u64 inode_nr,
iter = bch2_trans_get_iter(trans, BTREE_ID_INODES,
POS(0, inode_nr), BTREE_ITER_CACHED);
if (IS_ERR(iter))
return PTR_ERR(iter);
k = bch2_btree_iter_peek_cached(iter);
ret = bkey_err(k);
if (ret)

9
fs/bcachefs/io.c
View file

@ -207,8 +207,6 @@ static int sum_sector_overwrites(struct btree_trans *trans,
*delta = 0;
iter = bch2_trans_copy_iter(trans, extent_iter);
if (IS_ERR(iter))
return PTR_ERR(iter);
for_each_btree_key_continue(iter, BTREE_ITER_SLOTS, old, ret) {
if (!may_allocate &&
@ -1781,9 +1779,6 @@ static int __bch2_rbio_narrow_crcs(struct btree_trans *trans,
iter = bch2_trans_get_iter(trans, BTREE_ID_EXTENTS, rbio->pos,
BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
if ((ret = PTR_ERR_OR_ZERO(iter)))
goto out;
k = bch2_btree_iter_peek_slot(iter);
if ((ret = bkey_err(k)))
goto out;
@ -1991,10 +1986,6 @@ int __bch2_read_indirect_extent(struct btree_trans *trans,
iter = bch2_trans_get_iter(trans, BTREE_ID_REFLINK,
POS(0, reflink_offset),
BTREE_ITER_SLOTS);
ret = PTR_ERR_OR_ZERO(iter);
if (ret)
return ret;
k = bch2_btree_iter_peek_slot(iter);
ret = bkey_err(k);
if (ret)

8
fs/bcachefs/recovery.c
View file

@ -443,9 +443,6 @@ static int bch2_extent_replay_key(struct bch_fs *c, enum btree_id btree_id,
bch2_cut_back(atomic_end, split);
split_iter = bch2_trans_copy_iter(&trans, iter);
ret = PTR_ERR_OR_ZERO(split_iter);
if (ret)
goto err;
/*
* It's important that we don't go through the
@ -502,8 +499,6 @@ static int __bch2_journal_replay_key(struct btree_trans *trans,
iter = bch2_trans_get_node_iter(trans, id, k->k.p,
BTREE_MAX_DEPTH, level,
BTREE_ITER_INTENT);
if (IS_ERR(iter))
return PTR_ERR(iter);
/*
* iter->flags & BTREE_ITER_IS_EXTENTS triggers the update path to run
@ -538,8 +533,7 @@ static int __bch2_alloc_replay_key(struct btree_trans *trans, struct bkey_i *k)
BTREE_ITER_CACHED|
BTREE_ITER_CACHED_NOFILL|
BTREE_ITER_INTENT);
ret = PTR_ERR_OR_ZERO(iter) ?:
bch2_trans_update(trans, iter, k, BTREE_TRIGGER_NORUN);
ret = bch2_trans_update(trans, iter, k, BTREE_TRIGGER_NORUN);
bch2_trans_iter_put(trans, iter);
return ret;
}

7
fs/bcachefs/str_hash.h
View file

@ -205,8 +205,6 @@ int bch2_hash_needs_whiteout(struct btree_trans *trans,
int ret;
iter = bch2_trans_copy_iter(trans, start);
if (IS_ERR(iter))
return PTR_ERR(iter);
bch2_btree_iter_next_slot(iter);
@ -253,11 +251,8 @@ int bch2_hash_set(struct btree_trans *trans,
}
if (!slot &&
!(flags & BCH_HASH_SET_MUST_REPLACE)) {
!(flags & BCH_HASH_SET_MUST_REPLACE))
slot = bch2_trans_copy_iter(trans, iter);
if (IS_ERR(slot))
return PTR_ERR(slot);
}
if (k.k->type != KEY_TYPE_whiteout)
goto not_found;