[CIFS] Add support for legacy servers part 5

Handle small negotiated read sizes (under 4K) and finish up
read and write support.

Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index 9780f4ee7f12..a1e8dc901de4 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -200,7 +200,10 @@ static void fill_in_inode(struct inode *tmp_inode,
                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
                         tmp_inode->i_fop->lock = NULL;
                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
-
+                if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
+                   (cifs_sb->tcon->ses->server->maxBuf <
+                        4096 + MAX_CIFS_HDR_SIZE))
+                        tmp_inode->i_data.a_ops->readpages = NULL;
                 if(isNewInode)
                         return; /* No sense invalidating pages for new inode
                                    since have not started caching readahead file
@@ -306,6 +309,10 @@ static void unix_fill_in_inode(struct inode *tmp_inode,
                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
                         tmp_inode->i_fop->lock = NULL;
                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
+                if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
+                   (cifs_sb->tcon->ses->server->maxBuf < 
+                        4096 + MAX_CIFS_HDR_SIZE))
+                        tmp_inode->i_data.a_ops->readpages = NULL;
 
                 if(isNewInode)
                         return; /* No sense invalidating pages for new inode since we