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mdbx: acquire exclusive lock for the destination file during mdbx_env_copy().

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Change-Id: Ic75796025dd2a649840b96b1f71aecac9360d010
This commit is contained in:
Leonid Yuriev 2020-09-22 16:14:44 +03:00
parent 24c0749eb8
commit 7fe4fccda8
1 changed files with 26 additions and 0 deletions
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26
src/core.c
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@ -16470,6 +16470,32 @@ int __cold mdbx_env_copy(MDBX_env *env, const char *dest_path,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP
#endif
);
if (rc == MDBX_SUCCESS) {
#if defined(_WIN32) || defined(_WIN64)
OVERLAPPED ov;
memset(&ov, 0, sizeof(ov));
if (!LockFileEx(newfd, LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY,
0, 0, INT32_MAX, &ov))
rc = GetLastError();
#else
struct flock lock_op;
memset(&lock_op, 0, sizeof(lock_op));
lock_op.l_type = F_WRLCK;
lock_op.l_whence = SEEK_SET;
lock_op.l_start = 0;
lock_op.l_len =
(sizeof(lock_op.l_len) > 4 ? INT64_MAX : INT32_MAX) & ~(size_t)0xffff;
if (fcntl(newfd, F_SETLK, &lock_op)
#if (defined(__linux__) || defined(__gnu_linux__)) && defined(LOCK_EX) && \
(!defined(__ANDROID_API__) || __ANDROID_API__ >= 24)
|| flock(newfd, LOCK_EX | LOCK_NB)
#endif /* Linux */
)
rc = errno;
#endif /* Windows / POSIX */
}
if (rc == MDBX_SUCCESS)
rc = mdbx_env_copy2fd(env, newfd, flags);