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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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0e4f948395
Allow efivarfs to partake to resync variable state during system hibernation and suspend. Add freeze/thaw support. This is a pretty straightforward implementation. We simply add regular freeze/thaw support for both userspace and the kernel. This works without any big issues and congrats afaict efivars is the first pseudofilesystem that adds support for filesystem freezing and thawing. The simplicity comes from the fact that we simply always resync variable state after efivarfs has been frozen. It doesn't matter whether that's because of suspend, userspace initiated freeze or hibernation. Efivars is simple enough that it doesn't matter that we walk all dentries. There are no directories and there aren't insane amounts of entries and both freeze/thaw are already heavy-handed operations. We really really don't need to care. Link: https://lore.kernel.org/r/20250331-work-freeze-v1-2-6dfbe8253b9f@kernel.org Signed-off-by: Christian Brauner <brauner@kernel.org>
67 lines
2 KiB
C
67 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 Red Hat, Inc.
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* Copyright (C) 2012 Jeremy Kerr <jeremy.kerr@canonical.com>
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*/
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#ifndef EFIVAR_FS_INTERNAL_H
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#define EFIVAR_FS_INTERNAL_H
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#include <linux/efi.h>
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struct efivarfs_mount_opts {
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kuid_t uid;
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kgid_t gid;
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};
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struct efivarfs_fs_info {
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struct efivarfs_mount_opts mount_opts;
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struct super_block *sb;
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struct notifier_block nb;
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};
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struct efi_variable {
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efi_char16_t VariableName[EFI_VAR_NAME_LEN/sizeof(efi_char16_t)];
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efi_guid_t VendorGuid;
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};
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struct efivar_entry {
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struct efi_variable var;
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struct inode vfs_inode;
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unsigned long open_count;
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bool removed;
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};
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static inline struct efivar_entry *efivar_entry(struct inode *inode)
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{
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return container_of(inode, struct efivar_entry, vfs_inode);
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}
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int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
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void *data, bool duplicate_check);
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int efivar_entry_delete(struct efivar_entry *entry);
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int efivar_entry_size(struct efivar_entry *entry, unsigned long *size);
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int __efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
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unsigned long *size, void *data);
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int efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
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unsigned long *size, void *data);
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int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
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unsigned long *size, void *data, bool *set);
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bool efivar_validate(efi_guid_t vendor, efi_char16_t *var_name, u8 *data,
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unsigned long data_size);
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bool efivar_variable_is_removable(efi_guid_t vendor, const char *name,
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size_t len);
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char *efivar_get_utf8name(const efi_char16_t *name16, efi_guid_t *vendor);
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bool efivarfs_variable_is_present(efi_char16_t *variable_name,
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efi_guid_t *vendor, void *data);
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extern const struct file_operations efivarfs_file_operations;
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extern const struct inode_operations efivarfs_dir_inode_operations;
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extern struct inode *efivarfs_get_inode(struct super_block *sb,
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const struct inode *dir, int mode, dev_t dev,
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bool is_removable);
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#endif /* EFIVAR_FS_INTERNAL_H */
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