225 nr_swap_pages--;
226 offset = scan_swap_map(si);
227 if (offset) {
228 spin_unlock(&swap_lock);
229 return swp_entry(type, offset);
230 }
231 nr_swap_pages++;
232 }
233 spin_unlock(&swap_lock);
234 return (swp_entry_t) {0};
235}
236
237static struct swap_info_struct * swap_info_get(swp_entry_t entry)
238{
239 struct swap_info_struct * p;
240 unsigned long offset, type;
241
242 if (!entry.val)
243 goto out;
244 type = swp_type(entry);
245 if (type >= nr_swapfiles)
246 goto bad_nofile;
247 p = & swap_info[type];
248 if (!(p->flags & SWP_USED))
249 goto bad_device;
250 offset = swp_offset(entry);
251 if (offset >= p->max)
252 goto bad_offset;
253 if (!p->swap_map[offset])
254 goto bad_free;
255 spin_lock(&swap_lock);
256 return p;
257
258bad_free:
259 printk(KERN_ERR "swap_free: %s%08lx\n", Unused_offset, entry.val);
260 goto out;
261bad_offset:
262 printk(KERN_ERR "swap_free: %s%08lx\n", Bad_offset, entry.val);
263 goto out;
264bad_device:
265 printk(KERN_ERR "swap_free: %s%08lx\n", Unused_file, entry.val);