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/***********************************************************************//**
Tries to extend the last data file of a tablespace if it is auto-extending.
@return FALSE if not auto-extending */
static __attribute__((nonnull))
ibool
fsp_try_extend_data_file(
/*=====================*/
ulint* actual_increase,/*!< out: actual increase in pages, where
we measure the tablespace size from
what the header field says; it may be
the actual file size rounded down to
megabyte */
ulint space, /*!< in: space */
fsp_header_t* header, /*!< in/out: space header */
mtr_t* mtr) /*!< in/out: mini-transaction */
{
ulint size;
ulint zip_size;
ulint new_size;
ulint old_size;
ulint size_increase;
ulint actual_size;
ibool success;
*actual_increase = ;
//UNIV_INTERN ibool srv_auto_extend_last_data_file = FALSE;
&& !srv_auto_extend_last_data_file) {
/* We print the error message only once to avoid
spamming the error log. Note that we don't need
to reset the flag to FALSE as dealing with this
error requires server restart. */
if (fsp_tbs_full_error_printed == FALSE) {
fprintf(stderr,
"InnoDB: Error: Data file(s) ran"
" out of space.\n"
"Please add another data file or"
" use \'autoextend\' for the last"
" data file.\n");
fsp_tbs_full_error_printed = TRUE;
}
return(FALSE);
}
size = mtr_read_ulint(header + FSP_SIZE, MLOG_4BYTES, mtr);
zip_size = dict_table_flags_to_zip_size(
mach_read_from_4(header + FSP_SPACE_FLAGS));
old_size = size;
) {
/**
* if != 0, this tells the max size auto-extending may increase the last data file size
* UNIV_INTERN ulint srv_last_file_size_max = 0;
*
*#define SRV_AUTO_EXTEND_INCREMENT \
(srv_auto_extend_increment * ((1024 * 1024) / UNIV_PAGE_SIZE))
====> 8*((1024*1024)/16k) 为512个page,共计8M (默认为8M)
*/
if (!srv_last_file_size_max) {
size_increase = SRV_AUTO_EXTEND_INCREMENT;
} else {
...
}
} else {
/* We extend single-table tablespaces first one extent
at a time, but for bigger tablespaces more. It is not
enough to extend always by one extent, because some
extents are frag page extents. */
ulint extent_size; /*!< one megabyte, in pages */
if (!zip_size) {
extent_size = FSP_EXTENT_SIZE;
} else {
extent_size = FSP_EXTENT_SIZE
* UNIV_PAGE_SIZE / zip_size;
}
if (size < extent_size) {
/* Let us first extend the file to extent_size */
success = fsp_try_extend_data_file_with_pages(
space, extent_size - , header, mtr);
if (!success) {
new_size = mtr_read_ulint(header + FSP_SIZE,
MLOG_4BYTES, mtr);
*actual_increase = new_size - old_size;
return(FALSE);
}
size = extent_size;
}
* extent_size) {
size_increase = extent_size;
} else {
/* Below in fsp_fill_free_list() we assume
that we add at most FSP_FREE_ADD extents at
a time */
size_increase = FSP_FREE_ADD * extent_size;
}
}
) {
return(TRUE);
}
//当前size+512个page
success = fil_extend_space_to_desired_size(&actual_size, space,size + size_increase);//详见 /* We ignore any fragments of a full megabyte when storing the size
to the space header */
if (!zip_size) {
new_size = ut_calc_align_down(actual_size,
( * ) / UNIV_PAGE_SIZE);
} else {
new_size = ut_calc_align_down(actual_size,
( * ) / zip_size);
}
mlog_write_ulint(header + FSP_SIZE, new_size, MLOG_4BYTES, mtr);
*actual_increase = new_size - old_size;
return(TRUE);
}