linux-kernel - [PATCH v2] NILFS2: support NFSv2 export

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Message-ID: <20150511211302.1299aff5@notabene.brown>
Date:	Mon, 11 May 2015 21:13:02 +1000
From:	NeilBrown <neilb@...e.de>
To:	Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
Cc:	Josef Bacik <jbacik@...com>, Chris Mason <clm@...com>,
	Jan Kara <jack@...e.cz>, David Sterba <dsterba@...e.cz>,
	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-nilfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-btrfs@...r.kernel.org
Subject: [PATCH v2] NILFS2: support NFSv2 export


The "fh_len" passed to ->fh_to_* is not guaranteed to be that same as
that returned by encode_fh - it may be larger.

With NFSv2, the filehandle is fixed length, so it may appear longer
than expected and be zero-padded.

So we must test that fh_len is at least some value, not exactly equal
to it.

Signed-off-by: NeilBrown <neilb@...e.de>

diff --git a/fs/nilfs2/namei.c b/fs/nilfs2/namei.c
index 22180836ec22..37dd6b05b1b5 100644
--- a/fs/nilfs2/namei.c
+++ b/fs/nilfs2/namei.c
@@ -496,8 +496,7 @@ static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
 {
 	struct nilfs_fid *fid = (struct nilfs_fid *)fh;
 
-	if ((fh_len != NILFS_FID_SIZE_NON_CONNECTABLE &&
-	     fh_len != NILFS_FID_SIZE_CONNECTABLE) ||
+	if (fh_len < NILFS_FID_SIZE_NON_CONNECTABLE ||
 	    (fh_type != FILEID_NILFS_WITH_PARENT &&
 	     fh_type != FILEID_NILFS_WITHOUT_PARENT))
 		return NULL;
@@ -510,7 +509,7 @@ static struct dentry *nilfs_fh_to_parent(struct super_block *sb, struct fid *fh,
 {
 	struct nilfs_fid *fid = (struct nilfs_fid *)fh;
 
-	if (fh_len != NILFS_FID_SIZE_CONNECTABLE ||
+	if (fh_len < NILFS_FID_SIZE_CONNECTABLE ||
 	    fh_type != FILEID_NILFS_WITH_PARENT)
 		return NULL;
 

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