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| author | zhangyi (F) <yi.zhang@huawei.com> | 2017-11-01 18:40:45 +0800 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2017-11-01 14:42:57 +0100 |
| commit | dd5f6279732e8885061d7455b9d86fdcfdf7f183 (patch) | |
| tree | 9e99d6577faa32f58a3b29178dc837320c9d0890 | |
| parent | cb91775711b2f3f7adea8d33aa83104baf75ee07 (diff) | |
| download | linux-dd5f6279732e8885061d7455b9d86fdcfdf7f183.tar.bz2 | |
quota: fix potential infinite loop
In dquot_writeback_dquots(), we write back dquot from dirty dquots
list. There is a potential infinite loop if ->write_dquot() failure
and forget remove dquot from the list. This patch clear dirty bit
anyway to avoid it.
Signed-off-by: zhangyi (F) <yi.zhang@huawei.com>
Signed-off-by: Jan Kara <jack@suse.cz>
| -rw-r--r-- | fs/quota/dquot.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c index 50b0556a124f..f68397923ebb 100644 --- a/fs/quota/dquot.c +++ b/fs/quota/dquot.c @@ -644,8 +644,15 @@ int dquot_writeback_dquots(struct super_block *sb, int type) spin_unlock(&dq_list_lock); dqstats_inc(DQST_LOOKUPS); err = sb->dq_op->write_dquot(dquot); - if (!ret && err) - ret = err; + if (err) { + /* + * Clear dirty bit anyway to avoid infinite + * loop here. + */ + clear_dquot_dirty(dquot); + if (!ret) + ret = err; + } dqput(dquot); spin_lock(&dq_list_lock); } |