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block: add a bi_error field to struct bio

Bläddra i källkod 
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>
This commit is contained in:
Christoph Hellwig
2015-07-20 15:29:37 +02:00
committad av Jens Axboe
förälder 0034af0365
incheckning 4246a0b63b
95 ändrade filer med 622 tillägg och 682 borttagningar
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8
fs/jfs/jfs_metapage.c
Visa fil

@@ -276,11 +276,11 @@ static void last_read_complete(struct page *page)
unlock_page(page);
}
static void metapage_read_end_io(struct bio *bio, int err)
static void metapage_read_end_io(struct bio *bio)
{
struct page *page = bio->bi_private;
if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) {
if (bio->bi_error) {
printk(KERN_ERR "metapage_read_end_io: I/O error\n");
SetPageError(page);
}
@@ -331,13 +331,13 @@ static void last_write_complete(struct page *page)
end_page_writeback(page);
}
static void metapage_write_end_io(struct bio *bio, int err)
static void metapage_write_end_io(struct bio *bio)
{
struct page *page = bio->bi_private;
BUG_ON(!PagePrivate(page));
if (! test_bit(BIO_UPTODATE, &bio->bi_flags)) {
if (bio->bi_error) {
printk(KERN_ERR "metapage_write_end_io: I/O error\n");
SetPageError(page);
}