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linux/fs/bcachefs/journal_io.c
Kent Overstreet 52f7d75e7d bcachefs: jset_entry_datetime 
This gives us a way to record the date and time every journal entry was
written - useful for debugging.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
2024-03-10 15:34:08 -04:00

2044 lines
53 KiB
C
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// 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"
void bch2_journal_ptrs_to_text(struct printbuf *out, struct bch_fs *c,
struct journal_replay *j)
{
darray_for_each(j->ptrs, i) {
struct bch_dev *ca = bch_dev_bkey_exists(c, i->dev);
u64 offset;
div64_u64_rem(i->sector, ca->mi.bucket_size, &offset);
if (i != j->ptrs.data)
prt_printf(out, " ");
prt_printf(out, "%u:%u:%u (sector %llu)",
i->dev, i->bucket, i->bucket_offset, i->sector);
}
}
static void bch2_journal_replay_to_text(struct printbuf *out, struct bch_fs *c,
struct journal_replay *j)
{
prt_printf(out, "seq %llu ", le64_to_cpu(j->j.seq));
bch2_journal_ptrs_to_text(out, c, j);
struct jset_entry *entry;
for_each_jset_entry_type(entry, &j->j, BCH_JSET_ENTRY_datetime) {
struct jset_entry_datetime *datetime =
container_of(entry, struct jset_entry_datetime, entry);
bch2_prt_datetime(out, le64_to_cpu(datetime->seconds));
break;
}
}
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;
size_t bytes = vstruct_bytes(j);
u64 last_seq = !JSET_NO_FLUSH(j) ? le64_to_cpu(j->last_seq) : 0;
struct printbuf buf = PRINTBUF;
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) {
bool identical = bytes == vstruct_bytes(&dup->j) &&
!memcmp(j, &dup->j, bytes);
bool not_identical = !identical &&
entry_ptr.csum_good &&
dup->csum_good;
bool same_device = false;
darray_for_each(dup->ptrs, ptr)
if (ptr->dev == ca->dev_idx)
same_device = true;
ret = darray_push(&dup->ptrs, entry_ptr);
if (ret)
goto out;
bch2_journal_replay_to_text(&buf, c, dup);
fsck_err_on(same_device,
c, journal_entry_dup_same_device,
"duplicate journal entry on same device\n %s",
buf.buf);
fsck_err_on(not_identical,
c, journal_entry_replicas_data_mismatch,
"found duplicate but non identical journal entries\n %s",
buf.buf);
if (entry_ptr.csum_good && !identical)
goto replace;
goto out;
}
replace:
i = kvpmalloc(offsetof(struct journal_replay, j) + bytes, GFP_KERNEL);
if (!i)
return -BCH_ERR_ENOMEM_journal_entry_add;
darray_init(&i->ptrs);
i->csum_good = entry_ptr.csum_good;
i->ignore = false;
unsafe_memcpy(&i->j, j, bytes, "embedded variable length struct");
if (dup) {
/* The first ptr should represent the jset we kept: */
darray_for_each(dup->ptrs, ptr)
darray_push(&i->ptrs, *ptr);
__journal_replay_free(c, dup);
} else {
darray_push(&i->ptrs, entry_ptr);
}
*_i = i;
out:
fsck_err:
printbuf_exit(&buf);
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++) {
bch2_prt_data_type(out, 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);
}
static int journal_entry_datetime_validate(struct bch_fs *c,
struct jset *jset,
struct jset_entry *entry,
unsigned version, int big_endian,
enum bkey_invalid_flags flags)
{
unsigned bytes = vstruct_bytes(entry);
unsigned expected = 16;
int ret = 0;
if (journal_entry_err_on(vstruct_bytes(entry) < 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;
}
fsck_err:
return ret;
}
static void journal_entry_datetime_to_text(struct printbuf *out, struct bch_fs *c,
struct jset_entry *entry)
{
struct jset_entry_datetime *datetime =
container_of(entry, struct jset_entry_datetime, entry);
bch2_prt_datetime(out, le64_to_cpu(datetime->seconds));
}
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;
darray_for_each(r->ptrs, i)
if (i->dev == ca->dev_idx) {
unsigned wrote = bucket_remainder(ca, i->sector) +
vstruct_sectors(&r->j, c->block_bits);
ja->cur_idx = 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;
}
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,
};
i = *_i;
if (!i || i->ignore)
continue;
darray_for_each(i->ptrs, ptr) {
struct bch_dev *ca = bch_dev_bkey_exists(c, ptr->dev);
if (!ptr->csum_good)
bch_err_dev_offset(ca, 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.data[0].dev),
&i->j,
i->ptrs.data[0].sector,
READ);
if (ret)
goto err;
darray_for_each(i->ptrs, ptr)
replicas.e.devs[replicas.e.nr_devs++] = 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);
unsigned replicas_need = min_t(unsigned, replicas_want,
READ_ONCE(c->opts.metadata_replicas_required));
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 >= replicas_need ? 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, j->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(j->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, j->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);
struct jset_entry_datetime *d =
container_of(jset_entry_init(&end, sizeof(*d)), struct jset_entry_datetime, entry);
d->entry.type = BCH_JSET_ENTRY_datetime;
d->seconds = cpu_to_le64(ktime_get_real_seconds());
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_WRITE|REQ_SYNC|REQ_META|REQ_PREFLUSH);
bio->bi_end_io = journal_write_endio;
bio->bi_private = ca;
closure_bio_submit(bio, cl);
}
}
continue_at(cl, do_journal_write, j->wq);
return;
no_io:
continue_at(cl, journal_write_done, j->wq);
return;
err:
bch2_fatal_error(c);
continue_at(cl, journal_write_done, j->wq);
}
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