bcachefs: Allow shorter JSET_ENTRY_dev_usage entries

If the last entry(ies) would be all zeros, there's no need to write them
out - the read path already handles that.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

diff --git a/fs/bcachefs/journal_io.c b/fs/bcachefs/journal_io.c
index a7d0865..e797d63 100644 (file)
--- a/fs/bcachefs/journal_io.c
+++ b/fs/bcachefs/journal_io.c
@@ -449,7 +449,7 @@ static int journal_entry_validate_dev_usage(struct bch_fs *c,
        struct jset_entry_dev_usage *u =
                container_of(entry, struct jset_entry_dev_usage, entry);
        unsigned bytes = jset_u64s(le16_to_cpu(entry->u64s)) * sizeof(u64);
-       unsigned expected = sizeof(*u) + sizeof(u->d[0]) * 7; /* Current value of BCH_DATA_NR */
+       unsigned expected = sizeof(*u);
        unsigned dev;
        int ret = 0;