diff options
author | Andreas Gruenbacher <agruenba@redhat.com> | 2020-05-26 20:11:51 +0200 |
---|---|---|
committer | Andreas Gruenbacher <agruenba@redhat.com> | 2020-05-29 17:00:24 +0200 |
commit | 20be493b787cd581c9fffad7fcd6bfbe6af1050c (patch) | |
tree | ac94020ca600923558138fa83c8d31e290aa10d6 /fs | |
parent | 9cb1fd0efd195590b828b9b865421ad345a4a145 (diff) |
gfs2: Even more gfs2_find_jhead fixes
Fix several issues in the previous gfs2_find_jhead fix:
* When updating @blocks_submitted, @block refers to the first block block not
submitted yet, not the last block submitted, so fix an off-by-one error.
* We want to ensure that @blocks_submitted is far enough ahead of @blocks_read
to guarantee that there is in-flight I/O. Otherwise, we'll eventually end up
waiting for pages that haven't been submitted, yet.
* It's much easier to compare the number of blocks added with the number of
blocks submitted to limit the maximum bio size.
* Even with bio chaining, we can keep adding blocks until we reach the maximum
bio size, as long as we stop at a page boundary. This simplifies the logic.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Bob Peterson <rpeterso@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/gfs2/lops.c | 15 |
1 files changed, 5 insertions, 10 deletions
diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c index 48b54ec1c793..cb2a11b458c6 100644 --- a/fs/gfs2/lops.c +++ b/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; } |