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[PATCH] sysctl: add a parent entry to ctl_table and set the parent entry

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Add a parent entry into the ctl_table so you can walk the list of parents and
find the entire path to a ctl_table entry.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric W. Biederman 2007-02-14 00:34:13 -08:00 committed by Linus Torvalds
parent 77b14db502
commit d912b0cc1a
2 changed files with 19 additions and 0 deletions
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1
include/linux/sysctl.h
View file

@ -1022,6 +1022,7 @@ struct ctl_table
int maxlen;
mode_t mode;
ctl_table *child;
ctl_table *parent; /* Automatically set */
proc_handler *proc_handler; /* Callback for text formatting */
ctl_handler *strategy; /* Callback function for all r/w */
struct proc_dir_entry *de; /* /proc control block */

18
kernel/sysctl.c
View file

@ -1240,6 +1240,23 @@ int do_sysctl_strategy (ctl_table *table,
}
#endif /* CONFIG_SYSCTL_SYSCALL */
static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
{
for (; table->ctl_name || table->procname; table++) {
table->parent = parent;
if (table->child)
sysctl_set_parent(table, table->child);
}
}
static __init int sysctl_init(void)
{
sysctl_set_parent(NULL, root_table);
return 0;
}
core_initcall(sysctl_init);
/**
* register_sysctl_table - register a sysctl hierarchy
* @table: the top-level table structure
@ -1318,6 +1335,7 @@ struct ctl_table_header *register_sysctl_table(ctl_table * table)
INIT_LIST_HEAD(&tmp->ctl_entry);
tmp->used = 0;
tmp->unregistering = NULL;
sysctl_set_parent(NULL, table);
spin_lock(&sysctl_lock);
list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
spin_unlock(&sysctl_lock);