// SPDX-License-Identifier: GPL-2.0
#include "bcachefs.h"
#include "checksum.h"
#include "disk_groups.h"
#include "ec.h"
#include "error.h"
#include "journal.h"
#include "journal_sb.h"
#include "journal_seq_blacklist.h"
#include "recovery_passes.h"
#include "replicas.h"
#include "quota.h"
#include "sb-clean.h"
#include "sb-counters.h"
#include "sb-downgrade.h"
#include "sb-errors.h"
#include "sb-members.h"
#include "super-io.h"
#include "super.h"
#include "trace.h"
#include "vstructs.h"
#include <linux/backing-dev.h>
#include <linux/sort.h>
static const struct blk_holder_ops bch2_sb_handle_bdev_ops = {
};
struct bch2_metadata_version {
u16 version;
const char *name;
};
static const struct bch2_metadata_version bch2_metadata_versions[] = {
#define x(n, v) { \
.version = v, \
.name = #n, \
},
BCH_METADATA_VERSIONS()
#undef x
};
void bch2_version_to_text(struct printbuf *out, unsigned v)
{
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;
}
const char * const bch2_sb_fields[] = {
#define x(name, nr) #name,
BCH_SB_FIELDS()
#undef x
NULL
};
static int bch2_sb_field_validate(struct bch_sb *, struct bch_sb_field *,
enum bch_validate_flags, struct printbuf *);
struct bch_sb_field *bch2_sb_field_get_id(struct bch_sb *sb,
enum bch_sb_field_type type)
{
/* XXX: need locking around superblock to access optional fields */
vstruct_for_each(sb, f)
if (le32_to_cpu(f->type) == type)
return f;
return NULL;
}
static struct bch_sb_field *__bch2_sb_field_resize(struct bch_sb_handle *sb,
struct bch_sb_field *f,
unsigned u64s)
{
unsigned old_u64s = f ? le32_to_cpu(f->u64s) : 0;
unsigned sb_u64s = le32_to_cpu(sb->sb->u64s) + u64s - old_u64s;
BUG_ON(__vstruct_bytes(struct bch_sb, sb_u64s) > sb->buffer_size);
if (!f && !u64s) {
/* nothing to do: */
} else if (!f) {
f = vstruct_last(sb->sb);
memset(f, 0, sizeof(u64) * u64s);
f->u64s = cpu_to_le32(u64s);
f->type = 0;
} else {
void *src, *dst;
src = vstruct_end(f);
if (u64s) {
f->u64s = cpu_to_le32(u64s);
dst = vstruct_end(f);
} else {
dst = f;
}
memmove(dst, src, vstruct_end(sb->sb) - src);
if (dst > src)
memset(src, 0, dst - src);
}
sb->sb->u64s = cpu_to_le32(sb_u64s);
return u64s ? f : NULL;
}
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_id(sb->sb, type);
if (f)
__bch2_sb_field_resize(sb, f, 0);
}
/* Superblock realloc/free: */
void bch2_free_super(struct bch_sb_handle *sb)
{
kfree(sb->bio);
if (!IS_ERR_OR_NULL(sb->s_bdev_file))
bdev_fput(sb->s_bdev_file);
kfree(sb->holder);
kfree(sb->sb_name);
kfree(sb->sb);
memset(sb, 0, sizeof(*sb));
}
int bch2_sb_realloc(struct bch_sb_handle *sb, unsigned u64s)
{
size_t new_bytes = __vstruct_bytes(struct bch_sb, u64s);
size_t new_buffer_size;
struct bch_sb *new_sb;
struct bio *bio;
if (sb->bdev)
new_bytes = max_t(size_t, new_bytes, bdev_logical_block_size(sb->bdev));
new_buffer_size = roundup_pow_of_two(new_bytes);
if (sb->sb && sb->buffer_size >= new_buffer_size)
return 0;
if (sb->sb && sb->have_layout) {
u64 max_bytes = 512 << sb->sb->layout.sb_max_size_bits;
if (new_bytes > max_bytes) {
struct printbuf buf = PRINTBUF;
prt_bdevname(&buf, sb->bdev);
prt_printf(&buf, ": superblock too big: want %zu but have %llu", new_bytes, max_bytes);
pr_err("%s", buf.buf);
printbuf_exit(&buf);
return -BCH_ERR_ENOSPC_sb;
}
}
if (sb->buffer_size >= new_buffer_size && sb->sb)
return 0;
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 = buf_pages(sb->sb, new_buffer_size);
bio = bio_kmalloc(nr_bvecs, GFP_KERNEL);
if (!bio)
return -BCH_ERR_ENOMEM_sb_bio_realloc;
bio_init(bio, NULL, bio->bi_inline_vecs, nr_bvecs, 0);
kfree(sb->bio);
sb->bio = bio;
}
sb->buffer_size = new_buffer_size;
return 0;
}
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_id(sb->sb, type);
ssize_t old_u64s = f ? le32_to_cpu(f->u64s) : 0;
ssize_t d = -old_u64s + u64s;
if (bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s) + d))
return NULL;
if (sb->fs_sb) {
struct bch_fs *c = container_of(sb, struct bch_fs, disk_sb);
lockdep_assert_held(&c->sb_lock);
/* XXX: we're not checking that offline device have enough space */
for_each_online_member(c, ca) {
struct bch_sb_handle *dev_sb = &ca->disk_sb;
if (bch2_sb_realloc(dev_sb, le32_to_cpu(dev_sb->sb->u64s) + d)) {
percpu_ref_put(&ca->io_ref);
return NULL;
}
}
}
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);
return f;
}
struct bch_sb_field *bch2_sb_field_get_minsize_id(struct bch_sb_handle *sb,
enum bch_sb_field_type type,
unsigned u64s)
{
struct bch_sb_field *f = bch2_sb_field_get_id(sb->sb, type);
if (!f || le32_to_cpu(f->u64s) < u64s)
f = bch2_sb_field_resize_id(sb, type, u64s);
return f;
}
/* Superblock validate: */
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");
return -BCH_ERR_invalid_sb_layout;
}
if (layout->layout_type != 0) {
prt_printf(out, "Invalid superblock layout type %u",
layout->layout_type);
return -BCH_ERR_invalid_sb_layout_type;
}
if (!layout->nr_superblocks) {
prt_printf(out, "Invalid superblock layout: no superblocks");
return -BCH_ERR_invalid_sb_layout_nr_superblocks;
}
if (layout->nr_superblocks > ARRAY_SIZE(layout->sb_offset)) {
prt_printf(out, "Invalid superblock layout: too many superblocks");
return -BCH_ERR_invalid_sb_layout_nr_superblocks;
}
max_sectors = 1 << layout->sb_max_size_bits;
prev_offset = le64_to_cpu(layout->sb_offset[0]);
for (i = 1; i < layout->nr_superblocks; i++) {
offset = le64_to_cpu(layout->sb_offset[i]);
if (offset < prev_offset + max_sectors) {
prt_printf(out, "Invalid superblock layout: superblocks overlap\n"
" (sb %u ends at %llu next starts at %llu",
i - 1, prev_offset + max_sectors, offset);
return -BCH_ERR_invalid_sb_layout_superblocks_overlap;
}
prev_offset = offset;
}
return 0;
}
static int bch2_sb_compatible(struct bch_sb *sb, struct printbuf *out)
{
u16 version = le16_to_cpu(sb->version);
u16 version_min = le16_to_cpu(sb->version_min);
if (!bch2_version_compatible(version)) {
prt_str(out, "Unsupported superblock version ");
bch2_version_to_text(out, version);
prt_str(out, " (min ");
bch2_version_to_text(out, bcachefs_metadata_version_min);
prt_str(out, ", max ");
bch2_version_to_text(out, bcachefs_metadata_version_current);
prt_str(out, ")");
return -BCH_ERR_invalid_sb_version;
}
if (!bch2_version_compatible(version_min)) {
prt_str(out, "Unsupported superblock version_min ");
bch2_version_to_text(out, version_min);
prt_str(out, " (min ");
bch2_version_to_text(out, bcachefs_metadata_version_min);
prt_str(out, ", max ");
bch2_version_to_text(out, bcachefs_metadata_version_current);
prt_str(out, ")");
return -BCH_ERR_invalid_sb_version;
}
if (version_min > version) {
prt_str(out, "Bad minimum version ");
bch2_version_to_text(out, version_min);
prt_str(out, ", greater than version field ");
bch2_version_to_text(out, version);
return -BCH_ERR_invalid_sb_version;
}
return 0;
}
static int bch2_sb_validate(struct bch_sb_handle *disk_sb,
enum bch_validate_flags flags, struct printbuf *out)
{
struct bch_sb *sb = disk_sb->sb;
struct bch_sb_field_members_v1 *mi;
enum bch_opt_id opt_id;
u16 block_size;
int ret;
ret = bch2_sb_compatible(sb, out);
if (ret)
return ret;
if (sb->features[1] ||
(le64_to_cpu(sb->features[0]) & (~0ULL << BCH_FEATURE_NR))) {
prt_printf(out, "Filesystem has incompatible features");
return -BCH_ERR_invalid_sb_features;
}
block_size = le16_to_cpu(sb->block_size);
if (block_size > PAGE_SECTORS) {
prt_printf(out, "Block size too big (got %u, max %u)",
block_size, PAGE_SECTORS);
return -BCH_ERR_invalid_sb_block_size;
}
if (bch2_is_zero(sb->user_uuid.b, sizeof(sb->user_uuid))) {
prt_printf(out, "Bad user UUID (got zeroes)");
return -BCH_ERR_invalid_sb_uuid;
}
if (bch2_is_zero(sb->uuid.b, sizeof(sb->uuid))) {
prt_printf(out, "Bad internal UUID (got zeroes)");
return -BCH_ERR_invalid_sb_uuid;
}
if (!sb->nr_devices ||
sb->nr_devices > BCH_SB_MEMBERS_MAX) {
prt_printf(out, "Bad number of member devices %u (max %u)",
sb->nr_devices, BCH_SB_MEMBERS_MAX);
return -BCH_ERR_invalid_sb_too_many_members;
}
if (sb->dev_idx >= sb->nr_devices) {
prt_printf(out, "Bad dev_idx (got %u, nr_devices %u)",
sb->dev_idx, sb->nr_devices);
return -BCH_ERR_invalid_sb_dev_idx;
}
if (!sb->time_precision ||
le32_to_cpu(sb->time_precision) > NSEC_PER_SEC) {
prt_printf(out, "Invalid time precision: %u (min 1, max %lu)",
le32_to_cpu(sb->time_precision), NSEC_PER_SEC);
return -BCH_ERR_invalid_sb_time_precision;
}
if (!flags) {
/*
* Been seeing a bug where these are getting inexplicably
* zeroed, so we're now validating them, but we have to be
* careful not to preven people's filesystems from mounting:
*/
if (!BCH_SB_JOURNAL_FLUSH_DELAY(sb))
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));
if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_disk_accounting_v2 &&
!BCH_SB_ALLOCATOR_STUCK_TIMEOUT(sb))
SET_BCH_SB_ALLOCATOR_STUCK_TIMEOUT(sb, 30);
if (le16_to_cpu(sb->version) <= bcachefs_metadata_version_disk_accounting_v2)
SET_BCH_SB_PROMOTE_WHOLE_EXTENTS(sb, true);
}
for (opt_id = 0; opt_id < bch2_opts_nr; opt_id++) {
const struct bch_option *opt = bch2_opt_table + opt_id;
if (opt->get_sb != BCH2_NO_SB_OPT) {
u64 v = bch2_opt_from_sb(sb, opt_id);
prt_printf(out, "Invalid option ");
ret = bch2_opt_validate(opt, v, out);
if (ret)
return ret;
printbuf_reset(out);
}
}
/* validate layout */
ret = validate_sb_layout(&sb->layout, out);
if (ret)
return ret;
vstruct_for_each(sb, f) {
if (!f->u64s) {
prt_printf(out, "Invalid superblock: optional field with size 0 (type %u)",
le32_to_cpu(f->type));
return -BCH_ERR_invalid_sb_field_size;
}
if (vstruct_next(f) > vstruct_last(sb)) {
prt_printf(out, "Invalid superblock: optional field extends past end of superblock (type %u)",
le32_to_cpu(f->type));
return -BCH_ERR_invalid_sb_field_size;
}
}
/* members must be validated first: */
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;
}
ret = bch2_sb_field_validate(sb, &mi->field, flags, out);
if (ret)
return ret;
vstruct_for_each(sb, f) {
if (le32_to_cpu(f->type) == BCH_SB_FIELD_members_v1)
continue;
ret = bch2_sb_field_validate(sb, f, flags, out);
if (ret)
return ret;
}
if ((flags & BCH_VALIDATE_write) &&
bch2_sb_member_get(sb, sb->dev_idx).seq != sb->seq) {
prt_printf(out, "Invalid superblock: member seq %llu != sb seq %llu",
le64_to_cpu(bch2_sb_member_get(sb, sb->dev_idx).seq),
le64_to_cpu(sb->seq));
return -BCH_ERR_invalid_sb_members_missing;
}
return 0;
}
/* device open: */
static unsigned long le_ulong_to_cpu(unsigned long v)
{
return sizeof(unsigned long) == 8
? le64_to_cpu(v)
: le32_to_cpu(v);
}
static void le_bitvector_to_cpu(unsigned long *dst, unsigned long *src, unsigned nr)
{
BUG_ON(nr & (BITS_PER_TYPE(long) - 1));
for (unsigned i = 0; i < BITS_TO_LONGS(nr); i++)
dst[i] = le_ulong_to_cpu(src[i]);
}
static void bch2_sb_update(struct bch_fs *c)
{
struct bch_sb *src = c->disk_sb.sb;
lockdep_assert_held(&c->sb_lock);
c->sb.uuid = src->uuid;
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.nr_devices = src->nr_devices;
c->sb.clean = BCH_SB_CLEAN(src);
c->sb.encryption_type = BCH_SB_ENCRYPTION_TYPE(src);
c->sb.nsec_per_time_unit = le32_to_cpu(src->time_precision);
c->sb.time_units_per_sec = NSEC_PER_SEC / c->sb.nsec_per_time_unit;
/* XXX this is wrong, we need a 96 or 128 bit integer type */
c->sb.time_base_lo = div_u64(le64_to_cpu(src->time_base_lo),
c->sb.nsec_per_time_unit);
c->sb.time_base_hi = le32_to_cpu(src->time_base_hi);
c->sb.features = le64_to_cpu(src->features[0]);
c->sb.compat = le64_to_cpu(src->compat[0]);
memset(c->sb.errors_silent, 0, sizeof(c->sb.errors_silent));
struct bch_sb_field_ext *ext = bch2_sb_field_get(src, ext);
if (ext) {
le_bitvector_to_cpu(c->sb.errors_silent, (void *) ext->errors_silent,
sizeof(c->sb.errors_silent) * 8);
c->sb.btrees_lost_data = le64_to_cpu(ext->btrees_lost_data);
}
for_each_member_device(c, ca) {
struct bch_member m = bch2_sb_member_get(src, ca->dev_idx);
ca->mi = bch2_mi_to_cpu(&m);
}
}
static int __copy_super(struct bch_sb_handle *dst_handle, struct bch_sb *src)
{
struct bch_sb_field *src_f, *dst_f;
struct bch_sb *dst = dst_handle->sb;
unsigned i;
dst->version = src->version;
dst->version_min = src->version_min;
dst->seq = src->seq;
dst->uuid = src->uuid;
dst->user_uuid = src->user_uuid;
memcpy(dst->label, src->label, sizeof(dst->label));
dst->block_size = src->block_size;
dst->nr_devices = src->nr_devices;
dst->time_base_lo = src->time_base_lo;
dst->time_base_hi = src->time_base_hi;
dst->time_precision = src->time_precision;
dst->write_time = src->write_time;
memcpy(dst->flags, src->flags, sizeof(dst->flags));
memcpy(dst->features, src->features, sizeof(dst->features));
memcpy(dst->compat, src->compat, sizeof(dst->compat));
for (i = 0; i < BCH_SB_FIELD_NR; i++) {
int d;
if ((1U << i) & BCH_SINGLE_DEVICE_SB_FIELDS)
continue;
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);
if (ret)
return ret;
dst = dst_handle->sb;
dst_f = bch2_sb_field_get_id(dst, i);
}
dst_f = __bch2_sb_field_resize(dst_handle, dst_f,
src_f ? le32_to_cpu(src_f->u64s) : 0);
if (src_f)
memcpy(dst_f, src_f, vstruct_bytes(src_f));
}
return 0;
}
int bch2_sb_to_fs(struct bch_fs *c, struct bch_sb *src)
{
int ret;
lockdep_assert_held(&c->sb_lock);
ret = bch2_sb_realloc(&c->disk_sb, 0) ?:
__copy_super(&c->disk_sb, src) ?:
bch2_sb_replicas_to_cpu_replicas(c) ?:
bch2_sb_disk_groups_to_cpu(c);
if (ret)
return ret;
bch2_sb_update(c);
return 0;
}
int bch2_sb_from_fs(struct bch_fs *c, struct bch_dev *ca)
{
return __copy_super(&ca->disk_sb, c->disk_sb.sb);
}
/* read superblock: */
static int read_one_super(struct bch_sb_handle *sb, u64 offset, struct printbuf *err)
{
size_t bytes;
int ret;
reread:
bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
sb->bio->bi_iter.bi_sector = offset;
bch2_bio_map(sb->bio, sb->sb, sb->buffer_size);
ret = submit_bio_wait(sb->bio);
if (ret) {
prt_printf(err, "IO error: %i", ret);
return ret;
}
if (!uuid_equal(&sb->sb->magic, &BCACHE_MAGIC) &&
!uuid_equal(&sb->sb->magic, &BCHFS_MAGIC)) {
prt_str(err, "Not a bcachefs superblock (got magic ");
pr_uuid(err, sb->sb->magic.b);
prt_str(err, ")");
return -BCH_ERR_invalid_sb_magic;
}
ret = bch2_sb_compatible(sb->sb, err);
if (ret)
return ret;
bytes = vstruct_bytes(sb->sb);
u64 sb_size = 512ULL << min(BCH_SB_LAYOUT_SIZE_BITS_MAX, sb->sb->layout.sb_max_size_bits);
if (bytes > sb_size) {
prt_printf(err, "Invalid superblock: too big (got %zu bytes, layout max %llu)",
bytes, sb_size);
return -BCH_ERR_invalid_sb_too_big;
}
if (bytes > sb->buffer_size) {
ret = bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s));
if (ret)
return ret;
goto reread;
}
enum bch_csum_type csum_type = BCH_SB_CSUM_TYPE(sb->sb);
if (csum_type >= BCH_CSUM_NR) {
prt_printf(err, "unknown checksum type %llu", BCH_SB_CSUM_TYPE(sb->sb));
return -BCH_ERR_invalid_sb_csum_type;
}
/* XXX: verify MACs */
struct bch_csum csum = csum_vstruct(NULL, csum_type, null_nonce(), sb->sb);
if (bch2_crc_cmp(csum, sb->sb->csum)) {
bch2_csum_err_msg(err, csum_type, sb->sb->csum, csum);
return -BCH_ERR_invalid_sb_csum;
}
sb->seq = le64_to_cpu(sb->sb->seq);
return 0;
}
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 = 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) {
ret = -ENOMEM;
prt_printf(&err, "error allocating memory for sb_name");
goto err;
}
#ifndef __KERNEL__
if (opt_get(*opts, direct_io) == false)
sb->mode |= BLK_OPEN_BUFFERED;
#endif
if (!opt_get(*opts, noexcl))
sb->mode |= BLK_OPEN_EXCL;
if (!opt_get(*opts, nochanges))
sb->mode |= BLK_OPEN_WRITE;
sb->s_bdev_file = bdev_file_open_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops);
if (IS_ERR(sb->s_bdev_file) &&
PTR_ERR(sb->s_bdev_file) == -EACCES &&
opt_get(*opts, read_only)) {
sb->mode &= ~BLK_OPEN_WRITE;
sb->s_bdev_file = bdev_file_open_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops);
if (!IS_ERR(sb->s_bdev_file))
opt_set(*opts, nochanges, true);
}
if (IS_ERR(sb->s_bdev_file)) {
ret = PTR_ERR(sb->s_bdev_file);
prt_printf(&err, "error opening %s: %s", path, bch2_err_str(ret));
goto err;
}
sb->bdev = file_bdev(sb->s_bdev_file);
ret = bch2_sb_realloc(sb, 0);
if (ret) {
prt_printf(&err, "error allocating memory for superblock");
goto err;
}
if (bch2_fs_init_fault("read_super")) {
prt_printf(&err, "dynamic fault");
ret = -EFAULT;
goto err;
}
ret = read_one_super(sb, offset, &err);
if (!ret)
goto got_super;
if (opt_defined(*opts, sb))
goto err;
prt_printf(&err2, "bcachefs (%s): error reading default superblock: %s\n",
path, err.buf);
if (ret == -BCH_ERR_invalid_sb_magic && ignore_notbchfs_msg)
bch2_print_opts(opts, KERN_INFO "%s", err2.buf);
else
bch2_print_opts(opts, KERN_ERR "%s", err2.buf);
printbuf_exit(&err2);
printbuf_reset(&err);
/*
* Error reading primary superblock - read location of backup
* superblocks:
*/
bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
sb->bio->bi_iter.bi_sector = BCH_SB_LAYOUT_SECTOR;
/*
* use sb buffer to read layout, since sb buffer is page aligned but
* layout won't be:
*/
bch2_bio_map(sb->bio, sb->sb, sizeof(struct bch_sb_layout));
ret = submit_bio_wait(sb->bio);
if (ret) {
prt_printf(&err, "IO error: %i", ret);
goto err;
}
memcpy(&layout, sb->sb, sizeof(layout));
ret = validate_sb_layout(&layout, &err);
if (ret)
goto err;
for (i = layout.sb_offset;
i < layout.sb_offset + layout.nr_superblocks; i++) {
offset = le64_to_cpu(*i);
if (offset == opt_get(*opts, sb)) {
ret = -BCH_ERR_invalid;
continue;
}
ret = read_one_super(sb, offset, &err);
if (!ret)
goto got_super;
}
goto err;
got_super:
if (le16_to_cpu(sb->sb->block_size) << 9 <
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));
ret = -BCH_ERR_block_size_too_small;
goto err;
}
sb->have_layout = true;
ret = bch2_sb_validate(sb, 0, &err);
if (ret) {
bch2_print_opts(opts, KERN_ERR "bcachefs (%s): error validating superblock: %s\n",
path, err.buf);
goto err_no_print;
}
out:
printbuf_exit(&err);
return ret;
err:
bch2_print_opts(opts, 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)
{
struct bch_dev *ca = bio->bi_private;
/* XXX: return errors directly */
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;
closure_put(&ca->fs->sb_write);
percpu_ref_put(&ca->io_ref);
}
static void read_back_super(struct bch_fs *c, struct bch_dev *ca)
{
struct bch_sb *sb = ca->disk_sb.sb;
struct bio *bio = ca->disk_sb.bio;
bio_reset(bio, ca->disk_sb.bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
bio->bi_iter.bi_sector = le64_to_cpu(sb->layout.sb_offset[0]);
bio->bi_end_io = write_super_endio;
bio->bi_private = ca;
bch2_bio_map(bio, ca->sb_read_scratch, PAGE_SIZE);
this_cpu_add(ca->io_done->sectors[READ][BCH_DATA_sb],
bio_sectors(bio));
percpu_ref_get(&ca->io_ref);
closure_bio_submit(bio, &c->sb_write);
}
static void write_one_super(struct bch_fs *c, struct bch_dev *ca, unsigned idx)
{
struct bch_sb *sb = ca->disk_sb.sb;
struct bio *bio = ca->disk_sb.bio;
sb->offset = sb->layout.sb_offset[idx];
SET_BCH_SB_CSUM_TYPE(sb, bch2_csum_opt_to_type(c->opts.metadata_checksum, false));
sb->csum = csum_vstruct(c, BCH_SB_CSUM_TYPE(sb),
null_nonce(), sb);
bio_reset(bio, ca->disk_sb.bdev, REQ_OP_WRITE|REQ_SYNC|REQ_META);
bio->bi_iter.bi_sector = le64_to_cpu(sb->offset);
bio->bi_end_io = write_super_endio;
bio->bi_private = ca;
bch2_bio_map(bio, sb,
roundup((size_t) vstruct_bytes(sb),
bdev_logical_block_size(ca->disk_sb.bdev)));
this_cpu_add(ca->io_done->sectors[WRITE][BCH_DATA_sb],
bio_sectors(bio));
percpu_ref_get(&ca->io_ref);
closure_bio_submit(bio, &c->sb_write);
}
int bch2_write_super(struct bch_fs *c)
{
struct closure *cl = &c->sb_write;
struct printbuf err = PRINTBUF;
unsigned sb = 0, nr_wrote;
struct bch_devs_mask sb_written;
bool wrote, can_mount_without_written, can_mount_with_written;
unsigned degraded_flags = BCH_FORCE_IF_DEGRADED;
DARRAY(struct bch_dev *) online_devices = {};
int ret = 0;
trace_and_count(c, write_super, c, _RET_IP_);
if (c->opts.very_degraded)
degraded_flags |= BCH_FORCE_IF_LOST;
lockdep_assert_held(&c->sb_lock);
closure_init_stack(cl);
memset(&sb_written, 0, sizeof(sb_written));
for_each_online_member(c, ca) {
ret = darray_push(&online_devices, ca);
if (bch2_fs_fatal_err_on(ret, c, "%s: error allocating online devices", __func__)) {
percpu_ref_put(&ca->io_ref);
goto out;
}
percpu_ref_get(&ca->io_ref);
}
/* 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);
struct bch_sb_field_members_v2 *mi = bch2_sb_field_get(c->disk_sb.sb, members_v2);
darray_for_each(online_devices, ca)
__bch2_members_v2_get_mut(mi, (*ca)->dev_idx)->seq = c->disk_sb.sb->seq;
c->disk_sb.sb->write_time = cpu_to_le64(ktime_get_real_seconds());
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))
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);
bch2_sb_downgrade_update(c);
darray_for_each(online_devices, ca)
bch2_sb_from_fs(c, (*ca));
darray_for_each(online_devices, ca) {
printbuf_reset(&err);
ret = bch2_sb_validate(&(*ca)->disk_sb, BCH_VALIDATE_write, &err);
if (ret) {
bch2_fs_inconsistent(c, "sb invalid before write: %s", err.buf);
goto out;
}
}
if (c->opts.nochanges)
goto out;
/*
* Defer writing the superblock until filesystem initialization is
* complete - don't write out a partly initialized superblock:
*/
if (!BCH_SB_INITIALIZED(c->disk_sb.sb))
goto out;
if (le16_to_cpu(c->disk_sb.sb->version) > bcachefs_metadata_version_current) {
struct printbuf buf = PRINTBUF;
prt_printf(&buf, "attempting to write superblock that wasn't version downgraded (");
bch2_version_to_text(&buf, le16_to_cpu(c->disk_sb.sb->version));
prt_str(&buf, " > ");
bch2_version_to_text(&buf, bcachefs_metadata_version_current);
prt_str(&buf, ")");
bch2_fs_fatal_error(c, ": %s", buf.buf);
printbuf_exit(&buf);
return -BCH_ERR_sb_not_downgraded;
}
darray_for_each(online_devices, ca) {
__set_bit((*ca)->dev_idx, sb_written.d);
(*ca)->sb_write_error = 0;
}
darray_for_each(online_devices, ca)
read_back_super(c, *ca);
closure_sync(cl);
darray_for_each(online_devices, cap) {
struct bch_dev *ca = *cap;
if (ca->sb_write_error)
continue;
if (le64_to_cpu(ca->sb_read_scratch->seq) < ca->disk_sb.seq) {
struct printbuf buf = PRINTBUF;
prt_char(&buf, ' ');
prt_bdevname(&buf, ca->disk_sb.bdev);
prt_printf(&buf,
": Superblock write was silently dropped! (seq %llu expected %llu)",
le64_to_cpu(ca->sb_read_scratch->seq),
ca->disk_sb.seq);
bch2_fs_fatal_error(c, "%s", buf.buf);
printbuf_exit(&buf);
ret = -BCH_ERR_erofs_sb_err;
}
if (le64_to_cpu(ca->sb_read_scratch->seq) > ca->disk_sb.seq) {
struct printbuf buf = PRINTBUF;
prt_char(&buf, ' ');
prt_bdevname(&buf, ca->disk_sb.bdev);
prt_printf(&buf,
": Superblock modified by another process (seq %llu expected %llu)",
le64_to_cpu(ca->sb_read_scratch->seq),
ca->disk_sb.seq);
bch2_fs_fatal_error(c, "%s", buf.buf);
printbuf_exit(&buf);
ret = -BCH_ERR_erofs_sb_err;
}
}
if (ret)
goto out;
do {
wrote = false;
darray_for_each(online_devices, cap) {
struct bch_dev *ca = *cap;
if (!ca->sb_write_error &&
sb < ca->disk_sb.sb->layout.nr_superblocks) {
write_one_super(c, ca, sb);
wrote = true;
}
}
closure_sync(cl);
sb++;
} while (wrote);
darray_for_each(online_devices, cap) {
struct bch_dev *ca = *cap;
if (ca->sb_write_error)
__clear_bit(ca->dev_idx, sb_written.d);
else
ca->disk_sb.seq = le64_to_cpu(ca->disk_sb.sb->seq);
}
nr_wrote = dev_mask_nr(&sb_written);
can_mount_with_written =
bch2_have_enough_devs(c, sb_written, degraded_flags, false);
for (unsigned i = 0; i < ARRAY_SIZE(sb_written.d); i++)
sb_written.d[i] = ~sb_written.d[i];
can_mount_without_written =
bch2_have_enough_devs(c, sb_written, degraded_flags, false);
/*
* If we would be able to mount _without_ the devices we successfully
* wrote superblocks to, we weren't able to write to enough devices:
*
* Exception: if we can mount without the successes because we haven't
* written anything (new filesystem), we continue if we'd be able to
* mount with the devices we did successfully write to:
*/
if (bch2_fs_fatal_err_on(!nr_wrote ||
!can_mount_with_written ||
(can_mount_without_written &&
!can_mount_with_written), c,
": Unable to write superblock to sufficient devices (from %ps)",
(void *) _RET_IP_))
ret = -1;
out:
/* Make new options visible after they're persistent: */
bch2_sb_update(c);
darray_for_each(online_devices, ca)
percpu_ref_put(&(*ca)->io_ref);
darray_exit(&online_devices);
printbuf_exit(&err);
return ret;
}
void __bch2_check_set_feature(struct bch_fs *c, unsigned feat)
{
mutex_lock(&c->sb_lock);
if (!(c->sb.features & (1ULL << feat))) {
c->disk_sb.sb->features[0] |= cpu_to_le64(1ULL << feat);
bch2_write_super(c);
}
mutex_unlock(&c->sb_lock);
}
/* Downgrade if superblock is at a higher version than currently supported: */
bool bch2_check_version_downgrade(struct bch_fs *c)
{
bool ret = bcachefs_metadata_version_current < c->sb.version;
lockdep_assert_held(&c->sb_lock);
/*
* Downgrade, if superblock is at a higher version than currently
* supported:
*
* c->sb will be checked before we write the superblock, so update it as
* well:
*/
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 (c->sb.version > bcachefs_metadata_version_current)
c->disk_sb.sb->version = cpu_to_le16(bcachefs_metadata_version_current);
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);
return ret;
}
void bch2_sb_upgrade(struct bch_fs *c, unsigned new_version)
{
lockdep_assert_held(&c->sb_lock);
if (BCH_VERSION_MAJOR(new_version) >
BCH_VERSION_MAJOR(le16_to_cpu(c->disk_sb.sb->version)))
bch2_sb_field_resize(&c->disk_sb, downgrade, 0);
c->disk_sb.sb->version = cpu_to_le16(new_version);
c->disk_sb.sb->features[0] |= cpu_to_le64(BCH_SB_FEATURES_ALL);
}
static int bch2_sb_ext_validate(struct bch_sb *sb, struct bch_sb_field *f,
enum bch_validate_flags flags, struct printbuf *err)
{
if (vstruct_bytes(f) < 88) {
prt_printf(err, "field too small (%zu < %u)", vstruct_bytes(f), 88);
return -BCH_ERR_invalid_sb_ext;
}
return 0;
}
static void bch2_sb_ext_to_text(struct printbuf *out, struct bch_sb *sb,
struct bch_sb_field *f)
{
struct bch_sb_field_ext *e = field_to_type(f, ext);
prt_printf(out, "Recovery passes required:\t");
prt_bitflags(out, bch2_recovery_passes,
bch2_recovery_passes_from_stable(le64_to_cpu(e->recovery_passes_required[0])));
prt_newline(out);
unsigned long *errors_silent = kmalloc(sizeof(e->errors_silent), GFP_KERNEL);
if (errors_silent) {
le_bitvector_to_cpu(errors_silent, (void *) e->errors_silent, sizeof(e->errors_silent) * 8);
prt_printf(out, "Errors to silently fix:\t");
prt_bitflags_vector(out, bch2_sb_error_strs, errors_silent,
min(BCH_FSCK_ERR_MAX, sizeof(e->errors_silent) * 8));
prt_newline(out);
kfree(errors_silent);
}
prt_printf(out, "Btrees with missing data:\t");
prt_bitflags(out, __bch2_btree_ids, le64_to_cpu(e->btrees_lost_data));
prt_newline(out);
}
static const struct bch_sb_field_ops bch_sb_field_ops_ext = {
.validate = bch2_sb_ext_validate,
.to_text = bch2_sb_ext_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,
BCH_SB_FIELDS()
#undef x
};
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)
{
return likely(type < ARRAY_SIZE(bch2_sb_field_ops))
? bch2_sb_field_ops[type]
: &bch2_sb_field_null_ops;
}
static int bch2_sb_field_validate(struct bch_sb *sb, struct bch_sb_field *f,
enum bch_validate_flags flags, struct printbuf *err)
{
unsigned type = le32_to_cpu(f->type);
struct printbuf field_err = PRINTBUF;
const struct bch_sb_field_ops *ops = bch2_sb_field_type_ops(type);
int ret;
ret = ops->validate ? ops->validate(sb, f, flags, &field_err) : 0;
if (ret) {
prt_printf(err, "Invalid superblock section %s: %s",
bch2_sb_fields[type], field_err.buf);
prt_newline(err);
bch2_sb_field_to_text(err, sb, f);
}
printbuf_exit(&field_err);
return ret;
}
void __bch2_sb_field_to_text(struct printbuf *out, struct bch_sb *sb,
struct bch_sb_field *f)
{
unsigned type = le32_to_cpu(f->type);
const struct bch_sb_field_ops *ops = bch2_sb_field_type_ops(type);
if (!out->nr_tabstops)
printbuf_tabstop_push(out, 32);
if (ops->to_text)
ops->to_text(out, sb, f);
}
void bch2_sb_field_to_text(struct printbuf *out, struct bch_sb *sb,
struct bch_sb_field *f)
{
unsigned type = le32_to_cpu(f->type);
if (type < BCH_SB_FIELD_NR)
prt_printf(out, "%s", bch2_sb_fields[type]);
else
prt_printf(out, "(unknown field %u)", type);
prt_printf(out, " (size %zu):", vstruct_bytes(f));
prt_newline(out);
__bch2_sb_field_to_text(out, sb, f);
}
void bch2_sb_layout_to_text(struct printbuf *out, struct bch_sb_layout *l)
{
unsigned i;
prt_printf(out, "Type: %u", l->layout_type);
prt_newline(out);
prt_str(out, "Superblock max size: ");
prt_units_u64(out, 512 << l->sb_max_size_bits);
prt_newline(out);
prt_printf(out, "Nr superblocks: %u", l->nr_superblocks);
prt_newline(out);
prt_str(out, "Offsets: ");
for (i = 0; i < l->nr_superblocks; i++) {
if (i)
prt_str(out, ", ");
prt_printf(out, "%llu", le64_to_cpu(l->sb_offset[i]));
}
prt_newline(out);
}
void bch2_sb_to_text(struct printbuf *out, struct bch_sb *sb,
bool print_layout, unsigned fields)
{
if (!out->nr_tabstops)
printbuf_tabstop_push(out, 44);
prt_printf(out, "External UUID:\t");
pr_uuid(out, sb->user_uuid.b);
prt_newline(out);
prt_printf(out, "Internal UUID:\t");
pr_uuid(out, sb->uuid.b);
prt_newline(out);
prt_printf(out, "Magic number:\t");
pr_uuid(out, sb->magic.b);
prt_newline(out);
prt_printf(out, "Device index:\t%u\n", sb->dev_idx);
prt_printf(out, "Label:\t");
if (!strlen(sb->label))
prt_printf(out, "(none)");
else
prt_printf(out, "%.*s", (int) sizeof(sb->label), sb->label);
prt_newline(out);
prt_printf(out, "Version:\t");
bch2_version_to_text(out, le16_to_cpu(sb->version));
prt_newline(out);
prt_printf(out, "Version upgrade complete:\t");
bch2_version_to_text(out, BCH_SB_VERSION_UPGRADE_COMPLETE(sb));
prt_newline(out);
prt_printf(out, "Oldest version on disk:\t");
bch2_version_to_text(out, le16_to_cpu(sb->version_min));
prt_newline(out);
prt_printf(out, "Created:\t");
if (sb->time_base_lo)
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);
prt_printf(out, "Sequence number:\t");
prt_printf(out, "%llu", le64_to_cpu(sb->seq));
prt_newline(out);
prt_printf(out, "Time of last write:\t");
bch2_prt_datetime(out, le64_to_cpu(sb->write_time));
prt_newline(out);
prt_printf(out, "Superblock size:\t");
prt_units_u64(out, vstruct_bytes(sb));
prt_str(out, "/");
prt_units_u64(out, 512ULL << sb->layout.sb_max_size_bits);
prt_newline(out);
prt_printf(out, "Clean:\t%llu\n", BCH_SB_CLEAN(sb));
prt_printf(out, "Devices:\t%u\n", bch2_sb_nr_devices(sb));
prt_printf(out, "Sections:\t");
u64 fields_have = 0;
vstruct_for_each(sb, f)
fields_have |= 1 << le32_to_cpu(f->type);
prt_bitflags(out, bch2_sb_fields, fields_have);
prt_newline(out);
prt_printf(out, "Features:\t");
prt_bitflags(out, bch2_sb_features, le64_to_cpu(sb->features[0]));
prt_newline(out);
prt_printf(out, "Compat features:\t");
prt_bitflags(out, bch2_sb_compat, le64_to_cpu(sb->compat[0]));
prt_newline(out);
prt_newline(out);
prt_printf(out, "Options:");
prt_newline(out);
printbuf_indent_add(out, 2);
{
enum bch_opt_id id;
for (id = 0; id < bch2_opts_nr; id++) {
const struct bch_option *opt = bch2_opt_table + id;
if (opt->get_sb != BCH2_NO_SB_OPT) {
u64 v = bch2_opt_from_sb(sb, id);
prt_printf(out, "%s:\t", opt->attr.name);
bch2_opt_to_text(out, NULL, sb, opt, v,
OPT_HUMAN_READABLE|OPT_SHOW_FULL_LIST);
prt_newline(out);
}
}
}
printbuf_indent_sub(out, 2);
if (print_layout) {
prt_newline(out);
prt_printf(out, "layout:");
prt_newline(out);
printbuf_indent_add(out, 2);
bch2_sb_layout_to_text(out, &sb->layout);
printbuf_indent_sub(out, 2);
}
vstruct_for_each(sb, f)
if (fields & (1 << le32_to_cpu(f->type))) {
prt_newline(out);
bch2_sb_field_to_text(out, sb, f);
}
}
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