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-rw-r--r--net/netlink/genetlink.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 353909d46dda..bee91a7527a5 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -69,8 +69,11 @@ static struct list_head family_ht[GENL_FAM_TAB_SIZE];
* abuses the API and thinks it can statically use group 1.
* That group will typically conflict with other groups that
* any proper users use.
+ * Bit 17 is marked as already used since the VFS quota code
+ * also abused this API and relied on family == group ID, we
+ * cater to that by giving it a static family and group ID.
*/
-static unsigned long mc_group_start = 0x3;
+static unsigned long mc_group_start = 0x3 | BIT(GENL_ID_VFS_DQUOT);
static unsigned long *mc_groups = &mc_group_start;
static unsigned long mc_groups_longs = 1;
@@ -130,7 +133,8 @@ static u16 genl_generate_id(void)
int i;
for (i = 0; i <= GENL_MAX_ID - GENL_MIN_ID; i++) {
- if (!genl_family_find_byid(id_gen_idx))
+ if (id_gen_idx != GENL_ID_VFS_DQUOT &&
+ !genl_family_find_byid(id_gen_idx))
return id_gen_idx;
if (++id_gen_idx > GENL_MAX_ID)
id_gen_idx = GENL_MIN_ID;
@@ -169,6 +173,8 @@ int genl_register_mc_group(struct genl_family *family,
id = GENL_ID_CTRL;
else if (strcmp(family->name, "NET_DM") == 0)
id = 1;
+ else if (strcmp(family->name, "VFS_DQUOT") == 0)
+ id = GENL_ID_VFS_DQUOT;
else
id = find_first_zero_bit(mc_groups,
mc_groups_longs * BITS_PER_LONG);