dm.c (44cc6c08da0b6c8321c6740bbb6a0c6feb45b2c2) dm.c (2a708cff93f1845b9239bc7d6310aef54e716c6a)
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.h"

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2832
2833static void __dm_destroy(struct mapped_device *md, bool wait)
2834{
2835 struct dm_table *map;
2836 int srcu_idx;
2837
2838 might_sleep();
2839
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.h"

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2832
2833static void __dm_destroy(struct mapped_device *md, bool wait)
2834{
2835 struct dm_table *map;
2836 int srcu_idx;
2837
2838 might_sleep();
2839
2840 map = dm_get_live_table(md, &srcu_idx);
2841
2842 spin_lock(&_minor_lock);
2843 idr_replace(&_minor_idr, MINOR_ALLOCED, MINOR(disk_devt(dm_disk(md))));
2844 set_bit(DMF_FREEING, &md->flags);
2845 spin_unlock(&_minor_lock);
2846
2847 if (dm_request_based(md) && md->kworker_task)
2848 flush_kthread_worker(&md->kworker);
2849
2850 /*
2851 * Take suspend_lock so that presuspend and postsuspend methods
2852 * do not race with internal suspend.
2853 */
2854 mutex_lock(&md->suspend_lock);
2840 spin_lock(&_minor_lock);
2841 idr_replace(&_minor_idr, MINOR_ALLOCED, MINOR(disk_devt(dm_disk(md))));
2842 set_bit(DMF_FREEING, &md->flags);
2843 spin_unlock(&_minor_lock);
2844
2845 if (dm_request_based(md) && md->kworker_task)
2846 flush_kthread_worker(&md->kworker);
2847
2848 /*
2849 * Take suspend_lock so that presuspend and postsuspend methods
2850 * do not race with internal suspend.
2851 */
2852 mutex_lock(&md->suspend_lock);
2853 map = dm_get_live_table(md, &srcu_idx);
2855 if (!dm_suspended_md(md)) {
2856 dm_table_presuspend_targets(map);
2857 dm_table_postsuspend_targets(map);
2858 }
2854 if (!dm_suspended_md(md)) {
2855 dm_table_presuspend_targets(map);
2856 dm_table_postsuspend_targets(map);
2857 }
2859 mutex_unlock(&md->suspend_lock);
2860
2861 /* dm_put_live_table must be before msleep, otherwise deadlock is possible */
2862 dm_put_live_table(md, srcu_idx);
2858 /* dm_put_live_table must be before msleep, otherwise deadlock is possible */
2859 dm_put_live_table(md, srcu_idx);
2860 mutex_unlock(&md->suspend_lock);
2863
2864 /*
2865 * Rare, but there may be I/O requests still going to complete,
2866 * for example. Wait for all references to disappear.
2867 * No one should increment the reference count of the mapped_device,
2868 * after the mapped_device state becomes DMF_FREEING.
2869 */
2870 if (wait)

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2862 /*
2863 * Rare, but there may be I/O requests still going to complete,
2864 * for example. Wait for all references to disappear.
2865 * No one should increment the reference count of the mapped_device,
2866 * after the mapped_device state becomes DMF_FREEING.
2867 */
2868 if (wait)

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