+static inline loff_t folio_end_pos(struct folio *folio)
+{
+ return folio_pos(folio) + folio_size(folio);
+}
+
+static inline size_t folio_sectors(struct folio *folio)
+{
+ return PAGE_SECTORS << folio_order(folio);
+}
+
+static inline loff_t folio_sector(struct folio *folio)
+{
+ return folio_pos(folio) >> 9;
+}
+
+static inline loff_t folio_end_sector(struct folio *folio)
+{
+ return folio_end_pos(folio) >> 9;
+}
+
+typedef DARRAY(struct folio *) folios;
+
+static int filemap_get_contig_folios_d(struct address_space *mapping,
+ loff_t start, loff_t end,
+ int fgp_flags, gfp_t gfp,
+ folios *folios)
+{
+ struct folio *f;
+ loff_t pos = start;
+ int ret = 0;
+
+ while (pos < end) {
+ if ((u64) pos >= (u64) start + (1ULL << 20))
+ fgp_flags &= ~FGP_CREAT;
+
+ ret = darray_make_room_gfp(folios, 1, gfp & GFP_KERNEL);
+ if (ret)
+ break;
+
+ f = __filemap_get_folio(mapping, pos >> PAGE_SHIFT, fgp_flags, gfp);
+ if (!f)
+ break;
+
+ BUG_ON(folios->nr && folio_pos(f) != pos);
+
+ pos = folio_end_pos(f);
+ darray_push(folios, f);
+ }
+
+ if (!folios->nr && !ret && (fgp_flags & FGP_CREAT))
+ ret = -ENOMEM;
+
+ return folios->nr ? 0 : ret;
+}
+
+struct nocow_flush {
+ struct closure *cl;
+ struct bch_dev *ca;
+ struct bio bio;
+};
+
+static void nocow_flush_endio(struct bio *_bio)
+{
+
+ struct nocow_flush *bio = container_of(_bio, struct nocow_flush, bio);
+
+ closure_put(bio->cl);
+ percpu_ref_put(&bio->ca->io_ref);
+ bio_put(&bio->bio);
+}
+
+static void bch2_inode_flush_nocow_writes_async(struct bch_fs *c,
+ struct bch_inode_info *inode,
+ struct closure *cl)
+{
+ struct nocow_flush *bio;
+ struct bch_dev *ca;
+ struct bch_devs_mask devs;
+ unsigned dev;
+
+ dev = find_first_bit(inode->ei_devs_need_flush.d, BCH_SB_MEMBERS_MAX);
+ if (dev == BCH_SB_MEMBERS_MAX)
+ return;
+
+ devs = inode->ei_devs_need_flush;
+ memset(&inode->ei_devs_need_flush, 0, sizeof(inode->ei_devs_need_flush));
+
+ for_each_set_bit(dev, devs.d, BCH_SB_MEMBERS_MAX) {
+ rcu_read_lock();
+ ca = rcu_dereference(c->devs[dev]);
+ if (ca && !percpu_ref_tryget(&ca->io_ref))
+ ca = NULL;
+ rcu_read_unlock();
+
+ if (!ca)
+ continue;
+
+ bio = container_of(bio_alloc_bioset(ca->disk_sb.bdev, 0,
+ REQ_OP_FLUSH,
+ GFP_KERNEL,
+ &c->nocow_flush_bioset),
+ struct nocow_flush, bio);
+ bio->cl = cl;
+ bio->ca = ca;
+ bio->bio.bi_end_io = nocow_flush_endio;
+ closure_bio_submit(&bio->bio, cl);
+ }
+}
+
+static int bch2_inode_flush_nocow_writes(struct bch_fs *c,
+ struct bch_inode_info *inode)
+{
+ struct closure cl;
+
+ closure_init_stack(&cl);
+ bch2_inode_flush_nocow_writes_async(c, inode, &cl);
+ closure_sync(&cl);
+
+ return 0;
+}
+