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SubjectRe: [PATCH] quota: fix to propagate error of mark_dquot_dirty() to caller
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On 2024/4/12 21:01, Jan Kara wrote:
> On Fri 12-04-24 14:15:17, Jan Kara wrote:
>> On Fri 12-04-24 17:49:42, Chao Yu wrote:
>>> in order to let caller be aware of failure of mark_dquot_dirty().
>>>
>>> Signed-off-by: Chao Yu <chao@kernel.org>
>>
>> Thanks. I've added the patch to my tree.
>
> So this patch was buggy because mark_all_dquots() dirty was returning 1 in
> case some dquot was indeed dirtied which resulted in e.g.
> dquot_alloc_inode() to return 1 and consequently __ext4_new_inode() to fail
This is what I try to say in my another f2fs patch, some callers use if
return value is zero not *less than zero* to check success or not.
Luckily, maybe f2fs doesn't use it this way.

> and eventually we've crashed in ext4_create(). I've fixed up the patch to
> make mark_all_dquots() return 0 or error.
>
> Honza
>
>>> ---
>>> fs/quota/dquot.c | 21 ++++++++++++++-------
>>> 1 file changed, 14 insertions(+), 7 deletions(-)
>>>
>>> diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
>>> index dacbee455c03..b2a109d8b198 100644
>>> --- a/fs/quota/dquot.c
>>> +++ b/fs/quota/dquot.c
>>> @@ -1737,7 +1737,7 @@ int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags)
>>>
>>> if (reserve)
>>> goto out_flush_warn;
>>> - mark_all_dquot_dirty(dquots);
>>> + ret = mark_all_dquot_dirty(dquots);
>>> out_flush_warn:
>>> srcu_read_unlock(&dquot_srcu, index);
>>> flush_warnings(warn);
>>> @@ -1786,7 +1786,7 @@ int dquot_alloc_inode(struct inode *inode)
>>> warn_put_all:
>>> spin_unlock(&inode->i_lock);
>>> if (ret == 0)
>>> - mark_all_dquot_dirty(dquots);
>>> + ret = mark_all_dquot_dirty(dquots);
>>> srcu_read_unlock(&dquot_srcu, index);
>>> flush_warnings(warn);
>>> return ret;
>>> @@ -1990,7 +1990,7 @@ int __dquot_transfer(struct inode *inode, struct dquot **transfer_to)
>>> qsize_t inode_usage = 1;
>>> struct dquot __rcu **dquots;
>>> struct dquot *transfer_from[MAXQUOTAS] = {};
>>> - int cnt, index, ret = 0;
>>> + int cnt, index, ret = 0, err;
>>> char is_valid[MAXQUOTAS] = {};
>>> struct dquot_warn warn_to[MAXQUOTAS];
>>> struct dquot_warn warn_from_inodes[MAXQUOTAS];
>>> @@ -2087,8 +2087,12 @@ int __dquot_transfer(struct inode *inode, struct dquot **transfer_to)
>>> * mark_all_dquot_dirty().
>>> */
>>> index = srcu_read_lock(&dquot_srcu);
>>> - mark_all_dquot_dirty((struct dquot __rcu **)transfer_from);
>>> - mark_all_dquot_dirty((struct dquot __rcu **)transfer_to);
>>> + err = mark_all_dquot_dirty((struct dquot __rcu **)transfer_from);
>>> + if (err < 0)
>>> + ret = err;
>>> + err = mark_all_dquot_dirty((struct dquot __rcu **)transfer_to);
>>> + if (err < 0)
>>> + ret = err;
>>> srcu_read_unlock(&dquot_srcu, index);
>>>
>>> flush_warnings(warn_to);
>>> @@ -2098,7 +2102,7 @@ int __dquot_transfer(struct inode *inode, struct dquot **transfer_to)
>>> for (cnt = 0; cnt < MAXQUOTAS; cnt++)
>>> if (is_valid[cnt])
>>> transfer_to[cnt] = transfer_from[cnt];
>>> - return 0;
>>> + return ret;
>>> over_quota:
>>> /* Back out changes we already did */
>>> for (cnt--; cnt >= 0; cnt--) {
>>> @@ -2726,6 +2730,7 @@ static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di)
>>> struct mem_dqblk *dm = &dquot->dq_dqb;
>>> int check_blim = 0, check_ilim = 0;
>>> struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type];
>>> + int ret;
>>>
>>> if (di->d_fieldmask & ~VFS_QC_MASK)
>>> return -EINVAL;
>>> @@ -2807,7 +2812,9 @@ static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di)
>>> else
>>> set_bit(DQ_FAKE_B, &dquot->dq_flags);
>>> spin_unlock(&dquot->dq_dqb_lock);
>>> - mark_dquot_dirty(dquot);
>>> + ret = mark_dquot_dirty(dquot);
>>> + if (ret < 0)
>>> + return ret;
>>>
>>> return 0;
>>> }
>>> --
>>> 2.40.1
>>>
>> --
>> Jan Kara <jack@suse.com>
>> SUSE Labs, CR
>>
--
Regards


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