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> |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 34 | #include "ecryptfs_kernel.h" |
| 35 | |
| 36 | static struct dentry *lock_parent(struct dentry *dentry) |
| 37 | { |
| 38 | struct dentry *dir; |
| 39 | |
| 40 | dir = dget(dentry->d_parent); |
| 41 | mutex_lock(&(dir->d_inode->i_mutex)); |
| 42 | return dir; |
| 43 | } |
| 44 | |
| 45 | static void unlock_parent(struct dentry *dentry) |
| 46 | { |
| 47 | mutex_unlock(&(dentry->d_parent->d_inode->i_mutex)); |
| 48 | dput(dentry->d_parent); |
| 49 | } |
| 50 | |
| 51 | static void unlock_dir(struct dentry *dir) |
| 52 | { |
| 53 | mutex_unlock(&dir->d_inode->i_mutex); |
| 54 | dput(dir); |
| 55 | } |
| 56 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 57 | /** |
| 58 | * ecryptfs_create_underlying_file |
| 59 | * @lower_dir_inode: inode of the parent in the lower fs of the new file |
| 60 | * @lower_dentry: New file's dentry in the lower fs |
| 61 | * @ecryptfs_dentry: New file's dentry in ecryptfs |
| 62 | * @mode: The mode of the new file |
| 63 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount |
| 64 | * |
| 65 | * Creates the file in the lower file system. |
| 66 | * |
| 67 | * Returns zero on success; non-zero on error condition |
| 68 | */ |
| 69 | static int |
| 70 | ecryptfs_create_underlying_file(struct inode *lower_dir_inode, |
| 71 | struct dentry *dentry, int mode, |
| 72 | struct nameidata *nd) |
| 73 | { |
| 74 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 75 | struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); |
| 76 | struct dentry *dentry_save; |
| 77 | struct vfsmount *vfsmount_save; |
| 78 | int rc; |
| 79 | |
| 80 | dentry_save = nd->dentry; |
| 81 | vfsmount_save = nd->mnt; |
| 82 | nd->dentry = lower_dentry; |
| 83 | nd->mnt = lower_mnt; |
| 84 | rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); |
| 85 | nd->dentry = dentry_save; |
| 86 | nd->mnt = vfsmount_save; |
| 87 | return rc; |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * ecryptfs_do_create |
| 92 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs |
| 93 | * @ecryptfs_dentry: New file's dentry in ecryptfs |
| 94 | * @mode: The mode of the new file |
| 95 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount |
| 96 | * |
| 97 | * Creates the underlying file and the eCryptfs inode which will link to |
| 98 | * it. It will also update the eCryptfs directory inode to mimic the |
| 99 | * stat of the lower directory inode. |
| 100 | * |
| 101 | * Returns zero on success; non-zero on error condition |
| 102 | */ |
| 103 | static int |
| 104 | ecryptfs_do_create(struct inode *directory_inode, |
| 105 | struct dentry *ecryptfs_dentry, int mode, |
| 106 | struct nameidata *nd) |
| 107 | { |
| 108 | int rc; |
| 109 | struct dentry *lower_dentry; |
| 110 | struct dentry *lower_dir_dentry; |
| 111 | |
| 112 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); |
| 113 | lower_dir_dentry = lock_parent(lower_dentry); |
| 114 | if (unlikely(IS_ERR(lower_dir_dentry))) { |
| 115 | ecryptfs_printk(KERN_ERR, "Error locking directory of " |
| 116 | "dentry\n"); |
| 117 | rc = PTR_ERR(lower_dir_dentry); |
| 118 | goto out; |
| 119 | } |
| 120 | rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, |
| 121 | ecryptfs_dentry, mode, nd); |
| 122 | if (unlikely(rc)) { |
| 123 | ecryptfs_printk(KERN_ERR, |
| 124 | "Failure to create underlying file\n"); |
| 125 | goto out_lock; |
| 126 | } |
| 127 | rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, |
| 128 | directory_inode->i_sb, 0); |
| 129 | if (rc) { |
| 130 | ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); |
| 131 | goto out_lock; |
| 132 | } |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 133 | fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); |
| 134 | fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 135 | out_lock: |
| 136 | unlock_dir(lower_dir_dentry); |
| 137 | out: |
| 138 | return rc; |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * grow_file |
| 143 | * @ecryptfs_dentry: the ecryptfs dentry |
| 144 | * @lower_file: The lower file |
| 145 | * @inode: The ecryptfs inode |
| 146 | * @lower_inode: The lower inode |
| 147 | * |
| 148 | * This is the code which will grow the file to its correct size. |
| 149 | */ |
| 150 | static int grow_file(struct dentry *ecryptfs_dentry, struct file *lower_file, |
| 151 | struct inode *inode, struct inode *lower_inode) |
| 152 | { |
| 153 | int rc = 0; |
| 154 | struct file fake_file; |
| 155 | struct ecryptfs_file_info tmp_file_info; |
| 156 | |
| 157 | memset(&fake_file, 0, sizeof(fake_file)); |
Josef "Jeff" Sipek | bd243a4 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 158 | fake_file.f_path.dentry = ecryptfs_dentry; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 159 | memset(&tmp_file_info, 0, sizeof(tmp_file_info)); |
| 160 | ecryptfs_set_file_private(&fake_file, &tmp_file_info); |
| 161 | ecryptfs_set_file_lower(&fake_file, lower_file); |
| 162 | rc = ecryptfs_fill_zeros(&fake_file, 1); |
| 163 | if (rc) { |
| 164 | ECRYPTFS_SET_FLAG( |
| 165 | ecryptfs_inode_to_private(inode)->crypt_stat.flags, |
| 166 | ECRYPTFS_SECURITY_WARNING); |
| 167 | ecryptfs_printk(KERN_WARNING, "Error attempting to fill zeros " |
| 168 | "in file; rc = [%d]\n", rc); |
| 169 | goto out; |
| 170 | } |
| 171 | i_size_write(inode, 0); |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame^] | 172 | ecryptfs_write_inode_size_to_metadata(lower_file, lower_inode, inode, |
| 173 | ecryptfs_dentry, |
| 174 | ECRYPTFS_LOWER_I_MUTEX_NOT_HELD); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 175 | ECRYPTFS_SET_FLAG(ecryptfs_inode_to_private(inode)->crypt_stat.flags, |
| 176 | ECRYPTFS_NEW_FILE); |
| 177 | out: |
| 178 | return rc; |
| 179 | } |
| 180 | |
| 181 | /** |
| 182 | * ecryptfs_initialize_file |
| 183 | * |
| 184 | * Cause the file to be changed from a basic empty file to an ecryptfs |
| 185 | * file with a header and first data page. |
| 186 | * |
| 187 | * Returns zero on success |
| 188 | */ |
| 189 | static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) |
| 190 | { |
| 191 | int rc = 0; |
| 192 | int lower_flags; |
| 193 | struct ecryptfs_crypt_stat *crypt_stat; |
| 194 | struct dentry *lower_dentry; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 195 | struct file *lower_file; |
| 196 | struct inode *inode, *lower_inode; |
| 197 | struct vfsmount *lower_mnt; |
| 198 | |
| 199 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); |
| 200 | ecryptfs_printk(KERN_DEBUG, "lower_dentry->d_name.name = [%s]\n", |
| 201 | lower_dentry->d_name.name); |
| 202 | inode = ecryptfs_dentry->d_inode; |
| 203 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 204 | lower_flags = ((O_CREAT | O_WRONLY | O_TRUNC) & O_ACCMODE) | O_RDWR; |
| 205 | #if BITS_PER_LONG != 32 |
| 206 | lower_flags |= O_LARGEFILE; |
| 207 | #endif |
| 208 | lower_mnt = ecryptfs_dentry_to_lower_mnt(ecryptfs_dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 209 | /* Corresponding fput() at end of this function */ |
Michael Halcrow | 7ff1d74 | 2006-10-30 22:07:19 -0800 | [diff] [blame] | 210 | if ((rc = ecryptfs_open_lower_file(&lower_file, lower_dentry, lower_mnt, |
| 211 | lower_flags))) { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 212 | ecryptfs_printk(KERN_ERR, |
| 213 | "Error opening dentry; rc = [%i]\n", rc); |
| 214 | goto out; |
| 215 | } |
Michael Halcrow | 7ff1d74 | 2006-10-30 22:07:19 -0800 | [diff] [blame] | 216 | lower_inode = lower_dentry->d_inode; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 217 | if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { |
| 218 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); |
| 219 | ECRYPTFS_CLEAR_FLAG(crypt_stat->flags, ECRYPTFS_ENCRYPTED); |
| 220 | goto out_fput; |
| 221 | } |
| 222 | ECRYPTFS_SET_FLAG(crypt_stat->flags, ECRYPTFS_NEW_FILE); |
| 223 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
| 224 | rc = ecryptfs_new_file_context(ecryptfs_dentry); |
| 225 | if (rc) { |
| 226 | ecryptfs_printk(KERN_DEBUG, "Error creating new file " |
| 227 | "context\n"); |
| 228 | goto out_fput; |
| 229 | } |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame^] | 230 | rc = ecryptfs_write_metadata(ecryptfs_dentry, lower_file); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 231 | if (rc) { |
| 232 | ecryptfs_printk(KERN_DEBUG, "Error writing headers\n"); |
| 233 | goto out_fput; |
| 234 | } |
| 235 | rc = grow_file(ecryptfs_dentry, lower_file, inode, lower_inode); |
| 236 | out_fput: |
Michael Halcrow | 7ff1d74 | 2006-10-30 22:07:19 -0800 | [diff] [blame] | 237 | if ((rc = ecryptfs_close_lower_file(lower_file))) |
| 238 | printk(KERN_ERR "Error closing lower_file\n"); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 239 | out: |
| 240 | return rc; |
| 241 | } |
| 242 | |
| 243 | /** |
| 244 | * ecryptfs_create |
| 245 | * @dir: The inode of the directory in which to create the file. |
| 246 | * @dentry: The eCryptfs dentry |
| 247 | * @mode: The mode of the new file. |
| 248 | * @nd: nameidata |
| 249 | * |
| 250 | * Creates a new file. |
| 251 | * |
| 252 | * Returns zero on success; non-zero on error condition |
| 253 | */ |
| 254 | static int |
| 255 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, |
| 256 | int mode, struct nameidata *nd) |
| 257 | { |
| 258 | int rc; |
| 259 | |
| 260 | rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); |
| 261 | if (unlikely(rc)) { |
| 262 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" |
| 263 | "lower filesystem\n"); |
| 264 | goto out; |
| 265 | } |
| 266 | /* At this point, a file exists on "disk"; we need to make sure |
| 267 | * that this on disk file is prepared to be an ecryptfs file */ |
| 268 | rc = ecryptfs_initialize_file(ecryptfs_dentry); |
| 269 | out: |
| 270 | return rc; |
| 271 | } |
| 272 | |
| 273 | /** |
| 274 | * ecryptfs_lookup |
| 275 | * @dir: inode |
| 276 | * @dentry: The dentry |
| 277 | * @nd: nameidata, may be NULL |
| 278 | * |
| 279 | * Find a file on disk. If the file does not exist, then we'll add it to the |
| 280 | * dentry cache and continue on to read it from the disk. |
| 281 | */ |
| 282 | static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry, |
| 283 | struct nameidata *nd) |
| 284 | { |
| 285 | int rc = 0; |
| 286 | struct dentry *lower_dir_dentry; |
| 287 | struct dentry *lower_dentry; |
| 288 | struct vfsmount *lower_mnt; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 289 | char *encoded_name; |
| 290 | unsigned int encoded_namelen; |
| 291 | struct ecryptfs_crypt_stat *crypt_stat = NULL; |
| 292 | char *page_virt = NULL; |
| 293 | struct inode *lower_inode; |
| 294 | u64 file_size; |
| 295 | |
| 296 | lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); |
| 297 | dentry->d_op = &ecryptfs_dops; |
| 298 | if ((dentry->d_name.len == 1 && !strcmp(dentry->d_name.name, ".")) |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 299 | || (dentry->d_name.len == 2 |
| 300 | && !strcmp(dentry->d_name.name, ".."))) { |
| 301 | d_drop(dentry); |
| 302 | goto out; |
| 303 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 304 | encoded_namelen = ecryptfs_encode_filename(crypt_stat, |
| 305 | dentry->d_name.name, |
| 306 | dentry->d_name.len, |
| 307 | &encoded_name); |
| 308 | if (encoded_namelen < 0) { |
| 309 | rc = encoded_namelen; |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 310 | d_drop(dentry); |
| 311 | goto out; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 312 | } |
| 313 | ecryptfs_printk(KERN_DEBUG, "encoded_name = [%s]; encoded_namelen " |
| 314 | "= [%d]\n", encoded_name, encoded_namelen); |
| 315 | lower_dentry = lookup_one_len(encoded_name, lower_dir_dentry, |
| 316 | encoded_namelen - 1); |
| 317 | kfree(encoded_name); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 318 | if (IS_ERR(lower_dentry)) { |
| 319 | ecryptfs_printk(KERN_ERR, "ERR from lower_dentry\n"); |
| 320 | rc = PTR_ERR(lower_dentry); |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 321 | d_drop(dentry); |
| 322 | goto out; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 323 | } |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 324 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 325 | ecryptfs_printk(KERN_DEBUG, "lower_dentry = [%p]; lower_dentry->" |
| 326 | "d_name.name = [%s]\n", lower_dentry, |
| 327 | lower_dentry->d_name.name); |
| 328 | lower_inode = lower_dentry->d_inode; |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 329 | fsstack_copy_attr_atime(dir, lower_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 330 | BUG_ON(!atomic_read(&lower_dentry->d_count)); |
| 331 | ecryptfs_set_dentry_private(dentry, |
| 332 | kmem_cache_alloc(ecryptfs_dentry_info_cache, |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 333 | GFP_KERNEL)); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 334 | if (!ecryptfs_dentry_to_private(dentry)) { |
| 335 | rc = -ENOMEM; |
| 336 | ecryptfs_printk(KERN_ERR, "Out of memory whilst attempting " |
| 337 | "to allocate ecryptfs_dentry_info struct\n"); |
| 338 | goto out_dput; |
| 339 | } |
| 340 | ecryptfs_set_dentry_lower(dentry, lower_dentry); |
| 341 | ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt); |
| 342 | if (!lower_dentry->d_inode) { |
| 343 | /* We want to add because we couldn't find in lower */ |
| 344 | d_add(dentry, NULL); |
| 345 | goto out; |
| 346 | } |
| 347 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 1); |
| 348 | if (rc) { |
| 349 | ecryptfs_printk(KERN_ERR, "Error interposing\n"); |
| 350 | goto out_dput; |
| 351 | } |
| 352 | if (S_ISDIR(lower_inode->i_mode)) { |
| 353 | ecryptfs_printk(KERN_DEBUG, "Is a directory; returning\n"); |
| 354 | goto out; |
| 355 | } |
| 356 | if (S_ISLNK(lower_inode->i_mode)) { |
| 357 | ecryptfs_printk(KERN_DEBUG, "Is a symlink; returning\n"); |
| 358 | goto out; |
| 359 | } |
| 360 | if (!nd) { |
| 361 | ecryptfs_printk(KERN_DEBUG, "We have a NULL nd, just leave" |
| 362 | "as we *think* we are about to unlink\n"); |
| 363 | goto out; |
| 364 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 365 | /* Released in this function */ |
Robert P. J. Day | c376222 | 2007-02-10 01:45:03 -0800 | [diff] [blame] | 366 | page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame^] | 367 | GFP_USER); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 368 | if (!page_virt) { |
| 369 | rc = -ENOMEM; |
| 370 | ecryptfs_printk(KERN_ERR, |
| 371 | "Cannot ecryptfs_kmalloc a page\n"); |
| 372 | goto out_dput; |
| 373 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 374 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
| 375 | if (!ECRYPTFS_CHECK_FLAG(crypt_stat->flags, ECRYPTFS_POLICY_APPLIED)) |
| 376 | ecryptfs_set_default_sizes(crypt_stat); |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame^] | 377 | rc = ecryptfs_read_and_validate_header_region(page_virt, lower_dentry, |
| 378 | nd->mnt); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 379 | if (rc) { |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame^] | 380 | rc = ecryptfs_read_and_validate_xattr_region(page_virt, dentry); |
| 381 | if (rc) { |
| 382 | printk(KERN_DEBUG "Valid metadata not found in header " |
| 383 | "region or xattr region; treating file as " |
| 384 | "unencrypted\n"); |
| 385 | rc = 0; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 386 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); |
| 387 | goto out; |
| 388 | } |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame^] | 389 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 390 | } |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame^] | 391 | memcpy(&file_size, page_virt, sizeof(file_size)); |
| 392 | file_size = be64_to_cpu(file_size); |
| 393 | i_size_write(dentry->d_inode, (loff_t)file_size); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 394 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); |
| 395 | goto out; |
| 396 | |
| 397 | out_dput: |
| 398 | dput(lower_dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 399 | d_drop(dentry); |
| 400 | out: |
| 401 | return ERR_PTR(rc); |
| 402 | } |
| 403 | |
| 404 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, |
| 405 | struct dentry *new_dentry) |
| 406 | { |
| 407 | struct dentry *lower_old_dentry; |
| 408 | struct dentry *lower_new_dentry; |
| 409 | struct dentry *lower_dir_dentry; |
| 410 | u64 file_size_save; |
| 411 | int rc; |
| 412 | |
| 413 | file_size_save = i_size_read(old_dentry->d_inode); |
| 414 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
| 415 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); |
| 416 | dget(lower_old_dentry); |
| 417 | dget(lower_new_dentry); |
| 418 | lower_dir_dentry = lock_parent(lower_new_dentry); |
| 419 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, |
| 420 | lower_new_dentry); |
| 421 | if (rc || !lower_new_dentry->d_inode) |
| 422 | goto out_lock; |
| 423 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); |
| 424 | if (rc) |
| 425 | goto out_lock; |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 426 | fsstack_copy_attr_times(dir, lower_new_dentry->d_inode); |
| 427 | fsstack_copy_inode_size(dir, lower_new_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 428 | old_dentry->d_inode->i_nlink = |
| 429 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; |
| 430 | i_size_write(new_dentry->d_inode, file_size_save); |
| 431 | out_lock: |
| 432 | unlock_dir(lower_dir_dentry); |
| 433 | dput(lower_new_dentry); |
| 434 | dput(lower_old_dentry); |
Michael Halcrow | ae56fb1 | 2006-11-16 01:19:30 -0800 | [diff] [blame] | 435 | d_drop(lower_old_dentry); |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 436 | d_drop(new_dentry); |
| 437 | d_drop(old_dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 438 | return rc; |
| 439 | } |
| 440 | |
| 441 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) |
| 442 | { |
| 443 | int rc = 0; |
| 444 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 445 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); |
| 446 | |
| 447 | lock_parent(lower_dentry); |
| 448 | rc = vfs_unlink(lower_dir_inode, lower_dentry); |
| 449 | if (rc) { |
Michael Halcrow | ae56fb1 | 2006-11-16 01:19:30 -0800 | [diff] [blame] | 450 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 451 | goto out_unlock; |
| 452 | } |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 453 | fsstack_copy_attr_times(dir, lower_dir_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 454 | dentry->d_inode->i_nlink = |
| 455 | ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; |
| 456 | dentry->d_inode->i_ctime = dir->i_ctime; |
| 457 | out_unlock: |
| 458 | unlock_parent(lower_dentry); |
| 459 | return rc; |
| 460 | } |
| 461 | |
| 462 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, |
| 463 | const char *symname) |
| 464 | { |
| 465 | int rc; |
| 466 | struct dentry *lower_dentry; |
| 467 | struct dentry *lower_dir_dentry; |
| 468 | umode_t mode; |
| 469 | char *encoded_symname; |
| 470 | unsigned int encoded_symlen; |
| 471 | struct ecryptfs_crypt_stat *crypt_stat = NULL; |
| 472 | |
| 473 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 474 | dget(lower_dentry); |
| 475 | lower_dir_dentry = lock_parent(lower_dentry); |
| 476 | mode = S_IALLUGO; |
| 477 | encoded_symlen = ecryptfs_encode_filename(crypt_stat, symname, |
| 478 | strlen(symname), |
| 479 | &encoded_symname); |
| 480 | if (encoded_symlen < 0) { |
| 481 | rc = encoded_symlen; |
| 482 | goto out_lock; |
| 483 | } |
| 484 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, |
| 485 | encoded_symname, mode); |
| 486 | kfree(encoded_symname); |
| 487 | if (rc || !lower_dentry->d_inode) |
| 488 | goto out_lock; |
| 489 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); |
| 490 | if (rc) |
| 491 | goto out_lock; |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 492 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
| 493 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 494 | out_lock: |
| 495 | unlock_dir(lower_dir_dentry); |
| 496 | dput(lower_dentry); |
| 497 | if (!dentry->d_inode) |
| 498 | d_drop(dentry); |
| 499 | return rc; |
| 500 | } |
| 501 | |
| 502 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| 503 | { |
| 504 | int rc; |
| 505 | struct dentry *lower_dentry; |
| 506 | struct dentry *lower_dir_dentry; |
| 507 | |
| 508 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 509 | lower_dir_dentry = lock_parent(lower_dentry); |
| 510 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); |
| 511 | if (rc || !lower_dentry->d_inode) |
| 512 | goto out; |
| 513 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); |
| 514 | if (rc) |
| 515 | goto out; |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 516 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
| 517 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 518 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
| 519 | out: |
| 520 | unlock_dir(lower_dir_dentry); |
| 521 | if (!dentry->d_inode) |
| 522 | d_drop(dentry); |
| 523 | return rc; |
| 524 | } |
| 525 | |
| 526 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) |
| 527 | { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 528 | struct dentry *lower_dentry; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 529 | struct dentry *lower_dir_dentry; |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 530 | int rc; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 531 | |
| 532 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 533 | dget(dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 534 | lower_dir_dentry = lock_parent(lower_dentry); |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 535 | dget(lower_dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 536 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 537 | dput(lower_dentry); |
| 538 | if (!rc) |
| 539 | d_delete(lower_dentry); |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 540 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 541 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
| 542 | unlock_dir(lower_dir_dentry); |
| 543 | if (!rc) |
| 544 | d_drop(dentry); |
Michael Halcrow | 45ec4aba | 2006-10-30 22:07:20 -0800 | [diff] [blame] | 545 | dput(dentry); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 546 | return rc; |
| 547 | } |
| 548 | |
| 549 | static int |
| 550 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) |
| 551 | { |
| 552 | int rc; |
| 553 | struct dentry *lower_dentry; |
| 554 | struct dentry *lower_dir_dentry; |
| 555 | |
| 556 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 557 | lower_dir_dentry = lock_parent(lower_dentry); |
| 558 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); |
| 559 | if (rc || !lower_dentry->d_inode) |
| 560 | goto out; |
| 561 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); |
| 562 | if (rc) |
| 563 | goto out; |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 564 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
| 565 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 566 | out: |
| 567 | unlock_dir(lower_dir_dentry); |
| 568 | if (!dentry->d_inode) |
| 569 | d_drop(dentry); |
| 570 | return rc; |
| 571 | } |
| 572 | |
| 573 | static int |
| 574 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 575 | struct inode *new_dir, struct dentry *new_dentry) |
| 576 | { |
| 577 | int rc; |
| 578 | struct dentry *lower_old_dentry; |
| 579 | struct dentry *lower_new_dentry; |
| 580 | struct dentry *lower_old_dir_dentry; |
| 581 | struct dentry *lower_new_dir_dentry; |
| 582 | |
| 583 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
| 584 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); |
| 585 | dget(lower_old_dentry); |
| 586 | dget(lower_new_dentry); |
| 587 | lower_old_dir_dentry = dget_parent(lower_old_dentry); |
| 588 | lower_new_dir_dentry = dget_parent(lower_new_dentry); |
| 589 | lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
| 590 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, |
| 591 | lower_new_dir_dentry->d_inode, lower_new_dentry); |
| 592 | if (rc) |
| 593 | goto out_lock; |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 594 | fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode, NULL); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 595 | if (new_dir != old_dir) |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 596 | fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode, NULL); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 597 | out_lock: |
| 598 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
Michael Halcrow | a908308 | 2006-11-16 01:19:16 -0800 | [diff] [blame] | 599 | dput(lower_new_dentry->d_parent); |
| 600 | dput(lower_old_dentry->d_parent); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 601 | dput(lower_new_dentry); |
| 602 | dput(lower_old_dentry); |
| 603 | return rc; |
| 604 | } |
| 605 | |
| 606 | static int |
| 607 | ecryptfs_readlink(struct dentry *dentry, char __user * buf, int bufsiz) |
| 608 | { |
| 609 | int rc; |
| 610 | struct dentry *lower_dentry; |
| 611 | char *decoded_name; |
| 612 | char *lower_buf; |
| 613 | mm_segment_t old_fs; |
| 614 | struct ecryptfs_crypt_stat *crypt_stat; |
| 615 | |
| 616 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 617 | if (!lower_dentry->d_inode->i_op || |
| 618 | !lower_dentry->d_inode->i_op->readlink) { |
| 619 | rc = -EINVAL; |
| 620 | goto out; |
| 621 | } |
| 622 | /* Released in this function */ |
| 623 | lower_buf = kmalloc(bufsiz, GFP_KERNEL); |
| 624 | if (lower_buf == NULL) { |
| 625 | ecryptfs_printk(KERN_ERR, "Out of memory\n"); |
| 626 | rc = -ENOMEM; |
| 627 | goto out; |
| 628 | } |
| 629 | old_fs = get_fs(); |
| 630 | set_fs(get_ds()); |
| 631 | ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " |
| 632 | "lower_dentry->d_name.name = [%s]\n", |
| 633 | lower_dentry->d_name.name); |
| 634 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, |
| 635 | (char __user *)lower_buf, |
| 636 | bufsiz); |
| 637 | set_fs(old_fs); |
| 638 | if (rc >= 0) { |
| 639 | crypt_stat = NULL; |
| 640 | rc = ecryptfs_decode_filename(crypt_stat, lower_buf, rc, |
| 641 | &decoded_name); |
| 642 | if (rc == -ENOMEM) |
| 643 | goto out_free_lower_buf; |
| 644 | if (rc > 0) { |
| 645 | ecryptfs_printk(KERN_DEBUG, "Copying [%d] bytes " |
| 646 | "to userspace: [%*s]\n", rc, |
| 647 | decoded_name); |
| 648 | if (copy_to_user(buf, decoded_name, rc)) |
| 649 | rc = -EFAULT; |
| 650 | } |
| 651 | kfree(decoded_name); |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 652 | fsstack_copy_attr_atime(dentry->d_inode, |
| 653 | lower_dentry->d_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 654 | } |
| 655 | out_free_lower_buf: |
| 656 | kfree(lower_buf); |
| 657 | out: |
| 658 | return rc; |
| 659 | } |
| 660 | |
| 661 | static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) |
| 662 | { |
| 663 | char *buf; |
| 664 | int len = PAGE_SIZE, rc; |
| 665 | mm_segment_t old_fs; |
| 666 | |
| 667 | /* Released in ecryptfs_put_link(); only release here on error */ |
| 668 | buf = kmalloc(len, GFP_KERNEL); |
| 669 | if (!buf) { |
| 670 | rc = -ENOMEM; |
| 671 | goto out; |
| 672 | } |
| 673 | old_fs = get_fs(); |
| 674 | set_fs(get_ds()); |
| 675 | ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ " |
| 676 | "dentry->d_name.name = [%s]\n", dentry->d_name.name); |
| 677 | rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); |
| 678 | buf[rc] = '\0'; |
| 679 | set_fs(old_fs); |
| 680 | if (rc < 0) |
| 681 | goto out_free; |
| 682 | rc = 0; |
| 683 | nd_set_link(nd, buf); |
| 684 | goto out; |
| 685 | out_free: |
| 686 | kfree(buf); |
| 687 | out: |
| 688 | return ERR_PTR(rc); |
| 689 | } |
| 690 | |
| 691 | static void |
| 692 | ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) |
| 693 | { |
| 694 | /* Free the char* */ |
| 695 | kfree(nd_get_link(nd)); |
| 696 | } |
| 697 | |
| 698 | /** |
| 699 | * upper_size_to_lower_size |
| 700 | * @crypt_stat: Crypt_stat associated with file |
| 701 | * @upper_size: Size of the upper file |
| 702 | * |
| 703 | * Calculate the requried size of the lower file based on the |
| 704 | * specified size of the upper file. This calculation is based on the |
| 705 | * number of headers in the underlying file and the extent size. |
| 706 | * |
| 707 | * Returns Calculated size of the lower file. |
| 708 | */ |
| 709 | static loff_t |
| 710 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, |
| 711 | loff_t upper_size) |
| 712 | { |
| 713 | loff_t lower_size; |
| 714 | |
| 715 | lower_size = ( crypt_stat->header_extent_size |
| 716 | * crypt_stat->num_header_extents_at_front ); |
| 717 | if (upper_size != 0) { |
| 718 | loff_t num_extents; |
| 719 | |
| 720 | num_extents = upper_size >> crypt_stat->extent_shift; |
| 721 | if (upper_size & ~crypt_stat->extent_mask) |
| 722 | num_extents++; |
| 723 | lower_size += (num_extents * crypt_stat->extent_size); |
| 724 | } |
| 725 | return lower_size; |
| 726 | } |
| 727 | |
| 728 | /** |
| 729 | * ecryptfs_truncate |
| 730 | * @dentry: The ecryptfs layer dentry |
| 731 | * @new_length: The length to expand the file to |
| 732 | * |
| 733 | * Function to handle truncations modifying the size of the file. Note |
| 734 | * that the file sizes are interpolated. When expanding, we are simply |
| 735 | * writing strings of 0's out. When truncating, we need to modify the |
| 736 | * underlying file size according to the page index interpolations. |
| 737 | * |
| 738 | * Returns zero on success; non-zero otherwise |
| 739 | */ |
| 740 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) |
| 741 | { |
| 742 | int rc = 0; |
| 743 | struct inode *inode = dentry->d_inode; |
| 744 | struct dentry *lower_dentry; |
| 745 | struct vfsmount *lower_mnt; |
| 746 | struct file fake_ecryptfs_file, *lower_file = NULL; |
| 747 | struct ecryptfs_crypt_stat *crypt_stat; |
| 748 | loff_t i_size = i_size_read(inode); |
| 749 | loff_t lower_size_before_truncate; |
| 750 | loff_t lower_size_after_truncate; |
| 751 | |
| 752 | if (unlikely((new_length == i_size))) |
| 753 | goto out; |
| 754 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
| 755 | /* Set up a fake ecryptfs file, this is used to interface with |
| 756 | * the file in the underlying filesystem so that the |
| 757 | * truncation has an effect there as well. */ |
| 758 | memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file)); |
Josef "Jeff" Sipek | bd243a4 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 759 | fake_ecryptfs_file.f_path.dentry = dentry; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 760 | /* Released at out_free: label */ |
| 761 | ecryptfs_set_file_private(&fake_ecryptfs_file, |
| 762 | kmem_cache_alloc(ecryptfs_file_info_cache, |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 763 | GFP_KERNEL)); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 764 | if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) { |
| 765 | rc = -ENOMEM; |
| 766 | goto out; |
| 767 | } |
| 768 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 769 | /* This dget & mntget is released through fput at out_fput: */ |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 770 | lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); |
Michael Halcrow | 7ff1d74 | 2006-10-30 22:07:19 -0800 | [diff] [blame] | 771 | if ((rc = ecryptfs_open_lower_file(&lower_file, lower_dentry, lower_mnt, |
| 772 | O_RDWR))) { |
| 773 | ecryptfs_printk(KERN_ERR, |
| 774 | "Error opening dentry; rc = [%i]\n", rc); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 775 | goto out_free; |
| 776 | } |
| 777 | ecryptfs_set_file_lower(&fake_ecryptfs_file, lower_file); |
| 778 | /* Switch on growing or shrinking file */ |
| 779 | if (new_length > i_size) { |
| 780 | rc = ecryptfs_fill_zeros(&fake_ecryptfs_file, new_length); |
| 781 | if (rc) { |
| 782 | ecryptfs_printk(KERN_ERR, |
| 783 | "Problem with fill_zeros\n"); |
| 784 | goto out_fput; |
| 785 | } |
| 786 | i_size_write(inode, new_length); |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame^] | 787 | rc = ecryptfs_write_inode_size_to_metadata( |
| 788 | lower_file, lower_dentry->d_inode, inode, dentry, |
| 789 | ECRYPTFS_LOWER_I_MUTEX_NOT_HELD); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 790 | if (rc) { |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame^] | 791 | printk(KERN_ERR "Problem with " |
| 792 | "ecryptfs_write_inode_size_to_metadata; " |
| 793 | "rc = [%d]\n", rc); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 794 | goto out_fput; |
| 795 | } |
| 796 | } else { /* new_length < i_size_read(inode) */ |
| 797 | vmtruncate(inode, new_length); |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame^] | 798 | rc = ecryptfs_write_inode_size_to_metadata( |
| 799 | lower_file, lower_dentry->d_inode, inode, dentry, |
| 800 | ECRYPTFS_LOWER_I_MUTEX_NOT_HELD); |
| 801 | if (rc) { |
| 802 | printk(KERN_ERR "Problem with " |
| 803 | "ecryptfs_write_inode_size_to_metadata; " |
| 804 | "rc = [%d]\n", rc); |
| 805 | goto out_fput; |
| 806 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 807 | /* We are reducing the size of the ecryptfs file, and need to |
| 808 | * know if we need to reduce the size of the lower file. */ |
| 809 | lower_size_before_truncate = |
| 810 | upper_size_to_lower_size(crypt_stat, i_size); |
| 811 | lower_size_after_truncate = |
| 812 | upper_size_to_lower_size(crypt_stat, new_length); |
| 813 | if (lower_size_after_truncate < lower_size_before_truncate) |
| 814 | vmtruncate(lower_dentry->d_inode, |
| 815 | lower_size_after_truncate); |
| 816 | } |
| 817 | /* Update the access times */ |
| 818 | lower_dentry->d_inode->i_mtime = lower_dentry->d_inode->i_ctime |
| 819 | = CURRENT_TIME; |
| 820 | mark_inode_dirty_sync(inode); |
| 821 | out_fput: |
Michael Halcrow | 7ff1d74 | 2006-10-30 22:07:19 -0800 | [diff] [blame] | 822 | if ((rc = ecryptfs_close_lower_file(lower_file))) |
| 823 | printk(KERN_ERR "Error closing lower_file\n"); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 824 | out_free: |
| 825 | if (ecryptfs_file_to_private(&fake_ecryptfs_file)) |
| 826 | kmem_cache_free(ecryptfs_file_info_cache, |
| 827 | ecryptfs_file_to_private(&fake_ecryptfs_file)); |
| 828 | out: |
| 829 | return rc; |
| 830 | } |
| 831 | |
| 832 | static int |
| 833 | ecryptfs_permission(struct inode *inode, int mask, struct nameidata *nd) |
| 834 | { |
| 835 | int rc; |
| 836 | |
| 837 | if (nd) { |
| 838 | struct vfsmount *vfsmnt_save = nd->mnt; |
| 839 | struct dentry *dentry_save = nd->dentry; |
| 840 | |
| 841 | nd->mnt = ecryptfs_dentry_to_lower_mnt(nd->dentry); |
| 842 | nd->dentry = ecryptfs_dentry_to_lower(nd->dentry); |
| 843 | rc = permission(ecryptfs_inode_to_lower(inode), mask, nd); |
| 844 | nd->mnt = vfsmnt_save; |
| 845 | nd->dentry = dentry_save; |
| 846 | } else |
| 847 | rc = permission(ecryptfs_inode_to_lower(inode), mask, NULL); |
| 848 | return rc; |
| 849 | } |
| 850 | |
| 851 | /** |
| 852 | * ecryptfs_setattr |
| 853 | * @dentry: dentry handle to the inode to modify |
| 854 | * @ia: Structure with flags of what to change and values |
| 855 | * |
| 856 | * Updates the metadata of an inode. If the update is to the size |
| 857 | * i.e. truncation, then ecryptfs_truncate will handle the size modification |
| 858 | * of both the ecryptfs inode and the lower inode. |
| 859 | * |
| 860 | * All other metadata changes will be passed right to the lower filesystem, |
| 861 | * and we will just update our inode to look like the lower. |
| 862 | */ |
| 863 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) |
| 864 | { |
| 865 | int rc = 0; |
| 866 | struct dentry *lower_dentry; |
| 867 | struct inode *inode; |
| 868 | struct inode *lower_inode; |
| 869 | struct ecryptfs_crypt_stat *crypt_stat; |
| 870 | |
| 871 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
| 872 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 873 | inode = dentry->d_inode; |
| 874 | lower_inode = ecryptfs_inode_to_lower(inode); |
| 875 | if (ia->ia_valid & ATTR_SIZE) { |
| 876 | ecryptfs_printk(KERN_DEBUG, |
| 877 | "ia->ia_valid = [0x%x] ATTR_SIZE" " = [0x%x]\n", |
| 878 | ia->ia_valid, ATTR_SIZE); |
| 879 | rc = ecryptfs_truncate(dentry, ia->ia_size); |
| 880 | /* ecryptfs_truncate handles resizing of the lower file */ |
| 881 | ia->ia_valid &= ~ATTR_SIZE; |
| 882 | ecryptfs_printk(KERN_DEBUG, "ia->ia_valid = [%x]\n", |
| 883 | ia->ia_valid); |
| 884 | if (rc < 0) |
| 885 | goto out; |
| 886 | } |
| 887 | rc = notify_change(lower_dentry, ia); |
| 888 | out: |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 889 | fsstack_copy_attr_all(inode, lower_inode, NULL); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 890 | return rc; |
| 891 | } |
| 892 | |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame^] | 893 | int |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 894 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
| 895 | size_t size, int flags) |
| 896 | { |
| 897 | int rc = 0; |
| 898 | struct dentry *lower_dentry; |
| 899 | |
| 900 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 901 | if (!lower_dentry->d_inode->i_op->setxattr) { |
| 902 | rc = -ENOSYS; |
| 903 | goto out; |
| 904 | } |
| 905 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
| 906 | rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value, |
| 907 | size, flags); |
| 908 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
| 909 | out: |
| 910 | return rc; |
| 911 | } |
| 912 | |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame^] | 913 | ssize_t |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 914 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
| 915 | size_t size) |
| 916 | { |
| 917 | int rc = 0; |
| 918 | struct dentry *lower_dentry; |
| 919 | |
| 920 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 921 | if (!lower_dentry->d_inode->i_op->getxattr) { |
| 922 | rc = -ENOSYS; |
| 923 | goto out; |
| 924 | } |
| 925 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
| 926 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, |
| 927 | size); |
| 928 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
| 929 | out: |
| 930 | return rc; |
| 931 | } |
| 932 | |
| 933 | static ssize_t |
| 934 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) |
| 935 | { |
| 936 | int rc = 0; |
| 937 | struct dentry *lower_dentry; |
| 938 | |
| 939 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 940 | if (!lower_dentry->d_inode->i_op->listxattr) { |
| 941 | rc = -ENOSYS; |
| 942 | goto out; |
| 943 | } |
| 944 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
| 945 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); |
| 946 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
| 947 | out: |
| 948 | return rc; |
| 949 | } |
| 950 | |
| 951 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) |
| 952 | { |
| 953 | int rc = 0; |
| 954 | struct dentry *lower_dentry; |
| 955 | |
| 956 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 957 | if (!lower_dentry->d_inode->i_op->removexattr) { |
| 958 | rc = -ENOSYS; |
| 959 | goto out; |
| 960 | } |
| 961 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
| 962 | rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); |
| 963 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
| 964 | out: |
| 965 | return rc; |
| 966 | } |
| 967 | |
| 968 | int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) |
| 969 | { |
| 970 | if ((ecryptfs_inode_to_lower(inode) |
| 971 | == (struct inode *)candidate_lower_inode)) |
| 972 | return 1; |
| 973 | else |
| 974 | return 0; |
| 975 | } |
| 976 | |
| 977 | int ecryptfs_inode_set(struct inode *inode, void *lower_inode) |
| 978 | { |
| 979 | ecryptfs_init_inode(inode, (struct inode *)lower_inode); |
| 980 | return 0; |
| 981 | } |
| 982 | |
| 983 | struct inode_operations ecryptfs_symlink_iops = { |
| 984 | .readlink = ecryptfs_readlink, |
| 985 | .follow_link = ecryptfs_follow_link, |
| 986 | .put_link = ecryptfs_put_link, |
| 987 | .permission = ecryptfs_permission, |
| 988 | .setattr = ecryptfs_setattr, |
| 989 | .setxattr = ecryptfs_setxattr, |
| 990 | .getxattr = ecryptfs_getxattr, |
| 991 | .listxattr = ecryptfs_listxattr, |
| 992 | .removexattr = ecryptfs_removexattr |
| 993 | }; |
| 994 | |
| 995 | struct inode_operations ecryptfs_dir_iops = { |
| 996 | .create = ecryptfs_create, |
| 997 | .lookup = ecryptfs_lookup, |
| 998 | .link = ecryptfs_link, |
| 999 | .unlink = ecryptfs_unlink, |
| 1000 | .symlink = ecryptfs_symlink, |
| 1001 | .mkdir = ecryptfs_mkdir, |
| 1002 | .rmdir = ecryptfs_rmdir, |
| 1003 | .mknod = ecryptfs_mknod, |
| 1004 | .rename = ecryptfs_rename, |
| 1005 | .permission = ecryptfs_permission, |
| 1006 | .setattr = ecryptfs_setattr, |
| 1007 | .setxattr = ecryptfs_setxattr, |
| 1008 | .getxattr = ecryptfs_getxattr, |
| 1009 | .listxattr = ecryptfs_listxattr, |
| 1010 | .removexattr = ecryptfs_removexattr |
| 1011 | }; |
| 1012 | |
| 1013 | struct inode_operations ecryptfs_main_iops = { |
| 1014 | .permission = ecryptfs_permission, |
| 1015 | .setattr = ecryptfs_setattr, |
| 1016 | .setxattr = ecryptfs_setxattr, |
| 1017 | .getxattr = ecryptfs_getxattr, |
| 1018 | .listxattr = ecryptfs_listxattr, |
| 1019 | .removexattr = ecryptfs_removexattr |
| 1020 | }; |