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bcachefs; Fix deadlock in bch2_btree_update_start()

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BCH_TRANS_COMMIT_journal_reclaim with watermark != BCH_WATERMARK_reclaim
means nonblocking, and we need the journal_res_get() in
btree_update_start() to respect that.

In a future refactoring we'll be deleting
BCH_TRANS_COMMIT_journal_reclaim and replacing it with an explicit
BCH_TRANS_COMMIT_nonblocking.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-03-18 21:36:08 -04:00
parent b38114dde0
commit c502b5b878
1 changed files with 9 additions and 4 deletions
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13
fs/bcachefs/btree_update_interior.c
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@ -1067,13 +1067,18 @@ bch2_btree_update_start(struct btree_trans *trans, struct btree_path *path,
flags &= ~BCH_WATERMARK_MASK;
flags |= watermark;
if (!(flags & BCH_TRANS_COMMIT_journal_reclaim) &&
watermark < c->journal.watermark) {
if (watermark < c->journal.watermark) {
struct journal_res res = { 0 };
unsigned journal_flags = watermark|JOURNAL_RES_GET_CHECK;
if ((flags & BCH_TRANS_COMMIT_journal_reclaim) &&
watermark != BCH_WATERMARK_reclaim)
journal_flags |= JOURNAL_RES_GET_NONBLOCK;
ret = drop_locks_do(trans,
bch2_journal_res_get(&c->journal, &res, 1,
watermark|JOURNAL_RES_GET_CHECK));
bch2_journal_res_get(&c->journal, &res, 1, journal_flags));
if (bch2_err_matches(ret, BCH_ERR_operation_blocked))
ret = -BCH_ERR_journal_reclaim_would_deadlock;
if (ret)
return ERR_PTR(ret);
}