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authorNikolay Borisov <nborisov@suse.com>2019-01-03 10:50:03 +0200
committerDavid Sterba <dsterba@suse.com>2019-02-25 14:13:20 +0100
commit4546d178745d5d5f78352a275cf50caa47528436 (patch)
treefe69937cc2ee2dd8144d684306e85703b8aa6023 /fs/btrfs/inode.c
parenta1d64ba60926d095d77f747a0c50159d9e2a4d98 (diff)
downloadlinux-4546d178745d5d5f78352a275cf50caa47528436.tar.bz2
btrfs: Document logic regarding inode in async_cow_submit
Add a comment explaining when ->inode could be NULL and why we always perform the ->async_delalloc_pages modification. Signed-off-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/inode.c')
-rw-r--r--fs/btrfs/inode.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index cb996903c739..05c50a02d4ff 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1165,6 +1165,12 @@ static noinline void async_cow_submit(struct btrfs_work *work)
5 * SZ_1M)
cond_wake_up_nomb(&fs_info->async_submit_wait);
+ /*
+ * ->inode could be NULL if async_cow_start has failed to compress,
+ * in which case we don't have anything to submit, yet we need to
+ * always adjust ->async_delalloc_pages as its paired with the init
+ * happening in cow_file_range_async
+ */
if (async_cow->inode)
submit_compressed_extents(async_cow);
}