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gfs2: Fix extended attribute readahead optimization

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Commit 39b0555f 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 <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2016-08-16 13:25:22 +02:00 committed by Bob Peterson
parent 1c185c02f4
commit 23e5671a79
1 changed files with 18 additions and 15 deletions
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33
fs/gfs2/meta_io.c
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@ -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;
while (num > 0) {
struct buffer_head *bh = *bhs;
struct bio *bio;
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));
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);
}
/**