void *hpfs_get_4sectors(struct super_block *s, unsigned secno,
struct quad_buffer_head *qbh)
{
cond_resched();
if (secno & 3) {
printk("HPFS: hpfs_get_4sectors: unaligned read\n");
return NULL;
}
/*return hpfs_map_4sectors(s, secno, qbh, 0);*/
if (!(qbh->data = kmalloc(2048, GFP_NOFS))) {
printk("HPFS: hpfs_get_4sectors: out of memory\n");
return NULL;
}
if (!(hpfs_get_sector(s, secno, &qbh->bh[0]))) goto bail0;
if (!(hpfs_get_sector(s, secno + 1, &qbh->bh[1]))) goto bail1;
if (!(hpfs_get_sector(s, secno + 2, &qbh->bh[2]))) goto bail2;
if (!(hpfs_get_sector(s, secno + 3, &qbh->bh[3]))) goto bail3;
memcpy(qbh->data, qbh->bh[0]->b_data, 512);
memcpy(qbh->data + 512, qbh->bh[1]->b_data, 512);
memcpy(qbh->data + 2*512, qbh->bh[2]->b_data, 512);
memcpy(qbh->data + 3*512, qbh->bh[3]->b_data, 512);
return qbh->data;
bail3: brelse(qbh->bh[2]);
bail2: brelse(qbh->bh[1]);
bail1: brelse(qbh->bh[0]);
bail0:
return NULL;
}
void *hpfs_get_4sectors(struct super_block *s, unsigned secno,
struct quad_buffer_head *qbh)
{
cond_resched();
hpfs_lock_assert(s);
if (secno & 3) {
pr_err("%s(): unaligned read\n", __func__);
return NULL;
}
if (!hpfs_get_sector(s, secno + 0, &qbh->bh[0])) goto bail0;
if (!hpfs_get_sector(s, secno + 1, &qbh->bh[1])) goto bail1;
if (!hpfs_get_sector(s, secno + 2, &qbh->bh[2])) goto bail2;
if (!hpfs_get_sector(s, secno + 3, &qbh->bh[3])) goto bail3;
if (likely(qbh->bh[1]->b_data == qbh->bh[0]->b_data + 1 * 512) &&
likely(qbh->bh[2]->b_data == qbh->bh[0]->b_data + 2 * 512) &&
likely(qbh->bh[3]->b_data == qbh->bh[0]->b_data + 3 * 512)) {
return qbh->data = qbh->bh[0]->b_data;
}
if (!(qbh->data = kmalloc(2048, GFP_NOFS))) {
pr_err("%s(): out of memory\n", __func__);
goto bail4;
}
return qbh->data;
bail4:
brelse(qbh->bh[3]);
bail3:
brelse(qbh->bh[2]);
bail2:
brelse(qbh->bh[1]);
bail1:
brelse(qbh->bh[0]);
bail0:
return NULL;
}
