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TOMOYO Linux Cross Reference
Linux/fs/ecryptfs/dentry.c

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  1 /**
  2  * eCryptfs: Linux filesystem encryption layer
  3  *
  4  * Copyright (C) 1997-2003 Erez Zadok
  5  * Copyright (C) 2001-2003 Stony Brook University
  6  * Copyright (C) 2004-2006 International Business Machines Corp.
  7  *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
  8  *
  9  * This program is free software; you can redistribute it and/or
 10  * modify it under the terms of the GNU General Public License as
 11  * published by the Free Software Foundation; either version 2 of the
 12  * License, or (at your option) any later version.
 13  *
 14  * This program is distributed in the hope that it will be useful, but
 15  * WITHOUT ANY WARRANTY; without even the implied warranty of
 16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 17  * General Public License for more details.
 18  *
 19  * You should have received a copy of the GNU General Public License
 20  * along with this program; if not, write to the Free Software
 21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 22  * 02111-1307, USA.
 23  */
 24 
 25 #include <linux/dcache.h>
 26 #include <linux/namei.h>
 27 #include <linux/mount.h>
 28 #include <linux/fs_stack.h>
 29 #include <linux/slab.h>
 30 #include "ecryptfs_kernel.h"
 31 
 32 /**
 33  * ecryptfs_d_revalidate - revalidate an ecryptfs dentry
 34  * @dentry: The ecryptfs dentry
 35  * @flags: lookup flags
 36  *
 37  * Called when the VFS needs to revalidate a dentry. This
 38  * is called whenever a name lookup finds a dentry in the
 39  * dcache. Most filesystems leave this as NULL, because all their
 40  * dentries in the dcache are valid.
 41  *
 42  * Returns 1 if valid, 0 otherwise.
 43  *
 44  */
 45 static int ecryptfs_d_revalidate(struct dentry *dentry, unsigned int flags)
 46 {
 47         struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 48         int rc = 1;
 49 
 50         if (flags & LOOKUP_RCU)
 51                 return -ECHILD;
 52 
 53         if (lower_dentry->d_flags & DCACHE_OP_REVALIDATE)
 54                 rc = lower_dentry->d_op->d_revalidate(lower_dentry, flags);
 55 
 56         if (d_really_is_positive(dentry)) {
 57                 struct inode *inode = d_inode(dentry);
 58 
 59                 fsstack_copy_attr_all(inode, ecryptfs_inode_to_lower(inode));
 60                 if (!inode->i_nlink)
 61                         return 0;
 62         }
 63         return rc;
 64 }
 65 
 66 struct kmem_cache *ecryptfs_dentry_info_cache;
 67 
 68 static void ecryptfs_dentry_free_rcu(struct rcu_head *head)
 69 {
 70         kmem_cache_free(ecryptfs_dentry_info_cache,
 71                 container_of(head, struct ecryptfs_dentry_info, rcu));
 72 }
 73 
 74 /**
 75  * ecryptfs_d_release
 76  * @dentry: The ecryptfs dentry
 77  *
 78  * Called when a dentry is really deallocated.
 79  */
 80 static void ecryptfs_d_release(struct dentry *dentry)
 81 {
 82         struct ecryptfs_dentry_info *p = dentry->d_fsdata;
 83         if (p) {
 84                 path_put(&p->lower_path);
 85                 call_rcu(&p->rcu, ecryptfs_dentry_free_rcu);
 86         }
 87 }
 88 
 89 const struct dentry_operations ecryptfs_dops = {
 90         .d_revalidate = ecryptfs_d_revalidate,
 91         .d_release = ecryptfs_d_release,
 92 };
 93 

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