xdr.c revision 4c190e2f913f038c9c91ee63b59cd037260ba353
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); 210b85417860172ff693dc115d7999805fc240cec1cCong Wang vfrom = kmap_atomic(*pgfrom); 2111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memmove(vto + pgto_base, vfrom + pgfrom_base, copy); 212bce3481c91801665e17f8daf59ede946129f3d3fTrond Myklebust flush_dcache_page(*pgto); 213b85417860172ff693dc115d7999805fc240cec1cCong Wang kunmap_atomic(vfrom); 214b85417860172ff693dc115d7999805fc240cec1cCong Wang kunmap_atomic(vto); 2151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } while ((len -= copy) != 0); 2171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2192c53040f018b6c36a46eec75b9b937aaa5f78e6dBen Hutchings/** 2201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * _copy_to_pages 2211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pages: array of pages 2221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pgbase: page vector address of destination 2231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @p: pointer to source data 2241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: length 2251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copies data from an arbitrary memory location into an array of pages 2271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The copy is assumed to be non-overlapping. 2281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void 2301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds_copy_to_pages(struct page **pages, size_t pgbase, const char *p, size_t len) 2311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct page **pgto; 2331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *vto; 2341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t copy; 2351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgto = pages + (pgbase >> PAGE_CACHE_SHIFT); 2371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgbase &= ~PAGE_CACHE_MASK; 2381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 239daeba89d43af0fa469d38a4ccdc32fff8ca17c2eTrond Myklebust for (;;) { 2401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = PAGE_CACHE_SIZE - pgbase; 2411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy > len) 2421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = len; 2431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 244b85417860172ff693dc115d7999805fc240cec1cCong Wang vto = kmap_atomic(*pgto); 2451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memcpy(vto + pgbase, p, copy); 246b85417860172ff693dc115d7999805fc240cec1cCong Wang kunmap_atomic(vto); 2471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 248daeba89d43af0fa469d38a4ccdc32fff8ca17c2eTrond Myklebust len -= copy; 249daeba89d43af0fa469d38a4ccdc32fff8ca17c2eTrond Myklebust if (len == 0) 250daeba89d43af0fa469d38a4ccdc32fff8ca17c2eTrond Myklebust break; 251daeba89d43af0fa469d38a4ccdc32fff8ca17c2eTrond Myklebust 2521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgbase += copy; 2531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (pgbase == PAGE_CACHE_SIZE) { 2541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds flush_dcache_page(*pgto); 2551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgbase = 0; 2561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgto++; 2571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds p += copy; 259daeba89d43af0fa469d38a4ccdc32fff8ca17c2eTrond Myklebust } 2601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds flush_dcache_page(*pgto); 2611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2632c53040f018b6c36a46eec75b9b937aaa5f78e6dBen Hutchings/** 2641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * _copy_from_pages 2651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @p: pointer to destination 2661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pages: array of pages 2671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pgbase: offset of source data 2681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: length 2691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copies data into an arbitrary memory location from an array of pages 2711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The copy is assumed to be non-overlapping. 2721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 273bf118a342f10dafe44b14451a1392c3254629a1fAndy Adamsonvoid 2741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds_copy_from_pages(char *p, struct page **pages, size_t pgbase, size_t len) 2751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct page **pgfrom; 2771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *vfrom; 2781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t copy; 2791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgfrom = pages + (pgbase >> PAGE_CACHE_SHIFT); 2811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgbase &= ~PAGE_CACHE_MASK; 2821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds do { 2841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = PAGE_CACHE_SIZE - pgbase; 2851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy > len) 2861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = len; 2871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 288b85417860172ff693dc115d7999805fc240cec1cCong Wang vfrom = kmap_atomic(*pgfrom); 2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memcpy(p, vfrom + pgbase, copy); 290b85417860172ff693dc115d7999805fc240cec1cCong Wang kunmap_atomic(vfrom); 2911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgbase += copy; 2931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (pgbase == PAGE_CACHE_SIZE) { 2941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgbase = 0; 2951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pgfrom++; 2961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds p += copy; 2981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } while ((len -= copy) != 0); 3001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 301bf118a342f10dafe44b14451a1392c3254629a1fAndy AdamsonEXPORT_SYMBOL_GPL(_copy_from_pages); 3021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3032c53040f018b6c36a46eec75b9b937aaa5f78e6dBen Hutchings/** 3041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_shrink_bufhead 3051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @buf: xdr_buf 3061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: bytes to remove from buf->head[0] 3071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 308cca5172a7ec10dfdb0b787cd8e9d5b0b8f179793YOSHIFUJI Hideaki * Shrinks XDR buffer's header kvec buf->head[0] by 3091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 'len' bytes. The extra data is not lost, but is instead 3101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * moved into the inlined pages and/or the tail. 3111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void 3131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsxdr_shrink_bufhead(struct xdr_buf *buf, size_t len) 3141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *head, *tail; 3161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t copy, offs; 3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int pglen = buf->page_len; 3181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tail = buf->tail; 3201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds head = buf->head; 32118e624ad0374f3b1092530f978301611f88e45b3Weston Andros Adamson 32218e624ad0374f3b1092530f978301611f88e45b3Weston Andros Adamson WARN_ON_ONCE(len > head->iov_len); 32318e624ad0374f3b1092530f978301611f88e45b3Weston Andros Adamson if (len > head->iov_len) 32418e624ad0374f3b1092530f978301611f88e45b3Weston Andros Adamson len = head->iov_len; 3251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Shift the tail first */ 3271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (tail->iov_len != 0) { 3281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (tail->iov_len > len) { 3291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = tail->iov_len - len; 3301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memmove((char *)tail->iov_base + len, 3311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tail->iov_base, copy); 3321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Copy from the inlined pages into the tail */ 3341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = len; 3351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy > pglen) 3361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = pglen; 3371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds offs = len - copy; 3381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (offs >= tail->iov_len) 3391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = 0; 3401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else if (copy > tail->iov_len - offs) 3411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = tail->iov_len - offs; 3421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy != 0) 3431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds _copy_from_pages((char *)tail->iov_base + offs, 3441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->pages, 3451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_base + pglen + offs - len, 3461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy); 3471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Do we also need to copy data from the head into the tail ? */ 3481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (len > pglen) { 3491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds offs = copy = len - pglen; 3501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy > tail->iov_len) 3511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = tail->iov_len; 3521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memcpy(tail->iov_base, 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (char *)head->iov_base + 3541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds head->iov_len - offs, 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy); 3561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Now handle pages */ 3591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (pglen != 0) { 3601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (pglen > len) 3611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds _shift_data_right_pages(buf->pages, 3621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_base + len, 3631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_base, 3641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pglen - len); 3651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = len; 3661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (len > pglen) 3671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = pglen; 3681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds _copy_to_pages(buf->pages, buf->page_base, 3691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (char *)head->iov_base + head->iov_len - len, 3701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy); 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds head->iov_len -= len; 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->buflen -= len; 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Have we truncated the message? */ 3751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (buf->len > buf->buflen) 3761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->len = buf->buflen; 3771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3792c53040f018b6c36a46eec75b9b937aaa5f78e6dBen Hutchings/** 3801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_shrink_pagelen 3811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @buf: xdr_buf 3821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: bytes to remove from buf->pages 3831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 384cca5172a7ec10dfdb0b787cd8e9d5b0b8f179793YOSHIFUJI Hideaki * Shrinks XDR buffer's page array buf->pages by 3851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 'len' bytes. The extra data is not lost, but is instead 3861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * moved into the tail. 3871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void 3891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsxdr_shrink_pagelen(struct xdr_buf *buf, size_t len) 3901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *tail; 3921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t copy; 3931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int pglen = buf->page_len; 394cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust unsigned int tailbuf_len; 3951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tail = buf->tail; 3971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BUG_ON (len > pglen); 3981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 399cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust tailbuf_len = buf->buflen - buf->head->iov_len - buf->page_len; 400cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust 4011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Shift the tail first */ 402cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust if (tailbuf_len != 0) { 403cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust unsigned int free_space = tailbuf_len - tail->iov_len; 404cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust 405cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust if (len < free_space) 406cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust free_space = len; 407cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust tail->iov_len += free_space; 408cf187c2d7ec763cdd459fe43933a5cc4f5f48e1bTrond Myklebust 40942d6d8ab51ca04afcb8a64759076da624cdb71e8Benny Halevy copy = len; 4101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (tail->iov_len > len) { 4110fe62a35903e11fb41b492bd5b0e8e4c751d5c94Benny Halevy char *p = (char *)tail->iov_base + len; 4122e29ebb8119e6037133921fac09cc5f9d625b511Benny Halevy memmove(p, tail->iov_base, tail->iov_len - len); 41342d6d8ab51ca04afcb8a64759076da624cdb71e8Benny Halevy } else 4141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy = tail->iov_len; 41542d6d8ab51ca04afcb8a64759076da624cdb71e8Benny Halevy /* Copy from the inlined pages into the tail */ 4161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds _copy_from_pages((char *)tail->iov_base, 4171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->pages, buf->page_base + pglen - len, 4181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copy); 4191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_len -= len; 4211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->buflen -= len; 4221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Have we truncated the message? */ 4231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (buf->len > buf->buflen) 4241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->len = buf->buflen; 4251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid 4281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsxdr_shift_buf(struct xdr_buf *buf, size_t len) 4291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr_shrink_bufhead(buf, len); 4311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 432468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_shift_buf); 4331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 4354517d526c8aa31b5c14165ef180cc19518ff0a35Trond Myklebust * xdr_stream_pos - Return the current offset from the start of the xdr_stream 4364517d526c8aa31b5c14165ef180cc19518ff0a35Trond Myklebust * @xdr: pointer to struct xdr_stream 4374517d526c8aa31b5c14165ef180cc19518ff0a35Trond Myklebust */ 4384517d526c8aa31b5c14165ef180cc19518ff0a35Trond Myklebustunsigned int xdr_stream_pos(const struct xdr_stream *xdr) 4394517d526c8aa31b5c14165ef180cc19518ff0a35Trond Myklebust{ 4404517d526c8aa31b5c14165ef180cc19518ff0a35Trond Myklebust return (unsigned int)(XDR_QUADLEN(xdr->buf->len) - xdr->nwords) << 2; 4414517d526c8aa31b5c14165ef180cc19518ff0a35Trond Myklebust} 4424517d526c8aa31b5c14165ef180cc19518ff0a35Trond MyklebustEXPORT_SYMBOL_GPL(xdr_stream_pos); 4434517d526c8aa31b5c14165ef180cc19518ff0a35Trond Myklebust 4444517d526c8aa31b5c14165ef180cc19518ff0a35Trond Myklebust/** 4451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_init_encode - Initialize a struct xdr_stream for sending data. 4461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @xdr: pointer to xdr_stream struct 4471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @buf: pointer to XDR buffer in which to encode data 4481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @p: current pointer inside XDR buffer 4491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 4501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Note: at the moment the RPC client only passes the length of our 4511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * scratch buffer in the xdr_buf's header kvec. Previously this 4521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * meant we needed to call xdr_adjust_iovec() after encoding the 4531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * data. With the new scheme, the xdr_stream manages the details 4541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * of the buffer length, and takes care of adjusting the kvec 4551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * length for us. 4561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 457d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyanvoid xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p) 4581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *iov = buf->head; 460334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust int scratch_len = buf->buflen - buf->page_len - buf->tail[0].iov_len; 4611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 462334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust BUG_ON(scratch_len < 0); 4631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->buf = buf; 4641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->iov = iov; 465d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan xdr->p = (__be32 *)((char *)iov->iov_base + iov->iov_len); 466d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan xdr->end = (__be32 *)((char *)iov->iov_base + scratch_len); 467334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust BUG_ON(iov->iov_len > scratch_len); 468334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust 469334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust if (p != xdr->p && p != NULL) { 470334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust size_t len; 471334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust 472334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust BUG_ON(p < xdr->p || p > xdr->end); 473334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust len = (char *)p - (char *)xdr->p; 474334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust xdr->p = p; 475334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust buf->len += len; 476334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust iov->iov_len += len; 477334ccfd545bba9690515f2c5c167d5adb161989bTrond Myklebust } 4781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 479468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_init_encode); 4801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 4821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_reserve_space - Reserve buffer space for sending 4831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @xdr: pointer to xdr_stream 4841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @nbytes: number of bytes to reserve 4851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 4861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Checks that we have enough buffer space to encode 'nbytes' more 4871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * bytes of data. If so, update the total xdr_buf length, and 4881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * adjust the length of the current kvec. 4891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 490d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan__be32 * xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes) 4911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 492d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan __be32 *p = xdr->p; 493d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan __be32 *q; 4941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* align nbytes on the next 32-bit boundary */ 4961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds nbytes += 3; 4971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds nbytes &= ~3; 4981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds q = p + (nbytes >> 2); 4991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (unlikely(q > xdr->end || q < p)) 5001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 5011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->p = q; 5021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->iov->iov_len += nbytes; 5031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->buf->len += nbytes; 5041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return p; 5051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 506468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_reserve_space); 5071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 5091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_write_pages - Insert a list of pages into an XDR buffer for sending 5101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @xdr: pointer to xdr_stream 5111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @pages: list of pages 5121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @base: offset of first byte 5131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: length of data in bytes 5141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 5151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 5161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid xdr_write_pages(struct xdr_stream *xdr, struct page **pages, unsigned int base, 5171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int len) 5181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct xdr_buf *buf = xdr->buf; 5201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *iov = buf->tail; 5211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->pages = pages; 5221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_base = base; 5231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_len = len; 5241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iov->iov_base = (char *)xdr->p; 5261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iov->iov_len = 0; 5271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->iov = iov; 5281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (len & 3) { 5301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int pad = 4 - (len & 3); 5311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BUG_ON(xdr->p >= xdr->end); 5331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iov->iov_base = (char *)xdr->p + (len & 3); 5341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iov->iov_len += pad; 5351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len += pad; 5361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *xdr->p++ = 0; 5371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->buflen += len; 5391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->len += len; 5401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 541468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_write_pages); 5421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5436650239a4b01077e80d5a4468562756d77afaa59Trond Myklebuststatic void xdr_set_iov(struct xdr_stream *xdr, struct kvec *iov, 5441537693ceaa8d6484f1ce631bec85658bfa9816cTrond Myklebust unsigned int len) 5456650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust{ 5466650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (len > iov->iov_len) 5476650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust len = iov->iov_len; 5481537693ceaa8d6484f1ce631bec85658bfa9816cTrond Myklebust xdr->p = (__be32*)iov->iov_base; 5496650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->end = (__be32*)(iov->iov_base + len); 5506650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->iov = iov; 5516650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->page_ptr = NULL; 5526650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust} 5536650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 5546650239a4b01077e80d5a4468562756d77afaa59Trond Myklebuststatic int xdr_set_page_base(struct xdr_stream *xdr, 5556650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust unsigned int base, unsigned int len) 5566650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust{ 5576650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust unsigned int pgnr; 5586650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust unsigned int maxlen; 5596650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust unsigned int pgoff; 5606650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust unsigned int pgend; 5616650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust void *kaddr; 5626650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 5636650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust maxlen = xdr->buf->page_len; 5646650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (base >= maxlen) 5656650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return -EINVAL; 5666650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust maxlen -= base; 5676650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (len > maxlen) 5686650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust len = maxlen; 5696650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 5706650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust base += xdr->buf->page_base; 5716650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 5726650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust pgnr = base >> PAGE_SHIFT; 5736650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->page_ptr = &xdr->buf->pages[pgnr]; 5746650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust kaddr = page_address(*xdr->page_ptr); 5756650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 5766650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust pgoff = base & ~PAGE_MASK; 5776650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->p = (__be32*)(kaddr + pgoff); 5786650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 5796650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust pgend = pgoff + len; 5806650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (pgend > PAGE_SIZE) 5816650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust pgend = PAGE_SIZE; 5826650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->end = (__be32*)(kaddr + pgend); 5836650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->iov = NULL; 5846650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return 0; 5856650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust} 5866650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 5876650239a4b01077e80d5a4468562756d77afaa59Trond Myklebuststatic void xdr_set_next_page(struct xdr_stream *xdr) 5886650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust{ 5896650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust unsigned int newbase; 5906650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 5916650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust newbase = (1 + xdr->page_ptr - xdr->buf->pages) << PAGE_SHIFT; 5926650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust newbase -= xdr->buf->page_base; 5936650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 5946650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (xdr_set_page_base(xdr, newbase, PAGE_SIZE) < 0) 5951537693ceaa8d6484f1ce631bec85658bfa9816cTrond Myklebust xdr_set_iov(xdr, xdr->buf->tail, xdr->buf->len); 5966650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust} 5976650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 5986650239a4b01077e80d5a4468562756d77afaa59Trond Myklebuststatic bool xdr_set_next_buffer(struct xdr_stream *xdr) 5996650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust{ 6006650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (xdr->page_ptr != NULL) 6016650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr_set_next_page(xdr); 6026650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust else if (xdr->iov == xdr->buf->head) { 6036650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (xdr_set_page_base(xdr, 0, PAGE_SIZE) < 0) 6041537693ceaa8d6484f1ce631bec85658bfa9816cTrond Myklebust xdr_set_iov(xdr, xdr->buf->tail, xdr->buf->len); 6056650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust } 6066650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return xdr->p != xdr->end; 6076650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust} 6086650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 6091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 6101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_init_decode - Initialize an xdr_stream for decoding data. 6111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @xdr: pointer to xdr_stream struct 6121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @buf: pointer to XDR buffer from which to decode data 6131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @p: current pointer inside XDR buffer 6141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 615d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyanvoid xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p) 6161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 6171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->buf = buf; 6186650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->scratch.iov_base = NULL; 6196650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->scratch.iov_len = 0; 620bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust xdr->nwords = XDR_QUADLEN(buf->len); 6216650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (buf->head[0].iov_len != 0) 6221537693ceaa8d6484f1ce631bec85658bfa9816cTrond Myklebust xdr_set_iov(xdr, buf->head, buf->len); 6236650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust else if (buf->page_len != 0) 6246650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr_set_page_base(xdr, 0, buf->len); 625bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust if (p != NULL && p > xdr->p && xdr->end >= p) { 626bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust xdr->nwords -= p - xdr->p; 6271537693ceaa8d6484f1ce631bec85658bfa9816cTrond Myklebust xdr->p = p; 628bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust } 6291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 630468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_init_decode); 6311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 632f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy/** 633f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy * xdr_init_decode - Initialize an xdr_stream for decoding data. 634f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy * @xdr: pointer to xdr_stream struct 635f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy * @buf: pointer to XDR buffer from which to decode data 636f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy * @pages: list of pages to decode into 637f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy * @len: length in bytes of buffer in pages 638f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy */ 639f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevyvoid xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf, 640f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy struct page **pages, unsigned int len) 641f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy{ 642f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy memset(buf, 0, sizeof(*buf)); 643f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy buf->pages = pages; 644f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy buf->page_len = len; 645f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy buf->buflen = len; 646f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy buf->len = len; 647f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy xdr_init_decode(xdr, buf, NULL); 648f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy} 649f7da7a129d57bfe0f74573dc03531c63e1360faeBenny HalevyEXPORT_SYMBOL_GPL(xdr_init_decode_pages); 650f7da7a129d57bfe0f74573dc03531c63e1360faeBenny Halevy 6516650239a4b01077e80d5a4468562756d77afaa59Trond Myklebuststatic __be32 * __xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes) 652ba8e452a4fe64a51b74d43761e14d99f0666cc45Trond Myklebust{ 653bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust unsigned int nwords = XDR_QUADLEN(nbytes); 654ba8e452a4fe64a51b74d43761e14d99f0666cc45Trond Myklebust __be32 *p = xdr->p; 655bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust __be32 *q = p + nwords; 656ba8e452a4fe64a51b74d43761e14d99f0666cc45Trond Myklebust 657bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust if (unlikely(nwords > xdr->nwords || q > xdr->end || q < p)) 658ba8e452a4fe64a51b74d43761e14d99f0666cc45Trond Myklebust return NULL; 6596650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->p = q; 660bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust xdr->nwords -= nwords; 661ba8e452a4fe64a51b74d43761e14d99f0666cc45Trond Myklebust return p; 662ba8e452a4fe64a51b74d43761e14d99f0666cc45Trond Myklebust} 663ba8e452a4fe64a51b74d43761e14d99f0666cc45Trond Myklebust 664ba8e452a4fe64a51b74d43761e14d99f0666cc45Trond Myklebust/** 6656650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * xdr_set_scratch_buffer - Attach a scratch buffer for decoding data. 6666650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * @xdr: pointer to xdr_stream struct 6676650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * @buf: pointer to an empty buffer 6686650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * @buflen: size of 'buf' 6696650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * 6706650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * The scratch buffer is used when decoding from an array of pages. 6716650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * If an xdr_inline_decode() call spans across page boundaries, then 6726650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * we copy the data into the scratch buffer in order to allow linear 6736650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * access. 6746650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust */ 6756650239a4b01077e80d5a4468562756d77afaa59Trond Myklebustvoid xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen) 6766650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust{ 6776650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->scratch.iov_base = buf; 6786650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust xdr->scratch.iov_len = buflen; 6796650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust} 6806650239a4b01077e80d5a4468562756d77afaa59Trond MyklebustEXPORT_SYMBOL_GPL(xdr_set_scratch_buffer); 6816650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 6826650239a4b01077e80d5a4468562756d77afaa59Trond Myklebuststatic __be32 *xdr_copy_to_scratch(struct xdr_stream *xdr, size_t nbytes) 6836650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust{ 6846650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust __be32 *p; 6856650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust void *cpdest = xdr->scratch.iov_base; 6866650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust size_t cplen = (char *)xdr->end - (char *)xdr->p; 6876650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 6886650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (nbytes > xdr->scratch.iov_len) 6896650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return NULL; 6906650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust memcpy(cpdest, xdr->p, cplen); 6916650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust cpdest += cplen; 6926650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust nbytes -= cplen; 6936650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (!xdr_set_next_buffer(xdr)) 6946650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return NULL; 6956650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust p = __xdr_inline_decode(xdr, nbytes); 6966650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (p == NULL) 6976650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return NULL; 6986650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust memcpy(cpdest, p, nbytes); 6996650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return xdr->scratch.iov_base; 7006650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust} 7016650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust 7026650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust/** 7036650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust * xdr_inline_decode - Retrieve XDR data to decode 7041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @xdr: pointer to xdr_stream struct 7051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @nbytes: number of bytes of data to decode 7061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 7071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Check if the input buffer is long enough to enable us to decode 7081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 'nbytes' more bytes of data starting at the current position. 7091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * If so return the current pointer, then update the current 7101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * pointer position. 7111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 712d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan__be32 * xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes) 7131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7146650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust __be32 *p; 7151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7166650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (nbytes == 0) 7176650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return xdr->p; 7186650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (xdr->p == xdr->end && !xdr_set_next_buffer(xdr)) 7191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 7206650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust p = __xdr_inline_decode(xdr, nbytes); 7216650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust if (p != NULL) 7226650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return p; 7236650239a4b01077e80d5a4468562756d77afaa59Trond Myklebust return xdr_copy_to_scratch(xdr, nbytes); 7241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 725468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_inline_decode); 7261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7273994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebuststatic unsigned int xdr_align_pages(struct xdr_stream *xdr, unsigned int len) 7281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct xdr_buf *buf = xdr->buf; 7301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *iov; 731bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust unsigned int nwords = XDR_QUADLEN(len); 732b760b3131d962dd35925fb65956afe621fa65ec4Trond Myklebust unsigned int cur = xdr_stream_pos(xdr); 7331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 734bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust if (xdr->nwords == 0) 735c337d3655ce85e12c7c476cb81406521926cacd2Trond Myklebust return 0; 7361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Realign pages to current pointer position */ 7371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iov = buf->head; 738a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust if (iov->iov_len > cur) { 739b760b3131d962dd35925fb65956afe621fa65ec4Trond Myklebust xdr_shrink_bufhead(buf, iov->iov_len - cur); 740a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust xdr->nwords = XDR_QUADLEN(buf->len - cur); 741a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust } 7421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 743a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust if (nwords > xdr->nwords) { 744a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust nwords = xdr->nwords; 745a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust len = nwords << 2; 746a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust } 747a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust if (buf->page_len <= len) 7488a9a8b8332b92b13316cf49685b5dc5257cfe115Trond Myklebust len = buf->page_len; 749a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust else if (nwords < xdr->nwords) { 750a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust /* Truncate page data and move it into the tail */ 751a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust xdr_shrink_pagelen(buf, buf->page_len - len); 752a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust xdr->nwords = XDR_QUADLEN(buf->len - cur); 753a11a2bf4de5679fa0b63474c7d39bea2dac7d061Trond Myklebust } 7543994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust return len; 7553994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust} 756bd00f84bc57f42df32c728e86329a5c30f221657Trond Myklebust 7571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 7581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * xdr_read_pages - Ensure page-based XDR data to decode is aligned at current pointer position 7591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @xdr: pointer to xdr_stream struct 7601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @len: number of bytes of page data 7611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 7621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Moves data beyond the current pointer position from the XDR head[] buffer 7631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * into the page list. Any data that lies beyond current position + "len" 7648b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * bytes is moved into the XDR tail[]. 7653994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust * 7663994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust * Returns the number of XDR encoded bytes now contained in the pages 7671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 7683994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebustunsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len) 7691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct xdr_buf *buf = xdr->buf; 7711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct kvec *iov; 7723994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust unsigned int nwords; 7731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int end; 7743994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust unsigned int padding; 7751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7763994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust len = xdr_align_pages(xdr, len); 7773994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust if (len == 0) 7783994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust return 0; 7793994ee6fbf5185b3183f4585432226e786bfe86cTrond Myklebust nwords = XDR_QUADLEN(len); 780bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust padding = (nwords << 2) - len; 7811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds xdr->iov = iov = buf->tail; 7821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Compute remaining message length. */ 783bd00f84bc57f42df32c728e86329a5c30f221657Trond Myklebust end = ((xdr->nwords - nwords) << 2) + padding; 784bd00f84bc57f42df32c728e86329a5c30f221657Trond Myklebust if (end > iov->iov_len) 785bd00f84bc57f42df32c728e86329a5c30f221657Trond Myklebust end = iov->iov_len; 786bd00f84bc57f42df32c728e86329a5c30f221657Trond Myklebust 7871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 7881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Position current pointer at beginning of tail, and 7891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * set remaining message length. 7901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 791d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan xdr->p = (__be32 *)((char *)iov->iov_base + padding); 792d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan xdr->end = (__be32 *)((char *)iov->iov_base + end); 79376cacaabf15a593833d96a65a1a251002bd88178Trond Myklebust xdr->page_ptr = NULL; 794bfeea1dc1c9238f9e5a17a265489ecd0d19f66bbTrond Myklebust xdr->nwords = XDR_QUADLEN(end - padding); 795c337d3655ce85e12c7c476cb81406521926cacd2Trond Myklebust return len; 7961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 797468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_read_pages); 7981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7998b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust/** 8008b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * xdr_enter_page - decode data from the XDR page 8018b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * @xdr: pointer to xdr_stream struct 8028b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * @len: number of bytes of page data 8038b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * 8048b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * Moves data beyond the current pointer position from the XDR head[] buffer 8058b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * into the page list. Any data that lies beyond current position + "len" 8068b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * bytes is moved into the XDR tail[]. The current pointer is then 8078b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * repositioned at the beginning of the first XDR page. 8088b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust */ 8098b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebustvoid xdr_enter_page(struct xdr_stream *xdr, unsigned int len) 8108b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust{ 811f8bb7f08549a1ced9ceb69a9bd5e163122044ab2Trond Myklebust len = xdr_align_pages(xdr, len); 8128b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust /* 8138b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * Position current pointer at beginning of tail, and 8148b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust * set remaining message length. 8158b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust */ 816f8bb7f08549a1ced9ceb69a9bd5e163122044ab2Trond Myklebust if (len != 0) 817f8bb7f08549a1ced9ceb69a9bd5e163122044ab2Trond Myklebust xdr_set_page_base(xdr, 0, len); 8188b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust} 819468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_enter_page); 8208b23ea7bedb8b45a5bb56745fa3ff11018acf04eTrond Myklebust 8211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct kvec empty_iov = {.iov_base = NULL, .iov_len = 0}; 8221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid 8241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsxdr_buf_from_iov(struct kvec *iov, struct xdr_buf *buf) 8251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->head[0] = *iov; 8271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->tail[0] = empty_iov; 8281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->page_len = 0; 8291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf->buflen = buf->len = iov->iov_len; 8301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 831468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_buf_from_iov); 8321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* Sets subbuf to the portion of buf of length len beginning base bytes 8341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * from the start of buf. Returns -1 if base of length are out of bounds. */ 8351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint 8361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsxdr_buf_subsegment(struct xdr_buf *buf, struct xdr_buf *subbuf, 8371e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust unsigned int base, unsigned int len) 8381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds subbuf->buflen = subbuf->len = len; 8401e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust if (base < buf->head[0].iov_len) { 8411e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->head[0].iov_base = buf->head[0].iov_base + base; 8421e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->head[0].iov_len = min_t(unsigned int, len, 8431e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust buf->head[0].iov_len - base); 8441e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust len -= subbuf->head[0].iov_len; 8451e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust base = 0; 8461e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust } else { 8471e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->head[0].iov_base = NULL; 8481e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->head[0].iov_len = 0; 8491e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust base -= buf->head[0].iov_len; 8501e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust } 8511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (base < buf->page_len) { 8531e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->page_len = min(buf->page_len - base, len); 8541e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust base += buf->page_base; 8551e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->page_base = base & ~PAGE_CACHE_MASK; 8561e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->pages = &buf->pages[base >> PAGE_CACHE_SHIFT]; 8571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len -= subbuf->page_len; 8581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds base = 0; 8591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 8601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds base -= buf->page_len; 8611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds subbuf->page_len = 0; 8621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8641e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust if (base < buf->tail[0].iov_len) { 8651e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->tail[0].iov_base = buf->tail[0].iov_base + base; 8661e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->tail[0].iov_len = min_t(unsigned int, len, 8671e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust buf->tail[0].iov_len - base); 8681e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust len -= subbuf->tail[0].iov_len; 8691e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust base = 0; 8701e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust } else { 8711e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->tail[0].iov_base = NULL; 8721e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust subbuf->tail[0].iov_len = 0; 8731e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust base -= buf->tail[0].iov_len; 8741e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust } 8751e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust 8761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (base || len) 8771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -1; 8781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 8791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 880468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_buf_subsegment); 8811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8824c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton/** 8834c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton * xdr_buf_trim - lop at most "len" bytes off the end of "buf" 8844c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton * @buf: buf to be trimmed 8854c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton * @len: number of bytes to reduce "buf" by 8864c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton * 8874c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton * Trim an xdr_buf by the given number of bytes by fixing up the lengths. Note 8884c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton * that it's possible that we'll trim less than that amount if the xdr_buf is 8894c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton * too small, or if (for instance) it's all in the head and the parser has 8904c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton * already read too far into it. 8914c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton */ 8924c190e2f913f038c9c91ee63b59cd037260ba353Jeff Laytonvoid xdr_buf_trim(struct xdr_buf *buf, unsigned int len) 8934c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton{ 8944c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton size_t cur; 8954c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton unsigned int trim = len; 8964c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton 8974c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton if (buf->tail[0].iov_len) { 8984c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton cur = min_t(size_t, buf->tail[0].iov_len, trim); 8994c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton buf->tail[0].iov_len -= cur; 9004c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton trim -= cur; 9014c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton if (!trim) 9024c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton goto fix_len; 9034c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton } 9044c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton 9054c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton if (buf->page_len) { 9064c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton cur = min_t(unsigned int, buf->page_len, trim); 9074c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton buf->page_len -= cur; 9084c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton trim -= cur; 9094c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton if (!trim) 9104c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton goto fix_len; 9114c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton } 9124c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton 9134c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton if (buf->head[0].iov_len) { 9144c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton cur = min_t(size_t, buf->head[0].iov_len, trim); 9154c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton buf->head[0].iov_len -= cur; 9164c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton trim -= cur; 9174c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton } 9184c190e2f913f038c9c91ee63b59cd037260ba353Jeff Laytonfix_len: 9194c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton buf->len -= (len - trim); 9204c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton} 9214c190e2f913f038c9c91ee63b59cd037260ba353Jeff LaytonEXPORT_SYMBOL_GPL(xdr_buf_trim); 9224c190e2f913f038c9c91ee63b59cd037260ba353Jeff Layton 9234e3e43ad14c574281034a27420abf1993694ac11Trond Myklebuststatic void __read_bytes_from_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len) 9241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 9251e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebust unsigned int this_len; 9261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9274e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust this_len = min_t(unsigned int, len, subbuf->head[0].iov_len); 9284e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust memcpy(obj, subbuf->head[0].iov_base, this_len); 9291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len -= this_len; 9301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds obj += this_len; 9314e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust this_len = min_t(unsigned int, len, subbuf->page_len); 9321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (this_len) 9334e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust _copy_from_pages(obj, subbuf->pages, subbuf->page_base, this_len); 9341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len -= this_len; 9351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds obj += this_len; 9364e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust this_len = min_t(unsigned int, len, subbuf->tail[0].iov_len); 9374e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust memcpy(obj, subbuf->tail[0].iov_base, this_len); 9381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 9391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 940bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher/* obj is assumed to point to allocated memory of size at least len: */ 9414e3e43ad14c574281034a27420abf1993694ac11Trond Myklebustint read_bytes_from_xdr_buf(struct xdr_buf *buf, unsigned int base, void *obj, unsigned int len) 942bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher{ 943bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher struct xdr_buf subbuf; 944bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher int status; 945bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 946bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher status = xdr_buf_subsegment(buf, &subbuf, base, len); 9474e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust if (status != 0) 9484e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust return status; 9494e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust __read_bytes_from_xdr_buf(&subbuf, obj, len); 9504e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust return 0; 9514e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust} 952468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(read_bytes_from_xdr_buf); 9534e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust 9544e3e43ad14c574281034a27420abf1993694ac11Trond Myklebuststatic void __write_bytes_to_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len) 9554e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust{ 9564e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust unsigned int this_len; 9574e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust 9584e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust this_len = min_t(unsigned int, len, subbuf->head[0].iov_len); 9594e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust memcpy(subbuf->head[0].iov_base, obj, this_len); 960bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher len -= this_len; 961bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher obj += this_len; 9624e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust this_len = min_t(unsigned int, len, subbuf->page_len); 963bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (this_len) 9644e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust _copy_to_pages(subbuf->pages, subbuf->page_base, obj, this_len); 965bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher len -= this_len; 966bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher obj += this_len; 9674e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust this_len = min_t(unsigned int, len, subbuf->tail[0].iov_len); 9684e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust memcpy(subbuf->tail[0].iov_base, obj, this_len); 9694e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust} 9704e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust 9714e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust/* obj is assumed to point to allocated memory of size at least len: */ 9724e3e43ad14c574281034a27420abf1993694ac11Trond Myklebustint write_bytes_to_xdr_buf(struct xdr_buf *buf, unsigned int base, void *obj, unsigned int len) 9734e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust{ 9744e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust struct xdr_buf subbuf; 9754e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust int status; 9764e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust 9774e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust status = xdr_buf_subsegment(buf, &subbuf, base, len); 9784e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust if (status != 0) 9794e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust return status; 9804e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust __write_bytes_to_xdr_buf(&subbuf, obj, len); 9814e3e43ad14c574281034a27420abf1993694ac11Trond Myklebust return 0; 982bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher} 983c43abaedaff92a7bcbfe04b593164bb5faba3078Kevin CoffmanEXPORT_SYMBOL_GPL(write_bytes_to_xdr_buf); 984bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 985bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherint 9861e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebustxdr_decode_word(struct xdr_buf *buf, unsigned int base, u32 *obj) 9871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 988d8ed029d6000ba2e2908d9286409e4833c091b4cAlexey Dobriyan __be32 raw; 9891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int status; 9901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); 9921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (status) 9931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return status; 99498866b5abe1513cdacc011874ca045d40002eccdBenny Halevy *obj = be32_to_cpu(raw); 9951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 9961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 997468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_decode_word); 9981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 999bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherint 10001e78957e0a8f882df6a3660b62f9aae441f54891Trond Myklebustxdr_encode_word(struct xdr_buf *buf, unsigned int base, u32 obj) 1001bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher{ 10029f162d2a810b4db48f7b8d7e734d0932c81ec2a1Benny Halevy __be32 raw = cpu_to_be32(obj); 1003bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1004bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return write_bytes_to_xdr_buf(buf, base, &raw, sizeof(obj)); 1005bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher} 1006468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_encode_word); 1007bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 10081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* If the netobj starting offset bytes from the start of xdr_buf is contained 10091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * entirely in the head or the tail, set object to point to it; otherwise 10101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * try to find space for it at the end of the tail, copy it there, and 10111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * set obj to point to it. */ 1012bee57c99c322d64407b80c8171958b4384902da4Trond Myklebustint xdr_buf_read_netobj(struct xdr_buf *buf, struct xdr_netobj *obj, unsigned int offset) 10131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1014bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust struct xdr_buf subbuf; 10151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1016bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (xdr_decode_word(buf, offset, &obj->len)) 1017bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust return -EFAULT; 1018bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust if (xdr_buf_subsegment(buf, &subbuf, offset + 4, obj->len)) 1019bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust return -EFAULT; 1020bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust 1021bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust /* Is the obj contained entirely in the head? */ 1022bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust obj->data = subbuf.head[0].iov_base; 1023bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust if (subbuf.head[0].iov_len == obj->len) 1024bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust return 0; 1025bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust /* ..or is the obj contained entirely in the tail? */ 1026bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust obj->data = subbuf.tail[0].iov_base; 1027bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust if (subbuf.tail[0].iov_len == obj->len) 1028bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust return 0; 1029bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust 1030bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust /* use end of tail as storage for obj: 1031bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust * (We don't copy to the beginning because then we'd have 1032bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust * to worry about doing a potentially overlapping copy. 1033bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust * This assumes the object is at most half the length of the 1034bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust * tail.) */ 1035bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust if (obj->len > buf->buflen - buf->len) 1036bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust return -ENOMEM; 1037bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust if (buf->tail[0].iov_len != 0) 1038bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust obj->data = buf->tail[0].iov_base + buf->tail[0].iov_len; 1039bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust else 1040bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust obj->data = buf->head[0].iov_base + buf->head[0].iov_len; 1041bee57c99c322d64407b80c8171958b4384902da4Trond Myklebust __read_bytes_from_xdr_buf(&subbuf, obj->data, obj->len); 10421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 10431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1044468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_buf_read_netobj); 1045bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1046bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher/* Returns 0 on success, or else a negative error code. */ 1047bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherstatic int 1048bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherxdr_xcode_array2(struct xdr_buf *buf, unsigned int base, 1049bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher struct xdr_array2_desc *desc, int encode) 1050bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher{ 1051bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher char *elem = NULL, *c; 1052bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher unsigned int copied = 0, todo, avail_here; 1053bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher struct page **ppages = NULL; 1054bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher int err; 1055bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1056bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (encode) { 1057bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (xdr_encode_word(buf, base, desc->array_len) != 0) 1058bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return -EINVAL; 1059bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } else { 1060bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (xdr_decode_word(buf, base, &desc->array_len) != 0 || 106158fcb8df0bf663bb6b8f46cd3010bfe8d13d97cfTrond Myklebust desc->array_len > desc->array_maxlen || 1062bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher (unsigned long) base + 4 + desc->array_len * 1063bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher desc->elem_size > buf->len) 1064bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return -EINVAL; 1065bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1066bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base += 4; 1067bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1068bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!desc->xcode) 1069bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return 0; 1070bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1071bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher todo = desc->array_len * desc->elem_size; 1072bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1073bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher /* process head */ 1074bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (todo && base < buf->head->iov_len) { 1075bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c = buf->head->iov_base + base; 1076bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_here = min_t(unsigned int, todo, 1077bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher buf->head->iov_len - base); 1078bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher todo -= avail_here; 1079bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1080bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher while (avail_here >= desc->elem_size) { 1081bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, c); 1082bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 1083bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1084bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c += desc->elem_size; 1085bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_here -= desc->elem_size; 1086bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1087bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (avail_here) { 1088bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!elem) { 1089bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher elem = kmalloc(desc->elem_size, GFP_KERNEL); 1090bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = -ENOMEM; 1091bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!elem) 1092bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1093bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1094bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (encode) { 1095bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, elem); 1096bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 1097bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1098bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(c, elem, avail_here); 1099bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } else 1100bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(elem, c, avail_here); 1101bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied = avail_here; 1102bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1103bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base = buf->head->iov_len; /* align to start of pages */ 1104bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1105bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1106bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher /* process pages array */ 1107bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base -= buf->head->iov_len; 1108bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (todo && base < buf->page_len) { 1109bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher unsigned int avail_page; 1110bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1111bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_here = min(todo, buf->page_len - base); 1112bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher todo -= avail_here; 1113bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1114bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base += buf->page_base; 1115bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher ppages = buf->pages + (base >> PAGE_CACHE_SHIFT); 1116bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base &= ~PAGE_CACHE_MASK; 1117bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_page = min_t(unsigned int, PAGE_CACHE_SIZE - base, 1118bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_here); 1119bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c = kmap(*ppages) + base; 1120bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1121bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher while (avail_here) { 1122bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_here -= avail_page; 1123bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (copied || avail_page < desc->elem_size) { 1124bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher unsigned int l = min(avail_page, 1125bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher desc->elem_size - copied); 1126bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!elem) { 1127bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher elem = kmalloc(desc->elem_size, 1128bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher GFP_KERNEL); 1129bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = -ENOMEM; 1130bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!elem) 1131bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1132bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1133bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (encode) { 1134bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!copied) { 1135bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, elem); 1136bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 1137bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1138bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1139bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(c, elem + copied, l); 1140bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied += l; 1141bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (copied == desc->elem_size) 1142bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied = 0; 1143bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } else { 1144bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(elem + copied, c, l); 1145bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied += l; 1146bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (copied == desc->elem_size) { 1147bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, elem); 1148bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 1149bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1150bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied = 0; 1151bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1152bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1153bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_page -= l; 1154bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c += l; 1155bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1156bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher while (avail_page >= desc->elem_size) { 1157bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, c); 1158bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 1159bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1160bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c += desc->elem_size; 1161bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_page -= desc->elem_size; 1162bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1163bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (avail_page) { 1164bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher unsigned int l = min(avail_page, 1165bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher desc->elem_size - copied); 1166bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!elem) { 1167bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher elem = kmalloc(desc->elem_size, 1168bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher GFP_KERNEL); 1169bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = -ENOMEM; 1170bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!elem) 1171bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1172bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1173bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (encode) { 1174bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (!copied) { 1175bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, elem); 1176bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 1177bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1178bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1179bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(c, elem + copied, l); 1180bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied += l; 1181bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (copied == desc->elem_size) 1182bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied = 0; 1183bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } else { 1184bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(elem + copied, c, l); 1185bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied += l; 1186bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (copied == desc->elem_size) { 1187bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, elem); 1188bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 1189bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1190bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher copied = 0; 1191bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1192bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1193bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1194bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (avail_here) { 1195bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher kunmap(*ppages); 1196bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher ppages++; 1197bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c = kmap(*ppages); 1198bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1199bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1200bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher avail_page = min(avail_here, 1201bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher (unsigned int) PAGE_CACHE_SIZE); 1202bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1203bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base = buf->page_len; /* align to start of tail */ 1204bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1205bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1206bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher /* process tail */ 1207bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher base -= buf->page_len; 1208bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (todo) { 1209bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c = buf->tail->iov_base + base; 1210bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (copied) { 1211bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher unsigned int l = desc->elem_size - copied; 1212bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1213bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (encode) 1214bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(c, elem + copied, l); 1215bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher else { 1216bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher memcpy(elem + copied, c, l); 1217bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, elem); 1218bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 1219bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1220bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1221bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher todo -= l; 1222bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c += l; 1223bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1224bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher while (todo) { 1225bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = desc->xcode(desc, c); 1226bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (err) 1227bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher goto out; 1228bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher c += desc->elem_size; 1229bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher todo -= desc->elem_size; 1230bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1231bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher } 1232bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher err = 0; 1233bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1234bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherout: 1235a51482bde22f99c63fbbb57d5d46cc666384e379Jesper Juhl kfree(elem); 1236bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (ppages) 1237bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher kunmap(*ppages); 1238bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return err; 1239bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher} 1240bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1241bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherint 1242bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherxdr_decode_array2(struct xdr_buf *buf, unsigned int base, 1243bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher struct xdr_array2_desc *desc) 1244bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher{ 1245bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if (base >= buf->len) 1246bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return -EINVAL; 1247bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1248bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return xdr_xcode_array2(buf, base, desc, 0); 1249bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher} 1250468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_decode_array2); 1251bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1252bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherint 1253bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacherxdr_encode_array2(struct xdr_buf *buf, unsigned int base, 1254bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher struct xdr_array2_desc *desc) 1255bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher{ 1256bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher if ((unsigned long) base + 4 + desc->array_len * desc->elem_size > 1257bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher buf->head->iov_len + buf->page_len + buf->tail->iov_len) 1258bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return -EINVAL; 1259bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher 1260bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher return xdr_xcode_array2(buf, base, desc, 1); 1261bd8100e7eda87507649c6ba4cb32173b34e49986Andreas Gruenbacher} 1262468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_encode_array2); 126337a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia 126437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaiaint 126537a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaiaxdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, 1266cca5172a7ec10dfdb0b787cd8e9d5b0b8f179793YOSHIFUJI Hideaki int (*actor)(struct scatterlist *, void *), void *data) 126737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia{ 126837a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia int i, ret = 0; 126995c961747284a6b83a5e2d81240e214b0fa3464dEric Dumazet unsigned int page_len, thislen, page_offset; 127037a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia struct scatterlist sg[1]; 127137a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia 127268e3f5dd4db62619fdbe520d36c9ebf62e672256Herbert Xu sg_init_table(sg, 1); 127368e3f5dd4db62619fdbe520d36c9ebf62e672256Herbert Xu 127437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (offset >= buf->head[0].iov_len) { 127537a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia offset -= buf->head[0].iov_len; 127637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia } else { 127737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = buf->head[0].iov_len - offset; 127837a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (thislen > len) 127937a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = len; 128037a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia sg_set_buf(sg, buf->head[0].iov_base + offset, thislen); 128137a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia ret = actor(sg, data); 128237a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (ret) 128337a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia goto out; 128437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia offset = 0; 128537a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia len -= thislen; 128637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia } 128737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (len == 0) 128837a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia goto out; 128937a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia 129037a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (offset >= buf->page_len) { 129137a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia offset -= buf->page_len; 129237a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia } else { 129337a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia page_len = buf->page_len - offset; 129437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (page_len > len) 129537a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia page_len = len; 129637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia len -= page_len; 129737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia page_offset = (offset + buf->page_base) & (PAGE_CACHE_SIZE - 1); 129837a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia i = (offset + buf->page_base) >> PAGE_CACHE_SHIFT; 129937a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = PAGE_CACHE_SIZE - page_offset; 130037a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia do { 130137a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (thislen > page_len) 130237a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = page_len; 1303642f149031d70415d9318b919d50b71e4724adbdJens Axboe sg_set_page(sg, buf->pages[i], thislen, page_offset); 130437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia ret = actor(sg, data); 130537a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (ret) 130637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia goto out; 130737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia page_len -= thislen; 130837a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia i++; 130937a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia page_offset = 0; 131037a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = PAGE_CACHE_SIZE; 131137a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia } while (page_len != 0); 131237a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia offset = 0; 131337a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia } 131437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (len == 0) 131537a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia goto out; 131637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (offset < buf->tail[0].iov_len) { 131737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = buf->tail[0].iov_len - offset; 131837a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (thislen > len) 131937a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia thislen = len; 132037a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia sg_set_buf(sg, buf->tail[0].iov_base + offset, thislen); 132137a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia ret = actor(sg, data); 132237a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia len -= thislen; 132337a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia } 132437a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia if (len != 0) 132537a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia ret = -EINVAL; 132637a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaiaout: 132737a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia return ret; 132837a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia} 1329468039ee469c5772d3e39f736923c5e0c31017e2Trond MyklebustEXPORT_SYMBOL_GPL(xdr_process_buf); 133037a4e6cb0391f2293ba3d59e3a63ec0e56ed720dOlga Kornievskaia 1331