diff options
Diffstat (limited to 'fs/efivarfs')
| -rw-r--r-- | fs/efivarfs/internal.h | 2 | ||||
| -rw-r--r-- | fs/efivarfs/super.c | 27 |
2 files changed, 29 insertions, 0 deletions
diff --git a/fs/efivarfs/internal.h b/fs/efivarfs/internal.h index 1dc0ccce3cc3..169252e6dc46 100644 --- a/fs/efivarfs/internal.h +++ b/fs/efivarfs/internal.h @@ -17,6 +17,8 @@ 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 { diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c index cee325b5bbdd..6038dd39367a 100644 --- a/fs/efivarfs/super.c +++ b/fs/efivarfs/super.c @@ -15,10 +15,30 @@ #include <linux/slab.h> #include <linux/magic.h> #include <linux/statfs.h> +#include <linux/notifier.h> #include <linux/printk.h> #include "internal.h" +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) { clear_inode(inode); @@ -317,6 +337,12 @@ static int efivarfs_fill_super(struct super_block *sb, struct fs_context *fc) if (!root) return -ENOMEM; + 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, &sfi->efivarfs_list); if (err) @@ -371,6 +397,7 @@ static void efivarfs_kill_sb(struct super_block *sb) { struct efivarfs_fs_info *sfi = sb->s_fs_info; + blocking_notifier_chain_unregister(&efivar_ops_nh, &sfi->nb); kill_litter_super(sb); /* Remove all entries and destroy */ |