dm.c (b2abdb1b4b9eaffc4f41aa466ce77c2d91bb23df) dm.c (0cede372ce6a8adf4d4d28fe7edd2aa913804595)
1/*
2 * Copyright (C) 2001, 2002 Sistina Software (UK) Limited.
3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
4 *
5 * This file is released under the GPL.
6 */
7
8#include "dm-core.h"

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2513 dm_table_presuspend_undo_targets(map);
2514 return r;
2515 }
2516 }
2517
2518 /*
2519 * Here we must make sure that no processes are submitting requests
2520 * to target drivers i.e. no one may be executing
1/*
2 * Copyright (C) 2001, 2002 Sistina Software (UK) Limited.
3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
4 *
5 * This file is released under the GPL.
6 */
7
8#include "dm-core.h"

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2513 dm_table_presuspend_undo_targets(map);
2514 return r;
2515 }
2516 }
2517
2518 /*
2519 * Here we must make sure that no processes are submitting requests
2520 * to target drivers i.e. no one may be executing
2521 * __split_and_process_bio. This is called from dm_request and
2522 * dm_wq_work.
2521 * __split_and_process_bio from dm_submit_bio.
2523 *
2522 *
2524 * To get all processes out of __split_and_process_bio in dm_request,
2523 * To get all processes out of __split_and_process_bio in dm_submit_bio,
2525 * we take the write lock. To prevent any process from reentering
2524 * we take the write lock. To prevent any process from reentering
2526 * __split_and_process_bio from dm_request and quiesce the thread
2527 * (dm_wq_work), we set BMF_BLOCK_IO_FOR_SUSPEND and call
2525 * __split_and_process_bio from dm_submit_bio and quiesce the thread
2526 * (dm_wq_work), we set DMF_BLOCK_IO_FOR_SUSPEND and call
2528 * flush_workqueue(md->wq).
2529 */
2530 set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags);
2531 if (map)
2532 synchronize_srcu(&md->io_barrier);
2533
2534 /*
2535 * Stop md->queue before flushing md->wq in case request-based

--- 634 unchanged lines hidden --- 		2527 * flush_workqueue(md->wq).
2528 */
2529 set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags);
2530 if (map)
2531 synchronize_srcu(&md->io_barrier);
2532
2533 /*
2534 * Stop md->queue before flushing md->wq in case request-based

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