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quota: add missing lock into __dquot_transfer()

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Lock dq_dqb_lock around dquot_decr_inodes()

Signed-off-by: Konstantin Khlebnikov <[email protected]>
Fixes: 7b9ca4c61b ("quota: Reduce contention on dq_data_lock")
Signed-off-by: Jan Kara <[email protected]>
This commit is contained in:
Konstantin Khlebnikov 2017-09-09 12:19:22 +03:00 • committed by Jan Kara
commit 0a51fb7174
1 changed files with 2 additions and 0 deletions
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2
fs/quota/dquot.c
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@ -1980,7 +1980,9 @@ int __dquot_transfer(struct inode *inode, struct dquot **transfer_to)
ret = dquot_add_space(transfer_to[cnt], cur_space, rsv_space, 0,
&warn_to[cnt]);
if (ret) {
spin_lock(&transfer_to[cnt]->dq_dqb_lock);
dquot_decr_inodes(transfer_to[cnt], inode_usage);
spin_unlock(&transfer_to[cnt]->dq_dqb_lock);
goto over_quota;
}
}