path: root/fs/btrfs/extent_io.h
diff options
authorArne Jansen <sensille@gmx.net>2011-09-13 10:55:48 +0200
committerJan Schmidt <list.btrfs@jan-o-sch.net>2012-01-04 16:12:29 +0100
commit5b25f70f4200766355cdabda604e131d2fb6010d (patch)
tree20749d5e90763e8c1746d36b00c5beec5e3660b9 /fs/btrfs/extent_io.h
parenteebe063b7f916087cd5c61de57b20a3a30894a96 (diff)
Btrfs: add nested locking mode for paths
This patch adds the possibilty to read-lock an extent even if it is already write-locked from the same thread. btrfs_find_all_roots() needs this capability. Signed-off-by: Arne Jansen <sensille@gmx.net> Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
Diffstat (limited to 'fs/btrfs/extent_io.h')
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 7604c300132..bc6a042cb6f 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -129,6 +129,7 @@ struct extent_buffer {
struct list_head leak_list;
struct rcu_head rcu_head;
atomic_t refs;
+ pid_t lock_owner;
/* count of read lock holders on the extent buffer */
atomic_t write_locks;
@@ -137,6 +138,7 @@ struct extent_buffer {
atomic_t blocking_readers;
atomic_t spinning_readers;
atomic_t spinning_writers;
+ int lock_nested;
/* protects write locks */
rwlock_t lock;