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Message-Id: <20170315050300.26516-1-ebiggers3@gmail.com>
Date: Tue, 14 Mar 2017 22:03:00 -0700
From: Eric Biggers <ebiggers3@...il.com>
To: linux-ext4@...r.kernel.org
Cc: Theodore Ts'o <tytso@....edu>,
Andreas Dilger <adilger.kernel@...ger.ca>,
Eric Biggers <ebiggers@...gle.com>
Subject: [PATCH] ext4: constify static data that is never modified
From: Eric Biggers <ebiggers@...gle.com>
Constify static data in ext4 that is never (intentionally) modified so
that it is placed in .rodata and benefits from memory protection.
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
fs/ext4/ext4.h | 4 ++--
fs/ext4/mballoc.c | 2 +-
fs/ext4/super.c | 5 +++--
fs/ext4/sysfs.c | 8 ++++----
fs/ext4/xattr.c | 2 +-
5 files changed, 11 insertions(+), 10 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index f493af666591..55f41bb14a5f 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2366,7 +2366,7 @@ static inline void ext4_update_dx_flag(struct inode *inode)
if (!ext4_has_feature_dir_index(inode->i_sb))
ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
}
-static unsigned char ext4_filetype_table[] = {
+static const unsigned char ext4_filetype_table[] = {
DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
};
@@ -3050,7 +3050,7 @@ extern int ext4_handle_dirty_dirent_node(handle_t *handle,
struct inode *inode,
struct buffer_head *bh);
#define S_SHIFT 12
-static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
+static const unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
[S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
[S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
[S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 354dc1a894c2..dbe51301c2bb 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -357,7 +357,7 @@ static struct kmem_cache *ext4_free_data_cachep;
#define NR_GRPINFO_CACHES 8
static struct kmem_cache *ext4_groupinfo_caches[NR_GRPINFO_CACHES];
-static const char *ext4_groupinfo_slab_names[NR_GRPINFO_CACHES] = {
+static const char * const ext4_groupinfo_slab_names[NR_GRPINFO_CACHES] = {
"ext4_groupinfo_1k", "ext4_groupinfo_2k", "ext4_groupinfo_4k",
"ext4_groupinfo_8k", "ext4_groupinfo_16k", "ext4_groupinfo_32k",
"ext4_groupinfo_64k", "ext4_groupinfo_128k"
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 2e03a0a88d92..b3af13f808f1 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1210,7 +1210,7 @@ static const struct fscrypt_operations ext4_cryptops = {
#endif
#ifdef CONFIG_QUOTA
-static char *quotatypes[] = INITQFNAMES;
+static const char * const quotatypes[] = INITQFNAMES;
#define QTYPE2NAME(t) (quotatypes[t])
static int ext4_write_dquot(struct dquot *dquot);
@@ -1424,7 +1424,8 @@ static ext4_fsblk_t get_sb_block(void **data)
}
#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
-static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
+static const char deprecated_msg[] =
+ "Mount option \"%s\" will be removed by %s\n"
"Contact linux-ext4@...r.kernel.org if you think we should keep it.\n";
#ifdef CONFIG_QUOTA
diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
index 42145be5c6b4..d74dc5f81a04 100644
--- a/fs/ext4/sysfs.c
+++ b/fs/ext4/sysfs.c
@@ -34,7 +34,7 @@ typedef enum {
ptr_ext4_super_block_offset,
} attr_ptr_t;
-static const char *proc_dirname = "fs/ext4";
+static const char proc_dirname[] = "fs/ext4";
static struct proc_dir_entry *ext4_proc_root;
struct ext4_attr {
@@ -375,7 +375,7 @@ static const struct file_operations ext4_seq_##name##_fops = { \
PROC_FILE_SHOW_DEFN(es_shrinker_info);
PROC_FILE_SHOW_DEFN(options);
-static struct ext4_proc_files {
+static const struct ext4_proc_files {
const char *name;
const struct file_operations *fops;
} proc_files[] = {
@@ -388,7 +388,7 @@ static struct ext4_proc_files {
int ext4_register_sysfs(struct super_block *sb)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
- struct ext4_proc_files *p;
+ const struct ext4_proc_files *p;
int err;
sbi->s_kobj.kset = &ext4_kset;
@@ -412,7 +412,7 @@ int ext4_register_sysfs(struct super_block *sb)
void ext4_unregister_sysfs(struct super_block *sb)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
- struct ext4_proc_files *p;
+ const struct ext4_proc_files *p;
if (sbi->s_proc) {
for (p = proc_files; p->name; p++)
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 67636acf7624..9ab8f334233b 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -81,7 +81,7 @@ static void ext4_xattr_rehash(struct ext4_xattr_header *,
static int ext4_xattr_list(struct dentry *dentry, char *buffer,
size_t buffer_size);
-static const struct xattr_handler *ext4_xattr_handler_map[] = {
+static const struct xattr_handler * const ext4_xattr_handler_map[] = {
[EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler,
#ifdef CONFIG_EXT4_FS_POSIX_ACL
[EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
--
2.12.0
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