ocfs2: constify struct ocfs2_lock_res_ops

"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>

diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index cb40cafbc06237fe7e72e913960376e118f59454..da78a04d6f0b0eabd1fc159b309a58e46c7366ff 100644 (file)
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -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:

diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 8fe826143d7bf4e0f33ca338b0271669b0269494..51c52768132d70289368d06bdfc9c22462044145 100644 (file)
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -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;