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92 lines
2.6 KiB
92 lines
2.6 KiB
/** |
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* eCryptfs: Linux filesystem encryption layer |
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* |
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* Copyright (C) 1997-2003 Erez Zadok |
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* Copyright (C) 2001-2003 Stony Brook University |
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* Copyright (C) 2004-2006 International Business Machines Corp. |
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* Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation; either version 2 of the |
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* License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
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* 02111-1307, USA. |
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*/ |
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#include <linux/dcache.h> |
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#include <linux/namei.h> |
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#include <linux/mount.h> |
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#include <linux/fs_stack.h> |
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#include <linux/slab.h> |
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#include "ecryptfs_kernel.h" |
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/** |
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* ecryptfs_d_revalidate - revalidate an ecryptfs dentry |
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* @dentry: The ecryptfs dentry |
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* @flags: lookup flags |
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* |
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* Called when the VFS needs to revalidate a dentry. This |
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* is called whenever a name lookup finds a dentry in the |
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* dcache. Most filesystems leave this as NULL, because all their |
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* dentries in the dcache are valid. |
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* |
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* Returns 1 if valid, 0 otherwise. |
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* |
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*/ |
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static int ecryptfs_d_revalidate(struct dentry *dentry, unsigned int flags) |
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{ |
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struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
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int rc; |
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if (!(lower_dentry->d_flags & DCACHE_OP_REVALIDATE)) |
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return 1; |
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if (flags & LOOKUP_RCU) |
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return -ECHILD; |
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rc = lower_dentry->d_op->d_revalidate(lower_dentry, flags); |
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if (dentry->d_inode) { |
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struct inode *lower_inode = |
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ecryptfs_inode_to_lower(dentry->d_inode); |
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fsstack_copy_attr_all(dentry->d_inode, lower_inode); |
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} |
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return rc; |
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} |
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struct kmem_cache *ecryptfs_dentry_info_cache; |
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static void ecryptfs_dentry_free_rcu(struct rcu_head *head) |
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{ |
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kmem_cache_free(ecryptfs_dentry_info_cache, |
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container_of(head, struct ecryptfs_dentry_info, rcu)); |
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} |
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/** |
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* ecryptfs_d_release |
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* @dentry: The ecryptfs dentry |
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* |
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* Called when a dentry is really deallocated. |
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*/ |
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static void ecryptfs_d_release(struct dentry *dentry) |
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{ |
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struct ecryptfs_dentry_info *p = dentry->d_fsdata; |
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if (p) { |
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path_put(&p->lower_path); |
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call_rcu(&p->rcu, ecryptfs_dentry_free_rcu); |
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} |
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} |
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const struct dentry_operations ecryptfs_dops = { |
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.d_revalidate = ecryptfs_d_revalidate, |
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.d_release = ecryptfs_d_release, |
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};
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