Merge tag 'v4.13-rc1' into fixes

The fixes branch is based off a random pre-rc1 commit, because we had
some fixes that needed to go in before rc1 was released.

However we now need to fix some code that went in after that point, but
before rc1, so merge rc1 to get that code into fixes so we can fix it!

1 files changed, 14 insertions, 12 deletions

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index a85d7903fbdd..9e75d8a39aac 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1881,16 +1881,25 @@ static ssize_t btrfs_file_write_iter(struct kiocb *iocb,
 	ssize_t num_written = 0;
 	bool sync = (file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host);
 	ssize_t err;
-	loff_t pos = iocb->ki_pos;
+	loff_t pos;
 	size_t count = iov_iter_count(from);
 	loff_t oldsize;
 	int clean_page = 0;
 
-	if ((iocb->ki_flags & IOCB_NOWAIT) &&
-			(iocb->ki_flags & IOCB_DIRECT)) {
-		/* Don't sleep on inode rwsem */
-		if (!inode_trylock(inode))
+	if (!inode_trylock(inode)) {
+		if (iocb->ki_flags & IOCB_NOWAIT)
 			return -EAGAIN;
+		inode_lock(inode);
+	}
+
+	err = generic_write_checks(iocb, from);
+	if (err <= 0) {
+		inode_unlock(inode);
+		return err;
+	}
+
+	pos = iocb->ki_pos;
+	if (iocb->ki_flags & IOCB_NOWAIT) {
 		/*
 		 * We will allocate space in case nodatacow is not set,
 		 * so bail
@@ -1901,13 +1910,6 @@ static ssize_t btrfs_file_write_iter(struct kiocb *iocb,
 			inode_unlock(inode);
 			return -EAGAIN;
 		}
-	} else
-		inode_lock(inode);
-
-	err = generic_write_checks(iocb, from);
-	if (err <= 0) {
-		inode_unlock(inode);
-		return err;
 	}
 
 	current->backing_dev_info = inode_to_bdi(inode);