quota: Allow each filesystem to specify which quota types it supports
Currently all filesystems supporting VFS quota support user and group
quotas. With introduction of project quotas this is going to change so
make sure filesystem isn't called for quota type it doesn't support by
introduction of a bitmask determining which quota types each filesystem
supports.
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/quota/quota.c b/fs/quota/quota.c
index 7562164..2aa4151 100644
--- a/fs/quota/quota.c
+++ b/fs/quota/quota.c
@@ -47,8 +47,11 @@
static void quota_sync_one(struct super_block *sb, void *arg)
{
- if (sb->s_qcop && sb->s_qcop->quota_sync)
- sb->s_qcop->quota_sync(sb, *(int *)arg);
+ int type = *(int *)arg;
+
+ if (sb->s_qcop && sb->s_qcop->quota_sync &&
+ (sb->s_quota_types & (1 << type)))
+ sb->s_qcop->quota_sync(sb, type);
}
static int quota_sync_all(int type)
@@ -297,8 +300,14 @@
if (type >= (XQM_COMMAND(cmd) ? XQM_MAXQUOTAS : MAXQUOTAS))
return -EINVAL;
+ /*
+ * Quota not supported on this fs? Check this before s_quota_types
+ * since they needn't be set if quota is not supported at all.
+ */
if (!sb->s_qcop)
return -ENOSYS;
+ if (!(sb->s_quota_types & (1 << type)))
+ return -EINVAL;
ret = check_quotactl_permission(sb, type, cmd, id);
if (ret < 0)