fs: move inode_dio_wait calls into ->setattr

Let filesystems handle waiting for direct I/O requests themselves instead
of doing it beforehand.  This means filesystem-specific locks to prevent
new dio referenes from appearing can be held.  This is important to allow
generalizing i_dio_count to non-DIO_LOCKING filesystems.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index be8664c6a825..13f113154a9f 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -778,6 +778,8 @@ int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
 
         if ((iattr->ia_valid & ATTR_SIZE) &&
             iattr->ia_size != i_size_read(inode)) {
+                inode_dio_wait(inode);
+
                 err = vmtruncate(inode, iattr->ia_size);
                 if (unlikely(err))
                         goto out_err;