diff options
| author | Christoph Hellwig <hch@lst.de> | 2015-07-20 15:29:37 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-07-29 16:55:15 +0200 |
| commit | 4246a0b63bd8f56a1469b12eafeb875b1041a451 (patch) | |
| tree | 3281bb158d658ef7f208ad380c0ecee600a5ab5e /drivers/md/bcache/writeback.c | |
| parent | block: make /sys/block/<dev>/queue/discard_max_bytes writeable (diff) | |
| download | linux-4246a0b63bd8f56a1469b12eafeb875b1041a451.tar.xz linux-4246a0b63bd8f56a1469b12eafeb875b1041a451.zip | |
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/writeback.c')
| -rw-r--r-- | drivers/md/bcache/writeback.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c index f1986bcd1bf0..b4fc874c30fd 100644 --- a/drivers/md/bcache/writeback.c +++ b/drivers/md/bcache/writeback.c @@ -166,12 +166,12 @@ static void write_dirty_finish(struct closure *cl) closure_return_with_destructor(cl, dirty_io_destructor); } -static void dirty_endio(struct bio *bio, int error) +static void dirty_endio(struct bio *bio) { struct keybuf_key *w = bio->bi_private; struct dirty_io *io = w->private; - if (error) + if (bio->bi_error) SET_KEY_DIRTY(&w->key, false); closure_put(&io->cl); @@ -193,15 +193,15 @@ static void write_dirty(struct closure *cl) continue_at(cl, write_dirty_finish, system_wq); } -static void read_dirty_endio(struct bio *bio, int error) +static void read_dirty_endio(struct bio *bio) { struct keybuf_key *w = bio->bi_private; struct dirty_io *io = w->private; bch_count_io_errors(PTR_CACHE(io->dc->disk.c, &w->key, 0), - error, "reading dirty data from cache"); + bio->bi_error, "reading dirty data from cache"); - dirty_endio(bio, error); + dirty_endio(bio); } static void read_dirty_submit(struct closure *cl) |