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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@suse.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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