When exec bio_alloc, the bi_rw is zero.But after calling bio_add_page,
it will use bi_rw.
Fox example, in functiion __bio_add_page,it will call merge_bvec_fn().
The merge_bvec_fn of raid456 will use the bi_rw to judge the merge.
>> if ((bvm->bi_rw & 1) == WRITE)
>> return biovec->bv_len; /* always allow writes to be mergeable */
Jianpeng Ma (8):
Evalue bio->bi_rw after calling bio_alloc() and before calling
bio_add_page().
Evalue bio->bi_rw after calling bio_alloc() and before calling
bio_add_page().
Evalue bio->bi_rw after calling bio_alloc() and before calling
bio_add_page().
Evalue bio->bi_rw after calling bio_alloc() and before calling
bio_add_page().
Evalue bio->bi_rw after calling bio_alloc() and before calling
bio_add_page().
Evalue bio->bi_rw after calling bio_alloc() and before calling
bio_add_page().
Evalue bio->bi_rw after calling bio_alloc() and before calling
bio_add_page().
Evalue bio->bi_rw after calling bio_alloc() and before calling
bio_add_page().
block/blk-lib.c | 1 +
drivers/block/xen-blkback/blkback.c | 1 +
fs/btrfs/check-integrity.c | 1 +
fs/direct-io.c | 1 +
fs/ext4/page-io.c | 1 +
fs/jfs/jfs_metapage.c | 1 +
fs/ocfs2/cluster/heartbeat.c | 8 +++++---
fs/xfs/xfs_aops.c | 2 ++
fs/xfs/xfs_buf.c | 1 +
9 files changed, 14 insertions(+), 3 deletions(-)
--
1.7.9.5
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