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/* Copyright (C) 2006 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include "maria_def.h"
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Assign pages of the index file for a table to a key cache
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maria_assign_to_pagecache()
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key_map map of indexes to assign to the key cache
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pagecache_ptr pointer to the key cache handle
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assign_lock Mutex to lock during assignment
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One must have a READ lock or a WRITE lock on the table when calling
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the function to ensure that there is no other writers to it.
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The caller must also ensure that one doesn't call this function from
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two different threads with the same table.
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At present pages for all indexes must be assigned to the same key cache.
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In future only pages for indexes specified in the key_map parameter
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of the table will be assigned to the specified key cache.
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int maria_assign_to_pagecache(MARIA_HA *info,
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ulonglong key_map __attribute__((unused)),
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MARIA_SHARE* share= info->s;
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DBUG_ENTER("maria_assign_to_pagecache");
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("old_pagecache_handle: 0x%lx new_pagecache_handle: 0x%lx",
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(long) share->pagecache, (long) pagecache));
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Skip operation if we didn't change key cache. This can happen if we
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call this for all open instances of the same table
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if (share->pagecache == pagecache)
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First flush all blocks for the table in the old key cache.
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This is to ensure that the disk is consistent with the data pages
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in memory (which may not be the case if the table uses delayed_key_write)
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Note that some other read thread may still fill in the key cache with
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new blocks during this call and after, but this doesn't matter as
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all threads will start using the new key cache for their next call to
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maria library and we know that there will not be any changed blocks
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if (flush_pagecache_blocks(share->pagecache, &share->kfile, FLUSH_RELEASE))
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maria_print_error(info->s, HA_ERR_CRASHED);
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maria_mark_crashed(info); /* Mark that table must be checked */
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Flush the new key cache for this file. This is needed to ensure
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that there is no old blocks (with outdated data) left in the new key
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cache from an earlier assign_to_keycache operation
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(This can never fail as there is never any not written data in the
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(void) flush_pagecache_blocks(pagecache, &share->kfile, FLUSH_RELEASE);
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ensure that setting the key cache and changing the multi_pagecache
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pthread_mutex_lock(&share->intern_lock);
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Tell all threads to use the new key cache
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This should be seen at the lastes for the next call to an maria function.
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share->pagecache= pagecache;
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/* store the key cache in the global hash structure for future opens */
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if (multi_pagecache_set((uchar*) share->unique_file_name,
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share->unique_name_length,
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pthread_mutex_unlock(&share->intern_lock);
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Change all MARIA entries that uses one key cache to another key cache
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maria_change_pagecache()
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old_pagecache Old key cache
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new_pagecache New key cache
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This is used when we delete one key cache.
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To handle the case where some other threads tries to open an MARIA
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table associated with the to-be-deleted key cache while this operation
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is running, we have to call 'multi_pagecache_change()' from this
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function while we have a lock on the MARIA table list structure.
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This is safe as long as it's only MARIA that is using this specific
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void maria_change_pagecache(PAGECACHE *old_pagecache,
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PAGECACHE *new_pagecache)
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DBUG_ENTER("maria_change_pagecache");
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Lock list to ensure that no one can close the table while we manipulate it
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pthread_mutex_lock(&THR_LOCK_maria);
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for (pos=maria_open_list ; pos ; pos=pos->next)
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MARIA_HA *info= (MARIA_HA*) pos->data;
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MARIA_SHARE *share= info->s;
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if (share->pagecache == old_pagecache)
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maria_assign_to_pagecache(info, (ulonglong) ~0, new_pagecache);
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We have to do the following call while we have the lock on the
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MARIA list structure to ensure that another thread is not trying to
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open a new table that will be associted with the old key cache
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multi_pagecache_change(old_pagecache, new_pagecache);
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pthread_mutex_unlock(&THR_LOCK_maria);