From: Jan Kara <jack@suse.cz>

We should send quota message to netlink only once when hardlimit is
reached.  Otherwise user could easily make the system busy by trying to
exceed the hardlimit (and also the messages could be anoying if you cannot
stop writing just now).

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/dquot.c |   23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff -puN fs/dquot.c~dont-send-quota-messages-repeatedly-when-hardlimit-reached fs/dquot.c
--- a/fs/dquot.c~dont-send-quota-messages-repeatedly-when-hardlimit-reached
+++ a/fs/dquot.c
@@ -827,6 +827,18 @@ static inline void dquot_decr_space(stru
 	clear_bit(DQ_BLKS_B, &dquot->dq_flags);
 }
 
+static int warning_issued(struct dquot *dquot, const int warntype)
+{
+	int flag = (warntype == QUOTA_NL_BHARDWARN ||
+		warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
+		((warntype == QUOTA_NL_IHARDWARN ||
+		warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
+
+	if (!flag)
+		return 0;
+	return test_and_set_bit(flag, &dquot->dq_flags);
+}
+
 #ifdef CONFIG_PRINT_QUOTA_WARNING
 static int flag_print_warnings = 1;
 
@@ -845,16 +857,12 @@ static inline int need_print_warning(str
 }
 
 /* Print warning to user which exceeded quota */
-static void print_warning(struct dquot *dquot, const char warntype)
+static void print_warning(struct dquot *dquot, const int warntype)
 {
 	char *msg = NULL;
 	struct tty_struct *tty;
-	int flag = (warntype == QUOTA_NL_BHARDWARN ||
-		warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
-		((warntype == QUOTA_NL_IHARDWARN ||
-		warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
 
-	if (!need_print_warning(dquot) || (flag && test_and_set_bit(flag, &dquot->dq_flags)))
+	if (!need_print_warning(dquot))
 		return;
 
 	mutex_lock(&tty_mutex);
@@ -969,7 +977,8 @@ static inline void flush_warnings(struct
 	int i;
 
 	for (i = 0; i < MAXQUOTAS; i++)
-		if (dquots[i] != NODQUOT && warntype[i] != QUOTA_NL_NOWARN) {
+		if (dquots[i] != NODQUOT && warntype[i] != QUOTA_NL_NOWARN &&
+		    !warning_issued(dquots[i], warntype[i])) {
 #ifdef CONFIG_PRINT_QUOTA_WARNING
 			print_warning(dquots[i], warntype[i]);
 #endif
_