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ocfs2: constify struct ocfs2_lock_res_ops

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"struct ocfs2_lock_res_ops" are not modified in this driver.

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

In order to do it, "struct ocfs2_lock_res" also needs to be adjusted to
this new const qualifier.

On a x86_64, with allmodconfig:
Before:
======
   text	   data	    bss	    dec	    hex	filename
  83038	   2632	    400	  86070	  15036	fs/ocfs2/dlmglue.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
  83806	   1992	    272	  86070	  15036	fs/ocfs2/dlmglue.o

Link: https://lkml.kernel.org/r/43d3e2ae3a97d3cbe93d6ba6ce48ae5ec04d7526.1718382288.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joseph Qi <jiangqi903@gmail.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Christophe JAILLET 2024-06-14 18:25:07 +02:00 committed by Andrew Morton
parent c8dab79f9e
commit 3ebe69c0c3
2 changed files with 15 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
fs/ocfs2/dlmglue.c
View File

@ -221,12 +221,12 @@ struct ocfs2_lock_res_ops {
*/
#define LOCK_TYPE_USES_LVB 0x2
static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = {
static const struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = {
.get_osb = ocfs2_get_inode_osb,
.flags = 0,
};
static struct ocfs2_lock_res_ops ocfs2_inode_inode_lops = {
static const struct ocfs2_lock_res_ops ocfs2_inode_inode_lops = {
.get_osb = ocfs2_get_inode_osb,
.check_downconvert = ocfs2_check_meta_downconvert,
.set_lvb = ocfs2_set_meta_lvb,
@ -234,50 +234,50 @@ static struct ocfs2_lock_res_ops ocfs2_inode_inode_lops = {
.flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB,
};
static struct ocfs2_lock_res_ops ocfs2_super_lops = {
static const struct ocfs2_lock_res_ops ocfs2_super_lops = {
.flags = LOCK_TYPE_REQUIRES_REFRESH,
};
static struct ocfs2_lock_res_ops ocfs2_rename_lops = {
static const struct ocfs2_lock_res_ops ocfs2_rename_lops = {
.flags = 0,
};
static struct ocfs2_lock_res_ops ocfs2_nfs_sync_lops = {
static const struct ocfs2_lock_res_ops ocfs2_nfs_sync_lops = {
.flags = 0,
};
static struct ocfs2_lock_res_ops ocfs2_trim_fs_lops = {
static const struct ocfs2_lock_res_ops ocfs2_trim_fs_lops = {
.flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB,
};
static struct ocfs2_lock_res_ops ocfs2_orphan_scan_lops = {
static const struct ocfs2_lock_res_ops ocfs2_orphan_scan_lops = {
.flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB,
};
static struct ocfs2_lock_res_ops ocfs2_dentry_lops = {
static const struct ocfs2_lock_res_ops ocfs2_dentry_lops = {
.get_osb = ocfs2_get_dentry_osb,
.post_unlock = ocfs2_dentry_post_unlock,
.downconvert_worker = ocfs2_dentry_convert_worker,
.flags = 0,
};
static struct ocfs2_lock_res_ops ocfs2_inode_open_lops = {
static const struct ocfs2_lock_res_ops ocfs2_inode_open_lops = {
.get_osb = ocfs2_get_inode_osb,
.flags = 0,
};
static struct ocfs2_lock_res_ops ocfs2_flock_lops = {
static const struct ocfs2_lock_res_ops ocfs2_flock_lops = {
.get_osb = ocfs2_get_file_osb,
.flags = 0,
};
static struct ocfs2_lock_res_ops ocfs2_qinfo_lops = {
static const struct ocfs2_lock_res_ops ocfs2_qinfo_lops = {
.set_lvb = ocfs2_set_qinfo_lvb,
.get_osb = ocfs2_get_qinfo_osb,
.flags = LOCK_TYPE_REQUIRES_REFRESH | LOCK_TYPE_USES_LVB,
};
static struct ocfs2_lock_res_ops ocfs2_refcount_block_lops = {
static const struct ocfs2_lock_res_ops ocfs2_refcount_block_lops = {
.check_downconvert = ocfs2_check_refcount_downconvert,
.downconvert_worker = ocfs2_refcount_convert_worker,
.flags = 0,
@ -510,7 +510,7 @@ static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw)
static void ocfs2_lock_res_init_common(struct ocfs2_super *osb,
struct ocfs2_lock_res *res,
enum ocfs2_lock_type type,
struct ocfs2_lock_res_ops *ops,
const struct ocfs2_lock_res_ops *ops,
void *priv)
{
res->l_type = type;
@ -553,7 +553,7 @@ void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
unsigned int generation,
struct inode *inode)
{
struct ocfs2_lock_res_ops *ops;
const struct ocfs2_lock_res_ops *ops;
switch(type) {
case OCFS2_LOCK_TYPE_RW:

2
fs/ocfs2/ocfs2.h
View File

@ -154,7 +154,7 @@ struct ocfs2_lock_stats {
struct ocfs2_lock_res {
void *l_priv;
struct ocfs2_lock_res_ops *l_ops;
const struct ocfs2_lock_res_ops *l_ops;
struct list_head l_blocked_list;