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mariadb/page/page0zip.c
marko 42e1de99df branches/zip: Revert r1523. Passing extra parameters to SORT_FUN and CMP_FUN 
of UT_SORT_FUNCTION_BODY is best done by defining SORT_FUN and CMP_FUN as
macros when needed.  The solution of r1523 allows for only one extra parameter.
2007-05-28 07:42:28 +00:00

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/******************************************************
Compressed page interface
(c) 2005 Innobase Oy
Created June 2005 by Marko Makela
*******************************************************/
#define THIS_MODULE
#include "page0zip.h"
#ifdef UNIV_NONINL
# include "page0zip.ic"
#endif
#undef THIS_MODULE
#include "page0page.h"
#include "mtr0log.h"
#include "ut0sort.h"
#include "dict0boot.h"
#include "dict0dict.h"
#include "btr0sea.h"
#include "btr0cur.h"
#include "page0types.h"
#include "lock0lock.h"
#include "log0recv.h"
#include "zlib.h"
/** Number of page compressions, indexed by page_zip_des_t::ssize */
ulint page_zip_compress_count[8];
/** Number of successful page compressions, indexed by page_zip_des_t::ssize */
ulint page_zip_compress_ok[8];
/** Number of page decompressions, indexed by page_zip_des_t::ssize */
ulint page_zip_decompress_count[8];
/* Please refer to ../include/page0zip.ic for a description of the
compressed page format. */
/* The infimum and supremum records are omitted from the compressed page.
On compress, we compare that the records are there, and on uncompress we
restore the records. */
static const byte infimum_extra[] = {
0x01, /* info_bits=0, n_owned=1 */
0x00, 0x02 /* heap_no=0, status=2 */
/* ?, ? */ /* next=(first user rec, or supremum) */
};
static const byte infimum_data[] = {
0x69, 0x6e, 0x66, 0x69,
0x6d, 0x75, 0x6d, 0x00 /* "infimum\0" */
};
static const byte supremum_extra_data[] = {
/* 0x0?, */ /* info_bits=0, n_owned=1..8 */
0x00, 0x0b, /* heap_no=1, status=3 */
0x00, 0x00, /* next=0 */
0x73, 0x75, 0x70, 0x72,
0x65, 0x6d, 0x75, 0x6d /* "supremum" */
};
#ifdef UNIV_DEBUG
/* Array of zeros, used for debug assertions */
static const byte zero[BTR_EXTERN_FIELD_REF_SIZE] = { 0, };
#endif
/**************************************************************************
Determine the guaranteed free space on an empty page. */
ulint
page_zip_empty_size(
/*================*/
/* out: minimum payload size on the page */
ulint n_fields, /* in: number of columns in the index */
ulint zip_size) /* in: compressed page size in bytes */
{
lint size = zip_size
/* subtract the page header and the longest
uncompressed data needed for one record */
- (PAGE_DATA
+ PAGE_ZIP_DIR_SLOT_SIZE
+ DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN
+ 1/* encoded heap_no==2 in page_zip_write_rec() */
+ 1/* end of modification log */
- REC_N_NEW_EXTRA_BYTES/* omitted bytes */)
/* subtract the space for page_zip_fields_encode() */
- compressBound(2 * (n_fields + 1));
return(size > 0 ? (ulint) size : 0);
}
/*****************************************************************
Gets the size of the compressed page trailer (the dense page directory),
including deleted records (the free list). */
UNIV_INLINE
ulint
page_zip_dir_size(
/*==============*/
/* out: length of dense page
directory, in bytes */
const page_zip_des_t* page_zip) /* in: compressed page */
{
/* Exclude the page infimum and supremum from the record count. */
ulint size = PAGE_ZIP_DIR_SLOT_SIZE
* (page_dir_get_n_heap(page_zip->data)
- PAGE_HEAP_NO_USER_LOW);
return(size);
}
/*****************************************************************
Gets the size of the compressed page trailer (the dense page directory),
only including user records (excluding the free list). */
UNIV_INLINE
ulint
page_zip_dir_user_size(
/*===================*/
/* out: length of dense page
directory comprising existing
records, in bytes */
const page_zip_des_t* page_zip) /* in: compressed page */
{
ulint size = PAGE_ZIP_DIR_SLOT_SIZE
* page_get_n_recs(page_zip->data);
ut_ad(size <= page_zip_dir_size(page_zip));
return(size);
}
/*****************************************************************
Find the slot of the given record in the dense page directory. */
UNIV_INLINE
byte*
page_zip_dir_find_low(
/*==================*/
/* out: dense directory slot,
or NULL if record not found */
byte* slot, /* in: start of records */
byte* end, /* in: end of records */
ulint offset) /* in: offset of user record */
{
ut_ad(slot <= end);
for (; slot < end; slot += PAGE_ZIP_DIR_SLOT_SIZE) {
if ((mach_read_from_2(slot) & PAGE_ZIP_DIR_SLOT_MASK)
== offset) {
return(slot);
}
}
return(NULL);
}
/*****************************************************************
Find the slot of the given non-free record in the dense page directory. */
UNIV_INLINE
byte*
page_zip_dir_find(
/*==============*/
/* out: dense directory slot,
or NULL if record not found */
page_zip_des_t* page_zip, /* in: compressed page */
ulint offset) /* in: offset of user record */
{
byte* end = page_zip->data + page_zip_get_size(page_zip);
ut_ad(page_zip_simple_validate(page_zip));
return(page_zip_dir_find_low(end - page_zip_dir_user_size(page_zip),
end,
offset));
}
/*****************************************************************
Find the slot of the given free record in the dense page directory. */
UNIV_INLINE
byte*
page_zip_dir_find_free(
/*===================*/
/* out: dense directory slot,
or NULL if record not found */
page_zip_des_t* page_zip, /* in: compressed page */
ulint offset) /* in: offset of user record */
{
byte* end = page_zip->data + page_zip_get_size(page_zip);
ut_ad(page_zip_simple_validate(page_zip));
return(page_zip_dir_find_low(end - page_zip_dir_size(page_zip),
end - page_zip_dir_user_size(page_zip),
offset));
}
/*****************************************************************
Read a given slot in the dense page directory. */
UNIV_INLINE
ulint
page_zip_dir_get(
/*=============*/
/* out: record offset
on the uncompressed page,
possibly ORed with
PAGE_ZIP_DIR_SLOT_DEL or
PAGE_ZIP_DIR_SLOT_OWNED */
const page_zip_des_t* page_zip, /* in: compressed page */
ulint slot) /* in: slot
(0=first user record) */
{
ut_ad(page_zip_simple_validate(page_zip));
ut_ad(slot < page_zip_dir_size(page_zip) / PAGE_ZIP_DIR_SLOT_SIZE);
return(mach_read_from_2(page_zip->data + page_zip_get_size(page_zip)
- PAGE_ZIP_DIR_SLOT_SIZE * (slot + 1)));
}
/**************************************************************************
Write a log record of compressing an index page. */
static
void
page_zip_compress_write_log(
/*========================*/
const page_zip_des_t* page_zip,/* in: compressed page */
const page_t* page, /* in: uncompressed page */
dict_index_t* index, /* in: index of the B-tree node */
mtr_t* mtr) /* in: mini-transaction */
{
byte* log_ptr;
ulint trailer_size;
log_ptr = mlog_open(mtr, 11 + 2 + 2);
if (!log_ptr) {
return;
}
/* Read the number of user records. */
trailer_size = page_dir_get_n_heap(page_zip->data)
- PAGE_HEAP_NO_USER_LOW;
/* Multiply by uncompressed of size stored per record */
if (!page_is_leaf(page)) {
trailer_size *= PAGE_ZIP_DIR_SLOT_SIZE + REC_NODE_PTR_SIZE;
} else if (dict_index_is_clust(index)) {
trailer_size *= PAGE_ZIP_DIR_SLOT_SIZE
+ DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN;
} else {
trailer_size *= PAGE_ZIP_DIR_SLOT_SIZE;
}
/* Add the space occupied by BLOB pointers. */
trailer_size += page_zip->n_blobs * BTR_EXTERN_FIELD_REF_SIZE;
ut_a(page_zip->m_end > PAGE_DATA);
#if FIL_PAGE_DATA > PAGE_DATA
# error "FIL_PAGE_DATA > PAGE_DATA"
#endif
ut_a(page_zip->m_end + trailer_size <= page_zip_get_size(page_zip));
log_ptr = mlog_write_initial_log_record_fast((page_t*) page,
MLOG_ZIP_PAGE_COMPRESS,
log_ptr, mtr);
mach_write_to_2(log_ptr, page_zip->m_end - FIL_PAGE_TYPE);
log_ptr += 2;
mach_write_to_2(log_ptr, trailer_size);
log_ptr += 2;
mlog_close(mtr, log_ptr);
/* Write FIL_PAGE_PREV and FIL_PAGE_NEXT */
mlog_catenate_string(mtr, page_zip->data + FIL_PAGE_PREV, 4);
mlog_catenate_string(mtr, page_zip->data + FIL_PAGE_NEXT, 4);
/* Write most of the page header, the compressed stream and
the modification log. */
mlog_catenate_string(mtr, page_zip->data + FIL_PAGE_TYPE,
page_zip->m_end - FIL_PAGE_TYPE);
/* Write the uncompressed trailer of the compressed page. */
mlog_catenate_string(mtr, page_zip->data + page_zip_get_size(page_zip)
- trailer_size, trailer_size);
}
/**********************************************************
Determine how many externally stored columns are contained
in existing records with smaller heap_no than rec. */
static
ulint
page_zip_get_n_prev_extern(
/*=======================*/
const page_zip_des_t* page_zip,/* in: dense page directory on
compressed page */
const rec_t* rec, /* in: compact physical record
on a B-tree leaf page */
dict_index_t* index) /* in: record descriptor */
{
const page_t* page = page_align((rec_t*) rec);
ulint n_ext = 0;
ulint i;
ulint left;
ulint heap_no;
ulint n_recs = page_get_n_recs(page_zip->data);
ut_ad(page_is_leaf(page));
ut_ad(page_is_comp(page));
ut_ad(dict_table_is_comp(index->table));
ut_ad(dict_index_is_clust(index));
heap_no = rec_get_heap_no_new(rec);
ut_ad(heap_no >= PAGE_HEAP_NO_USER_LOW);
left = heap_no - PAGE_HEAP_NO_USER_LOW;
if (UNIV_UNLIKELY(!left)) {
return(0);
}
for (i = 0; i < n_recs; i++) {
const rec_t* r = page + (page_zip_dir_get(page_zip, i)
& PAGE_ZIP_DIR_SLOT_MASK);
if (rec_get_heap_no_new(r) < heap_no) {
n_ext += rec_get_n_extern_new(r, index,
ULINT_UNDEFINED);
if (!--left) {
break;
}
}
}
return(n_ext);
}
/**************************************************************************
Encode the length of a fixed-length column. */
static
byte*
page_zip_fixed_field_encode(
/*========================*/
/* out: buf + length of encoded val */
byte* buf, /* in: pointer to buffer where to write */
ulint val) /* in: value to write */
{
ut_ad(val >= 2);
if (UNIV_LIKELY(val < 126)) {
/*
0 = nullable variable field of at most 255 bytes length;
1 = not null variable field of at most 255 bytes length;
126 = nullable variable field with maximum length >255;
127 = not null variable field with maximum length >255
*/
*buf++ = val;
} else {
*buf++ = 0x80 | val >> 8;
*buf++ = 0xff & val;
}
return(buf);
}
/**************************************************************************
Write the index information for the compressed page. */
static
ulint
page_zip_fields_encode(
/*===================*/
/* out: used size of buf */
ulint n, /* in: number of fields to compress */
dict_index_t* index, /* in: index comprising at least n fields */
ulint trx_id_pos,/* in: position of the trx_id column
in the index, or ULINT_UNDEFINED if
this is a non-leaf page */
byte* buf) /* out: buffer of (n + 1) * 2 bytes */
{
const byte* buf_start = buf;
ulint i;
ulint col;
ulint trx_id_col = 0;
/* sum of lengths of preceding non-nullable fixed fields, or 0 */
ulint fixed_sum = 0;
ut_ad(trx_id_pos == ULINT_UNDEFINED || trx_id_pos < n);
for (i = col = 0; i < n; i++) {
dict_field_t* field = dict_index_get_nth_field(index, i);
ulint val;
if (dict_field_get_col(field)->prtype & DATA_NOT_NULL) {
val = 1; /* set the "not nullable" flag */
} else {
val = 0; /* nullable field */
}
if (!field->fixed_len) {
/* variable-length field */
const dict_col_t* column
= dict_field_get_col(field);
if (UNIV_UNLIKELY(column->len > 255)
|| UNIV_UNLIKELY(column->mtype == DATA_BLOB)) {
val |= 0x7e; /* max > 255 bytes */
}
if (fixed_sum) {
/* write out the length of any
preceding non-nullable fields */
buf = page_zip_fixed_field_encode(
buf, fixed_sum << 1 | 1);
fixed_sum = 0;
col++;
}
*buf++ = val;
col++;
} else if (val) {
/* fixed-length non-nullable field */
if (fixed_sum && UNIV_UNLIKELY
(fixed_sum + field->fixed_len
> DICT_MAX_INDEX_COL_LEN)) {
/* Write out the length of the
preceding non-nullable fields,
to avoid exceeding the maximum
length of a fixed-length column. */
buf = page_zip_fixed_field_encode(
buf, fixed_sum << 1 | 1);
fixed_sum = 0;
col++;
}
if (i && UNIV_UNLIKELY(i == trx_id_pos)) {
if (fixed_sum) {
/* Write out the length of any
preceding non-nullable fields,
and start a new trx_id column. */
buf = page_zip_fixed_field_encode(
buf, fixed_sum << 1 | 1);
col++;
}
trx_id_col = col;
fixed_sum = field->fixed_len;
} else {
/* add to the sum */
fixed_sum += field->fixed_len;
}
} else {
/* fixed-length nullable field */
if (fixed_sum) {
/* write out the length of any
preceding non-nullable fields */
buf = page_zip_fixed_field_encode(
buf, fixed_sum << 1 | 1);
fixed_sum = 0;
col++;
}
buf = page_zip_fixed_field_encode(
buf, field->fixed_len << 1);
col++;
}
}
if (fixed_sum) {
/* Write out the lengths of last fixed-length columns. */
buf = page_zip_fixed_field_encode(buf, fixed_sum << 1 | 1);
}
if (trx_id_pos != ULINT_UNDEFINED) {
/* Write out the position of the trx_id column */
i = trx_id_col;
} else {
/* Write out the number of nullable fields */
i = index->n_nullable;
}
if (i < 128) {
*buf++ = i;
} else {
*buf++ = 0x80 | i >> 8;
*buf++ = 0xff & i;
}
ut_ad((ulint) (buf - buf_start) <= (n + 2) * 2);
return((ulint) (buf - buf_start));
}
/**************************************************************************
Populate the dense page directory from the sparse directory. */
static
void
page_zip_dir_encode(
/*================*/
const page_t* page, /* in: compact page */
byte* buf, /* in: pointer to dense page directory[-1];
out: dense directory on compressed page */
const rec_t** recs) /* in: pointer to an array of 0, or NULL;
out: dense page directory sorted by ascending
address (and heap_no) */
{
const byte* rec;
ulint status;
ulint min_mark;
ulint heap_no;
ulint i;
ulint n_heap;
ulint offs;
min_mark = 0;
if (page_is_leaf(page)) {
status = REC_STATUS_ORDINARY;
} else {
status = REC_STATUS_NODE_PTR;
if (UNIV_UNLIKELY
(mach_read_from_4(page + FIL_PAGE_PREV) == FIL_NULL)) {
min_mark = REC_INFO_MIN_REC_FLAG;
}
}
n_heap = page_dir_get_n_heap(page);
/* Traverse the list of stored records in the collation order,
starting from the first user record. */
rec = page + PAGE_NEW_INFIMUM, TRUE;
i = 0;
for (;;) {
ulint info_bits;
offs = rec_get_next_offs(rec, TRUE);
if (UNIV_UNLIKELY(offs == PAGE_NEW_SUPREMUM)) {
break;
}
rec = page + offs;
heap_no = rec_get_heap_no_new(rec);
ut_a(heap_no >= PAGE_HEAP_NO_USER_LOW);
ut_a(heap_no < n_heap);
ut_a(offs < UNIV_PAGE_SIZE - PAGE_DIR);
ut_a(offs >= PAGE_ZIP_START);
#if PAGE_ZIP_DIR_SLOT_MASK & UNIV_PAGE_SIZE
# error "PAGE_ZIP_DIR_SLOT_MASK & UNIV_PAGE_SIZE"
#endif
if (UNIV_UNLIKELY(rec_get_n_owned_new(rec))) {
offs |= PAGE_ZIP_DIR_SLOT_OWNED;
}
info_bits = rec_get_info_bits(rec, TRUE);
if (UNIV_UNLIKELY(info_bits & REC_INFO_DELETED_FLAG)) {
info_bits &= ~REC_INFO_DELETED_FLAG;
offs |= PAGE_ZIP_DIR_SLOT_DEL;
}
ut_a(info_bits == min_mark);
/* Only the smallest user record can have
REC_INFO_MIN_REC_FLAG set. */
min_mark = 0;
mach_write_to_2(buf - PAGE_ZIP_DIR_SLOT_SIZE * ++i, offs);
if (UNIV_LIKELY_NULL(recs)) {
/* Ensure that each heap_no occurs at most once. */
ut_a(!recs[heap_no - PAGE_HEAP_NO_USER_LOW]);
/* exclude infimum and supremum */
recs[heap_no - PAGE_HEAP_NO_USER_LOW] = rec;
}
ut_a(rec_get_status(rec) == status);
}
offs = page_header_get_field(page, PAGE_FREE);
/* Traverse the free list (of deleted records). */
while (offs) {
ut_ad(!(offs & ~PAGE_ZIP_DIR_SLOT_MASK));
rec = page + offs;
heap_no = rec_get_heap_no_new(rec);
ut_a(heap_no >= PAGE_HEAP_NO_USER_LOW);
ut_a(heap_no < n_heap);
ut_a(!rec[-REC_N_NEW_EXTRA_BYTES]); /* info_bits and n_owned */
ut_a(rec_get_status(rec) == status);
mach_write_to_2(buf - PAGE_ZIP_DIR_SLOT_SIZE * ++i, offs);
if (UNIV_LIKELY_NULL(recs)) {
/* Ensure that each heap_no occurs at most once. */
ut_a(!recs[heap_no - PAGE_HEAP_NO_USER_LOW]);
/* exclude infimum and supremum */
recs[heap_no - PAGE_HEAP_NO_USER_LOW] = rec;
}
offs = rec_get_next_offs(rec, TRUE);
}
/* Ensure that each heap no occurs at least once. */
ut_a(i + PAGE_HEAP_NO_USER_LOW == n_heap);
}
/**************************************************************************
Allocate memory for zlib. */
static
void*
page_zip_malloc(
/*============*/
void* opaque,
uInt items,
uInt size)
{
return(mem_heap_alloc(opaque, items * size));
}
/**************************************************************************
Deallocate memory for zlib. */
static
void
page_zip_free(
/*==========*/
void* opaque __attribute__((unused)),
void* address __attribute__((unused)))
{
}
/**************************************************************************
Configure the zlib allocator to use the given memory heap. */
void
page_zip_set_alloc(
/*===============*/
void* stream, /* in/out: zlib stream */
mem_heap_t* heap) /* in: memory heap to use */
{
z_stream* strm = stream;
strm->zalloc = page_zip_malloc;
strm->zfree = page_zip_free;
strm->opaque = heap;
}
#if defined UNIV_DEBUG || defined UNIV_ZIP_DEBUG
/* Set this variable in a debugger to enable
excessive logging in page_zip_compress(). */
ibool page_zip_compress_dbg;
/**************************************************************************
Wrapper for deflate(). Log the operation if page_zip_compress_dbg is set. */
static
ibool
page_zip_compress_deflate(
/*======================*/
z_streamp strm, /* in/out: compressed stream for deflate() */
int flush) /* in: deflate() flushing method */
{
int status;
if (UNIV_UNLIKELY(page_zip_compress_dbg)) {
ut_print_buf(stderr, strm->next_in, strm->avail_in);
}
status = deflate(strm, flush);
if (UNIV_UNLIKELY(page_zip_compress_dbg)) {
fprintf(stderr, " -> %d\n", status);
}
return(status);
}
/* Redefine deflate(). */
# undef deflate
# define deflate page_zip_compress_deflate
#endif /* UNIV_DEBUG || UNIV_ZIP_DEBUG */
/**************************************************************************
Compress the records of a node pointer page. */
static
int
page_zip_compress_node_ptrs(
/*========================*/
/* out: Z_OK, or a zlib error code */
z_stream* c_stream, /* in/out: compressed page stream */
const rec_t** recs, /* in: dense page directory
sorted by address */
ulint n_dense, /* in: size of recs[] */
dict_index_t* index, /* in: the index of the page */
byte* storage, /* in: end of dense page directory */
mem_heap_t* heap) /* in: temporary memory heap */
{
int err = Z_OK;
ulint* offsets = NULL;
do {
const rec_t* rec = *recs++;
offsets = rec_get_offsets(rec, index, offsets,
ULINT_UNDEFINED, &heap);
/* Only leaf nodes may contain externally stored columns. */
ut_ad(!rec_offs_any_extern(offsets));
/* Compress the extra bytes. */
c_stream->avail_in = rec - REC_N_NEW_EXTRA_BYTES
- c_stream->next_in;
if (c_stream->avail_in) {
err = deflate(c_stream, Z_NO_FLUSH);
if (UNIV_UNLIKELY(err != Z_OK)) {
break;
}
}
ut_ad(!c_stream->avail_in);
/* Compress the data bytes, except node_ptr. */
c_stream->next_in = (byte*) rec;
c_stream->avail_in = rec_offs_data_size(offsets)
- REC_NODE_PTR_SIZE;
ut_ad(c_stream->avail_in);
err = deflate(c_stream, Z_NO_FLUSH);
if (UNIV_UNLIKELY(err != Z_OK)) {
break;
}
ut_ad(!c_stream->avail_in);
memcpy(storage - REC_NODE_PTR_SIZE
* (rec_get_heap_no_new(rec) - 1),
c_stream->next_in, REC_NODE_PTR_SIZE);
c_stream->next_in += REC_NODE_PTR_SIZE;
} while (--n_dense);
return(err);
}
/**************************************************************************
Compress the records of a leaf node of a secondary index. */
static
int
page_zip_compress_sec(
/*==================*/
/* out: Z_OK, or a zlib error code */
z_stream* c_stream, /* in/out: compressed page stream */
const rec_t** recs, /* in: dense page directory
sorted by address */
ulint n_dense) /* in: size of recs[] */
{
int err = Z_OK;
ut_ad(n_dense > 0);
do {
const rec_t* rec = *recs++;
/* Compress everything up to this record. */
c_stream->avail_in = rec - REC_N_NEW_EXTRA_BYTES
- c_stream->next_in;
if (UNIV_LIKELY(c_stream->avail_in)) {
err = deflate(c_stream, Z_NO_FLUSH);
if (UNIV_UNLIKELY(err != Z_OK)) {
break;
}
}
ut_ad(!c_stream->avail_in);
ut_ad(c_stream->next_in == rec - REC_N_NEW_EXTRA_BYTES);
/* Skip the REC_N_NEW_EXTRA_BYTES. */
c_stream->next_in = (byte*) rec;
} while (--n_dense);
return(err);
}
/**************************************************************************
Compress a record of a leaf node of a clustered index that contains
externally stored columns. */
static
int
page_zip_compress_clust_ext(
/*========================*/
/* out: Z_OK, or a zlib error code */
z_stream* c_stream, /* in/out: compressed page stream */
const rec_t* rec, /* in: record */
const ulint* offsets, /* in: rec_get_offsets(rec) */
ulint trx_id_col, /* in: position of of DB_TRX_ID */
byte* deleted, /* in: dense directory entry pointing
to the head of the free list */
byte* storage, /* in: end of dense page directory */
byte** externs, /* in/out: pointer to the next
available BLOB pointer */
ulint* n_blobs) /* in/out: number of
externally stored columns */
{
int err;
ulint i;
for (i = 0; i < rec_offs_n_fields(offsets); i++) {
ulint len;
const byte* src;
if (UNIV_UNLIKELY(i == trx_id_col)) {
ut_ad(!rec_offs_nth_extern(offsets, i));
/* Store trx_id and roll_ptr
in uncompressed form. */
src = rec_get_nth_field(rec, offsets, i, &len);
ut_ad(src + DATA_TRX_ID_LEN
== rec_get_nth_field(rec, offsets,
i + 1, &len));
ut_ad(len == DATA_ROLL_PTR_LEN);
/* Compress any preceding bytes. */
c_stream->avail_in
= src - c_stream->next_in;
if (c_stream->avail_in) {
err = deflate(c_stream, Z_NO_FLUSH);
if (UNIV_UNLIKELY(err != Z_OK)) {
return(err);
}
}
ut_ad(!c_stream->avail_in);
ut_ad(c_stream->next_in == src);
memcpy(storage
- (DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN)
* (rec_get_heap_no_new(rec) - 1),
c_stream->next_in,
DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN);
c_stream->next_in
+= DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN;
/* Skip also roll_ptr */
i++;
} else if (rec_offs_nth_extern(offsets, i)) {
src = rec_get_nth_field(rec, offsets, i, &len);
ut_ad(len >= BTR_EXTERN_FIELD_REF_SIZE);
src += len - BTR_EXTERN_FIELD_REF_SIZE;
c_stream->avail_in = src
- c_stream->next_in;
if (UNIV_LIKELY(c_stream->avail_in)) {
err = deflate(c_stream, Z_NO_FLUSH);
if (UNIV_UNLIKELY(err != Z_OK)) {
return(err);
}
}
ut_ad(!c_stream->avail_in);
ut_ad(c_stream->next_in == src);
/* Reserve space for the data at
the end of the space reserved for
the compressed data and the page
modification log. */
if (UNIV_UNLIKELY
(c_stream->avail_out
<= BTR_EXTERN_FIELD_REF_SIZE)) {
/* out of space */
return(Z_BUF_ERROR);
}
ut_ad(*externs == c_stream->next_out
+ c_stream->avail_out
+ 1/* end of modif. log */);
c_stream->next_in
+= BTR_EXTERN_FIELD_REF_SIZE;
/* Skip deleted records. */
if (UNIV_LIKELY_NULL
(page_zip_dir_find_low(
storage, deleted,
page_offset(rec)))) {
continue;
}
(*n_blobs)++;
c_stream->avail_out
-= BTR_EXTERN_FIELD_REF_SIZE;
*externs -= BTR_EXTERN_FIELD_REF_SIZE;
/* Copy the BLOB pointer */
memcpy(*externs, c_stream->next_in
- BTR_EXTERN_FIELD_REF_SIZE,
BTR_EXTERN_FIELD_REF_SIZE);
}
}
return(Z_OK);
}
/**************************************************************************
Compress the records of a leaf node of a clustered index. */
static
int
page_zip_compress_clust(
/*====================*/
/* out: Z_OK, or a zlib error code */
z_stream* c_stream, /* in/out: compressed page stream */
const rec_t** recs, /* in: dense page directory
sorted by address */
ulint n_dense, /* in: size of recs[] */
dict_index_t* index, /* in: the index of the page */
ulint* n_blobs, /* in: 0; out: number of
externally stored columns */
ulint trx_id_col, /* index of the trx_id column */
byte* deleted, /* in: dense directory entry pointing
to the head of the free list */
byte* storage, /* in: end of dense page directory */
mem_heap_t* heap) /* in: temporary memory heap */
{
int err = Z_OK;
ulint* offsets = NULL;
/* BTR_EXTERN_FIELD_REF storage */
byte* externs = storage - n_dense
* (DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN);
ut_ad(*n_blobs == 0);
do {
const rec_t* rec = *recs++;
offsets = rec_get_offsets(rec, index, offsets,
ULINT_UNDEFINED, &heap);
ut_ad(rec_offs_n_fields(offsets)
== dict_index_get_n_fields(index));
/* Compress the extra bytes. */
c_stream->avail_in = rec - REC_N_NEW_EXTRA_BYTES
- c_stream->next_in;
if (c_stream->avail_in) {
err = deflate(c_stream, Z_NO_FLUSH);
if (UNIV_UNLIKELY(err != Z_OK)) {
goto func_exit;
}
}
ut_ad(!c_stream->avail_in);
ut_ad(c_stream->next_in == rec - REC_N_NEW_EXTRA_BYTES);
/* Compress the data bytes. */
c_stream->next_in = (byte*) rec;
/* Check if there are any externally stored columns.
For each externally stored column, store the
BTR_EXTERN_FIELD_REF separately. */
if (UNIV_UNLIKELY(rec_offs_any_extern(offsets))) {
ut_ad(dict_index_is_clust(index));
err = page_zip_compress_clust_ext(
c_stream, rec, offsets, trx_id_col,
deleted, storage, &externs, n_blobs);
if (UNIV_UNLIKELY(err != Z_OK)) {
goto func_exit;
}
} else {
ulint len;
const byte* src;
/* Store trx_id and roll_ptr in uncompressed form. */
src = rec_get_nth_field(rec, offsets,
trx_id_col, &len);
ut_ad(src + DATA_TRX_ID_LEN
== rec_get_nth_field(rec, offsets,
trx_id_col + 1, &len));
ut_ad(len == DATA_ROLL_PTR_LEN);
/* Compress any preceding bytes. */
c_stream->avail_in = src - c_stream->next_in;
if (c_stream->avail_in) {
err = deflate(c_stream, Z_NO_FLUSH);
if (UNIV_UNLIKELY(err != Z_OK)) {
return(err);
}
}
ut_ad(!c_stream->avail_in);
ut_ad(c_stream->next_in == src);
memcpy(storage
- (DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN)
* (rec_get_heap_no_new(rec) - 1),
c_stream->next_in,
DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN);
c_stream->next_in
+= DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN;
/* Skip also roll_ptr */
ut_ad(trx_id_col + 1 < rec_offs_n_fields(offsets));
}
/* Compress the last bytes of the record. */
c_stream->avail_in = rec + rec_offs_data_size(offsets)
- c_stream->next_in;
if (c_stream->avail_in) {
err = deflate(c_stream, Z_NO_FLUSH);
if (UNIV_UNLIKELY(err != Z_OK)) {
goto func_exit;
}
}
ut_ad(!c_stream->avail_in);
} while (--n_dense);
func_exit:
return(err);
}
/**************************************************************************
Compress a page. */
ibool
page_zip_compress(
/*==============*/
/* out: TRUE on success, FALSE on failure;
page_zip will be left intact on failure. */
page_zip_des_t* page_zip,/* in: size; out: data, n_blobs,
m_start, m_end, m_nonempty */
const page_t* page, /* in: uncompressed page */
dict_index_t* index, /* in: index of the B-tree node */
mtr_t* mtr) /* in: mini-transaction, or NULL */
{
z_stream c_stream;
int err;
ulint n_fields;/* number of index fields needed */
byte* fields; /* index field information */
byte* buf; /* compressed payload of the page */
byte* buf_end;/* end of buf */
ulint n_dense;
ulint slot_size;/* amount of uncompressed bytes per record */
const rec_t** recs; /* dense page directory, sorted by address */
mem_heap_t* heap;
ulint trx_id_col;
ulint* offsets = NULL;
ulint n_blobs = 0;
byte* storage;/* storage of uncompressed columns */
ut_a(page_is_comp(page));
ut_a(fil_page_get_type(page) == FIL_PAGE_INDEX);
ut_ad(page_simple_validate_new((page_t*) page));
ut_ad(page_zip_simple_validate(page_zip));
/* Check the data that will be omitted. */
ut_a(!memcmp(page + (PAGE_NEW_INFIMUM - REC_N_NEW_EXTRA_BYTES),
infimum_extra, sizeof infimum_extra));
ut_a(!memcmp(page + PAGE_NEW_INFIMUM,
infimum_data, sizeof infimum_data));
ut_a(page[PAGE_NEW_SUPREMUM - REC_N_NEW_EXTRA_BYTES]
/* info_bits == 0, n_owned <= max */
<= PAGE_DIR_SLOT_MAX_N_OWNED);
ut_a(!memcmp(page + (PAGE_NEW_SUPREMUM - REC_N_NEW_EXTRA_BYTES + 1),
supremum_extra_data, sizeof supremum_extra_data));
if (UNIV_UNLIKELY(!page_get_n_recs(page))) {
ut_a(rec_get_next_offs(page + PAGE_NEW_INFIMUM, TRUE)
== PAGE_NEW_SUPREMUM);
}
if (page_is_leaf(page)) {
n_fields = dict_index_get_n_fields(index);
} else {
n_fields = dict_index_get_n_unique_in_tree(index);
}
/* The dense directory excludes the infimum and supremum records. */
n_dense = page_dir_get_n_heap(page) - PAGE_HEAP_NO_USER_LOW;
#if defined UNIV_DEBUG || defined UNIV_ZIP_DEBUG
if (UNIV_UNLIKELY(page_zip_compress_dbg)) {
fprintf(stderr, "compress %p %p %lu %lu %lu\n",
(void*) page_zip, (void*) page,
page_is_leaf(page),
n_fields, n_dense);
}
#endif /* UNIV_DEBUG || UNIV_ZIP_DEBUG */
page_zip_compress_count[page_zip->ssize]++;
if (UNIV_UNLIKELY(n_dense * PAGE_ZIP_DIR_SLOT_SIZE
>= page_zip_get_size(page_zip))) {
return(FALSE);
}
heap = mem_heap_create(page_zip_get_size(page_zip)
+ n_fields * (2 + sizeof *offsets)
+ n_dense * ((sizeof *recs)
- PAGE_ZIP_DIR_SLOT_SIZE)
+ UNIV_PAGE_SIZE * 4
+ (512 << MAX_MEM_LEVEL));
recs = mem_heap_alloc(heap, n_dense * sizeof *recs);
memset(recs, 0, n_dense * sizeof *recs);
fields = mem_heap_alloc(heap, (n_fields + 1) * 2);
buf = mem_heap_alloc(heap, page_zip_get_size(page_zip) - PAGE_DATA);
buf_end = buf + page_zip_get_size(page_zip) - PAGE_DATA;
/* Compress the data payload. */
page_zip_set_alloc(&c_stream, heap);
err = deflateInit2(&c_stream, Z_DEFAULT_COMPRESSION,
Z_DEFLATED, UNIV_PAGE_SIZE_SHIFT,
MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY);
ut_a(err == Z_OK);
c_stream.next_out = buf;
/* Subtract the space reserved for uncompressed data. */
/* Page header and the end marker of the modification log */
c_stream.avail_out = buf_end - buf - 1;
/* Dense page directory and uncompressed columns, if any */
if (page_is_leaf(page)) {
if (dict_index_is_clust(index)) {
trx_id_col = dict_index_get_sys_col_pos(
index, DATA_TRX_ID);
ut_ad(trx_id_col > 0);
ut_ad(trx_id_col != ULINT_UNDEFINED);
slot_size = PAGE_ZIP_DIR_SLOT_SIZE
+ DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN;
} else {
/* Signal the absence of trx_id
in page_zip_fields_encode() */
ut_ad(dict_index_get_sys_col_pos(index, DATA_TRX_ID)
== ULINT_UNDEFINED);
trx_id_col = 0;
slot_size = PAGE_ZIP_DIR_SLOT_SIZE;
}
} else {
slot_size = PAGE_ZIP_DIR_SLOT_SIZE + REC_NODE_PTR_SIZE;
trx_id_col = ULINT_UNDEFINED;
}
if (UNIV_UNLIKELY(c_stream.avail_out < n_dense * slot_size)) {
goto zlib_error;
}
c_stream.avail_out -= n_dense * slot_size;
c_stream.avail_in = page_zip_fields_encode(n_fields, index,
trx_id_col, fields);
c_stream.next_in = fields;
if (UNIV_LIKELY(!trx_id_col)) {
trx_id_col = ULINT_UNDEFINED;
}
err = deflate(&c_stream, Z_FULL_FLUSH);
if (err != Z_OK) {
goto zlib_error;
}
ut_ad(!c_stream.avail_in);
page_zip_dir_encode(page, buf_end, recs);
c_stream.next_in = (byte*) page + PAGE_ZIP_START;
storage = buf_end - n_dense * PAGE_ZIP_DIR_SLOT_SIZE;
/* Compress the records in heap_no order. */
if (UNIV_UNLIKELY(!n_dense)) {
} else if (!page_is_leaf(page)) {
/* This is a node pointer page. */
err = page_zip_compress_node_ptrs(&c_stream, recs, n_dense,
index, storage, heap);
if (UNIV_UNLIKELY(err != Z_OK)) {
goto zlib_error;
}
} else if (UNIV_LIKELY(trx_id_col == ULINT_UNDEFINED)) {
/* This is a leaf page in a secondary index. */
err = page_zip_compress_sec(&c_stream, recs, n_dense);
if (UNIV_UNLIKELY(err != Z_OK)) {
goto zlib_error;
}
} else {
/* This is a leaf page in a clustered index. */
err = page_zip_compress_clust(&c_stream, recs, n_dense,
index, &n_blobs, trx_id_col,
buf_end - PAGE_ZIP_DIR_SLOT_SIZE
* page_get_n_recs(page),
storage, heap);
if (UNIV_UNLIKELY(err != Z_OK)) {
goto zlib_error;
}
}
/* Finish the compression. */
ut_ad(!c_stream.avail_in);
/* Compress any trailing garbage, in case the last record was
allocated from an originally longer space on the free list,
or the data of the last record from page_zip_compress_sec(). */
c_stream.avail_in
= page_header_get_field(page, PAGE_HEAP_TOP)
- (c_stream.next_in - page);
ut_a(c_stream.avail_in <= UNIV_PAGE_SIZE - PAGE_ZIP_START - PAGE_DIR);
err = deflate(&c_stream, Z_FINISH);
if (UNIV_UNLIKELY(err != Z_STREAM_END)) {
zlib_error:
deflateEnd(&c_stream);
mem_heap_free(heap);
return(FALSE);
}
err = deflateEnd(&c_stream);
ut_a(err == Z_OK);
ut_ad(buf + c_stream.total_out == c_stream.next_out);
ut_ad((ulint) (storage - c_stream.next_out) >= c_stream.avail_out);
/* Zero out the area reserved for the modification log.
Space for the end marker of the modification log is not
included in avail_out. */
memset(c_stream.next_out, 0, c_stream.avail_out + 1/* end marker */);
#ifdef UNIV_DEBUG
page_zip->m_start =
#endif /* UNIV_DEBUG */
page_zip->m_end = PAGE_DATA + c_stream.total_out;
page_zip->m_nonempty = FALSE;
page_zip->n_blobs = n_blobs;
/* Copy those header fields that will not be written
in buf_flush_init_for_writing() */
memcpy(page_zip->data + FIL_PAGE_PREV, page + FIL_PAGE_PREV,
FIL_PAGE_LSN - FIL_PAGE_PREV);
memcpy(page_zip->data + FIL_PAGE_TYPE, page + FIL_PAGE_TYPE, 2);
memcpy(page_zip->data + FIL_PAGE_DATA, page + FIL_PAGE_DATA,
PAGE_DATA - FIL_PAGE_DATA);
/* Copy the rest of the compressed page */
memcpy(page_zip->data + PAGE_DATA, buf,
page_zip_get_size(page_zip) - PAGE_DATA);
mem_heap_free(heap);
#ifdef UNIV_ZIP_DEBUG
ut_a(page_zip_validate(page_zip, page));
#endif /* UNIV_ZIP_DEBUG */
if (mtr) {
page_zip_compress_write_log(page_zip, page, index, mtr);
}
page_zip_compress_ok[page_zip->ssize]++;
return(TRUE);
}
/**************************************************************************
Compare two page directory entries. */
UNIV_INLINE
ibool
page_zip_dir_cmp(
/*=============*/
/* out: positive if rec1 > rec2 */
const rec_t* rec1, /* in: rec1 */
const rec_t* rec2) /* in: rec2 */
{
return(rec1 > rec2);
}
/**************************************************************************
Sort the dense page directory by address (heap_no). */
static
void
page_zip_dir_sort(
/*==============*/
rec_t** arr, /* in/out: dense page directory */
rec_t** aux_arr,/* in/out: work area */
ulint low, /* in: lower bound of the sorting area, inclusive */
ulint high) /* in: upper bound of the sorting area, exclusive */
{
UT_SORT_FUNCTION_BODY(page_zip_dir_sort, arr, aux_arr, low, high,
page_zip_dir_cmp);
}
/**************************************************************************
Deallocate the index information initialized by page_zip_fields_decode(). */
static
void
page_zip_fields_free(
/*=================*/
dict_index_t* index) /* in: dummy index to be freed */
{
if (index) {
dict_table_t* table = index->table;
mem_heap_free(index->heap);
mutex_free(&(table->autoinc_mutex));
mem_heap_free(table->heap);
}
}
/**************************************************************************
Read the index information for the compressed page. */
static
dict_index_t*
page_zip_fields_decode(
/*===================*/
/* out,own: dummy index describing the page,
or NULL on error */
const byte* buf, /* in: index information */
const byte* end, /* in: end of buf */
ulint* trx_id_col)/* in: NULL for non-leaf pages;
for leaf pages, pointer to where to store
the position of the trx_id column */
{
const byte* b;
ulint n;
ulint i;
ulint val;
dict_table_t* table;
dict_index_t* index;
/* Determine the number of fields. */
for (b = buf, n = 0; b < end; n++) {
if (*b++ & 0x80) {
b++; /* skip the second byte */
}
}
n--; /* n_nullable or trx_id */
if (UNIV_UNLIKELY(n > REC_MAX_N_FIELDS)
|| UNIV_UNLIKELY(b > end)) {
return(NULL);
}
table = dict_mem_table_create("ZIP_DUMMY", DICT_HDR_SPACE, n,
DICT_TF_COMPACT);
index = dict_mem_index_create("ZIP_DUMMY", "ZIP_DUMMY",
DICT_HDR_SPACE, 0, n);
index->table = table;
index->n_uniq = n;
/* avoid ut_ad(index->cached) in dict_index_get_n_unique_in_tree */
index->cached = TRUE;
/* Initialize the fields. */
for (b = buf, i = 0; i < n; i++) {
ulint mtype;
ulint len;
val = *b++;
if (UNIV_UNLIKELY(val & 0x80)) {
/* fixed length > 62 bytes */
val = (val & 0x7f) << 8 | *b++;
len = val >> 1;
mtype = DATA_FIXBINARY;
} else if (UNIV_UNLIKELY(val >= 126)) {
/* variable length with max > 255 bytes */
len = 0x7fff;
mtype = DATA_BINARY;
} else if (val <= 1) {
/* variable length with max <= 255 bytes */
len = 0;
mtype = DATA_BINARY;
} else {
/* fixed length < 62 bytes */
len = val >> 1;
mtype = DATA_FIXBINARY;
}
dict_mem_table_add_col(table, NULL, NULL, mtype,
val & 1 ? DATA_NOT_NULL : 0, len);
dict_index_add_col(index, table,
dict_table_get_nth_col(table, i), 0);
}
val = *b++;
if (UNIV_UNLIKELY(val & 0x80)) {
val = (val & 0x7f) << 8 | *b++;
}
/* Decode the position of the trx_id column. */
if (trx_id_col) {
if (!val) {
val = ULINT_UNDEFINED;
} else if (UNIV_UNLIKELY(val >= n)) {
page_zip_fields_free(index);
index = NULL;
} else {
index->type = DICT_CLUSTERED;
}
*trx_id_col = val;
} else {
/* Decode the number of nullable fields. */
if (UNIV_UNLIKELY(index->n_nullable > val)) {
page_zip_fields_free(index);
index = NULL;
} else {
index->n_nullable = val;
}
}
ut_ad(b == end);
return(index);
}
/**************************************************************************
Populate the sparse page directory from the dense directory. */
static
ibool
page_zip_dir_decode(
/*================*/
/* out: TRUE on success,
FALSE on failure */
const page_zip_des_t* page_zip,/* in: dense page directory on
compressed page */
page_t* page, /* in: compact page with valid header;
out: trailer and sparse page directory
filled in */
rec_t** recs, /* out: dense page directory sorted by
ascending address (and heap_no) */
rec_t** recs_aux,/* in/out: scratch area */
ulint n_dense)/* in: number of user records, and
size of recs[] and recs_aux[] */
{
ulint i;
ulint n_recs;
byte* slot;
n_recs = page_get_n_recs(page);
if (UNIV_UNLIKELY(n_recs > n_dense)) {
return(FALSE);
}
/* Traverse the list of stored records in the sorting order,
starting from the first user record. */
slot = page + (UNIV_PAGE_SIZE - PAGE_DIR - PAGE_DIR_SLOT_SIZE);
UNIV_PREFETCH_RW(slot);
/* Zero out the page trailer. */
memset(slot + PAGE_DIR_SLOT_SIZE, 0, PAGE_DIR);
mach_write_to_2(slot, PAGE_NEW_INFIMUM);
slot -= PAGE_DIR_SLOT_SIZE;
UNIV_PREFETCH_RW(slot);
/* Initialize the sparse directory and copy the dense directory. */
for (i = 0; i < n_recs; i++) {
ulint offs = page_zip_dir_get(page_zip, i);
if (offs & PAGE_ZIP_DIR_SLOT_OWNED) {
mach_write_to_2(slot, offs & PAGE_ZIP_DIR_SLOT_MASK);
slot -= PAGE_DIR_SLOT_SIZE;
UNIV_PREFETCH_RW(slot);
}
if (UNIV_UNLIKELY((offs & PAGE_ZIP_DIR_SLOT_MASK)
< PAGE_ZIP_START + REC_N_NEW_EXTRA_BYTES)) {
return(FALSE);
}
recs[i] = page + (offs & PAGE_ZIP_DIR_SLOT_MASK);
}
mach_write_to_2(slot, PAGE_NEW_SUPREMUM);
if (UNIV_UNLIKELY
(slot != page_dir_get_nth_slot(page,
page_dir_get_n_slots(page) - 1))) {
return(FALSE);
}
/* Copy the rest of the dense directory. */
for (; i < n_dense; i++) {
ulint offs = page_zip_dir_get(page_zip, i);
if (UNIV_UNLIKELY(offs & ~PAGE_ZIP_DIR_SLOT_MASK)) {
return(FALSE);
}
recs[i] = page + offs;
}
if (UNIV_LIKELY(n_dense > 1)) {
page_zip_dir_sort(recs, recs_aux, 0, n_dense);
}
return(TRUE);
}
/**************************************************************************
Initialize the REC_N_NEW_EXTRA_BYTES of each record. */
static
ibool
page_zip_set_extra_bytes(
/*=====================*/
/* out: TRUE on success,
FALSE on failure */
const page_zip_des_t* page_zip,/* in: compressed page */
page_t* page, /* in/out: uncompressed page */
ulint info_bits)/* in: REC_INFO_MIN_REC_FLAG or 0 */
{
ulint n;
ulint i;
ulint n_owned = 1;
ulint offs;
rec_t* rec;
n = page_get_n_recs(page);
rec = page + PAGE_NEW_INFIMUM;
for (i = 0; i < n; i++) {
offs = page_zip_dir_get(page_zip, i);
if (UNIV_UNLIKELY(offs & PAGE_ZIP_DIR_SLOT_DEL)) {
info_bits |= REC_INFO_DELETED_FLAG;
}
if (UNIV_UNLIKELY(offs & PAGE_ZIP_DIR_SLOT_OWNED)) {
info_bits |= n_owned;
n_owned = 1;
} else {
n_owned++;
}
offs &= PAGE_ZIP_DIR_SLOT_MASK;
if (UNIV_UNLIKELY(offs < PAGE_ZIP_START
+ REC_N_NEW_EXTRA_BYTES)) {
return(FALSE);
}
rec_set_next_offs_new(rec, offs);
rec = page + offs;
rec[-REC_N_NEW_EXTRA_BYTES] = info_bits;
info_bits = 0;
}
/* Set the next pointer of the last user record. */
rec_set_next_offs_new(rec, PAGE_NEW_SUPREMUM);
/* Set n_owned of the supremum record. */
page[PAGE_NEW_SUPREMUM - REC_N_NEW_EXTRA_BYTES] = n_owned;
/* The dense directory excludes the infimum and supremum records. */
n = page_dir_get_n_heap(page) - PAGE_HEAP_NO_USER_LOW;
if (i >= n) {
return(UNIV_LIKELY(i == n));
}
offs = page_zip_dir_get(page_zip, i);
/* Set the extra bytes of deleted records on the free list. */
for (;;) {
if (UNIV_UNLIKELY(!offs)
|| UNIV_UNLIKELY(offs & ~PAGE_ZIP_DIR_SLOT_MASK)) {
return(FALSE);
}
rec = page + offs;
rec[-REC_N_NEW_EXTRA_BYTES] = 0; /* info_bits and n_owned */
if (++i == n) {
break;
}
offs = page_zip_dir_get(page_zip, i);
rec_set_next_offs_new(rec, offs);
}
/* Terminate the free list. */
rec[-REC_N_NEW_EXTRA_BYTES] = 0; /* info_bits and n_owned */
rec_set_next_offs_new(rec, 0);
return(TRUE);
}
/**************************************************************************
Apply the modification log to a record containing externally stored
columns. Do not copy the fields that are stored separately. */
static
const byte*
page_zip_apply_log_ext(
/*===================*/
/* out: pointer to modification log,
or NULL on failure */
rec_t* rec, /* in/out: record */
const ulint* offsets, /* in: rec_get_offsets(rec) */
ulint trx_id_col, /* in: position of of DB_TRX_ID */
const byte* data, /* in: modification log */
const byte* end) /* in: end of modification log */
{
ulint i;
ulint len;
byte* next_out = rec;
/* Check if there are any externally stored columns.
For each externally stored column, skip the
BTR_EXTERN_FIELD_REF. */
for (i = 0; i < rec_offs_n_fields(offsets); i++) {
byte* dst;
if (UNIV_UNLIKELY(i == trx_id_col)) {
/* Skip trx_id and roll_ptr */
dst = rec_get_nth_field(rec, offsets,
i, &len);
if (UNIV_UNLIKELY(dst - next_out
>= end - data)
|| UNIV_UNLIKELY
(len < (DATA_TRX_ID_LEN
+ DATA_ROLL_PTR_LEN))
|| rec_offs_nth_extern(offsets,
i)) {
return(NULL);
}
memcpy(next_out, data, dst - next_out);
data += dst - next_out;
next_out = dst + (DATA_TRX_ID_LEN
+ DATA_ROLL_PTR_LEN);
} else if (rec_offs_nth_extern(offsets, i)) {
dst = rec_get_nth_field(rec, offsets,
i, &len);
ut_ad(len
>= BTR_EXTERN_FIELD_REF_SIZE);
len += dst - next_out
- BTR_EXTERN_FIELD_REF_SIZE;
if (UNIV_UNLIKELY(data + len >= end)) {
return(NULL);
}
memcpy(next_out, data, len);
data += len;
next_out += len
+ BTR_EXTERN_FIELD_REF_SIZE;
}
}
/* Copy the last bytes of the record. */
len = rec_get_end(rec, offsets) - next_out;
if (UNIV_UNLIKELY(data + len >= end)) {
return(NULL);
}
memcpy(next_out, data, len);
data += len;
return(data);
}
/**************************************************************************
Apply the modification log to an uncompressed page.
Do not copy the fields that are stored separately. */
static
const byte*
page_zip_apply_log(
/*===============*/
/* out: pointer to end of modification log,
or NULL on failure */
const byte* data, /* in: modification log */
ulint size, /* in: maximum length of the log, in bytes */
rec_t** recs, /* in: dense page directory,
sorted by address (indexed by
heap_no - PAGE_HEAP_NO_USER_LOW) */
ulint n_dense,/* in: size of recs[] */
ulint trx_id_col,/* in: column number of trx_id in the index,
or ULINT_UNDEFINED if none */
ulint heap_status,
/* in: heap_no and status bits for
the next record to uncompress */
dict_index_t* index, /* in: index of the page */
ulint* offsets)/* in/out: work area for
rec_get_offsets_reverse() */
{
const byte* const end = data + size;
for (;;) {
ulint val;
rec_t* rec;
ulint len;
ulint hs;
val = *data++;
if (UNIV_UNLIKELY(!val)) {
return(data - 1);
}
if (val & 0x80) {
val = (val & 0x7f) << 8 | *data++;
if (UNIV_UNLIKELY(!val)) {
return(NULL);
}
}
if (UNIV_UNLIKELY(data >= end)) {
return(NULL);
}
if (UNIV_UNLIKELY((val >> 1) > n_dense)) {
return(NULL);
}
/* Determine the heap number and status bits of the record. */
rec = recs[(val >> 1) - 1];
if (val & 1) {
/* Clear the data bytes of the record. */
mem_heap_t* heap = NULL;
ulint* offs;
offs = rec_get_offsets(rec, index, offsets,
ULINT_UNDEFINED, &heap);
memset(rec, 0, rec_offs_data_size(offs));
if (UNIV_LIKELY_NULL(heap)) {
mem_heap_free(heap);
}
continue;
}
hs = ((val >> 1) + 1) << REC_HEAP_NO_SHIFT;
hs |= heap_status & ((1 << REC_HEAP_NO_SHIFT) - 1);
/* This may either be an old record that is being
overwritten (updated in place, or allocated from
the free list), or a new record, with the next
available_heap_no. */
if (UNIV_UNLIKELY(hs > heap_status)) {
return(NULL);
} else if (hs == heap_status) {
/* A new record was allocated from the heap. */
heap_status += 1 << REC_HEAP_NO_SHIFT;
}
mach_write_to_2(rec - REC_NEW_HEAP_NO, hs);
#if REC_STATUS_NODE_PTR != TRUE
# error "REC_STATUS_NODE_PTR != TRUE"
#endif
rec_get_offsets_reverse(data, index,
hs & REC_STATUS_NODE_PTR,
offsets);
rec_offs_make_valid(rec, index, offsets);
/* Copy the extra bytes (backwards). */
{
byte* start = rec_get_start(rec, offsets);
byte* b = rec - REC_N_NEW_EXTRA_BYTES;
while (b != start) {
*--b = *data++;
}
}
/* Copy the data bytes. */
if (UNIV_UNLIKELY(rec_offs_any_extern(offsets))) {
/* Non-leaf nodes should not contain any
externally stored columns. */
if (UNIV_UNLIKELY(hs & REC_STATUS_NODE_PTR)) {
return(NULL);
}
data = page_zip_apply_log_ext(
rec, offsets, trx_id_col, data, end);
if (UNIV_UNLIKELY(!data)) {
return(NULL);
}
} else if (UNIV_UNLIKELY(hs & REC_STATUS_NODE_PTR)) {
len = rec_offs_data_size(offsets)
- REC_NODE_PTR_SIZE;
/* Copy the data bytes, except node_ptr. */
if (UNIV_UNLIKELY(data + len >= end)) {
return(NULL);
}
memcpy(rec, data, len);
data += len;
} else if (UNIV_LIKELY(trx_id_col == ULINT_UNDEFINED)) {
len = rec_offs_data_size(offsets);
/* Copy all data bytes of
a record in a secondary index. */
if (UNIV_UNLIKELY(data + len >= end)) {
return(NULL);
}
memcpy(rec, data, len);
data += len;
} else {
/* Skip DB_TRX_ID and DB_ROLL_PTR. */
ulint l = rec_get_nth_field_offs(offsets,
trx_id_col, &len);
byte* b;
if (UNIV_UNLIKELY(data + l >= end)
|| UNIV_UNLIKELY(len < (DATA_TRX_ID_LEN
+ DATA_ROLL_PTR_LEN))) {
return(NULL);
}
/* Copy any preceding data bytes. */
memcpy(rec, data, l);
data += l;
/* Copy any bytes following DB_TRX_ID, DB_ROLL_PTR. */
b = rec + l + (DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN);
len = rec_get_end(rec, offsets) - b;
if (UNIV_UNLIKELY(data + len >= end)) {
return(NULL);
}
memcpy(b, data, len);
data += len;
}
}
}
/**************************************************************************
Decompress the records of a node pointer page. */
static
ibool
page_zip_decompress_node_ptrs(
/*==========================*/
/* out: TRUE on success,
FALSE on failure */
page_zip_des_t* page_zip, /* in/out: compressed page */
z_stream* d_stream, /* in/out: compressed page stream */
rec_t** recs, /* in: dense page directory
sorted by address */
ulint n_dense, /* in: size of recs[] */
dict_index_t* index, /* in: the index of the page */
ulint* offsets, /* in/out: temporary offsets */
mem_heap_t* heap) /* in: temporary memory heap */
{
ulint heap_status = REC_STATUS_NODE_PTR
| PAGE_HEAP_NO_USER_LOW << REC_HEAP_NO_SHIFT;
ulint slot;
const byte* storage;
/* Subtract the space reserved for uncompressed data. */
d_stream->avail_in -= n_dense
* (PAGE_ZIP_DIR_SLOT_SIZE + REC_NODE_PTR_SIZE);
/* Decompress the records in heap_no order. */
for (slot = 0; slot < n_dense; slot++) {
rec_t* rec = recs[slot];
d_stream->avail_out = rec - REC_N_NEW_EXTRA_BYTES
- d_stream->next_out;
ut_ad(d_stream->avail_out < UNIV_PAGE_SIZE
- PAGE_ZIP_START - PAGE_DIR);
switch (inflate(d_stream, Z_SYNC_FLUSH)) {
case Z_STREAM_END:
/* Apparently, n_dense has grown
since the time the page was last compressed. */
goto zlib_done;
case Z_OK:
case Z_BUF_ERROR:
if (!d_stream->avail_out) {
break;
}
/* fall through */
default:
goto zlib_error;
}
ut_ad(d_stream->next_out == rec - REC_N_NEW_EXTRA_BYTES);
/* Prepare to decompress the data bytes. */
d_stream->next_out = rec;
/* Set heap_no and the status bits. */
mach_write_to_2(rec - REC_NEW_HEAP_NO, heap_status);
heap_status += 1 << REC_HEAP_NO_SHIFT;
/* Read the offsets. The status bits are needed here. */
offsets = rec_get_offsets(rec, index, offsets,
ULINT_UNDEFINED, &heap);
/* Non-leaf nodes should not have any externally
stored columns. */
ut_ad(!rec_offs_any_extern(offsets));
/* Decompress the data bytes, except node_ptr. */
d_stream->avail_out = rec_offs_data_size(offsets)
- REC_NODE_PTR_SIZE;
switch (inflate(d_stream, Z_SYNC_FLUSH)) {
case Z_STREAM_END:
goto zlib_done;
case Z_OK:
case Z_BUF_ERROR:
if (!d_stream->avail_out) {
break;
}
/* fall through */
default:
goto zlib_error;
}
/* Clear the node pointer in case the record
will be deleted and the space will be reallocated
to a smaller record. */
memset(d_stream->next_out, 0, REC_NODE_PTR_SIZE);
d_stream->next_out += REC_NODE_PTR_SIZE;
ut_ad(d_stream->next_out == rec_get_end(rec, offsets));
}
/* Decompress any trailing garbage, in case the last record was
allocated from an originally longer space on the free list. */
d_stream->avail_out = page_header_get_field(page_zip->data,
PAGE_HEAP_TOP)
- page_offset(d_stream->next_out);
if (UNIV_UNLIKELY(d_stream->avail_out > UNIV_PAGE_SIZE
- PAGE_ZIP_START - PAGE_DIR)) {
goto zlib_error;
}
if (UNIV_UNLIKELY(inflate(d_stream, Z_FINISH) != Z_STREAM_END)) {
zlib_error:
inflateEnd(d_stream);
return(FALSE);
}
/* Note that d_stream->avail_out > 0 may hold here
if the modification log is nonempty. */
zlib_done:
if (UNIV_UNLIKELY(inflateEnd(d_stream) != Z_OK)) {
ut_error;
}
{
page_t* page = page_align(d_stream->next_out);
/* Clear the unused heap space on the uncompressed page. */
memset(d_stream->next_out, 0,
page_dir_get_nth_slot(page,
page_dir_get_n_slots(page) - 1)
- d_stream->next_out);
}
#ifdef UNIV_DEBUG
page_zip->m_start = PAGE_DATA + d_stream->total_in;
#endif /* UNIV_DEBUG */
/* Apply the modification log. */
{
const byte* mod_log_ptr;
mod_log_ptr = page_zip_apply_log(d_stream->next_in,
d_stream->avail_in + 1,
recs, n_dense,
ULINT_UNDEFINED, heap_status,
index, offsets);
if (UNIV_UNLIKELY(!mod_log_ptr)) {
return(FALSE);
}
page_zip->m_end = mod_log_ptr - page_zip->data;
page_zip->m_nonempty = mod_log_ptr != d_stream->next_in;
ut_a(page_zip_get_trailer_len(page_zip,
dict_index_is_clust(index), NULL)
+ page_zip->m_end < page_zip_get_size(page_zip));
}
/* Restore the uncompressed columns in heap_no order. */
storage = page_zip->data + page_zip_get_size(page_zip)
- n_dense * PAGE_ZIP_DIR_SLOT_SIZE;
for (slot = 0; slot < n_dense; slot++) {
rec_t* rec = recs[slot];
offsets = rec_get_offsets(rec, index, offsets,
ULINT_UNDEFINED, &heap);
/* Non-leaf nodes should not have any externally
stored columns. */
ut_ad(!rec_offs_any_extern(offsets));
storage -= REC_NODE_PTR_SIZE;
memcpy(rec_get_end(rec, offsets) - REC_NODE_PTR_SIZE,
storage, REC_NODE_PTR_SIZE);
}
return(TRUE);
}
/**************************************************************************
Decompress the records of a leaf node of a secondary index. */
static
ibool
page_zip_decompress_sec(
/*====================*/
/* out: TRUE on success,
FALSE on failure */
page_zip_des_t* page_zip, /* in/out: compressed page */
z_stream* d_stream, /* in/out: compressed page stream */
rec_t** recs, /* in: dense page directory
sorted by address */
ulint n_dense, /* in: size of recs[] */
dict_index_t* index, /* in: the index of the page */
ulint* offsets) /* in/out: temporary offsets */
{
ulint heap_status = REC_STATUS_ORDINARY
| PAGE_HEAP_NO_USER_LOW << REC_HEAP_NO_SHIFT;
ulint slot;
ut_a(!dict_index_is_clust(index));
/* Subtract the space reserved for uncompressed data. */
d_stream->avail_in -= n_dense * PAGE_ZIP_DIR_SLOT_SIZE;
for (slot = 0; slot < n_dense; slot++) {
rec_t* rec = recs[slot];
/* Decompress everything up to this record. */
d_stream->avail_out = rec - REC_N_NEW_EXTRA_BYTES
- d_stream->next_out;
if (UNIV_LIKELY(d_stream->avail_out)) {
switch (inflate(d_stream, Z_SYNC_FLUSH)) {
case Z_STREAM_END:
/* Apparently, n_dense has grown
since the time the page was last compressed. */
goto zlib_done;
case Z_OK:
case Z_BUF_ERROR:
if (!d_stream->avail_out) {
break;
}
/* fall through */
default:
goto zlib_error;
}
}
ut_ad(d_stream->next_out == rec - REC_N_NEW_EXTRA_BYTES);
/* Skip the REC_N_NEW_EXTRA_BYTES. */
d_stream->next_out = rec;
/* Set heap_no and the status bits. */
mach_write_to_2(rec - REC_NEW_HEAP_NO, heap_status);
heap_status += 1 << REC_HEAP_NO_SHIFT;
}
/* Decompress the data of the last record and any trailing garbage,
in case the last record was allocated from an originally longer space
on the free list. */
d_stream->avail_out = page_header_get_field(page_zip->data,
PAGE_HEAP_TOP)
- page_offset(d_stream->next_out);
if (UNIV_UNLIKELY(d_stream->avail_out > UNIV_PAGE_SIZE
- PAGE_ZIP_START - PAGE_DIR)) {
goto zlib_error;
}
if (UNIV_UNLIKELY(inflate(d_stream, Z_FINISH) != Z_STREAM_END)) {
zlib_error:
inflateEnd(d_stream);
return(FALSE);
}
/* Note that d_stream->avail_out > 0 may hold here
if the modification log is nonempty. */
zlib_done:
if (UNIV_UNLIKELY(inflateEnd(d_stream) != Z_OK)) {
ut_error;
}
{
page_t* page = page_align(d_stream->next_out);
/* Clear the unused heap space on the uncompressed page. */
memset(d_stream->next_out, 0,
page_dir_get_nth_slot(page,
page_dir_get_n_slots(page) - 1)
- d_stream->next_out);
}
#ifdef UNIV_DEBUG
page_zip->m_start = PAGE_DATA + d_stream->total_in;
#endif /* UNIV_DEBUG */
/* Apply the modification log. */
{
const byte* mod_log_ptr;
mod_log_ptr = page_zip_apply_log(d_stream->next_in,
d_stream->avail_in + 1,
recs, n_dense,
ULINT_UNDEFINED, heap_status,
index, offsets);
if (UNIV_UNLIKELY(!mod_log_ptr)) {
return(FALSE);
}
page_zip->m_end = mod_log_ptr - page_zip->data;
page_zip->m_nonempty = mod_log_ptr != d_stream->next_in;
ut_a(page_zip_get_trailer_len(page_zip, FALSE, NULL)
+ page_zip->m_end < page_zip_get_size(page_zip));
}
/* There are no uncompressed columns on leaf pages of
secondary indexes. */
return(TRUE);
}
/**************************************************************************
Decompress a record of a leaf node of a clustered index that contains
externally stored columns. */
static
ibool
page_zip_decompress_clust_ext(
/*==========================*/
/* out: TRUE on success */
z_stream* d_stream, /* in/out: compressed page stream */
rec_t* rec, /* in/out: record */
const ulint* offsets, /* in: rec_get_offsets(rec) */
ulint trx_id_col) /* in: position of of DB_TRX_ID */
{
ulint i;
for (i = 0; i < rec_offs_n_fields(offsets); i++) {
ulint len;
byte* dst;
if (UNIV_UNLIKELY(i == trx_id_col)) {
/* Skip trx_id and roll_ptr */
dst = rec_get_nth_field(rec, offsets, i, &len);
if (UNIV_UNLIKELY(len < DATA_TRX_ID_LEN
+ DATA_ROLL_PTR_LEN)
|| rec_offs_nth_extern(offsets, i)) {
return(FALSE);
}
d_stream->avail_out = dst - d_stream->next_out;
switch (inflate(d_stream, Z_SYNC_FLUSH)) {
case Z_STREAM_END:
case Z_OK:
case Z_BUF_ERROR:
if (!d_stream->avail_out) {
break;
}
/* fall through */
default:
return(FALSE);
}
ut_ad(d_stream->next_out == dst);
d_stream->next_out += DATA_TRX_ID_LEN
+ DATA_ROLL_PTR_LEN;
} else if (rec_offs_nth_extern(offsets, i)) {
dst = rec_get_nth_field(rec, offsets, i, &len);
ut_ad(len >= BTR_EXTERN_FIELD_REF_SIZE);
dst += len - BTR_EXTERN_FIELD_REF_SIZE;
d_stream->avail_out = dst - d_stream->next_out;
switch (inflate(d_stream,
Z_SYNC_FLUSH)) {
case Z_STREAM_END:
case Z_OK:
case Z_BUF_ERROR:
if (!d_stream->avail_out) {
break;
}
/* fall through */
default:
return(FALSE);
}
ut_ad(d_stream->next_out == dst);
/* Reserve space for the data at
the end of the space reserved for
the compressed data and the
page modification log. */
if (UNIV_UNLIKELY
(d_stream->avail_in
<= BTR_EXTERN_FIELD_REF_SIZE)) {
/* out of space */
return(FALSE);
}
/* Clear the BLOB pointer in case
the record will be deleted and the
space will not be reused. Note that
the final initialization of the BLOB
pointers (copying from "externs"
or clearing) will have to take place
only after the page modification log
has been applied. Otherwise, we
could end up with an uninitialized
BLOB pointer when a record is deleted,
reallocated and deleted. */
memset(d_stream->next_out, 0,
BTR_EXTERN_FIELD_REF_SIZE);
d_stream->next_out
+= BTR_EXTERN_FIELD_REF_SIZE;
}
}
return(TRUE);
}
/**************************************************************************
Compress the records of a leaf node of a clustered index. */
static
ibool
page_zip_decompress_clust(
/*======================*/
/* out: TRUE on success,
FALSE on failure */
page_zip_des_t* page_zip, /* in/out: compressed page */
z_stream* d_stream, /* in/out: compressed page stream */
rec_t** recs, /* in: dense page directory
sorted by address */
ulint n_dense, /* in: size of recs[] */
dict_index_t* index, /* in: the index of the page */
ulint trx_id_col, /* index of the trx_id column */
ulint* offsets, /* in/out: temporary offsets */
mem_heap_t* heap) /* in: temporary memory heap */
{
int err;
ulint slot;
ulint heap_status = REC_STATUS_ORDINARY
| PAGE_HEAP_NO_USER_LOW << REC_HEAP_NO_SHIFT;
const byte* storage;
const byte* externs;
ut_a(dict_index_is_clust(index));
/* Subtract the space reserved for uncompressed data. */
d_stream->avail_in -= n_dense * (PAGE_ZIP_DIR_SLOT_SIZE
+ DATA_TRX_ID_LEN
+ DATA_ROLL_PTR_LEN);
/* Decompress the records in heap_no order. */
for (slot = 0; slot < n_dense; slot++) {
rec_t* rec = recs[slot];
d_stream->avail_out = rec - REC_N_NEW_EXTRA_BYTES
- d_stream->next_out;
ut_ad(d_stream->avail_out < UNIV_PAGE_SIZE
- PAGE_ZIP_START - PAGE_DIR);
err = inflate(d_stream, Z_SYNC_FLUSH);
switch (err) {
case Z_STREAM_END:
/* Apparently, n_dense has grown
since the time the page was last compressed. */
goto zlib_done;
case Z_OK:
case Z_BUF_ERROR:
if (UNIV_LIKELY(!d_stream->avail_out)) {
break;
}
/* fall through */
default:
goto zlib_error;
}
ut_ad(d_stream->next_out == rec - REC_N_NEW_EXTRA_BYTES);
/* Prepare to decompress the data bytes. */
d_stream->next_out = rec;
/* Set heap_no and the status bits. */
mach_write_to_2(rec - REC_NEW_HEAP_NO, heap_status);
heap_status += 1 << REC_HEAP_NO_SHIFT;
/* Read the offsets. The status bits are needed here. */
offsets = rec_get_offsets(rec, index, offsets,
ULINT_UNDEFINED, &heap);
/* This is a leaf page in a clustered index. */
/* Check if there are any externally stored columns.
For each externally stored column, restore the
BTR_EXTERN_FIELD_REF separately. */
if (UNIV_UNLIKELY(rec_offs_any_extern(offsets))) {
if (UNIV_UNLIKELY
(!page_zip_decompress_clust_ext(
d_stream, rec, offsets, trx_id_col))) {
goto zlib_error;
}
} else {
/* Skip trx_id and roll_ptr */
ulint len;
byte* dst = rec_get_nth_field(rec, offsets,
trx_id_col, &len);
if (UNIV_UNLIKELY(len < DATA_TRX_ID_LEN
+ DATA_ROLL_PTR_LEN)) {
goto zlib_error;
}
d_stream->avail_out = dst - d_stream->next_out;
switch (inflate(d_stream, Z_SYNC_FLUSH)) {
case Z_STREAM_END:
case Z_OK:
case Z_BUF_ERROR:
if (!d_stream->avail_out) {
break;
}
/* fall through */
default:
goto zlib_error;
}
ut_ad(d_stream->next_out == dst);
d_stream->next_out += DATA_TRX_ID_LEN
+ DATA_ROLL_PTR_LEN;
}
/* Decompress the last bytes of the record. */
d_stream->avail_out = rec_get_end(rec, offsets)
- d_stream->next_out;
switch (inflate(d_stream, Z_SYNC_FLUSH)) {
case Z_STREAM_END:
case Z_OK:
case Z_BUF_ERROR:
if (!d_stream->avail_out) {
break;
}
/* fall through */
default:
goto zlib_error;
}
}
/* Decompress any trailing garbage, in case the last record was
allocated from an originally longer space on the free list. */
d_stream->avail_out = page_header_get_field(page_zip->data,
PAGE_HEAP_TOP)
- page_offset(d_stream->next_out);
if (UNIV_UNLIKELY(d_stream->avail_out > UNIV_PAGE_SIZE
- PAGE_ZIP_START - PAGE_DIR)) {
goto zlib_error;
}
if (UNIV_UNLIKELY(inflate(d_stream, Z_FINISH) != Z_STREAM_END)) {
zlib_error:
inflateEnd(d_stream);
return(FALSE);
}
/* Note that d_stream->avail_out > 0 may hold here
if the modification log is nonempty. */
zlib_done:
if (UNIV_UNLIKELY(inflateEnd(d_stream) != Z_OK)) {
ut_error;
}
{
page_t* page = page_align(d_stream->next_out);
/* Clear the unused heap space on the uncompressed page. */
memset(d_stream->next_out, 0,
page_dir_get_nth_slot(page,
page_dir_get_n_slots(page) - 1)
- d_stream->next_out);
}
#ifdef UNIV_DEBUG
page_zip->m_start = PAGE_DATA + d_stream->total_in;
#endif /* UNIV_DEBUG */
/* Apply the modification log. */
{
const byte* mod_log_ptr;
mod_log_ptr = page_zip_apply_log(d_stream->next_in,
d_stream->avail_in + 1,
recs, n_dense,
trx_id_col, heap_status,
index, offsets);
if (UNIV_UNLIKELY(!mod_log_ptr)) {
return(FALSE);
}
page_zip->m_end = mod_log_ptr - page_zip->data;
page_zip->m_nonempty = mod_log_ptr != d_stream->next_in;
ut_a(page_zip_get_trailer_len(page_zip, TRUE, NULL)
+ page_zip->m_end < page_zip_get_size(page_zip));
}
storage = page_zip->data + page_zip_get_size(page_zip)
- n_dense * PAGE_ZIP_DIR_SLOT_SIZE;
externs = storage - n_dense
* (DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN);
/* Restore the uncompressed columns in heap_no order. */
for (slot = 0; slot < n_dense; slot++) {
ulint i;
ulint len;
byte* dst;
rec_t* rec = recs[slot];
ibool exists = !page_zip_dir_find_free(
page_zip, page_offset(rec));
offsets = rec_get_offsets(rec, index, offsets,
ULINT_UNDEFINED, &heap);
dst = rec_get_nth_field(rec, offsets,
trx_id_col, &len);
ut_ad(len >= DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN);
storage -= DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN;
memcpy(dst, storage,
DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN);
/* Check if there are any externally stored
columns in this record. For each externally
stored column, restore or clear the
BTR_EXTERN_FIELD_REF. */
if (!rec_offs_any_extern(offsets)) {
continue;
}
for (i = 0; i < rec_offs_n_fields(offsets); i++) {
if (!rec_offs_nth_extern(offsets, i)) {
continue;
}
dst = rec_get_nth_field(rec, offsets, i, &len);
ut_ad(len >= BTR_EXTERN_FIELD_REF_SIZE);
dst += len - BTR_EXTERN_FIELD_REF_SIZE;
if (UNIV_LIKELY(exists)) {
/* Existing record:
restore the BLOB pointer */
externs -= BTR_EXTERN_FIELD_REF_SIZE;
memcpy(dst, externs,
BTR_EXTERN_FIELD_REF_SIZE);
page_zip->n_blobs++;
} else {
/* Deleted record:
clear the BLOB pointer */
memset(dst, 0,
BTR_EXTERN_FIELD_REF_SIZE);
}
}
}
return(TRUE);
}
/**************************************************************************
Decompress a page. This function should tolerate errors on the compressed
page. Instead of letting assertions fail, it will return FALSE if an
inconsistency is detected. */
ibool
page_zip_decompress(
/*================*/
/* out: TRUE on success, FALSE on failure */
page_zip_des_t* page_zip,/* in: data, size;
out: m_start, m_end, m_nonempty, n_blobs */
page_t* page) /* out: uncompressed page, may be trashed */
{
z_stream d_stream;
dict_index_t* index = NULL;
rec_t** recs; /* dense page directory, sorted by address */
ulint n_dense;/* number of user records on the page */
ulint trx_id_col = ULINT_UNDEFINED;
mem_heap_t* heap;
ulint* offsets;
ut_ad(page_zip_simple_validate(page_zip));
/* The dense directory excludes the infimum and supremum records. */
n_dense = page_dir_get_n_heap(page_zip->data) - PAGE_HEAP_NO_USER_LOW;
if (UNIV_UNLIKELY(n_dense * PAGE_ZIP_DIR_SLOT_SIZE
>= page_zip_get_size(page_zip))) {
return(FALSE);
}
heap = mem_heap_create(n_dense * (3 * sizeof *recs) + UNIV_PAGE_SIZE);
recs = mem_heap_alloc(heap, n_dense * (2 * sizeof *recs));
#ifdef UNIV_ZIP_DEBUG
/* Clear the page. */
memset(page, 0x55, UNIV_PAGE_SIZE);
#endif /* UNIV_ZIP_DEBUG */
/* Copy the page header. */
memcpy(page, page_zip->data, PAGE_DATA);
/* Copy the page directory. */
if (UNIV_UNLIKELY(!page_zip_dir_decode(page_zip, page, recs,
recs + n_dense, n_dense))) {
zlib_error:
mem_heap_free(heap);
return(FALSE);
}
/* Copy the infimum and supremum records. */
memcpy(page + (PAGE_NEW_INFIMUM - REC_N_NEW_EXTRA_BYTES),
infimum_extra, sizeof infimum_extra);
if (UNIV_UNLIKELY(!page_get_n_recs(page))) {
rec_set_next_offs_new(page + PAGE_NEW_INFIMUM,
PAGE_NEW_SUPREMUM);
} else {
rec_set_next_offs_new(page + PAGE_NEW_INFIMUM,
page_zip_dir_get(page_zip, 0)
& PAGE_ZIP_DIR_SLOT_MASK);
}
memcpy(page + PAGE_NEW_INFIMUM, infimum_data, sizeof infimum_data);
memcpy(page + (PAGE_NEW_SUPREMUM - REC_N_NEW_EXTRA_BYTES + 1),
supremum_extra_data, sizeof supremum_extra_data);
page_zip_set_alloc(&d_stream, heap);
if (UNIV_UNLIKELY(inflateInit2(&d_stream, UNIV_PAGE_SIZE_SHIFT)
!= Z_OK)) {
ut_error;
}
d_stream.next_in = page_zip->data + PAGE_DATA;
/* Subtract the space reserved for
the page header and the end marker of the modification log. */
d_stream.avail_in = page_zip_get_size(page_zip) - (PAGE_DATA + 1);
d_stream.next_out = page + PAGE_ZIP_START;
d_stream.avail_out = UNIV_PAGE_SIZE - PAGE_ZIP_START;
/* Decode the zlib header and the index information. */
if (UNIV_UNLIKELY(inflate(&d_stream, Z_BLOCK) != Z_OK)
|| UNIV_UNLIKELY(inflate(&d_stream, Z_BLOCK) != Z_OK)) {
goto zlib_error;
}
index = page_zip_fields_decode(
page + PAGE_ZIP_START, d_stream.next_out,
page_is_leaf(page) ? &trx_id_col : NULL);
if (UNIV_UNLIKELY(!index)) {
goto zlib_error;
}
/* Decompress the user records. */
page_zip->n_blobs = 0;
d_stream.next_out = page + PAGE_ZIP_START;
{
/* Pre-allocate the offsets for rec_get_offsets_reverse(). */
ulint n = 1 + 1/* node ptr */ + REC_OFFS_HEADER_SIZE
+ dict_index_get_n_fields(index);
offsets = mem_heap_alloc(heap, n * sizeof(ulint));
*offsets = n;
}
/* Decompress the records in heap_no order. */
if (!page_is_leaf(page)) {
/* This is a node pointer page. */
ulint info_bits;
if (UNIV_UNLIKELY
(!page_zip_decompress_node_ptrs(page_zip, &d_stream,
recs, n_dense, index,
offsets, heap))) {
goto err_exit;
}
info_bits = mach_read_from_4(page + FIL_PAGE_PREV) == FIL_NULL
? REC_INFO_MIN_REC_FLAG : 0;
if (UNIV_UNLIKELY(!page_zip_set_extra_bytes(page_zip, page,
info_bits))) {
goto err_exit;
}
} else if (UNIV_LIKELY(trx_id_col == ULINT_UNDEFINED)) {
/* This is a leaf page in a secondary index. */
if (UNIV_UNLIKELY(!page_zip_decompress_sec(page_zip, &d_stream,
recs, n_dense,
index, offsets))) {
goto err_exit;
}
if (UNIV_UNLIKELY(!page_zip_set_extra_bytes(page_zip,
page, 0))) {
err_exit:
page_zip_fields_free(index);
mem_heap_free(heap);
return(FALSE);
}
} else {
/* This is a leaf page in a clustered index. */
if (UNIV_UNLIKELY(!page_zip_decompress_clust(page_zip,
&d_stream, recs,
n_dense, index,
trx_id_col,
offsets, heap))) {
goto err_exit;
}
if (UNIV_UNLIKELY(!page_zip_set_extra_bytes(page_zip,
page, 0))) {
goto err_exit;
}
}
ut_a(page_is_comp(page));
page_zip_fields_free(index);
mem_heap_free(heap);
page_zip_decompress_count[page_zip->ssize]++;
return(TRUE);
}
#ifdef UNIV_ZIP_DEBUG
/* Flag: make page_zip_validate() compare page headers only */
ibool page_zip_validate_header_only = FALSE;
/**************************************************************************
Check that the compressed and decompressed pages match. */
ibool
page_zip_validate(
/*==============*/
/* out: TRUE if valid, FALSE if not */
const page_zip_des_t* page_zip,/* in: compressed page */
const page_t* page) /* in: uncompressed page */
{
page_zip_des_t temp_page_zip = *page_zip;
byte* temp_page_buf;
page_t* temp_page;
ibool valid;
if (memcmp(page_zip->data + FIL_PAGE_PREV, page + FIL_PAGE_PREV,
FIL_PAGE_LSN - FIL_PAGE_PREV)
|| memcmp(page_zip->data + FIL_PAGE_TYPE, page + FIL_PAGE_TYPE, 2)
|| memcmp(page_zip->data + FIL_PAGE_DATA, page + FIL_PAGE_DATA,
PAGE_DATA - FIL_PAGE_DATA)) {
fputs("page_zip_validate(): page header mismatch\n", stderr);
return(FALSE);
}
ut_a(page_is_comp(page));
if (page_zip_validate_header_only) {
return(TRUE);
}
/* page_zip_decompress() expects the uncompressed page to be
UNIV_PAGE_SIZE aligned. */
temp_page_buf = ut_malloc(2 * UNIV_PAGE_SIZE);
temp_page = ut_align(temp_page_buf, UNIV_PAGE_SIZE);
valid = page_zip_decompress(&temp_page_zip, temp_page);
if (!valid) {
fputs("page_zip_validate(): failed to decompress\n", stderr);
goto func_exit;
}
if (page_zip->n_blobs != temp_page_zip.n_blobs) {
fprintf(stderr,
"page_zip_validate(): n_blobs mismatch: %d!=%d\n",
page_zip->n_blobs, temp_page_zip.n_blobs);
valid = FALSE;
}
#ifdef UNIV_DEBUG
if (page_zip->m_start != temp_page_zip.m_start) {
fprintf(stderr,
"page_zip_validate(): m_start mismatch: %d!=%d\n",
page_zip->m_start, temp_page_zip.m_start);
valid = FALSE;
}
#endif /* UNIV_DEBUG */
if (page_zip->m_end != temp_page_zip.m_end) {
fprintf(stderr,
"page_zip_validate(): m_end mismatch: %d!=%d\n",
page_zip->m_end, temp_page_zip.m_end);
valid = FALSE;
}
if (page_zip->m_nonempty != temp_page_zip.m_nonempty) {
fprintf(stderr,
"page_zip_validate(): m_nonempty mismatch: %d!=%d\n",
page_zip->m_nonempty, temp_page_zip.m_nonempty);
valid = FALSE;
}
if (memcmp(page + PAGE_HEADER, temp_page + PAGE_HEADER,
UNIV_PAGE_SIZE - PAGE_HEADER - FIL_PAGE_DATA_END)) {
fputs("page_zip_validate(): content mismatch\n", stderr);
valid = FALSE;
}
func_exit:
ut_free(temp_page_buf);
return(valid);
}
#endif /* UNIV_ZIP_DEBUG */
#ifdef UNIV_DEBUG
static
ibool
page_zip_header_cmp(
/*================*/
/* out: TRUE */
const page_zip_des_t* page_zip,/* in: compressed page */
const byte* page) /* in: uncompressed page */
{
ut_ad(!memcmp(page_zip->data + FIL_PAGE_PREV, page + FIL_PAGE_PREV,
FIL_PAGE_LSN - FIL_PAGE_PREV));
ut_ad(!memcmp(page_zip->data + FIL_PAGE_TYPE, page + FIL_PAGE_TYPE,
2));
ut_ad(!memcmp(page_zip->data + FIL_PAGE_DATA, page + FIL_PAGE_DATA,
PAGE_DATA - FIL_PAGE_DATA));
return(TRUE);
}
#endif /* UNIV_DEBUG */
/**************************************************************************
Write a record on the compressed page that contains externally stored
columns. The data must already have been written to the uncompressed page. */
static
byte*
page_zip_write_rec_ext(
/*===================*/
/* out: end of modification log */
page_zip_des_t* page_zip, /* in/out: compressed page */
const page_t* page, /* in: page containing rec */
const byte* rec, /* in: record being written */
dict_index_t* index, /* in: record descriptor */
const ulint* offsets, /* in: rec_get_offsets(rec, index) */
ulint create, /* in: nonzero=insert, zero=update */
ulint trx_id_col, /* in: position of DB_TRX_ID */
ulint heap_no, /* in: heap number of rec */
byte* storage, /* in: end of dense page directory */
byte* data) /* in: end of modification log */
{
const byte* start = rec;
ulint i;
ulint len;
byte* externs = storage;
ulint n_ext = rec_offs_n_extern(offsets);
ut_ad(rec_offs_validate(rec, index, offsets));
externs -= (DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN)
* (page_dir_get_n_heap(page) - PAGE_HEAP_NO_USER_LOW);
/* Note that this will not take into account
the BLOB columns of rec if create==TRUE. */
ut_ad(data + rec_offs_data_size(offsets)
- (DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN)
- n_ext * BTR_EXTERN_FIELD_REF_SIZE
< externs - BTR_EXTERN_FIELD_REF_SIZE * page_zip->n_blobs);
{
ulint blob_no = page_zip_get_n_prev_extern(
page_zip, rec, index);
byte* ext_end = externs - page_zip->n_blobs
* BTR_EXTERN_FIELD_REF_SIZE;
ut_ad(blob_no <= page_zip->n_blobs);
externs -= blob_no * BTR_EXTERN_FIELD_REF_SIZE;
if (create) {
page_zip->n_blobs += n_ext;
ut_ad(!memcmp
(ext_end - n_ext
* BTR_EXTERN_FIELD_REF_SIZE,
zero,
BTR_EXTERN_FIELD_REF_SIZE));
memmove(ext_end - n_ext
* BTR_EXTERN_FIELD_REF_SIZE,
ext_end,
externs - ext_end);
}
ut_a(blob_no + n_ext <= page_zip->n_blobs);
}
for (i = 0; i < rec_offs_n_fields(offsets); i++) {
const byte* src;
if (UNIV_UNLIKELY(i == trx_id_col)) {
ut_ad(!rec_offs_nth_extern(offsets,
i));
ut_ad(!rec_offs_nth_extern(offsets,
i + 1));
/* Locate trx_id and roll_ptr. */
src = rec_get_nth_field(rec, offsets,
i, &len);
ut_ad(len == DATA_TRX_ID_LEN);
ut_ad(src + DATA_TRX_ID_LEN
== rec_get_nth_field(
rec, offsets,
i + 1, &len));
ut_ad(len == DATA_ROLL_PTR_LEN);
/* Log the preceding fields. */
ut_ad(!memcmp(data, zero,
ut_min(src - start,
sizeof zero)));
memcpy(data, start, src - start);
data += src - start;
start = src + (DATA_TRX_ID_LEN
+ DATA_ROLL_PTR_LEN);
/* Store trx_id and roll_ptr. */
memcpy(storage - (DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN)
* (heap_no - 1),
src, DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN);
i++; /* skip also roll_ptr */
} else if (rec_offs_nth_extern(offsets, i)) {
src = rec_get_nth_field(rec, offsets,
i, &len);
ut_ad(dict_index_is_clust(index));
ut_ad(len
>= BTR_EXTERN_FIELD_REF_SIZE);
src += len - BTR_EXTERN_FIELD_REF_SIZE;
ut_ad(!memcmp(data, zero,
ut_min(src - start, sizeof zero)));
memcpy(data, start, src - start);
data += src - start;
start = src + BTR_EXTERN_FIELD_REF_SIZE;
/* Store the BLOB pointer. */
externs -= BTR_EXTERN_FIELD_REF_SIZE;
ut_ad(data < externs);
memcpy(externs, src, BTR_EXTERN_FIELD_REF_SIZE);
}
}
/* Log the last bytes of the record. */
len = rec_offs_data_size(offsets) - (start - rec);
ut_ad(!memcmp(data, zero, ut_min(len, sizeof zero)));
memcpy(data, start, len);
data += len;
return(data);
}
/**************************************************************************
Write an entire record on the compressed page. The data must already
have been written to the uncompressed page. */
void
page_zip_write_rec(
/*===============*/
page_zip_des_t* page_zip,/* in/out: compressed page */
const byte* rec, /* in: record being written */
dict_index_t* index, /* in: the index the record belongs to */
const ulint* offsets,/* in: rec_get_offsets(rec, index) */
ulint create) /* in: nonzero=insert, zero=update */
{
const page_t* page;
byte* data;
byte* storage;
ulint heap_no;
byte* slot;
ut_ad(buf_frame_get_page_zip((byte*) rec) == page_zip);
ut_ad(page_zip_simple_validate(page_zip));
ut_ad(page_zip_get_size(page_zip)
> PAGE_DATA + page_zip_dir_size(page_zip));
ut_ad(rec_offs_comp(offsets));
ut_ad(rec_offs_validate(rec, index, offsets));
ut_ad(page_zip->m_start >= PAGE_DATA);
page = page_align((rec_t*) rec);
ut_ad(page_zip_header_cmp(page_zip, page));
ut_ad(page_simple_validate_new((page_t*) page));
slot = page_zip_dir_find(page_zip, page_offset(rec));
ut_a(slot);
/* Copy the delete mark. */
if (rec_get_deleted_flag(rec, TRUE)) {
*slot |= PAGE_ZIP_DIR_SLOT_DEL >> 8;
} else {
*slot &= ~(PAGE_ZIP_DIR_SLOT_DEL >> 8);
}
ut_ad(rec_get_start((rec_t*) rec, offsets) >= page + PAGE_ZIP_START);
ut_ad(rec_get_end((rec_t*) rec, offsets) <= page + UNIV_PAGE_SIZE
- PAGE_DIR - PAGE_DIR_SLOT_SIZE
* page_dir_get_n_slots(page));
heap_no = rec_get_heap_no_new(rec);
ut_ad(heap_no >= PAGE_HEAP_NO_USER_LOW); /* not infimum or supremum */
ut_ad(heap_no < page_dir_get_n_heap(page));
/* Append to the modification log. */
data = page_zip->data + page_zip->m_end;
ut_ad(!*data);
/* Identify the record by writing its heap number - 1.
0 is reserved to indicate the end of the modification log. */
if (UNIV_UNLIKELY(heap_no - 1 >= 64)) {
*data++ = 0x80 | (heap_no - 1) >> 7;
ut_ad(!*data);
}
*data++ = (heap_no - 1) << 1;
ut_ad(!*data);
{
const byte* start = rec_get_start((rec_t*) rec, offsets);
const byte* b = rec - REC_N_NEW_EXTRA_BYTES;
/* Write the extra bytes backwards, so that
rec_offs_extra_size() can be easily computed in
page_zip_apply_log() by invoking
rec_get_offsets_reverse(). */
while (b != start) {
*data++ = *--b;
ut_ad(!*data);
}
}
/* Write the data bytes. Store the uncompressed bytes separately. */
storage = page_zip->data + page_zip_get_size(page_zip)
- (page_dir_get_n_heap(page) - PAGE_HEAP_NO_USER_LOW)
* PAGE_ZIP_DIR_SLOT_SIZE;
if (page_is_leaf(page)) {
ulint len;
if (dict_index_is_clust(index)) {
ulint trx_id_col;
trx_id_col = dict_index_get_sys_col_pos(index,
DATA_TRX_ID);
ut_ad(trx_id_col != ULINT_UNDEFINED);
/* Store separately trx_id, roll_ptr and
the BTR_EXTERN_FIELD_REF of each BLOB column. */
if (rec_offs_any_extern(offsets)) {
data = page_zip_write_rec_ext(
page_zip, page,
rec, index, offsets, create,
trx_id_col, heap_no, storage, data);
} else {
/* Locate trx_id and roll_ptr. */
const byte* src
= rec_get_nth_field(rec, offsets,
trx_id_col, &len);
ut_ad(len == DATA_TRX_ID_LEN);
ut_ad(src + DATA_TRX_ID_LEN
== rec_get_nth_field(
rec, offsets,
trx_id_col + 1, &len));
ut_ad(len == DATA_ROLL_PTR_LEN);
/* Log the preceding fields. */
ut_ad(!memcmp(data, zero,
ut_min(src - rec, sizeof zero)));
memcpy(data, rec, src - rec);
data += src - rec;
/* Store trx_id and roll_ptr. */
memcpy(storage
- (DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN)
* (heap_no - 1),
src,
DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN);
src += DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN;
/* Log the last bytes of the record. */
len = rec_offs_data_size(offsets)
- (src - rec);
ut_ad(!memcmp(data, zero,
ut_min(len, sizeof zero)));
memcpy(data, src, len);
data += len;
}
} else {
/* Leaf page of a secondary index:
no externally stored columns */
ut_ad(dict_index_get_sys_col_pos(index, DATA_TRX_ID)
== ULINT_UNDEFINED);
ut_ad(!rec_offs_any_extern(offsets));
/* Log the entire record. */
len = rec_offs_data_size(offsets);
ut_ad(!memcmp(data, zero, ut_min(len, sizeof zero)));
memcpy(data, rec, len);
data += len;
}
} else {
/* This is a node pointer page. */
ulint len;
/* Non-leaf nodes should not have any externally
stored columns. */
ut_ad(!rec_offs_any_extern(offsets));
/* Copy the data bytes, except node_ptr. */
len = rec_offs_data_size(offsets) - REC_NODE_PTR_SIZE;
ut_ad(data + len < storage - REC_NODE_PTR_SIZE
* (page_dir_get_n_heap(page) - PAGE_HEAP_NO_USER_LOW));
ut_ad(!memcmp(data, zero, ut_min(len, sizeof zero)));
memcpy(data, rec, len);
data += len;
/* Copy the node pointer to the uncompressed area. */
memcpy(storage - REC_NODE_PTR_SIZE
* (heap_no - 1),
rec + len,
REC_NODE_PTR_SIZE);
}
ut_a(!*data);
ut_ad((ulint) (data - page_zip->data) < page_zip_get_size(page_zip));
page_zip->m_end = data - page_zip->data;
page_zip->m_nonempty = TRUE;
#ifdef UNIV_ZIP_DEBUG
ut_a(page_zip_validate(page_zip, page_align((byte*) rec)));
#endif /* UNIV_ZIP_DEBUG */
}
/***************************************************************
Parses a log record of writing a BLOB pointer of a record. */
byte*
page_zip_parse_write_blob_ptr(
/*==========================*/
/* out: end of log record or NULL */
byte* ptr, /* in: redo log buffer */
byte* end_ptr,/* in: redo log buffer end */
page_t* page, /* in/out: uncompressed page */
page_zip_des_t* page_zip)/* in/out: compressed page */
{
ulint offset;
ulint z_offset;
ut_ad(!page == !page_zip);
if (UNIV_UNLIKELY
(end_ptr < ptr + (2 + 2 + BTR_EXTERN_FIELD_REF_SIZE))) {
return(NULL);
}
offset = mach_read_from_2(ptr);
z_offset = mach_read_from_2(ptr + 2);
if (UNIV_UNLIKELY(offset < PAGE_ZIP_START)
|| UNIV_UNLIKELY(offset >= UNIV_PAGE_SIZE)
|| UNIV_UNLIKELY(z_offset >= UNIV_PAGE_SIZE)) {
corrupt:
recv_sys->found_corrupt_log = TRUE;
return(NULL);
}
if (page) {
if (UNIV_UNLIKELY(!page_zip)
|| UNIV_UNLIKELY(!page_is_leaf(page))) {
goto corrupt;
}
#ifdef UNIV_ZIP_DEBUG
ut_a(page_zip_validate(page_zip, page));
#endif /* UNIV_ZIP_DEBUG */
memcpy(page + offset,
ptr + 4, BTR_EXTERN_FIELD_REF_SIZE);
memcpy(page_zip->data + z_offset,
ptr + 4, BTR_EXTERN_FIELD_REF_SIZE);
#ifdef UNIV_ZIP_DEBUG
ut_a(page_zip_validate(page_zip, page));
#endif /* UNIV_ZIP_DEBUG */
}
return(ptr + (2 + 2 + BTR_EXTERN_FIELD_REF_SIZE));
}
/**************************************************************************
Write a BLOB pointer of a record on the leaf page of a clustered index.
The information must already have been updated on the uncompressed page. */
void
page_zip_write_blob_ptr(
/*====================*/
page_zip_des_t* page_zip,/* in/out: compressed page */
const byte* rec, /* in/out: record whose data is being
written */
dict_index_t* index, /* in: index of the page */
const ulint* offsets,/* in: rec_get_offsets(rec, index) */
ulint n, /* in: column index */
mtr_t* mtr) /* in: mini-transaction handle,
or NULL if no logging is needed */
{
const byte* field;
byte* externs;
page_t* page = page_align((byte*) rec);
ulint blob_no;
ulint len;
ut_ad(buf_frame_get_page_zip((byte*) rec) == page_zip);
ut_ad(page_simple_validate_new(page));
ut_ad(page_zip_simple_validate(page_zip));
ut_ad(page_zip_get_size(page_zip)
> PAGE_DATA + page_zip_dir_size(page_zip));
ut_ad(rec_offs_comp(offsets));
ut_ad(rec_offs_validate(rec, NULL, offsets));
ut_ad(rec_offs_any_extern(offsets));
ut_ad(rec_offs_nth_extern(offsets, n));
ut_ad(page_zip->m_start >= PAGE_DATA);
ut_ad(page_zip_header_cmp(page_zip, page));
ut_ad(page_is_leaf(page));
ut_ad(dict_index_is_clust(index));
blob_no = page_zip_get_n_prev_extern(page_zip, rec, index)
+ rec_get_n_extern_new(rec, index, n);
ut_a(blob_no < page_zip->n_blobs);
externs = page_zip->data + page_zip_get_size(page_zip)
- (page_dir_get_n_heap(page) - PAGE_HEAP_NO_USER_LOW)
* (PAGE_ZIP_DIR_SLOT_SIZE
+ DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN);
field = rec_get_nth_field(rec, offsets, n, &len);
externs -= (blob_no + 1) * BTR_EXTERN_FIELD_REF_SIZE;
field += len - BTR_EXTERN_FIELD_REF_SIZE;
memcpy(externs, field, BTR_EXTERN_FIELD_REF_SIZE);
#ifdef UNIV_ZIP_DEBUG
ut_a(page_zip_validate(page_zip, page_align((rec_t*) rec)));
#endif /* UNIV_ZIP_DEBUG */
if (mtr) {
byte* log_ptr = mlog_open(
mtr, 11 + 2 + 2 + BTR_EXTERN_FIELD_REF_SIZE);
if (UNIV_UNLIKELY(!log_ptr)) {
return;
}
log_ptr = mlog_write_initial_log_record_fast(
(byte*) field, MLOG_ZIP_WRITE_BLOB_PTR, log_ptr, mtr);
mach_write_to_2(log_ptr, page_offset(field));
log_ptr += 2;
mach_write_to_2(log_ptr, externs - page_zip->data);
log_ptr += 2;
memcpy(log_ptr, externs, BTR_EXTERN_FIELD_REF_SIZE);
log_ptr += BTR_EXTERN_FIELD_REF_SIZE;
mlog_close(mtr, log_ptr);
}
}
/***************************************************************
Parses a log record of writing the node pointer of a record. */
byte*
page_zip_parse_write_node_ptr(
/*==========================*/
/* out: end of log record or NULL */
byte* ptr, /* in: redo log buffer */
byte* end_ptr,/* in: redo log buffer end */
page_t* page, /* in/out: uncompressed page */
page_zip_des_t* page_zip)/* in/out: compressed page */
{
ulint offset;
ulint z_offset;
ut_ad(!page == !page_zip);
if (UNIV_UNLIKELY(end_ptr < ptr + (2 + 2 + REC_NODE_PTR_SIZE))) {
return(NULL);
}
offset = mach_read_from_2(ptr);
z_offset = mach_read_from_2(ptr + 2);
if (UNIV_UNLIKELY(offset < PAGE_ZIP_START)
|| UNIV_UNLIKELY(offset >= UNIV_PAGE_SIZE)
|| UNIV_UNLIKELY(z_offset >= UNIV_PAGE_SIZE)) {
corrupt:
recv_sys->found_corrupt_log = TRUE;
return(NULL);
}
if (page) {
byte* storage_end;
byte* field;
byte* storage;
ulint heap_no;
if (UNIV_UNLIKELY(!page_zip)
|| UNIV_UNLIKELY(page_is_leaf(page))) {
goto corrupt;
}
#ifdef UNIV_ZIP_DEBUG
ut_a(page_zip_validate(page_zip, page));
#endif /* UNIV_ZIP_DEBUG */
field = page + offset;
storage = page_zip->data + z_offset;
storage_end = page_zip->data + page_zip_get_size(page_zip)
- (page_dir_get_n_heap(page) - PAGE_HEAP_NO_USER_LOW)
* PAGE_ZIP_DIR_SLOT_SIZE;
heap_no = 1 + (storage_end - storage) / REC_NODE_PTR_SIZE;
if (UNIV_UNLIKELY((storage_end - storage) % REC_NODE_PTR_SIZE)
|| UNIV_UNLIKELY(heap_no < PAGE_HEAP_NO_USER_LOW)
|| UNIV_UNLIKELY(heap_no >= page_dir_get_n_heap(page))) {
goto corrupt;
}
memcpy(field, ptr + 4, REC_NODE_PTR_SIZE);
memcpy(storage, ptr + 4, REC_NODE_PTR_SIZE);
#ifdef UNIV_ZIP_DEBUG
ut_a(page_zip_validate(page_zip, page));
#endif /* UNIV_ZIP_DEBUG */
}
return(ptr + (2 + 2 + REC_NODE_PTR_SIZE));
}
/**************************************************************************
Write the node pointer of a record on a non-leaf compressed page. */
void
page_zip_write_node_ptr(
/*====================*/
page_zip_des_t* page_zip,/* in/out: compressed page */
byte* rec, /* in/out: record */
ulint size, /* in: data size of rec */
ulint ptr, /* in: node pointer */
mtr_t* mtr) /* in: mini-transaction, or NULL */
{
byte* field;
byte* storage;
page_t* page = page_align(rec);
ut_ad(buf_frame_get_page_zip(rec) == page_zip);
ut_ad(page_simple_validate_new(page));
ut_ad(page_zip_simple_validate(page_zip));
ut_ad(page_zip_get_size(page_zip)
> PAGE_DATA + page_zip_dir_size(page_zip));
ut_ad(page_rec_is_comp(rec));
ut_ad(page_zip->m_start >= PAGE_DATA);
ut_ad(page_zip_header_cmp(page_zip, page));
ut_ad(!page_is_leaf(page));
storage = page_zip->data + page_zip_get_size(page_zip)
- (page_dir_get_n_heap(page) - PAGE_HEAP_NO_USER_LOW)
* PAGE_ZIP_DIR_SLOT_SIZE
- (rec_get_heap_no_new(rec) - 1) * REC_NODE_PTR_SIZE;
field = rec + size - REC_NODE_PTR_SIZE;
#if defined UNIV_DEBUG || defined UNIV_ZIP_DEBUG
ut_a(!memcmp(storage, field, REC_NODE_PTR_SIZE));
#endif /* UNIV_DEBUG || UNIV_ZIP_DEBUG */
#if REC_NODE_PTR_SIZE != 4
# error "REC_NODE_PTR_SIZE != 4"
#endif
mach_write_to_4(field, ptr);
memcpy(storage, field, REC_NODE_PTR_SIZE);
if (mtr) {
byte* log_ptr = mlog_open(mtr,
11 + 2 + 2 + REC_NODE_PTR_SIZE);
if (UNIV_UNLIKELY(!log_ptr)) {
return;
}
log_ptr = mlog_write_initial_log_record_fast(
field, MLOG_ZIP_WRITE_NODE_PTR, log_ptr, mtr);
mach_write_to_2(log_ptr, page_offset(field));
log_ptr += 2;
mach_write_to_2(log_ptr, storage - page_zip->data);
log_ptr += 2;
memcpy(log_ptr, field, REC_NODE_PTR_SIZE);
log_ptr += REC_NODE_PTR_SIZE;
mlog_close(mtr, log_ptr);
}
}
/**************************************************************************
Write the trx_id and roll_ptr of a record on a B-tree leaf node page. */
void
page_zip_write_trx_id_and_roll_ptr(
/*===============================*/
page_zip_des_t* page_zip,/* in/out: compressed page */
byte* rec, /* in/out: record */
const ulint* offsets,/* in: rec_get_offsets(rec, index) */
ulint trx_id_col,/* in: column number of TRX_ID in rec */
dulint trx_id, /* in: transaction identifier */
dulint roll_ptr)/* in: roll_ptr */
{
byte* field;
byte* storage;
page_t* page = page_align(rec);
ulint len;
ut_ad(buf_frame_get_page_zip(rec) == page_zip);
ut_ad(page_simple_validate_new(page));
ut_ad(page_zip_simple_validate(page_zip));
ut_ad(page_zip_get_size(page_zip)
> PAGE_DATA + page_zip_dir_size(page_zip));
ut_ad(rec_offs_validate(rec, NULL, offsets));
ut_ad(rec_offs_comp(offsets));
ut_ad(page_zip->m_start >= PAGE_DATA);
ut_ad(page_zip_header_cmp(page_zip, page));
ut_ad(page_is_leaf(page));
storage = page_zip->data + page_zip_get_size(page_zip)
- (page_dir_get_n_heap(page) - PAGE_HEAP_NO_USER_LOW)
* PAGE_ZIP_DIR_SLOT_SIZE
- (rec_get_heap_no_new(rec) - 1)
* (DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN);
#if DATA_TRX_ID + 1 != DATA_ROLL_PTR
# error "DATA_TRX_ID + 1 != DATA_ROLL_PTR"
#endif
field = rec_get_nth_field(rec, offsets, trx_id_col, &len);
ut_ad(len == DATA_TRX_ID_LEN);
ut_ad(field + DATA_TRX_ID_LEN
== rec_get_nth_field(rec, offsets, trx_id_col + 1, &len));
ut_ad(len == DATA_ROLL_PTR_LEN);
#if defined UNIV_DEBUG || defined UNIV_ZIP_DEBUG
ut_a(!memcmp(storage, field, DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN));
#endif /* UNIV_DEBUG || UNIV_ZIP_DEBUG */
#if DATA_TRX_ID_LEN != 6
# error "DATA_TRX_ID_LEN != 6"
#endif
mach_write_to_6(field, trx_id);
#if DATA_ROLL_PTR_LEN != 7
# error "DATA_ROLL_PTR_LEN != 7"
#endif
mach_write_to_7(field + DATA_TRX_ID_LEN, roll_ptr);
memcpy(storage, field, DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN);
}
#ifdef UNIV_ZIP_DEBUG
/* Set this variable in a debugger to disable page_zip_clear_rec().
The only observable effect should be the compression ratio due to
deleted records not being zeroed out. In rare cases, there can be
page_zip_validate() failures on the node_ptr, trx_id and roll_ptr
columns if the space is reallocated for a smaller record. */
ibool page_zip_clear_rec_disable;
#endif /* UNIV_ZIP_DEBUG */
/**************************************************************************
Clear an area on the uncompressed and compressed page, if possible. */
static
void
page_zip_clear_rec(
/*===============*/
page_zip_des_t* page_zip,/* in/out: compressed page */
byte* rec, /* in: record to clear */
dict_index_t* index, /* in: index of rec */
const ulint* offsets)/* in: rec_get_offsets(rec, index) */
{
ulint heap_no;
page_t* page = page_align(rec);
/* page_zip_validate() would fail here if a record
containing externally stored columns is being deleted. */
ut_ad(rec_offs_validate(rec, index, offsets));
ut_ad(!page_zip_dir_find(page_zip, page_offset(rec)));
ut_ad(page_zip_dir_find_free(page_zip, page_offset(rec)));
ut_ad(page_zip_header_cmp(page_zip, page));
heap_no = rec_get_heap_no_new(rec);
ut_ad(heap_no >= PAGE_HEAP_NO_USER_LOW);
if (
#ifdef UNIV_ZIP_DEBUG
!page_zip_clear_rec_disable &&
#endif /* UNIV_ZIP_DEBUG */
page_zip->m_end
+ 1 + ((heap_no - 1) >= 64)/* size of the log entry */
+ page_zip_get_trailer_len(page_zip,
dict_index_is_clust(index), NULL)
< page_zip_get_size(page_zip)) {
byte* data;
/* Clear only the data bytes, because the allocator and
the decompressor depend on the extra bytes. */
memset(rec, 0, rec_offs_data_size(offsets));
if (!page_is_leaf(page)) {
/* Clear node_ptr on the compressed page. */
byte* storage = page_zip->data
+ page_zip_get_size(page_zip)
- (page_dir_get_n_heap(page)
- PAGE_HEAP_NO_USER_LOW)
* PAGE_ZIP_DIR_SLOT_SIZE;
memset(storage - (heap_no - 1) * REC_NODE_PTR_SIZE,
0, REC_NODE_PTR_SIZE);
} else if (dict_index_is_clust(index)) {
/* Clear trx_id and roll_ptr on the compressed page. */
byte* storage = page_zip->data
+ page_zip_get_size(page_zip)
- (page_dir_get_n_heap(page)
- PAGE_HEAP_NO_USER_LOW)
* PAGE_ZIP_DIR_SLOT_SIZE;
memset(storage - (heap_no - 1)
* (DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN),
0, DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN);
}
/* Log that the data was zeroed out. */
data = page_zip->data + page_zip->m_end;
ut_ad(!*data);
if (UNIV_UNLIKELY(heap_no - 1 >= 64)) {
*data++ = 0x80 | (heap_no - 1) >> 7;
ut_ad(!*data);
}
*data++ = (heap_no - 1) << 1 | 1;
ut_ad(!*data);
ut_ad((ulint) (data - page_zip->data)
< page_zip_get_size(page_zip));
page_zip->m_end = data - page_zip->data;
page_zip->m_nonempty = TRUE;
} else if (page_is_leaf(page) && dict_index_is_clust(index)) {
/* Do not clear the record, because there is not enough space
to log the operation. */
if (rec_offs_any_extern(offsets)) {
ulint i;
for (i = rec_offs_n_fields(offsets); i--; ) {
/* Clear all BLOB pointers in order to make
page_zip_validate() pass. */
if (rec_offs_nth_extern(offsets, i)) {
ulint len;
byte* field = rec_get_nth_field(
rec, offsets, i, &len);
memset(field + len
- BTR_EXTERN_FIELD_REF_SIZE,
0, BTR_EXTERN_FIELD_REF_SIZE);
}
}
}
}
#ifdef UNIV_ZIP_DEBUG
ut_a(page_zip_validate(page_zip, page));
#endif /* UNIV_ZIP_DEBUG */
}
/**************************************************************************
Write the "deleted" flag of a record on a compressed page. The flag must
already have been written on the uncompressed page. */
void
page_zip_rec_set_deleted(
/*=====================*/
page_zip_des_t* page_zip,/* in/out: compressed page */
const byte* rec, /* in: record on the uncompressed page */
ulint flag) /* in: the deleted flag (nonzero=TRUE) */
{
byte* slot = page_zip_dir_find(page_zip, page_offset(rec));
ut_a(slot);
if (flag) {
*slot |= (PAGE_ZIP_DIR_SLOT_DEL >> 8);
} else {
*slot &= ~(PAGE_ZIP_DIR_SLOT_DEL >> 8);
}
}
/**************************************************************************
Write the "owned" flag of a record on a compressed page. The n_owned field
must already have been written on the uncompressed page. */
void
page_zip_rec_set_owned(
/*===================*/
page_zip_des_t* page_zip,/* in/out: compressed page */
const byte* rec, /* in: record on the uncompressed page */
ulint flag) /* in: the owned flag (nonzero=TRUE) */
{
byte* slot = page_zip_dir_find(page_zip, page_offset(rec));
ut_a(slot);
if (flag) {
*slot |= (PAGE_ZIP_DIR_SLOT_OWNED >> 8);
} else {
*slot &= ~(PAGE_ZIP_DIR_SLOT_OWNED >> 8);
}
}
/**************************************************************************
Insert a record to the dense page directory. */
void
page_zip_dir_insert(
/*================*/
page_zip_des_t* page_zip,/* in/out: compressed page */
const byte* prev_rec,/* in: record after which to insert */
const byte* free_rec,/* in: record from which rec was
allocated, or NULL */
byte* rec) /* in: record to insert */
{
ulint n_dense;
byte* slot_rec;
byte* slot_free;
ut_ad(prev_rec != rec);
ut_ad(page_rec_get_next((rec_t*) prev_rec) == rec);
ut_ad(page_zip_simple_validate(page_zip));
if (page_rec_is_infimum(prev_rec)) {
/* Use the first slot. */
slot_rec = page_zip->data + page_zip_get_size(page_zip);
} else {
byte* end = page_zip->data + page_zip_get_size(page_zip);
byte* start = end - page_zip_dir_user_size(page_zip);
if (UNIV_LIKELY(!free_rec)) {
/* PAGE_N_RECS was already incremented
in page_cur_insert_rec_zip(), but the
dense directory slot at that position
contains garbage. Skip it. */
start += PAGE_ZIP_DIR_SLOT_SIZE;
}
slot_rec = page_zip_dir_find_low(start, end,
page_offset(prev_rec));
ut_a(slot_rec);
}
/* Read the old n_dense (n_heap may have been incremented). */
n_dense = page_dir_get_n_heap(page_zip->data)
- (PAGE_HEAP_NO_USER_LOW + 1);
if (UNIV_LIKELY_NULL(free_rec)) {
/* The record was allocated from the free list.
Shift the dense directory only up to that slot.
Note that in this case, n_dense is actually
off by one, because page_cur_insert_rec_zip()
did not increment n_heap. */
ut_ad(rec_get_heap_no_new(rec) < n_dense + 1
+ PAGE_HEAP_NO_USER_LOW);
ut_ad(rec >= free_rec);
slot_free = page_zip_dir_find(page_zip, page_offset(free_rec));
ut_ad(slot_free);
slot_free += PAGE_ZIP_DIR_SLOT_SIZE;
} else {
/* The record was allocated from the heap.
Shift the entire dense directory. */
ut_ad(rec_get_heap_no_new(rec) == n_dense
+ PAGE_HEAP_NO_USER_LOW);
/* Shift to the end of the dense page directory. */
slot_free = page_zip->data + page_zip_get_size(page_zip)
- PAGE_ZIP_DIR_SLOT_SIZE * n_dense;
}
/* Shift the dense directory to allocate place for rec. */
memmove(slot_free - PAGE_ZIP_DIR_SLOT_SIZE, slot_free,
slot_rec - slot_free);
/* Write the entry for the inserted record.
The "owned" and "deleted" flags must be zero. */
mach_write_to_2(slot_rec - PAGE_ZIP_DIR_SLOT_SIZE, page_offset(rec));
}
/**************************************************************************
Shift the dense page directory and the array of BLOB pointers
when a record is deleted. */
void
page_zip_dir_delete(
/*================*/
page_zip_des_t* page_zip,/* in/out: compressed page */
byte* rec, /* in: record to delete */
dict_index_t* index, /* in: index of rec */
const ulint* offsets,/* in: rec_get_offsets(rec) */
const byte* free) /* in: previous start of the free list */
{
byte* slot_rec;
byte* slot_free;
ulint n_ext;
page_t* page = page_align(rec);
ut_ad(rec_offs_validate(rec, index, offsets));
ut_ad(rec_offs_comp(offsets));
slot_rec = page_zip_dir_find(page_zip, page_offset(rec));
ut_a(slot_rec);
/* This could not be done before page_zip_dir_find(). */
page_header_set_field(page, page_zip, PAGE_N_RECS,
(ulint)(page_get_n_recs(page) - 1));
if (UNIV_UNLIKELY(!free)) {
/* Make the last slot the start of the free list. */
slot_free = page_zip->data + page_zip_get_size(page_zip)
- PAGE_ZIP_DIR_SLOT_SIZE
* (page_dir_get_n_heap(page_zip->data)
- PAGE_HEAP_NO_USER_LOW);
} else {
slot_free = page_zip_dir_find_free(page_zip,
page_offset(free));
ut_a(slot_free < slot_rec);
/* Grow the free list by one slot by moving the start. */
slot_free += PAGE_ZIP_DIR_SLOT_SIZE;
}
if (UNIV_LIKELY(slot_rec > slot_free)) {
memmove(slot_free + PAGE_ZIP_DIR_SLOT_SIZE,
slot_free,
slot_rec - slot_free);
}
/* Write the entry for the deleted record.
The "owned" and "deleted" flags will be cleared. */
mach_write_to_2(slot_free, page_offset(rec));
if (!page_is_leaf(page) || !dict_index_is_clust(index)) {
ut_ad(!rec_offs_any_extern(offsets));
goto skip_blobs;
}
n_ext = rec_offs_n_extern(offsets);
if (UNIV_UNLIKELY(n_ext)) {
/* Shift and zero fill the array of BLOB pointers. */
ulint blob_no;
byte* externs;
byte* ext_end;
blob_no = page_zip_get_n_prev_extern(page_zip, rec, index);
ut_a(blob_no + n_ext <= page_zip->n_blobs);
externs = page_zip->data + page_zip_get_size(page_zip)
- (page_dir_get_n_heap(page) - PAGE_HEAP_NO_USER_LOW)
* (PAGE_ZIP_DIR_SLOT_SIZE
+ DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN);
ext_end = externs - page_zip->n_blobs
* BTR_EXTERN_FIELD_REF_SIZE;
externs -= blob_no * BTR_EXTERN_FIELD_REF_SIZE;
page_zip->n_blobs -= n_ext;
/* Shift and zero fill the array. */
memmove(ext_end + n_ext * BTR_EXTERN_FIELD_REF_SIZE, ext_end,
(page_zip->n_blobs - blob_no)
* BTR_EXTERN_FIELD_REF_SIZE);
memset(ext_end, 0, n_ext * BTR_EXTERN_FIELD_REF_SIZE);
}
skip_blobs:
/* The compression algorithm expects info_bits and n_owned
to be 0 for deleted records. */
rec[-REC_N_NEW_EXTRA_BYTES] = 0; /* info_bits and n_owned */
page_zip_clear_rec(page_zip, rec, index, offsets);
}
/**************************************************************************
Add a slot to the dense page directory. */
void
page_zip_dir_add_slot(
/*==================*/
page_zip_des_t* page_zip, /* in/out: compressed page */
ulint is_clustered) /* in: nonzero for clustered index,
zero for others */
{
ulint n_dense;
byte* dir;
byte* stored;
ut_ad(page_is_comp(page_zip->data));
/* Read the old n_dense (n_heap has already been incremented). */
n_dense = page_dir_get_n_heap(page_zip->data)
- (PAGE_HEAP_NO_USER_LOW + 1);
dir = page_zip->data + page_zip_get_size(page_zip)
- PAGE_ZIP_DIR_SLOT_SIZE * n_dense;
if (!page_is_leaf(page_zip->data)) {
ut_ad(!page_zip->n_blobs);
stored = dir - n_dense * REC_NODE_PTR_SIZE;
} else if (UNIV_UNLIKELY(is_clustered)) {
/* Move the BLOB pointer array backwards to make space for the
roll_ptr and trx_id columns and the dense directory slot. */
byte* externs;
stored = dir - n_dense
* (DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN);
externs = stored
- page_zip->n_blobs * BTR_EXTERN_FIELD_REF_SIZE;
ut_ad(!memcmp(zero, externs
- (PAGE_ZIP_DIR_SLOT_SIZE
+ DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN),
PAGE_ZIP_DIR_SLOT_SIZE
+ DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN));
memmove(externs - (PAGE_ZIP_DIR_SLOT_SIZE
+ DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN),
externs, stored - externs);
} else {
stored = dir
- page_zip->n_blobs * BTR_EXTERN_FIELD_REF_SIZE;
ut_ad(!memcmp(zero, stored - PAGE_ZIP_DIR_SLOT_SIZE,
PAGE_ZIP_DIR_SLOT_SIZE));
}
/* Move the uncompressed area backwards to make space
for one directory slot. */
memmove(stored - PAGE_ZIP_DIR_SLOT_SIZE, stored, dir - stored);
}
/***************************************************************
Parses a log record of writing to the header of a page. */
byte*
page_zip_parse_write_header(
/*========================*/
/* out: end of log record or NULL */
byte* ptr, /* in: redo log buffer */
byte* end_ptr,/* in: redo log buffer end */
page_t* page, /* in/out: uncompressed page */
page_zip_des_t* page_zip)/* in/out: compressed page */
{
ulint offset;
ulint len;
ut_ad(ptr && end_ptr);
ut_ad(!page == !page_zip);
if (UNIV_UNLIKELY(end_ptr < ptr + (1 + 1))) {
return(NULL);
}
offset = (ulint) *ptr++;
len = (ulint) *ptr++;
if (UNIV_UNLIKELY(!len) || UNIV_UNLIKELY(offset + len >= PAGE_DATA)) {
corrupt:
recv_sys->found_corrupt_log = TRUE;
return(NULL);
}
if (UNIV_UNLIKELY(end_ptr < ptr + len)) {
return(NULL);
}
if (page) {
if (UNIV_UNLIKELY(!page_zip)) {
goto corrupt;
}
#ifdef UNIV_ZIP_DEBUG
ut_a(page_zip_validate(page_zip, page));
#endif /* UNIV_ZIP_DEBUG */
memcpy(page + offset, ptr, len);
memcpy(page_zip->data + offset, ptr, len);
#ifdef UNIV_ZIP_DEBUG
ut_a(page_zip_validate(page_zip, page));
#endif /* UNIV_ZIP_DEBUG */
}
return(ptr + len);
}
/**************************************************************************
Write a log record of writing to the uncompressed header portion of a page. */
void
page_zip_write_header_log(
/*======================*/
const byte* data, /* in: data on the uncompressed page */
ulint length, /* in: length of the data */
mtr_t* mtr) /* in: mini-transaction */
{
byte* log_ptr = mlog_open(mtr, 11 + 1 + 1);
ulint offset = page_offset(data);
ut_ad(offset < PAGE_DATA);
ut_ad(offset + length < PAGE_DATA);
#if PAGE_DATA > 255
# error "PAGE_DATA > 255"
#endif
ut_ad(length < 256);
/* If no logging is requested, we may return now */
if (UNIV_UNLIKELY(!log_ptr)) {
return;
}
log_ptr = mlog_write_initial_log_record_fast(
(byte*) data, MLOG_ZIP_WRITE_HEADER, log_ptr, mtr);
*log_ptr++ = (byte) offset;
*log_ptr++ = (byte) length;
mlog_close(mtr, log_ptr);
mlog_catenate_string(mtr, data, length);
}
/**************************************************************************
Reorganize and compress a page. This is a low-level operation for
compressed pages, to be used when page_zip_compress() fails.
On success, a redo log entry MLOG_ZIP_PAGE_COMPRESS will be written.
The function btr_page_reorganize() should be preferred whenever possible.
IMPORTANT: if page_zip_reorganize() is invoked on a leaf page of a
non-clustered index, the caller must update the insert buffer free
bits in the same mini-transaction in such a way that the modification
will be redo-logged. */
ibool
page_zip_reorganize(
/*================*/
/* out: TRUE on success, FALSE on failure;
page and page_zip will be left intact
on failure. */
buf_block_t* block, /* in/out: page with compressed page;
on the compressed page, in: size;
out: data, n_blobs,
m_start, m_end, m_nonempty */
dict_index_t* index, /* in: index of the B-tree node */
mtr_t* mtr) /* in: mini-transaction */
{
page_zip_des_t* page_zip = buf_block_get_page_zip(block);
page_t* page = buf_block_get_frame(block);
buf_block_t* temp_block;
page_t* temp_page;
ulint log_mode;
ut_ad(mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_X_FIX));
ut_ad(page_is_comp(page));
/* Note that page_zip_validate(page_zip, page) may fail here. */
/* Disable logging */
log_mode = mtr_set_log_mode(mtr, MTR_LOG_NONE);
temp_block = buf_block_alloc(0);
temp_page = temp_block->frame;
/* Copy the old page to temporary space */
buf_frame_copy(temp_page, page);
/* Recreate the page: note that global data on page (possible
segment headers, next page-field, etc.) is preserved intact */
page_create(block, mtr, dict_table_is_comp(index->table));
block->check_index_page_at_flush = TRUE;
/* Copy the records from the temporary space to the recreated page;
do not copy the lock bits yet */
page_copy_rec_list_end_no_locks(block, temp_block,
page_get_infimum_rec(temp_page),
index, mtr);
/* Copy max trx id to recreated page */
page_set_max_trx_id(block, NULL, page_get_max_trx_id(temp_page));
/* Restore logging. */
mtr_set_log_mode(mtr, log_mode);
if (UNIV_UNLIKELY(!page_zip_compress(page_zip, page, index, mtr))) {
/* Restore the old page and exit. */
buf_frame_copy(page, temp_page);
buf_block_free(temp_block);
return(FALSE);
}
lock_move_reorganize_page(block, temp_block);
btr_search_drop_page_hash_index(block);
buf_block_free(temp_block);
return(TRUE);
}
/**************************************************************************
Copy a page byte for byte, except for the file page header and trailer. */
void
page_zip_copy(
/*==========*/
page_zip_des_t* page_zip, /* out: copy of src_zip
(n_blobs, m_start, m_end,
m_nonempty, data[0..size-1]) */
page_t* page, /* out: copy of src */
const page_zip_des_t* src_zip, /* in: compressed page */
const page_t* src, /* in: page */
dict_index_t* index, /* in: index of the B-tree */
mtr_t* mtr) /* in: mini-transaction */
{
ut_ad(mtr_memo_contains_page(mtr, page, MTR_MEMO_PAGE_X_FIX));
ut_ad(mtr_memo_contains_page(mtr, (page_t*) src, MTR_MEMO_PAGE_X_FIX));
#ifdef UNIV_ZIP_DEBUG
ut_a(page_zip_validate(src_zip, src));
#endif /* UNIV_ZIP_DEBUG */
ut_a(page_zip_get_size(page_zip) == page_zip_get_size(src_zip));
if (UNIV_UNLIKELY(src_zip->n_blobs)) {
ut_a(page_is_leaf(src));
ut_a(dict_index_is_clust(index));
}
/* Skip the file page header and trailer. */
memcpy(page + FIL_PAGE_DATA, src + FIL_PAGE_DATA,
UNIV_PAGE_SIZE - FIL_PAGE_DATA
- FIL_PAGE_DATA_END);
memcpy(page_zip->data + FIL_PAGE_DATA,
src_zip->data + FIL_PAGE_DATA,
page_zip_get_size(page_zip) - FIL_PAGE_DATA);
{
page_zip_t* data = page_zip->data;
memcpy(page_zip, src_zip, sizeof *page_zip);
page_zip->data = data;
}
ut_ad(page_zip_get_trailer_len(page_zip,
dict_index_is_clust(index), NULL)
+ page_zip->m_end < page_zip_get_size(page_zip));
if (!page_is_leaf(src)
&& UNIV_UNLIKELY(mach_read_from_4(src + FIL_PAGE_PREV) == FIL_NULL)
&& UNIV_LIKELY(mach_read_from_4(page
+ FIL_PAGE_PREV) != FIL_NULL)) {
/* Clear the REC_INFO_MIN_REC_FLAG of the first user record. */
ulint offs = rec_get_next_offs(page + PAGE_NEW_INFIMUM,
TRUE);
if (UNIV_LIKELY(offs != PAGE_NEW_SUPREMUM)) {
rec_t* rec = page + offs;
ut_a(rec[-REC_N_NEW_EXTRA_BYTES]
& REC_INFO_MIN_REC_FLAG);
rec[-REC_N_NEW_EXTRA_BYTES] &= ~ REC_INFO_MIN_REC_FLAG;
}
}
#ifdef UNIV_ZIP_DEBUG
ut_a(page_zip_validate(page_zip, page));
#endif /* UNIV_ZIP_DEBUG */
page_zip_compress_write_log(page_zip, page, index, mtr);
}
/**************************************************************************
Parses a log record of compressing an index page. */
byte*
page_zip_parse_compress(
/*====================*/
/* out: end of log record or NULL */
byte* ptr, /* in: buffer */
byte* end_ptr,/* in: buffer end */
page_t* page, /* out: uncompressed page */
page_zip_des_t* page_zip)/* out: compressed page */
{
ulint size;
ulint trailer_size;
ut_ad(ptr && end_ptr);
ut_ad(!page == !page_zip);
if (UNIV_UNLIKELY(ptr + (2 + 2) > end_ptr)) {
return(NULL);
}
size = mach_read_from_2(ptr);
ptr += 2;
trailer_size = mach_read_from_2(ptr);
ptr += 2;
if (UNIV_UNLIKELY(ptr + 8 + size + trailer_size > end_ptr)) {
return(NULL);
}
if (page) {
if (UNIV_UNLIKELY(!page_zip)
|| UNIV_UNLIKELY(page_zip_get_size(page_zip) < size)) {
corrupt:
recv_sys->found_corrupt_log = TRUE;
return(NULL);
}
memcpy(page_zip->data + FIL_PAGE_PREV, ptr, 4);
memcpy(page_zip->data + FIL_PAGE_NEXT, ptr + 4, 4);
memcpy(page_zip->data + FIL_PAGE_TYPE, ptr + 8, size);
memset(page_zip->data + FIL_PAGE_TYPE + size, 0,
page_zip_get_size(page_zip) - trailer_size
- (FIL_PAGE_TYPE + size));
memcpy(page_zip->data + page_zip_get_size(page_zip)
- trailer_size, ptr + 8 + size, trailer_size);
if (UNIV_UNLIKELY(!page_zip_decompress(page_zip, page))) {
goto corrupt;
}
}
return(ptr + 8 + size + trailer_size);
}
/**************************************************************************
Calculate the compressed page checksum. */
ulint
page_zip_calc_checksum(
/*===================*/
/* out: page checksum */
const void* data, /* in: compressed page */
ulint size) /* in: size of compressed page */
{
/* Exclude FIL_PAGE_SPACE_OR_CHKSUM, FIL_PAGE_LSN,
and FIL_PAGE_FILE_FLUSH_LSN from the checksum. */
const Bytef* s = data;
uLong adler;
ut_ad(size > FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID);
adler = adler32(0L, s + FIL_PAGE_OFFSET,
FIL_PAGE_LSN - FIL_PAGE_OFFSET);
adler = adler32(adler, s + FIL_PAGE_TYPE, 2);
adler = adler32(adler, s + FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID,
size - FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID);
return((ulint) adler);
}
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