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mdbx: fix unexpected EXDEV (Cross-device link) error from mdbx_env_copy()

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Fallback to `write()` if `copy_file_range()` syscall returns `EXDEV`.
This commit is contained in:
Leonid Yuriev 2022-01-14 12:39:38 +03:00
parent c25df39cd0
commit 7a06cac680
2 changed files with 15 additions and 4 deletions
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1
.github/actions/spelling/expect.txt vendored
View File

@ -482,6 +482,7 @@ Exa
exactkey
exactp
excpt
EXDEV
exe
executables
exename

18
src/core.c
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@ -19120,6 +19120,10 @@ __cold static int mdbx_env_copy_asis(MDBX_env *env, MDBX_txn *read_txn,
uint8_t *const data_buffer =
buffer + ceil_powerof2(meta_bytes, env->me_os_psize);
#if MDBX_USE_COPYFILERANGE
static bool copyfilerange_unavailable;
bool not_the_same_filesystem = false;
#endif /* MDBX_USE_COPYFILERANGE */
for (size_t offset = meta_bytes; rc == MDBX_SUCCESS && offset < used_size;) {
#if MDBX_USE_SENDFILE
static bool sendfile_unavailable;
@ -19139,8 +19143,8 @@ __cold static int mdbx_env_copy_asis(MDBX_env *env, MDBX_txn *read_txn,
#endif /* MDBX_USE_SENDFILE */
#if MDBX_USE_COPYFILERANGE
static bool copyfilerange_unavailable;
if (!dest_is_pipe && likely(!copyfilerange_unavailable)) {
if (!dest_is_pipe && !not_the_same_filesystem &&
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);
@ -19149,9 +19153,15 @@ __cold static int mdbx_env_copy_asis(MDBX_env *env, MDBX_txn *read_txn,
continue;
}
rc = MDBX_ENODATA;
if (bytes_copied == 0 || ignore_enosys(rc = errno) != MDBX_RESULT_TRUE)
if (bytes_copied == 0)
break;
rc = errno;
if (rc == EXDEV)
not_the_same_filesystem = true;
else if (ignore_enosys(rc) == MDBX_RESULT_TRUE)
copyfilerange_unavailable = true;
else
break;
copyfilerange_unavailable = true;
}
#endif /* MDBX_USE_COPYFILERANGE */