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-rw-r--r--fs/efivarfs/inode.c3
-rw-r--r--fs/efivarfs/internal.h8
-rw-r--r--fs/efivarfs/super.c66
-rw-r--r--fs/efivarfs/vars.c5
4 files changed, 63 insertions, 19 deletions
diff --git a/fs/efivarfs/inode.c b/fs/efivarfs/inode.c
index 91290fe4a70b..586446e02ef7 100644
--- a/fs/efivarfs/inode.c
+++ b/fs/efivarfs/inode.c
@@ -77,6 +77,7 @@ bool efivarfs_valid_name(const char *str, int len)
static int efivarfs_create(struct mnt_idmap *idmap, struct inode *dir,
struct dentry *dentry, umode_t mode, bool excl)
{
+ struct efivarfs_fs_info *info = dir->i_sb->s_fs_info;
struct inode *inode = NULL;
struct efivar_entry *var;
int namelen, i = 0, err = 0;
@@ -118,7 +119,7 @@ static int efivarfs_create(struct mnt_idmap *idmap, struct inode *dir,
inode->i_private = var;
kmemleak_ignore(var);
- err = efivar_entry_add(var, &efivarfs_list);
+ err = efivar_entry_add(var, &info->efivarfs_list);
if (err)
goto out;
diff --git a/fs/efivarfs/internal.h b/fs/efivarfs/internal.h
index c66647f5c0bd..169252e6dc46 100644
--- a/fs/efivarfs/internal.h
+++ b/fs/efivarfs/internal.h
@@ -16,6 +16,9 @@ struct efivarfs_mount_opts {
struct efivarfs_fs_info {
struct efivarfs_mount_opts mount_opts;
+ struct list_head efivarfs_list;
+ struct super_block *sb;
+ struct notifier_block nb;
};
struct efi_variable {
@@ -33,7 +36,8 @@ struct efivar_entry {
struct kobject kobj;
};
-int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
+int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *,
+ struct list_head *),
void *data, bool duplicates, struct list_head *head);
int efivar_entry_add(struct efivar_entry *entry, struct list_head *head);
@@ -64,6 +68,4 @@ extern struct inode *efivarfs_get_inode(struct super_block *sb,
const struct inode *dir, int mode, dev_t dev,
bool is_removable);
-extern struct list_head efivarfs_list;
-
#endif /* EFIVAR_FS_INTERNAL_H */
diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c
index 77240953a92e..6038dd39367a 100644
--- a/fs/efivarfs/super.c
+++ b/fs/efivarfs/super.c
@@ -15,10 +15,29 @@
#include <linux/slab.h>
#include <linux/magic.h>
#include <linux/statfs.h>
+#include <linux/notifier.h>
+#include <linux/printk.h>
#include "internal.h"
-LIST_HEAD(efivarfs_list);
+static int efivarfs_ops_notifier(struct notifier_block *nb, unsigned long event,
+ void *data)
+{
+ struct efivarfs_fs_info *sfi = container_of(nb, struct efivarfs_fs_info, nb);
+
+ switch (event) {
+ case EFIVAR_OPS_RDONLY:
+ sfi->sb->s_flags |= SB_RDONLY;
+ break;
+ case EFIVAR_OPS_RDWR:
+ sfi->sb->s_flags &= ~SB_RDONLY;
+ break;
+ default:
+ return NOTIFY_DONE;
+ }
+
+ return NOTIFY_OK;
+}
static void efivarfs_evict_inode(struct inode *inode)
{
@@ -166,7 +185,8 @@ static struct dentry *efivarfs_alloc_dentry(struct dentry *parent, char *name)
}
static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor,
- unsigned long name_size, void *data)
+ unsigned long name_size, void *data,
+ struct list_head *list)
{
struct super_block *sb = (struct super_block *)data;
struct efivar_entry *entry;
@@ -221,7 +241,7 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor,
}
__efivar_entry_get(entry, NULL, &size, NULL);
- __efivar_entry_add(entry, &efivarfs_list);
+ __efivar_entry_add(entry, list);
/* copied by the above to local storage in the dentry. */
kfree(name);
@@ -291,13 +311,11 @@ static int efivarfs_parse_param(struct fs_context *fc, struct fs_parameter *para
static int efivarfs_fill_super(struct super_block *sb, struct fs_context *fc)
{
+ struct efivarfs_fs_info *sfi = sb->s_fs_info;
struct inode *inode = NULL;
struct dentry *root;
int err;
- if (!efivar_is_available())
- return -EOPNOTSUPP;
-
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_blocksize = PAGE_SIZE;
sb->s_blocksize_bits = PAGE_SHIFT;
@@ -319,11 +337,16 @@ static int efivarfs_fill_super(struct super_block *sb, struct fs_context *fc)
if (!root)
return -ENOMEM;
- INIT_LIST_HEAD(&efivarfs_list);
+ sfi->sb = sb;
+ sfi->nb.notifier_call = efivarfs_ops_notifier;
+ err = blocking_notifier_chain_register(&efivar_ops_nh, &sfi->nb);
+ if (err)
+ return err;
- err = efivar_init(efivarfs_callback, (void *)sb, true, &efivarfs_list);
+ err = efivar_init(efivarfs_callback, (void *)sb, true,
+ &sfi->efivarfs_list);
if (err)
- efivar_entry_iter(efivarfs_destroy, &efivarfs_list, NULL);
+ efivar_entry_iter(efivarfs_destroy, &sfi->efivarfs_list, NULL);
return err;
}
@@ -333,19 +356,35 @@ static int efivarfs_get_tree(struct fs_context *fc)
return get_tree_single(fc, efivarfs_fill_super);
}
+static int efivarfs_reconfigure(struct fs_context *fc)
+{
+ if (!efivar_supports_writes() && !(fc->sb_flags & SB_RDONLY)) {
+ pr_err("Firmware does not support SetVariableRT. Can not remount with rw\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static const struct fs_context_operations efivarfs_context_ops = {
.get_tree = efivarfs_get_tree,
.parse_param = efivarfs_parse_param,
+ .reconfigure = efivarfs_reconfigure,
};
static int efivarfs_init_fs_context(struct fs_context *fc)
{
struct efivarfs_fs_info *sfi;
+ if (!efivar_is_available())
+ return -EOPNOTSUPP;
+
sfi = kzalloc(sizeof(*sfi), GFP_KERNEL);
if (!sfi)
return -ENOMEM;
+ INIT_LIST_HEAD(&sfi->efivarfs_list);
+
sfi->mount_opts.uid = GLOBAL_ROOT_UID;
sfi->mount_opts.gid = GLOBAL_ROOT_GID;
@@ -356,13 +395,14 @@ static int efivarfs_init_fs_context(struct fs_context *fc)
static void efivarfs_kill_sb(struct super_block *sb)
{
- kill_litter_super(sb);
+ struct efivarfs_fs_info *sfi = sb->s_fs_info;
- if (!efivar_is_available())
- return;
+ blocking_notifier_chain_unregister(&efivar_ops_nh, &sfi->nb);
+ kill_litter_super(sb);
/* Remove all entries and destroy */
- efivar_entry_iter(efivarfs_destroy, &efivarfs_list, NULL);
+ efivar_entry_iter(efivarfs_destroy, &sfi->efivarfs_list, NULL);
+ kfree(sfi);
}
static struct file_system_type efivarfs_type = {
diff --git a/fs/efivarfs/vars.c b/fs/efivarfs/vars.c
index 9e4f47808bd5..114ff0fd4e55 100644
--- a/fs/efivarfs/vars.c
+++ b/fs/efivarfs/vars.c
@@ -369,7 +369,8 @@ static void dup_variable_bug(efi_char16_t *str16, efi_guid_t *vendor_guid,
*
* Returns 0 on success, or a kernel error code on failure.
*/
-int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
+int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *,
+ struct list_head *),
void *data, bool duplicates, struct list_head *head)
{
unsigned long variable_name_size = 1024;
@@ -420,7 +421,7 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
status = EFI_NOT_FOUND;
} else {
err = func(variable_name, vendor_guid,
- variable_name_size, data);
+ variable_name_size, data, head);
if (err)
status = EFI_NOT_FOUND;
}
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2024-12-28 16:35:23 +0000