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Name	Size	Permission	Date
common	[ DIR ]	drwxr-xr-x	2025-10-28 18:03
ftrace_hooks	[ DIR ]	drwxr-xr-x	2025-10-28 18:03
lsm_hooks	[ DIR ]	drwxr-xr-x	2025-10-28 18:03
syscall_hooks	[ DIR ]	drwxr-xr-x	2025-10-28 18:03
transport	[ DIR ]	drwxr-xr-x	2025-10-28 18:03
Kbuild	10.29 KB	-rw-r--r--	2025-10-28 18:03
Makefile	2.23 KB	-rw-r--r--	2025-10-28 18:03
compat.c	8.42 KB	-rw-r--r--	2025-10-28 18:03
compat.h	11.98 KB	-rw-r--r--	2025-10-28 18:03
debug.h	3.56 KB	-rw-r--r--	2025-10-28 18:03
dkms.conf	146 B	-rw-r--r--	2025-10-28 18:03
file_contexts.c	60.43 KB	-rw-r--r--	2025-10-28 18:03
file_contexts.h	6.21 KB	-rw-r--r--	2025-10-28 18:03
file_contexts_priv.h	5.48 KB	-rw-r--r--	2025-10-28 18:03
file_handle_tools.h	2.53 KB	-rw-r--r--	2025-10-28 18:03
file_key_tools.h	950 B	-rw-r--r--	2025-10-28 18:03
file_path_tools.h	2.09 KB	-rw-r--r--	2025-10-28 18:03
hashtable_compat.h	2.73 KB	-rw-r--r--	2025-10-28 18:03
hook_trampoline_common.h	4.29 KB	-rw-r--r--	2025-10-28 18:03
interval_tree.h	779 B	-rw-r--r--	2025-10-28 18:03
memory.c	3.31 KB	-rw-r--r--	2025-10-28 18:03
memory.h	2.99 KB	-rw-r--r--	2025-10-28 18:03
module.c	2.67 KB	-rw-r--r--	2025-10-28 18:03
module_ref.h	421 B	-rw-r--r--	2025-10-28 18:03
module_rundown_protection.c	3.64 KB	-rw-r--r--	2025-10-28 18:03
module_rundown_protection.h	743 B	-rw-r--r--	2025-10-28 18:03
path_tools.h	6.06 KB	-rw-r--r--	2025-10-28 18:03
rundown_protection.c	4.2 KB	-rw-r--r--	2025-10-28 18:03
rundown_protection.h	2.83 KB	-rw-r--r--	2025-10-28 18:03
safe_kobject.h	1.28 KB	-rw-r--r--	2025-10-28 18:03
si_common.h	4.3 KB	-rw-r--r--	2025-10-28 18:03
si_fp_properties.h	858 B	-rw-r--r--	2025-10-28 18:03
si_fp_properties_x.h	18.53 KB	-rw-r--r--	2025-10-28 18:03
si_fp_value_types.h	515 B	-rw-r--r--	2025-10-28 18:03
si_fp_value_types_x.h	1.25 KB	-rw-r--r--	2025-10-28 18:03
si_size.h	4.26 KB	-rw-r--r--	2025-10-28 18:03
si_templates.h	2.99 KB	-rw-r--r--	2025-10-28 18:03
si_writer.h	7.52 KB	-rw-r--r--	2025-10-28 18:03
si_writer_common.h	14.63 KB	-rw-r--r--	2025-10-28 18:03
stringify.h	261 B	-rw-r--r--	2025-10-28 18:03
task_info_map.c	17.1 KB	-rw-r--r--	2025-10-28 18:03
task_info_map.h	6.33 KB	-rw-r--r--	2025-10-28 18:03
task_tools.h	1.34 KB	-rw-r--r--	2025-10-28 18:03
tracepoints.c	3.58 KB	-rw-r--r--	2025-10-28 18:03
tracepoints.h	299 B	-rw-r--r--	2025-10-28 18:03
write_protection.h	2.2 KB	-rw-r--r--	2025-10-28 18:03

Rename

/**
@file     file_handle_tools.h
@brief    Tools for creating and working with file handles
@details  Copyright (c) 2024 Acronis International GmbH
@author   Bruce Wang (bruce.wang@acronis.com)
@since    $Id: $
*/

#pragma once

#include "compat.h"
#include "memory.h"

typedef struct {
  uint32_t handle_bytes;
  int handle_type;
  int mnt_id;
  unsigned char* f_handle;
} file_handle_info_t;

#ifndef BPF_PROGRAM

// init_empty initialize message enough so 'free' can work
static inline void file_handle_info_init_empty(file_handle_info_t* info)
{
	info->f_handle = NULL;
}

#ifndef FILEID_INVALID
#define FILEID_INVALID 0xff
#endif

// It is a bit counterintuitive but 'info->mnt_id' is always filled in despite the return value.
// If 'f_handle' is non-null, it can be used
static inline int file_handle_info_make_with_alloc_flags(file_handle_info_t* info, const struct path *path, bool nowait)
{
	int dwords = MAX_HANDLE_SZ >> 2;
	struct dentry *dentry = path->dentry;
	struct vfsmount* mnt = path->mnt;

info->mnt_id = mnt ? get_mnt_id(mnt) : 0;
	info->f_handle = NULL;
	info->handle_bytes = 0;

#ifdef HAVE_EXPORTFS_ENCODE_INODE_FH
	if (!dentry || !dentry->d_inode || !dentry->d_inode->i_sb || !dentry->d_inode->i_sb->s_export_op) {
		return -EFAULT;
	}
#else
	if (!dentry || !dentry->d_sb || !dentry->d_sb->s_export_op) {
		return -EFAULT;
	}
#endif

info->f_handle = kmem_cache_alloc(g_handles_cache, mem_flags(nowait));
	if (!info->f_handle) {
		return -ENOMEM;
	}

// Returns an enum fid_type or a negative on errno.
	info->handle_type = exportfs_encode_fh(dentry, (struct fid *)info->f_handle, &dwords, 0);
	// original codes are here: https://elixir.bootlin.com/linux/v6.16.1/source/fs/fhandle.c#L64
	if (info->handle_type < 0 || info->handle_type == FILEID_INVALID)
	{
		goto err;
	}

info->handle_bytes = dwords * sizeof(u32);
	if (info->handle_bytes > MAX_HANDLE_SZ) {
		info->handle_bytes = MAX_HANDLE_SZ;
	}

return 0;

err:
	kmem_cache_free(g_handles_cache, info->f_handle);
	info->f_handle = NULL;
	info->handle_bytes = 0;
	return info->handle_type;
}

static inline int file_handle_info_make(file_handle_info_t* info, const struct path *path)
{
	return file_handle_info_make_with_alloc_flags(info, path, false /*nowait*/);
}

static inline int file_handle_info_make_nowait(file_handle_info_t* info, const struct path *path)
{
	return file_handle_info_make_with_alloc_flags(info, path, true /*nowait*/);
}

static inline void file_handle_info_free(file_handle_info_t* info) {
	if (info->f_handle) {
		kmem_cache_free(g_handles_cache, info->f_handle);
	}
}

#endif