CIFS: Implement cifs_strict_writev (try #4)

If we don't have Exclusive oplock we write a data to the server.
Also set invalidate_mapping flag on the inode if we wrote something
to the server. Add cifs_iovec_write to let the client write iovec
buffers through CIFSSMBWrite2.

Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 11 insertions, 4 deletions

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index a8323f1dc1c4..f2970136d17d 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -600,10 +600,17 @@ static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 {
         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
         ssize_t written;
+        int rc;
 
         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
-        if (!CIFS_I(inode)->clientCanCacheAll)
-                filemap_fdatawrite(inode->i_mapping);
+
+        if (CIFS_I(inode)->clientCanCacheAll)
+                return written;
+
+        rc = filemap_fdatawrite(inode->i_mapping);
+        if (rc)
+                cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc, inode);
+
         return written;
 }
 
@@ -737,7 +744,7 @@ const struct file_operations cifs_file_strict_ops = {
         .read = do_sync_read,
         .write = do_sync_write,
         .aio_read = cifs_strict_readv,
-        .aio_write = cifs_file_aio_write,
+        .aio_write = cifs_strict_writev,
         .open = cifs_open,
         .release = cifs_close,
         .lock = cifs_lock,
@@ -793,7 +800,7 @@ const struct file_operations cifs_file_strict_nobrl_ops = {
         .read = do_sync_read,
         .write = do_sync_write,
         .aio_read = cifs_strict_readv,
-        .aio_write = cifs_file_aio_write,
+        .aio_write = cifs_strict_writev,
         .open = cifs_open,
         .release = cifs_close,
         .fsync = cifs_strict_fsync,