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authorChristoph Hellwig <hch@lst.de>2015-07-20 15:29:37 +0200
committerJens Axboe <axboe@fb.com>2015-07-29 08:55:15 -0600
commit4246a0b63bd8f56a1469b12eafeb875b1041a451 (patch)
tree3281bb158d658ef7f208ad380c0ecee600a5ab5e /fs/nfs/blocklayout
parent0034af036554c39eefd14d835a8ec3496ac46712 (diff)
downloadop-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 'fs/nfs/blocklayout')
-rw-r--r--fs/nfs/blocklayout/blocklayout.c14
1 files changed, 6 insertions, 8 deletions
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index d2554fe..9cd4eb3 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -116,7 +116,7 @@ bl_submit_bio(int rw, struct bio *bio)
static struct bio *
bl_alloc_init_bio(int npg, struct block_device *bdev, sector_t disk_sector,
- void (*end_io)(struct bio *, int err), struct parallel_io *par)
+ bio_end_io_t end_io, struct parallel_io *par)
{
struct bio *bio;
@@ -139,8 +139,7 @@ bl_alloc_init_bio(int npg, struct block_device *bdev, sector_t disk_sector,
static struct bio *
do_add_page_to_bio(struct bio *bio, int npg, int rw, sector_t isect,
struct page *page, struct pnfs_block_dev_map *map,
- struct pnfs_block_extent *be,
- void (*end_io)(struct bio *, int err),
+ struct pnfs_block_extent *be, bio_end_io_t end_io,
struct parallel_io *par, unsigned int offset, int *len)
{
struct pnfs_block_dev *dev =
@@ -183,11 +182,11 @@ retry:
return bio;
}
-static void bl_end_io_read(struct bio *bio, int err)
+static void bl_end_io_read(struct bio *bio)
{
struct parallel_io *par = bio->bi_private;
- if (err) {
+ if (bio->bi_error) {
struct nfs_pgio_header *header = par->data;
if (!header->pnfs_error)
@@ -316,13 +315,12 @@ out:
return PNFS_ATTEMPTED;
}
-static void bl_end_io_write(struct bio *bio, int err)
+static void bl_end_io_write(struct bio *bio)
{
struct parallel_io *par = bio->bi_private;
- const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct nfs_pgio_header *header = par->data;
- if (!uptodate) {
+ if (bio->bi_error) {
if (!header->pnfs_error)
header->pnfs_error = -EIO;
pnfs_set_lo_fail(header->lseg);
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