--- /dev/null
+/*
+ * linux/net/sunrpc/xdr.c
+ *
+ * Generic XDR support.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/pagemap.h>
+#include <linux/errno.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/msg_prot.h>
+
+/*
+ * XDR functions for basic NFS types
+ */
+__be32 *
+xdr_encode_netobj(__be32 *p, const struct xdr_netobj *obj)
+{
+ unsigned int quadlen = XDR_QUADLEN(obj->len);
+
+ p[quadlen] = 0; /* zero trailing bytes */
+ *p++ = cpu_to_be32(obj->len);
+ memcpy(p, obj->data, obj->len);
+ return p + XDR_QUADLEN(obj->len);
+}
+EXPORT_SYMBOL_GPL(xdr_encode_netobj);
+
+__be32 *
+xdr_decode_netobj(__be32 *p, struct xdr_netobj *obj)
+{
+ unsigned int len;
+
+ if ((len = be32_to_cpu(*p++)) > XDR_MAX_NETOBJ)
+ return NULL;
+ obj->len = len;
+ obj->data = (u8 *) p;
+ return p + XDR_QUADLEN(len);
+}
+EXPORT_SYMBOL_GPL(xdr_decode_netobj);
+
+/**
+ * xdr_encode_opaque_fixed - Encode fixed length opaque data
+ * @p: pointer to current position in XDR buffer.
+ * @ptr: pointer to data to encode (or NULL)
+ * @nbytes: size of data.
+ *
+ * Copy the array of data of length nbytes at ptr to the XDR buffer
+ * at position p, then align to the next 32-bit boundary by padding
+ * with zero bytes (see RFC1832).
+ * Note: if ptr is NULL, only the padding is performed.
+ *
+ * Returns the updated current XDR buffer position
+ *
+ */
+__be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int nbytes)
+{
+ if (likely(nbytes != 0)) {
+ unsigned int quadlen = XDR_QUADLEN(nbytes);
+ unsigned int padding = (quadlen << 2) - nbytes;
+
+ if (ptr != NULL)
+ memcpy(p, ptr, nbytes);
+ if (padding != 0)
+ memset((char *)p + nbytes, 0, padding);
+ p += quadlen;
+ }
+ return p;
+}
+EXPORT_SYMBOL_GPL(xdr_encode_opaque_fixed);
+
+/**
+ * xdr_encode_opaque - Encode variable length opaque data
+ * @p: pointer to current position in XDR buffer.
+ * @ptr: pointer to data to encode (or NULL)
+ * @nbytes: size of data.
+ *
+ * Returns the updated current XDR buffer position
+ */
+__be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int nbytes)
+{
+ *p++ = cpu_to_be32(nbytes);
+ return xdr_encode_opaque_fixed(p, ptr, nbytes);
+}
+EXPORT_SYMBOL_GPL(xdr_encode_opaque);
+
+__be32 *
+xdr_encode_string(__be32 *p, const char *string)
+{
+ return xdr_encode_array(p, string, strlen(string));
+}
+EXPORT_SYMBOL_GPL(xdr_encode_string);
+
+__be32 *
+xdr_decode_string_inplace(__be32 *p, char **sp,
+ unsigned int *lenp, unsigned int maxlen)
+{
+ u32 len;
+
+ len = be32_to_cpu(*p++);
+ if (len > maxlen)
+ return NULL;
+ *lenp = len;
+ *sp = (char *) p;
+ return p + XDR_QUADLEN(len);
+}
+EXPORT_SYMBOL_GPL(xdr_decode_string_inplace);
+
+/**
+ * xdr_terminate_string - '\0'-terminate a string residing in an xdr_buf
+ * @buf: XDR buffer where string resides
+ * @len: length of string, in bytes
+ *
+ */
+void
+xdr_terminate_string(struct xdr_buf *buf, const u32 len)
+{
+ char *kaddr;
+
+ kaddr = kmap_atomic(buf->pages[0]);
+ kaddr[buf->page_base + len] = '\0';
+ kunmap_atomic(kaddr);
+}
+EXPORT_SYMBOL_GPL(xdr_terminate_string);
+
+void
+xdr_inline_pages(struct xdr_buf *xdr, unsigned int offset,
+ struct page **pages, unsigned int base, unsigned int len)
+{
+ struct kvec *head = xdr->head;
+ struct kvec *tail = xdr->tail;
+ char *buf = (char *)head->iov_base;
+ unsigned int buflen = head->iov_len;
+
+ head->iov_len = offset;
+
+ xdr->pages = pages;
+ xdr->page_base = base;
+ xdr->page_len = len;
+
+ tail->iov_base = buf + offset;
+ tail->iov_len = buflen - offset;
+
+ xdr->buflen += len;
+}
+EXPORT_SYMBOL_GPL(xdr_inline_pages);
+
+/*
+ * Helper routines for doing 'memmove' like operations on a struct xdr_buf
+ */
+
+/**
+ * _shift_data_right_pages
+ * @pages: vector of pages containing both the source and dest memory area.
+ * @pgto_base: page vector address of destination
+ * @pgfrom_base: page vector address of source
+ * @len: number of bytes to copy
+ *
+ * Note: the addresses pgto_base and pgfrom_base are both calculated in
+ * the same way:
+ * if a memory area starts at byte 'base' in page 'pages[i]',
+ * then its address is given as (i << PAGE_CACHE_SHIFT) + base
+ * Also note: pgfrom_base must be < pgto_base, but the memory areas
+ * they point to may overlap.
+ */
+static void
+_shift_data_right_pages(struct page **pages, size_t pgto_base,
+ size_t pgfrom_base, size_t len)
+{
+ struct page **pgfrom, **pgto;
+ char *vfrom, *vto;
+ size_t copy;
+
+ BUG_ON(pgto_base <= pgfrom_base);
+
+ pgto_base += len;
+ pgfrom_base += len;
+
+ pgto = pages + (pgto_base >> PAGE_CACHE_SHIFT);
+ pgfrom = pages + (pgfrom_base >> PAGE_CACHE_SHIFT);
+
+ pgto_base &= ~PAGE_CACHE_MASK;
+ pgfrom_base &= ~PAGE_CACHE_MASK;
+
+ do {
+ /* Are any pointers crossing a page boundary? */
+ if (pgto_base == 0) {
+ pgto_base = PAGE_CACHE_SIZE;
+ pgto--;
+ }
+ if (pgfrom_base == 0) {
+ pgfrom_base = PAGE_CACHE_SIZE;
+ pgfrom--;
+ }
+
+ copy = len;
+ if (copy > pgto_base)
+ copy = pgto_base;
+ if (copy > pgfrom_base)
+ copy = pgfrom_base;
+ pgto_base -= copy;
+ pgfrom_base -= copy;
+
+ vto = kmap_atomic(*pgto);
+ if (*pgto != *pgfrom) {
+ vfrom = kmap_atomic(*pgfrom);
+ memcpy(vto + pgto_base, vfrom + pgfrom_base, copy);
+ kunmap_atomic(vfrom);
+ } else
+ memmove(vto + pgto_base, vto + pgfrom_base, copy);
+ flush_dcache_page(*pgto);
+ kunmap_atomic(vto);
+
+ } while ((len -= copy) != 0);
+}
+
+/**
+ * _copy_to_pages
+ * @pages: array of pages
+ * @pgbase: page vector address of destination
+ * @p: pointer to source data
+ * @len: length
+ *
+ * Copies data from an arbitrary memory location into an array of pages
+ * The copy is assumed to be non-overlapping.
+ */
+static void
+_copy_to_pages(struct page **pages, size_t pgbase, const char *p, size_t len)
+{
+ struct page **pgto;
+ char *vto;
+ size_t copy;
+
+ pgto = pages + (pgbase >> PAGE_CACHE_SHIFT);
+ pgbase &= ~PAGE_CACHE_MASK;
+
+ for (;;) {
+ copy = PAGE_CACHE_SIZE - pgbase;
+ if (copy > len)
+ copy = len;
+
+ vto = kmap_atomic(*pgto);
+ memcpy(vto + pgbase, p, copy);
+ kunmap_atomic(vto);
+
+ len -= copy;
+ if (len == 0)
+ break;
+
+ pgbase += copy;
+ if (pgbase == PAGE_CACHE_SIZE) {
+ flush_dcache_page(*pgto);
+ pgbase = 0;
+ pgto++;
+ }
+ p += copy;
+ }
+ flush_dcache_page(*pgto);
+}
+
+/**
+ * _copy_from_pages
+ * @p: pointer to destination
+ * @pages: array of pages
+ * @pgbase: offset of source data
+ * @len: length
+ *
+ * Copies data into an arbitrary memory location from an array of pages
+ * The copy is assumed to be non-overlapping.
+ */
+void
+_copy_from_pages(char *p, struct page **pages, size_t pgbase, size_t len)
+{
+ struct page **pgfrom;
+ char *vfrom;
+ size_t copy;
+
+ pgfrom = pages + (pgbase >> PAGE_CACHE_SHIFT);
+ pgbase &= ~PAGE_CACHE_MASK;
+
+ do {
+ copy = PAGE_CACHE_SIZE - pgbase;
+ if (copy > len)
+ copy = len;
+
+ vfrom = kmap_atomic(*pgfrom);
+ memcpy(p, vfrom + pgbase, copy);
+ kunmap_atomic(vfrom);
+
+ pgbase += copy;
+ if (pgbase == PAGE_CACHE_SIZE) {
+ pgbase = 0;
+ pgfrom++;
+ }
+ p += copy;
+
+ } while ((len -= copy) != 0);
+}
+EXPORT_SYMBOL_GPL(_copy_from_pages);
+
+/**
+ * xdr_shrink_bufhead
+ * @buf: xdr_buf
+ * @len: bytes to remove from buf->head[0]
+ *
+ * Shrinks XDR buffer's header kvec buf->head[0] by
+ * 'len' bytes. The extra data is not lost, but is instead
+ * moved into the inlined pages and/or the tail.
+ */
+static void
+xdr_shrink_bufhead(struct xdr_buf *buf, size_t len)
+{
+ struct kvec *head, *tail;
+ size_t copy, offs;
+ unsigned int pglen = buf->page_len;
+
+ tail = buf->tail;
+ head = buf->head;
+
+ WARN_ON_ONCE(len > head->iov_len);
+ if (len > head->iov_len)
+ len = head->iov_len;
+
+ /* Shift the tail first */
+ if (tail->iov_len != 0) {
+ if (tail->iov_len > len) {
+ copy = tail->iov_len - len;
+ memmove((char *)tail->iov_base + len,
+ tail->iov_base, copy);
+ }
+ /* Copy from the inlined pages into the tail */
+ copy = len;
+ if (copy > pglen)
+ copy = pglen;
+ offs = len - copy;
+ if (offs >= tail->iov_len)
+ copy = 0;
+ else if (copy > tail->iov_len - offs)
+ copy = tail->iov_len - offs;
+ if (copy != 0)
+ _copy_from_pages((char *)tail->iov_base + offs,
+ buf->pages,
+ buf->page_base + pglen + offs - len,
+ copy);
+ /* Do we also need to copy data from the head into the tail ? */
+ if (len > pglen) {
+ offs = copy = len - pglen;
+ if (copy > tail->iov_len)
+ copy = tail->iov_len;
+ memcpy(tail->iov_base,
+ (char *)head->iov_base +
+ head->iov_len - offs,
+ copy);
+ }
+ }
+ /* Now handle pages */
+ if (pglen != 0) {
+ if (pglen > len)
+ _shift_data_right_pages(buf->pages,
+ buf->page_base + len,
+ buf->page_base,
+ pglen - len);
+ copy = len;
+ if (len > pglen)
+ copy = pglen;
+ _copy_to_pages(buf->pages, buf->page_base,
+ (char *)head->iov_base + head->iov_len - len,
+ copy);
+ }
+ head->iov_len -= len;
+ buf->buflen -= len;
+ /* Have we truncated the message? */
+ if (buf->len > buf->buflen)
+ buf->len = buf->buflen;
+}
+
+/**
+ * xdr_shrink_pagelen
+ * @buf: xdr_buf
+ * @len: bytes to remove from buf->pages
+ *
+ * Shrinks XDR buffer's page array buf->pages by
+ * 'len' bytes. The extra data is not lost, but is instead
+ * moved into the tail.
+ */
+static void
+xdr_shrink_pagelen(struct xdr_buf *buf, size_t len)
+{
+ struct kvec *tail;
+ size_t copy;
+ unsigned int pglen = buf->page_len;
+ unsigned int tailbuf_len;
+
+ tail = buf->tail;
+ BUG_ON (len > pglen);
+
+ tailbuf_len = buf->buflen - buf->head->iov_len - buf->page_len;
+
+ /* Shift the tail first */
+ if (tailbuf_len != 0) {
+ unsigned int free_space = tailbuf_len - tail->iov_len;
+
+ if (len < free_space)
+ free_space = len;
+ tail->iov_len += free_space;
+
+ copy = len;
+ if (tail->iov_len > len) {
+ char *p = (char *)tail->iov_base + len;
+ memmove(p, tail->iov_base, tail->iov_len - len);
+ } else
+ copy = tail->iov_len;
+ /* Copy from the inlined pages into the tail */
+ _copy_from_pages((char *)tail->iov_base,
+ buf->pages, buf->page_base + pglen - len,
+ copy);
+ }
+ buf->page_len -= len;
+ buf->buflen -= len;
+ /* Have we truncated the message? */
+ if (buf->len > buf->buflen)
+ buf->len = buf->buflen;
+}
+
+void
+xdr_shift_buf(struct xdr_buf *buf, size_t len)
+{
+ xdr_shrink_bufhead(buf, len);
+}
+EXPORT_SYMBOL_GPL(xdr_shift_buf);
+
+/**
+ * xdr_stream_pos - Return the current offset from the start of the xdr_stream
+ * @xdr: pointer to struct xdr_stream
+ */
+unsigned int xdr_stream_pos(const struct xdr_stream *xdr)
+{
+ return (unsigned int)(XDR_QUADLEN(xdr->buf->len) - xdr->nwords) << 2;
+}
+EXPORT_SYMBOL_GPL(xdr_stream_pos);
+
+/**
+ * xdr_init_encode - Initialize a struct xdr_stream for sending data.
+ * @xdr: pointer to xdr_stream struct
+ * @buf: pointer to XDR buffer in which to encode data
+ * @p: current pointer inside XDR buffer
+ *
+ * Note: at the moment the RPC client only passes the length of our
+ * scratch buffer in the xdr_buf's header kvec. Previously this
+ * meant we needed to call xdr_adjust_iovec() after encoding the
+ * data. With the new scheme, the xdr_stream manages the details
+ * of the buffer length, and takes care of adjusting the kvec
+ * length for us.
+ */
+void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p)
+{
+ struct kvec *iov = buf->head;
+ int scratch_len = buf->buflen - buf->page_len - buf->tail[0].iov_len;
+
+ xdr_set_scratch_buffer(xdr, NULL, 0);
+ BUG_ON(scratch_len < 0);
+ xdr->buf = buf;
+ xdr->iov = iov;
+ xdr->p = (__be32 *)((char *)iov->iov_base + iov->iov_len);
+ xdr->end = (__be32 *)((char *)iov->iov_base + scratch_len);
+ BUG_ON(iov->iov_len > scratch_len);
+
+ if (p != xdr->p && p != NULL) {
+ size_t len;
+
+ BUG_ON(p < xdr->p || p > xdr->end);
+ len = (char *)p - (char *)xdr->p;
+ xdr->p = p;
+ buf->len += len;
+ iov->iov_len += len;
+ }
+}
+EXPORT_SYMBOL_GPL(xdr_init_encode);
+
+/**
+ * xdr_commit_encode - Ensure all data is written to buffer
+ * @xdr: pointer to xdr_stream
+ *
+ * We handle encoding across page boundaries by giving the caller a
+ * temporary location to write to, then later copying the data into
+ * place; xdr_commit_encode does that copying.
+ *
+ * Normally the caller doesn't need to call this directly, as the
+ * following xdr_reserve_space will do it. But an explicit call may be
+ * required at the end of encoding, or any other time when the xdr_buf
+ * data might be read.
+ */
+void xdr_commit_encode(struct xdr_stream *xdr)
+{
+ int shift = xdr->scratch.iov_len;
+ void *page;
+
+ if (shift == 0)
+ return;
+ page = page_address(*xdr->page_ptr);
+ memcpy(xdr->scratch.iov_base, page, shift);
+ memmove(page, page + shift, (void *)xdr->p - page);
+ xdr->scratch.iov_len = 0;
+}
+EXPORT_SYMBOL_GPL(xdr_commit_encode);
+
+static __be32 *xdr_get_next_encode_buffer(struct xdr_stream *xdr,
+ size_t nbytes)
+{
+ static __be32 *p;
+ int space_left;
+ int frag1bytes, frag2bytes;
+
+ if (nbytes > PAGE_SIZE)
+ return NULL; /* Bigger buffers require special handling */
+ if (xdr->buf->len + nbytes > xdr->buf->buflen)
+ return NULL; /* Sorry, we're totally out of space */
+ frag1bytes = (xdr->end - xdr->p) << 2;
+ frag2bytes = nbytes - frag1bytes;
+ if (xdr->iov)
+ xdr->iov->iov_len += frag1bytes;
+ else
+ xdr->buf->page_len += frag1bytes;
+ xdr->page_ptr++;
+ xdr->iov = NULL;
+ /*
+ * If the last encode didn't end exactly on a page boundary, the
+ * next one will straddle boundaries. Encode into the next
+ * page, then copy it back later in xdr_commit_encode. We use
+ * the "scratch" iov to track any temporarily unused fragment of
+ * space at the end of the previous buffer:
+ */
+ xdr->scratch.iov_base = xdr->p;
+ xdr->scratch.iov_len = frag1bytes;
+ p = page_address(*xdr->page_ptr);
+ /*
+ * Note this is where the next encode will start after we've
+ * shifted this one back:
+ */
+ xdr->p = (void *)p + frag2bytes;
+ space_left = xdr->buf->buflen - xdr->buf->len;
+ xdr->end = (void *)p + min_t(int, space_left, PAGE_SIZE);
+ xdr->buf->page_len += frag2bytes;
+ xdr->buf->len += nbytes;
+ return p;
+}
+
+/**
+ * xdr_reserve_space - Reserve buffer space for sending
+ * @xdr: pointer to xdr_stream
+ * @nbytes: number of bytes to reserve
+ *
+ * Checks that we have enough buffer space to encode 'nbytes' more
+ * bytes of data. If so, update the total xdr_buf length, and
+ * adjust the length of the current kvec.
+ */
+__be32 * xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes)
+{
+ __be32 *p = xdr->p;
+ __be32 *q;
+
+ xdr_commit_encode(xdr);
+ /* align nbytes on the next 32-bit boundary */
+ nbytes += 3;
+ nbytes &= ~3;
+ q = p + (nbytes >> 2);
+ if (unlikely(q > xdr->end || q < p))
+ return xdr_get_next_encode_buffer(xdr, nbytes);
+ xdr->p = q;
+ if (xdr->iov)
+ xdr->iov->iov_len += nbytes;
+ else
+ xdr->buf->page_len += nbytes;
+ xdr->buf->len += nbytes;
+ return p;
+}
+EXPORT_SYMBOL_GPL(xdr_reserve_space);
+
+/**
+ * xdr_truncate_encode - truncate an encode buffer
+ * @xdr: pointer to xdr_stream
+ * @len: new length of buffer
+ *
+ * Truncates the xdr stream, so that xdr->buf->len == len,
+ * and xdr->p points at offset len from the start of the buffer, and
+ * head, tail, and page lengths are adjusted to correspond.
+ *
+ * If this means moving xdr->p to a different buffer, we assume that
+ * that the end pointer should be set to the end of the current page,
+ * except in the case of the head buffer when we assume the head
+ * buffer's current length represents the end of the available buffer.
+ *
+ * This is *not* safe to use on a buffer that already has inlined page
+ * cache pages (as in a zero-copy server read reply), except for the
+ * simple case of truncating from one position in the tail to another.
+ *
+ */
+void xdr_truncate_encode(struct xdr_stream *xdr, size_t len)
+{
+ struct xdr_buf *buf = xdr->buf;
+ struct kvec *head = buf->head;
+ struct kvec *tail = buf->tail;
+ int fraglen;
+ int new;
+
+ if (len > buf->len) {
+ WARN_ON_ONCE(1);
+ return;
+ }
+ xdr_commit_encode(xdr);
+
+ fraglen = min_t(int, buf->len - len, tail->iov_len);
+ tail->iov_len -= fraglen;
+ buf->len -= fraglen;
+ if (tail->iov_len) {
+ xdr->p = tail->iov_base + tail->iov_len;
+ WARN_ON_ONCE(!xdr->end);
+ WARN_ON_ONCE(!xdr->iov);
+ return;
+ }
+ WARN_ON_ONCE(fraglen);
+ fraglen = min_t(int, buf->len - len, buf->page_len);
+ buf->page_len -= fraglen;
+ buf->len -= fraglen;
+
+ new = buf->page_base + buf->page_len;
+
+ xdr->page_ptr = buf->pages + (new >> PAGE_SHIFT);
+
+ if (buf->page_len) {
+ xdr->p = page_address(*xdr->page_ptr);
+ xdr->end = (void *)xdr->p + PAGE_SIZE;
+ xdr->p = (void *)xdr->p + (new % PAGE_SIZE);
+ WARN_ON_ONCE(xdr->iov);
+ return;
+ }
+ if (fraglen) {
+ xdr->end = head->iov_base + head->iov_len;
+ xdr->page_ptr--;
+ }
+ /* (otherwise assume xdr->end is already set) */
+ head->iov_len = len;
+ buf->len = len;
+ xdr->p = head->iov_base + head->iov_len;
+ xdr->iov = buf->head;
+}
+EXPORT_SYMBOL(xdr_truncate_encode);
+
+/**
+ * xdr_restrict_buflen - decrease available buffer space
+ * @xdr: pointer to xdr_stream
+ * @newbuflen: new maximum number of bytes available
+ *
+ * Adjust our idea of how much space is available in the buffer.
+ * If we've already used too much space in the buffer, returns -1.
+ * If the available space is already smaller than newbuflen, returns 0
+ * and does nothing. Otherwise, adjusts xdr->buf->buflen to newbuflen
+ * and ensures xdr->end is set at most offset newbuflen from the start
+ * of the buffer.
+ */
+int xdr_restrict_buflen(struct xdr_stream *xdr, int newbuflen)
+{
+ struct xdr_buf *buf = xdr->buf;
+ int left_in_this_buf = (void *)xdr->end - (void *)xdr->p;
+ int end_offset = buf->len + left_in_this_buf;
+
+ if (newbuflen < 0 || newbuflen < buf->len)
+ return -1;
+ if (newbuflen > buf->buflen)
+ return 0;
+ if (newbuflen < end_offset)
+ xdr->end = (void *)xdr->end + newbuflen - end_offset;
+ buf->buflen = newbuflen;
+ return 0;
+}
+EXPORT_SYMBOL(xdr_restrict_buflen);
+
+/**
+ * xdr_write_pages - Insert a list of pages into an XDR buffer for sending
+ * @xdr: pointer to xdr_stream
+ * @pages: list of pages
+ * @base: offset of first byte
+ * @len: length of data in bytes
+ *
+ */
+void xdr_write_pages(struct xdr_stream *xdr, struct page **pages, unsigned int base,
+ unsigned int len)
+{
+ struct xdr_buf *buf = xdr->buf;
+ struct kvec *iov = buf->tail;
+ buf->pages = pages;
+ buf->page_base = base;
+ buf->page_len = len;
+
+ iov->iov_base = (char *)xdr->p;
+ iov->iov_len = 0;
+ xdr->iov = iov;
+
+ if (len & 3) {
+ unsigned int pad = 4 - (len & 3);
+
+ BUG_ON(xdr->p >= xdr->end);
+ iov->iov_base = (char *)xdr->p + (len & 3);
+ iov->iov_len += pad;
+ len += pad;
+ *xdr->p++ = 0;
+ }
+ buf->buflen += len;
+ buf->len += len;
+}
+EXPORT_SYMBOL_GPL(xdr_write_pages);
+
+static void xdr_set_iov(struct xdr_stream *xdr, struct kvec *iov,
+ unsigned int len)
+{
+ if (len > iov->iov_len)
+ len = iov->iov_len;
+ xdr->p = (__be32*)iov->iov_base;
+ xdr->end = (__be32*)(iov->iov_base + len);
+ xdr->iov = iov;
+ xdr->page_ptr = NULL;
+}
+
+static int xdr_set_page_base(struct xdr_stream *xdr,
+ unsigned int base, unsigned int len)
+{
+ unsigned int pgnr;
+ unsigned int maxlen;
+ unsigned int pgoff;
+ unsigned int pgend;
+ void *kaddr;
+
+ maxlen = xdr->buf->page_len;
+ if (base >= maxlen)
+ return -EINVAL;
+ maxlen -= base;
+ if (len > maxlen)
+ len = maxlen;
+
+ base += xdr->buf->page_base;
+
+ pgnr = base >> PAGE_SHIFT;
+ xdr->page_ptr = &xdr->buf->pages[pgnr];
+ kaddr = page_address(*xdr->page_ptr);
+
+ pgoff = base & ~PAGE_MASK;
+ xdr->p = (__be32*)(kaddr + pgoff);
+
+ pgend = pgoff + len;
+ if (pgend > PAGE_SIZE)
+ pgend = PAGE_SIZE;
+ xdr->end = (__be32*)(kaddr + pgend);
+ xdr->iov = NULL;
+ return 0;
+}
+
+static void xdr_set_next_page(struct xdr_stream *xdr)
+{
+ unsigned int newbase;
+
+ newbase = (1 + xdr->page_ptr - xdr->buf->pages) << PAGE_SHIFT;
+ newbase -= xdr->buf->page_base;
+
+ if (xdr_set_page_base(xdr, newbase, PAGE_SIZE) < 0)
+ xdr_set_iov(xdr, xdr->buf->tail, xdr->buf->len);
+}
+
+static bool xdr_set_next_buffer(struct xdr_stream *xdr)
+{
+ if (xdr->page_ptr != NULL)
+ xdr_set_next_page(xdr);
+ else if (xdr->iov == xdr->buf->head) {
+ if (xdr_set_page_base(xdr, 0, PAGE_SIZE) < 0)
+ xdr_set_iov(xdr, xdr->buf->tail, xdr->buf->len);
+ }
+ return xdr->p != xdr->end;
+}
+
+/**
+ * xdr_init_decode - Initialize an xdr_stream for decoding data.
+ * @xdr: pointer to xdr_stream struct
+ * @buf: pointer to XDR buffer from which to decode data
+ * @p: current pointer inside XDR buffer
+ */
+void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p)
+{
+ xdr->buf = buf;
+ xdr->scratch.iov_base = NULL;
+ xdr->scratch.iov_len = 0;
+ xdr->nwords = XDR_QUADLEN(buf->len);
+ if (buf->head[0].iov_len != 0)
+ xdr_set_iov(xdr, buf->head, buf->len);
+ else if (buf->page_len != 0)
+ xdr_set_page_base(xdr, 0, buf->len);
+ if (p != NULL && p > xdr->p && xdr->end >= p) {
+ xdr->nwords -= p - xdr->p;
+ xdr->p = p;
+ }
+}
+EXPORT_SYMBOL_GPL(xdr_init_decode);
+
+/**
+ * xdr_init_decode - Initialize an xdr_stream for decoding data.
+ * @xdr: pointer to xdr_stream struct
+ * @buf: pointer to XDR buffer from which to decode data
+ * @pages: list of pages to decode into
+ * @len: length in bytes of buffer in pages
+ */
+void xdr_init_decode_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;
+ buf->len = len;
+ xdr_init_decode(xdr, buf, NULL);
+}
+EXPORT_SYMBOL_GPL(xdr_init_decode_pages);
+
+static __be32 * __xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes)
+{
+ unsigned int nwords = XDR_QUADLEN(nbytes);
+ __be32 *p = xdr->p;
+ __be32 *q = p + nwords;
+
+ if (unlikely(nwords > xdr->nwords || q > xdr->end || q < p))
+ return NULL;
+ xdr->p = q;
+ xdr->nwords -= nwords;
+ return p;
+}
+
+/**
+ * xdr_set_scratch_buffer - Attach a scratch buffer for decoding data.
+ * @xdr: pointer to xdr_stream struct
+ * @buf: pointer to an empty buffer
+ * @buflen: size of 'buf'
+ *
+ * The scratch buffer is used when decoding from an array of pages.
+ * If an xdr_inline_decode() call spans across page boundaries, then
+ * we copy the data into the scratch buffer in order to allow linear
+ * access.
+ */
+void xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen)
+{
+ xdr->scratch.iov_base = buf;
+ xdr->scratch.iov_len = buflen;
+}
+EXPORT_SYMBOL_GPL(xdr_set_scratch_buffer);
+
+static __be32 *xdr_copy_to_scratch(struct xdr_stream *xdr, size_t nbytes)
+{
+ __be32 *p;
+ void *cpdest = xdr->scratch.iov_base;
+ size_t cplen = (char *)xdr->end - (char *)xdr->p;
+
+ if (nbytes > xdr->scratch.iov_len)
+ return NULL;
+ memcpy(cpdest, xdr->p, cplen);
+ cpdest += cplen;
+ nbytes -= cplen;
+ if (!xdr_set_next_buffer(xdr))
+ return NULL;
+ p = __xdr_inline_decode(xdr, nbytes);
+ if (p == NULL)
+ return NULL;
+ memcpy(cpdest, p, nbytes);
+ return xdr->scratch.iov_base;
+}
+
+/**
+ * xdr_inline_decode - Retrieve XDR data to decode
+ * @xdr: pointer to xdr_stream struct
+ * @nbytes: number of bytes of data to decode
+ *
+ * Check if the input buffer is long enough to enable us to decode
+ * 'nbytes' more bytes of data starting at the current position.
+ * If so return the current pointer, then update the current
+ * pointer position.
+ */
+__be32 * xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes)
+{
+ __be32 *p;
+
+ if (nbytes == 0)
+ return xdr->p;
+ if (xdr->p == xdr->end && !xdr_set_next_buffer(xdr))
+ return NULL;
+ p = __xdr_inline_decode(xdr, nbytes);
+ if (p != NULL)
+ return p;
+ return xdr_copy_to_scratch(xdr, nbytes);
+}
+EXPORT_SYMBOL_GPL(xdr_inline_decode);
+
+static unsigned int xdr_align_pages(struct xdr_stream *xdr, unsigned int len)
+{
+ struct xdr_buf *buf = xdr->buf;
+ struct kvec *iov;
+ unsigned int nwords = XDR_QUADLEN(len);
+ unsigned int cur = xdr_stream_pos(xdr);
+
+ if (xdr->nwords == 0)
+ return 0;
+ /* Realign pages to current pointer position */
+ iov = buf->head;
+ if (iov->iov_len > cur) {
+ xdr_shrink_bufhead(buf, iov->iov_len - cur);
+ xdr->nwords = XDR_QUADLEN(buf->len - cur);
+ }
+
+ if (nwords > xdr->nwords) {
+ nwords = xdr->nwords;
+ len = nwords << 2;
+ }
+ if (buf->page_len <= len)
+ len = buf->page_len;
+ else if (nwords < xdr->nwords) {
+ /* Truncate page data and move it into the tail */
+ xdr_shrink_pagelen(buf, buf->page_len - len);
+ xdr->nwords = XDR_QUADLEN(buf->len - cur);
+ }
+ return len;
+}
+
+/**
+ * xdr_read_pages - Ensure page-based XDR data to decode is aligned at current pointer position
+ * @xdr: pointer to xdr_stream struct
+ * @len: number of bytes of page data
+ *
+ * Moves data beyond the current pointer position from the XDR head[] buffer
+ * into the page list. Any data that lies beyond current position + "len"
+ * bytes is moved into the XDR tail[].
+ *
+ * Returns the number of XDR encoded bytes now contained in the pages
+ */
+unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
+{
+ struct xdr_buf *buf = xdr->buf;
+ struct kvec *iov;
+ unsigned int nwords;
+ unsigned int end;
+ unsigned int padding;
+
+ len = xdr_align_pages(xdr, len);
+ if (len == 0)
+ return 0;
+ nwords = XDR_QUADLEN(len);
+ padding = (nwords << 2) - len;
+ xdr->iov = iov = buf->tail;
+ /* Compute remaining message length. */
+ end = ((xdr->nwords - nwords) << 2) + padding;
+ if (end > iov->iov_len)
+ end = iov->iov_len;
+
+ /*
+ * Position current pointer at beginning of tail, and
+ * set remaining message length.
+ */
+ xdr->p = (__be32 *)((char *)iov->iov_base + padding);
+ xdr->end = (__be32 *)((char *)iov->iov_base + end);
+ xdr->page_ptr = NULL;
+ xdr->nwords = XDR_QUADLEN(end - padding);
+ return len;
+}
+EXPORT_SYMBOL_GPL(xdr_read_pages);
+
+/**
+ * xdr_enter_page - decode data from the XDR page
+ * @xdr: pointer to xdr_stream struct
+ * @len: number of bytes of page data
+ *
+ * Moves data beyond the current pointer position from the XDR head[] buffer
+ * into the page list. Any data that lies beyond current position + "len"
+ * bytes is moved into the XDR tail[]. The current pointer is then
+ * repositioned at the beginning of the first XDR page.
+ */
+void xdr_enter_page(struct xdr_stream *xdr, unsigned int len)
+{
+ len = xdr_align_pages(xdr, len);
+ /*
+ * Position current pointer at beginning of tail, and
+ * set remaining message length.
+ */
+ if (len != 0)
+ xdr_set_page_base(xdr, 0, len);
+}
+EXPORT_SYMBOL_GPL(xdr_enter_page);
+
+static struct kvec empty_iov = {.iov_base = NULL, .iov_len = 0};
+
+void
+xdr_buf_from_iov(struct kvec *iov, struct xdr_buf *buf)
+{
+ buf->head[0] = *iov;
+ buf->tail[0] = empty_iov;
+ buf->page_len = 0;
+ buf->buflen = buf->len = iov->iov_len;
+}
+EXPORT_SYMBOL_GPL(xdr_buf_from_iov);
+
+/**
+ * xdr_buf_subsegment - set subbuf to a portion of buf
+ * @buf: an xdr buffer
+ * @subbuf: the result buffer
+ * @base: beginning of range in bytes
+ * @len: length of range in bytes
+ *
+ * sets @subbuf to an xdr buffer representing the portion of @buf of
+ * length @len starting at offset @base.
+ *
+ * @buf and @subbuf may be pointers to the same struct xdr_buf.
+ *
+ * Returns -1 if base of length are out of bounds.
+ */
+int
+xdr_buf_subsegment(struct xdr_buf *buf, struct xdr_buf *subbuf,
+ unsigned int base, unsigned int len)
+{
+ subbuf->buflen = subbuf->len = len;
+ if (base < buf->head[0].iov_len) {
+ subbuf->head[0].iov_base = buf->head[0].iov_base + base;
+ subbuf->head[0].iov_len = min_t(unsigned int, len,
+ buf->head[0].iov_len - base);
+ len -= subbuf->head[0].iov_len;
+ base = 0;
+ } else {
+ base -= buf->head[0].iov_len;
+ subbuf->head[0].iov_len = 0;
+ }
+
+ if (base < buf->page_len) {
+ subbuf->page_len = min(buf->page_len - base, len);
+ base += buf->page_base;
+ subbuf->page_base = base & ~PAGE_CACHE_MASK;
+ subbuf->pages = &buf->pages[base >> PAGE_CACHE_SHIFT];
+ len -= subbuf->page_len;
+ base = 0;
+ } else {
+ base -= buf->page_len;
+ subbuf->page_len = 0;
+ }
+
+ if (base < buf->tail[0].iov_len) {
+ subbuf->tail[0].iov_base = buf->tail[0].iov_base + base;
+ subbuf->tail[0].iov_len = min_t(unsigned int, len,
+ buf->tail[0].iov_len - base);
+ len -= subbuf->tail[0].iov_len;
+ base = 0;
+ } else {
+ base -= buf->tail[0].iov_len;
+ subbuf->tail[0].iov_len = 0;
+ }
+
+ if (base || len)
+ return -1;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(xdr_buf_subsegment);
+
+/**
+ * xdr_buf_trim - lop at most "len" bytes off the end of "buf"
+ * @buf: buf to be trimmed
+ * @len: number of bytes to reduce "buf" by
+ *
+ * Trim an xdr_buf by the given number of bytes by fixing up the lengths. Note
+ * that it's possible that we'll trim less than that amount if the xdr_buf is
+ * too small, or if (for instance) it's all in the head and the parser has
+ * already read too far into it.
+ */
+void xdr_buf_trim(struct xdr_buf *buf, unsigned int len)
+{
+ size_t cur;
+ unsigned int trim = len;
+
+ if (buf->tail[0].iov_len) {
+ cur = min_t(size_t, buf->tail[0].iov_len, trim);
+ buf->tail[0].iov_len -= cur;
+ trim -= cur;
+ if (!trim)
+ goto fix_len;
+ }
+
+ if (buf->page_len) {
+ cur = min_t(unsigned int, buf->page_len, trim);
+ buf->page_len -= cur;
+ trim -= cur;
+ if (!trim)
+ goto fix_len;
+ }
+
+ if (buf->head[0].iov_len) {
+ cur = min_t(size_t, buf->head[0].iov_len, trim);
+ buf->head[0].iov_len -= cur;
+ trim -= cur;
+ }
+fix_len:
+ buf->len -= (len - trim);
+}
+EXPORT_SYMBOL_GPL(xdr_buf_trim);
+
+static void __read_bytes_from_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len)
+{
+ unsigned int this_len;
+
+ this_len = min_t(unsigned int, len, subbuf->head[0].iov_len);
+ memcpy(obj, subbuf->head[0].iov_base, this_len);
+ len -= this_len;
+ obj += this_len;
+ this_len = min_t(unsigned int, len, subbuf->page_len);
+ if (this_len)
+ _copy_from_pages(obj, subbuf->pages, subbuf->page_base, this_len);
+ len -= this_len;
+ obj += this_len;
+ this_len = min_t(unsigned int, len, subbuf->tail[0].iov_len);
+ memcpy(obj, subbuf->tail[0].iov_base, this_len);
+}
+
+/* obj is assumed to point to allocated memory of size at least len: */
+int read_bytes_from_xdr_buf(struct xdr_buf *buf, unsigned int base, void *obj, unsigned int len)
+{
+ struct xdr_buf subbuf;
+ int status;
+
+ status = xdr_buf_subsegment(buf, &subbuf, base, len);
+ if (status != 0)
+ return status;
+ __read_bytes_from_xdr_buf(&subbuf, obj, len);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(read_bytes_from_xdr_buf);
+
+static void __write_bytes_to_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len)
+{
+ unsigned int this_len;
+
+ this_len = min_t(unsigned int, len, subbuf->head[0].iov_len);
+ memcpy(subbuf->head[0].iov_base, obj, this_len);
+ len -= this_len;
+ obj += this_len;
+ this_len = min_t(unsigned int, len, subbuf->page_len);
+ if (this_len)
+ _copy_to_pages(subbuf->pages, subbuf->page_base, obj, this_len);
+ len -= this_len;
+ obj += this_len;
+ this_len = min_t(unsigned int, len, subbuf->tail[0].iov_len);
+ memcpy(subbuf->tail[0].iov_base, obj, this_len);
+}
+
+/* obj is assumed to point to allocated memory of size at least len: */
+int write_bytes_to_xdr_buf(struct xdr_buf *buf, unsigned int base, void *obj, unsigned int len)
+{
+ struct xdr_buf subbuf;
+ int status;
+
+ status = xdr_buf_subsegment(buf, &subbuf, base, len);
+ if (status != 0)
+ return status;
+ __write_bytes_to_xdr_buf(&subbuf, obj, len);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(write_bytes_to_xdr_buf);
+
+int
+xdr_decode_word(struct xdr_buf *buf, unsigned int base, u32 *obj)
+{
+ __be32 raw;
+ int status;
+
+ status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
+ if (status)
+ return status;
+ *obj = be32_to_cpu(raw);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(xdr_decode_word);
+
+int
+xdr_encode_word(struct xdr_buf *buf, unsigned int base, u32 obj)
+{
+ __be32 raw = cpu_to_be32(obj);
+
+ return write_bytes_to_xdr_buf(buf, base, &raw, sizeof(obj));
+}
+EXPORT_SYMBOL_GPL(xdr_encode_word);
+
+/* If the netobj starting offset bytes from the start of xdr_buf is contained
+ * entirely in the head or the tail, set object to point to it; otherwise
+ * try to find space for it at the end of the tail, copy it there, and
+ * set obj to point to it. */
+int xdr_buf_read_netobj(struct xdr_buf *buf, struct xdr_netobj *obj, unsigned int offset)
+{
+ struct xdr_buf subbuf;
+
+ if (xdr_decode_word(buf, offset, &obj->len))
+ return -EFAULT;
+ if (xdr_buf_subsegment(buf, &subbuf, offset + 4, obj->len))
+ return -EFAULT;
+
+ /* Is the obj contained entirely in the head? */
+ obj->data = subbuf.head[0].iov_base;
+ if (subbuf.head[0].iov_len == obj->len)
+ return 0;
+ /* ..or is the obj contained entirely in the tail? */
+ obj->data = subbuf.tail[0].iov_base;
+ if (subbuf.tail[0].iov_len == obj->len)
+ return 0;
+
+ /* use end of tail as storage for obj:
+ * (We don't copy to the beginning because then we'd have
+ * to worry about doing a potentially overlapping copy.
+ * This assumes the object is at most half the length of the
+ * tail.) */
+ if (obj->len > buf->buflen - buf->len)
+ return -ENOMEM;
+ if (buf->tail[0].iov_len != 0)
+ obj->data = buf->tail[0].iov_base + buf->tail[0].iov_len;
+ else
+ obj->data = buf->head[0].iov_base + buf->head[0].iov_len;
+ __read_bytes_from_xdr_buf(&subbuf, obj->data, obj->len);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(xdr_buf_read_netobj);
+
+/* Returns 0 on success, or else a negative error code. */
+static int
+xdr_xcode_array2(struct xdr_buf *buf, unsigned int base,
+ struct xdr_array2_desc *desc, int encode)
+{
+ char *elem = NULL, *c;
+ unsigned int copied = 0, todo, avail_here;
+ struct page **ppages = NULL;
+ int err;
+
+ if (encode) {
+ if (xdr_encode_word(buf, base, desc->array_len) != 0)
+ return -EINVAL;
+ } else {
+ if (xdr_decode_word(buf, base, &desc->array_len) != 0 ||
+ desc->array_len > desc->array_maxlen ||
+ (unsigned long) base + 4 + desc->array_len *
+ desc->elem_size > buf->len)
+ return -EINVAL;
+ }
+ base += 4;
+
+ if (!desc->xcode)
+ return 0;
+
+ todo = desc->array_len * desc->elem_size;
+
+ /* process head */
+ if (todo && base < buf->head->iov_len) {
+ c = buf->head->iov_base + base;
+ avail_here = min_t(unsigned int, todo,
+ buf->head->iov_len - base);
+ todo -= avail_here;
+
+ while (avail_here >= desc->elem_size) {
+ err = desc->xcode(desc, c);
+ if (err)
+ goto out;
+ c += desc->elem_size;
+ avail_here -= desc->elem_size;
+ }
+ if (avail_here) {
+ if (!elem) {
+ elem = kmalloc(desc->elem_size, GFP_KERNEL);
+ err = -ENOMEM;
+ if (!elem)
+ goto out;
+ }
+ if (encode) {
+ err = desc->xcode(desc, elem);
+ if (err)
+ goto out;
+ memcpy(c, elem, avail_here);
+ } else
+ memcpy(elem, c, avail_here);
+ copied = avail_here;
+ }
+ base = buf->head->iov_len; /* align to start of pages */
+ }
+
+ /* process pages array */
+ base -= buf->head->iov_len;
+ if (todo && base < buf->page_len) {
+ unsigned int avail_page;
+
+ avail_here = min(todo, buf->page_len - base);
+ todo -= avail_here;
+
+ base += buf->page_base;
+ ppages = buf->pages + (base >> PAGE_CACHE_SHIFT);
+ base &= ~PAGE_CACHE_MASK;
+ avail_page = min_t(unsigned int, PAGE_CACHE_SIZE - base,
+ avail_here);
+ c = kmap(*ppages) + base;
+
+ while (avail_here) {
+ avail_here -= avail_page;
+ if (copied || avail_page < desc->elem_size) {
+ unsigned int l = min(avail_page,
+ desc->elem_size - copied);
+ if (!elem) {
+ elem = kmalloc(desc->elem_size,
+ GFP_KERNEL);
+ err = -ENOMEM;
+ if (!elem)
+ goto out;
+ }
+ if (encode) {
+ if (!copied) {
+ err = desc->xcode(desc, elem);
+ if (err)
+ goto out;
+ }
+ memcpy(c, elem + copied, l);
+ copied += l;
+ if (copied == desc->elem_size)
+ copied = 0;
+ } else {
+ memcpy(elem + copied, c, l);
+ copied += l;
+ if (copied == desc->elem_size) {
+ err = desc->xcode(desc, elem);
+ if (err)
+ goto out;
+ copied = 0;
+ }
+ }
+ avail_page -= l;
+ c += l;
+ }
+ while (avail_page >= desc->elem_size) {
+ err = desc->xcode(desc, c);
+ if (err)
+ goto out;
+ c += desc->elem_size;
+ avail_page -= desc->elem_size;
+ }
+ if (avail_page) {
+ unsigned int l = min(avail_page,
+ desc->elem_size - copied);
+ if (!elem) {
+ elem = kmalloc(desc->elem_size,
+ GFP_KERNEL);
+ err = -ENOMEM;
+ if (!elem)
+ goto out;
+ }
+ if (encode) {
+ if (!copied) {
+ err = desc->xcode(desc, elem);
+ if (err)
+ goto out;
+ }
+ memcpy(c, elem + copied, l);
+ copied += l;
+ if (copied == desc->elem_size)
+ copied = 0;
+ } else {
+ memcpy(elem + copied, c, l);
+ copied += l;
+ if (copied == desc->elem_size) {
+ err = desc->xcode(desc, elem);
+ if (err)
+ goto out;
+ copied = 0;
+ }
+ }
+ }
+ if (avail_here) {
+ kunmap(*ppages);
+ ppages++;
+ c = kmap(*ppages);
+ }
+
+ avail_page = min(avail_here,
+ (unsigned int) PAGE_CACHE_SIZE);
+ }
+ base = buf->page_len; /* align to start of tail */
+ }
+
+ /* process tail */
+ base -= buf->page_len;
+ if (todo) {
+ c = buf->tail->iov_base + base;
+ if (copied) {
+ unsigned int l = desc->elem_size - copied;
+
+ if (encode)
+ memcpy(c, elem + copied, l);
+ else {
+ memcpy(elem + copied, c, l);
+ err = desc->xcode(desc, elem);
+ if (err)
+ goto out;
+ }
+ todo -= l;
+ c += l;
+ }
+ while (todo) {
+ err = desc->xcode(desc, c);
+ if (err)
+ goto out;
+ c += desc->elem_size;
+ todo -= desc->elem_size;
+ }
+ }
+ err = 0;
+
+out:
+ kfree(elem);
+ if (ppages)
+ kunmap(*ppages);
+ return err;
+}
+
+int
+xdr_decode_array2(struct xdr_buf *buf, unsigned int base,
+ struct xdr_array2_desc *desc)
+{
+ if (base >= buf->len)
+ return -EINVAL;
+
+ return xdr_xcode_array2(buf, base, desc, 0);
+}
+EXPORT_SYMBOL_GPL(xdr_decode_array2);
+
+int
+xdr_encode_array2(struct xdr_buf *buf, unsigned int base,
+ struct xdr_array2_desc *desc)
+{
+ if ((unsigned long) base + 4 + desc->array_len * desc->elem_size >
+ buf->head->iov_len + buf->page_len + buf->tail->iov_len)
+ return -EINVAL;
+
+ return xdr_xcode_array2(buf, base, desc, 1);
+}
+EXPORT_SYMBOL_GPL(xdr_encode_array2);
+
+int
+xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len,
+ int (*actor)(struct scatterlist *, void *), void *data)
+{
+ int i, ret = 0;
+ unsigned int page_len, thislen, page_offset;
+ struct scatterlist sg[1];
+
+ sg_init_table(sg, 1);
+
+ if (offset >= buf->head[0].iov_len) {
+ offset -= buf->head[0].iov_len;
+ } else {
+ thislen = buf->head[0].iov_len - offset;
+ if (thislen > len)
+ thislen = len;
+ sg_set_buf(sg, buf->head[0].iov_base + offset, thislen);
+ ret = actor(sg, data);
+ if (ret)
+ goto out;
+ offset = 0;
+ len -= thislen;
+ }
+ if (len == 0)
+ goto out;
+
+ if (offset >= buf->page_len) {
+ offset -= buf->page_len;
+ } else {
+ page_len = buf->page_len - offset;
+ if (page_len > len)
+ page_len = len;
+ len -= page_len;
+ page_offset = (offset + buf->page_base) & (PAGE_CACHE_SIZE - 1);
+ i = (offset + buf->page_base) >> PAGE_CACHE_SHIFT;
+ thislen = PAGE_CACHE_SIZE - page_offset;
+ do {
+ if (thislen > page_len)
+ thislen = page_len;
+ sg_set_page(sg, buf->pages[i], thislen, page_offset);
+ ret = actor(sg, data);
+ if (ret)
+ goto out;
+ page_len -= thislen;
+ i++;
+ page_offset = 0;
+ thislen = PAGE_CACHE_SIZE;
+ } while (page_len != 0);
+ offset = 0;
+ }
+ if (len == 0)
+ goto out;
+ if (offset < buf->tail[0].iov_len) {
+ thislen = buf->tail[0].iov_len - offset;
+ if (thislen > len)
+ thislen = len;
+ sg_set_buf(sg, buf->tail[0].iov_base + offset, thislen);
+ ret = actor(sg, data);
+ len -= thislen;
+ }
+ if (len != 0)
+ ret = -EINVAL;
+out:
+ return ret;
+}
+EXPORT_SYMBOL_GPL(xdr_process_buf);
+
Code Review / kvmfornfv.git / blobdiff