Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * eCryptfs: Linux filesystem encryption layer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (C) 1997-2003 Erez Zadok
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Copyright (C) 2001-2003 Stony Brook University
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * Copyright (C) 2004-2006 International Business Machines Corp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/dcache.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/namei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/fs_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include "ecryptfs_kernel.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  * ecryptfs_d_revalidate - revalidate an ecryptfs dentry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  * @dentry: The ecryptfs dentry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * @flags: lookup flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  * Called when the VFS needs to revalidate a dentry. This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)  * is called whenever a name lookup finds a dentry in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)  * dcache. Most filesystems leave this as NULL, because all their
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)  * dentries in the dcache are valid.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)  * Returns 1 if valid, 0 otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static int ecryptfs_d_revalidate(struct dentry *dentry, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	int rc = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	if (flags & LOOKUP_RCU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		return -ECHILD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	if (lower_dentry->d_flags & DCACHE_OP_REVALIDATE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		rc = lower_dentry->d_op->d_revalidate(lower_dentry, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	if (d_really_is_positive(dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		struct inode *inode = d_inode(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		fsstack_copy_attr_all(inode, ecryptfs_inode_to_lower(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		if (!inode->i_nlink)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct kmem_cache *ecryptfs_dentry_info_cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static void ecryptfs_dentry_free_rcu(struct rcu_head *head)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	kmem_cache_free(ecryptfs_dentry_info_cache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 		container_of(head, struct ecryptfs_dentry_info, rcu));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)  * ecryptfs_d_release
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)  * @dentry: The ecryptfs dentry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)  * Called when a dentry is really deallocated.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) static void ecryptfs_d_release(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	struct ecryptfs_dentry_info *p = dentry->d_fsdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	if (p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 		path_put(&p->lower_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 		call_rcu(&p->rcu, ecryptfs_dentry_free_rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) const struct dentry_operations ecryptfs_dops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	.d_revalidate = ecryptfs_d_revalidate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 	.d_release = ecryptfs_d_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) };