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authorJan Kara <jack@suse.cz>2008-10-01 18:21:39 +0200
committerMark Fasheh <mfasheh@suse.com>2009-01-05 08:40:21 -0800
commitdb49d2df489f727096438706a5428115e84a3f0d (patch)
tree4ba9837a5371bb4a84dc27614eaeb4e4772e3eb8 /fs/dquot.c
parente3d4d56b9715e40ded2a84d0d4fa7f3b6c58983c (diff)
downloadlinux-db49d2df489f727096438706a5428115e84a3f0d.tar.bz2
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 <jack@suse.cz> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Diffstat (limited to 'fs/dquot.c')
-rw-r--r--fs/dquot.c6
1 files changed, 4 insertions, 2 deletions
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;