[CIFS] Support for legacy servers part 3 - Add support for Open and most

of Read support.

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

1 files changed, 27 insertions, 2 deletions

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 5857d12611e6..8ae962e7c93f 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -256,6 +256,13 @@ int cifs_open(struct inode *inode, struct file *file)
                          CREATE_NOT_DIR, &netfid, &oplock, buf,
                          cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
                                  & CIFS_MOUNT_MAP_SPECIAL_CHR);
+        if (rc == -EIO) {
+                /* Old server, try legacy style OpenX */
+                rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
+                        desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf,
+                        cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
+                                & CIFS_MOUNT_MAP_SPECIAL_CHR);
+        }
         if (rc) {
                 cFYI(1, ("cifs_open returned 0x%x ", rc));
                 goto out;
@@ -1210,7 +1217,12 @@ ssize_t cifs_user_read(struct file *file, char __user *read_data,
                                  open_file->netfid,
                                  current_read_size, *poffset,
                                  &bytes_read, &smb_read_data);
-
+                        if(rc == -EINVAL) {
+                                rc = SMBLegacyRead(xid, pTcon,
+                                        open_file->netfid,
+                                        current_read_size, *poffset,
+                                        &bytes_read, &smb_read_data);
+                        }
                         pSMBr = (struct smb_com_read_rsp *)smb_read_data;
                         if (copy_to_user(current_offset, 
                                          smb_read_data + 4 /* RFC1001 hdr */
@@ -1287,6 +1299,12 @@ static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
                                  open_file->netfid,
                                  current_read_size, *poffset,
                                  &bytes_read, &current_offset);
+                        if(rc == -EINVAL) {
+                                rc = SMBLegacyRead(xid, pTcon,
+                                        open_file->netfid,
+                                        current_read_size, *poffset,
+                                        &bytes_read, &current_offset);
+                        }
                 }
                 if (rc || (bytes_read == 0)) {
                         if (total_read) {
@@ -1443,7 +1461,14 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
                                 open_file->netfid,
                                 read_size, offset,
                                 &bytes_read, &smb_read_data);
-                        /* BB need to check return code here */
+                        if (rc == -EINVAL) {
+                                rc = SMBLegacyRead(xid, pTcon,
+                                        open_file->netfid,
+                                        read_size, offset,
+                                        &bytes_read, &smb_read_data);
+                        }
+
+                        /* BB more RC checks ? */
                         if (rc== -EAGAIN) {
                                 if (smb_read_data) {
                                         cifs_buf_release(smb_read_data);