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bcachefs: Improved superblock-related error messages

Browse Source 
This patch converts bch2_sb_validate() and the .validate methods for the
various superblock sections to take printbuf, to which they can print
detailed error messages, including printing the entire section that was
invalid.

This is a great improvement over the previous situation, where we could
only return static strings that didn't have precise information about
what was wrong.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
This commit is contained in:
Kent Overstreet 2022-01-03 23:38:50 -05:00 committed by Kent Overstreet
parent fe312f81ef
commit efe68e1d65
8 changed files with 449 additions and 397 deletions
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62
fs/bcachefs/disk_groups.c
View File

@ -17,24 +17,20 @@ static int group_cmp(const void *_l, const void *_r)
strncmp(l->label, r->label, sizeof(l->label));
}
static const char *bch2_sb_disk_groups_validate(struct bch_sb *sb,
struct bch_sb_field *f)
static int bch2_sb_disk_groups_validate(struct bch_sb *sb,
struct bch_sb_field *f,
struct printbuf *err)
{
struct bch_sb_field_disk_groups *groups =
field_to_type(f, disk_groups);
struct bch_disk_group *g, *sorted = NULL;
struct bch_sb_field_members *mi;
struct bch_member *m;
unsigned i, nr_groups, len;
const char *err = NULL;
struct bch_sb_field_members *mi = bch2_sb_get_members(sb);
unsigned nr_groups = disk_groups_nr(groups);
unsigned i, len;
int ret = -EINVAL;
mi = bch2_sb_get_members(sb);
groups = bch2_sb_get_disk_groups(sb);
nr_groups = disk_groups_nr(groups);
for (m = mi->members;
m < mi->members + sb->nr_devices;
m++) {
for (i = 0; i < sb->nr_devices; i++) {
struct bch_member *m = mi->members + i;
unsigned g;
if (!BCH_MEMBER_GROUP(m))
@ -42,45 +38,53 @@ static const char *bch2_sb_disk_groups_validate(struct bch_sb *sb,
g = BCH_MEMBER_GROUP(m) - 1;
if (g >= nr_groups ||
BCH_GROUP_DELETED(&groups->entries[g]))
return "disk has invalid group";
if (g >= nr_groups) {
pr_buf(err, "disk %u has invalid label %u (have %u)",
i, g, nr_groups);
return -EINVAL;
}
if (BCH_GROUP_DELETED(&groups->entries[g])) {
pr_buf(err, "disk %u has deleted label %u", i, g);
return -EINVAL;
}
}
if (!nr_groups)
return NULL;
return 0;
for (i = 0; i < nr_groups; i++) {
g = groups->entries + i;
for (g = groups->entries;
g < groups->entries + nr_groups;
g++) {
if (BCH_GROUP_DELETED(g))
continue;
len = strnlen(g->label, sizeof(g->label));
if (!len) {
err = "group with empty label";
goto err;
pr_buf(err, "label %u empty", i);
return -EINVAL;
}
}
sorted = kmalloc_array(nr_groups, sizeof(*sorted), GFP_KERNEL);
if (!sorted)
return "cannot allocate memory";
return -ENOMEM;
memcpy(sorted, groups->entries, nr_groups * sizeof(*sorted));
sort(sorted, nr_groups, sizeof(*sorted), group_cmp, NULL);
for (i = 0; i + 1 < nr_groups; i++)
if (!BCH_GROUP_DELETED(sorted + i) &&
!group_cmp(sorted + i, sorted + i + 1)) {
err = "duplicate groups";
for (g = sorted; g + 1 < sorted + nr_groups; g++)
if (!BCH_GROUP_DELETED(g) &&
!group_cmp(&g[0], &g[1])) {
pr_buf(err, "duplicate label %llu.", BCH_GROUP_PARENT(g));
bch_scnmemcpy(err, g->label, strnlen(g->label, sizeof(g->label)));
goto err;
}
err = NULL;
ret = 0;
err:
kfree(sorted);
return err;
return 0;
}
static void bch2_sb_disk_groups_to_text(struct printbuf *out,

35
fs/bcachefs/journal_seq_blacklist.c
View File

@ -189,27 +189,34 @@ int bch2_blacklist_table_initialize(struct bch_fs *c)
return 0;
}
static const char *
bch2_sb_journal_seq_blacklist_validate(struct bch_sb *sb,
struct bch_sb_field *f)
static int bch2_sb_journal_seq_blacklist_validate(struct bch_sb *sb,
struct bch_sb_field *f,
struct printbuf *err)
{
struct bch_sb_field_journal_seq_blacklist *bl =
field_to_type(f, journal_seq_blacklist);
struct journal_seq_blacklist_entry *i;
unsigned nr = blacklist_nr_entries(bl);
unsigned i, nr = blacklist_nr_entries(bl);
for (i = bl->start; i < bl->start + nr; i++) {
if (le64_to_cpu(i->start) >=
le64_to_cpu(i->end))
return "entry start >= end";
for (i = 0; i < nr; i++) {
struct journal_seq_blacklist_entry *e = bl->start + i;
if (i + 1 < bl->start + nr &&
le64_to_cpu(i[0].end) >
le64_to_cpu(i[1].start))
return "entries out of order";
if (le64_to_cpu(e->start) >=
le64_to_cpu(e->end)) {
pr_buf(err, "entry %u start >= end (%llu >= %llu)",
i, le64_to_cpu(e->start), le64_to_cpu(e->end));
return -EINVAL;
}
if (i + 1 < nr &&
le64_to_cpu(e[0].end) >
le64_to_cpu(e[1].start)) {
pr_buf(err, "entry %u out of order with next entry (%llu > %llu)",
i + 1, le64_to_cpu(e[0].end), le64_to_cpu(e[1].start));
return -EINVAL;
}
}
return NULL;
return 0;
}
static void bch2_sb_journal_seq_blacklist_to_text(struct printbuf *out,

12
fs/bcachefs/quota.c
View File

@ -6,15 +6,17 @@
#include "subvolume.h"
#include "super-io.h"
static const char *bch2_sb_validate_quota(struct bch_sb *sb,
struct bch_sb_field *f)
static int bch2_sb_validate_quota(struct bch_sb *sb, struct bch_sb_field *f,
struct printbuf *err)
{
struct bch_sb_field_quota *q = field_to_type(f, quota);
if (vstruct_bytes(&q->field) != sizeof(*q))
return "invalid field quota: wrong size";
if (vstruct_bytes(&q->field) < sizeof(*q)) {
pr_buf(err, "wrong size (got %llu should be %zu)",
vstruct_bytes(&q->field), sizeof(*q));
}
return NULL;
return 0;
}
const struct bch_sb_field_ops bch_sb_field_ops_quota = {

137
fs/bcachefs/replicas.c
View File

@ -41,18 +41,19 @@ void bch2_replicas_entry_to_text(struct printbuf *out,
{
unsigned i;
pr_buf(out, "%s: %u/%u [",
bch2_data_types[e->data_type],
e->nr_required,
e->nr_devs);
if (e->data_type < BCH_DATA_NR)
pr_buf(out, "%s", bch2_data_types[e->data_type]);
else
pr_buf(out, "(invalid data type %u)", e->data_type);
pr_buf(out, ": %u/%u [", e->nr_required, e->nr_devs);
for (i = 0; i < e->nr_devs; i++)
pr_buf(out, i ? " %u" : "%u", e->devs[i]);
pr_buf(out, "]");
}
void bch2_cpu_replicas_to_text(struct printbuf *out,
struct bch_replicas_cpu *r)
struct bch_replicas_cpu *r)
{
struct bch_replicas_entry *e;
bool first = true;
@ -815,67 +816,78 @@ static int bch2_cpu_replicas_to_sb_replicas(struct bch_fs *c,
return 0;
}
static const char *check_dup_replicas_entries(struct bch_replicas_cpu *cpu_r)
static int bch2_cpu_replicas_validate(struct bch_replicas_cpu *cpu_r,
struct bch_sb *sb,
struct printbuf *err)
{
unsigned i;
struct bch_sb_field_members *mi = bch2_sb_get_members(sb);
unsigned i, j;
sort_cmp_size(cpu_r->entries,
cpu_r->nr,
cpu_r->entry_size,
memcmp, NULL);
for (i = 0; i + 1 < cpu_r->nr; i++) {
struct bch_replicas_entry *l =
for (i = 0; i < cpu_r->nr; i++) {
struct bch_replicas_entry *e =
cpu_replicas_entry(cpu_r, i);
struct bch_replicas_entry *r =
cpu_replicas_entry(cpu_r, i + 1);
BUG_ON(memcmp(l, r, cpu_r->entry_size) > 0);
if (e->data_type >= BCH_DATA_NR) {
pr_buf(err, "invalid data type in entry ");
bch2_replicas_entry_to_text(err, e);
return -EINVAL;
}
if (!memcmp(l, r, cpu_r->entry_size))
return "duplicate replicas entry";
if (!e->nr_devs) {
pr_buf(err, "no devices in entry ");
bch2_replicas_entry_to_text(err, e);
return -EINVAL;
}
if (e->nr_required > 1 &&
e->nr_required >= e->nr_devs) {
pr_buf(err, "bad nr_required in entry ");
bch2_replicas_entry_to_text(err, e);
return -EINVAL;
}
for (j = 0; j < e->nr_devs; j++)
if (!bch2_dev_exists(sb, mi, e->devs[j])) {
pr_buf(err, "invalid device %u in entry ", e->devs[j]);
bch2_replicas_entry_to_text(err, e);
return -EINVAL;
}
if (i + 1 < cpu_r->nr) {
struct bch_replicas_entry *n =
cpu_replicas_entry(cpu_r, i + 1);
BUG_ON(memcmp(e, n, cpu_r->entry_size) > 0);
if (!memcmp(e, n, cpu_r->entry_size)) {
pr_buf(err, "duplicate replicas entry ");
bch2_replicas_entry_to_text(err, e);
return -EINVAL;
}
}
}
return NULL;
return 0;
}
static const char *bch2_sb_validate_replicas(struct bch_sb *sb, struct bch_sb_field *f)
static int bch2_sb_validate_replicas(struct bch_sb *sb, struct bch_sb_field *f,
struct printbuf *err)
{
struct bch_sb_field_replicas *sb_r = field_to_type(f, replicas);
struct bch_sb_field_members *mi = bch2_sb_get_members(sb);
struct bch_replicas_cpu cpu_r = { .entries = NULL };
struct bch_replicas_entry *e;
const char *err;
unsigned i;
struct bch_replicas_cpu cpu_r;
int ret;
for_each_replicas_entry(sb_r, e) {
err = "invalid replicas entry: invalid data type";
if (e->data_type >= BCH_DATA_NR)
goto err;
err = "invalid replicas entry: no devices";
if (!e->nr_devs)
goto err;
err = "invalid replicas entry: bad nr_required";
if (e->nr_required > 1 &&
e->nr_required >= e->nr_devs)
goto err;
err = "invalid replicas entry: invalid device";
for (i = 0; i < e->nr_devs; i++)
if (!bch2_dev_exists(sb, mi, e->devs[i]))
goto err;
}
err = "cannot allocate memory";
if (__bch2_sb_replicas_to_cpu_replicas(sb_r, &cpu_r))
goto err;
return -ENOMEM;
err = check_dup_replicas_entries(&cpu_r);
err:
ret = bch2_cpu_replicas_validate(&cpu_r, sb, err);
kfree(cpu_r.entries);
return err;
return ret;
}
static void bch2_sb_replicas_to_text(struct printbuf *out,
@ -900,38 +912,19 @@ const struct bch_sb_field_ops bch_sb_field_ops_replicas = {
.to_text = bch2_sb_replicas_to_text,
};
static const char *bch2_sb_validate_replicas_v0(struct bch_sb *sb, struct bch_sb_field *f)
static int bch2_sb_validate_replicas_v0(struct bch_sb *sb, struct bch_sb_field *f,
struct printbuf *err)
{
struct bch_sb_field_replicas_v0 *sb_r = field_to_type(f, replicas_v0);
struct bch_sb_field_members *mi = bch2_sb_get_members(sb);
struct bch_replicas_cpu cpu_r = { .entries = NULL };
struct bch_replicas_entry_v0 *e;
const char *err;
unsigned i;
struct bch_replicas_cpu cpu_r;
int ret;
for_each_replicas_entry_v0(sb_r, e) {
err = "invalid replicas entry: invalid data type";
if (e->data_type >= BCH_DATA_NR)
goto err;
err = "invalid replicas entry: no devices";
if (!e->nr_devs)
goto err;
err = "invalid replicas entry: invalid device";
for (i = 0; i < e->nr_devs; i++)
if (!bch2_dev_exists(sb, mi, e->devs[i]))
goto err;
}
err = "cannot allocate memory";
if (__bch2_sb_replicas_v0_to_cpu_replicas(sb_r, &cpu_r))
goto err;
return -ENOMEM;
err = check_dup_replicas_entries(&cpu_r);
err:
ret = bch2_cpu_replicas_validate(&cpu_r, sb, err);
kfree(cpu_r.entries);
return err;
return ret;
}
const struct bch_sb_field_ops bch_sb_field_ops_replicas_v0 = {

466
fs/bcachefs/super-io.c
View File

@ -30,8 +30,8 @@ const char * const bch2_sb_fields[] = {
NULL
};
static const char *bch2_sb_field_validate(struct bch_sb *,
struct bch_sb_field *);
static int bch2_sb_field_validate(struct bch_sb *, struct bch_sb_field *,
struct printbuf *);
struct bch_sb_field *bch2_sb_field_get(struct bch_sb *sb,
enum bch_sb_field_type type)
@ -207,23 +207,32 @@ static inline void __bch2_sb_layout_size_assert(void)
BUILD_BUG_ON(sizeof(struct bch_sb_layout) != 512);
}
static const char *validate_sb_layout(struct bch_sb_layout *layout)
static int validate_sb_layout(struct bch_sb_layout *layout, struct printbuf *out)
{
u64 offset, prev_offset, max_sectors;
unsigned i;
if (!uuid_equal(&layout->magic, &BCACHE_MAGIC) &&
!uuid_equal(&layout->magic, &BCHFS_MAGIC))
return "Not a bcachefs superblock layout";
!uuid_equal(&layout->magic, &BCHFS_MAGIC)) {
pr_buf(out, "Not a bcachefs superblock layout");
return -EINVAL;
}
if (layout->layout_type != 0)
return "Invalid superblock layout type";
if (layout->layout_type != 0) {
pr_buf(out, "Invalid superblock layout type %u",
layout->layout_type);
return -EINVAL;
}
if (!layout->nr_superblocks)
return "Invalid superblock layout: no superblocks";
if (!layout->nr_superblocks) {
pr_buf(out, "Invalid superblock layout: no superblocks");
return -EINVAL;
}
if (layout->nr_superblocks > ARRAY_SIZE(layout->sb_offset))
return "Invalid superblock layout: too many superblocks";
if (layout->nr_superblocks > ARRAY_SIZE(layout->sb_offset)) {
pr_buf(out, "Invalid superblock layout: too many superblocks");
return -EINVAL;
}
max_sectors = 1 << layout->sb_max_size_bits;
@ -232,122 +241,134 @@ static const char *validate_sb_layout(struct bch_sb_layout *layout)
for (i = 1; i < layout->nr_superblocks; i++) {
offset = le64_to_cpu(layout->sb_offset[i]);
if (offset < prev_offset + max_sectors)
return "Invalid superblock layout: superblocks overlap";
if (offset < prev_offset + max_sectors) {
pr_buf(out, "Invalid superblock layout: superblocks overlap\n"
" (sb %u ends at %llu next starts at %llu",
i - 1, prev_offset + max_sectors, offset);
return -EINVAL;
}
prev_offset = offset;
}
return NULL;
return 0;
}
const char *bch2_sb_validate(struct bch_sb_handle *disk_sb)
static int bch2_sb_validate(struct bch_sb_handle *disk_sb, struct printbuf *out)
{
struct bch_sb *sb = disk_sb->sb;
struct bch_sb_field *f;
struct bch_sb_field_members *mi;
const char *err;
u32 version, version_min;
u16 block_size;
int ret;
version = le16_to_cpu(sb->version);
version_min = version >= bcachefs_metadata_version_new_versioning
? le16_to_cpu(sb->version_min)
: version;
if (version >= bcachefs_metadata_version_max ||
version_min < bcachefs_metadata_version_min)
return "Unsupported superblock version";
if (version >= bcachefs_metadata_version_max) {
pr_buf(out, "Unsupported superblock version %u (min %u, max %u)",
version, bcachefs_metadata_version_min, bcachefs_metadata_version_max);
return -EINVAL;
}
if (version_min > version)
return "Bad minimum version";
if (version_min < bcachefs_metadata_version_min) {
pr_buf(out, "Unsupported superblock version %u (min %u, max %u)",
version_min, bcachefs_metadata_version_min, bcachefs_metadata_version_max);
return -EINVAL;
}
if (version_min > version) {
pr_buf(out, "Bad minimum version %u, greater than version field %u",
version_min, version);
return -EINVAL;
}
if (sb->features[1] ||
(le64_to_cpu(sb->features[0]) & (~0ULL << BCH_FEATURE_NR)))
return "Filesystem has incompatible features";
(le64_to_cpu(sb->features[0]) & (~0ULL << BCH_FEATURE_NR))) {
pr_buf(out, "Filesystem has incompatible features");
return -EINVAL;
}
block_size = le16_to_cpu(sb->block_size);
if (block_size > PAGE_SECTORS)
return "Bad block size";
if (block_size > PAGE_SECTORS) {
pr_buf(out, "Block size too big (got %u, max %u)",
block_size, PAGE_SECTORS);
return -EINVAL;
}
if (bch2_is_zero(sb->user_uuid.b, sizeof(sb->user_uuid)))
return "Bad user UUID";
if (bch2_is_zero(sb->user_uuid.b, sizeof(sb->user_uuid))) {
pr_buf(out, "Bad user UUID (got zeroes)");
return -EINVAL;
}
if (bch2_is_zero(sb->uuid.b, sizeof(sb->uuid)))
return "Bad internal UUID";
if (bch2_is_zero(sb->uuid.b, sizeof(sb->uuid))) {
pr_buf(out, "Bad intenal UUID (got zeroes)");
return -EINVAL;
}
if (!sb->nr_devices ||
sb->nr_devices <= sb->dev_idx ||
sb->nr_devices > BCH_SB_MEMBERS_MAX)
return "Bad number of member devices";
sb->nr_devices > BCH_SB_MEMBERS_MAX) {
pr_buf(out, "Bad number of member devices %u (max %u)",
sb->nr_devices, BCH_SB_MEMBERS_MAX);
return -EINVAL;
}
if (!BCH_SB_META_REPLICAS_WANT(sb) ||
BCH_SB_META_REPLICAS_WANT(sb) > BCH_REPLICAS_MAX)
return "Invalid number of metadata replicas";
if (!BCH_SB_META_REPLICAS_REQ(sb) ||
BCH_SB_META_REPLICAS_REQ(sb) > BCH_REPLICAS_MAX)
return "Invalid number of metadata replicas";
if (!BCH_SB_DATA_REPLICAS_WANT(sb) ||
BCH_SB_DATA_REPLICAS_WANT(sb) > BCH_REPLICAS_MAX)
return "Invalid number of data replicas";
if (!BCH_SB_DATA_REPLICAS_REQ(sb) ||
BCH_SB_DATA_REPLICAS_REQ(sb) > BCH_REPLICAS_MAX)
return "Invalid number of data replicas";
if (BCH_SB_META_CSUM_TYPE(sb) >= BCH_CSUM_OPT_NR)
return "Invalid metadata checksum type";
if (BCH_SB_DATA_CSUM_TYPE(sb) >= BCH_CSUM_OPT_NR)
return "Invalid metadata checksum type";
if (BCH_SB_COMPRESSION_TYPE(sb) >= BCH_COMPRESSION_OPT_NR)
return "Invalid compression type";
if (!BCH_SB_BTREE_NODE_SIZE(sb))
return "Btree node size not set";
if (BCH_SB_GC_RESERVE(sb) < 5)
return "gc reserve percentage too small";
if (sb->dev_idx >= sb->nr_devices) {
pr_buf(out, "Bad dev_idx (got %u, nr_devices %u)",
sb->dev_idx, sb->nr_devices);
return -EINVAL;
}
if (!sb->time_precision ||
le32_to_cpu(sb->time_precision) > NSEC_PER_SEC)
return "invalid time precision";
le32_to_cpu(sb->time_precision) > NSEC_PER_SEC) {
pr_buf(out, "Invalid time precision: %u (min 1, max %lu)",
le32_to_cpu(sb->time_precision), NSEC_PER_SEC);
return -EINVAL;
}
/* validate layout */
err = validate_sb_layout(&sb->layout);
if (err)
return err;
ret = validate_sb_layout(&sb->layout, out);
if (ret)
return ret;
vstruct_for_each(sb, f) {
if (!f->u64s)
return "Invalid superblock: invalid optional field";
if (!f->u64s) {
pr_buf(out, "Invalid superblock: optional with size 0 (type %u)",
le32_to_cpu(f->type));
return -EINVAL;
}
if (vstruct_next(f) > vstruct_last(sb))
return "Invalid superblock: invalid optional field";
if (vstruct_next(f) > vstruct_last(sb)) {
pr_buf(out, "Invalid superblock: optional field extends past end of superblock (type %u)",
le32_to_cpu(f->type));
return -EINVAL;
}
}
/* members must be validated first: */
mi = bch2_sb_get_members(sb);
if (!mi)
return "Invalid superblock: member info area missing";
if (!mi) {
pr_buf(out, "Invalid superblock: member info area missing");
return -EINVAL;
}
err = bch2_sb_field_validate(sb, &mi->field);
if (err)
return err;
ret = bch2_sb_field_validate(sb, &mi->field, out);
if (ret)
return ret;
vstruct_for_each(sb, f) {
if (le32_to_cpu(f->type) == BCH_SB_FIELD_members)
continue;
err = bch2_sb_field_validate(sb, f);
if (err)
return err;
ret = bch2_sb_field_validate(sb, f, out);
if (ret)
return ret;
}
return NULL;
return 0;
}
/* device open: */
@ -476,50 +497,77 @@ int bch2_sb_from_fs(struct bch_fs *c, struct bch_dev *ca)
/* read superblock: */
static const char *read_one_super(struct bch_sb_handle *sb, u64 offset)
static int read_one_super(struct bch_sb_handle *sb, u64 offset, struct printbuf *err)
{
struct bch_csum csum;
u32 version, version_min;
size_t bytes;
int ret;
reread:
bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META);
sb->bio->bi_iter.bi_sector = offset;
bch2_bio_map(sb->bio, sb->sb, sb->buffer_size);
if (submit_bio_wait(sb->bio))
return "IO error";
ret = submit_bio_wait(sb->bio);
if (ret) {
pr_buf(err, "IO error: %i", ret);
return ret;
}
if (!uuid_equal(&sb->sb->magic, &BCACHE_MAGIC) &&
!uuid_equal(&sb->sb->magic, &BCHFS_MAGIC))
return "Not a bcachefs superblock";
!uuid_equal(&sb->sb->magic, &BCHFS_MAGIC)) {
pr_buf(err, "Not a bcachefs superblock");
return -EINVAL;
}
if (le16_to_cpu(sb->sb->version) < bcachefs_metadata_version_min ||
le16_to_cpu(sb->sb->version) >= bcachefs_metadata_version_max)
return "Unsupported superblock version";
version = le16_to_cpu(sb->sb->version);
version_min = version >= bcachefs_metadata_version_new_versioning
? le16_to_cpu(sb->sb->version_min)
: version;
if (version >= bcachefs_metadata_version_max) {
pr_buf(err, "Unsupported superblock version %u (min %u, max %u)",
version, bcachefs_metadata_version_min, bcachefs_metadata_version_max);
return -EINVAL;
}
if (version_min < bcachefs_metadata_version_min) {
pr_buf(err, "Unsupported superblock version %u (min %u, max %u)",
version_min, bcachefs_metadata_version_min, bcachefs_metadata_version_max);
return -EINVAL;
}
bytes = vstruct_bytes(sb->sb);
if (bytes > 512 << sb->sb->layout.sb_max_size_bits)
return "Bad superblock: too big";
if (bytes > 512 << sb->sb->layout.sb_max_size_bits) {
pr_buf(err, "Invalid superblock: too big (got %zu bytes, layout max %lu)",
bytes, 512UL << sb->sb->layout.sb_max_size_bits);
return -EINVAL;
}
if (bytes > sb->buffer_size) {
if (bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s)))
return "cannot allocate memory";
return -ENOMEM;
goto reread;
}
if (BCH_SB_CSUM_TYPE(sb->sb) >= BCH_CSUM_NR)
return "unknown csum type";
if (BCH_SB_CSUM_TYPE(sb->sb) >= BCH_CSUM_NR) {
pr_buf(err, "unknown checksum type %llu", BCH_SB_CSUM_TYPE(sb->sb));
return -EINVAL;
}
/* XXX: verify MACs */
csum = csum_vstruct(NULL, BCH_SB_CSUM_TYPE(sb->sb),
null_nonce(), sb->sb);
if (bch2_crc_cmp(csum, sb->sb->csum))
return "bad checksum reading superblock";
if (bch2_crc_cmp(csum, sb->sb->csum)) {
pr_buf(err, "bad checksum");
return -EINVAL;
}
sb->seq = le64_to_cpu(sb->sb->seq);
return NULL;
return 0;
}
int bch2_read_super(const char *path, struct bch_opts *opts,
@ -527,10 +575,16 @@ int bch2_read_super(const char *path, struct bch_opts *opts,
{
u64 offset = opt_get(*opts, sb);
struct bch_sb_layout layout;
const char *err;
char *_err;
struct printbuf err;
__le64 *i;
int ret;
_err = kmalloc(4096, GFP_KERNEL);
if (!_err)
return -ENOMEM;
err = _PBUF(_err, 4096);
pr_verbose_init(*opts, "");
memset(sb, 0, sizeof(*sb));
@ -562,25 +616,28 @@ int bch2_read_super(const char *path, struct bch_opts *opts,
goto out;
}
err = "cannot allocate memory";
ret = bch2_sb_realloc(sb, 0);
if (ret)
if (ret) {
pr_buf(&err, "error allocating memory for superblock");
goto err;
}
ret = -EFAULT;
err = "dynamic fault";
if (bch2_fs_init_fault("read_super"))
if (bch2_fs_init_fault("read_super")) {
pr_buf(&err, "dynamic fault");
ret = -EFAULT;
goto err;
}
ret = -EINVAL;
err = read_one_super(sb, offset);
if (!err)
ret = read_one_super(sb, offset, &err);
if (!ret)
goto got_super;
if (opt_defined(*opts, sb))
goto err;
pr_err("error reading default superblock: %s", err);
printk(KERN_ERR "bcachefs (%s): error reading default superblock: %s",
path, _err);
err = _PBUF(_err, 4096);
/*
* Error reading primary superblock - read location of backup
@ -594,13 +651,15 @@ int bch2_read_super(const char *path, struct bch_opts *opts,
*/
bch2_bio_map(sb->bio, sb->sb, sizeof(struct bch_sb_layout));
err = "IO error";
if (submit_bio_wait(sb->bio))
ret = submit_bio_wait(sb->bio);
if (ret) {
pr_buf(&err, "IO error: %i", ret);
goto err;
}
memcpy(&layout, sb->sb, sizeof(layout));
err = validate_sb_layout(&layout);
if (err)
ret = validate_sb_layout(&layout, &err);
if (ret)
goto err;
for (i = layout.sb_offset;
@ -610,32 +669,39 @@ int bch2_read_super(const char *path, struct bch_opts *opts,
if (offset == opt_get(*opts, sb))
continue;
err = read_one_super(sb, offset);
if (!err)
ret = read_one_super(sb, offset, &err);
if (!ret)
goto got_super;
}
ret = -EINVAL;
goto err;
got_super:
err = "Superblock block size smaller than device block size";
ret = -EINVAL;
if (le16_to_cpu(sb->sb->block_size) << 9 <
bdev_logical_block_size(sb->bdev)) {
pr_err("error reading superblock: Superblock block size (%u) smaller than device block size (%u)",
pr_buf(&err, "block size (%u) smaller than device block size (%u)",
le16_to_cpu(sb->sb->block_size) << 9,
bdev_logical_block_size(sb->bdev));
goto err_no_print;
ret = -EINVAL;
goto err;
}
ret = 0;
sb->have_layout = true;
ret = bch2_sb_validate(sb, &err);
if (ret) {
printk(KERN_ERR "bcachefs (%s): error validating superblock: %s",
path, _err);
goto err_no_print;
}
out:
pr_verbose_init(*opts, "ret %i", ret);
kfree(_err);
return ret;
err:
pr_err("error reading superblock: %s", err);
printk(KERN_ERR "bcachefs (%s): error reading superblock: %s",
path, _err);
err_no_print:
bch2_free_super(sb);
goto out;
@ -706,7 +772,6 @@ int bch2_write_super(struct bch_fs *c)
struct closure *cl = &c->sb_write;
struct bch_dev *ca;
unsigned i, sb = 0, nr_wrote;
const char *err;
struct bch_devs_mask sb_written;
bool wrote, can_mount_without_written, can_mount_with_written;
unsigned degraded_flags = BCH_FORCE_IF_DEGRADED;
@ -733,10 +798,19 @@ int bch2_write_super(struct bch_fs *c)
bch2_sb_from_fs(c, ca);
for_each_online_member(ca, c, i) {
err = bch2_sb_validate(&ca->disk_sb);
if (err) {
bch2_fs_inconsistent(c, "sb invalid before write: %s", err);
ret = -1;
struct printbuf buf = { NULL, NULL };
ret = bch2_sb_validate(&ca->disk_sb, &buf);
if (ret) {
char *_buf = kmalloc(4096, GFP_NOFS);
if (_buf) {
buf = _PBUF(_buf, 4096);
bch2_sb_validate(&ca->disk_sb, &buf);
}
bch2_fs_inconsistent(c, "sb invalid before write: %s", _buf);
kfree(_buf);
percpu_ref_put(&ca->io_ref);
goto out;
}
}
@ -849,54 +923,57 @@ static int u64_cmp(const void *_l, const void *_r)
return l < r ? -1 : l > r ? 1 : 0;
}
static const char *bch2_sb_validate_journal(struct bch_sb *sb,
struct bch_sb_field *f)
static int bch2_sb_validate_journal(struct bch_sb *sb,
struct bch_sb_field *f,
struct printbuf *err)
{
struct bch_sb_field_journal *journal = field_to_type(f, journal);
struct bch_member *m = bch2_sb_get_members(sb)->members + sb->dev_idx;
const char *err;
int ret = -EINVAL;
unsigned nr;
unsigned i;
u64 *b;
journal = bch2_sb_get_journal(sb);
if (!journal)
return NULL;
nr = bch2_nr_journal_buckets(journal);
if (!nr)
return NULL;
return 0;
b = kmalloc_array(sizeof(u64), nr, GFP_KERNEL);
if (!b)
return "cannot allocate memory";
return -ENOMEM;
for (i = 0; i < nr; i++)
b[i] = le64_to_cpu(journal->buckets[i]);
sort(b, nr, sizeof(u64), u64_cmp, NULL);
err = "journal bucket at sector 0";
if (!b[0])
if (!b[0]) {
pr_buf(err, "journal bucket at sector 0");
goto err;
}
err = "journal bucket before first bucket";
if (m && b[0] < le16_to_cpu(m->first_bucket))
if (b[0] < le16_to_cpu(m->first_bucket)) {
pr_buf(err, "journal bucket %llu before first bucket %u",
b[0], le16_to_cpu(m->first_bucket));
goto err;
}
err = "journal bucket past end of device";
if (m && b[nr - 1] >= le64_to_cpu(m->nbuckets))
if (b[nr - 1] >= le64_to_cpu(m->nbuckets)) {
pr_buf(err, "journal bucket %llu past end of device (nbuckets %llu)",
b[nr - 1], le64_to_cpu(m->nbuckets));
goto err;
}
err = "duplicate journal buckets";
for (i = 0; i + 1 < nr; i++)
if (b[i] == b[i + 1])
if (b[i] == b[i + 1]) {
pr_buf(err, "duplicate journal buckets %llu", b[i]);
goto err;
}
err = NULL;
ret = 0;
err:
kfree(b);
return err;
return ret;
}
static const struct bch_sb_field_ops bch_sb_field_ops_journal = {
@ -905,39 +982,54 @@ static const struct bch_sb_field_ops bch_sb_field_ops_journal = {
/* BCH_SB_FIELD_members: */
static const char *bch2_sb_validate_members(struct bch_sb *sb,
struct bch_sb_field *f)
static int bch2_sb_validate_members(struct bch_sb *sb,
struct bch_sb_field *f,
struct printbuf *err)
{
struct bch_sb_field_members *mi = field_to_type(f, members);
struct bch_member *m;
unsigned i;
if ((void *) (mi->members + sb->nr_devices) >
vstruct_end(&mi->field))
return "Invalid superblock: bad member info";
vstruct_end(&mi->field)) {
pr_buf(err, "too many devices for section size");
return -EINVAL;
}
for (i = 0; i < sb->nr_devices; i++) {
struct bch_member *m = mi->members + i;
for (m = mi->members;
m < mi->members + sb->nr_devices;
m++) {
if (!bch2_member_exists(m))
continue;
if (le64_to_cpu(m->nbuckets) > LONG_MAX)
return "Too many buckets";
if (le64_to_cpu(m->nbuckets) > LONG_MAX) {
pr_buf(err, "device %u: too many buckets (got %llu, max %lu)",
i, le64_to_cpu(m->nbuckets), LONG_MAX);
return -EINVAL;
}
if (le64_to_cpu(m->nbuckets) -
le16_to_cpu(m->first_bucket) < BCH_MIN_NR_NBUCKETS)
return "Not enough buckets";
le16_to_cpu(m->first_bucket) < BCH_MIN_NR_NBUCKETS) {
pr_buf(err, "device %u: not enough buckets (got %llu, max %u)",
i, le64_to_cpu(m->nbuckets), BCH_MIN_NR_NBUCKETS);
return -EINVAL;
}
if (le16_to_cpu(m->bucket_size) <
le16_to_cpu(sb->block_size))
return "bucket size smaller than block size";
le16_to_cpu(sb->block_size)) {
pr_buf(err, "device %u: bucket size %u smaller than block size %u",
i, le16_to_cpu(m->bucket_size), le16_to_cpu(sb->block_size));
return -EINVAL;
}
if (le16_to_cpu(m->bucket_size) <
BCH_SB_BTREE_NODE_SIZE(sb))
return "bucket size smaller than btree node size";
BCH_SB_BTREE_NODE_SIZE(sb)) {
pr_buf(err, "device %u: bucket size %u smaller than btree node size %llu",
i, le16_to_cpu(m->bucket_size), BCH_SB_BTREE_NODE_SIZE(sb));
return -EINVAL;
}
}
return NULL;
return 0;
}
static const struct bch_sb_field_ops bch_sb_field_ops_members = {
@ -946,18 +1038,24 @@ static const struct bch_sb_field_ops bch_sb_field_ops_members = {
/* BCH_SB_FIELD_crypt: */
static const char *bch2_sb_validate_crypt(struct bch_sb *sb,
struct bch_sb_field *f)
static int bch2_sb_validate_crypt(struct bch_sb *sb,
struct bch_sb_field *f,
struct printbuf *err)
{
struct bch_sb_field_crypt *crypt = field_to_type(f, crypt);
if (vstruct_bytes(&crypt->field) != sizeof(*crypt))
return "invalid field crypt: wrong size";
if (vstruct_bytes(&crypt->field) < sizeof(*crypt)) {
pr_buf(err, "wrong size (got %llu should be %zu)",
vstruct_bytes(&crypt->field), sizeof(*crypt));
return -EINVAL;
}
if (BCH_CRYPT_KDF_TYPE(crypt))
return "invalid field crypt: bad kdf type";
if (BCH_CRYPT_KDF_TYPE(crypt)) {
pr_buf(err, "bad kdf type %llu", BCH_CRYPT_KDF_TYPE(crypt));
return -EINVAL;
}
return NULL;
return 0;
}
static const struct bch_sb_field_ops bch_sb_field_ops_crypt = {
@ -1167,15 +1265,19 @@ void bch2_fs_mark_clean(struct bch_fs *c)
mutex_unlock(&c->sb_lock);
}
static const char *bch2_sb_validate_clean(struct bch_sb *sb,
struct bch_sb_field *f)
static int bch2_sb_validate_clean(struct bch_sb *sb,
struct bch_sb_field *f,
struct printbuf *err)
{
struct bch_sb_field_clean *clean = field_to_type(f, clean);
if (vstruct_bytes(&clean->field) < sizeof(*clean))
return "invalid field crypt: wrong size";
if (vstruct_bytes(&clean->field) < sizeof(*clean)) {
pr_buf(err, "wrong size (got %llu should be %zu)",
vstruct_bytes(&clean->field), sizeof(*clean));
return -EINVAL;
}
return NULL;
return 0;
}
static const struct bch_sb_field_ops bch_sb_field_ops_clean = {
@ -1189,14 +1291,26 @@ static const struct bch_sb_field_ops *bch2_sb_field_ops[] = {
#undef x
};
static const char *bch2_sb_field_validate(struct bch_sb *sb,
struct bch_sb_field *f)
static int bch2_sb_field_validate(struct bch_sb *sb, struct bch_sb_field *f,
struct printbuf *orig_err)
{
unsigned type = le32_to_cpu(f->type);
struct printbuf err = *orig_err;
int ret;
return type < BCH_SB_FIELD_NR
? bch2_sb_field_ops[type]->validate(sb, f)
: NULL;
if (type >= BCH_SB_FIELD_NR)
return 0;
pr_buf(&err, "Invalid superblock section %s: ", bch2_sb_fields[type]);
ret = bch2_sb_field_ops[type]->validate(sb, f, &err);
if (ret) {
pr_buf(&err, "\n");
bch2_sb_field_to_text(&err, sb, f);
*orig_err = err;
}
return ret;
}
void bch2_sb_field_to_text(struct printbuf *out, struct bch_sb *sb,

7
fs/bcachefs/super-io.h
View File

@ -38,9 +38,8 @@ BCH_SB_FIELDS()
extern const char * const bch2_sb_fields[];
struct bch_sb_field_ops {
const char * (*validate)(struct bch_sb *, struct bch_sb_field *);
void (*to_text)(struct printbuf *, struct bch_sb *,
struct bch_sb_field *);
int (*validate)(struct bch_sb *, struct bch_sb_field *, struct printbuf *);
void (*to_text)(struct printbuf *, struct bch_sb *, struct bch_sb_field *);
};
static inline __le64 bch2_sb_magic(struct bch_fs *c)
@ -66,8 +65,6 @@ int bch2_sb_from_fs(struct bch_fs *, struct bch_dev *);
void bch2_free_super(struct bch_sb_handle *);
int bch2_sb_realloc(struct bch_sb_handle *, unsigned);
const char *bch2_sb_validate(struct bch_sb_handle *);
int bch2_read_super(const char *, struct bch_opts *, struct bch_sb_handle *);
int bch2_write_super(struct bch_fs *);
void __bch2_check_set_feature(struct bch_fs *, unsigned);

126
fs/bcachefs/super.c
View File

@ -1604,18 +1604,20 @@ int bch2_dev_add(struct bch_fs *c, const char *path)
struct bch_sb_field_members *mi;
struct bch_member dev_mi;
unsigned dev_idx, nr_devices, u64s;
char *_errbuf;
struct printbuf errbuf;
int ret;
_errbuf = kmalloc(4096, GFP_KERNEL);
if (!_errbuf)
return -ENOMEM;
errbuf = _PBUF(_errbuf, 4096);
ret = bch2_read_super(path, &opts, &sb);
if (ret) {
bch_err(c, "device add error: error reading super: %i", ret);
return ret;
}
err = bch2_sb_validate(&sb);
if (err) {
bch_err(c, "device add error: error validating super: %s", err);
return -EINVAL;
goto err;
}
dev_mi = bch2_sb_get_members(sb.sb)->members[sb.sb->dev_idx];
@ -1623,19 +1625,21 @@ int bch2_dev_add(struct bch_fs *c, const char *path)
err = bch2_dev_may_add(sb.sb, c);
if (err) {
bch_err(c, "device add error: %s", err);
return -EINVAL;
ret = -EINVAL;
goto err;
}
ca = __bch2_dev_alloc(c, &dev_mi);
if (!ca) {
bch2_free_super(&sb);
return -ENOMEM;
ret = -ENOMEM;
goto err;
}
ret = __bch2_dev_attach_bdev(ca, &sb);
if (ret) {
bch2_dev_free(ca);
return ret;
goto err;
}
ret = bch2_dev_journal_alloc(ca);
@ -1727,10 +1731,12 @@ int bch2_dev_add(struct bch_fs *c, const char *path)
if (ca)
bch2_dev_free(ca);
bch2_free_super(&sb);
kfree(_errbuf);
return ret;
err_late:
up_write(&c->state_lock);
return -EINVAL;
ca = NULL;
goto err;
}
/* Hot add existing device to running filesystem: */
@ -1896,20 +1902,28 @@ struct bch_fs *bch2_fs_open(char * const *devices, unsigned nr_devices,
struct bch_sb_field_members *mi;
unsigned i, best_sb = 0;
const char *err;
char *_errbuf = NULL;
struct printbuf errbuf;
int ret = 0;
if (!try_module_get(THIS_MODULE))
return ERR_PTR(-ENODEV);
pr_verbose_init(opts, "");
if (!nr_devices) {
c = ERR_PTR(-EINVAL);
goto out2;
ret = -EINVAL;
goto err;
}
if (!try_module_get(THIS_MODULE)) {
c = ERR_PTR(-ENODEV);
goto out2;
_errbuf = kmalloc(4096, GFP_KERNEL);
if (!_errbuf) {
ret = -ENOMEM;
goto err;
}
errbuf = _PBUF(_errbuf, 4096);
sb = kcalloc(nr_devices, sizeof(*sb), GFP_KERNEL);
if (!sb) {
ret = -ENOMEM;
@ -1921,9 +1935,6 @@ struct bch_fs *bch2_fs_open(char * const *devices, unsigned nr_devices,
if (ret)
goto err;
err = bch2_sb_validate(&sb[i]);
if (err)
goto err_print;
}
for (i = 1; i < nr_devices; i++)
@ -1976,8 +1987,8 @@ struct bch_fs *bch2_fs_open(char * const *devices, unsigned nr_devices,
}
out:
kfree(sb);
kfree(_errbuf);
module_put(THIS_MODULE);
out2:
pr_verbose_init(opts, "ret %i", PTR_ERR_OR_ZERO(c));
return c;
err_print:
@ -1994,81 +2005,6 @@ struct bch_fs *bch2_fs_open(char * const *devices, unsigned nr_devices,
goto out;
}
static const char *__bch2_fs_open_incremental(struct bch_sb_handle *sb,
struct bch_opts opts)
{
const char *err;
struct bch_fs *c;
bool allocated_fs = false;
int ret;
err = bch2_sb_validate(sb);
if (err)
return err;
mutex_lock(&bch_fs_list_lock);
c = __bch2_uuid_to_fs(sb->sb->uuid);
if (c) {
closure_get(&c->cl);
err = bch2_dev_in_fs(c->disk_sb.sb, sb->sb);
if (err)
goto err;
} else {
allocated_fs = true;
c = bch2_fs_alloc(sb->sb, opts);
err = "bch2_fs_alloc() error";
if (IS_ERR(c))
goto err;
}
err = "bch2_dev_online() error";
mutex_lock(&c->sb_lock);
if (bch2_dev_attach_bdev(c, sb)) {
mutex_unlock(&c->sb_lock);
goto err;
}
mutex_unlock(&c->sb_lock);
if (!c->opts.nostart && bch2_fs_may_start(c)) {
err = "error starting filesystem";
ret = bch2_fs_start(c);
if (ret)
goto err;
}
closure_put(&c->cl);
mutex_unlock(&bch_fs_list_lock);
return NULL;
err:
mutex_unlock(&bch_fs_list_lock);
if (allocated_fs && !IS_ERR(c))
bch2_fs_stop(c);
else if (c)
closure_put(&c->cl);
return err;
}
const char *bch2_fs_open_incremental(const char *path)
{
struct bch_sb_handle sb;
struct bch_opts opts = bch2_opts_empty();
const char *err;
if (bch2_read_super(path, &opts, &sb))
return "error reading superblock";
err = __bch2_fs_open_incremental(&sb, opts);
bch2_free_super(&sb);
return err;
}
/* Global interfaces/init */
static void bcachefs_exit(void)

1
fs/bcachefs/super.h
View File

@ -254,6 +254,5 @@ void bch2_fs_stop(struct bch_fs *);
int bch2_fs_start(struct bch_fs *);
struct bch_fs *bch2_fs_open(char * const *, unsigned, struct bch_opts);
const char *bch2_fs_open_incremental(const char *path);
#endif /* _BCACHEFS_SUPER_H */