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dm snapshot: create function for chunk_is_tracked wait 

Move the __chunk_is_tracked() loop into a separate function as we will
also need to call it from the write path in the rare case of conflicting
writes to the same chunk.

Originally introduced in commit a8d41b59f3
("dm snapshot: fix race during exception creation").

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mike Snitzer 2009-12-10 23:52:29 +00:00 committed by Alasdair G Kergon
parent 9eaae8ffbc
commit 615d1eb9ca
1 changed files with 12 additions and 6 deletions
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18
drivers/md/dm-snap.c
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@ -233,6 +233,16 @@ static int __chunk_is_tracked(struct dm_snapshot *s, chunk_t chunk)
return found; return found;
} }
/*
* This conflicting I/O is extremely improbable in the caller,
* so msleep(1) is sufficient and there is no need for a wait queue.
*/
static void __check_for_conflicting_io(struct dm_snapshot *s, chunk_t chunk)
{
while (__chunk_is_tracked(s, chunk))
msleep(1);
}
/* /*
* One of these per registered origin, held in the snapshot_origins hash * One of these per registered origin, held in the snapshot_origins hash
*/ */
@ -1102,12 +1112,8 @@ static void pending_complete(struct dm_snap_pending_exception *pe, int success)
goto out; goto out;
} }
/* /* Check for conflicting reads */
* Check for conflicting reads. This is extremely improbable, __check_for_conflicting_io(s, pe->e.old_chunk);
* so msleep(1) is sufficient and there is no need for a wait queue.
*/
while (__chunk_is_tracked(s, pe->e.old_chunk))
msleep(1);
/* /*
* Add a proper exception, and remove the * Add a proper exception, and remove the