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mdbx: backport - fix concurrent opening with custom pagesize (get pagesize from meta-page early).

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This commit is contained in:
Leo Yuriev 2018-08-23 15:32:20 +03:00 committed by Leonid Yuriev
parent bd672a5583
commit 1b2b98234f
1 changed files with 29 additions and 20 deletions
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49
src/mdbx.c
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@ -4365,6 +4365,8 @@ static int __cold mdbx_read_header(MDBX_env *env, MDBX_meta *meta,
unsigned retryleft = 42;
while (1) {
mdbx_trace("reading meta[%d]: offset %u, bytes %u, retry-left %u",
meta_number, offset, (unsigned)sizeof(page), retryleft);
int err = mdbx_pread(env->me_fd, &page, sizeof(page), offset);
if (err != MDBX_SUCCESS) {
mdbx_error("read meta[%u,%u]: %i, %s", offset, (unsigned)sizeof(page),
@ -4386,9 +4388,12 @@ static int __cold mdbx_read_header(MDBX_env *env, MDBX_meta *meta,
mdbx_info("meta[%u] was updated, re-read it", meta_number);
}
if (!retryleft) {
mdbx_error("meta[%u] is too volatile, skip it", meta_number);
continue;
if (page.mp_meta.mm_magic_and_version != MDBX_DATA_MAGIC) {
mdbx_error("meta[%u] has invalid magic/version %" PRIx64, meta_number,
page.mp_meta.mm_magic_and_version);
return ((page.mp_meta.mm_magic_and_version >> 8) != MDBX_MAGIC)
? MDBX_INVALID
: MDBX_VERSION_MISMATCH;
}
if (page.mp_pgno != meta_number) {
@ -4397,17 +4402,31 @@ static int __cold mdbx_read_header(MDBX_env *env, MDBX_meta *meta,
return MDBX_INVALID;
}
if (!F_ISSET(page.mp_flags, P_META)) {
if (page.mp_flags != P_META) {
mdbx_error("page #%u not a meta-page", meta_number);
return MDBX_INVALID;
}
if (page.mp_meta.mm_magic_and_version != MDBX_DATA_MAGIC) {
mdbx_error("meta[%u] has invalid magic/version %" PRIx64, meta_number,
page.mp_meta.mm_magic_and_version);
return ((page.mp_meta.mm_magic_and_version >> 8) != MDBX_MAGIC)
? MDBX_INVALID
: MDBX_VERSION_MISMATCH;
/* LY: check pagesize */
if (!mdbx_is_power2(page.mp_meta.mm_psize) ||
page.mp_meta.mm_psize < MIN_PAGESIZE ||
page.mp_meta.mm_psize > MAX_PAGESIZE) {
mdbx_notice("meta[%u] has invalid pagesize (%u), skip it", meta_number,
page.mp_meta.mm_psize);
rc = mdbx_is_power2(page.mp_meta.mm_psize) ? MDBX_VERSION_MISMATCH
: MDBX_INVALID;
continue;
}
if (meta_number == 0 && guess_pagesize != page.mp_meta.mm_psize) {
meta->mm_psize = page.mp_meta.mm_psize;
mdbx_info("meta[%u] took pagesize %u", meta_number,
page.mp_meta.mm_psize);
}
if (!retryleft) {
mdbx_error("meta[%u] is too volatile, skip it", meta_number);
continue;
}
if (page.mp_meta.mm_txnid_a != page.mp_meta.mm_txnid_b) {
@ -4425,16 +4444,6 @@ static int __cold mdbx_read_header(MDBX_env *env, MDBX_meta *meta,
continue;
}
/* LY: check pagesize */
if (!mdbx_is_power2(page.mp_meta.mm_psize) ||
page.mp_meta.mm_psize < MIN_PAGESIZE ||
page.mp_meta.mm_psize > MAX_PAGESIZE) {
mdbx_notice("meta[%u] has invalid pagesize (%u), skip it", meta_number,
page.mp_meta.mm_psize);
rc = MDBX_VERSION_MISMATCH;
continue;
}
mdbx_debug("read meta%" PRIaPGNO " = root %" PRIaPGNO "/%" PRIaPGNO
", geo %" PRIaPGNO "/%" PRIaPGNO "-%" PRIaPGNO "/%" PRIaPGNO
" +%u -%u, txn_id %" PRIaTXN ", %s",