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authorChristoph Hellwig <hch@lst.de>2015-07-20 16:29:37 +0300
committerJens Axboe <axboe@fb.com>2015-07-29 17:55:15 +0300
commit4246a0b63bd8f56a1469b12eafeb875b1041a451 (patch)
tree3281bb158d658ef7f208ad380c0ecee600a5ab5e /block/bounce.c
parent0034af036554c39eefd14d835a8ec3496ac46712 (diff)
downloadlinux-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 'block/bounce.c')
-rw-r--r--block/bounce.c27
1 files changed, 14 insertions, 13 deletions
diff --git a/block/bounce.c b/block/bounce.c
index b17311227c12..f4db245b9f3a 100644
--- a/block/bounce.c
+++ b/block/bounce.c
@@ -123,7 +123,7 @@ static void copy_to_high_bio_irq(struct bio *to, struct bio *from)
}
}
-static void bounce_end_io(struct bio *bio, mempool_t *pool, int err)
+static void bounce_end_io(struct bio *bio, mempool_t *pool)
{
struct bio *bio_orig = bio->bi_private;
struct bio_vec *bvec, *org_vec;
@@ -141,39 +141,40 @@ static void bounce_end_io(struct bio *bio, mempool_t *pool, int err)
mempool_free(bvec->bv_page, pool);
}
- bio_endio(bio_orig, err);
+ bio_orig->bi_error = bio->bi_error;
+ bio_endio(bio_orig);
bio_put(bio);
}
-static void bounce_end_io_write(struct bio *bio, int err)
+static void bounce_end_io_write(struct bio *bio)
{
- bounce_end_io(bio, page_pool, err);
+ bounce_end_io(bio, page_pool);
}
-static void bounce_end_io_write_isa(struct bio *bio, int err)
+static void bounce_end_io_write_isa(struct bio *bio)
{
- bounce_end_io(bio, isa_page_pool, err);
+ bounce_end_io(bio, isa_page_pool);
}
-static void __bounce_end_io_read(struct bio *bio, mempool_t *pool, int err)
+static void __bounce_end_io_read(struct bio *bio, mempool_t *pool)
{
struct bio *bio_orig = bio->bi_private;
- if (test_bit(BIO_UPTODATE, &bio->bi_flags))
+ if (!bio->bi_error)
copy_to_high_bio_irq(bio_orig, bio);
- bounce_end_io(bio, pool, err);
+ bounce_end_io(bio, pool);
}
-static void bounce_end_io_read(struct bio *bio, int err)
+static void bounce_end_io_read(struct bio *bio)
{
- __bounce_end_io_read(bio, page_pool, err);
+ __bounce_end_io_read(bio, page_pool);
}
-static void bounce_end_io_read_isa(struct bio *bio, int err)
+static void bounce_end_io_read_isa(struct bio *bio)
{
- __bounce_end_io_read(bio, isa_page_pool, err);
+ __bounce_end_io_read(bio, isa_page_pool);
}
#ifdef CONFIG_NEED_BOUNCE_POOL