diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-03 10:02:45 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-03 10:02:45 -0700 |
| commit | d9b9be024a6628a01d8730d1fd0b5f25658a2794 (patch) | |
| tree | 9f8e606f975f6dff4213747e85fedaccd148eb60 /drivers/md/dm-table.c | |
| parent | 9b59f0316bc556a1b63518f0b1224cf9be48467b (diff) | |
| parent | 99360b4c18f7675b50d283301d46d755affe75fd (diff) | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm
* git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm: (36 commits)
dm: set queue ordered mode
dm: move wait queue declaration
dm: merge pushback and deferred bio lists
dm: allow uninterruptible wait for pending io
dm: merge __flush_deferred_io into caller
dm: move bio_io_error into __split_and_process_bio
dm: rename __split_bio
dm: remove unnecessary struct dm_wq_req
dm: remove unnecessary work queue context field
dm: remove unnecessary work queue type field
dm: bio list add bio_list_add_head
dm snapshot: persistent fix dtr cleanup
dm snapshot: move status to exception store
dm snapshot: move ctr parsing to exception store
dm snapshot: use DMEMIT macro for status
dm snapshot: remove dm_snap header
dm snapshot: remove dm_snap header use
dm exception store: move cow pointer
dm exception store: move chunk_fields
dm exception store: move dm_target pointer
...
Diffstat (limited to 'drivers/md/dm-table.c')
| -rw-r--r-- | drivers/md/dm-table.c | 26 |
1 files changed, 14 insertions, 12 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 2fd66c30f7f..e8361b191b9 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -399,28 +399,30 @@ static int check_device_area(struct dm_dev_internal *dd, sector_t start, } /* - * This upgrades the mode on an already open dm_dev. Being + * This upgrades the mode on an already open dm_dev, being * careful to leave things as they were if we fail to reopen the - * device. + * device and not to touch the existing bdev field in case + * it is accessed concurrently inside dm_table_any_congested(). */ static int upgrade_mode(struct dm_dev_internal *dd, fmode_t new_mode, struct mapped_device *md) { int r; - struct dm_dev_internal dd_copy; - dev_t dev = dd->dm_dev.bdev->bd_dev; + struct dm_dev_internal dd_new, dd_old; - dd_copy = *dd; + dd_new = dd_old = *dd; + + dd_new.dm_dev.mode |= new_mode; + dd_new.dm_dev.bdev = NULL; + + r = open_dev(&dd_new, dd->dm_dev.bdev->bd_dev, md); + if (r) + return r; dd->dm_dev.mode |= new_mode; - dd->dm_dev.bdev = NULL; - r = open_dev(dd, dev, md); - if (!r) - close_dev(&dd_copy, md); - else - *dd = dd_copy; + close_dev(&dd_old, md); - return r; + return 0; } /* |