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bcachefs: Don't issue discards when in nochanges mode

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When the nochanges option is selected, we're supposed to never issue
writes. Unfortunately, it seems discards were missed when implemnting
this, leading to some painful filesystem corruption.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
This commit is contained in:
Kent Overstreet
2022-02-21 05:05:29 -05:00
committed by Kent Overstreet
parent 8ccf4dff09
commit 3117db99f3
2 changed files with 4 additions and 2 deletions
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3
fs/bcachefs/alloc_background.c
View File

@@ -801,7 +801,8 @@ static int push_invalidated_bucket(struct bch_fs *c, struct bch_dev *ca, u64 b)
static void discard_one_bucket(struct bch_fs *c, struct bch_dev *ca, u64 b)
{
if (ca->mi.discard &&
if (!c->opts.nochanges &&
ca->mi.discard &&
bdev_max_discard_sectors(ca->disk_sb.bdev))
blkdev_issue_discard(ca->disk_sb.bdev, bucket_to_sector(ca, b),
ca->mi.bucket_size, GFP_NOFS);

3
fs/bcachefs/journal_reclaim.c
View File

@@ -286,7 +286,8 @@ void bch2_journal_do_discards(struct journal *j)
struct journal_device *ja = &ca->journal;
while (should_discard_bucket(j, ja)) {
if (ca->mi.discard &&
if (!c->opts.nochanges &&
ca->mi.discard &&
bdev_max_discard_sectors(ca->disk_sb.bdev))
blkdev_issue_discard(ca->disk_sb.bdev,
bucket_to_sector(ca,