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gfs2: limit quota log messages 

This patch makes the quota subsystem only report once that a
particular user/group has exceeded their allotted quota.

Previously, it was possible for a program to continuously try
exceeding quota (despite receiving EDQUOT) and in turn trigger
gfs2 to issue a kernel log message about quota exceed. In theory,
this could get out of hand and flood the log and the filesystem
hosting the log files.

Signed-off-by: Abhi Das <adas@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Abhi Das 2015-06-02 11:03:04 -05:00 committed by Bob Peterson
parent 39a725803b
commit 9cde2898d0
2 changed files with 12 additions and 4 deletions
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1
fs/gfs2/incore.h
View File

@ -432,6 +432,7 @@ enum {
QDF_CHANGE = 1,
QDF_LOCKED = 2,
QDF_REFRESH = 3,
QDF_QMSG_QUIET = 4,
};
struct gfs2_quota_data {

15
fs/gfs2/quota.c
View File

@ -649,6 +649,8 @@ static void do_qc(struct gfs2_quota_data *qd, s64 change)
slot_hold(qd);
}
if (change < 0) /* Reset quiet flag if we freed some blocks */
clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
mutex_unlock(&sdp->sd_quota_mutex);
}
@ -1187,10 +1189,13 @@ int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
/* If no min_target specified or we don't meet
* min_target, return -EDQUOT */
if (!ap->min_target || ap->min_target > ap->allowed) {
print_message(qd, "exceeded");
quota_send_warning(qd->qd_id,
sdp->sd_vfs->s_dev,
QUOTA_NL_BHARDWARN);
if (!test_and_set_bit(QDF_QMSG_QUIET,
&qd->qd_flags)) {
print_message(qd, "exceeded");
quota_send_warning(qd->qd_id,
sdp->sd_vfs->s_dev,
QUOTA_NL_BHARDWARN);
}
error = -EDQUOT;
break;
}
@ -1685,6 +1690,8 @@ static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
/* Apply changes */
error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
if (!error)
clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
gfs2_trans_end(sdp);
out_release: