On 29/10/2024 11:55, Yu Kuai wrote:
Hi,
在 2024/10/28 23:27, John Garry 写道:
Add proper bio_split() error handling. For any error, call
raid_end_bio_io() and return. Except for discard, where we end the bio
directly.
Signed-off-by: John Garry <john.g.garry@xxxxxxxxxx>
---
drivers/md/raid10.c | 47 ++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 46 insertions(+), 1 deletion(-)
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index f3bf1116794a..9c56b27b754a 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1159,6 +1159,7 @@ static void raid10_read_request(struct mddev
*mddev, struct bio *bio,
int slot = r10_bio->read_slot;
struct md_rdev *err_rdev = NULL;
gfp_t gfp = GFP_NOIO;
+ int error;
if (slot >= 0 && r10_bio->devs[slot].rdev) {
/*
@@ -1206,6 +1207,10 @@ static void raid10_read_request(struct mddev
*mddev, struct bio *bio,
if (max_sectors < bio_sectors(bio)) {
struct bio *split = bio_split(bio, max_sectors,
gfp, &conf->bio_split);
+ if (IS_ERR(split)) {
+ error = PTR_ERR(split);
+ goto err_handle;
+ }
bio_chain(split, bio);
allow_barrier(conf);
submit_bio_noacct(bio);
@@ -1236,6 +1241,12 @@ static void raid10_read_request(struct mddev
*mddev, struct bio *bio,
mddev_trace_remap(mddev, read_bio, r10_bio->sector);
submit_bio_noacct(read_bio);
return;
+err_handle:
+ atomic_dec(&rdev->nr_pending);
I just realized that for the raid1 patch, this is missed. read_balance()
from raid1 will increase nr_pending as well. :(
hmmm... I have the rdev_dec_pending() call for raid1 at the error label,
which does the appropriate nr_pending dec, right? Or not?
+
+ bio->bi_status = errno_to_blk_status(error);
+ set_bit(R10BIO_Uptodate, &r10_bio->state);
+ raid_end_bio_io(r10_bio);
}
static void raid10_write_one_disk(struct mddev *mddev, struct r10bio
*r10_bio,
@@ -1347,9 +1358,10 @@ static void raid10_write_request(struct mddev
*mddev, struct bio *bio,
struct r10bio *r10_bio)
{
struct r10conf *conf = mddev->private;
- int i;
+ int i, k;
sector_t sectors;
int max_sectors;
+ int error;
if ((mddev_is_clustered(mddev) &&
md_cluster_ops->area_resyncing(mddev, WRITE,
@@ -1482,6 +1494,10 @@ static void raid10_write_request(struct mddev
*mddev, struct bio *bio,
if (r10_bio->sectors < bio_sectors(bio)) {
struct bio *split = bio_split(bio, r10_bio->sectors,
GFP_NOIO, &conf->bio_split);
+ if (IS_ERR(split)) {
+ error = PTR_ERR(split);
+ goto err_handle;
+ }
bio_chain(split, bio);
allow_barrier(conf);
submit_bio_noacct(bio);
@@ -1503,6 +1519,25 @@ static void raid10_write_request(struct mddev
*mddev, struct bio *bio,
raid10_write_one_disk(mddev, r10_bio, bio, true, i);
}
one_write_done(r10_bio);
+ return;
+err_handle:
+ for (k = 0; k < i; k++) {
+ struct md_rdev *rdev, *rrdev;
+
+ rdev = conf->mirrors[k].rdev;
+ rrdev = conf->mirrors[k].replacement;
This looks wrong, r10_bio->devs[k].devnum should be used to deference
rdev from mirrors.
ok
+
+ if (rdev)
+ rdev_dec_pending(conf->mirrors[k].rdev, mddev);
+ if (rrdev)
+ rdev_dec_pending(conf->mirrors[k].rdev, mddev);
This is not correct for now, for the case that rdev is all BB in the
write range, continue will be reached in the loop and rrdev is skipped(
This doesn't look correct to skip rrdev). However, I'll suggest to use:
int d = r10_bio->devs[k].devnum;
if (r10_bio->devs[k].bio == NULL)
eh, should this be:
if (r10_bio->devs[k].bio != NULL)
rdev_dec_pending(conf->mirrors[d].rdev);
if (r10_bio->devs[k].repl_bio == NULL)
rdev_dec_pending(conf->mirrors[d].replacement);
+ r10_bio->devs[k].bio = NULL;
+ r10_bio->devs[k].repl_bio = NULL;
+ }
+
+ bio->bi_status = errno_to_blk_status(error);
+ set_bit(R10BIO_Uptodate, &r10_bio->state);
+ raid_end_bio_io(r10_bio);
Thanks,
John
