bcachefs: bch2_dev_get_ioref() checks for device not present

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Author: Kent Overstreet

fs/bcachefs/alloc_background.c

@@ -1679,7 +1679,7 @@ static int bch2_discard_one_bucket(struct btree_trans *trans,
 
 	struct bch_dev *ca = s->ca && s->ca->dev_idx == pos.inode
 		? s->ca
-		: bch2_dev_get_ioref2(c, pos.inode, WRITE);
+		: bch2_dev_get_ioref(c, pos.inode, WRITE);
 	if (!ca) {
 		bch2_btree_iter_set_pos(need_discard_iter, POS(pos.inode + 1, 0));
 		return 0;
@@ -1860,7 +1860,7 @@ static void bch2_do_discards_fast_work(struct work_struct *work)
 			if (i->snapshot)
 				continue;
 
-			ca = bch2_dev_get_ioref2(c, i->inode, WRITE);
+			ca = bch2_dev_get_ioref(c, i->inode, WRITE);
 			if (!ca) {
 				darray_remove_item(&c->discard_buckets_in_flight, i);
 				continue;

fs/bcachefs/backpointers.c

@@ -486,7 +486,7 @@ static int check_extent_checksum(struct btree_trans *trans,
 
 	bytes = p.crc.compressed_size << 9;
 
-	struct bch_dev *ca = bch2_dev_get_ioref2(c, dev, READ);
+	struct bch_dev *ca = bch2_dev_get_ioref(c, dev, READ);
 	if (!ca)
 		return false;
 

fs/bcachefs/btree_io.c

@@ -1308,7 +1308,7 @@ static void btree_node_read_work(struct work_struct *work)
 	while (1) {
 		retry = true;
 		bch_info(c, "retrying read");
-		ca = bch2_dev_get_ioref2(c, rb->pick.ptr.dev, READ);
+		ca = bch2_dev_get_ioref(c, rb->pick.ptr.dev, READ);
 		rb->have_ioref		= ca != NULL;
 		bio_reset(bio, NULL, REQ_OP_READ|REQ_SYNC|REQ_META);
 		bio->bi_iter.bi_sector	= rb->pick.ptr.offset;
@@ -1618,7 +1618,7 @@ static int btree_node_read_all_replicas(struct bch_fs *c, struct btree *b, bool
 
 	i = 0;
 	bkey_for_each_ptr_decode(k.k, ptrs, pick, entry) {
-		struct bch_dev *ca = bch2_dev_get_ioref2(c, pick.ptr.dev, READ);
+		struct bch_dev *ca = bch2_dev_get_ioref(c, pick.ptr.dev, READ);
 		struct btree_read_bio *rb =
 			container_of(ra->bio[i], struct btree_read_bio, bio);
 		rb->c			= c;
@@ -1695,7 +1695,7 @@ void bch2_btree_node_read(struct btree_trans *trans, struct btree *b,
 		return;
 	}
 
-	ca = bch2_dev_get_ioref2(c, pick.ptr.dev, READ);
+	ca = bch2_dev_get_ioref(c, pick.ptr.dev, READ);
 
 	bio = bio_alloc_bioset(NULL,
 			       buf_pages(b->data, btree_buf_bytes(b)),

fs/bcachefs/debug.c

@@ -40,7 +40,7 @@ static bool bch2_btree_verify_replica(struct bch_fs *c, struct btree *b,
 	struct bio *bio;
 	bool failed = false, saw_error = false;
 
-	struct bch_dev *ca = bch2_dev_get_ioref2(c, pick.ptr.dev, READ);
+	struct bch_dev *ca = bch2_dev_get_ioref(c, pick.ptr.dev, READ);
 	if (!ca)
 		return false;
 
@@ -194,7 +194,7 @@ void bch2_btree_node_ondisk_to_text(struct printbuf *out, struct bch_fs *c,
 		return;
 	}
 
-	ca = bch2_dev_get_ioref2(c, pick.ptr.dev, READ);
+	ca = bch2_dev_get_ioref(c, pick.ptr.dev, READ);
 	if (!ca) {
 		prt_printf(out, "error getting device to read from: not online\n");
 		return;

fs/bcachefs/ec.c

@@ -732,12 +732,17 @@ static void ec_block_io(struct bch_fs *c, struct ec_stripe_buf *buf,
 	struct bch_stripe *v = &bkey_i_to_stripe(&buf->key)->v;
 	unsigned offset = 0, bytes = buf->size << 9;
 	struct bch_extent_ptr *ptr = &v->ptrs[idx];
-	struct bch_dev *ca = bch2_dev_bkey_exists(c, ptr->dev);
 	enum bch_data_type data_type = idx < v->nr_blocks - v->nr_redundant
 		? BCH_DATA_user
 		: BCH_DATA_parity;
 	int rw = op_is_write(opf);
 
+	struct bch_dev *ca = bch2_dev_get_ioref(c, ptr->dev, rw);
+	if (!ca) {
+		clear_bit(idx, buf->valid);
+		return;
+	}
+
 	if (dev_ptr_stale(ca, ptr)) {
 		bch_err_ratelimited(c,
 				    "error %s stripe: stale pointer",
@@ -746,10 +751,6 @@ static void ec_block_io(struct bch_fs *c, struct ec_stripe_buf *buf,
 		return;
 	}
 
-	if (!bch2_dev_get_ioref(ca, rw)) {
-		clear_bit(idx, buf->valid);
-		return;
-	}
 
 	this_cpu_add(ca->io_done->sectors[rw][data_type], buf->size);
 
@@ -1354,20 +1355,18 @@ static void zero_out_rest_of_ec_bucket(struct bch_fs *c,
 				       unsigned block,
 				       struct open_bucket *ob)
 {
-	struct bch_dev *ca = bch2_dev_bkey_exists(c, ob->dev);
-	unsigned offset = ca->mi.bucket_size - ob->sectors_free;
-	int ret;
-
-	if (!bch2_dev_get_ioref(ca, WRITE)) {
+	struct bch_dev *ca = bch2_dev_get_ioref(c, ob->dev, WRITE);
+	if (!ca) {
 		s->err = -BCH_ERR_erofs_no_writes;
 		return;
 	}
 
+	unsigned offset = ca->mi.bucket_size - ob->sectors_free;
 	memset(s->new_stripe.data[block] + (offset << 9),
 	       0,
 	       ob->sectors_free << 9);
 
-	ret = blkdev_issue_zeroout(ca->disk_sb.bdev,
+	int ret = blkdev_issue_zeroout(ca->disk_sb.bdev,
 			ob->bucket * ca->mi.bucket_size + offset,
 			ob->sectors_free,
 			GFP_KERNEL, 0);

fs/bcachefs/io_read.c

@@ -830,7 +830,7 @@ int __bch2_read_extent(struct btree_trans *trans, struct bch_read_bio *orig,
 		goto err;
 	}
 
-	struct bch_dev *ca = bch2_dev_get_ioref2(c, pick.ptr.dev, READ);
+	struct bch_dev *ca = bch2_dev_get_ioref(c, pick.ptr.dev, READ);
 
 	/*
 	 * Stale dirty pointers are treated as IO errors, but @failed isn't

fs/bcachefs/io_write.c

@@ -409,7 +409,7 @@ void bch2_submit_wbio_replicas(struct bch_write_bio *wbio, struct bch_fs *c,
 	bkey_for_each_ptr(ptrs, ptr) {
 		struct bch_dev *ca = nocow
 			? bch2_dev_have_ref(c, ptr->dev)
-			: bch2_dev_get_ioref2(c, ptr->dev, type == BCH_DATA_btree ? READ : WRITE);
+			: bch2_dev_get_ioref(c, ptr->dev, type == BCH_DATA_btree ? READ : WRITE);
 
 		if (to_entry(ptr + 1) < ptrs.end) {
 			n = to_wbio(bio_alloc_clone(NULL, &wbio->bio, GFP_NOFS, &c->replica_set));
@@ -1265,7 +1265,7 @@ static void bch2_nocow_write(struct bch_write_op *op)
 		/* Get iorefs before dropping btree locks: */
 		struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
 		bkey_for_each_ptr(ptrs, ptr) {
-			struct bch_dev *ca = bch2_dev_get_ioref2(c, ptr->dev, WRITE);
+			struct bch_dev *ca = bch2_dev_get_ioref(c, ptr->dev, WRITE);
 			if (unlikely(!ca))
 				goto err_get_ioref;
 

fs/bcachefs/journal_io.c

@@ -1722,7 +1722,7 @@ static CLOSURE_CALLBACK(journal_write_submit)
 	unsigned sectors = vstruct_sectors(w->data, c->block_bits);
 
 	extent_for_each_ptr(bkey_i_to_s_extent(&w->key), ptr) {
-		struct bch_dev *ca = bch2_dev_get_ioref2(c, ptr->dev, WRITE);
+		struct bch_dev *ca = bch2_dev_get_ioref(c, ptr->dev, WRITE);
 		if (!ca) {
 			/* XXX: fix this */
 			bch_err(c, "missing device for journal write\n");

fs/bcachefs/sb-members.h

@@ -29,19 +29,6 @@ static inline bool bch2_dev_is_readable(struct bch_dev *ca)
 		ca->mi.state != BCH_MEMBER_STATE_failed;
 }
 
-static inline bool bch2_dev_get_ioref(struct bch_dev *ca, int rw)
-{
-	if (!percpu_ref_tryget(&ca->io_ref))
-		return false;
-
-	if (ca->mi.state == BCH_MEMBER_STATE_rw ||
-	    (ca->mi.state == BCH_MEMBER_STATE_ro && rw == READ))
-		return true;
-
-	percpu_ref_put(&ca->io_ref);
-	return false;
-}
-
 static inline unsigned dev_mask_nr(const struct bch_devs_mask *devs)
 {
 	return bitmap_weight(devs->d, BCH_SB_MEMBERS_MAX);
@@ -285,7 +272,7 @@ static inline struct bch_dev *bch2_dev_iterate(struct bch_fs *c, struct bch_dev
 	return bch2_dev_tryget(c, dev_idx);
 }
 
-static inline struct bch_dev *bch2_dev_get_ioref2(struct bch_fs *c, unsigned dev, int rw)
+static inline struct bch_dev *bch2_dev_get_ioref(struct bch_fs *c, unsigned dev, int rw)
 {
 	rcu_read_lock();
 	struct bch_dev *ca = bch2_dev_rcu(c, dev);