+/* Read a contiguous batch of blocks. */
+int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
+ bool wait, struct buffer_head **bhs)
+{
+ int i, err;
+
+ for (i = 0; i < bh_count; i++) {
+ bhs[i] = ext4_getblk(NULL, inode, block + i, 0 /* map_flags */);
+ if (IS_ERR(bhs[i])) {
+ err = PTR_ERR(bhs[i]);
+ bh_count = i;
+ goto out_brelse;
+ }
+ }
+
+ for (i = 0; i < bh_count; i++)
+ /* Note that NULL bhs[i] is valid because of holes. */
+ if (bhs[i] && !buffer_uptodate(bhs[i]))
+ ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1,
+ &bhs[i]);
+
+ if (!wait)
+ return 0;
+
+ for (i = 0; i < bh_count; i++)
+ if (bhs[i])
+ wait_on_buffer(bhs[i]);
+
+ for (i = 0; i < bh_count; i++) {
+ if (bhs[i] && !buffer_uptodate(bhs[i])) {
+ err = -EIO;
+ goto out_brelse;
+ }
+ }
+ return 0;
+
+out_brelse:
+ for (i = 0; i < bh_count; i++) {
+ brelse(bhs[i]);
+ bhs[i] = NULL;
+ }
+ return err;
+}
+