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[PATCH] device-mapper: tidy dm_suspend

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Tidy dm_suspend.

Signed-Off-By: Alasdair G Kergon <agk@redhat.com>
From: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Alasdair G Kergon 2005-05-05 16:16:06 -07:00 committed by Linus Torvalds
parent 354e007121
commit b84b0287a8
1 changed files with 23 additions and 20 deletions
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43
drivers/md/dm.c
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@ -1048,20 +1048,16 @@ int dm_suspend(struct mapped_device *md)
{
struct dm_table *map;
DECLARE_WAITQUEUE(wait, current);
int error;
int error = -EINVAL;
/* Flush I/O to the device. */
down_read(&md->lock);
if (test_bit(DMF_BLOCK_IO, &md->flags)) {
up_read(&md->lock);
return -EINVAL;
}
if (test_bit(DMF_BLOCK_IO, &md->flags))
goto out_read_unlock;
error = __lock_fs(md);
if (error) {
up_read(&md->lock);
return error;
}
if (error)
goto out_read_unlock;
map = dm_get_table(md);
if (map)
@ -1075,15 +1071,14 @@ int dm_suspend(struct mapped_device *md)
* If the flag is already set we know another thread is trying to
* suspend as well, so we leave the fs locked for this thread.
*/
error = -EINVAL;
down_write(&md->lock);
if (test_bit(DMF_BLOCK_IO, &md->flags)) {
up_write(&md->lock);
if (test_and_set_bit(DMF_BLOCK_IO, &md->flags)) {
if (map)
dm_table_put(map);
return -EINVAL;
goto out_write_unlock;
}
set_bit(DMF_BLOCK_IO, &md->flags);
add_wait_queue(&md->wait, &wait);
up_write(&md->lock);
@ -1111,13 +1106,9 @@ int dm_suspend(struct mapped_device *md)
remove_wait_queue(&md->wait, &wait);
/* were we interrupted ? */
if (atomic_read(&md->pending)) {
/* FIXME Undo the presuspend_targets */
__unlock_fs(md);
clear_bit(DMF_BLOCK_IO, &md->flags);
up_write(&md->lock);
return -EINTR;
}
error = -EINTR;
if (atomic_read(&md->pending))
goto out_unfreeze;
set_bit(DMF_SUSPENDED, &md->flags);
@ -1128,6 +1119,18 @@ int dm_suspend(struct mapped_device *md)
up_write(&md->lock);
return 0;
out_unfreeze:
/* FIXME Undo dm_table_presuspend_targets */
__unlock_fs(md);
clear_bit(DMF_BLOCK_IO, &md->flags);
out_write_unlock:
up_write(&md->lock);
return error;
out_read_unlock:
up_read(&md->lock);
return error;
}
int dm_resume(struct mapped_device *md)