file.c (9a64e8e0ace51b309fdcff4b4754b3649250382a) file.c (e3ccaa9761200952cc269b1f4b7d7bb77a5e071b)
1/**
2 * eCryptfs: Linux filesystem encryption layer
3 *
4 * Copyright (C) 1997-2004 Erez Zadok
5 * Copyright (C) 2001-2004 Stony Brook University
6 * Copyright (C) 2004-2007 International Business Machines Corp.
7 * Author(s): Michael A. Halcrow <mhalcrow@us.ibm.com>
8 * Michael C. Thompson <mcthomps@us.ibm.com>

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156 if (!rc)
157 vma->vm_ops = &ecryptfs_file_vm_ops;
158
159 return rc;
160}
161
162struct kmem_cache *ecryptfs_file_info_cache;
163
1/**
2 * eCryptfs: Linux filesystem encryption layer
3 *
4 * Copyright (C) 1997-2004 Erez Zadok
5 * Copyright (C) 2001-2004 Stony Brook University
6 * Copyright (C) 2004-2007 International Business Machines Corp.
7 * Author(s): Michael A. Halcrow <mhalcrow@us.ibm.com>
8 * Michael C. Thompson <mcthomps@us.ibm.com>

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156 if (!rc)
157 vma->vm_ops = &ecryptfs_file_vm_ops;
158
159 return rc;
160}
161
162struct kmem_cache *ecryptfs_file_info_cache;
163
164static int read_or_initialize_metadata(struct dentry *dentry)
165{
166 struct inode *inode = dentry->d_inode;
167 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
168 struct ecryptfs_crypt_stat *crypt_stat;
169 int rc;
170
171 crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
172 mount_crypt_stat = &ecryptfs_superblock_to_private(
173 inode->i_sb)->mount_crypt_stat;
174 mutex_lock(&crypt_stat->cs_mutex);
175
176 if (crypt_stat->flags & ECRYPTFS_POLICY_APPLIED &&
177 crypt_stat->flags & ECRYPTFS_KEY_VALID) {
178 rc = 0;
179 goto out;
180 }
181
182 rc = ecryptfs_read_metadata(dentry);
183 if (!rc)
184 goto out;
185
186 if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED) {
187 crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
188 | ECRYPTFS_ENCRYPTED);
189 rc = 0;
190 goto out;
191 }
192
193 if (!(mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED) &&
194 !i_size_read(ecryptfs_inode_to_lower(inode))) {
195 rc = ecryptfs_initialize_file(dentry, inode);
196 if (!rc)
197 goto out;
198 }
199
200 rc = -EIO;
201out:
202 mutex_unlock(&crypt_stat->cs_mutex);
203 return rc;
204}
205
164/**
165 * ecryptfs_open
166 * @inode: inode speciying file to open
167 * @file: Structure to return filled in
168 *
169 * Opens the file specified by inode.
170 *
171 * Returns zero on success; non-zero otherwise

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231 if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
232 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
233 mutex_lock(&crypt_stat->cs_mutex);
234 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
235 mutex_unlock(&crypt_stat->cs_mutex);
236 rc = 0;
237 goto out;
238 }
206/**
207 * ecryptfs_open
208 * @inode: inode speciying file to open
209 * @file: Structure to return filled in
210 *
211 * Opens the file specified by inode.
212 *
213 * Returns zero on success; non-zero otherwise

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273 if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
274 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
275 mutex_lock(&crypt_stat->cs_mutex);
276 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
277 mutex_unlock(&crypt_stat->cs_mutex);
278 rc = 0;
279 goto out;
280 }
239 mutex_lock(&crypt_stat->cs_mutex);
240 if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
241 || !(crypt_stat->flags & ECRYPTFS_KEY_VALID)) {
242 rc = ecryptfs_read_metadata(ecryptfs_dentry);
243 if (rc) {
244 ecryptfs_printk(KERN_DEBUG,
245 "Valid headers not found\n");
246 if (!(mount_crypt_stat->flags
247 & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
248 rc = -EIO;
249 printk(KERN_WARNING "Either the lower file "
250 "is not in a valid eCryptfs format, "
251 "or the key could not be retrieved. "
252 "Plaintext passthrough mode is not "
253 "enabled; returning -EIO\n");
254 mutex_unlock(&crypt_stat->cs_mutex);
255 goto out_put;
256 }
257 rc = 0;
258 crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
259 | ECRYPTFS_ENCRYPTED);
260 mutex_unlock(&crypt_stat->cs_mutex);
261 goto out;
262 }
263 }
264 mutex_unlock(&crypt_stat->cs_mutex);
281 rc = read_or_initialize_metadata(ecryptfs_dentry);
282 if (rc)
283 goto out_put;
265 ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = "
266 "[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino,
267 (unsigned long long)i_size_read(inode));
268 goto out;
269out_put:
270 ecryptfs_put_lower_file(inode);
271out_free:
272 kmem_cache_free(ecryptfs_file_info_cache,

--- 107 unchanged lines hidden --- 		284 ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = "
285 "[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino,
286 (unsigned long long)i_size_read(inode));
287 goto out;
288out_put:
289 ecryptfs_put_lower_file(inode);
290out_free:
291 kmem_cache_free(ecryptfs_file_info_cache,

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