block: add a bi_error field to struct bio
Currently we have two different ways to signal an I/O error on a BIO:
(1) by clearing the BIO_UPTODATE flag
(2) by returning a Linux errno value to the bi_end_io callback
The first one has the drawback of only communicating a single possible
error (-EIO), and the second one has the drawback of not beeing persistent
when bios are queued up, and are not passed along from child to parent
bio in the ever more popular chaining scenario. Having both mechanisms
available has the additional drawback of utterly confusing driver authors
and introducing bugs where various I/O submitters only deal with one of
them, and the others have to add boilerplate code to deal with both kinds
of error returns.
So add a new bi_error field to store an errno value directly in struct
bio and remove the existing mechanisms to clean all this up.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: NeilBrown <neilb@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/fs/logfs/dev_bdev.c b/fs/logfs/dev_bdev.c
index 76279e1..cea0cc9 100644
--- a/fs/logfs/dev_bdev.c
+++ b/fs/logfs/dev_bdev.c
@@ -53,16 +53,14 @@
static DECLARE_WAIT_QUEUE_HEAD(wq);
-static void writeseg_end_io(struct bio *bio, int err)
+static void writeseg_end_io(struct bio *bio)
{
- const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct bio_vec *bvec;
int i;
struct super_block *sb = bio->bi_private;
struct logfs_super *super = logfs_super(sb);
- BUG_ON(!uptodate); /* FIXME: Retry io or write elsewhere */
- BUG_ON(err);
+ BUG_ON(bio->bi_error); /* FIXME: Retry io or write elsewhere */
bio_for_each_segment_all(bvec, bio, i) {
end_page_writeback(bvec->bv_page);
@@ -153,14 +151,12 @@
}
-static void erase_end_io(struct bio *bio, int err)
+static void erase_end_io(struct bio *bio)
{
- const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct super_block *sb = bio->bi_private;
struct logfs_super *super = logfs_super(sb);
- BUG_ON(!uptodate); /* FIXME: Retry io or write elsewhere */
- BUG_ON(err);
+ BUG_ON(bio->bi_error); /* FIXME: Retry io or write elsewhere */
BUG_ON(bio->bi_vcnt == 0);
bio_put(bio);
if (atomic_dec_and_test(&super->s_pending_writes))