diff options
| author | Arne Jansen <sensille@gmx.net> | 2011-09-13 10:55:48 +0200 |
|---|---|---|
| committer | Jan Schmidt <list.btrfs@jan-o-sch.net> | 2012-01-04 16:12:29 +0100 |
| commit | 5b25f70f4200766355cdabda604e131d2fb6010d (patch) | |
| tree | 20749d5e90763e8c1746d36b00c5beec5e3660b9 /fs/btrfs/extent_io.h | |
| parent | Btrfs: always save ref_root in delayed refs (diff) | |
| download | linux-5b25f70f4200766355cdabda604e131d2fb6010d.tar.xz linux-5b25f70f4200766355cdabda604e131d2fb6010d.zip | |
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')
| -rw-r--r-- | fs/btrfs/extent_io.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index 7604c3001322..bc6a042cb6fc 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; |