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/fat/file.c b/fs/fat/file.c
index a4a3a3c06436..e1587c54d3c1 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -397,6 +397,8 @@ int fat_setattr(struct dentry *dentry, struct iattr *attr)
          * sequence.
          */
         if (attr->ia_valid & ATTR_SIZE) {
+                inode_dio_wait(inode);
+
                 if (attr->ia_size > inode->i_size) {
                         error = fat_cont_expand(inode, attr->ia_size);
                         if (error || attr->ia_valid == ATTR_SIZE)