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| author | Kent Overstreet <kent.overstreet@gmail.com> | 2022-03-05 01:16:04 +0100 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2023-10-22 23:09:26 +0200 |
| commit | 3098553776a16c08446c408005090423d62e6b54 (patch) | |
| tree | 17cc317918e2fb51dd540d86650510928965cb5e /fs/bcachefs/debug.c | |
| parent | bcachefs: Refactor bch2_btree_node_mem_alloc() (diff) | |
| download | linux-3098553776a16c08446c408005090423d62e6b54.tar.xz linux-3098553776a16c08446c408005090423d62e6b54.zip | |
bcachefs: Fix usage of six lock's percpu mode
Six locks have a percpu mode, which we use for interior btree nodes, as
well as btree key cache keys for the subvolumes btree. We've been
switching locks back and forth between percpu and non percpu mode as
needed, but it turns out this is racy - when we're reusing an existing
node, other threads could be attempting to lock it while we're switching
it between modes.
This patch fixes this by never switching 'struct btree' between the two
modes, and instead segragating them between two different freed lists.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'fs/bcachefs/debug.c')
| -rw-r--r-- | fs/bcachefs/debug.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/bcachefs/debug.c b/fs/bcachefs/debug.c index 1fff03d301a9..457fcee7d8e1 100644 --- a/fs/bcachefs/debug.c +++ b/fs/bcachefs/debug.c @@ -443,6 +443,11 @@ static void bch2_cached_btree_node_to_text(struct printbuf *out, struct bch_fs * bch2_flags_to_text(out, bch2_btree_node_flags, b->flags); pr_newline(out); + pr_buf(out, "pcpu read locks: "); + pr_tab(out); + pr_buf(out, "%u", b->c.lock.readers != NULL); + pr_newline(out); + pr_buf(out, "written:"); pr_tab(out); pr_buf(out, "%u", b->written); |