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mdbx: don't resize mapping beyond used part of DB for read-only txn.

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This allow reading extra large DB when used part is acceptable for current platform, i.e. reading DB >4G on a 32-bit platform.
This commit is contained in:
Leonid Yuriev 2020-09-18 15:02:36 +03:00
parent 488a272f8b
commit e762442917
1 changed files with 3 additions and 1 deletions
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4
src/core.c
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@ -6295,7 +6295,9 @@ static int mdbx_txn_renew0(MDBX_txn *txn, const unsigned flags) {
mdbx_warning("%s", "environment had fatal error, must shutdown!"); mdbx_warning("%s", "environment had fatal error, must shutdown!");
rc = MDBX_PANIC; rc = MDBX_PANIC;
} else { } else {
const size_t size = pgno2bytes(env, txn->mt_end_pgno); const size_t size =
pgno2bytes(env, (txn->mt_flags & MDBX_TXN_RDONLY) ? txn->mt_next_pgno
: txn->mt_end_pgno);
if (unlikely(size > env->me_dxb_mmap.limit)) { if (unlikely(size > env->me_dxb_mmap.limit)) {
if (txn->mt_geo.upper > MAX_PAGENO || if (txn->mt_geo.upper > MAX_PAGENO ||
bytes2pgno(env, pgno2bytes(env, txn->mt_geo.upper)) != bytes2pgno(env, pgno2bytes(env, txn->mt_geo.upper)) !=