On Mon, Sep 12, 2011 at 07:37:26PM -0400, Chuck Lever wrote:
> From: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
>
> Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
> [ cel: since this is server-side, use nfsd4_ prefix instead of nfs4_ prefix. ]
> [ cel: implement S_ISVTX filter in bfields-normal form ]
Hm.--b.
> Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
> ---
>
> fs/nfsd/nfsd.h | 7 +++++++
> fs/nfsd/vfs.c | 18 ++++++++++++++++++
> 2 files changed, 25 insertions(+), 0 deletions(-)
>
> diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
> index 7ecfa24..d314812 100644
> --- a/fs/nfsd/nfsd.h
> +++ b/fs/nfsd/nfsd.h
> @@ -335,6 +335,13 @@ static inline u32 nfsd_suppattrs2(u32 minorversion)
> #define NFSD_SUPPATTR_EXCLCREAT_WORD2 \
> NFSD_WRITEABLE_ATTRS_WORD2
>
> +extern int nfsd4_is_junction(struct dentry *dentry);
> +#else
> +static inline int nfsd4_is_junction(struct dentry *dentry)
> +{
> + return 0;
> +}
> +
> #endif /* CONFIG_NFSD_V4 */
>
> #endif /* LINUX_NFSD_NFSD_H */
> diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
> index fd0acca..d1d4d5e 100644
> --- a/fs/nfsd/vfs.c
> +++ b/fs/nfsd/vfs.c
> @@ -168,6 +168,8 @@ int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp)
> {
> if (d_mountpoint(dentry))
> return 1;
> + if (nfsd4_is_junction(dentry))
> + return 1;
> if (!(exp->ex_flags & NFSEXP_V4ROOT))
> return 0;
> return dentry->d_inode != NULL;
> @@ -592,6 +594,22 @@ nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_ac
> return error;
> }
>
> +#define NFSD_XATTR_JUNCTION_PREFIX XATTR_TRUSTED_PREFIX "junction."
> +#define NFSD_XATTR_JUNCTION_TYPE NFSD_XATTR_JUNCTION_PREFIX "type"
> +int nfsd4_is_junction(struct dentry *dentry)
> +{
> + struct inode *inode = dentry->d_inode;
> +
> + if (inode == NULL)
> + return 0;
> + if (inode->i_mode & S_IXUGO)
> + return 0;
> + if (!(inode->i_mode & S_ISVTX))
> + return 0;
> + if (vfs_getxattr(dentry, NFSD_XATTR_JUNCTION_TYPE, NULL, 0) <= 0)
> + return 0;
> + return 1;
> +}
> #endif /* defined(CONFIG_NFSD_V4) */
>
> #ifdef CONFIG_NFSD_V3
>
> --
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