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[03/11] sysctl: Add ctl_table_size to ctl_table_header

Message ID 20230621091000.424843-4-j.granados@samsung.com (mailing list archive)
State New, archived
Headers show
Series [01/11] sysctl: Prefer ctl_table_header in proc_sysctl | expand

Commit Message

Joel Granados June 21, 2023, 9:09 a.m. UTC 
The new ctl_table_size element will hold the size of the ctl_table
contained in the header. This value is passed by the callers to the
sysctl register infra.
Add a new macro that uses the size to traverse the ctl_table in the
header. This moves away from using the last empty element in the
ctl_table array as a stop post

Signed-off-by: Joel Granados <j.granados@samsung.com>
---
 include/linux/sysctl.h | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)
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Patch

diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 59d451f455bf..33252ad58ebe 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -159,12 +159,22 @@  struct ctl_node {
 	struct ctl_table_header *header;
 };
 
-/* struct ctl_table_header is used to maintain dynamic lists of
-   struct ctl_table trees. */
+/**
+ * struct ctl_table_header - maintains dynamic lists of struct ctl_table trees
+ * @ctl_table: pointer to the first element in ctl_table array
+ * @ctl_table_size: number of elements pointed by @ctl_table
+ * @used: The entry will never be touched when equal to 0.
+ * @count: Upped every time something is added to @inodes and downed every time
+ *         something is removed from inodes
+ * @nreg: When nreg drops to 0 the ctl_table_header will be unregistered.
+ * @rcu: Delays the freeing of the inode. Introduced with "unfuck proc_sysctl ->d_compare()"
+ *
+ */
 struct ctl_table_header {
 	union {
 		struct {
 			struct ctl_table *ctl_table;
+			int ctl_table_size;
 			int used;
 			int count;
 			int nreg;