X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libbcachefs%2Fsuper-io.c;h=136c01403c95465c23488504c0f2e92798bd10e2;hb=e3e7f67b3ed89f5b3158142c29e66bb98f868ce2;hp=b174003b570ace9d5962d8300bfe66d94a96327b;hpb=5d507f795b0b679a67e972a48cbd0854c4ad0f02;p=bcachefs-tools-debian

diff --git a/libbcachefs/super-io.c b/libbcachefs/super-io.c
index b174003..136c014 100644
--- a/libbcachefs/super-io.c
+++ b/libbcachefs/super-io.c
@@ -1,41 +1,90 @@
 // SPDX-License-Identifier: GPL-2.0
 
 #include "bcachefs.h"
-#include "btree_update_interior.h"
-#include "buckets.h"
 #include "checksum.h"
+#include "counters.h"
 #include "disk_groups.h"
 #include "ec.h"
 #include "error.h"
-#include "io.h"
 #include "journal.h"
-#include "journal_io.h"
 #include "journal_sb.h"
 #include "journal_seq_blacklist.h"
+#include "recovery.h"
 #include "replicas.h"
 #include "quota.h"
+#include "sb-clean.h"
+#include "sb-errors.h"
+#include "sb-members.h"
 #include "super-io.h"
 #include "super.h"
 #include "trace.h"
 #include "vstructs.h"
-#include "counters.h"
 
 #include <linux/backing-dev.h>
 #include <linux/sort.h>
 
-static const char * const bch2_metadata_versions[] = {
-#define x(t, n) [n] = #t,
+static const struct blk_holder_ops bch2_sb_handle_bdev_ops = {
+};
+
+struct bch2_metadata_version {
+	u16		version;
+	const char	*name;
+	u64		recovery_passes;
+};
+
+static const struct bch2_metadata_version bch2_metadata_versions[] = {
+#define x(n, v, _recovery_passes) {		\
+	.version = v,				\
+	.name = #n,				\
+	.recovery_passes = _recovery_passes,	\
+},
 	BCH_METADATA_VERSIONS()
 #undef x
 };
 
 void bch2_version_to_text(struct printbuf *out, unsigned v)
 {
-	const char *str = v < ARRAY_SIZE(bch2_metadata_versions)
-		? bch2_metadata_versions[v]
-		: "(unknown version)";
+	const char *str = "(unknown version)";
+
+	for (unsigned i = 0; i < ARRAY_SIZE(bch2_metadata_versions); i++)
+		if (bch2_metadata_versions[i].version == v) {
+			str = bch2_metadata_versions[i].name;
+			break;
+		}
+
+	prt_printf(out, "%u.%u: %s", BCH_VERSION_MAJOR(v), BCH_VERSION_MINOR(v), str);
+}
+
+unsigned bch2_latest_compatible_version(unsigned v)
+{
+	if (!BCH_VERSION_MAJOR(v))
+		return v;
+
+	for (unsigned i = 0; i < ARRAY_SIZE(bch2_metadata_versions); i++)
+		if (bch2_metadata_versions[i].version > v &&
+		    BCH_VERSION_MAJOR(bch2_metadata_versions[i].version) ==
+		    BCH_VERSION_MAJOR(v))
+			v = bch2_metadata_versions[i].version;
+
+	return v;
+}
+
+u64 bch2_upgrade_recovery_passes(struct bch_fs *c,
+				 unsigned old_version,
+				 unsigned new_version)
+{
+	u64 ret = 0;
+
+	for (const struct bch2_metadata_version *i = bch2_metadata_versions;
+	     i < bch2_metadata_versions + ARRAY_SIZE(bch2_metadata_versions);
+	     i++)
+		if (i->version > old_version && i->version <= new_version) {
+			if (i->recovery_passes & RECOVERY_PASS_ALL_FSCK)
+				ret |= bch2_fsck_recovery_passes();
+			ret |= i->recovery_passes;
+		}
 
-	prt_printf(out, "%u: %s", v, str);
+	return ret &= ~RECOVERY_PASS_ALL_FSCK;
 }
 
 const char * const bch2_sb_fields[] = {
@@ -48,7 +97,7 @@ const char * const bch2_sb_fields[] = {
 static int bch2_sb_field_validate(struct bch_sb *, struct bch_sb_field *,
 				  struct printbuf *);
 
-struct bch_sb_field *bch2_sb_field_get(struct bch_sb *sb,
+struct bch_sb_field *bch2_sb_field_get_id(struct bch_sb *sb,
 				      enum bch_sb_field_type type)
 {
 	struct bch_sb_field *f;
@@ -103,7 +152,7 @@ static struct bch_sb_field *__bch2_sb_field_resize(struct bch_sb_handle *sb,
 void bch2_sb_field_delete(struct bch_sb_handle *sb,
 			  enum bch_sb_field_type type)
 {
-	struct bch_sb_field *f = bch2_sb_field_get(sb->sb, type);
+	struct bch_sb_field *f = bch2_sb_field_get_id(sb->sb, type);
 
 	if (f)
 		__bch2_sb_field_resize(sb, f, 0);
@@ -115,7 +164,9 @@ void bch2_free_super(struct bch_sb_handle *sb)
 {
 	kfree(sb->bio);
 	if (!IS_ERR_OR_NULL(sb->bdev))
-		blkdev_put(sb->bdev, sb->mode);
+		blkdev_put(sb->bdev, sb->holder);
+	kfree(sb->holder);
+	kfree(sb->sb_name);
 
 	kfree(sb->sb);
 	memset(sb, 0, sizeof(*sb));
@@ -136,7 +187,7 @@ int bch2_sb_realloc(struct bch_sb_handle *sb, unsigned u64s)
 	if (sb->sb && sb->buffer_size >= new_buffer_size)
 		return 0;
 
-	if (sb->have_layout) {
+	if (sb->sb && sb->have_layout) {
 		u64 max_bytes = 512 << sb->sb->layout.sb_max_size_bits;
 
 		if (new_bytes > max_bytes) {
@@ -152,8 +203,14 @@ int bch2_sb_realloc(struct bch_sb_handle *sb, unsigned u64s)
 	if (dynamic_fault("bcachefs:add:super_realloc"))
 		return -BCH_ERR_ENOMEM_sb_realloc_injected;
 
+	new_sb = krealloc(sb->sb, new_buffer_size, GFP_NOFS|__GFP_ZERO);
+	if (!new_sb)
+		return -BCH_ERR_ENOMEM_sb_buf_realloc;
+
+	sb->sb = new_sb;
+
 	if (sb->have_bio) {
-		unsigned nr_bvecs = DIV_ROUND_UP(new_buffer_size, PAGE_SIZE);
+		unsigned nr_bvecs = buf_pages(sb->sb, new_buffer_size);
 
 		bio = bio_kmalloc(nr_bvecs, GFP_KERNEL);
 		if (!bio)
@@ -165,21 +222,16 @@ int bch2_sb_realloc(struct bch_sb_handle *sb, unsigned u64s)
 		sb->bio = bio;
 	}
 
-	new_sb = krealloc(sb->sb, new_buffer_size, GFP_NOFS|__GFP_ZERO);
-	if (!new_sb)
-		return -BCH_ERR_ENOMEM_sb_buf_realloc;
-
-	sb->sb = new_sb;
 	sb->buffer_size = new_buffer_size;
 
 	return 0;
 }
 
-struct bch_sb_field *bch2_sb_field_resize(struct bch_sb_handle *sb,
+struct bch_sb_field *bch2_sb_field_resize_id(struct bch_sb_handle *sb,
 					  enum bch_sb_field_type type,
 					  unsigned u64s)
 {
-	struct bch_sb_field *f = bch2_sb_field_get(sb->sb, type);
+	struct bch_sb_field *f = bch2_sb_field_get_id(sb->sb, type);
 	ssize_t old_u64s = f ? le32_to_cpu(f->u64s) : 0;
 	ssize_t d = -old_u64s + u64s;
 
@@ -196,16 +248,16 @@ struct bch_sb_field *bch2_sb_field_resize(struct bch_sb_handle *sb,
 		/* XXX: we're not checking that offline device have enough space */
 
 		for_each_online_member(ca, c, i) {
-			struct bch_sb_handle *sb = &ca->disk_sb;
+			struct bch_sb_handle *dev_sb = &ca->disk_sb;
 
-			if (bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s) + d)) {
+			if (bch2_sb_realloc(dev_sb, le32_to_cpu(dev_sb->sb->u64s) + d)) {
 				percpu_ref_put(&ca->ref);
 				return NULL;
 			}
 		}
 	}
 
-	f = bch2_sb_field_get(sb->sb, type);
+	f = bch2_sb_field_get_id(sb->sb, type);
 	f = __bch2_sb_field_resize(sb, f, u64s);
 	if (f)
 		f->type = cpu_to_le32(type);
@@ -214,16 +266,13 @@ struct bch_sb_field *bch2_sb_field_resize(struct bch_sb_handle *sb,
 
 /* Superblock validate: */
 
-static inline void __bch2_sb_layout_size_assert(void)
-{
-	BUILD_BUG_ON(sizeof(struct bch_sb_layout) != 512);
-}
-
 static int validate_sb_layout(struct bch_sb_layout *layout, struct printbuf *out)
 {
 	u64 offset, prev_offset, max_sectors;
 	unsigned i;
 
+	BUILD_BUG_ON(sizeof(struct bch_sb_layout) != 512);
+
 	if (!uuid_equal(&layout->magic, &BCACHE_MAGIC) &&
 	    !uuid_equal(&layout->magic, &BCHFS_MAGIC)) {
 		prt_printf(out, "Not a bcachefs superblock layout");
@@ -308,7 +357,7 @@ static int bch2_sb_validate(struct bch_sb_handle *disk_sb, struct printbuf *out,
 {
 	struct bch_sb *sb = disk_sb->sb;
 	struct bch_sb_field *f;
-	struct bch_sb_field_members *mi;
+	struct bch_sb_field_members_v1 *mi;
 	enum bch_opt_id opt_id;
 	u16 block_size;
 	int ret;
@@ -337,7 +386,7 @@ static int bch2_sb_validate(struct bch_sb_handle *disk_sb, struct printbuf *out,
 	}
 
 	if (bch2_is_zero(sb->uuid.b, sizeof(sb->uuid))) {
-		prt_printf(out, "Bad intenal UUID (got zeroes)");
+		prt_printf(out, "Bad internal UUID (got zeroes)");
 		return -BCH_ERR_invalid_sb_uuid;
 	}
 
@@ -371,6 +420,9 @@ static int bch2_sb_validate(struct bch_sb_handle *disk_sb, struct printbuf *out,
 			SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000);
 		if (!BCH_SB_JOURNAL_RECLAIM_DELAY(sb))
 			SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 1000);
+
+		if (!BCH_SB_VERSION_UPGRADE_COMPLETE(sb))
+			SET_BCH_SB_VERSION_UPGRADE_COMPLETE(sb, le16_to_cpu(sb->version));
 	}
 
 	for (opt_id = 0; opt_id < bch2_opts_nr; opt_id++) {
@@ -408,7 +460,7 @@ static int bch2_sb_validate(struct bch_sb_handle *disk_sb, struct printbuf *out,
 	}
 
 	/* members must be validated first: */
-	mi = bch2_sb_get_members(sb);
+	mi = bch2_sb_field_get(sb, members_v1);
 	if (!mi) {
 		prt_printf(out, "Invalid superblock: member info area missing");
 		return -BCH_ERR_invalid_sb_members_missing;
@@ -419,7 +471,7 @@ static int bch2_sb_validate(struct bch_sb_handle *disk_sb, struct printbuf *out,
 		return ret;
 
 	vstruct_for_each(sb, f) {
-		if (le32_to_cpu(f->type) == BCH_SB_FIELD_members)
+		if (le32_to_cpu(f->type) == BCH_SB_FIELD_members_v1)
 			continue;
 
 		ret = bch2_sb_field_validate(sb, f, out);
@@ -435,7 +487,6 @@ static int bch2_sb_validate(struct bch_sb_handle *disk_sb, struct printbuf *out,
 static void bch2_sb_update(struct bch_fs *c)
 {
 	struct bch_sb *src = c->disk_sb.sb;
-	struct bch_sb_field_members *mi = bch2_sb_get_members(src);
 	struct bch_dev *ca;
 	unsigned i;
 
@@ -445,7 +496,7 @@ static void bch2_sb_update(struct bch_fs *c)
 	c->sb.user_uuid		= src->user_uuid;
 	c->sb.version		= le16_to_cpu(src->version);
 	c->sb.version_min	= le16_to_cpu(src->version_min);
-	c->sb.version_upgrade_complete = BCH_SB_VERSION_UPGRADE_COMPLETE(src) ?: c->sb.version;
+	c->sb.version_upgrade_complete = BCH_SB_VERSION_UPGRADE_COMPLETE(src);
 	c->sb.nr_devices	= src->nr_devices;
 	c->sb.clean		= BCH_SB_CLEAN(src);
 	c->sb.encryption_type	= BCH_SB_ENCRYPTION_TYPE(src);
@@ -461,8 +512,10 @@ static void bch2_sb_update(struct bch_fs *c)
 	c->sb.features		= le64_to_cpu(src->features[0]);
 	c->sb.compat		= le64_to_cpu(src->compat[0]);
 
-	for_each_member_device(ca, c, i)
-		ca->mi = bch2_mi_to_cpu(mi->members + i);
+	for_each_member_device(ca, c, i) {
+		struct bch_member m = bch2_sb_member_get(src, i);
+		ca->mi = bch2_mi_to_cpu(&m);
+	}
 }
 
 static int __copy_super(struct bch_sb_handle *dst_handle, struct bch_sb *src)
@@ -495,18 +548,20 @@ static int __copy_super(struct bch_sb_handle *dst_handle, struct bch_sb *src)
 		if ((1U << i) & BCH_SINGLE_DEVICE_SB_FIELDS)
 			continue;
 
-		src_f = bch2_sb_field_get(src, i);
-		dst_f = bch2_sb_field_get(dst, i);
+		src_f = bch2_sb_field_get_id(src, i);
+		dst_f = bch2_sb_field_get_id(dst, i);
 
 		d = (src_f ? le32_to_cpu(src_f->u64s) : 0) -
 		    (dst_f ? le32_to_cpu(dst_f->u64s) : 0);
 		if (d > 0) {
-			int ret = bch2_sb_realloc(dst_handle, le32_to_cpu(dst_handle->sb->u64s) + d);
+			int ret = bch2_sb_realloc(dst_handle,
+					le32_to_cpu(dst_handle->sb->u64s) + d);
+
 			if (ret)
 				return ret;
 
 			dst = dst_handle->sb;
-			dst_f = bch2_sb_field_get(dst, i);
+			dst_f = bch2_sb_field_get_id(dst, i);
 		}
 
 		dst_f = __bch2_sb_field_resize(dst_handle, dst_f,
@@ -603,32 +658,47 @@ reread:
 	return 0;
 }
 
-int bch2_read_super(const char *path, struct bch_opts *opts,
-		    struct bch_sb_handle *sb)
+static int __bch2_read_super(const char *path, struct bch_opts *opts,
+		    struct bch_sb_handle *sb, bool ignore_notbchfs_msg)
 {
 	u64 offset = opt_get(*opts, sb);
 	struct bch_sb_layout layout;
 	struct printbuf err = PRINTBUF;
+	struct printbuf err2 = PRINTBUF;
 	__le64 *i;
 	int ret;
-
+#ifndef __KERNEL__
+retry:
+#endif
 	memset(sb, 0, sizeof(*sb));
-	sb->mode	= FMODE_READ;
+	sb->mode	= BLK_OPEN_READ;
 	sb->have_bio	= true;
+	sb->holder	= kmalloc(1, GFP_KERNEL);
+	if (!sb->holder)
+		return -ENOMEM;
+
+	sb->sb_name = kstrdup(path, GFP_KERNEL);
+	if (!sb->sb_name)
+		return -ENOMEM;
+
+#ifndef __KERNEL__
+	if (opt_get(*opts, direct_io) == false)
+		sb->mode |= BLK_OPEN_BUFFERED;
+#endif
 
 	if (!opt_get(*opts, noexcl))
-		sb->mode |= FMODE_EXCL;
+		sb->mode |= BLK_OPEN_EXCL;
 
 	if (!opt_get(*opts, nochanges))
-		sb->mode |= FMODE_WRITE;
+		sb->mode |= BLK_OPEN_WRITE;
 
-	sb->bdev = blkdev_get_by_path(path, sb->mode, sb);
+	sb->bdev = blkdev_get_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops);
 	if (IS_ERR(sb->bdev) &&
 	    PTR_ERR(sb->bdev) == -EACCES &&
 	    opt_get(*opts, read_only)) {
-		sb->mode &= ~FMODE_WRITE;
+		sb->mode &= ~BLK_OPEN_WRITE;
 
-		sb->bdev = blkdev_get_by_path(path, sb->mode, sb);
+		sb->bdev = blkdev_get_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops);
 		if (!IS_ERR(sb->bdev))
 			opt_set(*opts, nochanges, true);
 	}
@@ -657,8 +727,14 @@ int bch2_read_super(const char *path, struct bch_opts *opts,
 	if (opt_defined(*opts, sb))
 		goto err;
 
-	printk(KERN_ERR "bcachefs (%s): error reading default superblock: %s",
+	prt_printf(&err2, "bcachefs (%s): error reading default superblock: %s\n",
 	       path, err.buf);
+	if (ret == -BCH_ERR_invalid_sb_magic && ignore_notbchfs_msg)
+		printk(KERN_INFO "%s", err2.buf);
+	else
+		printk(KERN_ERR "%s", err2.buf);
+
+	printbuf_exit(&err2);
 	printbuf_reset(&err);
 
 	/*
@@ -700,7 +776,13 @@ int bch2_read_super(const char *path, struct bch_opts *opts,
 
 got_super:
 	if (le16_to_cpu(sb->sb->block_size) << 9 <
-	    bdev_logical_block_size(sb->bdev)) {
+	    bdev_logical_block_size(sb->bdev) &&
+	    opt_get(*opts, direct_io)) {
+#ifndef __KERNEL__
+		opt_set(*opts, direct_io, false);
+		bch2_free_super(sb);
+		goto retry;
+#endif
 		prt_printf(&err, "block size (%u) smaller than device block size (%u)",
 		       le16_to_cpu(sb->sb->block_size) << 9,
 		       bdev_logical_block_size(sb->bdev));
@@ -713,7 +795,7 @@ got_super:
 
 	ret = bch2_sb_validate(sb, &err, READ);
 	if (ret) {
-		printk(KERN_ERR "bcachefs (%s): error validating superblock: %s",
+		printk(KERN_ERR "bcachefs (%s): error validating superblock: %s\n",
 		       path, err.buf);
 		goto err_no_print;
 	}
@@ -721,13 +803,27 @@ out:
 	printbuf_exit(&err);
 	return ret;
 err:
-	printk(KERN_ERR "bcachefs (%s): error reading superblock: %s",
+	printk(KERN_ERR "bcachefs (%s): error reading superblock: %s\n",
 	       path, err.buf);
 err_no_print:
 	bch2_free_super(sb);
 	goto out;
 }
 
+int bch2_read_super(const char *path, struct bch_opts *opts,
+		    struct bch_sb_handle *sb)
+{
+	return __bch2_read_super(path, opts, sb, false);
+}
+
+/* provide a silenced version for mount.bcachefs */
+
+int bch2_read_super_silent(const char *path, struct bch_opts *opts,
+		    struct bch_sb_handle *sb)
+{
+	return __bch2_read_super(path, opts, sb, true);
+}
+
 /* write superblock: */
 
 static void write_super_endio(struct bio *bio)
@@ -736,7 +832,12 @@ static void write_super_endio(struct bio *bio)
 
 	/* XXX: return errors directly */
 
-	if (bch2_dev_io_err_on(bio->bi_status, ca, "superblock write error: %s",
+	if (bch2_dev_io_err_on(bio->bi_status, ca,
+			       bio_data_dir(bio)
+			       ? BCH_MEMBER_ERROR_write
+			       : BCH_MEMBER_ERROR_read,
+			       "superblock %s error: %s",
+			       bio_data_dir(bio) ? "write" : "read",
 			       bch2_blk_status_to_str(bio->bi_status)))
 		ca->sb_write_error = 1;
 
@@ -809,21 +910,23 @@ int bch2_write_super(struct bch_fs *c)
 	closure_init_stack(cl);
 	memset(&sb_written, 0, sizeof(sb_written));
 
-	if (test_bit(BCH_FS_VERSION_UPGRADE, &c->flags)) {
-		c->disk_sb.sb->magic = BCHFS_MAGIC;
-		c->disk_sb.sb->layout.magic = BCHFS_MAGIC;
-	}
+	/* Make sure we're using the new magic numbers: */
+	c->disk_sb.sb->magic = BCHFS_MAGIC;
+	c->disk_sb.sb->layout.magic = BCHFS_MAGIC;
 
 	le64_add_cpu(&c->disk_sb.sb->seq, 1);
 
-	if (test_bit(BCH_FS_ERROR, &c->flags))
+	if (test_bit(BCH_FS_error, &c->flags))
 		SET_BCH_SB_HAS_ERRORS(c->disk_sb.sb, 1);
-	if (test_bit(BCH_FS_TOPOLOGY_ERROR, &c->flags))
+	if (test_bit(BCH_FS_topology_error, &c->flags))
 		SET_BCH_SB_HAS_TOPOLOGY_ERRORS(c->disk_sb.sb, 1);
 
 	SET_BCH_SB_BIG_ENDIAN(c->disk_sb.sb, CPU_BIG_ENDIAN);
 
 	bch2_sb_counters_from_cpu(c);
+	bch2_sb_members_from_cpu(c);
+	bch2_sb_members_cpy_v2_v1(&c->disk_sb);
+	bch2_sb_errors_from_cpu(c);
 
 	for_each_online_member(ca, c, i)
 		bch2_sb_from_fs(c, ca);
@@ -946,471 +1049,32 @@ void __bch2_check_set_feature(struct bch_fs *c, unsigned feat)
 	mutex_unlock(&c->sb_lock);
 }
 
-/* BCH_SB_FIELD_members: */
-
-static int bch2_sb_members_validate(struct bch_sb *sb,
-				    struct bch_sb_field *f,
-				    struct printbuf *err)
-{
-	struct bch_sb_field_members *mi = field_to_type(f, members);
-	unsigned i;
-
-	if ((void *) (mi->members + sb->nr_devices) >
-	    vstruct_end(&mi->field)) {
-		prt_printf(err, "too many devices for section size");
-		return -BCH_ERR_invalid_sb_members;
-	}
-
-	for (i = 0; i < sb->nr_devices; i++) {
-		struct bch_member *m = mi->members + i;
-
-		if (!bch2_member_exists(m))
-			continue;
-
-		if (le64_to_cpu(m->nbuckets) > LONG_MAX) {
-			prt_printf(err, "device %u: too many buckets (got %llu, max %lu)",
-			       i, le64_to_cpu(m->nbuckets), LONG_MAX);
-			return -BCH_ERR_invalid_sb_members;
-		}
-
-		if (le64_to_cpu(m->nbuckets) -
-		    le16_to_cpu(m->first_bucket) < BCH_MIN_NR_NBUCKETS) {
-			prt_printf(err, "device %u: not enough buckets (got %llu, max %u)",
-			       i, le64_to_cpu(m->nbuckets), BCH_MIN_NR_NBUCKETS);
-			return -BCH_ERR_invalid_sb_members;
-		}
-
-		if (le16_to_cpu(m->bucket_size) <
-		    le16_to_cpu(sb->block_size)) {
-			prt_printf(err, "device %u: bucket size %u smaller than block size %u",
-			       i, le16_to_cpu(m->bucket_size), le16_to_cpu(sb->block_size));
-			return -BCH_ERR_invalid_sb_members;
-		}
-
-		if (le16_to_cpu(m->bucket_size) <
-		    BCH_SB_BTREE_NODE_SIZE(sb)) {
-			prt_printf(err, "device %u: bucket size %u smaller than btree node size %llu",
-			       i, le16_to_cpu(m->bucket_size), BCH_SB_BTREE_NODE_SIZE(sb));
-			return -BCH_ERR_invalid_sb_members;
-		}
-	}
-
-	return 0;
-}
-
-static void bch2_sb_members_to_text(struct printbuf *out, struct bch_sb *sb,
-				    struct bch_sb_field *f)
-{
-	struct bch_sb_field_members *mi = field_to_type(f, members);
-	struct bch_sb_field_disk_groups *gi = bch2_sb_get_disk_groups(sb);
-	unsigned i;
-
-	for (i = 0; i < sb->nr_devices; i++) {
-		struct bch_member *m = mi->members + i;
-		unsigned data_have = bch2_sb_dev_has_data(sb, i);
-		u64 bucket_size = le16_to_cpu(m->bucket_size);
-		u64 device_size = le64_to_cpu(m->nbuckets) * bucket_size;
-
-		if (!bch2_member_exists(m))
-			continue;
-
-		prt_printf(out, "Device:");
-		prt_tab(out);
-		prt_printf(out, "%u", i);
-		prt_newline(out);
-
-		printbuf_indent_add(out, 2);
-
-		prt_printf(out, "UUID:");
-		prt_tab(out);
-		pr_uuid(out, m->uuid.b);
-		prt_newline(out);
-
-		prt_printf(out, "Size:");
-		prt_tab(out);
-		prt_units_u64(out, device_size << 9);
-		prt_newline(out);
-
-		prt_printf(out, "Bucket size:");
-		prt_tab(out);
-		prt_units_u64(out, bucket_size << 9);
-		prt_newline(out);
-
-		prt_printf(out, "First bucket:");
-		prt_tab(out);
-		prt_printf(out, "%u", le16_to_cpu(m->first_bucket));
-		prt_newline(out);
-
-		prt_printf(out, "Buckets:");
-		prt_tab(out);
-		prt_printf(out, "%llu", le64_to_cpu(m->nbuckets));
-		prt_newline(out);
-
-		prt_printf(out, "Last mount:");
-		prt_tab(out);
-		if (m->last_mount)
-			pr_time(out, le64_to_cpu(m->last_mount));
-		else
-			prt_printf(out, "(never)");
-		prt_newline(out);
-
-		prt_printf(out, "State:");
-		prt_tab(out);
-		prt_printf(out, "%s",
-		       BCH_MEMBER_STATE(m) < BCH_MEMBER_STATE_NR
-		       ? bch2_member_states[BCH_MEMBER_STATE(m)]
-		       : "unknown");
-		prt_newline(out);
-
-		prt_printf(out, "Label:");
-		prt_tab(out);
-		if (BCH_MEMBER_GROUP(m)) {
-			unsigned idx = BCH_MEMBER_GROUP(m) - 1;
-
-			if (idx < disk_groups_nr(gi))
-				prt_printf(out, "%s (%u)",
-				       gi->entries[idx].label, idx);
-			else
-				prt_printf(out, "(bad disk labels section)");
-		} else {
-			prt_printf(out, "(none)");
-		}
-		prt_newline(out);
-
-		prt_printf(out, "Data allowed:");
-		prt_tab(out);
-		if (BCH_MEMBER_DATA_ALLOWED(m))
-			prt_bitflags(out, bch2_data_types, BCH_MEMBER_DATA_ALLOWED(m));
-		else
-			prt_printf(out, "(none)");
-		prt_newline(out);
-
-		prt_printf(out, "Has data:");
-		prt_tab(out);
-		if (data_have)
-			prt_bitflags(out, bch2_data_types, data_have);
-		else
-			prt_printf(out, "(none)");
-		prt_newline(out);
-
-		prt_printf(out, "Discard:");
-		prt_tab(out);
-		prt_printf(out, "%llu", BCH_MEMBER_DISCARD(m));
-		prt_newline(out);
-
-		prt_printf(out, "Freespace initialized:");
-		prt_tab(out);
-		prt_printf(out, "%llu", BCH_MEMBER_FREESPACE_INITIALIZED(m));
-		prt_newline(out);
-
-		printbuf_indent_sub(out, 2);
-	}
-}
-
-static const struct bch_sb_field_ops bch_sb_field_ops_members = {
-	.validate	= bch2_sb_members_validate,
-	.to_text	= bch2_sb_members_to_text,
-};
-
-/* BCH_SB_FIELD_crypt: */
-
-static int bch2_sb_crypt_validate(struct bch_sb *sb,
-				  struct bch_sb_field *f,
-				  struct printbuf *err)
-{
-	struct bch_sb_field_crypt *crypt = field_to_type(f, crypt);
-
-	if (vstruct_bytes(&crypt->field) < sizeof(*crypt)) {
-		prt_printf(err, "wrong size (got %zu should be %zu)",
-		       vstruct_bytes(&crypt->field), sizeof(*crypt));
-		return -BCH_ERR_invalid_sb_crypt;
-	}
-
-	if (BCH_CRYPT_KDF_TYPE(crypt)) {
-		prt_printf(err, "bad kdf type %llu", BCH_CRYPT_KDF_TYPE(crypt));
-		return -BCH_ERR_invalid_sb_crypt;
-	}
-
-	return 0;
-}
-
-static void bch2_sb_crypt_to_text(struct printbuf *out, struct bch_sb *sb,
-				  struct bch_sb_field *f)
-{
-	struct bch_sb_field_crypt *crypt = field_to_type(f, crypt);
-
-	prt_printf(out, "KFD:               %llu", BCH_CRYPT_KDF_TYPE(crypt));
-	prt_newline(out);
-	prt_printf(out, "scrypt n:          %llu", BCH_KDF_SCRYPT_N(crypt));
-	prt_newline(out);
-	prt_printf(out, "scrypt r:          %llu", BCH_KDF_SCRYPT_R(crypt));
-	prt_newline(out);
-	prt_printf(out, "scrypt p:          %llu", BCH_KDF_SCRYPT_P(crypt));
-	prt_newline(out);
-}
-
-static const struct bch_sb_field_ops bch_sb_field_ops_crypt = {
-	.validate	= bch2_sb_crypt_validate,
-	.to_text	= bch2_sb_crypt_to_text,
-};
-
-/* BCH_SB_FIELD_clean: */
-
-int bch2_sb_clean_validate_late(struct bch_fs *c, struct bch_sb_field_clean *clean, int write)
-{
-	struct jset_entry *entry;
-	int ret;
-
-	for (entry = clean->start;
-	     entry < (struct jset_entry *) vstruct_end(&clean->field);
-	     entry = vstruct_next(entry)) {
-		ret = bch2_journal_entry_validate(c, NULL, entry,
-						  le16_to_cpu(c->disk_sb.sb->version),
-						  BCH_SB_BIG_ENDIAN(c->disk_sb.sb),
-						  write);
-		if (ret)
-			return ret;
-	}
-
-	return 0;
-}
-
-int bch2_fs_mark_dirty(struct bch_fs *c)
+/* Downgrade if superblock is at a higher version than currently supported: */
+void bch2_sb_maybe_downgrade(struct bch_fs *c)
 {
-	int ret;
+	lockdep_assert_held(&c->sb_lock);
 
 	/*
-	 * Unconditionally write superblock, to verify it hasn't changed before
-	 * we go rw:
+	 * Downgrade, if superblock is at a higher version than currently
+	 * supported:
 	 */
-
-	mutex_lock(&c->sb_lock);
-	SET_BCH_SB_CLEAN(c->disk_sb.sb, false);
-
 	if (BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb) > bcachefs_metadata_version_current)
 		SET_BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb, bcachefs_metadata_version_current);
-
-	if (test_bit(BCH_FS_VERSION_UPGRADE, &c->flags) ||
-	    c->sb.version > bcachefs_metadata_version_current)
+	if (c->sb.version > bcachefs_metadata_version_current)
 		c->disk_sb.sb->version = cpu_to_le16(bcachefs_metadata_version_current);
-
-	if (test_bit(BCH_FS_VERSION_UPGRADE, &c->flags))
-		c->disk_sb.sb->features[0] |= cpu_to_le64(BCH_SB_FEATURES_ALL);
-
-	c->disk_sb.sb->features[0] |= cpu_to_le64(BCH_SB_FEATURES_ALWAYS);
-
+	if (c->sb.version_min > bcachefs_metadata_version_current)
+		c->disk_sb.sb->version_min = cpu_to_le16(bcachefs_metadata_version_current);
 	c->disk_sb.sb->compat[0] &= cpu_to_le64((1ULL << BCH_COMPAT_NR) - 1);
-	ret = bch2_write_super(c);
-	mutex_unlock(&c->sb_lock);
-
-	return ret;
 }
 
-static struct jset_entry *jset_entry_init(struct jset_entry **end, size_t size)
+void bch2_sb_upgrade(struct bch_fs *c, unsigned new_version)
 {
-	struct jset_entry *entry = *end;
-	unsigned u64s = DIV_ROUND_UP(size, sizeof(u64));
-
-	memset(entry, 0, u64s * sizeof(u64));
-	/*
-	 * The u64s field counts from the start of data, ignoring the shared
-	 * fields.
-	 */
-	entry->u64s = cpu_to_le16(u64s - 1);
-
-	*end = vstruct_next(*end);
-	return entry;
-}
-
-void bch2_journal_super_entries_add_common(struct bch_fs *c,
-					   struct jset_entry **end,
-					   u64 journal_seq)
-{
-	struct bch_dev *ca;
-	unsigned i, dev;
-
-	percpu_down_read(&c->mark_lock);
-
-	if (!journal_seq) {
-		for (i = 0; i < ARRAY_SIZE(c->usage); i++)
-			bch2_fs_usage_acc_to_base(c, i);
-	} else {
-		bch2_fs_usage_acc_to_base(c, journal_seq & JOURNAL_BUF_MASK);
-	}
-
-	{
-		struct jset_entry_usage *u =
-			container_of(jset_entry_init(end, sizeof(*u)),
-				     struct jset_entry_usage, entry);
-
-		u->entry.type	= BCH_JSET_ENTRY_usage;
-		u->entry.btree_id = BCH_FS_USAGE_inodes;
-		u->v		= cpu_to_le64(c->usage_base->nr_inodes);
-	}
-
-	{
-		struct jset_entry_usage *u =
-			container_of(jset_entry_init(end, sizeof(*u)),
-				     struct jset_entry_usage, entry);
-
-		u->entry.type	= BCH_JSET_ENTRY_usage;
-		u->entry.btree_id = BCH_FS_USAGE_key_version;
-		u->v		= cpu_to_le64(atomic64_read(&c->key_version));
-	}
-
-	for (i = 0; i < BCH_REPLICAS_MAX; i++) {
-		struct jset_entry_usage *u =
-			container_of(jset_entry_init(end, sizeof(*u)),
-				     struct jset_entry_usage, entry);
-
-		u->entry.type	= BCH_JSET_ENTRY_usage;
-		u->entry.btree_id = BCH_FS_USAGE_reserved;
-		u->entry.level	= i;
-		u->v		= cpu_to_le64(c->usage_base->persistent_reserved[i]);
-	}
-
-	for (i = 0; i < c->replicas.nr; i++) {
-		struct bch_replicas_entry *e =
-			cpu_replicas_entry(&c->replicas, i);
-		struct jset_entry_data_usage *u =
-			container_of(jset_entry_init(end, sizeof(*u) + e->nr_devs),
-				     struct jset_entry_data_usage, entry);
-
-		u->entry.type	= BCH_JSET_ENTRY_data_usage;
-		u->v		= cpu_to_le64(c->usage_base->replicas[i]);
-		unsafe_memcpy(&u->r, e, replicas_entry_bytes(e),
-			      "embedded variable length struct");
-	}
-
-	for_each_member_device(ca, c, dev) {
-		unsigned b = sizeof(struct jset_entry_dev_usage) +
-			sizeof(struct jset_entry_dev_usage_type) * BCH_DATA_NR;
-		struct jset_entry_dev_usage *u =
-			container_of(jset_entry_init(end, b),
-				     struct jset_entry_dev_usage, entry);
-
-		u->entry.type = BCH_JSET_ENTRY_dev_usage;
-		u->dev = cpu_to_le32(dev);
-		u->buckets_ec		= cpu_to_le64(ca->usage_base->buckets_ec);
-
-		for (i = 0; i < BCH_DATA_NR; i++) {
-			u->d[i].buckets = cpu_to_le64(ca->usage_base->d[i].buckets);
-			u->d[i].sectors	= cpu_to_le64(ca->usage_base->d[i].sectors);
-			u->d[i].fragmented = cpu_to_le64(ca->usage_base->d[i].fragmented);
-		}
-	}
-
-	percpu_up_read(&c->mark_lock);
-
-	for (i = 0; i < 2; i++) {
-		struct jset_entry_clock *clock =
-			container_of(jset_entry_init(end, sizeof(*clock)),
-				     struct jset_entry_clock, entry);
-
-		clock->entry.type = BCH_JSET_ENTRY_clock;
-		clock->rw	= i;
-		clock->time	= cpu_to_le64(atomic64_read(&c->io_clock[i].now));
-	}
-}
-
-void bch2_fs_mark_clean(struct bch_fs *c)
-{
-	struct bch_sb_field_clean *sb_clean;
-	struct jset_entry *entry;
-	unsigned u64s;
-	int ret;
-
-	mutex_lock(&c->sb_lock);
-	if (BCH_SB_CLEAN(c->disk_sb.sb))
-		goto out;
-
-	SET_BCH_SB_CLEAN(c->disk_sb.sb, true);
-
-	c->disk_sb.sb->compat[0] |= cpu_to_le64(1ULL << BCH_COMPAT_alloc_info);
-	c->disk_sb.sb->compat[0] |= cpu_to_le64(1ULL << BCH_COMPAT_alloc_metadata);
-	c->disk_sb.sb->features[0] &= cpu_to_le64(~(1ULL << BCH_FEATURE_extents_above_btree_updates));
-	c->disk_sb.sb->features[0] &= cpu_to_le64(~(1ULL << BCH_FEATURE_btree_updates_journalled));
-
-	u64s = sizeof(*sb_clean) / sizeof(u64) + c->journal.entry_u64s_reserved;
-
-	sb_clean = bch2_sb_resize_clean(&c->disk_sb, u64s);
-	if (!sb_clean) {
-		bch_err(c, "error resizing superblock while setting filesystem clean");
-		goto out;
-	}
-
-	sb_clean->flags		= 0;
-	sb_clean->journal_seq	= cpu_to_le64(atomic64_read(&c->journal.seq));
-
-	/* Trying to catch outstanding bug: */
-	BUG_ON(le64_to_cpu(sb_clean->journal_seq) > S64_MAX);
-
-	entry = sb_clean->start;
-	bch2_journal_super_entries_add_common(c, &entry, 0);
-	entry = bch2_btree_roots_to_journal_entries(c, entry, entry);
-	BUG_ON((void *) entry > vstruct_end(&sb_clean->field));
-
-	memset(entry, 0,
-	       vstruct_end(&sb_clean->field) - (void *) entry);
-
-	/*
-	 * this should be in the write path, and we should be validating every
-	 * superblock section:
-	 */
-	ret = bch2_sb_clean_validate_late(c, sb_clean, WRITE);
-	if (ret) {
-		bch_err(c, "error writing marking filesystem clean: validate error");
-		goto out;
-	}
-
-	bch2_write_super(c);
-out:
-	mutex_unlock(&c->sb_lock);
-}
-
-static int bch2_sb_clean_validate(struct bch_sb *sb,
-				  struct bch_sb_field *f,
-				  struct printbuf *err)
-{
-	struct bch_sb_field_clean *clean = field_to_type(f, clean);
-
-	if (vstruct_bytes(&clean->field) < sizeof(*clean)) {
-		prt_printf(err, "wrong size (got %zu should be %zu)",
-		       vstruct_bytes(&clean->field), sizeof(*clean));
-		return -BCH_ERR_invalid_sb_clean;
-	}
-
-	return 0;
-}
-
-static void bch2_sb_clean_to_text(struct printbuf *out, struct bch_sb *sb,
-				  struct bch_sb_field *f)
-{
-	struct bch_sb_field_clean *clean = field_to_type(f, clean);
-	struct jset_entry *entry;
-
-	prt_printf(out, "flags:          %x",	le32_to_cpu(clean->flags));
-	prt_newline(out);
-	prt_printf(out, "journal_seq:    %llu",	le64_to_cpu(clean->journal_seq));
-	prt_newline(out);
-
-	for (entry = clean->start;
-	     entry != vstruct_end(&clean->field);
-	     entry = vstruct_next(entry)) {
-		if (entry->type == BCH_JSET_ENTRY_btree_keys &&
-		    !entry->u64s)
-			continue;
+	lockdep_assert_held(&c->sb_lock);
 
-		bch2_journal_entry_to_text(out, NULL, entry);
-		prt_newline(out);
-	}
+	c->disk_sb.sb->version = cpu_to_le16(new_version);
+	c->disk_sb.sb->features[0] |= cpu_to_le64(BCH_SB_FEATURES_ALL);
 }
 
-static const struct bch_sb_field_ops bch_sb_field_ops_clean = {
-	.validate	= bch2_sb_clean_validate,
-	.to_text	= bch2_sb_clean_to_text,
-};
-
 static const struct bch_sb_field_ops *bch2_sb_field_ops[] = {
 #define x(f, nr)					\
 	[BCH_SB_FIELD_##f] = &bch_sb_field_ops_##f,
@@ -1418,9 +1082,7 @@ static const struct bch_sb_field_ops *bch2_sb_field_ops[] = {
 #undef x
 };
 
-static const struct bch_sb_field_ops bch2_sb_field_null_ops = {
-	NULL
-};
+static const struct bch_sb_field_ops bch2_sb_field_null_ops;
 
 static const struct bch_sb_field_ops *bch2_sb_field_type_ops(unsigned type)
 {
@@ -1499,7 +1161,6 @@ void bch2_sb_layout_to_text(struct printbuf *out, struct bch_sb_layout *l)
 void bch2_sb_to_text(struct printbuf *out, struct bch_sb *sb,
 		     bool print_layout, unsigned fields)
 {
-	struct bch_sb_field_members *mi;
 	struct bch_sb_field *f;
 	u64 fields_have = 0;
 	unsigned nr_devices = 0;
@@ -1507,15 +1168,8 @@ void bch2_sb_to_text(struct printbuf *out, struct bch_sb *sb,
 	if (!out->nr_tabstops)
 		printbuf_tabstop_push(out, 44);
 
-	mi = bch2_sb_get_members(sb);
-	if (mi) {
-		struct bch_member *m;
-
-		for (m = mi->members;
-		     m < mi->members + sb->nr_devices;
-		     m++)
-			nr_devices += bch2_member_exists(m);
-	}
+	for (int i = 0; i < sb->nr_devices; i++)
+		nr_devices += bch2_dev_exists(sb, i);
 
 	prt_printf(out, "External UUID:");
 	prt_tab(out);
@@ -1555,7 +1209,7 @@ void bch2_sb_to_text(struct printbuf *out, struct bch_sb *sb,
 	prt_printf(out, "Created:");
 	prt_tab(out);
 	if (sb->time_base_lo)
-		pr_time(out, div_u64(le64_to_cpu(sb->time_base_lo), NSEC_PER_SEC));
+		bch2_prt_datetime(out, div_u64(le64_to_cpu(sb->time_base_lo), NSEC_PER_SEC));
 	else
 		prt_printf(out, "(not set)");
 	prt_newline(out);