Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/net/sunrpc/xdr.c |
| 3 | * |
| 4 | * Generic XDR support. |
| 5 | * |
| 6 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> |
| 7 | */ |
| 8 | |
Chuck Lever | a246b01 | 2005-08-11 16:25:23 -0400 | [diff] [blame] | 9 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 10 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/string.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/pagemap.h> |
| 15 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/sunrpc/xdr.h> |
| 17 | #include <linux/sunrpc/msg_prot.h> |
| 18 | |
| 19 | /* |
| 20 | * XDR functions for basic NFS types |
| 21 | */ |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 22 | __be32 * |
| 23 | xdr_encode_netobj(__be32 *p, const struct xdr_netobj *obj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | { |
| 25 | unsigned int quadlen = XDR_QUADLEN(obj->len); |
| 26 | |
| 27 | p[quadlen] = 0; /* zero trailing bytes */ |
Benny Halevy | 9f162d2 | 2009-08-14 17:18:44 +0300 | [diff] [blame] | 28 | *p++ = cpu_to_be32(obj->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | memcpy(p, obj->data, obj->len); |
| 30 | return p + XDR_QUADLEN(obj->len); |
| 31 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 32 | EXPORT_SYMBOL_GPL(xdr_encode_netobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 34 | __be32 * |
| 35 | xdr_decode_netobj(__be32 *p, struct xdr_netobj *obj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | { |
| 37 | unsigned int len; |
| 38 | |
Benny Halevy | 98866b5 | 2009-08-14 17:18:49 +0300 | [diff] [blame] | 39 | if ((len = be32_to_cpu(*p++)) > XDR_MAX_NETOBJ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | return NULL; |
| 41 | obj->len = len; |
| 42 | obj->data = (u8 *) p; |
| 43 | return p + XDR_QUADLEN(len); |
| 44 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 45 | EXPORT_SYMBOL_GPL(xdr_decode_netobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
| 47 | /** |
| 48 | * xdr_encode_opaque_fixed - Encode fixed length opaque data |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 49 | * @p: pointer to current position in XDR buffer. |
| 50 | * @ptr: pointer to data to encode (or NULL) |
| 51 | * @nbytes: size of data. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | * |
| 53 | * Copy the array of data of length nbytes at ptr to the XDR buffer |
| 54 | * at position p, then align to the next 32-bit boundary by padding |
| 55 | * with zero bytes (see RFC1832). |
| 56 | * Note: if ptr is NULL, only the padding is performed. |
| 57 | * |
| 58 | * Returns the updated current XDR buffer position |
| 59 | * |
| 60 | */ |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 61 | __be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int nbytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | { |
| 63 | if (likely(nbytes != 0)) { |
| 64 | unsigned int quadlen = XDR_QUADLEN(nbytes); |
| 65 | unsigned int padding = (quadlen << 2) - nbytes; |
| 66 | |
| 67 | if (ptr != NULL) |
| 68 | memcpy(p, ptr, nbytes); |
| 69 | if (padding != 0) |
| 70 | memset((char *)p + nbytes, 0, padding); |
| 71 | p += quadlen; |
| 72 | } |
| 73 | return p; |
| 74 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 75 | EXPORT_SYMBOL_GPL(xdr_encode_opaque_fixed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
| 77 | /** |
| 78 | * xdr_encode_opaque - Encode variable length opaque data |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 79 | * @p: pointer to current position in XDR buffer. |
| 80 | * @ptr: pointer to data to encode (or NULL) |
| 81 | * @nbytes: size of data. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | * |
| 83 | * Returns the updated current XDR buffer position |
| 84 | */ |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 85 | __be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int nbytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | { |
Benny Halevy | 9f162d2 | 2009-08-14 17:18:44 +0300 | [diff] [blame] | 87 | *p++ = cpu_to_be32(nbytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | return xdr_encode_opaque_fixed(p, ptr, nbytes); |
| 89 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 90 | EXPORT_SYMBOL_GPL(xdr_encode_opaque); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 92 | __be32 * |
| 93 | xdr_encode_string(__be32 *p, const char *string) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | { |
| 95 | return xdr_encode_array(p, string, strlen(string)); |
| 96 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 97 | EXPORT_SYMBOL_GPL(xdr_encode_string); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 99 | __be32 * |
Chuck Lever | e5cff48 | 2007-11-01 16:56:47 -0400 | [diff] [blame] | 100 | xdr_decode_string_inplace(__be32 *p, char **sp, |
| 101 | unsigned int *lenp, unsigned int maxlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | { |
Chuck Lever | e5cff48 | 2007-11-01 16:56:47 -0400 | [diff] [blame] | 103 | u32 len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
Benny Halevy | 98866b5 | 2009-08-14 17:18:49 +0300 | [diff] [blame] | 105 | len = be32_to_cpu(*p++); |
Chuck Lever | e5cff48 | 2007-11-01 16:56:47 -0400 | [diff] [blame] | 106 | if (len > maxlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | return NULL; |
| 108 | *lenp = len; |
| 109 | *sp = (char *) p; |
| 110 | return p + XDR_QUADLEN(len); |
| 111 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 112 | EXPORT_SYMBOL_GPL(xdr_decode_string_inplace); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | |
Chuck Lever | b4687da | 2010-09-21 16:55:48 -0400 | [diff] [blame] | 114 | /** |
| 115 | * xdr_terminate_string - '\0'-terminate a string residing in an xdr_buf |
| 116 | * @buf: XDR buffer where string resides |
| 117 | * @len: length of string, in bytes |
| 118 | * |
| 119 | */ |
| 120 | void |
| 121 | xdr_terminate_string(struct xdr_buf *buf, const u32 len) |
| 122 | { |
| 123 | char *kaddr; |
| 124 | |
Cong Wang | b854178 | 2011-11-25 23:14:40 +0800 | [diff] [blame] | 125 | kaddr = kmap_atomic(buf->pages[0]); |
Chuck Lever | b4687da | 2010-09-21 16:55:48 -0400 | [diff] [blame] | 126 | kaddr[buf->page_base + len] = '\0'; |
Cong Wang | b854178 | 2011-11-25 23:14:40 +0800 | [diff] [blame] | 127 | kunmap_atomic(kaddr); |
Chuck Lever | b4687da | 2010-09-21 16:55:48 -0400 | [diff] [blame] | 128 | } |
Trond Myklebust | 0d961aa | 2011-07-13 19:24:15 -0400 | [diff] [blame] | 129 | EXPORT_SYMBOL_GPL(xdr_terminate_string); |
Chuck Lever | b4687da | 2010-09-21 16:55:48 -0400 | [diff] [blame] | 130 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | xdr_inline_pages(struct xdr_buf *xdr, unsigned int offset, |
| 133 | struct page **pages, unsigned int base, unsigned int len) |
| 134 | { |
| 135 | struct kvec *head = xdr->head; |
| 136 | struct kvec *tail = xdr->tail; |
| 137 | char *buf = (char *)head->iov_base; |
| 138 | unsigned int buflen = head->iov_len; |
| 139 | |
| 140 | head->iov_len = offset; |
| 141 | |
| 142 | xdr->pages = pages; |
| 143 | xdr->page_base = base; |
| 144 | xdr->page_len = len; |
| 145 | |
| 146 | tail->iov_base = buf + offset; |
| 147 | tail->iov_len = buflen - offset; |
| 148 | |
| 149 | xdr->buflen += len; |
| 150 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 151 | EXPORT_SYMBOL_GPL(xdr_inline_pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | /* |
| 154 | * Helper routines for doing 'memmove' like operations on a struct xdr_buf |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 155 | */ |
| 156 | |
| 157 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | * _shift_data_right_pages |
| 159 | * @pages: vector of pages containing both the source and dest memory area. |
| 160 | * @pgto_base: page vector address of destination |
| 161 | * @pgfrom_base: page vector address of source |
| 162 | * @len: number of bytes to copy |
| 163 | * |
| 164 | * Note: the addresses pgto_base and pgfrom_base are both calculated in |
| 165 | * the same way: |
| 166 | * if a memory area starts at byte 'base' in page 'pages[i]', |
| 167 | * then its address is given as (i << PAGE_CACHE_SHIFT) + base |
| 168 | * Also note: pgfrom_base must be < pgto_base, but the memory areas |
| 169 | * they point to may overlap. |
| 170 | */ |
| 171 | static void |
| 172 | _shift_data_right_pages(struct page **pages, size_t pgto_base, |
| 173 | size_t pgfrom_base, size_t len) |
| 174 | { |
| 175 | struct page **pgfrom, **pgto; |
| 176 | char *vfrom, *vto; |
| 177 | size_t copy; |
| 178 | |
| 179 | BUG_ON(pgto_base <= pgfrom_base); |
| 180 | |
| 181 | pgto_base += len; |
| 182 | pgfrom_base += len; |
| 183 | |
| 184 | pgto = pages + (pgto_base >> PAGE_CACHE_SHIFT); |
| 185 | pgfrom = pages + (pgfrom_base >> PAGE_CACHE_SHIFT); |
| 186 | |
| 187 | pgto_base &= ~PAGE_CACHE_MASK; |
| 188 | pgfrom_base &= ~PAGE_CACHE_MASK; |
| 189 | |
| 190 | do { |
| 191 | /* Are any pointers crossing a page boundary? */ |
| 192 | if (pgto_base == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | pgto_base = PAGE_CACHE_SIZE; |
| 194 | pgto--; |
| 195 | } |
| 196 | if (pgfrom_base == 0) { |
| 197 | pgfrom_base = PAGE_CACHE_SIZE; |
| 198 | pgfrom--; |
| 199 | } |
| 200 | |
| 201 | copy = len; |
| 202 | if (copy > pgto_base) |
| 203 | copy = pgto_base; |
| 204 | if (copy > pgfrom_base) |
| 205 | copy = pgfrom_base; |
| 206 | pgto_base -= copy; |
| 207 | pgfrom_base -= copy; |
| 208 | |
Cong Wang | b854178 | 2011-11-25 23:14:40 +0800 | [diff] [blame] | 209 | vto = kmap_atomic(*pgto); |
| 210 | vfrom = kmap_atomic(*pgfrom); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | memmove(vto + pgto_base, vfrom + pgfrom_base, copy); |
Trond Myklebust | bce3481 | 2006-07-05 13:17:12 -0400 | [diff] [blame] | 212 | flush_dcache_page(*pgto); |
Cong Wang | b854178 | 2011-11-25 23:14:40 +0800 | [diff] [blame] | 213 | kunmap_atomic(vfrom); |
| 214 | kunmap_atomic(vto); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | |
| 216 | } while ((len -= copy) != 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | } |
| 218 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 219 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | * _copy_to_pages |
| 221 | * @pages: array of pages |
| 222 | * @pgbase: page vector address of destination |
| 223 | * @p: pointer to source data |
| 224 | * @len: length |
| 225 | * |
| 226 | * Copies data from an arbitrary memory location into an array of pages |
| 227 | * The copy is assumed to be non-overlapping. |
| 228 | */ |
| 229 | static void |
| 230 | _copy_to_pages(struct page **pages, size_t pgbase, const char *p, size_t len) |
| 231 | { |
| 232 | struct page **pgto; |
| 233 | char *vto; |
| 234 | size_t copy; |
| 235 | |
| 236 | pgto = pages + (pgbase >> PAGE_CACHE_SHIFT); |
| 237 | pgbase &= ~PAGE_CACHE_MASK; |
| 238 | |
Trond Myklebust | daeba89 | 2008-03-31 17:02:02 -0400 | [diff] [blame] | 239 | for (;;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | copy = PAGE_CACHE_SIZE - pgbase; |
| 241 | if (copy > len) |
| 242 | copy = len; |
| 243 | |
Cong Wang | b854178 | 2011-11-25 23:14:40 +0800 | [diff] [blame] | 244 | vto = kmap_atomic(*pgto); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | memcpy(vto + pgbase, p, copy); |
Cong Wang | b854178 | 2011-11-25 23:14:40 +0800 | [diff] [blame] | 246 | kunmap_atomic(vto); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
Trond Myklebust | daeba89 | 2008-03-31 17:02:02 -0400 | [diff] [blame] | 248 | len -= copy; |
| 249 | if (len == 0) |
| 250 | break; |
| 251 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | pgbase += copy; |
| 253 | if (pgbase == PAGE_CACHE_SIZE) { |
| 254 | flush_dcache_page(*pgto); |
| 255 | pgbase = 0; |
| 256 | pgto++; |
| 257 | } |
| 258 | p += copy; |
Trond Myklebust | daeba89 | 2008-03-31 17:02:02 -0400 | [diff] [blame] | 259 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | flush_dcache_page(*pgto); |
| 261 | } |
| 262 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 263 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | * _copy_from_pages |
| 265 | * @p: pointer to destination |
| 266 | * @pages: array of pages |
| 267 | * @pgbase: offset of source data |
| 268 | * @len: length |
| 269 | * |
| 270 | * Copies data into an arbitrary memory location from an array of pages |
| 271 | * The copy is assumed to be non-overlapping. |
| 272 | */ |
Andy Adamson | bf118a3 | 2011-12-07 11:55:27 -0500 | [diff] [blame] | 273 | void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | _copy_from_pages(char *p, struct page **pages, size_t pgbase, size_t len) |
| 275 | { |
| 276 | struct page **pgfrom; |
| 277 | char *vfrom; |
| 278 | size_t copy; |
| 279 | |
| 280 | pgfrom = pages + (pgbase >> PAGE_CACHE_SHIFT); |
| 281 | pgbase &= ~PAGE_CACHE_MASK; |
| 282 | |
| 283 | do { |
| 284 | copy = PAGE_CACHE_SIZE - pgbase; |
| 285 | if (copy > len) |
| 286 | copy = len; |
| 287 | |
Cong Wang | b854178 | 2011-11-25 23:14:40 +0800 | [diff] [blame] | 288 | vfrom = kmap_atomic(*pgfrom); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | memcpy(p, vfrom + pgbase, copy); |
Cong Wang | b854178 | 2011-11-25 23:14:40 +0800 | [diff] [blame] | 290 | kunmap_atomic(vfrom); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
| 292 | pgbase += copy; |
| 293 | if (pgbase == PAGE_CACHE_SIZE) { |
| 294 | pgbase = 0; |
| 295 | pgfrom++; |
| 296 | } |
| 297 | p += copy; |
| 298 | |
| 299 | } while ((len -= copy) != 0); |
| 300 | } |
Andy Adamson | bf118a3 | 2011-12-07 11:55:27 -0500 | [diff] [blame] | 301 | EXPORT_SYMBOL_GPL(_copy_from_pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 303 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | * xdr_shrink_bufhead |
| 305 | * @buf: xdr_buf |
| 306 | * @len: bytes to remove from buf->head[0] |
| 307 | * |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 308 | * Shrinks XDR buffer's header kvec buf->head[0] by |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | * 'len' bytes. The extra data is not lost, but is instead |
| 310 | * moved into the inlined pages and/or the tail. |
| 311 | */ |
| 312 | static void |
| 313 | xdr_shrink_bufhead(struct xdr_buf *buf, size_t len) |
| 314 | { |
| 315 | struct kvec *head, *tail; |
| 316 | size_t copy, offs; |
| 317 | unsigned int pglen = buf->page_len; |
| 318 | |
| 319 | tail = buf->tail; |
| 320 | head = buf->head; |
| 321 | BUG_ON (len > head->iov_len); |
| 322 | |
| 323 | /* Shift the tail first */ |
| 324 | if (tail->iov_len != 0) { |
| 325 | if (tail->iov_len > len) { |
| 326 | copy = tail->iov_len - len; |
| 327 | memmove((char *)tail->iov_base + len, |
| 328 | tail->iov_base, copy); |
| 329 | } |
| 330 | /* Copy from the inlined pages into the tail */ |
| 331 | copy = len; |
| 332 | if (copy > pglen) |
| 333 | copy = pglen; |
| 334 | offs = len - copy; |
| 335 | if (offs >= tail->iov_len) |
| 336 | copy = 0; |
| 337 | else if (copy > tail->iov_len - offs) |
| 338 | copy = tail->iov_len - offs; |
| 339 | if (copy != 0) |
| 340 | _copy_from_pages((char *)tail->iov_base + offs, |
| 341 | buf->pages, |
| 342 | buf->page_base + pglen + offs - len, |
| 343 | copy); |
| 344 | /* Do we also need to copy data from the head into the tail ? */ |
| 345 | if (len > pglen) { |
| 346 | offs = copy = len - pglen; |
| 347 | if (copy > tail->iov_len) |
| 348 | copy = tail->iov_len; |
| 349 | memcpy(tail->iov_base, |
| 350 | (char *)head->iov_base + |
| 351 | head->iov_len - offs, |
| 352 | copy); |
| 353 | } |
| 354 | } |
| 355 | /* Now handle pages */ |
| 356 | if (pglen != 0) { |
| 357 | if (pglen > len) |
| 358 | _shift_data_right_pages(buf->pages, |
| 359 | buf->page_base + len, |
| 360 | buf->page_base, |
| 361 | pglen - len); |
| 362 | copy = len; |
| 363 | if (len > pglen) |
| 364 | copy = pglen; |
| 365 | _copy_to_pages(buf->pages, buf->page_base, |
| 366 | (char *)head->iov_base + head->iov_len - len, |
| 367 | copy); |
| 368 | } |
| 369 | head->iov_len -= len; |
| 370 | buf->buflen -= len; |
| 371 | /* Have we truncated the message? */ |
| 372 | if (buf->len > buf->buflen) |
| 373 | buf->len = buf->buflen; |
| 374 | } |
| 375 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 376 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | * xdr_shrink_pagelen |
| 378 | * @buf: xdr_buf |
| 379 | * @len: bytes to remove from buf->pages |
| 380 | * |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 381 | * Shrinks XDR buffer's page array buf->pages by |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | * 'len' bytes. The extra data is not lost, but is instead |
| 383 | * moved into the tail. |
| 384 | */ |
| 385 | static void |
| 386 | xdr_shrink_pagelen(struct xdr_buf *buf, size_t len) |
| 387 | { |
| 388 | struct kvec *tail; |
| 389 | size_t copy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | unsigned int pglen = buf->page_len; |
Trond Myklebust | cf187c2 | 2010-08-29 12:13:16 -0400 | [diff] [blame] | 391 | unsigned int tailbuf_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | |
| 393 | tail = buf->tail; |
| 394 | BUG_ON (len > pglen); |
| 395 | |
Trond Myklebust | cf187c2 | 2010-08-29 12:13:16 -0400 | [diff] [blame] | 396 | tailbuf_len = buf->buflen - buf->head->iov_len - buf->page_len; |
| 397 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | /* Shift the tail first */ |
Trond Myklebust | cf187c2 | 2010-08-29 12:13:16 -0400 | [diff] [blame] | 399 | if (tailbuf_len != 0) { |
| 400 | unsigned int free_space = tailbuf_len - tail->iov_len; |
| 401 | |
| 402 | if (len < free_space) |
| 403 | free_space = len; |
| 404 | tail->iov_len += free_space; |
| 405 | |
Benny Halevy | 42d6d8a | 2010-08-29 12:13:15 -0400 | [diff] [blame] | 406 | copy = len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | if (tail->iov_len > len) { |
Benny Halevy | 0fe62a35 | 2010-08-29 12:13:15 -0400 | [diff] [blame] | 408 | char *p = (char *)tail->iov_base + len; |
Benny Halevy | 2e29ebb | 2010-08-29 12:13:15 -0400 | [diff] [blame] | 409 | memmove(p, tail->iov_base, tail->iov_len - len); |
Benny Halevy | 42d6d8a | 2010-08-29 12:13:15 -0400 | [diff] [blame] | 410 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | copy = tail->iov_len; |
Benny Halevy | 42d6d8a | 2010-08-29 12:13:15 -0400 | [diff] [blame] | 412 | /* Copy from the inlined pages into the tail */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | _copy_from_pages((char *)tail->iov_base, |
| 414 | buf->pages, buf->page_base + pglen - len, |
| 415 | copy); |
| 416 | } |
| 417 | buf->page_len -= len; |
| 418 | buf->buflen -= len; |
| 419 | /* Have we truncated the message? */ |
| 420 | if (buf->len > buf->buflen) |
| 421 | buf->len = buf->buflen; |
| 422 | } |
| 423 | |
| 424 | void |
| 425 | xdr_shift_buf(struct xdr_buf *buf, size_t len) |
| 426 | { |
| 427 | xdr_shrink_bufhead(buf, len); |
| 428 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 429 | EXPORT_SYMBOL_GPL(xdr_shift_buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | |
| 431 | /** |
Trond Myklebust | 4517d52 | 2012-06-21 17:14:46 -0400 | [diff] [blame] | 432 | * xdr_stream_pos - Return the current offset from the start of the xdr_stream |
| 433 | * @xdr: pointer to struct xdr_stream |
| 434 | */ |
| 435 | unsigned int xdr_stream_pos(const struct xdr_stream *xdr) |
| 436 | { |
| 437 | return (unsigned int)(XDR_QUADLEN(xdr->buf->len) - xdr->nwords) << 2; |
| 438 | } |
| 439 | EXPORT_SYMBOL_GPL(xdr_stream_pos); |
| 440 | |
| 441 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | * xdr_init_encode - Initialize a struct xdr_stream for sending data. |
| 443 | * @xdr: pointer to xdr_stream struct |
| 444 | * @buf: pointer to XDR buffer in which to encode data |
| 445 | * @p: current pointer inside XDR buffer |
| 446 | * |
| 447 | * Note: at the moment the RPC client only passes the length of our |
| 448 | * scratch buffer in the xdr_buf's header kvec. Previously this |
| 449 | * meant we needed to call xdr_adjust_iovec() after encoding the |
| 450 | * data. With the new scheme, the xdr_stream manages the details |
| 451 | * of the buffer length, and takes care of adjusting the kvec |
| 452 | * length for us. |
| 453 | */ |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 454 | void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | { |
| 456 | struct kvec *iov = buf->head; |
Trond Myklebust | 334ccfd | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 457 | int scratch_len = buf->buflen - buf->page_len - buf->tail[0].iov_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | |
Trond Myklebust | 334ccfd | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 459 | BUG_ON(scratch_len < 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | xdr->buf = buf; |
| 461 | xdr->iov = iov; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 462 | xdr->p = (__be32 *)((char *)iov->iov_base + iov->iov_len); |
| 463 | xdr->end = (__be32 *)((char *)iov->iov_base + scratch_len); |
Trond Myklebust | 334ccfd | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 464 | BUG_ON(iov->iov_len > scratch_len); |
| 465 | |
| 466 | if (p != xdr->p && p != NULL) { |
| 467 | size_t len; |
| 468 | |
| 469 | BUG_ON(p < xdr->p || p > xdr->end); |
| 470 | len = (char *)p - (char *)xdr->p; |
| 471 | xdr->p = p; |
| 472 | buf->len += len; |
| 473 | iov->iov_len += len; |
| 474 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 476 | EXPORT_SYMBOL_GPL(xdr_init_encode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | |
| 478 | /** |
| 479 | * xdr_reserve_space - Reserve buffer space for sending |
| 480 | * @xdr: pointer to xdr_stream |
| 481 | * @nbytes: number of bytes to reserve |
| 482 | * |
| 483 | * Checks that we have enough buffer space to encode 'nbytes' more |
| 484 | * bytes of data. If so, update the total xdr_buf length, and |
| 485 | * adjust the length of the current kvec. |
| 486 | */ |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 487 | __be32 * xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | { |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 489 | __be32 *p = xdr->p; |
| 490 | __be32 *q; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | |
| 492 | /* align nbytes on the next 32-bit boundary */ |
| 493 | nbytes += 3; |
| 494 | nbytes &= ~3; |
| 495 | q = p + (nbytes >> 2); |
| 496 | if (unlikely(q > xdr->end || q < p)) |
| 497 | return NULL; |
| 498 | xdr->p = q; |
| 499 | xdr->iov->iov_len += nbytes; |
| 500 | xdr->buf->len += nbytes; |
| 501 | return p; |
| 502 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 503 | EXPORT_SYMBOL_GPL(xdr_reserve_space); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | |
| 505 | /** |
| 506 | * xdr_write_pages - Insert a list of pages into an XDR buffer for sending |
| 507 | * @xdr: pointer to xdr_stream |
| 508 | * @pages: list of pages |
| 509 | * @base: offset of first byte |
| 510 | * @len: length of data in bytes |
| 511 | * |
| 512 | */ |
| 513 | void xdr_write_pages(struct xdr_stream *xdr, struct page **pages, unsigned int base, |
| 514 | unsigned int len) |
| 515 | { |
| 516 | struct xdr_buf *buf = xdr->buf; |
| 517 | struct kvec *iov = buf->tail; |
| 518 | buf->pages = pages; |
| 519 | buf->page_base = base; |
| 520 | buf->page_len = len; |
| 521 | |
| 522 | iov->iov_base = (char *)xdr->p; |
| 523 | iov->iov_len = 0; |
| 524 | xdr->iov = iov; |
| 525 | |
| 526 | if (len & 3) { |
| 527 | unsigned int pad = 4 - (len & 3); |
| 528 | |
| 529 | BUG_ON(xdr->p >= xdr->end); |
| 530 | iov->iov_base = (char *)xdr->p + (len & 3); |
| 531 | iov->iov_len += pad; |
| 532 | len += pad; |
| 533 | *xdr->p++ = 0; |
| 534 | } |
| 535 | buf->buflen += len; |
| 536 | buf->len += len; |
| 537 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 538 | EXPORT_SYMBOL_GPL(xdr_write_pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 540 | static void xdr_set_iov(struct xdr_stream *xdr, struct kvec *iov, |
Trond Myklebust | 1537693 | 2012-06-28 17:17:48 -0400 | [diff] [blame] | 541 | unsigned int len) |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 542 | { |
| 543 | if (len > iov->iov_len) |
| 544 | len = iov->iov_len; |
Trond Myklebust | 1537693 | 2012-06-28 17:17:48 -0400 | [diff] [blame] | 545 | xdr->p = (__be32*)iov->iov_base; |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 546 | xdr->end = (__be32*)(iov->iov_base + len); |
| 547 | xdr->iov = iov; |
| 548 | xdr->page_ptr = NULL; |
| 549 | } |
| 550 | |
| 551 | static int xdr_set_page_base(struct xdr_stream *xdr, |
| 552 | unsigned int base, unsigned int len) |
| 553 | { |
| 554 | unsigned int pgnr; |
| 555 | unsigned int maxlen; |
| 556 | unsigned int pgoff; |
| 557 | unsigned int pgend; |
| 558 | void *kaddr; |
| 559 | |
| 560 | maxlen = xdr->buf->page_len; |
| 561 | if (base >= maxlen) |
| 562 | return -EINVAL; |
| 563 | maxlen -= base; |
| 564 | if (len > maxlen) |
| 565 | len = maxlen; |
| 566 | |
| 567 | base += xdr->buf->page_base; |
| 568 | |
| 569 | pgnr = base >> PAGE_SHIFT; |
| 570 | xdr->page_ptr = &xdr->buf->pages[pgnr]; |
| 571 | kaddr = page_address(*xdr->page_ptr); |
| 572 | |
| 573 | pgoff = base & ~PAGE_MASK; |
| 574 | xdr->p = (__be32*)(kaddr + pgoff); |
| 575 | |
| 576 | pgend = pgoff + len; |
| 577 | if (pgend > PAGE_SIZE) |
| 578 | pgend = PAGE_SIZE; |
| 579 | xdr->end = (__be32*)(kaddr + pgend); |
| 580 | xdr->iov = NULL; |
| 581 | return 0; |
| 582 | } |
| 583 | |
| 584 | static void xdr_set_next_page(struct xdr_stream *xdr) |
| 585 | { |
| 586 | unsigned int newbase; |
| 587 | |
| 588 | newbase = (1 + xdr->page_ptr - xdr->buf->pages) << PAGE_SHIFT; |
| 589 | newbase -= xdr->buf->page_base; |
| 590 | |
| 591 | if (xdr_set_page_base(xdr, newbase, PAGE_SIZE) < 0) |
Trond Myklebust | 1537693 | 2012-06-28 17:17:48 -0400 | [diff] [blame] | 592 | xdr_set_iov(xdr, xdr->buf->tail, xdr->buf->len); |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 593 | } |
| 594 | |
| 595 | static bool xdr_set_next_buffer(struct xdr_stream *xdr) |
| 596 | { |
| 597 | if (xdr->page_ptr != NULL) |
| 598 | xdr_set_next_page(xdr); |
| 599 | else if (xdr->iov == xdr->buf->head) { |
| 600 | if (xdr_set_page_base(xdr, 0, PAGE_SIZE) < 0) |
Trond Myklebust | 1537693 | 2012-06-28 17:17:48 -0400 | [diff] [blame] | 601 | xdr_set_iov(xdr, xdr->buf->tail, xdr->buf->len); |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 602 | } |
| 603 | return xdr->p != xdr->end; |
| 604 | } |
| 605 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | /** |
| 607 | * xdr_init_decode - Initialize an xdr_stream for decoding data. |
| 608 | * @xdr: pointer to xdr_stream struct |
| 609 | * @buf: pointer to XDR buffer from which to decode data |
| 610 | * @p: current pointer inside XDR buffer |
| 611 | */ |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 612 | void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | xdr->buf = buf; |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 615 | xdr->scratch.iov_base = NULL; |
| 616 | xdr->scratch.iov_len = 0; |
Trond Myklebust | bfeea1d | 2012-06-20 09:58:35 -0400 | [diff] [blame] | 617 | xdr->nwords = XDR_QUADLEN(buf->len); |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 618 | if (buf->head[0].iov_len != 0) |
Trond Myklebust | 1537693 | 2012-06-28 17:17:48 -0400 | [diff] [blame] | 619 | xdr_set_iov(xdr, buf->head, buf->len); |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 620 | else if (buf->page_len != 0) |
| 621 | xdr_set_page_base(xdr, 0, buf->len); |
Trond Myklebust | bfeea1d | 2012-06-20 09:58:35 -0400 | [diff] [blame] | 622 | if (p != NULL && p > xdr->p && xdr->end >= p) { |
| 623 | xdr->nwords -= p - xdr->p; |
Trond Myklebust | 1537693 | 2012-06-28 17:17:48 -0400 | [diff] [blame] | 624 | xdr->p = p; |
Trond Myklebust | bfeea1d | 2012-06-20 09:58:35 -0400 | [diff] [blame] | 625 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 627 | EXPORT_SYMBOL_GPL(xdr_init_decode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | |
Benny Halevy | f7da7a1 | 2011-05-19 14:16:47 -0400 | [diff] [blame] | 629 | /** |
| 630 | * xdr_init_decode - Initialize an xdr_stream for decoding data. |
| 631 | * @xdr: pointer to xdr_stream struct |
| 632 | * @buf: pointer to XDR buffer from which to decode data |
| 633 | * @pages: list of pages to decode into |
| 634 | * @len: length in bytes of buffer in pages |
| 635 | */ |
| 636 | void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf, |
| 637 | struct page **pages, unsigned int len) |
| 638 | { |
| 639 | memset(buf, 0, sizeof(*buf)); |
| 640 | buf->pages = pages; |
| 641 | buf->page_len = len; |
| 642 | buf->buflen = len; |
| 643 | buf->len = len; |
| 644 | xdr_init_decode(xdr, buf, NULL); |
| 645 | } |
| 646 | EXPORT_SYMBOL_GPL(xdr_init_decode_pages); |
| 647 | |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 648 | static __be32 * __xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes) |
Trond Myklebust | ba8e452 | 2010-10-19 19:58:49 -0400 | [diff] [blame] | 649 | { |
Trond Myklebust | bfeea1d | 2012-06-20 09:58:35 -0400 | [diff] [blame] | 650 | unsigned int nwords = XDR_QUADLEN(nbytes); |
Trond Myklebust | ba8e452 | 2010-10-19 19:58:49 -0400 | [diff] [blame] | 651 | __be32 *p = xdr->p; |
Trond Myklebust | bfeea1d | 2012-06-20 09:58:35 -0400 | [diff] [blame] | 652 | __be32 *q = p + nwords; |
Trond Myklebust | ba8e452 | 2010-10-19 19:58:49 -0400 | [diff] [blame] | 653 | |
Trond Myklebust | bfeea1d | 2012-06-20 09:58:35 -0400 | [diff] [blame] | 654 | if (unlikely(nwords > xdr->nwords || q > xdr->end || q < p)) |
Trond Myklebust | ba8e452 | 2010-10-19 19:58:49 -0400 | [diff] [blame] | 655 | return NULL; |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 656 | xdr->p = q; |
Trond Myklebust | bfeea1d | 2012-06-20 09:58:35 -0400 | [diff] [blame] | 657 | xdr->nwords -= nwords; |
Trond Myklebust | ba8e452 | 2010-10-19 19:58:49 -0400 | [diff] [blame] | 658 | return p; |
| 659 | } |
Trond Myklebust | ba8e452 | 2010-10-19 19:58:49 -0400 | [diff] [blame] | 660 | |
| 661 | /** |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 662 | * xdr_set_scratch_buffer - Attach a scratch buffer for decoding data. |
| 663 | * @xdr: pointer to xdr_stream struct |
| 664 | * @buf: pointer to an empty buffer |
| 665 | * @buflen: size of 'buf' |
| 666 | * |
| 667 | * The scratch buffer is used when decoding from an array of pages. |
| 668 | * If an xdr_inline_decode() call spans across page boundaries, then |
| 669 | * we copy the data into the scratch buffer in order to allow linear |
| 670 | * access. |
| 671 | */ |
| 672 | void xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen) |
| 673 | { |
| 674 | xdr->scratch.iov_base = buf; |
| 675 | xdr->scratch.iov_len = buflen; |
| 676 | } |
| 677 | EXPORT_SYMBOL_GPL(xdr_set_scratch_buffer); |
| 678 | |
| 679 | static __be32 *xdr_copy_to_scratch(struct xdr_stream *xdr, size_t nbytes) |
| 680 | { |
| 681 | __be32 *p; |
| 682 | void *cpdest = xdr->scratch.iov_base; |
| 683 | size_t cplen = (char *)xdr->end - (char *)xdr->p; |
| 684 | |
| 685 | if (nbytes > xdr->scratch.iov_len) |
| 686 | return NULL; |
| 687 | memcpy(cpdest, xdr->p, cplen); |
| 688 | cpdest += cplen; |
| 689 | nbytes -= cplen; |
| 690 | if (!xdr_set_next_buffer(xdr)) |
| 691 | return NULL; |
| 692 | p = __xdr_inline_decode(xdr, nbytes); |
| 693 | if (p == NULL) |
| 694 | return NULL; |
| 695 | memcpy(cpdest, p, nbytes); |
| 696 | return xdr->scratch.iov_base; |
| 697 | } |
| 698 | |
| 699 | /** |
| 700 | * xdr_inline_decode - Retrieve XDR data to decode |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | * @xdr: pointer to xdr_stream struct |
| 702 | * @nbytes: number of bytes of data to decode |
| 703 | * |
| 704 | * Check if the input buffer is long enough to enable us to decode |
| 705 | * 'nbytes' more bytes of data starting at the current position. |
| 706 | * If so return the current pointer, then update the current |
| 707 | * pointer position. |
| 708 | */ |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 709 | __be32 * xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | { |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 711 | __be32 *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 713 | if (nbytes == 0) |
| 714 | return xdr->p; |
| 715 | if (xdr->p == xdr->end && !xdr_set_next_buffer(xdr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | return NULL; |
Trond Myklebust | 6650239 | 2011-01-08 17:45:38 -0500 | [diff] [blame] | 717 | p = __xdr_inline_decode(xdr, nbytes); |
| 718 | if (p != NULL) |
| 719 | return p; |
| 720 | return xdr_copy_to_scratch(xdr, nbytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 722 | EXPORT_SYMBOL_GPL(xdr_inline_decode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
Trond Myklebust | 3994ee6 | 2012-06-26 12:34:05 -0400 | [diff] [blame] | 724 | static unsigned int xdr_align_pages(struct xdr_stream *xdr, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | { |
| 726 | struct xdr_buf *buf = xdr->buf; |
| 727 | struct kvec *iov; |
Trond Myklebust | bfeea1d | 2012-06-20 09:58:35 -0400 | [diff] [blame] | 728 | unsigned int nwords = XDR_QUADLEN(len); |
Trond Myklebust | b760b31 | 2012-06-26 12:19:55 -0400 | [diff] [blame] | 729 | unsigned int cur = xdr_stream_pos(xdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | |
Trond Myklebust | bfeea1d | 2012-06-20 09:58:35 -0400 | [diff] [blame] | 731 | if (xdr->nwords == 0) |
Trond Myklebust | c337d36 | 2012-06-21 17:05:37 -0400 | [diff] [blame] | 732 | return 0; |
Trond Myklebust | bfeea1d | 2012-06-20 09:58:35 -0400 | [diff] [blame] | 733 | if (nwords > xdr->nwords) { |
| 734 | nwords = xdr->nwords; |
| 735 | len = nwords << 2; |
| 736 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | /* Realign pages to current pointer position */ |
| 738 | iov = buf->head; |
Trond Myklebust | b760b31 | 2012-06-26 12:19:55 -0400 | [diff] [blame] | 739 | if (iov->iov_len > cur) |
| 740 | xdr_shrink_bufhead(buf, iov->iov_len - cur); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | |
| 742 | /* Truncate page data and move it into the tail */ |
| 743 | if (buf->page_len > len) |
| 744 | xdr_shrink_pagelen(buf, buf->page_len - len); |
Trond Myklebust | bd00f84 | 2012-06-26 13:50:43 -0400 | [diff] [blame] | 745 | xdr->nwords = XDR_QUADLEN(buf->len - cur); |
Trond Myklebust | 3994ee6 | 2012-06-26 12:34:05 -0400 | [diff] [blame] | 746 | return len; |
| 747 | } |
Trond Myklebust | bd00f84 | 2012-06-26 13:50:43 -0400 | [diff] [blame] | 748 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | /** |
| 750 | * xdr_read_pages - Ensure page-based XDR data to decode is aligned at current pointer position |
| 751 | * @xdr: pointer to xdr_stream struct |
| 752 | * @len: number of bytes of page data |
| 753 | * |
| 754 | * Moves data beyond the current pointer position from the XDR head[] buffer |
| 755 | * into the page list. Any data that lies beyond current position + "len" |
| 756 | * bytes is moved into the XDR tail[]. |
Trond Myklebust | 3994ee6 | 2012-06-26 12:34:05 -0400 | [diff] [blame] | 757 | * |
| 758 | * Returns the number of XDR encoded bytes now contained in the pages |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | */ |
Trond Myklebust | 3994ee6 | 2012-06-26 12:34:05 -0400 | [diff] [blame] | 760 | unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | { |
| 762 | struct xdr_buf *buf = xdr->buf; |
| 763 | struct kvec *iov; |
Trond Myklebust | 3994ee6 | 2012-06-26 12:34:05 -0400 | [diff] [blame] | 764 | unsigned int nwords; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | unsigned int end; |
Trond Myklebust | 3994ee6 | 2012-06-26 12:34:05 -0400 | [diff] [blame] | 766 | unsigned int padding; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | |
Trond Myklebust | 3994ee6 | 2012-06-26 12:34:05 -0400 | [diff] [blame] | 768 | len = xdr_align_pages(xdr, len); |
| 769 | if (len == 0) |
| 770 | return 0; |
| 771 | nwords = XDR_QUADLEN(len); |
Trond Myklebust | bfeea1d | 2012-06-20 09:58:35 -0400 | [diff] [blame] | 772 | padding = (nwords << 2) - len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | xdr->iov = iov = buf->tail; |
| 774 | /* Compute remaining message length. */ |
Trond Myklebust | bd00f84 | 2012-06-26 13:50:43 -0400 | [diff] [blame] | 775 | end = ((xdr->nwords - nwords) << 2) + padding; |
| 776 | if (end > iov->iov_len) |
| 777 | end = iov->iov_len; |
| 778 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | /* |
| 780 | * Position current pointer at beginning of tail, and |
| 781 | * set remaining message length. |
| 782 | */ |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 783 | xdr->p = (__be32 *)((char *)iov->iov_base + padding); |
| 784 | xdr->end = (__be32 *)((char *)iov->iov_base + end); |
Trond Myklebust | 76cacaa | 2012-06-26 15:32:40 -0400 | [diff] [blame] | 785 | xdr->page_ptr = NULL; |
Trond Myklebust | bfeea1d | 2012-06-20 09:58:35 -0400 | [diff] [blame] | 786 | xdr->nwords = XDR_QUADLEN(end - padding); |
Trond Myklebust | c337d36 | 2012-06-21 17:05:37 -0400 | [diff] [blame] | 787 | return len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 789 | EXPORT_SYMBOL_GPL(xdr_read_pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | |
Trond Myklebust | 8b23ea7 | 2006-06-09 09:34:21 -0400 | [diff] [blame] | 791 | /** |
| 792 | * xdr_enter_page - decode data from the XDR page |
| 793 | * @xdr: pointer to xdr_stream struct |
| 794 | * @len: number of bytes of page data |
| 795 | * |
| 796 | * Moves data beyond the current pointer position from the XDR head[] buffer |
| 797 | * into the page list. Any data that lies beyond current position + "len" |
| 798 | * bytes is moved into the XDR tail[]. The current pointer is then |
| 799 | * repositioned at the beginning of the first XDR page. |
| 800 | */ |
| 801 | void xdr_enter_page(struct xdr_stream *xdr, unsigned int len) |
| 802 | { |
Trond Myklebust | f8bb7f0 | 2012-06-21 14:53:10 -0400 | [diff] [blame] | 803 | len = xdr_align_pages(xdr, len); |
Trond Myklebust | 8b23ea7 | 2006-06-09 09:34:21 -0400 | [diff] [blame] | 804 | /* |
| 805 | * Position current pointer at beginning of tail, and |
| 806 | * set remaining message length. |
| 807 | */ |
Trond Myklebust | f8bb7f0 | 2012-06-21 14:53:10 -0400 | [diff] [blame] | 808 | if (len != 0) |
| 809 | xdr_set_page_base(xdr, 0, len); |
Trond Myklebust | 8b23ea7 | 2006-06-09 09:34:21 -0400 | [diff] [blame] | 810 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 811 | EXPORT_SYMBOL_GPL(xdr_enter_page); |
Trond Myklebust | 8b23ea7 | 2006-06-09 09:34:21 -0400 | [diff] [blame] | 812 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | static struct kvec empty_iov = {.iov_base = NULL, .iov_len = 0}; |
| 814 | |
| 815 | void |
| 816 | xdr_buf_from_iov(struct kvec *iov, struct xdr_buf *buf) |
| 817 | { |
| 818 | buf->head[0] = *iov; |
| 819 | buf->tail[0] = empty_iov; |
| 820 | buf->page_len = 0; |
| 821 | buf->buflen = buf->len = iov->iov_len; |
| 822 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 823 | EXPORT_SYMBOL_GPL(xdr_buf_from_iov); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | /* Sets subbuf to the portion of buf of length len beginning base bytes |
| 826 | * from the start of buf. Returns -1 if base of length are out of bounds. */ |
| 827 | int |
| 828 | xdr_buf_subsegment(struct xdr_buf *buf, struct xdr_buf *subbuf, |
Trond Myklebust | 1e78957 | 2006-08-31 15:09:19 -0400 | [diff] [blame] | 829 | unsigned int base, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | subbuf->buflen = subbuf->len = len; |
Trond Myklebust | 1e78957 | 2006-08-31 15:09:19 -0400 | [diff] [blame] | 832 | if (base < buf->head[0].iov_len) { |
| 833 | subbuf->head[0].iov_base = buf->head[0].iov_base + base; |
| 834 | subbuf->head[0].iov_len = min_t(unsigned int, len, |
| 835 | buf->head[0].iov_len - base); |
| 836 | len -= subbuf->head[0].iov_len; |
| 837 | base = 0; |
| 838 | } else { |
| 839 | subbuf->head[0].iov_base = NULL; |
| 840 | subbuf->head[0].iov_len = 0; |
| 841 | base -= buf->head[0].iov_len; |
| 842 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | |
| 844 | if (base < buf->page_len) { |
Trond Myklebust | 1e78957 | 2006-08-31 15:09:19 -0400 | [diff] [blame] | 845 | subbuf->page_len = min(buf->page_len - base, len); |
| 846 | base += buf->page_base; |
| 847 | subbuf->page_base = base & ~PAGE_CACHE_MASK; |
| 848 | subbuf->pages = &buf->pages[base >> PAGE_CACHE_SHIFT]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | len -= subbuf->page_len; |
| 850 | base = 0; |
| 851 | } else { |
| 852 | base -= buf->page_len; |
| 853 | subbuf->page_len = 0; |
| 854 | } |
| 855 | |
Trond Myklebust | 1e78957 | 2006-08-31 15:09:19 -0400 | [diff] [blame] | 856 | if (base < buf->tail[0].iov_len) { |
| 857 | subbuf->tail[0].iov_base = buf->tail[0].iov_base + base; |
| 858 | subbuf->tail[0].iov_len = min_t(unsigned int, len, |
| 859 | buf->tail[0].iov_len - base); |
| 860 | len -= subbuf->tail[0].iov_len; |
| 861 | base = 0; |
| 862 | } else { |
| 863 | subbuf->tail[0].iov_base = NULL; |
| 864 | subbuf->tail[0].iov_len = 0; |
| 865 | base -= buf->tail[0].iov_len; |
| 866 | } |
| 867 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | if (base || len) |
| 869 | return -1; |
| 870 | return 0; |
| 871 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 872 | EXPORT_SYMBOL_GPL(xdr_buf_subsegment); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | |
Trond Myklebust | 4e3e43a | 2006-10-17 13:47:24 -0400 | [diff] [blame] | 874 | static void __read_bytes_from_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | { |
Trond Myklebust | 1e78957 | 2006-08-31 15:09:19 -0400 | [diff] [blame] | 876 | unsigned int this_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | |
Trond Myklebust | 4e3e43a | 2006-10-17 13:47:24 -0400 | [diff] [blame] | 878 | this_len = min_t(unsigned int, len, subbuf->head[0].iov_len); |
| 879 | memcpy(obj, subbuf->head[0].iov_base, this_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | len -= this_len; |
| 881 | obj += this_len; |
Trond Myklebust | 4e3e43a | 2006-10-17 13:47:24 -0400 | [diff] [blame] | 882 | this_len = min_t(unsigned int, len, subbuf->page_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | if (this_len) |
Trond Myklebust | 4e3e43a | 2006-10-17 13:47:24 -0400 | [diff] [blame] | 884 | _copy_from_pages(obj, subbuf->pages, subbuf->page_base, this_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | len -= this_len; |
| 886 | obj += this_len; |
Trond Myklebust | 4e3e43a | 2006-10-17 13:47:24 -0400 | [diff] [blame] | 887 | this_len = min_t(unsigned int, len, subbuf->tail[0].iov_len); |
| 888 | memcpy(obj, subbuf->tail[0].iov_base, this_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | } |
| 890 | |
Andreas Gruenbacher | bd8100e | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 891 | /* obj is assumed to point to allocated memory of size at least len: */ |
Trond Myklebust | 4e3e43a | 2006-10-17 13:47:24 -0400 | [diff] [blame] | 892 | int read_bytes_from_xdr_buf(struct xdr_buf *buf, unsigned int base, void *obj, unsigned int len) |
Andreas Gruenbacher | bd8100e | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 893 | { |
| 894 | struct xdr_buf subbuf; |
Andreas Gruenbacher | bd8100e | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 895 | int status; |
| 896 | |
| 897 | status = xdr_buf_subsegment(buf, &subbuf, base, len); |
Trond Myklebust | 4e3e43a | 2006-10-17 13:47:24 -0400 | [diff] [blame] | 898 | if (status != 0) |
| 899 | return status; |
| 900 | __read_bytes_from_xdr_buf(&subbuf, obj, len); |
| 901 | return 0; |
| 902 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 903 | EXPORT_SYMBOL_GPL(read_bytes_from_xdr_buf); |
Trond Myklebust | 4e3e43a | 2006-10-17 13:47:24 -0400 | [diff] [blame] | 904 | |
| 905 | static void __write_bytes_to_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len) |
| 906 | { |
| 907 | unsigned int this_len; |
| 908 | |
| 909 | this_len = min_t(unsigned int, len, subbuf->head[0].iov_len); |
| 910 | memcpy(subbuf->head[0].iov_base, obj, this_len); |
Andreas Gruenbacher | bd8100e | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 911 | len -= this_len; |
| 912 | obj += this_len; |
Trond Myklebust | 4e3e43a | 2006-10-17 13:47:24 -0400 | [diff] [blame] | 913 | this_len = min_t(unsigned int, len, subbuf->page_len); |
Andreas Gruenbacher | bd8100e | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 914 | if (this_len) |
Trond Myklebust | 4e3e43a | 2006-10-17 13:47:24 -0400 | [diff] [blame] | 915 | _copy_to_pages(subbuf->pages, subbuf->page_base, obj, this_len); |
Andreas Gruenbacher | bd8100e | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 916 | len -= this_len; |
| 917 | obj += this_len; |
Trond Myklebust | 4e3e43a | 2006-10-17 13:47:24 -0400 | [diff] [blame] | 918 | this_len = min_t(unsigned int, len, subbuf->tail[0].iov_len); |
| 919 | memcpy(subbuf->tail[0].iov_base, obj, this_len); |
| 920 | } |
| 921 | |
| 922 | /* obj is assumed to point to allocated memory of size at least len: */ |
| 923 | int write_bytes_to_xdr_buf(struct xdr_buf *buf, unsigned int base, void *obj, unsigned int len) |
| 924 | { |
| 925 | struct xdr_buf subbuf; |
| 926 | int status; |
| 927 | |
| 928 | status = xdr_buf_subsegment(buf, &subbuf, base, len); |
| 929 | if (status != 0) |
| 930 | return status; |
| 931 | __write_bytes_to_xdr_buf(&subbuf, obj, len); |
| 932 | return 0; |
Andreas Gruenbacher | bd8100e | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 933 | } |
Kevin Coffman | c43abae | 2010-03-17 13:02:58 -0400 | [diff] [blame] | 934 | EXPORT_SYMBOL_GPL(write_bytes_to_xdr_buf); |
Andreas Gruenbacher | bd8100e | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 935 | |
| 936 | int |
Trond Myklebust | 1e78957 | 2006-08-31 15:09:19 -0400 | [diff] [blame] | 937 | xdr_decode_word(struct xdr_buf *buf, unsigned int base, u32 *obj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | { |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 939 | __be32 raw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | int status; |
| 941 | |
| 942 | status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); |
| 943 | if (status) |
| 944 | return status; |
Benny Halevy | 98866b5 | 2009-08-14 17:18:49 +0300 | [diff] [blame] | 945 | *obj = be32_to_cpu(raw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | return 0; |
| 947 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 948 | EXPORT_SYMBOL_GPL(xdr_decode_word); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | |
Andreas Gruenbacher | bd8100e | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 950 | int |
Trond Myklebust | 1e78957 | 2006-08-31 15:09:19 -0400 | [diff] [blame] | 951 | xdr_encode_word(struct xdr_buf *buf, unsigned int base, u32 obj) |
Andreas Gruenbacher | bd8100e | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 952 | { |
Benny Halevy | 9f162d2 | 2009-08-14 17:18:44 +0300 | [diff] [blame] | 953 | __be32 raw = cpu_to_be32(obj); |
Andreas Gruenbacher | bd8100e | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 954 | |
| 955 | return write_bytes_to_xdr_buf(buf, base, &raw, sizeof(obj)); |
| 956 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 957 | EXPORT_SYMBOL_GPL(xdr_encode_word); |
Andreas Gruenbacher | bd8100e | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 958 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | /* If the netobj starting offset bytes from the start of xdr_buf is contained |
| 960 | * entirely in the head or the tail, set object to point to it; otherwise |
| 961 | * try to find space for it at the end of the tail, copy it there, and |
| 962 | * set obj to point to it. */ |
Trond Myklebust | bee57c9 | 2006-10-09 22:08:22 -0400 | [diff] [blame] | 963 | int xdr_buf_read_netobj(struct xdr_buf *buf, struct xdr_netobj *obj, unsigned int offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | { |
Trond Myklebust | bee57c9 | 2006-10-09 22:08:22 -0400 | [diff] [blame] | 965 | struct xdr_buf subbuf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | |
Andreas Gruenbacher | bd8100e | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 967 | if (xdr_decode_word(buf, offset, &obj->len)) |
Trond Myklebust | bee57c9 | 2006-10-09 22:08:22 -0400 | [diff] [blame] | 968 | return -EFAULT; |
| 969 | if (xdr_buf_subsegment(buf, &subbuf, offset + 4, obj->len)) |
| 970 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | |
Trond Myklebust | bee57c9 | 2006-10-09 22:08:22 -0400 | [diff] [blame] | 972 | /* Is the obj contained entirely in the head? */ |
| 973 | obj->data = subbuf.head[0].iov_base; |
| 974 | if (subbuf.head[0].iov_len == obj->len) |
| 975 | return 0; |
| 976 | /* ..or is the obj contained entirely in the tail? */ |
| 977 | obj->data = subbuf.tail[0].iov_base; |
| 978 | if (subbuf.tail[0].iov_len == obj->len) |
| 979 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | |
Trond Myklebust | bee57c9 | 2006-10-09 22:08:22 -0400 | [diff] [blame] | 981 | /* use end of tail as storage for obj: |
| 982 | * (We don't copy to the beginning because then we'd have |
| 983 | * to worry about doing a potentially overlapping copy. |
| 984 | * This assumes the object is at most half the length of the |
| 985 | * tail.) */ |
| 986 | if (obj->len > buf->buflen - buf->len) |
| 987 | return -ENOMEM; |
| 988 | if (buf->tail[0].iov_len != 0) |
| 989 | obj->data = buf->tail[0].iov_base + buf->tail[0].iov_len; |
| 990 | else |
| 991 | obj->data = buf->head[0].iov_base + buf->head[0].iov_len; |
| 992 | __read_bytes_from_xdr_buf(&subbuf, obj->data, obj->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 995 | EXPORT_SYMBOL_GPL(xdr_buf_read_netobj); |
Andreas Gruenbacher | bd8100e | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 996 | |
| 997 | /* Returns 0 on success, or else a negative error code. */ |
| 998 | static int |
| 999 | xdr_xcode_array2(struct xdr_buf *buf, unsigned int base, |
| 1000 | struct xdr_array2_desc *desc, int encode) |
| 1001 | { |
| 1002 | char *elem = NULL, *c; |
| 1003 | unsigned int copied = 0, todo, avail_here; |
| 1004 | struct page **ppages = NULL; |
| 1005 | int err; |
| 1006 | |
| 1007 | if (encode) { |
| 1008 | if (xdr_encode_word(buf, base, desc->array_len) != 0) |
| 1009 | return -EINVAL; |
| 1010 | } else { |
| 1011 | if (xdr_decode_word(buf, base, &desc->array_len) != 0 || |
Trond Myklebust | 58fcb8d | 2005-08-10 18:15:12 -0400 | [diff] [blame] | 1012 | desc->array_len > desc->array_maxlen || |
Andreas Gruenbacher | bd8100e | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 1013 | (unsigned long) base + 4 + desc->array_len * |
| 1014 | desc->elem_size > buf->len) |
| 1015 | return -EINVAL; |
| 1016 | } |
| 1017 | base += 4; |
| 1018 | |
| 1019 | if (!desc->xcode) |
| 1020 | return 0; |
| 1021 | |
| 1022 | todo = desc->array_len * desc->elem_size; |
| 1023 | |
| 1024 | /* process head */ |
| 1025 | if (todo && base < buf->head->iov_len) { |
| 1026 | c = buf->head->iov_base + base; |
| 1027 | avail_here = min_t(unsigned int, todo, |
| 1028 | buf->head->iov_len - base); |
| 1029 | todo -= avail_here; |
| 1030 | |
| 1031 | while (avail_here >= desc->elem_size) { |
| 1032 | err = desc->xcode(desc, c); |
| 1033 | if (err) |
| 1034 | goto out; |
| 1035 | c += desc->elem_size; |
| 1036 | avail_here -= desc->elem_size; |
| 1037 | } |
| 1038 | if (avail_here) { |
| 1039 | if (!elem) { |
| 1040 | elem = kmalloc(desc->elem_size, GFP_KERNEL); |
| 1041 | err = -ENOMEM; |
| 1042 | if (!elem) |
| 1043 | goto out; |
| 1044 | } |
| 1045 | if (encode) { |
| 1046 | err = desc->xcode(desc, elem); |
| 1047 | if (err) |
| 1048 | goto out; |
| 1049 | memcpy(c, elem, avail_here); |
| 1050 | } else |
| 1051 | memcpy(elem, c, avail_here); |
| 1052 | copied = avail_here; |
| 1053 | } |
| 1054 | base = buf->head->iov_len; /* align to start of pages */ |
| 1055 | } |
| 1056 | |
| 1057 | /* process pages array */ |
| 1058 | base -= buf->head->iov_len; |
| 1059 | if (todo && base < buf->page_len) { |
| 1060 | unsigned int avail_page; |
| 1061 | |
| 1062 | avail_here = min(todo, buf->page_len - base); |
| 1063 | todo -= avail_here; |
| 1064 | |
| 1065 | base += buf->page_base; |
| 1066 | ppages = buf->pages + (base >> PAGE_CACHE_SHIFT); |
| 1067 | base &= ~PAGE_CACHE_MASK; |
| 1068 | avail_page = min_t(unsigned int, PAGE_CACHE_SIZE - base, |
| 1069 | avail_here); |
| 1070 | c = kmap(*ppages) + base; |
| 1071 | |
| 1072 | while (avail_here) { |
| 1073 | avail_here -= avail_page; |
| 1074 | if (copied || avail_page < desc->elem_size) { |
| 1075 | unsigned int l = min(avail_page, |
| 1076 | desc->elem_size - copied); |
| 1077 | if (!elem) { |
| 1078 | elem = kmalloc(desc->elem_size, |
| 1079 | GFP_KERNEL); |
| 1080 | err = -ENOMEM; |
| 1081 | if (!elem) |
| 1082 | goto out; |
| 1083 | } |
| 1084 | if (encode) { |
| 1085 | if (!copied) { |
| 1086 | err = desc->xcode(desc, elem); |
| 1087 | if (err) |
| 1088 | goto out; |
| 1089 | } |
| 1090 | memcpy(c, elem + copied, l); |
| 1091 | copied += l; |
| 1092 | if (copied == desc->elem_size) |
| 1093 | copied = 0; |
| 1094 | } else { |
| 1095 | memcpy(elem + copied, c, l); |
| 1096 | copied += l; |
| 1097 | if (copied == desc->elem_size) { |
| 1098 | err = desc->xcode(desc, elem); |
| 1099 | if (err) |
| 1100 | goto out; |
| 1101 | copied = 0; |
| 1102 | } |
| 1103 | } |
| 1104 | avail_page -= l; |
| 1105 | c += l; |
| 1106 | } |
| 1107 | while (avail_page >= desc->elem_size) { |
| 1108 | err = desc->xcode(desc, c); |
| 1109 | if (err) |
| 1110 | goto out; |
| 1111 | c += desc->elem_size; |
| 1112 | avail_page -= desc->elem_size; |
| 1113 | } |
| 1114 | if (avail_page) { |
| 1115 | unsigned int l = min(avail_page, |
| 1116 | desc->elem_size - copied); |
| 1117 | if (!elem) { |
| 1118 | elem = kmalloc(desc->elem_size, |
| 1119 | GFP_KERNEL); |
| 1120 | err = -ENOMEM; |
| 1121 | if (!elem) |
| 1122 | goto out; |
| 1123 | } |
| 1124 | if (encode) { |
| 1125 | if (!copied) { |
| 1126 | err = desc->xcode(desc, elem); |
| 1127 | if (err) |
| 1128 | goto out; |
| 1129 | } |
| 1130 | memcpy(c, elem + copied, l); |
| 1131 | copied += l; |
| 1132 | if (copied == desc->elem_size) |
| 1133 | copied = 0; |
| 1134 | } else { |
| 1135 | memcpy(elem + copied, c, l); |
| 1136 | copied += l; |
| 1137 | if (copied == desc->elem_size) { |
| 1138 | err = desc->xcode(desc, elem); |
| 1139 | if (err) |
| 1140 | goto out; |
| 1141 | copied = 0; |
| 1142 | } |
| 1143 | } |
| 1144 | } |
| 1145 | if (avail_here) { |
| 1146 | kunmap(*ppages); |
| 1147 | ppages++; |
| 1148 | c = kmap(*ppages); |
| 1149 | } |
| 1150 | |
| 1151 | avail_page = min(avail_here, |
| 1152 | (unsigned int) PAGE_CACHE_SIZE); |
| 1153 | } |
| 1154 | base = buf->page_len; /* align to start of tail */ |
| 1155 | } |
| 1156 | |
| 1157 | /* process tail */ |
| 1158 | base -= buf->page_len; |
| 1159 | if (todo) { |
| 1160 | c = buf->tail->iov_base + base; |
| 1161 | if (copied) { |
| 1162 | unsigned int l = desc->elem_size - copied; |
| 1163 | |
| 1164 | if (encode) |
| 1165 | memcpy(c, elem + copied, l); |
| 1166 | else { |
| 1167 | memcpy(elem + copied, c, l); |
| 1168 | err = desc->xcode(desc, elem); |
| 1169 | if (err) |
| 1170 | goto out; |
| 1171 | } |
| 1172 | todo -= l; |
| 1173 | c += l; |
| 1174 | } |
| 1175 | while (todo) { |
| 1176 | err = desc->xcode(desc, c); |
| 1177 | if (err) |
| 1178 | goto out; |
| 1179 | c += desc->elem_size; |
| 1180 | todo -= desc->elem_size; |
| 1181 | } |
| 1182 | } |
| 1183 | err = 0; |
| 1184 | |
| 1185 | out: |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 1186 | kfree(elem); |
Andreas Gruenbacher | bd8100e | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 1187 | if (ppages) |
| 1188 | kunmap(*ppages); |
| 1189 | return err; |
| 1190 | } |
| 1191 | |
| 1192 | int |
| 1193 | xdr_decode_array2(struct xdr_buf *buf, unsigned int base, |
| 1194 | struct xdr_array2_desc *desc) |
| 1195 | { |
| 1196 | if (base >= buf->len) |
| 1197 | return -EINVAL; |
| 1198 | |
| 1199 | return xdr_xcode_array2(buf, base, desc, 0); |
| 1200 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 1201 | EXPORT_SYMBOL_GPL(xdr_decode_array2); |
Andreas Gruenbacher | bd8100e | 2005-06-22 17:16:24 +0000 | [diff] [blame] | 1202 | |
| 1203 | int |
| 1204 | xdr_encode_array2(struct xdr_buf *buf, unsigned int base, |
| 1205 | struct xdr_array2_desc *desc) |
| 1206 | { |
| 1207 | if ((unsigned long) base + 4 + desc->array_len * desc->elem_size > |
| 1208 | buf->head->iov_len + buf->page_len + buf->tail->iov_len) |
| 1209 | return -EINVAL; |
| 1210 | |
| 1211 | return xdr_xcode_array2(buf, base, desc, 1); |
| 1212 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 1213 | EXPORT_SYMBOL_GPL(xdr_encode_array2); |
Olga Kornievskaia | 37a4e6c | 2006-12-04 20:22:33 -0500 | [diff] [blame] | 1214 | |
| 1215 | int |
| 1216 | xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 1217 | int (*actor)(struct scatterlist *, void *), void *data) |
Olga Kornievskaia | 37a4e6c | 2006-12-04 20:22:33 -0500 | [diff] [blame] | 1218 | { |
| 1219 | int i, ret = 0; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1220 | unsigned int page_len, thislen, page_offset; |
Olga Kornievskaia | 37a4e6c | 2006-12-04 20:22:33 -0500 | [diff] [blame] | 1221 | struct scatterlist sg[1]; |
| 1222 | |
Herbert Xu | 68e3f5d | 2007-10-27 00:52:07 -0700 | [diff] [blame] | 1223 | sg_init_table(sg, 1); |
| 1224 | |
Olga Kornievskaia | 37a4e6c | 2006-12-04 20:22:33 -0500 | [diff] [blame] | 1225 | if (offset >= buf->head[0].iov_len) { |
| 1226 | offset -= buf->head[0].iov_len; |
| 1227 | } else { |
| 1228 | thislen = buf->head[0].iov_len - offset; |
| 1229 | if (thislen > len) |
| 1230 | thislen = len; |
| 1231 | sg_set_buf(sg, buf->head[0].iov_base + offset, thislen); |
| 1232 | ret = actor(sg, data); |
| 1233 | if (ret) |
| 1234 | goto out; |
| 1235 | offset = 0; |
| 1236 | len -= thislen; |
| 1237 | } |
| 1238 | if (len == 0) |
| 1239 | goto out; |
| 1240 | |
| 1241 | if (offset >= buf->page_len) { |
| 1242 | offset -= buf->page_len; |
| 1243 | } else { |
| 1244 | page_len = buf->page_len - offset; |
| 1245 | if (page_len > len) |
| 1246 | page_len = len; |
| 1247 | len -= page_len; |
| 1248 | page_offset = (offset + buf->page_base) & (PAGE_CACHE_SIZE - 1); |
| 1249 | i = (offset + buf->page_base) >> PAGE_CACHE_SHIFT; |
| 1250 | thislen = PAGE_CACHE_SIZE - page_offset; |
| 1251 | do { |
| 1252 | if (thislen > page_len) |
| 1253 | thislen = page_len; |
Jens Axboe | 642f14903 | 2007-10-24 11:20:47 +0200 | [diff] [blame] | 1254 | sg_set_page(sg, buf->pages[i], thislen, page_offset); |
Olga Kornievskaia | 37a4e6c | 2006-12-04 20:22:33 -0500 | [diff] [blame] | 1255 | ret = actor(sg, data); |
| 1256 | if (ret) |
| 1257 | goto out; |
| 1258 | page_len -= thislen; |
| 1259 | i++; |
| 1260 | page_offset = 0; |
| 1261 | thislen = PAGE_CACHE_SIZE; |
| 1262 | } while (page_len != 0); |
| 1263 | offset = 0; |
| 1264 | } |
| 1265 | if (len == 0) |
| 1266 | goto out; |
| 1267 | if (offset < buf->tail[0].iov_len) { |
| 1268 | thislen = buf->tail[0].iov_len - offset; |
| 1269 | if (thislen > len) |
| 1270 | thislen = len; |
| 1271 | sg_set_buf(sg, buf->tail[0].iov_base + offset, thislen); |
| 1272 | ret = actor(sg, data); |
| 1273 | len -= thislen; |
| 1274 | } |
| 1275 | if (len != 0) |
| 1276 | ret = -EINVAL; |
| 1277 | out: |
| 1278 | return ret; |
| 1279 | } |
Trond Myklebust | 468039e | 2008-12-23 15:21:31 -0500 | [diff] [blame] | 1280 | EXPORT_SYMBOL_GPL(xdr_process_buf); |
Olga Kornievskaia | 37a4e6c | 2006-12-04 20:22:33 -0500 | [diff] [blame] | 1281 | |