ref: 57741d473f9d5165d142b165bd837984f6428c66
dir: /sys/src/cmd/venti/srv/fmtarenas.c/
#include "stdinc.h" #include "dat.h" #include "fns.h" void usage(void) { fprint(2, "usage: fmtarenas [-Z] [-b blocksize] [-a arenasize] name file\n"); threadexitsall(0); } void threadmain(int argc, char *argv[]) { int vers; ArenaPart *ap; Part *part; Arena *arena; u64int addr, limit, asize, apsize; char *file, *name, aname[ANameSize]; int i, n, blocksize, tabsize, zero; ventifmtinstall(); statsinit(); blocksize = 8 * 1024; asize = 512 * 1024 *1024; tabsize = 512 * 1024; /* BUG: should be determine from number of arenas */ zero = -1; vers = ArenaVersion5; ARGBEGIN{ case 'D': settrace(EARGF(usage())); break; case 'a': asize = unittoull(EARGF(usage())); if(asize == TWID64) usage(); break; case 'b': blocksize = unittoull(EARGF(usage())); if(blocksize == ~0) usage(); if(blocksize > MaxDiskBlock){ fprint(2, "block size too large, max %d\n", MaxDiskBlock); threadexitsall("usage"); } break; case '4': vers = ArenaVersion4; break; case 'Z': zero = 0; break; default: usage(); break; }ARGEND if(zero == -1){ if(vers == ArenaVersion4) zero = 1; else zero = 0; } if(argc != 2) usage(); name = argv[0]; file = argv[1]; if(nameok(name) < 0) sysfatal("illegal name template %s", name); part = initpart(file, ORDWR|ODIRECT); if(part == nil) sysfatal("can't open partition %s: %r", file); if(zero) zeropart(part, blocksize); maxblocksize = blocksize; initdcache(20*blocksize); ap = newarenapart(part, blocksize, tabsize); if(ap == nil) sysfatal("can't initialize arena: %r"); apsize = ap->size - ap->arenabase; n = apsize / asize; if(apsize - (n * asize) >= MinArenaSize) n++; fprint(2, "fmtarenas %s: %,d arenas, %,lld bytes storage, %,d bytes for index map\n", file, n, apsize, ap->tabsize); ap->narenas = n; ap->map = MKNZ(AMap, n); ap->arenas = MKNZ(Arena*, n); addr = ap->arenabase; for(i = 0; i < n; i++){ limit = addr + asize; if(limit >= ap->size || ap->size - limit < MinArenaSize){ limit = ap->size; if(limit - addr < MinArenaSize) sysfatal("bad arena set math: runt arena at %lld,%lld %lld", addr, limit, ap->size); } snprint(aname, ANameSize, "%s%d", name, i); if(0) fprint(2, "adding arena %s at [%lld,%lld)\n", aname, addr, limit); arena = newarena(part, vers, aname, addr, limit - addr, blocksize); if(!arena) fprint(2, "can't make new arena %s: %r", aname); freearena(arena); ap->map[i].start = addr; ap->map[i].stop = limit; namecp(ap->map[i].name, aname); addr = limit; } if(wbarenapart(ap) < 0) fprint(2, "can't write back arena partition header for %s: %r\n", file); flushdcache(); threadexitsall(0); }