diff options
Diffstat (limited to 'c_src/libbcachefs/journal_io.c')
| -rw-r--r-- | c_src/libbcachefs/journal_io.c | 2009 |
1 files changed, 2009 insertions, 0 deletions
diff --git a/c_src/libbcachefs/journal_io.c b/c_src/libbcachefs/journal_io.c new file mode 100644 index 00000000..b0f4dd49 --- /dev/null +++ b/c_src/libbcachefs/journal_io.c @@ -0,0 +1,2009 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "bcachefs.h" +#include "alloc_background.h" +#include "alloc_foreground.h" +#include "btree_io.h" +#include "btree_update_interior.h" +#include "btree_write_buffer.h" +#include "buckets.h" +#include "checksum.h" +#include "disk_groups.h" +#include "error.h" +#include "journal.h" +#include "journal_io.h" +#include "journal_reclaim.h" +#include "journal_seq_blacklist.h" +#include "replicas.h" +#include "sb-clean.h" +#include "trace.h" + +static struct nonce journal_nonce(const struct jset *jset) +{ + return (struct nonce) {{ + [0] = 0, + [1] = ((__le32 *) &jset->seq)[0], + [2] = ((__le32 *) &jset->seq)[1], + [3] = BCH_NONCE_JOURNAL, + }}; +} + +static bool jset_csum_good(struct bch_fs *c, struct jset *j, struct bch_csum *csum) +{ + if (!bch2_checksum_type_valid(c, JSET_CSUM_TYPE(j))) { + *csum = (struct bch_csum) {}; + return false; + } + + *csum = csum_vstruct(c, JSET_CSUM_TYPE(j), journal_nonce(j), j); + return !bch2_crc_cmp(j->csum, *csum); +} + +static inline u32 journal_entry_radix_idx(struct bch_fs *c, u64 seq) +{ + return (seq - c->journal_entries_base_seq) & (~0U >> 1); +} + +static void __journal_replay_free(struct bch_fs *c, + struct journal_replay *i) +{ + struct journal_replay **p = + genradix_ptr(&c->journal_entries, + journal_entry_radix_idx(c, le64_to_cpu(i->j.seq))); + + BUG_ON(*p != i); + *p = NULL; + kvpfree(i, offsetof(struct journal_replay, j) + + vstruct_bytes(&i->j)); +} + +static void journal_replay_free(struct bch_fs *c, struct journal_replay *i) +{ + i->ignore = true; + + if (!c->opts.read_entire_journal) + __journal_replay_free(c, i); +} + +struct journal_list { + struct closure cl; + u64 last_seq; + struct mutex lock; + int ret; +}; + +#define JOURNAL_ENTRY_ADD_OK 0 +#define JOURNAL_ENTRY_ADD_OUT_OF_RANGE 5 + +/* + * Given a journal entry we just read, add it to the list of journal entries to + * be replayed: + */ +static int journal_entry_add(struct bch_fs *c, struct bch_dev *ca, + struct journal_ptr entry_ptr, + struct journal_list *jlist, struct jset *j) +{ + struct genradix_iter iter; + struct journal_replay **_i, *i, *dup; + struct journal_ptr *ptr; + size_t bytes = vstruct_bytes(j); + u64 last_seq = !JSET_NO_FLUSH(j) ? le64_to_cpu(j->last_seq) : 0; + int ret = JOURNAL_ENTRY_ADD_OK; + + /* Is this entry older than the range we need? */ + if (!c->opts.read_entire_journal && + le64_to_cpu(j->seq) < jlist->last_seq) + return JOURNAL_ENTRY_ADD_OUT_OF_RANGE; + + /* + * genradixes are indexed by a ulong, not a u64, so we can't index them + * by sequence number directly: Assume instead that they will all fall + * within the range of +-2billion of the filrst one we find. + */ + if (!c->journal_entries_base_seq) + c->journal_entries_base_seq = max_t(s64, 1, le64_to_cpu(j->seq) - S32_MAX); + + /* Drop entries we don't need anymore */ + if (last_seq > jlist->last_seq && !c->opts.read_entire_journal) { + genradix_for_each_from(&c->journal_entries, iter, _i, + journal_entry_radix_idx(c, jlist->last_seq)) { + i = *_i; + + if (!i || i->ignore) + continue; + + if (le64_to_cpu(i->j.seq) >= last_seq) + break; + journal_replay_free(c, i); + } + } + + jlist->last_seq = max(jlist->last_seq, last_seq); + + _i = genradix_ptr_alloc(&c->journal_entries, + journal_entry_radix_idx(c, le64_to_cpu(j->seq)), + GFP_KERNEL); + if (!_i) + return -BCH_ERR_ENOMEM_journal_entry_add; + + /* + * Duplicate journal entries? If so we want the one that didn't have a + * checksum error: + */ + dup = *_i; + if (dup) { + if (bytes == vstruct_bytes(&dup->j) && + !memcmp(j, &dup->j, bytes)) { + i = dup; + goto found; + } + + if (!entry_ptr.csum_good) { + i = dup; + goto found; + } + + if (!dup->csum_good) + goto replace; + + fsck_err(c, journal_entry_replicas_data_mismatch, + "found duplicate but non identical journal entries (seq %llu)", + le64_to_cpu(j->seq)); + i = dup; + goto found; + } +replace: + i = kvpmalloc(offsetof(struct journal_replay, j) + bytes, GFP_KERNEL); + if (!i) + return -BCH_ERR_ENOMEM_journal_entry_add; + + i->nr_ptrs = 0; + i->csum_good = entry_ptr.csum_good; + i->ignore = false; + unsafe_memcpy(&i->j, j, bytes, "embedded variable length struct"); + i->ptrs[i->nr_ptrs++] = entry_ptr; + + if (dup) { + if (dup->nr_ptrs >= ARRAY_SIZE(dup->ptrs)) { + bch_err(c, "found too many copies of journal entry %llu", + le64_to_cpu(i->j.seq)); + dup->nr_ptrs = ARRAY_SIZE(dup->ptrs) - 1; + } + + /* The first ptr should represent the jset we kept: */ + memcpy(i->ptrs + i->nr_ptrs, + dup->ptrs, + sizeof(dup->ptrs[0]) * dup->nr_ptrs); + i->nr_ptrs += dup->nr_ptrs; + __journal_replay_free(c, dup); + } + + *_i = i; + return 0; +found: + for (ptr = i->ptrs; ptr < i->ptrs + i->nr_ptrs; ptr++) { + if (ptr->dev == ca->dev_idx) { + bch_err(c, "duplicate journal entry %llu on same device", + le64_to_cpu(i->j.seq)); + goto out; + } + } + + if (i->nr_ptrs >= ARRAY_SIZE(i->ptrs)) { + bch_err(c, "found too many copies of journal entry %llu", + le64_to_cpu(i->j.seq)); + goto out; + } + + i->ptrs[i->nr_ptrs++] = entry_ptr; +out: +fsck_err: + return ret; +} + +/* this fills in a range with empty jset_entries: */ +static void journal_entry_null_range(void *start, void *end) +{ + struct jset_entry *entry; + + for (entry = start; entry != end; entry = vstruct_next(entry)) + memset(entry, 0, sizeof(*entry)); +} + +#define JOURNAL_ENTRY_REREAD 5 +#define JOURNAL_ENTRY_NONE 6 +#define JOURNAL_ENTRY_BAD 7 + +static void journal_entry_err_msg(struct printbuf *out, + u32 version, + struct jset *jset, + struct jset_entry *entry) +{ + prt_str(out, "invalid journal entry, version="); + bch2_version_to_text(out, version); + + if (entry) { + prt_str(out, " type="); + prt_str(out, bch2_jset_entry_types[entry->type]); + } + + if (!jset) { + prt_printf(out, " in superblock"); + } else { + + prt_printf(out, " seq=%llu", le64_to_cpu(jset->seq)); + + if (entry) + prt_printf(out, " offset=%zi/%u", + (u64 *) entry - jset->_data, + le32_to_cpu(jset->u64s)); + } + + prt_str(out, ": "); +} + +#define journal_entry_err(c, version, jset, entry, _err, msg, ...) \ +({ \ + struct printbuf _buf = PRINTBUF; \ + \ + journal_entry_err_msg(&_buf, version, jset, entry); \ + prt_printf(&_buf, msg, ##__VA_ARGS__); \ + \ + switch (flags & BKEY_INVALID_WRITE) { \ + case READ: \ + mustfix_fsck_err(c, _err, "%s", _buf.buf); \ + break; \ + case WRITE: \ + bch2_sb_error_count(c, BCH_FSCK_ERR_##_err); \ + bch_err(c, "corrupt metadata before write: %s\n", _buf.buf);\ + if (bch2_fs_inconsistent(c)) { \ + ret = -BCH_ERR_fsck_errors_not_fixed; \ + goto fsck_err; \ + } \ + break; \ + } \ + \ + printbuf_exit(&_buf); \ + true; \ +}) + +#define journal_entry_err_on(cond, ...) \ + ((cond) ? journal_entry_err(__VA_ARGS__) : false) + +#define FSCK_DELETED_KEY 5 + +static int journal_validate_key(struct bch_fs *c, + struct jset *jset, + struct jset_entry *entry, + unsigned level, enum btree_id btree_id, + struct bkey_i *k, + unsigned version, int big_endian, + enum bkey_invalid_flags flags) +{ + int write = flags & BKEY_INVALID_WRITE; + void *next = vstruct_next(entry); + struct printbuf buf = PRINTBUF; + int ret = 0; + + if (journal_entry_err_on(!k->k.u64s, + c, version, jset, entry, + journal_entry_bkey_u64s_0, + "k->u64s 0")) { + entry->u64s = cpu_to_le16((u64 *) k - entry->_data); + journal_entry_null_range(vstruct_next(entry), next); + return FSCK_DELETED_KEY; + } + + if (journal_entry_err_on((void *) bkey_next(k) > + (void *) vstruct_next(entry), + c, version, jset, entry, + journal_entry_bkey_past_end, + "extends past end of journal entry")) { + entry->u64s = cpu_to_le16((u64 *) k - entry->_data); + journal_entry_null_range(vstruct_next(entry), next); + return FSCK_DELETED_KEY; + } + + if (journal_entry_err_on(k->k.format != KEY_FORMAT_CURRENT, + c, version, jset, entry, + journal_entry_bkey_bad_format, + "bad format %u", k->k.format)) { + le16_add_cpu(&entry->u64s, -((u16) k->k.u64s)); + memmove(k, bkey_next(k), next - (void *) bkey_next(k)); + journal_entry_null_range(vstruct_next(entry), next); + return FSCK_DELETED_KEY; + } + + if (!write) + bch2_bkey_compat(level, btree_id, version, big_endian, + write, NULL, bkey_to_packed(k)); + + if (bch2_bkey_invalid(c, bkey_i_to_s_c(k), + __btree_node_type(level, btree_id), write, &buf)) { + printbuf_reset(&buf); + journal_entry_err_msg(&buf, version, jset, entry); + prt_newline(&buf); + printbuf_indent_add(&buf, 2); + + bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(k)); + prt_newline(&buf); + bch2_bkey_invalid(c, bkey_i_to_s_c(k), + __btree_node_type(level, btree_id), write, &buf); + + mustfix_fsck_err(c, journal_entry_bkey_invalid, + "%s", buf.buf); + + le16_add_cpu(&entry->u64s, -((u16) k->k.u64s)); + memmove(k, bkey_next(k), next - (void *) bkey_next(k)); + journal_entry_null_range(vstruct_next(entry), next); + + printbuf_exit(&buf); + return FSCK_DELETED_KEY; + } + + if (write) + bch2_bkey_compat(level, btree_id, version, big_endian, + write, NULL, bkey_to_packed(k)); +fsck_err: + printbuf_exit(&buf); + return ret; +} + +static int journal_entry_btree_keys_validate(struct bch_fs *c, + struct jset *jset, + struct jset_entry *entry, + unsigned version, int big_endian, + enum bkey_invalid_flags flags) +{ + struct bkey_i *k = entry->start; + + while (k != vstruct_last(entry)) { + int ret = journal_validate_key(c, jset, entry, + entry->level, + entry->btree_id, + k, version, big_endian, + flags|BKEY_INVALID_JOURNAL); + if (ret == FSCK_DELETED_KEY) + continue; + + k = bkey_next(k); + } + + return 0; +} + +static void journal_entry_btree_keys_to_text(struct printbuf *out, struct bch_fs *c, + struct jset_entry *entry) +{ + struct bkey_i *k; + bool first = true; + + jset_entry_for_each_key(entry, k) { + if (!first) { + prt_newline(out); + prt_printf(out, "%s: ", bch2_jset_entry_types[entry->type]); + } + prt_printf(out, "btree=%s l=%u ", bch2_btree_id_str(entry->btree_id), entry->level); + bch2_bkey_val_to_text(out, c, bkey_i_to_s_c(k)); + first = false; + } +} + +static int journal_entry_btree_root_validate(struct bch_fs *c, + struct jset *jset, + struct jset_entry *entry, + unsigned version, int big_endian, + enum bkey_invalid_flags flags) +{ + struct bkey_i *k = entry->start; + int ret = 0; + + if (journal_entry_err_on(!entry->u64s || + le16_to_cpu(entry->u64s) != k->k.u64s, + c, version, jset, entry, + journal_entry_btree_root_bad_size, + "invalid btree root journal entry: wrong number of keys")) { + void *next = vstruct_next(entry); + /* + * we don't want to null out this jset_entry, + * just the contents, so that later we can tell + * we were _supposed_ to have a btree root + */ + entry->u64s = 0; + journal_entry_null_range(vstruct_next(entry), next); + return 0; + } + + ret = journal_validate_key(c, jset, entry, 1, entry->btree_id, k, + version, big_endian, flags); + if (ret == FSCK_DELETED_KEY) + ret = 0; +fsck_err: + return ret; +} + +static void journal_entry_btree_root_to_text(struct printbuf *out, struct bch_fs *c, + struct jset_entry *entry) +{ + journal_entry_btree_keys_to_text(out, c, entry); +} + +static int journal_entry_prio_ptrs_validate(struct bch_fs *c, + struct jset *jset, + struct jset_entry *entry, + unsigned version, int big_endian, + enum bkey_invalid_flags flags) +{ + /* obsolete, don't care: */ + return 0; +} + +static void journal_entry_prio_ptrs_to_text(struct printbuf *out, struct bch_fs *c, + struct jset_entry *entry) +{ +} + +static int journal_entry_blacklist_validate(struct bch_fs *c, + struct jset *jset, + struct jset_entry *entry, + unsigned version, int big_endian, + enum bkey_invalid_flags flags) +{ + int ret = 0; + + if (journal_entry_err_on(le16_to_cpu(entry->u64s) != 1, + c, version, jset, entry, + journal_entry_blacklist_bad_size, + "invalid journal seq blacklist entry: bad size")) { + journal_entry_null_range(entry, vstruct_next(entry)); + } +fsck_err: + return ret; +} + +static void journal_entry_blacklist_to_text(struct printbuf *out, struct bch_fs *c, + struct jset_entry *entry) +{ + struct jset_entry_blacklist *bl = + container_of(entry, struct jset_entry_blacklist, entry); + + prt_printf(out, "seq=%llu", le64_to_cpu(bl->seq)); +} + +static int journal_entry_blacklist_v2_validate(struct bch_fs *c, + struct jset *jset, + struct jset_entry *entry, + unsigned version, int big_endian, + enum bkey_invalid_flags flags) +{ + struct jset_entry_blacklist_v2 *bl_entry; + int ret = 0; + + if (journal_entry_err_on(le16_to_cpu(entry->u64s) != 2, + c, version, jset, entry, + journal_entry_blacklist_v2_bad_size, + "invalid journal seq blacklist entry: bad size")) { + journal_entry_null_range(entry, vstruct_next(entry)); + goto out; + } + + bl_entry = container_of(entry, struct jset_entry_blacklist_v2, entry); + + if (journal_entry_err_on(le64_to_cpu(bl_entry->start) > + le64_to_cpu(bl_entry->end), + c, version, jset, entry, + journal_entry_blacklist_v2_start_past_end, + "invalid journal seq blacklist entry: start > end")) { + journal_entry_null_range(entry, vstruct_next(entry)); + } +out: +fsck_err: + return ret; +} + +static void journal_entry_blacklist_v2_to_text(struct printbuf *out, struct bch_fs *c, + struct jset_entry *entry) +{ + struct jset_entry_blacklist_v2 *bl = + container_of(entry, struct jset_entry_blacklist_v2, entry); + + prt_printf(out, "start=%llu end=%llu", + le64_to_cpu(bl->start), + le64_to_cpu(bl->end)); +} + +static int journal_entry_usage_validate(struct bch_fs *c, + struct jset *jset, + struct jset_entry *entry, + unsigned version, int big_endian, + enum bkey_invalid_flags flags) +{ + struct jset_entry_usage *u = + container_of(entry, struct jset_entry_usage, entry); + unsigned bytes = jset_u64s(le16_to_cpu(entry->u64s)) * sizeof(u64); + int ret = 0; + + if (journal_entry_err_on(bytes < sizeof(*u), + c, version, jset, entry, + journal_entry_usage_bad_size, + "invalid journal entry usage: bad size")) { + journal_entry_null_range(entry, vstruct_next(entry)); + return ret; + } + +fsck_err: + return ret; +} + +static void journal_entry_usage_to_text(struct printbuf *out, struct bch_fs *c, + struct jset_entry *entry) +{ + struct jset_entry_usage *u = + container_of(entry, struct jset_entry_usage, entry); + + prt_printf(out, "type=%s v=%llu", + bch2_fs_usage_types[u->entry.btree_id], + le64_to_cpu(u->v)); +} + +static int journal_entry_data_usage_validate(struct bch_fs *c, + struct jset *jset, + struct jset_entry *entry, + unsigned version, int big_endian, + enum bkey_invalid_flags flags) +{ + struct jset_entry_data_usage *u = + container_of(entry, struct jset_entry_data_usage, entry); + unsigned bytes = jset_u64s(le16_to_cpu(entry->u64s)) * sizeof(u64); + struct printbuf err = PRINTBUF; + int ret = 0; + + if (journal_entry_err_on(bytes < sizeof(*u) || + bytes < sizeof(*u) + u->r.nr_devs, + c, version, jset, entry, + journal_entry_data_usage_bad_size, + "invalid journal entry usage: bad size")) { + journal_entry_null_range(entry, vstruct_next(entry)); + goto out; + } + + if (journal_entry_err_on(bch2_replicas_entry_validate(&u->r, c->disk_sb.sb, &err), + c, version, jset, entry, + journal_entry_data_usage_bad_size, + "invalid journal entry usage: %s", err.buf)) { + journal_entry_null_range(entry, vstruct_next(entry)); + goto out; + } +out: +fsck_err: + printbuf_exit(&err); + return ret; +} + +static void journal_entry_data_usage_to_text(struct printbuf *out, struct bch_fs *c, + struct jset_entry *entry) +{ + struct jset_entry_data_usage *u = + container_of(entry, struct jset_entry_data_usage, entry); + + bch2_replicas_entry_to_text(out, &u->r); + prt_printf(out, "=%llu", le64_to_cpu(u->v)); +} + +static int journal_entry_clock_validate(struct bch_fs *c, + struct jset *jset, + struct jset_entry *entry, + unsigned version, int big_endian, + enum bkey_invalid_flags flags) +{ + struct jset_entry_clock *clock = + container_of(entry, struct jset_entry_clock, entry); + unsigned bytes = jset_u64s(le16_to_cpu(entry->u64s)) * sizeof(u64); + int ret = 0; + + if (journal_entry_err_on(bytes != sizeof(*clock), + c, version, jset, entry, + journal_entry_clock_bad_size, + "bad size")) { + journal_entry_null_range(entry, vstruct_next(entry)); + return ret; + } + + if (journal_entry_err_on(clock->rw > 1, + c, version, jset, entry, + journal_entry_clock_bad_rw, + "bad rw")) { + journal_entry_null_range(entry, vstruct_next(entry)); + return ret; + } + +fsck_err: + return ret; +} + +static void journal_entry_clock_to_text(struct printbuf *out, struct bch_fs *c, + struct jset_entry *entry) +{ + struct jset_entry_clock *clock = + container_of(entry, struct jset_entry_clock, entry); + + prt_printf(out, "%s=%llu", clock->rw ? "write" : "read", le64_to_cpu(clock->time)); +} + +static int journal_entry_dev_usage_validate(struct bch_fs *c, + struct jset *jset, + struct jset_entry *entry, + unsigned version, int big_endian, + enum bkey_invalid_flags flags) +{ + struct jset_entry_dev_usage *u = + container_of(entry, struct jset_entry_dev_usage, entry); + unsigned bytes = jset_u64s(le16_to_cpu(entry->u64s)) * sizeof(u64); + unsigned expected = sizeof(*u); + unsigned dev; + int ret = 0; + + if (journal_entry_err_on(bytes < expected, + c, version, jset, entry, + journal_entry_dev_usage_bad_size, + "bad size (%u < %u)", + bytes, expected)) { + journal_entry_null_range(entry, vstruct_next(entry)); + return ret; + } + + dev = le32_to_cpu(u->dev); + + if (journal_entry_err_on(!bch2_dev_exists2(c, dev), + c, version, jset, entry, + journal_entry_dev_usage_bad_dev, + "bad dev")) { + journal_entry_null_range(entry, vstruct_next(entry)); + return ret; + } + + if (journal_entry_err_on(u->pad, + c, version, jset, entry, + journal_entry_dev_usage_bad_pad, + "bad pad")) { + journal_entry_null_range(entry, vstruct_next(entry)); + return ret; + } + +fsck_err: + return ret; +} + +static void journal_entry_dev_usage_to_text(struct printbuf *out, struct bch_fs *c, + struct jset_entry *entry) +{ + struct jset_entry_dev_usage *u = + container_of(entry, struct jset_entry_dev_usage, entry); + unsigned i, nr_types = jset_entry_dev_usage_nr_types(u); + + prt_printf(out, "dev=%u", le32_to_cpu(u->dev)); + + for (i = 0; i < nr_types; i++) { + if (i < BCH_DATA_NR) + prt_printf(out, " %s", bch2_data_types[i]); + else + prt_printf(out, " (unknown data type %u)", i); + prt_printf(out, ": buckets=%llu sectors=%llu fragmented=%llu", + le64_to_cpu(u->d[i].buckets), + le64_to_cpu(u->d[i].sectors), + le64_to_cpu(u->d[i].fragmented)); + } +} + +static int journal_entry_log_validate(struct bch_fs *c, + struct jset *jset, + struct jset_entry *entry, + unsigned version, int big_endian, + enum bkey_invalid_flags flags) +{ + return 0; +} + +static void journal_entry_log_to_text(struct printbuf *out, struct bch_fs *c, + struct jset_entry *entry) +{ + struct jset_entry_log *l = container_of(entry, struct jset_entry_log, entry); + unsigned bytes = vstruct_bytes(entry) - offsetof(struct jset_entry_log, d); + + prt_printf(out, "%.*s", bytes, l->d); +} + +static int journal_entry_overwrite_validate(struct bch_fs *c, + struct jset *jset, + struct jset_entry *entry, + unsigned version, int big_endian, + enum bkey_invalid_flags flags) +{ + return journal_entry_btree_keys_validate(c, jset, entry, + version, big_endian, READ); +} + +static void journal_entry_overwrite_to_text(struct printbuf *out, struct bch_fs *c, + struct jset_entry *entry) +{ + journal_entry_btree_keys_to_text(out, c, entry); +} + +static int journal_entry_write_buffer_keys_validate(struct bch_fs *c, + struct jset *jset, + struct jset_entry *entry, + unsigned version, int big_endian, + enum bkey_invalid_flags flags) +{ + return journal_entry_btree_keys_validate(c, jset, entry, + version, big_endian, READ); +} + +static void journal_entry_write_buffer_keys_to_text(struct printbuf *out, struct bch_fs *c, + struct jset_entry *entry) +{ + journal_entry_btree_keys_to_text(out, c, entry); +} + +struct jset_entry_ops { + int (*validate)(struct bch_fs *, struct jset *, + struct jset_entry *, unsigned, int, + enum bkey_invalid_flags); + void (*to_text)(struct printbuf *, struct bch_fs *, struct jset_entry *); +}; + +static const struct jset_entry_ops bch2_jset_entry_ops[] = { +#define x(f, nr) \ + [BCH_JSET_ENTRY_##f] = (struct jset_entry_ops) { \ + .validate = journal_entry_##f##_validate, \ + .to_text = journal_entry_##f##_to_text, \ + }, + BCH_JSET_ENTRY_TYPES() +#undef x +}; + +int bch2_journal_entry_validate(struct bch_fs *c, + struct jset *jset, + struct jset_entry *entry, + unsigned version, int big_endian, + enum bkey_invalid_flags flags) +{ + return entry->type < BCH_JSET_ENTRY_NR + ? bch2_jset_entry_ops[entry->type].validate(c, jset, entry, + version, big_endian, flags) + : 0; +} + +void bch2_journal_entry_to_text(struct printbuf *out, struct bch_fs *c, + struct jset_entry *entry) +{ + if (entry->type < BCH_JSET_ENTRY_NR) { + prt_printf(out, "%s: ", bch2_jset_entry_types[entry->type]); + bch2_jset_entry_ops[entry->type].to_text(out, c, entry); + } else { + prt_printf(out, "(unknown type %u)", entry->type); + } +} + +static int jset_validate_entries(struct bch_fs *c, struct jset *jset, + enum bkey_invalid_flags flags) +{ + unsigned version = le32_to_cpu(jset->version); + int ret = 0; + + vstruct_for_each(jset, entry) { + if (journal_entry_err_on(vstruct_next(entry) > vstruct_last(jset), + c, version, jset, entry, + journal_entry_past_jset_end, + "journal entry extends past end of jset")) { + jset->u64s = cpu_to_le32((u64 *) entry - jset->_data); + break; + } + + ret = bch2_journal_entry_validate(c, jset, entry, + version, JSET_BIG_ENDIAN(jset), flags); + if (ret) + break; + } +fsck_err: + return ret; +} + +static int jset_validate(struct bch_fs *c, + struct bch_dev *ca, + struct jset *jset, u64 sector, + enum bkey_invalid_flags flags) +{ + unsigned version; + int ret = 0; + + if (le64_to_cpu(jset->magic) != jset_magic(c)) + return JOURNAL_ENTRY_NONE; + + version = le32_to_cpu(jset->version); + if (journal_entry_err_on(!bch2_version_compatible(version), + c, version, jset, NULL, + jset_unsupported_version, + "%s sector %llu seq %llu: incompatible journal entry version %u.%u", + ca ? ca->name : c->name, + sector, le64_to_cpu(jset->seq), + BCH_VERSION_MAJOR(version), + BCH_VERSION_MINOR(version))) { + /* don't try to continue: */ + return -EINVAL; + } + + if (journal_entry_err_on(!bch2_checksum_type_valid(c, JSET_CSUM_TYPE(jset)), + c, version, jset, NULL, + jset_unknown_csum, + "%s sector %llu seq %llu: journal entry with unknown csum type %llu", + ca ? ca->name : c->name, + sector, le64_to_cpu(jset->seq), + JSET_CSUM_TYPE(jset))) + ret = JOURNAL_ENTRY_BAD; + + /* last_seq is ignored when JSET_NO_FLUSH is true */ + if (journal_entry_err_on(!JSET_NO_FLUSH(jset) && + le64_to_cpu(jset->last_seq) > le64_to_cpu(jset->seq), + c, version, jset, NULL, + jset_last_seq_newer_than_seq, + "invalid journal entry: last_seq > seq (%llu > %llu)", + le64_to_cpu(jset->last_seq), + le64_to_cpu(jset->seq))) { + jset->last_seq = jset->seq; + return JOURNAL_ENTRY_BAD; + } + + ret = jset_validate_entries(c, jset, flags); +fsck_err: + return ret; +} + +static int jset_validate_early(struct bch_fs *c, + struct bch_dev *ca, + struct jset *jset, u64 sector, + unsigned bucket_sectors_left, + unsigned sectors_read) +{ + size_t bytes = vstruct_bytes(jset); + unsigned version; + enum bkey_invalid_flags flags = BKEY_INVALID_JOURNAL; + int ret = 0; + + if (le64_to_cpu(jset->magic) != jset_magic(c)) + return JOURNAL_ENTRY_NONE; + + version = le32_to_cpu(jset->version); + if (journal_entry_err_on(!bch2_version_compatible(version), + c, version, jset, NULL, + jset_unsupported_version, + "%s sector %llu seq %llu: unknown journal entry version %u.%u", + ca ? ca->name : c->name, + sector, le64_to_cpu(jset->seq), + BCH_VERSION_MAJOR(version), + BCH_VERSION_MINOR(version))) { + /* don't try to continue: */ + return -EINVAL; + } + + if (bytes > (sectors_read << 9) && + sectors_read < bucket_sectors_left) + return JOURNAL_ENTRY_REREAD; + + if (journal_entry_err_on(bytes > bucket_sectors_left << 9, + c, version, jset, NULL, + jset_past_bucket_end, + "%s sector %llu seq %llu: journal entry too big (%zu bytes)", + ca ? ca->name : c->name, + sector, le64_to_cpu(jset->seq), bytes)) + le32_add_cpu(&jset->u64s, + -((bytes - (bucket_sectors_left << 9)) / 8)); +fsck_err: + return ret; +} + +struct journal_read_buf { + void *data; + size_t size; +}; + +static int journal_read_buf_realloc(struct journal_read_buf *b, + size_t new_size) +{ + void *n; + + /* the bios are sized for this many pages, max: */ + if (new_size > JOURNAL_ENTRY_SIZE_MAX) + return -BCH_ERR_ENOMEM_journal_read_buf_realloc; + + new_size = roundup_pow_of_two(new_size); + n = kvpmalloc(new_size, GFP_KERNEL); + if (!n) + return -BCH_ERR_ENOMEM_journal_read_buf_realloc; + + kvpfree(b->data, b->size); + b->data = n; + b->size = new_size; + return 0; +} + +static int journal_read_bucket(struct bch_dev *ca, + struct journal_read_buf *buf, + struct journal_list *jlist, + unsigned bucket) +{ + struct bch_fs *c = ca->fs; + struct journal_device *ja = &ca->journal; + struct jset *j = NULL; + unsigned sectors, sectors_read = 0; + u64 offset = bucket_to_sector(ca, ja->buckets[bucket]), + end = offset + ca->mi.bucket_size; + bool saw_bad = false, csum_good; + struct printbuf err = PRINTBUF; + int ret = 0; + + pr_debug("reading %u", bucket); + + while (offset < end) { + if (!sectors_read) { + struct bio *bio; + unsigned nr_bvecs; +reread: + sectors_read = min_t(unsigned, + end - offset, buf->size >> 9); + nr_bvecs = buf_pages(buf->data, sectors_read << 9); + + bio = bio_kmalloc(nr_bvecs, GFP_KERNEL); + bio_init(bio, ca->disk_sb.bdev, bio->bi_inline_vecs, nr_bvecs, REQ_OP_READ); + + bio->bi_iter.bi_sector = offset; + bch2_bio_map(bio, buf->data, sectors_read << 9); + + ret = submit_bio_wait(bio); + kfree(bio); + + if (bch2_dev_io_err_on(ret, ca, BCH_MEMBER_ERROR_read, + "journal read error: sector %llu", + offset) || + bch2_meta_read_fault("journal")) { + /* + * We don't error out of the recovery process + * here, since the relevant journal entry may be + * found on a different device, and missing or + * no journal entries will be handled later + */ + goto out; + } + + j = buf->data; + } + + ret = jset_validate_early(c, ca, j, offset, + end - offset, sectors_read); + switch (ret) { + case 0: + sectors = vstruct_sectors(j, c->block_bits); + break; + case JOURNAL_ENTRY_REREAD: + if (vstruct_bytes(j) > buf->size) { + ret = journal_read_buf_realloc(buf, + vstruct_bytes(j)); + if (ret) + goto err; + } + goto reread; + case JOURNAL_ENTRY_NONE: + if (!saw_bad) + goto out; + /* + * On checksum error we don't really trust the size + * field of the journal entry we read, so try reading + * again at next block boundary: + */ + sectors = block_sectors(c); + goto next_block; + default: + goto err; + } + + /* + * This happens sometimes if we don't have discards on - + * when we've partially overwritten a bucket with new + * journal entries. We don't need the rest of the + * bucket: + */ + if (le64_to_cpu(j->seq) < ja->bucket_seq[bucket]) + goto out; + + ja->bucket_seq[bucket] = le64_to_cpu(j->seq); + + enum bch_csum_type csum_type = JSET_CSUM_TYPE(j); + struct bch_csum csum; + csum_good = jset_csum_good(c, j, &csum); + + if (bch2_dev_io_err_on(!csum_good, ca, BCH_MEMBER_ERROR_checksum, + "%s", + (printbuf_reset(&err), + prt_str(&err, "journal "), + bch2_csum_err_msg(&err, csum_type, j->csum, csum), + err.buf))) + saw_bad = true; + + ret = bch2_encrypt(c, JSET_CSUM_TYPE(j), journal_nonce(j), + j->encrypted_start, + vstruct_end(j) - (void *) j->encrypted_start); + bch2_fs_fatal_err_on(ret, c, + "error decrypting journal entry: %s", + bch2_err_str(ret)); + + mutex_lock(&jlist->lock); + ret = journal_entry_add(c, ca, (struct journal_ptr) { + .csum_good = csum_good, + .dev = ca->dev_idx, + .bucket = bucket, + .bucket_offset = offset - + bucket_to_sector(ca, ja->buckets[bucket]), + .sector = offset, + }, jlist, j); + mutex_unlock(&jlist->lock); + + switch (ret) { + case JOURNAL_ENTRY_ADD_OK: + break; + case JOURNAL_ENTRY_ADD_OUT_OF_RANGE: + break; + default: + goto err; + } +next_block: + pr_debug("next"); + offset += sectors; + sectors_read -= sectors; + j = ((void *) j) + (sectors << 9); + } + +out: + ret = 0; +err: + printbuf_exit(&err); + return ret; +} + +static CLOSURE_CALLBACK(bch2_journal_read_device) +{ + closure_type(ja, struct journal_device, read); + struct bch_dev *ca = container_of(ja, struct bch_dev, journal); + struct bch_fs *c = ca->fs; + struct journal_list *jlist = + container_of(cl->parent, struct journal_list, cl); + struct journal_replay *r, **_r; + struct genradix_iter iter; + struct journal_read_buf buf = { NULL, 0 }; + unsigned i; + int ret = 0; + + if (!ja->nr) + goto out; + + ret = journal_read_buf_realloc(&buf, PAGE_SIZE); + if (ret) + goto err; + + pr_debug("%u journal buckets", ja->nr); + + for (i = 0; i < ja->nr; i++) { + ret = journal_read_bucket(ca, &buf, jlist, i); + if (ret) + goto err; + } + + ja->sectors_free = ca->mi.bucket_size; + + mutex_lock(&jlist->lock); + genradix_for_each_reverse(&c->journal_entries, iter, _r) { + r = *_r; + + if (!r) + continue; + + for (i = 0; i < r->nr_ptrs; i++) { + if (r->ptrs[i].dev == ca->dev_idx) { + unsigned wrote = bucket_remainder(ca, r->ptrs[i].sector) + + vstruct_sectors(&r->j, c->block_bits); + + ja->cur_idx = r->ptrs[i].bucket; + ja->sectors_free = ca->mi.bucket_size - wrote; + goto found; + } + } + } +found: + mutex_unlock(&jlist->lock); + + if (ja->bucket_seq[ja->cur_idx] && + ja->sectors_free == ca->mi.bucket_size) { +#if 0 + /* + * Debug code for ZNS support, where we (probably) want to be + * correlated where we stopped in the journal to the zone write + * points: + */ + bch_err(c, "ja->sectors_free == ca->mi.bucket_size"); + bch_err(c, "cur_idx %u/%u", ja->cur_idx, ja->nr); + for (i = 0; i < 3; i++) { + unsigned idx = (ja->cur_idx + ja->nr - 1 + i) % ja->nr; + + bch_err(c, "bucket_seq[%u] = %llu", idx, ja->bucket_seq[idx]); + } +#endif + ja->sectors_free = 0; + } + + /* + * Set dirty_idx to indicate the entire journal is full and needs to be + * reclaimed - journal reclaim will immediately reclaim whatever isn't + * pinned when it first runs: + */ + ja->discard_idx = ja->dirty_idx_ondisk = + ja->dirty_idx = (ja->cur_idx + 1) % ja->nr; +out: + bch_verbose(c, "journal read done on device %s, ret %i", ca->name, ret); + kvpfree(buf.data, buf.size); + percpu_ref_put(&ca->io_ref); + closure_return(cl); + return; +err: + mutex_lock(&jlist->lock); + jlist->ret = ret; + mutex_unlock(&jlist->lock); + goto out; +} + +void bch2_journal_ptrs_to_text(struct printbuf *out, struct bch_fs *c, + struct journal_replay *j) +{ + unsigned i; + + for (i = 0; i < j->nr_ptrs; i++) { + struct bch_dev *ca = bch_dev_bkey_exists(c, j->ptrs[i].dev); + u64 offset; + + div64_u64_rem(j->ptrs[i].sector, ca->mi.bucket_size, &offset); + + if (i) + prt_printf(out, " "); + prt_printf(out, "%u:%u:%u (sector %llu)", + j->ptrs[i].dev, + j->ptrs[i].bucket, + j->ptrs[i].bucket_offset, + j->ptrs[i].sector); + } +} + +int bch2_journal_read(struct bch_fs *c, + u64 *last_seq, + u64 *blacklist_seq, + u64 *start_seq) +{ + struct journal_list jlist; + struct journal_replay *i, **_i, *prev = NULL; + struct genradix_iter radix_iter; + struct printbuf buf = PRINTBUF; + bool degraded = false, last_write_torn = false; + u64 seq; + int ret = 0; + + closure_init_stack(&jlist.cl); + mutex_init(&jlist.lock); + jlist.last_seq = 0; + jlist.ret = 0; + + for_each_member_device(c, ca) { + if (!c->opts.fsck && + !(bch2_dev_has_data(c, ca) & (1 << BCH_DATA_journal))) + continue; + + if ((ca->mi.state == BCH_MEMBER_STATE_rw || + ca->mi.state == BCH_MEMBER_STATE_ro) && + percpu_ref_tryget(&ca->io_ref)) + closure_call(&ca->journal.read, + bch2_journal_read_device, + system_unbound_wq, + &jlist.cl); + else + degraded = true; + } + + closure_sync(&jlist.cl); + + if (jlist.ret) + return jlist.ret; + + *last_seq = 0; + *start_seq = 0; + *blacklist_seq = 0; + + /* + * Find most recent flush entry, and ignore newer non flush entries - + * those entries will be blacklisted: + */ + genradix_for_each_reverse(&c->journal_entries, radix_iter, _i) { + enum bkey_invalid_flags flags = BKEY_INVALID_JOURNAL; + + i = *_i; + + if (!i || i->ignore) + continue; + + if (!*start_seq) + *blacklist_seq = *start_seq = le64_to_cpu(i->j.seq) + 1; + + if (JSET_NO_FLUSH(&i->j)) { + i->ignore = true; + continue; + } + + if (!last_write_torn && !i->csum_good) { + last_write_torn = true; + i->ignore = true; + continue; + } + + if (journal_entry_err_on(le64_to_cpu(i->j.last_seq) > le64_to_cpu(i->j.seq), + c, le32_to_cpu(i->j.version), &i->j, NULL, + jset_last_seq_newer_than_seq, + "invalid journal entry: last_seq > seq (%llu > %llu)", + le64_to_cpu(i->j.last_seq), + le64_to_cpu(i->j.seq))) + i->j.last_seq = i->j.seq; + + *last_seq = le64_to_cpu(i->j.last_seq); + *blacklist_seq = le64_to_cpu(i->j.seq) + 1; + break; + } + + if (!*start_seq) { + bch_info(c, "journal read done, but no entries found"); + return 0; + } + + if (!*last_seq) { + fsck_err(c, dirty_but_no_journal_entries_post_drop_nonflushes, + "journal read done, but no entries found after dropping non-flushes"); + return 0; + } + + bch_info(c, "journal read done, replaying entries %llu-%llu", + *last_seq, *blacklist_seq - 1); + + if (*start_seq != *blacklist_seq) + bch_info(c, "dropped unflushed entries %llu-%llu", + *blacklist_seq, *start_seq - 1); + + /* Drop blacklisted entries and entries older than last_seq: */ + genradix_for_each(&c->journal_entries, radix_iter, _i) { + i = *_i; + + if (!i || i->ignore) + continue; + + seq = le64_to_cpu(i->j.seq); + if (seq < *last_seq) { + journal_replay_free(c, i); + continue; + } + + if (bch2_journal_seq_is_blacklisted(c, seq, true)) { + fsck_err_on(!JSET_NO_FLUSH(&i->j), c, + jset_seq_blacklisted, + "found blacklisted journal entry %llu", seq); + i->ignore = true; + } + } + + /* Check for missing entries: */ + seq = *last_seq; + genradix_for_each(&c->journal_entries, radix_iter, _i) { + i = *_i; + + if (!i || i->ignore) + continue; + + BUG_ON(seq > le64_to_cpu(i->j.seq)); + + while (seq < le64_to_cpu(i->j.seq)) { + u64 missing_start, missing_end; + struct printbuf buf1 = PRINTBUF, buf2 = PRINTBUF; + + while (seq < le64_to_cpu(i->j.seq) && + bch2_journal_seq_is_blacklisted(c, seq, false)) + seq++; + + if (seq == le64_to_cpu(i->j.seq)) + break; + + missing_start = seq; + + while (seq < le64_to_cpu(i->j.seq) && + !bch2_journal_seq_is_blacklisted(c, seq, false)) + seq++; + + if (prev) { + bch2_journal_ptrs_to_text(&buf1, c, prev); + prt_printf(&buf1, " size %zu", vstruct_sectors(&prev->j, c->block_bits)); + } else + prt_printf(&buf1, "(none)"); + bch2_journal_ptrs_to_text(&buf2, c, i); + + missing_end = seq - 1; + fsck_err(c, journal_entries_missing, + "journal entries %llu-%llu missing! (replaying %llu-%llu)\n" + " prev at %s\n" + " next at %s", + missing_start, missing_end, + *last_seq, *blacklist_seq - 1, + buf1.buf, buf2.buf); + + printbuf_exit(&buf1); + printbuf_exit(&buf2); + } + + prev = i; + seq++; + } + + genradix_for_each(&c->journal_entries, radix_iter, _i) { + struct bch_replicas_padded replicas = { + .e.data_type = BCH_DATA_journal, + .e.nr_required = 1, + }; + unsigned ptr; + + i = *_i; + if (!i || i->ignore) + continue; + + for (ptr = 0; ptr < i->nr_ptrs; ptr++) { + struct bch_dev *ca = bch_dev_bkey_exists(c, i->ptrs[ptr].dev); + + if (!i->ptrs[ptr].csum_good) + bch_err_dev_offset(ca, i->ptrs[ptr].sector, + "invalid journal checksum, seq %llu%s", + le64_to_cpu(i->j.seq), + i->csum_good ? " (had good copy on another device)" : ""); + } + + ret = jset_validate(c, + bch_dev_bkey_exists(c, i->ptrs[0].dev), + &i->j, + i->ptrs[0].sector, + READ); + if (ret) + goto err; + + for (ptr = 0; ptr < i->nr_ptrs; ptr++) + replicas.e.devs[replicas.e.nr_devs++] = i->ptrs[ptr].dev; + + bch2_replicas_entry_sort(&replicas.e); + + printbuf_reset(&buf); + bch2_replicas_entry_to_text(&buf, &replicas.e); + + if (!degraded && + !bch2_replicas_marked(c, &replicas.e) && + (le64_to_cpu(i->j.seq) == *last_seq || + fsck_err(c, journal_entry_replicas_not_marked, + "superblock not marked as containing replicas for journal entry %llu\n %s", + le64_to_cpu(i->j.seq), buf.buf))) { + ret = bch2_mark_replicas(c, &replicas.e); + if (ret) + goto err; + } + } +err: +fsck_err: + printbuf_exit(&buf); + return ret; +} + +/* journal write: */ + +static void __journal_write_alloc(struct journal *j, + struct journal_buf *w, + struct dev_alloc_list *devs_sorted, + unsigned sectors, + unsigned *replicas, + unsigned replicas_want) +{ + struct bch_fs *c = container_of(j, struct bch_fs, journal); + struct journal_device *ja; + struct bch_dev *ca; + unsigned i; + + if (*replicas >= replicas_want) + return; + + for (i = 0; i < devs_sorted->nr; i++) { + ca = rcu_dereference(c->devs[devs_sorted->devs[i]]); + if (!ca) + continue; + + ja = &ca->journal; + + /* + * Check that we can use this device, and aren't already using + * it: + */ + if (!ca->mi.durability || + ca->mi.state != BCH_MEMBER_STATE_rw || + !ja->nr || + bch2_bkey_has_device_c(bkey_i_to_s_c(&w->key), ca->dev_idx) || + sectors > ja->sectors_free) + continue; + + bch2_dev_stripe_increment(ca, &j->wp.stripe); + + bch2_bkey_append_ptr(&w->key, + (struct bch_extent_ptr) { + .offset = bucket_to_sector(ca, + ja->buckets[ja->cur_idx]) + + ca->mi.bucket_size - + ja->sectors_free, + .dev = ca->dev_idx, + }); + + ja->sectors_free -= sectors; + ja->bucket_seq[ja->cur_idx] = le64_to_cpu(w->data->seq); + + *replicas += ca->mi.durability; + + if (*replicas >= replicas_want) + break; + } +} + +/** + * journal_write_alloc - decide where to write next journal entry + * + * @j: journal object + * @w: journal buf (entry to be written) + * + * Returns: 0 on success, or -EROFS on failure + */ +static int journal_write_alloc(struct journal *j, struct journal_buf *w) +{ + struct bch_fs *c = container_of(j, struct bch_fs, journal); + struct bch_devs_mask devs; + struct journal_device *ja; + struct bch_dev *ca; + struct dev_alloc_list devs_sorted; + unsigned sectors = vstruct_sectors(w->data, c->block_bits); + unsigned target = c->opts.metadata_target ?: + c->opts.foreground_target; + unsigned i, replicas = 0, replicas_want = + READ_ONCE(c->opts.metadata_replicas); + + rcu_read_lock(); +retry: + devs = target_rw_devs(c, BCH_DATA_journal, target); + + devs_sorted = bch2_dev_alloc_list(c, &j->wp.stripe, &devs); + + __journal_write_alloc(j, w, &devs_sorted, + sectors, &replicas, replicas_want); + + if (replicas >= replicas_want) + goto done; + + for (i = 0; i < devs_sorted.nr; i++) { + ca = rcu_dereference(c->devs[devs_sorted.devs[i]]); + if (!ca) + continue; + + ja = &ca->journal; + + if (sectors > ja->sectors_free && + sectors <= ca->mi.bucket_size && + bch2_journal_dev_buckets_available(j, ja, + journal_space_discarded)) { + ja->cur_idx = (ja->cur_idx + 1) % ja->nr; + ja->sectors_free = ca->mi.bucket_size; + + /* + * ja->bucket_seq[ja->cur_idx] must always have + * something sensible: + */ + ja->bucket_seq[ja->cur_idx] = le64_to_cpu(w->data->seq); + } + } + + __journal_write_alloc(j, w, &devs_sorted, + sectors, &replicas, replicas_want); + + if (replicas < replicas_want && target) { + /* Retry from all devices: */ + target = 0; + goto retry; + } +done: + rcu_read_unlock(); + + BUG_ON(bkey_val_u64s(&w->key.k) > BCH_REPLICAS_MAX); + + return replicas >= c->opts.metadata_replicas_required ? 0 : -EROFS; +} + +static void journal_buf_realloc(struct journal *j, struct journal_buf *buf) +{ + struct bch_fs *c = container_of(j, struct bch_fs, journal); + + /* we aren't holding j->lock: */ + unsigned new_size = READ_ONCE(j->buf_size_want); + void *new_buf; + + if (buf->buf_size >= new_size) + return; + + size_t btree_write_buffer_size = new_size / 64; + + if (bch2_btree_write_buffer_resize(c, btree_write_buffer_size)) + return; + + new_buf = kvpmalloc(new_size, GFP_NOFS|__GFP_NOWARN); + if (!new_buf) + return; + + memcpy(new_buf, buf->data, buf->buf_size); + + spin_lock(&j->lock); + swap(buf->data, new_buf); + swap(buf->buf_size, new_size); + spin_unlock(&j->lock); + + kvpfree(new_buf, new_size); +} + +static inline struct journal_buf *journal_last_unwritten_buf(struct journal *j) +{ + return j->buf + (journal_last_unwritten_seq(j) & JOURNAL_BUF_MASK); +} + +static CLOSURE_CALLBACK(journal_write_done) +{ + closure_type(j, struct journal, io); + struct bch_fs *c = container_of(j, struct bch_fs, journal); + struct journal_buf *w = journal_last_unwritten_buf(j); + struct bch_replicas_padded replicas; + union journal_res_state old, new; + u64 v, seq; + int err = 0; + + bch2_time_stats_update(!JSET_NO_FLUSH(w->data) + ? j->flush_write_time + : j->noflush_write_time, j->write_start_time); + + if (!w->devs_written.nr) { + bch_err(c, "unable to write journal to sufficient devices"); + err = -EIO; + } else { + bch2_devlist_to_replicas(&replicas.e, BCH_DATA_journal, + w->devs_written); + if (bch2_mark_replicas(c, &replicas.e)) + err = -EIO; + } + + if (err) + bch2_fatal_error(c); + + spin_lock(&j->lock); + seq = le64_to_cpu(w->data->seq); + + if (seq >= j->pin.front) + journal_seq_pin(j, seq)->devs = w->devs_written; + + if (!err) { + if (!JSET_NO_FLUSH(w->data)) { + j->flushed_seq_ondisk = seq; + j->last_seq_ondisk = w->last_seq; + + bch2_do_discards(c); + closure_wake_up(&c->freelist_wait); + + bch2_reset_alloc_cursors(c); + } + } else if (!j->err_seq || seq < j->err_seq) + j->err_seq = seq; + + j->seq_ondisk = seq; + + /* + * Updating last_seq_ondisk may let bch2_journal_reclaim_work() discard + * more buckets: + * + * Must come before signaling write completion, for + * bch2_fs_journal_stop(): + */ + if (j->watermark != BCH_WATERMARK_stripe) + journal_reclaim_kick(&c->journal); + + /* also must come before signalling write completion: */ + closure_debug_destroy(cl); + + v = atomic64_read(&j->reservations.counter); + do { + old.v = new.v = v; + BUG_ON(journal_state_count(new, new.unwritten_idx)); + + new.unwritten_idx++; + } while ((v = atomic64_cmpxchg(&j->reservations.counter, + old.v, new.v)) != old.v); + + bch2_journal_reclaim_fast(j); + bch2_journal_space_available(j); + + track_event_change(&c->times[BCH_TIME_blocked_journal_max_in_flight], + &j->max_in_flight_start, false); + + closure_wake_up(&w->wait); + journal_wake(j); + + if (!journal_state_count(new, new.unwritten_idx) && + journal_last_unwritten_seq(j) <= journal_cur_seq(j)) { + spin_unlock(&j->lock); + closure_call(&j->io, bch2_journal_write, c->io_complete_wq, NULL); + } else if (journal_last_unwritten_seq(j) == journal_cur_seq(j) && + new.cur_entry_offset < JOURNAL_ENTRY_CLOSED_VAL) { + struct journal_buf *buf = journal_cur_buf(j); + long delta = buf->expires - jiffies; + + /* + * We don't close a journal entry to write it while there's + * previous entries still in flight - the current journal entry + * might want to be written now: + */ + + spin_unlock(&j->lock); + mod_delayed_work(c->io_complete_wq, &j->write_work, max(0L, delta)); + } else { + spin_unlock(&j->lock); + } +} + +static void journal_write_endio(struct bio *bio) +{ + struct bch_dev *ca = bio->bi_private; + struct journal *j = &ca->fs->journal; + struct journal_buf *w = journal_last_unwritten_buf(j); + unsigned long flags; + + if (bch2_dev_io_err_on(bio->bi_status, ca, BCH_MEMBER_ERROR_write, + "error writing journal entry %llu: %s", + le64_to_cpu(w->data->seq), + bch2_blk_status_to_str(bio->bi_status)) || + bch2_meta_write_fault("journal")) { + spin_lock_irqsave(&j->err_lock, flags); + bch2_dev_list_drop_dev(&w->devs_written, ca->dev_idx); + spin_unlock_irqrestore(&j->err_lock, flags); + } + + closure_put(&j->io); + percpu_ref_put(&ca->io_ref); +} + +static CLOSURE_CALLBACK(do_journal_write) +{ + closure_type(j, struct journal, io); + struct bch_fs *c = container_of(j, struct bch_fs, journal); + struct bch_dev *ca; + struct journal_buf *w = journal_last_unwritten_buf(j); + struct bio *bio; + unsigned sectors = vstruct_sectors(w->data, c->block_bits); + + extent_for_each_ptr(bkey_i_to_s_extent(&w->key), ptr) { + ca = bch_dev_bkey_exists(c, ptr->dev); + if (!percpu_ref_tryget(&ca->io_ref)) { + /* XXX: fix this */ + bch_err(c, "missing device for journal write\n"); + continue; + } + + this_cpu_add(ca->io_done->sectors[WRITE][BCH_DATA_journal], + sectors); + + bio = ca->journal.bio; + bio_reset(bio, ca->disk_sb.bdev, REQ_OP_WRITE|REQ_SYNC|REQ_META); + bio->bi_iter.bi_sector = ptr->offset; + bio->bi_end_io = journal_write_endio; + bio->bi_private = ca; + + BUG_ON(bio->bi_iter.bi_sector == ca->prev_journal_sector); + ca->prev_journal_sector = bio->bi_iter.bi_sector; + + if (!JSET_NO_FLUSH(w->data)) + bio->bi_opf |= REQ_FUA; + if (!JSET_NO_FLUSH(w->data) && !w->separate_flush) + bio->bi_opf |= REQ_PREFLUSH; + + bch2_bio_map(bio, w->data, sectors << 9); + + trace_and_count(c, journal_write, bio); + closure_bio_submit(bio, cl); + + ca->journal.bucket_seq[ca->journal.cur_idx] = + le64_to_cpu(w->data->seq); + } + + continue_at(cl, journal_write_done, c->io_complete_wq); +} + +static int bch2_journal_write_prep(struct journal *j, struct journal_buf *w) +{ + struct bch_fs *c = container_of(j, struct bch_fs, journal); + struct jset_entry *start, *end; + struct jset *jset = w->data; + struct journal_keys_to_wb wb = { NULL }; + unsigned sectors, bytes, u64s; + unsigned long btree_roots_have = 0; + bool validate_before_checksum = false; + u64 seq = le64_to_cpu(jset->seq); + int ret; + + /* + * Simple compaction, dropping empty jset_entries (from journal + * reservations that weren't fully used) and merging jset_entries that + * can be. + * + * If we wanted to be really fancy here, we could sort all the keys in + * the jset and drop keys that were overwritten - probably not worth it: + */ + vstruct_for_each(jset, i) { + unsigned u64s = le16_to_cpu(i->u64s); + + /* Empty entry: */ + if (!u64s) + continue; + + /* + * New btree roots are set by journalling them; when the journal + * entry gets written we have to propagate them to + * c->btree_roots + * + * But, every journal entry we write has to contain all the + * btree roots (at least for now); so after we copy btree roots + * to c->btree_roots we have to get any missing btree roots and + * add them to this journal entry: + */ + switch (i->type) { + case BCH_JSET_ENTRY_btree_root: + bch2_journal_entry_to_btree_root(c, i); + __set_bit(i->btree_id, &btree_roots_have); + break; + case BCH_JSET_ENTRY_write_buffer_keys: + EBUG_ON(!w->need_flush_to_write_buffer); + + if (!wb.wb) + bch2_journal_keys_to_write_buffer_start(c, &wb, seq); + + struct bkey_i *k; + jset_entry_for_each_key(i, k) { + ret = bch2_journal_key_to_wb(c, &wb, i->btree_id, k); + if (ret) { + bch2_fs_fatal_error(c, "-ENOMEM flushing journal keys to btree write buffer"); + bch2_journal_keys_to_write_buffer_end(c, &wb); + return ret; + } + } + i->type = BCH_JSET_ENTRY_btree_keys; + break; + } + } + + if (wb.wb) + bch2_journal_keys_to_write_buffer_end(c, &wb); + w->need_flush_to_write_buffer = false; + + start = end = vstruct_last(jset); + + end = bch2_btree_roots_to_journal_entries(c, end, btree_roots_have); + + bch2_journal_super_entries_add_common(c, &end, seq); + u64s = (u64 *) end - (u64 *) start; + BUG_ON(u64s > j->entry_u64s_reserved); + + le32_add_cpu(&jset->u64s, u64s); + + sectors = vstruct_sectors(jset, c->block_bits); + bytes = vstruct_bytes(jset); + + if (sectors > w->sectors) { + bch2_fs_fatal_error(c, "aieeee! journal write overran available space, %zu > %u (extra %u reserved %u/%u)", + vstruct_bytes(jset), w->sectors << 9, + u64s, w->u64s_reserved, j->entry_u64s_reserved); + return -EINVAL; + } + + jset->magic = cpu_to_le64(jset_magic(c)); + jset->version = cpu_to_le32(c->sb.version); + + SET_JSET_BIG_ENDIAN(jset, CPU_BIG_ENDIAN); + SET_JSET_CSUM_TYPE(jset, bch2_meta_checksum_type(c)); + + if (!JSET_NO_FLUSH(jset) && journal_entry_empty(jset)) + j->last_empty_seq = seq; + + if (bch2_csum_type_is_encryption(JSET_CSUM_TYPE(jset))) + validate_before_checksum = true; + + if (le32_to_cpu(jset->version) < bcachefs_metadata_version_current) + validate_before_checksum = true; + + if (validate_before_checksum && + (ret = jset_validate(c, NULL, jset, 0, WRITE))) + return ret; + + ret = bch2_encrypt(c, JSET_CSUM_TYPE(jset), journal_nonce(jset), + jset->encrypted_start, + vstruct_end(jset) - (void *) jset->encrypted_start); + if (bch2_fs_fatal_err_on(ret, c, + "error decrypting journal entry: %i", ret)) + return ret; + + jset->csum = csum_vstruct(c, JSET_CSUM_TYPE(jset), + journal_nonce(jset), jset); + + if (!validate_before_checksum && + (ret = jset_validate(c, NULL, jset, 0, WRITE))) + return ret; + + memset((void *) jset + bytes, 0, (sectors << 9) - bytes); + return 0; +} + +static int bch2_journal_write_pick_flush(struct journal *j, struct journal_buf *w) +{ + struct bch_fs *c = container_of(j, struct bch_fs, journal); + int error = bch2_journal_error(j); + + /* + * If the journal is in an error state - we did an emergency shutdown - + * we prefer to continue doing journal writes. We just mark them as + * noflush so they'll never be used, but they'll still be visible by the + * list_journal tool - this helps in debugging. + * + * There's a caveat: the first journal write after marking the + * superblock dirty must always be a flush write, because on startup + * from a clean shutdown we didn't necessarily read the journal and the + * new journal write might overwrite whatever was in the journal + * previously - we can't leave the journal without any flush writes in + * it. + * + * So if we're in an error state, and we're still starting up, we don't + * write anything at all. + */ + if (error && test_bit(JOURNAL_NEED_FLUSH_WRITE, &j->flags)) + return -EIO; + + if (error || + w->noflush || + (!w->must_flush && + (jiffies - j->last_flush_write) < msecs_to_jiffies(c->opts.journal_flush_delay) && + test_bit(JOURNAL_MAY_SKIP_FLUSH, &j->flags))) { + w->noflush = true; + SET_JSET_NO_FLUSH(w->data, true); + w->data->last_seq = 0; + w->last_seq = 0; + + j->nr_noflush_writes++; + } else { + j->last_flush_write = jiffies; + j->nr_flush_writes++; + clear_bit(JOURNAL_NEED_FLUSH_WRITE, &j->flags); + } + + return 0; +} + +CLOSURE_CALLBACK(bch2_journal_write) +{ + closure_type(j, struct journal, io); + struct bch_fs *c = container_of(j, struct bch_fs, journal); + struct journal_buf *w = journal_last_unwritten_buf(j); + struct bch_replicas_padded replicas; + struct bio *bio; + struct printbuf journal_debug_buf = PRINTBUF; + unsigned nr_rw_members = 0; + int ret; + + BUG_ON(BCH_SB_CLEAN(c->disk_sb.sb)); + + j->write_start_time = local_clock(); + + spin_lock(&j->lock); + ret = bch2_journal_write_pick_flush(j, w); + spin_unlock(&j->lock); + if (ret) + goto err; + + mutex_lock(&j->buf_lock); + journal_buf_realloc(j, w); + + ret = bch2_journal_write_prep(j, w); + mutex_unlock(&j->buf_lock); + if (ret) + goto err; + + j->entry_bytes_written += vstruct_bytes(w->data); + + while (1) { + spin_lock(&j->lock); + ret = journal_write_alloc(j, w); + if (!ret || !j->can_discard) + break; + + spin_unlock(&j->lock); + bch2_journal_do_discards(j); + } + + if (ret) { + __bch2_journal_debug_to_text(&journal_debug_buf, j); + spin_unlock(&j->lock); + bch_err(c, "Unable to allocate journal write:\n%s", + journal_debug_buf.buf); + printbuf_exit(&journal_debug_buf); + goto err; + } + + /* + * write is allocated, no longer need to account for it in + * bch2_journal_space_available(): + */ + w->sectors = 0; + + /* + * journal entry has been compacted and allocated, recalculate space + * available: + */ + bch2_journal_space_available(j); + spin_unlock(&j->lock); + + w->devs_written = bch2_bkey_devs(bkey_i_to_s_c(&w->key)); + + if (c->opts.nochanges) + goto no_io; + + for_each_rw_member(c, ca) + nr_rw_members++; + + if (nr_rw_members > 1) + w->separate_flush = true; + + /* + * Mark journal replicas before we submit the write to guarantee + * recovery will find the journal entries after a crash. + */ + bch2_devlist_to_replicas(&replicas.e, BCH_DATA_journal, + w->devs_written); + ret = bch2_mark_replicas(c, &replicas.e); + if (ret) + goto err; + + if (!JSET_NO_FLUSH(w->data) && w->separate_flush) { + for_each_rw_member(c, ca) { + percpu_ref_get(&ca->io_ref); + + bio = ca->journal.bio; + bio_reset(bio, ca->disk_sb.bdev, REQ_OP_FLUSH); + bio->bi_end_io = journal_write_endio; + bio->bi_private = ca; + closure_bio_submit(bio, cl); + } + } + + continue_at(cl, do_journal_write, c->io_complete_wq); + return; +no_io: + continue_at(cl, journal_write_done, c->io_complete_wq); + return; +err: + bch2_fatal_error(c); + continue_at(cl, journal_write_done, c->io_complete_wq); +} |