Adjust cifssb maximum read size

When session gets reconnected during mount then read size in super block fs context
gets set to zero and after negotiate, rsize is not modified which results in
incorrect read with requested bytes as zero. Fixes intermittent failure
of xfstest generic/240

Note that stable requires a different version of this patch which will be
sent to the stable mailing list.

Signed-off-by: Rohith Surabattula <rohiths@microsoft.com>
Acked-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index a61bb5d..677c02a 100644 (file)
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -210,6 +210,9 @@ cifs_read_super(struct super_block *sb)
        if (rc)
                goto out_no_root;
        /* tune readahead according to rsize if readahead size not set on mount */
+       if (cifs_sb->ctx->rsize == 0)
+               cifs_sb->ctx->rsize =
+                       tcon->ses->server->ops->negotiate_rsize(tcon, cifs_sb->ctx);
        if (cifs_sb->ctx->rasize)
                sb->s_bdi->ra_pages = cifs_sb->ctx->rasize / PAGE_SIZE;
        else

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index e7af802..a2723f7 100644 (file)
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -3740,6 +3740,11 @@ cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file,
                                break;
                }
 
+               if (cifs_sb->ctx->rsize == 0)
+                       cifs_sb->ctx->rsize =
+                               server->ops->negotiate_rsize(tlink_tcon(open_file->tlink),
+                                                            cifs_sb->ctx);
+
                rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize,
                                                   &rsize, credits);
                if (rc)
@@ -4474,6 +4479,11 @@ static void cifs_readahead(struct readahead_control *ractl)
                        }
                }
 
+               if (cifs_sb->ctx->rsize == 0)
+                       cifs_sb->ctx->rsize =
+                               server->ops->negotiate_rsize(tlink_tcon(open_file->tlink),
+                                                            cifs_sb->ctx);
+
                rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize,
                                                   &rsize, credits);
                if (rc)