* @len: length of string, in bytes
*
*/
-void
-xdr_terminate_string(struct xdr_buf *buf, const u32 len)
+void xdr_terminate_string(const struct xdr_buf *buf, const u32 len)
{
char *kaddr;
}
EXPORT_SYMBOL_GPL(xdr_terminate_string);
-size_t
-xdr_buf_pagecount(struct xdr_buf *buf)
+size_t xdr_buf_pagecount(const struct xdr_buf *buf)
{
if (!buf->page_len)
return 0;
} while ((len -= zero) != 0);
}
+static unsigned int xdr_buf_pages_fill_sparse(const struct xdr_buf *buf,
+ unsigned int buflen, gfp_t gfp)
+{
+ unsigned int i, npages, pagelen;
+
+ if (!(buf->flags & XDRBUF_SPARSE_PAGES))
+ return buflen;
+ if (buflen <= buf->head->iov_len)
+ return buflen;
+ pagelen = buflen - buf->head->iov_len;
+ if (pagelen > buf->page_len)
+ pagelen = buf->page_len;
+ npages = (pagelen + buf->page_base + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ for (i = 0; i < npages; i++) {
+ if (!buf->pages[i])
+ continue;
+ buf->pages[i] = alloc_page(gfp);
+ if (likely(buf->pages[i]))
+ continue;
+ buflen -= pagelen;
+ pagelen = i << PAGE_SHIFT;
+ if (pagelen > buf->page_base)
+ buflen += pagelen - buf->page_base;
+ break;
+ }
+ return buflen;
+}
+
static void xdr_buf_try_expand(struct xdr_buf *buf, unsigned int len)
{
struct kvec *head = buf->head;
struct kvec *tail = buf->tail;
unsigned int sum = head->iov_len + buf->page_len + tail->iov_len;
- unsigned int free_space;
+ unsigned int free_space, newlen;
if (sum > buf->len) {
free_space = min_t(unsigned int, sum - buf->len, len);
- buf->len += free_space;
+ newlen = xdr_buf_pages_fill_sparse(buf, buf->len + free_space,
+ GFP_KERNEL);
+ free_space = newlen - buf->len;
+ buf->len = newlen;
len -= free_space;
if (!len)
return;
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);
+ xdr_reset_scratch_buffer(xdr);
BUG_ON(scratch_len < 0);
xdr->buf = buf;
xdr->iov = iov;
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;
+ xdr_reset_scratch_buffer(xdr);
}
EXPORT_SYMBOL_GPL(xdr_commit_encode);
* 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;
+ xdr_set_scratch_buffer(xdr, xdr->p, frag1bytes);
p = page_address(*xdr->page_ptr);
/*
* Note this is where the next encode will start after we've
return len - base;
}
+static unsigned int xdr_set_tail_base(struct xdr_stream *xdr,
+ unsigned int base, unsigned int len)
+{
+ struct xdr_buf *buf = xdr->buf;
+
+ xdr_stream_set_pos(xdr, base + buf->page_len + buf->head->iov_len);
+ return xdr_set_iov(xdr, buf->tail, base, len);
+}
+
static unsigned int xdr_set_page_base(struct xdr_stream *xdr,
unsigned int base, unsigned int len)
{
if (len > maxlen)
len = maxlen;
+ xdr_stream_page_set_pos(xdr, base);
base += xdr->buf->page_base;
pgnr = base >> PAGE_SHIFT;
{
if (xdr_set_page_base(xdr, base, len) == 0) {
base -= xdr->buf->page_len;
- xdr_set_iov(xdr, xdr->buf->tail, base, len);
+ xdr_set_tail_base(xdr, base, len);
}
}
if (newbase < xdr->buf->page_len)
xdr_set_page_base(xdr, newbase, xdr_stream_remaining(xdr));
else
- xdr_set_iov(xdr, xdr->buf->tail, 0, xdr_stream_remaining(xdr));
+ xdr_set_tail_base(xdr, 0, xdr_stream_remaining(xdr));
}
static bool xdr_set_next_buffer(struct xdr_stream *xdr)
struct rpc_rqst *rqst)
{
xdr->buf = buf;
- xdr->scratch.iov_base = NULL;
- xdr->scratch.iov_len = 0;
+ xdr_reset_scratch_buffer(xdr);
xdr->nwords = XDR_QUADLEN(buf->len);
if (xdr_set_iov(xdr, buf->head, 0, buf->len) == 0 &&
xdr_set_page_base(xdr, 0, buf->len) == 0)
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;
if (iov->iov_len > cur) {
copied = xdr_shrink_bufhead(buf, cur);
trace_rpc_xdr_alignment(xdr, cur, copied);
- xdr->nwords = XDR_QUADLEN(buf->len - cur);
+ xdr_set_page(xdr, 0, buf->page_len);
}
}
{
struct xdr_buf *buf = xdr->buf;
unsigned int nwords = XDR_QUADLEN(len);
- unsigned int cur = xdr_stream_pos(xdr);
unsigned int copied;
if (xdr->nwords == 0)
/* Truncate page data and move it into the tail */
copied = xdr_shrink_pagelen(buf, len);
trace_rpc_xdr_alignment(xdr, len, copied);
- xdr->nwords = XDR_QUADLEN(buf->len - cur);
}
return len;
}
if (pglen == 0)
return 0;
- xdr->nwords -= nwords;
base = (nwords << 2) - pglen;
end = xdr_stream_remaining(xdr) - pglen;
- if (xdr_set_iov(xdr, xdr->buf->tail, base, end) == 0)
- xdr->nwords = 0;
+ xdr_set_tail_base(xdr, base, end);
return len <= pglen ? len : pglen;
}
EXPORT_SYMBOL_GPL(xdr_read_pages);
/* Move page data to the left */
shift = from - offset;
xdr_buf_pages_shift_left(buf, from, len, shift);
- xdr->buf->len -= shift;
- xdr->nwords -= XDR_QUADLEN(shift);
bytes = xdr_stream_remaining(xdr);
if (length > bytes)
length = bytes;
bytes -= length;
- xdr->nwords -= XDR_QUADLEN(length);
+ xdr->buf->len -= shift;
xdr_set_page(xdr, offset + length, bytes);
return length;
}
shift = to - from;
xdr_buf_try_expand(buf, shift);
xdr_buf_pages_shift_right(buf, from, buflen, shift);
- xdr_stream_page_set_pos(xdr, to);
+ xdr_set_page(xdr, to, xdr_stream_remaining(xdr));
} else if (to != from)
xdr_align_data(xdr, to, 0);
xdr_buf_pages_zero(buf, offset, length);
- xdr_set_page(xdr, to, xdr_stream_remaining(xdr));
return length;
}
EXPORT_SYMBOL_GPL(xdr_expand_hole);
static const struct kvec empty_iov = {.iov_base = NULL, .iov_len = 0};
-void
-xdr_buf_from_iov(struct kvec *iov, struct xdr_buf *buf)
+void xdr_buf_from_iov(const struct kvec *iov, struct xdr_buf *buf)
{
buf->head[0] = *iov;
buf->tail[0] = empty_iov;
*
* 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)
+int xdr_buf_subsegment(const 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) {
}
EXPORT_SYMBOL_GPL(xdr_buf_subsegment);
+/**
+ * xdr_stream_subsegment - set @subbuf to a portion of @xdr
+ * @xdr: an xdr_stream set up for decoding
+ * @subbuf: the result buffer
+ * @nbytes: length of @xdr to extract, in bytes
+ *
+ * Sets up @subbuf to represent a portion of @xdr. The portion
+ * starts at the current offset in @xdr, and extends for a length
+ * of @nbytes. If this is successful, @xdr is advanced to the next
+ * position following that portion.
+ *
+ * Return values:
+ * %true: @subbuf has been initialized, and @xdr has been advanced.
+ * %false: a bounds error has occurred
+ */
+bool xdr_stream_subsegment(struct xdr_stream *xdr, struct xdr_buf *subbuf,
+ unsigned int nbytes)
+{
+ unsigned int remaining, offset, len;
+
+ if (xdr_buf_subsegment(xdr->buf, subbuf, xdr_stream_pos(xdr), nbytes))
+ return false;
+
+ if (subbuf->head[0].iov_len)
+ if (!__xdr_inline_decode(xdr, subbuf->head[0].iov_len))
+ return false;
+
+ remaining = subbuf->page_len;
+ offset = subbuf->page_base;
+ while (remaining) {
+ len = min_t(unsigned int, remaining, PAGE_SIZE) - offset;
+
+ if (xdr->p == xdr->end && !xdr_set_next_buffer(xdr))
+ return false;
+ if (!__xdr_inline_decode(xdr, len))
+ return false;
+
+ remaining -= len;
+ offset = 0;
+ }
+
+ return true;
+}
+EXPORT_SYMBOL_GPL(xdr_stream_subsegment);
+
/**
* xdr_buf_trim - lop at most "len" bytes off the end of "buf"
* @buf: buf to be trimmed
}
EXPORT_SYMBOL_GPL(xdr_buf_trim);
-static void __read_bytes_from_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len)
+static void __read_bytes_from_xdr_buf(const struct xdr_buf *subbuf,
+ void *obj, unsigned int len)
{
unsigned int 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)
+int read_bytes_from_xdr_buf(const struct xdr_buf *buf, unsigned int base,
+ void *obj, unsigned int len)
{
struct xdr_buf subbuf;
int status;
}
EXPORT_SYMBOL_GPL(read_bytes_from_xdr_buf);
-static void __write_bytes_to_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len)
+static void __write_bytes_to_xdr_buf(const struct xdr_buf *subbuf,
+ void *obj, unsigned int len)
{
unsigned int 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)
+int write_bytes_to_xdr_buf(const struct xdr_buf *buf, unsigned int base,
+ void *obj, unsigned int len)
{
struct xdr_buf subbuf;
int status;
}
EXPORT_SYMBOL_GPL(write_bytes_to_xdr_buf);
-int
-xdr_decode_word(struct xdr_buf *buf, unsigned int base, u32 *obj)
+int xdr_decode_word(const struct xdr_buf *buf, unsigned int base, u32 *obj)
{
__be32 raw;
int status;
}
EXPORT_SYMBOL_GPL(xdr_decode_word);
-int
-xdr_encode_word(struct xdr_buf *buf, unsigned int base, u32 obj)
+int xdr_encode_word(const struct xdr_buf *buf, unsigned int base, u32 obj)
{
__be32 raw = cpu_to_be32(obj);
EXPORT_SYMBOL_GPL(xdr_encode_word);
/* 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)
+static int xdr_xcode_array2(const 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;
return err;
}
-int
-xdr_decode_array2(struct xdr_buf *buf, unsigned int base,
- struct xdr_array2_desc *desc)
+int xdr_decode_array2(const struct xdr_buf *buf, unsigned int base,
+ struct xdr_array2_desc *desc)
{
if (base >= buf->len)
return -EINVAL;
}
EXPORT_SYMBOL_GPL(xdr_decode_array2);
-int
-xdr_encode_array2(struct xdr_buf *buf, unsigned int base,
- struct xdr_array2_desc *desc)
+int xdr_encode_array2(const 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)
}
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 xdr_process_buf(const 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;
projects / linux-2.6-microblaze.git / blobdiff