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// SPDX-License-Identifier: GPL-2.0
/*
* Superblock section that contains a list of recovery passes to run when
* downgrading past a given version
*/
#include "bcachefs.h"
#include "darray.h"
#include "recovery.h"
#include "sb-downgrade.h"
#include "sb-errors.h"
#include "super-io.h"
/*
* Downgrade table:
* When dowgrading past certain versions, we need to run certain recovery passes
* and fix certain errors:
*
* x(version, recovery_passes, errors...)
*/
#define DOWNGRADE_TABLE()
struct downgrade_entry {
u64 recovery_passes;
u16 version;
u16 nr_errors;
const u16 *errors;
};
#define x(ver, passes, ...) static const u16 ver_##errors[] = { __VA_ARGS__ };
DOWNGRADE_TABLE()
#undef x
static const struct downgrade_entry downgrade_table[] = {
#define x(ver, passes, ...) { \
.recovery_passes = passes, \
.version = bcachefs_metadata_version_##ver,\
.nr_errors = ARRAY_SIZE(ver_##errors), \
.errors = ver_##errors, \
},
DOWNGRADE_TABLE()
#undef x
};
static inline const struct bch_sb_field_downgrade_entry *
downgrade_entry_next_c(const struct bch_sb_field_downgrade_entry *e)
{
return (void *) &e->errors[le16_to_cpu(e->nr_errors)];
}
#define for_each_downgrade_entry(_d, _i) \
for (const struct bch_sb_field_downgrade_entry *_i = (_d)->entries; \
(void *) _i < vstruct_end(&(_d)->field) && \
(void *) &_i->errors[0] < vstruct_end(&(_d)->field); \
_i = downgrade_entry_next_c(_i))
static int bch2_sb_downgrade_validate(struct bch_sb *sb, struct bch_sb_field *f,
struct printbuf *err)
{
struct bch_sb_field_downgrade *e = field_to_type(f, downgrade);
for_each_downgrade_entry(e, i) {
if (BCH_VERSION_MAJOR(le16_to_cpu(i->version)) !=
BCH_VERSION_MAJOR(le16_to_cpu(sb->version))) {
prt_printf(err, "downgrade entry with mismatched major version (%u != %u)",
BCH_VERSION_MAJOR(le16_to_cpu(i->version)),
BCH_VERSION_MAJOR(le16_to_cpu(sb->version)));
return -BCH_ERR_invalid_sb_downgrade;
}
}
return 0;
}
static void bch2_sb_downgrade_to_text(struct printbuf *out, struct bch_sb *sb,
struct bch_sb_field *f)
{
struct bch_sb_field_downgrade *e = field_to_type(f, downgrade);
if (out->nr_tabstops <= 1)
printbuf_tabstop_push(out, 16);
for_each_downgrade_entry(e, i) {
prt_str(out, "version:");
prt_tab(out);
bch2_version_to_text(out, le16_to_cpu(i->version));
prt_newline(out);
prt_str(out, "recovery passes:");
prt_tab(out);
prt_bitflags(out, bch2_recovery_passes,
bch2_recovery_passes_from_stable(le64_to_cpu(i->recovery_passes[0])));
prt_newline(out);
prt_str(out, "errors:");
prt_tab(out);
bool first = true;
for (unsigned j = 0; j < le16_to_cpu(i->nr_errors); j++) {
if (!first)
prt_char(out, ',');
first = false;
unsigned e = le16_to_cpu(i->errors[j]);
prt_str(out, e < BCH_SB_ERR_MAX ? bch2_sb_error_strs[e] : "(unknown)");
}
prt_newline(out);
}
}
const struct bch_sb_field_ops bch_sb_field_ops_downgrade = {
.validate = bch2_sb_downgrade_validate,
.to_text = bch2_sb_downgrade_to_text,
};
int bch2_sb_downgrade_update(struct bch_fs *c)
{
darray_char table = {};
int ret = 0;
for (const struct downgrade_entry *src = downgrade_table;
src < downgrade_table + ARRAY_SIZE(downgrade_table);
src++) {
if (BCH_VERSION_MAJOR(src->version) != BCH_VERSION_MAJOR(le16_to_cpu(c->disk_sb.sb->version)))
continue;
struct bch_sb_field_downgrade_entry *dst;
unsigned bytes = sizeof(*dst) + sizeof(dst->errors[0]) * src->nr_errors;
ret = darray_make_room(&table, bytes);
if (ret)
goto out;
dst = (void *) &darray_top(table);
dst->version = cpu_to_le16(src->version);
dst->recovery_passes[0] = cpu_to_le64(src->recovery_passes);
dst->recovery_passes[1] = 0;
dst->nr_errors = cpu_to_le16(src->nr_errors);
for (unsigned i = 0; i < src->nr_errors; i++)
dst->errors[i] = cpu_to_le16(src->errors[i]);
table.nr += bytes;
}
struct bch_sb_field_downgrade *d = bch2_sb_field_get(c->disk_sb.sb, downgrade);
unsigned sb_u64s = DIV_ROUND_UP(sizeof(*d) + table.nr, sizeof(u64));
if (d && le32_to_cpu(d->field.u64s) > sb_u64s)
goto out;
d = bch2_sb_field_resize(&c->disk_sb, downgrade, sb_u64s);
if (!d) {
ret = -BCH_ERR_ENOSPC_sb_downgrade;
goto out;
}
memcpy(d->entries, table.data, table.nr);
memset_u64s_tail(d->entries, 0, table.nr);
out:
darray_exit(&table);
return ret;
}
void bch2_sb_set_downgrade(struct bch_fs *c, unsigned new_minor, unsigned old_minor)
{
struct bch_sb_field_downgrade *d = bch2_sb_field_get(c->disk_sb.sb, downgrade);
if (!d)
return;
struct bch_sb_field_ext *ext = bch2_sb_field_get(c->disk_sb.sb, ext);
for_each_downgrade_entry(d, i) {
unsigned minor = BCH_VERSION_MINOR(le16_to_cpu(i->version));
if (new_minor < minor && minor <= old_minor) {
ext->recovery_passes_required[0] |= i->recovery_passes[0];
ext->recovery_passes_required[1] |= i->recovery_passes[1];
for (unsigned j = 0; j < le16_to_cpu(i->nr_errors); j++) {
unsigned e = le16_to_cpu(i->errors[j]);
if (e < BCH_SB_ERR_MAX)
__set_bit(e, c->sb.errors_silent);
if (e < sizeof(ext->errors_silent) * 8)
ext->errors_silent[e / 64] |= cpu_to_le64(BIT_ULL(e % 64));
}
}
}
}
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