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| author | Christoph Hellwig <hch@lst.de> | 2015-07-20 15:29:37 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-07-29 08:55:15 -0600 |
| commit | 4246a0b63bd8f56a1469b12eafeb875b1041a451 (patch) | |
| tree | 3281bb158d658ef7f208ad380c0ecee600a5ab5e /arch | |
| parent | 0034af036554c39eefd14d835a8ec3496ac46712 (diff) | |
| download | op-kernel-dev-4246a0b63bd8f56a1469b12eafeb875b1041a451.zip op-kernel-dev-4246a0b63bd8f56a1469b12eafeb875b1041a451.tar.gz | |
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 'arch')
| -rw-r--r-- | arch/m68k/emu/nfblock.c | 2 | ||||
| -rw-r--r-- | arch/powerpc/sysdev/axonram.c | 2 | ||||
| -rw-r--r-- | arch/xtensa/platforms/iss/simdisk.c | 12 |
3 files changed, 5 insertions, 11 deletions
diff --git a/arch/m68k/emu/nfblock.c b/arch/m68k/emu/nfblock.c index 2d75ae2..f2a00c5 100644 --- a/arch/m68k/emu/nfblock.c +++ b/arch/m68k/emu/nfblock.c @@ -76,7 +76,7 @@ static void nfhd_make_request(struct request_queue *queue, struct bio *bio) bvec_to_phys(&bvec)); sec += len; } - bio_endio(bio, 0); + bio_endio(bio); } static int nfhd_getgeo(struct block_device *bdev, struct hd_geometry *geo) diff --git a/arch/powerpc/sysdev/axonram.c b/arch/powerpc/sysdev/axonram.c index ee90db1..f86250c 100644 --- a/arch/powerpc/sysdev/axonram.c +++ b/arch/powerpc/sysdev/axonram.c @@ -132,7 +132,7 @@ axon_ram_make_request(struct request_queue *queue, struct bio *bio) phys_mem += vec.bv_len; transfered += vec.bv_len; } - bio_endio(bio, 0); + bio_endio(bio); } /** diff --git a/arch/xtensa/platforms/iss/simdisk.c b/arch/xtensa/platforms/iss/simdisk.c index 48eebac..fa84ca9 100644 --- a/arch/xtensa/platforms/iss/simdisk.c +++ b/arch/xtensa/platforms/iss/simdisk.c @@ -101,8 +101,9 @@ static void simdisk_transfer(struct simdisk *dev, unsigned long sector, spin_unlock(&dev->lock); } -static int simdisk_xfer_bio(struct simdisk *dev, struct bio *bio) +static void simdisk_make_request(struct request_queue *q, struct bio *bio) { + struct simdisk *dev = q->queuedata; struct bio_vec bvec; struct bvec_iter iter; sector_t sector = bio->bi_iter.bi_sector; @@ -116,17 +117,10 @@ static int simdisk_xfer_bio(struct simdisk *dev, struct bio *bio) sector += len; __bio_kunmap_atomic(buffer); } - return 0; -} -static void simdisk_make_request(struct request_queue *q, struct bio *bio) -{ - struct simdisk *dev = q->queuedata; - int status = simdisk_xfer_bio(dev, bio); - bio_endio(bio, status); + bio_endio(bio); } - static int simdisk_open(struct block_device *bdev, fmode_t mode) { struct simdisk *dev = bdev->bd_disk->private_data; |
