cifs: Fix inability to write files >2GB to SMB2/3 shares

commit 2f6c9479633780ba4a3484bba7eba5a721a5cf20 upstream.

When connecting to SMB2/3 shares, maximum file size is set to non-LFS maximum in superblock. This is due to cap_large_files bit being different for SMB1 and SMB2/3 (where it is just an internal flag that is not negotiated and the SMB1 one corresponds to multichannel capability, so maybe LFS works correctly if server sends 0x08 flag) while capabilities are checked always for the SMB1 bit in cifs_read_super().

The patch fixes this by checking for the correct bit according to the protocol version.

Signed-off-by: Jan Klos <honza.klos@gmail.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 85ea98d139fc5643b0606b67959bb1f320037d80..40cfef58dcc3d063a6a2d6dc4cfa9bb98df93f5d 100644 (file)
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -120,14 +120,16 @@ cifs_read_super(struct super_block *sb)
 {
        struct inode *inode;
        struct cifs_sb_info *cifs_sb;
+       struct cifs_tcon *tcon;
        int rc = 0;
 
        cifs_sb = CIFS_SB(sb);
+       tcon = cifs_sb_master_tcon(cifs_sb);
 
        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
                sb->s_flags |= MS_POSIXACL;
 
-       if (cifs_sb_master_tcon(cifs_sb)->ses->capabilities & CAP_LARGE_FILES)
+       if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
                sb->s_maxbytes = MAX_LFS_FILESIZE;
        else
                sb->s_maxbytes = MAX_NON_LFS;
@@ -147,7 +149,7 @@ cifs_read_super(struct super_block *sb)
                goto out_no_root;
        }
 
-       if (cifs_sb_master_tcon(cifs_sb)->nocase)
+       if (tcon->nocase)
                sb->s_d_op = &cifs_ci_dentry_ops;
        else
                sb->s_d_op = &cifs_dentry_ops;