@@ -705,14 +705,14 @@ static void search_free(struct closure *cl)
{
struct search *s = container_of(cl, struct search, cl);
- atomic_dec(&s->d->c->search_inflight);
+ atomic_dec(&s->iop.c->search_inflight);
if (s->iop.bio)
bio_put(s->iop.bio);
bio_complete(s);
closure_debug_destroy(cl);
- mempool_free(s, &s->d->c->search);
+ mempool_free(s, &s->iop.c->search);
}
static inline struct search *search_alloc(struct bio *bio,
@@ -755,13 +755,13 @@ static void cached_dev_bio_complete(struct closure *cl)
struct search *s = container_of(cl, struct search, cl);
struct cached_dev *dc = container_of(s->d, struct cached_dev, disk);
- search_free(cl);
cached_dev_put(dc);
+ search_free(cl);
}
/* Process reads */
-static void cached_dev_cache_miss_done(struct closure *cl)
+static void cached_dev_read_error_done(struct closure *cl)
{
struct search *s = container_of(cl, struct search, cl);
@@ -799,7 +799,22 @@ static void cached_dev_read_error(struct closure *cl)
closure_bio_submit(s->iop.c, bio, cl);
}
- continue_at(cl, cached_dev_cache_miss_done, NULL);
+ continue_at(cl, cached_dev_read_error_done, NULL);
+}
+
+static void cached_dev_cache_miss_done(struct closure *cl)
+{
+ struct search *s = container_of(cl, struct search, cl);
+ struct bcache_device *d = s->d;
+
+ if (s->iop.replace_collision)
+ bch_mark_cache_miss_collision(s->iop.c, s->d);
+
+ if (s->iop.bio)
+ bio_free_pages(s->iop.bio);
+
+ cached_dev_bio_complete(cl);
+ closure_put(&d->cl);
}
static void cached_dev_read_done(struct closure *cl)
@@ -832,6 +847,7 @@ static void cached_dev_read_done(struct closure *cl)
if (verify(dc) && s->recoverable && !s->read_dirty_data)
bch_data_verify(dc, s->orig_bio);
+ closure_get(&dc->disk.cl);
bio_complete(s);
if (s->iop.bio &&
The bio from upper layer is considered completed when bio_complete() returns. In most scenarios bio_complete() is called in search_free(), but when read miss happens, the bio_compete() is called when backing device reading completed, while the struct search is still in use until cache inserting finished. If someone stops the bcache device just then, the device may be closed and released, but after cache inserting finished the struct search will access a freed struct cached_dev. This patch add the reference of bcache device before bio_complete() when read miss happens, and put it after the search is not used. Signed-off-by: Guoju Fang <fangguoju@gmail.com> --- drivers/md/bcache/request.c | 26 +++++++++++++++++++++----- 1 file changed, 21 insertions(+), 5 deletions(-)