* bcache detach lead to xfs force shutdown
@ 2022-02-21 9:33 Zhang Zhen
2022-02-23 9:03 ` Coly Li
0 siblings, 1 reply; 13+ messages in thread
From: Zhang Zhen @ 2022-02-21 9:33 UTC (permalink / raw)
To: colyli; +Cc: linux-bcache, jianchao.wan9
Hi coly，
We encounted a bcache detach problem, during the io process，the cache
device become missing.
The io error status returned to xfs， and in some case， the xfs do force
shutdown.
The dmesg as follows:
Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56: IO
error on writing btree.
Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p44: IO
error on writing btree.
Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p44: IO
error on writing btree.
Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57: IO
error on writing btree.
Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56: IO
error on writing btree.
Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57: IO
error on writing btree.
Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56: IO
error on writing btree.
Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in
"xfs_buf_iodone_callback_error" at daddr 0x80034658 len 32 error 12
Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() bcache: error on
004f8aa7-561a-4ba7-bf7b-292e461d3f18:
Feb 2 20:59:23 kernel: journal io error
Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() , disabling caching
Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
Feb 2 20:59:23 kernel: bcache: conditional_stop_bcache_device()
stop_when_cache_set_failed of bcache43 is "auto" and cache is clean,
keep it alive.
Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in
"xlog_iodone" at daddr 0x400123e60 len 64 error 12
Feb 2 20:59:23 kernel: XFS (bcache43): xfs_do_force_shutdown(0x2)
called from line 1298 of file fs/xfs/xfs_log.c. Return address =
00000000c1c8077f
Feb 2 20:59:23 kernel: XFS (bcache43): Log I/O Error Detected.
Shutting down filesystem
Feb 2 20:59:23 kernel: XFS (bcache43): Please unmount the filesystem
and rectify the problem(s)
We checked the code, the error status is returned in
cached_dev_make_request and closure_bio_submit function.
1180 static blk_qc_t cached_dev_make_request(struct request_queue *q,
1181 struct bio *bio)
1182 {
1183 struct search *s;
1184 struct bcache_device *d = bio->bi_disk->private_data;
1185 struct cached_dev *dc = container_of(d, struct cached_dev, disk);
1186 int rw = bio_data_dir(bio);
1187
1188 if (unlikely((d->c && test_bit(CACHE_SET_IO_DISABLE,
&d->c->flags)) ||
1189 dc->io_disable)) {
1190 bio->bi_status = BLK_STS_IOERR;
1191 bio_endio(bio);
1192 return BLK_QC_T_NONE;
1193 }
901 static inline void closure_bio_submit(struct cache_set *c,
902 struct bio *bio,
903 struct closure *cl)
904 {
905 closure_get(cl);
906 if (unlikely(test_bit(CACHE_SET_IO_DISABLE, &c->flags))) {
907 bio->bi_status = BLK_STS_IOERR;
908 bio_endio(bio);
909 return;
910 }
911 generic_make_request(bio);
912 }
Can the cache set detached and don't return error status to fs?
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: bcache detach lead to xfs force shutdown
2022-02-21 9:33 bcache detach lead to xfs force shutdown Zhang Zhen
@ 2022-02-23 9:03 ` Coly Li
2022-02-23 12:26 ` Zhang Zhen
0 siblings, 1 reply; 13+ messages in thread
From: Coly Li @ 2022-02-23 9:03 UTC (permalink / raw)
To: Zhang Zhen; +Cc: linux-bcache, jianchao.wan9
On 2/21/22 5:33 PM, Zhang Zhen wrote:
> Hi coly，
>
> We encounted a bcache detach problem, during the io process，the cache
> device become missing.
>
> The io error status returned to xfs， and in some case， the xfs do
> force shutdown.
>
> The dmesg as follows:
> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56: IO
> error on writing btree.
> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p44: IO
> error on writing btree.
> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p44: IO
> error on writing btree.
> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57: IO
> error on writing btree.
> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56: IO
> error on writing btree.
> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57: IO
> error on writing btree.
> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56: IO
> error on writing btree.
> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
> Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in
> "xfs_buf_iodone_callback_error" at daddr 0x80034658 len 32 error 12
> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
> Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() bcache: error
> on 004f8aa7-561a-4ba7-bf7b-292e461d3f18:
> Feb 2 20:59:23 kernel: journal io error
> Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() , disabling
> caching
> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
> Feb 2 20:59:23 kernel: bcache: conditional_stop_bcache_device()
> stop_when_cache_set_failed of bcache43 is "auto" and cache is clean,
> keep it alive.
> Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in
> "xlog_iodone" at daddr 0x400123e60 len 64 error 12
> Feb 2 20:59:23 kernel: XFS (bcache43): xfs_do_force_shutdown(0x2)
> called from line 1298 of file fs/xfs/xfs_log.c. Return address =
> 00000000c1c8077f
> Feb 2 20:59:23 kernel: XFS (bcache43): Log I/O Error Detected.
> Shutting down filesystem
> Feb 2 20:59:23 kernel: XFS (bcache43): Please unmount the filesystem
> and rectify the problem(s)
>
>
> We checked the code, the error status is returned in
> cached_dev_make_request and closure_bio_submit function.
>
> 1180 static blk_qc_t cached_dev_make_request(struct request_queue *q,
> 1181 struct bio *bio)
> 1182 {
> 1183 struct search *s;
> 1184 struct bcache_device *d = bio->bi_disk->private_data;
> 1185 struct cached_dev *dc = container_of(d, struct cached_dev,
> disk);
> 1186 int rw = bio_data_dir(bio);
> 1187
> 1188 if (unlikely((d->c && test_bit(CACHE_SET_IO_DISABLE,
> &d->c->flags)) ||
> 1189 dc->io_disable)) {
> 1190 bio->bi_status = BLK_STS_IOERR;
> 1191 bio_endio(bio);
> 1192 return BLK_QC_T_NONE;
> 1193 }
>
> 901 static inline void closure_bio_submit(struct cache_set *c,
> 902 struct bio *bio,
> 903 struct closure *cl)
> 904 {
> 905 closure_get(cl);
> 906 if (unlikely(test_bit(CACHE_SET_IO_DISABLE, &c->flags))) {
> 907 bio->bi_status = BLK_STS_IOERR;
> 908 bio_endio(bio);
> 909 return;
> 910 }
> 911 generic_make_request(bio);
> 912 }
>
> Can the cache set detached and don't return error status to fs?
Hi Zhang,
What is your kernel version and where do you get the kernel?
It seems like an as designed behavior, could you please describe more
detail about the operation sequence?
Thanks.
Coly Li
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: bcache detach lead to xfs force shutdown
2022-02-23 9:03 ` Coly Li
@ 2022-02-23 12:26 ` Zhang Zhen
2022-03-02 9:19 ` Coly Li
2022-03-09 13:14 ` bcache detach lead to xfs force shutdown Coly Li
0 siblings, 2 replies; 13+ messages in thread
From: Zhang Zhen @ 2022-02-23 12:26 UTC (permalink / raw)
To: Coly Li; +Cc: linux-bcache, jianchao.wan9
[-- Attachment #1: Type: text/plain, Size: 4657 bytes --]
在 2022/2/23 下午5:03, Coly Li 写道:
> On 2/21/22 5:33 PM, Zhang Zhen wrote:
>> Hi coly，
>>
>> We encounted a bcache detach problem, during the io process，the cache
>> device become missing.
>>
>> The io error status returned to xfs， and in some case， the xfs do
>> force shutdown.
>>
>> The dmesg as follows:
>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56: IO
>> error on writing btree.
>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p44: IO
>> error on writing btree.
>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p44: IO
>> error on writing btree.
>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57: IO
>> error on writing btree.
>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56: IO
>> error on writing btree.
>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57: IO
>> error on writing btree.
>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56: IO
>> error on writing btree.
>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>> Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in
>> "xfs_buf_iodone_callback_error" at daddr 0x80034658 len 32 error 12
>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>> Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() bcache: error
>> on 004f8aa7-561a-4ba7-bf7b-292e461d3f18:
>> Feb 2 20:59:23 kernel: journal io error
>> Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() , disabling
>> caching
>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>> Feb 2 20:59:23 kernel: bcache: conditional_stop_bcache_device()
>> stop_when_cache_set_failed of bcache43 is "auto" and cache is clean,
>> keep it alive.
>> Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in
>> "xlog_iodone" at daddr 0x400123e60 len 64 error 12
>> Feb 2 20:59:23 kernel: XFS (bcache43): xfs_do_force_shutdown(0x2)
>> called from line 1298 of file fs/xfs/xfs_log.c. Return address =
>> 00000000c1c8077f
>> Feb 2 20:59:23 kernel: XFS (bcache43): Log I/O Error Detected.
>> Shutting down filesystem
>> Feb 2 20:59:23 kernel: XFS (bcache43): Please unmount the filesystem
>> and rectify the problem(s)
>>
>>
>> We checked the code, the error status is returned in
>> cached_dev_make_request and closure_bio_submit function.
>>
>> 1180 static blk_qc_t cached_dev_make_request(struct request_queue *q,
>> 1181 struct bio *bio)
>> 1182 {
>> 1183 struct search *s;
>> 1184 struct bcache_device *d = bio->bi_disk->private_data;
>> 1185 struct cached_dev *dc = container_of(d, struct cached_dev,
>> disk);
>> 1186 int rw = bio_data_dir(bio);
>> 1187
>> 1188 if (unlikely((d->c && test_bit(CACHE_SET_IO_DISABLE,
>> &d->c->flags)) ||
>> 1189 dc->io_disable)) {
>> 1190 bio->bi_status = BLK_STS_IOERR;
>> 1191 bio_endio(bio);
>> 1192 return BLK_QC_T_NONE;
>> 1193 }
>>
>> 901 static inline void closure_bio_submit(struct cache_set *c,
>> 902 struct bio *bio,
>> 903 struct closure *cl)
>> 904 {
>> 905 closure_get(cl);
>> 906 if (unlikely(test_bit(CACHE_SET_IO_DISABLE, &c->flags))) {
>> 907 bio->bi_status = BLK_STS_IOERR;
>> 908 bio_endio(bio);
>> 909 return;
>> 910 }
>> 911 generic_make_request(bio);
>> 912 }
>>
>> Can the cache set detached and don't return error status to fs?
>
>
> Hi Zhang,
>
>
> What is your kernel version and where do you get the kernel?
> My kernel version is 4.18 of Centos.
The code of this part is same with upstream kernel.
> It seems like an as designed behavior, could you please describe more
> detail about the operation sequence?
>
Yes, i think so too.
The reproduce opreation as follows:
1. mount a bcache disk with xfs
/dev/bcache1 on /media/disk1 type xfs
2. run ls in background
#!/bin/bash
while true
do
echo 2 > /proc/sys/vm/drop_caches
ls -R /media/disk1 > /dev/null
done
3. remove cache disk sdc
echo 1 >/sys/block/sdc/device/delete
4. dmesg should get xfs error
I write a patch to improve，please help to review it, thanks.
>
> Thanks.
>
>
> Coly Li
>
[-- Attachment #2: 0001-Bcache-don-t-return-BLK_STS_IOERR-during-cache-detac.patch --]
[-- Type: text/plain, Size: 4223 bytes --]
From cb4dff3092707a31017cb3736be39039ece0e646 Mon Sep 17 00:00:00 2001
From: Zhen Zhang <zhangzhen.email@gmail.com>
Date: Wed, 23 Feb 2022 03:40:29 -0800
Subject: [PATCH] Bcache: don't return BLK_STS_IOERR during cache detach
Before this patch, if cache device missing, cached_dev_submit_bio return io err
to fs during cache detach, randomly lead to xfs do force shutdown.
This patch delay the cache io submit in cached_dev_submit_bio
and wait for cache set detach finish.
So if the cache device become missing, bcache detach cache set automatically,
and the io will sumbit normally.
Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56: IO error on writing btree.
Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57: IO error on writing btree.
Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56: IO error on writing btree.
Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in "xfs_buf_iodone_callback_error" at daddr 0x80034658 len 32 error 12
Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() bcache: error on 004f8aa7-561a-4ba7-bf7b-292e461d3f18:
Feb 2 20:59:23 kernel: journal io error
Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() , disabling caching
Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
Feb 2 20:59:23 kernel: bcache: conditional_stop_bcache_device() stop_when_cache_set_failed of bcache43 is "auto" and cache is clean, keep it alive.
Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in "xlog_iodone" at daddr 0x400123e60 len 64 error 12
Feb 2 20:59:23 kernel: XFS (bcache43): xfs_do_force_shutdown(0x2) called from line 1298 of file fs/xfs/xfs_log.c. Return address = 00000000c1c8077f
Feb 2 20:59:23 kernel: XFS (bcache43): Log I/O Error Detected. Shutting down filesystem
Feb 2 20:59:23 kernel: XFS (bcache43): Please unmount the filesystem and rectify the problem(s)
Signed-off-by: Zhen Zhang <zhangzhen.email@gmail.com>
---
drivers/md/bcache/bcache.h | 5 -----
drivers/md/bcache/request.c | 8 ++++----
drivers/md/bcache/super.c | 3 ++-
3 files changed, 6 insertions(+), 10 deletions(-)
diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
index 9ed9c955add7..e5227dd08e3a 100644
--- a/drivers/md/bcache/bcache.h
+++ b/drivers/md/bcache/bcache.h
@@ -928,11 +928,6 @@ static inline void closure_bio_submit(struct cache_set *c,
struct closure *cl)
{
closure_get(cl);
- if (unlikely(test_bit(CACHE_SET_IO_DISABLE, &c->flags))) {
- bio->bi_status = BLK_STS_IOERR;
- bio_endio(bio);
- return;
- }
submit_bio_noacct(bio);
}
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index d15aae6c51c1..36f0ee95b51f 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -13,6 +13,7 @@
#include "request.h"
#include "writeback.h"
+#include <linux/delay.h>
#include <linux/module.h>
#include <linux/hash.h>
#include <linux/random.h>
@@ -1172,11 +1173,10 @@ void cached_dev_submit_bio(struct bio *bio)
unsigned long start_time;
int rw = bio_data_dir(bio);
- if (unlikely((d->c && test_bit(CACHE_SET_IO_DISABLE, &d->c->flags)) ||
+ while (unlikely((d->c && test_bit(CACHE_SET_IO_DISABLE, &d->c->flags)) ||
dc->io_disable)) {
- bio->bi_status = BLK_STS_IOERR;
- bio_endio(bio);
- return;
+ /* wait for detach finish and d->c == NULL. */
+ msleep(2);
}
if (likely(d->c)) {
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 140f35dc0c45..8d9a5e937bc8 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -661,7 +661,8 @@ int bch_prio_write(struct cache *ca, bool wait)
p->csum = bch_crc64(&p->magic, meta_bucket_bytes(&ca->sb) - 8);
bucket = bch_bucket_alloc(ca, RESERVE_PRIO, wait);
- BUG_ON(bucket == -1);
+ if (bucket == -1)
+ return -1;
mutex_unlock(&ca->set->bucket_lock);
prio_io(ca, bucket, REQ_OP_WRITE, 0);
--
2.25.1
^ permalink raw reply related [flat|nested] 13+ messages in thread
* Re: bcache detach lead to xfs force shutdown
2022-02-23 12:26 ` Zhang Zhen
@ 2022-03-02 9:19 ` Coly Li
2022-03-03 17:42 ` Nix
2022-03-04 8:22 ` Zhang Zhen
2022-03-09 13:14 ` bcache detach lead to xfs force shutdown Coly Li
1 sibling, 2 replies; 13+ messages in thread
From: Coly Li @ 2022-03-02 9:19 UTC (permalink / raw)
To: Zhang Zhen; +Cc: linux-bcache, jianchao.wan9
On 2/23/22 8:26 PM, Zhang Zhen wrote:
>
> 在 2022/2/23 下午5:03, Coly Li 写道:
>> On 2/21/22 5:33 PM, Zhang Zhen wrote:
>>> Hi coly，
>>>
>>> We encounted a bcache detach problem, during the io process，the
>>> cache device become missing.
>>>
>>> The io error status returned to xfs， and in some case， the xfs do
>>> force shutdown.
>>>
>>> The dmesg as follows:
>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56:
>>> IO error on writing btree.
>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p44:
>>> IO error on writing btree.
>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p44:
>>> IO error on writing btree.
>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57:
>>> IO error on writing btree.
>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56:
>>> IO error on writing btree.
>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57:
>>> IO error on writing btree.
>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56:
>>> IO error on writing btree.
>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>> Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in
>>> "xfs_buf_iodone_callback_error" at daddr 0x80034658 len 32 error 12
>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>> Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() bcache: error
>>> on 004f8aa7-561a-4ba7-bf7b-292e461d3f18:
>>> Feb 2 20:59:23 kernel: journal io error
>>> Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() , disabling
>>> caching
>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>> Feb 2 20:59:23 kernel: bcache: conditional_stop_bcache_device()
>>> stop_when_cache_set_failed of bcache43 is "auto" and cache is clean,
>>> keep it alive.
>>> Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in
>>> "xlog_iodone" at daddr 0x400123e60 len 64 error 12
>>> Feb 2 20:59:23 kernel: XFS (bcache43): xfs_do_force_shutdown(0x2)
>>> called from line 1298 of file fs/xfs/xfs_log.c. Return address =
>>> 00000000c1c8077f
>>> Feb 2 20:59:23 kernel: XFS (bcache43): Log I/O Error Detected.
>>> Shutting down filesystem
>>> Feb 2 20:59:23 kernel: XFS (bcache43): Please unmount the
>>> filesystem and rectify the problem(s)
>>>
>>>
>>> We checked the code, the error status is returned in
>>> cached_dev_make_request and closure_bio_submit function.
>>>
>>> 1180 static blk_qc_t cached_dev_make_request(struct request_queue *q,
>>> 1181 struct bio *bio)
>>> 1182 {
>>> 1183 struct search *s;
>>> 1184 struct bcache_device *d = bio->bi_disk->private_data;
>>> 1185 struct cached_dev *dc = container_of(d, struct cached_dev,
>>> disk);
>>> 1186 int rw = bio_data_dir(bio);
>>> 1187
>>> 1188 if (unlikely((d->c && test_bit(CACHE_SET_IO_DISABLE,
>>> &d->c->flags)) ||
>>> 1189 dc->io_disable)) {
>>> 1190 bio->bi_status = BLK_STS_IOERR;
>>> 1191 bio_endio(bio);
>>> 1192 return BLK_QC_T_NONE;
>>> 1193 }
>>>
>>> 901 static inline void closure_bio_submit(struct cache_set *c,
>>> 902 struct bio *bio,
>>> 903 struct closure *cl)
>>> 904 {
>>> 905 closure_get(cl);
>>> 906 if (unlikely(test_bit(CACHE_SET_IO_DISABLE, &c->flags))) {
>>> 907 bio->bi_status = BLK_STS_IOERR;
>>> 908 bio_endio(bio);
>>> 909 return;
>>> 910 }
>>> 911 generic_make_request(bio);
>>> 912 }
>>>
>>> Can the cache set detached and don't return error status to fs?
>>
>>
>> Hi Zhang,
>>
>>
>> What is your kernel version and where do you get the kernel?
>> My kernel version is 4.18 of Centos.
> The code of this part is same with upstream kernel.
>> It seems like an as designed behavior, could you please describe more
>> detail about the operation sequence?
>>
> Yes, i think so too.
> The reproduce opreation as follows:
> 1. mount a bcache disk with xfs
>
> /dev/bcache1 on /media/disk1 type xfs
>
> 2. run ls in background
> #!/bin/bash
>
> while true
> do
> echo 2 > /proc/sys/vm/drop_caches
> ls -R /media/disk1 > /dev/null
> done
>
>
> 3. remove cache disk sdc
> echo 1 >/sys/block/sdc/device/delete
>
> 4. dmesg should get xfs error
>
> I write a patch to improve，please help to review it, thanks.
Hold on. Why do you think it should be fixed? As I said, it is
as-designed behavior.
Coly Li
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: bcache detach lead to xfs force shutdown
2022-03-02 9:19 ` Coly Li
@ 2022-03-03 17:42 ` Nix
2022-03-04 8:22 ` Zhang Zhen
1 sibling, 0 replies; 13+ messages in thread
From: Nix @ 2022-03-03 17:42 UTC (permalink / raw)
To: Coly Li; +Cc: Zhang Zhen, linux-bcache, jianchao.wan9
On 2 Mar 2022, Coly Li verbalised:
> On 2/23/22 8:26 PM, Zhang Zhen wrote:
>> The reproduce opreation as follows:
>> 1. mount a bcache disk with xfs
>>
>> /dev/bcache1 on /media/disk1 type xfs
>>
>> 2. run ls in background
>> #!/bin/bash
>>
>> while true
>> do
>> echo 2 > /proc/sys/vm/drop_caches
>> ls -R /media/disk1 > /dev/null
>> done
>>
>>
>> 3. remove cache disk sdc
>> echo 1 >/sys/block/sdc/device/delete
>>
>> 4. dmesg should get xfs error
>>
>> I write a patch to improve，please help to review it, thanks.
>
> Hold on. Why do you think it should be fixed? As I said, it is as-designed behavior.
I was thinking exactly as you were... but, y'know, this might be a
genuine resiliency improvement, *if* done only when the cache is
writearound (or none, I suppose!). Obviously if writes are being cached
a cache device failure must trigger I/O failures visible to userspace...
but if it's just speeding up the underlying device, having it fail would
ideally just fail it out and cause all I/Os to proceed uncached,
including the one that was underway when the cache I/O error was
encountered.
--
NULL && (void)
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: bcache detach lead to xfs force shutdown
2022-03-02 9:19 ` Coly Li
2022-03-03 17:42 ` Nix
@ 2022-03-04 8:22 ` Zhang Zhen
2022-03-04 8:42 ` Coly Li
1 sibling, 1 reply; 13+ messages in thread
From: Zhang Zhen @ 2022-03-04 8:22 UTC (permalink / raw)
To: Coly Li; +Cc: linux-bcache, jianchao.wan9
On 3/2/22 5:19 PM, Coly Li wrote:
> On 2/23/22 8:26 PM, Zhang Zhen wrote:
>>
>> 在 2022/2/23 下午5:03, Coly Li 写道:
>>> On 2/21/22 5:33 PM, Zhang Zhen wrote:
>>>> Hi coly，
>>>>
>>>> We encounted a bcache detach problem, during the io process，the
>>>> cache device become missing.
>>>>
>>>> The io error status returned to xfs， and in some case， the xfs do
>>>> force shutdown.
>>>>
>>>> The dmesg as follows:
>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56:
>>>> IO error on writing btree.
>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p44:
>>>> IO error on writing btree.
>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p44:
>>>> IO error on writing btree.
>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57:
>>>> IO error on writing btree.
>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56:
>>>> IO error on writing btree.
>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57:
>>>> IO error on writing btree.
>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56:
>>>> IO error on writing btree.
>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>>> Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in
>>>> "xfs_buf_iodone_callback_error" at daddr 0x80034658 len 32 error 12
>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>>> Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() bcache: error
>>>> on 004f8aa7-561a-4ba7-bf7b-292e461d3f18:
>>>> Feb 2 20:59:23 kernel: journal io error
>>>> Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() , disabling
>>>> caching
>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>>> Feb 2 20:59:23 kernel: bcache: conditional_stop_bcache_device()
>>>> stop_when_cache_set_failed of bcache43 is "auto" and cache is clean,
>>>> keep it alive.
>>>> Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in
>>>> "xlog_iodone" at daddr 0x400123e60 len 64 error 12
>>>> Feb 2 20:59:23 kernel: XFS (bcache43): xfs_do_force_shutdown(0x2)
>>>> called from line 1298 of file fs/xfs/xfs_log.c. Return address =
>>>> 00000000c1c8077f
>>>> Feb 2 20:59:23 kernel: XFS (bcache43): Log I/O Error Detected.
>>>> Shutting down filesystem
>>>> Feb 2 20:59:23 kernel: XFS (bcache43): Please unmount the
>>>> filesystem and rectify the problem(s)
>>>>
>>>>
>>>> We checked the code, the error status is returned in
>>>> cached_dev_make_request and closure_bio_submit function.
>>>>
>>>> 1180 static blk_qc_t cached_dev_make_request(struct request_queue *q,
>>>> 1181 struct bio *bio)
>>>> 1182 {
>>>> 1183 struct search *s;
>>>> 1184 struct bcache_device *d = bio->bi_disk->private_data;
>>>> 1185 struct cached_dev *dc = container_of(d, struct cached_dev,
>>>> disk);
>>>> 1186 int rw = bio_data_dir(bio);
>>>> 1187
>>>> 1188 if (unlikely((d->c && test_bit(CACHE_SET_IO_DISABLE,
>>>> &d->c->flags)) ||
>>>> 1189 dc->io_disable)) {
>>>> 1190 bio->bi_status = BLK_STS_IOERR;
>>>> 1191 bio_endio(bio);
>>>> 1192 return BLK_QC_T_NONE;
>>>> 1193 }
>>>>
>>>> 901 static inline void closure_bio_submit(struct cache_set *c,
>>>> 902 struct bio *bio,
>>>> 903 struct closure *cl)
>>>> 904 {
>>>> 905 closure_get(cl);
>>>> 906 if (unlikely(test_bit(CACHE_SET_IO_DISABLE, &c->flags))) {
>>>> 907 bio->bi_status = BLK_STS_IOERR;
>>>> 908 bio_endio(bio);
>>>> 909 return;
>>>> 910 }
>>>> 911 generic_make_request(bio);
>>>> 912 }
>>>>
>>>> Can the cache set detached and don't return error status to fs?
>>>
>>>
>>> Hi Zhang,
>>>
>>>
>>> What is your kernel version and where do you get the kernel?
>>> My kernel version is 4.18 of Centos.
>> The code of this part is same with upstream kernel.
>>> It seems like an as designed behavior, could you please describe more
>>> detail about the operation sequence?
>>>
>> Yes, i think so too.
>> The reproduce opreation as follows:
>> 1. mount a bcache disk with xfs
>>
>> /dev/bcache1 on /media/disk1 type xfs
>>
>> 2. run ls in background
>> #!/bin/bash
>>
>> while true
>> do
>> echo 2 > /proc/sys/vm/drop_caches
>> ls -R /media/disk1 > /dev/null
>> done
>>
>>
>> 3. remove cache disk sdc
>> echo 1 >/sys/block/sdc/device/delete
>>
>> 4. dmesg should get xfs error
>>
>> I write a patch to improve，please help to review it, thanks.
>
> Hold on. Why do you think it should be fixed? As I said, it is
> as-designed behavior.
>
We use bcache in writearound mode, just cache read io.
Currently, bcache return io error during detach, randomly lead to
xfs force shutdown.
After bcache auto detach finished, some dir read write normaly, but
the others can't read write because of xfs force shutdown.
This inconsistency confuses filesystem users.
Thanks.
>
> Coly Li
>
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: bcache detach lead to xfs force shutdown
2022-03-04 8:22 ` Zhang Zhen
@ 2022-03-04 8:42 ` Coly Li
2022-03-07 7:56 ` zhangzhen.email
0 siblings, 1 reply; 13+ messages in thread
From: Coly Li @ 2022-03-04 8:42 UTC (permalink / raw)
To: Zhang Zhen, Nix; +Cc: linux-bcache, jianchao.wan9
On 3/4/22 4:22 PM, Zhang Zhen wrote:
>
> On 3/2/22 5:19 PM, Coly Li wrote:
>> On 2/23/22 8:26 PM, Zhang Zhen wrote:
>>>
>>> 在 2022/2/23 下午5:03, Coly Li 写道:
>>>> On 2/21/22 5:33 PM, Zhang Zhen wrote:
>>>>> Hi coly，
>>>>>
>>>>> We encounted a bcache detach problem, during the io process，the
>>>>> cache device become missing.
>>>>>
>>>>> The io error status returned to xfs， and in some case， the xfs do
>>>>> force shutdown.
>>>>>
>>>>> The dmesg as follows:
>>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56:
>>>>> IO error on writing btree.
>>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p44:
>>>>> IO error on writing btree.
>>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p44:
>>>>> IO error on writing btree.
>>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57:
>>>>> IO error on writing btree.
>>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56:
>>>>> IO error on writing btree.
>>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57:
>>>>> IO error on writing btree.
>>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56:
>>>>> IO error on writing btree.
>>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>>>> Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in
>>>>> "xfs_buf_iodone_callback_error" at daddr 0x80034658 len 32 error 12
>>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>>>> Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() bcache:
>>>>> error on 004f8aa7-561a-4ba7-bf7b-292e461d3f18:
>>>>> Feb 2 20:59:23 kernel: journal io error
>>>>> Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() , disabling
>>>>> caching
>>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>>>> Feb 2 20:59:23 kernel: bcache: conditional_stop_bcache_device()
>>>>> stop_when_cache_set_failed of bcache43 is "auto" and cache is
>>>>> clean, keep it alive.
>>>>> Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in
>>>>> "xlog_iodone" at daddr 0x400123e60 len 64 error 12
>>>>> Feb 2 20:59:23 kernel: XFS (bcache43):
>>>>> xfs_do_force_shutdown(0x2) called from line 1298 of file
>>>>> fs/xfs/xfs_log.c. Return address = 00000000c1c8077f
>>>>> Feb 2 20:59:23 kernel: XFS (bcache43): Log I/O Error Detected.
>>>>> Shutting down filesystem
>>>>> Feb 2 20:59:23 kernel: XFS (bcache43): Please unmount the
>>>>> filesystem and rectify the problem(s)
>>>>>
>>>>>
>>>>> We checked the code, the error status is returned in
>>>>> cached_dev_make_request and closure_bio_submit function.
>>>>>
>>>>> 1180 static blk_qc_t cached_dev_make_request(struct request_queue *q,
>>>>> 1181 struct bio *bio)
>>>>> 1182 {
>>>>> 1183 struct search *s;
>>>>> 1184 struct bcache_device *d = bio->bi_disk->private_data;
>>>>> 1185 struct cached_dev *dc = container_of(d, struct
>>>>> cached_dev, disk);
>>>>> 1186 int rw = bio_data_dir(bio);
>>>>> 1187
>>>>> 1188 if (unlikely((d->c && test_bit(CACHE_SET_IO_DISABLE,
>>>>> &d->c->flags)) ||
>>>>> 1189 dc->io_disable)) {
>>>>> 1190 bio->bi_status = BLK_STS_IOERR;
>>>>> 1191 bio_endio(bio);
>>>>> 1192 return BLK_QC_T_NONE;
>>>>> 1193 }
>>>>>
>>>>> 901 static inline void closure_bio_submit(struct cache_set *c,
>>>>> 902 struct bio *bio,
>>>>> 903 struct closure *cl)
>>>>> 904 {
>>>>> 905 closure_get(cl);
>>>>> 906 if (unlikely(test_bit(CACHE_SET_IO_DISABLE, &c->flags))) {
>>>>> 907 bio->bi_status = BLK_STS_IOERR;
>>>>> 908 bio_endio(bio);
>>>>> 909 return;
>>>>> 910 }
>>>>> 911 generic_make_request(bio);
>>>>> 912 }
>>>>>
>>>>> Can the cache set detached and don't return error status to fs?
>>>>
>>>>
>>>> Hi Zhang,
>>>>
>>>>
>>>> What is your kernel version and where do you get the kernel?
>>>> My kernel version is 4.18 of Centos.
>>> The code of this part is same with upstream kernel.
>>>> It seems like an as designed behavior, could you please describe
>>>> more detail about the operation sequence?
>>>>
>>> Yes, i think so too.
>>> The reproduce opreation as follows:
>>> 1. mount a bcache disk with xfs
>>>
>>> /dev/bcache1 on /media/disk1 type xfs
>>>
>>> 2. run ls in background
>>> #!/bin/bash
>>>
>>> while true
>>> do
>>> echo 2 > /proc/sys/vm/drop_caches
>>> ls -R /media/disk1 > /dev/null
>>> done
>>>
>>>
>>> 3. remove cache disk sdc
>>> echo 1 >/sys/block/sdc/device/delete
>>>
>>> 4. dmesg should get xfs error
>>>
>>> I write a patch to improve，please help to review it, thanks.
>
>>
>> Hold on. Why do you think it should be fixed? As I said, it is
>> as-designed behavior.
>>
> We use bcache in writearound mode, just cache read io.
> Currently, bcache return io error during detach, randomly lead to
> xfs force shutdown.
>
> After bcache auto detach finished, some dir read write normaly, but
> the others can't read write because of xfs force shutdown.
> This inconsistency confuses filesystem users.
Hi Zhen and Nix,
OK, I come to realize the motivation. Yes you are right, this is an
awkward issue and good to be fixed.
Coly Li
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: bcache detach lead to xfs force shutdown
2022-03-04 8:42 ` Coly Li
@ 2022-03-07 7:56 ` zhangzhen.email
2022-03-07 8:21 ` Coly Li
0 siblings, 1 reply; 13+ messages in thread
From: zhangzhen.email @ 2022-03-07 7:56 UTC (permalink / raw)
To: Coly Li, Nix, linux-bcache, jianchao.wan9
On 3/4/22 4:42 PM, Coly Li <colyli@suse.de> wrote:
> On 3/4/22 4:22 PM, Zhang Zhen wrote:
> >
> > On 3/2/22 5:19 PM, Coly Li wrote:
> >> On 2/23/22 8:26 PM, Zhang Zhen wrote:
> >>>
> >>> 在 2022/2/23 下午5:03, Coly Li 写道:
> >>>> On 2/21/22 5:33 PM, Zhang Zhen wrote:
> >>>>> Hi coly，
> >>>>>
> >>>>> We encounted a bcache detach problem, during the io process，the
> >>>>> cache device become missing.
> >>>>>
> >>>>> The io error status returned to xfs， and in some case， the xfs
> >>>>> do force shutdown.
> >>>>>
> >>>>> The dmesg as follows:
> >>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56:
> >>>>> IO error on writing btree.
> >>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p44:
> >>>>> IO error on writing btree.
> >>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p44:
> >>>>> IO error on writing btree.
> >>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57:
> >>>>> IO error on writing btree.
> >>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56:
> >>>>> IO error on writing btree.
> >>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57:
> >>>>> IO error on writing btree.
> >>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56:
> >>>>> IO error on writing btree.
> >>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
> >>>>> Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in
> >>>>> "xfs_buf_iodone_callback_error" at daddr 0x80034658 len 32 error 12
> >>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
> >>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
> >>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
> >>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
> >>>>> Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() bcache:
> >>>>> error on 004f8aa7-561a-4ba7-bf7b-292e461d3f18:
> >>>>> Feb 2 20:59:23 kernel: journal io error
> >>>>> Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() , disabling
> >>>>> caching
> >>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
> >>>>> Feb 2 20:59:23 kernel: bcache: conditional_stop_bcache_device()
> >>>>> stop_when_cache_set_failed of bcache43 is "auto" and cache is
> >>>>> clean, keep it alive.
> >>>>> Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in
> >>>>> "xlog_iodone" at daddr 0x400123e60 len 64 error 12
> >>>>> Feb 2 20:59:23 kernel: XFS (bcache43):
> >>>>> xfs_do_force_shutdown(0x2) called from line 1298 of file
> >>>>> fs/xfs/xfs_log.c. Return address = 00000000c1c8077f
> >>>>> Feb 2 20:59:23 kernel: XFS (bcache43): Log I/O Error Detected.
> >>>>> Shutting down filesystem
> >>>>> Feb 2 20:59:23 kernel: XFS (bcache43): Please unmount the
> >>>>> filesystem and rectify the problem(s)
> >>>>>
> >>>>>
> >>>>> We checked the code, the error status is returned in
> >>>>> cached_dev_make_request and closure_bio_submit function.
> >>>>>
> >>>>> 1180 static blk_qc_t cached_dev_make_request(struct request_queue *q,
> >>>>> 1181 struct bio *bio)
> >>>>> 1182 {
> >>>>> 1183 struct search *s;
> >>>>> 1184 struct bcache_device *d = bio->bi_disk->private_data;
> >>>>> 1185 struct cached_dev *dc = container_of(d, struct
> >>>>> cached_dev, disk);
> >>>>> 1186 int rw = bio_data_dir(bio);
> >>>>> 1187
> >>>>> 1188 if (unlikely((d->c && test_bit(CACHE_SET_IO_DISABLE,
> >>>>> &d->c->flags)) ||
> >>>>> 1189 dc->io_disable)) {
> >>>>> 1190 bio->bi_status = BLK_STS_IOERR;
> >>>>> 1191 bio_endio(bio);
> >>>>> 1192 return BLK_QC_T_NONE;
> >>>>> 1193 }
> >>>>>
> >>>>> 901 static inline void closure_bio_submit(struct cache_set *c,
> >>>>> 902 struct bio *bio,
> >>>>> 903 struct closure *cl)
> >>>>> 904 {
> >>>>> 905 closure_get(cl);
> >>>>> 906 if (unlikely(test_bit(CACHE_SET_IO_DISABLE, &c->flags))) {
> >>>>> 907 bio->bi_status = BLK_STS_IOERR;
> >>>>> 908 bio_endio(bio);
> >>>>> 909 return;
> >>>>> 910 }
> >>>>> 911 generic_make_request(bio);
> >>>>> 912 }
> >>>>>
> >>>>> Can the cache set detached and don't return error status to fs?
> >>>>
> >>>>
> >>>> Hi Zhang,
> >>>>
> >>>>
> >>>> What is your kernel version and where do you get the kernel?
> >>>> My kernel version is 4.18 of Centos.
> >>> The code of this part is same with upstream kernel.
> >>>> It seems like an as designed behavior, could you please describe
> >>>> more detail about the operation sequence?
> >>>>
> >>> Yes, i think so too.
> >>> The reproduce opreation as follows:
> >>> 1. mount a bcache disk with xfs
> >>>
> >>> /dev/bcache1 on /media/disk1 type xfs
> >>>
> >>> 2. run ls in background
> >>> #!/bin/bash
> >>>
> >>> while true
> >>> do
> >>> echo 2 > /proc/sys/vm/drop_caches
> >>> ls -R /media/disk1 > /dev/null
> >>> done
> >>>
> >>>
> >>> 3. remove cache disk sdc
> >>> echo 1 >/sys/block/sdc/device/delete
> >>>
> >>> 4. dmesg should get xfs error
> >>>
> >>> I write a patch to improve，please help to review it, thanks.
> >
> >>
> >> Hold on. Why do you think it should be fixed? As I said, it is
> >> as-designed behavior.
> >>
> > We use bcache in writearound mode, just cache read io.
> > Currently, bcache return io error during detach, randomly lead to
> > xfs force shutdown.
> >
> > After bcache auto detach finished, some dir read write normaly, but
> > the others can't read write because of xfs force shutdown.
> > This inconsistency confuses filesystem users.
>
>
> Hi Zhen and Nix,
>
> OK, I come to realize the motivation. Yes you are right, this is an
> awkward issue and good to be fixed.
>
Hi Coly,
So you will pick this patch into your tree ？
>
> Coly Li
>
>
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: bcache detach lead to xfs force shutdown
2022-03-07 7:56 ` zhangzhen.email
@ 2022-03-07 8:21 ` Coly Li
2022-03-07 9:06 ` zhangzhen.email
2022-03-07 9:16 ` [PATCH] Bcache: don't return BLK_STS_IOERR during cache detach Zhen Zhang
0 siblings, 2 replies; 13+ messages in thread
From: Coly Li @ 2022-03-07 8:21 UTC (permalink / raw)
To: zhangzhen.email; +Cc: Nix, linux-bcache, jianchao.wan9
On 3/7/22 3:56 PM, zhangzhen.email@gmail.com wrote:
>> >>
>> >> Hold on. Why do you think it should be fixed? As I said, it is >>
>> as-designed behavior.
>> >>
>> > We use bcache in writearound mode, just cache read io.
>> > Currently, bcache return io error during detach, randomly lead to
>> > xfs force shutdown.
>> >
>> > After bcache auto detach finished, some dir read write normaly, but
>> > the others can't read write because of xfs force shutdown.
>> > This inconsistency confuses filesystem users.
>>
>>
>> Hi Zhen and Nix,
>>
>> OK, I come to realize the motivation. Yes you are right, this is an
>> awkward issue and good to be fixed.
>>
> Hi Coly,
>
> So you will pick this patch into your tree ？
I need to look the patch firstly, could you please post a proposal patch
for review ?
Coly Li
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: bcache detach lead to xfs force shutdown
2022-03-07 8:21 ` Coly Li
@ 2022-03-07 9:06 ` zhangzhen.email
2022-03-07 9:16 ` [PATCH] Bcache: don't return BLK_STS_IOERR during cache detach Zhen Zhang
1 sibling, 0 replies; 13+ messages in thread
From: zhangzhen.email @ 2022-03-07 9:06 UTC (permalink / raw)
To: Coly Li, Nix, linux-bcache, jianchao.wan9
On 3/7/22 4:21 PM, Coly Li <colyli@suse.de> wrote:
> On 3/7/22 3:56 PM, zhangzhen.email@gmail.com wrote:
>
> >> >>
> >> >> Hold on. Why do you think it should be fixed? As I said, it is >>
> >> as-designed behavior.
> >> >>
> >> > We use bcache in writearound mode, just cache read io.
> >> > Currently, bcache return io error during detach, randomly lead to
> >> > xfs force shutdown.
> >> >
> >> > After bcache auto detach finished, some dir read write normaly, but
> >> > the others can't read write because of xfs force shutdown.
> >> > This inconsistency confuses filesystem users.
> >>
> >>
> >> Hi Zhen and Nix,
> >>
> >> OK, I come to realize the motivation. Yes you are right, this is an
> >> awkward issue and good to be fixed.
> >>
> > Hi Coly,
> >
> > So you will pick this patch into your tree ？
>
>
> I need to look the patch firstly, could you please post a proposal patch
> for review ?
Ok.
>
>
> Coly Li
>
>
^ permalink raw reply [flat|nested] 13+ messages in thread
* [PATCH] Bcache: don't return BLK_STS_IOERR during cache detach
2022-03-07 8:21 ` Coly Li
2022-03-07 9:06 ` zhangzhen.email
@ 2022-03-07 9:16 ` Zhen Zhang
1 sibling, 0 replies; 13+ messages in thread
From: Zhen Zhang @ 2022-03-07 9:16 UTC (permalink / raw)
To: linux-bcache
Before this patch, if cache device missing, cached_dev_submit_bio return io err
to fs during cache detach, randomly lead to xfs do force shutdown.
This patch delay the cache io submit in cached_dev_submit_bio
and wait for cache set detach finish.
So if the cache device become missing, bcache detach cache set automatically,
and the io will sumbit normally.
Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56: IO error on writing btree.
Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57: IO error on writing btree.
Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56: IO error on writing btree.
Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in "xfs_buf_iodone_callback_error" at daddr 0x80034658 len 32 error 12
Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() bcache: error on 004f8aa7-561a-4ba7-bf7b-292e461d3f18:
Feb 2 20:59:23 kernel: journal io error
Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() , disabling caching
Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
Feb 2 20:59:23 kernel: bcache: conditional_stop_bcache_device() stop_when_cache_set_failed of bcache43 is "auto" and cache is clean, keep it alive.
Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in "xlog_iodone" at daddr 0x400123e60 len 64 error 12
Feb 2 20:59:23 kernel: XFS (bcache43): xfs_do_force_shutdown(0x2) called from line 1298 of file fs/xfs/xfs_log.c. Return address = 00000000c1c8077f
Feb 2 20:59:23 kernel: XFS (bcache43): Log I/O Error Detected. Shutting down filesystem
Feb 2 20:59:23 kernel: XFS (bcache43): Please unmount the filesystem and rectify the problem(s)
Signed-off-by: Zhen Zhang <zhangzhen.email@gmail.com>
---
drivers/md/bcache/bcache.h | 5 -----
drivers/md/bcache/request.c | 8 ++++----
drivers/md/bcache/super.c | 3 ++-
3 files changed, 6 insertions(+), 10 deletions(-)
diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
index 9ed9c955add7..e5227dd08e3a 100644
--- a/drivers/md/bcache/bcache.h
+++ b/drivers/md/bcache/bcache.h
@@ -928,11 +928,6 @@ static inline void closure_bio_submit(struct cache_set *c,
struct closure *cl)
{
closure_get(cl);
- if (unlikely(test_bit(CACHE_SET_IO_DISABLE, &c->flags))) {
- bio->bi_status = BLK_STS_IOERR;
- bio_endio(bio);
- return;
- }
submit_bio_noacct(bio);
}
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index d15aae6c51c1..36f0ee95b51f 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -13,6 +13,7 @@
#include "request.h"
#include "writeback.h"
+#include <linux/delay.h>
#include <linux/module.h>
#include <linux/hash.h>
#include <linux/random.h>
@@ -1172,11 +1173,10 @@ void cached_dev_submit_bio(struct bio *bio)
unsigned long start_time;
int rw = bio_data_dir(bio);
- if (unlikely((d->c && test_bit(CACHE_SET_IO_DISABLE, &d->c->flags)) ||
+ while (unlikely((d->c && test_bit(CACHE_SET_IO_DISABLE, &d->c->flags)) ||
dc->io_disable)) {
- bio->bi_status = BLK_STS_IOERR;
- bio_endio(bio);
- return;
+ /* wait for detach finish and d->c == NULL. */
+ msleep(2);
}
if (likely(d->c)) {
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 140f35dc0c45..8d9a5e937bc8 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -661,7 +661,8 @@ int bch_prio_write(struct cache *ca, bool wait)
p->csum = bch_crc64(&p->magic, meta_bucket_bytes(&ca->sb) - 8);
bucket = bch_bucket_alloc(ca, RESERVE_PRIO, wait);
- BUG_ON(bucket == -1);
+ if (bucket == -1)
+ return -1;
mutex_unlock(&ca->set->bucket_lock);
prio_io(ca, bucket, REQ_OP_WRITE, 0);
--
2.25.1
^ permalink raw reply related [flat|nested] 13+ messages in thread
* Re: bcache detach lead to xfs force shutdown
2022-02-23 12:26 ` Zhang Zhen
2022-03-02 9:19 ` Coly Li
@ 2022-03-09 13:14 ` Coly Li
2022-03-10 2:01 ` Zhang Zhen
1 sibling, 1 reply; 13+ messages in thread
From: Coly Li @ 2022-03-09 13:14 UTC (permalink / raw)
To: Zhang Zhen; +Cc: linux-bcache, jianchao.wan9
On 2/23/22 8:26 PM, Zhang Zhen wrote:
>
> 在 2022/2/23 下午5:03, Coly Li 写道:
>> On 2/21/22 5:33 PM, Zhang Zhen wrote:
>>> Hi coly，
>>>
>>> We encounted a bcache detach problem, during the io process，the
>>> cache device become missing.
>>>
>>> The io error status returned to xfs， and in some case， the xfs do
>>> force shutdown.
>>>
>>> The dmesg as follows:
>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56:
>>> IO error on writing btree.
>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p44:
>>> IO error on writing btree.
>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p44:
>>> IO error on writing btree.
>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57:
>>> IO error on writing btree.
>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56:
>>> IO error on writing btree.
>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57:
>>> IO error on writing btree.
>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56:
>>> IO error on writing btree.
>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>> Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in
>>> "xfs_buf_iodone_callback_error" at daddr 0x80034658 len 32 error 12
>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>> Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() bcache: error
>>> on 004f8aa7-561a-4ba7-bf7b-292e461d3f18:
>>> Feb 2 20:59:23 kernel: journal io error
>>> Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() , disabling
>>> caching
>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>> Feb 2 20:59:23 kernel: bcache: conditional_stop_bcache_device()
>>> stop_when_cache_set_failed of bcache43 is "auto" and cache is clean,
>>> keep it alive.
>>> Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in
>>> "xlog_iodone" at daddr 0x400123e60 len 64 error 12
>>> Feb 2 20:59:23 kernel: XFS (bcache43): xfs_do_force_shutdown(0x2)
>>> called from line 1298 of file fs/xfs/xfs_log.c. Return address =
>>> 00000000c1c8077f
>>> Feb 2 20:59:23 kernel: XFS (bcache43): Log I/O Error Detected.
>>> Shutting down filesystem
>>> Feb 2 20:59:23 kernel: XFS (bcache43): Please unmount the
>>> filesystem and rectify the problem(s)
>>>
>>>
>>> We checked the code, the error status is returned in
>>> cached_dev_make_request and closure_bio_submit function.
>>>
>>> 1180 static blk_qc_t cached_dev_make_request(struct request_queue *q,
>>> 1181 struct bio *bio)
>>> 1182 {
>>> 1183 struct search *s;
>>> 1184 struct bcache_device *d = bio->bi_disk->private_data;
>>> 1185 struct cached_dev *dc = container_of(d, struct cached_dev,
>>> disk);
>>> 1186 int rw = bio_data_dir(bio);
>>> 1187
>>> 1188 if (unlikely((d->c && test_bit(CACHE_SET_IO_DISABLE,
>>> &d->c->flags)) ||
>>> 1189 dc->io_disable)) {
>>> 1190 bio->bi_status = BLK_STS_IOERR;
>>> 1191 bio_endio(bio);
>>> 1192 return BLK_QC_T_NONE;
>>> 1193 }
>>>
>>> 901 static inline void closure_bio_submit(struct cache_set *c,
>>> 902 struct bio *bio,
>>> 903 struct closure *cl)
>>> 904 {
>>> 905 closure_get(cl);
>>> 906 if (unlikely(test_bit(CACHE_SET_IO_DISABLE, &c->flags))) {
>>> 907 bio->bi_status = BLK_STS_IOERR;
>>> 908 bio_endio(bio);
>>> 909 return;
>>> 910 }
>>> 911 generic_make_request(bio);
>>> 912 }
>>>
>>> Can the cache set detached and don't return error status to fs?
>>
>>
>> Hi Zhang,
>>
>>
>> What is your kernel version and where do you get the kernel?
>> My kernel version is 4.18 of Centos.
> The code of this part is same with upstream kernel.
>> It seems like an as designed behavior, could you please describe more
>> detail about the operation sequence?
>>
> Yes, i think so too.
> The reproduce opreation as follows:
> 1. mount a bcache disk with xfs
>
> /dev/bcache1 on /media/disk1 type xfs
>
> 2. run ls in background
> #!/bin/bash
>
> while true
> do
> echo 2 > /proc/sys/vm/drop_caches
> ls -R /media/disk1 > /dev/null
> done
>
>
> 3. remove cache disk sdc
> echo 1 >/sys/block/sdc/device/delete
>
> 4. dmesg should get xfs error
>
> I write a patch to improve，please help to review it, thanks.
Could you please post the patch in email body? Otherwise I am not able
to reply you in line. I read your patch, it is unacceptable in general,
but I'd like to provide my point for your reference.
Coly Li
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: bcache detach lead to xfs force shutdown
2022-03-09 13:14 ` bcache detach lead to xfs force shutdown Coly Li
@ 2022-03-10 2:01 ` Zhang Zhen
0 siblings, 0 replies; 13+ messages in thread
From: Zhang Zhen @ 2022-03-10 2:01 UTC (permalink / raw)
To: Coly Li; +Cc: linux-bcache, jianchao.wan9
On 3/9/22 9:14 PM, Coly Li wrote:
> On 2/23/22 8:26 PM, Zhang Zhen wrote:
>>
>> 在 2022/2/23 下午5:03, Coly Li 写道:
>>> On 2/21/22 5:33 PM, Zhang Zhen wrote:
>>>> Hi coly，
>>>>
>>>> We encounted a bcache detach problem, during the io process，the
>>>> cache device become missing.
>>>>
>>>> The io error status returned to xfs， and in some case， the xfs do
>>>> force shutdown.
>>>>
>>>> The dmesg as follows:
>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56:
>>>> IO error on writing btree.
>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p44:
>>>> IO error on writing btree.
>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p44:
>>>> IO error on writing btree.
>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57:
>>>> IO error on writing btree.
>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56:
>>>> IO error on writing btree.
>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p57:
>>>> IO error on writing btree.
>>>> Feb 2 20:59:23 kernel: bcache: bch_count_io_errors() nvme0n1p56:
>>>> IO error on writing btree.
>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>>> Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in
>>>> "xfs_buf_iodone_callback_error" at daddr 0x80034658 len 32 error 12
>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>>> Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() bcache: error
>>>> on 004f8aa7-561a-4ba7-bf7b-292e461d3f18:
>>>> Feb 2 20:59:23 kernel: journal io error
>>>> Feb 2 20:59:23 kernel: bcache: bch_cache_set_error() , disabling
>>>> caching
>>>> Feb 2 20:59:23 kernel: bcache: bch_btree_insert() error -5
>>>> Feb 2 20:59:23 kernel: bcache: conditional_stop_bcache_device()
>>>> stop_when_cache_set_failed of bcache43 is "auto" and cache is clean,
>>>> keep it alive.
>>>> Feb 2 20:59:23 kernel: XFS (bcache43): metadata I/O error in
>>>> "xlog_iodone" at daddr 0x400123e60 len 64 error 12
>>>> Feb 2 20:59:23 kernel: XFS (bcache43): xfs_do_force_shutdown(0x2)
>>>> called from line 1298 of file fs/xfs/xfs_log.c. Return address =
>>>> 00000000c1c8077f
>>>> Feb 2 20:59:23 kernel: XFS (bcache43): Log I/O Error Detected.
>>>> Shutting down filesystem
>>>> Feb 2 20:59:23 kernel: XFS (bcache43): Please unmount the
>>>> filesystem and rectify the problem(s)
>>>>
>>>>
>>>> We checked the code, the error status is returned in
>>>> cached_dev_make_request and closure_bio_submit function.
>>>>
>>>> 1180 static blk_qc_t cached_dev_make_request(struct request_queue *q,
>>>> 1181 struct bio *bio)
>>>> 1182 {
>>>> 1183 struct search *s;
>>>> 1184 struct bcache_device *d = bio->bi_disk->private_data;
>>>> 1185 struct cached_dev *dc = container_of(d, struct cached_dev,
>>>> disk);
>>>> 1186 int rw = bio_data_dir(bio);
>>>> 1187
>>>> 1188 if (unlikely((d->c && test_bit(CACHE_SET_IO_DISABLE,
>>>> &d->c->flags)) ||
>>>> 1189 dc->io_disable)) {
>>>> 1190 bio->bi_status = BLK_STS_IOERR;
>>>> 1191 bio_endio(bio);
>>>> 1192 return BLK_QC_T_NONE;
>>>> 1193 }
>>>>
>>>> 901 static inline void closure_bio_submit(struct cache_set *c,
>>>> 902 struct bio *bio,
>>>> 903 struct closure *cl)
>>>> 904 {
>>>> 905 closure_get(cl);
>>>> 906 if (unlikely(test_bit(CACHE_SET_IO_DISABLE, &c->flags))) {
>>>> 907 bio->bi_status = BLK_STS_IOERR;
>>>> 908 bio_endio(bio);
>>>> 909 return;
>>>> 910 }
>>>> 911 generic_make_request(bio);
>>>> 912 }
>>>>
>>>> Can the cache set detached and don't return error status to fs?
>>>
>>>
>>> Hi Zhang,
>>>
>>>
>>> What is your kernel version and where do you get the kernel?
>>> My kernel version is 4.18 of Centos.
>> The code of this part is same with upstream kernel.
>>> It seems like an as designed behavior, could you please describe more
>>> detail about the operation sequence?
>>>
>> Yes, i think so too.
>> The reproduce opreation as follows:
>> 1. mount a bcache disk with xfs
>>
>> /dev/bcache1 on /media/disk1 type xfs
>>
>> 2. run ls in background
>> #!/bin/bash
>>
>> while true
>> do
>> echo 2 > /proc/sys/vm/drop_caches
>> ls -R /media/disk1 > /dev/null
>> done
>>
>>
>> 3. remove cache disk sdc
>> echo 1 >/sys/block/sdc/device/delete
>>
>> 4. dmesg should get xfs error
>>
>> I write a patch to improve，please help to review it, thanks.
>
>
> Could you please post the patch in email body? Otherwise I am not able
> to reply you in line. I read your patch, it is unacceptable in general,
> but I'd like to provide my point for your reference.
>
Ok，i will send the patch in another email.
Thanks.
>
> Coly Li
>
>
>
>
^ permalink raw reply [flat|nested] 13+ messages in thread
end of thread, other threads:[~2022-03-10 2:01 UTC | newest]
Thread overview: 13+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-02-21 9:33 bcache detach lead to xfs force shutdown Zhang Zhen
2022-02-23 9:03 ` Coly Li
2022-02-23 12:26 ` Zhang Zhen
2022-03-02 9:19 ` Coly Li
2022-03-03 17:42 ` Nix
2022-03-04 8:22 ` Zhang Zhen
2022-03-04 8:42 ` Coly Li
2022-03-07 7:56 ` zhangzhen.email
2022-03-07 8:21 ` Coly Li
2022-03-07 9:06 ` zhangzhen.email
2022-03-07 9:16 ` [PATCH] Bcache: don't return BLK_STS_IOERR during cache detach Zhen Zhang
2022-03-09 13:14 ` bcache detach lead to xfs force shutdown Coly Li
2022-03-10 2:01 ` Zhang Zhen
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.