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gfs2: More gfs2_find_jhead fixes 

It turns out that when extending an existing bio, gfs2_find_jhead fails to
check if the block number is consecutive, which leads to incorrect reads for
fragmented journals.

In addition, limit the maximum bio size to an arbitrary value of 2 megabytes:
since commit 07173c3ec2 ("block: enable multipage bvecs"), if we just keep
adding pages until bio_add_page fails, bios will grow much larger than useful,
which pins more memory than necessary with barely any additional performance
gains.

Fixes: f4686c26ec ("gfs2: read journal in large chunks")
Cc: stable@vger.kernel.org # v5.2+
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2020-04-28 01:15:41 +02:00
parent 566a2ab3c9
commit aa83da7f47
1 changed files with 12 additions and 7 deletions
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19
fs/gfs2/lops.c
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@ -263,7 +263,7 @@ static struct bio *gfs2_log_alloc_bio(struct gfs2_sbd *sdp, u64 blkno,
struct super_block *sb = sdp->sd_vfs;
struct bio *bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES);
bio->bi_iter.bi_sector = blkno << (sb->s_blocksize_bits - 9);
bio->bi_iter.bi_sector = blkno << sdp->sd_fsb2bb_shift;
bio_set_dev(bio, sb->s_bdev);
bio->bi_end_io = end_io;
bio->bi_private = sdp;
@ -509,7 +509,7 @@ 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 readahead_blocks = BIO_MAX_PAGES << shift;
unsigned int max_bio_size = 2 * 1024 * 1024;
struct gfs2_journal_extent *je;
int sz, ret = 0;
struct bio *bio = NULL;
@ -537,12 +537,17 @@ int gfs2_find_jhead(struct gfs2_jdesc *jd, struct gfs2_log_header_host *head,
off = 0;
}
if (!bio || (bio_chained && !off)) {
if (!bio || (bio_chained && !off) ||
bio->bi_iter.bi_size >= max_bio_size) {
/* start new bio */
} else {
sz = bio_add_page(bio, page, bsize, off);
if (sz == bsize)
goto block_added;
sector_t sector = dblock << sdp->sd_fsb2bb_shift;
if (bio_end_sector(bio) == sector) {
sz = bio_add_page(bio, page, bsize, off);
if (sz == bsize)
goto block_added;
}
if (off) {
unsigned int blocks =
(PAGE_SIZE - off) >> bsize_shift;
@ -568,7 +573,7 @@ block_added:
off += bsize;
if (off == PAGE_SIZE)
page = NULL;
if (blocks_submitted < blocks_read + readahead_blocks) {
if (blocks_submitted < 2 * max_bio_size >> bsize_shift) {
/* Keep at least one bio in flight */
continue;
}