xdr.c revision 2e29ebb8119e6037133921fac09cc5f9d625b511
11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * linux/net/sunrpc/xdr.c 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Generic XDR support. 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9a246b0105bbd9a70a698f69baae2042996f2a0e9Chuck Lever#include <linux/module.h> 105a0e3ad6af8660be21ca98a971cd00f331318c05Tejun Heo#include <linux/slab.h> 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/types.h> 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/string.h> 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/kernel.h> 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/pagemap.h> 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/errno.h> 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/sunrpc/xdr.h> 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/sunrpc/msg_prot.h> 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * XDR functions for basic NFS types 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 22d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan__be32 * 23d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyanxdr_encode_netobj(__be32 *p, const struct xdr_netobj *obj) 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int quadlen = XDR_QUADLEN(obj->len); 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds p[quadlen] = 0; /* zero trailing bytes */ 289f162d2a810b4db48f7b8d7e734d0932c81ec2a1Benny Halevy *p++ = cpu_to_be32(obj->len); 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memcpy(p, obj->data, obj->len); 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return p + XDR_QUADLEN(obj->len); 311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 32468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_encode_netobj); 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 34d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan__be32 * 35d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyanxdr_decode_netobj(__be32 *p, struct xdr_netobj *obj) 361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int len; 381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3998866b5abe1513cdacc011874ca045d40002eccdBenny Halevy if ((len = be32_to_cpu(*p++)) > XDR_MAX_NETOBJ) 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds obj->len = len; 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds obj->data = (u8 *) p; 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return p + XDR_QUADLEN(len); 441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 45468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_decode_netobj); 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_encode_opaque_fixed - Encode fixed length opaque data 494dc3b16ba18c0f967ad100c52fa65b01a4f76ff0Pavel Pisa * @p: pointer to current position in XDR buffer. 504dc3b16ba18c0f967ad100c52fa65b01a4f76ff0Pavel Pisa * @ptr: pointer to data to encode (or NULL) 514dc3b16ba18c0f967ad100c52fa65b01a4f76ff0Pavel Pisa * @nbytes: size of data. 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copy the array of data of length nbytes at ptr to the XDR buffer 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * at position p, then align to the next 32-bit boundary by padding 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * with zero bytes (see RFC1832). 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Note: if ptr is NULL, only the padding is performed. 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Returns the updated current XDR buffer position 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 61d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan__be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int nbytes) 621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (likely(nbytes != 0)) { 641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int quadlen = XDR_QUADLEN(nbytes); 651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int padding = (quadlen << 2) - nbytes; 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ptr != NULL) 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memcpy(p, ptr, nbytes); 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (padding != 0) 701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memset((char *)p + nbytes, 0, padding); 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds p += quadlen; 721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return p; 741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 75468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_encode_opaque_fixed); 761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_encode_opaque - Encode variable length opaque data 794dc3b16ba18c0f967ad100c52fa65b01a4f76ff0Pavel Pisa * @p: pointer to current position in XDR buffer. 804dc3b16ba18c0f967ad100c52fa65b01a4f76ff0Pavel Pisa * @ptr: pointer to data to encode (or NULL) 814dc3b16ba18c0f967ad100c52fa65b01a4f76ff0Pavel Pisa * @nbytes: size of data. 821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Returns the updated current XDR buffer position 841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 85d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan__be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int nbytes) 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 879f162d2a810b4db48f7b8d7e734d0932c81ec2a1Benny Halevy *p++ = cpu_to_be32(nbytes); 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return xdr_encode_opaque_fixed(p, ptr, nbytes); 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 90468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_encode_opaque); 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 92d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan__be32 * 93d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyanxdr_encode_string(__be32 *p, const char *string) 941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return xdr_encode_array(p, string, strlen(string)); 961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 97468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_encode_string); 981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 99d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan__be32 * 100e5cff482c78a35b9f149a06aa777a1bd693864fbChuck Leverxdr_decode_string_inplace(__be32 *p, char **sp, 101e5cff482c78a35b9f149a06aa777a1bd693864fbChuck Lever unsigned int *lenp, unsigned int maxlen) 1021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 103e5cff482c78a35b9f149a06aa777a1bd693864fbChuck Lever u32 len; 1041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10598866b5abe1513cdacc011874ca045d40002eccdBenny Halevy len = be32_to_cpu(*p++); 106e5cff482c78a35b9f149a06aa777a1bd693864fbChuck Lever if (len > maxlen) 1071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 1081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *lenp = len; 1091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *sp = (char *) p; 1101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return p + XDR_QUADLEN(len); 1111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 112468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_decode_string_inplace); 1131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid 1151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsxdr_encode_pages(struct xdr_buf *xdr, struct page **pages, unsigned int base, 1161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int len) 1171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *tail = xdr->tail; 1191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds u32 *p; 1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->pages = pages; 1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->page_base = base; 1231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->page_len = len; 1241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds p = (u32 *)xdr->head[0].iov_base + XDR_QUADLEN(xdr->head[0].iov_len); 1261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tail->iov_base = p; 1271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tail->iov_len = 0; 1281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (len & 3) { 1301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int pad = 4 - (len & 3); 1311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *p = 0; 1331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tail->iov_base = (char *)p + (len & 3); 1341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tail->iov_len = pad; 1351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len += pad; 1361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->buflen += len; 1381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->len += len; 1391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 140468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_encode_pages); 1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid 1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsxdr_inline_pages(struct xdr_buf *xdr, unsigned int offset, 1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct page **pages, unsigned int base, unsigned int len) 1451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *head = xdr->head; 1471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *tail = xdr->tail; 1481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *buf = (char *)head->iov_base; 1491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int buflen = head->iov_len; 1501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds head->iov_len = offset; 1521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->pages = pages; 1541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->page_base = base; 1551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->page_len = len; 1561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tail->iov_base = buf + offset; 1581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tail->iov_len = buflen - offset; 1591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->buflen += len; 1611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 162468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_inline_pages); 1631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Helper routines for doing 'memmove' like operations on a struct xdr_buf 1661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * _shift_data_right_pages 1681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pages: vector of pages containing both the source and dest memory area. 1691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pgto_base: page vector address of destination 1701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pgfrom_base: page vector address of source 1711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: number of bytes to copy 1721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Note: the addresses pgto_base and pgfrom_base are both calculated in 1741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * the same way: 1751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * if a memory area starts at byte 'base' in page 'pages[i]', 1761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * then its address is given as (i << PAGE_CACHE_SHIFT) + base 1771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Also note: pgfrom_base must be < pgto_base, but the memory areas 1781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * they point to may overlap. 1791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void 1811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds_shift_data_right_pages(struct page **pages, size_t pgto_base, 1821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t pgfrom_base, size_t len) 1831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct page **pgfrom, **pgto; 1851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *vfrom, *vto; 1861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t copy; 1871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BUG_ON(pgto_base <= pgfrom_base); 1891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgto_base += len; 1911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgfrom_base += len; 1921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgto = pages + (pgto_base >> PAGE_CACHE_SHIFT); 1941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgfrom = pages + (pgfrom_base >> PAGE_CACHE_SHIFT); 1951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgto_base &= ~PAGE_CACHE_MASK; 1971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgfrom_base &= ~PAGE_CACHE_MASK; 1981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds do { 2001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Are any pointers crossing a page boundary? */ 2011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (pgto_base == 0) { 2021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgto_base = PAGE_CACHE_SIZE; 2031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgto--; 2041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (pgfrom_base == 0) { 2061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgfrom_base = PAGE_CACHE_SIZE; 2071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgfrom--; 2081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = len; 2111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy > pgto_base) 2121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = pgto_base; 2131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy > pgfrom_base) 2141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = pgfrom_base; 2151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgto_base -= copy; 2161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgfrom_base -= copy; 2171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds vto = kmap_atomic(*pgto, KM_USER0); 2191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds vfrom = kmap_atomic(*pgfrom, KM_USER1); 2201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memmove(vto + pgto_base, vfrom + pgfrom_base, copy); 221bce3481c91801665e17f8daf59ede946129f3d3fTrond Myklebust flush_dcache_page(*pgto); 2221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kunmap_atomic(vfrom, KM_USER1); 2231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kunmap_atomic(vto, KM_USER0); 2241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } while ((len -= copy) != 0); 2261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 2291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * _copy_to_pages 2301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pages: array of pages 2311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pgbase: page vector address of destination 2321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @p: pointer to source data 2331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: length 2341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copies data from an arbitrary memory location into an array of pages 2361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The copy is assumed to be non-overlapping. 2371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void 2391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds_copy_to_pages(struct page **pages, size_t pgbase, const char *p, size_t len) 2401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct page **pgto; 2421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *vto; 2431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t copy; 2441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgto = pages + (pgbase >> PAGE_CACHE_SHIFT); 2461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgbase &= ~PAGE_CACHE_MASK; 2471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 248daeba89d43af0fa469d38a4ccdc32fff8ca17c2eTrond Myklebust for (;;) { 2491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = PAGE_CACHE_SIZE - pgbase; 2501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy > len) 2511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = len; 2521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds vto = kmap_atomic(*pgto, KM_USER0); 2541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memcpy(vto + pgbase, p, copy); 2551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kunmap_atomic(vto, KM_USER0); 2561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 257daeba89d43af0fa469d38a4ccdc32fff8ca17c2eTrond Myklebust len -= copy; 258daeba89d43af0fa469d38a4ccdc32fff8ca17c2eTrond Myklebust if (len == 0) 259daeba89d43af0fa469d38a4ccdc32fff8ca17c2eTrond Myklebust break; 260daeba89d43af0fa469d38a4ccdc32fff8ca17c2eTrond Myklebust 2611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgbase += copy; 2621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (pgbase == PAGE_CACHE_SIZE) { 2631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds flush_dcache_page(*pgto); 2641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgbase = 0; 2651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgto++; 2661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds p += copy; 268daeba89d43af0fa469d38a4ccdc32fff8ca17c2eTrond Myklebust } 2691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds flush_dcache_page(*pgto); 2701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 2731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * _copy_from_pages 2741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @p: pointer to destination 2751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pages: array of pages 2761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pgbase: offset of source data 2771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: length 2781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copies data into an arbitrary memory location from an array of pages 2801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The copy is assumed to be non-overlapping. 2811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void 2831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds_copy_from_pages(char *p, struct page **pages, size_t pgbase, size_t len) 2841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct page **pgfrom; 2861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *vfrom; 2871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t copy; 2881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgfrom = pages + (pgbase >> PAGE_CACHE_SHIFT); 2901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgbase &= ~PAGE_CACHE_MASK; 2911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds do { 2931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = PAGE_CACHE_SIZE - pgbase; 2941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy > len) 2951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = len; 2961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds vfrom = kmap_atomic(*pgfrom, KM_USER0); 2981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memcpy(p, vfrom + pgbase, copy); 2991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kunmap_atomic(vfrom, KM_USER0); 3001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgbase += copy; 3021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (pgbase == PAGE_CACHE_SIZE) { 3031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgbase = 0; 3041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgfrom++; 3051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds p += copy; 3071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } while ((len -= copy) != 0); 3091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 3121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_shrink_bufhead 3131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @buf: xdr_buf 3141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: bytes to remove from buf->head[0] 3151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 316cca5172a7ec10dfdb0b787cd8e9d5b0b8f179793YOSHIFUJI Hideaki * Shrinks XDR buffer's header kvec buf->head[0] by 3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 'len' bytes. The extra data is not lost, but is instead 3181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * moved into the inlined pages and/or the tail. 3191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void 3211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsxdr_shrink_bufhead(struct xdr_buf *buf, size_t len) 3221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *head, *tail; 3241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t copy, offs; 3251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int pglen = buf->page_len; 3261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tail = buf->tail; 3281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds head = buf->head; 3291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BUG_ON (len > head->iov_len); 3301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Shift the tail first */ 3321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (tail->iov_len != 0) { 3331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (tail->iov_len > len) { 3341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = tail->iov_len - len; 3351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memmove((char *)tail->iov_base + len, 3361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tail->iov_base, copy); 3371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Copy from the inlined pages into the tail */ 3391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = len; 3401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy > pglen) 3411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = pglen; 3421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds offs = len - copy; 3431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (offs >= tail->iov_len) 3441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = 0; 3451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else if (copy > tail->iov_len - offs) 3461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = tail->iov_len - offs; 3471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy != 0) 3481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds _copy_from_pages((char *)tail->iov_base + offs, 3491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->pages, 3501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_base + pglen + offs - len, 3511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy); 3521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Do we also need to copy data from the head into the tail ? */ 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (len > pglen) { 3541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds offs = copy = len - pglen; 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy > tail->iov_len) 3561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = tail->iov_len; 3571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memcpy(tail->iov_base, 3581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (char *)head->iov_base + 3591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds head->iov_len - offs, 3601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy); 3611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Now handle pages */ 3641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (pglen != 0) { 3651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (pglen > len) 3661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds _shift_data_right_pages(buf->pages, 3671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_base + len, 3681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_base, 3691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pglen - len); 3701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = len; 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (len > pglen) 3721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = pglen; 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds _copy_to_pages(buf->pages, buf->page_base, 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (char *)head->iov_base + head->iov_len - len, 3751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy); 3761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds head->iov_len -= len; 3781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->buflen -= len; 3791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Have we truncated the message? */ 3801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (buf->len > buf->buflen) 3811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->len = buf->buflen; 3821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 3851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_shrink_pagelen 3861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @buf: xdr_buf 3871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: bytes to remove from buf->pages 3881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 389cca5172a7ec10dfdb0b787cd8e9d5b0b8f179793YOSHIFUJI Hideaki * Shrinks XDR buffer's page array buf->pages by 3901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 'len' bytes. The extra data is not lost, but is instead 3911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * moved into the tail. 3921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void 3941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsxdr_shrink_pagelen(struct xdr_buf *buf, size_t len) 3951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *tail; 3971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t copy; 3981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int pglen = buf->page_len; 3991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tail = buf->tail; 4011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BUG_ON (len > pglen); 4021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Shift the tail first */ 4041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (tail->iov_len != 0) { 4051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (tail->iov_len > len) { 4060fe62a35903e11fb41b492bd5b0e8e4c751d5c94Benny Halevy char *p = (char *)tail->iov_base + len; 4072e29ebb8119e6037133921fac09cc5f9d625b511Benny Halevy memmove(p, tail->iov_base, tail->iov_len - len); 408b1a7a91ada8388936ffff92cf1ad57b3e926f412Benny Halevy } 4091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Copy from the inlined pages into the tail */ 4101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = len; 4111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy > tail->iov_len) 4121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = tail->iov_len; 4131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds _copy_from_pages((char *)tail->iov_base, 4141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->pages, buf->page_base + pglen - len, 4151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy); 4161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_len -= len; 4181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->buflen -= len; 4191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Have we truncated the message? */ 4201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (buf->len > buf->buflen) 4211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->len = buf->buflen; 4221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid 4251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsxdr_shift_buf(struct xdr_buf *buf, size_t len) 4261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr_shrink_bufhead(buf, len); 4281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 429468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_shift_buf); 4301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 4321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_init_encode - Initialize a struct xdr_stream for sending data. 4331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @xdr: pointer to xdr_stream struct 4341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @buf: pointer to XDR buffer in which to encode data 4351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @p: current pointer inside XDR buffer 4361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 4371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Note: at the moment the RPC client only passes the length of our 4381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * scratch buffer in the xdr_buf's header kvec. Previously this 4391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * meant we needed to call xdr_adjust_iovec() after encoding the 4401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * data. With the new scheme, the xdr_stream manages the details 4411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * of the buffer length, and takes care of adjusting the kvec 4421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * length for us. 4431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 444d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyanvoid xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p) 4451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *iov = buf->head; 447334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust int scratch_len = buf->buflen - buf->page_len - buf->tail[0].iov_len; 4481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 449334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust BUG_ON(scratch_len < 0); 4501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->buf = buf; 4511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->iov = iov; 452d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan xdr->p = (__be32 *)((char *)iov->iov_base + iov->iov_len); 453d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan xdr->end = (__be32 *)((char *)iov->iov_base + scratch_len); 454334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust BUG_ON(iov->iov_len > scratch_len); 455334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust 456334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust if (p != xdr->p && p != NULL) { 457334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust size_t len; 458334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust 459334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust BUG_ON(p < xdr->p || p > xdr->end); 460334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust len = (char *)p - (char *)xdr->p; 461334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust xdr->p = p; 462334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust buf->len += len; 463334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust iov->iov_len += len; 464334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust } 4651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 466468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_init_encode); 4671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 4691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_reserve_space - Reserve buffer space for sending 4701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @xdr: pointer to xdr_stream 4711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @nbytes: number of bytes to reserve 4721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 4731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Checks that we have enough buffer space to encode 'nbytes' more 4741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * bytes of data. If so, update the total xdr_buf length, and 4751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * adjust the length of the current kvec. 4761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 477d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan__be32 * xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes) 4781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 479d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan __be32 *p = xdr->p; 480d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan __be32 *q; 4811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* align nbytes on the next 32-bit boundary */ 4831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds nbytes += 3; 4841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds nbytes &= ~3; 4851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds q = p + (nbytes >> 2); 4861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (unlikely(q > xdr->end || q < p)) 4871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 4881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->p = q; 4891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->iov->iov_len += nbytes; 4901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->buf->len += nbytes; 4911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return p; 4921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 493468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_reserve_space); 4941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 4961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_write_pages - Insert a list of pages into an XDR buffer for sending 4971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @xdr: pointer to xdr_stream 4981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pages: list of pages 4991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @base: offset of first byte 5001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: length of data in bytes 5011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 5021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 5031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid xdr_write_pages(struct xdr_stream *xdr, struct page **pages, unsigned int base, 5041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int len) 5051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct xdr_buf *buf = xdr->buf; 5071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *iov = buf->tail; 5081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->pages = pages; 5091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_base = base; 5101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_len = len; 5111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iov->iov_base = (char *)xdr->p; 5131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iov->iov_len = 0; 5141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->iov = iov; 5151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (len & 3) { 5171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int pad = 4 - (len & 3); 5181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BUG_ON(xdr->p >= xdr->end); 5201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iov->iov_base = (char *)xdr->p + (len & 3); 5211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iov->iov_len += pad; 5221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len += pad; 5231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *xdr->p++ = 0; 5241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->buflen += len; 5261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->len += len; 5271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 528468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_write_pages); 5291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 5311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_init_decode - Initialize an xdr_stream for decoding data. 5321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @xdr: pointer to xdr_stream struct 5331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @buf: pointer to XDR buffer from which to decode data 5341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @p: current pointer inside XDR buffer 5351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 536d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyanvoid xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p) 5371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *iov = buf->head; 5391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int len = iov->iov_len; 5401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (len > buf->len) 5421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len = buf->len; 5431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->buf = buf; 5441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->iov = iov; 5451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->p = p; 546d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan xdr->end = (__be32 *)((char *)iov->iov_base + len); 5471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 548468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_init_decode); 5491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 5511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_inline_decode - Retrieve non-page XDR data to decode 5521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @xdr: pointer to xdr_stream struct 5531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @nbytes: number of bytes of data to decode 5541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 5551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Check if the input buffer is long enough to enable us to decode 5561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 'nbytes' more bytes of data starting at the current position. 5571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * If so return the current pointer, then update the current 5581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * pointer position. 5591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 560d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan__be32 * xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes) 5611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 562d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan __be32 *p = xdr->p; 563d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan __be32 *q = p + XDR_QUADLEN(nbytes); 5641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (unlikely(q > xdr->end || q < p)) 5661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 5671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->p = q; 5681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return p; 5691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 570468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_inline_decode); 5711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 5731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_read_pages - Ensure page-based XDR data to decode is aligned at current pointer position 5741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @xdr: pointer to xdr_stream struct 5751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: number of bytes of page data 5761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 5771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Moves data beyond the current pointer position from the XDR head[] buffer 5781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * into the page list. Any data that lies beyond current position + "len" 5798b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * bytes is moved into the XDR tail[]. 5801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 5811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid xdr_read_pages(struct xdr_stream *xdr, unsigned int len) 5821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct xdr_buf *buf = xdr->buf; 5841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *iov; 5851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ssize_t shift; 5861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int end; 5871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int padding; 5881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Realign pages to current pointer position */ 5901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iov = buf->head; 5911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shift = iov->iov_len + (char *)iov->iov_base - (char *)xdr->p; 5921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (shift > 0) 5931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr_shrink_bufhead(buf, shift); 5941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Truncate page data and move it into the tail */ 5961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (buf->page_len > len) 5971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr_shrink_pagelen(buf, buf->page_len - len); 5981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds padding = (XDR_QUADLEN(len) << 2) - len; 5991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->iov = iov = buf->tail; 6001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Compute remaining message length. */ 6011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds end = iov->iov_len; 6021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shift = buf->buflen - buf->len; 6031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (shift < end) 6041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds end -= shift; 6051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else if (shift > 0) 6061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds end = 0; 6071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 6081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Position current pointer at beginning of tail, and 6091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * set remaining message length. 6101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 611d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan xdr->p = (__be32 *)((char *)iov->iov_base + padding); 612d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan xdr->end = (__be32 *)((char *)iov->iov_base + end); 6131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 614468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_read_pages); 6151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6168b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust/** 6178b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * xdr_enter_page - decode data from the XDR page 6188b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * @xdr: pointer to xdr_stream struct 6198b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * @len: number of bytes of page data 6208b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * 6218b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * Moves data beyond the current pointer position from the XDR head[] buffer 6228b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * into the page list. Any data that lies beyond current position + "len" 6238b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * bytes is moved into the XDR tail[]. The current pointer is then 6248b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * repositioned at the beginning of the first XDR page. 6258b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust */ 6268b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebustvoid xdr_enter_page(struct xdr_stream *xdr, unsigned int len) 6278b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust{ 6288b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust char * kaddr = page_address(xdr->buf->pages[0]); 6298b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust xdr_read_pages(xdr, len); 6308b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust /* 6318b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * Position current pointer at beginning of tail, and 6328b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * set remaining message length. 6338b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust */ 6348b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust if (len > PAGE_CACHE_SIZE - xdr->buf->page_base) 6358b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust len = PAGE_CACHE_SIZE - xdr->buf->page_base; 636d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan xdr->p = (__be32 *)(kaddr + xdr->buf->page_base); 637d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan xdr->end = (__be32 *)((char *)xdr->p + len); 6388b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust} 639468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_enter_page); 6408b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust 6411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct kvec empty_iov = {.iov_base = NULL, .iov_len = 0}; 6421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid 6441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsxdr_buf_from_iov(struct kvec *iov, struct xdr_buf *buf) 6451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 6461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->head[0] = *iov; 6471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->tail[0] = empty_iov; 6481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_len = 0; 6491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->buflen = buf->len = iov->iov_len; 6501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 651468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_buf_from_iov); 6521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* Sets subbuf to the portion of buf of length len beginning base bytes 6541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * from the start of buf. Returns -1 if base of length are out of bounds. */ 6551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint 6561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsxdr_buf_subsegment(struct xdr_buf *buf, struct xdr_buf *subbuf, 6571e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust unsigned int base, unsigned int len) 6581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 6591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds subbuf->buflen = subbuf->len = len; 6601e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust if (base < buf->head[0].iov_len) { 6611e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->head[0].iov_base = buf->head[0].iov_base + base; 6621e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->head[0].iov_len = min_t(unsigned int, len, 6631e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust buf->head[0].iov_len - base); 6641e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust len -= subbuf->head[0].iov_len; 6651e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust base = 0; 6661e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust } else { 6671e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->head[0].iov_base = NULL; 6681e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->head[0].iov_len = 0; 6691e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust base -= buf->head[0].iov_len; 6701e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust } 6711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (base < buf->page_len) { 6731e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->page_len = min(buf->page_len - base, len); 6741e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust base += buf->page_base; 6751e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->page_base = base & ~PAGE_CACHE_MASK; 6761e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->pages = &buf->pages[base >> PAGE_CACHE_SHIFT]; 6771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len -= subbuf->page_len; 6781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds base = 0; 6791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 6801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds base -= buf->page_len; 6811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds subbuf->page_len = 0; 6821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6841e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust if (base < buf->tail[0].iov_len) { 6851e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->tail[0].iov_base = buf->tail[0].iov_base + base; 6861e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->tail[0].iov_len = min_t(unsigned int, len, 6871e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust buf->tail[0].iov_len - base); 6881e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust len -= subbuf->tail[0].iov_len; 6891e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust base = 0; 6901e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust } else { 6911e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->tail[0].iov_base = NULL; 6921e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->tail[0].iov_len = 0; 6931e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust base -= buf->tail[0].iov_len; 6941e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust } 6951e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust 6961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (base || len) 6971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -1; 6981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 6991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 700468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_buf_subsegment); 7011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7024e3e43ad14c574281034a27420abf1993694ac11Trond Myklebuststatic void __read_bytes_from_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len) 7031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7041e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust unsigned int this_len; 7051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7064e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust this_len = min_t(unsigned int, len, subbuf->head[0].iov_len); 7074e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust memcpy(obj, subbuf->head[0].iov_base, this_len); 7081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len -= this_len; 7091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds obj += this_len; 7104e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust this_len = min_t(unsigned int, len, subbuf->page_len); 7111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (this_len) 7124e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust _copy_from_pages(obj, subbuf->pages, subbuf->page_base, this_len); 7131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len -= this_len; 7141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds obj += this_len; 7154e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust this_len = min_t(unsigned int, len, subbuf->tail[0].iov_len); 7164e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust memcpy(obj, subbuf->tail[0].iov_base, this_len); 7171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 719bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher/* obj is assumed to point to allocated memory of size at least len: */ 7204e3e43ad14c574281034a27420abf1993694ac11Trond Myklebustint read_bytes_from_xdr_buf(struct xdr_buf *buf, unsigned int base, void *obj, unsigned int len) 721bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher{ 722bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher struct xdr_buf subbuf; 723bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher int status; 724bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 725bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher status = xdr_buf_subsegment(buf, &subbuf, base, len); 7264e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust if (status != 0) 7274e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust return status; 7284e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust __read_bytes_from_xdr_buf(&subbuf, obj, len); 7294e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust return 0; 7304e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust} 731468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(read_bytes_from_xdr_buf); 7324e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust 7334e3e43ad14c574281034a27420abf1993694ac11Trond Myklebuststatic void __write_bytes_to_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len) 7344e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust{ 7354e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust unsigned int this_len; 7364e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust 7374e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust this_len = min_t(unsigned int, len, subbuf->head[0].iov_len); 7384e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust memcpy(subbuf->head[0].iov_base, obj, this_len); 739bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher len -= this_len; 740bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher obj += this_len; 7414e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust this_len = min_t(unsigned int, len, subbuf->page_len); 742bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (this_len) 7434e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust _copy_to_pages(subbuf->pages, subbuf->page_base, obj, this_len); 744bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher len -= this_len; 745bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher obj += this_len; 7464e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust this_len = min_t(unsigned int, len, subbuf->tail[0].iov_len); 7474e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust memcpy(subbuf->tail[0].iov_base, obj, this_len); 7484e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust} 7494e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust 7504e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust/* obj is assumed to point to allocated memory of size at least len: */ 7514e3e43ad14c574281034a27420abf1993694ac11Trond Myklebustint write_bytes_to_xdr_buf(struct xdr_buf *buf, unsigned int base, void *obj, unsigned int len) 7524e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust{ 7534e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust struct xdr_buf subbuf; 7544e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust int status; 7554e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust 7564e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust status = xdr_buf_subsegment(buf, &subbuf, base, len); 7574e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust if (status != 0) 7584e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust return status; 7594e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust __write_bytes_to_xdr_buf(&subbuf, obj, len); 7604e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust return 0; 761bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher} 762c43abaedaff92a7bcbfe04b593164bb5faba3078Kevin CoffmanEXPORT_SYMBOL_GPL(write_bytes_to_xdr_buf); 763bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 764bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherint 7651e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebustxdr_decode_word(struct xdr_buf *buf, unsigned int base, u32 *obj) 7661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 767d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan __be32 raw; 7681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int status; 7691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); 7711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (status) 7721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return status; 77398866b5abe1513cdacc011874ca045d40002eccdBenny Halevy *obj = be32_to_cpu(raw); 7741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 7751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 776468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_decode_word); 7771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 778bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherint 7791e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebustxdr_encode_word(struct xdr_buf *buf, unsigned int base, u32 obj) 780bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher{ 7819f162d2a810b4db48f7b8d7e734d0932c81ec2a1Benny Halevy __be32 raw = cpu_to_be32(obj); 782bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 783bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return write_bytes_to_xdr_buf(buf, base, &raw, sizeof(obj)); 784bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher} 785468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_encode_word); 786bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 7871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* If the netobj starting offset bytes from the start of xdr_buf is contained 7881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * entirely in the head or the tail, set object to point to it; otherwise 7891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * try to find space for it at the end of the tail, copy it there, and 7901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * set obj to point to it. */ 791bee57c99c322d64407b80c8171958b4384902da4Trond Myklebustint xdr_buf_read_netobj(struct xdr_buf *buf, struct xdr_netobj *obj, unsigned int offset) 7921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 793bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust struct xdr_buf subbuf; 7941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 795bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (xdr_decode_word(buf, offset, &obj->len)) 796bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust return -EFAULT; 797bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust if (xdr_buf_subsegment(buf, &subbuf, offset + 4, obj->len)) 798bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust return -EFAULT; 799bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust 800bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust /* Is the obj contained entirely in the head? */ 801bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust obj->data = subbuf.head[0].iov_base; 802bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust if (subbuf.head[0].iov_len == obj->len) 803bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust return 0; 804bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust /* ..or is the obj contained entirely in the tail? */ 805bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust obj->data = subbuf.tail[0].iov_base; 806bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust if (subbuf.tail[0].iov_len == obj->len) 807bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust return 0; 808bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust 809bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust /* use end of tail as storage for obj: 810bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust * (We don't copy to the beginning because then we'd have 811bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust * to worry about doing a potentially overlapping copy. 812bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust * This assumes the object is at most half the length of the 813bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust * tail.) */ 814bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust if (obj->len > buf->buflen - buf->len) 815bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust return -ENOMEM; 816bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust if (buf->tail[0].iov_len != 0) 817bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust obj->data = buf->tail[0].iov_base + buf->tail[0].iov_len; 818bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust else 819bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust obj->data = buf->head[0].iov_base + buf->head[0].iov_len; 820bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust __read_bytes_from_xdr_buf(&subbuf, obj->data, obj->len); 8211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 8221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 823468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_buf_read_netobj); 824bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 825bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher/* Returns 0 on success, or else a negative error code. */ 826bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherstatic int 827bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherxdr_xcode_array2(struct xdr_buf *buf, unsigned int base, 828bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher struct xdr_array2_desc *desc, int encode) 829bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher{ 830bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher char *elem = NULL, *c; 831bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher unsigned int copied = 0, todo, avail_here; 832bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher struct page **ppages = NULL; 833bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher int err; 834bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 835bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (encode) { 836bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (xdr_encode_word(buf, base, desc->array_len) != 0) 837bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return -EINVAL; 838bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } else { 839bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (xdr_decode_word(buf, base, &desc->array_len) != 0 || 84058fcb8df0bf663bb6b8f46cd3010bfe8d13d97cfTrond Myklebust desc->array_len > desc->array_maxlen || 841bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher (unsigned long) base + 4 + desc->array_len * 842bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher desc->elem_size > buf->len) 843bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return -EINVAL; 844bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 845bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base += 4; 846bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 847bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!desc->xcode) 848bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return 0; 849bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 850bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher todo = desc->array_len * desc->elem_size; 851bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 852bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher /* process head */ 853bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (todo && base < buf->head->iov_len) { 854bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c = buf->head->iov_base + base; 855bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_here = min_t(unsigned int, todo, 856bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher buf->head->iov_len - base); 857bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher todo -= avail_here; 858bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 859bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher while (avail_here >= desc->elem_size) { 860bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, c); 861bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 862bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 863bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c += desc->elem_size; 864bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_here -= desc->elem_size; 865bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 866bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (avail_here) { 867bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!elem) { 868bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher elem = kmalloc(desc->elem_size, GFP_KERNEL); 869bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = -ENOMEM; 870bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!elem) 871bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 872bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 873bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (encode) { 874bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, elem); 875bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 876bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 877bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(c, elem, avail_here); 878bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } else 879bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(elem, c, avail_here); 880bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied = avail_here; 881bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 882bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base = buf->head->iov_len; /* align to start of pages */ 883bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 884bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 885bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher /* process pages array */ 886bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base -= buf->head->iov_len; 887bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (todo && base < buf->page_len) { 888bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher unsigned int avail_page; 889bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 890bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_here = min(todo, buf->page_len - base); 891bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher todo -= avail_here; 892bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 893bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base += buf->page_base; 894bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher ppages = buf->pages + (base >> PAGE_CACHE_SHIFT); 895bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base &= ~PAGE_CACHE_MASK; 896bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_page = min_t(unsigned int, PAGE_CACHE_SIZE - base, 897bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_here); 898bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c = kmap(*ppages) + base; 899bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 900bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher while (avail_here) { 901bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_here -= avail_page; 902bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (copied || avail_page < desc->elem_size) { 903bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher unsigned int l = min(avail_page, 904bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher desc->elem_size - copied); 905bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!elem) { 906bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher elem = kmalloc(desc->elem_size, 907bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher GFP_KERNEL); 908bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = -ENOMEM; 909bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!elem) 910bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 911bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 912bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (encode) { 913bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!copied) { 914bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, elem); 915bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 916bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 917bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 918bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(c, elem + copied, l); 919bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied += l; 920bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (copied == desc->elem_size) 921bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied = 0; 922bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } else { 923bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(elem + copied, c, l); 924bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied += l; 925bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (copied == desc->elem_size) { 926bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, elem); 927bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 928bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 929bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied = 0; 930bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 931bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 932bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_page -= l; 933bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c += l; 934bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 935bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher while (avail_page >= desc->elem_size) { 936bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, c); 937bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 938bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 939bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c += desc->elem_size; 940bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_page -= desc->elem_size; 941bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 942bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (avail_page) { 943bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher unsigned int l = min(avail_page, 944bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher desc->elem_size - copied); 945bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!elem) { 946bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher elem = kmalloc(desc->elem_size, 947bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher GFP_KERNEL); 948bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = -ENOMEM; 949bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!elem) 950bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 951bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 952bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (encode) { 953bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!copied) { 954bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, elem); 955bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 956bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 957bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 958bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(c, elem + copied, l); 959bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied += l; 960bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (copied == desc->elem_size) 961bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied = 0; 962bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } else { 963bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(elem + copied, c, l); 964bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied += l; 965bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (copied == desc->elem_size) { 966bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, elem); 967bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 968bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 969bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied = 0; 970bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 971bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 972bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 973bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (avail_here) { 974bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher kunmap(*ppages); 975bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher ppages++; 976bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c = kmap(*ppages); 977bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 978bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 979bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_page = min(avail_here, 980bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher (unsigned int) PAGE_CACHE_SIZE); 981bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 982bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base = buf->page_len; /* align to start of tail */ 983bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 984bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 985bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher /* process tail */ 986bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base -= buf->page_len; 987bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (todo) { 988bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c = buf->tail->iov_base + base; 989bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (copied) { 990bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher unsigned int l = desc->elem_size - copied; 991bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 992bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (encode) 993bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(c, elem + copied, l); 994bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher else { 995bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(elem + copied, c, l); 996bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, elem); 997bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 998bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 999bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1000bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher todo -= l; 1001bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c += l; 1002bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1003bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher while (todo) { 1004bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, c); 1005bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 1006bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1007bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c += desc->elem_size; 1008bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher todo -= desc->elem_size; 1009bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1010bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1011bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = 0; 1012bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1013bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherout: 1014a51482bde22f99c63fbbb57d5d46cc666384e379Jesper Juhl kfree(elem); 1015bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (ppages) 1016bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher kunmap(*ppages); 1017bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return err; 1018bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher} 1019bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1020bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherint 1021bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherxdr_decode_array2(struct xdr_buf *buf, unsigned int base, 1022bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher struct xdr_array2_desc *desc) 1023bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher{ 1024bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (base >= buf->len) 1025bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return -EINVAL; 1026bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1027bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return xdr_xcode_array2(buf, base, desc, 0); 1028bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher} 1029468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_decode_array2); 1030bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1031bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherint 1032bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherxdr_encode_array2(struct xdr_buf *buf, unsigned int base, 1033bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher struct xdr_array2_desc *desc) 1034bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher{ 1035bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if ((unsigned long) base + 4 + desc->array_len * desc->elem_size > 1036bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher buf->head->iov_len + buf->page_len + buf->tail->iov_len) 1037bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return -EINVAL; 1038bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1039bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return xdr_xcode_array2(buf, base, desc, 1); 1040bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher} 1041468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_encode_array2); 104237a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia 104337a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaiaint 104437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaiaxdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, 1045cca5172a7ec10dfdb0b787cd8e9d5b0b8f179793YOSHIFUJI Hideaki int (*actor)(struct scatterlist *, void *), void *data) 104637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia{ 104737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia int i, ret = 0; 104837a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia unsigned page_len, thislen, page_offset; 104937a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia struct scatterlist sg[1]; 105037a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia 105168e3f5dd4db62619fdbe520d36c9ebf62e672256Herbert Xu sg_init_table(sg, 1); 105268e3f5dd4db62619fdbe520d36c9ebf62e672256Herbert Xu 105337a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (offset >= buf->head[0].iov_len) { 105437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia offset -= buf->head[0].iov_len; 105537a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia } else { 105637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = buf->head[0].iov_len - offset; 105737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (thislen > len) 105837a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = len; 105937a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia sg_set_buf(sg, buf->head[0].iov_base + offset, thislen); 106037a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia ret = actor(sg, data); 106137a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (ret) 106237a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia goto out; 106337a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia offset = 0; 106437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia len -= thislen; 106537a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia } 106637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (len == 0) 106737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia goto out; 106837a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia 106937a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (offset >= buf->page_len) { 107037a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia offset -= buf->page_len; 107137a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia } else { 107237a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia page_len = buf->page_len - offset; 107337a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (page_len > len) 107437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia page_len = len; 107537a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia len -= page_len; 107637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia page_offset = (offset + buf->page_base) & (PAGE_CACHE_SIZE - 1); 107737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia i = (offset + buf->page_base) >> PAGE_CACHE_SHIFT; 107837a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = PAGE_CACHE_SIZE - page_offset; 107937a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia do { 108037a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (thislen > page_len) 108137a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = page_len; 1082642f149031d70415d9318b919d50b71e4724adbdJens Axboe sg_set_page(sg, buf->pages[i], thislen, page_offset); 108337a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia ret = actor(sg, data); 108437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (ret) 108537a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia goto out; 108637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia page_len -= thislen; 108737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia i++; 108837a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia page_offset = 0; 108937a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = PAGE_CACHE_SIZE; 109037a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia } while (page_len != 0); 109137a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia offset = 0; 109237a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia } 109337a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (len == 0) 109437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia goto out; 109537a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (offset < buf->tail[0].iov_len) { 109637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = buf->tail[0].iov_len - offset; 109737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (thislen > len) 109837a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = len; 109937a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia sg_set_buf(sg, buf->tail[0].iov_base + offset, thislen); 110037a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia ret = actor(sg, data); 110137a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia len -= thislen; 110237a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia } 110337a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (len != 0) 110437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia ret = -EINVAL; 110537a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaiaout: 110637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia return ret; 110737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia} 1108468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_process_buf); 110937a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia 1110