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mdbx: minor refine copy_asis().

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Change-Id: I5d6240a99cba7e16e39f6466a7e582a068ab746a
This commit is contained in:
Leonid Yuriev 2019-08-22 21:37:56 +03:00
parent 65fd8be9b5
commit 0c63859459
1 changed files with 9 additions and 10 deletions
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19
src/mdbx.c
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@ -11749,21 +11749,20 @@ static int __cold mdbx_env_copy_asis(MDBX_env *env, MDBX_txn *read_txn,
memcpy(buffer, env->me_map, meta_bytes);
MDBX_meta *const headcopy = /* LY: get pointer to the spanshot copy */
(MDBX_meta *)(buffer + ((uint8_t *)mdbx_meta_head(env) - env->me_map));
const uint64_t whole_size =
mdbx_roundup2(pgno2bytes(env, headcopy->mm_geo.now), env->me_os_psize);
mdbx_txn_unlock(env);
/* Update signature to steady */
headcopy->mm_datasync_sign = mdbx_meta_sign(headcopy);
mdbx_txn_unlock(env);
/* Copy the data */
const size_t data_bytes = pgno2bytes(env, read_txn->mt_next_pgno);
const uint64_t whole_size =
mdbx_roundup2(pgno2bytes(env, read_txn->mt_end_pgno), env->me_os_psize);
const size_t used_size = pgno2bytes(env, read_txn->mt_next_pgno);
mdbx_jitter4testing(false);
#if __GLIBC_PREREQ(2, 27) && defined(_GNU_SOURCE)
for (off_t in_offset = meta_bytes; in_offset < (off_t)data_bytes;) {
for (off_t in_offset = meta_bytes; in_offset < (off_t)used_size;) {
off_t out_offset = in_offset;
ssize_t bytes_copied = copy_file_range(
env->me_fd, &in_offset, fd, &out_offset, data_bytes - in_offset, 0);
env->me_fd, &in_offset, fd, &out_offset, used_size - in_offset, 0);
if (unlikely(bytes_copied <= 0)) {
rc = bytes_copied ? errno : MDBX_ENODATA;
break;
@ -11771,9 +11770,9 @@ static int __cold mdbx_env_copy_asis(MDBX_env *env, MDBX_txn *read_txn,
}
#else
uint8_t *data_buffer = buffer + meta_bytes;
for (size_t offset = meta_bytes; offset < data_bytes;) {
for (size_t offset = meta_bytes; offset < used_size;) {
const size_t chunk =
(MDBX_WBUF < data_bytes - offset) ? MDBX_WBUF : data_bytes - offset;
(MDBX_WBUF < used_size - offset) ? MDBX_WBUF : used_size - offset;
memcpy(data_buffer, env->me_map + offset, chunk);
rc = mdbx_pwrite(fd, data_buffer, chunk, offset);
if (unlikely(rc != MDBX_SUCCESS))
@ -11782,7 +11781,7 @@ static int __cold mdbx_env_copy_asis(MDBX_env *env, MDBX_txn *read_txn,
}
#endif
if (likely(rc == MDBX_SUCCESS) && whole_size != data_bytes)
if (likely(rc == MDBX_SUCCESS) && whole_size != used_size)
rc = mdbx_ftruncate(fd, whole_size);
return rc;