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bcachefs: Improve btree node read error path

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This ensures that failure to read a btree node error is treated as a
topology error, and returns the correct error so that the topology
repair pass will be run.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-02-01 15:45:45 -05:00
parent 464b415539
commit 2e98404000
2 changed files with 42 additions and 24 deletions
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61
fs/bcachefs/btree_io.c
View file

@ -536,10 +536,23 @@ static void btree_err_msg(struct printbuf *out, struct bch_fs *c,
}
enum btree_err_type {
/*
* We can repair this locally, and we're after the checksum check so
* there's no need to try another replica:
*/
BTREE_ERR_FIXABLE,
/*
* We can repair this if we have to, but we should try reading another
* replica if we can:
*/
BTREE_ERR_WANT_RETRY,
/*
* Read another replica if we have one, otherwise consider the whole
* node bad:
*/
BTREE_ERR_MUST_RETRY,
BTREE_ERR_FATAL,
BTREE_ERR_BAD_NODE,
BTREE_ERR_INCOMPATIBLE,
};
enum btree_validate_ret {
@ -565,36 +578,40 @@ static int __btree_err(enum btree_err_type type,
prt_vprintf(&out, fmt, args);
va_end(args);
if (write == READ &&
type == BTREE_ERR_FIXABLE &&
!test_bit(BCH_FS_FSCK_DONE, &c->flags)) {
mustfix_fsck_err(c, "%s", out.buf);
goto out;
}
bch2_print_string_as_lines(KERN_ERR, out.buf);
if (write == WRITE) {
bch2_print_string_as_lines(KERN_ERR, out.buf);
ret = c->opts.errors == BCH_ON_ERROR_continue
? 0
: -BCH_ERR_fsck_errors_not_fixed;
goto out;
}
if (!have_retry && type == BTREE_ERR_WANT_RETRY)
type = BTREE_ERR_FIXABLE;
if (!have_retry && type == BTREE_ERR_MUST_RETRY)
type = BTREE_ERR_BAD_NODE;
switch (type) {
case BTREE_ERR_FIXABLE:
ret = -BCH_ERR_fsck_errors_not_fixed;
mustfix_fsck_err(c, "%s", out.buf);
ret = -BCH_ERR_fsck_fix;
break;
case BTREE_ERR_WANT_RETRY:
if (have_retry)
ret = BTREE_RETRY_READ;
break;
case BTREE_ERR_MUST_RETRY:
bch2_print_string_as_lines(KERN_ERR, out.buf);
ret = BTREE_RETRY_READ;
break;
case BTREE_ERR_FATAL:
case BTREE_ERR_BAD_NODE:
bch2_print_string_as_lines(KERN_ERR, out.buf);
bch2_topology_error(c);
ret = -BCH_ERR_need_topology_repair;
break;
case BTREE_ERR_INCOMPATIBLE:
bch2_print_string_as_lines(KERN_ERR, out.buf);
ret = -BCH_ERR_fsck_errors_not_fixed;
break;
default:
BUG();
}
out:
fsck_err:
@ -679,7 +696,7 @@ static int validate_bset(struct bch_fs *c, struct bch_dev *ca,
btree_err_on((version != BCH_BSET_VERSION_OLD &&
version < bcachefs_metadata_version_min) ||
version >= bcachefs_metadata_version_max,
BTREE_ERR_FATAL, c, ca, b, i,
BTREE_ERR_INCOMPATIBLE, c, ca, b, i,
"unsupported bset version");
if (btree_err_on(version < c->sb.version_min,
@ -703,7 +720,7 @@ static int validate_bset(struct bch_fs *c, struct bch_dev *ca,
}
btree_err_on(BSET_SEPARATE_WHITEOUTS(i),
BTREE_ERR_FATAL, c, ca, b, i,
BTREE_ERR_INCOMPATIBLE, c, ca, b, i,
"BSET_SEPARATE_WHITEOUTS no longer supported");
if (btree_err_on(offset + sectors > btree_sectors(c),
@ -780,7 +797,7 @@ static int validate_bset(struct bch_fs *c, struct bch_dev *ca,
err = bch2_bkey_format_validate(&bn->format);
btree_err_on(err,
BTREE_ERR_FATAL, c, ca, b, i,
BTREE_ERR_BAD_NODE, c, ca, b, i,
"invalid bkey format: %s", err);
compat_bformat(b->c.level, b->c.btree_id, version,
@ -969,7 +986,7 @@ int bch2_btree_node_read_done(struct bch_fs *c, struct bch_dev *ca,
btree_err_on(btree_node_type_is_extents(btree_node_type(b)) &&
!BTREE_NODE_NEW_EXTENT_OVERWRITE(b->data),
BTREE_ERR_FATAL, c, NULL, b, NULL,
BTREE_ERR_INCOMPATIBLE, c, NULL, b, NULL,
"btree node does not have NEW_EXTENT_OVERWRITE set");
sectors = vstruct_sectors(b->data, c->block_bits);
@ -1151,12 +1168,10 @@ int bch2_btree_node_read_done(struct bch_fs *c, struct bch_dev *ca,
printbuf_exit(&buf);
return retry_read;
fsck_err:
if (ret == BTREE_RETRY_READ) {
if (ret == BTREE_RETRY_READ)
retry_read = 1;
} else {
bch2_inconsistent_error(c);
else
set_btree_node_read_error(b);
}
goto out;
}

5
fs/bcachefs/error.c
View file

@ -27,8 +27,11 @@ bool bch2_inconsistent_error(struct bch_fs *c)
void bch2_topology_error(struct bch_fs *c)
{
if (!test_bit(BCH_FS_TOPOLOGY_REPAIR_DONE, &c->flags))
return;
set_bit(BCH_FS_TOPOLOGY_ERROR, &c->flags);
if (test_bit(BCH_FS_INITIAL_GC_DONE, &c->flags))
if (test_bit(BCH_FS_FSCK_DONE, &c->flags))
bch2_inconsistent_error(c);
}