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raid5extend.c
79 строк
2 KB
Neil Brown
Remove spaces/tabs from ends of lines.
14 дек 2007, 12:13
14 дек 2007, 12:13
aba6914
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int phys2log(int phys, int stripe, int n, int layout) { /* In an 'n' disk array using 'layout', * in stripe 'stripe', the physical disc 'phys' * stores what logical chunk? * -1 mean parity. * */ switch(layout) { case ALGORITHM_LEFT_ASYMMETRIC: pd = (n-1) - (stripe % n); if (phys < pd) return phys; else if (phys == pd) return -1; else return phys-1; case ALGORITHM_RIGHT_ASYMMETRIC: pd = stripe % n; if (phys < pd) return phys; else if (phys == pd) return -1; else return phys-1; case ALGORITHM_LEFT_SYMMETRIC: pd = (n-1) - (stripe %n); if (phys < pd) return phys+ n-1-pd; else if (phys == pd) return -1; else return phys-pd-1; case ALGORITHM_RIGHT_SYMMETRIC: pd = stripe % n; if (phys < pd) return phys+ n-1-pd; else if (phys == pd) return -1; else return phys-pd-1; } return -2; } raid5_extend(unsigned long len, int chunksize, int layout, int n, int m, int rfds[], int wfds[]) { static char buf[4096]; unsigned long blocks = len/4; unsigned int blocksperchunk= chunksize/4096; unsigned long b; for (b=0; b<blocks; b++) { unsigned long stripe = b / blocksperchunk; unsigned int offset = b - (stripe*blocksperchunk); unsigned long chunk = stripe * (n-1); int src; for (src=0; src<n; src++) { int dnum, snum; if (read(rfds[src], buf, sizeof(buf)) != sizeof(buf)) { error(); return 0; } snum = phys2log(src, stripe, n, layout); if (snum == -1) continue; chunk = stripe*(n-1)+snum; dstripe = chunk/(m-1); dnum = log2phys(chunk-(stripe*(m-1)), dstripe, m, layout); llseek(wfds[dnum], dstripe*chunksize+(offset*4096), 0); write(wfds[dnum], buf, sizeof(buf)); } } }