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author | Kent Overstreet <kent.overstreet@linux.dev> | 2023-08-05 15:54:38 -0400 |
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committer | Kent Overstreet <kent.overstreet@linux.dev> | 2023-10-22 17:10:10 -0400 |
commit | a37ad1a3aba957b20c8c434a88c1724e49409eb3 (patch) | |
tree | 81fb09ffb8966e0d3f6add9444b44bfb7ded4ecb /fs/bcachefs/sb-clean.c | |
parent | 0ec3985694802bebbeb087165328810062e73130 (diff) | |
download | linux-a37ad1a3aba957b20c8c434a88c1724e49409eb3.tar.gz linux-a37ad1a3aba957b20c8c434a88c1724e49409eb3.tar.bz2 linux-a37ad1a3aba957b20c8c434a88c1724e49409eb3.zip |
bcachefs: sb-clean.c
Pull code for bch_sb_field_clean out into its own file.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'fs/bcachefs/sb-clean.c')
-rw-r--r-- | fs/bcachefs/sb-clean.c | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/fs/bcachefs/sb-clean.c b/fs/bcachefs/sb-clean.c new file mode 100644 index 000000000000..a3695e56a155 --- /dev/null +++ b/fs/bcachefs/sb-clean.c @@ -0,0 +1,395 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include "bcachefs.h" +#include "btree_update_interior.h" +#include "buckets.h" +#include "error.h" +#include "journal_io.h" +#include "replicas.h" +#include "sb-clean.h" +#include "super-io.h" + +/* + * BCH_SB_FIELD_clean: + * + * Btree roots, and a few other things, are recovered from the journal after an + * unclean shutdown - but after a clean shutdown, to avoid having to read the + * journal, we can store them in the superblock. + * + * bch_sb_field_clean simply contains a list of journal entries, stored exactly + * as they would be in the journal: + */ + +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; +} + +static struct bkey_i *btree_root_find(struct bch_fs *c, + struct bch_sb_field_clean *clean, + struct jset *j, + enum btree_id id, unsigned *level) +{ + struct bkey_i *k; + struct jset_entry *entry, *start, *end; + + if (clean) { + start = clean->start; + end = vstruct_end(&clean->field); + } else { + start = j->start; + end = vstruct_last(j); + } + + for (entry = start; entry < end; entry = vstruct_next(entry)) + if (entry->type == BCH_JSET_ENTRY_btree_root && + entry->btree_id == id) + goto found; + + return NULL; +found: + if (!entry->u64s) + return ERR_PTR(-EINVAL); + + k = entry->start; + *level = entry->level; + return k; +} + +int bch2_verify_superblock_clean(struct bch_fs *c, + struct bch_sb_field_clean **cleanp, + struct jset *j) +{ + unsigned i; + struct bch_sb_field_clean *clean = *cleanp; + struct printbuf buf1 = PRINTBUF; + struct printbuf buf2 = PRINTBUF; + int ret = 0; + + if (mustfix_fsck_err_on(j->seq != clean->journal_seq, c, + "superblock journal seq (%llu) doesn't match journal (%llu) after clean shutdown", + le64_to_cpu(clean->journal_seq), + le64_to_cpu(j->seq))) { + kfree(clean); + *cleanp = NULL; + return 0; + } + + for (i = 0; i < BTREE_ID_NR; i++) { + struct bkey_i *k1, *k2; + unsigned l1 = 0, l2 = 0; + + k1 = btree_root_find(c, clean, NULL, i, &l1); + k2 = btree_root_find(c, NULL, j, i, &l2); + + if (!k1 && !k2) + continue; + + printbuf_reset(&buf1); + printbuf_reset(&buf2); + + if (k1) + bch2_bkey_val_to_text(&buf1, c, bkey_i_to_s_c(k1)); + else + prt_printf(&buf1, "(none)"); + + if (k2) + bch2_bkey_val_to_text(&buf2, c, bkey_i_to_s_c(k2)); + else + prt_printf(&buf2, "(none)"); + + mustfix_fsck_err_on(!k1 || !k2 || + IS_ERR(k1) || + IS_ERR(k2) || + k1->k.u64s != k2->k.u64s || + memcmp(k1, k2, bkey_bytes(&k1->k)) || + l1 != l2, c, + "superblock btree root %u doesn't match journal after clean shutdown\n" + "sb: l=%u %s\n" + "journal: l=%u %s\n", i, + l1, buf1.buf, + l2, buf2.buf); + } +fsck_err: + printbuf_exit(&buf2); + printbuf_exit(&buf1); + return ret; +} + +struct bch_sb_field_clean *bch2_read_superblock_clean(struct bch_fs *c) +{ + struct bch_sb_field_clean *clean, *sb_clean; + int ret; + + mutex_lock(&c->sb_lock); + sb_clean = bch2_sb_get_clean(c->disk_sb.sb); + + if (fsck_err_on(!sb_clean, c, + "superblock marked clean but clean section not present")) { + SET_BCH_SB_CLEAN(c->disk_sb.sb, false); + c->sb.clean = false; + mutex_unlock(&c->sb_lock); + return NULL; + } + + clean = kmemdup(sb_clean, vstruct_bytes(&sb_clean->field), + GFP_KERNEL); + if (!clean) { + mutex_unlock(&c->sb_lock); + return ERR_PTR(-BCH_ERR_ENOMEM_read_superblock_clean); + } + + ret = bch2_sb_clean_validate_late(c, clean, READ); + if (ret) { + mutex_unlock(&c->sb_lock); + return ERR_PTR(ret); + } + + mutex_unlock(&c->sb_lock); + + return clean; +fsck_err: + mutex_unlock(&c->sb_lock); + return ERR_PTR(ret); +} + +static struct jset_entry *jset_entry_init(struct jset_entry **end, size_t size) +{ + 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)); + } +} + +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; + + bch2_journal_entry_to_text(out, NULL, entry); + prt_newline(out); + } +} + +const struct bch_sb_field_ops bch_sb_field_ops_clean = { + .validate = bch2_sb_clean_validate, + .to_text = bch2_sb_clean_to_text, +}; + +int bch2_fs_mark_dirty(struct bch_fs *c) +{ + int ret; + + /* + * Unconditionally write superblock, to verify it hasn't changed before + * we go rw: + */ + + mutex_lock(&c->sb_lock); + SET_BCH_SB_CLEAN(c->disk_sb.sb, false); + + bch2_sb_maybe_downgrade(c); + c->disk_sb.sb->features[0] |= cpu_to_le64(BCH_SB_FEATURES_ALWAYS); + + ret = bch2_write_super(c); + mutex_unlock(&c->sb_lock); + + return ret; +} + +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); +} |