Hi all,
raid5_mergeable_bvec() (q->merge_bvec_fn) checks for the rw-type and
makes decisions based on that if the bio is mergable or not. But so far
this value is only initialized on calling submit_bio(),
at least not by ext4 and xfs. I have not checked other file system so far.
Question 1: merge_bvec_fn is supposed to be removed, is is
still worth to fix the usage of merge_bvec_fn?
Question 2: If it is still supposed to be fixed, how do want to have
it? So far I have two patches for xfs and ext4 to set the rw type
directly there, but maybe bio_add_page should get an int rw_type
parameter and set bio->bi_rw itself?
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index d488f80..4cddc15 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -370,6 +370,7 @@ static int io_submit_init_bio(struct ext4_io_submit *io,
bio->bi_bdev = bh->b_bdev;
bio->bi_end_io = ext4_end_bio;
bio->bi_private = ext4_get_io_end(io->io_end);
+ bio->bi_rw |= io->io_op;
io->io_bio = bio;
io->io_next_block = bh->b_blocknr;
return 0;
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 71c8c9d..b48048f 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -401,7 +401,8 @@ xfs_submit_ioend_bio(
STATIC struct bio *
xfs_alloc_ioend_bio(
- struct buffer_head *bh)
+ struct buffer_head *bh,
+ struct writeback_control *wbc)
{
int nvecs = bio_get_nr_vecs(bh->b_bdev);
struct bio *bio = bio_alloc(GFP_NOIO, nvecs);
@@ -409,6 +410,7 @@ xfs_alloc_ioend_bio(
ASSERT(bio->bi_private == NULL);
bio->bi_sector = bh->b_blocknr * (bh->b_size >> 9);
bio->bi_bdev = bh->b_bdev;
+ bio->bi_rw |= (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE;
return bio;
}
@@ -511,7 +513,8 @@ xfs_submit_ioend(
if (!bio) {
retry:
- bio = xfs_alloc_ioend_bio(bh);
+ bio = xfs_alloc_ioend_bio(bh, wbc);
+
} else if (bh->b_blocknr != lastblock + 1) {
xfs_submit_ioend_bio(wbc, ioend, bio);
goto retry;
Thanks,
Bernd
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