gfs2: Fix extended attribute readahead optimization

Commit 39b0555 didn't check for a failing bio_add_page in gfs2_submit_bhs. This could cause I/O requests to get lost, and the affected buffer heads to stay locked forever. Fix that by submitting the current bio and allocating another one when bio_add_page fails. (It is guaranteed that we can at least add one page to a bio.) Signed-off-by: Andreas Gruenbacher <[email protected]> Signed-off-by: Bob Peterson <[email protected]>
akvadrako · Aug 18, 2016 · 23e5671 · 23e5671
1 parent 1c185c0
commit 23e5671
Showing 1 changed file with 19 additions and 16 deletions.
diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
@@ -216,23 +216,26 @@ static void gfs2_meta_read_endio(struct bio *bio)
 static void gfs2_submit_bhs(int op, int op_flags, struct buffer_head *bhs[],
 			    int num)
 {
-	struct buffer_head *bh = bhs[0];
-	struct bio *bio;
-	int i;
-
-	if (!num)
-		return;
-
-	bio = bio_alloc(GFP_NOIO, num);
-	bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9);
-	bio->bi_bdev = bh->b_bdev;
-	for (i = 0; i < num; i++) {
-		bh = bhs[i];
-		bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh));
+	while (num > 0) {
+		struct buffer_head *bh = *bhs;
+		struct bio *bio;
+
+		bio = bio_alloc(GFP_NOIO, num);
+		bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9);
+		bio->bi_bdev = bh->b_bdev;
+		while (num > 0) {
+			bh = *bhs;
+			if (!bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh))) {
+				BUG_ON(bio->bi_iter.bi_size == 0);
+				break;
+			}
+			bhs++;
+			num--;
+		}
+		bio->bi_end_io = gfs2_meta_read_endio;
+		bio_set_op_attrs(bio, op, op_flags);
+		submit_bio(bio);
 	}
-	bio->bi_end_io = gfs2_meta_read_endio;
-	bio_set_op_attrs(bio, op, op_flags);
-	submit_bio(bio);
 }
 
 /**