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dm: move wait queue declaration 

Move wait queue declaration and unplug to dm_wait_for_completion.

The purpose is to minimize duplicate code in the further patches.

The patch reorders functions a little bit. It doesn't change any
functionality. For proper non-deadlock operation, add_wait_queue must
happen before set_current_state(interruptible) and before the test for
!atomic_read(&md->pending).

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
hifive-unleashed-5.1
Mikulas Patocka 2009-04-02 19:55:39 +01:00 committed by Alasdair G Kergon
parent 022c261100
commit b44ebeb017
1 changed files with 7 additions and 7 deletions
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14
drivers/md/dm.c
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@ -1377,6 +1377,11 @@ EXPORT_SYMBOL_GPL(dm_put);
static int dm_wait_for_completion(struct mapped_device *md, int interruptible)
{
int r = 0;
DECLARE_WAITQUEUE(wait, current);
dm_unplug_all(md->queue);
add_wait_queue(&md->wait, &wait);
while (1) {
set_current_state(interruptible);
@ -1395,6 +1400,8 @@ static int dm_wait_for_completion(struct mapped_device *md, int interruptible)
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&md->wait, &wait);
return r;
}
@ -1501,7 +1508,6 @@ static void unlock_fs(struct mapped_device *md)
int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
{
struct dm_table *map = NULL;
DECLARE_WAITQUEUE(wait, current);
int r = 0;
int do_lockfs = suspend_flags & DM_SUSPEND_LOCKFS_FLAG ? 1 : 0;
int noflush = suspend_flags & DM_SUSPEND_NOFLUSH_FLAG ? 1 : 0;
@ -1551,20 +1557,14 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
down_write(&md->io_lock);
set_bit(DMF_BLOCK_IO, &md->flags);
add_wait_queue(&md->wait, &wait);
up_write(&md->io_lock);
/* unplug */
if (map)
dm_table_unplug_all(map);
/*
* Wait for the already-mapped ios to complete.
*/
r = dm_wait_for_completion(md, TASK_INTERRUPTIBLE);
down_write(&md->io_lock);
remove_wait_queue(&md->wait, &wait);
if (noflush)
clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags);