diff options
| author | Christoph Hellwig <hch@lst.de> | 2015-07-20 16:29:37 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-07-29 17:55:15 +0300 |
| commit | 4246a0b63bd8f56a1469b12eafeb875b1041a451 (patch) | |
| tree | 3281bb158d658ef7f208ad380c0ecee600a5ab5e /drivers/md/bcache/movinggc.c | |
| parent | 0034af036554c39eefd14d835a8ec3496ac46712 (diff) | |
| download | linux-4246a0b63bd8f56a1469b12eafeb875b1041a451.tar.xz | |
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>
Diffstat (limited to 'drivers/md/bcache/movinggc.c')
| -rw-r--r-- | drivers/md/bcache/movinggc.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/md/bcache/movinggc.c b/drivers/md/bcache/movinggc.c index cd7490311e51..b929fc944e9c 100644 --- a/drivers/md/bcache/movinggc.c +++ b/drivers/md/bcache/movinggc.c @@ -60,20 +60,20 @@ static void write_moving_finish(struct closure *cl) closure_return_with_destructor(cl, moving_io_destructor); } -static void read_moving_endio(struct bio *bio, int error) +static void read_moving_endio(struct bio *bio) { struct bbio *b = container_of(bio, struct bbio, bio); struct moving_io *io = container_of(bio->bi_private, struct moving_io, cl); - if (error) - io->op.error = error; + if (bio->bi_error) + io->op.error = bio->bi_error; else if (!KEY_DIRTY(&b->key) && ptr_stale(io->op.c, &b->key, 0)) { io->op.error = -EINTR; } - bch_bbio_endio(io->op.c, bio, error, "reading data to move"); + bch_bbio_endio(io->op.c, bio, bio->bi_error, "reading data to move"); } static void moving_init(struct moving_io *io) |