From db49d2df489f727096438706a5428115e84a3f0d Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Wed, 1 Oct 2008 18:21:39 +0200 Subject: quota: Allow negative usage of space and inodes For clustered filesystems, it can happen that space / inode usage goes negative temporarily (because some node is allocating another node is freeing and they are not completely in sync). So let quota code allow this and change qsize_t so a signed type so that we don't underflow the variables. Signed-off-by: Jan Kara Signed-off-by: Mark Fasheh --- fs/dquot.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'fs/dquot.c') diff --git a/fs/dquot.c b/fs/dquot.c index 74185c34a4f0..9c78ffe1aad2 100644 --- a/fs/dquot.c +++ b/fs/dquot.c @@ -847,7 +847,8 @@ static inline void dquot_incr_space(struct dquot *dquot, qsize_t number) static inline void dquot_decr_inodes(struct dquot *dquot, qsize_t number) { - if (dquot->dq_dqb.dqb_curinodes > number) + if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || + dquot->dq_dqb.dqb_curinodes >= number) dquot->dq_dqb.dqb_curinodes -= number; else dquot->dq_dqb.dqb_curinodes = 0; @@ -858,7 +859,8 @@ static inline void dquot_decr_inodes(struct dquot *dquot, qsize_t number) static inline void dquot_decr_space(struct dquot *dquot, qsize_t number) { - if (dquot->dq_dqb.dqb_curspace > number) + if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE || + dquot->dq_dqb.dqb_curspace >= number) dquot->dq_dqb.dqb_curspace -= number; else dquot->dq_dqb.dqb_curspace = 0; -- cgit v1.2.3