From 08261673cb6dc638c39f44d69b76fffb57b92a8b Mon Sep 17 00:00:00 2001 From: Andrew Perepechko Date: Mon, 12 Apr 2010 22:16:50 +0400 Subject: quota: Fix possible dq_flags corruption dq_flags are modified non-atomically in do_set_dqblk via __set_bit calls and atomically for example in mark_dquot_dirty or clear_dquot_dirty. Hence a change done by an atomic operation can be overwritten by a change done by a non-atomic one. Fix the problem by using atomic bitops even in do_set_dqblk. Signed-off-by: Andrew Perepechko Signed-off-by: Jan Kara --- fs/quota/dquot.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) (limited to 'fs') diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c index f9a37513f24c..a0a9405b202a 100644 --- a/fs/quota/dquot.c +++ b/fs/quota/dquot.c @@ -2328,34 +2328,34 @@ static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di) if (di->dqb_valid & QIF_SPACE) { dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace; check_blim = 1; - __set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); + set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); } if (di->dqb_valid & QIF_BLIMITS) { dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit); dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit); check_blim = 1; - __set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); + set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); } if (di->dqb_valid & QIF_INODES) { dm->dqb_curinodes = di->dqb_curinodes; check_ilim = 1; - __set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); + set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); } if (di->dqb_valid & QIF_ILIMITS) { dm->dqb_isoftlimit = di->dqb_isoftlimit; dm->dqb_ihardlimit = di->dqb_ihardlimit; check_ilim = 1; - __set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); + set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); } if (di->dqb_valid & QIF_BTIME) { dm->dqb_btime = di->dqb_btime; check_blim = 1; - __set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); + set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); } if (di->dqb_valid & QIF_ITIME) { dm->dqb_itime = di->dqb_itime; check_ilim = 1; - __set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); + set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); } if (check_blim) { -- cgit v1.2.1