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dm: refactor dm_suspend completion wait

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Move completion wait to separate function

Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Milan Broz 2008-02-08 02:10:30 +00:00 committed by Alasdair G Kergon
parent 94d6351e14
commit 46125c1c90
1 changed files with 27 additions and 16 deletions
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43
drivers/md/dm.c
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@ -1259,6 +1259,29 @@ void dm_put(struct mapped_device *md)
}
EXPORT_SYMBOL_GPL(dm_put);
static int dm_wait_for_completion(struct mapped_device *md)
{
int r = 0;
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
smp_mb();
if (!atomic_read(&md->pending))
break;
if (signal_pending(current)) {
r = -EINTR;
break;
}
io_schedule();
}
set_current_state(TASK_RUNNING);
return r;
}
/*
* Process the deferred bios
*/
@ -1357,7 +1380,7 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
{
struct dm_table *map = NULL;
DECLARE_WAITQUEUE(wait, current);
int pending, r = 0;
int r = 0;
int do_lockfs = suspend_flags & DM_SUSPEND_LOCKFS_FLAG ? 1 : 0;
int noflush = suspend_flags & DM_SUSPEND_NOFLUSH_FLAG ? 1 : 0;
@ -1414,20 +1437,9 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
dm_table_unplug_all(map);
/*
* Then we wait for the already mapped ios to
* complete.
* Wait for the already-mapped ios to complete.
*/
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
smp_mb();
pending = atomic_read(&md->pending);
if (!pending || signal_pending(current))
break;
io_schedule();
}
set_current_state(TASK_RUNNING);
r = dm_wait_for_completion(md);
down_write(&md->io_lock);
remove_wait_queue(&md->wait, &wait);
@ -1437,13 +1449,12 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
up_write(&md->io_lock);
/* were we interrupted ? */
if (pending) {
if (r < 0) {
down_write(&md->io_lock);
__flush_deferred_io(md);
up_write(&md->io_lock);
unlock_fs(md);
r = -EINTR;
goto out; /* pushback list is already flushed, so skip flush */
}