Fei
205 static inline int load_block_bitmap (struct super_block * sb,
206 unsigned int block_group)
207 {
208 int slot;
209
210 /*
211 * Do the lookup for the slot. First of all, check if we're
asking
212 * for the same slot as last time, and did we succeed that
last time?
213 */
214 if (sb->u.ext2_sb.s_loaded_block_bitmaps > 0 &&
215 sb->u.ext2_sb.s_block_bitmap_number[0] == block_group &&
216 sb->u.ext2_sb.s_block_bitmap[block_group]) {
217 return 0;
218 }
219 /*
220 * Or can we do a fast lookup based on a loaded group on a
filesystem
221 * small enough to be mapped directly into the superblock?
222 */
223 else if (sb->u.ext2_sb.s_groups_count <= EXT2_MAX_GROUP_LOADED
&&
224 sb->u.ext2_sb.s_block_bitmap_number[block_group] ==
block_group &&
225 sb->u.ext2_sb.s_block_bitmap[block_group]) {
226 slot = block_group;
227 }
228 /*
229 * If not, then do a full lookup for this block group.
230 */
231 else {
232 slot = load__block_bitmap (sb, block_group);
233 }
234
235 /*
236 * <0 means we just got an error
237 */
238 if (slot < 0)
239 return slot;
240
241 /*
242 * If it's a valid slot, we may still have cached a previous
IO error,
243 * in which case the bh in the superblock cache will be zero.
244 */
245 if (!sb->u.ext2_sb.s_block_bitmap[slot])
246 return -EIO;
247
248 /*
249 * Must have been read in OK to get this far.
250 */
251 return slot;
252 }
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