Fix the previous, flawed gfs2_find_jhead commit

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Merge tag 'gfs2-v5.7-rc7.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2

Pull gfs2 fix from Andreas Gruenbacher:
 "Fix the previous, flawed gfs2_find_jhead commit"

* tag 'gfs2-v5.7-rc7.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
  gfs2: Even more gfs2_find_jhead fixes

fs/gfs2/lops.c

@@ -509,12 +509,12 @@ int gfs2_find_jhead(struct gfs2_jdesc *jd, struct gfs2_log_header_host *head,
 	unsigned int bsize = sdp->sd_sb.sb_bsize, off;
 	unsigned int bsize_shift = sdp->sd_sb.sb_bsize_shift;
 	unsigned int shift = PAGE_SHIFT - bsize_shift;
-	unsigned int max_bio_size = 2 * 1024 * 1024;
+	unsigned int max_blocks = 2 * 1024 * 1024 >> bsize_shift;
 	struct gfs2_journal_extent *je;
 	int sz, ret = 0;
 	struct bio *bio = NULL;
 	struct page *page = NULL;
-	bool bio_chained = false, done = false;
+	bool done = false;
 	errseq_t since;
 
 	memset(head, 0, sizeof(*head));
@@ -537,10 +537,7 @@ int gfs2_find_jhead(struct gfs2_jdesc *jd, struct gfs2_log_header_host *head,
 				off = 0;
 			}
 
-			if (!bio || (bio_chained && !off) ||
-			    bio->bi_iter.bi_size >= max_bio_size) {
-				/* start new bio */
-			} else {
+			if (bio && (off || block < blocks_submitted + max_blocks)) {
 				sector_t sector = dblock << sdp->sd_fsb2bb_shift;
 
 				if (bio_end_sector(bio) == sector) {
@@ -553,19 +550,17 @@ int gfs2_find_jhead(struct gfs2_jdesc *jd, struct gfs2_log_header_host *head,
 						(PAGE_SIZE - off) >> bsize_shift;
 
 					bio = gfs2_chain_bio(bio, blocks);
-					bio_chained = true;
 					goto add_block_to_new_bio;
 				}
 			}
 
 			if (bio) {
-				blocks_submitted = block + 1;
+				blocks_submitted = block;
 				submit_bio(bio);
 			}
 
 			bio = gfs2_log_alloc_bio(sdp, dblock, gfs2_end_log_read);
 			bio->bi_opf = REQ_OP_READ;
-			bio_chained = false;
 add_block_to_new_bio:
 			sz = bio_add_page(bio, page, bsize, off);
 			BUG_ON(sz != bsize);
@@ -573,7 +568,7 @@ block_added:
 			off += bsize;
 			if (off == PAGE_SIZE)
 				page = NULL;
-			if (blocks_submitted < 2 * max_bio_size >> bsize_shift) {
+			if (blocks_submitted <= blocks_read + max_blocks) {
 				/* Keep at least one bio in flight */
 				continue;
 			}