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| author | Kent Overstreet <kent.overstreet@linux.dev> | 2023-07-10 18:17:56 +0300 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2023-10-23 00:10:06 +0300 |
| commit | 01e691e830edae9a145eeb70f8983223d606e2ca (patch) | |
| tree | 278d45c4b81de206eb65084fda747c7d7a40230d /fs/bcachefs/btree_update_interior.c | |
| parent | ba8eeae8eee0aae03eb6be0372519b72057d312c (diff) | |
| download | linux-01e691e830edae9a145eeb70f8983223d606e2ca.tar.xz | |
bcachefs: Fix a write buffer flush deadlock
We're not supposed to block if BTREE_INSERT_JOURNAL_RECLAIM && watermark
!= BCH_WATERMARK_reclaim.
This should really be a separate BTREE_INSERT_NONBLOCK flag - add some
comments to that effect, it's not important for this patch.
btree write buffer flush depends on this behaviour though - the first
loop tries to flush sequentially, which doesn't free up space in the
journal optimally. If that can't proceed we bail out and flush in
journal order - that won't work if we're blocked instead of returning an
error.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'fs/bcachefs/btree_update_interior.c')
| -rw-r--r-- | fs/bcachefs/btree_update_interior.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/bcachefs/btree_update_interior.c b/fs/bcachefs/btree_update_interior.c index 5592feff79d1..3659b2c08109 100644 --- a/fs/bcachefs/btree_update_interior.c +++ b/fs/bcachefs/btree_update_interior.c @@ -1158,6 +1158,17 @@ bch2_btree_update_start(struct btree_trans *trans, struct btree_path *path, bch2_err_matches(ret, ENOMEM)) { struct closure cl; + /* + * XXX: this should probably be a separate BTREE_INSERT_NONBLOCK + * flag + */ + if (bch2_err_matches(ret, ENOSPC) && + (flags & BTREE_INSERT_JOURNAL_RECLAIM) && + watermark != BCH_WATERMARK_reclaim) { + ret = -BCH_ERR_journal_reclaim_would_deadlock; + goto err; + } + closure_init_stack(&cl); do { |