Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=29e796fd4de54b8f5bc30d897611210ece4fd0f2
Commit: 29e796fd4de54b8f5bc30d897611210ece4fd0f2
Parent: be0ea7d5da3d99140bde7e5cea328eb111731700
Author: Eric W. Biederman <[EMAIL PROTECTED]>
AuthorDate: Fri Nov 30 23:50:18 2007 +1100
Committer: David S. Miller <[EMAIL PROTECTED]>
CommitDate: Mon Jan 28 14:55:16 2008 -0800
sysctl: Add register_sysctl_paths function
There are a number of modules that register a sysctl table
somewhere deeply nested in the sysctl hierarchy, such as
fs/nfs, fs/xfs, dev/cdrom, etc.
They all specify several dummy ctl_tables for the path name.
This patch implements register_sysctl_path that takes
an additional path name, and makes up dummy sysctl nodes
for each component.
This patch was originally written by Olaf Kirch and
brought to my attention and reworked some by Olaf Hering.
I have changed a few additional things so the bugs are mine.
After converting all of the easy callers Olaf Hering observed
allyesconfig ARCH=i386, the patch reduces the final binary size by 9369
bytes.
.text +897
.data -7008
text data bss dec hex filename
26959310 4045899 4718592 35723801 2211a19
../vmlinux-vanilla
26960207 4038891 4718592 35717690 221023a
../O-allyesconfig/vmlinux
So this change is both a space savings and a code simplification.
CC: Olaf Kirch <[EMAIL PROTECTED]>
CC: Olaf Hering <[EMAIL PROTECTED]>
Signed-off-by: Eric W. Biederman <[EMAIL PROTECTED]>
Cc: Serge Hallyn <[EMAIL PROTECTED]>
Cc: Daniel Lezcano <[EMAIL PROTECTED]>
Cc: Cedric Le Goater <[EMAIL PROTECTED]>
Cc: Pavel Emelyanov <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Herbert Xu <[EMAIL PROTECTED]>
Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
---
include/linux/sysctl.h | 8 ++++
kernel/sysctl.c | 89 +++++++++++++++++++++++++++++++++++++++--------
2 files changed, 82 insertions(+), 15 deletions(-)
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 4f5047d..3b6e2c9 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -1059,7 +1059,15 @@ struct ctl_table_header
struct completion *unregistering;
};
+/* struct ctl_path describes where in the hierarchy a table is added */
+struct ctl_path {
+ const char *procname;
+ int ctl_name;
+};
+
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);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 8e96558..f580542 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1561,11 +1561,12 @@ static __init int sysctl_init(void)
core_initcall(sysctl_init);
/**
- * register_sysctl_table - register a sysctl hierarchy
+ * register_sysctl_paths - register a sysctl hierarchy
+ * @path: The path to the directory the sysctl table is in.
* @table: the top-level table structure
*
* Register a sysctl table hierarchy. @table should be a filled in ctl_table
- * array. An entry with a ctl_name of 0 terminates the table.
+ * array. A completely 0 filled entry terminates the table.
*
* The members of the &struct ctl_table structure are used as follows:
*
@@ -1628,25 +1629,76 @@ core_initcall(sysctl_init);
* This routine returns %NULL on a failure to register, and a pointer
* to the table header on success.
*/
-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)
{
- struct ctl_table_header *tmp;
- tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
- if (!tmp)
+ struct ctl_table_header *header;
+ struct ctl_table *new, **prevp;
+ unsigned int n, npath;
+
+ /* Count the path components */
+ for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
+ ;
+
+ /*
+ * For each path component, allocate a 2-element ctl_table array.
+ * The first array element will be filled with the sysctl entry
+ * for this, the second will be the sentinel (ctl_name == 0).
+ *
+ * We allocate everything in one go so that we don't have to
+ * worry about freeing additional memory in unregister_sysctl_table.
+ */
+ header = kzalloc(sizeof(struct ctl_table_header) +
+ (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
+ if (!header)
return NULL;
- tmp->ctl_table = table;
- INIT_LIST_HEAD(&tmp->ctl_entry);
- tmp->used = 0;
- tmp->unregistering = NULL;
- sysctl_set_parent(NULL, table);
- if (sysctl_check_table(tmp->ctl_table)) {
- kfree(tmp);
+
+ new = (struct ctl_table *) (header + 1);
+
+ /* Now connect the dots */
+ prevp = &header->ctl_table;
+ for (n = 0; n < npath; ++n, ++path) {
+ /* Copy the procname */
+ new->procname = path->procname;
+ new->ctl_name = path->ctl_name;
+ new->mode = 0555;
+
+ *prevp = new;
+ prevp = &new->child;
+
+ new += 2;
+ }
+ *prevp = table;
+
+ INIT_LIST_HEAD(&header->ctl_entry);
+ header->used = 0;
+ header->unregistering = NULL;
+ sysctl_set_parent(NULL, header->ctl_table);
+ if (sysctl_check_table(header->ctl_table)) {
+ kfree(header);
return NULL;
}
spin_lock(&sysctl_lock);
- list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
+ list_add_tail(&header->ctl_entry, &root_table_header.ctl_entry);
spin_unlock(&sysctl_lock);
- return tmp;
+
+ return header;
+}
+
+/**
+ * register_sysctl_table - register a sysctl table hierarchy
+ * @table: the top-level table structure
+ *
+ * Register a sysctl table hierarchy. @table should be a filled in ctl_table
+ * array. A completely 0 filled entry terminates the table.
+ *
+ * See register_sysctl_paths for more details.
+ */
+struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
+{
+ static const struct ctl_path null_path[] = { {} };
+
+ return register_sysctl_paths(null_path, table);
}
/**
@@ -1675,6 +1727,12 @@ struct ctl_table_header *register_sysctl_table(struct
ctl_table * table)
return NULL;
}
+struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
+ struct ctl_table *table)
+{
+ return NULL;
+}
+
void unregister_sysctl_table(struct ctl_table_header * table)
{
}
@@ -2733,6 +2791,7 @@ EXPORT_SYMBOL(proc_dostring);
EXPORT_SYMBOL(proc_doulongvec_minmax);
EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
EXPORT_SYMBOL(register_sysctl_table);
+EXPORT_SYMBOL(register_sysctl_paths);
EXPORT_SYMBOL(sysctl_intvec);
EXPORT_SYMBOL(sysctl_jiffies);
EXPORT_SYMBOL(sysctl_ms_jiffies);
-
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