Blame gfs2/libgfs2/fs_geometry.c

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#include "clusterautoconfig.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <inttypes.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <linux/types.h>
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#include "libgfs2.h"
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#include "config.h"
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/**
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 * Given a number of blocks in a resource group, return the number of blocks
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 * needed for bitmaps. Also calculate the adjusted number of free data blocks
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 * in the resource group and store it in *ri_data.
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 */
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uint32_t rgblocks2bitblocks(const unsigned int bsize, const uint32_t rgblocks, uint32_t *ri_data)
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{
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	uint32_t mappable = 0;
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	uint32_t bitblocks = 0;
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	/* Number of blocks mappable by bitmap blocks with these header types */
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	const uint32_t blks_rgrp = GFS2_NBBY * (bsize - sizeof(struct gfs2_rgrp));
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	const uint32_t blks_meta = GFS2_NBBY * (bsize - sizeof(struct gfs2_meta_header));
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	while (blks_rgrp + (blks_meta * bitblocks) < ((rgblocks - bitblocks) & ~(uint32_t)3))
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		bitblocks++;
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	if (bitblocks > 0)
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		mappable = blks_rgrp + (blks_meta * (bitblocks - 1));
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	*ri_data = (rgblocks - (bitblocks + 1)) & ~(uint32_t)3;
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	if (mappable < *ri_data)
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		bitblocks++;
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	return bitblocks;
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}
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/**
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 * build_rgrps - write a bunch of resource groups to disk.
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 * If fd > 0, write the data to the given file handle.
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 * Otherwise, use gfs2 buffering in buf.c.
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 */
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int build_rgrps(struct gfs2_sbd *sdp, int do_write)
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{
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	struct osi_node *n, *next = NULL;
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	struct rgrp_tree *rl;
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	uint32_t rgblocks, bitblocks;
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	struct gfs2_rindex *ri;
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	struct gfs2_meta_header mh;
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	unsigned int x;
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	mh.mh_magic = GFS2_MAGIC;
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	mh.mh_type = GFS2_METATYPE_RB;
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	mh.mh_format = GFS2_FORMAT_RB;
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	if (do_write)
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		n = osi_first(&sdp->rgtree);
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	else
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		n = osi_first(&sdp->rgcalc);
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	for (; n; n = next) {
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		next = osi_next(n);
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		rl = (struct rgrp_tree *)n;
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		ri = &rl->ri;
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		bitblocks = rgblocks2bitblocks(sdp->bsize, rl->length, &rgblocks);
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		ri->ri_addr = rl->start;
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		ri->ri_length = bitblocks;
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		ri->ri_data0 = rl->start + bitblocks;
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		ri->ri_data = rgblocks;
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		ri->ri_bitbytes = rgblocks / GFS2_NBBY;
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		memset(&rl->rg, 0, sizeof(rl->rg));
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		rl->rg.rg_header.mh_magic = GFS2_MAGIC;
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		rl->rg.rg_header.mh_type = GFS2_METATYPE_RG;
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		rl->rg.rg_header.mh_format = GFS2_FORMAT_RG;
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		rl->rg.rg_free = rgblocks;
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		if (gfs2_compute_bitstructs(sdp->sd_sb.sb_bsize, rl))
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			return -1;
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		if (do_write) {
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			for (x = 0; x < bitblocks; x++) {
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				rl->bits[x].bi_bh = bget(sdp, rl->start + x);
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				if (x)
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					gfs2_meta_header_out(&mh, rl->bits[x].bi_bh->b_data);
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				else
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					gfs2_rgrp_out(&rl->rg, rl->bits[x].bi_bh->b_data);
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				bmodified(rl->bits[x].bi_bh);
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			}
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		}
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		if (cfg_debug) {
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			printf("\n");
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			gfs2_rindex_print(ri);
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		}
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		sdp->blks_total += rgblocks;
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		sdp->fssize = ri->ri_data0 + ri->ri_data;
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	}
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	return 0;
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}