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| author | Mikulas Patocka | 2009-04-02 20:55:39 +0200 |
|---|---|---|
| committer | Alasdair G Kergon | 2009-04-02 20:55:39 +0200 |
| commit | b44ebeb017b8a5fe5439e1259708b68cf83a8921 (patch) | |
| tree | ea138d44aa80302002b3e67cd6049a18c2302734 /drivers/md/dm.c | |
| parent | dm: merge pushback and deferred bio lists (diff) | |
| download | kernel-qcow2-linux-b44ebeb017b8a5fe5439e1259708b68cf83a8921.tar.gz kernel-qcow2-linux-b44ebeb017b8a5fe5439e1259708b68cf83a8921.tar.xz kernel-qcow2-linux-b44ebeb017b8a5fe5439e1259708b68cf83a8921.zip | |
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>
Diffstat (limited to 'drivers/md/dm.c')
| -rw-r--r-- | drivers/md/dm.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index f5703727d974..7867d905ff89 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -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); |