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mdbx: allow sendfile() and copy_file_range() to fail for Valgrind/QEMU cases.

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Change-Id: I37ee8d652d91a8d2106c782beceaacb13e9f667f
This commit is contained in:
Leonid Yuriev 2020-09-20 20:49:53 +03:00
parent 25e3968199
commit a2e2e5c8a0
2 changed files with 23 additions and 17 deletions
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32
src/core.c
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@ -16315,30 +16315,36 @@ static int __cold mdbx_env_copy_asis(MDBX_env *env, MDBX_txn *read_txn,
buffer + ceil_powerof2(meta_bytes, env->me_os_psize);
for (size_t offset = meta_bytes; rc == MDBX_SUCCESS && offset < used_size;) {
#if MDBX_USE_SENDFILE
if (dest_is_pipe) {
static bool sendfile_unavailable;
if (dest_is_pipe && likely(!sendfile_unavailable)) {
off_t in_offset = offset;
const intptr_t written =
const ssize_t written =
sendfile(fd, env->me_lazy_fd, &in_offset, used_size - offset);
if (unlikely(written <= 0)) {
rc = written ? errno : MDBX_ENODATA;
break;
if (likely(written > 0)) {
offset = in_offset;
continue;
}
offset = in_offset;
continue;
rc = MDBX_ENODATA;
if (written == 0 || ignore_enosys(rc = errno) != MDBX_RESULT_TRUE)
break;
sendfile_unavailable = true;
}
#endif /* MDBX_USE_SENDFILE */
#if MDBX_USE_COPYFILERANGE
if (!dest_is_pipe) {
static bool copyfilerange_unavailable;
if (!dest_is_pipe && likely(!copyfilerange_unavailable)) {
off_t in_offset = offset, out_offset = offset;
ssize_t bytes_copied = copy_file_range(
env->me_lazy_fd, &in_offset, fd, &out_offset, used_size - offset, 0);
if (unlikely(bytes_copied <= 0)) {
rc = bytes_copied ? errno : MDBX_ENODATA;
break;
if (likely(bytes_copied > 0)) {
offset = in_offset;
continue;
}
offset = in_offset;
continue;
rc = MDBX_ENODATA;
if (bytes_copied == 0 || ignore_enosys(rc = errno) != MDBX_RESULT_TRUE)
break;
copyfilerange_unavailable = true;
}
#endif /* MDBX_USE_COPYFILERANGE */

8
src/options.h
View File

@ -164,9 +164,9 @@
/** Advanced: Using sendfile() syscall (autodetection by default). */
#ifndef MDBX_USE_SENDFILE
#if (defined(__linux__) || defined(__gnu_linux__)) && \
(!defined(__ANDROID_API__) || __ANDROID_API__ >= 21) && \
!defined(MDBX_SAFE4QEMU)
#if ((defined(__linux__) || defined(__gnu_linux__)) && \
__GLIBC_PREREQ(2, 3)) || \
(defined(__ANDROID_API__) && __ANDROID_API__ >= 21)
#define MDBX_USE_SENDFILE 1
#else
#define MDBX_USE_SENDFILE 0
@ -175,7 +175,7 @@
/** Advanced: Using copy_file_range() syscall (autodetection by default). */
#ifndef MDBX_USE_COPYFILERANGE
#if __GLIBC_PREREQ(2, 27) && defined(_GNU_SOURCE) && !defined(MDBX_SAFE4QEMU)
#if __GLIBC_PREREQ(2, 27) && defined(_GNU_SOURCE)
#define MDBX_USE_COPYFILERANGE 1
#else
#define MDBX_USE_COPYFILERANGE 0