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block: add a bi_error field to struct bio

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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 <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Reviewed-by: NeilBrown <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Christoph Hellwig 2015-07-20 15:29:37 +02:00 • committed by Jens Axboe
commit 4246a0b63b
95 changed files with 622 additions and 682 deletions
Download patch file Download diff file Expand all files Collapse all files

21
drivers/target/target_core_iblock.c
View file

@ -306,20 +306,13 @@ static void iblock_complete_cmd(struct se_cmd *cmd)
kfree(ibr);
}
static void iblock_bio_done(struct bio *bio, int err)
static void iblock_bio_done(struct bio *bio)
{
struct se_cmd *cmd = bio->bi_private;
struct iblock_req *ibr = cmd->priv;
/*
* Set -EIO if !BIO_UPTODATE and the passed is still err=0
*/
if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err)
err = -EIO;
if (err != 0) {
pr_err("test_bit(BIO_UPTODATE) failed for bio: %p,"
" err: %d\n", bio, err);
if (bio->bi_error) {
pr_err("bio error: %p, err: %d\n", bio, bio->bi_error);
/*
* Bump the ib_bio_err_cnt and release bio.
*/
@ -370,15 +363,15 @@ static void iblock_submit_bios(struct bio_list *list, int rw)
blk_finish_plug(&plug);
}
static void iblock_end_io_flush(struct bio *bio, int err)
static void iblock_end_io_flush(struct bio *bio)
{
struct se_cmd *cmd = bio->bi_private;
if (err)
pr_err("IBLOCK: cache flush failed: %d\n", err);
if (bio->bi_error)
pr_err("IBLOCK: cache flush failed: %d\n", bio->bi_error);
if (cmd) {
if (err)
if (bio->bi_error)
target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
else
target_complete_cmd(cmd, SAM_STAT_GOOD);

6
drivers/target/target_core_pscsi.c
View file

@ -852,7 +852,7 @@ static ssize_t pscsi_show_configfs_dev_params(struct se_device *dev, char *b)
return bl;
}
static void pscsi_bi_endio(struct bio *bio, int error)
static void pscsi_bi_endio(struct bio *bio)
{
bio_put(bio);
}
@ -973,7 +973,7 @@ fail:
while (*hbio) {
bio = *hbio;
*hbio = (*hbio)->bi_next;
bio_endio(bio, 0); /* XXX: should be error */
bio_endio(bio);
}
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
@ -1061,7 +1061,7 @@ fail_free_bio:
while (hbio) {
struct bio *bio = hbio;
hbio = hbio->bi_next;
bio_endio(bio, 0); /* XXX: should be error */
bio_endio(bio);
}
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
fail: