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Subject[PATCH 1/9] sysctl: add ctl_header_cookie
Date
Signed-off-by: Lucian Adrian Grijincu <lucian.grijincu@gmail.com>
---
include/linux/sysctl.h | 5 ++++-
kernel/sysctl.c | 12 ++++++++----
net/sysctl_net.c | 6 +++---
3 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 7bb5cb6..43fed29 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -1048,6 +1048,9 @@ struct ctl_table_header
struct ctl_table *attached_by;
struct ctl_table *attached_to;
struct ctl_table_header *parent;
+ /* Pointer to data that outlives this ctl_table_header.
+ * Caller responsible to free the cookie. */
+ void *ctl_header_cookie;
};

/* struct ctl_path describes where in the hierarchy a table is added */
@@ -1058,7 +1061,7 @@ struct ctl_path {
void register_sysctl_root(struct ctl_table_root *root);
struct ctl_table_header *__register_sysctl_paths(
struct ctl_table_root *root, struct nsproxy *namespaces,
- const struct ctl_path *path, struct ctl_table *table);
+ const struct ctl_path *path, struct ctl_table *table, void *cookie);
struct ctl_table_header *register_sysctl_table(struct ctl_table * table);
struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
struct ctl_table *table);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 0f1bd83..31fd587 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -199,6 +199,7 @@ static struct ctl_table_header root_table_header = {
.ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
.root = &sysctl_table_root,
.set = &sysctl_table_root.default_set,
+ .ctl_header_cookie = NULL,
};
static struct ctl_table_root sysctl_table_root = {
.root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
@@ -1774,6 +1775,9 @@ static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
* @namespaces: Data to compute which lists of sysctl entries are visible
* @path: The path to the directory the sysctl table is in.
* @table: the top-level table structure
+ * @cookie: Pointer to user provided data that must be accessible
+ * until unregister_sysctl_table. This cookie will be passed to the
+ * proc_handler.
*
* Register a sysctl table hierarchy. @table should be a filled in ctl_table
* array. A completely 0 filled entry terminates the table.
@@ -1822,9 +1826,8 @@ static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
* to the table header on success.
*/
struct ctl_table_header *__register_sysctl_paths(
- struct ctl_table_root *root,
- struct nsproxy *namespaces,
- const struct ctl_path *path, struct ctl_table *table)
+ struct ctl_table_root *root, struct nsproxy *namespaces,
+ const struct ctl_path *path, struct ctl_table *table, void *cookie)
{
struct ctl_table_header *header;
struct ctl_table *new, **prevp;
@@ -1871,6 +1874,7 @@ struct ctl_table_header *__register_sysctl_paths(
header->root = root;
sysctl_set_parent(NULL, header->ctl_table);
header->count = 1;
+ header->ctl_header_cookie = cookie;
#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
if (sysctl_check_table(namespaces, header->ctl_table)) {
kfree(header);
@@ -1911,7 +1915,7 @@ struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
struct ctl_table *table)
{
return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
- path, table);
+ path, table, NULL);
}

/**
diff --git a/net/sysctl_net.c b/net/sysctl_net.c
index ca84212..9dadd17 100644
--- a/net/sysctl_net.c
+++ b/net/sysctl_net.c
@@ -109,8 +109,8 @@ struct ctl_table_header *register_net_sysctl_table(struct net *net,
struct nsproxy namespaces;
namespaces = *current->nsproxy;
namespaces.net_ns = net;
- return __register_sysctl_paths(&net_sysctl_root,
- &namespaces, path, table);
+ return __register_sysctl_paths(&net_sysctl_root, &namespaces, path,
+ table, NULL);
}
EXPORT_SYMBOL_GPL(register_net_sysctl_table);

@@ -118,7 +118,7 @@ struct ctl_table_header *register_net_sysctl_rotable(const
struct ctl_path *path, struct ctl_table *table)
{
return __register_sysctl_paths(&net_sysctl_ro_root,
- &init_nsproxy, path, table);
+ &init_nsproxy, path, table, NULL);
}
EXPORT_SYMBOL_GPL(register_net_sysctl_rotable);

--
1.7.4.rc1.7.g2cf08.dirty


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