smb: enable reuse of deferred file handles for write operations

Previously, deferred file handles were reused only for read
operations, this commit extends to reusing deferred handles
for write operations. By reusing these handles we can reduce
the need for open/close operations over the wire.

Signed-off-by: Bharath SM <bharathsm@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/smb/client/file.c b/fs/smb/client/file.c
index a58a3333ecc300ab1974c9ea85ab637af81d64e1..3b2d33291a7e6443552d67315e567935214029ba 100644 (file)
--- a/fs/smb/client/file.c
+++ b/fs/smb/client/file.c
@@ -990,7 +990,11 @@ int cifs_open(struct inode *inode, struct file *file)
        }
 
        /* Get the cached handle as SMB2 close is deferred */
-       rc = cifs_get_readable_path(tcon, full_path, &cfile);
+       if (OPEN_FMODE(file->f_flags) & FMODE_WRITE) {
+               rc = cifs_get_writable_path(tcon, full_path, FIND_WR_FSUID_ONLY, &cfile);
+       } else {
+               rc = cifs_get_readable_path(tcon, full_path, &cfile);
+       }
        if (rc == 0) {
                if (file->f_flags == cfile->f_flags) {
                        file->private_data = cfile;