ref: c8b187f9db503465460d8bafa2d7a758bbcf59ca
dir: /liblogfs/format.c/
#include "logfsos.h" #include "logfs.h" #include "local.h" char * logfsformat(LogfsLowLevel *ll, long base, long limit, long bootsize, int trace) { long bootblocksdone, logblocksdone; long u; long baseblock, limitblock, bootblocks, sizeinblocks; int magicfound; void *llsave; if(trace > 1) print("logfsformat: base %ld limit %ld bootsize %lud\n", base, limit, bootsize); if((*ll->getopenstatus)(ll)) return Eperm; if(!(*ll->calcformat)(ll, base, limit, bootsize, &baseblock, &limitblock, &bootblocks)) return Ebadarg; if(trace > 0) print("logfsformat: baseblock %ld limitblock %ld bootblocks %ld\n", baseblock, limitblock, bootblocks); bootblocksdone = 0; logblocksdone = 0; /* * we need to create some fs blocks, and some boot blocks * the number of boot blocks is fixed; the number of fs blocks * occupies the remainder * the layout is randomised to: * 1) test the software * 2) spread wear around if a lot of format commands are issued by * the bootloader */ sizeinblocks = limitblock - baseblock; for(u = 0; u < sizeinblocks; u++) { int r; uchar tag; long path; LogfsLowLevelReadResult e; char *errmsg; int markedbad; if(trace > 1) print("block %lud:", u); llsave = nil; errmsg = (*ll->getblockstatus)(ll, u + baseblock, &magicfound, &llsave, &e); if(errmsg) return errmsg; if(e == LogfsLowLevelReadResultBad) { if(trace > 1) print(" marked bad\n"); continue; } errmsg = (*ll->eraseblock)(ll, u + baseblock, nil, &markedbad); if(errmsg) return errmsg; if(markedbad) { if(trace > 1) print(" marked bad\n"); continue; } if(e != LogfsLowLevelReadResultHardError && magicfound) { if(trace > 1) print(" previously formatted"); } r = nrand(sizeinblocks - u); if(bootblocksdone < bootblocks && r < (bootblocks - bootblocksdone)) { tag = LogfsTboot; path = mkdatapath(bootblocksdone, 0); } else { tag = LogfsTnone; path = ~0; } if(trace > 1) print(" tag %s path %ld", logfstagname(tag), path); errmsg = (*ll->formatblock)(ll, u + baseblock, tag, path, baseblock, sizeinblocks, 1, &bootblocks, llsave, &markedbad); logfsfreemem(llsave); if(errmsg) return errmsg; if(markedbad) { if(trace > 1) print(" marked bad\n"); continue; } switch(tag) { case LogfsTboot: bootblocksdone++; break; case LogfsTnone: logblocksdone++; break; } if(trace > 1) print("\n"); } if(bootblocksdone < bootblocks) return "not enough capacity left for boot"; if(trace > 0) print("log blocks %lud\n", logblocksdone); return nil; }