CIFS: Allow wsize to exceed CIFSMaxBufSize

This allows cifs_writepages to send data in larger chunks from the page
cache, without requiring larger memory allocations in other cases.

Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 0473b221f643..0f66ae5b694b 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -925,6 +925,7 @@ static struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode)
                                 /* if it fails, try another handle - might be */
                                 /* dangerous to hold up writepages with retry */
                                 if(rc) {
+                                        cFYI(1,("failed on reopen file in wp"));
                                         read_lock(&GlobalSMBSeslock);
                                         continue;
                                 }
@@ -1028,6 +1029,13 @@ static int cifs_writepages(struct address_space *mapping,
         if (cifs_sb->wsize < PAGE_CACHE_SIZE)
                 return generic_writepages(mapping, wbc);
 
+        /* BB FIXME we do not have code to sign across multiple buffers yet,
+           so go to older writepage style write which we can sign if needed */
+        if((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server))
+                if(cifs_sb->tcon->ses->server->secMode &
+                          (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
+                        return generic_writepages(mapping, wbc);
+
         /*
          * BB: Is this meaningful for a non-block-device file system?
          * If it is, we should test it again after we do I/O