xdr.c revision 3e19ce762b537dd9aeefdd0849ba5f2f01ff83cf
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 114b4687da7fc5f741af7fee9b0248a2cf2ad9c4478Chuck Lever/** 115b4687da7fc5f741af7fee9b0248a2cf2ad9c4478Chuck Lever * xdr_terminate_string - '\0'-terminate a string residing in an xdr_buf 116b4687da7fc5f741af7fee9b0248a2cf2ad9c4478Chuck Lever * @buf: XDR buffer where string resides 117b4687da7fc5f741af7fee9b0248a2cf2ad9c4478Chuck Lever * @len: length of string, in bytes 118b4687da7fc5f741af7fee9b0248a2cf2ad9c4478Chuck Lever * 119b4687da7fc5f741af7fee9b0248a2cf2ad9c4478Chuck Lever */ 120b4687da7fc5f741af7fee9b0248a2cf2ad9c4478Chuck Levervoid 121b4687da7fc5f741af7fee9b0248a2cf2ad9c4478Chuck Leverxdr_terminate_string(struct xdr_buf *buf, const u32 len) 122b4687da7fc5f741af7fee9b0248a2cf2ad9c4478Chuck Lever{ 123b4687da7fc5f741af7fee9b0248a2cf2ad9c4478Chuck Lever char *kaddr; 124b4687da7fc5f741af7fee9b0248a2cf2ad9c4478Chuck Lever 125b85417860172ff693dc115d7999805fc240cec1cCong Wang kaddr = kmap_atomic(buf->pages[0]); 126b4687da7fc5f741af7fee9b0248a2cf2ad9c4478Chuck Lever kaddr[buf->page_base + len] = '\0'; 127b85417860172ff693dc115d7999805fc240cec1cCong Wang kunmap_atomic(kaddr); 128b4687da7fc5f741af7fee9b0248a2cf2ad9c4478Chuck Lever} 1290d961aa934b799ca7369db582e52952cc50c656dTrond MyklebustEXPORT_SYMBOL_GPL(xdr_terminate_string); 130b4687da7fc5f741af7fee9b0248a2cf2ad9c4478Chuck Lever 1311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid 1321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsxdr_inline_pages(struct xdr_buf *xdr, unsigned int offset, 1331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct page **pages, unsigned int base, unsigned int len) 1341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *head = xdr->head; 1361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *tail = xdr->tail; 1371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *buf = (char *)head->iov_base; 1381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int buflen = head->iov_len; 1391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds head->iov_len = offset; 1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->pages = pages; 1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->page_base = base; 1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->page_len = len; 1451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tail->iov_base = buf + offset; 1471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tail->iov_len = buflen - offset; 1481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->buflen += len; 1501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 151468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_inline_pages); 1521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Helper routines for doing 'memmove' like operations on a struct xdr_buf 1552c53040f018b6c36a46eec75b9b937aaa5f78e6dBen Hutchings */ 1562c53040f018b6c36a46eec75b9b937aaa5f78e6dBen Hutchings 1572c53040f018b6c36a46eec75b9b937aaa5f78e6dBen Hutchings/** 1581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * _shift_data_right_pages 1591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pages: vector of pages containing both the source and dest memory area. 1601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pgto_base: page vector address of destination 1611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pgfrom_base: page vector address of source 1621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: number of bytes to copy 1631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Note: the addresses pgto_base and pgfrom_base are both calculated in 1651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * the same way: 1661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * if a memory area starts at byte 'base' in page 'pages[i]', 1671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * then its address is given as (i << PAGE_CACHE_SHIFT) + base 1681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Also note: pgfrom_base must be < pgto_base, but the memory areas 1691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * they point to may overlap. 1701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void 1721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds_shift_data_right_pages(struct page **pages, size_t pgto_base, 1731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t pgfrom_base, size_t len) 1741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct page **pgfrom, **pgto; 1761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *vfrom, *vto; 1771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t copy; 1781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BUG_ON(pgto_base <= pgfrom_base); 1801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgto_base += len; 1821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgfrom_base += len; 1831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgto = pages + (pgto_base >> PAGE_CACHE_SHIFT); 1851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgfrom = pages + (pgfrom_base >> PAGE_CACHE_SHIFT); 1861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgto_base &= ~PAGE_CACHE_MASK; 1881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgfrom_base &= ~PAGE_CACHE_MASK; 1891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds do { 1911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Are any pointers crossing a page boundary? */ 1921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (pgto_base == 0) { 1931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgto_base = PAGE_CACHE_SIZE; 1941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgto--; 1951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (pgfrom_base == 0) { 1971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgfrom_base = PAGE_CACHE_SIZE; 1981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgfrom--; 1991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = len; 2021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy > pgto_base) 2031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = pgto_base; 2041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy > pgfrom_base) 2051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = pgfrom_base; 2061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgto_base -= copy; 2071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgfrom_base -= copy; 2081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 209b85417860172ff693dc115d7999805fc240cec1cCong Wang vto = kmap_atomic(*pgto); 210347e2233b7667e336d9f671f1a52dfa3f0416e2cTrond Myklebust if (*pgto != *pgfrom) { 211347e2233b7667e336d9f671f1a52dfa3f0416e2cTrond Myklebust vfrom = kmap_atomic(*pgfrom); 212347e2233b7667e336d9f671f1a52dfa3f0416e2cTrond Myklebust memcpy(vto + pgto_base, vfrom + pgfrom_base, copy); 213347e2233b7667e336d9f671f1a52dfa3f0416e2cTrond Myklebust kunmap_atomic(vfrom); 214347e2233b7667e336d9f671f1a52dfa3f0416e2cTrond Myklebust } else 215347e2233b7667e336d9f671f1a52dfa3f0416e2cTrond Myklebust memmove(vto + pgto_base, vto + pgfrom_base, copy); 216bce3481c91801665e17f8daf59ede946129f3d3fTrond Myklebust flush_dcache_page(*pgto); 217b85417860172ff693dc115d7999805fc240cec1cCong Wang kunmap_atomic(vto); 2181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } while ((len -= copy) != 0); 2201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2222c53040f018b6c36a46eec75b9b937aaa5f78e6dBen Hutchings/** 2231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * _copy_to_pages 2241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pages: array of pages 2251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pgbase: page vector address of destination 2261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @p: pointer to source data 2271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: length 2281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copies data from an arbitrary memory location into an array of pages 2301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The copy is assumed to be non-overlapping. 2311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void 2331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds_copy_to_pages(struct page **pages, size_t pgbase, const char *p, size_t len) 2341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct page **pgto; 2361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *vto; 2371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t copy; 2381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgto = pages + (pgbase >> PAGE_CACHE_SHIFT); 2401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgbase &= ~PAGE_CACHE_MASK; 2411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 242daeba89d43af0fa469d38a4ccdc32fff8ca17c2eTrond Myklebust for (;;) { 2431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = PAGE_CACHE_SIZE - pgbase; 2441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy > len) 2451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = len; 2461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 247b85417860172ff693dc115d7999805fc240cec1cCong Wang vto = kmap_atomic(*pgto); 2481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memcpy(vto + pgbase, p, copy); 249b85417860172ff693dc115d7999805fc240cec1cCong Wang kunmap_atomic(vto); 2501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 251daeba89d43af0fa469d38a4ccdc32fff8ca17c2eTrond Myklebust len -= copy; 252daeba89d43af0fa469d38a4ccdc32fff8ca17c2eTrond Myklebust if (len == 0) 253daeba89d43af0fa469d38a4ccdc32fff8ca17c2eTrond Myklebust break; 254daeba89d43af0fa469d38a4ccdc32fff8ca17c2eTrond Myklebust 2551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgbase += copy; 2561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (pgbase == PAGE_CACHE_SIZE) { 2571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds flush_dcache_page(*pgto); 2581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgbase = 0; 2591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgto++; 2601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds p += copy; 262daeba89d43af0fa469d38a4ccdc32fff8ca17c2eTrond Myklebust } 2631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds flush_dcache_page(*pgto); 2641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2662c53040f018b6c36a46eec75b9b937aaa5f78e6dBen Hutchings/** 2671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * _copy_from_pages 2681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @p: pointer to destination 2691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pages: array of pages 2701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pgbase: offset of source data 2711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: length 2721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copies data into an arbitrary memory location from an array of pages 2741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The copy is assumed to be non-overlapping. 2751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 276bf118a342f10dafe44b14451a1392c3254629a1fAndy Adamsonvoid 2771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds_copy_from_pages(char *p, struct page **pages, size_t pgbase, size_t len) 2781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct page **pgfrom; 2801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *vfrom; 2811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t copy; 2821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgfrom = pages + (pgbase >> PAGE_CACHE_SHIFT); 2841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgbase &= ~PAGE_CACHE_MASK; 2851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds do { 2871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = PAGE_CACHE_SIZE - pgbase; 2881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy > len) 2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = len; 2901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 291b85417860172ff693dc115d7999805fc240cec1cCong Wang vfrom = kmap_atomic(*pgfrom); 2921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memcpy(p, vfrom + pgbase, copy); 293b85417860172ff693dc115d7999805fc240cec1cCong Wang kunmap_atomic(vfrom); 2941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgbase += copy; 2961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (pgbase == PAGE_CACHE_SIZE) { 2971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgbase = 0; 2981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgfrom++; 2991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds p += copy; 3011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } while ((len -= copy) != 0); 3031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 304bf118a342f10dafe44b14451a1392c3254629a1fAndy AdamsonEXPORT_SYMBOL_GPL(_copy_from_pages); 3051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3062c53040f018b6c36a46eec75b9b937aaa5f78e6dBen Hutchings/** 3071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_shrink_bufhead 3081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @buf: xdr_buf 3091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: bytes to remove from buf->head[0] 3101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 311cca5172a7ec10dfdb0b787cd8e9d5b0b8f179793YOSHIFUJI Hideaki * Shrinks XDR buffer's header kvec buf->head[0] by 3121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 'len' bytes. The extra data is not lost, but is instead 3131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * moved into the inlined pages and/or the tail. 3141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void 3161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsxdr_shrink_bufhead(struct xdr_buf *buf, size_t len) 3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *head, *tail; 3191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t copy, offs; 3201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int pglen = buf->page_len; 3211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tail = buf->tail; 3231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds head = buf->head; 32418e624ad0374f3b1092530f978301611f88e45b3Weston Andros Adamson 32518e624ad0374f3b1092530f978301611f88e45b3Weston Andros Adamson WARN_ON_ONCE(len > head->iov_len); 32618e624ad0374f3b1092530f978301611f88e45b3Weston Andros Adamson if (len > head->iov_len) 32718e624ad0374f3b1092530f978301611f88e45b3Weston Andros Adamson len = head->iov_len; 3281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Shift the tail first */ 3301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (tail->iov_len != 0) { 3311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (tail->iov_len > len) { 3321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = tail->iov_len - len; 3331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memmove((char *)tail->iov_base + len, 3341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tail->iov_base, copy); 3351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Copy from the inlined pages into the tail */ 3371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = len; 3381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy > pglen) 3391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = pglen; 3401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds offs = len - copy; 3411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (offs >= tail->iov_len) 3421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = 0; 3431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else if (copy > tail->iov_len - offs) 3441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = tail->iov_len - offs; 3451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy != 0) 3461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds _copy_from_pages((char *)tail->iov_base + offs, 3471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->pages, 3481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_base + pglen + offs - len, 3491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy); 3501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Do we also need to copy data from the head into the tail ? */ 3511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (len > pglen) { 3521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds offs = copy = len - pglen; 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy > tail->iov_len) 3541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = tail->iov_len; 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memcpy(tail->iov_base, 3561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (char *)head->iov_base + 3571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds head->iov_len - offs, 3581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy); 3591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Now handle pages */ 3621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (pglen != 0) { 3631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (pglen > len) 3641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds _shift_data_right_pages(buf->pages, 3651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_base + len, 3661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_base, 3671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pglen - len); 3681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = len; 3691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (len > pglen) 3701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = pglen; 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds _copy_to_pages(buf->pages, buf->page_base, 3721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (char *)head->iov_base + head->iov_len - len, 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy); 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds head->iov_len -= len; 3761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->buflen -= len; 3771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Have we truncated the message? */ 3781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (buf->len > buf->buflen) 3791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->len = buf->buflen; 3801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3822c53040f018b6c36a46eec75b9b937aaa5f78e6dBen Hutchings/** 3831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_shrink_pagelen 3841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @buf: xdr_buf 3851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: bytes to remove from buf->pages 3861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 387cca5172a7ec10dfdb0b787cd8e9d5b0b8f179793YOSHIFUJI Hideaki * Shrinks XDR buffer's page array buf->pages by 3881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 'len' bytes. The extra data is not lost, but is instead 3891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * moved into the tail. 3901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void 3921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsxdr_shrink_pagelen(struct xdr_buf *buf, size_t len) 3931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *tail; 3951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t copy; 3961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int pglen = buf->page_len; 397cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust unsigned int tailbuf_len; 3981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tail = buf->tail; 4001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BUG_ON (len > pglen); 4011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 402cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust tailbuf_len = buf->buflen - buf->head->iov_len - buf->page_len; 403cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust 4041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Shift the tail first */ 405cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust if (tailbuf_len != 0) { 406cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust unsigned int free_space = tailbuf_len - tail->iov_len; 407cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust 408cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust if (len < free_space) 409cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust free_space = len; 410cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust tail->iov_len += free_space; 411cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust 41242d6d8ab51ca04afcb8a64759076da624cdb71e8Benny Halevy copy = len; 4131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (tail->iov_len > len) { 4140fe62a35903e11fb41b492bd5b0e8e4c751d5c94Benny Halevy char *p = (char *)tail->iov_base + len; 4152e29ebb8119e6037133921fac09cc5f9d625b511Benny Halevy memmove(p, tail->iov_base, tail->iov_len - len); 41642d6d8ab51ca04afcb8a64759076da624cdb71e8Benny Halevy } else 4171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = tail->iov_len; 41842d6d8ab51ca04afcb8a64759076da624cdb71e8Benny Halevy /* Copy from the inlined pages into the tail */ 4191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds _copy_from_pages((char *)tail->iov_base, 4201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->pages, buf->page_base + pglen - len, 4211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy); 4221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_len -= len; 4241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->buflen -= len; 4251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Have we truncated the message? */ 4261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (buf->len > buf->buflen) 4271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->len = buf->buflen; 4281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid 4311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsxdr_shift_buf(struct xdr_buf *buf, size_t len) 4321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr_shrink_bufhead(buf, len); 4341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 435468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_shift_buf); 4361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 4384517d526c8aa31b5c14165ef180cc19518ff0a35Trond Myklebust * xdr_stream_pos - Return the current offset from the start of the xdr_stream 4394517d526c8aa31b5c14165ef180cc19518ff0a35Trond Myklebust * @xdr: pointer to struct xdr_stream 4404517d526c8aa31b5c14165ef180cc19518ff0a35Trond Myklebust */ 4414517d526c8aa31b5c14165ef180cc19518ff0a35Trond Myklebustunsigned int xdr_stream_pos(const struct xdr_stream *xdr) 4424517d526c8aa31b5c14165ef180cc19518ff0a35Trond Myklebust{ 4434517d526c8aa31b5c14165ef180cc19518ff0a35Trond Myklebust return (unsigned int)(XDR_QUADLEN(xdr->buf->len) - xdr->nwords) << 2; 4444517d526c8aa31b5c14165ef180cc19518ff0a35Trond Myklebust} 4454517d526c8aa31b5c14165ef180cc19518ff0a35Trond MyklebustEXPORT_SYMBOL_GPL(xdr_stream_pos); 4464517d526c8aa31b5c14165ef180cc19518ff0a35Trond Myklebust 4474517d526c8aa31b5c14165ef180cc19518ff0a35Trond Myklebust/** 4481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_init_encode - Initialize a struct xdr_stream for sending data. 4491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @xdr: pointer to xdr_stream struct 4501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @buf: pointer to XDR buffer in which to encode data 4511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @p: current pointer inside XDR buffer 4521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 4531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Note: at the moment the RPC client only passes the length of our 4541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * scratch buffer in the xdr_buf's header kvec. Previously this 4551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * meant we needed to call xdr_adjust_iovec() after encoding the 4561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * data. With the new scheme, the xdr_stream manages the details 4571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * of the buffer length, and takes care of adjusting the kvec 4581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * length for us. 4591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 460d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyanvoid xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p) 4611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *iov = buf->head; 463334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust int scratch_len = buf->buflen - buf->page_len - buf->tail[0].iov_len; 4641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 465334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust BUG_ON(scratch_len < 0); 4661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->buf = buf; 4671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->iov = iov; 468d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan xdr->p = (__be32 *)((char *)iov->iov_base + iov->iov_len); 469d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan xdr->end = (__be32 *)((char *)iov->iov_base + scratch_len); 470334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust BUG_ON(iov->iov_len > scratch_len); 471334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust 472334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust if (p != xdr->p && p != NULL) { 473334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust size_t len; 474334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust 475334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust BUG_ON(p < xdr->p || p > xdr->end); 476334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust len = (char *)p - (char *)xdr->p; 477334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust xdr->p = p; 478334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust buf->len += len; 479334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust iov->iov_len += len; 480334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust } 4811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 482468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_init_encode); 4831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 4851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_reserve_space - Reserve buffer space for sending 4861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @xdr: pointer to xdr_stream 4871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @nbytes: number of bytes to reserve 4881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 4891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Checks that we have enough buffer space to encode 'nbytes' more 4901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * bytes of data. If so, update the total xdr_buf length, and 4911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * adjust the length of the current kvec. 4921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 493d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan__be32 * xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes) 4941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 495d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan __be32 *p = xdr->p; 496d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan __be32 *q; 4971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* align nbytes on the next 32-bit boundary */ 4991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds nbytes += 3; 5001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds nbytes &= ~3; 5011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds q = p + (nbytes >> 2); 5021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (unlikely(q > xdr->end || q < p)) 5031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 5041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->p = q; 5051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->iov->iov_len += nbytes; 5061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->buf->len += nbytes; 5071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return p; 5081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 509468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_reserve_space); 5101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 5123e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields * xdr_truncate_encode - truncate an encode buffer 5133e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields * @xdr: pointer to xdr_stream 5143e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields * @len: new length of buffer 5153e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields * 5163e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields * Truncates the xdr stream, so that xdr->buf->len == len, 5173e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields * and xdr->p points at offset len from the start of the buffer, and 5183e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields * head, tail, and page lengths are adjusted to correspond. 5193e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields * 5203e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields * If this means moving xdr->p to a different buffer, we assume that 5213e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields * that the end pointer should be set to the end of the current page, 5223e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields * except in the case of the head buffer when we assume the head 5233e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields * buffer's current length represents the end of the available buffer. 5243e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields * 5253e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields * This is *not* safe to use on a buffer that already has inlined page 5263e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields * cache pages (as in a zero-copy server read reply), except for the 5273e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields * simple case of truncating from one position in the tail to another. 5283e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields * 5293e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields */ 5303e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fieldsvoid xdr_truncate_encode(struct xdr_stream *xdr, size_t len) 5313e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields{ 5323e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields struct xdr_buf *buf = xdr->buf; 5333e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields struct kvec *head = buf->head; 5343e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields struct kvec *tail = buf->tail; 5353e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields int fraglen; 5363e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields int new, old; 5373e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields 5383e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields if (len > buf->len) { 5393e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields WARN_ON_ONCE(1); 5403e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields return; 5413e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields } 5423e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields 5433e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields fraglen = min_t(int, buf->len - len, tail->iov_len); 5443e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields tail->iov_len -= fraglen; 5453e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields buf->len -= fraglen; 5463e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields if (tail->iov_len && buf->len == len) { 5473e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields xdr->p = tail->iov_base + tail->iov_len; 5483e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields /* xdr->end, xdr->iov should be set already */ 5493e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields return; 5503e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields } 5513e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields WARN_ON_ONCE(fraglen); 5523e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields fraglen = min_t(int, buf->len - len, buf->page_len); 5533e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields buf->page_len -= fraglen; 5543e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields buf->len -= fraglen; 5553e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields 5563e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields new = buf->page_base + buf->page_len; 5573e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields old = new + fraglen; 5583e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields xdr->page_ptr -= (old >> PAGE_SHIFT) - (new >> PAGE_SHIFT); 5593e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields 5603e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields if (buf->page_len && buf->len == len) { 5613e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields xdr->p = page_address(*xdr->page_ptr); 5623e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields xdr->end = (void *)xdr->p + PAGE_SIZE; 5633e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields xdr->p = (void *)xdr->p + (new % PAGE_SIZE); 5643e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields /* xdr->iov should already be NULL */ 5653e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields return; 5663e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields } 5673e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields if (fraglen) 5683e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields xdr->end = head->iov_base + head->iov_len; 5693e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields /* (otherwise assume xdr->end is already set) */ 5703e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields head->iov_len = len; 5713e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields buf->len = len; 5723e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields xdr->p = head->iov_base + head->iov_len; 5733e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields xdr->iov = buf->head; 5743e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields} 5753e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce FieldsEXPORT_SYMBOL(xdr_truncate_encode); 5763e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields 5773e19ce762b537dd9aeefdd0849ba5f2f01ff83cfJ. Bruce Fields/** 5781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_write_pages - Insert a list of pages into an XDR buffer for sending 5791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @xdr: pointer to xdr_stream 5801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pages: list of pages 5811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @base: offset of first byte 5821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: length of data in bytes 5831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 5841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 5851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid xdr_write_pages(struct xdr_stream *xdr, struct page **pages, unsigned int base, 5861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int len) 5871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct xdr_buf *buf = xdr->buf; 5891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *iov = buf->tail; 5901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->pages = pages; 5911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_base = base; 5921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_len = len; 5931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iov->iov_base = (char *)xdr->p; 5951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iov->iov_len = 0; 5961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->iov = iov; 5971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (len & 3) { 5991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int pad = 4 - (len & 3); 6001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BUG_ON(xdr->p >= xdr->end); 6021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iov->iov_base = (char *)xdr->p + (len & 3); 6031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iov->iov_len += pad; 6041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len += pad; 6051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *xdr->p++ = 0; 6061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->buflen += len; 6081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->len += len; 6091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 610468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_write_pages); 6111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6126650239a4b01077e80d5a4468562756d77afaa59Trond Myklebuststatic void xdr_set_iov(struct xdr_stream *xdr, struct kvec *iov, 6131537693ceaa8d6484f1ce631bec85658bfa9816cTrond Myklebust unsigned int len) 6146650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust{ 6156650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (len > iov->iov_len) 6166650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust len = iov->iov_len; 6171537693ceaa8d6484f1ce631bec85658bfa9816cTrond Myklebust xdr->p = (__be32*)iov->iov_base; 6186650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->end = (__be32*)(iov->iov_base + len); 6196650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->iov = iov; 6206650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->page_ptr = NULL; 6216650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust} 6226650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 6236650239a4b01077e80d5a4468562756d77afaa59Trond Myklebuststatic int xdr_set_page_base(struct xdr_stream *xdr, 6246650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust unsigned int base, unsigned int len) 6256650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust{ 6266650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust unsigned int pgnr; 6276650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust unsigned int maxlen; 6286650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust unsigned int pgoff; 6296650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust unsigned int pgend; 6306650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust void *kaddr; 6316650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 6326650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust maxlen = xdr->buf->page_len; 6336650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (base >= maxlen) 6346650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return -EINVAL; 6356650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust maxlen -= base; 6366650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (len > maxlen) 6376650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust len = maxlen; 6386650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 6396650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust base += xdr->buf->page_base; 6406650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 6416650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust pgnr = base >> PAGE_SHIFT; 6426650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->page_ptr = &xdr->buf->pages[pgnr]; 6436650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust kaddr = page_address(*xdr->page_ptr); 6446650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 6456650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust pgoff = base & ~PAGE_MASK; 6466650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->p = (__be32*)(kaddr + pgoff); 6476650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 6486650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust pgend = pgoff + len; 6496650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (pgend > PAGE_SIZE) 6506650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust pgend = PAGE_SIZE; 6516650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->end = (__be32*)(kaddr + pgend); 6526650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->iov = NULL; 6536650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return 0; 6546650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust} 6556650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 6566650239a4b01077e80d5a4468562756d77afaa59Trond Myklebuststatic void xdr_set_next_page(struct xdr_stream *xdr) 6576650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust{ 6586650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust unsigned int newbase; 6596650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 6606650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust newbase = (1 + xdr->page_ptr - xdr->buf->pages) << PAGE_SHIFT; 6616650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust newbase -= xdr->buf->page_base; 6626650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 6636650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (xdr_set_page_base(xdr, newbase, PAGE_SIZE) < 0) 6641537693ceaa8d6484f1ce631bec85658bfa9816cTrond Myklebust xdr_set_iov(xdr, xdr->buf->tail, xdr->buf->len); 6656650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust} 6666650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 6676650239a4b01077e80d5a4468562756d77afaa59Trond Myklebuststatic bool xdr_set_next_buffer(struct xdr_stream *xdr) 6686650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust{ 6696650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (xdr->page_ptr != NULL) 6706650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr_set_next_page(xdr); 6716650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust else if (xdr->iov == xdr->buf->head) { 6726650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (xdr_set_page_base(xdr, 0, PAGE_SIZE) < 0) 6731537693ceaa8d6484f1ce631bec85658bfa9816cTrond Myklebust xdr_set_iov(xdr, xdr->buf->tail, xdr->buf->len); 6746650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust } 6756650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return xdr->p != xdr->end; 6766650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust} 6776650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 6781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 6791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_init_decode - Initialize an xdr_stream for decoding data. 6801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @xdr: pointer to xdr_stream struct 6811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @buf: pointer to XDR buffer from which to decode data 6821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @p: current pointer inside XDR buffer 6831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 684d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyanvoid xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p) 6851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 6861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->buf = buf; 6876650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->scratch.iov_base = NULL; 6886650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->scratch.iov_len = 0; 689bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust xdr->nwords = XDR_QUADLEN(buf->len); 6906650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (buf->head[0].iov_len != 0) 6911537693ceaa8d6484f1ce631bec85658bfa9816cTrond Myklebust xdr_set_iov(xdr, buf->head, buf->len); 6926650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust else if (buf->page_len != 0) 6936650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr_set_page_base(xdr, 0, buf->len); 694bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust if (p != NULL && p > xdr->p && xdr->end >= p) { 695bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust xdr->nwords -= p - xdr->p; 6961537693ceaa8d6484f1ce631bec85658bfa9816cTrond Myklebust xdr->p = p; 697bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust } 6981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 699468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_init_decode); 7001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 701f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy/** 702f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy * xdr_init_decode - Initialize an xdr_stream for decoding data. 703f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy * @xdr: pointer to xdr_stream struct 704f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy * @buf: pointer to XDR buffer from which to decode data 705f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy * @pages: list of pages to decode into 706f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy * @len: length in bytes of buffer in pages 707f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy */ 708f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevyvoid xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf, 709f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy struct page **pages, unsigned int len) 710f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy{ 711f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy memset(buf, 0, sizeof(*buf)); 712f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy buf->pages = pages; 713f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy buf->page_len = len; 714f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy buf->buflen = len; 715f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy buf->len = len; 716f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy xdr_init_decode(xdr, buf, NULL); 717f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy} 718f7da7a129d57bfe0f74573dc03531c63e1360faeBenny HalevyEXPORT_SYMBOL_GPL(xdr_init_decode_pages); 719f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy 7206650239a4b01077e80d5a4468562756d77afaa59Trond Myklebuststatic __be32 * __xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes) 721ba8e452a4fe64a51b74d43761e14d99f0666cc45Trond Myklebust{ 722bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust unsigned int nwords = XDR_QUADLEN(nbytes); 723ba8e452a4fe64a51b74d43761e14d99f0666cc45Trond Myklebust __be32 *p = xdr->p; 724bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust __be32 *q = p + nwords; 725ba8e452a4fe64a51b74d43761e14d99f0666cc45Trond Myklebust 726bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust if (unlikely(nwords > xdr->nwords || q > xdr->end || q < p)) 727ba8e452a4fe64a51b74d43761e14d99f0666cc45Trond Myklebust return NULL; 7286650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->p = q; 729bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust xdr->nwords -= nwords; 730ba8e452a4fe64a51b74d43761e14d99f0666cc45Trond Myklebust return p; 731ba8e452a4fe64a51b74d43761e14d99f0666cc45Trond Myklebust} 732ba8e452a4fe64a51b74d43761e14d99f0666cc45Trond Myklebust 733ba8e452a4fe64a51b74d43761e14d99f0666cc45Trond Myklebust/** 7346650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * xdr_set_scratch_buffer - Attach a scratch buffer for decoding data. 7356650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * @xdr: pointer to xdr_stream struct 7366650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * @buf: pointer to an empty buffer 7376650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * @buflen: size of 'buf' 7386650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * 7396650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * The scratch buffer is used when decoding from an array of pages. 7406650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * If an xdr_inline_decode() call spans across page boundaries, then 7416650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * we copy the data into the scratch buffer in order to allow linear 7426650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * access. 7436650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust */ 7446650239a4b01077e80d5a4468562756d77afaa59Trond Myklebustvoid xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen) 7456650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust{ 7466650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->scratch.iov_base = buf; 7476650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->scratch.iov_len = buflen; 7486650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust} 7496650239a4b01077e80d5a4468562756d77afaa59Trond MyklebustEXPORT_SYMBOL_GPL(xdr_set_scratch_buffer); 7506650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 7516650239a4b01077e80d5a4468562756d77afaa59Trond Myklebuststatic __be32 *xdr_copy_to_scratch(struct xdr_stream *xdr, size_t nbytes) 7526650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust{ 7536650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust __be32 *p; 7546650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust void *cpdest = xdr->scratch.iov_base; 7556650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust size_t cplen = (char *)xdr->end - (char *)xdr->p; 7566650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 7576650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (nbytes > xdr->scratch.iov_len) 7586650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return NULL; 7596650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust memcpy(cpdest, xdr->p, cplen); 7606650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust cpdest += cplen; 7616650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust nbytes -= cplen; 7626650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (!xdr_set_next_buffer(xdr)) 7636650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return NULL; 7646650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust p = __xdr_inline_decode(xdr, nbytes); 7656650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (p == NULL) 7666650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return NULL; 7676650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust memcpy(cpdest, p, nbytes); 7686650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return xdr->scratch.iov_base; 7696650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust} 7706650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 7716650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust/** 7726650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * xdr_inline_decode - Retrieve XDR data to decode 7731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @xdr: pointer to xdr_stream struct 7741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @nbytes: number of bytes of data to decode 7751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 7761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Check if the input buffer is long enough to enable us to decode 7771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 'nbytes' more bytes of data starting at the current position. 7781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * If so return the current pointer, then update the current 7791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * pointer position. 7801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 781d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan__be32 * xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes) 7821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7836650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust __be32 *p; 7841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7856650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (nbytes == 0) 7866650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return xdr->p; 7876650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (xdr->p == xdr->end && !xdr_set_next_buffer(xdr)) 7881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 7896650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust p = __xdr_inline_decode(xdr, nbytes); 7906650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (p != NULL) 7916650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return p; 7926650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return xdr_copy_to_scratch(xdr, nbytes); 7931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 794468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_inline_decode); 7951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7963994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebuststatic unsigned int xdr_align_pages(struct xdr_stream *xdr, unsigned int len) 7971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct xdr_buf *buf = xdr->buf; 7991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *iov; 800bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust unsigned int nwords = XDR_QUADLEN(len); 801b760b3131d962dd35925fb65956afe621fa65ec4Trond Myklebust unsigned int cur = xdr_stream_pos(xdr); 8021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 803bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust if (xdr->nwords == 0) 804c337d3655ce85e12c7c476cb81406521926cacd2Trond Myklebust return 0; 8051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Realign pages to current pointer position */ 8061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iov = buf->head; 807a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust if (iov->iov_len > cur) { 808b760b3131d962dd35925fb65956afe621fa65ec4Trond Myklebust xdr_shrink_bufhead(buf, iov->iov_len - cur); 809a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust xdr->nwords = XDR_QUADLEN(buf->len - cur); 810a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust } 8111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 812a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust if (nwords > xdr->nwords) { 813a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust nwords = xdr->nwords; 814a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust len = nwords << 2; 815a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust } 816a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust if (buf->page_len <= len) 8178a9a8b8332b92b13316cf49685b5dc5257cfe115Trond Myklebust len = buf->page_len; 818a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust else if (nwords < xdr->nwords) { 819a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust /* Truncate page data and move it into the tail */ 820a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust xdr_shrink_pagelen(buf, buf->page_len - len); 821a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust xdr->nwords = XDR_QUADLEN(buf->len - cur); 822a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust } 8233994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust return len; 8243994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust} 825bd00f84bc57f42df32c728e86329a5c30f221657Trond Myklebust 8261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 8271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_read_pages - Ensure page-based XDR data to decode is aligned at current pointer position 8281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @xdr: pointer to xdr_stream struct 8291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: number of bytes of page data 8301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 8311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Moves data beyond the current pointer position from the XDR head[] buffer 8321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * into the page list. Any data that lies beyond current position + "len" 8338b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * bytes is moved into the XDR tail[]. 8343994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust * 8353994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust * Returns the number of XDR encoded bytes now contained in the pages 8361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 8373994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebustunsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len) 8381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct xdr_buf *buf = xdr->buf; 8401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *iov; 8413994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust unsigned int nwords; 8421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int end; 8433994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust unsigned int padding; 8441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8453994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust len = xdr_align_pages(xdr, len); 8463994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust if (len == 0) 8473994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust return 0; 8483994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust nwords = XDR_QUADLEN(len); 849bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust padding = (nwords << 2) - len; 8501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->iov = iov = buf->tail; 8511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Compute remaining message length. */ 852bd00f84bc57f42df32c728e86329a5c30f221657Trond Myklebust end = ((xdr->nwords - nwords) << 2) + padding; 853bd00f84bc57f42df32c728e86329a5c30f221657Trond Myklebust if (end > iov->iov_len) 854bd00f84bc57f42df32c728e86329a5c30f221657Trond Myklebust end = iov->iov_len; 855bd00f84bc57f42df32c728e86329a5c30f221657Trond Myklebust 8561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 8571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Position current pointer at beginning of tail, and 8581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * set remaining message length. 8591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 860d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan xdr->p = (__be32 *)((char *)iov->iov_base + padding); 861d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan xdr->end = (__be32 *)((char *)iov->iov_base + end); 86276cacaabf15a593833d96a65a1a251002bd88178Trond Myklebust xdr->page_ptr = NULL; 863bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust xdr->nwords = XDR_QUADLEN(end - padding); 864c337d3655ce85e12c7c476cb81406521926cacd2Trond Myklebust return len; 8651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 866468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_read_pages); 8671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8688b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust/** 8698b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * xdr_enter_page - decode data from the XDR page 8708b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * @xdr: pointer to xdr_stream struct 8718b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * @len: number of bytes of page data 8728b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * 8738b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * Moves data beyond the current pointer position from the XDR head[] buffer 8748b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * into the page list. Any data that lies beyond current position + "len" 8758b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * bytes is moved into the XDR tail[]. The current pointer is then 8768b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * repositioned at the beginning of the first XDR page. 8778b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust */ 8788b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebustvoid xdr_enter_page(struct xdr_stream *xdr, unsigned int len) 8798b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust{ 880f8bb7f08549a1ced9ceb69a9bd5e163122044ab2Trond Myklebust len = xdr_align_pages(xdr, len); 8818b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust /* 8828b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * Position current pointer at beginning of tail, and 8838b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * set remaining message length. 8848b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust */ 885f8bb7f08549a1ced9ceb69a9bd5e163122044ab2Trond Myklebust if (len != 0) 886f8bb7f08549a1ced9ceb69a9bd5e163122044ab2Trond Myklebust xdr_set_page_base(xdr, 0, len); 8878b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust} 888468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_enter_page); 8898b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust 8901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct kvec empty_iov = {.iov_base = NULL, .iov_len = 0}; 8911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid 8931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsxdr_buf_from_iov(struct kvec *iov, struct xdr_buf *buf) 8941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->head[0] = *iov; 8961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->tail[0] = empty_iov; 8971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_len = 0; 8981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->buflen = buf->len = iov->iov_len; 8991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 900468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_buf_from_iov); 9011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 902de4aee2e0a376fb272f44139150115a6dec1da95J. Bruce Fields/** 903de4aee2e0a376fb272f44139150115a6dec1da95J. Bruce Fields * xdr_buf_subsegment - set subbuf to a portion of buf 904de4aee2e0a376fb272f44139150115a6dec1da95J. Bruce Fields * @buf: an xdr buffer 905de4aee2e0a376fb272f44139150115a6dec1da95J. Bruce Fields * @subbuf: the result buffer 906de4aee2e0a376fb272f44139150115a6dec1da95J. Bruce Fields * @base: beginning of range in bytes 907de4aee2e0a376fb272f44139150115a6dec1da95J. Bruce Fields * @len: length of range in bytes 908de4aee2e0a376fb272f44139150115a6dec1da95J. Bruce Fields * 909de4aee2e0a376fb272f44139150115a6dec1da95J. Bruce Fields * sets @subbuf to an xdr buffer representing the portion of @buf of 910de4aee2e0a376fb272f44139150115a6dec1da95J. Bruce Fields * length @len starting at offset @base. 911de4aee2e0a376fb272f44139150115a6dec1da95J. Bruce Fields * 912de4aee2e0a376fb272f44139150115a6dec1da95J. Bruce Fields * @buf and @subbuf may be pointers to the same struct xdr_buf. 913de4aee2e0a376fb272f44139150115a6dec1da95J. Bruce Fields * 914de4aee2e0a376fb272f44139150115a6dec1da95J. Bruce Fields * Returns -1 if base of length are out of bounds. 915de4aee2e0a376fb272f44139150115a6dec1da95J. Bruce Fields */ 9161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint 9171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsxdr_buf_subsegment(struct xdr_buf *buf, struct xdr_buf *subbuf, 9181e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust unsigned int base, unsigned int len) 9191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 9201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds subbuf->buflen = subbuf->len = len; 9211e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust if (base < buf->head[0].iov_len) { 9221e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->head[0].iov_base = buf->head[0].iov_base + base; 9231e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->head[0].iov_len = min_t(unsigned int, len, 9241e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust buf->head[0].iov_len - base); 9251e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust len -= subbuf->head[0].iov_len; 9261e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust base = 0; 9271e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust } else { 9281e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust base -= buf->head[0].iov_len; 929de4aee2e0a376fb272f44139150115a6dec1da95J. Bruce Fields subbuf->head[0].iov_len = 0; 9301e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust } 9311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (base < buf->page_len) { 9331e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->page_len = min(buf->page_len - base, len); 9341e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust base += buf->page_base; 9351e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->page_base = base & ~PAGE_CACHE_MASK; 9361e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->pages = &buf->pages[base >> PAGE_CACHE_SHIFT]; 9371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len -= subbuf->page_len; 9381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds base = 0; 9391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 9401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds base -= buf->page_len; 9411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds subbuf->page_len = 0; 9421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9441e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust if (base < buf->tail[0].iov_len) { 9451e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->tail[0].iov_base = buf->tail[0].iov_base + base; 9461e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->tail[0].iov_len = min_t(unsigned int, len, 9471e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust buf->tail[0].iov_len - base); 9481e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust len -= subbuf->tail[0].iov_len; 9491e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust base = 0; 9501e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust } else { 9511e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust base -= buf->tail[0].iov_len; 952de4aee2e0a376fb272f44139150115a6dec1da95J. Bruce Fields subbuf->tail[0].iov_len = 0; 9531e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust } 9541e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust 9551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (base || len) 9561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -1; 9571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 9581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 959468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_buf_subsegment); 9601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9614c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton/** 9624c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton * xdr_buf_trim - lop at most "len" bytes off the end of "buf" 9634c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton * @buf: buf to be trimmed 9644c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton * @len: number of bytes to reduce "buf" by 9654c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton * 9664c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton * Trim an xdr_buf by the given number of bytes by fixing up the lengths. Note 9674c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton * that it's possible that we'll trim less than that amount if the xdr_buf is 9684c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton * too small, or if (for instance) it's all in the head and the parser has 9694c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton * already read too far into it. 9704c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton */ 9714c190e2f913f038c9c91ee63b59cd037260ba353Jeff Laytonvoid xdr_buf_trim(struct xdr_buf *buf, unsigned int len) 9724c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton{ 9734c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton size_t cur; 9744c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton unsigned int trim = len; 9754c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton 9764c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton if (buf->tail[0].iov_len) { 9774c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton cur = min_t(size_t, buf->tail[0].iov_len, trim); 9784c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton buf->tail[0].iov_len -= cur; 9794c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton trim -= cur; 9804c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton if (!trim) 9814c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton goto fix_len; 9824c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton } 9834c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton 9844c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton if (buf->page_len) { 9854c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton cur = min_t(unsigned int, buf->page_len, trim); 9864c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton buf->page_len -= cur; 9874c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton trim -= cur; 9884c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton if (!trim) 9894c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton goto fix_len; 9904c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton } 9914c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton 9924c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton if (buf->head[0].iov_len) { 9934c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton cur = min_t(size_t, buf->head[0].iov_len, trim); 9944c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton buf->head[0].iov_len -= cur; 9954c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton trim -= cur; 9964c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton } 9974c190e2f913f038c9c91ee63b59cd037260ba353Jeff Laytonfix_len: 9984c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton buf->len -= (len - trim); 9994c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton} 10004c190e2f913f038c9c91ee63b59cd037260ba353Jeff LaytonEXPORT_SYMBOL_GPL(xdr_buf_trim); 10014c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton 10024e3e43ad14c574281034a27420abf1993694ac11Trond Myklebuststatic void __read_bytes_from_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len) 10031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 10041e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust unsigned int this_len; 10051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10064e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust this_len = min_t(unsigned int, len, subbuf->head[0].iov_len); 10074e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust memcpy(obj, subbuf->head[0].iov_base, this_len); 10081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len -= this_len; 10091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds obj += this_len; 10104e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust this_len = min_t(unsigned int, len, subbuf->page_len); 10111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (this_len) 10124e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust _copy_from_pages(obj, subbuf->pages, subbuf->page_base, this_len); 10131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len -= this_len; 10141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds obj += this_len; 10154e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust this_len = min_t(unsigned int, len, subbuf->tail[0].iov_len); 10164e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust memcpy(obj, subbuf->tail[0].iov_base, this_len); 10171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 10181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1019bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher/* obj is assumed to point to allocated memory of size at least len: */ 10204e3e43ad14c574281034a27420abf1993694ac11Trond Myklebustint read_bytes_from_xdr_buf(struct xdr_buf *buf, unsigned int base, void *obj, unsigned int len) 1021bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher{ 1022bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher struct xdr_buf subbuf; 1023bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher int status; 1024bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1025bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher status = xdr_buf_subsegment(buf, &subbuf, base, len); 10264e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust if (status != 0) 10274e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust return status; 10284e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust __read_bytes_from_xdr_buf(&subbuf, obj, len); 10294e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust return 0; 10304e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust} 1031468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(read_bytes_from_xdr_buf); 10324e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust 10334e3e43ad14c574281034a27420abf1993694ac11Trond Myklebuststatic void __write_bytes_to_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len) 10344e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust{ 10354e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust unsigned int this_len; 10364e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust 10374e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust this_len = min_t(unsigned int, len, subbuf->head[0].iov_len); 10384e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust memcpy(subbuf->head[0].iov_base, obj, this_len); 1039bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher len -= this_len; 1040bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher obj += this_len; 10414e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust this_len = min_t(unsigned int, len, subbuf->page_len); 1042bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (this_len) 10434e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust _copy_to_pages(subbuf->pages, subbuf->page_base, obj, this_len); 1044bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher len -= this_len; 1045bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher obj += this_len; 10464e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust this_len = min_t(unsigned int, len, subbuf->tail[0].iov_len); 10474e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust memcpy(subbuf->tail[0].iov_base, obj, this_len); 10484e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust} 10494e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust 10504e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust/* obj is assumed to point to allocated memory of size at least len: */ 10514e3e43ad14c574281034a27420abf1993694ac11Trond Myklebustint write_bytes_to_xdr_buf(struct xdr_buf *buf, unsigned int base, void *obj, unsigned int len) 10524e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust{ 10534e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust struct xdr_buf subbuf; 10544e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust int status; 10554e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust 10564e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust status = xdr_buf_subsegment(buf, &subbuf, base, len); 10574e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust if (status != 0) 10584e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust return status; 10594e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust __write_bytes_to_xdr_buf(&subbuf, obj, len); 10604e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust return 0; 1061bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher} 1062c43abaedaff92a7bcbfe04b593164bb5faba3078Kevin CoffmanEXPORT_SYMBOL_GPL(write_bytes_to_xdr_buf); 1063bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1064bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherint 10651e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebustxdr_decode_word(struct xdr_buf *buf, unsigned int base, u32 *obj) 10661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1067d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan __be32 raw; 10681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int status; 10691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); 10711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (status) 10721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return status; 107398866b5abe1513cdacc011874ca045d40002eccdBenny Halevy *obj = be32_to_cpu(raw); 10741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 10751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1076468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_decode_word); 10771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1078bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherint 10791e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebustxdr_encode_word(struct xdr_buf *buf, unsigned int base, u32 obj) 1080bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher{ 10819f162d2a810b4db48f7b8d7e734d0932c81ec2a1Benny Halevy __be32 raw = cpu_to_be32(obj); 1082bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1083bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return write_bytes_to_xdr_buf(buf, base, &raw, sizeof(obj)); 1084bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher} 1085468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_encode_word); 1086bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 10871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* If the netobj starting offset bytes from the start of xdr_buf is contained 10881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * entirely in the head or the tail, set object to point to it; otherwise 10891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * try to find space for it at the end of the tail, copy it there, and 10901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * set obj to point to it. */ 1091bee57c99c322d64407b80c8171958b4384902da4Trond Myklebustint xdr_buf_read_netobj(struct xdr_buf *buf, struct xdr_netobj *obj, unsigned int offset) 10921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1093bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust struct xdr_buf subbuf; 10941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1095bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (xdr_decode_word(buf, offset, &obj->len)) 1096bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust return -EFAULT; 1097bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust if (xdr_buf_subsegment(buf, &subbuf, offset + 4, obj->len)) 1098bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust return -EFAULT; 1099bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust 1100bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust /* Is the obj contained entirely in the head? */ 1101bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust obj->data = subbuf.head[0].iov_base; 1102bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust if (subbuf.head[0].iov_len == obj->len) 1103bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust return 0; 1104bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust /* ..or is the obj contained entirely in the tail? */ 1105bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust obj->data = subbuf.tail[0].iov_base; 1106bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust if (subbuf.tail[0].iov_len == obj->len) 1107bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust return 0; 1108bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust 1109bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust /* use end of tail as storage for obj: 1110bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust * (We don't copy to the beginning because then we'd have 1111bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust * to worry about doing a potentially overlapping copy. 1112bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust * This assumes the object is at most half the length of the 1113bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust * tail.) */ 1114bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust if (obj->len > buf->buflen - buf->len) 1115bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust return -ENOMEM; 1116bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust if (buf->tail[0].iov_len != 0) 1117bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust obj->data = buf->tail[0].iov_base + buf->tail[0].iov_len; 1118bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust else 1119bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust obj->data = buf->head[0].iov_base + buf->head[0].iov_len; 1120bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust __read_bytes_from_xdr_buf(&subbuf, obj->data, obj->len); 11211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 11221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1123468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_buf_read_netobj); 1124bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1125bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher/* Returns 0 on success, or else a negative error code. */ 1126bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherstatic int 1127bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherxdr_xcode_array2(struct xdr_buf *buf, unsigned int base, 1128bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher struct xdr_array2_desc *desc, int encode) 1129bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher{ 1130bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher char *elem = NULL, *c; 1131bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher unsigned int copied = 0, todo, avail_here; 1132bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher struct page **ppages = NULL; 1133bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher int err; 1134bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1135bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (encode) { 1136bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (xdr_encode_word(buf, base, desc->array_len) != 0) 1137bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return -EINVAL; 1138bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } else { 1139bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (xdr_decode_word(buf, base, &desc->array_len) != 0 || 114058fcb8df0bf663bb6b8f46cd3010bfe8d13d97cfTrond Myklebust desc->array_len > desc->array_maxlen || 1141bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher (unsigned long) base + 4 + desc->array_len * 1142bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher desc->elem_size > buf->len) 1143bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return -EINVAL; 1144bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1145bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base += 4; 1146bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1147bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!desc->xcode) 1148bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return 0; 1149bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1150bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher todo = desc->array_len * desc->elem_size; 1151bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1152bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher /* process head */ 1153bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (todo && base < buf->head->iov_len) { 1154bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c = buf->head->iov_base + base; 1155bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_here = min_t(unsigned int, todo, 1156bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher buf->head->iov_len - base); 1157bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher todo -= avail_here; 1158bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1159bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher while (avail_here >= desc->elem_size) { 1160bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, c); 1161bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 1162bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1163bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c += desc->elem_size; 1164bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_here -= desc->elem_size; 1165bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1166bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (avail_here) { 1167bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!elem) { 1168bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher elem = kmalloc(desc->elem_size, GFP_KERNEL); 1169bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = -ENOMEM; 1170bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!elem) 1171bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1172bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1173bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (encode) { 1174bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, elem); 1175bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 1176bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1177bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(c, elem, avail_here); 1178bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } else 1179bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(elem, c, avail_here); 1180bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied = avail_here; 1181bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1182bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base = buf->head->iov_len; /* align to start of pages */ 1183bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1184bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1185bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher /* process pages array */ 1186bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base -= buf->head->iov_len; 1187bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (todo && base < buf->page_len) { 1188bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher unsigned int avail_page; 1189bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1190bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_here = min(todo, buf->page_len - base); 1191bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher todo -= avail_here; 1192bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1193bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base += buf->page_base; 1194bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher ppages = buf->pages + (base >> PAGE_CACHE_SHIFT); 1195bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base &= ~PAGE_CACHE_MASK; 1196bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_page = min_t(unsigned int, PAGE_CACHE_SIZE - base, 1197bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_here); 1198bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c = kmap(*ppages) + base; 1199bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1200bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher while (avail_here) { 1201bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_here -= avail_page; 1202bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (copied || avail_page < desc->elem_size) { 1203bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher unsigned int l = min(avail_page, 1204bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher desc->elem_size - copied); 1205bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!elem) { 1206bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher elem = kmalloc(desc->elem_size, 1207bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher GFP_KERNEL); 1208bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = -ENOMEM; 1209bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!elem) 1210bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1211bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1212bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (encode) { 1213bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!copied) { 1214bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, elem); 1215bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 1216bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1217bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1218bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(c, elem + copied, l); 1219bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied += l; 1220bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (copied == desc->elem_size) 1221bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied = 0; 1222bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } else { 1223bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(elem + copied, c, l); 1224bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied += l; 1225bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (copied == desc->elem_size) { 1226bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, elem); 1227bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 1228bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1229bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied = 0; 1230bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1231bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1232bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_page -= l; 1233bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c += l; 1234bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1235bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher while (avail_page >= desc->elem_size) { 1236bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, c); 1237bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 1238bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1239bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c += desc->elem_size; 1240bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_page -= desc->elem_size; 1241bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1242bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (avail_page) { 1243bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher unsigned int l = min(avail_page, 1244bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher desc->elem_size - copied); 1245bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!elem) { 1246bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher elem = kmalloc(desc->elem_size, 1247bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher GFP_KERNEL); 1248bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = -ENOMEM; 1249bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!elem) 1250bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1251bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1252bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (encode) { 1253bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!copied) { 1254bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, elem); 1255bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 1256bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1257bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1258bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(c, elem + copied, l); 1259bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied += l; 1260bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (copied == desc->elem_size) 1261bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied = 0; 1262bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } else { 1263bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(elem + copied, c, l); 1264bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied += l; 1265bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (copied == desc->elem_size) { 1266bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, elem); 1267bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 1268bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1269bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied = 0; 1270bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1271bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1272bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1273bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (avail_here) { 1274bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher kunmap(*ppages); 1275bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher ppages++; 1276bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c = kmap(*ppages); 1277bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1278bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1279bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_page = min(avail_here, 1280bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher (unsigned int) PAGE_CACHE_SIZE); 1281bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1282bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base = buf->page_len; /* align to start of tail */ 1283bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1284bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1285bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher /* process tail */ 1286bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base -= buf->page_len; 1287bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (todo) { 1288bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c = buf->tail->iov_base + base; 1289bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (copied) { 1290bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher unsigned int l = desc->elem_size - copied; 1291bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1292bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (encode) 1293bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(c, elem + copied, l); 1294bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher else { 1295bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(elem + copied, c, l); 1296bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, elem); 1297bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 1298bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1299bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1300bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher todo -= l; 1301bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c += l; 1302bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1303bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher while (todo) { 1304bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, c); 1305bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 1306bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1307bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c += desc->elem_size; 1308bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher todo -= desc->elem_size; 1309bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1310bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1311bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = 0; 1312bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1313bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherout: 1314a51482bde22f99c63fbbb57d5d46cc666384e379Jesper Juhl kfree(elem); 1315bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (ppages) 1316bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher kunmap(*ppages); 1317bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return err; 1318bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher} 1319bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1320bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherint 1321bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherxdr_decode_array2(struct xdr_buf *buf, unsigned int base, 1322bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher struct xdr_array2_desc *desc) 1323bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher{ 1324bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (base >= buf->len) 1325bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return -EINVAL; 1326bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1327bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return xdr_xcode_array2(buf, base, desc, 0); 1328bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher} 1329468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_decode_array2); 1330bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1331bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherint 1332bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherxdr_encode_array2(struct xdr_buf *buf, unsigned int base, 1333bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher struct xdr_array2_desc *desc) 1334bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher{ 1335bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if ((unsigned long) base + 4 + desc->array_len * desc->elem_size > 1336bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher buf->head->iov_len + buf->page_len + buf->tail->iov_len) 1337bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return -EINVAL; 1338bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1339bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return xdr_xcode_array2(buf, base, desc, 1); 1340bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher} 1341468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_encode_array2); 134237a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia 134337a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaiaint 134437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaiaxdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, 1345cca5172a7ec10dfdb0b787cd8e9d5b0b8f179793YOSHIFUJI Hideaki int (*actor)(struct scatterlist *, void *), void *data) 134637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia{ 134737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia int i, ret = 0; 134895c961747284a6b83a5e2d81240e214b0fa3464dEric Dumazet unsigned int page_len, thislen, page_offset; 134937a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia struct scatterlist sg[1]; 135037a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia 135168e3f5dd4db62619fdbe520d36c9ebf62e672256Herbert Xu sg_init_table(sg, 1); 135268e3f5dd4db62619fdbe520d36c9ebf62e672256Herbert Xu 135337a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (offset >= buf->head[0].iov_len) { 135437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia offset -= buf->head[0].iov_len; 135537a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia } else { 135637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = buf->head[0].iov_len - offset; 135737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (thislen > len) 135837a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = len; 135937a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia sg_set_buf(sg, buf->head[0].iov_base + offset, thislen); 136037a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia ret = actor(sg, data); 136137a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (ret) 136237a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia goto out; 136337a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia offset = 0; 136437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia len -= thislen; 136537a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia } 136637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (len == 0) 136737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia goto out; 136837a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia 136937a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (offset >= buf->page_len) { 137037a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia offset -= buf->page_len; 137137a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia } else { 137237a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia page_len = buf->page_len - offset; 137337a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (page_len > len) 137437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia page_len = len; 137537a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia len -= page_len; 137637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia page_offset = (offset + buf->page_base) & (PAGE_CACHE_SIZE - 1); 137737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia i = (offset + buf->page_base) >> PAGE_CACHE_SHIFT; 137837a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = PAGE_CACHE_SIZE - page_offset; 137937a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia do { 138037a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (thislen > page_len) 138137a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = page_len; 1382642f149031d70415d9318b919d50b71e4724adbdJens Axboe sg_set_page(sg, buf->pages[i], thislen, page_offset); 138337a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia ret = actor(sg, data); 138437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (ret) 138537a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia goto out; 138637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia page_len -= thislen; 138737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia i++; 138837a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia page_offset = 0; 138937a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = PAGE_CACHE_SIZE; 139037a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia } while (page_len != 0); 139137a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia offset = 0; 139237a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia } 139337a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (len == 0) 139437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia goto out; 139537a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (offset < buf->tail[0].iov_len) { 139637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = buf->tail[0].iov_len - offset; 139737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (thislen > len) 139837a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = len; 139937a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia sg_set_buf(sg, buf->tail[0].iov_base + offset, thislen); 140037a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia ret = actor(sg, data); 140137a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia len -= thislen; 140237a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia } 140337a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (len != 0) 140437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia ret = -EINVAL; 140537a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaiaout: 140637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia return ret; 140737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia} 1408468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_process_buf); 140937a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia 1410