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| author | Philipp Reisner <philipp.reisner@linbit.com> | 2011-04-13 14:46:05 -0700 |
|---|---|---|
| committer | Philipp Reisner <philipp.reisner@linbit.com> | 2012-11-08 16:45:17 +0100 |
| commit | d3fcb4908d8cce7f29cff16bbef3b08933148003 (patch) | |
| tree | fc457ab337f19aa265a3b5cc4d5bcacc5b664315 /drivers/block/drbd/drbd_proc.c | |
| parent | ef356262846eb49821db7b20a131b6573e4c7d2e (diff) | |
| download | blackbird-op-linux-d3fcb4908d8cce7f29cff16bbef3b08933148003.tar.gz blackbird-op-linux-d3fcb4908d8cce7f29cff16bbef3b08933148003.zip | |
drbd: protect all idr accesses that might sleep with drbd_cfg_rwsem
With this commit the locking for all accesses to IDRs is complete:
* Non sleeping read accesses are protected by RCU
* sleeping read accesses are protocted by a read lock on drbd_cfg_rwsem
* accesses that add anything are protected by a write lock
* accesses that remove an object are protoected by a write lock
and a call to synchronize_rcu() after it is removed from the IDR
and before the object is actually free()ed.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Diffstat (limited to 'drivers/block/drbd/drbd_proc.c')
| -rw-r--r-- | drivers/block/drbd/drbd_proc.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/block/drbd/drbd_proc.c b/drivers/block/drbd/drbd_proc.c index a4dbdbc52c15..4025d0883bad 100644 --- a/drivers/block/drbd/drbd_proc.c +++ b/drivers/block/drbd/drbd_proc.c @@ -227,6 +227,7 @@ static int drbd_seq_show(struct seq_file *seq, void *v) oos .. known out-of-sync kB */ + down_read(&drbd_cfg_rwsem); idr_for_each_entry(&minors, mdev, i) { if (prev_i != i - 1) seq_printf(seq, "\n"); @@ -293,6 +294,7 @@ static int drbd_seq_show(struct seq_file *seq, void *v) } } } + up_read(&drbd_cfg_rwsem); return 0; } |
