/*
* cursor_open () -
* return: true on all ok, false otherwise
* cursor_id(out): Cursor identifier
* list_id: List file identifier
* updatable: Flag which indicates if cursor is updatable
* is_oid_included: Flag which indicates if first column of the list file
* contains hidden object identifiers
*
* Note: A cursor is opened to scan through the tuples of the given
* list file. The cursor identifier is initialized and memory
* buffer for the cursor identifier is allocated. If is_oid_included
* flag is set to true, this indicates that the first column
* of list file tuples contains the object identifier to be used
* for cursor update/delete operations.
*/
bool
cursor_open (CURSOR_ID * cursor_id_p, QFILE_LIST_ID * list_id_p,
bool updatable, bool is_oid_included)
{
static QFILE_LIST_ID empty_list_id; /* TODO: remove static empty_list_id */
QFILE_CLEAR_LIST_ID (&empty_list_id);
cursor_id_p->is_updatable = updatable;
cursor_id_p->is_oid_included = is_oid_included;
cursor_id_p->oid_ent_count = 0;
cursor_id_p->oid_set = NULL;
cursor_id_p->mop_set = NULL;
cursor_id_p->position = C_BEFORE;
cursor_id_p->tuple_no = -1;
VPID_SET_NULL (&cursor_id_p->current_vpid);
VPID_SET_NULL (&cursor_id_p->next_vpid);
VPID_SET_NULL (&cursor_id_p->header_vpid);
cursor_id_p->tuple_record.size = 0;
cursor_id_p->tuple_record.tpl = NULL;
cursor_id_p->on_overflow = false;
cursor_id_p->buffer_tuple_count = 0;
cursor_id_p->current_tuple_no = -1;
cursor_id_p->current_tuple_offset = -1;
cursor_id_p->current_tuple_p = NULL;
cursor_id_p->current_tuple_length = -1;
cursor_id_p->oid_col_no = NULL;
cursor_id_p->oid_col_no_cnt = 0;
cursor_id_p->buffer = NULL;
cursor_id_p->buffer_area = NULL;
cursor_id_p->buffer_filled_size = 0;
cursor_id_p->list_id = empty_list_id;
cursor_id_p->prefetch_lock_mode = DB_FETCH_READ;
cursor_id_p->is_copy_tuple_value = true; /* copy */
cursor_initialize_current_tuple_value_position (cursor_id_p);
if (cursor_copy_list_id (&cursor_id_p->list_id, list_id_p) != NO_ERROR)
{
return false;
}
if (cursor_id_p->list_id.type_list.type_cnt)
{
cursor_id_p->buffer_area = (char *) malloc (CURSOR_BUFFER_AREA_SIZE);
cursor_id_p->buffer = cursor_id_p->buffer_area;
if (cursor_id_p->buffer == NULL)
{
return false;
}
if (is_oid_included)
{
cursor_allocate_oid_buffer (cursor_id_p);
}
}
return true;
}
/*
* overflow_rv_newpage_link_undo () - Undo allocation of new overflow page and the
* reference to it
* return: 0 if no error, or error code
* rcv(in): Recovery structure
*/
int
overflow_rv_newpage_link_undo (THREAD_ENTRY * thread_p, LOG_RCV * rcv)
{
OVERFLOW_REST_PART *rest_parts;
rest_parts = (OVERFLOW_REST_PART *) rcv->pgptr;
VPID_SET_NULL (&rest_parts->next_vpid);
pgbuf_set_dirty (thread_p, rcv->pgptr, DONT_FREE);
return NO_ERROR;
}
/*
* overflow_update () - Update the content of a multipage data
* return: ovf_vpid on success or NULL on failure
* ovf_vfid(in): File where the overflow data is stored
* WARNING: MUST BE THE SAME AS IT WAS GIVEN DURING INSERT
* ovf_vpid(in): Overflow address
* recdes(in): Record descriptor
*
* Note: The function may allocate or deallocate several overflow pages if
* the multipage data increase/decrease in length.
*
* Overflow pages are not locked in any mode since they are not shared
* by other data and its address is know by accessing the relocation
* overflow record which has been appropriately locked.
*/
const VPID *
overflow_update (THREAD_ENTRY * thread_p, const VFID * ovf_vfid,
const VPID * ovf_vpid, RECDES * recdes)
{
OVERFLOW_FIRST_PART *first_part = NULL;
OVERFLOW_REST_PART *rest_parts = NULL;
char *copyto;
OVERFLOW_RECV_LINKS recv;
VPID tmp_vpid;
int hdr_length;
int copy_length;
int old_length = 0;
int length;
char *data;
VPID next_vpid;
VPID *addr_vpid_ptr;
LOG_DATA_ADDR addr;
LOG_DATA_ADDR logical_undoaddr;
bool isnewpage = false;
/*
* We don't need to lock the overflow pages since these pages are not
* shared among several pieces of overflow data. The overflow pages are
* know by accessing the relocation-overflow record with the appropiate lock
*/
addr.vfid = ovf_vfid;
addr.offset = 0;
logical_undoaddr.vfid = ovf_vfid;
logical_undoaddr.offset = 0;
logical_undoaddr.pgptr = NULL;
recv.ovf_vfid = *ovf_vfid;
next_vpid = *ovf_vpid;
data = recdes->data;
length = recdes->length;
while (length > 0)
{
addr.pgptr = pgbuf_fix (thread_p, &next_vpid, OLD_PAGE,
PGBUF_LATCH_WRITE, PGBUF_UNCONDITIONAL_LATCH);
if (addr.pgptr == NULL)
{
goto exit_on_error;
}
addr_vpid_ptr = pgbuf_get_vpid_ptr (addr.pgptr);
/* Log before and after images */
/* Is this the first page ? */
if (VPID_EQ (addr_vpid_ptr, ovf_vpid))
{
/* This is the first part */
first_part = (OVERFLOW_FIRST_PART *) addr.pgptr;
old_length = first_part->length;
copyto = (char *) first_part->data;
next_vpid = first_part->next_vpid;
hdr_length = offsetof (OVERFLOW_FIRST_PART, data);
if ((length + hdr_length) > DB_PAGESIZE)
{
copy_length = DB_PAGESIZE - hdr_length;
}
else
{
copy_length = length;
}
/* Log before image */
if (hdr_length + old_length > DB_PAGESIZE)
{
log_append_undo_data (thread_p, RVOVF_PAGE_UPDATE, &addr,
DB_PAGESIZE, addr.pgptr);
old_length -= DB_PAGESIZE - hdr_length;
}
else
{
log_append_undo_data (thread_p, RVOVF_PAGE_UPDATE, &addr,
hdr_length + old_length, addr.pgptr);
old_length = 0;
}
/* Modify the new length */
first_part->length = length;
/* notify the first part of overflow recdes */
log_append_empty_record (thread_p, LOG_DUMMY_OVF_RECORD);
}
else
{
rest_parts = (OVERFLOW_REST_PART *) addr.pgptr;
copyto = (char *) rest_parts->data;
if (isnewpage == true)
{
VPID_SET_NULL (&next_vpid);
rest_parts->next_vpid = next_vpid;
}
else
{
next_vpid = rest_parts->next_vpid;
}
hdr_length = offsetof (OVERFLOW_REST_PART, data);
if ((length + hdr_length) > DB_PAGESIZE)
{
copy_length = DB_PAGESIZE - hdr_length;
}
else
{
copy_length = length;
}
if (old_length > 0)
{
if (hdr_length + old_length > DB_PAGESIZE)
{
log_append_undo_data (thread_p, RVOVF_PAGE_UPDATE, &addr,
DB_PAGESIZE, addr.pgptr);
old_length -= DB_PAGESIZE - hdr_length;
}
else
{
log_append_undo_data (thread_p, RVOVF_PAGE_UPDATE, &addr,
hdr_length + old_length, addr.pgptr);
old_length = 0;
}
}
}
memcpy (copyto, data, copy_length);
data += copy_length;
length -= copy_length;
log_append_redo_data (thread_p, RVOVF_PAGE_UPDATE, &addr,
copy_length + hdr_length, (char *) addr.pgptr);
if (length > 0)
{
/* Need more pages... Get next page */
if (VPID_ISNULL (&next_vpid))
{
/* We need to allocate a new page */
if (file_alloc_pages (thread_p, ovf_vfid, &next_vpid, 1,
addr_vpid_ptr, NULL, NULL) == NULL)
{
pgbuf_set_dirty (thread_p, addr.pgptr, FREE);
addr.pgptr = NULL;
goto exit_on_error;
}
recv.new_vpid = next_vpid;
log_append_undoredo_data (thread_p, RVOVF_NEWPAGE_LINK, &addr,
sizeof (recv), sizeof (next_vpid),
&recv, &next_vpid);
isnewpage = true; /* So that its link can be set to NULL */
/* This logical undo is to remove the page in case of rollback */
if (file_is_new_file (thread_p, ovf_vfid) == FILE_OLD_FILE)
{
/* we don't do undo logging for new files */
log_append_undo_data (thread_p, RVOVF_NEWPAGE_LOGICAL_UNDO,
&logical_undoaddr, sizeof (recv),
&recv);
}
if (rest_parts == NULL)
{
/* This is the first part */
first_part->next_vpid = next_vpid;
}
else
{
/* This is part of rest part */
rest_parts->next_vpid = next_vpid;
}
}
pgbuf_set_dirty (thread_p, addr.pgptr, FREE);
addr.pgptr = NULL;
}
else
{
/* The content of the data has been copied. We don't need more pages.
Deallocate any additional pages */
VPID_SET_NULL (&tmp_vpid);
log_append_undoredo_data (thread_p, RVOVF_CHANGE_LINK, &addr,
sizeof (next_vpid), sizeof (next_vpid),
&next_vpid, &tmp_vpid);
if (rest_parts == NULL)
{
/* This is the first part */
VPID_SET_NULL (&first_part->next_vpid);
}
else
{
/* This is part of rest part */
VPID_SET_NULL (&rest_parts->next_vpid);
}
pgbuf_set_dirty (thread_p, addr.pgptr, FREE);
addr.pgptr = NULL;
while (!(VPID_ISNULL (&next_vpid)))
{
addr.pgptr = pgbuf_fix (thread_p, &next_vpid, OLD_PAGE,
PGBUF_LATCH_WRITE,
PGBUF_UNCONDITIONAL_LATCH);
if (addr.pgptr == NULL)
{
goto exit_on_error;
}
tmp_vpid = next_vpid;
rest_parts = (OVERFLOW_REST_PART *) addr.pgptr;
next_vpid = rest_parts->next_vpid;
if (pgbuf_invalidate (thread_p, addr.pgptr) != NO_ERROR)
{
goto exit_on_error;
}
addr.pgptr = NULL;
if (file_dealloc_page (thread_p, ovf_vfid, &tmp_vpid) !=
NO_ERROR)
{
goto exit_on_error;
}
}
break;
}
}
return ovf_vpid;
exit_on_error:
return NULL;
}
/*
* overflow_insert () - Insert a multipage data in overflow
* return: ovf_vpid on success or NULL on failure
* ovf_vfid(in): File where the overflow data is going to be stored
* ovf_vpid(out): Overflow address
* recdes(in): Record descriptor
*
* Note: Data in overflow is composed of several pages. Pages in the overflow
* area are not shared among other pieces of overflow data.
*
* -------------------------------- ------------------------
* |Next_vpid |Length|... data ...| ... --> |Next_vpid|... data ...|
* -------------------------------- ------------------------
*
* Single link list of pages.
* The length of the multipage data is stored on its first overflow page
*
* Overflow pages are not locked in any mode since they are not shared
* by other pieces of data and its address is only know by accessing the
* relocation overflow record data which has been appropriately locked.
*/
VPID *
overflow_insert (THREAD_ENTRY * thread_p, const VFID * ovf_vfid,
VPID * ovf_vpid, RECDES * recdes)
{
PAGE_PTR vfid_fhdr_pgptr = NULL;
OVERFLOW_FIRST_PART *first_part;
OVERFLOW_REST_PART *rest_parts;
OVERFLOW_RECV_LINKS undo_recv;
char *copyto;
int length, copy_length;
INT32 npages = 0;
char *data;
int alloc_nth;
LOG_DATA_ADDR addr;
LOG_DATA_ADDR logical_undoaddr;
int i;
VPID *vpids, fhdr_vpid;
VPID vpids_buffer[OVERFLOW_ALLOCVPID_ARRAY_SIZE + 1];
FILE_ALLOC_VPIDS alloc_vpids;
/*
* We don't need to lock the overflow pages since these pages are not
* shared among several pieces of overflow data. The overflow pages are
* know by accessing the relocation-overflow record with the appropiate lock
*/
addr.vfid = ovf_vfid;
addr.offset = 0;
logical_undoaddr.vfid = ovf_vfid;
logical_undoaddr.offset = 0;
logical_undoaddr.pgptr = NULL;
undo_recv.ovf_vfid = *ovf_vfid;
/*
* Temporary:
* Lock the file header, so I am the only one changing the file table
* of allocated pages. This is needed since this function is using
* file_find_nthpages, which could give me not the expected page, if someone
* else remove pages, after the initial allocation.
*/
fhdr_vpid.volid = ovf_vfid->volid;
fhdr_vpid.pageid = ovf_vfid->fileid;
vfid_fhdr_pgptr = pgbuf_fix (thread_p, &fhdr_vpid, OLD_PAGE,
PGBUF_LATCH_WRITE, PGBUF_UNCONDITIONAL_LATCH);
if (vfid_fhdr_pgptr == NULL)
{
return NULL;
}
/*
* Guess the number of pages. The total number of pages is found by
* dividing length by pagesize - the smallest header. Then, we make sure
* that this estimate is correct.
*/
length = recdes->length - (DB_PAGESIZE -
(int) offsetof (OVERFLOW_FIRST_PART, data));
if (length > 0)
{
i = DB_PAGESIZE - offsetof (OVERFLOW_REST_PART, data);
npages = 1 + CEIL_PTVDIV (length, i);
}
else
{
npages = 1;
}
if (npages > OVERFLOW_ALLOCVPID_ARRAY_SIZE)
{
vpids = (VPID *) malloc ((npages + 1) * sizeof (VPID));
if (vpids == NULL)
{
er_set (ER_ERROR_SEVERITY, ARG_FILE_LINE, ER_OUT_OF_VIRTUAL_MEMORY,
1, (npages + 1) * sizeof (VPID));
pgbuf_unfix (thread_p, vfid_fhdr_pgptr);
return NULL;
}
}
else
{
vpids = vpids_buffer;
}
#if !defined(NDEBUG)
for (i = 0; i < npages; i++)
{
VPID_SET_NULL (&vpids[i]);
}
#endif
VPID_SET_NULL (&vpids[npages]);
alloc_vpids.vpids = vpids;
alloc_vpids.index = 0;
/*
* We do not initialize the pages during allocation since they are not
* pointed by anyone until we return from this function, at that point
* they are initialized.
*/
if (file_alloc_pages_as_noncontiguous (thread_p, ovf_vfid, vpids,
&alloc_nth, npages, NULL, NULL,
NULL, &alloc_vpids) == NULL)
{
if (vpids != vpids_buffer)
{
free_and_init (vpids);
}
pgbuf_unfix (thread_p, vfid_fhdr_pgptr);
return NULL;
}
assert (alloc_vpids.index == npages);
#if !defined(NDEBUG)
for (i = 0; i < npages; i++)
{
assert (!VPID_ISNULL (&vpids[i]));
}
#endif
*ovf_vpid = vpids[0];
/* Copy the content of the data */
data = recdes->data;
length = recdes->length;
for (i = 0; i < npages; i++)
{
addr.pgptr = pgbuf_fix (thread_p, &vpids[i], NEW_PAGE,
PGBUF_LATCH_WRITE, PGBUF_UNCONDITIONAL_LATCH);
if (addr.pgptr == NULL)
{
goto exit_on_error;
}
/* Is this the first page ? */
if (i == 0)
{
/* This is the first part */
first_part = (OVERFLOW_FIRST_PART *) addr.pgptr;
first_part->next_vpid = vpids[i + 1];
first_part->length = length;
copyto = (char *) first_part->data;
copy_length = DB_PAGESIZE - offsetof (OVERFLOW_FIRST_PART, data);
if (length < copy_length)
{
copy_length = length;
}
/* notify the first part of overflow recdes */
log_append_empty_record (thread_p, LOG_DUMMY_OVF_RECORD);
}
else
{
rest_parts = (OVERFLOW_REST_PART *) addr.pgptr;
rest_parts->next_vpid = vpids[i + 1];
copyto = (char *) rest_parts->data;
copy_length = DB_PAGESIZE - offsetof (OVERFLOW_REST_PART, data);
if (length < copy_length)
{
copy_length = length;
}
}
memcpy (copyto, data, copy_length);
data += copy_length;
length -= copy_length;
pgbuf_get_vpid (addr.pgptr, &undo_recv.new_vpid);
if (file_is_new_file (thread_p, ovf_vfid) == FILE_OLD_FILE)
{
/* we don't do undo logging for new files */
log_append_undo_data (thread_p, RVOVF_NEWPAGE_LOGICAL_UNDO,
&logical_undoaddr, sizeof (undo_recv),
&undo_recv);
}
log_append_redo_data (thread_p, RVOVF_NEWPAGE_INSERT, &addr,
copy_length +
CAST_BUFLEN (copyto - (char *) addr.pgptr),
(char *) addr.pgptr);
pgbuf_set_dirty (thread_p, addr.pgptr, FREE);
addr.pgptr = NULL;
}
assert (length == 0);
#if defined (CUBRID_DEBUG)
if (length > 0)
{
er_log_debug (ARG_FILE_LINE, "ovf_insert: ** SYSTEM ERROR calculation"
" of number of pages needed to store overflow data seems"
" incorrect. Need no more than %d pages", npages);
goto exit_on_error;
}
#endif
/*
* Temporary:
* Unlock the file header, so I am the only one changing the file table
* of allocated pages. This is needed since curently, I am using
* file_find_nthpages, which could give me not the expected page, if someone
* else remove pages.
*/
if (vpids != vpids_buffer)
{
free_and_init (vpids);
}
pgbuf_unfix (thread_p, vfid_fhdr_pgptr);
return ovf_vpid;
exit_on_error:
for (i = 0; i < npages; i++)
{
(void) file_dealloc_page (thread_p, ovf_vfid, &vpids[i]);
}
if (vpids != vpids_buffer)
{
free_and_init (vpids);
}
pgbuf_unfix (thread_p, vfid_fhdr_pgptr);
return NULL;
}
