[PATCH v2 04/14] sysctl: Add size argument to init_header

Joel Granados
2023-07-31T07:21:04Z

In this commit, we add a table_size argument to the init_header function
in order to initialize the ctl_table_size variable in ctl_table_header.
Even though the size is not yet used, it is now initialized within the
sysctl subsys. We need this commit for when we start adding the
table_size arguments to the sysctl functions (e.g. register_sysctl,
__register_sysctl_table and __register_sysctl_init).

Note that in __register_sysctl_table we temporarily use a calculated
size until we add the size argument to that function in subsequent
commits.

Signed-off-by: Joel Granados <j.granados@samsung.com>
---
fs/proc/proc_sysctl.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 884460b0385b..fa1438f1a355 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -188,9 +188,10 @@ static void erase_entry(struct ctl_table_header *head, struct ctl_table *entry)

static void init_header(struct ctl_table_header *head,
struct ctl_table_root *root, struct ctl_table_set *set,
- struct ctl_node *node, struct ctl_table *table)
+ struct ctl_node *node, struct ctl_table *table, size_t table_size)
{
head->ctl_table = table;
+ head->ctl_table_size = table_size;
head->ctl_table_arg = table;
head->used = 0;
head->count = 1;
@@ -973,7 +974,7 @@ static struct ctl_dir *new_dir(struct ctl_table_set *set,
memcpy(new_name, name, namelen);
table[0].procname = new_name;
table[0].mode = S_IFDIR|S_IRUGO|S_IXUGO;
- init_header(&new->header, set->dir.header.root, set, node, table);
+ init_header(&new->header, set->dir.header.root, set, node, table, 1);

return new;
}
@@ -1197,7 +1198,8 @@ static struct ctl_table_header *new_links(struct ctl_dir *dir, struct ctl_table_
link_name += len;
link++;
}
- init_header(links, dir->header.root, dir->header.set, node, link_table);
+ init_header(links, dir->header.root, dir->header.set, node, link_table,
+ head->ctl_table_size);
links->nreg = nr_entries;

return links;
@@ -1372,7 +1374,7 @@ struct ctl_table_header *__register_sysctl_table(
return NULL;

node = (struct ctl_node *)(header + 1);
- init_header(header, root, set, node, table);
+ init_header(header, root, set, node, table, nr_entries);
if (sysctl_check_table(path, header))
goto fail;

@@ -1537,7 +1539,7 @@ void setup_sysctl_set(struct ctl_table_set *set,
{
memset(set, 0, sizeof(*set));
set->is_seen = is_seen;
- init_header(&set->dir.header, root, set, NULL, root_table);
+ init_header(&set->dir.header, root, set, NULL, root_table, 1);
}

void retire_sysctl_set(struct ctl_table_set *set)
--
2.30.2