From:   Pei-Feng liu <liupeifeng@horiscale.com>
To:     linux-nfs@vger.kernel.org
Cc:     Pei-Feng liu <liupeifeng@horiscale.com>
Subject: [PATCH] Using a larger memory to cache filename when decoding FH
Date:   Sat, 23 Mar 2019 21:46:33 +0800
Message-Id: <1553348794-4505-1-git-send-email-liupeifeng@horiscale.com>
Sender: linux-nfs-owner@vger.kernel.org
Precedence: bulk

The maximum length of filename string in 'fs/exportfs/expfs.c' is limited to be
'NAME_MAX'. But I have a special filesystem driver with longer filename. When
exporting it's namespace with NFS, 'exportfs_decode_fh()' can't holds the
filename if its length is larger than 'NAME_MAX'. And 'dentry' in VFS layer
doesn't contrain the length of filename within 'NAME_MAX'. I guess the correct
method is firstly probe the length of filename with 'vfs_statfs()'. With this
value to malloc a larger enough memory to cache the filename when decoding a FH.

Pei-Feng liu (1):
  fs/exportfs: Decoding FH with a larger memory to cache the filename.

 fs/exportfs/expfs.c | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

-- 
1.8.3.1