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![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
1111 lines
27 KiB
C
1111 lines
27 KiB
C
/*
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* linux/net/sunrpc/xdr.c
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*
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* Generic XDR support.
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*
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* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/pagemap.h>
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#include <linux/errno.h>
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#include <linux/sunrpc/xdr.h>
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#include <linux/sunrpc/msg_prot.h>
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/*
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* XDR functions for basic NFS types
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*/
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__be32 *
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xdr_encode_netobj(__be32 *p, const struct xdr_netobj *obj)
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{
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unsigned int quadlen = XDR_QUADLEN(obj->len);
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p[quadlen] = 0; /* zero trailing bytes */
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*p++ = cpu_to_be32(obj->len);
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memcpy(p, obj->data, obj->len);
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return p + XDR_QUADLEN(obj->len);
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}
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EXPORT_SYMBOL_GPL(xdr_encode_netobj);
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__be32 *
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xdr_decode_netobj(__be32 *p, struct xdr_netobj *obj)
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{
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unsigned int len;
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if ((len = be32_to_cpu(*p++)) > XDR_MAX_NETOBJ)
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return NULL;
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obj->len = len;
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obj->data = (u8 *) p;
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return p + XDR_QUADLEN(len);
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}
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EXPORT_SYMBOL_GPL(xdr_decode_netobj);
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/**
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* xdr_encode_opaque_fixed - Encode fixed length opaque data
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* @p: pointer to current position in XDR buffer.
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* @ptr: pointer to data to encode (or NULL)
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* @nbytes: size of data.
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*
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* Copy the array of data of length nbytes at ptr to the XDR buffer
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* at position p, then align to the next 32-bit boundary by padding
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* with zero bytes (see RFC1832).
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* Note: if ptr is NULL, only the padding is performed.
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*
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* Returns the updated current XDR buffer position
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*
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*/
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__be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int nbytes)
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{
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if (likely(nbytes != 0)) {
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unsigned int quadlen = XDR_QUADLEN(nbytes);
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unsigned int padding = (quadlen << 2) - nbytes;
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if (ptr != NULL)
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memcpy(p, ptr, nbytes);
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if (padding != 0)
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memset((char *)p + nbytes, 0, padding);
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p += quadlen;
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}
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return p;
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}
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EXPORT_SYMBOL_GPL(xdr_encode_opaque_fixed);
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/**
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* xdr_encode_opaque - Encode variable length opaque data
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* @p: pointer to current position in XDR buffer.
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* @ptr: pointer to data to encode (or NULL)
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* @nbytes: size of data.
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*
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* Returns the updated current XDR buffer position
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*/
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__be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int nbytes)
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{
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*p++ = cpu_to_be32(nbytes);
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return xdr_encode_opaque_fixed(p, ptr, nbytes);
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}
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EXPORT_SYMBOL_GPL(xdr_encode_opaque);
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__be32 *
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xdr_encode_string(__be32 *p, const char *string)
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{
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return xdr_encode_array(p, string, strlen(string));
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}
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EXPORT_SYMBOL_GPL(xdr_encode_string);
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__be32 *
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xdr_decode_string_inplace(__be32 *p, char **sp,
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unsigned int *lenp, unsigned int maxlen)
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{
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u32 len;
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len = be32_to_cpu(*p++);
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if (len > maxlen)
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return NULL;
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*lenp = len;
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*sp = (char *) p;
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return p + XDR_QUADLEN(len);
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}
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EXPORT_SYMBOL_GPL(xdr_decode_string_inplace);
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void
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xdr_encode_pages(struct xdr_buf *xdr, struct page **pages, unsigned int base,
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unsigned int len)
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{
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struct kvec *tail = xdr->tail;
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u32 *p;
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xdr->pages = pages;
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xdr->page_base = base;
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xdr->page_len = len;
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p = (u32 *)xdr->head[0].iov_base + XDR_QUADLEN(xdr->head[0].iov_len);
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tail->iov_base = p;
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tail->iov_len = 0;
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if (len & 3) {
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unsigned int pad = 4 - (len & 3);
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*p = 0;
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tail->iov_base = (char *)p + (len & 3);
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tail->iov_len = pad;
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len += pad;
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}
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xdr->buflen += len;
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xdr->len += len;
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}
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EXPORT_SYMBOL_GPL(xdr_encode_pages);
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void
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xdr_inline_pages(struct xdr_buf *xdr, unsigned int offset,
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struct page **pages, unsigned int base, unsigned int len)
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{
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struct kvec *head = xdr->head;
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struct kvec *tail = xdr->tail;
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char *buf = (char *)head->iov_base;
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unsigned int buflen = head->iov_len;
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head->iov_len = offset;
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xdr->pages = pages;
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xdr->page_base = base;
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xdr->page_len = len;
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tail->iov_base = buf + offset;
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tail->iov_len = buflen - offset;
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xdr->buflen += len;
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}
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EXPORT_SYMBOL_GPL(xdr_inline_pages);
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/*
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* Helper routines for doing 'memmove' like operations on a struct xdr_buf
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*
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* _shift_data_right_pages
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* @pages: vector of pages containing both the source and dest memory area.
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* @pgto_base: page vector address of destination
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* @pgfrom_base: page vector address of source
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* @len: number of bytes to copy
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*
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* Note: the addresses pgto_base and pgfrom_base are both calculated in
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* the same way:
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* if a memory area starts at byte 'base' in page 'pages[i]',
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* then its address is given as (i << PAGE_CACHE_SHIFT) + base
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* Also note: pgfrom_base must be < pgto_base, but the memory areas
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* they point to may overlap.
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*/
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static void
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_shift_data_right_pages(struct page **pages, size_t pgto_base,
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size_t pgfrom_base, size_t len)
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{
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struct page **pgfrom, **pgto;
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char *vfrom, *vto;
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size_t copy;
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BUG_ON(pgto_base <= pgfrom_base);
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pgto_base += len;
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pgfrom_base += len;
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pgto = pages + (pgto_base >> PAGE_CACHE_SHIFT);
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pgfrom = pages + (pgfrom_base >> PAGE_CACHE_SHIFT);
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pgto_base &= ~PAGE_CACHE_MASK;
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pgfrom_base &= ~PAGE_CACHE_MASK;
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do {
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/* Are any pointers crossing a page boundary? */
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if (pgto_base == 0) {
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pgto_base = PAGE_CACHE_SIZE;
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pgto--;
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}
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if (pgfrom_base == 0) {
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pgfrom_base = PAGE_CACHE_SIZE;
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pgfrom--;
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}
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copy = len;
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if (copy > pgto_base)
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copy = pgto_base;
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if (copy > pgfrom_base)
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copy = pgfrom_base;
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pgto_base -= copy;
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pgfrom_base -= copy;
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vto = kmap_atomic(*pgto, KM_USER0);
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vfrom = kmap_atomic(*pgfrom, KM_USER1);
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memmove(vto + pgto_base, vfrom + pgfrom_base, copy);
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flush_dcache_page(*pgto);
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kunmap_atomic(vfrom, KM_USER1);
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kunmap_atomic(vto, KM_USER0);
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} while ((len -= copy) != 0);
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}
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/*
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* _copy_to_pages
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* @pages: array of pages
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* @pgbase: page vector address of destination
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* @p: pointer to source data
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* @len: length
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*
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* Copies data from an arbitrary memory location into an array of pages
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* The copy is assumed to be non-overlapping.
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*/
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static void
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_copy_to_pages(struct page **pages, size_t pgbase, const char *p, size_t len)
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{
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struct page **pgto;
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char *vto;
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size_t copy;
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pgto = pages + (pgbase >> PAGE_CACHE_SHIFT);
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pgbase &= ~PAGE_CACHE_MASK;
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for (;;) {
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copy = PAGE_CACHE_SIZE - pgbase;
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if (copy > len)
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copy = len;
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vto = kmap_atomic(*pgto, KM_USER0);
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memcpy(vto + pgbase, p, copy);
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kunmap_atomic(vto, KM_USER0);
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len -= copy;
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if (len == 0)
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break;
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pgbase += copy;
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if (pgbase == PAGE_CACHE_SIZE) {
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flush_dcache_page(*pgto);
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pgbase = 0;
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pgto++;
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}
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p += copy;
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}
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flush_dcache_page(*pgto);
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}
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/*
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* _copy_from_pages
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* @p: pointer to destination
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* @pages: array of pages
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* @pgbase: offset of source data
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* @len: length
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*
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* Copies data into an arbitrary memory location from an array of pages
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* The copy is assumed to be non-overlapping.
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*/
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static void
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_copy_from_pages(char *p, struct page **pages, size_t pgbase, size_t len)
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{
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struct page **pgfrom;
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char *vfrom;
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size_t copy;
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pgfrom = pages + (pgbase >> PAGE_CACHE_SHIFT);
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pgbase &= ~PAGE_CACHE_MASK;
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do {
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copy = PAGE_CACHE_SIZE - pgbase;
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if (copy > len)
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copy = len;
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vfrom = kmap_atomic(*pgfrom, KM_USER0);
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memcpy(p, vfrom + pgbase, copy);
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kunmap_atomic(vfrom, KM_USER0);
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pgbase += copy;
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if (pgbase == PAGE_CACHE_SIZE) {
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pgbase = 0;
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pgfrom++;
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}
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p += copy;
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} while ((len -= copy) != 0);
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}
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/*
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* xdr_shrink_bufhead
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* @buf: xdr_buf
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* @len: bytes to remove from buf->head[0]
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*
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* Shrinks XDR buffer's header kvec buf->head[0] by
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* 'len' bytes. The extra data is not lost, but is instead
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* moved into the inlined pages and/or the tail.
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*/
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static void
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xdr_shrink_bufhead(struct xdr_buf *buf, size_t len)
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{
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struct kvec *head, *tail;
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size_t copy, offs;
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unsigned int pglen = buf->page_len;
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tail = buf->tail;
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head = buf->head;
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BUG_ON (len > head->iov_len);
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/* Shift the tail first */
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if (tail->iov_len != 0) {
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if (tail->iov_len > len) {
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copy = tail->iov_len - len;
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memmove((char *)tail->iov_base + len,
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tail->iov_base, copy);
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}
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/* Copy from the inlined pages into the tail */
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copy = len;
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if (copy > pglen)
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copy = pglen;
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offs = len - copy;
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if (offs >= tail->iov_len)
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copy = 0;
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else if (copy > tail->iov_len - offs)
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copy = tail->iov_len - offs;
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if (copy != 0)
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_copy_from_pages((char *)tail->iov_base + offs,
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buf->pages,
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buf->page_base + pglen + offs - len,
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copy);
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/* Do we also need to copy data from the head into the tail ? */
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if (len > pglen) {
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offs = copy = len - pglen;
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if (copy > tail->iov_len)
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copy = tail->iov_len;
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memcpy(tail->iov_base,
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(char *)head->iov_base +
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head->iov_len - offs,
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copy);
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}
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}
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/* Now handle pages */
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if (pglen != 0) {
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if (pglen > len)
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_shift_data_right_pages(buf->pages,
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buf->page_base + len,
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buf->page_base,
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pglen - len);
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copy = len;
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if (len > pglen)
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copy = pglen;
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_copy_to_pages(buf->pages, buf->page_base,
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(char *)head->iov_base + head->iov_len - len,
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copy);
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}
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head->iov_len -= len;
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buf->buflen -= len;
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/* Have we truncated the message? */
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if (buf->len > buf->buflen)
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buf->len = buf->buflen;
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}
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/*
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* xdr_shrink_pagelen
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* @buf: xdr_buf
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* @len: bytes to remove from buf->pages
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*
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* Shrinks XDR buffer's page array buf->pages by
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* 'len' bytes. The extra data is not lost, but is instead
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* moved into the tail.
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*/
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static void
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xdr_shrink_pagelen(struct xdr_buf *buf, size_t len)
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{
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struct kvec *tail;
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size_t copy;
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char *p;
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unsigned int pglen = buf->page_len;
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tail = buf->tail;
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BUG_ON (len > pglen);
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/* Shift the tail first */
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if (tail->iov_len != 0) {
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p = (char *)tail->iov_base + len;
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if (tail->iov_len > len) {
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copy = tail->iov_len - len;
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memmove(p, tail->iov_base, copy);
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} else
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buf->buflen -= len;
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/* Copy from the inlined pages into the tail */
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copy = len;
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if (copy > tail->iov_len)
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copy = tail->iov_len;
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_copy_from_pages((char *)tail->iov_base,
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buf->pages, buf->page_base + pglen - len,
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copy);
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}
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buf->page_len -= len;
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buf->buflen -= len;
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/* Have we truncated the message? */
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if (buf->len > buf->buflen)
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buf->len = buf->buflen;
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}
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void
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xdr_shift_buf(struct xdr_buf *buf, size_t len)
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{
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xdr_shrink_bufhead(buf, len);
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}
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EXPORT_SYMBOL_GPL(xdr_shift_buf);
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/**
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* xdr_init_encode - Initialize a struct xdr_stream for sending data.
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* @xdr: pointer to xdr_stream struct
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* @buf: pointer to XDR buffer in which to encode data
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* @p: current pointer inside XDR buffer
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*
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* Note: at the moment the RPC client only passes the length of our
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* scratch buffer in the xdr_buf's header kvec. Previously this
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* meant we needed to call xdr_adjust_iovec() after encoding the
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* data. With the new scheme, the xdr_stream manages the details
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* of the buffer length, and takes care of adjusting the kvec
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* length for us.
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*/
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void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p)
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{
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struct kvec *iov = buf->head;
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int scratch_len = buf->buflen - buf->page_len - buf->tail[0].iov_len;
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BUG_ON(scratch_len < 0);
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xdr->buf = buf;
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xdr->iov = iov;
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xdr->p = (__be32 *)((char *)iov->iov_base + iov->iov_len);
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xdr->end = (__be32 *)((char *)iov->iov_base + scratch_len);
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BUG_ON(iov->iov_len > scratch_len);
|
|
|
|
if (p != xdr->p && p != NULL) {
|
|
size_t len;
|
|
|
|
BUG_ON(p < xdr->p || p > xdr->end);
|
|
len = (char *)p - (char *)xdr->p;
|
|
xdr->p = p;
|
|
buf->len += len;
|
|
iov->iov_len += len;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(xdr_init_encode);
|
|
|
|
/**
|
|
* xdr_reserve_space - Reserve buffer space for sending
|
|
* @xdr: pointer to xdr_stream
|
|
* @nbytes: number of bytes to reserve
|
|
*
|
|
* Checks that we have enough buffer space to encode 'nbytes' more
|
|
* bytes of data. If so, update the total xdr_buf length, and
|
|
* adjust the length of the current kvec.
|
|
*/
|
|
__be32 * xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes)
|
|
{
|
|
__be32 *p = xdr->p;
|
|
__be32 *q;
|
|
|
|
/* align nbytes on the next 32-bit boundary */
|
|
nbytes += 3;
|
|
nbytes &= ~3;
|
|
q = p + (nbytes >> 2);
|
|
if (unlikely(q > xdr->end || q < p))
|
|
return NULL;
|
|
xdr->p = q;
|
|
xdr->iov->iov_len += nbytes;
|
|
xdr->buf->len += nbytes;
|
|
return p;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xdr_reserve_space);
|
|
|
|
/**
|
|
* xdr_write_pages - Insert a list of pages into an XDR buffer for sending
|
|
* @xdr: pointer to xdr_stream
|
|
* @pages: list of pages
|
|
* @base: offset of first byte
|
|
* @len: length of data in bytes
|
|
*
|
|
*/
|
|
void xdr_write_pages(struct xdr_stream *xdr, struct page **pages, unsigned int base,
|
|
unsigned int len)
|
|
{
|
|
struct xdr_buf *buf = xdr->buf;
|
|
struct kvec *iov = buf->tail;
|
|
buf->pages = pages;
|
|
buf->page_base = base;
|
|
buf->page_len = len;
|
|
|
|
iov->iov_base = (char *)xdr->p;
|
|
iov->iov_len = 0;
|
|
xdr->iov = iov;
|
|
|
|
if (len & 3) {
|
|
unsigned int pad = 4 - (len & 3);
|
|
|
|
BUG_ON(xdr->p >= xdr->end);
|
|
iov->iov_base = (char *)xdr->p + (len & 3);
|
|
iov->iov_len += pad;
|
|
len += pad;
|
|
*xdr->p++ = 0;
|
|
}
|
|
buf->buflen += len;
|
|
buf->len += len;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xdr_write_pages);
|
|
|
|
/**
|
|
* xdr_init_decode - Initialize an xdr_stream for decoding data.
|
|
* @xdr: pointer to xdr_stream struct
|
|
* @buf: pointer to XDR buffer from which to decode data
|
|
* @p: current pointer inside XDR buffer
|
|
*/
|
|
void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p)
|
|
{
|
|
struct kvec *iov = buf->head;
|
|
unsigned int len = iov->iov_len;
|
|
|
|
if (len > buf->len)
|
|
len = buf->len;
|
|
xdr->buf = buf;
|
|
xdr->iov = iov;
|
|
xdr->p = p;
|
|
xdr->end = (__be32 *)((char *)iov->iov_base + len);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xdr_init_decode);
|
|
|
|
/**
|
|
* xdr_inline_decode - Retrieve non-page XDR data to decode
|
|
* @xdr: pointer to xdr_stream struct
|
|
* @nbytes: number of bytes of data to decode
|
|
*
|
|
* Check if the input buffer is long enough to enable us to decode
|
|
* 'nbytes' more bytes of data starting at the current position.
|
|
* If so return the current pointer, then update the current
|
|
* pointer position.
|
|
*/
|
|
__be32 * xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes)
|
|
{
|
|
__be32 *p = xdr->p;
|
|
__be32 *q = p + XDR_QUADLEN(nbytes);
|
|
|
|
if (unlikely(q > xdr->end || q < p))
|
|
return NULL;
|
|
xdr->p = q;
|
|
return p;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xdr_inline_decode);
|
|
|
|
/**
|
|
* xdr_read_pages - Ensure page-based XDR data to decode is aligned at current pointer position
|
|
* @xdr: pointer to xdr_stream struct
|
|
* @len: number of bytes of page data
|
|
*
|
|
* Moves data beyond the current pointer position from the XDR head[] buffer
|
|
* into the page list. Any data that lies beyond current position + "len"
|
|
* bytes is moved into the XDR tail[].
|
|
*/
|
|
void xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
|
|
{
|
|
struct xdr_buf *buf = xdr->buf;
|
|
struct kvec *iov;
|
|
ssize_t shift;
|
|
unsigned int end;
|
|
int padding;
|
|
|
|
/* Realign pages to current pointer position */
|
|
iov = buf->head;
|
|
shift = iov->iov_len + (char *)iov->iov_base - (char *)xdr->p;
|
|
if (shift > 0)
|
|
xdr_shrink_bufhead(buf, shift);
|
|
|
|
/* Truncate page data and move it into the tail */
|
|
if (buf->page_len > len)
|
|
xdr_shrink_pagelen(buf, buf->page_len - len);
|
|
padding = (XDR_QUADLEN(len) << 2) - len;
|
|
xdr->iov = iov = buf->tail;
|
|
/* Compute remaining message length. */
|
|
end = iov->iov_len;
|
|
shift = buf->buflen - buf->len;
|
|
if (shift < end)
|
|
end -= shift;
|
|
else if (shift > 0)
|
|
end = 0;
|
|
/*
|
|
* Position current pointer at beginning of tail, and
|
|
* set remaining message length.
|
|
*/
|
|
xdr->p = (__be32 *)((char *)iov->iov_base + padding);
|
|
xdr->end = (__be32 *)((char *)iov->iov_base + end);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xdr_read_pages);
|
|
|
|
/**
|
|
* xdr_enter_page - decode data from the XDR page
|
|
* @xdr: pointer to xdr_stream struct
|
|
* @len: number of bytes of page data
|
|
*
|
|
* Moves data beyond the current pointer position from the XDR head[] buffer
|
|
* into the page list. Any data that lies beyond current position + "len"
|
|
* bytes is moved into the XDR tail[]. The current pointer is then
|
|
* repositioned at the beginning of the first XDR page.
|
|
*/
|
|
void xdr_enter_page(struct xdr_stream *xdr, unsigned int len)
|
|
{
|
|
char * kaddr = page_address(xdr->buf->pages[0]);
|
|
xdr_read_pages(xdr, len);
|
|
/*
|
|
* Position current pointer at beginning of tail, and
|
|
* set remaining message length.
|
|
*/
|
|
if (len > PAGE_CACHE_SIZE - xdr->buf->page_base)
|
|
len = PAGE_CACHE_SIZE - xdr->buf->page_base;
|
|
xdr->p = (__be32 *)(kaddr + xdr->buf->page_base);
|
|
xdr->end = (__be32 *)((char *)xdr->p + len);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xdr_enter_page);
|
|
|
|
static struct kvec empty_iov = {.iov_base = NULL, .iov_len = 0};
|
|
|
|
void
|
|
xdr_buf_from_iov(struct kvec *iov, struct xdr_buf *buf)
|
|
{
|
|
buf->head[0] = *iov;
|
|
buf->tail[0] = empty_iov;
|
|
buf->page_len = 0;
|
|
buf->buflen = buf->len = iov->iov_len;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xdr_buf_from_iov);
|
|
|
|
/* Sets subbuf to the portion of buf of length len beginning base bytes
|
|
* from the start of buf. Returns -1 if base of length are out of bounds. */
|
|
int
|
|
xdr_buf_subsegment(struct xdr_buf *buf, struct xdr_buf *subbuf,
|
|
unsigned int base, unsigned int len)
|
|
{
|
|
subbuf->buflen = subbuf->len = len;
|
|
if (base < buf->head[0].iov_len) {
|
|
subbuf->head[0].iov_base = buf->head[0].iov_base + base;
|
|
subbuf->head[0].iov_len = min_t(unsigned int, len,
|
|
buf->head[0].iov_len - base);
|
|
len -= subbuf->head[0].iov_len;
|
|
base = 0;
|
|
} else {
|
|
subbuf->head[0].iov_base = NULL;
|
|
subbuf->head[0].iov_len = 0;
|
|
base -= buf->head[0].iov_len;
|
|
}
|
|
|
|
if (base < buf->page_len) {
|
|
subbuf->page_len = min(buf->page_len - base, len);
|
|
base += buf->page_base;
|
|
subbuf->page_base = base & ~PAGE_CACHE_MASK;
|
|
subbuf->pages = &buf->pages[base >> PAGE_CACHE_SHIFT];
|
|
len -= subbuf->page_len;
|
|
base = 0;
|
|
} else {
|
|
base -= buf->page_len;
|
|
subbuf->page_len = 0;
|
|
}
|
|
|
|
if (base < buf->tail[0].iov_len) {
|
|
subbuf->tail[0].iov_base = buf->tail[0].iov_base + base;
|
|
subbuf->tail[0].iov_len = min_t(unsigned int, len,
|
|
buf->tail[0].iov_len - base);
|
|
len -= subbuf->tail[0].iov_len;
|
|
base = 0;
|
|
} else {
|
|
subbuf->tail[0].iov_base = NULL;
|
|
subbuf->tail[0].iov_len = 0;
|
|
base -= buf->tail[0].iov_len;
|
|
}
|
|
|
|
if (base || len)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xdr_buf_subsegment);
|
|
|
|
static void __read_bytes_from_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len)
|
|
{
|
|
unsigned int this_len;
|
|
|
|
this_len = min_t(unsigned int, len, subbuf->head[0].iov_len);
|
|
memcpy(obj, subbuf->head[0].iov_base, this_len);
|
|
len -= this_len;
|
|
obj += this_len;
|
|
this_len = min_t(unsigned int, len, subbuf->page_len);
|
|
if (this_len)
|
|
_copy_from_pages(obj, subbuf->pages, subbuf->page_base, this_len);
|
|
len -= this_len;
|
|
obj += this_len;
|
|
this_len = min_t(unsigned int, len, subbuf->tail[0].iov_len);
|
|
memcpy(obj, subbuf->tail[0].iov_base, this_len);
|
|
}
|
|
|
|
/* obj is assumed to point to allocated memory of size at least len: */
|
|
int read_bytes_from_xdr_buf(struct xdr_buf *buf, unsigned int base, void *obj, unsigned int len)
|
|
{
|
|
struct xdr_buf subbuf;
|
|
int status;
|
|
|
|
status = xdr_buf_subsegment(buf, &subbuf, base, len);
|
|
if (status != 0)
|
|
return status;
|
|
__read_bytes_from_xdr_buf(&subbuf, obj, len);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(read_bytes_from_xdr_buf);
|
|
|
|
static void __write_bytes_to_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len)
|
|
{
|
|
unsigned int this_len;
|
|
|
|
this_len = min_t(unsigned int, len, subbuf->head[0].iov_len);
|
|
memcpy(subbuf->head[0].iov_base, obj, this_len);
|
|
len -= this_len;
|
|
obj += this_len;
|
|
this_len = min_t(unsigned int, len, subbuf->page_len);
|
|
if (this_len)
|
|
_copy_to_pages(subbuf->pages, subbuf->page_base, obj, this_len);
|
|
len -= this_len;
|
|
obj += this_len;
|
|
this_len = min_t(unsigned int, len, subbuf->tail[0].iov_len);
|
|
memcpy(subbuf->tail[0].iov_base, obj, this_len);
|
|
}
|
|
|
|
/* obj is assumed to point to allocated memory of size at least len: */
|
|
int write_bytes_to_xdr_buf(struct xdr_buf *buf, unsigned int base, void *obj, unsigned int len)
|
|
{
|
|
struct xdr_buf subbuf;
|
|
int status;
|
|
|
|
status = xdr_buf_subsegment(buf, &subbuf, base, len);
|
|
if (status != 0)
|
|
return status;
|
|
__write_bytes_to_xdr_buf(&subbuf, obj, len);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
xdr_decode_word(struct xdr_buf *buf, unsigned int base, u32 *obj)
|
|
{
|
|
__be32 raw;
|
|
int status;
|
|
|
|
status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
|
|
if (status)
|
|
return status;
|
|
*obj = be32_to_cpu(raw);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xdr_decode_word);
|
|
|
|
int
|
|
xdr_encode_word(struct xdr_buf *buf, unsigned int base, u32 obj)
|
|
{
|
|
__be32 raw = cpu_to_be32(obj);
|
|
|
|
return write_bytes_to_xdr_buf(buf, base, &raw, sizeof(obj));
|
|
}
|
|
EXPORT_SYMBOL_GPL(xdr_encode_word);
|
|
|
|
/* If the netobj starting offset bytes from the start of xdr_buf is contained
|
|
* entirely in the head or the tail, set object to point to it; otherwise
|
|
* try to find space for it at the end of the tail, copy it there, and
|
|
* set obj to point to it. */
|
|
int xdr_buf_read_netobj(struct xdr_buf *buf, struct xdr_netobj *obj, unsigned int offset)
|
|
{
|
|
struct xdr_buf subbuf;
|
|
|
|
if (xdr_decode_word(buf, offset, &obj->len))
|
|
return -EFAULT;
|
|
if (xdr_buf_subsegment(buf, &subbuf, offset + 4, obj->len))
|
|
return -EFAULT;
|
|
|
|
/* Is the obj contained entirely in the head? */
|
|
obj->data = subbuf.head[0].iov_base;
|
|
if (subbuf.head[0].iov_len == obj->len)
|
|
return 0;
|
|
/* ..or is the obj contained entirely in the tail? */
|
|
obj->data = subbuf.tail[0].iov_base;
|
|
if (subbuf.tail[0].iov_len == obj->len)
|
|
return 0;
|
|
|
|
/* use end of tail as storage for obj:
|
|
* (We don't copy to the beginning because then we'd have
|
|
* to worry about doing a potentially overlapping copy.
|
|
* This assumes the object is at most half the length of the
|
|
* tail.) */
|
|
if (obj->len > buf->buflen - buf->len)
|
|
return -ENOMEM;
|
|
if (buf->tail[0].iov_len != 0)
|
|
obj->data = buf->tail[0].iov_base + buf->tail[0].iov_len;
|
|
else
|
|
obj->data = buf->head[0].iov_base + buf->head[0].iov_len;
|
|
__read_bytes_from_xdr_buf(&subbuf, obj->data, obj->len);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xdr_buf_read_netobj);
|
|
|
|
/* Returns 0 on success, or else a negative error code. */
|
|
static int
|
|
xdr_xcode_array2(struct xdr_buf *buf, unsigned int base,
|
|
struct xdr_array2_desc *desc, int encode)
|
|
{
|
|
char *elem = NULL, *c;
|
|
unsigned int copied = 0, todo, avail_here;
|
|
struct page **ppages = NULL;
|
|
int err;
|
|
|
|
if (encode) {
|
|
if (xdr_encode_word(buf, base, desc->array_len) != 0)
|
|
return -EINVAL;
|
|
} else {
|
|
if (xdr_decode_word(buf, base, &desc->array_len) != 0 ||
|
|
desc->array_len > desc->array_maxlen ||
|
|
(unsigned long) base + 4 + desc->array_len *
|
|
desc->elem_size > buf->len)
|
|
return -EINVAL;
|
|
}
|
|
base += 4;
|
|
|
|
if (!desc->xcode)
|
|
return 0;
|
|
|
|
todo = desc->array_len * desc->elem_size;
|
|
|
|
/* process head */
|
|
if (todo && base < buf->head->iov_len) {
|
|
c = buf->head->iov_base + base;
|
|
avail_here = min_t(unsigned int, todo,
|
|
buf->head->iov_len - base);
|
|
todo -= avail_here;
|
|
|
|
while (avail_here >= desc->elem_size) {
|
|
err = desc->xcode(desc, c);
|
|
if (err)
|
|
goto out;
|
|
c += desc->elem_size;
|
|
avail_here -= desc->elem_size;
|
|
}
|
|
if (avail_here) {
|
|
if (!elem) {
|
|
elem = kmalloc(desc->elem_size, GFP_KERNEL);
|
|
err = -ENOMEM;
|
|
if (!elem)
|
|
goto out;
|
|
}
|
|
if (encode) {
|
|
err = desc->xcode(desc, elem);
|
|
if (err)
|
|
goto out;
|
|
memcpy(c, elem, avail_here);
|
|
} else
|
|
memcpy(elem, c, avail_here);
|
|
copied = avail_here;
|
|
}
|
|
base = buf->head->iov_len; /* align to start of pages */
|
|
}
|
|
|
|
/* process pages array */
|
|
base -= buf->head->iov_len;
|
|
if (todo && base < buf->page_len) {
|
|
unsigned int avail_page;
|
|
|
|
avail_here = min(todo, buf->page_len - base);
|
|
todo -= avail_here;
|
|
|
|
base += buf->page_base;
|
|
ppages = buf->pages + (base >> PAGE_CACHE_SHIFT);
|
|
base &= ~PAGE_CACHE_MASK;
|
|
avail_page = min_t(unsigned int, PAGE_CACHE_SIZE - base,
|
|
avail_here);
|
|
c = kmap(*ppages) + base;
|
|
|
|
while (avail_here) {
|
|
avail_here -= avail_page;
|
|
if (copied || avail_page < desc->elem_size) {
|
|
unsigned int l = min(avail_page,
|
|
desc->elem_size - copied);
|
|
if (!elem) {
|
|
elem = kmalloc(desc->elem_size,
|
|
GFP_KERNEL);
|
|
err = -ENOMEM;
|
|
if (!elem)
|
|
goto out;
|
|
}
|
|
if (encode) {
|
|
if (!copied) {
|
|
err = desc->xcode(desc, elem);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
memcpy(c, elem + copied, l);
|
|
copied += l;
|
|
if (copied == desc->elem_size)
|
|
copied = 0;
|
|
} else {
|
|
memcpy(elem + copied, c, l);
|
|
copied += l;
|
|
if (copied == desc->elem_size) {
|
|
err = desc->xcode(desc, elem);
|
|
if (err)
|
|
goto out;
|
|
copied = 0;
|
|
}
|
|
}
|
|
avail_page -= l;
|
|
c += l;
|
|
}
|
|
while (avail_page >= desc->elem_size) {
|
|
err = desc->xcode(desc, c);
|
|
if (err)
|
|
goto out;
|
|
c += desc->elem_size;
|
|
avail_page -= desc->elem_size;
|
|
}
|
|
if (avail_page) {
|
|
unsigned int l = min(avail_page,
|
|
desc->elem_size - copied);
|
|
if (!elem) {
|
|
elem = kmalloc(desc->elem_size,
|
|
GFP_KERNEL);
|
|
err = -ENOMEM;
|
|
if (!elem)
|
|
goto out;
|
|
}
|
|
if (encode) {
|
|
if (!copied) {
|
|
err = desc->xcode(desc, elem);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
memcpy(c, elem + copied, l);
|
|
copied += l;
|
|
if (copied == desc->elem_size)
|
|
copied = 0;
|
|
} else {
|
|
memcpy(elem + copied, c, l);
|
|
copied += l;
|
|
if (copied == desc->elem_size) {
|
|
err = desc->xcode(desc, elem);
|
|
if (err)
|
|
goto out;
|
|
copied = 0;
|
|
}
|
|
}
|
|
}
|
|
if (avail_here) {
|
|
kunmap(*ppages);
|
|
ppages++;
|
|
c = kmap(*ppages);
|
|
}
|
|
|
|
avail_page = min(avail_here,
|
|
(unsigned int) PAGE_CACHE_SIZE);
|
|
}
|
|
base = buf->page_len; /* align to start of tail */
|
|
}
|
|
|
|
/* process tail */
|
|
base -= buf->page_len;
|
|
if (todo) {
|
|
c = buf->tail->iov_base + base;
|
|
if (copied) {
|
|
unsigned int l = desc->elem_size - copied;
|
|
|
|
if (encode)
|
|
memcpy(c, elem + copied, l);
|
|
else {
|
|
memcpy(elem + copied, c, l);
|
|
err = desc->xcode(desc, elem);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
todo -= l;
|
|
c += l;
|
|
}
|
|
while (todo) {
|
|
err = desc->xcode(desc, c);
|
|
if (err)
|
|
goto out;
|
|
c += desc->elem_size;
|
|
todo -= desc->elem_size;
|
|
}
|
|
}
|
|
err = 0;
|
|
|
|
out:
|
|
kfree(elem);
|
|
if (ppages)
|
|
kunmap(*ppages);
|
|
return err;
|
|
}
|
|
|
|
int
|
|
xdr_decode_array2(struct xdr_buf *buf, unsigned int base,
|
|
struct xdr_array2_desc *desc)
|
|
{
|
|
if (base >= buf->len)
|
|
return -EINVAL;
|
|
|
|
return xdr_xcode_array2(buf, base, desc, 0);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xdr_decode_array2);
|
|
|
|
int
|
|
xdr_encode_array2(struct xdr_buf *buf, unsigned int base,
|
|
struct xdr_array2_desc *desc)
|
|
{
|
|
if ((unsigned long) base + 4 + desc->array_len * desc->elem_size >
|
|
buf->head->iov_len + buf->page_len + buf->tail->iov_len)
|
|
return -EINVAL;
|
|
|
|
return xdr_xcode_array2(buf, base, desc, 1);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xdr_encode_array2);
|
|
|
|
int
|
|
xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len,
|
|
int (*actor)(struct scatterlist *, void *), void *data)
|
|
{
|
|
int i, ret = 0;
|
|
unsigned page_len, thislen, page_offset;
|
|
struct scatterlist sg[1];
|
|
|
|
sg_init_table(sg, 1);
|
|
|
|
if (offset >= buf->head[0].iov_len) {
|
|
offset -= buf->head[0].iov_len;
|
|
} else {
|
|
thislen = buf->head[0].iov_len - offset;
|
|
if (thislen > len)
|
|
thislen = len;
|
|
sg_set_buf(sg, buf->head[0].iov_base + offset, thislen);
|
|
ret = actor(sg, data);
|
|
if (ret)
|
|
goto out;
|
|
offset = 0;
|
|
len -= thislen;
|
|
}
|
|
if (len == 0)
|
|
goto out;
|
|
|
|
if (offset >= buf->page_len) {
|
|
offset -= buf->page_len;
|
|
} else {
|
|
page_len = buf->page_len - offset;
|
|
if (page_len > len)
|
|
page_len = len;
|
|
len -= page_len;
|
|
page_offset = (offset + buf->page_base) & (PAGE_CACHE_SIZE - 1);
|
|
i = (offset + buf->page_base) >> PAGE_CACHE_SHIFT;
|
|
thislen = PAGE_CACHE_SIZE - page_offset;
|
|
do {
|
|
if (thislen > page_len)
|
|
thislen = page_len;
|
|
sg_set_page(sg, buf->pages[i], thislen, page_offset);
|
|
ret = actor(sg, data);
|
|
if (ret)
|
|
goto out;
|
|
page_len -= thislen;
|
|
i++;
|
|
page_offset = 0;
|
|
thislen = PAGE_CACHE_SIZE;
|
|
} while (page_len != 0);
|
|
offset = 0;
|
|
}
|
|
if (len == 0)
|
|
goto out;
|
|
if (offset < buf->tail[0].iov_len) {
|
|
thislen = buf->tail[0].iov_len - offset;
|
|
if (thislen > len)
|
|
thislen = len;
|
|
sg_set_buf(sg, buf->tail[0].iov_base + offset, thislen);
|
|
ret = actor(sg, data);
|
|
len -= thislen;
|
|
}
|
|
if (len != 0)
|
|
ret = -EINVAL;
|
|
out:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xdr_process_buf);
|
|
|