ref: a411870ee4640241e3c494367d922847da84f972
dir: /libnandfs/writepageauxilliary.c/
#include "logfsos.h"
#include "logfs.h"
#include "nandfs.h"
#include "local.h"
/*
* update the tags in a page's auxiliary area
* only touch the fields if they contain some zeros, and compute the hamming codes
* as well
*/
char *
nandfswritepageauxiliary(Nandfs *nandfs, NandfsTags *tags, long absblock, int page)
{
NandfsAuxiliary hdr;
ulong tmp;
ushort htmp;
memset(&hdr, 0xff, sizeof(hdr));
if (tags->path < NandfsPathMask) {
tmp = _nandfshamming31_26calc((tags->path << 6)) | (1 << 5);
putbig4(hdr.parth, tmp);
}
if (tags->nerase < NandfsNeraseMask || tags->magic != 0xff) {
tmp = _nandfshamming31_26calc((tags->magic << 24) | (tags->nerase << 6)) | (1 << 5);
htmp = tmp >> 16;
putbig2(hdr.nerasemagicmsw, htmp);
putbig2(hdr.nerasemagiclsw, tmp);
}
if (tags->tag != 0xff)
hdr.tag = tags->tag;
return (*nandfs->write)(nandfs->magic, &hdr, sizeof(hdr), nandfs->rawblocksize * absblock + page * NandfsFullSize + NandfsPageSize);
}