btrfs: Implement set_extent_bits_nowait

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 <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 26d7b6a..ff1f7b4 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1368,6 +1368,13 @@ 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 7121343..6435c28 100644 (file)
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -328,6 +328,8 @@ 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)