[v4,7/8] NFSD: allow inter server COPY to have a STALE source server fh
diff mbox series

Message ID 20190708192352.12614-8-olga.kornievskaia@gmail.com
State New
Headers show
Series
  • server-side support for "inter" SSC copy
Related show

Commit Message

Olga Kornievskaia July 8, 2019, 7:23 p.m. UTC
The inter server to server COPY source server filehandle
is a foreign filehandle as the COPY is sent to the destination
server.

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
---
 fs/nfsd/Kconfig    | 10 ++++++++++
 fs/nfsd/nfs4proc.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++----
 fs/nfsd/nfsfh.h    |  5 ++++-
 fs/nfsd/xdr4.h     |  1 +
 4 files changed, 64 insertions(+), 5 deletions(-)

Comments

J . Bruce Fields July 23, 2019, 9:35 p.m. UTC | #1
On Mon, Jul 08, 2019 at 03:23:51PM -0400, Olga Kornievskaia wrote:
> The inter server to server COPY source server filehandle
> is a foreign filehandle as the COPY is sent to the destination
> server.
> 
> Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
> ---
>  fs/nfsd/Kconfig    | 10 ++++++++++
>  fs/nfsd/nfs4proc.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++----
>  fs/nfsd/nfsfh.h    |  5 ++++-
>  fs/nfsd/xdr4.h     |  1 +
>  4 files changed, 64 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig
> index d25f6bb..bef3a58 100644
> --- a/fs/nfsd/Kconfig
> +++ b/fs/nfsd/Kconfig
> @@ -132,6 +132,16 @@ config NFSD_FLEXFILELAYOUT
>  
>  	  If unsure, say N.
>  
> +config NFSD_V4_2_INTER_SSC
> +	bool "NFSv4.2 inter server to server COPY"
> +	depends on NFSD_V4 && NFS_V4_1 && NFS_V4_2
> +	help
> +	  This option enables support for NFSv4.2 inter server to
> +	  server copy where the destination server calls the NFSv4.2
> +	  client to read the data to copy from the source server.
> +
> +	  If unsure, say N.
> +
>  config NFSD_V4_SECURITY_LABEL
>  	bool "Provide Security Label support for NFSv4 server"
>  	depends on NFSD_V4 && SECURITY
> diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
> index 8c2273e..1039528 100644
> --- a/fs/nfsd/nfs4proc.c
> +++ b/fs/nfsd/nfs4proc.c
> @@ -504,12 +504,20 @@ static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_stat
>  	    union nfsd4_op_u *u)
>  {
>  	struct nfsd4_putfh *putfh = &u->putfh;
> +	__be32 ret;
>  
>  	fh_put(&cstate->current_fh);
>  	cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
>  	memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
>  	       putfh->pf_fhlen);
> -	return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
> +	ret = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
> +#ifdef CONFIG_NFSD_V4_2_INTER_SSC
> +	if (ret == nfserr_stale && putfh->no_verify) {
> +		SET_FH_FLAG(&cstate->current_fh, NFSD4_FH_FOREIGN);
> +		ret = 0;
> +	}
> +#endif
> +	return ret;
>  }
>  
>  static __be32
> @@ -1956,6 +1964,41 @@ static void svcxdr_init_encode(struct svc_rqst *rqstp,
>  		- rqstp->rq_auth_slack;
>  }
>  
> +#ifdef CONFIG_NFSD_V4_2_INTER_SSC
> +static void
> +check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
> +{
> +	struct nfsd4_op	*op, *current_op, *saved_op;
> +	struct nfsd4_copy *copy;
> +	struct nfsd4_putfh *putfh;
> +	int i;
> +
> +	/* traverse all operation and if it's a COPY compound, mark the
> +	 * source filehandle to skip verification
> +	 */
> +	for (i = 0; i < args->opcnt; i++) {
> +		op = &args->ops[i];
> +		if (op->opnum == OP_PUTFH)
> +			current_op = op;
> +		else if (op->opnum == OP_SAVEFH)
> +			saved_op = current_op;
> +		else if (op->opnum == OP_RESTOREFH)
> +			current_op = saved_op;
> +		else if (op->opnum == OP_COPY) {
> +			copy = (struct nfsd4_copy *)&op->u;
> +			putfh = (struct nfsd4_putfh *)&saved_op->u;
> +			if (!copy->cp_intra)
> +				putfh->no_verify = true;

Won't this crash on a compound with a COPY but no preceding PUTFH and
SAVEFH?  Or is that checked elsewhere?  I was expecting a check in that
last clause like

	if (!saved_op)
		/* return some error */
		/* or just continue and let nfsd4_copy catch the error */

--b.

> +		}
> +	}
> +}
> +#else
> +static void
> +check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
> +{
> +}
> +#endif
> +
>  /*
>   * COMPOUND call.
>   */
> @@ -2004,6 +2047,7 @@ static void svcxdr_init_encode(struct svc_rqst *rqstp,
>  		resp->opcnt = 1;
>  		goto encode_op;
>  	}
> +	check_if_stalefh_allowed(args);
>  
>  	trace_nfsd_compound(rqstp, args->opcnt);
>  	while (!status && resp->opcnt < args->opcnt) {
> @@ -2019,13 +2063,14 @@ static void svcxdr_init_encode(struct svc_rqst *rqstp,
>  				op->status = nfsd4_open_omfg(rqstp, cstate, op);
>  			goto encode_op;
>  		}
> -
> -		if (!current_fh->fh_dentry) {
> +		if (!current_fh->fh_dentry &&
> +				!HAS_FH_FLAG(current_fh, NFSD4_FH_FOREIGN)) {
>  			if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
>  				op->status = nfserr_nofilehandle;
>  				goto encode_op;
>  			}
> -		} else if (current_fh->fh_export->ex_fslocs.migrated &&
> +		} else if (current_fh->fh_export &&
> +			   current_fh->fh_export->ex_fslocs.migrated &&
>  			  !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
>  			op->status = nfserr_moved;
>  			goto encode_op;
> diff --git a/fs/nfsd/nfsfh.h b/fs/nfsd/nfsfh.h
> index 755e256..b9c7568 100644
> --- a/fs/nfsd/nfsfh.h
> +++ b/fs/nfsd/nfsfh.h
> @@ -35,7 +35,7 @@ static inline ino_t u32_to_ino_t(__u32 uino)
>  
>  	bool			fh_locked;	/* inode locked by us */
>  	bool			fh_want_write;	/* remount protection taken */
> -
> +	int			fh_flags;	/* FH flags */
>  #ifdef CONFIG_NFSD_V3
>  	bool			fh_post_saved;	/* post-op attrs saved */
>  	bool			fh_pre_saved;	/* pre-op attrs saved */
> @@ -56,6 +56,9 @@ static inline ino_t u32_to_ino_t(__u32 uino)
>  #endif /* CONFIG_NFSD_V3 */
>  
>  } svc_fh;
> +#define NFSD4_FH_FOREIGN (1<<0)
> +#define SET_FH_FLAG(c, f) ((c)->fh_flags |= (f))
> +#define HAS_FH_FLAG(c, f) ((c)->fh_flags & (f))
>  
>  enum nfsd_fsid {
>  	FSID_DEV = 0,
> diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
> index 9d7318c..fbd18d6 100644
> --- a/fs/nfsd/xdr4.h
> +++ b/fs/nfsd/xdr4.h
> @@ -221,6 +221,7 @@ struct nfsd4_lookup {
>  struct nfsd4_putfh {
>  	u32		pf_fhlen;           /* request */
>  	char		*pf_fhval;          /* request */
> +	bool		no_verify;	    /* represents foreigh fh */
>  };
>  
>  struct nfsd4_open {
> -- 
> 1.8.3.1
Olga Kornievskaia July 30, 2019, 3:48 p.m. UTC | #2
On Tue, Jul 23, 2019 at 5:35 PM J. Bruce Fields <bfields@fieldses.org> wrote:
>
> On Mon, Jul 08, 2019 at 03:23:51PM -0400, Olga Kornievskaia wrote:
> > The inter server to server COPY source server filehandle
> > is a foreign filehandle as the COPY is sent to the destination
> > server.
> >
> > Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
> > ---
> >  fs/nfsd/Kconfig    | 10 ++++++++++
> >  fs/nfsd/nfs4proc.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++----
> >  fs/nfsd/nfsfh.h    |  5 ++++-
> >  fs/nfsd/xdr4.h     |  1 +
> >  4 files changed, 64 insertions(+), 5 deletions(-)
> >
> > diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig
> > index d25f6bb..bef3a58 100644
> > --- a/fs/nfsd/Kconfig
> > +++ b/fs/nfsd/Kconfig
> > @@ -132,6 +132,16 @@ config NFSD_FLEXFILELAYOUT
> >
> >         If unsure, say N.
> >
> > +config NFSD_V4_2_INTER_SSC
> > +     bool "NFSv4.2 inter server to server COPY"
> > +     depends on NFSD_V4 && NFS_V4_1 && NFS_V4_2
> > +     help
> > +       This option enables support for NFSv4.2 inter server to
> > +       server copy where the destination server calls the NFSv4.2
> > +       client to read the data to copy from the source server.
> > +
> > +       If unsure, say N.
> > +
> >  config NFSD_V4_SECURITY_LABEL
> >       bool "Provide Security Label support for NFSv4 server"
> >       depends on NFSD_V4 && SECURITY
> > diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
> > index 8c2273e..1039528 100644
> > --- a/fs/nfsd/nfs4proc.c
> > +++ b/fs/nfsd/nfs4proc.c
> > @@ -504,12 +504,20 @@ static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_stat
> >           union nfsd4_op_u *u)
> >  {
> >       struct nfsd4_putfh *putfh = &u->putfh;
> > +     __be32 ret;
> >
> >       fh_put(&cstate->current_fh);
> >       cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
> >       memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
> >              putfh->pf_fhlen);
> > -     return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
> > +     ret = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
> > +#ifdef CONFIG_NFSD_V4_2_INTER_SSC
> > +     if (ret == nfserr_stale && putfh->no_verify) {
> > +             SET_FH_FLAG(&cstate->current_fh, NFSD4_FH_FOREIGN);
> > +             ret = 0;
> > +     }
> > +#endif
> > +     return ret;
> >  }
> >
> >  static __be32
> > @@ -1956,6 +1964,41 @@ static void svcxdr_init_encode(struct svc_rqst *rqstp,
> >               - rqstp->rq_auth_slack;
> >  }
> >
> > +#ifdef CONFIG_NFSD_V4_2_INTER_SSC
> > +static void
> > +check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
> > +{
> > +     struct nfsd4_op *op, *current_op, *saved_op;
> > +     struct nfsd4_copy *copy;
> > +     struct nfsd4_putfh *putfh;
> > +     int i;
> > +
> > +     /* traverse all operation and if it's a COPY compound, mark the
> > +      * source filehandle to skip verification
> > +      */
> > +     for (i = 0; i < args->opcnt; i++) {
> > +             op = &args->ops[i];
> > +             if (op->opnum == OP_PUTFH)
> > +                     current_op = op;
> > +             else if (op->opnum == OP_SAVEFH)
> > +                     saved_op = current_op;
> > +             else if (op->opnum == OP_RESTOREFH)
> > +                     current_op = saved_op;
> > +             else if (op->opnum == OP_COPY) {
> > +                     copy = (struct nfsd4_copy *)&op->u;
> > +                     putfh = (struct nfsd4_putfh *)&saved_op->u;
> > +                     if (!copy->cp_intra)
> > +                             putfh->no_verify = true;
>
> Won't this crash on a compound with a COPY but no preceding PUTFH and
> SAVEFH?  Or is that checked elsewhere?  I was expecting a check in that
> last clause like

Yes it will crash. I will check and return ERR_NOFILEHANDLE if no
filehandle was stored.


>
>         if (!saved_op)
>                 /* return some error */
>                 /* or just continue and let nfsd4_copy catch the error */
>
> --b.
>
> > +             }
> > +     }
> > +}
> > +#else
> > +static void
> > +check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
> > +{
> > +}
> > +#endif
> > +
> >  /*
> >   * COMPOUND call.
> >   */
> > @@ -2004,6 +2047,7 @@ static void svcxdr_init_encode(struct svc_rqst *rqstp,
> >               resp->opcnt = 1;
> >               goto encode_op;
> >       }
> > +     check_if_stalefh_allowed(args);
> >
> >       trace_nfsd_compound(rqstp, args->opcnt);
> >       while (!status && resp->opcnt < args->opcnt) {
> > @@ -2019,13 +2063,14 @@ static void svcxdr_init_encode(struct svc_rqst *rqstp,
> >                               op->status = nfsd4_open_omfg(rqstp, cstate, op);
> >                       goto encode_op;
> >               }
> > -
> > -             if (!current_fh->fh_dentry) {
> > +             if (!current_fh->fh_dentry &&
> > +                             !HAS_FH_FLAG(current_fh, NFSD4_FH_FOREIGN)) {
> >                       if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
> >                               op->status = nfserr_nofilehandle;
> >                               goto encode_op;
> >                       }
> > -             } else if (current_fh->fh_export->ex_fslocs.migrated &&
> > +             } else if (current_fh->fh_export &&
> > +                        current_fh->fh_export->ex_fslocs.migrated &&
> >                         !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
> >                       op->status = nfserr_moved;
> >                       goto encode_op;
> > diff --git a/fs/nfsd/nfsfh.h b/fs/nfsd/nfsfh.h
> > index 755e256..b9c7568 100644
> > --- a/fs/nfsd/nfsfh.h
> > +++ b/fs/nfsd/nfsfh.h
> > @@ -35,7 +35,7 @@ static inline ino_t u32_to_ino_t(__u32 uino)
> >
> >       bool                    fh_locked;      /* inode locked by us */
> >       bool                    fh_want_write;  /* remount protection taken */
> > -
> > +     int                     fh_flags;       /* FH flags */
> >  #ifdef CONFIG_NFSD_V3
> >       bool                    fh_post_saved;  /* post-op attrs saved */
> >       bool                    fh_pre_saved;   /* pre-op attrs saved */
> > @@ -56,6 +56,9 @@ static inline ino_t u32_to_ino_t(__u32 uino)
> >  #endif /* CONFIG_NFSD_V3 */
> >
> >  } svc_fh;
> > +#define NFSD4_FH_FOREIGN (1<<0)
> > +#define SET_FH_FLAG(c, f) ((c)->fh_flags |= (f))
> > +#define HAS_FH_FLAG(c, f) ((c)->fh_flags & (f))
> >
> >  enum nfsd_fsid {
> >       FSID_DEV = 0,
> > diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
> > index 9d7318c..fbd18d6 100644
> > --- a/fs/nfsd/xdr4.h
> > +++ b/fs/nfsd/xdr4.h
> > @@ -221,6 +221,7 @@ struct nfsd4_lookup {
> >  struct nfsd4_putfh {
> >       u32             pf_fhlen;           /* request */
> >       char            *pf_fhval;          /* request */
> > +     bool            no_verify;          /* represents foreigh fh */
> >  };
> >
> >  struct nfsd4_open {
> > --
> > 1.8.3.1

Patch
diff mbox series

diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig
index d25f6bb..bef3a58 100644
--- a/fs/nfsd/Kconfig
+++ b/fs/nfsd/Kconfig
@@ -132,6 +132,16 @@  config NFSD_FLEXFILELAYOUT
 
 	  If unsure, say N.
 
+config NFSD_V4_2_INTER_SSC
+	bool "NFSv4.2 inter server to server COPY"
+	depends on NFSD_V4 && NFS_V4_1 && NFS_V4_2
+	help
+	  This option enables support for NFSv4.2 inter server to
+	  server copy where the destination server calls the NFSv4.2
+	  client to read the data to copy from the source server.
+
+	  If unsure, say N.
+
 config NFSD_V4_SECURITY_LABEL
 	bool "Provide Security Label support for NFSv4 server"
 	depends on NFSD_V4 && SECURITY
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 8c2273e..1039528 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -504,12 +504,20 @@  static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_stat
 	    union nfsd4_op_u *u)
 {
 	struct nfsd4_putfh *putfh = &u->putfh;
+	__be32 ret;
 
 	fh_put(&cstate->current_fh);
 	cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 	memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 	       putfh->pf_fhlen);
-	return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
+	ret = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
+#ifdef CONFIG_NFSD_V4_2_INTER_SSC
+	if (ret == nfserr_stale && putfh->no_verify) {
+		SET_FH_FLAG(&cstate->current_fh, NFSD4_FH_FOREIGN);
+		ret = 0;
+	}
+#endif
+	return ret;
 }
 
 static __be32
@@ -1956,6 +1964,41 @@  static void svcxdr_init_encode(struct svc_rqst *rqstp,
 		- rqstp->rq_auth_slack;
 }
 
+#ifdef CONFIG_NFSD_V4_2_INTER_SSC
+static void
+check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
+{
+	struct nfsd4_op	*op, *current_op, *saved_op;
+	struct nfsd4_copy *copy;
+	struct nfsd4_putfh *putfh;
+	int i;
+
+	/* traverse all operation and if it's a COPY compound, mark the
+	 * source filehandle to skip verification
+	 */
+	for (i = 0; i < args->opcnt; i++) {
+		op = &args->ops[i];
+		if (op->opnum == OP_PUTFH)
+			current_op = op;
+		else if (op->opnum == OP_SAVEFH)
+			saved_op = current_op;
+		else if (op->opnum == OP_RESTOREFH)
+			current_op = saved_op;
+		else if (op->opnum == OP_COPY) {
+			copy = (struct nfsd4_copy *)&op->u;
+			putfh = (struct nfsd4_putfh *)&saved_op->u;
+			if (!copy->cp_intra)
+				putfh->no_verify = true;
+		}
+	}
+}
+#else
+static void
+check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
+{
+}
+#endif
+
 /*
  * COMPOUND call.
  */
@@ -2004,6 +2047,7 @@  static void svcxdr_init_encode(struct svc_rqst *rqstp,
 		resp->opcnt = 1;
 		goto encode_op;
 	}
+	check_if_stalefh_allowed(args);
 
 	trace_nfsd_compound(rqstp, args->opcnt);
 	while (!status && resp->opcnt < args->opcnt) {
@@ -2019,13 +2063,14 @@  static void svcxdr_init_encode(struct svc_rqst *rqstp,
 				op->status = nfsd4_open_omfg(rqstp, cstate, op);
 			goto encode_op;
 		}
-
-		if (!current_fh->fh_dentry) {
+		if (!current_fh->fh_dentry &&
+				!HAS_FH_FLAG(current_fh, NFSD4_FH_FOREIGN)) {
 			if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
 				op->status = nfserr_nofilehandle;
 				goto encode_op;
 			}
-		} else if (current_fh->fh_export->ex_fslocs.migrated &&
+		} else if (current_fh->fh_export &&
+			   current_fh->fh_export->ex_fslocs.migrated &&
 			  !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
 			op->status = nfserr_moved;
 			goto encode_op;
diff --git a/fs/nfsd/nfsfh.h b/fs/nfsd/nfsfh.h
index 755e256..b9c7568 100644
--- a/fs/nfsd/nfsfh.h
+++ b/fs/nfsd/nfsfh.h
@@ -35,7 +35,7 @@  static inline ino_t u32_to_ino_t(__u32 uino)
 
 	bool			fh_locked;	/* inode locked by us */
 	bool			fh_want_write;	/* remount protection taken */
-
+	int			fh_flags;	/* FH flags */
 #ifdef CONFIG_NFSD_V3
 	bool			fh_post_saved;	/* post-op attrs saved */
 	bool			fh_pre_saved;	/* pre-op attrs saved */
@@ -56,6 +56,9 @@  static inline ino_t u32_to_ino_t(__u32 uino)
 #endif /* CONFIG_NFSD_V3 */
 
 } svc_fh;
+#define NFSD4_FH_FOREIGN (1<<0)
+#define SET_FH_FLAG(c, f) ((c)->fh_flags |= (f))
+#define HAS_FH_FLAG(c, f) ((c)->fh_flags & (f))
 
 enum nfsd_fsid {
 	FSID_DEV = 0,
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index 9d7318c..fbd18d6 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -221,6 +221,7 @@  struct nfsd4_lookup {
 struct nfsd4_putfh {
 	u32		pf_fhlen;           /* request */
 	char		*pf_fhval;          /* request */
+	bool		no_verify;	    /* represents foreigh fh */
 };
 
 struct nfsd4_open {