GFS2: Protect quota sync generation
Now that gfs2_quota_sync can be potentially called from multiple
threads, we should protect this bit of code, and the sync generation
number in particular in order to ensure that there are no races
when syncing quotas.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Cc: Abhijith Das <adas@redhat.com>
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 37b3cd7..2ab4f8d 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -714,6 +714,7 @@
struct list_head sd_quota_list;
atomic_t sd_quota_count;
struct mutex sd_quota_mutex;
+ struct mutex sd_quota_sync_mutex;
wait_queue_head_t sd_quota_wait;
struct list_head sd_trunc_list;
spinlock_t sd_trunc_lock;
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 8e40fda..82303b4 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -93,6 +93,7 @@
INIT_LIST_HEAD(&sdp->sd_quota_list);
mutex_init(&sdp->sd_quota_mutex);
+ mutex_init(&sdp->sd_quota_sync_mutex);
init_waitqueue_head(&sdp->sd_quota_wait);
INIT_LIST_HEAD(&sdp->sd_trunc_list);
spin_lock_init(&sdp->sd_trunc_lock);
diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index cfb4cde..4a9726a 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -1132,12 +1132,13 @@
unsigned int x;
int error = 0;
- sdp->sd_quota_sync_gen++;
-
qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
if (!qda)
return -ENOMEM;
+ mutex_lock(&sdp->sd_quota_sync_mutex);
+ sdp->sd_quota_sync_gen++;
+
do {
num_qd = 0;
@@ -1162,6 +1163,7 @@
}
} while (!error && num_qd == max_qd);
+ mutex_unlock(&sdp->sd_quota_sync_mutex);
kfree(qda);
return error;