Add a helper function nr_extradata_entries() to count the number of used extradata entries in a netconsole target. This refactors the duplicate code for counting entries into a single function, which will be reused by upcoming CPU sysdata changes.
The helper uses list_count_nodes() to count the number of children in the userdata group configfs hierarchy.
Signed-off-by: Breno Leitao leitao@debian.org Reviewed-by: Simon Horman horms@kernel.org --- drivers/net/netconsole.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c index 15867bb481e226cbb4164642e470baecca730a40..bfcc3809f4b5fa351c8e7e6340a54e93d525aa2e 100644 --- a/drivers/net/netconsole.c +++ b/drivers/net/netconsole.c @@ -662,6 +662,16 @@ static ssize_t remote_ip_store(struct config_item *item, const char *buf, return ret; }
+/* Count number of entries we have in extradata. + * This is important because the extradata_complete only supports + * MAX_EXTRADATA_ITEMS entries. Before enabling any new {user,sys}data + * feature, number of entries needs to checked for available space. + */ +static size_t count_extradata_entries(struct netconsole_target *nt) +{ + return list_count_nodes(&nt->userdata_group.cg_children); +} + static ssize_t remote_mac_store(struct config_item *item, const char *buf, size_t count) { @@ -811,15 +821,13 @@ static struct config_item *userdatum_make_item(struct config_group *group, struct netconsole_target *nt; struct userdatum *udm; struct userdata *ud; - size_t child_count;
if (strlen(name) > MAX_EXTRADATA_NAME_LEN) return ERR_PTR(-ENAMETOOLONG);
ud = to_userdata(&group->cg_item); nt = userdata_to_target(ud); - child_count = list_count_nodes(&nt->userdata_group.cg_children); - if (child_count >= MAX_EXTRADATA_ITEMS) + if (count_extradata_entries(nt) >= MAX_EXTRADATA_ITEMS) return ERR_PTR(-ENOSPC);
udm = kzalloc(sizeof(*udm), GFP_KERNEL);