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mdbx: engage copy_file_range() for env_copy_as_is.

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Change-Id: I7ea17914d80500ffa70451b80920d726f0e9c2f8
This commit is contained in:
Leonid Yuriev 2019-06-30 16:11:05 +03:00
parent 6960c45e59
commit 40112ebd62
1 changed files with 13 additions and 1 deletions
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14
src/mdbx.c
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@ -11647,6 +11647,17 @@ static int __cold mdbx_env_copy_asis(MDBX_env *env, MDBX_txn *read_txn,
/* Copy the data */
const size_t data_bytes = pgno2bytes(env, read_txn->mt_next_pgno);
#if __GLIBC_PREREQ(2, 27)
for (off_t in_offset = meta_bytes; in_offset < (off_t)data_bytes;) {
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);
if (bytes_copied < 0) {
rc = errno;
break;
}
}
#else
uint8_t *data_buffer = buffer + meta_bytes;
for (size_t offset = meta_bytes;
likely(rc == MDBX_SUCCESS) && offset < data_bytes;) {
@ -11656,8 +11667,9 @@ static int __cold mdbx_env_copy_asis(MDBX_env *env, MDBX_txn *read_txn,
rc = mdbx_pwrite(fd, data_buffer, chunk, offset);
offset += chunk;
}
#endif
if (likely(rc == MDBX_SUCCESS))
if (likely(rc == MDBX_SUCCESS) && whole_size != data_bytes)
rc = mdbx_ftruncate(fd, whole_size);
return rc;