[PATCH v3 01/14] sysctl: Prefer ctl_table_header in proc_sysctl

[Joel Granados <joel.granados@xxxxxxxxx>]

This is a preparation commit that replaces ctl_table with
ctl_table_header as the pointer that is passed around in proc_sysctl.c.
This will become necessary in subsequent commits when the size of the
ctl_table array can no longer be calculated by searching for an empty
sentinel (last empty ctl_table element) but will be carried along inside
the ctl_table_header struct.

Signed-off-by: Joel Granados <j.granados@xxxxxxxxxxx>
---
 fs/proc/proc_sysctl.c | 36 ++++++++++++++++++------------------
 1 file changed, 18 insertions(+), 18 deletions(-)

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 5ea42653126e..94d71446da39 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -1125,11 +1125,11 @@ static int sysctl_check_table_array(const char *path, 
struct ctl_table *table)
        return err;
 }
 
-static int sysctl_check_table(const char *path, struct ctl_table *table)
+static int sysctl_check_table(const char *path, struct ctl_table_header 
*header)
 {
        struct ctl_table *entry;
        int err = 0;
-       list_for_each_table_entry(entry, table) {
+       list_for_each_table_entry(entry, header->ctl_table) {
                if ((entry->proc_handler == proc_dostring) ||
                    (entry->proc_handler == proc_dobool) ||
                    (entry->proc_handler == proc_dointvec) ||
@@ -1159,8 +1159,7 @@ static int sysctl_check_table(const char *path, struct 
ctl_table *table)
        return err;
 }
 
-static struct ctl_table_header *new_links(struct ctl_dir *dir, struct 
ctl_table *table,
-       struct ctl_table_root *link_root)
+static struct ctl_table_header *new_links(struct ctl_dir *dir, struct 
ctl_table_header *head)
 {
        struct ctl_table *link_table, *entry, *link;
        struct ctl_table_header *links;
@@ -1170,7 +1169,7 @@ static struct ctl_table_header *new_links(struct ctl_dir 
*dir, struct ctl_table
 
        name_bytes = 0;
        nr_entries = 0;
-       list_for_each_table_entry(entry, table) {
+       list_for_each_table_entry(entry, head->ctl_table) {
                nr_entries++;
                name_bytes += strlen(entry->procname) + 1;
        }
@@ -1189,12 +1188,12 @@ static struct ctl_table_header *new_links(struct 
ctl_dir *dir, struct ctl_table
        link_name = (char *)&link_table[nr_entries + 1];
        link = link_table;
 
-       list_for_each_table_entry(entry, table) {
+       list_for_each_table_entry(entry, head->ctl_table) {
                int len = strlen(entry->procname) + 1;
                memcpy(link_name, entry->procname, len);
                link->procname = link_name;
                link->mode = S_IFLNK|S_IRWXUGO;
-               link->data = link_root;
+               link->data = head->root;
                link_name += len;
                link++;
        }
@@ -1205,15 +1204,16 @@ static struct ctl_table_header *new_links(struct 
ctl_dir *dir, struct ctl_table
 }
 
 static bool get_links(struct ctl_dir *dir,
-       struct ctl_table *table, struct ctl_table_root *link_root)
+                     struct ctl_table_header *header,
+                     struct ctl_table_root *link_root)
 {
-       struct ctl_table_header *head;
+       struct ctl_table_header *tmp_head;
        struct ctl_table *entry, *link;
 
        /* Are there links available for every entry in table? */
-       list_for_each_table_entry(entry, table) {
+       list_for_each_table_entry(entry, header->ctl_table) {
                const char *procname = entry->procname;
-               link = find_entry(&head, dir, procname, strlen(procname));
+               link = find_entry(&tmp_head, dir, procname, strlen(procname));
                if (!link)
                        return false;
                if (S_ISDIR(link->mode) && S_ISDIR(entry->mode))
@@ -1224,10 +1224,10 @@ static bool get_links(struct ctl_dir *dir,
        }
 
        /* The checks passed.  Increase the registration count on the links */
-       list_for_each_table_entry(entry, table) {
+       list_for_each_table_entry(entry, header->ctl_table) {
                const char *procname = entry->procname;
-               link = find_entry(&head, dir, procname, strlen(procname));
-               head->nreg++;
+               link = find_entry(&tmp_head, dir, procname, strlen(procname));
+               tmp_head->nreg++;
        }
        return true;
 }
@@ -1246,13 +1246,13 @@ static int insert_links(struct ctl_table_header *head)
        if (IS_ERR(core_parent))
                return 0;
 
-       if (get_links(core_parent, head->ctl_table, head->root))
+       if (get_links(core_parent, head, head->root))
                return 0;
 
        core_parent->header.nreg++;
        spin_unlock(&sysctl_lock);
 
-       links = new_links(core_parent, head->ctl_table, head->root);
+       links = new_links(core_parent, head);
 
        spin_lock(&sysctl_lock);
        err = -ENOMEM;
@@ -1260,7 +1260,7 @@ static int insert_links(struct ctl_table_header *head)
                goto out;
 
        err = 0;
-       if (get_links(core_parent, head->ctl_table, head->root)) {
+       if (get_links(core_parent, head, head->root)) {
                kfree(links);
                goto out;
        }
@@ -1371,7 +1371,7 @@ struct ctl_table_header *__register_sysctl_table(
 
        node = (struct ctl_node *)(header + 1);
        init_header(header, root, set, node, table);
-       if (sysctl_check_table(path, table))
+       if (sysctl_check_table(path, header))
                goto fail;
 
        spin_lock(&sysctl_lock);
-- 
2.30.2