bcachefs: Initial commit

Initially forked from drivers/md/bcache, bcachefs is a new copy-on-write
filesystem with every feature you could possibly want.

Website: https://bcachefs.org

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

1 files changed, 144 insertions, 0 deletions

diff --git a/fs/bcachefs/io.h b/fs/bcachefs/io.h
new file mode 100644
index 000000000000..f814226a5196
--- /dev/null
+++ b/fs/bcachefs/io.h
@@ -0,0 +1,144 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BCACHEFS_IO_H
+#define _BCACHEFS_IO_H
+
+#include "alloc.h"
+#include "checksum.h"
+#include "io_types.h"
+
+#define to_wbio(_bio)			\
+	container_of((_bio), struct bch_write_bio, bio)
+
+#define to_rbio(_bio)			\
+	container_of((_bio), struct bch_read_bio, bio)
+
+void bch2_bio_free_pages_pool(struct bch_fs *, struct bio *);
+void bch2_bio_alloc_pages_pool(struct bch_fs *, struct bio *, size_t);
+void bch2_bio_alloc_more_pages_pool(struct bch_fs *, struct bio *, size_t);
+
+#ifndef CONFIG_BCACHEFS_NO_LATENCY_ACCT
+void bch2_latency_acct(struct bch_dev *, u64, int);
+#else
+static inline void bch2_latency_acct(struct bch_dev *ca, u64 submit_time, int rw) {}
+#endif
+
+void bch2_submit_wbio_replicas(struct bch_write_bio *, struct bch_fs *,
+			       enum bch_data_type, const struct bkey_i *);
+
+#define BLK_STS_REMOVED		((__force blk_status_t)128)
+
+enum bch_write_flags {
+	BCH_WRITE_ALLOC_NOWAIT		= (1 << 0),
+	BCH_WRITE_CACHED		= (1 << 1),
+	BCH_WRITE_FLUSH			= (1 << 2),
+	BCH_WRITE_DATA_ENCODED		= (1 << 3),
+	BCH_WRITE_PAGES_STABLE		= (1 << 4),
+	BCH_WRITE_PAGES_OWNED		= (1 << 5),
+	BCH_WRITE_ONLY_SPECIFIED_DEVS	= (1 << 6),
+	BCH_WRITE_NOPUT_RESERVATION	= (1 << 7),
+	BCH_WRITE_NOMARK_REPLICAS	= (1 << 8),
+
+	/* Internal: */
+	BCH_WRITE_JOURNAL_SEQ_PTR	= (1 << 9),
+};
+
+static inline u64 *op_journal_seq(struct bch_write_op *op)
+{
+	return (op->flags & BCH_WRITE_JOURNAL_SEQ_PTR)
+		? op->journal_seq_p : &op->journal_seq;
+}
+
+static inline void op_journal_seq_set(struct bch_write_op *op, u64 *journal_seq)
+{
+	op->journal_seq_p = journal_seq;
+	op->flags |= BCH_WRITE_JOURNAL_SEQ_PTR;
+}
+
+static inline struct workqueue_struct *index_update_wq(struct bch_write_op *op)
+{
+	return op->alloc_reserve == RESERVE_MOVINGGC
+		? op->c->copygc_wq
+		: op->c->wq;
+}
+
+int bch2_write_index_default(struct bch_write_op *);
+
+static inline void bch2_write_op_init(struct bch_write_op *op, struct bch_fs *c,
+				      struct bch_io_opts opts)
+{
+	op->c			= c;
+	op->io_wq		= index_update_wq(op);
+	op->flags		= 0;
+	op->written		= 0;
+	op->error		= 0;
+	op->csum_type		= bch2_data_checksum_type(c, opts.data_checksum);
+	op->compression_type	= bch2_compression_opt_to_type[opts.compression];
+	op->nr_replicas		= 0;
+	op->nr_replicas_required = c->opts.data_replicas_required;
+	op->alloc_reserve	= RESERVE_NONE;
+	op->open_buckets_nr	= 0;
+	op->devs_have.nr	= 0;
+	op->target		= 0;
+	op->opts		= opts;
+	op->pos			= POS_MAX;
+	op->version		= ZERO_VERSION;
+	op->write_point		= (struct write_point_specifier) { 0 };
+	op->res			= (struct disk_reservation) { 0 };
+	op->journal_seq		= 0;
+	op->index_update_fn	= bch2_write_index_default;
+}
+
+void bch2_write(struct closure *);
+
+static inline struct bch_write_bio *wbio_init(struct bio *bio)
+{
+	struct bch_write_bio *wbio = to_wbio(bio);
+
+	memset(&wbio->wbio, 0, sizeof(wbio->wbio));
+	return wbio;
+}
+
+struct bch_devs_mask;
+struct cache_promote_op;
+struct extent_pick_ptr;
+
+int __bch2_read_extent(struct bch_fs *, struct bch_read_bio *, struct bvec_iter,
+		       struct bkey_s_c, struct bch_devs_mask *, unsigned);
+void bch2_read(struct bch_fs *, struct bch_read_bio *, u64);
+
+enum bch_read_flags {
+	BCH_READ_RETRY_IF_STALE		= 1 << 0,
+	BCH_READ_MAY_PROMOTE		= 1 << 1,
+	BCH_READ_USER_MAPPED		= 1 << 2,
+	BCH_READ_NODECODE		= 1 << 3,
+	BCH_READ_LAST_FRAGMENT		= 1 << 4,
+
+	/* internal: */
+	BCH_READ_MUST_BOUNCE		= 1 << 5,
+	BCH_READ_MUST_CLONE		= 1 << 6,
+	BCH_READ_IN_RETRY		= 1 << 7,
+};
+
+static inline void bch2_read_extent(struct bch_fs *c,
+				    struct bch_read_bio *rbio,
+				    struct bkey_s_c k,
+				    unsigned flags)
+{
+	__bch2_read_extent(c, rbio, rbio->bio.bi_iter, k, NULL, flags);
+}
+
+static inline struct bch_read_bio *rbio_init(struct bio *bio,
+					     struct bch_io_opts opts)
+{
+	struct bch_read_bio *rbio = to_rbio(bio);
+
+	rbio->_state	= 0;
+	rbio->promote	= NULL;
+	rbio->opts	= opts;
+	return rbio;
+}
+
+void bch2_fs_io_exit(struct bch_fs *);
+int bch2_fs_io_init(struct bch_fs *);
+
+#endif /* _BCACHEFS_IO_H */