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mdbx: windows - fix truncation race while unmap.

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Change-Id: I93983d100c78aa3e57c5a7ebd9d5bf2a96081ed7
This commit is contained in:
Leo Yuriev 2018-06-15 02:54:41 +03:00
parent b6e605b8da
commit f314cd6b92
2 changed files with 10 additions and 7 deletions
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5
src/mdbx.c
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@ -2041,6 +2041,11 @@ static int mdbx_mapresize(MDBX_env *env, const pgno_t size_pgno,
bailout:
if (rc == MDBX_SUCCESS) {
#if defined(_WIN32) || defined(_WIN64)
assert(size_bytes == env->me_dxb_mmap.current);
assert(size_bytes <= env->me_dxb_mmap.filesize);
assert(limit_bytes == env->me_dxb_mmap.length);
#endif
env->me_dbgeo.now = size_bytes;
env->me_dbgeo.upper = limit_bytes;
if (env->me_txn) {

12
src/osal.c
View File

@ -892,11 +892,6 @@ int mdbx_munmap(mdbx_mmap_t *map) {
if (!NT_SUCCESS(rc))
ntstatus2errcode(rc);
if (map->filesize != map->current &&
mdbx_filesize(map->fd, &map->filesize) == MDBX_SUCCESS &&
map->filesize != map->current)
(void)mdbx_ftruncate(map->fd, map->current);
map->length = 0;
map->current = 0;
map->address = nullptr;
@ -922,8 +917,11 @@ int mdbx_mresize(int flags, mdbx_mmap_t *map, size_t size, size_t limit) {
/* growth rw-section */
SectionSize.QuadPart = size;
status = NtExtendSection(map->section, &SectionSize);
if (NT_SUCCESS(status))
map->filesize = map->current = size;
if (NT_SUCCESS(status)) {
map->current = size;
if (map->filesize < size)
map->filesize = size;
}
return ntstatus2errcode(status);
}