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bcachefs: Fix write buffer flushing from open journal entry

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When flushing the btree write buffer, we pull write buffer keys directly
from the journal instead of letting the journal write path copy them to
the write buffer.

When flushing from the currently open journal buffer, we have to block
new reservations and wait for outstanding reservations to complete.

Recheck the reservation state after blocking new reservations:
previously, we were checking the reservation count from before calling
__journal_block().

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2025-07-21 23:41:50 -04:00
parent eef9170700
commit 1831840c2b
1 changed files with 1 additions and 0 deletions
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fs/bcachefs/journal.c
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@ -1082,6 +1082,7 @@ static struct journal_buf *__bch2_next_write_buffer_flush_journal_buf(struct jou
if (open && !*blocked) {
__bch2_journal_block(j);
s.v = atomic64_read_acquire(&j->reservations.counter);
*blocked = true;
}