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bcachefs: Journal space calculation fix

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When devices have different bucket sizes, we may accumulate a journal
write that doesn't fit on some of our devices - previously, we'd
underflow when calculating space on that device and then everything
would get weird.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
This commit is contained in:
Kent Overstreet 2021-05-31 00:13:39 -04:00 committed by Kent Overstreet
parent 649d9a4dfc
commit d7fc453bdb
1 changed files with 4 additions and 0 deletions
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4
fs/bcachefs/journal_reclaim.c
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@ -93,6 +93,10 @@ journal_dev_space_available(struct journal *j, struct bch_dev *ca,
* until we write it out - thus, account for it here:
*/
while ((unwritten = get_unwritten_sectors(j, &idx))) {
/* entry won't fit on this device, skip: */
if (unwritten > ca->mi.bucket_size)
continue;
if (unwritten >= sectors) {
if (!buckets) {
sectors = 0;