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Message-ID: <53854153.40601@gmail.com> Date: Wed, 28 May 2014 09:52:19 +0800 From: Niu Yawei <yawei.niu@...il.com> To: Christoph Hellwig <hch@...radead.org>, jack@...e.cz CC: linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org, yawei.niu@...el.com, andreas.dilger@...el.com, lai.siyao@...el.com Subject: [PATCH 1/3 v2] quota: protect Q_GETFMT by dqonoff_mutex Remove dqptr_sem to make quota code scalable: Protect the Q_GETFMT by dqonoff_mutex instead of dqptr_sem. Signed-off-by: Lai Siyao <lai.siyao@...el.com> Signed-off-by: Niu Yawei <yawei.niu@...el.com> --- fs/quota/quota.c | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-) diff --git a/fs/quota/quota.c b/fs/quota/quota.c index 2b363e2..e4851cb 100644 --- a/fs/quota/quota.c +++ b/fs/quota/quota.c @@ -79,13 +79,13 @@ static int quota_getfmt(struct super_block *sb, int type, void __user *addr) { __u32 fmt; - down_read(&sb_dqopt(sb)->dqptr_sem); + mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); if (!sb_has_quota_active(sb, type)) { - up_read(&sb_dqopt(sb)->dqptr_sem); + mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); return -ESRCH; } fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id; - up_read(&sb_dqopt(sb)->dqptr_sem); + mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); if (copy_to_user(addr, &fmt, sizeof(fmt))) return -EFAULT; return 0; -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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