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[PATCH v9 38/43] sunrpc: Add xdr_init_encode_pages

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Initialize xdr_stream and xdr_buf from a pages array, for encoding into
the pages.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
 include/linux/sunrpc/xdr.h |  2 ++
 net/sunrpc/xdr.c           | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h
index 70c6b92..2c99cff 100644
--- a/include/linux/sunrpc/xdr.h
+++ b/include/linux/sunrpc/xdr.h
@@ -214,6 +214,8 @@ typedef void	(*kxdreproc_t)(void *rqstp, struct xdr_stream *xdr, void *obj);
 typedef int	(*kxdrdproc_t)(void *rqstp, struct xdr_stream *xdr, void *obj);
 
 extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p);
+extern void xdr_init_encode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,
+				  struct page **pages, unsigned int len);
 extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes);
 extern void xdr_commit_encode(struct xdr_stream *xdr);
 extern void xdr_truncate_encode(struct xdr_stream *xdr, size_t len);
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index 63c1c36..f97b96b 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -483,6 +483,31 @@ void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p)
 EXPORT_SYMBOL_GPL(xdr_init_encode);
 
 /**
+ * xdr_init_encode_pages - Initialize struct xdr_stream for encoding into pages
+ * @xdr: pointer to xdr_stream struct
+ * @buf: pointer to XDR buffer in which to encode data
+ * @pages: pages array in which to encode
+ * @len: maximum length of @buf
+ *
+ * Initialize @xdr and @buf for encoding into the @pages array.  If a
+ * page in @pages is NULL, it will be allocated on demand.
+ */
+void xdr_init_encode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,
+			   struct page **pages, unsigned int len)
+{
+	memset(buf, 0, sizeof(*buf));
+	buf->pages = pages;
+	buf->page_len = len;
+	buf->buflen = len;
+
+	memset(xdr, 0, sizeof(*xdr));
+	xdr->buf = buf;
+	xdr->iov = buf->head;
+	xdr->page_ptr = pages - 1;
+}
+EXPORT_SYMBOL_GPL(xdr_init_encode_pages);
+
+/**
  * xdr_commit_encode - Ensure all data is written to buffer
  * @xdr: pointer to xdr_stream
  *
-- 
2.5.0

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[PATCH v9 00/43] Richacls Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 21:40 +0200
  [PATCH v9 22/43] richacl: acl editing helper functions Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 21:40 +0200
  [PATCH v9 12/43] vfs: Cache richacl in struct inode Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 21:40 +0200
  [PATCH v9 38/43] sunrpc: Add xdr_init_encode_pages Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 21:50 +0200
  [PATCH v9 42/43] nfs: Add support for the v4.1 dacl attribute Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 21:50 +0200
  [PATCH v9 34/43] nfsd: Add support for the MAY_CREATE_{FILE,DIR} permissions Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 21:50 +0200
  [PATCH v9 35/43] richacl: Add support for unmapped identifiers Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 21:50 +0200
  [PATCH v9 28/43] richacl: Apply the file masks to a richacl Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 21:50 +0200
  [PATCH v9 39/43] nfs: Fix GETATTR bitmap verification Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 21:50 +0200
  [PATCH v9 37/43] sunrpc: Allow to demand-allocate pages to encode into Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 21:50 +0200
  [PATCH v9 36/43] ext4: Don't allow unmapped identifiers in richacls Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 21:50 +0200
  [PATCH v9 40/43] nfs: Remove unused xdr page offsets in getacl/setacl arguments Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 21:50 +0200
  [PATCH v9 41/43] nfs: Add richacl support Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 21:50 +0200
  [PATCH v9 31/43] nfsd: Use richacls as internal acl representation Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 21:50 +0200
  [PATCH v9 30/43] nfsd: Keep list of acls to dispose of in compoundargs Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 21:50 +0200
  [PATCH v9 43/43] richacl: uapi header split Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 21:50 +0200
  [PATCH v9 33/43] nfsd: Add support for the v4.1 dacl attribute Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 21:50 +0200
  [PATCH v9 32/43] nfsd: Add richacl support Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 22:00 +0200
  [PATCH v9 29/43] richacl: Create richacl from mode values Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 22:00 +0200
  [PATCH v9 11/43] vfs: Add get_richacl and set_richacl inode operations Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 22:10 +0200
  [PATCH v9 21/43] ext4: Add richacl feature flag Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 22:10 +0200
  [PATCH v9 07/43] richacl: Permission mapping functions Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 22:20 +0200
  [PATCH v9 02/43] vfs: Add MAY_CREATE_FILE and MAY_CREATE_DIR permission flags Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-05 22:20 +0200
  Re: [PATCH v9 00/43] Richacls Pavel Machek <pavel@ucw.cz> - 2015-10-06 11:10 +0200
    Re: [PATCH v9 00/43] Richacls Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-06 14:50 +0200
      Re: [PATCH v9 00/43] Richacls James Morris <jmorris@namei.org> - 2015-10-07 09:40 +0200
        Re: [PATCH v9 00/43] Richacls Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-10-07 15:30 +0200
        Re: [PATCH v9 00/43] Richacls Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-07 15:50 +0200

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