dm.c (fe6e91e3387e4f90ed4605a1a538248a31686c16) dm.c (96b26c8c64c7a30488b8b404f7a63346df4c3bff)
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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201 struct hd_geometry geometry;
202
203 /* kobject and completion */
204 struct dm_kobject_holder kobj_holder;
205
206 /* zero-length flush that will be cloned and submitted to targets */
207 struct bio flush_bio;
208
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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201 struct hd_geometry geometry;
202
203 /* kobject and completion */
204 struct dm_kobject_holder kobj_holder;
205
206 /* zero-length flush that will be cloned and submitted to targets */
207 struct bio flush_bio;
208
209 /* the number of internal suspends */
210 unsigned internal_suspend_count;
211
209 struct dm_stats stats;
210};
211
212/*
213 * For mempools pre-allocation at the table loading time.
214 */
215struct dm_md_mempools {
216 mempool_t *io_pool;

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2923 * until all bios finish and prevents issuing new bios to the target drivers.
2924 * It may be used only from the kernel.
2925 */
2926
2927static void __dm_internal_suspend(struct mapped_device *md, unsigned suspend_flags)
2928{
2929 struct dm_table *map = NULL;
2930
212 struct dm_stats stats;
213};
214
215/*
216 * For mempools pre-allocation at the table loading time.
217 */
218struct dm_md_mempools {
219 mempool_t *io_pool;

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2926 * until all bios finish and prevents issuing new bios to the target drivers.
2927 * It may be used only from the kernel.
2928 */
2929
2930static void __dm_internal_suspend(struct mapped_device *md, unsigned suspend_flags)
2931{
2932 struct dm_table *map = NULL;
2933
2931 if (dm_suspended_internally_md(md))
2934 if (md->internal_suspend_count++)
2932 return; /* nested internal suspend */
2933
2934 if (dm_suspended_md(md)) {
2935 set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags);
2936 return; /* nest suspend */
2937 }
2938
2939 map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock));

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2948
2949 set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags);
2950
2951 dm_table_postsuspend_targets(map);
2952}
2953
2954static void __dm_internal_resume(struct mapped_device *md)
2955{
2935 return; /* nested internal suspend */
2936
2937 if (dm_suspended_md(md)) {
2938 set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags);
2939 return; /* nest suspend */
2940 }
2941
2942 map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock));

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2951
2952 set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags);
2953
2954 dm_table_postsuspend_targets(map);
2955}
2956
2957static void __dm_internal_resume(struct mapped_device *md)
2958{
2956 if (!dm_suspended_internally_md(md))
2959 BUG_ON(!md->internal_suspend_count);
2960
2961 if (--md->internal_suspend_count)
2957 return; /* resume from nested internal suspend */
2958
2959 if (dm_suspended_md(md))
2960 goto done; /* resume from nested suspend */
2961
2962 /*
2963 * NOTE: existing callers don't need to call dm_table_resume_targets
2964 * (which may fail -- so best to avoid it for now by passing NULL map)

--- 234 unchanged lines hidden --- 		2962 return; /* resume from nested internal suspend */
2963
2964 if (dm_suspended_md(md))
2965 goto done; /* resume from nested suspend */
2966
2967 /*
2968 * NOTE: existing callers don't need to call dm_table_resume_targets
2969 * (which may fail -- so best to avoid it for now by passing NULL map)

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