diff options
Diffstat (limited to 'fs/btrfs/locking.c')
-rw-r--r-- | fs/btrfs/locking.c | 33 |
1 files changed, 0 insertions, 33 deletions
diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c index 68fd9ccf1805..85506c4a3af7 100644 --- a/fs/btrfs/locking.c +++ b/fs/btrfs/locking.c | |||
@@ -25,21 +25,10 @@ | |||
25 | #include "extent_io.h" | 25 | #include "extent_io.h" |
26 | #include "locking.h" | 26 | #include "locking.h" |
27 | 27 | ||
28 | /* | ||
29 | * btrfs_header_level() isn't free, so don't call it when lockdep isn't | ||
30 | * on | ||
31 | */ | ||
32 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | ||
33 | static inline void spin_nested(struct extent_buffer *eb) | ||
34 | { | ||
35 | spin_lock_nested(&eb->lock, BTRFS_MAX_LEVEL - btrfs_header_level(eb)); | ||
36 | } | ||
37 | #else | ||
38 | static inline void spin_nested(struct extent_buffer *eb) | 28 | static inline void spin_nested(struct extent_buffer *eb) |
39 | { | 29 | { |
40 | spin_lock(&eb->lock); | 30 | spin_lock(&eb->lock); |
41 | } | 31 | } |
42 | #endif | ||
43 | 32 | ||
44 | /* | 33 | /* |
45 | * Setting a lock to blocking will drop the spinlock and set the | 34 | * Setting a lock to blocking will drop the spinlock and set the |
@@ -236,25 +225,3 @@ int btrfs_tree_locked(struct extent_buffer *eb) | |||
236 | return test_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags) || | 225 | return test_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags) || |
237 | spin_is_locked(&eb->lock); | 226 | spin_is_locked(&eb->lock); |
238 | } | 227 | } |
239 | |||
240 | /* | ||
241 | * btrfs_search_slot uses this to decide if it should drop its locks | ||
242 | * before doing something expensive like allocating free blocks for cow. | ||
243 | */ | ||
244 | int btrfs_path_lock_waiting(struct btrfs_path *path, int level) | ||
245 | { | ||
246 | int i; | ||
247 | struct extent_buffer *eb; | ||
248 | |||
249 | for (i = level; i <= level + 1 && i < BTRFS_MAX_LEVEL; i++) { | ||
250 | eb = path->nodes[i]; | ||
251 | if (!eb) | ||
252 | break; | ||
253 | smp_mb(); | ||
254 | if (spin_is_contended(&eb->lock) || | ||
255 | waitqueue_active(&eb->lock_wq)) | ||
256 | return 1; | ||
257 | } | ||
258 | return 0; | ||
259 | } | ||
260 | |||