[PATCH v4 07/15] btrfs: Implement set_extent_bits_nowait

[Nikolay Borisov]

It will be used in a future patch that will require modifying an
extent_io_tree struct under a spinlock.

Signed-off-by: Nikolay Borisov <nbori...@suse.com>
---
 fs/btrfs/extent_io.c | 7 +++++++
 fs/btrfs/extent_io.h | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index eec64436d488..4bf17d4c0819 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1366,6 +1366,13 @@ int set_record_extent_bits(struct extent_io_tree *tree, 
u64 start, u64 end,
                                changeset);
 }
 
+int set_extent_bits_nowait(struct extent_io_tree *tree, u64 start, u64 end,
+                          unsigned bits)
+{
+       return __set_extent_bit(tree, start, end, bits, 0, NULL, NULL,
+                               GFP_NOWAIT, NULL);
+}
+
 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
                     unsigned bits, int wake, int delete,
                     struct extent_state **cached)
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 0fda249e5982..c23ce4df88f3 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -329,6 +329,8 @@ int set_record_extent_bits(struct extent_io_tree *tree, u64 
start, u64 end,
 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
                   unsigned bits, u64 *failed_start,
                   struct extent_state **cached_state, gfp_t mask);
+int set_extent_bits_nowait(struct extent_io_tree *tree, u64 start, u64 end,
+                          unsigned bits);
 
 static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
                u64 end, unsigned bits)
-- 
2.17.1