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authorEric W. Biederman <ebiederm@xmission.com>2007-11-30 23:54:00 +1100
committerDavid S. Miller <davem@davemloft.net>2008-01-28 14:55:17 -0800
commite51b6ba077791f2f8c876022b37419be7a2ceec3 (patch)
tree9d8ca18f3239eff84cad5b79b715c332970fa89d /include
parent23eb06de7d2d333a0f7ebba2da663e00c9c9483e (diff)
sysctl: Infrastructure for per namespace sysctls
This patch implements the basic infrastructure for per namespace sysctls. A list of lists of sysctl headers is added, allowing each namespace to have it's own list of sysctl headers. Each list of sysctl headers has a lookup function to find the first sysctl header in the list, allowing the lists to have a per namespace instance. register_sysct_root is added to tell sysctl.c about additional lists of sysctl_headers. As all of the users are expected to be in kernel no unregister function is provided. sysctl_head_next is updated to walk through the list of lists. __register_sysctl_paths is added to add a new sysctl table on a non-default sysctl list. The only intrusive part of this patch is propagating the information to decided which list of sysctls to use for sysctl_check_table. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Serge Hallyn <serue@us.ibm.com> Cc: Daniel Lezcano <dlezcano@fr.ibm.com> Cc: Cedric Le Goater <clg@fr.ibm.com> Cc: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/sysctl.h17
1 files changed, 16 insertions, 1 deletions
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 77de3bfd874..89faebfe48b 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -945,7 +945,10 @@ enum
/* For the /proc/sys support */
struct ctl_table;
+struct nsproxy;
extern struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev);
+extern struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
+ struct ctl_table_header *prev);
extern void sysctl_head_finish(struct ctl_table_header *prev);
extern int sysctl_perm(struct ctl_table *table, int op);
@@ -1049,6 +1052,13 @@ struct ctl_table
void *extra2;
};
+struct ctl_table_root {
+ struct list_head root_list;
+ struct list_head header_list;
+ struct list_head *(*lookup)(struct ctl_table_root *root,
+ struct nsproxy *namespaces);
+};
+
/* struct ctl_table_header is used to maintain dynamic lists of
struct ctl_table trees. */
struct ctl_table_header
@@ -1058,6 +1068,7 @@ struct ctl_table_header
int used;
struct completion *unregistering;
struct ctl_table *ctl_table_arg;
+ struct ctl_table_root *root;
};
/* struct ctl_path describes where in the hierarchy a table is added */
@@ -1066,12 +1077,16 @@ struct ctl_path {
int ctl_name;
};
+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);
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);
void unregister_sysctl_table(struct ctl_table_header * table);
-int sysctl_check_table(struct ctl_table *table);
+int sysctl_check_table(struct nsproxy *namespaces, struct ctl_table *table);
#else /* __KERNEL__ */