projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 237fead6 MH |
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 <[email protected]> | |
| 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> | |
| 45ec4aba | 27 | #include <linux/mount.h> |
| 0cc72dc7 | 28 | #include <linux/fs_stack.h> |
| 5a0e3ad6 | 29 | #include <linux/slab.h> |
| 237fead6 MH |
30 | #include "ecryptfs_kernel.h" |
| 31 | ||
| 32 | /** | |
| 33 | * ecryptfs_d_revalidate - revalidate an ecryptfs dentry | |
| 34 | * @dentry: The ecryptfs dentry | |
| 0b728e19 | 35 | * @flags: lookup flags |
| 237fead6 MH |
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 | */ | |
| 0b728e19 | 45 | static int ecryptfs_d_revalidate(struct dentry *dentry, unsigned int flags) |
| 237fead6 | 46 | { |
| 2edbfbf1 | 47 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 5556e7e6 | 48 | int rc = 1; |
| 237fead6 | 49 | |
| 0b728e19 | 50 | if (flags & LOOKUP_RCU) |
| 34286d66 NP |
51 | return -ECHILD; |
| 52 | ||
| 5556e7e6 TH |
53 | if (lower_dentry->d_flags & DCACHE_OP_REVALIDATE) |
| 54 | rc = lower_dentry->d_op->d_revalidate(lower_dentry, flags); | |
| 55 | ||
| 2b0143b5 | 56 | if (d_really_is_positive(dentry)) { |
| 5556e7e6 | 57 | struct inode *inode = d_inode(dentry); |
| ae56fb16 | 58 | |
| 5556e7e6 TH |
59 | fsstack_copy_attr_all(inode, ecryptfs_inode_to_lower(inode)); |
| 60 | if (!inode->i_nlink) | |
| 61 | return 0; | |
| ae56fb16 | 62 | } |
| 237fead6 MH |
63 | return rc; |
| 64 | } | |
| 65 | ||
| 66 | struct kmem_cache *ecryptfs_dentry_info_cache; | |
| 67 | ||
| 2edbfbf1 AV |
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 | ||
| 237fead6 MH |
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 | { | |
| 2edbfbf1 AV |
82 | struct ecryptfs_dentry_info *p = dentry->d_fsdata; |
| 83 | if (p) { | |
| cbe9c085 | 84 | path_put(&p->lower_path); |
| 2edbfbf1 | 85 | call_rcu(&p->rcu, ecryptfs_dentry_free_rcu); |
| 45ec4aba | 86 | } |
| 237fead6 MH |
87 | } |
| 88 | ||
| 5a3fd05a | 89 | const struct dentry_operations ecryptfs_dops = { |
| 237fead6 MH |
90 | .d_revalidate = ecryptfs_d_revalidate, |
| 91 | .d_release = ecryptfs_d_release, | |
| 92 | }; |