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| 1 | +// SPDX-License-Identifier: GPL-2.0 |
| 2 | + |
| 3 | +/* |
| 4 | + * Superblock section that contains a list of recovery passes to run when |
| 5 | + * downgrading past a given version |
| 6 | + */ |
| 7 | + |
| 8 | +#include "bcachefs.h" |
| 9 | +#include "darray.h" |
| 10 | +#include "recovery.h" |
| 11 | +#include "sb-downgrade.h" |
| 12 | +#include "sb-errors.h" |
| 13 | +#include "super-io.h" |
| 14 | + |
| 15 | +/* |
| 16 | + * Downgrade table: |
| 17 | + * When dowgrading past certain versions, we need to run certain recovery passes |
| 18 | + * and fix certain errors: |
| 19 | + * |
| 20 | + * x(version, recovery_passes, errors...) |
| 21 | + */ |
| 22 | + |
| 23 | +#define DOWNGRADE_TABLE() |
| 24 | + |
| 25 | +struct downgrade_entry { |
| 26 | + u64 recovery_passes; |
| 27 | + u16 version; |
| 28 | + u16 nr_errors; |
| 29 | + const u16 *errors; |
| 30 | +}; |
| 31 | + |
| 32 | +#define x(ver, passes, ...) static const u16 ver_##errors[] = { __VA_ARGS__ }; |
| 33 | +DOWNGRADE_TABLE() |
| 34 | +#undef x |
| 35 | + |
| 36 | +static const struct downgrade_entry downgrade_table[] = { |
| 37 | +#define x(ver, passes, ...) { \ |
| 38 | + .recovery_passes = passes, \ |
| 39 | + .version = bcachefs_metadata_version_##ver,\ |
| 40 | + .nr_errors = ARRAY_SIZE(ver_##errors), \ |
| 41 | + .errors = ver_##errors, \ |
| 42 | +}, |
| 43 | +DOWNGRADE_TABLE() |
| 44 | +#undef x |
| 45 | +}; |
| 46 | + |
| 47 | +static inline const struct bch_sb_field_downgrade_entry * |
| 48 | +downgrade_entry_next_c(const struct bch_sb_field_downgrade_entry *e) |
| 49 | +{ |
| 50 | + return (void *) &e->errors[le16_to_cpu(e->nr_errors)]; |
| 51 | +} |
| 52 | + |
| 53 | +#define for_each_downgrade_entry(_d, _i) \ |
| 54 | + for (const struct bch_sb_field_downgrade_entry *_i = (_d)->entries; \ |
| 55 | + (void *) _i < vstruct_end(&(_d)->field) && \ |
| 56 | + (void *) &_i->errors[0] < vstruct_end(&(_d)->field); \ |
| 57 | + _i = downgrade_entry_next_c(_i)) |
| 58 | + |
| 59 | +static int bch2_sb_downgrade_validate(struct bch_sb *sb, struct bch_sb_field *f, |
| 60 | + struct printbuf *err) |
| 61 | +{ |
| 62 | + struct bch_sb_field_downgrade *e = field_to_type(f, downgrade); |
| 63 | + |
| 64 | + for_each_downgrade_entry(e, i) { |
| 65 | + if (BCH_VERSION_MAJOR(le16_to_cpu(i->version)) != |
| 66 | + BCH_VERSION_MAJOR(le16_to_cpu(sb->version))) { |
| 67 | + prt_printf(err, "downgrade entry with mismatched major version (%u != %u)", |
| 68 | + BCH_VERSION_MAJOR(le16_to_cpu(i->version)), |
| 69 | + BCH_VERSION_MAJOR(le16_to_cpu(sb->version))); |
| 70 | + return -BCH_ERR_invalid_sb_downgrade; |
| 71 | + } |
| 72 | + } |
| 73 | + |
| 74 | + return 0; |
| 75 | +} |
| 76 | + |
| 77 | +static void bch2_sb_downgrade_to_text(struct printbuf *out, struct bch_sb *sb, |
| 78 | + struct bch_sb_field *f) |
| 79 | +{ |
| 80 | + struct bch_sb_field_downgrade *e = field_to_type(f, downgrade); |
| 81 | + |
| 82 | + if (out->nr_tabstops <= 1) |
| 83 | + printbuf_tabstop_push(out, 16); |
| 84 | + |
| 85 | + for_each_downgrade_entry(e, i) { |
| 86 | + prt_str(out, "version:"); |
| 87 | + prt_tab(out); |
| 88 | + bch2_version_to_text(out, le16_to_cpu(i->version)); |
| 89 | + prt_newline(out); |
| 90 | + |
| 91 | + prt_str(out, "recovery passes:"); |
| 92 | + prt_tab(out); |
| 93 | + prt_bitflags(out, bch2_recovery_passes, |
| 94 | + bch2_recovery_passes_from_stable(le64_to_cpu(i->recovery_passes[0]))); |
| 95 | + prt_newline(out); |
| 96 | + |
| 97 | + prt_str(out, "errors:"); |
| 98 | + prt_tab(out); |
| 99 | + bool first = true; |
| 100 | + for (unsigned j = 0; j < le16_to_cpu(i->nr_errors); j++) { |
| 101 | + if (!first) |
| 102 | + prt_char(out, ','); |
| 103 | + first = false; |
| 104 | + unsigned e = le16_to_cpu(i->errors[j]); |
| 105 | + prt_str(out, e < BCH_SB_ERR_MAX ? bch2_sb_error_strs[e] : "(unknown)"); |
| 106 | + } |
| 107 | + prt_newline(out); |
| 108 | + } |
| 109 | +} |
| 110 | + |
| 111 | +const struct bch_sb_field_ops bch_sb_field_ops_downgrade = { |
| 112 | + .validate = bch2_sb_downgrade_validate, |
| 113 | + .to_text = bch2_sb_downgrade_to_text, |
| 114 | +}; |
| 115 | + |
| 116 | +int bch2_sb_downgrade_update(struct bch_fs *c) |
| 117 | +{ |
| 118 | + darray_char table = {}; |
| 119 | + int ret = 0; |
| 120 | + |
| 121 | + for (const struct downgrade_entry *src = downgrade_table; |
| 122 | + src < downgrade_table + ARRAY_SIZE(downgrade_table); |
| 123 | + src++) { |
| 124 | + if (BCH_VERSION_MAJOR(src->version) != BCH_VERSION_MAJOR(le16_to_cpu(c->disk_sb.sb->version))) |
| 125 | + continue; |
| 126 | + |
| 127 | + struct bch_sb_field_downgrade_entry *dst; |
| 128 | + unsigned bytes = sizeof(*dst) + sizeof(dst->errors[0]) * src->nr_errors; |
| 129 | + |
| 130 | + ret = darray_make_room(&table, bytes); |
| 131 | + if (ret) |
| 132 | + goto out; |
| 133 | + |
| 134 | + dst = (void *) &darray_top(table); |
| 135 | + dst->version = cpu_to_le16(src->version); |
| 136 | + dst->recovery_passes[0] = cpu_to_le64(src->recovery_passes); |
| 137 | + dst->recovery_passes[1] = 0; |
| 138 | + dst->nr_errors = cpu_to_le16(src->nr_errors); |
| 139 | + for (unsigned i = 0; i < src->nr_errors; i++) |
| 140 | + dst->errors[i] = cpu_to_le16(src->errors[i]); |
| 141 | + |
| 142 | + table.nr += bytes; |
| 143 | + } |
| 144 | + |
| 145 | + struct bch_sb_field_downgrade *d = bch2_sb_field_get(c->disk_sb.sb, downgrade); |
| 146 | + |
| 147 | + unsigned sb_u64s = DIV_ROUND_UP(sizeof(*d) + table.nr, sizeof(u64)); |
| 148 | + |
| 149 | + if (d && le32_to_cpu(d->field.u64s) > sb_u64s) |
| 150 | + goto out; |
| 151 | + |
| 152 | + d = bch2_sb_field_resize(&c->disk_sb, downgrade, sb_u64s); |
| 153 | + if (!d) { |
| 154 | + ret = -BCH_ERR_ENOSPC_sb_downgrade; |
| 155 | + goto out; |
| 156 | + } |
| 157 | + |
| 158 | + memcpy(d->entries, table.data, table.nr); |
| 159 | + memset_u64s_tail(d->entries, 0, table.nr); |
| 160 | +out: |
| 161 | + darray_exit(&table); |
| 162 | + return ret; |
| 163 | +} |
| 164 | + |
| 165 | +void bch2_sb_set_downgrade(struct bch_fs *c, unsigned new_minor, unsigned old_minor) |
| 166 | +{ |
| 167 | + struct bch_sb_field_downgrade *d = bch2_sb_field_get(c->disk_sb.sb, downgrade); |
| 168 | + if (!d) |
| 169 | + return; |
| 170 | + |
| 171 | + struct bch_sb_field_ext *ext = bch2_sb_field_get(c->disk_sb.sb, ext); |
| 172 | + |
| 173 | + for_each_downgrade_entry(d, i) { |
| 174 | + unsigned minor = BCH_VERSION_MINOR(le16_to_cpu(i->version)); |
| 175 | + if (new_minor < minor && minor <= old_minor) { |
| 176 | + ext->recovery_passes_required[0] |= i->recovery_passes[0]; |
| 177 | + ext->recovery_passes_required[1] |= i->recovery_passes[1]; |
| 178 | + |
| 179 | + for (unsigned j = 0; j < le16_to_cpu(i->nr_errors); j++) { |
| 180 | + unsigned e = le16_to_cpu(i->errors[j]); |
| 181 | + if (e < BCH_SB_ERR_MAX) |
| 182 | + __set_bit(e, c->sb.errors_silent); |
| 183 | + if (e < sizeof(ext->errors_silent) * 8) |
| 184 | + ext->errors_silent[e / 64] |= cpu_to_le64(BIT_ULL(e % 64)); |
| 185 | + } |
| 186 | + } |
| 187 | + } |
| 188 | +} |
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