Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1 | /** |
| 2 | * eCryptfs: Linux filesystem encryption layer |
| 3 | * |
| 4 | * Copyright (C) 1997-2004 Erez Zadok |
| 5 | * Copyright (C) 2001-2004 Stony Brook University |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 6 | * Copyright (C) 2004-2007 International Business Machines Corp. |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 7 | * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> |
| 8 | * Michael C. Thompsion <mcthomps@us.ibm.com> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License as |
| 12 | * published by the Free Software Foundation; either version 2 of the |
| 13 | * License, or (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, but |
| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
| 23 | * 02111-1307, USA. |
| 24 | */ |
| 25 | |
| 26 | #include <linux/file.h> |
| 27 | #include <linux/vmalloc.h> |
| 28 | #include <linux/pagemap.h> |
| 29 | #include <linux/dcache.h> |
| 30 | #include <linux/namei.h> |
| 31 | #include <linux/mount.h> |
| 32 | #include <linux/crypto.h> |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 33 | #include <linux/fs_stack.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 34 | #include <linux/slab.h> |
Roberto Sassu | 48b512e | 2010-10-05 18:53:45 +0200 | [diff] [blame^] | 35 | #include <linux/xattr.h> |
Harvey Harrison | 0a688ad | 2008-07-23 21:30:07 -0700 | [diff] [blame] | 36 | #include <asm/unaligned.h> |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 37 | #include "ecryptfs_kernel.h" |
| 38 | |
| 39 | static struct dentry *lock_parent(struct dentry *dentry) |
| 40 | { |
| 41 | struct dentry *dir; |
| 42 | |
Miklos Szeredi | 8dc4e37 | 2008-05-12 14:02:04 -0700 | [diff] [blame] | 43 | dir = dget_parent(dentry); |
Peter Zijlstra | 908e0a8 | 2007-03-07 20:41:30 -0800 | [diff] [blame] | 44 | mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 45 | return dir; |
| 46 | } |
| 47 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 48 | static void unlock_dir(struct dentry *dir) |
| 49 | { |
| 50 | mutex_unlock(&dir->d_inode->i_mutex); |
| 51 | dput(dir); |
| 52 | } |
| 53 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 54 | /** |
| 55 | * ecryptfs_create_underlying_file |
| 56 | * @lower_dir_inode: inode of the parent in the lower fs of the new file |
Qinghuang Feng | f70f582 | 2009-01-06 14:42:05 -0800 | [diff] [blame] | 57 | * @dentry: New file's dentry |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 58 | * @mode: The mode of the new file |
| 59 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount |
| 60 | * |
| 61 | * Creates the file in the lower file system. |
| 62 | * |
| 63 | * Returns zero on success; non-zero on error condition |
| 64 | */ |
| 65 | static int |
| 66 | ecryptfs_create_underlying_file(struct inode *lower_dir_inode, |
| 67 | struct dentry *dentry, int mode, |
| 68 | struct nameidata *nd) |
| 69 | { |
| 70 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 71 | struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); |
| 72 | struct dentry *dentry_save; |
| 73 | struct vfsmount *vfsmount_save; |
| 74 | int rc; |
| 75 | |
Jan Blunck | 4ac9137 | 2008-02-14 19:34:32 -0800 | [diff] [blame] | 76 | dentry_save = nd->path.dentry; |
| 77 | vfsmount_save = nd->path.mnt; |
| 78 | nd->path.dentry = lower_dentry; |
| 79 | nd->path.mnt = lower_mnt; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 80 | rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); |
Jan Blunck | 4ac9137 | 2008-02-14 19:34:32 -0800 | [diff] [blame] | 81 | nd->path.dentry = dentry_save; |
| 82 | nd->path.mnt = vfsmount_save; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 83 | return rc; |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * ecryptfs_do_create |
| 88 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs |
| 89 | * @ecryptfs_dentry: New file's dentry in ecryptfs |
| 90 | * @mode: The mode of the new file |
| 91 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount |
| 92 | * |
| 93 | * Creates the underlying file and the eCryptfs inode which will link to |
| 94 | * it. It will also update the eCryptfs directory inode to mimic the |
| 95 | * stat of the lower directory inode. |
| 96 | * |
| 97 | * Returns zero on success; non-zero on error condition |
| 98 | */ |
| 99 | static int |
| 100 | ecryptfs_do_create(struct inode *directory_inode, |
| 101 | struct dentry *ecryptfs_dentry, int mode, |
| 102 | struct nameidata *nd) |
| 103 | { |
| 104 | int rc; |
| 105 | struct dentry *lower_dentry; |
| 106 | struct dentry *lower_dir_dentry; |
| 107 | |
| 108 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); |
| 109 | lower_dir_dentry = lock_parent(lower_dentry); |
Hirofumi Nakagawa | 801678c | 2008-04-29 01:03:09 -0700 | [diff] [blame] | 110 | if (IS_ERR(lower_dir_dentry)) { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 111 | ecryptfs_printk(KERN_ERR, "Error locking directory of " |
| 112 | "dentry\n"); |
| 113 | rc = PTR_ERR(lower_dir_dentry); |
| 114 | goto out; |
| 115 | } |
| 116 | rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, |
| 117 | ecryptfs_dentry, mode, nd); |
Michael Halcrow | 4981e08 | 2007-10-16 01:28:09 -0700 | [diff] [blame] | 118 | if (rc) { |
Michael Halcrow | caeeeec | 2008-01-08 15:33:02 -0800 | [diff] [blame] | 119 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
Harvey Harrison | 18d1dbf | 2008-04-29 00:59:48 -0700 | [diff] [blame] | 120 | "rc = [%d]\n", __func__, rc); |
Michael Halcrow | caeeeec | 2008-01-08 15:33:02 -0800 | [diff] [blame] | 121 | goto out_lock; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 122 | } |
| 123 | rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, |
| 124 | directory_inode->i_sb, 0); |
| 125 | if (rc) { |
| 126 | ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); |
| 127 | goto out_lock; |
| 128 | } |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 129 | fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); |
| 130 | fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 131 | out_lock: |
| 132 | unlock_dir(lower_dir_dentry); |
| 133 | out: |
| 134 | return rc; |
| 135 | } |
| 136 | |
| 137 | /** |
| 138 | * grow_file |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 139 | * @ecryptfs_dentry: the eCryptfs dentry |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 140 | * |
| 141 | * This is the code which will grow the file to its correct size. |
| 142 | */ |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 143 | static int grow_file(struct dentry *ecryptfs_dentry) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 144 | { |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 145 | struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode; |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 146 | char zero_virt[] = { 0x00 }; |
| 147 | int rc = 0; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 148 | |
Al Viro | 48c1e44 | 2010-05-21 11:09:58 -0400 | [diff] [blame] | 149 | rc = ecryptfs_write(ecryptfs_inode, zero_virt, 0, 1); |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 150 | i_size_write(ecryptfs_inode, 0); |
| 151 | rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode); |
| 152 | ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |= |
| 153 | ECRYPTFS_NEW_FILE; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 154 | return rc; |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * ecryptfs_initialize_file |
| 159 | * |
| 160 | * Cause the file to be changed from a basic empty file to an ecryptfs |
| 161 | * file with a header and first data page. |
| 162 | * |
| 163 | * Returns zero on success |
| 164 | */ |
| 165 | static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) |
| 166 | { |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 167 | struct ecryptfs_crypt_stat *crypt_stat = |
| 168 | &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 169 | int rc = 0; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 170 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 171 | if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { |
| 172 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); |
Michael Halcrow | e2bd99e | 2007-02-12 00:53:49 -0800 | [diff] [blame] | 173 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 174 | goto out; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 175 | } |
Michael Halcrow | e2bd99e | 2007-02-12 00:53:49 -0800 | [diff] [blame] | 176 | crypt_stat->flags |= ECRYPTFS_NEW_FILE; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 177 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
| 178 | rc = ecryptfs_new_file_context(ecryptfs_dentry); |
| 179 | if (rc) { |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 180 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
| 181 | "context; rc = [%d]\n", rc); |
| 182 | goto out; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 183 | } |
Michael Halcrow | 391b52f | 2008-07-23 21:30:08 -0700 | [diff] [blame] | 184 | if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) { |
| 185 | rc = ecryptfs_init_persistent_file(ecryptfs_dentry); |
| 186 | if (rc) { |
| 187 | printk(KERN_ERR "%s: Error attempting to initialize " |
| 188 | "the persistent file for the dentry with name " |
| 189 | "[%s]; rc = [%d]\n", __func__, |
| 190 | ecryptfs_dentry->d_name.name, rc); |
| 191 | goto out; |
| 192 | } |
| 193 | } |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 194 | rc = ecryptfs_write_metadata(ecryptfs_dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 195 | if (rc) { |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 196 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
| 197 | goto out; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 198 | } |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 199 | rc = grow_file(ecryptfs_dentry); |
Michael Halcrow | 5dda699 | 2007-10-16 01:28:06 -0700 | [diff] [blame] | 200 | if (rc) |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 201 | printk(KERN_ERR "Error growing file; rc = [%d]\n", rc); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 202 | out: |
| 203 | return rc; |
| 204 | } |
| 205 | |
| 206 | /** |
| 207 | * ecryptfs_create |
| 208 | * @dir: The inode of the directory in which to create the file. |
| 209 | * @dentry: The eCryptfs dentry |
| 210 | * @mode: The mode of the new file. |
| 211 | * @nd: nameidata |
| 212 | * |
| 213 | * Creates a new file. |
| 214 | * |
| 215 | * Returns zero on success; non-zero on error condition |
| 216 | */ |
| 217 | static int |
| 218 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, |
| 219 | int mode, struct nameidata *nd) |
| 220 | { |
| 221 | int rc; |
| 222 | |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 223 | /* ecryptfs_do_create() calls ecryptfs_interpose() */ |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 224 | rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); |
| 225 | if (unlikely(rc)) { |
| 226 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" |
| 227 | "lower filesystem\n"); |
| 228 | goto out; |
| 229 | } |
| 230 | /* At this point, a file exists on "disk"; we need to make sure |
| 231 | * that this on disk file is prepared to be an ecryptfs file */ |
| 232 | rc = ecryptfs_initialize_file(ecryptfs_dentry); |
| 233 | out: |
| 234 | return rc; |
| 235 | } |
| 236 | |
| 237 | /** |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 238 | * ecryptfs_lookup_and_interpose_lower - Perform a lookup |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 239 | */ |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 240 | int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, |
| 241 | struct dentry *lower_dentry, |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 242 | struct inode *ecryptfs_dir_inode, |
| 243 | struct nameidata *ecryptfs_nd) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 244 | { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 245 | struct dentry *lower_dir_dentry; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 246 | struct vfsmount *lower_mnt; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 247 | struct inode *lower_inode; |
Michael Halcrow | e77a56d | 2007-02-12 00:53:47 -0800 | [diff] [blame] | 248 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
Tyler Hicks | 2aac0cf | 2009-03-20 02:23:57 -0500 | [diff] [blame] | 249 | struct ecryptfs_crypt_stat *crypt_stat; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 250 | char *page_virt = NULL; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 251 | u64 file_size; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 252 | int rc = 0; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 253 | |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 254 | lower_dir_dentry = lower_dentry->d_parent; |
| 255 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( |
| 256 | ecryptfs_dentry->d_parent)); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 257 | lower_inode = lower_dentry->d_inode; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 258 | fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 259 | BUG_ON(!atomic_read(&lower_dentry->d_count)); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 260 | ecryptfs_set_dentry_private(ecryptfs_dentry, |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 261 | kmem_cache_alloc(ecryptfs_dentry_info_cache, |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 262 | GFP_KERNEL)); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 263 | if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 264 | rc = -ENOMEM; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 265 | printk(KERN_ERR "%s: Out of memory whilst attempting " |
| 266 | "to allocate ecryptfs_dentry_info struct\n", |
| 267 | __func__); |
Lino Sanfilippo | 31f73be | 2010-07-29 13:01:36 +0200 | [diff] [blame] | 268 | goto out_put; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 269 | } |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 270 | ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry); |
| 271 | ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 272 | if (!lower_dentry->d_inode) { |
| 273 | /* We want to add because we couldn't find in lower */ |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 274 | d_add(ecryptfs_dentry, NULL); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 275 | goto out; |
| 276 | } |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 277 | rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, |
Erez Zadok | 3469b57 | 2009-12-06 18:51:15 -0500 | [diff] [blame] | 278 | ecryptfs_dir_inode->i_sb, |
| 279 | ECRYPTFS_INTERPOSE_FLAG_D_ADD); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 280 | if (rc) { |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 281 | printk(KERN_ERR "%s: Error interposing; rc = [%d]\n", |
| 282 | __func__, rc); |
Michael Halcrow | 391b52f | 2008-07-23 21:30:08 -0700 | [diff] [blame] | 283 | goto out; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 284 | } |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 285 | if (S_ISDIR(lower_inode->i_mode)) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 286 | goto out; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 287 | if (S_ISLNK(lower_inode->i_mode)) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 288 | goto out; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 289 | if (special_file(lower_inode->i_mode)) |
Ryusuke Konishi | 202a21d | 2007-08-10 13:00:51 -0700 | [diff] [blame] | 290 | goto out; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 291 | if (!ecryptfs_nd) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 292 | goto out; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 293 | /* Released in this function */ |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 294 | page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 295 | if (!page_virt) { |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 296 | printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n", |
| 297 | __func__); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 298 | rc = -ENOMEM; |
Michael Halcrow | 391b52f | 2008-07-23 21:30:08 -0700 | [diff] [blame] | 299 | goto out; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 300 | } |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 301 | if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) { |
| 302 | rc = ecryptfs_init_persistent_file(ecryptfs_dentry); |
Michael Halcrow | 391b52f | 2008-07-23 21:30:08 -0700 | [diff] [blame] | 303 | if (rc) { |
| 304 | printk(KERN_ERR "%s: Error attempting to initialize " |
| 305 | "the persistent file for the dentry with name " |
| 306 | "[%s]; rc = [%d]\n", __func__, |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 307 | ecryptfs_dentry->d_name.name, rc); |
| 308 | goto out_free_kmem; |
Michael Halcrow | 391b52f | 2008-07-23 21:30:08 -0700 | [diff] [blame] | 309 | } |
| 310 | } |
Tyler Hicks | 2aac0cf | 2009-03-20 02:23:57 -0500 | [diff] [blame] | 311 | crypt_stat = &ecryptfs_inode_to_private( |
| 312 | ecryptfs_dentry->d_inode)->crypt_stat; |
| 313 | /* TODO: lock for crypt_stat comparison */ |
| 314 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) |
| 315 | ecryptfs_set_default_sizes(crypt_stat); |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 316 | rc = ecryptfs_read_and_validate_header_region(page_virt, |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 317 | ecryptfs_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 318 | if (rc) { |
Tyler Hicks | 1984c23 | 2010-02-10 23:17:44 -0600 | [diff] [blame] | 319 | memset(page_virt, 0, PAGE_CACHE_SIZE); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 320 | rc = ecryptfs_read_and_validate_xattr_region(page_virt, |
| 321 | ecryptfs_dentry); |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 322 | if (rc) { |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 323 | rc = 0; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 324 | goto out_free_kmem; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 325 | } |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 326 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 327 | } |
Michael Halcrow | e77a56d | 2007-02-12 00:53:47 -0800 | [diff] [blame] | 328 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 329 | ecryptfs_dentry->d_sb)->mount_crypt_stat; |
Michael Halcrow | e77a56d | 2007-02-12 00:53:47 -0800 | [diff] [blame] | 330 | if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { |
| 331 | if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) |
Tyler Hicks | fa3ef1c | 2010-02-11 05:09:14 -0600 | [diff] [blame] | 332 | file_size = (crypt_stat->metadata_size |
Michael Halcrow | e77a56d | 2007-02-12 00:53:47 -0800 | [diff] [blame] | 333 | + i_size_read(lower_dentry->d_inode)); |
| 334 | else |
| 335 | file_size = i_size_read(lower_dentry->d_inode); |
| 336 | } else { |
Harvey Harrison | 0a688ad | 2008-07-23 21:30:07 -0700 | [diff] [blame] | 337 | file_size = get_unaligned_be64(page_virt); |
Michael Halcrow | e77a56d | 2007-02-12 00:53:47 -0800 | [diff] [blame] | 338 | } |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 339 | i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size); |
| 340 | out_free_kmem: |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 341 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); |
| 342 | goto out; |
Lino Sanfilippo | 31f73be | 2010-07-29 13:01:36 +0200 | [diff] [blame] | 343 | out_put: |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 344 | dput(lower_dentry); |
Lino Sanfilippo | 31f73be | 2010-07-29 13:01:36 +0200 | [diff] [blame] | 345 | mntput(lower_mnt); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 346 | d_drop(ecryptfs_dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 347 | out: |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 348 | return rc; |
| 349 | } |
| 350 | |
| 351 | /** |
Lino Sanfilippo | 21edad3 | 2010-07-15 15:11:55 +0200 | [diff] [blame] | 352 | * ecryptfs_new_lower_dentry |
Tyler Hicks | 93c3fe4 | 2010-08-25 10:26:37 -0500 | [diff] [blame] | 353 | * @name: The name of the new dentry. |
Lino Sanfilippo | 21edad3 | 2010-07-15 15:11:55 +0200 | [diff] [blame] | 354 | * @lower_dir_dentry: Parent directory of the new dentry. |
| 355 | * @nd: nameidata from last lookup. |
| 356 | * |
| 357 | * Create a new dentry or get it from lower parent dir. |
| 358 | */ |
| 359 | static struct dentry * |
| 360 | ecryptfs_new_lower_dentry(struct qstr *name, struct dentry *lower_dir_dentry, |
| 361 | struct nameidata *nd) |
| 362 | { |
| 363 | struct dentry *new_dentry; |
| 364 | struct dentry *tmp; |
| 365 | struct inode *lower_dir_inode; |
| 366 | |
| 367 | lower_dir_inode = lower_dir_dentry->d_inode; |
| 368 | |
| 369 | tmp = d_alloc(lower_dir_dentry, name); |
| 370 | if (!tmp) |
| 371 | return ERR_PTR(-ENOMEM); |
| 372 | |
| 373 | mutex_lock(&lower_dir_inode->i_mutex); |
| 374 | new_dentry = lower_dir_inode->i_op->lookup(lower_dir_inode, tmp, nd); |
| 375 | mutex_unlock(&lower_dir_inode->i_mutex); |
| 376 | |
| 377 | if (!new_dentry) |
| 378 | new_dentry = tmp; |
| 379 | else |
| 380 | dput(tmp); |
| 381 | |
| 382 | return new_dentry; |
| 383 | } |
| 384 | |
| 385 | |
| 386 | /** |
| 387 | * ecryptfs_lookup_one_lower |
| 388 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up |
| 389 | * @lower_dir_dentry: lower parent directory |
Tyler Hicks | 93c3fe4 | 2010-08-25 10:26:37 -0500 | [diff] [blame] | 390 | * @name: lower file name |
Lino Sanfilippo | 21edad3 | 2010-07-15 15:11:55 +0200 | [diff] [blame] | 391 | * |
| 392 | * Get the lower dentry from vfs. If lower dentry does not exist yet, |
| 393 | * create it. |
| 394 | */ |
| 395 | static struct dentry * |
| 396 | ecryptfs_lookup_one_lower(struct dentry *ecryptfs_dentry, |
Tyler Hicks | 93c3fe4 | 2010-08-25 10:26:37 -0500 | [diff] [blame] | 397 | struct dentry *lower_dir_dentry, struct qstr *name) |
Lino Sanfilippo | 21edad3 | 2010-07-15 15:11:55 +0200 | [diff] [blame] | 398 | { |
| 399 | struct nameidata nd; |
| 400 | struct vfsmount *lower_mnt; |
Lino Sanfilippo | 21edad3 | 2010-07-15 15:11:55 +0200 | [diff] [blame] | 401 | int err; |
| 402 | |
Lino Sanfilippo | 21edad3 | 2010-07-15 15:11:55 +0200 | [diff] [blame] | 403 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( |
| 404 | ecryptfs_dentry->d_parent)); |
| 405 | err = vfs_path_lookup(lower_dir_dentry, lower_mnt, name->name , 0, &nd); |
| 406 | mntput(lower_mnt); |
| 407 | |
| 408 | if (!err) { |
| 409 | /* we dont need the mount */ |
| 410 | mntput(nd.path.mnt); |
| 411 | return nd.path.dentry; |
| 412 | } |
| 413 | if (err != -ENOENT) |
| 414 | return ERR_PTR(err); |
| 415 | |
| 416 | /* create a new lower dentry */ |
| 417 | return ecryptfs_new_lower_dentry(name, lower_dir_dentry, &nd); |
| 418 | } |
| 419 | |
| 420 | /** |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 421 | * ecryptfs_lookup |
| 422 | * @ecryptfs_dir_inode: The eCryptfs directory inode |
| 423 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up |
| 424 | * @ecryptfs_nd: nameidata; may be NULL |
| 425 | * |
| 426 | * Find a file on disk. If the file does not exist, then we'll add it to the |
| 427 | * dentry cache and continue on to read it from the disk. |
| 428 | */ |
| 429 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, |
| 430 | struct dentry *ecryptfs_dentry, |
| 431 | struct nameidata *ecryptfs_nd) |
| 432 | { |
| 433 | char *encrypted_and_encoded_name = NULL; |
Michael Halcrow | a8f1286 | 2009-01-06 14:42:03 -0800 | [diff] [blame] | 434 | size_t encrypted_and_encoded_name_size; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 435 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 436 | struct dentry *lower_dir_dentry, *lower_dentry; |
Tyler Hicks | 93c3fe4 | 2010-08-25 10:26:37 -0500 | [diff] [blame] | 437 | struct qstr lower_name; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 438 | int rc = 0; |
| 439 | |
| 440 | ecryptfs_dentry->d_op = &ecryptfs_dops; |
| 441 | if ((ecryptfs_dentry->d_name.len == 1 |
| 442 | && !strcmp(ecryptfs_dentry->d_name.name, ".")) |
| 443 | || (ecryptfs_dentry->d_name.len == 2 |
| 444 | && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { |
| 445 | goto out_d_drop; |
| 446 | } |
| 447 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); |
Tyler Hicks | 93c3fe4 | 2010-08-25 10:26:37 -0500 | [diff] [blame] | 448 | lower_name.name = ecryptfs_dentry->d_name.name; |
| 449 | lower_name.len = ecryptfs_dentry->d_name.len; |
| 450 | lower_name.hash = ecryptfs_dentry->d_name.hash; |
| 451 | if (lower_dir_dentry->d_op && lower_dir_dentry->d_op->d_hash) { |
| 452 | rc = lower_dir_dentry->d_op->d_hash(lower_dir_dentry, |
| 453 | &lower_name); |
| 454 | if (rc < 0) |
| 455 | goto out_d_drop; |
| 456 | } |
Lino Sanfilippo | 21edad3 | 2010-07-15 15:11:55 +0200 | [diff] [blame] | 457 | lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry, |
Tyler Hicks | 93c3fe4 | 2010-08-25 10:26:37 -0500 | [diff] [blame] | 458 | lower_dir_dentry, &lower_name); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 459 | if (IS_ERR(lower_dentry)) { |
| 460 | rc = PTR_ERR(lower_dentry); |
Lino Sanfilippo | 21edad3 | 2010-07-15 15:11:55 +0200 | [diff] [blame] | 461 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned " |
Tyler Hicks | 9f37622 | 2010-03-25 11:16:56 -0500 | [diff] [blame] | 462 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
| 463 | encrypted_and_encoded_name); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 464 | goto out_d_drop; |
| 465 | } |
| 466 | if (lower_dentry->d_inode) |
| 467 | goto lookup_and_interpose; |
Tyler Hicks | 2aac0cf | 2009-03-20 02:23:57 -0500 | [diff] [blame] | 468 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
| 469 | ecryptfs_dentry->d_sb)->mount_crypt_stat; |
| 470 | if (!(mount_crypt_stat |
| 471 | && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 472 | goto lookup_and_interpose; |
| 473 | dput(lower_dentry); |
| 474 | rc = ecryptfs_encrypt_and_encode_filename( |
| 475 | &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, |
Tyler Hicks | 2aac0cf | 2009-03-20 02:23:57 -0500 | [diff] [blame] | 476 | NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 477 | ecryptfs_dentry->d_name.len); |
| 478 | if (rc) { |
| 479 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " |
| 480 | "filename; rc = [%d]\n", __func__, rc); |
| 481 | goto out_d_drop; |
| 482 | } |
Tyler Hicks | 93c3fe4 | 2010-08-25 10:26:37 -0500 | [diff] [blame] | 483 | lower_name.name = encrypted_and_encoded_name; |
| 484 | lower_name.len = encrypted_and_encoded_name_size; |
| 485 | lower_name.hash = full_name_hash(lower_name.name, lower_name.len); |
| 486 | if (lower_dir_dentry->d_op && lower_dir_dentry->d_op->d_hash) { |
| 487 | rc = lower_dir_dentry->d_op->d_hash(lower_dir_dentry, |
| 488 | &lower_name); |
| 489 | if (rc < 0) |
| 490 | goto out_d_drop; |
| 491 | } |
Lino Sanfilippo | 21edad3 | 2010-07-15 15:11:55 +0200 | [diff] [blame] | 492 | lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry, |
Tyler Hicks | 93c3fe4 | 2010-08-25 10:26:37 -0500 | [diff] [blame] | 493 | lower_dir_dentry, &lower_name); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 494 | if (IS_ERR(lower_dentry)) { |
| 495 | rc = PTR_ERR(lower_dentry); |
Lino Sanfilippo | 21edad3 | 2010-07-15 15:11:55 +0200 | [diff] [blame] | 496 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned " |
Tyler Hicks | 9f37622 | 2010-03-25 11:16:56 -0500 | [diff] [blame] | 497 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
| 498 | encrypted_and_encoded_name); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 499 | goto out_d_drop; |
| 500 | } |
| 501 | lookup_and_interpose: |
| 502 | rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry, |
Tyler Hicks | 2aac0cf | 2009-03-20 02:23:57 -0500 | [diff] [blame] | 503 | ecryptfs_dir_inode, |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 504 | ecryptfs_nd); |
| 505 | goto out; |
| 506 | out_d_drop: |
| 507 | d_drop(ecryptfs_dentry); |
| 508 | out: |
| 509 | kfree(encrypted_and_encoded_name); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 510 | return ERR_PTR(rc); |
| 511 | } |
| 512 | |
| 513 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, |
| 514 | struct dentry *new_dentry) |
| 515 | { |
| 516 | struct dentry *lower_old_dentry; |
| 517 | struct dentry *lower_new_dentry; |
| 518 | struct dentry *lower_dir_dentry; |
| 519 | u64 file_size_save; |
| 520 | int rc; |
| 521 | |
| 522 | file_size_save = i_size_read(old_dentry->d_inode); |
| 523 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
| 524 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); |
| 525 | dget(lower_old_dentry); |
| 526 | dget(lower_new_dentry); |
| 527 | lower_dir_dentry = lock_parent(lower_new_dentry); |
| 528 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, |
| 529 | lower_new_dentry); |
| 530 | if (rc || !lower_new_dentry->d_inode) |
| 531 | goto out_lock; |
| 532 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); |
| 533 | if (rc) |
| 534 | goto out_lock; |
Tyler Hicks | 3a8380c | 2010-03-23 18:09:02 -0500 | [diff] [blame] | 535 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
| 536 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 537 | old_dentry->d_inode->i_nlink = |
| 538 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; |
| 539 | i_size_write(new_dentry->d_inode, file_size_save); |
| 540 | out_lock: |
| 541 | unlock_dir(lower_dir_dentry); |
| 542 | dput(lower_new_dentry); |
| 543 | dput(lower_old_dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 544 | return rc; |
| 545 | } |
| 546 | |
| 547 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) |
| 548 | { |
| 549 | int rc = 0; |
| 550 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 551 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); |
Miklos Szeredi | 8dc4e37 | 2008-05-12 14:02:04 -0700 | [diff] [blame] | 552 | struct dentry *lower_dir_dentry; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 553 | |
Tyler Hicks | 9c2d205 | 2009-09-22 12:52:17 -0500 | [diff] [blame] | 554 | dget(lower_dentry); |
Miklos Szeredi | 8dc4e37 | 2008-05-12 14:02:04 -0700 | [diff] [blame] | 555 | lower_dir_dentry = lock_parent(lower_dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 556 | rc = vfs_unlink(lower_dir_inode, lower_dentry); |
| 557 | if (rc) { |
Michael Halcrow | ae56fb1 | 2006-11-16 01:19:30 -0800 | [diff] [blame] | 558 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 559 | goto out_unlock; |
| 560 | } |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 561 | fsstack_copy_attr_times(dir, lower_dir_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 562 | dentry->d_inode->i_nlink = |
| 563 | ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; |
| 564 | dentry->d_inode->i_ctime = dir->i_ctime; |
Michael Halcrow | caeeeec | 2008-01-08 15:33:02 -0800 | [diff] [blame] | 565 | d_drop(dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 566 | out_unlock: |
Miklos Szeredi | 8dc4e37 | 2008-05-12 14:02:04 -0700 | [diff] [blame] | 567 | unlock_dir(lower_dir_dentry); |
Tyler Hicks | 9c2d205 | 2009-09-22 12:52:17 -0500 | [diff] [blame] | 568 | dput(lower_dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 569 | return rc; |
| 570 | } |
| 571 | |
| 572 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, |
| 573 | const char *symname) |
| 574 | { |
| 575 | int rc; |
| 576 | struct dentry *lower_dentry; |
| 577 | struct dentry *lower_dir_dentry; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 578 | char *encoded_symname; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 579 | size_t encoded_symlen; |
| 580 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 581 | |
| 582 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 583 | dget(lower_dentry); |
| 584 | lower_dir_dentry = lock_parent(lower_dentry); |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 585 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
| 586 | dir->i_sb)->mount_crypt_stat; |
| 587 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, |
| 588 | &encoded_symlen, |
| 589 | NULL, |
| 590 | mount_crypt_stat, symname, |
| 591 | strlen(symname)); |
| 592 | if (rc) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 593 | goto out_lock; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 594 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, |
Miklos Szeredi | db2e747 | 2008-06-24 16:50:16 +0200 | [diff] [blame] | 595 | encoded_symname); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 596 | kfree(encoded_symname); |
| 597 | if (rc || !lower_dentry->d_inode) |
| 598 | goto out_lock; |
| 599 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); |
| 600 | if (rc) |
| 601 | goto out_lock; |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 602 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
| 603 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 604 | out_lock: |
| 605 | unlock_dir(lower_dir_dentry); |
| 606 | dput(lower_dentry); |
| 607 | if (!dentry->d_inode) |
| 608 | d_drop(dentry); |
| 609 | return rc; |
| 610 | } |
| 611 | |
| 612 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| 613 | { |
| 614 | int rc; |
| 615 | struct dentry *lower_dentry; |
| 616 | struct dentry *lower_dir_dentry; |
| 617 | |
| 618 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 619 | lower_dir_dentry = lock_parent(lower_dentry); |
| 620 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); |
| 621 | if (rc || !lower_dentry->d_inode) |
| 622 | goto out; |
| 623 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); |
| 624 | if (rc) |
| 625 | goto out; |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 626 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
| 627 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 628 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
| 629 | out: |
| 630 | unlock_dir(lower_dir_dentry); |
| 631 | if (!dentry->d_inode) |
| 632 | d_drop(dentry); |
| 633 | return rc; |
| 634 | } |
| 635 | |
| 636 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) |
| 637 | { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 638 | struct dentry *lower_dentry; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 639 | struct dentry *lower_dir_dentry; |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 640 | int rc; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 641 | |
| 642 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 643 | dget(dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 644 | lower_dir_dentry = lock_parent(lower_dentry); |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 645 | dget(lower_dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 646 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 647 | dput(lower_dentry); |
| 648 | if (!rc) |
| 649 | d_delete(lower_dentry); |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 650 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 651 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
| 652 | unlock_dir(lower_dir_dentry); |
| 653 | if (!rc) |
| 654 | d_drop(dentry); |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 655 | dput(dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 656 | return rc; |
| 657 | } |
| 658 | |
| 659 | static int |
| 660 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) |
| 661 | { |
| 662 | int rc; |
| 663 | struct dentry *lower_dentry; |
| 664 | struct dentry *lower_dir_dentry; |
| 665 | |
| 666 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 667 | lower_dir_dentry = lock_parent(lower_dentry); |
| 668 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); |
| 669 | if (rc || !lower_dentry->d_inode) |
| 670 | goto out; |
Michael Halcrow | 391b52f | 2008-07-23 21:30:08 -0700 | [diff] [blame] | 671 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 672 | if (rc) |
| 673 | goto out; |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 674 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
| 675 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 676 | out: |
| 677 | unlock_dir(lower_dir_dentry); |
| 678 | if (!dentry->d_inode) |
| 679 | d_drop(dentry); |
| 680 | return rc; |
| 681 | } |
| 682 | |
| 683 | static int |
| 684 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 685 | struct inode *new_dir, struct dentry *new_dentry) |
| 686 | { |
| 687 | int rc; |
| 688 | struct dentry *lower_old_dentry; |
| 689 | struct dentry *lower_new_dentry; |
| 690 | struct dentry *lower_old_dir_dentry; |
| 691 | struct dentry *lower_new_dir_dentry; |
Erez Zadok | 0d132f7 | 2009-12-05 21:17:09 -0500 | [diff] [blame] | 692 | struct dentry *trap = NULL; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 693 | |
| 694 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
| 695 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); |
| 696 | dget(lower_old_dentry); |
| 697 | dget(lower_new_dentry); |
| 698 | lower_old_dir_dentry = dget_parent(lower_old_dentry); |
| 699 | lower_new_dir_dentry = dget_parent(lower_new_dentry); |
Erez Zadok | 0d132f7 | 2009-12-05 21:17:09 -0500 | [diff] [blame] | 700 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
| 701 | /* source should not be ancestor of target */ |
| 702 | if (trap == lower_old_dentry) { |
| 703 | rc = -EINVAL; |
| 704 | goto out_lock; |
| 705 | } |
| 706 | /* target should not be ancestor of source */ |
| 707 | if (trap == lower_new_dentry) { |
| 708 | rc = -ENOTEMPTY; |
| 709 | goto out_lock; |
| 710 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 711 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, |
| 712 | lower_new_dir_dentry->d_inode, lower_new_dentry); |
| 713 | if (rc) |
| 714 | goto out_lock; |
Erez Zadok | 9afa2fb | 2009-12-02 19:51:54 -0500 | [diff] [blame] | 715 | fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 716 | if (new_dir != old_dir) |
Erez Zadok | 9afa2fb | 2009-12-02 19:51:54 -0500 | [diff] [blame] | 717 | fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 718 | out_lock: |
| 719 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
Michael Halcrow | a908308 | 2006-11-16 01:19:16 -0800 | [diff] [blame] | 720 | dput(lower_new_dentry->d_parent); |
| 721 | dput(lower_old_dentry->d_parent); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 722 | dput(lower_new_dentry); |
| 723 | dput(lower_old_dentry); |
| 724 | return rc; |
| 725 | } |
| 726 | |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 727 | static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, |
| 728 | size_t *bufsiz) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 729 | { |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 730 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 731 | char *lower_buf; |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 732 | size_t lower_bufsiz = PATH_MAX; |
Michael Halcrow | addd65ad | 2009-01-06 14:42:00 -0800 | [diff] [blame] | 733 | mm_segment_t old_fs; |
| 734 | int rc; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 735 | |
Tyler Hicks | 3a6b42c | 2009-04-16 18:35:37 -0500 | [diff] [blame] | 736 | lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 737 | if (!lower_buf) { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 738 | rc = -ENOMEM; |
| 739 | goto out; |
| 740 | } |
| 741 | old_fs = get_fs(); |
| 742 | set_fs(get_ds()); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 743 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, |
| 744 | (char __user *)lower_buf, |
Tyler Hicks | 3a6b42c | 2009-04-16 18:35:37 -0500 | [diff] [blame] | 745 | lower_bufsiz); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 746 | set_fs(old_fs); |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 747 | if (rc < 0) |
| 748 | goto out; |
| 749 | lower_bufsiz = rc; |
| 750 | rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, |
| 751 | lower_buf, lower_bufsiz); |
| 752 | out: |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 753 | kfree(lower_buf); |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 754 | return rc; |
| 755 | } |
| 756 | |
| 757 | static int |
| 758 | ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) |
| 759 | { |
| 760 | char *kbuf; |
| 761 | size_t kbufsiz, copied; |
| 762 | int rc; |
| 763 | |
| 764 | rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); |
| 765 | if (rc) |
| 766 | goto out; |
| 767 | copied = min_t(size_t, bufsiz, kbufsiz); |
| 768 | rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; |
| 769 | kfree(kbuf); |
| 770 | fsstack_copy_attr_atime(dentry->d_inode, |
| 771 | ecryptfs_dentry_to_lower(dentry)->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 772 | out: |
| 773 | return rc; |
| 774 | } |
| 775 | |
| 776 | static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) |
| 777 | { |
| 778 | char *buf; |
| 779 | int len = PAGE_SIZE, rc; |
| 780 | mm_segment_t old_fs; |
| 781 | |
| 782 | /* Released in ecryptfs_put_link(); only release here on error */ |
| 783 | buf = kmalloc(len, GFP_KERNEL); |
| 784 | if (!buf) { |
OGAWA Hirofumi | 806892e | 2010-01-12 03:36:14 +0900 | [diff] [blame] | 785 | buf = ERR_PTR(-ENOMEM); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 786 | goto out; |
| 787 | } |
| 788 | old_fs = get_fs(); |
| 789 | set_fs(get_ds()); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 790 | rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 791 | set_fs(old_fs); |
OGAWA Hirofumi | 806892e | 2010-01-12 03:36:14 +0900 | [diff] [blame] | 792 | if (rc < 0) { |
| 793 | kfree(buf); |
| 794 | buf = ERR_PTR(rc); |
| 795 | } else |
Duane Griffin | a17d523 | 2008-12-19 20:47:10 +0000 | [diff] [blame] | 796 | buf[rc] = '\0'; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 797 | out: |
OGAWA Hirofumi | 806892e | 2010-01-12 03:36:14 +0900 | [diff] [blame] | 798 | nd_set_link(nd, buf); |
| 799 | return NULL; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 800 | } |
| 801 | |
| 802 | static void |
| 803 | ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) |
| 804 | { |
OGAWA Hirofumi | 806892e | 2010-01-12 03:36:14 +0900 | [diff] [blame] | 805 | char *buf = nd_get_link(nd); |
| 806 | if (!IS_ERR(buf)) { |
| 807 | /* Free the char* */ |
| 808 | kfree(buf); |
| 809 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 810 | } |
| 811 | |
| 812 | /** |
| 813 | * upper_size_to_lower_size |
| 814 | * @crypt_stat: Crypt_stat associated with file |
| 815 | * @upper_size: Size of the upper file |
| 816 | * |
Michael Halcrow | cc11bef | 2008-02-06 01:38:32 -0800 | [diff] [blame] | 817 | * Calculate the required size of the lower file based on the |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 818 | * specified size of the upper file. This calculation is based on the |
| 819 | * number of headers in the underlying file and the extent size. |
| 820 | * |
| 821 | * Returns Calculated size of the lower file. |
| 822 | */ |
| 823 | static loff_t |
| 824 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, |
| 825 | loff_t upper_size) |
| 826 | { |
| 827 | loff_t lower_size; |
| 828 | |
Tyler Hicks | 157f107 | 2010-02-11 07:10:38 -0600 | [diff] [blame] | 829 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 830 | if (upper_size != 0) { |
| 831 | loff_t num_extents; |
| 832 | |
| 833 | num_extents = upper_size >> crypt_stat->extent_shift; |
| 834 | if (upper_size & ~crypt_stat->extent_mask) |
| 835 | num_extents++; |
| 836 | lower_size += (num_extents * crypt_stat->extent_size); |
| 837 | } |
| 838 | return lower_size; |
| 839 | } |
| 840 | |
| 841 | /** |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 842 | * truncate_upper |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 843 | * @dentry: The ecryptfs layer dentry |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 844 | * @ia: Address of the ecryptfs inode's attributes |
| 845 | * @lower_ia: Address of the lower inode's attributes |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 846 | * |
| 847 | * Function to handle truncations modifying the size of the file. Note |
| 848 | * that the file sizes are interpolated. When expanding, we are simply |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 849 | * writing strings of 0's out. When truncating, we truncate the upper |
| 850 | * inode and update the lower_ia according to the page index |
| 851 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, |
| 852 | * the caller must use lower_ia in a call to notify_change() to perform |
| 853 | * the truncation of the lower inode. |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 854 | * |
| 855 | * Returns zero on success; non-zero otherwise |
| 856 | */ |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 857 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
| 858 | struct iattr *lower_ia) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 859 | { |
| 860 | int rc = 0; |
| 861 | struct inode *inode = dentry->d_inode; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 862 | struct ecryptfs_crypt_stat *crypt_stat; |
| 863 | loff_t i_size = i_size_read(inode); |
| 864 | loff_t lower_size_before_truncate; |
| 865 | loff_t lower_size_after_truncate; |
| 866 | |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 867 | if (unlikely((ia->ia_size == i_size))) { |
| 868 | lower_ia->ia_valid &= ~ATTR_SIZE; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 869 | goto out; |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 870 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 871 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 872 | /* Switch on growing or shrinking file */ |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 873 | if (ia->ia_size > i_size) { |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 874 | char zero[] = { 0x00 }; |
Michael Halcrow | 240e2df | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 875 | |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 876 | lower_ia->ia_valid &= ~ATTR_SIZE; |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 877 | /* Write a single 0 at the last position of the file; |
| 878 | * this triggers code that will fill in 0's throughout |
| 879 | * the intermediate portion of the previous end of the |
| 880 | * file and the new and of the file */ |
Al Viro | 48c1e44 | 2010-05-21 11:09:58 -0400 | [diff] [blame] | 881 | rc = ecryptfs_write(inode, zero, |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 882 | (ia->ia_size - 1), 1); |
| 883 | } else { /* ia->ia_size < i_size_read(inode) */ |
| 884 | /* We're chopping off all the pages down to the page |
| 885 | * in which ia->ia_size is located. Fill in the end of |
| 886 | * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 887 | * PAGE_CACHE_SIZE with zeros. */ |
| 888 | size_t num_zeros = (PAGE_CACHE_SIZE |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 889 | - (ia->ia_size & ~PAGE_CACHE_MASK)); |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 890 | |
Christoph Hellwig | 2c27c65 | 2010-06-04 11:30:04 +0200 | [diff] [blame] | 891 | |
| 892 | /* |
| 893 | * XXX(truncate) this should really happen at the begginning |
| 894 | * of ->setattr. But the code is too messy to that as part |
| 895 | * of a larger patch. ecryptfs is also totally missing out |
| 896 | * on the inode_change_ok check at the beginning of |
| 897 | * ->setattr while would include this. |
| 898 | */ |
| 899 | rc = inode_newsize_ok(inode, ia->ia_size); |
| 900 | if (rc) |
| 901 | goto out; |
| 902 | |
Tyler Hicks | 13a791b | 2009-04-13 15:29:27 -0500 | [diff] [blame] | 903 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
Christoph Hellwig | 2c27c65 | 2010-06-04 11:30:04 +0200 | [diff] [blame] | 904 | truncate_setsize(inode, ia->ia_size); |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 905 | lower_ia->ia_size = ia->ia_size; |
| 906 | lower_ia->ia_valid |= ATTR_SIZE; |
Al Viro | 48c1e44 | 2010-05-21 11:09:58 -0400 | [diff] [blame] | 907 | goto out; |
Tyler Hicks | 13a791b | 2009-04-13 15:29:27 -0500 | [diff] [blame] | 908 | } |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 909 | if (num_zeros) { |
| 910 | char *zeros_virt; |
| 911 | |
| 912 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); |
| 913 | if (!zeros_virt) { |
| 914 | rc = -ENOMEM; |
Al Viro | 48c1e44 | 2010-05-21 11:09:58 -0400 | [diff] [blame] | 915 | goto out; |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 916 | } |
Al Viro | 48c1e44 | 2010-05-21 11:09:58 -0400 | [diff] [blame] | 917 | rc = ecryptfs_write(inode, zeros_virt, |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 918 | ia->ia_size, num_zeros); |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 919 | kfree(zeros_virt); |
Michael Halcrow | 5dda699 | 2007-10-16 01:28:06 -0700 | [diff] [blame] | 920 | if (rc) { |
Michael Halcrow | 240e2df | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 921 | printk(KERN_ERR "Error attempting to zero out " |
| 922 | "the remainder of the end page on " |
| 923 | "reducing truncate; rc = [%d]\n", rc); |
Al Viro | 48c1e44 | 2010-05-21 11:09:58 -0400 | [diff] [blame] | 924 | goto out; |
Michael Halcrow | 240e2df | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 925 | } |
| 926 | } |
Christoph Hellwig | 2c27c65 | 2010-06-04 11:30:04 +0200 | [diff] [blame] | 927 | truncate_setsize(inode, ia->ia_size); |
Michael Halcrow | 0216f7f | 2007-10-16 01:28:08 -0700 | [diff] [blame] | 928 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 929 | if (rc) { |
| 930 | printk(KERN_ERR "Problem with " |
| 931 | "ecryptfs_write_inode_size_to_metadata; " |
| 932 | "rc = [%d]\n", rc); |
Al Viro | 48c1e44 | 2010-05-21 11:09:58 -0400 | [diff] [blame] | 933 | goto out; |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 934 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 935 | /* We are reducing the size of the ecryptfs file, and need to |
| 936 | * know if we need to reduce the size of the lower file. */ |
| 937 | lower_size_before_truncate = |
| 938 | upper_size_to_lower_size(crypt_stat, i_size); |
| 939 | lower_size_after_truncate = |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 940 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
| 941 | if (lower_size_after_truncate < lower_size_before_truncate) { |
| 942 | lower_ia->ia_size = lower_size_after_truncate; |
| 943 | lower_ia->ia_valid |= ATTR_SIZE; |
| 944 | } else |
| 945 | lower_ia->ia_valid &= ~ATTR_SIZE; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 946 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 947 | out: |
| 948 | return rc; |
| 949 | } |
| 950 | |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 951 | /** |
| 952 | * ecryptfs_truncate |
| 953 | * @dentry: The ecryptfs layer dentry |
| 954 | * @new_length: The length to expand the file to |
| 955 | * |
| 956 | * Simple function that handles the truncation of an eCryptfs inode and |
| 957 | * its corresponding lower inode. |
| 958 | * |
| 959 | * Returns zero on success; non-zero otherwise |
| 960 | */ |
| 961 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) |
| 962 | { |
| 963 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; |
| 964 | struct iattr lower_ia = { .ia_valid = 0 }; |
| 965 | int rc; |
| 966 | |
| 967 | rc = truncate_upper(dentry, &ia, &lower_ia); |
| 968 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { |
| 969 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 970 | |
| 971 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
| 972 | rc = notify_change(lower_dentry, &lower_ia); |
| 973 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
| 974 | } |
| 975 | return rc; |
| 976 | } |
| 977 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 978 | static int |
Al Viro | e6305c4 | 2008-07-15 21:03:57 -0400 | [diff] [blame] | 979 | ecryptfs_permission(struct inode *inode, int mask) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 980 | { |
Al Viro | f419a2e | 2008-07-22 00:07:17 -0400 | [diff] [blame] | 981 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 982 | } |
| 983 | |
| 984 | /** |
| 985 | * ecryptfs_setattr |
| 986 | * @dentry: dentry handle to the inode to modify |
| 987 | * @ia: Structure with flags of what to change and values |
| 988 | * |
| 989 | * Updates the metadata of an inode. If the update is to the size |
| 990 | * i.e. truncation, then ecryptfs_truncate will handle the size modification |
| 991 | * of both the ecryptfs inode and the lower inode. |
| 992 | * |
| 993 | * All other metadata changes will be passed right to the lower filesystem, |
| 994 | * and we will just update our inode to look like the lower. |
| 995 | */ |
| 996 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) |
| 997 | { |
| 998 | int rc = 0; |
| 999 | struct dentry *lower_dentry; |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 1000 | struct iattr lower_ia; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1001 | struct inode *inode; |
| 1002 | struct inode *lower_inode; |
| 1003 | struct ecryptfs_crypt_stat *crypt_stat; |
| 1004 | |
| 1005 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 1006 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
| 1007 | ecryptfs_init_crypt_stat(crypt_stat); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1008 | inode = dentry->d_inode; |
| 1009 | lower_inode = ecryptfs_inode_to_lower(inode); |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 1010 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 1011 | mutex_lock(&crypt_stat->cs_mutex); |
| 1012 | if (S_ISDIR(dentry->d_inode->i_mode)) |
| 1013 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
Michael Halcrow | 64ee480 | 2007-07-19 01:47:54 -0700 | [diff] [blame] | 1014 | else if (S_ISREG(dentry->d_inode->i_mode) |
| 1015 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) |
| 1016 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 1017 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 1018 | |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 1019 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
| 1020 | dentry->d_sb)->mount_crypt_stat; |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 1021 | rc = ecryptfs_read_metadata(dentry); |
Michael Halcrow | 5dda699 | 2007-10-16 01:28:06 -0700 | [diff] [blame] | 1022 | if (rc) { |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 1023 | if (!(mount_crypt_stat->flags |
| 1024 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { |
| 1025 | rc = -EIO; |
Michael Halcrow | 25bd817 | 2008-02-06 01:38:35 -0800 | [diff] [blame] | 1026 | printk(KERN_WARNING "Either the lower file " |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 1027 | "is not in a valid eCryptfs format, " |
Michael Halcrow | 25bd817 | 2008-02-06 01:38:35 -0800 | [diff] [blame] | 1028 | "or the key could not be retrieved. " |
| 1029 | "Plaintext passthrough mode is not " |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 1030 | "enabled; returning -EIO\n"); |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 1031 | mutex_unlock(&crypt_stat->cs_mutex); |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 1032 | goto out; |
| 1033 | } |
| 1034 | rc = 0; |
| 1035 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 1036 | } |
Michael Halcrow | e10f281 | 2007-06-27 14:09:44 -0700 | [diff] [blame] | 1037 | } |
| 1038 | mutex_unlock(&crypt_stat->cs_mutex); |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 1039 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
| 1040 | if (ia->ia_valid & ATTR_FILE) |
| 1041 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1042 | if (ia->ia_valid & ATTR_SIZE) { |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 1043 | rc = truncate_upper(dentry, ia, &lower_ia); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1044 | if (rc < 0) |
| 1045 | goto out; |
| 1046 | } |
Jeff Layton | 1ac564e | 2007-10-18 03:05:17 -0700 | [diff] [blame] | 1047 | |
| 1048 | /* |
| 1049 | * mode change is for clearing setuid/setgid bits. Allow lower fs |
| 1050 | * to interpret this in its own way. |
| 1051 | */ |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 1052 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
| 1053 | lower_ia.ia_valid &= ~ATTR_MODE; |
Jeff Layton | 1ac564e | 2007-10-18 03:05:17 -0700 | [diff] [blame] | 1054 | |
Miklos Szeredi | 9c3580a | 2008-04-29 00:59:48 -0700 | [diff] [blame] | 1055 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
Tyler Hicks | 5f3ef64 | 2009-10-14 16:18:27 -0500 | [diff] [blame] | 1056 | rc = notify_change(lower_dentry, &lower_ia); |
Miklos Szeredi | 9c3580a | 2008-04-29 00:59:48 -0700 | [diff] [blame] | 1057 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1058 | out: |
Erez Zadok | 9afa2fb | 2009-12-02 19:51:54 -0500 | [diff] [blame] | 1059 | fsstack_copy_attr_all(inode, lower_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1060 | return rc; |
| 1061 | } |
| 1062 | |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 1063 | int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, |
| 1064 | struct kstat *stat) |
| 1065 | { |
| 1066 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
| 1067 | int rc = 0; |
| 1068 | |
| 1069 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
| 1070 | dentry->d_sb)->mount_crypt_stat; |
| 1071 | generic_fillattr(dentry->d_inode, stat); |
| 1072 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { |
| 1073 | char *target; |
| 1074 | size_t targetsiz; |
| 1075 | |
| 1076 | rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); |
| 1077 | if (!rc) { |
| 1078 | kfree(target); |
| 1079 | stat->size = targetsiz; |
| 1080 | } |
| 1081 | } |
| 1082 | return rc; |
| 1083 | } |
| 1084 | |
Tyler Hicks | f8f484d | 2009-11-04 02:48:01 -0600 | [diff] [blame] | 1085 | int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| 1086 | struct kstat *stat) |
| 1087 | { |
| 1088 | struct kstat lower_stat; |
| 1089 | int rc; |
| 1090 | |
| 1091 | rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), |
| 1092 | ecryptfs_dentry_to_lower(dentry), &lower_stat); |
| 1093 | if (!rc) { |
| 1094 | generic_fillattr(dentry->d_inode, stat); |
| 1095 | stat->blocks = lower_stat.blocks; |
| 1096 | } |
| 1097 | return rc; |
| 1098 | } |
| 1099 | |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 1100 | int |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1101 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
| 1102 | size_t size, int flags) |
| 1103 | { |
| 1104 | int rc = 0; |
| 1105 | struct dentry *lower_dentry; |
| 1106 | |
| 1107 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 1108 | if (!lower_dentry->d_inode->i_op->setxattr) { |
Christian Pulvermacher | cfce08c | 2010-03-23 11:51:38 -0500 | [diff] [blame] | 1109 | rc = -EOPNOTSUPP; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1110 | goto out; |
| 1111 | } |
Roberto Sassu | 48b512e | 2010-10-05 18:53:45 +0200 | [diff] [blame^] | 1112 | |
| 1113 | rc = vfs_setxattr(lower_dentry, name, value, size, flags); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1114 | out: |
| 1115 | return rc; |
| 1116 | } |
| 1117 | |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 1118 | ssize_t |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 1119 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, |
| 1120 | void *value, size_t size) |
| 1121 | { |
| 1122 | int rc = 0; |
| 1123 | |
| 1124 | if (!lower_dentry->d_inode->i_op->getxattr) { |
Christian Pulvermacher | cfce08c | 2010-03-23 11:51:38 -0500 | [diff] [blame] | 1125 | rc = -EOPNOTSUPP; |
Michael Halcrow | d7cdc5f | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 1126 | goto out; |
| 1127 | } |
| 1128 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
| 1129 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, |
| 1130 | size); |
| 1131 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
| 1132 | out: |
| 1133 | return rc; |
| 1134 | } |
| 1135 | |
Adrian Bunk | 7896b63 | 2008-02-06 01:38:32 -0800 | [diff] [blame] | 1136 | static ssize_t |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1137 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
| 1138 | size_t size) |
| 1139 | { |
Michael Halcrow | 2ed9255 | 2007-10-16 01:28:10 -0700 | [diff] [blame] | 1140 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, |
| 1141 | value, size); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1142 | } |
| 1143 | |
| 1144 | static ssize_t |
| 1145 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) |
| 1146 | { |
| 1147 | int rc = 0; |
| 1148 | struct dentry *lower_dentry; |
| 1149 | |
| 1150 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 1151 | if (!lower_dentry->d_inode->i_op->listxattr) { |
Christian Pulvermacher | cfce08c | 2010-03-23 11:51:38 -0500 | [diff] [blame] | 1152 | rc = -EOPNOTSUPP; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1153 | goto out; |
| 1154 | } |
| 1155 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
| 1156 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); |
| 1157 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
| 1158 | out: |
| 1159 | return rc; |
| 1160 | } |
| 1161 | |
| 1162 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) |
| 1163 | { |
| 1164 | int rc = 0; |
| 1165 | struct dentry *lower_dentry; |
| 1166 | |
| 1167 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 1168 | if (!lower_dentry->d_inode->i_op->removexattr) { |
Christian Pulvermacher | cfce08c | 2010-03-23 11:51:38 -0500 | [diff] [blame] | 1169 | rc = -EOPNOTSUPP; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1170 | goto out; |
| 1171 | } |
| 1172 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
| 1173 | rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); |
| 1174 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
| 1175 | out: |
| 1176 | return rc; |
| 1177 | } |
| 1178 | |
| 1179 | int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) |
| 1180 | { |
| 1181 | if ((ecryptfs_inode_to_lower(inode) |
| 1182 | == (struct inode *)candidate_lower_inode)) |
| 1183 | return 1; |
| 1184 | else |
| 1185 | return 0; |
| 1186 | } |
| 1187 | |
| 1188 | int ecryptfs_inode_set(struct inode *inode, void *lower_inode) |
| 1189 | { |
| 1190 | ecryptfs_init_inode(inode, (struct inode *)lower_inode); |
| 1191 | return 0; |
| 1192 | } |
| 1193 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 1194 | const struct inode_operations ecryptfs_symlink_iops = { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1195 | .readlink = ecryptfs_readlink, |
| 1196 | .follow_link = ecryptfs_follow_link, |
| 1197 | .put_link = ecryptfs_put_link, |
| 1198 | .permission = ecryptfs_permission, |
| 1199 | .setattr = ecryptfs_setattr, |
Tyler Hicks | 3a60a16 | 2010-03-22 00:41:35 -0500 | [diff] [blame] | 1200 | .getattr = ecryptfs_getattr_link, |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1201 | .setxattr = ecryptfs_setxattr, |
| 1202 | .getxattr = ecryptfs_getxattr, |
| 1203 | .listxattr = ecryptfs_listxattr, |
| 1204 | .removexattr = ecryptfs_removexattr |
| 1205 | }; |
| 1206 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 1207 | const struct inode_operations ecryptfs_dir_iops = { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1208 | .create = ecryptfs_create, |
| 1209 | .lookup = ecryptfs_lookup, |
| 1210 | .link = ecryptfs_link, |
| 1211 | .unlink = ecryptfs_unlink, |
| 1212 | .symlink = ecryptfs_symlink, |
| 1213 | .mkdir = ecryptfs_mkdir, |
| 1214 | .rmdir = ecryptfs_rmdir, |
| 1215 | .mknod = ecryptfs_mknod, |
| 1216 | .rename = ecryptfs_rename, |
| 1217 | .permission = ecryptfs_permission, |
| 1218 | .setattr = ecryptfs_setattr, |
| 1219 | .setxattr = ecryptfs_setxattr, |
| 1220 | .getxattr = ecryptfs_getxattr, |
| 1221 | .listxattr = ecryptfs_listxattr, |
| 1222 | .removexattr = ecryptfs_removexattr |
| 1223 | }; |
| 1224 | |
Arjan van de Ven | 754661f | 2007-02-12 00:55:38 -0800 | [diff] [blame] | 1225 | const struct inode_operations ecryptfs_main_iops = { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1226 | .permission = ecryptfs_permission, |
| 1227 | .setattr = ecryptfs_setattr, |
Tyler Hicks | f8f484d | 2009-11-04 02:48:01 -0600 | [diff] [blame] | 1228 | .getattr = ecryptfs_getattr, |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1229 | .setxattr = ecryptfs_setxattr, |
| 1230 | .getxattr = ecryptfs_getxattr, |
| 1231 | .listxattr = ecryptfs_listxattr, |
| 1232 | .removexattr = ecryptfs_removexattr |
| 1233 | }; |