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md-cluster: Constify struct md_cluster_operations

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'struct md_cluster_operations' is not modified in this driver.

Constifying this structure moves some data to a read-only section, so
increase overall security.

On a x86_64, with allmodconfig, as an example:
Before:
======
   text	   data	    bss	    dec	    hex	filename
  51941	   1442	     80	  53463	   d0d7	drivers/md/md-cluster.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
  52133	   1246	     80	  53459	   d0d3	drivers/md/md-cluster.o

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/3727f3ce9693cae4e62ae6778ea13971df805479.1719173852.git.christophe.jaillet@wanadoo.fr
This commit is contained in:
Christophe JAILLET 2024-06-23 22:17:54 +02:00 committed by Song Liu
parent ae720670b9
commit 1f4a72ff00
3 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/md/md-cluster.c
View File

@ -1570,7 +1570,7 @@ out:
return err;
}
static struct md_cluster_operations cluster_ops = {
static const struct md_cluster_operations cluster_ops = {
.join = join,
.leave = leave,
.slot_number = slot_number,

4
drivers/md/md.c
View File

@ -85,7 +85,7 @@ static DEFINE_SPINLOCK(pers_lock);
static const struct kobj_type md_ktype;
struct md_cluster_operations *md_cluster_ops;
const struct md_cluster_operations *md_cluster_ops;
EXPORT_SYMBOL(md_cluster_ops);
static struct module *md_cluster_mod;
@ -8543,7 +8543,7 @@ int unregister_md_personality(struct md_personality *p)
}
EXPORT_SYMBOL(unregister_md_personality);
int register_md_cluster_operations(struct md_cluster_operations *ops,
int register_md_cluster_operations(const struct md_cluster_operations *ops,
struct module *module)
{
int ret = 0;

4
drivers/md/md.h
View File

@ -849,7 +849,7 @@ static inline void safe_put_page(struct page *p)
extern int register_md_personality(struct md_personality *p);
extern int unregister_md_personality(struct md_personality *p);
extern int register_md_cluster_operations(struct md_cluster_operations *ops,
extern int register_md_cluster_operations(const struct md_cluster_operations *ops,
struct module *module);
extern int unregister_md_cluster_operations(void);
extern int md_setup_cluster(struct mddev *mddev, int nodes);
@ -932,7 +932,7 @@ static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev)
}
}
extern struct md_cluster_operations *md_cluster_ops;
extern const struct md_cluster_operations *md_cluster_ops;
static inline int mddev_is_clustered(struct mddev *mddev)
{
return mddev->cluster_info && mddev->bitmap_info.nodes > 1;