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Port r529 of branches/5.0: Port r27 of innodb-4.1/trunk: Check the page

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trailers also after writing to disk.
This improves the chances of diagnosing Bug #18886.

os_file_check_page_trailers(): New function for checking that the two
copies of the LSN stamped on the pages match.

os_aio_simulated_handle(): Call os_file_check_page_trailers() before
and after os_file_write().
This commit is contained in:
marko 2006-05-05 12:52:08 +00:00
parent 4299f60dc8
commit 0677a1ec8e
1 changed files with 36 additions and 23 deletions
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59
os/os0file.c
View file

@ -3679,6 +3679,37 @@ os_aio_posix_handle(
}
#endif
/**************************************************************************
Do a 'last millisecond' check that the page end is sensible;
reported page checksum errors from Linux seem to wipe over the page end. */
static
void
os_file_check_page_trailers(
/*========================*/
byte* combined_buf, /* in: combined write buffer */
ulint total_len) /* in: size of combined_buf, in bytes
(a multiple of UNIV_PAGE_SIZE) */
{
ulint len;
for (len = 0; len + UNIV_PAGE_SIZE <= total_len;
len += UNIV_PAGE_SIZE) {
byte* buf = combined_buf + len;
if (memcmp(buf + (FIL_PAGE_LSN + 4), buf + (UNIV_PAGE_SIZE
- FIL_PAGE_END_LSN_OLD_CHKSUM + 4), 4)) {
ut_print_timestamp(stderr);
fprintf(stderr,
" InnoDB: ERROR: The page to be written seems corrupt!\n"
"InnoDB: Writing a block of %lu bytes, currently at offset %lu\n",
(ulong)total_len, (ulong)len);
buf_page_print(buf);
fprintf(stderr,
"InnoDB: ERROR: The page to be written seems corrupt!\n");
}
}
}
/**************************************************************************
Does simulated aio. This function should be called by an i/o-handler
thread. */
@ -3716,7 +3747,6 @@ os_aio_simulated_handle(
ibool ret;
ulint n;
ulint i;
ulint len2;
segment = os_aio_get_array_and_local_segment(&array, global_segment);
@ -3924,32 +3954,15 @@ consecutive_loop:
ut_error;
}
/* Do a 'last millisecond' check that the page end
is sensible; reported page checksum errors from
Linux seem to wipe over the page end */
for (len2 = 0; len2 + UNIV_PAGE_SIZE <= total_len;
len2 += UNIV_PAGE_SIZE) {
if (mach_read_from_4(combined_buf + len2
+ FIL_PAGE_LSN + 4)
!= mach_read_from_4(combined_buf + len2
+ UNIV_PAGE_SIZE
- FIL_PAGE_END_LSN_OLD_CHKSUM + 4)) {
ut_print_timestamp(stderr);
fprintf(stderr,
" InnoDB: ERROR: The page to be written seems corrupt!\n");
fprintf(stderr,
"InnoDB: Writing a block of %lu bytes, currently writing at offset %lu\n",
(ulong)total_len, (ulong)len2);
buf_page_print(combined_buf + len2);
fprintf(stderr,
"InnoDB: ERROR: The page to be written seems corrupt!\n");
}
}
os_file_check_page_trailers(combined_buf, total_len);
}
ret = os_file_write(slot->name, slot->file, combined_buf,
slot->offset, slot->offset_high, total_len);
if (array == os_aio_write_array) {
os_file_check_page_trailers(combined_buf, total_len);
}
} else {
ret = os_file_read(slot->file, combined_buf,
slot->offset, slot->offset_high, total_len);