void
flush(int fd, struct bufarea *bp)
{
int i, j;
if (!bp->b_dirty)
return;
bp->b_dirty = 0;
if (fswritefd < 0) {
pfatal("WRITING IN READ_ONLY MODE.\n");
return;
}
if (bp->b_errs != 0)
pfatal("WRITING %sZERO'ED BLOCK %lld TO DISK\n",
(bp->b_errs == bp->b_size / dev_bsize) ? "" : "PARTIALLY ",
(long long)bp->b_bno);
bp->b_errs = 0;
blwrite(fd, bp->b_un.b_buf, bp->b_bno, (long)bp->b_size);
if (bp != &sblk)
return;
for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
blwrite(fswritefd, (char *)sblock.fs_csp + i,
fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
sblock.fs_cssize - i < sblock.fs_bsize ?
sblock.fs_cssize - i : sblock.fs_bsize);
}
}
/*
* Read the last sector of the boot block, replace the last
* 20 bytes with the recovery information, then write it back.
* The recovery information only works for UFS2 filesystems.
*/
static void
saverecovery(int readfd, int writefd)
{
struct fsrecovery *fsr;
char *fsrbuf;
u_int secsize;
if (sblock.fs_magic != FS_UFS2_MAGIC ||
ioctl(readfd, DIOCGSECTORSIZE, &secsize) == -1 ||
(fsrbuf = Malloc(secsize)) == NULL ||
blread(readfd, fsrbuf, (SBLOCK_UFS2 - secsize) / dev_bsize,
secsize) != 0) {
printf("RECOVERY DATA COULD NOT BE CREATED\n");
return;
}
fsr = (struct fsrecovery *)&fsrbuf[secsize - sizeof *fsr];
fsr->fsr_magic = sblock.fs_magic;
fsr->fsr_fpg = sblock.fs_fpg;
fsr->fsr_fsbtodb = sblock.fs_fsbtodb;
fsr->fsr_sblkno = sblock.fs_sblkno;
fsr->fsr_ncg = sblock.fs_ncg;
blwrite(writefd, fsrbuf, (SBLOCK_UFS2 - secsize) / secsize, secsize);
free(fsrbuf);
}
