ref: 7975eec3e602fd5bc3e93c78f4166259190f2fe9
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); }