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| author | Andrew Perepechko <andrew.perepechko@sun.com> | 2010-04-12 22:16:50 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-04-26 07:47:58 -0700 |
| commit | 527230ce812fb139ec4047c06acd4db63a15ff3e (patch) | |
| tree | 50047fbe70cb102229b933922a0462cb91e138a3 /fs/quota/dquot.c | |
| parent | 5e462ec4eb77a087383a384d2067d04e0b6d0621 (diff) | |
| download | kernel-crypto-527230ce812fb139ec4047c06acd4db63a15ff3e.tar.gz kernel-crypto-527230ce812fb139ec4047c06acd4db63a15ff3e.tar.xz kernel-crypto-527230ce812fb139ec4047c06acd4db63a15ff3e.zip | |
quota: Fix possible dq_flags corruption
commit 08261673cb6dc638c39f44d69b76fffb57b92a8b upstream.
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 <andrew.perepechko@sun.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/quota/dquot.c')
| -rw-r--r-- | fs/quota/dquot.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c index 6e722c11ce1..6c9da00ddda 100644 --- a/fs/quota/dquot.c +++ b/fs/quota/dquot.c @@ -2321,34 +2321,34 @@ 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) { |